527175c278d6767231f3353e72b09ab798bd2bff
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 #include <arpa/inet.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <linux/if_tun.h>
12 #define SYSLOG_NAMES
13 #include <syslog.h>
14 #include <malloc.h>
15 #include <net/route.h>
16 #include <sys/mman.h>
17 #include <netdb.h>
18 #include <netinet/in.h>
19 #include <netinet/ip6.h>
20 #include <stdarg.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/wait.h>
31 #include <net/if.h>
32 #include <stddef.h>
33 #include <time.h>
34 #include <dlfcn.h>
35 #include <unistd.h>
36 #include <sched.h>
37 #include <sys/sysinfo.h>
38 #include <libcli.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
41
42 #include "md5.h"
43 #include "l2tpns.h"
44 #include "cluster.h"
45 #include "plugin.h"
46 #include "ll.h"
47 #include "constants.h"
48 #include "control.h"
49 #include "util.h"
50 #include "tbf.h"
51
52 #ifdef BGP
53 #include "bgp.h"
54 #endif
55
56 #ifdef LAC
57 #include "l2tplac.h"
58 #endif
59 #include "pppoe.h"
60
61 #ifdef LAC
62 char * Vendor_name = "Linux L2TPNS";
63 uint32_t call_serial_number = 0;
64 #endif
65
66 // Globals
67 configt *config = NULL; // all configuration
68 int nlfd = -1; // netlink socket
69 int tunfd = -1; // tun interface file handle. (network device)
70 int udpfd = -1; // UDP file handle
71 #ifdef LAC
72 int udplacfd = -1; // UDP LAC file handle
73 #endif
74 int controlfd = -1; // Control signal handle
75 int clifd = -1; // Socket listening for CLI connections.
76 int daefd = -1; // Socket listening for DAE connections.
77 int snoopfd = -1; // UDP file handle for sending out intercept data
78 int *radfds = NULL; // RADIUS requests file handles
79 int rand_fd = -1; // Random data source
80 int cluster_sockfd = -1; // Intra-cluster communications socket.
81 int epollfd = -1; // event polling
82 time_t basetime = 0; // base clock
83 char hostname[MAXHOSTNAME] = ""; // us.
84 static int tunidx; // ifr_ifindex of tun device
85 int nlseqnum = 0; // netlink sequence number
86 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
87 static int syslog_log = 0; // are we logging to syslog
88 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
89 uint32_t last_id = 0; // Unique ID for radius accounting
90 // Guest change
91 char guest_users[10][32]; // Array of guest users
92 int guest_accounts_num = 0; // Number of guest users
93
94 // calculated from config->l2tp_mtu
95 uint16_t MRU = 0; // PPP MRU
96 uint16_t MSS = 0; // TCP MSS
97
98 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
99 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
100
101 union iphash {
102 sessionidt sess;
103 union iphash *idx;
104 } ip_hash[256]; // Mapping from IP address to session structures.
105
106 struct ipv6radix {
107 sessionidt sess;
108 struct ipv6radix *branch;
109 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
110
111 // Traffic counters.
112 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
113 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
114 uint32_t eth_tx = 0;
115
116 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
117 time_t time_now = 0; // Current time in seconds since epoch.
118 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
119 static char time_now_string[64] = {0}; // Current time as a string.
120 static int time_changed = 0; // time_now changed
121 char main_quit = 0; // True if we're in the process of exiting.
122 static char main_reload = 0; // Re-load pending
123 linked_list *loaded_plugins;
124 linked_list *plugins[MAX_PLUGIN_TYPES];
125
126 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
127 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
128
129 config_descriptt config_values[] = {
130 CONFIG("debug", debug, INT),
131 CONFIG("log_file", log_filename, STRING),
132 CONFIG("pid_file", pid_file, STRING),
133 CONFIG("random_device", random_device, STRING),
134 CONFIG("l2tp_secret", l2tp_secret, STRING),
135 CONFIG("l2tp_mtu", l2tp_mtu, INT),
136 CONFIG("ppp_restart_time", ppp_restart_time, INT),
137 CONFIG("ppp_max_configure", ppp_max_configure, INT),
138 CONFIG("ppp_max_failure", ppp_max_failure, INT),
139 CONFIG("primary_dns", default_dns1, IPv4),
140 CONFIG("secondary_dns", default_dns2, IPv4),
141 CONFIG("primary_radius", radiusserver[0], IPv4),
142 CONFIG("secondary_radius", radiusserver[1], IPv4),
143 CONFIG("primary_radius_port", radiusport[0], SHORT),
144 CONFIG("secondary_radius_port", radiusport[1], SHORT),
145 CONFIG("radius_accounting", radius_accounting, BOOL),
146 CONFIG("radius_interim", radius_interim, INT),
147 CONFIG("radius_secret", radiussecret, STRING),
148 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
149 CONFIG("radius_dae_port", radius_dae_port, SHORT),
150 CONFIG("radius_bind_min", radius_bind_min, SHORT),
151 CONFIG("radius_bind_max", radius_bind_max, SHORT),
152 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
153 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
154 CONFIG("guest_account", guest_user, STRING),
155 CONFIG("bind_address", bind_address, IPv4),
156 CONFIG("peer_address", peer_address, IPv4),
157 CONFIG("send_garp", send_garp, BOOL),
158 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
159 CONFIG("throttle_buckets", num_tbfs, INT),
160 CONFIG("accounting_dir", accounting_dir, STRING),
161 CONFIG("dump_speed", dump_speed, BOOL),
162 CONFIG("multi_read_count", multi_read_count, INT),
163 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
164 CONFIG("lock_pages", lock_pages, BOOL),
165 CONFIG("icmp_rate", icmp_rate, INT),
166 CONFIG("packet_limit", max_packets, INT),
167 CONFIG("cluster_address", cluster_address, IPv4),
168 CONFIG("cluster_interface", cluster_interface, STRING),
169 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
170 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
171 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
172 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
173 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
174 CONFIG("cli_bind_address", cli_bind_address, IPv4),
175 CONFIG("hostname", hostname, STRING),
176 #ifdef BGP
177 CONFIG("nexthop_address", nexthop_address, IPv4),
178 CONFIG("nexthop6_address", nexthop6_address, IPv6),
179 #endif
180 CONFIG("echo_timeout", echo_timeout, INT),
181 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
182 CONFIG("iftun_address", iftun_address, IPv4),
183 CONFIG("tundevicename", tundevicename, STRING),
184 #ifdef LAC
185 CONFIG("disable_lac_func", disable_lac_func, BOOL),
186 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
187 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
188 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
189 #endif
190 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
191 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
192 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
193 CONFIG("disable_sending_hello", disable_sending_hello, BOOL),
194 CONFIG("disable_no_spoof", disable_no_spoof, BOOL),
195 { NULL, 0, 0, 0 }
196 };
197
198 static char *plugin_functions[] = {
199 NULL,
200 "plugin_pre_auth",
201 "plugin_post_auth",
202 "plugin_timer",
203 "plugin_new_session",
204 "plugin_kill_session",
205 "plugin_control",
206 "plugin_radius_response",
207 "plugin_radius_reset",
208 "plugin_radius_account",
209 "plugin_become_master",
210 "plugin_new_session_master",
211 };
212
213 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
214
215 // Counters for shutdown sessions
216 static sessiont shut_acct[8192];
217 static sessionidt shut_acct_n = 0;
218
219 tunnelt *tunnel = NULL; // Array of tunnel structures.
220 bundlet *bundle = NULL; // Array of bundle structures.
221 fragmentationt *frag = NULL; // Array of fragmentation structures.
222 sessiont *session = NULL; // Array of session structures.
223 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
224 radiust *radius = NULL; // Array of radius structures.
225 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
226 ip_filtert *ip_filters = NULL; // Array of named filters.
227 static controlt *controlfree = 0;
228 struct Tstats *_statistics = NULL;
229 #ifdef RINGBUFFER
230 struct Tringbuffer *ringbuffer = NULL;
231 #endif
232
233 static ssize_t netlink_send(struct nlmsghdr *nh);
234 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
235 static void cache_ipmap(in_addr_t ip, sessionidt s);
236 static void uncache_ipmap(in_addr_t ip);
237 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
238 static void free_ip_address(sessionidt s);
239 static void dump_acct_info(int all);
240 static void sighup_handler(int sig);
241 static void shutdown_handler(int sig);
242 static void sigchild_handler(int sig);
243 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
244 static void update_config(void);
245 static void read_config_file(void);
246 static void initplugins(void);
247 static int add_plugin(char *plugin_name);
248 static int remove_plugin(char *plugin_name);
249 static void plugins_done(void);
250 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
251 static tunnelidt new_tunnel(void);
252 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
253 static void bundleclear(bundleidt b);
254
255 // return internal time (10ths since process startup), set f if given
256 // as a side-effect sets time_now, and time_changed
257 static clockt now(double *f)
258 {
259 struct timeval t;
260 gettimeofday(&t, 0);
261 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
262 if (t.tv_sec != time_now)
263 {
264 time_now = t.tv_sec;
265 time_changed++;
266 }
267
268 // Time in milliseconds
269 // TODO FOR MLPPP DEV
270 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
271
272 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
273 }
274
275 // work out a retry time based on try number
276 // This is a straight bounded exponential backoff.
277 // Maximum re-try time is 32 seconds. (2^5).
278 clockt backoff(uint8_t try)
279 {
280 if (try > 5) try = 5; // max backoff
281 return now(NULL) + 10 * (1 << try);
282 }
283
284
285 //
286 // Log a debug message. Typically called via the LOG macro
287 //
288 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
289 {
290 static char message[65536] = {0};
291 va_list ap;
292
293 #ifdef RINGBUFFER
294 if (ringbuffer)
295 {
296 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
297 ringbuffer->tail = 0;
298 if (ringbuffer->tail == ringbuffer->head)
299 if (++ringbuffer->head >= RINGBUFFER_SIZE)
300 ringbuffer->head = 0;
301
302 ringbuffer->buffer[ringbuffer->tail].level = level;
303 ringbuffer->buffer[ringbuffer->tail].session = s;
304 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
305 va_start(ap, format);
306 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
307 va_end(ap);
308 }
309 #endif
310
311 if (config->debug < level) return;
312
313 va_start(ap, format);
314 vsnprintf(message, sizeof(message), format, ap);
315
316 if (log_stream)
317 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
318 else if (syslog_log)
319 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
320
321 va_end(ap);
322 }
323
324 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
325 {
326 int i, j;
327 const uint8_t *d = data;
328
329 if (config->debug < level) return;
330
331 // No support for _log_hex to syslog
332 if (log_stream)
333 {
334 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
335 setvbuf(log_stream, NULL, _IOFBF, 16384);
336
337 for (i = 0; i < maxsize; )
338 {
339 fprintf(log_stream, "%4X: ", i);
340 for (j = i; j < maxsize && j < (i + 16); j++)
341 {
342 fprintf(log_stream, "%02X ", d[j]);
343 if (j == i + 7)
344 fputs(": ", log_stream);
345 }
346
347 for (; j < i + 16; j++)
348 {
349 fputs(" ", log_stream);
350 if (j == i + 7)
351 fputs(": ", log_stream);
352 }
353
354 fputs(" ", log_stream);
355 for (j = i; j < maxsize && j < (i + 16); j++)
356 {
357 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
358 fputc(d[j], log_stream);
359 else
360 fputc('.', log_stream);
361
362 if (j == i + 7)
363 fputs(" ", log_stream);
364 }
365
366 i = j;
367 fputs("\n", log_stream);
368 }
369
370 fflush(log_stream);
371 setbuf(log_stream, NULL);
372 }
373 }
374
375 // update a counter, accumulating 2^32 wraps
376 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
377 {
378 uint32_t new = *counter + delta;
379 if (new < *counter)
380 (*wrap)++;
381
382 *counter = new;
383 }
384
385 // initialise the random generator
386 static void initrandom(char *source)
387 {
388 static char path[sizeof(config->random_device)] = "*undefined*";
389
390 // reinitialise only if we are forced to do so or if the config has changed
391 if (source && !strncmp(path, source, sizeof(path)))
392 return;
393
394 // close previous source, if any
395 if (rand_fd >= 0)
396 close(rand_fd);
397
398 rand_fd = -1;
399
400 if (source)
401 {
402 // register changes
403 snprintf(path, sizeof(path), "%s", source);
404
405 if (*path == '/')
406 {
407 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
408 if (rand_fd < 0)
409 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
410 path, strerror(errno));
411 }
412 }
413 }
414
415 // fill buffer with random data
416 void random_data(uint8_t *buf, int len)
417 {
418 int n = 0;
419
420 CSTAT(random_data);
421 if (rand_fd >= 0)
422 {
423 n = read(rand_fd, buf, len);
424 if (n >= len) return;
425 if (n < 0)
426 {
427 if (errno != EAGAIN)
428 {
429 LOG(0, 0, 0, "Error reading from random source: %s\n",
430 strerror(errno));
431
432 // fall back to rand()
433 initrandom(NULL);
434 }
435
436 n = 0;
437 }
438 }
439
440 // append missing data
441 while (n < len)
442 // not using the low order bits from the prng stream
443 buf[n++] = (rand() >> 4) & 0xff;
444 }
445
446 // Add a route
447 //
448 // This adds it to the routing table, advertises it
449 // via BGP if enabled, and stuffs it into the
450 // 'sessionbyip' cache.
451 //
452 // 'ip' must be in _host_ order.
453 //
454 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
455 {
456 struct {
457 struct nlmsghdr nh;
458 struct rtmsg rt;
459 char buf[32];
460 } req;
461 int i;
462 in_addr_t n_ip;
463
464 if (!prefixlen) prefixlen = 32;
465
466 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
467
468 memset(&req, 0, sizeof(req));
469
470 if (add)
471 {
472 req.nh.nlmsg_type = RTM_NEWROUTE;
473 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
474 }
475 else
476 {
477 req.nh.nlmsg_type = RTM_DELROUTE;
478 req.nh.nlmsg_flags = NLM_F_REQUEST;
479 }
480
481 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
482
483 req.rt.rtm_family = AF_INET;
484 req.rt.rtm_dst_len = prefixlen;
485 req.rt.rtm_table = RT_TABLE_MAIN;
486 req.rt.rtm_protocol = 42;
487 req.rt.rtm_scope = RT_SCOPE_LINK;
488 req.rt.rtm_type = RTN_UNICAST;
489
490 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
491 n_ip = htonl(ip);
492 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
493 if (gw)
494 {
495 n_ip = htonl(gw);
496 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
497 }
498
499 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
500 fmtaddr(htonl(ip), 0), prefixlen,
501 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
502
503 if (netlink_send(&req.nh) < 0)
504 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
505
506 #ifdef BGP
507 if (add)
508 bgp_add_route(htonl(ip), prefixlen);
509 else
510 bgp_del_route(htonl(ip), prefixlen);
511 #endif /* BGP */
512
513 // Add/Remove the IPs to the 'sessionbyip' cache.
514 // Note that we add the zero address in the case of
515 // a network route. Roll on CIDR.
516
517 // Note that 's == 0' implies this is the address pool.
518 // We still cache it here, because it will pre-fill
519 // the malloc'ed tree.
520
521 if (s)
522 {
523 if (!add) // Are we deleting a route?
524 s = 0; // Caching the session as '0' is the same as uncaching.
525
526 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
527 cache_ipmap(i, s);
528 }
529 }
530
531 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
532 {
533 struct {
534 struct nlmsghdr nh;
535 struct rtmsg rt;
536 char buf[64];
537 } req;
538 int metric;
539 char ipv6addr[INET6_ADDRSTRLEN];
540
541 if (!config->ipv6_prefix.s6_addr[0])
542 {
543 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
544 return;
545 }
546
547 memset(&req, 0, sizeof(req));
548
549 if (add)
550 {
551 req.nh.nlmsg_type = RTM_NEWROUTE;
552 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
553 }
554 else
555 {
556 req.nh.nlmsg_type = RTM_DELROUTE;
557 req.nh.nlmsg_flags = NLM_F_REQUEST;
558 }
559
560 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
561
562 req.rt.rtm_family = AF_INET6;
563 req.rt.rtm_dst_len = prefixlen;
564 req.rt.rtm_table = RT_TABLE_MAIN;
565 req.rt.rtm_protocol = 42;
566 req.rt.rtm_scope = RT_SCOPE_LINK;
567 req.rt.rtm_type = RTN_UNICAST;
568
569 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
570 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
571 metric = 1;
572 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
573
574 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
575 add ? "add" : "del",
576 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
577 prefixlen);
578
579 if (netlink_send(&req.nh) < 0)
580 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
581
582 #ifdef BGP
583 if (add)
584 bgp_add_route6(ip, prefixlen);
585 else
586 bgp_del_route6(ip, prefixlen);
587 #endif /* BGP */
588
589 if (s)
590 {
591 if (!add) // Are we deleting a route?
592 s = 0; // Caching the session as '0' is the same as uncaching.
593
594 cache_ipv6map(ip, prefixlen, s);
595 }
596
597 return;
598 }
599
600 //
601 // Set up netlink socket
602 static void initnetlink(void)
603 {
604 struct sockaddr_nl nladdr;
605
606 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
607 if (nlfd < 0)
608 {
609 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
610 exit(1);
611 }
612
613 memset(&nladdr, 0, sizeof(nladdr));
614 nladdr.nl_family = AF_NETLINK;
615 nladdr.nl_pid = getpid();
616
617 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
618 {
619 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
620 exit(1);
621 }
622 }
623
624 static ssize_t netlink_send(struct nlmsghdr *nh)
625 {
626 struct sockaddr_nl nladdr;
627 struct iovec iov;
628 struct msghdr msg;
629
630 nh->nlmsg_pid = getpid();
631 nh->nlmsg_seq = ++nlseqnum;
632
633 // set kernel address
634 memset(&nladdr, 0, sizeof(nladdr));
635 nladdr.nl_family = AF_NETLINK;
636
637 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
638 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
639
640 return sendmsg(nlfd, &msg, 0);
641 }
642
643 static ssize_t netlink_recv(void *buf, ssize_t len)
644 {
645 struct sockaddr_nl nladdr;
646 struct iovec iov;
647 struct msghdr msg;
648
649 // set kernel address
650 memset(&nladdr, 0, sizeof(nladdr));
651 nladdr.nl_family = AF_NETLINK;
652
653 iov = (struct iovec){ buf, len };
654 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
655
656 return recvmsg(nlfd, &msg, 0);
657 }
658
659 /* adapted from iproute2 */
660 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
661 {
662 int len = RTA_LENGTH(alen);
663 struct rtattr *rta;
664
665 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
666 rta->rta_type = type;
667 rta->rta_len = len;
668 memcpy(RTA_DATA(rta), data, alen);
669 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
670 }
671
672 // messages corresponding to different phases seq number
673 static char *tun_nl_phase_msg[] = {
674 "initialized",
675 "getting tun interface index",
676 "setting tun interface parameters",
677 "setting tun IPv4 address",
678 "setting tun LL IPv6 address",
679 "setting tun global IPv6 address",
680 };
681
682 //
683 // Set up TUN interface
684 static void inittun(void)
685 {
686 struct ifreq ifr;
687
688 memset(&ifr, 0, sizeof(ifr));
689 ifr.ifr_flags = IFF_TUN;
690
691 tunfd = open(TUNDEVICE, O_RDWR);
692 if (tunfd < 0)
693 { // fatal
694 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
695 exit(1);
696 }
697 {
698 int flags = fcntl(tunfd, F_GETFL, 0);
699 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
700 }
701
702 if (*config->tundevicename)
703 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
704
705 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
706 {
707 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
708 exit(1);
709 }
710 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
711 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
712
713 tunidx = if_nametoindex(config->tundevicename);
714 if (tunidx == 0)
715 {
716 LOG(0, 0, 0, "Can't get tun interface index\n");
717 exit(1);
718 }
719
720 {
721 struct {
722 // interface setting
723 struct nlmsghdr nh;
724 union {
725 struct ifinfomsg ifinfo;
726 struct ifaddrmsg ifaddr;
727 } ifmsg;
728 char rtdata[32]; // 32 should be enough
729 } req;
730 uint32_t txqlen, mtu;
731 in_addr_t ip;
732
733 memset(&req, 0, sizeof(req));
734
735 req.nh.nlmsg_type = RTM_NEWLINK;
736 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
737 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
738
739 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
740 req.ifmsg.ifinfo.ifi_index = tunidx;
741 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
742 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
743
744 /* Bump up the qlen to deal with bursts from the network */
745 txqlen = 1000;
746 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
747 /* set MTU to modem MRU */
748 mtu = MRU;
749 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
750
751 if (netlink_send(&req.nh) < 0)
752 goto senderror;
753
754 memset(&req, 0, sizeof(req));
755
756 req.nh.nlmsg_type = RTM_NEWADDR;
757 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
758 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
759
760 req.ifmsg.ifaddr.ifa_family = AF_INET;
761 req.ifmsg.ifaddr.ifa_prefixlen = 32;
762 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
763 req.ifmsg.ifaddr.ifa_index = tunidx;
764
765 if (config->iftun_address)
766 ip = config->iftun_address;
767 else
768 ip = 0x01010101; // 1.1.1.1
769 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
770
771 if (netlink_send(&req.nh) < 0)
772 goto senderror;
773
774 // Only setup IPv6 on the tun device if we have a configured prefix
775 if (config->ipv6_prefix.s6_addr[0]) {
776 struct in6_addr ip6;
777
778 memset(&req, 0, sizeof(req));
779
780 req.nh.nlmsg_type = RTM_NEWADDR;
781 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
782 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
783
784 req.ifmsg.ifaddr.ifa_family = AF_INET6;
785 req.ifmsg.ifaddr.ifa_prefixlen = 64;
786 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
787 req.ifmsg.ifaddr.ifa_index = tunidx;
788
789 // Link local address is FE80::1
790 memset(&ip6, 0, sizeof(ip6));
791 ip6.s6_addr[0] = 0xFE;
792 ip6.s6_addr[1] = 0x80;
793 ip6.s6_addr[15] = 1;
794 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
795
796 if (netlink_send(&req.nh) < 0)
797 goto senderror;
798
799 memset(&req, 0, sizeof(req));
800
801 req.nh.nlmsg_type = RTM_NEWADDR;
802 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
803 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
804
805 req.ifmsg.ifaddr.ifa_family = AF_INET6;
806 req.ifmsg.ifaddr.ifa_prefixlen = 64;
807 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
808 req.ifmsg.ifaddr.ifa_index = tunidx;
809
810 // Global address is prefix::1
811 ip6 = config->ipv6_prefix;
812 ip6.s6_addr[15] = 1;
813 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
814
815 if (netlink_send(&req.nh) < 0)
816 goto senderror;
817 }
818
819 memset(&req, 0, sizeof(req));
820
821 req.nh.nlmsg_type = NLMSG_DONE;
822 req.nh.nlmsg_len = NLMSG_LENGTH(0);
823
824 if (netlink_send(&req.nh) < 0)
825 goto senderror;
826
827 // if we get an error for seqnum < min_initok_nlseqnum,
828 // we must exit as initialization went wrong
829 if (config->ipv6_prefix.s6_addr[0])
830 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
831 else
832 min_initok_nlseqnum = 3 + 1; // idx + if + addr
833 }
834
835 return;
836
837 senderror:
838 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
839 exit(1);
840 }
841
842 // set up UDP ports
843 static void initudp(void)
844 {
845 int on = 1;
846 struct sockaddr_in addr;
847
848 // Tunnel
849 memset(&addr, 0, sizeof(addr));
850 addr.sin_family = AF_INET;
851 addr.sin_port = htons(L2TPPORT);
852 addr.sin_addr.s_addr = config->bind_address;
853 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
854 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
855 {
856 int flags = fcntl(udpfd, F_GETFL, 0);
857 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
858 }
859 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
860 {
861 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
862 exit(1);
863 }
864
865 // Control
866 memset(&addr, 0, sizeof(addr));
867 addr.sin_family = AF_INET;
868 addr.sin_port = htons(NSCTL_PORT);
869 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
870 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
871 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
872 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
873 {
874 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
875 exit(1);
876 }
877
878 // Dynamic Authorization Extensions to RADIUS
879 memset(&addr, 0, sizeof(addr));
880 addr.sin_family = AF_INET;
881 addr.sin_port = htons(config->radius_dae_port);
882 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
883 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
884 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
885 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
886 {
887 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
888 exit(1);
889 }
890
891 #ifdef LAC
892 // Tunnel to Remote LNS
893 memset(&addr, 0, sizeof(addr));
894 addr.sin_family = AF_INET;
895 addr.sin_port = htons(config->bind_portremotelns);
896 addr.sin_addr.s_addr = config->bind_address_remotelns;
897 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
898 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
899 {
900 int flags = fcntl(udplacfd, F_GETFL, 0);
901 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
902 }
903 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
904 {
905 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
906 exit(1);
907 }
908 #endif
909
910 // Intercept
911 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
912 }
913
914 //
915 // Find session by IP, < 1 for not found
916 //
917 // Confusingly enough, this 'ip' must be
918 // in _network_ order. This being the common
919 // case when looking it up from IP packet headers.
920 //
921 // We actually use this cache for two things.
922 // #1. For used IP addresses, this maps to the
923 // session ID that it's used by.
924 // #2. For un-used IP addresses, this maps to the
925 // index into the pool table that contains that
926 // IP address.
927 //
928
929 static sessionidt lookup_ipmap(in_addr_t ip)
930 {
931 uint8_t *a = (uint8_t *) &ip;
932 union iphash *h = ip_hash;
933
934 if (!(h = h[*a++].idx)) return 0;
935 if (!(h = h[*a++].idx)) return 0;
936 if (!(h = h[*a++].idx)) return 0;
937
938 return h[*a].sess;
939 }
940
941 static sessionidt lookup_ipv6map(struct in6_addr ip)
942 {
943 struct ipv6radix *curnode;
944 int i;
945 int s;
946 char ipv6addr[INET6_ADDRSTRLEN];
947
948 curnode = &ipv6_hash[ip.s6_addr[0]];
949 i = 1;
950 s = curnode->sess;
951
952 while (s == 0 && i < 15 && curnode->branch != NULL)
953 {
954 curnode = &curnode->branch[ip.s6_addr[i]];
955 s = curnode->sess;
956 i++;
957 }
958
959 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
960 inet_ntop(AF_INET6, &ip, ipv6addr,
961 INET6_ADDRSTRLEN),
962 s);
963
964 return s;
965 }
966
967 sessionidt sessionbyip(in_addr_t ip)
968 {
969 sessionidt s = lookup_ipmap(ip);
970 CSTAT(sessionbyip);
971
972 if (s > 0 && s < MAXSESSION && session[s].opened)
973 return s;
974
975 return 0;
976 }
977
978 sessionidt sessionbyipv6(struct in6_addr ip)
979 {
980 sessionidt s;
981 CSTAT(sessionbyipv6);
982
983 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
984 (ip.s6_addr[0] == 0xFE &&
985 ip.s6_addr[1] == 0x80 &&
986 ip.s6_addr16[1] == 0 &&
987 ip.s6_addr16[2] == 0 &&
988 ip.s6_addr16[3] == 0)) {
989 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
990 } else {
991 s = lookup_ipv6map(ip);
992 }
993
994 if (s > 0 && s < MAXSESSION && session[s].opened)
995 return s;
996
997 return 0;
998 }
999
1000 //
1001 // Take an IP address in HOST byte order and
1002 // add it to the sessionid by IP cache.
1003 //
1004 // (It's actually cached in network order)
1005 //
1006 static void cache_ipmap(in_addr_t ip, sessionidt s)
1007 {
1008 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1009 uint8_t *a = (uint8_t *) &nip;
1010 union iphash *h = ip_hash;
1011 int i;
1012
1013 for (i = 0; i < 3; i++)
1014 {
1015 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1016 return;
1017
1018 h = h[a[i]].idx;
1019 }
1020
1021 h[a[3]].sess = s;
1022
1023 if (s > 0)
1024 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1025
1026 else if (s == 0)
1027 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1028 // else a map to an ip pool index.
1029 }
1030
1031 static void uncache_ipmap(in_addr_t ip)
1032 {
1033 cache_ipmap(ip, 0); // Assign it to the NULL session.
1034 }
1035
1036 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1037 {
1038 int i;
1039 int bytes;
1040 struct ipv6radix *curnode;
1041 char ipv6addr[INET6_ADDRSTRLEN];
1042
1043 curnode = &ipv6_hash[ip.s6_addr[0]];
1044
1045 bytes = prefixlen >> 3;
1046 i = 1;
1047 while (i < bytes) {
1048 if (curnode->branch == NULL)
1049 {
1050 if (!(curnode->branch = calloc(256,
1051 sizeof (struct ipv6radix))))
1052 return;
1053 }
1054 curnode = &curnode->branch[ip.s6_addr[i]];
1055 i++;
1056 }
1057
1058 curnode->sess = s;
1059
1060 if (s > 0)
1061 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1062 inet_ntop(AF_INET6, &ip, ipv6addr,
1063 INET6_ADDRSTRLEN),
1064 prefixlen);
1065 else if (s == 0)
1066 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1067 inet_ntop(AF_INET6, &ip, ipv6addr,
1068 INET6_ADDRSTRLEN),
1069 prefixlen);
1070 }
1071
1072 //
1073 // CLI list to dump current ipcache.
1074 //
1075 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1076 {
1077 union iphash *d = ip_hash, *e, *f, *g;
1078 int i, j, k, l;
1079 int count = 0;
1080
1081 if (CLI_HELP_REQUESTED)
1082 return CLI_HELP_NO_ARGS;
1083
1084 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1085
1086 for (i = 0; i < 256; ++i)
1087 {
1088 if (!d[i].idx)
1089 continue;
1090
1091 e = d[i].idx;
1092 for (j = 0; j < 256; ++j)
1093 {
1094 if (!e[j].idx)
1095 continue;
1096
1097 f = e[j].idx;
1098 for (k = 0; k < 256; ++k)
1099 {
1100 if (!f[k].idx)
1101 continue;
1102
1103 g = f[k].idx;
1104 for (l = 0; l < 256; ++l)
1105 {
1106 if (!g[l].sess)
1107 continue;
1108
1109 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1110 ++count;
1111 }
1112 }
1113 }
1114 }
1115 cli_print(cli, "%d entries in cache", count);
1116 return CLI_OK;
1117 }
1118
1119
1120 // Find session by username, 0 for not found
1121 // walled garden users aren't authenticated, so the username is
1122 // reasonably useless. Ignore them to avoid incorrect actions
1123 //
1124 // This is VERY inefficent. Don't call it often. :)
1125 //
1126 sessionidt sessionbyuser(char *username)
1127 {
1128 int s;
1129 CSTAT(sessionbyuser);
1130
1131 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1132 {
1133 if (!session[s].opened)
1134 continue;
1135
1136 if (session[s].walled_garden)
1137 continue; // Skip walled garden users.
1138
1139 if (!strncmp(session[s].user, username, 128))
1140 return s;
1141
1142 }
1143 return 0; // Not found.
1144 }
1145
1146 void send_garp(in_addr_t ip)
1147 {
1148 int s;
1149 struct ifreq ifr;
1150 uint8_t mac[6];
1151
1152 s = socket(PF_INET, SOCK_DGRAM, 0);
1153 if (s < 0)
1154 {
1155 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1156 return;
1157 }
1158 memset(&ifr, 0, sizeof(ifr));
1159 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1160 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1161 {
1162 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1163 close(s);
1164 return;
1165 }
1166 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1167 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1168 {
1169 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1170 close(s);
1171 return;
1172 }
1173 close(s);
1174 sendarp(ifr.ifr_ifindex, mac, ip);
1175 }
1176
1177 static sessiont *sessiontbysessionidt(sessionidt s)
1178 {
1179 if (!s || s >= MAXSESSION) return NULL;
1180 return &session[s];
1181 }
1182
1183 static sessionidt sessionidtbysessiont(sessiont *s)
1184 {
1185 sessionidt val = s-session;
1186 if (s < session || val >= MAXSESSION) return 0;
1187 return val;
1188 }
1189
1190 // actually send a control message for a specific tunnel
1191 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1192 {
1193 struct sockaddr_in addr;
1194
1195 CSTAT(tunnelsend);
1196
1197 if (!t)
1198 {
1199 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1200 STAT(tunnel_tx_errors);
1201 return;
1202 }
1203
1204 if (t == TUNNEL_ID_PPPOE)
1205 {
1206 pppoe_sess_send(buf, l, t);
1207 return;
1208 }
1209
1210 if (!tunnel[t].ip)
1211 {
1212 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1213 STAT(tunnel_tx_errors);
1214 return;
1215 }
1216
1217 memset(&addr, 0, sizeof(addr));
1218 addr.sin_family = AF_INET;
1219 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1220 addr.sin_port = htons(tunnel[t].port);
1221
1222 // sequence expected, if sequence in message
1223 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1224
1225 // If this is a control message, deal with retries
1226 if (*buf & 0x80)
1227 {
1228 tunnel[t].last = time_now; // control message sent
1229 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1230 if (tunnel[t].try)
1231 {
1232 STAT(tunnel_retries);
1233 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1234 }
1235 }
1236 #ifdef LAC
1237 if (sendto((tunnel[t].isremotelns?udplacfd:udpfd), buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1238 #else
1239 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1240 #endif
1241 {
1242 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1243 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1244 STAT(tunnel_tx_errors);
1245 return;
1246 }
1247
1248 LOG_HEX(5, "Send Tunnel Data", buf, l);
1249 STAT(tunnel_tx_packets);
1250 INC_STAT(tunnel_tx_bytes, l);
1251 }
1252
1253 //
1254 // Tiny helper function to write data to
1255 // the 'tun' device.
1256 //
1257 int tun_write(uint8_t * data, int size)
1258 {
1259 return write(tunfd, data, size);
1260 }
1261
1262 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1263 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1264 {
1265 int d = (tcp[12] >> 4) * 4;
1266 uint8_t *mss = 0;
1267 uint8_t *opts;
1268 uint8_t *data;
1269 uint16_t orig;
1270 uint32_t sum;
1271
1272 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1273 return;
1274
1275 if (tcp + d > buf + len) // short?
1276 return;
1277
1278 opts = tcp + 20;
1279 data = tcp + d;
1280
1281 while (opts < data)
1282 {
1283 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1284 {
1285 mss = opts + 2;
1286 if (mss + 2 > data) return; // short?
1287 break;
1288 }
1289
1290 if (*opts == 0) return; // end of options
1291 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1292 opts++;
1293 else
1294 opts += opts[1]; // skip over option
1295 }
1296
1297 if (!mss) return; // not found
1298 orig = ntohs(*(uint16_t *) mss);
1299
1300 if (orig <= MSS) return; // mss OK
1301
1302 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1303 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1304 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1305 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1306
1307 // set mss
1308 *(int16_t *) mss = htons(MSS);
1309
1310 // adjust checksum (see rfc1141)
1311 sum = orig + (~MSS & 0xffff);
1312 sum += ntohs(*(uint16_t *) (tcp + 16));
1313 sum = (sum & 0xffff) + (sum >> 16);
1314 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1315 }
1316
1317 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1318 {
1319 uint16_t proto;
1320 if (extra) {
1321 // Skip the four extra bytes
1322 p += 4;
1323 l -= 4;
1324 }
1325
1326 if (*p & 1)
1327 {
1328 proto = *p++;
1329 l--;
1330 }
1331 else
1332 {
1333 proto = ntohs(*(uint16_t *) p);
1334 p += 2;
1335 l -= 2;
1336 }
1337 if (proto == PPPIP)
1338 {
1339 if (session[s].die)
1340 {
1341 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1342 return; // closing session, PPP not processed
1343 }
1344 session[s].last_packet = session[s].last_data = time_now;
1345 processipin(s, t, p, l);
1346 }
1347 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1348 {
1349 if (session[s].die)
1350 {
1351 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1352 return; // closing session, PPP not processed
1353 }
1354
1355 session[s].last_packet = session[s].last_data = time_now;
1356 processipv6in(s, t, p, l);
1357 }
1358 else if (proto == PPPIPCP)
1359 {
1360 session[s].last_packet = session[s].last_data = time_now;
1361 processipcp(s, t, p, l);
1362 }
1363 else if (proto == PPPCCP)
1364 {
1365 session[s].last_packet = session[s].last_data = time_now;
1366 processccp(s, t, p, l);
1367 }
1368 else
1369 {
1370 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1371 }
1372 }
1373
1374 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1375 {
1376 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1377 sp->cout_delta += len;
1378 sp->pout++;
1379 sp->last_data = time_now;
1380
1381 sess_local[s].cout += len; // To send to master..
1382 sess_local[s].pout++;
1383 }
1384
1385 // process outgoing (to tunnel) IP
1386 //
1387 // (i.e. this routine writes to data[-8]).
1388 void processipout(uint8_t *buf, int len)
1389 {
1390 sessionidt s;
1391 sessiont *sp;
1392 tunnelidt t;
1393 in_addr_t ip;
1394
1395 uint8_t *data = buf; // Keep a copy of the originals.
1396 int size = len;
1397
1398 uint8_t fragbuf[MAXETHER + 20];
1399
1400 CSTAT(processipout);
1401
1402 if (len < MIN_IP_SIZE)
1403 {
1404 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1405 STAT(tun_rx_errors);
1406 return;
1407 }
1408 if (len >= MAXETHER)
1409 {
1410 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1411 STAT(tun_rx_errors);
1412 return;
1413 }
1414
1415 // Skip the tun header
1416 buf += 4;
1417 len -= 4;
1418
1419 // Got an IP header now
1420 if (*(uint8_t *)(buf) >> 4 != 4)
1421 {
1422 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1423 return;
1424 }
1425
1426 ip = *(uint32_t *)(buf + 16);
1427 if (!(s = sessionbyip(ip)))
1428 {
1429 // Is this a packet for a session that doesn't exist?
1430 static int rate = 0; // Number of ICMP packets we've sent this second.
1431 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1432
1433 if (last != time_now)
1434 {
1435 last = time_now;
1436 rate = 0;
1437 }
1438
1439 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1440 {
1441 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1442 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1443 config->bind_address ? config->bind_address : my_address, buf, len);
1444 }
1445 return;
1446 }
1447
1448 t = session[s].tunnel;
1449 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1450 {
1451 LOG(3, s, t, "Packet size more than session MRU\n");
1452 return;
1453 }
1454
1455 sp = &session[s];
1456
1457 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1458 if (config->max_packets > 0)
1459 {
1460 if (sess_local[s].last_packet_out == TIME)
1461 {
1462 int max = config->max_packets;
1463
1464 // All packets for throttled sessions are handled by the
1465 // master, so further limit by using the throttle rate.
1466 // A bit of a kludge, since throttle rate is in kbps,
1467 // but should still be generous given our average DSL
1468 // packet size is 200 bytes: a limit of 28kbps equates
1469 // to around 180 packets per second.
1470 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1471 max = sp->throttle_out;
1472
1473 if (++sess_local[s].packets_out > max)
1474 {
1475 sess_local[s].packets_dropped++;
1476 return;
1477 }
1478 }
1479 else
1480 {
1481 if (sess_local[s].packets_dropped)
1482 {
1483 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1484 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1485 sess_local[s].packets_dropped, sess_local[s].packets_out,
1486 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1487 sp->user);
1488 }
1489
1490 sess_local[s].last_packet_out = TIME;
1491 sess_local[s].packets_out = 1;
1492 sess_local[s].packets_dropped = 0;
1493 }
1494 }
1495
1496 // run access-list if any
1497 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1498 return;
1499
1500 // adjust MSS on SYN and SYN,ACK packets with options
1501 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1502 {
1503 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1504 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1505 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1506 }
1507
1508 if (sp->tbf_out)
1509 {
1510 // Are we throttling this session?
1511 if (config->cluster_iam_master)
1512 tbf_queue_packet(sp->tbf_out, data, size);
1513 else
1514 master_throttle_packet(sp->tbf_out, data, size);
1515 return;
1516 }
1517
1518 if (sp->walled_garden && !config->cluster_iam_master)
1519 {
1520 // We are walled-gardening this
1521 master_garden_packet(s, data, size);
1522 return;
1523 }
1524
1525 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1526 {
1527
1528 if (!config->cluster_iam_master)
1529 {
1530 // The MPPP packets must be managed by the Master.
1531 master_forward_mppp_packet(s, data, size);
1532 return;
1533 }
1534
1535 // Add on L2TP header
1536 sessionidt members[MAXBUNDLESES];
1537 bundleidt bid = session[s].bundle;
1538 bundlet *b = &bundle[bid];
1539 uint32_t num_of_links, nb_opened;
1540 int i;
1541
1542 num_of_links = b->num_of_links;
1543 nb_opened = 0;
1544 for (i = 0;i < num_of_links;i++)
1545 {
1546 s = b->members[i];
1547 if (session[s].ppp.lcp == Opened)
1548 {
1549 members[nb_opened] = s;
1550 nb_opened++;
1551 }
1552 }
1553
1554 if (nb_opened < 1)
1555 {
1556 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1557 return;
1558 }
1559
1560 num_of_links = nb_opened;
1561 b->current_ses = (b->current_ses + 1) % num_of_links;
1562 s = members[b->current_ses];
1563 t = session[s].tunnel;
1564 sp = &session[s];
1565 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1566
1567 if (num_of_links > 1)
1568 {
1569 if(len > MINFRAGLEN)
1570 {
1571 //for rotate traffic among the member links
1572 uint32_t divisor = num_of_links;
1573 if (divisor > 2)
1574 divisor = divisor/2 + (divisor & 1);
1575
1576 // Partition the packet to "num_of_links" fragments
1577 uint32_t fraglen = len / divisor;
1578 uint32_t last_fraglen = fraglen + len % divisor;
1579 uint32_t remain = len;
1580
1581 // send the first packet
1582 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1583 if (!p) return;
1584 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1585
1586 // statistics
1587 update_session_out_stat(s, sp, fraglen);
1588
1589 remain -= fraglen;
1590 while (remain > last_fraglen)
1591 {
1592 b->current_ses = (b->current_ses + 1) % num_of_links;
1593 s = members[b->current_ses];
1594 t = session[s].tunnel;
1595 sp = &session[s];
1596 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1597 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1598 if (!p) return;
1599 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1600 update_session_out_stat(s, sp, fraglen);
1601 remain -= fraglen;
1602 }
1603 // send the last fragment
1604 b->current_ses = (b->current_ses + 1) % num_of_links;
1605 s = members[b->current_ses];
1606 t = session[s].tunnel;
1607 sp = &session[s];
1608 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1609 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1610 if (!p) return;
1611 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1612 update_session_out_stat(s, sp, remain);
1613 if (remain != last_fraglen)
1614 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1615 }
1616 else
1617 {
1618 // Send it as one frame
1619 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1620 if (!p) return;
1621 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1622 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1623 update_session_out_stat(s, sp, len);
1624 }
1625 }
1626 else
1627 {
1628 // Send it as one frame (NO MPPP Frame)
1629 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1630 tunnelsend(p, len + (buf-p), t); // send it...
1631 update_session_out_stat(s, sp, len);
1632 }
1633 }
1634 else
1635 {
1636 uint8_t *p = opt_makeppp(buf, len, s, t, PPPIP, 0, 0, 0);
1637 tunnelsend(p, len + (buf-p), t); // send it...
1638 update_session_out_stat(s, sp, len);
1639 }
1640
1641 // Snooping this session, send it to intercept box
1642 if (sp->snoop_ip && sp->snoop_port)
1643 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1644
1645 udp_tx += len;
1646 }
1647
1648 // process outgoing (to tunnel) IPv6
1649 //
1650 static void processipv6out(uint8_t * buf, int len)
1651 {
1652 sessionidt s;
1653 sessiont *sp;
1654 tunnelidt t;
1655 in_addr_t ip;
1656 struct in6_addr ip6;
1657
1658 uint8_t *data = buf; // Keep a copy of the originals.
1659 int size = len;
1660
1661 uint8_t b[MAXETHER + 20];
1662
1663 CSTAT(processipv6out);
1664
1665 if (len < MIN_IP_SIZE)
1666 {
1667 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1668 STAT(tunnel_tx_errors);
1669 return;
1670 }
1671 if (len >= MAXETHER)
1672 {
1673 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1674 STAT(tunnel_tx_errors);
1675 return;
1676 }
1677
1678 // Skip the tun header
1679 buf += 4;
1680 len -= 4;
1681
1682 // Got an IP header now
1683 if (*(uint8_t *)(buf) >> 4 != 6)
1684 {
1685 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1686 return;
1687 }
1688
1689 ip6 = *(struct in6_addr *)(buf+24);
1690 s = sessionbyipv6(ip6);
1691
1692 if (s == 0)
1693 {
1694 ip = *(uint32_t *)(buf + 32);
1695 s = sessionbyip(ip);
1696 }
1697
1698 if (s == 0)
1699 {
1700 // Is this a packet for a session that doesn't exist?
1701 static int rate = 0; // Number of ICMP packets we've sent this second.
1702 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1703
1704 if (last != time_now)
1705 {
1706 last = time_now;
1707 rate = 0;
1708 }
1709
1710 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1711 {
1712 // FIXME: Should send icmp6 host unreachable
1713 }
1714 return;
1715 }
1716 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1717 {
1718 bundleidt bid = session[s].bundle;
1719 bundlet *b = &bundle[bid];
1720
1721 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1722 s = b->members[b->current_ses];
1723 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1724 }
1725 t = session[s].tunnel;
1726 sp = &session[s];
1727 sp->last_data = time_now;
1728
1729 // FIXME: add DoS prevention/filters?
1730
1731 if (sp->tbf_out)
1732 {
1733 // Are we throttling this session?
1734 if (config->cluster_iam_master)
1735 tbf_queue_packet(sp->tbf_out, data, size);
1736 else
1737 master_throttle_packet(sp->tbf_out, data, size);
1738 return;
1739 }
1740 else if (sp->walled_garden && !config->cluster_iam_master)
1741 {
1742 // We are walled-gardening this
1743 master_garden_packet(s, data, size);
1744 return;
1745 }
1746
1747 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1748
1749 // Add on L2TP header
1750 {
1751 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1752 if (!p) return;
1753 tunnelsend(b, len + (p-b), t); // send it...
1754 }
1755
1756 // Snooping this session, send it to intercept box
1757 if (sp->snoop_ip && sp->snoop_port)
1758 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1759
1760 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1761 sp->cout_delta += len;
1762 sp->pout++;
1763 udp_tx += len;
1764
1765 sess_local[s].cout += len; // To send to master..
1766 sess_local[s].pout++;
1767 }
1768
1769 //
1770 // Helper routine for the TBF filters.
1771 // Used to send queued data in to the user!
1772 //
1773 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1774 {
1775 sessiont *sp;
1776 tunnelidt t;
1777
1778 uint8_t b[MAXETHER + 20];
1779
1780 if (len < 0 || len > MAXETHER)
1781 {
1782 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1783 return;
1784 }
1785
1786 // Skip the tun header
1787 buf += 4;
1788 len -= 4;
1789
1790 if (!session[s].ip)
1791 return;
1792
1793 t = session[s].tunnel;
1794 sp = &session[s];
1795
1796 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1797
1798 // Add on L2TP header
1799 {
1800 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1801 if (!p) return;
1802 tunnelsend(b, len + (p-b), t); // send it...
1803 }
1804
1805 // Snooping this session.
1806 if (sp->snoop_ip && sp->snoop_port)
1807 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1808
1809 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1810 sp->cout_delta += len;
1811 sp->pout++;
1812 udp_tx += len;
1813
1814 sess_local[s].cout += len; // To send to master..
1815 sess_local[s].pout++;
1816 }
1817
1818 // add an AVP (16 bit)
1819 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1820 {
1821 uint16_t l = (m ? 0x8008 : 0x0008);
1822 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1823 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1824 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1825 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1826 c->length += 8;
1827 }
1828
1829 // add an AVP (32 bit)
1830 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1831 {
1832 uint16_t l = (m ? 0x800A : 0x000A);
1833 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1834 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1835 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1836 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1837 c->length += 10;
1838 }
1839
1840 // add an AVP (string)
1841 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1842 {
1843 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1844 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1845 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1846 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1847 memcpy(c->buf + c->length + 6, val, strlen(val));
1848 c->length += 6 + strlen(val);
1849 }
1850
1851 // add a binary AVP
1852 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1853 {
1854 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1855 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1856 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1857 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1858 memcpy(c->buf + c->length + 6, val, len);
1859 c->length += 6 + len;
1860 }
1861
1862 // new control connection
1863 static controlt *controlnew(uint16_t mtype)
1864 {
1865 controlt *c;
1866 if (!controlfree)
1867 c = malloc(sizeof(controlt));
1868 else
1869 {
1870 c = controlfree;
1871 controlfree = c->next;
1872 }
1873 assert(c);
1874 c->next = 0;
1875 c->buf[0] = 0xC8; // flags
1876 c->buf[1] = 0x02; // ver
1877 c->length = 12;
1878 control16(c, 0, mtype, 1);
1879 return c;
1880 }
1881
1882 // send zero block if nothing is waiting
1883 // (ZLB send).
1884 static void controlnull(tunnelidt t)
1885 {
1886 uint16_t buf[6];
1887 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1888 return;
1889
1890 buf[0] = htons(0xC802); // flags/ver
1891 buf[1] = htons(12); // length
1892 buf[2] = htons(tunnel[t].far); // tunnel
1893 buf[3] = htons(0); // session
1894 buf[4] = htons(tunnel[t].ns); // sequence
1895 buf[5] = htons(tunnel[t].nr); // sequence
1896 tunnelsend((uint8_t *)buf, 12, t);
1897 }
1898
1899 // add a control message to a tunnel, and send if within window
1900 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1901 {
1902 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1903 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1904 *(uint16_t *) (c->buf + 6) = htons(far); // session
1905 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1906 tunnel[t].ns++; // advance sequence
1907 // link in message in to queue
1908 if (tunnel[t].controlc)
1909 tunnel[t].controle->next = c;
1910 else
1911 tunnel[t].controls = c;
1912
1913 tunnel[t].controle = c;
1914 tunnel[t].controlc++;
1915
1916 // send now if space in window
1917 if (tunnel[t].controlc <= tunnel[t].window)
1918 {
1919 tunnel[t].try = 0; // first send
1920 tunnelsend(c->buf, c->length, t);
1921 }
1922 }
1923
1924 //
1925 // Throttle or Unthrottle a session
1926 //
1927 // Throttle the data from/to through a session to no more than
1928 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1929 // user).
1930 //
1931 // If either value is -1, the current value is retained for that
1932 // direction.
1933 //
1934 void throttle_session(sessionidt s, int rate_in, int rate_out)
1935 {
1936 if (!session[s].opened)
1937 return; // No-one home.
1938
1939 if (!*session[s].user)
1940 return; // User not logged in
1941
1942 if (rate_in >= 0)
1943 {
1944 int bytes = rate_in * 1024 / 8; // kbits to bytes
1945 if (session[s].tbf_in)
1946 free_tbf(session[s].tbf_in);
1947
1948 if (rate_in > 0)
1949 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1950 else
1951 session[s].tbf_in = 0;
1952
1953 session[s].throttle_in = rate_in;
1954 }
1955
1956 if (rate_out >= 0)
1957 {
1958 int bytes = rate_out * 1024 / 8;
1959 if (session[s].tbf_out)
1960 free_tbf(session[s].tbf_out);
1961
1962 if (rate_out > 0)
1963 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1964 else
1965 session[s].tbf_out = 0;
1966
1967 session[s].throttle_out = rate_out;
1968 }
1969 }
1970
1971 // add/remove filters from session (-1 = no change)
1972 void filter_session(sessionidt s, int filter_in, int filter_out)
1973 {
1974 if (!session[s].opened)
1975 return; // No-one home.
1976
1977 if (!*session[s].user)
1978 return; // User not logged in
1979
1980 // paranoia
1981 if (filter_in > MAXFILTER) filter_in = -1;
1982 if (filter_out > MAXFILTER) filter_out = -1;
1983 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1984 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1985
1986 if (filter_in >= 0)
1987 {
1988 if (session[s].filter_in)
1989 ip_filters[session[s].filter_in - 1].used--;
1990
1991 if (filter_in > 0)
1992 ip_filters[filter_in - 1].used++;
1993
1994 session[s].filter_in = filter_in;
1995 }
1996
1997 if (filter_out >= 0)
1998 {
1999 if (session[s].filter_out)
2000 ip_filters[session[s].filter_out - 1].used--;
2001
2002 if (filter_out > 0)
2003 ip_filters[filter_out - 1].used++;
2004
2005 session[s].filter_out = filter_out;
2006 }
2007 }
2008
2009 // start tidy shutdown of session
2010 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2011 {
2012 int walled_garden = session[s].walled_garden;
2013 bundleidt b = session[s].bundle;
2014 //delete routes only for last session in bundle (in case of MPPP)
2015 int del_routes = !b || (bundle[b].num_of_links == 1);
2016
2017 CSTAT(sessionshutdown);
2018
2019 if (!session[s].opened)
2020 {
2021 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2022 return; // not a live session
2023 }
2024
2025 if (!session[s].die)
2026 {
2027 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2028 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2029 run_plugins(PLUGIN_KILL_SESSION, &data);
2030 }
2031
2032 if (session[s].ip && !walled_garden && !session[s].die)
2033 {
2034 // RADIUS Stop message
2035 uint16_t r = radiusnew(s);
2036 if (r)
2037 {
2038 // stop, if not already trying
2039 if (radius[r].state != RADIUSSTOP)
2040 {
2041 radius[r].term_cause = term_cause;
2042 radius[r].term_msg = reason;
2043 radiussend(r, RADIUSSTOP);
2044 }
2045 }
2046 else
2047 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2048
2049 // Save counters to dump to accounting file
2050 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2051 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2052 }
2053
2054 if (!session[s].die)
2055 session[s].die = TIME + 150; // Clean up in 15 seconds
2056
2057 if (session[s].ip)
2058 { // IP allocated, clear and unroute
2059 int r;
2060 int routed = 0;
2061 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2062 {
2063 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2064 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2065 routed++;
2066
2067 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2068 session[s].route[r].ip = 0;
2069 }
2070
2071 if (session[s].ip_pool_index == -1) // static ip
2072 {
2073 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2074 session[s].ip = 0;
2075 }
2076 else
2077 free_ip_address(s);
2078
2079 // unroute IPv6, if setup
2080 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2081 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2082
2083 if (b)
2084 {
2085 // This session was part of a bundle
2086 bundle[b].num_of_links--;
2087 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2088 if(bundle[b].num_of_links == 0)
2089 {
2090 bundleclear(b);
2091 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2092 }
2093 else
2094 {
2095 // Adjust the members array to accomodate the new change
2096 uint8_t mem_num = 0;
2097 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2098 if(bundle[b].members[bundle[b].num_of_links] != s)
2099 {
2100 uint8_t ml;
2101 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2102 if(bundle[b].members[ml] == s)
2103 {
2104 mem_num = ml;
2105 break;
2106 }
2107 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2108 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2109
2110 // If the killed session is the first of the bundle,
2111 // the new first session must be stored in the cache_ipmap
2112 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2113 if (mem_num == 0)
2114 {
2115 sessionidt new_s = bundle[b].members[0];
2116
2117 routed = 0;
2118 // Add the route for this session.
2119 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2120 {
2121 int i, prefixlen;
2122 in_addr_t ip;
2123
2124 prefixlen = session[new_s].route[r].prefixlen;
2125 ip = session[new_s].route[r].ip;
2126
2127 if (!prefixlen) prefixlen = 32;
2128 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2129
2130 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2131 cache_ipmap(i, new_s);
2132 }
2133 cache_ipmap(session[new_s].ip, new_s);
2134
2135 // IPV6 route
2136 if (session[new_s].ipv6prefixlen)
2137 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2138 }
2139 }
2140 }
2141
2142 cluster_send_bundle(b);
2143 }
2144 }
2145
2146 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2147 throttle_session(s, 0, 0);
2148
2149 if (cdn_result)
2150 {
2151 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2152 {
2153 pppoe_shutdown_session(s);
2154 }
2155 else
2156 {
2157 // Send CDN
2158 controlt *c = controlnew(14); // sending CDN
2159 if (cdn_error)
2160 {
2161 uint16_t buf[2];
2162 buf[0] = htons(cdn_result);
2163 buf[1] = htons(cdn_error);
2164 controlb(c, 1, (uint8_t *)buf, 4, 1);
2165 }
2166 else
2167 control16(c, 1, cdn_result, 1);
2168
2169 control16(c, 14, s, 1); // assigned session (our end)
2170 controladd(c, session[s].far, session[s].tunnel); // send the message
2171 }
2172 }
2173
2174 // update filter refcounts
2175 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2176 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2177
2178 // clear PPP state
2179 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2180 sess_local[s].lcp.restart = 0;
2181 sess_local[s].ipcp.restart = 0;
2182 sess_local[s].ipv6cp.restart = 0;
2183 sess_local[s].ccp.restart = 0;
2184
2185 cluster_send_session(s);
2186 }
2187
2188 void sendipcp(sessionidt s, tunnelidt t)
2189 {
2190 uint8_t buf[MAXETHER];
2191 uint8_t *q;
2192
2193 CSTAT(sendipcp);
2194 LOG(3, s, t, "IPCP: send ConfigReq\n");
2195
2196 if (!session[s].unique_id)
2197 {
2198 if (!++last_id) ++last_id; // skip zero
2199 session[s].unique_id = last_id;
2200 }
2201
2202 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2203 if (!q) return;
2204
2205 *q = ConfigReq;
2206 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2207 *(uint16_t *) (q + 2) = htons(10); // packet length
2208 q[4] = 3; // ip address option
2209 q[5] = 6; // option length
2210 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2211 config->iftun_address ? config->iftun_address :
2212 my_address; // send my IP
2213
2214 tunnelsend(buf, 10 + (q - buf), t); // send it
2215 restart_timer(s, ipcp);
2216 }
2217
2218 void sendipv6cp(sessionidt s, tunnelidt t)
2219 {
2220 uint8_t buf[MAXETHER];
2221 uint8_t *q;
2222
2223 CSTAT(sendipv6cp);
2224 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2225
2226 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2227 if (!q) return;
2228
2229 *q = ConfigReq;
2230 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2231 // only send one type
2232 // of request
2233 *(uint16_t *) (q + 2) = htons(14);
2234 q[4] = 1; // interface identifier option
2235 q[5] = 10; // option length
2236 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2237 *(uint32_t *) (q + 10) = 0;
2238 q[13] = 1;
2239
2240 tunnelsend(buf, 14 + (q - buf), t); // send it
2241 restart_timer(s, ipv6cp);
2242 }
2243
2244 static void sessionclear(sessionidt s)
2245 {
2246 memset(&session[s], 0, sizeof(session[s]));
2247 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2248 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2249
2250 session[s].tunnel = T_FREE; // Mark it as free.
2251 session[s].next = sessionfree;
2252 sessionfree = s;
2253 }
2254
2255 // kill a session now
2256 void sessionkill(sessionidt s, char *reason)
2257 {
2258 CSTAT(sessionkill);
2259
2260 if (!session[s].opened) // not alive
2261 return;
2262
2263 if (session[s].next)
2264 {
2265 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2266 return;
2267 }
2268
2269 if (!session[s].die)
2270 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2271
2272 if (sess_local[s].radius)
2273 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2274
2275 #ifdef LAC
2276 if (session[s].forwardtosession)
2277 {
2278 sessionidt sess = session[s].forwardtosession;
2279 if (session[sess].forwardtosession == s)
2280 {
2281 // Shutdown the linked session also.
2282 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2283 }
2284 }
2285 #endif
2286
2287 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2288 sessionclear(s);
2289 cluster_send_session(s);
2290 }
2291
2292 static void tunnelclear(tunnelidt t)
2293 {
2294 if (!t) return;
2295 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2296 tunnel[t].state = TUNNELFREE;
2297 }
2298
2299 static void bundleclear(bundleidt b)
2300 {
2301 if (!b) return;
2302 memset(&bundle[b], 0, sizeof(bundle[b]));
2303 bundle[b].state = BUNDLEFREE;
2304 }
2305
2306 // kill a tunnel now
2307 static void tunnelkill(tunnelidt t, char *reason)
2308 {
2309 sessionidt s;
2310 controlt *c;
2311
2312 CSTAT(tunnelkill);
2313
2314 tunnel[t].state = TUNNELDIE;
2315
2316 // free control messages
2317 while ((c = tunnel[t].controls))
2318 {
2319 controlt * n = c->next;
2320 tunnel[t].controls = n;
2321 tunnel[t].controlc--;
2322 c->next = controlfree;
2323 controlfree = c;
2324 }
2325 // kill sessions
2326 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2327 if (session[s].tunnel == t)
2328 sessionkill(s, reason);
2329
2330 // free tunnel
2331 tunnelclear(t);
2332 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2333 cli_tunnel_actions[t].action = 0;
2334 cluster_send_tunnel(t);
2335 }
2336
2337 // shut down a tunnel cleanly
2338 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2339 {
2340 sessionidt s;
2341
2342 CSTAT(tunnelshutdown);
2343
2344 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2345 {
2346 // never set up, can immediately kill
2347 tunnelkill(t, reason);
2348 return;
2349 }
2350 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2351
2352 // close session
2353 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2354 if (session[s].tunnel == t)
2355 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2356
2357 tunnel[t].state = TUNNELDIE;
2358 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2359 cluster_send_tunnel(t);
2360 // TBA - should we wait for sessions to stop?
2361 if (result)
2362 {
2363 controlt *c = controlnew(4); // sending StopCCN
2364 if (error)
2365 {
2366 uint16_t buf[32];
2367 int l = 4;
2368 buf[0] = htons(result);
2369 buf[1] = htons(error);
2370 if (msg)
2371 {
2372 int m = strlen(msg);
2373 if (m + 4 > sizeof(buf))
2374 m = sizeof(buf) - 4;
2375
2376 memcpy(buf+2, msg, m);
2377 l += m;
2378 }
2379
2380 controlb(c, 1, (uint8_t *)buf, l, 1);
2381 }
2382 else
2383 control16(c, 1, result, 1);
2384
2385 control16(c, 9, t, 1); // assigned tunnel (our end)
2386 controladd(c, 0, t); // send the message
2387 }
2388 }
2389
2390 // read and process packet on tunnel (UDP)
2391 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2392 {
2393 uint8_t *chapresponse = NULL;
2394 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2395 uint8_t *p = buf + 2;
2396
2397
2398 CSTAT(processudp);
2399
2400 udp_rx += len;
2401 udp_rx_pkt++;
2402 LOG_HEX(5, "UDP Data", buf, len);
2403 STAT(tunnel_rx_packets);
2404 INC_STAT(tunnel_rx_bytes, len);
2405 if (len < 6)
2406 {
2407 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2408 STAT(tunnel_rx_errors);
2409 return;
2410 }
2411 if ((buf[1] & 0x0F) != 2)
2412 {
2413 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2414 STAT(tunnel_rx_errors);
2415 return;
2416 }
2417 if (*buf & 0x40)
2418 { // length
2419 l = ntohs(*(uint16_t *) p);
2420 p += 2;
2421 }
2422 t = ntohs(*(uint16_t *) p);
2423 p += 2;
2424 s = ntohs(*(uint16_t *) p);
2425 p += 2;
2426 if (s >= MAXSESSION)
2427 {
2428 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2429 STAT(tunnel_rx_errors);
2430 return;
2431 }
2432 if (t >= MAXTUNNEL)
2433 {
2434 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2435 STAT(tunnel_rx_errors);
2436 return;
2437 }
2438 if (t == TUNNEL_ID_PPPOE)
2439 {
2440 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2441 STAT(tunnel_rx_errors);
2442 return;
2443 }
2444 if (*buf & 0x08)
2445 { // ns/nr
2446 ns = ntohs(*(uint16_t *) p);
2447 p += 2;
2448 nr = ntohs(*(uint16_t *) p);
2449 p += 2;
2450 }
2451 if (*buf & 0x02)
2452 { // offset
2453 uint16_t o = ntohs(*(uint16_t *) p);
2454 p += o + 2;
2455 }
2456 if ((p - buf) > l)
2457 {
2458 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2459 STAT(tunnel_rx_errors);
2460 return;
2461 }
2462 l -= (p - buf);
2463
2464 // used to time out old tunnels
2465 if (t && tunnel[t].state == TUNNELOPEN)
2466 tunnel[t].lastrec = time_now;
2467
2468 if (*buf & 0x80)
2469 { // control
2470 uint16_t message = 0xFFFF; // message type
2471 uint8_t fatal = 0;
2472 uint8_t mandatory = 0;
2473 uint16_t asession = 0; // assigned session
2474 uint32_t amagic = 0; // magic number
2475 uint8_t aflags = 0; // flags from last LCF
2476 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2477 char called[MAXTEL] = ""; // called number
2478 char calling[MAXTEL] = ""; // calling number
2479
2480 if (!config->cluster_iam_master)
2481 {
2482 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2483 return;
2484 }
2485
2486 // control messages must have bits 0x80|0x40|0x08
2487 // (type, length and sequence) set, and bits 0x02|0x01
2488 // (offset and priority) clear
2489 if ((*buf & 0xCB) != 0xC8)
2490 {
2491 LOG(1, s, t, "Bad control header %02X\n", *buf);
2492 STAT(tunnel_rx_errors);
2493 return;
2494 }
2495
2496 // check for duplicate tunnel open message
2497 if (!t && ns == 0)
2498 {
2499 int i;
2500
2501 //
2502 // Is this a duplicate of the first packet? (SCCRQ)
2503 //
2504 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2505 {
2506 if (tunnel[i].state != TUNNELOPENING ||
2507 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2508 tunnel[i].port != ntohs(addr->sin_port) )
2509 continue;
2510 t = i;
2511 LOG(3, s, t, "Duplicate SCCRQ?\n");
2512 break;
2513 }
2514 }
2515
2516 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2517 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2518
2519 // if no tunnel specified, assign one
2520 if (!t)
2521 {
2522 if (!(t = new_tunnel()))
2523 {
2524 LOG(1, 0, 0, "No more tunnels\n");
2525 STAT(tunnel_overflow);
2526 return;
2527 }
2528 tunnelclear(t);
2529 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2530 tunnel[t].port = ntohs(addr->sin_port);
2531 tunnel[t].window = 4; // default window
2532 STAT(tunnel_created);
2533 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2534 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2535 }
2536
2537 // If the 'ns' just received is not the 'nr' we're
2538 // expecting, just send an ack and drop it.
2539 //
2540 // if 'ns' is less, then we got a retransmitted packet.
2541 // if 'ns' is greater than missed a packet. Either way
2542 // we should ignore it.
2543 if (ns != tunnel[t].nr)
2544 {
2545 // is this the sequence we were expecting?
2546 STAT(tunnel_rx_errors);
2547 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2548 t, ns, tunnel[t].nr);
2549
2550 if (l) // Is this not a ZLB?
2551 controlnull(t);
2552 return;
2553 }
2554
2555 // check sequence of this message
2556 {
2557 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2558 // some to clear maybe?
2559 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2560 {
2561 controlt *c = tunnel[t].controls;
2562 tunnel[t].controls = c->next;
2563 tunnel[t].controlc--;
2564 c->next = controlfree;
2565 controlfree = c;
2566 skip--;
2567 tunnel[t].try = 0; // we have progress
2568 }
2569
2570 // receiver advance (do here so quoted correctly in any sends below)
2571 if (l) tunnel[t].nr = (ns + 1);
2572 if (skip < 0) skip = 0;
2573 if (skip < tunnel[t].controlc)
2574 {
2575 // some control packets can now be sent that were previous stuck out of window
2576 int tosend = tunnel[t].window - skip;
2577 controlt *c = tunnel[t].controls;
2578 while (c && skip)
2579 {
2580 c = c->next;
2581 skip--;
2582 }
2583 while (c && tosend)
2584 {
2585 tunnel[t].try = 0; // first send
2586 tunnelsend(c->buf, c->length, t);
2587 c = c->next;
2588 tosend--;
2589 }
2590 }
2591 if (!tunnel[t].controlc)
2592 tunnel[t].retry = 0; // caught up
2593 }
2594 if (l)
2595 { // if not a null message
2596 int result = 0;
2597 int error = 0;
2598 char *msg = 0;
2599
2600 // Default disconnect cause/message on receipt of CDN. Set to
2601 // more specific value from attribute 1 (result code) or 46
2602 // (disconnect cause) if present below.
2603 int disc_cause_set = 0;
2604 int disc_cause = TERM_NAS_REQUEST;
2605 char const *disc_reason = "Closed (Received CDN).";
2606
2607 // process AVPs
2608 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2609 {
2610 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2611 uint8_t *b = p;
2612 uint8_t flags = *p;
2613 uint16_t mtype;
2614
2615 if (n > l)
2616 {
2617 LOG(1, s, t, "Invalid length in AVP\n");
2618 STAT(tunnel_rx_errors);
2619 return;
2620 }
2621 p += n; // next
2622 l -= n;
2623 if (flags & 0x3C) // reserved bits, should be clear
2624 {
2625 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2626 fatal = flags;
2627 result = 2; // general error
2628 error = 3; // reserved field non-zero
2629 msg = 0;
2630 continue; // next
2631 }
2632 b += 2;
2633 if (*(uint16_t *) (b))
2634 {
2635 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2636 fatal = flags;
2637 result = 2; // general error
2638 error = 6; // generic vendor-specific error
2639 msg = "unsupported vendor-specific";
2640 continue; // next
2641 }
2642 b += 2;
2643 mtype = ntohs(*(uint16_t *) (b));
2644 b += 2;
2645 n -= 6;
2646
2647 if (flags & 0x40)
2648 {
2649 uint16_t orig_len;
2650
2651 // handle hidden AVPs
2652 if (!*config->l2tp_secret)
2653 {
2654 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2655 fatal = flags;
2656 result = 2; // general error
2657 error = 6; // generic vendor-specific error
2658 msg = "secret not specified";
2659 continue;
2660 }
2661 if (!session[s].random_vector_length)
2662 {
2663 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2664 fatal = flags;
2665 result = 2; // general error
2666 error = 6; // generic
2667 msg = "no random vector";
2668 continue;
2669 }
2670 if (n < 8)
2671 {
2672 LOG(2, s, t, "Short hidden AVP.\n");
2673 fatal = flags;
2674 result = 2; // general error
2675 error = 2; // length is wrong
2676 msg = 0;
2677 continue;
2678 }
2679
2680 // Unhide the AVP
2681 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2682
2683 orig_len = ntohs(*(uint16_t *) b);
2684 if (orig_len > n + 2)
2685 {
2686 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2687 orig_len, n);
2688
2689 fatal = flags;
2690 result = 2; // general error
2691 error = 2; // length is wrong
2692 msg = 0;
2693 continue;
2694 }
2695
2696 b += 2;
2697 n = orig_len;
2698 }
2699
2700 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2701 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2702
2703 switch (mtype)
2704 {
2705 case 0: // message type
2706 message = ntohs(*(uint16_t *) b);
2707 mandatory = flags & 0x80;
2708 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2709 break;
2710 case 1: // result code
2711 {
2712 uint16_t rescode = ntohs(*(uint16_t *) b);
2713 char const *resdesc = "(unknown)";
2714 char const *errdesc = NULL;
2715 int cause = 0;
2716
2717 if (message == 4)
2718 { /* StopCCN */
2719 resdesc = l2tp_stopccn_result_code(rescode);
2720 cause = TERM_LOST_SERVICE;
2721 }
2722 else if (message == 14)
2723 { /* CDN */
2724 resdesc = l2tp_cdn_result_code(rescode);
2725 if (rescode == 1)
2726 cause = TERM_LOST_CARRIER;
2727 else
2728 cause = TERM_ADMIN_RESET;
2729 }
2730
2731 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2732 if (n >= 4)
2733 {
2734 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2735 errdesc = l2tp_error_code(errcode);
2736 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2737 }
2738 if (n > 4)
2739 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2740
2741 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2742 {
2743 disc_cause_set = mtype;
2744 disc_reason = errdesc ? errdesc : resdesc;
2745 disc_cause = cause;
2746 }
2747
2748 break;
2749 }
2750 break;
2751 case 2: // protocol version
2752 {
2753 version = ntohs(*(uint16_t *) (b));
2754 LOG(4, s, t, " Protocol version = %u\n", version);
2755 if (version && version != 0x0100)
2756 { // allow 0.0 and 1.0
2757 LOG(1, s, t, " Bad protocol version %04X\n", version);
2758 fatal = flags;
2759 result = 5; // unspported protocol version
2760 error = 0x0100; // supported version
2761 msg = 0;
2762 continue; // next
2763 }
2764 }
2765 break;
2766 case 3: // framing capabilities
2767 break;
2768 case 4: // bearer capabilities
2769 break;
2770 case 5: // tie breaker
2771 // We never open tunnels, so we don't care about tie breakers
2772 continue;
2773 case 6: // firmware revision
2774 break;
2775 case 7: // host name
2776 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2777 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2778 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2779 // TBA - to send to RADIUS
2780 break;
2781 case 8: // vendor name
2782 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2783 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2784 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2785 break;
2786 case 9: // assigned tunnel
2787 tunnel[t].far = ntohs(*(uint16_t *) (b));
2788 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2789 break;
2790 case 10: // rx window
2791 tunnel[t].window = ntohs(*(uint16_t *) (b));
2792 if (!tunnel[t].window)
2793 tunnel[t].window = 1; // window of 0 is silly
2794 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2795 break;
2796 case 11: // Challenge
2797 {
2798 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2799 build_chap_response(b, 2, n, &chapresponse);
2800 }
2801 break;
2802 case 13: // Response
2803 #ifdef LAC
2804 if (tunnel[t].isremotelns)
2805 {
2806 chapresponse = calloc(17, 1);
2807 memcpy(chapresponse, b, (n < 17) ? n : 16);
2808 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2809 }
2810 else
2811 #endif /* LAC */
2812 // Why did they send a response? We never challenge.
2813 LOG(2, s, t, " received unexpected challenge response\n");
2814 break;
2815
2816 case 14: // assigned session
2817 asession = session[s].far = ntohs(*(uint16_t *) (b));
2818 LOG(4, s, t, " assigned session = %u\n", asession);
2819 break;
2820 case 15: // call serial number
2821 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2822 break;
2823 case 18: // bearer type
2824 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2825 // TBA - for RADIUS
2826 break;
2827 case 19: // framing type
2828 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2829 // TBA
2830 break;
2831 case 21: // called number
2832 memset(called, 0, sizeof(called));
2833 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2834 LOG(4, s, t, " Called <%s>\n", called);
2835 break;
2836 case 22: // calling number
2837 memset(calling, 0, sizeof(calling));
2838 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2839 LOG(4, s, t, " Calling <%s>\n", calling);
2840 break;
2841 case 23: // subtype
2842 break;
2843 case 24: // tx connect speed
2844 if (n == 4)
2845 {
2846 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2847 }
2848 else
2849 {
2850 // AS5300s send connect speed as a string
2851 char tmp[30];
2852 memset(tmp, 0, sizeof(tmp));
2853 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2854 session[s].tx_connect_speed = atol(tmp);
2855 }
2856 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2857 break;
2858 case 38: // rx connect speed
2859 if (n == 4)
2860 {
2861 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2862 }
2863 else
2864 {
2865 // AS5300s send connect speed as a string
2866 char tmp[30];
2867 memset(tmp, 0, sizeof(tmp));
2868 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2869 session[s].rx_connect_speed = atol(tmp);
2870 }
2871 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2872 break;
2873 case 25: // Physical Channel ID
2874 {
2875 uint32_t tmp = ntohl(*(uint32_t *) b);
2876 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2877 break;
2878 }
2879 case 29: // Proxy Authentication Type
2880 {
2881 uint16_t atype = ntohs(*(uint16_t *)b);
2882 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2883 break;
2884 }
2885 case 30: // Proxy Authentication Name
2886 {
2887 char authname[64];
2888 memset(authname, 0, sizeof(authname));
2889 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2890 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2891 authname);
2892 break;
2893 }
2894 case 31: // Proxy Authentication Challenge
2895 {
2896 LOG(4, s, t, " Proxy Auth Challenge\n");
2897 break;
2898 }
2899 case 32: // Proxy Authentication ID
2900 {
2901 uint16_t authid = ntohs(*(uint16_t *)(b));
2902 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2903 break;
2904 }
2905 case 33: // Proxy Authentication Response
2906 LOG(4, s, t, " Proxy Auth Response\n");
2907 break;
2908 case 27: // last sent lcp
2909 { // find magic number
2910 uint8_t *p = b, *e = p + n;
2911 while (p + 1 < e && p[1] && p + p[1] <= e)
2912 {
2913 if (*p == 5 && p[1] == 6) // Magic-Number
2914 amagic = ntohl(*(uint32_t *) (p + 2));
2915 else if (*p == 7) // Protocol-Field-Compression
2916 aflags |= SESSION_PFC;
2917 else if (*p == 8) // Address-and-Control-Field-Compression
2918 aflags |= SESSION_ACFC;
2919 p += p[1];
2920 }
2921 }
2922 break;
2923 case 28: // last recv lcp confreq
2924 break;
2925 case 26: // Initial Received LCP CONFREQ
2926 break;
2927 case 39: // seq required - we control it as an LNS anyway...
2928 break;
2929 case 36: // Random Vector
2930 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2931 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2932 if (n > sizeof(session[s].random_vector))
2933 n = sizeof(session[s].random_vector);
2934 memcpy(session[s].random_vector, b, n);
2935 session[s].random_vector_length = n;
2936 break;
2937 case 46: // ppp disconnect cause
2938 if (n >= 5)
2939 {
2940 uint16_t code = ntohs(*(uint16_t *) b);
2941 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2942 uint8_t dir = *(b + 4);
2943
2944 LOG(4, s, t, " PPP disconnect cause "
2945 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2946 code, proto, dir, n - 5, b + 5);
2947
2948 disc_cause_set = mtype;
2949
2950 switch (code)
2951 {
2952 case 1: // admin disconnect
2953 disc_cause = TERM_ADMIN_RESET;
2954 disc_reason = "Administrative disconnect";
2955 break;
2956 case 3: // lcp terminate
2957 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2958 disc_cause = TERM_USER_REQUEST;
2959 disc_reason = "Normal disconnection";
2960 break;
2961 case 4: // compulsory encryption unavailable
2962 if (dir != 1) break; // 1=refused by peer, 2=local
2963 disc_cause = TERM_USER_ERROR;
2964 disc_reason = "Compulsory encryption refused";
2965 break;
2966 case 5: // lcp: fsm timeout
2967 disc_cause = TERM_PORT_ERROR;
2968 disc_reason = "LCP: FSM timeout";
2969 break;
2970 case 6: // lcp: no recognisable lcp packets received
2971 disc_cause = TERM_PORT_ERROR;
2972 disc_reason = "LCP: no recognisable LCP packets";
2973 break;
2974 case 7: // lcp: magic-no error (possibly looped back)
2975 disc_cause = TERM_PORT_ERROR;
2976 disc_reason = "LCP: magic-no error (possible loop)";
2977 break;
2978 case 8: // lcp: echo request timeout
2979 disc_cause = TERM_PORT_ERROR;
2980 disc_reason = "LCP: echo request timeout";
2981 break;
2982 case 13: // auth: fsm timeout
2983 disc_cause = TERM_SERVICE_UNAVAILABLE;
2984 disc_reason = "Authentication: FSM timeout";
2985 break;
2986 case 15: // auth: unacceptable auth protocol
2987 disc_cause = TERM_SERVICE_UNAVAILABLE;
2988 disc_reason = "Unacceptable authentication protocol";
2989 break;
2990 case 16: // auth: authentication failed
2991 disc_cause = TERM_SERVICE_UNAVAILABLE;
2992 disc_reason = "Authentication failed";
2993 break;
2994 case 17: // ncp: fsm timeout
2995 disc_cause = TERM_SERVICE_UNAVAILABLE;
2996 disc_reason = "NCP: FSM timeout";
2997 break;
2998 case 18: // ncp: no ncps available
2999 disc_cause = TERM_SERVICE_UNAVAILABLE;
3000 disc_reason = "NCP: no NCPs available";
3001 break;
3002 case 19: // ncp: failure to converge on acceptable address
3003 disc_cause = TERM_SERVICE_UNAVAILABLE;
3004 disc_reason = (dir == 1)
3005 ? "NCP: too many Configure-Naks received from peer"
3006 : "NCP: too many Configure-Naks sent to peer";
3007 break;
3008 case 20: // ncp: user not permitted to use any address
3009 disc_cause = TERM_SERVICE_UNAVAILABLE;
3010 disc_reason = (dir == 1)
3011 ? "NCP: local link address not acceptable to peer"
3012 : "NCP: remote link address not acceptable";
3013 break;
3014 }
3015 }
3016 break;
3017 default:
3018 {
3019 static char e[] = "unknown AVP 0xXXXX";
3020 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3021 fatal = flags;
3022 result = 2; // general error
3023 error = 8; // unknown mandatory AVP
3024 sprintf((msg = e) + 14, "%04x", mtype);
3025 continue; // next
3026 }
3027 }
3028 }
3029 // process message
3030 if (fatal & 0x80)
3031 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3032 else
3033 switch (message)
3034 {
3035 case 1: // SCCRQ - Start Control Connection Request
3036 tunnel[t].state = TUNNELOPENING;
3037 LOG(3, s, t, "Received SCCRQ\n");
3038 if (main_quit != QUIT_SHUTDOWN)
3039 {
3040 LOG(3, s, t, "sending SCCRP\n");
3041 controlt *c = controlnew(2); // sending SCCRP
3042 control16(c, 2, version, 1); // protocol version
3043 control32(c, 3, 3, 1); // framing
3044 controls(c, 7, hostname, 1); // host name
3045 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
3046 control16(c, 9, t, 1); // assigned tunnel
3047 controladd(c, 0, t); // send the resply
3048 }
3049 else
3050 {
3051 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3052 }
3053 break;
3054 case 2: // SCCRP
3055 tunnel[t].state = TUNNELOPEN;
3056 tunnel[t].lastrec = time_now;
3057 #ifdef LAC
3058 LOG(3, s, t, "Received SCCRP\n");
3059 if (main_quit != QUIT_SHUTDOWN)
3060 {
3061 if (tunnel[t].isremotelns && chapresponse)
3062 {
3063 hasht hash;
3064
3065 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3066 // check authenticator
3067 if (memcmp(hash, chapresponse, 16) == 0)
3068 {
3069 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3070 controlt *c = controlnew(3); // sending SCCCN
3071 controls(c, 7, hostname, 1); // host name
3072 controls(c, 8, Vendor_name, 1); // Vendor name
3073 control16(c, 2, version, 1); // protocol version
3074 control32(c, 3, 3, 1); // framing Capabilities
3075 control16(c, 9, t, 1); // assigned tunnel
3076 controladd(c, 0, t); // send
3077 }
3078 else
3079 {
3080 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3081 }
3082 }
3083 }
3084 else
3085 {
3086 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3087 }
3088 #endif /* LAC */
3089 break;
3090 case 3: // SCCN
3091 LOG(3, s, t, "Received SCCN\n");
3092 tunnel[t].state = TUNNELOPEN;
3093 tunnel[t].lastrec = time_now;
3094 controlnull(t); // ack
3095 break;
3096 case 4: // StopCCN
3097 LOG(3, s, t, "Received StopCCN\n");
3098 controlnull(t); // ack
3099 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3100 break;
3101 case 6: // HELLO
3102 LOG(3, s, t, "Received HELLO\n");
3103 controlnull(t); // simply ACK
3104 break;
3105 case 7: // OCRQ
3106 // TBA
3107 LOG(3, s, t, "Received OCRQ\n");
3108 break;
3109 case 8: // OCRO
3110 // TBA
3111 LOG(3, s, t, "Received OCRO\n");
3112 break;
3113 case 9: // OCCN
3114 // TBA
3115 LOG(3, s, t, "Received OCCN\n");
3116 break;
3117 case 10: // ICRQ
3118 LOG(3, s, t, "Received ICRQ\n");
3119 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3120 {
3121 controlt *c = controlnew(11); // ICRP
3122
3123 LOG(3, s, t, "Sending ICRP\n");
3124
3125 s = sessionfree;
3126 sessionfree = session[s].next;
3127 memset(&session[s], 0, sizeof(session[s]));
3128
3129 if (s > config->cluster_highest_sessionid)
3130 config->cluster_highest_sessionid = s;
3131
3132 session[s].opened = time_now;
3133 session[s].tunnel = t;
3134 session[s].far = asession;
3135 session[s].last_packet = session[s].last_data = time_now;
3136 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3137 control16(c, 14, s, 1); // assigned session
3138 controladd(c, asession, t); // send the reply
3139
3140 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3141 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3142
3143 session[s].ppp.phase = Establish;
3144 session[s].ppp.lcp = Starting;
3145
3146 STAT(session_created);
3147 break;
3148 }
3149
3150 {
3151 controlt *c = controlnew(14); // CDN
3152 LOG(3, s, t, "Sending CDN\n");
3153 if (!sessionfree)
3154 {
3155 STAT(session_overflow);
3156 LOG(1, 0, t, "No free sessions\n");
3157 control16(c, 1, 4, 0); // temporary lack of resources
3158 }
3159 else
3160 control16(c, 1, 2, 7); // shutting down, try another
3161
3162 controladd(c, asession, t); // send the message
3163 }
3164 return;
3165 case 11: // ICRP
3166 #ifdef LAC
3167 LOG(3, s, t, "Received ICRP\n");
3168 if (session[s].forwardtosession)
3169 {
3170 controlt *c = controlnew(12); // ICCN
3171
3172 session[s].opened = time_now;
3173 session[s].tunnel = t;
3174 session[s].far = asession;
3175 session[s].last_packet = session[s].last_data = time_now;
3176
3177 control32(c, 19, 1, 1); // Framing Type
3178 control32(c, 24, 10000000, 1); // Tx Connect Speed
3179 controladd(c, asession, t); // send the message
3180 LOG(3, s, t, "Sending ICCN\n");
3181 }
3182 #endif /* LAC */
3183 break;
3184 case 12: // ICCN
3185 LOG(3, s, t, "Received ICCN\n");
3186 if (amagic == 0) amagic = time_now;
3187 session[s].magic = amagic; // set magic number
3188 session[s].flags = aflags; // set flags received
3189 session[s].mru = PPPoE_MRU; // default
3190 controlnull(t); // ack
3191
3192 // start LCP
3193 sess_local[s].lcp_authtype = config->radius_authprefer;
3194 sess_local[s].ppp_mru = MRU;
3195
3196 // Set multilink options before sending initial LCP packet
3197 sess_local[s].mp_mrru = 1614;
3198 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3199
3200 sendlcp(s, t);
3201 change_state(s, lcp, RequestSent);
3202 break;
3203
3204 case 14: // CDN
3205 LOG(3, s, t, "Received CDN\n");
3206 controlnull(t); // ack
3207 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3208 break;
3209 case 0xFFFF:
3210 LOG(1, s, t, "Missing message type\n");
3211 break;
3212 default:
3213 STAT(tunnel_rx_errors);
3214 if (mandatory)
3215 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3216 else
3217 LOG(1, s, t, "Unknown message type %u\n", message);
3218 break;
3219 }
3220 if (chapresponse) free(chapresponse);
3221 cluster_send_tunnel(t);
3222 }
3223 else
3224 {
3225 LOG(4, s, t, " Got a ZLB ack\n");
3226 }
3227 }
3228 else
3229 { // data
3230 uint16_t proto;
3231
3232 LOG_HEX(5, "Receive Tunnel Data", p, l);
3233 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3234 { // HDLC address header, discard
3235 p += 2;
3236 l -= 2;
3237 }
3238 if (l < 2)
3239 {
3240 LOG(1, s, t, "Short ppp length %d\n", l);
3241 STAT(tunnel_rx_errors);
3242 return;
3243 }
3244 if (*p & 1)
3245 {
3246 proto = *p++;
3247 l--;
3248 }
3249 else
3250 {
3251 proto = ntohs(*(uint16_t *) p);
3252 p += 2;
3253 l -= 2;
3254 }
3255
3256 #ifdef LAC
3257 if (session[s].forwardtosession)
3258 {
3259 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3260 // Forward to LAC/BAS or Remote LNS session
3261 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port);
3262 return;
3263 }
3264 else if (config->auth_tunnel_change_addr_src)
3265 {
3266 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3267 tunnel[t].port == ntohs(addr->sin_port))
3268 {
3269 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3270 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3271 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3272
3273 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3274 }
3275 }
3276 #endif /* LAC */
3277
3278 if (s && !session[s].opened) // Is something wrong??
3279 {
3280 if (!config->cluster_iam_master)
3281 {
3282 // Pass it off to the master to deal with..
3283 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3284 return;
3285 }
3286
3287 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3288 STAT(tunnel_rx_errors);
3289 return;
3290 }
3291
3292 if (proto == PPPPAP)
3293 {
3294 session[s].last_packet = time_now;
3295 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3296 processpap(s, t, p, l);
3297 }
3298 else if (proto == PPPCHAP)
3299 {
3300 session[s].last_packet = time_now;
3301 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3302 processchap(s, t, p, l);
3303 }
3304 else if (proto == PPPLCP)
3305 {
3306 session[s].last_packet = time_now;
3307 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3308 processlcp(s, t, p, l);
3309 }
3310 else if (proto == PPPIPCP)
3311 {
3312 session[s].last_packet = time_now;
3313 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3314 processipcp(s, t, p, l);
3315 }
3316 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3317 {
3318 session[s].last_packet = time_now;
3319 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3320 processipv6cp(s, t, p, l);
3321 }
3322 else if (proto == PPPCCP)
3323 {
3324 session[s].last_packet = time_now;
3325 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3326 processccp(s, t, p, l);
3327 }
3328 else if (proto == PPPIP)
3329 {
3330 if (session[s].die)
3331 {
3332 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3333 return; // closing session, PPP not processed
3334 }
3335
3336 session[s].last_packet = session[s].last_data = time_now;
3337 if (session[s].walled_garden && !config->cluster_iam_master)
3338 {
3339 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3340 return;
3341 }
3342
3343 processipin(s, t, p, l);
3344 }
3345 else if (proto == PPPMP)
3346 {
3347 if (session[s].die)
3348 {
3349 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3350 return; // closing session, PPP not processed
3351 }
3352
3353 session[s].last_packet = session[s].last_data = time_now;
3354 if (!config->cluster_iam_master)
3355 {
3356 // The fragments reconstruction is managed by the Master.
3357 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3358 return;
3359 }
3360
3361 processmpin(s, t, p, l);
3362 }
3363 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3364 {
3365 if (session[s].die)
3366 {
3367 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3368 return; // closing session, PPP not processed
3369 }
3370
3371 session[s].last_packet = session[s].last_data = time_now;
3372 if (session[s].walled_garden && !config->cluster_iam_master)
3373 {
3374 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3375 return;
3376 }
3377
3378 processipv6in(s, t, p, l);
3379 }
3380 else if (session[s].ppp.lcp == Opened)
3381 {
3382 session[s].last_packet = time_now;
3383 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3384 protoreject(s, t, p, l, proto);
3385 }
3386 else
3387 {
3388 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3389 proto, ppp_state(session[s].ppp.lcp));
3390 }
3391 }
3392 }
3393
3394 // read and process packet on tun
3395 // (i.e. this routine writes to buf[-8]).
3396 static void processtun(uint8_t * buf, int len)
3397 {
3398 LOG_HEX(5, "Receive TUN Data", buf, len);
3399 STAT(tun_rx_packets);
3400 INC_STAT(tun_rx_bytes, len);
3401
3402 CSTAT(processtun);
3403
3404 eth_rx_pkt++;
3405 eth_rx += len;
3406 if (len < 22)
3407 {
3408 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3409 STAT(tun_rx_errors);
3410 return;
3411 }
3412
3413 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3414 processipout(buf, len);
3415 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3416 && config->ipv6_prefix.s6_addr[0])
3417 processipv6out(buf, len);
3418
3419 // Else discard.
3420 }
3421
3422 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3423 // that we look at the whole of the tunnel, radius and session tables
3424 // every second
3425 static void regular_cleanups(double period)
3426 {
3427 // Next tunnel, radius and session to check for actions on.
3428 static tunnelidt t = 0;
3429 static int r = 0;
3430 static sessionidt s = 0;
3431
3432 int t_actions = 0;
3433 int r_actions = 0;
3434 int s_actions = 0;
3435
3436 int t_slice;
3437 int r_slice;
3438 int s_slice;
3439
3440 int i;
3441 int a;
3442
3443 // divide up tables into slices based on the last run
3444 t_slice = config->cluster_highest_tunnelid * period;
3445 r_slice = (MAXRADIUS - 1) * period;
3446 s_slice = config->cluster_highest_sessionid * period;
3447
3448 if (t_slice < 1)
3449 t_slice = 1;
3450 else if (t_slice > config->cluster_highest_tunnelid)
3451 t_slice = config->cluster_highest_tunnelid;
3452
3453 if (r_slice < 1)
3454 r_slice = 1;
3455 else if (r_slice > (MAXRADIUS - 1))
3456 r_slice = MAXRADIUS - 1;
3457
3458 if (s_slice < 1)
3459 s_slice = 1;
3460 else if (s_slice > config->cluster_highest_sessionid)
3461 s_slice = config->cluster_highest_sessionid;
3462
3463 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3464
3465 for (i = 0; i < t_slice; i++)
3466 {
3467 t++;
3468 if (t > config->cluster_highest_tunnelid)
3469 t = 1;
3470
3471 if (t == TUNNEL_ID_PPPOE)
3472 continue;
3473
3474 // check for expired tunnels
3475 if (tunnel[t].die && tunnel[t].die <= TIME)
3476 {
3477 STAT(tunnel_timeout);
3478 tunnelkill(t, "Expired");
3479 t_actions++;
3480 continue;
3481 }
3482 // check for message resend
3483 if (tunnel[t].retry && tunnel[t].controlc)
3484 {
3485 // resend pending messages as timeout on reply
3486 if (tunnel[t].retry <= TIME)
3487 {
3488 controlt *c = tunnel[t].controls;
3489 uint16_t w = tunnel[t].window;
3490 tunnel[t].try++; // another try
3491 if (tunnel[t].try > 5)
3492 tunnelkill(t, "Timeout on control message"); // game over
3493 else
3494 while (c && w--)
3495 {
3496 tunnelsend(c->buf, c->length, t);
3497 c = c->next;
3498 }
3499
3500 t_actions++;
3501 }
3502 }
3503 // Send hello
3504 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3505 {
3506 if (!config->disable_sending_hello)
3507 {
3508 controlt *c = controlnew(6); // sending HELLO
3509 controladd(c, 0, t); // send the message
3510 LOG(3, 0, t, "Sending HELLO message\n");
3511 t_actions++;
3512 }
3513 }
3514
3515 // Check for tunnel changes requested from the CLI
3516 if ((a = cli_tunnel_actions[t].action))
3517 {
3518 cli_tunnel_actions[t].action = 0;
3519 if (a & CLI_TUN_KILL)
3520 {
3521 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3522 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3523 t_actions++;
3524 }
3525 }
3526 }
3527
3528 for (i = 0; i < r_slice; i++)
3529 {
3530 r++;
3531 if (r >= MAXRADIUS)
3532 r = 1;
3533
3534 if (!radius[r].state)
3535 continue;
3536
3537 if (radius[r].retry <= TIME)
3538 {
3539 radiusretry(r);
3540 r_actions++;
3541 }
3542 }
3543
3544 for (i = 0; i < s_slice; i++)
3545 {
3546 s++;
3547 if (s > config->cluster_highest_sessionid)
3548 s = 1;
3549
3550 if (!session[s].opened) // Session isn't in use
3551 continue;
3552
3553 // check for expired sessions
3554 if (session[s].die)
3555 {
3556 if (session[s].die <= TIME)
3557 {
3558 sessionkill(s, "Expired");
3559 s_actions++;
3560 }
3561 continue;
3562 }
3563
3564 // PPP timeouts
3565 if (sess_local[s].lcp.restart <= time_now)
3566 {
3567 int next_state = session[s].ppp.lcp;
3568 switch (session[s].ppp.lcp)
3569 {
3570 case RequestSent:
3571 case AckReceived:
3572 next_state = RequestSent;
3573
3574 case AckSent:
3575 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3576 {
3577 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3578 sendlcp(s, session[s].tunnel);
3579 change_state(s, lcp, next_state);
3580 }
3581 else
3582 {
3583 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3584 STAT(session_timeout);
3585 }
3586
3587 s_actions++;
3588 }
3589
3590 if (session[s].die)
3591 continue;
3592 }
3593
3594 if (sess_local[s].ipcp.restart <= time_now)
3595 {
3596 int next_state = session[s].ppp.ipcp;
3597 switch (session[s].ppp.ipcp)
3598 {
3599 case RequestSent:
3600 case AckReceived:
3601 next_state = RequestSent;
3602
3603 case AckSent:
3604 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3605 {
3606 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3607 sendipcp(s, session[s].tunnel);
3608 change_state(s, ipcp, next_state);
3609 }
3610 else
3611 {
3612 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3613 STAT(session_timeout);
3614 }
3615
3616 s_actions++;
3617 }
3618
3619 if (session[s].die)
3620 continue;
3621 }
3622
3623 if (sess_local[s].ipv6cp.restart <= time_now)
3624 {
3625 int next_state = session[s].ppp.ipv6cp;
3626 switch (session[s].ppp.ipv6cp)
3627 {
3628 case RequestSent:
3629 case AckReceived:
3630 next_state = RequestSent;
3631
3632 case AckSent:
3633 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3634 {
3635 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3636 sendipv6cp(s, session[s].tunnel);
3637 change_state(s, ipv6cp, next_state);
3638 }
3639 else
3640 {
3641 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3642 change_state(s, ipv6cp, Stopped);
3643 }
3644
3645 s_actions++;
3646 }
3647 }
3648
3649 if (sess_local[s].ccp.restart <= time_now)
3650 {
3651 int next_state = session[s].ppp.ccp;
3652 switch (session[s].ppp.ccp)
3653 {
3654 case RequestSent:
3655 case AckReceived:
3656 next_state = RequestSent;
3657
3658 case AckSent:
3659 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3660 {
3661 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3662 sendccp(s, session[s].tunnel);
3663 change_state(s, ccp, next_state);
3664 }
3665 else
3666 {
3667 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3668 change_state(s, ccp, Stopped);
3669 }
3670
3671 s_actions++;
3672 }
3673 }
3674
3675 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3676 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3677 {
3678 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3679 STAT(session_timeout);
3680 s_actions++;
3681 continue;
3682 }
3683
3684 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3685 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3686 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3687 {
3688 uint8_t b[MAXETHER];
3689
3690 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3691 if (!q) continue;
3692
3693 *q = EchoReq;
3694 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3695 *(uint16_t *)(q + 2) = htons(8); // Length
3696 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3697
3698 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3699 (int)(time_now - session[s].last_packet));
3700
3701 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3702 sess_local[s].last_echo = time_now;
3703 s_actions++;
3704 }
3705
3706 // Drop sessions who have reached session_timeout seconds
3707 if (session[s].session_timeout)
3708 {
3709 bundleidt bid = session[s].bundle;
3710 if (bid)
3711 {
3712 if (time_now - bundle[bid].last_check >= 1)
3713 {
3714 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3715 bundle[bid].last_check = time_now;
3716 if (bundle[bid].online_time >= session[s].session_timeout)
3717 {
3718 int ses;
3719 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3720 {
3721 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3722 s_actions++;
3723 continue;
3724 }
3725 }
3726 }
3727 }
3728 else if (time_now - session[s].opened >= session[s].session_timeout)
3729 {
3730 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3731 s_actions++;
3732 continue;
3733 }
3734 }
3735
3736 // Drop sessions who have reached idle_timeout seconds
3737 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3738 {
3739 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3740 STAT(session_timeout);
3741 s_actions++;
3742 continue;
3743 }
3744
3745 // Check for actions requested from the CLI
3746 if ((a = cli_session_actions[s].action))
3747 {
3748 int send = 0;
3749
3750 cli_session_actions[s].action = 0;
3751 if (a & CLI_SESS_KILL)
3752 {
3753 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3754 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3755 a = 0; // dead, no need to check for other actions
3756 s_actions++;
3757 }
3758
3759 if (a & CLI_SESS_NOSNOOP)
3760 {
3761 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3762 session[s].snoop_ip = 0;
3763 session[s].snoop_port = 0;
3764 s_actions++;
3765 send++;
3766 }
3767 else if (a & CLI_SESS_SNOOP)
3768 {
3769 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3770 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3771 cli_session_actions[s].snoop_port);
3772
3773 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3774 session[s].snoop_port = cli_session_actions[s].snoop_port;
3775 s_actions++;
3776 send++;
3777 }
3778
3779 if (a & CLI_SESS_NOTHROTTLE)
3780 {
3781 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3782 throttle_session(s, 0, 0);
3783 s_actions++;
3784 send++;
3785 }
3786 else if (a & CLI_SESS_THROTTLE)
3787 {
3788 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3789 cli_session_actions[s].throttle_in,
3790 cli_session_actions[s].throttle_out);
3791
3792 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3793 s_actions++;
3794 send++;
3795 }
3796
3797 if (a & CLI_SESS_NOFILTER)
3798 {
3799 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3800 filter_session(s, 0, 0);
3801 s_actions++;
3802 send++;
3803 }
3804 else if (a & CLI_SESS_FILTER)
3805 {
3806 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3807 cli_session_actions[s].filter_in,
3808 cli_session_actions[s].filter_out);
3809
3810 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3811 s_actions++;
3812 send++;
3813 }
3814
3815 if (send)
3816 cluster_send_session(s);
3817 }
3818
3819 // RADIUS interim accounting
3820 if (config->radius_accounting && config->radius_interim > 0
3821 && session[s].ip && !session[s].walled_garden
3822 && !sess_local[s].radius // RADIUS already in progress
3823 && time_now - sess_local[s].last_interim >= config->radius_interim
3824 && session[s].flags & SESSION_STARTED)
3825 {
3826 int rad = radiusnew(s);
3827 if (!rad)
3828 {
3829 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3830 STAT(radius_overflow);
3831 continue;
3832 }
3833
3834 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3835 session[s].user, session[s].unique_id);
3836
3837 radiussend(rad, RADIUSINTERIM);
3838 sess_local[s].last_interim = time_now;
3839 s_actions++;
3840 }
3841 }
3842
3843 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3844 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3845 }
3846
3847 //
3848 // Are we in the middle of a tunnel update, or radius
3849 // requests??
3850 //
3851 static int still_busy(void)
3852 {
3853 int i;
3854 static clockt last_talked = 0;
3855 static clockt start_busy_wait = 0;
3856
3857 #ifdef BGP
3858 static time_t stopped_bgp = 0;
3859 if (bgp_configured)
3860 {
3861 if (!stopped_bgp)
3862 {
3863 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3864
3865 for (i = 0; i < BGP_NUM_PEERS; i++)
3866 if (bgp_peers[i].state == Established)
3867 bgp_stop(&bgp_peers[i]);
3868
3869 stopped_bgp = time_now;
3870
3871 if (!config->cluster_iam_master)
3872 {
3873 // we don't want to become master
3874 cluster_send_ping(0);
3875
3876 return 1;
3877 }
3878 }
3879
3880 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3881 return 1;
3882 }
3883 #endif /* BGP */
3884
3885 if (!config->cluster_iam_master)
3886 return 0;
3887
3888 if (main_quit == QUIT_SHUTDOWN)
3889 {
3890 static int dropped = 0;
3891 if (!dropped)
3892 {
3893 int i;
3894
3895 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3896 for (i = 1; i < MAXTUNNEL; i++)
3897 if (tunnel[i].ip || tunnel[i].state)
3898 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3899
3900 dropped = 1;
3901 }
3902 }
3903
3904 if (start_busy_wait == 0)
3905 start_busy_wait = TIME;
3906
3907 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3908 {
3909 if (!tunnel[i].controlc)
3910 continue;
3911
3912 if (last_talked != TIME)
3913 {
3914 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3915 last_talked = TIME;
3916 }
3917 return 1;
3918 }
3919
3920 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3921 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3922 {
3923 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3924 return 0;
3925 }
3926
3927 for (i = 1; i < MAXRADIUS; i++)
3928 {
3929 if (radius[i].state == RADIUSNULL)
3930 continue;
3931 if (radius[i].state == RADIUSWAIT)
3932 continue;
3933
3934 if (last_talked != TIME)
3935 {
3936 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3937 last_talked = TIME;
3938 }
3939 return 1;
3940 }
3941
3942 return 0;
3943 }
3944
3945 #ifdef HAVE_EPOLL
3946 # include <sys/epoll.h>
3947 #else
3948 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3949 # include "fake_epoll.h"
3950 #endif
3951
3952 #ifdef LAC
3953 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac, pppoedisc, pppoesess
3954 #define BASE_FDS 10
3955 #else
3956 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, pppoedisc, pppoesess
3957 #define BASE_FDS 9
3958 #endif
3959
3960 // additional polled fds
3961 #ifdef BGP
3962 # define EXTRA_FDS BGP_NUM_PEERS
3963 #else
3964 # define EXTRA_FDS 0
3965 #endif
3966
3967 // main loop - gets packets on tun or udp and processes them
3968 static void mainloop(void)
3969 {
3970 int i;
3971 uint8_t buf[65536];
3972 uint8_t *p = buf + 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3973 // and the forwarded pppoe session
3974 int size_bufp = sizeof(buf) - 32;
3975 clockt next_cluster_ping = 0; // send initial ping immediately
3976 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3977 int maxevent = sizeof(events)/sizeof(*events);
3978
3979 if ((epollfd = epoll_create(maxevent)) < 0)
3980 {
3981 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3982 exit(1);
3983 }
3984
3985 #ifdef LAC
3986 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",
3987 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
3988 #else
3989 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d, pppoefd=%d, pppoesessfd=%d\n",
3990 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, pppoediscfd, pppoesessfd);
3991 #endif
3992
3993 /* setup our fds to poll for input */
3994 {
3995 static struct event_data d[BASE_FDS];
3996 struct epoll_event e;
3997
3998 e.events = EPOLLIN;
3999 i = 0;
4000
4001 if (clifd >= 0)
4002 {
4003 d[i].type = FD_TYPE_CLI;
4004 e.data.ptr = &d[i++];
4005 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4006 }
4007
4008 d[i].type = FD_TYPE_CLUSTER;
4009 e.data.ptr = &d[i++];
4010 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4011
4012 d[i].type = FD_TYPE_TUN;
4013 e.data.ptr = &d[i++];
4014 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4015
4016 d[i].type = FD_TYPE_UDP;
4017 e.data.ptr = &d[i++];
4018 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
4019
4020 d[i].type = FD_TYPE_CONTROL;
4021 e.data.ptr = &d[i++];
4022 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4023
4024 d[i].type = FD_TYPE_DAE;
4025 e.data.ptr = &d[i++];
4026 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4027
4028 d[i].type = FD_TYPE_NETLINK;
4029 e.data.ptr = &d[i++];
4030 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4031
4032 #ifdef LAC
4033 d[i].type = FD_TYPE_UDPLAC;
4034 e.data.ptr = &d[i++];
4035 epoll_ctl(epollfd, EPOLL_CTL_ADD, udplacfd, &e);
4036 #endif
4037
4038 d[i].type = FD_TYPE_PPPOEDISC;
4039 e.data.ptr = &d[i++];
4040 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4041
4042 d[i].type = FD_TYPE_PPPOESESS;
4043 e.data.ptr = &d[i++];
4044 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4045 }
4046
4047 #ifdef BGP
4048 signal(SIGPIPE, SIG_IGN);
4049 bgp_setup(config->as_number);
4050 if (config->bind_address)
4051 bgp_add_route(config->bind_address, 0xffffffff);
4052
4053 for (i = 0; i < BGP_NUM_PEERS; i++)
4054 {
4055 if (config->neighbour[i].name[0])
4056 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4057 config->neighbour[i].as, config->neighbour[i].keepalive,
4058 config->neighbour[i].hold, config->neighbour[i].update_source,
4059 0); /* 0 = routing disabled */
4060 }
4061 #endif /* BGP */
4062
4063 while (!main_quit || still_busy())
4064 {
4065 int more = 0;
4066 int n;
4067
4068
4069 if (main_reload)
4070 {
4071 main_reload = 0;
4072 read_config_file();
4073 config->reload_config++;
4074 }
4075
4076 if (config->reload_config)
4077 {
4078 config->reload_config = 0;
4079 update_config();
4080 }
4081
4082 #ifdef BGP
4083 bgp_set_poll();
4084 #endif /* BGP */
4085
4086 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4087 STAT(select_called);
4088
4089 TIME = now(NULL);
4090 if (n < 0)
4091 {
4092 if (errno == EINTR ||
4093 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4094 continue;
4095
4096 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4097 break; // exit
4098 }
4099
4100 if (n)
4101 {
4102 struct sockaddr_in addr;
4103 struct in_addr local;
4104 socklen_t alen;
4105 int c, s;
4106 int udp_ready = 0;
4107 #ifdef LAC
4108 int udplac_ready = 0;
4109 int udplac_pkts = 0;
4110 #endif
4111 int pppoesess_ready = 0;
4112 int pppoesess_pkts = 0;
4113 int tun_ready = 0;
4114 int cluster_ready = 0;
4115 int udp_pkts = 0;
4116 int tun_pkts = 0;
4117 int cluster_pkts = 0;
4118 #ifdef BGP
4119 uint32_t bgp_events[BGP_NUM_PEERS];
4120 memset(bgp_events, 0, sizeof(bgp_events));
4121 #endif /* BGP */
4122
4123 for (c = n, i = 0; i < c; i++)
4124 {
4125 struct event_data *d = events[i].data.ptr;
4126
4127 switch (d->type)
4128 {
4129 case FD_TYPE_CLI: // CLI connections
4130 {
4131 int cli;
4132
4133 alen = sizeof(addr);
4134 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4135 {
4136 cli_do(cli);
4137 close(cli);
4138 }
4139 else
4140 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4141
4142 n--;
4143 break;
4144 }
4145
4146 // these are handled below, with multiple interleaved reads
4147 case FD_TYPE_CLUSTER: cluster_ready++; break;
4148 case FD_TYPE_TUN: tun_ready++; break;
4149 case FD_TYPE_UDP: udp_ready++; break;
4150 #ifdef LAC
4151 case FD_TYPE_UDPLAC: udplac_ready++; break;
4152 #endif
4153 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4154
4155 case FD_TYPE_PPPOEDISC: // pppoe discovery
4156 s = read(pppoediscfd, p, size_bufp);
4157 if (s > 0) process_pppoe_disc(p, s);
4158 n--;
4159 break;
4160
4161 case FD_TYPE_CONTROL: // nsctl commands
4162 alen = sizeof(addr);
4163 s = recvfromto(controlfd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4164 if (s > 0) processcontrol(p, s, &addr, alen, &local);
4165 n--;
4166 break;
4167
4168 case FD_TYPE_DAE: // DAE requests
4169 alen = sizeof(addr);
4170 s = recvfromto(daefd, p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4171 if (s > 0) processdae(p, s, &addr, alen, &local);
4172 n--;
4173 break;
4174
4175 case FD_TYPE_RADIUS: // RADIUS response
4176 alen = sizeof(addr);
4177 s = recvfrom(radfds[d->index], p, size_bufp, MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4178 if (s >= 0 && config->cluster_iam_master)
4179 {
4180 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4181 addr.sin_addr.s_addr == config->radiusserver[1])
4182 processrad(p, s, d->index);
4183 else
4184 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4185 fmtaddr(addr.sin_addr.s_addr, 0));
4186 }
4187
4188 n--;
4189 break;
4190
4191 #ifdef BGP
4192 case FD_TYPE_BGP:
4193 bgp_events[d->index] = events[i].events;
4194 n--;
4195 break;
4196 #endif /* BGP */
4197
4198 case FD_TYPE_NETLINK:
4199 {
4200 struct nlmsghdr *nh = (struct nlmsghdr *)p;
4201 s = netlink_recv(p, size_bufp);
4202 if (nh->nlmsg_type == NLMSG_ERROR)
4203 {
4204 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4205 if (errmsg->error)
4206 {
4207 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4208 {
4209 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4210 exit(1);
4211 }
4212 else
4213
4214 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4215 }
4216 // else it's a ack
4217 }
4218 else
4219 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);
4220 n--;
4221 break;
4222 }
4223
4224 default:
4225 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4226 }
4227 }
4228
4229 #ifdef BGP
4230 bgp_process(bgp_events);
4231 #endif /* BGP */
4232
4233 for (c = 0; n && c < config->multi_read_count; c++)
4234 {
4235 // L2TP
4236 if (udp_ready)
4237 {
4238 alen = sizeof(addr);
4239 if ((s = recvfrom(udpfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4240 {
4241 processudp(p, s, &addr);
4242 udp_pkts++;
4243 }
4244 else
4245 {
4246 udp_ready = 0;
4247 n--;
4248 }
4249 }
4250 #ifdef LAC
4251 // L2TP REMOTE LNS
4252 if (udplac_ready)
4253 {
4254 alen = sizeof(addr);
4255 if ((s = recvfrom(udplacfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4256 {
4257 if (!config->disable_lac_func)
4258 processudp(p, s, &addr);
4259
4260 udplac_pkts++;
4261 }
4262 else
4263 {
4264 udplac_ready = 0;
4265 n--;
4266 }
4267 }
4268 #endif
4269 // incoming IP
4270 if (tun_ready)
4271 {
4272 if ((s = read(tunfd, p, size_bufp)) > 0)
4273 {
4274 processtun(p, s);
4275 tun_pkts++;
4276 }
4277 else
4278 {
4279 tun_ready = 0;
4280 n--;
4281 }
4282 }
4283
4284 // pppoe session
4285 if (pppoesess_ready)
4286 {
4287 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4288 {
4289 process_pppoe_sess(p, s);
4290 pppoesess_pkts++;
4291 }
4292 else
4293 {
4294 pppoesess_ready = 0;
4295 n--;
4296 }
4297 }
4298
4299 // cluster
4300 if (cluster_ready)
4301 {
4302 alen = sizeof(addr);
4303 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4304 {
4305 processcluster(p, s, addr.sin_addr.s_addr);
4306 cluster_pkts++;
4307 }
4308 else
4309 {
4310 cluster_ready = 0;
4311 n--;
4312 }
4313 }
4314 }
4315
4316 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
4317 STAT(multi_read_used);
4318
4319 if (c >= config->multi_read_count)
4320 {
4321 #ifdef LAC
4322 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster %d rmlns and %d pppoe packets\n",
4323 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, udplac_pkts, pppoesess_pkts);
4324 #else
4325 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4326 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, pppoesess_pkts);
4327 #endif
4328 STAT(multi_read_exceeded);
4329 more++;
4330 }
4331 }
4332 #ifdef BGP
4333 else
4334 /* no event received, but timers could still have expired */
4335 bgp_process_peers_timers();
4336 #endif /* BGP */
4337
4338 if (time_changed)
4339 {
4340 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4341
4342 // Log current traffic stats
4343 snprintf(config->bandwidth, sizeof(config->bandwidth),
4344 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4345 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4346 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4347 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4348
4349 udp_tx = udp_rx = 0;
4350 udp_rx_pkt = eth_rx_pkt = 0;
4351 eth_tx = eth_rx = 0;
4352 time_changed = 0;
4353
4354 if (config->dump_speed)
4355 printf("%s\n", config->bandwidth);
4356
4357 // Update the internal time counter
4358 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4359
4360 {
4361 // Run timer hooks
4362 struct param_timer p = { time_now };
4363 run_plugins(PLUGIN_TIMER, &p);
4364 }
4365 }
4366
4367 // Runs on every machine (master and slaves).
4368 if (next_cluster_ping <= TIME)
4369 {
4370 // Check to see which of the cluster is still alive..
4371
4372 cluster_send_ping(basetime); // Only does anything if we're a slave
4373 cluster_check_master(); // ditto.
4374
4375 cluster_heartbeat(); // Only does anything if we're a master.
4376 cluster_check_slaves(); // ditto.
4377
4378 master_update_counts(); // If we're a slave, send our byte counters to our master.
4379
4380 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4381 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4382 else
4383 next_cluster_ping = TIME + config->cluster_hb_interval;
4384 }
4385
4386 if (!config->cluster_iam_master)
4387 continue;
4388
4389 // Run token bucket filtering queue..
4390 // Only run it every 1/10th of a second.
4391 {
4392 static clockt last_run = 0;
4393 if (last_run != TIME)
4394 {
4395 last_run = TIME;
4396 tbf_run_timer();
4397 }
4398 }
4399
4400 // Handle timeouts, retries etc.
4401 {
4402 static double last_clean = 0;
4403 double this_clean;
4404 double diff;
4405
4406 TIME = now(&this_clean);
4407 diff = this_clean - last_clean;
4408
4409 // Run during idle time (after we've handled
4410 // all incoming packets) or every 1/10th sec
4411 if (!more || diff > 0.1)
4412 {
4413 regular_cleanups(diff);
4414 last_clean = this_clean;
4415 }
4416 }
4417
4418 if (*config->accounting_dir)
4419 {
4420 static clockt next_acct = 0;
4421 static clockt next_shut_acct = 0;
4422
4423 if (next_acct <= TIME)
4424 {
4425 // Dump accounting data
4426 next_acct = TIME + ACCT_TIME;
4427 next_shut_acct = TIME + ACCT_SHUT_TIME;
4428 dump_acct_info(1);
4429 }
4430 else if (next_shut_acct <= TIME)
4431 {
4432 // Dump accounting data for shutdown sessions
4433 next_shut_acct = TIME + ACCT_SHUT_TIME;
4434 if (shut_acct_n)
4435 dump_acct_info(0);
4436 }
4437 }
4438 }
4439
4440 // Are we the master and shutting down??
4441 if (config->cluster_iam_master)
4442 cluster_heartbeat(); // Flush any queued changes..
4443
4444 // Ok. Notify everyone we're shutting down. If we're
4445 // the master, this will force an election.
4446 cluster_send_ping(0);
4447
4448 //
4449 // Important!!! We MUST not process any packets past this point!
4450 LOG(1, 0, 0, "Shutdown complete\n");
4451 }
4452
4453 static void stripdomain(char *host)
4454 {
4455 char *p;
4456
4457 if ((p = strchr(host, '.')))
4458 {
4459 char *domain = 0;
4460 char _domain[1024];
4461
4462 // strip off domain
4463 FILE *resolv = fopen("/etc/resolv.conf", "r");
4464 if (resolv)
4465 {
4466 char buf[1024];
4467 char *b;
4468
4469 while (fgets(buf, sizeof(buf), resolv))
4470 {
4471 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4472 continue;
4473
4474 if (!isspace(buf[6]))
4475 continue;
4476
4477 b = buf + 7;
4478 while (isspace(*b)) b++;
4479
4480 if (*b)
4481 {
4482 char *d = b;
4483 while (*b && !isspace(*b)) b++;
4484 *b = 0;
4485 if (buf[0] == 'd') // domain is canonical
4486 {
4487 domain = d;
4488 break;
4489 }
4490
4491 // first search line
4492 if (!domain)
4493 {
4494 // hold, may be subsequent domain line
4495 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4496 domain = _domain;
4497 }
4498 }
4499 }
4500
4501 fclose(resolv);
4502 }
4503
4504 if (domain)
4505 {
4506 int hl = strlen(host);
4507 int dl = strlen(domain);
4508 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4509 host[hl -dl - 1] = 0;
4510 }
4511 else
4512 {
4513 *p = 0; // everything after first dot
4514 }
4515 }
4516 }
4517
4518 // Init data structures
4519 static void initdata(int optdebug, char *optconfig)
4520 {
4521 int i;
4522
4523 if (!(config = shared_malloc(sizeof(configt))))
4524 {
4525 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4526 exit(1);
4527 }
4528
4529 memset(config, 0, sizeof(configt));
4530 time(&config->start_time);
4531 strncpy(config->config_file, optconfig, strlen(optconfig));
4532 config->debug = optdebug;
4533 config->num_tbfs = MAXTBFS;
4534 config->rl_rate = 28; // 28kbps
4535 config->cluster_mcast_ttl = 1;
4536 config->cluster_master_min_adv = 1;
4537 config->ppp_restart_time = 3;
4538 config->ppp_max_configure = 10;
4539 config->ppp_max_failure = 5;
4540 config->kill_timedout_sessions = 1;
4541 strcpy(config->random_device, RANDOMDEVICE);
4542 // Set default value echo_timeout and idle_echo_timeout
4543 config->echo_timeout = ECHO_TIMEOUT;
4544 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4545
4546 log_stream = stderr;
4547
4548 #ifdef RINGBUFFER
4549 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4550 {
4551 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4552 exit(1);
4553 }
4554 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4555 #endif
4556
4557 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4558 {
4559 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4560 exit(1);
4561 }
4562 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4563 {
4564 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4565 exit(1);
4566 }
4567 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4568 {
4569 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4570 exit(1);
4571 }
4572 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4573 {
4574 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4575 exit(1);
4576 }
4577 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4578 {
4579 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4580 exit(1);
4581 }
4582
4583 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4584 {
4585 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4586 exit(1);
4587 }
4588
4589 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4590 {
4591 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4592 exit(1);
4593 }
4594
4595 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4596 {
4597 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4598 exit(1);
4599 }
4600
4601 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4602 {
4603 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4604 exit(1);
4605 }
4606 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4607
4608 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4609 {
4610 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4611 exit(1);
4612 }
4613 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4614
4615 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4616 {
4617 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4618 exit(1);
4619 }
4620 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4621
4622 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4623 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4624 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4625 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4626 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4627
4628 // Put all the sessions on the free list marked as undefined.
4629 for (i = 1; i < MAXSESSION; i++)
4630 {
4631 session[i].next = i + 1;
4632 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4633 }
4634 session[MAXSESSION - 1].next = 0;
4635 sessionfree = 1;
4636
4637 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4638 for (i = 1; i < MAXTUNNEL; i++)
4639 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4640
4641 for (i = 1; i < MAXBUNDLE; i++) {
4642 bundle[i].state = BUNDLEUNDEF;
4643 }
4644
4645 if (!*hostname)
4646 {
4647 // Grab my hostname unless it's been specified
4648 gethostname(hostname, sizeof(hostname));
4649 stripdomain(hostname);
4650 }
4651
4652 _statistics->start_time = _statistics->last_reset = time(NULL);
4653
4654 #ifdef BGP
4655 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4656 {
4657 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4658 exit(1);
4659 }
4660 #endif /* BGP */
4661
4662 #ifdef LAC
4663 lac_initremotelnsdata();
4664 #endif
4665 }
4666
4667 static int assign_ip_address(sessionidt s)
4668 {
4669 uint32_t i;
4670 int best = -1;
4671 time_t best_time = time_now;
4672 char *u = session[s].user;
4673 char reuse = 0;
4674
4675
4676 CSTAT(assign_ip_address);
4677
4678 for (i = 1; i < ip_pool_size; i++)
4679 {
4680 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4681 continue;
4682
4683 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4684 {
4685 best = i;
4686 reuse = 1;
4687 break;
4688 }
4689
4690 if (ip_address_pool[i].last < best_time)
4691 {
4692 best = i;
4693 if (!(best_time = ip_address_pool[i].last))
4694 break; // never used, grab this one
4695 }
4696 }
4697
4698 if (best < 0)
4699 {
4700 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4701 return 0;
4702 }
4703
4704 session[s].ip = ip_address_pool[best].address;
4705 session[s].ip_pool_index = best;
4706 ip_address_pool[best].assigned = 1;
4707 ip_address_pool[best].last = time_now;
4708 ip_address_pool[best].session = s;
4709 if (session[s].walled_garden)
4710 /* Don't track addresses of users in walled garden (note: this
4711 means that their address isn't "sticky" even if they get
4712 un-gardened). */
4713 ip_address_pool[best].user[0] = 0;
4714 else
4715 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4716
4717 STAT(ip_allocated);
4718 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4719 reuse ? "Reusing" : "Allocating", best);
4720
4721 return 1;
4722 }
4723
4724 static void free_ip_address(sessionidt s)
4725 {
4726 int i = session[s].ip_pool_index;
4727
4728
4729 CSTAT(free_ip_address);
4730
4731 if (!session[s].ip)
4732 return; // what the?
4733
4734 if (i < 0) // Is this actually part of the ip pool?
4735 i = 0;
4736
4737 STAT(ip_freed);
4738 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4739 session[s].ip = 0;
4740 ip_address_pool[i].assigned = 0;
4741 ip_address_pool[i].session = 0;
4742 ip_address_pool[i].last = time_now;
4743 }
4744
4745 //
4746 // Fsck the address pool against the session table.
4747 // Normally only called when we become a master.
4748 //
4749 // This isn't perfect: We aren't keep tracking of which
4750 // users used to have an IP address.
4751 //
4752 void rebuild_address_pool(void)
4753 {
4754 int i;
4755
4756 //
4757 // Zero the IP pool allocation, and build
4758 // a map from IP address to pool index.
4759 for (i = 1; i < MAXIPPOOL; ++i)
4760 {
4761 ip_address_pool[i].assigned = 0;
4762 ip_address_pool[i].session = 0;
4763 if (!ip_address_pool[i].address)
4764 continue;
4765
4766 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4767 }
4768
4769 for (i = 0; i < MAXSESSION; ++i)
4770 {
4771 int ipid;
4772 if (!(session[i].opened && session[i].ip))
4773 continue;
4774
4775 ipid = - lookup_ipmap(htonl(session[i].ip));
4776
4777 if (session[i].ip_pool_index < 0)
4778 {
4779 // Not allocated out of the pool.
4780 if (ipid < 1) // Not found in the pool either? good.
4781 continue;
4782
4783 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4784 i, fmtaddr(session[i].ip, 0), ipid);
4785
4786 // Fall through and process it as part of the pool.
4787 }
4788
4789
4790 if (ipid > MAXIPPOOL || ipid < 0)
4791 {
4792 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4793 ipid = -1;
4794 session[i].ip_pool_index = ipid;
4795 continue;
4796 }
4797
4798 ip_address_pool[ipid].assigned = 1;
4799 ip_address_pool[ipid].session = i;
4800 ip_address_pool[ipid].last = time_now;
4801 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4802 session[i].ip_pool_index = ipid;
4803 cache_ipmap(session[i].ip, i); // Fix the ip map.
4804 }
4805 }
4806
4807 //
4808 // Fix the address pool to match a changed session.
4809 // (usually when the master sends us an update).
4810 static void fix_address_pool(int sid)
4811 {
4812 int ipid;
4813
4814 ipid = session[sid].ip_pool_index;
4815
4816 if (ipid > ip_pool_size)
4817 return; // Ignore it. rebuild_address_pool will fix it up.
4818
4819 if (ip_address_pool[ipid].address != session[sid].ip)
4820 return; // Just ignore it. rebuild_address_pool will take care of it.
4821
4822 ip_address_pool[ipid].assigned = 1;
4823 ip_address_pool[ipid].session = sid;
4824 ip_address_pool[ipid].last = time_now;
4825 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4826 }
4827
4828 //
4829 // Add a block of addresses to the IP pool to hand out.
4830 //
4831 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4832 {
4833 int i;
4834 if (prefixlen == 0)
4835 prefixlen = 32; // Host route only.
4836
4837 addr &= 0xffffffff << (32 - prefixlen);
4838
4839 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4840 return ;
4841
4842 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4843 {
4844 if ((i & 0xff) == 0 || (i&0xff) == 255)
4845 continue; // Skip 0 and broadcast addresses.
4846
4847 ip_address_pool[ip_pool_size].address = i;
4848 ip_address_pool[ip_pool_size].assigned = 0;
4849 ++ip_pool_size;
4850 if (ip_pool_size >= MAXIPPOOL)
4851 {
4852 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4853 return;
4854 }
4855 }
4856 }
4857
4858 // Initialize the IP address pool
4859 static void initippool()
4860 {
4861 FILE *f;
4862 char *p;
4863 char buf[4096];
4864 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4865
4866 if (!(f = fopen(IPPOOLFILE, "r")))
4867 {
4868 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4869 exit(1);
4870 }
4871
4872 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4873 {
4874 char *pool = buf;
4875 buf[4095] = 0; // Force it to be zero terminated/
4876
4877 if (*buf == '#' || *buf == '\n')
4878 continue; // Skip comments / blank lines
4879 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4880 if ((p = (char *)strchr(buf, ':')))
4881 {
4882 in_addr_t src;
4883 *p = '\0';
4884 src = inet_addr(buf);
4885 if (src == INADDR_NONE)
4886 {
4887 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4888 exit(1);
4889 }
4890 // This entry is for a specific IP only
4891 if (src != config->bind_address)
4892 continue;
4893 *p = ':';
4894 pool = p+1;
4895 }
4896 if ((p = (char *)strchr(pool, '/')))
4897 {
4898 // It's a range
4899 int numbits = 0;
4900 in_addr_t start = 0;
4901
4902 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4903 *p++ = 0;
4904 if (!*p || !(numbits = atoi(p)))
4905 {
4906 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4907 continue;
4908 }
4909 start = ntohl(inet_addr(pool));
4910
4911 // Add a static route for this pool
4912 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4913 fmtaddr(htonl(start), 0), numbits);
4914
4915 routeset(0, start, numbits, 0, 1);
4916
4917 add_to_ip_pool(start, numbits);
4918 }
4919 else
4920 {
4921 // It's a single ip address
4922 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4923 }
4924 }
4925 fclose(f);
4926 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4927 }
4928
4929 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4930 {
4931 struct sockaddr_in snoop_addr = {0};
4932 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4933 return;
4934
4935 snoop_addr.sin_family = AF_INET;
4936 snoop_addr.sin_addr.s_addr = destination;
4937 snoop_addr.sin_port = ntohs(port);
4938
4939 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4940 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4941 htons(snoop_addr.sin_port));
4942
4943 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4944 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4945
4946 STAT(packets_snooped);
4947 }
4948
4949 static int dump_session(FILE **f, sessiont *s)
4950 {
4951 #ifdef LAC
4952 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4953 #else
4954 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4955 #endif
4956 return 1;
4957
4958 if (!*f)
4959 {
4960 char filename[1024];
4961 char timestr[64];
4962 time_t now = time(NULL);
4963
4964 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4965 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4966
4967 if (!(*f = fopen(filename, "w")))
4968 {
4969 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4970 return 0;
4971 }
4972
4973 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4974 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4975 "# host: %s\n"
4976 "# endpoint: %s\n"
4977 "# time: %ld\n"
4978 "# uptime: %ld\n"
4979 "# format: username ip qos uptxoctets downrxoctets\n",
4980 hostname,
4981 fmtaddr(config->iftun_address ? config->iftun_address : my_address, 0),
4982 now,
4983 now - basetime);
4984 }
4985
4986 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4987 fprintf(*f, "%s %s %d %u %u\n",
4988 s->user, // username
4989 fmtaddr(htonl(s->ip), 0), // ip
4990 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4991 (uint32_t) s->cin_delta, // uptxoctets
4992 (uint32_t) s->cout_delta); // downrxoctets
4993
4994 s->cin_delta = s->cout_delta = 0;
4995
4996 return 1;
4997 }
4998
4999 static void dump_acct_info(int all)
5000 {
5001 int i;
5002 FILE *f = NULL;
5003
5004
5005 CSTAT(dump_acct_info);
5006
5007 if (shut_acct_n)
5008 {
5009 for (i = 0; i < shut_acct_n; i++)
5010 dump_session(&f, &shut_acct[i]);
5011
5012 shut_acct_n = 0;
5013 }
5014
5015 if (all)
5016 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5017 dump_session(&f, &session[i]);
5018
5019 if (f)
5020 fclose(f);
5021 }
5022
5023 // Main program
5024 int main(int argc, char *argv[])
5025 {
5026 int i;
5027 int optdebug = 0;
5028 char *optconfig = CONFIGFILE;
5029
5030 time(&basetime); // start clock
5031
5032 // scan args
5033 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5034 {
5035 switch (i)
5036 {
5037 case 'd':
5038 if (fork()) exit(0);
5039 setsid();
5040 freopen("/dev/null", "r", stdin);
5041 freopen("/dev/null", "w", stdout);
5042 freopen("/dev/null", "w", stderr);
5043 break;
5044 case 'v':
5045 optdebug++;
5046 break;
5047 case 'c':
5048 optconfig = optarg;
5049 break;
5050 case 'h':
5051 snprintf(hostname, sizeof(hostname), "%s", optarg);
5052 break;
5053 default:
5054 printf("Args are:\n"
5055 "\t-d\t\tDetach from terminal\n"
5056 "\t-c <file>\tConfig file\n"
5057 "\t-h <hostname>\tForce hostname\n"
5058 "\t-v\t\tDebug\n");
5059
5060 return (0);
5061 break;
5062 }
5063 }
5064
5065 // Start the timer routine off
5066 time(&time_now);
5067 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5068
5069 initplugins();
5070 initdata(optdebug, optconfig);
5071
5072 init_cli();
5073 read_config_file();
5074 /* set hostname /after/ having read the config file */
5075 if (*config->hostname)
5076 strcpy(hostname, config->hostname);
5077 cli_init_complete(hostname);
5078 update_config();
5079 init_tbf(config->num_tbfs);
5080
5081 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5082 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5083 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5084 {
5085 struct rlimit rlim;
5086 rlim.rlim_cur = RLIM_INFINITY;
5087 rlim.rlim_max = RLIM_INFINITY;
5088 // Remove the maximum core size
5089 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5090 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5091
5092 // Make core dumps go to /tmp
5093 chdir("/tmp");
5094 }
5095
5096 if (config->scheduler_fifo)
5097 {
5098 int ret;
5099 struct sched_param params = {0};
5100 params.sched_priority = 1;
5101
5102 if (get_nprocs() < 2)
5103 {
5104 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5105 config->scheduler_fifo = 0;
5106 }
5107 else
5108 {
5109 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5110 {
5111 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5112 }
5113 else
5114 {
5115 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5116 config->scheduler_fifo = 0;
5117 }
5118 }
5119 }
5120
5121 initnetlink();
5122
5123 /* Set up the cluster communications port. */
5124 if (cluster_init() < 0)
5125 exit(1);
5126
5127 inittun();
5128 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5129
5130 if (*config->pppoe_if_to_bind)
5131 {
5132 init_pppoe();
5133 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5134 }
5135 initudp();
5136 initrad();
5137 initippool();
5138
5139 // seed prng
5140 {
5141 unsigned seed = time_now ^ getpid();
5142 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5143 srand(seed);
5144 }
5145
5146 signal(SIGHUP, sighup_handler);
5147 signal(SIGCHLD, sigchild_handler);
5148 signal(SIGTERM, shutdown_handler);
5149 signal(SIGINT, shutdown_handler);
5150 signal(SIGQUIT, shutdown_handler);
5151
5152 // Prevent us from getting paged out
5153 if (config->lock_pages)
5154 {
5155 if (!mlockall(MCL_CURRENT))
5156 LOG(1, 0, 0, "Locking pages into memory\n");
5157 else
5158 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5159 }
5160
5161 mainloop();
5162
5163 /* remove plugins (so cleanup code gets run) */
5164 plugins_done();
5165
5166 // Remove the PID file if we wrote it
5167 if (config->wrote_pid && *config->pid_file == '/')
5168 unlink(config->pid_file);
5169
5170 /* kill CLI children */
5171 signal(SIGTERM, SIG_IGN);
5172 kill(0, SIGTERM);
5173 return 0;
5174 }
5175
5176 static void sighup_handler(int sig)
5177 {
5178 main_reload++;
5179 }
5180
5181 static void shutdown_handler(int sig)
5182 {
5183 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5184 }
5185
5186 static void sigchild_handler(int sig)
5187 {
5188 while (waitpid(-1, NULL, WNOHANG) > 0)
5189 ;
5190 }
5191
5192 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5193 {
5194 MD5_CTX ctx;
5195 *challenge_response = NULL;
5196
5197 if (!*config->l2tp_secret)
5198 {
5199 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5200 return;
5201 }
5202
5203 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5204
5205 *challenge_response = calloc(17, 1);
5206
5207 MD5_Init(&ctx);
5208 MD5_Update(&ctx, &id, 1);
5209 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5210 MD5_Update(&ctx, challenge, challenge_length);
5211 MD5_Final(*challenge_response, &ctx);
5212
5213 return;
5214 }
5215
5216 static int facility_value(char *name)
5217 {
5218 int i;
5219 for (i = 0; facilitynames[i].c_name; i++)
5220 {
5221 if (strcmp(facilitynames[i].c_name, name) == 0)
5222 return facilitynames[i].c_val;
5223 }
5224 return 0;
5225 }
5226
5227 static void update_config()
5228 {
5229 int i;
5230 char *p;
5231 static int timeout = 0;
5232 static int interval = 0;
5233
5234 // Update logging
5235 closelog();
5236 syslog_log = 0;
5237 if (log_stream)
5238 {
5239 if (log_stream != stderr)
5240 fclose(log_stream);
5241
5242 log_stream = NULL;
5243 }
5244
5245 if (*config->log_filename)
5246 {
5247 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5248 {
5249 char *p = config->log_filename + 7;
5250 if (*p)
5251 {
5252 openlog("l2tpns", LOG_PID, facility_value(p));
5253 syslog_log = 1;
5254 }
5255 }
5256 else if (strchr(config->log_filename, '/') == config->log_filename)
5257 {
5258 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5259 {
5260 fseek(log_stream, 0, SEEK_END);
5261 setbuf(log_stream, NULL);
5262 }
5263 else
5264 {
5265 log_stream = stderr;
5266 setbuf(log_stream, NULL);
5267 }
5268 }
5269 }
5270 else
5271 {
5272 log_stream = stderr;
5273 setbuf(log_stream, NULL);
5274 }
5275
5276 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5277 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5278
5279 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5280 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5281 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5282
5283 // reset MRU/MSS globals
5284 MRU = config->l2tp_mtu - L2TP_HDRS;
5285 if (MRU > PPPoE_MRU)
5286 MRU = PPPoE_MRU;
5287
5288 MSS = MRU - TCP_HDRS;
5289
5290 // Update radius
5291 config->numradiusservers = 0;
5292 for (i = 0; i < MAXRADSERVER; i++)
5293 if (config->radiusserver[i])
5294 {
5295 config->numradiusservers++;
5296 // Set radius port: if not set, take the port from the
5297 // first radius server. For the first radius server,
5298 // take the #defined default value from l2tpns.h
5299
5300 // test twice, In case someone works with
5301 // a secondary radius server without defining
5302 // a primary one, this will work even then.
5303 if (i > 0 && !config->radiusport[i])
5304 config->radiusport[i] = config->radiusport[i-1];
5305 if (!config->radiusport[i])
5306 config->radiusport[i] = RADPORT;
5307 }
5308
5309 if (!config->numradiusservers)
5310 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5311
5312 // parse radius_authtypes_s
5313 config->radius_authtypes = config->radius_authprefer = 0;
5314 p = config->radius_authtypes_s;
5315 while (p && *p)
5316 {
5317 char *s = strpbrk(p, " \t,");
5318 int type = 0;
5319
5320 if (s)
5321 {
5322 *s++ = 0;
5323 while (*s == ' ' || *s == '\t')
5324 s++;
5325
5326 if (!*s)
5327 s = 0;
5328 }
5329
5330 if (!strncasecmp("chap", p, strlen(p)))
5331 type = AUTHCHAP;
5332 else if (!strncasecmp("pap", p, strlen(p)))
5333 type = AUTHPAP;
5334 else
5335 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5336
5337 config->radius_authtypes |= type;
5338 if (!config->radius_authprefer)
5339 config->radius_authprefer = type;
5340
5341 p = s;
5342 }
5343
5344 if (!config->radius_authtypes)
5345 {
5346 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5347 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5348 }
5349
5350 // normalise radius_authtypes_s
5351 if (config->radius_authprefer == AUTHPAP)
5352 {
5353 strcpy(config->radius_authtypes_s, "pap");
5354 if (config->radius_authtypes & AUTHCHAP)
5355 strcat(config->radius_authtypes_s, ", chap");
5356 }
5357 else
5358 {
5359 strcpy(config->radius_authtypes_s, "chap");
5360 if (config->radius_authtypes & AUTHPAP)
5361 strcat(config->radius_authtypes_s, ", pap");
5362 }
5363
5364 if (!config->radius_dae_port)
5365 config->radius_dae_port = DAEPORT;
5366
5367 #ifdef LAC
5368 if(!config->bind_portremotelns)
5369 config->bind_portremotelns = L2TPLACPORT;
5370 if(!config->bind_address_remotelns)
5371 config->bind_address_remotelns = INADDR_ANY;
5372 #endif
5373 if(!config->iftun_address)
5374 config->iftun_address = config->bind_address;
5375
5376 if (!*config->pppoe_ac_name)
5377 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5378
5379 // re-initialise the random number source
5380 initrandom(config->random_device);
5381
5382 // Update plugins
5383 for (i = 0; i < MAXPLUGINS; i++)
5384 {
5385 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5386 continue;
5387
5388 if (*config->plugins[i])
5389 {
5390 // Plugin added
5391 add_plugin(config->plugins[i]);
5392 }
5393 else if (*config->old_plugins[i])
5394 {
5395 // Plugin removed
5396 remove_plugin(config->old_plugins[i]);
5397 }
5398 }
5399
5400 // Guest change
5401 guest_accounts_num = 0;
5402 char *p2 = config->guest_user;
5403 while (p2 && *p2)
5404 {
5405 char *s = strpbrk(p2, " \t,");
5406 if (s)
5407 {
5408 *s++ = 0;
5409 while (*s == ' ' || *s == '\t')
5410 s++;
5411
5412 if (!*s)
5413 s = 0;
5414 }
5415
5416 strcpy(guest_users[guest_accounts_num], p2);
5417 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5418 guest_accounts_num++;
5419 p2 = s;
5420 }
5421 // Rebuild the guest_user array
5422 strcpy(config->guest_user, "");
5423 int ui = 0;
5424 for (ui=0; ui<guest_accounts_num; ui++)
5425 {
5426 strcat(config->guest_user, guest_users[ui]);
5427 if (ui<guest_accounts_num-1)
5428 {
5429 strcat(config->guest_user, ",");
5430 }
5431 }
5432
5433
5434 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5435 if (!config->multi_read_count) config->multi_read_count = 10;
5436 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5437 if (!*config->cluster_interface)
5438 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5439
5440 if (!config->cluster_hb_interval)
5441 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5442
5443 if (!config->cluster_hb_timeout)
5444 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5445
5446 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5447 {
5448 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5449 // late, ensure we're sufficiently larger than that
5450 int t = 4 * config->cluster_hb_interval + 11;
5451
5452 if (config->cluster_hb_timeout < t)
5453 {
5454 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5455 config->cluster_hb_timeout = t;
5456 }
5457
5458 // Push timing changes to the slaves immediately if we're the master
5459 if (config->cluster_iam_master)
5460 cluster_heartbeat();
5461
5462 interval = config->cluster_hb_interval;
5463 timeout = config->cluster_hb_timeout;
5464 }
5465
5466 // Write PID file
5467 if (*config->pid_file == '/' && !config->wrote_pid)
5468 {
5469 FILE *f;
5470 if ((f = fopen(config->pid_file, "w")))
5471 {
5472 fprintf(f, "%d\n", getpid());
5473 fclose(f);
5474 config->wrote_pid = 1;
5475 }
5476 else
5477 {
5478 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5479 }
5480 }
5481 }
5482
5483 static void read_config_file()
5484 {
5485 FILE *f;
5486
5487 if (!config->config_file) return;
5488 if (!(f = fopen(config->config_file, "r")))
5489 {
5490 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5491 return;
5492 }
5493
5494 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5495 cli_do_file(f);
5496 LOG(3, 0, 0, "Done reading config file\n");
5497 fclose(f);
5498 }
5499
5500 int sessionsetup(sessionidt s, tunnelidt t)
5501 {
5502 // A session now exists, set it up
5503 in_addr_t ip;
5504 char *user;
5505 sessionidt i;
5506 int r;
5507
5508 CSTAT(sessionsetup);
5509
5510 LOG(3, s, t, "Doing session setup for session\n");
5511
5512 // Join a bundle if the MRRU option is accepted
5513 if(session[s].mrru > 0 && session[s].bundle == 0)
5514 {
5515 LOG(3, s, t, "This session can be part of multilink bundle\n");
5516 if (join_bundle(s) > 0)
5517 cluster_send_bundle(session[s].bundle);
5518 else
5519 {
5520 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5521 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5522 return 0;
5523 }
5524 }
5525
5526 if (!session[s].ip)
5527 {
5528 assign_ip_address(s);
5529 if (!session[s].ip)
5530 {
5531 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5532 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5533 return 0;
5534 }
5535 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5536 fmtaddr(htonl(session[s].ip), 0));
5537 }
5538
5539 // Make sure this is right
5540 session[s].tunnel = t;
5541
5542 // zap old sessions with same IP and/or username
5543 // Don't kill gardened sessions - doing so leads to a DoS
5544 // from someone who doesn't need to know the password
5545 {
5546 ip = session[s].ip;
5547 user = session[s].user;
5548 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5549 {
5550 if (i == s) continue;
5551 if (!session[s].opened) break;
5552 // Allow duplicate sessions for multilink ones of the same bundle.
5553 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5554
5555 if (ip == session[i].ip)
5556 {
5557 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5558 continue;
5559 }
5560
5561 if (config->allow_duplicate_users) continue;
5562 if (session[s].walled_garden || session[i].walled_garden) continue;
5563 // Guest change
5564 int found = 0;
5565 int gu;
5566 for (gu = 0; gu < guest_accounts_num; gu++)
5567 {
5568 if (!strcasecmp(user, guest_users[gu]))
5569 {
5570 found = 1;
5571 break;
5572 }
5573 }
5574 if (found) continue;
5575
5576 // Drop the new session in case of duplicate sessionss, not the old one.
5577 if (!strcasecmp(user, session[i].user))
5578 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5579 }
5580 }
5581
5582 // no need to set a route for the same IP address of the bundle
5583 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5584 {
5585 int routed = 0;
5586
5587 // Add the route for this session.
5588 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5589 {
5590 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5591 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5592 routed++;
5593
5594 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5595 }
5596
5597 // Static IPs need to be routed if not already
5598 // convered by a Framed-Route. Anything else is part
5599 // of the IP address pool and is already routed, it
5600 // just needs to be added to the IP cache.
5601 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5602 if (session[s].ip_pool_index == -1) // static ip
5603 {
5604 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5605 }
5606 else
5607 cache_ipmap(session[s].ip, s);
5608 }
5609
5610 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5611 lcp_open(s, t); // transition to Network phase and send initial IPCP
5612
5613 // Run the plugin's against this new session.
5614 {
5615 struct param_new_session data = { &tunnel[t], &session[s] };
5616 run_plugins(PLUGIN_NEW_SESSION, &data);
5617 }
5618
5619 // Allocate TBFs if throttled
5620 if (session[s].throttle_in || session[s].throttle_out)
5621 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5622
5623 session[s].last_packet = session[s].last_data = time_now;
5624
5625 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5626 fmtaddr(htonl(session[s].ip), 0),
5627 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5628
5629 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5630
5631 return 1; // RADIUS OK and IP allocated, done...
5632 }
5633
5634 //
5635 // This session just got dropped on us by the master or something.
5636 // Make sure our tables up up to date...
5637 //
5638 int load_session(sessionidt s, sessiont *new)
5639 {
5640 int i;
5641 int newip = 0;
5642
5643 // Sanity checks.
5644 if (new->ip_pool_index >= MAXIPPOOL ||
5645 new->tunnel >= MAXTUNNEL)
5646 {
5647 LOG(0, s, 0, "Strange session update received!\n");
5648 // FIXME! What to do here?
5649 return 0;
5650 }
5651
5652 //
5653 // Ok. All sanity checks passed. Now we're committed to
5654 // loading the new session.
5655 //
5656
5657 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5658
5659 // See if routes/ip cache need updating
5660 if (new->ip != session[s].ip)
5661 newip++;
5662
5663 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5664 if (new->route[i].ip != session[s].route[i].ip ||
5665 new->route[i].prefixlen != session[s].route[i].prefixlen)
5666 newip++;
5667
5668 // needs update
5669 if (newip)
5670 {
5671 int routed = 0;
5672
5673 // remove old routes...
5674 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5675 {
5676 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5677 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5678 routed++;
5679
5680 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5681 }
5682
5683 // ...ip
5684 if (session[s].ip)
5685 {
5686 if (session[s].ip_pool_index == -1) // static IP
5687 {
5688 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5689 }
5690 else // It's part of the IP pool, remove it manually.
5691 uncache_ipmap(session[s].ip);
5692 }
5693
5694 routed = 0;
5695
5696 // add new routes...
5697 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5698 {
5699 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5700 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5701 routed++;
5702
5703 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5704 }
5705
5706 // ...ip
5707 if (new->ip)
5708 {
5709 // If there's a new one, add it.
5710 if (new->ip_pool_index == -1)
5711 {
5712 if (!routed) routeset(s, new->ip, 0, 0, 1);
5713 }
5714 else
5715 cache_ipmap(new->ip, s);
5716 }
5717 }
5718
5719 // check v6 routing
5720 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5721 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5722
5723 // check filters
5724 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5725 {
5726 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5727 new->filter_in = 0;
5728 }
5729
5730 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5731 {
5732 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5733 new->filter_out = 0;
5734 }
5735
5736 if (new->filter_in != session[s].filter_in)
5737 {
5738 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5739 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5740 }
5741
5742 if (new->filter_out != session[s].filter_out)
5743 {
5744 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5745 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5746 }
5747
5748 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5749 // for walking the sessions to forward byte counts to the master.
5750 config->cluster_highest_sessionid = s;
5751
5752 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5753
5754 // Do fixups into address pool.
5755 if (new->ip_pool_index != -1)
5756 fix_address_pool(s);
5757
5758 return 1;
5759 }
5760
5761 static void initplugins()
5762 {
5763 int i;
5764
5765 loaded_plugins = ll_init();
5766 // Initialize the plugins to nothing
5767 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5768 plugins[i] = ll_init();
5769 }
5770
5771 static void *open_plugin(char *plugin_name, int load)
5772 {
5773 char path[256] = "";
5774
5775 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5776 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5777 return dlopen(path, RTLD_NOW);
5778 }
5779
5780 // plugin callback to get a config value
5781 static void *getconfig(char *key, enum config_typet type)
5782 {
5783 int i;
5784
5785 for (i = 0; config_values[i].key; i++)
5786 {
5787 if (!strcmp(config_values[i].key, key))
5788 {
5789 if (config_values[i].type == type)
5790 return ((void *) config) + config_values[i].offset;
5791
5792 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5793 key, type, config_values[i].type);
5794
5795 return 0;
5796 }
5797 }
5798
5799 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5800 return 0;
5801 }
5802
5803 static int add_plugin(char *plugin_name)
5804 {
5805 static struct pluginfuncs funcs = {
5806 _log,
5807 _log_hex,
5808 fmtaddr,
5809 sessionbyuser,
5810 sessiontbysessionidt,
5811 sessionidtbysessiont,
5812 radiusnew,
5813 radiussend,
5814 getconfig,
5815 sessionshutdown,
5816 sessionkill,
5817 throttle_session,
5818 cluster_send_session,
5819 };
5820
5821 void *p = open_plugin(plugin_name, 1);
5822 int (*initfunc)(struct pluginfuncs *);
5823 int i;
5824
5825 if (!p)
5826 {
5827 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5828 return -1;
5829 }
5830
5831 if (ll_contains(loaded_plugins, p))
5832 {
5833 dlclose(p);
5834 return 0; // already loaded
5835 }
5836
5837 {
5838 int *v = dlsym(p, "plugin_api_version");
5839 if (!v || *v != PLUGIN_API_VERSION)
5840 {
5841 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5842 dlclose(p);
5843 return -1;
5844 }
5845 }
5846
5847 if ((initfunc = dlsym(p, "plugin_init")))
5848 {
5849 if (!initfunc(&funcs))
5850 {
5851 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5852 dlclose(p);
5853 return -1;
5854 }
5855 }
5856
5857 ll_push(loaded_plugins, p);
5858
5859 for (i = 0; i < max_plugin_functions; i++)
5860 {
5861 void *x;
5862 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5863 {
5864 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5865 ll_push(plugins[i], x);
5866 }
5867 }
5868
5869 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5870 return 1;
5871 }
5872
5873 static void run_plugin_done(void *plugin)
5874 {
5875 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5876
5877 if (donefunc)
5878 donefunc();
5879 }
5880
5881 static int remove_plugin(char *plugin_name)
5882 {
5883 void *p = open_plugin(plugin_name, 0);
5884 int loaded = 0;
5885
5886 if (!p)
5887 return -1;
5888
5889 if (ll_contains(loaded_plugins, p))
5890 {
5891 int i;
5892 for (i = 0; i < max_plugin_functions; i++)
5893 {
5894 void *x;
5895 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5896 ll_delete(plugins[i], x);
5897 }
5898
5899 ll_delete(loaded_plugins, p);
5900 run_plugin_done(p);
5901 loaded = 1;
5902 }
5903
5904 dlclose(p);
5905 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5906 return loaded;
5907 }
5908
5909 int run_plugins(int plugin_type, void *data)
5910 {
5911 int (*func)(void *data);
5912
5913 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5914 return PLUGIN_RET_ERROR;
5915
5916 ll_reset(plugins[plugin_type]);
5917 while ((func = ll_next(plugins[plugin_type])))
5918 {
5919 int r = func(data);
5920
5921 if (r != PLUGIN_RET_OK)
5922 return r; // stop here
5923 }
5924
5925 return PLUGIN_RET_OK;
5926 }
5927
5928 static void plugins_done()
5929 {
5930 void *p;
5931
5932 ll_reset(loaded_plugins);
5933 while ((p = ll_next(loaded_plugins)))
5934 run_plugin_done(p);
5935 }
5936
5937 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5938 {
5939 struct nsctl request;
5940 struct nsctl response;
5941 int type = unpack_control(&request, buf, len);
5942 int r;
5943 void *p;
5944
5945 if (log_stream && config->debug >= 4)
5946 {
5947 if (type < 0)
5948 {
5949 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5950 fmtaddr(addr->sin_addr.s_addr, 0), type);
5951 }
5952 else
5953 {
5954 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5955 dump_control(&request, log_stream);
5956 }
5957 }
5958
5959 switch (type)
5960 {
5961 case NSCTL_REQ_LOAD:
5962 if (request.argc != 1)
5963 {
5964 response.type = NSCTL_RES_ERR;
5965 response.argc = 1;
5966 response.argv[0] = "name of plugin required";
5967 }
5968 else if ((r = add_plugin(request.argv[0])) < 1)
5969 {
5970 response.type = NSCTL_RES_ERR;
5971 response.argc = 1;
5972 response.argv[0] = !r
5973 ? "plugin already loaded"
5974 : "error loading plugin";
5975 }
5976 else
5977 {
5978 response.type = NSCTL_RES_OK;
5979 response.argc = 0;
5980 }
5981
5982 break;
5983
5984 case NSCTL_REQ_UNLOAD:
5985 if (request.argc != 1)
5986 {
5987 response.type = NSCTL_RES_ERR;
5988 response.argc = 1;
5989 response.argv[0] = "name of plugin required";
5990 }
5991 else if ((r = remove_plugin(request.argv[0])) < 1)
5992 {
5993 response.type = NSCTL_RES_ERR;
5994 response.argc = 1;
5995 response.argv[0] = !r
5996 ? "plugin not loaded"
5997 : "plugin not found";
5998 }
5999 else
6000 {
6001 response.type = NSCTL_RES_OK;
6002 response.argc = 0;
6003 }
6004
6005 break;
6006
6007 case NSCTL_REQ_HELP:
6008 response.type = NSCTL_RES_OK;
6009 response.argc = 0;
6010
6011 ll_reset(loaded_plugins);
6012 while ((p = ll_next(loaded_plugins)))
6013 {
6014 char **help = dlsym(p, "plugin_control_help");
6015 while (response.argc < 0xff && help && *help)
6016 response.argv[response.argc++] = *help++;
6017 }
6018
6019 break;
6020
6021 case NSCTL_REQ_CONTROL:
6022 {
6023 struct param_control param = {
6024 config->cluster_iam_master,
6025 request.argc,
6026 request.argv,
6027 0,
6028 NULL,
6029 };
6030
6031 int r = run_plugins(PLUGIN_CONTROL, &param);
6032
6033 if (r == PLUGIN_RET_ERROR)
6034 {
6035 response.type = NSCTL_RES_ERR;
6036 response.argc = 1;
6037 response.argv[0] = param.additional
6038 ? param.additional
6039 : "error returned by plugin";
6040 }
6041 else if (r == PLUGIN_RET_NOTMASTER)
6042 {
6043 static char msg[] = "must be run on master: 000.000.000.000";
6044
6045 response.type = NSCTL_RES_ERR;
6046 response.argc = 1;
6047 if (config->cluster_master_address)
6048 {
6049 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6050 response.argv[0] = msg;
6051 }
6052 else
6053 {
6054 response.argv[0] = "must be run on master: none elected";
6055 }
6056 }
6057 else if (!(param.response & NSCTL_RESPONSE))
6058 {
6059 response.type = NSCTL_RES_ERR;
6060 response.argc = 1;
6061 response.argv[0] = param.response
6062 ? "unrecognised response value from plugin"
6063 : "unhandled action";
6064 }
6065 else
6066 {
6067 response.type = param.response;
6068 response.argc = 0;
6069 if (param.additional)
6070 {
6071 response.argc = 1;
6072 response.argv[0] = param.additional;
6073 }
6074 }
6075 }
6076
6077 break;
6078
6079 default:
6080 response.type = NSCTL_RES_ERR;
6081 response.argc = 1;
6082 response.argv[0] = "error unpacking control packet";
6083 }
6084
6085 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6086 if (!buf)
6087 {
6088 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6089 return;
6090 }
6091
6092 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6093 if (r > 0)
6094 {
6095 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6096 if (log_stream && config->debug >= 4)
6097 {
6098 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6099 dump_control(&response, log_stream);
6100 }
6101 }
6102 else
6103 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6104 fmtaddr(addr->sin_addr.s_addr, 0), r);
6105
6106 free(buf);
6107 }
6108
6109 static tunnelidt new_tunnel()
6110 {
6111 tunnelidt i;
6112 for (i = 1; i < MAXTUNNEL; i++)
6113 {
6114 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6115 {
6116 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6117 if (i > config->cluster_highest_tunnelid)
6118 config->cluster_highest_tunnelid = i;
6119 return i;
6120 }
6121 }
6122 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6123 return 0;
6124 }
6125
6126 //
6127 // We're becoming the master. Do any required setup..
6128 //
6129 // This is principally telling all the plugins that we're
6130 // now a master, and telling them about all the sessions
6131 // that are active too..
6132 //
6133 void become_master(void)
6134 {
6135 int s, i;
6136 static struct event_data d[RADIUS_FDS];
6137 struct epoll_event e;
6138
6139 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6140
6141 // running a bunch of iptables commands is slow and can cause
6142 // the master to drop tunnels on takeover--kludge around the
6143 // problem by forking for the moment (note: race)
6144 if (!fork_and_close())
6145 {
6146 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6147 {
6148 if (!session[s].opened) // Not an in-use session.
6149 continue;
6150
6151 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6152 }
6153 exit(0);
6154 }
6155
6156 // add radius fds
6157 e.events = EPOLLIN;
6158 for (i = 0; i < RADIUS_FDS; i++)
6159 {
6160 d[i].type = FD_TYPE_RADIUS;
6161 d[i].index = i;
6162 e.data.ptr = &d[i];
6163
6164 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6165 }
6166 }
6167
6168 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6169 {
6170 int s, i;
6171 int count = 0;
6172 int buckets[64];
6173
6174 if (CLI_HELP_REQUESTED)
6175 return CLI_HELP_NO_ARGS;
6176
6177 time(&time_now);
6178 for (i = 0; i < 64;++i) buckets[i] = 0;
6179
6180 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6181 {
6182 int idle;
6183 if (!session[s].opened)
6184 continue;
6185
6186 idle = time_now - session[s].last_data;
6187 idle /= 5 ; // In multiples of 5 seconds.
6188 if (idle < 0)
6189 idle = 0;
6190 if (idle > 63)
6191 idle = 63;
6192
6193 ++count;
6194 ++buckets[idle];
6195 }
6196
6197 for (i = 0; i < 63; ++i)
6198 {
6199 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6200 }
6201 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6202 cli_print(cli, "%d total sessions open.", count);
6203 return CLI_OK;
6204 }
6205
6206 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6207 {
6208 int s, i;
6209 int count = 0;
6210 int buckets[64];
6211
6212 if (CLI_HELP_REQUESTED)
6213 return CLI_HELP_NO_ARGS;
6214
6215 time(&time_now);
6216 for (i = 0; i < 64;++i) buckets[i] = 0;
6217
6218 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6219 {
6220 int open = 0, d;
6221 if (!session[s].opened)
6222 continue;
6223
6224 d = time_now - session[s].opened;
6225 if (d < 0)
6226 d = 0;
6227 while (d > 1 && open < 32)
6228 {
6229 ++open;
6230 d >>= 1; // half.
6231 }
6232 ++count;
6233 ++buckets[open];
6234 }
6235
6236 s = 1;
6237 for (i = 0; i < 30; ++i)
6238 {
6239 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6240 s <<= 1;
6241 }
6242 cli_print(cli, "%d total sessions open.", count);
6243 return CLI_OK;
6244 }
6245
6246 /* Unhide an avp.
6247 *
6248 * This unencodes the AVP using the L2TP secret and the previously
6249 * stored random vector. It overwrites the hidden data with the
6250 * unhidden AVP subformat.
6251 */
6252 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6253 {
6254 MD5_CTX ctx;
6255 uint8_t digest[16];
6256 uint8_t *last;
6257 size_t d = 0;
6258 uint16_t m = htons(type);
6259
6260 // Compute initial pad
6261 MD5_Init(&ctx);
6262 MD5_Update(&ctx, (unsigned char *) &m, 2);
6263 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6264 MD5_Update(&ctx, vector, vec_len);
6265 MD5_Final(digest, &ctx);
6266
6267 // pointer to last decoded 16 octets
6268 last = value;
6269
6270 while (len > 0)
6271 {
6272 // calculate a new pad based on the last decoded block
6273 if (d >= sizeof(digest))
6274 {
6275 MD5_Init(&ctx);
6276 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6277 MD5_Update(&ctx, last, sizeof(digest));
6278 MD5_Final(digest, &ctx);
6279
6280 d = 0;
6281 last = value;
6282 }
6283
6284 *value++ ^= digest[d++];
6285 len--;
6286 }
6287 }
6288
6289 int find_filter(char const *name, size_t len)
6290 {
6291 int free = -1;
6292 int i;
6293
6294 for (i = 0; i < MAXFILTER; i++)
6295 {
6296 if (!*ip_filters[i].name)
6297 {
6298 if (free < 0)
6299 free = i;
6300
6301 continue;
6302 }
6303
6304 if (strlen(ip_filters[i].name) != len)
6305 continue;
6306
6307 if (!strncmp(ip_filters[i].name, name, len))
6308 return i;
6309 }
6310
6311 return free;
6312 }
6313
6314 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6315 {
6316 switch (p->op)
6317 {
6318 case FILTER_PORT_OP_EQ: return port == p->port;
6319 case FILTER_PORT_OP_NEQ: return port != p->port;
6320 case FILTER_PORT_OP_GT: return port > p->port;
6321 case FILTER_PORT_OP_LT: return port < p->port;
6322 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6323 }
6324
6325 return 0;
6326 }
6327
6328 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6329 {
6330 switch (op)
6331 {
6332 case FILTER_FLAG_OP_ANY:
6333 return (flags & sflags) || (~flags & cflags);
6334
6335 case FILTER_FLAG_OP_ALL:
6336 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6337
6338 case FILTER_FLAG_OP_EST:
6339 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6340 }
6341
6342 return 0;
6343 }
6344
6345 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6346 {
6347 uint16_t frag_offset;
6348 uint8_t proto;
6349 in_addr_t src_ip;
6350 in_addr_t dst_ip;
6351 uint16_t src_port = 0;
6352 uint16_t dst_port = 0;
6353 uint8_t flags = 0;
6354 ip_filter_rulet *rule;
6355
6356 if (len < 20) // up to end of destination address
6357 return 0;
6358
6359 if ((*buf >> 4) != 4) // IPv4
6360 return 0;
6361
6362 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6363 proto = buf[9];
6364 src_ip = *(in_addr_t *) (buf + 12);
6365 dst_ip = *(in_addr_t *) (buf + 16);
6366
6367 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6368 {
6369 int l = (buf[0] & 0xf) * 4; // length of IP header
6370 if (len < l + 4) // ports
6371 return 0;
6372
6373 src_port = ntohs(*(uint16_t *) (buf + l));
6374 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6375 if (proto == IPPROTO_TCP)
6376 {
6377 if (len < l + 14) // flags
6378 return 0;
6379
6380 flags = buf[l + 13] & 0x3f;
6381 }
6382 }
6383
6384 for (rule = ip_filters[filter].rules; rule->action; rule++)
6385 {
6386 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6387 continue;
6388
6389 if (rule->src_wild != INADDR_BROADCAST &&
6390 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6391 continue;
6392
6393 if (rule->dst_wild != INADDR_BROADCAST &&
6394 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6395 continue;
6396
6397 if (frag_offset)
6398 {
6399 // layer 4 deny rules are skipped
6400 if (rule->action == FILTER_ACTION_DENY &&
6401 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6402 continue;
6403 }
6404 else
6405 {
6406 if (rule->frag)
6407 continue;
6408
6409 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6410 {
6411 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6412 continue;
6413
6414 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6415 continue;
6416
6417 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6418 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6419 continue;
6420 }
6421 }
6422
6423 // matched
6424 rule->counter++;
6425 return rule->action == FILTER_ACTION_PERMIT;
6426 }
6427
6428 // default deny
6429 return 0;
6430 }
6431
6432 #ifdef LAC
6433
6434 tunnelidt lac_new_tunnel()
6435 {
6436 return new_tunnel();
6437 }
6438
6439 void lac_tunnelclear(tunnelidt t)
6440 {
6441 tunnelclear(t);
6442 }
6443
6444 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6445 {
6446 uint16_t version = 0x0100; // protocol version
6447
6448 tunnel[t].state = TUNNELOPENING;
6449
6450 // Sent SCCRQ - Start Control Connection Request
6451 controlt *c = controlnew(1); // sending SCCRQ
6452 controls(c, 7, hostname, 1); // host name
6453 controls(c, 8, Vendor_name, 1); // Vendor name
6454 control16(c, 2, version, 1); // protocol version
6455 control32(c, 3, 3, 1); // framing Capabilities
6456 control16(c, 9, t, 1); // assigned tunnel
6457 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6458 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6459 controladd(c, 0, t); // send
6460 }
6461
6462 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6463 {
6464 // Sent ICRQ Incoming-call-request
6465 controlt *c = controlnew(10); // ICRQ
6466
6467 control16(c, 14, s, 1); // assigned sesion
6468 call_serial_number++;
6469 control32(c, 15, call_serial_number, 1); // call serial number
6470 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6471 controladd(c, 0, t); // send
6472 }
6473
6474 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6475 {
6476 tunnelshutdown(t, reason, result, error, msg);
6477 }
6478
6479 #endif