a54413470775e3c92b6faa8791582f7c7b9424fc
[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 char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.173 2009-12-08 14:49:28 bodea Exp $";
8
9 #include <arpa/inet.h>
10 #include <assert.h>
11 #include <errno.h>
12 #include <fcntl.h>
13 #include <linux/if_tun.h>
14 #define SYSLOG_NAMES
15 #include <syslog.h>
16 #include <malloc.h>
17 #include <math.h>
18 #include <net/route.h>
19 #include <sys/mman.h>
20 #include <netdb.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
23 #include <stdarg.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <ctype.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <sys/stat.h>
31 #include <sys/time.h>
32 #include <sys/resource.h>
33 #include <sys/wait.h>
34 #include <linux/if.h>
35 #include <stddef.h>
36 #include <time.h>
37 #include <dlfcn.h>
38 #include <unistd.h>
39 #include <sched.h>
40 #include <sys/sysinfo.h>
41 #include <libcli.h>
42
43 #include "md5.h"
44 #include "l2tpns.h"
45 #include "cluster.h"
46 #include "plugin.h"
47 #include "ll.h"
48 #include "constants.h"
49 #include "control.h"
50 #include "util.h"
51 #include "tbf.h"
52
53 #ifdef BGP
54 #include "bgp.h"
55 #endif
56
57 // Globals
58 configt *config = NULL; // all configuration
59 int tunfd = -1; // tun interface file handle. (network device)
60 int udpfd = -1; // UDP file handle
61 int controlfd = -1; // Control signal handle
62 int clifd = -1; // Socket listening for CLI connections.
63 int daefd = -1; // Socket listening for DAE connections.
64 int snoopfd = -1; // UDP file handle for sending out intercept data
65 int *radfds = NULL; // RADIUS requests file handles
66 int ifrfd = -1; // File descriptor for routing, etc
67 int ifr6fd = -1; // File descriptor for IPv6 routing, etc
68 int rand_fd = -1; // Random data source
69 int cluster_sockfd = -1; // Intra-cluster communications socket.
70 int epollfd = -1; // event polling
71 time_t basetime = 0; // base clock
72 char hostname[1000] = ""; // us.
73 static int tunidx; // ifr_ifindex of tun device
74 static int syslog_log = 0; // are we logging to syslog
75 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id = 0; // Unique ID for radius accounting
77 // Guest change
78 char guest_users[10][32]; // Array of guest users
79 int guest_accounts_num = 0; // Number of guest users
80
81 // calculated from config->l2tp_mtu
82 uint16_t MRU = 0; // PPP MRU
83 uint16_t MSS = 0; // TCP MSS
84
85 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
86 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
87
88 union iphash {
89 sessionidt sess;
90 union iphash *idx;
91 } ip_hash[256]; // Mapping from IP address to session structures.
92
93 struct ipv6radix {
94 sessionidt sess;
95 struct ipv6radix *branch;
96 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
97
98 // Traffic counters.
99 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
100 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
101 uint32_t eth_tx = 0;
102
103 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
104 time_t time_now = 0; // Current time in seconds since epoch.
105 static char time_now_string[64] = {0}; // Current time as a string.
106 static int time_changed = 0; // time_now changed
107 char main_quit = 0; // True if we're in the process of exiting.
108 static char main_reload = 0; // Re-load pending
109 linked_list *loaded_plugins;
110 linked_list *plugins[MAX_PLUGIN_TYPES];
111
112 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
113 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
114
115 config_descriptt config_values[] = {
116 CONFIG("debug", debug, INT),
117 CONFIG("log_file", log_filename, STRING),
118 CONFIG("pid_file", pid_file, STRING),
119 CONFIG("random_device", random_device, STRING),
120 CONFIG("l2tp_secret", l2tp_secret, STRING),
121 CONFIG("l2tp_mtu", l2tp_mtu, INT),
122 CONFIG("ppp_restart_time", ppp_restart_time, INT),
123 CONFIG("ppp_max_configure", ppp_max_configure, INT),
124 CONFIG("ppp_max_failure", ppp_max_failure, INT),
125 CONFIG("primary_dns", default_dns1, IPv4),
126 CONFIG("secondary_dns", default_dns2, IPv4),
127 CONFIG("primary_radius", radiusserver[0], IPv4),
128 CONFIG("secondary_radius", radiusserver[1], IPv4),
129 CONFIG("primary_radius_port", radiusport[0], SHORT),
130 CONFIG("secondary_radius_port", radiusport[1], SHORT),
131 CONFIG("radius_accounting", radius_accounting, BOOL),
132 CONFIG("radius_interim", radius_interim, INT),
133 CONFIG("radius_secret", radiussecret, STRING),
134 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
135 CONFIG("radius_dae_port", radius_dae_port, SHORT),
136 CONFIG("radius_bind_min", radius_bind_min, SHORT),
137 CONFIG("radius_bind_max", radius_bind_max, SHORT),
138 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
139 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
140 CONFIG("guest_account", guest_user, STRING),
141 CONFIG("bind_address", bind_address, IPv4),
142 CONFIG("peer_address", peer_address, IPv4),
143 CONFIG("send_garp", send_garp, BOOL),
144 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
145 CONFIG("throttle_buckets", num_tbfs, INT),
146 CONFIG("accounting_dir", accounting_dir, STRING),
147 CONFIG("dump_speed", dump_speed, BOOL),
148 CONFIG("multi_read_count", multi_read_count, INT),
149 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
150 CONFIG("lock_pages", lock_pages, BOOL),
151 CONFIG("icmp_rate", icmp_rate, INT),
152 CONFIG("packet_limit", max_packets, INT),
153 CONFIG("cluster_address", cluster_address, IPv4),
154 CONFIG("cluster_interface", cluster_interface, STRING),
155 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
156 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
157 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
158 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
159 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
160 { NULL, 0, 0, 0 },
161 };
162
163 static char *plugin_functions[] = {
164 NULL,
165 "plugin_pre_auth",
166 "plugin_post_auth",
167 "plugin_packet_rx",
168 "plugin_packet_tx",
169 "plugin_timer",
170 "plugin_new_session",
171 "plugin_kill_session",
172 "plugin_control",
173 "plugin_radius_response",
174 "plugin_radius_reset",
175 "plugin_radius_account",
176 "plugin_become_master",
177 "plugin_new_session_master",
178 };
179
180 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
181
182 // Counters for shutdown sessions
183 static sessiont shut_acct[8192];
184 static sessionidt shut_acct_n = 0;
185
186 tunnelt *tunnel = NULL; // Array of tunnel structures.
187 bundlet *bundle = NULL; // Array of bundle structures.
188 fragmentationt *frag = NULL; // Array of fragmentation structures.
189 sessiont *session = NULL; // Array of session structures.
190 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
191 radiust *radius = NULL; // Array of radius structures.
192 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
193 ip_filtert *ip_filters = NULL; // Array of named filters.
194 static controlt *controlfree = 0;
195 struct Tstats *_statistics = NULL;
196 #ifdef RINGBUFFER
197 struct Tringbuffer *ringbuffer = NULL;
198 #endif
199
200 static void cache_ipmap(in_addr_t ip, sessionidt s);
201 static void uncache_ipmap(in_addr_t ip);
202 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
203 static void free_ip_address(sessionidt s);
204 static void dump_acct_info(int all);
205 static void sighup_handler(int sig);
206 static void shutdown_handler(int sig);
207 static void sigchild_handler(int sig);
208 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
209 static void update_config(void);
210 static void read_config_file(void);
211 static void initplugins(void);
212 static int add_plugin(char *plugin_name);
213 static int remove_plugin(char *plugin_name);
214 static void plugins_done(void);
215 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
216 static tunnelidt new_tunnel(void);
217 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
218 static void bundleclear(bundleidt b);
219
220 // on slaves, alow BGP to withdraw cleanly before exiting
221 #define QUIT_DELAY 5
222
223 // quit actions (master)
224 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
225 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
226
227 // return internal time (10ths since process startup), set f if given
228 // as a side-effect sets time_now, and time_changed
229 static clockt now(double *f)
230 {
231 struct timeval t;
232 gettimeofday(&t, 0);
233 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
234 if (t.tv_sec != time_now)
235 {
236 time_now = t.tv_sec;
237 time_changed++;
238 }
239 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
240 }
241
242 // work out a retry time based on try number
243 // This is a straight bounded exponential backoff.
244 // Maximum re-try time is 32 seconds. (2^5).
245 clockt backoff(uint8_t try)
246 {
247 if (try > 5) try = 5; // max backoff
248 return now(NULL) + 10 * (1 << try);
249 }
250
251
252 //
253 // Log a debug message. Typically called via the LOG macro
254 //
255 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
256 {
257 static char message[65536] = {0};
258 va_list ap;
259
260 #ifdef RINGBUFFER
261 if (ringbuffer)
262 {
263 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
264 ringbuffer->tail = 0;
265 if (ringbuffer->tail == ringbuffer->head)
266 if (++ringbuffer->head >= RINGBUFFER_SIZE)
267 ringbuffer->head = 0;
268
269 ringbuffer->buffer[ringbuffer->tail].level = level;
270 ringbuffer->buffer[ringbuffer->tail].session = s;
271 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
272 va_start(ap, format);
273 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
274 va_end(ap);
275 }
276 #endif
277
278 if (config->debug < level) return;
279
280 va_start(ap, format);
281 vsnprintf(message, sizeof(message), format, ap);
282
283 if (log_stream)
284 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
285 else if (syslog_log)
286 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
287
288 va_end(ap);
289 }
290
291 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
292 {
293 int i, j;
294 const uint8_t *d = data;
295
296 if (config->debug < level) return;
297
298 // No support for _log_hex to syslog
299 if (log_stream)
300 {
301 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
302 setvbuf(log_stream, NULL, _IOFBF, 16384);
303
304 for (i = 0; i < maxsize; )
305 {
306 fprintf(log_stream, "%4X: ", i);
307 for (j = i; j < maxsize && j < (i + 16); j++)
308 {
309 fprintf(log_stream, "%02X ", d[j]);
310 if (j == i + 7)
311 fputs(": ", log_stream);
312 }
313
314 for (; j < i + 16; j++)
315 {
316 fputs(" ", log_stream);
317 if (j == i + 7)
318 fputs(": ", log_stream);
319 }
320
321 fputs(" ", log_stream);
322 for (j = i; j < maxsize && j < (i + 16); j++)
323 {
324 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
325 fputc(d[j], log_stream);
326 else
327 fputc('.', log_stream);
328
329 if (j == i + 7)
330 fputs(" ", log_stream);
331 }
332
333 i = j;
334 fputs("\n", log_stream);
335 }
336
337 fflush(log_stream);
338 setbuf(log_stream, NULL);
339 }
340 }
341
342 // update a counter, accumulating 2^32 wraps
343 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
344 {
345 uint32_t new = *counter + delta;
346 if (new < *counter)
347 (*wrap)++;
348
349 *counter = new;
350 }
351
352 // initialise the random generator
353 static void initrandom(char *source)
354 {
355 static char path[sizeof(config->random_device)] = "*undefined*";
356
357 // reinitialise only if we are forced to do so or if the config has changed
358 if (source && !strncmp(path, source, sizeof(path)))
359 return;
360
361 // close previous source, if any
362 if (rand_fd >= 0)
363 close(rand_fd);
364
365 rand_fd = -1;
366
367 if (source)
368 {
369 // register changes
370 snprintf(path, sizeof(path), "%s", source);
371
372 if (*path == '/')
373 {
374 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
375 if (rand_fd < 0)
376 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
377 path, strerror(errno));
378 }
379 }
380 }
381
382 // fill buffer with random data
383 void random_data(uint8_t *buf, int len)
384 {
385 int n = 0;
386
387 CSTAT(random_data);
388 if (rand_fd >= 0)
389 {
390 n = read(rand_fd, buf, len);
391 if (n >= len) return;
392 if (n < 0)
393 {
394 if (errno != EAGAIN)
395 {
396 LOG(0, 0, 0, "Error reading from random source: %s\n",
397 strerror(errno));
398
399 // fall back to rand()
400 initrandom(NULL);
401 }
402
403 n = 0;
404 }
405 }
406
407 // append missing data
408 while (n < len)
409 // not using the low order bits from the prng stream
410 buf[n++] = (rand() >> 4) & 0xff;
411 }
412
413 // Add a route
414 //
415 // This adds it to the routing table, advertises it
416 // via BGP if enabled, and stuffs it into the
417 // 'sessionbyip' cache.
418 //
419 // 'ip' and 'mask' must be in _host_ order.
420 //
421 static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
422 {
423 struct rtentry r;
424 int i;
425
426 if (!mask) mask = 0xffffffff;
427
428 ip &= mask; // Force the ip to be the first one in the route.
429
430 memset(&r, 0, sizeof(r));
431 r.rt_dev = config->tundevice;
432 r.rt_dst.sa_family = AF_INET;
433 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
434 r.rt_gateway.sa_family = AF_INET;
435 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
436 r.rt_genmask.sa_family = AF_INET;
437 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
438 r.rt_flags = (RTF_UP | RTF_STATIC);
439 if (gw)
440 r.rt_flags |= RTF_GATEWAY;
441 else if (mask == 0xffffffff)
442 r.rt_flags |= RTF_HOST;
443
444 LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
445 fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
446 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
447
448 if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
449 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
450
451 #ifdef BGP
452 if (add)
453 bgp_add_route(htonl(ip), htonl(mask));
454 else
455 bgp_del_route(htonl(ip), htonl(mask));
456 #endif /* BGP */
457
458 // Add/Remove the IPs to the 'sessionbyip' cache.
459 // Note that we add the zero address in the case of
460 // a network route. Roll on CIDR.
461
462 // Note that 's == 0' implies this is the address pool.
463 // We still cache it here, because it will pre-fill
464 // the malloc'ed tree.
465
466 if (s)
467 {
468 if (!add) // Are we deleting a route?
469 s = 0; // Caching the session as '0' is the same as uncaching.
470
471 for (i = ip; (i&mask) == (ip&mask) ; ++i)
472 cache_ipmap(i, s);
473 }
474 }
475
476 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
477 {
478 struct in6_rtmsg rt;
479 char ipv6addr[INET6_ADDRSTRLEN];
480
481 if (ifr6fd < 0)
482 {
483 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
484 return;
485 }
486
487 memset(&rt, 0, sizeof(rt));
488
489 memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
490 rt.rtmsg_dst_len = prefixlen;
491 rt.rtmsg_metric = 1;
492 rt.rtmsg_flags = RTF_UP;
493 rt.rtmsg_ifindex = tunidx;
494
495 LOG(1, 0, 0, "Route %s %s/%d\n",
496 add ? "add" : "del",
497 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
498 prefixlen);
499
500 if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
501 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
502 strerror(errno));
503
504 // FIXME: need to add BGP routing (RFC2858)
505
506 if (s)
507 {
508 if (!add) // Are we deleting a route?
509 s = 0; // Caching the session as '0' is the same as uncaching.
510
511 cache_ipv6map(ip, prefixlen, s);
512 }
513
514 return;
515 }
516
517 // defined in linux/ipv6.h, but tricky to include from user-space
518 // TODO: move routing to use netlink rather than ioctl
519 struct in6_ifreq {
520 struct in6_addr ifr6_addr;
521 __u32 ifr6_prefixlen;
522 unsigned int ifr6_ifindex;
523 };
524
525 //
526 // Set up TUN interface
527 static void inittun(void)
528 {
529 struct ifreq ifr;
530 struct in6_ifreq ifr6;
531 struct sockaddr_in sin = {0};
532 memset(&ifr, 0, sizeof(ifr));
533 ifr.ifr_flags = IFF_TUN;
534
535 tunfd = open(TUNDEVICE, O_RDWR);
536 if (tunfd < 0)
537 { // fatal
538 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
539 exit(1);
540 }
541 {
542 int flags = fcntl(tunfd, F_GETFL, 0);
543 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
544 }
545 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
546 {
547 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
548 exit(1);
549 }
550 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
551 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
552 ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
553
554 sin.sin_family = AF_INET;
555 sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
556 memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
557
558 if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
559 {
560 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
561 exit(1);
562 }
563 /* Bump up the qlen to deal with bursts from the network */
564 ifr.ifr_qlen = 1000;
565 if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
566 {
567 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
568 exit(1);
569 }
570 /* set MTU to modem MRU */
571 ifr.ifr_mtu = MRU;
572 if (ioctl(ifrfd, SIOCSIFMTU, (void *) &ifr) < 0)
573 {
574 LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno));
575 exit(1);
576 }
577 ifr.ifr_flags = IFF_UP;
578 if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
579 {
580 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
581 exit(1);
582 }
583 if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
584 {
585 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
586 exit(1);
587 }
588 tunidx = ifr.ifr_ifindex;
589
590 // Only setup IPv6 on the tun device if we have a configured prefix
591 if (config->ipv6_prefix.s6_addr[0]) {
592 ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
593
594 // Link local address is FE80::1
595 memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
596 ifr6.ifr6_addr.s6_addr[0] = 0xFE;
597 ifr6.ifr6_addr.s6_addr[1] = 0x80;
598 ifr6.ifr6_addr.s6_addr[15] = 1;
599 ifr6.ifr6_prefixlen = 64;
600 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
601 if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
602 {
603 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
604 " %s\n", strerror(errno));
605 }
606
607 // Global address is prefix::1
608 memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
609 ifr6.ifr6_addr = config->ipv6_prefix;
610 ifr6.ifr6_addr.s6_addr[15] = 1;
611 ifr6.ifr6_prefixlen = 64;
612 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
613 if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
614 {
615 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
616 strerror(errno));
617 }
618 }
619 }
620
621 // set up UDP ports
622 static void initudp(void)
623 {
624 int on = 1;
625 struct sockaddr_in addr;
626
627 // Tunnel
628 memset(&addr, 0, sizeof(addr));
629 addr.sin_family = AF_INET;
630 addr.sin_port = htons(L2TPPORT);
631 addr.sin_addr.s_addr = config->bind_address;
632 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
633 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
634 {
635 int flags = fcntl(udpfd, F_GETFL, 0);
636 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
637 }
638 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
639 {
640 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
641 exit(1);
642 }
643
644 // Control
645 memset(&addr, 0, sizeof(addr));
646 addr.sin_family = AF_INET;
647 addr.sin_port = htons(NSCTL_PORT);
648 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
649 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
650 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
651 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
652 {
653 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
654 exit(1);
655 }
656
657 // Dynamic Authorization Extensions to RADIUS
658 memset(&addr, 0, sizeof(addr));
659 addr.sin_family = AF_INET;
660 addr.sin_port = htons(config->radius_dae_port);
661 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
662 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
663 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
664 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
665 {
666 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
667 exit(1);
668 }
669
670 // Intercept
671 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
672 }
673
674 //
675 // Find session by IP, < 1 for not found
676 //
677 // Confusingly enough, this 'ip' must be
678 // in _network_ order. This being the common
679 // case when looking it up from IP packet headers.
680 //
681 // We actually use this cache for two things.
682 // #1. For used IP addresses, this maps to the
683 // session ID that it's used by.
684 // #2. For un-used IP addresses, this maps to the
685 // index into the pool table that contains that
686 // IP address.
687 //
688
689 static sessionidt lookup_ipmap(in_addr_t ip)
690 {
691 uint8_t *a = (uint8_t *) &ip;
692 union iphash *h = ip_hash;
693
694 if (!(h = h[*a++].idx)) return 0;
695 if (!(h = h[*a++].idx)) return 0;
696 if (!(h = h[*a++].idx)) return 0;
697
698 return h[*a].sess;
699 }
700
701 static sessionidt lookup_ipv6map(struct in6_addr ip)
702 {
703 struct ipv6radix *curnode;
704 int i;
705 int s;
706 char ipv6addr[INET6_ADDRSTRLEN];
707
708 curnode = &ipv6_hash[ip.s6_addr[0]];
709 i = 1;
710 s = curnode->sess;
711
712 while (s == 0 && i < 15 && curnode->branch != NULL)
713 {
714 curnode = &curnode->branch[ip.s6_addr[i]];
715 s = curnode->sess;
716 i++;
717 }
718
719 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
720 inet_ntop(AF_INET6, &ip, ipv6addr,
721 INET6_ADDRSTRLEN),
722 s);
723
724 return s;
725 }
726
727 sessionidt sessionbyip(in_addr_t ip)
728 {
729 sessionidt s = lookup_ipmap(ip);
730 CSTAT(sessionbyip);
731
732 if (s > 0 && s < MAXSESSION && session[s].opened)
733 return s;
734
735 return 0;
736 }
737
738 sessionidt sessionbyipv6(struct in6_addr ip)
739 {
740 sessionidt s;
741 CSTAT(sessionbyipv6);
742
743 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
744 (ip.s6_addr[0] == 0xFE &&
745 ip.s6_addr[1] == 0x80 &&
746 ip.s6_addr16[1] == 0 &&
747 ip.s6_addr16[2] == 0 &&
748 ip.s6_addr16[3] == 0)) {
749 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
750 } else {
751 s = lookup_ipv6map(ip);
752 }
753
754 if (s > 0 && s < MAXSESSION && session[s].opened)
755 return s;
756
757 return 0;
758 }
759
760 //
761 // Take an IP address in HOST byte order and
762 // add it to the sessionid by IP cache.
763 //
764 // (It's actually cached in network order)
765 //
766 static void cache_ipmap(in_addr_t ip, sessionidt s)
767 {
768 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
769 uint8_t *a = (uint8_t *) &nip;
770 union iphash *h = ip_hash;
771 int i;
772
773 for (i = 0; i < 3; i++)
774 {
775 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
776 return;
777
778 h = h[a[i]].idx;
779 }
780
781 h[a[3]].sess = s;
782
783 if (s > 0)
784 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
785
786 else if (s == 0)
787 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
788 // else a map to an ip pool index.
789 }
790
791 static void uncache_ipmap(in_addr_t ip)
792 {
793 cache_ipmap(ip, 0); // Assign it to the NULL session.
794 }
795
796 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
797 {
798 int i;
799 int bytes;
800 struct ipv6radix *curnode;
801 char ipv6addr[INET6_ADDRSTRLEN];
802
803 curnode = &ipv6_hash[ip.s6_addr[0]];
804
805 bytes = prefixlen >> 3;
806 i = 1;
807 while (i < bytes) {
808 if (curnode->branch == NULL)
809 {
810 if (!(curnode->branch = calloc(256,
811 sizeof (struct ipv6radix))))
812 return;
813 }
814 curnode = &curnode->branch[ip.s6_addr[i]];
815 i++;
816 }
817
818 curnode->sess = s;
819
820 if (s > 0)
821 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
822 inet_ntop(AF_INET6, &ip, ipv6addr,
823 INET6_ADDRSTRLEN),
824 prefixlen);
825 else if (s == 0)
826 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
827 inet_ntop(AF_INET6, &ip, ipv6addr,
828 INET6_ADDRSTRLEN),
829 prefixlen);
830 }
831
832 //
833 // CLI list to dump current ipcache.
834 //
835 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
836 {
837 union iphash *d = ip_hash, *e, *f, *g;
838 int i, j, k, l;
839 int count = 0;
840
841 if (CLI_HELP_REQUESTED)
842 return CLI_HELP_NO_ARGS;
843
844 cli_print(cli, "%7s %s", "Sess#", "IP Address");
845
846 for (i = 0; i < 256; ++i)
847 {
848 if (!d[i].idx)
849 continue;
850
851 e = d[i].idx;
852 for (j = 0; j < 256; ++j)
853 {
854 if (!e[j].idx)
855 continue;
856
857 f = e[j].idx;
858 for (k = 0; k < 256; ++k)
859 {
860 if (!f[k].idx)
861 continue;
862
863 g = f[k].idx;
864 for (l = 0; l < 256; ++l)
865 {
866 if (!g[l].sess)
867 continue;
868
869 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
870 ++count;
871 }
872 }
873 }
874 }
875 cli_print(cli, "%d entries in cache", count);
876 return CLI_OK;
877 }
878
879
880 // Find session by username, 0 for not found
881 // walled garden users aren't authenticated, so the username is
882 // reasonably useless. Ignore them to avoid incorrect actions
883 //
884 // This is VERY inefficent. Don't call it often. :)
885 //
886 sessionidt sessionbyuser(char *username)
887 {
888 int s;
889 CSTAT(sessionbyuser);
890
891 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
892 {
893 if (!session[s].opened)
894 continue;
895
896 if (session[s].walled_garden)
897 continue; // Skip walled garden users.
898
899 if (!strncmp(session[s].user, username, 128))
900 return s;
901
902 }
903 return 0; // Not found.
904 }
905
906 void send_garp(in_addr_t ip)
907 {
908 int s;
909 struct ifreq ifr;
910 uint8_t mac[6];
911
912 s = socket(PF_INET, SOCK_DGRAM, 0);
913 if (s < 0)
914 {
915 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
916 return;
917 }
918 memset(&ifr, 0, sizeof(ifr));
919 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
920 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
921 {
922 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
923 close(s);
924 return;
925 }
926 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
927 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
928 {
929 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
930 close(s);
931 return;
932 }
933 close(s);
934 sendarp(ifr.ifr_ifindex, mac, ip);
935 }
936
937 static sessiont *sessiontbysessionidt(sessionidt s)
938 {
939 if (!s || s >= MAXSESSION) return NULL;
940 return &session[s];
941 }
942
943 static sessionidt sessionidtbysessiont(sessiont *s)
944 {
945 sessionidt val = s-session;
946 if (s < session || val >= MAXSESSION) return 0;
947 return val;
948 }
949
950 // actually send a control message for a specific tunnel
951 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
952 {
953 struct sockaddr_in addr;
954
955 CSTAT(tunnelsend);
956
957 if (!t)
958 {
959 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
960 STAT(tunnel_tx_errors);
961 return;
962 }
963
964 if (!tunnel[t].ip)
965 {
966 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
967 STAT(tunnel_tx_errors);
968 return;
969 }
970
971 memset(&addr, 0, sizeof(addr));
972 addr.sin_family = AF_INET;
973 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
974 addr.sin_port = htons(tunnel[t].port);
975
976 // sequence expected, if sequence in message
977 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
978
979 // If this is a control message, deal with retries
980 if (*buf & 0x80)
981 {
982 tunnel[t].last = time_now; // control message sent
983 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
984 if (tunnel[t].try)
985 {
986 STAT(tunnel_retries);
987 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
988 }
989 }
990
991 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
992 {
993 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
994 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
995 STAT(tunnel_tx_errors);
996 return;
997 }
998
999 LOG_HEX(5, "Send Tunnel Data", buf, l);
1000 STAT(tunnel_tx_packets);
1001 INC_STAT(tunnel_tx_bytes, l);
1002 }
1003
1004 //
1005 // Tiny helper function to write data to
1006 // the 'tun' device.
1007 //
1008 int tun_write(uint8_t * data, int size)
1009 {
1010 return write(tunfd, data, size);
1011 }
1012
1013 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1014 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1015 {
1016 int d = (tcp[12] >> 4) * 4;
1017 uint8_t *mss = 0;
1018 uint8_t *opts;
1019 uint8_t *data;
1020 uint16_t orig;
1021 uint32_t sum;
1022
1023 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1024 return;
1025
1026 if (tcp + d > buf + len) // short?
1027 return;
1028
1029 opts = tcp + 20;
1030 data = tcp + d;
1031
1032 while (opts < data)
1033 {
1034 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1035 {
1036 mss = opts + 2;
1037 if (mss + 2 > data) return; // short?
1038 break;
1039 }
1040
1041 if (*opts == 0) return; // end of options
1042 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1043 opts++;
1044 else
1045 opts += opts[1]; // skip over option
1046 }
1047
1048 if (!mss) return; // not found
1049 orig = ntohs(*(uint16_t *) mss);
1050
1051 if (orig <= MSS) return; // mss OK
1052
1053 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1054 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1055 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1056 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1057
1058 // set mss
1059 *(int16_t *) mss = htons(MSS);
1060
1061 // adjust checksum (see rfc1141)
1062 sum = orig + (~MSS & 0xffff);
1063 sum += ntohs(*(uint16_t *) (tcp + 16));
1064 sum = (sum & 0xffff) + (sum >> 16);
1065 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1066 }
1067
1068 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1069 {
1070 uint16_t proto;
1071 if (extra) {
1072 // Skip the four extra bytes
1073 p += 4;
1074 l -= 4;
1075 }
1076
1077 if (*p & 1)
1078 {
1079 proto = *p++;
1080 l--;
1081 }
1082 else
1083 {
1084 proto = ntohs(*(uint16_t *) p);
1085 p += 2;
1086 l -= 2;
1087 }
1088 if (proto == PPPIP)
1089 {
1090 if (session[s].die)
1091 {
1092 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1093 return; // closing session, PPP not processed
1094 }
1095 session[s].last_packet = session[s].last_data = time_now;
1096 processipin(s, t, p, l);
1097 }
1098 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1099 {
1100 if (session[s].die)
1101 {
1102 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1103 return; // closing session, PPP not processed
1104 }
1105
1106 session[s].last_packet = session[s].last_data = time_now;
1107 processipv6in(s, t, p, l);
1108 }
1109 else if (proto == PPPIPCP)
1110 {
1111 session[s].last_packet = session[s].last_data = time_now;
1112 processipcp(s, t, p, l);
1113 }
1114 else if (proto == PPPCCP)
1115 {
1116 session[s].last_packet = session[s].last_data = time_now;
1117 processccp(s, t, p, l);
1118 }
1119 else
1120 {
1121 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1122 }
1123 }
1124
1125 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1126 {
1127 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1128 sp->cout_delta += len;
1129 sp->pout++;
1130 sp->last_data = time_now;
1131
1132 sess_local[s].cout += len; // To send to master..
1133 sess_local[s].pout++;
1134 }
1135
1136 // process outgoing (to tunnel) IP
1137 //
1138 static void processipout(uint8_t *buf, int len)
1139 {
1140 sessionidt s;
1141 sessiont *sp;
1142 tunnelidt t;
1143 in_addr_t ip;
1144
1145 uint8_t *data = buf; // Keep a copy of the originals.
1146 int size = len;
1147
1148 uint8_t fragbuf[MAXETHER + 20];
1149
1150 CSTAT(processipout);
1151
1152 if (len < MIN_IP_SIZE)
1153 {
1154 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1155 STAT(tun_rx_errors);
1156 return;
1157 }
1158 if (len >= MAXETHER)
1159 {
1160 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1161 STAT(tun_rx_errors);
1162 return;
1163 }
1164
1165 // Skip the tun header
1166 buf += 4;
1167 len -= 4;
1168
1169 // Got an IP header now
1170 if (*(uint8_t *)(buf) >> 4 != 4)
1171 {
1172 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1173 return;
1174 }
1175
1176 ip = *(uint32_t *)(buf + 16);
1177 if (!(s = sessionbyip(ip)))
1178 {
1179 // Is this a packet for a session that doesn't exist?
1180 static int rate = 0; // Number of ICMP packets we've sent this second.
1181 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1182
1183 if (last != time_now)
1184 {
1185 last = time_now;
1186 rate = 0;
1187 }
1188
1189 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1190 {
1191 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1192 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1193 config->bind_address ? config->bind_address : my_address, buf, len);
1194 }
1195 return;
1196 }
1197
1198 t = session[s].tunnel;
1199 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1200 {
1201 LOG(3, s, t, "Packet size more than session MRU\n");
1202 return;
1203 }
1204
1205 sp = &session[s];
1206
1207 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1208 if (config->max_packets > 0)
1209 {
1210 if (sess_local[s].last_packet_out == TIME)
1211 {
1212 int max = config->max_packets;
1213
1214 // All packets for throttled sessions are handled by the
1215 // master, so further limit by using the throttle rate.
1216 // A bit of a kludge, since throttle rate is in kbps,
1217 // but should still be generous given our average DSL
1218 // packet size is 200 bytes: a limit of 28kbps equates
1219 // to around 180 packets per second.
1220 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1221 max = sp->throttle_out;
1222
1223 if (++sess_local[s].packets_out > max)
1224 {
1225 sess_local[s].packets_dropped++;
1226 return;
1227 }
1228 }
1229 else
1230 {
1231 if (sess_local[s].packets_dropped)
1232 {
1233 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1234 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1235 sess_local[s].packets_dropped, sess_local[s].packets_out,
1236 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1237 sp->user);
1238 }
1239
1240 sess_local[s].last_packet_out = TIME;
1241 sess_local[s].packets_out = 1;
1242 sess_local[s].packets_dropped = 0;
1243 }
1244 }
1245
1246 // run access-list if any
1247 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1248 return;
1249
1250 // adjust MSS on SYN and SYN,ACK packets with options
1251 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1252 {
1253 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1254 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1255 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1256 }
1257
1258 if (sp->tbf_out)
1259 {
1260 // Are we throttling this session?
1261 if (config->cluster_iam_master)
1262 tbf_queue_packet(sp->tbf_out, data, size);
1263 else
1264 master_throttle_packet(sp->tbf_out, data, size);
1265 return;
1266 }
1267
1268 if (sp->walled_garden && !config->cluster_iam_master)
1269 {
1270 // We are walled-gardening this
1271 master_garden_packet(s, data, size);
1272 return;
1273 }
1274
1275 // Add on L2TP header
1276 {
1277 bundleidt bid = 0;
1278 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1279 {
1280 bid = session[s].bundle;
1281 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1282 t = session[s].tunnel;
1283 sp = &session[s];
1284 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1285 if(len > MINFRAGLEN)
1286 {
1287 // Partition the packet to "bundle[b].num_of_links" fragments
1288 bundlet *b = &bundle[bid];
1289 uint32_t num_of_links = b->num_of_links;
1290 uint32_t fraglen = len / num_of_links;
1291 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1292 uint32_t last_fraglen = fraglen + len % num_of_links;
1293 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1294 uint32_t remain = len;
1295
1296 // send the first packet
1297 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1298 if (!p) return;
1299 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1300 // statistics
1301 update_session_out_stat(s, sp, fraglen);
1302 remain -= fraglen;
1303 while (remain > last_fraglen)
1304 {
1305 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1306 t = session[s].tunnel;
1307 sp = &session[s];
1308 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1309 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1310 if (!p) return;
1311 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1312 update_session_out_stat(s, sp, fraglen);
1313 remain -= fraglen;
1314 }
1315 // send the last fragment
1316 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1317 t = session[s].tunnel;
1318 sp = &session[s];
1319 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1320 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1321 if (!p) return;
1322 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1323 update_session_out_stat(s, sp, remain);
1324 if (remain != last_fraglen)
1325 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1326 }
1327 else {
1328 // Send it as one frame
1329 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1330 if (!p) return;
1331 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1332 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1333 update_session_out_stat(s, sp, len);
1334 }
1335 }
1336 else
1337 {
1338 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1339 if (!p) return;
1340 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1341 update_session_out_stat(s, sp, len);
1342 }
1343 }
1344
1345 // Snooping this session, send it to intercept box
1346 if (sp->snoop_ip && sp->snoop_port)
1347 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1348
1349 udp_tx += len;
1350 }
1351
1352 // process outgoing (to tunnel) IPv6
1353 //
1354 static void processipv6out(uint8_t * buf, int len)
1355 {
1356 sessionidt s;
1357 sessiont *sp;
1358 tunnelidt t;
1359 in_addr_t ip;
1360 struct in6_addr ip6;
1361
1362 uint8_t *data = buf; // Keep a copy of the originals.
1363 int size = len;
1364
1365 uint8_t b[MAXETHER + 20];
1366
1367 CSTAT(processipv6out);
1368
1369 if (len < MIN_IP_SIZE)
1370 {
1371 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1372 STAT(tunnel_tx_errors);
1373 return;
1374 }
1375 if (len >= MAXETHER)
1376 {
1377 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1378 STAT(tunnel_tx_errors);
1379 return;
1380 }
1381
1382 // Skip the tun header
1383 buf += 4;
1384 len -= 4;
1385
1386 // Got an IP header now
1387 if (*(uint8_t *)(buf) >> 4 != 6)
1388 {
1389 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1390 return;
1391 }
1392
1393 ip6 = *(struct in6_addr *)(buf+24);
1394 s = sessionbyipv6(ip6);
1395
1396 if (s == 0)
1397 {
1398 ip = *(uint32_t *)(buf + 32);
1399 s = sessionbyip(ip);
1400 }
1401
1402 if (s == 0)
1403 {
1404 // Is this a packet for a session that doesn't exist?
1405 static int rate = 0; // Number of ICMP packets we've sent this second.
1406 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1407
1408 if (last != time_now)
1409 {
1410 last = time_now;
1411 rate = 0;
1412 }
1413
1414 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1415 {
1416 // FIXME: Should send icmp6 host unreachable
1417 }
1418 return;
1419 }
1420 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1421 {
1422 bundleidt bid = session[s].bundle;
1423 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1424 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1425 }
1426 t = session[s].tunnel;
1427 sp = &session[s];
1428 sp->last_data = time_now;
1429
1430 // FIXME: add DoS prevention/filters?
1431
1432 if (sp->tbf_out)
1433 {
1434 // Are we throttling this session?
1435 if (config->cluster_iam_master)
1436 tbf_queue_packet(sp->tbf_out, data, size);
1437 else
1438 master_throttle_packet(sp->tbf_out, data, size);
1439 return;
1440 }
1441 else if (sp->walled_garden && !config->cluster_iam_master)
1442 {
1443 // We are walled-gardening this
1444 master_garden_packet(s, data, size);
1445 return;
1446 }
1447
1448 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1449
1450 // Add on L2TP header
1451 {
1452 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1453 if (!p) return;
1454 tunnelsend(b, len + (p-b), t); // send it...
1455 }
1456
1457 // Snooping this session, send it to intercept box
1458 if (sp->snoop_ip && sp->snoop_port)
1459 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1460
1461 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1462 sp->cout_delta += len;
1463 sp->pout++;
1464 udp_tx += len;
1465
1466 sess_local[s].cout += len; // To send to master..
1467 sess_local[s].pout++;
1468 }
1469
1470 //
1471 // Helper routine for the TBF filters.
1472 // Used to send queued data in to the user!
1473 //
1474 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1475 {
1476 sessiont *sp;
1477 tunnelidt t;
1478 in_addr_t ip;
1479
1480 uint8_t b[MAXETHER + 20];
1481
1482 if (len < 0 || len > MAXETHER)
1483 {
1484 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1485 return;
1486 }
1487
1488 // Skip the tun header
1489 buf += 4;
1490 len -= 4;
1491
1492 ip = *(in_addr_t *)(buf + 16);
1493
1494 if (!session[s].ip)
1495 return;
1496
1497 t = session[s].tunnel;
1498 sp = &session[s];
1499
1500 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1501
1502 // Add on L2TP header
1503 {
1504 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1505 if (!p) return;
1506 tunnelsend(b, len + (p-b), t); // send it...
1507 }
1508
1509 // Snooping this session.
1510 if (sp->snoop_ip && sp->snoop_port)
1511 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1512
1513 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1514 sp->cout_delta += len;
1515 sp->pout++;
1516 udp_tx += len;
1517
1518 sess_local[s].cout += len; // To send to master..
1519 sess_local[s].pout++;
1520 }
1521
1522 // add an AVP (16 bit)
1523 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1524 {
1525 uint16_t l = (m ? 0x8008 : 0x0008);
1526 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1527 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1528 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1529 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1530 c->length += 8;
1531 }
1532
1533 // add an AVP (32 bit)
1534 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1535 {
1536 uint16_t l = (m ? 0x800A : 0x000A);
1537 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1538 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1539 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1540 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1541 c->length += 10;
1542 }
1543
1544 // add an AVP (string)
1545 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1546 {
1547 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1548 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1549 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1550 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1551 memcpy(c->buf + c->length + 6, val, strlen(val));
1552 c->length += 6 + strlen(val);
1553 }
1554
1555 // add a binary AVP
1556 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1557 {
1558 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1559 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1560 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1561 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1562 memcpy(c->buf + c->length + 6, val, len);
1563 c->length += 6 + len;
1564 }
1565
1566 // new control connection
1567 static controlt *controlnew(uint16_t mtype)
1568 {
1569 controlt *c;
1570 if (!controlfree)
1571 c = malloc(sizeof(controlt));
1572 else
1573 {
1574 c = controlfree;
1575 controlfree = c->next;
1576 }
1577 assert(c);
1578 c->next = 0;
1579 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1580 c->length = 12;
1581 control16(c, 0, mtype, 1);
1582 return c;
1583 }
1584
1585 // send zero block if nothing is waiting
1586 // (ZLB send).
1587 static void controlnull(tunnelidt t)
1588 {
1589 uint8_t buf[12];
1590 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1591 return;
1592
1593 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1594 *(uint16_t *) (buf + 2) = htons(12); // length
1595 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1596 *(uint16_t *) (buf + 6) = htons(0); // session
1597 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1598 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1599 tunnelsend(buf, 12, t);
1600 }
1601
1602 // add a control message to a tunnel, and send if within window
1603 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1604 {
1605 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1606 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1607 *(uint16_t *) (c->buf + 6) = htons(far); // session
1608 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1609 tunnel[t].ns++; // advance sequence
1610 // link in message in to queue
1611 if (tunnel[t].controlc)
1612 tunnel[t].controle->next = c;
1613 else
1614 tunnel[t].controls = c;
1615
1616 tunnel[t].controle = c;
1617 tunnel[t].controlc++;
1618
1619 // send now if space in window
1620 if (tunnel[t].controlc <= tunnel[t].window)
1621 {
1622 tunnel[t].try = 0; // first send
1623 tunnelsend(c->buf, c->length, t);
1624 }
1625 }
1626
1627 //
1628 // Throttle or Unthrottle a session
1629 //
1630 // Throttle the data from/to through a session to no more than
1631 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1632 // user).
1633 //
1634 // If either value is -1, the current value is retained for that
1635 // direction.
1636 //
1637 void throttle_session(sessionidt s, int rate_in, int rate_out)
1638 {
1639 if (!session[s].opened)
1640 return; // No-one home.
1641
1642 if (!*session[s].user)
1643 return; // User not logged in
1644
1645 if (rate_in >= 0)
1646 {
1647 int bytes = rate_in * 1024 / 8; // kbits to bytes
1648 if (session[s].tbf_in)
1649 free_tbf(session[s].tbf_in);
1650
1651 if (rate_in > 0)
1652 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1653 else
1654 session[s].tbf_in = 0;
1655
1656 session[s].throttle_in = rate_in;
1657 }
1658
1659 if (rate_out >= 0)
1660 {
1661 int bytes = rate_out * 1024 / 8;
1662 if (session[s].tbf_out)
1663 free_tbf(session[s].tbf_out);
1664
1665 if (rate_out > 0)
1666 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1667 else
1668 session[s].tbf_out = 0;
1669
1670 session[s].throttle_out = rate_out;
1671 }
1672 }
1673
1674 // add/remove filters from session (-1 = no change)
1675 void filter_session(sessionidt s, int filter_in, int filter_out)
1676 {
1677 if (!session[s].opened)
1678 return; // No-one home.
1679
1680 if (!*session[s].user)
1681 return; // User not logged in
1682
1683 // paranoia
1684 if (filter_in > MAXFILTER) filter_in = -1;
1685 if (filter_out > MAXFILTER) filter_out = -1;
1686 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1687 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1688
1689 if (filter_in >= 0)
1690 {
1691 if (session[s].filter_in)
1692 ip_filters[session[s].filter_in - 1].used--;
1693
1694 if (filter_in > 0)
1695 ip_filters[filter_in - 1].used++;
1696
1697 session[s].filter_in = filter_in;
1698 }
1699
1700 if (filter_out >= 0)
1701 {
1702 if (session[s].filter_out)
1703 ip_filters[session[s].filter_out - 1].used--;
1704
1705 if (filter_out > 0)
1706 ip_filters[filter_out - 1].used++;
1707
1708 session[s].filter_out = filter_out;
1709 }
1710 }
1711
1712 // start tidy shutdown of session
1713 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1714 {
1715 int walled_garden = session[s].walled_garden;
1716 bundleidt b = session[s].bundle;
1717 //delete routes only for last session in bundle (in case of MPPP)
1718 int del_routes = !b || (bundle[b].num_of_links == 1);
1719
1720 CSTAT(sessionshutdown);
1721
1722 if (!session[s].opened)
1723 {
1724 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1725 return; // not a live session
1726 }
1727
1728 if (!session[s].die)
1729 {
1730 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1731 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1732 run_plugins(PLUGIN_KILL_SESSION, &data);
1733 }
1734
1735 if (session[s].ip && !walled_garden && !session[s].die)
1736 {
1737 // RADIUS Stop message
1738 uint16_t r = radiusnew(s);
1739 if (r)
1740 {
1741 // stop, if not already trying
1742 if (radius[r].state != RADIUSSTOP)
1743 {
1744 radius[r].term_cause = term_cause;
1745 radius[r].term_msg = reason;
1746 radiussend(r, RADIUSSTOP);
1747 }
1748 }
1749 else
1750 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1751
1752 // Save counters to dump to accounting file
1753 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1754 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1755 }
1756
1757 if (session[s].ip)
1758 { // IP allocated, clear and unroute
1759 int r;
1760 int routed = 0;
1761 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1762 {
1763 if ((session[s].ip & session[s].route[r].mask) ==
1764 (session[s].route[r].ip & session[s].route[r].mask))
1765 routed++;
1766
1767 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
1768 session[s].route[r].ip = 0;
1769 }
1770
1771 if (session[s].ip_pool_index == -1) // static ip
1772 {
1773 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1774 session[s].ip = 0;
1775 }
1776 else
1777 free_ip_address(s);
1778
1779 // unroute IPv6, if setup
1780 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1781 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1782
1783 if (b)
1784 {
1785 // This session was part of a bundle
1786 bundle[b].num_of_links--;
1787 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1788 if(bundle[b].num_of_links == 0)
1789 {
1790 bundleclear(b);
1791 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1792 }
1793 else
1794 {
1795 // Adjust the members array to accomodate the new change
1796 uint8_t mem_num = 0;
1797 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1798 if(bundle[b].members[bundle[b].num_of_links] != s)
1799 {
1800 uint8_t ml;
1801 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1802 if(bundle[b].members[ml] == s)
1803 {
1804 mem_num = ml;
1805 break;
1806 }
1807 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1808 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
1809 }
1810 }
1811 cluster_send_bundle(b);
1812 }
1813 }
1814
1815 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
1816 throttle_session(s, 0, 0);
1817
1818 if (cdn_result)
1819 { // Send CDN
1820 controlt *c = controlnew(14); // sending CDN
1821 if (cdn_error)
1822 {
1823 uint8_t buf[4];
1824 *(uint16_t *) buf = htons(cdn_result);
1825 *(uint16_t *) (buf+2) = htons(cdn_error);
1826 controlb(c, 1, buf, 4, 1);
1827 }
1828 else
1829 control16(c, 1, cdn_result, 1);
1830
1831 control16(c, 14, s, 1); // assigned session (our end)
1832 controladd(c, session[s].far, session[s].tunnel); // send the message
1833 }
1834
1835 if (!session[s].die)
1836 session[s].die = TIME + 150; // Clean up in 15 seconds
1837
1838 // update filter refcounts
1839 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
1840 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
1841
1842 // clear PPP state
1843 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
1844 sess_local[s].lcp.restart = 0;
1845 sess_local[s].ipcp.restart = 0;
1846 sess_local[s].ipv6cp.restart = 0;
1847 sess_local[s].ccp.restart = 0;
1848
1849 cluster_send_session(s);
1850 }
1851
1852 void sendipcp(sessionidt s, tunnelidt t)
1853 {
1854 uint8_t buf[MAXETHER];
1855 uint8_t *q;
1856
1857 CSTAT(sendipcp);
1858 LOG(3, s, t, "IPCP: send ConfigReq\n");
1859
1860 if (!session[s].unique_id)
1861 {
1862 if (!++last_id) ++last_id; // skip zero
1863 session[s].unique_id = last_id;
1864 }
1865
1866 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
1867 if (!q) return;
1868
1869 *q = ConfigReq;
1870 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
1871 *(uint16_t *) (q + 2) = htons(10); // packet length
1872 q[4] = 3; // ip address option
1873 q[5] = 6; // option length
1874 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
1875 config->bind_address ? config->bind_address :
1876 my_address; // send my IP
1877
1878 tunnelsend(buf, 10 + (q - buf), t); // send it
1879 restart_timer(s, ipcp);
1880 }
1881
1882 void sendipv6cp(sessionidt s, tunnelidt t)
1883 {
1884 uint8_t buf[MAXETHER];
1885 uint8_t *q;
1886
1887 CSTAT(sendipv6cp);
1888 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
1889
1890 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
1891 if (!q) return;
1892
1893 *q = ConfigReq;
1894 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
1895 // only send one type
1896 // of request
1897 *(uint16_t *) (q + 2) = htons(14);
1898 q[4] = 1; // interface identifier option
1899 q[5] = 10; // option length
1900 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
1901 *(uint32_t *) (q + 10) = 0;
1902 q[13] = 1;
1903
1904 tunnelsend(buf, 14 + (q - buf), t); // send it
1905 restart_timer(s, ipv6cp);
1906 }
1907
1908 static void sessionclear(sessionidt s)
1909 {
1910 memset(&session[s], 0, sizeof(session[s]));
1911 memset(&sess_local[s], 0, sizeof(sess_local[s]));
1912 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
1913
1914 session[s].tunnel = T_FREE; // Mark it as free.
1915 session[s].next = sessionfree;
1916 sessionfree = s;
1917 }
1918
1919 // kill a session now
1920 void sessionkill(sessionidt s, char *reason)
1921 {
1922 CSTAT(sessionkill);
1923
1924 if (!session[s].opened) // not alive
1925 return;
1926
1927 if (session[s].next)
1928 {
1929 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
1930 return;
1931 }
1932
1933 session[s].die = TIME;
1934 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
1935 if (sess_local[s].radius)
1936 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
1937
1938 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
1939 sessionclear(s);
1940 cluster_send_session(s);
1941 }
1942
1943 static void tunnelclear(tunnelidt t)
1944 {
1945 if (!t) return;
1946 memset(&tunnel[t], 0, sizeof(tunnel[t]));
1947 tunnel[t].state = TUNNELFREE;
1948 }
1949
1950 static void bundleclear(bundleidt b)
1951 {
1952 if (!b) return;
1953 memset(&bundle[b], 0, sizeof(bundle[b]));
1954 bundle[b].state = BUNDLEFREE;
1955 }
1956
1957 // kill a tunnel now
1958 static void tunnelkill(tunnelidt t, char *reason)
1959 {
1960 sessionidt s;
1961 controlt *c;
1962
1963 CSTAT(tunnelkill);
1964
1965 tunnel[t].state = TUNNELDIE;
1966
1967 // free control messages
1968 while ((c = tunnel[t].controls))
1969 {
1970 controlt * n = c->next;
1971 tunnel[t].controls = n;
1972 tunnel[t].controlc--;
1973 c->next = controlfree;
1974 controlfree = c;
1975 }
1976 // kill sessions
1977 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1978 if (session[s].tunnel == t)
1979 sessionkill(s, reason);
1980
1981 // free tunnel
1982 tunnelclear(t);
1983 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
1984 cli_tunnel_actions[t].action = 0;
1985 cluster_send_tunnel(t);
1986 }
1987
1988 // shut down a tunnel cleanly
1989 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
1990 {
1991 sessionidt s;
1992
1993 CSTAT(tunnelshutdown);
1994
1995 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
1996 {
1997 // never set up, can immediately kill
1998 tunnelkill(t, reason);
1999 return;
2000 }
2001 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2002
2003 // close session
2004 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2005 if (session[s].tunnel == t)
2006 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2007
2008 tunnel[t].state = TUNNELDIE;
2009 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2010 cluster_send_tunnel(t);
2011 // TBA - should we wait for sessions to stop?
2012 if (result)
2013 {
2014 controlt *c = controlnew(4); // sending StopCCN
2015 if (error)
2016 {
2017 uint8_t buf[64];
2018 int l = 4;
2019 *(uint16_t *) buf = htons(result);
2020 *(uint16_t *) (buf+2) = htons(error);
2021 if (msg)
2022 {
2023 int m = strlen(msg);
2024 if (m + 4 > sizeof(buf))
2025 m = sizeof(buf) - 4;
2026
2027 memcpy(buf+4, msg, m);
2028 l += m;
2029 }
2030
2031 controlb(c, 1, buf, l, 1);
2032 }
2033 else
2034 control16(c, 1, result, 1);
2035
2036 control16(c, 9, t, 1); // assigned tunnel (our end)
2037 controladd(c, 0, t); // send the message
2038 }
2039 }
2040
2041 // read and process packet on tunnel (UDP)
2042 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2043 {
2044 uint8_t *chapresponse = NULL;
2045 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2046 uint8_t *p = buf + 2;
2047
2048
2049 CSTAT(processudp);
2050
2051 udp_rx += len;
2052 udp_rx_pkt++;
2053 LOG_HEX(5, "UDP Data", buf, len);
2054 STAT(tunnel_rx_packets);
2055 INC_STAT(tunnel_rx_bytes, len);
2056 if (len < 6)
2057 {
2058 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2059 STAT(tunnel_rx_errors);
2060 return;
2061 }
2062 if ((buf[1] & 0x0F) != 2)
2063 {
2064 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2065 STAT(tunnel_rx_errors);
2066 return;
2067 }
2068 if (*buf & 0x40)
2069 { // length
2070 l = ntohs(*(uint16_t *) p);
2071 p += 2;
2072 }
2073 t = ntohs(*(uint16_t *) p);
2074 p += 2;
2075 s = ntohs(*(uint16_t *) p);
2076 p += 2;
2077 if (s >= MAXSESSION)
2078 {
2079 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2080 STAT(tunnel_rx_errors);
2081 return;
2082 }
2083 if (t >= MAXTUNNEL)
2084 {
2085 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2086 STAT(tunnel_rx_errors);
2087 return;
2088 }
2089 if (*buf & 0x08)
2090 { // ns/nr
2091 ns = ntohs(*(uint16_t *) p);
2092 p += 2;
2093 nr = ntohs(*(uint16_t *) p);
2094 p += 2;
2095 }
2096 if (*buf & 0x02)
2097 { // offset
2098 uint16_t o = ntohs(*(uint16_t *) p);
2099 p += o + 2;
2100 }
2101 if ((p - buf) > l)
2102 {
2103 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2104 STAT(tunnel_rx_errors);
2105 return;
2106 }
2107 l -= (p - buf);
2108
2109 // used to time out old tunnels
2110 if (t && tunnel[t].state == TUNNELOPEN)
2111 tunnel[t].lastrec = time_now;
2112
2113 if (*buf & 0x80)
2114 { // control
2115 uint16_t message = 0xFFFF; // message type
2116 uint8_t fatal = 0;
2117 uint8_t mandatory = 0;
2118 uint16_t asession = 0; // assigned session
2119 uint32_t amagic = 0; // magic number
2120 uint8_t aflags = 0; // flags from last LCF
2121 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2122 char called[MAXTEL] = ""; // called number
2123 char calling[MAXTEL] = ""; // calling number
2124
2125 if (!config->cluster_iam_master)
2126 {
2127 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2128 return;
2129 }
2130
2131 // control messages must have bits 0x80|0x40|0x08
2132 // (type, length and sequence) set, and bits 0x02|0x01
2133 // (offset and priority) clear
2134 if ((*buf & 0xCB) != 0xC8)
2135 {
2136 LOG(1, s, t, "Bad control header %02X\n", *buf);
2137 STAT(tunnel_rx_errors);
2138 return;
2139 }
2140
2141 // check for duplicate tunnel open message
2142 if (!t && ns == 0)
2143 {
2144 int i;
2145
2146 //
2147 // Is this a duplicate of the first packet? (SCCRQ)
2148 //
2149 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2150 {
2151 if (tunnel[i].state != TUNNELOPENING ||
2152 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2153 tunnel[i].port != ntohs(addr->sin_port) )
2154 continue;
2155 t = i;
2156 LOG(3, s, t, "Duplicate SCCRQ?\n");
2157 break;
2158 }
2159 }
2160
2161 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2162 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2163
2164 // if no tunnel specified, assign one
2165 if (!t)
2166 {
2167 if (!(t = new_tunnel()))
2168 {
2169 LOG(1, 0, 0, "No more tunnels\n");
2170 STAT(tunnel_overflow);
2171 return;
2172 }
2173 tunnelclear(t);
2174 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2175 tunnel[t].port = ntohs(addr->sin_port);
2176 tunnel[t].window = 4; // default window
2177 STAT(tunnel_created);
2178 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2179 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2180 }
2181
2182 // If the 'ns' just received is not the 'nr' we're
2183 // expecting, just send an ack and drop it.
2184 //
2185 // if 'ns' is less, then we got a retransmitted packet.
2186 // if 'ns' is greater than missed a packet. Either way
2187 // we should ignore it.
2188 if (ns != tunnel[t].nr)
2189 {
2190 // is this the sequence we were expecting?
2191 STAT(tunnel_rx_errors);
2192 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2193 t, ns, tunnel[t].nr);
2194
2195 if (l) // Is this not a ZLB?
2196 controlnull(t);
2197 return;
2198 }
2199
2200 // check sequence of this message
2201 {
2202 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2203 // some to clear maybe?
2204 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2205 {
2206 controlt *c = tunnel[t].controls;
2207 tunnel[t].controls = c->next;
2208 tunnel[t].controlc--;
2209 c->next = controlfree;
2210 controlfree = c;
2211 skip--;
2212 tunnel[t].try = 0; // we have progress
2213 }
2214
2215 // receiver advance (do here so quoted correctly in any sends below)
2216 if (l) tunnel[t].nr = (ns + 1);
2217 if (skip < 0) skip = 0;
2218 if (skip < tunnel[t].controlc)
2219 {
2220 // some control packets can now be sent that were previous stuck out of window
2221 int tosend = tunnel[t].window - skip;
2222 controlt *c = tunnel[t].controls;
2223 while (c && skip)
2224 {
2225 c = c->next;
2226 skip--;
2227 }
2228 while (c && tosend)
2229 {
2230 tunnel[t].try = 0; // first send
2231 tunnelsend(c->buf, c->length, t);
2232 c = c->next;
2233 tosend--;
2234 }
2235 }
2236 if (!tunnel[t].controlc)
2237 tunnel[t].retry = 0; // caught up
2238 }
2239 if (l)
2240 { // if not a null message
2241 int result = 0;
2242 int error = 0;
2243 char *msg = 0;
2244
2245 // Default disconnect cause/message on receipt of CDN. Set to
2246 // more specific value from attribute 1 (result code) or 46
2247 // (disconnect cause) if present below.
2248 int disc_cause_set = 0;
2249 int disc_cause = TERM_NAS_REQUEST;
2250 char const *disc_reason = "Closed (Received CDN).";
2251
2252 // process AVPs
2253 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2254 {
2255 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2256 uint8_t *b = p;
2257 uint8_t flags = *p;
2258 uint16_t mtype;
2259
2260 if (n > l)
2261 {
2262 LOG(1, s, t, "Invalid length in AVP\n");
2263 STAT(tunnel_rx_errors);
2264 return;
2265 }
2266 p += n; // next
2267 l -= n;
2268 if (flags & 0x3C) // reserved bits, should be clear
2269 {
2270 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2271 fatal = flags;
2272 result = 2; // general error
2273 error = 3; // reserved field non-zero
2274 msg = 0;
2275 continue; // next
2276 }
2277 b += 2;
2278 if (*(uint16_t *) (b))
2279 {
2280 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2281 fatal = flags;
2282 result = 2; // general error
2283 error = 6; // generic vendor-specific error
2284 msg = "unsupported vendor-specific";
2285 continue; // next
2286 }
2287 b += 2;
2288 mtype = ntohs(*(uint16_t *) (b));
2289 b += 2;
2290 n -= 6;
2291
2292 if (flags & 0x40)
2293 {
2294 uint16_t orig_len;
2295
2296 // handle hidden AVPs
2297 if (!*config->l2tp_secret)
2298 {
2299 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2300 fatal = flags;
2301 result = 2; // general error
2302 error = 6; // generic vendor-specific error
2303 msg = "secret not specified";
2304 continue;
2305 }
2306 if (!session[s].random_vector_length)
2307 {
2308 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2309 fatal = flags;
2310 result = 2; // general error
2311 error = 6; // generic
2312 msg = "no random vector";
2313 continue;
2314 }
2315 if (n < 8)
2316 {
2317 LOG(2, s, t, "Short hidden AVP.\n");
2318 fatal = flags;
2319 result = 2; // general error
2320 error = 2; // length is wrong
2321 msg = 0;
2322 continue;
2323 }
2324
2325 // Unhide the AVP
2326 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2327
2328 orig_len = ntohs(*(uint16_t *) b);
2329 if (orig_len > n + 2)
2330 {
2331 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2332 orig_len, n);
2333
2334 fatal = flags;
2335 result = 2; // general error
2336 error = 2; // length is wrong
2337 msg = 0;
2338 continue;
2339 }
2340
2341 b += 2;
2342 n = orig_len;
2343 }
2344
2345 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2346 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2347
2348 switch (mtype)
2349 {
2350 case 0: // message type
2351 message = ntohs(*(uint16_t *) b);
2352 mandatory = flags & 0x80;
2353 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2354 break;
2355 case 1: // result code
2356 {
2357 uint16_t rescode = ntohs(*(uint16_t *) b);
2358 char const *resdesc = "(unknown)";
2359 char const *errdesc = NULL;
2360 int cause = 0;
2361
2362 if (message == 4)
2363 { /* StopCCN */
2364 resdesc = l2tp_stopccn_result_code(rescode);
2365 cause = TERM_LOST_SERVICE;
2366 }
2367 else if (message == 14)
2368 { /* CDN */
2369 resdesc = l2tp_cdn_result_code(rescode);
2370 if (rescode == 1)
2371 cause = TERM_LOST_CARRIER;
2372 else
2373 cause = TERM_ADMIN_RESET;
2374 }
2375
2376 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2377 if (n >= 4)
2378 {
2379 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2380 errdesc = l2tp_error_code(errcode);
2381 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2382 }
2383 if (n > 4)
2384 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2385
2386 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2387 {
2388 disc_cause_set = mtype;
2389 disc_reason = errdesc ? errdesc : resdesc;
2390 disc_cause = cause;
2391 }
2392
2393 break;
2394 }
2395 break;
2396 case 2: // protocol version
2397 {
2398 version = ntohs(*(uint16_t *) (b));
2399 LOG(4, s, t, " Protocol version = %u\n", version);
2400 if (version && version != 0x0100)
2401 { // allow 0.0 and 1.0
2402 LOG(1, s, t, " Bad protocol version %04X\n", version);
2403 fatal = flags;
2404 result = 5; // unspported protocol version
2405 error = 0x0100; // supported version
2406 msg = 0;
2407 continue; // next
2408 }
2409 }
2410 break;
2411 case 3: // framing capabilities
2412 break;
2413 case 4: // bearer capabilities
2414 break;
2415 case 5: // tie breaker
2416 // We never open tunnels, so we don't care about tie breakers
2417 continue;
2418 case 6: // firmware revision
2419 break;
2420 case 7: // host name
2421 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2422 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2423 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2424 // TBA - to send to RADIUS
2425 break;
2426 case 8: // vendor name
2427 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2428 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2429 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2430 break;
2431 case 9: // assigned tunnel
2432 tunnel[t].far = ntohs(*(uint16_t *) (b));
2433 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2434 break;
2435 case 10: // rx window
2436 tunnel[t].window = ntohs(*(uint16_t *) (b));
2437 if (!tunnel[t].window)
2438 tunnel[t].window = 1; // window of 0 is silly
2439 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2440 break;
2441 case 11: // Challenge
2442 {
2443 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2444 build_chap_response(b, 2, n, &chapresponse);
2445 }
2446 break;
2447 case 13: // Response
2448 // Why did they send a response? We never challenge.
2449 LOG(2, s, t, " received unexpected challenge response\n");
2450 break;
2451
2452 case 14: // assigned session
2453 asession = session[s].far = ntohs(*(uint16_t *) (b));
2454 LOG(4, s, t, " assigned session = %u\n", asession);
2455 break;
2456 case 15: // call serial number
2457 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2458 break;
2459 case 18: // bearer type
2460 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2461 // TBA - for RADIUS
2462 break;
2463 case 19: // framing type
2464 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2465 // TBA
2466 break;
2467 case 21: // called number
2468 memset(called, 0, sizeof(called));
2469 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2470 LOG(4, s, t, " Called <%s>\n", called);
2471 break;
2472 case 22: // calling number
2473 memset(calling, 0, sizeof(calling));
2474 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2475 LOG(4, s, t, " Calling <%s>\n", calling);
2476 break;
2477 case 23: // subtype
2478 break;
2479 case 24: // tx connect speed
2480 if (n == 4)
2481 {
2482 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2483 }
2484 else
2485 {
2486 // AS5300s send connect speed as a string
2487 char tmp[30];
2488 memset(tmp, 0, sizeof(tmp));
2489 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2490 session[s].tx_connect_speed = atol(tmp);
2491 }
2492 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2493 break;
2494 case 38: // rx connect speed
2495 if (n == 4)
2496 {
2497 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2498 }
2499 else
2500 {
2501 // AS5300s send connect speed as a string
2502 char tmp[30];
2503 memset(tmp, 0, sizeof(tmp));
2504 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2505 session[s].rx_connect_speed = atol(tmp);
2506 }
2507 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2508 break;
2509 case 25: // Physical Channel ID
2510 {
2511 uint32_t tmp = ntohl(*(uint32_t *) b);
2512 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2513 break;
2514 }
2515 case 29: // Proxy Authentication Type
2516 {
2517 uint16_t atype = ntohs(*(uint16_t *)b);
2518 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2519 break;
2520 }
2521 case 30: // Proxy Authentication Name
2522 {
2523 char authname[64];
2524 memset(authname, 0, sizeof(authname));
2525 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2526 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2527 authname);
2528 break;
2529 }
2530 case 31: // Proxy Authentication Challenge
2531 {
2532 LOG(4, s, t, " Proxy Auth Challenge\n");
2533 break;
2534 }
2535 case 32: // Proxy Authentication ID
2536 {
2537 uint16_t authid = ntohs(*(uint16_t *)(b));
2538 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2539 break;
2540 }
2541 case 33: // Proxy Authentication Response
2542 LOG(4, s, t, " Proxy Auth Response\n");
2543 break;
2544 case 27: // last sent lcp
2545 { // find magic number
2546 uint8_t *p = b, *e = p + n;
2547 while (p + 1 < e && p[1] && p + p[1] <= e)
2548 {
2549 if (*p == 5 && p[1] == 6) // Magic-Number
2550 amagic = ntohl(*(uint32_t *) (p + 2));
2551 else if (*p == 7) // Protocol-Field-Compression
2552 aflags |= SESSION_PFC;
2553 else if (*p == 8) // Address-and-Control-Field-Compression
2554 aflags |= SESSION_ACFC;
2555 p += p[1];
2556 }
2557 }
2558 break;
2559 case 28: // last recv lcp confreq
2560 break;
2561 case 26: // Initial Received LCP CONFREQ
2562 break;
2563 case 39: // seq required - we control it as an LNS anyway...
2564 break;
2565 case 36: // Random Vector
2566 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2567 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2568 if (n > sizeof(session[s].random_vector))
2569 n = sizeof(session[s].random_vector);
2570 memcpy(session[s].random_vector, b, n);
2571 session[s].random_vector_length = n;
2572 break;
2573 case 46: // ppp disconnect cause
2574 if (n >= 5)
2575 {
2576 uint16_t code = ntohs(*(uint16_t *) b);
2577 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2578 uint8_t dir = *(b + 4);
2579
2580 LOG(4, s, t, " PPP disconnect cause "
2581 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2582 code, proto, dir, n - 5, b + 5);
2583
2584 disc_cause_set = mtype;
2585
2586 switch (code)
2587 {
2588 case 1: // admin disconnect
2589 disc_cause = TERM_ADMIN_RESET;
2590 disc_reason = "Administrative disconnect";
2591 break;
2592 case 3: // lcp terminate
2593 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2594 disc_cause = TERM_USER_REQUEST;
2595 disc_reason = "Normal disconnection";
2596 break;
2597 case 4: // compulsory encryption unavailable
2598 if (dir != 1) break; // 1=refused by peer, 2=local
2599 disc_cause = TERM_USER_ERROR;
2600 disc_reason = "Compulsory encryption refused";
2601 break;
2602 case 5: // lcp: fsm timeout
2603 disc_cause = TERM_PORT_ERROR;
2604 disc_reason = "LCP: FSM timeout";
2605 break;
2606 case 6: // lcp: no recognisable lcp packets received
2607 disc_cause = TERM_PORT_ERROR;
2608 disc_reason = "LCP: no recognisable LCP packets";
2609 break;
2610 case 7: // lcp: magic-no error (possibly looped back)
2611 disc_cause = TERM_PORT_ERROR;
2612 disc_reason = "LCP: magic-no error (possible loop)";
2613 break;
2614 case 8: // lcp: echo request timeout
2615 disc_cause = TERM_PORT_ERROR;
2616 disc_reason = "LCP: echo request timeout";
2617 break;
2618 case 13: // auth: fsm timeout
2619 disc_cause = TERM_SERVICE_UNAVAILABLE;
2620 disc_reason = "Authentication: FSM timeout";
2621 break;
2622 case 15: // auth: unacceptable auth protocol
2623 disc_cause = TERM_SERVICE_UNAVAILABLE;
2624 disc_reason = "Unacceptable authentication protocol";
2625 break;
2626 case 16: // auth: authentication failed
2627 disc_cause = TERM_SERVICE_UNAVAILABLE;
2628 disc_reason = "Authentication failed";
2629 break;
2630 case 17: // ncp: fsm timeout
2631 disc_cause = TERM_SERVICE_UNAVAILABLE;
2632 disc_reason = "NCP: FSM timeout";
2633 break;
2634 case 18: // ncp: no ncps available
2635 disc_cause = TERM_SERVICE_UNAVAILABLE;
2636 disc_reason = "NCP: no NCPs available";
2637 break;
2638 case 19: // ncp: failure to converge on acceptable address
2639 disc_cause = TERM_SERVICE_UNAVAILABLE;
2640 disc_reason = (dir == 1)
2641 ? "NCP: too many Configure-Naks received from peer"
2642 : "NCP: too many Configure-Naks sent to peer";
2643 break;
2644 case 20: // ncp: user not permitted to use any address
2645 disc_cause = TERM_SERVICE_UNAVAILABLE;
2646 disc_reason = (dir == 1)
2647 ? "NCP: local link address not acceptable to peer"
2648 : "NCP: remote link address not acceptable";
2649 break;
2650 }
2651 }
2652 break;
2653 default:
2654 {
2655 static char e[] = "unknown AVP 0xXXXX";
2656 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2657 fatal = flags;
2658 result = 2; // general error
2659 error = 8; // unknown mandatory AVP
2660 sprintf((msg = e) + 14, "%04x", mtype);
2661 continue; // next
2662 }
2663 }
2664 }
2665 // process message
2666 if (fatal & 0x80)
2667 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2668 else
2669 switch (message)
2670 {
2671 case 1: // SCCRQ - Start Control Connection Request
2672 tunnel[t].state = TUNNELOPENING;
2673 if (main_quit != QUIT_SHUTDOWN)
2674 {
2675 controlt *c = controlnew(2); // sending SCCRP
2676 control16(c, 2, version, 1); // protocol version
2677 control32(c, 3, 3, 1); // framing
2678 controls(c, 7, hostname, 1); // host name
2679 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2680 control16(c, 9, t, 1); // assigned tunnel
2681 controladd(c, 0, t); // send the resply
2682 }
2683 else
2684 {
2685 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2686 }
2687 break;
2688 case 2: // SCCRP
2689 tunnel[t].state = TUNNELOPEN;
2690 break;
2691 case 3: // SCCN
2692 tunnel[t].state = TUNNELOPEN;
2693 controlnull(t); // ack
2694 break;
2695 case 4: // StopCCN
2696 controlnull(t); // ack
2697 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2698 break;
2699 case 6: // HELLO
2700 controlnull(t); // simply ACK
2701 break;
2702 case 7: // OCRQ
2703 // TBA
2704 break;
2705 case 8: // OCRO
2706 // TBA
2707 break;
2708 case 9: // OCCN
2709 // TBA
2710 break;
2711 case 10: // ICRQ
2712 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2713 {
2714 controlt *c = controlnew(11); // ICRP
2715
2716 s = sessionfree;
2717 sessionfree = session[s].next;
2718 memset(&session[s], 0, sizeof(session[s]));
2719
2720 if (s > config->cluster_highest_sessionid)
2721 config->cluster_highest_sessionid = s;
2722
2723 session[s].opened = time_now;
2724 session[s].tunnel = t;
2725 session[s].far = asession;
2726 session[s].last_packet = session[s].last_data = time_now;
2727 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2728 control16(c, 14, s, 1); // assigned session
2729 controladd(c, asession, t); // send the reply
2730
2731 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2732 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2733
2734 session[s].ppp.phase = Establish;
2735 session[s].ppp.lcp = Starting;
2736
2737 STAT(session_created);
2738 break;
2739 }
2740
2741 {
2742 controlt *c = controlnew(14); // CDN
2743 if (!sessionfree)
2744 {
2745 STAT(session_overflow);
2746 LOG(1, 0, t, "No free sessions\n");
2747 control16(c, 1, 4, 0); // temporary lack of resources
2748 }
2749 else
2750 control16(c, 1, 2, 7); // shutting down, try another
2751
2752 controladd(c, asession, t); // send the message
2753 }
2754 return;
2755 case 11: // ICRP
2756 // TBA
2757 break;
2758 case 12: // ICCN
2759 if (amagic == 0) amagic = time_now;
2760 session[s].magic = amagic; // set magic number
2761 session[s].flags = aflags; // set flags received
2762 session[s].mru = PPPoE_MRU; // default
2763 controlnull(t); // ack
2764
2765 // start LCP
2766 sess_local[s].lcp_authtype = config->radius_authprefer;
2767 sess_local[s].ppp_mru = MRU;
2768
2769 // Set multilink options before sending initial LCP packet
2770 sess_local[s].mp_mrru = 1614;
2771 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2772
2773 sendlcp(s, t);
2774 change_state(s, lcp, RequestSent);
2775 break;
2776
2777 case 14: // CDN
2778 controlnull(t); // ack
2779 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2780 break;
2781 case 0xFFFF:
2782 LOG(1, s, t, "Missing message type\n");
2783 break;
2784 default:
2785 STAT(tunnel_rx_errors);
2786 if (mandatory)
2787 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2788 else
2789 LOG(1, s, t, "Unknown message type %u\n", message);
2790 break;
2791 }
2792 if (chapresponse) free(chapresponse);
2793 cluster_send_tunnel(t);
2794 }
2795 else
2796 {
2797 LOG(4, s, t, " Got a ZLB ack\n");
2798 }
2799 }
2800 else
2801 { // data
2802 uint16_t proto;
2803
2804 LOG_HEX(5, "Receive Tunnel Data", p, l);
2805 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2806 { // HDLC address header, discard
2807 p += 2;
2808 l -= 2;
2809 }
2810 if (l < 2)
2811 {
2812 LOG(1, s, t, "Short ppp length %d\n", l);
2813 STAT(tunnel_rx_errors);
2814 return;
2815 }
2816 if (*p & 1)
2817 {
2818 proto = *p++;
2819 l--;
2820 }
2821 else
2822 {
2823 proto = ntohs(*(uint16_t *) p);
2824 p += 2;
2825 l -= 2;
2826 }
2827
2828 if (s && !session[s].opened) // Is something wrong??
2829 {
2830 if (!config->cluster_iam_master)
2831 {
2832 // Pass it off to the master to deal with..
2833 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2834 return;
2835 }
2836
2837
2838 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
2839 STAT(tunnel_rx_errors);
2840 return;
2841 }
2842
2843 if (proto == PPPPAP)
2844 {
2845 session[s].last_packet = time_now;
2846 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2847 processpap(s, t, p, l);
2848 }
2849 else if (proto == PPPCHAP)
2850 {
2851 session[s].last_packet = time_now;
2852 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2853 processchap(s, t, p, l);
2854 }
2855 else if (proto == PPPLCP)
2856 {
2857 session[s].last_packet = time_now;
2858 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2859 processlcp(s, t, p, l);
2860 }
2861 else if (proto == PPPIPCP)
2862 {
2863 session[s].last_packet = time_now;
2864 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2865 processipcp(s, t, p, l);
2866 }
2867 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
2868 {
2869 session[s].last_packet = time_now;
2870 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2871 processipv6cp(s, t, p, l);
2872 }
2873 else if (proto == PPPCCP)
2874 {
2875 session[s].last_packet = time_now;
2876 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2877 processccp(s, t, p, l);
2878 }
2879 else if (proto == PPPIP)
2880 {
2881 if (session[s].die)
2882 {
2883 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
2884 return; // closing session, PPP not processed
2885 }
2886
2887 session[s].last_packet = session[s].last_data = time_now;
2888 if (session[s].walled_garden && !config->cluster_iam_master)
2889 {
2890 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2891 return;
2892 }
2893
2894 processipin(s, t, p, l);
2895 }
2896 else if (proto == PPPMP)
2897 {
2898 if (session[s].die)
2899 {
2900 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
2901 return; // closing session, PPP not processed
2902 }
2903
2904 session[s].last_packet = session[s].last_data = time_now;
2905 if (session[s].walled_garden && !config->cluster_iam_master)
2906 {
2907 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2908 return;
2909 }
2910
2911 processmpin(s, t, p, l);
2912 }
2913 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
2914 {
2915 if (session[s].die)
2916 {
2917 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
2918 return; // closing session, PPP not processed
2919 }
2920
2921 session[s].last_packet = session[s].last_data = time_now;
2922 if (session[s].walled_garden && !config->cluster_iam_master)
2923 {
2924 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2925 return;
2926 }
2927
2928 processipv6in(s, t, p, l);
2929 }
2930 else if (session[s].ppp.lcp == Opened)
2931 {
2932 session[s].last_packet = time_now;
2933 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2934 protoreject(s, t, p, l, proto);
2935 }
2936 else
2937 {
2938 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
2939 proto, ppp_state(session[s].ppp.lcp));
2940 }
2941 }
2942 }
2943
2944 // read and process packet on tun
2945 static void processtun(uint8_t * buf, int len)
2946 {
2947 LOG_HEX(5, "Receive TUN Data", buf, len);
2948 STAT(tun_rx_packets);
2949 INC_STAT(tun_rx_bytes, len);
2950
2951 CSTAT(processtun);
2952
2953 eth_rx_pkt++;
2954 eth_rx += len;
2955 if (len < 22)
2956 {
2957 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
2958 STAT(tun_rx_errors);
2959 return;
2960 }
2961
2962 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
2963 processipout(buf, len);
2964 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
2965 && config->ipv6_prefix.s6_addr[0])
2966 processipv6out(buf, len);
2967
2968 // Else discard.
2969 }
2970
2971 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2972 // that we look at the whole of the tunnel, radius and session tables
2973 // every second
2974 static void regular_cleanups(double period)
2975 {
2976 // Next tunnel, radius and session to check for actions on.
2977 static tunnelidt t = 0;
2978 static int r = 0;
2979 static sessionidt s = 0;
2980
2981 int t_actions = 0;
2982 int r_actions = 0;
2983 int s_actions = 0;
2984
2985 int t_slice;
2986 int r_slice;
2987 int s_slice;
2988
2989 int i;
2990 int a;
2991
2992 // divide up tables into slices based on the last run
2993 t_slice = config->cluster_highest_tunnelid * period;
2994 r_slice = (MAXRADIUS - 1) * period;
2995 s_slice = config->cluster_highest_sessionid * period;
2996
2997 if (t_slice < 1)
2998 t_slice = 1;
2999 else if (t_slice > config->cluster_highest_tunnelid)
3000 t_slice = config->cluster_highest_tunnelid;
3001
3002 if (r_slice < 1)
3003 r_slice = 1;
3004 else if (r_slice > (MAXRADIUS - 1))
3005 r_slice = MAXRADIUS - 1;
3006
3007 if (s_slice < 1)
3008 s_slice = 1;
3009 else if (s_slice > config->cluster_highest_sessionid)
3010 s_slice = config->cluster_highest_sessionid;
3011
3012 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3013
3014 for (i = 0; i < t_slice; i++)
3015 {
3016 t++;
3017 if (t > config->cluster_highest_tunnelid)
3018 t = 1;
3019
3020 // check for expired tunnels
3021 if (tunnel[t].die && tunnel[t].die <= TIME)
3022 {
3023 STAT(tunnel_timeout);
3024 tunnelkill(t, "Expired");
3025 t_actions++;
3026 continue;
3027 }
3028 // check for message resend
3029 if (tunnel[t].retry && tunnel[t].controlc)
3030 {
3031 // resend pending messages as timeout on reply
3032 if (tunnel[t].retry <= TIME)
3033 {
3034 controlt *c = tunnel[t].controls;
3035 uint8_t w = tunnel[t].window;
3036 tunnel[t].try++; // another try
3037 if (tunnel[t].try > 5)
3038 tunnelkill(t, "Timeout on control message"); // game over
3039 else
3040 while (c && w--)
3041 {
3042 tunnelsend(c->buf, c->length, t);
3043 c = c->next;
3044 }
3045
3046 t_actions++;
3047 }
3048 }
3049 // Send hello
3050 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3051 {
3052 controlt *c = controlnew(6); // sending HELLO
3053 controladd(c, 0, t); // send the message
3054 LOG(3, 0, t, "Sending HELLO message\n");
3055 t_actions++;
3056 }
3057
3058 // Check for tunnel changes requested from the CLI
3059 if ((a = cli_tunnel_actions[t].action))
3060 {
3061 cli_tunnel_actions[t].action = 0;
3062 if (a & CLI_TUN_KILL)
3063 {
3064 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3065 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3066 t_actions++;
3067 }
3068 }
3069 }
3070
3071 for (i = 0; i < r_slice; i++)
3072 {
3073 r++;
3074 if (r >= MAXRADIUS)
3075 r = 1;
3076
3077 if (!radius[r].state)
3078 continue;
3079
3080 if (radius[r].retry <= TIME)
3081 {
3082 radiusretry(r);
3083 r_actions++;
3084 }
3085 }
3086
3087 for (i = 0; i < s_slice; i++)
3088 {
3089 s++;
3090 if (s > config->cluster_highest_sessionid)
3091 s = 1;
3092
3093 if (!session[s].opened) // Session isn't in use
3094 continue;
3095
3096 // check for expired sessions
3097 if (session[s].die)
3098 {
3099 if (session[s].die <= TIME)
3100 {
3101 sessionkill(s, "Expired");
3102 s_actions++;
3103 }
3104 continue;
3105 }
3106
3107 // PPP timeouts
3108 if (sess_local[s].lcp.restart <= time_now)
3109 {
3110 int next_state = session[s].ppp.lcp;
3111 switch (session[s].ppp.lcp)
3112 {
3113 case RequestSent:
3114 case AckReceived:
3115 next_state = RequestSent;
3116
3117 case AckSent:
3118 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3119 {
3120 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3121 sendlcp(s, session[s].tunnel);
3122 change_state(s, lcp, next_state);
3123 }
3124 else
3125 {
3126 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3127 STAT(session_timeout);
3128 }
3129
3130 s_actions++;
3131 }
3132
3133 if (session[s].die)
3134 continue;
3135 }
3136
3137 if (sess_local[s].ipcp.restart <= time_now)
3138 {
3139 int next_state = session[s].ppp.ipcp;
3140 switch (session[s].ppp.ipcp)
3141 {
3142 case RequestSent:
3143 case AckReceived:
3144 next_state = RequestSent;
3145
3146 case AckSent:
3147 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3148 {
3149 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3150 sendipcp(s, session[s].tunnel);
3151 change_state(s, ipcp, next_state);
3152 }
3153 else
3154 {
3155 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3156 STAT(session_timeout);
3157 }
3158
3159 s_actions++;
3160 }
3161
3162 if (session[s].die)
3163 continue;
3164 }
3165
3166 if (sess_local[s].ipv6cp.restart <= time_now)
3167 {
3168 int next_state = session[s].ppp.ipv6cp;
3169 switch (session[s].ppp.ipv6cp)
3170 {
3171 case RequestSent:
3172 case AckReceived:
3173 next_state = RequestSent;
3174
3175 case AckSent:
3176 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3177 {
3178 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3179 sendipv6cp(s, session[s].tunnel);
3180 change_state(s, ipv6cp, next_state);
3181 }
3182 else
3183 {
3184 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3185 change_state(s, ipv6cp, Stopped);
3186 }
3187
3188 s_actions++;
3189 }
3190 }
3191
3192 if (sess_local[s].ccp.restart <= time_now)
3193 {
3194 int next_state = session[s].ppp.ccp;
3195 switch (session[s].ppp.ccp)
3196 {
3197 case RequestSent:
3198 case AckReceived:
3199 next_state = RequestSent;
3200
3201 case AckSent:
3202 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3203 {
3204 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3205 sendccp(s, session[s].tunnel);
3206 change_state(s, ccp, next_state);
3207 }
3208 else
3209 {
3210 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3211 change_state(s, ccp, Stopped);
3212 }
3213
3214 s_actions++;
3215 }
3216 }
3217
3218 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3219 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3220 {
3221 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3222 STAT(session_timeout);
3223 s_actions++;
3224 continue;
3225 }
3226
3227 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3228 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3229 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3230 {
3231 uint8_t b[MAXETHER];
3232
3233 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3234 if (!q) continue;
3235
3236 *q = EchoReq;
3237 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3238 *(uint16_t *)(q + 2) = htons(8); // Length
3239 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3240
3241 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3242 (int)(time_now - session[s].last_packet));
3243 tunnelsend(b, 24, session[s].tunnel); // send it
3244 sess_local[s].last_echo = time_now;
3245 s_actions++;
3246 }
3247
3248 // Drop sessions who have reached session_timeout seconds
3249 if (session[s].session_timeout)
3250 {
3251 bundleidt bid = session[s].bundle;
3252 if (bid)
3253 {
3254 if (time_now - bundle[bid].last_check >= 1)
3255 {
3256 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3257 bundle[bid].last_check = time_now;
3258 if (bundle[bid].online_time >= session[s].session_timeout)
3259 {
3260 int ses;
3261 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3262 {
3263 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3264 s_actions++;
3265 continue;
3266 }
3267 }
3268 }
3269 }
3270 else if (time_now - session[s].opened >= session[s].session_timeout)
3271 {
3272 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3273 s_actions++;
3274 continue;
3275 }
3276 }
3277
3278 // Drop sessions who have reached idle_timeout seconds
3279 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3280 {
3281 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3282 STAT(session_timeout);
3283 s_actions++;
3284 continue;
3285 }
3286
3287 // Check for actions requested from the CLI
3288 if ((a = cli_session_actions[s].action))
3289 {
3290 int send = 0;
3291
3292 cli_session_actions[s].action = 0;
3293 if (a & CLI_SESS_KILL)
3294 {
3295 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3296 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3297 a = 0; // dead, no need to check for other actions
3298 s_actions++;
3299 }
3300
3301 if (a & CLI_SESS_NOSNOOP)
3302 {
3303 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3304 session[s].snoop_ip = 0;
3305 session[s].snoop_port = 0;
3306 s_actions++;
3307 send++;
3308 }
3309 else if (a & CLI_SESS_SNOOP)
3310 {
3311 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3312 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3313 cli_session_actions[s].snoop_port);
3314
3315 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3316 session[s].snoop_port = cli_session_actions[s].snoop_port;
3317 s_actions++;
3318 send++;
3319 }
3320
3321 if (a & CLI_SESS_NOTHROTTLE)
3322 {
3323 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3324 throttle_session(s, 0, 0);
3325 s_actions++;
3326 send++;
3327 }
3328 else if (a & CLI_SESS_THROTTLE)
3329 {
3330 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3331 cli_session_actions[s].throttle_in,
3332 cli_session_actions[s].throttle_out);
3333
3334 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3335 s_actions++;
3336 send++;
3337 }
3338
3339 if (a & CLI_SESS_NOFILTER)
3340 {
3341 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3342 filter_session(s, 0, 0);
3343 s_actions++;
3344 send++;
3345 }
3346 else if (a & CLI_SESS_FILTER)
3347 {
3348 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3349 cli_session_actions[s].filter_in,
3350 cli_session_actions[s].filter_out);
3351
3352 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3353 s_actions++;
3354 send++;
3355 }
3356
3357 if (send)
3358 cluster_send_session(s);
3359 }
3360
3361 // RADIUS interim accounting
3362 if (config->radius_accounting && config->radius_interim > 0
3363 && session[s].ip && !session[s].walled_garden
3364 && !sess_local[s].radius // RADIUS already in progress
3365 && time_now - sess_local[s].last_interim >= config->radius_interim
3366 && session[s].flags & SESSION_STARTED)
3367 {
3368 int rad = radiusnew(s);
3369 if (!rad)
3370 {
3371 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3372 STAT(radius_overflow);
3373 continue;
3374 }
3375
3376 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3377 session[s].user, session[s].unique_id);
3378
3379 radiussend(rad, RADIUSINTERIM);
3380 sess_local[s].last_interim = time_now;
3381 s_actions++;
3382 }
3383 }
3384
3385 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3386 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3387 }
3388
3389 //
3390 // Are we in the middle of a tunnel update, or radius
3391 // requests??
3392 //
3393 static int still_busy(void)
3394 {
3395 int i;
3396 static clockt last_talked = 0;
3397 static clockt start_busy_wait = 0;
3398
3399 if (!config->cluster_iam_master)
3400 {
3401 #ifdef BGP
3402 static time_t stopped_bgp = 0;
3403 if (bgp_configured)
3404 {
3405 if (!stopped_bgp)
3406 {
3407 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3408
3409 for (i = 0; i < BGP_NUM_PEERS; i++)
3410 if (bgp_peers[i].state == Established)
3411 bgp_stop(&bgp_peers[i]);
3412
3413 stopped_bgp = time_now;
3414
3415 // we don't want to become master
3416 cluster_send_ping(0);
3417
3418 return 1;
3419 }
3420
3421 if (time_now < (stopped_bgp + QUIT_DELAY))
3422 return 1;
3423 }
3424 #endif /* BGP */
3425
3426 return 0;
3427 }
3428
3429 if (main_quit == QUIT_SHUTDOWN)
3430 {
3431 static int dropped = 0;
3432 if (!dropped)
3433 {
3434 int i;
3435
3436 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3437 for (i = 1; i < MAXTUNNEL; i++)
3438 if (tunnel[i].ip || tunnel[i].state)
3439 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3440
3441 dropped = 1;
3442 }
3443 }
3444
3445 if (start_busy_wait == 0)
3446 start_busy_wait = TIME;
3447
3448 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3449 {
3450 if (!tunnel[i].controlc)
3451 continue;
3452
3453 if (last_talked != TIME)
3454 {
3455 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3456 last_talked = TIME;
3457 }
3458 return 1;
3459 }
3460
3461 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3462 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3463 {
3464 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3465 return 0;
3466 }
3467
3468 for (i = 1; i < MAXRADIUS; i++)
3469 {
3470 if (radius[i].state == RADIUSNULL)
3471 continue;
3472 if (radius[i].state == RADIUSWAIT)
3473 continue;
3474
3475 if (last_talked != TIME)
3476 {
3477 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3478 last_talked = TIME;
3479 }
3480 return 1;
3481 }
3482
3483 return 0;
3484 }
3485
3486 #ifdef HAVE_EPOLL
3487 # include <sys/epoll.h>
3488 #else
3489 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3490 # include "fake_epoll.h"
3491 #endif
3492
3493 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3494 #define BASE_FDS 6
3495
3496 // additional polled fds
3497 #ifdef BGP
3498 # define EXTRA_FDS BGP_NUM_PEERS
3499 #else
3500 # define EXTRA_FDS 0
3501 #endif
3502
3503 // main loop - gets packets on tun or udp and processes them
3504 static void mainloop(void)
3505 {
3506 int i;
3507 uint8_t buf[65536];
3508 clockt next_cluster_ping = 0; // send initial ping immediately
3509 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3510 int maxevent = sizeof(events)/sizeof(*events);
3511
3512 if ((epollfd = epoll_create(maxevent)) < 0)
3513 {
3514 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3515 exit(1);
3516 }
3517
3518 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3519 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
3520
3521 /* setup our fds to poll for input */
3522 {
3523 static struct event_data d[BASE_FDS];
3524 struct epoll_event e;
3525
3526 e.events = EPOLLIN;
3527 i = 0;
3528
3529 if (clifd >= 0)
3530 {
3531 d[i].type = FD_TYPE_CLI;
3532 e.data.ptr = &d[i++];
3533 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3534 }
3535
3536 d[i].type = FD_TYPE_CLUSTER;
3537 e.data.ptr = &d[i++];
3538 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3539
3540 d[i].type = FD_TYPE_TUN;
3541 e.data.ptr = &d[i++];
3542 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3543
3544 d[i].type = FD_TYPE_UDP;
3545 e.data.ptr = &d[i++];
3546 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3547
3548 d[i].type = FD_TYPE_CONTROL;
3549 e.data.ptr = &d[i++];
3550 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3551
3552 d[i].type = FD_TYPE_DAE;
3553 e.data.ptr = &d[i++];
3554 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3555 }
3556
3557 #ifdef BGP
3558 signal(SIGPIPE, SIG_IGN);
3559 bgp_setup(config->as_number);
3560 if (config->bind_address)
3561 bgp_add_route(config->bind_address, 0xffffffff);
3562
3563 for (i = 0; i < BGP_NUM_PEERS; i++)
3564 {
3565 if (config->neighbour[i].name[0])
3566 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3567 config->neighbour[i].as, config->neighbour[i].keepalive,
3568 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3569 }
3570 #endif /* BGP */
3571
3572 while (!main_quit || still_busy())
3573 {
3574 int more = 0;
3575 int n;
3576
3577
3578 if (main_reload)
3579 {
3580 main_reload = 0;
3581 read_config_file();
3582 config->reload_config++;
3583 }
3584
3585 if (config->reload_config)
3586 {
3587 config->reload_config = 0;
3588 update_config();
3589 }
3590
3591 #ifdef BGP
3592 bgp_set_poll();
3593 #endif /* BGP */
3594
3595 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3596 STAT(select_called);
3597
3598 TIME = now(NULL);
3599 if (n < 0)
3600 {
3601 if (errno == EINTR ||
3602 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3603 continue;
3604
3605 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3606 break; // exit
3607 }
3608
3609 if (n)
3610 {
3611 struct sockaddr_in addr;
3612 struct in_addr local;
3613 socklen_t alen;
3614 int c, s;
3615 int udp_ready = 0;
3616 int tun_ready = 0;
3617 int cluster_ready = 0;
3618 int udp_pkts = 0;
3619 int tun_pkts = 0;
3620 int cluster_pkts = 0;
3621 #ifdef BGP
3622 uint32_t bgp_events[BGP_NUM_PEERS];
3623 memset(bgp_events, 0, sizeof(bgp_events));
3624 #endif /* BGP */
3625
3626 for (c = n, i = 0; i < c; i++)
3627 {
3628 struct event_data *d = events[i].data.ptr;
3629
3630 switch (d->type)
3631 {
3632 case FD_TYPE_CLI: // CLI connections
3633 {
3634 int cli;
3635
3636 alen = sizeof(addr);
3637 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3638 {
3639 cli_do(cli);
3640 close(cli);
3641 }
3642 else
3643 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3644
3645 n--;
3646 break;
3647 }
3648
3649 // these are handled below, with multiple interleaved reads
3650 case FD_TYPE_CLUSTER: cluster_ready++; break;
3651 case FD_TYPE_TUN: tun_ready++; break;
3652 case FD_TYPE_UDP: udp_ready++; break;
3653
3654 case FD_TYPE_CONTROL: // nsctl commands
3655 alen = sizeof(addr);
3656 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3657 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3658 n--;
3659 break;
3660
3661 case FD_TYPE_DAE: // DAE requests
3662 alen = sizeof(addr);
3663 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3664 if (s > 0) processdae(buf, s, &addr, alen, &local);
3665 n--;
3666 break;
3667
3668 case FD_TYPE_RADIUS: // RADIUS response
3669 alen = sizeof(addr);
3670 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3671 if (s >= 0 && config->cluster_iam_master)
3672 {
3673 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3674 addr.sin_addr.s_addr == config->radiusserver[1])
3675 processrad(buf, s, d->index);
3676 else
3677 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3678 fmtaddr(addr.sin_addr.s_addr, 0));
3679 }
3680
3681 n--;
3682 break;
3683
3684 #ifdef BGP
3685 case FD_TYPE_BGP:
3686 bgp_events[d->index] = events[i].events;
3687 n--;
3688 break;
3689 #endif /* BGP */
3690
3691 default:
3692 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3693 }
3694 }
3695
3696 #ifdef BGP
3697 bgp_process(bgp_events);
3698 #endif /* BGP */
3699
3700 for (c = 0; n && c < config->multi_read_count; c++)
3701 {
3702 // L2TP
3703 if (udp_ready)
3704 {
3705 alen = sizeof(addr);
3706 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3707 {
3708 processudp(buf, s, &addr);
3709 udp_pkts++;
3710 }
3711 else
3712 {
3713 udp_ready = 0;
3714 n--;
3715 }
3716 }
3717
3718 // incoming IP
3719 if (tun_ready)
3720 {
3721 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3722 {
3723 processtun(buf, s);
3724 tun_pkts++;
3725 }
3726 else
3727 {
3728 tun_ready = 0;
3729 n--;
3730 }
3731 }
3732
3733 // cluster
3734 if (cluster_ready)
3735 {
3736 alen = sizeof(addr);
3737 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3738 {
3739 processcluster(buf, s, addr.sin_addr.s_addr);
3740 cluster_pkts++;
3741 }
3742 else
3743 {
3744 cluster_ready = 0;
3745 n--;
3746 }
3747 }
3748 }
3749
3750 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3751 STAT(multi_read_used);
3752
3753 if (c >= config->multi_read_count)
3754 {
3755 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3756 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3757
3758 STAT(multi_read_exceeded);
3759 more++;
3760 }
3761 }
3762
3763 if (time_changed)
3764 {
3765 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3766
3767 // Log current traffic stats
3768 snprintf(config->bandwidth, sizeof(config->bandwidth),
3769 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3770 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3771 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
3772 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
3773
3774 udp_tx = udp_rx = 0;
3775 udp_rx_pkt = eth_rx_pkt = 0;
3776 eth_tx = eth_rx = 0;
3777 time_changed = 0;
3778
3779 if (config->dump_speed)
3780 printf("%s\n", config->bandwidth);
3781
3782 // Update the internal time counter
3783 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3784
3785 {
3786 // Run timer hooks
3787 struct param_timer p = { time_now };
3788 run_plugins(PLUGIN_TIMER, &p);
3789 }
3790 }
3791
3792 // Runs on every machine (master and slaves).
3793 if (next_cluster_ping <= TIME)
3794 {
3795 // Check to see which of the cluster is still alive..
3796
3797 cluster_send_ping(basetime); // Only does anything if we're a slave
3798 cluster_check_master(); // ditto.
3799
3800 cluster_heartbeat(); // Only does anything if we're a master.
3801 cluster_check_slaves(); // ditto.
3802
3803 master_update_counts(); // If we're a slave, send our byte counters to our master.
3804
3805 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
3806 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
3807 else
3808 next_cluster_ping = TIME + config->cluster_hb_interval;
3809 }
3810
3811 if (!config->cluster_iam_master)
3812 continue;
3813
3814 // Run token bucket filtering queue..
3815 // Only run it every 1/10th of a second.
3816 {
3817 static clockt last_run = 0;
3818 if (last_run != TIME)
3819 {
3820 last_run = TIME;
3821 tbf_run_timer();
3822 }
3823 }
3824
3825 // Handle timeouts, retries etc.
3826 {
3827 static double last_clean = 0;
3828 double this_clean;
3829 double diff;
3830
3831 TIME = now(&this_clean);
3832 diff = this_clean - last_clean;
3833
3834 // Run during idle time (after we've handled
3835 // all incoming packets) or every 1/10th sec
3836 if (!more || diff > 0.1)
3837 {
3838 regular_cleanups(diff);
3839 last_clean = this_clean;
3840 }
3841 }
3842
3843 if (*config->accounting_dir)
3844 {
3845 static clockt next_acct = 0;
3846 static clockt next_shut_acct = 0;
3847
3848 if (next_acct <= TIME)
3849 {
3850 // Dump accounting data
3851 next_acct = TIME + ACCT_TIME;
3852 next_shut_acct = TIME + ACCT_SHUT_TIME;
3853 dump_acct_info(1);
3854 }
3855 else if (next_shut_acct <= TIME)
3856 {
3857 // Dump accounting data for shutdown sessions
3858 next_shut_acct = TIME + ACCT_SHUT_TIME;
3859 if (shut_acct_n)
3860 dump_acct_info(0);
3861 }
3862 }
3863 }
3864
3865 // Are we the master and shutting down??
3866 if (config->cluster_iam_master)
3867 cluster_heartbeat(); // Flush any queued changes..
3868
3869 // Ok. Notify everyone we're shutting down. If we're
3870 // the master, this will force an election.
3871 cluster_send_ping(0);
3872
3873 //
3874 // Important!!! We MUST not process any packets past this point!
3875 LOG(1, 0, 0, "Shutdown complete\n");
3876 }
3877
3878 static void stripdomain(char *host)
3879 {
3880 char *p;
3881
3882 if ((p = strchr(host, '.')))
3883 {
3884 char *domain = 0;
3885 char _domain[1024];
3886
3887 // strip off domain
3888 FILE *resolv = fopen("/etc/resolv.conf", "r");
3889 if (resolv)
3890 {
3891 char buf[1024];
3892 char *b;
3893
3894 while (fgets(buf, sizeof(buf), resolv))
3895 {
3896 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
3897 continue;
3898
3899 if (!isspace(buf[6]))
3900 continue;
3901
3902 b = buf + 7;
3903 while (isspace(*b)) b++;
3904
3905 if (*b)
3906 {
3907 char *d = b;
3908 while (*b && !isspace(*b)) b++;
3909 *b = 0;
3910 if (buf[0] == 'd') // domain is canonical
3911 {
3912 domain = d;
3913 break;
3914 }
3915
3916 // first search line
3917 if (!domain)
3918 {
3919 // hold, may be subsequent domain line
3920 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
3921 domain = _domain;
3922 }
3923 }
3924 }
3925
3926 fclose(resolv);
3927 }
3928
3929 if (domain)
3930 {
3931 int hl = strlen(host);
3932 int dl = strlen(domain);
3933 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
3934 host[hl -dl - 1] = 0;
3935 }
3936 else
3937 {
3938 *p = 0; // everything after first dot
3939 }
3940 }
3941 }
3942
3943 // Init data structures
3944 static void initdata(int optdebug, char *optconfig)
3945 {
3946 int i;
3947
3948 if (!(config = shared_malloc(sizeof(configt))))
3949 {
3950 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
3951 exit(1);
3952 }
3953
3954 memset(config, 0, sizeof(configt));
3955 time(&config->start_time);
3956 strncpy(config->config_file, optconfig, strlen(optconfig));
3957 config->debug = optdebug;
3958 config->num_tbfs = MAXTBFS;
3959 config->rl_rate = 28; // 28kbps
3960 config->cluster_mcast_ttl = 1;
3961 config->cluster_master_min_adv = 1;
3962 config->ppp_restart_time = 3;
3963 config->ppp_max_configure = 10;
3964 config->ppp_max_failure = 5;
3965 config->kill_timedout_sessions = 1;
3966 strcpy(config->random_device, RANDOMDEVICE);
3967
3968 log_stream = stderr;
3969
3970 #ifdef RINGBUFFER
3971 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
3972 {
3973 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
3974 exit(1);
3975 }
3976 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
3977 #endif
3978
3979 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
3980 {
3981 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
3982 exit(1);
3983 }
3984 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
3985 {
3986 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
3987 exit(1);
3988 }
3989 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
3990 {
3991 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
3992 exit(1);
3993 }
3994 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
3995 {
3996 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
3997 exit(1);
3998 }
3999 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4000 {
4001 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4002 exit(1);
4003 }
4004
4005 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4006 {
4007 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4008 exit(1);
4009 }
4010
4011 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4012 {
4013 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4014 exit(1);
4015 }
4016
4017 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4018 {
4019 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4020 exit(1);
4021 }
4022
4023 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4024 {
4025 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4026 exit(1);
4027 }
4028 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4029
4030 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4031 {
4032 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4033 exit(1);
4034 }
4035 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4036
4037 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4038 {
4039 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4040 exit(1);
4041 }
4042 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4043
4044 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4045 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4046 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4047 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4048 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4049
4050 // Put all the sessions on the free list marked as undefined.
4051 for (i = 1; i < MAXSESSION; i++)
4052 {
4053 session[i].next = i + 1;
4054 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4055 }
4056 session[MAXSESSION - 1].next = 0;
4057 sessionfree = 1;
4058
4059 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4060 for (i = 1; i < MAXTUNNEL; i++)
4061 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4062
4063 for (i = 1; i < MAXBUNDLE; i++) {
4064 bundle[i].state = BUNDLEUNDEF;
4065 }
4066
4067 if (!*hostname)
4068 {
4069 // Grab my hostname unless it's been specified
4070 gethostname(hostname, sizeof(hostname));
4071 stripdomain(hostname);
4072 }
4073
4074 _statistics->start_time = _statistics->last_reset = time(NULL);
4075
4076 #ifdef BGP
4077 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4078 {
4079 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4080 exit(1);
4081 }
4082 #endif /* BGP */
4083 }
4084
4085 static int assign_ip_address(sessionidt s)
4086 {
4087 uint32_t i;
4088 int best = -1;
4089 time_t best_time = time_now;
4090 char *u = session[s].user;
4091 char reuse = 0;
4092
4093
4094 CSTAT(assign_ip_address);
4095
4096 for (i = 1; i < ip_pool_size; i++)
4097 {
4098 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4099 continue;
4100
4101 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4102 {
4103 best = i;
4104 reuse = 1;
4105 break;
4106 }
4107
4108 if (ip_address_pool[i].last < best_time)
4109 {
4110 best = i;
4111 if (!(best_time = ip_address_pool[i].last))
4112 break; // never used, grab this one
4113 }
4114 }
4115
4116 if (best < 0)
4117 {
4118 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4119 return 0;
4120 }
4121
4122 session[s].ip = ip_address_pool[best].address;
4123 session[s].ip_pool_index = best;
4124 ip_address_pool[best].assigned = 1;
4125 ip_address_pool[best].last = time_now;
4126 ip_address_pool[best].session = s;
4127 if (session[s].walled_garden)
4128 /* Don't track addresses of users in walled garden (note: this
4129 means that their address isn't "sticky" even if they get
4130 un-gardened). */
4131 ip_address_pool[best].user[0] = 0;
4132 else
4133 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4134
4135 STAT(ip_allocated);
4136 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4137 reuse ? "Reusing" : "Allocating", best);
4138
4139 return 1;
4140 }
4141
4142 static void free_ip_address(sessionidt s)
4143 {
4144 int i = session[s].ip_pool_index;
4145
4146
4147 CSTAT(free_ip_address);
4148
4149 if (!session[s].ip)
4150 return; // what the?
4151
4152 if (i < 0) // Is this actually part of the ip pool?
4153 i = 0;
4154
4155 STAT(ip_freed);
4156 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4157 session[s].ip = 0;
4158 ip_address_pool[i].assigned = 0;
4159 ip_address_pool[i].session = 0;
4160 ip_address_pool[i].last = time_now;
4161 }
4162
4163 //
4164 // Fsck the address pool against the session table.
4165 // Normally only called when we become a master.
4166 //
4167 // This isn't perfect: We aren't keep tracking of which
4168 // users used to have an IP address.
4169 //
4170 void rebuild_address_pool(void)
4171 {
4172 int i;
4173
4174 //
4175 // Zero the IP pool allocation, and build
4176 // a map from IP address to pool index.
4177 for (i = 1; i < MAXIPPOOL; ++i)
4178 {
4179 ip_address_pool[i].assigned = 0;
4180 ip_address_pool[i].session = 0;
4181 if (!ip_address_pool[i].address)
4182 continue;
4183
4184 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4185 }
4186
4187 for (i = 0; i < MAXSESSION; ++i)
4188 {
4189 int ipid;
4190 if (!(session[i].opened && session[i].ip))
4191 continue;
4192
4193 ipid = - lookup_ipmap(htonl(session[i].ip));
4194
4195 if (session[i].ip_pool_index < 0)
4196 {
4197 // Not allocated out of the pool.
4198 if (ipid < 1) // Not found in the pool either? good.
4199 continue;
4200
4201 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4202 i, fmtaddr(session[i].ip, 0), ipid);
4203
4204 // Fall through and process it as part of the pool.
4205 }
4206
4207
4208 if (ipid > MAXIPPOOL || ipid < 0)
4209 {
4210 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4211 ipid = -1;
4212 session[i].ip_pool_index = ipid;
4213 continue;
4214 }
4215
4216 ip_address_pool[ipid].assigned = 1;
4217 ip_address_pool[ipid].session = i;
4218 ip_address_pool[ipid].last = time_now;
4219 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4220 session[i].ip_pool_index = ipid;
4221 cache_ipmap(session[i].ip, i); // Fix the ip map.
4222 }
4223 }
4224
4225 //
4226 // Fix the address pool to match a changed session.
4227 // (usually when the master sends us an update).
4228 static void fix_address_pool(int sid)
4229 {
4230 int ipid;
4231
4232 ipid = session[sid].ip_pool_index;
4233
4234 if (ipid > ip_pool_size)
4235 return; // Ignore it. rebuild_address_pool will fix it up.
4236
4237 if (ip_address_pool[ipid].address != session[sid].ip)
4238 return; // Just ignore it. rebuild_address_pool will take care of it.
4239
4240 ip_address_pool[ipid].assigned = 1;
4241 ip_address_pool[ipid].session = sid;
4242 ip_address_pool[ipid].last = time_now;
4243 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4244 }
4245
4246 //
4247 // Add a block of addresses to the IP pool to hand out.
4248 //
4249 static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
4250 {
4251 int i;
4252 if (mask == 0)
4253 mask = 0xffffffff; // Host route only.
4254
4255 addr &= mask;
4256
4257 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4258 return ;
4259
4260 for (i = addr ;(i & mask) == addr; ++i)
4261 {
4262 if ((i & 0xff) == 0 || (i&0xff) == 255)
4263 continue; // Skip 0 and broadcast addresses.
4264
4265 ip_address_pool[ip_pool_size].address = i;
4266 ip_address_pool[ip_pool_size].assigned = 0;
4267 ++ip_pool_size;
4268 if (ip_pool_size >= MAXIPPOOL)
4269 {
4270 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4271 return;
4272 }
4273 }
4274 }
4275
4276 // Initialize the IP address pool
4277 static void initippool()
4278 {
4279 FILE *f;
4280 char *p;
4281 char buf[4096];
4282 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4283
4284 if (!(f = fopen(IPPOOLFILE, "r")))
4285 {
4286 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4287 exit(1);
4288 }
4289
4290 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4291 {
4292 char *pool = buf;
4293 buf[4095] = 0; // Force it to be zero terminated/
4294
4295 if (*buf == '#' || *buf == '\n')
4296 continue; // Skip comments / blank lines
4297 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4298 if ((p = (char *)strchr(buf, ':')))
4299 {
4300 in_addr_t src;
4301 *p = '\0';
4302 src = inet_addr(buf);
4303 if (src == INADDR_NONE)
4304 {
4305 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4306 exit(1);
4307 }
4308 // This entry is for a specific IP only
4309 if (src != config->bind_address)
4310 continue;
4311 *p = ':';
4312 pool = p+1;
4313 }
4314 if ((p = (char *)strchr(pool, '/')))
4315 {
4316 // It's a range
4317 int numbits = 0;
4318 in_addr_t start = 0, mask = 0;
4319
4320 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4321 *p++ = 0;
4322 if (!*p || !(numbits = atoi(p)))
4323 {
4324 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4325 continue;
4326 }
4327 start = ntohl(inet_addr(pool));
4328 mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
4329
4330 // Add a static route for this pool
4331 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
4332 fmtaddr(htonl(start), 0), 32 + mask);
4333
4334 routeset(0, start, mask, 0, 1);
4335
4336 add_to_ip_pool(start, mask);
4337 }
4338 else
4339 {
4340 // It's a single ip address
4341 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4342 }
4343 }
4344 fclose(f);
4345 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4346 }
4347
4348 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4349 {
4350 struct sockaddr_in snoop_addr = {0};
4351 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4352 return;
4353
4354 snoop_addr.sin_family = AF_INET;
4355 snoop_addr.sin_addr.s_addr = destination;
4356 snoop_addr.sin_port = ntohs(port);
4357
4358 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4359 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4360 htons(snoop_addr.sin_port));
4361
4362 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4363 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4364
4365 STAT(packets_snooped);
4366 }
4367
4368 static int dump_session(FILE **f, sessiont *s)
4369 {
4370 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4371 return 1;
4372
4373 if (!*f)
4374 {
4375 char filename[1024];
4376 char timestr[64];
4377 time_t now = time(NULL);
4378
4379 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4380 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4381
4382 if (!(*f = fopen(filename, "w")))
4383 {
4384 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4385 return 0;
4386 }
4387
4388 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4389 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4390 "# host: %s\n"
4391 "# endpoint: %s\n"
4392 "# time: %ld\n"
4393 "# uptime: %ld\n"
4394 "# format: username ip qos uptxoctets downrxoctets\n",
4395 hostname,
4396 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4397 now,
4398 now - basetime);
4399 }
4400
4401 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4402 fprintf(*f, "%s %s %d %u %u\n",
4403 s->user, // username
4404 fmtaddr(htonl(s->ip), 0), // ip
4405 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4406 (uint32_t) s->cin_delta, // uptxoctets
4407 (uint32_t) s->cout_delta); // downrxoctets
4408
4409 s->cin_delta = s->cout_delta = 0;
4410
4411 return 1;
4412 }
4413
4414 static void dump_acct_info(int all)
4415 {
4416 int i;
4417 FILE *f = NULL;
4418
4419
4420 CSTAT(dump_acct_info);
4421
4422 if (shut_acct_n)
4423 {
4424 for (i = 0; i < shut_acct_n; i++)
4425 dump_session(&f, &shut_acct[i]);
4426
4427 shut_acct_n = 0;
4428 }
4429
4430 if (all)
4431 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4432 dump_session(&f, &session[i]);
4433
4434 if (f)
4435 fclose(f);
4436 }
4437
4438 // Main program
4439 int main(int argc, char *argv[])
4440 {
4441 int i;
4442 int optdebug = 0;
4443 char *optconfig = CONFIGFILE;
4444
4445 time(&basetime); // start clock
4446
4447 // scan args
4448 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4449 {
4450 switch (i)
4451 {
4452 case 'd':
4453 if (fork()) exit(0);
4454 setsid();
4455 freopen("/dev/null", "r", stdin);
4456 freopen("/dev/null", "w", stdout);
4457 freopen("/dev/null", "w", stderr);
4458 break;
4459 case 'v':
4460 optdebug++;
4461 break;
4462 case 'c':
4463 optconfig = optarg;
4464 break;
4465 case 'h':
4466 snprintf(hostname, sizeof(hostname), "%s", optarg);
4467 break;
4468 default:
4469 printf("Args are:\n"
4470 "\t-d\t\tDetach from terminal\n"
4471 "\t-c <file>\tConfig file\n"
4472 "\t-h <hostname>\tForce hostname\n"
4473 "\t-v\t\tDebug\n");
4474
4475 return (0);
4476 break;
4477 }
4478 }
4479
4480 // Start the timer routine off
4481 time(&time_now);
4482 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4483
4484 initplugins();
4485 initdata(optdebug, optconfig);
4486
4487 init_cli(hostname);
4488 read_config_file();
4489 update_config();
4490 init_tbf(config->num_tbfs);
4491
4492 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4493 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4494 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4495 {
4496 struct rlimit rlim;
4497 rlim.rlim_cur = RLIM_INFINITY;
4498 rlim.rlim_max = RLIM_INFINITY;
4499 // Remove the maximum core size
4500 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4501 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4502
4503 // Make core dumps go to /tmp
4504 chdir("/tmp");
4505 }
4506
4507 if (config->scheduler_fifo)
4508 {
4509 int ret;
4510 struct sched_param params = {0};
4511 params.sched_priority = 1;
4512
4513 if (get_nprocs() < 2)
4514 {
4515 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4516 config->scheduler_fifo = 0;
4517 }
4518 else
4519 {
4520 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4521 {
4522 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4523 }
4524 else
4525 {
4526 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4527 config->scheduler_fifo = 0;
4528 }
4529 }
4530 }
4531
4532 /* Set up the cluster communications port. */
4533 if (cluster_init() < 0)
4534 exit(1);
4535
4536 inittun();
4537 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4538
4539 initudp();
4540 initrad();
4541 initippool();
4542
4543 // seed prng
4544 {
4545 unsigned seed = time_now ^ getpid();
4546 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4547 srand(seed);
4548 }
4549
4550 signal(SIGHUP, sighup_handler);
4551 signal(SIGCHLD, sigchild_handler);
4552 signal(SIGTERM, shutdown_handler);
4553 signal(SIGINT, shutdown_handler);
4554 signal(SIGQUIT, shutdown_handler);
4555
4556 // Prevent us from getting paged out
4557 if (config->lock_pages)
4558 {
4559 if (!mlockall(MCL_CURRENT))
4560 LOG(1, 0, 0, "Locking pages into memory\n");
4561 else
4562 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4563 }
4564
4565 mainloop();
4566
4567 /* remove plugins (so cleanup code gets run) */
4568 plugins_done();
4569
4570 // Remove the PID file if we wrote it
4571 if (config->wrote_pid && *config->pid_file == '/')
4572 unlink(config->pid_file);
4573
4574 /* kill CLI children */
4575 signal(SIGTERM, SIG_IGN);
4576 kill(0, SIGTERM);
4577 return 0;
4578 }
4579
4580 static void sighup_handler(int sig)
4581 {
4582 main_reload++;
4583 }
4584
4585 static void shutdown_handler(int sig)
4586 {
4587 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4588 }
4589
4590 static void sigchild_handler(int sig)
4591 {
4592 while (waitpid(-1, NULL, WNOHANG) > 0)
4593 ;
4594 }
4595
4596 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4597 {
4598 MD5_CTX ctx;
4599 *challenge_response = NULL;
4600
4601 if (!*config->l2tp_secret)
4602 {
4603 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4604 return;
4605 }
4606
4607 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4608
4609 *challenge_response = calloc(17, 1);
4610
4611 MD5_Init(&ctx);
4612 MD5_Update(&ctx, &id, 1);
4613 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4614 MD5_Update(&ctx, challenge, challenge_length);
4615 MD5_Final(*challenge_response, &ctx);
4616
4617 return;
4618 }
4619
4620 static int facility_value(char *name)
4621 {
4622 int i;
4623 for (i = 0; facilitynames[i].c_name; i++)
4624 {
4625 if (strcmp(facilitynames[i].c_name, name) == 0)
4626 return facilitynames[i].c_val;
4627 }
4628 return 0;
4629 }
4630
4631 static void update_config()
4632 {
4633 int i;
4634 char *p;
4635 static int timeout = 0;
4636 static int interval = 0;
4637
4638 // Update logging
4639 closelog();
4640 syslog_log = 0;
4641 if (log_stream)
4642 {
4643 if (log_stream != stderr)
4644 fclose(log_stream);
4645
4646 log_stream = NULL;
4647 }
4648
4649 if (*config->log_filename)
4650 {
4651 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4652 {
4653 char *p = config->log_filename + 7;
4654 if (*p)
4655 {
4656 openlog("l2tpns", LOG_PID, facility_value(p));
4657 syslog_log = 1;
4658 }
4659 }
4660 else if (strchr(config->log_filename, '/') == config->log_filename)
4661 {
4662 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4663 {
4664 fseek(log_stream, 0, SEEK_END);
4665 setbuf(log_stream, NULL);
4666 }
4667 else
4668 {
4669 log_stream = stderr;
4670 setbuf(log_stream, NULL);
4671 }
4672 }
4673 }
4674 else
4675 {
4676 log_stream = stderr;
4677 setbuf(log_stream, NULL);
4678 }
4679
4680 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4681 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4682
4683 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4684 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4685 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4686
4687 // reset MRU/MSS globals
4688 MRU = config->l2tp_mtu - L2TP_HDRS;
4689 if (MRU > PPPoE_MRU)
4690 MRU = PPPoE_MRU;
4691
4692 MSS = MRU - TCP_HDRS;
4693
4694 // Update radius
4695 config->numradiusservers = 0;
4696 for (i = 0; i < MAXRADSERVER; i++)
4697 if (config->radiusserver[i])
4698 {
4699 config->numradiusservers++;
4700 // Set radius port: if not set, take the port from the
4701 // first radius server. For the first radius server,
4702 // take the #defined default value from l2tpns.h
4703
4704 // test twice, In case someone works with
4705 // a secondary radius server without defining
4706 // a primary one, this will work even then.
4707 if (i > 0 && !config->radiusport[i])
4708 config->radiusport[i] = config->radiusport[i-1];
4709 if (!config->radiusport[i])
4710 config->radiusport[i] = RADPORT;
4711 }
4712
4713 if (!config->numradiusservers)
4714 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4715
4716 // parse radius_authtypes_s
4717 config->radius_authtypes = config->radius_authprefer = 0;
4718 p = config->radius_authtypes_s;
4719 while (p && *p)
4720 {
4721 char *s = strpbrk(p, " \t,");
4722 int type = 0;
4723
4724 if (s)
4725 {
4726 *s++ = 0;
4727 while (*s == ' ' || *s == '\t')
4728 s++;
4729
4730 if (!*s)
4731 s = 0;
4732 }
4733
4734 if (!strncasecmp("chap", p, strlen(p)))
4735 type = AUTHCHAP;
4736 else if (!strncasecmp("pap", p, strlen(p)))
4737 type = AUTHPAP;
4738 else
4739 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4740
4741 config->radius_authtypes |= type;
4742 if (!config->radius_authprefer)
4743 config->radius_authprefer = type;
4744
4745 p = s;
4746 }
4747
4748 if (!config->radius_authtypes)
4749 {
4750 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4751 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4752 }
4753
4754 // normalise radius_authtypes_s
4755 if (config->radius_authprefer == AUTHPAP)
4756 {
4757 strcpy(config->radius_authtypes_s, "pap");
4758 if (config->radius_authtypes & AUTHCHAP)
4759 strcat(config->radius_authtypes_s, ", chap");
4760 }
4761 else
4762 {
4763 strcpy(config->radius_authtypes_s, "chap");
4764 if (config->radius_authtypes & AUTHPAP)
4765 strcat(config->radius_authtypes_s, ", pap");
4766 }
4767
4768 if (!config->radius_dae_port)
4769 config->radius_dae_port = DAEPORT;
4770
4771 // re-initialise the random number source
4772 initrandom(config->random_device);
4773
4774 // Update plugins
4775 for (i = 0; i < MAXPLUGINS; i++)
4776 {
4777 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4778 continue;
4779
4780 if (*config->plugins[i])
4781 {
4782 // Plugin added
4783 add_plugin(config->plugins[i]);
4784 }
4785 else if (*config->old_plugins[i])
4786 {
4787 // Plugin removed
4788 remove_plugin(config->old_plugins[i]);
4789 }
4790 }
4791
4792 // Guest change
4793 guest_accounts_num = 0;
4794 char *p2 = config->guest_user;
4795 while (p2 && *p2)
4796 {
4797 char *s = strpbrk(p2, " \t,");
4798 if (s)
4799 {
4800 *s++ = 0;
4801 while (*s == ' ' || *s == '\t')
4802 s++;
4803
4804 if (!*s)
4805 s = 0;
4806 }
4807
4808 strcpy(guest_users[guest_accounts_num], p2);
4809 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
4810 guest_accounts_num++;
4811 p2 = s;
4812 }
4813 // Rebuild the guest_user array
4814 strcpy(config->guest_user, "");
4815 int ui = 0;
4816 for (ui=0; ui<guest_accounts_num; ui++)
4817 {
4818 strcat(config->guest_user, guest_users[ui]);
4819 if (ui<guest_accounts_num-1)
4820 {
4821 strcat(config->guest_user, ",");
4822 }
4823 }
4824
4825
4826 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
4827 if (!config->multi_read_count) config->multi_read_count = 10;
4828 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
4829 if (!*config->cluster_interface)
4830 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
4831
4832 if (!config->cluster_hb_interval)
4833 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
4834
4835 if (!config->cluster_hb_timeout)
4836 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
4837
4838 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
4839 {
4840 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4841 // late, ensure we're sufficiently larger than that
4842 int t = 4 * config->cluster_hb_interval + 11;
4843
4844 if (config->cluster_hb_timeout < t)
4845 {
4846 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
4847 config->cluster_hb_timeout = t;
4848 }
4849
4850 // Push timing changes to the slaves immediately if we're the master
4851 if (config->cluster_iam_master)
4852 cluster_heartbeat();
4853
4854 interval = config->cluster_hb_interval;
4855 timeout = config->cluster_hb_timeout;
4856 }
4857
4858 // Write PID file
4859 if (*config->pid_file == '/' && !config->wrote_pid)
4860 {
4861 FILE *f;
4862 if ((f = fopen(config->pid_file, "w")))
4863 {
4864 fprintf(f, "%d\n", getpid());
4865 fclose(f);
4866 config->wrote_pid = 1;
4867 }
4868 else
4869 {
4870 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
4871 }
4872 }
4873 }
4874
4875 static void read_config_file()
4876 {
4877 FILE *f;
4878
4879 if (!config->config_file) return;
4880 if (!(f = fopen(config->config_file, "r")))
4881 {
4882 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
4883 return;
4884 }
4885
4886 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
4887 cli_do_file(f);
4888 LOG(3, 0, 0, "Done reading config file\n");
4889 fclose(f);
4890 }
4891
4892 int sessionsetup(sessionidt s, tunnelidt t)
4893 {
4894 // A session now exists, set it up
4895 in_addr_t ip;
4896 char *user;
4897 sessionidt i;
4898 int r;
4899
4900 CSTAT(sessionsetup);
4901
4902 LOG(3, s, t, "Doing session setup for session\n");
4903
4904 // Join a bundle if the MRRU option is accepted
4905 if(session[s].mrru > 0 && session[s].bundle == 0)
4906 {
4907 LOG(3, s, t, "This session can be part of multilink bundle\n");
4908 if (join_bundle(s) > 0)
4909 cluster_send_bundle(session[s].bundle);
4910 else
4911 {
4912 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
4913 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
4914 return 0;
4915 }
4916 }
4917
4918 if (!session[s].ip)
4919 {
4920 assign_ip_address(s);
4921 if (!session[s].ip)
4922 {
4923 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
4924 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
4925 return 0;
4926 }
4927 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
4928 fmtaddr(htonl(session[s].ip), 0));
4929 }
4930
4931
4932 // Make sure this is right
4933 session[s].tunnel = t;
4934
4935 // zap old sessions with same IP and/or username
4936 // Don't kill gardened sessions - doing so leads to a DoS
4937 // from someone who doesn't need to know the password
4938 {
4939 ip = session[s].ip;
4940 user = session[s].user;
4941 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4942 {
4943 if (i == s) continue;
4944 if (!session[s].opened) continue;
4945 // Allow duplicate sessions for multilink ones of the same bundle.
4946 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
4947 continue;
4948 if (ip == session[i].ip)
4949 {
4950 sessionkill(i, "Duplicate IP address");
4951 continue;
4952 }
4953
4954 if (config->allow_duplicate_users) continue;
4955 if (session[s].walled_garden || session[i].walled_garden) continue;
4956 // Guest change
4957 int found = 0;
4958 int gu;
4959 for (gu = 0; gu < guest_accounts_num; gu++)
4960 {
4961 if (!strcasecmp(user, guest_users[gu]))
4962 {
4963 found = 1;
4964 break;
4965 }
4966 }
4967 if (found) continue;
4968
4969 // Drop the new session in case of duplicate sessionss, not the old one.
4970 if (!strcasecmp(user, session[i].user))
4971 sessionkill(i, "Duplicate session for users");
4972 }
4973 }
4974
4975 // no need to set a route for the same IP address of the bundle
4976 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
4977 {
4978 int routed = 0;
4979
4980 // Add the route for this session.
4981 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
4982 {
4983 if ((session[s].ip & session[s].route[r].mask) ==
4984 (session[s].route[r].ip & session[s].route[r].mask))
4985 routed++;
4986
4987 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
4988 }
4989
4990 // Static IPs need to be routed if not already
4991 // convered by a Framed-Route. Anything else is part
4992 // of the IP address pool and is already routed, it
4993 // just needs to be added to the IP cache.
4994 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4995 if (session[s].ip_pool_index == -1) // static ip
4996 {
4997 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
4998 }
4999 else
5000 cache_ipmap(session[s].ip, s);
5001 }
5002
5003 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5004 lcp_open(s, t); // transition to Network phase and send initial IPCP
5005
5006 // Run the plugin's against this new session.
5007 {
5008 struct param_new_session data = { &tunnel[t], &session[s] };
5009 run_plugins(PLUGIN_NEW_SESSION, &data);
5010 }
5011
5012 // Allocate TBFs if throttled
5013 if (session[s].throttle_in || session[s].throttle_out)
5014 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5015
5016 session[s].last_packet = session[s].last_data = time_now;
5017
5018 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5019 fmtaddr(htonl(session[s].ip), 0),
5020 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5021
5022 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5023
5024 return 1; // RADIUS OK and IP allocated, done...
5025 }
5026
5027 //
5028 // This session just got dropped on us by the master or something.
5029 // Make sure our tables up up to date...
5030 //
5031 int load_session(sessionidt s, sessiont *new)
5032 {
5033 int i;
5034 int newip = 0;
5035
5036 // Sanity checks.
5037 if (new->ip_pool_index >= MAXIPPOOL ||
5038 new->tunnel >= MAXTUNNEL)
5039 {
5040 LOG(0, s, 0, "Strange session update received!\n");
5041 // FIXME! What to do here?
5042 return 0;
5043 }
5044
5045 //
5046 // Ok. All sanity checks passed. Now we're committed to
5047 // loading the new session.
5048 //
5049
5050 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5051
5052 // See if routes/ip cache need updating
5053 if (new->ip != session[s].ip)
5054 newip++;
5055
5056 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5057 if (new->route[i].ip != session[s].route[i].ip ||
5058 new->route[i].mask != session[s].route[i].mask)
5059 newip++;
5060
5061 // needs update
5062 if (newip)
5063 {
5064 int routed = 0;
5065
5066 // remove old routes...
5067 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5068 {
5069 if ((session[s].ip & session[s].route[i].mask) ==
5070 (session[s].route[i].ip & session[s].route[i].mask))
5071 routed++;
5072
5073 routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
5074 }
5075
5076 // ...ip
5077 if (session[s].ip)
5078 {
5079 if (session[s].ip_pool_index == -1) // static IP
5080 {
5081 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5082 }
5083 else // It's part of the IP pool, remove it manually.
5084 uncache_ipmap(session[s].ip);
5085 }
5086
5087 routed = 0;
5088
5089 // add new routes...
5090 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5091 {
5092 if ((new->ip & new->route[i].mask) ==
5093 (new->route[i].ip & new->route[i].mask))
5094 routed++;
5095
5096 routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
5097 }
5098
5099 // ...ip
5100 if (new->ip)
5101 {
5102 // If there's a new one, add it.
5103 if (new->ip_pool_index == -1)
5104 {
5105 if (!routed) routeset(s, new->ip, 0, 0, 1);
5106 }
5107 else
5108 cache_ipmap(new->ip, s);
5109 }
5110 }
5111
5112 // check v6 routing
5113 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5114 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5115
5116 // check filters
5117 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5118 {
5119 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5120 new->filter_in = 0;
5121 }
5122
5123 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5124 {
5125 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5126 new->filter_out = 0;
5127 }
5128
5129 if (new->filter_in != session[s].filter_in)
5130 {
5131 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5132 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5133 }
5134
5135 if (new->filter_out != session[s].filter_out)
5136 {
5137 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5138 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5139 }
5140
5141 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5142 // for walking the sessions to forward byte counts to the master.
5143 config->cluster_highest_sessionid = s;
5144
5145 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5146
5147 // Do fixups into address pool.
5148 if (new->ip_pool_index != -1)
5149 fix_address_pool(s);
5150
5151 return 1;
5152 }
5153
5154 static void initplugins()
5155 {
5156 int i;
5157
5158 loaded_plugins = ll_init();
5159 // Initialize the plugins to nothing
5160 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5161 plugins[i] = ll_init();
5162 }
5163
5164 static void *open_plugin(char *plugin_name, int load)
5165 {
5166 char path[256] = "";
5167
5168 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5169 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5170 return dlopen(path, RTLD_NOW);
5171 }
5172
5173 // plugin callback to get a config value
5174 static void *getconfig(char *key, enum config_typet type)
5175 {
5176 int i;
5177
5178 for (i = 0; config_values[i].key; i++)
5179 {
5180 if (!strcmp(config_values[i].key, key))
5181 {
5182 if (config_values[i].type == type)
5183 return ((void *) config) + config_values[i].offset;
5184
5185 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5186 key, type, config_values[i].type);
5187
5188 return 0;
5189 }
5190 }
5191
5192 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5193 return 0;
5194 }
5195
5196 static int add_plugin(char *plugin_name)
5197 {
5198 static struct pluginfuncs funcs = {
5199 _log,
5200 _log_hex,
5201 fmtaddr,
5202 sessionbyuser,
5203 sessiontbysessionidt,
5204 sessionidtbysessiont,
5205 radiusnew,
5206 radiussend,
5207 getconfig,
5208 sessionshutdown,
5209 sessionkill,
5210 throttle_session,
5211 cluster_send_session,
5212 };
5213
5214 void *p = open_plugin(plugin_name, 1);
5215 int (*initfunc)(struct pluginfuncs *);
5216 int i;
5217
5218 if (!p)
5219 {
5220 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5221 return -1;
5222 }
5223
5224 if (ll_contains(loaded_plugins, p))
5225 {
5226 dlclose(p);
5227 return 0; // already loaded
5228 }
5229
5230 {
5231 int *v = dlsym(p, "plugin_api_version");
5232 if (!v || *v != PLUGIN_API_VERSION)
5233 {
5234 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5235 dlclose(p);
5236 return -1;
5237 }
5238 }
5239
5240 if ((initfunc = dlsym(p, "plugin_init")))
5241 {
5242 if (!initfunc(&funcs))
5243 {
5244 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5245 dlclose(p);
5246 return -1;
5247 }
5248 }
5249
5250 ll_push(loaded_plugins, p);
5251
5252 for (i = 0; i < max_plugin_functions; i++)
5253 {
5254 void *x;
5255 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5256 {
5257 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5258 ll_push(plugins[i], x);
5259 }
5260 }
5261
5262 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5263 return 1;
5264 }
5265
5266 static void run_plugin_done(void *plugin)
5267 {
5268 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5269
5270 if (donefunc)
5271 donefunc();
5272 }
5273
5274 static int remove_plugin(char *plugin_name)
5275 {
5276 void *p = open_plugin(plugin_name, 0);
5277 int loaded = 0;
5278
5279 if (!p)
5280 return -1;
5281
5282 if (ll_contains(loaded_plugins, p))
5283 {
5284 int i;
5285 for (i = 0; i < max_plugin_functions; i++)
5286 {
5287 void *x;
5288 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5289 ll_delete(plugins[i], x);
5290 }
5291
5292 ll_delete(loaded_plugins, p);
5293 run_plugin_done(p);
5294 loaded = 1;
5295 }
5296
5297 dlclose(p);
5298 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5299 return loaded;
5300 }
5301
5302 int run_plugins(int plugin_type, void *data)
5303 {
5304 int (*func)(void *data);
5305
5306 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5307 return PLUGIN_RET_ERROR;
5308
5309 ll_reset(plugins[plugin_type]);
5310 while ((func = ll_next(plugins[plugin_type])))
5311 {
5312 int r = func(data);
5313
5314 if (r != PLUGIN_RET_OK)
5315 return r; // stop here
5316 }
5317
5318 return PLUGIN_RET_OK;
5319 }
5320
5321 static void plugins_done()
5322 {
5323 void *p;
5324
5325 ll_reset(loaded_plugins);
5326 while ((p = ll_next(loaded_plugins)))
5327 run_plugin_done(p);
5328 }
5329
5330 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5331 {
5332 struct nsctl request;
5333 struct nsctl response;
5334 int type = unpack_control(&request, buf, len);
5335 int r;
5336 void *p;
5337
5338 if (log_stream && config->debug >= 4)
5339 {
5340 if (type < 0)
5341 {
5342 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5343 fmtaddr(addr->sin_addr.s_addr, 0), type);
5344 }
5345 else
5346 {
5347 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5348 dump_control(&request, log_stream);
5349 }
5350 }
5351
5352 switch (type)
5353 {
5354 case NSCTL_REQ_LOAD:
5355 if (request.argc != 1)
5356 {
5357 response.type = NSCTL_RES_ERR;
5358 response.argc = 1;
5359 response.argv[0] = "name of plugin required";
5360 }
5361 else if ((r = add_plugin(request.argv[0])) < 1)
5362 {
5363 response.type = NSCTL_RES_ERR;
5364 response.argc = 1;
5365 response.argv[0] = !r
5366 ? "plugin already loaded"
5367 : "error loading plugin";
5368 }
5369 else
5370 {
5371 response.type = NSCTL_RES_OK;
5372 response.argc = 0;
5373 }
5374
5375 break;
5376
5377 case NSCTL_REQ_UNLOAD:
5378 if (request.argc != 1)
5379 {
5380 response.type = NSCTL_RES_ERR;
5381 response.argc = 1;
5382 response.argv[0] = "name of plugin required";
5383 }
5384 else if ((r = remove_plugin(request.argv[0])) < 1)
5385 {
5386 response.type = NSCTL_RES_ERR;
5387 response.argc = 1;
5388 response.argv[0] = !r
5389 ? "plugin not loaded"
5390 : "plugin not found";
5391 }
5392 else
5393 {
5394 response.type = NSCTL_RES_OK;
5395 response.argc = 0;
5396 }
5397
5398 break;
5399
5400 case NSCTL_REQ_HELP:
5401 response.type = NSCTL_RES_OK;
5402 response.argc = 0;
5403
5404 ll_reset(loaded_plugins);
5405 while ((p = ll_next(loaded_plugins)))
5406 {
5407 char **help = dlsym(p, "plugin_control_help");
5408 while (response.argc < 0xff && help && *help)
5409 response.argv[response.argc++] = *help++;
5410 }
5411
5412 break;
5413
5414 case NSCTL_REQ_CONTROL:
5415 {
5416 struct param_control param = {
5417 config->cluster_iam_master,
5418 request.argc,
5419 request.argv,
5420 0,
5421 NULL,
5422 };
5423
5424 int r = run_plugins(PLUGIN_CONTROL, &param);
5425
5426 if (r == PLUGIN_RET_ERROR)
5427 {
5428 response.type = NSCTL_RES_ERR;
5429 response.argc = 1;
5430 response.argv[0] = param.additional
5431 ? param.additional
5432 : "error returned by plugin";
5433 }
5434 else if (r == PLUGIN_RET_NOTMASTER)
5435 {
5436 static char msg[] = "must be run on master: 000.000.000.000";
5437
5438 response.type = NSCTL_RES_ERR;
5439 response.argc = 1;
5440 if (config->cluster_master_address)
5441 {
5442 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5443 response.argv[0] = msg;
5444 }
5445 else
5446 {
5447 response.argv[0] = "must be run on master: none elected";
5448 }
5449 }
5450 else if (!(param.response & NSCTL_RESPONSE))
5451 {
5452 response.type = NSCTL_RES_ERR;
5453 response.argc = 1;
5454 response.argv[0] = param.response
5455 ? "unrecognised response value from plugin"
5456 : "unhandled action";
5457 }
5458 else
5459 {
5460 response.type = param.response;
5461 response.argc = 0;
5462 if (param.additional)
5463 {
5464 response.argc = 1;
5465 response.argv[0] = param.additional;
5466 }
5467 }
5468 }
5469
5470 break;
5471
5472 default:
5473 response.type = NSCTL_RES_ERR;
5474 response.argc = 1;
5475 response.argv[0] = "error unpacking control packet";
5476 }
5477
5478 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5479 if (!buf)
5480 {
5481 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5482 return;
5483 }
5484
5485 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5486 if (r > 0)
5487 {
5488 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5489 if (log_stream && config->debug >= 4)
5490 {
5491 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5492 dump_control(&response, log_stream);
5493 }
5494 }
5495 else
5496 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5497 fmtaddr(addr->sin_addr.s_addr, 0), r);
5498
5499 free(buf);
5500 }
5501
5502 static tunnelidt new_tunnel()
5503 {
5504 tunnelidt i;
5505 for (i = 1; i < MAXTUNNEL; i++)
5506 {
5507 if (tunnel[i].state == TUNNELFREE)
5508 {
5509 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5510 if (i > config->cluster_highest_tunnelid)
5511 config->cluster_highest_tunnelid = i;
5512 return i;
5513 }
5514 }
5515 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5516 return 0;
5517 }
5518
5519 //
5520 // We're becoming the master. Do any required setup..
5521 //
5522 // This is principally telling all the plugins that we're
5523 // now a master, and telling them about all the sessions
5524 // that are active too..
5525 //
5526 void become_master(void)
5527 {
5528 int s, i;
5529 static struct event_data d[RADIUS_FDS];
5530 struct epoll_event e;
5531
5532 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5533
5534 // running a bunch of iptables commands is slow and can cause
5535 // the master to drop tunnels on takeover--kludge around the
5536 // problem by forking for the moment (note: race)
5537 if (!fork_and_close())
5538 {
5539 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5540 {
5541 if (!session[s].opened) // Not an in-use session.
5542 continue;
5543
5544 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5545 }
5546 exit(0);
5547 }
5548
5549 // add radius fds
5550 e.events = EPOLLIN;
5551 for (i = 0; i < RADIUS_FDS; i++)
5552 {
5553 d[i].type = FD_TYPE_RADIUS;
5554 d[i].index = i;
5555 e.data.ptr = &d[i];
5556
5557 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5558 }
5559 }
5560
5561 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5562 {
5563 int s, i;
5564 int count = 0;
5565 int buckets[64];
5566
5567 if (CLI_HELP_REQUESTED)
5568 return CLI_HELP_NO_ARGS;
5569
5570 time(&time_now);
5571 for (i = 0; i < 64;++i) buckets[i] = 0;
5572
5573 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5574 {
5575 int idle;
5576 if (!session[s].opened)
5577 continue;
5578
5579 idle = time_now - session[s].last_data;
5580 idle /= 5 ; // In multiples of 5 seconds.
5581 if (idle < 0)
5582 idle = 0;
5583 if (idle > 63)
5584 idle = 63;
5585
5586 ++count;
5587 ++buckets[idle];
5588 }
5589
5590 for (i = 0; i < 63; ++i)
5591 {
5592 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5593 }
5594 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5595 cli_print(cli, "%d total sessions open.", count);
5596 return CLI_OK;
5597 }
5598
5599 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5600 {
5601 int s, i;
5602 int count = 0;
5603 int buckets[64];
5604
5605 if (CLI_HELP_REQUESTED)
5606 return CLI_HELP_NO_ARGS;
5607
5608 time(&time_now);
5609 for (i = 0; i < 64;++i) buckets[i] = 0;
5610
5611 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5612 {
5613 int open = 0, d;
5614 if (!session[s].opened)
5615 continue;
5616
5617 d = time_now - session[s].opened;
5618 if (d < 0)
5619 d = 0;
5620 while (d > 1 && open < 32)
5621 {
5622 ++open;
5623 d >>= 1; // half.
5624 }
5625 ++count;
5626 ++buckets[open];
5627 }
5628
5629 s = 1;
5630 for (i = 0; i < 30; ++i)
5631 {
5632 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5633 s <<= 1;
5634 }
5635 cli_print(cli, "%d total sessions open.", count);
5636 return CLI_OK;
5637 }
5638
5639 /* Unhide an avp.
5640 *
5641 * This unencodes the AVP using the L2TP secret and the previously
5642 * stored random vector. It overwrites the hidden data with the
5643 * unhidden AVP subformat.
5644 */
5645 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5646 {
5647 MD5_CTX ctx;
5648 uint8_t digest[16];
5649 uint8_t *last;
5650 size_t d = 0;
5651 uint16_t m = htons(type);
5652
5653 // Compute initial pad
5654 MD5_Init(&ctx);
5655 MD5_Update(&ctx, (unsigned char *) &m, 2);
5656 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5657 MD5_Update(&ctx, vector, vec_len);
5658 MD5_Final(digest, &ctx);
5659
5660 // pointer to last decoded 16 octets
5661 last = value;
5662
5663 while (len > 0)
5664 {
5665 // calculate a new pad based on the last decoded block
5666 if (d >= sizeof(digest))
5667 {
5668 MD5_Init(&ctx);
5669 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5670 MD5_Update(&ctx, last, sizeof(digest));
5671 MD5_Final(digest, &ctx);
5672
5673 d = 0;
5674 last = value;
5675 }
5676
5677 *value++ ^= digest[d++];
5678 len--;
5679 }
5680 }
5681
5682 int find_filter(char const *name, size_t len)
5683 {
5684 int free = -1;
5685 int i;
5686
5687 for (i = 0; i < MAXFILTER; i++)
5688 {
5689 if (!*ip_filters[i].name)
5690 {
5691 if (free < 0)
5692 free = i;
5693
5694 continue;
5695 }
5696
5697 if (strlen(ip_filters[i].name) != len)
5698 continue;
5699
5700 if (!strncmp(ip_filters[i].name, name, len))
5701 return i;
5702 }
5703
5704 return free;
5705 }
5706
5707 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5708 {
5709 switch (p->op)
5710 {
5711 case FILTER_PORT_OP_EQ: return port == p->port;
5712 case FILTER_PORT_OP_NEQ: return port != p->port;
5713 case FILTER_PORT_OP_GT: return port > p->port;
5714 case FILTER_PORT_OP_LT: return port < p->port;
5715 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5716 }
5717
5718 return 0;
5719 }
5720
5721 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5722 {
5723 switch (op)
5724 {
5725 case FILTER_FLAG_OP_ANY:
5726 return (flags & sflags) || (~flags & cflags);
5727
5728 case FILTER_FLAG_OP_ALL:
5729 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5730
5731 case FILTER_FLAG_OP_EST:
5732 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5733 }
5734
5735 return 0;
5736 }
5737
5738 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5739 {
5740 uint16_t frag_offset;
5741 uint8_t proto;
5742 in_addr_t src_ip;
5743 in_addr_t dst_ip;
5744 uint16_t src_port = 0;
5745 uint16_t dst_port = 0;
5746 uint8_t flags = 0;
5747 ip_filter_rulet *rule;
5748
5749 if (len < 20) // up to end of destination address
5750 return 0;
5751
5752 if ((*buf >> 4) != 4) // IPv4
5753 return 0;
5754
5755 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5756 proto = buf[9];
5757 src_ip = *(in_addr_t *) (buf + 12);
5758 dst_ip = *(in_addr_t *) (buf + 16);
5759
5760 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5761 {
5762 int l = (buf[0] & 0xf) * 4; // length of IP header
5763 if (len < l + 4) // ports
5764 return 0;
5765
5766 src_port = ntohs(*(uint16_t *) (buf + l));
5767 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5768 if (proto == IPPROTO_TCP)
5769 {
5770 if (len < l + 14) // flags
5771 return 0;
5772
5773 flags = buf[l + 13] & 0x3f;
5774 }
5775 }
5776
5777 for (rule = ip_filters[filter].rules; rule->action; rule++)
5778 {
5779 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5780 continue;
5781
5782 if (rule->src_wild != INADDR_BROADCAST &&
5783 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5784 continue;
5785
5786 if (rule->dst_wild != INADDR_BROADCAST &&
5787 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
5788 continue;
5789
5790 if (frag_offset)
5791 {
5792 // layer 4 deny rules are skipped
5793 if (rule->action == FILTER_ACTION_DENY &&
5794 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
5795 continue;
5796 }
5797 else
5798 {
5799 if (rule->frag)
5800 continue;
5801
5802 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
5803 {
5804 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
5805 continue;
5806
5807 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
5808 continue;
5809
5810 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
5811 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
5812 continue;
5813 }
5814 }
5815
5816 // matched
5817 rule->counter++;
5818 return rule->action == FILTER_ACTION_PERMIT;
5819 }
5820
5821 // default deny
5822 return 0;
5823 }