Fix: IPv6 prefix routing on slave cluster
[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[16]; // 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]) & 0xF0)>>4];
986 i = 1;
987 s = curnode->sess;
988
989 while (s == 0 && i < 32 && curnode->branch != NULL)
990 {
991 if (i & 1)
992 curnode = &curnode->branch[ip.s6_addr[i>>1] & 0x0F];
993 else
994 curnode = &curnode->branch[(ip.s6_addr[i>>1] & 0xF0)>>4];
995
996 s = curnode->sess;
997 i++;
998 }
999
1000 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
1001 inet_ntop(AF_INET6, &ip, ipv6addr,
1002 INET6_ADDRSTRLEN),
1003 s);
1004
1005 return s;
1006 }
1007
1008 sessionidt sessionbyip(in_addr_t ip)
1009 {
1010 sessionidt s = lookup_ipmap(ip);
1011 CSTAT(sessionbyip);
1012
1013 if (s > 0 && s < MAXSESSION && session[s].opened)
1014 return s;
1015
1016 return 0;
1017 }
1018
1019 sessionidt sessionbyipv6(struct in6_addr ip)
1020 {
1021 sessionidt s;
1022 CSTAT(sessionbyipv6);
1023
1024 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
1025 (ip.s6_addr[0] == 0xFE &&
1026 ip.s6_addr[1] == 0x80 &&
1027 ip.s6_addr16[1] == 0 &&
1028 ip.s6_addr16[2] == 0 &&
1029 ip.s6_addr16[3] == 0))
1030 {
1031 in_addr_t *pipv4 = (in_addr_t *) &ip.s6_addr[8];
1032 s = lookup_ipmap(*pipv4);
1033 } else {
1034 s = lookup_ipv6map(ip);
1035 }
1036
1037 if (s > 0 && s < MAXSESSION && session[s].opened)
1038 return s;
1039
1040 return 0;
1041 }
1042
1043 sessionidt sessionbyipv6new(struct in6_addr ip)
1044 {
1045 sessionidt s;
1046 CSTAT(sessionbyipv6new);
1047
1048 s = lookup_ipv6map(ip);
1049
1050 if (s > 0 && s < MAXSESSION && session[s].opened)
1051 return s;
1052
1053 return 0;
1054 }
1055
1056 //
1057 // Take an IP address in HOST byte order and
1058 // add it to the sessionid by IP cache.
1059 //
1060 // (It's actually cached in network order)
1061 //
1062 static void cache_ipmap(in_addr_t ip, sessionidt s)
1063 {
1064 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1065 uint8_t *a = (uint8_t *) &nip;
1066 union iphash *h = ip_hash;
1067 int i;
1068
1069 for (i = 0; i < 3; i++)
1070 {
1071 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1072 return;
1073
1074 h = h[a[i]].idx;
1075 }
1076
1077 h[a[3]].sess = s;
1078
1079 if (s > 0)
1080 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1081
1082 else if (s == 0)
1083 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1084 // else a map to an ip pool index.
1085 }
1086
1087 static void uncache_ipmap(in_addr_t ip)
1088 {
1089 cache_ipmap(ip, 0); // Assign it to the NULL session.
1090 }
1091
1092 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1093 {
1094 int i;
1095 int niblles;
1096 struct ipv6radix *curnode;
1097 char ipv6addr[INET6_ADDRSTRLEN];
1098
1099 curnode = &ipv6_hash[((ip.s6_addr[0]) & 0xF0)>>4];
1100
1101 niblles = prefixlen >> 2;
1102 i = 1;
1103
1104 while (i < niblles)
1105 {
1106 if (curnode->branch == NULL)
1107 {
1108 if (!(curnode->branch = calloc(16, sizeof (struct ipv6radix))))
1109 return;
1110 }
1111
1112 if (i & 1)
1113 curnode = &curnode->branch[ip.s6_addr[i>>1] & 0x0F];
1114 else
1115 curnode = &curnode->branch[(ip.s6_addr[i>>1] & 0xF0)>>4];
1116
1117 i++;
1118 }
1119
1120 curnode->sess = s;
1121
1122 if (s > 0)
1123 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1124 inet_ntop(AF_INET6, &ip, ipv6addr,
1125 INET6_ADDRSTRLEN),
1126 prefixlen);
1127 else if (s == 0)
1128 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1129 inet_ntop(AF_INET6, &ip, ipv6addr,
1130 INET6_ADDRSTRLEN),
1131 prefixlen);
1132 }
1133
1134 //
1135 // CLI list to dump current ipcache.
1136 //
1137 int cmd_show_ipcache(struct cli_def *cli, const char *command, char **argv, int argc)
1138 {
1139 union iphash *d = ip_hash, *e, *f, *g;
1140 int i, j, k, l;
1141 int count = 0;
1142
1143 if (CLI_HELP_REQUESTED)
1144 return CLI_HELP_NO_ARGS;
1145
1146 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1147
1148 for (i = 0; i < 256; ++i)
1149 {
1150 if (!d[i].idx)
1151 continue;
1152
1153 e = d[i].idx;
1154 for (j = 0; j < 256; ++j)
1155 {
1156 if (!e[j].idx)
1157 continue;
1158
1159 f = e[j].idx;
1160 for (k = 0; k < 256; ++k)
1161 {
1162 if (!f[k].idx)
1163 continue;
1164
1165 g = f[k].idx;
1166 for (l = 0; l < 256; ++l)
1167 {
1168 if (!g[l].sess)
1169 continue;
1170
1171 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1172 ++count;
1173 }
1174 }
1175 }
1176 }
1177 cli_print(cli, "%d entries in cache", count);
1178 return CLI_OK;
1179 }
1180
1181 // Find session by username, 0 for not found
1182 // walled garden users aren't authenticated, so the username is
1183 // reasonably useless. Ignore them to avoid incorrect actions
1184 //
1185 // This is VERY inefficent. Don't call it often. :)
1186 //
1187 sessionidt sessionbyuser(char *username)
1188 {
1189 int s;
1190 CSTAT(sessionbyuser);
1191
1192 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1193 {
1194 if (!session[s].opened)
1195 continue;
1196
1197 if (session[s].walled_garden)
1198 continue; // Skip walled garden users.
1199
1200 if (!strncmp(session[s].user, username, 128))
1201 return s;
1202
1203 }
1204 return 0; // Not found.
1205 }
1206
1207 void send_garp(in_addr_t ip)
1208 {
1209 int s;
1210 struct ifreq ifr;
1211 uint8_t mac[6];
1212
1213 s = socket(PF_INET, SOCK_DGRAM, 0);
1214 if (s < 0)
1215 {
1216 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1217 return;
1218 }
1219 memset(&ifr, 0, sizeof(ifr));
1220 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1221 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1222 {
1223 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1224 close(s);
1225 return;
1226 }
1227 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1228 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1229 {
1230 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1231 close(s);
1232 return;
1233 }
1234 close(s);
1235 sendarp(ifr.ifr_ifindex, mac, ip);
1236 }
1237
1238 static sessiont *sessiontbysessionidt(sessionidt s)
1239 {
1240 if (!s || s >= MAXSESSION) return NULL;
1241 return &session[s];
1242 }
1243
1244 static sessionidt sessionidtbysessiont(sessiont *s)
1245 {
1246 sessionidt val = s-session;
1247 if (s < session || val >= MAXSESSION) return 0;
1248 return val;
1249 }
1250
1251 // actually send a control message for a specific tunnel
1252 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1253 {
1254 struct sockaddr_in addr;
1255
1256 CSTAT(tunnelsend);
1257
1258 if (!t)
1259 {
1260 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1261 STAT(tunnel_tx_errors);
1262 return;
1263 }
1264
1265 if (t == TUNNEL_ID_PPPOE)
1266 {
1267 pppoe_sess_send(buf, l, t);
1268 return;
1269 }
1270
1271 if (!tunnel[t].ip)
1272 {
1273 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1274 STAT(tunnel_tx_errors);
1275 return;
1276 }
1277
1278 memset(&addr, 0, sizeof(addr));
1279 addr.sin_family = AF_INET;
1280 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1281 addr.sin_port = htons(tunnel[t].port);
1282
1283 // sequence expected, if sequence in message
1284 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1285
1286 // If this is a control message, deal with retries
1287 if (*buf & 0x80)
1288 {
1289 tunnel[t].last = time_now; // control message sent
1290 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1291 if (tunnel[t].try)
1292 {
1293 STAT(tunnel_retries);
1294 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1295 }
1296 }
1297
1298 if (sendto(udpfd[tunnel[t].indexudp], buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1299 {
1300 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1301 strerror(errno), udpfd[tunnel[t].indexudp], buf, l, inet_ntoa(addr.sin_addr));
1302 STAT(tunnel_tx_errors);
1303 return;
1304 }
1305
1306 LOG_HEX(5, "Send Tunnel Data", buf, l);
1307 STAT(tunnel_tx_packets);
1308 INC_STAT(tunnel_tx_bytes, l);
1309 }
1310
1311 //
1312 // Tiny helper function to write data to
1313 // the 'tun' device.
1314 //
1315 int tun_write(uint8_t * data, int size)
1316 {
1317 return write(tunfd, data, size);
1318 }
1319
1320 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1321 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1322 {
1323 int d = (tcp[12] >> 4) * 4;
1324 uint8_t *mss = 0;
1325 uint8_t *opts;
1326 uint8_t *data;
1327 uint16_t orig;
1328 uint32_t sum;
1329
1330 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1331 return;
1332
1333 if (tcp + d > buf + len) // short?
1334 return;
1335
1336 opts = tcp + 20;
1337 data = tcp + d;
1338
1339 while (opts < data)
1340 {
1341 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1342 {
1343 mss = opts + 2;
1344 if (mss + 2 > data) return; // short?
1345 break;
1346 }
1347
1348 if (*opts == 0) return; // end of options
1349 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1350 opts++;
1351 else
1352 opts += opts[1]; // skip over option
1353 }
1354
1355 if (!mss) return; // not found
1356 orig = ntohs(*(uint16_t *) mss);
1357
1358 if (orig <= MSS) return; // mss OK
1359
1360 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1361 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1362 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1363 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1364
1365 // set mss
1366 *(int16_t *) mss = htons(MSS);
1367
1368 // adjust checksum (see rfc1141)
1369 sum = orig + (~MSS & 0xffff);
1370 sum += ntohs(*(uint16_t *) (tcp + 16));
1371 sum = (sum & 0xffff) + (sum >> 16);
1372 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1373 }
1374
1375 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1376 {
1377 uint16_t proto;
1378 if (extra) {
1379 // Skip the four extra bytes
1380 p += 4;
1381 l -= 4;
1382 }
1383
1384 if (*p & 1)
1385 {
1386 proto = *p++;
1387 l--;
1388 }
1389 else
1390 {
1391 proto = ntohs(*(uint16_t *) p);
1392 p += 2;
1393 l -= 2;
1394 }
1395 if (proto == PPPIP)
1396 {
1397 if (session[s].die)
1398 {
1399 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1400 return; // closing session, PPP not processed
1401 }
1402 session[s].last_packet = session[s].last_data = time_now;
1403 processipin(s, t, p, l);
1404 }
1405 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1406 {
1407 if (session[s].die)
1408 {
1409 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1410 return; // closing session, PPP not processed
1411 }
1412
1413 session[s].last_packet = session[s].last_data = time_now;
1414 processipv6in(s, t, p, l);
1415 }
1416 else if (proto == PPPIPCP)
1417 {
1418 session[s].last_packet = session[s].last_data = time_now;
1419 processipcp(s, t, p, l);
1420 }
1421 else if (proto == PPPCCP)
1422 {
1423 session[s].last_packet = session[s].last_data = time_now;
1424 processccp(s, t, p, l);
1425 }
1426 else
1427 {
1428 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1429 }
1430 }
1431
1432 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1433 {
1434 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1435 sp->cout_delta += len;
1436 sp->pout++;
1437 sp->last_data = time_now;
1438
1439 sess_local[s].cout += len; // To send to master..
1440 sess_local[s].pout++;
1441 }
1442
1443 // process outgoing (to tunnel) IP
1444 //
1445 // (i.e. this routine writes to data[-8]).
1446 void processipout(uint8_t *buf, int len)
1447 {
1448 sessionidt s;
1449 sessiont *sp;
1450 tunnelidt t;
1451 in_addr_t ip, ip_src;
1452
1453 uint8_t *data = buf; // Keep a copy of the originals.
1454 int size = len;
1455
1456 uint8_t fragbuf[MAXETHER + 20];
1457
1458 CSTAT(processipout);
1459
1460 if (len < MIN_IP_SIZE)
1461 {
1462 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1463 STAT(tun_rx_errors);
1464 return;
1465 }
1466 if (len >= MAXETHER)
1467 {
1468 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1469 STAT(tun_rx_errors);
1470 return;
1471 }
1472
1473 // Skip the tun header
1474 buf += 4;
1475 len -= 4;
1476
1477 // Got an IP header now
1478 if (*(uint8_t *)(buf) >> 4 != 4)
1479 {
1480 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1481 return;
1482 }
1483
1484 ip_src = *(uint32_t *)(buf + 12);
1485 ip = *(uint32_t *)(buf + 16);
1486 if (!(s = sessionbyip(ip)))
1487 {
1488 // Is this a packet for a session that doesn't exist?
1489 static int rate = 0; // Number of ICMP packets we've sent this second.
1490 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1491
1492 if (last != time_now)
1493 {
1494 last = time_now;
1495 rate = 0;
1496 }
1497
1498 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1499 {
1500 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1501 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1502 config->bind_address ? config->bind_address : my_address, buf, len);
1503 }
1504 return;
1505 }
1506
1507 t = session[s].tunnel;
1508 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1509 {
1510 LOG(3, s, t, "Packet size more than session MRU\n");
1511 return;
1512 }
1513
1514 sp = &session[s];
1515
1516 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1517 if (config->max_packets > 0)
1518 {
1519 if (sess_local[s].last_packet_out == TIME)
1520 {
1521 int max = config->max_packets;
1522
1523 // All packets for throttled sessions are handled by the
1524 // master, so further limit by using the throttle rate.
1525 // A bit of a kludge, since throttle rate is in kbps,
1526 // but should still be generous given our average DSL
1527 // packet size is 200 bytes: a limit of 28kbps equates
1528 // to around 180 packets per second.
1529 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1530 max = sp->throttle_out;
1531
1532 if (++sess_local[s].packets_out > max)
1533 {
1534 sess_local[s].packets_dropped++;
1535 return;
1536 }
1537 }
1538 else
1539 {
1540 if (sess_local[s].packets_dropped)
1541 {
1542 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1543 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1544 sess_local[s].packets_dropped, sess_local[s].packets_out,
1545 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1546 sp->user);
1547 }
1548
1549 sess_local[s].last_packet_out = TIME;
1550 sess_local[s].packets_out = 1;
1551 sess_local[s].packets_dropped = 0;
1552 }
1553 }
1554
1555 // run access-list if any
1556 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1557 return;
1558
1559 // adjust MSS on SYN and SYN,ACK packets with options
1560 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1561 {
1562 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1563 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1564 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1565 }
1566
1567 if (sp->tbf_out)
1568 {
1569 if (!config->no_throttle_local_IP || !sessionbyip(ip_src))
1570 {
1571 // Are we throttling this session?
1572 if (config->cluster_iam_master)
1573 tbf_queue_packet(sp->tbf_out, data, size);
1574 else
1575 master_throttle_packet(sp->tbf_out, data, size);
1576 return;
1577 }
1578 }
1579
1580 if (sp->walled_garden && !config->cluster_iam_master)
1581 {
1582 // We are walled-gardening this
1583 master_garden_packet(s, data, size);
1584 return;
1585 }
1586
1587 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1588 {
1589
1590 if (!config->cluster_iam_master)
1591 {
1592 // The MPPP packets must be managed by the Master.
1593 master_forward_mppp_packet(s, data, size);
1594 return;
1595 }
1596
1597 // Add on L2TP header
1598 sessionidt members[MAXBUNDLESES];
1599 bundleidt bid = session[s].bundle;
1600 bundlet *b = &bundle[bid];
1601 uint32_t num_of_links, nb_opened;
1602 int i;
1603
1604 num_of_links = b->num_of_links;
1605 nb_opened = 0;
1606 for (i = 0;i < num_of_links;i++)
1607 {
1608 s = b->members[i];
1609 if (session[s].ppp.lcp == Opened)
1610 {
1611 members[nb_opened] = s;
1612 nb_opened++;
1613 }
1614 }
1615
1616 if (nb_opened < 1)
1617 {
1618 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1619 return;
1620 }
1621
1622 num_of_links = nb_opened;
1623 b->current_ses = (b->current_ses + 1) % num_of_links;
1624 s = members[b->current_ses];
1625 t = session[s].tunnel;
1626 sp = &session[s];
1627 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1628
1629 if (num_of_links > 1)
1630 {
1631 if(len > MINFRAGLEN)
1632 {
1633 //for rotate traffic among the member links
1634 uint32_t divisor = num_of_links;
1635 if (divisor > 2)
1636 divisor = divisor/2 + (divisor & 1);
1637
1638 // Partition the packet to "num_of_links" fragments
1639 uint32_t fraglen = len / divisor;
1640 uint32_t last_fraglen = fraglen + len % divisor;
1641 uint32_t remain = len;
1642
1643 // send the first packet
1644 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1645 if (!p) return;
1646 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1647
1648 // statistics
1649 update_session_out_stat(s, sp, fraglen);
1650
1651 remain -= fraglen;
1652 while (remain > last_fraglen)
1653 {
1654 b->current_ses = (b->current_ses + 1) % num_of_links;
1655 s = members[b->current_ses];
1656 t = session[s].tunnel;
1657 sp = &session[s];
1658 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1659 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1660 if (!p) return;
1661 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1662 update_session_out_stat(s, sp, fraglen);
1663 remain -= fraglen;
1664 }
1665 // send the last fragment
1666 b->current_ses = (b->current_ses + 1) % num_of_links;
1667 s = members[b->current_ses];
1668 t = session[s].tunnel;
1669 sp = &session[s];
1670 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1671 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1672 if (!p) return;
1673 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1674 update_session_out_stat(s, sp, remain);
1675 if (remain != last_fraglen)
1676 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1677 }
1678 else
1679 {
1680 // Send it as one frame
1681 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1682 if (!p) return;
1683 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1684 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1685 update_session_out_stat(s, sp, len);
1686 }
1687 }
1688 else
1689 {
1690 // Send it as one frame (NO MPPP Frame)
1691 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1692 tunnelsend(p, len + (buf-p), t); // send it...
1693 update_session_out_stat(s, sp, len);
1694 }
1695 }
1696 else
1697 {
1698 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1699 tunnelsend(p, len + (buf-p), t); // send it...
1700 update_session_out_stat(s, sp, len);
1701 }
1702
1703 // Snooping this session, send it to intercept box
1704 if (sp->snoop_ip && sp->snoop_port)
1705 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1706
1707 udp_tx += len;
1708 }
1709
1710 // process outgoing (to tunnel) IPv6
1711 //
1712 static void processipv6out(uint8_t * buf, int len)
1713 {
1714 sessionidt s;
1715 sessiont *sp;
1716 tunnelidt t;
1717 struct in6_addr ip6;
1718
1719 uint8_t *data = buf; // Keep a copy of the originals.
1720 int size = len;
1721
1722 uint8_t b[MAXETHER + 20];
1723
1724 CSTAT(processipv6out);
1725
1726 if (len < MIN_IP_SIZE)
1727 {
1728 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1729 STAT(tunnel_tx_errors);
1730 return;
1731 }
1732 if (len >= MAXETHER)
1733 {
1734 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1735 STAT(tunnel_tx_errors);
1736 return;
1737 }
1738
1739 // Skip the tun header
1740 buf += 4;
1741 len -= 4;
1742
1743 // Got an IP header now
1744 if (*(uint8_t *)(buf) >> 4 != 6)
1745 {
1746 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1747 return;
1748 }
1749
1750 ip6 = *(struct in6_addr *)(buf+24);
1751 s = sessionbyipv6(ip6);
1752
1753 if (s == 0)
1754 {
1755 s = sessionbyipv6new(ip6);
1756 }
1757
1758 if (s == 0)
1759 {
1760 // Is this a packet for a session that doesn't exist?
1761 static int rate = 0; // Number of ICMP packets we've sent this second.
1762 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1763
1764 if (last != time_now)
1765 {
1766 last = time_now;
1767 rate = 0;
1768 }
1769
1770 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1771 {
1772 // FIXME: Should send icmp6 host unreachable
1773 }
1774 return;
1775 }
1776 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1777 {
1778 bundleidt bid = session[s].bundle;
1779 bundlet *b = &bundle[bid];
1780
1781 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1782 s = b->members[b->current_ses];
1783 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1784 }
1785 t = session[s].tunnel;
1786 sp = &session[s];
1787 sp->last_data = time_now;
1788
1789 // FIXME: add DoS prevention/filters?
1790
1791 if (sp->tbf_out)
1792 {
1793 // Are we throttling this session?
1794 if (config->cluster_iam_master)
1795 tbf_queue_packet(sp->tbf_out, data, size);
1796 else
1797 master_throttle_packet(sp->tbf_out, data, size);
1798 return;
1799 }
1800 else if (sp->walled_garden && !config->cluster_iam_master)
1801 {
1802 // We are walled-gardening this
1803 master_garden_packet(s, data, size);
1804 return;
1805 }
1806
1807 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1808
1809 // Add on L2TP header
1810 {
1811 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1812 if (!p) return;
1813 tunnelsend(b, len + (p-b), t); // send it...
1814 }
1815
1816 // Snooping this session, send it to intercept box
1817 if (sp->snoop_ip && sp->snoop_port)
1818 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1819
1820 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1821 sp->cout_delta += len;
1822 sp->pout++;
1823 udp_tx += len;
1824
1825 sess_local[s].cout += len; // To send to master..
1826 sess_local[s].pout++;
1827 }
1828
1829 //
1830 // Helper routine for the TBF filters.
1831 // Used to send queued data in to the user!
1832 //
1833 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1834 {
1835 sessiont *sp;
1836 tunnelidt t;
1837 uint8_t *p;
1838 uint8_t *data = buf; // Keep a copy of the originals.
1839
1840 uint8_t b[MAXETHER + 20];
1841
1842 if (len < 0 || len > MAXETHER)
1843 {
1844 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1845 return;
1846 }
1847
1848 // Skip the tun header
1849 buf += 4;
1850 len -= 4;
1851
1852 if (!session[s].ip)
1853 return;
1854
1855 t = session[s].tunnel;
1856 sp = &session[s];
1857
1858 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1859
1860 // Add on L2TP header
1861 if (*(uint16_t *) (data + 2) == htons(PKTIPV6))
1862 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0); // IPV6
1863 else
1864 p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0); // IPV4
1865
1866 if (!p) return;
1867
1868 tunnelsend(b, len + (p-b), t); // send it...
1869
1870 // Snooping this session.
1871 if (sp->snoop_ip && sp->snoop_port)
1872 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1873
1874 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1875 sp->cout_delta += len;
1876 sp->pout++;
1877 udp_tx += len;
1878
1879 sess_local[s].cout += len; // To send to master..
1880 sess_local[s].pout++;
1881 }
1882
1883 // add an AVP (16 bit)
1884 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1885 {
1886 uint16_t l = (m ? 0x8008 : 0x0008);
1887 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1888 pint16[0] = htons(l);
1889 pint16[1] = htons(0);
1890 pint16[2] = htons(avp);
1891 pint16[3] = htons(val);
1892 c->length += 8;
1893 }
1894
1895 // add an AVP (32 bit)
1896 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1897 {
1898 uint16_t l = (m ? 0x800A : 0x000A);
1899 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1900 uint32_t *pint32 = (uint32_t *) (c->buf + c->length + 6);
1901 pint16[0] = htons(l);
1902 pint16[1] = htons(0);
1903 pint16[2] = htons(avp);
1904 pint32[0] = htonl(val);
1905 c->length += 10;
1906 }
1907
1908 // add an AVP (string)
1909 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1910 {
1911 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1912 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1913 pint16[0] = htons(l);
1914 pint16[1] = htons(0);
1915 pint16[2] = htons(avp);
1916 memcpy(c->buf + c->length + 6, val, strlen(val));
1917 c->length += 6 + strlen(val);
1918 }
1919
1920 // add a binary AVP
1921 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1922 {
1923 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1924 uint16_t *pint16 = (uint16_t *) (c->buf + c->length + 0);
1925 pint16[0] = htons(l);
1926 pint16[1] = htons(0);
1927 pint16[2] = htons(avp);
1928 memcpy(c->buf + c->length + 6, val, len);
1929 c->length += 6 + len;
1930 }
1931
1932 // new control connection
1933 static controlt *controlnew(uint16_t mtype)
1934 {
1935 controlt *c;
1936 if (!controlfree)
1937 c = malloc(sizeof(controlt));
1938 else
1939 {
1940 c = controlfree;
1941 controlfree = c->next;
1942 }
1943 assert(c);
1944 c->next = 0;
1945 c->buf[0] = 0xC8; // flags
1946 c->buf[1] = 0x02; // ver
1947 c->length = 12;
1948 control16(c, 0, mtype, 1);
1949 return c;
1950 }
1951
1952 // send zero block if nothing is waiting
1953 // (ZLB send).
1954 static void controlnull(tunnelidt t)
1955 {
1956 uint16_t buf[6];
1957 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1958 return;
1959
1960 buf[0] = htons(0xC802); // flags/ver
1961 buf[1] = htons(12); // length
1962 buf[2] = htons(tunnel[t].far); // tunnel
1963 buf[3] = htons(0); // session
1964 buf[4] = htons(tunnel[t].ns); // sequence
1965 buf[5] = htons(tunnel[t].nr); // sequence
1966 tunnelsend((uint8_t *)buf, 12, t);
1967 }
1968
1969 // add a control message to a tunnel, and send if within window
1970 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1971 {
1972 uint16_t *pint16 = (uint16_t *) (c->buf + 2);
1973 pint16[0] = htons(c->length); // length
1974 pint16[1] = htons(tunnel[t].far); // tunnel
1975 pint16[2] = htons(far); // session
1976 pint16[3] = htons(tunnel[t].ns); // sequence
1977 tunnel[t].ns++; // advance sequence
1978 // link in message in to queue
1979 if (tunnel[t].controlc)
1980 tunnel[t].controle->next = c;
1981 else
1982 tunnel[t].controls = c;
1983
1984 tunnel[t].controle = c;
1985 tunnel[t].controlc++;
1986
1987 // send now if space in window
1988 if (tunnel[t].controlc <= tunnel[t].window)
1989 {
1990 tunnel[t].try = 0; // first send
1991 tunnelsend(c->buf, c->length, t);
1992 }
1993 }
1994
1995 //
1996 // Throttle or Unthrottle a session
1997 //
1998 // Throttle the data from/to through a session to no more than
1999 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
2000 // user).
2001 //
2002 // If either value is -1, the current value is retained for that
2003 // direction.
2004 //
2005 void throttle_session(sessionidt s, int rate_in, int rate_out)
2006 {
2007 if (!session[s].opened)
2008 return; // No-one home.
2009
2010 if (!*session[s].user)
2011 return; // User not logged in
2012
2013 if (rate_in >= 0)
2014 {
2015 int bytes = rate_in * 1024 / 8; // kbits to bytes
2016 if (session[s].tbf_in)
2017 free_tbf(session[s].tbf_in);
2018
2019 if (rate_in > 0)
2020 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
2021 else
2022 session[s].tbf_in = 0;
2023
2024 session[s].throttle_in = rate_in;
2025 }
2026
2027 if (rate_out >= 0)
2028 {
2029 int bytes = rate_out * 1024 / 8;
2030 if (session[s].tbf_out)
2031 free_tbf(session[s].tbf_out);
2032
2033 if (rate_out > 0)
2034 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
2035 else
2036 session[s].tbf_out = 0;
2037
2038 session[s].throttle_out = rate_out;
2039 }
2040 }
2041
2042 // add/remove filters from session (-1 = no change)
2043 void filter_session(sessionidt s, int filter_in, int filter_out)
2044 {
2045 if (!session[s].opened)
2046 return; // No-one home.
2047
2048 if (!*session[s].user)
2049 return; // User not logged in
2050
2051 // paranoia
2052 if (filter_in > MAXFILTER) filter_in = -1;
2053 if (filter_out > MAXFILTER) filter_out = -1;
2054 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
2055 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
2056
2057 if (filter_in >= 0)
2058 {
2059 if (session[s].filter_in)
2060 ip_filters[session[s].filter_in - 1].used--;
2061
2062 if (filter_in > 0)
2063 ip_filters[filter_in - 1].used++;
2064
2065 session[s].filter_in = filter_in;
2066 }
2067
2068 if (filter_out >= 0)
2069 {
2070 if (session[s].filter_out)
2071 ip_filters[session[s].filter_out - 1].used--;
2072
2073 if (filter_out > 0)
2074 ip_filters[filter_out - 1].used++;
2075
2076 session[s].filter_out = filter_out;
2077 }
2078 }
2079
2080 // start tidy shutdown of session
2081 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2082 {
2083 int walled_garden = session[s].walled_garden;
2084 bundleidt b = session[s].bundle;
2085 //delete routes only for last session in bundle (in case of MPPP)
2086 int del_routes = !b || (bundle[b].num_of_links == 1);
2087
2088 CSTAT(sessionshutdown);
2089
2090 if (!session[s].opened)
2091 {
2092 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2093 return; // not a live session
2094 }
2095
2096 if (!session[s].die)
2097 {
2098 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2099 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2100 run_plugins(PLUGIN_KILL_SESSION, &data);
2101 }
2102
2103 if (session[s].ip && !walled_garden && !session[s].die)
2104 {
2105 // RADIUS Stop message
2106 uint16_t r = radiusnew(s);
2107 if (r)
2108 {
2109 // stop, if not already trying
2110 if (radius[r].state != RADIUSSTOP)
2111 {
2112 radius[r].term_cause = term_cause;
2113 radius[r].term_msg = reason;
2114 radiussend(r, RADIUSSTOP);
2115 }
2116 }
2117 else
2118 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2119
2120 // Save counters to dump to accounting file
2121 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2122 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2123 }
2124
2125 if (!session[s].die)
2126 session[s].die = TIME + 150; // Clean up in 15 seconds
2127
2128 if (session[s].ip)
2129 { // IP allocated, clear and unroute
2130 int r;
2131 int routed = 0;
2132 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2133 {
2134 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2135 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2136 routed++;
2137
2138 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2139 session[s].route[r].ip = 0;
2140 }
2141
2142 if (session[s].ip_pool_index == -1) // static ip
2143 {
2144 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2145 session[s].ip = 0;
2146 }
2147 else
2148 free_ip_address(s);
2149
2150 // unroute IPv6, if setup
2151 for (r = 0; r < MAXROUTE6 && session[s].route6[r].ipv6route.s6_addr[0] && session[s].route6[r].ipv6prefixlen; r++)
2152 {
2153 if (del_routes) route6set(s, session[s].route6[r].ipv6route, session[s].route6[r].ipv6prefixlen, 0);
2154 memset(&session[s].route6[r], 0, sizeof(session[s].route6[r]));
2155 }
2156
2157 if (session[s].ipv6address.s6_addr[0] && del_routes)
2158 {
2159 route6set(s, session[s].ipv6address, 128, 0);
2160 }
2161
2162 if (b)
2163 {
2164 // This session was part of a bundle
2165 bundle[b].num_of_links--;
2166 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2167 if(bundle[b].num_of_links == 0)
2168 {
2169 bundleclear(b);
2170 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2171 }
2172 else
2173 {
2174 // Adjust the members array to accomodate the new change
2175 uint8_t mem_num = 0;
2176 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2177 if(bundle[b].members[bundle[b].num_of_links] != s)
2178 {
2179 uint8_t ml;
2180 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2181 if(bundle[b].members[ml] == s)
2182 {
2183 mem_num = ml;
2184 break;
2185 }
2186 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2187 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2188
2189 // If the killed session is the first of the bundle,
2190 // the new first session must be stored in the cache_ipmap
2191 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2192 if (mem_num == 0)
2193 {
2194 sessionidt new_s = bundle[b].members[0];
2195
2196 routed = 0;
2197 // Add the route for this session.
2198 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2199 {
2200 int i, prefixlen;
2201 in_addr_t ip;
2202
2203 prefixlen = session[new_s].route[r].prefixlen;
2204 ip = session[new_s].route[r].ip;
2205
2206 if (!prefixlen) prefixlen = 32;
2207 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2208
2209 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2210 cache_ipmap(i, new_s);
2211 }
2212 cache_ipmap(session[new_s].ip, new_s);
2213
2214 // IPV6 route
2215 for (r = 0; r < MAXROUTE6 && session[new_s].route6[r].ipv6prefixlen; r++)
2216 {
2217 cache_ipv6map(session[new_s].route6[r].ipv6route, session[new_s].route6[r].ipv6prefixlen, new_s);
2218 }
2219
2220 if (session[new_s].ipv6address.s6_addr[0])
2221 {
2222 cache_ipv6map(session[new_s].ipv6address, 128, new_s);
2223 }
2224 }
2225 }
2226 }
2227
2228 cluster_send_bundle(b);
2229 }
2230 }
2231
2232 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2233 throttle_session(s, 0, 0);
2234
2235 if (cdn_result)
2236 {
2237 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2238 {
2239 pppoe_shutdown_session(s);
2240 }
2241 else
2242 {
2243 // Send CDN
2244 controlt *c = controlnew(14); // sending CDN
2245 if (cdn_error)
2246 {
2247 uint16_t buf[2];
2248 buf[0] = htons(cdn_result);
2249 buf[1] = htons(cdn_error);
2250 controlb(c, 1, (uint8_t *)buf, 4, 1);
2251 }
2252 else
2253 control16(c, 1, cdn_result, 1);
2254
2255 control16(c, 14, s, 1); // assigned session (our end)
2256 controladd(c, session[s].far, session[s].tunnel); // send the message
2257 }
2258 }
2259
2260 // update filter refcounts
2261 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2262 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2263
2264 // clear PPP state
2265 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2266 sess_local[s].lcp.restart = 0;
2267 sess_local[s].ipcp.restart = 0;
2268 sess_local[s].ipv6cp.restart = 0;
2269 sess_local[s].ccp.restart = 0;
2270
2271 cluster_send_session(s);
2272 }
2273
2274 void sendipcp(sessionidt s, tunnelidt t)
2275 {
2276 uint8_t buf[MAXETHER];
2277 uint8_t *q;
2278
2279 CSTAT(sendipcp);
2280 LOG(3, s, t, "IPCP: send ConfigReq\n");
2281
2282 if (!session[s].unique_id)
2283 {
2284 if (!++last_id) ++last_id; // skip zero
2285 session[s].unique_id = last_id;
2286 }
2287
2288 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2289 if (!q) return;
2290
2291 *q = ConfigReq;
2292 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2293 *(uint16_t *) (q + 2) = htons(10); // packet length
2294 q[4] = 3; // ip address option
2295 q[5] = 6; // option length
2296 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2297 config->iftun_n_address[tunnel[t].indexudp] ? config->iftun_n_address[tunnel[t].indexudp] :
2298 my_address; // send my IP
2299
2300 tunnelsend(buf, 10 + (q - buf), t); // send it
2301 restart_timer(s, ipcp);
2302 }
2303
2304 void sendipv6cp(sessionidt s, tunnelidt t)
2305 {
2306 uint8_t buf[MAXETHER];
2307 uint8_t *q;
2308
2309 CSTAT(sendipv6cp);
2310 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2311
2312 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2313 if (!q) return;
2314
2315 *q = ConfigReq;
2316 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2317 // only send one type
2318 // of request
2319 *(uint16_t *) (q + 2) = htons(14);
2320 q[4] = 1; // interface identifier option
2321 q[5] = 10; // option length
2322 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2323 *(uint32_t *) (q + 10) = 0;
2324 q[13] = 1;
2325
2326 tunnelsend(buf, 14 + (q - buf), t); // send it
2327 restart_timer(s, ipv6cp);
2328 }
2329
2330 static void sessionclear(sessionidt s)
2331 {
2332 memset(&session[s], 0, sizeof(session[s]));
2333 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2334 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2335
2336 session[s].tunnel = T_FREE; // Mark it as free.
2337 session[s].next = sessionfree;
2338 sessionfree = s;
2339 }
2340
2341 // kill a session now
2342 void sessionkill(sessionidt s, char *reason)
2343 {
2344 CSTAT(sessionkill);
2345
2346 if (!session[s].opened) // not alive
2347 return;
2348
2349 if (session[s].next)
2350 {
2351 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2352 return;
2353 }
2354
2355 if (!session[s].die)
2356 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2357
2358 if (sess_local[s].radius)
2359 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2360
2361 if (session[s].forwardtosession)
2362 {
2363 sessionidt sess = session[s].forwardtosession;
2364 if (session[sess].forwardtosession == s)
2365 {
2366 // Shutdown the linked session also.
2367 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2368 }
2369 }
2370
2371 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2372 sessionclear(s);
2373 cluster_send_session(s);
2374 }
2375
2376 static void tunnelclear(tunnelidt t)
2377 {
2378 if (!t) return;
2379 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2380 tunnel[t].state = TUNNELFREE;
2381 }
2382
2383 static void bundleclear(bundleidt b)
2384 {
2385 if (!b) return;
2386 memset(&bundle[b], 0, sizeof(bundle[b]));
2387 bundle[b].state = BUNDLEFREE;
2388 }
2389
2390 // kill a tunnel now
2391 static void tunnelkill(tunnelidt t, char *reason)
2392 {
2393 sessionidt s;
2394 controlt *c;
2395
2396 CSTAT(tunnelkill);
2397
2398 tunnel[t].state = TUNNELDIE;
2399
2400 // free control messages
2401 while ((c = tunnel[t].controls))
2402 {
2403 controlt * n = c->next;
2404 tunnel[t].controls = n;
2405 tunnel[t].controlc--;
2406 c->next = controlfree;
2407 controlfree = c;
2408 }
2409 // kill sessions
2410 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2411 if (session[s].tunnel == t)
2412 sessionkill(s, reason);
2413
2414 // free tunnel
2415 tunnelclear(t);
2416 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2417 cli_tunnel_actions[t].action = 0;
2418 cluster_send_tunnel(t);
2419 }
2420
2421 // shut down a tunnel cleanly
2422 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2423 {
2424 sessionidt s;
2425
2426 CSTAT(tunnelshutdown);
2427
2428 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2429 {
2430 // never set up, can immediately kill
2431 tunnelkill(t, reason);
2432 return;
2433 }
2434 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2435
2436 // close session
2437 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2438 if (session[s].tunnel == t)
2439 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2440
2441 tunnel[t].state = TUNNELDIE;
2442 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2443 cluster_send_tunnel(t);
2444 // TBA - should we wait for sessions to stop?
2445 if (result)
2446 {
2447 controlt *c = controlnew(4); // sending StopCCN
2448 if (error)
2449 {
2450 uint16_t buf[32];
2451 int l = 4;
2452 buf[0] = htons(result);
2453 buf[1] = htons(error);
2454 if (msg)
2455 {
2456 int m = strlen(msg);
2457 if (m + 4 > sizeof(buf))
2458 m = sizeof(buf) - 4;
2459
2460 memcpy(buf+2, msg, m);
2461 l += m;
2462 }
2463
2464 controlb(c, 1, (uint8_t *)buf, l, 1);
2465 }
2466 else
2467 control16(c, 1, result, 1);
2468
2469 control16(c, 9, t, 1); // assigned tunnel (our end)
2470 controladd(c, 0, t); // send the message
2471 }
2472 }
2473
2474 // read and process packet on tunnel (UDP)
2475 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd)
2476 {
2477 uint8_t *sendchalresponse = NULL;
2478 uint8_t *recvchalresponse = NULL;
2479 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2480 uint8_t *p = buf + 2;
2481
2482
2483 CSTAT(processudp);
2484
2485 udp_rx += len;
2486 udp_rx_pkt++;
2487 LOG_HEX(5, "UDP Data", buf, len);
2488 STAT(tunnel_rx_packets);
2489 INC_STAT(tunnel_rx_bytes, len);
2490 if (len < 6)
2491 {
2492 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2493 STAT(tunnel_rx_errors);
2494 return;
2495 }
2496 if ((buf[1] & 0x0F) != 2)
2497 {
2498 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2499 STAT(tunnel_rx_errors);
2500 return;
2501 }
2502 if (*buf & 0x40)
2503 { // length
2504 l = ntohs(*(uint16_t *) p);
2505 p += 2;
2506 }
2507 t = ntohs(*(uint16_t *) p);
2508 p += 2;
2509 s = ntohs(*(uint16_t *) p);
2510 p += 2;
2511 if (s >= MAXSESSION)
2512 {
2513 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2514 STAT(tunnel_rx_errors);
2515 return;
2516 }
2517 if (t >= MAXTUNNEL)
2518 {
2519 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2520 STAT(tunnel_rx_errors);
2521 return;
2522 }
2523 if (t == TUNNEL_ID_PPPOE)
2524 {
2525 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2526 STAT(tunnel_rx_errors);
2527 return;
2528 }
2529 if (*buf & 0x08)
2530 { // ns/nr
2531 ns = ntohs(*(uint16_t *) p);
2532 p += 2;
2533 nr = ntohs(*(uint16_t *) p);
2534 p += 2;
2535 }
2536 if (*buf & 0x02)
2537 { // offset
2538 uint16_t o = ntohs(*(uint16_t *) p);
2539 p += o + 2;
2540 }
2541 if ((p - buf) > l)
2542 {
2543 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2544 STAT(tunnel_rx_errors);
2545 return;
2546 }
2547 l -= (p - buf);
2548
2549 // used to time out old tunnels
2550 if (t && tunnel[t].state == TUNNELOPEN)
2551 tunnel[t].lastrec = time_now;
2552
2553 if (*buf & 0x80)
2554 { // control
2555 uint16_t message = 0xFFFF; // message type
2556 uint8_t fatal = 0;
2557 uint8_t mandatory = 0;
2558 uint16_t asession = 0; // assigned session
2559 uint32_t amagic = 0; // magic number
2560 uint8_t aflags = 0; // flags from last LCF
2561 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2562 char called[MAXTEL] = ""; // called number
2563 char calling[MAXTEL] = ""; // calling number
2564
2565 if (!config->cluster_iam_master)
2566 {
2567 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
2568 return;
2569 }
2570
2571 // control messages must have bits 0x80|0x40|0x08
2572 // (type, length and sequence) set, and bits 0x02|0x01
2573 // (offset and priority) clear
2574 if ((*buf & 0xCB) != 0xC8)
2575 {
2576 LOG(1, s, t, "Bad control header %02X\n", *buf);
2577 STAT(tunnel_rx_errors);
2578 return;
2579 }
2580
2581 // check for duplicate tunnel open message
2582 if (!t && ns == 0)
2583 {
2584 int i;
2585
2586 //
2587 // Is this a duplicate of the first packet? (SCCRQ)
2588 //
2589 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2590 {
2591 if (tunnel[i].state != TUNNELOPENING ||
2592 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2593 tunnel[i].port != ntohs(addr->sin_port) )
2594 continue;
2595 t = i;
2596 LOG(3, s, t, "Duplicate SCCRQ?\n");
2597 break;
2598 }
2599 }
2600
2601 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2602 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2603
2604 // if no tunnel specified, assign one
2605 if (!t)
2606 {
2607 if (!(t = new_tunnel()))
2608 {
2609 LOG(1, 0, 0, "No more tunnels\n");
2610 STAT(tunnel_overflow);
2611 return;
2612 }
2613 tunnelclear(t);
2614 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2615 tunnel[t].port = ntohs(addr->sin_port);
2616 tunnel[t].window = 4; // default window
2617 tunnel[t].indexudp = indexudpfd;
2618 STAT(tunnel_created);
2619 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2620 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2621 }
2622
2623 // If the 'ns' just received is not the 'nr' we're
2624 // expecting, just send an ack and drop it.
2625 //
2626 // if 'ns' is less, then we got a retransmitted packet.
2627 // if 'ns' is greater than missed a packet. Either way
2628 // we should ignore it.
2629 if (ns != tunnel[t].nr)
2630 {
2631 // is this the sequence we were expecting?
2632 STAT(tunnel_rx_errors);
2633 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2634 t, ns, tunnel[t].nr);
2635
2636 if (l) // Is this not a ZLB?
2637 controlnull(t);
2638 return;
2639 }
2640
2641 // check sequence of this message
2642 {
2643 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2644 // some to clear maybe?
2645 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2646 {
2647 controlt *c = tunnel[t].controls;
2648 tunnel[t].controls = c->next;
2649 tunnel[t].controlc--;
2650 c->next = controlfree;
2651 controlfree = c;
2652 skip--;
2653 tunnel[t].try = 0; // we have progress
2654 }
2655
2656 // receiver advance (do here so quoted correctly in any sends below)
2657 if (l) tunnel[t].nr = (ns + 1);
2658 if (skip < 0) skip = 0;
2659 if (skip < tunnel[t].controlc)
2660 {
2661 // some control packets can now be sent that were previous stuck out of window
2662 int tosend = tunnel[t].window - skip;
2663 controlt *c = tunnel[t].controls;
2664 while (c && skip)
2665 {
2666 c = c->next;
2667 skip--;
2668 }
2669 while (c && tosend)
2670 {
2671 tunnel[t].try = 0; // first send
2672 tunnelsend(c->buf, c->length, t);
2673 c = c->next;
2674 tosend--;
2675 }
2676 }
2677 if (!tunnel[t].controlc)
2678 tunnel[t].retry = 0; // caught up
2679 }
2680 if (l)
2681 { // if not a null message
2682 int result = 0;
2683 int error = 0;
2684 char *msg = 0;
2685
2686 // Default disconnect cause/message on receipt of CDN. Set to
2687 // more specific value from attribute 1 (result code) or 46
2688 // (disconnect cause) if present below.
2689 int disc_cause_set = 0;
2690 int disc_cause = TERM_NAS_REQUEST;
2691 char const *disc_reason = "Closed (Received CDN).";
2692
2693 // process AVPs
2694 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2695 {
2696 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2697 uint8_t *b = p;
2698 uint8_t flags = *p;
2699 uint16_t mtype;
2700
2701 if (n > l)
2702 {
2703 LOG(1, s, t, "Invalid length in AVP\n");
2704 STAT(tunnel_rx_errors);
2705 return;
2706 }
2707 p += n; // next
2708 l -= n;
2709 if (flags & 0x3C) // reserved bits, should be clear
2710 {
2711 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2712 fatal = flags;
2713 result = 2; // general error
2714 error = 3; // reserved field non-zero
2715 msg = 0;
2716 continue; // next
2717 }
2718 b += 2;
2719 if (*(uint16_t *) (b))
2720 {
2721 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2722 fatal = flags;
2723 result = 2; // general error
2724 error = 6; // generic vendor-specific error
2725 msg = "unsupported vendor-specific";
2726 continue; // next
2727 }
2728 b += 2;
2729 mtype = ntohs(*(uint16_t *) (b));
2730 b += 2;
2731 n -= 6;
2732
2733 if (flags & 0x40)
2734 {
2735 uint16_t orig_len;
2736
2737 // handle hidden AVPs
2738 if (!*config->l2tp_secret)
2739 {
2740 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2741 fatal = flags;
2742 result = 2; // general error
2743 error = 6; // generic vendor-specific error
2744 msg = "secret not specified";
2745 continue;
2746 }
2747 if (!session[s].random_vector_length)
2748 {
2749 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2750 fatal = flags;
2751 result = 2; // general error
2752 error = 6; // generic
2753 msg = "no random vector";
2754 continue;
2755 }
2756 if (n < 8)
2757 {
2758 LOG(2, s, t, "Short hidden AVP.\n");
2759 fatal = flags;
2760 result = 2; // general error
2761 error = 2; // length is wrong
2762 msg = 0;
2763 continue;
2764 }
2765
2766 // Unhide the AVP
2767 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2768
2769 orig_len = ntohs(*(uint16_t *) b);
2770 if (orig_len > n + 2)
2771 {
2772 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2773 orig_len, n);
2774
2775 fatal = flags;
2776 result = 2; // general error
2777 error = 2; // length is wrong
2778 msg = 0;
2779 continue;
2780 }
2781
2782 b += 2;
2783 n = orig_len;
2784 }
2785
2786 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2787 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2788
2789 switch (mtype)
2790 {
2791 case 0: // message type
2792 message = ntohs(*(uint16_t *) b);
2793 mandatory = flags & 0x80;
2794 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2795 break;
2796 case 1: // result code
2797 {
2798 uint16_t rescode = ntohs(*(uint16_t *) b);
2799 char const *resdesc = "(unknown)";
2800 char const *errdesc = NULL;
2801 int cause = 0;
2802
2803 if (message == 4)
2804 { /* StopCCN */
2805 resdesc = l2tp_stopccn_result_code(rescode);
2806 cause = TERM_LOST_SERVICE;
2807 }
2808 else if (message == 14)
2809 { /* CDN */
2810 resdesc = l2tp_cdn_result_code(rescode);
2811 if (rescode == 1)
2812 cause = TERM_LOST_CARRIER;
2813 else
2814 cause = TERM_ADMIN_RESET;
2815 }
2816
2817 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2818 if (n >= 4)
2819 {
2820 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2821 errdesc = l2tp_error_code(errcode);
2822 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2823 }
2824 if (n > 4)
2825 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2826
2827 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2828 {
2829 disc_cause_set = mtype;
2830 disc_reason = errdesc ? errdesc : resdesc;
2831 disc_cause = cause;
2832 }
2833
2834 break;
2835 }
2836 break;
2837 case 2: // protocol version
2838 {
2839 version = ntohs(*(uint16_t *) (b));
2840 LOG(4, s, t, " Protocol version = %u\n", version);
2841 if (version && version != 0x0100)
2842 { // allow 0.0 and 1.0
2843 LOG(1, s, t, " Bad protocol version %04X\n", version);
2844 fatal = flags;
2845 result = 5; // unspported protocol version
2846 error = 0x0100; // supported version
2847 msg = 0;
2848 continue; // next
2849 }
2850 }
2851 break;
2852 case 3: // framing capabilities
2853 break;
2854 case 4: // bearer capabilities
2855 break;
2856 case 5: // tie breaker
2857 // We never open tunnels, so we don't care about tie breakers
2858 continue;
2859 case 6: // firmware revision
2860 break;
2861 case 7: // host name
2862 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2863 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2864 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2865 // TBA - to send to RADIUS
2866 break;
2867 case 8: // vendor name
2868 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2869 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2870 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2871 break;
2872 case 9: // assigned tunnel
2873 tunnel[t].far = ntohs(*(uint16_t *) (b));
2874 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2875 break;
2876 case 10: // rx window
2877 tunnel[t].window = ntohs(*(uint16_t *) (b));
2878 if (!tunnel[t].window)
2879 tunnel[t].window = 1; // window of 0 is silly
2880 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2881 break;
2882 case 11: // Request Challenge
2883 {
2884 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2885 if (message == 1)
2886 build_chap_response(b, 2, n, &sendchalresponse);
2887 else if (message == 2)
2888 build_chap_response(b, 3, n, &sendchalresponse);
2889 }
2890 break;
2891 case 13: // receive challenge Response
2892 if (tunnel[t].isremotelns)
2893 {
2894 recvchalresponse = calloc(17, 1);
2895 memcpy(recvchalresponse, b, (n < 17) ? n : 16);
2896 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2897 }
2898 else
2899 // Why did they send a response? We never challenge.
2900 LOG(2, s, t, " received unexpected challenge response\n");
2901 break;
2902
2903 case 14: // assigned session
2904 asession = session[s].far = ntohs(*(uint16_t *) (b));
2905 LOG(4, s, t, " assigned session = %u\n", asession);
2906 break;
2907 case 15: // call serial number
2908 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2909 break;
2910 case 18: // bearer type
2911 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2912 // TBA - for RADIUS
2913 break;
2914 case 19: // framing type
2915 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2916 // TBA
2917 break;
2918 case 21: // called number
2919 memset(called, 0, sizeof(called));
2920 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2921 LOG(4, s, t, " Called <%s>\n", called);
2922 break;
2923 case 22: // calling number
2924 memset(calling, 0, sizeof(calling));
2925 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2926 LOG(4, s, t, " Calling <%s>\n", calling);
2927 break;
2928 case 23: // subtype
2929 break;
2930 case 24: // tx connect speed
2931 if (n == 4)
2932 {
2933 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2934 }
2935 else
2936 {
2937 // AS5300s send connect speed as a string
2938 char tmp[30];
2939 memset(tmp, 0, sizeof(tmp));
2940 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2941 session[s].tx_connect_speed = atol(tmp);
2942 }
2943 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2944 break;
2945 case 38: // rx connect speed
2946 if (n == 4)
2947 {
2948 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2949 }
2950 else
2951 {
2952 // AS5300s send connect speed as a string
2953 char tmp[30];
2954 memset(tmp, 0, sizeof(tmp));
2955 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2956 session[s].rx_connect_speed = atol(tmp);
2957 }
2958 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2959 break;
2960 case 25: // Physical Channel ID
2961 {
2962 uint32_t tmp = ntohl(*(uint32_t *) b);
2963 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2964 break;
2965 }
2966 case 29: // Proxy Authentication Type
2967 {
2968 uint16_t atype = ntohs(*(uint16_t *)b);
2969 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2970 break;
2971 }
2972 case 30: // Proxy Authentication Name
2973 {
2974 char authname[64];
2975 memset(authname, 0, sizeof(authname));
2976 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2977 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2978 authname);
2979 break;
2980 }
2981 case 31: // Proxy Authentication Challenge
2982 {
2983 LOG(4, s, t, " Proxy Auth Challenge\n");
2984 break;
2985 }
2986 case 32: // Proxy Authentication ID
2987 {
2988 uint16_t authid = ntohs(*(uint16_t *)(b));
2989 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2990 break;
2991 }
2992 case 33: // Proxy Authentication Response
2993 LOG(4, s, t, " Proxy Auth Response\n");
2994 break;
2995 case 27: // last sent lcp
2996 { // find magic number
2997 uint8_t *p = b, *e = p + n;
2998 while (p + 1 < e && p[1] && p + p[1] <= e)
2999 {
3000 if (*p == 5 && p[1] == 6) // Magic-Number
3001 amagic = ntohl(*(uint32_t *) (p + 2));
3002 else if (*p == 7) // Protocol-Field-Compression
3003 aflags |= SESSION_PFC;
3004 else if (*p == 8) // Address-and-Control-Field-Compression
3005 aflags |= SESSION_ACFC;
3006 p += p[1];
3007 }
3008 }
3009 break;
3010 case 28: // last recv lcp confreq
3011 break;
3012 case 26: // Initial Received LCP CONFREQ
3013 break;
3014 case 39: // seq required - we control it as an LNS anyway...
3015 break;
3016 case 36: // Random Vector
3017 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
3018 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
3019 if (n > sizeof(session[s].random_vector))
3020 n = sizeof(session[s].random_vector);
3021 memcpy(session[s].random_vector, b, n);
3022 session[s].random_vector_length = n;
3023 break;
3024 case 46: // ppp disconnect cause
3025 if (n >= 5)
3026 {
3027 uint16_t code = ntohs(*(uint16_t *) b);
3028 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
3029 uint8_t dir = *(b + 4);
3030
3031 LOG(4, s, t, " PPP disconnect cause "
3032 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3033 code, proto, dir, n - 5, b + 5);
3034
3035 disc_cause_set = mtype;
3036
3037 switch (code)
3038 {
3039 case 1: // admin disconnect
3040 disc_cause = TERM_ADMIN_RESET;
3041 disc_reason = "Administrative disconnect";
3042 break;
3043 case 3: // lcp terminate
3044 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
3045 disc_cause = TERM_USER_REQUEST;
3046 disc_reason = "Normal disconnection";
3047 break;
3048 case 4: // compulsory encryption unavailable
3049 if (dir != 1) break; // 1=refused by peer, 2=local
3050 disc_cause = TERM_USER_ERROR;
3051 disc_reason = "Compulsory encryption refused";
3052 break;
3053 case 5: // lcp: fsm timeout
3054 disc_cause = TERM_PORT_ERROR;
3055 disc_reason = "LCP: FSM timeout";
3056 break;
3057 case 6: // lcp: no recognisable lcp packets received
3058 disc_cause = TERM_PORT_ERROR;
3059 disc_reason = "LCP: no recognisable LCP packets";
3060 break;
3061 case 7: // lcp: magic-no error (possibly looped back)
3062 disc_cause = TERM_PORT_ERROR;
3063 disc_reason = "LCP: magic-no error (possible loop)";
3064 break;
3065 case 8: // lcp: echo request timeout
3066 disc_cause = TERM_PORT_ERROR;
3067 disc_reason = "LCP: echo request timeout";
3068 break;
3069 case 13: // auth: fsm timeout
3070 disc_cause = TERM_SERVICE_UNAVAILABLE;
3071 disc_reason = "Authentication: FSM timeout";
3072 break;
3073 case 15: // auth: unacceptable auth protocol
3074 disc_cause = TERM_SERVICE_UNAVAILABLE;
3075 disc_reason = "Unacceptable authentication protocol";
3076 break;
3077 case 16: // auth: authentication failed
3078 disc_cause = TERM_SERVICE_UNAVAILABLE;
3079 disc_reason = "Authentication failed";
3080 break;
3081 case 17: // ncp: fsm timeout
3082 disc_cause = TERM_SERVICE_UNAVAILABLE;
3083 disc_reason = "NCP: FSM timeout";
3084 break;
3085 case 18: // ncp: no ncps available
3086 disc_cause = TERM_SERVICE_UNAVAILABLE;
3087 disc_reason = "NCP: no NCPs available";
3088 break;
3089 case 19: // ncp: failure to converge on acceptable address
3090 disc_cause = TERM_SERVICE_UNAVAILABLE;
3091 disc_reason = (dir == 1)
3092 ? "NCP: too many Configure-Naks received from peer"
3093 : "NCP: too many Configure-Naks sent to peer";
3094 break;
3095 case 20: // ncp: user not permitted to use any address
3096 disc_cause = TERM_SERVICE_UNAVAILABLE;
3097 disc_reason = (dir == 1)
3098 ? "NCP: local link address not acceptable to peer"
3099 : "NCP: remote link address not acceptable";
3100 break;
3101 }
3102 }
3103 break;
3104 default:
3105 {
3106 static char e[] = "unknown AVP 0xXXXX";
3107 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3108 fatal = flags;
3109 result = 2; // general error
3110 error = 8; // unknown mandatory AVP
3111 sprintf((msg = e) + 14, "%04x", mtype);
3112 continue; // next
3113 }
3114 }
3115 }
3116 // process message
3117 if (fatal & 0x80)
3118 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3119 else
3120 switch (message)
3121 {
3122 case 1: // SCCRQ - Start Control Connection Request
3123 tunnel[t].state = TUNNELOPENING;
3124 LOG(3, s, t, "Received SCCRQ\n");
3125 if (main_quit != QUIT_SHUTDOWN)
3126 {
3127 LOG(3, s, t, "sending SCCRP\n");
3128 controlt *c = controlnew(2); // sending SCCRP
3129 control16(c, 2, version, 1); // protocol version
3130 control32(c, 3, 3, 1); // framing
3131 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3132 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Send Challenge response
3133 control16(c, 9, t, 1); // assigned tunnel
3134 controladd(c, 0, t); // send the resply
3135 }
3136 else
3137 {
3138 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3139 }
3140 break;
3141 case 2: // SCCRP
3142 tunnel[t].state = TUNNELOPEN;
3143 tunnel[t].lastrec = time_now;
3144 LOG(3, s, t, "Received SCCRP\n");
3145 if (main_quit != QUIT_SHUTDOWN)
3146 {
3147 if (tunnel[t].isremotelns && recvchalresponse)
3148 {
3149 hasht hash;
3150
3151 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3152 // check authenticator
3153 if (memcmp(hash, recvchalresponse, 16) == 0)
3154 {
3155 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3156 controlt *c = controlnew(3); // sending SCCCN
3157 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
3158 controls(c, 8, Vendor_name, 1); // Vendor name
3159 control16(c, 2, version, 1); // protocol version
3160 control32(c, 3, 3, 1); // framing Capabilities
3161 if (sendchalresponse) controlb(c, 13, sendchalresponse, 16, 1); // Challenge response
3162 control16(c, 9, t, 1); // assigned tunnel
3163 controladd(c, 0, t); // send
3164 }
3165 else
3166 {
3167 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3168 }
3169 }
3170 }
3171 else
3172 {
3173 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3174 }
3175 break;
3176 case 3: // SCCN
3177 LOG(3, s, t, "Received SCCN\n");
3178 tunnel[t].state = TUNNELOPEN;
3179 tunnel[t].lastrec = time_now;
3180 controlnull(t); // ack
3181 break;
3182 case 4: // StopCCN
3183 LOG(3, s, t, "Received StopCCN\n");
3184 controlnull(t); // ack
3185 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3186 break;
3187 case 6: // HELLO
3188 LOG(3, s, t, "Received HELLO\n");
3189 controlnull(t); // simply ACK
3190 break;
3191 case 7: // OCRQ
3192 // TBA
3193 LOG(3, s, t, "Received OCRQ\n");
3194 break;
3195 case 8: // OCRO
3196 // TBA
3197 LOG(3, s, t, "Received OCRO\n");
3198 break;
3199 case 9: // OCCN
3200 // TBA
3201 LOG(3, s, t, "Received OCCN\n");
3202 break;
3203 case 10: // ICRQ
3204 LOG(3, s, t, "Received ICRQ\n");
3205 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3206 {
3207 controlt *c = controlnew(11); // ICRP
3208
3209 LOG(3, s, t, "Sending ICRP\n");
3210
3211 s = sessionfree;
3212 sessionfree = session[s].next;
3213 memset(&session[s], 0, sizeof(session[s]));
3214
3215 if (s > config->cluster_highest_sessionid)
3216 config->cluster_highest_sessionid = s;
3217
3218 session[s].opened = time_now;
3219 session[s].tunnel = t;
3220 session[s].far = asession;
3221 session[s].last_packet = session[s].last_data = time_now;
3222 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3223 control16(c, 14, s, 1); // assigned session
3224 controladd(c, asession, t); // send the reply
3225
3226 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3227 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3228
3229 session[s].ppp.phase = Establish;
3230 session[s].ppp.lcp = Starting;
3231
3232 STAT(session_created);
3233 break;
3234 }
3235
3236 {
3237 controlt *c = controlnew(14); // CDN
3238 LOG(3, s, t, "Sending CDN\n");
3239 if (!sessionfree)
3240 {
3241 STAT(session_overflow);
3242 LOG(1, 0, t, "No free sessions\n");
3243 control16(c, 1, 4, 0); // temporary lack of resources
3244 }
3245 else
3246 control16(c, 1, 2, 7); // shutting down, try another
3247
3248 controladd(c, asession, t); // send the message
3249 }
3250 return;
3251 case 11: // ICRP
3252 LOG(3, s, t, "Received ICRP\n");
3253 if (session[s].forwardtosession)
3254 {
3255 controlt *c = controlnew(12); // ICCN
3256
3257 session[s].opened = time_now;
3258 session[s].tunnel = t;
3259 session[s].far = asession;
3260 session[s].last_packet = session[s].last_data = time_now;
3261
3262 control32(c, 19, 1, 1); // Framing Type
3263 control32(c, 24, 10000000, 1); // Tx Connect Speed
3264 controladd(c, asession, t); // send the message
3265 LOG(3, s, t, "Sending ICCN\n");
3266 }
3267 break;
3268 case 12: // ICCN
3269 LOG(3, s, t, "Received ICCN\n");
3270 if (amagic == 0) amagic = time_now;
3271 session[s].magic = amagic; // set magic number
3272 session[s].flags = aflags; // set flags received
3273 session[s].mru = PPPoE_MRU; // default
3274 controlnull(t); // ack
3275
3276 // start LCP
3277 sess_local[s].lcp_authtype = config->radius_authprefer;
3278 sess_local[s].ppp_mru = MRU;
3279
3280 // Set multilink options before sending initial LCP packet
3281 sess_local[s].mp_mrru = 1614;
3282 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3283
3284 sendlcp(s, t);
3285 change_state(s, lcp, RequestSent);
3286 break;
3287
3288 case 14: // CDN
3289 LOG(3, s, t, "Received CDN\n");
3290 controlnull(t); // ack
3291 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3292 break;
3293 case 0xFFFF:
3294 LOG(1, s, t, "Missing message type\n");
3295 break;
3296 default:
3297 STAT(tunnel_rx_errors);
3298 if (mandatory)
3299 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3300 else
3301 LOG(1, s, t, "Unknown message type %u\n", message);
3302 break;
3303 }
3304 if (sendchalresponse) free(sendchalresponse);
3305 if (recvchalresponse) free(recvchalresponse);
3306 cluster_send_tunnel(t);
3307 }
3308 else
3309 {
3310 LOG(4, s, t, " Got a ZLB ack\n");
3311 }
3312 }
3313 else
3314 { // data
3315 uint16_t proto;
3316
3317 LOG_HEX(5, "Receive Tunnel Data", p, l);
3318 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3319 { // HDLC address header, discard
3320 p += 2;
3321 l -= 2;
3322 }
3323 if (l < 2)
3324 {
3325 LOG(1, s, t, "Short ppp length %d\n", l);
3326 STAT(tunnel_rx_errors);
3327 return;
3328 }
3329 if (*p & 1)
3330 {
3331 proto = *p++;
3332 l--;
3333 }
3334 else
3335 {
3336 proto = ntohs(*(uint16_t *) p);
3337 p += 2;
3338 l -= 2;
3339 }
3340
3341 if (session[s].forwardtosession)
3342 {
3343 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3344 // Forward to LAC/BAS or Remote LNS session
3345 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3346 return;
3347 }
3348 else if (config->auth_tunnel_change_addr_src)
3349 {
3350 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3351 tunnel[t].port == ntohs(addr->sin_port))
3352 {
3353 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3354 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3355 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3356
3357 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3358 }
3359 }
3360
3361 if (s && !session[s].opened) // Is something wrong??
3362 {
3363 if (!config->cluster_iam_master)
3364 {
3365 // Pass it off to the master to deal with..
3366 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3367 return;
3368 }
3369
3370 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3371 STAT(tunnel_rx_errors);
3372 return;
3373 }
3374
3375 if (proto == PPPPAP)
3376 {
3377 session[s].last_packet = time_now;
3378 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3379 processpap(s, t, p, l);
3380 }
3381 else if (proto == PPPCHAP)
3382 {
3383 session[s].last_packet = time_now;
3384 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3385 processchap(s, t, p, l);
3386 }
3387 else if (proto == PPPLCP)
3388 {
3389 session[s].last_packet = time_now;
3390 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3391 processlcp(s, t, p, l);
3392 }
3393 else if (proto == PPPIPCP)
3394 {
3395 session[s].last_packet = time_now;
3396 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3397 processipcp(s, t, p, l);
3398 }
3399 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3400 {
3401 session[s].last_packet = time_now;
3402 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3403 processipv6cp(s, t, p, l);
3404 }
3405 else if (proto == PPPCCP)
3406 {
3407 session[s].last_packet = time_now;
3408 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3409 processccp(s, t, p, l);
3410 }
3411 else if (proto == PPPIP)
3412 {
3413 if (session[s].die)
3414 {
3415 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3416 return; // closing session, PPP not processed
3417 }
3418
3419 session[s].last_packet = session[s].last_data = time_now;
3420 if (session[s].walled_garden && !config->cluster_iam_master)
3421 {
3422 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3423 return;
3424 }
3425
3426 processipin(s, t, p, l);
3427 }
3428 else if (proto == PPPMP)
3429 {
3430 if (session[s].die)
3431 {
3432 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3433 return; // closing session, PPP not processed
3434 }
3435
3436 session[s].last_packet = session[s].last_data = time_now;
3437 if (!config->cluster_iam_master)
3438 {
3439 // The fragments reconstruction is managed by the Master.
3440 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3441 return;
3442 }
3443
3444 processmpin(s, t, p, l);
3445 }
3446 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3447 {
3448 if (session[s].die)
3449 {
3450 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3451 return; // closing session, PPP not processed
3452 }
3453
3454 session[s].last_packet = session[s].last_data = time_now;
3455 if (session[s].walled_garden && !config->cluster_iam_master)
3456 {
3457 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3458 return;
3459 }
3460
3461 if (!config->cluster_iam_master)
3462 {
3463 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
3464 if (*(p + 6) == 17 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
3465 *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
3466 *(uint16_t *)(p + 34) == 0 && *(p + 36) == 0 && *(p + 37) == 1 && *(p + 38) == 0 && *(p + 39) == 2 &&
3467 *(p + 40) == 2 && *(p + 41) == 0x22 && *(p + 42) == 2 && *(p + 43) == 0x23)
3468 {
3469 // DHCPV6 must be managed by the Master.
3470 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd);
3471 return;
3472 }
3473 }
3474
3475 processipv6in(s, t, p, l);
3476 }
3477 else if (session[s].ppp.lcp == Opened)
3478 {
3479 session[s].last_packet = time_now;
3480 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port, indexudpfd); return; }
3481 protoreject(s, t, p, l, proto);
3482 }
3483 else
3484 {
3485 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3486 proto, ppp_state(session[s].ppp.lcp));
3487 }
3488 }
3489 }
3490
3491 // read and process packet on tun
3492 // (i.e. this routine writes to buf[-8]).
3493 static void processtun(uint8_t * buf, int len)
3494 {
3495 LOG_HEX(5, "Receive TUN Data", buf, len);
3496 STAT(tun_rx_packets);
3497 INC_STAT(tun_rx_bytes, len);
3498
3499 CSTAT(processtun);
3500
3501 eth_rx_pkt++;
3502 eth_rx += len;
3503 if (len < 22)
3504 {
3505 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3506 STAT(tun_rx_errors);
3507 return;
3508 }
3509
3510 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3511 processipout(buf, len);
3512 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3513 && config->ipv6_prefix.s6_addr[0])
3514 processipv6out(buf, len);
3515
3516 // Else discard.
3517 }
3518
3519 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3520 // that we look at the whole of the tunnel, radius and session tables
3521 // every second
3522 static void regular_cleanups(double period)
3523 {
3524 // Next tunnel, radius and session to check for actions on.
3525 static tunnelidt t = 0;
3526 static int r = 0;
3527 static sessionidt s = 0;
3528
3529 int t_actions = 0;
3530 int r_actions = 0;
3531 int s_actions = 0;
3532
3533 int t_slice;
3534 int r_slice;
3535 int s_slice;
3536
3537 int i;
3538 int a;
3539
3540 // divide up tables into slices based on the last run
3541 t_slice = config->cluster_highest_tunnelid * period;
3542 r_slice = (MAXRADIUS - 1) * period;
3543 s_slice = config->cluster_highest_sessionid * period;
3544
3545 if (t_slice < 1)
3546 t_slice = 1;
3547 else if (t_slice > config->cluster_highest_tunnelid)
3548 t_slice = config->cluster_highest_tunnelid;
3549
3550 if (r_slice < 1)
3551 r_slice = 1;
3552 else if (r_slice > (MAXRADIUS - 1))
3553 r_slice = MAXRADIUS - 1;
3554
3555 if (s_slice < 1)
3556 s_slice = 1;
3557 else if (s_slice > config->cluster_highest_sessionid)
3558 s_slice = config->cluster_highest_sessionid;
3559
3560 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3561
3562 for (i = 0; i < t_slice; i++)
3563 {
3564 t++;
3565 if (t > config->cluster_highest_tunnelid)
3566 t = 1;
3567
3568 if (t == TUNNEL_ID_PPPOE)
3569 continue;
3570
3571 // check for expired tunnels
3572 if (tunnel[t].die && tunnel[t].die <= TIME)
3573 {
3574 STAT(tunnel_timeout);
3575 tunnelkill(t, "Expired");
3576 t_actions++;
3577 continue;
3578 }
3579 // check for message resend
3580 if (tunnel[t].retry && tunnel[t].controlc)
3581 {
3582 // resend pending messages as timeout on reply
3583 if (tunnel[t].retry <= TIME)
3584 {
3585 controlt *c = tunnel[t].controls;
3586 uint16_t w = tunnel[t].window;
3587 tunnel[t].try++; // another try
3588 if (tunnel[t].try > 5)
3589 tunnelkill(t, "Timeout on control message"); // game over
3590 else
3591 while (c && w--)
3592 {
3593 tunnelsend(c->buf, c->length, t);
3594 c = c->next;
3595 }
3596
3597 t_actions++;
3598 }
3599 }
3600 // Send hello
3601 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3602 {
3603 if (!config->disable_sending_hello)
3604 {
3605 controlt *c = controlnew(6); // sending HELLO
3606 controladd(c, 0, t); // send the message
3607 LOG(3, 0, t, "Sending HELLO message\n");
3608 t_actions++;
3609 }
3610 }
3611
3612 // Check for tunnel changes requested from the CLI
3613 if ((a = cli_tunnel_actions[t].action))
3614 {
3615 cli_tunnel_actions[t].action = 0;
3616 if (a & CLI_TUN_KILL)
3617 {
3618 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3619 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3620 t_actions++;
3621 }
3622 }
3623 }
3624
3625 for (i = 0; i < r_slice; i++)
3626 {
3627 r++;
3628 if (r >= MAXRADIUS)
3629 r = 1;
3630
3631 if (!radius[r].state)
3632 continue;
3633
3634 if (radius[r].retry <= TIME)
3635 {
3636 radiusretry(r);
3637 r_actions++;
3638 }
3639 }
3640
3641 for (i = 0; i < s_slice; i++)
3642 {
3643 s++;
3644 if (s > config->cluster_highest_sessionid)
3645 s = 1;
3646
3647 if (!session[s].opened) // Session isn't in use
3648 continue;
3649
3650 // check for expired sessions
3651 if (session[s].die)
3652 {
3653 if (session[s].die <= TIME)
3654 {
3655 sessionkill(s, "Expired");
3656 s_actions++;
3657 }
3658 continue;
3659 }
3660
3661 // PPP timeouts
3662 if (sess_local[s].lcp.restart <= time_now)
3663 {
3664 int next_state = session[s].ppp.lcp;
3665 switch (session[s].ppp.lcp)
3666 {
3667 case RequestSent:
3668 case AckReceived:
3669 next_state = RequestSent;
3670
3671 case AckSent:
3672 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3673 {
3674 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3675 sendlcp(s, session[s].tunnel);
3676 change_state(s, lcp, next_state);
3677 }
3678 else
3679 {
3680 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3681 STAT(session_timeout);
3682 }
3683
3684 s_actions++;
3685 }
3686
3687 if (session[s].die)
3688 continue;
3689 }
3690
3691 if (sess_local[s].ipcp.restart <= time_now)
3692 {
3693 int next_state = session[s].ppp.ipcp;
3694 switch (session[s].ppp.ipcp)
3695 {
3696 case RequestSent:
3697 case AckReceived:
3698 next_state = RequestSent;
3699
3700 case AckSent:
3701 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3702 {
3703 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3704 sendipcp(s, session[s].tunnel);
3705 change_state(s, ipcp, next_state);
3706 }
3707 else
3708 {
3709 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3710 STAT(session_timeout);
3711 }
3712
3713 s_actions++;
3714 }
3715
3716 if (session[s].die)
3717 continue;
3718 }
3719
3720 if (sess_local[s].ipv6cp.restart <= time_now)
3721 {
3722 int next_state = session[s].ppp.ipv6cp;
3723 switch (session[s].ppp.ipv6cp)
3724 {
3725 case RequestSent:
3726 case AckReceived:
3727 next_state = RequestSent;
3728
3729 case AckSent:
3730 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3731 {
3732 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3733 sendipv6cp(s, session[s].tunnel);
3734 change_state(s, ipv6cp, next_state);
3735 }
3736 else
3737 {
3738 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3739 change_state(s, ipv6cp, Stopped);
3740 }
3741
3742 s_actions++;
3743 }
3744 }
3745
3746 if (sess_local[s].ccp.restart <= time_now)
3747 {
3748 int next_state = session[s].ppp.ccp;
3749 switch (session[s].ppp.ccp)
3750 {
3751 case RequestSent:
3752 case AckReceived:
3753 next_state = RequestSent;
3754
3755 case AckSent:
3756 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3757 {
3758 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3759 sendccp(s, session[s].tunnel);
3760 change_state(s, ccp, next_state);
3761 }
3762 else
3763 {
3764 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3765 change_state(s, ccp, Stopped);
3766 }
3767
3768 s_actions++;
3769 }
3770 }
3771
3772 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3773 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3774 {
3775 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3776 STAT(session_timeout);
3777 s_actions++;
3778 continue;
3779 }
3780
3781 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3782 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3783 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3784 {
3785 uint8_t b[MAXETHER];
3786
3787 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3788 if (!q) continue;
3789
3790 *q = EchoReq;
3791 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3792 *(uint16_t *)(q + 2) = htons(8); // Length
3793 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3794
3795 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3796 (int)(time_now - session[s].last_packet));
3797
3798 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3799 sess_local[s].last_echo = time_now;
3800 s_actions++;
3801 }
3802
3803 // Drop sessions who have reached session_timeout seconds
3804 if (session[s].session_timeout)
3805 {
3806 bundleidt bid = session[s].bundle;
3807 if (bid)
3808 {
3809 if (time_now - bundle[bid].last_check >= 1)
3810 {
3811 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3812 bundle[bid].last_check = time_now;
3813 if (bundle[bid].online_time >= session[s].session_timeout)
3814 {
3815 int ses;
3816 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3817 {
3818 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3819 s_actions++;
3820 continue;
3821 }
3822 }
3823 }
3824 }
3825 else if (time_now - session[s].opened >= session[s].session_timeout)
3826 {
3827 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3828 s_actions++;
3829 continue;
3830 }
3831 }
3832
3833 // Drop sessions who have reached idle_timeout seconds
3834 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3835 {
3836 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3837 STAT(session_timeout);
3838 s_actions++;
3839 continue;
3840 }
3841
3842 // Check for actions requested from the CLI
3843 if ((a = cli_session_actions[s].action))
3844 {
3845 int send = 0;
3846
3847 cli_session_actions[s].action = 0;
3848 if (a & CLI_SESS_KILL)
3849 {
3850 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3851 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3852 a = 0; // dead, no need to check for other actions
3853 s_actions++;
3854 }
3855
3856 if (a & CLI_SESS_NOSNOOP)
3857 {
3858 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3859 session[s].snoop_ip = 0;
3860 session[s].snoop_port = 0;
3861 s_actions++;
3862 send++;
3863 }
3864 else if (a & CLI_SESS_SNOOP)
3865 {
3866 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3867 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3868 cli_session_actions[s].snoop_port);
3869
3870 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3871 session[s].snoop_port = cli_session_actions[s].snoop_port;
3872 s_actions++;
3873 send++;
3874 }
3875
3876 if (a & CLI_SESS_NOTHROTTLE)
3877 {
3878 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3879 throttle_session(s, 0, 0);
3880 s_actions++;
3881 send++;
3882 }
3883 else if (a & CLI_SESS_THROTTLE)
3884 {
3885 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3886 cli_session_actions[s].throttle_in,
3887 cli_session_actions[s].throttle_out);
3888
3889 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3890 s_actions++;
3891 send++;
3892 }
3893
3894 if (a & CLI_SESS_NOFILTER)
3895 {
3896 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3897 filter_session(s, 0, 0);
3898 s_actions++;
3899 send++;
3900 }
3901 else if (a & CLI_SESS_FILTER)
3902 {
3903 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3904 cli_session_actions[s].filter_in,
3905 cli_session_actions[s].filter_out);
3906
3907 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3908 s_actions++;
3909 send++;
3910 }
3911
3912 if (send)
3913 cluster_send_session(s);
3914 }
3915
3916 // RADIUS interim accounting
3917 if (config->radius_accounting && config->radius_interim > 0
3918 && session[s].ip && !session[s].walled_garden
3919 && !sess_local[s].radius // RADIUS already in progress
3920 && time_now - sess_local[s].last_interim >= config->radius_interim
3921 && session[s].flags & SESSION_STARTED)
3922 {
3923 int rad = radiusnew(s);
3924 if (!rad)
3925 {
3926 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3927 STAT(radius_overflow);
3928 continue;
3929 }
3930
3931 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3932 session[s].user, session[s].unique_id);
3933
3934 radiussend(rad, RADIUSINTERIM);
3935 sess_local[s].last_interim = time_now;
3936 s_actions++;
3937 }
3938 }
3939
3940 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3941 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3942 }
3943
3944 //
3945 // Are we in the middle of a tunnel update, or radius
3946 // requests??
3947 //
3948 static int still_busy(void)
3949 {
3950 int i;
3951 static clockt last_talked = 0;
3952 static clockt start_busy_wait = 0;
3953
3954 #ifdef BGP
3955 static time_t stopped_bgp = 0;
3956 if (bgp_configured)
3957 {
3958 if (!stopped_bgp)
3959 {
3960 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3961
3962 for (i = 0; i < BGP_NUM_PEERS; i++)
3963 if (bgp_peers[i].state == Established)
3964 bgp_stop(&bgp_peers[i]);
3965
3966 stopped_bgp = time_now;
3967
3968 if (!config->cluster_iam_master)
3969 {
3970 // we don't want to become master
3971 cluster_send_ping(0);
3972
3973 return 1;
3974 }
3975 }
3976
3977 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3978 return 1;
3979 }
3980 #endif /* BGP */
3981
3982 if (!config->cluster_iam_master)
3983 return 0;
3984
3985 if (main_quit == QUIT_SHUTDOWN)
3986 {
3987 static int dropped = 0;
3988 if (!dropped)
3989 {
3990 int i;
3991
3992 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3993 for (i = 1; i < MAXTUNNEL; i++)
3994 if (tunnel[i].ip || tunnel[i].state)
3995 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3996
3997 dropped = 1;
3998 }
3999 }
4000
4001 if (start_busy_wait == 0)
4002 start_busy_wait = TIME;
4003
4004 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
4005 {
4006 if (!tunnel[i].controlc)
4007 continue;
4008
4009 if (last_talked != TIME)
4010 {
4011 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
4012 last_talked = TIME;
4013 }
4014 return 1;
4015 }
4016
4017 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
4018 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
4019 {
4020 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
4021 return 0;
4022 }
4023
4024 for (i = 1; i < MAXRADIUS; i++)
4025 {
4026 if (radius[i].state == RADIUSNULL)
4027 continue;
4028 if (radius[i].state == RADIUSWAIT)
4029 continue;
4030
4031 if (last_talked != TIME)
4032 {
4033 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
4034 last_talked = TIME;
4035 }
4036 return 1;
4037 }
4038
4039 return 0;
4040 }
4041
4042 #ifdef HAVE_EPOLL
4043 # include <sys/epoll.h>
4044 #else
4045 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4046 # include "fake_epoll.h"
4047 #endif
4048
4049 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4050 #define BASE_FDS (9 + MAX_UDPFD)
4051
4052 // additional polled fds
4053 #ifdef BGP
4054 # define EXTRA_FDS BGP_NUM_PEERS
4055 #else
4056 # define EXTRA_FDS 0
4057 #endif
4058
4059 // main loop - gets packets on tun or udp and processes them
4060 static void mainloop(void)
4061 {
4062 int i, j;
4063 uint8_t buf[65536];
4064 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4065 // and the forwarded pppoe session
4066 int size_bufp = sizeof(buf) - 32;
4067 clockt next_cluster_ping = 0; // send initial ping immediately
4068 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
4069 int maxevent = sizeof(events)/sizeof(*events);
4070
4071 if ((epollfd = epoll_create(maxevent)) < 0)
4072 {
4073 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
4074 exit(1);
4075 }
4076
4077 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",
4078 clifd, cluster_sockfd, tunfd, udpfd[0], controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
4079
4080 /* setup our fds to poll for input */
4081 {
4082 static struct event_data d[BASE_FDS];
4083 struct epoll_event e;
4084
4085 e.events = EPOLLIN;
4086 i = 0;
4087
4088 if (clifd >= 0)
4089 {
4090 d[i].type = FD_TYPE_CLI;
4091 e.data.ptr = &d[i++];
4092 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4093 }
4094
4095 d[i].type = FD_TYPE_CLUSTER;
4096 e.data.ptr = &d[i++];
4097 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4098
4099 d[i].type = FD_TYPE_TUN;
4100 e.data.ptr = &d[i++];
4101 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4102
4103 d[i].type = FD_TYPE_CONTROL;
4104 e.data.ptr = &d[i++];
4105 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4106
4107 d[i].type = FD_TYPE_DAE;
4108 e.data.ptr = &d[i++];
4109 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4110
4111 d[i].type = FD_TYPE_NETLINK;
4112 e.data.ptr = &d[i++];
4113 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4114
4115 d[i].type = FD_TYPE_PPPOEDISC;
4116 e.data.ptr = &d[i++];
4117 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4118
4119 d[i].type = FD_TYPE_PPPOESESS;
4120 e.data.ptr = &d[i++];
4121 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4122
4123 for (j = 0; j < config->nbudpfd; j++)
4124 {
4125 d[i].type = FD_TYPE_UDP;
4126 d[i].index = j;
4127 e.data.ptr = &d[i++];
4128 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd[j], &e);
4129 }
4130 }
4131
4132 #ifdef BGP
4133 signal(SIGPIPE, SIG_IGN);
4134 bgp_setup(config->as_number);
4135 if (config->bind_address)
4136 bgp_add_route(config->bind_address, 0xffffffff);
4137
4138 for (i = 0; i < BGP_NUM_PEERS; i++)
4139 {
4140 if (config->neighbour[i].name[0])
4141 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4142 config->neighbour[i].as, config->neighbour[i].keepalive,
4143 config->neighbour[i].hold, config->neighbour[i].update_source,
4144 0); /* 0 = routing disabled */
4145 }
4146 #endif /* BGP */
4147
4148 while (!main_quit || still_busy())
4149 {
4150 int more = 0;
4151 int n;
4152
4153
4154 if (main_reload)
4155 {
4156 main_reload = 0;
4157 read_config_file();
4158 config->reload_config++;
4159 }
4160
4161 if (config->reload_config)
4162 {
4163 config->reload_config = 0;
4164 update_config();
4165 }
4166
4167 #ifdef BGP
4168 bgp_set_poll();
4169 #endif /* BGP */
4170
4171 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4172 STAT(select_called);
4173
4174 TIME = now(NULL);
4175 if (n < 0)
4176 {
4177 if (errno == EINTR ||
4178 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4179 continue;
4180
4181 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4182 break; // exit
4183 }
4184
4185 if (n)
4186 {
4187 struct sockaddr_in addr;
4188 struct in_addr local;
4189 socklen_t alen;
4190 int c, s;
4191 int udp_ready[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4192 int pppoesess_ready = 0;
4193 int pppoesess_pkts = 0;
4194 int tun_ready = 0;
4195 int cluster_ready = 0;
4196 int udp_pkts[MAX_UDPFD + 1] = INIT_TABUDPVAR;
4197 int tun_pkts = 0;
4198 int cluster_pkts = 0;
4199 #ifdef BGP
4200 uint32_t bgp_events[BGP_NUM_PEERS];
4201 memset(bgp_events, 0, sizeof(bgp_events));
4202 #endif /* BGP */
4203
4204 for (c = n, i = 0; i < c; i++)
4205 {
4206 struct event_data *d = events[i].data.ptr;
4207
4208 switch (d->type)
4209 {
4210 case FD_TYPE_CLI: // CLI connections
4211 {
4212 int cli;
4213
4214 alen = sizeof(addr);
4215 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4216 {
4217 cli_do(cli);
4218 close(cli);
4219 }
4220 else
4221 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4222
4223 n--;
4224 break;
4225 }
4226
4227 // these are handled below, with multiple interleaved reads
4228 case FD_TYPE_CLUSTER: cluster_ready++; break;
4229 case FD_TYPE_TUN: tun_ready++; break;
4230 case FD_TYPE_UDP: udp_ready[d->index]++; break;
4231 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4232
4233 case FD_TYPE_PPPOEDISC: // pppoe discovery
4234 s = read(pppoediscfd, p, size_bufp);
4235 if (s > 0) process_pppoe_disc(p, s);
4236 n--;
4237 break;
4238
4239 case FD_TYPE_CONTROL: // nsctl commands
4240 alen = sizeof(addr);
4241 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4242 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4243 n--;
4244 break;
4245
4246 case FD_TYPE_DAE: // DAE requests
4247 alen = sizeof(addr);
4248 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4249 if (s > 0) processdae(p, s, &addr, alen, &local);
4250 n--;
4251 break;
4252
4253 case FD_TYPE_RADIUS: // RADIUS response
4254 alen = sizeof(addr);
4255 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4256 if (s >= 0 && config->cluster_iam_master)
4257 {
4258 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4259 addr.sin_addr.s_addr == config->radiusserver[1])
4260 processrad(p, s, d->index);
4261 else
4262 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4263 fmtaddr(addr.sin_addr.s_addr, 0));
4264 }
4265
4266 n--;
4267 break;
4268
4269 #ifdef BGP
4270 case FD_TYPE_BGP:
4271 bgp_events[d->index] = events[i].events;
4272 n--;
4273 break;
4274 #endif /* BGP */
4275
4276 case FD_TYPE_NETLINK:
4277 {
4278 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4279 s = netlink_recv(p, size_bufp);
4280 if (nh->nlmsg_type == NLMSG_ERROR)
4281 {
4282 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4283 if (errmsg->error)
4284 {
4285 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4286 {
4287 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4288 exit(1);
4289 }
4290 else
4291 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4292 }
4293 // else it's a ack
4294 }
4295 else
4296 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);
4297 n--;
4298 break;
4299 }
4300
4301 default:
4302 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4303 }
4304 }
4305
4306 #ifdef BGP
4307 bgp_process(bgp_events);
4308 #endif /* BGP */
4309
4310 for (c = 0; n && c < config->multi_read_count; c++)
4311 {
4312 for (j = 0; j < config->nbudpfd; j++)
4313 {
4314 // L2TP and L2TP REMOTE LNS
4315 if (udp_ready[j])
4316 {
4317 alen = sizeof(addr);
4318 if ((s = recvfrom(udpfd[j], p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4319 {
4320 processudp(p, s, &addr, j);
4321 udp_pkts[j]++;
4322 }
4323 else
4324 {
4325 udp_ready[j] = 0;
4326 n--;
4327 }
4328 }
4329 }
4330
4331 // incoming IP
4332 if (tun_ready)
4333 {
4334 if ((s = read(tunfd, p, size_bufp)) > 0)
4335 {
4336 processtun(p, s);
4337 tun_pkts++;
4338 }
4339 else
4340 {
4341 tun_ready = 0;
4342 n--;
4343 }
4344 }
4345
4346 // pppoe session
4347 if (pppoesess_ready)
4348 {
4349 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4350 {
4351 process_pppoe_sess(p, s);
4352 pppoesess_pkts++;
4353 }
4354 else
4355 {
4356 pppoesess_ready = 0;
4357 n--;
4358 }
4359 }
4360
4361 // cluster
4362 if (cluster_ready)
4363 {
4364 alen = sizeof(addr);
4365 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4366 {
4367 processcluster(p, s, addr.sin_addr.s_addr);
4368 cluster_pkts++;
4369 }
4370 else
4371 {
4372 cluster_ready = 0;
4373 n--;
4374 }
4375 }
4376 }
4377
4378 if (udp_pkts[0] > 1 || tun_pkts > 1 || cluster_pkts > 1)
4379 STAT(multi_read_used);
4380
4381 if (c >= config->multi_read_count)
4382 {
4383 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4384 config->multi_read_count, udp_pkts[0], tun_pkts, cluster_pkts, pppoesess_pkts);
4385 STAT(multi_read_exceeded);
4386 more++;
4387 }
4388 }
4389 #ifdef BGP
4390 else
4391 /* no event received, but timers could still have expired */
4392 bgp_process_peers_timers();
4393 #endif /* BGP */
4394
4395 if (time_changed)
4396 {
4397 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4398
4399 // Log current traffic stats
4400 snprintf(config->bandwidth, sizeof(config->bandwidth),
4401 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4402 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4403 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4404 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4405
4406 udp_tx = udp_rx = 0;
4407 udp_rx_pkt = eth_rx_pkt = 0;
4408 eth_tx = eth_rx = 0;
4409 time_changed = 0;
4410
4411 if (config->dump_speed)
4412 printf("%s\n", config->bandwidth);
4413
4414 // Update the internal time counter
4415 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4416
4417 {
4418 // Run timer hooks
4419 struct param_timer p = { time_now };
4420 run_plugins(PLUGIN_TIMER, &p);
4421 }
4422 }
4423
4424 // Runs on every machine (master and slaves).
4425 if (next_cluster_ping <= TIME)
4426 {
4427 // Check to see which of the cluster is still alive..
4428
4429 cluster_send_ping(basetime); // Only does anything if we're a slave
4430 cluster_check_master(); // ditto.
4431
4432 cluster_heartbeat(); // Only does anything if we're a master.
4433 cluster_check_slaves(); // ditto.
4434
4435 master_update_counts(); // If we're a slave, send our byte counters to our master.
4436
4437 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4438 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4439 else
4440 next_cluster_ping = TIME + config->cluster_hb_interval;
4441 }
4442
4443 if (!config->cluster_iam_master)
4444 continue;
4445
4446 // Run token bucket filtering queue..
4447 // Only run it every 1/10th of a second.
4448 {
4449 static clockt last_run = 0;
4450 if (last_run != TIME)
4451 {
4452 last_run = TIME;
4453 tbf_run_timer();
4454 }
4455 }
4456
4457 // Handle timeouts, retries etc.
4458 {
4459 static double last_clean = 0;
4460 double this_clean;
4461 double diff;
4462
4463 TIME = now(&this_clean);
4464 diff = this_clean - last_clean;
4465
4466 // Run during idle time (after we've handled
4467 // all incoming packets) or every 1/10th sec
4468 if (!more || diff > 0.1)
4469 {
4470 regular_cleanups(diff);
4471 last_clean = this_clean;
4472 }
4473 }
4474
4475 if (*config->accounting_dir)
4476 {
4477 static clockt next_acct = 0;
4478 static clockt next_shut_acct = 0;
4479
4480 if (next_acct <= TIME)
4481 {
4482 // Dump accounting data
4483 next_acct = TIME + ACCT_TIME;
4484 next_shut_acct = TIME + ACCT_SHUT_TIME;
4485 dump_acct_info(1);
4486 }
4487 else if (next_shut_acct <= TIME)
4488 {
4489 // Dump accounting data for shutdown sessions
4490 next_shut_acct = TIME + ACCT_SHUT_TIME;
4491 if (shut_acct_n)
4492 dump_acct_info(0);
4493 }
4494 }
4495 }
4496
4497 // Are we the master and shutting down??
4498 if (config->cluster_iam_master)
4499 cluster_heartbeat(); // Flush any queued changes..
4500
4501 // Ok. Notify everyone we're shutting down. If we're
4502 // the master, this will force an election.
4503 cluster_send_ping(0);
4504
4505 //
4506 // Important!!! We MUST not process any packets past this point!
4507 LOG(1, 0, 0, "Shutdown complete\n");
4508 }
4509
4510 static void stripdomain(char *host)
4511 {
4512 char *p;
4513
4514 if ((p = strchr(host, '.')))
4515 {
4516 char *domain = 0;
4517 char _domain[1024];
4518
4519 // strip off domain
4520 FILE *resolv = fopen("/etc/resolv.conf", "r");
4521 if (resolv)
4522 {
4523 char buf[1024];
4524 char *b;
4525
4526 while (fgets(buf, sizeof(buf), resolv))
4527 {
4528 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4529 continue;
4530
4531 if (!isspace(buf[6]))
4532 continue;
4533
4534 b = buf + 7;
4535 while (isspace(*b)) b++;
4536
4537 if (*b)
4538 {
4539 char *d = b;
4540 while (*b && !isspace(*b)) b++;
4541 *b = 0;
4542 if (buf[0] == 'd') // domain is canonical
4543 {
4544 domain = d;
4545 break;
4546 }
4547
4548 // first search line
4549 if (!domain)
4550 {
4551 // hold, may be subsequent domain line
4552 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4553 domain = _domain;
4554 }
4555 }
4556 }
4557
4558 fclose(resolv);
4559 }
4560
4561 if (domain)
4562 {
4563 int hl = strlen(host);
4564 int dl = strlen(domain);
4565 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4566 host[hl -dl - 1] = 0;
4567 }
4568 else
4569 {
4570 *p = 0; // everything after first dot
4571 }
4572 }
4573 }
4574
4575 // Init data structures
4576 static void initdata(int optdebug, char *optconfig)
4577 {
4578 int i;
4579
4580 if (!(config = shared_malloc(sizeof(configt))))
4581 {
4582 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4583 exit(1);
4584 }
4585
4586 memset(config, 0, sizeof(configt));
4587 time(&config->start_time);
4588 strncpy(config->config_file, optconfig, strlen(optconfig));
4589 config->debug = optdebug;
4590 config->num_tbfs = MAXTBFS;
4591 config->rl_rate = 28; // 28kbps
4592 config->cluster_mcast_ttl = 1;
4593 config->cluster_master_min_adv = 1;
4594 config->ppp_restart_time = 3;
4595 config->ppp_max_configure = 10;
4596 config->ppp_max_failure = 5;
4597 config->kill_timedout_sessions = 1;
4598 strcpy(config->random_device, RANDOMDEVICE);
4599 // Set default value echo_timeout and idle_echo_timeout
4600 config->echo_timeout = ECHO_TIMEOUT;
4601 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4602
4603 log_stream = stderr;
4604
4605 #ifdef RINGBUFFER
4606 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4607 {
4608 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4609 exit(1);
4610 }
4611 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4612 #endif
4613
4614 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4615 {
4616 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4617 exit(1);
4618 }
4619 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4620 {
4621 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4622 exit(1);
4623 }
4624 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4625 {
4626 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4627 exit(1);
4628 }
4629 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4630 {
4631 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4632 exit(1);
4633 }
4634 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4635 {
4636 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4637 exit(1);
4638 }
4639
4640 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4641 {
4642 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4643 exit(1);
4644 }
4645
4646 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4647 {
4648 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4649 exit(1);
4650 }
4651
4652 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4653 {
4654 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4655 exit(1);
4656 }
4657
4658 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4659 {
4660 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4661 exit(1);
4662 }
4663 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4664
4665 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4666 {
4667 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4668 exit(1);
4669 }
4670 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4671
4672 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4673 {
4674 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4675 exit(1);
4676 }
4677 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4678
4679 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4680 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4681 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4682 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4683 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4684
4685 // Put all the sessions on the free list marked as undefined.
4686 for (i = 1; i < MAXSESSION; i++)
4687 {
4688 session[i].next = i + 1;
4689 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4690 }
4691 session[MAXSESSION - 1].next = 0;
4692 sessionfree = 1;
4693
4694 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4695 for (i = 1; i < MAXTUNNEL; i++)
4696 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4697
4698 for (i = 1; i < MAXBUNDLE; i++) {
4699 bundle[i].state = BUNDLEUNDEF;
4700 }
4701
4702 if (!*hostname)
4703 {
4704 // Grab my hostname unless it's been specified
4705 gethostname(hostname, sizeof(hostname));
4706 stripdomain(hostname);
4707 }
4708
4709 _statistics->start_time = _statistics->last_reset = time(NULL);
4710
4711 #ifdef BGP
4712 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4713 {
4714 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4715 exit(1);
4716 }
4717 #endif /* BGP */
4718
4719 lac_initremotelnsdata();
4720 }
4721
4722 static int assign_ip_address(sessionidt s)
4723 {
4724 uint32_t i;
4725 int best = -1;
4726 time_t best_time = time_now;
4727 char *u = session[s].user;
4728 char reuse = 0;
4729
4730
4731 CSTAT(assign_ip_address);
4732
4733 for (i = 1; i < ip_pool_size; i++)
4734 {
4735 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4736 continue;
4737
4738 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4739 {
4740 best = i;
4741 reuse = 1;
4742 break;
4743 }
4744
4745 if (ip_address_pool[i].last < best_time)
4746 {
4747 best = i;
4748 if (!(best_time = ip_address_pool[i].last))
4749 break; // never used, grab this one
4750 }
4751 }
4752
4753 if (best < 0)
4754 {
4755 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4756 return 0;
4757 }
4758
4759 session[s].ip = ip_address_pool[best].address;
4760 session[s].ip_pool_index = best;
4761 ip_address_pool[best].assigned = 1;
4762 ip_address_pool[best].last = time_now;
4763 ip_address_pool[best].session = s;
4764 if (session[s].walled_garden)
4765 /* Don't track addresses of users in walled garden (note: this
4766 means that their address isn't "sticky" even if they get
4767 un-gardened). */
4768 ip_address_pool[best].user[0] = 0;
4769 else
4770 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4771
4772 STAT(ip_allocated);
4773 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4774 reuse ? "Reusing" : "Allocating", best);
4775
4776 return 1;
4777 }
4778
4779 static void free_ip_address(sessionidt s)
4780 {
4781 int i = session[s].ip_pool_index;
4782
4783
4784 CSTAT(free_ip_address);
4785
4786 if (!session[s].ip)
4787 return; // what the?
4788
4789 if (i < 0) // Is this actually part of the ip pool?
4790 i = 0;
4791
4792 STAT(ip_freed);
4793 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4794 session[s].ip = 0;
4795 ip_address_pool[i].assigned = 0;
4796 ip_address_pool[i].session = 0;
4797 ip_address_pool[i].last = time_now;
4798 }
4799
4800 //
4801 // Fsck the address pool against the session table.
4802 // Normally only called when we become a master.
4803 //
4804 // This isn't perfect: We aren't keep tracking of which
4805 // users used to have an IP address.
4806 //
4807 void rebuild_address_pool(void)
4808 {
4809 int i;
4810
4811 //
4812 // Zero the IP pool allocation, and build
4813 // a map from IP address to pool index.
4814 for (i = 1; i < MAXIPPOOL; ++i)
4815 {
4816 ip_address_pool[i].assigned = 0;
4817 ip_address_pool[i].session = 0;
4818 if (!ip_address_pool[i].address)
4819 continue;
4820
4821 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4822 }
4823
4824 for (i = 0; i < MAXSESSION; ++i)
4825 {
4826 int ipid;
4827 if (!(session[i].opened && session[i].ip))
4828 continue;
4829
4830 ipid = - lookup_ipmap(htonl(session[i].ip));
4831
4832 if (session[i].ip_pool_index < 0)
4833 {
4834 // Not allocated out of the pool.
4835 if (ipid < 1) // Not found in the pool either? good.
4836 continue;
4837
4838 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4839 i, fmtaddr(session[i].ip, 0), ipid);
4840
4841 // Fall through and process it as part of the pool.
4842 }
4843
4844
4845 if (ipid > MAXIPPOOL || ipid < 0)
4846 {
4847 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4848 ipid = -1;
4849 session[i].ip_pool_index = ipid;
4850 continue;
4851 }
4852
4853 ip_address_pool[ipid].assigned = 1;
4854 ip_address_pool[ipid].session = i;
4855 ip_address_pool[ipid].last = time_now;
4856 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4857 session[i].ip_pool_index = ipid;
4858 cache_ipmap(session[i].ip, i); // Fix the ip map.
4859 }
4860 }
4861
4862 //
4863 // Fix the address pool to match a changed session.
4864 // (usually when the master sends us an update).
4865 static void fix_address_pool(int sid)
4866 {
4867 int ipid;
4868
4869 ipid = session[sid].ip_pool_index;
4870
4871 if (ipid > ip_pool_size)
4872 return; // Ignore it. rebuild_address_pool will fix it up.
4873
4874 if (ip_address_pool[ipid].address != session[sid].ip)
4875 return; // Just ignore it. rebuild_address_pool will take care of it.
4876
4877 ip_address_pool[ipid].assigned = 1;
4878 ip_address_pool[ipid].session = sid;
4879 ip_address_pool[ipid].last = time_now;
4880 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4881 }
4882
4883 //
4884 // Add a block of addresses to the IP pool to hand out.
4885 //
4886 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4887 {
4888 int i;
4889 if (prefixlen == 0)
4890 prefixlen = 32; // Host route only.
4891
4892 addr &= 0xffffffff << (32 - prefixlen);
4893
4894 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4895 return ;
4896
4897 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4898 {
4899 if ((i & 0xff) == 0 || (i&0xff) == 255)
4900 continue; // Skip 0 and broadcast addresses.
4901
4902 ip_address_pool[ip_pool_size].address = i;
4903 ip_address_pool[ip_pool_size].assigned = 0;
4904 ++ip_pool_size;
4905 if (ip_pool_size >= MAXIPPOOL)
4906 {
4907 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4908 return;
4909 }
4910 }
4911 }
4912
4913 // Initialize the IP address pool
4914 static void initippool()
4915 {
4916 FILE *f;
4917 char *p;
4918 char buf[4096];
4919 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4920
4921 if (!(f = fopen(IPPOOLFILE, "r")))
4922 {
4923 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4924 exit(1);
4925 }
4926
4927 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4928 {
4929 char *pool = buf;
4930 buf[4095] = 0; // Force it to be zero terminated/
4931
4932 if (*buf == '#' || *buf == '\n')
4933 continue; // Skip comments / blank lines
4934 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4935 if ((p = (char *)strchr(buf, ':')))
4936 {
4937 in_addr_t src;
4938 *p = '\0';
4939 src = inet_addr(buf);
4940 if (src == INADDR_NONE)
4941 {
4942 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4943 exit(1);
4944 }
4945 // This entry is for a specific IP only
4946 if (src != config->bind_address)
4947 continue;
4948 *p = ':';
4949 pool = p+1;
4950 }
4951 if ((p = (char *)strchr(pool, '/')))
4952 {
4953 // It's a range
4954 int numbits = 0;
4955 in_addr_t start = 0;
4956
4957 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4958 *p++ = 0;
4959 if (!*p || !(numbits = atoi(p)))
4960 {
4961 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4962 continue;
4963 }
4964 start = ntohl(inet_addr(pool));
4965
4966 // Add a static route for this pool
4967 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4968 fmtaddr(htonl(start), 0), numbits);
4969
4970 routeset(0, start, numbits, 0, 1);
4971
4972 add_to_ip_pool(start, numbits);
4973 }
4974 else
4975 {
4976 // It's a single ip address
4977 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4978 }
4979 }
4980 fclose(f);
4981 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4982 }
4983
4984 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4985 {
4986 struct sockaddr_in snoop_addr = {0};
4987 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4988 return;
4989
4990 snoop_addr.sin_family = AF_INET;
4991 snoop_addr.sin_addr.s_addr = destination;
4992 snoop_addr.sin_port = ntohs(port);
4993
4994 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4995 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4996 htons(snoop_addr.sin_port));
4997
4998 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4999 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
5000
5001 STAT(packets_snooped);
5002 }
5003
5004 static int dump_session(FILE **f, sessiont *s)
5005 {
5006 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
5007 return 1;
5008
5009 if (!*f)
5010 {
5011 char filename[1024];
5012 char timestr[64];
5013 time_t now = time(NULL);
5014
5015 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
5016 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
5017
5018 if (!(*f = fopen(filename, "w")))
5019 {
5020 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
5021 return 0;
5022 }
5023
5024 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
5025 if(config->account_all_origin)
5026 {
5027 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
5028 "# host: %s\n"
5029 "# endpoint: %s\n"
5030 "# time: %ld\n"
5031 "# uptime: %ld\n"
5032 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
5033 hostname,
5034 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5035 now,
5036 now - basetime);
5037 }
5038 else
5039 {
5040 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
5041 "# host: %s\n"
5042 "# endpoint: %s\n"
5043 "# time: %ld\n"
5044 "# uptime: %ld\n"
5045 "# format: username ip qos uptxoctets downrxoctets\n",
5046 hostname,
5047 fmtaddr(config->iftun_n_address[tunnel[s->tunnel].indexudp] ? config->iftun_n_address[tunnel[s->tunnel].indexudp] : my_address, 0),
5048 now,
5049 now - basetime);
5050 }
5051 }
5052
5053 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
5054 if(config->account_all_origin)
5055 {
5056 fprintf(*f, "%s %s %d %u %u %s\n",
5057 s->user, // username
5058 fmtaddr(htonl(s->ip), 0), // ip
5059 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5060 (uint32_t) s->cin_delta, // uptxoctets
5061 (uint32_t) s->cout_delta, // downrxoctets
5062 (s->tunnel == TUNNEL_ID_PPPOE)?"P":(tunnel[s->tunnel].isremotelns?"R":"L")); // Origin
5063 }
5064 else if (!tunnel[s->tunnel].isremotelns && (s->tunnel != TUNNEL_ID_PPPOE))
5065 {
5066 fprintf(*f, "%s %s %d %u %u\n",
5067 s->user, // username
5068 fmtaddr(htonl(s->ip), 0), // ip
5069 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
5070 (uint32_t) s->cin_delta, // uptxoctets
5071 (uint32_t) s->cout_delta); // downrxoctets
5072 }
5073
5074 s->cin_delta = s->cout_delta = 0;
5075
5076 return 1;
5077 }
5078
5079 static void dump_acct_info(int all)
5080 {
5081 int i;
5082 FILE *f = NULL;
5083
5084
5085 CSTAT(dump_acct_info);
5086
5087 if (shut_acct_n)
5088 {
5089 for (i = 0; i < shut_acct_n; i++)
5090 dump_session(&f, &shut_acct[i]);
5091
5092 shut_acct_n = 0;
5093 }
5094
5095 if (all)
5096 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5097 dump_session(&f, &session[i]);
5098
5099 if (f)
5100 fclose(f);
5101 }
5102
5103 // Main program
5104 int main(int argc, char *argv[])
5105 {
5106 int i;
5107 int optdebug = 0;
5108 char *optconfig = CONFIGFILE;
5109
5110 time(&basetime); // start clock
5111
5112 // scan args
5113 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5114 {
5115 switch (i)
5116 {
5117 case 'd':
5118 if (fork()) exit(0);
5119 setsid();
5120 if(!freopen("/dev/null", "r", stdin)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno));
5121 if(!freopen("/dev/null", "w", stdout)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno));
5122 if(!freopen("/dev/null", "w", stderr)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno));
5123 break;
5124 case 'v':
5125 optdebug++;
5126 break;
5127 case 'c':
5128 optconfig = optarg;
5129 break;
5130 case 'h':
5131 snprintf(hostname, sizeof(hostname), "%s", optarg);
5132 break;
5133 default:
5134 printf("Args are:\n"
5135 "\t-d\t\tDetach from terminal\n"
5136 "\t-c <file>\tConfig file\n"
5137 "\t-h <hostname>\tForce hostname\n"
5138 "\t-v\t\tDebug\n");
5139
5140 return (0);
5141 break;
5142 }
5143 }
5144
5145 // Start the timer routine off
5146 time(&time_now);
5147 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5148
5149 initplugins();
5150 initdata(optdebug, optconfig);
5151
5152 init_cli();
5153 read_config_file();
5154 /* set hostname /after/ having read the config file */
5155 if (*config->hostname)
5156 strcpy(hostname, config->hostname);
5157 cli_init_complete(hostname);
5158 update_config();
5159 init_tbf(config->num_tbfs);
5160
5161 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5162 LOG(0, 0, 0, "Copyright (c) 2012, 2013, 2014 ISP FDN & SAMESWIRELESS\n");
5163 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5164 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5165 {
5166 struct rlimit rlim;
5167 rlim.rlim_cur = RLIM_INFINITY;
5168 rlim.rlim_max = RLIM_INFINITY;
5169 // Remove the maximum core size
5170 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5171 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5172
5173 // Make core dumps go to /tmp
5174 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno));
5175 }
5176
5177 if (config->scheduler_fifo)
5178 {
5179 int ret;
5180 struct sched_param params = {0};
5181 params.sched_priority = 1;
5182
5183 if (get_nprocs() < 2)
5184 {
5185 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5186 config->scheduler_fifo = 0;
5187 }
5188 else
5189 {
5190 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5191 {
5192 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5193 }
5194 else
5195 {
5196 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5197 config->scheduler_fifo = 0;
5198 }
5199 }
5200 }
5201
5202 initnetlink();
5203
5204 /* Set up the cluster communications port. */
5205 if (cluster_init() < 0)
5206 exit(1);
5207
5208 inittun();
5209 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5210
5211 if (*config->pppoe_if_to_bind)
5212 {
5213 init_pppoe();
5214 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5215 }
5216
5217 if (!config->nbmultiaddress)
5218 {
5219 config->bind_n_address[0] = config->bind_address;
5220 config->nbmultiaddress++;
5221 }
5222 config->nbudpfd = config->nbmultiaddress;
5223 for (i = 0; i < config->nbudpfd; i++)
5224 initudp(&udpfd[i], config->bind_n_address[i]);
5225 initlacudp();
5226 config->indexlacudpfd = config->nbudpfd;
5227 udpfd[config->indexlacudpfd] = udplacfd;
5228 config->nbudpfd++;
5229
5230 initcontrol();
5231 initdae();
5232
5233 // Intercept
5234 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
5235
5236 initrad();
5237 initippool();
5238 dhcpv6_init();
5239
5240 // seed prng
5241 {
5242 unsigned seed = time_now ^ getpid();
5243 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5244 srand(seed);
5245 }
5246
5247 signal(SIGHUP, sighup_handler);
5248 signal(SIGCHLD, sigchild_handler);
5249 signal(SIGTERM, shutdown_handler);
5250 signal(SIGINT, shutdown_handler);
5251 signal(SIGQUIT, shutdown_handler);
5252
5253 // Prevent us from getting paged out
5254 if (config->lock_pages)
5255 {
5256 if (!mlockall(MCL_CURRENT))
5257 LOG(1, 0, 0, "Locking pages into memory\n");
5258 else
5259 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5260 }
5261
5262 mainloop();
5263
5264 /* remove plugins (so cleanup code gets run) */
5265 plugins_done();
5266
5267 // Remove the PID file if we wrote it
5268 if (config->wrote_pid && *config->pid_file == '/')
5269 unlink(config->pid_file);
5270
5271 /* kill CLI children */
5272 signal(SIGTERM, SIG_IGN);
5273 kill(0, SIGTERM);
5274 return 0;
5275 }
5276
5277 static void sighup_handler(int sig)
5278 {
5279 main_reload++;
5280 }
5281
5282 static void shutdown_handler(int sig)
5283 {
5284 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5285 }
5286
5287 static void sigchild_handler(int sig)
5288 {
5289 while (waitpid(-1, NULL, WNOHANG) > 0)
5290 ;
5291 }
5292
5293 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5294 {
5295 MD5_CTX ctx;
5296 *challenge_response = NULL;
5297
5298 if (!*config->l2tp_secret)
5299 {
5300 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5301 return;
5302 }
5303
5304 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5305
5306 *challenge_response = calloc(17, 1);
5307
5308 MD5_Init(&ctx);
5309 MD5_Update(&ctx, &id, 1);
5310 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5311 MD5_Update(&ctx, challenge, challenge_length);
5312 MD5_Final(*challenge_response, &ctx);
5313
5314 return;
5315 }
5316
5317 static int facility_value(char *name)
5318 {
5319 int i;
5320 for (i = 0; facilitynames[i].c_name; i++)
5321 {
5322 if (strcmp(facilitynames[i].c_name, name) == 0)
5323 return facilitynames[i].c_val;
5324 }
5325 return 0;
5326 }
5327
5328 static void update_config()
5329 {
5330 int i;
5331 char *p;
5332 static int timeout = 0;
5333 static int interval = 0;
5334
5335 // Update logging
5336 closelog();
5337 syslog_log = 0;
5338 if (log_stream)
5339 {
5340 if (log_stream != stderr)
5341 fclose(log_stream);
5342
5343 log_stream = NULL;
5344 }
5345
5346 if (*config->log_filename)
5347 {
5348 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5349 {
5350 char *p = config->log_filename + 7;
5351 if (*p)
5352 {
5353 openlog("l2tpns", LOG_PID, facility_value(p));
5354 syslog_log = 1;
5355 }
5356 }
5357 else if (strchr(config->log_filename, '/') == config->log_filename)
5358 {
5359 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5360 {
5361 fseek(log_stream, 0, SEEK_END);
5362 setbuf(log_stream, NULL);
5363 }
5364 else
5365 {
5366 log_stream = stderr;
5367 setbuf(log_stream, NULL);
5368 }
5369 }
5370 }
5371 else
5372 {
5373 log_stream = stderr;
5374 setbuf(log_stream, NULL);
5375 }
5376
5377 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5378 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5379
5380 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5381 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5382 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5383
5384 // reset MRU/MSS globals
5385 MRU = config->l2tp_mtu - L2TP_HDRS;
5386 if (MRU > PPPoE_MRU)
5387 MRU = PPPoE_MRU;
5388
5389 MSS = MRU - TCP_HDRS;
5390
5391 // Update radius
5392 config->numradiusservers = 0;
5393 for (i = 0; i < MAXRADSERVER; i++)
5394 if (config->radiusserver[i])
5395 {
5396 config->numradiusservers++;
5397 // Set radius port: if not set, take the port from the
5398 // first radius server. For the first radius server,
5399 // take the #defined default value from l2tpns.h
5400
5401 // test twice, In case someone works with
5402 // a secondary radius server without defining
5403 // a primary one, this will work even then.
5404 if (i > 0 && !config->radiusport[i])
5405 config->radiusport[i] = config->radiusport[i-1];
5406 if (!config->radiusport[i])
5407 config->radiusport[i] = RADPORT;
5408 }
5409
5410 if (!config->numradiusservers)
5411 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5412
5413 // parse radius_authtypes_s
5414 config->radius_authtypes = config->radius_authprefer = 0;
5415 p = config->radius_authtypes_s;
5416 while (p && *p)
5417 {
5418 char *s = strpbrk(p, " \t,");
5419 int type = 0;
5420
5421 if (s)
5422 {
5423 *s++ = 0;
5424 while (*s == ' ' || *s == '\t')
5425 s++;
5426
5427 if (!*s)
5428 s = 0;
5429 }
5430
5431 if (!strncasecmp("chap", p, strlen(p)))
5432 type = AUTHCHAP;
5433 else if (!strncasecmp("pap", p, strlen(p)))
5434 type = AUTHPAP;
5435 else
5436 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5437
5438 config->radius_authtypes |= type;
5439 if (!config->radius_authprefer)
5440 config->radius_authprefer = type;
5441
5442 p = s;
5443 }
5444
5445 if (!config->radius_authtypes)
5446 {
5447 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5448 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5449 }
5450
5451 // normalise radius_authtypes_s
5452 if (config->radius_authprefer == AUTHPAP)
5453 {
5454 strcpy(config->radius_authtypes_s, "pap");
5455 if (config->radius_authtypes & AUTHCHAP)
5456 strcat(config->radius_authtypes_s, ", chap");
5457 }
5458 else
5459 {
5460 strcpy(config->radius_authtypes_s, "chap");
5461 if (config->radius_authtypes & AUTHPAP)
5462 strcat(config->radius_authtypes_s, ", pap");
5463 }
5464
5465 if (!config->radius_dae_port)
5466 config->radius_dae_port = DAEPORT;
5467
5468 if(!config->bind_portremotelns)
5469 config->bind_portremotelns = L2TPLACPORT;
5470 if(!config->bind_address_remotelns)
5471 config->bind_address_remotelns = INADDR_ANY;
5472
5473 if (*config->bind_multi_address)
5474 {
5475 char *sip = config->bind_multi_address;
5476 char *n = sip;
5477 char *e = config->bind_multi_address + strlen(config->bind_multi_address);
5478 config->nbmultiaddress = 0;
5479
5480 while (*sip && (sip < e))
5481 {
5482 in_addr_t ip = 0;
5483 uint8_t u = 0;
5484
5485 while (n < e && (*n == ',' || *n == ' ')) n++;
5486
5487 while (n < e && (isdigit(*n) || *n == '.'))
5488 {
5489 if (*n == '.')
5490 {
5491 ip = (ip << 8) + u;
5492 u = 0;
5493 }
5494 else
5495 u = u * 10 + *n - '0';
5496 n++;
5497 }
5498 ip = (ip << 8) + u;
5499 n++;
5500
5501 if (ip)
5502 {
5503 config->bind_n_address[config->nbmultiaddress] = htonl(ip);
5504 config->iftun_n_address[config->nbmultiaddress] = htonl(ip);
5505 config->nbmultiaddress++;
5506 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip), 0));
5507
5508 if (config->nbmultiaddress >= MAX_BINDADDR) break;
5509 }
5510
5511 sip = n;
5512 }
5513
5514 if (config->nbmultiaddress >= 1)
5515 {
5516 config->bind_address = config->bind_n_address[0];
5517 config->iftun_address = config->bind_address;
5518 }
5519 }
5520
5521 if(!config->iftun_address)
5522 {
5523 config->iftun_address = config->bind_address;
5524 config->iftun_n_address[0] = config->iftun_address;
5525 }
5526
5527 if (*config->multi_hostname)
5528 {
5529 char *shost = config->multi_hostname;
5530 char *n = shost;
5531 char *e = config->multi_hostname + strlen(config->multi_hostname);
5532 config->nbmultihostname = 0;
5533
5534 while (*shost && (shost < e))
5535 {
5536 while ((n < e) && (*n == ' ' || *n == ',' || *n == '\t')) n++;
5537
5538 i = 0;
5539 while (n < e && (*n != ',') && (*n != '\t'))
5540 {
5541 config->multi_n_hostname[config->nbmultihostname][i] = *n;
5542 n++;i++;
5543 }
5544
5545 if (i > 0)
5546 {
5547 config->multi_n_hostname[config->nbmultihostname][i] = 0;
5548 LOG(1, 0, 0, "Bind Hostname %s\n", config->multi_n_hostname[config->nbmultihostname]);
5549 config->nbmultihostname++;
5550 if (config->nbmultihostname >= MAX_NBHOSTNAME) break;
5551 }
5552
5553 shost = n;
5554 }
5555
5556 if (config->nbmultihostname >= 1)
5557 {
5558 strcpy(hostname, config->multi_n_hostname[0]);
5559 strcpy(config->hostname, hostname);
5560 }
5561 }
5562
5563 if (!*config->pppoe_ac_name)
5564 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5565
5566 // re-initialise the random number source
5567 initrandom(config->random_device);
5568
5569 // Update plugins
5570 for (i = 0; i < MAXPLUGINS; i++)
5571 {
5572 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5573 continue;
5574
5575 if (*config->plugins[i])
5576 {
5577 // Plugin added
5578 add_plugin(config->plugins[i]);
5579 }
5580 else if (*config->old_plugins[i])
5581 {
5582 // Plugin removed
5583 remove_plugin(config->old_plugins[i]);
5584 }
5585 }
5586
5587 // Guest change
5588 guest_accounts_num = 0;
5589 char *p2 = config->guest_user;
5590 while (p2 && *p2)
5591 {
5592 char *s = strpbrk(p2, " \t,");
5593 if (s)
5594 {
5595 *s++ = 0;
5596 while (*s == ' ' || *s == '\t')
5597 s++;
5598
5599 if (!*s)
5600 s = 0;
5601 }
5602
5603 strcpy(guest_users[guest_accounts_num], p2);
5604 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5605 guest_accounts_num++;
5606 p2 = s;
5607 }
5608 // Rebuild the guest_user array
5609 strcpy(config->guest_user, "");
5610 int ui = 0;
5611 for (ui=0; ui<guest_accounts_num; ui++)
5612 {
5613 strcat(config->guest_user, guest_users[ui]);
5614 if (ui<guest_accounts_num-1)
5615 {
5616 strcat(config->guest_user, ",");
5617 }
5618 }
5619
5620
5621 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5622 if (!config->multi_read_count) config->multi_read_count = 10;
5623 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5624 if (!*config->cluster_interface)
5625 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5626
5627 if (!config->cluster_hb_interval)
5628 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5629
5630 if (!config->cluster_hb_timeout)
5631 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5632
5633 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5634 {
5635 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5636 // late, ensure we're sufficiently larger than that
5637 int t = 4 * config->cluster_hb_interval + 11;
5638
5639 if (config->cluster_hb_timeout < t)
5640 {
5641 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5642 config->cluster_hb_timeout = t;
5643 }
5644
5645 // Push timing changes to the slaves immediately if we're the master
5646 if (config->cluster_iam_master)
5647 cluster_heartbeat();
5648
5649 interval = config->cluster_hb_interval;
5650 timeout = config->cluster_hb_timeout;
5651 }
5652
5653 // Write PID file
5654 if (*config->pid_file == '/' && !config->wrote_pid)
5655 {
5656 FILE *f;
5657 if ((f = fopen(config->pid_file, "w")))
5658 {
5659 fprintf(f, "%d\n", getpid());
5660 fclose(f);
5661 config->wrote_pid = 1;
5662 }
5663 else
5664 {
5665 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5666 }
5667 }
5668 }
5669
5670 static void read_config_file()
5671 {
5672 FILE *f;
5673
5674 if (!config->config_file) return;
5675 if (!(f = fopen(config->config_file, "r")))
5676 {
5677 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5678 return;
5679 }
5680
5681 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5682 cli_do_file(f);
5683 LOG(3, 0, 0, "Done reading config file\n");
5684 fclose(f);
5685 }
5686
5687 int sessionsetup(sessionidt s, tunnelidt t)
5688 {
5689 // A session now exists, set it up
5690 in_addr_t ip;
5691 char *user;
5692 sessionidt i;
5693 int r;
5694
5695 CSTAT(sessionsetup);
5696
5697 LOG(3, s, t, "Doing session setup for session\n");
5698
5699 // Join a bundle if the MRRU option is accepted
5700 if(session[s].mrru > 0 && session[s].bundle == 0)
5701 {
5702 LOG(3, s, t, "This session can be part of multilink bundle\n");
5703 if (join_bundle(s) > 0)
5704 cluster_send_bundle(session[s].bundle);
5705 else
5706 {
5707 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5708 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5709 return 0;
5710 }
5711 }
5712
5713 if (!session[s].ip)
5714 {
5715 assign_ip_address(s);
5716 if (!session[s].ip)
5717 {
5718 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5719 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5720 return 0;
5721 }
5722 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5723 fmtaddr(htonl(session[s].ip), 0));
5724 }
5725
5726 // Make sure this is right
5727 session[s].tunnel = t;
5728
5729 // zap old sessions with same IP and/or username
5730 // Don't kill gardened sessions - doing so leads to a DoS
5731 // from someone who doesn't need to know the password
5732 {
5733 ip = session[s].ip;
5734 user = session[s].user;
5735 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5736 {
5737 if (i == s) continue;
5738 if (!session[s].opened) break;
5739 // Allow duplicate sessions for multilink ones of the same bundle.
5740 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5741
5742 if (ip == session[i].ip)
5743 {
5744 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5745 continue;
5746 }
5747
5748 if (config->allow_duplicate_users) continue;
5749 if (session[s].walled_garden || session[i].walled_garden) continue;
5750 // Guest change
5751 int found = 0;
5752 int gu;
5753 for (gu = 0; gu < guest_accounts_num; gu++)
5754 {
5755 if (!strcasecmp(user, guest_users[gu]))
5756 {
5757 found = 1;
5758 break;
5759 }
5760 }
5761 if (found) continue;
5762
5763 // Drop the new session in case of duplicate sessionss, not the old one.
5764 if (!strcasecmp(user, session[i].user))
5765 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5766 }
5767 }
5768
5769 // no need to set a route for the same IP address of the bundle
5770 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5771 {
5772 int routed = 0;
5773
5774 // Add the route for this session.
5775 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5776 {
5777 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5778 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5779 routed++;
5780
5781 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5782 }
5783
5784 // Static IPs need to be routed if not already
5785 // convered by a Framed-Route. Anything else is part
5786 // of the IP address pool and is already routed, it
5787 // just needs to be added to the IP cache.
5788 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5789 if (session[s].ip_pool_index == -1) // static ip
5790 {
5791 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5792 }
5793 else
5794 cache_ipmap(session[s].ip, s);
5795 }
5796
5797 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5798 lcp_open(s, t); // transition to Network phase and send initial IPCP
5799
5800 // Run the plugin's against this new session.
5801 {
5802 struct param_new_session data = { &tunnel[t], &session[s] };
5803 run_plugins(PLUGIN_NEW_SESSION, &data);
5804 }
5805
5806 // Allocate TBFs if throttled
5807 if (session[s].throttle_in || session[s].throttle_out)
5808 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5809
5810 session[s].last_packet = session[s].last_data = time_now;
5811
5812 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5813 fmtaddr(htonl(session[s].ip), 0),
5814 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5815
5816 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5817
5818 return 1; // RADIUS OK and IP allocated, done...
5819 }
5820
5821 //
5822 // This session just got dropped on us by the master or something.
5823 // Make sure our tables up up to date...
5824 //
5825 int load_session(sessionidt s, sessiont *new)
5826 {
5827 int i;
5828 int newip = 0;
5829
5830 // Sanity checks.
5831 if (new->ip_pool_index >= MAXIPPOOL ||
5832 new->tunnel >= MAXTUNNEL)
5833 {
5834 LOG(0, s, 0, "Strange session update received!\n");
5835 // FIXME! What to do here?
5836 return 0;
5837 }
5838
5839 //
5840 // Ok. All sanity checks passed. Now we're committed to
5841 // loading the new session.
5842 //
5843
5844 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5845
5846 // See if routes/ip cache need updating
5847 if (new->ip != session[s].ip)
5848 newip++;
5849
5850 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5851 if (new->route[i].ip != session[s].route[i].ip ||
5852 new->route[i].prefixlen != session[s].route[i].prefixlen)
5853 newip++;
5854
5855 // needs update
5856 if (newip)
5857 {
5858 int routed = 0;
5859
5860 // remove old routes...
5861 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5862 {
5863 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5864 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5865 routed++;
5866
5867 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5868 }
5869
5870 // ...ip
5871 if (session[s].ip)
5872 {
5873 if (session[s].ip_pool_index == -1) // static IP
5874 {
5875 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5876 }
5877 else // It's part of the IP pool, remove it manually.
5878 uncache_ipmap(session[s].ip);
5879 }
5880
5881 // remove old IPV6 routes...
5882 for (i = 0; i < MAXROUTE6 && session[s].route6[i].ipv6route.s6_addr[0] && session[s].route6[i].ipv6prefixlen; i++)
5883 {
5884 route6set(s, session[s].route6[i].ipv6route, session[s].route6[i].ipv6prefixlen, 0);
5885 }
5886
5887 if (session[s].ipv6address.s6_addr[0])
5888 {
5889 route6set(s, session[s].ipv6address, 128, 0);
5890 }
5891
5892 routed = 0;
5893
5894 // add new routes...
5895 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5896 {
5897 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5898 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5899 routed++;
5900
5901 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5902 }
5903
5904 // ...ip
5905 if (new->ip)
5906 {
5907 // If there's a new one, add it.
5908 if (new->ip_pool_index == -1)
5909 {
5910 if (!routed) routeset(s, new->ip, 0, 0, 1);
5911 }
5912 else
5913 cache_ipmap(new->ip, s);
5914 }
5915 }
5916
5917 // check v6 routing
5918 if (new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5919 {
5920 for (i = 0; i < MAXROUTE6 && new->route6[i].ipv6prefixlen; i++)
5921 {
5922 route6set(s, new->route6[i].ipv6route, new->route6[i].ipv6prefixlen, 1);
5923 }
5924 }
5925
5926 if (new->ipv6address.s6_addr[0] && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5927 {
5928 // Check if included in prefix
5929 if (sessionbyipv6(new->ipv6address) != s)
5930 route6set(s, new->ipv6address, 128, 1);
5931 }
5932
5933 // check filters
5934 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5935 {
5936 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5937 new->filter_in = 0;
5938 }
5939
5940 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5941 {
5942 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5943 new->filter_out = 0;
5944 }
5945
5946 if (new->filter_in != session[s].filter_in)
5947 {
5948 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5949 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5950 }
5951
5952 if (new->filter_out != session[s].filter_out)
5953 {
5954 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5955 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5956 }
5957
5958 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5959 // for walking the sessions to forward byte counts to the master.
5960 config->cluster_highest_sessionid = s;
5961
5962 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5963
5964 // Do fixups into address pool.
5965 if (new->ip_pool_index != -1)
5966 fix_address_pool(s);
5967
5968 return 1;
5969 }
5970
5971 static void initplugins()
5972 {
5973 int i;
5974
5975 loaded_plugins = ll_init();
5976 // Initialize the plugins to nothing
5977 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5978 plugins[i] = ll_init();
5979 }
5980
5981 static void *open_plugin(char *plugin_name, int load)
5982 {
5983 char path[256] = "";
5984
5985 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5986 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5987 return dlopen(path, RTLD_NOW);
5988 }
5989
5990 // plugin callback to get a config value
5991 static void *getconfig(char *key, enum config_typet type)
5992 {
5993 int i;
5994
5995 for (i = 0; config_values[i].key; i++)
5996 {
5997 if (!strcmp(config_values[i].key, key))
5998 {
5999 if (config_values[i].type == type)
6000 return ((void *) config) + config_values[i].offset;
6001
6002 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
6003 key, type, config_values[i].type);
6004
6005 return 0;
6006 }
6007 }
6008
6009 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
6010 return 0;
6011 }
6012
6013 static int add_plugin(char *plugin_name)
6014 {
6015 static struct pluginfuncs funcs = {
6016 _log,
6017 _log_hex,
6018 fmtaddr,
6019 sessionbyuser,
6020 sessiontbysessionidt,
6021 sessionidtbysessiont,
6022 radiusnew,
6023 radiussend,
6024 getconfig,
6025 sessionshutdown,
6026 sessionkill,
6027 throttle_session,
6028 cluster_send_session,
6029 };
6030
6031 void *p = open_plugin(plugin_name, 1);
6032 int (*initfunc)(struct pluginfuncs *);
6033 int i;
6034
6035 if (!p)
6036 {
6037 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
6038 return -1;
6039 }
6040
6041 if (ll_contains(loaded_plugins, p))
6042 {
6043 dlclose(p);
6044 return 0; // already loaded
6045 }
6046
6047 {
6048 int *v = dlsym(p, "plugin_api_version");
6049 if (!v || *v != PLUGIN_API_VERSION)
6050 {
6051 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
6052 dlclose(p);
6053 return -1;
6054 }
6055 }
6056
6057 if ((initfunc = dlsym(p, "plugin_init")))
6058 {
6059 if (!initfunc(&funcs))
6060 {
6061 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6062 dlclose(p);
6063 return -1;
6064 }
6065 }
6066
6067 ll_push(loaded_plugins, p);
6068
6069 for (i = 0; i < max_plugin_functions; i++)
6070 {
6071 void *x;
6072 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6073 {
6074 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
6075 ll_push(plugins[i], x);
6076 }
6077 }
6078
6079 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
6080 return 1;
6081 }
6082
6083 static void run_plugin_done(void *plugin)
6084 {
6085 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
6086
6087 if (donefunc)
6088 donefunc();
6089 }
6090
6091 static int remove_plugin(char *plugin_name)
6092 {
6093 void *p = open_plugin(plugin_name, 0);
6094 int loaded = 0;
6095
6096 if (!p)
6097 return -1;
6098
6099 if (ll_contains(loaded_plugins, p))
6100 {
6101 int i;
6102 for (i = 0; i < max_plugin_functions; i++)
6103 {
6104 void *x;
6105 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
6106 ll_delete(plugins[i], x);
6107 }
6108
6109 ll_delete(loaded_plugins, p);
6110 run_plugin_done(p);
6111 loaded = 1;
6112 }
6113
6114 dlclose(p);
6115 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
6116 return loaded;
6117 }
6118
6119 int run_plugins(int plugin_type, void *data)
6120 {
6121 int (*func)(void *data);
6122
6123 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
6124 return PLUGIN_RET_ERROR;
6125
6126 ll_reset(plugins[plugin_type]);
6127 while ((func = ll_next(plugins[plugin_type])))
6128 {
6129 int r = func(data);
6130
6131 if (r != PLUGIN_RET_OK)
6132 return r; // stop here
6133 }
6134
6135 return PLUGIN_RET_OK;
6136 }
6137
6138 static void plugins_done()
6139 {
6140 void *p;
6141
6142 ll_reset(loaded_plugins);
6143 while ((p = ll_next(loaded_plugins)))
6144 run_plugin_done(p);
6145 }
6146
6147 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
6148 {
6149 struct nsctl request;
6150 struct nsctl response;
6151 int type = unpack_control(&request, buf, len);
6152 int r;
6153 void *p;
6154
6155 if (log_stream && config->debug >= 4)
6156 {
6157 if (type < 0)
6158 {
6159 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6160 fmtaddr(addr->sin_addr.s_addr, 0), type);
6161 }
6162 else
6163 {
6164 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6165 dump_control(&request, log_stream);
6166 }
6167 }
6168
6169 switch (type)
6170 {
6171 case NSCTL_REQ_LOAD:
6172 if (request.argc != 1)
6173 {
6174 response.type = NSCTL_RES_ERR;
6175 response.argc = 1;
6176 response.argv[0] = "name of plugin required";
6177 }
6178 else if ((r = add_plugin(request.argv[0])) < 1)
6179 {
6180 response.type = NSCTL_RES_ERR;
6181 response.argc = 1;
6182 response.argv[0] = !r
6183 ? "plugin already loaded"
6184 : "error loading plugin";
6185 }
6186 else
6187 {
6188 response.type = NSCTL_RES_OK;
6189 response.argc = 0;
6190 }
6191
6192 break;
6193
6194 case NSCTL_REQ_UNLOAD:
6195 if (request.argc != 1)
6196 {
6197 response.type = NSCTL_RES_ERR;
6198 response.argc = 1;
6199 response.argv[0] = "name of plugin required";
6200 }
6201 else if ((r = remove_plugin(request.argv[0])) < 1)
6202 {
6203 response.type = NSCTL_RES_ERR;
6204 response.argc = 1;
6205 response.argv[0] = !r
6206 ? "plugin not loaded"
6207 : "plugin not found";
6208 }
6209 else
6210 {
6211 response.type = NSCTL_RES_OK;
6212 response.argc = 0;
6213 }
6214
6215 break;
6216
6217 case NSCTL_REQ_HELP:
6218 response.type = NSCTL_RES_OK;
6219 response.argc = 0;
6220
6221 ll_reset(loaded_plugins);
6222 while ((p = ll_next(loaded_plugins)))
6223 {
6224 char **help = dlsym(p, "plugin_control_help");
6225 while (response.argc < 0xff && help && *help)
6226 response.argv[response.argc++] = *help++;
6227 }
6228
6229 break;
6230
6231 case NSCTL_REQ_CONTROL:
6232 {
6233 struct param_control param = {
6234 config->cluster_iam_master,
6235 request.argc,
6236 request.argv,
6237 0,
6238 NULL,
6239 };
6240
6241 int r = run_plugins(PLUGIN_CONTROL, &param);
6242
6243 if (r == PLUGIN_RET_ERROR)
6244 {
6245 response.type = NSCTL_RES_ERR;
6246 response.argc = 1;
6247 response.argv[0] = param.additional
6248 ? param.additional
6249 : "error returned by plugin";
6250 }
6251 else if (r == PLUGIN_RET_NOTMASTER)
6252 {
6253 static char msg[] = "must be run on master: 000.000.000.000";
6254
6255 response.type = NSCTL_RES_ERR;
6256 response.argc = 1;
6257 if (config->cluster_master_address)
6258 {
6259 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6260 response.argv[0] = msg;
6261 }
6262 else
6263 {
6264 response.argv[0] = "must be run on master: none elected";
6265 }
6266 }
6267 else if (!(param.response & NSCTL_RESPONSE))
6268 {
6269 response.type = NSCTL_RES_ERR;
6270 response.argc = 1;
6271 response.argv[0] = param.response
6272 ? "unrecognised response value from plugin"
6273 : "unhandled action";
6274 }
6275 else
6276 {
6277 response.type = param.response;
6278 response.argc = 0;
6279 if (param.additional)
6280 {
6281 response.argc = 1;
6282 response.argv[0] = param.additional;
6283 }
6284 }
6285 }
6286
6287 break;
6288
6289 default:
6290 response.type = NSCTL_RES_ERR;
6291 response.argc = 1;
6292 response.argv[0] = "error unpacking control packet";
6293 }
6294
6295 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6296 if (!buf)
6297 {
6298 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6299 return;
6300 }
6301
6302 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6303 if (r > 0)
6304 {
6305 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6306 if (log_stream && config->debug >= 4)
6307 {
6308 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6309 dump_control(&response, log_stream);
6310 }
6311 }
6312 else
6313 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6314 fmtaddr(addr->sin_addr.s_addr, 0), r);
6315
6316 free(buf);
6317 }
6318
6319 static tunnelidt new_tunnel()
6320 {
6321 tunnelidt i;
6322 for (i = 1; i < MAXTUNNEL; i++)
6323 {
6324 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6325 {
6326 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6327 if (i > config->cluster_highest_tunnelid)
6328 config->cluster_highest_tunnelid = i;
6329 return i;
6330 }
6331 }
6332 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6333 return 0;
6334 }
6335
6336 //
6337 // We're becoming the master. Do any required setup..
6338 //
6339 // This is principally telling all the plugins that we're
6340 // now a master, and telling them about all the sessions
6341 // that are active too..
6342 //
6343 void become_master(void)
6344 {
6345 int s, i;
6346 static struct event_data d[RADIUS_FDS];
6347 struct epoll_event e;
6348
6349 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6350
6351 // running a bunch of iptables commands is slow and can cause
6352 // the master to drop tunnels on takeover--kludge around the
6353 // problem by forking for the moment (note: race)
6354 if (!fork_and_close())
6355 {
6356 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6357 {
6358 if (!session[s].opened) // Not an in-use session.
6359 continue;
6360
6361 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6362 }
6363 exit(0);
6364 }
6365
6366 // add radius fds
6367 e.events = EPOLLIN;
6368 for (i = 0; i < RADIUS_FDS; i++)
6369 {
6370 d[i].type = FD_TYPE_RADIUS;
6371 d[i].index = i;
6372 e.data.ptr = &d[i];
6373
6374 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6375 }
6376 }
6377
6378 int cmd_show_hist_idle(struct cli_def *cli, const char *command, char **argv, int argc)
6379 {
6380 int s, i;
6381 int count = 0;
6382 int buckets[64];
6383
6384 if (CLI_HELP_REQUESTED)
6385 return CLI_HELP_NO_ARGS;
6386
6387 time(&time_now);
6388 for (i = 0; i < 64;++i) buckets[i] = 0;
6389
6390 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6391 {
6392 int idle;
6393 if (!session[s].opened)
6394 continue;
6395
6396 idle = time_now - session[s].last_data;
6397 idle /= 5 ; // In multiples of 5 seconds.
6398 if (idle < 0)
6399 idle = 0;
6400 if (idle > 63)
6401 idle = 63;
6402
6403 ++count;
6404 ++buckets[idle];
6405 }
6406
6407 for (i = 0; i < 63; ++i)
6408 {
6409 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6410 }
6411 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6412 cli_print(cli, "%d total sessions open.", count);
6413 return CLI_OK;
6414 }
6415
6416 int cmd_show_hist_open(struct cli_def *cli, const char *command, char **argv, int argc)
6417 {
6418 int s, i;
6419 int count = 0;
6420 int buckets[64];
6421
6422 if (CLI_HELP_REQUESTED)
6423 return CLI_HELP_NO_ARGS;
6424
6425 time(&time_now);
6426 for (i = 0; i < 64;++i) buckets[i] = 0;
6427
6428 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6429 {
6430 int open = 0, d;
6431 if (!session[s].opened)
6432 continue;
6433
6434 d = time_now - session[s].opened;
6435 if (d < 0)
6436 d = 0;
6437 while (d > 1 && open < 32)
6438 {
6439 ++open;
6440 d >>= 1; // half.
6441 }
6442 ++count;
6443 ++buckets[open];
6444 }
6445
6446 s = 1;
6447 for (i = 0; i < 30; ++i)
6448 {
6449 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6450 s <<= 1;
6451 }
6452 cli_print(cli, "%d total sessions open.", count);
6453 return CLI_OK;
6454 }
6455
6456 /* Unhide an avp.
6457 *
6458 * This unencodes the AVP using the L2TP secret and the previously
6459 * stored random vector. It overwrites the hidden data with the
6460 * unhidden AVP subformat.
6461 */
6462 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6463 {
6464 MD5_CTX ctx;
6465 uint8_t digest[16];
6466 uint8_t *last;
6467 size_t d = 0;
6468 uint16_t m = htons(type);
6469
6470 // Compute initial pad
6471 MD5_Init(&ctx);
6472 MD5_Update(&ctx, (unsigned char *) &m, 2);
6473 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6474 MD5_Update(&ctx, vector, vec_len);
6475 MD5_Final(digest, &ctx);
6476
6477 // pointer to last decoded 16 octets
6478 last = value;
6479
6480 while (len > 0)
6481 {
6482 // calculate a new pad based on the last decoded block
6483 if (d >= sizeof(digest))
6484 {
6485 MD5_Init(&ctx);
6486 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6487 MD5_Update(&ctx, last, sizeof(digest));
6488 MD5_Final(digest, &ctx);
6489
6490 d = 0;
6491 last = value;
6492 }
6493
6494 *value++ ^= digest[d++];
6495 len--;
6496 }
6497 }
6498
6499 int find_filter(char const *name, size_t len)
6500 {
6501 int free = -1;
6502 int i;
6503
6504 for (i = 0; i < MAXFILTER; i++)
6505 {
6506 if (!*ip_filters[i].name)
6507 {
6508 if (free < 0)
6509 free = i;
6510
6511 continue;
6512 }
6513
6514 if (strlen(ip_filters[i].name) != len)
6515 continue;
6516
6517 if (!strncmp(ip_filters[i].name, name, len))
6518 return i;
6519 }
6520
6521 return free;
6522 }
6523
6524 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6525 {
6526 switch (p->op)
6527 {
6528 case FILTER_PORT_OP_EQ: return port == p->port;
6529 case FILTER_PORT_OP_NEQ: return port != p->port;
6530 case FILTER_PORT_OP_GT: return port > p->port;
6531 case FILTER_PORT_OP_LT: return port < p->port;
6532 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6533 }
6534
6535 return 0;
6536 }
6537
6538 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6539 {
6540 switch (op)
6541 {
6542 case FILTER_FLAG_OP_ANY:
6543 return (flags & sflags) || (~flags & cflags);
6544
6545 case FILTER_FLAG_OP_ALL:
6546 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6547
6548 case FILTER_FLAG_OP_EST:
6549 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6550 }
6551
6552 return 0;
6553 }
6554
6555 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6556 {
6557 uint16_t frag_offset;
6558 uint8_t proto;
6559 in_addr_t src_ip;
6560 in_addr_t dst_ip;
6561 uint16_t src_port = 0;
6562 uint16_t dst_port = 0;
6563 uint8_t flags = 0;
6564 ip_filter_rulet *rule;
6565
6566 if (len < 20) // up to end of destination address
6567 return 0;
6568
6569 if ((*buf >> 4) != 4) // IPv4
6570 return 0;
6571
6572 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6573 proto = buf[9];
6574 src_ip = *(in_addr_t *) (buf + 12);
6575 dst_ip = *(in_addr_t *) (buf + 16);
6576
6577 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6578 {
6579 int l = (buf[0] & 0xf) * 4; // length of IP header
6580 if (len < l + 4) // ports
6581 return 0;
6582
6583 src_port = ntohs(*(uint16_t *) (buf + l));
6584 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6585 if (proto == IPPROTO_TCP)
6586 {
6587 if (len < l + 14) // flags
6588 return 0;
6589
6590 flags = buf[l + 13] & 0x3f;
6591 }
6592 }
6593
6594 for (rule = ip_filters[filter].rules; rule->action; rule++)
6595 {
6596 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6597 continue;
6598
6599 if (rule->src_wild != INADDR_BROADCAST &&
6600 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6601 continue;
6602
6603 if (rule->dst_wild != INADDR_BROADCAST &&
6604 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6605 continue;
6606
6607 if (frag_offset)
6608 {
6609 // layer 4 deny rules are skipped
6610 if (rule->action == FILTER_ACTION_DENY &&
6611 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6612 continue;
6613 }
6614 else
6615 {
6616 if (rule->frag)
6617 continue;
6618
6619 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6620 {
6621 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6622 continue;
6623
6624 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6625 continue;
6626
6627 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6628 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6629 continue;
6630 }
6631 }
6632
6633 // matched
6634 rule->counter++;
6635 return rule->action == FILTER_ACTION_PERMIT;
6636 }
6637
6638 // default deny
6639 return 0;
6640 }
6641
6642 tunnelidt lac_new_tunnel()
6643 {
6644 return new_tunnel();
6645 }
6646
6647 void lac_tunnelclear(tunnelidt t)
6648 {
6649 tunnelclear(t);
6650 }
6651
6652 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6653 {
6654 uint16_t version = 0x0100; // protocol version
6655
6656 tunnel[t].state = TUNNELOPENING;
6657
6658 // Sent SCCRQ - Start Control Connection Request
6659 controlt *c = controlnew(1); // sending SCCRQ
6660 controls(c, 7, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname, 1); // host name
6661 controls(c, 8, Vendor_name, 1); // Vendor name
6662 control16(c, 2, version, 1); // protocol version
6663 control32(c, 3, 3, 1); // framing Capabilities
6664 control16(c, 9, t, 1); // assigned tunnel
6665 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6666 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6667 controladd(c, 0, t); // send
6668 }
6669
6670 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6671 {
6672 // Sent ICRQ Incoming-call-request
6673 controlt *c = controlnew(10); // ICRQ
6674
6675 control16(c, 14, s, 1); // assigned sesion
6676 call_serial_number++;
6677 control32(c, 15, call_serial_number, 1); // call serial number
6678 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6679 controladd(c, 0, t); // send
6680 }
6681
6682 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6683 {
6684 tunnelshutdown(t, reason, result, error, msg);
6685 }
6686