Fix: compiling Warning, dpkg-buildflags ...
[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
1805 uint8_t b[MAXETHER + 20];
1806
1807 if (len < 0 || len > MAXETHER)
1808 {
1809 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1810 return;
1811 }
1812
1813 // Skip the tun header
1814 buf += 4;
1815 len -= 4;
1816
1817 if (!session[s].ip)
1818 return;
1819
1820 t = session[s].tunnel;
1821 sp = &session[s];
1822
1823 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1824
1825 // Add on L2TP header
1826 {
1827 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1828 if (!p) return;
1829 tunnelsend(b, len + (p-b), t); // send it...
1830 }
1831
1832 // Snooping this session.
1833 if (sp->snoop_ip && sp->snoop_port)
1834 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1835
1836 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1837 sp->cout_delta += len;
1838 sp->pout++;
1839 udp_tx += len;
1840
1841 sess_local[s].cout += len; // To send to master..
1842 sess_local[s].pout++;
1843 }
1844
1845 // add an AVP (16 bit)
1846 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1847 {
1848 uint16_t l = (m ? 0x8008 : 0x0008);
1849 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1850 pint16[0] = htons(l);
1851 pint16[1] = htons(0);
1852 pint16[2] = htons(avp);
1853 pint16[3] = htons(val);
1854 c->length += 8;
1855 }
1856
1857 // add an AVP (32 bit)
1858 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1859 {
1860 uint16_t l = (m ? 0x800A : 0x000A);
1861 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1862 uint32_t *pint32 = (uint32_t *) (c->buf + c->length + 6);
1863 pint16[0] = htons(l);
1864 pint16[1] = htons(0);
1865 pint16[2] = htons(avp);
1866 pint32[0] = htonl(val);
1867 c->length += 10;
1868 }
1869
1870 // add an AVP (string)
1871 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1872 {
1873 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1874 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1875 pint16[0] = htons(l);
1876 pint16[1] = htons(0);
1877 pint16[2] = htons(avp);
1878 memcpy(c->buf + c->length + 6, val, strlen(val));
1879 c->length += 6 + strlen(val);
1880 }
1881
1882 // add a binary AVP
1883 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1884 {
1885 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1886 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1887 pint16[0] = htons(l);
1888 pint16[1] = htons(0);
1889 pint16[2] = htons(avp);
1890 memcpy(c->buf + c->length + 6, val, len);
1891 c->length += 6 + len;
1892 }
1893
1894 // new control connection
1895 static controlt *controlnew(uint16_t mtype)
1896 {
1897 controlt *c;
1898 if (!controlfree)
1899 c = malloc(sizeof(controlt));
1900 else
1901 {
1902 c = controlfree;
1903 controlfree = c->next;
1904 }
1905 assert(c);
1906 c->next = 0;
1907 c->buf[0] = 0xC8; // flags
1908 c->buf[1] = 0x02; // ver
1909 c->length = 12;
1910 control16(c, 0, mtype, 1);
1911 return c;
1912 }
1913
1914 // send zero block if nothing is waiting
1915 // (ZLB send).
1916 static void controlnull(tunnelidt t)
1917 {
1918 uint16_t buf[6];
1919 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1920 return;
1921
1922 buf[0] = htons(0xC802); // flags/ver
1923 buf[1] = htons(12); // length
1924 buf[2] = htons(tunnel[t].far); // tunnel
1925 buf[3] = htons(0); // session
1926 buf[4] = htons(tunnel[t].ns); // sequence
1927 buf[5] = htons(tunnel[t].nr); // sequence
1928 tunnelsend((uint8_t *)buf, 12, t);
1929 }
1930
1931 // add a control message to a tunnel, and send if within window
1932 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1933 {
1934 uint16_t *pint16 = (uint16_t *) (c->buf + 2);
1935 pint16[0] = htons(c->length); // length
1936 pint16[1] = htons(tunnel[t].far); // tunnel
1937 pint16[2] = htons(far); // session
1938 pint16[3] = htons(tunnel[t].ns); // sequence
1939 tunnel[t].ns++; // advance sequence
1940 // link in message in to queue
1941 if (tunnel[t].controlc)
1942 tunnel[t].controle->next = c;
1943 else
1944 tunnel[t].controls = c;
1945
1946 tunnel[t].controle = c;
1947 tunnel[t].controlc++;
1948
1949 // send now if space in window
1950 if (tunnel[t].controlc <= tunnel[t].window)
1951 {
1952 tunnel[t].try = 0; // first send
1953 tunnelsend(c->buf, c->length, t);
1954 }
1955 }
1956
1957 //
1958 // Throttle or Unthrottle a session
1959 //
1960 // Throttle the data from/to through a session to no more than
1961 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1962 // user).
1963 //
1964 // If either value is -1, the current value is retained for that
1965 // direction.
1966 //
1967 void throttle_session(sessionidt s, int rate_in, int rate_out)
1968 {
1969 if (!session[s].opened)
1970 return; // No-one home.
1971
1972 if (!*session[s].user)
1973 return; // User not logged in
1974
1975 if (rate_in >= 0)
1976 {
1977 int bytes = rate_in * 1024 / 8; // kbits to bytes
1978 if (session[s].tbf_in)
1979 free_tbf(session[s].tbf_in);
1980
1981 if (rate_in > 0)
1982 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1983 else
1984 session[s].tbf_in = 0;
1985
1986 session[s].throttle_in = rate_in;
1987 }
1988
1989 if (rate_out >= 0)
1990 {
1991 int bytes = rate_out * 1024 / 8;
1992 if (session[s].tbf_out)
1993 free_tbf(session[s].tbf_out);
1994
1995 if (rate_out > 0)
1996 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1997 else
1998 session[s].tbf_out = 0;
1999
2000 session[s].throttle_out = rate_out;
2001 }
2002 }
2003
2004 // add/remove filters from session (-1 = no change)
2005 void filter_session(sessionidt s, int filter_in, int filter_out)
2006 {
2007 if (!session[s].opened)
2008 return; // No-one home.
2009
2010 if (!*session[s].user)
2011 return; // User not logged in
2012
2013 // paranoia
2014 if (filter_in > MAXFILTER) filter_in = -1;
2015 if (filter_out > MAXFILTER) filter_out = -1;
2016 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2017 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2018
2019 if (filter_in >= 0)
2020 {
2021 if (session[s].filter_in)
2022 ip_filters[session[s].filter_in - 1].used--;
2023
2024 if (filter_in > 0)
2025 ip_filters[filter_in - 1].used++;
2026
2027 session[s].filter_in = filter_in;
2028 }
2029
2030 if (filter_out >= 0)
2031 {
2032 if (session[s].filter_out)
2033 ip_filters[session[s].filter_out - 1].used--;
2034
2035 if (filter_out > 0)
2036 ip_filters[filter_out - 1].used++;
2037
2038 session[s].filter_out = filter_out;
2039 }
2040 }
2041
2042 // start tidy shutdown of session
2043 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2044 {
2045 int walled_garden = session[s].walled_garden;
2046 bundleidt b = session[s].bundle;
2047 //delete routes only for last session in bundle (in case of MPPP)
2048 int del_routes = !b || (bundle[b].num_of_links == 1);
2049
2050 CSTAT(sessionshutdown);
2051
2052 if (!session[s].opened)
2053 {
2054 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2055 return; // not a live session
2056 }
2057
2058 if (!session[s].die)
2059 {
2060 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2061 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2062 run_plugins(PLUGIN_KILL_SESSION, &data);
2063 }
2064
2065 if (session[s].ip && !walled_garden && !session[s].die)
2066 {
2067 // RADIUS Stop message
2068 uint16_t r = radiusnew(s);
2069 if (r)
2070 {
2071 // stop, if not already trying
2072 if (radius[r].state != RADIUSSTOP)
2073 {
2074 radius[r].term_cause = term_cause;
2075 radius[r].term_msg = reason;
2076 radiussend(r, RADIUSSTOP);
2077 }
2078 }
2079 else
2080 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2081
2082 // Save counters to dump to accounting file
2083 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2084 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2085 }
2086
2087 if (!session[s].die)
2088 session[s].die = TIME + 150; // Clean up in 15 seconds
2089
2090 if (session[s].ip)
2091 { // IP allocated, clear and unroute
2092 int r;
2093 int routed = 0;
2094 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2095 {
2096 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2097 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2098 routed++;
2099
2100 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2101 session[s].route[r].ip = 0;
2102 }
2103
2104 if (session[s].ip_pool_index == -1) // static ip
2105 {
2106 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2107 session[s].ip = 0;
2108 }
2109 else
2110 free_ip_address(s);
2111
2112 // unroute IPv6, if setup
2113 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2114 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2115
2116 if (b)
2117 {
2118 // This session was part of a bundle
2119 bundle[b].num_of_links--;
2120 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2121 if(bundle[b].num_of_links == 0)
2122 {
2123 bundleclear(b);
2124 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2125 }
2126 else
2127 {
2128 // Adjust the members array to accomodate the new change
2129 uint8_t mem_num = 0;
2130 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2131 if(bundle[b].members[bundle[b].num_of_links] != s)
2132 {
2133 uint8_t ml;
2134 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2135 if(bundle[b].members[ml] == s)
2136 {
2137 mem_num = ml;
2138 break;
2139 }
2140 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2141 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2142
2143 // If the killed session is the first of the bundle,
2144 // the new first session must be stored in the cache_ipmap
2145 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2146 if (mem_num == 0)
2147 {
2148 sessionidt new_s = bundle[b].members[0];
2149
2150 routed = 0;
2151 // Add the route for this session.
2152 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2153 {
2154 int i, prefixlen;
2155 in_addr_t ip;
2156
2157 prefixlen = session[new_s].route[r].prefixlen;
2158 ip = session[new_s].route[r].ip;
2159
2160 if (!prefixlen) prefixlen = 32;
2161 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2162
2163 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2164 cache_ipmap(i, new_s);
2165 }
2166 cache_ipmap(session[new_s].ip, new_s);
2167
2168 // IPV6 route
2169 if (session[new_s].ipv6prefixlen)
2170 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2171 }
2172 }
2173 }
2174
2175 cluster_send_bundle(b);
2176 }
2177 }
2178
2179 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2180 throttle_session(s, 0, 0);
2181
2182 if (cdn_result)
2183 {
2184 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2185 {
2186 pppoe_shutdown_session(s);
2187 }
2188 else
2189 {
2190 // Send CDN
2191 controlt *c = controlnew(14); // sending CDN
2192 if (cdn_error)
2193 {
2194 uint16_t buf[2];
2195 buf[0] = htons(cdn_result);
2196 buf[1] = htons(cdn_error);
2197 controlb(c, 1, (uint8_t *)buf, 4, 1);
2198 }
2199 else
2200 control16(c, 1, cdn_result, 1);
2201
2202 control16(c, 14, s, 1); // assigned session (our end)
2203 controladd(c, session[s].far, session[s].tunnel); // send the message
2204 }
2205 }
2206
2207 // update filter refcounts
2208 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2209 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2210
2211 // clear PPP state
2212 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2213 sess_local[s].lcp.restart = 0;
2214 sess_local[s].ipcp.restart = 0;
2215 sess_local[s].ipv6cp.restart = 0;
2216 sess_local[s].ccp.restart = 0;
2217
2218 cluster_send_session(s);
2219 }
2220
2221 void sendipcp(sessionidt s, tunnelidt t)
2222 {
2223 uint8_t buf[MAXETHER];
2224 uint8_t *q;
2225
2226 CSTAT(sendipcp);
2227 LOG(3, s, t, "IPCP: send ConfigReq\n");
2228
2229 if (!session[s].unique_id)
2230 {
2231 if (!++last_id) ++last_id; // skip zero
2232 session[s].unique_id = last_id;
2233 }
2234
2235 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2236 if (!q) return;
2237
2238 *q = ConfigReq;
2239 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2240 *(uint16_t *) (q + 2) = htons(10); // packet length
2241 q[4] = 3; // ip address option
2242 q[5] = 6; // option length
2243 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2244 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2245 my_address; // send my IP
2246
2247 tunnelsend(buf, 10 + (q - buf), t); // send it
2248 restart_timer(s, ipcp);
2249 }
2250
2251 void sendipv6cp(sessionidt s, tunnelidt t)
2252 {
2253 uint8_t buf[MAXETHER];
2254 uint8_t *q;
2255
2256 CSTAT(sendipv6cp);
2257 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2258
2259 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2260 if (!q) return;
2261
2262 *q = ConfigReq;
2263 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2264 // only send one type
2265 // of request
2266 *(uint16_t *) (q + 2) = htons(14);
2267 q[4] = 1; // interface identifier option
2268 q[5] = 10; // option length
2269 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2270 *(uint32_t *) (q + 10) = 0;
2271 q[13] = 1;
2272
2273 tunnelsend(buf, 14 + (q - buf), t); // send it
2274 restart_timer(s, ipv6cp);
2275 }
2276
2277 static void sessionclear(sessionidt s)
2278 {
2279 memset(&session[s], 0, sizeof(session[s]));
2280 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2281 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2282
2283 session[s].tunnel = T_FREE; // Mark it as free.
2284 session[s].next = sessionfree;
2285 sessionfree = s;
2286 }
2287
2288 // kill a session now
2289 void sessionkill(sessionidt s, char *reason)
2290 {
2291 CSTAT(sessionkill);
2292
2293 if (!session[s].opened) // not alive
2294 return;
2295
2296 if (session[s].next)
2297 {
2298 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2299 return;
2300 }
2301
2302 if (!session[s].die)
2303 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2304
2305 if (sess_local[s].radius)
2306 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2307
2308 if (session[s].forwardtosession)
2309 {
2310 sessionidt sess = session[s].forwardtosession;
2311 if (session[sess].forwardtosession == s)
2312 {
2313 // Shutdown the linked session also.
2314 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2315 }
2316 }
2317
2318 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2319 sessionclear(s);
2320 cluster_send_session(s);
2321 }
2322
2323 static void tunnelclear(tunnelidt t)
2324 {
2325 if (!t) return;
2326 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2327 tunnel[t].state = TUNNELFREE;
2328 }
2329
2330 static void bundleclear(bundleidt b)
2331 {
2332 if (!b) return;
2333 memset(&bundle[b], 0, sizeof(bundle[b]));
2334 bundle[b].state = BUNDLEFREE;
2335 }
2336
2337 // kill a tunnel now
2338 static void tunnelkill(tunnelidt t, char *reason)
2339 {
2340 sessionidt s;
2341 controlt *c;
2342
2343 CSTAT(tunnelkill);
2344
2345 tunnel[t].state = TUNNELDIE;
2346
2347 // free control messages
2348 while ((c = tunnel[t].controls))
2349 {
2350 controlt * n = c->next;
2351 tunnel[t].controls = n;
2352 tunnel[t].controlc--;
2353 c->next = controlfree;
2354 controlfree = c;
2355 }
2356 // kill sessions
2357 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2358 if (session[s].tunnel == t)
2359 sessionkill(s, reason);
2360
2361 // free tunnel
2362 tunnelclear(t);
2363 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2364 cli_tunnel_actions[t].action = 0;
2365 cluster_send_tunnel(t);
2366 }
2367
2368 // shut down a tunnel cleanly
2369 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2370 {
2371 sessionidt s;
2372
2373 CSTAT(tunnelshutdown);
2374
2375 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2376 {
2377 // never set up, can immediately kill
2378 tunnelkill(t, reason);
2379 return;
2380 }
2381 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2382
2383 // close session
2384 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2385 if (session[s].tunnel == t)
2386 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2387
2388 tunnel[t].state = TUNNELDIE;
2389 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2390 cluster_send_tunnel(t);
2391 // TBA - should we wait for sessions to stop?
2392 if (result)
2393 {
2394 controlt *c = controlnew(4); // sending StopCCN
2395 if (error)
2396 {
2397 uint16_t buf[32];
2398 int l = 4;
2399 buf[0] = htons(result);
2400 buf[1] = htons(error);
2401 if (msg)
2402 {
2403 int m = strlen(msg);
2404 if (m + 4 > sizeof(buf))
2405 m = sizeof(buf) - 4;
2406
2407 memcpy(buf+2, msg, m);
2408 l += m;
2409 }
2410
2411 controlb(c, 1, (uint8_t *)buf, l, 1);
2412 }
2413 else
2414 control16(c, 1, result, 1);
2415
2416 control16(c, 9, t, 1); // assigned tunnel (our end)
2417 controladd(c, 0, t); // send the message
2418 }
2419 }
2420
2421 // read and process packet on tunnel (UDP)
2422 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2423 {
2424 uint8_t *sendchalresponse = NULL;
2425 uint8_t *recvchalresponse = NULL;
2426 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2427 uint8_t *p = buf + 2;
2428
2429
2430 CSTAT(processudp);
2431
2432 udp_rx += len;
2433 udp_rx_pkt++;
2434 LOG_HEX(5, "UDP Data", buf, len);
2435 STAT(tunnel_rx_packets);
2436 INC_STAT(tunnel_rx_bytes, len);
2437 if (len < 6)
2438 {
2439 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2440 STAT(tunnel_rx_errors);
2441 return;
2442 }
2443 if ((buf[1] & 0x0F) != 2)
2444 {
2445 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2446 STAT(tunnel_rx_errors);
2447 return;
2448 }
2449 if (*buf & 0x40)
2450 { // length
2451 l = ntohs(*(uint16_t *) p);
2452 p += 2;
2453 }
2454 t = ntohs(*(uint16_t *) p);
2455 p += 2;
2456 s = ntohs(*(uint16_t *) p);
2457 p += 2;
2458 if (s >= MAXSESSION)
2459 {
2460 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2461 STAT(tunnel_rx_errors);
2462 return;
2463 }
2464 if (t >= MAXTUNNEL)
2465 {
2466 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2467 STAT(tunnel_rx_errors);
2468 return;
2469 }
2470 if (t == TUNNEL_ID_PPPOE)
2471 {
2472 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2473 STAT(tunnel_rx_errors);
2474 return;
2475 }
2476 if (*buf & 0x08)
2477 { // ns/nr
2478 ns = ntohs(*(uint16_t *) p);
2479 p += 2;
2480 nr = ntohs(*(uint16_t *) p);
2481 p += 2;
2482 }
2483 if (*buf & 0x02)
2484 { // offset
2485 uint16_t o = ntohs(*(uint16_t *) p);
2486 p += o + 2;
2487 }
2488 if ((p - buf) > l)
2489 {
2490 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2491 STAT(tunnel_rx_errors);
2492 return;
2493 }
2494 l -= (p - buf);
2495
2496 // used to time out old tunnels
2497 if (t && tunnel[t].state == TUNNELOPEN)
2498 tunnel[t].lastrec = time_now;
2499
2500 if (*buf & 0x80)
2501 { // control
2502 uint16_t message = 0xFFFF; // message type
2503 uint8_t fatal = 0;
2504 uint8_t mandatory = 0;
2505 uint16_t asession = 0; // assigned session
2506 uint32_t amagic = 0; // magic number
2507 uint8_t aflags = 0; // flags from last LCF
2508 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2509 char called[MAXTEL] = ""; // called number
2510 char calling[MAXTEL] = ""; // calling number
2511
2512 if (!config->cluster_iam_master)
2513 {
2514 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2515 return;
2516 }
2517
2518 // control messages must have bits 0x80|0x40|0x08
2519 // (type, length and sequence) set, and bits 0x02|0x01
2520 // (offset and priority) clear
2521 if ((*buf & 0xCB) != 0xC8)
2522 {
2523 LOG(1, s, t, "Bad control header %02X\n", *buf);
2524 STAT(tunnel_rx_errors);
2525 return;
2526 }
2527
2528 // check for duplicate tunnel open message
2529 if (!t && ns == 0)
2530 {
2531 int i;
2532
2533 //
2534 // Is this a duplicate of the first packet? (SCCRQ)
2535 //
2536 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2537 {
2538 if (tunnel[i].state != TUNNELOPENING ||
2539 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2540 tunnel[i].port != ntohs(addr->sin_port) )
2541 continue;
2542 t = i;
2543 LOG(3, s, t, "Duplicate SCCRQ?\n");
2544 break;
2545 }
2546 }
2547
2548 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2549 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2550
2551 // if no tunnel specified, assign one
2552 if (!t)
2553 {
2554 if (!(t = new_tunnel()))
2555 {
2556 LOG(1, 0, 0, "No more tunnels\n");
2557 STAT(tunnel_overflow);
2558 return;
2559 }
2560 tunnelclear(t);
2561 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2562 tunnel[t].port = ntohs(addr->sin_port);
2563 tunnel[t].window = 4; // default window
2564 tunnel[t].indexudp = indexudpfd;
2565 STAT(tunnel_created);
2566 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2567 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2568 }
2569
2570 // If the 'ns' just received is not the 'nr' we're
2571 // expecting, just send an ack and drop it.
2572 //
2573 // if 'ns' is less, then we got a retransmitted packet.
2574 // if 'ns' is greater than missed a packet. Either way
2575 // we should ignore it.
2576 if (ns != tunnel[t].nr)
2577 {
2578 // is this the sequence we were expecting?
2579 STAT(tunnel_rx_errors);
2580 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2581 t, ns, tunnel[t].nr);
2582
2583 if (l) // Is this not a ZLB?
2584 controlnull(t);
2585 return;
2586 }
2587
2588 // check sequence of this message
2589 {
2590 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2591 // some to clear maybe?
2592 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2593 {
2594 controlt *c = tunnel[t].controls;
2595 tunnel[t].controls = c->next;
2596 tunnel[t].controlc--;
2597 c->next = controlfree;
2598 controlfree = c;
2599 skip--;
2600 tunnel[t].try = 0; // we have progress
2601 }
2602
2603 // receiver advance (do here so quoted correctly in any sends below)
2604 if (l) tunnel[t].nr = (ns + 1);
2605 if (skip < 0) skip = 0;
2606 if (skip < tunnel[t].controlc)
2607 {
2608 // some control packets can now be sent that were previous stuck out of window
2609 int tosend = tunnel[t].window - skip;
2610 controlt *c = tunnel[t].controls;
2611 while (c && skip)
2612 {
2613 c = c->next;
2614 skip--;
2615 }
2616 while (c && tosend)
2617 {
2618 tunnel[t].try = 0; // first send
2619 tunnelsend(c->buf, c->length, t);
2620 c = c->next;
2621 tosend--;
2622 }
2623 }
2624 if (!tunnel[t].controlc)
2625 tunnel[t].retry = 0; // caught up
2626 }
2627 if (l)
2628 { // if not a null message
2629 int result = 0;
2630 int error = 0;
2631 char *msg = 0;
2632
2633 // Default disconnect cause/message on receipt of CDN. Set to
2634 // more specific value from attribute 1 (result code) or 46
2635 // (disconnect cause) if present below.
2636 int disc_cause_set = 0;
2637 int disc_cause = TERM_NAS_REQUEST;
2638 char const *disc_reason = "Closed (Received CDN).";
2639
2640 // process AVPs
2641 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2642 {
2643 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2644 uint8_t *b = p;
2645 uint8_t flags = *p;
2646 uint16_t mtype;
2647
2648 if (n > l)
2649 {
2650 LOG(1, s, t, "Invalid length in AVP\n");
2651 STAT(tunnel_rx_errors);
2652 return;
2653 }
2654 p += n; // next
2655 l -= n;
2656 if (flags & 0x3C) // reserved bits, should be clear
2657 {
2658 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2659 fatal = flags;
2660 result = 2; // general error
2661 error = 3; // reserved field non-zero
2662 msg = 0;
2663 continue; // next
2664 }
2665 b += 2;
2666 if (*(uint16_t *) (b))
2667 {
2668 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2669 fatal = flags;
2670 result = 2; // general error
2671 error = 6; // generic vendor-specific error
2672 msg = "unsupported vendor-specific";
2673 continue; // next
2674 }
2675 b += 2;
2676 mtype = ntohs(*(uint16_t *) (b));
2677 b += 2;
2678 n -= 6;
2679
2680 if (flags & 0x40)
2681 {
2682 uint16_t orig_len;
2683
2684 // handle hidden AVPs
2685 if (!*config->l2tp_secret)
2686 {
2687 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2688 fatal = flags;
2689 result = 2; // general error
2690 error = 6; // generic vendor-specific error
2691 msg = "secret not specified";
2692 continue;
2693 }
2694 if (!session[s].random_vector_length)
2695 {
2696 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2697 fatal = flags;
2698 result = 2; // general error
2699 error = 6; // generic
2700 msg = "no random vector";
2701 continue;
2702 }
2703 if (n < 8)
2704 {
2705 LOG(2, s, t, "Short hidden AVP.\n");
2706 fatal = flags;
2707 result = 2; // general error
2708 error = 2; // length is wrong
2709 msg = 0;
2710 continue;
2711 }
2712
2713 // Unhide the AVP
2714 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2715
2716 orig_len = ntohs(*(uint16_t *) b);
2717 if (orig_len > n + 2)
2718 {
2719 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2720 orig_len, n);
2721
2722 fatal = flags;
2723 result = 2; // general error
2724 error = 2; // length is wrong
2725 msg = 0;
2726 continue;
2727 }
2728
2729 b += 2;
2730 n = orig_len;
2731 }
2732
2733 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2734 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2735
2736 switch (mtype)
2737 {
2738 case 0: // message type
2739 message = ntohs(*(uint16_t *) b);
2740 mandatory = flags & 0x80;
2741 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2742 break;
2743 case 1: // result code
2744 {
2745 uint16_t rescode = ntohs(*(uint16_t *) b);
2746 char const *resdesc = "(unknown)";
2747 char const *errdesc = NULL;
2748 int cause = 0;
2749
2750 if (message == 4)
2751 { /* StopCCN */
2752 resdesc = l2tp_stopccn_result_code(rescode);
2753 cause = TERM_LOST_SERVICE;
2754 }
2755 else if (message == 14)
2756 { /* CDN */
2757 resdesc = l2tp_cdn_result_code(rescode);
2758 if (rescode == 1)
2759 cause = TERM_LOST_CARRIER;
2760 else
2761 cause = TERM_ADMIN_RESET;
2762 }
2763
2764 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2765 if (n >= 4)
2766 {
2767 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2768 errdesc = l2tp_error_code(errcode);
2769 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2770 }
2771 if (n > 4)
2772 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2773
2774 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2775 {
2776 disc_cause_set = mtype;
2777 disc_reason = errdesc ? errdesc : resdesc;
2778 disc_cause = cause;
2779 }
2780
2781 break;
2782 }
2783 break;
2784 case 2: // protocol version
2785 {
2786 version = ntohs(*(uint16_t *) (b));
2787 LOG(4, s, t, " Protocol version = %u\n", version);
2788 if (version && version != 0x0100)
2789 { // allow 0.0 and 1.0
2790 LOG(1, s, t, " Bad protocol version %04X\n", version);
2791 fatal = flags;
2792 result = 5; // unspported protocol version
2793 error = 0x0100; // supported version
2794 msg = 0;
2795 continue; // next
2796 }
2797 }
2798 break;
2799 case 3: // framing capabilities
2800 break;
2801 case 4: // bearer capabilities
2802 break;
2803 case 5: // tie breaker
2804 // We never open tunnels, so we don't care about tie breakers
2805 continue;
2806 case 6: // firmware revision
2807 break;
2808 case 7: // host name
2809 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2810 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2811 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2812 // TBA - to send to RADIUS
2813 break;
2814 case 8: // vendor name
2815 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2816 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2817 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2818 break;
2819 case 9: // assigned tunnel
2820 tunnel[t].far = ntohs(*(uint16_t *) (b));
2821 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2822 break;
2823 case 10: // rx window
2824 tunnel[t].window = ntohs(*(uint16_t *) (b));
2825 if (!tunnel[t].window)
2826 tunnel[t].window = 1; // window of 0 is silly
2827 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2828 break;
2829 case 11: // Request Challenge
2830 {
2831 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2832 if (message == 1)
2833 build_chap_response(b, 2, n, &sendchalresponse);
2834 else if (message == 2)
2835 build_chap_response(b, 3, n, &sendchalresponse);
2836 }
2837 break;
2838 case 13: // receive challenge Response
2839 if (tunnel[t].isremotelns)
2840 {
2841 recvchalresponse = calloc(17, 1);
2842 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2843 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2844 }
2845 else
2846 // Why did they send a response? We never challenge.
2847 LOG(2, s, t, " received unexpected challenge response\n");
2848 break;
2849
2850 case 14: // assigned session
2851 asession = session[s].far = ntohs(*(uint16_t *) (b));
2852 LOG(4, s, t, " assigned session = %u\n", asession);
2853 break;
2854 case 15: // call serial number
2855 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2856 break;
2857 case 18: // bearer type
2858 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2859 // TBA - for RADIUS
2860 break;
2861 case 19: // framing type
2862 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2863 // TBA
2864 break;
2865 case 21: // called number
2866 memset(called, 0, sizeof(called));
2867 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2868 LOG(4, s, t, " Called <%s>\n", called);
2869 break;
2870 case 22: // calling number
2871 memset(calling, 0, sizeof(calling));
2872 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2873 LOG(4, s, t, " Calling <%s>\n", calling);
2874 break;
2875 case 23: // subtype
2876 break;
2877 case 24: // tx connect speed
2878 if (n == 4)
2879 {
2880 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2881 }
2882 else
2883 {
2884 // AS5300s send connect speed as a string
2885 char tmp[30];
2886 memset(tmp, 0, sizeof(tmp));
2887 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2888 session[s].tx_connect_speed = atol(tmp);
2889 }
2890 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2891 break;
2892 case 38: // rx connect speed
2893 if (n == 4)
2894 {
2895 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2896 }
2897 else
2898 {
2899 // AS5300s send connect speed as a string
2900 char tmp[30];
2901 memset(tmp, 0, sizeof(tmp));
2902 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2903 session[s].rx_connect_speed = atol(tmp);
2904 }
2905 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2906 break;
2907 case 25: // Physical Channel ID
2908 {
2909 uint32_t tmp = ntohl(*(uint32_t *) b);
2910 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2911 break;
2912 }
2913 case 29: // Proxy Authentication Type
2914 {
2915 uint16_t atype = ntohs(*(uint16_t *)b);
2916 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2917 break;
2918 }
2919 case 30: // Proxy Authentication Name
2920 {
2921 char authname[64];
2922 memset(authname, 0, sizeof(authname));
2923 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2924 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2925 authname);
2926 break;
2927 }
2928 case 31: // Proxy Authentication Challenge
2929 {
2930 LOG(4, s, t, " Proxy Auth Challenge\n");
2931 break;
2932 }
2933 case 32: // Proxy Authentication ID
2934 {
2935 uint16_t authid = ntohs(*(uint16_t *)(b));
2936 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2937 break;
2938 }
2939 case 33: // Proxy Authentication Response
2940 LOG(4, s, t, " Proxy Auth Response\n");
2941 break;
2942 case 27: // last sent lcp
2943 { // find magic number
2944 uint8_t *p = b, *e = p + n;
2945 while (p + 1 < e && p[1] && p + p[1] <= e)
2946 {
2947 if (*p == 5 && p[1] == 6) // Magic-Number
2948 amagic = ntohl(*(uint32_t *) (p + 2));
2949 else if (*p == 7) // Protocol-Field-Compression
2950 aflags |= SESSION_PFC;
2951 else if (*p == 8) // Address-and-Control-Field-Compression
2952 aflags |= SESSION_ACFC;
2953 p += p[1];
2954 }
2955 }
2956 break;
2957 case 28: // last recv lcp confreq
2958 break;
2959 case 26: // Initial Received LCP CONFREQ
2960 break;
2961 case 39: // seq required - we control it as an LNS anyway...
2962 break;
2963 case 36: // Random Vector
2964 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2965 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2966 if (n > sizeof(session[s].random_vector))
2967 n = sizeof(session[s].random_vector);
2968 memcpy(session[s].random_vector, b, n);
2969 session[s].random_vector_length = n;
2970 break;
2971 case 46: // ppp disconnect cause
2972 if (n >= 5)
2973 {
2974 uint16_t code = ntohs(*(uint16_t *) b);
2975 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2976 uint8_t dir = *(b + 4);
2977
2978 LOG(4, s, t, " PPP disconnect cause "
2979 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2980 code, proto, dir, n - 5, b + 5);
2981
2982 disc_cause_set = mtype;
2983
2984 switch (code)
2985 {
2986 case 1: // admin disconnect
2987 disc_cause = TERM_ADMIN_RESET;
2988 disc_reason = "Administrative disconnect";
2989 break;
2990 case 3: // lcp terminate
2991 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2992 disc_cause = TERM_USER_REQUEST;
2993 disc_reason = "Normal disconnection";
2994 break;
2995 case 4: // compulsory encryption unavailable
2996 if (dir != 1) break; // 1=refused by peer, 2=local
2997 disc_cause = TERM_USER_ERROR;
2998 disc_reason = "Compulsory encryption refused";
2999 break;
3000 case 5: // lcp: fsm timeout
3001 disc_cause = TERM_PORT_ERROR;
3002 disc_reason = "LCP: FSM timeout";
3003 break;
3004 case 6: // lcp: no recognisable lcp packets received
3005 disc_cause = TERM_PORT_ERROR;
3006 disc_reason = "LCP: no recognisable LCP packets";
3007 break;
3008 case 7: // lcp: magic-no error (possibly looped back)
3009 disc_cause = TERM_PORT_ERROR;
3010 disc_reason = "LCP: magic-no error (possible loop)";
3011 break;
3012 case 8: // lcp: echo request timeout
3013 disc_cause = TERM_PORT_ERROR;
3014 disc_reason = "LCP: echo request timeout";
3015 break;
3016 case 13: // auth: fsm timeout
3017 disc_cause = TERM_SERVICE_UNAVAILABLE;
3018 disc_reason = "Authentication: FSM timeout";
3019 break;
3020 case 15: // auth: unacceptable auth protocol
3021 disc_cause = TERM_SERVICE_UNAVAILABLE;
3022 disc_reason = "Unacceptable authentication protocol";
3023 break;
3024 case 16: // auth: authentication failed
3025 disc_cause = TERM_SERVICE_UNAVAILABLE;
3026 disc_reason = "Authentication failed";
3027 break;
3028 case 17: // ncp: fsm timeout
3029 disc_cause = TERM_SERVICE_UNAVAILABLE;
3030 disc_reason = "NCP: FSM timeout";
3031 break;
3032 case 18: // ncp: no ncps available
3033 disc_cause = TERM_SERVICE_UNAVAILABLE;
3034 disc_reason = "NCP: no NCPs available";
3035 break;
3036 case 19: // ncp: failure to converge on acceptable address
3037 disc_cause = TERM_SERVICE_UNAVAILABLE;
3038 disc_reason = (dir == 1)
3039 ? "NCP: too many Configure-Naks received from peer"
3040 : "NCP: too many Configure-Naks sent to peer";
3041 break;
3042 case 20: // ncp: user not permitted to use any address
3043 disc_cause = TERM_SERVICE_UNAVAILABLE;
3044 disc_reason = (dir == 1)
3045 ? "NCP: local link address not acceptable to peer"
3046 : "NCP: remote link address not acceptable";
3047 break;
3048 }
3049 }
3050 break;
3051 default:
3052 {
3053 static char e[] = "unknown AVP 0xXXXX";
3054 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3055 fatal = flags;
3056 result = 2; // general error
3057 error = 8; // unknown mandatory AVP
3058 sprintf((msg = e) + 14, "%04x", mtype);
3059 continue; // next
3060 }
3061 }
3062 }
3063 // process message
3064 if (fatal & 0x80)
3065 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3066 else
3067 switch (message)
3068 {
3069 case 1: // SCCRQ - Start Control Connection Request
3070 tunnel[t].state = TUNNELOPENING;
3071 LOG(3, s, t, "Received SCCRQ\n");
3072 if (main_quit != QUIT_SHUTDOWN)
3073 {
3074 LOG(3, s, t, "sending SCCRP\n");
3075 controlt *c = controlnew(2); // sending SCCRP
3076 control16(c, 2, version, 1); // protocol version
3077 control32(c, 3, 3, 1); // framing
3078 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3079 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3080 control16(c, 9, t, 1); // assigned tunnel
3081 controladd(c, 0, t); // send the resply
3082 }
3083 else
3084 {
3085 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3086 }
3087 break;
3088 case 2: // SCCRP
3089 tunnel[t].state = TUNNELOPEN;
3090 tunnel[t].lastrec = time_now;
3091 LOG(3, s, t, "Received SCCRP\n");
3092 if (main_quit != QUIT_SHUTDOWN)
3093 {
3094 if (tunnel[t].isremotelns && recvchalresponse)
3095 {
3096 hasht hash;
3097
3098 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3099 // check authenticator
3100 if (memcmp(hash, recvchalresponse, 16) == 0)
3101 {
3102 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3103 controlt *c = controlnew(3); // sending SCCCN
3104 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3105 controls(c, 8, Vendor_name, 1); // Vendor name
3106 control16(c, 2, version, 1); // protocol version
3107 control32(c, 3, 3, 1); // framing Capabilities
3108 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3109 control16(c, 9, t, 1); // assigned tunnel
3110 controladd(c, 0, t); // send
3111 }
3112 else
3113 {
3114 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3115 }
3116 }
3117 }
3118 else
3119 {
3120 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3121 }
3122 break;
3123 case 3: // SCCN
3124 LOG(3, s, t, "Received SCCN\n");
3125 tunnel[t].state = TUNNELOPEN;
3126 tunnel[t].lastrec = time_now;
3127 controlnull(t); // ack
3128 break;
3129 case 4: // StopCCN
3130 LOG(3, s, t, "Received StopCCN\n");
3131 controlnull(t); // ack
3132 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3133 break;
3134 case 6: // HELLO
3135 LOG(3, s, t, "Received HELLO\n");
3136 controlnull(t); // simply ACK
3137 break;
3138 case 7: // OCRQ
3139 // TBA
3140 LOG(3, s, t, "Received OCRQ\n");
3141 break;
3142 case 8: // OCRO
3143 // TBA
3144 LOG(3, s, t, "Received OCRO\n");
3145 break;
3146 case 9: // OCCN
3147 // TBA
3148 LOG(3, s, t, "Received OCCN\n");
3149 break;
3150 case 10: // ICRQ
3151 LOG(3, s, t, "Received ICRQ\n");
3152 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3153 {
3154 controlt *c = controlnew(11); // ICRP
3155
3156 LOG(3, s, t, "Sending ICRP\n");
3157
3158 s = sessionfree;
3159 sessionfree = session[s].next;
3160 memset(&session[s], 0, sizeof(session[s]));
3161
3162 if (s > config->cluster_highest_sessionid)
3163 config->cluster_highest_sessionid = s;
3164
3165 session[s].opened = time_now;
3166 session[s].tunnel = t;
3167 session[s].far = asession;
3168 session[s].last_packet = session[s].last_data = time_now;
3169 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3170 control16(c, 14, s, 1); // assigned session
3171 controladd(c, asession, t); // send the reply
3172
3173 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3174 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3175
3176 session[s].ppp.phase = Establish;
3177 session[s].ppp.lcp = Starting;
3178
3179 STAT(session_created);
3180 break;
3181 }
3182
3183 {
3184 controlt *c = controlnew(14); // CDN
3185 LOG(3, s, t, "Sending CDN\n");
3186 if (!sessionfree)
3187 {
3188 STAT(session_overflow);
3189 LOG(1, 0, t, "No free sessions\n");
3190 control16(c, 1, 4, 0); // temporary lack of resources
3191 }
3192 else
3193 control16(c, 1, 2, 7); // shutting down, try another
3194
3195 controladd(c, asession, t); // send the message
3196 }
3197 return;
3198 case 11: // ICRP
3199 LOG(3, s, t, "Received ICRP\n");
3200 if (session[s].forwardtosession)
3201 {
3202 controlt *c = controlnew(12); // ICCN
3203
3204 session[s].opened = time_now;
3205 session[s].tunnel = t;
3206 session[s].far = asession;
3207 session[s].last_packet = session[s].last_data = time_now;
3208
3209 control32(c, 19, 1, 1); // Framing Type
3210 control32(c, 24, 10000000, 1); // Tx Connect Speed
3211 controladd(c, asession, t); // send the message
3212 LOG(3, s, t, "Sending ICCN\n");
3213 }
3214 break;
3215 case 12: // ICCN
3216 LOG(3, s, t, "Received ICCN\n");
3217 if (amagic == 0) amagic = time_now;
3218 session[s].magic = amagic; // set magic number
3219 session[s].flags = aflags; // set flags received
3220 session[s].mru = PPPoE_MRU; // default
3221 controlnull(t); // ack
3222
3223 // start LCP
3224 sess_local[s].lcp_authtype = config->radius_authprefer;
3225 sess_local[s].ppp_mru = MRU;
3226
3227 // Set multilink options before sending initial LCP packet
3228 sess_local[s].mp_mrru = 1614;
3229 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3230
3231 sendlcp(s, t);
3232 change_state(s, lcp, RequestSent);
3233 break;
3234
3235 case 14: // CDN
3236 LOG(3, s, t, "Received CDN\n");
3237 controlnull(t); // ack
3238 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3239 break;
3240 case 0xFFFF:
3241 LOG(1, s, t, "Missing message type\n");
3242 break;
3243 default:
3244 STAT(tunnel_rx_errors);
3245 if (mandatory)
3246 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3247 else
3248 LOG(1, s, t, "Unknown message type %u\n", message);
3249 break;
3250 }
3251 if (sendchalresponse) free(sendchalresponse);
3252 if (recvchalresponse) free(recvchalresponse);
3253 cluster_send_tunnel(t);
3254 }
3255 else
3256 {
3257 LOG(4, s, t, " Got a ZLB ack\n");
3258 }
3259 }
3260 else
3261 { // data
3262 uint16_t proto;
3263
3264 LOG_HEX(5, "Receive Tunnel Data", p, l);
3265 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3266 { // HDLC address header, discard
3267 p += 2;
3268 l -= 2;
3269 }
3270 if (l < 2)
3271 {
3272 LOG(1, s, t, "Short ppp length %d\n", l);
3273 STAT(tunnel_rx_errors);
3274 return;
3275 }
3276 if (*p & 1)
3277 {
3278 proto = *p++;
3279 l--;
3280 }
3281 else
3282 {
3283 proto = ntohs(*(uint16_t *) p);
3284 p += 2;
3285 l -= 2;
3286 }
3287
3288 if (session[s].forwardtosession)
3289 {
3290 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3291 // Forward to LAC/BAS or Remote LNS session
3292 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3293 return;
3294 }
3295 else if (config->auth_tunnel_change_addr_src)
3296 {
3297 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3298 tunnel[t].port == ntohs(addr->sin_port))
3299 {
3300 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3301 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3302 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3303
3304 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3305 }
3306 }
3307
3308 if (s && !session[s].opened) // Is something wrong??
3309 {
3310 if (!config->cluster_iam_master)
3311 {
3312 // Pass it off to the master to deal with..
3313 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3314 return;
3315 }
3316
3317 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3318 STAT(tunnel_rx_errors);
3319 return;
3320 }
3321
3322 if (proto == PPPPAP)
3323 {
3324 session[s].last_packet = time_now;
3325 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3326 processpap(s, t, p, l);
3327 }
3328 else if (proto == PPPCHAP)
3329 {
3330 session[s].last_packet = time_now;
3331 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3332 processchap(s, t, p, l);
3333 }
3334 else if (proto == PPPLCP)
3335 {
3336 session[s].last_packet = time_now;
3337 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3338 processlcp(s, t, p, l);
3339 }
3340 else if (proto == PPPIPCP)
3341 {
3342 session[s].last_packet = time_now;
3343 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3344 processipcp(s, t, p, l);
3345 }
3346 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3347 {
3348 session[s].last_packet = time_now;
3349 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3350 processipv6cp(s, t, p, l);
3351 }
3352 else if (proto == PPPCCP)
3353 {
3354 session[s].last_packet = time_now;
3355 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3356 processccp(s, t, p, l);
3357 }
3358 else if (proto == PPPIP)
3359 {
3360 if (session[s].die)
3361 {
3362 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3363 return; // closing session, PPP not processed
3364 }
3365
3366 session[s].last_packet = session[s].last_data = time_now;
3367 if (session[s].walled_garden && !config->cluster_iam_master)
3368 {
3369 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3370 return;
3371 }
3372
3373 processipin(s, t, p, l);
3374 }
3375 else if (proto == PPPMP)
3376 {
3377 if (session[s].die)
3378 {
3379 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3380 return; // closing session, PPP not processed
3381 }
3382
3383 session[s].last_packet = session[s].last_data = time_now;
3384 if (!config->cluster_iam_master)
3385 {
3386 // The fragments reconstruction is managed by the Master.
3387 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3388 return;
3389 }
3390
3391 processmpin(s, t, p, l);
3392 }
3393 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3394 {
3395 if (session[s].die)
3396 {
3397 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3398 return; // closing session, PPP not processed
3399 }
3400
3401 session[s].last_packet = session[s].last_data = time_now;
3402 if (session[s].walled_garden && !config->cluster_iam_master)
3403 {
3404 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3405 return;
3406 }
3407
3408 processipv6in(s, t, p, l);
3409 }
3410 else if (session[s].ppp.lcp == Opened)
3411 {
3412 session[s].last_packet = time_now;
3413 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3414 protoreject(s, t, p, l, proto);
3415 }
3416 else
3417 {
3418 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3419 proto, ppp_state(session[s].ppp.lcp));
3420 }
3421 }
3422 }
3423
3424 // read and process packet on tun
3425 // (i.e. this routine writes to buf[-8]).
3426 static void processtun(uint8_t * buf, int len)
3427 {
3428 LOG_HEX(5, "Receive TUN Data", buf, len);
3429 STAT(tun_rx_packets);
3430 INC_STAT(tun_rx_bytes, len);
3431
3432 CSTAT(processtun);
3433
3434 eth_rx_pkt++;
3435 eth_rx += len;
3436 if (len < 22)
3437 {
3438 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3439 STAT(tun_rx_errors);
3440 return;
3441 }
3442
3443 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3444 processipout(buf, len);
3445 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3446 && config->ipv6_prefix.s6_addr[0])
3447 processipv6out(buf, len);
3448
3449 // Else discard.
3450 }
3451
3452 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3453 // that we look at the whole of the tunnel, radius and session tables
3454 // every second
3455 static void regular_cleanups(double period)
3456 {
3457 // Next tunnel, radius and session to check for actions on.
3458 static tunnelidt t = 0;
3459 static int r = 0;
3460 static sessionidt s = 0;
3461
3462 int t_actions = 0;
3463 int r_actions = 0;
3464 int s_actions = 0;
3465
3466 int t_slice;
3467 int r_slice;
3468 int s_slice;
3469
3470 int i;
3471 int a;
3472
3473 // divide up tables into slices based on the last run
3474 t_slice = config->cluster_highest_tunnelid * period;
3475 r_slice = (MAXRADIUS - 1) * period;
3476 s_slice = config->cluster_highest_sessionid * period;
3477
3478 if (t_slice < 1)
3479 t_slice = 1;
3480 else if (t_slice > config->cluster_highest_tunnelid)
3481 t_slice = config->cluster_highest_tunnelid;
3482
3483 if (r_slice < 1)
3484 r_slice = 1;
3485 else if (r_slice > (MAXRADIUS - 1))
3486 r_slice = MAXRADIUS - 1;
3487
3488 if (s_slice < 1)
3489 s_slice = 1;
3490 else if (s_slice > config->cluster_highest_sessionid)
3491 s_slice = config->cluster_highest_sessionid;
3492
3493 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3494
3495 for (i = 0; i < t_slice; i++)
3496 {
3497 t++;
3498 if (t > config->cluster_highest_tunnelid)
3499 t = 1;
3500
3501 if (t == TUNNEL_ID_PPPOE)
3502 continue;
3503
3504 // check for expired tunnels
3505 if (tunnel[t].die && tunnel[t].die <= TIME)
3506 {
3507 STAT(tunnel_timeout);
3508 tunnelkill(t, "Expired");
3509 t_actions++;
3510 continue;
3511 }
3512 // check for message resend
3513 if (tunnel[t].retry && tunnel[t].controlc)
3514 {
3515 // resend pending messages as timeout on reply
3516 if (tunnel[t].retry <= TIME)
3517 {
3518 controlt *c = tunnel[t].controls;
3519 uint16_t w = tunnel[t].window;
3520 tunnel[t].try++; // another try
3521 if (tunnel[t].try > 5)
3522 tunnelkill(t, "Timeout on control message"); // game over
3523 else
3524 while (c && w--)
3525 {
3526 tunnelsend(c->buf, c->length, t);
3527 c = c->next;
3528 }
3529
3530 t_actions++;
3531 }
3532 }
3533 // Send hello
3534 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3535 {
3536 if (!config->disable_sending_hello)
3537 {
3538 controlt *c = controlnew(6); // sending HELLO
3539 controladd(c, 0, t); // send the message
3540 LOG(3, 0, t, "Sending HELLO message\n");
3541 t_actions++;
3542 }
3543 }
3544
3545 // Check for tunnel changes requested from the CLI
3546 if ((a = cli_tunnel_actions[t].action))
3547 {
3548 cli_tunnel_actions[t].action = 0;
3549 if (a & CLI_TUN_KILL)
3550 {
3551 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3552 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3553 t_actions++;
3554 }
3555 }
3556 }
3557
3558 for (i = 0; i < r_slice; i++)
3559 {
3560 r++;
3561 if (r >= MAXRADIUS)
3562 r = 1;
3563
3564 if (!radius[r].state)
3565 continue;
3566
3567 if (radius[r].retry <= TIME)
3568 {
3569 radiusretry(r);
3570 r_actions++;
3571 }
3572 }
3573
3574 for (i = 0; i < s_slice; i++)
3575 {
3576 s++;
3577 if (s > config->cluster_highest_sessionid)
3578 s = 1;
3579
3580 if (!session[s].opened) // Session isn't in use
3581 continue;
3582
3583 // check for expired sessions
3584 if (session[s].die)
3585 {
3586 if (session[s].die <= TIME)
3587 {
3588 sessionkill(s, "Expired");
3589 s_actions++;
3590 }
3591 continue;
3592 }
3593
3594 // PPP timeouts
3595 if (sess_local[s].lcp.restart <= time_now)
3596 {
3597 int next_state = session[s].ppp.lcp;
3598 switch (session[s].ppp.lcp)
3599 {
3600 case RequestSent:
3601 case AckReceived:
3602 next_state = RequestSent;
3603
3604 case AckSent:
3605 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3606 {
3607 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3608 sendlcp(s, session[s].tunnel);
3609 change_state(s, lcp, next_state);
3610 }
3611 else
3612 {
3613 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3614 STAT(session_timeout);
3615 }
3616
3617 s_actions++;
3618 }
3619
3620 if (session[s].die)
3621 continue;
3622 }
3623
3624 if (sess_local[s].ipcp.restart <= time_now)
3625 {
3626 int next_state = session[s].ppp.ipcp;
3627 switch (session[s].ppp.ipcp)
3628 {
3629 case RequestSent:
3630 case AckReceived:
3631 next_state = RequestSent;
3632
3633 case AckSent:
3634 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3635 {
3636 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3637 sendipcp(s, session[s].tunnel);
3638 change_state(s, ipcp, next_state);
3639 }
3640 else
3641 {
3642 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3643 STAT(session_timeout);
3644 }
3645
3646 s_actions++;
3647 }
3648
3649 if (session[s].die)
3650 continue;
3651 }
3652
3653 if (sess_local[s].ipv6cp.restart <= time_now)
3654 {
3655 int next_state = session[s].ppp.ipv6cp;
3656 switch (session[s].ppp.ipv6cp)
3657 {
3658 case RequestSent:
3659 case AckReceived:
3660 next_state = RequestSent;
3661
3662 case AckSent:
3663 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3664 {
3665 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3666 sendipv6cp(s, session[s].tunnel);
3667 change_state(s, ipv6cp, next_state);
3668 }
3669 else
3670 {
3671 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3672 change_state(s, ipv6cp, Stopped);
3673 }
3674
3675 s_actions++;
3676 }
3677 }
3678
3679 if (sess_local[s].ccp.restart <= time_now)
3680 {
3681 int next_state = session[s].ppp.ccp;
3682 switch (session[s].ppp.ccp)
3683 {
3684 case RequestSent:
3685 case AckReceived:
3686 next_state = RequestSent;
3687
3688 case AckSent:
3689 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3690 {
3691 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3692 sendccp(s, session[s].tunnel);
3693 change_state(s, ccp, next_state);
3694 }
3695 else
3696 {
3697 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3698 change_state(s, ccp, Stopped);
3699 }
3700
3701 s_actions++;
3702 }
3703 }
3704
3705 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3706 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3707 {
3708 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3709 STAT(session_timeout);
3710 s_actions++;
3711 continue;
3712 }
3713
3714 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3715 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3716 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3717 {
3718 uint8_t b[MAXETHER];
3719
3720 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3721 if (!q) continue;
3722
3723 *q = EchoReq;
3724 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3725 *(uint16_t *)(q + 2) = htons(8); // Length
3726 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3727
3728 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3729 (int)(time_now - session[s].last_packet));
3730
3731 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3732 sess_local[s].last_echo = time_now;
3733 s_actions++;
3734 }
3735
3736 // Drop sessions who have reached session_timeout seconds
3737 if (session[s].session_timeout)
3738 {
3739 bundleidt bid = session[s].bundle;
3740 if (bid)
3741 {
3742 if (time_now - bundle[bid].last_check >= 1)
3743 {
3744 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3745 bundle[bid].last_check = time_now;
3746 if (bundle[bid].online_time >= session[s].session_timeout)
3747 {
3748 int ses;
3749 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3750 {
3751 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3752 s_actions++;
3753 continue;
3754 }
3755 }
3756 }
3757 }
3758 else if (time_now - session[s].opened >= session[s].session_timeout)
3759 {
3760 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3761 s_actions++;
3762 continue;
3763 }
3764 }
3765
3766 // Drop sessions who have reached idle_timeout seconds
3767 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3768 {
3769 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3770 STAT(session_timeout);
3771 s_actions++;
3772 continue;
3773 }
3774
3775 // Check for actions requested from the CLI
3776 if ((a = cli_session_actions[s].action))
3777 {
3778 int send = 0;
3779
3780 cli_session_actions[s].action = 0;
3781 if (a & CLI_SESS_KILL)
3782 {
3783 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3784 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3785 a = 0; // dead, no need to check for other actions
3786 s_actions++;
3787 }
3788
3789 if (a & CLI_SESS_NOSNOOP)
3790 {
3791 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3792 session[s].snoop_ip = 0;
3793 session[s].snoop_port = 0;
3794 s_actions++;
3795 send++;
3796 }
3797 else if (a & CLI_SESS_SNOOP)
3798 {
3799 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3800 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3801 cli_session_actions[s].snoop_port);
3802
3803 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3804 session[s].snoop_port = cli_session_actions[s].snoop_port;
3805 s_actions++;
3806 send++;
3807 }
3808
3809 if (a & CLI_SESS_NOTHROTTLE)
3810 {
3811 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3812 throttle_session(s, 0, 0);
3813 s_actions++;
3814 send++;
3815 }
3816 else if (a & CLI_SESS_THROTTLE)
3817 {
3818 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3819 cli_session_actions[s].throttle_in,
3820 cli_session_actions[s].throttle_out);
3821
3822 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3823 s_actions++;
3824 send++;
3825 }
3826
3827 if (a & CLI_SESS_NOFILTER)
3828 {
3829 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3830 filter_session(s, 0, 0);
3831 s_actions++;
3832 send++;
3833 }
3834 else if (a & CLI_SESS_FILTER)
3835 {
3836 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3837 cli_session_actions[s].filter_in,
3838 cli_session_actions[s].filter_out);
3839
3840 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3841 s_actions++;
3842 send++;
3843 }
3844
3845 if (send)
3846 cluster_send_session(s);
3847 }
3848
3849 // RADIUS interim accounting
3850 if (config->radius_accounting && config->radius_interim > 0
3851 && session[s].ip && !session[s].walled_garden
3852 && !sess_local[s].radius // RADIUS already in progress
3853 && time_now - sess_local[s].last_interim >= config->radius_interim
3854 && session[s].flags & SESSION_STARTED)
3855 {
3856 int rad = radiusnew(s);
3857 if (!rad)
3858 {
3859 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3860 STAT(radius_overflow);
3861 continue;
3862 }
3863
3864 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3865 session[s].user, session[s].unique_id);
3866
3867 radiussend(rad, RADIUSINTERIM);
3868 sess_local[s].last_interim = time_now;
3869 s_actions++;
3870 }
3871 }
3872
3873 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3874 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3875 }
3876
3877 //
3878 // Are we in the middle of a tunnel update, or radius
3879 // requests??
3880 //
3881 static int still_busy(void)
3882 {
3883 int i;
3884 static clockt last_talked = 0;
3885 static clockt start_busy_wait = 0;
3886
3887 #ifdef BGP
3888 static time_t stopped_bgp = 0;
3889 if (bgp_configured)
3890 {
3891 if (!stopped_bgp)
3892 {
3893 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3894
3895 for (i = 0; i < BGP_NUM_PEERS; i++)
3896 if (bgp_peers[i].state == Established)
3897 bgp_stop(&bgp_peers[i]);
3898
3899 stopped_bgp = time_now;
3900
3901 if (!config->cluster_iam_master)
3902 {
3903 // we don't want to become master
3904 cluster_send_ping(0);
3905
3906 return 1;
3907 }
3908 }
3909
3910 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3911 return 1;
3912 }
3913 #endif /* BGP */
3914
3915 if (!config->cluster_iam_master)
3916 return 0;
3917
3918 if (main_quit == QUIT_SHUTDOWN)
3919 {
3920 static int dropped = 0;
3921 if (!dropped)
3922 {
3923 int i;
3924
3925 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3926 for (i = 1; i < MAXTUNNEL; i++)
3927 if (tunnel[i].ip || tunnel[i].state)
3928 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3929
3930 dropped = 1;
3931 }
3932 }
3933
3934 if (start_busy_wait == 0)
3935 start_busy_wait = TIME;
3936
3937 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3938 {
3939 if (!tunnel[i].controlc)
3940 continue;
3941
3942 if (last_talked != TIME)
3943 {
3944 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3945 last_talked = TIME;
3946 }
3947 return 1;
3948 }
3949
3950 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3951 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3952 {
3953 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3954 return 0;
3955 }
3956
3957 for (i = 1; i < MAXRADIUS; i++)
3958 {
3959 if (radius[i].state == RADIUSNULL)
3960 continue;
3961 if (radius[i].state == RADIUSWAIT)
3962 continue;
3963
3964 if (last_talked != TIME)
3965 {
3966 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3967 last_talked = TIME;
3968 }
3969 return 1;
3970 }
3971
3972 return 0;
3973 }
3974
3975 #ifdef HAVE_EPOLL
3976 # include <sys/epoll.h>
3977 #else
3978 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3979 # include "fake_epoll.h"
3980 #endif
3981
3982 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
3983 #define BASE_FDS (9 + MAX_UDPFD)
3984
3985 // additional polled fds
3986 #ifdef BGP
3987 # define EXTRA_FDS BGP_NUM_PEERS
3988 #else
3989 # define EXTRA_FDS 0
3990 #endif
3991
3992 // main loop - gets packets on tun or udp and processes them
3993 static void mainloop(void)
3994 {
3995 int i, j;
3996 uint8_t buf[65536];
3997 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3998 // and the forwarded pppoe session
3999 int size_bufp = sizeof(buf) - 32;
4000 clockt next_cluster_ping = 0; // send initial ping immediately
4001 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4002 int maxevent = sizeof(events)/sizeof(*events);
4003
4004 if ((epollfd = epoll_create(maxevent)) < 0)
4005 {
4006 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4007 exit(1);
4008 }
4009
4010 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",
4011 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4012
4013 /* setup our fds to poll for input */
4014 {
4015 static struct event_data d[BASE_FDS];
4016 struct epoll_event e;
4017
4018 e.events = EPOLLIN;
4019 i = 0;
4020
4021 if (clifd >= 0)
4022 {
4023 d[i].type = FD_TYPE_CLI;
4024 e.data.ptr = &d[i++];
4025 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4026 }
4027
4028 d[i].type = FD_TYPE_CLUSTER;
4029 e.data.ptr = &d[i++];
4030 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4031
4032 d[i].type = FD_TYPE_TUN;
4033 e.data.ptr = &d[i++];
4034 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4035
4036 d[i].type = FD_TYPE_CONTROL;
4037 e.data.ptr = &d[i++];
4038 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4039
4040 d[i].type = FD_TYPE_DAE;
4041 e.data.ptr = &d[i++];
4042 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4043
4044 d[i].type = FD_TYPE_NETLINK;
4045 e.data.ptr = &d[i++];
4046 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4047
4048 d[i].type = FD_TYPE_PPPOEDISC;
4049 e.data.ptr = &d[i++];
4050 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4051
4052 d[i].type = FD_TYPE_PPPOESESS;
4053 e.data.ptr = &d[i++];
4054 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4055
4056 for (j = 0; j < config->nbudpfd; j++)
4057 {
4058 d[i].type = FD_TYPE_UDP;
4059 d[i].index = j;
4060 e.data.ptr = &d[i++];
4061 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4062 }
4063 }
4064
4065 #ifdef BGP
4066 signal(SIGPIPE, SIG_IGN);
4067 bgp_setup(config->as_number);
4068 if (config->bind_address)
4069 bgp_add_route(config->bind_address, 0xffffffff);
4070
4071 for (i = 0; i < BGP_NUM_PEERS; i++)
4072 {
4073 if (config->neighbour[i].name[0])
4074 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4075 config->neighbour[i].as, config->neighbour[i].keepalive,
4076 config->neighbour[i].hold, config->neighbour[i].update_source,
4077 0); /* 0 = routing disabled */
4078 }
4079 #endif /* BGP */
4080
4081 while (!main_quit || still_busy())
4082 {
4083 int more = 0;
4084 int n;
4085
4086
4087 if (main_reload)
4088 {
4089 main_reload = 0;
4090 read_config_file();
4091 config->reload_config++;
4092 }
4093
4094 if (config->reload_config)
4095 {
4096 config->reload_config = 0;
4097 update_config();
4098 }
4099
4100 #ifdef BGP
4101 bgp_set_poll();
4102 #endif /* BGP */
4103
4104 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4105 STAT(select_called);
4106
4107 TIME = now(NULL);
4108 if (n < 0)
4109 {
4110 if (errno == EINTR ||
4111 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4112 continue;
4113
4114 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4115 break; // exit
4116 }
4117
4118 if (n)
4119 {
4120 struct sockaddr_in addr;
4121 struct in_addr local;
4122 socklen_t alen;
4123 int c, s;
4124 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4125 int pppoesess_ready = 0;
4126 int pppoesess_pkts = 0;
4127 int tun_ready = 0;
4128 int cluster_ready = 0;
4129 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4130 int tun_pkts = 0;
4131 int cluster_pkts = 0;
4132 #ifdef BGP
4133 uint32_t bgp_events[BGP_NUM_PEERS];
4134 memset(bgp_events, 0, sizeof(bgp_events));
4135 #endif /* BGP */
4136
4137 for (c = n, i = 0; i < c; i++)
4138 {
4139 struct event_data *d = events[i].data.ptr;
4140
4141 switch (d->type)
4142 {
4143 case FD_TYPE_CLI: // CLI connections
4144 {
4145 int cli;
4146
4147 alen = sizeof(addr);
4148 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4149 {
4150 cli_do(cli);
4151 close(cli);
4152 }
4153 else
4154 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4155
4156 n--;
4157 break;
4158 }
4159
4160 // these are handled below, with multiple interleaved reads
4161 case FD_TYPE_CLUSTER: cluster_ready++; break;
4162 case FD_TYPE_TUN: tun_ready++; break;
4163 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4164 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4165
4166 case FD_TYPE_PPPOEDISC: // pppoe discovery
4167 s = read(pppoediscfd, p, size_bufp);
4168 if (s > 0) process_pppoe_disc(p, s);
4169 n--;
4170 break;
4171
4172 case FD_TYPE_CONTROL: // nsctl commands
4173 alen = sizeof(addr);
4174 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4175 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4176 n--;
4177 break;
4178
4179 case FD_TYPE_DAE: // DAE requests
4180 alen = sizeof(addr);
4181 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4182 if (s > 0) processdae(p, s, &addr, alen, &local);
4183 n--;
4184 break;
4185
4186 case FD_TYPE_RADIUS: // RADIUS response
4187 alen = sizeof(addr);
4188 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4189 if (s >= 0 && config->cluster_iam_master)
4190 {
4191 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4192 addr.sin_addr.s_addr == config->radiusserver[1])
4193 processrad(p, s, d->index);
4194 else
4195 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4196 fmtaddr(addr.sin_addr.s_addr, 0));
4197 }
4198
4199 n--;
4200 break;
4201
4202 #ifdef BGP
4203 case FD_TYPE_BGP:
4204 bgp_events[d->index] = events[i].events;
4205 n--;
4206 break;
4207 #endif /* BGP */
4208
4209 case FD_TYPE_NETLINK:
4210 {
4211 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4212 s = netlink_recv(p, size_bufp);
4213 if (nh->nlmsg_type == NLMSG_ERROR)
4214 {
4215 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4216 if (errmsg->error)
4217 {
4218 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4219 {
4220 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4221 exit(1);
4222 }
4223 else
4224 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4225 }
4226 // else it's a ack
4227 }
4228 else
4229 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);
4230 n--;
4231 break;
4232 }
4233
4234 default:
4235 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4236 }
4237 }
4238
4239 #ifdef BGP
4240 bgp_process(bgp_events);
4241 #endif /* BGP */
4242
4243 for (c = 0; n && c < config->multi_read_count; c++)
4244 {
4245 for (j = 0; j < config->nbudpfd; j++)
4246 {
4247 // L2TP and L2TP REMOTE LNS
4248 if (udp_ready[j])
4249 {
4250 alen = sizeof(addr);
4251 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4252 {
4253 processudp(p, s, &addr, j);
4254 udp_pkts[j]++;
4255 }
4256 else
4257 {
4258 udp_ready[j] = 0;
4259 n--;
4260 }
4261 }
4262 }
4263
4264 // incoming IP
4265 if (tun_ready)
4266 {
4267 if ((s = read(tunfd, p, size_bufp)) > 0)
4268 {
4269 processtun(p, s);
4270 tun_pkts++;
4271 }
4272 else
4273 {
4274 tun_ready = 0;
4275 n--;
4276 }
4277 }
4278
4279 // pppoe session
4280 if (pppoesess_ready)
4281 {
4282 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4283 {
4284 process_pppoe_sess(p, s);
4285 pppoesess_pkts++;
4286 }
4287 else
4288 {
4289 pppoesess_ready = 0;
4290 n--;
4291 }
4292 }
4293
4294 // cluster
4295 if (cluster_ready)
4296 {
4297 alen = sizeof(addr);
4298 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4299 {
4300 processcluster(p, s, addr.sin_addr.s_addr);
4301 cluster_pkts++;
4302 }
4303 else
4304 {
4305 cluster_ready = 0;
4306 n--;
4307 }
4308 }
4309 }
4310
4311 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4312 STAT(multi_read_used);
4313
4314 if (c >= config->multi_read_count)
4315 {
4316 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4317 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4318 STAT(multi_read_exceeded);
4319 more++;
4320 }
4321 }
4322 #ifdef BGP
4323 else
4324 /* no event received, but timers could still have expired */
4325 bgp_process_peers_timers();
4326 #endif /* BGP */
4327
4328 if (time_changed)
4329 {
4330 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4331
4332 // Log current traffic stats
4333 snprintf(config->bandwidth, sizeof(config->bandwidth),
4334 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4335 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4336 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4337 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4338
4339 udp_tx = udp_rx = 0;
4340 udp_rx_pkt = eth_rx_pkt = 0;
4341 eth_tx = eth_rx = 0;
4342 time_changed = 0;
4343
4344 if (config->dump_speed)
4345 printf("%s\n", config->bandwidth);
4346
4347 // Update the internal time counter
4348 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4349
4350 {
4351 // Run timer hooks
4352 struct param_timer p = { time_now };
4353 run_plugins(PLUGIN_TIMER, &p);
4354 }
4355 }
4356
4357 // Runs on every machine (master and slaves).
4358 if (next_cluster_ping <= TIME)
4359 {
4360 // Check to see which of the cluster is still alive..
4361
4362 cluster_send_ping(basetime); // Only does anything if we're a slave
4363 cluster_check_master(); // ditto.
4364
4365 cluster_heartbeat(); // Only does anything if we're a master.
4366 cluster_check_slaves(); // ditto.
4367
4368 master_update_counts(); // If we're a slave, send our byte counters to our master.
4369
4370 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4371 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4372 else
4373 next_cluster_ping = TIME + config->cluster_hb_interval;
4374 }
4375
4376 if (!config->cluster_iam_master)
4377 continue;
4378
4379 // Run token bucket filtering queue..
4380 // Only run it every 1/10th of a second.
4381 {
4382 static clockt last_run = 0;
4383 if (last_run != TIME)
4384 {
4385 last_run = TIME;
4386 tbf_run_timer();
4387 }
4388 }
4389
4390 // Handle timeouts, retries etc.
4391 {
4392 static double last_clean = 0;
4393 double this_clean;
4394 double diff;
4395
4396 TIME = now(&this_clean);
4397 diff = this_clean - last_clean;
4398
4399 // Run during idle time (after we've handled
4400 // all incoming packets) or every 1/10th sec
4401 if (!more || diff > 0.1)
4402 {
4403 regular_cleanups(diff);
4404 last_clean = this_clean;
4405 }
4406 }
4407
4408 if (*config->accounting_dir)
4409 {
4410 static clockt next_acct = 0;
4411 static clockt next_shut_acct = 0;
4412
4413 if (next_acct <= TIME)
4414 {
4415 // Dump accounting data
4416 next_acct = TIME + ACCT_TIME;
4417 next_shut_acct = TIME + ACCT_SHUT_TIME;
4418 dump_acct_info(1);
4419 }
4420 else if (next_shut_acct <= TIME)
4421 {
4422 // Dump accounting data for shutdown sessions
4423 next_shut_acct = TIME + ACCT_SHUT_TIME;
4424 if (shut_acct_n)
4425 dump_acct_info(0);
4426 }
4427 }
4428 }
4429
4430 // Are we the master and shutting down??
4431 if (config->cluster_iam_master)
4432 cluster_heartbeat(); // Flush any queued changes..
4433
4434 // Ok. Notify everyone we're shutting down. If we're
4435 // the master, this will force an election.
4436 cluster_send_ping(0);
4437
4438 //
4439 // Important!!! We MUST not process any packets past this point!
4440 LOG(1, 0, 0, "Shutdown complete\n");
4441 }
4442
4443 static void stripdomain(char *host)
4444 {
4445 char *p;
4446
4447 if ((p = strchr(host, '.')))
4448 {
4449 char *domain = 0;
4450 char _domain[1024];
4451
4452 // strip off domain
4453 FILE *resolv = fopen("/etc/resolv.conf", "r");
4454 if (resolv)
4455 {
4456 char buf[1024];
4457 char *b;
4458
4459 while (fgets(buf, sizeof(buf), resolv))
4460 {
4461 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4462 continue;
4463
4464 if (!isspace(buf[6]))
4465 continue;
4466
4467 b = buf + 7;
4468 while (isspace(*b)) b++;
4469
4470 if (*b)
4471 {
4472 char *d = b;
4473 while (*b && !isspace(*b)) b++;
4474 *b = 0;
4475 if (buf[0] == 'd') // domain is canonical
4476 {
4477 domain = d;
4478 break;
4479 }
4480
4481 // first search line
4482 if (!domain)
4483 {
4484 // hold, may be subsequent domain line
4485 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4486 domain = _domain;
4487 }
4488 }
4489 }
4490
4491 fclose(resolv);
4492 }
4493
4494 if (domain)
4495 {
4496 int hl = strlen(host);
4497 int dl = strlen(domain);
4498 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4499 host[hl -dl - 1] = 0;
4500 }
4501 else
4502 {
4503 *p = 0; // everything after first dot
4504 }
4505 }
4506 }
4507
4508 // Init data structures
4509 static void initdata(int optdebug, char *optconfig)
4510 {
4511 int i;
4512
4513 if (!(config = shared_malloc(sizeof(configt))))
4514 {
4515 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4516 exit(1);
4517 }
4518
4519 memset(config, 0, sizeof(configt));
4520 time(&config->start_time);
4521 strncpy(config->config_file, optconfig, strlen(optconfig));
4522 config->debug = optdebug;
4523 config->num_tbfs = MAXTBFS;
4524 config->rl_rate = 28; // 28kbps
4525 config->cluster_mcast_ttl = 1;
4526 config->cluster_master_min_adv = 1;
4527 config->ppp_restart_time = 3;
4528 config->ppp_max_configure = 10;
4529 config->ppp_max_failure = 5;
4530 config->kill_timedout_sessions = 1;
4531 strcpy(config->random_device, RANDOMDEVICE);
4532 // Set default value echo_timeout and idle_echo_timeout
4533 config->echo_timeout = ECHO_TIMEOUT;
4534 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4535
4536 log_stream = stderr;
4537
4538 #ifdef RINGBUFFER
4539 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4540 {
4541 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4542 exit(1);
4543 }
4544 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4545 #endif
4546
4547 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4548 {
4549 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4550 exit(1);
4551 }
4552 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4553 {
4554 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4555 exit(1);
4556 }
4557 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4558 {
4559 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4560 exit(1);
4561 }
4562 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4563 {
4564 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4565 exit(1);
4566 }
4567 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4568 {
4569 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4570 exit(1);
4571 }
4572
4573 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4574 {
4575 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4576 exit(1);
4577 }
4578
4579 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4580 {
4581 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4582 exit(1);
4583 }
4584
4585 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4586 {
4587 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4588 exit(1);
4589 }
4590
4591 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4592 {
4593 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4594 exit(1);
4595 }
4596 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4597
4598 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4599 {
4600 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4601 exit(1);
4602 }
4603 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4604
4605 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4606 {
4607 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4608 exit(1);
4609 }
4610 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4611
4612 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4613 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4614 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4615 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4616 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4617
4618 // Put all the sessions on the free list marked as undefined.
4619 for (i = 1; i < MAXSESSION; i++)
4620 {
4621 session[i].next = i + 1;
4622 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4623 }
4624 session[MAXSESSION - 1].next = 0;
4625 sessionfree = 1;
4626
4627 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4628 for (i = 1; i < MAXTUNNEL; i++)
4629 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4630
4631 for (i = 1; i < MAXBUNDLE; i++) {
4632 bundle[i].state = BUNDLEUNDEF;
4633 }
4634
4635 if (!*hostname)
4636 {
4637 // Grab my hostname unless it's been specified
4638 gethostname(hostname, sizeof(hostname));
4639 stripdomain(hostname);
4640 }
4641
4642 _statistics->start_time = _statistics->last_reset = time(NULL);
4643
4644 #ifdef BGP
4645 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4646 {
4647 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4648 exit(1);
4649 }
4650 #endif /* BGP */
4651
4652 lac_initremotelnsdata();
4653 }
4654
4655 static int assign_ip_address(sessionidt s)
4656 {
4657 uint32_t i;
4658 int best = -1;
4659 time_t best_time = time_now;
4660 char *u = session[s].user;
4661 char reuse = 0;
4662
4663
4664 CSTAT(assign_ip_address);
4665
4666 for (i = 1; i < ip_pool_size; i++)
4667 {
4668 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4669 continue;
4670
4671 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4672 {
4673 best = i;
4674 reuse = 1;
4675 break;
4676 }
4677
4678 if (ip_address_pool[i].last < best_time)
4679 {
4680 best = i;
4681 if (!(best_time = ip_address_pool[i].last))
4682 break; // never used, grab this one
4683 }
4684 }
4685
4686 if (best < 0)
4687 {
4688 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4689 return 0;
4690 }
4691
4692 session[s].ip = ip_address_pool[best].address;
4693 session[s].ip_pool_index = best;
4694 ip_address_pool[best].assigned = 1;
4695 ip_address_pool[best].last = time_now;
4696 ip_address_pool[best].session = s;
4697 if (session[s].walled_garden)
4698 /* Don't track addresses of users in walled garden (note: this
4699 means that their address isn't "sticky" even if they get
4700 un-gardened). */
4701 ip_address_pool[best].user[0] = 0;
4702 else
4703 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4704
4705 STAT(ip_allocated);
4706 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4707 reuse ? "Reusing" : "Allocating", best);
4708
4709 return 1;
4710 }
4711
4712 static void free_ip_address(sessionidt s)
4713 {
4714 int i = session[s].ip_pool_index;
4715
4716
4717 CSTAT(free_ip_address);
4718
4719 if (!session[s].ip)
4720 return; // what the?
4721
4722 if (i < 0) // Is this actually part of the ip pool?
4723 i = 0;
4724
4725 STAT(ip_freed);
4726 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4727 session[s].ip = 0;
4728 ip_address_pool[i].assigned = 0;
4729 ip_address_pool[i].session = 0;
4730 ip_address_pool[i].last = time_now;
4731 }
4732
4733 //
4734 // Fsck the address pool against the session table.
4735 // Normally only called when we become a master.
4736 //
4737 // This isn't perfect: We aren't keep tracking of which
4738 // users used to have an IP address.
4739 //
4740 void rebuild_address_pool(void)
4741 {
4742 int i;
4743
4744 //
4745 // Zero the IP pool allocation, and build
4746 // a map from IP address to pool index.
4747 for (i = 1; i < MAXIPPOOL; ++i)
4748 {
4749 ip_address_pool[i].assigned = 0;
4750 ip_address_pool[i].session = 0;
4751 if (!ip_address_pool[i].address)
4752 continue;
4753
4754 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4755 }
4756
4757 for (i = 0; i < MAXSESSION; ++i)
4758 {
4759 int ipid;
4760 if (!(session[i].opened && session[i].ip))
4761 continue;
4762
4763 ipid = - lookup_ipmap(htonl(session[i].ip));
4764
4765 if (session[i].ip_pool_index < 0)
4766 {
4767 // Not allocated out of the pool.
4768 if (ipid < 1) // Not found in the pool either? good.
4769 continue;
4770
4771 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4772 i, fmtaddr(session[i].ip, 0), ipid);
4773
4774 // Fall through and process it as part of the pool.
4775 }
4776
4777
4778 if (ipid > MAXIPPOOL || ipid < 0)
4779 {
4780 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4781 ipid = -1;
4782 session[i].ip_pool_index = ipid;
4783 continue;
4784 }
4785
4786 ip_address_pool[ipid].assigned = 1;
4787 ip_address_pool[ipid].session = i;
4788 ip_address_pool[ipid].last = time_now;
4789 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4790 session[i].ip_pool_index = ipid;
4791 cache_ipmap(session[i].ip, i); // Fix the ip map.
4792 }
4793 }
4794
4795 //
4796 // Fix the address pool to match a changed session.
4797 // (usually when the master sends us an update).
4798 static void fix_address_pool(int sid)
4799 {
4800 int ipid;
4801
4802 ipid = session[sid].ip_pool_index;
4803
4804 if (ipid > ip_pool_size)
4805 return; // Ignore it. rebuild_address_pool will fix it up.
4806
4807 if (ip_address_pool[ipid].address != session[sid].ip)
4808 return; // Just ignore it. rebuild_address_pool will take care of it.
4809
4810 ip_address_pool[ipid].assigned = 1;
4811 ip_address_pool[ipid].session = sid;
4812 ip_address_pool[ipid].last = time_now;
4813 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4814 }
4815
4816 //
4817 // Add a block of addresses to the IP pool to hand out.
4818 //
4819 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4820 {
4821 int i;
4822 if (prefixlen == 0)
4823 prefixlen = 32; // Host route only.
4824
4825 addr &= 0xffffffff << (32 - prefixlen);
4826
4827 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4828 return ;
4829
4830 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4831 {
4832 if ((i & 0xff) == 0 || (i&0xff) == 255)
4833 continue; // Skip 0 and broadcast addresses.
4834
4835 ip_address_pool[ip_pool_size].address = i;
4836 ip_address_pool[ip_pool_size].assigned = 0;
4837 ++ip_pool_size;
4838 if (ip_pool_size >= MAXIPPOOL)
4839 {
4840 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4841 return;
4842 }
4843 }
4844 }
4845
4846 // Initialize the IP address pool
4847 static void initippool()
4848 {
4849 FILE *f;
4850 char *p;
4851 char buf[4096];
4852 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4853
4854 if (!(f = fopen(IPPOOLFILE, "r")))
4855 {
4856 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4857 exit(1);
4858 }
4859
4860 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4861 {
4862 char *pool = buf;
4863 buf[4095] = 0; // Force it to be zero terminated/
4864
4865 if (*buf == '#' || *buf == '\n')
4866 continue; // Skip comments / blank lines
4867 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4868 if ((p = (char *)strchr(buf, ':')))
4869 {
4870 in_addr_t src;
4871 *p = '\0';
4872 src = inet_addr(buf);
4873 if (src == INADDR_NONE)
4874 {
4875 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4876 exit(1);
4877 }
4878 // This entry is for a specific IP only
4879 if (src != config->bind_address)
4880 continue;
4881 *p = ':';
4882 pool = p+1;
4883 }
4884 if ((p = (char *)strchr(pool, '/')))
4885 {
4886 // It's a range
4887 int numbits = 0;
4888 in_addr_t start = 0;
4889
4890 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4891 *p++ = 0;
4892 if (!*p || !(numbits = atoi(p)))
4893 {
4894 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4895 continue;
4896 }
4897 start = ntohl(inet_addr(pool));
4898
4899 // Add a static route for this pool
4900 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4901 fmtaddr(htonl(start), 0), numbits);
4902
4903 routeset(0, start, numbits, 0, 1);
4904
4905 add_to_ip_pool(start, numbits);
4906 }
4907 else
4908 {
4909 // It's a single ip address
4910 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4911 }
4912 }
4913 fclose(f);
4914 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4915 }
4916
4917 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4918 {
4919 struct sockaddr_in snoop_addr = {0};
4920 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4921 return;
4922
4923 snoop_addr.sin_family = AF_INET;
4924 snoop_addr.sin_addr.s_addr = destination;
4925 snoop_addr.sin_port = ntohs(port);
4926
4927 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4928 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4929 htons(snoop_addr.sin_port));
4930
4931 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4932 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4933
4934 STAT(packets_snooped);
4935 }
4936
4937 static int dump_session(FILE **f, sessiont *s)
4938 {
4939 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4940 return 1;
4941
4942 if (!*f)
4943 {
4944 char filename[1024];
4945 char timestr[64];
4946 time_t now = time(NULL);
4947
4948 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4949 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4950
4951 if (!(*f = fopen(filename, "w")))
4952 {
4953 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4954 return 0;
4955 }
4956
4957 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4958 if(config->account_all_origin)
4959 {
4960 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4961 "# host: %s\n"
4962 "# endpoint: %s\n"
4963 "# time: %ld\n"
4964 "# uptime: %ld\n"
4965 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
4966 hostname,
4967 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4968 now,
4969 now - basetime);
4970 }
4971 else
4972 {
4973 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4974 "# host: %s\n"
4975 "# endpoint: %s\n"
4976 "# time: %ld\n"
4977 "# uptime: %ld\n"
4978 "# format: username ip qos uptxoctets downrxoctets\n",
4979 hostname,
4980 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
4981 now,
4982 now - basetime);
4983 }
4984 }
4985
4986 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4987 if(config->account_all_origin)
4988 {
4989 fprintf(*f, "%s %s %d %u %u %s\n",
4990 s->user, // username
4991 fmtaddr(htonl(s->ip), 0), // ip
4992 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4993 (uint32_t) s->cin_delta, // uptxoctets
4994 (uint32_t) s->cout_delta, // downrxoctets
4995 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
4996 }
4997 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
4998 {
4999 fprintf(*f, "%s %s %d %u %u\n",
5000 s->user, // username
5001 fmtaddr(htonl(s->ip), 0), // ip
5002 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5003 (uint32_t) s->cin_delta, // uptxoctets
5004 (uint32_t) s->cout_delta); // downrxoctets
5005 }
5006
5007 s->cin_delta = s->cout_delta = 0;
5008
5009 return 1;
5010 }
5011
5012 static void dump_acct_info(int all)
5013 {
5014 int i;
5015 FILE *f = NULL;
5016
5017
5018 CSTAT(dump_acct_info);
5019
5020 if (shut_acct_n)
5021 {
5022 for (i = 0; i < shut_acct_n; i++)
5023 dump_session(&f, &shut_acct[i]);
5024
5025 shut_acct_n = 0;
5026 }
5027
5028 if (all)
5029 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5030 dump_session(&f, &session[i]);
5031
5032 if (f)
5033 fclose(f);
5034 }
5035
5036 // Main program
5037 int main(int argc, char *argv[])
5038 {
5039 int i;
5040 int optdebug = 0;
5041 char *optconfig = CONFIGFILE;
5042
5043 time(&basetime); // start clock
5044
5045 // scan args
5046 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5047 {
5048 switch (i)
5049 {
5050 case 'd':
5051 if (fork()) exit(0);
5052 setsid();
5053 if(!freopen("/dev/null", "r", stdin)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno));
5054 if(!freopen("/dev/null", "w", stdout)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno));
5055 if(!freopen("/dev/null", "w", stderr)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno));
5056 break;
5057 case 'v':
5058 optdebug++;
5059 break;
5060 case 'c':
5061 optconfig = optarg;
5062 break;
5063 case 'h':
5064 snprintf(hostname, sizeof(hostname), "%s", optarg);
5065 break;
5066 default:
5067 printf("Args are:\n"
5068 "\t-d\t\tDetach from terminal\n"
5069 "\t-c <file>\tConfig file\n"
5070 "\t-h <hostname>\tForce hostname\n"
5071 "\t-v\t\tDebug\n");
5072
5073 return (0);
5074 break;
5075 }
5076 }
5077
5078 // Start the timer routine off
5079 time(&time_now);
5080 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5081
5082 initplugins();
5083 initdata(optdebug, optconfig);
5084
5085 init_cli();
5086 read_config_file();
5087 /* set hostname /after/ having read the config file */
5088 if (*config->hostname)
5089 strcpy(hostname, config->hostname);
5090 cli_init_complete(hostname);
5091 update_config();
5092 init_tbf(config->num_tbfs);
5093
5094 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5095 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5096 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5097 {
5098 struct rlimit rlim;
5099 rlim.rlim_cur = RLIM_INFINITY;
5100 rlim.rlim_max = RLIM_INFINITY;
5101 // Remove the maximum core size
5102 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5103 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5104
5105 // Make core dumps go to /tmp
5106 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno));
5107 }
5108
5109 if (config->scheduler_fifo)
5110 {
5111 int ret;
5112 struct sched_param params = {0};
5113 params.sched_priority = 1;
5114
5115 if (get_nprocs() < 2)
5116 {
5117 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5118 config->scheduler_fifo = 0;
5119 }
5120 else
5121 {
5122 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5123 {
5124 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5125 }
5126 else
5127 {
5128 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5129 config->scheduler_fifo = 0;
5130 }
5131 }
5132 }
5133
5134 initnetlink();
5135
5136 /* Set up the cluster communications port. */
5137 if (cluster_init() < 0)
5138 exit(1);
5139
5140 inittun();
5141 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5142
5143 if (*config->pppoe_if_to_bind)
5144 {
5145 init_pppoe();
5146 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5147 }
5148
5149 if (!config->nbmultiaddress)
5150 {
5151 config->bind_n_address[0] = config->bind_address;
5152 config->nbmultiaddress++;
5153 }
5154 config->nbudpfd = config->nbmultiaddress;
5155 for (i = 0; i < config->nbudpfd; i++)
5156 initudp(&udpfd[i], config->bind_n_address[i]);
5157 initlacudp();
5158 config->indexlacudpfd = config->nbudpfd;
5159 udpfd[config->indexlacudpfd] = udplacfd;
5160 config->nbudpfd++;
5161
5162 initcontrol();
5163 initdae();
5164
5165 // Intercept
5166 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5167
5168 initrad();
5169 initippool();
5170
5171 // seed prng
5172 {
5173 unsigned seed = time_now ^ getpid();
5174 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5175 srand(seed);
5176 }
5177
5178 signal(SIGHUP, sighup_handler);
5179 signal(SIGCHLD, sigchild_handler);
5180 signal(SIGTERM, shutdown_handler);
5181 signal(SIGINT, shutdown_handler);
5182 signal(SIGQUIT, shutdown_handler);
5183
5184 // Prevent us from getting paged out
5185 if (config->lock_pages)
5186 {
5187 if (!mlockall(MCL_CURRENT))
5188 LOG(1, 0, 0, "Locking pages into memory\n");
5189 else
5190 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5191 }
5192
5193 mainloop();
5194
5195 /* remove plugins (so cleanup code gets run) */
5196 plugins_done();
5197
5198 // Remove the PID file if we wrote it
5199 if (config->wrote_pid && *config->pid_file == '/')
5200 unlink(config->pid_file);
5201
5202 /* kill CLI children */
5203 signal(SIGTERM, SIG_IGN);
5204 kill(0, SIGTERM);
5205 return 0;
5206 }
5207
5208 static void sighup_handler(int sig)
5209 {
5210 main_reload++;
5211 }
5212
5213 static void shutdown_handler(int sig)
5214 {
5215 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5216 }
5217
5218 static void sigchild_handler(int sig)
5219 {
5220 while (waitpid(-1, NULL, WNOHANG) > 0)
5221 ;
5222 }
5223
5224 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5225 {
5226 MD5_CTX ctx;
5227 *challenge_response = NULL;
5228
5229 if (!*config->l2tp_secret)
5230 {
5231 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5232 return;
5233 }
5234
5235 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5236
5237 *challenge_response = calloc(17, 1);
5238
5239 MD5_Init(&ctx);
5240 MD5_Update(&ctx, &id, 1);
5241 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5242 MD5_Update(&ctx, challenge, challenge_length);
5243 MD5_Final(*challenge_response, &ctx);
5244
5245 return;
5246 }
5247
5248 static int facility_value(char *name)
5249 {
5250 int i;
5251 for (i = 0; facilitynames[i].c_name; i++)
5252 {
5253 if (strcmp(facilitynames[i].c_name, name) == 0)
5254 return facilitynames[i].c_val;
5255 }
5256 return 0;
5257 }
5258
5259 static void update_config()
5260 {
5261 int i;
5262 char *p;
5263 static int timeout = 0;
5264 static int interval = 0;
5265
5266 // Update logging
5267 closelog();
5268 syslog_log = 0;
5269 if (log_stream)
5270 {
5271 if (log_stream != stderr)
5272 fclose(log_stream);
5273
5274 log_stream = NULL;
5275 }
5276
5277 if (*config->log_filename)
5278 {
5279 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5280 {
5281 char *p = config->log_filename + 7;
5282 if (*p)
5283 {
5284 openlog("l2tpns", LOG_PID, facility_value(p));
5285 syslog_log = 1;
5286 }
5287 }
5288 else if (strchr(config->log_filename, '/') == config->log_filename)
5289 {
5290 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5291 {
5292 fseek(log_stream, 0, SEEK_END);
5293 setbuf(log_stream, NULL);
5294 }
5295 else
5296 {
5297 log_stream = stderr;
5298 setbuf(log_stream, NULL);
5299 }
5300 }
5301 }
5302 else
5303 {
5304 log_stream = stderr;
5305 setbuf(log_stream, NULL);
5306 }
5307
5308 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5309 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5310
5311 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5312 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5313 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5314
5315 // reset MRU/MSS globals
5316 MRU = config->l2tp_mtu - L2TP_HDRS;
5317 if (MRU > PPPoE_MRU)
5318 MRU = PPPoE_MRU;
5319
5320 MSS = MRU - TCP_HDRS;
5321
5322 // Update radius
5323 config->numradiusservers = 0;
5324 for (i = 0; i < MAXRADSERVER; i++)
5325 if (config->radiusserver[i])
5326 {
5327 config->numradiusservers++;
5328 // Set radius port: if not set, take the port from the
5329 // first radius server. For the first radius server,
5330 // take the #defined default value from l2tpns.h
5331
5332 // test twice, In case someone works with
5333 // a secondary radius server without defining
5334 // a primary one, this will work even then.
5335 if (i > 0 && !config->radiusport[i])
5336 config->radiusport[i] = config->radiusport[i-1];
5337 if (!config->radiusport[i])
5338 config->radiusport[i] = RADPORT;
5339 }
5340
5341 if (!config->numradiusservers)
5342 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5343
5344 // parse radius_authtypes_s
5345 config->radius_authtypes = config->radius_authprefer = 0;
5346 p = config->radius_authtypes_s;
5347 while (p && *p)
5348 {
5349 char *s = strpbrk(p, " \t,");
5350 int type = 0;
5351
5352 if (s)
5353 {
5354 *s++ = 0;
5355 while (*s == ' ' || *s == '\t')
5356 s++;
5357
5358 if (!*s)
5359 s = 0;
5360 }
5361
5362 if (!strncasecmp("chap", p, strlen(p)))
5363 type = AUTHCHAP;
5364 else if (!strncasecmp("pap", p, strlen(p)))
5365 type = AUTHPAP;
5366 else
5367 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5368
5369 config->radius_authtypes |= type;
5370 if (!config->radius_authprefer)
5371 config->radius_authprefer = type;
5372
5373 p = s;
5374 }
5375
5376 if (!config->radius_authtypes)
5377 {
5378 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5379 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5380 }
5381
5382 // normalise radius_authtypes_s
5383 if (config->radius_authprefer == AUTHPAP)
5384 {
5385 strcpy(config->radius_authtypes_s, "pap");
5386 if (config->radius_authtypes & AUTHCHAP)
5387 strcat(config->radius_authtypes_s, ", chap");
5388 }
5389 else
5390 {
5391 strcpy(config->radius_authtypes_s, "chap");
5392 if (config->radius_authtypes & AUTHPAP)
5393 strcat(config->radius_authtypes_s, ", pap");
5394 }
5395
5396 if (!config->radius_dae_port)
5397 config->radius_dae_port = DAEPORT;
5398
5399 if(!config->bind_portremotelns)
5400 config->bind_portremotelns = L2TPLACPORT;
5401 if(!config->bind_address_remotelns)
5402 config->bind_address_remotelns = INADDR_ANY;
5403
5404 if (*config->bind_multi_address)
5405 {
5406 char *sip = config->bind_multi_address;
5407 char *n = sip;
5408 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5409 config->nbmultiaddress = 0;
5410
5411 while (*sip && (sip < e))
5412 {
5413 in_addr_t ip = 0;
5414 uint8_t u = 0;
5415
5416 while (n < e && (*n == ',' || *n == ' ')) n++;
5417
5418 while (n < e && (isdigit(*n) || *n == '.'))
5419 {
5420 if (*n == '.')
5421 {
5422 ip = (ip << 8) + u;
5423 u = 0;
5424 }
5425 else
5426 u = u * 10 + *n - '0';
5427 n++;
5428 }
5429 ip = (ip << 8) + u;
5430 n++;
5431
5432 if (ip)
5433 {
5434 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5435 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5436 config->nbmultiaddress++;
5437 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5438
5439 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5440 }
5441
5442 sip = n;
5443 }
5444
5445 if (config->nbmultiaddress >= 1)
5446 {
5447 config->bind_address = config->bind_n_address[0];
5448 config->iftun_address = config->bind_address;
5449 }
5450 }
5451
5452 if(!config->iftun_address)
5453 {
5454 config->iftun_address = config->bind_address;
5455 config->iftun_n_address[0] = config->iftun_address;
5456 }
5457
5458 if (*config->multi_hostname)
5459 {
5460 char *shost = config->multi_hostname;
5461 char *n = shost;
5462 char *e = config->multi_hostname + strlen(config->multi_hostname);
5463 config->nbmultihostname = 0;
5464
5465 while (*shost && (shost < e))
5466 {
5467 while ((n < e) && (*n == ' ' || *n == ',' || *n == '\t')) n++;
5468
5469 i = 0;
5470 while (n < e && (*n != ',') && (*n != '\t'))
5471 {
5472 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5473 n++;i++;
5474 }
5475
5476 if (i > 0)
5477 {
5478 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5479 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5480 config->nbmultihostname++;
5481 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5482 }
5483
5484 shost = n;
5485 }
5486
5487 if (config->nbmultihostname >= 1)
5488 {
5489 strcpy(hostname, config->multi_n_hostname[0]);
5490 strcpy(config->hostname, hostname);
5491 }
5492 }
5493
5494 if (!*config->pppoe_ac_name)
5495 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5496
5497 // re-initialise the random number source
5498 initrandom(config->random_device);
5499
5500 // Update plugins
5501 for (i = 0; i < MAXPLUGINS; i++)
5502 {
5503 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5504 continue;
5505
5506 if (*config->plugins[i])
5507 {
5508 // Plugin added
5509 add_plugin(config->plugins[i]);
5510 }
5511 else if (*config->old_plugins[i])
5512 {
5513 // Plugin removed
5514 remove_plugin(config->old_plugins[i]);
5515 }
5516 }
5517
5518 // Guest change
5519 guest_accounts_num = 0;
5520 char *p2 = config->guest_user;
5521 while (p2 && *p2)
5522 {
5523 char *s = strpbrk(p2, " \t,");
5524 if (s)
5525 {
5526 *s++ = 0;
5527 while (*s == ' ' || *s == '\t')
5528 s++;
5529
5530 if (!*s)
5531 s = 0;
5532 }
5533
5534 strcpy(guest_users[guest_accounts_num], p2);
5535 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5536 guest_accounts_num++;
5537 p2 = s;
5538 }
5539 // Rebuild the guest_user array
5540 strcpy(config->guest_user, "");
5541 int ui = 0;
5542 for (ui=0; ui<guest_accounts_num; ui++)
5543 {
5544 strcat(config->guest_user, guest_users[ui]);
5545 if (ui<guest_accounts_num-1)
5546 {
5547 strcat(config->guest_user, ",");
5548 }
5549 }
5550
5551
5552 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5553 if (!config->multi_read_count) config->multi_read_count = 10;
5554 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5555 if (!*config->cluster_interface)
5556 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5557
5558 if (!config->cluster_hb_interval)
5559 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5560
5561 if (!config->cluster_hb_timeout)
5562 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5563
5564 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5565 {
5566 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5567 // late, ensure we're sufficiently larger than that
5568 int t = 4 * config->cluster_hb_interval + 11;
5569
5570 if (config->cluster_hb_timeout < t)
5571 {
5572 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5573 config->cluster_hb_timeout = t;
5574 }
5575
5576 // Push timing changes to the slaves immediately if we're the master
5577 if (config->cluster_iam_master)
5578 cluster_heartbeat();
5579
5580 interval = config->cluster_hb_interval;
5581 timeout = config->cluster_hb_timeout;
5582 }
5583
5584 // Write PID file
5585 if (*config->pid_file == '/' && !config->wrote_pid)
5586 {
5587 FILE *f;
5588 if ((f = fopen(config->pid_file, "w")))
5589 {
5590 fprintf(f, "%d\n", getpid());
5591 fclose(f);
5592 config->wrote_pid = 1;
5593 }
5594 else
5595 {
5596 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5597 }
5598 }
5599 }
5600
5601 static void read_config_file()
5602 {
5603 FILE *f;
5604
5605 if (!config->config_file) return;
5606 if (!(f = fopen(config->config_file, "r")))
5607 {
5608 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5609 return;
5610 }
5611
5612 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5613 cli_do_file(f);
5614 LOG(3, 0, 0, "Done reading config file\n");
5615 fclose(f);
5616 }
5617
5618 int sessionsetup(sessionidt s, tunnelidt t)
5619 {
5620 // A session now exists, set it up
5621 in_addr_t ip;
5622 char *user;
5623 sessionidt i;
5624 int r;
5625
5626 CSTAT(sessionsetup);
5627
5628 LOG(3, s, t, "Doing session setup for session\n");
5629
5630 // Join a bundle if the MRRU option is accepted
5631 if(session[s].mrru > 0 && session[s].bundle == 0)
5632 {
5633 LOG(3, s, t, "This session can be part of multilink bundle\n");
5634 if (join_bundle(s) > 0)
5635 cluster_send_bundle(session[s].bundle);
5636 else
5637 {
5638 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5639 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5640 return 0;
5641 }
5642 }
5643
5644 if (!session[s].ip)
5645 {
5646 assign_ip_address(s);
5647 if (!session[s].ip)
5648 {
5649 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5650 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5651 return 0;
5652 }
5653 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5654 fmtaddr(htonl(session[s].ip), 0));
5655 }
5656
5657 // Make sure this is right
5658 session[s].tunnel = t;
5659
5660 // zap old sessions with same IP and/or username
5661 // Don't kill gardened sessions - doing so leads to a DoS
5662 // from someone who doesn't need to know the password
5663 {
5664 ip = session[s].ip;
5665 user = session[s].user;
5666 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5667 {
5668 if (i == s) continue;
5669 if (!session[s].opened) break;
5670 // Allow duplicate sessions for multilink ones of the same bundle.
5671 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5672
5673 if (ip == session[i].ip)
5674 {
5675 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5676 continue;
5677 }
5678
5679 if (config->allow_duplicate_users) continue;
5680 if (session[s].walled_garden || session[i].walled_garden) continue;
5681 // Guest change
5682 int found = 0;
5683 int gu;
5684 for (gu = 0; gu < guest_accounts_num; gu++)
5685 {
5686 if (!strcasecmp(user, guest_users[gu]))
5687 {
5688 found = 1;
5689 break;
5690 }
5691 }
5692 if (found) continue;
5693
5694 // Drop the new session in case of duplicate sessionss, not the old one.
5695 if (!strcasecmp(user, session[i].user))
5696 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5697 }
5698 }
5699
5700 // no need to set a route for the same IP address of the bundle
5701 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5702 {
5703 int routed = 0;
5704
5705 // Add the route for this session.
5706 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5707 {
5708 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5709 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5710 routed++;
5711
5712 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5713 }
5714
5715 // Static IPs need to be routed if not already
5716 // convered by a Framed-Route. Anything else is part
5717 // of the IP address pool and is already routed, it
5718 // just needs to be added to the IP cache.
5719 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5720 if (session[s].ip_pool_index == -1) // static ip
5721 {
5722 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5723 }
5724 else
5725 cache_ipmap(session[s].ip, s);
5726 }
5727
5728 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5729 lcp_open(s, t); // transition to Network phase and send initial IPCP
5730
5731 // Run the plugin's against this new session.
5732 {
5733 struct param_new_session data = { &tunnel[t], &session[s] };
5734 run_plugins(PLUGIN_NEW_SESSION, &data);
5735 }
5736
5737 // Allocate TBFs if throttled
5738 if (session[s].throttle_in || session[s].throttle_out)
5739 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5740
5741 session[s].last_packet = session[s].last_data = time_now;
5742
5743 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5744 fmtaddr(htonl(session[s].ip), 0),
5745 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5746
5747 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5748
5749 return 1; // RADIUS OK and IP allocated, done...
5750 }
5751
5752 //
5753 // This session just got dropped on us by the master or something.
5754 // Make sure our tables up up to date...
5755 //
5756 int load_session(sessionidt s, sessiont *new)
5757 {
5758 int i;
5759 int newip = 0;
5760
5761 // Sanity checks.
5762 if (new->ip_pool_index >= MAXIPPOOL ||
5763 new->tunnel >= MAXTUNNEL)
5764 {
5765 LOG(0, s, 0, "Strange session update received!\n");
5766 // FIXME! What to do here?
5767 return 0;
5768 }
5769
5770 //
5771 // Ok. All sanity checks passed. Now we're committed to
5772 // loading the new session.
5773 //
5774
5775 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5776
5777 // See if routes/ip cache need updating
5778 if (new->ip != session[s].ip)
5779 newip++;
5780
5781 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5782 if (new->route[i].ip != session[s].route[i].ip ||
5783 new->route[i].prefixlen != session[s].route[i].prefixlen)
5784 newip++;
5785
5786 // needs update
5787 if (newip)
5788 {
5789 int routed = 0;
5790
5791 // remove old routes...
5792 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5793 {
5794 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5795 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5796 routed++;
5797
5798 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5799 }
5800
5801 // ...ip
5802 if (session[s].ip)
5803 {
5804 if (session[s].ip_pool_index == -1) // static IP
5805 {
5806 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5807 }
5808 else // It's part of the IP pool, remove it manually.
5809 uncache_ipmap(session[s].ip);
5810 }
5811
5812 routed = 0;
5813
5814 // add new routes...
5815 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5816 {
5817 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5818 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5819 routed++;
5820
5821 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5822 }
5823
5824 // ...ip
5825 if (new->ip)
5826 {
5827 // If there's a new one, add it.
5828 if (new->ip_pool_index == -1)
5829 {
5830 if (!routed) routeset(s, new->ip, 0, 0, 1);
5831 }
5832 else
5833 cache_ipmap(new->ip, s);
5834 }
5835 }
5836
5837 // check v6 routing
5838 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5839 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5840
5841 // check filters
5842 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5843 {
5844 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5845 new->filter_in = 0;
5846 }
5847
5848 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5849 {
5850 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5851 new->filter_out = 0;
5852 }
5853
5854 if (new->filter_in != session[s].filter_in)
5855 {
5856 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5857 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5858 }
5859
5860 if (new->filter_out != session[s].filter_out)
5861 {
5862 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5863 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5864 }
5865
5866 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5867 // for walking the sessions to forward byte counts to the master.
5868 config->cluster_highest_sessionid = s;
5869
5870 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5871
5872 // Do fixups into address pool.
5873 if (new->ip_pool_index != -1)
5874 fix_address_pool(s);
5875
5876 return 1;
5877 }
5878
5879 static void initplugins()
5880 {
5881 int i;
5882
5883 loaded_plugins = ll_init();
5884 // Initialize the plugins to nothing
5885 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5886 plugins[i] = ll_init();
5887 }
5888
5889 static void *open_plugin(char *plugin_name, int load)
5890 {
5891 char path[256] = "";
5892
5893 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5894 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5895 return dlopen(path, RTLD_NOW);
5896 }
5897
5898 // plugin callback to get a config value
5899 static void *getconfig(char *key, enum config_typet type)
5900 {
5901 int i;
5902
5903 for (i = 0; config_values[i].key; i++)
5904 {
5905 if (!strcmp(config_values[i].key, key))
5906 {
5907 if (config_values[i].type == type)
5908 return ((void *) config) + config_values[i].offset;
5909
5910 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5911 key, type, config_values[i].type);
5912
5913 return 0;
5914 }
5915 }
5916
5917 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5918 return 0;
5919 }
5920
5921 static int add_plugin(char *plugin_name)
5922 {
5923 static struct pluginfuncs funcs = {
5924 _log,
5925 _log_hex,
5926 fmtaddr,
5927 sessionbyuser,
5928 sessiontbysessionidt,
5929 sessionidtbysessiont,
5930 radiusnew,
5931 radiussend,
5932 getconfig,
5933 sessionshutdown,
5934 sessionkill,
5935 throttle_session,
5936 cluster_send_session,
5937 };
5938
5939 void *p = open_plugin(plugin_name, 1);
5940 int (*initfunc)(struct pluginfuncs *);
5941 int i;
5942
5943 if (!p)
5944 {
5945 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5946 return -1;
5947 }
5948
5949 if (ll_contains(loaded_plugins, p))
5950 {
5951 dlclose(p);
5952 return 0; // already loaded
5953 }
5954
5955 {
5956 int *v = dlsym(p, "plugin_api_version");
5957 if (!v || *v != PLUGIN_API_VERSION)
5958 {
5959 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5960 dlclose(p);
5961 return -1;
5962 }
5963 }
5964
5965 if ((initfunc = dlsym(p, "plugin_init")))
5966 {
5967 if (!initfunc(&funcs))
5968 {
5969 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5970 dlclose(p);
5971 return -1;
5972 }
5973 }
5974
5975 ll_push(loaded_plugins, p);
5976
5977 for (i = 0; i < max_plugin_functions; i++)
5978 {
5979 void *x;
5980 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5981 {
5982 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5983 ll_push(plugins[i], x);
5984 }
5985 }
5986
5987 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5988 return 1;
5989 }
5990
5991 static void run_plugin_done(void *plugin)
5992 {
5993 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5994
5995 if (donefunc)
5996 donefunc();
5997 }
5998
5999 static int remove_plugin(char *plugin_name)
6000 {
6001 void *p = open_plugin(plugin_name, 0);
6002 int loaded = 0;
6003
6004 if (!p)
6005 return -1;
6006
6007 if (ll_contains(loaded_plugins, p))
6008 {
6009 int i;
6010 for (i = 0; i < max_plugin_functions; i++)
6011 {
6012 void *x;
6013 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6014 ll_delete(plugins[i], x);
6015 }
6016
6017 ll_delete(loaded_plugins, p);
6018 run_plugin_done(p);
6019 loaded = 1;
6020 }
6021
6022 dlclose(p);
6023 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6024 return loaded;
6025 }
6026
6027 int run_plugins(int plugin_type, void *data)
6028 {
6029 int (*func)(void *data);
6030
6031 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6032 return PLUGIN_RET_ERROR;
6033
6034 ll_reset(plugins[plugin_type]);
6035 while ((func = ll_next(plugins[plugin_type])))
6036 {
6037 int r = func(data);
6038
6039 if (r != PLUGIN_RET_OK)
6040 return r; // stop here
6041 }
6042
6043 return PLUGIN_RET_OK;
6044 }
6045
6046 static void plugins_done()
6047 {
6048 void *p;
6049
6050 ll_reset(loaded_plugins);
6051 while ((p = ll_next(loaded_plugins)))
6052 run_plugin_done(p);
6053 }
6054
6055 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6056 {
6057 struct nsctl request;
6058 struct nsctl response;
6059 int type = unpack_control(&request, buf, len);
6060 int r;
6061 void *p;
6062
6063 if (log_stream && config->debug >= 4)
6064 {
6065 if (type < 0)
6066 {
6067 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6068 fmtaddr(addr->sin_addr.s_addr, 0), type);
6069 }
6070 else
6071 {
6072 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6073 dump_control(&request, log_stream);
6074 }
6075 }
6076
6077 switch (type)
6078 {
6079 case NSCTL_REQ_LOAD:
6080 if (request.argc != 1)
6081 {
6082 response.type = NSCTL_RES_ERR;
6083 response.argc = 1;
6084 response.argv[0] = "name of plugin required";
6085 }
6086 else if ((r = add_plugin(request.argv[0])) < 1)
6087 {
6088 response.type = NSCTL_RES_ERR;
6089 response.argc = 1;
6090 response.argv[0] = !r
6091 ? "plugin already loaded"
6092 : "error loading plugin";
6093 }
6094 else
6095 {
6096 response.type = NSCTL_RES_OK;
6097 response.argc = 0;
6098 }
6099
6100 break;
6101
6102 case NSCTL_REQ_UNLOAD:
6103 if (request.argc != 1)
6104 {
6105 response.type = NSCTL_RES_ERR;
6106 response.argc = 1;
6107 response.argv[0] = "name of plugin required";
6108 }
6109 else if ((r = remove_plugin(request.argv[0])) < 1)
6110 {
6111 response.type = NSCTL_RES_ERR;
6112 response.argc = 1;
6113 response.argv[0] = !r
6114 ? "plugin not loaded"
6115 : "plugin not found";
6116 }
6117 else
6118 {
6119 response.type = NSCTL_RES_OK;
6120 response.argc = 0;
6121 }
6122
6123 break;
6124
6125 case NSCTL_REQ_HELP:
6126 response.type = NSCTL_RES_OK;
6127 response.argc = 0;
6128
6129 ll_reset(loaded_plugins);
6130 while ((p = ll_next(loaded_plugins)))
6131 {
6132 char **help = dlsym(p, "plugin_control_help");
6133 while (response.argc < 0xff && help && *help)
6134 response.argv[response.argc++] = *help++;
6135 }
6136
6137 break;
6138
6139 case NSCTL_REQ_CONTROL:
6140 {
6141 struct param_control param = {
6142 config->cluster_iam_master,
6143 request.argc,
6144 request.argv,
6145 0,
6146 NULL,
6147 };
6148
6149 int r = run_plugins(PLUGIN_CONTROL, &param);
6150
6151 if (r == PLUGIN_RET_ERROR)
6152 {
6153 response.type = NSCTL_RES_ERR;
6154 response.argc = 1;
6155 response.argv[0] = param.additional
6156 ? param.additional
6157 : "error returned by plugin";
6158 }
6159 else if (r == PLUGIN_RET_NOTMASTER)
6160 {
6161 static char msg[] = "must be run on master: 000.000.000.000";
6162
6163 response.type = NSCTL_RES_ERR;
6164 response.argc = 1;
6165 if (config->cluster_master_address)
6166 {
6167 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6168 response.argv[0] = msg;
6169 }
6170 else
6171 {
6172 response.argv[0] = "must be run on master: none elected";
6173 }
6174 }
6175 else if (!(param.response & NSCTL_RESPONSE))
6176 {
6177 response.type = NSCTL_RES_ERR;
6178 response.argc = 1;
6179 response.argv[0] = param.response
6180 ? "unrecognised response value from plugin"
6181 : "unhandled action";
6182 }
6183 else
6184 {
6185 response.type = param.response;
6186 response.argc = 0;
6187 if (param.additional)
6188 {
6189 response.argc = 1;
6190 response.argv[0] = param.additional;
6191 }
6192 }
6193 }
6194
6195 break;
6196
6197 default:
6198 response.type = NSCTL_RES_ERR;
6199 response.argc = 1;
6200 response.argv[0] = "error unpacking control packet";
6201 }
6202
6203 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6204 if (!buf)
6205 {
6206 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6207 return;
6208 }
6209
6210 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6211 if (r > 0)
6212 {
6213 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6214 if (log_stream && config->debug >= 4)
6215 {
6216 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6217 dump_control(&response, log_stream);
6218 }
6219 }
6220 else
6221 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6222 fmtaddr(addr->sin_addr.s_addr, 0), r);
6223
6224 free(buf);
6225 }
6226
6227 static tunnelidt new_tunnel()
6228 {
6229 tunnelidt i;
6230 for (i = 1; i < MAXTUNNEL; i++)
6231 {
6232 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6233 {
6234 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6235 if (i > config->cluster_highest_tunnelid)
6236 config->cluster_highest_tunnelid = i;
6237 return i;
6238 }
6239 }
6240 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6241 return 0;
6242 }
6243
6244 //
6245 // We're becoming the master. Do any required setup..
6246 //
6247 // This is principally telling all the plugins that we're
6248 // now a master, and telling them about all the sessions
6249 // that are active too..
6250 //
6251 void become_master(void)
6252 {
6253 int s, i;
6254 static struct event_data d[RADIUS_FDS];
6255 struct epoll_event e;
6256
6257 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6258
6259 // running a bunch of iptables commands is slow and can cause
6260 // the master to drop tunnels on takeover--kludge around the
6261 // problem by forking for the moment (note: race)
6262 if (!fork_and_close())
6263 {
6264 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6265 {
6266 if (!session[s].opened) // Not an in-use session.
6267 continue;
6268
6269 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6270 }
6271 exit(0);
6272 }
6273
6274 // add radius fds
6275 e.events = EPOLLIN;
6276 for (i = 0; i < RADIUS_FDS; i++)
6277 {
6278 d[i].type = FD_TYPE_RADIUS;
6279 d[i].index = i;
6280 e.data.ptr = &d[i];
6281
6282 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6283 }
6284 }
6285
6286 int cmd_show_hist_idle(struct cli_def *cli, const char *command, char **argv, int argc)
6287 {
6288 int s, i;
6289 int count = 0;
6290 int buckets[64];
6291
6292 if (CLI_HELP_REQUESTED)
6293 return CLI_HELP_NO_ARGS;
6294
6295 time(&time_now);
6296 for (i = 0; i < 64;++i) buckets[i] = 0;
6297
6298 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6299 {
6300 int idle;
6301 if (!session[s].opened)
6302 continue;
6303
6304 idle = time_now - session[s].last_data;
6305 idle /= 5 ; // In multiples of 5 seconds.
6306 if (idle < 0)
6307 idle = 0;
6308 if (idle > 63)
6309 idle = 63;
6310
6311 ++count;
6312 ++buckets[idle];
6313 }
6314
6315 for (i = 0; i < 63; ++i)
6316 {
6317 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6318 }
6319 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6320 cli_print(cli, "%d total sessions open.", count);
6321 return CLI_OK;
6322 }
6323
6324 int cmd_show_hist_open(struct cli_def *cli, const char *command, char **argv, int argc)
6325 {
6326 int s, i;
6327 int count = 0;
6328 int buckets[64];
6329
6330 if (CLI_HELP_REQUESTED)
6331 return CLI_HELP_NO_ARGS;
6332
6333 time(&time_now);
6334 for (i = 0; i < 64;++i) buckets[i] = 0;
6335
6336 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6337 {
6338 int open = 0, d;
6339 if (!session[s].opened)
6340 continue;
6341
6342 d = time_now - session[s].opened;
6343 if (d < 0)
6344 d = 0;
6345 while (d > 1 && open < 32)
6346 {
6347 ++open;
6348 d >>= 1; // half.
6349 }
6350 ++count;
6351 ++buckets[open];
6352 }
6353
6354 s = 1;
6355 for (i = 0; i < 30; ++i)
6356 {
6357 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6358 s <<= 1;
6359 }
6360 cli_print(cli, "%d total sessions open.", count);
6361 return CLI_OK;
6362 }
6363
6364 /* Unhide an avp.
6365 *
6366 * This unencodes the AVP using the L2TP secret and the previously
6367 * stored random vector. It overwrites the hidden data with the
6368 * unhidden AVP subformat.
6369 */
6370 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6371 {
6372 MD5_CTX ctx;
6373 uint8_t digest[16];
6374 uint8_t *last;
6375 size_t d = 0;
6376 uint16_t m = htons(type);
6377
6378 // Compute initial pad
6379 MD5_Init(&ctx);
6380 MD5_Update(&ctx, (unsigned char *) &m, 2);
6381 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6382 MD5_Update(&ctx, vector, vec_len);
6383 MD5_Final(digest, &ctx);
6384
6385 // pointer to last decoded 16 octets
6386 last = value;
6387
6388 while (len > 0)
6389 {
6390 // calculate a new pad based on the last decoded block
6391 if (d >= sizeof(digest))
6392 {
6393 MD5_Init(&ctx);
6394 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6395 MD5_Update(&ctx, last, sizeof(digest));
6396 MD5_Final(digest, &ctx);
6397
6398 d = 0;
6399 last = value;
6400 }
6401
6402 *value++ ^= digest[d++];
6403 len--;
6404 }
6405 }
6406
6407 int find_filter(char const *name, size_t len)
6408 {
6409 int free = -1;
6410 int i;
6411
6412 for (i = 0; i < MAXFILTER; i++)
6413 {
6414 if (!*ip_filters[i].name)
6415 {
6416 if (free < 0)
6417 free = i;
6418
6419 continue;
6420 }
6421
6422 if (strlen(ip_filters[i].name) != len)
6423 continue;
6424
6425 if (!strncmp(ip_filters[i].name, name, len))
6426 return i;
6427 }
6428
6429 return free;
6430 }
6431
6432 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6433 {
6434 switch (p->op)
6435 {
6436 case FILTER_PORT_OP_EQ: return port == p->port;
6437 case FILTER_PORT_OP_NEQ: return port != p->port;
6438 case FILTER_PORT_OP_GT: return port > p->port;
6439 case FILTER_PORT_OP_LT: return port < p->port;
6440 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6441 }
6442
6443 return 0;
6444 }
6445
6446 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6447 {
6448 switch (op)
6449 {
6450 case FILTER_FLAG_OP_ANY:
6451 return (flags & sflags) || (~flags & cflags);
6452
6453 case FILTER_FLAG_OP_ALL:
6454 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6455
6456 case FILTER_FLAG_OP_EST:
6457 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6458 }
6459
6460 return 0;
6461 }
6462
6463 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6464 {
6465 uint16_t frag_offset;
6466 uint8_t proto;
6467 in_addr_t src_ip;
6468 in_addr_t dst_ip;
6469 uint16_t src_port = 0;
6470 uint16_t dst_port = 0;
6471 uint8_t flags = 0;
6472 ip_filter_rulet *rule;
6473
6474 if (len < 20) // up to end of destination address
6475 return 0;
6476
6477 if ((*buf >> 4) != 4) // IPv4
6478 return 0;
6479
6480 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6481 proto = buf[9];
6482 src_ip = *(in_addr_t *) (buf + 12);
6483 dst_ip = *(in_addr_t *) (buf + 16);
6484
6485 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6486 {
6487 int l = (buf[0] & 0xf) * 4; // length of IP header
6488 if (len < l + 4) // ports
6489 return 0;
6490
6491 src_port = ntohs(*(uint16_t *) (buf + l));
6492 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6493 if (proto == IPPROTO_TCP)
6494 {
6495 if (len < l + 14) // flags
6496 return 0;
6497
6498 flags = buf[l + 13] & 0x3f;
6499 }
6500 }
6501
6502 for (rule = ip_filters[filter].rules; rule->action; rule++)
6503 {
6504 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6505 continue;
6506
6507 if (rule->src_wild != INADDR_BROADCAST &&
6508 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6509 continue;
6510
6511 if (rule->dst_wild != INADDR_BROADCAST &&
6512 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6513 continue;
6514
6515 if (frag_offset)
6516 {
6517 // layer 4 deny rules are skipped
6518 if (rule->action == FILTER_ACTION_DENY &&
6519 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6520 continue;
6521 }
6522 else
6523 {
6524 if (rule->frag)
6525 continue;
6526
6527 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6528 {
6529 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6530 continue;
6531
6532 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6533 continue;
6534
6535 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6536 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6537 continue;
6538 }
6539 }
6540
6541 // matched
6542 rule->counter++;
6543 return rule->action == FILTER_ACTION_PERMIT;
6544 }
6545
6546 // default deny
6547 return 0;
6548 }
6549
6550 tunnelidt lac_new_tunnel()
6551 {
6552 return new_tunnel();
6553 }
6554
6555 void lac_tunnelclear(tunnelidt t)
6556 {
6557 tunnelclear(t);
6558 }
6559
6560 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6561 {
6562 uint16_t version = 0x0100; // protocol version
6563
6564 tunnel[t].state = TUNNELOPENING;
6565
6566 // Sent SCCRQ - Start Control Connection Request
6567 controlt *c = controlnew(1); // sending SCCRQ
6568 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6569 controls(c, 8, Vendor_name, 1); // Vendor name
6570 control16(c, 2, version, 1); // protocol version
6571 control32(c, 3, 3, 1); // framing Capabilities
6572 control16(c, 9, t, 1); // assigned tunnel
6573 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6574 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6575 controladd(c, 0, t); // send
6576 }
6577
6578 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6579 {
6580 // Sent ICRQ Incoming-call-request
6581 controlt *c = controlnew(10); // ICRQ
6582
6583 control16(c, 14, s, 1); // assigned sesion
6584 call_serial_number++;
6585 control32(c, 15, call_serial_number, 1); // call serial number
6586 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6587 controladd(c, 0, t); // send
6588 }
6589
6590 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6591 {
6592 tunnelshutdown(t, reason, result, error, msg);
6593 }
6594