Update debian changelog
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 #include <arpa/inet.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <linux/if_tun.h>
12 #define SYSLOG_NAMES
13 #include <stdio.h>
14 #include <syslog.h>
15 #include <malloc.h>
16 #include <net/route.h>
17 #include <sys/mman.h>
18 #include <netdb.h>
19 #include <netinet/in.h>
20 #include <netinet/ip6.h>
21 #include <stdarg.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/wait.h>
31 #include <net/if.h>
32 #include <stddef.h>
33 #include <time.h>
34 #include <dlfcn.h>
35 #include <unistd.h>
36 #include <sched.h>
37 #include <sys/sysinfo.h>
38 #include <libcli.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
41
42 #include "md5.h"
43 #include "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 {
1018 in_addr_t *pipv4 = (in_addr_t *) &ip.s6_addr[8];
1019 s = lookup_ipmap(*pipv4);
1020 } else {
1021 s = lookup_ipv6map(ip);
1022 }
1023
1024 if (s > 0 && s < MAXSESSION && session[s].opened)
1025 return s;
1026
1027 return 0;
1028 }
1029
1030 //
1031 // Take an IP address in HOST byte order and
1032 // add it to the sessionid by IP cache.
1033 //
1034 // (It's actually cached in network order)
1035 //
1036 static void cache_ipmap(in_addr_t ip, sessionidt s)
1037 {
1038 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1039 uint8_t *a = (uint8_t *) &nip;
1040 union iphash *h = ip_hash;
1041 int i;
1042
1043 for (i = 0; i < 3; i++)
1044 {
1045 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1046 return;
1047
1048 h = h[a[i]].idx;
1049 }
1050
1051 h[a[3]].sess = s;
1052
1053 if (s > 0)
1054 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1055
1056 else if (s == 0)
1057 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1058 // else a map to an ip pool index.
1059 }
1060
1061 static void uncache_ipmap(in_addr_t ip)
1062 {
1063 cache_ipmap(ip, 0); // Assign it to the NULL session.
1064 }
1065
1066 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1067 {
1068 int i;
1069 int bytes;
1070 struct ipv6radix *curnode;
1071 char ipv6addr[INET6_ADDRSTRLEN];
1072
1073 curnode = &ipv6_hash[ip.s6_addr[0]];
1074
1075 bytes = prefixlen >> 3;
1076 i = 1;
1077 while (i < bytes) {
1078 if (curnode->branch == NULL)
1079 {
1080 if (!(curnode->branch = calloc(256,
1081 sizeof (struct ipv6radix))))
1082 return;
1083 }
1084 curnode = &curnode->branch[ip.s6_addr[i]];
1085 i++;
1086 }
1087
1088 curnode->sess = s;
1089
1090 if (s > 0)
1091 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1092 inet_ntop(AF_INET6, &ip, ipv6addr,
1093 INET6_ADDRSTRLEN),
1094 prefixlen);
1095 else if (s == 0)
1096 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1097 inet_ntop(AF_INET6, &ip, ipv6addr,
1098 INET6_ADDRSTRLEN),
1099 prefixlen);
1100 }
1101
1102 //
1103 // CLI list to dump current ipcache.
1104 //
1105 int cmd_show_ipcache(struct cli_def *cli, const char *command, char **argv, int argc)
1106 {
1107 union iphash *d = ip_hash, *e, *f, *g;
1108 int i, j, k, l;
1109 int count = 0;
1110
1111 if (CLI_HELP_REQUESTED)
1112 return CLI_HELP_NO_ARGS;
1113
1114 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1115
1116 for (i = 0; i < 256; ++i)
1117 {
1118 if (!d[i].idx)
1119 continue;
1120
1121 e = d[i].idx;
1122 for (j = 0; j < 256; ++j)
1123 {
1124 if (!e[j].idx)
1125 continue;
1126
1127 f = e[j].idx;
1128 for (k = 0; k < 256; ++k)
1129 {
1130 if (!f[k].idx)
1131 continue;
1132
1133 g = f[k].idx;
1134 for (l = 0; l < 256; ++l)
1135 {
1136 if (!g[l].sess)
1137 continue;
1138
1139 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1140 ++count;
1141 }
1142 }
1143 }
1144 }
1145 cli_print(cli, "%d entries in cache", count);
1146 return CLI_OK;
1147 }
1148
1149
1150 // Find session by username, 0 for not found
1151 // walled garden users aren't authenticated, so the username is
1152 // reasonably useless. Ignore them to avoid incorrect actions
1153 //
1154 // This is VERY inefficent. Don't call it often. :)
1155 //
1156 sessionidt sessionbyuser(char *username)
1157 {
1158 int s;
1159 CSTAT(sessionbyuser);
1160
1161 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1162 {
1163 if (!session[s].opened)
1164 continue;
1165
1166 if (session[s].walled_garden)
1167 continue; // Skip walled garden users.
1168
1169 if (!strncmp(session[s].user, username, 128))
1170 return s;
1171
1172 }
1173 return 0; // Not found.
1174 }
1175
1176 void send_garp(in_addr_t ip)
1177 {
1178 int s;
1179 struct ifreq ifr;
1180 uint8_t mac[6];
1181
1182 s = socket(PF_INET, SOCK_DGRAM, 0);
1183 if (s < 0)
1184 {
1185 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1186 return;
1187 }
1188 memset(&ifr, 0, sizeof(ifr));
1189 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1190 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1191 {
1192 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1193 close(s);
1194 return;
1195 }
1196 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1197 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1198 {
1199 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1200 close(s);
1201 return;
1202 }
1203 close(s);
1204 sendarp(ifr.ifr_ifindex, mac, ip);
1205 }
1206
1207 static sessiont *sessiontbysessionidt(sessionidt s)
1208 {
1209 if (!s || s >= MAXSESSION) return NULL;
1210 return &session[s];
1211 }
1212
1213 static sessionidt sessionidtbysessiont(sessiont *s)
1214 {
1215 sessionidt val = s-session;
1216 if (s < session || val >= MAXSESSION) return 0;
1217 return val;
1218 }
1219
1220 // actually send a control message for a specific tunnel
1221 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1222 {
1223 struct sockaddr_in addr;
1224
1225 CSTAT(tunnelsend);
1226
1227 if (!t)
1228 {
1229 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1230 STAT(tunnel_tx_errors);
1231 return;
1232 }
1233
1234 if (t == TUNNEL_ID_PPPOE)
1235 {
1236 pppoe_sess_send(buf, l, t);
1237 return;
1238 }
1239
1240 if (!tunnel[t].ip)
1241 {
1242 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1243 STAT(tunnel_tx_errors);
1244 return;
1245 }
1246
1247 memset(&addr, 0, sizeof(addr));
1248 addr.sin_family = AF_INET;
1249 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1250 addr.sin_port = htons(tunnel[t].port);
1251
1252 // sequence expected, if sequence in message
1253 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1254
1255 // If this is a control message, deal with retries
1256 if (*buf & 0x80)
1257 {
1258 tunnel[t].last = time_now; // control message sent
1259 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1260 if (tunnel[t].try)
1261 {
1262 STAT(tunnel_retries);
1263 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1264 }
1265 }
1266
1267 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1268 {
1269 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1270 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1271 STAT(tunnel_tx_errors);
1272 return;
1273 }
1274
1275 LOG_HEX(5, "Send Tunnel Data", buf, l);
1276 STAT(tunnel_tx_packets);
1277 INC_STAT(tunnel_tx_bytes, l);
1278 }
1279
1280 //
1281 // Tiny helper function to write data to
1282 // the 'tun' device.
1283 //
1284 int tun_write(uint8_t * data, int size)
1285 {
1286 return write(tunfd, data, size);
1287 }
1288
1289 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1290 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1291 {
1292 int d = (tcp[12] >> 4) * 4;
1293 uint8_t *mss = 0;
1294 uint8_t *opts;
1295 uint8_t *data;
1296 uint16_t orig;
1297 uint32_t sum;
1298
1299 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1300 return;
1301
1302 if (tcp + d > buf + len) // short?
1303 return;
1304
1305 opts = tcp + 20;
1306 data = tcp + d;
1307
1308 while (opts < data)
1309 {
1310 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1311 {
1312 mss = opts + 2;
1313 if (mss + 2 > data) return; // short?
1314 break;
1315 }
1316
1317 if (*opts == 0) return; // end of options
1318 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1319 opts++;
1320 else
1321 opts += opts[1]; // skip over option
1322 }
1323
1324 if (!mss) return; // not found
1325 orig = ntohs(*(uint16_t *) mss);
1326
1327 if (orig <= MSS) return; // mss OK
1328
1329 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1330 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1331 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1332 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1333
1334 // set mss
1335 *(int16_t *) mss = htons(MSS);
1336
1337 // adjust checksum (see rfc1141)
1338 sum = orig + (~MSS & 0xffff);
1339 sum += ntohs(*(uint16_t *) (tcp + 16));
1340 sum = (sum & 0xffff) + (sum >> 16);
1341 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1342 }
1343
1344 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1345 {
1346 uint16_t proto;
1347 if (extra) {
1348 // Skip the four extra bytes
1349 p += 4;
1350 l -= 4;
1351 }
1352
1353 if (*p & 1)
1354 {
1355 proto = *p++;
1356 l--;
1357 }
1358 else
1359 {
1360 proto = ntohs(*(uint16_t *) p);
1361 p += 2;
1362 l -= 2;
1363 }
1364 if (proto == PPPIP)
1365 {
1366 if (session[s].die)
1367 {
1368 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1369 return; // closing session, PPP not processed
1370 }
1371 session[s].last_packet = session[s].last_data = time_now;
1372 processipin(s, t, p, l);
1373 }
1374 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1375 {
1376 if (session[s].die)
1377 {
1378 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1379 return; // closing session, PPP not processed
1380 }
1381
1382 session[s].last_packet = session[s].last_data = time_now;
1383 processipv6in(s, t, p, l);
1384 }
1385 else if (proto == PPPIPCP)
1386 {
1387 session[s].last_packet = session[s].last_data = time_now;
1388 processipcp(s, t, p, l);
1389 }
1390 else if (proto == PPPCCP)
1391 {
1392 session[s].last_packet = session[s].last_data = time_now;
1393 processccp(s, t, p, l);
1394 }
1395 else
1396 {
1397 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1398 }
1399 }
1400
1401 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1402 {
1403 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1404 sp->cout_delta += len;
1405 sp->pout++;
1406 sp->last_data = time_now;
1407
1408 sess_local[s].cout += len; // To send to master..
1409 sess_local[s].pout++;
1410 }
1411
1412 // process outgoing (to tunnel) IP
1413 //
1414 // (i.e. this routine writes to data[-8]).
1415 void processipout(uint8_t *buf, int len)
1416 {
1417 sessionidt s;
1418 sessiont *sp;
1419 tunnelidt t;
1420 in_addr_t ip;
1421
1422 uint8_t *data = buf; // Keep a copy of the originals.
1423 int size = len;
1424
1425 uint8_t fragbuf[MAXETHER + 20];
1426
1427 CSTAT(processipout);
1428
1429 if (len < MIN_IP_SIZE)
1430 {
1431 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1432 STAT(tun_rx_errors);
1433 return;
1434 }
1435 if (len >= MAXETHER)
1436 {
1437 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1438 STAT(tun_rx_errors);
1439 return;
1440 }
1441
1442 // Skip the tun header
1443 buf += 4;
1444 len -= 4;
1445
1446 // Got an IP header now
1447 if (*(uint8_t *)(buf) >> 4 != 4)
1448 {
1449 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1450 return;
1451 }
1452
1453 ip = *(uint32_t *)(buf + 16);
1454 if (!(s = sessionbyip(ip)))
1455 {
1456 // Is this a packet for a session that doesn't exist?
1457 static int rate = 0; // Number of ICMP packets we've sent this second.
1458 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1459
1460 if (last != time_now)
1461 {
1462 last = time_now;
1463 rate = 0;
1464 }
1465
1466 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1467 {
1468 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1469 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1470 config->bind_address ? config->bind_address : my_address, buf, len);
1471 }
1472 return;
1473 }
1474
1475 t = session[s].tunnel;
1476 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1477 {
1478 LOG(3, s, t, "Packet size more than session MRU\n");
1479 return;
1480 }
1481
1482 sp = &session[s];
1483
1484 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1485 if (config->max_packets > 0)
1486 {
1487 if (sess_local[s].last_packet_out == TIME)
1488 {
1489 int max = config->max_packets;
1490
1491 // All packets for throttled sessions are handled by the
1492 // master, so further limit by using the throttle rate.
1493 // A bit of a kludge, since throttle rate is in kbps,
1494 // but should still be generous given our average DSL
1495 // packet size is 200 bytes: a limit of 28kbps equates
1496 // to around 180 packets per second.
1497 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1498 max = sp->throttle_out;
1499
1500 if (++sess_local[s].packets_out > max)
1501 {
1502 sess_local[s].packets_dropped++;
1503 return;
1504 }
1505 }
1506 else
1507 {
1508 if (sess_local[s].packets_dropped)
1509 {
1510 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1511 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1512 sess_local[s].packets_dropped, sess_local[s].packets_out,
1513 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1514 sp->user);
1515 }
1516
1517 sess_local[s].last_packet_out = TIME;
1518 sess_local[s].packets_out = 1;
1519 sess_local[s].packets_dropped = 0;
1520 }
1521 }
1522
1523 // run access-list if any
1524 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1525 return;
1526
1527 // adjust MSS on SYN and SYN,ACK packets with options
1528 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1529 {
1530 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1531 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1532 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1533 }
1534
1535 if (sp->tbf_out)
1536 {
1537 // Are we throttling this session?
1538 if (config->cluster_iam_master)
1539 tbf_queue_packet(sp->tbf_out, data, size);
1540 else
1541 master_throttle_packet(sp->tbf_out, data, size);
1542 return;
1543 }
1544
1545 if (sp->walled_garden && !config->cluster_iam_master)
1546 {
1547 // We are walled-gardening this
1548 master_garden_packet(s, data, size);
1549 return;
1550 }
1551
1552 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1553 {
1554
1555 if (!config->cluster_iam_master)
1556 {
1557 // The MPPP packets must be managed by the Master.
1558 master_forward_mppp_packet(s, data, size);
1559 return;
1560 }
1561
1562 // Add on L2TP header
1563 sessionidt members[MAXBUNDLESES];
1564 bundleidt bid = session[s].bundle;
1565 bundlet *b = &bundle[bid];
1566 uint32_t num_of_links, nb_opened;
1567 int i;
1568
1569 num_of_links = b->num_of_links;
1570 nb_opened = 0;
1571 for (i = 0;i < num_of_links;i++)
1572 {
1573 s = b->members[i];
1574 if (session[s].ppp.lcp == Opened)
1575 {
1576 members[nb_opened] = s;
1577 nb_opened++;
1578 }
1579 }
1580
1581 if (nb_opened < 1)
1582 {
1583 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1584 return;
1585 }
1586
1587 num_of_links = nb_opened;
1588 b->current_ses = (b->current_ses + 1) % num_of_links;
1589 s = members[b->current_ses];
1590 t = session[s].tunnel;
1591 sp = &session[s];
1592 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1593
1594 if (num_of_links > 1)
1595 {
1596 if(len > MINFRAGLEN)
1597 {
1598 //for rotate traffic among the member links
1599 uint32_t divisor = num_of_links;
1600 if (divisor > 2)
1601 divisor = divisor/2 + (divisor & 1);
1602
1603 // Partition the packet to "num_of_links" fragments
1604 uint32_t fraglen = len / divisor;
1605 uint32_t last_fraglen = fraglen + len % divisor;
1606 uint32_t remain = len;
1607
1608 // send the first packet
1609 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1610 if (!p) return;
1611 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1612
1613 // statistics
1614 update_session_out_stat(s, sp, fraglen);
1615
1616 remain -= fraglen;
1617 while (remain > last_fraglen)
1618 {
1619 b->current_ses = (b->current_ses + 1) % num_of_links;
1620 s = members[b->current_ses];
1621 t = session[s].tunnel;
1622 sp = &session[s];
1623 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1624 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1625 if (!p) return;
1626 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1627 update_session_out_stat(s, sp, fraglen);
1628 remain -= fraglen;
1629 }
1630 // send the last fragment
1631 b->current_ses = (b->current_ses + 1) % num_of_links;
1632 s = members[b->current_ses];
1633 t = session[s].tunnel;
1634 sp = &session[s];
1635 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1636 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1637 if (!p) return;
1638 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1639 update_session_out_stat(s, sp, remain);
1640 if (remain != last_fraglen)
1641 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1642 }
1643 else
1644 {
1645 // Send it as one frame
1646 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1647 if (!p) return;
1648 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1649 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1650 update_session_out_stat(s, sp, len);
1651 }
1652 }
1653 else
1654 {
1655 // Send it as one frame (NO MPPP Frame)
1656 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1657 tunnelsend(p, len + (buf-p), t); // send it...
1658 update_session_out_stat(s, sp, len);
1659 }
1660 }
1661 else
1662 {
1663 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1664 tunnelsend(p, len + (buf-p), t); // send it...
1665 update_session_out_stat(s, sp, len);
1666 }
1667
1668 // Snooping this session, send it to intercept box
1669 if (sp->snoop_ip && sp->snoop_port)
1670 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1671
1672 udp_tx += len;
1673 }
1674
1675 // process outgoing (to tunnel) IPv6
1676 //
1677 static void processipv6out(uint8_t * buf, int len)
1678 {
1679 sessionidt s;
1680 sessiont *sp;
1681 tunnelidt t;
1682 in_addr_t ip;
1683 struct in6_addr ip6;
1684
1685 uint8_t *data = buf; // Keep a copy of the originals.
1686 int size = len;
1687
1688 uint8_t b[MAXETHER + 20];
1689
1690 CSTAT(processipv6out);
1691
1692 if (len < MIN_IP_SIZE)
1693 {
1694 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1695 STAT(tunnel_tx_errors);
1696 return;
1697 }
1698 if (len >= MAXETHER)
1699 {
1700 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1701 STAT(tunnel_tx_errors);
1702 return;
1703 }
1704
1705 // Skip the tun header
1706 buf += 4;
1707 len -= 4;
1708
1709 // Got an IP header now
1710 if (*(uint8_t *)(buf) >> 4 != 6)
1711 {
1712 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1713 return;
1714 }
1715
1716 ip6 = *(struct in6_addr *)(buf+24);
1717 s = sessionbyipv6(ip6);
1718
1719 if (s == 0)
1720 {
1721 ip = *(uint32_t *)(buf + 32);
1722 s = sessionbyip(ip);
1723 }
1724
1725 if (s == 0)
1726 {
1727 // Is this a packet for a session that doesn't exist?
1728 static int rate = 0; // Number of ICMP packets we've sent this second.
1729 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1730
1731 if (last != time_now)
1732 {
1733 last = time_now;
1734 rate = 0;
1735 }
1736
1737 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1738 {
1739 // FIXME: Should send icmp6 host unreachable
1740 }
1741 return;
1742 }
1743 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1744 {
1745 bundleidt bid = session[s].bundle;
1746 bundlet *b = &bundle[bid];
1747
1748 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1749 s = b->members[b->current_ses];
1750 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1751 }
1752 t = session[s].tunnel;
1753 sp = &session[s];
1754 sp->last_data = time_now;
1755
1756 // FIXME: add DoS prevention/filters?
1757
1758 if (sp->tbf_out)
1759 {
1760 // Are we throttling this session?
1761 if (config->cluster_iam_master)
1762 tbf_queue_packet(sp->tbf_out, data, size);
1763 else
1764 master_throttle_packet(sp->tbf_out, data, size);
1765 return;
1766 }
1767 else if (sp->walled_garden && !config->cluster_iam_master)
1768 {
1769 // We are walled-gardening this
1770 master_garden_packet(s, data, size);
1771 return;
1772 }
1773
1774 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1775
1776 // Add on L2TP header
1777 {
1778 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1779 if (!p) return;
1780 tunnelsend(b, len + (p-b), t); // send it...
1781 }
1782
1783 // Snooping this session, send it to intercept box
1784 if (sp->snoop_ip && sp->snoop_port)
1785 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1786
1787 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1788 sp->cout_delta += len;
1789 sp->pout++;
1790 udp_tx += len;
1791
1792 sess_local[s].cout += len; // To send to master..
1793 sess_local[s].pout++;
1794 }
1795
1796 //
1797 // Helper routine for the TBF filters.
1798 // Used to send queued data in to the user!
1799 //
1800 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1801 {
1802 sessiont *sp;
1803 tunnelidt t;
1804 uint8_t *p;
1805 uint8_t *data = buf; // Keep a copy of the originals.
1806
1807 uint8_t b[MAXETHER + 20];
1808
1809 if (len < 0 || len > MAXETHER)
1810 {
1811 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1812 return;
1813 }
1814
1815 // Skip the tun header
1816 buf += 4;
1817 len -= 4;
1818
1819 if (!session[s].ip)
1820 return;
1821
1822 t = session[s].tunnel;
1823 sp = &session[s];
1824
1825 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1826
1827 // Add on L2TP header
1828 if (*(uint16_t *) (data + 2) == htons(PKTIPV6))
1829 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0); // IPV6
1830 else
1831 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0); // IPV4
1832
1833 if (!p) return;
1834
1835 tunnelsend(b, len + (p-b), t); // send it...
1836
1837 // Snooping this session.
1838 if (sp->snoop_ip && sp->snoop_port)
1839 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1840
1841 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1842 sp->cout_delta += len;
1843 sp->pout++;
1844 udp_tx += len;
1845
1846 sess_local[s].cout += len; // To send to master..
1847 sess_local[s].pout++;
1848 }
1849
1850 // add an AVP (16 bit)
1851 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1852 {
1853 uint16_t l = (m ? 0x8008 : 0x0008);
1854 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1855 pint16[0] = htons(l);
1856 pint16[1] = htons(0);
1857 pint16[2] = htons(avp);
1858 pint16[3] = htons(val);
1859 c->length += 8;
1860 }
1861
1862 // add an AVP (32 bit)
1863 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1864 {
1865 uint16_t l = (m ? 0x800A : 0x000A);
1866 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1867 uint32_t *pint32 = (uint32_t *) (c->buf + c->length + 6);
1868 pint16[0] = htons(l);
1869 pint16[1] = htons(0);
1870 pint16[2] = htons(avp);
1871 pint32[0] = htonl(val);
1872 c->length += 10;
1873 }
1874
1875 // add an AVP (string)
1876 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1877 {
1878 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1879 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1880 pint16[0] = htons(l);
1881 pint16[1] = htons(0);
1882 pint16[2] = htons(avp);
1883 memcpy(c->buf + c->length + 6, val, strlen(val));
1884 c->length += 6 + strlen(val);
1885 }
1886
1887 // add a binary AVP
1888 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1889 {
1890 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1891 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1892 pint16[0] = htons(l);
1893 pint16[1] = htons(0);
1894 pint16[2] = htons(avp);
1895 memcpy(c->buf + c->length + 6, val, len);
1896 c->length += 6 + len;
1897 }
1898
1899 // new control connection
1900 static controlt *controlnew(uint16_t mtype)
1901 {
1902 controlt *c;
1903 if (!controlfree)
1904 c = malloc(sizeof(controlt));
1905 else
1906 {
1907 c = controlfree;
1908 controlfree = c->next;
1909 }
1910 assert(c);
1911 c->next = 0;
1912 c->buf[0] = 0xC8; // flags
1913 c->buf[1] = 0x02; // ver
1914 c->length = 12;
1915 control16(c, 0, mtype, 1);
1916 return c;
1917 }
1918
1919 // send zero block if nothing is waiting
1920 // (ZLB send).
1921 static void controlnull(tunnelidt t)
1922 {
1923 uint16_t buf[6];
1924 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1925 return;
1926
1927 buf[0] = htons(0xC802); // flags/ver
1928 buf[1] = htons(12); // length
1929 buf[2] = htons(tunnel[t].far); // tunnel
1930 buf[3] = htons(0); // session
1931 buf[4] = htons(tunnel[t].ns); // sequence
1932 buf[5] = htons(tunnel[t].nr); // sequence
1933 tunnelsend((uint8_t *)buf, 12, t);
1934 }
1935
1936 // add a control message to a tunnel, and send if within window
1937 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1938 {
1939 uint16_t *pint16 = (uint16_t *) (c->buf + 2);
1940 pint16[0] = htons(c->length); // length
1941 pint16[1] = htons(tunnel[t].far); // tunnel
1942 pint16[2] = htons(far); // session
1943 pint16[3] = htons(tunnel[t].ns); // sequence
1944 tunnel[t].ns++; // advance sequence
1945 // link in message in to queue
1946 if (tunnel[t].controlc)
1947 tunnel[t].controle->next = c;
1948 else
1949 tunnel[t].controls = c;
1950
1951 tunnel[t].controle = c;
1952 tunnel[t].controlc++;
1953
1954 // send now if space in window
1955 if (tunnel[t].controlc <= tunnel[t].window)
1956 {
1957 tunnel[t].try = 0; // first send
1958 tunnelsend(c->buf, c->length, t);
1959 }
1960 }
1961
1962 //
1963 // Throttle or Unthrottle a session
1964 //
1965 // Throttle the data from/to through a session to no more than
1966 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1967 // user).
1968 //
1969 // If either value is -1, the current value is retained for that
1970 // direction.
1971 //
1972 void throttle_session(sessionidt s, int rate_in, int rate_out)
1973 {
1974 if (!session[s].opened)
1975 return; // No-one home.
1976
1977 if (!*session[s].user)
1978 return; // User not logged in
1979
1980 if (rate_in >= 0)
1981 {
1982 int bytes = rate_in * 1024 / 8; // kbits to bytes
1983 if (session[s].tbf_in)
1984 free_tbf(session[s].tbf_in);
1985
1986 if (rate_in > 0)
1987 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1988 else
1989 session[s].tbf_in = 0;
1990
1991 session[s].throttle_in = rate_in;
1992 }
1993
1994 if (rate_out >= 0)
1995 {
1996 int bytes = rate_out * 1024 / 8;
1997 if (session[s].tbf_out)
1998 free_tbf(session[s].tbf_out);
1999
2000 if (rate_out > 0)
2001 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
2002 else
2003 session[s].tbf_out = 0;
2004
2005 session[s].throttle_out = rate_out;
2006 }
2007 }
2008
2009 // add/remove filters from session (-1 = no change)
2010 void filter_session(sessionidt s, int filter_in, int filter_out)
2011 {
2012 if (!session[s].opened)
2013 return; // No-one home.
2014
2015 if (!*session[s].user)
2016 return; // User not logged in
2017
2018 // paranoia
2019 if (filter_in > MAXFILTER) filter_in = -1;
2020 if (filter_out > MAXFILTER) filter_out = -1;
2021 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2022 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2023
2024 if (filter_in >= 0)
2025 {
2026 if (session[s].filter_in)
2027 ip_filters[session[s].filter_in - 1].used--;
2028
2029 if (filter_in > 0)
2030 ip_filters[filter_in - 1].used++;
2031
2032 session[s].filter_in = filter_in;
2033 }
2034
2035 if (filter_out >= 0)
2036 {
2037 if (session[s].filter_out)
2038 ip_filters[session[s].filter_out - 1].used--;
2039
2040 if (filter_out > 0)
2041 ip_filters[filter_out - 1].used++;
2042
2043 session[s].filter_out = filter_out;
2044 }
2045 }
2046
2047 // start tidy shutdown of session
2048 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2049 {
2050 int walled_garden = session[s].walled_garden;
2051 bundleidt b = session[s].bundle;
2052 //delete routes only for last session in bundle (in case of MPPP)
2053 int del_routes = !b || (bundle[b].num_of_links == 1);
2054
2055 CSTAT(sessionshutdown);
2056
2057 if (!session[s].opened)
2058 {
2059 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2060 return; // not a live session
2061 }
2062
2063 if (!session[s].die)
2064 {
2065 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2066 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2067 run_plugins(PLUGIN_KILL_SESSION, &data);
2068 }
2069
2070 if (session[s].ip && !walled_garden && !session[s].die)
2071 {
2072 // RADIUS Stop message
2073 uint16_t r = radiusnew(s);
2074 if (r)
2075 {
2076 // stop, if not already trying
2077 if (radius[r].state != RADIUSSTOP)
2078 {
2079 radius[r].term_cause = term_cause;
2080 radius[r].term_msg = reason;
2081 radiussend(r, RADIUSSTOP);
2082 }
2083 }
2084 else
2085 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2086
2087 // Save counters to dump to accounting file
2088 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2089 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2090 }
2091
2092 if (!session[s].die)
2093 session[s].die = TIME + 150; // Clean up in 15 seconds
2094
2095 if (session[s].ip)
2096 { // IP allocated, clear and unroute
2097 int r;
2098 int routed = 0;
2099 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2100 {
2101 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2102 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2103 routed++;
2104
2105 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2106 session[s].route[r].ip = 0;
2107 }
2108
2109 if (session[s].ip_pool_index == -1) // static ip
2110 {
2111 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2112 session[s].ip = 0;
2113 }
2114 else
2115 free_ip_address(s);
2116
2117 // unroute IPv6, if setup
2118 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2119 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2120
2121 if (b)
2122 {
2123 // This session was part of a bundle
2124 bundle[b].num_of_links--;
2125 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2126 if(bundle[b].num_of_links == 0)
2127 {
2128 bundleclear(b);
2129 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2130 }
2131 else
2132 {
2133 // Adjust the members array to accomodate the new change
2134 uint8_t mem_num = 0;
2135 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2136 if(bundle[b].members[bundle[b].num_of_links] != s)
2137 {
2138 uint8_t ml;
2139 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2140 if(bundle[b].members[ml] == s)
2141 {
2142 mem_num = ml;
2143 break;
2144 }
2145 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2146 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2147
2148 // If the killed session is the first of the bundle,
2149 // the new first session must be stored in the cache_ipmap
2150 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2151 if (mem_num == 0)
2152 {
2153 sessionidt new_s = bundle[b].members[0];
2154
2155 routed = 0;
2156 // Add the route for this session.
2157 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2158 {
2159 int i, prefixlen;
2160 in_addr_t ip;
2161
2162 prefixlen = session[new_s].route[r].prefixlen;
2163 ip = session[new_s].route[r].ip;
2164
2165 if (!prefixlen) prefixlen = 32;
2166 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2167
2168 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2169 cache_ipmap(i, new_s);
2170 }
2171 cache_ipmap(session[new_s].ip, new_s);
2172
2173 // IPV6 route
2174 if (session[new_s].ipv6prefixlen)
2175 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2176 }
2177 }
2178 }
2179
2180 cluster_send_bundle(b);
2181 }
2182 }
2183
2184 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2185 throttle_session(s, 0, 0);
2186
2187 if (cdn_result)
2188 {
2189 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2190 {
2191 pppoe_shutdown_session(s);
2192 }
2193 else
2194 {
2195 // Send CDN
2196 controlt *c = controlnew(14); // sending CDN
2197 if (cdn_error)
2198 {
2199 uint16_t buf[2];
2200 buf[0] = htons(cdn_result);
2201 buf[1] = htons(cdn_error);
2202 controlb(c, 1, (uint8_t *)buf, 4, 1);
2203 }
2204 else
2205 control16(c, 1, cdn_result, 1);
2206
2207 control16(c, 14, s, 1); // assigned session (our end)
2208 controladd(c, session[s].far, session[s].tunnel); // send the message
2209 }
2210 }
2211
2212 // update filter refcounts
2213 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2214 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2215
2216 // clear PPP state
2217 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2218 sess_local[s].lcp.restart = 0;
2219 sess_local[s].ipcp.restart = 0;
2220 sess_local[s].ipv6cp.restart = 0;
2221 sess_local[s].ccp.restart = 0;
2222
2223 cluster_send_session(s);
2224 }
2225
2226 void sendipcp(sessionidt s, tunnelidt t)
2227 {
2228 uint8_t buf[MAXETHER];
2229 uint8_t *q;
2230
2231 CSTAT(sendipcp);
2232 LOG(3, s, t, "IPCP: send ConfigReq\n");
2233
2234 if (!session[s].unique_id)
2235 {
2236 if (!++last_id) ++last_id; // skip zero
2237 session[s].unique_id = last_id;
2238 }
2239
2240 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2241 if (!q) return;
2242
2243 *q = ConfigReq;
2244 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2245 *(uint16_t *) (q + 2) = htons(10); // packet length
2246 q[4] = 3; // ip address option
2247 q[5] = 6; // option length
2248 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2249 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2250 my_address; // send my IP
2251
2252 tunnelsend(buf, 10 + (q - buf), t); // send it
2253 restart_timer(s, ipcp);
2254 }
2255
2256 void sendipv6cp(sessionidt s, tunnelidt t)
2257 {
2258 uint8_t buf[MAXETHER];
2259 uint8_t *q;
2260
2261 CSTAT(sendipv6cp);
2262 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2263
2264 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2265 if (!q) return;
2266
2267 *q = ConfigReq;
2268 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2269 // only send one type
2270 // of request
2271 *(uint16_t *) (q + 2) = htons(14);
2272 q[4] = 1; // interface identifier option
2273 q[5] = 10; // option length
2274 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2275 *(uint32_t *) (q + 10) = 0;
2276 q[13] = 1;
2277
2278 tunnelsend(buf, 14 + (q - buf), t); // send it
2279 restart_timer(s, ipv6cp);
2280 }
2281
2282 static void sessionclear(sessionidt s)
2283 {
2284 memset(&session[s], 0, sizeof(session[s]));
2285 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2286 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2287
2288 session[s].tunnel = T_FREE; // Mark it as free.
2289 session[s].next = sessionfree;
2290 sessionfree = s;
2291 }
2292
2293 // kill a session now
2294 void sessionkill(sessionidt s, char *reason)
2295 {
2296 CSTAT(sessionkill);
2297
2298 if (!session[s].opened) // not alive
2299 return;
2300
2301 if (session[s].next)
2302 {
2303 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2304 return;
2305 }
2306
2307 if (!session[s].die)
2308 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2309
2310 if (sess_local[s].radius)
2311 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2312
2313 if (session[s].forwardtosession)
2314 {
2315 sessionidt sess = session[s].forwardtosession;
2316 if (session[sess].forwardtosession == s)
2317 {
2318 // Shutdown the linked session also.
2319 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2320 }
2321 }
2322
2323 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2324 sessionclear(s);
2325 cluster_send_session(s);
2326 }
2327
2328 static void tunnelclear(tunnelidt t)
2329 {
2330 if (!t) return;
2331 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2332 tunnel[t].state = TUNNELFREE;
2333 }
2334
2335 static void bundleclear(bundleidt b)
2336 {
2337 if (!b) return;
2338 memset(&bundle[b], 0, sizeof(bundle[b]));
2339 bundle[b].state = BUNDLEFREE;
2340 }
2341
2342 // kill a tunnel now
2343 static void tunnelkill(tunnelidt t, char *reason)
2344 {
2345 sessionidt s;
2346 controlt *c;
2347
2348 CSTAT(tunnelkill);
2349
2350 tunnel[t].state = TUNNELDIE;
2351
2352 // free control messages
2353 while ((c = tunnel[t].controls))
2354 {
2355 controlt * n = c->next;
2356 tunnel[t].controls = n;
2357 tunnel[t].controlc--;
2358 c->next = controlfree;
2359 controlfree = c;
2360 }
2361 // kill sessions
2362 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2363 if (session[s].tunnel == t)
2364 sessionkill(s, reason);
2365
2366 // free tunnel
2367 tunnelclear(t);
2368 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2369 cli_tunnel_actions[t].action = 0;
2370 cluster_send_tunnel(t);
2371 }
2372
2373 // shut down a tunnel cleanly
2374 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2375 {
2376 sessionidt s;
2377
2378 CSTAT(tunnelshutdown);
2379
2380 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2381 {
2382 // never set up, can immediately kill
2383 tunnelkill(t, reason);
2384 return;
2385 }
2386 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2387
2388 // close session
2389 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2390 if (session[s].tunnel == t)
2391 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2392
2393 tunnel[t].state = TUNNELDIE;
2394 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2395 cluster_send_tunnel(t);
2396 // TBA - should we wait for sessions to stop?
2397 if (result)
2398 {
2399 controlt *c = controlnew(4); // sending StopCCN
2400 if (error)
2401 {
2402 uint16_t buf[32];
2403 int l = 4;
2404 buf[0] = htons(result);
2405 buf[1] = htons(error);
2406 if (msg)
2407 {
2408 int m = strlen(msg);
2409 if (m + 4 > sizeof(buf))
2410 m = sizeof(buf) - 4;
2411
2412 memcpy(buf+2, msg, m);
2413 l += m;
2414 }
2415
2416 controlb(c, 1, (uint8_t *)buf, l, 1);
2417 }
2418 else
2419 control16(c, 1, result, 1);
2420
2421 control16(c, 9, t, 1); // assigned tunnel (our end)
2422 controladd(c, 0, t); // send the message
2423 }
2424 }
2425
2426 // read and process packet on tunnel (UDP)
2427 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2428 {
2429 uint8_t *sendchalresponse = NULL;
2430 uint8_t *recvchalresponse = NULL;
2431 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2432 uint8_t *p = buf + 2;
2433
2434
2435 CSTAT(processudp);
2436
2437 udp_rx += len;
2438 udp_rx_pkt++;
2439 LOG_HEX(5, "UDP Data", buf, len);
2440 STAT(tunnel_rx_packets);
2441 INC_STAT(tunnel_rx_bytes, len);
2442 if (len < 6)
2443 {
2444 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2445 STAT(tunnel_rx_errors);
2446 return;
2447 }
2448 if ((buf[1] & 0x0F) != 2)
2449 {
2450 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2451 STAT(tunnel_rx_errors);
2452 return;
2453 }
2454 if (*buf & 0x40)
2455 { // length
2456 l = ntohs(*(uint16_t *) p);
2457 p += 2;
2458 }
2459 t = ntohs(*(uint16_t *) p);
2460 p += 2;
2461 s = ntohs(*(uint16_t *) p);
2462 p += 2;
2463 if (s >= MAXSESSION)
2464 {
2465 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2466 STAT(tunnel_rx_errors);
2467 return;
2468 }
2469 if (t >= MAXTUNNEL)
2470 {
2471 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2472 STAT(tunnel_rx_errors);
2473 return;
2474 }
2475 if (t == TUNNEL_ID_PPPOE)
2476 {
2477 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2478 STAT(tunnel_rx_errors);
2479 return;
2480 }
2481 if (*buf & 0x08)
2482 { // ns/nr
2483 ns = ntohs(*(uint16_t *) p);
2484 p += 2;
2485 nr = ntohs(*(uint16_t *) p);
2486 p += 2;
2487 }
2488 if (*buf & 0x02)
2489 { // offset
2490 uint16_t o = ntohs(*(uint16_t *) p);
2491 p += o + 2;
2492 }
2493 if ((p - buf) > l)
2494 {
2495 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2496 STAT(tunnel_rx_errors);
2497 return;
2498 }
2499 l -= (p - buf);
2500
2501 // used to time out old tunnels
2502 if (t && tunnel[t].state == TUNNELOPEN)
2503 tunnel[t].lastrec = time_now;
2504
2505 if (*buf & 0x80)
2506 { // control
2507 uint16_t message = 0xFFFF; // message type
2508 uint8_t fatal = 0;
2509 uint8_t mandatory = 0;
2510 uint16_t asession = 0; // assigned session
2511 uint32_t amagic = 0; // magic number
2512 uint8_t aflags = 0; // flags from last LCF
2513 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2514 char called[MAXTEL] = ""; // called number
2515 char calling[MAXTEL] = ""; // calling number
2516
2517 if (!config->cluster_iam_master)
2518 {
2519 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2520 return;
2521 }
2522
2523 // control messages must have bits 0x80|0x40|0x08
2524 // (type, length and sequence) set, and bits 0x02|0x01
2525 // (offset and priority) clear
2526 if ((*buf & 0xCB) != 0xC8)
2527 {
2528 LOG(1, s, t, "Bad control header %02X\n", *buf);
2529 STAT(tunnel_rx_errors);
2530 return;
2531 }
2532
2533 // check for duplicate tunnel open message
2534 if (!t && ns == 0)
2535 {
2536 int i;
2537
2538 //
2539 // Is this a duplicate of the first packet? (SCCRQ)
2540 //
2541 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2542 {
2543 if (tunnel[i].state != TUNNELOPENING ||
2544 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2545 tunnel[i].port != ntohs(addr->sin_port) )
2546 continue;
2547 t = i;
2548 LOG(3, s, t, "Duplicate SCCRQ?\n");
2549 break;
2550 }
2551 }
2552
2553 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2554 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2555
2556 // if no tunnel specified, assign one
2557 if (!t)
2558 {
2559 if (!(t = new_tunnel()))
2560 {
2561 LOG(1, 0, 0, "No more tunnels\n");
2562 STAT(tunnel_overflow);
2563 return;
2564 }
2565 tunnelclear(t);
2566 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2567 tunnel[t].port = ntohs(addr->sin_port);
2568 tunnel[t].window = 4; // default window
2569 tunnel[t].indexudp = indexudpfd;
2570 STAT(tunnel_created);
2571 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2572 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2573 }
2574
2575 // If the 'ns' just received is not the 'nr' we're
2576 // expecting, just send an ack and drop it.
2577 //
2578 // if 'ns' is less, then we got a retransmitted packet.
2579 // if 'ns' is greater than missed a packet. Either way
2580 // we should ignore it.
2581 if (ns != tunnel[t].nr)
2582 {
2583 // is this the sequence we were expecting?
2584 STAT(tunnel_rx_errors);
2585 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2586 t, ns, tunnel[t].nr);
2587
2588 if (l) // Is this not a ZLB?
2589 controlnull(t);
2590 return;
2591 }
2592
2593 // check sequence of this message
2594 {
2595 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2596 // some to clear maybe?
2597 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2598 {
2599 controlt *c = tunnel[t].controls;
2600 tunnel[t].controls = c->next;
2601 tunnel[t].controlc--;
2602 c->next = controlfree;
2603 controlfree = c;
2604 skip--;
2605 tunnel[t].try = 0; // we have progress
2606 }
2607
2608 // receiver advance (do here so quoted correctly in any sends below)
2609 if (l) tunnel[t].nr = (ns + 1);
2610 if (skip < 0) skip = 0;
2611 if (skip < tunnel[t].controlc)
2612 {
2613 // some control packets can now be sent that were previous stuck out of window
2614 int tosend = tunnel[t].window - skip;
2615 controlt *c = tunnel[t].controls;
2616 while (c && skip)
2617 {
2618 c = c->next;
2619 skip--;
2620 }
2621 while (c && tosend)
2622 {
2623 tunnel[t].try = 0; // first send
2624 tunnelsend(c->buf, c->length, t);
2625 c = c->next;
2626 tosend--;
2627 }
2628 }
2629 if (!tunnel[t].controlc)
2630 tunnel[t].retry = 0; // caught up
2631 }
2632 if (l)
2633 { // if not a null message
2634 int result = 0;
2635 int error = 0;
2636 char *msg = 0;
2637
2638 // Default disconnect cause/message on receipt of CDN. Set to
2639 // more specific value from attribute 1 (result code) or 46
2640 // (disconnect cause) if present below.
2641 int disc_cause_set = 0;
2642 int disc_cause = TERM_NAS_REQUEST;
2643 char const *disc_reason = "Closed (Received CDN).";
2644
2645 // process AVPs
2646 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2647 {
2648 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2649 uint8_t *b = p;
2650 uint8_t flags = *p;
2651 uint16_t mtype;
2652
2653 if (n > l)
2654 {
2655 LOG(1, s, t, "Invalid length in AVP\n");
2656 STAT(tunnel_rx_errors);
2657 return;
2658 }
2659 p += n; // next
2660 l -= n;
2661 if (flags & 0x3C) // reserved bits, should be clear
2662 {
2663 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2664 fatal = flags;
2665 result = 2; // general error
2666 error = 3; // reserved field non-zero
2667 msg = 0;
2668 continue; // next
2669 }
2670 b += 2;
2671 if (*(uint16_t *) (b))
2672 {
2673 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2674 fatal = flags;
2675 result = 2; // general error
2676 error = 6; // generic vendor-specific error
2677 msg = "unsupported vendor-specific";
2678 continue; // next
2679 }
2680 b += 2;
2681 mtype = ntohs(*(uint16_t *) (b));
2682 b += 2;
2683 n -= 6;
2684
2685 if (flags & 0x40)
2686 {
2687 uint16_t orig_len;
2688
2689 // handle hidden AVPs
2690 if (!*config->l2tp_secret)
2691 {
2692 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2693 fatal = flags;
2694 result = 2; // general error
2695 error = 6; // generic vendor-specific error
2696 msg = "secret not specified";
2697 continue;
2698 }
2699 if (!session[s].random_vector_length)
2700 {
2701 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2702 fatal = flags;
2703 result = 2; // general error
2704 error = 6; // generic
2705 msg = "no random vector";
2706 continue;
2707 }
2708 if (n < 8)
2709 {
2710 LOG(2, s, t, "Short hidden AVP.\n");
2711 fatal = flags;
2712 result = 2; // general error
2713 error = 2; // length is wrong
2714 msg = 0;
2715 continue;
2716 }
2717
2718 // Unhide the AVP
2719 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2720
2721 orig_len = ntohs(*(uint16_t *) b);
2722 if (orig_len > n + 2)
2723 {
2724 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2725 orig_len, n);
2726
2727 fatal = flags;
2728 result = 2; // general error
2729 error = 2; // length is wrong
2730 msg = 0;
2731 continue;
2732 }
2733
2734 b += 2;
2735 n = orig_len;
2736 }
2737
2738 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2739 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2740
2741 switch (mtype)
2742 {
2743 case 0: // message type
2744 message = ntohs(*(uint16_t *) b);
2745 mandatory = flags & 0x80;
2746 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2747 break;
2748 case 1: // result code
2749 {
2750 uint16_t rescode = ntohs(*(uint16_t *) b);
2751 char const *resdesc = "(unknown)";
2752 char const *errdesc = NULL;
2753 int cause = 0;
2754
2755 if (message == 4)
2756 { /* StopCCN */
2757 resdesc = l2tp_stopccn_result_code(rescode);
2758 cause = TERM_LOST_SERVICE;
2759 }
2760 else if (message == 14)
2761 { /* CDN */
2762 resdesc = l2tp_cdn_result_code(rescode);
2763 if (rescode == 1)
2764 cause = TERM_LOST_CARRIER;
2765 else
2766 cause = TERM_ADMIN_RESET;
2767 }
2768
2769 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2770 if (n >= 4)
2771 {
2772 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2773 errdesc = l2tp_error_code(errcode);
2774 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2775 }
2776 if (n > 4)
2777 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2778
2779 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2780 {
2781 disc_cause_set = mtype;
2782 disc_reason = errdesc ? errdesc : resdesc;
2783 disc_cause = cause;
2784 }
2785
2786 break;
2787 }
2788 break;
2789 case 2: // protocol version
2790 {
2791 version = ntohs(*(uint16_t *) (b));
2792 LOG(4, s, t, " Protocol version = %u\n", version);
2793 if (version && version != 0x0100)
2794 { // allow 0.0 and 1.0
2795 LOG(1, s, t, " Bad protocol version %04X\n", version);
2796 fatal = flags;
2797 result = 5; // unspported protocol version
2798 error = 0x0100; // supported version
2799 msg = 0;
2800 continue; // next
2801 }
2802 }
2803 break;
2804 case 3: // framing capabilities
2805 break;
2806 case 4: // bearer capabilities
2807 break;
2808 case 5: // tie breaker
2809 // We never open tunnels, so we don't care about tie breakers
2810 continue;
2811 case 6: // firmware revision
2812 break;
2813 case 7: // host name
2814 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2815 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2816 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2817 // TBA - to send to RADIUS
2818 break;
2819 case 8: // vendor name
2820 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2821 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2822 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2823 break;
2824 case 9: // assigned tunnel
2825 tunnel[t].far = ntohs(*(uint16_t *) (b));
2826 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2827 break;
2828 case 10: // rx window
2829 tunnel[t].window = ntohs(*(uint16_t *) (b));
2830 if (!tunnel[t].window)
2831 tunnel[t].window = 1; // window of 0 is silly
2832 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2833 break;
2834 case 11: // Request Challenge
2835 {
2836 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2837 if (message == 1)
2838 build_chap_response(b, 2, n, &sendchalresponse);
2839 else if (message == 2)
2840 build_chap_response(b, 3, n, &sendchalresponse);
2841 }
2842 break;
2843 case 13: // receive challenge Response
2844 if (tunnel[t].isremotelns)
2845 {
2846 recvchalresponse = calloc(17, 1);
2847 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2848 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2849 }
2850 else
2851 // Why did they send a response? We never challenge.
2852 LOG(2, s, t, " received unexpected challenge response\n");
2853 break;
2854
2855 case 14: // assigned session
2856 asession = session[s].far = ntohs(*(uint16_t *) (b));
2857 LOG(4, s, t, " assigned session = %u\n", asession);
2858 break;
2859 case 15: // call serial number
2860 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2861 break;
2862 case 18: // bearer type
2863 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2864 // TBA - for RADIUS
2865 break;
2866 case 19: // framing type
2867 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2868 // TBA
2869 break;
2870 case 21: // called number
2871 memset(called, 0, sizeof(called));
2872 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2873 LOG(4, s, t, " Called <%s>\n", called);
2874 break;
2875 case 22: // calling number
2876 memset(calling, 0, sizeof(calling));
2877 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2878 LOG(4, s, t, " Calling <%s>\n", calling);
2879 break;
2880 case 23: // subtype
2881 break;
2882 case 24: // tx connect speed
2883 if (n == 4)
2884 {
2885 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2886 }
2887 else
2888 {
2889 // AS5300s send connect speed as a string
2890 char tmp[30];
2891 memset(tmp, 0, sizeof(tmp));
2892 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2893 session[s].tx_connect_speed = atol(tmp);
2894 }
2895 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2896 break;
2897 case 38: // rx connect speed
2898 if (n == 4)
2899 {
2900 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2901 }
2902 else
2903 {
2904 // AS5300s send connect speed as a string
2905 char tmp[30];
2906 memset(tmp, 0, sizeof(tmp));
2907 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2908 session[s].rx_connect_speed = atol(tmp);
2909 }
2910 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2911 break;
2912 case 25: // Physical Channel ID
2913 {
2914 uint32_t tmp = ntohl(*(uint32_t *) b);
2915 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2916 break;
2917 }
2918 case 29: // Proxy Authentication Type
2919 {
2920 uint16_t atype = ntohs(*(uint16_t *)b);
2921 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2922 break;
2923 }
2924 case 30: // Proxy Authentication Name
2925 {
2926 char authname[64];
2927 memset(authname, 0, sizeof(authname));
2928 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2929 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2930 authname);
2931 break;
2932 }
2933 case 31: // Proxy Authentication Challenge
2934 {
2935 LOG(4, s, t, " Proxy Auth Challenge\n");
2936 break;
2937 }
2938 case 32: // Proxy Authentication ID
2939 {
2940 uint16_t authid = ntohs(*(uint16_t *)(b));
2941 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2942 break;
2943 }
2944 case 33: // Proxy Authentication Response
2945 LOG(4, s, t, " Proxy Auth Response\n");
2946 break;
2947 case 27: // last sent lcp
2948 { // find magic number
2949 uint8_t *p = b, *e = p + n;
2950 while (p + 1 < e && p[1] && p + p[1] <= e)
2951 {
2952 if (*p == 5 && p[1] == 6) // Magic-Number
2953 amagic = ntohl(*(uint32_t *) (p + 2));
2954 else if (*p == 7) // Protocol-Field-Compression
2955 aflags |= SESSION_PFC;
2956 else if (*p == 8) // Address-and-Control-Field-Compression
2957 aflags |= SESSION_ACFC;
2958 p += p[1];
2959 }
2960 }
2961 break;
2962 case 28: // last recv lcp confreq
2963 break;
2964 case 26: // Initial Received LCP CONFREQ
2965 break;
2966 case 39: // seq required - we control it as an LNS anyway...
2967 break;
2968 case 36: // Random Vector
2969 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2970 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2971 if (n > sizeof(session[s].random_vector))
2972 n = sizeof(session[s].random_vector);
2973 memcpy(session[s].random_vector, b, n);
2974 session[s].random_vector_length = n;
2975 break;
2976 case 46: // ppp disconnect cause
2977 if (n >= 5)
2978 {
2979 uint16_t code = ntohs(*(uint16_t *) b);
2980 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2981 uint8_t dir = *(b + 4);
2982
2983 LOG(4, s, t, " PPP disconnect cause "
2984 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2985 code, proto, dir, n - 5, b + 5);
2986
2987 disc_cause_set = mtype;
2988
2989 switch (code)
2990 {
2991 case 1: // admin disconnect
2992 disc_cause = TERM_ADMIN_RESET;
2993 disc_reason = "Administrative disconnect";
2994 break;
2995 case 3: // lcp terminate
2996 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2997 disc_cause = TERM_USER_REQUEST;
2998 disc_reason = "Normal disconnection";
2999 break;
3000 case 4: // compulsory encryption unavailable
3001 if (dir != 1) break; // 1=refused by peer, 2=local
3002 disc_cause = TERM_USER_ERROR;
3003 disc_reason = "Compulsory encryption refused";
3004 break;
3005 case 5: // lcp: fsm timeout
3006 disc_cause = TERM_PORT_ERROR;
3007 disc_reason = "LCP: FSM timeout";
3008 break;
3009 case 6: // lcp: no recognisable lcp packets received
3010 disc_cause = TERM_PORT_ERROR;
3011 disc_reason = "LCP: no recognisable LCP packets";
3012 break;
3013 case 7: // lcp: magic-no error (possibly looped back)
3014 disc_cause = TERM_PORT_ERROR;
3015 disc_reason = "LCP: magic-no error (possible loop)";
3016 break;
3017 case 8: // lcp: echo request timeout
3018 disc_cause = TERM_PORT_ERROR;
3019 disc_reason = "LCP: echo request timeout";
3020 break;
3021 case 13: // auth: fsm timeout
3022 disc_cause = TERM_SERVICE_UNAVAILABLE;
3023 disc_reason = "Authentication: FSM timeout";
3024 break;
3025 case 15: // auth: unacceptable auth protocol
3026 disc_cause = TERM_SERVICE_UNAVAILABLE;
3027 disc_reason = "Unacceptable authentication protocol";
3028 break;
3029 case 16: // auth: authentication failed
3030 disc_cause = TERM_SERVICE_UNAVAILABLE;
3031 disc_reason = "Authentication failed";
3032 break;
3033 case 17: // ncp: fsm timeout
3034 disc_cause = TERM_SERVICE_UNAVAILABLE;
3035 disc_reason = "NCP: FSM timeout";
3036 break;
3037 case 18: // ncp: no ncps available
3038 disc_cause = TERM_SERVICE_UNAVAILABLE;
3039 disc_reason = "NCP: no NCPs available";
3040 break;
3041 case 19: // ncp: failure to converge on acceptable address
3042 disc_cause = TERM_SERVICE_UNAVAILABLE;
3043 disc_reason = (dir == 1)
3044 ? "NCP: too many Configure-Naks received from peer"
3045 : "NCP: too many Configure-Naks sent to peer";
3046 break;
3047 case 20: // ncp: user not permitted to use any address
3048 disc_cause = TERM_SERVICE_UNAVAILABLE;
3049 disc_reason = (dir == 1)
3050 ? "NCP: local link address not acceptable to peer"
3051 : "NCP: remote link address not acceptable";
3052 break;
3053 }
3054 }
3055 break;
3056 default:
3057 {
3058 static char e[] = "unknown AVP 0xXXXX";
3059 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3060 fatal = flags;
3061 result = 2; // general error
3062 error = 8; // unknown mandatory AVP
3063 sprintf((msg = e) + 14, "%04x", mtype);
3064 continue; // next
3065 }
3066 }
3067 }
3068 // process message
3069 if (fatal & 0x80)
3070 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3071 else
3072 switch (message)
3073 {
3074 case 1: // SCCRQ - Start Control Connection Request
3075 tunnel[t].state = TUNNELOPENING;
3076 LOG(3, s, t, "Received SCCRQ\n");
3077 if (main_quit != QUIT_SHUTDOWN)
3078 {
3079 LOG(3, s, t, "sending SCCRP\n");
3080 controlt *c = controlnew(2); // sending SCCRP
3081 control16(c, 2, version, 1); // protocol version
3082 control32(c, 3, 3, 1); // framing
3083 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3084 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3085 control16(c, 9, t, 1); // assigned tunnel
3086 controladd(c, 0, t); // send the resply
3087 }
3088 else
3089 {
3090 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3091 }
3092 break;
3093 case 2: // SCCRP
3094 tunnel[t].state = TUNNELOPEN;
3095 tunnel[t].lastrec = time_now;
3096 LOG(3, s, t, "Received SCCRP\n");
3097 if (main_quit != QUIT_SHUTDOWN)
3098 {
3099 if (tunnel[t].isremotelns && recvchalresponse)
3100 {
3101 hasht hash;
3102
3103 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3104 // check authenticator
3105 if (memcmp(hash, recvchalresponse, 16) == 0)
3106 {
3107 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3108 controlt *c = controlnew(3); // sending SCCCN
3109 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3110 controls(c, 8, Vendor_name, 1); // Vendor name
3111 control16(c, 2, version, 1); // protocol version
3112 control32(c, 3, 3, 1); // framing Capabilities
3113 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3114 control16(c, 9, t, 1); // assigned tunnel
3115 controladd(c, 0, t); // send
3116 }
3117 else
3118 {
3119 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3120 }
3121 }
3122 }
3123 else
3124 {
3125 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3126 }
3127 break;
3128 case 3: // SCCN
3129 LOG(3, s, t, "Received SCCN\n");
3130 tunnel[t].state = TUNNELOPEN;
3131 tunnel[t].lastrec = time_now;
3132 controlnull(t); // ack
3133 break;
3134 case 4: // StopCCN
3135 LOG(3, s, t, "Received StopCCN\n");
3136 controlnull(t); // ack
3137 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3138 break;
3139 case 6: // HELLO
3140 LOG(3, s, t, "Received HELLO\n");
3141 controlnull(t); // simply ACK
3142 break;
3143 case 7: // OCRQ
3144 // TBA
3145 LOG(3, s, t, "Received OCRQ\n");
3146 break;
3147 case 8: // OCRO
3148 // TBA
3149 LOG(3, s, t, "Received OCRO\n");
3150 break;
3151 case 9: // OCCN
3152 // TBA
3153 LOG(3, s, t, "Received OCCN\n");
3154 break;
3155 case 10: // ICRQ
3156 LOG(3, s, t, "Received ICRQ\n");
3157 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3158 {
3159 controlt *c = controlnew(11); // ICRP
3160
3161 LOG(3, s, t, "Sending ICRP\n");
3162
3163 s = sessionfree;
3164 sessionfree = session[s].next;
3165 memset(&session[s], 0, sizeof(session[s]));
3166
3167 if (s > config->cluster_highest_sessionid)
3168 config->cluster_highest_sessionid = s;
3169
3170 session[s].opened = time_now;
3171 session[s].tunnel = t;
3172 session[s].far = asession;
3173 session[s].last_packet = session[s].last_data = time_now;
3174 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3175 control16(c, 14, s, 1); // assigned session
3176 controladd(c, asession, t); // send the reply
3177
3178 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3179 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3180
3181 session[s].ppp.phase = Establish;
3182 session[s].ppp.lcp = Starting;
3183
3184 STAT(session_created);
3185 break;
3186 }
3187
3188 {
3189 controlt *c = controlnew(14); // CDN
3190 LOG(3, s, t, "Sending CDN\n");
3191 if (!sessionfree)
3192 {
3193 STAT(session_overflow);
3194 LOG(1, 0, t, "No free sessions\n");
3195 control16(c, 1, 4, 0); // temporary lack of resources
3196 }
3197 else
3198 control16(c, 1, 2, 7); // shutting down, try another
3199
3200 controladd(c, asession, t); // send the message
3201 }
3202 return;
3203 case 11: // ICRP
3204 LOG(3, s, t, "Received ICRP\n");
3205 if (session[s].forwardtosession)
3206 {
3207 controlt *c = controlnew(12); // ICCN
3208
3209 session[s].opened = time_now;
3210 session[s].tunnel = t;
3211 session[s].far = asession;
3212 session[s].last_packet = session[s].last_data = time_now;
3213
3214 control32(c, 19, 1, 1); // Framing Type
3215 control32(c, 24, 10000000, 1); // Tx Connect Speed
3216 controladd(c, asession, t); // send the message
3217 LOG(3, s, t, "Sending ICCN\n");
3218 }
3219 break;
3220 case 12: // ICCN
3221 LOG(3, s, t, "Received ICCN\n");
3222 if (amagic == 0) amagic = time_now;
3223 session[s].magic = amagic; // set magic number
3224 session[s].flags = aflags; // set flags received
3225 session[s].mru = PPPoE_MRU; // default
3226 controlnull(t); // ack
3227
3228 // start LCP
3229 sess_local[s].lcp_authtype = config->radius_authprefer;
3230 sess_local[s].ppp_mru = MRU;
3231
3232 // Set multilink options before sending initial LCP packet
3233 sess_local[s].mp_mrru = 1614;
3234 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3235
3236 sendlcp(s, t);
3237 change_state(s, lcp, RequestSent);
3238 break;
3239
3240 case 14: // CDN
3241 LOG(3, s, t, "Received CDN\n");
3242 controlnull(t); // ack
3243 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3244 break;
3245 case 0xFFFF:
3246 LOG(1, s, t, "Missing message type\n");
3247 break;
3248 default:
3249 STAT(tunnel_rx_errors);
3250 if (mandatory)
3251 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3252 else
3253 LOG(1, s, t, "Unknown message type %u\n", message);
3254 break;
3255 }
3256 if (sendchalresponse) free(sendchalresponse);
3257 if (recvchalresponse) free(recvchalresponse);
3258 cluster_send_tunnel(t);
3259 }
3260 else
3261 {
3262 LOG(4, s, t, " Got a ZLB ack\n");
3263 }
3264 }
3265 else
3266 { // data
3267 uint16_t proto;
3268
3269 LOG_HEX(5, "Receive Tunnel Data", p, l);
3270 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3271 { // HDLC address header, discard
3272 p += 2;
3273 l -= 2;
3274 }
3275 if (l < 2)
3276 {
3277 LOG(1, s, t, "Short ppp length %d\n", l);
3278 STAT(tunnel_rx_errors);
3279 return;
3280 }
3281 if (*p & 1)
3282 {
3283 proto = *p++;
3284 l--;
3285 }
3286 else
3287 {
3288 proto = ntohs(*(uint16_t *) p);
3289 p += 2;
3290 l -= 2;
3291 }
3292
3293 if (session[s].forwardtosession)
3294 {
3295 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3296 // Forward to LAC/BAS or Remote LNS session
3297 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3298 return;
3299 }
3300 else if (config->auth_tunnel_change_addr_src)
3301 {
3302 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3303 tunnel[t].port == ntohs(addr->sin_port))
3304 {
3305 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3306 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3307 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3308
3309 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3310 }
3311 }
3312
3313 if (s && !session[s].opened) // Is something wrong??
3314 {
3315 if (!config->cluster_iam_master)
3316 {
3317 // Pass it off to the master to deal with..
3318 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3319 return;
3320 }
3321
3322 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3323 STAT(tunnel_rx_errors);
3324 return;
3325 }
3326
3327 if (proto == PPPPAP)
3328 {
3329 session[s].last_packet = time_now;
3330 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3331 processpap(s, t, p, l);
3332 }
3333 else if (proto == PPPCHAP)
3334 {
3335 session[s].last_packet = time_now;
3336 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3337 processchap(s, t, p, l);
3338 }
3339 else if (proto == PPPLCP)
3340 {
3341 session[s].last_packet = time_now;
3342 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3343 processlcp(s, t, p, l);
3344 }
3345 else if (proto == PPPIPCP)
3346 {
3347 session[s].last_packet = time_now;
3348 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3349 processipcp(s, t, p, l);
3350 }
3351 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3352 {
3353 session[s].last_packet = time_now;
3354 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3355 processipv6cp(s, t, p, l);
3356 }
3357 else if (proto == PPPCCP)
3358 {
3359 session[s].last_packet = time_now;
3360 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3361 processccp(s, t, p, l);
3362 }
3363 else if (proto == PPPIP)
3364 {
3365 if (session[s].die)
3366 {
3367 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3368 return; // closing session, PPP not processed
3369 }
3370
3371 session[s].last_packet = session[s].last_data = time_now;
3372 if (session[s].walled_garden && !config->cluster_iam_master)
3373 {
3374 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3375 return;
3376 }
3377
3378 processipin(s, t, p, l);
3379 }
3380 else if (proto == PPPMP)
3381 {
3382 if (session[s].die)
3383 {
3384 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3385 return; // closing session, PPP not processed
3386 }
3387
3388 session[s].last_packet = session[s].last_data = time_now;
3389 if (!config->cluster_iam_master)
3390 {
3391 // The fragments reconstruction is managed by the Master.
3392 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3393 return;
3394 }
3395
3396 processmpin(s, t, p, l);
3397 }
3398 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3399 {
3400 if (session[s].die)
3401 {
3402 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3403 return; // closing session, PPP not processed
3404 }
3405
3406 session[s].last_packet = session[s].last_data = time_now;
3407 if (session[s].walled_garden && !config->cluster_iam_master)
3408 {
3409 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3410 return;
3411 }
3412
3413 processipv6in(s, t, p, l);
3414 }
3415 else if (session[s].ppp.lcp == Opened)
3416 {
3417 session[s].last_packet = time_now;
3418 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3419 protoreject(s, t, p, l, proto);
3420 }
3421 else
3422 {
3423 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3424 proto, ppp_state(session[s].ppp.lcp));
3425 }
3426 }
3427 }
3428
3429 // read and process packet on tun
3430 // (i.e. this routine writes to buf[-8]).
3431 static void processtun(uint8_t * buf, int len)
3432 {
3433 LOG_HEX(5, "Receive TUN Data", buf, len);
3434 STAT(tun_rx_packets);
3435 INC_STAT(tun_rx_bytes, len);
3436
3437 CSTAT(processtun);
3438
3439 eth_rx_pkt++;
3440 eth_rx += len;
3441 if (len < 22)
3442 {
3443 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3444 STAT(tun_rx_errors);
3445 return;
3446 }
3447
3448 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3449 processipout(buf, len);
3450 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3451 && config->ipv6_prefix.s6_addr[0])
3452 processipv6out(buf, len);
3453
3454 // Else discard.
3455 }
3456
3457 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3458 // that we look at the whole of the tunnel, radius and session tables
3459 // every second
3460 static void regular_cleanups(double period)
3461 {
3462 // Next tunnel, radius and session to check for actions on.
3463 static tunnelidt t = 0;
3464 static int r = 0;
3465 static sessionidt s = 0;
3466
3467 int t_actions = 0;
3468 int r_actions = 0;
3469 int s_actions = 0;
3470
3471 int t_slice;
3472 int r_slice;
3473 int s_slice;
3474
3475 int i;
3476 int a;
3477
3478 // divide up tables into slices based on the last run
3479 t_slice = config->cluster_highest_tunnelid * period;
3480 r_slice = (MAXRADIUS - 1) * period;
3481 s_slice = config->cluster_highest_sessionid * period;
3482
3483 if (t_slice < 1)
3484 t_slice = 1;
3485 else if (t_slice > config->cluster_highest_tunnelid)
3486 t_slice = config->cluster_highest_tunnelid;
3487
3488 if (r_slice < 1)
3489 r_slice = 1;
3490 else if (r_slice > (MAXRADIUS - 1))
3491 r_slice = MAXRADIUS - 1;
3492
3493 if (s_slice < 1)
3494 s_slice = 1;
3495 else if (s_slice > config->cluster_highest_sessionid)
3496 s_slice = config->cluster_highest_sessionid;
3497
3498 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3499
3500 for (i = 0; i < t_slice; i++)
3501 {
3502 t++;
3503 if (t > config->cluster_highest_tunnelid)
3504 t = 1;
3505
3506 if (t == TUNNEL_ID_PPPOE)
3507 continue;
3508
3509 // check for expired tunnels
3510 if (tunnel[t].die && tunnel[t].die <= TIME)
3511 {
3512 STAT(tunnel_timeout);
3513 tunnelkill(t, "Expired");
3514 t_actions++;
3515 continue;
3516 }
3517 // check for message resend
3518 if (tunnel[t].retry && tunnel[t].controlc)
3519 {
3520 // resend pending messages as timeout on reply
3521 if (tunnel[t].retry <= TIME)
3522 {
3523 controlt *c = tunnel[t].controls;
3524 uint16_t w = tunnel[t].window;
3525 tunnel[t].try++; // another try
3526 if (tunnel[t].try > 5)
3527 tunnelkill(t, "Timeout on control message"); // game over
3528 else
3529 while (c && w--)
3530 {
3531 tunnelsend(c->buf, c->length, t);
3532 c = c->next;
3533 }
3534
3535 t_actions++;
3536 }
3537 }
3538 // Send hello
3539 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3540 {
3541 if (!config->disable_sending_hello)
3542 {
3543 controlt *c = controlnew(6); // sending HELLO
3544 controladd(c, 0, t); // send the message
3545 LOG(3, 0, t, "Sending HELLO message\n");
3546 t_actions++;
3547 }
3548 }
3549
3550 // Check for tunnel changes requested from the CLI
3551 if ((a = cli_tunnel_actions[t].action))
3552 {
3553 cli_tunnel_actions[t].action = 0;
3554 if (a & CLI_TUN_KILL)
3555 {
3556 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3557 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3558 t_actions++;
3559 }
3560 }
3561 }
3562
3563 for (i = 0; i < r_slice; i++)
3564 {
3565 r++;
3566 if (r >= MAXRADIUS)
3567 r = 1;
3568
3569 if (!radius[r].state)
3570 continue;
3571
3572 if (radius[r].retry <= TIME)
3573 {
3574 radiusretry(r);
3575 r_actions++;
3576 }
3577 }
3578
3579 for (i = 0; i < s_slice; i++)
3580 {
3581 s++;
3582 if (s > config->cluster_highest_sessionid)
3583 s = 1;
3584
3585 if (!session[s].opened) // Session isn't in use
3586 continue;
3587
3588 // check for expired sessions
3589 if (session[s].die)
3590 {
3591 if (session[s].die <= TIME)
3592 {
3593 sessionkill(s, "Expired");
3594 s_actions++;
3595 }
3596 continue;
3597 }
3598
3599 // PPP timeouts
3600 if (sess_local[s].lcp.restart <= time_now)
3601 {
3602 int next_state = session[s].ppp.lcp;
3603 switch (session[s].ppp.lcp)
3604 {
3605 case RequestSent:
3606 case AckReceived:
3607 next_state = RequestSent;
3608
3609 case AckSent:
3610 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3611 {
3612 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3613 sendlcp(s, session[s].tunnel);
3614 change_state(s, lcp, next_state);
3615 }
3616 else
3617 {
3618 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3619 STAT(session_timeout);
3620 }
3621
3622 s_actions++;
3623 }
3624
3625 if (session[s].die)
3626 continue;
3627 }
3628
3629 if (sess_local[s].ipcp.restart <= time_now)
3630 {
3631 int next_state = session[s].ppp.ipcp;
3632 switch (session[s].ppp.ipcp)
3633 {
3634 case RequestSent:
3635 case AckReceived:
3636 next_state = RequestSent;
3637
3638 case AckSent:
3639 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3640 {
3641 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3642 sendipcp(s, session[s].tunnel);
3643 change_state(s, ipcp, next_state);
3644 }
3645 else
3646 {
3647 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3648 STAT(session_timeout);
3649 }
3650
3651 s_actions++;
3652 }
3653
3654 if (session[s].die)
3655 continue;
3656 }
3657
3658 if (sess_local[s].ipv6cp.restart <= time_now)
3659 {
3660 int next_state = session[s].ppp.ipv6cp;
3661 switch (session[s].ppp.ipv6cp)
3662 {
3663 case RequestSent:
3664 case AckReceived:
3665 next_state = RequestSent;
3666
3667 case AckSent:
3668 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3669 {
3670 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3671 sendipv6cp(s, session[s].tunnel);
3672 change_state(s, ipv6cp, next_state);
3673 }
3674 else
3675 {
3676 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3677 change_state(s, ipv6cp, Stopped);
3678 }
3679
3680 s_actions++;
3681 }
3682 }
3683
3684 if (sess_local[s].ccp.restart <= time_now)
3685 {
3686 int next_state = session[s].ppp.ccp;
3687 switch (session[s].ppp.ccp)
3688 {
3689 case RequestSent:
3690 case AckReceived:
3691 next_state = RequestSent;
3692
3693 case AckSent:
3694 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3695 {
3696 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3697 sendccp(s, session[s].tunnel);
3698 change_state(s, ccp, next_state);
3699 }
3700 else
3701 {
3702 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3703 change_state(s, ccp, Stopped);
3704 }
3705
3706 s_actions++;
3707 }
3708 }
3709
3710 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3711 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3712 {
3713 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3714 STAT(session_timeout);
3715 s_actions++;
3716 continue;
3717 }
3718
3719 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3720 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3721 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3722 {
3723 uint8_t b[MAXETHER];
3724
3725 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3726 if (!q) continue;
3727
3728 *q = EchoReq;
3729 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3730 *(uint16_t *)(q + 2) = htons(8); // Length
3731 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3732
3733 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3734 (int)(time_now - session[s].last_packet));
3735
3736 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3737 sess_local[s].last_echo = time_now;
3738 s_actions++;
3739 }
3740
3741 // Drop sessions who have reached session_timeout seconds
3742 if (session[s].session_timeout)
3743 {
3744 bundleidt bid = session[s].bundle;
3745 if (bid)
3746 {
3747 if (time_now - bundle[bid].last_check >= 1)
3748 {
3749 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3750 bundle[bid].last_check = time_now;
3751 if (bundle[bid].online_time >= session[s].session_timeout)
3752 {
3753 int ses;
3754 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3755 {
3756 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3757 s_actions++;
3758 continue;
3759 }
3760 }
3761 }
3762 }
3763 else if (time_now - session[s].opened >= session[s].session_timeout)
3764 {
3765 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3766 s_actions++;
3767 continue;
3768 }
3769 }
3770
3771 // Drop sessions who have reached idle_timeout seconds
3772 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3773 {
3774 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3775 STAT(session_timeout);
3776 s_actions++;
3777 continue;
3778 }
3779
3780 // Check for actions requested from the CLI
3781 if ((a = cli_session_actions[s].action))
3782 {
3783 int send = 0;
3784
3785 cli_session_actions[s].action = 0;
3786 if (a & CLI_SESS_KILL)
3787 {
3788 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3789 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3790 a = 0; // dead, no need to check for other actions
3791 s_actions++;
3792 }
3793
3794 if (a & CLI_SESS_NOSNOOP)
3795 {
3796 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3797 session[s].snoop_ip = 0;
3798 session[s].snoop_port = 0;
3799 s_actions++;
3800 send++;
3801 }
3802 else if (a & CLI_SESS_SNOOP)
3803 {
3804 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3805 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3806 cli_session_actions[s].snoop_port);
3807
3808 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3809 session[s].snoop_port = cli_session_actions[s].snoop_port;
3810 s_actions++;
3811 send++;
3812 }
3813
3814 if (a & CLI_SESS_NOTHROTTLE)
3815 {
3816 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3817 throttle_session(s, 0, 0);
3818 s_actions++;
3819 send++;
3820 }
3821 else if (a & CLI_SESS_THROTTLE)
3822 {
3823 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3824 cli_session_actions[s].throttle_in,
3825 cli_session_actions[s].throttle_out);
3826
3827 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3828 s_actions++;
3829 send++;
3830 }
3831
3832 if (a & CLI_SESS_NOFILTER)
3833 {
3834 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3835 filter_session(s, 0, 0);
3836 s_actions++;
3837 send++;
3838 }
3839 else if (a & CLI_SESS_FILTER)
3840 {
3841 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3842 cli_session_actions[s].filter_in,
3843 cli_session_actions[s].filter_out);
3844
3845 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3846 s_actions++;
3847 send++;
3848 }
3849
3850 if (send)
3851 cluster_send_session(s);
3852 }
3853
3854 // RADIUS interim accounting
3855 if (config->radius_accounting && config->radius_interim > 0
3856 && session[s].ip && !session[s].walled_garden
3857 && !sess_local[s].radius // RADIUS already in progress
3858 && time_now - sess_local[s].last_interim >= config->radius_interim
3859 && session[s].flags & SESSION_STARTED)
3860 {
3861 int rad = radiusnew(s);
3862 if (!rad)
3863 {
3864 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3865 STAT(radius_overflow);
3866 continue;
3867 }
3868
3869 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3870 session[s].user, session[s].unique_id);
3871
3872 radiussend(rad, RADIUSINTERIM);
3873 sess_local[s].last_interim = time_now;
3874 s_actions++;
3875 }
3876 }
3877
3878 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3879 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3880 }
3881
3882 //
3883 // Are we in the middle of a tunnel update, or radius
3884 // requests??
3885 //
3886 static int still_busy(void)
3887 {
3888 int i;
3889 static clockt last_talked = 0;
3890 static clockt start_busy_wait = 0;
3891
3892 #ifdef BGP
3893 static time_t stopped_bgp = 0;
3894 if (bgp_configured)
3895 {
3896 if (!stopped_bgp)
3897 {
3898 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3899
3900 for (i = 0; i < BGP_NUM_PEERS; i++)
3901 if (bgp_peers[i].state == Established)
3902 bgp_stop(&bgp_peers[i]);
3903
3904 stopped_bgp = time_now;
3905
3906 if (!config->cluster_iam_master)
3907 {
3908 // we don't want to become master
3909 cluster_send_ping(0);
3910
3911 return 1;
3912 }
3913 }
3914
3915 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3916 return 1;
3917 }
3918 #endif /* BGP */
3919
3920 if (!config->cluster_iam_master)
3921 return 0;
3922
3923 if (main_quit == QUIT_SHUTDOWN)
3924 {
3925 static int dropped = 0;
3926 if (!dropped)
3927 {
3928 int i;
3929
3930 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3931 for (i = 1; i < MAXTUNNEL; i++)
3932 if (tunnel[i].ip || tunnel[i].state)
3933 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3934
3935 dropped = 1;
3936 }
3937 }
3938
3939 if (start_busy_wait == 0)
3940 start_busy_wait = TIME;
3941
3942 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3943 {
3944 if (!tunnel[i].controlc)
3945 continue;
3946
3947 if (last_talked != TIME)
3948 {
3949 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3950 last_talked = TIME;
3951 }
3952 return 1;
3953 }
3954
3955 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3956 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3957 {
3958 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3959 return 0;
3960 }
3961
3962 for (i = 1; i < MAXRADIUS; i++)
3963 {
3964 if (radius[i].state == RADIUSNULL)
3965 continue;
3966 if (radius[i].state == RADIUSWAIT)
3967 continue;
3968
3969 if (last_talked != TIME)
3970 {
3971 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3972 last_talked = TIME;
3973 }
3974 return 1;
3975 }
3976
3977 return 0;
3978 }
3979
3980 #ifdef HAVE_EPOLL
3981 # include <sys/epoll.h>
3982 #else
3983 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3984 # include "fake_epoll.h"
3985 #endif
3986
3987 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
3988 #define BASE_FDS (9 + MAX_UDPFD)
3989
3990 // additional polled fds
3991 #ifdef BGP
3992 # define EXTRA_FDS BGP_NUM_PEERS
3993 #else
3994 # define EXTRA_FDS 0
3995 #endif
3996
3997 // main loop - gets packets on tun or udp and processes them
3998 static void mainloop(void)
3999 {
4000 int i, j;
4001 uint8_t buf[65536];
4002 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4003 // and the forwarded pppoe session
4004 int size_bufp = sizeof(buf) - 32;
4005 clockt next_cluster_ping = 0; // send initial ping immediately
4006 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4007 int maxevent = sizeof(events)/sizeof(*events);
4008
4009 if ((epollfd = epoll_create(maxevent)) < 0)
4010 {
4011 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4012 exit(1);
4013 }
4014
4015 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",
4016 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4017
4018 /* setup our fds to poll for input */
4019 {
4020 static struct event_data d[BASE_FDS];
4021 struct epoll_event e;
4022
4023 e.events = EPOLLIN;
4024 i = 0;
4025
4026 if (clifd >= 0)
4027 {
4028 d[i].type = FD_TYPE_CLI;
4029 e.data.ptr = &d[i++];
4030 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4031 }
4032
4033 d[i].type = FD_TYPE_CLUSTER;
4034 e.data.ptr = &d[i++];
4035 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4036
4037 d[i].type = FD_TYPE_TUN;
4038 e.data.ptr = &d[i++];
4039 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4040
4041 d[i].type = FD_TYPE_CONTROL;
4042 e.data.ptr = &d[i++];
4043 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4044
4045 d[i].type = FD_TYPE_DAE;
4046 e.data.ptr = &d[i++];
4047 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4048
4049 d[i].type = FD_TYPE_NETLINK;
4050 e.data.ptr = &d[i++];
4051 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4052
4053 d[i].type = FD_TYPE_PPPOEDISC;
4054 e.data.ptr = &d[i++];
4055 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4056
4057 d[i].type = FD_TYPE_PPPOESESS;
4058 e.data.ptr = &d[i++];
4059 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4060
4061 for (j = 0; j < config->nbudpfd; j++)
4062 {
4063 d[i].type = FD_TYPE_UDP;
4064 d[i].index = j;
4065 e.data.ptr = &d[i++];
4066 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4067 }
4068 }
4069
4070 #ifdef BGP
4071 signal(SIGPIPE, SIG_IGN);
4072 bgp_setup(config->as_number);
4073 if (config->bind_address)
4074 bgp_add_route(config->bind_address, 0xffffffff);
4075
4076 for (i = 0; i < BGP_NUM_PEERS; i++)
4077 {
4078 if (config->neighbour[i].name[0])
4079 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4080 config->neighbour[i].as, config->neighbour[i].keepalive,
4081 config->neighbour[i].hold, config->neighbour[i].update_source,
4082 0); /* 0 = routing disabled */
4083 }
4084 #endif /* BGP */
4085
4086 while (!main_quit || still_busy())
4087 {
4088 int more = 0;
4089 int n;
4090
4091
4092 if (main_reload)
4093 {
4094 main_reload = 0;
4095 read_config_file();
4096 config->reload_config++;
4097 }
4098
4099 if (config->reload_config)
4100 {
4101 config->reload_config = 0;
4102 update_config();
4103 }
4104
4105 #ifdef BGP
4106 bgp_set_poll();
4107 #endif /* BGP */
4108
4109 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4110 STAT(select_called);
4111
4112 TIME = now(NULL);
4113 if (n < 0)
4114 {
4115 if (errno == EINTR ||
4116 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4117 continue;
4118
4119 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4120 break; // exit
4121 }
4122
4123 if (n)
4124 {
4125 struct sockaddr_in addr;
4126 struct in_addr local;
4127 socklen_t alen;
4128 int c, s;
4129 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4130 int pppoesess_ready = 0;
4131 int pppoesess_pkts = 0;
4132 int tun_ready = 0;
4133 int cluster_ready = 0;
4134 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4135 int tun_pkts = 0;
4136 int cluster_pkts = 0;
4137 #ifdef BGP
4138 uint32_t bgp_events[BGP_NUM_PEERS];
4139 memset(bgp_events, 0, sizeof(bgp_events));
4140 #endif /* BGP */
4141
4142 for (c = n, i = 0; i < c; i++)
4143 {
4144 struct event_data *d = events[i].data.ptr;
4145
4146 switch (d->type)
4147 {
4148 case FD_TYPE_CLI: // CLI connections
4149 {
4150 int cli;
4151
4152 alen = sizeof(addr);
4153 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4154 {
4155 cli_do(cli);
4156 close(cli);
4157 }
4158 else
4159 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4160
4161 n--;
4162 break;
4163 }
4164
4165 // these are handled below, with multiple interleaved reads
4166 case FD_TYPE_CLUSTER: cluster_ready++; break;
4167 case FD_TYPE_TUN: tun_ready++; break;
4168 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4169 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4170
4171 case FD_TYPE_PPPOEDISC: // pppoe discovery
4172 s = read(pppoediscfd, p, size_bufp);
4173 if (s > 0) process_pppoe_disc(p, s);
4174 n--;
4175 break;
4176
4177 case FD_TYPE_CONTROL: // nsctl commands
4178 alen = sizeof(addr);
4179 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4180 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4181 n--;
4182 break;
4183
4184 case FD_TYPE_DAE: // DAE requests
4185 alen = sizeof(addr);
4186 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4187 if (s > 0) processdae(p, s, &addr, alen, &local);
4188 n--;
4189 break;
4190
4191 case FD_TYPE_RADIUS: // RADIUS response
4192 alen = sizeof(addr);
4193 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4194 if (s >= 0 && config->cluster_iam_master)
4195 {
4196 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4197 addr.sin_addr.s_addr == config->radiusserver[1])
4198 processrad(p, s, d->index);
4199 else
4200 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4201 fmtaddr(addr.sin_addr.s_addr, 0));
4202 }
4203
4204 n--;
4205 break;
4206
4207 #ifdef BGP
4208 case FD_TYPE_BGP:
4209 bgp_events[d->index] = events[i].events;
4210 n--;
4211 break;
4212 #endif /* BGP */
4213
4214 case FD_TYPE_NETLINK:
4215 {
4216 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4217 s = netlink_recv(p, size_bufp);
4218 if (nh->nlmsg_type == NLMSG_ERROR)
4219 {
4220 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4221 if (errmsg->error)
4222 {
4223 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4224 {
4225 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4226 exit(1);
4227 }
4228 else
4229 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4230 }
4231 // else it's a ack
4232 }
4233 else
4234 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);
4235 n--;
4236 break;
4237 }
4238
4239 default:
4240 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4241 }
4242 }
4243
4244 #ifdef BGP
4245 bgp_process(bgp_events);
4246 #endif /* BGP */
4247
4248 for (c = 0; n && c < config->multi_read_count; c++)
4249 {
4250 for (j = 0; j < config->nbudpfd; j++)
4251 {
4252 // L2TP and L2TP REMOTE LNS
4253 if (udp_ready[j])
4254 {
4255 alen = sizeof(addr);
4256 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4257 {
4258 processudp(p, s, &addr, j);
4259 udp_pkts[j]++;
4260 }
4261 else
4262 {
4263 udp_ready[j] = 0;
4264 n--;
4265 }
4266 }
4267 }
4268
4269 // incoming IP
4270 if (tun_ready)
4271 {
4272 if ((s = read(tunfd, p, size_bufp)) > 0)
4273 {
4274 processtun(p, s);
4275 tun_pkts++;
4276 }
4277 else
4278 {
4279 tun_ready = 0;
4280 n--;
4281 }
4282 }
4283
4284 // pppoe session
4285 if (pppoesess_ready)
4286 {
4287 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4288 {
4289 process_pppoe_sess(p, s);
4290 pppoesess_pkts++;
4291 }
4292 else
4293 {
4294 pppoesess_ready = 0;
4295 n--;
4296 }
4297 }
4298
4299 // cluster
4300 if (cluster_ready)
4301 {
4302 alen = sizeof(addr);
4303 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4304 {
4305 processcluster(p, s, addr.sin_addr.s_addr);
4306 cluster_pkts++;
4307 }
4308 else
4309 {
4310 cluster_ready = 0;
4311 n--;
4312 }
4313 }
4314 }
4315
4316 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4317 STAT(multi_read_used);
4318
4319 if (c >= config->multi_read_count)
4320 {
4321 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4322 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4323 STAT(multi_read_exceeded);
4324 more++;
4325 }
4326 }
4327 #ifdef BGP
4328 else
4329 /* no event received, but timers could still have expired */
4330 bgp_process_peers_timers();
4331 #endif /* BGP */
4332
4333 if (time_changed)
4334 {
4335 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4336
4337 // Log current traffic stats
4338 snprintf(config->bandwidth, sizeof(config->bandwidth),
4339 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4340 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4341 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4342 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4343
4344 udp_tx = udp_rx = 0;
4345 udp_rx_pkt = eth_rx_pkt = 0;
4346 eth_tx = eth_rx = 0;
4347 time_changed = 0;
4348
4349 if (config->dump_speed)
4350 printf("%s\n", config->bandwidth);
4351
4352 // Update the internal time counter
4353 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4354
4355 {
4356 // Run timer hooks
4357 struct param_timer p = { time_now };
4358 run_plugins(PLUGIN_TIMER, &p);
4359 }
4360 }
4361
4362 // Runs on every machine (master and slaves).
4363 if (next_cluster_ping <= TIME)
4364 {
4365 // Check to see which of the cluster is still alive..
4366
4367 cluster_send_ping(basetime); // Only does anything if we're a slave
4368 cluster_check_master(); // ditto.
4369
4370 cluster_heartbeat(); // Only does anything if we're a master.
4371 cluster_check_slaves(); // ditto.
4372
4373 master_update_counts(); // If we're a slave, send our byte counters to our master.
4374
4375 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4376 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4377 else
4378 next_cluster_ping = TIME + config->cluster_hb_interval;
4379 }
4380
4381 if (!config->cluster_iam_master)
4382 continue;
4383
4384 // Run token bucket filtering queue..
4385 // Only run it every 1/10th of a second.
4386 {
4387 static clockt last_run = 0;
4388 if (last_run != TIME)
4389 {
4390 last_run = TIME;
4391 tbf_run_timer();
4392 }
4393 }
4394
4395 // Handle timeouts, retries etc.
4396 {
4397 static double last_clean = 0;
4398 double this_clean;
4399 double diff;
4400
4401 TIME = now(&this_clean);
4402 diff = this_clean - last_clean;
4403
4404 // Run during idle time (after we've handled
4405 // all incoming packets) or every 1/10th sec
4406 if (!more || diff > 0.1)
4407 {
4408 regular_cleanups(diff);
4409 last_clean = this_clean;
4410 }
4411 }
4412
4413 if (*config->accounting_dir)
4414 {
4415 static clockt next_acct = 0;
4416 static clockt next_shut_acct = 0;
4417
4418 if (next_acct <= TIME)
4419 {
4420 // Dump accounting data
4421 next_acct = TIME + ACCT_TIME;
4422 next_shut_acct = TIME + ACCT_SHUT_TIME;
4423 dump_acct_info(1);
4424 }
4425 else if (next_shut_acct <= TIME)
4426 {
4427 // Dump accounting data for shutdown sessions
4428 next_shut_acct = TIME + ACCT_SHUT_TIME;
4429 if (shut_acct_n)
4430 dump_acct_info(0);
4431 }
4432 }
4433 }
4434
4435 // Are we the master and shutting down??
4436 if (config->cluster_iam_master)
4437 cluster_heartbeat(); // Flush any queued changes..
4438
4439 // Ok. Notify everyone we're shutting down. If we're
4440 // the master, this will force an election.
4441 cluster_send_ping(0);
4442
4443 //
4444 // Important!!! We MUST not process any packets past this point!
4445 LOG(1, 0, 0, "Shutdown complete\n");
4446 }
4447
4448 static void stripdomain(char *host)
4449 {
4450 char *p;
4451
4452 if ((p = strchr(host, '.')))
4453 {
4454 char *domain = 0;
4455 char _domain[1024];
4456
4457 // strip off domain
4458 FILE *resolv = fopen("/etc/resolv.conf", "r");
4459 if (resolv)
4460 {
4461 char buf[1024];
4462 char *b;
4463
4464 while (fgets(buf, sizeof(buf), resolv))
4465 {
4466 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4467 continue;
4468
4469 if (!isspace(buf[6]))
4470 continue;
4471
4472 b = buf + 7;
4473 while (isspace(*b)) b++;
4474
4475 if (*b)
4476 {
4477 char *d = b;
4478 while (*b && !isspace(*b)) b++;
4479 *b = 0;
4480 if (buf[0] == 'd') // domain is canonical
4481 {
4482 domain = d;
4483 break;
4484 }
4485
4486 // first search line
4487 if (!domain)
4488 {
4489 // hold, may be subsequent domain line
4490 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4491 domain = _domain;
4492 }
4493 }
4494 }
4495
4496 fclose(resolv);
4497 }
4498
4499 if (domain)
4500 {
4501 int hl = strlen(host);
4502 int dl = strlen(domain);
4503 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4504 host[hl -dl - 1] = 0;
4505 }
4506 else
4507 {
4508 *p = 0; // everything after first dot
4509 }
4510 }
4511 }
4512
4513 // Init data structures
4514 static void initdata(int optdebug, char *optconfig)
4515 {
4516 int i;
4517
4518 if (!(config = shared_malloc(sizeof(configt))))
4519 {
4520 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4521 exit(1);
4522 }
4523
4524 memset(config, 0, sizeof(configt));
4525 time(&config->start_time);
4526 strncpy(config->config_file, optconfig, strlen(optconfig));
4527 config->debug = optdebug;
4528 config->num_tbfs = MAXTBFS;
4529 config->rl_rate = 28; // 28kbps
4530 config->cluster_mcast_ttl = 1;
4531 config->cluster_master_min_adv = 1;
4532 config->ppp_restart_time = 3;
4533 config->ppp_max_configure = 10;
4534 config->ppp_max_failure = 5;
4535 config->kill_timedout_sessions = 1;
4536 strcpy(config->random_device, RANDOMDEVICE);
4537 // Set default value echo_timeout and idle_echo_timeout
4538 config->echo_timeout = ECHO_TIMEOUT;
4539 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4540
4541 log_stream = stderr;
4542
4543 #ifdef RINGBUFFER
4544 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4545 {
4546 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4547 exit(1);
4548 }
4549 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4550 #endif
4551
4552 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4553 {
4554 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4555 exit(1);
4556 }
4557 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4558 {
4559 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4560 exit(1);
4561 }
4562 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4563 {
4564 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4565 exit(1);
4566 }
4567 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4568 {
4569 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4570 exit(1);
4571 }
4572 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4573 {
4574 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4575 exit(1);
4576 }
4577
4578 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4579 {
4580 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4581 exit(1);
4582 }
4583
4584 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4585 {
4586 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4587 exit(1);
4588 }
4589
4590 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4591 {
4592 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4593 exit(1);
4594 }
4595
4596 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4597 {
4598 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4599 exit(1);
4600 }
4601 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4602
4603 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4604 {
4605 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4606 exit(1);
4607 }
4608 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4609
4610 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4611 {
4612 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4613 exit(1);
4614 }
4615 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4616
4617 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4618 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4619 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4620 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4621 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4622
4623 // Put all the sessions on the free list marked as undefined.
4624 for (i = 1; i < MAXSESSION; i++)
4625 {
4626 session[i].next = i + 1;
4627 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4628 }
4629 session[MAXSESSION - 1].next = 0;
4630 sessionfree = 1;
4631
4632 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4633 for (i = 1; i < MAXTUNNEL; i++)
4634 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4635
4636 for (i = 1; i < MAXBUNDLE; i++) {
4637 bundle[i].state = BUNDLEUNDEF;
4638 }
4639
4640 if (!*hostname)
4641 {
4642 // Grab my hostname unless it's been specified
4643 gethostname(hostname, sizeof(hostname));
4644 stripdomain(hostname);
4645 }
4646
4647 _statistics->start_time = _statistics->last_reset = time(NULL);
4648
4649 #ifdef BGP
4650 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4651 {
4652 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4653 exit(1);
4654 }
4655 #endif /* BGP */
4656
4657 lac_initremotelnsdata();
4658 }
4659
4660 static int assign_ip_address(sessionidt s)
4661 {
4662 uint32_t i;
4663 int best = -1;
4664 time_t best_time = time_now;
4665 char *u = session[s].user;
4666 char reuse = 0;
4667
4668
4669 CSTAT(assign_ip_address);
4670
4671 for (i = 1; i < ip_pool_size; i++)
4672 {
4673 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4674 continue;
4675
4676 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4677 {
4678 best = i;
4679 reuse = 1;
4680 break;
4681 }
4682
4683 if (ip_address_pool[i].last < best_time)
4684 {
4685 best = i;
4686 if (!(best_time = ip_address_pool[i].last))
4687 break; // never used, grab this one
4688 }
4689 }
4690
4691 if (best < 0)
4692 {
4693 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4694 return 0;
4695 }
4696
4697 session[s].ip = ip_address_pool[best].address;
4698 session[s].ip_pool_index = best;
4699 ip_address_pool[best].assigned = 1;
4700 ip_address_pool[best].last = time_now;
4701 ip_address_pool[best].session = s;
4702 if (session[s].walled_garden)
4703 /* Don't track addresses of users in walled garden (note: this
4704 means that their address isn't "sticky" even if they get
4705 un-gardened). */
4706 ip_address_pool[best].user[0] = 0;
4707 else
4708 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4709
4710 STAT(ip_allocated);
4711 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4712 reuse ? "Reusing" : "Allocating", best);
4713
4714 return 1;
4715 }
4716
4717 static void free_ip_address(sessionidt s)
4718 {
4719 int i = session[s].ip_pool_index;
4720
4721
4722 CSTAT(free_ip_address);
4723
4724 if (!session[s].ip)
4725 return; // what the?
4726
4727 if (i < 0) // Is this actually part of the ip pool?
4728 i = 0;
4729
4730 STAT(ip_freed);
4731 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4732 session[s].ip = 0;
4733 ip_address_pool[i].assigned = 0;
4734 ip_address_pool[i].session = 0;
4735 ip_address_pool[i].last = time_now;
4736 }
4737
4738 //
4739 // Fsck the address pool against the session table.
4740 // Normally only called when we become a master.
4741 //
4742 // This isn't perfect: We aren't keep tracking of which
4743 // users used to have an IP address.
4744 //
4745 void rebuild_address_pool(void)
4746 {
4747 int i;
4748
4749 //
4750 // Zero the IP pool allocation, and build
4751 // a map from IP address to pool index.
4752 for (i = 1; i < MAXIPPOOL; ++i)
4753 {
4754 ip_address_pool[i].assigned = 0;
4755 ip_address_pool[i].session = 0;
4756 if (!ip_address_pool[i].address)
4757 continue;
4758
4759 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4760 }
4761
4762 for (i = 0; i < MAXSESSION; ++i)
4763 {
4764 int ipid;
4765 if (!(session[i].opened && session[i].ip))
4766 continue;
4767
4768 ipid = - lookup_ipmap(htonl(session[i].ip));
4769
4770 if (session[i].ip_pool_index < 0)
4771 {
4772 // Not allocated out of the pool.
4773 if (ipid < 1) // Not found in the pool either? good.
4774 continue;
4775
4776 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4777 i, fmtaddr(session[i].ip, 0), ipid);
4778
4779 // Fall through and process it as part of the pool.
4780 }
4781
4782
4783 if (ipid > MAXIPPOOL || ipid < 0)
4784 {
4785 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4786 ipid = -1;
4787 session[i].ip_pool_index = ipid;
4788 continue;
4789 }
4790
4791 ip_address_pool[ipid].assigned = 1;
4792 ip_address_pool[ipid].session = i;
4793 ip_address_pool[ipid].last = time_now;
4794 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4795 session[i].ip_pool_index = ipid;
4796 cache_ipmap(session[i].ip, i); // Fix the ip map.
4797 }
4798 }
4799
4800 //
4801 // Fix the address pool to match a changed session.
4802 // (usually when the master sends us an update).
4803 static void fix_address_pool(int sid)
4804 {
4805 int ipid;
4806
4807 ipid = session[sid].ip_pool_index;
4808
4809 if (ipid > ip_pool_size)
4810 return; // Ignore it. rebuild_address_pool will fix it up.
4811
4812 if (ip_address_pool[ipid].address != session[sid].ip)
4813 return; // Just ignore it. rebuild_address_pool will take care of it.
4814
4815 ip_address_pool[ipid].assigned = 1;
4816 ip_address_pool[ipid].session = sid;
4817 ip_address_pool[ipid].last = time_now;
4818 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4819 }
4820
4821 //
4822 // Add a block of addresses to the IP pool to hand out.
4823 //
4824 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4825 {
4826 int i;
4827 if (prefixlen == 0)
4828 prefixlen = 32; // Host route only.
4829
4830 addr &= 0xffffffff << (32 - prefixlen);
4831
4832 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4833 return ;
4834
4835 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4836 {
4837 if ((i & 0xff) == 0 || (i&0xff) == 255)
4838 continue; // Skip 0 and broadcast addresses.
4839
4840 ip_address_pool[ip_pool_size].address = i;
4841 ip_address_pool[ip_pool_size].assigned = 0;
4842 ++ip_pool_size;
4843 if (ip_pool_size >= MAXIPPOOL)
4844 {
4845 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4846 return;
4847 }
4848 }
4849 }
4850
4851 // Initialize the IP address pool
4852 static void initippool()
4853 {
4854 FILE *f;
4855 char *p;
4856 char buf[4096];
4857 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4858
4859 if (!(f = fopen(IPPOOLFILE, "r")))
4860 {
4861 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4862 exit(1);
4863 }
4864
4865 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4866 {
4867 char *pool = buf;
4868 buf[4095] = 0; // Force it to be zero terminated/
4869
4870 if (*buf == '#' || *buf == '\n')
4871 continue; // Skip comments / blank lines
4872 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4873 if ((p = (char *)strchr(buf, ':')))
4874 {
4875 in_addr_t src;
4876 *p = '\0';
4877 src = inet_addr(buf);
4878 if (src == INADDR_NONE)
4879 {
4880 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4881 exit(1);
4882 }
4883 // This entry is for a specific IP only
4884 if (src != config->bind_address)
4885 continue;
4886 *p = ':';
4887 pool = p+1;
4888 }
4889 if ((p = (char *)strchr(pool, '/')))
4890 {
4891 // It's a range
4892 int numbits = 0;
4893 in_addr_t start = 0;
4894
4895 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4896 *p++ = 0;
4897 if (!*p || !(numbits = atoi(p)))
4898 {
4899 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4900 continue;
4901 }
4902 start = ntohl(inet_addr(pool));
4903
4904 // Add a static route for this pool
4905 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4906 fmtaddr(htonl(start), 0), numbits);
4907
4908 routeset(0, start, numbits, 0, 1);
4909
4910 add_to_ip_pool(start, numbits);
4911 }
4912 else
4913 {
4914 // It's a single ip address
4915 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4916 }
4917 }
4918 fclose(f);
4919 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4920 }
4921
4922 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4923 {
4924 struct sockaddr_in snoop_addr = {0};
4925 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4926 return;
4927
4928 snoop_addr.sin_family = AF_INET;
4929 snoop_addr.sin_addr.s_addr = destination;
4930 snoop_addr.sin_port = ntohs(port);
4931
4932 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4933 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4934 htons(snoop_addr.sin_port));
4935
4936 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4937 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4938
4939 STAT(packets_snooped);
4940 }
4941
4942 static int dump_session(FILE **f, sessiont *s)
4943 {
4944 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4945 return 1;
4946
4947 if (!*f)
4948 {
4949 char filename[1024];
4950 char timestr[64];
4951 time_t now = time(NULL);
4952
4953 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4954 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4955
4956 if (!(*f = fopen(filename, "w")))
4957 {
4958 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4959 return 0;
4960 }
4961
4962 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4963 if(config->account_all_origin)
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 origin(L=LAC, R=Remote LNS, P=PPPOE)\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 else
4977 {
4978 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4979 "# host: %s\n"
4980 "# endpoint: %s\n"
4981 "# time: %ld\n"
4982 "# uptime: %ld\n"
4983 "# format: username ip qos uptxoctets downrxoctets\n",
4984 hostname,
4985 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4986 now,
4987 now - basetime);
4988 }
4989 }
4990
4991 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4992 if(config->account_all_origin)
4993 {
4994 fprintf(*f, "%s %s %d %u %u %s\n",
4995 s->user, // username
4996 fmtaddr(htonl(s->ip), 0), // ip
4997 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4998 (uint32_t) s->cin_delta, // uptxoctets
4999 (uint32_t) s->cout_delta, // downrxoctets
5000 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
5001 }
5002 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
5003 {
5004 fprintf(*f, "%s %s %d %u %u\n",
5005 s->user, // username
5006 fmtaddr(htonl(s->ip), 0), // ip
5007 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5008 (uint32_t) s->cin_delta, // uptxoctets
5009 (uint32_t) s->cout_delta); // downrxoctets
5010 }
5011
5012 s->cin_delta = s->cout_delta = 0;
5013
5014 return 1;
5015 }
5016
5017 static void dump_acct_info(int all)
5018 {
5019 int i;
5020 FILE *f = NULL;
5021
5022
5023 CSTAT(dump_acct_info);
5024
5025 if (shut_acct_n)
5026 {
5027 for (i = 0; i < shut_acct_n; i++)
5028 dump_session(&f, &shut_acct[i]);
5029
5030 shut_acct_n = 0;
5031 }
5032
5033 if (all)
5034 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5035 dump_session(&f, &session[i]);
5036
5037 if (f)
5038 fclose(f);
5039 }
5040
5041 // Main program
5042 int main(int argc, char *argv[])
5043 {
5044 int i;
5045 int optdebug = 0;
5046 char *optconfig = CONFIGFILE;
5047
5048 time(&basetime); // start clock
5049
5050 // scan args
5051 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5052 {
5053 switch (i)
5054 {
5055 case 'd':
5056 if (fork()) exit(0);
5057 setsid();
5058 if(!freopen("/dev/null", "r", stdin)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno));
5059 if(!freopen("/dev/null", "w", stdout)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno));
5060 if(!freopen("/dev/null", "w", stderr)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno));
5061 break;
5062 case 'v':
5063 optdebug++;
5064 break;
5065 case 'c':
5066 optconfig = optarg;
5067 break;
5068 case 'h':
5069 snprintf(hostname, sizeof(hostname), "%s", optarg);
5070 break;
5071 default:
5072 printf("Args are:\n"
5073 "\t-d\t\tDetach from terminal\n"
5074 "\t-c <file>\tConfig file\n"
5075 "\t-h <hostname>\tForce hostname\n"
5076 "\t-v\t\tDebug\n");
5077
5078 return (0);
5079 break;
5080 }
5081 }
5082
5083 // Start the timer routine off
5084 time(&time_now);
5085 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5086
5087 initplugins();
5088 initdata(optdebug, optconfig);
5089
5090 init_cli();
5091 read_config_file();
5092 /* set hostname /after/ having read the config file */
5093 if (*config->hostname)
5094 strcpy(hostname, config->hostname);
5095 cli_init_complete(hostname);
5096 update_config();
5097 init_tbf(config->num_tbfs);
5098
5099 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5100 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5101 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5102 {
5103 struct rlimit rlim;
5104 rlim.rlim_cur = RLIM_INFINITY;
5105 rlim.rlim_max = RLIM_INFINITY;
5106 // Remove the maximum core size
5107 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5108 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5109
5110 // Make core dumps go to /tmp
5111 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno));
5112 }
5113
5114 if (config->scheduler_fifo)
5115 {
5116 int ret;
5117 struct sched_param params = {0};
5118 params.sched_priority = 1;
5119
5120 if (get_nprocs() < 2)
5121 {
5122 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5123 config->scheduler_fifo = 0;
5124 }
5125 else
5126 {
5127 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5128 {
5129 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5130 }
5131 else
5132 {
5133 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5134 config->scheduler_fifo = 0;
5135 }
5136 }
5137 }
5138
5139 initnetlink();
5140
5141 /* Set up the cluster communications port. */
5142 if (cluster_init() < 0)
5143 exit(1);
5144
5145 inittun();
5146 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5147
5148 if (*config->pppoe_if_to_bind)
5149 {
5150 init_pppoe();
5151 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5152 }
5153
5154 if (!config->nbmultiaddress)
5155 {
5156 config->bind_n_address[0] = config->bind_address;
5157 config->nbmultiaddress++;
5158 }
5159 config->nbudpfd = config->nbmultiaddress;
5160 for (i = 0; i < config->nbudpfd; i++)
5161 initudp(&udpfd[i], config->bind_n_address[i]);
5162 initlacudp();
5163 config->indexlacudpfd = config->nbudpfd;
5164 udpfd[config->indexlacudpfd] = udplacfd;
5165 config->nbudpfd++;
5166
5167 initcontrol();
5168 initdae();
5169
5170 // Intercept
5171 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5172
5173 initrad();
5174 initippool();
5175
5176 // seed prng
5177 {
5178 unsigned seed = time_now ^ getpid();
5179 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5180 srand(seed);
5181 }
5182
5183 signal(SIGHUP, sighup_handler);
5184 signal(SIGCHLD, sigchild_handler);
5185 signal(SIGTERM, shutdown_handler);
5186 signal(SIGINT, shutdown_handler);
5187 signal(SIGQUIT, shutdown_handler);
5188
5189 // Prevent us from getting paged out
5190 if (config->lock_pages)
5191 {
5192 if (!mlockall(MCL_CURRENT))
5193 LOG(1, 0, 0, "Locking pages into memory\n");
5194 else
5195 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5196 }
5197
5198 mainloop();
5199
5200 /* remove plugins (so cleanup code gets run) */
5201 plugins_done();
5202
5203 // Remove the PID file if we wrote it
5204 if (config->wrote_pid && *config->pid_file == '/')
5205 unlink(config->pid_file);
5206
5207 /* kill CLI children */
5208 signal(SIGTERM, SIG_IGN);
5209 kill(0, SIGTERM);
5210 return 0;
5211 }
5212
5213 static void sighup_handler(int sig)
5214 {
5215 main_reload++;
5216 }
5217
5218 static void shutdown_handler(int sig)
5219 {
5220 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5221 }
5222
5223 static void sigchild_handler(int sig)
5224 {
5225 while (waitpid(-1, NULL, WNOHANG) > 0)
5226 ;
5227 }
5228
5229 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5230 {
5231 MD5_CTX ctx;
5232 *challenge_response = NULL;
5233
5234 if (!*config->l2tp_secret)
5235 {
5236 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5237 return;
5238 }
5239
5240 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5241
5242 *challenge_response = calloc(17, 1);
5243
5244 MD5_Init(&ctx);
5245 MD5_Update(&ctx, &id, 1);
5246 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5247 MD5_Update(&ctx, challenge, challenge_length);
5248 MD5_Final(*challenge_response, &ctx);
5249
5250 return;
5251 }
5252
5253 static int facility_value(char *name)
5254 {
5255 int i;
5256 for (i = 0; facilitynames[i].c_name; i++)
5257 {
5258 if (strcmp(facilitynames[i].c_name, name) == 0)
5259 return facilitynames[i].c_val;
5260 }
5261 return 0;
5262 }
5263
5264 static void update_config()
5265 {
5266 int i;
5267 char *p;
5268 static int timeout = 0;
5269 static int interval = 0;
5270
5271 // Update logging
5272 closelog();
5273 syslog_log = 0;
5274 if (log_stream)
5275 {
5276 if (log_stream != stderr)
5277 fclose(log_stream);
5278
5279 log_stream = NULL;
5280 }
5281
5282 if (*config->log_filename)
5283 {
5284 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5285 {
5286 char *p = config->log_filename + 7;
5287 if (*p)
5288 {
5289 openlog("l2tpns", LOG_PID, facility_value(p));
5290 syslog_log = 1;
5291 }
5292 }
5293 else if (strchr(config->log_filename, '/') == config->log_filename)
5294 {
5295 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5296 {
5297 fseek(log_stream, 0, SEEK_END);
5298 setbuf(log_stream, NULL);
5299 }
5300 else
5301 {
5302 log_stream = stderr;
5303 setbuf(log_stream, NULL);
5304 }
5305 }
5306 }
5307 else
5308 {
5309 log_stream = stderr;
5310 setbuf(log_stream, NULL);
5311 }
5312
5313 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5314 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5315
5316 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5317 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5318 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5319
5320 // reset MRU/MSS globals
5321 MRU = config->l2tp_mtu - L2TP_HDRS;
5322 if (MRU > PPPoE_MRU)
5323 MRU = PPPoE_MRU;
5324
5325 MSS = MRU - TCP_HDRS;
5326
5327 // Update radius
5328 config->numradiusservers = 0;
5329 for (i = 0; i < MAXRADSERVER; i++)
5330 if (config->radiusserver[i])
5331 {
5332 config->numradiusservers++;
5333 // Set radius port: if not set, take the port from the
5334 // first radius server. For the first radius server,
5335 // take the #defined default value from l2tpns.h
5336
5337 // test twice, In case someone works with
5338 // a secondary radius server without defining
5339 // a primary one, this will work even then.
5340 if (i > 0 && !config->radiusport[i])
5341 config->radiusport[i] = config->radiusport[i-1];
5342 if (!config->radiusport[i])
5343 config->radiusport[i] = RADPORT;
5344 }
5345
5346 if (!config->numradiusservers)
5347 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5348
5349 // parse radius_authtypes_s
5350 config->radius_authtypes = config->radius_authprefer = 0;
5351 p = config->radius_authtypes_s;
5352 while (p && *p)
5353 {
5354 char *s = strpbrk(p, " \t,");
5355 int type = 0;
5356
5357 if (s)
5358 {
5359 *s++ = 0;
5360 while (*s == ' ' || *s == '\t')
5361 s++;
5362
5363 if (!*s)
5364 s = 0;
5365 }
5366
5367 if (!strncasecmp("chap", p, strlen(p)))
5368 type = AUTHCHAP;
5369 else if (!strncasecmp("pap", p, strlen(p)))
5370 type = AUTHPAP;
5371 else
5372 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5373
5374 config->radius_authtypes |= type;
5375 if (!config->radius_authprefer)
5376 config->radius_authprefer = type;
5377
5378 p = s;
5379 }
5380
5381 if (!config->radius_authtypes)
5382 {
5383 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5384 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5385 }
5386
5387 // normalise radius_authtypes_s
5388 if (config->radius_authprefer == AUTHPAP)
5389 {
5390 strcpy(config->radius_authtypes_s, "pap");
5391 if (config->radius_authtypes & AUTHCHAP)
5392 strcat(config->radius_authtypes_s, ", chap");
5393 }
5394 else
5395 {
5396 strcpy(config->radius_authtypes_s, "chap");
5397 if (config->radius_authtypes & AUTHPAP)
5398 strcat(config->radius_authtypes_s, ", pap");
5399 }
5400
5401 if (!config->radius_dae_port)
5402 config->radius_dae_port = DAEPORT;
5403
5404 if(!config->bind_portremotelns)
5405 config->bind_portremotelns = L2TPLACPORT;
5406 if(!config->bind_address_remotelns)
5407 config->bind_address_remotelns = INADDR_ANY;
5408
5409 if (*config->bind_multi_address)
5410 {
5411 char *sip = config->bind_multi_address;
5412 char *n = sip;
5413 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5414 config->nbmultiaddress = 0;
5415
5416 while (*sip && (sip < e))
5417 {
5418 in_addr_t ip = 0;
5419 uint8_t u = 0;
5420
5421 while (n < e && (*n == ',' || *n == ' ')) n++;
5422
5423 while (n < e && (isdigit(*n) || *n == '.'))
5424 {
5425 if (*n == '.')
5426 {
5427 ip = (ip << 8) + u;
5428 u = 0;
5429 }
5430 else
5431 u = u * 10 + *n - '0';
5432 n++;
5433 }
5434 ip = (ip << 8) + u;
5435 n++;
5436
5437 if (ip)
5438 {
5439 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5440 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5441 config->nbmultiaddress++;
5442 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5443
5444 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5445 }
5446
5447 sip = n;
5448 }
5449
5450 if (config->nbmultiaddress >= 1)
5451 {
5452 config->bind_address = config->bind_n_address[0];
5453 config->iftun_address = config->bind_address;
5454 }
5455 }
5456
5457 if(!config->iftun_address)
5458 {
5459 config->iftun_address = config->bind_address;
5460 config->iftun_n_address[0] = config->iftun_address;
5461 }
5462
5463 if (*config->multi_hostname)
5464 {
5465 char *shost = config->multi_hostname;
5466 char *n = shost;
5467 char *e = config->multi_hostname + strlen(config->multi_hostname);
5468 config->nbmultihostname = 0;
5469
5470 while (*shost && (shost < e))
5471 {
5472 while ((n < e) && (*n == ' ' || *n == ',' || *n == '\t')) n++;
5473
5474 i = 0;
5475 while (n < e && (*n != ',') && (*n != '\t'))
5476 {
5477 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5478 n++;i++;
5479 }
5480
5481 if (i > 0)
5482 {
5483 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5484 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5485 config->nbmultihostname++;
5486 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5487 }
5488
5489 shost = n;
5490 }
5491
5492 if (config->nbmultihostname >= 1)
5493 {
5494 strcpy(hostname, config->multi_n_hostname[0]);
5495 strcpy(config->hostname, hostname);
5496 }
5497 }
5498
5499 if (!*config->pppoe_ac_name)
5500 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5501
5502 // re-initialise the random number source
5503 initrandom(config->random_device);
5504
5505 // Update plugins
5506 for (i = 0; i < MAXPLUGINS; i++)
5507 {
5508 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5509 continue;
5510
5511 if (*config->plugins[i])
5512 {
5513 // Plugin added
5514 add_plugin(config->plugins[i]);
5515 }
5516 else if (*config->old_plugins[i])
5517 {
5518 // Plugin removed
5519 remove_plugin(config->old_plugins[i]);
5520 }
5521 }
5522
5523 // Guest change
5524 guest_accounts_num = 0;
5525 char *p2 = config->guest_user;
5526 while (p2 && *p2)
5527 {
5528 char *s = strpbrk(p2, " \t,");
5529 if (s)
5530 {
5531 *s++ = 0;
5532 while (*s == ' ' || *s == '\t')
5533 s++;
5534
5535 if (!*s)
5536 s = 0;
5537 }
5538
5539 strcpy(guest_users[guest_accounts_num], p2);
5540 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5541 guest_accounts_num++;
5542 p2 = s;
5543 }
5544 // Rebuild the guest_user array
5545 strcpy(config->guest_user, "");
5546 int ui = 0;
5547 for (ui=0; ui<guest_accounts_num; ui++)
5548 {
5549 strcat(config->guest_user, guest_users[ui]);
5550 if (ui<guest_accounts_num-1)
5551 {
5552 strcat(config->guest_user, ",");
5553 }
5554 }
5555
5556
5557 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5558 if (!config->multi_read_count) config->multi_read_count = 10;
5559 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5560 if (!*config->cluster_interface)
5561 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5562
5563 if (!config->cluster_hb_interval)
5564 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5565
5566 if (!config->cluster_hb_timeout)
5567 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5568
5569 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5570 {
5571 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5572 // late, ensure we're sufficiently larger than that
5573 int t = 4 * config->cluster_hb_interval + 11;
5574
5575 if (config->cluster_hb_timeout < t)
5576 {
5577 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5578 config->cluster_hb_timeout = t;
5579 }
5580
5581 // Push timing changes to the slaves immediately if we're the master
5582 if (config->cluster_iam_master)
5583 cluster_heartbeat();
5584
5585 interval = config->cluster_hb_interval;
5586 timeout = config->cluster_hb_timeout;
5587 }
5588
5589 // Write PID file
5590 if (*config->pid_file == '/' && !config->wrote_pid)
5591 {
5592 FILE *f;
5593 if ((f = fopen(config->pid_file, "w")))
5594 {
5595 fprintf(f, "%d\n", getpid());
5596 fclose(f);
5597 config->wrote_pid = 1;
5598 }
5599 else
5600 {
5601 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5602 }
5603 }
5604 }
5605
5606 static void read_config_file()
5607 {
5608 FILE *f;
5609
5610 if (!config->config_file) return;
5611 if (!(f = fopen(config->config_file, "r")))
5612 {
5613 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5614 return;
5615 }
5616
5617 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5618 cli_do_file(f);
5619 LOG(3, 0, 0, "Done reading config file\n");
5620 fclose(f);
5621 }
5622
5623 int sessionsetup(sessionidt s, tunnelidt t)
5624 {
5625 // A session now exists, set it up
5626 in_addr_t ip;
5627 char *user;
5628 sessionidt i;
5629 int r;
5630
5631 CSTAT(sessionsetup);
5632
5633 LOG(3, s, t, "Doing session setup for session\n");
5634
5635 // Join a bundle if the MRRU option is accepted
5636 if(session[s].mrru > 0 && session[s].bundle == 0)
5637 {
5638 LOG(3, s, t, "This session can be part of multilink bundle\n");
5639 if (join_bundle(s) > 0)
5640 cluster_send_bundle(session[s].bundle);
5641 else
5642 {
5643 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5644 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5645 return 0;
5646 }
5647 }
5648
5649 if (!session[s].ip)
5650 {
5651 assign_ip_address(s);
5652 if (!session[s].ip)
5653 {
5654 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5655 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5656 return 0;
5657 }
5658 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5659 fmtaddr(htonl(session[s].ip), 0));
5660 }
5661
5662 // Make sure this is right
5663 session[s].tunnel = t;
5664
5665 // zap old sessions with same IP and/or username
5666 // Don't kill gardened sessions - doing so leads to a DoS
5667 // from someone who doesn't need to know the password
5668 {
5669 ip = session[s].ip;
5670 user = session[s].user;
5671 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5672 {
5673 if (i == s) continue;
5674 if (!session[s].opened) break;
5675 // Allow duplicate sessions for multilink ones of the same bundle.
5676 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5677
5678 if (ip == session[i].ip)
5679 {
5680 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5681 continue;
5682 }
5683
5684 if (config->allow_duplicate_users) continue;
5685 if (session[s].walled_garden || session[i].walled_garden) continue;
5686 // Guest change
5687 int found = 0;
5688 int gu;
5689 for (gu = 0; gu < guest_accounts_num; gu++)
5690 {
5691 if (!strcasecmp(user, guest_users[gu]))
5692 {
5693 found = 1;
5694 break;
5695 }
5696 }
5697 if (found) continue;
5698
5699 // Drop the new session in case of duplicate sessionss, not the old one.
5700 if (!strcasecmp(user, session[i].user))
5701 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5702 }
5703 }
5704
5705 // no need to set a route for the same IP address of the bundle
5706 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5707 {
5708 int routed = 0;
5709
5710 // Add the route for this session.
5711 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5712 {
5713 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5714 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5715 routed++;
5716
5717 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5718 }
5719
5720 // Static IPs need to be routed if not already
5721 // convered by a Framed-Route. Anything else is part
5722 // of the IP address pool and is already routed, it
5723 // just needs to be added to the IP cache.
5724 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5725 if (session[s].ip_pool_index == -1) // static ip
5726 {
5727 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5728 }
5729 else
5730 cache_ipmap(session[s].ip, s);
5731 }
5732
5733 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5734 lcp_open(s, t); // transition to Network phase and send initial IPCP
5735
5736 // Run the plugin's against this new session.
5737 {
5738 struct param_new_session data = { &tunnel[t], &session[s] };
5739 run_plugins(PLUGIN_NEW_SESSION, &data);
5740 }
5741
5742 // Allocate TBFs if throttled
5743 if (session[s].throttle_in || session[s].throttle_out)
5744 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5745
5746 session[s].last_packet = session[s].last_data = time_now;
5747
5748 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5749 fmtaddr(htonl(session[s].ip), 0),
5750 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5751
5752 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5753
5754 return 1; // RADIUS OK and IP allocated, done...
5755 }
5756
5757 //
5758 // This session just got dropped on us by the master or something.
5759 // Make sure our tables up up to date...
5760 //
5761 int load_session(sessionidt s, sessiont *new)
5762 {
5763 int i;
5764 int newip = 0;
5765
5766 // Sanity checks.
5767 if (new->ip_pool_index >= MAXIPPOOL ||
5768 new->tunnel >= MAXTUNNEL)
5769 {
5770 LOG(0, s, 0, "Strange session update received!\n");
5771 // FIXME! What to do here?
5772 return 0;
5773 }
5774
5775 //
5776 // Ok. All sanity checks passed. Now we're committed to
5777 // loading the new session.
5778 //
5779
5780 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5781
5782 // See if routes/ip cache need updating
5783 if (new->ip != session[s].ip)
5784 newip++;
5785
5786 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5787 if (new->route[i].ip != session[s].route[i].ip ||
5788 new->route[i].prefixlen != session[s].route[i].prefixlen)
5789 newip++;
5790
5791 // needs update
5792 if (newip)
5793 {
5794 int routed = 0;
5795
5796 // remove old routes...
5797 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5798 {
5799 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5800 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5801 routed++;
5802
5803 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5804 }
5805
5806 // ...ip
5807 if (session[s].ip)
5808 {
5809 if (session[s].ip_pool_index == -1) // static IP
5810 {
5811 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5812 }
5813 else // It's part of the IP pool, remove it manually.
5814 uncache_ipmap(session[s].ip);
5815 }
5816
5817 // remove old IPV6 routes...
5818 if (session[s].ipv6route.s6_addr[0] && session[s].ipv6prefixlen)
5819 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
5820
5821 routed = 0;
5822
5823 // add new routes...
5824 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5825 {
5826 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5827 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5828 routed++;
5829
5830 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5831 }
5832
5833 // ...ip
5834 if (new->ip)
5835 {
5836 // If there's a new one, add it.
5837 if (new->ip_pool_index == -1)
5838 {
5839 if (!routed) routeset(s, new->ip, 0, 0, 1);
5840 }
5841 else
5842 cache_ipmap(new->ip, s);
5843 }
5844 }
5845
5846 // check v6 routing
5847 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5848 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5849
5850 // check filters
5851 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5852 {
5853 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5854 new->filter_in = 0;
5855 }
5856
5857 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5858 {
5859 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5860 new->filter_out = 0;
5861 }
5862
5863 if (new->filter_in != session[s].filter_in)
5864 {
5865 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5866 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5867 }
5868
5869 if (new->filter_out != session[s].filter_out)
5870 {
5871 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5872 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5873 }
5874
5875 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5876 // for walking the sessions to forward byte counts to the master.
5877 config->cluster_highest_sessionid = s;
5878
5879 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5880
5881 // Do fixups into address pool.
5882 if (new->ip_pool_index != -1)
5883 fix_address_pool(s);
5884
5885 return 1;
5886 }
5887
5888 static void initplugins()
5889 {
5890 int i;
5891
5892 loaded_plugins = ll_init();
5893 // Initialize the plugins to nothing
5894 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5895 plugins[i] = ll_init();
5896 }
5897
5898 static void *open_plugin(char *plugin_name, int load)
5899 {
5900 char path[256] = "";
5901
5902 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5903 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5904 return dlopen(path, RTLD_NOW);
5905 }
5906
5907 // plugin callback to get a config value
5908 static void *getconfig(char *key, enum config_typet type)
5909 {
5910 int i;
5911
5912 for (i = 0; config_values[i].key; i++)
5913 {
5914 if (!strcmp(config_values[i].key, key))
5915 {
5916 if (config_values[i].type == type)
5917 return ((void *) config) + config_values[i].offset;
5918
5919 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5920 key, type, config_values[i].type);
5921
5922 return 0;
5923 }
5924 }
5925
5926 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5927 return 0;
5928 }
5929
5930 static int add_plugin(char *plugin_name)
5931 {
5932 static struct pluginfuncs funcs = {
5933 _log,
5934 _log_hex,
5935 fmtaddr,
5936 sessionbyuser,
5937 sessiontbysessionidt,
5938 sessionidtbysessiont,
5939 radiusnew,
5940 radiussend,
5941 getconfig,
5942 sessionshutdown,
5943 sessionkill,
5944 throttle_session,
5945 cluster_send_session,
5946 };
5947
5948 void *p = open_plugin(plugin_name, 1);
5949 int (*initfunc)(struct pluginfuncs *);
5950 int i;
5951
5952 if (!p)
5953 {
5954 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5955 return -1;
5956 }
5957
5958 if (ll_contains(loaded_plugins, p))
5959 {
5960 dlclose(p);
5961 return 0; // already loaded
5962 }
5963
5964 {
5965 int *v = dlsym(p, "plugin_api_version");
5966 if (!v || *v != PLUGIN_API_VERSION)
5967 {
5968 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5969 dlclose(p);
5970 return -1;
5971 }
5972 }
5973
5974 if ((initfunc = dlsym(p, "plugin_init")))
5975 {
5976 if (!initfunc(&funcs))
5977 {
5978 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5979 dlclose(p);
5980 return -1;
5981 }
5982 }
5983
5984 ll_push(loaded_plugins, p);
5985
5986 for (i = 0; i < max_plugin_functions; i++)
5987 {
5988 void *x;
5989 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5990 {
5991 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5992 ll_push(plugins[i], x);
5993 }
5994 }
5995
5996 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5997 return 1;
5998 }
5999
6000 static void run_plugin_done(void *plugin)
6001 {
6002 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
6003
6004 if (donefunc)
6005 donefunc();
6006 }
6007
6008 static int remove_plugin(char *plugin_name)
6009 {
6010 void *p = open_plugin(plugin_name, 0);
6011 int loaded = 0;
6012
6013 if (!p)
6014 return -1;
6015
6016 if (ll_contains(loaded_plugins, p))
6017 {
6018 int i;
6019 for (i = 0; i < max_plugin_functions; i++)
6020 {
6021 void *x;
6022 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6023 ll_delete(plugins[i], x);
6024 }
6025
6026 ll_delete(loaded_plugins, p);
6027 run_plugin_done(p);
6028 loaded = 1;
6029 }
6030
6031 dlclose(p);
6032 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6033 return loaded;
6034 }
6035
6036 int run_plugins(int plugin_type, void *data)
6037 {
6038 int (*func)(void *data);
6039
6040 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6041 return PLUGIN_RET_ERROR;
6042
6043 ll_reset(plugins[plugin_type]);
6044 while ((func = ll_next(plugins[plugin_type])))
6045 {
6046 int r = func(data);
6047
6048 if (r != PLUGIN_RET_OK)
6049 return r; // stop here
6050 }
6051
6052 return PLUGIN_RET_OK;
6053 }
6054
6055 static void plugins_done()
6056 {
6057 void *p;
6058
6059 ll_reset(loaded_plugins);
6060 while ((p = ll_next(loaded_plugins)))
6061 run_plugin_done(p);
6062 }
6063
6064 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6065 {
6066 struct nsctl request;
6067 struct nsctl response;
6068 int type = unpack_control(&request, buf, len);
6069 int r;
6070 void *p;
6071
6072 if (log_stream && config->debug >= 4)
6073 {
6074 if (type < 0)
6075 {
6076 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6077 fmtaddr(addr->sin_addr.s_addr, 0), type);
6078 }
6079 else
6080 {
6081 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6082 dump_control(&request, log_stream);
6083 }
6084 }
6085
6086 switch (type)
6087 {
6088 case NSCTL_REQ_LOAD:
6089 if (request.argc != 1)
6090 {
6091 response.type = NSCTL_RES_ERR;
6092 response.argc = 1;
6093 response.argv[0] = "name of plugin required";
6094 }
6095 else if ((r = add_plugin(request.argv[0])) < 1)
6096 {
6097 response.type = NSCTL_RES_ERR;
6098 response.argc = 1;
6099 response.argv[0] = !r
6100 ? "plugin already loaded"
6101 : "error loading plugin";
6102 }
6103 else
6104 {
6105 response.type = NSCTL_RES_OK;
6106 response.argc = 0;
6107 }
6108
6109 break;
6110
6111 case NSCTL_REQ_UNLOAD:
6112 if (request.argc != 1)
6113 {
6114 response.type = NSCTL_RES_ERR;
6115 response.argc = 1;
6116 response.argv[0] = "name of plugin required";
6117 }
6118 else if ((r = remove_plugin(request.argv[0])) < 1)
6119 {
6120 response.type = NSCTL_RES_ERR;
6121 response.argc = 1;
6122 response.argv[0] = !r
6123 ? "plugin not loaded"
6124 : "plugin not found";
6125 }
6126 else
6127 {
6128 response.type = NSCTL_RES_OK;
6129 response.argc = 0;
6130 }
6131
6132 break;
6133
6134 case NSCTL_REQ_HELP:
6135 response.type = NSCTL_RES_OK;
6136 response.argc = 0;
6137
6138 ll_reset(loaded_plugins);
6139 while ((p = ll_next(loaded_plugins)))
6140 {
6141 char **help = dlsym(p, "plugin_control_help");
6142 while (response.argc < 0xff && help && *help)
6143 response.argv[response.argc++] = *help++;
6144 }
6145
6146 break;
6147
6148 case NSCTL_REQ_CONTROL:
6149 {
6150 struct param_control param = {
6151 config->cluster_iam_master,
6152 request.argc,
6153 request.argv,
6154 0,
6155 NULL,
6156 };
6157
6158 int r = run_plugins(PLUGIN_CONTROL, &param);
6159
6160 if (r == PLUGIN_RET_ERROR)
6161 {
6162 response.type = NSCTL_RES_ERR;
6163 response.argc = 1;
6164 response.argv[0] = param.additional
6165 ? param.additional
6166 : "error returned by plugin";
6167 }
6168 else if (r == PLUGIN_RET_NOTMASTER)
6169 {
6170 static char msg[] = "must be run on master: 000.000.000.000";
6171
6172 response.type = NSCTL_RES_ERR;
6173 response.argc = 1;
6174 if (config->cluster_master_address)
6175 {
6176 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6177 response.argv[0] = msg;
6178 }
6179 else
6180 {
6181 response.argv[0] = "must be run on master: none elected";
6182 }
6183 }
6184 else if (!(param.response & NSCTL_RESPONSE))
6185 {
6186 response.type = NSCTL_RES_ERR;
6187 response.argc = 1;
6188 response.argv[0] = param.response
6189 ? "unrecognised response value from plugin"
6190 : "unhandled action";
6191 }
6192 else
6193 {
6194 response.type = param.response;
6195 response.argc = 0;
6196 if (param.additional)
6197 {
6198 response.argc = 1;
6199 response.argv[0] = param.additional;
6200 }
6201 }
6202 }
6203
6204 break;
6205
6206 default:
6207 response.type = NSCTL_RES_ERR;
6208 response.argc = 1;
6209 response.argv[0] = "error unpacking control packet";
6210 }
6211
6212 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6213 if (!buf)
6214 {
6215 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6216 return;
6217 }
6218
6219 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6220 if (r > 0)
6221 {
6222 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6223 if (log_stream && config->debug >= 4)
6224 {
6225 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6226 dump_control(&response, log_stream);
6227 }
6228 }
6229 else
6230 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6231 fmtaddr(addr->sin_addr.s_addr, 0), r);
6232
6233 free(buf);
6234 }
6235
6236 static tunnelidt new_tunnel()
6237 {
6238 tunnelidt i;
6239 for (i = 1; i < MAXTUNNEL; i++)
6240 {
6241 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6242 {
6243 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6244 if (i > config->cluster_highest_tunnelid)
6245 config->cluster_highest_tunnelid = i;
6246 return i;
6247 }
6248 }
6249 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6250 return 0;
6251 }
6252
6253 //
6254 // We're becoming the master. Do any required setup..
6255 //
6256 // This is principally telling all the plugins that we're
6257 // now a master, and telling them about all the sessions
6258 // that are active too..
6259 //
6260 void become_master(void)
6261 {
6262 int s, i;
6263 static struct event_data d[RADIUS_FDS];
6264 struct epoll_event e;
6265
6266 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6267
6268 // running a bunch of iptables commands is slow and can cause
6269 // the master to drop tunnels on takeover--kludge around the
6270 // problem by forking for the moment (note: race)
6271 if (!fork_and_close())
6272 {
6273 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6274 {
6275 if (!session[s].opened) // Not an in-use session.
6276 continue;
6277
6278 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6279 }
6280 exit(0);
6281 }
6282
6283 // add radius fds
6284 e.events = EPOLLIN;
6285 for (i = 0; i < RADIUS_FDS; i++)
6286 {
6287 d[i].type = FD_TYPE_RADIUS;
6288 d[i].index = i;
6289 e.data.ptr = &d[i];
6290
6291 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6292 }
6293 }
6294
6295 int cmd_show_hist_idle(struct cli_def *cli, const char *command, char **argv, int argc)
6296 {
6297 int s, i;
6298 int count = 0;
6299 int buckets[64];
6300
6301 if (CLI_HELP_REQUESTED)
6302 return CLI_HELP_NO_ARGS;
6303
6304 time(&time_now);
6305 for (i = 0; i < 64;++i) buckets[i] = 0;
6306
6307 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6308 {
6309 int idle;
6310 if (!session[s].opened)
6311 continue;
6312
6313 idle = time_now - session[s].last_data;
6314 idle /= 5 ; // In multiples of 5 seconds.
6315 if (idle < 0)
6316 idle = 0;
6317 if (idle > 63)
6318 idle = 63;
6319
6320 ++count;
6321 ++buckets[idle];
6322 }
6323
6324 for (i = 0; i < 63; ++i)
6325 {
6326 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6327 }
6328 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6329 cli_print(cli, "%d total sessions open.", count);
6330 return CLI_OK;
6331 }
6332
6333 int cmd_show_hist_open(struct cli_def *cli, const char *command, char **argv, int argc)
6334 {
6335 int s, i;
6336 int count = 0;
6337 int buckets[64];
6338
6339 if (CLI_HELP_REQUESTED)
6340 return CLI_HELP_NO_ARGS;
6341
6342 time(&time_now);
6343 for (i = 0; i < 64;++i) buckets[i] = 0;
6344
6345 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6346 {
6347 int open = 0, d;
6348 if (!session[s].opened)
6349 continue;
6350
6351 d = time_now - session[s].opened;
6352 if (d < 0)
6353 d = 0;
6354 while (d > 1 && open < 32)
6355 {
6356 ++open;
6357 d >>= 1; // half.
6358 }
6359 ++count;
6360 ++buckets[open];
6361 }
6362
6363 s = 1;
6364 for (i = 0; i < 30; ++i)
6365 {
6366 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6367 s <<= 1;
6368 }
6369 cli_print(cli, "%d total sessions open.", count);
6370 return CLI_OK;
6371 }
6372
6373 /* Unhide an avp.
6374 *
6375 * This unencodes the AVP using the L2TP secret and the previously
6376 * stored random vector. It overwrites the hidden data with the
6377 * unhidden AVP subformat.
6378 */
6379 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6380 {
6381 MD5_CTX ctx;
6382 uint8_t digest[16];
6383 uint8_t *last;
6384 size_t d = 0;
6385 uint16_t m = htons(type);
6386
6387 // Compute initial pad
6388 MD5_Init(&ctx);
6389 MD5_Update(&ctx, (unsigned char *) &m, 2);
6390 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6391 MD5_Update(&ctx, vector, vec_len);
6392 MD5_Final(digest, &ctx);
6393
6394 // pointer to last decoded 16 octets
6395 last = value;
6396
6397 while (len > 0)
6398 {
6399 // calculate a new pad based on the last decoded block
6400 if (d >= sizeof(digest))
6401 {
6402 MD5_Init(&ctx);
6403 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6404 MD5_Update(&ctx, last, sizeof(digest));
6405 MD5_Final(digest, &ctx);
6406
6407 d = 0;
6408 last = value;
6409 }
6410
6411 *value++ ^= digest[d++];
6412 len--;
6413 }
6414 }
6415
6416 int find_filter(char const *name, size_t len)
6417 {
6418 int free = -1;
6419 int i;
6420
6421 for (i = 0; i < MAXFILTER; i++)
6422 {
6423 if (!*ip_filters[i].name)
6424 {
6425 if (free < 0)
6426 free = i;
6427
6428 continue;
6429 }
6430
6431 if (strlen(ip_filters[i].name) != len)
6432 continue;
6433
6434 if (!strncmp(ip_filters[i].name, name, len))
6435 return i;
6436 }
6437
6438 return free;
6439 }
6440
6441 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6442 {
6443 switch (p->op)
6444 {
6445 case FILTER_PORT_OP_EQ: return port == p->port;
6446 case FILTER_PORT_OP_NEQ: return port != p->port;
6447 case FILTER_PORT_OP_GT: return port > p->port;
6448 case FILTER_PORT_OP_LT: return port < p->port;
6449 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6450 }
6451
6452 return 0;
6453 }
6454
6455 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6456 {
6457 switch (op)
6458 {
6459 case FILTER_FLAG_OP_ANY:
6460 return (flags & sflags) || (~flags & cflags);
6461
6462 case FILTER_FLAG_OP_ALL:
6463 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6464
6465 case FILTER_FLAG_OP_EST:
6466 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6467 }
6468
6469 return 0;
6470 }
6471
6472 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6473 {
6474 uint16_t frag_offset;
6475 uint8_t proto;
6476 in_addr_t src_ip;
6477 in_addr_t dst_ip;
6478 uint16_t src_port = 0;
6479 uint16_t dst_port = 0;
6480 uint8_t flags = 0;
6481 ip_filter_rulet *rule;
6482
6483 if (len < 20) // up to end of destination address
6484 return 0;
6485
6486 if ((*buf >> 4) != 4) // IPv4
6487 return 0;
6488
6489 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6490 proto = buf[9];
6491 src_ip = *(in_addr_t *) (buf + 12);
6492 dst_ip = *(in_addr_t *) (buf + 16);
6493
6494 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6495 {
6496 int l = (buf[0] & 0xf) * 4; // length of IP header
6497 if (len < l + 4) // ports
6498 return 0;
6499
6500 src_port = ntohs(*(uint16_t *) (buf + l));
6501 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6502 if (proto == IPPROTO_TCP)
6503 {
6504 if (len < l + 14) // flags
6505 return 0;
6506
6507 flags = buf[l + 13] & 0x3f;
6508 }
6509 }
6510
6511 for (rule = ip_filters[filter].rules; rule->action; rule++)
6512 {
6513 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6514 continue;
6515
6516 if (rule->src_wild != INADDR_BROADCAST &&
6517 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6518 continue;
6519
6520 if (rule->dst_wild != INADDR_BROADCAST &&
6521 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6522 continue;
6523
6524 if (frag_offset)
6525 {
6526 // layer 4 deny rules are skipped
6527 if (rule->action == FILTER_ACTION_DENY &&
6528 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6529 continue;
6530 }
6531 else
6532 {
6533 if (rule->frag)
6534 continue;
6535
6536 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6537 {
6538 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6539 continue;
6540
6541 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6542 continue;
6543
6544 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6545 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6546 continue;
6547 }
6548 }
6549
6550 // matched
6551 rule->counter++;
6552 return rule->action == FILTER_ACTION_PERMIT;
6553 }
6554
6555 // default deny
6556 return 0;
6557 }
6558
6559 tunnelidt lac_new_tunnel()
6560 {
6561 return new_tunnel();
6562 }
6563
6564 void lac_tunnelclear(tunnelidt t)
6565 {
6566 tunnelclear(t);
6567 }
6568
6569 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6570 {
6571 uint16_t version = 0x0100; // protocol version
6572
6573 tunnel[t].state = TUNNELOPENING;
6574
6575 // Sent SCCRQ - Start Control Connection Request
6576 controlt *c = controlnew(1); // sending SCCRQ
6577 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6578 controls(c, 8, Vendor_name, 1); // Vendor name
6579 control16(c, 2, version, 1); // protocol version
6580 control32(c, 3, 3, 1); // framing Capabilities
6581 control16(c, 9, t, 1); // assigned tunnel
6582 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6583 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6584 controladd(c, 0, t); // send
6585 }
6586
6587 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6588 {
6589 // Sent ICRQ Incoming-call-request
6590 controlt *c = controlnew(10); // ICRQ
6591
6592 control16(c, 14, s, 1); // assigned sesion
6593 call_serial_number++;
6594 control32(c, 15, call_serial_number, 1); // call serial number
6595 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6596 controladd(c, 0, t); // send
6597 }
6598
6599 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6600 {
6601 tunnelshutdown(t, reason, result, error, msg);
6602 }
6603