f81a43ed357104fd588f9578e8556dcccc232efd
[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 static 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 {
96 sessionidt sess;
97 union iphash *idx;
98 } ip_hash[256]; // Mapping from IP address to session structures.
99
100 struct ipv6radix {
101 sessionidt sess;
102 struct ipv6radix *branch;
103 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
104
105 // Traffic counters.
106 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
107 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
108 uint32_t eth_tx = 0;
109
110 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
111 time_t time_now = 0; // Current time in seconds since epoch.
112 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
113 static char time_now_string[64] = {0}; // Current time as a string.
114 static int time_changed = 0; // time_now changed
115 char main_quit = 0; // True if we're in the process of exiting.
116 static char main_reload = 0; // Re-load pending
117 linked_list *loaded_plugins;
118 linked_list *plugins[MAX_PLUGIN_TYPES];
119
120 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
121 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
122
123 config_descriptt config_values[] = {
124 CONFIG("debug", debug, INT),
125 CONFIG("log_file", log_filename, STRING),
126 CONFIG("pid_file", pid_file, STRING),
127 CONFIG("random_device", random_device, STRING),
128 CONFIG("l2tp_secret", l2tp_secret, STRING),
129 CONFIG("l2tp_mtu", l2tp_mtu, INT),
130 CONFIG("ppp_restart_time", ppp_restart_time, INT),
131 CONFIG("ppp_max_configure", ppp_max_configure, INT),
132 CONFIG("ppp_max_failure", ppp_max_failure, INT),
133 CONFIG("primary_dns", default_dns1, IPv4),
134 CONFIG("secondary_dns", default_dns2, IPv4),
135 CONFIG("primary_radius", radiusserver[0], IPv4),
136 CONFIG("secondary_radius", radiusserver[1], IPv4),
137 CONFIG("primary_radius_port", radiusport[0], SHORT),
138 CONFIG("secondary_radius_port", radiusport[1], SHORT),
139 CONFIG("radius_accounting", radius_accounting, BOOL),
140 CONFIG("radius_interim", radius_interim, INT),
141 CONFIG("radius_secret", radiussecret, STRING),
142 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
143 CONFIG("radius_dae_port", radius_dae_port, SHORT),
144 CONFIG("radius_bind_min", radius_bind_min, SHORT),
145 CONFIG("radius_bind_max", radius_bind_max, SHORT),
146 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
147 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
148 CONFIG("guest_account", guest_user, STRING),
149 CONFIG("bind_address", bind_address, IPv4),
150 CONFIG("peer_address", peer_address, IPv4),
151 CONFIG("send_garp", send_garp, BOOL),
152 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
153 CONFIG("throttle_buckets", num_tbfs, INT),
154 CONFIG("accounting_dir", accounting_dir, STRING),
155 CONFIG("account_all_origin", account_all_origin, BOOL),
156 CONFIG("dump_speed", dump_speed, BOOL),
157 CONFIG("multi_read_count", multi_read_count, INT),
158 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
159 CONFIG("lock_pages", lock_pages, BOOL),
160 CONFIG("icmp_rate", icmp_rate, INT),
161 CONFIG("packet_limit", max_packets, INT),
162 CONFIG("cluster_address", cluster_address, IPv4),
163 CONFIG("cluster_interface", cluster_interface, STRING),
164 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
165 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
166 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
167 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
168 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
169 CONFIG("cli_bind_address", cli_bind_address, IPv4),
170 CONFIG("hostname", hostname, STRING),
171 #ifdef BGP
172 CONFIG("nexthop_address", nexthop_address, IPv4),
173 CONFIG("nexthop6_address", nexthop6_address, IPv6),
174 #endif
175 CONFIG("echo_timeout", echo_timeout, INT),
176 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
177 CONFIG("iftun_address", iftun_address, IPv4),
178 CONFIG("tundevicename", tundevicename, STRING),
179 CONFIG("disable_lac_func", disable_lac_func, BOOL),
180 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
181 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
182 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
183 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
184 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
185 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
186 CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
187 CONFIG("disable_no_spoof", disable_no_spoof, BOOL),
188 CONFIG("bind_multi_address", bind_multi_address, STRING),
189 CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name, BOOL),
190 { NULL, 0, 0, 0 }
191 };
192
193 static char *plugin_functions[] = {
194 NULL,
195 "plugin_pre_auth",
196 "plugin_post_auth",
197 "plugin_timer",
198 "plugin_new_session",
199 "plugin_kill_session",
200 "plugin_control",
201 "plugin_radius_response",
202 "plugin_radius_reset",
203 "plugin_radius_account",
204 "plugin_become_master",
205 "plugin_new_session_master",
206 };
207
208 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
209
210 // Counters for shutdown sessions
211 static sessiont shut_acct[8192];
212 static sessionidt shut_acct_n = 0;
213
214 tunnelt *tunnel = NULL; // Array of tunnel structures.
215 bundlet *bundle = NULL; // Array of bundle structures.
216 fragmentationt *frag = NULL; // Array of fragmentation structures.
217 sessiont *session = NULL; // Array of session 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 ssize_t netlink_send(struct nlmsghdr *nh);
229 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
230 static void cache_ipmap(in_addr_t ip, sessionidt s);
231 static void uncache_ipmap(in_addr_t ip);
232 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
233 static void free_ip_address(sessionidt s);
234 static void dump_acct_info(int all);
235 static void sighup_handler(int sig);
236 static void shutdown_handler(int sig);
237 static void sigchild_handler(int sig);
238 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
239 static void update_config(void);
240 static void read_config_file(void);
241 static void initplugins(void);
242 static int add_plugin(char *plugin_name);
243 static int remove_plugin(char *plugin_name);
244 static void plugins_done(void);
245 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
246 static tunnelidt new_tunnel(void);
247 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
248 static void bundleclear(bundleidt b);
249
250 // return internal time (10ths since process startup), set f if given
251 // as a side-effect sets time_now, and time_changed
252 static clockt now(double *f)
253 {
254 struct timeval t;
255 gettimeofday(&t, 0);
256 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
257 if (t.tv_sec != time_now)
258 {
259 time_now = t.tv_sec;
260 time_changed++;
261 }
262
263 // Time in milliseconds
264 // TODO FOR MLPPP DEV
265 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
266
267 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
268 }
269
270 // work out a retry time based on try number
271 // This is a straight bounded exponential backoff.
272 // Maximum re-try time is 32 seconds. (2^5).
273 clockt backoff(uint8_t try)
274 {
275 if (try > 5) try = 5; // max backoff
276 return now(NULL) + 10 * (1 << try);
277 }
278
279
280 //
281 // Log a debug message. Typically called via the LOG macro
282 //
283 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
284 {
285 static char message[65536] = {0};
286 va_list ap;
287
288 #ifdef RINGBUFFER
289 if (ringbuffer)
290 {
291 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
292 ringbuffer->tail = 0;
293 if (ringbuffer->tail == ringbuffer->head)
294 if (++ringbuffer->head >= RINGBUFFER_SIZE)
295 ringbuffer->head = 0;
296
297 ringbuffer->buffer[ringbuffer->tail].level = level;
298 ringbuffer->buffer[ringbuffer->tail].session = s;
299 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
300 va_start(ap, format);
301 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
302 va_end(ap);
303 }
304 #endif
305
306 if (config->debug < level) return;
307
308 va_start(ap, format);
309 vsnprintf(message, sizeof(message), format, ap);
310
311 if (log_stream)
312 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
313 else if (syslog_log)
314 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
315
316 va_end(ap);
317 }
318
319 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
320 {
321 int i, j;
322 const uint8_t *d = data;
323
324 if (config->debug < level) return;
325
326 // No support for _log_hex to syslog
327 if (log_stream)
328 {
329 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
330 setvbuf(log_stream, NULL, _IOFBF, 16384);
331
332 for (i = 0; i < maxsize; )
333 {
334 fprintf(log_stream, "%4X: ", i);
335 for (j = i; j < maxsize && j < (i + 16); j++)
336 {
337 fprintf(log_stream, "%02X ", d[j]);
338 if (j == i + 7)
339 fputs(": ", log_stream);
340 }
341
342 for (; j < i + 16; j++)
343 {
344 fputs(" ", log_stream);
345 if (j == i + 7)
346 fputs(": ", log_stream);
347 }
348
349 fputs(" ", log_stream);
350 for (j = i; j < maxsize && j < (i + 16); j++)
351 {
352 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
353 fputc(d[j], log_stream);
354 else
355 fputc('.', log_stream);
356
357 if (j == i + 7)
358 fputs(" ", log_stream);
359 }
360
361 i = j;
362 fputs("\n", log_stream);
363 }
364
365 fflush(log_stream);
366 setbuf(log_stream, NULL);
367 }
368 }
369
370 // update a counter, accumulating 2^32 wraps
371 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
372 {
373 uint32_t new = *counter + delta;
374 if (new < *counter)
375 (*wrap)++;
376
377 *counter = new;
378 }
379
380 // initialise the random generator
381 static void initrandom(char *source)
382 {
383 static char path[sizeof(config->random_device)] = "*undefined*";
384
385 // reinitialise only if we are forced to do so or if the config has changed
386 if (source && !strncmp(path, source, sizeof(path)))
387 return;
388
389 // close previous source, if any
390 if (rand_fd >= 0)
391 close(rand_fd);
392
393 rand_fd = -1;
394
395 if (source)
396 {
397 // register changes
398 snprintf(path, sizeof(path), "%s", source);
399
400 if (*path == '/')
401 {
402 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
403 if (rand_fd < 0)
404 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
405 path, strerror(errno));
406 }
407 }
408 }
409
410 // fill buffer with random data
411 void random_data(uint8_t *buf, int len)
412 {
413 int n = 0;
414
415 CSTAT(random_data);
416 if (rand_fd >= 0)
417 {
418 n = read(rand_fd, buf, len);
419 if (n >= len) return;
420 if (n < 0)
421 {
422 if (errno != EAGAIN)
423 {
424 LOG(0, 0, 0, "Error reading from random source: %s\n",
425 strerror(errno));
426
427 // fall back to rand()
428 initrandom(NULL);
429 }
430
431 n = 0;
432 }
433 }
434
435 // append missing data
436 while (n < len)
437 // not using the low order bits from the prng stream
438 buf[n++] = (rand() >> 4) & 0xff;
439 }
440
441 // Add a route
442 //
443 // This adds it to the routing table, advertises it
444 // via BGP if enabled, and stuffs it into the
445 // 'sessionbyip' cache.
446 //
447 // 'ip' must be in _host_ order.
448 //
449 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
450 {
451 struct {
452 struct nlmsghdr nh;
453 struct rtmsg rt;
454 char buf[32];
455 } req;
456 int i;
457 in_addr_t n_ip;
458
459 if (!prefixlen) prefixlen = 32;
460
461 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
462
463 memset(&req, 0, sizeof(req));
464
465 if (add)
466 {
467 req.nh.nlmsg_type = RTM_NEWROUTE;
468 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
469 }
470 else
471 {
472 req.nh.nlmsg_type = RTM_DELROUTE;
473 req.nh.nlmsg_flags = NLM_F_REQUEST;
474 }
475
476 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
477
478 req.rt.rtm_family = AF_INET;
479 req.rt.rtm_dst_len = prefixlen;
480 req.rt.rtm_table = RT_TABLE_MAIN;
481 req.rt.rtm_protocol = 42;
482 req.rt.rtm_scope = RT_SCOPE_LINK;
483 req.rt.rtm_type = RTN_UNICAST;
484
485 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
486 n_ip = htonl(ip);
487 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
488 if (gw)
489 {
490 n_ip = htonl(gw);
491 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
492 }
493
494 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
495 fmtaddr(htonl(ip), 0), prefixlen,
496 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
497
498 if (netlink_send(&req.nh) < 0)
499 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
500
501 #ifdef BGP
502 if (add)
503 bgp_add_route(htonl(ip), prefixlen);
504 else
505 bgp_del_route(htonl(ip), prefixlen);
506 #endif /* BGP */
507
508 // Add/Remove the IPs to the 'sessionbyip' cache.
509 // Note that we add the zero address in the case of
510 // a network route. Roll on CIDR.
511
512 // Note that 's == 0' implies this is the address pool.
513 // We still cache it here, because it will pre-fill
514 // the malloc'ed tree.
515
516 if (s)
517 {
518 if (!add) // Are we deleting a route?
519 s = 0; // Caching the session as '0' is the same as uncaching.
520
521 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
522 cache_ipmap(i, s);
523 }
524 }
525
526 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
527 {
528 struct {
529 struct nlmsghdr nh;
530 struct rtmsg rt;
531 char buf[64];
532 } req;
533 int metric;
534 char ipv6addr[INET6_ADDRSTRLEN];
535
536 if (!config->ipv6_prefix.s6_addr[0])
537 {
538 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
539 return;
540 }
541
542 memset(&req, 0, sizeof(req));
543
544 if (add)
545 {
546 req.nh.nlmsg_type = RTM_NEWROUTE;
547 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
548 }
549 else
550 {
551 req.nh.nlmsg_type = RTM_DELROUTE;
552 req.nh.nlmsg_flags = NLM_F_REQUEST;
553 }
554
555 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
556
557 req.rt.rtm_family = AF_INET6;
558 req.rt.rtm_dst_len = prefixlen;
559 req.rt.rtm_table = RT_TABLE_MAIN;
560 req.rt.rtm_protocol = 42;
561 req.rt.rtm_scope = RT_SCOPE_LINK;
562 req.rt.rtm_type = RTN_UNICAST;
563
564 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
565 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
566 metric = 1;
567 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
568
569 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
570 add ? "add" : "del",
571 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
572 prefixlen);
573
574 if (netlink_send(&req.nh) < 0)
575 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
576
577 #ifdef BGP
578 if (add)
579 bgp_add_route6(ip, prefixlen);
580 else
581 bgp_del_route6(ip, prefixlen);
582 #endif /* BGP */
583
584 if (s)
585 {
586 if (!add) // Are we deleting a route?
587 s = 0; // Caching the session as '0' is the same as uncaching.
588
589 cache_ipv6map(ip, prefixlen, s);
590 }
591
592 return;
593 }
594
595 //
596 // Set up netlink socket
597 static void initnetlink(void)
598 {
599 struct sockaddr_nl nladdr;
600
601 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
602 if (nlfd < 0)
603 {
604 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
605 exit(1);
606 }
607
608 memset(&nladdr, 0, sizeof(nladdr));
609 nladdr.nl_family = AF_NETLINK;
610 nladdr.nl_pid = getpid();
611
612 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
613 {
614 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
615 exit(1);
616 }
617 }
618
619 static ssize_t netlink_send(struct nlmsghdr *nh)
620 {
621 struct sockaddr_nl nladdr;
622 struct iovec iov;
623 struct msghdr msg;
624
625 nh->nlmsg_pid = getpid();
626 nh->nlmsg_seq = ++nlseqnum;
627
628 // set kernel address
629 memset(&nladdr, 0, sizeof(nladdr));
630 nladdr.nl_family = AF_NETLINK;
631
632 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
633 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
634
635 return sendmsg(nlfd, &msg, 0);
636 }
637
638 static ssize_t netlink_recv(void *buf, ssize_t len)
639 {
640 struct sockaddr_nl nladdr;
641 struct iovec iov;
642 struct msghdr msg;
643
644 // set kernel address
645 memset(&nladdr, 0, sizeof(nladdr));
646 nladdr.nl_family = AF_NETLINK;
647
648 iov = (struct iovec){ buf, len };
649 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
650
651 return recvmsg(nlfd, &msg, 0);
652 }
653
654 /* adapted from iproute2 */
655 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
656 {
657 int len = RTA_LENGTH(alen);
658 struct rtattr *rta;
659
660 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
661 rta->rta_type = type;
662 rta->rta_len = len;
663 memcpy(RTA_DATA(rta), data, alen);
664 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
665 }
666
667 // messages corresponding to different phases seq number
668 static char *tun_nl_phase_msg[] = {
669 "initialized",
670 "getting tun interface index",
671 "setting tun interface parameters",
672 "setting tun IPv4 address",
673 "setting tun LL IPv6 address",
674 "setting tun global IPv6 address",
675 };
676
677 //
678 // Set up TUN interface
679 static void inittun(void)
680 {
681 struct ifreq ifr;
682
683 memset(&ifr, 0, sizeof(ifr));
684 ifr.ifr_flags = IFF_TUN;
685
686 tunfd = open(TUNDEVICE, O_RDWR);
687 if (tunfd < 0)
688 { // fatal
689 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
690 exit(1);
691 }
692 {
693 int flags = fcntl(tunfd, F_GETFL, 0);
694 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
695 }
696
697 if (*config->tundevicename)
698 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
699
700 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
701 {
702 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
703 exit(1);
704 }
705 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
706 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
707
708 tunidx = if_nametoindex(config->tundevicename);
709 if (tunidx == 0)
710 {
711 LOG(0, 0, 0, "Can't get tun interface index\n");
712 exit(1);
713 }
714
715 {
716 struct {
717 // interface setting
718 struct nlmsghdr nh;
719 union {
720 struct ifinfomsg ifinfo;
721 struct ifaddrmsg ifaddr;
722 } ifmsg;
723 char rtdata[32]; // 32 should be enough
724 } req;
725 uint32_t txqlen, mtu;
726 in_addr_t ip;
727
728 memset(&req, 0, sizeof(req));
729
730 req.nh.nlmsg_type = RTM_NEWLINK;
731 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
732 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
733
734 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
735 req.ifmsg.ifinfo.ifi_index = tunidx;
736 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
737 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
738
739 /* Bump up the qlen to deal with bursts from the network */
740 txqlen = 1000;
741 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
742 /* set MTU to modem MRU */
743 mtu = MRU;
744 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
745
746 if (netlink_send(&req.nh) < 0)
747 goto senderror;
748
749 memset(&req, 0, sizeof(req));
750
751 req.nh.nlmsg_type = RTM_NEWADDR;
752 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
753 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
754
755 req.ifmsg.ifaddr.ifa_family = AF_INET;
756 req.ifmsg.ifaddr.ifa_prefixlen = 32;
757 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
758 req.ifmsg.ifaddr.ifa_index = tunidx;
759
760 if (config->nbmultiaddress > 1)
761 {
762 int i;
763 for (i = 0; i < config->nbmultiaddress ; i++)
764 {
765 ip = config->iftun_n_address[i];
766 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
767 if (netlink_send(&req.nh) < 0)
768 goto senderror;
769 }
770 }
771 else
772 {
773 if (config->iftun_address)
774 ip = config->iftun_address;
775 else
776 ip = 0x01010101; // 1.1.1.1
777 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
778
779 if (netlink_send(&req.nh) < 0)
780 goto senderror;
781 }
782
783
784
785 // Only setup IPv6 on the tun device if we have a configured prefix
786 if (config->ipv6_prefix.s6_addr[0]) {
787 struct in6_addr ip6;
788
789 memset(&req, 0, sizeof(req));
790
791 req.nh.nlmsg_type = RTM_NEWADDR;
792 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
793 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
794
795 req.ifmsg.ifaddr.ifa_family = AF_INET6;
796 req.ifmsg.ifaddr.ifa_prefixlen = 64;
797 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
798 req.ifmsg.ifaddr.ifa_index = tunidx;
799
800 // Link local address is FE80::1
801 memset(&ip6, 0, sizeof(ip6));
802 ip6.s6_addr[0] = 0xFE;
803 ip6.s6_addr[1] = 0x80;
804 ip6.s6_addr[15] = 1;
805 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
806
807 if (netlink_send(&req.nh) < 0)
808 goto senderror;
809
810 memset(&req, 0, sizeof(req));
811
812 req.nh.nlmsg_type = RTM_NEWADDR;
813 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
814 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
815
816 req.ifmsg.ifaddr.ifa_family = AF_INET6;
817 req.ifmsg.ifaddr.ifa_prefixlen = 64;
818 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
819 req.ifmsg.ifaddr.ifa_index = tunidx;
820
821 // Global address is prefix::1
822 ip6 = config->ipv6_prefix;
823 ip6.s6_addr[15] = 1;
824 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
825
826 if (netlink_send(&req.nh) < 0)
827 goto senderror;
828 }
829
830 memset(&req, 0, sizeof(req));
831
832 req.nh.nlmsg_type = NLMSG_DONE;
833 req.nh.nlmsg_len = NLMSG_LENGTH(0);
834
835 if (netlink_send(&req.nh) < 0)
836 goto senderror;
837
838 // if we get an error for seqnum < min_initok_nlseqnum,
839 // we must exit as initialization went wrong
840 if (config->ipv6_prefix.s6_addr[0])
841 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
842 else
843 min_initok_nlseqnum = 3 + 1; // idx + if + addr
844 }
845
846 return;
847
848 senderror:
849 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
850 exit(1);
851 }
852
853 // set up LAC UDP ports
854 static void initlacudp(void)
855 {
856 int on = 1;
857 struct sockaddr_in addr;
858
859 // Tunnel to Remote LNS
860 memset(&addr, 0, sizeof(addr));
861 addr.sin_family = AF_INET;
862 addr.sin_port = htons(config->bind_portremotelns);
863 addr.sin_addr.s_addr = config->bind_address_remotelns;
864 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
865 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
866 {
867 int flags = fcntl(udplacfd, F_GETFL, 0);
868 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
869 }
870 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
871 {
872 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
873 exit(1);
874 }
875 }
876
877 // set up control ports
878 static void initcontrol(void)
879 {
880 int on = 1;
881 struct sockaddr_in addr;
882
883 // Control
884 memset(&addr, 0, sizeof(addr));
885 addr.sin_family = AF_INET;
886 addr.sin_port = htons(NSCTL_PORT);
887 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
888 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
889 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
890 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
891 {
892 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
893 exit(1);
894 }
895 }
896
897 // set up Dynamic Authorization Extensions to RADIUS port
898 static void initdae(void)
899 {
900 int on = 1;
901 struct sockaddr_in addr;
902
903 // Dynamic Authorization Extensions to RADIUS
904 memset(&addr, 0, sizeof(addr));
905 addr.sin_family = AF_INET;
906 addr.sin_port = htons(config->radius_dae_port);
907 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
908 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
909 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
910 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
911 {
912 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
913 exit(1);
914 }
915 }
916
917 // set up UDP ports
918 static void initudp(int * pudpfd, in_addr_t ip_bind)
919 {
920 int on = 1;
921 struct sockaddr_in addr;
922
923 // Tunnel
924 memset(&addr, 0, sizeof(addr));
925 addr.sin_family = AF_INET;
926 addr.sin_port = htons(L2TPPORT);
927 addr.sin_addr.s_addr = ip_bind;
928 (*pudpfd) = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
929 setsockopt((*pudpfd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
930 {
931 int flags = fcntl((*pudpfd), F_GETFL, 0);
932 fcntl((*pudpfd), F_SETFL, flags | O_NONBLOCK);
933 }
934 if (bind((*pudpfd), (struct sockaddr *) &addr, sizeof(addr)) < 0)
935 {
936 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
937 exit(1);
938 }
939 }
940
941 //
942 // Find session by IP, < 1 for not found
943 //
944 // Confusingly enough, this 'ip' must be
945 // in _network_ order. This being the common
946 // case when looking it up from IP packet headers.
947 //
948 // We actually use this cache for two things.
949 // #1. For used IP addresses, this maps to the
950 // session ID that it's used by.
951 // #2. For un-used IP addresses, this maps to the
952 // index into the pool table that contains that
953 // IP address.
954 //
955
956 static sessionidt lookup_ipmap(in_addr_t ip)
957 {
958 uint8_t *a = (uint8_t *) &ip;
959 union iphash *h = ip_hash;
960
961 if (!(h = h[*a++].idx)) return 0;
962 if (!(h = h[*a++].idx)) return 0;
963 if (!(h = h[*a++].idx)) return 0;
964
965 return h[*a].sess;
966 }
967
968 static sessionidt lookup_ipv6map(struct in6_addr ip)
969 {
970 struct ipv6radix *curnode;
971 int i;
972 int s;
973 char ipv6addr[INET6_ADDRSTRLEN];
974
975 curnode = &ipv6_hash[ip.s6_addr[0]];
976 i = 1;
977 s = curnode->sess;
978
979 while (s == 0 && i < 15 && curnode->branch != NULL)
980 {
981 curnode = &curnode->branch[ip.s6_addr[i]];
982 s = curnode->sess;
983 i++;
984 }
985
986 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
987 inet_ntop(AF_INET6, &ip, ipv6addr,
988 INET6_ADDRSTRLEN),
989 s);
990
991 return s;
992 }
993
994 sessionidt sessionbyip(in_addr_t ip)
995 {
996 sessionidt s = lookup_ipmap(ip);
997 CSTAT(sessionbyip);
998
999 if (s > 0 && s < MAXSESSION && session[s].opened)
1000 return s;
1001
1002 return 0;
1003 }
1004
1005 sessionidt sessionbyipv6(struct in6_addr ip)
1006 {
1007 sessionidt s;
1008 CSTAT(sessionbyipv6);
1009
1010 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
1011 (ip.s6_addr[0] == 0xFE &&
1012 ip.s6_addr[1] == 0x80 &&
1013 ip.s6_addr16[1] == 0 &&
1014 ip.s6_addr16[2] == 0 &&
1015 ip.s6_addr16[3] == 0)) {
1016 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
1017 } else {
1018 s = lookup_ipv6map(ip);
1019 }
1020
1021 if (s > 0 && s < MAXSESSION && session[s].opened)
1022 return s;
1023
1024 return 0;
1025 }
1026
1027 //
1028 // Take an IP address in HOST byte order and
1029 // add it to the sessionid by IP cache.
1030 //
1031 // (It's actually cached in network order)
1032 //
1033 static void cache_ipmap(in_addr_t ip, sessionidt s)
1034 {
1035 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1036 uint8_t *a = (uint8_t *) &nip;
1037 union iphash *h = ip_hash;
1038 int i;
1039
1040 for (i = 0; i < 3; i++)
1041 {
1042 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1043 return;
1044
1045 h = h[a[i]].idx;
1046 }
1047
1048 h[a[3]].sess = s;
1049
1050 if (s > 0)
1051 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1052
1053 else if (s == 0)
1054 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1055 // else a map to an ip pool index.
1056 }
1057
1058 static void uncache_ipmap(in_addr_t ip)
1059 {
1060 cache_ipmap(ip, 0); // Assign it to the NULL session.
1061 }
1062
1063 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1064 {
1065 int i;
1066 int bytes;
1067 struct ipv6radix *curnode;
1068 char ipv6addr[INET6_ADDRSTRLEN];
1069
1070 curnode = &ipv6_hash[ip.s6_addr[0]];
1071
1072 bytes = prefixlen >> 3;
1073 i = 1;
1074 while (i < bytes) {
1075 if (curnode->branch == NULL)
1076 {
1077 if (!(curnode->branch = calloc(256,
1078 sizeof (struct ipv6radix))))
1079 return;
1080 }
1081 curnode = &curnode->branch[ip.s6_addr[i]];
1082 i++;
1083 }
1084
1085 curnode->sess = s;
1086
1087 if (s > 0)
1088 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1089 inet_ntop(AF_INET6, &ip, ipv6addr,
1090 INET6_ADDRSTRLEN),
1091 prefixlen);
1092 else if (s == 0)
1093 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1094 inet_ntop(AF_INET6, &ip, ipv6addr,
1095 INET6_ADDRSTRLEN),
1096 prefixlen);
1097 }
1098
1099 //
1100 // CLI list to dump current ipcache.
1101 //
1102 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1103 {
1104 union iphash *d = ip_hash, *e, *f, *g;
1105 int i, j, k, l;
1106 int count = 0;
1107
1108 if (CLI_HELP_REQUESTED)
1109 return CLI_HELP_NO_ARGS;
1110
1111 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1112
1113 for (i = 0; i < 256; ++i)
1114 {
1115 if (!d[i].idx)
1116 continue;
1117
1118 e = d[i].idx;
1119 for (j = 0; j < 256; ++j)
1120 {
1121 if (!e[j].idx)
1122 continue;
1123
1124 f = e[j].idx;
1125 for (k = 0; k < 256; ++k)
1126 {
1127 if (!f[k].idx)
1128 continue;
1129
1130 g = f[k].idx;
1131 for (l = 0; l < 256; ++l)
1132 {
1133 if (!g[l].sess)
1134 continue;
1135
1136 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1137 ++count;
1138 }
1139 }
1140 }
1141 }
1142 cli_print(cli, "%d entries in cache", count);
1143 return CLI_OK;
1144 }
1145
1146
1147 // Find session by username, 0 for not found
1148 // walled garden users aren't authenticated, so the username is
1149 // reasonably useless. Ignore them to avoid incorrect actions
1150 //
1151 // This is VERY inefficent. Don't call it often. :)
1152 //
1153 sessionidt sessionbyuser(char *username)
1154 {
1155 int s;
1156 CSTAT(sessionbyuser);
1157
1158 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1159 {
1160 if (!session[s].opened)
1161 continue;
1162
1163 if (session[s].walled_garden)
1164 continue; // Skip walled garden users.
1165
1166 if (!strncmp(session[s].user, username, 128))
1167 return s;
1168
1169 }
1170 return 0; // Not found.
1171 }
1172
1173 void send_garp(in_addr_t ip)
1174 {
1175 int s;
1176 struct ifreq ifr;
1177 uint8_t mac[6];
1178
1179 s = socket(PF_INET, SOCK_DGRAM, 0);
1180 if (s < 0)
1181 {
1182 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1183 return;
1184 }
1185 memset(&ifr, 0, sizeof(ifr));
1186 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1187 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1188 {
1189 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1190 close(s);
1191 return;
1192 }
1193 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1194 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1195 {
1196 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1197 close(s);
1198 return;
1199 }
1200 close(s);
1201 sendarp(ifr.ifr_ifindex, mac, ip);
1202 }
1203
1204 static sessiont *sessiontbysessionidt(sessionidt s)
1205 {
1206 if (!s || s >= MAXSESSION) return NULL;
1207 return &session[s];
1208 }
1209
1210 static sessionidt sessionidtbysessiont(sessiont *s)
1211 {
1212 sessionidt val = s-session;
1213 if (s < session || val >= MAXSESSION) return 0;
1214 return val;
1215 }
1216
1217 // actually send a control message for a specific tunnel
1218 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1219 {
1220 struct sockaddr_in addr;
1221
1222 CSTAT(tunnelsend);
1223
1224 if (!t)
1225 {
1226 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1227 STAT(tunnel_tx_errors);
1228 return;
1229 }
1230
1231 if (t == TUNNEL_ID_PPPOE)
1232 {
1233 pppoe_sess_send(buf, l, t);
1234 return;
1235 }
1236
1237 if (!tunnel[t].ip)
1238 {
1239 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1240 STAT(tunnel_tx_errors);
1241 return;
1242 }
1243
1244 memset(&addr, 0, sizeof(addr));
1245 addr.sin_family = AF_INET;
1246 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1247 addr.sin_port = htons(tunnel[t].port);
1248
1249 // sequence expected, if sequence in message
1250 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1251
1252 // If this is a control message, deal with retries
1253 if (*buf & 0x80)
1254 {
1255 tunnel[t].last = time_now; // control message sent
1256 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1257 if (tunnel[t].try)
1258 {
1259 STAT(tunnel_retries);
1260 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1261 }
1262 }
1263
1264 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1265 {
1266 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1267 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1268 STAT(tunnel_tx_errors);
1269 return;
1270 }
1271
1272 LOG_HEX(5, "Send Tunnel Data", buf, l);
1273 STAT(tunnel_tx_packets);
1274 INC_STAT(tunnel_tx_bytes, l);
1275 }
1276
1277 //
1278 // Tiny helper function to write data to
1279 // the 'tun' device.
1280 //
1281 int tun_write(uint8_t * data, int size)
1282 {
1283 return write(tunfd, data, size);
1284 }
1285
1286 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1287 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1288 {
1289 int d = (tcp[12] >> 4) * 4;
1290 uint8_t *mss = 0;
1291 uint8_t *opts;
1292 uint8_t *data;
1293 uint16_t orig;
1294 uint32_t sum;
1295
1296 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1297 return;
1298
1299 if (tcp + d > buf + len) // short?
1300 return;
1301
1302 opts = tcp + 20;
1303 data = tcp + d;
1304
1305 while (opts < data)
1306 {
1307 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1308 {
1309 mss = opts + 2;
1310 if (mss + 2 > data) return; // short?
1311 break;
1312 }
1313
1314 if (*opts == 0) return; // end of options
1315 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1316 opts++;
1317 else
1318 opts += opts[1]; // skip over option
1319 }
1320
1321 if (!mss) return; // not found
1322 orig = ntohs(*(uint16_t *) mss);
1323
1324 if (orig <= MSS) return; // mss OK
1325
1326 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1327 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1328 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1329 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1330
1331 // set mss
1332 *(int16_t *) mss = htons(MSS);
1333
1334 // adjust checksum (see rfc1141)
1335 sum = orig + (~MSS & 0xffff);
1336 sum += ntohs(*(uint16_t *) (tcp + 16));
1337 sum = (sum & 0xffff) + (sum >> 16);
1338 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1339 }
1340
1341 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1342 {
1343 uint16_t proto;
1344 if (extra) {
1345 // Skip the four extra bytes
1346 p += 4;
1347 l -= 4;
1348 }
1349
1350 if (*p & 1)
1351 {
1352 proto = *p++;
1353 l--;
1354 }
1355 else
1356 {
1357 proto = ntohs(*(uint16_t *) p);
1358 p += 2;
1359 l -= 2;
1360 }
1361 if (proto == PPPIP)
1362 {
1363 if (session[s].die)
1364 {
1365 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1366 return; // closing session, PPP not processed
1367 }
1368 session[s].last_packet = session[s].last_data = time_now;
1369 processipin(s, t, p, l);
1370 }
1371 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1372 {
1373 if (session[s].die)
1374 {
1375 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1376 return; // closing session, PPP not processed
1377 }
1378
1379 session[s].last_packet = session[s].last_data = time_now;
1380 processipv6in(s, t, p, l);
1381 }
1382 else if (proto == PPPIPCP)
1383 {
1384 session[s].last_packet = session[s].last_data = time_now;
1385 processipcp(s, t, p, l);
1386 }
1387 else if (proto == PPPCCP)
1388 {
1389 session[s].last_packet = session[s].last_data = time_now;
1390 processccp(s, t, p, l);
1391 }
1392 else
1393 {
1394 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1395 }
1396 }
1397
1398 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1399 {
1400 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1401 sp->cout_delta += len;
1402 sp->pout++;
1403 sp->last_data = time_now;
1404
1405 sess_local[s].cout += len; // To send to master..
1406 sess_local[s].pout++;
1407 }
1408
1409 // process outgoing (to tunnel) IP
1410 //
1411 // (i.e. this routine writes to data[-8]).
1412 void processipout(uint8_t *buf, int len)
1413 {
1414 sessionidt s;
1415 sessiont *sp;
1416 tunnelidt t;
1417 in_addr_t ip;
1418
1419 uint8_t *data = buf; // Keep a copy of the originals.
1420 int size = len;
1421
1422 uint8_t fragbuf[MAXETHER + 20];
1423
1424 CSTAT(processipout);
1425
1426 if (len < MIN_IP_SIZE)
1427 {
1428 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1429 STAT(tun_rx_errors);
1430 return;
1431 }
1432 if (len >= MAXETHER)
1433 {
1434 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1435 STAT(tun_rx_errors);
1436 return;
1437 }
1438
1439 // Skip the tun header
1440 buf += 4;
1441 len -= 4;
1442
1443 // Got an IP header now
1444 if (*(uint8_t *)(buf) >> 4 != 4)
1445 {
1446 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1447 return;
1448 }
1449
1450 ip = *(uint32_t *)(buf + 16);
1451 if (!(s = sessionbyip(ip)))
1452 {
1453 // Is this a packet for a session that doesn't exist?
1454 static int rate = 0; // Number of ICMP packets we've sent this second.
1455 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1456
1457 if (last != time_now)
1458 {
1459 last = time_now;
1460 rate = 0;
1461 }
1462
1463 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1464 {
1465 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1466 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1467 config->bind_address ? config->bind_address : my_address, buf, len);
1468 }
1469 return;
1470 }
1471
1472 t = session[s].tunnel;
1473 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1474 {
1475 LOG(3, s, t, "Packet size more than session MRU\n");
1476 return;
1477 }
1478
1479 sp = &session[s];
1480
1481 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1482 if (config->max_packets > 0)
1483 {
1484 if (sess_local[s].last_packet_out == TIME)
1485 {
1486 int max = config->max_packets;
1487
1488 // All packets for throttled sessions are handled by the
1489 // master, so further limit by using the throttle rate.
1490 // A bit of a kludge, since throttle rate is in kbps,
1491 // but should still be generous given our average DSL
1492 // packet size is 200 bytes: a limit of 28kbps equates
1493 // to around 180 packets per second.
1494 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1495 max = sp->throttle_out;
1496
1497 if (++sess_local[s].packets_out > max)
1498 {
1499 sess_local[s].packets_dropped++;
1500 return;
1501 }
1502 }
1503 else
1504 {
1505 if (sess_local[s].packets_dropped)
1506 {
1507 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1508 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1509 sess_local[s].packets_dropped, sess_local[s].packets_out,
1510 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1511 sp->user);
1512 }
1513
1514 sess_local[s].last_packet_out = TIME;
1515 sess_local[s].packets_out = 1;
1516 sess_local[s].packets_dropped = 0;
1517 }
1518 }
1519
1520 // run access-list if any
1521 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1522 return;
1523
1524 // adjust MSS on SYN and SYN,ACK packets with options
1525 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1526 {
1527 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1528 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1529 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1530 }
1531
1532 if (sp->tbf_out)
1533 {
1534 // Are we throttling this session?
1535 if (config->cluster_iam_master)
1536 tbf_queue_packet(sp->tbf_out, data, size);
1537 else
1538 master_throttle_packet(sp->tbf_out, data, size);
1539 return;
1540 }
1541
1542 if (sp->walled_garden && !config->cluster_iam_master)
1543 {
1544 // We are walled-gardening this
1545 master_garden_packet(s, data, size);
1546 return;
1547 }
1548
1549 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1550 {
1551
1552 if (!config->cluster_iam_master)
1553 {
1554 // The MPPP packets must be managed by the Master.
1555 master_forward_mppp_packet(s, data, size);
1556 return;
1557 }
1558
1559 // Add on L2TP header
1560 sessionidt members[MAXBUNDLESES];
1561 bundleidt bid = session[s].bundle;
1562 bundlet *b = &bundle[bid];
1563 uint32_t num_of_links, nb_opened;
1564 int i;
1565
1566 num_of_links = b->num_of_links;
1567 nb_opened = 0;
1568 for (i = 0;i < num_of_links;i++)
1569 {
1570 s = b->members[i];
1571 if (session[s].ppp.lcp == Opened)
1572 {
1573 members[nb_opened] = s;
1574 nb_opened++;
1575 }
1576 }
1577
1578 if (nb_opened < 1)
1579 {
1580 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1581 return;
1582 }
1583
1584 num_of_links = nb_opened;
1585 b->current_ses = (b->current_ses + 1) % num_of_links;
1586 s = members[b->current_ses];
1587 t = session[s].tunnel;
1588 sp = &session[s];
1589 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1590
1591 if (num_of_links > 1)
1592 {
1593 if(len > MINFRAGLEN)
1594 {
1595 //for rotate traffic among the member links
1596 uint32_t divisor = num_of_links;
1597 if (divisor > 2)
1598 divisor = divisor/2 + (divisor & 1);
1599
1600 // Partition the packet to "num_of_links" fragments
1601 uint32_t fraglen = len / divisor;
1602 uint32_t last_fraglen = fraglen + len % divisor;
1603 uint32_t remain = len;
1604
1605 // send the first packet
1606 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1607 if (!p) return;
1608 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1609
1610 // statistics
1611 update_session_out_stat(s, sp, fraglen);
1612
1613 remain -= fraglen;
1614 while (remain > last_fraglen)
1615 {
1616 b->current_ses = (b->current_ses + 1) % num_of_links;
1617 s = members[b->current_ses];
1618 t = session[s].tunnel;
1619 sp = &session[s];
1620 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1621 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1622 if (!p) return;
1623 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1624 update_session_out_stat(s, sp, fraglen);
1625 remain -= fraglen;
1626 }
1627 // send the last fragment
1628 b->current_ses = (b->current_ses + 1) % num_of_links;
1629 s = members[b->current_ses];
1630 t = session[s].tunnel;
1631 sp = &session[s];
1632 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1633 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1634 if (!p) return;
1635 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1636 update_session_out_stat(s, sp, remain);
1637 if (remain != last_fraglen)
1638 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1639 }
1640 else
1641 {
1642 // Send it as one frame
1643 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1644 if (!p) return;
1645 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1646 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1647 update_session_out_stat(s, sp, len);
1648 }
1649 }
1650 else
1651 {
1652 // Send it as one frame (NO MPPP Frame)
1653 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1654 tunnelsend(p, len + (buf-p), t); // send it...
1655 update_session_out_stat(s, sp, len);
1656 }
1657 }
1658 else
1659 {
1660 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1661 tunnelsend(p, len + (buf-p), t); // send it...
1662 update_session_out_stat(s, sp, len);
1663 }
1664
1665 // Snooping this session, send it to intercept box
1666 if (sp->snoop_ip && sp->snoop_port)
1667 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1668
1669 udp_tx += len;
1670 }
1671
1672 // process outgoing (to tunnel) IPv6
1673 //
1674 static void processipv6out(uint8_t * buf, int len)
1675 {
1676 sessionidt s;
1677 sessiont *sp;
1678 tunnelidt t;
1679 in_addr_t ip;
1680 struct in6_addr ip6;
1681
1682 uint8_t *data = buf; // Keep a copy of the originals.
1683 int size = len;
1684
1685 uint8_t b[MAXETHER + 20];
1686
1687 CSTAT(processipv6out);
1688
1689 if (len < MIN_IP_SIZE)
1690 {
1691 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1692 STAT(tunnel_tx_errors);
1693 return;
1694 }
1695 if (len >= MAXETHER)
1696 {
1697 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1698 STAT(tunnel_tx_errors);
1699 return;
1700 }
1701
1702 // Skip the tun header
1703 buf += 4;
1704 len -= 4;
1705
1706 // Got an IP header now
1707 if (*(uint8_t *)(buf) >> 4 != 6)
1708 {
1709 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1710 return;
1711 }
1712
1713 ip6 = *(struct in6_addr *)(buf+24);
1714 s = sessionbyipv6(ip6);
1715
1716 if (s == 0)
1717 {
1718 ip = *(uint32_t *)(buf + 32);
1719 s = sessionbyip(ip);
1720 }
1721
1722 if (s == 0)
1723 {
1724 // Is this a packet for a session that doesn't exist?
1725 static int rate = 0; // Number of ICMP packets we've sent this second.
1726 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1727
1728 if (last != time_now)
1729 {
1730 last = time_now;
1731 rate = 0;
1732 }
1733
1734 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1735 {
1736 // FIXME: Should send icmp6 host unreachable
1737 }
1738 return;
1739 }
1740 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1741 {
1742 bundleidt bid = session[s].bundle;
1743 bundlet *b = &bundle[bid];
1744
1745 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1746 s = b->members[b->current_ses];
1747 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1748 }
1749 t = session[s].tunnel;
1750 sp = &session[s];
1751 sp->last_data = time_now;
1752
1753 // FIXME: add DoS prevention/filters?
1754
1755 if (sp->tbf_out)
1756 {
1757 // Are we throttling this session?
1758 if (config->cluster_iam_master)
1759 tbf_queue_packet(sp->tbf_out, data, size);
1760 else
1761 master_throttle_packet(sp->tbf_out, data, size);
1762 return;
1763 }
1764 else if (sp->walled_garden && !config->cluster_iam_master)
1765 {
1766 // We are walled-gardening this
1767 master_garden_packet(s, data, size);
1768 return;
1769 }
1770
1771 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1772
1773 // Add on L2TP header
1774 {
1775 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1776 if (!p) return;
1777 tunnelsend(b, len + (p-b), t); // send it...
1778 }
1779
1780 // Snooping this session, send it to intercept box
1781 if (sp->snoop_ip && sp->snoop_port)
1782 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1783
1784 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1785 sp->cout_delta += len;
1786 sp->pout++;
1787 udp_tx += len;
1788
1789 sess_local[s].cout += len; // To send to master..
1790 sess_local[s].pout++;
1791 }
1792
1793 //
1794 // Helper routine for the TBF filters.
1795 // Used to send queued data in to the user!
1796 //
1797 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1798 {
1799 sessiont *sp;
1800 tunnelidt t;
1801
1802 uint8_t b[MAXETHER + 20];
1803
1804 if (len < 0 || len > MAXETHER)
1805 {
1806 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1807 return;
1808 }
1809
1810 // Skip the tun header
1811 buf += 4;
1812 len -= 4;
1813
1814 if (!session[s].ip)
1815 return;
1816
1817 t = session[s].tunnel;
1818 sp = &session[s];
1819
1820 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1821
1822 // Add on L2TP header
1823 {
1824 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1825 if (!p) return;
1826 tunnelsend(b, len + (p-b), t); // send it...
1827 }
1828
1829 // Snooping this session.
1830 if (sp->snoop_ip && sp->snoop_port)
1831 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1832
1833 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1834 sp->cout_delta += len;
1835 sp->pout++;
1836 udp_tx += len;
1837
1838 sess_local[s].cout += len; // To send to master..
1839 sess_local[s].pout++;
1840 }
1841
1842 // add an AVP (16 bit)
1843 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1844 {
1845 uint16_t l = (m ? 0x8008 : 0x0008);
1846 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1847 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1848 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1849 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1850 c->length += 8;
1851 }
1852
1853 // add an AVP (32 bit)
1854 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1855 {
1856 uint16_t l = (m ? 0x800A : 0x000A);
1857 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1858 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1859 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1860 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1861 c->length += 10;
1862 }
1863
1864 // add an AVP (string)
1865 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1866 {
1867 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1868 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1869 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1870 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1871 memcpy(c->buf + c->length + 6, val, strlen(val));
1872 c->length += 6 + strlen(val);
1873 }
1874
1875 // add a binary AVP
1876 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1877 {
1878 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1879 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1880 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1881 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1882 memcpy(c->buf + c->length + 6, val, len);
1883 c->length += 6 + len;
1884 }
1885
1886 // new control connection
1887 static controlt *controlnew(uint16_t mtype)
1888 {
1889 controlt *c;
1890 if (!controlfree)
1891 c = malloc(sizeof(controlt));
1892 else
1893 {
1894 c = controlfree;
1895 controlfree = c->next;
1896 }
1897 assert(c);
1898 c->next = 0;
1899 c->buf[0] = 0xC8; // flags
1900 c->buf[1] = 0x02; // ver
1901 c->length = 12;
1902 control16(c, 0, mtype, 1);
1903 return c;
1904 }
1905
1906 // send zero block if nothing is waiting
1907 // (ZLB send).
1908 static void controlnull(tunnelidt t)
1909 {
1910 uint16_t buf[6];
1911 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1912 return;
1913
1914 buf[0] = htons(0xC802); // flags/ver
1915 buf[1] = htons(12); // length
1916 buf[2] = htons(tunnel[t].far); // tunnel
1917 buf[3] = htons(0); // session
1918 buf[4] = htons(tunnel[t].ns); // sequence
1919 buf[5] = htons(tunnel[t].nr); // sequence
1920 tunnelsend((uint8_t *)buf, 12, t);
1921 }
1922
1923 // add a control message to a tunnel, and send if within window
1924 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1925 {
1926 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1927 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1928 *(uint16_t *) (c->buf + 6) = htons(far); // session
1929 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1930 tunnel[t].ns++; // advance sequence
1931 // link in message in to queue
1932 if (tunnel[t].controlc)
1933 tunnel[t].controle->next = c;
1934 else
1935 tunnel[t].controls = c;
1936
1937 tunnel[t].controle = c;
1938 tunnel[t].controlc++;
1939
1940 // send now if space in window
1941 if (tunnel[t].controlc <= tunnel[t].window)
1942 {
1943 tunnel[t].try = 0; // first send
1944 tunnelsend(c->buf, c->length, t);
1945 }
1946 }
1947
1948 //
1949 // Throttle or Unthrottle a session
1950 //
1951 // Throttle the data from/to through a session to no more than
1952 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1953 // user).
1954 //
1955 // If either value is -1, the current value is retained for that
1956 // direction.
1957 //
1958 void throttle_session(sessionidt s, int rate_in, int rate_out)
1959 {
1960 if (!session[s].opened)
1961 return; // No-one home.
1962
1963 if (!*session[s].user)
1964 return; // User not logged in
1965
1966 if (rate_in >= 0)
1967 {
1968 int bytes = rate_in * 1024 / 8; // kbits to bytes
1969 if (session[s].tbf_in)
1970 free_tbf(session[s].tbf_in);
1971
1972 if (rate_in > 0)
1973 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1974 else
1975 session[s].tbf_in = 0;
1976
1977 session[s].throttle_in = rate_in;
1978 }
1979
1980 if (rate_out >= 0)
1981 {
1982 int bytes = rate_out * 1024 / 8;
1983 if (session[s].tbf_out)
1984 free_tbf(session[s].tbf_out);
1985
1986 if (rate_out > 0)
1987 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1988 else
1989 session[s].tbf_out = 0;
1990
1991 session[s].throttle_out = rate_out;
1992 }
1993 }
1994
1995 // add/remove filters from session (-1 = no change)
1996 void filter_session(sessionidt s, int filter_in, int filter_out)
1997 {
1998 if (!session[s].opened)
1999 return; // No-one home.
2000
2001 if (!*session[s].user)
2002 return; // User not logged in
2003
2004 // paranoia
2005 if (filter_in > MAXFILTER) filter_in = -1;
2006 if (filter_out > MAXFILTER) filter_out = -1;
2007 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2008 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2009
2010 if (filter_in >= 0)
2011 {
2012 if (session[s].filter_in)
2013 ip_filters[session[s].filter_in - 1].used--;
2014
2015 if (filter_in > 0)
2016 ip_filters[filter_in - 1].used++;
2017
2018 session[s].filter_in = filter_in;
2019 }
2020
2021 if (filter_out >= 0)
2022 {
2023 if (session[s].filter_out)
2024 ip_filters[session[s].filter_out - 1].used--;
2025
2026 if (filter_out > 0)
2027 ip_filters[filter_out - 1].used++;
2028
2029 session[s].filter_out = filter_out;
2030 }
2031 }
2032
2033 // start tidy shutdown of session
2034 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2035 {
2036 int walled_garden = session[s].walled_garden;
2037 bundleidt b = session[s].bundle;
2038 //delete routes only for last session in bundle (in case of MPPP)
2039 int del_routes = !b || (bundle[b].num_of_links == 1);
2040
2041 CSTAT(sessionshutdown);
2042
2043 if (!session[s].opened)
2044 {
2045 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2046 return; // not a live session
2047 }
2048
2049 if (!session[s].die)
2050 {
2051 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2052 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2053 run_plugins(PLUGIN_KILL_SESSION, &data);
2054 }
2055
2056 if (session[s].ip && !walled_garden && !session[s].die)
2057 {
2058 // RADIUS Stop message
2059 uint16_t r = radiusnew(s);
2060 if (r)
2061 {
2062 // stop, if not already trying
2063 if (radius[r].state != RADIUSSTOP)
2064 {
2065 radius[r].term_cause = term_cause;
2066 radius[r].term_msg = reason;
2067 radiussend(r, RADIUSSTOP);
2068 }
2069 }
2070 else
2071 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2072
2073 // Save counters to dump to accounting file
2074 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2075 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2076 }
2077
2078 if (!session[s].die)
2079 session[s].die = TIME + 150; // Clean up in 15 seconds
2080
2081 if (session[s].ip)
2082 { // IP allocated, clear and unroute
2083 int r;
2084 int routed = 0;
2085 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2086 {
2087 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2088 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2089 routed++;
2090
2091 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2092 session[s].route[r].ip = 0;
2093 }
2094
2095 if (session[s].ip_pool_index == -1) // static ip
2096 {
2097 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2098 session[s].ip = 0;
2099 }
2100 else
2101 free_ip_address(s);
2102
2103 // unroute IPv6, if setup
2104 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2105 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2106
2107 if (b)
2108 {
2109 // This session was part of a bundle
2110 bundle[b].num_of_links--;
2111 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2112 if(bundle[b].num_of_links == 0)
2113 {
2114 bundleclear(b);
2115 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2116 }
2117 else
2118 {
2119 // Adjust the members array to accomodate the new change
2120 uint8_t mem_num = 0;
2121 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2122 if(bundle[b].members[bundle[b].num_of_links] != s)
2123 {
2124 uint8_t ml;
2125 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2126 if(bundle[b].members[ml] == s)
2127 {
2128 mem_num = ml;
2129 break;
2130 }
2131 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2132 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2133
2134 // If the killed session is the first of the bundle,
2135 // the new first session must be stored in the cache_ipmap
2136 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2137 if (mem_num == 0)
2138 {
2139 sessionidt new_s = bundle[b].members[0];
2140
2141 routed = 0;
2142 // Add the route for this session.
2143 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2144 {
2145 int i, prefixlen;
2146 in_addr_t ip;
2147
2148 prefixlen = session[new_s].route[r].prefixlen;
2149 ip = session[new_s].route[r].ip;
2150
2151 if (!prefixlen) prefixlen = 32;
2152 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2153
2154 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2155 cache_ipmap(i, new_s);
2156 }
2157 cache_ipmap(session[new_s].ip, new_s);
2158
2159 // IPV6 route
2160 if (session[new_s].ipv6prefixlen)
2161 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2162 }
2163 }
2164 }
2165
2166 cluster_send_bundle(b);
2167 }
2168 }
2169
2170 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2171 throttle_session(s, 0, 0);
2172
2173 if (cdn_result)
2174 {
2175 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2176 {
2177 pppoe_shutdown_session(s);
2178 }
2179 else
2180 {
2181 // Send CDN
2182 controlt *c = controlnew(14); // sending CDN
2183 if (cdn_error)
2184 {
2185 uint16_t buf[2];
2186 buf[0] = htons(cdn_result);
2187 buf[1] = htons(cdn_error);
2188 controlb(c, 1, (uint8_t *)buf, 4, 1);
2189 }
2190 else
2191 control16(c, 1, cdn_result, 1);
2192
2193 control16(c, 14, s, 1); // assigned session (our end)
2194 controladd(c, session[s].far, session[s].tunnel); // send the message
2195 }
2196 }
2197
2198 // update filter refcounts
2199 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2200 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2201
2202 // clear PPP state
2203 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2204 sess_local[s].lcp.restart = 0;
2205 sess_local[s].ipcp.restart = 0;
2206 sess_local[s].ipv6cp.restart = 0;
2207 sess_local[s].ccp.restart = 0;
2208
2209 cluster_send_session(s);
2210 }
2211
2212 void sendipcp(sessionidt s, tunnelidt t)
2213 {
2214 uint8_t buf[MAXETHER];
2215 uint8_t *q;
2216
2217 CSTAT(sendipcp);
2218 LOG(3, s, t, "IPCP: send ConfigReq\n");
2219
2220 if (!session[s].unique_id)
2221 {
2222 if (!++last_id) ++last_id; // skip zero
2223 session[s].unique_id = last_id;
2224 }
2225
2226 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2227 if (!q) return;
2228
2229 *q = ConfigReq;
2230 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2231 *(uint16_t *) (q + 2) = htons(10); // packet length
2232 q[4] = 3; // ip address option
2233 q[5] = 6; // option length
2234 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2235 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2236 my_address; // send my IP
2237
2238 tunnelsend(buf, 10 + (q - buf), t); // send it
2239 restart_timer(s, ipcp);
2240 }
2241
2242 void sendipv6cp(sessionidt s, tunnelidt t)
2243 {
2244 uint8_t buf[MAXETHER];
2245 uint8_t *q;
2246
2247 CSTAT(sendipv6cp);
2248 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2249
2250 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2251 if (!q) return;
2252
2253 *q = ConfigReq;
2254 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2255 // only send one type
2256 // of request
2257 *(uint16_t *) (q + 2) = htons(14);
2258 q[4] = 1; // interface identifier option
2259 q[5] = 10; // option length
2260 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2261 *(uint32_t *) (q + 10) = 0;
2262 q[13] = 1;
2263
2264 tunnelsend(buf, 14 + (q - buf), t); // send it
2265 restart_timer(s, ipv6cp);
2266 }
2267
2268 static void sessionclear(sessionidt s)
2269 {
2270 memset(&session[s], 0, sizeof(session[s]));
2271 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2272 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2273
2274 session[s].tunnel = T_FREE; // Mark it as free.
2275 session[s].next = sessionfree;
2276 sessionfree = s;
2277 }
2278
2279 // kill a session now
2280 void sessionkill(sessionidt s, char *reason)
2281 {
2282 CSTAT(sessionkill);
2283
2284 if (!session[s].opened) // not alive
2285 return;
2286
2287 if (session[s].next)
2288 {
2289 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2290 return;
2291 }
2292
2293 if (!session[s].die)
2294 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2295
2296 if (sess_local[s].radius)
2297 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2298
2299 if (session[s].forwardtosession)
2300 {
2301 sessionidt sess = session[s].forwardtosession;
2302 if (session[sess].forwardtosession == s)
2303 {
2304 // Shutdown the linked session also.
2305 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2306 }
2307 }
2308
2309 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2310 sessionclear(s);
2311 cluster_send_session(s);
2312 }
2313
2314 static void tunnelclear(tunnelidt t)
2315 {
2316 if (!t) return;
2317 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2318 tunnel[t].state = TUNNELFREE;
2319 }
2320
2321 static void bundleclear(bundleidt b)
2322 {
2323 if (!b) return;
2324 memset(&bundle[b], 0, sizeof(bundle[b]));
2325 bundle[b].state = BUNDLEFREE;
2326 }
2327
2328 // kill a tunnel now
2329 static void tunnelkill(tunnelidt t, char *reason)
2330 {
2331 sessionidt s;
2332 controlt *c;
2333
2334 CSTAT(tunnelkill);
2335
2336 tunnel[t].state = TUNNELDIE;
2337
2338 // free control messages
2339 while ((c = tunnel[t].controls))
2340 {
2341 controlt * n = c->next;
2342 tunnel[t].controls = n;
2343 tunnel[t].controlc--;
2344 c->next = controlfree;
2345 controlfree = c;
2346 }
2347 // kill sessions
2348 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2349 if (session[s].tunnel == t)
2350 sessionkill(s, reason);
2351
2352 // free tunnel
2353 tunnelclear(t);
2354 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2355 cli_tunnel_actions[t].action = 0;
2356 cluster_send_tunnel(t);
2357 }
2358
2359 // shut down a tunnel cleanly
2360 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2361 {
2362 sessionidt s;
2363
2364 CSTAT(tunnelshutdown);
2365
2366 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2367 {
2368 // never set up, can immediately kill
2369 tunnelkill(t, reason);
2370 return;
2371 }
2372 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2373
2374 // close session
2375 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2376 if (session[s].tunnel == t)
2377 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2378
2379 tunnel[t].state = TUNNELDIE;
2380 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2381 cluster_send_tunnel(t);
2382 // TBA - should we wait for sessions to stop?
2383 if (result)
2384 {
2385 controlt *c = controlnew(4); // sending StopCCN
2386 if (error)
2387 {
2388 uint16_t buf[32];
2389 int l = 4;
2390 buf[0] = htons(result);
2391 buf[1] = htons(error);
2392 if (msg)
2393 {
2394 int m = strlen(msg);
2395 if (m + 4 > sizeof(buf))
2396 m = sizeof(buf) - 4;
2397
2398 memcpy(buf+2, msg, m);
2399 l += m;
2400 }
2401
2402 controlb(c, 1, (uint8_t *)buf, l, 1);
2403 }
2404 else
2405 control16(c, 1, result, 1);
2406
2407 control16(c, 9, t, 1); // assigned tunnel (our end)
2408 controladd(c, 0, t); // send the message
2409 }
2410 }
2411
2412 // read and process packet on tunnel (UDP)
2413 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2414 {
2415 uint8_t *sendchalresponse = NULL;
2416 uint8_t *recvchalresponse = NULL;
2417 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2418 uint8_t *p = buf + 2;
2419
2420
2421 CSTAT(processudp);
2422
2423 udp_rx += len;
2424 udp_rx_pkt++;
2425 LOG_HEX(5, "UDP Data", buf, len);
2426 STAT(tunnel_rx_packets);
2427 INC_STAT(tunnel_rx_bytes, len);
2428 if (len < 6)
2429 {
2430 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2431 STAT(tunnel_rx_errors);
2432 return;
2433 }
2434 if ((buf[1] & 0x0F) != 2)
2435 {
2436 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2437 STAT(tunnel_rx_errors);
2438 return;
2439 }
2440 if (*buf & 0x40)
2441 { // length
2442 l = ntohs(*(uint16_t *) p);
2443 p += 2;
2444 }
2445 t = ntohs(*(uint16_t *) p);
2446 p += 2;
2447 s = ntohs(*(uint16_t *) p);
2448 p += 2;
2449 if (s >= MAXSESSION)
2450 {
2451 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2452 STAT(tunnel_rx_errors);
2453 return;
2454 }
2455 if (t >= MAXTUNNEL)
2456 {
2457 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2458 STAT(tunnel_rx_errors);
2459 return;
2460 }
2461 if (t == TUNNEL_ID_PPPOE)
2462 {
2463 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2464 STAT(tunnel_rx_errors);
2465 return;
2466 }
2467 if (*buf & 0x08)
2468 { // ns/nr
2469 ns = ntohs(*(uint16_t *) p);
2470 p += 2;
2471 nr = ntohs(*(uint16_t *) p);
2472 p += 2;
2473 }
2474 if (*buf & 0x02)
2475 { // offset
2476 uint16_t o = ntohs(*(uint16_t *) p);
2477 p += o + 2;
2478 }
2479 if ((p - buf) > l)
2480 {
2481 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2482 STAT(tunnel_rx_errors);
2483 return;
2484 }
2485 l -= (p - buf);
2486
2487 // used to time out old tunnels
2488 if (t && tunnel[t].state == TUNNELOPEN)
2489 tunnel[t].lastrec = time_now;
2490
2491 if (*buf & 0x80)
2492 { // control
2493 uint16_t message = 0xFFFF; // message type
2494 uint8_t fatal = 0;
2495 uint8_t mandatory = 0;
2496 uint16_t asession = 0; // assigned session
2497 uint32_t amagic = 0; // magic number
2498 uint8_t aflags = 0; // flags from last LCF
2499 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2500 char called[MAXTEL] = ""; // called number
2501 char calling[MAXTEL] = ""; // calling number
2502
2503 if (!config->cluster_iam_master)
2504 {
2505 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2506 return;
2507 }
2508
2509 // control messages must have bits 0x80|0x40|0x08
2510 // (type, length and sequence) set, and bits 0x02|0x01
2511 // (offset and priority) clear
2512 if ((*buf & 0xCB) != 0xC8)
2513 {
2514 LOG(1, s, t, "Bad control header %02X\n", *buf);
2515 STAT(tunnel_rx_errors);
2516 return;
2517 }
2518
2519 // check for duplicate tunnel open message
2520 if (!t && ns == 0)
2521 {
2522 int i;
2523
2524 //
2525 // Is this a duplicate of the first packet? (SCCRQ)
2526 //
2527 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2528 {
2529 if (tunnel[i].state != TUNNELOPENING ||
2530 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2531 tunnel[i].port != ntohs(addr->sin_port) )
2532 continue;
2533 t = i;
2534 LOG(3, s, t, "Duplicate SCCRQ?\n");
2535 break;
2536 }
2537 }
2538
2539 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2540 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2541
2542 // if no tunnel specified, assign one
2543 if (!t)
2544 {
2545 if (!(t = new_tunnel()))
2546 {
2547 LOG(1, 0, 0, "No more tunnels\n");
2548 STAT(tunnel_overflow);
2549 return;
2550 }
2551 tunnelclear(t);
2552 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2553 tunnel[t].port = ntohs(addr->sin_port);
2554 tunnel[t].window = 4; // default window
2555 tunnel[t].indexudp = indexudpfd;
2556 STAT(tunnel_created);
2557 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2558 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2559 }
2560
2561 // If the 'ns' just received is not the 'nr' we're
2562 // expecting, just send an ack and drop it.
2563 //
2564 // if 'ns' is less, then we got a retransmitted packet.
2565 // if 'ns' is greater than missed a packet. Either way
2566 // we should ignore it.
2567 if (ns != tunnel[t].nr)
2568 {
2569 // is this the sequence we were expecting?
2570 STAT(tunnel_rx_errors);
2571 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2572 t, ns, tunnel[t].nr);
2573
2574 if (l) // Is this not a ZLB?
2575 controlnull(t);
2576 return;
2577 }
2578
2579 // check sequence of this message
2580 {
2581 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2582 // some to clear maybe?
2583 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2584 {
2585 controlt *c = tunnel[t].controls;
2586 tunnel[t].controls = c->next;
2587 tunnel[t].controlc--;
2588 c->next = controlfree;
2589 controlfree = c;
2590 skip--;
2591 tunnel[t].try = 0; // we have progress
2592 }
2593
2594 // receiver advance (do here so quoted correctly in any sends below)
2595 if (l) tunnel[t].nr = (ns + 1);
2596 if (skip < 0) skip = 0;
2597 if (skip < tunnel[t].controlc)
2598 {
2599 // some control packets can now be sent that were previous stuck out of window
2600 int tosend = tunnel[t].window - skip;
2601 controlt *c = tunnel[t].controls;
2602 while (c && skip)
2603 {
2604 c = c->next;
2605 skip--;
2606 }
2607 while (c && tosend)
2608 {
2609 tunnel[t].try = 0; // first send
2610 tunnelsend(c->buf, c->length, t);
2611 c = c->next;
2612 tosend--;
2613 }
2614 }
2615 if (!tunnel[t].controlc)
2616 tunnel[t].retry = 0; // caught up
2617 }
2618 if (l)
2619 { // if not a null message
2620 int result = 0;
2621 int error = 0;
2622 char *msg = 0;
2623
2624 // Default disconnect cause/message on receipt of CDN. Set to
2625 // more specific value from attribute 1 (result code) or 46
2626 // (disconnect cause) if present below.
2627 int disc_cause_set = 0;
2628 int disc_cause = TERM_NAS_REQUEST;
2629 char const *disc_reason = "Closed (Received CDN).";
2630
2631 // process AVPs
2632 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2633 {
2634 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2635 uint8_t *b = p;
2636 uint8_t flags = *p;
2637 uint16_t mtype;
2638
2639 if (n > l)
2640 {
2641 LOG(1, s, t, "Invalid length in AVP\n");
2642 STAT(tunnel_rx_errors);
2643 return;
2644 }
2645 p += n; // next
2646 l -= n;
2647 if (flags & 0x3C) // reserved bits, should be clear
2648 {
2649 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2650 fatal = flags;
2651 result = 2; // general error
2652 error = 3; // reserved field non-zero
2653 msg = 0;
2654 continue; // next
2655 }
2656 b += 2;
2657 if (*(uint16_t *) (b))
2658 {
2659 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2660 fatal = flags;
2661 result = 2; // general error
2662 error = 6; // generic vendor-specific error
2663 msg = "unsupported vendor-specific";
2664 continue; // next
2665 }
2666 b += 2;
2667 mtype = ntohs(*(uint16_t *) (b));
2668 b += 2;
2669 n -= 6;
2670
2671 if (flags & 0x40)
2672 {
2673 uint16_t orig_len;
2674
2675 // handle hidden AVPs
2676 if (!*config->l2tp_secret)
2677 {
2678 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2679 fatal = flags;
2680 result = 2; // general error
2681 error = 6; // generic vendor-specific error
2682 msg = "secret not specified";
2683 continue;
2684 }
2685 if (!session[s].random_vector_length)
2686 {
2687 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2688 fatal = flags;
2689 result = 2; // general error
2690 error = 6; // generic
2691 msg = "no random vector";
2692 continue;
2693 }
2694 if (n < 8)
2695 {
2696 LOG(2, s, t, "Short hidden AVP.\n");
2697 fatal = flags;
2698 result = 2; // general error
2699 error = 2; // length is wrong
2700 msg = 0;
2701 continue;
2702 }
2703
2704 // Unhide the AVP
2705 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2706
2707 orig_len = ntohs(*(uint16_t *) b);
2708 if (orig_len > n + 2)
2709 {
2710 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2711 orig_len, n);
2712
2713 fatal = flags;
2714 result = 2; // general error
2715 error = 2; // length is wrong
2716 msg = 0;
2717 continue;
2718 }
2719
2720 b += 2;
2721 n = orig_len;
2722 }
2723
2724 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2725 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2726
2727 switch (mtype)
2728 {
2729 case 0: // message type
2730 message = ntohs(*(uint16_t *) b);
2731 mandatory = flags & 0x80;
2732 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2733 break;
2734 case 1: // result code
2735 {
2736 uint16_t rescode = ntohs(*(uint16_t *) b);
2737 char const *resdesc = "(unknown)";
2738 char const *errdesc = NULL;
2739 int cause = 0;
2740
2741 if (message == 4)
2742 { /* StopCCN */
2743 resdesc = l2tp_stopccn_result_code(rescode);
2744 cause = TERM_LOST_SERVICE;
2745 }
2746 else if (message == 14)
2747 { /* CDN */
2748 resdesc = l2tp_cdn_result_code(rescode);
2749 if (rescode == 1)
2750 cause = TERM_LOST_CARRIER;
2751 else
2752 cause = TERM_ADMIN_RESET;
2753 }
2754
2755 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2756 if (n >= 4)
2757 {
2758 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2759 errdesc = l2tp_error_code(errcode);
2760 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2761 }
2762 if (n > 4)
2763 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2764
2765 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2766 {
2767 disc_cause_set = mtype;
2768 disc_reason = errdesc ? errdesc : resdesc;
2769 disc_cause = cause;
2770 }
2771
2772 break;
2773 }
2774 break;
2775 case 2: // protocol version
2776 {
2777 version = ntohs(*(uint16_t *) (b));
2778 LOG(4, s, t, " Protocol version = %u\n", version);
2779 if (version && version != 0x0100)
2780 { // allow 0.0 and 1.0
2781 LOG(1, s, t, " Bad protocol version %04X\n", version);
2782 fatal = flags;
2783 result = 5; // unspported protocol version
2784 error = 0x0100; // supported version
2785 msg = 0;
2786 continue; // next
2787 }
2788 }
2789 break;
2790 case 3: // framing capabilities
2791 break;
2792 case 4: // bearer capabilities
2793 break;
2794 case 5: // tie breaker
2795 // We never open tunnels, so we don't care about tie breakers
2796 continue;
2797 case 6: // firmware revision
2798 break;
2799 case 7: // host name
2800 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2801 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2802 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2803 // TBA - to send to RADIUS
2804 break;
2805 case 8: // vendor name
2806 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2807 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2808 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2809 break;
2810 case 9: // assigned tunnel
2811 tunnel[t].far = ntohs(*(uint16_t *) (b));
2812 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2813 break;
2814 case 10: // rx window
2815 tunnel[t].window = ntohs(*(uint16_t *) (b));
2816 if (!tunnel[t].window)
2817 tunnel[t].window = 1; // window of 0 is silly
2818 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2819 break;
2820 case 11: // Request Challenge
2821 {
2822 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2823 if (message == 1)
2824 build_chap_response(b, 2, n, &sendchalresponse);
2825 else if (message == 2)
2826 build_chap_response(b, 3, n, &sendchalresponse);
2827 }
2828 break;
2829 case 13: // receive challenge Response
2830 if (tunnel[t].isremotelns)
2831 {
2832 recvchalresponse = calloc(17, 1);
2833 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2834 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2835 }
2836 else
2837 // Why did they send a response? We never challenge.
2838 LOG(2, s, t, " received unexpected challenge response\n");
2839 break;
2840
2841 case 14: // assigned session
2842 asession = session[s].far = ntohs(*(uint16_t *) (b));
2843 LOG(4, s, t, " assigned session = %u\n", asession);
2844 break;
2845 case 15: // call serial number
2846 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2847 break;
2848 case 18: // bearer type
2849 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2850 // TBA - for RADIUS
2851 break;
2852 case 19: // framing type
2853 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2854 // TBA
2855 break;
2856 case 21: // called number
2857 memset(called, 0, sizeof(called));
2858 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2859 LOG(4, s, t, " Called <%s>\n", called);
2860 break;
2861 case 22: // calling number
2862 memset(calling, 0, sizeof(calling));
2863 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2864 LOG(4, s, t, " Calling <%s>\n", calling);
2865 break;
2866 case 23: // subtype
2867 break;
2868 case 24: // tx connect speed
2869 if (n == 4)
2870 {
2871 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2872 }
2873 else
2874 {
2875 // AS5300s send connect speed as a string
2876 char tmp[30];
2877 memset(tmp, 0, sizeof(tmp));
2878 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2879 session[s].tx_connect_speed = atol(tmp);
2880 }
2881 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2882 break;
2883 case 38: // rx connect speed
2884 if (n == 4)
2885 {
2886 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2887 }
2888 else
2889 {
2890 // AS5300s send connect speed as a string
2891 char tmp[30];
2892 memset(tmp, 0, sizeof(tmp));
2893 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2894 session[s].rx_connect_speed = atol(tmp);
2895 }
2896 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2897 break;
2898 case 25: // Physical Channel ID
2899 {
2900 uint32_t tmp = ntohl(*(uint32_t *) b);
2901 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2902 break;
2903 }
2904 case 29: // Proxy Authentication Type
2905 {
2906 uint16_t atype = ntohs(*(uint16_t *)b);
2907 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2908 break;
2909 }
2910 case 30: // Proxy Authentication Name
2911 {
2912 char authname[64];
2913 memset(authname, 0, sizeof(authname));
2914 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2915 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2916 authname);
2917 break;
2918 }
2919 case 31: // Proxy Authentication Challenge
2920 {
2921 LOG(4, s, t, " Proxy Auth Challenge\n");
2922 break;
2923 }
2924 case 32: // Proxy Authentication ID
2925 {
2926 uint16_t authid = ntohs(*(uint16_t *)(b));
2927 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2928 break;
2929 }
2930 case 33: // Proxy Authentication Response
2931 LOG(4, s, t, " Proxy Auth Response\n");
2932 break;
2933 case 27: // last sent lcp
2934 { // find magic number
2935 uint8_t *p = b, *e = p + n;
2936 while (p + 1 < e && p[1] && p + p[1] <= e)
2937 {
2938 if (*p == 5 && p[1] == 6) // Magic-Number
2939 amagic = ntohl(*(uint32_t *) (p + 2));
2940 else if (*p == 7) // Protocol-Field-Compression
2941 aflags |= SESSION_PFC;
2942 else if (*p == 8) // Address-and-Control-Field-Compression
2943 aflags |= SESSION_ACFC;
2944 p += p[1];
2945 }
2946 }
2947 break;
2948 case 28: // last recv lcp confreq
2949 break;
2950 case 26: // Initial Received LCP CONFREQ
2951 break;
2952 case 39: // seq required - we control it as an LNS anyway...
2953 break;
2954 case 36: // Random Vector
2955 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2956 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2957 if (n > sizeof(session[s].random_vector))
2958 n = sizeof(session[s].random_vector);
2959 memcpy(session[s].random_vector, b, n);
2960 session[s].random_vector_length = n;
2961 break;
2962 case 46: // ppp disconnect cause
2963 if (n >= 5)
2964 {
2965 uint16_t code = ntohs(*(uint16_t *) b);
2966 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2967 uint8_t dir = *(b + 4);
2968
2969 LOG(4, s, t, " PPP disconnect cause "
2970 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2971 code, proto, dir, n - 5, b + 5);
2972
2973 disc_cause_set = mtype;
2974
2975 switch (code)
2976 {
2977 case 1: // admin disconnect
2978 disc_cause = TERM_ADMIN_RESET;
2979 disc_reason = "Administrative disconnect";
2980 break;
2981 case 3: // lcp terminate
2982 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2983 disc_cause = TERM_USER_REQUEST;
2984 disc_reason = "Normal disconnection";
2985 break;
2986 case 4: // compulsory encryption unavailable
2987 if (dir != 1) break; // 1=refused by peer, 2=local
2988 disc_cause = TERM_USER_ERROR;
2989 disc_reason = "Compulsory encryption refused";
2990 break;
2991 case 5: // lcp: fsm timeout
2992 disc_cause = TERM_PORT_ERROR;
2993 disc_reason = "LCP: FSM timeout";
2994 break;
2995 case 6: // lcp: no recognisable lcp packets received
2996 disc_cause = TERM_PORT_ERROR;
2997 disc_reason = "LCP: no recognisable LCP packets";
2998 break;
2999 case 7: // lcp: magic-no error (possibly looped back)
3000 disc_cause = TERM_PORT_ERROR;
3001 disc_reason = "LCP: magic-no error (possible loop)";
3002 break;
3003 case 8: // lcp: echo request timeout
3004 disc_cause = TERM_PORT_ERROR;
3005 disc_reason = "LCP: echo request timeout";
3006 break;
3007 case 13: // auth: fsm timeout
3008 disc_cause = TERM_SERVICE_UNAVAILABLE;
3009 disc_reason = "Authentication: FSM timeout";
3010 break;
3011 case 15: // auth: unacceptable auth protocol
3012 disc_cause = TERM_SERVICE_UNAVAILABLE;
3013 disc_reason = "Unacceptable authentication protocol";
3014 break;
3015 case 16: // auth: authentication failed
3016 disc_cause = TERM_SERVICE_UNAVAILABLE;
3017 disc_reason = "Authentication failed";
3018 break;
3019 case 17: // ncp: fsm timeout
3020 disc_cause = TERM_SERVICE_UNAVAILABLE;
3021 disc_reason = "NCP: FSM timeout";
3022 break;
3023 case 18: // ncp: no ncps available
3024 disc_cause = TERM_SERVICE_UNAVAILABLE;
3025 disc_reason = "NCP: no NCPs available";
3026 break;
3027 case 19: // ncp: failure to converge on acceptable address
3028 disc_cause = TERM_SERVICE_UNAVAILABLE;
3029 disc_reason = (dir == 1)
3030 ? "NCP: too many Configure-Naks received from peer"
3031 : "NCP: too many Configure-Naks sent to peer";
3032 break;
3033 case 20: // ncp: user not permitted to use any address
3034 disc_cause = TERM_SERVICE_UNAVAILABLE;
3035 disc_reason = (dir == 1)
3036 ? "NCP: local link address not acceptable to peer"
3037 : "NCP: remote link address not acceptable";
3038 break;
3039 }
3040 }
3041 break;
3042 default:
3043 {
3044 static char e[] = "unknown AVP 0xXXXX";
3045 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3046 fatal = flags;
3047 result = 2; // general error
3048 error = 8; // unknown mandatory AVP
3049 sprintf((msg = e) + 14, "%04x", mtype);
3050 continue; // next
3051 }
3052 }
3053 }
3054 // process message
3055 if (fatal & 0x80)
3056 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3057 else
3058 switch (message)
3059 {
3060 case 1: // SCCRQ - Start Control Connection Request
3061 tunnel[t].state = TUNNELOPENING;
3062 LOG(3, s, t, "Received SCCRQ\n");
3063 if (main_quit != QUIT_SHUTDOWN)
3064 {
3065 LOG(3, s, t, "sending SCCRP\n");
3066 controlt *c = controlnew(2); // sending SCCRP
3067 control16(c, 2, version, 1); // protocol version
3068 control32(c, 3, 3, 1); // framing
3069 controls(c, 7, hostname, 1); // host name
3070 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3071 control16(c, 9, t, 1); // assigned tunnel
3072 controladd(c, 0, t); // send the resply
3073 }
3074 else
3075 {
3076 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3077 }
3078 break;
3079 case 2: // SCCRP
3080 tunnel[t].state = TUNNELOPEN;
3081 tunnel[t].lastrec = time_now;
3082 LOG(3, s, t, "Received SCCRP\n");
3083 if (main_quit != QUIT_SHUTDOWN)
3084 {
3085 if (tunnel[t].isremotelns && recvchalresponse)
3086 {
3087 hasht hash;
3088
3089 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3090 // check authenticator
3091 if (memcmp(hash, recvchalresponse, 16) == 0)
3092 {
3093 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3094 controlt *c = controlnew(3); // sending SCCCN
3095 controls(c, 7, hostname, 1); // host name
3096 controls(c, 8, Vendor_name, 1); // Vendor name
3097 control16(c, 2, version, 1); // protocol version
3098 control32(c, 3, 3, 1); // framing Capabilities
3099 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3100 control16(c, 9, t, 1); // assigned tunnel
3101 controladd(c, 0, t); // send
3102 }
3103 else
3104 {
3105 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3106 }
3107 }
3108 }
3109 else
3110 {
3111 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3112 }
3113 break;
3114 case 3: // SCCN
3115 LOG(3, s, t, "Received SCCN\n");
3116 tunnel[t].state = TUNNELOPEN;
3117 tunnel[t].lastrec = time_now;
3118 controlnull(t); // ack
3119 break;
3120 case 4: // StopCCN
3121 LOG(3, s, t, "Received StopCCN\n");
3122 controlnull(t); // ack
3123 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3124 break;
3125 case 6: // HELLO
3126 LOG(3, s, t, "Received HELLO\n");
3127 controlnull(t); // simply ACK
3128 break;
3129 case 7: // OCRQ
3130 // TBA
3131 LOG(3, s, t, "Received OCRQ\n");
3132 break;
3133 case 8: // OCRO
3134 // TBA
3135 LOG(3, s, t, "Received OCRO\n");
3136 break;
3137 case 9: // OCCN
3138 // TBA
3139 LOG(3, s, t, "Received OCCN\n");
3140 break;
3141 case 10: // ICRQ
3142 LOG(3, s, t, "Received ICRQ\n");
3143 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3144 {
3145 controlt *c = controlnew(11); // ICRP
3146
3147 LOG(3, s, t, "Sending ICRP\n");
3148
3149 s = sessionfree;
3150 sessionfree = session[s].next;
3151 memset(&session[s], 0, sizeof(session[s]));
3152
3153 if (s > config->cluster_highest_sessionid)
3154 config->cluster_highest_sessionid = s;
3155
3156 session[s].opened = time_now;
3157 session[s].tunnel = t;
3158 session[s].far = asession;
3159 session[s].last_packet = session[s].last_data = time_now;
3160 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3161 control16(c, 14, s, 1); // assigned session
3162 controladd(c, asession, t); // send the reply
3163
3164 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3165 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3166
3167 session[s].ppp.phase = Establish;
3168 session[s].ppp.lcp = Starting;
3169
3170 STAT(session_created);
3171 break;
3172 }
3173
3174 {
3175 controlt *c = controlnew(14); // CDN
3176 LOG(3, s, t, "Sending CDN\n");
3177 if (!sessionfree)
3178 {
3179 STAT(session_overflow);
3180 LOG(1, 0, t, "No free sessions\n");
3181 control16(c, 1, 4, 0); // temporary lack of resources
3182 }
3183 else
3184 control16(c, 1, 2, 7); // shutting down, try another
3185
3186 controladd(c, asession, t); // send the message
3187 }
3188 return;
3189 case 11: // ICRP
3190 LOG(3, s, t, "Received ICRP\n");
3191 if (session[s].forwardtosession)
3192 {
3193 controlt *c = controlnew(12); // ICCN
3194
3195 session[s].opened = time_now;
3196 session[s].tunnel = t;
3197 session[s].far = asession;
3198 session[s].last_packet = session[s].last_data = time_now;
3199
3200 control32(c, 19, 1, 1); // Framing Type
3201 control32(c, 24, 10000000, 1); // Tx Connect Speed
3202 controladd(c, asession, t); // send the message
3203 LOG(3, s, t, "Sending ICCN\n");
3204 }
3205 break;
3206 case 12: // ICCN
3207 LOG(3, s, t, "Received ICCN\n");
3208 if (amagic == 0) amagic = time_now;
3209 session[s].magic = amagic; // set magic number
3210 session[s].flags = aflags; // set flags received
3211 session[s].mru = PPPoE_MRU; // default
3212 controlnull(t); // ack
3213
3214 // start LCP
3215 sess_local[s].lcp_authtype = config->radius_authprefer;
3216 sess_local[s].ppp_mru = MRU;
3217
3218 // Set multilink options before sending initial LCP packet
3219 sess_local[s].mp_mrru = 1614;
3220 sess_local[s].mp_epdis = ntohl(config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] : my_address);
3221
3222 sendlcp(s, t);
3223 change_state(s, lcp, RequestSent);
3224 break;
3225
3226 case 14: // CDN
3227 LOG(3, s, t, "Received CDN\n");
3228 controlnull(t); // ack
3229 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3230 break;
3231 case 0xFFFF:
3232 LOG(1, s, t, "Missing message type\n");
3233 break;
3234 default:
3235 STAT(tunnel_rx_errors);
3236 if (mandatory)
3237 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3238 else
3239 LOG(1, s, t, "Unknown message type %u\n", message);
3240 break;
3241 }
3242 if (sendchalresponse) free(sendchalresponse);
3243 if (recvchalresponse) free(recvchalresponse);
3244 cluster_send_tunnel(t);
3245 }
3246 else
3247 {
3248 LOG(4, s, t, " Got a ZLB ack\n");
3249 }
3250 }
3251 else
3252 { // data
3253 uint16_t proto;
3254
3255 LOG_HEX(5, "Receive Tunnel Data", p, l);
3256 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3257 { // HDLC address header, discard
3258 p += 2;
3259 l -= 2;
3260 }
3261 if (l < 2)
3262 {
3263 LOG(1, s, t, "Short ppp length %d\n", l);
3264 STAT(tunnel_rx_errors);
3265 return;
3266 }
3267 if (*p & 1)
3268 {
3269 proto = *p++;
3270 l--;
3271 }
3272 else
3273 {
3274 proto = ntohs(*(uint16_t *) p);
3275 p += 2;
3276 l -= 2;
3277 }
3278
3279 if (session[s].forwardtosession)
3280 {
3281 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3282 // Forward to LAC/BAS or Remote LNS session
3283 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3284 return;
3285 }
3286 else if (config->auth_tunnel_change_addr_src)
3287 {
3288 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3289 tunnel[t].port == ntohs(addr->sin_port))
3290 {
3291 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3292 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3293 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3294
3295 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3296 }
3297 }
3298
3299 if (s && !session[s].opened) // Is something wrong??
3300 {
3301 if (!config->cluster_iam_master)
3302 {
3303 // Pass it off to the master to deal with..
3304 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3305 return;
3306 }
3307
3308 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3309 STAT(tunnel_rx_errors);
3310 return;
3311 }
3312
3313 if (proto == PPPPAP)
3314 {
3315 session[s].last_packet = time_now;
3316 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3317 processpap(s, t, p, l);
3318 }
3319 else if (proto == PPPCHAP)
3320 {
3321 session[s].last_packet = time_now;
3322 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3323 processchap(s, t, p, l);
3324 }
3325 else if (proto == PPPLCP)
3326 {
3327 session[s].last_packet = time_now;
3328 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3329 processlcp(s, t, p, l);
3330 }
3331 else if (proto == PPPIPCP)
3332 {
3333 session[s].last_packet = time_now;
3334 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3335 processipcp(s, t, p, l);
3336 }
3337 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3338 {
3339 session[s].last_packet = time_now;
3340 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3341 processipv6cp(s, t, p, l);
3342 }
3343 else if (proto == PPPCCP)
3344 {
3345 session[s].last_packet = time_now;
3346 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3347 processccp(s, t, p, l);
3348 }
3349 else if (proto == PPPIP)
3350 {
3351 if (session[s].die)
3352 {
3353 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3354 return; // closing session, PPP not processed
3355 }
3356
3357 session[s].last_packet = session[s].last_data = time_now;
3358 if (session[s].walled_garden && !config->cluster_iam_master)
3359 {
3360 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3361 return;
3362 }
3363
3364 processipin(s, t, p, l);
3365 }
3366 else if (proto == PPPMP)
3367 {
3368 if (session[s].die)
3369 {
3370 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3371 return; // closing session, PPP not processed
3372 }
3373
3374 session[s].last_packet = session[s].last_data = time_now;
3375 if (!config->cluster_iam_master)
3376 {
3377 // The fragments reconstruction is managed by the Master.
3378 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3379 return;
3380 }
3381
3382 processmpin(s, t, p, l);
3383 }
3384 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3385 {
3386 if (session[s].die)
3387 {
3388 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3389 return; // closing session, PPP not processed
3390 }
3391
3392 session[s].last_packet = session[s].last_data = time_now;
3393 if (session[s].walled_garden && !config->cluster_iam_master)
3394 {
3395 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3396 return;
3397 }
3398
3399 processipv6in(s, t, p, l);
3400 }
3401 else if (session[s].ppp.lcp == Opened)
3402 {
3403 session[s].last_packet = time_now;
3404 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3405 protoreject(s, t, p, l, proto);
3406 }
3407 else
3408 {
3409 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3410 proto, ppp_state(session[s].ppp.lcp));
3411 }
3412 }
3413 }
3414
3415 // read and process packet on tun
3416 // (i.e. this routine writes to buf[-8]).
3417 static void processtun(uint8_t * buf, int len)
3418 {
3419 LOG_HEX(5, "Receive TUN Data", buf, len);
3420 STAT(tun_rx_packets);
3421 INC_STAT(tun_rx_bytes, len);
3422
3423 CSTAT(processtun);
3424
3425 eth_rx_pkt++;
3426 eth_rx += len;
3427 if (len < 22)
3428 {
3429 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3430 STAT(tun_rx_errors);
3431 return;
3432 }
3433
3434 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3435 processipout(buf, len);
3436 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3437 && config->ipv6_prefix.s6_addr[0])
3438 processipv6out(buf, len);
3439
3440 // Else discard.
3441 }
3442
3443 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3444 // that we look at the whole of the tunnel, radius and session tables
3445 // every second
3446 static void regular_cleanups(double period)
3447 {
3448 // Next tunnel, radius and session to check for actions on.
3449 static tunnelidt t = 0;
3450 static int r = 0;
3451 static sessionidt s = 0;
3452
3453 int t_actions = 0;
3454 int r_actions = 0;
3455 int s_actions = 0;
3456
3457 int t_slice;
3458 int r_slice;
3459 int s_slice;
3460
3461 int i;
3462 int a;
3463
3464 // divide up tables into slices based on the last run
3465 t_slice = config->cluster_highest_tunnelid * period;
3466 r_slice = (MAXRADIUS - 1) * period;
3467 s_slice = config->cluster_highest_sessionid * period;
3468
3469 if (t_slice < 1)
3470 t_slice = 1;
3471 else if (t_slice > config->cluster_highest_tunnelid)
3472 t_slice = config->cluster_highest_tunnelid;
3473
3474 if (r_slice < 1)
3475 r_slice = 1;
3476 else if (r_slice > (MAXRADIUS - 1))
3477 r_slice = MAXRADIUS - 1;
3478
3479 if (s_slice < 1)
3480 s_slice = 1;
3481 else if (s_slice > config->cluster_highest_sessionid)
3482 s_slice = config->cluster_highest_sessionid;
3483
3484 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3485
3486 for (i = 0; i < t_slice; i++)
3487 {
3488 t++;
3489 if (t > config->cluster_highest_tunnelid)
3490 t = 1;
3491
3492 if (t == TUNNEL_ID_PPPOE)
3493 continue;
3494
3495 // check for expired tunnels
3496 if (tunnel[t].die && tunnel[t].die <= TIME)
3497 {
3498 STAT(tunnel_timeout);
3499 tunnelkill(t, "Expired");
3500 t_actions++;
3501 continue;
3502 }
3503 // check for message resend
3504 if (tunnel[t].retry && tunnel[t].controlc)
3505 {
3506 // resend pending messages as timeout on reply
3507 if (tunnel[t].retry <= TIME)
3508 {
3509 controlt *c = tunnel[t].controls;
3510 uint16_t w = tunnel[t].window;
3511 tunnel[t].try++; // another try
3512 if (tunnel[t].try > 5)
3513 tunnelkill(t, "Timeout on control message"); // game over
3514 else
3515 while (c && w--)
3516 {
3517 tunnelsend(c->buf, c->length, t);
3518 c = c->next;
3519 }
3520
3521 t_actions++;
3522 }
3523 }
3524 // Send hello
3525 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3526 {
3527 if (!config->disable_sending_hello)
3528 {
3529 controlt *c = controlnew(6); // sending HELLO
3530 controladd(c, 0, t); // send the message
3531 LOG(3, 0, t, "Sending HELLO message\n");
3532 t_actions++;
3533 }
3534 }
3535
3536 // Check for tunnel changes requested from the CLI
3537 if ((a = cli_tunnel_actions[t].action))
3538 {
3539 cli_tunnel_actions[t].action = 0;
3540 if (a & CLI_TUN_KILL)
3541 {
3542 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3543 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3544 t_actions++;
3545 }
3546 }
3547 }
3548
3549 for (i = 0; i < r_slice; i++)
3550 {
3551 r++;
3552 if (r >= MAXRADIUS)
3553 r = 1;
3554
3555 if (!radius[r].state)
3556 continue;
3557
3558 if (radius[r].retry <= TIME)
3559 {
3560 radiusretry(r);
3561 r_actions++;
3562 }
3563 }
3564
3565 for (i = 0; i < s_slice; i++)
3566 {
3567 s++;
3568 if (s > config->cluster_highest_sessionid)
3569 s = 1;
3570
3571 if (!session[s].opened) // Session isn't in use
3572 continue;
3573
3574 // check for expired sessions
3575 if (session[s].die)
3576 {
3577 if (session[s].die <= TIME)
3578 {
3579 sessionkill(s, "Expired");
3580 s_actions++;
3581 }
3582 continue;
3583 }
3584
3585 // PPP timeouts
3586 if (sess_local[s].lcp.restart <= time_now)
3587 {
3588 int next_state = session[s].ppp.lcp;
3589 switch (session[s].ppp.lcp)
3590 {
3591 case RequestSent:
3592 case AckReceived:
3593 next_state = RequestSent;
3594
3595 case AckSent:
3596 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3597 {
3598 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3599 sendlcp(s, session[s].tunnel);
3600 change_state(s, lcp, next_state);
3601 }
3602 else
3603 {
3604 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3605 STAT(session_timeout);
3606 }
3607
3608 s_actions++;
3609 }
3610
3611 if (session[s].die)
3612 continue;
3613 }
3614
3615 if (sess_local[s].ipcp.restart <= time_now)
3616 {
3617 int next_state = session[s].ppp.ipcp;
3618 switch (session[s].ppp.ipcp)
3619 {
3620 case RequestSent:
3621 case AckReceived:
3622 next_state = RequestSent;
3623
3624 case AckSent:
3625 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3626 {
3627 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3628 sendipcp(s, session[s].tunnel);
3629 change_state(s, ipcp, next_state);
3630 }
3631 else
3632 {
3633 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3634 STAT(session_timeout);
3635 }
3636
3637 s_actions++;
3638 }
3639
3640 if (session[s].die)
3641 continue;
3642 }
3643
3644 if (sess_local[s].ipv6cp.restart <= time_now)
3645 {
3646 int next_state = session[s].ppp.ipv6cp;
3647 switch (session[s].ppp.ipv6cp)
3648 {
3649 case RequestSent:
3650 case AckReceived:
3651 next_state = RequestSent;
3652
3653 case AckSent:
3654 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3655 {
3656 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3657 sendipv6cp(s, session[s].tunnel);
3658 change_state(s, ipv6cp, next_state);
3659 }
3660 else
3661 {
3662 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3663 change_state(s, ipv6cp, Stopped);
3664 }
3665
3666 s_actions++;
3667 }
3668 }
3669
3670 if (sess_local[s].ccp.restart <= time_now)
3671 {
3672 int next_state = session[s].ppp.ccp;
3673 switch (session[s].ppp.ccp)
3674 {
3675 case RequestSent:
3676 case AckReceived:
3677 next_state = RequestSent;
3678
3679 case AckSent:
3680 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3681 {
3682 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3683 sendccp(s, session[s].tunnel);
3684 change_state(s, ccp, next_state);
3685 }
3686 else
3687 {
3688 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3689 change_state(s, ccp, Stopped);
3690 }
3691
3692 s_actions++;
3693 }
3694 }
3695
3696 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3697 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3698 {
3699 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3700 STAT(session_timeout);
3701 s_actions++;
3702 continue;
3703 }
3704
3705 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3706 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3707 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3708 {
3709 uint8_t b[MAXETHER];
3710
3711 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3712 if (!q) continue;
3713
3714 *q = EchoReq;
3715 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3716 *(uint16_t *)(q + 2) = htons(8); // Length
3717 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3718
3719 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3720 (int)(time_now - session[s].last_packet));
3721
3722 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3723 sess_local[s].last_echo = time_now;
3724 s_actions++;
3725 }
3726
3727 // Drop sessions who have reached session_timeout seconds
3728 if (session[s].session_timeout)
3729 {
3730 bundleidt bid = session[s].bundle;
3731 if (bid)
3732 {
3733 if (time_now - bundle[bid].last_check >= 1)
3734 {
3735 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3736 bundle[bid].last_check = time_now;
3737 if (bundle[bid].online_time >= session[s].session_timeout)
3738 {
3739 int ses;
3740 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3741 {
3742 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3743 s_actions++;
3744 continue;
3745 }
3746 }
3747 }
3748 }
3749 else if (time_now - session[s].opened >= session[s].session_timeout)
3750 {
3751 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3752 s_actions++;
3753 continue;
3754 }
3755 }
3756
3757 // Drop sessions who have reached idle_timeout seconds
3758 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3759 {
3760 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3761 STAT(session_timeout);
3762 s_actions++;
3763 continue;
3764 }
3765
3766 // Check for actions requested from the CLI
3767 if ((a = cli_session_actions[s].action))
3768 {
3769 int send = 0;
3770
3771 cli_session_actions[s].action = 0;
3772 if (a & CLI_SESS_KILL)
3773 {
3774 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3775 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3776 a = 0; // dead, no need to check for other actions
3777 s_actions++;
3778 }
3779
3780 if (a & CLI_SESS_NOSNOOP)
3781 {
3782 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3783 session[s].snoop_ip = 0;
3784 session[s].snoop_port = 0;
3785 s_actions++;
3786 send++;
3787 }
3788 else if (a & CLI_SESS_SNOOP)
3789 {
3790 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3791 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3792 cli_session_actions[s].snoop_port);
3793
3794 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3795 session[s].snoop_port = cli_session_actions[s].snoop_port;
3796 s_actions++;
3797 send++;
3798 }
3799
3800 if (a & CLI_SESS_NOTHROTTLE)
3801 {
3802 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3803 throttle_session(s, 0, 0);
3804 s_actions++;
3805 send++;
3806 }
3807 else if (a & CLI_SESS_THROTTLE)
3808 {
3809 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3810 cli_session_actions[s].throttle_in,
3811 cli_session_actions[s].throttle_out);
3812
3813 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3814 s_actions++;
3815 send++;
3816 }
3817
3818 if (a & CLI_SESS_NOFILTER)
3819 {
3820 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3821 filter_session(s, 0, 0);
3822 s_actions++;
3823 send++;
3824 }
3825 else if (a & CLI_SESS_FILTER)
3826 {
3827 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3828 cli_session_actions[s].filter_in,
3829 cli_session_actions[s].filter_out);
3830
3831 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3832 s_actions++;
3833 send++;
3834 }
3835
3836 if (send)
3837 cluster_send_session(s);
3838 }
3839
3840 // RADIUS interim accounting
3841 if (config->radius_accounting && config->radius_interim > 0
3842 && session[s].ip && !session[s].walled_garden
3843 && !sess_local[s].radius // RADIUS already in progress
3844 && time_now - sess_local[s].last_interim >= config->radius_interim
3845 && session[s].flags & SESSION_STARTED)
3846 {
3847 int rad = radiusnew(s);
3848 if (!rad)
3849 {
3850 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3851 STAT(radius_overflow);
3852 continue;
3853 }
3854
3855 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3856 session[s].user, session[s].unique_id);
3857
3858 radiussend(rad, RADIUSINTERIM);
3859 sess_local[s].last_interim = time_now;
3860 s_actions++;
3861 }
3862 }
3863
3864 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3865 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3866 }
3867
3868 //
3869 // Are we in the middle of a tunnel update, or radius
3870 // requests??
3871 //
3872 static int still_busy(void)
3873 {
3874 int i;
3875 static clockt last_talked = 0;
3876 static clockt start_busy_wait = 0;
3877
3878 #ifdef BGP
3879 static time_t stopped_bgp = 0;
3880 if (bgp_configured)
3881 {
3882 if (!stopped_bgp)
3883 {
3884 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3885
3886 for (i = 0; i < BGP_NUM_PEERS; i++)
3887 if (bgp_peers[i].state == Established)
3888 bgp_stop(&bgp_peers[i]);
3889
3890 stopped_bgp = time_now;
3891
3892 if (!config->cluster_iam_master)
3893 {
3894 // we don't want to become master
3895 cluster_send_ping(0);
3896
3897 return 1;
3898 }
3899 }
3900
3901 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3902 return 1;
3903 }
3904 #endif /* BGP */
3905
3906 if (!config->cluster_iam_master)
3907 return 0;
3908
3909 if (main_quit == QUIT_SHUTDOWN)
3910 {
3911 static int dropped = 0;
3912 if (!dropped)
3913 {
3914 int i;
3915
3916 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3917 for (i = 1; i < MAXTUNNEL; i++)
3918 if (tunnel[i].ip || tunnel[i].state)
3919 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3920
3921 dropped = 1;
3922 }
3923 }
3924
3925 if (start_busy_wait == 0)
3926 start_busy_wait = TIME;
3927
3928 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3929 {
3930 if (!tunnel[i].controlc)
3931 continue;
3932
3933 if (last_talked != TIME)
3934 {
3935 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3936 last_talked = TIME;
3937 }
3938 return 1;
3939 }
3940
3941 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3942 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3943 {
3944 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3945 return 0;
3946 }
3947
3948 for (i = 1; i < MAXRADIUS; i++)
3949 {
3950 if (radius[i].state == RADIUSNULL)
3951 continue;
3952 if (radius[i].state == RADIUSWAIT)
3953 continue;
3954
3955 if (last_talked != TIME)
3956 {
3957 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3958 last_talked = TIME;
3959 }
3960 return 1;
3961 }
3962
3963 return 0;
3964 }
3965
3966 #ifdef HAVE_EPOLL
3967 # include <sys/epoll.h>
3968 #else
3969 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3970 # include "fake_epoll.h"
3971 #endif
3972
3973 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
3974 #define BASE_FDS (9 + MAX_UDPFD)
3975
3976 // additional polled fds
3977 #ifdef BGP
3978 # define EXTRA_FDS BGP_NUM_PEERS
3979 #else
3980 # define EXTRA_FDS 0
3981 #endif
3982
3983 // main loop - gets packets on tun or udp and processes them
3984 static void mainloop(void)
3985 {
3986 int i, j;
3987 uint8_t buf[65536];
3988 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3989 // and the forwarded pppoe session
3990 int size_bufp = sizeof(buf) - 32;
3991 clockt next_cluster_ping = 0; // send initial ping immediately
3992 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3993 int maxevent = sizeof(events)/sizeof(*events);
3994
3995 if ((epollfd = epoll_create(maxevent)) < 0)
3996 {
3997 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3998 exit(1);
3999 }
4000
4001 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",
4002 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4003
4004 /* setup our fds to poll for input */
4005 {
4006 static struct event_data d[BASE_FDS];
4007 struct epoll_event e;
4008
4009 e.events = EPOLLIN;
4010 i = 0;
4011
4012 if (clifd >= 0)
4013 {
4014 d[i].type = FD_TYPE_CLI;
4015 e.data.ptr = &d[i++];
4016 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4017 }
4018
4019 d[i].type = FD_TYPE_CLUSTER;
4020 e.data.ptr = &d[i++];
4021 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4022
4023 d[i].type = FD_TYPE_TUN;
4024 e.data.ptr = &d[i++];
4025 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4026
4027 d[i].type = FD_TYPE_CONTROL;
4028 e.data.ptr = &d[i++];
4029 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4030
4031 d[i].type = FD_TYPE_DAE;
4032 e.data.ptr = &d[i++];
4033 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4034
4035 d[i].type = FD_TYPE_NETLINK;
4036 e.data.ptr = &d[i++];
4037 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4038
4039 d[i].type = FD_TYPE_PPPOEDISC;
4040 e.data.ptr = &d[i++];
4041 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4042
4043 d[i].type = FD_TYPE_PPPOESESS;
4044 e.data.ptr = &d[i++];
4045 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4046
4047 for (j = 0; j < config->nbudpfd; j++)
4048 {
4049 d[i].type = FD_TYPE_UDP;
4050 d[i].index = j;
4051 e.data.ptr = &d[i++];
4052 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4053 }
4054 }
4055
4056 #ifdef BGP
4057 signal(SIGPIPE, SIG_IGN);
4058 bgp_setup(config->as_number);
4059 if (config->bind_address)
4060 bgp_add_route(config->bind_address, 0xffffffff);
4061
4062 for (i = 0; i < BGP_NUM_PEERS; i++)
4063 {
4064 if (config->neighbour[i].name[0])
4065 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4066 config->neighbour[i].as, config->neighbour[i].keepalive,
4067 config->neighbour[i].hold, config->neighbour[i].update_source,
4068 0); /* 0 = routing disabled */
4069 }
4070 #endif /* BGP */
4071
4072 while (!main_quit || still_busy())
4073 {
4074 int more = 0;
4075 int n;
4076
4077
4078 if (main_reload)
4079 {
4080 main_reload = 0;
4081 read_config_file();
4082 config->reload_config++;
4083 }
4084
4085 if (config->reload_config)
4086 {
4087 config->reload_config = 0;
4088 update_config();
4089 }
4090
4091 #ifdef BGP
4092 bgp_set_poll();
4093 #endif /* BGP */
4094
4095 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4096 STAT(select_called);
4097
4098 TIME = now(NULL);
4099 if (n < 0)
4100 {
4101 if (errno == EINTR ||
4102 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4103 continue;
4104
4105 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4106 break; // exit
4107 }
4108
4109 if (n)
4110 {
4111 struct sockaddr_in addr;
4112 struct in_addr local;
4113 socklen_t alen;
4114 int c, s;
4115 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4116 int pppoesess_ready = 0;
4117 int pppoesess_pkts = 0;
4118 int tun_ready = 0;
4119 int cluster_ready = 0;
4120 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4121 int tun_pkts = 0;
4122 int cluster_pkts = 0;
4123 #ifdef BGP
4124 uint32_t bgp_events[BGP_NUM_PEERS];
4125 memset(bgp_events, 0, sizeof(bgp_events));
4126 #endif /* BGP */
4127
4128 for (c = n, i = 0; i < c; i++)
4129 {
4130 struct event_data *d = events[i].data.ptr;
4131
4132 switch (d->type)
4133 {
4134 case FD_TYPE_CLI: // CLI connections
4135 {
4136 int cli;
4137
4138 alen = sizeof(addr);
4139 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4140 {
4141 cli_do(cli);
4142 close(cli);
4143 }
4144 else
4145 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4146
4147 n--;
4148 break;
4149 }
4150
4151 // these are handled below, with multiple interleaved reads
4152 case FD_TYPE_CLUSTER: cluster_ready++; break;
4153 case FD_TYPE_TUN: tun_ready++; break;
4154 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4155 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4156
4157 case FD_TYPE_PPPOEDISC: // pppoe discovery
4158 s = read(pppoediscfd, p, size_bufp);
4159 if (s > 0) process_pppoe_disc(p, s);
4160 n--;
4161 break;
4162
4163 case FD_TYPE_CONTROL: // nsctl commands
4164 alen = sizeof(addr);
4165 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4166 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4167 n--;
4168 break;
4169
4170 case FD_TYPE_DAE: // DAE requests
4171 alen = sizeof(addr);
4172 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4173 if (s > 0) processdae(p, s, &addr, alen, &local);
4174 n--;
4175 break;
4176
4177 case FD_TYPE_RADIUS: // RADIUS response
4178 alen = sizeof(addr);
4179 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4180 if (s >= 0 && config->cluster_iam_master)
4181 {
4182 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4183 addr.sin_addr.s_addr == config->radiusserver[1])
4184 processrad(p, s, d->index);
4185 else
4186 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4187 fmtaddr(addr.sin_addr.s_addr, 0));
4188 }
4189
4190 n--;
4191 break;
4192
4193 #ifdef BGP
4194 case FD_TYPE_BGP:
4195 bgp_events[d->index] = events[i].events;
4196 n--;
4197 break;
4198 #endif /* BGP */
4199
4200 case FD_TYPE_NETLINK:
4201 {
4202 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4203 s = netlink_recv(p, size_bufp);
4204 if (nh->nlmsg_type == NLMSG_ERROR)
4205 {
4206 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4207 if (errmsg->error)
4208 {
4209 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4210 {
4211 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4212 exit(1);
4213 }
4214 else
4215 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4216 }
4217 // else it's a ack
4218 }
4219 else
4220 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);
4221 n--;
4222 break;
4223 }
4224
4225 default:
4226 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4227 }
4228 }
4229
4230 #ifdef BGP
4231 bgp_process(bgp_events);
4232 #endif /* BGP */
4233
4234 for (c = 0; n && c < config->multi_read_count; c++)
4235 {
4236 for (j = 0; j < config->nbudpfd; j++)
4237 {
4238 // L2TP and L2TP REMOTE LNS
4239 if (udp_ready[j])
4240 {
4241 alen = sizeof(addr);
4242 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4243 {
4244 processudp(p, s, &addr, j);
4245 udp_pkts[j]++;
4246 }
4247 else
4248 {
4249 udp_ready[j] = 0;
4250 n--;
4251 }
4252 }
4253 }
4254
4255 // incoming IP
4256 if (tun_ready)
4257 {
4258 if ((s = read(tunfd, p, size_bufp)) > 0)
4259 {
4260 processtun(p, s);
4261 tun_pkts++;
4262 }
4263 else
4264 {
4265 tun_ready = 0;
4266 n--;
4267 }
4268 }
4269
4270 // pppoe session
4271 if (pppoesess_ready)
4272 {
4273 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4274 {
4275 process_pppoe_sess(p, s);
4276 pppoesess_pkts++;
4277 }
4278 else
4279 {
4280 pppoesess_ready = 0;
4281 n--;
4282 }
4283 }
4284
4285 // cluster
4286 if (cluster_ready)
4287 {
4288 alen = sizeof(addr);
4289 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4290 {
4291 processcluster(p, s, addr.sin_addr.s_addr);
4292 cluster_pkts++;
4293 }
4294 else
4295 {
4296 cluster_ready = 0;
4297 n--;
4298 }
4299 }
4300 }
4301
4302 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4303 STAT(multi_read_used);
4304
4305 if (c >= config->multi_read_count)
4306 {
4307 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4308 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4309 STAT(multi_read_exceeded);
4310 more++;
4311 }
4312 }
4313 #ifdef BGP
4314 else
4315 /* no event received, but timers could still have expired */
4316 bgp_process_peers_timers();
4317 #endif /* BGP */
4318
4319 if (time_changed)
4320 {
4321 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4322
4323 // Log current traffic stats
4324 snprintf(config->bandwidth, sizeof(config->bandwidth),
4325 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4326 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4327 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4328 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4329
4330 udp_tx = udp_rx = 0;
4331 udp_rx_pkt = eth_rx_pkt = 0;
4332 eth_tx = eth_rx = 0;
4333 time_changed = 0;
4334
4335 if (config->dump_speed)
4336 printf("%s\n", config->bandwidth);
4337
4338 // Update the internal time counter
4339 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4340
4341 {
4342 // Run timer hooks
4343 struct param_timer p = { time_now };
4344 run_plugins(PLUGIN_TIMER, &p);
4345 }
4346 }
4347
4348 // Runs on every machine (master and slaves).
4349 if (next_cluster_ping <= TIME)
4350 {
4351 // Check to see which of the cluster is still alive..
4352
4353 cluster_send_ping(basetime); // Only does anything if we're a slave
4354 cluster_check_master(); // ditto.
4355
4356 cluster_heartbeat(); // Only does anything if we're a master.
4357 cluster_check_slaves(); // ditto.
4358
4359 master_update_counts(); // If we're a slave, send our byte counters to our master.
4360
4361 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4362 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4363 else
4364 next_cluster_ping = TIME + config->cluster_hb_interval;
4365 }
4366
4367 if (!config->cluster_iam_master)
4368 continue;
4369
4370 // Run token bucket filtering queue..
4371 // Only run it every 1/10th of a second.
4372 {
4373 static clockt last_run = 0;
4374 if (last_run != TIME)
4375 {
4376 last_run = TIME;
4377 tbf_run_timer();
4378 }
4379 }
4380
4381 // Handle timeouts, retries etc.
4382 {
4383 static double last_clean = 0;
4384 double this_clean;
4385 double diff;
4386
4387 TIME = now(&this_clean);
4388 diff = this_clean - last_clean;
4389
4390 // Run during idle time (after we've handled
4391 // all incoming packets) or every 1/10th sec
4392 if (!more || diff > 0.1)
4393 {
4394 regular_cleanups(diff);
4395 last_clean = this_clean;
4396 }
4397 }
4398
4399 if (*config->accounting_dir)
4400 {
4401 static clockt next_acct = 0;
4402 static clockt next_shut_acct = 0;
4403
4404 if (next_acct <= TIME)
4405 {
4406 // Dump accounting data
4407 next_acct = TIME + ACCT_TIME;
4408 next_shut_acct = TIME + ACCT_SHUT_TIME;
4409 dump_acct_info(1);
4410 }
4411 else if (next_shut_acct <= TIME)
4412 {
4413 // Dump accounting data for shutdown sessions
4414 next_shut_acct = TIME + ACCT_SHUT_TIME;
4415 if (shut_acct_n)
4416 dump_acct_info(0);
4417 }
4418 }
4419 }
4420
4421 // Are we the master and shutting down??
4422 if (config->cluster_iam_master)
4423 cluster_heartbeat(); // Flush any queued changes..
4424
4425 // Ok. Notify everyone we're shutting down. If we're
4426 // the master, this will force an election.
4427 cluster_send_ping(0);
4428
4429 //
4430 // Important!!! We MUST not process any packets past this point!
4431 LOG(1, 0, 0, "Shutdown complete\n");
4432 }
4433
4434 static void stripdomain(char *host)
4435 {
4436 char *p;
4437
4438 if ((p = strchr(host, '.')))
4439 {
4440 char *domain = 0;
4441 char _domain[1024];
4442
4443 // strip off domain
4444 FILE *resolv = fopen("/etc/resolv.conf", "r");
4445 if (resolv)
4446 {
4447 char buf[1024];
4448 char *b;
4449
4450 while (fgets(buf, sizeof(buf), resolv))
4451 {
4452 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4453 continue;
4454
4455 if (!isspace(buf[6]))
4456 continue;
4457
4458 b = buf + 7;
4459 while (isspace(*b)) b++;
4460
4461 if (*b)
4462 {
4463 char *d = b;
4464 while (*b && !isspace(*b)) b++;
4465 *b = 0;
4466 if (buf[0] == 'd') // domain is canonical
4467 {
4468 domain = d;
4469 break;
4470 }
4471
4472 // first search line
4473 if (!domain)
4474 {
4475 // hold, may be subsequent domain line
4476 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4477 domain = _domain;
4478 }
4479 }
4480 }
4481
4482 fclose(resolv);
4483 }
4484
4485 if (domain)
4486 {
4487 int hl = strlen(host);
4488 int dl = strlen(domain);
4489 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4490 host[hl -dl - 1] = 0;
4491 }
4492 else
4493 {
4494 *p = 0; // everything after first dot
4495 }
4496 }
4497 }
4498
4499 // Init data structures
4500 static void initdata(int optdebug, char *optconfig)
4501 {
4502 int i;
4503
4504 if (!(config = shared_malloc(sizeof(configt))))
4505 {
4506 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4507 exit(1);
4508 }
4509
4510 memset(config, 0, sizeof(configt));
4511 time(&config->start_time);
4512 strncpy(config->config_file, optconfig, strlen(optconfig));
4513 config->debug = optdebug;
4514 config->num_tbfs = MAXTBFS;
4515 config->rl_rate = 28; // 28kbps
4516 config->cluster_mcast_ttl = 1;
4517 config->cluster_master_min_adv = 1;
4518 config->ppp_restart_time = 3;
4519 config->ppp_max_configure = 10;
4520 config->ppp_max_failure = 5;
4521 config->kill_timedout_sessions = 1;
4522 strcpy(config->random_device, RANDOMDEVICE);
4523 // Set default value echo_timeout and idle_echo_timeout
4524 config->echo_timeout = ECHO_TIMEOUT;
4525 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4526
4527 log_stream = stderr;
4528
4529 #ifdef RINGBUFFER
4530 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4531 {
4532 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4533 exit(1);
4534 }
4535 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4536 #endif
4537
4538 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4539 {
4540 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4541 exit(1);
4542 }
4543 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4544 {
4545 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4546 exit(1);
4547 }
4548 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4549 {
4550 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4551 exit(1);
4552 }
4553 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4554 {
4555 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4556 exit(1);
4557 }
4558 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4559 {
4560 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4561 exit(1);
4562 }
4563
4564 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4565 {
4566 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4567 exit(1);
4568 }
4569
4570 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4571 {
4572 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4573 exit(1);
4574 }
4575
4576 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4577 {
4578 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4579 exit(1);
4580 }
4581
4582 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4583 {
4584 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4585 exit(1);
4586 }
4587 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4588
4589 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4590 {
4591 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4592 exit(1);
4593 }
4594 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4595
4596 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4597 {
4598 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4599 exit(1);
4600 }
4601 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4602
4603 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4604 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4605 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4606 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4607 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4608
4609 // Put all the sessions on the free list marked as undefined.
4610 for (i = 1; i < MAXSESSION; i++)
4611 {
4612 session[i].next = i + 1;
4613 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4614 }
4615 session[MAXSESSION - 1].next = 0;
4616 sessionfree = 1;
4617
4618 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4619 for (i = 1; i < MAXTUNNEL; i++)
4620 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4621
4622 for (i = 1; i < MAXBUNDLE; i++) {
4623 bundle[i].state = BUNDLEUNDEF;
4624 }
4625
4626 if (!*hostname)
4627 {
4628 // Grab my hostname unless it's been specified
4629 gethostname(hostname, sizeof(hostname));
4630 stripdomain(hostname);
4631 }
4632
4633 _statistics->start_time = _statistics->last_reset = time(NULL);
4634
4635 #ifdef BGP
4636 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4637 {
4638 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4639 exit(1);
4640 }
4641 #endif /* BGP */
4642
4643 lac_initremotelnsdata();
4644 }
4645
4646 static int assign_ip_address(sessionidt s)
4647 {
4648 uint32_t i;
4649 int best = -1;
4650 time_t best_time = time_now;
4651 char *u = session[s].user;
4652 char reuse = 0;
4653
4654
4655 CSTAT(assign_ip_address);
4656
4657 for (i = 1; i < ip_pool_size; i++)
4658 {
4659 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4660 continue;
4661
4662 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4663 {
4664 best = i;
4665 reuse = 1;
4666 break;
4667 }
4668
4669 if (ip_address_pool[i].last < best_time)
4670 {
4671 best = i;
4672 if (!(best_time = ip_address_pool[i].last))
4673 break; // never used, grab this one
4674 }
4675 }
4676
4677 if (best < 0)
4678 {
4679 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4680 return 0;
4681 }
4682
4683 session[s].ip = ip_address_pool[best].address;
4684 session[s].ip_pool_index = best;
4685 ip_address_pool[best].assigned = 1;
4686 ip_address_pool[best].last = time_now;
4687 ip_address_pool[best].session = s;
4688 if (session[s].walled_garden)
4689 /* Don't track addresses of users in walled garden (note: this
4690 means that their address isn't "sticky" even if they get
4691 un-gardened). */
4692 ip_address_pool[best].user[0] = 0;
4693 else
4694 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4695
4696 STAT(ip_allocated);
4697 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4698 reuse ? "Reusing" : "Allocating", best);
4699
4700 return 1;
4701 }
4702
4703 static void free_ip_address(sessionidt s)
4704 {
4705 int i = session[s].ip_pool_index;
4706
4707
4708 CSTAT(free_ip_address);
4709
4710 if (!session[s].ip)
4711 return; // what the?
4712
4713 if (i < 0) // Is this actually part of the ip pool?
4714 i = 0;
4715
4716 STAT(ip_freed);
4717 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4718 session[s].ip = 0;
4719 ip_address_pool[i].assigned = 0;
4720 ip_address_pool[i].session = 0;
4721 ip_address_pool[i].last = time_now;
4722 }
4723
4724 //
4725 // Fsck the address pool against the session table.
4726 // Normally only called when we become a master.
4727 //
4728 // This isn't perfect: We aren't keep tracking of which
4729 // users used to have an IP address.
4730 //
4731 void rebuild_address_pool(void)
4732 {
4733 int i;
4734
4735 //
4736 // Zero the IP pool allocation, and build
4737 // a map from IP address to pool index.
4738 for (i = 1; i < MAXIPPOOL; ++i)
4739 {
4740 ip_address_pool[i].assigned = 0;
4741 ip_address_pool[i].session = 0;
4742 if (!ip_address_pool[i].address)
4743 continue;
4744
4745 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4746 }
4747
4748 for (i = 0; i < MAXSESSION; ++i)
4749 {
4750 int ipid;
4751 if (!(session[i].opened && session[i].ip))
4752 continue;
4753
4754 ipid = - lookup_ipmap(htonl(session[i].ip));
4755
4756 if (session[i].ip_pool_index < 0)
4757 {
4758 // Not allocated out of the pool.
4759 if (ipid < 1) // Not found in the pool either? good.
4760 continue;
4761
4762 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4763 i, fmtaddr(session[i].ip, 0), ipid);
4764
4765 // Fall through and process it as part of the pool.
4766 }
4767
4768
4769 if (ipid > MAXIPPOOL || ipid < 0)
4770 {
4771 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4772 ipid = -1;
4773 session[i].ip_pool_index = ipid;
4774 continue;
4775 }
4776
4777 ip_address_pool[ipid].assigned = 1;
4778 ip_address_pool[ipid].session = i;
4779 ip_address_pool[ipid].last = time_now;
4780 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4781 session[i].ip_pool_index = ipid;
4782 cache_ipmap(session[i].ip, i); // Fix the ip map.
4783 }
4784 }
4785
4786 //
4787 // Fix the address pool to match a changed session.
4788 // (usually when the master sends us an update).
4789 static void fix_address_pool(int sid)
4790 {
4791 int ipid;
4792
4793 ipid = session[sid].ip_pool_index;
4794
4795 if (ipid > ip_pool_size)
4796 return; // Ignore it. rebuild_address_pool will fix it up.
4797
4798 if (ip_address_pool[ipid].address != session[sid].ip)
4799 return; // Just ignore it. rebuild_address_pool will take care of it.
4800
4801 ip_address_pool[ipid].assigned = 1;
4802 ip_address_pool[ipid].session = sid;
4803 ip_address_pool[ipid].last = time_now;
4804 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4805 }
4806
4807 //
4808 // Add a block of addresses to the IP pool to hand out.
4809 //
4810 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4811 {
4812 int i;
4813 if (prefixlen == 0)
4814 prefixlen = 32; // Host route only.
4815
4816 addr &= 0xffffffff << (32 - prefixlen);
4817
4818 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4819 return ;
4820
4821 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4822 {
4823 if ((i & 0xff) == 0 || (i&0xff) == 255)
4824 continue; // Skip 0 and broadcast addresses.
4825
4826 ip_address_pool[ip_pool_size].address = i;
4827 ip_address_pool[ip_pool_size].assigned = 0;
4828 ++ip_pool_size;
4829 if (ip_pool_size >= MAXIPPOOL)
4830 {
4831 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4832 return;
4833 }
4834 }
4835 }
4836
4837 // Initialize the IP address pool
4838 static void initippool()
4839 {
4840 FILE *f;
4841 char *p;
4842 char buf[4096];
4843 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4844
4845 if (!(f = fopen(IPPOOLFILE, "r")))
4846 {
4847 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4848 exit(1);
4849 }
4850
4851 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4852 {
4853 char *pool = buf;
4854 buf[4095] = 0; // Force it to be zero terminated/
4855
4856 if (*buf == '#' || *buf == '\n')
4857 continue; // Skip comments / blank lines
4858 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4859 if ((p = (char *)strchr(buf, ':')))
4860 {
4861 in_addr_t src;
4862 *p = '\0';
4863 src = inet_addr(buf);
4864 if (src == INADDR_NONE)
4865 {
4866 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4867 exit(1);
4868 }
4869 // This entry is for a specific IP only
4870 if (src != config->bind_address)
4871 continue;
4872 *p = ':';
4873 pool = p+1;
4874 }
4875 if ((p = (char *)strchr(pool, '/')))
4876 {
4877 // It's a range
4878 int numbits = 0;
4879 in_addr_t start = 0;
4880
4881 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4882 *p++ = 0;
4883 if (!*p || !(numbits = atoi(p)))
4884 {
4885 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4886 continue;
4887 }
4888 start = ntohl(inet_addr(pool));
4889
4890 // Add a static route for this pool
4891 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4892 fmtaddr(htonl(start), 0), numbits);
4893
4894 routeset(0, start, numbits, 0, 1);
4895
4896 add_to_ip_pool(start, numbits);
4897 }
4898 else
4899 {
4900 // It's a single ip address
4901 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4902 }
4903 }
4904 fclose(f);
4905 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4906 }
4907
4908 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4909 {
4910 struct sockaddr_in snoop_addr = {0};
4911 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4912 return;
4913
4914 snoop_addr.sin_family = AF_INET;
4915 snoop_addr.sin_addr.s_addr = destination;
4916 snoop_addr.sin_port = ntohs(port);
4917
4918 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4919 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4920 htons(snoop_addr.sin_port));
4921
4922 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4923 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4924
4925 STAT(packets_snooped);
4926 }
4927
4928 static int dump_session(FILE **f, sessiont *s)
4929 {
4930 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4931 return 1;
4932
4933 if (!*f)
4934 {
4935 char filename[1024];
4936 char timestr[64];
4937 time_t now = time(NULL);
4938
4939 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4940 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4941
4942 if (!(*f = fopen(filename, "w")))
4943 {
4944 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4945 return 0;
4946 }
4947
4948 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4949 if(config->account_all_origin)
4950 {
4951 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4952 "# host: %s\n"
4953 "# endpoint: %s\n"
4954 "# time: %ld\n"
4955 "# uptime: %ld\n"
4956 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
4957 hostname,
4958 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4959 now,
4960 now - basetime);
4961 }
4962 else
4963 {
4964 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4965 "# host: %s\n"
4966 "# endpoint: %s\n"
4967 "# time: %ld\n"
4968 "# uptime: %ld\n"
4969 "# format: username ip qos uptxoctets downrxoctets\n",
4970 hostname,
4971 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4972 now,
4973 now - basetime);
4974 }
4975 }
4976
4977 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4978 if(config->account_all_origin)
4979 {
4980 fprintf(*f, "%s %s %d %u %u %s\n",
4981 s->user, // username
4982 fmtaddr(htonl(s->ip), 0), // ip
4983 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4984 (uint32_t) s->cin_delta, // uptxoctets
4985 (uint32_t) s->cout_delta, // downrxoctets
4986 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
4987 }
4988 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
4989 {
4990 fprintf(*f, "%s %s %d %u %u\n",
4991 s->user, // username
4992 fmtaddr(htonl(s->ip), 0), // ip
4993 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4994 (uint32_t) s->cin_delta, // uptxoctets
4995 (uint32_t) s->cout_delta); // downrxoctets
4996 }
4997
4998 s->cin_delta = s->cout_delta = 0;
4999
5000 return 1;
5001 }
5002
5003 static void dump_acct_info(int all)
5004 {
5005 int i;
5006 FILE *f = NULL;
5007
5008
5009 CSTAT(dump_acct_info);
5010
5011 if (shut_acct_n)
5012 {
5013 for (i = 0; i < shut_acct_n; i++)
5014 dump_session(&f, &shut_acct[i]);
5015
5016 shut_acct_n = 0;
5017 }
5018
5019 if (all)
5020 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5021 dump_session(&f, &session[i]);
5022
5023 if (f)
5024 fclose(f);
5025 }
5026
5027 // Main program
5028 int main(int argc, char *argv[])
5029 {
5030 int i;
5031 int optdebug = 0;
5032 char *optconfig = CONFIGFILE;
5033
5034 time(&basetime); // start clock
5035
5036 // scan args
5037 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5038 {
5039 switch (i)
5040 {
5041 case 'd':
5042 if (fork()) exit(0);
5043 setsid();
5044 freopen("/dev/null", "r", stdin);
5045 freopen("/dev/null", "w", stdout);
5046 freopen("/dev/null", "w", stderr);
5047 break;
5048 case 'v':
5049 optdebug++;
5050 break;
5051 case 'c':
5052 optconfig = optarg;
5053 break;
5054 case 'h':
5055 snprintf(hostname, sizeof(hostname), "%s", optarg);
5056 break;
5057 default:
5058 printf("Args are:\n"
5059 "\t-d\t\tDetach from terminal\n"
5060 "\t-c <file>\tConfig file\n"
5061 "\t-h <hostname>\tForce hostname\n"
5062 "\t-v\t\tDebug\n");
5063
5064 return (0);
5065 break;
5066 }
5067 }
5068
5069 // Start the timer routine off
5070 time(&time_now);
5071 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5072
5073 initplugins();
5074 initdata(optdebug, optconfig);
5075
5076 init_cli();
5077 read_config_file();
5078 /* set hostname /after/ having read the config file */
5079 if (*config->hostname)
5080 strcpy(hostname, config->hostname);
5081 cli_init_complete(hostname);
5082 update_config();
5083 init_tbf(config->num_tbfs);
5084
5085 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5086 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5087 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5088 {
5089 struct rlimit rlim;
5090 rlim.rlim_cur = RLIM_INFINITY;
5091 rlim.rlim_max = RLIM_INFINITY;
5092 // Remove the maximum core size
5093 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5094 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5095
5096 // Make core dumps go to /tmp
5097 chdir("/tmp");
5098 }
5099
5100 if (config->scheduler_fifo)
5101 {
5102 int ret;
5103 struct sched_param params = {0};
5104 params.sched_priority = 1;
5105
5106 if (get_nprocs() < 2)
5107 {
5108 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5109 config->scheduler_fifo = 0;
5110 }
5111 else
5112 {
5113 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5114 {
5115 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5116 }
5117 else
5118 {
5119 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5120 config->scheduler_fifo = 0;
5121 }
5122 }
5123 }
5124
5125 initnetlink();
5126
5127 /* Set up the cluster communications port. */
5128 if (cluster_init() < 0)
5129 exit(1);
5130
5131 inittun();
5132 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5133
5134 if (*config->pppoe_if_to_bind)
5135 {
5136 init_pppoe();
5137 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5138 }
5139
5140 if (!config->nbmultiaddress)
5141 {
5142 config->bind_n_address[0] = config->bind_address;
5143 config->nbmultiaddress++;
5144 }
5145 config->nbudpfd = config->nbmultiaddress;
5146 for (i = 0; i < config->nbudpfd; i++)
5147 initudp(&udpfd[i], config->bind_n_address[i]);
5148 initlacudp();
5149 config->indexlacudpfd = config->nbudpfd;
5150 udpfd[config->indexlacudpfd] = udplacfd;
5151 config->nbudpfd++;
5152
5153 initcontrol();
5154 initdae();
5155
5156 // Intercept
5157 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5158
5159 initrad();
5160 initippool();
5161
5162 // seed prng
5163 {
5164 unsigned seed = time_now ^ getpid();
5165 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5166 srand(seed);
5167 }
5168
5169 signal(SIGHUP, sighup_handler);
5170 signal(SIGCHLD, sigchild_handler);
5171 signal(SIGTERM, shutdown_handler);
5172 signal(SIGINT, shutdown_handler);
5173 signal(SIGQUIT, shutdown_handler);
5174
5175 // Prevent us from getting paged out
5176 if (config->lock_pages)
5177 {
5178 if (!mlockall(MCL_CURRENT))
5179 LOG(1, 0, 0, "Locking pages into memory\n");
5180 else
5181 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5182 }
5183
5184 mainloop();
5185
5186 /* remove plugins (so cleanup code gets run) */
5187 plugins_done();
5188
5189 // Remove the PID file if we wrote it
5190 if (config->wrote_pid && *config->pid_file == '/')
5191 unlink(config->pid_file);
5192
5193 /* kill CLI children */
5194 signal(SIGTERM, SIG_IGN);
5195 kill(0, SIGTERM);
5196 return 0;
5197 }
5198
5199 static void sighup_handler(int sig)
5200 {
5201 main_reload++;
5202 }
5203
5204 static void shutdown_handler(int sig)
5205 {
5206 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5207 }
5208
5209 static void sigchild_handler(int sig)
5210 {
5211 while (waitpid(-1, NULL, WNOHANG) > 0)
5212 ;
5213 }
5214
5215 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5216 {
5217 MD5_CTX ctx;
5218 *challenge_response = NULL;
5219
5220 if (!*config->l2tp_secret)
5221 {
5222 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5223 return;
5224 }
5225
5226 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5227
5228 *challenge_response = calloc(17, 1);
5229
5230 MD5_Init(&ctx);
5231 MD5_Update(&ctx, &id, 1);
5232 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5233 MD5_Update(&ctx, challenge, challenge_length);
5234 MD5_Final(*challenge_response, &ctx);
5235
5236 return;
5237 }
5238
5239 static int facility_value(char *name)
5240 {
5241 int i;
5242 for (i = 0; facilitynames[i].c_name; i++)
5243 {
5244 if (strcmp(facilitynames[i].c_name, name) == 0)
5245 return facilitynames[i].c_val;
5246 }
5247 return 0;
5248 }
5249
5250 static void update_config()
5251 {
5252 int i;
5253 char *p;
5254 static int timeout = 0;
5255 static int interval = 0;
5256
5257 // Update logging
5258 closelog();
5259 syslog_log = 0;
5260 if (log_stream)
5261 {
5262 if (log_stream != stderr)
5263 fclose(log_stream);
5264
5265 log_stream = NULL;
5266 }
5267
5268 if (*config->log_filename)
5269 {
5270 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5271 {
5272 char *p = config->log_filename + 7;
5273 if (*p)
5274 {
5275 openlog("l2tpns", LOG_PID, facility_value(p));
5276 syslog_log = 1;
5277 }
5278 }
5279 else if (strchr(config->log_filename, '/') == config->log_filename)
5280 {
5281 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5282 {
5283 fseek(log_stream, 0, SEEK_END);
5284 setbuf(log_stream, NULL);
5285 }
5286 else
5287 {
5288 log_stream = stderr;
5289 setbuf(log_stream, NULL);
5290 }
5291 }
5292 }
5293 else
5294 {
5295 log_stream = stderr;
5296 setbuf(log_stream, NULL);
5297 }
5298
5299 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5300 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5301
5302 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5303 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5304 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5305
5306 // reset MRU/MSS globals
5307 MRU = config->l2tp_mtu - L2TP_HDRS;
5308 if (MRU > PPPoE_MRU)
5309 MRU = PPPoE_MRU;
5310
5311 MSS = MRU - TCP_HDRS;
5312
5313 // Update radius
5314 config->numradiusservers = 0;
5315 for (i = 0; i < MAXRADSERVER; i++)
5316 if (config->radiusserver[i])
5317 {
5318 config->numradiusservers++;
5319 // Set radius port: if not set, take the port from the
5320 // first radius server. For the first radius server,
5321 // take the #defined default value from l2tpns.h
5322
5323 // test twice, In case someone works with
5324 // a secondary radius server without defining
5325 // a primary one, this will work even then.
5326 if (i > 0 && !config->radiusport[i])
5327 config->radiusport[i] = config->radiusport[i-1];
5328 if (!config->radiusport[i])
5329 config->radiusport[i] = RADPORT;
5330 }
5331
5332 if (!config->numradiusservers)
5333 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5334
5335 // parse radius_authtypes_s
5336 config->radius_authtypes = config->radius_authprefer = 0;
5337 p = config->radius_authtypes_s;
5338 while (p && *p)
5339 {
5340 char *s = strpbrk(p, " \t,");
5341 int type = 0;
5342
5343 if (s)
5344 {
5345 *s++ = 0;
5346 while (*s == ' ' || *s == '\t')
5347 s++;
5348
5349 if (!*s)
5350 s = 0;
5351 }
5352
5353 if (!strncasecmp("chap", p, strlen(p)))
5354 type = AUTHCHAP;
5355 else if (!strncasecmp("pap", p, strlen(p)))
5356 type = AUTHPAP;
5357 else
5358 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5359
5360 config->radius_authtypes |= type;
5361 if (!config->radius_authprefer)
5362 config->radius_authprefer = type;
5363
5364 p = s;
5365 }
5366
5367 if (!config->radius_authtypes)
5368 {
5369 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5370 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5371 }
5372
5373 // normalise radius_authtypes_s
5374 if (config->radius_authprefer == AUTHPAP)
5375 {
5376 strcpy(config->radius_authtypes_s, "pap");
5377 if (config->radius_authtypes & AUTHCHAP)
5378 strcat(config->radius_authtypes_s, ", chap");
5379 }
5380 else
5381 {
5382 strcpy(config->radius_authtypes_s, "chap");
5383 if (config->radius_authtypes & AUTHPAP)
5384 strcat(config->radius_authtypes_s, ", pap");
5385 }
5386
5387 if (!config->radius_dae_port)
5388 config->radius_dae_port = DAEPORT;
5389
5390 if(!config->bind_portremotelns)
5391 config->bind_portremotelns = L2TPLACPORT;
5392 if(!config->bind_address_remotelns)
5393 config->bind_address_remotelns = INADDR_ANY;
5394
5395 if (*config->bind_multi_address)
5396 {
5397 char *sip = config->bind_multi_address;
5398 char *n = sip;
5399 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5400 config->nbmultiaddress = 0;
5401
5402 while (*sip && (sip < e))
5403 {
5404 in_addr_t ip = 0;
5405 uint8_t u = 0;
5406
5407 while (n < e && (*n == ',' || *n == ' ')) n++;
5408
5409 while (n < e && (isdigit(*n) || *n == '.'))
5410 {
5411 if (*n == '.')
5412 {
5413 ip = (ip << 8) + u;
5414 u = 0;
5415 }
5416 else
5417 u = u * 10 + *n - '0';
5418 n++;
5419 }
5420 ip = (ip << 8) + u;
5421 n++;
5422
5423 if (ip)
5424 {
5425 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5426 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5427 config->nbmultiaddress++;
5428 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5429 }
5430
5431 sip = n;
5432 }
5433
5434 if (config->nbmultiaddress >= 1)
5435 {
5436 config->bind_address = config->bind_n_address[0];
5437 config->iftun_address = config->bind_address;
5438 }
5439 }
5440
5441 if(!config->iftun_address)
5442 {
5443 config->iftun_address = config->bind_address;
5444 config->iftun_n_address[0] = config->iftun_address;
5445 }
5446
5447 if (!*config->pppoe_ac_name)
5448 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5449
5450 // re-initialise the random number source
5451 initrandom(config->random_device);
5452
5453 // Update plugins
5454 for (i = 0; i < MAXPLUGINS; i++)
5455 {
5456 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5457 continue;
5458
5459 if (*config->plugins[i])
5460 {
5461 // Plugin added
5462 add_plugin(config->plugins[i]);
5463 }
5464 else if (*config->old_plugins[i])
5465 {
5466 // Plugin removed
5467 remove_plugin(config->old_plugins[i]);
5468 }
5469 }
5470
5471 // Guest change
5472 guest_accounts_num = 0;
5473 char *p2 = config->guest_user;
5474 while (p2 && *p2)
5475 {
5476 char *s = strpbrk(p2, " \t,");
5477 if (s)
5478 {
5479 *s++ = 0;
5480 while (*s == ' ' || *s == '\t')
5481 s++;
5482
5483 if (!*s)
5484 s = 0;
5485 }
5486
5487 strcpy(guest_users[guest_accounts_num], p2);
5488 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5489 guest_accounts_num++;
5490 p2 = s;
5491 }
5492 // Rebuild the guest_user array
5493 strcpy(config->guest_user, "");
5494 int ui = 0;
5495 for (ui=0; ui<guest_accounts_num; ui++)
5496 {
5497 strcat(config->guest_user, guest_users[ui]);
5498 if (ui<guest_accounts_num-1)
5499 {
5500 strcat(config->guest_user, ",");
5501 }
5502 }
5503
5504
5505 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5506 if (!config->multi_read_count) config->multi_read_count = 10;
5507 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5508 if (!*config->cluster_interface)
5509 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5510
5511 if (!config->cluster_hb_interval)
5512 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5513
5514 if (!config->cluster_hb_timeout)
5515 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5516
5517 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5518 {
5519 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5520 // late, ensure we're sufficiently larger than that
5521 int t = 4 * config->cluster_hb_interval + 11;
5522
5523 if (config->cluster_hb_timeout < t)
5524 {
5525 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5526 config->cluster_hb_timeout = t;
5527 }
5528
5529 // Push timing changes to the slaves immediately if we're the master
5530 if (config->cluster_iam_master)
5531 cluster_heartbeat();
5532
5533 interval = config->cluster_hb_interval;
5534 timeout = config->cluster_hb_timeout;
5535 }
5536
5537 // Write PID file
5538 if (*config->pid_file == '/' && !config->wrote_pid)
5539 {
5540 FILE *f;
5541 if ((f = fopen(config->pid_file, "w")))
5542 {
5543 fprintf(f, "%d\n", getpid());
5544 fclose(f);
5545 config->wrote_pid = 1;
5546 }
5547 else
5548 {
5549 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5550 }
5551 }
5552 }
5553
5554 static void read_config_file()
5555 {
5556 FILE *f;
5557
5558 if (!config->config_file) return;
5559 if (!(f = fopen(config->config_file, "r")))
5560 {
5561 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5562 return;
5563 }
5564
5565 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5566 cli_do_file(f);
5567 LOG(3, 0, 0, "Done reading config file\n");
5568 fclose(f);
5569 }
5570
5571 int sessionsetup(sessionidt s, tunnelidt t)
5572 {
5573 // A session now exists, set it up
5574 in_addr_t ip;
5575 char *user;
5576 sessionidt i;
5577 int r;
5578
5579 CSTAT(sessionsetup);
5580
5581 LOG(3, s, t, "Doing session setup for session\n");
5582
5583 // Join a bundle if the MRRU option is accepted
5584 if(session[s].mrru > 0 && session[s].bundle == 0)
5585 {
5586 LOG(3, s, t, "This session can be part of multilink bundle\n");
5587 if (join_bundle(s) > 0)
5588 cluster_send_bundle(session[s].bundle);
5589 else
5590 {
5591 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5592 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5593 return 0;
5594 }
5595 }
5596
5597 if (!session[s].ip)
5598 {
5599 assign_ip_address(s);
5600 if (!session[s].ip)
5601 {
5602 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5603 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5604 return 0;
5605 }
5606 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5607 fmtaddr(htonl(session[s].ip), 0));
5608 }
5609
5610 // Make sure this is right
5611 session[s].tunnel = t;
5612
5613 // zap old sessions with same IP and/or username
5614 // Don't kill gardened sessions - doing so leads to a DoS
5615 // from someone who doesn't need to know the password
5616 {
5617 ip = session[s].ip;
5618 user = session[s].user;
5619 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5620 {
5621 if (i == s) continue;
5622 if (!session[s].opened) break;
5623 // Allow duplicate sessions for multilink ones of the same bundle.
5624 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5625
5626 if (ip == session[i].ip)
5627 {
5628 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5629 continue;
5630 }
5631
5632 if (config->allow_duplicate_users) continue;
5633 if (session[s].walled_garden || session[i].walled_garden) continue;
5634 // Guest change
5635 int found = 0;
5636 int gu;
5637 for (gu = 0; gu < guest_accounts_num; gu++)
5638 {
5639 if (!strcasecmp(user, guest_users[gu]))
5640 {
5641 found = 1;
5642 break;
5643 }
5644 }
5645 if (found) continue;
5646
5647 // Drop the new session in case of duplicate sessionss, not the old one.
5648 if (!strcasecmp(user, session[i].user))
5649 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5650 }
5651 }
5652
5653 // no need to set a route for the same IP address of the bundle
5654 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5655 {
5656 int routed = 0;
5657
5658 // Add the route for this session.
5659 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5660 {
5661 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5662 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5663 routed++;
5664
5665 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5666 }
5667
5668 // Static IPs need to be routed if not already
5669 // convered by a Framed-Route. Anything else is part
5670 // of the IP address pool and is already routed, it
5671 // just needs to be added to the IP cache.
5672 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5673 if (session[s].ip_pool_index == -1) // static ip
5674 {
5675 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5676 }
5677 else
5678 cache_ipmap(session[s].ip, s);
5679 }
5680
5681 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5682 lcp_open(s, t); // transition to Network phase and send initial IPCP
5683
5684 // Run the plugin's against this new session.
5685 {
5686 struct param_new_session data = { &tunnel[t], &session[s] };
5687 run_plugins(PLUGIN_NEW_SESSION, &data);
5688 }
5689
5690 // Allocate TBFs if throttled
5691 if (session[s].throttle_in || session[s].throttle_out)
5692 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5693
5694 session[s].last_packet = session[s].last_data = time_now;
5695
5696 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5697 fmtaddr(htonl(session[s].ip), 0),
5698 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5699
5700 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5701
5702 return 1; // RADIUS OK and IP allocated, done...
5703 }
5704
5705 //
5706 // This session just got dropped on us by the master or something.
5707 // Make sure our tables up up to date...
5708 //
5709 int load_session(sessionidt s, sessiont *new)
5710 {
5711 int i;
5712 int newip = 0;
5713
5714 // Sanity checks.
5715 if (new->ip_pool_index >= MAXIPPOOL ||
5716 new->tunnel >= MAXTUNNEL)
5717 {
5718 LOG(0, s, 0, "Strange session update received!\n");
5719 // FIXME! What to do here?
5720 return 0;
5721 }
5722
5723 //
5724 // Ok. All sanity checks passed. Now we're committed to
5725 // loading the new session.
5726 //
5727
5728 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5729
5730 // See if routes/ip cache need updating
5731 if (new->ip != session[s].ip)
5732 newip++;
5733
5734 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5735 if (new->route[i].ip != session[s].route[i].ip ||
5736 new->route[i].prefixlen != session[s].route[i].prefixlen)
5737 newip++;
5738
5739 // needs update
5740 if (newip)
5741 {
5742 int routed = 0;
5743
5744 // remove old routes...
5745 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5746 {
5747 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5748 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5749 routed++;
5750
5751 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5752 }
5753
5754 // ...ip
5755 if (session[s].ip)
5756 {
5757 if (session[s].ip_pool_index == -1) // static IP
5758 {
5759 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5760 }
5761 else // It's part of the IP pool, remove it manually.
5762 uncache_ipmap(session[s].ip);
5763 }
5764
5765 routed = 0;
5766
5767 // add new routes...
5768 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5769 {
5770 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5771 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5772 routed++;
5773
5774 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5775 }
5776
5777 // ...ip
5778 if (new->ip)
5779 {
5780 // If there's a new one, add it.
5781 if (new->ip_pool_index == -1)
5782 {
5783 if (!routed) routeset(s, new->ip, 0, 0, 1);
5784 }
5785 else
5786 cache_ipmap(new->ip, s);
5787 }
5788 }
5789
5790 // check v6 routing
5791 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5792 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5793
5794 // check filters
5795 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5796 {
5797 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5798 new->filter_in = 0;
5799 }
5800
5801 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5802 {
5803 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5804 new->filter_out = 0;
5805 }
5806
5807 if (new->filter_in != session[s].filter_in)
5808 {
5809 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5810 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5811 }
5812
5813 if (new->filter_out != session[s].filter_out)
5814 {
5815 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5816 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5817 }
5818
5819 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5820 // for walking the sessions to forward byte counts to the master.
5821 config->cluster_highest_sessionid = s;
5822
5823 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5824
5825 // Do fixups into address pool.
5826 if (new->ip_pool_index != -1)
5827 fix_address_pool(s);
5828
5829 return 1;
5830 }
5831
5832 static void initplugins()
5833 {
5834 int i;
5835
5836 loaded_plugins = ll_init();
5837 // Initialize the plugins to nothing
5838 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5839 plugins[i] = ll_init();
5840 }
5841
5842 static void *open_plugin(char *plugin_name, int load)
5843 {
5844 char path[256] = "";
5845
5846 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5847 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5848 return dlopen(path, RTLD_NOW);
5849 }
5850
5851 // plugin callback to get a config value
5852 static void *getconfig(char *key, enum config_typet type)
5853 {
5854 int i;
5855
5856 for (i = 0; config_values[i].key; i++)
5857 {
5858 if (!strcmp(config_values[i].key, key))
5859 {
5860 if (config_values[i].type == type)
5861 return ((void *) config) + config_values[i].offset;
5862
5863 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5864 key, type, config_values[i].type);
5865
5866 return 0;
5867 }
5868 }
5869
5870 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5871 return 0;
5872 }
5873
5874 static int add_plugin(char *plugin_name)
5875 {
5876 static struct pluginfuncs funcs = {
5877 _log,
5878 _log_hex,
5879 fmtaddr,
5880 sessionbyuser,
5881 sessiontbysessionidt,
5882 sessionidtbysessiont,
5883 radiusnew,
5884 radiussend,
5885 getconfig,
5886 sessionshutdown,
5887 sessionkill,
5888 throttle_session,
5889 cluster_send_session,
5890 };
5891
5892 void *p = open_plugin(plugin_name, 1);
5893 int (*initfunc)(struct pluginfuncs *);
5894 int i;
5895
5896 if (!p)
5897 {
5898 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5899 return -1;
5900 }
5901
5902 if (ll_contains(loaded_plugins, p))
5903 {
5904 dlclose(p);
5905 return 0; // already loaded
5906 }
5907
5908 {
5909 int *v = dlsym(p, "plugin_api_version");
5910 if (!v || *v != PLUGIN_API_VERSION)
5911 {
5912 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5913 dlclose(p);
5914 return -1;
5915 }
5916 }
5917
5918 if ((initfunc = dlsym(p, "plugin_init")))
5919 {
5920 if (!initfunc(&funcs))
5921 {
5922 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5923 dlclose(p);
5924 return -1;
5925 }
5926 }
5927
5928 ll_push(loaded_plugins, p);
5929
5930 for (i = 0; i < max_plugin_functions; i++)
5931 {
5932 void *x;
5933 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5934 {
5935 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5936 ll_push(plugins[i], x);
5937 }
5938 }
5939
5940 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5941 return 1;
5942 }
5943
5944 static void run_plugin_done(void *plugin)
5945 {
5946 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5947
5948 if (donefunc)
5949 donefunc();
5950 }
5951
5952 static int remove_plugin(char *plugin_name)
5953 {
5954 void *p = open_plugin(plugin_name, 0);
5955 int loaded = 0;
5956
5957 if (!p)
5958 return -1;
5959
5960 if (ll_contains(loaded_plugins, p))
5961 {
5962 int i;
5963 for (i = 0; i < max_plugin_functions; i++)
5964 {
5965 void *x;
5966 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5967 ll_delete(plugins[i], x);
5968 }
5969
5970 ll_delete(loaded_plugins, p);
5971 run_plugin_done(p);
5972 loaded = 1;
5973 }
5974
5975 dlclose(p);
5976 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5977 return loaded;
5978 }
5979
5980 int run_plugins(int plugin_type, void *data)
5981 {
5982 int (*func)(void *data);
5983
5984 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5985 return PLUGIN_RET_ERROR;
5986
5987 ll_reset(plugins[plugin_type]);
5988 while ((func = ll_next(plugins[plugin_type])))
5989 {
5990 int r = func(data);
5991
5992 if (r != PLUGIN_RET_OK)
5993 return r; // stop here
5994 }
5995
5996 return PLUGIN_RET_OK;
5997 }
5998
5999 static void plugins_done()
6000 {
6001 void *p;
6002
6003 ll_reset(loaded_plugins);
6004 while ((p = ll_next(loaded_plugins)))
6005 run_plugin_done(p);
6006 }
6007
6008 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6009 {
6010 struct nsctl request;
6011 struct nsctl response;
6012 int type = unpack_control(&request, buf, len);
6013 int r;
6014 void *p;
6015
6016 if (log_stream && config->debug >= 4)
6017 {
6018 if (type < 0)
6019 {
6020 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6021 fmtaddr(addr->sin_addr.s_addr, 0), type);
6022 }
6023 else
6024 {
6025 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6026 dump_control(&request, log_stream);
6027 }
6028 }
6029
6030 switch (type)
6031 {
6032 case NSCTL_REQ_LOAD:
6033 if (request.argc != 1)
6034 {
6035 response.type = NSCTL_RES_ERR;
6036 response.argc = 1;
6037 response.argv[0] = "name of plugin required";
6038 }
6039 else if ((r = add_plugin(request.argv[0])) < 1)
6040 {
6041 response.type = NSCTL_RES_ERR;
6042 response.argc = 1;
6043 response.argv[0] = !r
6044 ? "plugin already loaded"
6045 : "error loading plugin";
6046 }
6047 else
6048 {
6049 response.type = NSCTL_RES_OK;
6050 response.argc = 0;
6051 }
6052
6053 break;
6054
6055 case NSCTL_REQ_UNLOAD:
6056 if (request.argc != 1)
6057 {
6058 response.type = NSCTL_RES_ERR;
6059 response.argc = 1;
6060 response.argv[0] = "name of plugin required";
6061 }
6062 else if ((r = remove_plugin(request.argv[0])) < 1)
6063 {
6064 response.type = NSCTL_RES_ERR;
6065 response.argc = 1;
6066 response.argv[0] = !r
6067 ? "plugin not loaded"
6068 : "plugin not found";
6069 }
6070 else
6071 {
6072 response.type = NSCTL_RES_OK;
6073 response.argc = 0;
6074 }
6075
6076 break;
6077
6078 case NSCTL_REQ_HELP:
6079 response.type = NSCTL_RES_OK;
6080 response.argc = 0;
6081
6082 ll_reset(loaded_plugins);
6083 while ((p = ll_next(loaded_plugins)))
6084 {
6085 char **help = dlsym(p, "plugin_control_help");
6086 while (response.argc < 0xff && help && *help)
6087 response.argv[response.argc++] = *help++;
6088 }
6089
6090 break;
6091
6092 case NSCTL_REQ_CONTROL:
6093 {
6094 struct param_control param = {
6095 config->cluster_iam_master,
6096 request.argc,
6097 request.argv,
6098 0,
6099 NULL,
6100 };
6101
6102 int r = run_plugins(PLUGIN_CONTROL, &param);
6103
6104 if (r == PLUGIN_RET_ERROR)
6105 {
6106 response.type = NSCTL_RES_ERR;
6107 response.argc = 1;
6108 response.argv[0] = param.additional
6109 ? param.additional
6110 : "error returned by plugin";
6111 }
6112 else if (r == PLUGIN_RET_NOTMASTER)
6113 {
6114 static char msg[] = "must be run on master: 000.000.000.000";
6115
6116 response.type = NSCTL_RES_ERR;
6117 response.argc = 1;
6118 if (config->cluster_master_address)
6119 {
6120 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6121 response.argv[0] = msg;
6122 }
6123 else
6124 {
6125 response.argv[0] = "must be run on master: none elected";
6126 }
6127 }
6128 else if (!(param.response & NSCTL_RESPONSE))
6129 {
6130 response.type = NSCTL_RES_ERR;
6131 response.argc = 1;
6132 response.argv[0] = param.response
6133 ? "unrecognised response value from plugin"
6134 : "unhandled action";
6135 }
6136 else
6137 {
6138 response.type = param.response;
6139 response.argc = 0;
6140 if (param.additional)
6141 {
6142 response.argc = 1;
6143 response.argv[0] = param.additional;
6144 }
6145 }
6146 }
6147
6148 break;
6149
6150 default:
6151 response.type = NSCTL_RES_ERR;
6152 response.argc = 1;
6153 response.argv[0] = "error unpacking control packet";
6154 }
6155
6156 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6157 if (!buf)
6158 {
6159 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6160 return;
6161 }
6162
6163 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6164 if (r > 0)
6165 {
6166 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6167 if (log_stream && config->debug >= 4)
6168 {
6169 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6170 dump_control(&response, log_stream);
6171 }
6172 }
6173 else
6174 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6175 fmtaddr(addr->sin_addr.s_addr, 0), r);
6176
6177 free(buf);
6178 }
6179
6180 static tunnelidt new_tunnel()
6181 {
6182 tunnelidt i;
6183 for (i = 1; i < MAXTUNNEL; i++)
6184 {
6185 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6186 {
6187 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6188 if (i > config->cluster_highest_tunnelid)
6189 config->cluster_highest_tunnelid = i;
6190 return i;
6191 }
6192 }
6193 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6194 return 0;
6195 }
6196
6197 //
6198 // We're becoming the master. Do any required setup..
6199 //
6200 // This is principally telling all the plugins that we're
6201 // now a master, and telling them about all the sessions
6202 // that are active too..
6203 //
6204 void become_master(void)
6205 {
6206 int s, i;
6207 static struct event_data d[RADIUS_FDS];
6208 struct epoll_event e;
6209
6210 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6211
6212 // running a bunch of iptables commands is slow and can cause
6213 // the master to drop tunnels on takeover--kludge around the
6214 // problem by forking for the moment (note: race)
6215 if (!fork_and_close())
6216 {
6217 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6218 {
6219 if (!session[s].opened) // Not an in-use session.
6220 continue;
6221
6222 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6223 }
6224 exit(0);
6225 }
6226
6227 // add radius fds
6228 e.events = EPOLLIN;
6229 for (i = 0; i < RADIUS_FDS; i++)
6230 {
6231 d[i].type = FD_TYPE_RADIUS;
6232 d[i].index = i;
6233 e.data.ptr = &d[i];
6234
6235 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6236 }
6237 }
6238
6239 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6240 {
6241 int s, i;
6242 int count = 0;
6243 int buckets[64];
6244
6245 if (CLI_HELP_REQUESTED)
6246 return CLI_HELP_NO_ARGS;
6247
6248 time(&time_now);
6249 for (i = 0; i < 64;++i) buckets[i] = 0;
6250
6251 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6252 {
6253 int idle;
6254 if (!session[s].opened)
6255 continue;
6256
6257 idle = time_now - session[s].last_data;
6258 idle /= 5 ; // In multiples of 5 seconds.
6259 if (idle < 0)
6260 idle = 0;
6261 if (idle > 63)
6262 idle = 63;
6263
6264 ++count;
6265 ++buckets[idle];
6266 }
6267
6268 for (i = 0; i < 63; ++i)
6269 {
6270 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6271 }
6272 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6273 cli_print(cli, "%d total sessions open.", count);
6274 return CLI_OK;
6275 }
6276
6277 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6278 {
6279 int s, i;
6280 int count = 0;
6281 int buckets[64];
6282
6283 if (CLI_HELP_REQUESTED)
6284 return CLI_HELP_NO_ARGS;
6285
6286 time(&time_now);
6287 for (i = 0; i < 64;++i) buckets[i] = 0;
6288
6289 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6290 {
6291 int open = 0, d;
6292 if (!session[s].opened)
6293 continue;
6294
6295 d = time_now - session[s].opened;
6296 if (d < 0)
6297 d = 0;
6298 while (d > 1 && open < 32)
6299 {
6300 ++open;
6301 d >>= 1; // half.
6302 }
6303 ++count;
6304 ++buckets[open];
6305 }
6306
6307 s = 1;
6308 for (i = 0; i < 30; ++i)
6309 {
6310 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6311 s <<= 1;
6312 }
6313 cli_print(cli, "%d total sessions open.", count);
6314 return CLI_OK;
6315 }
6316
6317 /* Unhide an avp.
6318 *
6319 * This unencodes the AVP using the L2TP secret and the previously
6320 * stored random vector. It overwrites the hidden data with the
6321 * unhidden AVP subformat.
6322 */
6323 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6324 {
6325 MD5_CTX ctx;
6326 uint8_t digest[16];
6327 uint8_t *last;
6328 size_t d = 0;
6329 uint16_t m = htons(type);
6330
6331 // Compute initial pad
6332 MD5_Init(&ctx);
6333 MD5_Update(&ctx, (unsigned char *) &m, 2);
6334 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6335 MD5_Update(&ctx, vector, vec_len);
6336 MD5_Final(digest, &ctx);
6337
6338 // pointer to last decoded 16 octets
6339 last = value;
6340
6341 while (len > 0)
6342 {
6343 // calculate a new pad based on the last decoded block
6344 if (d >= sizeof(digest))
6345 {
6346 MD5_Init(&ctx);
6347 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6348 MD5_Update(&ctx, last, sizeof(digest));
6349 MD5_Final(digest, &ctx);
6350
6351 d = 0;
6352 last = value;
6353 }
6354
6355 *value++ ^= digest[d++];
6356 len--;
6357 }
6358 }
6359
6360 int find_filter(char const *name, size_t len)
6361 {
6362 int free = -1;
6363 int i;
6364
6365 for (i = 0; i < MAXFILTER; i++)
6366 {
6367 if (!*ip_filters[i].name)
6368 {
6369 if (free < 0)
6370 free = i;
6371
6372 continue;
6373 }
6374
6375 if (strlen(ip_filters[i].name) != len)
6376 continue;
6377
6378 if (!strncmp(ip_filters[i].name, name, len))
6379 return i;
6380 }
6381
6382 return free;
6383 }
6384
6385 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6386 {
6387 switch (p->op)
6388 {
6389 case FILTER_PORT_OP_EQ: return port == p->port;
6390 case FILTER_PORT_OP_NEQ: return port != p->port;
6391 case FILTER_PORT_OP_GT: return port > p->port;
6392 case FILTER_PORT_OP_LT: return port < p->port;
6393 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6394 }
6395
6396 return 0;
6397 }
6398
6399 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6400 {
6401 switch (op)
6402 {
6403 case FILTER_FLAG_OP_ANY:
6404 return (flags & sflags) || (~flags & cflags);
6405
6406 case FILTER_FLAG_OP_ALL:
6407 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6408
6409 case FILTER_FLAG_OP_EST:
6410 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6411 }
6412
6413 return 0;
6414 }
6415
6416 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6417 {
6418 uint16_t frag_offset;
6419 uint8_t proto;
6420 in_addr_t src_ip;
6421 in_addr_t dst_ip;
6422 uint16_t src_port = 0;
6423 uint16_t dst_port = 0;
6424 uint8_t flags = 0;
6425 ip_filter_rulet *rule;
6426
6427 if (len < 20) // up to end of destination address
6428 return 0;
6429
6430 if ((*buf >> 4) != 4) // IPv4
6431 return 0;
6432
6433 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6434 proto = buf[9];
6435 src_ip = *(in_addr_t *) (buf + 12);
6436 dst_ip = *(in_addr_t *) (buf + 16);
6437
6438 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6439 {
6440 int l = (buf[0] & 0xf) * 4; // length of IP header
6441 if (len < l + 4) // ports
6442 return 0;
6443
6444 src_port = ntohs(*(uint16_t *) (buf + l));
6445 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6446 if (proto == IPPROTO_TCP)
6447 {
6448 if (len < l + 14) // flags
6449 return 0;
6450
6451 flags = buf[l + 13] & 0x3f;
6452 }
6453 }
6454
6455 for (rule = ip_filters[filter].rules; rule->action; rule++)
6456 {
6457 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6458 continue;
6459
6460 if (rule->src_wild != INADDR_BROADCAST &&
6461 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6462 continue;
6463
6464 if (rule->dst_wild != INADDR_BROADCAST &&
6465 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6466 continue;
6467
6468 if (frag_offset)
6469 {
6470 // layer 4 deny rules are skipped
6471 if (rule->action == FILTER_ACTION_DENY &&
6472 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6473 continue;
6474 }
6475 else
6476 {
6477 if (rule->frag)
6478 continue;
6479
6480 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6481 {
6482 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6483 continue;
6484
6485 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6486 continue;
6487
6488 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6489 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6490 continue;
6491 }
6492 }
6493
6494 // matched
6495 rule->counter++;
6496 return rule->action == FILTER_ACTION_PERMIT;
6497 }
6498
6499 // default deny
6500 return 0;
6501 }
6502
6503 tunnelidt lac_new_tunnel()
6504 {
6505 return new_tunnel();
6506 }
6507
6508 void lac_tunnelclear(tunnelidt t)
6509 {
6510 tunnelclear(t);
6511 }
6512
6513 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6514 {
6515 uint16_t version = 0x0100; // protocol version
6516
6517 tunnel[t].state = TUNNELOPENING;
6518
6519 // Sent SCCRQ - Start Control Connection Request
6520 controlt *c = controlnew(1); // sending SCCRQ
6521 controls(c, 7, hostname, 1); // host name
6522 controls(c, 8, Vendor_name, 1); // Vendor name
6523 control16(c, 2, version, 1); // protocol version
6524 control32(c, 3, 3, 1); // framing Capabilities
6525 control16(c, 9, t, 1); // assigned tunnel
6526 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6527 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6528 controladd(c, 0, t); // send
6529 }
6530
6531 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6532 {
6533 // Sent ICRQ Incoming-call-request
6534 controlt *c = controlnew(10); // ICRQ
6535
6536 control16(c, 14, s, 1); // assigned sesion
6537 call_serial_number++;
6538 control32(c, 15, call_serial_number, 1); // call serial number
6539 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6540 controladd(c, 0, t); // send
6541 }
6542
6543 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6544 {
6545 tunnelshutdown(t, reason, result, error, msg);
6546 }
6547