Fix: improved load balancing algorithm
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 #include <arpa/inet.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <linux/if_tun.h>
12 #define SYSLOG_NAMES
13 #include <syslog.h>
14 #include <malloc.h>
15 #include <net/route.h>
16 #include <sys/mman.h>
17 #include <netdb.h>
18 #include <netinet/in.h>
19 #include <netinet/ip6.h>
20 #include <stdarg.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/wait.h>
31 #include <net/if.h>
32 #include <stddef.h>
33 #include <time.h>
34 #include <dlfcn.h>
35 #include <unistd.h>
36 #include <sched.h>
37 #include <sys/sysinfo.h>
38 #include <libcli.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
41
42 #include "md5.h"
43 #include "l2tpns.h"
44 #include "cluster.h"
45 #include "plugin.h"
46 #include "ll.h"
47 #include "constants.h"
48 #include "control.h"
49 #include "util.h"
50 #include "tbf.h"
51
52 #ifdef BGP
53 #include "bgp.h"
54 #endif
55
56 #include "l2tplac.h"
57 #include "pppoe.h"
58
59 char * Vendor_name = "Linux L2TPNS";
60 uint32_t call_serial_number = 0;
61
62 // Globals
63 configt *config = NULL; // all configuration
64 int nlfd = -1; // netlink socket
65 int tunfd = -1; // tun interface file handle. (network device)
66 int udpfd[MAX_UDPFD + 1] = INIT_TABUDPFD; // array UDP file handle + 1 for lac udp
67 int udplacfd = -1; // UDP LAC file handle
68 int controlfd = -1; // Control signal handle
69 int clifd = -1; // Socket listening for CLI connections.
70 int daefd = -1; // Socket listening for DAE connections.
71 int snoopfd = -1; // UDP file handle for sending out intercept data
72 int *radfds = NULL; // RADIUS requests file handles
73 int rand_fd = -1; // Random data source
74 int cluster_sockfd = -1; // Intra-cluster communications socket.
75 int epollfd = -1; // event polling
76 time_t basetime = 0; // base clock
77 char hostname[MAXHOSTNAME] = ""; // us.
78 int tunidx; // ifr_ifindex of tun device
79 int nlseqnum = 0; // netlink sequence number
80 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
81 static int syslog_log = 0; // are we logging to syslog
82 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
83 uint32_t last_id = 0; // Unique ID for radius accounting
84 // Guest change
85 char guest_users[10][32]; // Array of guest users
86 int guest_accounts_num = 0; // Number of guest users
87
88 // calculated from config->l2tp_mtu
89 uint16_t MRU = 0; // PPP MRU
90 uint16_t MSS = 0; // TCP MSS
91
92 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
93 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
94
95 union iphash ip_hash[256]; // Mapping from IP address to session structures.
96
97 struct ipv6radix {
98 sessionidt sess;
99 struct ipv6radix *branch;
100 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
101
102 // Traffic counters.
103 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
104 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
105 uint32_t eth_tx = 0;
106
107 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
108 time_t time_now = 0; // Current time in seconds since epoch.
109 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
110 static char time_now_string[64] = {0}; // Current time as a string.
111 static int time_changed = 0; // time_now changed
112 char main_quit = 0; // True if we're in the process of exiting.
113 static char main_reload = 0; // Re-load pending
114 linked_list *loaded_plugins;
115 linked_list *plugins[MAX_PLUGIN_TYPES];
116
117 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
118 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
119
120 config_descriptt config_values[] = {
121 CONFIG("debug", debug, INT),
122 CONFIG("log_file", log_filename, STRING),
123 CONFIG("pid_file", pid_file, STRING),
124 CONFIG("random_device", random_device, STRING),
125 CONFIG("l2tp_secret", l2tp_secret, STRING),
126 CONFIG("l2tp_mtu", l2tp_mtu, INT),
127 CONFIG("ppp_restart_time", ppp_restart_time, INT),
128 CONFIG("ppp_max_configure", ppp_max_configure, INT),
129 CONFIG("ppp_max_failure", ppp_max_failure, INT),
130 CONFIG("primary_dns", default_dns1, IPv4),
131 CONFIG("secondary_dns", default_dns2, IPv4),
132 CONFIG("primary_radius", radiusserver[0], IPv4),
133 CONFIG("secondary_radius", radiusserver[1], IPv4),
134 CONFIG("primary_radius_port", radiusport[0], SHORT),
135 CONFIG("secondary_radius_port", radiusport[1], SHORT),
136 CONFIG("radius_accounting", radius_accounting, BOOL),
137 CONFIG("radius_interim", radius_interim, INT),
138 CONFIG("radius_secret", radiussecret, STRING),
139 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
140 CONFIG("radius_dae_port", radius_dae_port, SHORT),
141 CONFIG("radius_bind_min", radius_bind_min, SHORT),
142 CONFIG("radius_bind_max", radius_bind_max, SHORT),
143 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
144 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
145 CONFIG("guest_account", guest_user, STRING),
146 CONFIG("bind_address", bind_address, IPv4),
147 CONFIG("peer_address", peer_address, IPv4),
148 CONFIG("send_garp", send_garp, BOOL),
149 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
150 CONFIG("throttle_buckets", num_tbfs, INT),
151 CONFIG("accounting_dir", accounting_dir, STRING),
152 CONFIG("account_all_origin", account_all_origin, BOOL),
153 CONFIG("dump_speed", dump_speed, BOOL),
154 CONFIG("multi_read_count", multi_read_count, INT),
155 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
156 CONFIG("lock_pages", lock_pages, BOOL),
157 CONFIG("icmp_rate", icmp_rate, INT),
158 CONFIG("packet_limit", max_packets, INT),
159 CONFIG("cluster_address", cluster_address, IPv4),
160 CONFIG("cluster_interface", cluster_interface, STRING),
161 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
162 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
163 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
164 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
165 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
166 CONFIG("cli_bind_address", cli_bind_address, IPv4),
167 CONFIG("hostname", hostname, STRING),
168 #ifdef BGP
169 CONFIG("nexthop_address", nexthop_address, IPv4),
170 CONFIG("nexthop6_address", nexthop6_address, IPv6),
171 #endif
172 CONFIG("echo_timeout", echo_timeout, INT),
173 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
174 CONFIG("iftun_address", iftun_address, IPv4),
175 CONFIG("tundevicename", tundevicename, STRING),
176 CONFIG("disable_lac_func", disable_lac_func, BOOL),
177 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
178 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
179 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
180 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
181 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
182 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
183 CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
184 CONFIG("disable_no_spoof", disable_no_spoof, BOOL),
185 CONFIG("bind_multi_address", bind_multi_address, STRING),
186 CONFIG("grp_txrate_average_time", grp_txrate_average_time, INT),
187 CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name, BOOL),
188 CONFIG("multi_hostname", multi_hostname, STRING),
189 { NULL, 0, 0, 0 }
190 };
191
192 static char *plugin_functions[] = {
193 NULL,
194 "plugin_pre_auth",
195 "plugin_post_auth",
196 "plugin_timer",
197 "plugin_new_session",
198 "plugin_kill_session",
199 "plugin_control",
200 "plugin_radius_response",
201 "plugin_radius_reset",
202 "plugin_radius_account",
203 "plugin_become_master",
204 "plugin_new_session_master",
205 };
206
207 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
208
209 // Counters for shutdown sessions
210 static sessiont shut_acct[8192];
211 static sessionidt shut_acct_n = 0;
212
213 tunnelt *tunnel = NULL; // Array of tunnel structures.
214 bundlet *bundle = NULL; // Array of bundle structures.
215 fragmentationt *frag = NULL; // Array of fragmentation structures.
216 sessiont *session = NULL; // Array of session structures.
217 groupsesst *grpsession = NULL; // Array of groupsesst structures.
218 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
219 radiust *radius = NULL; // Array of radius structures.
220 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
221 ip_filtert *ip_filters = NULL; // Array of named filters.
222 static controlt *controlfree = 0;
223 struct Tstats *_statistics = NULL;
224 #ifdef RINGBUFFER
225 struct Tringbuffer *ringbuffer = NULL;
226 #endif
227
228 static void uncache_ipmap(in_addr_t ip);
229 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
230 static void free_ip_address(sessionidt s);
231 static void dump_acct_info(int all);
232 static void sighup_handler(int sig);
233 static void shutdown_handler(int sig);
234 static void sigchild_handler(int sig);
235 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
236 static void update_config(void);
237 static void read_config_file(void);
238 static void initplugins(void);
239 static int add_plugin(char *plugin_name);
240 static int remove_plugin(char *plugin_name);
241 static void plugins_done(void);
242 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
243 static tunnelidt new_tunnel(void);
244 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
245 static void bundleclear(bundleidt b);
246
247 // return internal time (10ths since process startup), set f if given
248 // as a side-effect sets time_now, and time_changed
249 static clockt now(double *f)
250 {
251 struct timeval t;
252 gettimeofday(&t, 0);
253 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
254 if (t.tv_sec != time_now)
255 {
256 time_now = t.tv_sec;
257 time_changed++;
258 grp_time_changed();
259 }
260
261 // Time in milliseconds
262 // TODO FOR MLPPP DEV
263 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
264
265 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
266 }
267
268 // work out a retry time based on try number
269 // This is a straight bounded exponential backoff.
270 // Maximum re-try time is 32 seconds. (2^5).
271 clockt backoff(uint8_t try)
272 {
273 if (try > 5) try = 5; // max backoff
274 return now(NULL) + 10 * (1 << try);
275 }
276
277
278 //
279 // Log a debug message. Typically called via the LOG macro
280 //
281 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
282 {
283 static char message[65536] = {0};
284 va_list ap;
285
286 #ifdef RINGBUFFER
287 if (ringbuffer)
288 {
289 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
290 ringbuffer->tail = 0;
291 if (ringbuffer->tail == ringbuffer->head)
292 if (++ringbuffer->head >= RINGBUFFER_SIZE)
293 ringbuffer->head = 0;
294
295 ringbuffer->buffer[ringbuffer->tail].level = level;
296 ringbuffer->buffer[ringbuffer->tail].session = s;
297 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
298 va_start(ap, format);
299 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
300 va_end(ap);
301 }
302 #endif
303
304 if (config->debug < level) return;
305
306 va_start(ap, format);
307 vsnprintf(message, sizeof(message), format, ap);
308
309 if (log_stream)
310 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
311 else if (syslog_log)
312 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
313
314 va_end(ap);
315 }
316
317 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
318 {
319 int i, j;
320 const uint8_t *d = data;
321
322 if (config->debug < level) return;
323
324 // No support for _log_hex to syslog
325 if (log_stream)
326 {
327 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
328 setvbuf(log_stream, NULL, _IOFBF, 16384);
329
330 for (i = 0; i < maxsize; )
331 {
332 fprintf(log_stream, "%4X: ", i);
333 for (j = i; j < maxsize && j < (i + 16); j++)
334 {
335 fprintf(log_stream, "%02X ", d[j]);
336 if (j == i + 7)
337 fputs(": ", log_stream);
338 }
339
340 for (; j < i + 16; j++)
341 {
342 fputs(" ", log_stream);
343 if (j == i + 7)
344 fputs(": ", log_stream);
345 }
346
347 fputs(" ", log_stream);
348 for (j = i; j < maxsize && j < (i + 16); j++)
349 {
350 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
351 fputc(d[j], log_stream);
352 else
353 fputc('.', log_stream);
354
355 if (j == i + 7)
356 fputs(" ", log_stream);
357 }
358
359 i = j;
360 fputs("\n", log_stream);
361 }
362
363 fflush(log_stream);
364 setbuf(log_stream, NULL);
365 }
366 }
367
368 // update a counter, accumulating 2^32 wraps
369 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
370 {
371 uint32_t new = *counter + delta;
372 if (new < *counter)
373 (*wrap)++;
374
375 *counter = new;
376 }
377
378 // initialise the random generator
379 static void initrandom(char *source)
380 {
381 static char path[sizeof(config->random_device)] = "*undefined*";
382
383 // reinitialise only if we are forced to do so or if the config has changed
384 if (source && !strncmp(path, source, sizeof(path)))
385 return;
386
387 // close previous source, if any
388 if (rand_fd >= 0)
389 close(rand_fd);
390
391 rand_fd = -1;
392
393 if (source)
394 {
395 // register changes
396 snprintf(path, sizeof(path), "%s", source);
397
398 if (*path == '/')
399 {
400 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
401 if (rand_fd < 0)
402 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
403 path, strerror(errno));
404 }
405 }
406 }
407
408 // fill buffer with random data
409 void random_data(uint8_t *buf, int len)
410 {
411 int n = 0;
412
413 CSTAT(random_data);
414 if (rand_fd >= 0)
415 {
416 n = read(rand_fd, buf, len);
417 if (n >= len) return;
418 if (n < 0)
419 {
420 if (errno != EAGAIN)
421 {
422 LOG(0, 0, 0, "Error reading from random source: %s\n",
423 strerror(errno));
424
425 // fall back to rand()
426 initrandom(NULL);
427 }
428
429 n = 0;
430 }
431 }
432
433 // append missing data
434 while (n < len)
435 // not using the low order bits from the prng stream
436 buf[n++] = (rand() >> 4) & 0xff;
437 }
438
439 // Add a route
440 //
441 // This adds it to the routing table, advertises it
442 // via BGP if enabled, and stuffs it into the
443 // 'sessionbyip' cache.
444 //
445 // 'ip' must be in _host_ order.
446 //
447 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
448 {
449 struct {
450 struct nlmsghdr nh;
451 struct rtmsg rt;
452 char buf[32];
453 } req;
454 int i;
455 in_addr_t n_ip;
456
457 if (!prefixlen) prefixlen = 32;
458
459 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
460
461 memset(&req, 0, sizeof(req));
462
463 if (add)
464 {
465 req.nh.nlmsg_type = RTM_NEWROUTE;
466 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
467 }
468 else
469 {
470 req.nh.nlmsg_type = RTM_DELROUTE;
471 req.nh.nlmsg_flags = NLM_F_REQUEST;
472 }
473
474 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
475
476 req.rt.rtm_family = AF_INET;
477 req.rt.rtm_dst_len = prefixlen;
478 req.rt.rtm_table = RT_TABLE_MAIN;
479 req.rt.rtm_protocol = 42;
480 req.rt.rtm_scope = RT_SCOPE_LINK;
481 req.rt.rtm_type = RTN_UNICAST;
482
483 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
484 n_ip = htonl(ip);
485 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
486 if (gw)
487 {
488 n_ip = htonl(gw);
489 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
490 }
491
492 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
493 fmtaddr(htonl(ip), 0), prefixlen,
494 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
495
496 if (netlink_send(&req.nh) < 0)
497 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
498
499 #ifdef BGP
500 if (add)
501 bgp_add_route(htonl(ip), prefixlen);
502 else
503 bgp_del_route(htonl(ip), prefixlen);
504 #endif /* BGP */
505
506 // Add/Remove the IPs to the 'sessionbyip' cache.
507 // Note that we add the zero address in the case of
508 // a network route. Roll on CIDR.
509
510 // Note that 's == 0' implies this is the address pool.
511 // We still cache it here, because it will pre-fill
512 // the malloc'ed tree.
513
514 if (s)
515 {
516 if (!add) // Are we deleting a route?
517 s = 0; // Caching the session as '0' is the same as uncaching.
518
519 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
520 cache_ipmap(i, s);
521 }
522 }
523
524 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
525 {
526 struct {
527 struct nlmsghdr nh;
528 struct rtmsg rt;
529 char buf[64];
530 } req;
531 int metric;
532 char ipv6addr[INET6_ADDRSTRLEN];
533
534 if (!config->ipv6_prefix.s6_addr[0])
535 {
536 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
537 return;
538 }
539
540 memset(&req, 0, sizeof(req));
541
542 if (add)
543 {
544 req.nh.nlmsg_type = RTM_NEWROUTE;
545 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
546 }
547 else
548 {
549 req.nh.nlmsg_type = RTM_DELROUTE;
550 req.nh.nlmsg_flags = NLM_F_REQUEST;
551 }
552
553 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
554
555 req.rt.rtm_family = AF_INET6;
556 req.rt.rtm_dst_len = prefixlen;
557 req.rt.rtm_table = RT_TABLE_MAIN;
558 req.rt.rtm_protocol = 42;
559 req.rt.rtm_scope = RT_SCOPE_LINK;
560 req.rt.rtm_type = RTN_UNICAST;
561
562 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
563 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
564 metric = 1;
565 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
566
567 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
568 add ? "add" : "del",
569 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
570 prefixlen);
571
572 if (netlink_send(&req.nh) < 0)
573 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
574
575 #ifdef BGP
576 if (add)
577 bgp_add_route6(ip, prefixlen);
578 else
579 bgp_del_route6(ip, prefixlen);
580 #endif /* BGP */
581
582 if (s)
583 {
584 if (!add) // Are we deleting a route?
585 s = 0; // Caching the session as '0' is the same as uncaching.
586
587 cache_ipv6map(ip, prefixlen, s);
588 }
589
590 return;
591 }
592
593 //
594 // Set up netlink socket
595 static void initnetlink(void)
596 {
597 struct sockaddr_nl nladdr;
598
599 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
600 if (nlfd < 0)
601 {
602 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
603 exit(1);
604 }
605
606 memset(&nladdr, 0, sizeof(nladdr));
607 nladdr.nl_family = AF_NETLINK;
608 nladdr.nl_pid = getpid();
609
610 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
611 {
612 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
613 exit(1);
614 }
615 }
616
617 ssize_t netlink_send(struct nlmsghdr *nh)
618 {
619 struct sockaddr_nl nladdr;
620 struct iovec iov;
621 struct msghdr msg;
622
623 nh->nlmsg_pid = getpid();
624 nh->nlmsg_seq = ++nlseqnum;
625
626 // set kernel address
627 memset(&nladdr, 0, sizeof(nladdr));
628 nladdr.nl_family = AF_NETLINK;
629
630 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
631 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
632
633 return sendmsg(nlfd, &msg, 0);
634 }
635
636 static ssize_t netlink_recv(void *buf, ssize_t len)
637 {
638 struct sockaddr_nl nladdr;
639 struct iovec iov;
640 struct msghdr msg;
641
642 // set kernel address
643 memset(&nladdr, 0, sizeof(nladdr));
644 nladdr.nl_family = AF_NETLINK;
645
646 iov = (struct iovec){ buf, len };
647 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
648
649 return recvmsg(nlfd, &msg, 0);
650 }
651
652 /* adapted from iproute2 */
653 void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
654 {
655 int len = RTA_LENGTH(alen);
656 struct rtattr *rta;
657
658 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
659 rta->rta_type = type;
660 rta->rta_len = len;
661 memcpy(RTA_DATA(rta), data, alen);
662 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
663 }
664
665 // messages corresponding to different phases seq number
666 static char *tun_nl_phase_msg[] = {
667 "initialized",
668 "getting tun interface index",
669 "setting tun interface parameters",
670 "setting tun IPv4 address",
671 "setting tun LL IPv6 address",
672 "setting tun global IPv6 address",
673 };
674
675 //
676 // Set up TUN interface
677 static void inittun(void)
678 {
679 struct ifreq ifr;
680
681 memset(&ifr, 0, sizeof(ifr));
682 ifr.ifr_flags = IFF_TUN;
683
684 tunfd = open(TUNDEVICE, O_RDWR);
685 if (tunfd < 0)
686 { // fatal
687 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
688 exit(1);
689 }
690 {
691 int flags = fcntl(tunfd, F_GETFL, 0);
692 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
693 }
694
695 if (*config->tundevicename)
696 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
697
698 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
699 {
700 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
701 exit(1);
702 }
703 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
704 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
705
706 tunidx = if_nametoindex(config->tundevicename);
707 if (tunidx == 0)
708 {
709 LOG(0, 0, 0, "Can't get tun interface index\n");
710 exit(1);
711 }
712
713 {
714 struct {
715 // interface setting
716 struct nlmsghdr nh;
717 union {
718 struct ifinfomsg ifinfo;
719 struct ifaddrmsg ifaddr;
720 } ifmsg;
721 char rtdata[32]; // 32 should be enough
722 } req;
723 uint32_t txqlen, mtu;
724 in_addr_t ip;
725
726 memset(&req, 0, sizeof(req));
727
728 req.nh.nlmsg_type = RTM_NEWLINK;
729 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
730 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
731
732 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
733 req.ifmsg.ifinfo.ifi_index = tunidx;
734 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
735 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
736
737 /* Bump up the qlen to deal with bursts from the network */
738 txqlen = 1000;
739 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
740 /* set MTU to modem MRU */
741 mtu = MRU;
742 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
743
744 if (netlink_send(&req.nh) < 0)
745 goto senderror;
746
747 memset(&req, 0, sizeof(req));
748
749 req.nh.nlmsg_type = RTM_NEWADDR;
750 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
751 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
752
753 req.ifmsg.ifaddr.ifa_family = AF_INET;
754 req.ifmsg.ifaddr.ifa_prefixlen = 32;
755 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
756 req.ifmsg.ifaddr.ifa_index = tunidx;
757
758 if (config->nbmultiaddress > 1)
759 {
760 int i;
761 for (i = 0; i < config->nbmultiaddress ; i++)
762 {
763 ip = config->iftun_n_address[i];
764 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
765 if (netlink_send(&req.nh) < 0)
766 goto senderror;
767 }
768 }
769 else
770 {
771 if (config->iftun_address)
772 ip = config->iftun_address;
773 else
774 ip = 0x01010101; // 1.1.1.1
775 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
776
777 if (netlink_send(&req.nh) < 0)
778 goto senderror;
779 }
780
781
782
783 // Only setup IPv6 on the tun device if we have a configured prefix
784 if (config->ipv6_prefix.s6_addr[0]) {
785 struct in6_addr ip6;
786
787 memset(&req, 0, sizeof(req));
788
789 req.nh.nlmsg_type = RTM_NEWADDR;
790 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
791 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
792
793 req.ifmsg.ifaddr.ifa_family = AF_INET6;
794 req.ifmsg.ifaddr.ifa_prefixlen = 64;
795 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
796 req.ifmsg.ifaddr.ifa_index = tunidx;
797
798 // Link local address is FE80::1
799 memset(&ip6, 0, sizeof(ip6));
800 ip6.s6_addr[0] = 0xFE;
801 ip6.s6_addr[1] = 0x80;
802 ip6.s6_addr[15] = 1;
803 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
804
805 if (netlink_send(&req.nh) < 0)
806 goto senderror;
807
808 memset(&req, 0, sizeof(req));
809
810 req.nh.nlmsg_type = RTM_NEWADDR;
811 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
812 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
813
814 req.ifmsg.ifaddr.ifa_family = AF_INET6;
815 req.ifmsg.ifaddr.ifa_prefixlen = 64;
816 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
817 req.ifmsg.ifaddr.ifa_index = tunidx;
818
819 // Global address is prefix::1
820 ip6 = config->ipv6_prefix;
821 ip6.s6_addr[15] = 1;
822 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
823
824 if (netlink_send(&req.nh) < 0)
825 goto senderror;
826 }
827
828 memset(&req, 0, sizeof(req));
829
830 req.nh.nlmsg_type = NLMSG_DONE;
831 req.nh.nlmsg_len = NLMSG_LENGTH(0);
832
833 if (netlink_send(&req.nh) < 0)
834 goto senderror;
835
836 // if we get an error for seqnum < min_initok_nlseqnum,
837 // we must exit as initialization went wrong
838 if (config->ipv6_prefix.s6_addr[0])
839 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
840 else
841 min_initok_nlseqnum = 3 + 1; // idx + if + addr
842 }
843
844 return;
845
846 senderror:
847 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
848 exit(1);
849 }
850
851 // set up LAC UDP ports
852 static void initlacudp(void)
853 {
854 int on = 1;
855 struct sockaddr_in addr;
856
857 // Tunnel to Remote LNS
858 memset(&addr, 0, sizeof(addr));
859 addr.sin_family = AF_INET;
860 addr.sin_port = htons(config->bind_portremotelns);
861 addr.sin_addr.s_addr = config->bind_address_remotelns;
862 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
863 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
864 {
865 int flags = fcntl(udplacfd, F_GETFL, 0);
866 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
867 }
868 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
869 {
870 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
871 exit(1);
872 }
873 }
874
875 // set up control ports
876 static void initcontrol(void)
877 {
878 int on = 1;
879 struct sockaddr_in addr;
880
881 // Control
882 memset(&addr, 0, sizeof(addr));
883 addr.sin_family = AF_INET;
884 addr.sin_port = htons(NSCTL_PORT);
885 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
886 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
887 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
888 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
889 {
890 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
891 exit(1);
892 }
893 }
894
895 // set up Dynamic Authorization Extensions to RADIUS port
896 static void initdae(void)
897 {
898 int on = 1;
899 struct sockaddr_in addr;
900
901 // Dynamic Authorization Extensions to RADIUS
902 memset(&addr, 0, sizeof(addr));
903 addr.sin_family = AF_INET;
904 addr.sin_port = htons(config->radius_dae_port);
905 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
906 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
907 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
908 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
909 {
910 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
911 exit(1);
912 }
913 }
914
915 // set up UDP ports
916 static void initudp(int * pudpfd, in_addr_t ip_bind)
917 {
918 int on = 1;
919 struct sockaddr_in addr;
920
921 // Tunnel
922 memset(&addr, 0, sizeof(addr));
923 addr.sin_family = AF_INET;
924 addr.sin_port = htons(L2TPPORT);
925 addr.sin_addr.s_addr = ip_bind;
926 (*pudpfd) = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
927 setsockopt((*pudpfd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
928 {
929 int flags = fcntl((*pudpfd), F_GETFL, 0);
930 fcntl((*pudpfd), F_SETFL, flags | O_NONBLOCK);
931 }
932 if (bind((*pudpfd), (struct sockaddr *) &addr, sizeof(addr)) < 0)
933 {
934 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
935 exit(1);
936 }
937 }
938
939 //
940 // Find session by IP, < 1 for not found
941 //
942 // Confusingly enough, this 'ip' must be
943 // in _network_ order. This being the common
944 // case when looking it up from IP packet headers.
945 //
946 // We actually use this cache for two things.
947 // #1. For used IP addresses, this maps to the
948 // session ID that it's used by.
949 // #2. For un-used IP addresses, this maps to the
950 // index into the pool table that contains that
951 // IP address.
952 //
953
954 static sessionidt lookup_ipmap(in_addr_t ip)
955 {
956 uint8_t *a = (uint8_t *) &ip;
957 union iphash *h = ip_hash;
958
959 if (!(h = h[*a++].idx)) return 0;
960 if (!(h = h[*a++].idx)) return 0;
961 if (!(h = h[*a++].idx)) return 0;
962
963 return h[*a].sess;
964 }
965
966 static sessionidt lookup_ipv6map(struct in6_addr ip)
967 {
968 struct ipv6radix *curnode;
969 int i;
970 int s;
971 char ipv6addr[INET6_ADDRSTRLEN];
972
973 curnode = &ipv6_hash[ip.s6_addr[0]];
974 i = 1;
975 s = curnode->sess;
976
977 while (s == 0 && i < 15 && curnode->branch != NULL)
978 {
979 curnode = &curnode->branch[ip.s6_addr[i]];
980 s = curnode->sess;
981 i++;
982 }
983
984 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
985 inet_ntop(AF_INET6, &ip, ipv6addr,
986 INET6_ADDRSTRLEN),
987 s);
988
989 return s;
990 }
991
992 sessionidt sessionbyip(in_addr_t ip)
993 {
994 sessionidt s = lookup_ipmap(ip);
995 CSTAT(sessionbyip);
996
997 if (s > 0 && s < MAXSESSION && session[s].opened)
998 return s;
999
1000 return 0;
1001 }
1002
1003 sessionidt sessionbyipv6(struct in6_addr ip)
1004 {
1005 sessionidt s;
1006 CSTAT(sessionbyipv6);
1007
1008 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
1009 (ip.s6_addr[0] == 0xFE &&
1010 ip.s6_addr[1] == 0x80 &&
1011 ip.s6_addr16[1] == 0 &&
1012 ip.s6_addr16[2] == 0 &&
1013 ip.s6_addr16[3] == 0)) {
1014 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
1015 } else {
1016 s = lookup_ipv6map(ip);
1017 }
1018
1019 if (s > 0 && s < MAXSESSION && session[s].opened)
1020 return s;
1021
1022 return 0;
1023 }
1024
1025 //
1026 // Take an IP address in HOST byte order and
1027 // add it to the sessionid by IP cache.
1028 //
1029 // (It's actually cached in network order)
1030 //
1031 void cache_ipmap(in_addr_t ip, sessionidt s)
1032 {
1033 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1034 uint8_t *a = (uint8_t *) &nip;
1035 union iphash *h = ip_hash;
1036 int i;
1037
1038 for (i = 0; i < 3; i++)
1039 {
1040 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1041 return;
1042
1043 h = h[a[i]].idx;
1044 }
1045
1046 h[a[3]].sess = s;
1047
1048 if (s > 0)
1049 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1050
1051 else if (s == 0)
1052 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1053 // else a map to an ip pool index.
1054 }
1055
1056 static void uncache_ipmap(in_addr_t ip)
1057 {
1058 cache_ipmap(ip, 0); // Assign it to the NULL session.
1059 }
1060
1061 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1062 {
1063 int i;
1064 int bytes;
1065 struct ipv6radix *curnode;
1066 char ipv6addr[INET6_ADDRSTRLEN];
1067
1068 curnode = &ipv6_hash[ip.s6_addr[0]];
1069
1070 bytes = prefixlen >> 3;
1071 i = 1;
1072 while (i < bytes) {
1073 if (curnode->branch == NULL)
1074 {
1075 if (!(curnode->branch = calloc(256,
1076 sizeof (struct ipv6radix))))
1077 return;
1078 }
1079 curnode = &curnode->branch[ip.s6_addr[i]];
1080 i++;
1081 }
1082
1083 curnode->sess = s;
1084
1085 if (s > 0)
1086 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1087 inet_ntop(AF_INET6, &ip, ipv6addr,
1088 INET6_ADDRSTRLEN),
1089 prefixlen);
1090 else if (s == 0)
1091 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1092 inet_ntop(AF_INET6, &ip, ipv6addr,
1093 INET6_ADDRSTRLEN),
1094 prefixlen);
1095 }
1096
1097 //
1098 // CLI list to dump current ipcache.
1099 //
1100 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1101 {
1102 union iphash *d = ip_hash, *e, *f, *g;
1103 int i, j, k, l;
1104 int count = 0;
1105
1106 if (CLI_HELP_REQUESTED)
1107 return CLI_HELP_NO_ARGS;
1108
1109 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1110
1111 for (i = 0; i < 256; ++i)
1112 {
1113 if (!d[i].idx)
1114 continue;
1115
1116 e = d[i].idx;
1117 for (j = 0; j < 256; ++j)
1118 {
1119 if (!e[j].idx)
1120 continue;
1121
1122 f = e[j].idx;
1123 for (k = 0; k < 256; ++k)
1124 {
1125 if (!f[k].idx)
1126 continue;
1127
1128 g = f[k].idx;
1129 for (l = 0; l < 256; ++l)
1130 {
1131 if (!g[l].sess)
1132 continue;
1133
1134 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1135 ++count;
1136 }
1137 }
1138 }
1139 }
1140 cli_print(cli, "%d entries in cache", count);
1141 return CLI_OK;
1142 }
1143
1144
1145 // Find session by username, 0 for not found
1146 // walled garden users aren't authenticated, so the username is
1147 // reasonably useless. Ignore them to avoid incorrect actions
1148 //
1149 // This is VERY inefficent. Don't call it often. :)
1150 //
1151 sessionidt sessionbyuser(char *username)
1152 {
1153 int s;
1154 CSTAT(sessionbyuser);
1155
1156 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1157 {
1158 if (!session[s].opened)
1159 continue;
1160
1161 if (session[s].walled_garden)
1162 continue; // Skip walled garden users.
1163
1164 if (!strncmp(session[s].user, username, 128))
1165 return s;
1166
1167 }
1168 return 0; // Not found.
1169 }
1170
1171 void send_garp(in_addr_t ip)
1172 {
1173 int s;
1174 struct ifreq ifr;
1175 uint8_t mac[6];
1176
1177 s = socket(PF_INET, SOCK_DGRAM, 0);
1178 if (s < 0)
1179 {
1180 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1181 return;
1182 }
1183 memset(&ifr, 0, sizeof(ifr));
1184 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1185 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1186 {
1187 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1188 close(s);
1189 return;
1190 }
1191 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1192 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1193 {
1194 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1195 close(s);
1196 return;
1197 }
1198 close(s);
1199 sendarp(ifr.ifr_ifindex, mac, ip);
1200 }
1201
1202 static sessiont *sessiontbysessionidt(sessionidt s)
1203 {
1204 if (!s || s >= MAXSESSION) return NULL;
1205 return &session[s];
1206 }
1207
1208 static sessionidt sessionidtbysessiont(sessiont *s)
1209 {
1210 sessionidt val = s-session;
1211 if (s < session || val >= MAXSESSION) return 0;
1212 return val;
1213 }
1214
1215 // actually send a control message for a specific tunnel
1216 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1217 {
1218 struct sockaddr_in addr;
1219
1220 CSTAT(tunnelsend);
1221
1222 if (!t)
1223 {
1224 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1225 STAT(tunnel_tx_errors);
1226 return;
1227 }
1228
1229 if (t == TUNNEL_ID_PPPOE)
1230 {
1231 pppoe_sess_send(buf, l, t);
1232 return;
1233 }
1234
1235 if (!tunnel[t].ip)
1236 {
1237 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1238 STAT(tunnel_tx_errors);
1239 return;
1240 }
1241
1242 memset(&addr, 0, sizeof(addr));
1243 addr.sin_family = AF_INET;
1244 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1245 addr.sin_port = htons(tunnel[t].port);
1246
1247 // sequence expected, if sequence in message
1248 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1249
1250 // If this is a control message, deal with retries
1251 if (*buf & 0x80)
1252 {
1253 tunnel[t].last = time_now; // control message sent
1254 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1255 if (tunnel[t].try)
1256 {
1257 STAT(tunnel_retries);
1258 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1259 }
1260 }
1261
1262 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1263 {
1264 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1265 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1266 STAT(tunnel_tx_errors);
1267 return;
1268 }
1269
1270 LOG_HEX(5, "Send Tunnel Data", buf, l);
1271 STAT(tunnel_tx_packets);
1272 INC_STAT(tunnel_tx_bytes, l);
1273 }
1274
1275 //
1276 // Tiny helper function to write data to
1277 // the 'tun' device.
1278 //
1279 int tun_write(uint8_t * data, int size)
1280 {
1281 return write(tunfd, data, size);
1282 }
1283
1284 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1285 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1286 {
1287 int d = (tcp[12] >> 4) * 4;
1288 uint8_t *mss = 0;
1289 uint8_t *opts;
1290 uint8_t *data;
1291 uint16_t orig;
1292 uint32_t sum;
1293
1294 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1295 return;
1296
1297 if (tcp + d > buf + len) // short?
1298 return;
1299
1300 opts = tcp + 20;
1301 data = tcp + d;
1302
1303 while (opts < data)
1304 {
1305 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1306 {
1307 mss = opts + 2;
1308 if (mss + 2 > data) return; // short?
1309 break;
1310 }
1311
1312 if (*opts == 0) return; // end of options
1313 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1314 opts++;
1315 else
1316 opts += opts[1]; // skip over option
1317 }
1318
1319 if (!mss) return; // not found
1320 orig = ntohs(*(uint16_t *) mss);
1321
1322 if (orig <= MSS) return; // mss OK
1323
1324 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1325 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1326 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1327 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1328
1329 // set mss
1330 *(int16_t *) mss = htons(MSS);
1331
1332 // adjust checksum (see rfc1141)
1333 sum = orig + (~MSS & 0xffff);
1334 sum += ntohs(*(uint16_t *) (tcp + 16));
1335 sum = (sum & 0xffff) + (sum >> 16);
1336 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1337 }
1338
1339 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1340 {
1341 uint16_t proto;
1342 if (extra) {
1343 // Skip the four extra bytes
1344 p += 4;
1345 l -= 4;
1346 }
1347
1348 if (*p & 1)
1349 {
1350 proto = *p++;
1351 l--;
1352 }
1353 else
1354 {
1355 proto = ntohs(*(uint16_t *) p);
1356 p += 2;
1357 l -= 2;
1358 }
1359 if (proto == PPPIP)
1360 {
1361 if (session[s].die)
1362 {
1363 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1364 return; // closing session, PPP not processed
1365 }
1366 session[s].last_packet = session[s].last_data = time_now;
1367 processipin(s, t, p, l);
1368 }
1369 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1370 {
1371 if (session[s].die)
1372 {
1373 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1374 return; // closing session, PPP not processed
1375 }
1376
1377 session[s].last_packet = session[s].last_data = time_now;
1378 processipv6in(s, t, p, l);
1379 }
1380 else if (proto == PPPIPCP)
1381 {
1382 session[s].last_packet = session[s].last_data = time_now;
1383 processipcp(s, t, p, l);
1384 }
1385 else if (proto == PPPCCP)
1386 {
1387 session[s].last_packet = session[s].last_data = time_now;
1388 processccp(s, t, p, l);
1389 }
1390 else
1391 {
1392 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1393 }
1394 }
1395
1396 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1397 {
1398 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1399 sp->cout_delta += len;
1400 sp->pout++;
1401 sp->last_data = time_now;
1402
1403 sess_local[s].cout += len; // To send to master..
1404 sess_local[s].pout++;
1405 }
1406
1407 // process outgoing (to tunnel) IP
1408 //
1409 // (i.e. this routine writes to data[-8]).
1410 void processipout(uint8_t *buf, int len)
1411 {
1412 sessionidt s;
1413 groupidt g;
1414 sessiont *sp;
1415 tunnelidt t;
1416 in_addr_t ip, ip_src;
1417
1418 uint8_t *data = buf; // Keep a copy of the originals.
1419 int size = len;
1420
1421 uint8_t fragbuf[MAXETHER + 20];
1422
1423 CSTAT(processipout);
1424
1425 if (len < MIN_IP_SIZE)
1426 {
1427 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1428 STAT(tun_rx_errors);
1429 return;
1430 }
1431 if (len >= MAXETHER)
1432 {
1433 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1434 STAT(tun_rx_errors);
1435 return;
1436 }
1437
1438 // Skip the tun header
1439 buf += 4;
1440 len -= 4;
1441
1442 // Got an IP header now
1443 if (*(uint8_t *)(buf) >> 4 != 4)
1444 {
1445 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1446 return;
1447 }
1448
1449 ip_src = *(uint32_t *)(buf + 12);
1450 ip = *(uint32_t *)(buf + 16);
1451 if ((g = grp_groupbyip(ip)))
1452 {
1453 s = grp_getnextsession(g, ip, ip_src);
1454 if (!s)
1455 {
1456 // Is this a packet for a session that doesn't exist?
1457 static int rate = 0; // Number of ICMP packets we've sent this second.
1458 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1459
1460 if (last != time_now)
1461 {
1462 last = time_now;
1463 rate = 0;
1464 }
1465
1466 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1467 {
1468 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1469 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1470 config->bind_address ? config->bind_address : my_address, buf, len);
1471 }
1472 return;
1473 }
1474 }
1475 else if (!(s = sessionbyip(ip)))
1476 {
1477 // Is this a packet for a session that doesn't exist?
1478 static int rate = 0; // Number of ICMP packets we've sent this second.
1479 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1480
1481 if (last != time_now)
1482 {
1483 last = time_now;
1484 rate = 0;
1485 }
1486
1487 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1488 {
1489 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1490 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1491 config->bind_address ? config->bind_address : my_address, buf, len);
1492 }
1493 return;
1494 }
1495
1496 t = session[s].tunnel;
1497 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1498 {
1499 LOG(3, s, t, "Packet size more than session MRU\n");
1500 return;
1501 }
1502
1503 sp = &session[s];
1504
1505 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1506 if (config->max_packets > 0)
1507 {
1508 if (sess_local[s].last_packet_out == TIME)
1509 {
1510 int max = config->max_packets;
1511
1512 // All packets for throttled sessions are handled by the
1513 // master, so further limit by using the throttle rate.
1514 // A bit of a kludge, since throttle rate is in kbps,
1515 // but should still be generous given our average DSL
1516 // packet size is 200 bytes: a limit of 28kbps equates
1517 // to around 180 packets per second.
1518 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1519 max = sp->throttle_out;
1520
1521 if (++sess_local[s].packets_out > max)
1522 {
1523 sess_local[s].packets_dropped++;
1524 return;
1525 }
1526 }
1527 else
1528 {
1529 if (sess_local[s].packets_dropped)
1530 {
1531 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1532 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1533 sess_local[s].packets_dropped, sess_local[s].packets_out,
1534 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1535 sp->user);
1536 }
1537
1538 sess_local[s].last_packet_out = TIME;
1539 sess_local[s].packets_out = 1;
1540 sess_local[s].packets_dropped = 0;
1541 }
1542 }
1543
1544 // run access-list if any
1545 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1546 return;
1547
1548 // adjust MSS on SYN and SYN,ACK packets with options
1549 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1550 {
1551 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1552 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1553 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1554 }
1555
1556 if (sp->tbf_out)
1557 {
1558 // Are we throttling this session?
1559 if (config->cluster_iam_master)
1560 tbf_queue_packet(sp->tbf_out, data, size);
1561 else
1562 master_throttle_packet(sp->tbf_out, data, size);
1563 return;
1564 }
1565
1566 if (sp->walled_garden && !config->cluster_iam_master)
1567 {
1568 // We are walled-gardening this
1569 master_garden_packet(s, data, size);
1570 return;
1571 }
1572
1573 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1574 {
1575
1576 if (!config->cluster_iam_master)
1577 {
1578 // The MPPP packets must be managed by the Master.
1579 master_forward_mppp_packet(s, data, size);
1580 return;
1581 }
1582
1583 // Add on L2TP header
1584 sessionidt members[MAXBUNDLESES];
1585 bundleidt bid = session[s].bundle;
1586 bundlet *b = &bundle[bid];
1587 uint32_t num_of_links, nb_opened;
1588 int i;
1589
1590 num_of_links = b->num_of_links;
1591 nb_opened = 0;
1592 for (i = 0;i < num_of_links;i++)
1593 {
1594 s = b->members[i];
1595 if (session[s].ppp.lcp == Opened)
1596 {
1597 members[nb_opened] = s;
1598 nb_opened++;
1599 }
1600 }
1601
1602 if (nb_opened < 1)
1603 {
1604 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1605 return;
1606 }
1607
1608 num_of_links = nb_opened;
1609 b->current_ses = (b->current_ses + 1) % num_of_links;
1610 s = members[b->current_ses];
1611 t = session[s].tunnel;
1612 sp = &session[s];
1613 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1614
1615 if (num_of_links > 1)
1616 {
1617 if(len > MINFRAGLEN)
1618 {
1619 //for rotate traffic among the member links
1620 uint32_t divisor = num_of_links;
1621 if (divisor > 2)
1622 divisor = divisor/2 + (divisor & 1);
1623
1624 // Partition the packet to "num_of_links" fragments
1625 uint32_t fraglen = len / divisor;
1626 uint32_t last_fraglen = fraglen + len % divisor;
1627 uint32_t remain = len;
1628
1629 // send the first packet
1630 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1631 if (!p) return;
1632 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1633
1634 // statistics
1635 update_session_out_stat(s, sp, fraglen);
1636
1637 remain -= fraglen;
1638 while (remain > last_fraglen)
1639 {
1640 b->current_ses = (b->current_ses + 1) % num_of_links;
1641 s = members[b->current_ses];
1642 t = session[s].tunnel;
1643 sp = &session[s];
1644 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1645 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1646 if (!p) return;
1647 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1648 update_session_out_stat(s, sp, fraglen);
1649 remain -= fraglen;
1650 }
1651 // send the last fragment
1652 b->current_ses = (b->current_ses + 1) % num_of_links;
1653 s = members[b->current_ses];
1654 t = session[s].tunnel;
1655 sp = &session[s];
1656 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1657 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1658 if (!p) return;
1659 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1660 update_session_out_stat(s, sp, remain);
1661 if (remain != last_fraglen)
1662 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1663 }
1664 else
1665 {
1666 // Send it as one frame
1667 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1668 if (!p) return;
1669 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1670 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1671 update_session_out_stat(s, sp, len);
1672 }
1673 }
1674 else
1675 {
1676 // Send it as one frame (NO MPPP Frame)
1677 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1678 tunnelsend(p, len + (buf-p), t); // send it...
1679 update_session_out_stat(s, sp, len);
1680 }
1681 }
1682 else
1683 {
1684 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1685 tunnelsend(p, len + (buf-p), t); // send it...
1686 update_session_out_stat(s, sp, len);
1687 }
1688
1689 // Snooping this session, send it to intercept box
1690 if (sp->snoop_ip && sp->snoop_port)
1691 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1692
1693 udp_tx += len;
1694 }
1695
1696 // process outgoing (to tunnel) IPv6
1697 //
1698 static void processipv6out(uint8_t * buf, int len)
1699 {
1700 sessionidt s;
1701 sessiont *sp;
1702 tunnelidt t;
1703 in_addr_t ip;
1704 struct in6_addr ip6;
1705
1706 uint8_t *data = buf; // Keep a copy of the originals.
1707 int size = len;
1708
1709 uint8_t b[MAXETHER + 20];
1710
1711 CSTAT(processipv6out);
1712
1713 if (len < MIN_IP_SIZE)
1714 {
1715 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1716 STAT(tunnel_tx_errors);
1717 return;
1718 }
1719 if (len >= MAXETHER)
1720 {
1721 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1722 STAT(tunnel_tx_errors);
1723 return;
1724 }
1725
1726 // Skip the tun header
1727 buf += 4;
1728 len -= 4;
1729
1730 // Got an IP header now
1731 if (*(uint8_t *)(buf) >> 4 != 6)
1732 {
1733 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1734 return;
1735 }
1736
1737 ip6 = *(struct in6_addr *)(buf+24);
1738 s = sessionbyipv6(ip6);
1739
1740 if (s == 0)
1741 {
1742 ip = *(uint32_t *)(buf + 32);
1743 s = sessionbyip(ip);
1744 }
1745
1746 if (s == 0)
1747 {
1748 // Is this a packet for a session that doesn't exist?
1749 static int rate = 0; // Number of ICMP packets we've sent this second.
1750 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1751
1752 if (last != time_now)
1753 {
1754 last = time_now;
1755 rate = 0;
1756 }
1757
1758 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1759 {
1760 // FIXME: Should send icmp6 host unreachable
1761 }
1762 return;
1763 }
1764 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1765 {
1766 bundleidt bid = session[s].bundle;
1767 bundlet *b = &bundle[bid];
1768
1769 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1770 s = b->members[b->current_ses];
1771 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1772 }
1773 t = session[s].tunnel;
1774 sp = &session[s];
1775 sp->last_data = time_now;
1776
1777 // FIXME: add DoS prevention/filters?
1778
1779 if (sp->tbf_out)
1780 {
1781 // Are we throttling this session?
1782 if (config->cluster_iam_master)
1783 tbf_queue_packet(sp->tbf_out, data, size);
1784 else
1785 master_throttle_packet(sp->tbf_out, data, size);
1786 return;
1787 }
1788 else if (sp->walled_garden && !config->cluster_iam_master)
1789 {
1790 // We are walled-gardening this
1791 master_garden_packet(s, data, size);
1792 return;
1793 }
1794
1795 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1796
1797 // Add on L2TP header
1798 {
1799 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1800 if (!p) return;
1801 tunnelsend(b, len + (p-b), t); // send it...
1802 }
1803
1804 // Snooping this session, send it to intercept box
1805 if (sp->snoop_ip && sp->snoop_port)
1806 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1807
1808 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1809 sp->cout_delta += len;
1810 sp->pout++;
1811 udp_tx += len;
1812
1813 sess_local[s].cout += len; // To send to master..
1814 sess_local[s].pout++;
1815 }
1816
1817 //
1818 // Helper routine for the TBF filters.
1819 // Used to send queued data in to the user!
1820 //
1821 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1822 {
1823 sessiont *sp;
1824 tunnelidt t;
1825
1826 uint8_t b[MAXETHER + 20];
1827
1828 if (len < 0 || len > MAXETHER)
1829 {
1830 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1831 return;
1832 }
1833
1834 // Skip the tun header
1835 buf += 4;
1836 len -= 4;
1837
1838 if (!session[s].ip)
1839 return;
1840
1841 t = session[s].tunnel;
1842 sp = &session[s];
1843
1844 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1845
1846 // Add on L2TP header
1847 {
1848 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1849 if (!p) return;
1850 tunnelsend(b, len + (p-b), t); // send it...
1851 }
1852
1853 // Snooping this session.
1854 if (sp->snoop_ip && sp->snoop_port)
1855 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1856
1857 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1858 sp->cout_delta += len;
1859 sp->pout++;
1860 udp_tx += len;
1861
1862 sess_local[s].cout += len; // To send to master..
1863 sess_local[s].pout++;
1864 }
1865
1866 // add an AVP (16 bit)
1867 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1868 {
1869 uint16_t l = (m ? 0x8008 : 0x0008);
1870 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1871 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1872 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1873 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1874 c->length += 8;
1875 }
1876
1877 // add an AVP (32 bit)
1878 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1879 {
1880 uint16_t l = (m ? 0x800A : 0x000A);
1881 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1882 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1883 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1884 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1885 c->length += 10;
1886 }
1887
1888 // add an AVP (string)
1889 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1890 {
1891 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1892 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1893 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1894 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1895 memcpy(c->buf + c->length + 6, val, strlen(val));
1896 c->length += 6 + strlen(val);
1897 }
1898
1899 // add a binary AVP
1900 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1901 {
1902 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1903 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1904 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1905 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1906 memcpy(c->buf + c->length + 6, val, len);
1907 c->length += 6 + len;
1908 }
1909
1910 // new control connection
1911 static controlt *controlnew(uint16_t mtype)
1912 {
1913 controlt *c;
1914 if (!controlfree)
1915 c = malloc(sizeof(controlt));
1916 else
1917 {
1918 c = controlfree;
1919 controlfree = c->next;
1920 }
1921 assert(c);
1922 c->next = 0;
1923 c->buf[0] = 0xC8; // flags
1924 c->buf[1] = 0x02; // ver
1925 c->length = 12;
1926 control16(c, 0, mtype, 1);
1927 return c;
1928 }
1929
1930 // send zero block if nothing is waiting
1931 // (ZLB send).
1932 static void controlnull(tunnelidt t)
1933 {
1934 uint16_t buf[6];
1935 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1936 return;
1937
1938 buf[0] = htons(0xC802); // flags/ver
1939 buf[1] = htons(12); // length
1940 buf[2] = htons(tunnel[t].far); // tunnel
1941 buf[3] = htons(0); // session
1942 buf[4] = htons(tunnel[t].ns); // sequence
1943 buf[5] = htons(tunnel[t].nr); // sequence
1944 tunnelsend((uint8_t *)buf, 12, t);
1945 }
1946
1947 // add a control message to a tunnel, and send if within window
1948 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1949 {
1950 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1951 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1952 *(uint16_t *) (c->buf + 6) = htons(far); // session
1953 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1954 tunnel[t].ns++; // advance sequence
1955 // link in message in to queue
1956 if (tunnel[t].controlc)
1957 tunnel[t].controle->next = c;
1958 else
1959 tunnel[t].controls = c;
1960
1961 tunnel[t].controle = c;
1962 tunnel[t].controlc++;
1963
1964 // send now if space in window
1965 if (tunnel[t].controlc <= tunnel[t].window)
1966 {
1967 tunnel[t].try = 0; // first send
1968 tunnelsend(c->buf, c->length, t);
1969 }
1970 }
1971
1972 //
1973 // Throttle or Unthrottle a session
1974 //
1975 // Throttle the data from/to through a session to no more than
1976 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1977 // user).
1978 //
1979 // If either value is -1, the current value is retained for that
1980 // direction.
1981 //
1982 void throttle_session(sessionidt s, int rate_in, int rate_out)
1983 {
1984 if (!session[s].opened)
1985 return; // No-one home.
1986
1987 if (!*session[s].user)
1988 return; // User not logged in
1989
1990 if (rate_in >= 0)
1991 {
1992 int bytes = rate_in * 1024 / 8; // kbits to bytes
1993 if (session[s].tbf_in)
1994 free_tbf(session[s].tbf_in);
1995
1996 if (rate_in > 0)
1997 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1998 else
1999 session[s].tbf_in = 0;
2000
2001 session[s].throttle_in = rate_in;
2002 }
2003
2004 if (rate_out >= 0)
2005 {
2006 int bytes = rate_out * 1024 / 8;
2007 if (session[s].tbf_out)
2008 free_tbf(session[s].tbf_out);
2009
2010 if (rate_out > 0)
2011 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
2012 else
2013 session[s].tbf_out = 0;
2014
2015 session[s].throttle_out = rate_out;
2016 }
2017 }
2018
2019 // add/remove filters from session (-1 = no change)
2020 void filter_session(sessionidt s, int filter_in, int filter_out)
2021 {
2022 if (!session[s].opened)
2023 return; // No-one home.
2024
2025 if (!*session[s].user)
2026 return; // User not logged in
2027
2028 // paranoia
2029 if (filter_in > MAXFILTER) filter_in = -1;
2030 if (filter_out > MAXFILTER) filter_out = -1;
2031 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2032 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2033
2034 if (filter_in >= 0)
2035 {
2036 if (session[s].filter_in)
2037 ip_filters[session[s].filter_in - 1].used--;
2038
2039 if (filter_in > 0)
2040 ip_filters[filter_in - 1].used++;
2041
2042 session[s].filter_in = filter_in;
2043 }
2044
2045 if (filter_out >= 0)
2046 {
2047 if (session[s].filter_out)
2048 ip_filters[session[s].filter_out - 1].used--;
2049
2050 if (filter_out > 0)
2051 ip_filters[filter_out - 1].used++;
2052
2053 session[s].filter_out = filter_out;
2054 }
2055 }
2056
2057 // start tidy shutdown of session
2058 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2059 {
2060 int walled_garden = session[s].walled_garden;
2061 bundleidt b = session[s].bundle;
2062 //delete routes only for last session in bundle (in case of MPPP)
2063 int del_routes = !b || (bundle[b].num_of_links == 1);
2064
2065 CSTAT(sessionshutdown);
2066
2067 if (!session[s].opened)
2068 {
2069 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2070 return; // not a live session
2071 }
2072
2073 if (!session[s].die)
2074 {
2075 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2076 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2077 run_plugins(PLUGIN_KILL_SESSION, &data);
2078 }
2079
2080 if (session[s].ip && !walled_garden && !session[s].die)
2081 {
2082 // RADIUS Stop message
2083 uint16_t r = radiusnew(s);
2084 if (r)
2085 {
2086 // stop, if not already trying
2087 if (radius[r].state != RADIUSSTOP)
2088 {
2089 radius[r].term_cause = term_cause;
2090 radius[r].term_msg = reason;
2091 radiussend(r, RADIUSSTOP);
2092 }
2093 }
2094 else
2095 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2096
2097 // Save counters to dump to accounting file
2098 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2099 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2100 }
2101
2102 if (!session[s].die)
2103 session[s].die = TIME + 150; // Clean up in 15 seconds
2104
2105 if (session[s].ip)
2106 { // IP allocated, clear and unroute
2107 int r;
2108 int routed = 0;
2109 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2110 {
2111 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2112 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2113 routed++;
2114
2115 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2116 session[s].route[r].ip = 0;
2117 }
2118
2119 if (session[s].ip_pool_index == -1) // static ip
2120 {
2121 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2122 session[s].ip = 0;
2123 }
2124 else
2125 free_ip_address(s);
2126
2127 // unroute IPv6, if setup
2128 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2129 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2130
2131 if (b)
2132 {
2133 // This session was part of a bundle
2134 bundle[b].num_of_links--;
2135 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2136 if(bundle[b].num_of_links == 0)
2137 {
2138 bundleclear(b);
2139 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2140 }
2141 else
2142 {
2143 // Adjust the members array to accomodate the new change
2144 uint8_t mem_num = 0;
2145 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2146 if(bundle[b].members[bundle[b].num_of_links] != s)
2147 {
2148 uint8_t ml;
2149 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2150 if(bundle[b].members[ml] == s)
2151 {
2152 mem_num = ml;
2153 break;
2154 }
2155 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2156 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2157
2158 // If the killed session is the first of the bundle,
2159 // the new first session must be stored in the cache_ipmap
2160 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2161 if (mem_num == 0)
2162 {
2163 sessionidt new_s = bundle[b].members[0];
2164
2165 routed = 0;
2166 // Add the route for this session.
2167 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2168 {
2169 int i, prefixlen;
2170 in_addr_t ip;
2171
2172 prefixlen = session[new_s].route[r].prefixlen;
2173 ip = session[new_s].route[r].ip;
2174
2175 if (!prefixlen) prefixlen = 32;
2176 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2177
2178 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2179 cache_ipmap(i, new_s);
2180 }
2181 cache_ipmap(session[new_s].ip, new_s);
2182
2183 // IPV6 route
2184 if (session[new_s].ipv6prefixlen)
2185 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2186 }
2187 }
2188 }
2189
2190 cluster_send_bundle(b);
2191 }
2192 }
2193
2194 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2195 throttle_session(s, 0, 0);
2196
2197 if (cdn_result)
2198 {
2199 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2200 {
2201 pppoe_shutdown_session(s);
2202 }
2203 else
2204 {
2205 // Send CDN
2206 controlt *c = controlnew(14); // sending CDN
2207 if (cdn_error)
2208 {
2209 uint16_t buf[2];
2210 buf[0] = htons(cdn_result);
2211 buf[1] = htons(cdn_error);
2212 controlb(c, 1, (uint8_t *)buf, 4, 1);
2213 }
2214 else
2215 control16(c, 1, cdn_result, 1);
2216
2217 control16(c, 14, s, 1); // assigned session (our end)
2218 controladd(c, session[s].far, session[s].tunnel); // send the message
2219 }
2220 }
2221
2222 // update filter refcounts
2223 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2224 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2225
2226 // clear PPP state
2227 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2228 sess_local[s].lcp.restart = 0;
2229 sess_local[s].ipcp.restart = 0;
2230 sess_local[s].ipv6cp.restart = 0;
2231 sess_local[s].ccp.restart = 0;
2232
2233 cluster_send_session(s);
2234 }
2235
2236 void sendipcp(sessionidt s, tunnelidt t)
2237 {
2238 uint8_t buf[MAXETHER];
2239 uint8_t *q;
2240
2241 CSTAT(sendipcp);
2242 LOG(3, s, t, "IPCP: send ConfigReq\n");
2243
2244 if (!session[s].unique_id)
2245 {
2246 if (!++last_id) ++last_id; // skip zero
2247 session[s].unique_id = last_id;
2248 }
2249
2250 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2251 if (!q) return;
2252
2253 *q = ConfigReq;
2254 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2255 *(uint16_t *) (q + 2) = htons(10); // packet length
2256 q[4] = 3; // ip address option
2257 q[5] = 6; // option length
2258 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2259 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2260 my_address; // send my IP
2261
2262 tunnelsend(buf, 10 + (q - buf), t); // send it
2263 restart_timer(s, ipcp);
2264 }
2265
2266 void sendipv6cp(sessionidt s, tunnelidt t)
2267 {
2268 uint8_t buf[MAXETHER];
2269 uint8_t *q;
2270
2271 CSTAT(sendipv6cp);
2272 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2273
2274 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2275 if (!q) return;
2276
2277 *q = ConfigReq;
2278 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2279 // only send one type
2280 // of request
2281 *(uint16_t *) (q + 2) = htons(14);
2282 q[4] = 1; // interface identifier option
2283 q[5] = 10; // option length
2284 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2285 *(uint32_t *) (q + 10) = 0;
2286 q[13] = 1;
2287
2288 tunnelsend(buf, 14 + (q - buf), t); // send it
2289 restart_timer(s, ipv6cp);
2290 }
2291
2292 static void sessionclear(sessionidt s)
2293 {
2294 memset(&session[s], 0, sizeof(session[s]));
2295 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2296 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2297
2298 session[s].tunnel = T_FREE; // Mark it as free.
2299 session[s].next = sessionfree;
2300 sessionfree = s;
2301 }
2302
2303 // kill a session now
2304 void sessionkill(sessionidt s, char *reason)
2305 {
2306 groupidt g;
2307
2308 CSTAT(sessionkill);
2309
2310 if (!session[s].opened) // not alive
2311 return;
2312
2313 if (session[s].next)
2314 {
2315 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2316 return;
2317 }
2318
2319 if (!session[s].die)
2320 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2321
2322 if (sess_local[s].radius)
2323 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2324
2325 if (session[s].forwardtosession)
2326 {
2327 sessionidt sess = session[s].forwardtosession;
2328 if (session[sess].forwardtosession == s)
2329 {
2330 // Shutdown the linked session also.
2331 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2332 }
2333 }
2334
2335 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2336
2337 if ((g = grp_groupbysession(s)))
2338 {
2339 grp_removesession(g, s);
2340 }
2341
2342 sessionclear(s);
2343 cluster_send_session(s);
2344 }
2345
2346 static void tunnelclear(tunnelidt t)
2347 {
2348 if (!t) return;
2349 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2350 tunnel[t].state = TUNNELFREE;
2351 }
2352
2353 static void bundleclear(bundleidt b)
2354 {
2355 if (!b) return;
2356 memset(&bundle[b], 0, sizeof(bundle[b]));
2357 bundle[b].state = BUNDLEFREE;
2358 }
2359
2360 // kill a tunnel now
2361 static void tunnelkill(tunnelidt t, char *reason)
2362 {
2363 sessionidt s;
2364 controlt *c;
2365
2366 CSTAT(tunnelkill);
2367
2368 tunnel[t].state = TUNNELDIE;
2369
2370 // free control messages
2371 while ((c = tunnel[t].controls))
2372 {
2373 controlt * n = c->next;
2374 tunnel[t].controls = n;
2375 tunnel[t].controlc--;
2376 c->next = controlfree;
2377 controlfree = c;
2378 }
2379 // kill sessions
2380 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2381 if (session[s].tunnel == t)
2382 sessionkill(s, reason);
2383
2384 // free tunnel
2385 tunnelclear(t);
2386 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2387 cli_tunnel_actions[t].action = 0;
2388 cluster_send_tunnel(t);
2389 }
2390
2391 // shut down a tunnel cleanly
2392 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2393 {
2394 sessionidt s;
2395
2396 CSTAT(tunnelshutdown);
2397
2398 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2399 {
2400 // never set up, can immediately kill
2401 tunnelkill(t, reason);
2402 return;
2403 }
2404 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2405
2406 // close session
2407 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2408 if (session[s].tunnel == t)
2409 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2410
2411 tunnel[t].state = TUNNELDIE;
2412 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2413 cluster_send_tunnel(t);
2414 // TBA - should we wait for sessions to stop?
2415 if (result)
2416 {
2417 controlt *c = controlnew(4); // sending StopCCN
2418 if (error)
2419 {
2420 uint16_t buf[32];
2421 int l = 4;
2422 buf[0] = htons(result);
2423 buf[1] = htons(error);
2424 if (msg)
2425 {
2426 int m = strlen(msg);
2427 if (m + 4 > sizeof(buf))
2428 m = sizeof(buf) - 4;
2429
2430 memcpy(buf+2, msg, m);
2431 l += m;
2432 }
2433
2434 controlb(c, 1, (uint8_t *)buf, l, 1);
2435 }
2436 else
2437 control16(c, 1, result, 1);
2438
2439 control16(c, 9, t, 1); // assigned tunnel (our end)
2440 controladd(c, 0, t); // send the message
2441 }
2442 }
2443
2444 // read and process packet on tunnel (UDP)
2445 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2446 {
2447 uint8_t *sendchalresponse = NULL;
2448 uint8_t *recvchalresponse = NULL;
2449 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2450 uint8_t *p = buf + 2;
2451
2452
2453 CSTAT(processudp);
2454
2455 udp_rx += len;
2456 udp_rx_pkt++;
2457 LOG_HEX(5, "UDP Data", buf, len);
2458 STAT(tunnel_rx_packets);
2459 INC_STAT(tunnel_rx_bytes, len);
2460 if (len < 6)
2461 {
2462 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2463 STAT(tunnel_rx_errors);
2464 return;
2465 }
2466 if ((buf[1] & 0x0F) != 2)
2467 {
2468 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2469 STAT(tunnel_rx_errors);
2470 return;
2471 }
2472 if (*buf & 0x40)
2473 { // length
2474 l = ntohs(*(uint16_t *) p);
2475 p += 2;
2476 }
2477 t = ntohs(*(uint16_t *) p);
2478 p += 2;
2479 s = ntohs(*(uint16_t *) p);
2480 p += 2;
2481 if (s >= MAXSESSION)
2482 {
2483 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2484 STAT(tunnel_rx_errors);
2485 return;
2486 }
2487 if (t >= MAXTUNNEL)
2488 {
2489 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2490 STAT(tunnel_rx_errors);
2491 return;
2492 }
2493 if (t == TUNNEL_ID_PPPOE)
2494 {
2495 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2496 STAT(tunnel_rx_errors);
2497 return;
2498 }
2499 if (*buf & 0x08)
2500 { // ns/nr
2501 ns = ntohs(*(uint16_t *) p);
2502 p += 2;
2503 nr = ntohs(*(uint16_t *) p);
2504 p += 2;
2505 }
2506 if (*buf & 0x02)
2507 { // offset
2508 uint16_t o = ntohs(*(uint16_t *) p);
2509 p += o + 2;
2510 }
2511 if ((p - buf) > l)
2512 {
2513 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2514 STAT(tunnel_rx_errors);
2515 return;
2516 }
2517 l -= (p - buf);
2518
2519 // used to time out old tunnels
2520 if (t && tunnel[t].state == TUNNELOPEN)
2521 tunnel[t].lastrec = time_now;
2522
2523 if (*buf & 0x80)
2524 { // control
2525 uint16_t message = 0xFFFF; // message type
2526 uint8_t fatal = 0;
2527 uint8_t mandatory = 0;
2528 uint16_t asession = 0; // assigned session
2529 uint32_t amagic = 0; // magic number
2530 uint8_t aflags = 0; // flags from last LCF
2531 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2532 char called[MAXTEL] = ""; // called number
2533 char calling[MAXTEL] = ""; // calling number
2534
2535 if (!config->cluster_iam_master)
2536 {
2537 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2538 return;
2539 }
2540
2541 // control messages must have bits 0x80|0x40|0x08
2542 // (type, length and sequence) set, and bits 0x02|0x01
2543 // (offset and priority) clear
2544 if ((*buf & 0xCB) != 0xC8)
2545 {
2546 LOG(1, s, t, "Bad control header %02X\n", *buf);
2547 STAT(tunnel_rx_errors);
2548 return;
2549 }
2550
2551 // check for duplicate tunnel open message
2552 if (!t && ns == 0)
2553 {
2554 int i;
2555
2556 //
2557 // Is this a duplicate of the first packet? (SCCRQ)
2558 //
2559 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2560 {
2561 if (tunnel[i].state != TUNNELOPENING ||
2562 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2563 tunnel[i].port != ntohs(addr->sin_port) )
2564 continue;
2565 t = i;
2566 LOG(3, s, t, "Duplicate SCCRQ?\n");
2567 break;
2568 }
2569 }
2570
2571 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2572 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2573
2574 // if no tunnel specified, assign one
2575 if (!t)
2576 {
2577 if (!(t = new_tunnel()))
2578 {
2579 LOG(1, 0, 0, "No more tunnels\n");
2580 STAT(tunnel_overflow);
2581 return;
2582 }
2583 tunnelclear(t);
2584 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2585 tunnel[t].port = ntohs(addr->sin_port);
2586 tunnel[t].window = 4; // default window
2587 tunnel[t].indexudp = indexudpfd;
2588 STAT(tunnel_created);
2589 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2590 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2591 }
2592
2593 // If the 'ns' just received is not the 'nr' we're
2594 // expecting, just send an ack and drop it.
2595 //
2596 // if 'ns' is less, then we got a retransmitted packet.
2597 // if 'ns' is greater than missed a packet. Either way
2598 // we should ignore it.
2599 if (ns != tunnel[t].nr)
2600 {
2601 // is this the sequence we were expecting?
2602 STAT(tunnel_rx_errors);
2603 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2604 t, ns, tunnel[t].nr);
2605
2606 if (l) // Is this not a ZLB?
2607 controlnull(t);
2608 return;
2609 }
2610
2611 // check sequence of this message
2612 {
2613 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2614 // some to clear maybe?
2615 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2616 {
2617 controlt *c = tunnel[t].controls;
2618 tunnel[t].controls = c->next;
2619 tunnel[t].controlc--;
2620 c->next = controlfree;
2621 controlfree = c;
2622 skip--;
2623 tunnel[t].try = 0; // we have progress
2624 }
2625
2626 // receiver advance (do here so quoted correctly in any sends below)
2627 if (l) tunnel[t].nr = (ns + 1);
2628 if (skip < 0) skip = 0;
2629 if (skip < tunnel[t].controlc)
2630 {
2631 // some control packets can now be sent that were previous stuck out of window
2632 int tosend = tunnel[t].window - skip;
2633 controlt *c = tunnel[t].controls;
2634 while (c && skip)
2635 {
2636 c = c->next;
2637 skip--;
2638 }
2639 while (c && tosend)
2640 {
2641 tunnel[t].try = 0; // first send
2642 tunnelsend(c->buf, c->length, t);
2643 c = c->next;
2644 tosend--;
2645 }
2646 }
2647 if (!tunnel[t].controlc)
2648 tunnel[t].retry = 0; // caught up
2649 }
2650 if (l)
2651 { // if not a null message
2652 int result = 0;
2653 int error = 0;
2654 char *msg = 0;
2655
2656 // Default disconnect cause/message on receipt of CDN. Set to
2657 // more specific value from attribute 1 (result code) or 46
2658 // (disconnect cause) if present below.
2659 int disc_cause_set = 0;
2660 int disc_cause = TERM_NAS_REQUEST;
2661 char const *disc_reason = "Closed (Received CDN).";
2662
2663 // process AVPs
2664 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2665 {
2666 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2667 uint8_t *b = p;
2668 uint8_t flags = *p;
2669 uint16_t mtype;
2670
2671 if (n > l)
2672 {
2673 LOG(1, s, t, "Invalid length in AVP\n");
2674 STAT(tunnel_rx_errors);
2675 return;
2676 }
2677 p += n; // next
2678 l -= n;
2679 if (flags & 0x3C) // reserved bits, should be clear
2680 {
2681 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2682 fatal = flags;
2683 result = 2; // general error
2684 error = 3; // reserved field non-zero
2685 msg = 0;
2686 continue; // next
2687 }
2688 b += 2;
2689 if (*(uint16_t *) (b))
2690 {
2691 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2692 fatal = flags;
2693 result = 2; // general error
2694 error = 6; // generic vendor-specific error
2695 msg = "unsupported vendor-specific";
2696 continue; // next
2697 }
2698 b += 2;
2699 mtype = ntohs(*(uint16_t *) (b));
2700 b += 2;
2701 n -= 6;
2702
2703 if (flags & 0x40)
2704 {
2705 uint16_t orig_len;
2706
2707 // handle hidden AVPs
2708 if (!*config->l2tp_secret)
2709 {
2710 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2711 fatal = flags;
2712 result = 2; // general error
2713 error = 6; // generic vendor-specific error
2714 msg = "secret not specified";
2715 continue;
2716 }
2717 if (!session[s].random_vector_length)
2718 {
2719 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2720 fatal = flags;
2721 result = 2; // general error
2722 error = 6; // generic
2723 msg = "no random vector";
2724 continue;
2725 }
2726 if (n < 8)
2727 {
2728 LOG(2, s, t, "Short hidden AVP.\n");
2729 fatal = flags;
2730 result = 2; // general error
2731 error = 2; // length is wrong
2732 msg = 0;
2733 continue;
2734 }
2735
2736 // Unhide the AVP
2737 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2738
2739 orig_len = ntohs(*(uint16_t *) b);
2740 if (orig_len > n + 2)
2741 {
2742 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2743 orig_len, n);
2744
2745 fatal = flags;
2746 result = 2; // general error
2747 error = 2; // length is wrong
2748 msg = 0;
2749 continue;
2750 }
2751
2752 b += 2;
2753 n = orig_len;
2754 }
2755
2756 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2757 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2758
2759 switch (mtype)
2760 {
2761 case 0: // message type
2762 message = ntohs(*(uint16_t *) b);
2763 mandatory = flags & 0x80;
2764 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2765 break;
2766 case 1: // result code
2767 {
2768 uint16_t rescode = ntohs(*(uint16_t *) b);
2769 char const *resdesc = "(unknown)";
2770 char const *errdesc = NULL;
2771 int cause = 0;
2772
2773 if (message == 4)
2774 { /* StopCCN */
2775 resdesc = l2tp_stopccn_result_code(rescode);
2776 cause = TERM_LOST_SERVICE;
2777 }
2778 else if (message == 14)
2779 { /* CDN */
2780 resdesc = l2tp_cdn_result_code(rescode);
2781 if (rescode == 1)
2782 cause = TERM_LOST_CARRIER;
2783 else
2784 cause = TERM_ADMIN_RESET;
2785 }
2786
2787 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2788 if (n >= 4)
2789 {
2790 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2791 errdesc = l2tp_error_code(errcode);
2792 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2793 }
2794 if (n > 4)
2795 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2796
2797 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2798 {
2799 disc_cause_set = mtype;
2800 disc_reason = errdesc ? errdesc : resdesc;
2801 disc_cause = cause;
2802 }
2803
2804 break;
2805 }
2806 break;
2807 case 2: // protocol version
2808 {
2809 version = ntohs(*(uint16_t *) (b));
2810 LOG(4, s, t, " Protocol version = %u\n", version);
2811 if (version && version != 0x0100)
2812 { // allow 0.0 and 1.0
2813 LOG(1, s, t, " Bad protocol version %04X\n", version);
2814 fatal = flags;
2815 result = 5; // unspported protocol version
2816 error = 0x0100; // supported version
2817 msg = 0;
2818 continue; // next
2819 }
2820 }
2821 break;
2822 case 3: // framing capabilities
2823 break;
2824 case 4: // bearer capabilities
2825 break;
2826 case 5: // tie breaker
2827 // We never open tunnels, so we don't care about tie breakers
2828 continue;
2829 case 6: // firmware revision
2830 break;
2831 case 7: // host name
2832 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2833 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2834 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2835 // TBA - to send to RADIUS
2836 break;
2837 case 8: // vendor name
2838 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2839 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2840 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2841 break;
2842 case 9: // assigned tunnel
2843 tunnel[t].far = ntohs(*(uint16_t *) (b));
2844 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2845 break;
2846 case 10: // rx window
2847 tunnel[t].window = ntohs(*(uint16_t *) (b));
2848 if (!tunnel[t].window)
2849 tunnel[t].window = 1; // window of 0 is silly
2850 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2851 break;
2852 case 11: // Request Challenge
2853 {
2854 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2855 if (message == 1)
2856 build_chap_response(b, 2, n, &sendchalresponse);
2857 else if (message == 2)
2858 build_chap_response(b, 3, n, &sendchalresponse);
2859 }
2860 break;
2861 case 13: // receive challenge Response
2862 if (tunnel[t].isremotelns)
2863 {
2864 recvchalresponse = calloc(17, 1);
2865 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2866 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2867 }
2868 else
2869 // Why did they send a response? We never challenge.
2870 LOG(2, s, t, " received unexpected challenge response\n");
2871 break;
2872
2873 case 14: // assigned session
2874 asession = session[s].far = ntohs(*(uint16_t *) (b));
2875 LOG(4, s, t, " assigned session = %u\n", asession);
2876 break;
2877 case 15: // call serial number
2878 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2879 break;
2880 case 18: // bearer type
2881 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2882 // TBA - for RADIUS
2883 break;
2884 case 19: // framing type
2885 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2886 // TBA
2887 break;
2888 case 21: // called number
2889 memset(called, 0, sizeof(called));
2890 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2891 LOG(4, s, t, " Called <%s>\n", called);
2892 break;
2893 case 22: // calling number
2894 memset(calling, 0, sizeof(calling));
2895 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2896 LOG(4, s, t, " Calling <%s>\n", calling);
2897 break;
2898 case 23: // subtype
2899 break;
2900 case 24: // tx connect speed
2901 if (n == 4)
2902 {
2903 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2904 }
2905 else
2906 {
2907 // AS5300s send connect speed as a string
2908 char tmp[30];
2909 memset(tmp, 0, sizeof(tmp));
2910 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2911 session[s].tx_connect_speed = atol(tmp);
2912 }
2913 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2914 break;
2915 case 38: // rx connect speed
2916 if (n == 4)
2917 {
2918 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2919 }
2920 else
2921 {
2922 // AS5300s send connect speed as a string
2923 char tmp[30];
2924 memset(tmp, 0, sizeof(tmp));
2925 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2926 session[s].rx_connect_speed = atol(tmp);
2927 }
2928 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2929 break;
2930 case 25: // Physical Channel ID
2931 {
2932 uint32_t tmp = ntohl(*(uint32_t *) b);
2933 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2934 break;
2935 }
2936 case 29: // Proxy Authentication Type
2937 {
2938 uint16_t atype = ntohs(*(uint16_t *)b);
2939 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2940 break;
2941 }
2942 case 30: // Proxy Authentication Name
2943 {
2944 char authname[64];
2945 memset(authname, 0, sizeof(authname));
2946 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2947 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2948 authname);
2949 break;
2950 }
2951 case 31: // Proxy Authentication Challenge
2952 {
2953 LOG(4, s, t, " Proxy Auth Challenge\n");
2954 break;
2955 }
2956 case 32: // Proxy Authentication ID
2957 {
2958 uint16_t authid = ntohs(*(uint16_t *)(b));
2959 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2960 break;
2961 }
2962 case 33: // Proxy Authentication Response
2963 LOG(4, s, t, " Proxy Auth Response\n");
2964 break;
2965 case 27: // last sent lcp
2966 { // find magic number
2967 uint8_t *p = b, *e = p + n;
2968 while (p + 1 < e && p[1] && p + p[1] <= e)
2969 {
2970 if (*p == 5 && p[1] == 6) // Magic-Number
2971 amagic = ntohl(*(uint32_t *) (p + 2));
2972 else if (*p == 7) // Protocol-Field-Compression
2973 aflags |= SESSION_PFC;
2974 else if (*p == 8) // Address-and-Control-Field-Compression
2975 aflags |= SESSION_ACFC;
2976 p += p[1];
2977 }
2978 }
2979 break;
2980 case 28: // last recv lcp confreq
2981 break;
2982 case 26: // Initial Received LCP CONFREQ
2983 break;
2984 case 39: // seq required - we control it as an LNS anyway...
2985 break;
2986 case 36: // Random Vector
2987 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2988 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2989 if (n > sizeof(session[s].random_vector))
2990 n = sizeof(session[s].random_vector);
2991 memcpy(session[s].random_vector, b, n);
2992 session[s].random_vector_length = n;
2993 break;
2994 case 46: // ppp disconnect cause
2995 if (n >= 5)
2996 {
2997 uint16_t code = ntohs(*(uint16_t *) b);
2998 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2999 uint8_t dir = *(b + 4);
3000
3001 LOG(4, s, t, " PPP disconnect cause "
3002 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3003 code, proto, dir, n - 5, b + 5);
3004
3005 disc_cause_set = mtype;
3006
3007 switch (code)
3008 {
3009 case 1: // admin disconnect
3010 disc_cause = TERM_ADMIN_RESET;
3011 disc_reason = "Administrative disconnect";
3012 break;
3013 case 3: // lcp terminate
3014 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
3015 disc_cause = TERM_USER_REQUEST;
3016 disc_reason = "Normal disconnection";
3017 break;
3018 case 4: // compulsory encryption unavailable
3019 if (dir != 1) break; // 1=refused by peer, 2=local
3020 disc_cause = TERM_USER_ERROR;
3021 disc_reason = "Compulsory encryption refused";
3022 break;
3023 case 5: // lcp: fsm timeout
3024 disc_cause = TERM_PORT_ERROR;
3025 disc_reason = "LCP: FSM timeout";
3026 break;
3027 case 6: // lcp: no recognisable lcp packets received
3028 disc_cause = TERM_PORT_ERROR;
3029 disc_reason = "LCP: no recognisable LCP packets";
3030 break;
3031 case 7: // lcp: magic-no error (possibly looped back)
3032 disc_cause = TERM_PORT_ERROR;
3033 disc_reason = "LCP: magic-no error (possible loop)";
3034 break;
3035 case 8: // lcp: echo request timeout
3036 disc_cause = TERM_PORT_ERROR;
3037 disc_reason = "LCP: echo request timeout";
3038 break;
3039 case 13: // auth: fsm timeout
3040 disc_cause = TERM_SERVICE_UNAVAILABLE;
3041 disc_reason = "Authentication: FSM timeout";
3042 break;
3043 case 15: // auth: unacceptable auth protocol
3044 disc_cause = TERM_SERVICE_UNAVAILABLE;
3045 disc_reason = "Unacceptable authentication protocol";
3046 break;
3047 case 16: // auth: authentication failed
3048 disc_cause = TERM_SERVICE_UNAVAILABLE;
3049 disc_reason = "Authentication failed";
3050 break;
3051 case 17: // ncp: fsm timeout
3052 disc_cause = TERM_SERVICE_UNAVAILABLE;
3053 disc_reason = "NCP: FSM timeout";
3054 break;
3055 case 18: // ncp: no ncps available
3056 disc_cause = TERM_SERVICE_UNAVAILABLE;
3057 disc_reason = "NCP: no NCPs available";
3058 break;
3059 case 19: // ncp: failure to converge on acceptable address
3060 disc_cause = TERM_SERVICE_UNAVAILABLE;
3061 disc_reason = (dir == 1)
3062 ? "NCP: too many Configure-Naks received from peer"
3063 : "NCP: too many Configure-Naks sent to peer";
3064 break;
3065 case 20: // ncp: user not permitted to use any address
3066 disc_cause = TERM_SERVICE_UNAVAILABLE;
3067 disc_reason = (dir == 1)
3068 ? "NCP: local link address not acceptable to peer"
3069 : "NCP: remote link address not acceptable";
3070 break;
3071 }
3072 }
3073 break;
3074 default:
3075 {
3076 static char e[] = "unknown AVP 0xXXXX";
3077 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3078 fatal = flags;
3079 result = 2; // general error
3080 error = 8; // unknown mandatory AVP
3081 sprintf((msg = e) + 14, "%04x", mtype);
3082 continue; // next
3083 }
3084 }
3085 }
3086 // process message
3087 if (fatal & 0x80)
3088 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3089 else
3090 switch (message)
3091 {
3092 case 1: // SCCRQ - Start Control Connection Request
3093 tunnel[t].state = TUNNELOPENING;
3094 LOG(3, s, t, "Received SCCRQ\n");
3095 if (main_quit != QUIT_SHUTDOWN)
3096 {
3097 LOG(3, s, t, "sending SCCRP\n");
3098 controlt *c = controlnew(2); // sending SCCRP
3099 control16(c, 2, version, 1); // protocol version
3100 control32(c, 3, 3, 1); // framing
3101 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3102 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3103 control16(c, 9, t, 1); // assigned tunnel
3104 controladd(c, 0, t); // send the resply
3105 }
3106 else
3107 {
3108 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3109 }
3110 break;
3111 case 2: // SCCRP
3112 tunnel[t].state = TUNNELOPEN;
3113 tunnel[t].lastrec = time_now;
3114 LOG(3, s, t, "Received SCCRP\n");
3115 if (main_quit != QUIT_SHUTDOWN)
3116 {
3117 if (tunnel[t].isremotelns && recvchalresponse)
3118 {
3119 hasht hash;
3120
3121 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3122 // check authenticator
3123 if (memcmp(hash, recvchalresponse, 16) == 0)
3124 {
3125 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3126 controlt *c = controlnew(3); // sending SCCCN
3127 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3128 controls(c, 8, Vendor_name, 1); // Vendor name
3129 control16(c, 2, version, 1); // protocol version
3130 control32(c, 3, 3, 1); // framing Capabilities
3131 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3132 control16(c, 9, t, 1); // assigned tunnel
3133 controladd(c, 0, t); // send
3134 }
3135 else
3136 {
3137 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3138 }
3139 }
3140 }
3141 else
3142 {
3143 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3144 }
3145 break;
3146 case 3: // SCCN
3147 LOG(3, s, t, "Received SCCN\n");
3148 tunnel[t].state = TUNNELOPEN;
3149 tunnel[t].lastrec = time_now;
3150 controlnull(t); // ack
3151 break;
3152 case 4: // StopCCN
3153 LOG(3, s, t, "Received StopCCN\n");
3154 controlnull(t); // ack
3155 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3156 break;
3157 case 6: // HELLO
3158 LOG(3, s, t, "Received HELLO\n");
3159 controlnull(t); // simply ACK
3160 break;
3161 case 7: // OCRQ
3162 // TBA
3163 LOG(3, s, t, "Received OCRQ\n");
3164 break;
3165 case 8: // OCRO
3166 // TBA
3167 LOG(3, s, t, "Received OCRO\n");
3168 break;
3169 case 9: // OCCN
3170 // TBA
3171 LOG(3, s, t, "Received OCCN\n");
3172 break;
3173 case 10: // ICRQ
3174 LOG(3, s, t, "Received ICRQ\n");
3175 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3176 {
3177 controlt *c = controlnew(11); // ICRP
3178
3179 LOG(3, s, t, "Sending ICRP\n");
3180
3181 s = sessionfree;
3182 sessionfree = session[s].next;
3183 memset(&session[s], 0, sizeof(session[s]));
3184
3185 if (s > config->cluster_highest_sessionid)
3186 config->cluster_highest_sessionid = s;
3187
3188 session[s].opened = time_now;
3189 session[s].tunnel = t;
3190 session[s].far = asession;
3191 session[s].last_packet = session[s].last_data = time_now;
3192 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3193 control16(c, 14, s, 1); // assigned session
3194 controladd(c, asession, t); // send the reply
3195
3196 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3197 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3198
3199 session[s].ppp.phase = Establish;
3200 session[s].ppp.lcp = Starting;
3201
3202 STAT(session_created);
3203 break;
3204 }
3205
3206 {
3207 controlt *c = controlnew(14); // CDN
3208 LOG(3, s, t, "Sending CDN\n");
3209 if (!sessionfree)
3210 {
3211 STAT(session_overflow);
3212 LOG(1, 0, t, "No free sessions\n");
3213 control16(c, 1, 4, 0); // temporary lack of resources
3214 }
3215 else
3216 control16(c, 1, 2, 7); // shutting down, try another
3217
3218 controladd(c, asession, t); // send the message
3219 }
3220 return;
3221 case 11: // ICRP
3222 LOG(3, s, t, "Received ICRP\n");
3223 if (session[s].forwardtosession)
3224 {
3225 controlt *c = controlnew(12); // ICCN
3226
3227 session[s].opened = time_now;
3228 session[s].tunnel = t;
3229 session[s].far = asession;
3230 session[s].last_packet = session[s].last_data = time_now;
3231
3232 control32(c, 19, 1, 1); // Framing Type
3233 control32(c, 24, 10000000, 1); // Tx Connect Speed
3234 controladd(c, asession, t); // send the message
3235 LOG(3, s, t, "Sending ICCN\n");
3236 }
3237 break;
3238 case 12: // ICCN
3239 LOG(3, s, t, "Received ICCN\n");
3240 if (amagic == 0) amagic = time_now;
3241 session[s].magic = amagic; // set magic number
3242 session[s].flags = aflags; // set flags received
3243 session[s].mru = PPPoE_MRU; // default
3244 controlnull(t); // ack
3245
3246 // start LCP
3247 sess_local[s].lcp_authtype = config->radius_authprefer;
3248 sess_local[s].ppp_mru = MRU;
3249
3250 // Set multilink options before sending initial LCP packet
3251 sess_local[s].mp_mrru = 1614;
3252 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3253
3254 sendlcp(s, t);
3255 change_state(s, lcp, RequestSent);
3256 break;
3257
3258 case 14: // CDN
3259 LOG(3, s, t, "Received CDN\n");
3260 controlnull(t); // ack
3261 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3262 break;
3263 case 0xFFFF:
3264 LOG(1, s, t, "Missing message type\n");
3265 break;
3266 default:
3267 STAT(tunnel_rx_errors);
3268 if (mandatory)
3269 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3270 else
3271 LOG(1, s, t, "Unknown message type %u\n", message);
3272 break;
3273 }
3274 if (sendchalresponse) free(sendchalresponse);
3275 if (recvchalresponse) free(recvchalresponse);
3276 cluster_send_tunnel(t);
3277 }
3278 else
3279 {
3280 LOG(4, s, t, " Got a ZLB ack\n");
3281 }
3282 }
3283 else
3284 { // data
3285 uint16_t proto;
3286
3287 LOG_HEX(5, "Receive Tunnel Data", p, l);
3288 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3289 { // HDLC address header, discard
3290 p += 2;
3291 l -= 2;
3292 }
3293 if (l < 2)
3294 {
3295 LOG(1, s, t, "Short ppp length %d\n", l);
3296 STAT(tunnel_rx_errors);
3297 return;
3298 }
3299 if (*p & 1)
3300 {
3301 proto = *p++;
3302 l--;
3303 }
3304 else
3305 {
3306 proto = ntohs(*(uint16_t *) p);
3307 p += 2;
3308 l -= 2;
3309 }
3310
3311 if (session[s].forwardtosession)
3312 {
3313 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3314 // Forward to LAC/BAS or Remote LNS session
3315 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3316 return;
3317 }
3318 else if (config->auth_tunnel_change_addr_src)
3319 {
3320 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3321 tunnel[t].port == ntohs(addr->sin_port))
3322 {
3323 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3324 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3325 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3326
3327 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3328 }
3329 }
3330
3331 if (s && !session[s].opened) // Is something wrong??
3332 {
3333 if (!config->cluster_iam_master)
3334 {
3335 // Pass it off to the master to deal with..
3336 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3337 return;
3338 }
3339
3340 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3341 STAT(tunnel_rx_errors);
3342 return;
3343 }
3344
3345 if (proto == PPPPAP)
3346 {
3347 session[s].last_packet = time_now;
3348 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3349 processpap(s, t, p, l);
3350 }
3351 else if (proto == PPPCHAP)
3352 {
3353 session[s].last_packet = time_now;
3354 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3355 processchap(s, t, p, l);
3356 }
3357 else if (proto == PPPLCP)
3358 {
3359 session[s].last_packet = time_now;
3360 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3361 processlcp(s, t, p, l);
3362 }
3363 else if (proto == PPPIPCP)
3364 {
3365 session[s].last_packet = time_now;
3366 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3367 processipcp(s, t, p, l);
3368 }
3369 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3370 {
3371 session[s].last_packet = time_now;
3372 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3373 processipv6cp(s, t, p, l);
3374 }
3375 else if (proto == PPPCCP)
3376 {
3377 session[s].last_packet = time_now;
3378 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3379 processccp(s, t, p, l);
3380 }
3381 else if (proto == PPPIP)
3382 {
3383 if (session[s].die)
3384 {
3385 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3386 return; // closing session, PPP not processed
3387 }
3388
3389 session[s].last_packet = session[s].last_data = time_now;
3390 if (session[s].walled_garden && !config->cluster_iam_master)
3391 {
3392 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3393 return;
3394 }
3395
3396 processipin(s, t, p, l);
3397 }
3398 else if (proto == PPPMP)
3399 {
3400 if (session[s].die)
3401 {
3402 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3403 return; // closing session, PPP not processed
3404 }
3405
3406 session[s].last_packet = session[s].last_data = time_now;
3407 if (!config->cluster_iam_master)
3408 {
3409 // The fragments reconstruction is managed by the Master.
3410 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3411 return;
3412 }
3413
3414 processmpin(s, t, p, l);
3415 }
3416 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3417 {
3418 if (session[s].die)
3419 {
3420 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3421 return; // closing session, PPP not processed
3422 }
3423
3424 session[s].last_packet = session[s].last_data = time_now;
3425 if (session[s].walled_garden && !config->cluster_iam_master)
3426 {
3427 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3428 return;
3429 }
3430
3431 processipv6in(s, t, p, l);
3432 }
3433 else if (session[s].ppp.lcp == Opened)
3434 {
3435 session[s].last_packet = time_now;
3436 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3437 protoreject(s, t, p, l, proto);
3438 }
3439 else
3440 {
3441 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3442 proto, ppp_state(session[s].ppp.lcp));
3443 }
3444 }
3445 }
3446
3447 // read and process packet on tun
3448 // (i.e. this routine writes to buf[-8]).
3449 static void processtun(uint8_t * buf, int len)
3450 {
3451 LOG_HEX(5, "Receive TUN Data", buf, len);
3452 STAT(tun_rx_packets);
3453 INC_STAT(tun_rx_bytes, len);
3454
3455 CSTAT(processtun);
3456
3457 eth_rx_pkt++;
3458 eth_rx += len;
3459 if (len < 22)
3460 {
3461 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3462 STAT(tun_rx_errors);
3463 return;
3464 }
3465
3466 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3467 processipout(buf, len);
3468 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3469 && config->ipv6_prefix.s6_addr[0])
3470 processipv6out(buf, len);
3471
3472 // Else discard.
3473 }
3474
3475 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3476 // that we look at the whole of the tunnel, radius and session tables
3477 // every second
3478 static void regular_cleanups(double period)
3479 {
3480 // Next tunnel, radius and session to check for actions on.
3481 static tunnelidt t = 0;
3482 static int r = 0;
3483 static sessionidt s = 0;
3484
3485 int t_actions = 0;
3486 int r_actions = 0;
3487 int s_actions = 0;
3488
3489 int t_slice;
3490 int r_slice;
3491 int s_slice;
3492
3493 int i;
3494 int a;
3495
3496 // divide up tables into slices based on the last run
3497 t_slice = config->cluster_highest_tunnelid * period;
3498 r_slice = (MAXRADIUS - 1) * period;
3499 s_slice = config->cluster_highest_sessionid * period;
3500
3501 if (t_slice < 1)
3502 t_slice = 1;
3503 else if (t_slice > config->cluster_highest_tunnelid)
3504 t_slice = config->cluster_highest_tunnelid;
3505
3506 if (r_slice < 1)
3507 r_slice = 1;
3508 else if (r_slice > (MAXRADIUS - 1))
3509 r_slice = MAXRADIUS - 1;
3510
3511 if (s_slice < 1)
3512 s_slice = 1;
3513 else if (s_slice > config->cluster_highest_sessionid)
3514 s_slice = config->cluster_highest_sessionid;
3515
3516 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3517
3518 for (i = 0; i < t_slice; i++)
3519 {
3520 t++;
3521 if (t > config->cluster_highest_tunnelid)
3522 t = 1;
3523
3524 if (t == TUNNEL_ID_PPPOE)
3525 continue;
3526
3527 // check for expired tunnels
3528 if (tunnel[t].die && tunnel[t].die <= TIME)
3529 {
3530 STAT(tunnel_timeout);
3531 tunnelkill(t, "Expired");
3532 t_actions++;
3533 continue;
3534 }
3535 // check for message resend
3536 if (tunnel[t].retry && tunnel[t].controlc)
3537 {
3538 // resend pending messages as timeout on reply
3539 if (tunnel[t].retry <= TIME)
3540 {
3541 controlt *c = tunnel[t].controls;
3542 uint16_t w = tunnel[t].window;
3543 tunnel[t].try++; // another try
3544 if (tunnel[t].try > 5)
3545 tunnelkill(t, "Timeout on control message"); // game over
3546 else
3547 while (c && w--)
3548 {
3549 tunnelsend(c->buf, c->length, t);
3550 c = c->next;
3551 }
3552
3553 t_actions++;
3554 }
3555 }
3556 // Send hello
3557 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3558 {
3559 if (!config->disable_sending_hello)
3560 {
3561 controlt *c = controlnew(6); // sending HELLO
3562 controladd(c, 0, t); // send the message
3563 LOG(3, 0, t, "Sending HELLO message\n");
3564 t_actions++;
3565 }
3566 }
3567
3568 // Check for tunnel changes requested from the CLI
3569 if ((a = cli_tunnel_actions[t].action))
3570 {
3571 cli_tunnel_actions[t].action = 0;
3572 if (a & CLI_TUN_KILL)
3573 {
3574 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3575 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3576 t_actions++;
3577 }
3578 }
3579 }
3580
3581 for (i = 0; i < r_slice; i++)
3582 {
3583 r++;
3584 if (r >= MAXRADIUS)
3585 r = 1;
3586
3587 if (!radius[r].state)
3588 continue;
3589
3590 if (radius[r].retry <= TIME)
3591 {
3592 radiusretry(r);
3593 r_actions++;
3594 }
3595 }
3596
3597 for (i = 0; i < s_slice; i++)
3598 {
3599 s++;
3600 if (s > config->cluster_highest_sessionid)
3601 s = 1;
3602
3603 if (!session[s].opened) // Session isn't in use
3604 continue;
3605
3606 // check for expired sessions
3607 if (session[s].die)
3608 {
3609 if (session[s].die <= TIME)
3610 {
3611 sessionkill(s, "Expired");
3612 s_actions++;
3613 }
3614 continue;
3615 }
3616
3617 // PPP timeouts
3618 if (sess_local[s].lcp.restart <= time_now)
3619 {
3620 int next_state = session[s].ppp.lcp;
3621 switch (session[s].ppp.lcp)
3622 {
3623 case RequestSent:
3624 case AckReceived:
3625 next_state = RequestSent;
3626
3627 case AckSent:
3628 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3629 {
3630 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3631 sendlcp(s, session[s].tunnel);
3632 change_state(s, lcp, next_state);
3633 }
3634 else
3635 {
3636 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3637 STAT(session_timeout);
3638 }
3639
3640 s_actions++;
3641 }
3642
3643 if (session[s].die)
3644 continue;
3645 }
3646
3647 if (sess_local[s].ipcp.restart <= time_now)
3648 {
3649 int next_state = session[s].ppp.ipcp;
3650 switch (session[s].ppp.ipcp)
3651 {
3652 case RequestSent:
3653 case AckReceived:
3654 next_state = RequestSent;
3655
3656 case AckSent:
3657 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3658 {
3659 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3660 sendipcp(s, session[s].tunnel);
3661 change_state(s, ipcp, next_state);
3662 }
3663 else
3664 {
3665 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3666 STAT(session_timeout);
3667 }
3668
3669 s_actions++;
3670 }
3671
3672 if (session[s].die)
3673 continue;
3674 }
3675
3676 if (sess_local[s].ipv6cp.restart <= time_now)
3677 {
3678 int next_state = session[s].ppp.ipv6cp;
3679 switch (session[s].ppp.ipv6cp)
3680 {
3681 case RequestSent:
3682 case AckReceived:
3683 next_state = RequestSent;
3684
3685 case AckSent:
3686 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3687 {
3688 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3689 sendipv6cp(s, session[s].tunnel);
3690 change_state(s, ipv6cp, next_state);
3691 }
3692 else
3693 {
3694 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3695 change_state(s, ipv6cp, Stopped);
3696 }
3697
3698 s_actions++;
3699 }
3700 }
3701
3702 if (sess_local[s].ccp.restart <= time_now)
3703 {
3704 int next_state = session[s].ppp.ccp;
3705 switch (session[s].ppp.ccp)
3706 {
3707 case RequestSent:
3708 case AckReceived:
3709 next_state = RequestSent;
3710
3711 case AckSent:
3712 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3713 {
3714 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3715 sendccp(s, session[s].tunnel);
3716 change_state(s, ccp, next_state);
3717 }
3718 else
3719 {
3720 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3721 change_state(s, ccp, Stopped);
3722 }
3723
3724 s_actions++;
3725 }
3726 }
3727
3728 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3729 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3730 {
3731 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3732 STAT(session_timeout);
3733 s_actions++;
3734 continue;
3735 }
3736
3737 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3738 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3739 (time_now - sess_local[s].last_echo >= config->echo_timeout))
3740 {
3741 uint8_t b[MAXETHER];
3742
3743 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3744 if (!q) continue;
3745
3746 *q = EchoReq;
3747 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3748 *(uint16_t *)(q + 2) = htons(8); // Length
3749 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3750
3751 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3752 (int)(time_now - session[s].last_packet));
3753
3754 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3755 sess_local[s].last_echo = time_now;
3756 s_actions++;
3757 }
3758
3759 // Drop sessions who have reached session_timeout seconds
3760 if (session[s].session_timeout)
3761 {
3762 bundleidt bid = session[s].bundle;
3763 if (bid)
3764 {
3765 if (time_now - bundle[bid].last_check >= 1)
3766 {
3767 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3768 bundle[bid].last_check = time_now;
3769 if (bundle[bid].online_time >= session[s].session_timeout)
3770 {
3771 int ses;
3772 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3773 {
3774 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3775 s_actions++;
3776 continue;
3777 }
3778 }
3779 }
3780 }
3781 else if (time_now - session[s].opened >= session[s].session_timeout)
3782 {
3783 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3784 s_actions++;
3785 continue;
3786 }
3787 }
3788
3789 // Drop sessions who have reached idle_timeout seconds
3790 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3791 {
3792 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3793 STAT(session_timeout);
3794 s_actions++;
3795 continue;
3796 }
3797
3798 // Check for actions requested from the CLI
3799 if ((a = cli_session_actions[s].action))
3800 {
3801 int send = 0;
3802
3803 cli_session_actions[s].action = 0;
3804 if (a & CLI_SESS_KILL)
3805 {
3806 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3807 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3808 a = 0; // dead, no need to check for other actions
3809 s_actions++;
3810 }
3811
3812 if (a & CLI_SESS_NOSNOOP)
3813 {
3814 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3815 session[s].snoop_ip = 0;
3816 session[s].snoop_port = 0;
3817 s_actions++;
3818 send++;
3819 }
3820 else if (a & CLI_SESS_SNOOP)
3821 {
3822 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3823 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3824 cli_session_actions[s].snoop_port);
3825
3826 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3827 session[s].snoop_port = cli_session_actions[s].snoop_port;
3828 s_actions++;
3829 send++;
3830 }
3831
3832 if (a & CLI_SESS_NOTHROTTLE)
3833 {
3834 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3835 throttle_session(s, 0, 0);
3836 s_actions++;
3837 send++;
3838 }
3839 else if (a & CLI_SESS_THROTTLE)
3840 {
3841 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3842 cli_session_actions[s].throttle_in,
3843 cli_session_actions[s].throttle_out);
3844
3845 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3846 s_actions++;
3847 send++;
3848 }
3849
3850 if (a & CLI_SESS_NOFILTER)
3851 {
3852 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3853 filter_session(s, 0, 0);
3854 s_actions++;
3855 send++;
3856 }
3857 else if (a & CLI_SESS_FILTER)
3858 {
3859 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3860 cli_session_actions[s].filter_in,
3861 cli_session_actions[s].filter_out);
3862
3863 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3864 s_actions++;
3865 send++;
3866 }
3867
3868 if (send)
3869 cluster_send_session(s);
3870 }
3871
3872 // RADIUS interim accounting
3873 if (config->radius_accounting && config->radius_interim > 0
3874 && session[s].ip && !session[s].walled_garden
3875 && !sess_local[s].radius // RADIUS already in progress
3876 && time_now - sess_local[s].last_interim >= config->radius_interim
3877 && session[s].flags & SESSION_STARTED)
3878 {
3879 int rad = radiusnew(s);
3880 if (!rad)
3881 {
3882 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3883 STAT(radius_overflow);
3884 continue;
3885 }
3886
3887 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3888 session[s].user, session[s].unique_id);
3889
3890 radiussend(rad, RADIUSINTERIM);
3891 sess_local[s].last_interim = time_now;
3892 s_actions++;
3893 }
3894 }
3895
3896 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3897 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3898 }
3899
3900 //
3901 // Are we in the middle of a tunnel update, or radius
3902 // requests??
3903 //
3904 static int still_busy(void)
3905 {
3906 int i;
3907 static clockt last_talked = 0;
3908 static clockt start_busy_wait = 0;
3909
3910 #ifdef BGP
3911 static time_t stopped_bgp = 0;
3912 if (bgp_configured)
3913 {
3914 if (!stopped_bgp)
3915 {
3916 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3917
3918 for (i = 0; i < BGP_NUM_PEERS; i++)
3919 if (bgp_peers[i].state == Established)
3920 bgp_stop(&bgp_peers[i]);
3921
3922 stopped_bgp = time_now;
3923
3924 if (!config->cluster_iam_master)
3925 {
3926 // we don't want to become master
3927 cluster_send_ping(0);
3928
3929 return 1;
3930 }
3931 }
3932
3933 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3934 return 1;
3935 }
3936 #endif /* BGP */
3937
3938 if (!config->cluster_iam_master)
3939 return 0;
3940
3941 if (main_quit == QUIT_SHUTDOWN)
3942 {
3943 static int dropped = 0;
3944 if (!dropped)
3945 {
3946 int i;
3947
3948 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3949 for (i = 1; i < MAXTUNNEL; i++)
3950 if (tunnel[i].ip || tunnel[i].state)
3951 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3952
3953 dropped = 1;
3954 }
3955 }
3956
3957 if (start_busy_wait == 0)
3958 start_busy_wait = TIME;
3959
3960 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3961 {
3962 if (!tunnel[i].controlc)
3963 continue;
3964
3965 if (last_talked != TIME)
3966 {
3967 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3968 last_talked = TIME;
3969 }
3970 return 1;
3971 }
3972
3973 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3974 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3975 {
3976 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3977 return 0;
3978 }
3979
3980 for (i = 1; i < MAXRADIUS; i++)
3981 {
3982 if (radius[i].state == RADIUSNULL)
3983 continue;
3984 if (radius[i].state == RADIUSWAIT)
3985 continue;
3986
3987 if (last_talked != TIME)
3988 {
3989 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3990 last_talked = TIME;
3991 }
3992 return 1;
3993 }
3994
3995 return 0;
3996 }
3997
3998 #ifdef HAVE_EPOLL
3999 # include <sys/epoll.h>
4000 #else
4001 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4002 # include "fake_epoll.h"
4003 #endif
4004
4005 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4006 #define BASE_FDS (9 + MAX_UDPFD)
4007
4008 // additional polled fds
4009 #ifdef BGP
4010 # define EXTRA_FDS BGP_NUM_PEERS
4011 #else
4012 # define EXTRA_FDS 0
4013 #endif
4014
4015 // main loop - gets packets on tun or udp and processes them
4016 static void mainloop(void)
4017 {
4018 int i, j;
4019 uint8_t buf[65536];
4020 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4021 // and the forwarded pppoe session
4022 int size_bufp = sizeof(buf) - 32;
4023 clockt next_cluster_ping = 0; // send initial ping immediately
4024 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4025 int maxevent = sizeof(events)/sizeof(*events);
4026
4027 if ((epollfd = epoll_create(maxevent)) < 0)
4028 {
4029 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4030 exit(1);
4031 }
4032
4033 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",
4034 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4035
4036 /* setup our fds to poll for input */
4037 {
4038 static struct event_data d[BASE_FDS];
4039 struct epoll_event e;
4040
4041 e.events = EPOLLIN;
4042 i = 0;
4043
4044 if (clifd >= 0)
4045 {
4046 d[i].type = FD_TYPE_CLI;
4047 e.data.ptr = &d[i++];
4048 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4049 }
4050
4051 d[i].type = FD_TYPE_CLUSTER;
4052 e.data.ptr = &d[i++];
4053 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4054
4055 d[i].type = FD_TYPE_TUN;
4056 e.data.ptr = &d[i++];
4057 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4058
4059 d[i].type = FD_TYPE_CONTROL;
4060 e.data.ptr = &d[i++];
4061 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4062
4063 d[i].type = FD_TYPE_DAE;
4064 e.data.ptr = &d[i++];
4065 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4066
4067 d[i].type = FD_TYPE_NETLINK;
4068 e.data.ptr = &d[i++];
4069 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4070
4071 d[i].type = FD_TYPE_PPPOEDISC;
4072 e.data.ptr = &d[i++];
4073 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4074
4075 d[i].type = FD_TYPE_PPPOESESS;
4076 e.data.ptr = &d[i++];
4077 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4078
4079 for (j = 0; j < config->nbudpfd; j++)
4080 {
4081 d[i].type = FD_TYPE_UDP;
4082 d[i].index = j;
4083 e.data.ptr = &d[i++];
4084 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4085 }
4086 }
4087
4088 #ifdef BGP
4089 signal(SIGPIPE, SIG_IGN);
4090 bgp_setup(config->as_number);
4091 if (config->bind_address)
4092 bgp_add_route(config->bind_address, 0xffffffff);
4093
4094 for (i = 0; i < BGP_NUM_PEERS; i++)
4095 {
4096 if (config->neighbour[i].name[0])
4097 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4098 config->neighbour[i].as, config->neighbour[i].keepalive,
4099 config->neighbour[i].hold, config->neighbour[i].update_source,
4100 0); /* 0 = routing disabled */
4101 }
4102 #endif /* BGP */
4103
4104 while (!main_quit || still_busy())
4105 {
4106 int more = 0;
4107 int n;
4108
4109
4110 if (main_reload)
4111 {
4112 main_reload = 0;
4113 read_config_file();
4114 config->reload_config++;
4115 }
4116
4117 if (config->reload_config)
4118 {
4119 config->reload_config = 0;
4120 update_config();
4121 }
4122
4123 #ifdef BGP
4124 bgp_set_poll();
4125 #endif /* BGP */
4126
4127 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4128 STAT(select_called);
4129
4130 TIME = now(NULL);
4131 if (n < 0)
4132 {
4133 if (errno == EINTR ||
4134 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4135 continue;
4136
4137 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4138 break; // exit
4139 }
4140
4141 if (n)
4142 {
4143 struct sockaddr_in addr;
4144 struct in_addr local;
4145 socklen_t alen;
4146 int c, s;
4147 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4148 int pppoesess_ready = 0;
4149 int pppoesess_pkts = 0;
4150 int tun_ready = 0;
4151 int cluster_ready = 0;
4152 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4153 int tun_pkts = 0;
4154 int cluster_pkts = 0;
4155 #ifdef BGP
4156 uint32_t bgp_events[BGP_NUM_PEERS];
4157 memset(bgp_events, 0, sizeof(bgp_events));
4158 #endif /* BGP */
4159
4160 for (c = n, i = 0; i < c; i++)
4161 {
4162 struct event_data *d = events[i].data.ptr;
4163
4164 switch (d->type)
4165 {
4166 case FD_TYPE_CLI: // CLI connections
4167 {
4168 int cli;
4169
4170 alen = sizeof(addr);
4171 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4172 {
4173 cli_do(cli);
4174 close(cli);
4175 }
4176 else
4177 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4178
4179 n--;
4180 break;
4181 }
4182
4183 // these are handled below, with multiple interleaved reads
4184 case FD_TYPE_CLUSTER: cluster_ready++; break;
4185 case FD_TYPE_TUN: tun_ready++; break;
4186 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4187 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4188
4189 case FD_TYPE_PPPOEDISC: // pppoe discovery
4190 s = read(pppoediscfd, p, size_bufp);
4191 if (s > 0) process_pppoe_disc(p, s);
4192 n--;
4193 break;
4194
4195 case FD_TYPE_CONTROL: // nsctl commands
4196 alen = sizeof(addr);
4197 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4198 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4199 n--;
4200 break;
4201
4202 case FD_TYPE_DAE: // DAE requests
4203 alen = sizeof(addr);
4204 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4205 if (s > 0) processdae(p, s, &addr, alen, &local);
4206 n--;
4207 break;
4208
4209 case FD_TYPE_RADIUS: // RADIUS response
4210 alen = sizeof(addr);
4211 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4212 if (s >= 0 && config->cluster_iam_master)
4213 {
4214 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4215 addr.sin_addr.s_addr == config->radiusserver[1])
4216 processrad(p, s, d->index);
4217 else
4218 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4219 fmtaddr(addr.sin_addr.s_addr, 0));
4220 }
4221
4222 n--;
4223 break;
4224
4225 #ifdef BGP
4226 case FD_TYPE_BGP:
4227 bgp_events[d->index] = events[i].events;
4228 n--;
4229 break;
4230 #endif /* BGP */
4231
4232 case FD_TYPE_NETLINK:
4233 {
4234 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4235 s = netlink_recv(p, size_bufp);
4236 if (nh->nlmsg_type == NLMSG_ERROR)
4237 {
4238 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4239 if (errmsg->error)
4240 {
4241 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4242 {
4243 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4244 exit(1);
4245 }
4246 else
4247 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4248 }
4249 // else it's a ack
4250 }
4251 else
4252 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);
4253 n--;
4254 break;
4255 }
4256
4257 default:
4258 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4259 }
4260 }
4261
4262 #ifdef BGP
4263 bgp_process(bgp_events);
4264 #endif /* BGP */
4265
4266 for (c = 0; n && c < config->multi_read_count; c++)
4267 {
4268 for (j = 0; j < config->nbudpfd; j++)
4269 {
4270 // L2TP and L2TP REMOTE LNS
4271 if (udp_ready[j])
4272 {
4273 alen = sizeof(addr);
4274 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4275 {
4276 processudp(p, s, &addr, j);
4277 udp_pkts[j]++;
4278 }
4279 else
4280 {
4281 udp_ready[j] = 0;
4282 n--;
4283 }
4284 }
4285 }
4286
4287 // incoming IP
4288 if (tun_ready)
4289 {
4290 if ((s = read(tunfd, p, size_bufp)) > 0)
4291 {
4292 processtun(p, s);
4293 tun_pkts++;
4294 }
4295 else
4296 {
4297 tun_ready = 0;
4298 n--;
4299 }
4300 }
4301
4302 // pppoe session
4303 if (pppoesess_ready)
4304 {
4305 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4306 {
4307 process_pppoe_sess(p, s);
4308 pppoesess_pkts++;
4309 }
4310 else
4311 {
4312 pppoesess_ready = 0;
4313 n--;
4314 }
4315 }
4316
4317 // cluster
4318 if (cluster_ready)
4319 {
4320 alen = sizeof(addr);
4321 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4322 {
4323 processcluster(p, s, addr.sin_addr.s_addr);
4324 cluster_pkts++;
4325 }
4326 else
4327 {
4328 cluster_ready = 0;
4329 n--;
4330 }
4331 }
4332 }
4333
4334 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4335 STAT(multi_read_used);
4336
4337 if (c >= config->multi_read_count)
4338 {
4339 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4340 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4341 STAT(multi_read_exceeded);
4342 more++;
4343 }
4344 }
4345 #ifdef BGP
4346 else
4347 /* no event received, but timers could still have expired */
4348 bgp_process_peers_timers();
4349 #endif /* BGP */
4350
4351 if (time_changed)
4352 {
4353 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4354
4355 // Log current traffic stats
4356 snprintf(config->bandwidth, sizeof(config->bandwidth),
4357 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4358 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4359 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4360 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4361
4362 udp_tx = udp_rx = 0;
4363 udp_rx_pkt = eth_rx_pkt = 0;
4364 eth_tx = eth_rx = 0;
4365 time_changed = 0;
4366
4367 if (config->dump_speed)
4368 printf("%s\n", config->bandwidth);
4369
4370 // Update the internal time counter
4371 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4372
4373 {
4374 // Run timer hooks
4375 struct param_timer p = { time_now };
4376 run_plugins(PLUGIN_TIMER, &p);
4377 }
4378 }
4379
4380 // Runs on every machine (master and slaves).
4381 if (next_cluster_ping <= TIME)
4382 {
4383 // Check to see which of the cluster is still alive..
4384
4385 cluster_send_ping(basetime); // Only does anything if we're a slave
4386 cluster_check_master(); // ditto.
4387
4388 cluster_heartbeat(); // Only does anything if we're a master.
4389 cluster_check_slaves(); // ditto.
4390
4391 master_update_counts(); // If we're a slave, send our byte counters to our master.
4392
4393 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4394 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4395 else
4396 next_cluster_ping = TIME + config->cluster_hb_interval;
4397 }
4398
4399 if (!config->cluster_iam_master)
4400 continue;
4401
4402 // Run token bucket filtering queue..
4403 // Only run it every 1/10th of a second.
4404 {
4405 static clockt last_run = 0;
4406 if (last_run != TIME)
4407 {
4408 last_run = TIME;
4409 tbf_run_timer();
4410 }
4411 }
4412
4413 // Handle timeouts, retries etc.
4414 {
4415 static double last_clean = 0;
4416 double this_clean;
4417 double diff;
4418
4419 TIME = now(&this_clean);
4420 diff = this_clean - last_clean;
4421
4422 // Run during idle time (after we've handled
4423 // all incoming packets) or every 1/10th sec
4424 if (!more || diff > 0.1)
4425 {
4426 regular_cleanups(diff);
4427 last_clean = this_clean;
4428 }
4429 }
4430
4431 if (*config->accounting_dir)
4432 {
4433 static clockt next_acct = 0;
4434 static clockt next_shut_acct = 0;
4435
4436 if (next_acct <= TIME)
4437 {
4438 // Dump accounting data
4439 next_acct = TIME + ACCT_TIME;
4440 next_shut_acct = TIME + ACCT_SHUT_TIME;
4441 dump_acct_info(1);
4442 }
4443 else if (next_shut_acct <= TIME)
4444 {
4445 // Dump accounting data for shutdown sessions
4446 next_shut_acct = TIME + ACCT_SHUT_TIME;
4447 if (shut_acct_n)
4448 dump_acct_info(0);
4449 }
4450 }
4451 }
4452
4453 // Are we the master and shutting down??
4454 if (config->cluster_iam_master)
4455 cluster_heartbeat(); // Flush any queued changes..
4456
4457 // Ok. Notify everyone we're shutting down. If we're
4458 // the master, this will force an election.
4459 cluster_send_ping(0);
4460
4461 //
4462 // Important!!! We MUST not process any packets past this point!
4463 LOG(1, 0, 0, "Shutdown complete\n");
4464 }
4465
4466 static void stripdomain(char *host)
4467 {
4468 char *p;
4469
4470 if ((p = strchr(host, '.')))
4471 {
4472 char *domain = 0;
4473 char _domain[1024];
4474
4475 // strip off domain
4476 FILE *resolv = fopen("/etc/resolv.conf", "r");
4477 if (resolv)
4478 {
4479 char buf[1024];
4480 char *b;
4481
4482 while (fgets(buf, sizeof(buf), resolv))
4483 {
4484 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4485 continue;
4486
4487 if (!isspace(buf[6]))
4488 continue;
4489
4490 b = buf + 7;
4491 while (isspace(*b)) b++;
4492
4493 if (*b)
4494 {
4495 char *d = b;
4496 while (*b && !isspace(*b)) b++;
4497 *b = 0;
4498 if (buf[0] == 'd') // domain is canonical
4499 {
4500 domain = d;
4501 break;
4502 }
4503
4504 // first search line
4505 if (!domain)
4506 {
4507 // hold, may be subsequent domain line
4508 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4509 domain = _domain;
4510 }
4511 }
4512 }
4513
4514 fclose(resolv);
4515 }
4516
4517 if (domain)
4518 {
4519 int hl = strlen(host);
4520 int dl = strlen(domain);
4521 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4522 host[hl -dl - 1] = 0;
4523 }
4524 else
4525 {
4526 *p = 0; // everything after first dot
4527 }
4528 }
4529 }
4530
4531 // Init data structures
4532 static void initdata(int optdebug, char *optconfig)
4533 {
4534 int i;
4535
4536 if (!(config = shared_malloc(sizeof(configt))))
4537 {
4538 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4539 exit(1);
4540 }
4541
4542 memset(config, 0, sizeof(configt));
4543 time(&config->start_time);
4544 strncpy(config->config_file, optconfig, strlen(optconfig));
4545 config->debug = optdebug;
4546 config->num_tbfs = MAXTBFS;
4547 config->rl_rate = 28; // 28kbps
4548 config->cluster_mcast_ttl = 1;
4549 config->cluster_master_min_adv = 1;
4550 config->ppp_restart_time = 3;
4551 config->ppp_max_configure = 10;
4552 config->ppp_max_failure = 5;
4553 config->kill_timedout_sessions = 1;
4554 strcpy(config->random_device, RANDOMDEVICE);
4555 // Set default value echo_timeout and idle_echo_timeout
4556 config->echo_timeout = ECHO_TIMEOUT;
4557 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4558
4559 log_stream = stderr;
4560
4561 #ifdef RINGBUFFER
4562 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4563 {
4564 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4565 exit(1);
4566 }
4567 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4568 #endif
4569
4570 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4571 {
4572 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4573 exit(1);
4574 }
4575 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4576 {
4577 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4578 exit(1);
4579 }
4580 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4581 {
4582 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4583 exit(1);
4584 }
4585 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4586 {
4587 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4588 exit(1);
4589 }
4590 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4591 {
4592 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4593 exit(1);
4594 }
4595
4596 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4597 {
4598 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4599 exit(1);
4600 }
4601
4602 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4603 {
4604 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4605 exit(1);
4606 }
4607
4608 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4609 {
4610 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4611 exit(1);
4612 }
4613
4614 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4615 {
4616 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4617 exit(1);
4618 }
4619 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4620
4621 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4622 {
4623 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4624 exit(1);
4625 }
4626 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4627
4628 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4629 {
4630 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4631 exit(1);
4632 }
4633 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4634
4635 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4636 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4637 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4638 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4639 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4640
4641 // Put all the sessions on the free list marked as undefined.
4642 for (i = 1; i < MAXSESSION; i++)
4643 {
4644 session[i].next = i + 1;
4645 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4646 }
4647 session[MAXSESSION - 1].next = 0;
4648 sessionfree = 1;
4649
4650 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4651 for (i = 1; i < MAXTUNNEL; i++)
4652 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4653
4654 for (i = 1; i < MAXBUNDLE; i++) {
4655 bundle[i].state = BUNDLEUNDEF;
4656 }
4657
4658 if (!*hostname)
4659 {
4660 // Grab my hostname unless it's been specified
4661 gethostname(hostname, sizeof(hostname));
4662 stripdomain(hostname);
4663 }
4664
4665 _statistics->start_time = _statistics->last_reset = time(NULL);
4666
4667 #ifdef BGP
4668 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4669 {
4670 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4671 exit(1);
4672 }
4673 #endif /* BGP */
4674
4675 lac_initremotelnsdata();
4676
4677 grp_initdata();
4678 }
4679
4680 static int assign_ip_address(sessionidt s)
4681 {
4682 uint32_t i;
4683 int best = -1;
4684 time_t best_time = time_now;
4685 char *u = session[s].user;
4686 char reuse = 0;
4687
4688
4689 CSTAT(assign_ip_address);
4690
4691 for (i = 1; i < ip_pool_size; i++)
4692 {
4693 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4694 continue;
4695
4696 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4697 {
4698 best = i;
4699 reuse = 1;
4700 break;
4701 }
4702
4703 if (ip_address_pool[i].last < best_time)
4704 {
4705 best = i;
4706 if (!(best_time = ip_address_pool[i].last))
4707 break; // never used, grab this one
4708 }
4709 }
4710
4711 if (best < 0)
4712 {
4713 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4714 return 0;
4715 }
4716
4717 session[s].ip = ip_address_pool[best].address;
4718 session[s].ip_pool_index = best;
4719 ip_address_pool[best].assigned = 1;
4720 ip_address_pool[best].last = time_now;
4721 ip_address_pool[best].session = s;
4722 if (session[s].walled_garden)
4723 /* Don't track addresses of users in walled garden (note: this
4724 means that their address isn't "sticky" even if they get
4725 un-gardened). */
4726 ip_address_pool[best].user[0] = 0;
4727 else
4728 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4729
4730 STAT(ip_allocated);
4731 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4732 reuse ? "Reusing" : "Allocating", best);
4733
4734 return 1;
4735 }
4736
4737 static void free_ip_address(sessionidt s)
4738 {
4739 int i = session[s].ip_pool_index;
4740
4741
4742 CSTAT(free_ip_address);
4743
4744 if (!session[s].ip)
4745 return; // what the?
4746
4747 if (i < 0) // Is this actually part of the ip pool?
4748 i = 0;
4749
4750 STAT(ip_freed);
4751 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4752 session[s].ip = 0;
4753 ip_address_pool[i].assigned = 0;
4754 ip_address_pool[i].session = 0;
4755 ip_address_pool[i].last = time_now;
4756 }
4757
4758 //
4759 // Fsck the address pool against the session table.
4760 // Normally only called when we become a master.
4761 //
4762 // This isn't perfect: We aren't keep tracking of which
4763 // users used to have an IP address.
4764 //
4765 void rebuild_address_pool(void)
4766 {
4767 int i;
4768
4769 //
4770 // Zero the IP pool allocation, and build
4771 // a map from IP address to pool index.
4772 for (i = 1; i < MAXIPPOOL; ++i)
4773 {
4774 ip_address_pool[i].assigned = 0;
4775 ip_address_pool[i].session = 0;
4776 if (!ip_address_pool[i].address)
4777 continue;
4778
4779 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4780 }
4781
4782 for (i = 0; i < MAXSESSION; ++i)
4783 {
4784 int ipid;
4785 if (!(session[i].opened && session[i].ip))
4786 continue;
4787
4788 ipid = - lookup_ipmap(htonl(session[i].ip));
4789
4790 if (session[i].ip_pool_index < 0)
4791 {
4792 // Not allocated out of the pool.
4793 if (ipid < 1) // Not found in the pool either? good.
4794 continue;
4795
4796 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4797 i, fmtaddr(session[i].ip, 0), ipid);
4798
4799 // Fall through and process it as part of the pool.
4800 }
4801
4802
4803 if (ipid > MAXIPPOOL || ipid < 0)
4804 {
4805 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4806 ipid = -1;
4807 session[i].ip_pool_index = ipid;
4808 continue;
4809 }
4810
4811 ip_address_pool[ipid].assigned = 1;
4812 ip_address_pool[ipid].session = i;
4813 ip_address_pool[ipid].last = time_now;
4814 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4815 session[i].ip_pool_index = ipid;
4816 cache_ipmap(session[i].ip, i); // Fix the ip map.
4817 }
4818 }
4819
4820 //
4821 // Fix the address pool to match a changed session.
4822 // (usually when the master sends us an update).
4823 static void fix_address_pool(int sid)
4824 {
4825 int ipid;
4826
4827 ipid = session[sid].ip_pool_index;
4828
4829 if (ipid > ip_pool_size)
4830 return; // Ignore it. rebuild_address_pool will fix it up.
4831
4832 if (ip_address_pool[ipid].address != session[sid].ip)
4833 return; // Just ignore it. rebuild_address_pool will take care of it.
4834
4835 ip_address_pool[ipid].assigned = 1;
4836 ip_address_pool[ipid].session = sid;
4837 ip_address_pool[ipid].last = time_now;
4838 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4839 }
4840
4841 //
4842 // Add a block of addresses to the IP pool to hand out.
4843 //
4844 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4845 {
4846 int i;
4847 if (prefixlen == 0)
4848 prefixlen = 32; // Host route only.
4849
4850 addr &= 0xffffffff << (32 - prefixlen);
4851
4852 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4853 return ;
4854
4855 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4856 {
4857 if ((i & 0xff) == 0 || (i&0xff) == 255)
4858 continue; // Skip 0 and broadcast addresses.
4859
4860 ip_address_pool[ip_pool_size].address = i;
4861 ip_address_pool[ip_pool_size].assigned = 0;
4862 ++ip_pool_size;
4863 if (ip_pool_size >= MAXIPPOOL)
4864 {
4865 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4866 return;
4867 }
4868 }
4869 }
4870
4871 // Initialize the IP address pool
4872 static void initippool()
4873 {
4874 FILE *f;
4875 char *p;
4876 char buf[4096];
4877 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4878
4879 if (!(f = fopen(IPPOOLFILE, "r")))
4880 {
4881 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4882 exit(1);
4883 }
4884
4885 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4886 {
4887 char *pool = buf;
4888 buf[4095] = 0; // Force it to be zero terminated/
4889
4890 if (*buf == '#' || *buf == '\n')
4891 continue; // Skip comments / blank lines
4892 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4893 if ((p = (char *)strchr(buf, ':')))
4894 {
4895 in_addr_t src;
4896 *p = '\0';
4897 src = inet_addr(buf);
4898 if (src == INADDR_NONE)
4899 {
4900 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4901 exit(1);
4902 }
4903 // This entry is for a specific IP only
4904 if (src != config->bind_address)
4905 continue;
4906 *p = ':';
4907 pool = p+1;
4908 }
4909 if ((p = (char *)strchr(pool, '/')))
4910 {
4911 // It's a range
4912 int numbits = 0;
4913 in_addr_t start = 0;
4914
4915 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4916 *p++ = 0;
4917 if (!*p || !(numbits = atoi(p)))
4918 {
4919 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4920 continue;
4921 }
4922 start = ntohl(inet_addr(pool));
4923
4924 // Add a static route for this pool
4925 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4926 fmtaddr(htonl(start), 0), numbits);
4927
4928 routeset(0, start, numbits, 0, 1);
4929
4930 add_to_ip_pool(start, numbits);
4931 }
4932 else
4933 {
4934 // It's a single ip address
4935 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4936 }
4937 }
4938 fclose(f);
4939 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4940 }
4941
4942 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4943 {
4944 struct sockaddr_in snoop_addr = {0};
4945 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4946 return;
4947
4948 snoop_addr.sin_family = AF_INET;
4949 snoop_addr.sin_addr.s_addr = destination;
4950 snoop_addr.sin_port = ntohs(port);
4951
4952 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4953 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4954 htons(snoop_addr.sin_port));
4955
4956 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4957 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4958
4959 STAT(packets_snooped);
4960 }
4961
4962 static int dump_session(FILE **f, sessiont *s)
4963 {
4964 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4965 return 1;
4966
4967 if (!*f)
4968 {
4969 char filename[1024];
4970 char timestr[64];
4971 time_t now = time(NULL);
4972
4973 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4974 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4975
4976 if (!(*f = fopen(filename, "w")))
4977 {
4978 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4979 return 0;
4980 }
4981
4982 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4983 if(config->account_all_origin)
4984 {
4985 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4986 "# host: %s\n"
4987 "# endpoint: %s\n"
4988 "# time: %ld\n"
4989 "# uptime: %ld\n"
4990 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
4991 hostname,
4992 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4993 now,
4994 now - basetime);
4995 }
4996 else
4997 {
4998 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4999 "# host: %s\n"
5000 "# endpoint: %s\n"
5001 "# time: %ld\n"
5002 "# uptime: %ld\n"
5003 "# format: username ip qos uptxoctets downrxoctets\n",
5004 hostname,
5005 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5006 now,
5007 now - basetime);
5008 }
5009 }
5010
5011 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
5012 if(config->account_all_origin)
5013 {
5014 fprintf(*f, "%s %s %d %u %u %s\n",
5015 s->user, // username
5016 fmtaddr(htonl(s->ip), 0), // ip
5017 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5018 (uint32_t) s->cin_delta, // uptxoctets
5019 (uint32_t) s->cout_delta, // downrxoctets
5020 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
5021 }
5022 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
5023 {
5024 fprintf(*f, "%s %s %d %u %u\n",
5025 s->user, // username
5026 fmtaddr(htonl(s->ip), 0), // ip
5027 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5028 (uint32_t) s->cin_delta, // uptxoctets
5029 (uint32_t) s->cout_delta); // downrxoctets
5030 }
5031
5032 s->cin_delta = s->cout_delta = 0;
5033
5034 return 1;
5035 }
5036
5037 static void dump_acct_info(int all)
5038 {
5039 int i;
5040 FILE *f = NULL;
5041
5042
5043 CSTAT(dump_acct_info);
5044
5045 if (shut_acct_n)
5046 {
5047 for (i = 0; i < shut_acct_n; i++)
5048 dump_session(&f, &shut_acct[i]);
5049
5050 shut_acct_n = 0;
5051 }
5052
5053 if (all)
5054 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5055 dump_session(&f, &session[i]);
5056
5057 if (f)
5058 fclose(f);
5059 }
5060
5061 // Main program
5062 int main(int argc, char *argv[])
5063 {
5064 int i;
5065 int optdebug = 0;
5066 char *optconfig = CONFIGFILE;
5067
5068 time(&basetime); // start clock
5069
5070 // scan args
5071 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5072 {
5073 switch (i)
5074 {
5075 case 'd':
5076 if (fork()) exit(0);
5077 setsid();
5078 freopen("/dev/null", "r", stdin);
5079 freopen("/dev/null", "w", stdout);
5080 freopen("/dev/null", "w", stderr);
5081 break;
5082 case 'v':
5083 optdebug++;
5084 break;
5085 case 'c':
5086 optconfig = optarg;
5087 break;
5088 case 'h':
5089 snprintf(hostname, sizeof(hostname), "%s", optarg);
5090 break;
5091 default:
5092 printf("Args are:\n"
5093 "\t-d\t\tDetach from terminal\n"
5094 "\t-c <file>\tConfig file\n"
5095 "\t-h <hostname>\tForce hostname\n"
5096 "\t-v\t\tDebug\n");
5097
5098 return (0);
5099 break;
5100 }
5101 }
5102
5103 // Start the timer routine off
5104 time(&time_now);
5105 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5106
5107 initplugins();
5108 initdata(optdebug, optconfig);
5109
5110 init_cli();
5111 read_config_file();
5112 /* set hostname /after/ having read the config file */
5113 if (*config->hostname)
5114 strcpy(hostname, config->hostname);
5115 cli_init_complete(hostname);
5116 update_config();
5117 init_tbf(config->num_tbfs);
5118
5119 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5120 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5121 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5122 {
5123 struct rlimit rlim;
5124 rlim.rlim_cur = RLIM_INFINITY;
5125 rlim.rlim_max = RLIM_INFINITY;
5126 // Remove the maximum core size
5127 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5128 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5129
5130 // Make core dumps go to /tmp
5131 chdir("/tmp");
5132 }
5133
5134 if (config->scheduler_fifo)
5135 {
5136 int ret;
5137 struct sched_param params = {0};
5138 params.sched_priority = 1;
5139
5140 if (get_nprocs() < 2)
5141 {
5142 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5143 config->scheduler_fifo = 0;
5144 }
5145 else
5146 {
5147 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5148 {
5149 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5150 }
5151 else
5152 {
5153 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5154 config->scheduler_fifo = 0;
5155 }
5156 }
5157 }
5158
5159 initnetlink();
5160
5161 /* Set up the cluster communications port. */
5162 if (cluster_init() < 0)
5163 exit(1);
5164
5165 inittun();
5166 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5167
5168 if (*config->pppoe_if_to_bind)
5169 {
5170 init_pppoe();
5171 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5172 }
5173
5174 if (!config->nbmultiaddress)
5175 {
5176 config->bind_n_address[0] = config->bind_address;
5177 config->nbmultiaddress++;
5178 }
5179 config->nbudpfd = config->nbmultiaddress;
5180 for (i = 0; i < config->nbudpfd; i++)
5181 initudp(&udpfd[i], config->bind_n_address[i]);
5182 initlacudp();
5183 config->indexlacudpfd = config->nbudpfd;
5184 udpfd[config->indexlacudpfd] = udplacfd;
5185 config->nbudpfd++;
5186
5187 initcontrol();
5188 initdae();
5189
5190 // Intercept
5191 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5192
5193 initrad();
5194 initippool();
5195
5196 // seed prng
5197 {
5198 unsigned seed = time_now ^ getpid();
5199 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5200 srand(seed);
5201 }
5202
5203 signal(SIGHUP, sighup_handler);
5204 signal(SIGCHLD, sigchild_handler);
5205 signal(SIGTERM, shutdown_handler);
5206 signal(SIGINT, shutdown_handler);
5207 signal(SIGQUIT, shutdown_handler);
5208
5209 // Prevent us from getting paged out
5210 if (config->lock_pages)
5211 {
5212 if (!mlockall(MCL_CURRENT))
5213 LOG(1, 0, 0, "Locking pages into memory\n");
5214 else
5215 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5216 }
5217
5218 //LOG(3, 0, 0, "Debug sizeof struct: sessiont %lu, tunnelt %lu, bundlet %lu, groupsesst %lu\n",
5219 // sizeof(sessiont), sizeof(tunnelt), sizeof(bundlet), sizeof(groupsesst));
5220
5221 mainloop();
5222
5223 /* remove plugins (so cleanup code gets run) */
5224 plugins_done();
5225
5226 // Remove the PID file if we wrote it
5227 if (config->wrote_pid && *config->pid_file == '/')
5228 unlink(config->pid_file);
5229
5230 /* kill CLI children */
5231 signal(SIGTERM, SIG_IGN);
5232 kill(0, SIGTERM);
5233 return 0;
5234 }
5235
5236 static void sighup_handler(int sig)
5237 {
5238 main_reload++;
5239 }
5240
5241 static void shutdown_handler(int sig)
5242 {
5243 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5244 }
5245
5246 static void sigchild_handler(int sig)
5247 {
5248 while (waitpid(-1, NULL, WNOHANG) > 0)
5249 ;
5250 }
5251
5252 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5253 {
5254 MD5_CTX ctx;
5255 *challenge_response = NULL;
5256
5257 if (!*config->l2tp_secret)
5258 {
5259 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5260 return;
5261 }
5262
5263 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5264
5265 *challenge_response = calloc(17, 1);
5266
5267 MD5_Init(&ctx);
5268 MD5_Update(&ctx, &id, 1);
5269 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5270 MD5_Update(&ctx, challenge, challenge_length);
5271 MD5_Final(*challenge_response, &ctx);
5272
5273 return;
5274 }
5275
5276 static int facility_value(char *name)
5277 {
5278 int i;
5279 for (i = 0; facilitynames[i].c_name; i++)
5280 {
5281 if (strcmp(facilitynames[i].c_name, name) == 0)
5282 return facilitynames[i].c_val;
5283 }
5284 return 0;
5285 }
5286
5287 static void update_config()
5288 {
5289 int i;
5290 char *p;
5291 static int timeout = 0;
5292 static int interval = 0;
5293
5294 // Update logging
5295 closelog();
5296 syslog_log = 0;
5297 if (log_stream)
5298 {
5299 if (log_stream != stderr)
5300 fclose(log_stream);
5301
5302 log_stream = NULL;
5303 }
5304
5305 if (*config->log_filename)
5306 {
5307 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5308 {
5309 char *p = config->log_filename + 7;
5310 if (*p)
5311 {
5312 openlog("l2tpns", LOG_PID, facility_value(p));
5313 syslog_log = 1;
5314 }
5315 }
5316 else if (strchr(config->log_filename, '/') == config->log_filename)
5317 {
5318 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5319 {
5320 fseek(log_stream, 0, SEEK_END);
5321 setbuf(log_stream, NULL);
5322 }
5323 else
5324 {
5325 log_stream = stderr;
5326 setbuf(log_stream, NULL);
5327 }
5328 }
5329 }
5330 else
5331 {
5332 log_stream = stderr;
5333 setbuf(log_stream, NULL);
5334 }
5335
5336 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5337 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5338
5339 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5340 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5341 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5342
5343 // reset MRU/MSS globals
5344 MRU = config->l2tp_mtu - L2TP_HDRS;
5345 if (MRU > PPPoE_MRU)
5346 MRU = PPPoE_MRU;
5347
5348 MSS = MRU - TCP_HDRS;
5349
5350 // Update radius
5351 config->numradiusservers = 0;
5352 for (i = 0; i < MAXRADSERVER; i++)
5353 if (config->radiusserver[i])
5354 {
5355 config->numradiusservers++;
5356 // Set radius port: if not set, take the port from the
5357 // first radius server. For the first radius server,
5358 // take the #defined default value from l2tpns.h
5359
5360 // test twice, In case someone works with
5361 // a secondary radius server without defining
5362 // a primary one, this will work even then.
5363 if (i > 0 && !config->radiusport[i])
5364 config->radiusport[i] = config->radiusport[i-1];
5365 if (!config->radiusport[i])
5366 config->radiusport[i] = RADPORT;
5367 }
5368
5369 if (!config->numradiusservers)
5370 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5371
5372 // parse radius_authtypes_s
5373 config->radius_authtypes = config->radius_authprefer = 0;
5374 p = config->radius_authtypes_s;
5375 while (p && *p)
5376 {
5377 char *s = strpbrk(p, " \t,");
5378 int type = 0;
5379
5380 if (s)
5381 {
5382 *s++ = 0;
5383 while (*s == ' ' || *s == '\t')
5384 s++;
5385
5386 if (!*s)
5387 s = 0;
5388 }
5389
5390 if (!strncasecmp("chap", p, strlen(p)))
5391 type = AUTHCHAP;
5392 else if (!strncasecmp("pap", p, strlen(p)))
5393 type = AUTHPAP;
5394 else
5395 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5396
5397 config->radius_authtypes |= type;
5398 if (!config->radius_authprefer)
5399 config->radius_authprefer = type;
5400
5401 p = s;
5402 }
5403
5404 if (!config->radius_authtypes)
5405 {
5406 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5407 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5408 }
5409
5410 // normalise radius_authtypes_s
5411 if (config->radius_authprefer == AUTHPAP)
5412 {
5413 strcpy(config->radius_authtypes_s, "pap");
5414 if (config->radius_authtypes & AUTHCHAP)
5415 strcat(config->radius_authtypes_s, ", chap");
5416 }
5417 else
5418 {
5419 strcpy(config->radius_authtypes_s, "chap");
5420 if (config->radius_authtypes & AUTHPAP)
5421 strcat(config->radius_authtypes_s, ", pap");
5422 }
5423
5424 if (!config->radius_dae_port)
5425 config->radius_dae_port = DAEPORT;
5426
5427 if(!config->bind_portremotelns)
5428 config->bind_portremotelns = L2TPLACPORT;
5429 if(!config->bind_address_remotelns)
5430 config->bind_address_remotelns = INADDR_ANY;
5431
5432 if (*config->bind_multi_address)
5433 {
5434 char *sip = config->bind_multi_address;
5435 char *n = sip;
5436 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5437 config->nbmultiaddress = 0;
5438
5439 while (*sip && (sip < e))
5440 {
5441 in_addr_t ip = 0;
5442 uint8_t u = 0;
5443
5444 while (n < e && (*n == ',' || *n == ' ')) n++;
5445
5446 while (n < e && (isdigit(*n) || *n == '.'))
5447 {
5448 if (*n == '.')
5449 {
5450 ip = (ip << 8) + u;
5451 u = 0;
5452 }
5453 else
5454 u = u * 10 + *n - '0';
5455 n++;
5456 }
5457 ip = (ip << 8) + u;
5458 n++;
5459
5460 if (ip)
5461 {
5462 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5463 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5464 config->nbmultiaddress++;
5465 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5466
5467 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5468 }
5469
5470 sip = n;
5471 }
5472
5473 if (config->nbmultiaddress >= 1)
5474 {
5475 config->bind_address = config->bind_n_address[0];
5476 config->iftun_address = config->bind_address;
5477 }
5478 }
5479
5480 if(!config->iftun_address)
5481 {
5482 config->iftun_address = config->bind_address;
5483 config->iftun_n_address[0] = config->iftun_address;
5484 }
5485
5486 if (*config->multi_hostname)
5487 {
5488 char *shost = config->multi_hostname;
5489 char *n = shost;
5490 char *e = config->multi_hostname + strlen(config->multi_hostname);
5491 config->nbmultihostname = 0;
5492
5493 while (*shost && (shost < e))
5494 {
5495 while ((n < e) && (*n == ' ' || *n == ',' || *n == '\t')) n++;
5496
5497 i = 0;
5498 while (n < e && (*n != ',') && (*n != '\t'))
5499 {
5500 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5501 n++;i++;
5502 }
5503
5504 if (i > 0)
5505 {
5506 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5507 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5508 config->nbmultihostname++;
5509 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5510 }
5511
5512 shost = n;
5513 }
5514
5515 if (config->nbmultihostname >= 1)
5516 {
5517 strcpy(hostname, config->multi_n_hostname[0]);
5518 strcpy(config->hostname, hostname);
5519 }
5520 }
5521
5522 if (!*config->pppoe_ac_name)
5523 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5524
5525 // re-initialise the random number source
5526 initrandom(config->random_device);
5527
5528 // Update plugins
5529 for (i = 0; i < MAXPLUGINS; i++)
5530 {
5531 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5532 continue;
5533
5534 if (*config->plugins[i])
5535 {
5536 // Plugin added
5537 add_plugin(config->plugins[i]);
5538 }
5539 else if (*config->old_plugins[i])
5540 {
5541 // Plugin removed
5542 remove_plugin(config->old_plugins[i]);
5543 }
5544 }
5545
5546 // Guest change
5547 guest_accounts_num = 0;
5548 char *p2 = config->guest_user;
5549 while (p2 && *p2)
5550 {
5551 char *s = strpbrk(p2, " \t,");
5552 if (s)
5553 {
5554 *s++ = 0;
5555 while (*s == ' ' || *s == '\t')
5556 s++;
5557
5558 if (!*s)
5559 s = 0;
5560 }
5561
5562 strcpy(guest_users[guest_accounts_num], p2);
5563 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5564 guest_accounts_num++;
5565 p2 = s;
5566 }
5567 // Rebuild the guest_user array
5568 strcpy(config->guest_user, "");
5569 int ui = 0;
5570 for (ui=0; ui<guest_accounts_num; ui++)
5571 {
5572 strcat(config->guest_user, guest_users[ui]);
5573 if (ui<guest_accounts_num-1)
5574 {
5575 strcat(config->guest_user, ",");
5576 }
5577 }
5578
5579
5580 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5581 if (!config->multi_read_count) config->multi_read_count = 10;
5582 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5583 if (!*config->cluster_interface)
5584 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5585
5586 if (!config->cluster_hb_interval)
5587 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5588
5589 if (!config->cluster_hb_timeout)
5590 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5591
5592 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5593 {
5594 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5595 // late, ensure we're sufficiently larger than that
5596 int t = 4 * config->cluster_hb_interval + 11;
5597
5598 if (config->cluster_hb_timeout < t)
5599 {
5600 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5601 config->cluster_hb_timeout = t;
5602 }
5603
5604 // Push timing changes to the slaves immediately if we're the master
5605 if (config->cluster_iam_master)
5606 cluster_heartbeat();
5607
5608 interval = config->cluster_hb_interval;
5609 timeout = config->cluster_hb_timeout;
5610 }
5611
5612 // Write PID file
5613 if (*config->pid_file == '/' && !config->wrote_pid)
5614 {
5615 FILE *f;
5616 if ((f = fopen(config->pid_file, "w")))
5617 {
5618 fprintf(f, "%d\n", getpid());
5619 fclose(f);
5620 config->wrote_pid = 1;
5621 }
5622 else
5623 {
5624 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5625 }
5626 }
5627 }
5628
5629 static void read_config_file()
5630 {
5631 FILE *f;
5632
5633 if (!config->config_file) return;
5634 if (!(f = fopen(config->config_file, "r")))
5635 {
5636 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5637 return;
5638 }
5639
5640 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5641 cli_do_file(f);
5642 LOG(3, 0, 0, "Done reading config file\n");
5643 fclose(f);
5644 }
5645
5646 int sessionsetup(sessionidt s, tunnelidt t)
5647 {
5648 // A session now exists, set it up
5649 in_addr_t ip;
5650 char *user;
5651 sessionidt i;
5652 int r;
5653
5654 CSTAT(sessionsetup);
5655
5656 LOG(3, s, t, "Doing session setup for session\n");
5657
5658 // Join a bundle if the MRRU option is accepted
5659 if(session[s].mrru > 0 && session[s].bundle == 0)
5660 {
5661 LOG(3, s, t, "This session can be part of multilink bundle\n");
5662 if (join_bundle(s) > 0)
5663 cluster_send_bundle(session[s].bundle);
5664 else
5665 {
5666 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5667 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5668 return 0;
5669 }
5670 }
5671
5672 if (!session[s].ip)
5673 {
5674 assign_ip_address(s);
5675 if (!session[s].ip)
5676 {
5677 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5678 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5679 return 0;
5680 }
5681 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5682 fmtaddr(htonl(session[s].ip), 0));
5683 }
5684
5685 // Make sure this is right
5686 session[s].tunnel = t;
5687
5688 // zap old sessions with same IP and/or username
5689 // Don't kill gardened sessions - doing so leads to a DoS
5690 // from someone who doesn't need to know the password
5691 {
5692 ip = session[s].ip;
5693 user = session[s].user;
5694 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5695 {
5696 if (i == s) continue;
5697 if (!session[s].opened) break;
5698 // Allow duplicate sessions for multilink ones of the same bundle.
5699 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5700
5701 if (ip == session[i].ip)
5702 {
5703 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5704 continue;
5705 }
5706
5707 if (config->allow_duplicate_users) continue;
5708 if (session[s].walled_garden || session[i].walled_garden) continue;
5709 // Guest change
5710 int found = 0;
5711 int gu;
5712 for (gu = 0; gu < guest_accounts_num; gu++)
5713 {
5714 if (!strcasecmp(user, guest_users[gu]))
5715 {
5716 found = 1;
5717 break;
5718 }
5719 }
5720 if (found) continue;
5721
5722 // Drop the new session in case of duplicate sessionss, not the old one.
5723 if (!strcasecmp(user, session[i].user))
5724 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5725 }
5726 }
5727
5728 // no need to set a route for the same IP address of the bundle
5729 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5730 {
5731 int routed = 0;
5732 groupidt g;
5733
5734 // Add the route for this session.
5735 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5736 {
5737 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5738 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5739 routed++;
5740
5741 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5742 }
5743
5744 // Static IPs need to be routed if not already
5745 // convered by a Framed-Route. Anything else is part
5746 // of the IP address pool and is already routed, it
5747 // just needs to be added to the IP cache.
5748 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5749 if (session[s].ip_pool_index == -1) // static ip
5750 {
5751 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5752 }
5753 else
5754 cache_ipmap(session[s].ip, s);
5755
5756 if ((g = grp_groupbysession(s)))
5757 {
5758 grp_setgrouproute(g, 1);
5759 cluster_send_groupe(g);
5760 }
5761 }
5762
5763 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5764 lcp_open(s, t); // transition to Network phase and send initial IPCP
5765
5766 // Run the plugin's against this new session.
5767 {
5768 struct param_new_session data = { &tunnel[t], &session[s] };
5769 run_plugins(PLUGIN_NEW_SESSION, &data);
5770 }
5771
5772 // Allocate TBFs if throttled
5773 if (session[s].throttle_in || session[s].throttle_out)
5774 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5775
5776 session[s].last_packet = session[s].last_data = time_now;
5777
5778 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5779 fmtaddr(htonl(session[s].ip), 0),
5780 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5781
5782 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5783
5784 return 1; // RADIUS OK and IP allocated, done...
5785 }
5786
5787 //
5788 // This session just got dropped on us by the master or something.
5789 // Make sure our tables up up to date...
5790 //
5791 int load_session(sessionidt s, sessiont *new)
5792 {
5793 int i;
5794 int newip = 0;
5795
5796 // Sanity checks.
5797 if (new->ip_pool_index >= MAXIPPOOL ||
5798 new->tunnel >= MAXTUNNEL)
5799 {
5800 LOG(0, s, 0, "Strange session update received!\n");
5801 // FIXME! What to do here?
5802 return 0;
5803 }
5804
5805 //
5806 // Ok. All sanity checks passed. Now we're committed to
5807 // loading the new session.
5808 //
5809
5810 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5811
5812 // See if routes/ip cache need updating
5813 if (new->ip != session[s].ip)
5814 newip++;
5815
5816 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5817 if (new->route[i].ip != session[s].route[i].ip ||
5818 new->route[i].prefixlen != session[s].route[i].prefixlen)
5819 newip++;
5820
5821 // needs update
5822 if (newip)
5823 {
5824 int routed = 0;
5825
5826 // remove old routes...
5827 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5828 {
5829 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5830 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5831 routed++;
5832
5833 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5834 }
5835
5836 // ...ip
5837 if (session[s].ip)
5838 {
5839 if (session[s].ip_pool_index == -1) // static IP
5840 {
5841 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5842 }
5843 else // It's part of the IP pool, remove it manually.
5844 uncache_ipmap(session[s].ip);
5845 }
5846
5847 routed = 0;
5848
5849 // add new routes...
5850 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5851 {
5852 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5853 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5854 routed++;
5855
5856 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5857 }
5858
5859 // ...ip
5860 if (new->ip)
5861 {
5862 // If there's a new one, add it.
5863 if (new->ip_pool_index == -1)
5864 {
5865 if (!routed) routeset(s, new->ip, 0, 0, 1);
5866 }
5867 else
5868 cache_ipmap(new->ip, s);
5869 }
5870 }
5871
5872 // check v6 routing
5873 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5874 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5875
5876 // check filters
5877 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5878 {
5879 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5880 new->filter_in = 0;
5881 }
5882
5883 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5884 {
5885 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5886 new->filter_out = 0;
5887 }
5888
5889 if (new->filter_in != session[s].filter_in)
5890 {
5891 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5892 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5893 }
5894
5895 if (new->filter_out != session[s].filter_out)
5896 {
5897 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5898 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5899 }
5900
5901 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5902 // for walking the sessions to forward byte counts to the master.
5903 config->cluster_highest_sessionid = s;
5904
5905 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5906
5907 // Do fixups into address pool.
5908 if (new->ip_pool_index != -1)
5909 fix_address_pool(s);
5910
5911 return 1;
5912 }
5913
5914 static void initplugins()
5915 {
5916 int i;
5917
5918 loaded_plugins = ll_init();
5919 // Initialize the plugins to nothing
5920 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5921 plugins[i] = ll_init();
5922 }
5923
5924 static void *open_plugin(char *plugin_name, int load)
5925 {
5926 char path[256] = "";
5927
5928 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5929 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5930 return dlopen(path, RTLD_NOW);
5931 }
5932
5933 // plugin callback to get a config value
5934 static void *getconfig(char *key, enum config_typet type)
5935 {
5936 int i;
5937
5938 for (i = 0; config_values[i].key; i++)
5939 {
5940 if (!strcmp(config_values[i].key, key))
5941 {
5942 if (config_values[i].type == type)
5943 return ((void *) config) + config_values[i].offset;
5944
5945 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5946 key, type, config_values[i].type);
5947
5948 return 0;
5949 }
5950 }
5951
5952 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5953 return 0;
5954 }
5955
5956 static int add_plugin(char *plugin_name)
5957 {
5958 static struct pluginfuncs funcs = {
5959 _log,
5960 _log_hex,
5961 fmtaddr,
5962 sessionbyuser,
5963 sessiontbysessionidt,
5964 sessionidtbysessiont,
5965 radiusnew,
5966 radiussend,
5967 getconfig,
5968 sessionshutdown,
5969 sessionkill,
5970 throttle_session,
5971 cluster_send_session,
5972 };
5973
5974 void *p = open_plugin(plugin_name, 1);
5975 int (*initfunc)(struct pluginfuncs *);
5976 int i;
5977
5978 if (!p)
5979 {
5980 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5981 return -1;
5982 }
5983
5984 if (ll_contains(loaded_plugins, p))
5985 {
5986 dlclose(p);
5987 return 0; // already loaded
5988 }
5989
5990 {
5991 int *v = dlsym(p, "plugin_api_version");
5992 if (!v || *v != PLUGIN_API_VERSION)
5993 {
5994 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5995 dlclose(p);
5996 return -1;
5997 }
5998 }
5999
6000 if ((initfunc = dlsym(p, "plugin_init")))
6001 {
6002 if (!initfunc(&funcs))
6003 {
6004 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6005 dlclose(p);
6006 return -1;
6007 }
6008 }
6009
6010 ll_push(loaded_plugins, p);
6011
6012 for (i = 0; i < max_plugin_functions; i++)
6013 {
6014 void *x;
6015 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6016 {
6017 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
6018 ll_push(plugins[i], x);
6019 }
6020 }
6021
6022 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
6023 return 1;
6024 }
6025
6026 static void run_plugin_done(void *plugin)
6027 {
6028 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
6029
6030 if (donefunc)
6031 donefunc();
6032 }
6033
6034 static int remove_plugin(char *plugin_name)
6035 {
6036 void *p = open_plugin(plugin_name, 0);
6037 int loaded = 0;
6038
6039 if (!p)
6040 return -1;
6041
6042 if (ll_contains(loaded_plugins, p))
6043 {
6044 int i;
6045 for (i = 0; i < max_plugin_functions; i++)
6046 {
6047 void *x;
6048 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6049 ll_delete(plugins[i], x);
6050 }
6051
6052 ll_delete(loaded_plugins, p);
6053 run_plugin_done(p);
6054 loaded = 1;
6055 }
6056
6057 dlclose(p);
6058 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6059 return loaded;
6060 }
6061
6062 int run_plugins(int plugin_type, void *data)
6063 {
6064 int (*func)(void *data);
6065
6066 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6067 return PLUGIN_RET_ERROR;
6068
6069 ll_reset(plugins[plugin_type]);
6070 while ((func = ll_next(plugins[plugin_type])))
6071 {
6072 int r = func(data);
6073
6074 if (r != PLUGIN_RET_OK)
6075 return r; // stop here
6076 }
6077
6078 return PLUGIN_RET_OK;
6079 }
6080
6081 static void plugins_done()
6082 {
6083 void *p;
6084
6085 ll_reset(loaded_plugins);
6086 while ((p = ll_next(loaded_plugins)))
6087 run_plugin_done(p);
6088 }
6089
6090 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6091 {
6092 struct nsctl request;
6093 struct nsctl response;
6094 int type = unpack_control(&request, buf, len);
6095 int r;
6096 void *p;
6097
6098 if (log_stream && config->debug >= 4)
6099 {
6100 if (type < 0)
6101 {
6102 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6103 fmtaddr(addr->sin_addr.s_addr, 0), type);
6104 }
6105 else
6106 {
6107 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6108 dump_control(&request, log_stream);
6109 }
6110 }
6111
6112 switch (type)
6113 {
6114 case NSCTL_REQ_LOAD:
6115 if (request.argc != 1)
6116 {
6117 response.type = NSCTL_RES_ERR;
6118 response.argc = 1;
6119 response.argv[0] = "name of plugin required";
6120 }
6121 else if ((r = add_plugin(request.argv[0])) < 1)
6122 {
6123 response.type = NSCTL_RES_ERR;
6124 response.argc = 1;
6125 response.argv[0] = !r
6126 ? "plugin already loaded"
6127 : "error loading plugin";
6128 }
6129 else
6130 {
6131 response.type = NSCTL_RES_OK;
6132 response.argc = 0;
6133 }
6134
6135 break;
6136
6137 case NSCTL_REQ_UNLOAD:
6138 if (request.argc != 1)
6139 {
6140 response.type = NSCTL_RES_ERR;
6141 response.argc = 1;
6142 response.argv[0] = "name of plugin required";
6143 }
6144 else if ((r = remove_plugin(request.argv[0])) < 1)
6145 {
6146 response.type = NSCTL_RES_ERR;
6147 response.argc = 1;
6148 response.argv[0] = !r
6149 ? "plugin not loaded"
6150 : "plugin not found";
6151 }
6152 else
6153 {
6154 response.type = NSCTL_RES_OK;
6155 response.argc = 0;
6156 }
6157
6158 break;
6159
6160 case NSCTL_REQ_HELP:
6161 response.type = NSCTL_RES_OK;
6162 response.argc = 0;
6163
6164 ll_reset(loaded_plugins);
6165 while ((p = ll_next(loaded_plugins)))
6166 {
6167 char **help = dlsym(p, "plugin_control_help");
6168 while (response.argc < 0xff && help && *help)
6169 response.argv[response.argc++] = *help++;
6170 }
6171
6172 break;
6173
6174 case NSCTL_REQ_CONTROL:
6175 {
6176 struct param_control param = {
6177 config->cluster_iam_master,
6178 request.argc,
6179 request.argv,
6180 0,
6181 NULL,
6182 };
6183
6184 int r = run_plugins(PLUGIN_CONTROL, &param);
6185
6186 if (r == PLUGIN_RET_ERROR)
6187 {
6188 response.type = NSCTL_RES_ERR;
6189 response.argc = 1;
6190 response.argv[0] = param.additional
6191 ? param.additional
6192 : "error returned by plugin";
6193 }
6194 else if (r == PLUGIN_RET_NOTMASTER)
6195 {
6196 static char msg[] = "must be run on master: 000.000.000.000";
6197
6198 response.type = NSCTL_RES_ERR;
6199 response.argc = 1;
6200 if (config->cluster_master_address)
6201 {
6202 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6203 response.argv[0] = msg;
6204 }
6205 else
6206 {
6207 response.argv[0] = "must be run on master: none elected";
6208 }
6209 }
6210 else if (!(param.response & NSCTL_RESPONSE))
6211 {
6212 response.type = NSCTL_RES_ERR;
6213 response.argc = 1;
6214 response.argv[0] = param.response
6215 ? "unrecognised response value from plugin"
6216 : "unhandled action";
6217 }
6218 else
6219 {
6220 response.type = param.response;
6221 response.argc = 0;
6222 if (param.additional)
6223 {
6224 response.argc = 1;
6225 response.argv[0] = param.additional;
6226 }
6227 }
6228 }
6229
6230 break;
6231
6232 default:
6233 response.type = NSCTL_RES_ERR;
6234 response.argc = 1;
6235 response.argv[0] = "error unpacking control packet";
6236 }
6237
6238 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6239 if (!buf)
6240 {
6241 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6242 return;
6243 }
6244
6245 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6246 if (r > 0)
6247 {
6248 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6249 if (log_stream && config->debug >= 4)
6250 {
6251 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6252 dump_control(&response, log_stream);
6253 }
6254 }
6255 else
6256 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6257 fmtaddr(addr->sin_addr.s_addr, 0), r);
6258
6259 free(buf);
6260 }
6261
6262 static tunnelidt new_tunnel()
6263 {
6264 tunnelidt i;
6265 for (i = 1; i < MAXTUNNEL; i++)
6266 {
6267 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6268 {
6269 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6270 if (i > config->cluster_highest_tunnelid)
6271 config->cluster_highest_tunnelid = i;
6272 return i;
6273 }
6274 }
6275 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6276 return 0;
6277 }
6278
6279 //
6280 // We're becoming the master. Do any required setup..
6281 //
6282 // This is principally telling all the plugins that we're
6283 // now a master, and telling them about all the sessions
6284 // that are active too..
6285 //
6286 void become_master(void)
6287 {
6288 int s, i;
6289 static struct event_data d[RADIUS_FDS];
6290 struct epoll_event e;
6291
6292 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6293
6294 // running a bunch of iptables commands is slow and can cause
6295 // the master to drop tunnels on takeover--kludge around the
6296 // problem by forking for the moment (note: race)
6297 if (!fork_and_close())
6298 {
6299 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6300 {
6301 if (!session[s].opened) // Not an in-use session.
6302 continue;
6303
6304 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6305 }
6306 exit(0);
6307 }
6308
6309 // add radius fds
6310 e.events = EPOLLIN;
6311 for (i = 0; i < RADIUS_FDS; i++)
6312 {
6313 d[i].type = FD_TYPE_RADIUS;
6314 d[i].index = i;
6315 e.data.ptr = &d[i];
6316
6317 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6318 }
6319 }
6320
6321 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6322 {
6323 int s, i;
6324 int count = 0;
6325 int buckets[64];
6326
6327 if (CLI_HELP_REQUESTED)
6328 return CLI_HELP_NO_ARGS;
6329
6330 time(&time_now);
6331 for (i = 0; i < 64;++i) buckets[i] = 0;
6332
6333 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6334 {
6335 int idle;
6336 if (!session[s].opened)
6337 continue;
6338
6339 idle = time_now - session[s].last_data;
6340 idle /= 5 ; // In multiples of 5 seconds.
6341 if (idle < 0)
6342 idle = 0;
6343 if (idle > 63)
6344 idle = 63;
6345
6346 ++count;
6347 ++buckets[idle];
6348 }
6349
6350 for (i = 0; i < 63; ++i)
6351 {
6352 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6353 }
6354 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6355 cli_print(cli, "%d total sessions open.", count);
6356 return CLI_OK;
6357 }
6358
6359 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6360 {
6361 int s, i;
6362 int count = 0;
6363 int buckets[64];
6364
6365 if (CLI_HELP_REQUESTED)
6366 return CLI_HELP_NO_ARGS;
6367
6368 time(&time_now);
6369 for (i = 0; i < 64;++i) buckets[i] = 0;
6370
6371 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6372 {
6373 int open = 0, d;
6374 if (!session[s].opened)
6375 continue;
6376
6377 d = time_now - session[s].opened;
6378 if (d < 0)
6379 d = 0;
6380 while (d > 1 && open < 32)
6381 {
6382 ++open;
6383 d >>= 1; // half.
6384 }
6385 ++count;
6386 ++buckets[open];
6387 }
6388
6389 s = 1;
6390 for (i = 0; i < 30; ++i)
6391 {
6392 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6393 s <<= 1;
6394 }
6395 cli_print(cli, "%d total sessions open.", count);
6396 return CLI_OK;
6397 }
6398
6399 /* Unhide an avp.
6400 *
6401 * This unencodes the AVP using the L2TP secret and the previously
6402 * stored random vector. It overwrites the hidden data with the
6403 * unhidden AVP subformat.
6404 */
6405 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6406 {
6407 MD5_CTX ctx;
6408 uint8_t digest[16];
6409 uint8_t *last;
6410 size_t d = 0;
6411 uint16_t m = htons(type);
6412
6413 // Compute initial pad
6414 MD5_Init(&ctx);
6415 MD5_Update(&ctx, (unsigned char *) &m, 2);
6416 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6417 MD5_Update(&ctx, vector, vec_len);
6418 MD5_Final(digest, &ctx);
6419
6420 // pointer to last decoded 16 octets
6421 last = value;
6422
6423 while (len > 0)
6424 {
6425 // calculate a new pad based on the last decoded block
6426 if (d >= sizeof(digest))
6427 {
6428 MD5_Init(&ctx);
6429 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6430 MD5_Update(&ctx, last, sizeof(digest));
6431 MD5_Final(digest, &ctx);
6432
6433 d = 0;
6434 last = value;
6435 }
6436
6437 *value++ ^= digest[d++];
6438 len--;
6439 }
6440 }
6441
6442 int find_filter(char const *name, size_t len)
6443 {
6444 int free = -1;
6445 int i;
6446
6447 for (i = 0; i < MAXFILTER; i++)
6448 {
6449 if (!*ip_filters[i].name)
6450 {
6451 if (free < 0)
6452 free = i;
6453
6454 continue;
6455 }
6456
6457 if (strlen(ip_filters[i].name) != len)
6458 continue;
6459
6460 if (!strncmp(ip_filters[i].name, name, len))
6461 return i;
6462 }
6463
6464 return free;
6465 }
6466
6467 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6468 {
6469 switch (p->op)
6470 {
6471 case FILTER_PORT_OP_EQ: return port == p->port;
6472 case FILTER_PORT_OP_NEQ: return port != p->port;
6473 case FILTER_PORT_OP_GT: return port > p->port;
6474 case FILTER_PORT_OP_LT: return port < p->port;
6475 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6476 }
6477
6478 return 0;
6479 }
6480
6481 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6482 {
6483 switch (op)
6484 {
6485 case FILTER_FLAG_OP_ANY:
6486 return (flags & sflags) || (~flags & cflags);
6487
6488 case FILTER_FLAG_OP_ALL:
6489 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6490
6491 case FILTER_FLAG_OP_EST:
6492 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6493 }
6494
6495 return 0;
6496 }
6497
6498 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6499 {
6500 uint16_t frag_offset;
6501 uint8_t proto;
6502 in_addr_t src_ip;
6503 in_addr_t dst_ip;
6504 uint16_t src_port = 0;
6505 uint16_t dst_port = 0;
6506 uint8_t flags = 0;
6507 ip_filter_rulet *rule;
6508
6509 if (len < 20) // up to end of destination address
6510 return 0;
6511
6512 if ((*buf >> 4) != 4) // IPv4
6513 return 0;
6514
6515 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6516 proto = buf[9];
6517 src_ip = *(in_addr_t *) (buf + 12);
6518 dst_ip = *(in_addr_t *) (buf + 16);
6519
6520 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6521 {
6522 int l = (buf[0] & 0xf) * 4; // length of IP header
6523 if (len < l + 4) // ports
6524 return 0;
6525
6526 src_port = ntohs(*(uint16_t *) (buf + l));
6527 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6528 if (proto == IPPROTO_TCP)
6529 {
6530 if (len < l + 14) // flags
6531 return 0;
6532
6533 flags = buf[l + 13] & 0x3f;
6534 }
6535 }
6536
6537 for (rule = ip_filters[filter].rules; rule->action; rule++)
6538 {
6539 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6540 continue;
6541
6542 if (rule->src_wild != INADDR_BROADCAST &&
6543 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6544 continue;
6545
6546 if (rule->dst_wild != INADDR_BROADCAST &&
6547 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6548 continue;
6549
6550 if (frag_offset)
6551 {
6552 // layer 4 deny rules are skipped
6553 if (rule->action == FILTER_ACTION_DENY &&
6554 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6555 continue;
6556 }
6557 else
6558 {
6559 if (rule->frag)
6560 continue;
6561
6562 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6563 {
6564 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6565 continue;
6566
6567 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6568 continue;
6569
6570 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6571 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6572 continue;
6573 }
6574 }
6575
6576 // matched
6577 rule->counter++;
6578 return rule->action == FILTER_ACTION_PERMIT;
6579 }
6580
6581 // default deny
6582 return 0;
6583 }
6584
6585 tunnelidt lac_new_tunnel()
6586 {
6587 return new_tunnel();
6588 }
6589
6590 void lac_tunnelclear(tunnelidt t)
6591 {
6592 tunnelclear(t);
6593 }
6594
6595 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6596 {
6597 uint16_t version = 0x0100; // protocol version
6598
6599 tunnel[t].state = TUNNELOPENING;
6600
6601 // Sent SCCRQ - Start Control Connection Request
6602 controlt *c = controlnew(1); // sending SCCRQ
6603 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6604 controls(c, 8, Vendor_name, 1); // Vendor name
6605 control16(c, 2, version, 1); // protocol version
6606 control32(c, 3, 3, 1); // framing Capabilities
6607 control16(c, 9, t, 1); // assigned tunnel
6608 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6609 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6610 controladd(c, 0, t); // send
6611 }
6612
6613 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6614 {
6615 // Sent ICRQ Incoming-call-request
6616 controlt *c = controlnew(10); // ICRQ
6617
6618 control16(c, 14, s, 1); // assigned sesion
6619 call_serial_number++;
6620 control32(c, 15, call_serial_number, 1); // call serial number
6621 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6622 controladd(c, 0, t); // send
6623 }
6624
6625 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6626 {
6627 tunnelshutdown(t, reason, result, error, msg);
6628 }
6629