68817a223b150cb6b54778d1c5002141549adab4
[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 CONFIG("multi_hostname", multi_hostname, STRING),
191 { NULL, 0, 0, 0 }
192 };
193
194 static char *plugin_functions[] = {
195 NULL,
196 "plugin_pre_auth",
197 "plugin_post_auth",
198 "plugin_timer",
199 "plugin_new_session",
200 "plugin_kill_session",
201 "plugin_control",
202 "plugin_radius_response",
203 "plugin_radius_reset",
204 "plugin_radius_account",
205 "plugin_become_master",
206 "plugin_new_session_master",
207 };
208
209 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
210
211 // Counters for shutdown sessions
212 static sessiont shut_acct[8192];
213 static sessionidt shut_acct_n = 0;
214
215 tunnelt *tunnel = NULL; // Array of tunnel structures.
216 bundlet *bundle = NULL; // Array of bundle structures.
217 fragmentationt *frag = NULL; // Array of fragmentation structures.
218 sessiont *session = NULL; // Array of session structures.
219 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
220 radiust *radius = NULL; // Array of radius structures.
221 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
222 ip_filtert *ip_filters = NULL; // Array of named filters.
223 static controlt *controlfree = 0;
224 struct Tstats *_statistics = NULL;
225 #ifdef RINGBUFFER
226 struct Tringbuffer *ringbuffer = NULL;
227 #endif
228
229 static ssize_t netlink_send(struct nlmsghdr *nh);
230 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
231 static void cache_ipmap(in_addr_t ip, sessionidt s);
232 static void uncache_ipmap(in_addr_t ip);
233 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
234 static void free_ip_address(sessionidt s);
235 static void dump_acct_info(int all);
236 static void sighup_handler(int sig);
237 static void shutdown_handler(int sig);
238 static void sigchild_handler(int sig);
239 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
240 static void update_config(void);
241 static void read_config_file(void);
242 static void initplugins(void);
243 static int add_plugin(char *plugin_name);
244 static int remove_plugin(char *plugin_name);
245 static void plugins_done(void);
246 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
247 static tunnelidt new_tunnel(void);
248 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
249 static void bundleclear(bundleidt b);
250
251 // return internal time (10ths since process startup), set f if given
252 // as a side-effect sets time_now, and time_changed
253 static clockt now(double *f)
254 {
255 struct timeval t;
256 gettimeofday(&t, 0);
257 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
258 if (t.tv_sec != time_now)
259 {
260 time_now = t.tv_sec;
261 time_changed++;
262 }
263
264 // Time in milliseconds
265 // TODO FOR MLPPP DEV
266 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
267
268 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
269 }
270
271 // work out a retry time based on try number
272 // This is a straight bounded exponential backoff.
273 // Maximum re-try time is 32 seconds. (2^5).
274 clockt backoff(uint8_t try)
275 {
276 if (try > 5) try = 5; // max backoff
277 return now(NULL) + 10 * (1 << try);
278 }
279
280
281 //
282 // Log a debug message. Typically called via the LOG macro
283 //
284 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
285 {
286 static char message[65536] = {0};
287 va_list ap;
288
289 #ifdef RINGBUFFER
290 if (ringbuffer)
291 {
292 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
293 ringbuffer->tail = 0;
294 if (ringbuffer->tail == ringbuffer->head)
295 if (++ringbuffer->head >= RINGBUFFER_SIZE)
296 ringbuffer->head = 0;
297
298 ringbuffer->buffer[ringbuffer->tail].level = level;
299 ringbuffer->buffer[ringbuffer->tail].session = s;
300 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
301 va_start(ap, format);
302 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
303 va_end(ap);
304 }
305 #endif
306
307 if (config->debug < level) return;
308
309 va_start(ap, format);
310 vsnprintf(message, sizeof(message), format, ap);
311
312 if (log_stream)
313 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
314 else if (syslog_log)
315 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
316
317 va_end(ap);
318 }
319
320 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
321 {
322 int i, j;
323 const uint8_t *d = data;
324
325 if (config->debug < level) return;
326
327 // No support for _log_hex to syslog
328 if (log_stream)
329 {
330 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
331 setvbuf(log_stream, NULL, _IOFBF, 16384);
332
333 for (i = 0; i < maxsize; )
334 {
335 fprintf(log_stream, "%4X: ", i);
336 for (j = i; j < maxsize && j < (i + 16); j++)
337 {
338 fprintf(log_stream, "%02X ", d[j]);
339 if (j == i + 7)
340 fputs(": ", log_stream);
341 }
342
343 for (; j < i + 16; j++)
344 {
345 fputs(" ", log_stream);
346 if (j == i + 7)
347 fputs(": ", log_stream);
348 }
349
350 fputs(" ", log_stream);
351 for (j = i; j < maxsize && j < (i + 16); j++)
352 {
353 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
354 fputc(d[j], log_stream);
355 else
356 fputc('.', log_stream);
357
358 if (j == i + 7)
359 fputs(" ", log_stream);
360 }
361
362 i = j;
363 fputs("\n", log_stream);
364 }
365
366 fflush(log_stream);
367 setbuf(log_stream, NULL);
368 }
369 }
370
371 // update a counter, accumulating 2^32 wraps
372 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
373 {
374 uint32_t new = *counter + delta;
375 if (new < *counter)
376 (*wrap)++;
377
378 *counter = new;
379 }
380
381 // initialise the random generator
382 static void initrandom(char *source)
383 {
384 static char path[sizeof(config->random_device)] = "*undefined*";
385
386 // reinitialise only if we are forced to do so or if the config has changed
387 if (source && !strncmp(path, source, sizeof(path)))
388 return;
389
390 // close previous source, if any
391 if (rand_fd >= 0)
392 close(rand_fd);
393
394 rand_fd = -1;
395
396 if (source)
397 {
398 // register changes
399 snprintf(path, sizeof(path), "%s", source);
400
401 if (*path == '/')
402 {
403 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
404 if (rand_fd < 0)
405 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
406 path, strerror(errno));
407 }
408 }
409 }
410
411 // fill buffer with random data
412 void random_data(uint8_t *buf, int len)
413 {
414 int n = 0;
415
416 CSTAT(random_data);
417 if (rand_fd >= 0)
418 {
419 n = read(rand_fd, buf, len);
420 if (n >= len) return;
421 if (n < 0)
422 {
423 if (errno != EAGAIN)
424 {
425 LOG(0, 0, 0, "Error reading from random source: %s\n",
426 strerror(errno));
427
428 // fall back to rand()
429 initrandom(NULL);
430 }
431
432 n = 0;
433 }
434 }
435
436 // append missing data
437 while (n < len)
438 // not using the low order bits from the prng stream
439 buf[n++] = (rand() >> 4) & 0xff;
440 }
441
442 // Add a route
443 //
444 // This adds it to the routing table, advertises it
445 // via BGP if enabled, and stuffs it into the
446 // 'sessionbyip' cache.
447 //
448 // 'ip' must be in _host_ order.
449 //
450 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
451 {
452 struct {
453 struct nlmsghdr nh;
454 struct rtmsg rt;
455 char buf[32];
456 } req;
457 int i;
458 in_addr_t n_ip;
459
460 if (!prefixlen) prefixlen = 32;
461
462 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
463
464 memset(&req, 0, sizeof(req));
465
466 if (add)
467 {
468 req.nh.nlmsg_type = RTM_NEWROUTE;
469 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
470 }
471 else
472 {
473 req.nh.nlmsg_type = RTM_DELROUTE;
474 req.nh.nlmsg_flags = NLM_F_REQUEST;
475 }
476
477 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
478
479 req.rt.rtm_family = AF_INET;
480 req.rt.rtm_dst_len = prefixlen;
481 req.rt.rtm_table = RT_TABLE_MAIN;
482 req.rt.rtm_protocol = 42;
483 req.rt.rtm_scope = RT_SCOPE_LINK;
484 req.rt.rtm_type = RTN_UNICAST;
485
486 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
487 n_ip = htonl(ip);
488 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
489 if (gw)
490 {
491 n_ip = htonl(gw);
492 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
493 }
494
495 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
496 fmtaddr(htonl(ip), 0), prefixlen,
497 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
498
499 if (netlink_send(&req.nh) < 0)
500 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
501
502 #ifdef BGP
503 if (add)
504 bgp_add_route(htonl(ip), prefixlen);
505 else
506 bgp_del_route(htonl(ip), prefixlen);
507 #endif /* BGP */
508
509 // Add/Remove the IPs to the 'sessionbyip' cache.
510 // Note that we add the zero address in the case of
511 // a network route. Roll on CIDR.
512
513 // Note that 's == 0' implies this is the address pool.
514 // We still cache it here, because it will pre-fill
515 // the malloc'ed tree.
516
517 if (s)
518 {
519 if (!add) // Are we deleting a route?
520 s = 0; // Caching the session as '0' is the same as uncaching.
521
522 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
523 cache_ipmap(i, s);
524 }
525 }
526
527 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
528 {
529 struct {
530 struct nlmsghdr nh;
531 struct rtmsg rt;
532 char buf[64];
533 } req;
534 int metric;
535 char ipv6addr[INET6_ADDRSTRLEN];
536
537 if (!config->ipv6_prefix.s6_addr[0])
538 {
539 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
540 return;
541 }
542
543 memset(&req, 0, sizeof(req));
544
545 if (add)
546 {
547 req.nh.nlmsg_type = RTM_NEWROUTE;
548 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
549 }
550 else
551 {
552 req.nh.nlmsg_type = RTM_DELROUTE;
553 req.nh.nlmsg_flags = NLM_F_REQUEST;
554 }
555
556 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
557
558 req.rt.rtm_family = AF_INET6;
559 req.rt.rtm_dst_len = prefixlen;
560 req.rt.rtm_table = RT_TABLE_MAIN;
561 req.rt.rtm_protocol = 42;
562 req.rt.rtm_scope = RT_SCOPE_LINK;
563 req.rt.rtm_type = RTN_UNICAST;
564
565 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
566 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
567 metric = 1;
568 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
569
570 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
571 add ? "add" : "del",
572 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
573 prefixlen);
574
575 if (netlink_send(&req.nh) < 0)
576 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
577
578 #ifdef BGP
579 if (add)
580 bgp_add_route6(ip, prefixlen);
581 else
582 bgp_del_route6(ip, prefixlen);
583 #endif /* BGP */
584
585 if (s)
586 {
587 if (!add) // Are we deleting a route?
588 s = 0; // Caching the session as '0' is the same as uncaching.
589
590 cache_ipv6map(ip, prefixlen, s);
591 }
592
593 return;
594 }
595
596 //
597 // Set up netlink socket
598 static void initnetlink(void)
599 {
600 struct sockaddr_nl nladdr;
601
602 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
603 if (nlfd < 0)
604 {
605 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
606 exit(1);
607 }
608
609 memset(&nladdr, 0, sizeof(nladdr));
610 nladdr.nl_family = AF_NETLINK;
611 nladdr.nl_pid = getpid();
612
613 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
614 {
615 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
616 exit(1);
617 }
618 }
619
620 static ssize_t netlink_send(struct nlmsghdr *nh)
621 {
622 struct sockaddr_nl nladdr;
623 struct iovec iov;
624 struct msghdr msg;
625
626 nh->nlmsg_pid = getpid();
627 nh->nlmsg_seq = ++nlseqnum;
628
629 // set kernel address
630 memset(&nladdr, 0, sizeof(nladdr));
631 nladdr.nl_family = AF_NETLINK;
632
633 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
634 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
635
636 return sendmsg(nlfd, &msg, 0);
637 }
638
639 static ssize_t netlink_recv(void *buf, ssize_t len)
640 {
641 struct sockaddr_nl nladdr;
642 struct iovec iov;
643 struct msghdr msg;
644
645 // set kernel address
646 memset(&nladdr, 0, sizeof(nladdr));
647 nladdr.nl_family = AF_NETLINK;
648
649 iov = (struct iovec){ buf, len };
650 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
651
652 return recvmsg(nlfd, &msg, 0);
653 }
654
655 /* adapted from iproute2 */
656 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
657 {
658 int len = RTA_LENGTH(alen);
659 struct rtattr *rta;
660
661 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
662 rta->rta_type = type;
663 rta->rta_len = len;
664 memcpy(RTA_DATA(rta), data, alen);
665 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
666 }
667
668 // messages corresponding to different phases seq number
669 static char *tun_nl_phase_msg[] = {
670 "initialized",
671 "getting tun interface index",
672 "setting tun interface parameters",
673 "setting tun IPv4 address",
674 "setting tun LL IPv6 address",
675 "setting tun global IPv6 address",
676 };
677
678 //
679 // Set up TUN interface
680 static void inittun(void)
681 {
682 struct ifreq ifr;
683
684 memset(&ifr, 0, sizeof(ifr));
685 ifr.ifr_flags = IFF_TUN;
686
687 tunfd = open(TUNDEVICE, O_RDWR);
688 if (tunfd < 0)
689 { // fatal
690 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
691 exit(1);
692 }
693 {
694 int flags = fcntl(tunfd, F_GETFL, 0);
695 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
696 }
697
698 if (*config->tundevicename)
699 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
700
701 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
702 {
703 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
704 exit(1);
705 }
706 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
707 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
708
709 tunidx = if_nametoindex(config->tundevicename);
710 if (tunidx == 0)
711 {
712 LOG(0, 0, 0, "Can't get tun interface index\n");
713 exit(1);
714 }
715
716 {
717 struct {
718 // interface setting
719 struct nlmsghdr nh;
720 union {
721 struct ifinfomsg ifinfo;
722 struct ifaddrmsg ifaddr;
723 } ifmsg;
724 char rtdata[32]; // 32 should be enough
725 } req;
726 uint32_t txqlen, mtu;
727 in_addr_t ip;
728
729 memset(&req, 0, sizeof(req));
730
731 req.nh.nlmsg_type = RTM_NEWLINK;
732 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
733 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
734
735 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
736 req.ifmsg.ifinfo.ifi_index = tunidx;
737 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
738 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
739
740 /* Bump up the qlen to deal with bursts from the network */
741 txqlen = 1000;
742 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
743 /* set MTU to modem MRU */
744 mtu = MRU;
745 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
746
747 if (netlink_send(&req.nh) < 0)
748 goto senderror;
749
750 memset(&req, 0, sizeof(req));
751
752 req.nh.nlmsg_type = RTM_NEWADDR;
753 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
754 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
755
756 req.ifmsg.ifaddr.ifa_family = AF_INET;
757 req.ifmsg.ifaddr.ifa_prefixlen = 32;
758 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
759 req.ifmsg.ifaddr.ifa_index = tunidx;
760
761 if (config->nbmultiaddress > 1)
762 {
763 int i;
764 for (i = 0; i < config->nbmultiaddress ; i++)
765 {
766 ip = config->iftun_n_address[i];
767 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
768 if (netlink_send(&req.nh) < 0)
769 goto senderror;
770 }
771 }
772 else
773 {
774 if (config->iftun_address)
775 ip = config->iftun_address;
776 else
777 ip = 0x01010101; // 1.1.1.1
778 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
779
780 if (netlink_send(&req.nh) < 0)
781 goto senderror;
782 }
783
784
785
786 // Only setup IPv6 on the tun device if we have a configured prefix
787 if (config->ipv6_prefix.s6_addr[0]) {
788 struct in6_addr ip6;
789
790 memset(&req, 0, sizeof(req));
791
792 req.nh.nlmsg_type = RTM_NEWADDR;
793 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
794 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
795
796 req.ifmsg.ifaddr.ifa_family = AF_INET6;
797 req.ifmsg.ifaddr.ifa_prefixlen = 64;
798 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
799 req.ifmsg.ifaddr.ifa_index = tunidx;
800
801 // Link local address is FE80::1
802 memset(&ip6, 0, sizeof(ip6));
803 ip6.s6_addr[0] = 0xFE;
804 ip6.s6_addr[1] = 0x80;
805 ip6.s6_addr[15] = 1;
806 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
807
808 if (netlink_send(&req.nh) < 0)
809 goto senderror;
810
811 memset(&req, 0, sizeof(req));
812
813 req.nh.nlmsg_type = RTM_NEWADDR;
814 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
815 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
816
817 req.ifmsg.ifaddr.ifa_family = AF_INET6;
818 req.ifmsg.ifaddr.ifa_prefixlen = 64;
819 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
820 req.ifmsg.ifaddr.ifa_index = tunidx;
821
822 // Global address is prefix::1
823 ip6 = config->ipv6_prefix;
824 ip6.s6_addr[15] = 1;
825 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
826
827 if (netlink_send(&req.nh) < 0)
828 goto senderror;
829 }
830
831 memset(&req, 0, sizeof(req));
832
833 req.nh.nlmsg_type = NLMSG_DONE;
834 req.nh.nlmsg_len = NLMSG_LENGTH(0);
835
836 if (netlink_send(&req.nh) < 0)
837 goto senderror;
838
839 // if we get an error for seqnum < min_initok_nlseqnum,
840 // we must exit as initialization went wrong
841 if (config->ipv6_prefix.s6_addr[0])
842 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
843 else
844 min_initok_nlseqnum = 3 + 1; // idx + if + addr
845 }
846
847 return;
848
849 senderror:
850 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
851 exit(1);
852 }
853
854 // set up LAC UDP ports
855 static void initlacudp(void)
856 {
857 int on = 1;
858 struct sockaddr_in addr;
859
860 // Tunnel to Remote LNS
861 memset(&addr, 0, sizeof(addr));
862 addr.sin_family = AF_INET;
863 addr.sin_port = htons(config->bind_portremotelns);
864 addr.sin_addr.s_addr = config->bind_address_remotelns;
865 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
866 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
867 {
868 int flags = fcntl(udplacfd, F_GETFL, 0);
869 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
870 }
871 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
872 {
873 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
874 exit(1);
875 }
876 }
877
878 // set up control ports
879 static void initcontrol(void)
880 {
881 int on = 1;
882 struct sockaddr_in addr;
883
884 // Control
885 memset(&addr, 0, sizeof(addr));
886 addr.sin_family = AF_INET;
887 addr.sin_port = htons(NSCTL_PORT);
888 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
889 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
890 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
891 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
892 {
893 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
894 exit(1);
895 }
896 }
897
898 // set up Dynamic Authorization Extensions to RADIUS port
899 static void initdae(void)
900 {
901 int on = 1;
902 struct sockaddr_in addr;
903
904 // Dynamic Authorization Extensions to RADIUS
905 memset(&addr, 0, sizeof(addr));
906 addr.sin_family = AF_INET;
907 addr.sin_port = htons(config->radius_dae_port);
908 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
909 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
910 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
911 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
912 {
913 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
914 exit(1);
915 }
916 }
917
918 // set up UDP ports
919 static void initudp(int * pudpfd, in_addr_t ip_bind)
920 {
921 int on = 1;
922 struct sockaddr_in addr;
923
924 // Tunnel
925 memset(&addr, 0, sizeof(addr));
926 addr.sin_family = AF_INET;
927 addr.sin_port = htons(L2TPPORT);
928 addr.sin_addr.s_addr = ip_bind;
929 (*pudpfd) = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
930 setsockopt((*pudpfd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
931 {
932 int flags = fcntl((*pudpfd), F_GETFL, 0);
933 fcntl((*pudpfd), F_SETFL, flags | O_NONBLOCK);
934 }
935 if (bind((*pudpfd), (struct sockaddr *) &addr, sizeof(addr)) < 0)
936 {
937 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
938 exit(1);
939 }
940 }
941
942 //
943 // Find session by IP, < 1 for not found
944 //
945 // Confusingly enough, this 'ip' must be
946 // in _network_ order. This being the common
947 // case when looking it up from IP packet headers.
948 //
949 // We actually use this cache for two things.
950 // #1. For used IP addresses, this maps to the
951 // session ID that it's used by.
952 // #2. For un-used IP addresses, this maps to the
953 // index into the pool table that contains that
954 // IP address.
955 //
956
957 static sessionidt lookup_ipmap(in_addr_t ip)
958 {
959 uint8_t *a = (uint8_t *) &ip;
960 union iphash *h = ip_hash;
961
962 if (!(h = h[*a++].idx)) return 0;
963 if (!(h = h[*a++].idx)) return 0;
964 if (!(h = h[*a++].idx)) return 0;
965
966 return h[*a].sess;
967 }
968
969 static sessionidt lookup_ipv6map(struct in6_addr ip)
970 {
971 struct ipv6radix *curnode;
972 int i;
973 int s;
974 char ipv6addr[INET6_ADDRSTRLEN];
975
976 curnode = &ipv6_hash[ip.s6_addr[0]];
977 i = 1;
978 s = curnode->sess;
979
980 while (s == 0 && i < 15 && curnode->branch != NULL)
981 {
982 curnode = &curnode->branch[ip.s6_addr[i]];
983 s = curnode->sess;
984 i++;
985 }
986
987 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
988 inet_ntop(AF_INET6, &ip, ipv6addr,
989 INET6_ADDRSTRLEN),
990 s);
991
992 return s;
993 }
994
995 sessionidt sessionbyip(in_addr_t ip)
996 {
997 sessionidt s = lookup_ipmap(ip);
998 CSTAT(sessionbyip);
999
1000 if (s > 0 && s < MAXSESSION && session[s].opened)
1001 return s;
1002
1003 return 0;
1004 }
1005
1006 sessionidt sessionbyipv6(struct in6_addr ip)
1007 {
1008 sessionidt s;
1009 CSTAT(sessionbyipv6);
1010
1011 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
1012 (ip.s6_addr[0] == 0xFE &&
1013 ip.s6_addr[1] == 0x80 &&
1014 ip.s6_addr16[1] == 0 &&
1015 ip.s6_addr16[2] == 0 &&
1016 ip.s6_addr16[3] == 0)) {
1017 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
1018 } else {
1019 s = lookup_ipv6map(ip);
1020 }
1021
1022 if (s > 0 && s < MAXSESSION && session[s].opened)
1023 return s;
1024
1025 return 0;
1026 }
1027
1028 //
1029 // Take an IP address in HOST byte order and
1030 // add it to the sessionid by IP cache.
1031 //
1032 // (It's actually cached in network order)
1033 //
1034 static void cache_ipmap(in_addr_t ip, sessionidt s)
1035 {
1036 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1037 uint8_t *a = (uint8_t *) &nip;
1038 union iphash *h = ip_hash;
1039 int i;
1040
1041 for (i = 0; i < 3; i++)
1042 {
1043 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1044 return;
1045
1046 h = h[a[i]].idx;
1047 }
1048
1049 h[a[3]].sess = s;
1050
1051 if (s > 0)
1052 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1053
1054 else if (s == 0)
1055 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1056 // else a map to an ip pool index.
1057 }
1058
1059 static void uncache_ipmap(in_addr_t ip)
1060 {
1061 cache_ipmap(ip, 0); // Assign it to the NULL session.
1062 }
1063
1064 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1065 {
1066 int i;
1067 int bytes;
1068 struct ipv6radix *curnode;
1069 char ipv6addr[INET6_ADDRSTRLEN];
1070
1071 curnode = &ipv6_hash[ip.s6_addr[0]];
1072
1073 bytes = prefixlen >> 3;
1074 i = 1;
1075 while (i < bytes) {
1076 if (curnode->branch == NULL)
1077 {
1078 if (!(curnode->branch = calloc(256,
1079 sizeof (struct ipv6radix))))
1080 return;
1081 }
1082 curnode = &curnode->branch[ip.s6_addr[i]];
1083 i++;
1084 }
1085
1086 curnode->sess = s;
1087
1088 if (s > 0)
1089 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1090 inet_ntop(AF_INET6, &ip, ipv6addr,
1091 INET6_ADDRSTRLEN),
1092 prefixlen);
1093 else if (s == 0)
1094 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1095 inet_ntop(AF_INET6, &ip, ipv6addr,
1096 INET6_ADDRSTRLEN),
1097 prefixlen);
1098 }
1099
1100 //
1101 // CLI list to dump current ipcache.
1102 //
1103 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1104 {
1105 union iphash *d = ip_hash, *e, *f, *g;
1106 int i, j, k, l;
1107 int count = 0;
1108
1109 if (CLI_HELP_REQUESTED)
1110 return CLI_HELP_NO_ARGS;
1111
1112 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1113
1114 for (i = 0; i < 256; ++i)
1115 {
1116 if (!d[i].idx)
1117 continue;
1118
1119 e = d[i].idx;
1120 for (j = 0; j < 256; ++j)
1121 {
1122 if (!e[j].idx)
1123 continue;
1124
1125 f = e[j].idx;
1126 for (k = 0; k < 256; ++k)
1127 {
1128 if (!f[k].idx)
1129 continue;
1130
1131 g = f[k].idx;
1132 for (l = 0; l < 256; ++l)
1133 {
1134 if (!g[l].sess)
1135 continue;
1136
1137 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1138 ++count;
1139 }
1140 }
1141 }
1142 }
1143 cli_print(cli, "%d entries in cache", count);
1144 return CLI_OK;
1145 }
1146
1147
1148 // Find session by username, 0 for not found
1149 // walled garden users aren't authenticated, so the username is
1150 // reasonably useless. Ignore them to avoid incorrect actions
1151 //
1152 // This is VERY inefficent. Don't call it often. :)
1153 //
1154 sessionidt sessionbyuser(char *username)
1155 {
1156 int s;
1157 CSTAT(sessionbyuser);
1158
1159 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1160 {
1161 if (!session[s].opened)
1162 continue;
1163
1164 if (session[s].walled_garden)
1165 continue; // Skip walled garden users.
1166
1167 if (!strncmp(session[s].user, username, 128))
1168 return s;
1169
1170 }
1171 return 0; // Not found.
1172 }
1173
1174 void send_garp(in_addr_t ip)
1175 {
1176 int s;
1177 struct ifreq ifr;
1178 uint8_t mac[6];
1179
1180 s = socket(PF_INET, SOCK_DGRAM, 0);
1181 if (s < 0)
1182 {
1183 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1184 return;
1185 }
1186 memset(&ifr, 0, sizeof(ifr));
1187 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1188 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1189 {
1190 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1191 close(s);
1192 return;
1193 }
1194 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1195 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1196 {
1197 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1198 close(s);
1199 return;
1200 }
1201 close(s);
1202 sendarp(ifr.ifr_ifindex, mac, ip);
1203 }
1204
1205 static sessiont *sessiontbysessionidt(sessionidt s)
1206 {
1207 if (!s || s >= MAXSESSION) return NULL;
1208 return &session[s];
1209 }
1210
1211 static sessionidt sessionidtbysessiont(sessiont *s)
1212 {
1213 sessionidt val = s-session;
1214 if (s < session || val >= MAXSESSION) return 0;
1215 return val;
1216 }
1217
1218 // actually send a control message for a specific tunnel
1219 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1220 {
1221 struct sockaddr_in addr;
1222
1223 CSTAT(tunnelsend);
1224
1225 if (!t)
1226 {
1227 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1228 STAT(tunnel_tx_errors);
1229 return;
1230 }
1231
1232 if (t == TUNNEL_ID_PPPOE)
1233 {
1234 pppoe_sess_send(buf, l, t);
1235 return;
1236 }
1237
1238 if (!tunnel[t].ip)
1239 {
1240 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1241 STAT(tunnel_tx_errors);
1242 return;
1243 }
1244
1245 memset(&addr, 0, sizeof(addr));
1246 addr.sin_family = AF_INET;
1247 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1248 addr.sin_port = htons(tunnel[t].port);
1249
1250 // sequence expected, if sequence in message
1251 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1252
1253 // If this is a control message, deal with retries
1254 if (*buf & 0x80)
1255 {
1256 tunnel[t].last = time_now; // control message sent
1257 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1258 if (tunnel[t].try)
1259 {
1260 STAT(tunnel_retries);
1261 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1262 }
1263 }
1264
1265 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1266 {
1267 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1268 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1269 STAT(tunnel_tx_errors);
1270 return;
1271 }
1272
1273 LOG_HEX(5, "Send Tunnel Data", buf, l);
1274 STAT(tunnel_tx_packets);
1275 INC_STAT(tunnel_tx_bytes, l);
1276 }
1277
1278 //
1279 // Tiny helper function to write data to
1280 // the 'tun' device.
1281 //
1282 int tun_write(uint8_t * data, int size)
1283 {
1284 return write(tunfd, data, size);
1285 }
1286
1287 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1288 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1289 {
1290 int d = (tcp[12] >> 4) * 4;
1291 uint8_t *mss = 0;
1292 uint8_t *opts;
1293 uint8_t *data;
1294 uint16_t orig;
1295 uint32_t sum;
1296
1297 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1298 return;
1299
1300 if (tcp + d > buf + len) // short?
1301 return;
1302
1303 opts = tcp + 20;
1304 data = tcp + d;
1305
1306 while (opts < data)
1307 {
1308 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1309 {
1310 mss = opts + 2;
1311 if (mss + 2 > data) return; // short?
1312 break;
1313 }
1314
1315 if (*opts == 0) return; // end of options
1316 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1317 opts++;
1318 else
1319 opts += opts[1]; // skip over option
1320 }
1321
1322 if (!mss) return; // not found
1323 orig = ntohs(*(uint16_t *) mss);
1324
1325 if (orig <= MSS) return; // mss OK
1326
1327 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1328 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1329 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1330 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1331
1332 // set mss
1333 *(int16_t *) mss = htons(MSS);
1334
1335 // adjust checksum (see rfc1141)
1336 sum = orig + (~MSS & 0xffff);
1337 sum += ntohs(*(uint16_t *) (tcp + 16));
1338 sum = (sum & 0xffff) + (sum >> 16);
1339 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1340 }
1341
1342 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1343 {
1344 uint16_t proto;
1345 if (extra) {
1346 // Skip the four extra bytes
1347 p += 4;
1348 l -= 4;
1349 }
1350
1351 if (*p & 1)
1352 {
1353 proto = *p++;
1354 l--;
1355 }
1356 else
1357 {
1358 proto = ntohs(*(uint16_t *) p);
1359 p += 2;
1360 l -= 2;
1361 }
1362 if (proto == PPPIP)
1363 {
1364 if (session[s].die)
1365 {
1366 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1367 return; // closing session, PPP not processed
1368 }
1369 session[s].last_packet = session[s].last_data = time_now;
1370 processipin(s, t, p, l);
1371 }
1372 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1373 {
1374 if (session[s].die)
1375 {
1376 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1377 return; // closing session, PPP not processed
1378 }
1379
1380 session[s].last_packet = session[s].last_data = time_now;
1381 processipv6in(s, t, p, l);
1382 }
1383 else if (proto == PPPIPCP)
1384 {
1385 session[s].last_packet = session[s].last_data = time_now;
1386 processipcp(s, t, p, l);
1387 }
1388 else if (proto == PPPCCP)
1389 {
1390 session[s].last_packet = session[s].last_data = time_now;
1391 processccp(s, t, p, l);
1392 }
1393 else
1394 {
1395 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1396 }
1397 }
1398
1399 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1400 {
1401 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1402 sp->cout_delta += len;
1403 sp->pout++;
1404 sp->last_data = time_now;
1405
1406 sess_local[s].cout += len; // To send to master..
1407 sess_local[s].pout++;
1408 }
1409
1410 // process outgoing (to tunnel) IP
1411 //
1412 // (i.e. this routine writes to data[-8]).
1413 void processipout(uint8_t *buf, int len)
1414 {
1415 sessionidt s;
1416 sessiont *sp;
1417 tunnelidt t;
1418 in_addr_t ip;
1419
1420 uint8_t *data = buf; // Keep a copy of the originals.
1421 int size = len;
1422
1423 uint8_t fragbuf[MAXETHER + 20];
1424
1425 CSTAT(processipout);
1426
1427 if (len < MIN_IP_SIZE)
1428 {
1429 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1430 STAT(tun_rx_errors);
1431 return;
1432 }
1433 if (len >= MAXETHER)
1434 {
1435 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1436 STAT(tun_rx_errors);
1437 return;
1438 }
1439
1440 // Skip the tun header
1441 buf += 4;
1442 len -= 4;
1443
1444 // Got an IP header now
1445 if (*(uint8_t *)(buf) >> 4 != 4)
1446 {
1447 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1448 return;
1449 }
1450
1451 ip = *(uint32_t *)(buf + 16);
1452 if (!(s = sessionbyip(ip)))
1453 {
1454 // Is this a packet for a session that doesn't exist?
1455 static int rate = 0; // Number of ICMP packets we've sent this second.
1456 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1457
1458 if (last != time_now)
1459 {
1460 last = time_now;
1461 rate = 0;
1462 }
1463
1464 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1465 {
1466 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1467 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1468 config->bind_address ? config->bind_address : my_address, buf, len);
1469 }
1470 return;
1471 }
1472
1473 t = session[s].tunnel;
1474 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1475 {
1476 LOG(3, s, t, "Packet size more than session MRU\n");
1477 return;
1478 }
1479
1480 sp = &session[s];
1481
1482 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1483 if (config->max_packets > 0)
1484 {
1485 if (sess_local[s].last_packet_out == TIME)
1486 {
1487 int max = config->max_packets;
1488
1489 // All packets for throttled sessions are handled by the
1490 // master, so further limit by using the throttle rate.
1491 // A bit of a kludge, since throttle rate is in kbps,
1492 // but should still be generous given our average DSL
1493 // packet size is 200 bytes: a limit of 28kbps equates
1494 // to around 180 packets per second.
1495 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1496 max = sp->throttle_out;
1497
1498 if (++sess_local[s].packets_out > max)
1499 {
1500 sess_local[s].packets_dropped++;
1501 return;
1502 }
1503 }
1504 else
1505 {
1506 if (sess_local[s].packets_dropped)
1507 {
1508 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1509 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1510 sess_local[s].packets_dropped, sess_local[s].packets_out,
1511 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1512 sp->user);
1513 }
1514
1515 sess_local[s].last_packet_out = TIME;
1516 sess_local[s].packets_out = 1;
1517 sess_local[s].packets_dropped = 0;
1518 }
1519 }
1520
1521 // run access-list if any
1522 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1523 return;
1524
1525 // adjust MSS on SYN and SYN,ACK packets with options
1526 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1527 {
1528 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1529 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1530 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1531 }
1532
1533 if (sp->tbf_out)
1534 {
1535 // Are we throttling this session?
1536 if (config->cluster_iam_master)
1537 tbf_queue_packet(sp->tbf_out, data, size);
1538 else
1539 master_throttle_packet(sp->tbf_out, data, size);
1540 return;
1541 }
1542
1543 if (sp->walled_garden && !config->cluster_iam_master)
1544 {
1545 // We are walled-gardening this
1546 master_garden_packet(s, data, size);
1547 return;
1548 }
1549
1550 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1551 {
1552
1553 if (!config->cluster_iam_master)
1554 {
1555 // The MPPP packets must be managed by the Master.
1556 master_forward_mppp_packet(s, data, size);
1557 return;
1558 }
1559
1560 // Add on L2TP header
1561 sessionidt members[MAXBUNDLESES];
1562 bundleidt bid = session[s].bundle;
1563 bundlet *b = &bundle[bid];
1564 uint32_t num_of_links, nb_opened;
1565 int i;
1566
1567 num_of_links = b->num_of_links;
1568 nb_opened = 0;
1569 for (i = 0;i < num_of_links;i++)
1570 {
1571 s = b->members[i];
1572 if (session[s].ppp.lcp == Opened)
1573 {
1574 members[nb_opened] = s;
1575 nb_opened++;
1576 }
1577 }
1578
1579 if (nb_opened < 1)
1580 {
1581 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1582 return;
1583 }
1584
1585 num_of_links = nb_opened;
1586 b->current_ses = (b->current_ses + 1) % num_of_links;
1587 s = members[b->current_ses];
1588 t = session[s].tunnel;
1589 sp = &session[s];
1590 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1591
1592 if (num_of_links > 1)
1593 {
1594 if(len > MINFRAGLEN)
1595 {
1596 //for rotate traffic among the member links
1597 uint32_t divisor = num_of_links;
1598 if (divisor > 2)
1599 divisor = divisor/2 + (divisor & 1);
1600
1601 // Partition the packet to "num_of_links" fragments
1602 uint32_t fraglen = len / divisor;
1603 uint32_t last_fraglen = fraglen + len % divisor;
1604 uint32_t remain = len;
1605
1606 // send the first packet
1607 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1608 if (!p) return;
1609 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1610
1611 // statistics
1612 update_session_out_stat(s, sp, fraglen);
1613
1614 remain -= fraglen;
1615 while (remain > last_fraglen)
1616 {
1617 b->current_ses = (b->current_ses + 1) % num_of_links;
1618 s = members[b->current_ses];
1619 t = session[s].tunnel;
1620 sp = &session[s];
1621 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1622 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1623 if (!p) return;
1624 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1625 update_session_out_stat(s, sp, fraglen);
1626 remain -= fraglen;
1627 }
1628 // send the last fragment
1629 b->current_ses = (b->current_ses + 1) % num_of_links;
1630 s = members[b->current_ses];
1631 t = session[s].tunnel;
1632 sp = &session[s];
1633 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1634 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1635 if (!p) return;
1636 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1637 update_session_out_stat(s, sp, remain);
1638 if (remain != last_fraglen)
1639 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1640 }
1641 else
1642 {
1643 // Send it as one frame
1644 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1645 if (!p) return;
1646 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1647 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1648 update_session_out_stat(s, sp, len);
1649 }
1650 }
1651 else
1652 {
1653 // Send it as one frame (NO MPPP Frame)
1654 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1655 tunnelsend(p, len + (buf-p), t); // send it...
1656 update_session_out_stat(s, sp, len);
1657 }
1658 }
1659 else
1660 {
1661 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1662 tunnelsend(p, len + (buf-p), t); // send it...
1663 update_session_out_stat(s, sp, len);
1664 }
1665
1666 // Snooping this session, send it to intercept box
1667 if (sp->snoop_ip && sp->snoop_port)
1668 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1669
1670 udp_tx += len;
1671 }
1672
1673 // process outgoing (to tunnel) IPv6
1674 //
1675 static void processipv6out(uint8_t * buf, int len)
1676 {
1677 sessionidt s;
1678 sessiont *sp;
1679 tunnelidt t;
1680 in_addr_t ip;
1681 struct in6_addr ip6;
1682
1683 uint8_t *data = buf; // Keep a copy of the originals.
1684 int size = len;
1685
1686 uint8_t b[MAXETHER + 20];
1687
1688 CSTAT(processipv6out);
1689
1690 if (len < MIN_IP_SIZE)
1691 {
1692 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1693 STAT(tunnel_tx_errors);
1694 return;
1695 }
1696 if (len >= MAXETHER)
1697 {
1698 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1699 STAT(tunnel_tx_errors);
1700 return;
1701 }
1702
1703 // Skip the tun header
1704 buf += 4;
1705 len -= 4;
1706
1707 // Got an IP header now
1708 if (*(uint8_t *)(buf) >> 4 != 6)
1709 {
1710 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1711 return;
1712 }
1713
1714 ip6 = *(struct in6_addr *)(buf+24);
1715 s = sessionbyipv6(ip6);
1716
1717 if (s == 0)
1718 {
1719 ip = *(uint32_t *)(buf + 32);
1720 s = sessionbyip(ip);
1721 }
1722
1723 if (s == 0)
1724 {
1725 // Is this a packet for a session that doesn't exist?
1726 static int rate = 0; // Number of ICMP packets we've sent this second.
1727 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1728
1729 if (last != time_now)
1730 {
1731 last = time_now;
1732 rate = 0;
1733 }
1734
1735 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1736 {
1737 // FIXME: Should send icmp6 host unreachable
1738 }
1739 return;
1740 }
1741 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1742 {
1743 bundleidt bid = session[s].bundle;
1744 bundlet *b = &bundle[bid];
1745
1746 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1747 s = b->members[b->current_ses];
1748 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1749 }
1750 t = session[s].tunnel;
1751 sp = &session[s];
1752 sp->last_data = time_now;
1753
1754 // FIXME: add DoS prevention/filters?
1755
1756 if (sp->tbf_out)
1757 {
1758 // Are we throttling this session?
1759 if (config->cluster_iam_master)
1760 tbf_queue_packet(sp->tbf_out, data, size);
1761 else
1762 master_throttle_packet(sp->tbf_out, data, size);
1763 return;
1764 }
1765 else if (sp->walled_garden && !config->cluster_iam_master)
1766 {
1767 // We are walled-gardening this
1768 master_garden_packet(s, data, size);
1769 return;
1770 }
1771
1772 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1773
1774 // Add on L2TP header
1775 {
1776 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1777 if (!p) return;
1778 tunnelsend(b, len + (p-b), t); // send it...
1779 }
1780
1781 // Snooping this session, send it to intercept box
1782 if (sp->snoop_ip && sp->snoop_port)
1783 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1784
1785 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1786 sp->cout_delta += len;
1787 sp->pout++;
1788 udp_tx += len;
1789
1790 sess_local[s].cout += len; // To send to master..
1791 sess_local[s].pout++;
1792 }
1793
1794 //
1795 // Helper routine for the TBF filters.
1796 // Used to send queued data in to the user!
1797 //
1798 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1799 {
1800 sessiont *sp;
1801 tunnelidt t;
1802
1803 uint8_t b[MAXETHER + 20];
1804
1805 if (len < 0 || len > MAXETHER)
1806 {
1807 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1808 return;
1809 }
1810
1811 // Skip the tun header
1812 buf += 4;
1813 len -= 4;
1814
1815 if (!session[s].ip)
1816 return;
1817
1818 t = session[s].tunnel;
1819 sp = &session[s];
1820
1821 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1822
1823 // Add on L2TP header
1824 {
1825 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1826 if (!p) return;
1827 tunnelsend(b, len + (p-b), t); // send it...
1828 }
1829
1830 // Snooping this session.
1831 if (sp->snoop_ip && sp->snoop_port)
1832 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1833
1834 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1835 sp->cout_delta += len;
1836 sp->pout++;
1837 udp_tx += len;
1838
1839 sess_local[s].cout += len; // To send to master..
1840 sess_local[s].pout++;
1841 }
1842
1843 // add an AVP (16 bit)
1844 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1845 {
1846 uint16_t l = (m ? 0x8008 : 0x0008);
1847 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1848 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1849 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1850 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1851 c->length += 8;
1852 }
1853
1854 // add an AVP (32 bit)
1855 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1856 {
1857 uint16_t l = (m ? 0x800A : 0x000A);
1858 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1859 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1860 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1861 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1862 c->length += 10;
1863 }
1864
1865 // add an AVP (string)
1866 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1867 {
1868 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1869 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1870 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1871 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1872 memcpy(c->buf + c->length + 6, val, strlen(val));
1873 c->length += 6 + strlen(val);
1874 }
1875
1876 // add a binary AVP
1877 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1878 {
1879 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1880 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1881 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1882 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1883 memcpy(c->buf + c->length + 6, val, len);
1884 c->length += 6 + len;
1885 }
1886
1887 // new control connection
1888 static controlt *controlnew(uint16_t mtype)
1889 {
1890 controlt *c;
1891 if (!controlfree)
1892 c = malloc(sizeof(controlt));
1893 else
1894 {
1895 c = controlfree;
1896 controlfree = c->next;
1897 }
1898 assert(c);
1899 c->next = 0;
1900 c->buf[0] = 0xC8; // flags
1901 c->buf[1] = 0x02; // ver
1902 c->length = 12;
1903 control16(c, 0, mtype, 1);
1904 return c;
1905 }
1906
1907 // send zero block if nothing is waiting
1908 // (ZLB send).
1909 static void controlnull(tunnelidt t)
1910 {
1911 uint16_t buf[6];
1912 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1913 return;
1914
1915 buf[0] = htons(0xC802); // flags/ver
1916 buf[1] = htons(12); // length
1917 buf[2] = htons(tunnel[t].far); // tunnel
1918 buf[3] = htons(0); // session
1919 buf[4] = htons(tunnel[t].ns); // sequence
1920 buf[5] = htons(tunnel[t].nr); // sequence
1921 tunnelsend((uint8_t *)buf, 12, t);
1922 }
1923
1924 // add a control message to a tunnel, and send if within window
1925 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1926 {
1927 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1928 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1929 *(uint16_t *) (c->buf + 6) = htons(far); // session
1930 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1931 tunnel[t].ns++; // advance sequence
1932 // link in message in to queue
1933 if (tunnel[t].controlc)
1934 tunnel[t].controle->next = c;
1935 else
1936 tunnel[t].controls = c;
1937
1938 tunnel[t].controle = c;
1939 tunnel[t].controlc++;
1940
1941 // send now if space in window
1942 if (tunnel[t].controlc <= tunnel[t].window)
1943 {
1944 tunnel[t].try = 0; // first send
1945 tunnelsend(c->buf, c->length, t);
1946 }
1947 }
1948
1949 //
1950 // Throttle or Unthrottle a session
1951 //
1952 // Throttle the data from/to through a session to no more than
1953 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1954 // user).
1955 //
1956 // If either value is -1, the current value is retained for that
1957 // direction.
1958 //
1959 void throttle_session(sessionidt s, int rate_in, int rate_out)
1960 {
1961 if (!session[s].opened)
1962 return; // No-one home.
1963
1964 if (!*session[s].user)
1965 return; // User not logged in
1966
1967 if (rate_in >= 0)
1968 {
1969 int bytes = rate_in * 1024 / 8; // kbits to bytes
1970 if (session[s].tbf_in)
1971 free_tbf(session[s].tbf_in);
1972
1973 if (rate_in > 0)
1974 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1975 else
1976 session[s].tbf_in = 0;
1977
1978 session[s].throttle_in = rate_in;
1979 }
1980
1981 if (rate_out >= 0)
1982 {
1983 int bytes = rate_out * 1024 / 8;
1984 if (session[s].tbf_out)
1985 free_tbf(session[s].tbf_out);
1986
1987 if (rate_out > 0)
1988 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1989 else
1990 session[s].tbf_out = 0;
1991
1992 session[s].throttle_out = rate_out;
1993 }
1994 }
1995
1996 // add/remove filters from session (-1 = no change)
1997 void filter_session(sessionidt s, int filter_in, int filter_out)
1998 {
1999 if (!session[s].opened)
2000 return; // No-one home.
2001
2002 if (!*session[s].user)
2003 return; // User not logged in
2004
2005 // paranoia
2006 if (filter_in > MAXFILTER) filter_in = -1;
2007 if (filter_out > MAXFILTER) filter_out = -1;
2008 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2009 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2010
2011 if (filter_in >= 0)
2012 {
2013 if (session[s].filter_in)
2014 ip_filters[session[s].filter_in - 1].used--;
2015
2016 if (filter_in > 0)
2017 ip_filters[filter_in - 1].used++;
2018
2019 session[s].filter_in = filter_in;
2020 }
2021
2022 if (filter_out >= 0)
2023 {
2024 if (session[s].filter_out)
2025 ip_filters[session[s].filter_out - 1].used--;
2026
2027 if (filter_out > 0)
2028 ip_filters[filter_out - 1].used++;
2029
2030 session[s].filter_out = filter_out;
2031 }
2032 }
2033
2034 // start tidy shutdown of session
2035 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2036 {
2037 int walled_garden = session[s].walled_garden;
2038 bundleidt b = session[s].bundle;
2039 //delete routes only for last session in bundle (in case of MPPP)
2040 int del_routes = !b || (bundle[b].num_of_links == 1);
2041
2042 CSTAT(sessionshutdown);
2043
2044 if (!session[s].opened)
2045 {
2046 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2047 return; // not a live session
2048 }
2049
2050 if (!session[s].die)
2051 {
2052 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2053 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2054 run_plugins(PLUGIN_KILL_SESSION, &data);
2055 }
2056
2057 if (session[s].ip && !walled_garden && !session[s].die)
2058 {
2059 // RADIUS Stop message
2060 uint16_t r = radiusnew(s);
2061 if (r)
2062 {
2063 // stop, if not already trying
2064 if (radius[r].state != RADIUSSTOP)
2065 {
2066 radius[r].term_cause = term_cause;
2067 radius[r].term_msg = reason;
2068 radiussend(r, RADIUSSTOP);
2069 }
2070 }
2071 else
2072 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2073
2074 // Save counters to dump to accounting file
2075 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2076 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2077 }
2078
2079 if (!session[s].die)
2080 session[s].die = TIME + 150; // Clean up in 15 seconds
2081
2082 if (session[s].ip)
2083 { // IP allocated, clear and unroute
2084 int r;
2085 int routed = 0;
2086 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2087 {
2088 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2089 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2090 routed++;
2091
2092 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2093 session[s].route[r].ip = 0;
2094 }
2095
2096 if (session[s].ip_pool_index == -1) // static ip
2097 {
2098 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2099 session[s].ip = 0;
2100 }
2101 else
2102 free_ip_address(s);
2103
2104 // unroute IPv6, if setup
2105 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2106 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2107
2108 if (b)
2109 {
2110 // This session was part of a bundle
2111 bundle[b].num_of_links--;
2112 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2113 if(bundle[b].num_of_links == 0)
2114 {
2115 bundleclear(b);
2116 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2117 }
2118 else
2119 {
2120 // Adjust the members array to accomodate the new change
2121 uint8_t mem_num = 0;
2122 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2123 if(bundle[b].members[bundle[b].num_of_links] != s)
2124 {
2125 uint8_t ml;
2126 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2127 if(bundle[b].members[ml] == s)
2128 {
2129 mem_num = ml;
2130 break;
2131 }
2132 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2133 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2134
2135 // If the killed session is the first of the bundle,
2136 // the new first session must be stored in the cache_ipmap
2137 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2138 if (mem_num == 0)
2139 {
2140 sessionidt new_s = bundle[b].members[0];
2141
2142 routed = 0;
2143 // Add the route for this session.
2144 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2145 {
2146 int i, prefixlen;
2147 in_addr_t ip;
2148
2149 prefixlen = session[new_s].route[r].prefixlen;
2150 ip = session[new_s].route[r].ip;
2151
2152 if (!prefixlen) prefixlen = 32;
2153 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2154
2155 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2156 cache_ipmap(i, new_s);
2157 }
2158 cache_ipmap(session[new_s].ip, new_s);
2159
2160 // IPV6 route
2161 if (session[new_s].ipv6prefixlen)
2162 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2163 }
2164 }
2165 }
2166
2167 cluster_send_bundle(b);
2168 }
2169 }
2170
2171 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2172 throttle_session(s, 0, 0);
2173
2174 if (cdn_result)
2175 {
2176 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2177 {
2178 pppoe_shutdown_session(s);
2179 }
2180 else
2181 {
2182 // Send CDN
2183 controlt *c = controlnew(14); // sending CDN
2184 if (cdn_error)
2185 {
2186 uint16_t buf[2];
2187 buf[0] = htons(cdn_result);
2188 buf[1] = htons(cdn_error);
2189 controlb(c, 1, (uint8_t *)buf, 4, 1);
2190 }
2191 else
2192 control16(c, 1, cdn_result, 1);
2193
2194 control16(c, 14, s, 1); // assigned session (our end)
2195 controladd(c, session[s].far, session[s].tunnel); // send the message
2196 }
2197 }
2198
2199 // update filter refcounts
2200 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2201 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2202
2203 // clear PPP state
2204 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2205 sess_local[s].lcp.restart = 0;
2206 sess_local[s].ipcp.restart = 0;
2207 sess_local[s].ipv6cp.restart = 0;
2208 sess_local[s].ccp.restart = 0;
2209
2210 cluster_send_session(s);
2211 }
2212
2213 void sendipcp(sessionidt s, tunnelidt t)
2214 {
2215 uint8_t buf[MAXETHER];
2216 uint8_t *q;
2217
2218 CSTAT(sendipcp);
2219 LOG(3, s, t, "IPCP: send ConfigReq\n");
2220
2221 if (!session[s].unique_id)
2222 {
2223 if (!++last_id) ++last_id; // skip zero
2224 session[s].unique_id = last_id;
2225 }
2226
2227 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2228 if (!q) return;
2229
2230 *q = ConfigReq;
2231 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2232 *(uint16_t *) (q + 2) = htons(10); // packet length
2233 q[4] = 3; // ip address option
2234 q[5] = 6; // option length
2235 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2236 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2237 my_address; // send my IP
2238
2239 tunnelsend(buf, 10 + (q - buf), t); // send it
2240 restart_timer(s, ipcp);
2241 }
2242
2243 void sendipv6cp(sessionidt s, tunnelidt t)
2244 {
2245 uint8_t buf[MAXETHER];
2246 uint8_t *q;
2247
2248 CSTAT(sendipv6cp);
2249 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2250
2251 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2252 if (!q) return;
2253
2254 *q = ConfigReq;
2255 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2256 // only send one type
2257 // of request
2258 *(uint16_t *) (q + 2) = htons(14);
2259 q[4] = 1; // interface identifier option
2260 q[5] = 10; // option length
2261 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2262 *(uint32_t *) (q + 10) = 0;
2263 q[13] = 1;
2264
2265 tunnelsend(buf, 14 + (q - buf), t); // send it
2266 restart_timer(s, ipv6cp);
2267 }
2268
2269 static void sessionclear(sessionidt s)
2270 {
2271 memset(&session[s], 0, sizeof(session[s]));
2272 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2273 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2274
2275 session[s].tunnel = T_FREE; // Mark it as free.
2276 session[s].next = sessionfree;
2277 sessionfree = s;
2278 }
2279
2280 // kill a session now
2281 void sessionkill(sessionidt s, char *reason)
2282 {
2283 CSTAT(sessionkill);
2284
2285 if (!session[s].opened) // not alive
2286 return;
2287
2288 if (session[s].next)
2289 {
2290 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2291 return;
2292 }
2293
2294 if (!session[s].die)
2295 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2296
2297 if (sess_local[s].radius)
2298 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2299
2300 if (session[s].forwardtosession)
2301 {
2302 sessionidt sess = session[s].forwardtosession;
2303 if (session[sess].forwardtosession == s)
2304 {
2305 // Shutdown the linked session also.
2306 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2307 }
2308 }
2309
2310 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2311 sessionclear(s);
2312 cluster_send_session(s);
2313 }
2314
2315 static void tunnelclear(tunnelidt t)
2316 {
2317 if (!t) return;
2318 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2319 tunnel[t].state = TUNNELFREE;
2320 }
2321
2322 static void bundleclear(bundleidt b)
2323 {
2324 if (!b) return;
2325 memset(&bundle[b], 0, sizeof(bundle[b]));
2326 bundle[b].state = BUNDLEFREE;
2327 }
2328
2329 // kill a tunnel now
2330 static void tunnelkill(tunnelidt t, char *reason)
2331 {
2332 sessionidt s;
2333 controlt *c;
2334
2335 CSTAT(tunnelkill);
2336
2337 tunnel[t].state = TUNNELDIE;
2338
2339 // free control messages
2340 while ((c = tunnel[t].controls))
2341 {
2342 controlt * n = c->next;
2343 tunnel[t].controls = n;
2344 tunnel[t].controlc--;
2345 c->next = controlfree;
2346 controlfree = c;
2347 }
2348 // kill sessions
2349 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2350 if (session[s].tunnel == t)
2351 sessionkill(s, reason);
2352
2353 // free tunnel
2354 tunnelclear(t);
2355 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2356 cli_tunnel_actions[t].action = 0;
2357 cluster_send_tunnel(t);
2358 }
2359
2360 // shut down a tunnel cleanly
2361 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2362 {
2363 sessionidt s;
2364
2365 CSTAT(tunnelshutdown);
2366
2367 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2368 {
2369 // never set up, can immediately kill
2370 tunnelkill(t, reason);
2371 return;
2372 }
2373 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2374
2375 // close session
2376 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2377 if (session[s].tunnel == t)
2378 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2379
2380 tunnel[t].state = TUNNELDIE;
2381 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2382 cluster_send_tunnel(t);
2383 // TBA - should we wait for sessions to stop?
2384 if (result)
2385 {
2386 controlt *c = controlnew(4); // sending StopCCN
2387 if (error)
2388 {
2389 uint16_t buf[32];
2390 int l = 4;
2391 buf[0] = htons(result);
2392 buf[1] = htons(error);
2393 if (msg)
2394 {
2395 int m = strlen(msg);
2396 if (m + 4 > sizeof(buf))
2397 m = sizeof(buf) - 4;
2398
2399 memcpy(buf+2, msg, m);
2400 l += m;
2401 }
2402
2403 controlb(c, 1, (uint8_t *)buf, l, 1);
2404 }
2405 else
2406 control16(c, 1, result, 1);
2407
2408 control16(c, 9, t, 1); // assigned tunnel (our end)
2409 controladd(c, 0, t); // send the message
2410 }
2411 }
2412
2413 // read and process packet on tunnel (UDP)
2414 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2415 {
2416 uint8_t *sendchalresponse = NULL;
2417 uint8_t *recvchalresponse = NULL;
2418 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2419 uint8_t *p = buf + 2;
2420
2421
2422 CSTAT(processudp);
2423
2424 udp_rx += len;
2425 udp_rx_pkt++;
2426 LOG_HEX(5, "UDP Data", buf, len);
2427 STAT(tunnel_rx_packets);
2428 INC_STAT(tunnel_rx_bytes, len);
2429 if (len < 6)
2430 {
2431 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2432 STAT(tunnel_rx_errors);
2433 return;
2434 }
2435 if ((buf[1] & 0x0F) != 2)
2436 {
2437 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2438 STAT(tunnel_rx_errors);
2439 return;
2440 }
2441 if (*buf & 0x40)
2442 { // length
2443 l = ntohs(*(uint16_t *) p);
2444 p += 2;
2445 }
2446 t = ntohs(*(uint16_t *) p);
2447 p += 2;
2448 s = ntohs(*(uint16_t *) p);
2449 p += 2;
2450 if (s >= MAXSESSION)
2451 {
2452 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2453 STAT(tunnel_rx_errors);
2454 return;
2455 }
2456 if (t >= MAXTUNNEL)
2457 {
2458 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2459 STAT(tunnel_rx_errors);
2460 return;
2461 }
2462 if (t == TUNNEL_ID_PPPOE)
2463 {
2464 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2465 STAT(tunnel_rx_errors);
2466 return;
2467 }
2468 if (*buf & 0x08)
2469 { // ns/nr
2470 ns = ntohs(*(uint16_t *) p);
2471 p += 2;
2472 nr = ntohs(*(uint16_t *) p);
2473 p += 2;
2474 }
2475 if (*buf & 0x02)
2476 { // offset
2477 uint16_t o = ntohs(*(uint16_t *) p);
2478 p += o + 2;
2479 }
2480 if ((p - buf) > l)
2481 {
2482 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2483 STAT(tunnel_rx_errors);
2484 return;
2485 }
2486 l -= (p - buf);
2487
2488 // used to time out old tunnels
2489 if (t && tunnel[t].state == TUNNELOPEN)
2490 tunnel[t].lastrec = time_now;
2491
2492 if (*buf & 0x80)
2493 { // control
2494 uint16_t message = 0xFFFF; // message type
2495 uint8_t fatal = 0;
2496 uint8_t mandatory = 0;
2497 uint16_t asession = 0; // assigned session
2498 uint32_t amagic = 0; // magic number
2499 uint8_t aflags = 0; // flags from last LCF
2500 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2501 char called[MAXTEL] = ""; // called number
2502 char calling[MAXTEL] = ""; // calling number
2503
2504 if (!config->cluster_iam_master)
2505 {
2506 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2507 return;
2508 }
2509
2510 // control messages must have bits 0x80|0x40|0x08
2511 // (type, length and sequence) set, and bits 0x02|0x01
2512 // (offset and priority) clear
2513 if ((*buf & 0xCB) != 0xC8)
2514 {
2515 LOG(1, s, t, "Bad control header %02X\n", *buf);
2516 STAT(tunnel_rx_errors);
2517 return;
2518 }
2519
2520 // check for duplicate tunnel open message
2521 if (!t && ns == 0)
2522 {
2523 int i;
2524
2525 //
2526 // Is this a duplicate of the first packet? (SCCRQ)
2527 //
2528 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2529 {
2530 if (tunnel[i].state != TUNNELOPENING ||
2531 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2532 tunnel[i].port != ntohs(addr->sin_port) )
2533 continue;
2534 t = i;
2535 LOG(3, s, t, "Duplicate SCCRQ?\n");
2536 break;
2537 }
2538 }
2539
2540 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2541 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2542
2543 // if no tunnel specified, assign one
2544 if (!t)
2545 {
2546 if (!(t = new_tunnel()))
2547 {
2548 LOG(1, 0, 0, "No more tunnels\n");
2549 STAT(tunnel_overflow);
2550 return;
2551 }
2552 tunnelclear(t);
2553 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2554 tunnel[t].port = ntohs(addr->sin_port);
2555 tunnel[t].window = 4; // default window
2556 tunnel[t].indexudp = indexudpfd;
2557 STAT(tunnel_created);
2558 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2559 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2560 }
2561
2562 // If the 'ns' just received is not the 'nr' we're
2563 // expecting, just send an ack and drop it.
2564 //
2565 // if 'ns' is less, then we got a retransmitted packet.
2566 // if 'ns' is greater than missed a packet. Either way
2567 // we should ignore it.
2568 if (ns != tunnel[t].nr)
2569 {
2570 // is this the sequence we were expecting?
2571 STAT(tunnel_rx_errors);
2572 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2573 t, ns, tunnel[t].nr);
2574
2575 if (l) // Is this not a ZLB?
2576 controlnull(t);
2577 return;
2578 }
2579
2580 // check sequence of this message
2581 {
2582 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2583 // some to clear maybe?
2584 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2585 {
2586 controlt *c = tunnel[t].controls;
2587 tunnel[t].controls = c->next;
2588 tunnel[t].controlc--;
2589 c->next = controlfree;
2590 controlfree = c;
2591 skip--;
2592 tunnel[t].try = 0; // we have progress
2593 }
2594
2595 // receiver advance (do here so quoted correctly in any sends below)
2596 if (l) tunnel[t].nr = (ns + 1);
2597 if (skip < 0) skip = 0;
2598 if (skip < tunnel[t].controlc)
2599 {
2600 // some control packets can now be sent that were previous stuck out of window
2601 int tosend = tunnel[t].window - skip;
2602 controlt *c = tunnel[t].controls;
2603 while (c && skip)
2604 {
2605 c = c->next;
2606 skip--;
2607 }
2608 while (c && tosend)
2609 {
2610 tunnel[t].try = 0; // first send
2611 tunnelsend(c->buf, c->length, t);
2612 c = c->next;
2613 tosend--;
2614 }
2615 }
2616 if (!tunnel[t].controlc)
2617 tunnel[t].retry = 0; // caught up
2618 }
2619 if (l)
2620 { // if not a null message
2621 int result = 0;
2622 int error = 0;
2623 char *msg = 0;
2624
2625 // Default disconnect cause/message on receipt of CDN. Set to
2626 // more specific value from attribute 1 (result code) or 46
2627 // (disconnect cause) if present below.
2628 int disc_cause_set = 0;
2629 int disc_cause = TERM_NAS_REQUEST;
2630 char const *disc_reason = "Closed (Received CDN).";
2631
2632 // process AVPs
2633 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2634 {
2635 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2636 uint8_t *b = p;
2637 uint8_t flags = *p;
2638 uint16_t mtype;
2639
2640 if (n > l)
2641 {
2642 LOG(1, s, t, "Invalid length in AVP\n");
2643 STAT(tunnel_rx_errors);
2644 return;
2645 }
2646 p += n; // next
2647 l -= n;
2648 if (flags & 0x3C) // reserved bits, should be clear
2649 {
2650 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2651 fatal = flags;
2652 result = 2; // general error
2653 error = 3; // reserved field non-zero
2654 msg = 0;
2655 continue; // next
2656 }
2657 b += 2;
2658 if (*(uint16_t *) (b))
2659 {
2660 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2661 fatal = flags;
2662 result = 2; // general error
2663 error = 6; // generic vendor-specific error
2664 msg = "unsupported vendor-specific";
2665 continue; // next
2666 }
2667 b += 2;
2668 mtype = ntohs(*(uint16_t *) (b));
2669 b += 2;
2670 n -= 6;
2671
2672 if (flags & 0x40)
2673 {
2674 uint16_t orig_len;
2675
2676 // handle hidden AVPs
2677 if (!*config->l2tp_secret)
2678 {
2679 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2680 fatal = flags;
2681 result = 2; // general error
2682 error = 6; // generic vendor-specific error
2683 msg = "secret not specified";
2684 continue;
2685 }
2686 if (!session[s].random_vector_length)
2687 {
2688 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2689 fatal = flags;
2690 result = 2; // general error
2691 error = 6; // generic
2692 msg = "no random vector";
2693 continue;
2694 }
2695 if (n < 8)
2696 {
2697 LOG(2, s, t, "Short hidden AVP.\n");
2698 fatal = flags;
2699 result = 2; // general error
2700 error = 2; // length is wrong
2701 msg = 0;
2702 continue;
2703 }
2704
2705 // Unhide the AVP
2706 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2707
2708 orig_len = ntohs(*(uint16_t *) b);
2709 if (orig_len > n + 2)
2710 {
2711 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2712 orig_len, n);
2713
2714 fatal = flags;
2715 result = 2; // general error
2716 error = 2; // length is wrong
2717 msg = 0;
2718 continue;
2719 }
2720
2721 b += 2;
2722 n = orig_len;
2723 }
2724
2725 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2726 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2727
2728 switch (mtype)
2729 {
2730 case 0: // message type
2731 message = ntohs(*(uint16_t *) b);
2732 mandatory = flags & 0x80;
2733 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2734 break;
2735 case 1: // result code
2736 {
2737 uint16_t rescode = ntohs(*(uint16_t *) b);
2738 char const *resdesc = "(unknown)";
2739 char const *errdesc = NULL;
2740 int cause = 0;
2741
2742 if (message == 4)
2743 { /* StopCCN */
2744 resdesc = l2tp_stopccn_result_code(rescode);
2745 cause = TERM_LOST_SERVICE;
2746 }
2747 else if (message == 14)
2748 { /* CDN */
2749 resdesc = l2tp_cdn_result_code(rescode);
2750 if (rescode == 1)
2751 cause = TERM_LOST_CARRIER;
2752 else
2753 cause = TERM_ADMIN_RESET;
2754 }
2755
2756 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2757 if (n >= 4)
2758 {
2759 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2760 errdesc = l2tp_error_code(errcode);
2761 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2762 }
2763 if (n > 4)
2764 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2765
2766 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2767 {
2768 disc_cause_set = mtype;
2769 disc_reason = errdesc ? errdesc : resdesc;
2770 disc_cause = cause;
2771 }
2772
2773 break;
2774 }
2775 break;
2776 case 2: // protocol version
2777 {
2778 version = ntohs(*(uint16_t *) (b));
2779 LOG(4, s, t, " Protocol version = %u\n", version);
2780 if (version && version != 0x0100)
2781 { // allow 0.0 and 1.0
2782 LOG(1, s, t, " Bad protocol version %04X\n", version);
2783 fatal = flags;
2784 result = 5; // unspported protocol version
2785 error = 0x0100; // supported version
2786 msg = 0;
2787 continue; // next
2788 }
2789 }
2790 break;
2791 case 3: // framing capabilities
2792 break;
2793 case 4: // bearer capabilities
2794 break;
2795 case 5: // tie breaker
2796 // We never open tunnels, so we don't care about tie breakers
2797 continue;
2798 case 6: // firmware revision
2799 break;
2800 case 7: // host name
2801 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2802 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2803 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2804 // TBA - to send to RADIUS
2805 break;
2806 case 8: // vendor name
2807 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2808 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2809 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2810 break;
2811 case 9: // assigned tunnel
2812 tunnel[t].far = ntohs(*(uint16_t *) (b));
2813 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2814 break;
2815 case 10: // rx window
2816 tunnel[t].window = ntohs(*(uint16_t *) (b));
2817 if (!tunnel[t].window)
2818 tunnel[t].window = 1; // window of 0 is silly
2819 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2820 break;
2821 case 11: // Request Challenge
2822 {
2823 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2824 if (message == 1)
2825 build_chap_response(b, 2, n, &sendchalresponse);
2826 else if (message == 2)
2827 build_chap_response(b, 3, n, &sendchalresponse);
2828 }
2829 break;
2830 case 13: // receive challenge Response
2831 if (tunnel[t].isremotelns)
2832 {
2833 recvchalresponse = calloc(17, 1);
2834 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2835 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2836 }
2837 else
2838 // Why did they send a response? We never challenge.
2839 LOG(2, s, t, " received unexpected challenge response\n");
2840 break;
2841
2842 case 14: // assigned session
2843 asession = session[s].far = ntohs(*(uint16_t *) (b));
2844 LOG(4, s, t, " assigned session = %u\n", asession);
2845 break;
2846 case 15: // call serial number
2847 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2848 break;
2849 case 18: // bearer type
2850 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2851 // TBA - for RADIUS
2852 break;
2853 case 19: // framing type
2854 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2855 // TBA
2856 break;
2857 case 21: // called number
2858 memset(called, 0, sizeof(called));
2859 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2860 LOG(4, s, t, " Called <%s>\n", called);
2861 break;
2862 case 22: // calling number
2863 memset(calling, 0, sizeof(calling));
2864 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2865 LOG(4, s, t, " Calling <%s>\n", calling);
2866 break;
2867 case 23: // subtype
2868 break;
2869 case 24: // tx connect speed
2870 if (n == 4)
2871 {
2872 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2873 }
2874 else
2875 {
2876 // AS5300s send connect speed as a string
2877 char tmp[30];
2878 memset(tmp, 0, sizeof(tmp));
2879 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2880 session[s].tx_connect_speed = atol(tmp);
2881 }
2882 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2883 break;
2884 case 38: // rx connect speed
2885 if (n == 4)
2886 {
2887 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2888 }
2889 else
2890 {
2891 // AS5300s send connect speed as a string
2892 char tmp[30];
2893 memset(tmp, 0, sizeof(tmp));
2894 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2895 session[s].rx_connect_speed = atol(tmp);
2896 }
2897 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2898 break;
2899 case 25: // Physical Channel ID
2900 {
2901 uint32_t tmp = ntohl(*(uint32_t *) b);
2902 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2903 break;
2904 }
2905 case 29: // Proxy Authentication Type
2906 {
2907 uint16_t atype = ntohs(*(uint16_t *)b);
2908 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2909 break;
2910 }
2911 case 30: // Proxy Authentication Name
2912 {
2913 char authname[64];
2914 memset(authname, 0, sizeof(authname));
2915 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2916 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2917 authname);
2918 break;
2919 }
2920 case 31: // Proxy Authentication Challenge
2921 {
2922 LOG(4, s, t, " Proxy Auth Challenge\n");
2923 break;
2924 }
2925 case 32: // Proxy Authentication ID
2926 {
2927 uint16_t authid = ntohs(*(uint16_t *)(b));
2928 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2929 break;
2930 }
2931 case 33: // Proxy Authentication Response
2932 LOG(4, s, t, " Proxy Auth Response\n");
2933 break;
2934 case 27: // last sent lcp
2935 { // find magic number
2936 uint8_t *p = b, *e = p + n;
2937 while (p + 1 < e && p[1] && p + p[1] <= e)
2938 {
2939 if (*p == 5 && p[1] == 6) // Magic-Number
2940 amagic = ntohl(*(uint32_t *) (p + 2));
2941 else if (*p == 7) // Protocol-Field-Compression
2942 aflags |= SESSION_PFC;
2943 else if (*p == 8) // Address-and-Control-Field-Compression
2944 aflags |= SESSION_ACFC;
2945 p += p[1];
2946 }
2947 }
2948 break;
2949 case 28: // last recv lcp confreq
2950 break;
2951 case 26: // Initial Received LCP CONFREQ
2952 break;
2953 case 39: // seq required - we control it as an LNS anyway...
2954 break;
2955 case 36: // Random Vector
2956 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2957 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2958 if (n > sizeof(session[s].random_vector))
2959 n = sizeof(session[s].random_vector);
2960 memcpy(session[s].random_vector, b, n);
2961 session[s].random_vector_length = n;
2962 break;
2963 case 46: // ppp disconnect cause
2964 if (n >= 5)
2965 {
2966 uint16_t code = ntohs(*(uint16_t *) b);
2967 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2968 uint8_t dir = *(b + 4);
2969
2970 LOG(4, s, t, " PPP disconnect cause "
2971 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2972 code, proto, dir, n - 5, b + 5);
2973
2974 disc_cause_set = mtype;
2975
2976 switch (code)
2977 {
2978 case 1: // admin disconnect
2979 disc_cause = TERM_ADMIN_RESET;
2980 disc_reason = "Administrative disconnect";
2981 break;
2982 case 3: // lcp terminate
2983 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2984 disc_cause = TERM_USER_REQUEST;
2985 disc_reason = "Normal disconnection";
2986 break;
2987 case 4: // compulsory encryption unavailable
2988 if (dir != 1) break; // 1=refused by peer, 2=local
2989 disc_cause = TERM_USER_ERROR;
2990 disc_reason = "Compulsory encryption refused";
2991 break;
2992 case 5: // lcp: fsm timeout
2993 disc_cause = TERM_PORT_ERROR;
2994 disc_reason = "LCP: FSM timeout";
2995 break;
2996 case 6: // lcp: no recognisable lcp packets received
2997 disc_cause = TERM_PORT_ERROR;
2998 disc_reason = "LCP: no recognisable LCP packets";
2999 break;
3000 case 7: // lcp: magic-no error (possibly looped back)
3001 disc_cause = TERM_PORT_ERROR;
3002 disc_reason = "LCP: magic-no error (possible loop)";
3003 break;
3004 case 8: // lcp: echo request timeout
3005 disc_cause = TERM_PORT_ERROR;
3006 disc_reason = "LCP: echo request timeout";
3007 break;
3008 case 13: // auth: fsm timeout
3009 disc_cause = TERM_SERVICE_UNAVAILABLE;
3010 disc_reason = "Authentication: FSM timeout";
3011 break;
3012 case 15: // auth: unacceptable auth protocol
3013 disc_cause = TERM_SERVICE_UNAVAILABLE;
3014 disc_reason = "Unacceptable authentication protocol";
3015 break;
3016 case 16: // auth: authentication failed
3017 disc_cause = TERM_SERVICE_UNAVAILABLE;
3018 disc_reason = "Authentication failed";
3019 break;
3020 case 17: // ncp: fsm timeout
3021 disc_cause = TERM_SERVICE_UNAVAILABLE;
3022 disc_reason = "NCP: FSM timeout";
3023 break;
3024 case 18: // ncp: no ncps available
3025 disc_cause = TERM_SERVICE_UNAVAILABLE;
3026 disc_reason = "NCP: no NCPs available";
3027 break;
3028 case 19: // ncp: failure to converge on acceptable address
3029 disc_cause = TERM_SERVICE_UNAVAILABLE;
3030 disc_reason = (dir == 1)
3031 ? "NCP: too many Configure-Naks received from peer"
3032 : "NCP: too many Configure-Naks sent to peer";
3033 break;
3034 case 20: // ncp: user not permitted to use any address
3035 disc_cause = TERM_SERVICE_UNAVAILABLE;
3036 disc_reason = (dir == 1)
3037 ? "NCP: local link address not acceptable to peer"
3038 : "NCP: remote link address not acceptable";
3039 break;
3040 }
3041 }
3042 break;
3043 default:
3044 {
3045 static char e[] = "unknown AVP 0xXXXX";
3046 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3047 fatal = flags;
3048 result = 2; // general error
3049 error = 8; // unknown mandatory AVP
3050 sprintf((msg = e) + 14, "%04x", mtype);
3051 continue; // next
3052 }
3053 }
3054 }
3055 // process message
3056 if (fatal & 0x80)
3057 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3058 else
3059 switch (message)
3060 {
3061 case 1: // SCCRQ - Start Control Connection Request
3062 tunnel[t].state = TUNNELOPENING;
3063 LOG(3, s, t, "Received SCCRQ\n");
3064 if (main_quit != QUIT_SHUTDOWN)
3065 {
3066 LOG(3, s, t, "sending SCCRP\n");
3067 controlt *c = controlnew(2); // sending SCCRP
3068 control16(c, 2, version, 1); // protocol version
3069 control32(c, 3, 3, 1); // framing
3070 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3071 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3072 control16(c, 9, t, 1); // assigned tunnel
3073 controladd(c, 0, t); // send the resply
3074 }
3075 else
3076 {
3077 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3078 }
3079 break;
3080 case 2: // SCCRP
3081 tunnel[t].state = TUNNELOPEN;
3082 tunnel[t].lastrec = time_now;
3083 LOG(3, s, t, "Received SCCRP\n");
3084 if (main_quit != QUIT_SHUTDOWN)
3085 {
3086 if (tunnel[t].isremotelns && recvchalresponse)
3087 {
3088 hasht hash;
3089
3090 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3091 // check authenticator
3092 if (memcmp(hash, recvchalresponse, 16) == 0)
3093 {
3094 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3095 controlt *c = controlnew(3); // sending SCCCN
3096 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3097 controls(c, 8, Vendor_name, 1); // Vendor name
3098 control16(c, 2, version, 1); // protocol version
3099 control32(c, 3, 3, 1); // framing Capabilities
3100 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3101 control16(c, 9, t, 1); // assigned tunnel
3102 controladd(c, 0, t); // send
3103 }
3104 else
3105 {
3106 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3107 }
3108 }
3109 }
3110 else
3111 {
3112 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3113 }
3114 break;
3115 case 3: // SCCN
3116 LOG(3, s, t, "Received SCCN\n");
3117 tunnel[t].state = TUNNELOPEN;
3118 tunnel[t].lastrec = time_now;
3119 controlnull(t); // ack
3120 break;
3121 case 4: // StopCCN
3122 LOG(3, s, t, "Received StopCCN\n");
3123 controlnull(t); // ack
3124 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3125 break;
3126 case 6: // HELLO
3127 LOG(3, s, t, "Received HELLO\n");
3128 controlnull(t); // simply ACK
3129 break;
3130 case 7: // OCRQ
3131 // TBA
3132 LOG(3, s, t, "Received OCRQ\n");
3133 break;
3134 case 8: // OCRO
3135 // TBA
3136 LOG(3, s, t, "Received OCRO\n");
3137 break;
3138 case 9: // OCCN
3139 // TBA
3140 LOG(3, s, t, "Received OCCN\n");
3141 break;
3142 case 10: // ICRQ
3143 LOG(3, s, t, "Received ICRQ\n");
3144 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3145 {
3146 controlt *c = controlnew(11); // ICRP
3147
3148 LOG(3, s, t, "Sending ICRP\n");
3149
3150 s = sessionfree;
3151 sessionfree = session[s].next;
3152 memset(&session[s], 0, sizeof(session[s]));
3153
3154 if (s > config->cluster_highest_sessionid)
3155 config->cluster_highest_sessionid = s;
3156
3157 session[s].opened = time_now;
3158 session[s].tunnel = t;
3159 session[s].far = asession;
3160 session[s].last_packet = session[s].last_data = time_now;
3161 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3162 control16(c, 14, s, 1); // assigned session
3163 controladd(c, asession, t); // send the reply
3164
3165 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3166 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3167
3168 session[s].ppp.phase = Establish;
3169 session[s].ppp.lcp = Starting;
3170
3171 STAT(session_created);
3172 break;
3173 }
3174
3175 {
3176 controlt *c = controlnew(14); // CDN
3177 LOG(3, s, t, "Sending CDN\n");
3178 if (!sessionfree)
3179 {
3180 STAT(session_overflow);
3181 LOG(1, 0, t, "No free sessions\n");
3182 control16(c, 1, 4, 0); // temporary lack of resources
3183 }
3184 else
3185 control16(c, 1, 2, 7); // shutting down, try another
3186
3187 controladd(c, asession, t); // send the message
3188 }
3189 return;
3190 case 11: // ICRP
3191 LOG(3, s, t, "Received ICRP\n");
3192 if (session[s].forwardtosession)
3193 {
3194 controlt *c = controlnew(12); // ICCN
3195
3196 session[s].opened = time_now;
3197 session[s].tunnel = t;
3198 session[s].far = asession;
3199 session[s].last_packet = session[s].last_data = time_now;
3200
3201 control32(c, 19, 1, 1); // Framing Type
3202 control32(c, 24, 10000000, 1); // Tx Connect Speed
3203 controladd(c, asession, t); // send the message
3204 LOG(3, s, t, "Sending ICCN\n");
3205 }
3206 break;
3207 case 12: // ICCN
3208 LOG(3, s, t, "Received ICCN\n");
3209 if (amagic == 0) amagic = time_now;
3210 session[s].magic = amagic; // set magic number
3211 session[s].flags = aflags; // set flags received
3212 session[s].mru = PPPoE_MRU; // default
3213 controlnull(t); // ack
3214
3215 // start LCP
3216 sess_local[s].lcp_authtype = config->radius_authprefer;
3217 sess_local[s].ppp_mru = MRU;
3218
3219 // Set multilink options before sending initial LCP packet
3220 sess_local[s].mp_mrru = 1614;
3221 sess_local[s].mp_epdis = ntohl(config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] : my_address);
3222
3223 sendlcp(s, t);
3224 change_state(s, lcp, RequestSent);
3225 break;
3226
3227 case 14: // CDN
3228 LOG(3, s, t, "Received CDN\n");
3229 controlnull(t); // ack
3230 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3231 break;
3232 case 0xFFFF:
3233 LOG(1, s, t, "Missing message type\n");
3234 break;
3235 default:
3236 STAT(tunnel_rx_errors);
3237 if (mandatory)
3238 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3239 else
3240 LOG(1, s, t, "Unknown message type %u\n", message);
3241 break;
3242 }
3243 if (sendchalresponse) free(sendchalresponse);
3244 if (recvchalresponse) free(recvchalresponse);
3245 cluster_send_tunnel(t);
3246 }
3247 else
3248 {
3249 LOG(4, s, t, " Got a ZLB ack\n");
3250 }
3251 }
3252 else
3253 { // data
3254 uint16_t proto;
3255
3256 LOG_HEX(5, "Receive Tunnel Data", p, l);
3257 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3258 { // HDLC address header, discard
3259 p += 2;
3260 l -= 2;
3261 }
3262 if (l < 2)
3263 {
3264 LOG(1, s, t, "Short ppp length %d\n", l);
3265 STAT(tunnel_rx_errors);
3266 return;
3267 }
3268 if (*p & 1)
3269 {
3270 proto = *p++;
3271 l--;
3272 }
3273 else
3274 {
3275 proto = ntohs(*(uint16_t *) p);
3276 p += 2;
3277 l -= 2;
3278 }
3279
3280 if (session[s].forwardtosession)
3281 {
3282 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3283 // Forward to LAC/BAS or Remote LNS session
3284 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3285 return;
3286 }
3287 else if (config->auth_tunnel_change_addr_src)
3288 {
3289 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3290 tunnel[t].port == ntohs(addr->sin_port))
3291 {
3292 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3293 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3294 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3295
3296 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3297 }
3298 }
3299
3300 if (s && !session[s].opened) // Is something wrong??
3301 {
3302 if (!config->cluster_iam_master)
3303 {
3304 // Pass it off to the master to deal with..
3305 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3306 return;
3307 }
3308
3309 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3310 STAT(tunnel_rx_errors);
3311 return;
3312 }
3313
3314 if (proto == PPPPAP)
3315 {
3316 session[s].last_packet = time_now;
3317 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3318 processpap(s, t, p, l);
3319 }
3320 else if (proto == PPPCHAP)
3321 {
3322 session[s].last_packet = time_now;
3323 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3324 processchap(s, t, p, l);
3325 }
3326 else if (proto == PPPLCP)
3327 {
3328 session[s].last_packet = time_now;
3329 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3330 processlcp(s, t, p, l);
3331 }
3332 else if (proto == PPPIPCP)
3333 {
3334 session[s].last_packet = time_now;
3335 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3336 processipcp(s, t, p, l);
3337 }
3338 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3339 {
3340 session[s].last_packet = time_now;
3341 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3342 processipv6cp(s, t, p, l);
3343 }
3344 else if (proto == PPPCCP)
3345 {
3346 session[s].last_packet = time_now;
3347 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3348 processccp(s, t, p, l);
3349 }
3350 else if (proto == PPPIP)
3351 {
3352 if (session[s].die)
3353 {
3354 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3355 return; // closing session, PPP not processed
3356 }
3357
3358 session[s].last_packet = session[s].last_data = time_now;
3359 if (session[s].walled_garden && !config->cluster_iam_master)
3360 {
3361 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3362 return;
3363 }
3364
3365 processipin(s, t, p, l);
3366 }
3367 else if (proto == PPPMP)
3368 {
3369 if (session[s].die)
3370 {
3371 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3372 return; // closing session, PPP not processed
3373 }
3374
3375 session[s].last_packet = session[s].last_data = time_now;
3376 if (!config->cluster_iam_master)
3377 {
3378 // The fragments reconstruction is managed by the Master.
3379 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3380 return;
3381 }
3382
3383 processmpin(s, t, p, l);
3384 }
3385 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3386 {
3387 if (session[s].die)
3388 {
3389 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3390 return; // closing session, PPP not processed
3391 }
3392
3393 session[s].last_packet = session[s].last_data = time_now;
3394 if (session[s].walled_garden && !config->cluster_iam_master)
3395 {
3396 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3397 return;
3398 }
3399
3400 processipv6in(s, t, p, l);
3401 }
3402 else if (session[s].ppp.lcp == Opened)
3403 {
3404 session[s].last_packet = time_now;
3405 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3406 protoreject(s, t, p, l, proto);
3407 }
3408 else
3409 {
3410 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3411 proto, ppp_state(session[s].ppp.lcp));
3412 }
3413 }
3414 }
3415
3416 // read and process packet on tun
3417 // (i.e. this routine writes to buf[-8]).
3418 static void processtun(uint8_t * buf, int len)
3419 {
3420 LOG_HEX(5, "Receive TUN Data", buf, len);
3421 STAT(tun_rx_packets);
3422 INC_STAT(tun_rx_bytes, len);
3423
3424 CSTAT(processtun);
3425
3426 eth_rx_pkt++;
3427 eth_rx += len;
3428 if (len < 22)
3429 {
3430 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3431 STAT(tun_rx_errors);
3432 return;
3433 }
3434
3435 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3436 processipout(buf, len);
3437 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3438 && config->ipv6_prefix.s6_addr[0])
3439 processipv6out(buf, len);
3440
3441 // Else discard.
3442 }
3443
3444 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3445 // that we look at the whole of the tunnel, radius and session tables
3446 // every second
3447 static void regular_cleanups(double period)
3448 {
3449 // Next tunnel, radius and session to check for actions on.
3450 static tunnelidt t = 0;
3451 static int r = 0;
3452 static sessionidt s = 0;
3453
3454 int t_actions = 0;
3455 int r_actions = 0;
3456 int s_actions = 0;
3457
3458 int t_slice;
3459 int r_slice;
3460 int s_slice;
3461
3462 int i;
3463 int a;
3464
3465 // divide up tables into slices based on the last run
3466 t_slice = config->cluster_highest_tunnelid * period;
3467 r_slice = (MAXRADIUS - 1) * period;
3468 s_slice = config->cluster_highest_sessionid * period;
3469
3470 if (t_slice < 1)
3471 t_slice = 1;
3472 else if (t_slice > config->cluster_highest_tunnelid)
3473 t_slice = config->cluster_highest_tunnelid;
3474
3475 if (r_slice < 1)
3476 r_slice = 1;
3477 else if (r_slice > (MAXRADIUS - 1))
3478 r_slice = MAXRADIUS - 1;
3479
3480 if (s_slice < 1)
3481 s_slice = 1;
3482 else if (s_slice > config->cluster_highest_sessionid)
3483 s_slice = config->cluster_highest_sessionid;
3484
3485 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3486
3487 for (i = 0; i < t_slice; i++)
3488 {
3489 t++;
3490 if (t > config->cluster_highest_tunnelid)
3491 t = 1;
3492
3493 if (t == TUNNEL_ID_PPPOE)
3494 continue;
3495
3496 // check for expired tunnels
3497 if (tunnel[t].die && tunnel[t].die <= TIME)
3498 {
3499 STAT(tunnel_timeout);
3500 tunnelkill(t, "Expired");
3501 t_actions++;
3502 continue;
3503 }
3504 // check for message resend
3505 if (tunnel[t].retry && tunnel[t].controlc)
3506 {
3507 // resend pending messages as timeout on reply
3508 if (tunnel[t].retry <= TIME)
3509 {
3510 controlt *c = tunnel[t].controls;
3511 uint16_t w = tunnel[t].window;
3512 tunnel[t].try++; // another try
3513 if (tunnel[t].try > 5)
3514 tunnelkill(t, "Timeout on control message"); // game over
3515 else
3516 while (c && w--)
3517 {
3518 tunnelsend(c->buf, c->length, t);
3519 c = c->next;
3520 }
3521
3522 t_actions++;
3523 }
3524 }
3525 // Send hello
3526 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3527 {
3528 if (!config->disable_sending_hello)
3529 {
3530 controlt *c = controlnew(6); // sending HELLO
3531 controladd(c, 0, t); // send the message
3532 LOG(3, 0, t, "Sending HELLO message\n");
3533 t_actions++;
3534 }
3535 }
3536
3537 // Check for tunnel changes requested from the CLI
3538 if ((a = cli_tunnel_actions[t].action))
3539 {
3540 cli_tunnel_actions[t].action = 0;
3541 if (a & CLI_TUN_KILL)
3542 {
3543 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3544 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3545 t_actions++;
3546 }
3547 }
3548 }
3549
3550 for (i = 0; i < r_slice; i++)
3551 {
3552 r++;
3553 if (r >= MAXRADIUS)
3554 r = 1;
3555
3556 if (!radius[r].state)
3557 continue;
3558
3559 if (radius[r].retry <= TIME)
3560 {
3561 radiusretry(r);
3562 r_actions++;
3563 }
3564 }
3565
3566 for (i = 0; i < s_slice; i++)
3567 {
3568 s++;
3569 if (s > config->cluster_highest_sessionid)
3570 s = 1;
3571
3572 if (!session[s].opened) // Session isn't in use
3573 continue;
3574
3575 // check for expired sessions
3576 if (session[s].die)
3577 {
3578 if (session[s].die <= TIME)
3579 {
3580 sessionkill(s, "Expired");
3581 s_actions++;
3582 }
3583 continue;
3584 }
3585
3586 // PPP timeouts
3587 if (sess_local[s].lcp.restart <= time_now)
3588 {
3589 int next_state = session[s].ppp.lcp;
3590 switch (session[s].ppp.lcp)
3591 {
3592 case RequestSent:
3593 case AckReceived:
3594 next_state = RequestSent;
3595
3596 case AckSent:
3597 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3598 {
3599 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3600 sendlcp(s, session[s].tunnel);
3601 change_state(s, lcp, next_state);
3602 }
3603 else
3604 {
3605 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3606 STAT(session_timeout);
3607 }
3608
3609 s_actions++;
3610 }
3611
3612 if (session[s].die)
3613 continue;
3614 }
3615
3616 if (sess_local[s].ipcp.restart <= time_now)
3617 {
3618 int next_state = session[s].ppp.ipcp;
3619 switch (session[s].ppp.ipcp)
3620 {
3621 case RequestSent:
3622 case AckReceived:
3623 next_state = RequestSent;
3624
3625 case AckSent:
3626 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3627 {
3628 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3629 sendipcp(s, session[s].tunnel);
3630 change_state(s, ipcp, next_state);
3631 }
3632 else
3633 {
3634 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3635 STAT(session_timeout);
3636 }
3637
3638 s_actions++;
3639 }
3640
3641 if (session[s].die)
3642 continue;
3643 }
3644
3645 if (sess_local[s].ipv6cp.restart <= time_now)
3646 {
3647 int next_state = session[s].ppp.ipv6cp;
3648 switch (session[s].ppp.ipv6cp)
3649 {
3650 case RequestSent:
3651 case AckReceived:
3652 next_state = RequestSent;
3653
3654 case AckSent:
3655 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3656 {
3657 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3658 sendipv6cp(s, session[s].tunnel);
3659 change_state(s, ipv6cp, next_state);
3660 }
3661 else
3662 {
3663 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3664 change_state(s, ipv6cp, Stopped);
3665 }
3666
3667 s_actions++;
3668 }
3669 }
3670
3671 if (sess_local[s].ccp.restart <= time_now)
3672 {
3673 int next_state = session[s].ppp.ccp;
3674 switch (session[s].ppp.ccp)
3675 {
3676 case RequestSent:
3677 case AckReceived:
3678 next_state = RequestSent;
3679
3680 case AckSent:
3681 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3682 {
3683 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3684 sendccp(s, session[s].tunnel);
3685 change_state(s, ccp, next_state);
3686 }
3687 else
3688 {
3689 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3690 change_state(s, ccp, Stopped);
3691 }
3692
3693 s_actions++;
3694 }
3695 }
3696
3697 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3698 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3699 {
3700 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3701 STAT(session_timeout);
3702 s_actions++;
3703 continue;
3704 }
3705
3706 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3707 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3708 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3709 {
3710 uint8_t b[MAXETHER];
3711
3712 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3713 if (!q) continue;
3714
3715 *q = EchoReq;
3716 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3717 *(uint16_t *)(q + 2) = htons(8); // Length
3718 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3719
3720 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3721 (int)(time_now - session[s].last_packet));
3722
3723 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3724 sess_local[s].last_echo = time_now;
3725 s_actions++;
3726 }
3727
3728 // Drop sessions who have reached session_timeout seconds
3729 if (session[s].session_timeout)
3730 {
3731 bundleidt bid = session[s].bundle;
3732 if (bid)
3733 {
3734 if (time_now - bundle[bid].last_check >= 1)
3735 {
3736 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3737 bundle[bid].last_check = time_now;
3738 if (bundle[bid].online_time >= session[s].session_timeout)
3739 {
3740 int ses;
3741 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3742 {
3743 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3744 s_actions++;
3745 continue;
3746 }
3747 }
3748 }
3749 }
3750 else if (time_now - session[s].opened >= session[s].session_timeout)
3751 {
3752 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3753 s_actions++;
3754 continue;
3755 }
3756 }
3757
3758 // Drop sessions who have reached idle_timeout seconds
3759 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3760 {
3761 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3762 STAT(session_timeout);
3763 s_actions++;
3764 continue;
3765 }
3766
3767 // Check for actions requested from the CLI
3768 if ((a = cli_session_actions[s].action))
3769 {
3770 int send = 0;
3771
3772 cli_session_actions[s].action = 0;
3773 if (a & CLI_SESS_KILL)
3774 {
3775 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3776 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3777 a = 0; // dead, no need to check for other actions
3778 s_actions++;
3779 }
3780
3781 if (a & CLI_SESS_NOSNOOP)
3782 {
3783 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3784 session[s].snoop_ip = 0;
3785 session[s].snoop_port = 0;
3786 s_actions++;
3787 send++;
3788 }
3789 else if (a & CLI_SESS_SNOOP)
3790 {
3791 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3792 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3793 cli_session_actions[s].snoop_port);
3794
3795 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3796 session[s].snoop_port = cli_session_actions[s].snoop_port;
3797 s_actions++;
3798 send++;
3799 }
3800
3801 if (a & CLI_SESS_NOTHROTTLE)
3802 {
3803 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3804 throttle_session(s, 0, 0);
3805 s_actions++;
3806 send++;
3807 }
3808 else if (a & CLI_SESS_THROTTLE)
3809 {
3810 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3811 cli_session_actions[s].throttle_in,
3812 cli_session_actions[s].throttle_out);
3813
3814 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3815 s_actions++;
3816 send++;
3817 }
3818
3819 if (a & CLI_SESS_NOFILTER)
3820 {
3821 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3822 filter_session(s, 0, 0);
3823 s_actions++;
3824 send++;
3825 }
3826 else if (a & CLI_SESS_FILTER)
3827 {
3828 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3829 cli_session_actions[s].filter_in,
3830 cli_session_actions[s].filter_out);
3831
3832 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3833 s_actions++;
3834 send++;
3835 }
3836
3837 if (send)
3838 cluster_send_session(s);
3839 }
3840
3841 // RADIUS interim accounting
3842 if (config->radius_accounting && config->radius_interim > 0
3843 && session[s].ip && !session[s].walled_garden
3844 && !sess_local[s].radius // RADIUS already in progress
3845 && time_now - sess_local[s].last_interim >= config->radius_interim
3846 && session[s].flags & SESSION_STARTED)
3847 {
3848 int rad = radiusnew(s);
3849 if (!rad)
3850 {
3851 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3852 STAT(radius_overflow);
3853 continue;
3854 }
3855
3856 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3857 session[s].user, session[s].unique_id);
3858
3859 radiussend(rad, RADIUSINTERIM);
3860 sess_local[s].last_interim = time_now;
3861 s_actions++;
3862 }
3863 }
3864
3865 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3866 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3867 }
3868
3869 //
3870 // Are we in the middle of a tunnel update, or radius
3871 // requests??
3872 //
3873 static int still_busy(void)
3874 {
3875 int i;
3876 static clockt last_talked = 0;
3877 static clockt start_busy_wait = 0;
3878
3879 #ifdef BGP
3880 static time_t stopped_bgp = 0;
3881 if (bgp_configured)
3882 {
3883 if (!stopped_bgp)
3884 {
3885 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3886
3887 for (i = 0; i < BGP_NUM_PEERS; i++)
3888 if (bgp_peers[i].state == Established)
3889 bgp_stop(&bgp_peers[i]);
3890
3891 stopped_bgp = time_now;
3892
3893 if (!config->cluster_iam_master)
3894 {
3895 // we don't want to become master
3896 cluster_send_ping(0);
3897
3898 return 1;
3899 }
3900 }
3901
3902 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3903 return 1;
3904 }
3905 #endif /* BGP */
3906
3907 if (!config->cluster_iam_master)
3908 return 0;
3909
3910 if (main_quit == QUIT_SHUTDOWN)
3911 {
3912 static int dropped = 0;
3913 if (!dropped)
3914 {
3915 int i;
3916
3917 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3918 for (i = 1; i < MAXTUNNEL; i++)
3919 if (tunnel[i].ip || tunnel[i].state)
3920 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3921
3922 dropped = 1;
3923 }
3924 }
3925
3926 if (start_busy_wait == 0)
3927 start_busy_wait = TIME;
3928
3929 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3930 {
3931 if (!tunnel[i].controlc)
3932 continue;
3933
3934 if (last_talked != TIME)
3935 {
3936 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3937 last_talked = TIME;
3938 }
3939 return 1;
3940 }
3941
3942 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3943 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3944 {
3945 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3946 return 0;
3947 }
3948
3949 for (i = 1; i < MAXRADIUS; i++)
3950 {
3951 if (radius[i].state == RADIUSNULL)
3952 continue;
3953 if (radius[i].state == RADIUSWAIT)
3954 continue;
3955
3956 if (last_talked != TIME)
3957 {
3958 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3959 last_talked = TIME;
3960 }
3961 return 1;
3962 }
3963
3964 return 0;
3965 }
3966
3967 #ifdef HAVE_EPOLL
3968 # include <sys/epoll.h>
3969 #else
3970 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3971 # include "fake_epoll.h"
3972 #endif
3973
3974 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
3975 #define BASE_FDS (9 + MAX_UDPFD)
3976
3977 // additional polled fds
3978 #ifdef BGP
3979 # define EXTRA_FDS BGP_NUM_PEERS
3980 #else
3981 # define EXTRA_FDS 0
3982 #endif
3983
3984 // main loop - gets packets on tun or udp and processes them
3985 static void mainloop(void)
3986 {
3987 int i, j;
3988 uint8_t buf[65536];
3989 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3990 // and the forwarded pppoe session
3991 int size_bufp = sizeof(buf) - 32;
3992 clockt next_cluster_ping = 0; // send initial ping immediately
3993 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3994 int maxevent = sizeof(events)/sizeof(*events);
3995
3996 if ((epollfd = epoll_create(maxevent)) < 0)
3997 {
3998 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3999 exit(1);
4000 }
4001
4002 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",
4003 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4004
4005 /* setup our fds to poll for input */
4006 {
4007 static struct event_data d[BASE_FDS];
4008 struct epoll_event e;
4009
4010 e.events = EPOLLIN;
4011 i = 0;
4012
4013 if (clifd >= 0)
4014 {
4015 d[i].type = FD_TYPE_CLI;
4016 e.data.ptr = &d[i++];
4017 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4018 }
4019
4020 d[i].type = FD_TYPE_CLUSTER;
4021 e.data.ptr = &d[i++];
4022 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4023
4024 d[i].type = FD_TYPE_TUN;
4025 e.data.ptr = &d[i++];
4026 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4027
4028 d[i].type = FD_TYPE_CONTROL;
4029 e.data.ptr = &d[i++];
4030 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4031
4032 d[i].type = FD_TYPE_DAE;
4033 e.data.ptr = &d[i++];
4034 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4035
4036 d[i].type = FD_TYPE_NETLINK;
4037 e.data.ptr = &d[i++];
4038 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4039
4040 d[i].type = FD_TYPE_PPPOEDISC;
4041 e.data.ptr = &d[i++];
4042 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4043
4044 d[i].type = FD_TYPE_PPPOESESS;
4045 e.data.ptr = &d[i++];
4046 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4047
4048 for (j = 0; j < config->nbudpfd; j++)
4049 {
4050 d[i].type = FD_TYPE_UDP;
4051 d[i].index = j;
4052 e.data.ptr = &d[i++];
4053 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4054 }
4055 }
4056
4057 #ifdef BGP
4058 signal(SIGPIPE, SIG_IGN);
4059 bgp_setup(config->as_number);
4060 if (config->bind_address)
4061 bgp_add_route(config->bind_address, 0xffffffff);
4062
4063 for (i = 0; i < BGP_NUM_PEERS; i++)
4064 {
4065 if (config->neighbour[i].name[0])
4066 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4067 config->neighbour[i].as, config->neighbour[i].keepalive,
4068 config->neighbour[i].hold, config->neighbour[i].update_source,
4069 0); /* 0 = routing disabled */
4070 }
4071 #endif /* BGP */
4072
4073 while (!main_quit || still_busy())
4074 {
4075 int more = 0;
4076 int n;
4077
4078
4079 if (main_reload)
4080 {
4081 main_reload = 0;
4082 read_config_file();
4083 config->reload_config++;
4084 }
4085
4086 if (config->reload_config)
4087 {
4088 config->reload_config = 0;
4089 update_config();
4090 }
4091
4092 #ifdef BGP
4093 bgp_set_poll();
4094 #endif /* BGP */
4095
4096 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4097 STAT(select_called);
4098
4099 TIME = now(NULL);
4100 if (n < 0)
4101 {
4102 if (errno == EINTR ||
4103 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4104 continue;
4105
4106 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4107 break; // exit
4108 }
4109
4110 if (n)
4111 {
4112 struct sockaddr_in addr;
4113 struct in_addr local;
4114 socklen_t alen;
4115 int c, s;
4116 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4117 int pppoesess_ready = 0;
4118 int pppoesess_pkts = 0;
4119 int tun_ready = 0;
4120 int cluster_ready = 0;
4121 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4122 int tun_pkts = 0;
4123 int cluster_pkts = 0;
4124 #ifdef BGP
4125 uint32_t bgp_events[BGP_NUM_PEERS];
4126 memset(bgp_events, 0, sizeof(bgp_events));
4127 #endif /* BGP */
4128
4129 for (c = n, i = 0; i < c; i++)
4130 {
4131 struct event_data *d = events[i].data.ptr;
4132
4133 switch (d->type)
4134 {
4135 case FD_TYPE_CLI: // CLI connections
4136 {
4137 int cli;
4138
4139 alen = sizeof(addr);
4140 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4141 {
4142 cli_do(cli);
4143 close(cli);
4144 }
4145 else
4146 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4147
4148 n--;
4149 break;
4150 }
4151
4152 // these are handled below, with multiple interleaved reads
4153 case FD_TYPE_CLUSTER: cluster_ready++; break;
4154 case FD_TYPE_TUN: tun_ready++; break;
4155 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4156 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4157
4158 case FD_TYPE_PPPOEDISC: // pppoe discovery
4159 s = read(pppoediscfd, p, size_bufp);
4160 if (s > 0) process_pppoe_disc(p, s);
4161 n--;
4162 break;
4163
4164 case FD_TYPE_CONTROL: // nsctl commands
4165 alen = sizeof(addr);
4166 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4167 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4168 n--;
4169 break;
4170
4171 case FD_TYPE_DAE: // DAE requests
4172 alen = sizeof(addr);
4173 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4174 if (s > 0) processdae(p, s, &addr, alen, &local);
4175 n--;
4176 break;
4177
4178 case FD_TYPE_RADIUS: // RADIUS response
4179 alen = sizeof(addr);
4180 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4181 if (s >= 0 && config->cluster_iam_master)
4182 {
4183 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4184 addr.sin_addr.s_addr == config->radiusserver[1])
4185 processrad(p, s, d->index);
4186 else
4187 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4188 fmtaddr(addr.sin_addr.s_addr, 0));
4189 }
4190
4191 n--;
4192 break;
4193
4194 #ifdef BGP
4195 case FD_TYPE_BGP:
4196 bgp_events[d->index] = events[i].events;
4197 n--;
4198 break;
4199 #endif /* BGP */
4200
4201 case FD_TYPE_NETLINK:
4202 {
4203 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4204 s = netlink_recv(p, size_bufp);
4205 if (nh->nlmsg_type == NLMSG_ERROR)
4206 {
4207 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4208 if (errmsg->error)
4209 {
4210 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4211 {
4212 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4213 exit(1);
4214 }
4215 else
4216 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4217 }
4218 // else it's a ack
4219 }
4220 else
4221 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);
4222 n--;
4223 break;
4224 }
4225
4226 default:
4227 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4228 }
4229 }
4230
4231 #ifdef BGP
4232 bgp_process(bgp_events);
4233 #endif /* BGP */
4234
4235 for (c = 0; n && c < config->multi_read_count; c++)
4236 {
4237 for (j = 0; j < config->nbudpfd; j++)
4238 {
4239 // L2TP and L2TP REMOTE LNS
4240 if (udp_ready[j])
4241 {
4242 alen = sizeof(addr);
4243 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4244 {
4245 processudp(p, s, &addr, j);
4246 udp_pkts[j]++;
4247 }
4248 else
4249 {
4250 udp_ready[j] = 0;
4251 n--;
4252 }
4253 }
4254 }
4255
4256 // incoming IP
4257 if (tun_ready)
4258 {
4259 if ((s = read(tunfd, p, size_bufp)) > 0)
4260 {
4261 processtun(p, s);
4262 tun_pkts++;
4263 }
4264 else
4265 {
4266 tun_ready = 0;
4267 n--;
4268 }
4269 }
4270
4271 // pppoe session
4272 if (pppoesess_ready)
4273 {
4274 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4275 {
4276 process_pppoe_sess(p, s);
4277 pppoesess_pkts++;
4278 }
4279 else
4280 {
4281 pppoesess_ready = 0;
4282 n--;
4283 }
4284 }
4285
4286 // cluster
4287 if (cluster_ready)
4288 {
4289 alen = sizeof(addr);
4290 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4291 {
4292 processcluster(p, s, addr.sin_addr.s_addr);
4293 cluster_pkts++;
4294 }
4295 else
4296 {
4297 cluster_ready = 0;
4298 n--;
4299 }
4300 }
4301 }
4302
4303 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4304 STAT(multi_read_used);
4305
4306 if (c >= config->multi_read_count)
4307 {
4308 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4309 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4310 STAT(multi_read_exceeded);
4311 more++;
4312 }
4313 }
4314 #ifdef BGP
4315 else
4316 /* no event received, but timers could still have expired */
4317 bgp_process_peers_timers();
4318 #endif /* BGP */
4319
4320 if (time_changed)
4321 {
4322 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4323
4324 // Log current traffic stats
4325 snprintf(config->bandwidth, sizeof(config->bandwidth),
4326 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4327 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4328 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4329 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4330
4331 udp_tx = udp_rx = 0;
4332 udp_rx_pkt = eth_rx_pkt = 0;
4333 eth_tx = eth_rx = 0;
4334 time_changed = 0;
4335
4336 if (config->dump_speed)
4337 printf("%s\n", config->bandwidth);
4338
4339 // Update the internal time counter
4340 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4341
4342 {
4343 // Run timer hooks
4344 struct param_timer p = { time_now };
4345 run_plugins(PLUGIN_TIMER, &p);
4346 }
4347 }
4348
4349 // Runs on every machine (master and slaves).
4350 if (next_cluster_ping <= TIME)
4351 {
4352 // Check to see which of the cluster is still alive..
4353
4354 cluster_send_ping(basetime); // Only does anything if we're a slave
4355 cluster_check_master(); // ditto.
4356
4357 cluster_heartbeat(); // Only does anything if we're a master.
4358 cluster_check_slaves(); // ditto.
4359
4360 master_update_counts(); // If we're a slave, send our byte counters to our master.
4361
4362 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4363 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4364 else
4365 next_cluster_ping = TIME + config->cluster_hb_interval;
4366 }
4367
4368 if (!config->cluster_iam_master)
4369 continue;
4370
4371 // Run token bucket filtering queue..
4372 // Only run it every 1/10th of a second.
4373 {
4374 static clockt last_run = 0;
4375 if (last_run != TIME)
4376 {
4377 last_run = TIME;
4378 tbf_run_timer();
4379 }
4380 }
4381
4382 // Handle timeouts, retries etc.
4383 {
4384 static double last_clean = 0;
4385 double this_clean;
4386 double diff;
4387
4388 TIME = now(&this_clean);
4389 diff = this_clean - last_clean;
4390
4391 // Run during idle time (after we've handled
4392 // all incoming packets) or every 1/10th sec
4393 if (!more || diff > 0.1)
4394 {
4395 regular_cleanups(diff);
4396 last_clean = this_clean;
4397 }
4398 }
4399
4400 if (*config->accounting_dir)
4401 {
4402 static clockt next_acct = 0;
4403 static clockt next_shut_acct = 0;
4404
4405 if (next_acct <= TIME)
4406 {
4407 // Dump accounting data
4408 next_acct = TIME + ACCT_TIME;
4409 next_shut_acct = TIME + ACCT_SHUT_TIME;
4410 dump_acct_info(1);
4411 }
4412 else if (next_shut_acct <= TIME)
4413 {
4414 // Dump accounting data for shutdown sessions
4415 next_shut_acct = TIME + ACCT_SHUT_TIME;
4416 if (shut_acct_n)
4417 dump_acct_info(0);
4418 }
4419 }
4420 }
4421
4422 // Are we the master and shutting down??
4423 if (config->cluster_iam_master)
4424 cluster_heartbeat(); // Flush any queued changes..
4425
4426 // Ok. Notify everyone we're shutting down. If we're
4427 // the master, this will force an election.
4428 cluster_send_ping(0);
4429
4430 //
4431 // Important!!! We MUST not process any packets past this point!
4432 LOG(1, 0, 0, "Shutdown complete\n");
4433 }
4434
4435 static void stripdomain(char *host)
4436 {
4437 char *p;
4438
4439 if ((p = strchr(host, '.')))
4440 {
4441 char *domain = 0;
4442 char _domain[1024];
4443
4444 // strip off domain
4445 FILE *resolv = fopen("/etc/resolv.conf", "r");
4446 if (resolv)
4447 {
4448 char buf[1024];
4449 char *b;
4450
4451 while (fgets(buf, sizeof(buf), resolv))
4452 {
4453 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4454 continue;
4455
4456 if (!isspace(buf[6]))
4457 continue;
4458
4459 b = buf + 7;
4460 while (isspace(*b)) b++;
4461
4462 if (*b)
4463 {
4464 char *d = b;
4465 while (*b && !isspace(*b)) b++;
4466 *b = 0;
4467 if (buf[0] == 'd') // domain is canonical
4468 {
4469 domain = d;
4470 break;
4471 }
4472
4473 // first search line
4474 if (!domain)
4475 {
4476 // hold, may be subsequent domain line
4477 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4478 domain = _domain;
4479 }
4480 }
4481 }
4482
4483 fclose(resolv);
4484 }
4485
4486 if (domain)
4487 {
4488 int hl = strlen(host);
4489 int dl = strlen(domain);
4490 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4491 host[hl -dl - 1] = 0;
4492 }
4493 else
4494 {
4495 *p = 0; // everything after first dot
4496 }
4497 }
4498 }
4499
4500 // Init data structures
4501 static void initdata(int optdebug, char *optconfig)
4502 {
4503 int i;
4504
4505 if (!(config = shared_malloc(sizeof(configt))))
4506 {
4507 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4508 exit(1);
4509 }
4510
4511 memset(config, 0, sizeof(configt));
4512 time(&config->start_time);
4513 strncpy(config->config_file, optconfig, strlen(optconfig));
4514 config->debug = optdebug;
4515 config->num_tbfs = MAXTBFS;
4516 config->rl_rate = 28; // 28kbps
4517 config->cluster_mcast_ttl = 1;
4518 config->cluster_master_min_adv = 1;
4519 config->ppp_restart_time = 3;
4520 config->ppp_max_configure = 10;
4521 config->ppp_max_failure = 5;
4522 config->kill_timedout_sessions = 1;
4523 strcpy(config->random_device, RANDOMDEVICE);
4524 // Set default value echo_timeout and idle_echo_timeout
4525 config->echo_timeout = ECHO_TIMEOUT;
4526 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4527
4528 log_stream = stderr;
4529
4530 #ifdef RINGBUFFER
4531 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4532 {
4533 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4534 exit(1);
4535 }
4536 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4537 #endif
4538
4539 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4540 {
4541 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4542 exit(1);
4543 }
4544 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4545 {
4546 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4547 exit(1);
4548 }
4549 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4550 {
4551 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4552 exit(1);
4553 }
4554 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4555 {
4556 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4557 exit(1);
4558 }
4559 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4560 {
4561 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4562 exit(1);
4563 }
4564
4565 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4566 {
4567 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4568 exit(1);
4569 }
4570
4571 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4572 {
4573 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4574 exit(1);
4575 }
4576
4577 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4578 {
4579 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4580 exit(1);
4581 }
4582
4583 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4584 {
4585 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4586 exit(1);
4587 }
4588 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4589
4590 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4591 {
4592 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4593 exit(1);
4594 }
4595 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4596
4597 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4598 {
4599 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4600 exit(1);
4601 }
4602 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4603
4604 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4605 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4606 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4607 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4608 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4609
4610 // Put all the sessions on the free list marked as undefined.
4611 for (i = 1; i < MAXSESSION; i++)
4612 {
4613 session[i].next = i + 1;
4614 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4615 }
4616 session[MAXSESSION - 1].next = 0;
4617 sessionfree = 1;
4618
4619 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4620 for (i = 1; i < MAXTUNNEL; i++)
4621 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4622
4623 for (i = 1; i < MAXBUNDLE; i++) {
4624 bundle[i].state = BUNDLEUNDEF;
4625 }
4626
4627 if (!*hostname)
4628 {
4629 // Grab my hostname unless it's been specified
4630 gethostname(hostname, sizeof(hostname));
4631 stripdomain(hostname);
4632 }
4633
4634 _statistics->start_time = _statistics->last_reset = time(NULL);
4635
4636 #ifdef BGP
4637 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4638 {
4639 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4640 exit(1);
4641 }
4642 #endif /* BGP */
4643
4644 lac_initremotelnsdata();
4645 }
4646
4647 static int assign_ip_address(sessionidt s)
4648 {
4649 uint32_t i;
4650 int best = -1;
4651 time_t best_time = time_now;
4652 char *u = session[s].user;
4653 char reuse = 0;
4654
4655
4656 CSTAT(assign_ip_address);
4657
4658 for (i = 1; i < ip_pool_size; i++)
4659 {
4660 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4661 continue;
4662
4663 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4664 {
4665 best = i;
4666 reuse = 1;
4667 break;
4668 }
4669
4670 if (ip_address_pool[i].last < best_time)
4671 {
4672 best = i;
4673 if (!(best_time = ip_address_pool[i].last))
4674 break; // never used, grab this one
4675 }
4676 }
4677
4678 if (best < 0)
4679 {
4680 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4681 return 0;
4682 }
4683
4684 session[s].ip = ip_address_pool[best].address;
4685 session[s].ip_pool_index = best;
4686 ip_address_pool[best].assigned = 1;
4687 ip_address_pool[best].last = time_now;
4688 ip_address_pool[best].session = s;
4689 if (session[s].walled_garden)
4690 /* Don't track addresses of users in walled garden (note: this
4691 means that their address isn't "sticky" even if they get
4692 un-gardened). */
4693 ip_address_pool[best].user[0] = 0;
4694 else
4695 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4696
4697 STAT(ip_allocated);
4698 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4699 reuse ? "Reusing" : "Allocating", best);
4700
4701 return 1;
4702 }
4703
4704 static void free_ip_address(sessionidt s)
4705 {
4706 int i = session[s].ip_pool_index;
4707
4708
4709 CSTAT(free_ip_address);
4710
4711 if (!session[s].ip)
4712 return; // what the?
4713
4714 if (i < 0) // Is this actually part of the ip pool?
4715 i = 0;
4716
4717 STAT(ip_freed);
4718 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4719 session[s].ip = 0;
4720 ip_address_pool[i].assigned = 0;
4721 ip_address_pool[i].session = 0;
4722 ip_address_pool[i].last = time_now;
4723 }
4724
4725 //
4726 // Fsck the address pool against the session table.
4727 // Normally only called when we become a master.
4728 //
4729 // This isn't perfect: We aren't keep tracking of which
4730 // users used to have an IP address.
4731 //
4732 void rebuild_address_pool(void)
4733 {
4734 int i;
4735
4736 //
4737 // Zero the IP pool allocation, and build
4738 // a map from IP address to pool index.
4739 for (i = 1; i < MAXIPPOOL; ++i)
4740 {
4741 ip_address_pool[i].assigned = 0;
4742 ip_address_pool[i].session = 0;
4743 if (!ip_address_pool[i].address)
4744 continue;
4745
4746 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4747 }
4748
4749 for (i = 0; i < MAXSESSION; ++i)
4750 {
4751 int ipid;
4752 if (!(session[i].opened && session[i].ip))
4753 continue;
4754
4755 ipid = - lookup_ipmap(htonl(session[i].ip));
4756
4757 if (session[i].ip_pool_index < 0)
4758 {
4759 // Not allocated out of the pool.
4760 if (ipid < 1) // Not found in the pool either? good.
4761 continue;
4762
4763 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4764 i, fmtaddr(session[i].ip, 0), ipid);
4765
4766 // Fall through and process it as part of the pool.
4767 }
4768
4769
4770 if (ipid > MAXIPPOOL || ipid < 0)
4771 {
4772 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4773 ipid = -1;
4774 session[i].ip_pool_index = ipid;
4775 continue;
4776 }
4777
4778 ip_address_pool[ipid].assigned = 1;
4779 ip_address_pool[ipid].session = i;
4780 ip_address_pool[ipid].last = time_now;
4781 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4782 session[i].ip_pool_index = ipid;
4783 cache_ipmap(session[i].ip, i); // Fix the ip map.
4784 }
4785 }
4786
4787 //
4788 // Fix the address pool to match a changed session.
4789 // (usually when the master sends us an update).
4790 static void fix_address_pool(int sid)
4791 {
4792 int ipid;
4793
4794 ipid = session[sid].ip_pool_index;
4795
4796 if (ipid > ip_pool_size)
4797 return; // Ignore it. rebuild_address_pool will fix it up.
4798
4799 if (ip_address_pool[ipid].address != session[sid].ip)
4800 return; // Just ignore it. rebuild_address_pool will take care of it.
4801
4802 ip_address_pool[ipid].assigned = 1;
4803 ip_address_pool[ipid].session = sid;
4804 ip_address_pool[ipid].last = time_now;
4805 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4806 }
4807
4808 //
4809 // Add a block of addresses to the IP pool to hand out.
4810 //
4811 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4812 {
4813 int i;
4814 if (prefixlen == 0)
4815 prefixlen = 32; // Host route only.
4816
4817 addr &= 0xffffffff << (32 - prefixlen);
4818
4819 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4820 return ;
4821
4822 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4823 {
4824 if ((i & 0xff) == 0 || (i&0xff) == 255)
4825 continue; // Skip 0 and broadcast addresses.
4826
4827 ip_address_pool[ip_pool_size].address = i;
4828 ip_address_pool[ip_pool_size].assigned = 0;
4829 ++ip_pool_size;
4830 if (ip_pool_size >= MAXIPPOOL)
4831 {
4832 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4833 return;
4834 }
4835 }
4836 }
4837
4838 // Initialize the IP address pool
4839 static void initippool()
4840 {
4841 FILE *f;
4842 char *p;
4843 char buf[4096];
4844 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4845
4846 if (!(f = fopen(IPPOOLFILE, "r")))
4847 {
4848 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4849 exit(1);
4850 }
4851
4852 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4853 {
4854 char *pool = buf;
4855 buf[4095] = 0; // Force it to be zero terminated/
4856
4857 if (*buf == '#' || *buf == '\n')
4858 continue; // Skip comments / blank lines
4859 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4860 if ((p = (char *)strchr(buf, ':')))
4861 {
4862 in_addr_t src;
4863 *p = '\0';
4864 src = inet_addr(buf);
4865 if (src == INADDR_NONE)
4866 {
4867 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4868 exit(1);
4869 }
4870 // This entry is for a specific IP only
4871 if (src != config->bind_address)
4872 continue;
4873 *p = ':';
4874 pool = p+1;
4875 }
4876 if ((p = (char *)strchr(pool, '/')))
4877 {
4878 // It's a range
4879 int numbits = 0;
4880 in_addr_t start = 0;
4881
4882 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4883 *p++ = 0;
4884 if (!*p || !(numbits = atoi(p)))
4885 {
4886 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4887 continue;
4888 }
4889 start = ntohl(inet_addr(pool));
4890
4891 // Add a static route for this pool
4892 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4893 fmtaddr(htonl(start), 0), numbits);
4894
4895 routeset(0, start, numbits, 0, 1);
4896
4897 add_to_ip_pool(start, numbits);
4898 }
4899 else
4900 {
4901 // It's a single ip address
4902 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4903 }
4904 }
4905 fclose(f);
4906 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4907 }
4908
4909 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4910 {
4911 struct sockaddr_in snoop_addr = {0};
4912 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4913 return;
4914
4915 snoop_addr.sin_family = AF_INET;
4916 snoop_addr.sin_addr.s_addr = destination;
4917 snoop_addr.sin_port = ntohs(port);
4918
4919 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4920 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4921 htons(snoop_addr.sin_port));
4922
4923 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4924 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4925
4926 STAT(packets_snooped);
4927 }
4928
4929 static int dump_session(FILE **f, sessiont *s)
4930 {
4931 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4932 return 1;
4933
4934 if (!*f)
4935 {
4936 char filename[1024];
4937 char timestr[64];
4938 time_t now = time(NULL);
4939
4940 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4941 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4942
4943 if (!(*f = fopen(filename, "w")))
4944 {
4945 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4946 return 0;
4947 }
4948
4949 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4950 if(config->account_all_origin)
4951 {
4952 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4953 "# host: %s\n"
4954 "# endpoint: %s\n"
4955 "# time: %ld\n"
4956 "# uptime: %ld\n"
4957 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
4958 hostname,
4959 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4960 now,
4961 now - basetime);
4962 }
4963 else
4964 {
4965 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4966 "# host: %s\n"
4967 "# endpoint: %s\n"
4968 "# time: %ld\n"
4969 "# uptime: %ld\n"
4970 "# format: username ip qos uptxoctets downrxoctets\n",
4971 hostname,
4972 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4973 now,
4974 now - basetime);
4975 }
4976 }
4977
4978 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4979 if(config->account_all_origin)
4980 {
4981 fprintf(*f, "%s %s %d %u %u %s\n",
4982 s->user, // username
4983 fmtaddr(htonl(s->ip), 0), // ip
4984 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4985 (uint32_t) s->cin_delta, // uptxoctets
4986 (uint32_t) s->cout_delta, // downrxoctets
4987 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
4988 }
4989 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
4990 {
4991 fprintf(*f, "%s %s %d %u %u\n",
4992 s->user, // username
4993 fmtaddr(htonl(s->ip), 0), // ip
4994 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4995 (uint32_t) s->cin_delta, // uptxoctets
4996 (uint32_t) s->cout_delta); // downrxoctets
4997 }
4998
4999 s->cin_delta = s->cout_delta = 0;
5000
5001 return 1;
5002 }
5003
5004 static void dump_acct_info(int all)
5005 {
5006 int i;
5007 FILE *f = NULL;
5008
5009
5010 CSTAT(dump_acct_info);
5011
5012 if (shut_acct_n)
5013 {
5014 for (i = 0; i < shut_acct_n; i++)
5015 dump_session(&f, &shut_acct[i]);
5016
5017 shut_acct_n = 0;
5018 }
5019
5020 if (all)
5021 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5022 dump_session(&f, &session[i]);
5023
5024 if (f)
5025 fclose(f);
5026 }
5027
5028 // Main program
5029 int main(int argc, char *argv[])
5030 {
5031 int i;
5032 int optdebug = 0;
5033 char *optconfig = CONFIGFILE;
5034
5035 time(&basetime); // start clock
5036
5037 // scan args
5038 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5039 {
5040 switch (i)
5041 {
5042 case 'd':
5043 if (fork()) exit(0);
5044 setsid();
5045 freopen("/dev/null", "r", stdin);
5046 freopen("/dev/null", "w", stdout);
5047 freopen("/dev/null", "w", stderr);
5048 break;
5049 case 'v':
5050 optdebug++;
5051 break;
5052 case 'c':
5053 optconfig = optarg;
5054 break;
5055 case 'h':
5056 snprintf(hostname, sizeof(hostname), "%s", optarg);
5057 break;
5058 default:
5059 printf("Args are:\n"
5060 "\t-d\t\tDetach from terminal\n"
5061 "\t-c <file>\tConfig file\n"
5062 "\t-h <hostname>\tForce hostname\n"
5063 "\t-v\t\tDebug\n");
5064
5065 return (0);
5066 break;
5067 }
5068 }
5069
5070 // Start the timer routine off
5071 time(&time_now);
5072 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5073
5074 initplugins();
5075 initdata(optdebug, optconfig);
5076
5077 init_cli();
5078 read_config_file();
5079 /* set hostname /after/ having read the config file */
5080 if (*config->hostname)
5081 strcpy(hostname, config->hostname);
5082 cli_init_complete(hostname);
5083 update_config();
5084 init_tbf(config->num_tbfs);
5085
5086 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5087 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5088 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5089 {
5090 struct rlimit rlim;
5091 rlim.rlim_cur = RLIM_INFINITY;
5092 rlim.rlim_max = RLIM_INFINITY;
5093 // Remove the maximum core size
5094 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5095 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5096
5097 // Make core dumps go to /tmp
5098 chdir("/tmp");
5099 }
5100
5101 if (config->scheduler_fifo)
5102 {
5103 int ret;
5104 struct sched_param params = {0};
5105 params.sched_priority = 1;
5106
5107 if (get_nprocs() < 2)
5108 {
5109 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5110 config->scheduler_fifo = 0;
5111 }
5112 else
5113 {
5114 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5115 {
5116 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5117 }
5118 else
5119 {
5120 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5121 config->scheduler_fifo = 0;
5122 }
5123 }
5124 }
5125
5126 initnetlink();
5127
5128 /* Set up the cluster communications port. */
5129 if (cluster_init() < 0)
5130 exit(1);
5131
5132 inittun();
5133 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5134
5135 if (*config->pppoe_if_to_bind)
5136 {
5137 init_pppoe();
5138 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5139 }
5140
5141 if (!config->nbmultiaddress)
5142 {
5143 config->bind_n_address[0] = config->bind_address;
5144 config->nbmultiaddress++;
5145 }
5146 config->nbudpfd = config->nbmultiaddress;
5147 for (i = 0; i < config->nbudpfd; i++)
5148 initudp(&udpfd[i], config->bind_n_address[i]);
5149 initlacudp();
5150 config->indexlacudpfd = config->nbudpfd;
5151 udpfd[config->indexlacudpfd] = udplacfd;
5152 config->nbudpfd++;
5153
5154 initcontrol();
5155 initdae();
5156
5157 // Intercept
5158 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5159
5160 initrad();
5161 initippool();
5162
5163 // seed prng
5164 {
5165 unsigned seed = time_now ^ getpid();
5166 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5167 srand(seed);
5168 }
5169
5170 signal(SIGHUP, sighup_handler);
5171 signal(SIGCHLD, sigchild_handler);
5172 signal(SIGTERM, shutdown_handler);
5173 signal(SIGINT, shutdown_handler);
5174 signal(SIGQUIT, shutdown_handler);
5175
5176 // Prevent us from getting paged out
5177 if (config->lock_pages)
5178 {
5179 if (!mlockall(MCL_CURRENT))
5180 LOG(1, 0, 0, "Locking pages into memory\n");
5181 else
5182 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5183 }
5184
5185 mainloop();
5186
5187 /* remove plugins (so cleanup code gets run) */
5188 plugins_done();
5189
5190 // Remove the PID file if we wrote it
5191 if (config->wrote_pid && *config->pid_file == '/')
5192 unlink(config->pid_file);
5193
5194 /* kill CLI children */
5195 signal(SIGTERM, SIG_IGN);
5196 kill(0, SIGTERM);
5197 return 0;
5198 }
5199
5200 static void sighup_handler(int sig)
5201 {
5202 main_reload++;
5203 }
5204
5205 static void shutdown_handler(int sig)
5206 {
5207 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5208 }
5209
5210 static void sigchild_handler(int sig)
5211 {
5212 while (waitpid(-1, NULL, WNOHANG) > 0)
5213 ;
5214 }
5215
5216 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5217 {
5218 MD5_CTX ctx;
5219 *challenge_response = NULL;
5220
5221 if (!*config->l2tp_secret)
5222 {
5223 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5224 return;
5225 }
5226
5227 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5228
5229 *challenge_response = calloc(17, 1);
5230
5231 MD5_Init(&ctx);
5232 MD5_Update(&ctx, &id, 1);
5233 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5234 MD5_Update(&ctx, challenge, challenge_length);
5235 MD5_Final(*challenge_response, &ctx);
5236
5237 return;
5238 }
5239
5240 static int facility_value(char *name)
5241 {
5242 int i;
5243 for (i = 0; facilitynames[i].c_name; i++)
5244 {
5245 if (strcmp(facilitynames[i].c_name, name) == 0)
5246 return facilitynames[i].c_val;
5247 }
5248 return 0;
5249 }
5250
5251 static void update_config()
5252 {
5253 int i;
5254 char *p;
5255 static int timeout = 0;
5256 static int interval = 0;
5257
5258 // Update logging
5259 closelog();
5260 syslog_log = 0;
5261 if (log_stream)
5262 {
5263 if (log_stream != stderr)
5264 fclose(log_stream);
5265
5266 log_stream = NULL;
5267 }
5268
5269 if (*config->log_filename)
5270 {
5271 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5272 {
5273 char *p = config->log_filename + 7;
5274 if (*p)
5275 {
5276 openlog("l2tpns", LOG_PID, facility_value(p));
5277 syslog_log = 1;
5278 }
5279 }
5280 else if (strchr(config->log_filename, '/') == config->log_filename)
5281 {
5282 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5283 {
5284 fseek(log_stream, 0, SEEK_END);
5285 setbuf(log_stream, NULL);
5286 }
5287 else
5288 {
5289 log_stream = stderr;
5290 setbuf(log_stream, NULL);
5291 }
5292 }
5293 }
5294 else
5295 {
5296 log_stream = stderr;
5297 setbuf(log_stream, NULL);
5298 }
5299
5300 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5301 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5302
5303 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5304 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5305 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5306
5307 // reset MRU/MSS globals
5308 MRU = config->l2tp_mtu - L2TP_HDRS;
5309 if (MRU > PPPoE_MRU)
5310 MRU = PPPoE_MRU;
5311
5312 MSS = MRU - TCP_HDRS;
5313
5314 // Update radius
5315 config->numradiusservers = 0;
5316 for (i = 0; i < MAXRADSERVER; i++)
5317 if (config->radiusserver[i])
5318 {
5319 config->numradiusservers++;
5320 // Set radius port: if not set, take the port from the
5321 // first radius server. For the first radius server,
5322 // take the #defined default value from l2tpns.h
5323
5324 // test twice, In case someone works with
5325 // a secondary radius server without defining
5326 // a primary one, this will work even then.
5327 if (i > 0 && !config->radiusport[i])
5328 config->radiusport[i] = config->radiusport[i-1];
5329 if (!config->radiusport[i])
5330 config->radiusport[i] = RADPORT;
5331 }
5332
5333 if (!config->numradiusservers)
5334 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5335
5336 // parse radius_authtypes_s
5337 config->radius_authtypes = config->radius_authprefer = 0;
5338 p = config->radius_authtypes_s;
5339 while (p && *p)
5340 {
5341 char *s = strpbrk(p, " \t,");
5342 int type = 0;
5343
5344 if (s)
5345 {
5346 *s++ = 0;
5347 while (*s == ' ' || *s == '\t')
5348 s++;
5349
5350 if (!*s)
5351 s = 0;
5352 }
5353
5354 if (!strncasecmp("chap", p, strlen(p)))
5355 type = AUTHCHAP;
5356 else if (!strncasecmp("pap", p, strlen(p)))
5357 type = AUTHPAP;
5358 else
5359 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5360
5361 config->radius_authtypes |= type;
5362 if (!config->radius_authprefer)
5363 config->radius_authprefer = type;
5364
5365 p = s;
5366 }
5367
5368 if (!config->radius_authtypes)
5369 {
5370 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5371 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5372 }
5373
5374 // normalise radius_authtypes_s
5375 if (config->radius_authprefer == AUTHPAP)
5376 {
5377 strcpy(config->radius_authtypes_s, "pap");
5378 if (config->radius_authtypes & AUTHCHAP)
5379 strcat(config->radius_authtypes_s, ", chap");
5380 }
5381 else
5382 {
5383 strcpy(config->radius_authtypes_s, "chap");
5384 if (config->radius_authtypes & AUTHPAP)
5385 strcat(config->radius_authtypes_s, ", pap");
5386 }
5387
5388 if (!config->radius_dae_port)
5389 config->radius_dae_port = DAEPORT;
5390
5391 if(!config->bind_portremotelns)
5392 config->bind_portremotelns = L2TPLACPORT;
5393 if(!config->bind_address_remotelns)
5394 config->bind_address_remotelns = INADDR_ANY;
5395
5396 if (*config->bind_multi_address)
5397 {
5398 char *sip = config->bind_multi_address;
5399 char *n = sip;
5400 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5401 config->nbmultiaddress = 0;
5402
5403 while (*sip && (sip < e))
5404 {
5405 in_addr_t ip = 0;
5406 uint8_t u = 0;
5407
5408 while (n < e && (*n == ',' || *n == ' ')) n++;
5409
5410 while (n < e && (isdigit(*n) || *n == '.'))
5411 {
5412 if (*n == '.')
5413 {
5414 ip = (ip << 8) + u;
5415 u = 0;
5416 }
5417 else
5418 u = u * 10 + *n - '0';
5419 n++;
5420 }
5421 ip = (ip << 8) + u;
5422 n++;
5423
5424 if (ip)
5425 {
5426 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5427 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5428 config->nbmultiaddress++;
5429 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5430
5431 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5432 }
5433
5434 sip = n;
5435 }
5436
5437 if (config->nbmultiaddress >= 1)
5438 {
5439 config->bind_address = config->bind_n_address[0];
5440 config->iftun_address = config->bind_address;
5441 }
5442 }
5443
5444 if(!config->iftun_address)
5445 {
5446 config->iftun_address = config->bind_address;
5447 config->iftun_n_address[0] = config->iftun_address;
5448 }
5449
5450 if (*config->multi_hostname)
5451 {
5452 char *shost = config->multi_hostname;
5453 char *n = shost;
5454 char *e = config->multi_hostname + strlen(config->multi_hostname);
5455 config->nbmultihostname = 0;
5456
5457 while (*shost && (shost < e))
5458 {
5459 while ((n < e) && (*n == ' ' || *n == '\t')) n++;
5460
5461 i = 0;
5462 while (n < e && (*n != ',') && (*n != '\t'))
5463 {
5464 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5465 n++;i++;
5466 }
5467 if (i > 0)
5468 {
5469 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5470 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5471 config->nbmultihostname++;
5472 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5473 }
5474 }
5475
5476 if (config->nbmultihostname >= 1)
5477 {
5478 strcpy(hostname, config->multi_n_hostname[0]);
5479 strcpy(config->hostname, hostname);
5480 }
5481 }
5482
5483 if (!*config->pppoe_ac_name)
5484 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5485
5486 // re-initialise the random number source
5487 initrandom(config->random_device);
5488
5489 // Update plugins
5490 for (i = 0; i < MAXPLUGINS; i++)
5491 {
5492 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5493 continue;
5494
5495 if (*config->plugins[i])
5496 {
5497 // Plugin added
5498 add_plugin(config->plugins[i]);
5499 }
5500 else if (*config->old_plugins[i])
5501 {
5502 // Plugin removed
5503 remove_plugin(config->old_plugins[i]);
5504 }
5505 }
5506
5507 // Guest change
5508 guest_accounts_num = 0;
5509 char *p2 = config->guest_user;
5510 while (p2 && *p2)
5511 {
5512 char *s = strpbrk(p2, " \t,");
5513 if (s)
5514 {
5515 *s++ = 0;
5516 while (*s == ' ' || *s == '\t')
5517 s++;
5518
5519 if (!*s)
5520 s = 0;
5521 }
5522
5523 strcpy(guest_users[guest_accounts_num], p2);
5524 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5525 guest_accounts_num++;
5526 p2 = s;
5527 }
5528 // Rebuild the guest_user array
5529 strcpy(config->guest_user, "");
5530 int ui = 0;
5531 for (ui=0; ui<guest_accounts_num; ui++)
5532 {
5533 strcat(config->guest_user, guest_users[ui]);
5534 if (ui<guest_accounts_num-1)
5535 {
5536 strcat(config->guest_user, ",");
5537 }
5538 }
5539
5540
5541 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5542 if (!config->multi_read_count) config->multi_read_count = 10;
5543 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5544 if (!*config->cluster_interface)
5545 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5546
5547 if (!config->cluster_hb_interval)
5548 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5549
5550 if (!config->cluster_hb_timeout)
5551 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5552
5553 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5554 {
5555 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5556 // late, ensure we're sufficiently larger than that
5557 int t = 4 * config->cluster_hb_interval + 11;
5558
5559 if (config->cluster_hb_timeout < t)
5560 {
5561 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5562 config->cluster_hb_timeout = t;
5563 }
5564
5565 // Push timing changes to the slaves immediately if we're the master
5566 if (config->cluster_iam_master)
5567 cluster_heartbeat();
5568
5569 interval = config->cluster_hb_interval;
5570 timeout = config->cluster_hb_timeout;
5571 }
5572
5573 // Write PID file
5574 if (*config->pid_file == '/' && !config->wrote_pid)
5575 {
5576 FILE *f;
5577 if ((f = fopen(config->pid_file, "w")))
5578 {
5579 fprintf(f, "%d\n", getpid());
5580 fclose(f);
5581 config->wrote_pid = 1;
5582 }
5583 else
5584 {
5585 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5586 }
5587 }
5588 }
5589
5590 static void read_config_file()
5591 {
5592 FILE *f;
5593
5594 if (!config->config_file) return;
5595 if (!(f = fopen(config->config_file, "r")))
5596 {
5597 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5598 return;
5599 }
5600
5601 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5602 cli_do_file(f);
5603 LOG(3, 0, 0, "Done reading config file\n");
5604 fclose(f);
5605 }
5606
5607 int sessionsetup(sessionidt s, tunnelidt t)
5608 {
5609 // A session now exists, set it up
5610 in_addr_t ip;
5611 char *user;
5612 sessionidt i;
5613 int r;
5614
5615 CSTAT(sessionsetup);
5616
5617 LOG(3, s, t, "Doing session setup for session\n");
5618
5619 // Join a bundle if the MRRU option is accepted
5620 if(session[s].mrru > 0 && session[s].bundle == 0)
5621 {
5622 LOG(3, s, t, "This session can be part of multilink bundle\n");
5623 if (join_bundle(s) > 0)
5624 cluster_send_bundle(session[s].bundle);
5625 else
5626 {
5627 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5628 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5629 return 0;
5630 }
5631 }
5632
5633 if (!session[s].ip)
5634 {
5635 assign_ip_address(s);
5636 if (!session[s].ip)
5637 {
5638 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5639 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5640 return 0;
5641 }
5642 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5643 fmtaddr(htonl(session[s].ip), 0));
5644 }
5645
5646 // Make sure this is right
5647 session[s].tunnel = t;
5648
5649 // zap old sessions with same IP and/or username
5650 // Don't kill gardened sessions - doing so leads to a DoS
5651 // from someone who doesn't need to know the password
5652 {
5653 ip = session[s].ip;
5654 user = session[s].user;
5655 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5656 {
5657 if (i == s) continue;
5658 if (!session[s].opened) break;
5659 // Allow duplicate sessions for multilink ones of the same bundle.
5660 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5661
5662 if (ip == session[i].ip)
5663 {
5664 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5665 continue;
5666 }
5667
5668 if (config->allow_duplicate_users) continue;
5669 if (session[s].walled_garden || session[i].walled_garden) continue;
5670 // Guest change
5671 int found = 0;
5672 int gu;
5673 for (gu = 0; gu < guest_accounts_num; gu++)
5674 {
5675 if (!strcasecmp(user, guest_users[gu]))
5676 {
5677 found = 1;
5678 break;
5679 }
5680 }
5681 if (found) continue;
5682
5683 // Drop the new session in case of duplicate sessionss, not the old one.
5684 if (!strcasecmp(user, session[i].user))
5685 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5686 }
5687 }
5688
5689 // no need to set a route for the same IP address of the bundle
5690 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5691 {
5692 int routed = 0;
5693
5694 // Add the route for this session.
5695 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5696 {
5697 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5698 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5699 routed++;
5700
5701 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5702 }
5703
5704 // Static IPs need to be routed if not already
5705 // convered by a Framed-Route. Anything else is part
5706 // of the IP address pool and is already routed, it
5707 // just needs to be added to the IP cache.
5708 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5709 if (session[s].ip_pool_index == -1) // static ip
5710 {
5711 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5712 }
5713 else
5714 cache_ipmap(session[s].ip, s);
5715 }
5716
5717 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5718 lcp_open(s, t); // transition to Network phase and send initial IPCP
5719
5720 // Run the plugin's against this new session.
5721 {
5722 struct param_new_session data = { &tunnel[t], &session[s] };
5723 run_plugins(PLUGIN_NEW_SESSION, &data);
5724 }
5725
5726 // Allocate TBFs if throttled
5727 if (session[s].throttle_in || session[s].throttle_out)
5728 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5729
5730 session[s].last_packet = session[s].last_data = time_now;
5731
5732 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5733 fmtaddr(htonl(session[s].ip), 0),
5734 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5735
5736 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5737
5738 return 1; // RADIUS OK and IP allocated, done...
5739 }
5740
5741 //
5742 // This session just got dropped on us by the master or something.
5743 // Make sure our tables up up to date...
5744 //
5745 int load_session(sessionidt s, sessiont *new)
5746 {
5747 int i;
5748 int newip = 0;
5749
5750 // Sanity checks.
5751 if (new->ip_pool_index >= MAXIPPOOL ||
5752 new->tunnel >= MAXTUNNEL)
5753 {
5754 LOG(0, s, 0, "Strange session update received!\n");
5755 // FIXME! What to do here?
5756 return 0;
5757 }
5758
5759 //
5760 // Ok. All sanity checks passed. Now we're committed to
5761 // loading the new session.
5762 //
5763
5764 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5765
5766 // See if routes/ip cache need updating
5767 if (new->ip != session[s].ip)
5768 newip++;
5769
5770 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5771 if (new->route[i].ip != session[s].route[i].ip ||
5772 new->route[i].prefixlen != session[s].route[i].prefixlen)
5773 newip++;
5774
5775 // needs update
5776 if (newip)
5777 {
5778 int routed = 0;
5779
5780 // remove old routes...
5781 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5782 {
5783 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5784 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5785 routed++;
5786
5787 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5788 }
5789
5790 // ...ip
5791 if (session[s].ip)
5792 {
5793 if (session[s].ip_pool_index == -1) // static IP
5794 {
5795 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5796 }
5797 else // It's part of the IP pool, remove it manually.
5798 uncache_ipmap(session[s].ip);
5799 }
5800
5801 routed = 0;
5802
5803 // add new routes...
5804 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5805 {
5806 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5807 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5808 routed++;
5809
5810 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5811 }
5812
5813 // ...ip
5814 if (new->ip)
5815 {
5816 // If there's a new one, add it.
5817 if (new->ip_pool_index == -1)
5818 {
5819 if (!routed) routeset(s, new->ip, 0, 0, 1);
5820 }
5821 else
5822 cache_ipmap(new->ip, s);
5823 }
5824 }
5825
5826 // check v6 routing
5827 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5828 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5829
5830 // check filters
5831 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5832 {
5833 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5834 new->filter_in = 0;
5835 }
5836
5837 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5838 {
5839 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5840 new->filter_out = 0;
5841 }
5842
5843 if (new->filter_in != session[s].filter_in)
5844 {
5845 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5846 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5847 }
5848
5849 if (new->filter_out != session[s].filter_out)
5850 {
5851 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5852 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5853 }
5854
5855 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5856 // for walking the sessions to forward byte counts to the master.
5857 config->cluster_highest_sessionid = s;
5858
5859 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5860
5861 // Do fixups into address pool.
5862 if (new->ip_pool_index != -1)
5863 fix_address_pool(s);
5864
5865 return 1;
5866 }
5867
5868 static void initplugins()
5869 {
5870 int i;
5871
5872 loaded_plugins = ll_init();
5873 // Initialize the plugins to nothing
5874 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5875 plugins[i] = ll_init();
5876 }
5877
5878 static void *open_plugin(char *plugin_name, int load)
5879 {
5880 char path[256] = "";
5881
5882 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5883 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5884 return dlopen(path, RTLD_NOW);
5885 }
5886
5887 // plugin callback to get a config value
5888 static void *getconfig(char *key, enum config_typet type)
5889 {
5890 int i;
5891
5892 for (i = 0; config_values[i].key; i++)
5893 {
5894 if (!strcmp(config_values[i].key, key))
5895 {
5896 if (config_values[i].type == type)
5897 return ((void *) config) + config_values[i].offset;
5898
5899 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5900 key, type, config_values[i].type);
5901
5902 return 0;
5903 }
5904 }
5905
5906 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5907 return 0;
5908 }
5909
5910 static int add_plugin(char *plugin_name)
5911 {
5912 static struct pluginfuncs funcs = {
5913 _log,
5914 _log_hex,
5915 fmtaddr,
5916 sessionbyuser,
5917 sessiontbysessionidt,
5918 sessionidtbysessiont,
5919 radiusnew,
5920 radiussend,
5921 getconfig,
5922 sessionshutdown,
5923 sessionkill,
5924 throttle_session,
5925 cluster_send_session,
5926 };
5927
5928 void *p = open_plugin(plugin_name, 1);
5929 int (*initfunc)(struct pluginfuncs *);
5930 int i;
5931
5932 if (!p)
5933 {
5934 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5935 return -1;
5936 }
5937
5938 if (ll_contains(loaded_plugins, p))
5939 {
5940 dlclose(p);
5941 return 0; // already loaded
5942 }
5943
5944 {
5945 int *v = dlsym(p, "plugin_api_version");
5946 if (!v || *v != PLUGIN_API_VERSION)
5947 {
5948 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5949 dlclose(p);
5950 return -1;
5951 }
5952 }
5953
5954 if ((initfunc = dlsym(p, "plugin_init")))
5955 {
5956 if (!initfunc(&funcs))
5957 {
5958 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5959 dlclose(p);
5960 return -1;
5961 }
5962 }
5963
5964 ll_push(loaded_plugins, p);
5965
5966 for (i = 0; i < max_plugin_functions; i++)
5967 {
5968 void *x;
5969 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5970 {
5971 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5972 ll_push(plugins[i], x);
5973 }
5974 }
5975
5976 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5977 return 1;
5978 }
5979
5980 static void run_plugin_done(void *plugin)
5981 {
5982 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5983
5984 if (donefunc)
5985 donefunc();
5986 }
5987
5988 static int remove_plugin(char *plugin_name)
5989 {
5990 void *p = open_plugin(plugin_name, 0);
5991 int loaded = 0;
5992
5993 if (!p)
5994 return -1;
5995
5996 if (ll_contains(loaded_plugins, p))
5997 {
5998 int i;
5999 for (i = 0; i < max_plugin_functions; i++)
6000 {
6001 void *x;
6002 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6003 ll_delete(plugins[i], x);
6004 }
6005
6006 ll_delete(loaded_plugins, p);
6007 run_plugin_done(p);
6008 loaded = 1;
6009 }
6010
6011 dlclose(p);
6012 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6013 return loaded;
6014 }
6015
6016 int run_plugins(int plugin_type, void *data)
6017 {
6018 int (*func)(void *data);
6019
6020 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6021 return PLUGIN_RET_ERROR;
6022
6023 ll_reset(plugins[plugin_type]);
6024 while ((func = ll_next(plugins[plugin_type])))
6025 {
6026 int r = func(data);
6027
6028 if (r != PLUGIN_RET_OK)
6029 return r; // stop here
6030 }
6031
6032 return PLUGIN_RET_OK;
6033 }
6034
6035 static void plugins_done()
6036 {
6037 void *p;
6038
6039 ll_reset(loaded_plugins);
6040 while ((p = ll_next(loaded_plugins)))
6041 run_plugin_done(p);
6042 }
6043
6044 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6045 {
6046 struct nsctl request;
6047 struct nsctl response;
6048 int type = unpack_control(&request, buf, len);
6049 int r;
6050 void *p;
6051
6052 if (log_stream && config->debug >= 4)
6053 {
6054 if (type < 0)
6055 {
6056 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6057 fmtaddr(addr->sin_addr.s_addr, 0), type);
6058 }
6059 else
6060 {
6061 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6062 dump_control(&request, log_stream);
6063 }
6064 }
6065
6066 switch (type)
6067 {
6068 case NSCTL_REQ_LOAD:
6069 if (request.argc != 1)
6070 {
6071 response.type = NSCTL_RES_ERR;
6072 response.argc = 1;
6073 response.argv[0] = "name of plugin required";
6074 }
6075 else if ((r = add_plugin(request.argv[0])) < 1)
6076 {
6077 response.type = NSCTL_RES_ERR;
6078 response.argc = 1;
6079 response.argv[0] = !r
6080 ? "plugin already loaded"
6081 : "error loading plugin";
6082 }
6083 else
6084 {
6085 response.type = NSCTL_RES_OK;
6086 response.argc = 0;
6087 }
6088
6089 break;
6090
6091 case NSCTL_REQ_UNLOAD:
6092 if (request.argc != 1)
6093 {
6094 response.type = NSCTL_RES_ERR;
6095 response.argc = 1;
6096 response.argv[0] = "name of plugin required";
6097 }
6098 else if ((r = remove_plugin(request.argv[0])) < 1)
6099 {
6100 response.type = NSCTL_RES_ERR;
6101 response.argc = 1;
6102 response.argv[0] = !r
6103 ? "plugin not loaded"
6104 : "plugin not found";
6105 }
6106 else
6107 {
6108 response.type = NSCTL_RES_OK;
6109 response.argc = 0;
6110 }
6111
6112 break;
6113
6114 case NSCTL_REQ_HELP:
6115 response.type = NSCTL_RES_OK;
6116 response.argc = 0;
6117
6118 ll_reset(loaded_plugins);
6119 while ((p = ll_next(loaded_plugins)))
6120 {
6121 char **help = dlsym(p, "plugin_control_help");
6122 while (response.argc < 0xff && help && *help)
6123 response.argv[response.argc++] = *help++;
6124 }
6125
6126 break;
6127
6128 case NSCTL_REQ_CONTROL:
6129 {
6130 struct param_control param = {
6131 config->cluster_iam_master,
6132 request.argc,
6133 request.argv,
6134 0,
6135 NULL,
6136 };
6137
6138 int r = run_plugins(PLUGIN_CONTROL, &param);
6139
6140 if (r == PLUGIN_RET_ERROR)
6141 {
6142 response.type = NSCTL_RES_ERR;
6143 response.argc = 1;
6144 response.argv[0] = param.additional
6145 ? param.additional
6146 : "error returned by plugin";
6147 }
6148 else if (r == PLUGIN_RET_NOTMASTER)
6149 {
6150 static char msg[] = "must be run on master: 000.000.000.000";
6151
6152 response.type = NSCTL_RES_ERR;
6153 response.argc = 1;
6154 if (config->cluster_master_address)
6155 {
6156 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6157 response.argv[0] = msg;
6158 }
6159 else
6160 {
6161 response.argv[0] = "must be run on master: none elected";
6162 }
6163 }
6164 else if (!(param.response & NSCTL_RESPONSE))
6165 {
6166 response.type = NSCTL_RES_ERR;
6167 response.argc = 1;
6168 response.argv[0] = param.response
6169 ? "unrecognised response value from plugin"
6170 : "unhandled action";
6171 }
6172 else
6173 {
6174 response.type = param.response;
6175 response.argc = 0;
6176 if (param.additional)
6177 {
6178 response.argc = 1;
6179 response.argv[0] = param.additional;
6180 }
6181 }
6182 }
6183
6184 break;
6185
6186 default:
6187 response.type = NSCTL_RES_ERR;
6188 response.argc = 1;
6189 response.argv[0] = "error unpacking control packet";
6190 }
6191
6192 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6193 if (!buf)
6194 {
6195 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6196 return;
6197 }
6198
6199 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6200 if (r > 0)
6201 {
6202 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6203 if (log_stream && config->debug >= 4)
6204 {
6205 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6206 dump_control(&response, log_stream);
6207 }
6208 }
6209 else
6210 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6211 fmtaddr(addr->sin_addr.s_addr, 0), r);
6212
6213 free(buf);
6214 }
6215
6216 static tunnelidt new_tunnel()
6217 {
6218 tunnelidt i;
6219 for (i = 1; i < MAXTUNNEL; i++)
6220 {
6221 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6222 {
6223 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6224 if (i > config->cluster_highest_tunnelid)
6225 config->cluster_highest_tunnelid = i;
6226 return i;
6227 }
6228 }
6229 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6230 return 0;
6231 }
6232
6233 //
6234 // We're becoming the master. Do any required setup..
6235 //
6236 // This is principally telling all the plugins that we're
6237 // now a master, and telling them about all the sessions
6238 // that are active too..
6239 //
6240 void become_master(void)
6241 {
6242 int s, i;
6243 static struct event_data d[RADIUS_FDS];
6244 struct epoll_event e;
6245
6246 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6247
6248 // running a bunch of iptables commands is slow and can cause
6249 // the master to drop tunnels on takeover--kludge around the
6250 // problem by forking for the moment (note: race)
6251 if (!fork_and_close())
6252 {
6253 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6254 {
6255 if (!session[s].opened) // Not an in-use session.
6256 continue;
6257
6258 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6259 }
6260 exit(0);
6261 }
6262
6263 // add radius fds
6264 e.events = EPOLLIN;
6265 for (i = 0; i < RADIUS_FDS; i++)
6266 {
6267 d[i].type = FD_TYPE_RADIUS;
6268 d[i].index = i;
6269 e.data.ptr = &d[i];
6270
6271 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6272 }
6273 }
6274
6275 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6276 {
6277 int s, i;
6278 int count = 0;
6279 int buckets[64];
6280
6281 if (CLI_HELP_REQUESTED)
6282 return CLI_HELP_NO_ARGS;
6283
6284 time(&time_now);
6285 for (i = 0; i < 64;++i) buckets[i] = 0;
6286
6287 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6288 {
6289 int idle;
6290 if (!session[s].opened)
6291 continue;
6292
6293 idle = time_now - session[s].last_data;
6294 idle /= 5 ; // In multiples of 5 seconds.
6295 if (idle < 0)
6296 idle = 0;
6297 if (idle > 63)
6298 idle = 63;
6299
6300 ++count;
6301 ++buckets[idle];
6302 }
6303
6304 for (i = 0; i < 63; ++i)
6305 {
6306 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6307 }
6308 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6309 cli_print(cli, "%d total sessions open.", count);
6310 return CLI_OK;
6311 }
6312
6313 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6314 {
6315 int s, i;
6316 int count = 0;
6317 int buckets[64];
6318
6319 if (CLI_HELP_REQUESTED)
6320 return CLI_HELP_NO_ARGS;
6321
6322 time(&time_now);
6323 for (i = 0; i < 64;++i) buckets[i] = 0;
6324
6325 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6326 {
6327 int open = 0, d;
6328 if (!session[s].opened)
6329 continue;
6330
6331 d = time_now - session[s].opened;
6332 if (d < 0)
6333 d = 0;
6334 while (d > 1 && open < 32)
6335 {
6336 ++open;
6337 d >>= 1; // half.
6338 }
6339 ++count;
6340 ++buckets[open];
6341 }
6342
6343 s = 1;
6344 for (i = 0; i < 30; ++i)
6345 {
6346 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6347 s <<= 1;
6348 }
6349 cli_print(cli, "%d total sessions open.", count);
6350 return CLI_OK;
6351 }
6352
6353 /* Unhide an avp.
6354 *
6355 * This unencodes the AVP using the L2TP secret and the previously
6356 * stored random vector. It overwrites the hidden data with the
6357 * unhidden AVP subformat.
6358 */
6359 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6360 {
6361 MD5_CTX ctx;
6362 uint8_t digest[16];
6363 uint8_t *last;
6364 size_t d = 0;
6365 uint16_t m = htons(type);
6366
6367 // Compute initial pad
6368 MD5_Init(&ctx);
6369 MD5_Update(&ctx, (unsigned char *) &m, 2);
6370 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6371 MD5_Update(&ctx, vector, vec_len);
6372 MD5_Final(digest, &ctx);
6373
6374 // pointer to last decoded 16 octets
6375 last = value;
6376
6377 while (len > 0)
6378 {
6379 // calculate a new pad based on the last decoded block
6380 if (d >= sizeof(digest))
6381 {
6382 MD5_Init(&ctx);
6383 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6384 MD5_Update(&ctx, last, sizeof(digest));
6385 MD5_Final(digest, &ctx);
6386
6387 d = 0;
6388 last = value;
6389 }
6390
6391 *value++ ^= digest[d++];
6392 len--;
6393 }
6394 }
6395
6396 int find_filter(char const *name, size_t len)
6397 {
6398 int free = -1;
6399 int i;
6400
6401 for (i = 0; i < MAXFILTER; i++)
6402 {
6403 if (!*ip_filters[i].name)
6404 {
6405 if (free < 0)
6406 free = i;
6407
6408 continue;
6409 }
6410
6411 if (strlen(ip_filters[i].name) != len)
6412 continue;
6413
6414 if (!strncmp(ip_filters[i].name, name, len))
6415 return i;
6416 }
6417
6418 return free;
6419 }
6420
6421 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6422 {
6423 switch (p->op)
6424 {
6425 case FILTER_PORT_OP_EQ: return port == p->port;
6426 case FILTER_PORT_OP_NEQ: return port != p->port;
6427 case FILTER_PORT_OP_GT: return port > p->port;
6428 case FILTER_PORT_OP_LT: return port < p->port;
6429 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6430 }
6431
6432 return 0;
6433 }
6434
6435 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6436 {
6437 switch (op)
6438 {
6439 case FILTER_FLAG_OP_ANY:
6440 return (flags & sflags) || (~flags & cflags);
6441
6442 case FILTER_FLAG_OP_ALL:
6443 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6444
6445 case FILTER_FLAG_OP_EST:
6446 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6447 }
6448
6449 return 0;
6450 }
6451
6452 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6453 {
6454 uint16_t frag_offset;
6455 uint8_t proto;
6456 in_addr_t src_ip;
6457 in_addr_t dst_ip;
6458 uint16_t src_port = 0;
6459 uint16_t dst_port = 0;
6460 uint8_t flags = 0;
6461 ip_filter_rulet *rule;
6462
6463 if (len < 20) // up to end of destination address
6464 return 0;
6465
6466 if ((*buf >> 4) != 4) // IPv4
6467 return 0;
6468
6469 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6470 proto = buf[9];
6471 src_ip = *(in_addr_t *) (buf + 12);
6472 dst_ip = *(in_addr_t *) (buf + 16);
6473
6474 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6475 {
6476 int l = (buf[0] & 0xf) * 4; // length of IP header
6477 if (len < l + 4) // ports
6478 return 0;
6479
6480 src_port = ntohs(*(uint16_t *) (buf + l));
6481 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6482 if (proto == IPPROTO_TCP)
6483 {
6484 if (len < l + 14) // flags
6485 return 0;
6486
6487 flags = buf[l + 13] & 0x3f;
6488 }
6489 }
6490
6491 for (rule = ip_filters[filter].rules; rule->action; rule++)
6492 {
6493 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6494 continue;
6495
6496 if (rule->src_wild != INADDR_BROADCAST &&
6497 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6498 continue;
6499
6500 if (rule->dst_wild != INADDR_BROADCAST &&
6501 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6502 continue;
6503
6504 if (frag_offset)
6505 {
6506 // layer 4 deny rules are skipped
6507 if (rule->action == FILTER_ACTION_DENY &&
6508 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6509 continue;
6510 }
6511 else
6512 {
6513 if (rule->frag)
6514 continue;
6515
6516 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6517 {
6518 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6519 continue;
6520
6521 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6522 continue;
6523
6524 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6525 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6526 continue;
6527 }
6528 }
6529
6530 // matched
6531 rule->counter++;
6532 return rule->action == FILTER_ACTION_PERMIT;
6533 }
6534
6535 // default deny
6536 return 0;
6537 }
6538
6539 tunnelidt lac_new_tunnel()
6540 {
6541 return new_tunnel();
6542 }
6543
6544 void lac_tunnelclear(tunnelidt t)
6545 {
6546 tunnelclear(t);
6547 }
6548
6549 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6550 {
6551 uint16_t version = 0x0100; // protocol version
6552
6553 tunnel[t].state = TUNNELOPENING;
6554
6555 // Sent SCCRQ - Start Control Connection Request
6556 controlt *c = controlnew(1); // sending SCCRQ
6557 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6558 controls(c, 8, Vendor_name, 1); // Vendor name
6559 control16(c, 2, version, 1); // protocol version
6560 control32(c, 3, 3, 1); // framing Capabilities
6561 control16(c, 9, t, 1); // assigned tunnel
6562 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6563 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6564 controladd(c, 0, t); // send
6565 }
6566
6567 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6568 {
6569 // Sent ICRQ Incoming-call-request
6570 controlt *c = controlnew(10); // ICRQ
6571
6572 control16(c, 14, s, 1); // assigned sesion
6573 call_serial_number++;
6574 control32(c, 15, call_serial_number, 1); // call serial number
6575 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6576 controladd(c, 0, t); // send
6577 }
6578
6579 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6580 {
6581 tunnelshutdown(t, reason, result, error, msg);
6582 }
6583