07a45f7882dee05cbcb49e1b122812355d2e1c0f
[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 "dhcp6.h"
44 #include "l2tpns.h"
45 #include "cluster.h"
46 #include "plugin.h"
47 #include "ll.h"
48 #include "constants.h"
49 #include "control.h"
50 #include "util.h"
51 #include "tbf.h"
52
53 #ifdef BGP
54 #include "bgp.h"
55 #endif
56
57 #include "l2tplac.h"
58 #include "pppoe.h"
59 #include "dhcp6.h"
60
61 char * Vendor_name = "Linux L2TPNS";
62 uint32_t call_serial_number = 0;
63
64 // Globals
65 configt *config = NULL; // all configuration
66 int nlfd = -1; // netlink socket
67 int tunfd = -1; // tun interface file handle. (network device)
68 int udpfd[MAX_UDPFD + 1] = INIT_TABUDPFD; // array UDP file handle + 1 for lac udp
69 int udplacfd = -1; // UDP LAC file handle
70 int controlfd = -1; // Control signal handle
71 int clifd = -1; // Socket listening for CLI connections.
72 int daefd = -1; // Socket listening for DAE connections.
73 int snoopfd = -1; // UDP file handle for sending out intercept data
74 int *radfds = NULL; // RADIUS requests file handles
75 int rand_fd = -1; // Random data source
76 int cluster_sockfd = -1; // Intra-cluster communications socket.
77 int epollfd = -1; // event polling
78 time_t basetime = 0; // base clock
79 char hostname[MAXHOSTNAME] = ""; // us.
80 static int tunidx; // ifr_ifindex of tun device
81 int nlseqnum = 0; // netlink sequence number
82 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
83 static int syslog_log = 0; // are we logging to syslog
84 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
85 uint32_t last_id = 0; // Unique ID for radius accounting
86 // Guest change
87 char guest_users[10][32]; // Array of guest users
88 int guest_accounts_num = 0; // Number of guest users
89
90 // calculated from config->l2tp_mtu
91 uint16_t MRU = 0; // PPP MRU
92 uint16_t MSS = 0; // TCP MSS
93
94 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
95 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
96
97 union iphash {
98 sessionidt sess;
99 union iphash *idx;
100 } ip_hash[256]; // Mapping from IP address to session structures.
101
102 struct ipv6radix {
103 sessionidt sess;
104 struct ipv6radix *branch;
105 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
106
107 // Traffic counters.
108 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
109 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
110 uint32_t eth_tx = 0;
111
112 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
113 time_t time_now = 0; // Current time in seconds since epoch.
114 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
115 static char time_now_string[64] = {0}; // Current time as a string.
116 static int time_changed = 0; // time_now changed
117 char main_quit = 0; // True if we're in the process of exiting.
118 static char main_reload = 0; // Re-load pending
119 linked_list *loaded_plugins;
120 linked_list *plugins[MAX_PLUGIN_TYPES];
121
122 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
123 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
124
125 config_descriptt config_values[] = {
126 CONFIG("debug", debug, INT),
127 CONFIG("log_file", log_filename, STRING),
128 CONFIG("pid_file", pid_file, STRING),
129 CONFIG("random_device", random_device, STRING),
130 CONFIG("l2tp_secret", l2tp_secret, STRING),
131 CONFIG("l2tp_mtu", l2tp_mtu, INT),
132 CONFIG("ppp_restart_time", ppp_restart_time, INT),
133 CONFIG("ppp_max_configure", ppp_max_configure, INT),
134 CONFIG("ppp_max_failure", ppp_max_failure, INT),
135 CONFIG("primary_dns", default_dns1, IPv4),
136 CONFIG("secondary_dns", default_dns2, IPv4),
137 CONFIG("primary_radius", radiusserver[0], IPv4),
138 CONFIG("secondary_radius", radiusserver[1], IPv4),
139 CONFIG("primary_radius_port", radiusport[0], SHORT),
140 CONFIG("secondary_radius_port", radiusport[1], SHORT),
141 CONFIG("radius_accounting", radius_accounting, BOOL),
142 CONFIG("radius_interim", radius_interim, INT),
143 CONFIG("radius_secret", radiussecret, STRING),
144 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
145 CONFIG("radius_dae_port", radius_dae_port, SHORT),
146 CONFIG("radius_bind_min", radius_bind_min, SHORT),
147 CONFIG("radius_bind_max", radius_bind_max, SHORT),
148 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
149 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
150 CONFIG("guest_account", guest_user, STRING),
151 CONFIG("bind_address", bind_address, IPv4),
152 CONFIG("peer_address", peer_address, IPv4),
153 CONFIG("send_garp", send_garp, BOOL),
154 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
155 CONFIG("throttle_buckets", num_tbfs, INT),
156 CONFIG("accounting_dir", accounting_dir, STRING),
157 CONFIG("account_all_origin", account_all_origin, BOOL),
158 CONFIG("dump_speed", dump_speed, BOOL),
159 CONFIG("multi_read_count", multi_read_count, INT),
160 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
161 CONFIG("lock_pages", lock_pages, BOOL),
162 CONFIG("icmp_rate", icmp_rate, INT),
163 CONFIG("packet_limit", max_packets, INT),
164 CONFIG("cluster_address", cluster_address, IPv4),
165 CONFIG("cluster_interface", cluster_interface, STRING),
166 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
167 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
168 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
169 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
170 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
171 CONFIG("cli_bind_address", cli_bind_address, IPv4),
172 CONFIG("hostname", hostname, STRING),
173 #ifdef BGP
174 CONFIG("nexthop_address", nexthop_address, IPv4),
175 CONFIG("nexthop6_address", nexthop6_address, IPv6),
176 #endif
177 CONFIG("echo_timeout", echo_timeout, INT),
178 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
179 CONFIG("iftun_address", iftun_address, IPv4),
180 CONFIG("tundevicename", tundevicename, STRING),
181 CONFIG("disable_lac_func", disable_lac_func, BOOL),
182 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
183 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
184 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
185 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
186 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
187 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
188 CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
189 CONFIG("disable_no_spoof", disable_no_spoof, BOOL),
190 CONFIG("bind_multi_address", bind_multi_address, STRING),
191 CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name, BOOL),
192 CONFIG("multi_hostname", multi_hostname, STRING),
193 CONFIG("no_throttle_local_IP", no_throttle_local_IP, BOOL),
194 CONFIG("dhcp6_preferred_lifetime", dhcp6_preferred_lifetime, INT),
195 CONFIG("dhcp6_valid_lifetime", dhcp6_valid_lifetime, INT),
196 CONFIG("dhcp6_server_duid", dhcp6_server_duid, INT),
197 CONFIG("primary_ipv6_dns", default_ipv6_dns1, IPv6),
198 CONFIG("secondary_ipv6_dns", default_ipv6_dns2, IPv6),
199 CONFIG("default_ipv6_domain_list", default_ipv6_domain_list, STRING),
200 { NULL, 0, 0, 0 }
201 };
202
203 static char *plugin_functions[] = {
204 NULL,
205 "plugin_pre_auth",
206 "plugin_post_auth",
207 "plugin_timer",
208 "plugin_new_session",
209 "plugin_kill_session",
210 "plugin_control",
211 "plugin_radius_response",
212 "plugin_radius_reset",
213 "plugin_radius_account",
214 "plugin_become_master",
215 "plugin_new_session_master",
216 };
217
218 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
219
220 // Counters for shutdown sessions
221 static sessiont shut_acct[8192];
222 static sessionidt shut_acct_n = 0;
223
224 tunnelt *tunnel = NULL; // Array of tunnel structures.
225 bundlet *bundle = NULL; // Array of bundle structures.
226 fragmentationt *frag = NULL; // Array of fragmentation structures.
227 sessiont *session = NULL; // Array of session structures.
228 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
229 radiust *radius = NULL; // Array of radius structures.
230 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
231 ip_filtert *ip_filters = NULL; // Array of named filters.
232 static controlt *controlfree = 0;
233 struct Tstats *_statistics = NULL;
234 #ifdef RINGBUFFER
235 struct Tringbuffer *ringbuffer = NULL;
236 #endif
237
238 static ssize_t netlink_send(struct nlmsghdr *nh);
239 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
240 static void cache_ipmap(in_addr_t ip, sessionidt s);
241 static void uncache_ipmap(in_addr_t ip);
242 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
243 static void free_ip_address(sessionidt s);
244 static void dump_acct_info(int all);
245 static void sighup_handler(int sig);
246 static void shutdown_handler(int sig);
247 static void sigchild_handler(int sig);
248 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
249 static void update_config(void);
250 static void read_config_file(void);
251 static void initplugins(void);
252 static int add_plugin(char *plugin_name);
253 static int remove_plugin(char *plugin_name);
254 static void plugins_done(void);
255 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
256 static tunnelidt new_tunnel(void);
257 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
258 static void bundleclear(bundleidt b);
259
260 // return internal time (10ths since process startup), set f if given
261 // as a side-effect sets time_now, and time_changed
262 static clockt now(double *f)
263 {
264 struct timeval t;
265 gettimeofday(&t, 0);
266 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
267 if (t.tv_sec != time_now)
268 {
269 time_now = t.tv_sec;
270 time_changed++;
271 }
272
273 // Time in milliseconds
274 // TODO FOR MLPPP DEV
275 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
276
277 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
278 }
279
280 // work out a retry time based on try number
281 // This is a straight bounded exponential backoff.
282 // Maximum re-try time is 32 seconds. (2^5).
283 clockt backoff(uint8_t try)
284 {
285 if (try > 5) try = 5; // max backoff
286 return now(NULL) + 10 * (1 << try);
287 }
288
289
290 //
291 // Log a debug message. Typically called via the LOG macro
292 //
293 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
294 {
295 static char message[65536] = {0};
296 va_list ap;
297
298 #ifdef RINGBUFFER
299 if (ringbuffer)
300 {
301 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
302 ringbuffer->tail = 0;
303 if (ringbuffer->tail == ringbuffer->head)
304 if (++ringbuffer->head >= RINGBUFFER_SIZE)
305 ringbuffer->head = 0;
306
307 ringbuffer->buffer[ringbuffer->tail].level = level;
308 ringbuffer->buffer[ringbuffer->tail].session = s;
309 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
310 va_start(ap, format);
311 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
312 va_end(ap);
313 }
314 #endif
315
316 if (config->debug < level) return;
317
318 va_start(ap, format);
319 vsnprintf(message, sizeof(message), format, ap);
320
321 if (log_stream)
322 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
323 else if (syslog_log)
324 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
325
326 va_end(ap);
327 }
328
329 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
330 {
331 int i, j;
332 const uint8_t *d = data;
333
334 if (config->debug < level) return;
335
336 // No support for _log_hex to syslog
337 if (log_stream)
338 {
339 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
340 setvbuf(log_stream, NULL, _IOFBF, 16384);
341
342 for (i = 0; i < maxsize; )
343 {
344 fprintf(log_stream, "%4X: ", i);
345 for (j = i; j < maxsize && j < (i + 16); j++)
346 {
347 fprintf(log_stream, "%02X ", d[j]);
348 if (j == i + 7)
349 fputs(": ", log_stream);
350 }
351
352 for (; j < i + 16; j++)
353 {
354 fputs(" ", log_stream);
355 if (j == i + 7)
356 fputs(": ", log_stream);
357 }
358
359 fputs(" ", log_stream);
360 for (j = i; j < maxsize && j < (i + 16); j++)
361 {
362 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
363 fputc(d[j], log_stream);
364 else
365 fputc('.', log_stream);
366
367 if (j == i + 7)
368 fputs(" ", log_stream);
369 }
370
371 i = j;
372 fputs("\n", log_stream);
373 }
374
375 fflush(log_stream);
376 setbuf(log_stream, NULL);
377 }
378 }
379
380 // update a counter, accumulating 2^32 wraps
381 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
382 {
383 uint32_t new = *counter + delta;
384 if (new < *counter)
385 (*wrap)++;
386
387 *counter = new;
388 }
389
390 // initialise the random generator
391 static void initrandom(char *source)
392 {
393 static char path[sizeof(config->random_device)] = "*undefined*";
394
395 // reinitialise only if we are forced to do so or if the config has changed
396 if (source && !strncmp(path, source, sizeof(path)))
397 return;
398
399 // close previous source, if any
400 if (rand_fd >= 0)
401 close(rand_fd);
402
403 rand_fd = -1;
404
405 if (source)
406 {
407 // register changes
408 snprintf(path, sizeof(path), "%s", source);
409
410 if (*path == '/')
411 {
412 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
413 if (rand_fd < 0)
414 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
415 path, strerror(errno));
416 }
417 }
418 }
419
420 // fill buffer with random data
421 void random_data(uint8_t *buf, int len)
422 {
423 int n = 0;
424
425 CSTAT(random_data);
426 if (rand_fd >= 0)
427 {
428 n = read(rand_fd, buf, len);
429 if (n >= len) return;
430 if (n < 0)
431 {
432 if (errno != EAGAIN)
433 {
434 LOG(0, 0, 0, "Error reading from random source: %s\n",
435 strerror(errno));
436
437 // fall back to rand()
438 initrandom(NULL);
439 }
440
441 n = 0;
442 }
443 }
444
445 // append missing data
446 while (n < len)
447 // not using the low order bits from the prng stream
448 buf[n++] = (rand() >> 4) & 0xff;
449 }
450
451 // Add a route
452 //
453 // This adds it to the routing table, advertises it
454 // via BGP if enabled, and stuffs it into the
455 // 'sessionbyip' cache.
456 //
457 // 'ip' must be in _host_ order.
458 //
459 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
460 {
461 struct {
462 struct nlmsghdr nh;
463 struct rtmsg rt;
464 char buf[32];
465 } req;
466 int i;
467 in_addr_t n_ip;
468
469 if (!prefixlen) prefixlen = 32;
470
471 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
472
473 memset(&req, 0, sizeof(req));
474
475 if (add)
476 {
477 req.nh.nlmsg_type = RTM_NEWROUTE;
478 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
479 }
480 else
481 {
482 req.nh.nlmsg_type = RTM_DELROUTE;
483 req.nh.nlmsg_flags = NLM_F_REQUEST;
484 }
485
486 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
487
488 req.rt.rtm_family = AF_INET;
489 req.rt.rtm_dst_len = prefixlen;
490 req.rt.rtm_table = RT_TABLE_MAIN;
491 req.rt.rtm_protocol = 42;
492 req.rt.rtm_scope = RT_SCOPE_LINK;
493 req.rt.rtm_type = RTN_UNICAST;
494
495 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
496 n_ip = htonl(ip);
497 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
498 if (gw)
499 {
500 n_ip = htonl(gw);
501 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
502 }
503
504 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
505 fmtaddr(htonl(ip), 0), prefixlen,
506 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
507
508 if (netlink_send(&req.nh) < 0)
509 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
510
511 #ifdef BGP
512 if (add)
513 bgp_add_route(htonl(ip), prefixlen);
514 else
515 bgp_del_route(htonl(ip), prefixlen);
516 #endif /* BGP */
517
518 // Add/Remove the IPs to the 'sessionbyip' cache.
519 // Note that we add the zero address in the case of
520 // a network route. Roll on CIDR.
521
522 // Note that 's == 0' implies this is the address pool.
523 // We still cache it here, because it will pre-fill
524 // the malloc'ed tree.
525
526 if (s)
527 {
528 if (!add) // Are we deleting a route?
529 s = 0; // Caching the session as '0' is the same as uncaching.
530
531 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
532 cache_ipmap(i, s);
533 }
534 }
535
536 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
537 {
538 struct {
539 struct nlmsghdr nh;
540 struct rtmsg rt;
541 char buf[64];
542 } req;
543 int metric;
544 char ipv6addr[INET6_ADDRSTRLEN];
545
546 if (!config->ipv6_prefix.s6_addr[0])
547 {
548 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
549 return;
550 }
551
552 memset(&req, 0, sizeof(req));
553
554 if (add)
555 {
556 req.nh.nlmsg_type = RTM_NEWROUTE;
557 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
558 }
559 else
560 {
561 req.nh.nlmsg_type = RTM_DELROUTE;
562 req.nh.nlmsg_flags = NLM_F_REQUEST;
563 }
564
565 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
566
567 req.rt.rtm_family = AF_INET6;
568 req.rt.rtm_dst_len = prefixlen;
569 req.rt.rtm_table = RT_TABLE_MAIN;
570 req.rt.rtm_protocol = 42;
571 req.rt.rtm_scope = RT_SCOPE_LINK;
572 req.rt.rtm_type = RTN_UNICAST;
573
574 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
575 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
576 metric = 1;
577 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
578
579 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
580 add ? "add" : "del",
581 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
582 prefixlen);
583
584 if (netlink_send(&req.nh) < 0)
585 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
586
587 #ifdef BGP
588 if (add)
589 bgp_add_route6(ip, prefixlen);
590 else
591 bgp_del_route6(ip, prefixlen);
592 #endif /* BGP */
593
594 if (s)
595 {
596 if (!add) // Are we deleting a route?
597 s = 0; // Caching the session as '0' is the same as uncaching.
598
599 cache_ipv6map(ip, prefixlen, s);
600 }
601
602 return;
603 }
604
605 //
606 // Set up netlink socket
607 static void initnetlink(void)
608 {
609 struct sockaddr_nl nladdr;
610
611 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
612 if (nlfd < 0)
613 {
614 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
615 exit(1);
616 }
617
618 memset(&nladdr, 0, sizeof(nladdr));
619 nladdr.nl_family = AF_NETLINK;
620 nladdr.nl_pid = getpid();
621
622 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
623 {
624 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
625 exit(1);
626 }
627 }
628
629 static ssize_t netlink_send(struct nlmsghdr *nh)
630 {
631 struct sockaddr_nl nladdr;
632 struct iovec iov;
633 struct msghdr msg;
634
635 nh->nlmsg_pid = getpid();
636 nh->nlmsg_seq = ++nlseqnum;
637
638 // set kernel address
639 memset(&nladdr, 0, sizeof(nladdr));
640 nladdr.nl_family = AF_NETLINK;
641
642 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
643 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
644
645 return sendmsg(nlfd, &msg, 0);
646 }
647
648 static ssize_t netlink_recv(void *buf, ssize_t len)
649 {
650 struct sockaddr_nl nladdr;
651 struct iovec iov;
652 struct msghdr msg;
653
654 // set kernel address
655 memset(&nladdr, 0, sizeof(nladdr));
656 nladdr.nl_family = AF_NETLINK;
657
658 iov = (struct iovec){ buf, len };
659 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
660
661 return recvmsg(nlfd, &msg, 0);
662 }
663
664 /* adapted from iproute2 */
665 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
666 {
667 int len = RTA_LENGTH(alen);
668 struct rtattr *rta;
669
670 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
671 rta->rta_type = type;
672 rta->rta_len = len;
673 memcpy(RTA_DATA(rta), data, alen);
674 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
675 }
676
677 // messages corresponding to different phases seq number
678 static char *tun_nl_phase_msg[] = {
679 "initialized",
680 "getting tun interface index",
681 "setting tun interface parameters",
682 "setting tun IPv4 address",
683 "setting tun LL IPv6 address",
684 "setting tun global IPv6 address",
685 };
686
687 //
688 // Set up TUN interface
689 static void inittun(void)
690 {
691 struct ifreq ifr;
692
693 memset(&ifr, 0, sizeof(ifr));
694 ifr.ifr_flags = IFF_TUN;
695
696 tunfd = open(TUNDEVICE, O_RDWR);
697 if (tunfd < 0)
698 { // fatal
699 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
700 exit(1);
701 }
702 {
703 int flags = fcntl(tunfd, F_GETFL, 0);
704 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
705 }
706
707 if (*config->tundevicename)
708 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
709
710 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
711 {
712 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
713 exit(1);
714 }
715 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
716 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
717
718 tunidx = if_nametoindex(config->tundevicename);
719 if (tunidx == 0)
720 {
721 LOG(0, 0, 0, "Can't get tun interface index\n");
722 exit(1);
723 }
724
725 {
726 struct {
727 // interface setting
728 struct nlmsghdr nh;
729 union {
730 struct ifinfomsg ifinfo;
731 struct ifaddrmsg ifaddr;
732 } ifmsg;
733 char rtdata[32]; // 32 should be enough
734 } req;
735 uint32_t txqlen, mtu;
736 in_addr_t ip;
737
738 memset(&req, 0, sizeof(req));
739
740 req.nh.nlmsg_type = RTM_NEWLINK;
741 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
742 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
743
744 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
745 req.ifmsg.ifinfo.ifi_index = tunidx;
746 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
747 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
748
749 /* Bump up the qlen to deal with bursts from the network */
750 txqlen = 1000;
751 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
752 /* set MTU to modem MRU */
753 mtu = MRU;
754 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
755
756 if (netlink_send(&req.nh) < 0)
757 goto senderror;
758
759 memset(&req, 0, sizeof(req));
760
761 req.nh.nlmsg_type = RTM_NEWADDR;
762 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
763 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
764
765 req.ifmsg.ifaddr.ifa_family = AF_INET;
766 req.ifmsg.ifaddr.ifa_prefixlen = 32;
767 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
768 req.ifmsg.ifaddr.ifa_index = tunidx;
769
770 if (config->nbmultiaddress > 1)
771 {
772 int i;
773 for (i = 0; i < config->nbmultiaddress ; i++)
774 {
775 ip = config->iftun_n_address[i];
776 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
777 if (netlink_send(&req.nh) < 0)
778 goto senderror;
779 }
780 }
781 else
782 {
783 if (config->iftun_address)
784 ip = config->iftun_address;
785 else
786 ip = 0x01010101; // 1.1.1.1
787 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
788
789 if (netlink_send(&req.nh) < 0)
790 goto senderror;
791 }
792
793
794
795 // Only setup IPv6 on the tun device if we have a configured prefix
796 if (config->ipv6_prefix.s6_addr[0]) {
797 struct in6_addr ip6;
798
799 memset(&req, 0, sizeof(req));
800
801 req.nh.nlmsg_type = RTM_NEWADDR;
802 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
803 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
804
805 req.ifmsg.ifaddr.ifa_family = AF_INET6;
806 req.ifmsg.ifaddr.ifa_prefixlen = 64;
807 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
808 req.ifmsg.ifaddr.ifa_index = tunidx;
809
810 // Link local address is FE80::1
811 memset(&ip6, 0, sizeof(ip6));
812 ip6.s6_addr[0] = 0xFE;
813 ip6.s6_addr[1] = 0x80;
814 ip6.s6_addr[15] = 1;
815 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
816
817 if (netlink_send(&req.nh) < 0)
818 goto senderror;
819
820 memset(&req, 0, sizeof(req));
821
822 req.nh.nlmsg_type = RTM_NEWADDR;
823 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
824 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
825
826 req.ifmsg.ifaddr.ifa_family = AF_INET6;
827 req.ifmsg.ifaddr.ifa_prefixlen = 64;
828 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
829 req.ifmsg.ifaddr.ifa_index = tunidx;
830
831 // Global address is prefix::1
832 ip6 = config->ipv6_prefix;
833 ip6.s6_addr[15] = 1;
834 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
835
836 if (netlink_send(&req.nh) < 0)
837 goto senderror;
838 }
839
840 memset(&req, 0, sizeof(req));
841
842 req.nh.nlmsg_type = NLMSG_DONE;
843 req.nh.nlmsg_len = NLMSG_LENGTH(0);
844
845 if (netlink_send(&req.nh) < 0)
846 goto senderror;
847
848 // if we get an error for seqnum < min_initok_nlseqnum,
849 // we must exit as initialization went wrong
850 if (config->ipv6_prefix.s6_addr[0])
851 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
852 else
853 min_initok_nlseqnum = 3 + 1; // idx + if + addr
854 }
855
856 return;
857
858 senderror:
859 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
860 exit(1);
861 }
862
863 // set up LAC UDP ports
864 static void initlacudp(void)
865 {
866 int on = 1;
867 struct sockaddr_in addr;
868
869 // Tunnel to Remote LNS
870 memset(&addr, 0, sizeof(addr));
871 addr.sin_family = AF_INET;
872 addr.sin_port = htons(config->bind_portremotelns);
873 addr.sin_addr.s_addr = config->bind_address_remotelns;
874 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
875 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
876 {
877 int flags = fcntl(udplacfd, F_GETFL, 0);
878 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
879 }
880 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
881 {
882 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
883 exit(1);
884 }
885 }
886
887 // set up control ports
888 static void initcontrol(void)
889 {
890 int on = 1;
891 struct sockaddr_in addr;
892
893 // Control
894 memset(&addr, 0, sizeof(addr));
895 addr.sin_family = AF_INET;
896 addr.sin_port = htons(NSCTL_PORT);
897 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
898 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
899 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
900 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
901 {
902 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
903 exit(1);
904 }
905 }
906
907 // set up Dynamic Authorization Extensions to RADIUS port
908 static void initdae(void)
909 {
910 int on = 1;
911 struct sockaddr_in addr;
912
913 // Dynamic Authorization Extensions to RADIUS
914 memset(&addr, 0, sizeof(addr));
915 addr.sin_family = AF_INET;
916 addr.sin_port = htons(config->radius_dae_port);
917 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
918 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
919 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
920 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
921 {
922 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
923 exit(1);
924 }
925 }
926
927 // set up UDP ports
928 static void initudp(int * pudpfd, in_addr_t ip_bind)
929 {
930 int on = 1;
931 struct sockaddr_in addr;
932
933 // Tunnel
934 memset(&addr, 0, sizeof(addr));
935 addr.sin_family = AF_INET;
936 addr.sin_port = htons(L2TPPORT);
937 addr.sin_addr.s_addr = ip_bind;
938 (*pudpfd) = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
939 setsockopt((*pudpfd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
940 {
941 int flags = fcntl((*pudpfd), F_GETFL, 0);
942 fcntl((*pudpfd), F_SETFL, flags | O_NONBLOCK);
943 }
944 if (bind((*pudpfd), (struct sockaddr *) &addr, sizeof(addr)) < 0)
945 {
946 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
947 exit(1);
948 }
949 }
950
951 //
952 // Find session by IP, < 1 for not found
953 //
954 // Confusingly enough, this 'ip' must be
955 // in _network_ order. This being the common
956 // case when looking it up from IP packet headers.
957 //
958 // We actually use this cache for two things.
959 // #1. For used IP addresses, this maps to the
960 // session ID that it's used by.
961 // #2. For un-used IP addresses, this maps to the
962 // index into the pool table that contains that
963 // IP address.
964 //
965
966 static sessionidt lookup_ipmap(in_addr_t ip)
967 {
968 uint8_t *a = (uint8_t *) &ip;
969 union iphash *h = ip_hash;
970
971 if (!(h = h[*a++].idx)) return 0;
972 if (!(h = h[*a++].idx)) return 0;
973 if (!(h = h[*a++].idx)) return 0;
974
975 return h[*a].sess;
976 }
977
978 static sessionidt lookup_ipv6map(struct in6_addr ip)
979 {
980 struct ipv6radix *curnode;
981 int i;
982 int s;
983 char ipv6addr[INET6_ADDRSTRLEN];
984
985 curnode = &ipv6_hash[ip.s6_addr[0]];
986 i = 1;
987 s = curnode->sess;
988
989 while (s == 0 && i < 15 && curnode->branch != NULL)
990 {
991 curnode = &curnode->branch[ip.s6_addr[i]];
992 s = curnode->sess;
993 i++;
994 }
995
996 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
997 inet_ntop(AF_INET6, &ip, ipv6addr,
998 INET6_ADDRSTRLEN),
999 s);
1000
1001 return s;
1002 }
1003
1004 sessionidt sessionbyip(in_addr_t ip)
1005 {
1006 sessionidt s = lookup_ipmap(ip);
1007 CSTAT(sessionbyip);
1008
1009 if (s > 0 && s < MAXSESSION && session[s].opened)
1010 return s;
1011
1012 return 0;
1013 }
1014
1015 sessionidt sessionbyipv6(struct in6_addr ip)
1016 {
1017 sessionidt s;
1018 CSTAT(sessionbyipv6);
1019
1020 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
1021 (ip.s6_addr[0] == 0xFE &&
1022 ip.s6_addr[1] == 0x80 &&
1023 ip.s6_addr16[1] == 0 &&
1024 ip.s6_addr16[2] == 0 &&
1025 ip.s6_addr16[3] == 0))
1026 {
1027 in_addr_t *pipv4 = (in_addr_t *) &ip.s6_addr[8];
1028 s = lookup_ipmap(*pipv4);
1029 } else {
1030 s = lookup_ipv6map(ip);
1031 }
1032
1033 if (s > 0 && s < MAXSESSION && session[s].opened)
1034 return s;
1035
1036 return 0;
1037 }
1038
1039 //
1040 // Take an IP address in HOST byte order and
1041 // add it to the sessionid by IP cache.
1042 //
1043 // (It's actually cached in network order)
1044 //
1045 static void cache_ipmap(in_addr_t ip, sessionidt s)
1046 {
1047 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1048 uint8_t *a = (uint8_t *) &nip;
1049 union iphash *h = ip_hash;
1050 int i;
1051
1052 for (i = 0; i < 3; i++)
1053 {
1054 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1055 return;
1056
1057 h = h[a[i]].idx;
1058 }
1059
1060 h[a[3]].sess = s;
1061
1062 if (s > 0)
1063 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1064
1065 else if (s == 0)
1066 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1067 // else a map to an ip pool index.
1068 }
1069
1070 static void uncache_ipmap(in_addr_t ip)
1071 {
1072 cache_ipmap(ip, 0); // Assign it to the NULL session.
1073 }
1074
1075 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1076 {
1077 int i;
1078 int bytes;
1079 struct ipv6radix *curnode;
1080 char ipv6addr[INET6_ADDRSTRLEN];
1081
1082 curnode = &ipv6_hash[ip.s6_addr[0]];
1083
1084 bytes = prefixlen >> 3;
1085 i = 1;
1086 while (i < bytes) {
1087 if (curnode->branch == NULL)
1088 {
1089 if (!(curnode->branch = calloc(256,
1090 sizeof (struct ipv6radix))))
1091 return;
1092 }
1093 curnode = &curnode->branch[ip.s6_addr[i]];
1094 i++;
1095 }
1096
1097 curnode->sess = s;
1098
1099 if (s > 0)
1100 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1101 inet_ntop(AF_INET6, &ip, ipv6addr,
1102 INET6_ADDRSTRLEN),
1103 prefixlen);
1104 else if (s == 0)
1105 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1106 inet_ntop(AF_INET6, &ip, ipv6addr,
1107 INET6_ADDRSTRLEN),
1108 prefixlen);
1109 }
1110
1111 //
1112 // CLI list to dump current ipcache.
1113 //
1114 int cmd_show_ipcache(struct cli_def *cli, const char *command, char **argv, int argc)
1115 {
1116 union iphash *d = ip_hash, *e, *f, *g;
1117 int i, j, k, l;
1118 int count = 0;
1119
1120 if (CLI_HELP_REQUESTED)
1121 return CLI_HELP_NO_ARGS;
1122
1123 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1124
1125 for (i = 0; i < 256; ++i)
1126 {
1127 if (!d[i].idx)
1128 continue;
1129
1130 e = d[i].idx;
1131 for (j = 0; j < 256; ++j)
1132 {
1133 if (!e[j].idx)
1134 continue;
1135
1136 f = e[j].idx;
1137 for (k = 0; k < 256; ++k)
1138 {
1139 if (!f[k].idx)
1140 continue;
1141
1142 g = f[k].idx;
1143 for (l = 0; l < 256; ++l)
1144 {
1145 if (!g[l].sess)
1146 continue;
1147
1148 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1149 ++count;
1150 }
1151 }
1152 }
1153 }
1154 cli_print(cli, "%d entries in cache", count);
1155 return CLI_OK;
1156 }
1157
1158
1159 // Find session by username, 0 for not found
1160 // walled garden users aren't authenticated, so the username is
1161 // reasonably useless. Ignore them to avoid incorrect actions
1162 //
1163 // This is VERY inefficent. Don't call it often. :)
1164 //
1165 sessionidt sessionbyuser(char *username)
1166 {
1167 int s;
1168 CSTAT(sessionbyuser);
1169
1170 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1171 {
1172 if (!session[s].opened)
1173 continue;
1174
1175 if (session[s].walled_garden)
1176 continue; // Skip walled garden users.
1177
1178 if (!strncmp(session[s].user, username, 128))
1179 return s;
1180
1181 }
1182 return 0; // Not found.
1183 }
1184
1185 void send_garp(in_addr_t ip)
1186 {
1187 int s;
1188 struct ifreq ifr;
1189 uint8_t mac[6];
1190
1191 s = socket(PF_INET, SOCK_DGRAM, 0);
1192 if (s < 0)
1193 {
1194 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1195 return;
1196 }
1197 memset(&ifr, 0, sizeof(ifr));
1198 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1199 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1200 {
1201 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1202 close(s);
1203 return;
1204 }
1205 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1206 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1207 {
1208 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1209 close(s);
1210 return;
1211 }
1212 close(s);
1213 sendarp(ifr.ifr_ifindex, mac, ip);
1214 }
1215
1216 static sessiont *sessiontbysessionidt(sessionidt s)
1217 {
1218 if (!s || s >= MAXSESSION) return NULL;
1219 return &session[s];
1220 }
1221
1222 static sessionidt sessionidtbysessiont(sessiont *s)
1223 {
1224 sessionidt val = s-session;
1225 if (s < session || val >= MAXSESSION) return 0;
1226 return val;
1227 }
1228
1229 // actually send a control message for a specific tunnel
1230 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1231 {
1232 struct sockaddr_in addr;
1233
1234 CSTAT(tunnelsend);
1235
1236 if (!t)
1237 {
1238 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1239 STAT(tunnel_tx_errors);
1240 return;
1241 }
1242
1243 if (t == TUNNEL_ID_PPPOE)
1244 {
1245 pppoe_sess_send(buf, l, t);
1246 return;
1247 }
1248
1249 if (!tunnel[t].ip)
1250 {
1251 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1252 STAT(tunnel_tx_errors);
1253 return;
1254 }
1255
1256 memset(&addr, 0, sizeof(addr));
1257 addr.sin_family = AF_INET;
1258 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1259 addr.sin_port = htons(tunnel[t].port);
1260
1261 // sequence expected, if sequence in message
1262 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1263
1264 // If this is a control message, deal with retries
1265 if (*buf & 0x80)
1266 {
1267 tunnel[t].last = time_now; // control message sent
1268 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1269 if (tunnel[t].try)
1270 {
1271 STAT(tunnel_retries);
1272 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1273 }
1274 }
1275
1276 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1277 {
1278 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1279 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1280 STAT(tunnel_tx_errors);
1281 return;
1282 }
1283
1284 LOG_HEX(5, "Send Tunnel Data", buf, l);
1285 STAT(tunnel_tx_packets);
1286 INC_STAT(tunnel_tx_bytes, l);
1287 }
1288
1289 //
1290 // Tiny helper function to write data to
1291 // the 'tun' device.
1292 //
1293 int tun_write(uint8_t * data, int size)
1294 {
1295 return write(tunfd, data, size);
1296 }
1297
1298 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1299 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1300 {
1301 int d = (tcp[12] >> 4) * 4;
1302 uint8_t *mss = 0;
1303 uint8_t *opts;
1304 uint8_t *data;
1305 uint16_t orig;
1306 uint32_t sum;
1307
1308 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1309 return;
1310
1311 if (tcp + d > buf + len) // short?
1312 return;
1313
1314 opts = tcp + 20;
1315 data = tcp + d;
1316
1317 while (opts < data)
1318 {
1319 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1320 {
1321 mss = opts + 2;
1322 if (mss + 2 > data) return; // short?
1323 break;
1324 }
1325
1326 if (*opts == 0) return; // end of options
1327 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1328 opts++;
1329 else
1330 opts += opts[1]; // skip over option
1331 }
1332
1333 if (!mss) return; // not found
1334 orig = ntohs(*(uint16_t *) mss);
1335
1336 if (orig <= MSS) return; // mss OK
1337
1338 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1339 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1340 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1341 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1342
1343 // set mss
1344 *(int16_t *) mss = htons(MSS);
1345
1346 // adjust checksum (see rfc1141)
1347 sum = orig + (~MSS & 0xffff);
1348 sum += ntohs(*(uint16_t *) (tcp + 16));
1349 sum = (sum & 0xffff) + (sum >> 16);
1350 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1351 }
1352
1353 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1354 {
1355 uint16_t proto;
1356 if (extra) {
1357 // Skip the four extra bytes
1358 p += 4;
1359 l -= 4;
1360 }
1361
1362 if (*p & 1)
1363 {
1364 proto = *p++;
1365 l--;
1366 }
1367 else
1368 {
1369 proto = ntohs(*(uint16_t *) p);
1370 p += 2;
1371 l -= 2;
1372 }
1373 if (proto == PPPIP)
1374 {
1375 if (session[s].die)
1376 {
1377 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1378 return; // closing session, PPP not processed
1379 }
1380 session[s].last_packet = session[s].last_data = time_now;
1381 processipin(s, t, p, l);
1382 }
1383 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1384 {
1385 if (session[s].die)
1386 {
1387 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1388 return; // closing session, PPP not processed
1389 }
1390
1391 session[s].last_packet = session[s].last_data = time_now;
1392 processipv6in(s, t, p, l);
1393 }
1394 else if (proto == PPPIPCP)
1395 {
1396 session[s].last_packet = session[s].last_data = time_now;
1397 processipcp(s, t, p, l);
1398 }
1399 else if (proto == PPPCCP)
1400 {
1401 session[s].last_packet = session[s].last_data = time_now;
1402 processccp(s, t, p, l);
1403 }
1404 else
1405 {
1406 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1407 }
1408 }
1409
1410 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1411 {
1412 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1413 sp->cout_delta += len;
1414 sp->pout++;
1415 sp->last_data = time_now;
1416
1417 sess_local[s].cout += len; // To send to master..
1418 sess_local[s].pout++;
1419 }
1420
1421 // process outgoing (to tunnel) IP
1422 //
1423 // (i.e. this routine writes to data[-8]).
1424 void processipout(uint8_t *buf, int len)
1425 {
1426 sessionidt s;
1427 sessiont *sp;
1428 tunnelidt t;
1429 in_addr_t ip, ip_src;
1430
1431 uint8_t *data = buf; // Keep a copy of the originals.
1432 int size = len;
1433
1434 uint8_t fragbuf[MAXETHER + 20];
1435
1436 CSTAT(processipout);
1437
1438 if (len < MIN_IP_SIZE)
1439 {
1440 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1441 STAT(tun_rx_errors);
1442 return;
1443 }
1444 if (len >= MAXETHER)
1445 {
1446 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1447 STAT(tun_rx_errors);
1448 return;
1449 }
1450
1451 // Skip the tun header
1452 buf += 4;
1453 len -= 4;
1454
1455 // Got an IP header now
1456 if (*(uint8_t *)(buf) >> 4 != 4)
1457 {
1458 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1459 return;
1460 }
1461
1462 ip_src = *(uint32_t *)(buf + 12);
1463 ip = *(uint32_t *)(buf + 16);
1464 if (!(s = sessionbyip(ip)))
1465 {
1466 // Is this a packet for a session that doesn't exist?
1467 static int rate = 0; // Number of ICMP packets we've sent this second.
1468 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1469
1470 if (last != time_now)
1471 {
1472 last = time_now;
1473 rate = 0;
1474 }
1475
1476 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1477 {
1478 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1479 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1480 config->bind_address ? config->bind_address : my_address, buf, len);
1481 }
1482 return;
1483 }
1484
1485 t = session[s].tunnel;
1486 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1487 {
1488 LOG(3, s, t, "Packet size more than session MRU\n");
1489 return;
1490 }
1491
1492 sp = &session[s];
1493
1494 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1495 if (config->max_packets > 0)
1496 {
1497 if (sess_local[s].last_packet_out == TIME)
1498 {
1499 int max = config->max_packets;
1500
1501 // All packets for throttled sessions are handled by the
1502 // master, so further limit by using the throttle rate.
1503 // A bit of a kludge, since throttle rate is in kbps,
1504 // but should still be generous given our average DSL
1505 // packet size is 200 bytes: a limit of 28kbps equates
1506 // to around 180 packets per second.
1507 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1508 max = sp->throttle_out;
1509
1510 if (++sess_local[s].packets_out > max)
1511 {
1512 sess_local[s].packets_dropped++;
1513 return;
1514 }
1515 }
1516 else
1517 {
1518 if (sess_local[s].packets_dropped)
1519 {
1520 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1521 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1522 sess_local[s].packets_dropped, sess_local[s].packets_out,
1523 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1524 sp->user);
1525 }
1526
1527 sess_local[s].last_packet_out = TIME;
1528 sess_local[s].packets_out = 1;
1529 sess_local[s].packets_dropped = 0;
1530 }
1531 }
1532
1533 // run access-list if any
1534 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1535 return;
1536
1537 // adjust MSS on SYN and SYN,ACK packets with options
1538 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1539 {
1540 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1541 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1542 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1543 }
1544
1545 if (sp->tbf_out)
1546 {
1547 if (!config->no_throttle_local_IP || !sessionbyip(ip_src))
1548 {
1549 // Are we throttling this session?
1550 if (config->cluster_iam_master)
1551 tbf_queue_packet(sp->tbf_out, data, size);
1552 else
1553 master_throttle_packet(sp->tbf_out, data, size);
1554 return;
1555 }
1556 }
1557
1558 if (sp->walled_garden && !config->cluster_iam_master)
1559 {
1560 // We are walled-gardening this
1561 master_garden_packet(s, data, size);
1562 return;
1563 }
1564
1565 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1566 {
1567
1568 if (!config->cluster_iam_master)
1569 {
1570 // The MPPP packets must be managed by the Master.
1571 master_forward_mppp_packet(s, data, size);
1572 return;
1573 }
1574
1575 // Add on L2TP header
1576 sessionidt members[MAXBUNDLESES];
1577 bundleidt bid = session[s].bundle;
1578 bundlet *b = &bundle[bid];
1579 uint32_t num_of_links, nb_opened;
1580 int i;
1581
1582 num_of_links = b->num_of_links;
1583 nb_opened = 0;
1584 for (i = 0;i < num_of_links;i++)
1585 {
1586 s = b->members[i];
1587 if (session[s].ppp.lcp == Opened)
1588 {
1589 members[nb_opened] = s;
1590 nb_opened++;
1591 }
1592 }
1593
1594 if (nb_opened < 1)
1595 {
1596 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1597 return;
1598 }
1599
1600 num_of_links = nb_opened;
1601 b->current_ses = (b->current_ses + 1) % num_of_links;
1602 s = members[b->current_ses];
1603 t = session[s].tunnel;
1604 sp = &session[s];
1605 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1606
1607 if (num_of_links > 1)
1608 {
1609 if(len > MINFRAGLEN)
1610 {
1611 //for rotate traffic among the member links
1612 uint32_t divisor = num_of_links;
1613 if (divisor > 2)
1614 divisor = divisor/2 + (divisor & 1);
1615
1616 // Partition the packet to "num_of_links" fragments
1617 uint32_t fraglen = len / divisor;
1618 uint32_t last_fraglen = fraglen + len % divisor;
1619 uint32_t remain = len;
1620
1621 // send the first packet
1622 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1623 if (!p) return;
1624 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1625
1626 // statistics
1627 update_session_out_stat(s, sp, fraglen);
1628
1629 remain -= fraglen;
1630 while (remain > last_fraglen)
1631 {
1632 b->current_ses = (b->current_ses + 1) % num_of_links;
1633 s = members[b->current_ses];
1634 t = session[s].tunnel;
1635 sp = &session[s];
1636 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1637 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1638 if (!p) return;
1639 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1640 update_session_out_stat(s, sp, fraglen);
1641 remain -= fraglen;
1642 }
1643 // send the last fragment
1644 b->current_ses = (b->current_ses + 1) % num_of_links;
1645 s = members[b->current_ses];
1646 t = session[s].tunnel;
1647 sp = &session[s];
1648 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1649 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1650 if (!p) return;
1651 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1652 update_session_out_stat(s, sp, remain);
1653 if (remain != last_fraglen)
1654 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1655 }
1656 else
1657 {
1658 // Send it as one frame
1659 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1660 if (!p) return;
1661 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1662 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1663 update_session_out_stat(s, sp, len);
1664 }
1665 }
1666 else
1667 {
1668 // Send it as one frame (NO MPPP Frame)
1669 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1670 tunnelsend(p, len + (buf-p), t); // send it...
1671 update_session_out_stat(s, sp, len);
1672 }
1673 }
1674 else
1675 {
1676 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1677 tunnelsend(p, len + (buf-p), t); // send it...
1678 update_session_out_stat(s, sp, len);
1679 }
1680
1681 // Snooping this session, send it to intercept box
1682 if (sp->snoop_ip && sp->snoop_port)
1683 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1684
1685 udp_tx += len;
1686 }
1687
1688 // process outgoing (to tunnel) IPv6
1689 //
1690 static void processipv6out(uint8_t * buf, int len)
1691 {
1692 sessionidt s;
1693 sessiont *sp;
1694 tunnelidt t;
1695 in_addr_t ip;
1696 struct in6_addr ip6;
1697
1698 uint8_t *data = buf; // Keep a copy of the originals.
1699 int size = len;
1700
1701 uint8_t b[MAXETHER + 20];
1702
1703 CSTAT(processipv6out);
1704
1705 if (len < MIN_IP_SIZE)
1706 {
1707 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1708 STAT(tunnel_tx_errors);
1709 return;
1710 }
1711 if (len >= MAXETHER)
1712 {
1713 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1714 STAT(tunnel_tx_errors);
1715 return;
1716 }
1717
1718 // Skip the tun header
1719 buf += 4;
1720 len -= 4;
1721
1722 // Got an IP header now
1723 if (*(uint8_t *)(buf) >> 4 != 6)
1724 {
1725 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1726 return;
1727 }
1728
1729 ip6 = *(struct in6_addr *)(buf+24);
1730 s = sessionbyipv6(ip6);
1731
1732 if (s == 0)
1733 {
1734 ip = *(uint32_t *)(buf + 32);
1735 s = sessionbyip(ip);
1736 }
1737
1738 if (s == 0)
1739 {
1740 // Is this a packet for a session that doesn't exist?
1741 static int rate = 0; // Number of ICMP packets we've sent this second.
1742 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1743
1744 if (last != time_now)
1745 {
1746 last = time_now;
1747 rate = 0;
1748 }
1749
1750 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1751 {
1752 // FIXME: Should send icmp6 host unreachable
1753 }
1754 return;
1755 }
1756 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1757 {
1758 bundleidt bid = session[s].bundle;
1759 bundlet *b = &bundle[bid];
1760
1761 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1762 s = b->members[b->current_ses];
1763 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1764 }
1765 t = session[s].tunnel;
1766 sp = &session[s];
1767 sp->last_data = time_now;
1768
1769 // FIXME: add DoS prevention/filters?
1770
1771 if (sp->tbf_out)
1772 {
1773 // Are we throttling this session?
1774 if (config->cluster_iam_master)
1775 tbf_queue_packet(sp->tbf_out, data, size);
1776 else
1777 master_throttle_packet(sp->tbf_out, data, size);
1778 return;
1779 }
1780 else if (sp->walled_garden && !config->cluster_iam_master)
1781 {
1782 // We are walled-gardening this
1783 master_garden_packet(s, data, size);
1784 return;
1785 }
1786
1787 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1788
1789 // Add on L2TP header
1790 {
1791 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1792 if (!p) return;
1793 tunnelsend(b, len + (p-b), t); // send it...
1794 }
1795
1796 // Snooping this session, send it to intercept box
1797 if (sp->snoop_ip && sp->snoop_port)
1798 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1799
1800 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1801 sp->cout_delta += len;
1802 sp->pout++;
1803 udp_tx += len;
1804
1805 sess_local[s].cout += len; // To send to master..
1806 sess_local[s].pout++;
1807 }
1808
1809 //
1810 // Helper routine for the TBF filters.
1811 // Used to send queued data in to the user!
1812 //
1813 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1814 {
1815 sessiont *sp;
1816 tunnelidt t;
1817 uint8_t *p;
1818 uint8_t *data = buf; // Keep a copy of the originals.
1819
1820 uint8_t b[MAXETHER + 20];
1821
1822 if (len < 0 || len > MAXETHER)
1823 {
1824 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1825 return;
1826 }
1827
1828 // Skip the tun header
1829 buf += 4;
1830 len -= 4;
1831
1832 if (!session[s].ip)
1833 return;
1834
1835 t = session[s].tunnel;
1836 sp = &session[s];
1837
1838 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1839
1840 // Add on L2TP header
1841 if (*(uint16_t *) (data + 2) == htons(PKTIPV6))
1842 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0); // IPV6
1843 else
1844 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0); // IPV4
1845
1846 if (!p) return;
1847
1848 tunnelsend(b, len + (p-b), t); // send it...
1849
1850 // Snooping this session.
1851 if (sp->snoop_ip && sp->snoop_port)
1852 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1853
1854 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1855 sp->cout_delta += len;
1856 sp->pout++;
1857 udp_tx += len;
1858
1859 sess_local[s].cout += len; // To send to master..
1860 sess_local[s].pout++;
1861 }
1862
1863 // add an AVP (16 bit)
1864 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1865 {
1866 uint16_t l = (m ? 0x8008 : 0x0008);
1867 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1868 pint16[0] = htons(l);
1869 pint16[1] = htons(0);
1870 pint16[2] = htons(avp);
1871 pint16[3] = htons(val);
1872 c->length += 8;
1873 }
1874
1875 // add an AVP (32 bit)
1876 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1877 {
1878 uint16_t l = (m ? 0x800A : 0x000A);
1879 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1880 uint32_t *pint32 = (uint32_t *) (c->buf + c->length + 6);
1881 pint16[0] = htons(l);
1882 pint16[1] = htons(0);
1883 pint16[2] = htons(avp);
1884 pint32[0] = htonl(val);
1885 c->length += 10;
1886 }
1887
1888 // add an AVP (string)
1889 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1890 {
1891 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1892 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1893 pint16[0] = htons(l);
1894 pint16[1] = htons(0);
1895 pint16[2] = htons(avp);
1896 memcpy(c->buf + c->length + 6, val, strlen(val));
1897 c->length += 6 + strlen(val);
1898 }
1899
1900 // add a binary AVP
1901 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1902 {
1903 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1904 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1905 pint16[0] = htons(l);
1906 pint16[1] = htons(0);
1907 pint16[2] = htons(avp);
1908 memcpy(c->buf + c->length + 6, val, len);
1909 c->length += 6 + len;
1910 }
1911
1912 // new control connection
1913 static controlt *controlnew(uint16_t mtype)
1914 {
1915 controlt *c;
1916 if (!controlfree)
1917 c = malloc(sizeof(controlt));
1918 else
1919 {
1920 c = controlfree;
1921 controlfree = c->next;
1922 }
1923 assert(c);
1924 c->next = 0;
1925 c->buf[0] = 0xC8; // flags
1926 c->buf[1] = 0x02; // ver
1927 c->length = 12;
1928 control16(c, 0, mtype, 1);
1929 return c;
1930 }
1931
1932 // send zero block if nothing is waiting
1933 // (ZLB send).
1934 static void controlnull(tunnelidt t)
1935 {
1936 uint16_t buf[6];
1937 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1938 return;
1939
1940 buf[0] = htons(0xC802); // flags/ver
1941 buf[1] = htons(12); // length
1942 buf[2] = htons(tunnel[t].far); // tunnel
1943 buf[3] = htons(0); // session
1944 buf[4] = htons(tunnel[t].ns); // sequence
1945 buf[5] = htons(tunnel[t].nr); // sequence
1946 tunnelsend((uint8_t *)buf, 12, t);
1947 }
1948
1949 // add a control message to a tunnel, and send if within window
1950 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1951 {
1952 uint16_t *pint16 = (uint16_t *) (c->buf + 2);
1953 pint16[0] = htons(c->length); // length
1954 pint16[1] = htons(tunnel[t].far); // tunnel
1955 pint16[2] = htons(far); // session
1956 pint16[3] = htons(tunnel[t].ns); // sequence
1957 tunnel[t].ns++; // advance sequence
1958 // link in message in to queue
1959 if (tunnel[t].controlc)
1960 tunnel[t].controle->next = c;
1961 else
1962 tunnel[t].controls = c;
1963
1964 tunnel[t].controle = c;
1965 tunnel[t].controlc++;
1966
1967 // send now if space in window
1968 if (tunnel[t].controlc <= tunnel[t].window)
1969 {
1970 tunnel[t].try = 0; // first send
1971 tunnelsend(c->buf, c->length, t);
1972 }
1973 }
1974
1975 //
1976 // Throttle or Unthrottle a session
1977 //
1978 // Throttle the data from/to through a session to no more than
1979 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1980 // user).
1981 //
1982 // If either value is -1, the current value is retained for that
1983 // direction.
1984 //
1985 void throttle_session(sessionidt s, int rate_in, int rate_out)
1986 {
1987 if (!session[s].opened)
1988 return; // No-one home.
1989
1990 if (!*session[s].user)
1991 return; // User not logged in
1992
1993 if (rate_in >= 0)
1994 {
1995 int bytes = rate_in * 1024 / 8; // kbits to bytes
1996 if (session[s].tbf_in)
1997 free_tbf(session[s].tbf_in);
1998
1999 if (rate_in > 0)
2000 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
2001 else
2002 session[s].tbf_in = 0;
2003
2004 session[s].throttle_in = rate_in;
2005 }
2006
2007 if (rate_out >= 0)
2008 {
2009 int bytes = rate_out * 1024 / 8;
2010 if (session[s].tbf_out)
2011 free_tbf(session[s].tbf_out);
2012
2013 if (rate_out > 0)
2014 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
2015 else
2016 session[s].tbf_out = 0;
2017
2018 session[s].throttle_out = rate_out;
2019 }
2020 }
2021
2022 // add/remove filters from session (-1 = no change)
2023 void filter_session(sessionidt s, int filter_in, int filter_out)
2024 {
2025 if (!session[s].opened)
2026 return; // No-one home.
2027
2028 if (!*session[s].user)
2029 return; // User not logged in
2030
2031 // paranoia
2032 if (filter_in > MAXFILTER) filter_in = -1;
2033 if (filter_out > MAXFILTER) filter_out = -1;
2034 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2035 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2036
2037 if (filter_in >= 0)
2038 {
2039 if (session[s].filter_in)
2040 ip_filters[session[s].filter_in - 1].used--;
2041
2042 if (filter_in > 0)
2043 ip_filters[filter_in - 1].used++;
2044
2045 session[s].filter_in = filter_in;
2046 }
2047
2048 if (filter_out >= 0)
2049 {
2050 if (session[s].filter_out)
2051 ip_filters[session[s].filter_out - 1].used--;
2052
2053 if (filter_out > 0)
2054 ip_filters[filter_out - 1].used++;
2055
2056 session[s].filter_out = filter_out;
2057 }
2058 }
2059
2060 // start tidy shutdown of session
2061 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2062 {
2063 int walled_garden = session[s].walled_garden;
2064 bundleidt b = session[s].bundle;
2065 //delete routes only for last session in bundle (in case of MPPP)
2066 int del_routes = !b || (bundle[b].num_of_links == 1);
2067
2068 CSTAT(sessionshutdown);
2069
2070 if (!session[s].opened)
2071 {
2072 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2073 return; // not a live session
2074 }
2075
2076 if (!session[s].die)
2077 {
2078 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2079 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2080 run_plugins(PLUGIN_KILL_SESSION, &data);
2081 }
2082
2083 if (session[s].ip && !walled_garden && !session[s].die)
2084 {
2085 // RADIUS Stop message
2086 uint16_t r = radiusnew(s);
2087 if (r)
2088 {
2089 // stop, if not already trying
2090 if (radius[r].state != RADIUSSTOP)
2091 {
2092 radius[r].term_cause = term_cause;
2093 radius[r].term_msg = reason;
2094 radiussend(r, RADIUSSTOP);
2095 }
2096 }
2097 else
2098 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2099
2100 // Save counters to dump to accounting file
2101 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2102 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2103 }
2104
2105 if (!session[s].die)
2106 session[s].die = TIME + 150; // Clean up in 15 seconds
2107
2108 if (session[s].ip)
2109 { // IP allocated, clear and unroute
2110 int r;
2111 int routed = 0;
2112 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2113 {
2114 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2115 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2116 routed++;
2117
2118 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2119 session[s].route[r].ip = 0;
2120 }
2121
2122 if (session[s].ip_pool_index == -1) // static ip
2123 {
2124 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2125 session[s].ip = 0;
2126 }
2127 else
2128 free_ip_address(s);
2129
2130 // unroute IPv6, if setup
2131 if (session[s].ipv6route.s6_addr[0] && session[s].ipv6prefixlen && del_routes)
2132 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2133
2134 if (session[s].ipv6address.s6_addr[0] && del_routes)
2135 {
2136 route6set(s, session[s].ipv6address, 128, 0);
2137 }
2138
2139 if (b)
2140 {
2141 // This session was part of a bundle
2142 bundle[b].num_of_links--;
2143 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2144 if(bundle[b].num_of_links == 0)
2145 {
2146 bundleclear(b);
2147 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2148 }
2149 else
2150 {
2151 // Adjust the members array to accomodate the new change
2152 uint8_t mem_num = 0;
2153 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2154 if(bundle[b].members[bundle[b].num_of_links] != s)
2155 {
2156 uint8_t ml;
2157 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2158 if(bundle[b].members[ml] == s)
2159 {
2160 mem_num = ml;
2161 break;
2162 }
2163 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2164 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2165
2166 // If the killed session is the first of the bundle,
2167 // the new first session must be stored in the cache_ipmap
2168 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2169 if (mem_num == 0)
2170 {
2171 sessionidt new_s = bundle[b].members[0];
2172
2173 routed = 0;
2174 // Add the route for this session.
2175 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2176 {
2177 int i, prefixlen;
2178 in_addr_t ip;
2179
2180 prefixlen = session[new_s].route[r].prefixlen;
2181 ip = session[new_s].route[r].ip;
2182
2183 if (!prefixlen) prefixlen = 32;
2184 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2185
2186 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2187 cache_ipmap(i, new_s);
2188 }
2189 cache_ipmap(session[new_s].ip, new_s);
2190
2191 // IPV6 route
2192 if (session[new_s].ipv6prefixlen)
2193 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2194
2195 if (session[new_s].ipv6address.s6_addr[0])
2196 {
2197 cache_ipv6map(session[new_s].ipv6address, 128, new_s);
2198 }
2199 }
2200 }
2201 }
2202
2203 cluster_send_bundle(b);
2204 }
2205 }
2206
2207 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2208 throttle_session(s, 0, 0);
2209
2210 if (cdn_result)
2211 {
2212 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2213 {
2214 pppoe_shutdown_session(s);
2215 }
2216 else
2217 {
2218 // Send CDN
2219 controlt *c = controlnew(14); // sending CDN
2220 if (cdn_error)
2221 {
2222 uint16_t buf[2];
2223 buf[0] = htons(cdn_result);
2224 buf[1] = htons(cdn_error);
2225 controlb(c, 1, (uint8_t *)buf, 4, 1);
2226 }
2227 else
2228 control16(c, 1, cdn_result, 1);
2229
2230 control16(c, 14, s, 1); // assigned session (our end)
2231 controladd(c, session[s].far, session[s].tunnel); // send the message
2232 }
2233 }
2234
2235 // update filter refcounts
2236 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2237 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2238
2239 // clear PPP state
2240 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2241 sess_local[s].lcp.restart = 0;
2242 sess_local[s].ipcp.restart = 0;
2243 sess_local[s].ipv6cp.restart = 0;
2244 sess_local[s].ccp.restart = 0;
2245
2246 cluster_send_session(s);
2247 }
2248
2249 void sendipcp(sessionidt s, tunnelidt t)
2250 {
2251 uint8_t buf[MAXETHER];
2252 uint8_t *q;
2253
2254 CSTAT(sendipcp);
2255 LOG(3, s, t, "IPCP: send ConfigReq\n");
2256
2257 if (!session[s].unique_id)
2258 {
2259 if (!++last_id) ++last_id; // skip zero
2260 session[s].unique_id = last_id;
2261 }
2262
2263 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2264 if (!q) return;
2265
2266 *q = ConfigReq;
2267 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2268 *(uint16_t *) (q + 2) = htons(10); // packet length
2269 q[4] = 3; // ip address option
2270 q[5] = 6; // option length
2271 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2272 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2273 my_address; // send my IP
2274
2275 tunnelsend(buf, 10 + (q - buf), t); // send it
2276 restart_timer(s, ipcp);
2277 }
2278
2279 void sendipv6cp(sessionidt s, tunnelidt t)
2280 {
2281 uint8_t buf[MAXETHER];
2282 uint8_t *q;
2283
2284 CSTAT(sendipv6cp);
2285 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2286
2287 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2288 if (!q) return;
2289
2290 *q = ConfigReq;
2291 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2292 // only send one type
2293 // of request
2294 *(uint16_t *) (q + 2) = htons(14);
2295 q[4] = 1; // interface identifier option
2296 q[5] = 10; // option length
2297 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2298 *(uint32_t *) (q + 10) = 0;
2299 q[13] = 1;
2300
2301 tunnelsend(buf, 14 + (q - buf), t); // send it
2302 restart_timer(s, ipv6cp);
2303 }
2304
2305 static void sessionclear(sessionidt s)
2306 {
2307 memset(&session[s], 0, sizeof(session[s]));
2308 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2309 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2310
2311 session[s].tunnel = T_FREE; // Mark it as free.
2312 session[s].next = sessionfree;
2313 sessionfree = s;
2314 }
2315
2316 // kill a session now
2317 void sessionkill(sessionidt s, char *reason)
2318 {
2319 CSTAT(sessionkill);
2320
2321 if (!session[s].opened) // not alive
2322 return;
2323
2324 if (session[s].next)
2325 {
2326 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2327 return;
2328 }
2329
2330 if (!session[s].die)
2331 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2332
2333 if (sess_local[s].radius)
2334 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2335
2336 if (session[s].forwardtosession)
2337 {
2338 sessionidt sess = session[s].forwardtosession;
2339 if (session[sess].forwardtosession == s)
2340 {
2341 // Shutdown the linked session also.
2342 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2343 }
2344 }
2345
2346 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2347 sessionclear(s);
2348 cluster_send_session(s);
2349 }
2350
2351 static void tunnelclear(tunnelidt t)
2352 {
2353 if (!t) return;
2354 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2355 tunnel[t].state = TUNNELFREE;
2356 }
2357
2358 static void bundleclear(bundleidt b)
2359 {
2360 if (!b) return;
2361 memset(&bundle[b], 0, sizeof(bundle[b]));
2362 bundle[b].state = BUNDLEFREE;
2363 }
2364
2365 // kill a tunnel now
2366 static void tunnelkill(tunnelidt t, char *reason)
2367 {
2368 sessionidt s;
2369 controlt *c;
2370
2371 CSTAT(tunnelkill);
2372
2373 tunnel[t].state = TUNNELDIE;
2374
2375 // free control messages
2376 while ((c = tunnel[t].controls))
2377 {
2378 controlt * n = c->next;
2379 tunnel[t].controls = n;
2380 tunnel[t].controlc--;
2381 c->next = controlfree;
2382 controlfree = c;
2383 }
2384 // kill sessions
2385 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2386 if (session[s].tunnel == t)
2387 sessionkill(s, reason);
2388
2389 // free tunnel
2390 tunnelclear(t);
2391 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2392 cli_tunnel_actions[t].action = 0;
2393 cluster_send_tunnel(t);
2394 }
2395
2396 // shut down a tunnel cleanly
2397 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2398 {
2399 sessionidt s;
2400
2401 CSTAT(tunnelshutdown);
2402
2403 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2404 {
2405 // never set up, can immediately kill
2406 tunnelkill(t, reason);
2407 return;
2408 }
2409 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2410
2411 // close session
2412 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2413 if (session[s].tunnel == t)
2414 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2415
2416 tunnel[t].state = TUNNELDIE;
2417 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2418 cluster_send_tunnel(t);
2419 // TBA - should we wait for sessions to stop?
2420 if (result)
2421 {
2422 controlt *c = controlnew(4); // sending StopCCN
2423 if (error)
2424 {
2425 uint16_t buf[32];
2426 int l = 4;
2427 buf[0] = htons(result);
2428 buf[1] = htons(error);
2429 if (msg)
2430 {
2431 int m = strlen(msg);
2432 if (m + 4 > sizeof(buf))
2433 m = sizeof(buf) - 4;
2434
2435 memcpy(buf+2, msg, m);
2436 l += m;
2437 }
2438
2439 controlb(c, 1, (uint8_t *)buf, l, 1);
2440 }
2441 else
2442 control16(c, 1, result, 1);
2443
2444 control16(c, 9, t, 1); // assigned tunnel (our end)
2445 controladd(c, 0, t); // send the message
2446 }
2447 }
2448
2449 // read and process packet on tunnel (UDP)
2450 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2451 {
2452 uint8_t *sendchalresponse = NULL;
2453 uint8_t *recvchalresponse = NULL;
2454 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2455 uint8_t *p = buf + 2;
2456
2457
2458 CSTAT(processudp);
2459
2460 udp_rx += len;
2461 udp_rx_pkt++;
2462 LOG_HEX(5, "UDP Data", buf, len);
2463 STAT(tunnel_rx_packets);
2464 INC_STAT(tunnel_rx_bytes, len);
2465 if (len < 6)
2466 {
2467 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2468 STAT(tunnel_rx_errors);
2469 return;
2470 }
2471 if ((buf[1] & 0x0F) != 2)
2472 {
2473 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2474 STAT(tunnel_rx_errors);
2475 return;
2476 }
2477 if (*buf & 0x40)
2478 { // length
2479 l = ntohs(*(uint16_t *) p);
2480 p += 2;
2481 }
2482 t = ntohs(*(uint16_t *) p);
2483 p += 2;
2484 s = ntohs(*(uint16_t *) p);
2485 p += 2;
2486 if (s >= MAXSESSION)
2487 {
2488 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2489 STAT(tunnel_rx_errors);
2490 return;
2491 }
2492 if (t >= MAXTUNNEL)
2493 {
2494 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2495 STAT(tunnel_rx_errors);
2496 return;
2497 }
2498 if (t == TUNNEL_ID_PPPOE)
2499 {
2500 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2501 STAT(tunnel_rx_errors);
2502 return;
2503 }
2504 if (*buf & 0x08)
2505 { // ns/nr
2506 ns = ntohs(*(uint16_t *) p);
2507 p += 2;
2508 nr = ntohs(*(uint16_t *) p);
2509 p += 2;
2510 }
2511 if (*buf & 0x02)
2512 { // offset
2513 uint16_t o = ntohs(*(uint16_t *) p);
2514 p += o + 2;
2515 }
2516 if ((p - buf) > l)
2517 {
2518 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2519 STAT(tunnel_rx_errors);
2520 return;
2521 }
2522 l -= (p - buf);
2523
2524 // used to time out old tunnels
2525 if (t && tunnel[t].state == TUNNELOPEN)
2526 tunnel[t].lastrec = time_now;
2527
2528 if (*buf & 0x80)
2529 { // control
2530 uint16_t message = 0xFFFF; // message type
2531 uint8_t fatal = 0;
2532 uint8_t mandatory = 0;
2533 uint16_t asession = 0; // assigned session
2534 uint32_t amagic = 0; // magic number
2535 uint8_t aflags = 0; // flags from last LCF
2536 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2537 char called[MAXTEL] = ""; // called number
2538 char calling[MAXTEL] = ""; // calling number
2539
2540 if (!config->cluster_iam_master)
2541 {
2542 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2543 return;
2544 }
2545
2546 // control messages must have bits 0x80|0x40|0x08
2547 // (type, length and sequence) set, and bits 0x02|0x01
2548 // (offset and priority) clear
2549 if ((*buf & 0xCB) != 0xC8)
2550 {
2551 LOG(1, s, t, "Bad control header %02X\n", *buf);
2552 STAT(tunnel_rx_errors);
2553 return;
2554 }
2555
2556 // check for duplicate tunnel open message
2557 if (!t && ns == 0)
2558 {
2559 int i;
2560
2561 //
2562 // Is this a duplicate of the first packet? (SCCRQ)
2563 //
2564 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2565 {
2566 if (tunnel[i].state != TUNNELOPENING ||
2567 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2568 tunnel[i].port != ntohs(addr->sin_port) )
2569 continue;
2570 t = i;
2571 LOG(3, s, t, "Duplicate SCCRQ?\n");
2572 break;
2573 }
2574 }
2575
2576 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2577 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2578
2579 // if no tunnel specified, assign one
2580 if (!t)
2581 {
2582 if (!(t = new_tunnel()))
2583 {
2584 LOG(1, 0, 0, "No more tunnels\n");
2585 STAT(tunnel_overflow);
2586 return;
2587 }
2588 tunnelclear(t);
2589 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2590 tunnel[t].port = ntohs(addr->sin_port);
2591 tunnel[t].window = 4; // default window
2592 tunnel[t].indexudp = indexudpfd;
2593 STAT(tunnel_created);
2594 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2595 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2596 }
2597
2598 // If the 'ns' just received is not the 'nr' we're
2599 // expecting, just send an ack and drop it.
2600 //
2601 // if 'ns' is less, then we got a retransmitted packet.
2602 // if 'ns' is greater than missed a packet. Either way
2603 // we should ignore it.
2604 if (ns != tunnel[t].nr)
2605 {
2606 // is this the sequence we were expecting?
2607 STAT(tunnel_rx_errors);
2608 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2609 t, ns, tunnel[t].nr);
2610
2611 if (l) // Is this not a ZLB?
2612 controlnull(t);
2613 return;
2614 }
2615
2616 // check sequence of this message
2617 {
2618 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2619 // some to clear maybe?
2620 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2621 {
2622 controlt *c = tunnel[t].controls;
2623 tunnel[t].controls = c->next;
2624 tunnel[t].controlc--;
2625 c->next = controlfree;
2626 controlfree = c;
2627 skip--;
2628 tunnel[t].try = 0; // we have progress
2629 }
2630
2631 // receiver advance (do here so quoted correctly in any sends below)
2632 if (l) tunnel[t].nr = (ns + 1);
2633 if (skip < 0) skip = 0;
2634 if (skip < tunnel[t].controlc)
2635 {
2636 // some control packets can now be sent that were previous stuck out of window
2637 int tosend = tunnel[t].window - skip;
2638 controlt *c = tunnel[t].controls;
2639 while (c && skip)
2640 {
2641 c = c->next;
2642 skip--;
2643 }
2644 while (c && tosend)
2645 {
2646 tunnel[t].try = 0; // first send
2647 tunnelsend(c->buf, c->length, t);
2648 c = c->next;
2649 tosend--;
2650 }
2651 }
2652 if (!tunnel[t].controlc)
2653 tunnel[t].retry = 0; // caught up
2654 }
2655 if (l)
2656 { // if not a null message
2657 int result = 0;
2658 int error = 0;
2659 char *msg = 0;
2660
2661 // Default disconnect cause/message on receipt of CDN. Set to
2662 // more specific value from attribute 1 (result code) or 46
2663 // (disconnect cause) if present below.
2664 int disc_cause_set = 0;
2665 int disc_cause = TERM_NAS_REQUEST;
2666 char const *disc_reason = "Closed (Received CDN).";
2667
2668 // process AVPs
2669 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2670 {
2671 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2672 uint8_t *b = p;
2673 uint8_t flags = *p;
2674 uint16_t mtype;
2675
2676 if (n > l)
2677 {
2678 LOG(1, s, t, "Invalid length in AVP\n");
2679 STAT(tunnel_rx_errors);
2680 return;
2681 }
2682 p += n; // next
2683 l -= n;
2684 if (flags & 0x3C) // reserved bits, should be clear
2685 {
2686 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2687 fatal = flags;
2688 result = 2; // general error
2689 error = 3; // reserved field non-zero
2690 msg = 0;
2691 continue; // next
2692 }
2693 b += 2;
2694 if (*(uint16_t *) (b))
2695 {
2696 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2697 fatal = flags;
2698 result = 2; // general error
2699 error = 6; // generic vendor-specific error
2700 msg = "unsupported vendor-specific";
2701 continue; // next
2702 }
2703 b += 2;
2704 mtype = ntohs(*(uint16_t *) (b));
2705 b += 2;
2706 n -= 6;
2707
2708 if (flags & 0x40)
2709 {
2710 uint16_t orig_len;
2711
2712 // handle hidden AVPs
2713 if (!*config->l2tp_secret)
2714 {
2715 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2716 fatal = flags;
2717 result = 2; // general error
2718 error = 6; // generic vendor-specific error
2719 msg = "secret not specified";
2720 continue;
2721 }
2722 if (!session[s].random_vector_length)
2723 {
2724 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2725 fatal = flags;
2726 result = 2; // general error
2727 error = 6; // generic
2728 msg = "no random vector";
2729 continue;
2730 }
2731 if (n < 8)
2732 {
2733 LOG(2, s, t, "Short hidden AVP.\n");
2734 fatal = flags;
2735 result = 2; // general error
2736 error = 2; // length is wrong
2737 msg = 0;
2738 continue;
2739 }
2740
2741 // Unhide the AVP
2742 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2743
2744 orig_len = ntohs(*(uint16_t *) b);
2745 if (orig_len > n + 2)
2746 {
2747 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2748 orig_len, n);
2749
2750 fatal = flags;
2751 result = 2; // general error
2752 error = 2; // length is wrong
2753 msg = 0;
2754 continue;
2755 }
2756
2757 b += 2;
2758 n = orig_len;
2759 }
2760
2761 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2762 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2763
2764 switch (mtype)
2765 {
2766 case 0: // message type
2767 message = ntohs(*(uint16_t *) b);
2768 mandatory = flags & 0x80;
2769 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2770 break;
2771 case 1: // result code
2772 {
2773 uint16_t rescode = ntohs(*(uint16_t *) b);
2774 char const *resdesc = "(unknown)";
2775 char const *errdesc = NULL;
2776 int cause = 0;
2777
2778 if (message == 4)
2779 { /* StopCCN */
2780 resdesc = l2tp_stopccn_result_code(rescode);
2781 cause = TERM_LOST_SERVICE;
2782 }
2783 else if (message == 14)
2784 { /* CDN */
2785 resdesc = l2tp_cdn_result_code(rescode);
2786 if (rescode == 1)
2787 cause = TERM_LOST_CARRIER;
2788 else
2789 cause = TERM_ADMIN_RESET;
2790 }
2791
2792 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2793 if (n >= 4)
2794 {
2795 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2796 errdesc = l2tp_error_code(errcode);
2797 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2798 }
2799 if (n > 4)
2800 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2801
2802 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2803 {
2804 disc_cause_set = mtype;
2805 disc_reason = errdesc ? errdesc : resdesc;
2806 disc_cause = cause;
2807 }
2808
2809 break;
2810 }
2811 break;
2812 case 2: // protocol version
2813 {
2814 version = ntohs(*(uint16_t *) (b));
2815 LOG(4, s, t, " Protocol version = %u\n", version);
2816 if (version && version != 0x0100)
2817 { // allow 0.0 and 1.0
2818 LOG(1, s, t, " Bad protocol version %04X\n", version);
2819 fatal = flags;
2820 result = 5; // unspported protocol version
2821 error = 0x0100; // supported version
2822 msg = 0;
2823 continue; // next
2824 }
2825 }
2826 break;
2827 case 3: // framing capabilities
2828 break;
2829 case 4: // bearer capabilities
2830 break;
2831 case 5: // tie breaker
2832 // We never open tunnels, so we don't care about tie breakers
2833 continue;
2834 case 6: // firmware revision
2835 break;
2836 case 7: // host name
2837 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2838 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2839 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2840 // TBA - to send to RADIUS
2841 break;
2842 case 8: // vendor name
2843 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2844 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2845 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2846 break;
2847 case 9: // assigned tunnel
2848 tunnel[t].far = ntohs(*(uint16_t *) (b));
2849 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2850 break;
2851 case 10: // rx window
2852 tunnel[t].window = ntohs(*(uint16_t *) (b));
2853 if (!tunnel[t].window)
2854 tunnel[t].window = 1; // window of 0 is silly
2855 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2856 break;
2857 case 11: // Request Challenge
2858 {
2859 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2860 if (message == 1)
2861 build_chap_response(b, 2, n, &sendchalresponse);
2862 else if (message == 2)
2863 build_chap_response(b, 3, n, &sendchalresponse);
2864 }
2865 break;
2866 case 13: // receive challenge Response
2867 if (tunnel[t].isremotelns)
2868 {
2869 recvchalresponse = calloc(17, 1);
2870 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2871 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2872 }
2873 else
2874 // Why did they send a response? We never challenge.
2875 LOG(2, s, t, " received unexpected challenge response\n");
2876 break;
2877
2878 case 14: // assigned session
2879 asession = session[s].far = ntohs(*(uint16_t *) (b));
2880 LOG(4, s, t, " assigned session = %u\n", asession);
2881 break;
2882 case 15: // call serial number
2883 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2884 break;
2885 case 18: // bearer type
2886 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2887 // TBA - for RADIUS
2888 break;
2889 case 19: // framing type
2890 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2891 // TBA
2892 break;
2893 case 21: // called number
2894 memset(called, 0, sizeof(called));
2895 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2896 LOG(4, s, t, " Called <%s>\n", called);
2897 break;
2898 case 22: // calling number
2899 memset(calling, 0, sizeof(calling));
2900 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2901 LOG(4, s, t, " Calling <%s>\n", calling);
2902 break;
2903 case 23: // subtype
2904 break;
2905 case 24: // tx connect speed
2906 if (n == 4)
2907 {
2908 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2909 }
2910 else
2911 {
2912 // AS5300s send connect speed as a string
2913 char tmp[30];
2914 memset(tmp, 0, sizeof(tmp));
2915 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2916 session[s].tx_connect_speed = atol(tmp);
2917 }
2918 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2919 break;
2920 case 38: // rx connect speed
2921 if (n == 4)
2922 {
2923 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2924 }
2925 else
2926 {
2927 // AS5300s send connect speed as a string
2928 char tmp[30];
2929 memset(tmp, 0, sizeof(tmp));
2930 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2931 session[s].rx_connect_speed = atol(tmp);
2932 }
2933 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2934 break;
2935 case 25: // Physical Channel ID
2936 {
2937 uint32_t tmp = ntohl(*(uint32_t *) b);
2938 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2939 break;
2940 }
2941 case 29: // Proxy Authentication Type
2942 {
2943 uint16_t atype = ntohs(*(uint16_t *)b);
2944 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2945 break;
2946 }
2947 case 30: // Proxy Authentication Name
2948 {
2949 char authname[64];
2950 memset(authname, 0, sizeof(authname));
2951 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2952 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2953 authname);
2954 break;
2955 }
2956 case 31: // Proxy Authentication Challenge
2957 {
2958 LOG(4, s, t, " Proxy Auth Challenge\n");
2959 break;
2960 }
2961 case 32: // Proxy Authentication ID
2962 {
2963 uint16_t authid = ntohs(*(uint16_t *)(b));
2964 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2965 break;
2966 }
2967 case 33: // Proxy Authentication Response
2968 LOG(4, s, t, " Proxy Auth Response\n");
2969 break;
2970 case 27: // last sent lcp
2971 { // find magic number
2972 uint8_t *p = b, *e = p + n;
2973 while (p + 1 < e && p[1] && p + p[1] <= e)
2974 {
2975 if (*p == 5 && p[1] == 6) // Magic-Number
2976 amagic = ntohl(*(uint32_t *) (p + 2));
2977 else if (*p == 7) // Protocol-Field-Compression
2978 aflags |= SESSION_PFC;
2979 else if (*p == 8) // Address-and-Control-Field-Compression
2980 aflags |= SESSION_ACFC;
2981 p += p[1];
2982 }
2983 }
2984 break;
2985 case 28: // last recv lcp confreq
2986 break;
2987 case 26: // Initial Received LCP CONFREQ
2988 break;
2989 case 39: // seq required - we control it as an LNS anyway...
2990 break;
2991 case 36: // Random Vector
2992 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2993 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2994 if (n > sizeof(session[s].random_vector))
2995 n = sizeof(session[s].random_vector);
2996 memcpy(session[s].random_vector, b, n);
2997 session[s].random_vector_length = n;
2998 break;
2999 case 46: // ppp disconnect cause
3000 if (n >= 5)
3001 {
3002 uint16_t code = ntohs(*(uint16_t *) b);
3003 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
3004 uint8_t dir = *(b + 4);
3005
3006 LOG(4, s, t, " PPP disconnect cause "
3007 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3008 code, proto, dir, n - 5, b + 5);
3009
3010 disc_cause_set = mtype;
3011
3012 switch (code)
3013 {
3014 case 1: // admin disconnect
3015 disc_cause = TERM_ADMIN_RESET;
3016 disc_reason = "Administrative disconnect";
3017 break;
3018 case 3: // lcp terminate
3019 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
3020 disc_cause = TERM_USER_REQUEST;
3021 disc_reason = "Normal disconnection";
3022 break;
3023 case 4: // compulsory encryption unavailable
3024 if (dir != 1) break; // 1=refused by peer, 2=local
3025 disc_cause = TERM_USER_ERROR;
3026 disc_reason = "Compulsory encryption refused";
3027 break;
3028 case 5: // lcp: fsm timeout
3029 disc_cause = TERM_PORT_ERROR;
3030 disc_reason = "LCP: FSM timeout";
3031 break;
3032 case 6: // lcp: no recognisable lcp packets received
3033 disc_cause = TERM_PORT_ERROR;
3034 disc_reason = "LCP: no recognisable LCP packets";
3035 break;
3036 case 7: // lcp: magic-no error (possibly looped back)
3037 disc_cause = TERM_PORT_ERROR;
3038 disc_reason = "LCP: magic-no error (possible loop)";
3039 break;
3040 case 8: // lcp: echo request timeout
3041 disc_cause = TERM_PORT_ERROR;
3042 disc_reason = "LCP: echo request timeout";
3043 break;
3044 case 13: // auth: fsm timeout
3045 disc_cause = TERM_SERVICE_UNAVAILABLE;
3046 disc_reason = "Authentication: FSM timeout";
3047 break;
3048 case 15: // auth: unacceptable auth protocol
3049 disc_cause = TERM_SERVICE_UNAVAILABLE;
3050 disc_reason = "Unacceptable authentication protocol";
3051 break;
3052 case 16: // auth: authentication failed
3053 disc_cause = TERM_SERVICE_UNAVAILABLE;
3054 disc_reason = "Authentication failed";
3055 break;
3056 case 17: // ncp: fsm timeout
3057 disc_cause = TERM_SERVICE_UNAVAILABLE;
3058 disc_reason = "NCP: FSM timeout";
3059 break;
3060 case 18: // ncp: no ncps available
3061 disc_cause = TERM_SERVICE_UNAVAILABLE;
3062 disc_reason = "NCP: no NCPs available";
3063 break;
3064 case 19: // ncp: failure to converge on acceptable address
3065 disc_cause = TERM_SERVICE_UNAVAILABLE;
3066 disc_reason = (dir == 1)
3067 ? "NCP: too many Configure-Naks received from peer"
3068 : "NCP: too many Configure-Naks sent to peer";
3069 break;
3070 case 20: // ncp: user not permitted to use any address
3071 disc_cause = TERM_SERVICE_UNAVAILABLE;
3072 disc_reason = (dir == 1)
3073 ? "NCP: local link address not acceptable to peer"
3074 : "NCP: remote link address not acceptable";
3075 break;
3076 }
3077 }
3078 break;
3079 default:
3080 {
3081 static char e[] = "unknown AVP 0xXXXX";
3082 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3083 fatal = flags;
3084 result = 2; // general error
3085 error = 8; // unknown mandatory AVP
3086 sprintf((msg = e) + 14, "%04x", mtype);
3087 continue; // next
3088 }
3089 }
3090 }
3091 // process message
3092 if (fatal & 0x80)
3093 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3094 else
3095 switch (message)
3096 {
3097 case 1: // SCCRQ - Start Control Connection Request
3098 tunnel[t].state = TUNNELOPENING;
3099 LOG(3, s, t, "Received SCCRQ\n");
3100 if (main_quit != QUIT_SHUTDOWN)
3101 {
3102 LOG(3, s, t, "sending SCCRP\n");
3103 controlt *c = controlnew(2); // sending SCCRP
3104 control16(c, 2, version, 1); // protocol version
3105 control32(c, 3, 3, 1); // framing
3106 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3107 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3108 control16(c, 9, t, 1); // assigned tunnel
3109 controladd(c, 0, t); // send the resply
3110 }
3111 else
3112 {
3113 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3114 }
3115 break;
3116 case 2: // SCCRP
3117 tunnel[t].state = TUNNELOPEN;
3118 tunnel[t].lastrec = time_now;
3119 LOG(3, s, t, "Received SCCRP\n");
3120 if (main_quit != QUIT_SHUTDOWN)
3121 {
3122 if (tunnel[t].isremotelns && recvchalresponse)
3123 {
3124 hasht hash;
3125
3126 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3127 // check authenticator
3128 if (memcmp(hash, recvchalresponse, 16) == 0)
3129 {
3130 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3131 controlt *c = controlnew(3); // sending SCCCN
3132 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3133 controls(c, 8, Vendor_name, 1); // Vendor name
3134 control16(c, 2, version, 1); // protocol version
3135 control32(c, 3, 3, 1); // framing Capabilities
3136 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3137 control16(c, 9, t, 1); // assigned tunnel
3138 controladd(c, 0, t); // send
3139 }
3140 else
3141 {
3142 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3143 }
3144 }
3145 }
3146 else
3147 {
3148 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3149 }
3150 break;
3151 case 3: // SCCN
3152 LOG(3, s, t, "Received SCCN\n");
3153 tunnel[t].state = TUNNELOPEN;
3154 tunnel[t].lastrec = time_now;
3155 controlnull(t); // ack
3156 break;
3157 case 4: // StopCCN
3158 LOG(3, s, t, "Received StopCCN\n");
3159 controlnull(t); // ack
3160 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3161 break;
3162 case 6: // HELLO
3163 LOG(3, s, t, "Received HELLO\n");
3164 controlnull(t); // simply ACK
3165 break;
3166 case 7: // OCRQ
3167 // TBA
3168 LOG(3, s, t, "Received OCRQ\n");
3169 break;
3170 case 8: // OCRO
3171 // TBA
3172 LOG(3, s, t, "Received OCRO\n");
3173 break;
3174 case 9: // OCCN
3175 // TBA
3176 LOG(3, s, t, "Received OCCN\n");
3177 break;
3178 case 10: // ICRQ
3179 LOG(3, s, t, "Received ICRQ\n");
3180 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3181 {
3182 controlt *c = controlnew(11); // ICRP
3183
3184 LOG(3, s, t, "Sending ICRP\n");
3185
3186 s = sessionfree;
3187 sessionfree = session[s].next;
3188 memset(&session[s], 0, sizeof(session[s]));
3189
3190 if (s > config->cluster_highest_sessionid)
3191 config->cluster_highest_sessionid = s;
3192
3193 session[s].opened = time_now;
3194 session[s].tunnel = t;
3195 session[s].far = asession;
3196 session[s].last_packet = session[s].last_data = time_now;
3197 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3198 control16(c, 14, s, 1); // assigned session
3199 controladd(c, asession, t); // send the reply
3200
3201 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3202 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3203
3204 session[s].ppp.phase = Establish;
3205 session[s].ppp.lcp = Starting;
3206
3207 STAT(session_created);
3208 break;
3209 }
3210
3211 {
3212 controlt *c = controlnew(14); // CDN
3213 LOG(3, s, t, "Sending CDN\n");
3214 if (!sessionfree)
3215 {
3216 STAT(session_overflow);
3217 LOG(1, 0, t, "No free sessions\n");
3218 control16(c, 1, 4, 0); // temporary lack of resources
3219 }
3220 else
3221 control16(c, 1, 2, 7); // shutting down, try another
3222
3223 controladd(c, asession, t); // send the message
3224 }
3225 return;
3226 case 11: // ICRP
3227 LOG(3, s, t, "Received ICRP\n");
3228 if (session[s].forwardtosession)
3229 {
3230 controlt *c = controlnew(12); // ICCN
3231
3232 session[s].opened = time_now;
3233 session[s].tunnel = t;
3234 session[s].far = asession;
3235 session[s].last_packet = session[s].last_data = time_now;
3236
3237 control32(c, 19, 1, 1); // Framing Type
3238 control32(c, 24, 10000000, 1); // Tx Connect Speed
3239 controladd(c, asession, t); // send the message
3240 LOG(3, s, t, "Sending ICCN\n");
3241 }
3242 break;
3243 case 12: // ICCN
3244 LOG(3, s, t, "Received ICCN\n");
3245 if (amagic == 0) amagic = time_now;
3246 session[s].magic = amagic; // set magic number
3247 session[s].flags = aflags; // set flags received
3248 session[s].mru = PPPoE_MRU; // default
3249 controlnull(t); // ack
3250
3251 // start LCP
3252 sess_local[s].lcp_authtype = config->radius_authprefer;
3253 sess_local[s].ppp_mru = MRU;
3254
3255 // Set multilink options before sending initial LCP packet
3256 sess_local[s].mp_mrru = 1614;
3257 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3258
3259 sendlcp(s, t);
3260 change_state(s, lcp, RequestSent);
3261 break;
3262
3263 case 14: // CDN
3264 LOG(3, s, t, "Received CDN\n");
3265 controlnull(t); // ack
3266 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3267 break;
3268 case 0xFFFF:
3269 LOG(1, s, t, "Missing message type\n");
3270 break;
3271 default:
3272 STAT(tunnel_rx_errors);
3273 if (mandatory)
3274 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3275 else
3276 LOG(1, s, t, "Unknown message type %u\n", message);
3277 break;
3278 }
3279 if (sendchalresponse) free(sendchalresponse);
3280 if (recvchalresponse) free(recvchalresponse);
3281 cluster_send_tunnel(t);
3282 }
3283 else
3284 {
3285 LOG(4, s, t, " Got a ZLB ack\n");
3286 }
3287 }
3288 else
3289 { // data
3290 uint16_t proto;
3291
3292 LOG_HEX(5, "Receive Tunnel Data", p, l);
3293 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3294 { // HDLC address header, discard
3295 p += 2;
3296 l -= 2;
3297 }
3298 if (l < 2)
3299 {
3300 LOG(1, s, t, "Short ppp length %d\n", l);
3301 STAT(tunnel_rx_errors);
3302 return;
3303 }
3304 if (*p & 1)
3305 {
3306 proto = *p++;
3307 l--;
3308 }
3309 else
3310 {
3311 proto = ntohs(*(uint16_t *) p);
3312 p += 2;
3313 l -= 2;
3314 }
3315
3316 if (session[s].forwardtosession)
3317 {
3318 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3319 // Forward to LAC/BAS or Remote LNS session
3320 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3321 return;
3322 }
3323 else if (config->auth_tunnel_change_addr_src)
3324 {
3325 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3326 tunnel[t].port == ntohs(addr->sin_port))
3327 {
3328 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3329 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3330 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3331
3332 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3333 }
3334 }
3335
3336 if (s && !session[s].opened) // Is something wrong??
3337 {
3338 if (!config->cluster_iam_master)
3339 {
3340 // Pass it off to the master to deal with..
3341 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3342 return;
3343 }
3344
3345 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3346 STAT(tunnel_rx_errors);
3347 return;
3348 }
3349
3350 if (proto == PPPPAP)
3351 {
3352 session[s].last_packet = time_now;
3353 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3354 processpap(s, t, p, l);
3355 }
3356 else if (proto == PPPCHAP)
3357 {
3358 session[s].last_packet = time_now;
3359 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3360 processchap(s, t, p, l);
3361 }
3362 else if (proto == PPPLCP)
3363 {
3364 session[s].last_packet = time_now;
3365 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3366 processlcp(s, t, p, l);
3367 }
3368 else if (proto == PPPIPCP)
3369 {
3370 session[s].last_packet = time_now;
3371 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3372 processipcp(s, t, p, l);
3373 }
3374 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3375 {
3376 session[s].last_packet = time_now;
3377 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3378 processipv6cp(s, t, p, l);
3379 }
3380 else if (proto == PPPCCP)
3381 {
3382 session[s].last_packet = time_now;
3383 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3384 processccp(s, t, p, l);
3385 }
3386 else if (proto == PPPIP)
3387 {
3388 if (session[s].die)
3389 {
3390 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3391 return; // closing session, PPP not processed
3392 }
3393
3394 session[s].last_packet = session[s].last_data = time_now;
3395 if (session[s].walled_garden && !config->cluster_iam_master)
3396 {
3397 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3398 return;
3399 }
3400
3401 processipin(s, t, p, l);
3402 }
3403 else if (proto == PPPMP)
3404 {
3405 if (session[s].die)
3406 {
3407 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3408 return; // closing session, PPP not processed
3409 }
3410
3411 session[s].last_packet = session[s].last_data = time_now;
3412 if (!config->cluster_iam_master)
3413 {
3414 // The fragments reconstruction is managed by the Master.
3415 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3416 return;
3417 }
3418
3419 processmpin(s, t, p, l);
3420 }
3421 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3422 {
3423 if (session[s].die)
3424 {
3425 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3426 return; // closing session, PPP not processed
3427 }
3428
3429 session[s].last_packet = session[s].last_data = time_now;
3430 if (session[s].walled_garden && !config->cluster_iam_master)
3431 {
3432 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3433 return;
3434 }
3435
3436 if (!config->cluster_iam_master)
3437 {
3438 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
3439 if (*(p + 6) == 17 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
3440 *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
3441 *(uint16_t *)(p + 34) == 0 && *(p + 36) == 0 && *(p + 37) == 1 && *(p + 38) == 0 && *(p + 39) == 2 &&
3442 *(p + 40) == 2 && *(p + 41) == 0x22 && *(p + 42) == 2 && *(p + 43) == 0x23)
3443 {
3444 // DHCPV6 must be managed by the Master.
3445 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3446 return;
3447 }
3448 }
3449
3450 processipv6in(s, t, p, l);
3451 }
3452 else if (session[s].ppp.lcp == Opened)
3453 {
3454 session[s].last_packet = time_now;
3455 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3456 protoreject(s, t, p, l, proto);
3457 }
3458 else
3459 {
3460 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3461 proto, ppp_state(session[s].ppp.lcp));
3462 }
3463 }
3464 }
3465
3466 // read and process packet on tun
3467 // (i.e. this routine writes to buf[-8]).
3468 static void processtun(uint8_t * buf, int len)
3469 {
3470 LOG_HEX(5, "Receive TUN Data", buf, len);
3471 STAT(tun_rx_packets);
3472 INC_STAT(tun_rx_bytes, len);
3473
3474 CSTAT(processtun);
3475
3476 eth_rx_pkt++;
3477 eth_rx += len;
3478 if (len < 22)
3479 {
3480 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3481 STAT(tun_rx_errors);
3482 return;
3483 }
3484
3485 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3486 processipout(buf, len);
3487 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3488 && config->ipv6_prefix.s6_addr[0])
3489 processipv6out(buf, len);
3490
3491 // Else discard.
3492 }
3493
3494 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3495 // that we look at the whole of the tunnel, radius and session tables
3496 // every second
3497 static void regular_cleanups(double period)
3498 {
3499 // Next tunnel, radius and session to check for actions on.
3500 static tunnelidt t = 0;
3501 static int r = 0;
3502 static sessionidt s = 0;
3503
3504 int t_actions = 0;
3505 int r_actions = 0;
3506 int s_actions = 0;
3507
3508 int t_slice;
3509 int r_slice;
3510 int s_slice;
3511
3512 int i;
3513 int a;
3514
3515 // divide up tables into slices based on the last run
3516 t_slice = config->cluster_highest_tunnelid * period;
3517 r_slice = (MAXRADIUS - 1) * period;
3518 s_slice = config->cluster_highest_sessionid * period;
3519
3520 if (t_slice < 1)
3521 t_slice = 1;
3522 else if (t_slice > config->cluster_highest_tunnelid)
3523 t_slice = config->cluster_highest_tunnelid;
3524
3525 if (r_slice < 1)
3526 r_slice = 1;
3527 else if (r_slice > (MAXRADIUS - 1))
3528 r_slice = MAXRADIUS - 1;
3529
3530 if (s_slice < 1)
3531 s_slice = 1;
3532 else if (s_slice > config->cluster_highest_sessionid)
3533 s_slice = config->cluster_highest_sessionid;
3534
3535 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3536
3537 for (i = 0; i < t_slice; i++)
3538 {
3539 t++;
3540 if (t > config->cluster_highest_tunnelid)
3541 t = 1;
3542
3543 if (t == TUNNEL_ID_PPPOE)
3544 continue;
3545
3546 // check for expired tunnels
3547 if (tunnel[t].die && tunnel[t].die <= TIME)
3548 {
3549 STAT(tunnel_timeout);
3550 tunnelkill(t, "Expired");
3551 t_actions++;
3552 continue;
3553 }
3554 // check for message resend
3555 if (tunnel[t].retry && tunnel[t].controlc)
3556 {
3557 // resend pending messages as timeout on reply
3558 if (tunnel[t].retry <= TIME)
3559 {
3560 controlt *c = tunnel[t].controls;
3561 uint16_t w = tunnel[t].window;
3562 tunnel[t].try++; // another try
3563 if (tunnel[t].try > 5)
3564 tunnelkill(t, "Timeout on control message"); // game over
3565 else
3566 while (c && w--)
3567 {
3568 tunnelsend(c->buf, c->length, t);
3569 c = c->next;
3570 }
3571
3572 t_actions++;
3573 }
3574 }
3575 // Send hello
3576 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3577 {
3578 if (!config->disable_sending_hello)
3579 {
3580 controlt *c = controlnew(6); // sending HELLO
3581 controladd(c, 0, t); // send the message
3582 LOG(3, 0, t, "Sending HELLO message\n");
3583 t_actions++;
3584 }
3585 }
3586
3587 // Check for tunnel changes requested from the CLI
3588 if ((a = cli_tunnel_actions[t].action))
3589 {
3590 cli_tunnel_actions[t].action = 0;
3591 if (a & CLI_TUN_KILL)
3592 {
3593 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3594 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3595 t_actions++;
3596 }
3597 }
3598 }
3599
3600 for (i = 0; i < r_slice; i++)
3601 {
3602 r++;
3603 if (r >= MAXRADIUS)
3604 r = 1;
3605
3606 if (!radius[r].state)
3607 continue;
3608
3609 if (radius[r].retry <= TIME)
3610 {
3611 radiusretry(r);
3612 r_actions++;
3613 }
3614 }
3615
3616 for (i = 0; i < s_slice; i++)
3617 {
3618 s++;
3619 if (s > config->cluster_highest_sessionid)
3620 s = 1;
3621
3622 if (!session[s].opened) // Session isn't in use
3623 continue;
3624
3625 // check for expired sessions
3626 if (session[s].die)
3627 {
3628 if (session[s].die <= TIME)
3629 {
3630 sessionkill(s, "Expired");
3631 s_actions++;
3632 }
3633 continue;
3634 }
3635
3636 // PPP timeouts
3637 if (sess_local[s].lcp.restart <= time_now)
3638 {
3639 int next_state = session[s].ppp.lcp;
3640 switch (session[s].ppp.lcp)
3641 {
3642 case RequestSent:
3643 case AckReceived:
3644 next_state = RequestSent;
3645
3646 case AckSent:
3647 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3648 {
3649 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3650 sendlcp(s, session[s].tunnel);
3651 change_state(s, lcp, next_state);
3652 }
3653 else
3654 {
3655 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3656 STAT(session_timeout);
3657 }
3658
3659 s_actions++;
3660 }
3661
3662 if (session[s].die)
3663 continue;
3664 }
3665
3666 if (sess_local[s].ipcp.restart <= time_now)
3667 {
3668 int next_state = session[s].ppp.ipcp;
3669 switch (session[s].ppp.ipcp)
3670 {
3671 case RequestSent:
3672 case AckReceived:
3673 next_state = RequestSent;
3674
3675 case AckSent:
3676 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3677 {
3678 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3679 sendipcp(s, session[s].tunnel);
3680 change_state(s, ipcp, next_state);
3681 }
3682 else
3683 {
3684 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3685 STAT(session_timeout);
3686 }
3687
3688 s_actions++;
3689 }
3690
3691 if (session[s].die)
3692 continue;
3693 }
3694
3695 if (sess_local[s].ipv6cp.restart <= time_now)
3696 {
3697 int next_state = session[s].ppp.ipv6cp;
3698 switch (session[s].ppp.ipv6cp)
3699 {
3700 case RequestSent:
3701 case AckReceived:
3702 next_state = RequestSent;
3703
3704 case AckSent:
3705 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3706 {
3707 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3708 sendipv6cp(s, session[s].tunnel);
3709 change_state(s, ipv6cp, next_state);
3710 }
3711 else
3712 {
3713 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3714 change_state(s, ipv6cp, Stopped);
3715 }
3716
3717 s_actions++;
3718 }
3719 }
3720
3721 if (sess_local[s].ccp.restart <= time_now)
3722 {
3723 int next_state = session[s].ppp.ccp;
3724 switch (session[s].ppp.ccp)
3725 {
3726 case RequestSent:
3727 case AckReceived:
3728 next_state = RequestSent;
3729
3730 case AckSent:
3731 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3732 {
3733 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3734 sendccp(s, session[s].tunnel);
3735 change_state(s, ccp, next_state);
3736 }
3737 else
3738 {
3739 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3740 change_state(s, ccp, Stopped);
3741 }
3742
3743 s_actions++;
3744 }
3745 }
3746
3747 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3748 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3749 {
3750 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3751 STAT(session_timeout);
3752 s_actions++;
3753 continue;
3754 }
3755
3756 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3757 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3758 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3759 {
3760 uint8_t b[MAXETHER];
3761
3762 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3763 if (!q) continue;
3764
3765 *q = EchoReq;
3766 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3767 *(uint16_t *)(q + 2) = htons(8); // Length
3768 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3769
3770 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3771 (int)(time_now - session[s].last_packet));
3772
3773 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3774 sess_local[s].last_echo = time_now;
3775 s_actions++;
3776 }
3777
3778 // Drop sessions who have reached session_timeout seconds
3779 if (session[s].session_timeout)
3780 {
3781 bundleidt bid = session[s].bundle;
3782 if (bid)
3783 {
3784 if (time_now - bundle[bid].last_check >= 1)
3785 {
3786 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3787 bundle[bid].last_check = time_now;
3788 if (bundle[bid].online_time >= session[s].session_timeout)
3789 {
3790 int ses;
3791 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3792 {
3793 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3794 s_actions++;
3795 continue;
3796 }
3797 }
3798 }
3799 }
3800 else if (time_now - session[s].opened >= session[s].session_timeout)
3801 {
3802 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3803 s_actions++;
3804 continue;
3805 }
3806 }
3807
3808 // Drop sessions who have reached idle_timeout seconds
3809 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3810 {
3811 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3812 STAT(session_timeout);
3813 s_actions++;
3814 continue;
3815 }
3816
3817 // Check for actions requested from the CLI
3818 if ((a = cli_session_actions[s].action))
3819 {
3820 int send = 0;
3821
3822 cli_session_actions[s].action = 0;
3823 if (a & CLI_SESS_KILL)
3824 {
3825 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3826 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3827 a = 0; // dead, no need to check for other actions
3828 s_actions++;
3829 }
3830
3831 if (a & CLI_SESS_NOSNOOP)
3832 {
3833 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3834 session[s].snoop_ip = 0;
3835 session[s].snoop_port = 0;
3836 s_actions++;
3837 send++;
3838 }
3839 else if (a & CLI_SESS_SNOOP)
3840 {
3841 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3842 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3843 cli_session_actions[s].snoop_port);
3844
3845 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3846 session[s].snoop_port = cli_session_actions[s].snoop_port;
3847 s_actions++;
3848 send++;
3849 }
3850
3851 if (a & CLI_SESS_NOTHROTTLE)
3852 {
3853 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3854 throttle_session(s, 0, 0);
3855 s_actions++;
3856 send++;
3857 }
3858 else if (a & CLI_SESS_THROTTLE)
3859 {
3860 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3861 cli_session_actions[s].throttle_in,
3862 cli_session_actions[s].throttle_out);
3863
3864 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3865 s_actions++;
3866 send++;
3867 }
3868
3869 if (a & CLI_SESS_NOFILTER)
3870 {
3871 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3872 filter_session(s, 0, 0);
3873 s_actions++;
3874 send++;
3875 }
3876 else if (a & CLI_SESS_FILTER)
3877 {
3878 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3879 cli_session_actions[s].filter_in,
3880 cli_session_actions[s].filter_out);
3881
3882 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3883 s_actions++;
3884 send++;
3885 }
3886
3887 if (send)
3888 cluster_send_session(s);
3889 }
3890
3891 // RADIUS interim accounting
3892 if (config->radius_accounting && config->radius_interim > 0
3893 && session[s].ip && !session[s].walled_garden
3894 && !sess_local[s].radius // RADIUS already in progress
3895 && time_now - sess_local[s].last_interim >= config->radius_interim
3896 && session[s].flags & SESSION_STARTED)
3897 {
3898 int rad = radiusnew(s);
3899 if (!rad)
3900 {
3901 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3902 STAT(radius_overflow);
3903 continue;
3904 }
3905
3906 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3907 session[s].user, session[s].unique_id);
3908
3909 radiussend(rad, RADIUSINTERIM);
3910 sess_local[s].last_interim = time_now;
3911 s_actions++;
3912 }
3913 }
3914
3915 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3916 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3917 }
3918
3919 //
3920 // Are we in the middle of a tunnel update, or radius
3921 // requests??
3922 //
3923 static int still_busy(void)
3924 {
3925 int i;
3926 static clockt last_talked = 0;
3927 static clockt start_busy_wait = 0;
3928
3929 #ifdef BGP
3930 static time_t stopped_bgp = 0;
3931 if (bgp_configured)
3932 {
3933 if (!stopped_bgp)
3934 {
3935 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3936
3937 for (i = 0; i < BGP_NUM_PEERS; i++)
3938 if (bgp_peers[i].state == Established)
3939 bgp_stop(&bgp_peers[i]);
3940
3941 stopped_bgp = time_now;
3942
3943 if (!config->cluster_iam_master)
3944 {
3945 // we don't want to become master
3946 cluster_send_ping(0);
3947
3948 return 1;
3949 }
3950 }
3951
3952 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3953 return 1;
3954 }
3955 #endif /* BGP */
3956
3957 if (!config->cluster_iam_master)
3958 return 0;
3959
3960 if (main_quit == QUIT_SHUTDOWN)
3961 {
3962 static int dropped = 0;
3963 if (!dropped)
3964 {
3965 int i;
3966
3967 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3968 for (i = 1; i < MAXTUNNEL; i++)
3969 if (tunnel[i].ip || tunnel[i].state)
3970 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3971
3972 dropped = 1;
3973 }
3974 }
3975
3976 if (start_busy_wait == 0)
3977 start_busy_wait = TIME;
3978
3979 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3980 {
3981 if (!tunnel[i].controlc)
3982 continue;
3983
3984 if (last_talked != TIME)
3985 {
3986 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3987 last_talked = TIME;
3988 }
3989 return 1;
3990 }
3991
3992 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3993 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3994 {
3995 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3996 return 0;
3997 }
3998
3999 for (i = 1; i < MAXRADIUS; i++)
4000 {
4001 if (radius[i].state == RADIUSNULL)
4002 continue;
4003 if (radius[i].state == RADIUSWAIT)
4004 continue;
4005
4006 if (last_talked != TIME)
4007 {
4008 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
4009 last_talked = TIME;
4010 }
4011 return 1;
4012 }
4013
4014 return 0;
4015 }
4016
4017 #ifdef HAVE_EPOLL
4018 # include <sys/epoll.h>
4019 #else
4020 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4021 # include "fake_epoll.h"
4022 #endif
4023
4024 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4025 #define BASE_FDS (9 + MAX_UDPFD)
4026
4027 // additional polled fds
4028 #ifdef BGP
4029 # define EXTRA_FDS BGP_NUM_PEERS
4030 #else
4031 # define EXTRA_FDS 0
4032 #endif
4033
4034 // main loop - gets packets on tun or udp and processes them
4035 static void mainloop(void)
4036 {
4037 int i, j;
4038 uint8_t buf[65536];
4039 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4040 // and the forwarded pppoe session
4041 int size_bufp = sizeof(buf) - 32;
4042 clockt next_cluster_ping = 0; // send initial ping immediately
4043 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4044 int maxevent = sizeof(events)/sizeof(*events);
4045
4046 if ((epollfd = epoll_create(maxevent)) < 0)
4047 {
4048 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4049 exit(1);
4050 }
4051
4052 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",
4053 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4054
4055 /* setup our fds to poll for input */
4056 {
4057 static struct event_data d[BASE_FDS];
4058 struct epoll_event e;
4059
4060 e.events = EPOLLIN;
4061 i = 0;
4062
4063 if (clifd >= 0)
4064 {
4065 d[i].type = FD_TYPE_CLI;
4066 e.data.ptr = &d[i++];
4067 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4068 }
4069
4070 d[i].type = FD_TYPE_CLUSTER;
4071 e.data.ptr = &d[i++];
4072 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4073
4074 d[i].type = FD_TYPE_TUN;
4075 e.data.ptr = &d[i++];
4076 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4077
4078 d[i].type = FD_TYPE_CONTROL;
4079 e.data.ptr = &d[i++];
4080 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4081
4082 d[i].type = FD_TYPE_DAE;
4083 e.data.ptr = &d[i++];
4084 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4085
4086 d[i].type = FD_TYPE_NETLINK;
4087 e.data.ptr = &d[i++];
4088 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4089
4090 d[i].type = FD_TYPE_PPPOEDISC;
4091 e.data.ptr = &d[i++];
4092 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4093
4094 d[i].type = FD_TYPE_PPPOESESS;
4095 e.data.ptr = &d[i++];
4096 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4097
4098 for (j = 0; j < config->nbudpfd; j++)
4099 {
4100 d[i].type = FD_TYPE_UDP;
4101 d[i].index = j;
4102 e.data.ptr = &d[i++];
4103 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4104 }
4105 }
4106
4107 #ifdef BGP
4108 signal(SIGPIPE, SIG_IGN);
4109 bgp_setup(config->as_number);
4110 if (config->bind_address)
4111 bgp_add_route(config->bind_address, 0xffffffff);
4112
4113 for (i = 0; i < BGP_NUM_PEERS; i++)
4114 {
4115 if (config->neighbour[i].name[0])
4116 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4117 config->neighbour[i].as, config->neighbour[i].keepalive,
4118 config->neighbour[i].hold, config->neighbour[i].update_source,
4119 0); /* 0 = routing disabled */
4120 }
4121 #endif /* BGP */
4122
4123 while (!main_quit || still_busy())
4124 {
4125 int more = 0;
4126 int n;
4127
4128
4129 if (main_reload)
4130 {
4131 main_reload = 0;
4132 read_config_file();
4133 config->reload_config++;
4134 }
4135
4136 if (config->reload_config)
4137 {
4138 config->reload_config = 0;
4139 update_config();
4140 }
4141
4142 #ifdef BGP
4143 bgp_set_poll();
4144 #endif /* BGP */
4145
4146 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4147 STAT(select_called);
4148
4149 TIME = now(NULL);
4150 if (n < 0)
4151 {
4152 if (errno == EINTR ||
4153 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4154 continue;
4155
4156 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4157 break; // exit
4158 }
4159
4160 if (n)
4161 {
4162 struct sockaddr_in addr;
4163 struct in_addr local;
4164 socklen_t alen;
4165 int c, s;
4166 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4167 int pppoesess_ready = 0;
4168 int pppoesess_pkts = 0;
4169 int tun_ready = 0;
4170 int cluster_ready = 0;
4171 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4172 int tun_pkts = 0;
4173 int cluster_pkts = 0;
4174 #ifdef BGP
4175 uint32_t bgp_events[BGP_NUM_PEERS];
4176 memset(bgp_events, 0, sizeof(bgp_events));
4177 #endif /* BGP */
4178
4179 for (c = n, i = 0; i < c; i++)
4180 {
4181 struct event_data *d = events[i].data.ptr;
4182
4183 switch (d->type)
4184 {
4185 case FD_TYPE_CLI: // CLI connections
4186 {
4187 int cli;
4188
4189 alen = sizeof(addr);
4190 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4191 {
4192 cli_do(cli);
4193 close(cli);
4194 }
4195 else
4196 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4197
4198 n--;
4199 break;
4200 }
4201
4202 // these are handled below, with multiple interleaved reads
4203 case FD_TYPE_CLUSTER: cluster_ready++; break;
4204 case FD_TYPE_TUN: tun_ready++; break;
4205 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4206 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4207
4208 case FD_TYPE_PPPOEDISC: // pppoe discovery
4209 s = read(pppoediscfd, p, size_bufp);
4210 if (s > 0) process_pppoe_disc(p, s);
4211 n--;
4212 break;
4213
4214 case FD_TYPE_CONTROL: // nsctl commands
4215 alen = sizeof(addr);
4216 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4217 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4218 n--;
4219 break;
4220
4221 case FD_TYPE_DAE: // DAE requests
4222 alen = sizeof(addr);
4223 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4224 if (s > 0) processdae(p, s, &addr, alen, &local);
4225 n--;
4226 break;
4227
4228 case FD_TYPE_RADIUS: // RADIUS response
4229 alen = sizeof(addr);
4230 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4231 if (s >= 0 && config->cluster_iam_master)
4232 {
4233 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4234 addr.sin_addr.s_addr == config->radiusserver[1])
4235 processrad(p, s, d->index);
4236 else
4237 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4238 fmtaddr(addr.sin_addr.s_addr, 0));
4239 }
4240
4241 n--;
4242 break;
4243
4244 #ifdef BGP
4245 case FD_TYPE_BGP:
4246 bgp_events[d->index] = events[i].events;
4247 n--;
4248 break;
4249 #endif /* BGP */
4250
4251 case FD_TYPE_NETLINK:
4252 {
4253 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4254 s = netlink_recv(p, size_bufp);
4255 if (nh->nlmsg_type == NLMSG_ERROR)
4256 {
4257 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4258 if (errmsg->error)
4259 {
4260 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4261 {
4262 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4263 exit(1);
4264 }
4265 else
4266 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4267 }
4268 // else it's a ack
4269 }
4270 else
4271 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);
4272 n--;
4273 break;
4274 }
4275
4276 default:
4277 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4278 }
4279 }
4280
4281 #ifdef BGP
4282 bgp_process(bgp_events);
4283 #endif /* BGP */
4284
4285 for (c = 0; n && c < config->multi_read_count; c++)
4286 {
4287 for (j = 0; j < config->nbudpfd; j++)
4288 {
4289 // L2TP and L2TP REMOTE LNS
4290 if (udp_ready[j])
4291 {
4292 alen = sizeof(addr);
4293 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4294 {
4295 processudp(p, s, &addr, j);
4296 udp_pkts[j]++;
4297 }
4298 else
4299 {
4300 udp_ready[j] = 0;
4301 n--;
4302 }
4303 }
4304 }
4305
4306 // incoming IP
4307 if (tun_ready)
4308 {
4309 if ((s = read(tunfd, p, size_bufp)) > 0)
4310 {
4311 processtun(p, s);
4312 tun_pkts++;
4313 }
4314 else
4315 {
4316 tun_ready = 0;
4317 n--;
4318 }
4319 }
4320
4321 // pppoe session
4322 if (pppoesess_ready)
4323 {
4324 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4325 {
4326 process_pppoe_sess(p, s);
4327 pppoesess_pkts++;
4328 }
4329 else
4330 {
4331 pppoesess_ready = 0;
4332 n--;
4333 }
4334 }
4335
4336 // cluster
4337 if (cluster_ready)
4338 {
4339 alen = sizeof(addr);
4340 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4341 {
4342 processcluster(p, s, addr.sin_addr.s_addr);
4343 cluster_pkts++;
4344 }
4345 else
4346 {
4347 cluster_ready = 0;
4348 n--;
4349 }
4350 }
4351 }
4352
4353 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4354 STAT(multi_read_used);
4355
4356 if (c >= config->multi_read_count)
4357 {
4358 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4359 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4360 STAT(multi_read_exceeded);
4361 more++;
4362 }
4363 }
4364 #ifdef BGP
4365 else
4366 /* no event received, but timers could still have expired */
4367 bgp_process_peers_timers();
4368 #endif /* BGP */
4369
4370 if (time_changed)
4371 {
4372 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4373
4374 // Log current traffic stats
4375 snprintf(config->bandwidth, sizeof(config->bandwidth),
4376 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4377 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4378 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4379 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4380
4381 udp_tx = udp_rx = 0;
4382 udp_rx_pkt = eth_rx_pkt = 0;
4383 eth_tx = eth_rx = 0;
4384 time_changed = 0;
4385
4386 if (config->dump_speed)
4387 printf("%s\n", config->bandwidth);
4388
4389 // Update the internal time counter
4390 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4391
4392 {
4393 // Run timer hooks
4394 struct param_timer p = { time_now };
4395 run_plugins(PLUGIN_TIMER, &p);
4396 }
4397 }
4398
4399 // Runs on every machine (master and slaves).
4400 if (next_cluster_ping <= TIME)
4401 {
4402 // Check to see which of the cluster is still alive..
4403
4404 cluster_send_ping(basetime); // Only does anything if we're a slave
4405 cluster_check_master(); // ditto.
4406
4407 cluster_heartbeat(); // Only does anything if we're a master.
4408 cluster_check_slaves(); // ditto.
4409
4410 master_update_counts(); // If we're a slave, send our byte counters to our master.
4411
4412 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4413 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4414 else
4415 next_cluster_ping = TIME + config->cluster_hb_interval;
4416 }
4417
4418 if (!config->cluster_iam_master)
4419 continue;
4420
4421 // Run token bucket filtering queue..
4422 // Only run it every 1/10th of a second.
4423 {
4424 static clockt last_run = 0;
4425 if (last_run != TIME)
4426 {
4427 last_run = TIME;
4428 tbf_run_timer();
4429 }
4430 }
4431
4432 // Handle timeouts, retries etc.
4433 {
4434 static double last_clean = 0;
4435 double this_clean;
4436 double diff;
4437
4438 TIME = now(&this_clean);
4439 diff = this_clean - last_clean;
4440
4441 // Run during idle time (after we've handled
4442 // all incoming packets) or every 1/10th sec
4443 if (!more || diff > 0.1)
4444 {
4445 regular_cleanups(diff);
4446 last_clean = this_clean;
4447 }
4448 }
4449
4450 if (*config->accounting_dir)
4451 {
4452 static clockt next_acct = 0;
4453 static clockt next_shut_acct = 0;
4454
4455 if (next_acct <= TIME)
4456 {
4457 // Dump accounting data
4458 next_acct = TIME + ACCT_TIME;
4459 next_shut_acct = TIME + ACCT_SHUT_TIME;
4460 dump_acct_info(1);
4461 }
4462 else if (next_shut_acct <= TIME)
4463 {
4464 // Dump accounting data for shutdown sessions
4465 next_shut_acct = TIME + ACCT_SHUT_TIME;
4466 if (shut_acct_n)
4467 dump_acct_info(0);
4468 }
4469 }
4470 }
4471
4472 // Are we the master and shutting down??
4473 if (config->cluster_iam_master)
4474 cluster_heartbeat(); // Flush any queued changes..
4475
4476 // Ok. Notify everyone we're shutting down. If we're
4477 // the master, this will force an election.
4478 cluster_send_ping(0);
4479
4480 //
4481 // Important!!! We MUST not process any packets past this point!
4482 LOG(1, 0, 0, "Shutdown complete\n");
4483 }
4484
4485 static void stripdomain(char *host)
4486 {
4487 char *p;
4488
4489 if ((p = strchr(host, '.')))
4490 {
4491 char *domain = 0;
4492 char _domain[1024];
4493
4494 // strip off domain
4495 FILE *resolv = fopen("/etc/resolv.conf", "r");
4496 if (resolv)
4497 {
4498 char buf[1024];
4499 char *b;
4500
4501 while (fgets(buf, sizeof(buf), resolv))
4502 {
4503 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4504 continue;
4505
4506 if (!isspace(buf[6]))
4507 continue;
4508
4509 b = buf + 7;
4510 while (isspace(*b)) b++;
4511
4512 if (*b)
4513 {
4514 char *d = b;
4515 while (*b && !isspace(*b)) b++;
4516 *b = 0;
4517 if (buf[0] == 'd') // domain is canonical
4518 {
4519 domain = d;
4520 break;
4521 }
4522
4523 // first search line
4524 if (!domain)
4525 {
4526 // hold, may be subsequent domain line
4527 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4528 domain = _domain;
4529 }
4530 }
4531 }
4532
4533 fclose(resolv);
4534 }
4535
4536 if (domain)
4537 {
4538 int hl = strlen(host);
4539 int dl = strlen(domain);
4540 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4541 host[hl -dl - 1] = 0;
4542 }
4543 else
4544 {
4545 *p = 0; // everything after first dot
4546 }
4547 }
4548 }
4549
4550 // Init data structures
4551 static void initdata(int optdebug, char *optconfig)
4552 {
4553 int i;
4554
4555 if (!(config = shared_malloc(sizeof(configt))))
4556 {
4557 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4558 exit(1);
4559 }
4560
4561 memset(config, 0, sizeof(configt));
4562 time(&config->start_time);
4563 strncpy(config->config_file, optconfig, strlen(optconfig));
4564 config->debug = optdebug;
4565 config->num_tbfs = MAXTBFS;
4566 config->rl_rate = 28; // 28kbps
4567 config->cluster_mcast_ttl = 1;
4568 config->cluster_master_min_adv = 1;
4569 config->ppp_restart_time = 3;
4570 config->ppp_max_configure = 10;
4571 config->ppp_max_failure = 5;
4572 config->kill_timedout_sessions = 1;
4573 strcpy(config->random_device, RANDOMDEVICE);
4574 // Set default value echo_timeout and idle_echo_timeout
4575 config->echo_timeout = ECHO_TIMEOUT;
4576 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4577
4578 log_stream = stderr;
4579
4580 #ifdef RINGBUFFER
4581 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4582 {
4583 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4584 exit(1);
4585 }
4586 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4587 #endif
4588
4589 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4590 {
4591 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4592 exit(1);
4593 }
4594 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4595 {
4596 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4597 exit(1);
4598 }
4599 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4600 {
4601 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4602 exit(1);
4603 }
4604 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4605 {
4606 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4607 exit(1);
4608 }
4609 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4610 {
4611 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4612 exit(1);
4613 }
4614
4615 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4616 {
4617 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4618 exit(1);
4619 }
4620
4621 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4622 {
4623 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4624 exit(1);
4625 }
4626
4627 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4628 {
4629 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4630 exit(1);
4631 }
4632
4633 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4634 {
4635 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4636 exit(1);
4637 }
4638 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4639
4640 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4641 {
4642 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4643 exit(1);
4644 }
4645 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4646
4647 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4648 {
4649 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4650 exit(1);
4651 }
4652 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4653
4654 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4655 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4656 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4657 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4658 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4659
4660 // Put all the sessions on the free list marked as undefined.
4661 for (i = 1; i < MAXSESSION; i++)
4662 {
4663 session[i].next = i + 1;
4664 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4665 }
4666 session[MAXSESSION - 1].next = 0;
4667 sessionfree = 1;
4668
4669 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4670 for (i = 1; i < MAXTUNNEL; i++)
4671 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4672
4673 for (i = 1; i < MAXBUNDLE; i++) {
4674 bundle[i].state = BUNDLEUNDEF;
4675 }
4676
4677 if (!*hostname)
4678 {
4679 // Grab my hostname unless it's been specified
4680 gethostname(hostname, sizeof(hostname));
4681 stripdomain(hostname);
4682 }
4683
4684 _statistics->start_time = _statistics->last_reset = time(NULL);
4685
4686 #ifdef BGP
4687 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4688 {
4689 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4690 exit(1);
4691 }
4692 #endif /* BGP */
4693
4694 lac_initremotelnsdata();
4695 }
4696
4697 static int assign_ip_address(sessionidt s)
4698 {
4699 uint32_t i;
4700 int best = -1;
4701 time_t best_time = time_now;
4702 char *u = session[s].user;
4703 char reuse = 0;
4704
4705
4706 CSTAT(assign_ip_address);
4707
4708 for (i = 1; i < ip_pool_size; i++)
4709 {
4710 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4711 continue;
4712
4713 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4714 {
4715 best = i;
4716 reuse = 1;
4717 break;
4718 }
4719
4720 if (ip_address_pool[i].last < best_time)
4721 {
4722 best = i;
4723 if (!(best_time = ip_address_pool[i].last))
4724 break; // never used, grab this one
4725 }
4726 }
4727
4728 if (best < 0)
4729 {
4730 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4731 return 0;
4732 }
4733
4734 session[s].ip = ip_address_pool[best].address;
4735 session[s].ip_pool_index = best;
4736 ip_address_pool[best].assigned = 1;
4737 ip_address_pool[best].last = time_now;
4738 ip_address_pool[best].session = s;
4739 if (session[s].walled_garden)
4740 /* Don't track addresses of users in walled garden (note: this
4741 means that their address isn't "sticky" even if they get
4742 un-gardened). */
4743 ip_address_pool[best].user[0] = 0;
4744 else
4745 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4746
4747 STAT(ip_allocated);
4748 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4749 reuse ? "Reusing" : "Allocating", best);
4750
4751 return 1;
4752 }
4753
4754 static void free_ip_address(sessionidt s)
4755 {
4756 int i = session[s].ip_pool_index;
4757
4758
4759 CSTAT(free_ip_address);
4760
4761 if (!session[s].ip)
4762 return; // what the?
4763
4764 if (i < 0) // Is this actually part of the ip pool?
4765 i = 0;
4766
4767 STAT(ip_freed);
4768 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4769 session[s].ip = 0;
4770 ip_address_pool[i].assigned = 0;
4771 ip_address_pool[i].session = 0;
4772 ip_address_pool[i].last = time_now;
4773 }
4774
4775 //
4776 // Fsck the address pool against the session table.
4777 // Normally only called when we become a master.
4778 //
4779 // This isn't perfect: We aren't keep tracking of which
4780 // users used to have an IP address.
4781 //
4782 void rebuild_address_pool(void)
4783 {
4784 int i;
4785
4786 //
4787 // Zero the IP pool allocation, and build
4788 // a map from IP address to pool index.
4789 for (i = 1; i < MAXIPPOOL; ++i)
4790 {
4791 ip_address_pool[i].assigned = 0;
4792 ip_address_pool[i].session = 0;
4793 if (!ip_address_pool[i].address)
4794 continue;
4795
4796 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4797 }
4798
4799 for (i = 0; i < MAXSESSION; ++i)
4800 {
4801 int ipid;
4802 if (!(session[i].opened && session[i].ip))
4803 continue;
4804
4805 ipid = - lookup_ipmap(htonl(session[i].ip));
4806
4807 if (session[i].ip_pool_index < 0)
4808 {
4809 // Not allocated out of the pool.
4810 if (ipid < 1) // Not found in the pool either? good.
4811 continue;
4812
4813 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4814 i, fmtaddr(session[i].ip, 0), ipid);
4815
4816 // Fall through and process it as part of the pool.
4817 }
4818
4819
4820 if (ipid > MAXIPPOOL || ipid < 0)
4821 {
4822 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4823 ipid = -1;
4824 session[i].ip_pool_index = ipid;
4825 continue;
4826 }
4827
4828 ip_address_pool[ipid].assigned = 1;
4829 ip_address_pool[ipid].session = i;
4830 ip_address_pool[ipid].last = time_now;
4831 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4832 session[i].ip_pool_index = ipid;
4833 cache_ipmap(session[i].ip, i); // Fix the ip map.
4834 }
4835 }
4836
4837 //
4838 // Fix the address pool to match a changed session.
4839 // (usually when the master sends us an update).
4840 static void fix_address_pool(int sid)
4841 {
4842 int ipid;
4843
4844 ipid = session[sid].ip_pool_index;
4845
4846 if (ipid > ip_pool_size)
4847 return; // Ignore it. rebuild_address_pool will fix it up.
4848
4849 if (ip_address_pool[ipid].address != session[sid].ip)
4850 return; // Just ignore it. rebuild_address_pool will take care of it.
4851
4852 ip_address_pool[ipid].assigned = 1;
4853 ip_address_pool[ipid].session = sid;
4854 ip_address_pool[ipid].last = time_now;
4855 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4856 }
4857
4858 //
4859 // Add a block of addresses to the IP pool to hand out.
4860 //
4861 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4862 {
4863 int i;
4864 if (prefixlen == 0)
4865 prefixlen = 32; // Host route only.
4866
4867 addr &= 0xffffffff << (32 - prefixlen);
4868
4869 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4870 return ;
4871
4872 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4873 {
4874 if ((i & 0xff) == 0 || (i&0xff) == 255)
4875 continue; // Skip 0 and broadcast addresses.
4876
4877 ip_address_pool[ip_pool_size].address = i;
4878 ip_address_pool[ip_pool_size].assigned = 0;
4879 ++ip_pool_size;
4880 if (ip_pool_size >= MAXIPPOOL)
4881 {
4882 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4883 return;
4884 }
4885 }
4886 }
4887
4888 // Initialize the IP address pool
4889 static void initippool()
4890 {
4891 FILE *f;
4892 char *p;
4893 char buf[4096];
4894 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4895
4896 if (!(f = fopen(IPPOOLFILE, "r")))
4897 {
4898 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4899 exit(1);
4900 }
4901
4902 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4903 {
4904 char *pool = buf;
4905 buf[4095] = 0; // Force it to be zero terminated/
4906
4907 if (*buf == '#' || *buf == '\n')
4908 continue; // Skip comments / blank lines
4909 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4910 if ((p = (char *)strchr(buf, ':')))
4911 {
4912 in_addr_t src;
4913 *p = '\0';
4914 src = inet_addr(buf);
4915 if (src == INADDR_NONE)
4916 {
4917 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4918 exit(1);
4919 }
4920 // This entry is for a specific IP only
4921 if (src != config->bind_address)
4922 continue;
4923 *p = ':';
4924 pool = p+1;
4925 }
4926 if ((p = (char *)strchr(pool, '/')))
4927 {
4928 // It's a range
4929 int numbits = 0;
4930 in_addr_t start = 0;
4931
4932 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4933 *p++ = 0;
4934 if (!*p || !(numbits = atoi(p)))
4935 {
4936 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4937 continue;
4938 }
4939 start = ntohl(inet_addr(pool));
4940
4941 // Add a static route for this pool
4942 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4943 fmtaddr(htonl(start), 0), numbits);
4944
4945 routeset(0, start, numbits, 0, 1);
4946
4947 add_to_ip_pool(start, numbits);
4948 }
4949 else
4950 {
4951 // It's a single ip address
4952 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4953 }
4954 }
4955 fclose(f);
4956 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4957 }
4958
4959 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4960 {
4961 struct sockaddr_in snoop_addr = {0};
4962 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4963 return;
4964
4965 snoop_addr.sin_family = AF_INET;
4966 snoop_addr.sin_addr.s_addr = destination;
4967 snoop_addr.sin_port = ntohs(port);
4968
4969 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4970 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4971 htons(snoop_addr.sin_port));
4972
4973 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4974 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4975
4976 STAT(packets_snooped);
4977 }
4978
4979 static int dump_session(FILE **f, sessiont *s)
4980 {
4981 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4982 return 1;
4983
4984 if (!*f)
4985 {
4986 char filename[1024];
4987 char timestr[64];
4988 time_t now = time(NULL);
4989
4990 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4991 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4992
4993 if (!(*f = fopen(filename, "w")))
4994 {
4995 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4996 return 0;
4997 }
4998
4999 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
5000 if(config->account_all_origin)
5001 {
5002 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
5003 "# host: %s\n"
5004 "# endpoint: %s\n"
5005 "# time: %ld\n"
5006 "# uptime: %ld\n"
5007 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
5008 hostname,
5009 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5010 now,
5011 now - basetime);
5012 }
5013 else
5014 {
5015 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
5016 "# host: %s\n"
5017 "# endpoint: %s\n"
5018 "# time: %ld\n"
5019 "# uptime: %ld\n"
5020 "# format: username ip qos uptxoctets downrxoctets\n",
5021 hostname,
5022 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5023 now,
5024 now - basetime);
5025 }
5026 }
5027
5028 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
5029 if(config->account_all_origin)
5030 {
5031 fprintf(*f, "%s %s %d %u %u %s\n",
5032 s->user, // username
5033 fmtaddr(htonl(s->ip), 0), // ip
5034 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5035 (uint32_t) s->cin_delta, // uptxoctets
5036 (uint32_t) s->cout_delta, // downrxoctets
5037 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
5038 }
5039 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
5040 {
5041 fprintf(*f, "%s %s %d %u %u\n",
5042 s->user, // username
5043 fmtaddr(htonl(s->ip), 0), // ip
5044 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5045 (uint32_t) s->cin_delta, // uptxoctets
5046 (uint32_t) s->cout_delta); // downrxoctets
5047 }
5048
5049 s->cin_delta = s->cout_delta = 0;
5050
5051 return 1;
5052 }
5053
5054 static void dump_acct_info(int all)
5055 {
5056 int i;
5057 FILE *f = NULL;
5058
5059
5060 CSTAT(dump_acct_info);
5061
5062 if (shut_acct_n)
5063 {
5064 for (i = 0; i < shut_acct_n; i++)
5065 dump_session(&f, &shut_acct[i]);
5066
5067 shut_acct_n = 0;
5068 }
5069
5070 if (all)
5071 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5072 dump_session(&f, &session[i]);
5073
5074 if (f)
5075 fclose(f);
5076 }
5077
5078 // Main program
5079 int main(int argc, char *argv[])
5080 {
5081 int i;
5082 int optdebug = 0;
5083 char *optconfig = CONFIGFILE;
5084
5085 time(&basetime); // start clock
5086
5087 // scan args
5088 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5089 {
5090 switch (i)
5091 {
5092 case 'd':
5093 if (fork()) exit(0);
5094 setsid();
5095 if(!freopen("/dev/null", "r", stdin)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno));
5096 if(!freopen("/dev/null", "w", stdout)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno));
5097 if(!freopen("/dev/null", "w", stderr)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno));
5098 break;
5099 case 'v':
5100 optdebug++;
5101 break;
5102 case 'c':
5103 optconfig = optarg;
5104 break;
5105 case 'h':
5106 snprintf(hostname, sizeof(hostname), "%s", optarg);
5107 break;
5108 default:
5109 printf("Args are:\n"
5110 "\t-d\t\tDetach from terminal\n"
5111 "\t-c <file>\tConfig file\n"
5112 "\t-h <hostname>\tForce hostname\n"
5113 "\t-v\t\tDebug\n");
5114
5115 return (0);
5116 break;
5117 }
5118 }
5119
5120 // Start the timer routine off
5121 time(&time_now);
5122 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5123
5124 initplugins();
5125 initdata(optdebug, optconfig);
5126
5127 init_cli();
5128 read_config_file();
5129 /* set hostname /after/ having read the config file */
5130 if (*config->hostname)
5131 strcpy(hostname, config->hostname);
5132 cli_init_complete(hostname);
5133 update_config();
5134 init_tbf(config->num_tbfs);
5135
5136 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5137 LOG(0, 0, 0, "Copyright (c) 2012, 2013, 2014 ISP FDN & SAMESWIRELESS\n");
5138 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5139 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5140 {
5141 struct rlimit rlim;
5142 rlim.rlim_cur = RLIM_INFINITY;
5143 rlim.rlim_max = RLIM_INFINITY;
5144 // Remove the maximum core size
5145 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5146 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5147
5148 // Make core dumps go to /tmp
5149 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno));
5150 }
5151
5152 if (config->scheduler_fifo)
5153 {
5154 int ret;
5155 struct sched_param params = {0};
5156 params.sched_priority = 1;
5157
5158 if (get_nprocs() < 2)
5159 {
5160 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5161 config->scheduler_fifo = 0;
5162 }
5163 else
5164 {
5165 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5166 {
5167 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5168 }
5169 else
5170 {
5171 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5172 config->scheduler_fifo = 0;
5173 }
5174 }
5175 }
5176
5177 initnetlink();
5178
5179 /* Set up the cluster communications port. */
5180 if (cluster_init() < 0)
5181 exit(1);
5182
5183 inittun();
5184 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5185
5186 if (*config->pppoe_if_to_bind)
5187 {
5188 init_pppoe();
5189 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5190 }
5191
5192 if (!config->nbmultiaddress)
5193 {
5194 config->bind_n_address[0] = config->bind_address;
5195 config->nbmultiaddress++;
5196 }
5197 config->nbudpfd = config->nbmultiaddress;
5198 for (i = 0; i < config->nbudpfd; i++)
5199 initudp(&udpfd[i], config->bind_n_address[i]);
5200 initlacudp();
5201 config->indexlacudpfd = config->nbudpfd;
5202 udpfd[config->indexlacudpfd] = udplacfd;
5203 config->nbudpfd++;
5204
5205 initcontrol();
5206 initdae();
5207
5208 // Intercept
5209 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5210
5211 initrad();
5212 initippool();
5213 dhcpv6_init();
5214
5215 // seed prng
5216 {
5217 unsigned seed = time_now ^ getpid();
5218 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5219 srand(seed);
5220 }
5221
5222 signal(SIGHUP, sighup_handler);
5223 signal(SIGCHLD, sigchild_handler);
5224 signal(SIGTERM, shutdown_handler);
5225 signal(SIGINT, shutdown_handler);
5226 signal(SIGQUIT, shutdown_handler);
5227
5228 // Prevent us from getting paged out
5229 if (config->lock_pages)
5230 {
5231 if (!mlockall(MCL_CURRENT))
5232 LOG(1, 0, 0, "Locking pages into memory\n");
5233 else
5234 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5235 }
5236
5237 mainloop();
5238
5239 /* remove plugins (so cleanup code gets run) */
5240 plugins_done();
5241
5242 // Remove the PID file if we wrote it
5243 if (config->wrote_pid && *config->pid_file == '/')
5244 unlink(config->pid_file);
5245
5246 /* kill CLI children */
5247 signal(SIGTERM, SIG_IGN);
5248 kill(0, SIGTERM);
5249 return 0;
5250 }
5251
5252 static void sighup_handler(int sig)
5253 {
5254 main_reload++;
5255 }
5256
5257 static void shutdown_handler(int sig)
5258 {
5259 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5260 }
5261
5262 static void sigchild_handler(int sig)
5263 {
5264 while (waitpid(-1, NULL, WNOHANG) > 0)
5265 ;
5266 }
5267
5268 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5269 {
5270 MD5_CTX ctx;
5271 *challenge_response = NULL;
5272
5273 if (!*config->l2tp_secret)
5274 {
5275 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5276 return;
5277 }
5278
5279 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5280
5281 *challenge_response = calloc(17, 1);
5282
5283 MD5_Init(&ctx);
5284 MD5_Update(&ctx, &id, 1);
5285 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5286 MD5_Update(&ctx, challenge, challenge_length);
5287 MD5_Final(*challenge_response, &ctx);
5288
5289 return;
5290 }
5291
5292 static int facility_value(char *name)
5293 {
5294 int i;
5295 for (i = 0; facilitynames[i].c_name; i++)
5296 {
5297 if (strcmp(facilitynames[i].c_name, name) == 0)
5298 return facilitynames[i].c_val;
5299 }
5300 return 0;
5301 }
5302
5303 static void update_config()
5304 {
5305 int i;
5306 char *p;
5307 static int timeout = 0;
5308 static int interval = 0;
5309
5310 // Update logging
5311 closelog();
5312 syslog_log = 0;
5313 if (log_stream)
5314 {
5315 if (log_stream != stderr)
5316 fclose(log_stream);
5317
5318 log_stream = NULL;
5319 }
5320
5321 if (*config->log_filename)
5322 {
5323 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5324 {
5325 char *p = config->log_filename + 7;
5326 if (*p)
5327 {
5328 openlog("l2tpns", LOG_PID, facility_value(p));
5329 syslog_log = 1;
5330 }
5331 }
5332 else if (strchr(config->log_filename, '/') == config->log_filename)
5333 {
5334 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5335 {
5336 fseek(log_stream, 0, SEEK_END);
5337 setbuf(log_stream, NULL);
5338 }
5339 else
5340 {
5341 log_stream = stderr;
5342 setbuf(log_stream, NULL);
5343 }
5344 }
5345 }
5346 else
5347 {
5348 log_stream = stderr;
5349 setbuf(log_stream, NULL);
5350 }
5351
5352 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5353 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5354
5355 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5356 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5357 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5358
5359 // reset MRU/MSS globals
5360 MRU = config->l2tp_mtu - L2TP_HDRS;
5361 if (MRU > PPPoE_MRU)
5362 MRU = PPPoE_MRU;
5363
5364 MSS = MRU - TCP_HDRS;
5365
5366 // Update radius
5367 config->numradiusservers = 0;
5368 for (i = 0; i < MAXRADSERVER; i++)
5369 if (config->radiusserver[i])
5370 {
5371 config->numradiusservers++;
5372 // Set radius port: if not set, take the port from the
5373 // first radius server. For the first radius server,
5374 // take the #defined default value from l2tpns.h
5375
5376 // test twice, In case someone works with
5377 // a secondary radius server without defining
5378 // a primary one, this will work even then.
5379 if (i > 0 && !config->radiusport[i])
5380 config->radiusport[i] = config->radiusport[i-1];
5381 if (!config->radiusport[i])
5382 config->radiusport[i] = RADPORT;
5383 }
5384
5385 if (!config->numradiusservers)
5386 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5387
5388 // parse radius_authtypes_s
5389 config->radius_authtypes = config->radius_authprefer = 0;
5390 p = config->radius_authtypes_s;
5391 while (p && *p)
5392 {
5393 char *s = strpbrk(p, " \t,");
5394 int type = 0;
5395
5396 if (s)
5397 {
5398 *s++ = 0;
5399 while (*s == ' ' || *s == '\t')
5400 s++;
5401
5402 if (!*s)
5403 s = 0;
5404 }
5405
5406 if (!strncasecmp("chap", p, strlen(p)))
5407 type = AUTHCHAP;
5408 else if (!strncasecmp("pap", p, strlen(p)))
5409 type = AUTHPAP;
5410 else
5411 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5412
5413 config->radius_authtypes |= type;
5414 if (!config->radius_authprefer)
5415 config->radius_authprefer = type;
5416
5417 p = s;
5418 }
5419
5420 if (!config->radius_authtypes)
5421 {
5422 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5423 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5424 }
5425
5426 // normalise radius_authtypes_s
5427 if (config->radius_authprefer == AUTHPAP)
5428 {
5429 strcpy(config->radius_authtypes_s, "pap");
5430 if (config->radius_authtypes & AUTHCHAP)
5431 strcat(config->radius_authtypes_s, ", chap");
5432 }
5433 else
5434 {
5435 strcpy(config->radius_authtypes_s, "chap");
5436 if (config->radius_authtypes & AUTHPAP)
5437 strcat(config->radius_authtypes_s, ", pap");
5438 }
5439
5440 if (!config->radius_dae_port)
5441 config->radius_dae_port = DAEPORT;
5442
5443 if(!config->bind_portremotelns)
5444 config->bind_portremotelns = L2TPLACPORT;
5445 if(!config->bind_address_remotelns)
5446 config->bind_address_remotelns = INADDR_ANY;
5447
5448 if (*config->bind_multi_address)
5449 {
5450 char *sip = config->bind_multi_address;
5451 char *n = sip;
5452 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5453 config->nbmultiaddress = 0;
5454
5455 while (*sip && (sip < e))
5456 {
5457 in_addr_t ip = 0;
5458 uint8_t u = 0;
5459
5460 while (n < e && (*n == ',' || *n == ' ')) n++;
5461
5462 while (n < e && (isdigit(*n) || *n == '.'))
5463 {
5464 if (*n == '.')
5465 {
5466 ip = (ip << 8) + u;
5467 u = 0;
5468 }
5469 else
5470 u = u * 10 + *n - '0';
5471 n++;
5472 }
5473 ip = (ip << 8) + u;
5474 n++;
5475
5476 if (ip)
5477 {
5478 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5479 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5480 config->nbmultiaddress++;
5481 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5482
5483 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5484 }
5485
5486 sip = n;
5487 }
5488
5489 if (config->nbmultiaddress >= 1)
5490 {
5491 config->bind_address = config->bind_n_address[0];
5492 config->iftun_address = config->bind_address;
5493 }
5494 }
5495
5496 if(!config->iftun_address)
5497 {
5498 config->iftun_address = config->bind_address;
5499 config->iftun_n_address[0] = config->iftun_address;
5500 }
5501
5502 if (*config->multi_hostname)
5503 {
5504 char *shost = config->multi_hostname;
5505 char *n = shost;
5506 char *e = config->multi_hostname + strlen(config->multi_hostname);
5507 config->nbmultihostname = 0;
5508
5509 while (*shost && (shost < e))
5510 {
5511 while ((n < e) && (*n == ' ' || *n == ',' || *n == '\t')) n++;
5512
5513 i = 0;
5514 while (n < e && (*n != ',') && (*n != '\t'))
5515 {
5516 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5517 n++;i++;
5518 }
5519
5520 if (i > 0)
5521 {
5522 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5523 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5524 config->nbmultihostname++;
5525 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5526 }
5527
5528 shost = n;
5529 }
5530
5531 if (config->nbmultihostname >= 1)
5532 {
5533 strcpy(hostname, config->multi_n_hostname[0]);
5534 strcpy(config->hostname, hostname);
5535 }
5536 }
5537
5538 if (!*config->pppoe_ac_name)
5539 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5540
5541 // re-initialise the random number source
5542 initrandom(config->random_device);
5543
5544 // Update plugins
5545 for (i = 0; i < MAXPLUGINS; i++)
5546 {
5547 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5548 continue;
5549
5550 if (*config->plugins[i])
5551 {
5552 // Plugin added
5553 add_plugin(config->plugins[i]);
5554 }
5555 else if (*config->old_plugins[i])
5556 {
5557 // Plugin removed
5558 remove_plugin(config->old_plugins[i]);
5559 }
5560 }
5561
5562 // Guest change
5563 guest_accounts_num = 0;
5564 char *p2 = config->guest_user;
5565 while (p2 && *p2)
5566 {
5567 char *s = strpbrk(p2, " \t,");
5568 if (s)
5569 {
5570 *s++ = 0;
5571 while (*s == ' ' || *s == '\t')
5572 s++;
5573
5574 if (!*s)
5575 s = 0;
5576 }
5577
5578 strcpy(guest_users[guest_accounts_num], p2);
5579 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5580 guest_accounts_num++;
5581 p2 = s;
5582 }
5583 // Rebuild the guest_user array
5584 strcpy(config->guest_user, "");
5585 int ui = 0;
5586 for (ui=0; ui<guest_accounts_num; ui++)
5587 {
5588 strcat(config->guest_user, guest_users[ui]);
5589 if (ui<guest_accounts_num-1)
5590 {
5591 strcat(config->guest_user, ",");
5592 }
5593 }
5594
5595
5596 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5597 if (!config->multi_read_count) config->multi_read_count = 10;
5598 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5599 if (!*config->cluster_interface)
5600 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5601
5602 if (!config->cluster_hb_interval)
5603 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5604
5605 if (!config->cluster_hb_timeout)
5606 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5607
5608 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5609 {
5610 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5611 // late, ensure we're sufficiently larger than that
5612 int t = 4 * config->cluster_hb_interval + 11;
5613
5614 if (config->cluster_hb_timeout < t)
5615 {
5616 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5617 config->cluster_hb_timeout = t;
5618 }
5619
5620 // Push timing changes to the slaves immediately if we're the master
5621 if (config->cluster_iam_master)
5622 cluster_heartbeat();
5623
5624 interval = config->cluster_hb_interval;
5625 timeout = config->cluster_hb_timeout;
5626 }
5627
5628 // Write PID file
5629 if (*config->pid_file == '/' && !config->wrote_pid)
5630 {
5631 FILE *f;
5632 if ((f = fopen(config->pid_file, "w")))
5633 {
5634 fprintf(f, "%d\n", getpid());
5635 fclose(f);
5636 config->wrote_pid = 1;
5637 }
5638 else
5639 {
5640 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5641 }
5642 }
5643 }
5644
5645 static void read_config_file()
5646 {
5647 FILE *f;
5648
5649 if (!config->config_file) return;
5650 if (!(f = fopen(config->config_file, "r")))
5651 {
5652 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5653 return;
5654 }
5655
5656 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5657 cli_do_file(f);
5658 LOG(3, 0, 0, "Done reading config file\n");
5659 fclose(f);
5660 }
5661
5662 int sessionsetup(sessionidt s, tunnelidt t)
5663 {
5664 // A session now exists, set it up
5665 in_addr_t ip;
5666 char *user;
5667 sessionidt i;
5668 int r;
5669
5670 CSTAT(sessionsetup);
5671
5672 LOG(3, s, t, "Doing session setup for session\n");
5673
5674 // Join a bundle if the MRRU option is accepted
5675 if(session[s].mrru > 0 && session[s].bundle == 0)
5676 {
5677 LOG(3, s, t, "This session can be part of multilink bundle\n");
5678 if (join_bundle(s) > 0)
5679 cluster_send_bundle(session[s].bundle);
5680 else
5681 {
5682 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5683 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5684 return 0;
5685 }
5686 }
5687
5688 if (!session[s].ip)
5689 {
5690 assign_ip_address(s);
5691 if (!session[s].ip)
5692 {
5693 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5694 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5695 return 0;
5696 }
5697 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5698 fmtaddr(htonl(session[s].ip), 0));
5699 }
5700
5701 // Make sure this is right
5702 session[s].tunnel = t;
5703
5704 // zap old sessions with same IP and/or username
5705 // Don't kill gardened sessions - doing so leads to a DoS
5706 // from someone who doesn't need to know the password
5707 {
5708 ip = session[s].ip;
5709 user = session[s].user;
5710 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5711 {
5712 if (i == s) continue;
5713 if (!session[s].opened) break;
5714 // Allow duplicate sessions for multilink ones of the same bundle.
5715 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5716
5717 if (ip == session[i].ip)
5718 {
5719 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5720 continue;
5721 }
5722
5723 if (config->allow_duplicate_users) continue;
5724 if (session[s].walled_garden || session[i].walled_garden) continue;
5725 // Guest change
5726 int found = 0;
5727 int gu;
5728 for (gu = 0; gu < guest_accounts_num; gu++)
5729 {
5730 if (!strcasecmp(user, guest_users[gu]))
5731 {
5732 found = 1;
5733 break;
5734 }
5735 }
5736 if (found) continue;
5737
5738 // Drop the new session in case of duplicate sessionss, not the old one.
5739 if (!strcasecmp(user, session[i].user))
5740 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5741 }
5742 }
5743
5744 // no need to set a route for the same IP address of the bundle
5745 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5746 {
5747 int routed = 0;
5748
5749 // Add the route for this session.
5750 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5751 {
5752 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5753 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5754 routed++;
5755
5756 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5757 }
5758
5759 // Static IPs need to be routed if not already
5760 // convered by a Framed-Route. Anything else is part
5761 // of the IP address pool and is already routed, it
5762 // just needs to be added to the IP cache.
5763 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5764 if (session[s].ip_pool_index == -1) // static ip
5765 {
5766 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5767 }
5768 else
5769 cache_ipmap(session[s].ip, s);
5770 }
5771
5772 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5773 lcp_open(s, t); // transition to Network phase and send initial IPCP
5774
5775 // Run the plugin's against this new session.
5776 {
5777 struct param_new_session data = { &tunnel[t], &session[s] };
5778 run_plugins(PLUGIN_NEW_SESSION, &data);
5779 }
5780
5781 // Allocate TBFs if throttled
5782 if (session[s].throttle_in || session[s].throttle_out)
5783 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5784
5785 session[s].last_packet = session[s].last_data = time_now;
5786
5787 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5788 fmtaddr(htonl(session[s].ip), 0),
5789 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5790
5791 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5792
5793 return 1; // RADIUS OK and IP allocated, done...
5794 }
5795
5796 //
5797 // This session just got dropped on us by the master or something.
5798 // Make sure our tables up up to date...
5799 //
5800 int load_session(sessionidt s, sessiont *new)
5801 {
5802 int i;
5803 int newip = 0;
5804
5805 // Sanity checks.
5806 if (new->ip_pool_index >= MAXIPPOOL ||
5807 new->tunnel >= MAXTUNNEL)
5808 {
5809 LOG(0, s, 0, "Strange session update received!\n");
5810 // FIXME! What to do here?
5811 return 0;
5812 }
5813
5814 //
5815 // Ok. All sanity checks passed. Now we're committed to
5816 // loading the new session.
5817 //
5818
5819 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5820
5821 // See if routes/ip cache need updating
5822 if (new->ip != session[s].ip)
5823 newip++;
5824
5825 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5826 if (new->route[i].ip != session[s].route[i].ip ||
5827 new->route[i].prefixlen != session[s].route[i].prefixlen)
5828 newip++;
5829
5830 // needs update
5831 if (newip)
5832 {
5833 int routed = 0;
5834
5835 // remove old routes...
5836 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5837 {
5838 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5839 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5840 routed++;
5841
5842 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5843 }
5844
5845 // ...ip
5846 if (session[s].ip)
5847 {
5848 if (session[s].ip_pool_index == -1) // static IP
5849 {
5850 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5851 }
5852 else // It's part of the IP pool, remove it manually.
5853 uncache_ipmap(session[s].ip);
5854 }
5855
5856 // remove old IPV6 routes...
5857 if (session[s].ipv6route.s6_addr[0] && session[s].ipv6prefixlen)
5858 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
5859
5860 if (session[s].ipv6address.s6_addr[0])
5861 {
5862 route6set(s, session[s].ipv6address, 128, 0);
5863 }
5864
5865 routed = 0;
5866
5867 // add new routes...
5868 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5869 {
5870 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5871 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5872 routed++;
5873
5874 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5875 }
5876
5877 // ...ip
5878 if (new->ip)
5879 {
5880 // If there's a new one, add it.
5881 if (new->ip_pool_index == -1)
5882 {
5883 if (!routed) routeset(s, new->ip, 0, 0, 1);
5884 }
5885 else
5886 cache_ipmap(new->ip, s);
5887 }
5888 }
5889
5890 // check v6 routing
5891 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5892 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5893
5894 if (new->ipv6address.s6_addr[0] && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5895 {
5896 route6set(s, new->ipv6address, 128, 1);
5897 }
5898
5899 // check filters
5900 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5901 {
5902 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5903 new->filter_in = 0;
5904 }
5905
5906 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5907 {
5908 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5909 new->filter_out = 0;
5910 }
5911
5912 if (new->filter_in != session[s].filter_in)
5913 {
5914 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5915 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5916 }
5917
5918 if (new->filter_out != session[s].filter_out)
5919 {
5920 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5921 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5922 }
5923
5924 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5925 // for walking the sessions to forward byte counts to the master.
5926 config->cluster_highest_sessionid = s;
5927
5928 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5929
5930 // Do fixups into address pool.
5931 if (new->ip_pool_index != -1)
5932 fix_address_pool(s);
5933
5934 return 1;
5935 }
5936
5937 static void initplugins()
5938 {
5939 int i;
5940
5941 loaded_plugins = ll_init();
5942 // Initialize the plugins to nothing
5943 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5944 plugins[i] = ll_init();
5945 }
5946
5947 static void *open_plugin(char *plugin_name, int load)
5948 {
5949 char path[256] = "";
5950
5951 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5952 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5953 return dlopen(path, RTLD_NOW);
5954 }
5955
5956 // plugin callback to get a config value
5957 static void *getconfig(char *key, enum config_typet type)
5958 {
5959 int i;
5960
5961 for (i = 0; config_values[i].key; i++)
5962 {
5963 if (!strcmp(config_values[i].key, key))
5964 {
5965 if (config_values[i].type == type)
5966 return ((void *) config) + config_values[i].offset;
5967
5968 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5969 key, type, config_values[i].type);
5970
5971 return 0;
5972 }
5973 }
5974
5975 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5976 return 0;
5977 }
5978
5979 static int add_plugin(char *plugin_name)
5980 {
5981 static struct pluginfuncs funcs = {
5982 _log,
5983 _log_hex,
5984 fmtaddr,
5985 sessionbyuser,
5986 sessiontbysessionidt,
5987 sessionidtbysessiont,
5988 radiusnew,
5989 radiussend,
5990 getconfig,
5991 sessionshutdown,
5992 sessionkill,
5993 throttle_session,
5994 cluster_send_session,
5995 };
5996
5997 void *p = open_plugin(plugin_name, 1);
5998 int (*initfunc)(struct pluginfuncs *);
5999 int i;
6000
6001 if (!p)
6002 {
6003 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
6004 return -1;
6005 }
6006
6007 if (ll_contains(loaded_plugins, p))
6008 {
6009 dlclose(p);
6010 return 0; // already loaded
6011 }
6012
6013 {
6014 int *v = dlsym(p, "plugin_api_version");
6015 if (!v || *v != PLUGIN_API_VERSION)
6016 {
6017 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
6018 dlclose(p);
6019 return -1;
6020 }
6021 }
6022
6023 if ((initfunc = dlsym(p, "plugin_init")))
6024 {
6025 if (!initfunc(&funcs))
6026 {
6027 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6028 dlclose(p);
6029 return -1;
6030 }
6031 }
6032
6033 ll_push(loaded_plugins, p);
6034
6035 for (i = 0; i < max_plugin_functions; i++)
6036 {
6037 void *x;
6038 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6039 {
6040 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
6041 ll_push(plugins[i], x);
6042 }
6043 }
6044
6045 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
6046 return 1;
6047 }
6048
6049 static void run_plugin_done(void *plugin)
6050 {
6051 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
6052
6053 if (donefunc)
6054 donefunc();
6055 }
6056
6057 static int remove_plugin(char *plugin_name)
6058 {
6059 void *p = open_plugin(plugin_name, 0);
6060 int loaded = 0;
6061
6062 if (!p)
6063 return -1;
6064
6065 if (ll_contains(loaded_plugins, p))
6066 {
6067 int i;
6068 for (i = 0; i < max_plugin_functions; i++)
6069 {
6070 void *x;
6071 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6072 ll_delete(plugins[i], x);
6073 }
6074
6075 ll_delete(loaded_plugins, p);
6076 run_plugin_done(p);
6077 loaded = 1;
6078 }
6079
6080 dlclose(p);
6081 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6082 return loaded;
6083 }
6084
6085 int run_plugins(int plugin_type, void *data)
6086 {
6087 int (*func)(void *data);
6088
6089 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6090 return PLUGIN_RET_ERROR;
6091
6092 ll_reset(plugins[plugin_type]);
6093 while ((func = ll_next(plugins[plugin_type])))
6094 {
6095 int r = func(data);
6096
6097 if (r != PLUGIN_RET_OK)
6098 return r; // stop here
6099 }
6100
6101 return PLUGIN_RET_OK;
6102 }
6103
6104 static void plugins_done()
6105 {
6106 void *p;
6107
6108 ll_reset(loaded_plugins);
6109 while ((p = ll_next(loaded_plugins)))
6110 run_plugin_done(p);
6111 }
6112
6113 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6114 {
6115 struct nsctl request;
6116 struct nsctl response;
6117 int type = unpack_control(&request, buf, len);
6118 int r;
6119 void *p;
6120
6121 if (log_stream && config->debug >= 4)
6122 {
6123 if (type < 0)
6124 {
6125 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6126 fmtaddr(addr->sin_addr.s_addr, 0), type);
6127 }
6128 else
6129 {
6130 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6131 dump_control(&request, log_stream);
6132 }
6133 }
6134
6135 switch (type)
6136 {
6137 case NSCTL_REQ_LOAD:
6138 if (request.argc != 1)
6139 {
6140 response.type = NSCTL_RES_ERR;
6141 response.argc = 1;
6142 response.argv[0] = "name of plugin required";
6143 }
6144 else if ((r = add_plugin(request.argv[0])) < 1)
6145 {
6146 response.type = NSCTL_RES_ERR;
6147 response.argc = 1;
6148 response.argv[0] = !r
6149 ? "plugin already loaded"
6150 : "error loading plugin";
6151 }
6152 else
6153 {
6154 response.type = NSCTL_RES_OK;
6155 response.argc = 0;
6156 }
6157
6158 break;
6159
6160 case NSCTL_REQ_UNLOAD:
6161 if (request.argc != 1)
6162 {
6163 response.type = NSCTL_RES_ERR;
6164 response.argc = 1;
6165 response.argv[0] = "name of plugin required";
6166 }
6167 else if ((r = remove_plugin(request.argv[0])) < 1)
6168 {
6169 response.type = NSCTL_RES_ERR;
6170 response.argc = 1;
6171 response.argv[0] = !r
6172 ? "plugin not loaded"
6173 : "plugin not found";
6174 }
6175 else
6176 {
6177 response.type = NSCTL_RES_OK;
6178 response.argc = 0;
6179 }
6180
6181 break;
6182
6183 case NSCTL_REQ_HELP:
6184 response.type = NSCTL_RES_OK;
6185 response.argc = 0;
6186
6187 ll_reset(loaded_plugins);
6188 while ((p = ll_next(loaded_plugins)))
6189 {
6190 char **help = dlsym(p, "plugin_control_help");
6191 while (response.argc < 0xff && help && *help)
6192 response.argv[response.argc++] = *help++;
6193 }
6194
6195 break;
6196
6197 case NSCTL_REQ_CONTROL:
6198 {
6199 struct param_control param = {
6200 config->cluster_iam_master,
6201 request.argc,
6202 request.argv,
6203 0,
6204 NULL,
6205 };
6206
6207 int r = run_plugins(PLUGIN_CONTROL, &param);
6208
6209 if (r == PLUGIN_RET_ERROR)
6210 {
6211 response.type = NSCTL_RES_ERR;
6212 response.argc = 1;
6213 response.argv[0] = param.additional
6214 ? param.additional
6215 : "error returned by plugin";
6216 }
6217 else if (r == PLUGIN_RET_NOTMASTER)
6218 {
6219 static char msg[] = "must be run on master: 000.000.000.000";
6220
6221 response.type = NSCTL_RES_ERR;
6222 response.argc = 1;
6223 if (config->cluster_master_address)
6224 {
6225 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6226 response.argv[0] = msg;
6227 }
6228 else
6229 {
6230 response.argv[0] = "must be run on master: none elected";
6231 }
6232 }
6233 else if (!(param.response & NSCTL_RESPONSE))
6234 {
6235 response.type = NSCTL_RES_ERR;
6236 response.argc = 1;
6237 response.argv[0] = param.response
6238 ? "unrecognised response value from plugin"
6239 : "unhandled action";
6240 }
6241 else
6242 {
6243 response.type = param.response;
6244 response.argc = 0;
6245 if (param.additional)
6246 {
6247 response.argc = 1;
6248 response.argv[0] = param.additional;
6249 }
6250 }
6251 }
6252
6253 break;
6254
6255 default:
6256 response.type = NSCTL_RES_ERR;
6257 response.argc = 1;
6258 response.argv[0] = "error unpacking control packet";
6259 }
6260
6261 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6262 if (!buf)
6263 {
6264 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6265 return;
6266 }
6267
6268 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6269 if (r > 0)
6270 {
6271 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6272 if (log_stream && config->debug >= 4)
6273 {
6274 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6275 dump_control(&response, log_stream);
6276 }
6277 }
6278 else
6279 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6280 fmtaddr(addr->sin_addr.s_addr, 0), r);
6281
6282 free(buf);
6283 }
6284
6285 static tunnelidt new_tunnel()
6286 {
6287 tunnelidt i;
6288 for (i = 1; i < MAXTUNNEL; i++)
6289 {
6290 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6291 {
6292 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6293 if (i > config->cluster_highest_tunnelid)
6294 config->cluster_highest_tunnelid = i;
6295 return i;
6296 }
6297 }
6298 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6299 return 0;
6300 }
6301
6302 //
6303 // We're becoming the master. Do any required setup..
6304 //
6305 // This is principally telling all the plugins that we're
6306 // now a master, and telling them about all the sessions
6307 // that are active too..
6308 //
6309 void become_master(void)
6310 {
6311 int s, i;
6312 static struct event_data d[RADIUS_FDS];
6313 struct epoll_event e;
6314
6315 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6316
6317 // running a bunch of iptables commands is slow and can cause
6318 // the master to drop tunnels on takeover--kludge around the
6319 // problem by forking for the moment (note: race)
6320 if (!fork_and_close())
6321 {
6322 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6323 {
6324 if (!session[s].opened) // Not an in-use session.
6325 continue;
6326
6327 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6328 }
6329 exit(0);
6330 }
6331
6332 // add radius fds
6333 e.events = EPOLLIN;
6334 for (i = 0; i < RADIUS_FDS; i++)
6335 {
6336 d[i].type = FD_TYPE_RADIUS;
6337 d[i].index = i;
6338 e.data.ptr = &d[i];
6339
6340 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6341 }
6342 }
6343
6344 int cmd_show_hist_idle(struct cli_def *cli, const char *command, char **argv, int argc)
6345 {
6346 int s, i;
6347 int count = 0;
6348 int buckets[64];
6349
6350 if (CLI_HELP_REQUESTED)
6351 return CLI_HELP_NO_ARGS;
6352
6353 time(&time_now);
6354 for (i = 0; i < 64;++i) buckets[i] = 0;
6355
6356 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6357 {
6358 int idle;
6359 if (!session[s].opened)
6360 continue;
6361
6362 idle = time_now - session[s].last_data;
6363 idle /= 5 ; // In multiples of 5 seconds.
6364 if (idle < 0)
6365 idle = 0;
6366 if (idle > 63)
6367 idle = 63;
6368
6369 ++count;
6370 ++buckets[idle];
6371 }
6372
6373 for (i = 0; i < 63; ++i)
6374 {
6375 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6376 }
6377 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6378 cli_print(cli, "%d total sessions open.", count);
6379 return CLI_OK;
6380 }
6381
6382 int cmd_show_hist_open(struct cli_def *cli, const char *command, char **argv, int argc)
6383 {
6384 int s, i;
6385 int count = 0;
6386 int buckets[64];
6387
6388 if (CLI_HELP_REQUESTED)
6389 return CLI_HELP_NO_ARGS;
6390
6391 time(&time_now);
6392 for (i = 0; i < 64;++i) buckets[i] = 0;
6393
6394 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6395 {
6396 int open = 0, d;
6397 if (!session[s].opened)
6398 continue;
6399
6400 d = time_now - session[s].opened;
6401 if (d < 0)
6402 d = 0;
6403 while (d > 1 && open < 32)
6404 {
6405 ++open;
6406 d >>= 1; // half.
6407 }
6408 ++count;
6409 ++buckets[open];
6410 }
6411
6412 s = 1;
6413 for (i = 0; i < 30; ++i)
6414 {
6415 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6416 s <<= 1;
6417 }
6418 cli_print(cli, "%d total sessions open.", count);
6419 return CLI_OK;
6420 }
6421
6422 /* Unhide an avp.
6423 *
6424 * This unencodes the AVP using the L2TP secret and the previously
6425 * stored random vector. It overwrites the hidden data with the
6426 * unhidden AVP subformat.
6427 */
6428 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6429 {
6430 MD5_CTX ctx;
6431 uint8_t digest[16];
6432 uint8_t *last;
6433 size_t d = 0;
6434 uint16_t m = htons(type);
6435
6436 // Compute initial pad
6437 MD5_Init(&ctx);
6438 MD5_Update(&ctx, (unsigned char *) &m, 2);
6439 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6440 MD5_Update(&ctx, vector, vec_len);
6441 MD5_Final(digest, &ctx);
6442
6443 // pointer to last decoded 16 octets
6444 last = value;
6445
6446 while (len > 0)
6447 {
6448 // calculate a new pad based on the last decoded block
6449 if (d >= sizeof(digest))
6450 {
6451 MD5_Init(&ctx);
6452 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6453 MD5_Update(&ctx, last, sizeof(digest));
6454 MD5_Final(digest, &ctx);
6455
6456 d = 0;
6457 last = value;
6458 }
6459
6460 *value++ ^= digest[d++];
6461 len--;
6462 }
6463 }
6464
6465 int find_filter(char const *name, size_t len)
6466 {
6467 int free = -1;
6468 int i;
6469
6470 for (i = 0; i < MAXFILTER; i++)
6471 {
6472 if (!*ip_filters[i].name)
6473 {
6474 if (free < 0)
6475 free = i;
6476
6477 continue;
6478 }
6479
6480 if (strlen(ip_filters[i].name) != len)
6481 continue;
6482
6483 if (!strncmp(ip_filters[i].name, name, len))
6484 return i;
6485 }
6486
6487 return free;
6488 }
6489
6490 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6491 {
6492 switch (p->op)
6493 {
6494 case FILTER_PORT_OP_EQ: return port == p->port;
6495 case FILTER_PORT_OP_NEQ: return port != p->port;
6496 case FILTER_PORT_OP_GT: return port > p->port;
6497 case FILTER_PORT_OP_LT: return port < p->port;
6498 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6499 }
6500
6501 return 0;
6502 }
6503
6504 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6505 {
6506 switch (op)
6507 {
6508 case FILTER_FLAG_OP_ANY:
6509 return (flags & sflags) || (~flags & cflags);
6510
6511 case FILTER_FLAG_OP_ALL:
6512 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6513
6514 case FILTER_FLAG_OP_EST:
6515 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6516 }
6517
6518 return 0;
6519 }
6520
6521 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6522 {
6523 uint16_t frag_offset;
6524 uint8_t proto;
6525 in_addr_t src_ip;
6526 in_addr_t dst_ip;
6527 uint16_t src_port = 0;
6528 uint16_t dst_port = 0;
6529 uint8_t flags = 0;
6530 ip_filter_rulet *rule;
6531
6532 if (len < 20) // up to end of destination address
6533 return 0;
6534
6535 if ((*buf >> 4) != 4) // IPv4
6536 return 0;
6537
6538 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6539 proto = buf[9];
6540 src_ip = *(in_addr_t *) (buf + 12);
6541 dst_ip = *(in_addr_t *) (buf + 16);
6542
6543 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6544 {
6545 int l = (buf[0] & 0xf) * 4; // length of IP header
6546 if (len < l + 4) // ports
6547 return 0;
6548
6549 src_port = ntohs(*(uint16_t *) (buf + l));
6550 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6551 if (proto == IPPROTO_TCP)
6552 {
6553 if (len < l + 14) // flags
6554 return 0;
6555
6556 flags = buf[l + 13] & 0x3f;
6557 }
6558 }
6559
6560 for (rule = ip_filters[filter].rules; rule->action; rule++)
6561 {
6562 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6563 continue;
6564
6565 if (rule->src_wild != INADDR_BROADCAST &&
6566 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6567 continue;
6568
6569 if (rule->dst_wild != INADDR_BROADCAST &&
6570 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6571 continue;
6572
6573 if (frag_offset)
6574 {
6575 // layer 4 deny rules are skipped
6576 if (rule->action == FILTER_ACTION_DENY &&
6577 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6578 continue;
6579 }
6580 else
6581 {
6582 if (rule->frag)
6583 continue;
6584
6585 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6586 {
6587 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6588 continue;
6589
6590 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6591 continue;
6592
6593 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6594 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6595 continue;
6596 }
6597 }
6598
6599 // matched
6600 rule->counter++;
6601 return rule->action == FILTER_ACTION_PERMIT;
6602 }
6603
6604 // default deny
6605 return 0;
6606 }
6607
6608 tunnelidt lac_new_tunnel()
6609 {
6610 return new_tunnel();
6611 }
6612
6613 void lac_tunnelclear(tunnelidt t)
6614 {
6615 tunnelclear(t);
6616 }
6617
6618 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6619 {
6620 uint16_t version = 0x0100; // protocol version
6621
6622 tunnel[t].state = TUNNELOPENING;
6623
6624 // Sent SCCRQ - Start Control Connection Request
6625 controlt *c = controlnew(1); // sending SCCRQ
6626 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6627 controls(c, 8, Vendor_name, 1); // Vendor name
6628 control16(c, 2, version, 1); // protocol version
6629 control32(c, 3, 3, 1); // framing Capabilities
6630 control16(c, 9, t, 1); // assigned tunnel
6631 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6632 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6633 controladd(c, 0, t); // send
6634 }
6635
6636 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6637 {
6638 // Sent ICRQ Incoming-call-request
6639 controlt *c = controlnew(10); // ICRQ
6640
6641 control16(c, 14, s, 1); // assigned sesion
6642 call_serial_number++;
6643 control32(c, 15, call_serial_number, 1); // call serial number
6644 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6645 controladd(c, 0, t); // send
6646 }
6647
6648 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6649 {
6650 tunnelshutdown(t, reason, result, error, msg);
6651 }
6652