114981f170c2b41ba16092c9d5aa0dc991be2334
[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 <stdio.h>
14 #include <syslog.h>
15 #include <malloc.h>
16 #include <net/route.h>
17 #include <sys/mman.h>
18 #include <netdb.h>
19 #include <netinet/in.h>
20 #include <netinet/ip6.h>
21 #include <stdarg.h>
22 #include <stdlib.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 "dhcp6.h"
44 #include "l2tpns.h"
45 #include "cluster.h"
46 #include "plugin.h"
47 #include "ll.h"
48 #include "constants.h"
49 #include "control.h"
50 #include "util.h"
51 #include "tbf.h"
52
53 #ifdef BGP
54 #include "bgp.h"
55 #endif
56
57 #include "l2tplac.h"
58 #include "pppoe.h"
59 #include "dhcp6.h"
60
61 char * Vendor_name = "Linux L2TPNS";
62 uint32_t call_serial_number = 0;
63
64 // Globals
65 configt *config = NULL; // all configuration
66 int nlfd = -1; // netlink socket
67 int tunfd = -1; // tun interface file handle. (network device)
68 int udpfd[MAX_UDPFD + 1] = INIT_TABUDPFD; // array UDP file handle + 1 for lac udp
69 int udplacfd = -1; // UDP LAC file handle
70 int controlfd = -1; // Control signal handle
71 int clifd = -1; // Socket listening for CLI connections.
72 int daefd = -1; // Socket listening for DAE connections.
73 int snoopfd = -1; // UDP file handle for sending out intercept data
74 int *radfds = NULL; // RADIUS requests file handles
75 int rand_fd = -1; // Random data source
76 int cluster_sockfd = -1; // Intra-cluster communications socket.
77 int epollfd = -1; // event polling
78 time_t basetime = 0; // base clock
79 char hostname[MAXHOSTNAME] = ""; // us.
80 static int tunidx; // ifr_ifindex of tun device
81 int nlseqnum = 0; // netlink sequence number
82 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
83 static int syslog_log = 0; // are we logging to syslog
84 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
85 uint32_t last_id = 0; // Unique ID for radius accounting
86 // Guest change
87 char guest_users[10][32]; // Array of guest users
88 int guest_accounts_num = 0; // Number of guest users
89
90 // calculated from config->l2tp_mtu
91 uint16_t MRU = 0; // PPP MRU
92 uint16_t MSS = 0; // TCP MSS
93
94 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
95 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
96
97 union iphash {
98 sessionidt sess;
99 union iphash *idx;
100 } ip_hash[256]; // Mapping from IP address to session structures.
101
102 struct ipv6radix {
103 sessionidt sess;
104 struct ipv6radix *branch;
105 } ipv6_hash[16]; // Mapping from IPv6 address to session structures.
106
107 // Traffic counters.
108 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
109 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
110 uint32_t eth_tx = 0;
111
112 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
113 time_t time_now = 0; // Current time in seconds since epoch.
114 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
115 static char time_now_string[64] = {0}; // Current time as a string.
116 static int time_changed = 0; // time_now changed
117 char main_quit = 0; // True if we're in the process of exiting.
118 static char main_reload = 0; // Re-load pending
119 linked_list *loaded_plugins;
120 linked_list *plugins[MAX_PLUGIN_TYPES];
121
122 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
123 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
124
125 config_descriptt config_values[] = {
126 CONFIG("debug", debug, INT),
127 CONFIG("log_file", log_filename, STRING),
128 CONFIG("pid_file", pid_file, STRING),
129 CONFIG("random_device", random_device, STRING),
130 CONFIG("l2tp_secret", l2tp_secret, STRING),
131 CONFIG("l2tp_mtu", l2tp_mtu, INT),
132 CONFIG("ppp_restart_time", ppp_restart_time, INT),
133 CONFIG("ppp_max_configure", ppp_max_configure, INT),
134 CONFIG("ppp_max_failure", ppp_max_failure, INT),
135 CONFIG("primary_dns", default_dns1, IPv4),
136 CONFIG("secondary_dns", default_dns2, IPv4),
137 CONFIG("primary_radius", radiusserver[0], IPv4),
138 CONFIG("secondary_radius", radiusserver[1], IPv4),
139 CONFIG("primary_radius_port", radiusport[0], SHORT),
140 CONFIG("secondary_radius_port", radiusport[1], SHORT),
141 CONFIG("radius_accounting", radius_accounting, BOOL),
142 CONFIG("radius_interim", radius_interim, INT),
143 CONFIG("radius_secret", radiussecret, STRING),
144 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
145 CONFIG("radius_dae_port", radius_dae_port, SHORT),
146 CONFIG("radius_bind_min", radius_bind_min, SHORT),
147 CONFIG("radius_bind_max", radius_bind_max, SHORT),
148 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
149 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
150 CONFIG("guest_account", guest_user, STRING),
151 CONFIG("bind_address", bind_address, IPv4),
152 CONFIG("peer_address", peer_address, IPv4),
153 CONFIG("send_garp", send_garp, BOOL),
154 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
155 CONFIG("throttle_buckets", num_tbfs, INT),
156 CONFIG("accounting_dir", accounting_dir, STRING),
157 CONFIG("account_all_origin", account_all_origin, BOOL),
158 CONFIG("dump_speed", dump_speed, BOOL),
159 CONFIG("multi_read_count", multi_read_count, INT),
160 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
161 CONFIG("lock_pages", lock_pages, BOOL),
162 CONFIG("icmp_rate", icmp_rate, INT),
163 CONFIG("packet_limit", max_packets, INT),
164 CONFIG("cluster_address", cluster_address, IPv4),
165 CONFIG("cluster_interface", cluster_interface, STRING),
166 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
167 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
168 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
169 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
170 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
171 CONFIG("cli_bind_address", cli_bind_address, IPv4),
172 CONFIG("hostname", hostname, STRING),
173 #ifdef BGP
174 CONFIG("nexthop_address", nexthop_address, IPv4),
175 CONFIG("nexthop6_address", nexthop6_address, IPv6),
176 #endif
177 CONFIG("echo_timeout", echo_timeout, INT),
178 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
179 CONFIG("iftun_address", iftun_address, IPv4),
180 CONFIG("tundevicename", tundevicename, STRING),
181 CONFIG("disable_lac_func", disable_lac_func, BOOL),
182 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
183 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
184 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
185 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
186 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
187 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
188 CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
189 CONFIG("disable_no_spoof", disable_no_spoof, BOOL),
190 CONFIG("bind_multi_address", bind_multi_address, STRING),
191 CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name, BOOL),
192 CONFIG("multi_hostname", multi_hostname, STRING),
193 CONFIG("no_throttle_local_IP", no_throttle_local_IP, BOOL),
194 CONFIG("dhcp6_preferred_lifetime", dhcp6_preferred_lifetime, INT),
195 CONFIG("dhcp6_valid_lifetime", dhcp6_valid_lifetime, INT),
196 CONFIG("dhcp6_server_duid", dhcp6_server_duid, INT),
197 CONFIG("dns6_lifetime", dns6_lifetime, INT),
198 CONFIG("primary_ipv6_dns", default_ipv6_dns1, IPv6),
199 CONFIG("secondary_ipv6_dns", default_ipv6_dns2, IPv6),
200 CONFIG("default_ipv6_domain_list", default_ipv6_domain_list, STRING),
201 { NULL, 0, 0, 0 }
202 };
203
204 static char *plugin_functions[] = {
205 NULL,
206 "plugin_pre_auth",
207 "plugin_post_auth",
208 "plugin_timer",
209 "plugin_new_session",
210 "plugin_kill_session",
211 "plugin_control",
212 "plugin_radius_response",
213 "plugin_radius_reset",
214 "plugin_radius_account",
215 "plugin_become_master",
216 "plugin_new_session_master",
217 };
218
219 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
220
221 // Counters for shutdown sessions
222 static sessiont shut_acct[8192];
223 static sessionidt shut_acct_n = 0;
224
225 tunnelt *tunnel = NULL; // Array of tunnel structures.
226 bundlet *bundle = NULL; // Array of bundle structures.
227 fragmentationt *frag = NULL; // Array of fragmentation structures.
228 sessiont *session = NULL; // Array of session structures.
229 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
230 radiust *radius = NULL; // Array of radius structures.
231 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
232 ip_filtert *ip_filters = NULL; // Array of named filters.
233 static controlt *controlfree = 0;
234 struct Tstats *_statistics = NULL;
235 #ifdef RINGBUFFER
236 struct Tringbuffer *ringbuffer = NULL;
237 #endif
238
239 static ssize_t netlink_send(struct nlmsghdr *nh);
240 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
241 static void cache_ipmap(in_addr_t ip, sessionidt s);
242 static void uncache_ipmap(in_addr_t ip);
243 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
244 static void free_ip_address(sessionidt s);
245 static void dump_acct_info(int all);
246 static void sighup_handler(int sig);
247 static void shutdown_handler(int sig);
248 static void sigchild_handler(int sig);
249 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
250 static void update_config(void);
251 static void read_config_file(void);
252 static void initplugins(void);
253 static int add_plugin(char *plugin_name);
254 static int remove_plugin(char *plugin_name);
255 static void plugins_done(void);
256 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
257 static tunnelidt new_tunnel(void);
258 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
259 static void bundleclear(bundleidt b);
260
261 // return internal time (10ths since process startup), set f if given
262 // as a side-effect sets time_now, and time_changed
263 static clockt now(double *f)
264 {
265 struct timeval t;
266 gettimeofday(&t, 0);
267 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
268 if (t.tv_sec != time_now)
269 {
270 time_now = t.tv_sec;
271 time_changed++;
272 }
273
274 // Time in milliseconds
275 // TODO FOR MLPPP DEV
276 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
277
278 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
279 }
280
281 // work out a retry time based on try number
282 // This is a straight bounded exponential backoff.
283 // Maximum re-try time is 32 seconds. (2^5).
284 clockt backoff(uint8_t try)
285 {
286 if (try > 5) try = 5; // max backoff
287 return now(NULL) + 10 * (1 << try);
288 }
289
290
291 //
292 // Log a debug message. Typically called via the LOG macro
293 //
294 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
295 {
296 static char message[65536] = {0};
297 va_list ap;
298
299 #ifdef RINGBUFFER
300 if (ringbuffer)
301 {
302 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
303 ringbuffer->tail = 0;
304 if (ringbuffer->tail == ringbuffer->head)
305 if (++ringbuffer->head >= RINGBUFFER_SIZE)
306 ringbuffer->head = 0;
307
308 ringbuffer->buffer[ringbuffer->tail].level = level;
309 ringbuffer->buffer[ringbuffer->tail].session = s;
310 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
311 va_start(ap, format);
312 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
313 va_end(ap);
314 }
315 #endif
316
317 if (config->debug < level) return;
318
319 va_start(ap, format);
320 vsnprintf(message, sizeof(message), format, ap);
321
322 if (log_stream)
323 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
324 else if (syslog_log)
325 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
326
327 va_end(ap);
328 }
329
330 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
331 {
332 int i, j;
333 const uint8_t *d = data;
334
335 if (config->debug < level) return;
336
337 // No support for _log_hex to syslog
338 if (log_stream)
339 {
340 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
341 setvbuf(log_stream, NULL, _IOFBF, 16384);
342
343 for (i = 0; i < maxsize; )
344 {
345 fprintf(log_stream, "%4X: ", i);
346 for (j = i; j < maxsize && j < (i + 16); j++)
347 {
348 fprintf(log_stream, "%02X ", d[j]);
349 if (j == i + 7)
350 fputs(": ", log_stream);
351 }
352
353 for (; j < i + 16; j++)
354 {
355 fputs(" ", log_stream);
356 if (j == i + 7)
357 fputs(": ", log_stream);
358 }
359
360 fputs(" ", log_stream);
361 for (j = i; j < maxsize && j < (i + 16); j++)
362 {
363 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
364 fputc(d[j], log_stream);
365 else
366 fputc('.', log_stream);
367
368 if (j == i + 7)
369 fputs(" ", log_stream);
370 }
371
372 i = j;
373 fputs("\n", log_stream);
374 }
375
376 fflush(log_stream);
377 setbuf(log_stream, NULL);
378 }
379 }
380
381 // update a counter, accumulating 2^32 wraps
382 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
383 {
384 uint32_t new = *counter + delta;
385 if (new < *counter)
386 (*wrap)++;
387
388 *counter = new;
389 }
390
391 // initialise the random generator
392 static void initrandom(char *source)
393 {
394 static char path[sizeof(config->random_device)] = "*undefined*";
395
396 // reinitialise only if we are forced to do so or if the config has changed
397 if (source && !strncmp(path, source, sizeof(path)))
398 return;
399
400 // close previous source, if any
401 if (rand_fd >= 0)
402 close(rand_fd);
403
404 rand_fd = -1;
405
406 if (source)
407 {
408 // register changes
409 snprintf(path, sizeof(path), "%s", source);
410
411 if (*path == '/')
412 {
413 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
414 if (rand_fd < 0)
415 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
416 path, strerror(errno));
417 }
418 }
419 }
420
421 // fill buffer with random data
422 void random_data(uint8_t *buf, int len)
423 {
424 int n = 0;
425
426 CSTAT(random_data);
427 if (rand_fd >= 0)
428 {
429 n = read(rand_fd, buf, len);
430 if (n >= len) return;
431 if (n < 0)
432 {
433 if (errno != EAGAIN)
434 {
435 LOG(0, 0, 0, "Error reading from random source: %s\n",
436 strerror(errno));
437
438 // fall back to rand()
439 initrandom(NULL);
440 }
441
442 n = 0;
443 }
444 }
445
446 // append missing data
447 while (n < len)
448 // not using the low order bits from the prng stream
449 buf[n++] = (rand() >> 4) & 0xff;
450 }
451
452 // Add a route
453 //
454 // This adds it to the routing table, advertises it
455 // via BGP if enabled, and stuffs it into the
456 // 'sessionbyip' cache.
457 //
458 // 'ip' must be in _host_ order.
459 //
460 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
461 {
462 struct {
463 struct nlmsghdr nh;
464 struct rtmsg rt;
465 char buf[32];
466 } req;
467 int i;
468 in_addr_t n_ip;
469
470 if (!prefixlen) prefixlen = 32;
471
472 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
473
474 memset(&req, 0, sizeof(req));
475
476 if (add)
477 {
478 req.nh.nlmsg_type = RTM_NEWROUTE;
479 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
480 }
481 else
482 {
483 req.nh.nlmsg_type = RTM_DELROUTE;
484 req.nh.nlmsg_flags = NLM_F_REQUEST;
485 }
486
487 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
488
489 req.rt.rtm_family = AF_INET;
490 req.rt.rtm_dst_len = prefixlen;
491 req.rt.rtm_table = RT_TABLE_MAIN;
492 req.rt.rtm_protocol = 42;
493 req.rt.rtm_scope = RT_SCOPE_LINK;
494 req.rt.rtm_type = RTN_UNICAST;
495
496 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
497 n_ip = htonl(ip);
498 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
499 if (gw)
500 {
501 n_ip = htonl(gw);
502 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
503 }
504
505 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
506 fmtaddr(htonl(ip), 0), prefixlen,
507 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
508
509 if (netlink_send(&req.nh) < 0)
510 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
511
512 #ifdef BGP
513 if (add)
514 bgp_add_route(htonl(ip), prefixlen);
515 else
516 bgp_del_route(htonl(ip), prefixlen);
517 #endif /* BGP */
518
519 // Add/Remove the IPs to the 'sessionbyip' cache.
520 // Note that we add the zero address in the case of
521 // a network route. Roll on CIDR.
522
523 // Note that 's == 0' implies this is the address pool.
524 // We still cache it here, because it will pre-fill
525 // the malloc'ed tree.
526
527 if (s)
528 {
529 if (!add) // Are we deleting a route?
530 s = 0; // Caching the session as '0' is the same as uncaching.
531
532 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
533 cache_ipmap(i, s);
534 }
535 }
536
537 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
538 {
539 struct {
540 struct nlmsghdr nh;
541 struct rtmsg rt;
542 char buf[64];
543 } req;
544 int metric;
545 char ipv6addr[INET6_ADDRSTRLEN];
546
547 if (!config->ipv6_prefix.s6_addr[0])
548 {
549 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
550 return;
551 }
552
553 memset(&req, 0, sizeof(req));
554
555 if (add)
556 {
557 req.nh.nlmsg_type = RTM_NEWROUTE;
558 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
559 }
560 else
561 {
562 req.nh.nlmsg_type = RTM_DELROUTE;
563 req.nh.nlmsg_flags = NLM_F_REQUEST;
564 }
565
566 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
567
568 req.rt.rtm_family = AF_INET6;
569 req.rt.rtm_dst_len = prefixlen;
570 req.rt.rtm_table = RT_TABLE_MAIN;
571 req.rt.rtm_protocol = 42;
572 req.rt.rtm_scope = RT_SCOPE_LINK;
573 req.rt.rtm_type = RTN_UNICAST;
574
575 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
576 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
577 metric = 1;
578 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
579
580 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
581 add ? "add" : "del",
582 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
583 prefixlen);
584
585 if (netlink_send(&req.nh) < 0)
586 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
587
588 #ifdef BGP
589 if (add)
590 bgp_add_route6(ip, prefixlen);
591 else
592 bgp_del_route6(ip, prefixlen);
593 #endif /* BGP */
594
595 if (s)
596 {
597 if (!add) // Are we deleting a route?
598 s = 0; // Caching the session as '0' is the same as uncaching.
599
600 cache_ipv6map(ip, prefixlen, s);
601 }
602
603 return;
604 }
605
606 //
607 // Set up netlink socket
608 static void initnetlink(void)
609 {
610 struct sockaddr_nl nladdr;
611
612 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
613 if (nlfd < 0)
614 {
615 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
616 exit(1);
617 }
618
619 memset(&nladdr, 0, sizeof(nladdr));
620 nladdr.nl_family = AF_NETLINK;
621 nladdr.nl_pid = getpid();
622
623 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
624 {
625 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
626 exit(1);
627 }
628 }
629
630 static ssize_t netlink_send(struct nlmsghdr *nh)
631 {
632 struct sockaddr_nl nladdr;
633 struct iovec iov;
634 struct msghdr msg;
635
636 nh->nlmsg_pid = getpid();
637 nh->nlmsg_seq = ++nlseqnum;
638
639 // set kernel address
640 memset(&nladdr, 0, sizeof(nladdr));
641 nladdr.nl_family = AF_NETLINK;
642
643 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
644 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
645
646 return sendmsg(nlfd, &msg, 0);
647 }
648
649 static ssize_t netlink_recv(void *buf, ssize_t len)
650 {
651 struct sockaddr_nl nladdr;
652 struct iovec iov;
653 struct msghdr msg;
654
655 // set kernel address
656 memset(&nladdr, 0, sizeof(nladdr));
657 nladdr.nl_family = AF_NETLINK;
658
659 iov = (struct iovec){ buf, len };
660 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
661
662 return recvmsg(nlfd, &msg, 0);
663 }
664
665 /* adapted from iproute2 */
666 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
667 {
668 int len = RTA_LENGTH(alen);
669 struct rtattr *rta;
670
671 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
672 rta->rta_type = type;
673 rta->rta_len = len;
674 memcpy(RTA_DATA(rta), data, alen);
675 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
676 }
677
678 // messages corresponding to different phases seq number
679 static char *tun_nl_phase_msg[] = {
680 "initialized",
681 "getting tun interface index",
682 "setting tun interface parameters",
683 "setting tun IPv4 address",
684 "setting tun LL IPv6 address",
685 "setting tun global IPv6 address",
686 };
687
688 //
689 // Set up TUN interface
690 static void inittun(void)
691 {
692 struct ifreq ifr;
693
694 memset(&ifr, 0, sizeof(ifr));
695 ifr.ifr_flags = IFF_TUN;
696
697 tunfd = open(TUNDEVICE, O_RDWR);
698 if (tunfd < 0)
699 { // fatal
700 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
701 exit(1);
702 }
703 {
704 int flags = fcntl(tunfd, F_GETFL, 0);
705 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
706 }
707
708 if (*config->tundevicename)
709 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
710
711 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
712 {
713 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
714 exit(1);
715 }
716 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
717 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
718
719 tunidx = if_nametoindex(config->tundevicename);
720 if (tunidx == 0)
721 {
722 LOG(0, 0, 0, "Can't get tun interface index\n");
723 exit(1);
724 }
725
726 {
727 struct {
728 // interface setting
729 struct nlmsghdr nh;
730 union {
731 struct ifinfomsg ifinfo;
732 struct ifaddrmsg ifaddr;
733 } ifmsg;
734 char rtdata[32]; // 32 should be enough
735 } req;
736 uint32_t txqlen, mtu;
737 in_addr_t ip;
738
739 memset(&req, 0, sizeof(req));
740
741 req.nh.nlmsg_type = RTM_NEWLINK;
742 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
743 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
744
745 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
746 req.ifmsg.ifinfo.ifi_index = tunidx;
747 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
748 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
749
750 /* Bump up the qlen to deal with bursts from the network */
751 txqlen = 1000;
752 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
753 /* set MTU to modem MRU */
754 mtu = MRU;
755 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
756
757 if (netlink_send(&req.nh) < 0)
758 goto senderror;
759
760 memset(&req, 0, sizeof(req));
761
762 req.nh.nlmsg_type = RTM_NEWADDR;
763 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
764 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
765
766 req.ifmsg.ifaddr.ifa_family = AF_INET;
767 req.ifmsg.ifaddr.ifa_prefixlen = 32;
768 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
769 req.ifmsg.ifaddr.ifa_index = tunidx;
770
771 if (config->nbmultiaddress > 1)
772 {
773 int i;
774 for (i = 0; i < config->nbmultiaddress ; i++)
775 {
776 ip = config->iftun_n_address[i];
777 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
778 if (netlink_send(&req.nh) < 0)
779 goto senderror;
780 }
781 }
782 else
783 {
784 if (config->iftun_address)
785 ip = config->iftun_address;
786 else
787 ip = 0x01010101; // 1.1.1.1
788 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
789
790 if (netlink_send(&req.nh) < 0)
791 goto senderror;
792 }
793
794
795
796 // Only setup IPv6 on the tun device if we have a configured prefix
797 if (config->ipv6_prefix.s6_addr[0]) {
798 struct in6_addr ip6;
799
800 memset(&req, 0, sizeof(req));
801
802 req.nh.nlmsg_type = RTM_NEWADDR;
803 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
804 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
805
806 req.ifmsg.ifaddr.ifa_family = AF_INET6;
807 req.ifmsg.ifaddr.ifa_prefixlen = 64;
808 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
809 req.ifmsg.ifaddr.ifa_index = tunidx;
810
811 // Link local address is FE80::1
812 memset(&ip6, 0, sizeof(ip6));
813 ip6.s6_addr[0] = 0xFE;
814 ip6.s6_addr[1] = 0x80;
815 ip6.s6_addr[15] = 1;
816 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
817
818 if (netlink_send(&req.nh) < 0)
819 goto senderror;
820
821 memset(&req, 0, sizeof(req));
822
823 req.nh.nlmsg_type = RTM_NEWADDR;
824 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
825 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
826
827 req.ifmsg.ifaddr.ifa_family = AF_INET6;
828 req.ifmsg.ifaddr.ifa_prefixlen = 64;
829 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
830 req.ifmsg.ifaddr.ifa_index = tunidx;
831
832 // Global address is prefix::1
833 ip6 = config->ipv6_prefix;
834 ip6.s6_addr[15] = 1;
835 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
836
837 if (netlink_send(&req.nh) < 0)
838 goto senderror;
839 }
840
841 memset(&req, 0, sizeof(req));
842
843 req.nh.nlmsg_type = NLMSG_DONE;
844 req.nh.nlmsg_len = NLMSG_LENGTH(0);
845
846 if (netlink_send(&req.nh) < 0)
847 goto senderror;
848
849 // if we get an error for seqnum < min_initok_nlseqnum,
850 // we must exit as initialization went wrong
851 if (config->ipv6_prefix.s6_addr[0])
852 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
853 else
854 min_initok_nlseqnum = 3 + 1; // idx + if + addr
855 }
856
857 return;
858
859 senderror:
860 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
861 exit(1);
862 }
863
864 // set up LAC UDP ports
865 static void initlacudp(void)
866 {
867 int on = 1;
868 struct sockaddr_in addr;
869
870 // Tunnel to Remote LNS
871 memset(&addr, 0, sizeof(addr));
872 addr.sin_family = AF_INET;
873 addr.sin_port = htons(config->bind_portremotelns);
874 addr.sin_addr.s_addr = config->bind_address_remotelns;
875 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
876 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
877 {
878 int flags = fcntl(udplacfd, F_GETFL, 0);
879 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
880 }
881 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
882 {
883 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
884 exit(1);
885 }
886 }
887
888 // set up control ports
889 static void initcontrol(void)
890 {
891 int on = 1;
892 struct sockaddr_in addr;
893
894 // Control
895 memset(&addr, 0, sizeof(addr));
896 addr.sin_family = AF_INET;
897 addr.sin_port = htons(NSCTL_PORT);
898 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
899 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
900 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
901 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
902 {
903 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
904 exit(1);
905 }
906 }
907
908 // set up Dynamic Authorization Extensions to RADIUS port
909 static void initdae(void)
910 {
911 int on = 1;
912 struct sockaddr_in addr;
913
914 // Dynamic Authorization Extensions to RADIUS
915 memset(&addr, 0, sizeof(addr));
916 addr.sin_family = AF_INET;
917 addr.sin_port = htons(config->radius_dae_port);
918 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
919 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
920 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
921 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
922 {
923 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
924 exit(1);
925 }
926 }
927
928 // set up UDP ports
929 static void initudp(int * pudpfd, in_addr_t ip_bind)
930 {
931 int on = 1;
932 struct sockaddr_in addr;
933
934 // Tunnel
935 memset(&addr, 0, sizeof(addr));
936 addr.sin_family = AF_INET;
937 addr.sin_port = htons(L2TPPORT);
938 addr.sin_addr.s_addr = ip_bind;
939 (*pudpfd) = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
940 setsockopt((*pudpfd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
941 {
942 int flags = fcntl((*pudpfd), F_GETFL, 0);
943 fcntl((*pudpfd), F_SETFL, flags | O_NONBLOCK);
944 }
945 if (bind((*pudpfd), (struct sockaddr *) &addr, sizeof(addr)) < 0)
946 {
947 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
948 exit(1);
949 }
950 }
951
952 //
953 // Find session by IP, < 1 for not found
954 //
955 // Confusingly enough, this 'ip' must be
956 // in _network_ order. This being the common
957 // case when looking it up from IP packet headers.
958 //
959 // We actually use this cache for two things.
960 // #1. For used IP addresses, this maps to the
961 // session ID that it's used by.
962 // #2. For un-used IP addresses, this maps to the
963 // index into the pool table that contains that
964 // IP address.
965 //
966
967 static sessionidt lookup_ipmap(in_addr_t ip)
968 {
969 uint8_t *a = (uint8_t *) &ip;
970 union iphash *h = ip_hash;
971
972 if (!(h = h[*a++].idx)) return 0;
973 if (!(h = h[*a++].idx)) return 0;
974 if (!(h = h[*a++].idx)) return 0;
975
976 return h[*a].sess;
977 }
978
979 static sessionidt lookup_ipv6map(struct in6_addr ip)
980 {
981 struct ipv6radix *curnode;
982 int i;
983 int s;
984 char ipv6addr[INET6_ADDRSTRLEN];
985
986 curnode = &ipv6_hash[((ip.s6_addr[0]) & 0xF0)>>4];
987 i = 1;
988 s = curnode->sess;
989
990 while (s == 0 && i < 32 && curnode->branch != NULL)
991 {
992 if (i & 1)
993 curnode = &curnode->branch[ip.s6_addr[i>>1] & 0x0F];
994 else
995 curnode = &curnode->branch[(ip.s6_addr[i>>1] & 0xF0)>>4];
996
997 s = curnode->sess;
998 i++;
999 }
1000
1001 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
1002 inet_ntop(AF_INET6, &ip, ipv6addr,
1003 INET6_ADDRSTRLEN),
1004 s);
1005
1006 return s;
1007 }
1008
1009 sessionidt sessionbyip(in_addr_t ip)
1010 {
1011 sessionidt s = lookup_ipmap(ip);
1012 CSTAT(sessionbyip);
1013
1014 if (s > 0 && s < MAXSESSION && session[s].opened)
1015 return s;
1016
1017 return 0;
1018 }
1019
1020 sessionidt sessionbyipv6(struct in6_addr ip)
1021 {
1022 sessionidt s;
1023 CSTAT(sessionbyipv6);
1024
1025 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
1026 (ip.s6_addr[0] == 0xFE &&
1027 ip.s6_addr[1] == 0x80 &&
1028 ip.s6_addr16[1] == 0 &&
1029 ip.s6_addr16[2] == 0 &&
1030 ip.s6_addr16[3] == 0))
1031 {
1032 in_addr_t *pipv4 = (in_addr_t *) &ip.s6_addr[8];
1033 s = lookup_ipmap(*pipv4);
1034 } else {
1035 s = lookup_ipv6map(ip);
1036 }
1037
1038 if (s > 0 && s < MAXSESSION && session[s].opened)
1039 return s;
1040
1041 return 0;
1042 }
1043
1044 sessionidt sessionbyipv6new(struct in6_addr ip)
1045 {
1046 sessionidt s;
1047 CSTAT(sessionbyipv6new);
1048
1049 s = lookup_ipv6map(ip);
1050
1051 if (s > 0 && s < MAXSESSION && session[s].opened)
1052 return s;
1053
1054 return 0;
1055 }
1056
1057 //
1058 // Take an IP address in HOST byte order and
1059 // add it to the sessionid by IP cache.
1060 //
1061 // (It's actually cached in network order)
1062 //
1063 static void cache_ipmap(in_addr_t ip, sessionidt s)
1064 {
1065 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1066 uint8_t *a = (uint8_t *) &nip;
1067 union iphash *h = ip_hash;
1068 int i;
1069
1070 for (i = 0; i < 3; i++)
1071 {
1072 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1073 return;
1074
1075 h = h[a[i]].idx;
1076 }
1077
1078 h[a[3]].sess = s;
1079
1080 if (s > 0)
1081 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1082
1083 else if (s == 0)
1084 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1085 // else a map to an ip pool index.
1086 }
1087
1088 static void uncache_ipmap(in_addr_t ip)
1089 {
1090 cache_ipmap(ip, 0); // Assign it to the NULL session.
1091 }
1092
1093 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1094 {
1095 int i;
1096 int niblles;
1097 struct ipv6radix *curnode;
1098 char ipv6addr[INET6_ADDRSTRLEN];
1099
1100 curnode = &ipv6_hash[((ip.s6_addr[0]) & 0xF0)>>4];
1101
1102 niblles = prefixlen >> 2;
1103 i = 1;
1104
1105 while (i < niblles)
1106 {
1107 if (curnode->branch == NULL)
1108 {
1109 if (!(curnode->branch = calloc(16, sizeof (struct ipv6radix))))
1110 return;
1111 }
1112
1113 if (i & 1)
1114 curnode = &curnode->branch[ip.s6_addr[i>>1] & 0x0F];
1115 else
1116 curnode = &curnode->branch[(ip.s6_addr[i>>1] & 0xF0)>>4];
1117
1118 i++;
1119 }
1120
1121 curnode->sess = s;
1122
1123 if (s > 0)
1124 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1125 inet_ntop(AF_INET6, &ip, ipv6addr,
1126 INET6_ADDRSTRLEN),
1127 prefixlen);
1128 else if (s == 0)
1129 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1130 inet_ntop(AF_INET6, &ip, ipv6addr,
1131 INET6_ADDRSTRLEN),
1132 prefixlen);
1133 }
1134
1135 //
1136 // CLI list to dump current ipcache.
1137 //
1138 int cmd_show_ipcache(struct cli_def *cli, const char *command, char **argv, int argc)
1139 {
1140 union iphash *d = ip_hash, *e, *f, *g;
1141 int i, j, k, l;
1142 int count = 0;
1143
1144 if (CLI_HELP_REQUESTED)
1145 return CLI_HELP_NO_ARGS;
1146
1147 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1148
1149 for (i = 0; i < 256; ++i)
1150 {
1151 if (!d[i].idx)
1152 continue;
1153
1154 e = d[i].idx;
1155 for (j = 0; j < 256; ++j)
1156 {
1157 if (!e[j].idx)
1158 continue;
1159
1160 f = e[j].idx;
1161 for (k = 0; k < 256; ++k)
1162 {
1163 if (!f[k].idx)
1164 continue;
1165
1166 g = f[k].idx;
1167 for (l = 0; l < 256; ++l)
1168 {
1169 if (!g[l].sess)
1170 continue;
1171
1172 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1173 ++count;
1174 }
1175 }
1176 }
1177 }
1178 cli_print(cli, "%d entries in cache", count);
1179 return CLI_OK;
1180 }
1181
1182 // Find session by username, 0 for not found
1183 // walled garden users aren't authenticated, so the username is
1184 // reasonably useless. Ignore them to avoid incorrect actions
1185 //
1186 // This is VERY inefficent. Don't call it often. :)
1187 //
1188 sessionidt sessionbyuser(char *username)
1189 {
1190 int s;
1191 CSTAT(sessionbyuser);
1192
1193 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1194 {
1195 if (!session[s].opened)
1196 continue;
1197
1198 if (session[s].walled_garden)
1199 continue; // Skip walled garden users.
1200
1201 if (!strncmp(session[s].user, username, 128))
1202 return s;
1203
1204 }
1205 return 0; // Not found.
1206 }
1207
1208 void send_garp(in_addr_t ip)
1209 {
1210 int s;
1211 struct ifreq ifr;
1212 uint8_t mac[6];
1213
1214 s = socket(PF_INET, SOCK_DGRAM, 0);
1215 if (s < 0)
1216 {
1217 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1218 return;
1219 }
1220 memset(&ifr, 0, sizeof(ifr));
1221 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1222 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1223 {
1224 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1225 close(s);
1226 return;
1227 }
1228 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1229 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1230 {
1231 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1232 close(s);
1233 return;
1234 }
1235 close(s);
1236 sendarp(ifr.ifr_ifindex, mac, ip);
1237 }
1238
1239 static sessiont *sessiontbysessionidt(sessionidt s)
1240 {
1241 if (!s || s >= MAXSESSION) return NULL;
1242 return &session[s];
1243 }
1244
1245 static sessionidt sessionidtbysessiont(sessiont *s)
1246 {
1247 sessionidt val = s-session;
1248 if (s < session || val >= MAXSESSION) return 0;
1249 return val;
1250 }
1251
1252 // actually send a control message for a specific tunnel
1253 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1254 {
1255 struct sockaddr_in addr;
1256
1257 CSTAT(tunnelsend);
1258
1259 if (!t)
1260 {
1261 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1262 STAT(tunnel_tx_errors);
1263 return;
1264 }
1265
1266 if (t == TUNNEL_ID_PPPOE)
1267 {
1268 pppoe_sess_send(buf, l, t);
1269 return;
1270 }
1271
1272 if (!tunnel[t].ip)
1273 {
1274 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1275 STAT(tunnel_tx_errors);
1276 return;
1277 }
1278
1279 memset(&addr, 0, sizeof(addr));
1280 addr.sin_family = AF_INET;
1281 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1282 addr.sin_port = htons(tunnel[t].port);
1283
1284 // sequence expected, if sequence in message
1285 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1286
1287 // If this is a control message, deal with retries
1288 if (*buf & 0x80)
1289 {
1290 tunnel[t].last = time_now; // control message sent
1291 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1292 if (tunnel[t].try)
1293 {
1294 STAT(tunnel_retries);
1295 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1296 }
1297 }
1298
1299 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1300 {
1301 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1302 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1303 STAT(tunnel_tx_errors);
1304 return;
1305 }
1306
1307 LOG_HEX(5, "Send Tunnel Data", buf, l);
1308 STAT(tunnel_tx_packets);
1309 INC_STAT(tunnel_tx_bytes, l);
1310 }
1311
1312 //
1313 // Tiny helper function to write data to
1314 // the 'tun' device.
1315 //
1316 int tun_write(uint8_t * data, int size)
1317 {
1318 return write(tunfd, data, size);
1319 }
1320
1321 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1322 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1323 {
1324 int d = (tcp[12] >> 4) * 4;
1325 uint8_t *mss = 0;
1326 uint8_t *opts;
1327 uint8_t *data;
1328 uint16_t orig;
1329 uint32_t sum;
1330
1331 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1332 return;
1333
1334 if (tcp + d > buf + len) // short?
1335 return;
1336
1337 opts = tcp + 20;
1338 data = tcp + d;
1339
1340 while (opts < data)
1341 {
1342 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1343 {
1344 mss = opts + 2;
1345 if (mss + 2 > data) return; // short?
1346 break;
1347 }
1348
1349 if (*opts == 0) return; // end of options
1350 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1351 opts++;
1352 else
1353 opts += opts[1]; // skip over option
1354 }
1355
1356 if (!mss) return; // not found
1357 orig = ntohs(*(uint16_t *) mss);
1358
1359 if (orig <= MSS) return; // mss OK
1360
1361 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1362 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1363 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1364 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1365
1366 // set mss
1367 *(int16_t *) mss = htons(MSS);
1368
1369 // adjust checksum (see rfc1141)
1370 sum = orig + (~MSS & 0xffff);
1371 sum += ntohs(*(uint16_t *) (tcp + 16));
1372 sum = (sum & 0xffff) + (sum >> 16);
1373 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1374 }
1375
1376 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1377 {
1378 uint16_t proto;
1379 if (extra) {
1380 // Skip the four extra bytes
1381 p += 4;
1382 l -= 4;
1383 }
1384
1385 if (*p & 1)
1386 {
1387 proto = *p++;
1388 l--;
1389 }
1390 else
1391 {
1392 proto = ntohs(*(uint16_t *) p);
1393 p += 2;
1394 l -= 2;
1395 }
1396 if (proto == PPPIP)
1397 {
1398 if (session[s].die)
1399 {
1400 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1401 return; // closing session, PPP not processed
1402 }
1403 session[s].last_packet = session[s].last_data = time_now;
1404 processipin(s, t, p, l);
1405 }
1406 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1407 {
1408 if (session[s].die)
1409 {
1410 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1411 return; // closing session, PPP not processed
1412 }
1413
1414 session[s].last_packet = session[s].last_data = time_now;
1415 processipv6in(s, t, p, l);
1416 }
1417 else if (proto == PPPIPCP)
1418 {
1419 session[s].last_packet = session[s].last_data = time_now;
1420 processipcp(s, t, p, l);
1421 }
1422 else if (proto == PPPCCP)
1423 {
1424 session[s].last_packet = session[s].last_data = time_now;
1425 processccp(s, t, p, l);
1426 }
1427 else
1428 {
1429 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1430 }
1431 }
1432
1433 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1434 {
1435 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1436 sp->cout_delta += len;
1437 sp->pout++;
1438 sp->last_data = time_now;
1439
1440 sess_local[s].cout += len; // To send to master..
1441 sess_local[s].pout++;
1442 }
1443
1444 // process outgoing (to tunnel) IP
1445 //
1446 // (i.e. this routine writes to data[-8]).
1447 void processipout(uint8_t *buf, int len)
1448 {
1449 sessionidt s;
1450 sessiont *sp;
1451 tunnelidt t;
1452 in_addr_t ip, ip_src;
1453
1454 uint8_t *data = buf; // Keep a copy of the originals.
1455 int size = len;
1456
1457 uint8_t fragbuf[MAXETHER + 20];
1458
1459 CSTAT(processipout);
1460
1461 if (len < MIN_IP_SIZE)
1462 {
1463 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1464 STAT(tun_rx_errors);
1465 return;
1466 }
1467 if (len >= MAXETHER)
1468 {
1469 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1470 STAT(tun_rx_errors);
1471 return;
1472 }
1473
1474 // Skip the tun header
1475 buf += 4;
1476 len -= 4;
1477
1478 // Got an IP header now
1479 if (*(uint8_t *)(buf) >> 4 != 4)
1480 {
1481 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1482 return;
1483 }
1484
1485 ip_src = *(uint32_t *)(buf + 12);
1486 ip = *(uint32_t *)(buf + 16);
1487 if (!(s = sessionbyip(ip)))
1488 {
1489 // Is this a packet for a session that doesn't exist?
1490 static int rate = 0; // Number of ICMP packets we've sent this second.
1491 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1492
1493 if (last != time_now)
1494 {
1495 last = time_now;
1496 rate = 0;
1497 }
1498
1499 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1500 {
1501 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1502 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1503 config->bind_address ? config->bind_address : my_address, buf, len);
1504 }
1505 return;
1506 }
1507
1508 t = session[s].tunnel;
1509 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1510 {
1511 LOG(3, s, t, "Packet size more than session MRU\n");
1512 return;
1513 }
1514
1515 sp = &session[s];
1516
1517 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1518 if (config->max_packets > 0)
1519 {
1520 if (sess_local[s].last_packet_out == TIME)
1521 {
1522 int max = config->max_packets;
1523
1524 // All packets for throttled sessions are handled by the
1525 // master, so further limit by using the throttle rate.
1526 // A bit of a kludge, since throttle rate is in kbps,
1527 // but should still be generous given our average DSL
1528 // packet size is 200 bytes: a limit of 28kbps equates
1529 // to around 180 packets per second.
1530 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1531 max = sp->throttle_out;
1532
1533 if (++sess_local[s].packets_out > max)
1534 {
1535 sess_local[s].packets_dropped++;
1536 return;
1537 }
1538 }
1539 else
1540 {
1541 if (sess_local[s].packets_dropped)
1542 {
1543 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1544 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1545 sess_local[s].packets_dropped, sess_local[s].packets_out,
1546 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1547 sp->user);
1548 }
1549
1550 sess_local[s].last_packet_out = TIME;
1551 sess_local[s].packets_out = 1;
1552 sess_local[s].packets_dropped = 0;
1553 }
1554 }
1555
1556 // run access-list if any
1557 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1558 return;
1559
1560 // adjust MSS on SYN and SYN,ACK packets with options
1561 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1562 {
1563 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1564 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1565 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1566 }
1567
1568 if (sp->tbf_out)
1569 {
1570 if (!config->no_throttle_local_IP || !sessionbyip(ip_src))
1571 {
1572 // Are we throttling this session?
1573 if (config->cluster_iam_master)
1574 tbf_queue_packet(sp->tbf_out, data, size);
1575 else
1576 master_throttle_packet(sp->tbf_out, data, size);
1577 return;
1578 }
1579 }
1580
1581 if (sp->walled_garden && !config->cluster_iam_master)
1582 {
1583 // We are walled-gardening this
1584 master_garden_packet(s, data, size);
1585 return;
1586 }
1587
1588 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1589 {
1590
1591 if (!config->cluster_iam_master)
1592 {
1593 // The MPPP packets must be managed by the Master.
1594 master_forward_mppp_packet(s, data, size);
1595 return;
1596 }
1597
1598 // Add on L2TP header
1599 sessionidt members[MAXBUNDLESES];
1600 bundleidt bid = session[s].bundle;
1601 bundlet *b = &bundle[bid];
1602 uint32_t num_of_links, nb_opened;
1603 int i;
1604
1605 num_of_links = b->num_of_links;
1606 nb_opened = 0;
1607 for (i = 0;i < num_of_links;i++)
1608 {
1609 s = b->members[i];
1610 if (session[s].ppp.lcp == Opened)
1611 {
1612 members[nb_opened] = s;
1613 nb_opened++;
1614 }
1615 }
1616
1617 if (nb_opened < 1)
1618 {
1619 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1620 return;
1621 }
1622
1623 num_of_links = nb_opened;
1624 b->current_ses = (b->current_ses + 1) % num_of_links;
1625 s = members[b->current_ses];
1626 t = session[s].tunnel;
1627 sp = &session[s];
1628 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1629
1630 if (num_of_links > 1)
1631 {
1632 if(len > MINFRAGLEN)
1633 {
1634 //for rotate traffic among the member links
1635 uint32_t divisor = num_of_links;
1636 if (divisor > 2)
1637 divisor = divisor/2 + (divisor & 1);
1638
1639 // Partition the packet to "num_of_links" fragments
1640 uint32_t fraglen = len / divisor;
1641 uint32_t last_fraglen = fraglen + len % divisor;
1642 uint32_t remain = len;
1643
1644 // send the first packet
1645 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1646 if (!p) return;
1647 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1648
1649 // statistics
1650 update_session_out_stat(s, sp, fraglen);
1651
1652 remain -= fraglen;
1653 while (remain > last_fraglen)
1654 {
1655 b->current_ses = (b->current_ses + 1) % num_of_links;
1656 s = members[b->current_ses];
1657 t = session[s].tunnel;
1658 sp = &session[s];
1659 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1660 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1661 if (!p) return;
1662 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1663 update_session_out_stat(s, sp, fraglen);
1664 remain -= fraglen;
1665 }
1666 // send the last fragment
1667 b->current_ses = (b->current_ses + 1) % num_of_links;
1668 s = members[b->current_ses];
1669 t = session[s].tunnel;
1670 sp = &session[s];
1671 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1672 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1673 if (!p) return;
1674 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1675 update_session_out_stat(s, sp, remain);
1676 if (remain != last_fraglen)
1677 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1678 }
1679 else
1680 {
1681 // Send it as one frame
1682 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1683 if (!p) return;
1684 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1685 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1686 update_session_out_stat(s, sp, len);
1687 }
1688 }
1689 else
1690 {
1691 // Send it as one frame (NO MPPP Frame)
1692 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1693 tunnelsend(p, len + (buf-p), t); // send it...
1694 update_session_out_stat(s, sp, len);
1695 }
1696 }
1697 else
1698 {
1699 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1700 tunnelsend(p, len + (buf-p), t); // send it...
1701 update_session_out_stat(s, sp, len);
1702 }
1703
1704 // Snooping this session, send it to intercept box
1705 if (sp->snoop_ip && sp->snoop_port)
1706 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1707
1708 udp_tx += len;
1709 }
1710
1711 // process outgoing (to tunnel) IPv6
1712 //
1713 static void processipv6out(uint8_t * buf, int len)
1714 {
1715 sessionidt s;
1716 sessiont *sp;
1717 tunnelidt t;
1718 struct in6_addr ip6;
1719
1720 uint8_t *data = buf; // Keep a copy of the originals.
1721 int size = len;
1722
1723 uint8_t b[MAXETHER + 20];
1724
1725 CSTAT(processipv6out);
1726
1727 if (len < MIN_IP_SIZE)
1728 {
1729 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1730 STAT(tunnel_tx_errors);
1731 return;
1732 }
1733 if (len >= MAXETHER)
1734 {
1735 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1736 STAT(tunnel_tx_errors);
1737 return;
1738 }
1739
1740 // Skip the tun header
1741 buf += 4;
1742 len -= 4;
1743
1744 // Got an IP header now
1745 if (*(uint8_t *)(buf) >> 4 != 6)
1746 {
1747 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1748 return;
1749 }
1750
1751 ip6 = *(struct in6_addr *)(buf+24);
1752 s = sessionbyipv6(ip6);
1753
1754 if (s == 0)
1755 {
1756 s = sessionbyipv6new(ip6);
1757 }
1758
1759 if (s == 0)
1760 {
1761 // Is this a packet for a session that doesn't exist?
1762 static int rate = 0; // Number of ICMP packets we've sent this second.
1763 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1764
1765 if (last != time_now)
1766 {
1767 last = time_now;
1768 rate = 0;
1769 }
1770
1771 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1772 {
1773 // FIXME: Should send icmp6 host unreachable
1774 }
1775 return;
1776 }
1777 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1778 {
1779 bundleidt bid = session[s].bundle;
1780 bundlet *b = &bundle[bid];
1781
1782 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1783 s = b->members[b->current_ses];
1784 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1785 }
1786 t = session[s].tunnel;
1787 sp = &session[s];
1788 sp->last_data = time_now;
1789
1790 // FIXME: add DoS prevention/filters?
1791
1792 if (sp->tbf_out)
1793 {
1794 // Are we throttling this session?
1795 if (config->cluster_iam_master)
1796 tbf_queue_packet(sp->tbf_out, data, size);
1797 else
1798 master_throttle_packet(sp->tbf_out, data, size);
1799 return;
1800 }
1801 else if (sp->walled_garden && !config->cluster_iam_master)
1802 {
1803 // We are walled-gardening this
1804 master_garden_packet(s, data, size);
1805 return;
1806 }
1807
1808 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1809
1810 // Add on L2TP header
1811 {
1812 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1813 if (!p) return;
1814 tunnelsend(b, len + (p-b), t); // send it...
1815 }
1816
1817 // Snooping this session, send it to intercept box
1818 if (sp->snoop_ip && sp->snoop_port)
1819 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1820
1821 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1822 sp->cout_delta += len;
1823 sp->pout++;
1824 udp_tx += len;
1825
1826 sess_local[s].cout += len; // To send to master..
1827 sess_local[s].pout++;
1828 }
1829
1830 //
1831 // Helper routine for the TBF filters.
1832 // Used to send queued data in to the user!
1833 //
1834 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1835 {
1836 sessiont *sp;
1837 tunnelidt t;
1838 uint8_t *p;
1839 uint8_t *data = buf; // Keep a copy of the originals.
1840
1841 uint8_t b[MAXETHER + 20];
1842
1843 if (len < 0 || len > MAXETHER)
1844 {
1845 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1846 return;
1847 }
1848
1849 // Skip the tun header
1850 buf += 4;
1851 len -= 4;
1852
1853 if (!session[s].ip)
1854 return;
1855
1856 t = session[s].tunnel;
1857 sp = &session[s];
1858
1859 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1860
1861 // Add on L2TP header
1862 if (*(uint16_t *) (data + 2) == htons(PKTIPV6))
1863 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0); // IPV6
1864 else
1865 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0); // IPV4
1866
1867 if (!p) return;
1868
1869 tunnelsend(b, len + (p-b), t); // send it...
1870
1871 // Snooping this session.
1872 if (sp->snoop_ip && sp->snoop_port)
1873 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1874
1875 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1876 sp->cout_delta += len;
1877 sp->pout++;
1878 udp_tx += len;
1879
1880 sess_local[s].cout += len; // To send to master..
1881 sess_local[s].pout++;
1882 }
1883
1884 // add an AVP (16 bit)
1885 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1886 {
1887 uint16_t l = (m ? 0x8008 : 0x0008);
1888 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1889 pint16[0] = htons(l);
1890 pint16[1] = htons(0);
1891 pint16[2] = htons(avp);
1892 pint16[3] = htons(val);
1893 c->length += 8;
1894 }
1895
1896 // add an AVP (32 bit)
1897 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1898 {
1899 uint16_t l = (m ? 0x800A : 0x000A);
1900 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1901 uint32_t *pint32 = (uint32_t *) (c->buf + c->length + 6);
1902 pint16[0] = htons(l);
1903 pint16[1] = htons(0);
1904 pint16[2] = htons(avp);
1905 pint32[0] = htonl(val);
1906 c->length += 10;
1907 }
1908
1909 // add an AVP (string)
1910 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1911 {
1912 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1913 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1914 pint16[0] = htons(l);
1915 pint16[1] = htons(0);
1916 pint16[2] = htons(avp);
1917 memcpy(c->buf + c->length + 6, val, strlen(val));
1918 c->length += 6 + strlen(val);
1919 }
1920
1921 // add a binary AVP
1922 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1923 {
1924 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1925 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1926 pint16[0] = htons(l);
1927 pint16[1] = htons(0);
1928 pint16[2] = htons(avp);
1929 memcpy(c->buf + c->length + 6, val, len);
1930 c->length += 6 + len;
1931 }
1932
1933 // new control connection
1934 static controlt *controlnew(uint16_t mtype)
1935 {
1936 controlt *c;
1937 if (!controlfree)
1938 c = malloc(sizeof(controlt));
1939 else
1940 {
1941 c = controlfree;
1942 controlfree = c->next;
1943 }
1944 assert(c);
1945 c->next = 0;
1946 c->buf[0] = 0xC8; // flags
1947 c->buf[1] = 0x02; // ver
1948 c->length = 12;
1949 control16(c, 0, mtype, 1);
1950 return c;
1951 }
1952
1953 // send zero block if nothing is waiting
1954 // (ZLB send).
1955 static void controlnull(tunnelidt t)
1956 {
1957 uint16_t buf[6];
1958 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1959 return;
1960
1961 buf[0] = htons(0xC802); // flags/ver
1962 buf[1] = htons(12); // length
1963 buf[2] = htons(tunnel[t].far); // tunnel
1964 buf[3] = htons(0); // session
1965 buf[4] = htons(tunnel[t].ns); // sequence
1966 buf[5] = htons(tunnel[t].nr); // sequence
1967 tunnelsend((uint8_t *)buf, 12, t);
1968 }
1969
1970 // add a control message to a tunnel, and send if within window
1971 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1972 {
1973 uint16_t *pint16 = (uint16_t *) (c->buf + 2);
1974 pint16[0] = htons(c->length); // length
1975 pint16[1] = htons(tunnel[t].far); // tunnel
1976 pint16[2] = htons(far); // session
1977 pint16[3] = htons(tunnel[t].ns); // sequence
1978 tunnel[t].ns++; // advance sequence
1979 // link in message in to queue
1980 if (tunnel[t].controlc)
1981 tunnel[t].controle->next = c;
1982 else
1983 tunnel[t].controls = c;
1984
1985 tunnel[t].controle = c;
1986 tunnel[t].controlc++;
1987
1988 // send now if space in window
1989 if (tunnel[t].controlc <= tunnel[t].window)
1990 {
1991 tunnel[t].try = 0; // first send
1992 tunnelsend(c->buf, c->length, t);
1993 }
1994 }
1995
1996 //
1997 // Throttle or Unthrottle a session
1998 //
1999 // Throttle the data from/to through a session to no more than
2000 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
2001 // user).
2002 //
2003 // If either value is -1, the current value is retained for that
2004 // direction.
2005 //
2006 void throttle_session(sessionidt s, int rate_in, int rate_out)
2007 {
2008 if (!session[s].opened)
2009 return; // No-one home.
2010
2011 if (!*session[s].user)
2012 return; // User not logged in
2013
2014 if (rate_in >= 0)
2015 {
2016 int bytes = rate_in * 1024 / 8; // kbits to bytes
2017 if (session[s].tbf_in)
2018 free_tbf(session[s].tbf_in);
2019
2020 if (rate_in > 0)
2021 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
2022 else
2023 session[s].tbf_in = 0;
2024
2025 session[s].throttle_in = rate_in;
2026 }
2027
2028 if (rate_out >= 0)
2029 {
2030 int bytes = rate_out * 1024 / 8;
2031 if (session[s].tbf_out)
2032 free_tbf(session[s].tbf_out);
2033
2034 if (rate_out > 0)
2035 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
2036 else
2037 session[s].tbf_out = 0;
2038
2039 session[s].throttle_out = rate_out;
2040 }
2041 }
2042
2043 // add/remove filters from session (-1 = no change)
2044 void filter_session(sessionidt s, int filter_in, int filter_out)
2045 {
2046 if (!session[s].opened)
2047 return; // No-one home.
2048
2049 if (!*session[s].user)
2050 return; // User not logged in
2051
2052 // paranoia
2053 if (filter_in > MAXFILTER) filter_in = -1;
2054 if (filter_out > MAXFILTER) filter_out = -1;
2055 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2056 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2057
2058 if (filter_in >= 0)
2059 {
2060 if (session[s].filter_in)
2061 ip_filters[session[s].filter_in - 1].used--;
2062
2063 if (filter_in > 0)
2064 ip_filters[filter_in - 1].used++;
2065
2066 session[s].filter_in = filter_in;
2067 }
2068
2069 if (filter_out >= 0)
2070 {
2071 if (session[s].filter_out)
2072 ip_filters[session[s].filter_out - 1].used--;
2073
2074 if (filter_out > 0)
2075 ip_filters[filter_out - 1].used++;
2076
2077 session[s].filter_out = filter_out;
2078 }
2079 }
2080
2081 // start tidy shutdown of session
2082 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2083 {
2084 int walled_garden = session[s].walled_garden;
2085 bundleidt b = session[s].bundle;
2086 //delete routes only for last session in bundle (in case of MPPP)
2087 int del_routes = !b || (bundle[b].num_of_links == 1);
2088
2089 CSTAT(sessionshutdown);
2090
2091 if (!session[s].opened)
2092 {
2093 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2094 return; // not a live session
2095 }
2096
2097 if (!session[s].die)
2098 {
2099 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2100 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2101 run_plugins(PLUGIN_KILL_SESSION, &data);
2102 }
2103
2104 if (session[s].ip && !walled_garden && !session[s].die)
2105 {
2106 // RADIUS Stop message
2107 uint16_t r = radiusnew(s);
2108 if (r)
2109 {
2110 // stop, if not already trying
2111 if (radius[r].state != RADIUSSTOP)
2112 {
2113 radius[r].term_cause = term_cause;
2114 radius[r].term_msg = reason;
2115 radiussend(r, RADIUSSTOP);
2116 }
2117 }
2118 else
2119 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2120
2121 // Save counters to dump to accounting file
2122 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2123 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2124 }
2125
2126 if (!session[s].die)
2127 session[s].die = TIME + 150; // Clean up in 15 seconds
2128
2129 if (session[s].ip)
2130 { // IP allocated, clear and unroute
2131 int r;
2132 int routed = 0;
2133 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2134 {
2135 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2136 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2137 routed++;
2138
2139 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2140 session[s].route[r].ip = 0;
2141 }
2142
2143 if (session[s].ip_pool_index == -1) // static ip
2144 {
2145 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2146 session[s].ip = 0;
2147 }
2148 else
2149 free_ip_address(s);
2150
2151 // unroute IPv6, if setup
2152 for (r = 0; r < MAXROUTE6 && session[s].route6[r].ipv6route.s6_addr[0] && session[s].route6[r].ipv6prefixlen; r++)
2153 {
2154 if (del_routes) route6set(s, session[s].route6[r].ipv6route, session[s].route6[r].ipv6prefixlen, 0);
2155 memset(&session[s].route6[r], 0, sizeof(session[s].route6[r]));
2156 }
2157
2158 if (session[s].ipv6address.s6_addr[0] && del_routes)
2159 {
2160 route6set(s, session[s].ipv6address, 128, 0);
2161 }
2162
2163 if (b)
2164 {
2165 // This session was part of a bundle
2166 bundle[b].num_of_links--;
2167 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2168 if(bundle[b].num_of_links == 0)
2169 {
2170 bundleclear(b);
2171 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2172 }
2173 else
2174 {
2175 // Adjust the members array to accomodate the new change
2176 uint8_t mem_num = 0;
2177 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2178 if(bundle[b].members[bundle[b].num_of_links] != s)
2179 {
2180 uint8_t ml;
2181 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2182 if(bundle[b].members[ml] == s)
2183 {
2184 mem_num = ml;
2185 break;
2186 }
2187 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2188 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2189
2190 // If the killed session is the first of the bundle,
2191 // the new first session must be stored in the cache_ipmap
2192 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2193 if (mem_num == 0)
2194 {
2195 sessionidt new_s = bundle[b].members[0];
2196
2197 routed = 0;
2198 // Add the route for this session.
2199 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2200 {
2201 int i, prefixlen;
2202 in_addr_t ip;
2203
2204 prefixlen = session[new_s].route[r].prefixlen;
2205 ip = session[new_s].route[r].ip;
2206
2207 if (!prefixlen) prefixlen = 32;
2208 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2209
2210 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2211 cache_ipmap(i, new_s);
2212 }
2213 cache_ipmap(session[new_s].ip, new_s);
2214
2215 // IPV6 route
2216 for (r = 0; r < MAXROUTE6 && session[new_s].route6[r].ipv6prefixlen; r++)
2217 {
2218 cache_ipv6map(session[new_s].route6[r].ipv6route, session[new_s].route6[r].ipv6prefixlen, new_s);
2219 }
2220
2221 if (session[new_s].ipv6address.s6_addr[0])
2222 {
2223 cache_ipv6map(session[new_s].ipv6address, 128, new_s);
2224 }
2225 }
2226 }
2227 }
2228
2229 cluster_send_bundle(b);
2230 }
2231 }
2232
2233 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2234 throttle_session(s, 0, 0);
2235
2236 if (cdn_result)
2237 {
2238 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2239 {
2240 pppoe_shutdown_session(s);
2241 }
2242 else
2243 {
2244 // Send CDN
2245 controlt *c = controlnew(14); // sending CDN
2246 if (cdn_error)
2247 {
2248 uint16_t buf[2];
2249 buf[0] = htons(cdn_result);
2250 buf[1] = htons(cdn_error);
2251 controlb(c, 1, (uint8_t *)buf, 4, 1);
2252 }
2253 else
2254 control16(c, 1, cdn_result, 1);
2255
2256 control16(c, 14, s, 1); // assigned session (our end)
2257 controladd(c, session[s].far, session[s].tunnel); // send the message
2258 }
2259 }
2260
2261 // update filter refcounts
2262 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2263 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2264
2265 // clear PPP state
2266 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2267 sess_local[s].lcp.restart = 0;
2268 sess_local[s].ipcp.restart = 0;
2269 sess_local[s].ipv6cp.restart = 0;
2270 sess_local[s].ccp.restart = 0;
2271
2272 cluster_send_session(s);
2273 }
2274
2275 void sendipcp(sessionidt s, tunnelidt t)
2276 {
2277 uint8_t buf[MAXETHER];
2278 uint8_t *q;
2279
2280 CSTAT(sendipcp);
2281 LOG(3, s, t, "IPCP: send ConfigReq\n");
2282
2283 if (!session[s].unique_id)
2284 {
2285 if (!++last_id) ++last_id; // skip zero
2286 session[s].unique_id = last_id;
2287 }
2288
2289 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2290 if (!q) return;
2291
2292 *q = ConfigReq;
2293 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2294 *(uint16_t *) (q + 2) = htons(10); // packet length
2295 q[4] = 3; // ip address option
2296 q[5] = 6; // option length
2297 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2298 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2299 my_address; // send my IP
2300
2301 tunnelsend(buf, 10 + (q - buf), t); // send it
2302 restart_timer(s, ipcp);
2303 }
2304
2305 void sendipv6cp(sessionidt s, tunnelidt t)
2306 {
2307 uint8_t buf[MAXETHER];
2308 uint8_t *q;
2309
2310 CSTAT(sendipv6cp);
2311 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2312
2313 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2314 if (!q) return;
2315
2316 *q = ConfigReq;
2317 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2318 // only send one type
2319 // of request
2320 *(uint16_t *) (q + 2) = htons(14);
2321 q[4] = 1; // interface identifier option
2322 q[5] = 10; // option length
2323 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2324 *(uint32_t *) (q + 10) = 0;
2325 q[13] = 1;
2326
2327 tunnelsend(buf, 14 + (q - buf), t); // send it
2328 restart_timer(s, ipv6cp);
2329 }
2330
2331 static void sessionclear(sessionidt s)
2332 {
2333 memset(&session[s], 0, sizeof(session[s]));
2334 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2335 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2336
2337 session[s].tunnel = T_FREE; // Mark it as free.
2338 session[s].next = sessionfree;
2339 sessionfree = s;
2340 }
2341
2342 // kill a session now
2343 void sessionkill(sessionidt s, char *reason)
2344 {
2345 CSTAT(sessionkill);
2346
2347 if (!session[s].opened) // not alive
2348 return;
2349
2350 if (session[s].next)
2351 {
2352 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2353 return;
2354 }
2355
2356 if (!session[s].die)
2357 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2358
2359 if (sess_local[s].radius)
2360 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2361
2362 if (session[s].forwardtosession)
2363 {
2364 sessionidt sess = session[s].forwardtosession;
2365 if (session[sess].forwardtosession == s)
2366 {
2367 // Shutdown the linked session also.
2368 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2369 }
2370 }
2371
2372 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2373 sessionclear(s);
2374 cluster_send_session(s);
2375 }
2376
2377 static void tunnelclear(tunnelidt t)
2378 {
2379 if (!t) return;
2380 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2381 tunnel[t].state = TUNNELFREE;
2382 }
2383
2384 static void bundleclear(bundleidt b)
2385 {
2386 if (!b) return;
2387 memset(&bundle[b], 0, sizeof(bundle[b]));
2388 bundle[b].state = BUNDLEFREE;
2389 }
2390
2391 // kill a tunnel now
2392 static void tunnelkill(tunnelidt t, char *reason)
2393 {
2394 sessionidt s;
2395 controlt *c;
2396
2397 CSTAT(tunnelkill);
2398
2399 tunnel[t].state = TUNNELDIE;
2400
2401 // free control messages
2402 while ((c = tunnel[t].controls))
2403 {
2404 controlt * n = c->next;
2405 tunnel[t].controls = n;
2406 tunnel[t].controlc--;
2407 c->next = controlfree;
2408 controlfree = c;
2409 }
2410 // kill sessions
2411 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2412 if (session[s].tunnel == t)
2413 sessionkill(s, reason);
2414
2415 // free tunnel
2416 tunnelclear(t);
2417 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2418 cli_tunnel_actions[t].action = 0;
2419 cluster_send_tunnel(t);
2420 }
2421
2422 // shut down a tunnel cleanly
2423 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2424 {
2425 sessionidt s;
2426
2427 CSTAT(tunnelshutdown);
2428
2429 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2430 {
2431 // never set up, can immediately kill
2432 tunnelkill(t, reason);
2433 return;
2434 }
2435 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2436
2437 // close session
2438 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2439 if (session[s].tunnel == t)
2440 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2441
2442 tunnel[t].state = TUNNELDIE;
2443 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2444 cluster_send_tunnel(t);
2445 // TBA - should we wait for sessions to stop?
2446 if (result)
2447 {
2448 controlt *c = controlnew(4); // sending StopCCN
2449 if (error)
2450 {
2451 uint16_t buf[32];
2452 int l = 4;
2453 buf[0] = htons(result);
2454 buf[1] = htons(error);
2455 if (msg)
2456 {
2457 int m = strlen(msg);
2458 if (m + 4 > sizeof(buf))
2459 m = sizeof(buf) - 4;
2460
2461 memcpy(buf+2, msg, m);
2462 l += m;
2463 }
2464
2465 controlb(c, 1, (uint8_t *)buf, l, 1);
2466 }
2467 else
2468 control16(c, 1, result, 1);
2469
2470 control16(c, 9, t, 1); // assigned tunnel (our end)
2471 controladd(c, 0, t); // send the message
2472 }
2473 }
2474
2475 // read and process packet on tunnel (UDP)
2476 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2477 {
2478 uint8_t *sendchalresponse = NULL;
2479 uint8_t *recvchalresponse = NULL;
2480 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2481 uint8_t *p = buf + 2;
2482
2483
2484 CSTAT(processudp);
2485
2486 udp_rx += len;
2487 udp_rx_pkt++;
2488 LOG_HEX(5, "UDP Data", buf, len);
2489 STAT(tunnel_rx_packets);
2490 INC_STAT(tunnel_rx_bytes, len);
2491 if (len < 6)
2492 {
2493 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2494 STAT(tunnel_rx_errors);
2495 return;
2496 }
2497 if ((buf[1] & 0x0F) != 2)
2498 {
2499 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2500 STAT(tunnel_rx_errors);
2501 return;
2502 }
2503 if (*buf & 0x40)
2504 { // length
2505 l = ntohs(*(uint16_t *) p);
2506 p += 2;
2507 }
2508 t = ntohs(*(uint16_t *) p);
2509 p += 2;
2510 s = ntohs(*(uint16_t *) p);
2511 p += 2;
2512 if (s >= MAXSESSION)
2513 {
2514 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2515 STAT(tunnel_rx_errors);
2516 return;
2517 }
2518 if (t >= MAXTUNNEL)
2519 {
2520 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2521 STAT(tunnel_rx_errors);
2522 return;
2523 }
2524 if (t == TUNNEL_ID_PPPOE)
2525 {
2526 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2527 STAT(tunnel_rx_errors);
2528 return;
2529 }
2530 if (*buf & 0x08)
2531 { // ns/nr
2532 ns = ntohs(*(uint16_t *) p);
2533 p += 2;
2534 nr = ntohs(*(uint16_t *) p);
2535 p += 2;
2536 }
2537 if (*buf & 0x02)
2538 { // offset
2539 uint16_t o = ntohs(*(uint16_t *) p);
2540 p += o + 2;
2541 }
2542 if ((p - buf) > l)
2543 {
2544 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2545 STAT(tunnel_rx_errors);
2546 return;
2547 }
2548 l -= (p - buf);
2549
2550 // used to time out old tunnels
2551 if (t && tunnel[t].state == TUNNELOPEN)
2552 tunnel[t].lastrec = time_now;
2553
2554 if (*buf & 0x80)
2555 { // control
2556 uint16_t message = 0xFFFF; // message type
2557 uint8_t fatal = 0;
2558 uint8_t mandatory = 0;
2559 uint16_t asession = 0; // assigned session
2560 uint32_t amagic = 0; // magic number
2561 uint8_t aflags = 0; // flags from last LCF
2562 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2563 char called[MAXTEL] = ""; // called number
2564 char calling[MAXTEL] = ""; // calling number
2565
2566 if (!config->cluster_iam_master)
2567 {
2568 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2569 return;
2570 }
2571
2572 // control messages must have bits 0x80|0x40|0x08
2573 // (type, length and sequence) set, and bits 0x02|0x01
2574 // (offset and priority) clear
2575 if ((*buf & 0xCB) != 0xC8)
2576 {
2577 LOG(1, s, t, "Bad control header %02X\n", *buf);
2578 STAT(tunnel_rx_errors);
2579 return;
2580 }
2581
2582 // check for duplicate tunnel open message
2583 if (!t && ns == 0)
2584 {
2585 int i;
2586
2587 //
2588 // Is this a duplicate of the first packet? (SCCRQ)
2589 //
2590 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2591 {
2592 if (tunnel[i].state != TUNNELOPENING ||
2593 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2594 tunnel[i].port != ntohs(addr->sin_port) )
2595 continue;
2596 t = i;
2597 LOG(3, s, t, "Duplicate SCCRQ?\n");
2598 break;
2599 }
2600 }
2601
2602 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2603 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2604
2605 // if no tunnel specified, assign one
2606 if (!t)
2607 {
2608 if (!(t = new_tunnel()))
2609 {
2610 LOG(1, 0, 0, "No more tunnels\n");
2611 STAT(tunnel_overflow);
2612 return;
2613 }
2614 tunnelclear(t);
2615 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2616 tunnel[t].port = ntohs(addr->sin_port);
2617 tunnel[t].window = 4; // default window
2618 tunnel[t].indexudp = indexudpfd;
2619 STAT(tunnel_created);
2620 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2621 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2622 }
2623
2624 // If the 'ns' just received is not the 'nr' we're
2625 // expecting, just send an ack and drop it.
2626 //
2627 // if 'ns' is less, then we got a retransmitted packet.
2628 // if 'ns' is greater than missed a packet. Either way
2629 // we should ignore it.
2630 if (ns != tunnel[t].nr)
2631 {
2632 // is this the sequence we were expecting?
2633 STAT(tunnel_rx_errors);
2634 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2635 t, ns, tunnel[t].nr);
2636
2637 if (l) // Is this not a ZLB?
2638 controlnull(t);
2639 return;
2640 }
2641
2642 // check sequence of this message
2643 {
2644 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2645 // some to clear maybe?
2646 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2647 {
2648 controlt *c = tunnel[t].controls;
2649 tunnel[t].controls = c->next;
2650 tunnel[t].controlc--;
2651 c->next = controlfree;
2652 controlfree = c;
2653 skip--;
2654 tunnel[t].try = 0; // we have progress
2655 }
2656
2657 // receiver advance (do here so quoted correctly in any sends below)
2658 if (l) tunnel[t].nr = (ns + 1);
2659 if (skip < 0) skip = 0;
2660 if (skip < tunnel[t].controlc)
2661 {
2662 // some control packets can now be sent that were previous stuck out of window
2663 int tosend = tunnel[t].window - skip;
2664 controlt *c = tunnel[t].controls;
2665 while (c && skip)
2666 {
2667 c = c->next;
2668 skip--;
2669 }
2670 while (c && tosend)
2671 {
2672 tunnel[t].try = 0; // first send
2673 tunnelsend(c->buf, c->length, t);
2674 c = c->next;
2675 tosend--;
2676 }
2677 }
2678 if (!tunnel[t].controlc)
2679 tunnel[t].retry = 0; // caught up
2680 }
2681 if (l)
2682 { // if not a null message
2683 int result = 0;
2684 int error = 0;
2685 char *msg = 0;
2686
2687 // Default disconnect cause/message on receipt of CDN. Set to
2688 // more specific value from attribute 1 (result code) or 46
2689 // (disconnect cause) if present below.
2690 int disc_cause_set = 0;
2691 int disc_cause = TERM_NAS_REQUEST;
2692 char const *disc_reason = "Closed (Received CDN).";
2693
2694 // process AVPs
2695 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2696 {
2697 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2698 uint8_t *b = p;
2699 uint8_t flags = *p;
2700 uint16_t mtype;
2701
2702 if (n > l)
2703 {
2704 LOG(1, s, t, "Invalid length in AVP\n");
2705 STAT(tunnel_rx_errors);
2706 return;
2707 }
2708 p += n; // next
2709 l -= n;
2710 if (flags & 0x3C) // reserved bits, should be clear
2711 {
2712 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2713 fatal = flags;
2714 result = 2; // general error
2715 error = 3; // reserved field non-zero
2716 msg = 0;
2717 continue; // next
2718 }
2719 b += 2;
2720 if (*(uint16_t *) (b))
2721 {
2722 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2723 fatal = flags;
2724 result = 2; // general error
2725 error = 6; // generic vendor-specific error
2726 msg = "unsupported vendor-specific";
2727 continue; // next
2728 }
2729 b += 2;
2730 mtype = ntohs(*(uint16_t *) (b));
2731 b += 2;
2732 n -= 6;
2733
2734 if (flags & 0x40)
2735 {
2736 uint16_t orig_len;
2737
2738 // handle hidden AVPs
2739 if (!*config->l2tp_secret)
2740 {
2741 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2742 fatal = flags;
2743 result = 2; // general error
2744 error = 6; // generic vendor-specific error
2745 msg = "secret not specified";
2746 continue;
2747 }
2748 if (!session[s].random_vector_length)
2749 {
2750 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2751 fatal = flags;
2752 result = 2; // general error
2753 error = 6; // generic
2754 msg = "no random vector";
2755 continue;
2756 }
2757 if (n < 8)
2758 {
2759 LOG(2, s, t, "Short hidden AVP.\n");
2760 fatal = flags;
2761 result = 2; // general error
2762 error = 2; // length is wrong
2763 msg = 0;
2764 continue;
2765 }
2766
2767 // Unhide the AVP
2768 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2769
2770 orig_len = ntohs(*(uint16_t *) b);
2771 if (orig_len > n + 2)
2772 {
2773 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2774 orig_len, n);
2775
2776 fatal = flags;
2777 result = 2; // general error
2778 error = 2; // length is wrong
2779 msg = 0;
2780 continue;
2781 }
2782
2783 b += 2;
2784 n = orig_len;
2785 }
2786
2787 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2788 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2789
2790 switch (mtype)
2791 {
2792 case 0: // message type
2793 message = ntohs(*(uint16_t *) b);
2794 mandatory = flags & 0x80;
2795 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2796 break;
2797 case 1: // result code
2798 {
2799 uint16_t rescode = ntohs(*(uint16_t *) b);
2800 char const *resdesc = "(unknown)";
2801 char const *errdesc = NULL;
2802 int cause = 0;
2803
2804 if (message == 4)
2805 { /* StopCCN */
2806 resdesc = l2tp_stopccn_result_code(rescode);
2807 cause = TERM_LOST_SERVICE;
2808 }
2809 else if (message == 14)
2810 { /* CDN */
2811 resdesc = l2tp_cdn_result_code(rescode);
2812 if (rescode == 1)
2813 cause = TERM_LOST_CARRIER;
2814 else
2815 cause = TERM_ADMIN_RESET;
2816 }
2817
2818 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2819 if (n >= 4)
2820 {
2821 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2822 errdesc = l2tp_error_code(errcode);
2823 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2824 }
2825 if (n > 4)
2826 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2827
2828 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2829 {
2830 disc_cause_set = mtype;
2831 disc_reason = errdesc ? errdesc : resdesc;
2832 disc_cause = cause;
2833 }
2834
2835 break;
2836 }
2837 break;
2838 case 2: // protocol version
2839 {
2840 version = ntohs(*(uint16_t *) (b));
2841 LOG(4, s, t, " Protocol version = %u\n", version);
2842 if (version && version != 0x0100)
2843 { // allow 0.0 and 1.0
2844 LOG(1, s, t, " Bad protocol version %04X\n", version);
2845 fatal = flags;
2846 result = 5; // unspported protocol version
2847 error = 0x0100; // supported version
2848 msg = 0;
2849 continue; // next
2850 }
2851 }
2852 break;
2853 case 3: // framing capabilities
2854 break;
2855 case 4: // bearer capabilities
2856 break;
2857 case 5: // tie breaker
2858 // We never open tunnels, so we don't care about tie breakers
2859 continue;
2860 case 6: // firmware revision
2861 break;
2862 case 7: // host name
2863 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2864 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2865 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2866 // TBA - to send to RADIUS
2867 break;
2868 case 8: // vendor name
2869 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2870 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2871 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2872 break;
2873 case 9: // assigned tunnel
2874 tunnel[t].far = ntohs(*(uint16_t *) (b));
2875 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2876 break;
2877 case 10: // rx window
2878 tunnel[t].window = ntohs(*(uint16_t *) (b));
2879 if (!tunnel[t].window)
2880 tunnel[t].window = 1; // window of 0 is silly
2881 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2882 break;
2883 case 11: // Request Challenge
2884 {
2885 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2886 if (message == 1)
2887 build_chap_response(b, 2, n, &sendchalresponse);
2888 else if (message == 2)
2889 build_chap_response(b, 3, n, &sendchalresponse);
2890 }
2891 break;
2892 case 13: // receive challenge Response
2893 if (tunnel[t].isremotelns)
2894 {
2895 recvchalresponse = calloc(17, 1);
2896 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2897 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2898 }
2899 else
2900 // Why did they send a response? We never challenge.
2901 LOG(2, s, t, " received unexpected challenge response\n");
2902 break;
2903
2904 case 14: // assigned session
2905 asession = session[s].far = ntohs(*(uint16_t *) (b));
2906 LOG(4, s, t, " assigned session = %u\n", asession);
2907 break;
2908 case 15: // call serial number
2909 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2910 break;
2911 case 18: // bearer type
2912 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2913 // TBA - for RADIUS
2914 break;
2915 case 19: // framing type
2916 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2917 // TBA
2918 break;
2919 case 21: // called number
2920 memset(called, 0, sizeof(called));
2921 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2922 LOG(4, s, t, " Called <%s>\n", called);
2923 break;
2924 case 22: // calling number
2925 memset(calling, 0, sizeof(calling));
2926 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2927 LOG(4, s, t, " Calling <%s>\n", calling);
2928 break;
2929 case 23: // subtype
2930 break;
2931 case 24: // tx connect speed
2932 if (n == 4)
2933 {
2934 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2935 }
2936 else
2937 {
2938 // AS5300s send connect speed as a string
2939 char tmp[30];
2940 memset(tmp, 0, sizeof(tmp));
2941 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2942 session[s].tx_connect_speed = atol(tmp);
2943 }
2944 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2945 break;
2946 case 38: // rx connect speed
2947 if (n == 4)
2948 {
2949 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2950 }
2951 else
2952 {
2953 // AS5300s send connect speed as a string
2954 char tmp[30];
2955 memset(tmp, 0, sizeof(tmp));
2956 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2957 session[s].rx_connect_speed = atol(tmp);
2958 }
2959 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2960 break;
2961 case 25: // Physical Channel ID
2962 {
2963 uint32_t tmp = ntohl(*(uint32_t *) b);
2964 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2965 break;
2966 }
2967 case 29: // Proxy Authentication Type
2968 {
2969 uint16_t atype = ntohs(*(uint16_t *)b);
2970 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2971 break;
2972 }
2973 case 30: // Proxy Authentication Name
2974 {
2975 char authname[64];
2976 memset(authname, 0, sizeof(authname));
2977 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2978 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2979 authname);
2980 break;
2981 }
2982 case 31: // Proxy Authentication Challenge
2983 {
2984 LOG(4, s, t, " Proxy Auth Challenge\n");
2985 break;
2986 }
2987 case 32: // Proxy Authentication ID
2988 {
2989 uint16_t authid = ntohs(*(uint16_t *)(b));
2990 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2991 break;
2992 }
2993 case 33: // Proxy Authentication Response
2994 LOG(4, s, t, " Proxy Auth Response\n");
2995 break;
2996 case 27: // last sent lcp
2997 { // find magic number
2998 uint8_t *p = b, *e = p + n;
2999 while (p + 1 < e && p[1] && p + p[1] <= e)
3000 {
3001 if (*p == 5 && p[1] == 6) // Magic-Number
3002 amagic = ntohl(*(uint32_t *) (p + 2));
3003 else if (*p == 7) // Protocol-Field-Compression
3004 aflags |= SESSION_PFC;
3005 else if (*p == 8) // Address-and-Control-Field-Compression
3006 aflags |= SESSION_ACFC;
3007 p += p[1];
3008 }
3009 }
3010 break;
3011 case 28: // last recv lcp confreq
3012 break;
3013 case 26: // Initial Received LCP CONFREQ
3014 break;
3015 case 39: // seq required - we control it as an LNS anyway...
3016 break;
3017 case 36: // Random Vector
3018 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
3019 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
3020 if (n > sizeof(session[s].random_vector))
3021 n = sizeof(session[s].random_vector);
3022 memcpy(session[s].random_vector, b, n);
3023 session[s].random_vector_length = n;
3024 break;
3025 case 46: // ppp disconnect cause
3026 if (n >= 5)
3027 {
3028 uint16_t code = ntohs(*(uint16_t *) b);
3029 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
3030 uint8_t dir = *(b + 4);
3031
3032 LOG(4, s, t, " PPP disconnect cause "
3033 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3034 code, proto, dir, n - 5, b + 5);
3035
3036 disc_cause_set = mtype;
3037
3038 switch (code)
3039 {
3040 case 1: // admin disconnect
3041 disc_cause = TERM_ADMIN_RESET;
3042 disc_reason = "Administrative disconnect";
3043 break;
3044 case 3: // lcp terminate
3045 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
3046 disc_cause = TERM_USER_REQUEST;
3047 disc_reason = "Normal disconnection";
3048 break;
3049 case 4: // compulsory encryption unavailable
3050 if (dir != 1) break; // 1=refused by peer, 2=local
3051 disc_cause = TERM_USER_ERROR;
3052 disc_reason = "Compulsory encryption refused";
3053 break;
3054 case 5: // lcp: fsm timeout
3055 disc_cause = TERM_PORT_ERROR;
3056 disc_reason = "LCP: FSM timeout";
3057 break;
3058 case 6: // lcp: no recognisable lcp packets received
3059 disc_cause = TERM_PORT_ERROR;
3060 disc_reason = "LCP: no recognisable LCP packets";
3061 break;
3062 case 7: // lcp: magic-no error (possibly looped back)
3063 disc_cause = TERM_PORT_ERROR;
3064 disc_reason = "LCP: magic-no error (possible loop)";
3065 break;
3066 case 8: // lcp: echo request timeout
3067 disc_cause = TERM_PORT_ERROR;
3068 disc_reason = "LCP: echo request timeout";
3069 break;
3070 case 13: // auth: fsm timeout
3071 disc_cause = TERM_SERVICE_UNAVAILABLE;
3072 disc_reason = "Authentication: FSM timeout";
3073 break;
3074 case 15: // auth: unacceptable auth protocol
3075 disc_cause = TERM_SERVICE_UNAVAILABLE;
3076 disc_reason = "Unacceptable authentication protocol";
3077 break;
3078 case 16: // auth: authentication failed
3079 disc_cause = TERM_SERVICE_UNAVAILABLE;
3080 disc_reason = "Authentication failed";
3081 break;
3082 case 17: // ncp: fsm timeout
3083 disc_cause = TERM_SERVICE_UNAVAILABLE;
3084 disc_reason = "NCP: FSM timeout";
3085 break;
3086 case 18: // ncp: no ncps available
3087 disc_cause = TERM_SERVICE_UNAVAILABLE;
3088 disc_reason = "NCP: no NCPs available";
3089 break;
3090 case 19: // ncp: failure to converge on acceptable address
3091 disc_cause = TERM_SERVICE_UNAVAILABLE;
3092 disc_reason = (dir == 1)
3093 ? "NCP: too many Configure-Naks received from peer"
3094 : "NCP: too many Configure-Naks sent to peer";
3095 break;
3096 case 20: // ncp: user not permitted to use any address
3097 disc_cause = TERM_SERVICE_UNAVAILABLE;
3098 disc_reason = (dir == 1)
3099 ? "NCP: local link address not acceptable to peer"
3100 : "NCP: remote link address not acceptable";
3101 break;
3102 }
3103 }
3104 break;
3105 default:
3106 {
3107 static char e[] = "unknown AVP 0xXXXX";
3108 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3109 fatal = flags;
3110 result = 2; // general error
3111 error = 8; // unknown mandatory AVP
3112 sprintf((msg = e) + 14, "%04x", mtype);
3113 continue; // next
3114 }
3115 }
3116 }
3117 // process message
3118 if (fatal & 0x80)
3119 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3120 else
3121 switch (message)
3122 {
3123 case 1: // SCCRQ - Start Control Connection Request
3124 tunnel[t].state = TUNNELOPENING;
3125 LOG(3, s, t, "Received SCCRQ\n");
3126 if (main_quit != QUIT_SHUTDOWN)
3127 {
3128 LOG(3, s, t, "sending SCCRP\n");
3129 controlt *c = controlnew(2); // sending SCCRP
3130 control16(c, 2, version, 1); // protocol version
3131 control32(c, 3, 3, 1); // framing
3132 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3133 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3134 control16(c, 9, t, 1); // assigned tunnel
3135 controladd(c, 0, t); // send the resply
3136 }
3137 else
3138 {
3139 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3140 }
3141 break;
3142 case 2: // SCCRP
3143 tunnel[t].state = TUNNELOPEN;
3144 tunnel[t].lastrec = time_now;
3145 LOG(3, s, t, "Received SCCRP\n");
3146 if (main_quit != QUIT_SHUTDOWN)
3147 {
3148 if (tunnel[t].isremotelns && recvchalresponse)
3149 {
3150 hasht hash;
3151
3152 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3153 // check authenticator
3154 if (memcmp(hash, recvchalresponse, 16) == 0)
3155 {
3156 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3157 controlt *c = controlnew(3); // sending SCCCN
3158 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3159 controls(c, 8, Vendor_name, 1); // Vendor name
3160 control16(c, 2, version, 1); // protocol version
3161 control32(c, 3, 3, 1); // framing Capabilities
3162 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3163 control16(c, 9, t, 1); // assigned tunnel
3164 controladd(c, 0, t); // send
3165 }
3166 else
3167 {
3168 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3169 }
3170 }
3171 }
3172 else
3173 {
3174 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3175 }
3176 break;
3177 case 3: // SCCN
3178 LOG(3, s, t, "Received SCCN\n");
3179 tunnel[t].state = TUNNELOPEN;
3180 tunnel[t].lastrec = time_now;
3181 controlnull(t); // ack
3182 break;
3183 case 4: // StopCCN
3184 LOG(3, s, t, "Received StopCCN\n");
3185 controlnull(t); // ack
3186 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3187 break;
3188 case 6: // HELLO
3189 LOG(3, s, t, "Received HELLO\n");
3190 controlnull(t); // simply ACK
3191 break;
3192 case 7: // OCRQ
3193 // TBA
3194 LOG(3, s, t, "Received OCRQ\n");
3195 break;
3196 case 8: // OCRO
3197 // TBA
3198 LOG(3, s, t, "Received OCRO\n");
3199 break;
3200 case 9: // OCCN
3201 // TBA
3202 LOG(3, s, t, "Received OCCN\n");
3203 break;
3204 case 10: // ICRQ
3205 LOG(3, s, t, "Received ICRQ\n");
3206 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3207 {
3208 controlt *c = controlnew(11); // ICRP
3209
3210 LOG(3, s, t, "Sending ICRP\n");
3211
3212 s = sessionfree;
3213 sessionfree = session[s].next;
3214 memset(&session[s], 0, sizeof(session[s]));
3215
3216 if (s > config->cluster_highest_sessionid)
3217 config->cluster_highest_sessionid = s;
3218
3219 session[s].opened = time_now;
3220 session[s].tunnel = t;
3221 session[s].far = asession;
3222 session[s].last_packet = session[s].last_data = time_now;
3223 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3224 control16(c, 14, s, 1); // assigned session
3225 controladd(c, asession, t); // send the reply
3226
3227 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3228 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3229
3230 session[s].ppp.phase = Establish;
3231 session[s].ppp.lcp = Starting;
3232
3233 STAT(session_created);
3234 break;
3235 }
3236
3237 {
3238 controlt *c = controlnew(14); // CDN
3239 LOG(3, s, t, "Sending CDN\n");
3240 if (!sessionfree)
3241 {
3242 STAT(session_overflow);
3243 LOG(1, 0, t, "No free sessions\n");
3244 control16(c, 1, 4, 0); // temporary lack of resources
3245 }
3246 else
3247 control16(c, 1, 2, 7); // shutting down, try another
3248
3249 controladd(c, asession, t); // send the message
3250 }
3251 return;
3252 case 11: // ICRP
3253 LOG(3, s, t, "Received ICRP\n");
3254 if (session[s].forwardtosession)
3255 {
3256 controlt *c = controlnew(12); // ICCN
3257
3258 session[s].opened = time_now;
3259 session[s].tunnel = t;
3260 session[s].far = asession;
3261 session[s].last_packet = session[s].last_data = time_now;
3262
3263 control32(c, 19, 1, 1); // Framing Type
3264 control32(c, 24, 10000000, 1); // Tx Connect Speed
3265 controladd(c, asession, t); // send the message
3266 LOG(3, s, t, "Sending ICCN\n");
3267 }
3268 break;
3269 case 12: // ICCN
3270 LOG(3, s, t, "Received ICCN\n");
3271 if (amagic == 0) amagic = time_now;
3272 session[s].magic = amagic; // set magic number
3273 session[s].flags = aflags; // set flags received
3274 session[s].mru = PPPoE_MRU; // default
3275 controlnull(t); // ack
3276
3277 // start LCP
3278 sess_local[s].lcp_authtype = config->radius_authprefer;
3279 sess_local[s].ppp_mru = MRU;
3280
3281 // Set multilink options before sending initial LCP packet
3282 sess_local[s].mp_mrru = 1614;
3283 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3284
3285 sendlcp(s, t);
3286 change_state(s, lcp, RequestSent);
3287 break;
3288
3289 case 14: // CDN
3290 LOG(3, s, t, "Received CDN\n");
3291 controlnull(t); // ack
3292 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3293 break;
3294 case 0xFFFF:
3295 LOG(1, s, t, "Missing message type\n");
3296 break;
3297 default:
3298 STAT(tunnel_rx_errors);
3299 if (mandatory)
3300 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3301 else
3302 LOG(1, s, t, "Unknown message type %u\n", message);
3303 break;
3304 }
3305 if (sendchalresponse) free(sendchalresponse);
3306 if (recvchalresponse) free(recvchalresponse);
3307 cluster_send_tunnel(t);
3308 }
3309 else
3310 {
3311 LOG(4, s, t, " Got a ZLB ack\n");
3312 }
3313 }
3314 else
3315 { // data
3316 uint16_t proto;
3317
3318 LOG_HEX(5, "Receive Tunnel Data", p, l);
3319 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3320 { // HDLC address header, discard
3321 p += 2;
3322 l -= 2;
3323 }
3324 if (l < 2)
3325 {
3326 LOG(1, s, t, "Short ppp length %d\n", l);
3327 STAT(tunnel_rx_errors);
3328 return;
3329 }
3330 if (*p & 1)
3331 {
3332 proto = *p++;
3333 l--;
3334 }
3335 else
3336 {
3337 proto = ntohs(*(uint16_t *) p);
3338 p += 2;
3339 l -= 2;
3340 }
3341
3342 if (session[s].forwardtosession)
3343 {
3344 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3345 // Forward to LAC/BAS or Remote LNS session
3346 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3347 return;
3348 }
3349 else if (config->auth_tunnel_change_addr_src)
3350 {
3351 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3352 tunnel[t].port == ntohs(addr->sin_port))
3353 {
3354 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3355 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3356 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3357
3358 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3359 }
3360 }
3361
3362 if (s && !session[s].opened) // Is something wrong??
3363 {
3364 if (!config->cluster_iam_master)
3365 {
3366 // Pass it off to the master to deal with..
3367 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3368 return;
3369 }
3370
3371 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3372 STAT(tunnel_rx_errors);
3373 return;
3374 }
3375
3376 if (proto == PPPPAP)
3377 {
3378 session[s].last_packet = time_now;
3379 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3380 processpap(s, t, p, l);
3381 }
3382 else if (proto == PPPCHAP)
3383 {
3384 session[s].last_packet = time_now;
3385 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3386 processchap(s, t, p, l);
3387 }
3388 else if (proto == PPPLCP)
3389 {
3390 session[s].last_packet = time_now;
3391 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3392 processlcp(s, t, p, l);
3393 }
3394 else if (proto == PPPIPCP)
3395 {
3396 session[s].last_packet = time_now;
3397 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3398 processipcp(s, t, p, l);
3399 }
3400 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3401 {
3402 session[s].last_packet = time_now;
3403 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3404 processipv6cp(s, t, p, l);
3405 }
3406 else if (proto == PPPCCP)
3407 {
3408 session[s].last_packet = time_now;
3409 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3410 processccp(s, t, p, l);
3411 }
3412 else if (proto == PPPIP)
3413 {
3414 if (session[s].die)
3415 {
3416 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3417 return; // closing session, PPP not processed
3418 }
3419
3420 session[s].last_packet = session[s].last_data = time_now;
3421 if (session[s].walled_garden && !config->cluster_iam_master)
3422 {
3423 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3424 return;
3425 }
3426
3427 processipin(s, t, p, l);
3428 }
3429 else if (proto == PPPMP)
3430 {
3431 if (session[s].die)
3432 {
3433 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3434 return; // closing session, PPP not processed
3435 }
3436
3437 session[s].last_packet = session[s].last_data = time_now;
3438 if (!config->cluster_iam_master)
3439 {
3440 // The fragments reconstruction is managed by the Master.
3441 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3442 return;
3443 }
3444
3445 processmpin(s, t, p, l);
3446 }
3447 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3448 {
3449 if (session[s].die)
3450 {
3451 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3452 return; // closing session, PPP not processed
3453 }
3454
3455 session[s].last_packet = session[s].last_data = time_now;
3456 if (session[s].walled_garden && !config->cluster_iam_master)
3457 {
3458 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3459 return;
3460 }
3461
3462 if (!config->cluster_iam_master)
3463 {
3464 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
3465 if (*(p + 6) == 17 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
3466 *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
3467 *(uint16_t *)(p + 34) == 0 && *(p + 36) == 0 && *(p + 37) == 1 && *(p + 38) == 0 && *(p + 39) == 2 &&
3468 *(p + 40) == 2 && *(p + 41) == 0x22 && *(p + 42) == 2 && *(p + 43) == 0x23)
3469 {
3470 // DHCPV6 must be managed by the Master.
3471 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3472 return;
3473 }
3474 }
3475
3476 processipv6in(s, t, p, l);
3477 }
3478 else if (session[s].ppp.lcp == Opened)
3479 {
3480 session[s].last_packet = time_now;
3481 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3482 protoreject(s, t, p, l, proto);
3483 }
3484 else
3485 {
3486 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3487 proto, ppp_state(session[s].ppp.lcp));
3488 }
3489 }
3490 }
3491
3492 // read and process packet on tun
3493 // (i.e. this routine writes to buf[-8]).
3494 static void processtun(uint8_t * buf, int len)
3495 {
3496 LOG_HEX(5, "Receive TUN Data", buf, len);
3497 STAT(tun_rx_packets);
3498 INC_STAT(tun_rx_bytes, len);
3499
3500 CSTAT(processtun);
3501
3502 eth_rx_pkt++;
3503 eth_rx += len;
3504 if (len < 22)
3505 {
3506 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3507 STAT(tun_rx_errors);
3508 return;
3509 }
3510
3511 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3512 processipout(buf, len);
3513 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3514 && config->ipv6_prefix.s6_addr[0])
3515 processipv6out(buf, len);
3516
3517 // Else discard.
3518 }
3519
3520 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3521 // that we look at the whole of the tunnel, radius and session tables
3522 // every second
3523 static void regular_cleanups(double period)
3524 {
3525 // Next tunnel, radius and session to check for actions on.
3526 static tunnelidt t = 0;
3527 static int r = 0;
3528 static sessionidt s = 0;
3529
3530 int t_actions = 0;
3531 int r_actions = 0;
3532 int s_actions = 0;
3533
3534 int t_slice;
3535 int r_slice;
3536 int s_slice;
3537
3538 int i;
3539 int a;
3540
3541 // divide up tables into slices based on the last run
3542 t_slice = config->cluster_highest_tunnelid * period;
3543 r_slice = (MAXRADIUS - 1) * period;
3544 s_slice = config->cluster_highest_sessionid * period;
3545
3546 if (t_slice < 1)
3547 t_slice = 1;
3548 else if (t_slice > config->cluster_highest_tunnelid)
3549 t_slice = config->cluster_highest_tunnelid;
3550
3551 if (r_slice < 1)
3552 r_slice = 1;
3553 else if (r_slice > (MAXRADIUS - 1))
3554 r_slice = MAXRADIUS - 1;
3555
3556 if (s_slice < 1)
3557 s_slice = 1;
3558 else if (s_slice > config->cluster_highest_sessionid)
3559 s_slice = config->cluster_highest_sessionid;
3560
3561 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3562
3563 for (i = 0; i < t_slice; i++)
3564 {
3565 t++;
3566 if (t > config->cluster_highest_tunnelid)
3567 t = 1;
3568
3569 if (t == TUNNEL_ID_PPPOE)
3570 continue;
3571
3572 // check for expired tunnels
3573 if (tunnel[t].die && tunnel[t].die <= TIME)
3574 {
3575 STAT(tunnel_timeout);
3576 tunnelkill(t, "Expired");
3577 t_actions++;
3578 continue;
3579 }
3580 // check for message resend
3581 if (tunnel[t].retry && tunnel[t].controlc)
3582 {
3583 // resend pending messages as timeout on reply
3584 if (tunnel[t].retry <= TIME)
3585 {
3586 controlt *c = tunnel[t].controls;
3587 uint16_t w = tunnel[t].window;
3588 tunnel[t].try++; // another try
3589 if (tunnel[t].try > 5)
3590 tunnelkill(t, "Timeout on control message"); // game over
3591 else
3592 while (c && w--)
3593 {
3594 tunnelsend(c->buf, c->length, t);
3595 c = c->next;
3596 }
3597
3598 t_actions++;
3599 }
3600 }
3601 // Send hello
3602 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3603 {
3604 if (!config->disable_sending_hello)
3605 {
3606 controlt *c = controlnew(6); // sending HELLO
3607 controladd(c, 0, t); // send the message
3608 LOG(3, 0, t, "Sending HELLO message\n");
3609 t_actions++;
3610 }
3611 }
3612
3613 // Check for tunnel changes requested from the CLI
3614 if ((a = cli_tunnel_actions[t].action))
3615 {
3616 cli_tunnel_actions[t].action = 0;
3617 if (a & CLI_TUN_KILL)
3618 {
3619 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3620 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3621 t_actions++;
3622 }
3623 }
3624 }
3625
3626 for (i = 0; i < r_slice; i++)
3627 {
3628 r++;
3629 if (r >= MAXRADIUS)
3630 r = 1;
3631
3632 if (!radius[r].state)
3633 continue;
3634
3635 if (radius[r].retry <= TIME)
3636 {
3637 radiusretry(r);
3638 r_actions++;
3639 }
3640 }
3641
3642 for (i = 0; i < s_slice; i++)
3643 {
3644 s++;
3645 if (s > config->cluster_highest_sessionid)
3646 s = 1;
3647
3648 if (!session[s].opened) // Session isn't in use
3649 continue;
3650
3651 // check for expired sessions
3652 if (session[s].die)
3653 {
3654 if (session[s].die <= TIME)
3655 {
3656 sessionkill(s, "Expired");
3657 s_actions++;
3658 }
3659 continue;
3660 }
3661
3662 // PPP timeouts
3663 if (sess_local[s].lcp.restart <= time_now)
3664 {
3665 int next_state = session[s].ppp.lcp;
3666 switch (session[s].ppp.lcp)
3667 {
3668 case RequestSent:
3669 case AckReceived:
3670 next_state = RequestSent;
3671
3672 case AckSent:
3673 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3674 {
3675 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3676 sendlcp(s, session[s].tunnel);
3677 change_state(s, lcp, next_state);
3678 }
3679 else
3680 {
3681 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3682 STAT(session_timeout);
3683 }
3684
3685 s_actions++;
3686 }
3687
3688 if (session[s].die)
3689 continue;
3690 }
3691
3692 if (sess_local[s].ipcp.restart <= time_now)
3693 {
3694 int next_state = session[s].ppp.ipcp;
3695 switch (session[s].ppp.ipcp)
3696 {
3697 case RequestSent:
3698 case AckReceived:
3699 next_state = RequestSent;
3700
3701 case AckSent:
3702 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3703 {
3704 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3705 sendipcp(s, session[s].tunnel);
3706 change_state(s, ipcp, next_state);
3707 }
3708 else
3709 {
3710 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3711 STAT(session_timeout);
3712 }
3713
3714 s_actions++;
3715 }
3716
3717 if (session[s].die)
3718 continue;
3719 }
3720
3721 if (sess_local[s].ipv6cp.restart <= time_now)
3722 {
3723 int next_state = session[s].ppp.ipv6cp;
3724 switch (session[s].ppp.ipv6cp)
3725 {
3726 case RequestSent:
3727 case AckReceived:
3728 next_state = RequestSent;
3729
3730 case AckSent:
3731 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3732 {
3733 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3734 sendipv6cp(s, session[s].tunnel);
3735 change_state(s, ipv6cp, next_state);
3736 }
3737 else
3738 {
3739 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3740 change_state(s, ipv6cp, Stopped);
3741 }
3742
3743 s_actions++;
3744 }
3745 }
3746
3747 if (sess_local[s].ccp.restart <= time_now)
3748 {
3749 int next_state = session[s].ppp.ccp;
3750 switch (session[s].ppp.ccp)
3751 {
3752 case RequestSent:
3753 case AckReceived:
3754 next_state = RequestSent;
3755
3756 case AckSent:
3757 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3758 {
3759 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3760 sendccp(s, session[s].tunnel);
3761 change_state(s, ccp, next_state);
3762 }
3763 else
3764 {
3765 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3766 change_state(s, ccp, Stopped);
3767 }
3768
3769 s_actions++;
3770 }
3771 }
3772
3773 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3774 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3775 {
3776 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3777 STAT(session_timeout);
3778 s_actions++;
3779 continue;
3780 }
3781
3782 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3783 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3784 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3785 {
3786 uint8_t b[MAXETHER];
3787
3788 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3789 if (!q) continue;
3790
3791 *q = EchoReq;
3792 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3793 *(uint16_t *)(q + 2) = htons(8); // Length
3794 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3795
3796 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3797 (int)(time_now - session[s].last_packet));
3798
3799 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3800 sess_local[s].last_echo = time_now;
3801 s_actions++;
3802 }
3803
3804 // Drop sessions who have reached session_timeout seconds
3805 if (session[s].session_timeout)
3806 {
3807 bundleidt bid = session[s].bundle;
3808 if (bid)
3809 {
3810 if (time_now - bundle[bid].last_check >= 1)
3811 {
3812 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3813 bundle[bid].last_check = time_now;
3814 if (bundle[bid].online_time >= session[s].session_timeout)
3815 {
3816 int ses;
3817 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3818 {
3819 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3820 s_actions++;
3821 continue;
3822 }
3823 }
3824 }
3825 }
3826 else if (time_now - session[s].opened >= session[s].session_timeout)
3827 {
3828 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3829 s_actions++;
3830 continue;
3831 }
3832 }
3833
3834 // Drop sessions who have reached idle_timeout seconds
3835 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3836 {
3837 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3838 STAT(session_timeout);
3839 s_actions++;
3840 continue;
3841 }
3842
3843 // Check for actions requested from the CLI
3844 if ((a = cli_session_actions[s].action))
3845 {
3846 int send = 0;
3847
3848 cli_session_actions[s].action = 0;
3849 if (a & CLI_SESS_KILL)
3850 {
3851 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3852 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3853 a = 0; // dead, no need to check for other actions
3854 s_actions++;
3855 }
3856
3857 if (a & CLI_SESS_NOSNOOP)
3858 {
3859 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3860 session[s].snoop_ip = 0;
3861 session[s].snoop_port = 0;
3862 s_actions++;
3863 send++;
3864 }
3865 else if (a & CLI_SESS_SNOOP)
3866 {
3867 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3868 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3869 cli_session_actions[s].snoop_port);
3870
3871 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3872 session[s].snoop_port = cli_session_actions[s].snoop_port;
3873 s_actions++;
3874 send++;
3875 }
3876
3877 if (a & CLI_SESS_NOTHROTTLE)
3878 {
3879 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3880 throttle_session(s, 0, 0);
3881 s_actions++;
3882 send++;
3883 }
3884 else if (a & CLI_SESS_THROTTLE)
3885 {
3886 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3887 cli_session_actions[s].throttle_in,
3888 cli_session_actions[s].throttle_out);
3889
3890 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3891 s_actions++;
3892 send++;
3893 }
3894
3895 if (a & CLI_SESS_NOFILTER)
3896 {
3897 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3898 filter_session(s, 0, 0);
3899 s_actions++;
3900 send++;
3901 }
3902 else if (a & CLI_SESS_FILTER)
3903 {
3904 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3905 cli_session_actions[s].filter_in,
3906 cli_session_actions[s].filter_out);
3907
3908 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3909 s_actions++;
3910 send++;
3911 }
3912
3913 if (send)
3914 cluster_send_session(s);
3915 }
3916
3917 // RADIUS interim accounting
3918 if (config->radius_accounting && config->radius_interim > 0
3919 && session[s].ip && !session[s].walled_garden
3920 && !sess_local[s].radius // RADIUS already in progress
3921 && time_now - sess_local[s].last_interim >= config->radius_interim
3922 && session[s].flags & SESSION_STARTED)
3923 {
3924 int rad = radiusnew(s);
3925 if (!rad)
3926 {
3927 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3928 STAT(radius_overflow);
3929 continue;
3930 }
3931
3932 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3933 session[s].user, session[s].unique_id);
3934
3935 radiussend(rad, RADIUSINTERIM);
3936 sess_local[s].last_interim = time_now;
3937 s_actions++;
3938 }
3939 }
3940
3941 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3942 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3943 }
3944
3945 //
3946 // Are we in the middle of a tunnel update, or radius
3947 // requests??
3948 //
3949 static int still_busy(void)
3950 {
3951 int i;
3952 static clockt last_talked = 0;
3953 static clockt start_busy_wait = 0;
3954
3955 #ifdef BGP
3956 static time_t stopped_bgp = 0;
3957 if (bgp_configured)
3958 {
3959 if (!stopped_bgp)
3960 {
3961 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3962
3963 for (i = 0; i < BGP_NUM_PEERS; i++)
3964 if (bgp_peers[i].state == Established)
3965 bgp_stop(&bgp_peers[i]);
3966
3967 stopped_bgp = time_now;
3968
3969 if (!config->cluster_iam_master)
3970 {
3971 // we don't want to become master
3972 cluster_send_ping(0);
3973
3974 return 1;
3975 }
3976 }
3977
3978 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3979 return 1;
3980 }
3981 #endif /* BGP */
3982
3983 if (!config->cluster_iam_master)
3984 return 0;
3985
3986 if (main_quit == QUIT_SHUTDOWN)
3987 {
3988 static int dropped = 0;
3989 if (!dropped)
3990 {
3991 int i;
3992
3993 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3994 for (i = 1; i < MAXTUNNEL; i++)
3995 if (tunnel[i].ip || tunnel[i].state)
3996 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3997
3998 dropped = 1;
3999 }
4000 }
4001
4002 if (start_busy_wait == 0)
4003 start_busy_wait = TIME;
4004
4005 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
4006 {
4007 if (!tunnel[i].controlc)
4008 continue;
4009
4010 if (last_talked != TIME)
4011 {
4012 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
4013 last_talked = TIME;
4014 }
4015 return 1;
4016 }
4017
4018 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
4019 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
4020 {
4021 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
4022 return 0;
4023 }
4024
4025 for (i = 1; i < MAXRADIUS; i++)
4026 {
4027 if (radius[i].state == RADIUSNULL)
4028 continue;
4029 if (radius[i].state == RADIUSWAIT)
4030 continue;
4031
4032 if (last_talked != TIME)
4033 {
4034 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
4035 last_talked = TIME;
4036 }
4037 return 1;
4038 }
4039
4040 return 0;
4041 }
4042
4043 #ifdef HAVE_EPOLL
4044 # include <sys/epoll.h>
4045 #else
4046 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4047 # include "fake_epoll.h"
4048 #endif
4049
4050 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4051 #define BASE_FDS (9 + MAX_UDPFD)
4052
4053 // additional polled fds
4054 #ifdef BGP
4055 # define EXTRA_FDS BGP_NUM_PEERS
4056 #else
4057 # define EXTRA_FDS 0
4058 #endif
4059
4060 // main loop - gets packets on tun or udp and processes them
4061 static void mainloop(void)
4062 {
4063 int i, j;
4064 uint8_t buf[65536];
4065 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4066 // and the forwarded pppoe session
4067 int size_bufp = sizeof(buf) - 32;
4068 clockt next_cluster_ping = 0; // send initial ping immediately
4069 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4070 int maxevent = sizeof(events)/sizeof(*events);
4071
4072 if ((epollfd = epoll_create(maxevent)) < 0)
4073 {
4074 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4075 exit(1);
4076 }
4077
4078 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, pppoefd=%d, pppoesessfd=%d\n",
4079 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4080
4081 /* setup our fds to poll for input */
4082 {
4083 static struct event_data d[BASE_FDS];
4084 struct epoll_event e;
4085
4086 e.events = EPOLLIN;
4087 i = 0;
4088
4089 if (clifd >= 0)
4090 {
4091 d[i].type = FD_TYPE_CLI;
4092 e.data.ptr = &d[i++];
4093 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4094 }
4095
4096 d[i].type = FD_TYPE_CLUSTER;
4097 e.data.ptr = &d[i++];
4098 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4099
4100 d[i].type = FD_TYPE_TUN;
4101 e.data.ptr = &d[i++];
4102 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4103
4104 d[i].type = FD_TYPE_CONTROL;
4105 e.data.ptr = &d[i++];
4106 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4107
4108 d[i].type = FD_TYPE_DAE;
4109 e.data.ptr = &d[i++];
4110 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4111
4112 d[i].type = FD_TYPE_NETLINK;
4113 e.data.ptr = &d[i++];
4114 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4115
4116 d[i].type = FD_TYPE_PPPOEDISC;
4117 e.data.ptr = &d[i++];
4118 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4119
4120 d[i].type = FD_TYPE_PPPOESESS;
4121 e.data.ptr = &d[i++];
4122 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4123
4124 for (j = 0; j < config->nbudpfd; j++)
4125 {
4126 d[i].type = FD_TYPE_UDP;
4127 d[i].index = j;
4128 e.data.ptr = &d[i++];
4129 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4130 }
4131 }
4132
4133 #ifdef BGP
4134 signal(SIGPIPE, SIG_IGN);
4135 bgp_setup(config->as_number);
4136 if (config->bind_address)
4137 bgp_add_route(config->bind_address, 0xffffffff);
4138
4139 for (i = 0; i < BGP_NUM_PEERS; i++)
4140 {
4141 if (config->neighbour[i].name[0])
4142 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4143 config->neighbour[i].as, config->neighbour[i].keepalive,
4144 config->neighbour[i].hold, config->neighbour[i].update_source,
4145 0); /* 0 = routing disabled */
4146 }
4147 #endif /* BGP */
4148
4149 while (!main_quit || still_busy())
4150 {
4151 int more = 0;
4152 int n;
4153
4154
4155 if (main_reload)
4156 {
4157 main_reload = 0;
4158 read_config_file();
4159 config->reload_config++;
4160 }
4161
4162 if (config->reload_config)
4163 {
4164 config->reload_config = 0;
4165 update_config();
4166 }
4167
4168 #ifdef BGP
4169 bgp_set_poll();
4170 #endif /* BGP */
4171
4172 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4173 STAT(select_called);
4174
4175 TIME = now(NULL);
4176 if (n < 0)
4177 {
4178 if (errno == EINTR ||
4179 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4180 continue;
4181
4182 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4183 break; // exit
4184 }
4185
4186 if (n)
4187 {
4188 struct sockaddr_in addr;
4189 struct in_addr local;
4190 socklen_t alen;
4191 int c, s;
4192 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4193 int pppoesess_ready = 0;
4194 int pppoesess_pkts = 0;
4195 int tun_ready = 0;
4196 int cluster_ready = 0;
4197 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4198 int tun_pkts = 0;
4199 int cluster_pkts = 0;
4200 #ifdef BGP
4201 uint32_t bgp_events[BGP_NUM_PEERS];
4202 memset(bgp_events, 0, sizeof(bgp_events));
4203 #endif /* BGP */
4204
4205 for (c = n, i = 0; i < c; i++)
4206 {
4207 struct event_data *d = events[i].data.ptr;
4208
4209 switch (d->type)
4210 {
4211 case FD_TYPE_CLI: // CLI connections
4212 {
4213 int cli;
4214
4215 alen = sizeof(addr);
4216 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4217 {
4218 cli_do(cli);
4219 close(cli);
4220 }
4221 else
4222 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4223
4224 n--;
4225 break;
4226 }
4227
4228 // these are handled below, with multiple interleaved reads
4229 case FD_TYPE_CLUSTER: cluster_ready++; break;
4230 case FD_TYPE_TUN: tun_ready++; break;
4231 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4232 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4233
4234 case FD_TYPE_PPPOEDISC: // pppoe discovery
4235 s = read(pppoediscfd, p, size_bufp);
4236 if (s > 0) process_pppoe_disc(p, s);
4237 n--;
4238 break;
4239
4240 case FD_TYPE_CONTROL: // nsctl commands
4241 alen = sizeof(addr);
4242 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4243 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4244 n--;
4245 break;
4246
4247 case FD_TYPE_DAE: // DAE requests
4248 alen = sizeof(addr);
4249 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4250 if (s > 0) processdae(p, s, &addr, alen, &local);
4251 n--;
4252 break;
4253
4254 case FD_TYPE_RADIUS: // RADIUS response
4255 alen = sizeof(addr);
4256 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4257 if (s >= 0 && config->cluster_iam_master)
4258 {
4259 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4260 addr.sin_addr.s_addr == config->radiusserver[1])
4261 processrad(p, s, d->index);
4262 else
4263 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4264 fmtaddr(addr.sin_addr.s_addr, 0));
4265 }
4266
4267 n--;
4268 break;
4269
4270 #ifdef BGP
4271 case FD_TYPE_BGP:
4272 bgp_events[d->index] = events[i].events;
4273 n--;
4274 break;
4275 #endif /* BGP */
4276
4277 case FD_TYPE_NETLINK:
4278 {
4279 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4280 s = netlink_recv(p, size_bufp);
4281 if (nh->nlmsg_type == NLMSG_ERROR)
4282 {
4283 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4284 if (errmsg->error)
4285 {
4286 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4287 {
4288 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4289 exit(1);
4290 }
4291 else
4292 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4293 }
4294 // else it's a ack
4295 }
4296 else
4297 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);
4298 n--;
4299 break;
4300 }
4301
4302 default:
4303 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4304 }
4305 }
4306
4307 #ifdef BGP
4308 bgp_process(bgp_events);
4309 #endif /* BGP */
4310
4311 for (c = 0; n && c < config->multi_read_count; c++)
4312 {
4313 for (j = 0; j < config->nbudpfd; j++)
4314 {
4315 // L2TP and L2TP REMOTE LNS
4316 if (udp_ready[j])
4317 {
4318 alen = sizeof(addr);
4319 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4320 {
4321 processudp(p, s, &addr, j);
4322 udp_pkts[j]++;
4323 }
4324 else
4325 {
4326 udp_ready[j] = 0;
4327 n--;
4328 }
4329 }
4330 }
4331
4332 // incoming IP
4333 if (tun_ready)
4334 {
4335 if ((s = read(tunfd, p, size_bufp)) > 0)
4336 {
4337 processtun(p, s);
4338 tun_pkts++;
4339 }
4340 else
4341 {
4342 tun_ready = 0;
4343 n--;
4344 }
4345 }
4346
4347 // pppoe session
4348 if (pppoesess_ready)
4349 {
4350 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4351 {
4352 process_pppoe_sess(p, s);
4353 pppoesess_pkts++;
4354 }
4355 else
4356 {
4357 pppoesess_ready = 0;
4358 n--;
4359 }
4360 }
4361
4362 // cluster
4363 if (cluster_ready)
4364 {
4365 alen = sizeof(addr);
4366 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4367 {
4368 processcluster(p, s, addr.sin_addr.s_addr);
4369 cluster_pkts++;
4370 }
4371 else
4372 {
4373 cluster_ready = 0;
4374 n--;
4375 }
4376 }
4377 }
4378
4379 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4380 STAT(multi_read_used);
4381
4382 if (c >= config->multi_read_count)
4383 {
4384 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4385 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4386 STAT(multi_read_exceeded);
4387 more++;
4388 }
4389 }
4390 #ifdef BGP
4391 else
4392 /* no event received, but timers could still have expired */
4393 bgp_process_peers_timers();
4394 #endif /* BGP */
4395
4396 if (time_changed)
4397 {
4398 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4399
4400 // Log current traffic stats
4401 snprintf(config->bandwidth, sizeof(config->bandwidth),
4402 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4403 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4404 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4405 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4406
4407 udp_tx = udp_rx = 0;
4408 udp_rx_pkt = eth_rx_pkt = 0;
4409 eth_tx = eth_rx = 0;
4410 time_changed = 0;
4411
4412 if (config->dump_speed)
4413 printf("%s\n", config->bandwidth);
4414
4415 // Update the internal time counter
4416 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4417
4418 {
4419 // Run timer hooks
4420 struct param_timer p = { time_now };
4421 run_plugins(PLUGIN_TIMER, &p);
4422 }
4423 }
4424
4425 // Runs on every machine (master and slaves).
4426 if (next_cluster_ping <= TIME)
4427 {
4428 // Check to see which of the cluster is still alive..
4429
4430 cluster_send_ping(basetime); // Only does anything if we're a slave
4431 cluster_check_master(); // ditto.
4432
4433 cluster_heartbeat(); // Only does anything if we're a master.
4434 cluster_check_slaves(); // ditto.
4435
4436 master_update_counts(); // If we're a slave, send our byte counters to our master.
4437
4438 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4439 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4440 else
4441 next_cluster_ping = TIME + config->cluster_hb_interval;
4442 }
4443
4444 if (!config->cluster_iam_master)
4445 continue;
4446
4447 // Run token bucket filtering queue..
4448 // Only run it every 1/10th of a second.
4449 {
4450 static clockt last_run = 0;
4451 if (last_run != TIME)
4452 {
4453 last_run = TIME;
4454 tbf_run_timer();
4455 }
4456 }
4457
4458 // Handle timeouts, retries etc.
4459 {
4460 static double last_clean = 0;
4461 double this_clean;
4462 double diff;
4463
4464 TIME = now(&this_clean);
4465 diff = this_clean - last_clean;
4466
4467 // Run during idle time (after we've handled
4468 // all incoming packets) or every 1/10th sec
4469 if (!more || diff > 0.1)
4470 {
4471 regular_cleanups(diff);
4472 last_clean = this_clean;
4473 }
4474 }
4475
4476 if (*config->accounting_dir)
4477 {
4478 static clockt next_acct = 0;
4479 static clockt next_shut_acct = 0;
4480
4481 if (next_acct <= TIME)
4482 {
4483 // Dump accounting data
4484 next_acct = TIME + ACCT_TIME;
4485 next_shut_acct = TIME + ACCT_SHUT_TIME;
4486 dump_acct_info(1);
4487 }
4488 else if (next_shut_acct <= TIME)
4489 {
4490 // Dump accounting data for shutdown sessions
4491 next_shut_acct = TIME + ACCT_SHUT_TIME;
4492 if (shut_acct_n)
4493 dump_acct_info(0);
4494 }
4495 }
4496 }
4497
4498 // Are we the master and shutting down??
4499 if (config->cluster_iam_master)
4500 cluster_heartbeat(); // Flush any queued changes..
4501
4502 // Ok. Notify everyone we're shutting down. If we're
4503 // the master, this will force an election.
4504 cluster_send_ping(0);
4505
4506 //
4507 // Important!!! We MUST not process any packets past this point!
4508 LOG(1, 0, 0, "Shutdown complete\n");
4509 }
4510
4511 static void stripdomain(char *host)
4512 {
4513 char *p;
4514
4515 if ((p = strchr(host, '.')))
4516 {
4517 char *domain = 0;
4518 char _domain[1024];
4519
4520 // strip off domain
4521 FILE *resolv = fopen("/etc/resolv.conf", "r");
4522 if (resolv)
4523 {
4524 char buf[1024];
4525 char *b;
4526
4527 while (fgets(buf, sizeof(buf), resolv))
4528 {
4529 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4530 continue;
4531
4532 if (!isspace(buf[6]))
4533 continue;
4534
4535 b = buf + 7;
4536 while (isspace(*b)) b++;
4537
4538 if (*b)
4539 {
4540 char *d = b;
4541 while (*b && !isspace(*b)) b++;
4542 *b = 0;
4543 if (buf[0] == 'd') // domain is canonical
4544 {
4545 domain = d;
4546 break;
4547 }
4548
4549 // first search line
4550 if (!domain)
4551 {
4552 // hold, may be subsequent domain line
4553 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4554 domain = _domain;
4555 }
4556 }
4557 }
4558
4559 fclose(resolv);
4560 }
4561
4562 if (domain)
4563 {
4564 int hl = strlen(host);
4565 int dl = strlen(domain);
4566 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4567 host[hl -dl - 1] = 0;
4568 }
4569 else
4570 {
4571 *p = 0; // everything after first dot
4572 }
4573 }
4574 }
4575
4576 // Init data structures
4577 static void initdata(int optdebug, char *optconfig)
4578 {
4579 int i;
4580
4581 if (!(config = shared_malloc(sizeof(configt))))
4582 {
4583 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4584 exit(1);
4585 }
4586
4587 memset(config, 0, sizeof(configt));
4588 time(&config->start_time);
4589 strncpy(config->config_file, optconfig, strlen(optconfig));
4590 config->debug = optdebug;
4591 config->num_tbfs = MAXTBFS;
4592 config->rl_rate = 28; // 28kbps
4593 config->cluster_mcast_ttl = 1;
4594 config->cluster_master_min_adv = 1;
4595 config->ppp_restart_time = 3;
4596 config->ppp_max_configure = 10;
4597 config->ppp_max_failure = 5;
4598 config->kill_timedout_sessions = 1;
4599 strcpy(config->random_device, RANDOMDEVICE);
4600 // Set default value echo_timeout and idle_echo_timeout
4601 config->echo_timeout = ECHO_TIMEOUT;
4602 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4603 // Set default RDNSS lifetime
4604 config->dns6_lifetime = 1200;
4605
4606 log_stream = stderr;
4607
4608 #ifdef RINGBUFFER
4609 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4610 {
4611 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4612 exit(1);
4613 }
4614 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4615 #endif
4616
4617 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4618 {
4619 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4620 exit(1);
4621 }
4622 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4623 {
4624 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4625 exit(1);
4626 }
4627 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4628 {
4629 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4630 exit(1);
4631 }
4632 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4633 {
4634 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4635 exit(1);
4636 }
4637 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4638 {
4639 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4640 exit(1);
4641 }
4642
4643 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4644 {
4645 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4646 exit(1);
4647 }
4648
4649 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4650 {
4651 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4652 exit(1);
4653 }
4654
4655 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4656 {
4657 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4658 exit(1);
4659 }
4660
4661 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4662 {
4663 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4664 exit(1);
4665 }
4666 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4667
4668 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4669 {
4670 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4671 exit(1);
4672 }
4673 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4674
4675 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4676 {
4677 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4678 exit(1);
4679 }
4680 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4681
4682 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4683 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4684 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4685 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4686 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4687
4688 // Put all the sessions on the free list marked as undefined.
4689 for (i = 1; i < MAXSESSION; i++)
4690 {
4691 session[i].next = i + 1;
4692 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4693 }
4694 session[MAXSESSION - 1].next = 0;
4695 sessionfree = 1;
4696
4697 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4698 for (i = 1; i < MAXTUNNEL; i++)
4699 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4700
4701 for (i = 1; i < MAXBUNDLE; i++) {
4702 bundle[i].state = BUNDLEUNDEF;
4703 }
4704
4705 if (!*hostname)
4706 {
4707 // Grab my hostname unless it's been specified
4708 gethostname(hostname, sizeof(hostname));
4709 stripdomain(hostname);
4710 }
4711
4712 _statistics->start_time = _statistics->last_reset = time(NULL);
4713
4714 #ifdef BGP
4715 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4716 {
4717 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4718 exit(1);
4719 }
4720 #endif /* BGP */
4721
4722 lac_initremotelnsdata();
4723 }
4724
4725 static int assign_ip_address(sessionidt s)
4726 {
4727 uint32_t i;
4728 int best = -1;
4729 time_t best_time = time_now;
4730 char *u = session[s].user;
4731 char reuse = 0;
4732
4733
4734 CSTAT(assign_ip_address);
4735
4736 for (i = 1; i < ip_pool_size; i++)
4737 {
4738 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4739 continue;
4740
4741 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4742 {
4743 best = i;
4744 reuse = 1;
4745 break;
4746 }
4747
4748 if (ip_address_pool[i].last < best_time)
4749 {
4750 best = i;
4751 if (!(best_time = ip_address_pool[i].last))
4752 break; // never used, grab this one
4753 }
4754 }
4755
4756 if (best < 0)
4757 {
4758 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4759 return 0;
4760 }
4761
4762 session[s].ip = ip_address_pool[best].address;
4763 session[s].ip_pool_index = best;
4764 ip_address_pool[best].assigned = 1;
4765 ip_address_pool[best].last = time_now;
4766 ip_address_pool[best].session = s;
4767 if (session[s].walled_garden)
4768 /* Don't track addresses of users in walled garden (note: this
4769 means that their address isn't "sticky" even if they get
4770 un-gardened). */
4771 ip_address_pool[best].user[0] = 0;
4772 else
4773 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4774
4775 STAT(ip_allocated);
4776 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4777 reuse ? "Reusing" : "Allocating", best);
4778
4779 return 1;
4780 }
4781
4782 static void free_ip_address(sessionidt s)
4783 {
4784 int i = session[s].ip_pool_index;
4785
4786
4787 CSTAT(free_ip_address);
4788
4789 if (!session[s].ip)
4790 return; // what the?
4791
4792 if (i < 0) // Is this actually part of the ip pool?
4793 i = 0;
4794
4795 STAT(ip_freed);
4796 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4797 session[s].ip = 0;
4798 ip_address_pool[i].assigned = 0;
4799 ip_address_pool[i].session = 0;
4800 ip_address_pool[i].last = time_now;
4801 }
4802
4803 //
4804 // Fsck the address pool against the session table.
4805 // Normally only called when we become a master.
4806 //
4807 // This isn't perfect: We aren't keep tracking of which
4808 // users used to have an IP address.
4809 //
4810 void rebuild_address_pool(void)
4811 {
4812 int i;
4813
4814 //
4815 // Zero the IP pool allocation, and build
4816 // a map from IP address to pool index.
4817 for (i = 1; i < MAXIPPOOL; ++i)
4818 {
4819 ip_address_pool[i].assigned = 0;
4820 ip_address_pool[i].session = 0;
4821 if (!ip_address_pool[i].address)
4822 continue;
4823
4824 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4825 }
4826
4827 for (i = 0; i < MAXSESSION; ++i)
4828 {
4829 int ipid;
4830 if (!(session[i].opened && session[i].ip))
4831 continue;
4832
4833 ipid = - lookup_ipmap(htonl(session[i].ip));
4834
4835 if (session[i].ip_pool_index < 0)
4836 {
4837 // Not allocated out of the pool.
4838 if (ipid < 1) // Not found in the pool either? good.
4839 continue;
4840
4841 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4842 i, fmtaddr(session[i].ip, 0), ipid);
4843
4844 // Fall through and process it as part of the pool.
4845 }
4846
4847
4848 if (ipid > MAXIPPOOL || ipid < 0)
4849 {
4850 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4851 ipid = -1;
4852 session[i].ip_pool_index = ipid;
4853 continue;
4854 }
4855
4856 ip_address_pool[ipid].assigned = 1;
4857 ip_address_pool[ipid].session = i;
4858 ip_address_pool[ipid].last = time_now;
4859 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4860 session[i].ip_pool_index = ipid;
4861 cache_ipmap(session[i].ip, i); // Fix the ip map.
4862 }
4863 }
4864
4865 //
4866 // Fix the address pool to match a changed session.
4867 // (usually when the master sends us an update).
4868 static void fix_address_pool(int sid)
4869 {
4870 int ipid;
4871
4872 ipid = session[sid].ip_pool_index;
4873
4874 if (ipid > ip_pool_size)
4875 return; // Ignore it. rebuild_address_pool will fix it up.
4876
4877 if (ip_address_pool[ipid].address != session[sid].ip)
4878 return; // Just ignore it. rebuild_address_pool will take care of it.
4879
4880 ip_address_pool[ipid].assigned = 1;
4881 ip_address_pool[ipid].session = sid;
4882 ip_address_pool[ipid].last = time_now;
4883 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4884 }
4885
4886 //
4887 // Add a block of addresses to the IP pool to hand out.
4888 //
4889 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4890 {
4891 int i;
4892 if (prefixlen == 0)
4893 prefixlen = 32; // Host route only.
4894
4895 addr &= 0xffffffff << (32 - prefixlen);
4896
4897 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4898 return ;
4899
4900 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4901 {
4902 if ((i & 0xff) == 0 || (i&0xff) == 255)
4903 continue; // Skip 0 and broadcast addresses.
4904
4905 ip_address_pool[ip_pool_size].address = i;
4906 ip_address_pool[ip_pool_size].assigned = 0;
4907 ++ip_pool_size;
4908 if (ip_pool_size >= MAXIPPOOL)
4909 {
4910 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4911 return;
4912 }
4913 }
4914 }
4915
4916 // Initialize the IP address pool
4917 static void initippool()
4918 {
4919 FILE *f;
4920 char *p;
4921 char buf[4096];
4922 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4923
4924 if (!(f = fopen(IPPOOLFILE, "r")))
4925 {
4926 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4927 exit(1);
4928 }
4929
4930 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4931 {
4932 char *pool = buf;
4933 buf[4095] = 0; // Force it to be zero terminated/
4934
4935 if (*buf == '#' || *buf == '\n')
4936 continue; // Skip comments / blank lines
4937 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4938 if ((p = (char *)strchr(buf, ':')))
4939 {
4940 in_addr_t src;
4941 *p = '\0';
4942 src = inet_addr(buf);
4943 if (src == INADDR_NONE)
4944 {
4945 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4946 exit(1);
4947 }
4948 // This entry is for a specific IP only
4949 if (src != config->bind_address)
4950 continue;
4951 *p = ':';
4952 pool = p+1;
4953 }
4954 if ((p = (char *)strchr(pool, '/')))
4955 {
4956 // It's a range
4957 int numbits = 0;
4958 in_addr_t start = 0;
4959
4960 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4961 *p++ = 0;
4962 if (!*p || !(numbits = atoi(p)))
4963 {
4964 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4965 continue;
4966 }
4967 start = ntohl(inet_addr(pool));
4968
4969 // Add a static route for this pool
4970 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4971 fmtaddr(htonl(start), 0), numbits);
4972
4973 routeset(0, start, numbits, 0, 1);
4974
4975 add_to_ip_pool(start, numbits);
4976 }
4977 else
4978 {
4979 // It's a single ip address
4980 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4981 }
4982 }
4983 fclose(f);
4984 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4985 }
4986
4987 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4988 {
4989 struct sockaddr_in snoop_addr = {0};
4990 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4991 return;
4992
4993 snoop_addr.sin_family = AF_INET;
4994 snoop_addr.sin_addr.s_addr = destination;
4995 snoop_addr.sin_port = ntohs(port);
4996
4997 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4998 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4999 htons(snoop_addr.sin_port));
5000
5001 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
5002 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
5003
5004 STAT(packets_snooped);
5005 }
5006
5007 static int dump_session(FILE **f, sessiont *s)
5008 {
5009 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
5010 return 1;
5011
5012 if (!*f)
5013 {
5014 char filename[1024];
5015 char timestr[64];
5016 time_t now = time(NULL);
5017
5018 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
5019 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
5020
5021 if (!(*f = fopen(filename, "w")))
5022 {
5023 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
5024 return 0;
5025 }
5026
5027 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
5028 if(config->account_all_origin)
5029 {
5030 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
5031 "# host: %s\n"
5032 "# endpoint: %s\n"
5033 "# time: %ld\n"
5034 "# uptime: %ld\n"
5035 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
5036 hostname,
5037 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5038 now,
5039 now - basetime);
5040 }
5041 else
5042 {
5043 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
5044 "# host: %s\n"
5045 "# endpoint: %s\n"
5046 "# time: %ld\n"
5047 "# uptime: %ld\n"
5048 "# format: username ip qos uptxoctets downrxoctets\n",
5049 hostname,
5050 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5051 now,
5052 now - basetime);
5053 }
5054 }
5055
5056 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
5057 if(config->account_all_origin)
5058 {
5059 fprintf(*f, "%s %s %d %u %u %s\n",
5060 s->user, // username
5061 fmtaddr(htonl(s->ip), 0), // ip
5062 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5063 (uint32_t) s->cin_delta, // uptxoctets
5064 (uint32_t) s->cout_delta, // downrxoctets
5065 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
5066 }
5067 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
5068 {
5069 fprintf(*f, "%s %s %d %u %u\n",
5070 s->user, // username
5071 fmtaddr(htonl(s->ip), 0), // ip
5072 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5073 (uint32_t) s->cin_delta, // uptxoctets
5074 (uint32_t) s->cout_delta); // downrxoctets
5075 }
5076
5077 s->cin_delta = s->cout_delta = 0;
5078
5079 return 1;
5080 }
5081
5082 static void dump_acct_info(int all)
5083 {
5084 int i;
5085 FILE *f = NULL;
5086
5087
5088 CSTAT(dump_acct_info);
5089
5090 if (shut_acct_n)
5091 {
5092 for (i = 0; i < shut_acct_n; i++)
5093 dump_session(&f, &shut_acct[i]);
5094
5095 shut_acct_n = 0;
5096 }
5097
5098 if (all)
5099 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5100 dump_session(&f, &session[i]);
5101
5102 if (f)
5103 fclose(f);
5104 }
5105
5106 // Main program
5107 int main(int argc, char *argv[])
5108 {
5109 int i;
5110 int optdebug = 0;
5111 char *optconfig = CONFIGFILE;
5112
5113 time(&basetime); // start clock
5114
5115 // scan args
5116 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5117 {
5118 switch (i)
5119 {
5120 case 'd':
5121 if (fork()) exit(0);
5122 setsid();
5123 if(!freopen("/dev/null", "r", stdin)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno));
5124 if(!freopen("/dev/null", "w", stdout)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno));
5125 if(!freopen("/dev/null", "w", stderr)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno));
5126 break;
5127 case 'v':
5128 optdebug++;
5129 break;
5130 case 'c':
5131 optconfig = optarg;
5132 break;
5133 case 'h':
5134 snprintf(hostname, sizeof(hostname), "%s", optarg);
5135 break;
5136 default:
5137 printf("Args are:\n"
5138 "\t-d\t\tDetach from terminal\n"
5139 "\t-c <file>\tConfig file\n"
5140 "\t-h <hostname>\tForce hostname\n"
5141 "\t-v\t\tDebug\n");
5142
5143 return (0);
5144 break;
5145 }
5146 }
5147
5148 // Start the timer routine off
5149 time(&time_now);
5150 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5151
5152 initplugins();
5153 initdata(optdebug, optconfig);
5154
5155 init_cli();
5156 read_config_file();
5157 /* set hostname /after/ having read the config file */
5158 if (*config->hostname)
5159 strcpy(hostname, config->hostname);
5160 cli_init_complete(hostname);
5161 update_config();
5162 init_tbf(config->num_tbfs);
5163
5164 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5165 LOG(0, 0, 0, "Copyright (c) 2012, 2013, 2014 ISP FDN & SAMESWIRELESS\n");
5166 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5167 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5168 {
5169 struct rlimit rlim;
5170 rlim.rlim_cur = RLIM_INFINITY;
5171 rlim.rlim_max = RLIM_INFINITY;
5172 // Remove the maximum core size
5173 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5174 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5175
5176 // Make core dumps go to /tmp
5177 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno));
5178 }
5179
5180 if (config->scheduler_fifo)
5181 {
5182 int ret;
5183 struct sched_param params = {0};
5184 params.sched_priority = 1;
5185
5186 if (get_nprocs() < 2)
5187 {
5188 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5189 config->scheduler_fifo = 0;
5190 }
5191 else
5192 {
5193 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5194 {
5195 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5196 }
5197 else
5198 {
5199 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5200 config->scheduler_fifo = 0;
5201 }
5202 }
5203 }
5204
5205 initnetlink();
5206
5207 /* Set up the cluster communications port. */
5208 if (cluster_init() < 0)
5209 exit(1);
5210
5211 inittun();
5212 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5213
5214 if (*config->pppoe_if_to_bind)
5215 {
5216 init_pppoe();
5217 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5218 }
5219
5220 if (!config->nbmultiaddress)
5221 {
5222 config->bind_n_address[0] = config->bind_address;
5223 config->nbmultiaddress++;
5224 }
5225 config->nbudpfd = config->nbmultiaddress;
5226 for (i = 0; i < config->nbudpfd; i++)
5227 initudp(&udpfd[i], config->bind_n_address[i]);
5228 initlacudp();
5229 config->indexlacudpfd = config->nbudpfd;
5230 udpfd[config->indexlacudpfd] = udplacfd;
5231 config->nbudpfd++;
5232
5233 initcontrol();
5234 initdae();
5235
5236 // Intercept
5237 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5238
5239 initrad();
5240 initippool();
5241 dhcpv6_init();
5242
5243 // seed prng
5244 {
5245 unsigned seed = time_now ^ getpid();
5246 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5247 srand(seed);
5248 }
5249
5250 signal(SIGHUP, sighup_handler);
5251 signal(SIGCHLD, sigchild_handler);
5252 signal(SIGTERM, shutdown_handler);
5253 signal(SIGINT, shutdown_handler);
5254 signal(SIGQUIT, shutdown_handler);
5255
5256 // Prevent us from getting paged out
5257 if (config->lock_pages)
5258 {
5259 if (!mlockall(MCL_CURRENT))
5260 LOG(1, 0, 0, "Locking pages into memory\n");
5261 else
5262 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5263 }
5264
5265 mainloop();
5266
5267 /* remove plugins (so cleanup code gets run) */
5268 plugins_done();
5269
5270 // Remove the PID file if we wrote it
5271 if (config->wrote_pid && *config->pid_file == '/')
5272 unlink(config->pid_file);
5273
5274 /* kill CLI children */
5275 signal(SIGTERM, SIG_IGN);
5276 kill(0, SIGTERM);
5277 return 0;
5278 }
5279
5280 static void sighup_handler(int sig)
5281 {
5282 main_reload++;
5283 }
5284
5285 static void shutdown_handler(int sig)
5286 {
5287 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5288 }
5289
5290 static void sigchild_handler(int sig)
5291 {
5292 while (waitpid(-1, NULL, WNOHANG) > 0)
5293 ;
5294 }
5295
5296 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5297 {
5298 MD5_CTX ctx;
5299 *challenge_response = NULL;
5300
5301 if (!*config->l2tp_secret)
5302 {
5303 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5304 return;
5305 }
5306
5307 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5308
5309 *challenge_response = calloc(17, 1);
5310
5311 MD5_Init(&ctx);
5312 MD5_Update(&ctx, &id, 1);
5313 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5314 MD5_Update(&ctx, challenge, challenge_length);
5315 MD5_Final(*challenge_response, &ctx);
5316
5317 return;
5318 }
5319
5320 static int facility_value(char *name)
5321 {
5322 int i;
5323 for (i = 0; facilitynames[i].c_name; i++)
5324 {
5325 if (strcmp(facilitynames[i].c_name, name) == 0)
5326 return facilitynames[i].c_val;
5327 }
5328 return 0;
5329 }
5330
5331 static void update_config()
5332 {
5333 int i;
5334 char *p;
5335 static int timeout = 0;
5336 static int interval = 0;
5337
5338 // Update logging
5339 closelog();
5340 syslog_log = 0;
5341 if (log_stream)
5342 {
5343 if (log_stream != stderr)
5344 fclose(log_stream);
5345
5346 log_stream = NULL;
5347 }
5348
5349 if (*config->log_filename)
5350 {
5351 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5352 {
5353 char *p = config->log_filename + 7;
5354 if (*p)
5355 {
5356 openlog("l2tpns", LOG_PID, facility_value(p));
5357 syslog_log = 1;
5358 }
5359 }
5360 else if (strchr(config->log_filename, '/') == config->log_filename)
5361 {
5362 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5363 {
5364 fseek(log_stream, 0, SEEK_END);
5365 setbuf(log_stream, NULL);
5366 }
5367 else
5368 {
5369 log_stream = stderr;
5370 setbuf(log_stream, NULL);
5371 }
5372 }
5373 }
5374 else
5375 {
5376 log_stream = stderr;
5377 setbuf(log_stream, NULL);
5378 }
5379
5380 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5381 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5382
5383 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5384 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5385 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5386
5387 // reset MRU/MSS globals
5388 MRU = config->l2tp_mtu - L2TP_HDRS;
5389 if (MRU > PPPoE_MRU)
5390 MRU = PPPoE_MRU;
5391
5392 MSS = MRU - TCP_HDRS;
5393
5394 // Update radius
5395 config->numradiusservers = 0;
5396 for (i = 0; i < MAXRADSERVER; i++)
5397 if (config->radiusserver[i])
5398 {
5399 config->numradiusservers++;
5400 // Set radius port: if not set, take the port from the
5401 // first radius server. For the first radius server,
5402 // take the #defined default value from l2tpns.h
5403
5404 // test twice, In case someone works with
5405 // a secondary radius server without defining
5406 // a primary one, this will work even then.
5407 if (i > 0 && !config->radiusport[i])
5408 config->radiusport[i] = config->radiusport[i-1];
5409 if (!config->radiusport[i])
5410 config->radiusport[i] = RADPORT;
5411 }
5412
5413 if (!config->numradiusservers)
5414 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5415
5416 // parse radius_authtypes_s
5417 config->radius_authtypes = config->radius_authprefer = 0;
5418 p = config->radius_authtypes_s;
5419 while (p && *p)
5420 {
5421 char *s = strpbrk(p, " \t,");
5422 int type = 0;
5423
5424 if (s)
5425 {
5426 *s++ = 0;
5427 while (*s == ' ' || *s == '\t')
5428 s++;
5429
5430 if (!*s)
5431 s = 0;
5432 }
5433
5434 if (!strncasecmp("chap", p, strlen(p)))
5435 type = AUTHCHAP;
5436 else if (!strncasecmp("pap", p, strlen(p)))
5437 type = AUTHPAP;
5438 else
5439 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5440
5441 config->radius_authtypes |= type;
5442 if (!config->radius_authprefer)
5443 config->radius_authprefer = type;
5444
5445 p = s;
5446 }
5447
5448 if (!config->radius_authtypes)
5449 {
5450 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5451 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5452 }
5453
5454 // normalise radius_authtypes_s
5455 if (config->radius_authprefer == AUTHPAP)
5456 {
5457 strcpy(config->radius_authtypes_s, "pap");
5458 if (config->radius_authtypes & AUTHCHAP)
5459 strcat(config->radius_authtypes_s, ", chap");
5460 }
5461 else
5462 {
5463 strcpy(config->radius_authtypes_s, "chap");
5464 if (config->radius_authtypes & AUTHPAP)
5465 strcat(config->radius_authtypes_s, ", pap");
5466 }
5467
5468 if (!config->radius_dae_port)
5469 config->radius_dae_port = DAEPORT;
5470
5471 if(!config->bind_portremotelns)
5472 config->bind_portremotelns = L2TPLACPORT;
5473 if(!config->bind_address_remotelns)
5474 config->bind_address_remotelns = INADDR_ANY;
5475
5476 if (*config->bind_multi_address)
5477 {
5478 char *sip = config->bind_multi_address;
5479 char *n = sip;
5480 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5481 config->nbmultiaddress = 0;
5482
5483 while (*sip && (sip < e))
5484 {
5485 in_addr_t ip = 0;
5486 uint8_t u = 0;
5487
5488 while (n < e && (*n == ',' || *n == ' ')) n++;
5489
5490 while (n < e && (isdigit(*n) || *n == '.'))
5491 {
5492 if (*n == '.')
5493 {
5494 ip = (ip << 8) + u;
5495 u = 0;
5496 }
5497 else
5498 u = u * 10 + *n - '0';
5499 n++;
5500 }
5501 ip = (ip << 8) + u;
5502 n++;
5503
5504 if (ip)
5505 {
5506 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5507 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5508 config->nbmultiaddress++;
5509 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5510
5511 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5512 }
5513
5514 sip = n;
5515 }
5516
5517 if (config->nbmultiaddress >= 1)
5518 {
5519 config->bind_address = config->bind_n_address[0];
5520 config->iftun_address = config->bind_address;
5521 }
5522 }
5523
5524 if(!config->iftun_address)
5525 {
5526 config->iftun_address = config->bind_address;
5527 config->iftun_n_address[0] = config->iftun_address;
5528 }
5529
5530 if (*config->multi_hostname)
5531 {
5532 char *shost = config->multi_hostname;
5533 char *n = shost;
5534 char *e = config->multi_hostname + strlen(config->multi_hostname);
5535 config->nbmultihostname = 0;
5536
5537 while (*shost && (shost < e))
5538 {
5539 while ((n < e) && (*n == ' ' || *n == ',' || *n == '\t')) n++;
5540
5541 i = 0;
5542 while (n < e && (*n != ',') && (*n != '\t'))
5543 {
5544 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5545 n++;i++;
5546 }
5547
5548 if (i > 0)
5549 {
5550 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5551 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5552 config->nbmultihostname++;
5553 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5554 }
5555
5556 shost = n;
5557 }
5558
5559 if (config->nbmultihostname >= 1)
5560 {
5561 strcpy(hostname, config->multi_n_hostname[0]);
5562 strcpy(config->hostname, hostname);
5563 }
5564 }
5565
5566 if (!*config->pppoe_ac_name)
5567 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5568
5569 // re-initialise the random number source
5570 initrandom(config->random_device);
5571
5572 // Update plugins
5573 for (i = 0; i < MAXPLUGINS; i++)
5574 {
5575 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5576 continue;
5577
5578 if (*config->plugins[i])
5579 {
5580 // Plugin added
5581 add_plugin(config->plugins[i]);
5582 }
5583 else if (*config->old_plugins[i])
5584 {
5585 // Plugin removed
5586 remove_plugin(config->old_plugins[i]);
5587 }
5588 }
5589
5590 // Guest change
5591 guest_accounts_num = 0;
5592 char *p2 = config->guest_user;
5593 while (p2 && *p2)
5594 {
5595 char *s = strpbrk(p2, " \t,");
5596 if (s)
5597 {
5598 *s++ = 0;
5599 while (*s == ' ' || *s == '\t')
5600 s++;
5601
5602 if (!*s)
5603 s = 0;
5604 }
5605
5606 strcpy(guest_users[guest_accounts_num], p2);
5607 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5608 guest_accounts_num++;
5609 p2 = s;
5610 }
5611 // Rebuild the guest_user array
5612 strcpy(config->guest_user, "");
5613 int ui = 0;
5614 for (ui=0; ui<guest_accounts_num; ui++)
5615 {
5616 strcat(config->guest_user, guest_users[ui]);
5617 if (ui<guest_accounts_num-1)
5618 {
5619 strcat(config->guest_user, ",");
5620 }
5621 }
5622
5623
5624 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5625 if (!config->multi_read_count) config->multi_read_count = 10;
5626 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5627 if (!*config->cluster_interface)
5628 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5629
5630 if (!config->cluster_hb_interval)
5631 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5632
5633 if (!config->cluster_hb_timeout)
5634 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5635
5636 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5637 {
5638 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5639 // late, ensure we're sufficiently larger than that
5640 int t = 4 * config->cluster_hb_interval + 11;
5641
5642 if (config->cluster_hb_timeout < t)
5643 {
5644 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5645 config->cluster_hb_timeout = t;
5646 }
5647
5648 // Push timing changes to the slaves immediately if we're the master
5649 if (config->cluster_iam_master)
5650 cluster_heartbeat();
5651
5652 interval = config->cluster_hb_interval;
5653 timeout = config->cluster_hb_timeout;
5654 }
5655
5656 // Write PID file
5657 if (*config->pid_file == '/' && !config->wrote_pid)
5658 {
5659 FILE *f;
5660 if ((f = fopen(config->pid_file, "w")))
5661 {
5662 fprintf(f, "%d\n", getpid());
5663 fclose(f);
5664 config->wrote_pid = 1;
5665 }
5666 else
5667 {
5668 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5669 }
5670 }
5671 }
5672
5673 static void read_config_file()
5674 {
5675 FILE *f;
5676
5677 if (!config->config_file) return;
5678 if (!(f = fopen(config->config_file, "r")))
5679 {
5680 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5681 return;
5682 }
5683
5684 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5685 cli_do_file(f);
5686 LOG(3, 0, 0, "Done reading config file\n");
5687 fclose(f);
5688 }
5689
5690 int sessionsetup(sessionidt s, tunnelidt t)
5691 {
5692 // A session now exists, set it up
5693 in_addr_t ip;
5694 char *user;
5695 sessionidt i;
5696 int r;
5697
5698 CSTAT(sessionsetup);
5699
5700 LOG(3, s, t, "Doing session setup for session\n");
5701
5702 // Join a bundle if the MRRU option is accepted
5703 if(session[s].mrru > 0 && session[s].bundle == 0)
5704 {
5705 LOG(3, s, t, "This session can be part of multilink bundle\n");
5706 if (join_bundle(s) > 0)
5707 cluster_send_bundle(session[s].bundle);
5708 else
5709 {
5710 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5711 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5712 return 0;
5713 }
5714 }
5715
5716 if (!session[s].ip)
5717 {
5718 assign_ip_address(s);
5719 if (!session[s].ip)
5720 {
5721 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5722 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5723 return 0;
5724 }
5725 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5726 fmtaddr(htonl(session[s].ip), 0));
5727 }
5728
5729 // Make sure this is right
5730 session[s].tunnel = t;
5731
5732 // zap old sessions with same IP and/or username
5733 // Don't kill gardened sessions - doing so leads to a DoS
5734 // from someone who doesn't need to know the password
5735 {
5736 ip = session[s].ip;
5737 user = session[s].user;
5738 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5739 {
5740 if (i == s) continue;
5741 if (!session[s].opened) break;
5742 // Allow duplicate sessions for multilink ones of the same bundle.
5743 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5744
5745 if (ip == session[i].ip)
5746 {
5747 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5748 continue;
5749 }
5750
5751 if (config->allow_duplicate_users) continue;
5752 if (session[s].walled_garden || session[i].walled_garden) continue;
5753 // Guest change
5754 int found = 0;
5755 int gu;
5756 for (gu = 0; gu < guest_accounts_num; gu++)
5757 {
5758 if (!strcasecmp(user, guest_users[gu]))
5759 {
5760 found = 1;
5761 break;
5762 }
5763 }
5764 if (found) continue;
5765
5766 // Drop the new session in case of duplicate sessionss, not the old one.
5767 if (!strcasecmp(user, session[i].user))
5768 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5769 }
5770 }
5771
5772 // no need to set a route for the same IP address of the bundle
5773 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5774 {
5775 int routed = 0;
5776
5777 // Add the route for this session.
5778 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5779 {
5780 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5781 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5782 routed++;
5783
5784 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5785 }
5786
5787 // Static IPs need to be routed if not already
5788 // convered by a Framed-Route. Anything else is part
5789 // of the IP address pool and is already routed, it
5790 // just needs to be added to the IP cache.
5791 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5792 if (session[s].ip_pool_index == -1) // static ip
5793 {
5794 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5795 }
5796 else
5797 cache_ipmap(session[s].ip, s);
5798 }
5799
5800 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5801 lcp_open(s, t); // transition to Network phase and send initial IPCP
5802
5803 // Run the plugin's against this new session.
5804 {
5805 struct param_new_session data = { &tunnel[t], &session[s] };
5806 run_plugins(PLUGIN_NEW_SESSION, &data);
5807 }
5808
5809 // Allocate TBFs if throttled
5810 if (session[s].throttle_in || session[s].throttle_out)
5811 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5812
5813 session[s].last_packet = session[s].last_data = time_now;
5814
5815 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5816 fmtaddr(htonl(session[s].ip), 0),
5817 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5818
5819 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5820
5821 return 1; // RADIUS OK and IP allocated, done...
5822 }
5823
5824 //
5825 // This session just got dropped on us by the master or something.
5826 // Make sure our tables up up to date...
5827 //
5828 int load_session(sessionidt s, sessiont *new)
5829 {
5830 int i;
5831 int newip = 0;
5832
5833 // Sanity checks.
5834 if (new->ip_pool_index >= MAXIPPOOL ||
5835 new->tunnel >= MAXTUNNEL)
5836 {
5837 LOG(0, s, 0, "Strange session update received!\n");
5838 // FIXME! What to do here?
5839 return 0;
5840 }
5841
5842 //
5843 // Ok. All sanity checks passed. Now we're committed to
5844 // loading the new session.
5845 //
5846
5847 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5848
5849 // See if routes/ip cache need updating
5850 if (new->ip != session[s].ip)
5851 newip++;
5852
5853 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5854 if (new->route[i].ip != session[s].route[i].ip ||
5855 new->route[i].prefixlen != session[s].route[i].prefixlen)
5856 newip++;
5857
5858 // needs update
5859 if (newip)
5860 {
5861 int routed = 0;
5862
5863 // remove old routes...
5864 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5865 {
5866 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5867 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5868 routed++;
5869
5870 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5871 }
5872
5873 // ...ip
5874 if (session[s].ip)
5875 {
5876 if (session[s].ip_pool_index == -1) // static IP
5877 {
5878 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5879 }
5880 else // It's part of the IP pool, remove it manually.
5881 uncache_ipmap(session[s].ip);
5882 }
5883
5884 // remove old IPV6 routes...
5885 for (i = 0; i < MAXROUTE6 && session[s].route6[i].ipv6route.s6_addr[0] && session[s].route6[i].ipv6prefixlen; i++)
5886 {
5887 route6set(s, session[s].route6[i].ipv6route, session[s].route6[i].ipv6prefixlen, 0);
5888 }
5889
5890 if (session[s].ipv6address.s6_addr[0])
5891 {
5892 route6set(s, session[s].ipv6address, 128, 0);
5893 }
5894
5895 routed = 0;
5896
5897 // add new routes...
5898 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5899 {
5900 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5901 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5902 routed++;
5903
5904 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5905 }
5906
5907 // ...ip
5908 if (new->ip)
5909 {
5910 // If there's a new one, add it.
5911 if (new->ip_pool_index == -1)
5912 {
5913 if (!routed) routeset(s, new->ip, 0, 0, 1);
5914 }
5915 else
5916 cache_ipmap(new->ip, s);
5917 }
5918 }
5919
5920 // check v6 routing
5921 if (new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5922 {
5923 for (i = 0; i < MAXROUTE6 && new->route6[i].ipv6prefixlen; i++)
5924 {
5925 route6set(s, new->route6[i].ipv6route, new->route6[i].ipv6prefixlen, 1);
5926 }
5927 }
5928
5929 if (new->ipv6address.s6_addr[0] && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5930 {
5931 // Check if included in prefix
5932 if (sessionbyipv6(new->ipv6address) != s)
5933 route6set(s, new->ipv6address, 128, 1);
5934 }
5935
5936 // check filters
5937 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5938 {
5939 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5940 new->filter_in = 0;
5941 }
5942
5943 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5944 {
5945 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5946 new->filter_out = 0;
5947 }
5948
5949 if (new->filter_in != session[s].filter_in)
5950 {
5951 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5952 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5953 }
5954
5955 if (new->filter_out != session[s].filter_out)
5956 {
5957 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5958 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5959 }
5960
5961 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5962 // for walking the sessions to forward byte counts to the master.
5963 config->cluster_highest_sessionid = s;
5964
5965 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5966
5967 // Do fixups into address pool.
5968 if (new->ip_pool_index != -1)
5969 fix_address_pool(s);
5970
5971 return 1;
5972 }
5973
5974 static void initplugins()
5975 {
5976 int i;
5977
5978 loaded_plugins = ll_init();
5979 // Initialize the plugins to nothing
5980 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5981 plugins[i] = ll_init();
5982 }
5983
5984 static void *open_plugin(char *plugin_name, int load)
5985 {
5986 char path[256] = "";
5987
5988 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5989 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5990 return dlopen(path, RTLD_NOW);
5991 }
5992
5993 // plugin callback to get a config value
5994 static void *getconfig(char *key, enum config_typet type)
5995 {
5996 int i;
5997
5998 for (i = 0; config_values[i].key; i++)
5999 {
6000 if (!strcmp(config_values[i].key, key))
6001 {
6002 if (config_values[i].type == type)
6003 return ((void *) config) + config_values[i].offset;
6004
6005 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
6006 key, type, config_values[i].type);
6007
6008 return 0;
6009 }
6010 }
6011
6012 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
6013 return 0;
6014 }
6015
6016 static int add_plugin(char *plugin_name)
6017 {
6018 static struct pluginfuncs funcs = {
6019 _log,
6020 _log_hex,
6021 fmtaddr,
6022 sessionbyuser,
6023 sessiontbysessionidt,
6024 sessionidtbysessiont,
6025 radiusnew,
6026 radiussend,
6027 getconfig,
6028 sessionshutdown,
6029 sessionkill,
6030 throttle_session,
6031 cluster_send_session,
6032 };
6033
6034 void *p = open_plugin(plugin_name, 1);
6035 int (*initfunc)(struct pluginfuncs *);
6036 int i;
6037
6038 if (!p)
6039 {
6040 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
6041 return -1;
6042 }
6043
6044 if (ll_contains(loaded_plugins, p))
6045 {
6046 dlclose(p);
6047 return 0; // already loaded
6048 }
6049
6050 {
6051 int *v = dlsym(p, "plugin_api_version");
6052 if (!v || *v != PLUGIN_API_VERSION)
6053 {
6054 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
6055 dlclose(p);
6056 return -1;
6057 }
6058 }
6059
6060 if ((initfunc = dlsym(p, "plugin_init")))
6061 {
6062 if (!initfunc(&funcs))
6063 {
6064 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6065 dlclose(p);
6066 return -1;
6067 }
6068 }
6069
6070 ll_push(loaded_plugins, p);
6071
6072 for (i = 0; i < max_plugin_functions; i++)
6073 {
6074 void *x;
6075 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6076 {
6077 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
6078 ll_push(plugins[i], x);
6079 }
6080 }
6081
6082 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
6083 return 1;
6084 }
6085
6086 static void run_plugin_done(void *plugin)
6087 {
6088 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
6089
6090 if (donefunc)
6091 donefunc();
6092 }
6093
6094 static int remove_plugin(char *plugin_name)
6095 {
6096 void *p = open_plugin(plugin_name, 0);
6097 int loaded = 0;
6098
6099 if (!p)
6100 return -1;
6101
6102 if (ll_contains(loaded_plugins, p))
6103 {
6104 int i;
6105 for (i = 0; i < max_plugin_functions; i++)
6106 {
6107 void *x;
6108 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6109 ll_delete(plugins[i], x);
6110 }
6111
6112 ll_delete(loaded_plugins, p);
6113 run_plugin_done(p);
6114 loaded = 1;
6115 }
6116
6117 dlclose(p);
6118 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6119 return loaded;
6120 }
6121
6122 int run_plugins(int plugin_type, void *data)
6123 {
6124 int (*func)(void *data);
6125
6126 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6127 return PLUGIN_RET_ERROR;
6128
6129 ll_reset(plugins[plugin_type]);
6130 while ((func = ll_next(plugins[plugin_type])))
6131 {
6132 int r = func(data);
6133
6134 if (r != PLUGIN_RET_OK)
6135 return r; // stop here
6136 }
6137
6138 return PLUGIN_RET_OK;
6139 }
6140
6141 static void plugins_done()
6142 {
6143 void *p;
6144
6145 ll_reset(loaded_plugins);
6146 while ((p = ll_next(loaded_plugins)))
6147 run_plugin_done(p);
6148 }
6149
6150 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6151 {
6152 struct nsctl request;
6153 struct nsctl response;
6154 int type = unpack_control(&request, buf, len);
6155 int r;
6156 void *p;
6157
6158 if (log_stream && config->debug >= 4)
6159 {
6160 if (type < 0)
6161 {
6162 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6163 fmtaddr(addr->sin_addr.s_addr, 0), type);
6164 }
6165 else
6166 {
6167 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6168 dump_control(&request, log_stream);
6169 }
6170 }
6171
6172 switch (type)
6173 {
6174 case NSCTL_REQ_LOAD:
6175 if (request.argc != 1)
6176 {
6177 response.type = NSCTL_RES_ERR;
6178 response.argc = 1;
6179 response.argv[0] = "name of plugin required";
6180 }
6181 else if ((r = add_plugin(request.argv[0])) < 1)
6182 {
6183 response.type = NSCTL_RES_ERR;
6184 response.argc = 1;
6185 response.argv[0] = !r
6186 ? "plugin already loaded"
6187 : "error loading plugin";
6188 }
6189 else
6190 {
6191 response.type = NSCTL_RES_OK;
6192 response.argc = 0;
6193 }
6194
6195 break;
6196
6197 case NSCTL_REQ_UNLOAD:
6198 if (request.argc != 1)
6199 {
6200 response.type = NSCTL_RES_ERR;
6201 response.argc = 1;
6202 response.argv[0] = "name of plugin required";
6203 }
6204 else if ((r = remove_plugin(request.argv[0])) < 1)
6205 {
6206 response.type = NSCTL_RES_ERR;
6207 response.argc = 1;
6208 response.argv[0] = !r
6209 ? "plugin not loaded"
6210 : "plugin not found";
6211 }
6212 else
6213 {
6214 response.type = NSCTL_RES_OK;
6215 response.argc = 0;
6216 }
6217
6218 break;
6219
6220 case NSCTL_REQ_HELP:
6221 response.type = NSCTL_RES_OK;
6222 response.argc = 0;
6223
6224 ll_reset(loaded_plugins);
6225 while ((p = ll_next(loaded_plugins)))
6226 {
6227 char **help = dlsym(p, "plugin_control_help");
6228 while (response.argc < 0xff && help && *help)
6229 response.argv[response.argc++] = *help++;
6230 }
6231
6232 break;
6233
6234 case NSCTL_REQ_CONTROL:
6235 {
6236 struct param_control param = {
6237 config->cluster_iam_master,
6238 request.argc,
6239 request.argv,
6240 0,
6241 NULL,
6242 };
6243
6244 int r = run_plugins(PLUGIN_CONTROL, &param);
6245
6246 if (r == PLUGIN_RET_ERROR)
6247 {
6248 response.type = NSCTL_RES_ERR;
6249 response.argc = 1;
6250 response.argv[0] = param.additional
6251 ? param.additional
6252 : "error returned by plugin";
6253 }
6254 else if (r == PLUGIN_RET_NOTMASTER)
6255 {
6256 static char msg[] = "must be run on master: 000.000.000.000";
6257
6258 response.type = NSCTL_RES_ERR;
6259 response.argc = 1;
6260 if (config->cluster_master_address)
6261 {
6262 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6263 response.argv[0] = msg;
6264 }
6265 else
6266 {
6267 response.argv[0] = "must be run on master: none elected";
6268 }
6269 }
6270 else if (!(param.response & NSCTL_RESPONSE))
6271 {
6272 response.type = NSCTL_RES_ERR;
6273 response.argc = 1;
6274 response.argv[0] = param.response
6275 ? "unrecognised response value from plugin"
6276 : "unhandled action";
6277 }
6278 else
6279 {
6280 response.type = param.response;
6281 response.argc = 0;
6282 if (param.additional)
6283 {
6284 response.argc = 1;
6285 response.argv[0] = param.additional;
6286 }
6287 }
6288 }
6289
6290 break;
6291
6292 default:
6293 response.type = NSCTL_RES_ERR;
6294 response.argc = 1;
6295 response.argv[0] = "error unpacking control packet";
6296 }
6297
6298 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6299 if (!buf)
6300 {
6301 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6302 return;
6303 }
6304
6305 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6306 if (r > 0)
6307 {
6308 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6309 if (log_stream && config->debug >= 4)
6310 {
6311 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6312 dump_control(&response, log_stream);
6313 }
6314 }
6315 else
6316 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6317 fmtaddr(addr->sin_addr.s_addr, 0), r);
6318
6319 free(buf);
6320 }
6321
6322 static tunnelidt new_tunnel()
6323 {
6324 tunnelidt i;
6325 for (i = 1; i < MAXTUNNEL; i++)
6326 {
6327 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6328 {
6329 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6330 if (i > config->cluster_highest_tunnelid)
6331 config->cluster_highest_tunnelid = i;
6332 return i;
6333 }
6334 }
6335 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6336 return 0;
6337 }
6338
6339 //
6340 // We're becoming the master. Do any required setup..
6341 //
6342 // This is principally telling all the plugins that we're
6343 // now a master, and telling them about all the sessions
6344 // that are active too..
6345 //
6346 void become_master(void)
6347 {
6348 int s, i;
6349 static struct event_data d[RADIUS_FDS];
6350 struct epoll_event e;
6351
6352 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6353
6354 // running a bunch of iptables commands is slow and can cause
6355 // the master to drop tunnels on takeover--kludge around the
6356 // problem by forking for the moment (note: race)
6357 if (!fork_and_close())
6358 {
6359 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6360 {
6361 if (!session[s].opened) // Not an in-use session.
6362 continue;
6363
6364 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6365 }
6366 exit(0);
6367 }
6368
6369 // add radius fds
6370 e.events = EPOLLIN;
6371 for (i = 0; i < RADIUS_FDS; i++)
6372 {
6373 d[i].type = FD_TYPE_RADIUS;
6374 d[i].index = i;
6375 e.data.ptr = &d[i];
6376
6377 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6378 }
6379 }
6380
6381 int cmd_show_hist_idle(struct cli_def *cli, const char *command, char **argv, int argc)
6382 {
6383 int s, i;
6384 int count = 0;
6385 int buckets[64];
6386
6387 if (CLI_HELP_REQUESTED)
6388 return CLI_HELP_NO_ARGS;
6389
6390 time(&time_now);
6391 for (i = 0; i < 64;++i) buckets[i] = 0;
6392
6393 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6394 {
6395 int idle;
6396 if (!session[s].opened)
6397 continue;
6398
6399 idle = time_now - session[s].last_data;
6400 idle /= 5 ; // In multiples of 5 seconds.
6401 if (idle < 0)
6402 idle = 0;
6403 if (idle > 63)
6404 idle = 63;
6405
6406 ++count;
6407 ++buckets[idle];
6408 }
6409
6410 for (i = 0; i < 63; ++i)
6411 {
6412 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6413 }
6414 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6415 cli_print(cli, "%d total sessions open.", count);
6416 return CLI_OK;
6417 }
6418
6419 int cmd_show_hist_open(struct cli_def *cli, const char *command, char **argv, int argc)
6420 {
6421 int s, i;
6422 int count = 0;
6423 int buckets[64];
6424
6425 if (CLI_HELP_REQUESTED)
6426 return CLI_HELP_NO_ARGS;
6427
6428 time(&time_now);
6429 for (i = 0; i < 64;++i) buckets[i] = 0;
6430
6431 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6432 {
6433 int open = 0, d;
6434 if (!session[s].opened)
6435 continue;
6436
6437 d = time_now - session[s].opened;
6438 if (d < 0)
6439 d = 0;
6440 while (d > 1 && open < 32)
6441 {
6442 ++open;
6443 d >>= 1; // half.
6444 }
6445 ++count;
6446 ++buckets[open];
6447 }
6448
6449 s = 1;
6450 for (i = 0; i < 30; ++i)
6451 {
6452 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6453 s <<= 1;
6454 }
6455 cli_print(cli, "%d total sessions open.", count);
6456 return CLI_OK;
6457 }
6458
6459 /* Unhide an avp.
6460 *
6461 * This unencodes the AVP using the L2TP secret and the previously
6462 * stored random vector. It overwrites the hidden data with the
6463 * unhidden AVP subformat.
6464 */
6465 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6466 {
6467 MD5_CTX ctx;
6468 uint8_t digest[16];
6469 uint8_t *last;
6470 size_t d = 0;
6471 uint16_t m = htons(type);
6472
6473 // Compute initial pad
6474 MD5_Init(&ctx);
6475 MD5_Update(&ctx, (unsigned char *) &m, 2);
6476 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6477 MD5_Update(&ctx, vector, vec_len);
6478 MD5_Final(digest, &ctx);
6479
6480 // pointer to last decoded 16 octets
6481 last = value;
6482
6483 while (len > 0)
6484 {
6485 // calculate a new pad based on the last decoded block
6486 if (d >= sizeof(digest))
6487 {
6488 MD5_Init(&ctx);
6489 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6490 MD5_Update(&ctx, last, sizeof(digest));
6491 MD5_Final(digest, &ctx);
6492
6493 d = 0;
6494 last = value;
6495 }
6496
6497 *value++ ^= digest[d++];
6498 len--;
6499 }
6500 }
6501
6502 int find_filter(char const *name, size_t len)
6503 {
6504 int free = -1;
6505 int i;
6506
6507 for (i = 0; i < MAXFILTER; i++)
6508 {
6509 if (!*ip_filters[i].name)
6510 {
6511 if (free < 0)
6512 free = i;
6513
6514 continue;
6515 }
6516
6517 if (strlen(ip_filters[i].name) != len)
6518 continue;
6519
6520 if (!strncmp(ip_filters[i].name, name, len))
6521 return i;
6522 }
6523
6524 return free;
6525 }
6526
6527 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6528 {
6529 switch (p->op)
6530 {
6531 case FILTER_PORT_OP_EQ: return port == p->port;
6532 case FILTER_PORT_OP_NEQ: return port != p->port;
6533 case FILTER_PORT_OP_GT: return port > p->port;
6534 case FILTER_PORT_OP_LT: return port < p->port;
6535 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6536 }
6537
6538 return 0;
6539 }
6540
6541 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6542 {
6543 switch (op)
6544 {
6545 case FILTER_FLAG_OP_ANY:
6546 return (flags & sflags) || (~flags & cflags);
6547
6548 case FILTER_FLAG_OP_ALL:
6549 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6550
6551 case FILTER_FLAG_OP_EST:
6552 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6553 }
6554
6555 return 0;
6556 }
6557
6558 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6559 {
6560 uint16_t frag_offset;
6561 uint8_t proto;
6562 in_addr_t src_ip;
6563 in_addr_t dst_ip;
6564 uint16_t src_port = 0;
6565 uint16_t dst_port = 0;
6566 uint8_t flags = 0;
6567 ip_filter_rulet *rule;
6568
6569 if (len < 20) // up to end of destination address
6570 return 0;
6571
6572 if ((*buf >> 4) != 4) // IPv4
6573 return 0;
6574
6575 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6576 proto = buf[9];
6577 src_ip = *(in_addr_t *) (buf + 12);
6578 dst_ip = *(in_addr_t *) (buf + 16);
6579
6580 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6581 {
6582 int l = (buf[0] & 0xf) * 4; // length of IP header
6583 if (len < l + 4) // ports
6584 return 0;
6585
6586 src_port = ntohs(*(uint16_t *) (buf + l));
6587 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6588 if (proto == IPPROTO_TCP)
6589 {
6590 if (len < l + 14) // flags
6591 return 0;
6592
6593 flags = buf[l + 13] & 0x3f;
6594 }
6595 }
6596
6597 for (rule = ip_filters[filter].rules; rule->action; rule++)
6598 {
6599 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6600 continue;
6601
6602 if (rule->src_wild != INADDR_BROADCAST &&
6603 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6604 continue;
6605
6606 if (rule->dst_wild != INADDR_BROADCAST &&
6607 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6608 continue;
6609
6610 if (frag_offset)
6611 {
6612 // layer 4 deny rules are skipped
6613 if (rule->action == FILTER_ACTION_DENY &&
6614 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6615 continue;
6616 }
6617 else
6618 {
6619 if (rule->frag)
6620 continue;
6621
6622 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6623 {
6624 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6625 continue;
6626
6627 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6628 continue;
6629
6630 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6631 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6632 continue;
6633 }
6634 }
6635
6636 // matched
6637 rule->counter++;
6638 return rule->action == FILTER_ACTION_PERMIT;
6639 }
6640
6641 // default deny
6642 return 0;
6643 }
6644
6645 tunnelidt lac_new_tunnel()
6646 {
6647 return new_tunnel();
6648 }
6649
6650 void lac_tunnelclear(tunnelidt t)
6651 {
6652 tunnelclear(t);
6653 }
6654
6655 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6656 {
6657 uint16_t version = 0x0100; // protocol version
6658
6659 tunnel[t].state = TUNNELOPENING;
6660
6661 // Sent SCCRQ - Start Control Connection Request
6662 controlt *c = controlnew(1); // sending SCCRQ
6663 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6664 controls(c, 8, Vendor_name, 1); // Vendor name
6665 control16(c, 2, version, 1); // protocol version
6666 control32(c, 3, 3, 1); // framing Capabilities
6667 control16(c, 9, t, 1); // assigned tunnel
6668 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6669 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6670 controladd(c, 0, t); // send
6671 }
6672
6673 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6674 {
6675 // Sent ICRQ Incoming-call-request
6676 controlt *c = controlnew(10); // ICRQ
6677
6678 control16(c, 14, s, 1); // assigned sesion
6679 call_serial_number++;
6680 control32(c, 15, call_serial_number, 1); // call serial number
6681 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6682 controladd(c, 0, t); // send
6683 }
6684
6685 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6686 {
6687 tunnelshutdown(t, reason, result, error, msg);
6688 }
6689