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