ee9f30b3a4a25639b53da8a98eacd6f5499738a9
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 #include <arpa/inet.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <linux/if_tun.h>
12 #define SYSLOG_NAMES
13 #include <syslog.h>
14 #include <malloc.h>
15 #include <net/route.h>
16 #include <sys/mman.h>
17 #include <netdb.h>
18 #include <netinet/in.h>
19 #include <netinet/ip6.h>
20 #include <stdarg.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/wait.h>
31 #include <net/if.h>
32 #include <stddef.h>
33 #include <time.h>
34 #include <dlfcn.h>
35 #include <unistd.h>
36 #include <sched.h>
37 #include <sys/sysinfo.h>
38 #include <libcli.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
41
42 #include "md5.h"
43 #include "l2tpns.h"
44 #include "cluster.h"
45 #include "plugin.h"
46 #include "ll.h"
47 #include "constants.h"
48 #include "control.h"
49 #include "util.h"
50 #include "tbf.h"
51
52 #ifdef BGP
53 #include "bgp.h"
54 #endif
55
56 #ifdef LAC
57 #include "l2tplac.h"
58 #endif
59 #include "pppoe.h"
60
61 #ifdef LAC
62 char * Vendor_name = "Linux L2TPNS";
63 uint32_t call_serial_number = 0;
64 #endif
65
66 // Globals
67 configt *config = NULL; // all configuration
68 int nlfd = -1; // netlink socket
69 int tunfd = -1; // tun interface file handle. (network device)
70 int udpfd = -1; // UDP file handle
71 #ifdef LAC
72 int udplacfd = -1; // UDP LAC file handle
73 #endif
74 int controlfd = -1; // Control signal handle
75 int clifd = -1; // Socket listening for CLI connections.
76 int daefd = -1; // Socket listening for DAE connections.
77 int snoopfd = -1; // UDP file handle for sending out intercept data
78 int *radfds = NULL; // RADIUS requests file handles
79 int rand_fd = -1; // Random data source
80 int cluster_sockfd = -1; // Intra-cluster communications socket.
81 int epollfd = -1; // event polling
82 time_t basetime = 0; // base clock
83 char hostname[MAXHOSTNAME] = ""; // us.
84 static int tunidx; // ifr_ifindex of tun device
85 int nlseqnum = 0; // netlink sequence number
86 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
87 static int syslog_log = 0; // are we logging to syslog
88 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
89 uint32_t last_id = 0; // Unique ID for radius accounting
90 // Guest change
91 char guest_users[10][32]; // Array of guest users
92 int guest_accounts_num = 0; // Number of guest users
93
94 // calculated from config->l2tp_mtu
95 uint16_t MRU = 0; // PPP MRU
96 uint16_t MSS = 0; // TCP MSS
97
98 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
99 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
100
101 union iphash {
102 sessionidt sess;
103 union iphash *idx;
104 } ip_hash[256]; // Mapping from IP address to session structures.
105
106 struct ipv6radix {
107 sessionidt sess;
108 struct ipv6radix *branch;
109 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
110
111 // Traffic counters.
112 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
113 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
114 uint32_t eth_tx = 0;
115
116 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
117 time_t time_now = 0; // Current time in seconds since epoch.
118 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
119 static char time_now_string[64] = {0}; // Current time as a string.
120 static int time_changed = 0; // time_now changed
121 char main_quit = 0; // True if we're in the process of exiting.
122 static char main_reload = 0; // Re-load pending
123 linked_list *loaded_plugins;
124 linked_list *plugins[MAX_PLUGIN_TYPES];
125
126 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
127 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
128
129 config_descriptt config_values[] = {
130 CONFIG("debug", debug, INT),
131 CONFIG("log_file", log_filename, STRING),
132 CONFIG("pid_file", pid_file, STRING),
133 CONFIG("random_device", random_device, STRING),
134 CONFIG("l2tp_secret", l2tp_secret, STRING),
135 CONFIG("l2tp_mtu", l2tp_mtu, INT),
136 CONFIG("ppp_restart_time", ppp_restart_time, INT),
137 CONFIG("ppp_max_configure", ppp_max_configure, INT),
138 CONFIG("ppp_max_failure", ppp_max_failure, INT),
139 CONFIG("primary_dns", default_dns1, IPv4),
140 CONFIG("secondary_dns", default_dns2, IPv4),
141 CONFIG("primary_radius", radiusserver[0], IPv4),
142 CONFIG("secondary_radius", radiusserver[1], IPv4),
143 CONFIG("primary_radius_port", radiusport[0], SHORT),
144 CONFIG("secondary_radius_port", radiusport[1], SHORT),
145 CONFIG("radius_accounting", radius_accounting, BOOL),
146 CONFIG("radius_interim", radius_interim, INT),
147 CONFIG("radius_secret", radiussecret, STRING),
148 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
149 CONFIG("radius_dae_port", radius_dae_port, SHORT),
150 CONFIG("radius_bind_min", radius_bind_min, SHORT),
151 CONFIG("radius_bind_max", radius_bind_max, SHORT),
152 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
153 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
154 CONFIG("guest_account", guest_user, STRING),
155 CONFIG("bind_address", bind_address, IPv4),
156 CONFIG("peer_address", peer_address, IPv4),
157 CONFIG("send_garp", send_garp, BOOL),
158 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
159 CONFIG("throttle_buckets", num_tbfs, INT),
160 CONFIG("accounting_dir", accounting_dir, STRING),
161 CONFIG("dump_speed", dump_speed, BOOL),
162 CONFIG("multi_read_count", multi_read_count, INT),
163 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
164 CONFIG("lock_pages", lock_pages, BOOL),
165 CONFIG("icmp_rate", icmp_rate, INT),
166 CONFIG("packet_limit", max_packets, INT),
167 CONFIG("cluster_address", cluster_address, IPv4),
168 CONFIG("cluster_interface", cluster_interface, STRING),
169 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
170 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
171 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
172 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
173 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
174 CONFIG("cli_bind_address", cli_bind_address, IPv4),
175 CONFIG("hostname", hostname, STRING),
176 #ifdef BGP
177 CONFIG("nexthop_address", nexthop_address, IPv4),
178 CONFIG("nexthop6_address", nexthop6_address, IPv6),
179 #endif
180 CONFIG("echo_timeout", echo_timeout, INT),
181 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
182 CONFIG("iftun_address", iftun_address, IPv4),
183 CONFIG("tundevicename", tundevicename, STRING),
184 #ifdef LAC
185 CONFIG("disable_lac_func", disable_lac_func, BOOL),
186 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
187 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
188 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
189 #endif
190 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
191 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
192 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
193 CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
194 { NULL, 0, 0, 0 }
195 };
196
197 static char *plugin_functions[] = {
198 NULL,
199 "plugin_pre_auth",
200 "plugin_post_auth",
201 "plugin_timer",
202 "plugin_new_session",
203 "plugin_kill_session",
204 "plugin_control",
205 "plugin_radius_response",
206 "plugin_radius_reset",
207 "plugin_radius_account",
208 "plugin_become_master",
209 "plugin_new_session_master",
210 };
211
212 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
213
214 // Counters for shutdown sessions
215 static sessiont shut_acct[8192];
216 static sessionidt shut_acct_n = 0;
217
218 tunnelt *tunnel = NULL; // Array of tunnel structures.
219 bundlet *bundle = NULL; // Array of bundle structures.
220 fragmentationt *frag = NULL; // Array of fragmentation structures.
221 sessiont *session = NULL; // Array of session structures.
222 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
223 radiust *radius = NULL; // Array of radius structures.
224 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
225 ip_filtert *ip_filters = NULL; // Array of named filters.
226 static controlt *controlfree = 0;
227 struct Tstats *_statistics = NULL;
228 #ifdef RINGBUFFER
229 struct Tringbuffer *ringbuffer = NULL;
230 #endif
231
232 static ssize_t netlink_send(struct nlmsghdr *nh);
233 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
234 static void cache_ipmap(in_addr_t ip, sessionidt s);
235 static void uncache_ipmap(in_addr_t ip);
236 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
237 static void free_ip_address(sessionidt s);
238 static void dump_acct_info(int all);
239 static void sighup_handler(int sig);
240 static void shutdown_handler(int sig);
241 static void sigchild_handler(int sig);
242 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
243 static void update_config(void);
244 static void read_config_file(void);
245 static void initplugins(void);
246 static int add_plugin(char *plugin_name);
247 static int remove_plugin(char *plugin_name);
248 static void plugins_done(void);
249 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
250 static tunnelidt new_tunnel(void);
251 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
252 static void bundleclear(bundleidt b);
253
254 // return internal time (10ths since process startup), set f if given
255 // as a side-effect sets time_now, and time_changed
256 static clockt now(double *f)
257 {
258 struct timeval t;
259 gettimeofday(&t, 0);
260 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
261 if (t.tv_sec != time_now)
262 {
263 time_now = t.tv_sec;
264 time_changed++;
265 }
266
267 // Time in milliseconds
268 // TODO FOR MLPPP DEV
269 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
270
271 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
272 }
273
274 // work out a retry time based on try number
275 // This is a straight bounded exponential backoff.
276 // Maximum re-try time is 32 seconds. (2^5).
277 clockt backoff(uint8_t try)
278 {
279 if (try > 5) try = 5; // max backoff
280 return now(NULL) + 10 * (1 << try);
281 }
282
283
284 //
285 // Log a debug message. Typically called via the LOG macro
286 //
287 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
288 {
289 static char message[65536] = {0};
290 va_list ap;
291
292 #ifdef RINGBUFFER
293 if (ringbuffer)
294 {
295 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
296 ringbuffer->tail = 0;
297 if (ringbuffer->tail == ringbuffer->head)
298 if (++ringbuffer->head >= RINGBUFFER_SIZE)
299 ringbuffer->head = 0;
300
301 ringbuffer->buffer[ringbuffer->tail].level = level;
302 ringbuffer->buffer[ringbuffer->tail].session = s;
303 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
304 va_start(ap, format);
305 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
306 va_end(ap);
307 }
308 #endif
309
310 if (config->debug < level) return;
311
312 va_start(ap, format);
313 vsnprintf(message, sizeof(message), format, ap);
314
315 if (log_stream)
316 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
317 else if (syslog_log)
318 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
319
320 va_end(ap);
321 }
322
323 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
324 {
325 int i, j;
326 const uint8_t *d = data;
327
328 if (config->debug < level) return;
329
330 // No support for _log_hex to syslog
331 if (log_stream)
332 {
333 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
334 setvbuf(log_stream, NULL, _IOFBF, 16384);
335
336 for (i = 0; i < maxsize; )
337 {
338 fprintf(log_stream, "%4X: ", i);
339 for (j = i; j < maxsize && j < (i + 16); j++)
340 {
341 fprintf(log_stream, "%02X ", d[j]);
342 if (j == i + 7)
343 fputs(": ", log_stream);
344 }
345
346 for (; j < i + 16; j++)
347 {
348 fputs(" ", log_stream);
349 if (j == i + 7)
350 fputs(": ", log_stream);
351 }
352
353 fputs(" ", log_stream);
354 for (j = i; j < maxsize && j < (i + 16); j++)
355 {
356 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
357 fputc(d[j], log_stream);
358 else
359 fputc('.', log_stream);
360
361 if (j == i + 7)
362 fputs(" ", log_stream);
363 }
364
365 i = j;
366 fputs("\n", log_stream);
367 }
368
369 fflush(log_stream);
370 setbuf(log_stream, NULL);
371 }
372 }
373
374 // update a counter, accumulating 2^32 wraps
375 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
376 {
377 uint32_t new = *counter + delta;
378 if (new < *counter)
379 (*wrap)++;
380
381 *counter = new;
382 }
383
384 // initialise the random generator
385 static void initrandom(char *source)
386 {
387 static char path[sizeof(config->random_device)] = "*undefined*";
388
389 // reinitialise only if we are forced to do so or if the config has changed
390 if (source && !strncmp(path, source, sizeof(path)))
391 return;
392
393 // close previous source, if any
394 if (rand_fd >= 0)
395 close(rand_fd);
396
397 rand_fd = -1;
398
399 if (source)
400 {
401 // register changes
402 snprintf(path, sizeof(path), "%s", source);
403
404 if (*path == '/')
405 {
406 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
407 if (rand_fd < 0)
408 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
409 path, strerror(errno));
410 }
411 }
412 }
413
414 // fill buffer with random data
415 void random_data(uint8_t *buf, int len)
416 {
417 int n = 0;
418
419 CSTAT(random_data);
420 if (rand_fd >= 0)
421 {
422 n = read(rand_fd, buf, len);
423 if (n >= len) return;
424 if (n < 0)
425 {
426 if (errno != EAGAIN)
427 {
428 LOG(0, 0, 0, "Error reading from random source: %s\n",
429 strerror(errno));
430
431 // fall back to rand()
432 initrandom(NULL);
433 }
434
435 n = 0;
436 }
437 }
438
439 // append missing data
440 while (n < len)
441 // not using the low order bits from the prng stream
442 buf[n++] = (rand() >> 4) & 0xff;
443 }
444
445 // Add a route
446 //
447 // This adds it to the routing table, advertises it
448 // via BGP if enabled, and stuffs it into the
449 // 'sessionbyip' cache.
450 //
451 // 'ip' must be in _host_ order.
452 //
453 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
454 {
455 struct {
456 struct nlmsghdr nh;
457 struct rtmsg rt;
458 char buf[32];
459 } req;
460 int i;
461 in_addr_t n_ip;
462
463 if (!prefixlen) prefixlen = 32;
464
465 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
466
467 memset(&req, 0, sizeof(req));
468
469 if (add)
470 {
471 req.nh.nlmsg_type = RTM_NEWROUTE;
472 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
473 }
474 else
475 {
476 req.nh.nlmsg_type = RTM_DELROUTE;
477 req.nh.nlmsg_flags = NLM_F_REQUEST;
478 }
479
480 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
481
482 req.rt.rtm_family = AF_INET;
483 req.rt.rtm_dst_len = prefixlen;
484 req.rt.rtm_table = RT_TABLE_MAIN;
485 req.rt.rtm_protocol = 42;
486 req.rt.rtm_scope = RT_SCOPE_LINK;
487 req.rt.rtm_type = RTN_UNICAST;
488
489 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
490 n_ip = htonl(ip);
491 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
492 if (gw)
493 {
494 n_ip = htonl(gw);
495 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
496 }
497
498 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
499 fmtaddr(htonl(ip), 0), prefixlen,
500 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
501
502 if (netlink_send(&req.nh) < 0)
503 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
504
505 #ifdef BGP
506 if (add)
507 bgp_add_route(htonl(ip), prefixlen);
508 else
509 bgp_del_route(htonl(ip), prefixlen);
510 #endif /* BGP */
511
512 // Add/Remove the IPs to the 'sessionbyip' cache.
513 // Note that we add the zero address in the case of
514 // a network route. Roll on CIDR.
515
516 // Note that 's == 0' implies this is the address pool.
517 // We still cache it here, because it will pre-fill
518 // the malloc'ed tree.
519
520 if (s)
521 {
522 if (!add) // Are we deleting a route?
523 s = 0; // Caching the session as '0' is the same as uncaching.
524
525 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
526 cache_ipmap(i, s);
527 }
528 }
529
530 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
531 {
532 struct {
533 struct nlmsghdr nh;
534 struct rtmsg rt;
535 char buf[64];
536 } req;
537 int metric;
538 char ipv6addr[INET6_ADDRSTRLEN];
539
540 if (!config->ipv6_prefix.s6_addr[0])
541 {
542 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
543 return;
544 }
545
546 memset(&req, 0, sizeof(req));
547
548 if (add)
549 {
550 req.nh.nlmsg_type = RTM_NEWROUTE;
551 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
552 }
553 else
554 {
555 req.nh.nlmsg_type = RTM_DELROUTE;
556 req.nh.nlmsg_flags = NLM_F_REQUEST;
557 }
558
559 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
560
561 req.rt.rtm_family = AF_INET6;
562 req.rt.rtm_dst_len = prefixlen;
563 req.rt.rtm_table = RT_TABLE_MAIN;
564 req.rt.rtm_protocol = 42;
565 req.rt.rtm_scope = RT_SCOPE_LINK;
566 req.rt.rtm_type = RTN_UNICAST;
567
568 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
569 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
570 metric = 1;
571 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
572
573 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
574 add ? "add" : "del",
575 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
576 prefixlen);
577
578 if (netlink_send(&req.nh) < 0)
579 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
580
581 #ifdef BGP
582 if (add)
583 bgp_add_route6(ip, prefixlen);
584 else
585 bgp_del_route6(ip, prefixlen);
586 #endif /* BGP */
587
588 if (s)
589 {
590 if (!add) // Are we deleting a route?
591 s = 0; // Caching the session as '0' is the same as uncaching.
592
593 cache_ipv6map(ip, prefixlen, s);
594 }
595
596 return;
597 }
598
599 //
600 // Set up netlink socket
601 static void initnetlink(void)
602 {
603 struct sockaddr_nl nladdr;
604
605 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
606 if (nlfd < 0)
607 {
608 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
609 exit(1);
610 }
611
612 memset(&nladdr, 0, sizeof(nladdr));
613 nladdr.nl_family = AF_NETLINK;
614 nladdr.nl_pid = getpid();
615
616 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
617 {
618 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
619 exit(1);
620 }
621 }
622
623 static ssize_t netlink_send(struct nlmsghdr *nh)
624 {
625 struct sockaddr_nl nladdr;
626 struct iovec iov;
627 struct msghdr msg;
628
629 nh->nlmsg_pid = getpid();
630 nh->nlmsg_seq = ++nlseqnum;
631
632 // set kernel address
633 memset(&nladdr, 0, sizeof(nladdr));
634 nladdr.nl_family = AF_NETLINK;
635
636 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
637 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
638
639 return sendmsg(nlfd, &msg, 0);
640 }
641
642 static ssize_t netlink_recv(void *buf, ssize_t len)
643 {
644 struct sockaddr_nl nladdr;
645 struct iovec iov;
646 struct msghdr msg;
647
648 // set kernel address
649 memset(&nladdr, 0, sizeof(nladdr));
650 nladdr.nl_family = AF_NETLINK;
651
652 iov = (struct iovec){ buf, len };
653 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
654
655 return recvmsg(nlfd, &msg, 0);
656 }
657
658 /* adapted from iproute2 */
659 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
660 {
661 int len = RTA_LENGTH(alen);
662 struct rtattr *rta;
663
664 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
665 rta->rta_type = type;
666 rta->rta_len = len;
667 memcpy(RTA_DATA(rta), data, alen);
668 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
669 }
670
671 // messages corresponding to different phases seq number
672 static char *tun_nl_phase_msg[] = {
673 "initialized",
674 "getting tun interface index",
675 "setting tun interface parameters",
676 "setting tun IPv4 address",
677 "setting tun LL IPv6 address",
678 "setting tun global IPv6 address",
679 };
680
681 //
682 // Set up TUN interface
683 static void inittun(void)
684 {
685 struct ifreq ifr;
686
687 memset(&ifr, 0, sizeof(ifr));
688 ifr.ifr_flags = IFF_TUN;
689
690 tunfd = open(TUNDEVICE, O_RDWR);
691 if (tunfd < 0)
692 { // fatal
693 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
694 exit(1);
695 }
696 {
697 int flags = fcntl(tunfd, F_GETFL, 0);
698 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
699 }
700
701 if (*config->tundevicename)
702 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
703
704 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
705 {
706 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
707 exit(1);
708 }
709 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
710 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
711
712 tunidx = if_nametoindex(config->tundevicename);
713 if (tunidx == 0)
714 {
715 LOG(0, 0, 0, "Can't get tun interface index\n");
716 exit(1);
717 }
718
719 {
720 struct {
721 // interface setting
722 struct nlmsghdr nh;
723 union {
724 struct ifinfomsg ifinfo;
725 struct ifaddrmsg ifaddr;
726 } ifmsg;
727 char rtdata[32]; // 32 should be enough
728 } req;
729 uint32_t txqlen, mtu;
730 in_addr_t ip;
731
732 memset(&req, 0, sizeof(req));
733
734 req.nh.nlmsg_type = RTM_NEWLINK;
735 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
736 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
737
738 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
739 req.ifmsg.ifinfo.ifi_index = tunidx;
740 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
741 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
742
743 /* Bump up the qlen to deal with bursts from the network */
744 txqlen = 1000;
745 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
746 /* set MTU to modem MRU */
747 mtu = MRU;
748 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
749
750 if (netlink_send(&req.nh) < 0)
751 goto senderror;
752
753 memset(&req, 0, sizeof(req));
754
755 req.nh.nlmsg_type = RTM_NEWADDR;
756 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
757 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
758
759 req.ifmsg.ifaddr.ifa_family = AF_INET;
760 req.ifmsg.ifaddr.ifa_prefixlen = 32;
761 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
762 req.ifmsg.ifaddr.ifa_index = tunidx;
763
764 if (config->iftun_address)
765 ip = config->iftun_address;
766 else
767 ip = 0x01010101; // 1.1.1.1
768 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
769
770 if (netlink_send(&req.nh) < 0)
771 goto senderror;
772
773 // Only setup IPv6 on the tun device if we have a configured prefix
774 if (config->ipv6_prefix.s6_addr[0]) {
775 struct in6_addr ip6;
776
777 memset(&req, 0, sizeof(req));
778
779 req.nh.nlmsg_type = RTM_NEWADDR;
780 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
781 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
782
783 req.ifmsg.ifaddr.ifa_family = AF_INET6;
784 req.ifmsg.ifaddr.ifa_prefixlen = 64;
785 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
786 req.ifmsg.ifaddr.ifa_index = tunidx;
787
788 // Link local address is FE80::1
789 memset(&ip6, 0, sizeof(ip6));
790 ip6.s6_addr[0] = 0xFE;
791 ip6.s6_addr[1] = 0x80;
792 ip6.s6_addr[15] = 1;
793 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
794
795 if (netlink_send(&req.nh) < 0)
796 goto senderror;
797
798 memset(&req, 0, sizeof(req));
799
800 req.nh.nlmsg_type = RTM_NEWADDR;
801 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
802 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
803
804 req.ifmsg.ifaddr.ifa_family = AF_INET6;
805 req.ifmsg.ifaddr.ifa_prefixlen = 64;
806 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
807 req.ifmsg.ifaddr.ifa_index = tunidx;
808
809 // Global address is prefix::1
810 ip6 = config->ipv6_prefix;
811 ip6.s6_addr[15] = 1;
812 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
813
814 if (netlink_send(&req.nh) < 0)
815 goto senderror;
816 }
817
818 memset(&req, 0, sizeof(req));
819
820 req.nh.nlmsg_type = NLMSG_DONE;
821 req.nh.nlmsg_len = NLMSG_LENGTH(0);
822
823 if (netlink_send(&req.nh) < 0)
824 goto senderror;
825
826 // if we get an error for seqnum < min_initok_nlseqnum,
827 // we must exit as initialization went wrong
828 if (config->ipv6_prefix.s6_addr[0])
829 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
830 else
831 min_initok_nlseqnum = 3 + 1; // idx + if + addr
832 }
833
834 return;
835
836 senderror:
837 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
838 exit(1);
839 }
840
841 // set up UDP ports
842 static void initudp(void)
843 {
844 int on = 1;
845 struct sockaddr_in addr;
846
847 // Tunnel
848 memset(&addr, 0, sizeof(addr));
849 addr.sin_family = AF_INET;
850 addr.sin_port = htons(L2TPPORT);
851 addr.sin_addr.s_addr = config->bind_address;
852 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
853 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
854 {
855 int flags = fcntl(udpfd, F_GETFL, 0);
856 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
857 }
858 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
859 {
860 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
861 exit(1);
862 }
863
864 // Control
865 memset(&addr, 0, sizeof(addr));
866 addr.sin_family = AF_INET;
867 addr.sin_port = htons(NSCTL_PORT);
868 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
869 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
870 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
871 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
872 {
873 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
874 exit(1);
875 }
876
877 // Dynamic Authorization Extensions to RADIUS
878 memset(&addr, 0, sizeof(addr));
879 addr.sin_family = AF_INET;
880 addr.sin_port = htons(config->radius_dae_port);
881 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
882 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
883 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
884 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
885 {
886 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
887 exit(1);
888 }
889
890 #ifdef LAC
891 // Tunnel to Remote LNS
892 memset(&addr, 0, sizeof(addr));
893 addr.sin_family = AF_INET;
894 addr.sin_port = htons(config->bind_portremotelns);
895 addr.sin_addr.s_addr = config->bind_address_remotelns;
896 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
897 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
898 {
899 int flags = fcntl(udplacfd, F_GETFL, 0);
900 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
901 }
902 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
903 {
904 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
905 exit(1);
906 }
907 #endif
908
909 // Intercept
910 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
911 }
912
913 //
914 // Find session by IP, < 1 for not found
915 //
916 // Confusingly enough, this 'ip' must be
917 // in _network_ order. This being the common
918 // case when looking it up from IP packet headers.
919 //
920 // We actually use this cache for two things.
921 // #1. For used IP addresses, this maps to the
922 // session ID that it's used by.
923 // #2. For un-used IP addresses, this maps to the
924 // index into the pool table that contains that
925 // IP address.
926 //
927
928 static sessionidt lookup_ipmap(in_addr_t ip)
929 {
930 uint8_t *a = (uint8_t *) &ip;
931 union iphash *h = ip_hash;
932
933 if (!(h = h[*a++].idx)) return 0;
934 if (!(h = h[*a++].idx)) return 0;
935 if (!(h = h[*a++].idx)) return 0;
936
937 return h[*a].sess;
938 }
939
940 static sessionidt lookup_ipv6map(struct in6_addr ip)
941 {
942 struct ipv6radix *curnode;
943 int i;
944 int s;
945 char ipv6addr[INET6_ADDRSTRLEN];
946
947 curnode = &ipv6_hash[ip.s6_addr[0]];
948 i = 1;
949 s = curnode->sess;
950
951 while (s == 0 && i < 15 && curnode->branch != NULL)
952 {
953 curnode = &curnode->branch[ip.s6_addr[i]];
954 s = curnode->sess;
955 i++;
956 }
957
958 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
959 inet_ntop(AF_INET6, &ip, ipv6addr,
960 INET6_ADDRSTRLEN),
961 s);
962
963 return s;
964 }
965
966 sessionidt sessionbyip(in_addr_t ip)
967 {
968 sessionidt s = lookup_ipmap(ip);
969 CSTAT(sessionbyip);
970
971 if (s > 0 && s < MAXSESSION && session[s].opened)
972 return s;
973
974 return 0;
975 }
976
977 sessionidt sessionbyipv6(struct in6_addr ip)
978 {
979 sessionidt s;
980 CSTAT(sessionbyipv6);
981
982 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
983 (ip.s6_addr[0] == 0xFE &&
984 ip.s6_addr[1] == 0x80 &&
985 ip.s6_addr16[1] == 0 &&
986 ip.s6_addr16[2] == 0 &&
987 ip.s6_addr16[3] == 0)) {
988 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
989 } else {
990 s = lookup_ipv6map(ip);
991 }
992
993 if (s > 0 && s < MAXSESSION && session[s].opened)
994 return s;
995
996 return 0;
997 }
998
999 //
1000 // Take an IP address in HOST byte order and
1001 // add it to the sessionid by IP cache.
1002 //
1003 // (It's actually cached in network order)
1004 //
1005 static void cache_ipmap(in_addr_t ip, sessionidt s)
1006 {
1007 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1008 uint8_t *a = (uint8_t *) &nip;
1009 union iphash *h = ip_hash;
1010 int i;
1011
1012 for (i = 0; i < 3; i++)
1013 {
1014 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1015 return;
1016
1017 h = h[a[i]].idx;
1018 }
1019
1020 h[a[3]].sess = s;
1021
1022 if (s > 0)
1023 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1024
1025 else if (s == 0)
1026 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1027 // else a map to an ip pool index.
1028 }
1029
1030 static void uncache_ipmap(in_addr_t ip)
1031 {
1032 cache_ipmap(ip, 0); // Assign it to the NULL session.
1033 }
1034
1035 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1036 {
1037 int i;
1038 int bytes;
1039 struct ipv6radix *curnode;
1040 char ipv6addr[INET6_ADDRSTRLEN];
1041
1042 curnode = &ipv6_hash[ip.s6_addr[0]];
1043
1044 bytes = prefixlen >> 3;
1045 i = 1;
1046 while (i < bytes) {
1047 if (curnode->branch == NULL)
1048 {
1049 if (!(curnode->branch = calloc(256,
1050 sizeof (struct ipv6radix))))
1051 return;
1052 }
1053 curnode = &curnode->branch[ip.s6_addr[i]];
1054 i++;
1055 }
1056
1057 curnode->sess = s;
1058
1059 if (s > 0)
1060 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1061 inet_ntop(AF_INET6, &ip, ipv6addr,
1062 INET6_ADDRSTRLEN),
1063 prefixlen);
1064 else if (s == 0)
1065 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1066 inet_ntop(AF_INET6, &ip, ipv6addr,
1067 INET6_ADDRSTRLEN),
1068 prefixlen);
1069 }
1070
1071 //
1072 // CLI list to dump current ipcache.
1073 //
1074 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1075 {
1076 union iphash *d = ip_hash, *e, *f, *g;
1077 int i, j, k, l;
1078 int count = 0;
1079
1080 if (CLI_HELP_REQUESTED)
1081 return CLI_HELP_NO_ARGS;
1082
1083 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1084
1085 for (i = 0; i < 256; ++i)
1086 {
1087 if (!d[i].idx)
1088 continue;
1089
1090 e = d[i].idx;
1091 for (j = 0; j < 256; ++j)
1092 {
1093 if (!e[j].idx)
1094 continue;
1095
1096 f = e[j].idx;
1097 for (k = 0; k < 256; ++k)
1098 {
1099 if (!f[k].idx)
1100 continue;
1101
1102 g = f[k].idx;
1103 for (l = 0; l < 256; ++l)
1104 {
1105 if (!g[l].sess)
1106 continue;
1107
1108 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1109 ++count;
1110 }
1111 }
1112 }
1113 }
1114 cli_print(cli, "%d entries in cache", count);
1115 return CLI_OK;
1116 }
1117
1118
1119 // Find session by username, 0 for not found
1120 // walled garden users aren't authenticated, so the username is
1121 // reasonably useless. Ignore them to avoid incorrect actions
1122 //
1123 // This is VERY inefficent. Don't call it often. :)
1124 //
1125 sessionidt sessionbyuser(char *username)
1126 {
1127 int s;
1128 CSTAT(sessionbyuser);
1129
1130 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1131 {
1132 if (!session[s].opened)
1133 continue;
1134
1135 if (session[s].walled_garden)
1136 continue; // Skip walled garden users.
1137
1138 if (!strncmp(session[s].user, username, 128))
1139 return s;
1140
1141 }
1142 return 0; // Not found.
1143 }
1144
1145 void send_garp(in_addr_t ip)
1146 {
1147 int s;
1148 struct ifreq ifr;
1149 uint8_t mac[6];
1150
1151 s = socket(PF_INET, SOCK_DGRAM, 0);
1152 if (s < 0)
1153 {
1154 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1155 return;
1156 }
1157 memset(&ifr, 0, sizeof(ifr));
1158 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1159 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1160 {
1161 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1162 close(s);
1163 return;
1164 }
1165 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1166 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1167 {
1168 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1169 close(s);
1170 return;
1171 }
1172 close(s);
1173 sendarp(ifr.ifr_ifindex, mac, ip);
1174 }
1175
1176 static sessiont *sessiontbysessionidt(sessionidt s)
1177 {
1178 if (!s || s >= MAXSESSION) return NULL;
1179 return &session[s];
1180 }
1181
1182 static sessionidt sessionidtbysessiont(sessiont *s)
1183 {
1184 sessionidt val = s-session;
1185 if (s < session || val >= MAXSESSION) return 0;
1186 return val;
1187 }
1188
1189 // actually send a control message for a specific tunnel
1190 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1191 {
1192 struct sockaddr_in addr;
1193
1194 CSTAT(tunnelsend);
1195
1196 if (!t)
1197 {
1198 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1199 STAT(tunnel_tx_errors);
1200 return;
1201 }
1202
1203 if (t == TUNNEL_ID_PPPOE)
1204 {
1205 pppoe_sess_send(buf, l, t);
1206 return;
1207 }
1208
1209 if (!tunnel[t].ip)
1210 {
1211 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1212 STAT(tunnel_tx_errors);
1213 return;
1214 }
1215
1216 memset(&addr, 0, sizeof(addr));
1217 addr.sin_family = AF_INET;
1218 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1219 addr.sin_port = htons(tunnel[t].port);
1220
1221 // sequence expected, if sequence in message
1222 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1223
1224 // If this is a control message, deal with retries
1225 if (*buf & 0x80)
1226 {
1227 tunnel[t].last = time_now; // control message sent
1228 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1229 if (tunnel[t].try)
1230 {
1231 STAT(tunnel_retries);
1232 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1233 }
1234 }
1235 #ifdef LAC
1236 if (sendto((tunnel[t].isremotelns?udplacfd:udpfd), buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1237 #else
1238 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1239 #endif
1240 {
1241 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1242 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1243 STAT(tunnel_tx_errors);
1244 return;
1245 }
1246
1247 LOG_HEX(5, "Send Tunnel Data", buf, l);
1248 STAT(tunnel_tx_packets);
1249 INC_STAT(tunnel_tx_bytes, l);
1250 }
1251
1252 //
1253 // Tiny helper function to write data to
1254 // the 'tun' device.
1255 //
1256 int tun_write(uint8_t * data, int size)
1257 {
1258 return write(tunfd, data, size);
1259 }
1260
1261 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1262 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1263 {
1264 int d = (tcp[12] >> 4) * 4;
1265 uint8_t *mss = 0;
1266 uint8_t *opts;
1267 uint8_t *data;
1268 uint16_t orig;
1269 uint32_t sum;
1270
1271 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1272 return;
1273
1274 if (tcp + d > buf + len) // short?
1275 return;
1276
1277 opts = tcp + 20;
1278 data = tcp + d;
1279
1280 while (opts < data)
1281 {
1282 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1283 {
1284 mss = opts + 2;
1285 if (mss + 2 > data) return; // short?
1286 break;
1287 }
1288
1289 if (*opts == 0) return; // end of options
1290 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1291 opts++;
1292 else
1293 opts += opts[1]; // skip over option
1294 }
1295
1296 if (!mss) return; // not found
1297 orig = ntohs(*(uint16_t *) mss);
1298
1299 if (orig <= MSS) return; // mss OK
1300
1301 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1302 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1303 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1304 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1305
1306 // set mss
1307 *(int16_t *) mss = htons(MSS);
1308
1309 // adjust checksum (see rfc1141)
1310 sum = orig + (~MSS & 0xffff);
1311 sum += ntohs(*(uint16_t *) (tcp + 16));
1312 sum = (sum & 0xffff) + (sum >> 16);
1313 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1314 }
1315
1316 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1317 {
1318 uint16_t proto;
1319 if (extra) {
1320 // Skip the four extra bytes
1321 p += 4;
1322 l -= 4;
1323 }
1324
1325 if (*p & 1)
1326 {
1327 proto = *p++;
1328 l--;
1329 }
1330 else
1331 {
1332 proto = ntohs(*(uint16_t *) p);
1333 p += 2;
1334 l -= 2;
1335 }
1336 if (proto == PPPIP)
1337 {
1338 if (session[s].die)
1339 {
1340 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1341 return; // closing session, PPP not processed
1342 }
1343 session[s].last_packet = session[s].last_data = time_now;
1344 processipin(s, t, p, l);
1345 }
1346 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1347 {
1348 if (session[s].die)
1349 {
1350 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1351 return; // closing session, PPP not processed
1352 }
1353
1354 session[s].last_packet = session[s].last_data = time_now;
1355 processipv6in(s, t, p, l);
1356 }
1357 else if (proto == PPPIPCP)
1358 {
1359 session[s].last_packet = session[s].last_data = time_now;
1360 processipcp(s, t, p, l);
1361 }
1362 else if (proto == PPPCCP)
1363 {
1364 session[s].last_packet = session[s].last_data = time_now;
1365 processccp(s, t, p, l);
1366 }
1367 else
1368 {
1369 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1370 }
1371 }
1372
1373 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1374 {
1375 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1376 sp->cout_delta += len;
1377 sp->pout++;
1378 sp->last_data = time_now;
1379
1380 sess_local[s].cout += len; // To send to master..
1381 sess_local[s].pout++;
1382 }
1383
1384 // process outgoing (to tunnel) IP
1385 //
1386 // (i.e. this routine writes to data[-8]).
1387 void processipout(uint8_t *buf, int len)
1388 {
1389 sessionidt s;
1390 sessiont *sp;
1391 tunnelidt t;
1392 in_addr_t ip;
1393
1394 uint8_t *data = buf; // Keep a copy of the originals.
1395 int size = len;
1396
1397 uint8_t fragbuf[MAXETHER + 20];
1398
1399 CSTAT(processipout);
1400
1401 if (len < MIN_IP_SIZE)
1402 {
1403 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1404 STAT(tun_rx_errors);
1405 return;
1406 }
1407 if (len >= MAXETHER)
1408 {
1409 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1410 STAT(tun_rx_errors);
1411 return;
1412 }
1413
1414 // Skip the tun header
1415 buf += 4;
1416 len -= 4;
1417
1418 // Got an IP header now
1419 if (*(uint8_t *)(buf) >> 4 != 4)
1420 {
1421 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1422 return;
1423 }
1424
1425 ip = *(uint32_t *)(buf + 16);
1426 if (!(s = sessionbyip(ip)))
1427 {
1428 // Is this a packet for a session that doesn't exist?
1429 static int rate = 0; // Number of ICMP packets we've sent this second.
1430 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1431
1432 if (last != time_now)
1433 {
1434 last = time_now;
1435 rate = 0;
1436 }
1437
1438 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1439 {
1440 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1441 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1442 config->bind_address ? config->bind_address : my_address, buf, len);
1443 }
1444 return;
1445 }
1446
1447 t = session[s].tunnel;
1448 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1449 {
1450 LOG(3, s, t, "Packet size more than session MRU\n");
1451 return;
1452 }
1453
1454 sp = &session[s];
1455
1456 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1457 if (config->max_packets > 0)
1458 {
1459 if (sess_local[s].last_packet_out == TIME)
1460 {
1461 int max = config->max_packets;
1462
1463 // All packets for throttled sessions are handled by the
1464 // master, so further limit by using the throttle rate.
1465 // A bit of a kludge, since throttle rate is in kbps,
1466 // but should still be generous given our average DSL
1467 // packet size is 200 bytes: a limit of 28kbps equates
1468 // to around 180 packets per second.
1469 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1470 max = sp->throttle_out;
1471
1472 if (++sess_local[s].packets_out > max)
1473 {
1474 sess_local[s].packets_dropped++;
1475 return;
1476 }
1477 }
1478 else
1479 {
1480 if (sess_local[s].packets_dropped)
1481 {
1482 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1483 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1484 sess_local[s].packets_dropped, sess_local[s].packets_out,
1485 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1486 sp->user);
1487 }
1488
1489 sess_local[s].last_packet_out = TIME;
1490 sess_local[s].packets_out = 1;
1491 sess_local[s].packets_dropped = 0;
1492 }
1493 }
1494
1495 // run access-list if any
1496 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1497 return;
1498
1499 // adjust MSS on SYN and SYN,ACK packets with options
1500 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1501 {
1502 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1503 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1504 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1505 }
1506
1507 if (sp->tbf_out)
1508 {
1509 // Are we throttling this session?
1510 if (config->cluster_iam_master)
1511 tbf_queue_packet(sp->tbf_out, data, size);
1512 else
1513 master_throttle_packet(sp->tbf_out, data, size);
1514 return;
1515 }
1516
1517 if (sp->walled_garden && !config->cluster_iam_master)
1518 {
1519 // We are walled-gardening this
1520 master_garden_packet(s, data, size);
1521 return;
1522 }
1523
1524 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1525 {
1526
1527 if (!config->cluster_iam_master)
1528 {
1529 // The MPPP packets must be managed by the Master.
1530 master_forward_mppp_packet(s, data, size);
1531 return;
1532 }
1533
1534 // Add on L2TP header
1535 sessionidt members[MAXBUNDLESES];
1536 bundleidt bid = session[s].bundle;
1537 bundlet *b = &bundle[bid];
1538 uint32_t num_of_links, nb_opened;
1539 int i;
1540
1541 num_of_links = b->num_of_links;
1542 nb_opened = 0;
1543 for (i = 0;i < num_of_links;i++)
1544 {
1545 s = b->members[i];
1546 if (session[s].ppp.lcp == Opened)
1547 {
1548 members[nb_opened] = s;
1549 nb_opened++;
1550 }
1551 }
1552
1553 if (nb_opened < 1)
1554 {
1555 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1556 return;
1557 }
1558
1559 num_of_links = nb_opened;
1560 b->current_ses = (b->current_ses + 1) % num_of_links;
1561 s = members[b->current_ses];
1562 t = session[s].tunnel;
1563 sp = &session[s];
1564 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1565
1566 if (num_of_links > 1)
1567 {
1568 if(len > MINFRAGLEN)
1569 {
1570 //for rotate traffic among the member links
1571 uint32_t divisor = num_of_links;
1572 if (divisor > 2)
1573 divisor = divisor/2 + (divisor & 1);
1574
1575 // Partition the packet to "num_of_links" fragments
1576 uint32_t fraglen = len / divisor;
1577 uint32_t last_fraglen = fraglen + len % divisor;
1578 uint32_t remain = len;
1579
1580 // send the first packet
1581 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1582 if (!p) return;
1583 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1584
1585 // statistics
1586 update_session_out_stat(s, sp, fraglen);
1587
1588 remain -= fraglen;
1589 while (remain > last_fraglen)
1590 {
1591 b->current_ses = (b->current_ses + 1) % num_of_links;
1592 s = members[b->current_ses];
1593 t = session[s].tunnel;
1594 sp = &session[s];
1595 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1596 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1597 if (!p) return;
1598 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1599 update_session_out_stat(s, sp, fraglen);
1600 remain -= fraglen;
1601 }
1602 // send the last fragment
1603 b->current_ses = (b->current_ses + 1) % num_of_links;
1604 s = members[b->current_ses];
1605 t = session[s].tunnel;
1606 sp = &session[s];
1607 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1608 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1609 if (!p) return;
1610 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1611 update_session_out_stat(s, sp, remain);
1612 if (remain != last_fraglen)
1613 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1614 }
1615 else
1616 {
1617 // Send it as one frame
1618 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1619 if (!p) return;
1620 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1621 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1622 update_session_out_stat(s, sp, len);
1623 }
1624 }
1625 else
1626 {
1627 // Send it as one frame (NO MPPP Frame)
1628 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1629 tunnelsend(p, len + (buf-p), t); // send it...
1630 update_session_out_stat(s, sp, len);
1631 }
1632 }
1633 else
1634 {
1635 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1636 tunnelsend(p, len + (buf-p), t); // send it...
1637 update_session_out_stat(s, sp, len);
1638 }
1639
1640 // Snooping this session, send it to intercept box
1641 if (sp->snoop_ip && sp->snoop_port)
1642 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1643
1644 udp_tx += len;
1645 }
1646
1647 // process outgoing (to tunnel) IPv6
1648 //
1649 static void processipv6out(uint8_t * buf, int len)
1650 {
1651 sessionidt s;
1652 sessiont *sp;
1653 tunnelidt t;
1654 in_addr_t ip;
1655 struct in6_addr ip6;
1656
1657 uint8_t *data = buf; // Keep a copy of the originals.
1658 int size = len;
1659
1660 uint8_t b[MAXETHER + 20];
1661
1662 CSTAT(processipv6out);
1663
1664 if (len < MIN_IP_SIZE)
1665 {
1666 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1667 STAT(tunnel_tx_errors);
1668 return;
1669 }
1670 if (len >= MAXETHER)
1671 {
1672 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1673 STAT(tunnel_tx_errors);
1674 return;
1675 }
1676
1677 // Skip the tun header
1678 buf += 4;
1679 len -= 4;
1680
1681 // Got an IP header now
1682 if (*(uint8_t *)(buf) >> 4 != 6)
1683 {
1684 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1685 return;
1686 }
1687
1688 ip6 = *(struct in6_addr *)(buf+24);
1689 s = sessionbyipv6(ip6);
1690
1691 if (s == 0)
1692 {
1693 ip = *(uint32_t *)(buf + 32);
1694 s = sessionbyip(ip);
1695 }
1696
1697 if (s == 0)
1698 {
1699 // Is this a packet for a session that doesn't exist?
1700 static int rate = 0; // Number of ICMP packets we've sent this second.
1701 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1702
1703 if (last != time_now)
1704 {
1705 last = time_now;
1706 rate = 0;
1707 }
1708
1709 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1710 {
1711 // FIXME: Should send icmp6 host unreachable
1712 }
1713 return;
1714 }
1715 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1716 {
1717 bundleidt bid = session[s].bundle;
1718 bundlet *b = &bundle[bid];
1719
1720 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1721 s = b->members[b->current_ses];
1722 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1723 }
1724 t = session[s].tunnel;
1725 sp = &session[s];
1726 sp->last_data = time_now;
1727
1728 // FIXME: add DoS prevention/filters?
1729
1730 if (sp->tbf_out)
1731 {
1732 // Are we throttling this session?
1733 if (config->cluster_iam_master)
1734 tbf_queue_packet(sp->tbf_out, data, size);
1735 else
1736 master_throttle_packet(sp->tbf_out, data, size);
1737 return;
1738 }
1739 else if (sp->walled_garden && !config->cluster_iam_master)
1740 {
1741 // We are walled-gardening this
1742 master_garden_packet(s, data, size);
1743 return;
1744 }
1745
1746 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1747
1748 // Add on L2TP header
1749 {
1750 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1751 if (!p) return;
1752 tunnelsend(b, len + (p-b), t); // send it...
1753 }
1754
1755 // Snooping this session, send it to intercept box
1756 if (sp->snoop_ip && sp->snoop_port)
1757 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1758
1759 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1760 sp->cout_delta += len;
1761 sp->pout++;
1762 udp_tx += len;
1763
1764 sess_local[s].cout += len; // To send to master..
1765 sess_local[s].pout++;
1766 }
1767
1768 //
1769 // Helper routine for the TBF filters.
1770 // Used to send queued data in to the user!
1771 //
1772 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1773 {
1774 sessiont *sp;
1775 tunnelidt t;
1776
1777 uint8_t b[MAXETHER + 20];
1778
1779 if (len < 0 || len > MAXETHER)
1780 {
1781 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1782 return;
1783 }
1784
1785 // Skip the tun header
1786 buf += 4;
1787 len -= 4;
1788
1789 if (!session[s].ip)
1790 return;
1791
1792 t = session[s].tunnel;
1793 sp = &session[s];
1794
1795 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1796
1797 // Add on L2TP header
1798 {
1799 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1800 if (!p) return;
1801 tunnelsend(b, len + (p-b), t); // send it...
1802 }
1803
1804 // Snooping this session.
1805 if (sp->snoop_ip && sp->snoop_port)
1806 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1807
1808 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1809 sp->cout_delta += len;
1810 sp->pout++;
1811 udp_tx += len;
1812
1813 sess_local[s].cout += len; // To send to master..
1814 sess_local[s].pout++;
1815 }
1816
1817 // add an AVP (16 bit)
1818 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1819 {
1820 uint16_t l = (m ? 0x8008 : 0x0008);
1821 c->buf16[c->length/2 + 0] = htons(l);
1822 c->buf16[c->length/2 + 1] = htons(0);
1823 c->buf16[c->length/2 + 2] = htons(avp);
1824 c->buf16[c->length/2 + 3] = htons(val);
1825 c->length += 8;
1826 }
1827
1828 // add an AVP (32 bit)
1829 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1830 {
1831 uint16_t l = (m ? 0x800A : 0x000A);
1832 c->buf16[c->length/2 + 0] = htons(l);
1833 c->buf16[c->length/2 + 1] = htons(0);
1834 c->buf16[c->length/2 + 2] = htons(avp);
1835 *(uint32_t *) &c->buf[c->length + 6] = htonl(val);
1836 c->length += 10;
1837 }
1838
1839 // add an AVP (string)
1840 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1841 {
1842 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1843 c->buf16[c->length/2 + 0] = htons(l);
1844 c->buf16[c->length/2 + 1] = htons(0);
1845 c->buf16[c->length/2 + 2] = htons(avp);
1846 memcpy(&c->buf[c->length + 6], val, strlen(val));
1847 c->length += 6 + strlen(val);
1848 }
1849
1850 // add a binary AVP
1851 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1852 {
1853 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1854 c->buf16[c->length/2 + 0] = htons(l);
1855 c->buf16[c->length/2 + 1] = htons(0);
1856 c->buf16[c->length/2 + 2] = htons(avp);
1857 memcpy(&c->buf[c->length + 6], val, len);
1858 c->length += 6 + len;
1859 }
1860
1861 // new control connection
1862 static controlt *controlnew(uint16_t mtype)
1863 {
1864 controlt *c;
1865 if (!controlfree)
1866 c = malloc(sizeof(controlt));
1867 else
1868 {
1869 c = controlfree;
1870 controlfree = c->next;
1871 }
1872 assert(c);
1873 c->next = 0;
1874 c->buf16[0] = htons(0xC802); // flags/ver
1875 c->length = 12;
1876 control16(c, 0, mtype, 1);
1877 return c;
1878 }
1879
1880 // send zero block if nothing is waiting
1881 // (ZLB send).
1882 static void controlnull(tunnelidt t)
1883 {
1884 uint16_t buf[6];
1885 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1886 return;
1887
1888 buf[0] = htons(0xC802); // flags/ver
1889 buf[1] = htons(12); // length
1890 buf[2] = htons(tunnel[t].far); // tunnel
1891 buf[3] = htons(0); // session
1892 buf[4] = htons(tunnel[t].ns); // sequence
1893 buf[5] = htons(tunnel[t].nr); // sequence
1894 tunnelsend((uint8_t *)buf, 12, t);
1895 }
1896
1897 // add a control message to a tunnel, and send if within window
1898 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1899 {
1900 c->buf16[1] = htons(c->length); // length
1901 c->buf16[2] = htons(tunnel[t].far); // tunnel
1902 c->buf16[3] = htons(far); // session
1903 c->buf16[4] = htons(tunnel[t].ns); // sequence
1904 tunnel[t].ns++; // advance sequence
1905 // link in message in to queue
1906 if (tunnel[t].controlc)
1907 tunnel[t].controle->next = c;
1908 else
1909 tunnel[t].controls = c;
1910
1911 tunnel[t].controle = c;
1912 tunnel[t].controlc++;
1913
1914 // send now if space in window
1915 if (tunnel[t].controlc <= tunnel[t].window)
1916 {
1917 tunnel[t].try = 0; // first send
1918 tunnelsend(c->buf, c->length, t);
1919 }
1920 }
1921
1922 //
1923 // Throttle or Unthrottle a session
1924 //
1925 // Throttle the data from/to through a session to no more than
1926 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1927 // user).
1928 //
1929 // If either value is -1, the current value is retained for that
1930 // direction.
1931 //
1932 void throttle_session(sessionidt s, int rate_in, int rate_out)
1933 {
1934 if (!session[s].opened)
1935 return; // No-one home.
1936
1937 if (!*session[s].user)
1938 return; // User not logged in
1939
1940 if (rate_in >= 0)
1941 {
1942 int bytes = rate_in * 1024 / 8; // kbits to bytes
1943 if (session[s].tbf_in)
1944 free_tbf(session[s].tbf_in);
1945
1946 if (rate_in > 0)
1947 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1948 else
1949 session[s].tbf_in = 0;
1950
1951 session[s].throttle_in = rate_in;
1952 }
1953
1954 if (rate_out >= 0)
1955 {
1956 int bytes = rate_out * 1024 / 8;
1957 if (session[s].tbf_out)
1958 free_tbf(session[s].tbf_out);
1959
1960 if (rate_out > 0)
1961 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1962 else
1963 session[s].tbf_out = 0;
1964
1965 session[s].throttle_out = rate_out;
1966 }
1967 }
1968
1969 // add/remove filters from session (-1 = no change)
1970 void filter_session(sessionidt s, int filter_in, int filter_out)
1971 {
1972 if (!session[s].opened)
1973 return; // No-one home.
1974
1975 if (!*session[s].user)
1976 return; // User not logged in
1977
1978 // paranoia
1979 if (filter_in > MAXFILTER) filter_in = -1;
1980 if (filter_out > MAXFILTER) filter_out = -1;
1981 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1982 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1983
1984 if (filter_in >= 0)
1985 {
1986 if (session[s].filter_in)
1987 ip_filters[session[s].filter_in - 1].used--;
1988
1989 if (filter_in > 0)
1990 ip_filters[filter_in - 1].used++;
1991
1992 session[s].filter_in = filter_in;
1993 }
1994
1995 if (filter_out >= 0)
1996 {
1997 if (session[s].filter_out)
1998 ip_filters[session[s].filter_out - 1].used--;
1999
2000 if (filter_out > 0)
2001 ip_filters[filter_out - 1].used++;
2002
2003 session[s].filter_out = filter_out;
2004 }
2005 }
2006
2007 // start tidy shutdown of session
2008 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2009 {
2010 int walled_garden = session[s].walled_garden;
2011 bundleidt b = session[s].bundle;
2012 //delete routes only for last session in bundle (in case of MPPP)
2013 int del_routes = !b || (bundle[b].num_of_links == 1);
2014
2015 CSTAT(sessionshutdown);
2016
2017 if (!session[s].opened)
2018 {
2019 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2020 return; // not a live session
2021 }
2022
2023 if (!session[s].die)
2024 {
2025 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2026 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2027 run_plugins(PLUGIN_KILL_SESSION, &data);
2028 }
2029
2030 if (session[s].ip && !walled_garden && !session[s].die)
2031 {
2032 // RADIUS Stop message
2033 uint16_t r = radiusnew(s);
2034 if (r)
2035 {
2036 // stop, if not already trying
2037 if (radius[r].state != RADIUSSTOP)
2038 {
2039 radius[r].term_cause = term_cause;
2040 radius[r].term_msg = reason;
2041 radiussend(r, RADIUSSTOP);
2042 }
2043 }
2044 else
2045 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2046
2047 // Save counters to dump to accounting file
2048 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2049 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2050 }
2051
2052 if (!session[s].die)
2053 session[s].die = TIME + 150; // Clean up in 15 seconds
2054
2055 if (session[s].ip)
2056 { // IP allocated, clear and unroute
2057 int r;
2058 int routed = 0;
2059 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2060 {
2061 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2062 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2063 routed++;
2064
2065 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2066 session[s].route[r].ip = 0;
2067 }
2068
2069 if (session[s].ip_pool_index == -1) // static ip
2070 {
2071 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2072 session[s].ip = 0;
2073 }
2074 else
2075 free_ip_address(s);
2076
2077 // unroute IPv6, if setup
2078 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2079 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2080
2081 if (b)
2082 {
2083 // This session was part of a bundle
2084 bundle[b].num_of_links--;
2085 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2086 if(bundle[b].num_of_links == 0)
2087 {
2088 bundleclear(b);
2089 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2090 }
2091 else
2092 {
2093 // Adjust the members array to accomodate the new change
2094 uint8_t mem_num = 0;
2095 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2096 if(bundle[b].members[bundle[b].num_of_links] != s)
2097 {
2098 uint8_t ml;
2099 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2100 if(bundle[b].members[ml] == s)
2101 {
2102 mem_num = ml;
2103 break;
2104 }
2105 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2106 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2107
2108 // If the killed session is the first of the bundle,
2109 // the new first session must be stored in the cache_ipmap
2110 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2111 if (mem_num == 0)
2112 {
2113 sessionidt new_s = bundle[b].members[0];
2114
2115 routed = 0;
2116 // Add the route for this session.
2117 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2118 {
2119 int i, prefixlen;
2120 in_addr_t ip;
2121
2122 prefixlen = session[new_s].route[r].prefixlen;
2123 ip = session[new_s].route[r].ip;
2124
2125 if (!prefixlen) prefixlen = 32;
2126 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2127
2128 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2129 cache_ipmap(i, new_s);
2130 }
2131 cache_ipmap(session[new_s].ip, new_s);
2132
2133 // IPV6 route
2134 if (session[new_s].ipv6prefixlen)
2135 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2136 }
2137 }
2138 }
2139
2140 cluster_send_bundle(b);
2141 }
2142 }
2143
2144 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2145 throttle_session(s, 0, 0);
2146
2147 if (cdn_result)
2148 {
2149 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2150 {
2151 pppoe_shutdown_session(s);
2152 }
2153 else
2154 {
2155 // Send CDN
2156 controlt *c = controlnew(14); // sending CDN
2157 if (cdn_error)
2158 {
2159 uint16_t buf[2];
2160 buf[0] = htons(cdn_result);
2161 buf[1] = htons(cdn_error);
2162 controlb(c, 1, (uint8_t *)buf, 4, 1);
2163 }
2164 else
2165 control16(c, 1, cdn_result, 1);
2166
2167 control16(c, 14, s, 1); // assigned session (our end)
2168 controladd(c, session[s].far, session[s].tunnel); // send the message
2169 }
2170 }
2171
2172 // update filter refcounts
2173 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2174 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2175
2176 // clear PPP state
2177 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2178 sess_local[s].lcp.restart = 0;
2179 sess_local[s].ipcp.restart = 0;
2180 sess_local[s].ipv6cp.restart = 0;
2181 sess_local[s].ccp.restart = 0;
2182
2183 cluster_send_session(s);
2184 }
2185
2186 void sendipcp(sessionidt s, tunnelidt t)
2187 {
2188 uint8_t buf[MAXETHER];
2189 uint8_t *q;
2190
2191 CSTAT(sendipcp);
2192 LOG(3, s, t, "IPCP: send ConfigReq\n");
2193
2194 if (!session[s].unique_id)
2195 {
2196 if (!++last_id) ++last_id; // skip zero
2197 session[s].unique_id = last_id;
2198 }
2199
2200 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2201 if (!q) return;
2202
2203 *q = ConfigReq;
2204 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2205 *(uint16_t *) (q + 2) = htons(10); // packet length
2206 q[4] = 3; // ip address option
2207 q[5] = 6; // option length
2208 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2209 config->iftun_address ? config->iftun_address :
2210 my_address; // send my IP
2211
2212 tunnelsend(buf, 10 + (q - buf), t); // send it
2213 restart_timer(s, ipcp);
2214 }
2215
2216 void sendipv6cp(sessionidt s, tunnelidt t)
2217 {
2218 uint8_t buf[MAXETHER];
2219 uint8_t *q;
2220
2221 CSTAT(sendipv6cp);
2222 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2223
2224 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2225 if (!q) return;
2226
2227 *q = ConfigReq;
2228 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2229 // only send one type
2230 // of request
2231 *(uint16_t *) (q + 2) = htons(14);
2232 q[4] = 1; // interface identifier option
2233 q[5] = 10; // option length
2234 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2235 *(uint32_t *) (q + 10) = 0;
2236 q[13] = 1;
2237
2238 tunnelsend(buf, 14 + (q - buf), t); // send it
2239 restart_timer(s, ipv6cp);
2240 }
2241
2242 static void sessionclear(sessionidt s)
2243 {
2244 memset(&session[s], 0, sizeof(session[s]));
2245 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2246 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2247
2248 session[s].tunnel = T_FREE; // Mark it as free.
2249 session[s].next = sessionfree;
2250 sessionfree = s;
2251 }
2252
2253 // kill a session now
2254 void sessionkill(sessionidt s, char *reason)
2255 {
2256 CSTAT(sessionkill);
2257
2258 if (!session[s].opened) // not alive
2259 return;
2260
2261 if (session[s].next)
2262 {
2263 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2264 return;
2265 }
2266
2267 if (!session[s].die)
2268 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2269
2270 if (sess_local[s].radius)
2271 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2272
2273 #ifdef LAC
2274 if (session[s].forwardtosession)
2275 {
2276 sessionidt sess = session[s].forwardtosession;
2277 if (session[sess].forwardtosession == s)
2278 {
2279 // Shutdown the linked session also.
2280 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2281 }
2282 }
2283 #endif
2284
2285 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2286 sessionclear(s);
2287 cluster_send_session(s);
2288 }
2289
2290 static void tunnelclear(tunnelidt t)
2291 {
2292 if (!t) return;
2293 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2294 tunnel[t].state = TUNNELFREE;
2295 }
2296
2297 static void bundleclear(bundleidt b)
2298 {
2299 if (!b) return;
2300 memset(&bundle[b], 0, sizeof(bundle[b]));
2301 bundle[b].state = BUNDLEFREE;
2302 }
2303
2304 // kill a tunnel now
2305 static void tunnelkill(tunnelidt t, char *reason)
2306 {
2307 sessionidt s;
2308 controlt *c;
2309
2310 CSTAT(tunnelkill);
2311
2312 tunnel[t].state = TUNNELDIE;
2313
2314 // free control messages
2315 while ((c = tunnel[t].controls))
2316 {
2317 controlt * n = c->next;
2318 tunnel[t].controls = n;
2319 tunnel[t].controlc--;
2320 c->next = controlfree;
2321 controlfree = c;
2322 }
2323 // kill sessions
2324 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2325 if (session[s].tunnel == t)
2326 sessionkill(s, reason);
2327
2328 // free tunnel
2329 tunnelclear(t);
2330 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2331 cli_tunnel_actions[t].action = 0;
2332 cluster_send_tunnel(t);
2333 }
2334
2335 // shut down a tunnel cleanly
2336 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2337 {
2338 sessionidt s;
2339
2340 CSTAT(tunnelshutdown);
2341
2342 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2343 {
2344 // never set up, can immediately kill
2345 tunnelkill(t, reason);
2346 return;
2347 }
2348 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2349
2350 // close session
2351 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2352 if (session[s].tunnel == t)
2353 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2354
2355 tunnel[t].state = TUNNELDIE;
2356 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2357 cluster_send_tunnel(t);
2358 // TBA - should we wait for sessions to stop?
2359 if (result)
2360 {
2361 controlt *c = controlnew(4); // sending StopCCN
2362 if (error)
2363 {
2364 uint16_t buf[32];
2365 int l = 4;
2366 buf[0] = htons(result);
2367 buf[1] = htons(error);
2368 if (msg)
2369 {
2370 int m = strlen(msg);
2371 if (m + 4 > sizeof(buf))
2372 m = sizeof(buf) - 4;
2373
2374 memcpy(buf+2, msg, m);
2375 l += m;
2376 }
2377
2378 controlb(c, 1, (uint8_t *)buf, l, 1);
2379 }
2380 else
2381 control16(c, 1, result, 1);
2382
2383 control16(c, 9, t, 1); // assigned tunnel (our end)
2384 controladd(c, 0, t); // send the message
2385 }
2386 }
2387
2388 // read and process packet on tunnel (UDP)
2389 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2390 {
2391 uint8_t *chapresponse = NULL;
2392 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2393 uint8_t *p = buf + 2;
2394
2395
2396 CSTAT(processudp);
2397
2398 udp_rx += len;
2399 udp_rx_pkt++;
2400 LOG_HEX(5, "UDP Data", buf, len);
2401 STAT(tunnel_rx_packets);
2402 INC_STAT(tunnel_rx_bytes, len);
2403 if (len < 6)
2404 {
2405 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2406 STAT(tunnel_rx_errors);
2407 return;
2408 }
2409 if ((buf[1] & 0x0F) != 2)
2410 {
2411 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2412 STAT(tunnel_rx_errors);
2413 return;
2414 }
2415 if (*buf & 0x40)
2416 { // length
2417 l = ntohs(*(uint16_t *) p);
2418 p += 2;
2419 }
2420 t = ntohs(*(uint16_t *) p);
2421 p += 2;
2422 s = ntohs(*(uint16_t *) p);
2423 p += 2;
2424 if (s >= MAXSESSION)
2425 {
2426 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2427 STAT(tunnel_rx_errors);
2428 return;
2429 }
2430 if (t >= MAXTUNNEL)
2431 {
2432 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2433 STAT(tunnel_rx_errors);
2434 return;
2435 }
2436 if (t == TUNNEL_ID_PPPOE)
2437 {
2438 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2439 STAT(tunnel_rx_errors);
2440 return;
2441 }
2442 if (*buf & 0x08)
2443 { // ns/nr
2444 ns = ntohs(*(uint16_t *) p);
2445 p += 2;
2446 nr = ntohs(*(uint16_t *) p);
2447 p += 2;
2448 }
2449 if (*buf & 0x02)
2450 { // offset
2451 uint16_t o = ntohs(*(uint16_t *) p);
2452 p += o + 2;
2453 }
2454 if ((p - buf) > l)
2455 {
2456 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2457 STAT(tunnel_rx_errors);
2458 return;
2459 }
2460 l -= (p - buf);
2461
2462 // used to time out old tunnels
2463 if (t && tunnel[t].state == TUNNELOPEN)
2464 tunnel[t].lastrec = time_now;
2465
2466 if (*buf & 0x80)
2467 { // control
2468 uint16_t message = 0xFFFF; // message type
2469 uint8_t fatal = 0;
2470 uint8_t mandatory = 0;
2471 uint16_t asession = 0; // assigned session
2472 uint32_t amagic = 0; // magic number
2473 uint8_t aflags = 0; // flags from last LCF
2474 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2475 char called[MAXTEL] = ""; // called number
2476 char calling[MAXTEL] = ""; // calling number
2477
2478 if (!config->cluster_iam_master)
2479 {
2480 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2481 return;
2482 }
2483
2484 // control messages must have bits 0x80|0x40|0x08
2485 // (type, length and sequence) set, and bits 0x02|0x01
2486 // (offset and priority) clear
2487 if ((*buf & 0xCB) != 0xC8)
2488 {
2489 LOG(1, s, t, "Bad control header %02X\n", *buf);
2490 STAT(tunnel_rx_errors);
2491 return;
2492 }
2493
2494 // check for duplicate tunnel open message
2495 if (!t && ns == 0)
2496 {
2497 int i;
2498
2499 //
2500 // Is this a duplicate of the first packet? (SCCRQ)
2501 //
2502 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2503 {
2504 if (tunnel[i].state != TUNNELOPENING ||
2505 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2506 tunnel[i].port != ntohs(addr->sin_port) )
2507 continue;
2508 t = i;
2509 LOG(3, s, t, "Duplicate SCCRQ?\n");
2510 break;
2511 }
2512 }
2513
2514 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2515 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2516
2517 // if no tunnel specified, assign one
2518 if (!t)
2519 {
2520 if (!(t = new_tunnel()))
2521 {
2522 LOG(1, 0, 0, "No more tunnels\n");
2523 STAT(tunnel_overflow);
2524 return;
2525 }
2526 tunnelclear(t);
2527 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2528 tunnel[t].port = ntohs(addr->sin_port);
2529 tunnel[t].window = 4; // default window
2530 STAT(tunnel_created);
2531 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2532 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2533 }
2534
2535 // If the 'ns' just received is not the 'nr' we're
2536 // expecting, just send an ack and drop it.
2537 //
2538 // if 'ns' is less, then we got a retransmitted packet.
2539 // if 'ns' is greater than missed a packet. Either way
2540 // we should ignore it.
2541 if (ns != tunnel[t].nr)
2542 {
2543 // is this the sequence we were expecting?
2544 STAT(tunnel_rx_errors);
2545 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2546 t, ns, tunnel[t].nr);
2547
2548 if (l) // Is this not a ZLB?
2549 controlnull(t);
2550 return;
2551 }
2552
2553 // check sequence of this message
2554 {
2555 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2556 // some to clear maybe?
2557 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2558 {
2559 controlt *c = tunnel[t].controls;
2560 tunnel[t].controls = c->next;
2561 tunnel[t].controlc--;
2562 c->next = controlfree;
2563 controlfree = c;
2564 skip--;
2565 tunnel[t].try = 0; // we have progress
2566 }
2567
2568 // receiver advance (do here so quoted correctly in any sends below)
2569 if (l) tunnel[t].nr = (ns + 1);
2570 if (skip < 0) skip = 0;
2571 if (skip < tunnel[t].controlc)
2572 {
2573 // some control packets can now be sent that were previous stuck out of window
2574 int tosend = tunnel[t].window - skip;
2575 controlt *c = tunnel[t].controls;
2576 while (c && skip)
2577 {
2578 c = c->next;
2579 skip--;
2580 }
2581 while (c && tosend)
2582 {
2583 tunnel[t].try = 0; // first send
2584 tunnelsend(c->buf, c->length, t);
2585 c = c->next;
2586 tosend--;
2587 }
2588 }
2589 if (!tunnel[t].controlc)
2590 tunnel[t].retry = 0; // caught up
2591 }
2592 if (l)
2593 { // if not a null message
2594 int result = 0;
2595 int error = 0;
2596 char *msg = 0;
2597
2598 // Default disconnect cause/message on receipt of CDN. Set to
2599 // more specific value from attribute 1 (result code) or 46
2600 // (disconnect cause) if present below.
2601 int disc_cause_set = 0;
2602 int disc_cause = TERM_NAS_REQUEST;
2603 char const *disc_reason = "Closed (Received CDN).";
2604
2605 // process AVPs
2606 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2607 {
2608 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2609 uint8_t *b = p;
2610 uint8_t flags = *p;
2611 uint16_t mtype;
2612
2613 if (n > l)
2614 {
2615 LOG(1, s, t, "Invalid length in AVP\n");
2616 STAT(tunnel_rx_errors);
2617 return;
2618 }
2619 p += n; // next
2620 l -= n;
2621 if (flags & 0x3C) // reserved bits, should be clear
2622 {
2623 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2624 fatal = flags;
2625 result = 2; // general error
2626 error = 3; // reserved field non-zero
2627 msg = 0;
2628 continue; // next
2629 }
2630 b += 2;
2631 if (*(uint16_t *) (b))
2632 {
2633 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2634 fatal = flags;
2635 result = 2; // general error
2636 error = 6; // generic vendor-specific error
2637 msg = "unsupported vendor-specific";
2638 continue; // next
2639 }
2640 b += 2;
2641 mtype = ntohs(*(uint16_t *) (b));
2642 b += 2;
2643 n -= 6;
2644
2645 if (flags & 0x40)
2646 {
2647 uint16_t orig_len;
2648
2649 // handle hidden AVPs
2650 if (!*config->l2tp_secret)
2651 {
2652 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2653 fatal = flags;
2654 result = 2; // general error
2655 error = 6; // generic vendor-specific error
2656 msg = "secret not specified";
2657 continue;
2658 }
2659 if (!session[s].random_vector_length)
2660 {
2661 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2662 fatal = flags;
2663 result = 2; // general error
2664 error = 6; // generic
2665 msg = "no random vector";
2666 continue;
2667 }
2668 if (n < 8)
2669 {
2670 LOG(2, s, t, "Short hidden AVP.\n");
2671 fatal = flags;
2672 result = 2; // general error
2673 error = 2; // length is wrong
2674 msg = 0;
2675 continue;
2676 }
2677
2678 // Unhide the AVP
2679 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2680
2681 orig_len = ntohs(*(uint16_t *) b);
2682 if (orig_len > n + 2)
2683 {
2684 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2685 orig_len, n);
2686
2687 fatal = flags;
2688 result = 2; // general error
2689 error = 2; // length is wrong
2690 msg = 0;
2691 continue;
2692 }
2693
2694 b += 2;
2695 n = orig_len;
2696 }
2697
2698 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2699 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2700
2701 switch (mtype)
2702 {
2703 case 0: // message type
2704 message = ntohs(*(uint16_t *) b);
2705 mandatory = flags & 0x80;
2706 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2707 break;
2708 case 1: // result code
2709 {
2710 uint16_t rescode = ntohs(*(uint16_t *) b);
2711 char const *resdesc = "(unknown)";
2712 char const *errdesc = NULL;
2713 int cause = 0;
2714
2715 if (message == 4)
2716 { /* StopCCN */
2717 resdesc = l2tp_stopccn_result_code(rescode);
2718 cause = TERM_LOST_SERVICE;
2719 }
2720 else if (message == 14)
2721 { /* CDN */
2722 resdesc = l2tp_cdn_result_code(rescode);
2723 if (rescode == 1)
2724 cause = TERM_LOST_CARRIER;
2725 else
2726 cause = TERM_ADMIN_RESET;
2727 }
2728
2729 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2730 if (n >= 4)
2731 {
2732 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2733 errdesc = l2tp_error_code(errcode);
2734 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2735 }
2736 if (n > 4)
2737 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2738
2739 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2740 {
2741 disc_cause_set = mtype;
2742 disc_reason = errdesc ? errdesc : resdesc;
2743 disc_cause = cause;
2744 }
2745
2746 break;
2747 }
2748 break;
2749 case 2: // protocol version
2750 {
2751 version = ntohs(*(uint16_t *) (b));
2752 LOG(4, s, t, " Protocol version = %u\n", version);
2753 if (version && version != 0x0100)
2754 { // allow 0.0 and 1.0
2755 LOG(1, s, t, " Bad protocol version %04X\n", version);
2756 fatal = flags;
2757 result = 5; // unspported protocol version
2758 error = 0x0100; // supported version
2759 msg = 0;
2760 continue; // next
2761 }
2762 }
2763 break;
2764 case 3: // framing capabilities
2765 break;
2766 case 4: // bearer capabilities
2767 break;
2768 case 5: // tie breaker
2769 // We never open tunnels, so we don't care about tie breakers
2770 continue;
2771 case 6: // firmware revision
2772 break;
2773 case 7: // host name
2774 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2775 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2776 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2777 // TBA - to send to RADIUS
2778 break;
2779 case 8: // vendor name
2780 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2781 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2782 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2783 break;
2784 case 9: // assigned tunnel
2785 tunnel[t].far = ntohs(*(uint16_t *) (b));
2786 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2787 break;
2788 case 10: // rx window
2789 tunnel[t].window = ntohs(*(uint16_t *) (b));
2790 if (!tunnel[t].window)
2791 tunnel[t].window = 1; // window of 0 is silly
2792 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2793 break;
2794 case 11: // Challenge
2795 {
2796 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2797 build_chap_response(b, 2, n, &chapresponse);
2798 }
2799 break;
2800 case 13: // Response
2801 #ifdef LAC
2802 if (tunnel[t].isremotelns)
2803 {
2804 chapresponse = calloc(17, 1);
2805 memcpy(chapresponse, b, (n < 17) ? n : 16);
2806 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2807 }
2808 else
2809 #endif /* LAC */
2810 // Why did they send a response? We never challenge.
2811 LOG(2, s, t, " received unexpected challenge response\n");
2812 break;
2813
2814 case 14: // assigned session
2815 asession = session[s].far = ntohs(*(uint16_t *) (b));
2816 LOG(4, s, t, " assigned session = %u\n", asession);
2817 break;
2818 case 15: // call serial number
2819 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2820 break;
2821 case 18: // bearer type
2822 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2823 // TBA - for RADIUS
2824 break;
2825 case 19: // framing type
2826 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2827 // TBA
2828 break;
2829 case 21: // called number
2830 memset(called, 0, sizeof(called));
2831 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2832 LOG(4, s, t, " Called <%s>\n", called);
2833 break;
2834 case 22: // calling number
2835 memset(calling, 0, sizeof(calling));
2836 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2837 LOG(4, s, t, " Calling <%s>\n", calling);
2838 break;
2839 case 23: // subtype
2840 break;
2841 case 24: // tx connect speed
2842 if (n == 4)
2843 {
2844 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2845 }
2846 else
2847 {
2848 // AS5300s send connect speed as a string
2849 char tmp[30];
2850 memset(tmp, 0, sizeof(tmp));
2851 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2852 session[s].tx_connect_speed = atol(tmp);
2853 }
2854 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2855 break;
2856 case 38: // rx connect speed
2857 if (n == 4)
2858 {
2859 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2860 }
2861 else
2862 {
2863 // AS5300s send connect speed as a string
2864 char tmp[30];
2865 memset(tmp, 0, sizeof(tmp));
2866 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2867 session[s].rx_connect_speed = atol(tmp);
2868 }
2869 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2870 break;
2871 case 25: // Physical Channel ID
2872 {
2873 uint32_t tmp = ntohl(*(uint32_t *) b);
2874 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2875 break;
2876 }
2877 case 29: // Proxy Authentication Type
2878 {
2879 uint16_t atype = ntohs(*(uint16_t *)b);
2880 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2881 break;
2882 }
2883 case 30: // Proxy Authentication Name
2884 {
2885 char authname[64];
2886 memset(authname, 0, sizeof(authname));
2887 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2888 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2889 authname);
2890 break;
2891 }
2892 case 31: // Proxy Authentication Challenge
2893 {
2894 LOG(4, s, t, " Proxy Auth Challenge\n");
2895 break;
2896 }
2897 case 32: // Proxy Authentication ID
2898 {
2899 uint16_t authid = ntohs(*(uint16_t *)(b));
2900 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2901 break;
2902 }
2903 case 33: // Proxy Authentication Response
2904 LOG(4, s, t, " Proxy Auth Response\n");
2905 break;
2906 case 27: // last sent lcp
2907 { // find magic number
2908 uint8_t *p = b, *e = p + n;
2909 while (p + 1 < e && p[1] && p + p[1] <= e)
2910 {
2911 if (*p == 5 && p[1] == 6) // Magic-Number
2912 amagic = ntohl(*(uint32_t *) (p + 2));
2913 else if (*p == 7) // Protocol-Field-Compression
2914 aflags |= SESSION_PFC;
2915 else if (*p == 8) // Address-and-Control-Field-Compression
2916 aflags |= SESSION_ACFC;
2917 p += p[1];
2918 }
2919 }
2920 break;
2921 case 28: // last recv lcp confreq
2922 break;
2923 case 26: // Initial Received LCP CONFREQ
2924 break;
2925 case 39: // seq required - we control it as an LNS anyway...
2926 break;
2927 case 36: // Random Vector
2928 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2929 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2930 if (n > sizeof(session[s].random_vector))
2931 n = sizeof(session[s].random_vector);
2932 memcpy(session[s].random_vector, b, n);
2933 session[s].random_vector_length = n;
2934 break;
2935 case 46: // ppp disconnect cause
2936 if (n >= 5)
2937 {
2938 uint16_t code = ntohs(*(uint16_t *) b);
2939 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2940 uint8_t dir = *(b + 4);
2941
2942 LOG(4, s, t, " PPP disconnect cause "
2943 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2944 code, proto, dir, n - 5, b + 5);
2945
2946 disc_cause_set = mtype;
2947
2948 switch (code)
2949 {
2950 case 1: // admin disconnect
2951 disc_cause = TERM_ADMIN_RESET;
2952 disc_reason = "Administrative disconnect";
2953 break;
2954 case 3: // lcp terminate
2955 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2956 disc_cause = TERM_USER_REQUEST;
2957 disc_reason = "Normal disconnection";
2958 break;
2959 case 4: // compulsory encryption unavailable
2960 if (dir != 1) break; // 1=refused by peer, 2=local
2961 disc_cause = TERM_USER_ERROR;
2962 disc_reason = "Compulsory encryption refused";
2963 break;
2964 case 5: // lcp: fsm timeout
2965 disc_cause = TERM_PORT_ERROR;
2966 disc_reason = "LCP: FSM timeout";
2967 break;
2968 case 6: // lcp: no recognisable lcp packets received
2969 disc_cause = TERM_PORT_ERROR;
2970 disc_reason = "LCP: no recognisable LCP packets";
2971 break;
2972 case 7: // lcp: magic-no error (possibly looped back)
2973 disc_cause = TERM_PORT_ERROR;
2974 disc_reason = "LCP: magic-no error (possible loop)";
2975 break;
2976 case 8: // lcp: echo request timeout
2977 disc_cause = TERM_PORT_ERROR;
2978 disc_reason = "LCP: echo request timeout";
2979 break;
2980 case 13: // auth: fsm timeout
2981 disc_cause = TERM_SERVICE_UNAVAILABLE;
2982 disc_reason = "Authentication: FSM timeout";
2983 break;
2984 case 15: // auth: unacceptable auth protocol
2985 disc_cause = TERM_SERVICE_UNAVAILABLE;
2986 disc_reason = "Unacceptable authentication protocol";
2987 break;
2988 case 16: // auth: authentication failed
2989 disc_cause = TERM_SERVICE_UNAVAILABLE;
2990 disc_reason = "Authentication failed";
2991 break;
2992 case 17: // ncp: fsm timeout
2993 disc_cause = TERM_SERVICE_UNAVAILABLE;
2994 disc_reason = "NCP: FSM timeout";
2995 break;
2996 case 18: // ncp: no ncps available
2997 disc_cause = TERM_SERVICE_UNAVAILABLE;
2998 disc_reason = "NCP: no NCPs available";
2999 break;
3000 case 19: // ncp: failure to converge on acceptable address
3001 disc_cause = TERM_SERVICE_UNAVAILABLE;
3002 disc_reason = (dir == 1)
3003 ? "NCP: too many Configure-Naks received from peer"
3004 : "NCP: too many Configure-Naks sent to peer";
3005 break;
3006 case 20: // ncp: user not permitted to use any address
3007 disc_cause = TERM_SERVICE_UNAVAILABLE;
3008 disc_reason = (dir == 1)
3009 ? "NCP: local link address not acceptable to peer"
3010 : "NCP: remote link address not acceptable";
3011 break;
3012 }
3013 }
3014 break;
3015 default:
3016 {
3017 static char e[] = "unknown AVP 0xXXXX";
3018 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3019 fatal = flags;
3020 result = 2; // general error
3021 error = 8; // unknown mandatory AVP
3022 sprintf((msg = e) + 14, "%04x", mtype);
3023 continue; // next
3024 }
3025 }
3026 }
3027 // process message
3028 if (fatal & 0x80)
3029 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3030 else
3031 switch (message)
3032 {
3033 case 1: // SCCRQ - Start Control Connection Request
3034 tunnel[t].state = TUNNELOPENING;
3035 LOG(3, s, t, "Received SCCRQ\n");
3036 if (main_quit != QUIT_SHUTDOWN)
3037 {
3038 LOG(3, s, t, "sending SCCRP\n");
3039 controlt *c = controlnew(2); // sending SCCRP
3040 control16(c, 2, version, 1); // protocol version
3041 control32(c, 3, 3, 1); // framing
3042 controls(c, 7, hostname, 1); // host name
3043 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
3044 control16(c, 9, t, 1); // assigned tunnel
3045 controladd(c, 0, t); // send the resply
3046 }
3047 else
3048 {
3049 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3050 }
3051 break;
3052 case 2: // SCCRP
3053 tunnel[t].state = TUNNELOPEN;
3054 tunnel[t].lastrec = time_now;
3055 #ifdef LAC
3056 LOG(3, s, t, "Received SCCRP\n");
3057 if (main_quit != QUIT_SHUTDOWN)
3058 {
3059 if (tunnel[t].isremotelns && chapresponse)
3060 {
3061 hasht hash;
3062
3063 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3064 // check authenticator
3065 if (memcmp(hash, chapresponse, 16) == 0)
3066 {
3067 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3068 controlt *c = controlnew(3); // sending SCCCN
3069 controls(c, 7, hostname, 1); // host name
3070 controls(c, 8, Vendor_name, 1); // Vendor name
3071 control16(c, 2, version, 1); // protocol version
3072 control32(c, 3, 3, 1); // framing Capabilities
3073 control16(c, 9, t, 1); // assigned tunnel
3074 controladd(c, 0, t); // send
3075 }
3076 else
3077 {
3078 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3079 }
3080 }
3081 }
3082 else
3083 {
3084 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3085 }
3086 #endif /* LAC */
3087 break;
3088 case 3: // SCCN
3089 LOG(3, s, t, "Received SCCN\n");
3090 tunnel[t].state = TUNNELOPEN;
3091 tunnel[t].lastrec = time_now;
3092 controlnull(t); // ack
3093 break;
3094 case 4: // StopCCN
3095 LOG(3, s, t, "Received StopCCN\n");
3096 controlnull(t); // ack
3097 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3098 break;
3099 case 6: // HELLO
3100 LOG(3, s, t, "Received HELLO\n");
3101 controlnull(t); // simply ACK
3102 break;
3103 case 7: // OCRQ
3104 // TBA
3105 LOG(3, s, t, "Received OCRQ\n");
3106 break;
3107 case 8: // OCRO
3108 // TBA
3109 LOG(3, s, t, "Received OCRO\n");
3110 break;
3111 case 9: // OCCN
3112 // TBA
3113 LOG(3, s, t, "Received OCCN\n");
3114 break;
3115 case 10: // ICRQ
3116 LOG(3, s, t, "Received ICRQ\n");
3117 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3118 {
3119 controlt *c = controlnew(11); // ICRP
3120
3121 LOG(3, s, t, "Sending ICRP\n");
3122
3123 s = sessionfree;
3124 sessionfree = session[s].next;
3125 memset(&session[s], 0, sizeof(session[s]));
3126
3127 if (s > config->cluster_highest_sessionid)
3128 config->cluster_highest_sessionid = s;
3129
3130 session[s].opened = time_now;
3131 session[s].tunnel = t;
3132 session[s].far = asession;
3133 session[s].last_packet = session[s].last_data = time_now;
3134 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3135 control16(c, 14, s, 1); // assigned session
3136 controladd(c, asession, t); // send the reply
3137
3138 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3139 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3140
3141 session[s].ppp.phase = Establish;
3142 session[s].ppp.lcp = Starting;
3143
3144 STAT(session_created);
3145 break;
3146 }
3147
3148 {
3149 controlt *c = controlnew(14); // CDN
3150 LOG(3, s, t, "Sending CDN\n");
3151 if (!sessionfree)
3152 {
3153 STAT(session_overflow);
3154 LOG(1, 0, t, "No free sessions\n");
3155 control16(c, 1, 4, 0); // temporary lack of resources
3156 }
3157 else
3158 control16(c, 1, 2, 7); // shutting down, try another
3159
3160 controladd(c, asession, t); // send the message
3161 }
3162 return;
3163 case 11: // ICRP
3164 #ifdef LAC
3165 LOG(3, s, t, "Received ICRP\n");
3166 if (session[s].forwardtosession)
3167 {
3168 controlt *c = controlnew(12); // ICCN
3169
3170 session[s].opened = time_now;
3171 session[s].tunnel = t;
3172 session[s].far = asession;
3173 session[s].last_packet = session[s].last_data = time_now;
3174
3175 control32(c, 19, 1, 1); // Framing Type
3176 control32(c, 24, 10000000, 1); // Tx Connect Speed
3177 controladd(c, asession, t); // send the message
3178 LOG(3, s, t, "Sending ICCN\n");
3179 }
3180 #endif /* LAC */
3181 break;
3182 case 12: // ICCN
3183 LOG(3, s, t, "Received ICCN\n");
3184 if (amagic == 0) amagic = time_now;
3185 session[s].magic = amagic; // set magic number
3186 session[s].flags = aflags; // set flags received
3187 session[s].mru = PPPoE_MRU; // default
3188 controlnull(t); // ack
3189
3190 // start LCP
3191 sess_local[s].lcp_authtype = config->radius_authprefer;
3192 sess_local[s].ppp_mru = MRU;
3193
3194 // Set multilink options before sending initial LCP packet
3195 sess_local[s].mp_mrru = 1614;
3196 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3197
3198 sendlcp(s, t);
3199 change_state(s, lcp, RequestSent);
3200 break;
3201
3202 case 14: // CDN
3203 LOG(3, s, t, "Received CDN\n");
3204 controlnull(t); // ack
3205 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3206 break;
3207 case 0xFFFF:
3208 LOG(1, s, t, "Missing message type\n");
3209 break;
3210 default:
3211 STAT(tunnel_rx_errors);
3212 if (mandatory)
3213 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3214 else
3215 LOG(1, s, t, "Unknown message type %u\n", message);
3216 break;
3217 }
3218 if (chapresponse) free(chapresponse);
3219 cluster_send_tunnel(t);
3220 }
3221 else
3222 {
3223 LOG(4, s, t, " Got a ZLB ack\n");
3224 }
3225 }
3226 else
3227 { // data
3228 uint16_t proto;
3229
3230 LOG_HEX(5, "Receive Tunnel Data", p, l);
3231 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3232 { // HDLC address header, discard
3233 p += 2;
3234 l -= 2;
3235 }
3236 if (l < 2)
3237 {
3238 LOG(1, s, t, "Short ppp length %d\n", l);
3239 STAT(tunnel_rx_errors);
3240 return;
3241 }
3242 if (*p & 1)
3243 {
3244 proto = *p++;
3245 l--;
3246 }
3247 else
3248 {
3249 proto = ntohs(*(uint16_t *) p);
3250 p += 2;
3251 l -= 2;
3252 }
3253
3254 #ifdef LAC
3255 if (session[s].forwardtosession)
3256 {
3257 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3258 // Forward to LAC/BAS or Remote LNS session
3259 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port);
3260 return;
3261 }
3262 else if (config->auth_tunnel_change_addr_src)
3263 {
3264 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3265 tunnel[t].port == ntohs(addr->sin_port))
3266 {
3267 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3268 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3269 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3270
3271 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3272 }
3273 }
3274 #endif /* LAC */
3275
3276 if (s && !session[s].opened) // Is something wrong??
3277 {
3278 if (!config->cluster_iam_master)
3279 {
3280 // Pass it off to the master to deal with..
3281 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3282 return;
3283 }
3284
3285 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3286 STAT(tunnel_rx_errors);
3287 return;
3288 }
3289
3290 if (proto == PPPPAP)
3291 {
3292 session[s].last_packet = time_now;
3293 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3294 processpap(s, t, p, l);
3295 }
3296 else if (proto == PPPCHAP)
3297 {
3298 session[s].last_packet = time_now;
3299 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3300 processchap(s, t, p, l);
3301 }
3302 else if (proto == PPPLCP)
3303 {
3304 session[s].last_packet = time_now;
3305 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3306 processlcp(s, t, p, l);
3307 }
3308 else if (proto == PPPIPCP)
3309 {
3310 session[s].last_packet = time_now;
3311 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3312 processipcp(s, t, p, l);
3313 }
3314 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3315 {
3316 session[s].last_packet = time_now;
3317 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3318 processipv6cp(s, t, p, l);
3319 }
3320 else if (proto == PPPCCP)
3321 {
3322 session[s].last_packet = time_now;
3323 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3324 processccp(s, t, p, l);
3325 }
3326 else if (proto == PPPIP)
3327 {
3328 if (session[s].die)
3329 {
3330 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3331 return; // closing session, PPP not processed
3332 }
3333
3334 session[s].last_packet = session[s].last_data = time_now;
3335 if (session[s].walled_garden && !config->cluster_iam_master)
3336 {
3337 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3338 return;
3339 }
3340
3341 processipin(s, t, p, l);
3342 }
3343 else if (proto == PPPMP)
3344 {
3345 if (session[s].die)
3346 {
3347 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3348 return; // closing session, PPP not processed
3349 }
3350
3351 session[s].last_packet = session[s].last_data = time_now;
3352 if (!config->cluster_iam_master)
3353 {
3354 // The fragments reconstruction is managed by the Master.
3355 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3356 return;
3357 }
3358
3359 processmpin(s, t, p, l);
3360 }
3361 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3362 {
3363 if (session[s].die)
3364 {
3365 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3366 return; // closing session, PPP not processed
3367 }
3368
3369 session[s].last_packet = session[s].last_data = time_now;
3370 if (session[s].walled_garden && !config->cluster_iam_master)
3371 {
3372 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3373 return;
3374 }
3375
3376 processipv6in(s, t, p, l);
3377 }
3378 else if (session[s].ppp.lcp == Opened)
3379 {
3380 session[s].last_packet = time_now;
3381 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3382 protoreject(s, t, p, l, proto);
3383 }
3384 else
3385 {
3386 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3387 proto, ppp_state(session[s].ppp.lcp));
3388 }
3389 }
3390 }
3391
3392 // read and process packet on tun
3393 // (i.e. this routine writes to buf[-8]).
3394 static void processtun(uint8_t * buf, int len)
3395 {
3396 LOG_HEX(5, "Receive TUN Data", buf, len);
3397 STAT(tun_rx_packets);
3398 INC_STAT(tun_rx_bytes, len);
3399
3400 CSTAT(processtun);
3401
3402 eth_rx_pkt++;
3403 eth_rx += len;
3404 if (len < 22)
3405 {
3406 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3407 STAT(tun_rx_errors);
3408 return;
3409 }
3410
3411 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3412 processipout(buf, len);
3413 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3414 && config->ipv6_prefix.s6_addr[0])
3415 processipv6out(buf, len);
3416
3417 // Else discard.
3418 }
3419
3420 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3421 // that we look at the whole of the tunnel, radius and session tables
3422 // every second
3423 static void regular_cleanups(double period)
3424 {
3425 // Next tunnel, radius and session to check for actions on.
3426 static tunnelidt t = 0;
3427 static int r = 0;
3428 static sessionidt s = 0;
3429
3430 int t_actions = 0;
3431 int r_actions = 0;
3432 int s_actions = 0;
3433
3434 int t_slice;
3435 int r_slice;
3436 int s_slice;
3437
3438 int i;
3439 int a;
3440
3441 // divide up tables into slices based on the last run
3442 t_slice = config->cluster_highest_tunnelid * period;
3443 r_slice = (MAXRADIUS - 1) * period;
3444 s_slice = config->cluster_highest_sessionid * period;
3445
3446 if (t_slice < 1)
3447 t_slice = 1;
3448 else if (t_slice > config->cluster_highest_tunnelid)
3449 t_slice = config->cluster_highest_tunnelid;
3450
3451 if (r_slice < 1)
3452 r_slice = 1;
3453 else if (r_slice > (MAXRADIUS - 1))
3454 r_slice = MAXRADIUS - 1;
3455
3456 if (s_slice < 1)
3457 s_slice = 1;
3458 else if (s_slice > config->cluster_highest_sessionid)
3459 s_slice = config->cluster_highest_sessionid;
3460
3461 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3462
3463 for (i = 0; i < t_slice; i++)
3464 {
3465 t++;
3466 if (t > config->cluster_highest_tunnelid)
3467 t = 1;
3468
3469 if (t == TUNNEL_ID_PPPOE)
3470 continue;
3471
3472 // check for expired tunnels
3473 if (tunnel[t].die && tunnel[t].die <= TIME)
3474 {
3475 STAT(tunnel_timeout);
3476 tunnelkill(t, "Expired");
3477 t_actions++;
3478 continue;
3479 }
3480 // check for message resend
3481 if (tunnel[t].retry && tunnel[t].controlc)
3482 {
3483 // resend pending messages as timeout on reply
3484 if (tunnel[t].retry <= TIME)
3485 {
3486 controlt *c = tunnel[t].controls;
3487 uint16_t w = tunnel[t].window;
3488 tunnel[t].try++; // another try
3489 if (tunnel[t].try > 5)
3490 tunnelkill(t, "Timeout on control message"); // game over
3491 else
3492 while (c && w--)
3493 {
3494 tunnelsend(c->buf, c->length, t);
3495 c = c->next;
3496 }
3497
3498 t_actions++;
3499 }
3500 }
3501 // Send hello
3502 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3503 {
3504 if (!config->disable_sending_hello)
3505 {
3506 controlt *c = controlnew(6); // sending HELLO
3507 controladd(c, 0, t); // send the message
3508 LOG(3, 0, t, "Sending HELLO message\n");
3509 t_actions++;
3510 }
3511 }
3512
3513 // Check for tunnel changes requested from the CLI
3514 if ((a = cli_tunnel_actions[t].action))
3515 {
3516 cli_tunnel_actions[t].action = 0;
3517 if (a & CLI_TUN_KILL)
3518 {
3519 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3520 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3521 t_actions++;
3522 }
3523 }
3524 }
3525
3526 for (i = 0; i < r_slice; i++)
3527 {
3528 r++;
3529 if (r >= MAXRADIUS)
3530 r = 1;
3531
3532 if (!radius[r].state)
3533 continue;
3534
3535 if (radius[r].retry <= TIME)
3536 {
3537 radiusretry(r);
3538 r_actions++;
3539 }
3540 }
3541
3542 for (i = 0; i < s_slice; i++)
3543 {
3544 s++;
3545 if (s > config->cluster_highest_sessionid)
3546 s = 1;
3547
3548 if (!session[s].opened) // Session isn't in use
3549 continue;
3550
3551 // check for expired sessions
3552 if (session[s].die)
3553 {
3554 if (session[s].die <= TIME)
3555 {
3556 sessionkill(s, "Expired");
3557 s_actions++;
3558 }
3559 continue;
3560 }
3561
3562 // PPP timeouts
3563 if (sess_local[s].lcp.restart <= time_now)
3564 {
3565 int next_state = session[s].ppp.lcp;
3566 switch (session[s].ppp.lcp)
3567 {
3568 case RequestSent:
3569 case AckReceived:
3570 next_state = RequestSent;
3571
3572 case AckSent:
3573 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3574 {
3575 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3576 sendlcp(s, session[s].tunnel);
3577 change_state(s, lcp, next_state);
3578 }
3579 else
3580 {
3581 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3582 STAT(session_timeout);
3583 }
3584
3585 s_actions++;
3586 }
3587
3588 if (session[s].die)
3589 continue;
3590 }
3591
3592 if (sess_local[s].ipcp.restart <= time_now)
3593 {
3594 int next_state = session[s].ppp.ipcp;
3595 switch (session[s].ppp.ipcp)
3596 {
3597 case RequestSent:
3598 case AckReceived:
3599 next_state = RequestSent;
3600
3601 case AckSent:
3602 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3603 {
3604 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3605 sendipcp(s, session[s].tunnel);
3606 change_state(s, ipcp, next_state);
3607 }
3608 else
3609 {
3610 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3611 STAT(session_timeout);
3612 }
3613
3614 s_actions++;
3615 }
3616
3617 if (session[s].die)
3618 continue;
3619 }
3620
3621 if (sess_local[s].ipv6cp.restart <= time_now)
3622 {
3623 int next_state = session[s].ppp.ipv6cp;
3624 switch (session[s].ppp.ipv6cp)
3625 {
3626 case RequestSent:
3627 case AckReceived:
3628 next_state = RequestSent;
3629
3630 case AckSent:
3631 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3632 {
3633 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3634 sendipv6cp(s, session[s].tunnel);
3635 change_state(s, ipv6cp, next_state);
3636 }
3637 else
3638 {
3639 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3640 change_state(s, ipv6cp, Stopped);
3641 }
3642
3643 s_actions++;
3644 }
3645 }
3646
3647 if (sess_local[s].ccp.restart <= time_now)
3648 {
3649 int next_state = session[s].ppp.ccp;
3650 switch (session[s].ppp.ccp)
3651 {
3652 case RequestSent:
3653 case AckReceived:
3654 next_state = RequestSent;
3655
3656 case AckSent:
3657 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3658 {
3659 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3660 sendccp(s, session[s].tunnel);
3661 change_state(s, ccp, next_state);
3662 }
3663 else
3664 {
3665 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3666 change_state(s, ccp, Stopped);
3667 }
3668
3669 s_actions++;
3670 }
3671 }
3672
3673 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3674 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3675 {
3676 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3677 STAT(session_timeout);
3678 s_actions++;
3679 continue;
3680 }
3681
3682 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3683 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3684 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3685 {
3686 uint8_t b[MAXETHER];
3687
3688 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3689 if (!q) continue;
3690
3691 *q = EchoReq;
3692 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3693 *(uint16_t *)(q + 2) = htons(8); // Length
3694 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3695
3696 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3697 (int)(time_now - session[s].last_packet));
3698
3699 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3700 sess_local[s].last_echo = time_now;
3701 s_actions++;
3702 }
3703
3704 // Drop sessions who have reached session_timeout seconds
3705 if (session[s].session_timeout)
3706 {
3707 bundleidt bid = session[s].bundle;
3708 if (bid)
3709 {
3710 if (time_now - bundle[bid].last_check >= 1)
3711 {
3712 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3713 bundle[bid].last_check = time_now;
3714 if (bundle[bid].online_time >= session[s].session_timeout)
3715 {
3716 int ses;
3717 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3718 {
3719 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3720 s_actions++;
3721 continue;
3722 }
3723 }
3724 }
3725 }
3726 else if (time_now - session[s].opened >= session[s].session_timeout)
3727 {
3728 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3729 s_actions++;
3730 continue;
3731 }
3732 }
3733
3734 // Drop sessions who have reached idle_timeout seconds
3735 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3736 {
3737 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3738 STAT(session_timeout);
3739 s_actions++;
3740 continue;
3741 }
3742
3743 // Check for actions requested from the CLI
3744 if ((a = cli_session_actions[s].action))
3745 {
3746 int send = 0;
3747
3748 cli_session_actions[s].action = 0;
3749 if (a & CLI_SESS_KILL)
3750 {
3751 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3752 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3753 a = 0; // dead, no need to check for other actions
3754 s_actions++;
3755 }
3756
3757 if (a & CLI_SESS_NOSNOOP)
3758 {
3759 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3760 session[s].snoop_ip = 0;
3761 session[s].snoop_port = 0;
3762 s_actions++;
3763 send++;
3764 }
3765 else if (a & CLI_SESS_SNOOP)
3766 {
3767 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3768 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3769 cli_session_actions[s].snoop_port);
3770
3771 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3772 session[s].snoop_port = cli_session_actions[s].snoop_port;
3773 s_actions++;
3774 send++;
3775 }
3776
3777 if (a & CLI_SESS_NOTHROTTLE)
3778 {
3779 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3780 throttle_session(s, 0, 0);
3781 s_actions++;
3782 send++;
3783 }
3784 else if (a & CLI_SESS_THROTTLE)
3785 {
3786 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3787 cli_session_actions[s].throttle_in,
3788 cli_session_actions[s].throttle_out);
3789
3790 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3791 s_actions++;
3792 send++;
3793 }
3794
3795 if (a & CLI_SESS_NOFILTER)
3796 {
3797 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3798 filter_session(s, 0, 0);
3799 s_actions++;
3800 send++;
3801 }
3802 else if (a & CLI_SESS_FILTER)
3803 {
3804 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3805 cli_session_actions[s].filter_in,
3806 cli_session_actions[s].filter_out);
3807
3808 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3809 s_actions++;
3810 send++;
3811 }
3812
3813 if (send)
3814 cluster_send_session(s);
3815 }
3816
3817 // RADIUS interim accounting
3818 if (config->radius_accounting && config->radius_interim > 0
3819 && session[s].ip && !session[s].walled_garden
3820 && !sess_local[s].radius // RADIUS already in progress
3821 && time_now - sess_local[s].last_interim >= config->radius_interim
3822 && session[s].flags & SESSION_STARTED)
3823 {
3824 int rad = radiusnew(s);
3825 if (!rad)
3826 {
3827 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3828 STAT(radius_overflow);
3829 continue;
3830 }
3831
3832 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3833 session[s].user, session[s].unique_id);
3834
3835 radiussend(rad, RADIUSINTERIM);
3836 sess_local[s].last_interim = time_now;
3837 s_actions++;
3838 }
3839 }
3840
3841 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3842 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3843 }
3844
3845 //
3846 // Are we in the middle of a tunnel update, or radius
3847 // requests??
3848 //
3849 static int still_busy(void)
3850 {
3851 int i;
3852 static clockt last_talked = 0;
3853 static clockt start_busy_wait = 0;
3854
3855 #ifdef BGP
3856 static time_t stopped_bgp = 0;
3857 if (bgp_configured)
3858 {
3859 if (!stopped_bgp)
3860 {
3861 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3862
3863 for (i = 0; i < BGP_NUM_PEERS; i++)
3864 if (bgp_peers[i].state == Established)
3865 bgp_stop(&bgp_peers[i]);
3866
3867 stopped_bgp = time_now;
3868
3869 if (!config->cluster_iam_master)
3870 {
3871 // we don't want to become master
3872 cluster_send_ping(0);
3873
3874 return 1;
3875 }
3876 }
3877
3878 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3879 return 1;
3880 }
3881 #endif /* BGP */
3882
3883 if (!config->cluster_iam_master)
3884 return 0;
3885
3886 if (main_quit == QUIT_SHUTDOWN)
3887 {
3888 static int dropped = 0;
3889 if (!dropped)
3890 {
3891 int i;
3892
3893 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3894 for (i = 1; i < MAXTUNNEL; i++)
3895 if (tunnel[i].ip || tunnel[i].state)
3896 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3897
3898 dropped = 1;
3899 }
3900 }
3901
3902 if (start_busy_wait == 0)
3903 start_busy_wait = TIME;
3904
3905 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3906 {
3907 if (!tunnel[i].controlc)
3908 continue;
3909
3910 if (last_talked != TIME)
3911 {
3912 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3913 last_talked = TIME;
3914 }
3915 return 1;
3916 }
3917
3918 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3919 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3920 {
3921 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3922 return 0;
3923 }
3924
3925 for (i = 1; i < MAXRADIUS; i++)
3926 {
3927 if (radius[i].state == RADIUSNULL)
3928 continue;
3929 if (radius[i].state == RADIUSWAIT)
3930 continue;
3931
3932 if (last_talked != TIME)
3933 {
3934 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3935 last_talked = TIME;
3936 }
3937 return 1;
3938 }
3939
3940 return 0;
3941 }
3942
3943 #ifdef HAVE_EPOLL
3944 # include <sys/epoll.h>
3945 #else
3946 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3947 # include "fake_epoll.h"
3948 #endif
3949
3950 #ifdef LAC
3951 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac, pppoedisc, pppoesess
3952 #define BASE_FDS 10
3953 #else
3954 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, pppoedisc, pppoesess
3955 #define BASE_FDS 9
3956 #endif
3957
3958 // additional polled fds
3959 #ifdef BGP
3960 # define EXTRA_FDS BGP_NUM_PEERS
3961 #else
3962 # define EXTRA_FDS 0
3963 #endif
3964
3965 // main loop - gets packets on tun or udp and processes them
3966 static void mainloop(void)
3967 {
3968 int i;
3969 uint8_t buf[65536];
3970 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3971 // and the forwarded pppoe session
3972 int size_bufp = sizeof(buf) - 32;
3973 clockt next_cluster_ping = 0; // send initial ping immediately
3974 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3975 int maxevent = sizeof(events)/sizeof(*events);
3976
3977 if ((epollfd = epoll_create(maxevent)) < 0)
3978 {
3979 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3980 exit(1);
3981 }
3982
3983 #ifdef LAC
3984 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",
3985 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
3986 #else
3987 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d, pppoefd=%d, pppoesessfd=%d\n",
3988 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, pppoediscfd, pppoesessfd);
3989 #endif
3990
3991 /* setup our fds to poll for input */
3992 {
3993 static struct event_data d[BASE_FDS];
3994 struct epoll_event e;
3995
3996 e.events = EPOLLIN;
3997 i = 0;
3998
3999 if (clifd >= 0)
4000 {
4001 d[i].type = FD_TYPE_CLI;
4002 e.data.ptr = &d[i++];
4003 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4004 }
4005
4006 d[i].type = FD_TYPE_CLUSTER;
4007 e.data.ptr = &d[i++];
4008 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4009
4010 d[i].type = FD_TYPE_TUN;
4011 e.data.ptr = &d[i++];
4012 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4013
4014 d[i].type = FD_TYPE_UDP;
4015 e.data.ptr = &d[i++];
4016 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
4017
4018 d[i].type = FD_TYPE_CONTROL;
4019 e.data.ptr = &d[i++];
4020 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4021
4022 d[i].type = FD_TYPE_DAE;
4023 e.data.ptr = &d[i++];
4024 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4025
4026 d[i].type = FD_TYPE_NETLINK;
4027 e.data.ptr = &d[i++];
4028 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4029
4030 #ifdef LAC
4031 d[i].type = FD_TYPE_UDPLAC;
4032 e.data.ptr = &d[i++];
4033 epoll_ctl(epollfd, EPOLL_CTL_ADD, udplacfd, &e);
4034 #endif
4035
4036 d[i].type = FD_TYPE_PPPOEDISC;
4037 e.data.ptr = &d[i++];
4038 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4039
4040 d[i].type = FD_TYPE_PPPOESESS;
4041 e.data.ptr = &d[i++];
4042 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4043 }
4044
4045 #ifdef BGP
4046 signal(SIGPIPE, SIG_IGN);
4047 bgp_setup(config->as_number);
4048 if (config->bind_address)
4049 bgp_add_route(config->bind_address, 0xffffffff);
4050
4051 for (i = 0; i < BGP_NUM_PEERS; i++)
4052 {
4053 if (config->neighbour[i].name[0])
4054 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4055 config->neighbour[i].as, config->neighbour[i].keepalive,
4056 config->neighbour[i].hold, config->neighbour[i].update_source,
4057 0); /* 0 = routing disabled */
4058 }
4059 #endif /* BGP */
4060
4061 while (!main_quit || still_busy())
4062 {
4063 int more = 0;
4064 int n;
4065
4066
4067 if (main_reload)
4068 {
4069 main_reload = 0;
4070 read_config_file();
4071 config->reload_config++;
4072 }
4073
4074 if (config->reload_config)
4075 {
4076 config->reload_config = 0;
4077 update_config();
4078 }
4079
4080 #ifdef BGP
4081 bgp_set_poll();
4082 #endif /* BGP */
4083
4084 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4085 STAT(select_called);
4086
4087 TIME = now(NULL);
4088 if (n < 0)
4089 {
4090 if (errno == EINTR ||
4091 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4092 continue;
4093
4094 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4095 break; // exit
4096 }
4097
4098 if (n)
4099 {
4100 struct sockaddr_in addr;
4101 struct in_addr local;
4102 socklen_t alen;
4103 int c, s;
4104 int udp_ready = 0;
4105 #ifdef LAC
4106 int udplac_ready = 0;
4107 int udplac_pkts = 0;
4108 #endif
4109 int pppoesess_ready = 0;
4110 int pppoesess_pkts = 0;
4111 int tun_ready = 0;
4112 int cluster_ready = 0;
4113 int udp_pkts = 0;
4114 int tun_pkts = 0;
4115 int cluster_pkts = 0;
4116 #ifdef BGP
4117 uint32_t bgp_events[BGP_NUM_PEERS];
4118 memset(bgp_events, 0, sizeof(bgp_events));
4119 #endif /* BGP */
4120
4121 for (c = n, i = 0; i < c; i++)
4122 {
4123 struct event_data *d = events[i].data.ptr;
4124
4125 switch (d->type)
4126 {
4127 case FD_TYPE_CLI: // CLI connections
4128 {
4129 int cli;
4130
4131 alen = sizeof(addr);
4132 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4133 {
4134 cli_do(cli);
4135 close(cli);
4136 }
4137 else
4138 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4139
4140 n--;
4141 break;
4142 }
4143
4144 // these are handled below, with multiple interleaved reads
4145 case FD_TYPE_CLUSTER: cluster_ready++; break;
4146 case FD_TYPE_TUN: tun_ready++; break;
4147 case FD_TYPE_UDP: udp_ready++; break;
4148 #ifdef LAC
4149 case FD_TYPE_UDPLAC: udplac_ready++; break;
4150 #endif
4151 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4152
4153 case FD_TYPE_PPPOEDISC: // pppoe discovery
4154 s = read(pppoediscfd, p, size_bufp);
4155 if (s > 0) process_pppoe_disc(p, s);
4156 n--;
4157 break;
4158
4159 case FD_TYPE_CONTROL: // nsctl commands
4160 alen = sizeof(addr);
4161 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4162 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4163 n--;
4164 break;
4165
4166 case FD_TYPE_DAE: // DAE requests
4167 alen = sizeof(addr);
4168 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4169 if (s > 0) processdae(p, s, &addr, alen, &local);
4170 n--;
4171 break;
4172
4173 case FD_TYPE_RADIUS: // RADIUS response
4174 alen = sizeof(addr);
4175 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4176 if (s >= 0 && config->cluster_iam_master)
4177 {
4178 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4179 addr.sin_addr.s_addr == config->radiusserver[1])
4180 processrad(p, s, d->index);
4181 else
4182 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4183 fmtaddr(addr.sin_addr.s_addr, 0));
4184 }
4185
4186 n--;
4187 break;
4188
4189 #ifdef BGP
4190 case FD_TYPE_BGP:
4191 bgp_events[d->index] = events[i].events;
4192 n--;
4193 break;
4194 #endif /* BGP */
4195
4196 case FD_TYPE_NETLINK:
4197 {
4198 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4199 s = netlink_recv(p, size_bufp);
4200 if (nh->nlmsg_type == NLMSG_ERROR)
4201 {
4202 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4203 if (errmsg->error)
4204 {
4205 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4206 {
4207 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4208 exit(1);
4209 }
4210 else
4211
4212 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4213 }
4214 // else it's a ack
4215 }
4216 else
4217 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);
4218 n--;
4219 break;
4220 }
4221
4222 default:
4223 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4224 }
4225 }
4226
4227 #ifdef BGP
4228 bgp_process(bgp_events);
4229 #endif /* BGP */
4230
4231 for (c = 0; n && c < config->multi_read_count; c++)
4232 {
4233 // L2TP
4234 if (udp_ready)
4235 {
4236 alen = sizeof(addr);
4237 if ((s = recvfrom(udpfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4238 {
4239 processudp(p, s, &addr);
4240 udp_pkts++;
4241 }
4242 else
4243 {
4244 udp_ready = 0;
4245 n--;
4246 }
4247 }
4248 #ifdef LAC
4249 // L2TP REMOTE LNS
4250 if (udplac_ready)
4251 {
4252 alen = sizeof(addr);
4253 if ((s = recvfrom(udplacfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4254 {
4255 if (!config->disable_lac_func)
4256 processudp(p, s, &addr);
4257
4258 udplac_pkts++;
4259 }
4260 else
4261 {
4262 udplac_ready = 0;
4263 n--;
4264 }
4265 }
4266 #endif
4267 // incoming IP
4268 if (tun_ready)
4269 {
4270 if ((s = read(tunfd, p, size_bufp)) > 0)
4271 {
4272 processtun(p, s);
4273 tun_pkts++;
4274 }
4275 else
4276 {
4277 tun_ready = 0;
4278 n--;
4279 }
4280 }
4281
4282 // pppoe session
4283 if (pppoesess_ready)
4284 {
4285 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4286 {
4287 process_pppoe_sess(p, s);
4288 pppoesess_pkts++;
4289 }
4290 else
4291 {
4292 pppoesess_ready = 0;
4293 n--;
4294 }
4295 }
4296
4297 // cluster
4298 if (cluster_ready)
4299 {
4300 alen = sizeof(addr);
4301 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4302 {
4303 processcluster(p, s, addr.sin_addr.s_addr);
4304 cluster_pkts++;
4305 }
4306 else
4307 {
4308 cluster_ready = 0;
4309 n--;
4310 }
4311 }
4312 }
4313
4314 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
4315 STAT(multi_read_used);
4316
4317 if (c >= config->multi_read_count)
4318 {
4319 #ifdef LAC
4320 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster %d rmlns and %d pppoe packets\n",
4321 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, udplac_pkts, pppoesess_pkts);
4322 #else
4323 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4324 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, pppoesess_pkts);
4325 #endif
4326 STAT(multi_read_exceeded);
4327 more++;
4328 }
4329 }
4330 #ifdef BGP
4331 else
4332 /* no event received, but timers could still have expired */
4333 bgp_process_peers_timers();
4334 #endif /* BGP */
4335
4336 if (time_changed)
4337 {
4338 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4339
4340 // Log current traffic stats
4341 snprintf(config->bandwidth, sizeof(config->bandwidth),
4342 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4343 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4344 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4345 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4346
4347 udp_tx = udp_rx = 0;
4348 udp_rx_pkt = eth_rx_pkt = 0;
4349 eth_tx = eth_rx = 0;
4350 time_changed = 0;
4351
4352 if (config->dump_speed)
4353 printf("%s\n", config->bandwidth);
4354
4355 // Update the internal time counter
4356 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4357
4358 {
4359 // Run timer hooks
4360 struct param_timer p = { time_now };
4361 run_plugins(PLUGIN_TIMER, &p);
4362 }
4363 }
4364
4365 // Runs on every machine (master and slaves).
4366 if (next_cluster_ping <= TIME)
4367 {
4368 // Check to see which of the cluster is still alive..
4369
4370 cluster_send_ping(basetime); // Only does anything if we're a slave
4371 cluster_check_master(); // ditto.
4372
4373 cluster_heartbeat(); // Only does anything if we're a master.
4374 cluster_check_slaves(); // ditto.
4375
4376 master_update_counts(); // If we're a slave, send our byte counters to our master.
4377
4378 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4379 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4380 else
4381 next_cluster_ping = TIME + config->cluster_hb_interval;
4382 }
4383
4384 if (!config->cluster_iam_master)
4385 continue;
4386
4387 // Run token bucket filtering queue..
4388 // Only run it every 1/10th of a second.
4389 {
4390 static clockt last_run = 0;
4391 if (last_run != TIME)
4392 {
4393 last_run = TIME;
4394 tbf_run_timer();
4395 }
4396 }
4397
4398 // Handle timeouts, retries etc.
4399 {
4400 static double last_clean = 0;
4401 double this_clean;
4402 double diff;
4403
4404 TIME = now(&this_clean);
4405 diff = this_clean - last_clean;
4406
4407 // Run during idle time (after we've handled
4408 // all incoming packets) or every 1/10th sec
4409 if (!more || diff > 0.1)
4410 {
4411 regular_cleanups(diff);
4412 last_clean = this_clean;
4413 }
4414 }
4415
4416 if (*config->accounting_dir)
4417 {
4418 static clockt next_acct = 0;
4419 static clockt next_shut_acct = 0;
4420
4421 if (next_acct <= TIME)
4422 {
4423 // Dump accounting data
4424 next_acct = TIME + ACCT_TIME;
4425 next_shut_acct = TIME + ACCT_SHUT_TIME;
4426 dump_acct_info(1);
4427 }
4428 else if (next_shut_acct <= TIME)
4429 {
4430 // Dump accounting data for shutdown sessions
4431 next_shut_acct = TIME + ACCT_SHUT_TIME;
4432 if (shut_acct_n)
4433 dump_acct_info(0);
4434 }
4435 }
4436 }
4437
4438 // Are we the master and shutting down??
4439 if (config->cluster_iam_master)
4440 cluster_heartbeat(); // Flush any queued changes..
4441
4442 // Ok. Notify everyone we're shutting down. If we're
4443 // the master, this will force an election.
4444 cluster_send_ping(0);
4445
4446 //
4447 // Important!!! We MUST not process any packets past this point!
4448 LOG(1, 0, 0, "Shutdown complete\n");
4449 }
4450
4451 static void stripdomain(char *host)
4452 {
4453 char *p;
4454
4455 if ((p = strchr(host, '.')))
4456 {
4457 char *domain = 0;
4458 char _domain[1024];
4459
4460 // strip off domain
4461 FILE *resolv = fopen("/etc/resolv.conf", "r");
4462 if (resolv)
4463 {
4464 char buf[1024];
4465 char *b;
4466
4467 while (fgets(buf, sizeof(buf), resolv))
4468 {
4469 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4470 continue;
4471
4472 if (!isspace(buf[6]))
4473 continue;
4474
4475 b = buf + 7;
4476 while (isspace(*b)) b++;
4477
4478 if (*b)
4479 {
4480 char *d = b;
4481 while (*b && !isspace(*b)) b++;
4482 *b = 0;
4483 if (buf[0] == 'd') // domain is canonical
4484 {
4485 domain = d;
4486 break;
4487 }
4488
4489 // first search line
4490 if (!domain)
4491 {
4492 // hold, may be subsequent domain line
4493 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4494 domain = _domain;
4495 }
4496 }
4497 }
4498
4499 fclose(resolv);
4500 }
4501
4502 if (domain)
4503 {
4504 int hl = strlen(host);
4505 int dl = strlen(domain);
4506 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4507 host[hl -dl - 1] = 0;
4508 }
4509 else
4510 {
4511 *p = 0; // everything after first dot
4512 }
4513 }
4514 }
4515
4516 // Init data structures
4517 static void initdata(int optdebug, char *optconfig)
4518 {
4519 int i;
4520
4521 if (!(config = shared_malloc(sizeof(configt))))
4522 {
4523 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4524 exit(1);
4525 }
4526
4527 memset(config, 0, sizeof(configt));
4528 time(&config->start_time);
4529 strncpy(config->config_file, optconfig, strlen(optconfig));
4530 config->debug = optdebug;
4531 config->num_tbfs = MAXTBFS;
4532 config->rl_rate = 28; // 28kbps
4533 config->cluster_mcast_ttl = 1;
4534 config->cluster_master_min_adv = 1;
4535 config->ppp_restart_time = 3;
4536 config->ppp_max_configure = 10;
4537 config->ppp_max_failure = 5;
4538 config->kill_timedout_sessions = 1;
4539 strcpy(config->random_device, RANDOMDEVICE);
4540 // Set default value echo_timeout and idle_echo_timeout
4541 config->echo_timeout = ECHO_TIMEOUT;
4542 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4543
4544 log_stream = stderr;
4545
4546 #ifdef RINGBUFFER
4547 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4548 {
4549 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4550 exit(1);
4551 }
4552 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4553 #endif
4554
4555 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4556 {
4557 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4558 exit(1);
4559 }
4560 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4561 {
4562 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4563 exit(1);
4564 }
4565 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4566 {
4567 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4568 exit(1);
4569 }
4570 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4571 {
4572 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4573 exit(1);
4574 }
4575 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4576 {
4577 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4578 exit(1);
4579 }
4580
4581 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4582 {
4583 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4584 exit(1);
4585 }
4586
4587 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4588 {
4589 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4590 exit(1);
4591 }
4592
4593 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4594 {
4595 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4596 exit(1);
4597 }
4598
4599 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4600 {
4601 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4602 exit(1);
4603 }
4604 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4605
4606 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4607 {
4608 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4609 exit(1);
4610 }
4611 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4612
4613 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4614 {
4615 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4616 exit(1);
4617 }
4618 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4619
4620 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4621 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4622 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4623 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4624 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4625
4626 // Put all the sessions on the free list marked as undefined.
4627 for (i = 1; i < MAXSESSION; i++)
4628 {
4629 session[i].next = i + 1;
4630 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4631 }
4632 session[MAXSESSION - 1].next = 0;
4633 sessionfree = 1;
4634
4635 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4636 for (i = 1; i < MAXTUNNEL; i++)
4637 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4638
4639 for (i = 1; i < MAXBUNDLE; i++) {
4640 bundle[i].state = BUNDLEUNDEF;
4641 }
4642
4643 if (!*hostname)
4644 {
4645 // Grab my hostname unless it's been specified
4646 gethostname(hostname, sizeof(hostname));
4647 stripdomain(hostname);
4648 }
4649
4650 _statistics->start_time = _statistics->last_reset = time(NULL);
4651
4652 #ifdef BGP
4653 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4654 {
4655 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4656 exit(1);
4657 }
4658 #endif /* BGP */
4659
4660 #ifdef LAC
4661 lac_initremotelnsdata();
4662 #endif
4663 }
4664
4665 static int assign_ip_address(sessionidt s)
4666 {
4667 uint32_t i;
4668 int best = -1;
4669 time_t best_time = time_now;
4670 char *u = session[s].user;
4671 char reuse = 0;
4672
4673
4674 CSTAT(assign_ip_address);
4675
4676 for (i = 1; i < ip_pool_size; i++)
4677 {
4678 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4679 continue;
4680
4681 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4682 {
4683 best = i;
4684 reuse = 1;
4685 break;
4686 }
4687
4688 if (ip_address_pool[i].last < best_time)
4689 {
4690 best = i;
4691 if (!(best_time = ip_address_pool[i].last))
4692 break; // never used, grab this one
4693 }
4694 }
4695
4696 if (best < 0)
4697 {
4698 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4699 return 0;
4700 }
4701
4702 session[s].ip = ip_address_pool[best].address;
4703 session[s].ip_pool_index = best;
4704 ip_address_pool[best].assigned = 1;
4705 ip_address_pool[best].last = time_now;
4706 ip_address_pool[best].session = s;
4707 if (session[s].walled_garden)
4708 /* Don't track addresses of users in walled garden (note: this
4709 means that their address isn't "sticky" even if they get
4710 un-gardened). */
4711 ip_address_pool[best].user[0] = 0;
4712 else
4713 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4714
4715 STAT(ip_allocated);
4716 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4717 reuse ? "Reusing" : "Allocating", best);
4718
4719 return 1;
4720 }
4721
4722 static void free_ip_address(sessionidt s)
4723 {
4724 int i = session[s].ip_pool_index;
4725
4726
4727 CSTAT(free_ip_address);
4728
4729 if (!session[s].ip)
4730 return; // what the?
4731
4732 if (i < 0) // Is this actually part of the ip pool?
4733 i = 0;
4734
4735 STAT(ip_freed);
4736 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4737 session[s].ip = 0;
4738 ip_address_pool[i].assigned = 0;
4739 ip_address_pool[i].session = 0;
4740 ip_address_pool[i].last = time_now;
4741 }
4742
4743 //
4744 // Fsck the address pool against the session table.
4745 // Normally only called when we become a master.
4746 //
4747 // This isn't perfect: We aren't keep tracking of which
4748 // users used to have an IP address.
4749 //
4750 void rebuild_address_pool(void)
4751 {
4752 int i;
4753
4754 //
4755 // Zero the IP pool allocation, and build
4756 // a map from IP address to pool index.
4757 for (i = 1; i < MAXIPPOOL; ++i)
4758 {
4759 ip_address_pool[i].assigned = 0;
4760 ip_address_pool[i].session = 0;
4761 if (!ip_address_pool[i].address)
4762 continue;
4763
4764 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4765 }
4766
4767 for (i = 0; i < MAXSESSION; ++i)
4768 {
4769 int ipid;
4770 if (!(session[i].opened && session[i].ip))
4771 continue;
4772
4773 ipid = - lookup_ipmap(htonl(session[i].ip));
4774
4775 if (session[i].ip_pool_index < 0)
4776 {
4777 // Not allocated out of the pool.
4778 if (ipid < 1) // Not found in the pool either? good.
4779 continue;
4780
4781 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4782 i, fmtaddr(session[i].ip, 0), ipid);
4783
4784 // Fall through and process it as part of the pool.
4785 }
4786
4787
4788 if (ipid > MAXIPPOOL || ipid < 0)
4789 {
4790 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4791 ipid = -1;
4792 session[i].ip_pool_index = ipid;
4793 continue;
4794 }
4795
4796 ip_address_pool[ipid].assigned = 1;
4797 ip_address_pool[ipid].session = i;
4798 ip_address_pool[ipid].last = time_now;
4799 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4800 session[i].ip_pool_index = ipid;
4801 cache_ipmap(session[i].ip, i); // Fix the ip map.
4802 }
4803 }
4804
4805 //
4806 // Fix the address pool to match a changed session.
4807 // (usually when the master sends us an update).
4808 static void fix_address_pool(int sid)
4809 {
4810 int ipid;
4811
4812 ipid = session[sid].ip_pool_index;
4813
4814 if (ipid > ip_pool_size)
4815 return; // Ignore it. rebuild_address_pool will fix it up.
4816
4817 if (ip_address_pool[ipid].address != session[sid].ip)
4818 return; // Just ignore it. rebuild_address_pool will take care of it.
4819
4820 ip_address_pool[ipid].assigned = 1;
4821 ip_address_pool[ipid].session = sid;
4822 ip_address_pool[ipid].last = time_now;
4823 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4824 }
4825
4826 //
4827 // Add a block of addresses to the IP pool to hand out.
4828 //
4829 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4830 {
4831 int i;
4832 if (prefixlen == 0)
4833 prefixlen = 32; // Host route only.
4834
4835 addr &= 0xffffffff << (32 - prefixlen);
4836
4837 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4838 return ;
4839
4840 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4841 {
4842 if ((i & 0xff) == 0 || (i&0xff) == 255)
4843 continue; // Skip 0 and broadcast addresses.
4844
4845 ip_address_pool[ip_pool_size].address = i;
4846 ip_address_pool[ip_pool_size].assigned = 0;
4847 ++ip_pool_size;
4848 if (ip_pool_size >= MAXIPPOOL)
4849 {
4850 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4851 return;
4852 }
4853 }
4854 }
4855
4856 // Initialize the IP address pool
4857 static void initippool()
4858 {
4859 FILE *f;
4860 char *p;
4861 char buf[4096];
4862 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4863
4864 if (!(f = fopen(IPPOOLFILE, "r")))
4865 {
4866 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4867 exit(1);
4868 }
4869
4870 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4871 {
4872 char *pool = buf;
4873 buf[4095] = 0; // Force it to be zero terminated/
4874
4875 if (*buf == '#' || *buf == '\n')
4876 continue; // Skip comments / blank lines
4877 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4878 if ((p = (char *)strchr(buf, ':')))
4879 {
4880 in_addr_t src;
4881 *p = '\0';
4882 src = inet_addr(buf);
4883 if (src == INADDR_NONE)
4884 {
4885 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4886 exit(1);
4887 }
4888 // This entry is for a specific IP only
4889 if (src != config->bind_address)
4890 continue;
4891 *p = ':';
4892 pool = p+1;
4893 }
4894 if ((p = (char *)strchr(pool, '/')))
4895 {
4896 // It's a range
4897 int numbits = 0;
4898 in_addr_t start = 0;
4899
4900 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4901 *p++ = 0;
4902 if (!*p || !(numbits = atoi(p)))
4903 {
4904 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4905 continue;
4906 }
4907 start = ntohl(inet_addr(pool));
4908
4909 // Add a static route for this pool
4910 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4911 fmtaddr(htonl(start), 0), numbits);
4912
4913 routeset(0, start, numbits, 0, 1);
4914
4915 add_to_ip_pool(start, numbits);
4916 }
4917 else
4918 {
4919 // It's a single ip address
4920 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4921 }
4922 }
4923 fclose(f);
4924 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4925 }
4926
4927 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4928 {
4929 struct sockaddr_in snoop_addr = {0};
4930 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4931 return;
4932
4933 snoop_addr.sin_family = AF_INET;
4934 snoop_addr.sin_addr.s_addr = destination;
4935 snoop_addr.sin_port = ntohs(port);
4936
4937 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4938 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4939 htons(snoop_addr.sin_port));
4940
4941 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4942 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4943
4944 STAT(packets_snooped);
4945 }
4946
4947 static int dump_session(FILE **f, sessiont *s)
4948 {
4949 #ifdef LAC
4950 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4951 #else
4952 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4953 #endif
4954 return 1;
4955
4956 if (!*f)
4957 {
4958 char filename[1024];
4959 char timestr[64];
4960 time_t now = time(NULL);
4961
4962 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4963 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4964
4965 if (!(*f = fopen(filename, "w")))
4966 {
4967 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4968 return 0;
4969 }
4970
4971 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4972 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4973 "# host: %s\n"
4974 "# endpoint: %s\n"
4975 "# time: %ld\n"
4976 "# uptime: %ld\n"
4977 "# format: username ip qos uptxoctets downrxoctets\n",
4978 hostname,
4979 fmtaddr(config->iftun_address ? config->iftun_address : my_address, 0),
4980 now,
4981 now - basetime);
4982 }
4983
4984 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4985 fprintf(*f, "%s %s %d %u %u\n",
4986 s->user, // username
4987 fmtaddr(htonl(s->ip), 0), // ip
4988 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4989 (uint32_t) s->cin_delta, // uptxoctets
4990 (uint32_t) s->cout_delta); // downrxoctets
4991
4992 s->cin_delta = s->cout_delta = 0;
4993
4994 return 1;
4995 }
4996
4997 static void dump_acct_info(int all)
4998 {
4999 int i;
5000 FILE *f = NULL;
5001
5002
5003 CSTAT(dump_acct_info);
5004
5005 if (shut_acct_n)
5006 {
5007 for (i = 0; i < shut_acct_n; i++)
5008 dump_session(&f, &shut_acct[i]);
5009
5010 shut_acct_n = 0;
5011 }
5012
5013 if (all)
5014 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5015 dump_session(&f, &session[i]);
5016
5017 if (f)
5018 fclose(f);
5019 }
5020
5021 // Main program
5022 int main(int argc, char *argv[])
5023 {
5024 int i;
5025 int optdebug = 0;
5026 char *optconfig = CONFIGFILE;
5027
5028 time(&basetime); // start clock
5029
5030 // scan args
5031 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5032 {
5033 switch (i)
5034 {
5035 case 'd':
5036 if (fork()) exit(0);
5037 setsid();
5038 freopen("/dev/null", "r", stdin);
5039 freopen("/dev/null", "w", stdout);
5040 freopen("/dev/null", "w", stderr);
5041 break;
5042 case 'v':
5043 optdebug++;
5044 break;
5045 case 'c':
5046 optconfig = optarg;
5047 break;
5048 case 'h':
5049 snprintf(hostname, sizeof(hostname), "%s", optarg);
5050 break;
5051 default:
5052 printf("Args are:\n"
5053 "\t-d\t\tDetach from terminal\n"
5054 "\t-c <file>\tConfig file\n"
5055 "\t-h <hostname>\tForce hostname\n"
5056 "\t-v\t\tDebug\n");
5057
5058 return (0);
5059 break;
5060 }
5061 }
5062
5063 // Start the timer routine off
5064 time(&time_now);
5065 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5066
5067 initplugins();
5068 initdata(optdebug, optconfig);
5069
5070 init_cli();
5071 read_config_file();
5072 /* set hostname /after/ having read the config file */
5073 if (*config->hostname)
5074 strcpy(hostname, config->hostname);
5075 cli_init_complete(hostname);
5076 update_config();
5077 init_tbf(config->num_tbfs);
5078
5079 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5080 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5081 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5082 {
5083 struct rlimit rlim;
5084 rlim.rlim_cur = RLIM_INFINITY;
5085 rlim.rlim_max = RLIM_INFINITY;
5086 // Remove the maximum core size
5087 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5088 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5089
5090 // Make core dumps go to /tmp
5091 chdir("/tmp");
5092 }
5093
5094 if (config->scheduler_fifo)
5095 {
5096 int ret;
5097 struct sched_param params = {0};
5098 params.sched_priority = 1;
5099
5100 if (get_nprocs() < 2)
5101 {
5102 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5103 config->scheduler_fifo = 0;
5104 }
5105 else
5106 {
5107 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5108 {
5109 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5110 }
5111 else
5112 {
5113 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5114 config->scheduler_fifo = 0;
5115 }
5116 }
5117 }
5118
5119 initnetlink();
5120
5121 /* Set up the cluster communications port. */
5122 if (cluster_init() < 0)
5123 exit(1);
5124
5125 inittun();
5126 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5127
5128 if (*config->pppoe_if_to_bind)
5129 {
5130 init_pppoe();
5131 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5132 }
5133 initudp();
5134 initrad();
5135 initippool();
5136
5137 // seed prng
5138 {
5139 unsigned seed = time_now ^ getpid();
5140 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5141 srand(seed);
5142 }
5143
5144 signal(SIGHUP, sighup_handler);
5145 signal(SIGCHLD, sigchild_handler);
5146 signal(SIGTERM, shutdown_handler);
5147 signal(SIGINT, shutdown_handler);
5148 signal(SIGQUIT, shutdown_handler);
5149
5150 // Prevent us from getting paged out
5151 if (config->lock_pages)
5152 {
5153 if (!mlockall(MCL_CURRENT))
5154 LOG(1, 0, 0, "Locking pages into memory\n");
5155 else
5156 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5157 }
5158
5159 mainloop();
5160
5161 /* remove plugins (so cleanup code gets run) */
5162 plugins_done();
5163
5164 // Remove the PID file if we wrote it
5165 if (config->wrote_pid && *config->pid_file == '/')
5166 unlink(config->pid_file);
5167
5168 /* kill CLI children */
5169 signal(SIGTERM, SIG_IGN);
5170 kill(0, SIGTERM);
5171 return 0;
5172 }
5173
5174 static void sighup_handler(int sig)
5175 {
5176 main_reload++;
5177 }
5178
5179 static void shutdown_handler(int sig)
5180 {
5181 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5182 }
5183
5184 static void sigchild_handler(int sig)
5185 {
5186 while (waitpid(-1, NULL, WNOHANG) > 0)
5187 ;
5188 }
5189
5190 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5191 {
5192 MD5_CTX ctx;
5193 *challenge_response = NULL;
5194
5195 if (!*config->l2tp_secret)
5196 {
5197 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5198 return;
5199 }
5200
5201 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5202
5203 *challenge_response = calloc(17, 1);
5204
5205 MD5_Init(&ctx);
5206 MD5_Update(&ctx, &id, 1);
5207 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5208 MD5_Update(&ctx, challenge, challenge_length);
5209 MD5_Final(*challenge_response, &ctx);
5210
5211 return;
5212 }
5213
5214 static int facility_value(char *name)
5215 {
5216 int i;
5217 for (i = 0; facilitynames[i].c_name; i++)
5218 {
5219 if (strcmp(facilitynames[i].c_name, name) == 0)
5220 return facilitynames[i].c_val;
5221 }
5222 return 0;
5223 }
5224
5225 static void update_config()
5226 {
5227 int i;
5228 char *p;
5229 static int timeout = 0;
5230 static int interval = 0;
5231
5232 // Update logging
5233 closelog();
5234 syslog_log = 0;
5235 if (log_stream)
5236 {
5237 if (log_stream != stderr)
5238 fclose(log_stream);
5239
5240 log_stream = NULL;
5241 }
5242
5243 if (*config->log_filename)
5244 {
5245 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5246 {
5247 char *p = config->log_filename + 7;
5248 if (*p)
5249 {
5250 openlog("l2tpns", LOG_PID, facility_value(p));
5251 syslog_log = 1;
5252 }
5253 }
5254 else if (strchr(config->log_filename, '/') == config->log_filename)
5255 {
5256 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5257 {
5258 fseek(log_stream, 0, SEEK_END);
5259 setbuf(log_stream, NULL);
5260 }
5261 else
5262 {
5263 log_stream = stderr;
5264 setbuf(log_stream, NULL);
5265 }
5266 }
5267 }
5268 else
5269 {
5270 log_stream = stderr;
5271 setbuf(log_stream, NULL);
5272 }
5273
5274 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5275 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5276
5277 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5278 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5279 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5280
5281 // reset MRU/MSS globals
5282 MRU = config->l2tp_mtu - L2TP_HDRS;
5283 if (MRU > PPPoE_MRU)
5284 MRU = PPPoE_MRU;
5285
5286 MSS = MRU - TCP_HDRS;
5287
5288 // Update radius
5289 config->numradiusservers = 0;
5290 for (i = 0; i < MAXRADSERVER; i++)
5291 if (config->radiusserver[i])
5292 {
5293 config->numradiusservers++;
5294 // Set radius port: if not set, take the port from the
5295 // first radius server. For the first radius server,
5296 // take the #defined default value from l2tpns.h
5297
5298 // test twice, In case someone works with
5299 // a secondary radius server without defining
5300 // a primary one, this will work even then.
5301 if (i > 0 && !config->radiusport[i])
5302 config->radiusport[i] = config->radiusport[i-1];
5303 if (!config->radiusport[i])
5304 config->radiusport[i] = RADPORT;
5305 }
5306
5307 if (!config->numradiusservers)
5308 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5309
5310 // parse radius_authtypes_s
5311 config->radius_authtypes = config->radius_authprefer = 0;
5312 p = config->radius_authtypes_s;
5313 while (p && *p)
5314 {
5315 char *s = strpbrk(p, " \t,");
5316 int type = 0;
5317
5318 if (s)
5319 {
5320 *s++ = 0;
5321 while (*s == ' ' || *s == '\t')
5322 s++;
5323
5324 if (!*s)
5325 s = 0;
5326 }
5327
5328 if (!strncasecmp("chap", p, strlen(p)))
5329 type = AUTHCHAP;
5330 else if (!strncasecmp("pap", p, strlen(p)))
5331 type = AUTHPAP;
5332 else
5333 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5334
5335 config->radius_authtypes |= type;
5336 if (!config->radius_authprefer)
5337 config->radius_authprefer = type;
5338
5339 p = s;
5340 }
5341
5342 if (!config->radius_authtypes)
5343 {
5344 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5345 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5346 }
5347
5348 // normalise radius_authtypes_s
5349 if (config->radius_authprefer == AUTHPAP)
5350 {
5351 strcpy(config->radius_authtypes_s, "pap");
5352 if (config->radius_authtypes & AUTHCHAP)
5353 strcat(config->radius_authtypes_s, ", chap");
5354 }
5355 else
5356 {
5357 strcpy(config->radius_authtypes_s, "chap");
5358 if (config->radius_authtypes & AUTHPAP)
5359 strcat(config->radius_authtypes_s, ", pap");
5360 }
5361
5362 if (!config->radius_dae_port)
5363 config->radius_dae_port = DAEPORT;
5364
5365 #ifdef LAC
5366 if(!config->bind_portremotelns)
5367 config->bind_portremotelns = L2TPLACPORT;
5368 if(!config->bind_address_remotelns)
5369 config->bind_address_remotelns = INADDR_ANY;
5370 #endif
5371 if(!config->iftun_address)
5372 config->iftun_address = config->bind_address;
5373
5374 if (!*config->pppoe_ac_name)
5375 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5376
5377 // re-initialise the random number source
5378 initrandom(config->random_device);
5379
5380 // Update plugins
5381 for (i = 0; i < MAXPLUGINS; i++)
5382 {
5383 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5384 continue;
5385
5386 if (*config->plugins[i])
5387 {
5388 // Plugin added
5389 add_plugin(config->plugins[i]);
5390 }
5391 else if (*config->old_plugins[i])
5392 {
5393 // Plugin removed
5394 remove_plugin(config->old_plugins[i]);
5395 }
5396 }
5397
5398 // Guest change
5399 guest_accounts_num = 0;
5400 char *p2 = config->guest_user;
5401 while (p2 && *p2)
5402 {
5403 char *s = strpbrk(p2, " \t,");
5404 if (s)
5405 {
5406 *s++ = 0;
5407 while (*s == ' ' || *s == '\t')
5408 s++;
5409
5410 if (!*s)
5411 s = 0;
5412 }
5413
5414 strcpy(guest_users[guest_accounts_num], p2);
5415 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5416 guest_accounts_num++;
5417 p2 = s;
5418 }
5419 // Rebuild the guest_user array
5420 strcpy(config->guest_user, "");
5421 int ui = 0;
5422 for (ui=0; ui<guest_accounts_num; ui++)
5423 {
5424 strcat(config->guest_user, guest_users[ui]);
5425 if (ui<guest_accounts_num-1)
5426 {
5427 strcat(config->guest_user, ",");
5428 }
5429 }
5430
5431
5432 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5433 if (!config->multi_read_count) config->multi_read_count = 10;
5434 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5435 if (!*config->cluster_interface)
5436 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5437
5438 if (!config->cluster_hb_interval)
5439 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5440
5441 if (!config->cluster_hb_timeout)
5442 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5443
5444 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5445 {
5446 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5447 // late, ensure we're sufficiently larger than that
5448 int t = 4 * config->cluster_hb_interval + 11;
5449
5450 if (config->cluster_hb_timeout < t)
5451 {
5452 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5453 config->cluster_hb_timeout = t;
5454 }
5455
5456 // Push timing changes to the slaves immediately if we're the master
5457 if (config->cluster_iam_master)
5458 cluster_heartbeat();
5459
5460 interval = config->cluster_hb_interval;
5461 timeout = config->cluster_hb_timeout;
5462 }
5463
5464 // Write PID file
5465 if (*config->pid_file == '/' && !config->wrote_pid)
5466 {
5467 FILE *f;
5468 if ((f = fopen(config->pid_file, "w")))
5469 {
5470 fprintf(f, "%d\n", getpid());
5471 fclose(f);
5472 config->wrote_pid = 1;
5473 }
5474 else
5475 {
5476 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5477 }
5478 }
5479 }
5480
5481 static void read_config_file()
5482 {
5483 FILE *f;
5484
5485 if (!config->config_file) return;
5486 if (!(f = fopen(config->config_file, "r")))
5487 {
5488 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5489 return;
5490 }
5491
5492 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5493 cli_do_file(f);
5494 LOG(3, 0, 0, "Done reading config file\n");
5495 fclose(f);
5496 }
5497
5498 int sessionsetup(sessionidt s, tunnelidt t)
5499 {
5500 // A session now exists, set it up
5501 in_addr_t ip;
5502 char *user;
5503 sessionidt i;
5504 int r;
5505
5506 CSTAT(sessionsetup);
5507
5508 LOG(3, s, t, "Doing session setup for session\n");
5509
5510 // Join a bundle if the MRRU option is accepted
5511 if(session[s].mrru > 0 && session[s].bundle == 0)
5512 {
5513 LOG(3, s, t, "This session can be part of multilink bundle\n");
5514 if (join_bundle(s) > 0)
5515 cluster_send_bundle(session[s].bundle);
5516 else
5517 {
5518 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5519 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5520 return 0;
5521 }
5522 }
5523
5524 if (!session[s].ip)
5525 {
5526 assign_ip_address(s);
5527 if (!session[s].ip)
5528 {
5529 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5530 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5531 return 0;
5532 }
5533 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5534 fmtaddr(htonl(session[s].ip), 0));
5535 }
5536
5537 // Make sure this is right
5538 session[s].tunnel = t;
5539
5540 // zap old sessions with same IP and/or username
5541 // Don't kill gardened sessions - doing so leads to a DoS
5542 // from someone who doesn't need to know the password
5543 {
5544 ip = session[s].ip;
5545 user = session[s].user;
5546 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5547 {
5548 if (i == s) continue;
5549 if (!session[s].opened) break;
5550 // Allow duplicate sessions for multilink ones of the same bundle.
5551 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5552
5553 if (ip == session[i].ip)
5554 {
5555 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5556 continue;
5557 }
5558
5559 if (config->allow_duplicate_users) continue;
5560 if (session[s].walled_garden || session[i].walled_garden) continue;
5561 // Guest change
5562 int found = 0;
5563 int gu;
5564 for (gu = 0; gu < guest_accounts_num; gu++)
5565 {
5566 if (!strcasecmp(user, guest_users[gu]))
5567 {
5568 found = 1;
5569 break;
5570 }
5571 }
5572 if (found) continue;
5573
5574 // Drop the new session in case of duplicate sessionss, not the old one.
5575 if (!strcasecmp(user, session[i].user))
5576 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5577 }
5578 }
5579
5580 // no need to set a route for the same IP address of the bundle
5581 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5582 {
5583 int routed = 0;
5584
5585 // Add the route for this session.
5586 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5587 {
5588 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5589 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5590 routed++;
5591
5592 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5593 }
5594
5595 // Static IPs need to be routed if not already
5596 // convered by a Framed-Route. Anything else is part
5597 // of the IP address pool and is already routed, it
5598 // just needs to be added to the IP cache.
5599 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5600 if (session[s].ip_pool_index == -1) // static ip
5601 {
5602 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5603 }
5604 else
5605 cache_ipmap(session[s].ip, s);
5606 }
5607
5608 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5609 lcp_open(s, t); // transition to Network phase and send initial IPCP
5610
5611 // Run the plugin's against this new session.
5612 {
5613 struct param_new_session data = { &tunnel[t], &session[s] };
5614 run_plugins(PLUGIN_NEW_SESSION, &data);
5615 }
5616
5617 // Allocate TBFs if throttled
5618 if (session[s].throttle_in || session[s].throttle_out)
5619 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5620
5621 session[s].last_packet = session[s].last_data = time_now;
5622
5623 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5624 fmtaddr(htonl(session[s].ip), 0),
5625 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5626
5627 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5628
5629 return 1; // RADIUS OK and IP allocated, done...
5630 }
5631
5632 //
5633 // This session just got dropped on us by the master or something.
5634 // Make sure our tables up up to date...
5635 //
5636 int load_session(sessionidt s, sessiont *new)
5637 {
5638 int i;
5639 int newip = 0;
5640
5641 // Sanity checks.
5642 if (new->ip_pool_index >= MAXIPPOOL ||
5643 new->tunnel >= MAXTUNNEL)
5644 {
5645 LOG(0, s, 0, "Strange session update received!\n");
5646 // FIXME! What to do here?
5647 return 0;
5648 }
5649
5650 //
5651 // Ok. All sanity checks passed. Now we're committed to
5652 // loading the new session.
5653 //
5654
5655 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5656
5657 // See if routes/ip cache need updating
5658 if (new->ip != session[s].ip)
5659 newip++;
5660
5661 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5662 if (new->route[i].ip != session[s].route[i].ip ||
5663 new->route[i].prefixlen != session[s].route[i].prefixlen)
5664 newip++;
5665
5666 // needs update
5667 if (newip)
5668 {
5669 int routed = 0;
5670
5671 // remove old routes...
5672 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5673 {
5674 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5675 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5676 routed++;
5677
5678 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5679 }
5680
5681 // ...ip
5682 if (session[s].ip)
5683 {
5684 if (session[s].ip_pool_index == -1) // static IP
5685 {
5686 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5687 }
5688 else // It's part of the IP pool, remove it manually.
5689 uncache_ipmap(session[s].ip);
5690 }
5691
5692 routed = 0;
5693
5694 // add new routes...
5695 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5696 {
5697 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5698 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5699 routed++;
5700
5701 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5702 }
5703
5704 // ...ip
5705 if (new->ip)
5706 {
5707 // If there's a new one, add it.
5708 if (new->ip_pool_index == -1)
5709 {
5710 if (!routed) routeset(s, new->ip, 0, 0, 1);
5711 }
5712 else
5713 cache_ipmap(new->ip, s);
5714 }
5715 }
5716
5717 // check v6 routing
5718 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5719 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5720
5721 // check filters
5722 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5723 {
5724 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5725 new->filter_in = 0;
5726 }
5727
5728 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5729 {
5730 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5731 new->filter_out = 0;
5732 }
5733
5734 if (new->filter_in != session[s].filter_in)
5735 {
5736 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5737 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5738 }
5739
5740 if (new->filter_out != session[s].filter_out)
5741 {
5742 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5743 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5744 }
5745
5746 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5747 // for walking the sessions to forward byte counts to the master.
5748 config->cluster_highest_sessionid = s;
5749
5750 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5751
5752 // Do fixups into address pool.
5753 if (new->ip_pool_index != -1)
5754 fix_address_pool(s);
5755
5756 return 1;
5757 }
5758
5759 static void initplugins()
5760 {
5761 int i;
5762
5763 loaded_plugins = ll_init();
5764 // Initialize the plugins to nothing
5765 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5766 plugins[i] = ll_init();
5767 }
5768
5769 static void *open_plugin(char *plugin_name, int load)
5770 {
5771 char path[256] = "";
5772
5773 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5774 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5775 return dlopen(path, RTLD_NOW);
5776 }
5777
5778 // plugin callback to get a config value
5779 static void *getconfig(char *key, enum config_typet type)
5780 {
5781 int i;
5782
5783 for (i = 0; config_values[i].key; i++)
5784 {
5785 if (!strcmp(config_values[i].key, key))
5786 {
5787 if (config_values[i].type == type)
5788 return ((void *) config) + config_values[i].offset;
5789
5790 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5791 key, type, config_values[i].type);
5792
5793 return 0;
5794 }
5795 }
5796
5797 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5798 return 0;
5799 }
5800
5801 static int add_plugin(char *plugin_name)
5802 {
5803 static struct pluginfuncs funcs = {
5804 _log,
5805 _log_hex,
5806 fmtaddr,
5807 sessionbyuser,
5808 sessiontbysessionidt,
5809 sessionidtbysessiont,
5810 radiusnew,
5811 radiussend,
5812 getconfig,
5813 sessionshutdown,
5814 sessionkill,
5815 throttle_session,
5816 cluster_send_session,
5817 };
5818
5819 void *p = open_plugin(plugin_name, 1);
5820 int (*initfunc)(struct pluginfuncs *);
5821 int i;
5822
5823 if (!p)
5824 {
5825 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5826 return -1;
5827 }
5828
5829 if (ll_contains(loaded_plugins, p))
5830 {
5831 dlclose(p);
5832 return 0; // already loaded
5833 }
5834
5835 {
5836 int *v = dlsym(p, "plugin_api_version");
5837 if (!v || *v != PLUGIN_API_VERSION)
5838 {
5839 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5840 dlclose(p);
5841 return -1;
5842 }
5843 }
5844
5845 if ((initfunc = dlsym(p, "plugin_init")))
5846 {
5847 if (!initfunc(&funcs))
5848 {
5849 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5850 dlclose(p);
5851 return -1;
5852 }
5853 }
5854
5855 ll_push(loaded_plugins, p);
5856
5857 for (i = 0; i < max_plugin_functions; i++)
5858 {
5859 void *x;
5860 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5861 {
5862 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5863 ll_push(plugins[i], x);
5864 }
5865 }
5866
5867 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5868 return 1;
5869 }
5870
5871 static void run_plugin_done(void *plugin)
5872 {
5873 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5874
5875 if (donefunc)
5876 donefunc();
5877 }
5878
5879 static int remove_plugin(char *plugin_name)
5880 {
5881 void *p = open_plugin(plugin_name, 0);
5882 int loaded = 0;
5883
5884 if (!p)
5885 return -1;
5886
5887 if (ll_contains(loaded_plugins, p))
5888 {
5889 int i;
5890 for (i = 0; i < max_plugin_functions; i++)
5891 {
5892 void *x;
5893 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5894 ll_delete(plugins[i], x);
5895 }
5896
5897 ll_delete(loaded_plugins, p);
5898 run_plugin_done(p);
5899 loaded = 1;
5900 }
5901
5902 dlclose(p);
5903 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5904 return loaded;
5905 }
5906
5907 int run_plugins(int plugin_type, void *data)
5908 {
5909 int (*func)(void *data);
5910
5911 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5912 return PLUGIN_RET_ERROR;
5913
5914 ll_reset(plugins[plugin_type]);
5915 while ((func = ll_next(plugins[plugin_type])))
5916 {
5917 int r = func(data);
5918
5919 if (r != PLUGIN_RET_OK)
5920 return r; // stop here
5921 }
5922
5923 return PLUGIN_RET_OK;
5924 }
5925
5926 static void plugins_done()
5927 {
5928 void *p;
5929
5930 ll_reset(loaded_plugins);
5931 while ((p = ll_next(loaded_plugins)))
5932 run_plugin_done(p);
5933 }
5934
5935 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5936 {
5937 struct nsctl request;
5938 struct nsctl response;
5939 int type = unpack_control(&request, buf, len);
5940 int r;
5941 void *p;
5942
5943 if (log_stream && config->debug >= 4)
5944 {
5945 if (type < 0)
5946 {
5947 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5948 fmtaddr(addr->sin_addr.s_addr, 0), type);
5949 }
5950 else
5951 {
5952 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5953 dump_control(&request, log_stream);
5954 }
5955 }
5956
5957 switch (type)
5958 {
5959 case NSCTL_REQ_LOAD:
5960 if (request.argc != 1)
5961 {
5962 response.type = NSCTL_RES_ERR;
5963 response.argc = 1;
5964 response.argv[0] = "name of plugin required";
5965 }
5966 else if ((r = add_plugin(request.argv[0])) < 1)
5967 {
5968 response.type = NSCTL_RES_ERR;
5969 response.argc = 1;
5970 response.argv[0] = !r
5971 ? "plugin already loaded"
5972 : "error loading plugin";
5973 }
5974 else
5975 {
5976 response.type = NSCTL_RES_OK;
5977 response.argc = 0;
5978 }
5979
5980 break;
5981
5982 case NSCTL_REQ_UNLOAD:
5983 if (request.argc != 1)
5984 {
5985 response.type = NSCTL_RES_ERR;
5986 response.argc = 1;
5987 response.argv[0] = "name of plugin required";
5988 }
5989 else if ((r = remove_plugin(request.argv[0])) < 1)
5990 {
5991 response.type = NSCTL_RES_ERR;
5992 response.argc = 1;
5993 response.argv[0] = !r
5994 ? "plugin not loaded"
5995 : "plugin not found";
5996 }
5997 else
5998 {
5999 response.type = NSCTL_RES_OK;
6000 response.argc = 0;
6001 }
6002
6003 break;
6004
6005 case NSCTL_REQ_HELP:
6006 response.type = NSCTL_RES_OK;
6007 response.argc = 0;
6008
6009 ll_reset(loaded_plugins);
6010 while ((p = ll_next(loaded_plugins)))
6011 {
6012 char **help = dlsym(p, "plugin_control_help");
6013 while (response.argc < 0xff && help && *help)
6014 response.argv[response.argc++] = *help++;
6015 }
6016
6017 break;
6018
6019 case NSCTL_REQ_CONTROL:
6020 {
6021 struct param_control param = {
6022 config->cluster_iam_master,
6023 request.argc,
6024 request.argv,
6025 0,
6026 NULL,
6027 };
6028
6029 int r = run_plugins(PLUGIN_CONTROL, &param);
6030
6031 if (r == PLUGIN_RET_ERROR)
6032 {
6033 response.type = NSCTL_RES_ERR;
6034 response.argc = 1;
6035 response.argv[0] = param.additional
6036 ? param.additional
6037 : "error returned by plugin";
6038 }
6039 else if (r == PLUGIN_RET_NOTMASTER)
6040 {
6041 static char msg[] = "must be run on master: 000.000.000.000";
6042
6043 response.type = NSCTL_RES_ERR;
6044 response.argc = 1;
6045 if (config->cluster_master_address)
6046 {
6047 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6048 response.argv[0] = msg;
6049 }
6050 else
6051 {
6052 response.argv[0] = "must be run on master: none elected";
6053 }
6054 }
6055 else if (!(param.response & NSCTL_RESPONSE))
6056 {
6057 response.type = NSCTL_RES_ERR;
6058 response.argc = 1;
6059 response.argv[0] = param.response
6060 ? "unrecognised response value from plugin"
6061 : "unhandled action";
6062 }
6063 else
6064 {
6065 response.type = param.response;
6066 response.argc = 0;
6067 if (param.additional)
6068 {
6069 response.argc = 1;
6070 response.argv[0] = param.additional;
6071 }
6072 }
6073 }
6074
6075 break;
6076
6077 default:
6078 response.type = NSCTL_RES_ERR;
6079 response.argc = 1;
6080 response.argv[0] = "error unpacking control packet";
6081 }
6082
6083 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6084 if (!buf)
6085 {
6086 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6087 return;
6088 }
6089
6090 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6091 if (r > 0)
6092 {
6093 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6094 if (log_stream && config->debug >= 4)
6095 {
6096 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6097 dump_control(&response, log_stream);
6098 }
6099 }
6100 else
6101 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6102 fmtaddr(addr->sin_addr.s_addr, 0), r);
6103
6104 free(buf);
6105 }
6106
6107 static tunnelidt new_tunnel()
6108 {
6109 tunnelidt i;
6110 for (i = 1; i < MAXTUNNEL; i++)
6111 {
6112 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6113 {
6114 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6115 if (i > config->cluster_highest_tunnelid)
6116 config->cluster_highest_tunnelid = i;
6117 return i;
6118 }
6119 }
6120 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6121 return 0;
6122 }
6123
6124 //
6125 // We're becoming the master. Do any required setup..
6126 //
6127 // This is principally telling all the plugins that we're
6128 // now a master, and telling them about all the sessions
6129 // that are active too..
6130 //
6131 void become_master(void)
6132 {
6133 int s, i;
6134 static struct event_data d[RADIUS_FDS];
6135 struct epoll_event e;
6136
6137 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6138
6139 // running a bunch of iptables commands is slow and can cause
6140 // the master to drop tunnels on takeover--kludge around the
6141 // problem by forking for the moment (note: race)
6142 if (!fork_and_close())
6143 {
6144 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6145 {
6146 if (!session[s].opened) // Not an in-use session.
6147 continue;
6148
6149 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6150 }
6151 exit(0);
6152 }
6153
6154 // add radius fds
6155 e.events = EPOLLIN;
6156 for (i = 0; i < RADIUS_FDS; i++)
6157 {
6158 d[i].type = FD_TYPE_RADIUS;
6159 d[i].index = i;
6160 e.data.ptr = &d[i];
6161
6162 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6163 }
6164 }
6165
6166 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6167 {
6168 int s, i;
6169 int count = 0;
6170 int buckets[64];
6171
6172 if (CLI_HELP_REQUESTED)
6173 return CLI_HELP_NO_ARGS;
6174
6175 time(&time_now);
6176 for (i = 0; i < 64;++i) buckets[i] = 0;
6177
6178 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6179 {
6180 int idle;
6181 if (!session[s].opened)
6182 continue;
6183
6184 idle = time_now - session[s].last_data;
6185 idle /= 5 ; // In multiples of 5 seconds.
6186 if (idle < 0)
6187 idle = 0;
6188 if (idle > 63)
6189 idle = 63;
6190
6191 ++count;
6192 ++buckets[idle];
6193 }
6194
6195 for (i = 0; i < 63; ++i)
6196 {
6197 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6198 }
6199 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6200 cli_print(cli, "%d total sessions open.", count);
6201 return CLI_OK;
6202 }
6203
6204 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6205 {
6206 int s, i;
6207 int count = 0;
6208 int buckets[64];
6209
6210 if (CLI_HELP_REQUESTED)
6211 return CLI_HELP_NO_ARGS;
6212
6213 time(&time_now);
6214 for (i = 0; i < 64;++i) buckets[i] = 0;
6215
6216 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6217 {
6218 int open = 0, d;
6219 if (!session[s].opened)
6220 continue;
6221
6222 d = time_now - session[s].opened;
6223 if (d < 0)
6224 d = 0;
6225 while (d > 1 && open < 32)
6226 {
6227 ++open;
6228 d >>= 1; // half.
6229 }
6230 ++count;
6231 ++buckets[open];
6232 }
6233
6234 s = 1;
6235 for (i = 0; i < 30; ++i)
6236 {
6237 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6238 s <<= 1;
6239 }
6240 cli_print(cli, "%d total sessions open.", count);
6241 return CLI_OK;
6242 }
6243
6244 /* Unhide an avp.
6245 *
6246 * This unencodes the AVP using the L2TP secret and the previously
6247 * stored random vector. It overwrites the hidden data with the
6248 * unhidden AVP subformat.
6249 */
6250 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6251 {
6252 MD5_CTX ctx;
6253 uint8_t digest[16];
6254 uint8_t *last;
6255 size_t d = 0;
6256 uint16_t m = htons(type);
6257
6258 // Compute initial pad
6259 MD5_Init(&ctx);
6260 MD5_Update(&ctx, (unsigned char *) &m, 2);
6261 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6262 MD5_Update(&ctx, vector, vec_len);
6263 MD5_Final(digest, &ctx);
6264
6265 // pointer to last decoded 16 octets
6266 last = value;
6267
6268 while (len > 0)
6269 {
6270 // calculate a new pad based on the last decoded block
6271 if (d >= sizeof(digest))
6272 {
6273 MD5_Init(&ctx);
6274 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6275 MD5_Update(&ctx, last, sizeof(digest));
6276 MD5_Final(digest, &ctx);
6277
6278 d = 0;
6279 last = value;
6280 }
6281
6282 *value++ ^= digest[d++];
6283 len--;
6284 }
6285 }
6286
6287 int find_filter(char const *name, size_t len)
6288 {
6289 int free = -1;
6290 int i;
6291
6292 for (i = 0; i < MAXFILTER; i++)
6293 {
6294 if (!*ip_filters[i].name)
6295 {
6296 if (free < 0)
6297 free = i;
6298
6299 continue;
6300 }
6301
6302 if (strlen(ip_filters[i].name) != len)
6303 continue;
6304
6305 if (!strncmp(ip_filters[i].name, name, len))
6306 return i;
6307 }
6308
6309 return free;
6310 }
6311
6312 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6313 {
6314 switch (p->op)
6315 {
6316 case FILTER_PORT_OP_EQ: return port == p->port;
6317 case FILTER_PORT_OP_NEQ: return port != p->port;
6318 case FILTER_PORT_OP_GT: return port > p->port;
6319 case FILTER_PORT_OP_LT: return port < p->port;
6320 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6321 }
6322
6323 return 0;
6324 }
6325
6326 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6327 {
6328 switch (op)
6329 {
6330 case FILTER_FLAG_OP_ANY:
6331 return (flags & sflags) || (~flags & cflags);
6332
6333 case FILTER_FLAG_OP_ALL:
6334 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6335
6336 case FILTER_FLAG_OP_EST:
6337 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6338 }
6339
6340 return 0;
6341 }
6342
6343 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6344 {
6345 uint16_t frag_offset;
6346 uint8_t proto;
6347 in_addr_t src_ip;
6348 in_addr_t dst_ip;
6349 uint16_t src_port = 0;
6350 uint16_t dst_port = 0;
6351 uint8_t flags = 0;
6352 ip_filter_rulet *rule;
6353
6354 if (len < 20) // up to end of destination address
6355 return 0;
6356
6357 if ((*buf >> 4) != 4) // IPv4
6358 return 0;
6359
6360 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6361 proto = buf[9];
6362 src_ip = *(in_addr_t *) (buf + 12);
6363 dst_ip = *(in_addr_t *) (buf + 16);
6364
6365 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6366 {
6367 int l = (buf[0] & 0xf) * 4; // length of IP header
6368 if (len < l + 4) // ports
6369 return 0;
6370
6371 src_port = ntohs(*(uint16_t *) (buf + l));
6372 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6373 if (proto == IPPROTO_TCP)
6374 {
6375 if (len < l + 14) // flags
6376 return 0;
6377
6378 flags = buf[l + 13] & 0x3f;
6379 }
6380 }
6381
6382 for (rule = ip_filters[filter].rules; rule->action; rule++)
6383 {
6384 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6385 continue;
6386
6387 if (rule->src_wild != INADDR_BROADCAST &&
6388 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6389 continue;
6390
6391 if (rule->dst_wild != INADDR_BROADCAST &&
6392 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6393 continue;
6394
6395 if (frag_offset)
6396 {
6397 // layer 4 deny rules are skipped
6398 if (rule->action == FILTER_ACTION_DENY &&
6399 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6400 continue;
6401 }
6402 else
6403 {
6404 if (rule->frag)
6405 continue;
6406
6407 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6408 {
6409 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6410 continue;
6411
6412 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6413 continue;
6414
6415 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6416 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6417 continue;
6418 }
6419 }
6420
6421 // matched
6422 rule->counter++;
6423 return rule->action == FILTER_ACTION_PERMIT;
6424 }
6425
6426 // default deny
6427 return 0;
6428 }
6429
6430 #ifdef LAC
6431
6432 tunnelidt lac_new_tunnel()
6433 {
6434 return new_tunnel();
6435 }
6436
6437 void lac_tunnelclear(tunnelidt t)
6438 {
6439 tunnelclear(t);
6440 }
6441
6442 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6443 {
6444 uint16_t version = 0x0100; // protocol version
6445
6446 tunnel[t].state = TUNNELOPENING;
6447
6448 // Sent SCCRQ - Start Control Connection Request
6449 controlt *c = controlnew(1); // sending SCCRQ
6450 controls(c, 7, hostname, 1); // host name
6451 controls(c, 8, Vendor_name, 1); // Vendor name
6452 control16(c, 2, version, 1); // protocol version
6453 control32(c, 3, 3, 1); // framing Capabilities
6454 control16(c, 9, t, 1); // assigned tunnel
6455 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6456 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6457 controladd(c, 0, t); // send
6458 }
6459
6460 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6461 {
6462 // Sent ICRQ Incoming-call-request
6463 controlt *c = controlnew(10); // ICRQ
6464
6465 control16(c, 14, s, 1); // assigned sesion
6466 call_serial_number++;
6467 control32(c, 15, call_serial_number, 1); // call serial number
6468 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6469 controladd(c, 0, t); // send
6470 }
6471
6472 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6473 {
6474 tunnelshutdown(t, reason, result, error, msg);
6475 }
6476
6477 #endif