71d5857daadc59a41416b87f3cb174fd1046fccf
[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_name", pppoe_if_name, STRING),
191 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
192 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
193 { NULL, 0, 0, 0 },
194 };
195
196 static char *plugin_functions[] = {
197 NULL,
198 "plugin_pre_auth",
199 "plugin_post_auth",
200 "plugin_timer",
201 "plugin_new_session",
202 "plugin_kill_session",
203 "plugin_control",
204 "plugin_radius_response",
205 "plugin_radius_reset",
206 "plugin_radius_account",
207 "plugin_become_master",
208 "plugin_new_session_master",
209 };
210
211 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
212
213 // Counters for shutdown sessions
214 static sessiont shut_acct[8192];
215 static sessionidt shut_acct_n = 0;
216
217 tunnelt *tunnel = NULL; // Array of tunnel structures.
218 bundlet *bundle = NULL; // Array of bundle structures.
219 fragmentationt *frag = NULL; // Array of fragmentation structures.
220 sessiont *session = NULL; // Array of session structures.
221 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
222 radiust *radius = NULL; // Array of radius structures.
223 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
224 ip_filtert *ip_filters = NULL; // Array of named filters.
225 static controlt *controlfree = 0;
226 struct Tstats *_statistics = NULL;
227 #ifdef RINGBUFFER
228 struct Tringbuffer *ringbuffer = NULL;
229 #endif
230
231 static ssize_t netlink_send(struct nlmsghdr *nh);
232 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
233 static void cache_ipmap(in_addr_t ip, sessionidt s);
234 static void uncache_ipmap(in_addr_t ip);
235 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
236 static void free_ip_address(sessionidt s);
237 static void dump_acct_info(int all);
238 static void sighup_handler(int sig);
239 static void shutdown_handler(int sig);
240 static void sigchild_handler(int sig);
241 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
242 static void update_config(void);
243 static void read_config_file(void);
244 static void initplugins(void);
245 static int add_plugin(char *plugin_name);
246 static int remove_plugin(char *plugin_name);
247 static void plugins_done(void);
248 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
249 static tunnelidt new_tunnel(void);
250 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
251 static void bundleclear(bundleidt b);
252
253 // return internal time (10ths since process startup), set f if given
254 // as a side-effect sets time_now, and time_changed
255 static clockt now(double *f)
256 {
257 struct timeval t;
258 gettimeofday(&t, 0);
259 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
260 if (t.tv_sec != time_now)
261 {
262 time_now = t.tv_sec;
263 time_changed++;
264 }
265
266 // Time in milliseconds
267 // TODO FOR MLPPP DEV
268 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
269
270 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
271 }
272
273 // work out a retry time based on try number
274 // This is a straight bounded exponential backoff.
275 // Maximum re-try time is 32 seconds. (2^5).
276 clockt backoff(uint8_t try)
277 {
278 if (try > 5) try = 5; // max backoff
279 return now(NULL) + 10 * (1 << try);
280 }
281
282
283 //
284 // Log a debug message. Typically called via the LOG macro
285 //
286 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
287 {
288 static char message[65536] = {0};
289 va_list ap;
290
291 #ifdef RINGBUFFER
292 if (ringbuffer)
293 {
294 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
295 ringbuffer->tail = 0;
296 if (ringbuffer->tail == ringbuffer->head)
297 if (++ringbuffer->head >= RINGBUFFER_SIZE)
298 ringbuffer->head = 0;
299
300 ringbuffer->buffer[ringbuffer->tail].level = level;
301 ringbuffer->buffer[ringbuffer->tail].session = s;
302 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
303 va_start(ap, format);
304 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
305 va_end(ap);
306 }
307 #endif
308
309 if (config->debug < level) return;
310
311 va_start(ap, format);
312 vsnprintf(message, sizeof(message), format, ap);
313
314 if (log_stream)
315 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
316 else if (syslog_log)
317 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
318
319 va_end(ap);
320 }
321
322 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
323 {
324 int i, j;
325 const uint8_t *d = data;
326
327 if (config->debug < level) return;
328
329 // No support for _log_hex to syslog
330 if (log_stream)
331 {
332 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
333 setvbuf(log_stream, NULL, _IOFBF, 16384);
334
335 for (i = 0; i < maxsize; )
336 {
337 fprintf(log_stream, "%4X: ", i);
338 for (j = i; j < maxsize && j < (i + 16); j++)
339 {
340 fprintf(log_stream, "%02X ", d[j]);
341 if (j == i + 7)
342 fputs(": ", log_stream);
343 }
344
345 for (; j < i + 16; j++)
346 {
347 fputs(" ", log_stream);
348 if (j == i + 7)
349 fputs(": ", log_stream);
350 }
351
352 fputs(" ", log_stream);
353 for (j = i; j < maxsize && j < (i + 16); j++)
354 {
355 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
356 fputc(d[j], log_stream);
357 else
358 fputc('.', log_stream);
359
360 if (j == i + 7)
361 fputs(" ", log_stream);
362 }
363
364 i = j;
365 fputs("\n", log_stream);
366 }
367
368 fflush(log_stream);
369 setbuf(log_stream, NULL);
370 }
371 }
372
373 // update a counter, accumulating 2^32 wraps
374 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
375 {
376 uint32_t new = *counter + delta;
377 if (new < *counter)
378 (*wrap)++;
379
380 *counter = new;
381 }
382
383 // initialise the random generator
384 static void initrandom(char *source)
385 {
386 static char path[sizeof(config->random_device)] = "*undefined*";
387
388 // reinitialise only if we are forced to do so or if the config has changed
389 if (source && !strncmp(path, source, sizeof(path)))
390 return;
391
392 // close previous source, if any
393 if (rand_fd >= 0)
394 close(rand_fd);
395
396 rand_fd = -1;
397
398 if (source)
399 {
400 // register changes
401 snprintf(path, sizeof(path), "%s", source);
402
403 if (*path == '/')
404 {
405 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
406 if (rand_fd < 0)
407 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
408 path, strerror(errno));
409 }
410 }
411 }
412
413 // fill buffer with random data
414 void random_data(uint8_t *buf, int len)
415 {
416 int n = 0;
417
418 CSTAT(random_data);
419 if (rand_fd >= 0)
420 {
421 n = read(rand_fd, buf, len);
422 if (n >= len) return;
423 if (n < 0)
424 {
425 if (errno != EAGAIN)
426 {
427 LOG(0, 0, 0, "Error reading from random source: %s\n",
428 strerror(errno));
429
430 // fall back to rand()
431 initrandom(NULL);
432 }
433
434 n = 0;
435 }
436 }
437
438 // append missing data
439 while (n < len)
440 // not using the low order bits from the prng stream
441 buf[n++] = (rand() >> 4) & 0xff;
442 }
443
444 // Add a route
445 //
446 // This adds it to the routing table, advertises it
447 // via BGP if enabled, and stuffs it into the
448 // 'sessionbyip' cache.
449 //
450 // 'ip' must be in _host_ order.
451 //
452 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
453 {
454 struct {
455 struct nlmsghdr nh;
456 struct rtmsg rt;
457 char buf[32];
458 } req;
459 int i;
460 in_addr_t n_ip;
461
462 if (!prefixlen) prefixlen = 32;
463
464 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
465
466 memset(&req, 0, sizeof(req));
467
468 if (add)
469 {
470 req.nh.nlmsg_type = RTM_NEWROUTE;
471 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
472 }
473 else
474 {
475 req.nh.nlmsg_type = RTM_DELROUTE;
476 req.nh.nlmsg_flags = NLM_F_REQUEST;
477 }
478
479 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
480
481 req.rt.rtm_family = AF_INET;
482 req.rt.rtm_dst_len = prefixlen;
483 req.rt.rtm_table = RT_TABLE_MAIN;
484 req.rt.rtm_protocol = 42;
485 req.rt.rtm_scope = RT_SCOPE_LINK;
486 req.rt.rtm_type = RTN_UNICAST;
487
488 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
489 n_ip = htonl(ip);
490 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
491 if (gw)
492 {
493 n_ip = htonl(gw);
494 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
495 }
496
497 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
498 fmtaddr(htonl(ip), 0), prefixlen,
499 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
500
501 if (netlink_send(&req.nh) < 0)
502 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
503
504 #ifdef BGP
505 if (add)
506 bgp_add_route(htonl(ip), prefixlen);
507 else
508 bgp_del_route(htonl(ip), prefixlen);
509 #endif /* BGP */
510
511 // Add/Remove the IPs to the 'sessionbyip' cache.
512 // Note that we add the zero address in the case of
513 // a network route. Roll on CIDR.
514
515 // Note that 's == 0' implies this is the address pool.
516 // We still cache it here, because it will pre-fill
517 // the malloc'ed tree.
518
519 if (s)
520 {
521 if (!add) // Are we deleting a route?
522 s = 0; // Caching the session as '0' is the same as uncaching.
523
524 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
525 cache_ipmap(i, s);
526 }
527 }
528
529 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
530 {
531 struct {
532 struct nlmsghdr nh;
533 struct rtmsg rt;
534 char buf[64];
535 } req;
536 int metric;
537 char ipv6addr[INET6_ADDRSTRLEN];
538
539 if (!config->ipv6_prefix.s6_addr[0])
540 {
541 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
542 return;
543 }
544
545 memset(&req, 0, sizeof(req));
546
547 if (add)
548 {
549 req.nh.nlmsg_type = RTM_NEWROUTE;
550 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
551 }
552 else
553 {
554 req.nh.nlmsg_type = RTM_DELROUTE;
555 req.nh.nlmsg_flags = NLM_F_REQUEST;
556 }
557
558 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
559
560 req.rt.rtm_family = AF_INET6;
561 req.rt.rtm_dst_len = prefixlen;
562 req.rt.rtm_table = RT_TABLE_MAIN;
563 req.rt.rtm_protocol = 42;
564 req.rt.rtm_scope = RT_SCOPE_LINK;
565 req.rt.rtm_type = RTN_UNICAST;
566
567 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
568 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
569 metric = 1;
570 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
571
572 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
573 add ? "add" : "del",
574 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
575 prefixlen);
576
577 if (netlink_send(&req.nh) < 0)
578 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
579
580 #ifdef BGP
581 if (add)
582 bgp_add_route6(ip, prefixlen);
583 else
584 bgp_del_route6(ip, prefixlen);
585 #endif /* BGP */
586
587 if (s)
588 {
589 if (!add) // Are we deleting a route?
590 s = 0; // Caching the session as '0' is the same as uncaching.
591
592 cache_ipv6map(ip, prefixlen, s);
593 }
594
595 return;
596 }
597
598 //
599 // Set up netlink socket
600 static void initnetlink(void)
601 {
602 struct sockaddr_nl nladdr;
603
604 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
605 if (nlfd < 0)
606 {
607 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
608 exit(1);
609 }
610
611 memset(&nladdr, 0, sizeof(nladdr));
612 nladdr.nl_family = AF_NETLINK;
613 nladdr.nl_pid = getpid();
614
615 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
616 {
617 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
618 exit(1);
619 }
620 }
621
622 static ssize_t netlink_send(struct nlmsghdr *nh)
623 {
624 struct sockaddr_nl nladdr;
625 struct iovec iov;
626 struct msghdr msg;
627
628 nh->nlmsg_pid = getpid();
629 nh->nlmsg_seq = ++nlseqnum;
630
631 // set kernel address
632 memset(&nladdr, 0, sizeof(nladdr));
633 nladdr.nl_family = AF_NETLINK;
634
635 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
636 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
637
638 return sendmsg(nlfd, &msg, 0);
639 }
640
641 static ssize_t netlink_recv(void *buf, ssize_t len)
642 {
643 struct sockaddr_nl nladdr;
644 struct iovec iov;
645 struct msghdr msg;
646
647 // set kernel address
648 memset(&nladdr, 0, sizeof(nladdr));
649 nladdr.nl_family = AF_NETLINK;
650
651 iov = (struct iovec){ buf, len };
652 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
653
654 return recvmsg(nlfd, &msg, 0);
655 }
656
657 /* adapted from iproute2 */
658 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
659 {
660 int len = RTA_LENGTH(alen);
661 struct rtattr *rta;
662
663 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
664 rta->rta_type = type;
665 rta->rta_len = len;
666 memcpy(RTA_DATA(rta), data, alen);
667 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
668 }
669
670 // messages corresponding to different phases seq number
671 static char *tun_nl_phase_msg[] = {
672 "initialized",
673 "getting tun interface index",
674 "setting tun interface parameters",
675 "setting tun IPv4 address",
676 "setting tun LL IPv6 address",
677 "setting tun global IPv6 address",
678 };
679
680 //
681 // Set up TUN interface
682 static void inittun(void)
683 {
684 struct ifreq ifr;
685
686 memset(&ifr, 0, sizeof(ifr));
687 ifr.ifr_flags = IFF_TUN;
688
689 tunfd = open(TUNDEVICE, O_RDWR);
690 if (tunfd < 0)
691 { // fatal
692 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
693 exit(1);
694 }
695 {
696 int flags = fcntl(tunfd, F_GETFL, 0);
697 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
698 }
699
700 if (*config->tundevicename)
701 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
702
703 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
704 {
705 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
706 exit(1);
707 }
708 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
709 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
710
711 tunidx = if_nametoindex(config->tundevicename);
712 if (tunidx == 0)
713 {
714 LOG(0, 0, 0, "Can't get tun interface index\n");
715 exit(1);
716 }
717
718 {
719 struct {
720 // interface setting
721 struct nlmsghdr nh;
722 union {
723 struct ifinfomsg ifinfo;
724 struct ifaddrmsg ifaddr;
725 } ifmsg;
726 char rtdata[32]; // 32 should be enough
727 } req;
728 uint32_t txqlen, mtu;
729 in_addr_t ip;
730
731 memset(&req, 0, sizeof(req));
732
733 req.nh.nlmsg_type = RTM_NEWLINK;
734 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
735 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
736
737 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
738 req.ifmsg.ifinfo.ifi_index = tunidx;
739 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
740 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
741
742 /* Bump up the qlen to deal with bursts from the network */
743 txqlen = 1000;
744 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
745 /* set MTU to modem MRU */
746 mtu = MRU;
747 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
748
749 if (netlink_send(&req.nh) < 0)
750 goto senderror;
751
752 memset(&req, 0, sizeof(req));
753
754 req.nh.nlmsg_type = RTM_NEWADDR;
755 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
756 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
757
758 req.ifmsg.ifaddr.ifa_family = AF_INET;
759 req.ifmsg.ifaddr.ifa_prefixlen = 32;
760 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
761 req.ifmsg.ifaddr.ifa_index = tunidx;
762
763 if (config->iftun_address)
764 ip = config->iftun_address;
765 else
766 ip = 0x01010101; // 1.1.1.1
767 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
768
769 if (netlink_send(&req.nh) < 0)
770 goto senderror;
771
772 // Only setup IPv6 on the tun device if we have a configured prefix
773 if (config->ipv6_prefix.s6_addr[0]) {
774 struct in6_addr ip6;
775
776 memset(&req, 0, sizeof(req));
777
778 req.nh.nlmsg_type = RTM_NEWADDR;
779 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
780 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
781
782 req.ifmsg.ifaddr.ifa_family = AF_INET6;
783 req.ifmsg.ifaddr.ifa_prefixlen = 64;
784 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
785 req.ifmsg.ifaddr.ifa_index = tunidx;
786
787 // Link local address is FE80::1
788 memset(&ip6, 0, sizeof(ip6));
789 ip6.s6_addr[0] = 0xFE;
790 ip6.s6_addr[1] = 0x80;
791 ip6.s6_addr[15] = 1;
792 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
793
794 if (netlink_send(&req.nh) < 0)
795 goto senderror;
796
797 memset(&req, 0, sizeof(req));
798
799 req.nh.nlmsg_type = RTM_NEWADDR;
800 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
801 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
802
803 req.ifmsg.ifaddr.ifa_family = AF_INET6;
804 req.ifmsg.ifaddr.ifa_prefixlen = 64;
805 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
806 req.ifmsg.ifaddr.ifa_index = tunidx;
807
808 // Global address is prefix::1
809 ip6 = config->ipv6_prefix;
810 ip6.s6_addr[15] = 1;
811 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
812
813 if (netlink_send(&req.nh) < 0)
814 goto senderror;
815 }
816
817 memset(&req, 0, sizeof(req));
818
819 req.nh.nlmsg_type = NLMSG_DONE;
820 req.nh.nlmsg_len = NLMSG_LENGTH(0);
821
822 if (netlink_send(&req.nh) < 0)
823 goto senderror;
824
825 // if we get an error for seqnum < min_initok_nlseqnum,
826 // we must exit as initialization went wrong
827 if (config->ipv6_prefix.s6_addr[0])
828 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
829 else
830 min_initok_nlseqnum = 3 + 1; // idx + if + addr
831 }
832
833 return;
834
835 senderror:
836 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
837 exit(1);
838 }
839
840 // set up UDP ports
841 static void initudp(void)
842 {
843 int on = 1;
844 struct sockaddr_in addr;
845
846 // Tunnel
847 memset(&addr, 0, sizeof(addr));
848 addr.sin_family = AF_INET;
849 addr.sin_port = htons(L2TPPORT);
850 addr.sin_addr.s_addr = config->bind_address;
851 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
852 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
853 {
854 int flags = fcntl(udpfd, F_GETFL, 0);
855 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
856 }
857 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
858 {
859 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
860 exit(1);
861 }
862
863 // Control
864 memset(&addr, 0, sizeof(addr));
865 addr.sin_family = AF_INET;
866 addr.sin_port = htons(NSCTL_PORT);
867 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
868 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
869 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
870 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
871 {
872 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
873 exit(1);
874 }
875
876 // Dynamic Authorization Extensions to RADIUS
877 memset(&addr, 0, sizeof(addr));
878 addr.sin_family = AF_INET;
879 addr.sin_port = htons(config->radius_dae_port);
880 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
881 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
882 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
883 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
884 {
885 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
886 exit(1);
887 }
888
889 #ifdef LAC
890 // Tunnel to Remote LNS
891 memset(&addr, 0, sizeof(addr));
892 addr.sin_family = AF_INET;
893 addr.sin_port = htons(config->bind_portremotelns);
894 addr.sin_addr.s_addr = config->bind_address_remotelns;
895 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
896 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
897 {
898 int flags = fcntl(udplacfd, F_GETFL, 0);
899 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
900 }
901 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
902 {
903 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
904 exit(1);
905 }
906 #endif
907
908 // Intercept
909 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
910 }
911
912 //
913 // Find session by IP, < 1 for not found
914 //
915 // Confusingly enough, this 'ip' must be
916 // in _network_ order. This being the common
917 // case when looking it up from IP packet headers.
918 //
919 // We actually use this cache for two things.
920 // #1. For used IP addresses, this maps to the
921 // session ID that it's used by.
922 // #2. For un-used IP addresses, this maps to the
923 // index into the pool table that contains that
924 // IP address.
925 //
926
927 static sessionidt lookup_ipmap(in_addr_t ip)
928 {
929 uint8_t *a = (uint8_t *) &ip;
930 union iphash *h = ip_hash;
931
932 if (!(h = h[*a++].idx)) return 0;
933 if (!(h = h[*a++].idx)) return 0;
934 if (!(h = h[*a++].idx)) return 0;
935
936 return h[*a].sess;
937 }
938
939 static sessionidt lookup_ipv6map(struct in6_addr ip)
940 {
941 struct ipv6radix *curnode;
942 int i;
943 int s;
944 char ipv6addr[INET6_ADDRSTRLEN];
945
946 curnode = &ipv6_hash[ip.s6_addr[0]];
947 i = 1;
948 s = curnode->sess;
949
950 while (s == 0 && i < 15 && curnode->branch != NULL)
951 {
952 curnode = &curnode->branch[ip.s6_addr[i]];
953 s = curnode->sess;
954 i++;
955 }
956
957 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
958 inet_ntop(AF_INET6, &ip, ipv6addr,
959 INET6_ADDRSTRLEN),
960 s);
961
962 return s;
963 }
964
965 sessionidt sessionbyip(in_addr_t ip)
966 {
967 sessionidt s = lookup_ipmap(ip);
968 CSTAT(sessionbyip);
969
970 if (s > 0 && s < MAXSESSION && session[s].opened)
971 return s;
972
973 return 0;
974 }
975
976 sessionidt sessionbyipv6(struct in6_addr ip)
977 {
978 sessionidt s;
979 CSTAT(sessionbyipv6);
980
981 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
982 (ip.s6_addr[0] == 0xFE &&
983 ip.s6_addr[1] == 0x80 &&
984 ip.s6_addr16[1] == 0 &&
985 ip.s6_addr16[2] == 0 &&
986 ip.s6_addr16[3] == 0)) {
987 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
988 } else {
989 s = lookup_ipv6map(ip);
990 }
991
992 if (s > 0 && s < MAXSESSION && session[s].opened)
993 return s;
994
995 return 0;
996 }
997
998 //
999 // Take an IP address in HOST byte order and
1000 // add it to the sessionid by IP cache.
1001 //
1002 // (It's actually cached in network order)
1003 //
1004 static void cache_ipmap(in_addr_t ip, sessionidt s)
1005 {
1006 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1007 uint8_t *a = (uint8_t *) &nip;
1008 union iphash *h = ip_hash;
1009 int i;
1010
1011 for (i = 0; i < 3; i++)
1012 {
1013 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1014 return;
1015
1016 h = h[a[i]].idx;
1017 }
1018
1019 h[a[3]].sess = s;
1020
1021 if (s > 0)
1022 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1023
1024 else if (s == 0)
1025 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1026 // else a map to an ip pool index.
1027 }
1028
1029 static void uncache_ipmap(in_addr_t ip)
1030 {
1031 cache_ipmap(ip, 0); // Assign it to the NULL session.
1032 }
1033
1034 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1035 {
1036 int i;
1037 int bytes;
1038 struct ipv6radix *curnode;
1039 char ipv6addr[INET6_ADDRSTRLEN];
1040
1041 curnode = &ipv6_hash[ip.s6_addr[0]];
1042
1043 bytes = prefixlen >> 3;
1044 i = 1;
1045 while (i < bytes) {
1046 if (curnode->branch == NULL)
1047 {
1048 if (!(curnode->branch = calloc(256,
1049 sizeof (struct ipv6radix))))
1050 return;
1051 }
1052 curnode = &curnode->branch[ip.s6_addr[i]];
1053 i++;
1054 }
1055
1056 curnode->sess = s;
1057
1058 if (s > 0)
1059 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1060 inet_ntop(AF_INET6, &ip, ipv6addr,
1061 INET6_ADDRSTRLEN),
1062 prefixlen);
1063 else if (s == 0)
1064 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1065 inet_ntop(AF_INET6, &ip, ipv6addr,
1066 INET6_ADDRSTRLEN),
1067 prefixlen);
1068 }
1069
1070 //
1071 // CLI list to dump current ipcache.
1072 //
1073 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1074 {
1075 union iphash *d = ip_hash, *e, *f, *g;
1076 int i, j, k, l;
1077 int count = 0;
1078
1079 if (CLI_HELP_REQUESTED)
1080 return CLI_HELP_NO_ARGS;
1081
1082 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1083
1084 for (i = 0; i < 256; ++i)
1085 {
1086 if (!d[i].idx)
1087 continue;
1088
1089 e = d[i].idx;
1090 for (j = 0; j < 256; ++j)
1091 {
1092 if (!e[j].idx)
1093 continue;
1094
1095 f = e[j].idx;
1096 for (k = 0; k < 256; ++k)
1097 {
1098 if (!f[k].idx)
1099 continue;
1100
1101 g = f[k].idx;
1102 for (l = 0; l < 256; ++l)
1103 {
1104 if (!g[l].sess)
1105 continue;
1106
1107 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1108 ++count;
1109 }
1110 }
1111 }
1112 }
1113 cli_print(cli, "%d entries in cache", count);
1114 return CLI_OK;
1115 }
1116
1117
1118 // Find session by username, 0 for not found
1119 // walled garden users aren't authenticated, so the username is
1120 // reasonably useless. Ignore them to avoid incorrect actions
1121 //
1122 // This is VERY inefficent. Don't call it often. :)
1123 //
1124 sessionidt sessionbyuser(char *username)
1125 {
1126 int s;
1127 CSTAT(sessionbyuser);
1128
1129 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1130 {
1131 if (!session[s].opened)
1132 continue;
1133
1134 if (session[s].walled_garden)
1135 continue; // Skip walled garden users.
1136
1137 if (!strncmp(session[s].user, username, 128))
1138 return s;
1139
1140 }
1141 return 0; // Not found.
1142 }
1143
1144 void send_garp(in_addr_t ip)
1145 {
1146 int s;
1147 struct ifreq ifr;
1148 uint8_t mac[6];
1149
1150 s = socket(PF_INET, SOCK_DGRAM, 0);
1151 if (s < 0)
1152 {
1153 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1154 return;
1155 }
1156 memset(&ifr, 0, sizeof(ifr));
1157 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1158 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1159 {
1160 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1161 close(s);
1162 return;
1163 }
1164 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1165 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1166 {
1167 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1168 close(s);
1169 return;
1170 }
1171 close(s);
1172 sendarp(ifr.ifr_ifindex, mac, ip);
1173 }
1174
1175 static sessiont *sessiontbysessionidt(sessionidt s)
1176 {
1177 if (!s || s >= MAXSESSION) return NULL;
1178 return &session[s];
1179 }
1180
1181 static sessionidt sessionidtbysessiont(sessiont *s)
1182 {
1183 sessionidt val = s-session;
1184 if (s < session || val >= MAXSESSION) return 0;
1185 return val;
1186 }
1187
1188 // actually send a control message for a specific tunnel
1189 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1190 {
1191 struct sockaddr_in addr;
1192
1193 CSTAT(tunnelsend);
1194
1195 if (!t)
1196 {
1197 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1198 STAT(tunnel_tx_errors);
1199 return;
1200 }
1201
1202 if (t == TUNNEL_ID_PPPOE)
1203 {
1204 pppoe_sess_send(buf, l, t);
1205 return;
1206 }
1207
1208 if (!tunnel[t].ip)
1209 {
1210 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1211 STAT(tunnel_tx_errors);
1212 return;
1213 }
1214
1215 memset(&addr, 0, sizeof(addr));
1216 addr.sin_family = AF_INET;
1217 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1218 addr.sin_port = htons(tunnel[t].port);
1219
1220 // sequence expected, if sequence in message
1221 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1222
1223 // If this is a control message, deal with retries
1224 if (*buf & 0x80)
1225 {
1226 tunnel[t].last = time_now; // control message sent
1227 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1228 if (tunnel[t].try)
1229 {
1230 STAT(tunnel_retries);
1231 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1232 }
1233 }
1234 #ifdef LAC
1235 if (sendto((tunnel[t].isremotelns?udplacfd:udpfd), buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1236 #else
1237 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1238 #endif
1239 {
1240 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1241 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1242 STAT(tunnel_tx_errors);
1243 return;
1244 }
1245
1246 LOG_HEX(5, "Send Tunnel Data", buf, l);
1247 STAT(tunnel_tx_packets);
1248 INC_STAT(tunnel_tx_bytes, l);
1249 }
1250
1251 //
1252 // Tiny helper function to write data to
1253 // the 'tun' device.
1254 //
1255 int tun_write(uint8_t * data, int size)
1256 {
1257 return write(tunfd, data, size);
1258 }
1259
1260 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1261 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1262 {
1263 int d = (tcp[12] >> 4) * 4;
1264 uint8_t *mss = 0;
1265 uint8_t *opts;
1266 uint8_t *data;
1267 uint16_t orig;
1268 uint32_t sum;
1269
1270 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1271 return;
1272
1273 if (tcp + d > buf + len) // short?
1274 return;
1275
1276 opts = tcp + 20;
1277 data = tcp + d;
1278
1279 while (opts < data)
1280 {
1281 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1282 {
1283 mss = opts + 2;
1284 if (mss + 2 > data) return; // short?
1285 break;
1286 }
1287
1288 if (*opts == 0) return; // end of options
1289 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1290 opts++;
1291 else
1292 opts += opts[1]; // skip over option
1293 }
1294
1295 if (!mss) return; // not found
1296 orig = ntohs(*(uint16_t *) mss);
1297
1298 if (orig <= MSS) return; // mss OK
1299
1300 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1301 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1302 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1303 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1304
1305 // set mss
1306 *(int16_t *) mss = htons(MSS);
1307
1308 // adjust checksum (see rfc1141)
1309 sum = orig + (~MSS & 0xffff);
1310 sum += ntohs(*(uint16_t *) (tcp + 16));
1311 sum = (sum & 0xffff) + (sum >> 16);
1312 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1313 }
1314
1315 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1316 {
1317 uint16_t proto;
1318 if (extra) {
1319 // Skip the four extra bytes
1320 p += 4;
1321 l -= 4;
1322 }
1323
1324 if (*p & 1)
1325 {
1326 proto = *p++;
1327 l--;
1328 }
1329 else
1330 {
1331 proto = ntohs(*(uint16_t *) p);
1332 p += 2;
1333 l -= 2;
1334 }
1335 if (proto == PPPIP)
1336 {
1337 if (session[s].die)
1338 {
1339 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1340 return; // closing session, PPP not processed
1341 }
1342 session[s].last_packet = session[s].last_data = time_now;
1343 processipin(s, t, p, l);
1344 }
1345 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1346 {
1347 if (session[s].die)
1348 {
1349 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1350 return; // closing session, PPP not processed
1351 }
1352
1353 session[s].last_packet = session[s].last_data = time_now;
1354 processipv6in(s, t, p, l);
1355 }
1356 else if (proto == PPPIPCP)
1357 {
1358 session[s].last_packet = session[s].last_data = time_now;
1359 processipcp(s, t, p, l);
1360 }
1361 else if (proto == PPPCCP)
1362 {
1363 session[s].last_packet = session[s].last_data = time_now;
1364 processccp(s, t, p, l);
1365 }
1366 else
1367 {
1368 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1369 }
1370 }
1371
1372 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1373 {
1374 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1375 sp->cout_delta += len;
1376 sp->pout++;
1377 sp->last_data = time_now;
1378
1379 sess_local[s].cout += len; // To send to master..
1380 sess_local[s].pout++;
1381 }
1382
1383 // process outgoing (to tunnel) IP
1384 //
1385 // (i.e. this routine writes to data[-8]).
1386 void processipout(uint8_t *buf, int len)
1387 {
1388 sessionidt s;
1389 sessiont *sp;
1390 tunnelidt t;
1391 in_addr_t ip;
1392
1393 uint8_t *data = buf; // Keep a copy of the originals.
1394 int size = len;
1395
1396 uint8_t fragbuf[MAXETHER + 20];
1397
1398 CSTAT(processipout);
1399
1400 if (len < MIN_IP_SIZE)
1401 {
1402 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1403 STAT(tun_rx_errors);
1404 return;
1405 }
1406 if (len >= MAXETHER)
1407 {
1408 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1409 STAT(tun_rx_errors);
1410 return;
1411 }
1412
1413 // Skip the tun header
1414 buf += 4;
1415 len -= 4;
1416
1417 // Got an IP header now
1418 if (*(uint8_t *)(buf) >> 4 != 4)
1419 {
1420 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1421 return;
1422 }
1423
1424 ip = *(uint32_t *)(buf + 16);
1425 if (!(s = sessionbyip(ip)))
1426 {
1427 // Is this a packet for a session that doesn't exist?
1428 static int rate = 0; // Number of ICMP packets we've sent this second.
1429 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1430
1431 if (last != time_now)
1432 {
1433 last = time_now;
1434 rate = 0;
1435 }
1436
1437 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1438 {
1439 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1440 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1441 config->bind_address ? config->bind_address : my_address, buf, len);
1442 }
1443 return;
1444 }
1445
1446 t = session[s].tunnel;
1447 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1448 {
1449 LOG(3, s, t, "Packet size more than session MRU\n");
1450 return;
1451 }
1452
1453 sp = &session[s];
1454
1455 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1456 if (config->max_packets > 0)
1457 {
1458 if (sess_local[s].last_packet_out == TIME)
1459 {
1460 int max = config->max_packets;
1461
1462 // All packets for throttled sessions are handled by the
1463 // master, so further limit by using the throttle rate.
1464 // A bit of a kludge, since throttle rate is in kbps,
1465 // but should still be generous given our average DSL
1466 // packet size is 200 bytes: a limit of 28kbps equates
1467 // to around 180 packets per second.
1468 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1469 max = sp->throttle_out;
1470
1471 if (++sess_local[s].packets_out > max)
1472 {
1473 sess_local[s].packets_dropped++;
1474 return;
1475 }
1476 }
1477 else
1478 {
1479 if (sess_local[s].packets_dropped)
1480 {
1481 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1482 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1483 sess_local[s].packets_dropped, sess_local[s].packets_out,
1484 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1485 sp->user);
1486 }
1487
1488 sess_local[s].last_packet_out = TIME;
1489 sess_local[s].packets_out = 1;
1490 sess_local[s].packets_dropped = 0;
1491 }
1492 }
1493
1494 // run access-list if any
1495 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1496 return;
1497
1498 // adjust MSS on SYN and SYN,ACK packets with options
1499 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1500 {
1501 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1502 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1503 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1504 }
1505
1506 if (sp->tbf_out)
1507 {
1508 // Are we throttling this session?
1509 if (config->cluster_iam_master)
1510 tbf_queue_packet(sp->tbf_out, data, size);
1511 else
1512 master_throttle_packet(sp->tbf_out, data, size);
1513 return;
1514 }
1515
1516 if (sp->walled_garden && !config->cluster_iam_master)
1517 {
1518 // We are walled-gardening this
1519 master_garden_packet(s, data, size);
1520 return;
1521 }
1522
1523 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1524 {
1525
1526 if (!config->cluster_iam_master)
1527 {
1528 // The MPPP packets must be managed by the Master.
1529 master_forward_mppp_packet(s, data, size);
1530 return;
1531 }
1532
1533 // Add on L2TP header
1534 sessionidt members[MAXBUNDLESES];
1535 bundleidt bid = session[s].bundle;
1536 bundlet *b = &bundle[bid];
1537 uint32_t num_of_links, nb_opened;
1538 int i;
1539
1540 num_of_links = b->num_of_links;
1541 nb_opened = 0;
1542 for (i = 0;i < num_of_links;i++)
1543 {
1544 s = b->members[i];
1545 if (session[s].ppp.lcp == Opened)
1546 {
1547 members[nb_opened] = s;
1548 nb_opened++;
1549 }
1550 }
1551
1552 if (nb_opened < 1)
1553 {
1554 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1555 return;
1556 }
1557
1558 num_of_links = nb_opened;
1559 b->current_ses = (b->current_ses + 1) % num_of_links;
1560 s = members[b->current_ses];
1561 t = session[s].tunnel;
1562 sp = &session[s];
1563 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1564
1565 if (num_of_links > 1)
1566 {
1567 if(len > MINFRAGLEN)
1568 {
1569 //for rotate traffic among the member links
1570 uint32_t divisor = num_of_links;
1571 if (divisor > 2)
1572 divisor = divisor/2 + (divisor & 1);
1573
1574 // Partition the packet to "num_of_links" fragments
1575 uint32_t fraglen = len / divisor;
1576 uint32_t last_fraglen = fraglen + len % divisor;
1577 uint32_t remain = len;
1578
1579 // send the first packet
1580 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1581 if (!p) return;
1582 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1583
1584 // statistics
1585 update_session_out_stat(s, sp, fraglen);
1586
1587 remain -= fraglen;
1588 while (remain > last_fraglen)
1589 {
1590 b->current_ses = (b->current_ses + 1) % num_of_links;
1591 s = members[b->current_ses];
1592 t = session[s].tunnel;
1593 sp = &session[s];
1594 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1595 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1596 if (!p) return;
1597 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1598 update_session_out_stat(s, sp, fraglen);
1599 remain -= fraglen;
1600 }
1601 // send the last fragment
1602 b->current_ses = (b->current_ses + 1) % num_of_links;
1603 s = members[b->current_ses];
1604 t = session[s].tunnel;
1605 sp = &session[s];
1606 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1607 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1608 if (!p) return;
1609 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1610 update_session_out_stat(s, sp, remain);
1611 if (remain != last_fraglen)
1612 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1613 }
1614 else
1615 {
1616 // Send it as one frame
1617 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1618 if (!p) return;
1619 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1620 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1621 update_session_out_stat(s, sp, len);
1622 }
1623 }
1624 else
1625 {
1626 // Send it as one frame (NO MPPP Frame)
1627 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1628 if (!p) return;
1629 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1630 update_session_out_stat(s, sp, len);
1631 }
1632 }
1633 else
1634 {
1635 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1636 if (!p) return;
1637 tunnelsend(fragbuf, len + (p-fragbuf), 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 c->buf16[c->length/2 + 0] = htons(l);
1823 c->buf16[c->length/2 + 1] = htons(0);
1824 c->buf16[c->length/2 + 2] = htons(avp);
1825 c->buf16[c->length/2 + 3] = 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 c->buf16[c->length/2 + 0] = htons(l);
1834 c->buf16[c->length/2 + 1] = htons(0);
1835 c->buf16[c->length/2 + 2] = 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 c->buf16[c->length/2 + 0] = htons(l);
1845 c->buf16[c->length/2 + 1] = htons(0);
1846 c->buf16[c->length/2 + 2] = 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 c->buf16[c->length/2 + 0] = htons(l);
1856 c->buf16[c->length/2 + 1] = htons(0);
1857 c->buf16[c->length/2 + 2] = 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->buf16[0] = htons(0xC802); // flags/ver
1876 c->length = 12;
1877 control16(c, 0, mtype, 1);
1878 return c;
1879 }
1880
1881 // send zero block if nothing is waiting
1882 // (ZLB send).
1883 static void controlnull(tunnelidt t)
1884 {
1885 uint16_t buf[6];
1886 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1887 return;
1888
1889 buf[0] = htons(0xC802); // flags/ver
1890 buf[1] = htons(12); // length
1891 buf[2] = htons(tunnel[t].far); // tunnel
1892 buf[3] = htons(0); // session
1893 buf[4] = htons(tunnel[t].ns); // sequence
1894 buf[5] = htons(tunnel[t].nr); // sequence
1895 tunnelsend((uint8_t *)buf, 12, t);
1896 }
1897
1898 // add a control message to a tunnel, and send if within window
1899 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1900 {
1901 c->buf16[1] = htons(c->length); // length
1902 c->buf16[2] = htons(tunnel[t].far); // tunnel
1903 c->buf16[3] = htons(far); // session
1904 c->buf16[4] = htons(tunnel[t].ns); // sequence
1905 tunnel[t].ns++; // advance sequence
1906 // link in message in to queue
1907 if (tunnel[t].controlc)
1908 tunnel[t].controle->next = c;
1909 else
1910 tunnel[t].controls = c;
1911
1912 tunnel[t].controle = c;
1913 tunnel[t].controlc++;
1914
1915 // send now if space in window
1916 if (tunnel[t].controlc <= tunnel[t].window)
1917 {
1918 tunnel[t].try = 0; // first send
1919 tunnelsend(c->buf, c->length, t);
1920 }
1921 }
1922
1923 //
1924 // Throttle or Unthrottle a session
1925 //
1926 // Throttle the data from/to through a session to no more than
1927 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1928 // user).
1929 //
1930 // If either value is -1, the current value is retained for that
1931 // direction.
1932 //
1933 void throttle_session(sessionidt s, int rate_in, int rate_out)
1934 {
1935 if (!session[s].opened)
1936 return; // No-one home.
1937
1938 if (!*session[s].user)
1939 return; // User not logged in
1940
1941 if (rate_in >= 0)
1942 {
1943 int bytes = rate_in * 1024 / 8; // kbits to bytes
1944 if (session[s].tbf_in)
1945 free_tbf(session[s].tbf_in);
1946
1947 if (rate_in > 0)
1948 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1949 else
1950 session[s].tbf_in = 0;
1951
1952 session[s].throttle_in = rate_in;
1953 }
1954
1955 if (rate_out >= 0)
1956 {
1957 int bytes = rate_out * 1024 / 8;
1958 if (session[s].tbf_out)
1959 free_tbf(session[s].tbf_out);
1960
1961 if (rate_out > 0)
1962 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1963 else
1964 session[s].tbf_out = 0;
1965
1966 session[s].throttle_out = rate_out;
1967 }
1968 }
1969
1970 // add/remove filters from session (-1 = no change)
1971 void filter_session(sessionidt s, int filter_in, int filter_out)
1972 {
1973 if (!session[s].opened)
1974 return; // No-one home.
1975
1976 if (!*session[s].user)
1977 return; // User not logged in
1978
1979 // paranoia
1980 if (filter_in > MAXFILTER) filter_in = -1;
1981 if (filter_out > MAXFILTER) filter_out = -1;
1982 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1983 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1984
1985 if (filter_in >= 0)
1986 {
1987 if (session[s].filter_in)
1988 ip_filters[session[s].filter_in - 1].used--;
1989
1990 if (filter_in > 0)
1991 ip_filters[filter_in - 1].used++;
1992
1993 session[s].filter_in = filter_in;
1994 }
1995
1996 if (filter_out >= 0)
1997 {
1998 if (session[s].filter_out)
1999 ip_filters[session[s].filter_out - 1].used--;
2000
2001 if (filter_out > 0)
2002 ip_filters[filter_out - 1].used++;
2003
2004 session[s].filter_out = filter_out;
2005 }
2006 }
2007
2008 // start tidy shutdown of session
2009 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2010 {
2011 int walled_garden = session[s].walled_garden;
2012 bundleidt b = session[s].bundle;
2013 //delete routes only for last session in bundle (in case of MPPP)
2014 int del_routes = !b || (bundle[b].num_of_links == 1);
2015
2016 CSTAT(sessionshutdown);
2017
2018 if (!session[s].opened)
2019 {
2020 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2021 return; // not a live session
2022 }
2023
2024 if (!session[s].die)
2025 {
2026 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2027 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2028 run_plugins(PLUGIN_KILL_SESSION, &data);
2029 session[s].die = TIME + 150; // Clean up in 15 seconds
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].ip)
2055 { // IP allocated, clear and unroute
2056 int r;
2057 int routed = 0;
2058 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2059 {
2060 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2061 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2062 routed++;
2063
2064 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2065 session[s].route[r].ip = 0;
2066 }
2067
2068 if (session[s].ip_pool_index == -1) // static ip
2069 {
2070 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2071 session[s].ip = 0;
2072 }
2073 else
2074 free_ip_address(s);
2075
2076 // unroute IPv6, if setup
2077 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2078 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2079
2080 if (b)
2081 {
2082 // This session was part of a bundle
2083 bundle[b].num_of_links--;
2084 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2085 if(bundle[b].num_of_links == 0)
2086 {
2087 bundleclear(b);
2088 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2089 }
2090 else
2091 {
2092 // Adjust the members array to accomodate the new change
2093 uint8_t mem_num = 0;
2094 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2095 if(bundle[b].members[bundle[b].num_of_links] != s)
2096 {
2097 uint8_t ml;
2098 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2099 if(bundle[b].members[ml] == s)
2100 {
2101 mem_num = ml;
2102 break;
2103 }
2104 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2105 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2106
2107 // If the killed session is the first of the bundle,
2108 // the new first session must be stored in the cache_ipmap
2109 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2110 if (mem_num == 0)
2111 {
2112 sessionidt new_s = bundle[b].members[0];
2113
2114 routed = 0;
2115 // Add the route for this session.
2116 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2117 {
2118 int i, prefixlen;
2119 in_addr_t ip;
2120
2121 prefixlen = session[new_s].route[r].prefixlen;
2122 ip = session[new_s].route[r].ip;
2123
2124 if (!prefixlen) prefixlen = 32;
2125 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2126
2127 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2128 cache_ipmap(i, new_s);
2129 }
2130 cache_ipmap(session[new_s].ip, new_s);
2131
2132 // IPV6 route
2133 if (session[new_s].ipv6prefixlen)
2134 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2135 }
2136 }
2137 }
2138
2139 cluster_send_bundle(b);
2140 }
2141 }
2142
2143 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2144 throttle_session(s, 0, 0);
2145
2146 if (cdn_result)
2147 {
2148 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2149 {
2150 pppoe_shutdown_session(s);
2151 }
2152 else
2153 {
2154 // Send CDN
2155 controlt *c = controlnew(14); // sending CDN
2156 if (cdn_error)
2157 {
2158 uint16_t buf[2];
2159 buf[0] = htons(cdn_result);
2160 buf[1] = htons(cdn_error);
2161 controlb(c, 1, (uint8_t *)buf, 4, 1);
2162 }
2163 else
2164 control16(c, 1, cdn_result, 1);
2165
2166 control16(c, 14, s, 1); // assigned session (our end)
2167 controladd(c, session[s].far, session[s].tunnel); // send the message
2168 }
2169 }
2170
2171 // update filter refcounts
2172 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2173 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2174
2175 // clear PPP state
2176 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2177 sess_local[s].lcp.restart = 0;
2178 sess_local[s].ipcp.restart = 0;
2179 sess_local[s].ipv6cp.restart = 0;
2180 sess_local[s].ccp.restart = 0;
2181
2182 cluster_send_session(s);
2183 }
2184
2185 void sendipcp(sessionidt s, tunnelidt t)
2186 {
2187 uint8_t buf[MAXETHER];
2188 uint8_t *q;
2189
2190 CSTAT(sendipcp);
2191 LOG(3, s, t, "IPCP: send ConfigReq\n");
2192
2193 if (!session[s].unique_id)
2194 {
2195 if (!++last_id) ++last_id; // skip zero
2196 session[s].unique_id = last_id;
2197 }
2198
2199 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2200 if (!q) return;
2201
2202 *q = ConfigReq;
2203 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2204 *(uint16_t *) (q + 2) = htons(10); // packet length
2205 q[4] = 3; // ip address option
2206 q[5] = 6; // option length
2207 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2208 config->iftun_address ? config->iftun_address :
2209 my_address; // send my IP
2210
2211 tunnelsend(buf, 10 + (q - buf), t); // send it
2212 restart_timer(s, ipcp);
2213 }
2214
2215 void sendipv6cp(sessionidt s, tunnelidt t)
2216 {
2217 uint8_t buf[MAXETHER];
2218 uint8_t *q;
2219
2220 CSTAT(sendipv6cp);
2221 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2222
2223 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2224 if (!q) return;
2225
2226 *q = ConfigReq;
2227 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2228 // only send one type
2229 // of request
2230 *(uint16_t *) (q + 2) = htons(14);
2231 q[4] = 1; // interface identifier option
2232 q[5] = 10; // option length
2233 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2234 *(uint32_t *) (q + 10) = 0;
2235 q[13] = 1;
2236
2237 tunnelsend(buf, 14 + (q - buf), t); // send it
2238 restart_timer(s, ipv6cp);
2239 }
2240
2241 static void sessionclear(sessionidt s)
2242 {
2243 memset(&session[s], 0, sizeof(session[s]));
2244 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2245 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2246
2247 session[s].tunnel = T_FREE; // Mark it as free.
2248 session[s].next = sessionfree;
2249 sessionfree = s;
2250 }
2251
2252 // kill a session now
2253 void sessionkill(sessionidt s, char *reason)
2254 {
2255 CSTAT(sessionkill);
2256
2257 if (!session[s].opened) // not alive
2258 return;
2259
2260 if (session[s].next)
2261 {
2262 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2263 return;
2264 }
2265
2266 if (!session[s].die)
2267 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2268
2269 if (sess_local[s].radius)
2270 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2271
2272 #ifdef LAC
2273 if (session[s].forwardtosession)
2274 {
2275 sessionidt sess = session[s].forwardtosession;
2276 if (session[sess].forwardtosession == s)
2277 {
2278 // Shutdown the linked session also.
2279 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2280 }
2281 }
2282 #endif
2283
2284 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2285 sessionclear(s);
2286 cluster_send_session(s);
2287 }
2288
2289 static void tunnelclear(tunnelidt t)
2290 {
2291 if (!t) return;
2292 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2293 tunnel[t].state = TUNNELFREE;
2294 }
2295
2296 static void bundleclear(bundleidt b)
2297 {
2298 if (!b) return;
2299 memset(&bundle[b], 0, sizeof(bundle[b]));
2300 bundle[b].state = BUNDLEFREE;
2301 }
2302
2303 // kill a tunnel now
2304 static void tunnelkill(tunnelidt t, char *reason)
2305 {
2306 sessionidt s;
2307 controlt *c;
2308
2309 CSTAT(tunnelkill);
2310
2311 tunnel[t].state = TUNNELDIE;
2312
2313 // free control messages
2314 while ((c = tunnel[t].controls))
2315 {
2316 controlt * n = c->next;
2317 tunnel[t].controls = n;
2318 tunnel[t].controlc--;
2319 c->next = controlfree;
2320 controlfree = c;
2321 }
2322 // kill sessions
2323 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2324 if (session[s].tunnel == t)
2325 sessionkill(s, reason);
2326
2327 // free tunnel
2328 tunnelclear(t);
2329 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2330 cli_tunnel_actions[t].action = 0;
2331 cluster_send_tunnel(t);
2332 }
2333
2334 // shut down a tunnel cleanly
2335 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2336 {
2337 sessionidt s;
2338
2339 CSTAT(tunnelshutdown);
2340
2341 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2342 {
2343 // never set up, can immediately kill
2344 tunnelkill(t, reason);
2345 return;
2346 }
2347 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2348
2349 // close session
2350 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2351 if (session[s].tunnel == t)
2352 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2353
2354 tunnel[t].state = TUNNELDIE;
2355 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2356 cluster_send_tunnel(t);
2357 // TBA - should we wait for sessions to stop?
2358 if (result)
2359 {
2360 controlt *c = controlnew(4); // sending StopCCN
2361 if (error)
2362 {
2363 uint16_t buf[32];
2364 int l = 4;
2365 buf[0] = htons(result);
2366 buf[1] = htons(error);
2367 if (msg)
2368 {
2369 int m = strlen(msg);
2370 if (m + 4 > sizeof(buf))
2371 m = sizeof(buf) - 4;
2372
2373 memcpy(buf+2, msg, m);
2374 l += m;
2375 }
2376
2377 controlb(c, 1, (uint8_t *)buf, l, 1);
2378 }
2379 else
2380 control16(c, 1, result, 1);
2381
2382 control16(c, 9, t, 1); // assigned tunnel (our end)
2383 controladd(c, 0, t); // send the message
2384 }
2385 }
2386
2387 // read and process packet on tunnel (UDP)
2388 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2389 {
2390 uint8_t *chapresponse = NULL;
2391 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2392 uint8_t *p = buf + 2;
2393
2394
2395 CSTAT(processudp);
2396
2397 udp_rx += len;
2398 udp_rx_pkt++;
2399 LOG_HEX(5, "UDP Data", buf, len);
2400 STAT(tunnel_rx_packets);
2401 INC_STAT(tunnel_rx_bytes, len);
2402 if (len < 6)
2403 {
2404 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2405 STAT(tunnel_rx_errors);
2406 return;
2407 }
2408 if ((buf[1] & 0x0F) != 2)
2409 {
2410 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2411 STAT(tunnel_rx_errors);
2412 return;
2413 }
2414 if (*buf & 0x40)
2415 { // length
2416 l = ntohs(*(uint16_t *) p);
2417 p += 2;
2418 }
2419 t = ntohs(*(uint16_t *) p);
2420 p += 2;
2421 s = ntohs(*(uint16_t *) p);
2422 p += 2;
2423 if (s >= MAXSESSION)
2424 {
2425 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2426 STAT(tunnel_rx_errors);
2427 return;
2428 }
2429 if (t >= MAXTUNNEL)
2430 {
2431 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2432 STAT(tunnel_rx_errors);
2433 return;
2434 }
2435 if (t == TUNNEL_ID_PPPOE)
2436 {
2437 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2438 STAT(tunnel_rx_errors);
2439 return;
2440 }
2441 if (*buf & 0x08)
2442 { // ns/nr
2443 ns = ntohs(*(uint16_t *) p);
2444 p += 2;
2445 nr = ntohs(*(uint16_t *) p);
2446 p += 2;
2447 }
2448 if (*buf & 0x02)
2449 { // offset
2450 uint16_t o = ntohs(*(uint16_t *) p);
2451 p += o + 2;
2452 }
2453 if ((p - buf) > l)
2454 {
2455 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2456 STAT(tunnel_rx_errors);
2457 return;
2458 }
2459 l -= (p - buf);
2460
2461 // used to time out old tunnels
2462 if (t && tunnel[t].state == TUNNELOPEN)
2463 tunnel[t].lastrec = time_now;
2464
2465 if (*buf & 0x80)
2466 { // control
2467 uint16_t message = 0xFFFF; // message type
2468 uint8_t fatal = 0;
2469 uint8_t mandatory = 0;
2470 uint16_t asession = 0; // assigned session
2471 uint32_t amagic = 0; // magic number
2472 uint8_t aflags = 0; // flags from last LCF
2473 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2474 char called[MAXTEL] = ""; // called number
2475 char calling[MAXTEL] = ""; // calling number
2476
2477 if (!config->cluster_iam_master)
2478 {
2479 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2480 return;
2481 }
2482
2483 // control messages must have bits 0x80|0x40|0x08
2484 // (type, length and sequence) set, and bits 0x02|0x01
2485 // (offset and priority) clear
2486 if ((*buf & 0xCB) != 0xC8)
2487 {
2488 LOG(1, s, t, "Bad control header %02X\n", *buf);
2489 STAT(tunnel_rx_errors);
2490 return;
2491 }
2492
2493 // check for duplicate tunnel open message
2494 if (!t && ns == 0)
2495 {
2496 int i;
2497
2498 //
2499 // Is this a duplicate of the first packet? (SCCRQ)
2500 //
2501 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2502 {
2503 if (tunnel[i].state != TUNNELOPENING ||
2504 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2505 tunnel[i].port != ntohs(addr->sin_port) )
2506 continue;
2507 t = i;
2508 LOG(3, s, t, "Duplicate SCCRQ?\n");
2509 break;
2510 }
2511 }
2512
2513 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2514 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2515
2516 // if no tunnel specified, assign one
2517 if (!t)
2518 {
2519 if (!(t = new_tunnel()))
2520 {
2521 LOG(1, 0, 0, "No more tunnels\n");
2522 STAT(tunnel_overflow);
2523 return;
2524 }
2525 tunnelclear(t);
2526 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2527 tunnel[t].port = ntohs(addr->sin_port);
2528 tunnel[t].window = 4; // default window
2529 STAT(tunnel_created);
2530 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2531 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2532 }
2533
2534 // If the 'ns' just received is not the 'nr' we're
2535 // expecting, just send an ack and drop it.
2536 //
2537 // if 'ns' is less, then we got a retransmitted packet.
2538 // if 'ns' is greater than missed a packet. Either way
2539 // we should ignore it.
2540 if (ns != tunnel[t].nr)
2541 {
2542 // is this the sequence we were expecting?
2543 STAT(tunnel_rx_errors);
2544 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2545 t, ns, tunnel[t].nr);
2546
2547 if (l) // Is this not a ZLB?
2548 controlnull(t);
2549 return;
2550 }
2551
2552 // check sequence of this message
2553 {
2554 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2555 // some to clear maybe?
2556 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2557 {
2558 controlt *c = tunnel[t].controls;
2559 tunnel[t].controls = c->next;
2560 tunnel[t].controlc--;
2561 c->next = controlfree;
2562 controlfree = c;
2563 skip--;
2564 tunnel[t].try = 0; // we have progress
2565 }
2566
2567 // receiver advance (do here so quoted correctly in any sends below)
2568 if (l) tunnel[t].nr = (ns + 1);
2569 if (skip < 0) skip = 0;
2570 if (skip < tunnel[t].controlc)
2571 {
2572 // some control packets can now be sent that were previous stuck out of window
2573 int tosend = tunnel[t].window - skip;
2574 controlt *c = tunnel[t].controls;
2575 while (c && skip)
2576 {
2577 c = c->next;
2578 skip--;
2579 }
2580 while (c && tosend)
2581 {
2582 tunnel[t].try = 0; // first send
2583 tunnelsend(c->buf, c->length, t);
2584 c = c->next;
2585 tosend--;
2586 }
2587 }
2588 if (!tunnel[t].controlc)
2589 tunnel[t].retry = 0; // caught up
2590 }
2591 if (l)
2592 { // if not a null message
2593 int result = 0;
2594 int error = 0;
2595 char *msg = 0;
2596
2597 // Default disconnect cause/message on receipt of CDN. Set to
2598 // more specific value from attribute 1 (result code) or 46
2599 // (disconnect cause) if present below.
2600 int disc_cause_set = 0;
2601 int disc_cause = TERM_NAS_REQUEST;
2602 char const *disc_reason = "Closed (Received CDN).";
2603
2604 // process AVPs
2605 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2606 {
2607 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2608 uint8_t *b = p;
2609 uint8_t flags = *p;
2610 uint16_t mtype;
2611
2612 if (n > l)
2613 {
2614 LOG(1, s, t, "Invalid length in AVP\n");
2615 STAT(tunnel_rx_errors);
2616 return;
2617 }
2618 p += n; // next
2619 l -= n;
2620 if (flags & 0x3C) // reserved bits, should be clear
2621 {
2622 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2623 fatal = flags;
2624 result = 2; // general error
2625 error = 3; // reserved field non-zero
2626 msg = 0;
2627 continue; // next
2628 }
2629 b += 2;
2630 if (*(uint16_t *) (b))
2631 {
2632 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2633 fatal = flags;
2634 result = 2; // general error
2635 error = 6; // generic vendor-specific error
2636 msg = "unsupported vendor-specific";
2637 continue; // next
2638 }
2639 b += 2;
2640 mtype = ntohs(*(uint16_t *) (b));
2641 b += 2;
2642 n -= 6;
2643
2644 if (flags & 0x40)
2645 {
2646 uint16_t orig_len;
2647
2648 // handle hidden AVPs
2649 if (!*config->l2tp_secret)
2650 {
2651 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2652 fatal = flags;
2653 result = 2; // general error
2654 error = 6; // generic vendor-specific error
2655 msg = "secret not specified";
2656 continue;
2657 }
2658 if (!session[s].random_vector_length)
2659 {
2660 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2661 fatal = flags;
2662 result = 2; // general error
2663 error = 6; // generic
2664 msg = "no random vector";
2665 continue;
2666 }
2667 if (n < 8)
2668 {
2669 LOG(2, s, t, "Short hidden AVP.\n");
2670 fatal = flags;
2671 result = 2; // general error
2672 error = 2; // length is wrong
2673 msg = 0;
2674 continue;
2675 }
2676
2677 // Unhide the AVP
2678 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2679
2680 orig_len = ntohs(*(uint16_t *) b);
2681 if (orig_len > n + 2)
2682 {
2683 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2684 orig_len, n);
2685
2686 fatal = flags;
2687 result = 2; // general error
2688 error = 2; // length is wrong
2689 msg = 0;
2690 continue;
2691 }
2692
2693 b += 2;
2694 n = orig_len;
2695 }
2696
2697 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2698 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2699
2700 switch (mtype)
2701 {
2702 case 0: // message type
2703 message = ntohs(*(uint16_t *) b);
2704 mandatory = flags & 0x80;
2705 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2706 break;
2707 case 1: // result code
2708 {
2709 uint16_t rescode = ntohs(*(uint16_t *) b);
2710 char const *resdesc = "(unknown)";
2711 char const *errdesc = NULL;
2712 int cause = 0;
2713
2714 if (message == 4)
2715 { /* StopCCN */
2716 resdesc = l2tp_stopccn_result_code(rescode);
2717 cause = TERM_LOST_SERVICE;
2718 }
2719 else if (message == 14)
2720 { /* CDN */
2721 resdesc = l2tp_cdn_result_code(rescode);
2722 if (rescode == 1)
2723 cause = TERM_LOST_CARRIER;
2724 else
2725 cause = TERM_ADMIN_RESET;
2726 }
2727
2728 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2729 if (n >= 4)
2730 {
2731 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2732 errdesc = l2tp_error_code(errcode);
2733 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2734 }
2735 if (n > 4)
2736 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2737
2738 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2739 {
2740 disc_cause_set = mtype;
2741 disc_reason = errdesc ? errdesc : resdesc;
2742 disc_cause = cause;
2743 }
2744
2745 break;
2746 }
2747 break;
2748 case 2: // protocol version
2749 {
2750 version = ntohs(*(uint16_t *) (b));
2751 LOG(4, s, t, " Protocol version = %u\n", version);
2752 if (version && version != 0x0100)
2753 { // allow 0.0 and 1.0
2754 LOG(1, s, t, " Bad protocol version %04X\n", version);
2755 fatal = flags;
2756 result = 5; // unspported protocol version
2757 error = 0x0100; // supported version
2758 msg = 0;
2759 continue; // next
2760 }
2761 }
2762 break;
2763 case 3: // framing capabilities
2764 break;
2765 case 4: // bearer capabilities
2766 break;
2767 case 5: // tie breaker
2768 // We never open tunnels, so we don't care about tie breakers
2769 continue;
2770 case 6: // firmware revision
2771 break;
2772 case 7: // host name
2773 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2774 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2775 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2776 // TBA - to send to RADIUS
2777 break;
2778 case 8: // vendor name
2779 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2780 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2781 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2782 break;
2783 case 9: // assigned tunnel
2784 tunnel[t].far = ntohs(*(uint16_t *) (b));
2785 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2786 break;
2787 case 10: // rx window
2788 tunnel[t].window = ntohs(*(uint16_t *) (b));
2789 if (!tunnel[t].window)
2790 tunnel[t].window = 1; // window of 0 is silly
2791 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2792 break;
2793 case 11: // Challenge
2794 {
2795 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2796 build_chap_response(b, 2, n, &chapresponse);
2797 }
2798 break;
2799 case 13: // Response
2800 #ifdef LAC
2801 if (tunnel[t].isremotelns)
2802 {
2803 chapresponse = calloc(17, 1);
2804 memcpy(chapresponse, b, (n < 17) ? n : 16);
2805 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2806 }
2807 else
2808 #endif /* LAC */
2809 // Why did they send a response? We never challenge.
2810 LOG(2, s, t, " received unexpected challenge response\n");
2811 break;
2812
2813 case 14: // assigned session
2814 asession = session[s].far = ntohs(*(uint16_t *) (b));
2815 LOG(4, s, t, " assigned session = %u\n", asession);
2816 break;
2817 case 15: // call serial number
2818 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2819 break;
2820 case 18: // bearer type
2821 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2822 // TBA - for RADIUS
2823 break;
2824 case 19: // framing type
2825 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2826 // TBA
2827 break;
2828 case 21: // called number
2829 memset(called, 0, sizeof(called));
2830 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2831 LOG(4, s, t, " Called <%s>\n", called);
2832 break;
2833 case 22: // calling number
2834 memset(calling, 0, sizeof(calling));
2835 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2836 LOG(4, s, t, " Calling <%s>\n", calling);
2837 break;
2838 case 23: // subtype
2839 break;
2840 case 24: // tx connect speed
2841 if (n == 4)
2842 {
2843 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2844 }
2845 else
2846 {
2847 // AS5300s send connect speed as a string
2848 char tmp[30];
2849 memset(tmp, 0, sizeof(tmp));
2850 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2851 session[s].tx_connect_speed = atol(tmp);
2852 }
2853 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2854 break;
2855 case 38: // rx connect speed
2856 if (n == 4)
2857 {
2858 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2859 }
2860 else
2861 {
2862 // AS5300s send connect speed as a string
2863 char tmp[30];
2864 memset(tmp, 0, sizeof(tmp));
2865 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2866 session[s].rx_connect_speed = atol(tmp);
2867 }
2868 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2869 break;
2870 case 25: // Physical Channel ID
2871 {
2872 uint32_t tmp = ntohl(*(uint32_t *) b);
2873 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2874 break;
2875 }
2876 case 29: // Proxy Authentication Type
2877 {
2878 uint16_t atype = ntohs(*(uint16_t *)b);
2879 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2880 break;
2881 }
2882 case 30: // Proxy Authentication Name
2883 {
2884 char authname[64];
2885 memset(authname, 0, sizeof(authname));
2886 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2887 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2888 authname);
2889 break;
2890 }
2891 case 31: // Proxy Authentication Challenge
2892 {
2893 LOG(4, s, t, " Proxy Auth Challenge\n");
2894 break;
2895 }
2896 case 32: // Proxy Authentication ID
2897 {
2898 uint16_t authid = ntohs(*(uint16_t *)(b));
2899 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2900 break;
2901 }
2902 case 33: // Proxy Authentication Response
2903 LOG(4, s, t, " Proxy Auth Response\n");
2904 break;
2905 case 27: // last sent lcp
2906 { // find magic number
2907 uint8_t *p = b, *e = p + n;
2908 while (p + 1 < e && p[1] && p + p[1] <= e)
2909 {
2910 if (*p == 5 && p[1] == 6) // Magic-Number
2911 amagic = ntohl(*(uint32_t *) (p + 2));
2912 else if (*p == 7) // Protocol-Field-Compression
2913 aflags |= SESSION_PFC;
2914 else if (*p == 8) // Address-and-Control-Field-Compression
2915 aflags |= SESSION_ACFC;
2916 p += p[1];
2917 }
2918 }
2919 break;
2920 case 28: // last recv lcp confreq
2921 break;
2922 case 26: // Initial Received LCP CONFREQ
2923 break;
2924 case 39: // seq required - we control it as an LNS anyway...
2925 break;
2926 case 36: // Random Vector
2927 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2928 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2929 if (n > sizeof(session[s].random_vector))
2930 n = sizeof(session[s].random_vector);
2931 memcpy(session[s].random_vector, b, n);
2932 session[s].random_vector_length = n;
2933 break;
2934 case 46: // ppp disconnect cause
2935 if (n >= 5)
2936 {
2937 uint16_t code = ntohs(*(uint16_t *) b);
2938 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2939 uint8_t dir = *(b + 4);
2940
2941 LOG(4, s, t, " PPP disconnect cause "
2942 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2943 code, proto, dir, n - 5, b + 5);
2944
2945 disc_cause_set = mtype;
2946
2947 switch (code)
2948 {
2949 case 1: // admin disconnect
2950 disc_cause = TERM_ADMIN_RESET;
2951 disc_reason = "Administrative disconnect";
2952 break;
2953 case 3: // lcp terminate
2954 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2955 disc_cause = TERM_USER_REQUEST;
2956 disc_reason = "Normal disconnection";
2957 break;
2958 case 4: // compulsory encryption unavailable
2959 if (dir != 1) break; // 1=refused by peer, 2=local
2960 disc_cause = TERM_USER_ERROR;
2961 disc_reason = "Compulsory encryption refused";
2962 break;
2963 case 5: // lcp: fsm timeout
2964 disc_cause = TERM_PORT_ERROR;
2965 disc_reason = "LCP: FSM timeout";
2966 break;
2967 case 6: // lcp: no recognisable lcp packets received
2968 disc_cause = TERM_PORT_ERROR;
2969 disc_reason = "LCP: no recognisable LCP packets";
2970 break;
2971 case 7: // lcp: magic-no error (possibly looped back)
2972 disc_cause = TERM_PORT_ERROR;
2973 disc_reason = "LCP: magic-no error (possible loop)";
2974 break;
2975 case 8: // lcp: echo request timeout
2976 disc_cause = TERM_PORT_ERROR;
2977 disc_reason = "LCP: echo request timeout";
2978 break;
2979 case 13: // auth: fsm timeout
2980 disc_cause = TERM_SERVICE_UNAVAILABLE;
2981 disc_reason = "Authentication: FSM timeout";
2982 break;
2983 case 15: // auth: unacceptable auth protocol
2984 disc_cause = TERM_SERVICE_UNAVAILABLE;
2985 disc_reason = "Unacceptable authentication protocol";
2986 break;
2987 case 16: // auth: authentication failed
2988 disc_cause = TERM_SERVICE_UNAVAILABLE;
2989 disc_reason = "Authentication failed";
2990 break;
2991 case 17: // ncp: fsm timeout
2992 disc_cause = TERM_SERVICE_UNAVAILABLE;
2993 disc_reason = "NCP: FSM timeout";
2994 break;
2995 case 18: // ncp: no ncps available
2996 disc_cause = TERM_SERVICE_UNAVAILABLE;
2997 disc_reason = "NCP: no NCPs available";
2998 break;
2999 case 19: // ncp: failure to converge on acceptable address
3000 disc_cause = TERM_SERVICE_UNAVAILABLE;
3001 disc_reason = (dir == 1)
3002 ? "NCP: too many Configure-Naks received from peer"
3003 : "NCP: too many Configure-Naks sent to peer";
3004 break;
3005 case 20: // ncp: user not permitted to use any address
3006 disc_cause = TERM_SERVICE_UNAVAILABLE;
3007 disc_reason = (dir == 1)
3008 ? "NCP: local link address not acceptable to peer"
3009 : "NCP: remote link address not acceptable";
3010 break;
3011 }
3012 }
3013 break;
3014 default:
3015 {
3016 static char e[] = "unknown AVP 0xXXXX";
3017 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3018 fatal = flags;
3019 result = 2; // general error
3020 error = 8; // unknown mandatory AVP
3021 sprintf((msg = e) + 14, "%04x", mtype);
3022 continue; // next
3023 }
3024 }
3025 }
3026 // process message
3027 if (fatal & 0x80)
3028 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3029 else
3030 switch (message)
3031 {
3032 case 1: // SCCRQ - Start Control Connection Request
3033 tunnel[t].state = TUNNELOPENING;
3034 LOG(3, s, t, "Received SCCRQ\n");
3035 if (main_quit != QUIT_SHUTDOWN)
3036 {
3037 LOG(3, s, t, "sending SCCRP\n");
3038 controlt *c = controlnew(2); // sending SCCRP
3039 control16(c, 2, version, 1); // protocol version
3040 control32(c, 3, 3, 1); // framing
3041 controls(c, 7, hostname, 1); // host name
3042 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
3043 control16(c, 9, t, 1); // assigned tunnel
3044 controladd(c, 0, t); // send the resply
3045 }
3046 else
3047 {
3048 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3049 }
3050 break;
3051 case 2: // SCCRP
3052 tunnel[t].state = TUNNELOPEN;
3053 tunnel[t].lastrec = time_now;
3054 #ifdef LAC
3055 LOG(3, s, t, "Received SCCRP\n");
3056 if (main_quit != QUIT_SHUTDOWN)
3057 {
3058 if (tunnel[t].isremotelns && chapresponse)
3059 {
3060 hasht hash;
3061
3062 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3063 // check authenticator
3064 if (memcmp(hash, chapresponse, 16) == 0)
3065 {
3066 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3067 controlt *c = controlnew(3); // sending SCCCN
3068 controls(c, 7, hostname, 1); // host name
3069 controls(c, 8, Vendor_name, 1); // Vendor name
3070 control16(c, 2, version, 1); // protocol version
3071 control32(c, 3, 3, 1); // framing Capabilities
3072 control16(c, 9, t, 1); // assigned tunnel
3073 controladd(c, 0, t); // send
3074 }
3075 else
3076 {
3077 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3078 }
3079 }
3080 }
3081 else
3082 {
3083 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3084 }
3085 #endif /* LAC */
3086 break;
3087 case 3: // SCCN
3088 LOG(3, s, t, "Received SCCN\n");
3089 tunnel[t].state = TUNNELOPEN;
3090 tunnel[t].lastrec = time_now;
3091 controlnull(t); // ack
3092 break;
3093 case 4: // StopCCN
3094 LOG(3, s, t, "Received StopCCN\n");
3095 controlnull(t); // ack
3096 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3097 break;
3098 case 6: // HELLO
3099 LOG(3, s, t, "Received HELLO\n");
3100 controlnull(t); // simply ACK
3101 break;
3102 case 7: // OCRQ
3103 // TBA
3104 LOG(3, s, t, "Received OCRQ\n");
3105 break;
3106 case 8: // OCRO
3107 // TBA
3108 LOG(3, s, t, "Received OCRO\n");
3109 break;
3110 case 9: // OCCN
3111 // TBA
3112 LOG(3, s, t, "Received OCCN\n");
3113 break;
3114 case 10: // ICRQ
3115 LOG(3, s, t, "Received ICRQ\n");
3116 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3117 {
3118 controlt *c = controlnew(11); // ICRP
3119
3120 LOG(3, s, t, "Sending ICRP\n");
3121
3122 s = sessionfree;
3123 sessionfree = session[s].next;
3124 memset(&session[s], 0, sizeof(session[s]));
3125
3126 if (s > config->cluster_highest_sessionid)
3127 config->cluster_highest_sessionid = s;
3128
3129 session[s].opened = time_now;
3130 session[s].tunnel = t;
3131 session[s].far = asession;
3132 session[s].last_packet = session[s].last_data = time_now;
3133 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3134 control16(c, 14, s, 1); // assigned session
3135 controladd(c, asession, t); // send the reply
3136
3137 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3138 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3139
3140 session[s].ppp.phase = Establish;
3141 session[s].ppp.lcp = Starting;
3142
3143 STAT(session_created);
3144 break;
3145 }
3146
3147 {
3148 controlt *c = controlnew(14); // CDN
3149 LOG(3, s, t, "Sending CDN\n");
3150 if (!sessionfree)
3151 {
3152 STAT(session_overflow);
3153 LOG(1, 0, t, "No free sessions\n");
3154 control16(c, 1, 4, 0); // temporary lack of resources
3155 }
3156 else
3157 control16(c, 1, 2, 7); // shutting down, try another
3158
3159 controladd(c, asession, t); // send the message
3160 }
3161 return;
3162 case 11: // ICRP
3163 #ifdef LAC
3164 LOG(3, s, t, "Received ICRP\n");
3165 if (session[s].forwardtosession)
3166 {
3167 controlt *c = controlnew(12); // ICCN
3168
3169 session[s].opened = time_now;
3170 session[s].tunnel = t;
3171 session[s].far = asession;
3172 session[s].last_packet = session[s].last_data = time_now;
3173
3174 control32(c, 19, 1, 1); // Framing Type
3175 control32(c, 24, 10000000, 1); // Tx Connect Speed
3176 controladd(c, asession, t); // send the message
3177 LOG(3, s, t, "Sending ICCN\n");
3178 }
3179 #endif /* LAC */
3180 break;
3181 case 12: // ICCN
3182 LOG(3, s, t, "Received ICCN\n");
3183 if (amagic == 0) amagic = time_now;
3184 session[s].magic = amagic; // set magic number
3185 session[s].flags = aflags; // set flags received
3186 session[s].mru = PPPoE_MRU; // default
3187 controlnull(t); // ack
3188
3189 // start LCP
3190 sess_local[s].lcp_authtype = config->radius_authprefer;
3191 sess_local[s].ppp_mru = MRU;
3192
3193 // Set multilink options before sending initial LCP packet
3194 sess_local[s].mp_mrru = 1614;
3195 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3196
3197 sendlcp(s, t);
3198 change_state(s, lcp, RequestSent);
3199 break;
3200
3201 case 14: // CDN
3202 LOG(3, s, t, "Received CDN\n");
3203 controlnull(t); // ack
3204 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3205 break;
3206 case 0xFFFF:
3207 LOG(1, s, t, "Missing message type\n");
3208 break;
3209 default:
3210 STAT(tunnel_rx_errors);
3211 if (mandatory)
3212 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3213 else
3214 LOG(1, s, t, "Unknown message type %u\n", message);
3215 break;
3216 }
3217 if (chapresponse) free(chapresponse);
3218 cluster_send_tunnel(t);
3219 }
3220 else
3221 {
3222 LOG(4, s, t, " Got a ZLB ack\n");
3223 }
3224 }
3225 else
3226 { // data
3227 uint16_t proto;
3228
3229 LOG_HEX(5, "Receive Tunnel Data", p, l);
3230 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3231 { // HDLC address header, discard
3232 p += 2;
3233 l -= 2;
3234 }
3235 if (l < 2)
3236 {
3237 LOG(1, s, t, "Short ppp length %d\n", l);
3238 STAT(tunnel_rx_errors);
3239 return;
3240 }
3241 if (*p & 1)
3242 {
3243 proto = *p++;
3244 l--;
3245 }
3246 else
3247 {
3248 proto = ntohs(*(uint16_t *) p);
3249 p += 2;
3250 l -= 2;
3251 }
3252
3253 #ifdef LAC
3254 if (session[s].forwardtosession)
3255 {
3256 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3257 // Forward to LAC/BAS or Remote LNS session
3258 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port);
3259 return;
3260 }
3261 else if (config->auth_tunnel_change_addr_src)
3262 {
3263 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3264 tunnel[t].port == ntohs(addr->sin_port))
3265 {
3266 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3267 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3268 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3269
3270 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3271 }
3272 }
3273 #endif /* LAC */
3274
3275 if (s && !session[s].opened) // Is something wrong??
3276 {
3277 if (!config->cluster_iam_master)
3278 {
3279 // Pass it off to the master to deal with..
3280 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3281 return;
3282 }
3283
3284 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3285 STAT(tunnel_rx_errors);
3286 return;
3287 }
3288
3289 if (proto == PPPPAP)
3290 {
3291 session[s].last_packet = time_now;
3292 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3293 processpap(s, t, p, l);
3294 }
3295 else if (proto == PPPCHAP)
3296 {
3297 session[s].last_packet = time_now;
3298 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3299 processchap(s, t, p, l);
3300 }
3301 else if (proto == PPPLCP)
3302 {
3303 session[s].last_packet = time_now;
3304 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3305 processlcp(s, t, p, l);
3306 }
3307 else if (proto == PPPIPCP)
3308 {
3309 session[s].last_packet = time_now;
3310 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3311 processipcp(s, t, p, l);
3312 }
3313 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3314 {
3315 session[s].last_packet = time_now;
3316 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3317 processipv6cp(s, t, p, l);
3318 }
3319 else if (proto == PPPCCP)
3320 {
3321 session[s].last_packet = time_now;
3322 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3323 processccp(s, t, p, l);
3324 }
3325 else if (proto == PPPIP)
3326 {
3327 if (session[s].die)
3328 {
3329 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3330 return; // closing session, PPP not processed
3331 }
3332
3333 session[s].last_packet = session[s].last_data = time_now;
3334 if (session[s].walled_garden && !config->cluster_iam_master)
3335 {
3336 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3337 return;
3338 }
3339
3340 processipin(s, t, p, l);
3341 }
3342 else if (proto == PPPMP)
3343 {
3344 if (session[s].die)
3345 {
3346 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3347 return; // closing session, PPP not processed
3348 }
3349
3350 session[s].last_packet = session[s].last_data = time_now;
3351 if (!config->cluster_iam_master)
3352 {
3353 // The fragments reconstruction is managed by the Master.
3354 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3355 return;
3356 }
3357
3358 processmpin(s, t, p, l);
3359 }
3360 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3361 {
3362 if (session[s].die)
3363 {
3364 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3365 return; // closing session, PPP not processed
3366 }
3367
3368 session[s].last_packet = session[s].last_data = time_now;
3369 if (session[s].walled_garden && !config->cluster_iam_master)
3370 {
3371 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3372 return;
3373 }
3374
3375 processipv6in(s, t, p, l);
3376 }
3377 else if (session[s].ppp.lcp == Opened)
3378 {
3379 session[s].last_packet = time_now;
3380 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3381 protoreject(s, t, p, l, proto);
3382 }
3383 else
3384 {
3385 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3386 proto, ppp_state(session[s].ppp.lcp));
3387 }
3388 }
3389 }
3390
3391 // read and process packet on tun
3392 // (i.e. this routine writes to buf[-8]).
3393 static void processtun(uint8_t * buf, int len)
3394 {
3395 LOG_HEX(5, "Receive TUN Data", buf, len);
3396 STAT(tun_rx_packets);
3397 INC_STAT(tun_rx_bytes, len);
3398
3399 CSTAT(processtun);
3400
3401 eth_rx_pkt++;
3402 eth_rx += len;
3403 if (len < 22)
3404 {
3405 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3406 STAT(tun_rx_errors);
3407 return;
3408 }
3409
3410 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3411 processipout(buf, len);
3412 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3413 && config->ipv6_prefix.s6_addr[0])
3414 processipv6out(buf, len);
3415
3416 // Else discard.
3417 }
3418
3419 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3420 // that we look at the whole of the tunnel, radius and session tables
3421 // every second
3422 static void regular_cleanups(double period)
3423 {
3424 // Next tunnel, radius and session to check for actions on.
3425 static tunnelidt t = 0;
3426 static int r = 0;
3427 static sessionidt s = 0;
3428
3429 int t_actions = 0;
3430 int r_actions = 0;
3431 int s_actions = 0;
3432
3433 int t_slice;
3434 int r_slice;
3435 int s_slice;
3436
3437 int i;
3438 int a;
3439
3440 // divide up tables into slices based on the last run
3441 t_slice = config->cluster_highest_tunnelid * period;
3442 r_slice = (MAXRADIUS - 1) * period;
3443 s_slice = config->cluster_highest_sessionid * period;
3444
3445 if (t_slice < 1)
3446 t_slice = 1;
3447 else if (t_slice > config->cluster_highest_tunnelid)
3448 t_slice = config->cluster_highest_tunnelid;
3449
3450 if (r_slice < 1)
3451 r_slice = 1;
3452 else if (r_slice > (MAXRADIUS - 1))
3453 r_slice = MAXRADIUS - 1;
3454
3455 if (s_slice < 1)
3456 s_slice = 1;
3457 else if (s_slice > config->cluster_highest_sessionid)
3458 s_slice = config->cluster_highest_sessionid;
3459
3460 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3461
3462 for (i = 0; i < t_slice; i++)
3463 {
3464 t++;
3465 if (t > config->cluster_highest_tunnelid)
3466 t = 1;
3467
3468 if (t == TUNNEL_ID_PPPOE)
3469 continue;
3470
3471 // check for expired tunnels
3472 if (tunnel[t].die && tunnel[t].die <= TIME)
3473 {
3474 STAT(tunnel_timeout);
3475 tunnelkill(t, "Expired");
3476 t_actions++;
3477 continue;
3478 }
3479 // check for message resend
3480 if (tunnel[t].retry && tunnel[t].controlc)
3481 {
3482 // resend pending messages as timeout on reply
3483 if (tunnel[t].retry <= TIME)
3484 {
3485 controlt *c = tunnel[t].controls;
3486 uint16_t w = tunnel[t].window;
3487 tunnel[t].try++; // another try
3488 if (tunnel[t].try > 5)
3489 tunnelkill(t, "Timeout on control message"); // game over
3490 else
3491 while (c && w--)
3492 {
3493 tunnelsend(c->buf, c->length, t);
3494 c = c->next;
3495 }
3496
3497 t_actions++;
3498 }
3499 }
3500 // Send hello
3501 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3502 {
3503 controlt *c = controlnew(6); // sending HELLO
3504 controladd(c, 0, t); // send the message
3505 LOG(3, 0, t, "Sending HELLO message\n");
3506 t_actions++;
3507 }
3508
3509 // Check for tunnel changes requested from the CLI
3510 if ((a = cli_tunnel_actions[t].action))
3511 {
3512 cli_tunnel_actions[t].action = 0;
3513 if (a & CLI_TUN_KILL)
3514 {
3515 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3516 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3517 t_actions++;
3518 }
3519 }
3520 }
3521
3522 for (i = 0; i < r_slice; i++)
3523 {
3524 r++;
3525 if (r >= MAXRADIUS)
3526 r = 1;
3527
3528 if (!radius[r].state)
3529 continue;
3530
3531 if (radius[r].retry <= TIME)
3532 {
3533 radiusretry(r);
3534 r_actions++;
3535 }
3536 }
3537
3538 for (i = 0; i < s_slice; i++)
3539 {
3540 s++;
3541 if (s > config->cluster_highest_sessionid)
3542 s = 1;
3543
3544 if (!session[s].opened) // Session isn't in use
3545 continue;
3546
3547 // check for expired sessions
3548 if (session[s].die)
3549 {
3550 if (session[s].die <= TIME)
3551 {
3552 sessionkill(s, "Expired");
3553 s_actions++;
3554 }
3555 continue;
3556 }
3557
3558 // PPP timeouts
3559 if (sess_local[s].lcp.restart <= time_now)
3560 {
3561 int next_state = session[s].ppp.lcp;
3562 switch (session[s].ppp.lcp)
3563 {
3564 case RequestSent:
3565 case AckReceived:
3566 next_state = RequestSent;
3567
3568 case AckSent:
3569 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3570 {
3571 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3572 sendlcp(s, session[s].tunnel);
3573 change_state(s, lcp, next_state);
3574 }
3575 else
3576 {
3577 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3578 STAT(session_timeout);
3579 }
3580
3581 s_actions++;
3582 }
3583
3584 if (session[s].die)
3585 continue;
3586 }
3587
3588 if (sess_local[s].ipcp.restart <= time_now)
3589 {
3590 int next_state = session[s].ppp.ipcp;
3591 switch (session[s].ppp.ipcp)
3592 {
3593 case RequestSent:
3594 case AckReceived:
3595 next_state = RequestSent;
3596
3597 case AckSent:
3598 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3599 {
3600 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3601 sendipcp(s, session[s].tunnel);
3602 change_state(s, ipcp, next_state);
3603 }
3604 else
3605 {
3606 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3607 STAT(session_timeout);
3608 }
3609
3610 s_actions++;
3611 }
3612
3613 if (session[s].die)
3614 continue;
3615 }
3616
3617 if (sess_local[s].ipv6cp.restart <= time_now)
3618 {
3619 int next_state = session[s].ppp.ipv6cp;
3620 switch (session[s].ppp.ipv6cp)
3621 {
3622 case RequestSent:
3623 case AckReceived:
3624 next_state = RequestSent;
3625
3626 case AckSent:
3627 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3628 {
3629 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3630 sendipv6cp(s, session[s].tunnel);
3631 change_state(s, ipv6cp, next_state);
3632 }
3633 else
3634 {
3635 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3636 change_state(s, ipv6cp, Stopped);
3637 }
3638
3639 s_actions++;
3640 }
3641 }
3642
3643 if (sess_local[s].ccp.restart <= time_now)
3644 {
3645 int next_state = session[s].ppp.ccp;
3646 switch (session[s].ppp.ccp)
3647 {
3648 case RequestSent:
3649 case AckReceived:
3650 next_state = RequestSent;
3651
3652 case AckSent:
3653 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3654 {
3655 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3656 sendccp(s, session[s].tunnel);
3657 change_state(s, ccp, next_state);
3658 }
3659 else
3660 {
3661 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3662 change_state(s, ccp, Stopped);
3663 }
3664
3665 s_actions++;
3666 }
3667 }
3668
3669 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3670 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3671 {
3672 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3673 STAT(session_timeout);
3674 s_actions++;
3675 continue;
3676 }
3677
3678 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3679 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3680 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3681 {
3682 uint8_t b[MAXETHER];
3683
3684 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3685 if (!q) continue;
3686
3687 *q = EchoReq;
3688 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3689 *(uint16_t *)(q + 2) = htons(8); // Length
3690 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3691
3692 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3693 (int)(time_now - session[s].last_packet));
3694
3695 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3696 sess_local[s].last_echo = time_now;
3697 s_actions++;
3698 }
3699
3700 // Drop sessions who have reached session_timeout seconds
3701 if (session[s].session_timeout)
3702 {
3703 bundleidt bid = session[s].bundle;
3704 if (bid)
3705 {
3706 if (time_now - bundle[bid].last_check >= 1)
3707 {
3708 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3709 bundle[bid].last_check = time_now;
3710 if (bundle[bid].online_time >= session[s].session_timeout)
3711 {
3712 int ses;
3713 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3714 {
3715 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3716 s_actions++;
3717 continue;
3718 }
3719 }
3720 }
3721 }
3722 else if (time_now - session[s].opened >= session[s].session_timeout)
3723 {
3724 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3725 s_actions++;
3726 continue;
3727 }
3728 }
3729
3730 // Drop sessions who have reached idle_timeout seconds
3731 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3732 {
3733 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3734 STAT(session_timeout);
3735 s_actions++;
3736 continue;
3737 }
3738
3739 // Check for actions requested from the CLI
3740 if ((a = cli_session_actions[s].action))
3741 {
3742 int send = 0;
3743
3744 cli_session_actions[s].action = 0;
3745 if (a & CLI_SESS_KILL)
3746 {
3747 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3748 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3749 a = 0; // dead, no need to check for other actions
3750 s_actions++;
3751 }
3752
3753 if (a & CLI_SESS_NOSNOOP)
3754 {
3755 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3756 session[s].snoop_ip = 0;
3757 session[s].snoop_port = 0;
3758 s_actions++;
3759 send++;
3760 }
3761 else if (a & CLI_SESS_SNOOP)
3762 {
3763 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3764 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3765 cli_session_actions[s].snoop_port);
3766
3767 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3768 session[s].snoop_port = cli_session_actions[s].snoop_port;
3769 s_actions++;
3770 send++;
3771 }
3772
3773 if (a & CLI_SESS_NOTHROTTLE)
3774 {
3775 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3776 throttle_session(s, 0, 0);
3777 s_actions++;
3778 send++;
3779 }
3780 else if (a & CLI_SESS_THROTTLE)
3781 {
3782 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3783 cli_session_actions[s].throttle_in,
3784 cli_session_actions[s].throttle_out);
3785
3786 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3787 s_actions++;
3788 send++;
3789 }
3790
3791 if (a & CLI_SESS_NOFILTER)
3792 {
3793 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3794 filter_session(s, 0, 0);
3795 s_actions++;
3796 send++;
3797 }
3798 else if (a & CLI_SESS_FILTER)
3799 {
3800 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3801 cli_session_actions[s].filter_in,
3802 cli_session_actions[s].filter_out);
3803
3804 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3805 s_actions++;
3806 send++;
3807 }
3808
3809 if (send)
3810 cluster_send_session(s);
3811 }
3812
3813 // RADIUS interim accounting
3814 if (config->radius_accounting && config->radius_interim > 0
3815 && session[s].ip && !session[s].walled_garden
3816 && !sess_local[s].radius // RADIUS already in progress
3817 && time_now - sess_local[s].last_interim >= config->radius_interim
3818 && session[s].flags & SESSION_STARTED)
3819 {
3820 int rad = radiusnew(s);
3821 if (!rad)
3822 {
3823 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3824 STAT(radius_overflow);
3825 continue;
3826 }
3827
3828 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3829 session[s].user, session[s].unique_id);
3830
3831 radiussend(rad, RADIUSINTERIM);
3832 sess_local[s].last_interim = time_now;
3833 s_actions++;
3834 }
3835 }
3836
3837 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3838 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3839 }
3840
3841 //
3842 // Are we in the middle of a tunnel update, or radius
3843 // requests??
3844 //
3845 static int still_busy(void)
3846 {
3847 int i;
3848 static clockt last_talked = 0;
3849 static clockt start_busy_wait = 0;
3850
3851 #ifdef BGP
3852 static time_t stopped_bgp = 0;
3853 if (bgp_configured)
3854 {
3855 if (!stopped_bgp)
3856 {
3857 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3858
3859 for (i = 0; i < BGP_NUM_PEERS; i++)
3860 if (bgp_peers[i].state == Established)
3861 bgp_stop(&bgp_peers[i]);
3862
3863 stopped_bgp = time_now;
3864
3865 if (!config->cluster_iam_master)
3866 {
3867 // we don't want to become master
3868 cluster_send_ping(0);
3869
3870 return 1;
3871 }
3872 }
3873
3874 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3875 return 1;
3876 }
3877 #endif /* BGP */
3878
3879 if (!config->cluster_iam_master)
3880 return 0;
3881
3882 if (main_quit == QUIT_SHUTDOWN)
3883 {
3884 static int dropped = 0;
3885 if (!dropped)
3886 {
3887 int i;
3888
3889 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3890 for (i = 1; i < MAXTUNNEL; i++)
3891 if (tunnel[i].ip || tunnel[i].state)
3892 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3893
3894 dropped = 1;
3895 }
3896 }
3897
3898 if (start_busy_wait == 0)
3899 start_busy_wait = TIME;
3900
3901 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3902 {
3903 if (!tunnel[i].controlc)
3904 continue;
3905
3906 if (last_talked != TIME)
3907 {
3908 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3909 last_talked = TIME;
3910 }
3911 return 1;
3912 }
3913
3914 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3915 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3916 {
3917 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3918 return 0;
3919 }
3920
3921 for (i = 1; i < MAXRADIUS; i++)
3922 {
3923 if (radius[i].state == RADIUSNULL)
3924 continue;
3925 if (radius[i].state == RADIUSWAIT)
3926 continue;
3927
3928 if (last_talked != TIME)
3929 {
3930 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3931 last_talked = TIME;
3932 }
3933 return 1;
3934 }
3935
3936 return 0;
3937 }
3938
3939 #ifdef HAVE_EPOLL
3940 # include <sys/epoll.h>
3941 #else
3942 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3943 # include "fake_epoll.h"
3944 #endif
3945
3946 #ifdef LAC
3947 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac, pppoedisc, pppoesess
3948 #define BASE_FDS 10
3949 #else
3950 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, pppoedisc, pppoesess
3951 #define BASE_FDS 9
3952 #endif
3953
3954 // additional polled fds
3955 #ifdef BGP
3956 # define EXTRA_FDS BGP_NUM_PEERS
3957 #else
3958 # define EXTRA_FDS 0
3959 #endif
3960
3961 // main loop - gets packets on tun or udp and processes them
3962 static void mainloop(void)
3963 {
3964 int i;
3965 uint8_t buf[65536];
3966 uint8_t *p = buf + 24; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3967 // and the forwarded pppoe session
3968 int size_bufp = sizeof(buf) - 24;
3969 clockt next_cluster_ping = 0; // send initial ping immediately
3970 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3971 int maxevent = sizeof(events)/sizeof(*events);
3972
3973 if ((epollfd = epoll_create(maxevent)) < 0)
3974 {
3975 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3976 exit(1);
3977 }
3978
3979 #ifdef LAC
3980 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",
3981 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
3982 #else
3983 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",
3984 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, pppoediscfd, pppoesessfd);
3985 #endif
3986
3987 /* setup our fds to poll for input */
3988 {
3989 static struct event_data d[BASE_FDS];
3990 struct epoll_event e;
3991
3992 e.events = EPOLLIN;
3993 i = 0;
3994
3995 if (clifd >= 0)
3996 {
3997 d[i].type = FD_TYPE_CLI;
3998 e.data.ptr = &d[i++];
3999 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4000 }
4001
4002 d[i].type = FD_TYPE_CLUSTER;
4003 e.data.ptr = &d[i++];
4004 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4005
4006 d[i].type = FD_TYPE_TUN;
4007 e.data.ptr = &d[i++];
4008 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4009
4010 d[i].type = FD_TYPE_UDP;
4011 e.data.ptr = &d[i++];
4012 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
4013
4014 d[i].type = FD_TYPE_CONTROL;
4015 e.data.ptr = &d[i++];
4016 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4017
4018 d[i].type = FD_TYPE_DAE;
4019 e.data.ptr = &d[i++];
4020 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4021
4022 d[i].type = FD_TYPE_NETLINK;
4023 e.data.ptr = &d[i++];
4024 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4025
4026 #ifdef LAC
4027 d[i].type = FD_TYPE_UDPLAC;
4028 e.data.ptr = &d[i++];
4029 epoll_ctl(epollfd, EPOLL_CTL_ADD, udplacfd, &e);
4030 #endif
4031
4032 d[i].type = FD_TYPE_PPPOEDISC;
4033 e.data.ptr = &d[i++];
4034 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4035
4036 d[i].type = FD_TYPE_PPPOESESS;
4037 e.data.ptr = &d[i++];
4038 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4039 }
4040
4041 #ifdef BGP
4042 signal(SIGPIPE, SIG_IGN);
4043 bgp_setup(config->as_number);
4044 if (config->bind_address)
4045 bgp_add_route(config->bind_address, 0xffffffff);
4046
4047 for (i = 0; i < BGP_NUM_PEERS; i++)
4048 {
4049 if (config->neighbour[i].name[0])
4050 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4051 config->neighbour[i].as, config->neighbour[i].keepalive,
4052 config->neighbour[i].hold, config->neighbour[i].update_source,
4053 0); /* 0 = routing disabled */
4054 }
4055 #endif /* BGP */
4056
4057 while (!main_quit || still_busy())
4058 {
4059 int more = 0;
4060 int n;
4061
4062
4063 if (main_reload)
4064 {
4065 main_reload = 0;
4066 read_config_file();
4067 config->reload_config++;
4068 }
4069
4070 if (config->reload_config)
4071 {
4072 config->reload_config = 0;
4073 update_config();
4074 }
4075
4076 #ifdef BGP
4077 bgp_set_poll();
4078 #endif /* BGP */
4079
4080 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4081 STAT(select_called);
4082
4083 TIME = now(NULL);
4084 if (n < 0)
4085 {
4086 if (errno == EINTR ||
4087 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4088 continue;
4089
4090 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4091 break; // exit
4092 }
4093
4094 if (n)
4095 {
4096 struct sockaddr_in addr;
4097 struct in_addr local;
4098 socklen_t alen;
4099 int c, s;
4100 int udp_ready = 0;
4101 #ifdef LAC
4102 int udplac_ready = 0;
4103 int udplac_pkts = 0;
4104 #endif
4105 int pppoesess_ready = 0;
4106 int pppoesess_pkts = 0;
4107 int tun_ready = 0;
4108 int cluster_ready = 0;
4109 int udp_pkts = 0;
4110 int tun_pkts = 0;
4111 int cluster_pkts = 0;
4112 #ifdef BGP
4113 uint32_t bgp_events[BGP_NUM_PEERS];
4114 memset(bgp_events, 0, sizeof(bgp_events));
4115 #endif /* BGP */
4116
4117 for (c = n, i = 0; i < c; i++)
4118 {
4119 struct event_data *d = events[i].data.ptr;
4120
4121 switch (d->type)
4122 {
4123 case FD_TYPE_CLI: // CLI connections
4124 {
4125 int cli;
4126
4127 alen = sizeof(addr);
4128 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4129 {
4130 cli_do(cli);
4131 close(cli);
4132 }
4133 else
4134 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4135
4136 n--;
4137 break;
4138 }
4139
4140 // these are handled below, with multiple interleaved reads
4141 case FD_TYPE_CLUSTER: cluster_ready++; break;
4142 case FD_TYPE_TUN: tun_ready++; break;
4143 case FD_TYPE_UDP: udp_ready++; break;
4144 #ifdef LAC
4145 case FD_TYPE_UDPLAC: udplac_ready++; break;
4146 #endif
4147 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4148
4149 case FD_TYPE_PPPOEDISC: // pppoe discovery
4150 s = read(pppoediscfd, p, size_bufp);
4151 if (s > 0) process_pppoe_disc(p, s);
4152 n--;
4153 break;
4154
4155 case FD_TYPE_CONTROL: // nsctl commands
4156 alen = sizeof(addr);
4157 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4158 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
4159 n--;
4160 break;
4161
4162 case FD_TYPE_DAE: // DAE requests
4163 alen = sizeof(addr);
4164 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4165 if (s > 0) processdae(buf, s, &addr, alen, &local);
4166 n--;
4167 break;
4168
4169 case FD_TYPE_RADIUS: // RADIUS response
4170 alen = sizeof(addr);
4171 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4172 if (s >= 0 && config->cluster_iam_master)
4173 {
4174 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4175 addr.sin_addr.s_addr == config->radiusserver[1])
4176 processrad(buf, s, d->index);
4177 else
4178 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4179 fmtaddr(addr.sin_addr.s_addr, 0));
4180 }
4181
4182 n--;
4183 break;
4184
4185 #ifdef BGP
4186 case FD_TYPE_BGP:
4187 bgp_events[d->index] = events[i].events;
4188 n--;
4189 break;
4190 #endif /* BGP */
4191
4192 case FD_TYPE_NETLINK:
4193 {
4194 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
4195 s = netlink_recv(buf, sizeof(buf));
4196 if (nh->nlmsg_type == NLMSG_ERROR)
4197 {
4198 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4199 if (errmsg->error)
4200 {
4201 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4202 {
4203 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4204 exit(1);
4205 }
4206 else
4207
4208 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4209 }
4210 // else it's a ack
4211 }
4212 else
4213 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);
4214 n--;
4215 break;
4216 }
4217
4218 default:
4219 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4220 }
4221 }
4222
4223 #ifdef BGP
4224 bgp_process(bgp_events);
4225 #endif /* BGP */
4226
4227 for (c = 0; n && c < config->multi_read_count; c++)
4228 {
4229 // L2TP
4230 if (udp_ready)
4231 {
4232 alen = sizeof(addr);
4233 if ((s = recvfrom(udpfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4234 {
4235 processudp(p, s, &addr);
4236 udp_pkts++;
4237 }
4238 else
4239 {
4240 udp_ready = 0;
4241 n--;
4242 }
4243 }
4244 #ifdef LAC
4245 // L2TP REMOTE LNS
4246 if (udplac_ready)
4247 {
4248 alen = sizeof(addr);
4249 if ((s = recvfrom(udplacfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4250 {
4251 if (!config->disable_lac_func)
4252 processudp(p, s, &addr);
4253
4254 udplac_pkts++;
4255 }
4256 else
4257 {
4258 udplac_ready = 0;
4259 n--;
4260 }
4261 }
4262 #endif
4263 // incoming IP
4264 if (tun_ready)
4265 {
4266 if ((s = read(tunfd, p, size_bufp)) > 0)
4267 {
4268 processtun(p, s);
4269 tun_pkts++;
4270 }
4271 else
4272 {
4273 tun_ready = 0;
4274 n--;
4275 }
4276 }
4277
4278 // pppoe session
4279 if (pppoesess_ready)
4280 {
4281 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4282 {
4283 process_pppoe_sess(p, s);
4284 pppoesess_pkts++;
4285 }
4286 else
4287 {
4288 pppoesess_ready = 0;
4289 n--;
4290 }
4291 }
4292
4293 // cluster
4294 if (cluster_ready)
4295 {
4296 alen = sizeof(addr);
4297 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4298 {
4299 processcluster(p, s, addr.sin_addr.s_addr);
4300 cluster_pkts++;
4301 }
4302 else
4303 {
4304 cluster_ready = 0;
4305 n--;
4306 }
4307 }
4308 }
4309
4310 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
4311 STAT(multi_read_used);
4312
4313 if (c >= config->multi_read_count)
4314 {
4315 #ifdef LAC
4316 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d rmlns packets\n",
4317 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, udplac_pkts);
4318 #else
4319 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
4320 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
4321 #endif
4322 STAT(multi_read_exceeded);
4323 more++;
4324 }
4325 }
4326 #ifdef BGP
4327 else
4328 /* no event received, but timers could still have expired */
4329 bgp_process_peers_timers();
4330 #endif /* BGP */
4331
4332 if (time_changed)
4333 {
4334 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4335
4336 // Log current traffic stats
4337 snprintf(config->bandwidth, sizeof(config->bandwidth),
4338 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4339 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4340 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4341 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4342
4343 udp_tx = udp_rx = 0;
4344 udp_rx_pkt = eth_rx_pkt = 0;
4345 eth_tx = eth_rx = 0;
4346 time_changed = 0;
4347
4348 if (config->dump_speed)
4349 printf("%s\n", config->bandwidth);
4350
4351 // Update the internal time counter
4352 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4353
4354 {
4355 // Run timer hooks
4356 struct param_timer p = { time_now };
4357 run_plugins(PLUGIN_TIMER, &p);
4358 }
4359 }
4360
4361 // Runs on every machine (master and slaves).
4362 if (next_cluster_ping <= TIME)
4363 {
4364 // Check to see which of the cluster is still alive..
4365
4366 cluster_send_ping(basetime); // Only does anything if we're a slave
4367 cluster_check_master(); // ditto.
4368
4369 cluster_heartbeat(); // Only does anything if we're a master.
4370 cluster_check_slaves(); // ditto.
4371
4372 master_update_counts(); // If we're a slave, send our byte counters to our master.
4373
4374 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4375 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4376 else
4377 next_cluster_ping = TIME + config->cluster_hb_interval;
4378 }
4379
4380 if (!config->cluster_iam_master)
4381 continue;
4382
4383 // Run token bucket filtering queue..
4384 // Only run it every 1/10th of a second.
4385 {
4386 static clockt last_run = 0;
4387 if (last_run != TIME)
4388 {
4389 last_run = TIME;
4390 tbf_run_timer();
4391 }
4392 }
4393
4394 // Handle timeouts, retries etc.
4395 {
4396 static double last_clean = 0;
4397 double this_clean;
4398 double diff;
4399
4400 TIME = now(&this_clean);
4401 diff = this_clean - last_clean;
4402
4403 // Run during idle time (after we've handled
4404 // all incoming packets) or every 1/10th sec
4405 if (!more || diff > 0.1)
4406 {
4407 regular_cleanups(diff);
4408 last_clean = this_clean;
4409 }
4410 }
4411
4412 if (*config->accounting_dir)
4413 {
4414 static clockt next_acct = 0;
4415 static clockt next_shut_acct = 0;
4416
4417 if (next_acct <= TIME)
4418 {
4419 // Dump accounting data
4420 next_acct = TIME + ACCT_TIME;
4421 next_shut_acct = TIME + ACCT_SHUT_TIME;
4422 dump_acct_info(1);
4423 }
4424 else if (next_shut_acct <= TIME)
4425 {
4426 // Dump accounting data for shutdown sessions
4427 next_shut_acct = TIME + ACCT_SHUT_TIME;
4428 if (shut_acct_n)
4429 dump_acct_info(0);
4430 }
4431 }
4432 }
4433
4434 // Are we the master and shutting down??
4435 if (config->cluster_iam_master)
4436 cluster_heartbeat(); // Flush any queued changes..
4437
4438 // Ok. Notify everyone we're shutting down. If we're
4439 // the master, this will force an election.
4440 cluster_send_ping(0);
4441
4442 //
4443 // Important!!! We MUST not process any packets past this point!
4444 LOG(1, 0, 0, "Shutdown complete\n");
4445 }
4446
4447 static void stripdomain(char *host)
4448 {
4449 char *p;
4450
4451 if ((p = strchr(host, '.')))
4452 {
4453 char *domain = 0;
4454 char _domain[1024];
4455
4456 // strip off domain
4457 FILE *resolv = fopen("/etc/resolv.conf", "r");
4458 if (resolv)
4459 {
4460 char buf[1024];
4461 char *b;
4462
4463 while (fgets(buf, sizeof(buf), resolv))
4464 {
4465 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4466 continue;
4467
4468 if (!isspace(buf[6]))
4469 continue;
4470
4471 b = buf + 7;
4472 while (isspace(*b)) b++;
4473
4474 if (*b)
4475 {
4476 char *d = b;
4477 while (*b && !isspace(*b)) b++;
4478 *b = 0;
4479 if (buf[0] == 'd') // domain is canonical
4480 {
4481 domain = d;
4482 break;
4483 }
4484
4485 // first search line
4486 if (!domain)
4487 {
4488 // hold, may be subsequent domain line
4489 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4490 domain = _domain;
4491 }
4492 }
4493 }
4494
4495 fclose(resolv);
4496 }
4497
4498 if (domain)
4499 {
4500 int hl = strlen(host);
4501 int dl = strlen(domain);
4502 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4503 host[hl -dl - 1] = 0;
4504 }
4505 else
4506 {
4507 *p = 0; // everything after first dot
4508 }
4509 }
4510 }
4511
4512 // Init data structures
4513 static void initdata(int optdebug, char *optconfig)
4514 {
4515 int i;
4516
4517 if (!(config = shared_malloc(sizeof(configt))))
4518 {
4519 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4520 exit(1);
4521 }
4522
4523 memset(config, 0, sizeof(configt));
4524 time(&config->start_time);
4525 strncpy(config->config_file, optconfig, strlen(optconfig));
4526 config->debug = optdebug;
4527 config->num_tbfs = MAXTBFS;
4528 config->rl_rate = 28; // 28kbps
4529 config->cluster_mcast_ttl = 1;
4530 config->cluster_master_min_adv = 1;
4531 config->ppp_restart_time = 3;
4532 config->ppp_max_configure = 10;
4533 config->ppp_max_failure = 5;
4534 config->kill_timedout_sessions = 1;
4535 strcpy(config->random_device, RANDOMDEVICE);
4536 // Set default value echo_timeout and idle_echo_timeout
4537 config->echo_timeout = ECHO_TIMEOUT;
4538 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4539
4540 log_stream = stderr;
4541
4542 #ifdef RINGBUFFER
4543 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4544 {
4545 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4546 exit(1);
4547 }
4548 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4549 #endif
4550
4551 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4552 {
4553 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4554 exit(1);
4555 }
4556 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4557 {
4558 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4559 exit(1);
4560 }
4561 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4562 {
4563 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4564 exit(1);
4565 }
4566 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4567 {
4568 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4569 exit(1);
4570 }
4571 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4572 {
4573 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4574 exit(1);
4575 }
4576
4577 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4578 {
4579 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4580 exit(1);
4581 }
4582
4583 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4584 {
4585 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4586 exit(1);
4587 }
4588
4589 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4590 {
4591 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4592 exit(1);
4593 }
4594
4595 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4596 {
4597 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4598 exit(1);
4599 }
4600 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4601
4602 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4603 {
4604 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4605 exit(1);
4606 }
4607 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4608
4609 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4610 {
4611 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4612 exit(1);
4613 }
4614 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4615
4616 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4617 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4618 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4619 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4620 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4621
4622 // Put all the sessions on the free list marked as undefined.
4623 for (i = 1; i < MAXSESSION; i++)
4624 {
4625 session[i].next = i + 1;
4626 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4627 }
4628 session[MAXSESSION - 1].next = 0;
4629 sessionfree = 1;
4630
4631 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4632 for (i = 1; i < MAXTUNNEL; i++)
4633 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4634
4635 for (i = 1; i < MAXBUNDLE; i++) {
4636 bundle[i].state = BUNDLEUNDEF;
4637 }
4638
4639 if (!*hostname)
4640 {
4641 // Grab my hostname unless it's been specified
4642 gethostname(hostname, sizeof(hostname));
4643 stripdomain(hostname);
4644 }
4645
4646 _statistics->start_time = _statistics->last_reset = time(NULL);
4647
4648 #ifdef BGP
4649 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4650 {
4651 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4652 exit(1);
4653 }
4654 #endif /* BGP */
4655
4656 #ifdef LAC
4657 lac_initremotelnsdata();
4658 #endif
4659 }
4660
4661 static int assign_ip_address(sessionidt s)
4662 {
4663 uint32_t i;
4664 int best = -1;
4665 time_t best_time = time_now;
4666 char *u = session[s].user;
4667 char reuse = 0;
4668
4669
4670 CSTAT(assign_ip_address);
4671
4672 for (i = 1; i < ip_pool_size; i++)
4673 {
4674 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4675 continue;
4676
4677 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4678 {
4679 best = i;
4680 reuse = 1;
4681 break;
4682 }
4683
4684 if (ip_address_pool[i].last < best_time)
4685 {
4686 best = i;
4687 if (!(best_time = ip_address_pool[i].last))
4688 break; // never used, grab this one
4689 }
4690 }
4691
4692 if (best < 0)
4693 {
4694 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4695 return 0;
4696 }
4697
4698 session[s].ip = ip_address_pool[best].address;
4699 session[s].ip_pool_index = best;
4700 ip_address_pool[best].assigned = 1;
4701 ip_address_pool[best].last = time_now;
4702 ip_address_pool[best].session = s;
4703 if (session[s].walled_garden)
4704 /* Don't track addresses of users in walled garden (note: this
4705 means that their address isn't "sticky" even if they get
4706 un-gardened). */
4707 ip_address_pool[best].user[0] = 0;
4708 else
4709 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4710
4711 STAT(ip_allocated);
4712 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4713 reuse ? "Reusing" : "Allocating", best);
4714
4715 return 1;
4716 }
4717
4718 static void free_ip_address(sessionidt s)
4719 {
4720 int i = session[s].ip_pool_index;
4721
4722
4723 CSTAT(free_ip_address);
4724
4725 if (!session[s].ip)
4726 return; // what the?
4727
4728 if (i < 0) // Is this actually part of the ip pool?
4729 i = 0;
4730
4731 STAT(ip_freed);
4732 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4733 session[s].ip = 0;
4734 ip_address_pool[i].assigned = 0;
4735 ip_address_pool[i].session = 0;
4736 ip_address_pool[i].last = time_now;
4737 }
4738
4739 //
4740 // Fsck the address pool against the session table.
4741 // Normally only called when we become a master.
4742 //
4743 // This isn't perfect: We aren't keep tracking of which
4744 // users used to have an IP address.
4745 //
4746 void rebuild_address_pool(void)
4747 {
4748 int i;
4749
4750 //
4751 // Zero the IP pool allocation, and build
4752 // a map from IP address to pool index.
4753 for (i = 1; i < MAXIPPOOL; ++i)
4754 {
4755 ip_address_pool[i].assigned = 0;
4756 ip_address_pool[i].session = 0;
4757 if (!ip_address_pool[i].address)
4758 continue;
4759
4760 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4761 }
4762
4763 for (i = 0; i < MAXSESSION; ++i)
4764 {
4765 int ipid;
4766 if (!(session[i].opened && session[i].ip))
4767 continue;
4768
4769 ipid = - lookup_ipmap(htonl(session[i].ip));
4770
4771 if (session[i].ip_pool_index < 0)
4772 {
4773 // Not allocated out of the pool.
4774 if (ipid < 1) // Not found in the pool either? good.
4775 continue;
4776
4777 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4778 i, fmtaddr(session[i].ip, 0), ipid);
4779
4780 // Fall through and process it as part of the pool.
4781 }
4782
4783
4784 if (ipid > MAXIPPOOL || ipid < 0)
4785 {
4786 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4787 ipid = -1;
4788 session[i].ip_pool_index = ipid;
4789 continue;
4790 }
4791
4792 ip_address_pool[ipid].assigned = 1;
4793 ip_address_pool[ipid].session = i;
4794 ip_address_pool[ipid].last = time_now;
4795 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4796 session[i].ip_pool_index = ipid;
4797 cache_ipmap(session[i].ip, i); // Fix the ip map.
4798 }
4799 }
4800
4801 //
4802 // Fix the address pool to match a changed session.
4803 // (usually when the master sends us an update).
4804 static void fix_address_pool(int sid)
4805 {
4806 int ipid;
4807
4808 ipid = session[sid].ip_pool_index;
4809
4810 if (ipid > ip_pool_size)
4811 return; // Ignore it. rebuild_address_pool will fix it up.
4812
4813 if (ip_address_pool[ipid].address != session[sid].ip)
4814 return; // Just ignore it. rebuild_address_pool will take care of it.
4815
4816 ip_address_pool[ipid].assigned = 1;
4817 ip_address_pool[ipid].session = sid;
4818 ip_address_pool[ipid].last = time_now;
4819 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4820 }
4821
4822 //
4823 // Add a block of addresses to the IP pool to hand out.
4824 //
4825 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4826 {
4827 int i;
4828 if (prefixlen == 0)
4829 prefixlen = 32; // Host route only.
4830
4831 addr &= 0xffffffff << (32 - prefixlen);
4832
4833 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4834 return ;
4835
4836 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4837 {
4838 if ((i & 0xff) == 0 || (i&0xff) == 255)
4839 continue; // Skip 0 and broadcast addresses.
4840
4841 ip_address_pool[ip_pool_size].address = i;
4842 ip_address_pool[ip_pool_size].assigned = 0;
4843 ++ip_pool_size;
4844 if (ip_pool_size >= MAXIPPOOL)
4845 {
4846 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4847 return;
4848 }
4849 }
4850 }
4851
4852 // Initialize the IP address pool
4853 static void initippool()
4854 {
4855 FILE *f;
4856 char *p;
4857 char buf[4096];
4858 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4859
4860 if (!(f = fopen(IPPOOLFILE, "r")))
4861 {
4862 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4863 exit(1);
4864 }
4865
4866 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4867 {
4868 char *pool = buf;
4869 buf[4095] = 0; // Force it to be zero terminated/
4870
4871 if (*buf == '#' || *buf == '\n')
4872 continue; // Skip comments / blank lines
4873 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4874 if ((p = (char *)strchr(buf, ':')))
4875 {
4876 in_addr_t src;
4877 *p = '\0';
4878 src = inet_addr(buf);
4879 if (src == INADDR_NONE)
4880 {
4881 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4882 exit(1);
4883 }
4884 // This entry is for a specific IP only
4885 if (src != config->bind_address)
4886 continue;
4887 *p = ':';
4888 pool = p+1;
4889 }
4890 if ((p = (char *)strchr(pool, '/')))
4891 {
4892 // It's a range
4893 int numbits = 0;
4894 in_addr_t start = 0;
4895
4896 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4897 *p++ = 0;
4898 if (!*p || !(numbits = atoi(p)))
4899 {
4900 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4901 continue;
4902 }
4903 start = ntohl(inet_addr(pool));
4904
4905 // Add a static route for this pool
4906 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4907 fmtaddr(htonl(start), 0), numbits);
4908
4909 routeset(0, start, numbits, 0, 1);
4910
4911 add_to_ip_pool(start, numbits);
4912 }
4913 else
4914 {
4915 // It's a single ip address
4916 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4917 }
4918 }
4919 fclose(f);
4920 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4921 }
4922
4923 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4924 {
4925 struct sockaddr_in snoop_addr = {0};
4926 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4927 return;
4928
4929 snoop_addr.sin_family = AF_INET;
4930 snoop_addr.sin_addr.s_addr = destination;
4931 snoop_addr.sin_port = ntohs(port);
4932
4933 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4934 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4935 htons(snoop_addr.sin_port));
4936
4937 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4938 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4939
4940 STAT(packets_snooped);
4941 }
4942
4943 static int dump_session(FILE **f, sessiont *s)
4944 {
4945 #ifdef LAC
4946 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4947 #else
4948 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4949 #endif
4950 return 1;
4951
4952 if (!*f)
4953 {
4954 char filename[1024];
4955 char timestr[64];
4956 time_t now = time(NULL);
4957
4958 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4959 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4960
4961 if (!(*f = fopen(filename, "w")))
4962 {
4963 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4964 return 0;
4965 }
4966
4967 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4968 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4969 "# host: %s\n"
4970 "# endpoint: %s\n"
4971 "# time: %ld\n"
4972 "# uptime: %ld\n"
4973 "# format: username ip qos uptxoctets downrxoctets\n",
4974 hostname,
4975 fmtaddr(config->iftun_address ? config->iftun_address : my_address, 0),
4976 now,
4977 now - basetime);
4978 }
4979
4980 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4981 fprintf(*f, "%s %s %d %u %u\n",
4982 s->user, // username
4983 fmtaddr(htonl(s->ip), 0), // ip
4984 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4985 (uint32_t) s->cin_delta, // uptxoctets
4986 (uint32_t) s->cout_delta); // downrxoctets
4987
4988 s->cin_delta = s->cout_delta = 0;
4989
4990 return 1;
4991 }
4992
4993 static void dump_acct_info(int all)
4994 {
4995 int i;
4996 FILE *f = NULL;
4997
4998
4999 CSTAT(dump_acct_info);
5000
5001 if (shut_acct_n)
5002 {
5003 for (i = 0; i < shut_acct_n; i++)
5004 dump_session(&f, &shut_acct[i]);
5005
5006 shut_acct_n = 0;
5007 }
5008
5009 if (all)
5010 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5011 dump_session(&f, &session[i]);
5012
5013 if (f)
5014 fclose(f);
5015 }
5016
5017 // Main program
5018 int main(int argc, char *argv[])
5019 {
5020 int i;
5021 int optdebug = 0;
5022 char *optconfig = CONFIGFILE;
5023
5024 time(&basetime); // start clock
5025
5026 // scan args
5027 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5028 {
5029 switch (i)
5030 {
5031 case 'd':
5032 if (fork()) exit(0);
5033 setsid();
5034 freopen("/dev/null", "r", stdin);
5035 freopen("/dev/null", "w", stdout);
5036 freopen("/dev/null", "w", stderr);
5037 break;
5038 case 'v':
5039 optdebug++;
5040 break;
5041 case 'c':
5042 optconfig = optarg;
5043 break;
5044 case 'h':
5045 snprintf(hostname, sizeof(hostname), "%s", optarg);
5046 break;
5047 default:
5048 printf("Args are:\n"
5049 "\t-d\t\tDetach from terminal\n"
5050 "\t-c <file>\tConfig file\n"
5051 "\t-h <hostname>\tForce hostname\n"
5052 "\t-v\t\tDebug\n");
5053
5054 return (0);
5055 break;
5056 }
5057 }
5058
5059 // Start the timer routine off
5060 time(&time_now);
5061 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5062
5063 initplugins();
5064 initdata(optdebug, optconfig);
5065
5066 init_cli();
5067 read_config_file();
5068 /* set hostname /after/ having read the config file */
5069 if (*config->hostname)
5070 strcpy(hostname, config->hostname);
5071 cli_init_complete(hostname);
5072 update_config();
5073 init_tbf(config->num_tbfs);
5074
5075 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5076 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5077 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5078 {
5079 struct rlimit rlim;
5080 rlim.rlim_cur = RLIM_INFINITY;
5081 rlim.rlim_max = RLIM_INFINITY;
5082 // Remove the maximum core size
5083 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5084 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5085
5086 // Make core dumps go to /tmp
5087 chdir("/tmp");
5088 }
5089
5090 if (config->scheduler_fifo)
5091 {
5092 int ret;
5093 struct sched_param params = {0};
5094 params.sched_priority = 1;
5095
5096 if (get_nprocs() < 2)
5097 {
5098 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5099 config->scheduler_fifo = 0;
5100 }
5101 else
5102 {
5103 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5104 {
5105 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5106 }
5107 else
5108 {
5109 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5110 config->scheduler_fifo = 0;
5111 }
5112 }
5113 }
5114
5115 initnetlink();
5116
5117 /* Set up the cluster communications port. */
5118 if (cluster_init() < 0)
5119 exit(1);
5120
5121 inittun();
5122 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5123
5124 if (*config->pppoe_if_name)
5125 {
5126 init_pppoe();
5127 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_name);
5128 }
5129 initudp();
5130 initrad();
5131 initippool();
5132
5133 // seed prng
5134 {
5135 unsigned seed = time_now ^ getpid();
5136 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5137 srand(seed);
5138 }
5139
5140 signal(SIGHUP, sighup_handler);
5141 signal(SIGCHLD, sigchild_handler);
5142 signal(SIGTERM, shutdown_handler);
5143 signal(SIGINT, shutdown_handler);
5144 signal(SIGQUIT, shutdown_handler);
5145
5146 // Prevent us from getting paged out
5147 if (config->lock_pages)
5148 {
5149 if (!mlockall(MCL_CURRENT))
5150 LOG(1, 0, 0, "Locking pages into memory\n");
5151 else
5152 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5153 }
5154
5155 mainloop();
5156
5157 /* remove plugins (so cleanup code gets run) */
5158 plugins_done();
5159
5160 // Remove the PID file if we wrote it
5161 if (config->wrote_pid && *config->pid_file == '/')
5162 unlink(config->pid_file);
5163
5164 /* kill CLI children */
5165 signal(SIGTERM, SIG_IGN);
5166 kill(0, SIGTERM);
5167 return 0;
5168 }
5169
5170 static void sighup_handler(int sig)
5171 {
5172 main_reload++;
5173 }
5174
5175 static void shutdown_handler(int sig)
5176 {
5177 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5178 }
5179
5180 static void sigchild_handler(int sig)
5181 {
5182 while (waitpid(-1, NULL, WNOHANG) > 0)
5183 ;
5184 }
5185
5186 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5187 {
5188 MD5_CTX ctx;
5189 *challenge_response = NULL;
5190
5191 if (!*config->l2tp_secret)
5192 {
5193 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5194 return;
5195 }
5196
5197 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5198
5199 *challenge_response = calloc(17, 1);
5200
5201 MD5_Init(&ctx);
5202 MD5_Update(&ctx, &id, 1);
5203 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5204 MD5_Update(&ctx, challenge, challenge_length);
5205 MD5_Final(*challenge_response, &ctx);
5206
5207 return;
5208 }
5209
5210 static int facility_value(char *name)
5211 {
5212 int i;
5213 for (i = 0; facilitynames[i].c_name; i++)
5214 {
5215 if (strcmp(facilitynames[i].c_name, name) == 0)
5216 return facilitynames[i].c_val;
5217 }
5218 return 0;
5219 }
5220
5221 static void update_config()
5222 {
5223 int i;
5224 char *p;
5225 static int timeout = 0;
5226 static int interval = 0;
5227
5228 // Update logging
5229 closelog();
5230 syslog_log = 0;
5231 if (log_stream)
5232 {
5233 if (log_stream != stderr)
5234 fclose(log_stream);
5235
5236 log_stream = NULL;
5237 }
5238
5239 if (*config->log_filename)
5240 {
5241 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5242 {
5243 char *p = config->log_filename + 7;
5244 if (*p)
5245 {
5246 openlog("l2tpns", LOG_PID, facility_value(p));
5247 syslog_log = 1;
5248 }
5249 }
5250 else if (strchr(config->log_filename, '/') == config->log_filename)
5251 {
5252 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5253 {
5254 fseek(log_stream, 0, SEEK_END);
5255 setbuf(log_stream, NULL);
5256 }
5257 else
5258 {
5259 log_stream = stderr;
5260 setbuf(log_stream, NULL);
5261 }
5262 }
5263 }
5264 else
5265 {
5266 log_stream = stderr;
5267 setbuf(log_stream, NULL);
5268 }
5269
5270 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5271 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5272
5273 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5274 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5275 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5276
5277 // reset MRU/MSS globals
5278 MRU = config->l2tp_mtu - L2TP_HDRS;
5279 if (MRU > PPPoE_MRU)
5280 MRU = PPPoE_MRU;
5281
5282 MSS = MRU - TCP_HDRS;
5283
5284 // Update radius
5285 config->numradiusservers = 0;
5286 for (i = 0; i < MAXRADSERVER; i++)
5287 if (config->radiusserver[i])
5288 {
5289 config->numradiusservers++;
5290 // Set radius port: if not set, take the port from the
5291 // first radius server. For the first radius server,
5292 // take the #defined default value from l2tpns.h
5293
5294 // test twice, In case someone works with
5295 // a secondary radius server without defining
5296 // a primary one, this will work even then.
5297 if (i > 0 && !config->radiusport[i])
5298 config->radiusport[i] = config->radiusport[i-1];
5299 if (!config->radiusport[i])
5300 config->radiusport[i] = RADPORT;
5301 }
5302
5303 if (!config->numradiusservers)
5304 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5305
5306 // parse radius_authtypes_s
5307 config->radius_authtypes = config->radius_authprefer = 0;
5308 p = config->radius_authtypes_s;
5309 while (p && *p)
5310 {
5311 char *s = strpbrk(p, " \t,");
5312 int type = 0;
5313
5314 if (s)
5315 {
5316 *s++ = 0;
5317 while (*s == ' ' || *s == '\t')
5318 s++;
5319
5320 if (!*s)
5321 s = 0;
5322 }
5323
5324 if (!strncasecmp("chap", p, strlen(p)))
5325 type = AUTHCHAP;
5326 else if (!strncasecmp("pap", p, strlen(p)))
5327 type = AUTHPAP;
5328 else
5329 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5330
5331 config->radius_authtypes |= type;
5332 if (!config->radius_authprefer)
5333 config->radius_authprefer = type;
5334
5335 p = s;
5336 }
5337
5338 if (!config->radius_authtypes)
5339 {
5340 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5341 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5342 }
5343
5344 // normalise radius_authtypes_s
5345 if (config->radius_authprefer == AUTHPAP)
5346 {
5347 strcpy(config->radius_authtypes_s, "pap");
5348 if (config->radius_authtypes & AUTHCHAP)
5349 strcat(config->radius_authtypes_s, ", chap");
5350 }
5351 else
5352 {
5353 strcpy(config->radius_authtypes_s, "chap");
5354 if (config->radius_authtypes & AUTHPAP)
5355 strcat(config->radius_authtypes_s, ", pap");
5356 }
5357
5358 if (!config->radius_dae_port)
5359 config->radius_dae_port = DAEPORT;
5360
5361 #ifdef LAC
5362 if(!config->bind_portremotelns)
5363 config->bind_portremotelns = L2TPLACPORT;
5364 if(!config->bind_address_remotelns)
5365 config->bind_address_remotelns = INADDR_ANY;
5366 #endif
5367 if(!config->iftun_address)
5368 config->iftun_address = config->bind_address;
5369
5370 if (!*config->pppoe_ac_name)
5371 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5372
5373 // re-initialise the random number source
5374 initrandom(config->random_device);
5375
5376 // Update plugins
5377 for (i = 0; i < MAXPLUGINS; i++)
5378 {
5379 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5380 continue;
5381
5382 if (*config->plugins[i])
5383 {
5384 // Plugin added
5385 add_plugin(config->plugins[i]);
5386 }
5387 else if (*config->old_plugins[i])
5388 {
5389 // Plugin removed
5390 remove_plugin(config->old_plugins[i]);
5391 }
5392 }
5393
5394 // Guest change
5395 guest_accounts_num = 0;
5396 char *p2 = config->guest_user;
5397 while (p2 && *p2)
5398 {
5399 char *s = strpbrk(p2, " \t,");
5400 if (s)
5401 {
5402 *s++ = 0;
5403 while (*s == ' ' || *s == '\t')
5404 s++;
5405
5406 if (!*s)
5407 s = 0;
5408 }
5409
5410 strcpy(guest_users[guest_accounts_num], p2);
5411 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5412 guest_accounts_num++;
5413 p2 = s;
5414 }
5415 // Rebuild the guest_user array
5416 strcpy(config->guest_user, "");
5417 int ui = 0;
5418 for (ui=0; ui<guest_accounts_num; ui++)
5419 {
5420 strcat(config->guest_user, guest_users[ui]);
5421 if (ui<guest_accounts_num-1)
5422 {
5423 strcat(config->guest_user, ",");
5424 }
5425 }
5426
5427
5428 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5429 if (!config->multi_read_count) config->multi_read_count = 10;
5430 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5431 if (!*config->cluster_interface)
5432 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5433
5434 if (!config->cluster_hb_interval)
5435 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5436
5437 if (!config->cluster_hb_timeout)
5438 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5439
5440 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5441 {
5442 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5443 // late, ensure we're sufficiently larger than that
5444 int t = 4 * config->cluster_hb_interval + 11;
5445
5446 if (config->cluster_hb_timeout < t)
5447 {
5448 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5449 config->cluster_hb_timeout = t;
5450 }
5451
5452 // Push timing changes to the slaves immediately if we're the master
5453 if (config->cluster_iam_master)
5454 cluster_heartbeat();
5455
5456 interval = config->cluster_hb_interval;
5457 timeout = config->cluster_hb_timeout;
5458 }
5459
5460 // Write PID file
5461 if (*config->pid_file == '/' && !config->wrote_pid)
5462 {
5463 FILE *f;
5464 if ((f = fopen(config->pid_file, "w")))
5465 {
5466 fprintf(f, "%d\n", getpid());
5467 fclose(f);
5468 config->wrote_pid = 1;
5469 }
5470 else
5471 {
5472 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5473 }
5474 }
5475 }
5476
5477 static void read_config_file()
5478 {
5479 FILE *f;
5480
5481 if (!config->config_file) return;
5482 if (!(f = fopen(config->config_file, "r")))
5483 {
5484 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5485 return;
5486 }
5487
5488 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5489 cli_do_file(f);
5490 LOG(3, 0, 0, "Done reading config file\n");
5491 fclose(f);
5492 }
5493
5494 int sessionsetup(sessionidt s, tunnelidt t)
5495 {
5496 // A session now exists, set it up
5497 in_addr_t ip;
5498 char *user;
5499 sessionidt i;
5500 int r;
5501
5502 CSTAT(sessionsetup);
5503
5504 LOG(3, s, t, "Doing session setup for session\n");
5505
5506 // Join a bundle if the MRRU option is accepted
5507 if(session[s].mrru > 0 && session[s].bundle == 0)
5508 {
5509 LOG(3, s, t, "This session can be part of multilink bundle\n");
5510 if (join_bundle(s) > 0)
5511 cluster_send_bundle(session[s].bundle);
5512 else
5513 {
5514 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5515 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5516 return 0;
5517 }
5518 }
5519
5520 if (!session[s].ip)
5521 {
5522 assign_ip_address(s);
5523 if (!session[s].ip)
5524 {
5525 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5526 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5527 return 0;
5528 }
5529 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5530 fmtaddr(htonl(session[s].ip), 0));
5531 }
5532
5533 // Make sure this is right
5534 session[s].tunnel = t;
5535
5536 // zap old sessions with same IP and/or username
5537 // Don't kill gardened sessions - doing so leads to a DoS
5538 // from someone who doesn't need to know the password
5539 {
5540 ip = session[s].ip;
5541 user = session[s].user;
5542 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5543 {
5544 if (i == s) continue;
5545 if (!session[s].opened) break;
5546 // Allow duplicate sessions for multilink ones of the same bundle.
5547 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5548
5549 if (ip == session[i].ip)
5550 {
5551 sessionkill(i, "Duplicate IP address");
5552 cluster_listinvert_session(s, i);
5553 continue;
5554 }
5555
5556 if (config->allow_duplicate_users) continue;
5557 if (session[s].walled_garden || session[i].walled_garden) continue;
5558 // Guest change
5559 int found = 0;
5560 int gu;
5561 for (gu = 0; gu < guest_accounts_num; gu++)
5562 {
5563 if (!strcasecmp(user, guest_users[gu]))
5564 {
5565 found = 1;
5566 break;
5567 }
5568 }
5569 if (found) continue;
5570
5571 // Drop the new session in case of duplicate sessionss, not the old one.
5572 if (!strcasecmp(user, session[i].user))
5573 sessionkill(i, "Duplicate session for users");
5574 }
5575 }
5576
5577 // no need to set a route for the same IP address of the bundle
5578 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5579 {
5580 int routed = 0;
5581
5582 // Add the route for this session.
5583 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5584 {
5585 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5586 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5587 routed++;
5588
5589 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5590 }
5591
5592 // Static IPs need to be routed if not already
5593 // convered by a Framed-Route. Anything else is part
5594 // of the IP address pool and is already routed, it
5595 // just needs to be added to the IP cache.
5596 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5597 if (session[s].ip_pool_index == -1) // static ip
5598 {
5599 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5600 }
5601 else
5602 cache_ipmap(session[s].ip, s);
5603 }
5604
5605 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5606 lcp_open(s, t); // transition to Network phase and send initial IPCP
5607
5608 // Run the plugin's against this new session.
5609 {
5610 struct param_new_session data = { &tunnel[t], &session[s] };
5611 run_plugins(PLUGIN_NEW_SESSION, &data);
5612 }
5613
5614 // Allocate TBFs if throttled
5615 if (session[s].throttle_in || session[s].throttle_out)
5616 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5617
5618 session[s].last_packet = session[s].last_data = time_now;
5619
5620 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5621 fmtaddr(htonl(session[s].ip), 0),
5622 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5623
5624 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5625
5626 return 1; // RADIUS OK and IP allocated, done...
5627 }
5628
5629 //
5630 // This session just got dropped on us by the master or something.
5631 // Make sure our tables up up to date...
5632 //
5633 int load_session(sessionidt s, sessiont *new)
5634 {
5635 int i;
5636 int newip = 0;
5637
5638 // Sanity checks.
5639 if (new->ip_pool_index >= MAXIPPOOL ||
5640 new->tunnel >= MAXTUNNEL)
5641 {
5642 LOG(0, s, 0, "Strange session update received!\n");
5643 // FIXME! What to do here?
5644 return 0;
5645 }
5646
5647 //
5648 // Ok. All sanity checks passed. Now we're committed to
5649 // loading the new session.
5650 //
5651
5652 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5653
5654 // See if routes/ip cache need updating
5655 if (new->ip != session[s].ip)
5656 newip++;
5657
5658 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5659 if (new->route[i].ip != session[s].route[i].ip ||
5660 new->route[i].prefixlen != session[s].route[i].prefixlen)
5661 newip++;
5662
5663 // needs update
5664 if (newip)
5665 {
5666 int routed = 0;
5667
5668 // remove old routes...
5669 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5670 {
5671 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5672 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5673 routed++;
5674
5675 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5676 }
5677
5678 // ...ip
5679 if (session[s].ip)
5680 {
5681 if (session[s].ip_pool_index == -1) // static IP
5682 {
5683 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5684 }
5685 else // It's part of the IP pool, remove it manually.
5686 uncache_ipmap(session[s].ip);
5687 }
5688
5689 routed = 0;
5690
5691 // add new routes...
5692 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5693 {
5694 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5695 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5696 routed++;
5697
5698 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5699 }
5700
5701 // ...ip
5702 if (new->ip)
5703 {
5704 // If there's a new one, add it.
5705 if (new->ip_pool_index == -1)
5706 {
5707 if (!routed) routeset(s, new->ip, 0, 0, 1);
5708 }
5709 else
5710 cache_ipmap(new->ip, s);
5711 }
5712 }
5713
5714 // check v6 routing
5715 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5716 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5717
5718 // check filters
5719 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5720 {
5721 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5722 new->filter_in = 0;
5723 }
5724
5725 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5726 {
5727 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5728 new->filter_out = 0;
5729 }
5730
5731 if (new->filter_in != session[s].filter_in)
5732 {
5733 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5734 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5735 }
5736
5737 if (new->filter_out != session[s].filter_out)
5738 {
5739 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5740 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5741 }
5742
5743 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5744 // for walking the sessions to forward byte counts to the master.
5745 config->cluster_highest_sessionid = s;
5746
5747 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5748
5749 // Do fixups into address pool.
5750 if (new->ip_pool_index != -1)
5751 fix_address_pool(s);
5752
5753 return 1;
5754 }
5755
5756 static void initplugins()
5757 {
5758 int i;
5759
5760 loaded_plugins = ll_init();
5761 // Initialize the plugins to nothing
5762 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5763 plugins[i] = ll_init();
5764 }
5765
5766 static void *open_plugin(char *plugin_name, int load)
5767 {
5768 char path[256] = "";
5769
5770 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5771 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5772 return dlopen(path, RTLD_NOW);
5773 }
5774
5775 // plugin callback to get a config value
5776 static void *getconfig(char *key, enum config_typet type)
5777 {
5778 int i;
5779
5780 for (i = 0; config_values[i].key; i++)
5781 {
5782 if (!strcmp(config_values[i].key, key))
5783 {
5784 if (config_values[i].type == type)
5785 return ((void *) config) + config_values[i].offset;
5786
5787 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5788 key, type, config_values[i].type);
5789
5790 return 0;
5791 }
5792 }
5793
5794 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5795 return 0;
5796 }
5797
5798 static int add_plugin(char *plugin_name)
5799 {
5800 static struct pluginfuncs funcs = {
5801 _log,
5802 _log_hex,
5803 fmtaddr,
5804 sessionbyuser,
5805 sessiontbysessionidt,
5806 sessionidtbysessiont,
5807 radiusnew,
5808 radiussend,
5809 getconfig,
5810 sessionshutdown,
5811 sessionkill,
5812 throttle_session,
5813 cluster_send_session,
5814 };
5815
5816 void *p = open_plugin(plugin_name, 1);
5817 int (*initfunc)(struct pluginfuncs *);
5818 int i;
5819
5820 if (!p)
5821 {
5822 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5823 return -1;
5824 }
5825
5826 if (ll_contains(loaded_plugins, p))
5827 {
5828 dlclose(p);
5829 return 0; // already loaded
5830 }
5831
5832 {
5833 int *v = dlsym(p, "plugin_api_version");
5834 if (!v || *v != PLUGIN_API_VERSION)
5835 {
5836 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5837 dlclose(p);
5838 return -1;
5839 }
5840 }
5841
5842 if ((initfunc = dlsym(p, "plugin_init")))
5843 {
5844 if (!initfunc(&funcs))
5845 {
5846 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5847 dlclose(p);
5848 return -1;
5849 }
5850 }
5851
5852 ll_push(loaded_plugins, p);
5853
5854 for (i = 0; i < max_plugin_functions; i++)
5855 {
5856 void *x;
5857 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5858 {
5859 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5860 ll_push(plugins[i], x);
5861 }
5862 }
5863
5864 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5865 return 1;
5866 }
5867
5868 static void run_plugin_done(void *plugin)
5869 {
5870 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5871
5872 if (donefunc)
5873 donefunc();
5874 }
5875
5876 static int remove_plugin(char *plugin_name)
5877 {
5878 void *p = open_plugin(plugin_name, 0);
5879 int loaded = 0;
5880
5881 if (!p)
5882 return -1;
5883
5884 if (ll_contains(loaded_plugins, p))
5885 {
5886 int i;
5887 for (i = 0; i < max_plugin_functions; i++)
5888 {
5889 void *x;
5890 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5891 ll_delete(plugins[i], x);
5892 }
5893
5894 ll_delete(loaded_plugins, p);
5895 run_plugin_done(p);
5896 loaded = 1;
5897 }
5898
5899 dlclose(p);
5900 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5901 return loaded;
5902 }
5903
5904 int run_plugins(int plugin_type, void *data)
5905 {
5906 int (*func)(void *data);
5907
5908 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5909 return PLUGIN_RET_ERROR;
5910
5911 ll_reset(plugins[plugin_type]);
5912 while ((func = ll_next(plugins[plugin_type])))
5913 {
5914 int r = func(data);
5915
5916 if (r != PLUGIN_RET_OK)
5917 return r; // stop here
5918 }
5919
5920 return PLUGIN_RET_OK;
5921 }
5922
5923 static void plugins_done()
5924 {
5925 void *p;
5926
5927 ll_reset(loaded_plugins);
5928 while ((p = ll_next(loaded_plugins)))
5929 run_plugin_done(p);
5930 }
5931
5932 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5933 {
5934 struct nsctl request;
5935 struct nsctl response;
5936 int type = unpack_control(&request, buf, len);
5937 int r;
5938 void *p;
5939
5940 if (log_stream && config->debug >= 4)
5941 {
5942 if (type < 0)
5943 {
5944 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5945 fmtaddr(addr->sin_addr.s_addr, 0), type);
5946 }
5947 else
5948 {
5949 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5950 dump_control(&request, log_stream);
5951 }
5952 }
5953
5954 switch (type)
5955 {
5956 case NSCTL_REQ_LOAD:
5957 if (request.argc != 1)
5958 {
5959 response.type = NSCTL_RES_ERR;
5960 response.argc = 1;
5961 response.argv[0] = "name of plugin required";
5962 }
5963 else if ((r = add_plugin(request.argv[0])) < 1)
5964 {
5965 response.type = NSCTL_RES_ERR;
5966 response.argc = 1;
5967 response.argv[0] = !r
5968 ? "plugin already loaded"
5969 : "error loading plugin";
5970 }
5971 else
5972 {
5973 response.type = NSCTL_RES_OK;
5974 response.argc = 0;
5975 }
5976
5977 break;
5978
5979 case NSCTL_REQ_UNLOAD:
5980 if (request.argc != 1)
5981 {
5982 response.type = NSCTL_RES_ERR;
5983 response.argc = 1;
5984 response.argv[0] = "name of plugin required";
5985 }
5986 else if ((r = remove_plugin(request.argv[0])) < 1)
5987 {
5988 response.type = NSCTL_RES_ERR;
5989 response.argc = 1;
5990 response.argv[0] = !r
5991 ? "plugin not loaded"
5992 : "plugin not found";
5993 }
5994 else
5995 {
5996 response.type = NSCTL_RES_OK;
5997 response.argc = 0;
5998 }
5999
6000 break;
6001
6002 case NSCTL_REQ_HELP:
6003 response.type = NSCTL_RES_OK;
6004 response.argc = 0;
6005
6006 ll_reset(loaded_plugins);
6007 while ((p = ll_next(loaded_plugins)))
6008 {
6009 char **help = dlsym(p, "plugin_control_help");
6010 while (response.argc < 0xff && help && *help)
6011 response.argv[response.argc++] = *help++;
6012 }
6013
6014 break;
6015
6016 case NSCTL_REQ_CONTROL:
6017 {
6018 struct param_control param = {
6019 config->cluster_iam_master,
6020 request.argc,
6021 request.argv,
6022 0,
6023 NULL,
6024 };
6025
6026 int r = run_plugins(PLUGIN_CONTROL, &param);
6027
6028 if (r == PLUGIN_RET_ERROR)
6029 {
6030 response.type = NSCTL_RES_ERR;
6031 response.argc = 1;
6032 response.argv[0] = param.additional
6033 ? param.additional
6034 : "error returned by plugin";
6035 }
6036 else if (r == PLUGIN_RET_NOTMASTER)
6037 {
6038 static char msg[] = "must be run on master: 000.000.000.000";
6039
6040 response.type = NSCTL_RES_ERR;
6041 response.argc = 1;
6042 if (config->cluster_master_address)
6043 {
6044 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6045 response.argv[0] = msg;
6046 }
6047 else
6048 {
6049 response.argv[0] = "must be run on master: none elected";
6050 }
6051 }
6052 else if (!(param.response & NSCTL_RESPONSE))
6053 {
6054 response.type = NSCTL_RES_ERR;
6055 response.argc = 1;
6056 response.argv[0] = param.response
6057 ? "unrecognised response value from plugin"
6058 : "unhandled action";
6059 }
6060 else
6061 {
6062 response.type = param.response;
6063 response.argc = 0;
6064 if (param.additional)
6065 {
6066 response.argc = 1;
6067 response.argv[0] = param.additional;
6068 }
6069 }
6070 }
6071
6072 break;
6073
6074 default:
6075 response.type = NSCTL_RES_ERR;
6076 response.argc = 1;
6077 response.argv[0] = "error unpacking control packet";
6078 }
6079
6080 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6081 if (!buf)
6082 {
6083 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6084 return;
6085 }
6086
6087 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6088 if (r > 0)
6089 {
6090 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6091 if (log_stream && config->debug >= 4)
6092 {
6093 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6094 dump_control(&response, log_stream);
6095 }
6096 }
6097 else
6098 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6099 fmtaddr(addr->sin_addr.s_addr, 0), r);
6100
6101 free(buf);
6102 }
6103
6104 static tunnelidt new_tunnel()
6105 {
6106 tunnelidt i;
6107 for (i = 1; i < MAXTUNNEL; i++)
6108 {
6109 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6110 {
6111 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6112 if (i > config->cluster_highest_tunnelid)
6113 config->cluster_highest_tunnelid = i;
6114 return i;
6115 }
6116 }
6117 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6118 return 0;
6119 }
6120
6121 //
6122 // We're becoming the master. Do any required setup..
6123 //
6124 // This is principally telling all the plugins that we're
6125 // now a master, and telling them about all the sessions
6126 // that are active too..
6127 //
6128 void become_master(void)
6129 {
6130 int s, i;
6131 static struct event_data d[RADIUS_FDS];
6132 struct epoll_event e;
6133
6134 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6135
6136 // running a bunch of iptables commands is slow and can cause
6137 // the master to drop tunnels on takeover--kludge around the
6138 // problem by forking for the moment (note: race)
6139 if (!fork_and_close())
6140 {
6141 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6142 {
6143 if (!session[s].opened) // Not an in-use session.
6144 continue;
6145
6146 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6147 }
6148 exit(0);
6149 }
6150
6151 // add radius fds
6152 e.events = EPOLLIN;
6153 for (i = 0; i < RADIUS_FDS; i++)
6154 {
6155 d[i].type = FD_TYPE_RADIUS;
6156 d[i].index = i;
6157 e.data.ptr = &d[i];
6158
6159 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6160 }
6161 }
6162
6163 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6164 {
6165 int s, i;
6166 int count = 0;
6167 int buckets[64];
6168
6169 if (CLI_HELP_REQUESTED)
6170 return CLI_HELP_NO_ARGS;
6171
6172 time(&time_now);
6173 for (i = 0; i < 64;++i) buckets[i] = 0;
6174
6175 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6176 {
6177 int idle;
6178 if (!session[s].opened)
6179 continue;
6180
6181 idle = time_now - session[s].last_data;
6182 idle /= 5 ; // In multiples of 5 seconds.
6183 if (idle < 0)
6184 idle = 0;
6185 if (idle > 63)
6186 idle = 63;
6187
6188 ++count;
6189 ++buckets[idle];
6190 }
6191
6192 for (i = 0; i < 63; ++i)
6193 {
6194 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6195 }
6196 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6197 cli_print(cli, "%d total sessions open.", count);
6198 return CLI_OK;
6199 }
6200
6201 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6202 {
6203 int s, i;
6204 int count = 0;
6205 int buckets[64];
6206
6207 if (CLI_HELP_REQUESTED)
6208 return CLI_HELP_NO_ARGS;
6209
6210 time(&time_now);
6211 for (i = 0; i < 64;++i) buckets[i] = 0;
6212
6213 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6214 {
6215 int open = 0, d;
6216 if (!session[s].opened)
6217 continue;
6218
6219 d = time_now - session[s].opened;
6220 if (d < 0)
6221 d = 0;
6222 while (d > 1 && open < 32)
6223 {
6224 ++open;
6225 d >>= 1; // half.
6226 }
6227 ++count;
6228 ++buckets[open];
6229 }
6230
6231 s = 1;
6232 for (i = 0; i < 30; ++i)
6233 {
6234 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6235 s <<= 1;
6236 }
6237 cli_print(cli, "%d total sessions open.", count);
6238 return CLI_OK;
6239 }
6240
6241 /* Unhide an avp.
6242 *
6243 * This unencodes the AVP using the L2TP secret and the previously
6244 * stored random vector. It overwrites the hidden data with the
6245 * unhidden AVP subformat.
6246 */
6247 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6248 {
6249 MD5_CTX ctx;
6250 uint8_t digest[16];
6251 uint8_t *last;
6252 size_t d = 0;
6253 uint16_t m = htons(type);
6254
6255 // Compute initial pad
6256 MD5_Init(&ctx);
6257 MD5_Update(&ctx, (unsigned char *) &m, 2);
6258 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6259 MD5_Update(&ctx, vector, vec_len);
6260 MD5_Final(digest, &ctx);
6261
6262 // pointer to last decoded 16 octets
6263 last = value;
6264
6265 while (len > 0)
6266 {
6267 // calculate a new pad based on the last decoded block
6268 if (d >= sizeof(digest))
6269 {
6270 MD5_Init(&ctx);
6271 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6272 MD5_Update(&ctx, last, sizeof(digest));
6273 MD5_Final(digest, &ctx);
6274
6275 d = 0;
6276 last = value;
6277 }
6278
6279 *value++ ^= digest[d++];
6280 len--;
6281 }
6282 }
6283
6284 int find_filter(char const *name, size_t len)
6285 {
6286 int free = -1;
6287 int i;
6288
6289 for (i = 0; i < MAXFILTER; i++)
6290 {
6291 if (!*ip_filters[i].name)
6292 {
6293 if (free < 0)
6294 free = i;
6295
6296 continue;
6297 }
6298
6299 if (strlen(ip_filters[i].name) != len)
6300 continue;
6301
6302 if (!strncmp(ip_filters[i].name, name, len))
6303 return i;
6304 }
6305
6306 return free;
6307 }
6308
6309 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6310 {
6311 switch (p->op)
6312 {
6313 case FILTER_PORT_OP_EQ: return port == p->port;
6314 case FILTER_PORT_OP_NEQ: return port != p->port;
6315 case FILTER_PORT_OP_GT: return port > p->port;
6316 case FILTER_PORT_OP_LT: return port < p->port;
6317 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6318 }
6319
6320 return 0;
6321 }
6322
6323 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6324 {
6325 switch (op)
6326 {
6327 case FILTER_FLAG_OP_ANY:
6328 return (flags & sflags) || (~flags & cflags);
6329
6330 case FILTER_FLAG_OP_ALL:
6331 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6332
6333 case FILTER_FLAG_OP_EST:
6334 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6335 }
6336
6337 return 0;
6338 }
6339
6340 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6341 {
6342 uint16_t frag_offset;
6343 uint8_t proto;
6344 in_addr_t src_ip;
6345 in_addr_t dst_ip;
6346 uint16_t src_port = 0;
6347 uint16_t dst_port = 0;
6348 uint8_t flags = 0;
6349 ip_filter_rulet *rule;
6350
6351 if (len < 20) // up to end of destination address
6352 return 0;
6353
6354 if ((*buf >> 4) != 4) // IPv4
6355 return 0;
6356
6357 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6358 proto = buf[9];
6359 src_ip = *(in_addr_t *) (buf + 12);
6360 dst_ip = *(in_addr_t *) (buf + 16);
6361
6362 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6363 {
6364 int l = (buf[0] & 0xf) * 4; // length of IP header
6365 if (len < l + 4) // ports
6366 return 0;
6367
6368 src_port = ntohs(*(uint16_t *) (buf + l));
6369 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6370 if (proto == IPPROTO_TCP)
6371 {
6372 if (len < l + 14) // flags
6373 return 0;
6374
6375 flags = buf[l + 13] & 0x3f;
6376 }
6377 }
6378
6379 for (rule = ip_filters[filter].rules; rule->action; rule++)
6380 {
6381 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6382 continue;
6383
6384 if (rule->src_wild != INADDR_BROADCAST &&
6385 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6386 continue;
6387
6388 if (rule->dst_wild != INADDR_BROADCAST &&
6389 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6390 continue;
6391
6392 if (frag_offset)
6393 {
6394 // layer 4 deny rules are skipped
6395 if (rule->action == FILTER_ACTION_DENY &&
6396 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6397 continue;
6398 }
6399 else
6400 {
6401 if (rule->frag)
6402 continue;
6403
6404 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6405 {
6406 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6407 continue;
6408
6409 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6410 continue;
6411
6412 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6413 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6414 continue;
6415 }
6416 }
6417
6418 // matched
6419 rule->counter++;
6420 return rule->action == FILTER_ACTION_PERMIT;
6421 }
6422
6423 // default deny
6424 return 0;
6425 }
6426
6427 #ifdef LAC
6428
6429 tunnelidt lac_new_tunnel()
6430 {
6431 return new_tunnel();
6432 }
6433
6434 void lac_tunnelclear(tunnelidt t)
6435 {
6436 tunnelclear(t);
6437 }
6438
6439 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6440 {
6441 uint16_t version = 0x0100; // protocol version
6442
6443 tunnel[t].state = TUNNELOPENING;
6444
6445 // Sent SCCRQ - Start Control Connection Request
6446 controlt *c = controlnew(1); // sending SCCRQ
6447 controls(c, 7, hostname, 1); // host name
6448 controls(c, 8, Vendor_name, 1); // Vendor name
6449 control16(c, 2, version, 1); // protocol version
6450 control32(c, 3, 3, 1); // framing Capabilities
6451 control16(c, 9, t, 1); // assigned tunnel
6452 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6453 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6454 controladd(c, 0, t); // send
6455 }
6456
6457 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6458 {
6459 // Sent ICRQ Incoming-call-request
6460 controlt *c = controlnew(10); // ICRQ
6461
6462 control16(c, 14, s, 1); // assigned sesion
6463 call_serial_number++;
6464 control32(c, 15, call_serial_number, 1); // call serial number
6465 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6466 controladd(c, 0, t); // send
6467 }
6468
6469 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6470 {
6471 tunnelshutdown(t, reason, result, error, msg);
6472 }
6473
6474 #endif