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[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;
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 = *(uint32_t *)(buf + 16);
1450 if ((g = grp_groupbyip(ip)))
1451 {
1452 s = grp_getnextsession(g, ip);
1453 if (!s)
1454 {
1455 // Is this a packet for a session that doesn't exist?
1456 static int rate = 0; // Number of ICMP packets we've sent this second.
1457 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1458
1459 if (last != time_now)
1460 {
1461 last = time_now;
1462 rate = 0;
1463 }
1464
1465 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1466 {
1467 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1468 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1469 config->bind_address ? config->bind_address : my_address, buf, len);
1470 }
1471 return;
1472 }
1473 }
1474 else if (!(s = sessionbyip(ip)))
1475 {
1476 // Is this a packet for a session that doesn't exist?
1477 static int rate = 0; // Number of ICMP packets we've sent this second.
1478 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1479
1480 if (last != time_now)
1481 {
1482 last = time_now;
1483 rate = 0;
1484 }
1485
1486 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1487 {
1488 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1489 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1490 config->bind_address ? config->bind_address : my_address, buf, len);
1491 }
1492 return;
1493 }
1494
1495 t = session[s].tunnel;
1496 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1497 {
1498 LOG(3, s, t, "Packet size more than session MRU\n");
1499 return;
1500 }
1501
1502 sp = &session[s];
1503
1504 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1505 if (config->max_packets > 0)
1506 {
1507 if (sess_local[s].last_packet_out == TIME)
1508 {
1509 int max = config->max_packets;
1510
1511 // All packets for throttled sessions are handled by the
1512 // master, so further limit by using the throttle rate.
1513 // A bit of a kludge, since throttle rate is in kbps,
1514 // but should still be generous given our average DSL
1515 // packet size is 200 bytes: a limit of 28kbps equates
1516 // to around 180 packets per second.
1517 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1518 max = sp->throttle_out;
1519
1520 if (++sess_local[s].packets_out > max)
1521 {
1522 sess_local[s].packets_dropped++;
1523 return;
1524 }
1525 }
1526 else
1527 {
1528 if (sess_local[s].packets_dropped)
1529 {
1530 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1531 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1532 sess_local[s].packets_dropped, sess_local[s].packets_out,
1533 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1534 sp->user);
1535 }
1536
1537 sess_local[s].last_packet_out = TIME;
1538 sess_local[s].packets_out = 1;
1539 sess_local[s].packets_dropped = 0;
1540 }
1541 }
1542
1543 // run access-list if any
1544 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1545 return;
1546
1547 // adjust MSS on SYN and SYN,ACK packets with options
1548 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1549 {
1550 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1551 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1552 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1553 }
1554
1555 if (sp->tbf_out)
1556 {
1557 // Are we throttling this session?
1558 if (config->cluster_iam_master)
1559 tbf_queue_packet(sp->tbf_out, data, size);
1560 else
1561 master_throttle_packet(sp->tbf_out, data, size);
1562 return;
1563 }
1564
1565 if (sp->walled_garden && !config->cluster_iam_master)
1566 {
1567 // We are walled-gardening this
1568 master_garden_packet(s, data, size);
1569 return;
1570 }
1571
1572 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1573 {
1574
1575 if (!config->cluster_iam_master)
1576 {
1577 // The MPPP packets must be managed by the Master.
1578 master_forward_mppp_packet(s, data, size);
1579 return;
1580 }
1581
1582 // Add on L2TP header
1583 sessionidt members[MAXBUNDLESES];
1584 bundleidt bid = session[s].bundle;
1585 bundlet *b = &bundle[bid];
1586 uint32_t num_of_links, nb_opened;
1587 int i;
1588
1589 num_of_links = b->num_of_links;
1590 nb_opened = 0;
1591 for (i = 0;i < num_of_links;i++)
1592 {
1593 s = b->members[i];
1594 if (session[s].ppp.lcp == Opened)
1595 {
1596 members[nb_opened] = s;
1597 nb_opened++;
1598 }
1599 }
1600
1601 if (nb_opened < 1)
1602 {
1603 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1604 return;
1605 }
1606
1607 num_of_links = nb_opened;
1608 b->current_ses = (b->current_ses + 1) % num_of_links;
1609 s = members[b->current_ses];
1610 t = session[s].tunnel;
1611 sp = &session[s];
1612 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1613
1614 if (num_of_links > 1)
1615 {
1616 if(len > MINFRAGLEN)
1617 {
1618 //for rotate traffic among the member links
1619 uint32_t divisor = num_of_links;
1620 if (divisor > 2)
1621 divisor = divisor/2 + (divisor & 1);
1622
1623 // Partition the packet to "num_of_links" fragments
1624 uint32_t fraglen = len / divisor;
1625 uint32_t last_fraglen = fraglen + len % divisor;
1626 uint32_t remain = len;
1627
1628 // send the first packet
1629 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1630 if (!p) return;
1631 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1632
1633 // statistics
1634 update_session_out_stat(s, sp, fraglen);
1635
1636 remain -= fraglen;
1637 while (remain > last_fraglen)
1638 {
1639 b->current_ses = (b->current_ses + 1) % num_of_links;
1640 s = members[b->current_ses];
1641 t = session[s].tunnel;
1642 sp = &session[s];
1643 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1644 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1645 if (!p) return;
1646 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1647 update_session_out_stat(s, sp, fraglen);
1648 remain -= fraglen;
1649 }
1650 // send the last fragment
1651 b->current_ses = (b->current_ses + 1) % num_of_links;
1652 s = members[b->current_ses];
1653 t = session[s].tunnel;
1654 sp = &session[s];
1655 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1656 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1657 if (!p) return;
1658 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1659 update_session_out_stat(s, sp, remain);
1660 if (remain != last_fraglen)
1661 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1662 }
1663 else
1664 {
1665 // Send it as one frame
1666 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1667 if (!p) return;
1668 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1669 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1670 update_session_out_stat(s, sp, len);
1671 }
1672 }
1673 else
1674 {
1675 // Send it as one frame (NO MPPP Frame)
1676 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1677 tunnelsend(p, len + (buf-p), t); // send it...
1678 update_session_out_stat(s, sp, len);
1679 }
1680 }
1681 else
1682 {
1683 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1684 tunnelsend(p, len + (buf-p), t); // send it...
1685 update_session_out_stat(s, sp, len);
1686 }
1687
1688 // Snooping this session, send it to intercept box
1689 if (sp->snoop_ip && sp->snoop_port)
1690 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1691
1692 udp_tx += len;
1693 }
1694
1695 // process outgoing (to tunnel) IPv6
1696 //
1697 static void processipv6out(uint8_t * buf, int len)
1698 {
1699 sessionidt s;
1700 sessiont *sp;
1701 tunnelidt t;
1702 in_addr_t ip;
1703 struct in6_addr ip6;
1704
1705 uint8_t *data = buf; // Keep a copy of the originals.
1706 int size = len;
1707
1708 uint8_t b[MAXETHER + 20];
1709
1710 CSTAT(processipv6out);
1711
1712 if (len < MIN_IP_SIZE)
1713 {
1714 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1715 STAT(tunnel_tx_errors);
1716 return;
1717 }
1718 if (len >= MAXETHER)
1719 {
1720 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1721 STAT(tunnel_tx_errors);
1722 return;
1723 }
1724
1725 // Skip the tun header
1726 buf += 4;
1727 len -= 4;
1728
1729 // Got an IP header now
1730 if (*(uint8_t *)(buf) >> 4 != 6)
1731 {
1732 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1733 return;
1734 }
1735
1736 ip6 = *(struct in6_addr *)(buf+24);
1737 s = sessionbyipv6(ip6);
1738
1739 if (s == 0)
1740 {
1741 ip = *(uint32_t *)(buf + 32);
1742 s = sessionbyip(ip);
1743 }
1744
1745 if (s == 0)
1746 {
1747 // Is this a packet for a session that doesn't exist?
1748 static int rate = 0; // Number of ICMP packets we've sent this second.
1749 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1750
1751 if (last != time_now)
1752 {
1753 last = time_now;
1754 rate = 0;
1755 }
1756
1757 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1758 {
1759 // FIXME: Should send icmp6 host unreachable
1760 }
1761 return;
1762 }
1763 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1764 {
1765 bundleidt bid = session[s].bundle;
1766 bundlet *b = &bundle[bid];
1767
1768 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1769 s = b->members[b->current_ses];
1770 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1771 }
1772 t = session[s].tunnel;
1773 sp = &session[s];
1774 sp->last_data = time_now;
1775
1776 // FIXME: add DoS prevention/filters?
1777
1778 if (sp->tbf_out)
1779 {
1780 // Are we throttling this session?
1781 if (config->cluster_iam_master)
1782 tbf_queue_packet(sp->tbf_out, data, size);
1783 else
1784 master_throttle_packet(sp->tbf_out, data, size);
1785 return;
1786 }
1787 else if (sp->walled_garden && !config->cluster_iam_master)
1788 {
1789 // We are walled-gardening this
1790 master_garden_packet(s, data, size);
1791 return;
1792 }
1793
1794 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1795
1796 // Add on L2TP header
1797 {
1798 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1799 if (!p) return;
1800 tunnelsend(b, len + (p-b), t); // send it...
1801 }
1802
1803 // Snooping this session, send it to intercept box
1804 if (sp->snoop_ip && sp->snoop_port)
1805 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1806
1807 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1808 sp->cout_delta += len;
1809 sp->pout++;
1810 udp_tx += len;
1811
1812 sess_local[s].cout += len; // To send to master..
1813 sess_local[s].pout++;
1814 }
1815
1816 //
1817 // Helper routine for the TBF filters.
1818 // Used to send queued data in to the user!
1819 //
1820 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1821 {
1822 sessiont *sp;
1823 tunnelidt t;
1824
1825 uint8_t b[MAXETHER + 20];
1826
1827 if (len < 0 || len > MAXETHER)
1828 {
1829 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1830 return;
1831 }
1832
1833 // Skip the tun header
1834 buf += 4;
1835 len -= 4;
1836
1837 if (!session[s].ip)
1838 return;
1839
1840 t = session[s].tunnel;
1841 sp = &session[s];
1842
1843 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1844
1845 // Add on L2TP header
1846 {
1847 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1848 if (!p) return;
1849 tunnelsend(b, len + (p-b), t); // send it...
1850 }
1851
1852 // Snooping this session.
1853 if (sp->snoop_ip && sp->snoop_port)
1854 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1855
1856 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1857 sp->cout_delta += len;
1858 sp->pout++;
1859 udp_tx += len;
1860
1861 sess_local[s].cout += len; // To send to master..
1862 sess_local[s].pout++;
1863 }
1864
1865 // add an AVP (16 bit)
1866 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1867 {
1868 uint16_t l = (m ? 0x8008 : 0x0008);
1869 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1870 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1871 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1872 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1873 c->length += 8;
1874 }
1875
1876 // add an AVP (32 bit)
1877 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1878 {
1879 uint16_t l = (m ? 0x800A : 0x000A);
1880 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1881 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1882 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1883 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1884 c->length += 10;
1885 }
1886
1887 // add an AVP (string)
1888 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1889 {
1890 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1891 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1892 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1893 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1894 memcpy(c->buf + c->length + 6, val, strlen(val));
1895 c->length += 6 + strlen(val);
1896 }
1897
1898 // add a binary AVP
1899 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1900 {
1901 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1902 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1903 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1904 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1905 memcpy(c->buf + c->length + 6, val, len);
1906 c->length += 6 + len;
1907 }
1908
1909 // new control connection
1910 static controlt *controlnew(uint16_t mtype)
1911 {
1912 controlt *c;
1913 if (!controlfree)
1914 c = malloc(sizeof(controlt));
1915 else
1916 {
1917 c = controlfree;
1918 controlfree = c->next;
1919 }
1920 assert(c);
1921 c->next = 0;
1922 c->buf[0] = 0xC8; // flags
1923 c->buf[1] = 0x02; // ver
1924 c->length = 12;
1925 control16(c, 0, mtype, 1);
1926 return c;
1927 }
1928
1929 // send zero block if nothing is waiting
1930 // (ZLB send).
1931 static void controlnull(tunnelidt t)
1932 {
1933 uint16_t buf[6];
1934 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1935 return;
1936
1937 buf[0] = htons(0xC802); // flags/ver
1938 buf[1] = htons(12); // length
1939 buf[2] = htons(tunnel[t].far); // tunnel
1940 buf[3] = htons(0); // session
1941 buf[4] = htons(tunnel[t].ns); // sequence
1942 buf[5] = htons(tunnel[t].nr); // sequence
1943 tunnelsend((uint8_t *)buf, 12, t);
1944 }
1945
1946 // add a control message to a tunnel, and send if within window
1947 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1948 {
1949 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1950 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1951 *(uint16_t *) (c->buf + 6) = htons(far); // session
1952 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1953 tunnel[t].ns++; // advance sequence
1954 // link in message in to queue
1955 if (tunnel[t].controlc)
1956 tunnel[t].controle->next = c;
1957 else
1958 tunnel[t].controls = c;
1959
1960 tunnel[t].controle = c;
1961 tunnel[t].controlc++;
1962
1963 // send now if space in window
1964 if (tunnel[t].controlc <= tunnel[t].window)
1965 {
1966 tunnel[t].try = 0; // first send
1967 tunnelsend(c->buf, c->length, t);
1968 }
1969 }
1970
1971 //
1972 // Throttle or Unthrottle a session
1973 //
1974 // Throttle the data from/to through a session to no more than
1975 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1976 // user).
1977 //
1978 // If either value is -1, the current value is retained for that
1979 // direction.
1980 //
1981 void throttle_session(sessionidt s, int rate_in, int rate_out)
1982 {
1983 if (!session[s].opened)
1984 return; // No-one home.
1985
1986 if (!*session[s].user)
1987 return; // User not logged in
1988
1989 if (rate_in >= 0)
1990 {
1991 int bytes = rate_in * 1024 / 8; // kbits to bytes
1992 if (session[s].tbf_in)
1993 free_tbf(session[s].tbf_in);
1994
1995 if (rate_in > 0)
1996 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1997 else
1998 session[s].tbf_in = 0;
1999
2000 session[s].throttle_in = rate_in;
2001 }
2002
2003 if (rate_out >= 0)
2004 {
2005 int bytes = rate_out * 1024 / 8;
2006 if (session[s].tbf_out)
2007 free_tbf(session[s].tbf_out);
2008
2009 if (rate_out > 0)
2010 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
2011 else
2012 session[s].tbf_out = 0;
2013
2014 session[s].throttle_out = rate_out;
2015 }
2016 }
2017
2018 // add/remove filters from session (-1 = no change)
2019 void filter_session(sessionidt s, int filter_in, int filter_out)
2020 {
2021 if (!session[s].opened)
2022 return; // No-one home.
2023
2024 if (!*session[s].user)
2025 return; // User not logged in
2026
2027 // paranoia
2028 if (filter_in > MAXFILTER) filter_in = -1;
2029 if (filter_out > MAXFILTER) filter_out = -1;
2030 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2031 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2032
2033 if (filter_in >= 0)
2034 {
2035 if (session[s].filter_in)
2036 ip_filters[session[s].filter_in - 1].used--;
2037
2038 if (filter_in > 0)
2039 ip_filters[filter_in - 1].used++;
2040
2041 session[s].filter_in = filter_in;
2042 }
2043
2044 if (filter_out >= 0)
2045 {
2046 if (session[s].filter_out)
2047 ip_filters[session[s].filter_out - 1].used--;
2048
2049 if (filter_out > 0)
2050 ip_filters[filter_out - 1].used++;
2051
2052 session[s].filter_out = filter_out;
2053 }
2054 }
2055
2056 // start tidy shutdown of session
2057 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2058 {
2059 int walled_garden = session[s].walled_garden;
2060 bundleidt b = session[s].bundle;
2061 //delete routes only for last session in bundle (in case of MPPP)
2062 int del_routes = !b || (bundle[b].num_of_links == 1);
2063
2064 CSTAT(sessionshutdown);
2065
2066 if (!session[s].opened)
2067 {
2068 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2069 return; // not a live session
2070 }
2071
2072 if (!session[s].die)
2073 {
2074 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2075 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2076 run_plugins(PLUGIN_KILL_SESSION, &data);
2077 }
2078
2079 if (session[s].ip && !walled_garden && !session[s].die)
2080 {
2081 // RADIUS Stop message
2082 uint16_t r = radiusnew(s);
2083 if (r)
2084 {
2085 // stop, if not already trying
2086 if (radius[r].state != RADIUSSTOP)
2087 {
2088 radius[r].term_cause = term_cause;
2089 radius[r].term_msg = reason;
2090 radiussend(r, RADIUSSTOP);
2091 }
2092 }
2093 else
2094 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2095
2096 // Save counters to dump to accounting file
2097 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2098 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2099 }
2100
2101 if (!session[s].die)
2102 session[s].die = TIME + 150; // Clean up in 15 seconds
2103
2104 if (session[s].ip)
2105 { // IP allocated, clear and unroute
2106 int r;
2107 int routed = 0;
2108 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2109 {
2110 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2111 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2112 routed++;
2113
2114 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2115 session[s].route[r].ip = 0;
2116 }
2117
2118 if (session[s].ip_pool_index == -1) // static ip
2119 {
2120 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2121 session[s].ip = 0;
2122 }
2123 else
2124 free_ip_address(s);
2125
2126 // unroute IPv6, if setup
2127 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2128 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2129
2130 if (b)
2131 {
2132 // This session was part of a bundle
2133 bundle[b].num_of_links--;
2134 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2135 if(bundle[b].num_of_links == 0)
2136 {
2137 bundleclear(b);
2138 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2139 }
2140 else
2141 {
2142 // Adjust the members array to accomodate the new change
2143 uint8_t mem_num = 0;
2144 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2145 if(bundle[b].members[bundle[b].num_of_links] != s)
2146 {
2147 uint8_t ml;
2148 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2149 if(bundle[b].members[ml] == s)
2150 {
2151 mem_num = ml;
2152 break;
2153 }
2154 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2155 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2156
2157 // If the killed session is the first of the bundle,
2158 // the new first session must be stored in the cache_ipmap
2159 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2160 if (mem_num == 0)
2161 {
2162 sessionidt new_s = bundle[b].members[0];
2163
2164 routed = 0;
2165 // Add the route for this session.
2166 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2167 {
2168 int i, prefixlen;
2169 in_addr_t ip;
2170
2171 prefixlen = session[new_s].route[r].prefixlen;
2172 ip = session[new_s].route[r].ip;
2173
2174 if (!prefixlen) prefixlen = 32;
2175 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2176
2177 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2178 cache_ipmap(i, new_s);
2179 }
2180 cache_ipmap(session[new_s].ip, new_s);
2181
2182 // IPV6 route
2183 if (session[new_s].ipv6prefixlen)
2184 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2185 }
2186 }
2187 }
2188
2189 cluster_send_bundle(b);
2190 }
2191 }
2192
2193 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2194 throttle_session(s, 0, 0);
2195
2196 if (cdn_result)
2197 {
2198 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2199 {
2200 pppoe_shutdown_session(s);
2201 }
2202 else
2203 {
2204 // Send CDN
2205 controlt *c = controlnew(14); // sending CDN
2206 if (cdn_error)
2207 {
2208 uint16_t buf[2];
2209 buf[0] = htons(cdn_result);
2210 buf[1] = htons(cdn_error);
2211 controlb(c, 1, (uint8_t *)buf, 4, 1);
2212 }
2213 else
2214 control16(c, 1, cdn_result, 1);
2215
2216 control16(c, 14, s, 1); // assigned session (our end)
2217 controladd(c, session[s].far, session[s].tunnel); // send the message
2218 }
2219 }
2220
2221 // update filter refcounts
2222 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2223 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2224
2225 // clear PPP state
2226 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2227 sess_local[s].lcp.restart = 0;
2228 sess_local[s].ipcp.restart = 0;
2229 sess_local[s].ipv6cp.restart = 0;
2230 sess_local[s].ccp.restart = 0;
2231
2232 cluster_send_session(s);
2233 }
2234
2235 void sendipcp(sessionidt s, tunnelidt t)
2236 {
2237 uint8_t buf[MAXETHER];
2238 uint8_t *q;
2239
2240 CSTAT(sendipcp);
2241 LOG(3, s, t, "IPCP: send ConfigReq\n");
2242
2243 if (!session[s].unique_id)
2244 {
2245 if (!++last_id) ++last_id; // skip zero
2246 session[s].unique_id = last_id;
2247 }
2248
2249 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2250 if (!q) return;
2251
2252 *q = ConfigReq;
2253 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2254 *(uint16_t *) (q + 2) = htons(10); // packet length
2255 q[4] = 3; // ip address option
2256 q[5] = 6; // option length
2257 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2258 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2259 my_address; // send my IP
2260
2261 tunnelsend(buf, 10 + (q - buf), t); // send it
2262 restart_timer(s, ipcp);
2263 }
2264
2265 void sendipv6cp(sessionidt s, tunnelidt t)
2266 {
2267 uint8_t buf[MAXETHER];
2268 uint8_t *q;
2269
2270 CSTAT(sendipv6cp);
2271 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2272
2273 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2274 if (!q) return;
2275
2276 *q = ConfigReq;
2277 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2278 // only send one type
2279 // of request
2280 *(uint16_t *) (q + 2) = htons(14);
2281 q[4] = 1; // interface identifier option
2282 q[5] = 10; // option length
2283 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2284 *(uint32_t *) (q + 10) = 0;
2285 q[13] = 1;
2286
2287 tunnelsend(buf, 14 + (q - buf), t); // send it
2288 restart_timer(s, ipv6cp);
2289 }
2290
2291 static void sessionclear(sessionidt s)
2292 {
2293 memset(&session[s], 0, sizeof(session[s]));
2294 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2295 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2296
2297 session[s].tunnel = T_FREE; // Mark it as free.
2298 session[s].next = sessionfree;
2299 sessionfree = s;
2300 }
2301
2302 // kill a session now
2303 void sessionkill(sessionidt s, char *reason)
2304 {
2305 groupidt g;
2306
2307 CSTAT(sessionkill);
2308
2309 if (!session[s].opened) // not alive
2310 return;
2311
2312 if (session[s].next)
2313 {
2314 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2315 return;
2316 }
2317
2318 if (!session[s].die)
2319 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2320
2321 if (sess_local[s].radius)
2322 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2323
2324 if (session[s].forwardtosession)
2325 {
2326 sessionidt sess = session[s].forwardtosession;
2327 if (session[sess].forwardtosession == s)
2328 {
2329 // Shutdown the linked session also.
2330 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2331 }
2332 }
2333
2334 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2335
2336 if ((g = grp_groupbysession(s)))
2337 {
2338 grp_removesession(g, s);
2339 }
2340
2341 sessionclear(s);
2342 cluster_send_session(s);
2343 }
2344
2345 static void tunnelclear(tunnelidt t)
2346 {
2347 if (!t) return;
2348 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2349 tunnel[t].state = TUNNELFREE;
2350 }
2351
2352 static void bundleclear(bundleidt b)
2353 {
2354 if (!b) return;
2355 memset(&bundle[b], 0, sizeof(bundle[b]));
2356 bundle[b].state = BUNDLEFREE;
2357 }
2358
2359 // kill a tunnel now
2360 static void tunnelkill(tunnelidt t, char *reason)
2361 {
2362 sessionidt s;
2363 controlt *c;
2364
2365 CSTAT(tunnelkill);
2366
2367 tunnel[t].state = TUNNELDIE;
2368
2369 // free control messages
2370 while ((c = tunnel[t].controls))
2371 {
2372 controlt * n = c->next;
2373 tunnel[t].controls = n;
2374 tunnel[t].controlc--;
2375 c->next = controlfree;
2376 controlfree = c;
2377 }
2378 // kill sessions
2379 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2380 if (session[s].tunnel == t)
2381 sessionkill(s, reason);
2382
2383 // free tunnel
2384 tunnelclear(t);
2385 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2386 cli_tunnel_actions[t].action = 0;
2387 cluster_send_tunnel(t);
2388 }
2389
2390 // shut down a tunnel cleanly
2391 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2392 {
2393 sessionidt s;
2394
2395 CSTAT(tunnelshutdown);
2396
2397 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2398 {
2399 // never set up, can immediately kill
2400 tunnelkill(t, reason);
2401 return;
2402 }
2403 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2404
2405 // close session
2406 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2407 if (session[s].tunnel == t)
2408 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2409
2410 tunnel[t].state = TUNNELDIE;
2411 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2412 cluster_send_tunnel(t);
2413 // TBA - should we wait for sessions to stop?
2414 if (result)
2415 {
2416 controlt *c = controlnew(4); // sending StopCCN
2417 if (error)
2418 {
2419 uint16_t buf[32];
2420 int l = 4;
2421 buf[0] = htons(result);
2422 buf[1] = htons(error);
2423 if (msg)
2424 {
2425 int m = strlen(msg);
2426 if (m + 4 > sizeof(buf))
2427 m = sizeof(buf) - 4;
2428
2429 memcpy(buf+2, msg, m);
2430 l += m;
2431 }
2432
2433 controlb(c, 1, (uint8_t *)buf, l, 1);
2434 }
2435 else
2436 control16(c, 1, result, 1);
2437
2438 control16(c, 9, t, 1); // assigned tunnel (our end)
2439 controladd(c, 0, t); // send the message
2440 }
2441 }
2442
2443 // read and process packet on tunnel (UDP)
2444 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2445 {
2446 uint8_t *sendchalresponse = NULL;
2447 uint8_t *recvchalresponse = NULL;
2448 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2449 uint8_t *p = buf + 2;
2450
2451
2452 CSTAT(processudp);
2453
2454 udp_rx += len;
2455 udp_rx_pkt++;
2456 LOG_HEX(5, "UDP Data", buf, len);
2457 STAT(tunnel_rx_packets);
2458 INC_STAT(tunnel_rx_bytes, len);
2459 if (len < 6)
2460 {
2461 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2462 STAT(tunnel_rx_errors);
2463 return;
2464 }
2465 if ((buf[1] & 0x0F) != 2)
2466 {
2467 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2468 STAT(tunnel_rx_errors);
2469 return;
2470 }
2471 if (*buf & 0x40)
2472 { // length
2473 l = ntohs(*(uint16_t *) p);
2474 p += 2;
2475 }
2476 t = ntohs(*(uint16_t *) p);
2477 p += 2;
2478 s = ntohs(*(uint16_t *) p);
2479 p += 2;
2480 if (s >= MAXSESSION)
2481 {
2482 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2483 STAT(tunnel_rx_errors);
2484 return;
2485 }
2486 if (t >= MAXTUNNEL)
2487 {
2488 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2489 STAT(tunnel_rx_errors);
2490 return;
2491 }
2492 if (t == TUNNEL_ID_PPPOE)
2493 {
2494 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2495 STAT(tunnel_rx_errors);
2496 return;
2497 }
2498 if (*buf & 0x08)
2499 { // ns/nr
2500 ns = ntohs(*(uint16_t *) p);
2501 p += 2;
2502 nr = ntohs(*(uint16_t *) p);
2503 p += 2;
2504 }
2505 if (*buf & 0x02)
2506 { // offset
2507 uint16_t o = ntohs(*(uint16_t *) p);
2508 p += o + 2;
2509 }
2510 if ((p - buf) > l)
2511 {
2512 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2513 STAT(tunnel_rx_errors);
2514 return;
2515 }
2516 l -= (p - buf);
2517
2518 // used to time out old tunnels
2519 if (t && tunnel[t].state == TUNNELOPEN)
2520 tunnel[t].lastrec = time_now;
2521
2522 if (*buf & 0x80)
2523 { // control
2524 uint16_t message = 0xFFFF; // message type
2525 uint8_t fatal = 0;
2526 uint8_t mandatory = 0;
2527 uint16_t asession = 0; // assigned session
2528 uint32_t amagic = 0; // magic number
2529 uint8_t aflags = 0; // flags from last LCF
2530 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2531 char called[MAXTEL] = ""; // called number
2532 char calling[MAXTEL] = ""; // calling number
2533
2534 if (!config->cluster_iam_master)
2535 {
2536 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2537 return;
2538 }
2539
2540 // control messages must have bits 0x80|0x40|0x08
2541 // (type, length and sequence) set, and bits 0x02|0x01
2542 // (offset and priority) clear
2543 if ((*buf & 0xCB) != 0xC8)
2544 {
2545 LOG(1, s, t, "Bad control header %02X\n", *buf);
2546 STAT(tunnel_rx_errors);
2547 return;
2548 }
2549
2550 // check for duplicate tunnel open message
2551 if (!t && ns == 0)
2552 {
2553 int i;
2554
2555 //
2556 // Is this a duplicate of the first packet? (SCCRQ)
2557 //
2558 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2559 {
2560 if (tunnel[i].state != TUNNELOPENING ||
2561 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2562 tunnel[i].port != ntohs(addr->sin_port) )
2563 continue;
2564 t = i;
2565 LOG(3, s, t, "Duplicate SCCRQ?\n");
2566 break;
2567 }
2568 }
2569
2570 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2571 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2572
2573 // if no tunnel specified, assign one
2574 if (!t)
2575 {
2576 if (!(t = new_tunnel()))
2577 {
2578 LOG(1, 0, 0, "No more tunnels\n");
2579 STAT(tunnel_overflow);
2580 return;
2581 }
2582 tunnelclear(t);
2583 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2584 tunnel[t].port = ntohs(addr->sin_port);
2585 tunnel[t].window = 4; // default window
2586 tunnel[t].indexudp = indexudpfd;
2587 STAT(tunnel_created);
2588 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2589 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2590 }
2591
2592 // If the 'ns' just received is not the 'nr' we're
2593 // expecting, just send an ack and drop it.
2594 //
2595 // if 'ns' is less, then we got a retransmitted packet.
2596 // if 'ns' is greater than missed a packet. Either way
2597 // we should ignore it.
2598 if (ns != tunnel[t].nr)
2599 {
2600 // is this the sequence we were expecting?
2601 STAT(tunnel_rx_errors);
2602 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2603 t, ns, tunnel[t].nr);
2604
2605 if (l) // Is this not a ZLB?
2606 controlnull(t);
2607 return;
2608 }
2609
2610 // check sequence of this message
2611 {
2612 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2613 // some to clear maybe?
2614 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2615 {
2616 controlt *c = tunnel[t].controls;
2617 tunnel[t].controls = c->next;
2618 tunnel[t].controlc--;
2619 c->next = controlfree;
2620 controlfree = c;
2621 skip--;
2622 tunnel[t].try = 0; // we have progress
2623 }
2624
2625 // receiver advance (do here so quoted correctly in any sends below)
2626 if (l) tunnel[t].nr = (ns + 1);
2627 if (skip < 0) skip = 0;
2628 if (skip < tunnel[t].controlc)
2629 {
2630 // some control packets can now be sent that were previous stuck out of window
2631 int tosend = tunnel[t].window - skip;
2632 controlt *c = tunnel[t].controls;
2633 while (c && skip)
2634 {
2635 c = c->next;
2636 skip--;
2637 }
2638 while (c && tosend)
2639 {
2640 tunnel[t].try = 0; // first send
2641 tunnelsend(c->buf, c->length, t);
2642 c = c->next;
2643 tosend--;
2644 }
2645 }
2646 if (!tunnel[t].controlc)
2647 tunnel[t].retry = 0; // caught up
2648 }
2649 if (l)
2650 { // if not a null message
2651 int result = 0;
2652 int error = 0;
2653 char *msg = 0;
2654
2655 // Default disconnect cause/message on receipt of CDN. Set to
2656 // more specific value from attribute 1 (result code) or 46
2657 // (disconnect cause) if present below.
2658 int disc_cause_set = 0;
2659 int disc_cause = TERM_NAS_REQUEST;
2660 char const *disc_reason = "Closed (Received CDN).";
2661
2662 // process AVPs
2663 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2664 {
2665 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2666 uint8_t *b = p;
2667 uint8_t flags = *p;
2668 uint16_t mtype;
2669
2670 if (n > l)
2671 {
2672 LOG(1, s, t, "Invalid length in AVP\n");
2673 STAT(tunnel_rx_errors);
2674 return;
2675 }
2676 p += n; // next
2677 l -= n;
2678 if (flags & 0x3C) // reserved bits, should be clear
2679 {
2680 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2681 fatal = flags;
2682 result = 2; // general error
2683 error = 3; // reserved field non-zero
2684 msg = 0;
2685 continue; // next
2686 }
2687 b += 2;
2688 if (*(uint16_t *) (b))
2689 {
2690 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2691 fatal = flags;
2692 result = 2; // general error
2693 error = 6; // generic vendor-specific error
2694 msg = "unsupported vendor-specific";
2695 continue; // next
2696 }
2697 b += 2;
2698 mtype = ntohs(*(uint16_t *) (b));
2699 b += 2;
2700 n -= 6;
2701
2702 if (flags & 0x40)
2703 {
2704 uint16_t orig_len;
2705
2706 // handle hidden AVPs
2707 if (!*config->l2tp_secret)
2708 {
2709 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2710 fatal = flags;
2711 result = 2; // general error
2712 error = 6; // generic vendor-specific error
2713 msg = "secret not specified";
2714 continue;
2715 }
2716 if (!session[s].random_vector_length)
2717 {
2718 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2719 fatal = flags;
2720 result = 2; // general error
2721 error = 6; // generic
2722 msg = "no random vector";
2723 continue;
2724 }
2725 if (n < 8)
2726 {
2727 LOG(2, s, t, "Short hidden AVP.\n");
2728 fatal = flags;
2729 result = 2; // general error
2730 error = 2; // length is wrong
2731 msg = 0;
2732 continue;
2733 }
2734
2735 // Unhide the AVP
2736 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2737
2738 orig_len = ntohs(*(uint16_t *) b);
2739 if (orig_len > n + 2)
2740 {
2741 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2742 orig_len, n);
2743
2744 fatal = flags;
2745 result = 2; // general error
2746 error = 2; // length is wrong
2747 msg = 0;
2748 continue;
2749 }
2750
2751 b += 2;
2752 n = orig_len;
2753 }
2754
2755 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2756 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2757
2758 switch (mtype)
2759 {
2760 case 0: // message type
2761 message = ntohs(*(uint16_t *) b);
2762 mandatory = flags & 0x80;
2763 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2764 break;
2765 case 1: // result code
2766 {
2767 uint16_t rescode = ntohs(*(uint16_t *) b);
2768 char const *resdesc = "(unknown)";
2769 char const *errdesc = NULL;
2770 int cause = 0;
2771
2772 if (message == 4)
2773 { /* StopCCN */
2774 resdesc = l2tp_stopccn_result_code(rescode);
2775 cause = TERM_LOST_SERVICE;
2776 }
2777 else if (message == 14)
2778 { /* CDN */
2779 resdesc = l2tp_cdn_result_code(rescode);
2780 if (rescode == 1)
2781 cause = TERM_LOST_CARRIER;
2782 else
2783 cause = TERM_ADMIN_RESET;
2784 }
2785
2786 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2787 if (n >= 4)
2788 {
2789 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2790 errdesc = l2tp_error_code(errcode);
2791 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2792 }
2793 if (n > 4)
2794 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2795
2796 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2797 {
2798 disc_cause_set = mtype;
2799 disc_reason = errdesc ? errdesc : resdesc;
2800 disc_cause = cause;
2801 }
2802
2803 break;
2804 }
2805 break;
2806 case 2: // protocol version
2807 {
2808 version = ntohs(*(uint16_t *) (b));
2809 LOG(4, s, t, " Protocol version = %u\n", version);
2810 if (version && version != 0x0100)
2811 { // allow 0.0 and 1.0
2812 LOG(1, s, t, " Bad protocol version %04X\n", version);
2813 fatal = flags;
2814 result = 5; // unspported protocol version
2815 error = 0x0100; // supported version
2816 msg = 0;
2817 continue; // next
2818 }
2819 }
2820 break;
2821 case 3: // framing capabilities
2822 break;
2823 case 4: // bearer capabilities
2824 break;
2825 case 5: // tie breaker
2826 // We never open tunnels, so we don't care about tie breakers
2827 continue;
2828 case 6: // firmware revision
2829 break;
2830 case 7: // host name
2831 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2832 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2833 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2834 // TBA - to send to RADIUS
2835 break;
2836 case 8: // vendor name
2837 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2838 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2839 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2840 break;
2841 case 9: // assigned tunnel
2842 tunnel[t].far = ntohs(*(uint16_t *) (b));
2843 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2844 break;
2845 case 10: // rx window
2846 tunnel[t].window = ntohs(*(uint16_t *) (b));
2847 if (!tunnel[t].window)
2848 tunnel[t].window = 1; // window of 0 is silly
2849 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2850 break;
2851 case 11: // Request Challenge
2852 {
2853 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2854 if (message == 1)
2855 build_chap_response(b, 2, n, &sendchalresponse);
2856 else if (message == 2)
2857 build_chap_response(b, 3, n, &sendchalresponse);
2858 }
2859 break;
2860 case 13: // receive challenge Response
2861 if (tunnel[t].isremotelns)
2862 {
2863 recvchalresponse = calloc(17, 1);
2864 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2865 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2866 }
2867 else
2868 // Why did they send a response? We never challenge.
2869 LOG(2, s, t, " received unexpected challenge response\n");
2870 break;
2871
2872 case 14: // assigned session
2873 asession = session[s].far = ntohs(*(uint16_t *) (b));
2874 LOG(4, s, t, " assigned session = %u\n", asession);
2875 break;
2876 case 15: // call serial number
2877 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2878 break;
2879 case 18: // bearer type
2880 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2881 // TBA - for RADIUS
2882 break;
2883 case 19: // framing type
2884 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2885 // TBA
2886 break;
2887 case 21: // called number
2888 memset(called, 0, sizeof(called));
2889 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2890 LOG(4, s, t, " Called <%s>\n", called);
2891 break;
2892 case 22: // calling number
2893 memset(calling, 0, sizeof(calling));
2894 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2895 LOG(4, s, t, " Calling <%s>\n", calling);
2896 break;
2897 case 23: // subtype
2898 break;
2899 case 24: // tx connect speed
2900 if (n == 4)
2901 {
2902 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2903 }
2904 else
2905 {
2906 // AS5300s send connect speed as a string
2907 char tmp[30];
2908 memset(tmp, 0, sizeof(tmp));
2909 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2910 session[s].tx_connect_speed = atol(tmp);
2911 }
2912 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2913 break;
2914 case 38: // rx connect speed
2915 if (n == 4)
2916 {
2917 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2918 }
2919 else
2920 {
2921 // AS5300s send connect speed as a string
2922 char tmp[30];
2923 memset(tmp, 0, sizeof(tmp));
2924 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2925 session[s].rx_connect_speed = atol(tmp);
2926 }
2927 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2928 break;
2929 case 25: // Physical Channel ID
2930 {
2931 uint32_t tmp = ntohl(*(uint32_t *) b);
2932 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2933 break;
2934 }
2935 case 29: // Proxy Authentication Type
2936 {
2937 uint16_t atype = ntohs(*(uint16_t *)b);
2938 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2939 break;
2940 }
2941 case 30: // Proxy Authentication Name
2942 {
2943 char authname[64];
2944 memset(authname, 0, sizeof(authname));
2945 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2946 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2947 authname);
2948 break;
2949 }
2950 case 31: // Proxy Authentication Challenge
2951 {
2952 LOG(4, s, t, " Proxy Auth Challenge\n");
2953 break;
2954 }
2955 case 32: // Proxy Authentication ID
2956 {
2957 uint16_t authid = ntohs(*(uint16_t *)(b));
2958 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2959 break;
2960 }
2961 case 33: // Proxy Authentication Response
2962 LOG(4, s, t, " Proxy Auth Response\n");
2963 break;
2964 case 27: // last sent lcp
2965 { // find magic number
2966 uint8_t *p = b, *e = p + n;
2967 while (p + 1 < e && p[1] && p + p[1] <= e)
2968 {
2969 if (*p == 5 && p[1] == 6) // Magic-Number
2970 amagic = ntohl(*(uint32_t *) (p + 2));
2971 else if (*p == 7) // Protocol-Field-Compression
2972 aflags |= SESSION_PFC;
2973 else if (*p == 8) // Address-and-Control-Field-Compression
2974 aflags |= SESSION_ACFC;
2975 p += p[1];
2976 }
2977 }
2978 break;
2979 case 28: // last recv lcp confreq
2980 break;
2981 case 26: // Initial Received LCP CONFREQ
2982 break;
2983 case 39: // seq required - we control it as an LNS anyway...
2984 break;
2985 case 36: // Random Vector
2986 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2987 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2988 if (n > sizeof(session[s].random_vector))
2989 n = sizeof(session[s].random_vector);
2990 memcpy(session[s].random_vector, b, n);
2991 session[s].random_vector_length = n;
2992 break;
2993 case 46: // ppp disconnect cause
2994 if (n >= 5)
2995 {
2996 uint16_t code = ntohs(*(uint16_t *) b);
2997 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2998 uint8_t dir = *(b + 4);
2999
3000 LOG(4, s, t, " PPP disconnect cause "
3001 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3002 code, proto, dir, n - 5, b + 5);
3003
3004 disc_cause_set = mtype;
3005
3006 switch (code)
3007 {
3008 case 1: // admin disconnect
3009 disc_cause = TERM_ADMIN_RESET;
3010 disc_reason = "Administrative disconnect";
3011 break;
3012 case 3: // lcp terminate
3013 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
3014 disc_cause = TERM_USER_REQUEST;
3015 disc_reason = "Normal disconnection";
3016 break;
3017 case 4: // compulsory encryption unavailable
3018 if (dir != 1) break; // 1=refused by peer, 2=local
3019 disc_cause = TERM_USER_ERROR;
3020 disc_reason = "Compulsory encryption refused";
3021 break;
3022 case 5: // lcp: fsm timeout
3023 disc_cause = TERM_PORT_ERROR;
3024 disc_reason = "LCP: FSM timeout";
3025 break;
3026 case 6: // lcp: no recognisable lcp packets received
3027 disc_cause = TERM_PORT_ERROR;
3028 disc_reason = "LCP: no recognisable LCP packets";
3029 break;
3030 case 7: // lcp: magic-no error (possibly looped back)
3031 disc_cause = TERM_PORT_ERROR;
3032 disc_reason = "LCP: magic-no error (possible loop)";
3033 break;
3034 case 8: // lcp: echo request timeout
3035 disc_cause = TERM_PORT_ERROR;
3036 disc_reason = "LCP: echo request timeout";
3037 break;
3038 case 13: // auth: fsm timeout
3039 disc_cause = TERM_SERVICE_UNAVAILABLE;
3040 disc_reason = "Authentication: FSM timeout";
3041 break;
3042 case 15: // auth: unacceptable auth protocol
3043 disc_cause = TERM_SERVICE_UNAVAILABLE;
3044 disc_reason = "Unacceptable authentication protocol";
3045 break;
3046 case 16: // auth: authentication failed
3047 disc_cause = TERM_SERVICE_UNAVAILABLE;
3048 disc_reason = "Authentication failed";
3049 break;
3050 case 17: // ncp: fsm timeout
3051 disc_cause = TERM_SERVICE_UNAVAILABLE;
3052 disc_reason = "NCP: FSM timeout";
3053 break;
3054 case 18: // ncp: no ncps available
3055 disc_cause = TERM_SERVICE_UNAVAILABLE;
3056 disc_reason = "NCP: no NCPs available";
3057 break;
3058 case 19: // ncp: failure to converge on acceptable address
3059 disc_cause = TERM_SERVICE_UNAVAILABLE;
3060 disc_reason = (dir == 1)
3061 ? "NCP: too many Configure-Naks received from peer"
3062 : "NCP: too many Configure-Naks sent to peer";
3063 break;
3064 case 20: // ncp: user not permitted to use any address
3065 disc_cause = TERM_SERVICE_UNAVAILABLE;
3066 disc_reason = (dir == 1)
3067 ? "NCP: local link address not acceptable to peer"
3068 : "NCP: remote link address not acceptable";
3069 break;
3070 }
3071 }
3072 break;
3073 default:
3074 {
3075 static char e[] = "unknown AVP 0xXXXX";
3076 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3077 fatal = flags;
3078 result = 2; // general error
3079 error = 8; // unknown mandatory AVP
3080 sprintf((msg = e) + 14, "%04x", mtype);
3081 continue; // next
3082 }
3083 }
3084 }
3085 // process message
3086 if (fatal & 0x80)
3087 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3088 else
3089 switch (message)
3090 {
3091 case 1: // SCCRQ - Start Control Connection Request
3092 tunnel[t].state = TUNNELOPENING;
3093 LOG(3, s, t, "Received SCCRQ\n");
3094 if (main_quit != QUIT_SHUTDOWN)
3095 {
3096 LOG(3, s, t, "sending SCCRP\n");
3097 controlt *c = controlnew(2); // sending SCCRP
3098 control16(c, 2, version, 1); // protocol version
3099 control32(c, 3, 3, 1); // framing
3100 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3101 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3102 control16(c, 9, t, 1); // assigned tunnel
3103 controladd(c, 0, t); // send the resply
3104 }
3105 else
3106 {
3107 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3108 }
3109 break;
3110 case 2: // SCCRP
3111 tunnel[t].state = TUNNELOPEN;
3112 tunnel[t].lastrec = time_now;
3113 LOG(3, s, t, "Received SCCRP\n");
3114 if (main_quit != QUIT_SHUTDOWN)
3115 {
3116 if (tunnel[t].isremotelns && recvchalresponse)
3117 {
3118 hasht hash;
3119
3120 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3121 // check authenticator
3122 if (memcmp(hash, recvchalresponse, 16) == 0)
3123 {
3124 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3125 controlt *c = controlnew(3); // sending SCCCN
3126 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3127 controls(c, 8, Vendor_name, 1); // Vendor name
3128 control16(c, 2, version, 1); // protocol version
3129 control32(c, 3, 3, 1); // framing Capabilities
3130 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3131 control16(c, 9, t, 1); // assigned tunnel
3132 controladd(c, 0, t); // send
3133 }
3134 else
3135 {
3136 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3137 }
3138 }
3139 }
3140 else
3141 {
3142 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3143 }
3144 break;
3145 case 3: // SCCN
3146 LOG(3, s, t, "Received SCCN\n");
3147 tunnel[t].state = TUNNELOPEN;
3148 tunnel[t].lastrec = time_now;
3149 controlnull(t); // ack
3150 break;
3151 case 4: // StopCCN
3152 LOG(3, s, t, "Received StopCCN\n");
3153 controlnull(t); // ack
3154 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3155 break;
3156 case 6: // HELLO
3157 LOG(3, s, t, "Received HELLO\n");
3158 controlnull(t); // simply ACK
3159 break;
3160 case 7: // OCRQ
3161 // TBA
3162 LOG(3, s, t, "Received OCRQ\n");
3163 break;
3164 case 8: // OCRO
3165 // TBA
3166 LOG(3, s, t, "Received OCRO\n");
3167 break;
3168 case 9: // OCCN
3169 // TBA
3170 LOG(3, s, t, "Received OCCN\n");
3171 break;
3172 case 10: // ICRQ
3173 LOG(3, s, t, "Received ICRQ\n");
3174 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3175 {
3176 controlt *c = controlnew(11); // ICRP
3177
3178 LOG(3, s, t, "Sending ICRP\n");
3179
3180 s = sessionfree;
3181 sessionfree = session[s].next;
3182 memset(&session[s], 0, sizeof(session[s]));
3183
3184 if (s > config->cluster_highest_sessionid)
3185 config->cluster_highest_sessionid = s;
3186
3187 session[s].opened = time_now;
3188 session[s].tunnel = t;
3189 session[s].far = asession;
3190 session[s].last_packet = session[s].last_data = time_now;
3191 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3192 control16(c, 14, s, 1); // assigned session
3193 controladd(c, asession, t); // send the reply
3194
3195 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3196 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3197
3198 session[s].ppp.phase = Establish;
3199 session[s].ppp.lcp = Starting;
3200
3201 STAT(session_created);
3202 break;
3203 }
3204
3205 {
3206 controlt *c = controlnew(14); // CDN
3207 LOG(3, s, t, "Sending CDN\n");
3208 if (!sessionfree)
3209 {
3210 STAT(session_overflow);
3211 LOG(1, 0, t, "No free sessions\n");
3212 control16(c, 1, 4, 0); // temporary lack of resources
3213 }
3214 else
3215 control16(c, 1, 2, 7); // shutting down, try another
3216
3217 controladd(c, asession, t); // send the message
3218 }
3219 return;
3220 case 11: // ICRP
3221 LOG(3, s, t, "Received ICRP\n");
3222 if (session[s].forwardtosession)
3223 {
3224 controlt *c = controlnew(12); // ICCN
3225
3226 session[s].opened = time_now;
3227 session[s].tunnel = t;
3228 session[s].far = asession;
3229 session[s].last_packet = session[s].last_data = time_now;
3230
3231 control32(c, 19, 1, 1); // Framing Type
3232 control32(c, 24, 10000000, 1); // Tx Connect Speed
3233 controladd(c, asession, t); // send the message
3234 LOG(3, s, t, "Sending ICCN\n");
3235 }
3236 break;
3237 case 12: // ICCN
3238 LOG(3, s, t, "Received ICCN\n");
3239 if (amagic == 0) amagic = time_now;
3240 session[s].magic = amagic; // set magic number
3241 session[s].flags = aflags; // set flags received
3242 session[s].mru = PPPoE_MRU; // default
3243 controlnull(t); // ack
3244
3245 // start LCP
3246 sess_local[s].lcp_authtype = config->radius_authprefer;
3247 sess_local[s].ppp_mru = MRU;
3248
3249 // Set multilink options before sending initial LCP packet
3250 sess_local[s].mp_mrru = 1614;
3251 sess_local[s].mp_epdis = ntohl(config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] : my_address);
3252
3253 sendlcp(s, t);
3254 change_state(s, lcp, RequestSent);
3255 break;
3256
3257 case 14: // CDN
3258 LOG(3, s, t, "Received CDN\n");
3259 controlnull(t); // ack
3260 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3261 break;
3262 case 0xFFFF:
3263 LOG(1, s, t, "Missing message type\n");
3264 break;
3265 default:
3266 STAT(tunnel_rx_errors);
3267 if (mandatory)
3268 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3269 else
3270 LOG(1, s, t, "Unknown message type %u\n", message);
3271 break;
3272 }
3273 if (sendchalresponse) free(sendchalresponse);
3274 if (recvchalresponse) free(recvchalresponse);
3275 cluster_send_tunnel(t);
3276 }
3277 else
3278 {
3279 LOG(4, s, t, " Got a ZLB ack\n");
3280 }
3281 }
3282 else
3283 { // data
3284 uint16_t proto;
3285
3286 LOG_HEX(5, "Receive Tunnel Data", p, l);
3287 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3288 { // HDLC address header, discard
3289 p += 2;
3290 l -= 2;
3291 }
3292 if (l < 2)
3293 {
3294 LOG(1, s, t, "Short ppp length %d\n", l);
3295 STAT(tunnel_rx_errors);
3296 return;
3297 }
3298 if (*p & 1)
3299 {
3300 proto = *p++;
3301 l--;
3302 }
3303 else
3304 {
3305 proto = ntohs(*(uint16_t *) p);
3306 p += 2;
3307 l -= 2;
3308 }
3309
3310 if (session[s].forwardtosession)
3311 {
3312 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3313 // Forward to LAC/BAS or Remote LNS session
3314 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3315 return;
3316 }
3317 else if (config->auth_tunnel_change_addr_src)
3318 {
3319 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3320 tunnel[t].port == ntohs(addr->sin_port))
3321 {
3322 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3323 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3324 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3325
3326 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3327 }
3328 }
3329
3330 if (s && !session[s].opened) // Is something wrong??
3331 {
3332 if (!config->cluster_iam_master)
3333 {
3334 // Pass it off to the master to deal with..
3335 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3336 return;
3337 }
3338
3339 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3340 STAT(tunnel_rx_errors);
3341 return;
3342 }
3343
3344 if (proto == PPPPAP)
3345 {
3346 session[s].last_packet = time_now;
3347 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3348 processpap(s, t, p, l);
3349 }
3350 else if (proto == PPPCHAP)
3351 {
3352 session[s].last_packet = time_now;
3353 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3354 processchap(s, t, p, l);
3355 }
3356 else if (proto == PPPLCP)
3357 {
3358 session[s].last_packet = time_now;
3359 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3360 processlcp(s, t, p, l);
3361 }
3362 else if (proto == PPPIPCP)
3363 {
3364 session[s].last_packet = time_now;
3365 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3366 processipcp(s, t, p, l);
3367 }
3368 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3369 {
3370 session[s].last_packet = time_now;
3371 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3372 processipv6cp(s, t, p, l);
3373 }
3374 else if (proto == PPPCCP)
3375 {
3376 session[s].last_packet = time_now;
3377 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3378 processccp(s, t, p, l);
3379 }
3380 else if (proto == PPPIP)
3381 {
3382 if (session[s].die)
3383 {
3384 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3385 return; // closing session, PPP not processed
3386 }
3387
3388 session[s].last_packet = session[s].last_data = time_now;
3389 if (session[s].walled_garden && !config->cluster_iam_master)
3390 {
3391 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3392 return;
3393 }
3394
3395 processipin(s, t, p, l);
3396 }
3397 else if (proto == PPPMP)
3398 {
3399 if (session[s].die)
3400 {
3401 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3402 return; // closing session, PPP not processed
3403 }
3404
3405 session[s].last_packet = session[s].last_data = time_now;
3406 if (!config->cluster_iam_master)
3407 {
3408 // The fragments reconstruction is managed by the Master.
3409 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3410 return;
3411 }
3412
3413 processmpin(s, t, p, l);
3414 }
3415 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3416 {
3417 if (session[s].die)
3418 {
3419 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3420 return; // closing session, PPP not processed
3421 }
3422
3423 session[s].last_packet = session[s].last_data = time_now;
3424 if (session[s].walled_garden && !config->cluster_iam_master)
3425 {
3426 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3427 return;
3428 }
3429
3430 processipv6in(s, t, p, l);
3431 }
3432 else if (session[s].ppp.lcp == Opened)
3433 {
3434 session[s].last_packet = time_now;
3435 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3436 protoreject(s, t, p, l, proto);
3437 }
3438 else
3439 {
3440 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3441 proto, ppp_state(session[s].ppp.lcp));
3442 }
3443 }
3444 }
3445
3446 // read and process packet on tun
3447 // (i.e. this routine writes to buf[-8]).
3448 static void processtun(uint8_t * buf, int len)
3449 {
3450 LOG_HEX(5, "Receive TUN Data", buf, len);
3451 STAT(tun_rx_packets);
3452 INC_STAT(tun_rx_bytes, len);
3453
3454 CSTAT(processtun);
3455
3456 eth_rx_pkt++;
3457 eth_rx += len;
3458 if (len < 22)
3459 {
3460 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3461 STAT(tun_rx_errors);
3462 return;
3463 }
3464
3465 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3466 processipout(buf, len);
3467 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3468 && config->ipv6_prefix.s6_addr[0])
3469 processipv6out(buf, len);
3470
3471 // Else discard.
3472 }
3473
3474 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3475 // that we look at the whole of the tunnel, radius and session tables
3476 // every second
3477 static void regular_cleanups(double period)
3478 {
3479 // Next tunnel, radius and session to check for actions on.
3480 static tunnelidt t = 0;
3481 static int r = 0;
3482 static sessionidt s = 0;
3483
3484 int t_actions = 0;
3485 int r_actions = 0;
3486 int s_actions = 0;
3487
3488 int t_slice;
3489 int r_slice;
3490 int s_slice;
3491
3492 int i;
3493 int a;
3494
3495 // divide up tables into slices based on the last run
3496 t_slice = config->cluster_highest_tunnelid * period;
3497 r_slice = (MAXRADIUS - 1) * period;
3498 s_slice = config->cluster_highest_sessionid * period;
3499
3500 if (t_slice < 1)
3501 t_slice = 1;
3502 else if (t_slice > config->cluster_highest_tunnelid)
3503 t_slice = config->cluster_highest_tunnelid;
3504
3505 if (r_slice < 1)
3506 r_slice = 1;
3507 else if (r_slice > (MAXRADIUS - 1))
3508 r_slice = MAXRADIUS - 1;
3509
3510 if (s_slice < 1)
3511 s_slice = 1;
3512 else if (s_slice > config->cluster_highest_sessionid)
3513 s_slice = config->cluster_highest_sessionid;
3514
3515 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3516
3517 for (i = 0; i < t_slice; i++)
3518 {
3519 t++;
3520 if (t > config->cluster_highest_tunnelid)
3521 t = 1;
3522
3523 if (t == TUNNEL_ID_PPPOE)
3524 continue;
3525
3526 // check for expired tunnels
3527 if (tunnel[t].die && tunnel[t].die <= TIME)
3528 {
3529 STAT(tunnel_timeout);
3530 tunnelkill(t, "Expired");
3531 t_actions++;
3532 continue;
3533 }
3534 // check for message resend
3535 if (tunnel[t].retry && tunnel[t].controlc)
3536 {
3537 // resend pending messages as timeout on reply
3538 if (tunnel[t].retry <= TIME)
3539 {
3540 controlt *c = tunnel[t].controls;
3541 uint16_t w = tunnel[t].window;
3542 tunnel[t].try++; // another try
3543 if (tunnel[t].try > 5)
3544 tunnelkill(t, "Timeout on control message"); // game over
3545 else
3546 while (c && w--)
3547 {
3548 tunnelsend(c->buf, c->length, t);
3549 c = c->next;
3550 }
3551
3552 t_actions++;
3553 }
3554 }
3555 // Send hello
3556 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3557 {
3558 if (!config->disable_sending_hello)
3559 {
3560 controlt *c = controlnew(6); // sending HELLO
3561 controladd(c, 0, t); // send the message
3562 LOG(3, 0, t, "Sending HELLO message\n");
3563 t_actions++;
3564 }
3565 }
3566
3567 // Check for tunnel changes requested from the CLI
3568 if ((a = cli_tunnel_actions[t].action))
3569 {
3570 cli_tunnel_actions[t].action = 0;
3571 if (a & CLI_TUN_KILL)
3572 {
3573 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3574 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3575 t_actions++;
3576 }
3577 }
3578 }
3579
3580 for (i = 0; i < r_slice; i++)
3581 {
3582 r++;
3583 if (r >= MAXRADIUS)
3584 r = 1;
3585
3586 if (!radius[r].state)
3587 continue;
3588
3589 if (radius[r].retry <= TIME)
3590 {
3591 radiusretry(r);
3592 r_actions++;
3593 }
3594 }
3595
3596 for (i = 0; i < s_slice; i++)
3597 {
3598 s++;
3599 if (s > config->cluster_highest_sessionid)
3600 s = 1;
3601
3602 if (!session[s].opened) // Session isn't in use
3603 continue;
3604
3605 // check for expired sessions
3606 if (session[s].die)
3607 {
3608 if (session[s].die <= TIME)
3609 {
3610 sessionkill(s, "Expired");
3611 s_actions++;
3612 }
3613 continue;
3614 }
3615
3616 // PPP timeouts
3617 if (sess_local[s].lcp.restart <= time_now)
3618 {
3619 int next_state = session[s].ppp.lcp;
3620 switch (session[s].ppp.lcp)
3621 {
3622 case RequestSent:
3623 case AckReceived:
3624 next_state = RequestSent;
3625
3626 case AckSent:
3627 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3628 {
3629 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3630 sendlcp(s, session[s].tunnel);
3631 change_state(s, lcp, next_state);
3632 }
3633 else
3634 {
3635 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3636 STAT(session_timeout);
3637 }
3638
3639 s_actions++;
3640 }
3641
3642 if (session[s].die)
3643 continue;
3644 }
3645
3646 if (sess_local[s].ipcp.restart <= time_now)
3647 {
3648 int next_state = session[s].ppp.ipcp;
3649 switch (session[s].ppp.ipcp)
3650 {
3651 case RequestSent:
3652 case AckReceived:
3653 next_state = RequestSent;
3654
3655 case AckSent:
3656 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3657 {
3658 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3659 sendipcp(s, session[s].tunnel);
3660 change_state(s, ipcp, next_state);
3661 }
3662 else
3663 {
3664 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3665 STAT(session_timeout);
3666 }
3667
3668 s_actions++;
3669 }
3670
3671 if (session[s].die)
3672 continue;
3673 }
3674
3675 if (sess_local[s].ipv6cp.restart <= time_now)
3676 {
3677 int next_state = session[s].ppp.ipv6cp;
3678 switch (session[s].ppp.ipv6cp)
3679 {
3680 case RequestSent:
3681 case AckReceived:
3682 next_state = RequestSent;
3683
3684 case AckSent:
3685 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3686 {
3687 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3688 sendipv6cp(s, session[s].tunnel);
3689 change_state(s, ipv6cp, next_state);
3690 }
3691 else
3692 {
3693 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3694 change_state(s, ipv6cp, Stopped);
3695 }
3696
3697 s_actions++;
3698 }
3699 }
3700
3701 if (sess_local[s].ccp.restart <= time_now)
3702 {
3703 int next_state = session[s].ppp.ccp;
3704 switch (session[s].ppp.ccp)
3705 {
3706 case RequestSent:
3707 case AckReceived:
3708 next_state = RequestSent;
3709
3710 case AckSent:
3711 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3712 {
3713 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3714 sendccp(s, session[s].tunnel);
3715 change_state(s, ccp, next_state);
3716 }
3717 else
3718 {
3719 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3720 change_state(s, ccp, Stopped);
3721 }
3722
3723 s_actions++;
3724 }
3725 }
3726
3727 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3728 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3729 {
3730 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3731 STAT(session_timeout);
3732 s_actions++;
3733 continue;
3734 }
3735
3736 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3737 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3738 (time_now - sess_local[s].last_echo >= config->echo_timeout))
3739 {
3740 uint8_t b[MAXETHER];
3741
3742 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3743 if (!q) continue;
3744
3745 *q = EchoReq;
3746 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3747 *(uint16_t *)(q + 2) = htons(8); // Length
3748 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3749
3750 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3751 (int)(time_now - session[s].last_packet));
3752
3753 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3754 sess_local[s].last_echo = time_now;
3755 s_actions++;
3756 }
3757
3758 // Drop sessions who have reached session_timeout seconds
3759 if (session[s].session_timeout)
3760 {
3761 bundleidt bid = session[s].bundle;
3762 if (bid)
3763 {
3764 if (time_now - bundle[bid].last_check >= 1)
3765 {
3766 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3767 bundle[bid].last_check = time_now;
3768 if (bundle[bid].online_time >= session[s].session_timeout)
3769 {
3770 int ses;
3771 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3772 {
3773 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3774 s_actions++;
3775 continue;
3776 }
3777 }
3778 }
3779 }
3780 else if (time_now - session[s].opened >= session[s].session_timeout)
3781 {
3782 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3783 s_actions++;
3784 continue;
3785 }
3786 }
3787
3788 // Drop sessions who have reached idle_timeout seconds
3789 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3790 {
3791 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3792 STAT(session_timeout);
3793 s_actions++;
3794 continue;
3795 }
3796
3797 // Check for actions requested from the CLI
3798 if ((a = cli_session_actions[s].action))
3799 {
3800 int send = 0;
3801
3802 cli_session_actions[s].action = 0;
3803 if (a & CLI_SESS_KILL)
3804 {
3805 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3806 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3807 a = 0; // dead, no need to check for other actions
3808 s_actions++;
3809 }
3810
3811 if (a & CLI_SESS_NOSNOOP)
3812 {
3813 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3814 session[s].snoop_ip = 0;
3815 session[s].snoop_port = 0;
3816 s_actions++;
3817 send++;
3818 }
3819 else if (a & CLI_SESS_SNOOP)
3820 {
3821 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3822 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3823 cli_session_actions[s].snoop_port);
3824
3825 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3826 session[s].snoop_port = cli_session_actions[s].snoop_port;
3827 s_actions++;
3828 send++;
3829 }
3830
3831 if (a & CLI_SESS_NOTHROTTLE)
3832 {
3833 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3834 throttle_session(s, 0, 0);
3835 s_actions++;
3836 send++;
3837 }
3838 else if (a & CLI_SESS_THROTTLE)
3839 {
3840 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3841 cli_session_actions[s].throttle_in,
3842 cli_session_actions[s].throttle_out);
3843
3844 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3845 s_actions++;
3846 send++;
3847 }
3848
3849 if (a & CLI_SESS_NOFILTER)
3850 {
3851 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3852 filter_session(s, 0, 0);
3853 s_actions++;
3854 send++;
3855 }
3856 else if (a & CLI_SESS_FILTER)
3857 {
3858 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3859 cli_session_actions[s].filter_in,
3860 cli_session_actions[s].filter_out);
3861
3862 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3863 s_actions++;
3864 send++;
3865 }
3866
3867 if (send)
3868 cluster_send_session(s);
3869 }
3870
3871 // RADIUS interim accounting
3872 if (config->radius_accounting && config->radius_interim > 0
3873 && session[s].ip && !session[s].walled_garden
3874 && !sess_local[s].radius // RADIUS already in progress
3875 && time_now - sess_local[s].last_interim >= config->radius_interim
3876 && session[s].flags & SESSION_STARTED)
3877 {
3878 int rad = radiusnew(s);
3879 if (!rad)
3880 {
3881 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3882 STAT(radius_overflow);
3883 continue;
3884 }
3885
3886 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3887 session[s].user, session[s].unique_id);
3888
3889 radiussend(rad, RADIUSINTERIM);
3890 sess_local[s].last_interim = time_now;
3891 s_actions++;
3892 }
3893 }
3894
3895 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3896 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3897 }
3898
3899 //
3900 // Are we in the middle of a tunnel update, or radius
3901 // requests??
3902 //
3903 static int still_busy(void)
3904 {
3905 int i;
3906 static clockt last_talked = 0;
3907 static clockt start_busy_wait = 0;
3908
3909 #ifdef BGP
3910 static time_t stopped_bgp = 0;
3911 if (bgp_configured)
3912 {
3913 if (!stopped_bgp)
3914 {
3915 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3916
3917 for (i = 0; i < BGP_NUM_PEERS; i++)
3918 if (bgp_peers[i].state == Established)
3919 bgp_stop(&bgp_peers[i]);
3920
3921 stopped_bgp = time_now;
3922
3923 if (!config->cluster_iam_master)
3924 {
3925 // we don't want to become master
3926 cluster_send_ping(0);
3927
3928 return 1;
3929 }
3930 }
3931
3932 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3933 return 1;
3934 }
3935 #endif /* BGP */
3936
3937 if (!config->cluster_iam_master)
3938 return 0;
3939
3940 if (main_quit == QUIT_SHUTDOWN)
3941 {
3942 static int dropped = 0;
3943 if (!dropped)
3944 {
3945 int i;
3946
3947 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3948 for (i = 1; i < MAXTUNNEL; i++)
3949 if (tunnel[i].ip || tunnel[i].state)
3950 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3951
3952 dropped = 1;
3953 }
3954 }
3955
3956 if (start_busy_wait == 0)
3957 start_busy_wait = TIME;
3958
3959 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3960 {
3961 if (!tunnel[i].controlc)
3962 continue;
3963
3964 if (last_talked != TIME)
3965 {
3966 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3967 last_talked = TIME;
3968 }
3969 return 1;
3970 }
3971
3972 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3973 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3974 {
3975 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3976 return 0;
3977 }
3978
3979 for (i = 1; i < MAXRADIUS; i++)
3980 {
3981 if (radius[i].state == RADIUSNULL)
3982 continue;
3983 if (radius[i].state == RADIUSWAIT)
3984 continue;
3985
3986 if (last_talked != TIME)
3987 {
3988 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3989 last_talked = TIME;
3990 }
3991 return 1;
3992 }
3993
3994 return 0;
3995 }
3996
3997 #ifdef HAVE_EPOLL
3998 # include <sys/epoll.h>
3999 #else
4000 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4001 # include "fake_epoll.h"
4002 #endif
4003
4004 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4005 #define BASE_FDS (9 + MAX_UDPFD)
4006
4007 // additional polled fds
4008 #ifdef BGP
4009 # define EXTRA_FDS BGP_NUM_PEERS
4010 #else
4011 # define EXTRA_FDS 0
4012 #endif
4013
4014 // main loop - gets packets on tun or udp and processes them
4015 static void mainloop(void)
4016 {
4017 int i, j;
4018 uint8_t buf[65536];
4019 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4020 // and the forwarded pppoe session
4021 int size_bufp = sizeof(buf) - 32;
4022 clockt next_cluster_ping = 0; // send initial ping immediately
4023 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4024 int maxevent = sizeof(events)/sizeof(*events);
4025
4026 if ((epollfd = epoll_create(maxevent)) < 0)
4027 {
4028 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4029 exit(1);
4030 }
4031
4032 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",
4033 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4034
4035 /* setup our fds to poll for input */
4036 {
4037 static struct event_data d[BASE_FDS];
4038 struct epoll_event e;
4039
4040 e.events = EPOLLIN;
4041 i = 0;
4042
4043 if (clifd >= 0)
4044 {
4045 d[i].type = FD_TYPE_CLI;
4046 e.data.ptr = &d[i++];
4047 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4048 }
4049
4050 d[i].type = FD_TYPE_CLUSTER;
4051 e.data.ptr = &d[i++];
4052 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4053
4054 d[i].type = FD_TYPE_TUN;
4055 e.data.ptr = &d[i++];
4056 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4057
4058 d[i].type = FD_TYPE_CONTROL;
4059 e.data.ptr = &d[i++];
4060 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4061
4062 d[i].type = FD_TYPE_DAE;
4063 e.data.ptr = &d[i++];
4064 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4065
4066 d[i].type = FD_TYPE_NETLINK;
4067 e.data.ptr = &d[i++];
4068 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4069
4070 d[i].type = FD_TYPE_PPPOEDISC;
4071 e.data.ptr = &d[i++];
4072 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4073
4074 d[i].type = FD_TYPE_PPPOESESS;
4075 e.data.ptr = &d[i++];
4076 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4077
4078 for (j = 0; j < config->nbudpfd; j++)
4079 {
4080 d[i].type = FD_TYPE_UDP;
4081 d[i].index = j;
4082 e.data.ptr = &d[i++];
4083 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4084 }
4085 }
4086
4087 #ifdef BGP
4088 signal(SIGPIPE, SIG_IGN);
4089 bgp_setup(config->as_number);
4090 if (config->bind_address)
4091 bgp_add_route(config->bind_address, 0xffffffff);
4092
4093 for (i = 0; i < BGP_NUM_PEERS; i++)
4094 {
4095 if (config->neighbour[i].name[0])
4096 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4097 config->neighbour[i].as, config->neighbour[i].keepalive,
4098 config->neighbour[i].hold, config->neighbour[i].update_source,
4099 0); /* 0 = routing disabled */
4100 }
4101 #endif /* BGP */
4102
4103 while (!main_quit || still_busy())
4104 {
4105 int more = 0;
4106 int n;
4107
4108
4109 if (main_reload)
4110 {
4111 main_reload = 0;
4112 read_config_file();
4113 config->reload_config++;
4114 }
4115
4116 if (config->reload_config)
4117 {
4118 config->reload_config = 0;
4119 update_config();
4120 }
4121
4122 #ifdef BGP
4123 bgp_set_poll();
4124 #endif /* BGP */
4125
4126 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4127 STAT(select_called);
4128
4129 TIME = now(NULL);
4130 if (n < 0)
4131 {
4132 if (errno == EINTR ||
4133 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4134 continue;
4135
4136 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4137 break; // exit
4138 }
4139
4140 if (n)
4141 {
4142 struct sockaddr_in addr;
4143 struct in_addr local;
4144 socklen_t alen;
4145 int c, s;
4146 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4147 int pppoesess_ready = 0;
4148 int pppoesess_pkts = 0;
4149 int tun_ready = 0;
4150 int cluster_ready = 0;
4151 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4152 int tun_pkts = 0;
4153 int cluster_pkts = 0;
4154 #ifdef BGP
4155 uint32_t bgp_events[BGP_NUM_PEERS];
4156 memset(bgp_events, 0, sizeof(bgp_events));
4157 #endif /* BGP */
4158
4159 for (c = n, i = 0; i < c; i++)
4160 {
4161 struct event_data *d = events[i].data.ptr;
4162
4163 switch (d->type)
4164 {
4165 case FD_TYPE_CLI: // CLI connections
4166 {
4167 int cli;
4168
4169 alen = sizeof(addr);
4170 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4171 {
4172 cli_do(cli);
4173 close(cli);
4174 }
4175 else
4176 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4177
4178 n--;
4179 break;
4180 }
4181
4182 // these are handled below, with multiple interleaved reads
4183 case FD_TYPE_CLUSTER: cluster_ready++; break;
4184 case FD_TYPE_TUN: tun_ready++; break;
4185 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4186 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4187
4188 case FD_TYPE_PPPOEDISC: // pppoe discovery
4189 s = read(pppoediscfd, p, size_bufp);
4190 if (s > 0) process_pppoe_disc(p, s);
4191 n--;
4192 break;
4193
4194 case FD_TYPE_CONTROL: // nsctl commands
4195 alen = sizeof(addr);
4196 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4197 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4198 n--;
4199 break;
4200
4201 case FD_TYPE_DAE: // DAE requests
4202 alen = sizeof(addr);
4203 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4204 if (s > 0) processdae(p, s, &addr, alen, &local);
4205 n--;
4206 break;
4207
4208 case FD_TYPE_RADIUS: // RADIUS response
4209 alen = sizeof(addr);
4210 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4211 if (s >= 0 && config->cluster_iam_master)
4212 {
4213 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4214 addr.sin_addr.s_addr == config->radiusserver[1])
4215 processrad(p, s, d->index);
4216 else
4217 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4218 fmtaddr(addr.sin_addr.s_addr, 0));
4219 }
4220
4221 n--;
4222 break;
4223
4224 #ifdef BGP
4225 case FD_TYPE_BGP:
4226 bgp_events[d->index] = events[i].events;
4227 n--;
4228 break;
4229 #endif /* BGP */
4230
4231 case FD_TYPE_NETLINK:
4232 {
4233 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4234 s = netlink_recv(p, size_bufp);
4235 if (nh->nlmsg_type == NLMSG_ERROR)
4236 {
4237 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4238 if (errmsg->error)
4239 {
4240 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4241 {
4242 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4243 exit(1);
4244 }
4245 else
4246 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4247 }
4248 // else it's a ack
4249 }
4250 else
4251 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);
4252 n--;
4253 break;
4254 }
4255
4256 default:
4257 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4258 }
4259 }
4260
4261 #ifdef BGP
4262 bgp_process(bgp_events);
4263 #endif /* BGP */
4264
4265 for (c = 0; n && c < config->multi_read_count; c++)
4266 {
4267 for (j = 0; j < config->nbudpfd; j++)
4268 {
4269 // L2TP and L2TP REMOTE LNS
4270 if (udp_ready[j])
4271 {
4272 alen = sizeof(addr);
4273 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4274 {
4275 processudp(p, s, &addr, j);
4276 udp_pkts[j]++;
4277 }
4278 else
4279 {
4280 udp_ready[j] = 0;
4281 n--;
4282 }
4283 }
4284 }
4285
4286 // incoming IP
4287 if (tun_ready)
4288 {
4289 if ((s = read(tunfd, p, size_bufp)) > 0)
4290 {
4291 processtun(p, s);
4292 tun_pkts++;
4293 }
4294 else
4295 {
4296 tun_ready = 0;
4297 n--;
4298 }
4299 }
4300
4301 // pppoe session
4302 if (pppoesess_ready)
4303 {
4304 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4305 {
4306 process_pppoe_sess(p, s);
4307 pppoesess_pkts++;
4308 }
4309 else
4310 {
4311 pppoesess_ready = 0;
4312 n--;
4313 }
4314 }
4315
4316 // cluster
4317 if (cluster_ready)
4318 {
4319 alen = sizeof(addr);
4320 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4321 {
4322 processcluster(p, s, addr.sin_addr.s_addr);
4323 cluster_pkts++;
4324 }
4325 else
4326 {
4327 cluster_ready = 0;
4328 n--;
4329 }
4330 }
4331 }
4332
4333 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4334 STAT(multi_read_used);
4335
4336 if (c >= config->multi_read_count)
4337 {
4338 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4339 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4340 STAT(multi_read_exceeded);
4341 more++;
4342 }
4343 }
4344 #ifdef BGP
4345 else
4346 /* no event received, but timers could still have expired */
4347 bgp_process_peers_timers();
4348 #endif /* BGP */
4349
4350 if (time_changed)
4351 {
4352 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4353
4354 // Log current traffic stats
4355 snprintf(config->bandwidth, sizeof(config->bandwidth),
4356 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4357 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4358 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4359 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4360
4361 udp_tx = udp_rx = 0;
4362 udp_rx_pkt = eth_rx_pkt = 0;
4363 eth_tx = eth_rx = 0;
4364 time_changed = 0;
4365
4366 if (config->dump_speed)
4367 printf("%s\n", config->bandwidth);
4368
4369 // Update the internal time counter
4370 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4371
4372 {
4373 // Run timer hooks
4374 struct param_timer p = { time_now };
4375 run_plugins(PLUGIN_TIMER, &p);
4376 }
4377 }
4378
4379 // Runs on every machine (master and slaves).
4380 if (next_cluster_ping <= TIME)
4381 {
4382 // Check to see which of the cluster is still alive..
4383
4384 cluster_send_ping(basetime); // Only does anything if we're a slave
4385 cluster_check_master(); // ditto.
4386
4387 cluster_heartbeat(); // Only does anything if we're a master.
4388 cluster_check_slaves(); // ditto.
4389
4390 master_update_counts(); // If we're a slave, send our byte counters to our master.
4391
4392 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4393 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4394 else
4395 next_cluster_ping = TIME + config->cluster_hb_interval;
4396 }
4397
4398 if (!config->cluster_iam_master)
4399 continue;
4400
4401 // Run token bucket filtering queue..
4402 // Only run it every 1/10th of a second.
4403 {
4404 static clockt last_run = 0;
4405 if (last_run != TIME)
4406 {
4407 last_run = TIME;
4408 tbf_run_timer();
4409 }
4410 }
4411
4412 // Handle timeouts, retries etc.
4413 {
4414 static double last_clean = 0;
4415 double this_clean;
4416 double diff;
4417
4418 TIME = now(&this_clean);
4419 diff = this_clean - last_clean;
4420
4421 // Run during idle time (after we've handled
4422 // all incoming packets) or every 1/10th sec
4423 if (!more || diff > 0.1)
4424 {
4425 regular_cleanups(diff);
4426 last_clean = this_clean;
4427 }
4428 }
4429
4430 if (*config->accounting_dir)
4431 {
4432 static clockt next_acct = 0;
4433 static clockt next_shut_acct = 0;
4434
4435 if (next_acct <= TIME)
4436 {
4437 // Dump accounting data
4438 next_acct = TIME + ACCT_TIME;
4439 next_shut_acct = TIME + ACCT_SHUT_TIME;
4440 dump_acct_info(1);
4441 }
4442 else if (next_shut_acct <= TIME)
4443 {
4444 // Dump accounting data for shutdown sessions
4445 next_shut_acct = TIME + ACCT_SHUT_TIME;
4446 if (shut_acct_n)
4447 dump_acct_info(0);
4448 }
4449 }
4450 }
4451
4452 // Are we the master and shutting down??
4453 if (config->cluster_iam_master)
4454 cluster_heartbeat(); // Flush any queued changes..
4455
4456 // Ok. Notify everyone we're shutting down. If we're
4457 // the master, this will force an election.
4458 cluster_send_ping(0);
4459
4460 //
4461 // Important!!! We MUST not process any packets past this point!
4462 LOG(1, 0, 0, "Shutdown complete\n");
4463 }
4464
4465 static void stripdomain(char *host)
4466 {
4467 char *p;
4468
4469 if ((p = strchr(host, '.')))
4470 {
4471 char *domain = 0;
4472 char _domain[1024];
4473
4474 // strip off domain
4475 FILE *resolv = fopen("/etc/resolv.conf", "r");
4476 if (resolv)
4477 {
4478 char buf[1024];
4479 char *b;
4480
4481 while (fgets(buf, sizeof(buf), resolv))
4482 {
4483 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4484 continue;
4485
4486 if (!isspace(buf[6]))
4487 continue;
4488
4489 b = buf + 7;
4490 while (isspace(*b)) b++;
4491
4492 if (*b)
4493 {
4494 char *d = b;
4495 while (*b && !isspace(*b)) b++;
4496 *b = 0;
4497 if (buf[0] == 'd') // domain is canonical
4498 {
4499 domain = d;
4500 break;
4501 }
4502
4503 // first search line
4504 if (!domain)
4505 {
4506 // hold, may be subsequent domain line
4507 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4508 domain = _domain;
4509 }
4510 }
4511 }
4512
4513 fclose(resolv);
4514 }
4515
4516 if (domain)
4517 {
4518 int hl = strlen(host);
4519 int dl = strlen(domain);
4520 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4521 host[hl -dl - 1] = 0;
4522 }
4523 else
4524 {
4525 *p = 0; // everything after first dot
4526 }
4527 }
4528 }
4529
4530 // Init data structures
4531 static void initdata(int optdebug, char *optconfig)
4532 {
4533 int i;
4534
4535 if (!(config = shared_malloc(sizeof(configt))))
4536 {
4537 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4538 exit(1);
4539 }
4540
4541 memset(config, 0, sizeof(configt));
4542 time(&config->start_time);
4543 strncpy(config->config_file, optconfig, strlen(optconfig));
4544 config->debug = optdebug;
4545 config->num_tbfs = MAXTBFS;
4546 config->rl_rate = 28; // 28kbps
4547 config->cluster_mcast_ttl = 1;
4548 config->cluster_master_min_adv = 1;
4549 config->ppp_restart_time = 3;
4550 config->ppp_max_configure = 10;
4551 config->ppp_max_failure = 5;
4552 config->kill_timedout_sessions = 1;
4553 strcpy(config->random_device, RANDOMDEVICE);
4554 // Set default value echo_timeout and idle_echo_timeout
4555 config->echo_timeout = ECHO_TIMEOUT;
4556 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4557
4558 log_stream = stderr;
4559
4560 #ifdef RINGBUFFER
4561 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4562 {
4563 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4564 exit(1);
4565 }
4566 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4567 #endif
4568
4569 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4570 {
4571 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4572 exit(1);
4573 }
4574 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4575 {
4576 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4577 exit(1);
4578 }
4579 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4580 {
4581 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4582 exit(1);
4583 }
4584 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4585 {
4586 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4587 exit(1);
4588 }
4589 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4590 {
4591 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4592 exit(1);
4593 }
4594
4595 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4596 {
4597 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4598 exit(1);
4599 }
4600
4601 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4602 {
4603 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4604 exit(1);
4605 }
4606
4607 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4608 {
4609 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4610 exit(1);
4611 }
4612
4613 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4614 {
4615 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4616 exit(1);
4617 }
4618 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4619
4620 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4621 {
4622 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4623 exit(1);
4624 }
4625 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4626
4627 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4628 {
4629 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4630 exit(1);
4631 }
4632 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4633
4634 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4635 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4636 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4637 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4638 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4639
4640 // Put all the sessions on the free list marked as undefined.
4641 for (i = 1; i < MAXSESSION; i++)
4642 {
4643 session[i].next = i + 1;
4644 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4645 }
4646 session[MAXSESSION - 1].next = 0;
4647 sessionfree = 1;
4648
4649 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4650 for (i = 1; i < MAXTUNNEL; i++)
4651 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4652
4653 for (i = 1; i < MAXBUNDLE; i++) {
4654 bundle[i].state = BUNDLEUNDEF;
4655 }
4656
4657 if (!*hostname)
4658 {
4659 // Grab my hostname unless it's been specified
4660 gethostname(hostname, sizeof(hostname));
4661 stripdomain(hostname);
4662 }
4663
4664 _statistics->start_time = _statistics->last_reset = time(NULL);
4665
4666 #ifdef BGP
4667 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4668 {
4669 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4670 exit(1);
4671 }
4672 #endif /* BGP */
4673
4674 lac_initremotelnsdata();
4675
4676 grp_initdata();
4677 }
4678
4679 static int assign_ip_address(sessionidt s)
4680 {
4681 uint32_t i;
4682 int best = -1;
4683 time_t best_time = time_now;
4684 char *u = session[s].user;
4685 char reuse = 0;
4686
4687
4688 CSTAT(assign_ip_address);
4689
4690 for (i = 1; i < ip_pool_size; i++)
4691 {
4692 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4693 continue;
4694
4695 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4696 {
4697 best = i;
4698 reuse = 1;
4699 break;
4700 }
4701
4702 if (ip_address_pool[i].last < best_time)
4703 {
4704 best = i;
4705 if (!(best_time = ip_address_pool[i].last))
4706 break; // never used, grab this one
4707 }
4708 }
4709
4710 if (best < 0)
4711 {
4712 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4713 return 0;
4714 }
4715
4716 session[s].ip = ip_address_pool[best].address;
4717 session[s].ip_pool_index = best;
4718 ip_address_pool[best].assigned = 1;
4719 ip_address_pool[best].last = time_now;
4720 ip_address_pool[best].session = s;
4721 if (session[s].walled_garden)
4722 /* Don't track addresses of users in walled garden (note: this
4723 means that their address isn't "sticky" even if they get
4724 un-gardened). */
4725 ip_address_pool[best].user[0] = 0;
4726 else
4727 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4728
4729 STAT(ip_allocated);
4730 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4731 reuse ? "Reusing" : "Allocating", best);
4732
4733 return 1;
4734 }
4735
4736 static void free_ip_address(sessionidt s)
4737 {
4738 int i = session[s].ip_pool_index;
4739
4740
4741 CSTAT(free_ip_address);
4742
4743 if (!session[s].ip)
4744 return; // what the?
4745
4746 if (i < 0) // Is this actually part of the ip pool?
4747 i = 0;
4748
4749 STAT(ip_freed);
4750 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4751 session[s].ip = 0;
4752 ip_address_pool[i].assigned = 0;
4753 ip_address_pool[i].session = 0;
4754 ip_address_pool[i].last = time_now;
4755 }
4756
4757 //
4758 // Fsck the address pool against the session table.
4759 // Normally only called when we become a master.
4760 //
4761 // This isn't perfect: We aren't keep tracking of which
4762 // users used to have an IP address.
4763 //
4764 void rebuild_address_pool(void)
4765 {
4766 int i;
4767
4768 //
4769 // Zero the IP pool allocation, and build
4770 // a map from IP address to pool index.
4771 for (i = 1; i < MAXIPPOOL; ++i)
4772 {
4773 ip_address_pool[i].assigned = 0;
4774 ip_address_pool[i].session = 0;
4775 if (!ip_address_pool[i].address)
4776 continue;
4777
4778 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4779 }
4780
4781 for (i = 0; i < MAXSESSION; ++i)
4782 {
4783 int ipid;
4784 if (!(session[i].opened && session[i].ip))
4785 continue;
4786
4787 ipid = - lookup_ipmap(htonl(session[i].ip));
4788
4789 if (session[i].ip_pool_index < 0)
4790 {
4791 // Not allocated out of the pool.
4792 if (ipid < 1) // Not found in the pool either? good.
4793 continue;
4794
4795 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4796 i, fmtaddr(session[i].ip, 0), ipid);
4797
4798 // Fall through and process it as part of the pool.
4799 }
4800
4801
4802 if (ipid > MAXIPPOOL || ipid < 0)
4803 {
4804 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4805 ipid = -1;
4806 session[i].ip_pool_index = ipid;
4807 continue;
4808 }
4809
4810 ip_address_pool[ipid].assigned = 1;
4811 ip_address_pool[ipid].session = i;
4812 ip_address_pool[ipid].last = time_now;
4813 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4814 session[i].ip_pool_index = ipid;
4815 cache_ipmap(session[i].ip, i); // Fix the ip map.
4816 }
4817 }
4818
4819 //
4820 // Fix the address pool to match a changed session.
4821 // (usually when the master sends us an update).
4822 static void fix_address_pool(int sid)
4823 {
4824 int ipid;
4825
4826 ipid = session[sid].ip_pool_index;
4827
4828 if (ipid > ip_pool_size)
4829 return; // Ignore it. rebuild_address_pool will fix it up.
4830
4831 if (ip_address_pool[ipid].address != session[sid].ip)
4832 return; // Just ignore it. rebuild_address_pool will take care of it.
4833
4834 ip_address_pool[ipid].assigned = 1;
4835 ip_address_pool[ipid].session = sid;
4836 ip_address_pool[ipid].last = time_now;
4837 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4838 }
4839
4840 //
4841 // Add a block of addresses to the IP pool to hand out.
4842 //
4843 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4844 {
4845 int i;
4846 if (prefixlen == 0)
4847 prefixlen = 32; // Host route only.
4848
4849 addr &= 0xffffffff << (32 - prefixlen);
4850
4851 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4852 return ;
4853
4854 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4855 {
4856 if ((i & 0xff) == 0 || (i&0xff) == 255)
4857 continue; // Skip 0 and broadcast addresses.
4858
4859 ip_address_pool[ip_pool_size].address = i;
4860 ip_address_pool[ip_pool_size].assigned = 0;
4861 ++ip_pool_size;
4862 if (ip_pool_size >= MAXIPPOOL)
4863 {
4864 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4865 return;
4866 }
4867 }
4868 }
4869
4870 // Initialize the IP address pool
4871 static void initippool()
4872 {
4873 FILE *f;
4874 char *p;
4875 char buf[4096];
4876 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4877
4878 if (!(f = fopen(IPPOOLFILE, "r")))
4879 {
4880 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4881 exit(1);
4882 }
4883
4884 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4885 {
4886 char *pool = buf;
4887 buf[4095] = 0; // Force it to be zero terminated/
4888
4889 if (*buf == '#' || *buf == '\n')
4890 continue; // Skip comments / blank lines
4891 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4892 if ((p = (char *)strchr(buf, ':')))
4893 {
4894 in_addr_t src;
4895 *p = '\0';
4896 src = inet_addr(buf);
4897 if (src == INADDR_NONE)
4898 {
4899 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4900 exit(1);
4901 }
4902 // This entry is for a specific IP only
4903 if (src != config->bind_address)
4904 continue;
4905 *p = ':';
4906 pool = p+1;
4907 }
4908 if ((p = (char *)strchr(pool, '/')))
4909 {
4910 // It's a range
4911 int numbits = 0;
4912 in_addr_t start = 0;
4913
4914 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4915 *p++ = 0;
4916 if (!*p || !(numbits = atoi(p)))
4917 {
4918 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4919 continue;
4920 }
4921 start = ntohl(inet_addr(pool));
4922
4923 // Add a static route for this pool
4924 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4925 fmtaddr(htonl(start), 0), numbits);
4926
4927 routeset(0, start, numbits, 0, 1);
4928
4929 add_to_ip_pool(start, numbits);
4930 }
4931 else
4932 {
4933 // It's a single ip address
4934 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4935 }
4936 }
4937 fclose(f);
4938 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4939 }
4940
4941 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4942 {
4943 struct sockaddr_in snoop_addr = {0};
4944 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4945 return;
4946
4947 snoop_addr.sin_family = AF_INET;
4948 snoop_addr.sin_addr.s_addr = destination;
4949 snoop_addr.sin_port = ntohs(port);
4950
4951 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4952 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4953 htons(snoop_addr.sin_port));
4954
4955 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4956 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4957
4958 STAT(packets_snooped);
4959 }
4960
4961 static int dump_session(FILE **f, sessiont *s)
4962 {
4963 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4964 return 1;
4965
4966 if (!*f)
4967 {
4968 char filename[1024];
4969 char timestr[64];
4970 time_t now = time(NULL);
4971
4972 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4973 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4974
4975 if (!(*f = fopen(filename, "w")))
4976 {
4977 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4978 return 0;
4979 }
4980
4981 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4982 if(config->account_all_origin)
4983 {
4984 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4985 "# host: %s\n"
4986 "# endpoint: %s\n"
4987 "# time: %ld\n"
4988 "# uptime: %ld\n"
4989 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
4990 hostname,
4991 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4992 now,
4993 now - basetime);
4994 }
4995 else
4996 {
4997 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4998 "# host: %s\n"
4999 "# endpoint: %s\n"
5000 "# time: %ld\n"
5001 "# uptime: %ld\n"
5002 "# format: username ip qos uptxoctets downrxoctets\n",
5003 hostname,
5004 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5005 now,
5006 now - basetime);
5007 }
5008 }
5009
5010 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
5011 if(config->account_all_origin)
5012 {
5013 fprintf(*f, "%s %s %d %u %u %s\n",
5014 s->user, // username
5015 fmtaddr(htonl(s->ip), 0), // ip
5016 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5017 (uint32_t) s->cin_delta, // uptxoctets
5018 (uint32_t) s->cout_delta, // downrxoctets
5019 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
5020 }
5021 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
5022 {
5023 fprintf(*f, "%s %s %d %u %u\n",
5024 s->user, // username
5025 fmtaddr(htonl(s->ip), 0), // ip
5026 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5027 (uint32_t) s->cin_delta, // uptxoctets
5028 (uint32_t) s->cout_delta); // downrxoctets
5029 }
5030
5031 s->cin_delta = s->cout_delta = 0;
5032
5033 return 1;
5034 }
5035
5036 static void dump_acct_info(int all)
5037 {
5038 int i;
5039 FILE *f = NULL;
5040
5041
5042 CSTAT(dump_acct_info);
5043
5044 if (shut_acct_n)
5045 {
5046 for (i = 0; i < shut_acct_n; i++)
5047 dump_session(&f, &shut_acct[i]);
5048
5049 shut_acct_n = 0;
5050 }
5051
5052 if (all)
5053 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5054 dump_session(&f, &session[i]);
5055
5056 if (f)
5057 fclose(f);
5058 }
5059
5060 // Main program
5061 int main(int argc, char *argv[])
5062 {
5063 int i;
5064 int optdebug = 0;
5065 char *optconfig = CONFIGFILE;
5066
5067 time(&basetime); // start clock
5068
5069 // scan args
5070 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5071 {
5072 switch (i)
5073 {
5074 case 'd':
5075 if (fork()) exit(0);
5076 setsid();
5077 freopen("/dev/null", "r", stdin);
5078 freopen("/dev/null", "w", stdout);
5079 freopen("/dev/null", "w", stderr);
5080 break;
5081 case 'v':
5082 optdebug++;
5083 break;
5084 case 'c':
5085 optconfig = optarg;
5086 break;
5087 case 'h':
5088 snprintf(hostname, sizeof(hostname), "%s", optarg);
5089 break;
5090 default:
5091 printf("Args are:\n"
5092 "\t-d\t\tDetach from terminal\n"
5093 "\t-c <file>\tConfig file\n"
5094 "\t-h <hostname>\tForce hostname\n"
5095 "\t-v\t\tDebug\n");
5096
5097 return (0);
5098 break;
5099 }
5100 }
5101
5102 // Start the timer routine off
5103 time(&time_now);
5104 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5105
5106 initplugins();
5107 initdata(optdebug, optconfig);
5108
5109 init_cli();
5110 read_config_file();
5111 /* set hostname /after/ having read the config file */
5112 if (*config->hostname)
5113 strcpy(hostname, config->hostname);
5114 cli_init_complete(hostname);
5115 update_config();
5116 init_tbf(config->num_tbfs);
5117
5118 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5119 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5120 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5121 {
5122 struct rlimit rlim;
5123 rlim.rlim_cur = RLIM_INFINITY;
5124 rlim.rlim_max = RLIM_INFINITY;
5125 // Remove the maximum core size
5126 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5127 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5128
5129 // Make core dumps go to /tmp
5130 chdir("/tmp");
5131 }
5132
5133 if (config->scheduler_fifo)
5134 {
5135 int ret;
5136 struct sched_param params = {0};
5137 params.sched_priority = 1;
5138
5139 if (get_nprocs() < 2)
5140 {
5141 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5142 config->scheduler_fifo = 0;
5143 }
5144 else
5145 {
5146 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5147 {
5148 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5149 }
5150 else
5151 {
5152 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5153 config->scheduler_fifo = 0;
5154 }
5155 }
5156 }
5157
5158 initnetlink();
5159
5160 /* Set up the cluster communications port. */
5161 if (cluster_init() < 0)
5162 exit(1);
5163
5164 inittun();
5165 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5166
5167 if (*config->pppoe_if_to_bind)
5168 {
5169 init_pppoe();
5170 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5171 }
5172
5173 if (!config->nbmultiaddress)
5174 {
5175 config->bind_n_address[0] = config->bind_address;
5176 config->nbmultiaddress++;
5177 }
5178 config->nbudpfd = config->nbmultiaddress;
5179 for (i = 0; i < config->nbudpfd; i++)
5180 initudp(&udpfd[i], config->bind_n_address[i]);
5181 initlacudp();
5182 config->indexlacudpfd = config->nbudpfd;
5183 udpfd[config->indexlacudpfd] = udplacfd;
5184 config->nbudpfd++;
5185
5186 initcontrol();
5187 initdae();
5188
5189 // Intercept
5190 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5191
5192 initrad();
5193 initippool();
5194
5195 // seed prng
5196 {
5197 unsigned seed = time_now ^ getpid();
5198 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5199 srand(seed);
5200 }
5201
5202 signal(SIGHUP, sighup_handler);
5203 signal(SIGCHLD, sigchild_handler);
5204 signal(SIGTERM, shutdown_handler);
5205 signal(SIGINT, shutdown_handler);
5206 signal(SIGQUIT, shutdown_handler);
5207
5208 // Prevent us from getting paged out
5209 if (config->lock_pages)
5210 {
5211 if (!mlockall(MCL_CURRENT))
5212 LOG(1, 0, 0, "Locking pages into memory\n");
5213 else
5214 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5215 }
5216
5217 //LOG(3, 0, 0, "Debug sizeof struct: sessiont %lu, tunnelt %lu, bundlet %lu, groupsesst %lu\n",
5218 // sizeof(sessiont), sizeof(tunnelt), sizeof(bundlet), sizeof(groupsesst));
5219
5220 mainloop();
5221
5222 /* remove plugins (so cleanup code gets run) */
5223 plugins_done();
5224
5225 // Remove the PID file if we wrote it
5226 if (config->wrote_pid && *config->pid_file == '/')
5227 unlink(config->pid_file);
5228
5229 /* kill CLI children */
5230 signal(SIGTERM, SIG_IGN);
5231 kill(0, SIGTERM);
5232 return 0;
5233 }
5234
5235 static void sighup_handler(int sig)
5236 {
5237 main_reload++;
5238 }
5239
5240 static void shutdown_handler(int sig)
5241 {
5242 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5243 }
5244
5245 static void sigchild_handler(int sig)
5246 {
5247 while (waitpid(-1, NULL, WNOHANG) > 0)
5248 ;
5249 }
5250
5251 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5252 {
5253 MD5_CTX ctx;
5254 *challenge_response = NULL;
5255
5256 if (!*config->l2tp_secret)
5257 {
5258 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5259 return;
5260 }
5261
5262 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5263
5264 *challenge_response = calloc(17, 1);
5265
5266 MD5_Init(&ctx);
5267 MD5_Update(&ctx, &id, 1);
5268 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5269 MD5_Update(&ctx, challenge, challenge_length);
5270 MD5_Final(*challenge_response, &ctx);
5271
5272 return;
5273 }
5274
5275 static int facility_value(char *name)
5276 {
5277 int i;
5278 for (i = 0; facilitynames[i].c_name; i++)
5279 {
5280 if (strcmp(facilitynames[i].c_name, name) == 0)
5281 return facilitynames[i].c_val;
5282 }
5283 return 0;
5284 }
5285
5286 static void update_config()
5287 {
5288 int i;
5289 char *p;
5290 static int timeout = 0;
5291 static int interval = 0;
5292
5293 // Update logging
5294 closelog();
5295 syslog_log = 0;
5296 if (log_stream)
5297 {
5298 if (log_stream != stderr)
5299 fclose(log_stream);
5300
5301 log_stream = NULL;
5302 }
5303
5304 if (*config->log_filename)
5305 {
5306 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5307 {
5308 char *p = config->log_filename + 7;
5309 if (*p)
5310 {
5311 openlog("l2tpns", LOG_PID, facility_value(p));
5312 syslog_log = 1;
5313 }
5314 }
5315 else if (strchr(config->log_filename, '/') == config->log_filename)
5316 {
5317 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5318 {
5319 fseek(log_stream, 0, SEEK_END);
5320 setbuf(log_stream, NULL);
5321 }
5322 else
5323 {
5324 log_stream = stderr;
5325 setbuf(log_stream, NULL);
5326 }
5327 }
5328 }
5329 else
5330 {
5331 log_stream = stderr;
5332 setbuf(log_stream, NULL);
5333 }
5334
5335 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5336 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5337
5338 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5339 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5340 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5341
5342 // reset MRU/MSS globals
5343 MRU = config->l2tp_mtu - L2TP_HDRS;
5344 if (MRU > PPPoE_MRU)
5345 MRU = PPPoE_MRU;
5346
5347 MSS = MRU - TCP_HDRS;
5348
5349 // Update radius
5350 config->numradiusservers = 0;
5351 for (i = 0; i < MAXRADSERVER; i++)
5352 if (config->radiusserver[i])
5353 {
5354 config->numradiusservers++;
5355 // Set radius port: if not set, take the port from the
5356 // first radius server. For the first radius server,
5357 // take the #defined default value from l2tpns.h
5358
5359 // test twice, In case someone works with
5360 // a secondary radius server without defining
5361 // a primary one, this will work even then.
5362 if (i > 0 && !config->radiusport[i])
5363 config->radiusport[i] = config->radiusport[i-1];
5364 if (!config->radiusport[i])
5365 config->radiusport[i] = RADPORT;
5366 }
5367
5368 if (!config->numradiusservers)
5369 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5370
5371 // parse radius_authtypes_s
5372 config->radius_authtypes = config->radius_authprefer = 0;
5373 p = config->radius_authtypes_s;
5374 while (p && *p)
5375 {
5376 char *s = strpbrk(p, " \t,");
5377 int type = 0;
5378
5379 if (s)
5380 {
5381 *s++ = 0;
5382 while (*s == ' ' || *s == '\t')
5383 s++;
5384
5385 if (!*s)
5386 s = 0;
5387 }
5388
5389 if (!strncasecmp("chap", p, strlen(p)))
5390 type = AUTHCHAP;
5391 else if (!strncasecmp("pap", p, strlen(p)))
5392 type = AUTHPAP;
5393 else
5394 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5395
5396 config->radius_authtypes |= type;
5397 if (!config->radius_authprefer)
5398 config->radius_authprefer = type;
5399
5400 p = s;
5401 }
5402
5403 if (!config->radius_authtypes)
5404 {
5405 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5406 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5407 }
5408
5409 // normalise radius_authtypes_s
5410 if (config->radius_authprefer == AUTHPAP)
5411 {
5412 strcpy(config->radius_authtypes_s, "pap");
5413 if (config->radius_authtypes & AUTHCHAP)
5414 strcat(config->radius_authtypes_s, ", chap");
5415 }
5416 else
5417 {
5418 strcpy(config->radius_authtypes_s, "chap");
5419 if (config->radius_authtypes & AUTHPAP)
5420 strcat(config->radius_authtypes_s, ", pap");
5421 }
5422
5423 if (!config->radius_dae_port)
5424 config->radius_dae_port = DAEPORT;
5425
5426 if(!config->bind_portremotelns)
5427 config->bind_portremotelns = L2TPLACPORT;
5428 if(!config->bind_address_remotelns)
5429 config->bind_address_remotelns = INADDR_ANY;
5430
5431 if (*config->bind_multi_address)
5432 {
5433 char *sip = config->bind_multi_address;
5434 char *n = sip;
5435 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5436 config->nbmultiaddress = 0;
5437
5438 while (*sip && (sip < e))
5439 {
5440 in_addr_t ip = 0;
5441 uint8_t u = 0;
5442
5443 while (n < e && (*n == ',' || *n == ' ')) n++;
5444
5445 while (n < e && (isdigit(*n) || *n == '.'))
5446 {
5447 if (*n == '.')
5448 {
5449 ip = (ip << 8) + u;
5450 u = 0;
5451 }
5452 else
5453 u = u * 10 + *n - '0';
5454 n++;
5455 }
5456 ip = (ip << 8) + u;
5457 n++;
5458
5459 if (ip)
5460 {
5461 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5462 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5463 config->nbmultiaddress++;
5464 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5465
5466 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5467 }
5468
5469 sip = n;
5470 }
5471
5472 if (config->nbmultiaddress >= 1)
5473 {
5474 config->bind_address = config->bind_n_address[0];
5475 config->iftun_address = config->bind_address;
5476 }
5477 }
5478
5479 if(!config->iftun_address)
5480 {
5481 config->iftun_address = config->bind_address;
5482 config->iftun_n_address[0] = config->iftun_address;
5483 }
5484
5485 if (*config->multi_hostname)
5486 {
5487 char *shost = config->multi_hostname;
5488 char *n = shost;
5489 char *e = config->multi_hostname + strlen(config->multi_hostname);
5490 config->nbmultihostname = 0;
5491
5492 while (*shost && (shost < e))
5493 {
5494 while ((n < e) && (*n == ' ' || *n == '\t')) n++;
5495
5496 i = 0;
5497 while (n < e && (*n != ',') && (*n != '\t'))
5498 {
5499 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5500 n++;i++;
5501 }
5502 if (i > 0)
5503 {
5504 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5505 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5506 config->nbmultihostname++;
5507 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5508 }
5509
5510 shost = n;
5511 }
5512
5513 if (config->nbmultihostname >= 1)
5514 {
5515 strcpy(hostname, config->multi_n_hostname[0]);
5516 strcpy(config->hostname, hostname);
5517 }
5518 }
5519
5520 if (!*config->pppoe_ac_name)
5521 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5522
5523 // re-initialise the random number source
5524 initrandom(config->random_device);
5525
5526 // Update plugins
5527 for (i = 0; i < MAXPLUGINS; i++)
5528 {
5529 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5530 continue;
5531
5532 if (*config->plugins[i])
5533 {
5534 // Plugin added
5535 add_plugin(config->plugins[i]);
5536 }
5537 else if (*config->old_plugins[i])
5538 {
5539 // Plugin removed
5540 remove_plugin(config->old_plugins[i]);
5541 }
5542 }
5543
5544 // Guest change
5545 guest_accounts_num = 0;
5546 char *p2 = config->guest_user;
5547 while (p2 && *p2)
5548 {
5549 char *s = strpbrk(p2, " \t,");
5550 if (s)
5551 {
5552 *s++ = 0;
5553 while (*s == ' ' || *s == '\t')
5554 s++;
5555
5556 if (!*s)
5557 s = 0;
5558 }
5559
5560 strcpy(guest_users[guest_accounts_num], p2);
5561 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5562 guest_accounts_num++;
5563 p2 = s;
5564 }
5565 // Rebuild the guest_user array
5566 strcpy(config->guest_user, "");
5567 int ui = 0;
5568 for (ui=0; ui<guest_accounts_num; ui++)
5569 {
5570 strcat(config->guest_user, guest_users[ui]);
5571 if (ui<guest_accounts_num-1)
5572 {
5573 strcat(config->guest_user, ",");
5574 }
5575 }
5576
5577
5578 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5579 if (!config->multi_read_count) config->multi_read_count = 10;
5580 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5581 if (!*config->cluster_interface)
5582 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5583
5584 if (!config->cluster_hb_interval)
5585 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5586
5587 if (!config->cluster_hb_timeout)
5588 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5589
5590 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5591 {
5592 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5593 // late, ensure we're sufficiently larger than that
5594 int t = 4 * config->cluster_hb_interval + 11;
5595
5596 if (config->cluster_hb_timeout < t)
5597 {
5598 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5599 config->cluster_hb_timeout = t;
5600 }
5601
5602 // Push timing changes to the slaves immediately if we're the master
5603 if (config->cluster_iam_master)
5604 cluster_heartbeat();
5605
5606 interval = config->cluster_hb_interval;
5607 timeout = config->cluster_hb_timeout;
5608 }
5609
5610 // Write PID file
5611 if (*config->pid_file == '/' && !config->wrote_pid)
5612 {
5613 FILE *f;
5614 if ((f = fopen(config->pid_file, "w")))
5615 {
5616 fprintf(f, "%d\n", getpid());
5617 fclose(f);
5618 config->wrote_pid = 1;
5619 }
5620 else
5621 {
5622 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5623 }
5624 }
5625 }
5626
5627 static void read_config_file()
5628 {
5629 FILE *f;
5630
5631 if (!config->config_file) return;
5632 if (!(f = fopen(config->config_file, "r")))
5633 {
5634 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5635 return;
5636 }
5637
5638 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5639 cli_do_file(f);
5640 LOG(3, 0, 0, "Done reading config file\n");
5641 fclose(f);
5642 }
5643
5644 int sessionsetup(sessionidt s, tunnelidt t)
5645 {
5646 // A session now exists, set it up
5647 in_addr_t ip;
5648 char *user;
5649 sessionidt i;
5650 int r;
5651
5652 CSTAT(sessionsetup);
5653
5654 LOG(3, s, t, "Doing session setup for session\n");
5655
5656 // Join a bundle if the MRRU option is accepted
5657 if(session[s].mrru > 0 && session[s].bundle == 0)
5658 {
5659 LOG(3, s, t, "This session can be part of multilink bundle\n");
5660 if (join_bundle(s) > 0)
5661 cluster_send_bundle(session[s].bundle);
5662 else
5663 {
5664 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5665 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5666 return 0;
5667 }
5668 }
5669
5670 if (!session[s].ip)
5671 {
5672 assign_ip_address(s);
5673 if (!session[s].ip)
5674 {
5675 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5676 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5677 return 0;
5678 }
5679 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5680 fmtaddr(htonl(session[s].ip), 0));
5681 }
5682
5683 // Make sure this is right
5684 session[s].tunnel = t;
5685
5686 // zap old sessions with same IP and/or username
5687 // Don't kill gardened sessions - doing so leads to a DoS
5688 // from someone who doesn't need to know the password
5689 {
5690 ip = session[s].ip;
5691 user = session[s].user;
5692 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5693 {
5694 if (i == s) continue;
5695 if (!session[s].opened) break;
5696 // Allow duplicate sessions for multilink ones of the same bundle.
5697 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5698
5699 if (ip == session[i].ip)
5700 {
5701 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5702 continue;
5703 }
5704
5705 if (config->allow_duplicate_users) continue;
5706 if (session[s].walled_garden || session[i].walled_garden) continue;
5707 // Guest change
5708 int found = 0;
5709 int gu;
5710 for (gu = 0; gu < guest_accounts_num; gu++)
5711 {
5712 if (!strcasecmp(user, guest_users[gu]))
5713 {
5714 found = 1;
5715 break;
5716 }
5717 }
5718 if (found) continue;
5719
5720 // Drop the new session in case of duplicate sessionss, not the old one.
5721 if (!strcasecmp(user, session[i].user))
5722 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5723 }
5724 }
5725
5726 // no need to set a route for the same IP address of the bundle
5727 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5728 {
5729 int routed = 0;
5730 groupidt g;
5731
5732 // Add the route for this session.
5733 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5734 {
5735 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5736 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5737 routed++;
5738
5739 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5740 }
5741
5742 // Static IPs need to be routed if not already
5743 // convered by a Framed-Route. Anything else is part
5744 // of the IP address pool and is already routed, it
5745 // just needs to be added to the IP cache.
5746 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5747 if (session[s].ip_pool_index == -1) // static ip
5748 {
5749 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5750 }
5751 else
5752 cache_ipmap(session[s].ip, s);
5753
5754 if ((g = grp_groupbysession(s)))
5755 {
5756 grp_setgrouproute(g, 1);
5757 cluster_send_groupe(g);
5758 }
5759 }
5760
5761 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5762 lcp_open(s, t); // transition to Network phase and send initial IPCP
5763
5764 // Run the plugin's against this new session.
5765 {
5766 struct param_new_session data = { &tunnel[t], &session[s] };
5767 run_plugins(PLUGIN_NEW_SESSION, &data);
5768 }
5769
5770 // Allocate TBFs if throttled
5771 if (session[s].throttle_in || session[s].throttle_out)
5772 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5773
5774 session[s].last_packet = session[s].last_data = time_now;
5775
5776 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5777 fmtaddr(htonl(session[s].ip), 0),
5778 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5779
5780 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5781
5782 return 1; // RADIUS OK and IP allocated, done...
5783 }
5784
5785 //
5786 // This session just got dropped on us by the master or something.
5787 // Make sure our tables up up to date...
5788 //
5789 int load_session(sessionidt s, sessiont *new)
5790 {
5791 int i;
5792 int newip = 0;
5793
5794 // Sanity checks.
5795 if (new->ip_pool_index >= MAXIPPOOL ||
5796 new->tunnel >= MAXTUNNEL)
5797 {
5798 LOG(0, s, 0, "Strange session update received!\n");
5799 // FIXME! What to do here?
5800 return 0;
5801 }
5802
5803 //
5804 // Ok. All sanity checks passed. Now we're committed to
5805 // loading the new session.
5806 //
5807
5808 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5809
5810 // See if routes/ip cache need updating
5811 if (new->ip != session[s].ip)
5812 newip++;
5813
5814 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5815 if (new->route[i].ip != session[s].route[i].ip ||
5816 new->route[i].prefixlen != session[s].route[i].prefixlen)
5817 newip++;
5818
5819 // needs update
5820 if (newip)
5821 {
5822 int routed = 0;
5823
5824 // remove old routes...
5825 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5826 {
5827 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5828 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5829 routed++;
5830
5831 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5832 }
5833
5834 // ...ip
5835 if (session[s].ip)
5836 {
5837 if (session[s].ip_pool_index == -1) // static IP
5838 {
5839 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5840 }
5841 else // It's part of the IP pool, remove it manually.
5842 uncache_ipmap(session[s].ip);
5843 }
5844
5845 routed = 0;
5846
5847 // add new routes...
5848 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5849 {
5850 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5851 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5852 routed++;
5853
5854 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5855 }
5856
5857 // ...ip
5858 if (new->ip)
5859 {
5860 // If there's a new one, add it.
5861 if (new->ip_pool_index == -1)
5862 {
5863 if (!routed) routeset(s, new->ip, 0, 0, 1);
5864 }
5865 else
5866 cache_ipmap(new->ip, s);
5867 }
5868 }
5869
5870 // check v6 routing
5871 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5872 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5873
5874 // check filters
5875 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5876 {
5877 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5878 new->filter_in = 0;
5879 }
5880
5881 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5882 {
5883 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5884 new->filter_out = 0;
5885 }
5886
5887 if (new->filter_in != session[s].filter_in)
5888 {
5889 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5890 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5891 }
5892
5893 if (new->filter_out != session[s].filter_out)
5894 {
5895 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5896 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5897 }
5898
5899 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5900 // for walking the sessions to forward byte counts to the master.
5901 config->cluster_highest_sessionid = s;
5902
5903 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5904
5905 // Do fixups into address pool.
5906 if (new->ip_pool_index != -1)
5907 fix_address_pool(s);
5908
5909 return 1;
5910 }
5911
5912 static void initplugins()
5913 {
5914 int i;
5915
5916 loaded_plugins = ll_init();
5917 // Initialize the plugins to nothing
5918 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5919 plugins[i] = ll_init();
5920 }
5921
5922 static void *open_plugin(char *plugin_name, int load)
5923 {
5924 char path[256] = "";
5925
5926 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5927 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5928 return dlopen(path, RTLD_NOW);
5929 }
5930
5931 // plugin callback to get a config value
5932 static void *getconfig(char *key, enum config_typet type)
5933 {
5934 int i;
5935
5936 for (i = 0; config_values[i].key; i++)
5937 {
5938 if (!strcmp(config_values[i].key, key))
5939 {
5940 if (config_values[i].type == type)
5941 return ((void *) config) + config_values[i].offset;
5942
5943 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5944 key, type, config_values[i].type);
5945
5946 return 0;
5947 }
5948 }
5949
5950 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5951 return 0;
5952 }
5953
5954 static int add_plugin(char *plugin_name)
5955 {
5956 static struct pluginfuncs funcs = {
5957 _log,
5958 _log_hex,
5959 fmtaddr,
5960 sessionbyuser,
5961 sessiontbysessionidt,
5962 sessionidtbysessiont,
5963 radiusnew,
5964 radiussend,
5965 getconfig,
5966 sessionshutdown,
5967 sessionkill,
5968 throttle_session,
5969 cluster_send_session,
5970 };
5971
5972 void *p = open_plugin(plugin_name, 1);
5973 int (*initfunc)(struct pluginfuncs *);
5974 int i;
5975
5976 if (!p)
5977 {
5978 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5979 return -1;
5980 }
5981
5982 if (ll_contains(loaded_plugins, p))
5983 {
5984 dlclose(p);
5985 return 0; // already loaded
5986 }
5987
5988 {
5989 int *v = dlsym(p, "plugin_api_version");
5990 if (!v || *v != PLUGIN_API_VERSION)
5991 {
5992 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5993 dlclose(p);
5994 return -1;
5995 }
5996 }
5997
5998 if ((initfunc = dlsym(p, "plugin_init")))
5999 {
6000 if (!initfunc(&funcs))
6001 {
6002 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6003 dlclose(p);
6004 return -1;
6005 }
6006 }
6007
6008 ll_push(loaded_plugins, p);
6009
6010 for (i = 0; i < max_plugin_functions; i++)
6011 {
6012 void *x;
6013 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6014 {
6015 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
6016 ll_push(plugins[i], x);
6017 }
6018 }
6019
6020 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
6021 return 1;
6022 }
6023
6024 static void run_plugin_done(void *plugin)
6025 {
6026 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
6027
6028 if (donefunc)
6029 donefunc();
6030 }
6031
6032 static int remove_plugin(char *plugin_name)
6033 {
6034 void *p = open_plugin(plugin_name, 0);
6035 int loaded = 0;
6036
6037 if (!p)
6038 return -1;
6039
6040 if (ll_contains(loaded_plugins, p))
6041 {
6042 int i;
6043 for (i = 0; i < max_plugin_functions; i++)
6044 {
6045 void *x;
6046 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6047 ll_delete(plugins[i], x);
6048 }
6049
6050 ll_delete(loaded_plugins, p);
6051 run_plugin_done(p);
6052 loaded = 1;
6053 }
6054
6055 dlclose(p);
6056 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6057 return loaded;
6058 }
6059
6060 int run_plugins(int plugin_type, void *data)
6061 {
6062 int (*func)(void *data);
6063
6064 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6065 return PLUGIN_RET_ERROR;
6066
6067 ll_reset(plugins[plugin_type]);
6068 while ((func = ll_next(plugins[plugin_type])))
6069 {
6070 int r = func(data);
6071
6072 if (r != PLUGIN_RET_OK)
6073 return r; // stop here
6074 }
6075
6076 return PLUGIN_RET_OK;
6077 }
6078
6079 static void plugins_done()
6080 {
6081 void *p;
6082
6083 ll_reset(loaded_plugins);
6084 while ((p = ll_next(loaded_plugins)))
6085 run_plugin_done(p);
6086 }
6087
6088 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6089 {
6090 struct nsctl request;
6091 struct nsctl response;
6092 int type = unpack_control(&request, buf, len);
6093 int r;
6094 void *p;
6095
6096 if (log_stream && config->debug >= 4)
6097 {
6098 if (type < 0)
6099 {
6100 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6101 fmtaddr(addr->sin_addr.s_addr, 0), type);
6102 }
6103 else
6104 {
6105 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6106 dump_control(&request, log_stream);
6107 }
6108 }
6109
6110 switch (type)
6111 {
6112 case NSCTL_REQ_LOAD:
6113 if (request.argc != 1)
6114 {
6115 response.type = NSCTL_RES_ERR;
6116 response.argc = 1;
6117 response.argv[0] = "name of plugin required";
6118 }
6119 else if ((r = add_plugin(request.argv[0])) < 1)
6120 {
6121 response.type = NSCTL_RES_ERR;
6122 response.argc = 1;
6123 response.argv[0] = !r
6124 ? "plugin already loaded"
6125 : "error loading plugin";
6126 }
6127 else
6128 {
6129 response.type = NSCTL_RES_OK;
6130 response.argc = 0;
6131 }
6132
6133 break;
6134
6135 case NSCTL_REQ_UNLOAD:
6136 if (request.argc != 1)
6137 {
6138 response.type = NSCTL_RES_ERR;
6139 response.argc = 1;
6140 response.argv[0] = "name of plugin required";
6141 }
6142 else if ((r = remove_plugin(request.argv[0])) < 1)
6143 {
6144 response.type = NSCTL_RES_ERR;
6145 response.argc = 1;
6146 response.argv[0] = !r
6147 ? "plugin not loaded"
6148 : "plugin not found";
6149 }
6150 else
6151 {
6152 response.type = NSCTL_RES_OK;
6153 response.argc = 0;
6154 }
6155
6156 break;
6157
6158 case NSCTL_REQ_HELP:
6159 response.type = NSCTL_RES_OK;
6160 response.argc = 0;
6161
6162 ll_reset(loaded_plugins);
6163 while ((p = ll_next(loaded_plugins)))
6164 {
6165 char **help = dlsym(p, "plugin_control_help");
6166 while (response.argc < 0xff && help && *help)
6167 response.argv[response.argc++] = *help++;
6168 }
6169
6170 break;
6171
6172 case NSCTL_REQ_CONTROL:
6173 {
6174 struct param_control param = {
6175 config->cluster_iam_master,
6176 request.argc,
6177 request.argv,
6178 0,
6179 NULL,
6180 };
6181
6182 int r = run_plugins(PLUGIN_CONTROL, &param);
6183
6184 if (r == PLUGIN_RET_ERROR)
6185 {
6186 response.type = NSCTL_RES_ERR;
6187 response.argc = 1;
6188 response.argv[0] = param.additional
6189 ? param.additional
6190 : "error returned by plugin";
6191 }
6192 else if (r == PLUGIN_RET_NOTMASTER)
6193 {
6194 static char msg[] = "must be run on master: 000.000.000.000";
6195
6196 response.type = NSCTL_RES_ERR;
6197 response.argc = 1;
6198 if (config->cluster_master_address)
6199 {
6200 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6201 response.argv[0] = msg;
6202 }
6203 else
6204 {
6205 response.argv[0] = "must be run on master: none elected";
6206 }
6207 }
6208 else if (!(param.response & NSCTL_RESPONSE))
6209 {
6210 response.type = NSCTL_RES_ERR;
6211 response.argc = 1;
6212 response.argv[0] = param.response
6213 ? "unrecognised response value from plugin"
6214 : "unhandled action";
6215 }
6216 else
6217 {
6218 response.type = param.response;
6219 response.argc = 0;
6220 if (param.additional)
6221 {
6222 response.argc = 1;
6223 response.argv[0] = param.additional;
6224 }
6225 }
6226 }
6227
6228 break;
6229
6230 default:
6231 response.type = NSCTL_RES_ERR;
6232 response.argc = 1;
6233 response.argv[0] = "error unpacking control packet";
6234 }
6235
6236 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6237 if (!buf)
6238 {
6239 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6240 return;
6241 }
6242
6243 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6244 if (r > 0)
6245 {
6246 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6247 if (log_stream && config->debug >= 4)
6248 {
6249 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6250 dump_control(&response, log_stream);
6251 }
6252 }
6253 else
6254 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6255 fmtaddr(addr->sin_addr.s_addr, 0), r);
6256
6257 free(buf);
6258 }
6259
6260 static tunnelidt new_tunnel()
6261 {
6262 tunnelidt i;
6263 for (i = 1; i < MAXTUNNEL; i++)
6264 {
6265 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6266 {
6267 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6268 if (i > config->cluster_highest_tunnelid)
6269 config->cluster_highest_tunnelid = i;
6270 return i;
6271 }
6272 }
6273 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6274 return 0;
6275 }
6276
6277 //
6278 // We're becoming the master. Do any required setup..
6279 //
6280 // This is principally telling all the plugins that we're
6281 // now a master, and telling them about all the sessions
6282 // that are active too..
6283 //
6284 void become_master(void)
6285 {
6286 int s, i;
6287 static struct event_data d[RADIUS_FDS];
6288 struct epoll_event e;
6289
6290 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6291
6292 // running a bunch of iptables commands is slow and can cause
6293 // the master to drop tunnels on takeover--kludge around the
6294 // problem by forking for the moment (note: race)
6295 if (!fork_and_close())
6296 {
6297 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6298 {
6299 if (!session[s].opened) // Not an in-use session.
6300 continue;
6301
6302 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6303 }
6304 exit(0);
6305 }
6306
6307 // add radius fds
6308 e.events = EPOLLIN;
6309 for (i = 0; i < RADIUS_FDS; i++)
6310 {
6311 d[i].type = FD_TYPE_RADIUS;
6312 d[i].index = i;
6313 e.data.ptr = &d[i];
6314
6315 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6316 }
6317 }
6318
6319 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6320 {
6321 int s, i;
6322 int count = 0;
6323 int buckets[64];
6324
6325 if (CLI_HELP_REQUESTED)
6326 return CLI_HELP_NO_ARGS;
6327
6328 time(&time_now);
6329 for (i = 0; i < 64;++i) buckets[i] = 0;
6330
6331 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6332 {
6333 int idle;
6334 if (!session[s].opened)
6335 continue;
6336
6337 idle = time_now - session[s].last_data;
6338 idle /= 5 ; // In multiples of 5 seconds.
6339 if (idle < 0)
6340 idle = 0;
6341 if (idle > 63)
6342 idle = 63;
6343
6344 ++count;
6345 ++buckets[idle];
6346 }
6347
6348 for (i = 0; i < 63; ++i)
6349 {
6350 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6351 }
6352 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6353 cli_print(cli, "%d total sessions open.", count);
6354 return CLI_OK;
6355 }
6356
6357 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6358 {
6359 int s, i;
6360 int count = 0;
6361 int buckets[64];
6362
6363 if (CLI_HELP_REQUESTED)
6364 return CLI_HELP_NO_ARGS;
6365
6366 time(&time_now);
6367 for (i = 0; i < 64;++i) buckets[i] = 0;
6368
6369 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6370 {
6371 int open = 0, d;
6372 if (!session[s].opened)
6373 continue;
6374
6375 d = time_now - session[s].opened;
6376 if (d < 0)
6377 d = 0;
6378 while (d > 1 && open < 32)
6379 {
6380 ++open;
6381 d >>= 1; // half.
6382 }
6383 ++count;
6384 ++buckets[open];
6385 }
6386
6387 s = 1;
6388 for (i = 0; i < 30; ++i)
6389 {
6390 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6391 s <<= 1;
6392 }
6393 cli_print(cli, "%d total sessions open.", count);
6394 return CLI_OK;
6395 }
6396
6397 /* Unhide an avp.
6398 *
6399 * This unencodes the AVP using the L2TP secret and the previously
6400 * stored random vector. It overwrites the hidden data with the
6401 * unhidden AVP subformat.
6402 */
6403 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6404 {
6405 MD5_CTX ctx;
6406 uint8_t digest[16];
6407 uint8_t *last;
6408 size_t d = 0;
6409 uint16_t m = htons(type);
6410
6411 // Compute initial pad
6412 MD5_Init(&ctx);
6413 MD5_Update(&ctx, (unsigned char *) &m, 2);
6414 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6415 MD5_Update(&ctx, vector, vec_len);
6416 MD5_Final(digest, &ctx);
6417
6418 // pointer to last decoded 16 octets
6419 last = value;
6420
6421 while (len > 0)
6422 {
6423 // calculate a new pad based on the last decoded block
6424 if (d >= sizeof(digest))
6425 {
6426 MD5_Init(&ctx);
6427 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6428 MD5_Update(&ctx, last, sizeof(digest));
6429 MD5_Final(digest, &ctx);
6430
6431 d = 0;
6432 last = value;
6433 }
6434
6435 *value++ ^= digest[d++];
6436 len--;
6437 }
6438 }
6439
6440 int find_filter(char const *name, size_t len)
6441 {
6442 int free = -1;
6443 int i;
6444
6445 for (i = 0; i < MAXFILTER; i++)
6446 {
6447 if (!*ip_filters[i].name)
6448 {
6449 if (free < 0)
6450 free = i;
6451
6452 continue;
6453 }
6454
6455 if (strlen(ip_filters[i].name) != len)
6456 continue;
6457
6458 if (!strncmp(ip_filters[i].name, name, len))
6459 return i;
6460 }
6461
6462 return free;
6463 }
6464
6465 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6466 {
6467 switch (p->op)
6468 {
6469 case FILTER_PORT_OP_EQ: return port == p->port;
6470 case FILTER_PORT_OP_NEQ: return port != p->port;
6471 case FILTER_PORT_OP_GT: return port > p->port;
6472 case FILTER_PORT_OP_LT: return port < p->port;
6473 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6474 }
6475
6476 return 0;
6477 }
6478
6479 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6480 {
6481 switch (op)
6482 {
6483 case FILTER_FLAG_OP_ANY:
6484 return (flags & sflags) || (~flags & cflags);
6485
6486 case FILTER_FLAG_OP_ALL:
6487 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6488
6489 case FILTER_FLAG_OP_EST:
6490 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6491 }
6492
6493 return 0;
6494 }
6495
6496 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6497 {
6498 uint16_t frag_offset;
6499 uint8_t proto;
6500 in_addr_t src_ip;
6501 in_addr_t dst_ip;
6502 uint16_t src_port = 0;
6503 uint16_t dst_port = 0;
6504 uint8_t flags = 0;
6505 ip_filter_rulet *rule;
6506
6507 if (len < 20) // up to end of destination address
6508 return 0;
6509
6510 if ((*buf >> 4) != 4) // IPv4
6511 return 0;
6512
6513 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6514 proto = buf[9];
6515 src_ip = *(in_addr_t *) (buf + 12);
6516 dst_ip = *(in_addr_t *) (buf + 16);
6517
6518 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6519 {
6520 int l = (buf[0] & 0xf) * 4; // length of IP header
6521 if (len < l + 4) // ports
6522 return 0;
6523
6524 src_port = ntohs(*(uint16_t *) (buf + l));
6525 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6526 if (proto == IPPROTO_TCP)
6527 {
6528 if (len < l + 14) // flags
6529 return 0;
6530
6531 flags = buf[l + 13] & 0x3f;
6532 }
6533 }
6534
6535 for (rule = ip_filters[filter].rules; rule->action; rule++)
6536 {
6537 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6538 continue;
6539
6540 if (rule->src_wild != INADDR_BROADCAST &&
6541 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6542 continue;
6543
6544 if (rule->dst_wild != INADDR_BROADCAST &&
6545 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6546 continue;
6547
6548 if (frag_offset)
6549 {
6550 // layer 4 deny rules are skipped
6551 if (rule->action == FILTER_ACTION_DENY &&
6552 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6553 continue;
6554 }
6555 else
6556 {
6557 if (rule->frag)
6558 continue;
6559
6560 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6561 {
6562 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6563 continue;
6564
6565 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6566 continue;
6567
6568 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6569 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6570 continue;
6571 }
6572 }
6573
6574 // matched
6575 rule->counter++;
6576 return rule->action == FILTER_ACTION_PERMIT;
6577 }
6578
6579 // default deny
6580 return 0;
6581 }
6582
6583 tunnelidt lac_new_tunnel()
6584 {
6585 return new_tunnel();
6586 }
6587
6588 void lac_tunnelclear(tunnelidt t)
6589 {
6590 tunnelclear(t);
6591 }
6592
6593 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6594 {
6595 uint16_t version = 0x0100; // protocol version
6596
6597 tunnel[t].state = TUNNELOPENING;
6598
6599 // Sent SCCRQ - Start Control Connection Request
6600 controlt *c = controlnew(1); // sending SCCRQ
6601 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6602 controls(c, 8, Vendor_name, 1); // Vendor name
6603 control16(c, 2, version, 1); // protocol version
6604 control32(c, 3, 3, 1); // framing Capabilities
6605 control16(c, 9, t, 1); // assigned tunnel
6606 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6607 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6608 controladd(c, 0, t); // send
6609 }
6610
6611 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6612 {
6613 // Sent ICRQ Incoming-call-request
6614 controlt *c = controlnew(10); // ICRQ
6615
6616 control16(c, 14, s, 1); // assigned sesion
6617 call_serial_number++;
6618 control32(c, 15, call_serial_number, 1); // call serial number
6619 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6620 controladd(c, 0, t); // send
6621 }
6622
6623 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6624 {
6625 tunnelshutdown(t, reason, result, error, msg);
6626 }
6627