8fdcb53c9022de41b82392488163d5021f1a897f
[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 1.176 2011/01/20 12:48:40 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 session[s].die = TIME + 150; // Clean up in 15 seconds
1734 }
1735
1736 if (session[s].ip && !walled_garden && !session[s].die)
1737 {
1738 // RADIUS Stop message
1739 uint16_t r = radiusnew(s);
1740 if (r)
1741 {
1742 // stop, if not already trying
1743 if (radius[r].state != RADIUSSTOP)
1744 {
1745 radius[r].term_cause = term_cause;
1746 radius[r].term_msg = reason;
1747 radiussend(r, RADIUSSTOP);
1748 }
1749 }
1750 else
1751 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1752
1753 // Save counters to dump to accounting file
1754 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1755 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1756 }
1757
1758 if (session[s].ip)
1759 { // IP allocated, clear and unroute
1760 int r;
1761 int routed = 0;
1762 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1763 {
1764 if ((session[s].ip & session[s].route[r].mask) ==
1765 (session[s].route[r].ip & session[s].route[r].mask))
1766 routed++;
1767
1768 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
1769 session[s].route[r].ip = 0;
1770 }
1771
1772 if (session[s].ip_pool_index == -1) // static ip
1773 {
1774 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1775 session[s].ip = 0;
1776 }
1777 else
1778 free_ip_address(s);
1779
1780 // unroute IPv6, if setup
1781 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1782 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1783
1784 if (b)
1785 {
1786 // This session was part of a bundle
1787 bundle[b].num_of_links--;
1788 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1789 if(bundle[b].num_of_links == 0)
1790 {
1791 bundleclear(b);
1792 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1793 }
1794 else
1795 {
1796 // Adjust the members array to accomodate the new change
1797 uint8_t mem_num = 0;
1798 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1799 if(bundle[b].members[bundle[b].num_of_links] != s)
1800 {
1801 uint8_t ml;
1802 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1803 if(bundle[b].members[ml] == s)
1804 {
1805 mem_num = ml;
1806 break;
1807 }
1808 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1809 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
1810 }
1811 }
1812 cluster_send_bundle(b);
1813 }
1814 }
1815
1816 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
1817 throttle_session(s, 0, 0);
1818
1819 if (cdn_result)
1820 { // Send CDN
1821 controlt *c = controlnew(14); // sending CDN
1822 if (cdn_error)
1823 {
1824 uint8_t buf[4];
1825 *(uint16_t *) buf = htons(cdn_result);
1826 *(uint16_t *) (buf+2) = htons(cdn_error);
1827 controlb(c, 1, buf, 4, 1);
1828 }
1829 else
1830 control16(c, 1, cdn_result, 1);
1831
1832 control16(c, 14, s, 1); // assigned session (our end)
1833 controladd(c, session[s].far, session[s].tunnel); // send the message
1834 }
1835
1836 // update filter refcounts
1837 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
1838 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
1839
1840 // clear PPP state
1841 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
1842 sess_local[s].lcp.restart = 0;
1843 sess_local[s].ipcp.restart = 0;
1844 sess_local[s].ipv6cp.restart = 0;
1845 sess_local[s].ccp.restart = 0;
1846
1847 cluster_send_session(s);
1848 }
1849
1850 void sendipcp(sessionidt s, tunnelidt t)
1851 {
1852 uint8_t buf[MAXETHER];
1853 uint8_t *q;
1854
1855 CSTAT(sendipcp);
1856 LOG(3, s, t, "IPCP: send ConfigReq\n");
1857
1858 if (!session[s].unique_id)
1859 {
1860 if (!++last_id) ++last_id; // skip zero
1861 session[s].unique_id = last_id;
1862 }
1863
1864 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
1865 if (!q) return;
1866
1867 *q = ConfigReq;
1868 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
1869 *(uint16_t *) (q + 2) = htons(10); // packet length
1870 q[4] = 3; // ip address option
1871 q[5] = 6; // option length
1872 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
1873 config->bind_address ? config->bind_address :
1874 my_address; // send my IP
1875
1876 tunnelsend(buf, 10 + (q - buf), t); // send it
1877 restart_timer(s, ipcp);
1878 }
1879
1880 void sendipv6cp(sessionidt s, tunnelidt t)
1881 {
1882 uint8_t buf[MAXETHER];
1883 uint8_t *q;
1884
1885 CSTAT(sendipv6cp);
1886 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
1887
1888 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
1889 if (!q) return;
1890
1891 *q = ConfigReq;
1892 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
1893 // only send one type
1894 // of request
1895 *(uint16_t *) (q + 2) = htons(14);
1896 q[4] = 1; // interface identifier option
1897 q[5] = 10; // option length
1898 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
1899 *(uint32_t *) (q + 10) = 0;
1900 q[13] = 1;
1901
1902 tunnelsend(buf, 14 + (q - buf), t); // send it
1903 restart_timer(s, ipv6cp);
1904 }
1905
1906 static void sessionclear(sessionidt s)
1907 {
1908 memset(&session[s], 0, sizeof(session[s]));
1909 memset(&sess_local[s], 0, sizeof(sess_local[s]));
1910 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
1911
1912 session[s].tunnel = T_FREE; // Mark it as free.
1913 session[s].next = sessionfree;
1914 sessionfree = s;
1915 }
1916
1917 // kill a session now
1918 void sessionkill(sessionidt s, char *reason)
1919 {
1920 CSTAT(sessionkill);
1921
1922 if (!session[s].opened) // not alive
1923 return;
1924
1925 if (session[s].next)
1926 {
1927 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
1928 return;
1929 }
1930
1931 if (!session[s].die)
1932 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
1933
1934 if (sess_local[s].radius)
1935 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
1936
1937 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
1938 sessionclear(s);
1939 cluster_send_session(s);
1940 }
1941
1942 static void tunnelclear(tunnelidt t)
1943 {
1944 if (!t) return;
1945 memset(&tunnel[t], 0, sizeof(tunnel[t]));
1946 tunnel[t].state = TUNNELFREE;
1947 }
1948
1949 static void bundleclear(bundleidt b)
1950 {
1951 if (!b) return;
1952 memset(&bundle[b], 0, sizeof(bundle[b]));
1953 bundle[b].state = BUNDLEFREE;
1954 }
1955
1956 // kill a tunnel now
1957 static void tunnelkill(tunnelidt t, char *reason)
1958 {
1959 sessionidt s;
1960 controlt *c;
1961
1962 CSTAT(tunnelkill);
1963
1964 tunnel[t].state = TUNNELDIE;
1965
1966 // free control messages
1967 while ((c = tunnel[t].controls))
1968 {
1969 controlt * n = c->next;
1970 tunnel[t].controls = n;
1971 tunnel[t].controlc--;
1972 c->next = controlfree;
1973 controlfree = c;
1974 }
1975 // kill sessions
1976 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1977 if (session[s].tunnel == t)
1978 sessionkill(s, reason);
1979
1980 // free tunnel
1981 tunnelclear(t);
1982 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
1983 cli_tunnel_actions[t].action = 0;
1984 cluster_send_tunnel(t);
1985 }
1986
1987 // shut down a tunnel cleanly
1988 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
1989 {
1990 sessionidt s;
1991
1992 CSTAT(tunnelshutdown);
1993
1994 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
1995 {
1996 // never set up, can immediately kill
1997 tunnelkill(t, reason);
1998 return;
1999 }
2000 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2001
2002 // close session
2003 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2004 if (session[s].tunnel == t)
2005 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2006
2007 tunnel[t].state = TUNNELDIE;
2008 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2009 cluster_send_tunnel(t);
2010 // TBA - should we wait for sessions to stop?
2011 if (result)
2012 {
2013 controlt *c = controlnew(4); // sending StopCCN
2014 if (error)
2015 {
2016 uint8_t buf[64];
2017 int l = 4;
2018 *(uint16_t *) buf = htons(result);
2019 *(uint16_t *) (buf+2) = htons(error);
2020 if (msg)
2021 {
2022 int m = strlen(msg);
2023 if (m + 4 > sizeof(buf))
2024 m = sizeof(buf) - 4;
2025
2026 memcpy(buf+4, msg, m);
2027 l += m;
2028 }
2029
2030 controlb(c, 1, buf, l, 1);
2031 }
2032 else
2033 control16(c, 1, result, 1);
2034
2035 control16(c, 9, t, 1); // assigned tunnel (our end)
2036 controladd(c, 0, t); // send the message
2037 }
2038 }
2039
2040 // read and process packet on tunnel (UDP)
2041 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2042 {
2043 uint8_t *chapresponse = NULL;
2044 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2045 uint8_t *p = buf + 2;
2046
2047
2048 CSTAT(processudp);
2049
2050 udp_rx += len;
2051 udp_rx_pkt++;
2052 LOG_HEX(5, "UDP Data", buf, len);
2053 STAT(tunnel_rx_packets);
2054 INC_STAT(tunnel_rx_bytes, len);
2055 if (len < 6)
2056 {
2057 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2058 STAT(tunnel_rx_errors);
2059 return;
2060 }
2061 if ((buf[1] & 0x0F) != 2)
2062 {
2063 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2064 STAT(tunnel_rx_errors);
2065 return;
2066 }
2067 if (*buf & 0x40)
2068 { // length
2069 l = ntohs(*(uint16_t *) p);
2070 p += 2;
2071 }
2072 t = ntohs(*(uint16_t *) p);
2073 p += 2;
2074 s = ntohs(*(uint16_t *) p);
2075 p += 2;
2076 if (s >= MAXSESSION)
2077 {
2078 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2079 STAT(tunnel_rx_errors);
2080 return;
2081 }
2082 if (t >= MAXTUNNEL)
2083 {
2084 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2085 STAT(tunnel_rx_errors);
2086 return;
2087 }
2088 if (*buf & 0x08)
2089 { // ns/nr
2090 ns = ntohs(*(uint16_t *) p);
2091 p += 2;
2092 nr = ntohs(*(uint16_t *) p);
2093 p += 2;
2094 }
2095 if (*buf & 0x02)
2096 { // offset
2097 uint16_t o = ntohs(*(uint16_t *) p);
2098 p += o + 2;
2099 }
2100 if ((p - buf) > l)
2101 {
2102 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2103 STAT(tunnel_rx_errors);
2104 return;
2105 }
2106 l -= (p - buf);
2107
2108 // used to time out old tunnels
2109 if (t && tunnel[t].state == TUNNELOPEN)
2110 tunnel[t].lastrec = time_now;
2111
2112 if (*buf & 0x80)
2113 { // control
2114 uint16_t message = 0xFFFF; // message type
2115 uint8_t fatal = 0;
2116 uint8_t mandatory = 0;
2117 uint16_t asession = 0; // assigned session
2118 uint32_t amagic = 0; // magic number
2119 uint8_t aflags = 0; // flags from last LCF
2120 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2121 char called[MAXTEL] = ""; // called number
2122 char calling[MAXTEL] = ""; // calling number
2123
2124 if (!config->cluster_iam_master)
2125 {
2126 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2127 return;
2128 }
2129
2130 // control messages must have bits 0x80|0x40|0x08
2131 // (type, length and sequence) set, and bits 0x02|0x01
2132 // (offset and priority) clear
2133 if ((*buf & 0xCB) != 0xC8)
2134 {
2135 LOG(1, s, t, "Bad control header %02X\n", *buf);
2136 STAT(tunnel_rx_errors);
2137 return;
2138 }
2139
2140 // check for duplicate tunnel open message
2141 if (!t && ns == 0)
2142 {
2143 int i;
2144
2145 //
2146 // Is this a duplicate of the first packet? (SCCRQ)
2147 //
2148 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2149 {
2150 if (tunnel[i].state != TUNNELOPENING ||
2151 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2152 tunnel[i].port != ntohs(addr->sin_port) )
2153 continue;
2154 t = i;
2155 LOG(3, s, t, "Duplicate SCCRQ?\n");
2156 break;
2157 }
2158 }
2159
2160 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2161 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2162
2163 // if no tunnel specified, assign one
2164 if (!t)
2165 {
2166 if (!(t = new_tunnel()))
2167 {
2168 LOG(1, 0, 0, "No more tunnels\n");
2169 STAT(tunnel_overflow);
2170 return;
2171 }
2172 tunnelclear(t);
2173 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2174 tunnel[t].port = ntohs(addr->sin_port);
2175 tunnel[t].window = 4; // default window
2176 STAT(tunnel_created);
2177 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2178 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2179 }
2180
2181 // If the 'ns' just received is not the 'nr' we're
2182 // expecting, just send an ack and drop it.
2183 //
2184 // if 'ns' is less, then we got a retransmitted packet.
2185 // if 'ns' is greater than missed a packet. Either way
2186 // we should ignore it.
2187 if (ns != tunnel[t].nr)
2188 {
2189 // is this the sequence we were expecting?
2190 STAT(tunnel_rx_errors);
2191 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2192 t, ns, tunnel[t].nr);
2193
2194 if (l) // Is this not a ZLB?
2195 controlnull(t);
2196 return;
2197 }
2198
2199 // check sequence of this message
2200 {
2201 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2202 // some to clear maybe?
2203 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2204 {
2205 controlt *c = tunnel[t].controls;
2206 tunnel[t].controls = c->next;
2207 tunnel[t].controlc--;
2208 c->next = controlfree;
2209 controlfree = c;
2210 skip--;
2211 tunnel[t].try = 0; // we have progress
2212 }
2213
2214 // receiver advance (do here so quoted correctly in any sends below)
2215 if (l) tunnel[t].nr = (ns + 1);
2216 if (skip < 0) skip = 0;
2217 if (skip < tunnel[t].controlc)
2218 {
2219 // some control packets can now be sent that were previous stuck out of window
2220 int tosend = tunnel[t].window - skip;
2221 controlt *c = tunnel[t].controls;
2222 while (c && skip)
2223 {
2224 c = c->next;
2225 skip--;
2226 }
2227 while (c && tosend)
2228 {
2229 tunnel[t].try = 0; // first send
2230 tunnelsend(c->buf, c->length, t);
2231 c = c->next;
2232 tosend--;
2233 }
2234 }
2235 if (!tunnel[t].controlc)
2236 tunnel[t].retry = 0; // caught up
2237 }
2238 if (l)
2239 { // if not a null message
2240 int result = 0;
2241 int error = 0;
2242 char *msg = 0;
2243
2244 // Default disconnect cause/message on receipt of CDN. Set to
2245 // more specific value from attribute 1 (result code) or 46
2246 // (disconnect cause) if present below.
2247 int disc_cause_set = 0;
2248 int disc_cause = TERM_NAS_REQUEST;
2249 char const *disc_reason = "Closed (Received CDN).";
2250
2251 // process AVPs
2252 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2253 {
2254 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2255 uint8_t *b = p;
2256 uint8_t flags = *p;
2257 uint16_t mtype;
2258
2259 if (n > l)
2260 {
2261 LOG(1, s, t, "Invalid length in AVP\n");
2262 STAT(tunnel_rx_errors);
2263 return;
2264 }
2265 p += n; // next
2266 l -= n;
2267 if (flags & 0x3C) // reserved bits, should be clear
2268 {
2269 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2270 fatal = flags;
2271 result = 2; // general error
2272 error = 3; // reserved field non-zero
2273 msg = 0;
2274 continue; // next
2275 }
2276 b += 2;
2277 if (*(uint16_t *) (b))
2278 {
2279 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2280 fatal = flags;
2281 result = 2; // general error
2282 error = 6; // generic vendor-specific error
2283 msg = "unsupported vendor-specific";
2284 continue; // next
2285 }
2286 b += 2;
2287 mtype = ntohs(*(uint16_t *) (b));
2288 b += 2;
2289 n -= 6;
2290
2291 if (flags & 0x40)
2292 {
2293 uint16_t orig_len;
2294
2295 // handle hidden AVPs
2296 if (!*config->l2tp_secret)
2297 {
2298 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2299 fatal = flags;
2300 result = 2; // general error
2301 error = 6; // generic vendor-specific error
2302 msg = "secret not specified";
2303 continue;
2304 }
2305 if (!session[s].random_vector_length)
2306 {
2307 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2308 fatal = flags;
2309 result = 2; // general error
2310 error = 6; // generic
2311 msg = "no random vector";
2312 continue;
2313 }
2314 if (n < 8)
2315 {
2316 LOG(2, s, t, "Short hidden AVP.\n");
2317 fatal = flags;
2318 result = 2; // general error
2319 error = 2; // length is wrong
2320 msg = 0;
2321 continue;
2322 }
2323
2324 // Unhide the AVP
2325 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2326
2327 orig_len = ntohs(*(uint16_t *) b);
2328 if (orig_len > n + 2)
2329 {
2330 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2331 orig_len, n);
2332
2333 fatal = flags;
2334 result = 2; // general error
2335 error = 2; // length is wrong
2336 msg = 0;
2337 continue;
2338 }
2339
2340 b += 2;
2341 n = orig_len;
2342 }
2343
2344 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2345 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2346
2347 switch (mtype)
2348 {
2349 case 0: // message type
2350 message = ntohs(*(uint16_t *) b);
2351 mandatory = flags & 0x80;
2352 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2353 break;
2354 case 1: // result code
2355 {
2356 uint16_t rescode = ntohs(*(uint16_t *) b);
2357 char const *resdesc = "(unknown)";
2358 char const *errdesc = NULL;
2359 int cause = 0;
2360
2361 if (message == 4)
2362 { /* StopCCN */
2363 resdesc = l2tp_stopccn_result_code(rescode);
2364 cause = TERM_LOST_SERVICE;
2365 }
2366 else if (message == 14)
2367 { /* CDN */
2368 resdesc = l2tp_cdn_result_code(rescode);
2369 if (rescode == 1)
2370 cause = TERM_LOST_CARRIER;
2371 else
2372 cause = TERM_ADMIN_RESET;
2373 }
2374
2375 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2376 if (n >= 4)
2377 {
2378 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2379 errdesc = l2tp_error_code(errcode);
2380 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2381 }
2382 if (n > 4)
2383 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2384
2385 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2386 {
2387 disc_cause_set = mtype;
2388 disc_reason = errdesc ? errdesc : resdesc;
2389 disc_cause = cause;
2390 }
2391
2392 break;
2393 }
2394 break;
2395 case 2: // protocol version
2396 {
2397 version = ntohs(*(uint16_t *) (b));
2398 LOG(4, s, t, " Protocol version = %u\n", version);
2399 if (version && version != 0x0100)
2400 { // allow 0.0 and 1.0
2401 LOG(1, s, t, " Bad protocol version %04X\n", version);
2402 fatal = flags;
2403 result = 5; // unspported protocol version
2404 error = 0x0100; // supported version
2405 msg = 0;
2406 continue; // next
2407 }
2408 }
2409 break;
2410 case 3: // framing capabilities
2411 break;
2412 case 4: // bearer capabilities
2413 break;
2414 case 5: // tie breaker
2415 // We never open tunnels, so we don't care about tie breakers
2416 continue;
2417 case 6: // firmware revision
2418 break;
2419 case 7: // host name
2420 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2421 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2422 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2423 // TBA - to send to RADIUS
2424 break;
2425 case 8: // vendor name
2426 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2427 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2428 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2429 break;
2430 case 9: // assigned tunnel
2431 tunnel[t].far = ntohs(*(uint16_t *) (b));
2432 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2433 break;
2434 case 10: // rx window
2435 tunnel[t].window = ntohs(*(uint16_t *) (b));
2436 if (!tunnel[t].window)
2437 tunnel[t].window = 1; // window of 0 is silly
2438 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2439 break;
2440 case 11: // Challenge
2441 {
2442 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2443 build_chap_response(b, 2, n, &chapresponse);
2444 }
2445 break;
2446 case 13: // Response
2447 // Why did they send a response? We never challenge.
2448 LOG(2, s, t, " received unexpected challenge response\n");
2449 break;
2450
2451 case 14: // assigned session
2452 asession = session[s].far = ntohs(*(uint16_t *) (b));
2453 LOG(4, s, t, " assigned session = %u\n", asession);
2454 break;
2455 case 15: // call serial number
2456 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2457 break;
2458 case 18: // bearer type
2459 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2460 // TBA - for RADIUS
2461 break;
2462 case 19: // framing type
2463 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2464 // TBA
2465 break;
2466 case 21: // called number
2467 memset(called, 0, sizeof(called));
2468 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2469 LOG(4, s, t, " Called <%s>\n", called);
2470 break;
2471 case 22: // calling number
2472 memset(calling, 0, sizeof(calling));
2473 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2474 LOG(4, s, t, " Calling <%s>\n", calling);
2475 break;
2476 case 23: // subtype
2477 break;
2478 case 24: // tx connect speed
2479 if (n == 4)
2480 {
2481 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2482 }
2483 else
2484 {
2485 // AS5300s send connect speed as a string
2486 char tmp[30];
2487 memset(tmp, 0, sizeof(tmp));
2488 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2489 session[s].tx_connect_speed = atol(tmp);
2490 }
2491 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2492 break;
2493 case 38: // rx connect speed
2494 if (n == 4)
2495 {
2496 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2497 }
2498 else
2499 {
2500 // AS5300s send connect speed as a string
2501 char tmp[30];
2502 memset(tmp, 0, sizeof(tmp));
2503 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2504 session[s].rx_connect_speed = atol(tmp);
2505 }
2506 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2507 break;
2508 case 25: // Physical Channel ID
2509 {
2510 uint32_t tmp = ntohl(*(uint32_t *) b);
2511 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2512 break;
2513 }
2514 case 29: // Proxy Authentication Type
2515 {
2516 uint16_t atype = ntohs(*(uint16_t *)b);
2517 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2518 break;
2519 }
2520 case 30: // Proxy Authentication Name
2521 {
2522 char authname[64];
2523 memset(authname, 0, sizeof(authname));
2524 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2525 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2526 authname);
2527 break;
2528 }
2529 case 31: // Proxy Authentication Challenge
2530 {
2531 LOG(4, s, t, " Proxy Auth Challenge\n");
2532 break;
2533 }
2534 case 32: // Proxy Authentication ID
2535 {
2536 uint16_t authid = ntohs(*(uint16_t *)(b));
2537 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2538 break;
2539 }
2540 case 33: // Proxy Authentication Response
2541 LOG(4, s, t, " Proxy Auth Response\n");
2542 break;
2543 case 27: // last sent lcp
2544 { // find magic number
2545 uint8_t *p = b, *e = p + n;
2546 while (p + 1 < e && p[1] && p + p[1] <= e)
2547 {
2548 if (*p == 5 && p[1] == 6) // Magic-Number
2549 amagic = ntohl(*(uint32_t *) (p + 2));
2550 else if (*p == 7) // Protocol-Field-Compression
2551 aflags |= SESSION_PFC;
2552 else if (*p == 8) // Address-and-Control-Field-Compression
2553 aflags |= SESSION_ACFC;
2554 p += p[1];
2555 }
2556 }
2557 break;
2558 case 28: // last recv lcp confreq
2559 break;
2560 case 26: // Initial Received LCP CONFREQ
2561 break;
2562 case 39: // seq required - we control it as an LNS anyway...
2563 break;
2564 case 36: // Random Vector
2565 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2566 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2567 if (n > sizeof(session[s].random_vector))
2568 n = sizeof(session[s].random_vector);
2569 memcpy(session[s].random_vector, b, n);
2570 session[s].random_vector_length = n;
2571 break;
2572 case 46: // ppp disconnect cause
2573 if (n >= 5)
2574 {
2575 uint16_t code = ntohs(*(uint16_t *) b);
2576 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2577 uint8_t dir = *(b + 4);
2578
2579 LOG(4, s, t, " PPP disconnect cause "
2580 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2581 code, proto, dir, n - 5, b + 5);
2582
2583 disc_cause_set = mtype;
2584
2585 switch (code)
2586 {
2587 case 1: // admin disconnect
2588 disc_cause = TERM_ADMIN_RESET;
2589 disc_reason = "Administrative disconnect";
2590 break;
2591 case 3: // lcp terminate
2592 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2593 disc_cause = TERM_USER_REQUEST;
2594 disc_reason = "Normal disconnection";
2595 break;
2596 case 4: // compulsory encryption unavailable
2597 if (dir != 1) break; // 1=refused by peer, 2=local
2598 disc_cause = TERM_USER_ERROR;
2599 disc_reason = "Compulsory encryption refused";
2600 break;
2601 case 5: // lcp: fsm timeout
2602 disc_cause = TERM_PORT_ERROR;
2603 disc_reason = "LCP: FSM timeout";
2604 break;
2605 case 6: // lcp: no recognisable lcp packets received
2606 disc_cause = TERM_PORT_ERROR;
2607 disc_reason = "LCP: no recognisable LCP packets";
2608 break;
2609 case 7: // lcp: magic-no error (possibly looped back)
2610 disc_cause = TERM_PORT_ERROR;
2611 disc_reason = "LCP: magic-no error (possible loop)";
2612 break;
2613 case 8: // lcp: echo request timeout
2614 disc_cause = TERM_PORT_ERROR;
2615 disc_reason = "LCP: echo request timeout";
2616 break;
2617 case 13: // auth: fsm timeout
2618 disc_cause = TERM_SERVICE_UNAVAILABLE;
2619 disc_reason = "Authentication: FSM timeout";
2620 break;
2621 case 15: // auth: unacceptable auth protocol
2622 disc_cause = TERM_SERVICE_UNAVAILABLE;
2623 disc_reason = "Unacceptable authentication protocol";
2624 break;
2625 case 16: // auth: authentication failed
2626 disc_cause = TERM_SERVICE_UNAVAILABLE;
2627 disc_reason = "Authentication failed";
2628 break;
2629 case 17: // ncp: fsm timeout
2630 disc_cause = TERM_SERVICE_UNAVAILABLE;
2631 disc_reason = "NCP: FSM timeout";
2632 break;
2633 case 18: // ncp: no ncps available
2634 disc_cause = TERM_SERVICE_UNAVAILABLE;
2635 disc_reason = "NCP: no NCPs available";
2636 break;
2637 case 19: // ncp: failure to converge on acceptable address
2638 disc_cause = TERM_SERVICE_UNAVAILABLE;
2639 disc_reason = (dir == 1)
2640 ? "NCP: too many Configure-Naks received from peer"
2641 : "NCP: too many Configure-Naks sent to peer";
2642 break;
2643 case 20: // ncp: user not permitted to use any address
2644 disc_cause = TERM_SERVICE_UNAVAILABLE;
2645 disc_reason = (dir == 1)
2646 ? "NCP: local link address not acceptable to peer"
2647 : "NCP: remote link address not acceptable";
2648 break;
2649 }
2650 }
2651 break;
2652 default:
2653 {
2654 static char e[] = "unknown AVP 0xXXXX";
2655 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2656 fatal = flags;
2657 result = 2; // general error
2658 error = 8; // unknown mandatory AVP
2659 sprintf((msg = e) + 14, "%04x", mtype);
2660 continue; // next
2661 }
2662 }
2663 }
2664 // process message
2665 if (fatal & 0x80)
2666 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2667 else
2668 switch (message)
2669 {
2670 case 1: // SCCRQ - Start Control Connection Request
2671 tunnel[t].state = TUNNELOPENING;
2672 if (main_quit != QUIT_SHUTDOWN)
2673 {
2674 controlt *c = controlnew(2); // sending SCCRP
2675 control16(c, 2, version, 1); // protocol version
2676 control32(c, 3, 3, 1); // framing
2677 controls(c, 7, hostname, 1); // host name
2678 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2679 control16(c, 9, t, 1); // assigned tunnel
2680 controladd(c, 0, t); // send the resply
2681 }
2682 else
2683 {
2684 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2685 }
2686 break;
2687 case 2: // SCCRP
2688 tunnel[t].state = TUNNELOPEN;
2689 tunnel[t].lastrec = time_now;
2690 break;
2691 case 3: // SCCN
2692 tunnel[t].state = TUNNELOPEN;
2693 tunnel[t].lastrec = time_now;
2694 controlnull(t); // ack
2695 break;
2696 case 4: // StopCCN
2697 controlnull(t); // ack
2698 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2699 break;
2700 case 6: // HELLO
2701 controlnull(t); // simply ACK
2702 break;
2703 case 7: // OCRQ
2704 // TBA
2705 break;
2706 case 8: // OCRO
2707 // TBA
2708 break;
2709 case 9: // OCCN
2710 // TBA
2711 break;
2712 case 10: // ICRQ
2713 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2714 {
2715 controlt *c = controlnew(11); // ICRP
2716
2717 s = sessionfree;
2718 sessionfree = session[s].next;
2719 memset(&session[s], 0, sizeof(session[s]));
2720
2721 if (s > config->cluster_highest_sessionid)
2722 config->cluster_highest_sessionid = s;
2723
2724 session[s].opened = time_now;
2725 session[s].tunnel = t;
2726 session[s].far = asession;
2727 session[s].last_packet = session[s].last_data = time_now;
2728 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2729 control16(c, 14, s, 1); // assigned session
2730 controladd(c, asession, t); // send the reply
2731
2732 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2733 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2734
2735 session[s].ppp.phase = Establish;
2736 session[s].ppp.lcp = Starting;
2737
2738 STAT(session_created);
2739 break;
2740 }
2741
2742 {
2743 controlt *c = controlnew(14); // CDN
2744 if (!sessionfree)
2745 {
2746 STAT(session_overflow);
2747 LOG(1, 0, t, "No free sessions\n");
2748 control16(c, 1, 4, 0); // temporary lack of resources
2749 }
2750 else
2751 control16(c, 1, 2, 7); // shutting down, try another
2752
2753 controladd(c, asession, t); // send the message
2754 }
2755 return;
2756 case 11: // ICRP
2757 // TBA
2758 break;
2759 case 12: // ICCN
2760 if (amagic == 0) amagic = time_now;
2761 session[s].magic = amagic; // set magic number
2762 session[s].flags = aflags; // set flags received
2763 session[s].mru = PPPoE_MRU; // default
2764 controlnull(t); // ack
2765
2766 // start LCP
2767 sess_local[s].lcp_authtype = config->radius_authprefer;
2768 sess_local[s].ppp_mru = MRU;
2769
2770 // Set multilink options before sending initial LCP packet
2771 sess_local[s].mp_mrru = 1614;
2772 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2773
2774 sendlcp(s, t);
2775 change_state(s, lcp, RequestSent);
2776 break;
2777
2778 case 14: // CDN
2779 controlnull(t); // ack
2780 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2781 break;
2782 case 0xFFFF:
2783 LOG(1, s, t, "Missing message type\n");
2784 break;
2785 default:
2786 STAT(tunnel_rx_errors);
2787 if (mandatory)
2788 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2789 else
2790 LOG(1, s, t, "Unknown message type %u\n", message);
2791 break;
2792 }
2793 if (chapresponse) free(chapresponse);
2794 cluster_send_tunnel(t);
2795 }
2796 else
2797 {
2798 LOG(4, s, t, " Got a ZLB ack\n");
2799 }
2800 }
2801 else
2802 { // data
2803 uint16_t proto;
2804
2805 LOG_HEX(5, "Receive Tunnel Data", p, l);
2806 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2807 { // HDLC address header, discard
2808 p += 2;
2809 l -= 2;
2810 }
2811 if (l < 2)
2812 {
2813 LOG(1, s, t, "Short ppp length %d\n", l);
2814 STAT(tunnel_rx_errors);
2815 return;
2816 }
2817 if (*p & 1)
2818 {
2819 proto = *p++;
2820 l--;
2821 }
2822 else
2823 {
2824 proto = ntohs(*(uint16_t *) p);
2825 p += 2;
2826 l -= 2;
2827 }
2828
2829 if (s && !session[s].opened) // Is something wrong??
2830 {
2831 if (!config->cluster_iam_master)
2832 {
2833 // Pass it off to the master to deal with..
2834 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2835 return;
2836 }
2837
2838
2839 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
2840 STAT(tunnel_rx_errors);
2841 return;
2842 }
2843
2844 if (proto == PPPPAP)
2845 {
2846 session[s].last_packet = time_now;
2847 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2848 processpap(s, t, p, l);
2849 }
2850 else if (proto == PPPCHAP)
2851 {
2852 session[s].last_packet = time_now;
2853 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2854 processchap(s, t, p, l);
2855 }
2856 else if (proto == PPPLCP)
2857 {
2858 session[s].last_packet = time_now;
2859 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2860 processlcp(s, t, p, l);
2861 }
2862 else if (proto == PPPIPCP)
2863 {
2864 session[s].last_packet = time_now;
2865 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2866 processipcp(s, t, p, l);
2867 }
2868 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
2869 {
2870 session[s].last_packet = time_now;
2871 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2872 processipv6cp(s, t, p, l);
2873 }
2874 else if (proto == PPPCCP)
2875 {
2876 session[s].last_packet = time_now;
2877 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2878 processccp(s, t, p, l);
2879 }
2880 else if (proto == PPPIP)
2881 {
2882 if (session[s].die)
2883 {
2884 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
2885 return; // closing session, PPP not processed
2886 }
2887
2888 session[s].last_packet = session[s].last_data = time_now;
2889 if (session[s].walled_garden && !config->cluster_iam_master)
2890 {
2891 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2892 return;
2893 }
2894
2895 processipin(s, t, p, l);
2896 }
2897 else if (proto == PPPMP)
2898 {
2899 if (session[s].die)
2900 {
2901 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
2902 return; // closing session, PPP not processed
2903 }
2904
2905 session[s].last_packet = session[s].last_data = time_now;
2906 if (session[s].walled_garden && !config->cluster_iam_master)
2907 {
2908 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2909 return;
2910 }
2911
2912 processmpin(s, t, p, l);
2913 }
2914 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
2915 {
2916 if (session[s].die)
2917 {
2918 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
2919 return; // closing session, PPP not processed
2920 }
2921
2922 session[s].last_packet = session[s].last_data = time_now;
2923 if (session[s].walled_garden && !config->cluster_iam_master)
2924 {
2925 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2926 return;
2927 }
2928
2929 processipv6in(s, t, p, l);
2930 }
2931 else if (session[s].ppp.lcp == Opened)
2932 {
2933 session[s].last_packet = time_now;
2934 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2935 protoreject(s, t, p, l, proto);
2936 }
2937 else
2938 {
2939 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
2940 proto, ppp_state(session[s].ppp.lcp));
2941 }
2942 }
2943 }
2944
2945 // read and process packet on tun
2946 static void processtun(uint8_t * buf, int len)
2947 {
2948 LOG_HEX(5, "Receive TUN Data", buf, len);
2949 STAT(tun_rx_packets);
2950 INC_STAT(tun_rx_bytes, len);
2951
2952 CSTAT(processtun);
2953
2954 eth_rx_pkt++;
2955 eth_rx += len;
2956 if (len < 22)
2957 {
2958 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
2959 STAT(tun_rx_errors);
2960 return;
2961 }
2962
2963 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
2964 processipout(buf, len);
2965 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
2966 && config->ipv6_prefix.s6_addr[0])
2967 processipv6out(buf, len);
2968
2969 // Else discard.
2970 }
2971
2972 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2973 // that we look at the whole of the tunnel, radius and session tables
2974 // every second
2975 static void regular_cleanups(double period)
2976 {
2977 // Next tunnel, radius and session to check for actions on.
2978 static tunnelidt t = 0;
2979 static int r = 0;
2980 static sessionidt s = 0;
2981
2982 int t_actions = 0;
2983 int r_actions = 0;
2984 int s_actions = 0;
2985
2986 int t_slice;
2987 int r_slice;
2988 int s_slice;
2989
2990 int i;
2991 int a;
2992
2993 // divide up tables into slices based on the last run
2994 t_slice = config->cluster_highest_tunnelid * period;
2995 r_slice = (MAXRADIUS - 1) * period;
2996 s_slice = config->cluster_highest_sessionid * period;
2997
2998 if (t_slice < 1)
2999 t_slice = 1;
3000 else if (t_slice > config->cluster_highest_tunnelid)
3001 t_slice = config->cluster_highest_tunnelid;
3002
3003 if (r_slice < 1)
3004 r_slice = 1;
3005 else if (r_slice > (MAXRADIUS - 1))
3006 r_slice = MAXRADIUS - 1;
3007
3008 if (s_slice < 1)
3009 s_slice = 1;
3010 else if (s_slice > config->cluster_highest_sessionid)
3011 s_slice = config->cluster_highest_sessionid;
3012
3013 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3014
3015 for (i = 0; i < t_slice; i++)
3016 {
3017 t++;
3018 if (t > config->cluster_highest_tunnelid)
3019 t = 1;
3020
3021 // check for expired tunnels
3022 if (tunnel[t].die && tunnel[t].die <= TIME)
3023 {
3024 STAT(tunnel_timeout);
3025 tunnelkill(t, "Expired");
3026 t_actions++;
3027 continue;
3028 }
3029 // check for message resend
3030 if (tunnel[t].retry && tunnel[t].controlc)
3031 {
3032 // resend pending messages as timeout on reply
3033 if (tunnel[t].retry <= TIME)
3034 {
3035 controlt *c = tunnel[t].controls;
3036 uint16_t w = tunnel[t].window;
3037 tunnel[t].try++; // another try
3038 if (tunnel[t].try > 5)
3039 tunnelkill(t, "Timeout on control message"); // game over
3040 else
3041 while (c && w--)
3042 {
3043 tunnelsend(c->buf, c->length, t);
3044 c = c->next;
3045 }
3046
3047 t_actions++;
3048 }
3049 }
3050 // Send hello
3051 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3052 {
3053 controlt *c = controlnew(6); // sending HELLO
3054 controladd(c, 0, t); // send the message
3055 LOG(3, 0, t, "Sending HELLO message\n");
3056 t_actions++;
3057 }
3058
3059 // Check for tunnel changes requested from the CLI
3060 if ((a = cli_tunnel_actions[t].action))
3061 {
3062 cli_tunnel_actions[t].action = 0;
3063 if (a & CLI_TUN_KILL)
3064 {
3065 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3066 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3067 t_actions++;
3068 }
3069 }
3070 }
3071
3072 for (i = 0; i < r_slice; i++)
3073 {
3074 r++;
3075 if (r >= MAXRADIUS)
3076 r = 1;
3077
3078 if (!radius[r].state)
3079 continue;
3080
3081 if (radius[r].retry <= TIME)
3082 {
3083 radiusretry(r);
3084 r_actions++;
3085 }
3086 }
3087
3088 for (i = 0; i < s_slice; i++)
3089 {
3090 s++;
3091 if (s > config->cluster_highest_sessionid)
3092 s = 1;
3093
3094 if (!session[s].opened) // Session isn't in use
3095 continue;
3096
3097 // check for expired sessions
3098 if (session[s].die)
3099 {
3100 if (session[s].die <= TIME)
3101 {
3102 sessionkill(s, "Expired");
3103 s_actions++;
3104 }
3105 continue;
3106 }
3107
3108 // PPP timeouts
3109 if (sess_local[s].lcp.restart <= time_now)
3110 {
3111 int next_state = session[s].ppp.lcp;
3112 switch (session[s].ppp.lcp)
3113 {
3114 case RequestSent:
3115 case AckReceived:
3116 next_state = RequestSent;
3117
3118 case AckSent:
3119 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3120 {
3121 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3122 sendlcp(s, session[s].tunnel);
3123 change_state(s, lcp, next_state);
3124 }
3125 else
3126 {
3127 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3128 STAT(session_timeout);
3129 }
3130
3131 s_actions++;
3132 }
3133
3134 if (session[s].die)
3135 continue;
3136 }
3137
3138 if (sess_local[s].ipcp.restart <= time_now)
3139 {
3140 int next_state = session[s].ppp.ipcp;
3141 switch (session[s].ppp.ipcp)
3142 {
3143 case RequestSent:
3144 case AckReceived:
3145 next_state = RequestSent;
3146
3147 case AckSent:
3148 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3149 {
3150 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3151 sendipcp(s, session[s].tunnel);
3152 change_state(s, ipcp, next_state);
3153 }
3154 else
3155 {
3156 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3157 STAT(session_timeout);
3158 }
3159
3160 s_actions++;
3161 }
3162
3163 if (session[s].die)
3164 continue;
3165 }
3166
3167 if (sess_local[s].ipv6cp.restart <= time_now)
3168 {
3169 int next_state = session[s].ppp.ipv6cp;
3170 switch (session[s].ppp.ipv6cp)
3171 {
3172 case RequestSent:
3173 case AckReceived:
3174 next_state = RequestSent;
3175
3176 case AckSent:
3177 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3178 {
3179 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3180 sendipv6cp(s, session[s].tunnel);
3181 change_state(s, ipv6cp, next_state);
3182 }
3183 else
3184 {
3185 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3186 change_state(s, ipv6cp, Stopped);
3187 }
3188
3189 s_actions++;
3190 }
3191 }
3192
3193 if (sess_local[s].ccp.restart <= time_now)
3194 {
3195 int next_state = session[s].ppp.ccp;
3196 switch (session[s].ppp.ccp)
3197 {
3198 case RequestSent:
3199 case AckReceived:
3200 next_state = RequestSent;
3201
3202 case AckSent:
3203 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3204 {
3205 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3206 sendccp(s, session[s].tunnel);
3207 change_state(s, ccp, next_state);
3208 }
3209 else
3210 {
3211 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3212 change_state(s, ccp, Stopped);
3213 }
3214
3215 s_actions++;
3216 }
3217 }
3218
3219 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3220 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3221 {
3222 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3223 STAT(session_timeout);
3224 s_actions++;
3225 continue;
3226 }
3227
3228 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3229 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3230 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3231 {
3232 uint8_t b[MAXETHER];
3233
3234 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3235 if (!q) continue;
3236
3237 *q = EchoReq;
3238 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3239 *(uint16_t *)(q + 2) = htons(8); // Length
3240 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3241
3242 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3243 (int)(time_now - session[s].last_packet));
3244 tunnelsend(b, 24, session[s].tunnel); // send it
3245 sess_local[s].last_echo = time_now;
3246 s_actions++;
3247 }
3248
3249 // Drop sessions who have reached session_timeout seconds
3250 if (session[s].session_timeout)
3251 {
3252 bundleidt bid = session[s].bundle;
3253 if (bid)
3254 {
3255 if (time_now - bundle[bid].last_check >= 1)
3256 {
3257 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3258 bundle[bid].last_check = time_now;
3259 if (bundle[bid].online_time >= session[s].session_timeout)
3260 {
3261 int ses;
3262 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3263 {
3264 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3265 s_actions++;
3266 continue;
3267 }
3268 }
3269 }
3270 }
3271 else if (time_now - session[s].opened >= session[s].session_timeout)
3272 {
3273 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3274 s_actions++;
3275 continue;
3276 }
3277 }
3278
3279 // Drop sessions who have reached idle_timeout seconds
3280 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3281 {
3282 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3283 STAT(session_timeout);
3284 s_actions++;
3285 continue;
3286 }
3287
3288 // Check for actions requested from the CLI
3289 if ((a = cli_session_actions[s].action))
3290 {
3291 int send = 0;
3292
3293 cli_session_actions[s].action = 0;
3294 if (a & CLI_SESS_KILL)
3295 {
3296 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3297 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3298 a = 0; // dead, no need to check for other actions
3299 s_actions++;
3300 }
3301
3302 if (a & CLI_SESS_NOSNOOP)
3303 {
3304 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3305 session[s].snoop_ip = 0;
3306 session[s].snoop_port = 0;
3307 s_actions++;
3308 send++;
3309 }
3310 else if (a & CLI_SESS_SNOOP)
3311 {
3312 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3313 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3314 cli_session_actions[s].snoop_port);
3315
3316 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3317 session[s].snoop_port = cli_session_actions[s].snoop_port;
3318 s_actions++;
3319 send++;
3320 }
3321
3322 if (a & CLI_SESS_NOTHROTTLE)
3323 {
3324 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3325 throttle_session(s, 0, 0);
3326 s_actions++;
3327 send++;
3328 }
3329 else if (a & CLI_SESS_THROTTLE)
3330 {
3331 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3332 cli_session_actions[s].throttle_in,
3333 cli_session_actions[s].throttle_out);
3334
3335 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3336 s_actions++;
3337 send++;
3338 }
3339
3340 if (a & CLI_SESS_NOFILTER)
3341 {
3342 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3343 filter_session(s, 0, 0);
3344 s_actions++;
3345 send++;
3346 }
3347 else if (a & CLI_SESS_FILTER)
3348 {
3349 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3350 cli_session_actions[s].filter_in,
3351 cli_session_actions[s].filter_out);
3352
3353 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3354 s_actions++;
3355 send++;
3356 }
3357
3358 if (send)
3359 cluster_send_session(s);
3360 }
3361
3362 // RADIUS interim accounting
3363 if (config->radius_accounting && config->radius_interim > 0
3364 && session[s].ip && !session[s].walled_garden
3365 && !sess_local[s].radius // RADIUS already in progress
3366 && time_now - sess_local[s].last_interim >= config->radius_interim
3367 && session[s].flags & SESSION_STARTED)
3368 {
3369 int rad = radiusnew(s);
3370 if (!rad)
3371 {
3372 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3373 STAT(radius_overflow);
3374 continue;
3375 }
3376
3377 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3378 session[s].user, session[s].unique_id);
3379
3380 radiussend(rad, RADIUSINTERIM);
3381 sess_local[s].last_interim = time_now;
3382 s_actions++;
3383 }
3384 }
3385
3386 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3387 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3388 }
3389
3390 //
3391 // Are we in the middle of a tunnel update, or radius
3392 // requests??
3393 //
3394 static int still_busy(void)
3395 {
3396 int i;
3397 static clockt last_talked = 0;
3398 static clockt start_busy_wait = 0;
3399
3400 if (!config->cluster_iam_master)
3401 {
3402 #ifdef BGP
3403 static time_t stopped_bgp = 0;
3404 if (bgp_configured)
3405 {
3406 if (!stopped_bgp)
3407 {
3408 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3409
3410 for (i = 0; i < BGP_NUM_PEERS; i++)
3411 if (bgp_peers[i].state == Established)
3412 bgp_stop(&bgp_peers[i]);
3413
3414 stopped_bgp = time_now;
3415
3416 // we don't want to become master
3417 cluster_send_ping(0);
3418
3419 return 1;
3420 }
3421
3422 if (time_now < (stopped_bgp + QUIT_DELAY))
3423 return 1;
3424 }
3425 #endif /* BGP */
3426
3427 return 0;
3428 }
3429
3430 if (main_quit == QUIT_SHUTDOWN)
3431 {
3432 static int dropped = 0;
3433 if (!dropped)
3434 {
3435 int i;
3436
3437 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3438 for (i = 1; i < MAXTUNNEL; i++)
3439 if (tunnel[i].ip || tunnel[i].state)
3440 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3441
3442 dropped = 1;
3443 }
3444 }
3445
3446 if (start_busy_wait == 0)
3447 start_busy_wait = TIME;
3448
3449 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3450 {
3451 if (!tunnel[i].controlc)
3452 continue;
3453
3454 if (last_talked != TIME)
3455 {
3456 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3457 last_talked = TIME;
3458 }
3459 return 1;
3460 }
3461
3462 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3463 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3464 {
3465 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3466 return 0;
3467 }
3468
3469 for (i = 1; i < MAXRADIUS; i++)
3470 {
3471 if (radius[i].state == RADIUSNULL)
3472 continue;
3473 if (radius[i].state == RADIUSWAIT)
3474 continue;
3475
3476 if (last_talked != TIME)
3477 {
3478 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3479 last_talked = TIME;
3480 }
3481 return 1;
3482 }
3483
3484 return 0;
3485 }
3486
3487 #ifdef HAVE_EPOLL
3488 # include <sys/epoll.h>
3489 #else
3490 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3491 # include "fake_epoll.h"
3492 #endif
3493
3494 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3495 #define BASE_FDS 6
3496
3497 // additional polled fds
3498 #ifdef BGP
3499 # define EXTRA_FDS BGP_NUM_PEERS
3500 #else
3501 # define EXTRA_FDS 0
3502 #endif
3503
3504 // main loop - gets packets on tun or udp and processes them
3505 static void mainloop(void)
3506 {
3507 int i;
3508 uint8_t buf[65536];
3509 clockt next_cluster_ping = 0; // send initial ping immediately
3510 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3511 int maxevent = sizeof(events)/sizeof(*events);
3512
3513 if ((epollfd = epoll_create(maxevent)) < 0)
3514 {
3515 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3516 exit(1);
3517 }
3518
3519 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3520 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
3521
3522 /* setup our fds to poll for input */
3523 {
3524 static struct event_data d[BASE_FDS];
3525 struct epoll_event e;
3526
3527 e.events = EPOLLIN;
3528 i = 0;
3529
3530 if (clifd >= 0)
3531 {
3532 d[i].type = FD_TYPE_CLI;
3533 e.data.ptr = &d[i++];
3534 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3535 }
3536
3537 d[i].type = FD_TYPE_CLUSTER;
3538 e.data.ptr = &d[i++];
3539 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3540
3541 d[i].type = FD_TYPE_TUN;
3542 e.data.ptr = &d[i++];
3543 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3544
3545 d[i].type = FD_TYPE_UDP;
3546 e.data.ptr = &d[i++];
3547 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3548
3549 d[i].type = FD_TYPE_CONTROL;
3550 e.data.ptr = &d[i++];
3551 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3552
3553 d[i].type = FD_TYPE_DAE;
3554 e.data.ptr = &d[i++];
3555 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3556 }
3557
3558 #ifdef BGP
3559 signal(SIGPIPE, SIG_IGN);
3560 bgp_setup(config->as_number);
3561 if (config->bind_address)
3562 bgp_add_route(config->bind_address, 0xffffffff);
3563
3564 for (i = 0; i < BGP_NUM_PEERS; i++)
3565 {
3566 if (config->neighbour[i].name[0])
3567 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3568 config->neighbour[i].as, config->neighbour[i].keepalive,
3569 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3570 }
3571 #endif /* BGP */
3572
3573 while (!main_quit || still_busy())
3574 {
3575 int more = 0;
3576 int n;
3577
3578
3579 if (main_reload)
3580 {
3581 main_reload = 0;
3582 read_config_file();
3583 config->reload_config++;
3584 }
3585
3586 if (config->reload_config)
3587 {
3588 config->reload_config = 0;
3589 update_config();
3590 }
3591
3592 #ifdef BGP
3593 bgp_set_poll();
3594 #endif /* BGP */
3595
3596 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3597 STAT(select_called);
3598
3599 TIME = now(NULL);
3600 if (n < 0)
3601 {
3602 if (errno == EINTR ||
3603 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3604 continue;
3605
3606 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3607 break; // exit
3608 }
3609
3610 if (n)
3611 {
3612 struct sockaddr_in addr;
3613 struct in_addr local;
3614 socklen_t alen;
3615 int c, s;
3616 int udp_ready = 0;
3617 int tun_ready = 0;
3618 int cluster_ready = 0;
3619 int udp_pkts = 0;
3620 int tun_pkts = 0;
3621 int cluster_pkts = 0;
3622 #ifdef BGP
3623 uint32_t bgp_events[BGP_NUM_PEERS];
3624 memset(bgp_events, 0, sizeof(bgp_events));
3625 #endif /* BGP */
3626
3627 for (c = n, i = 0; i < c; i++)
3628 {
3629 struct event_data *d = events[i].data.ptr;
3630
3631 switch (d->type)
3632 {
3633 case FD_TYPE_CLI: // CLI connections
3634 {
3635 int cli;
3636
3637 alen = sizeof(addr);
3638 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3639 {
3640 cli_do(cli);
3641 close(cli);
3642 }
3643 else
3644 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3645
3646 n--;
3647 break;
3648 }
3649
3650 // these are handled below, with multiple interleaved reads
3651 case FD_TYPE_CLUSTER: cluster_ready++; break;
3652 case FD_TYPE_TUN: tun_ready++; break;
3653 case FD_TYPE_UDP: udp_ready++; break;
3654
3655 case FD_TYPE_CONTROL: // nsctl commands
3656 alen = sizeof(addr);
3657 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3658 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3659 n--;
3660 break;
3661
3662 case FD_TYPE_DAE: // DAE requests
3663 alen = sizeof(addr);
3664 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3665 if (s > 0) processdae(buf, s, &addr, alen, &local);
3666 n--;
3667 break;
3668
3669 case FD_TYPE_RADIUS: // RADIUS response
3670 alen = sizeof(addr);
3671 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3672 if (s >= 0 && config->cluster_iam_master)
3673 {
3674 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3675 addr.sin_addr.s_addr == config->radiusserver[1])
3676 processrad(buf, s, d->index);
3677 else
3678 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3679 fmtaddr(addr.sin_addr.s_addr, 0));
3680 }
3681
3682 n--;
3683 break;
3684
3685 #ifdef BGP
3686 case FD_TYPE_BGP:
3687 bgp_events[d->index] = events[i].events;
3688 n--;
3689 break;
3690 #endif /* BGP */
3691
3692 default:
3693 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3694 }
3695 }
3696
3697 #ifdef BGP
3698 bgp_process(bgp_events);
3699 #endif /* BGP */
3700
3701 for (c = 0; n && c < config->multi_read_count; c++)
3702 {
3703 // L2TP
3704 if (udp_ready)
3705 {
3706 alen = sizeof(addr);
3707 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3708 {
3709 processudp(buf, s, &addr);
3710 udp_pkts++;
3711 }
3712 else
3713 {
3714 udp_ready = 0;
3715 n--;
3716 }
3717 }
3718
3719 // incoming IP
3720 if (tun_ready)
3721 {
3722 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3723 {
3724 processtun(buf, s);
3725 tun_pkts++;
3726 }
3727 else
3728 {
3729 tun_ready = 0;
3730 n--;
3731 }
3732 }
3733
3734 // cluster
3735 if (cluster_ready)
3736 {
3737 alen = sizeof(addr);
3738 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3739 {
3740 processcluster(buf, s, addr.sin_addr.s_addr);
3741 cluster_pkts++;
3742 }
3743 else
3744 {
3745 cluster_ready = 0;
3746 n--;
3747 }
3748 }
3749 }
3750
3751 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3752 STAT(multi_read_used);
3753
3754 if (c >= config->multi_read_count)
3755 {
3756 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3757 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3758
3759 STAT(multi_read_exceeded);
3760 more++;
3761 }
3762 }
3763
3764 if (time_changed)
3765 {
3766 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3767
3768 // Log current traffic stats
3769 snprintf(config->bandwidth, sizeof(config->bandwidth),
3770 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3771 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3772 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
3773 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
3774
3775 udp_tx = udp_rx = 0;
3776 udp_rx_pkt = eth_rx_pkt = 0;
3777 eth_tx = eth_rx = 0;
3778 time_changed = 0;
3779
3780 if (config->dump_speed)
3781 printf("%s\n", config->bandwidth);
3782
3783 // Update the internal time counter
3784 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3785
3786 {
3787 // Run timer hooks
3788 struct param_timer p = { time_now };
3789 run_plugins(PLUGIN_TIMER, &p);
3790 }
3791 }
3792
3793 // Runs on every machine (master and slaves).
3794 if (next_cluster_ping <= TIME)
3795 {
3796 // Check to see which of the cluster is still alive..
3797
3798 cluster_send_ping(basetime); // Only does anything if we're a slave
3799 cluster_check_master(); // ditto.
3800
3801 cluster_heartbeat(); // Only does anything if we're a master.
3802 cluster_check_slaves(); // ditto.
3803
3804 master_update_counts(); // If we're a slave, send our byte counters to our master.
3805
3806 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
3807 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
3808 else
3809 next_cluster_ping = TIME + config->cluster_hb_interval;
3810 }
3811
3812 if (!config->cluster_iam_master)
3813 continue;
3814
3815 // Run token bucket filtering queue..
3816 // Only run it every 1/10th of a second.
3817 {
3818 static clockt last_run = 0;
3819 if (last_run != TIME)
3820 {
3821 last_run = TIME;
3822 tbf_run_timer();
3823 }
3824 }
3825
3826 // Handle timeouts, retries etc.
3827 {
3828 static double last_clean = 0;
3829 double this_clean;
3830 double diff;
3831
3832 TIME = now(&this_clean);
3833 diff = this_clean - last_clean;
3834
3835 // Run during idle time (after we've handled
3836 // all incoming packets) or every 1/10th sec
3837 if (!more || diff > 0.1)
3838 {
3839 regular_cleanups(diff);
3840 last_clean = this_clean;
3841 }
3842 }
3843
3844 if (*config->accounting_dir)
3845 {
3846 static clockt next_acct = 0;
3847 static clockt next_shut_acct = 0;
3848
3849 if (next_acct <= TIME)
3850 {
3851 // Dump accounting data
3852 next_acct = TIME + ACCT_TIME;
3853 next_shut_acct = TIME + ACCT_SHUT_TIME;
3854 dump_acct_info(1);
3855 }
3856 else if (next_shut_acct <= TIME)
3857 {
3858 // Dump accounting data for shutdown sessions
3859 next_shut_acct = TIME + ACCT_SHUT_TIME;
3860 if (shut_acct_n)
3861 dump_acct_info(0);
3862 }
3863 }
3864 }
3865
3866 // Are we the master and shutting down??
3867 if (config->cluster_iam_master)
3868 cluster_heartbeat(); // Flush any queued changes..
3869
3870 // Ok. Notify everyone we're shutting down. If we're
3871 // the master, this will force an election.
3872 cluster_send_ping(0);
3873
3874 //
3875 // Important!!! We MUST not process any packets past this point!
3876 LOG(1, 0, 0, "Shutdown complete\n");
3877 }
3878
3879 static void stripdomain(char *host)
3880 {
3881 char *p;
3882
3883 if ((p = strchr(host, '.')))
3884 {
3885 char *domain = 0;
3886 char _domain[1024];
3887
3888 // strip off domain
3889 FILE *resolv = fopen("/etc/resolv.conf", "r");
3890 if (resolv)
3891 {
3892 char buf[1024];
3893 char *b;
3894
3895 while (fgets(buf, sizeof(buf), resolv))
3896 {
3897 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
3898 continue;
3899
3900 if (!isspace(buf[6]))
3901 continue;
3902
3903 b = buf + 7;
3904 while (isspace(*b)) b++;
3905
3906 if (*b)
3907 {
3908 char *d = b;
3909 while (*b && !isspace(*b)) b++;
3910 *b = 0;
3911 if (buf[0] == 'd') // domain is canonical
3912 {
3913 domain = d;
3914 break;
3915 }
3916
3917 // first search line
3918 if (!domain)
3919 {
3920 // hold, may be subsequent domain line
3921 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
3922 domain = _domain;
3923 }
3924 }
3925 }
3926
3927 fclose(resolv);
3928 }
3929
3930 if (domain)
3931 {
3932 int hl = strlen(host);
3933 int dl = strlen(domain);
3934 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
3935 host[hl -dl - 1] = 0;
3936 }
3937 else
3938 {
3939 *p = 0; // everything after first dot
3940 }
3941 }
3942 }
3943
3944 // Init data structures
3945 static void initdata(int optdebug, char *optconfig)
3946 {
3947 int i;
3948
3949 if (!(config = shared_malloc(sizeof(configt))))
3950 {
3951 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
3952 exit(1);
3953 }
3954
3955 memset(config, 0, sizeof(configt));
3956 time(&config->start_time);
3957 strncpy(config->config_file, optconfig, strlen(optconfig));
3958 config->debug = optdebug;
3959 config->num_tbfs = MAXTBFS;
3960 config->rl_rate = 28; // 28kbps
3961 config->cluster_mcast_ttl = 1;
3962 config->cluster_master_min_adv = 1;
3963 config->ppp_restart_time = 3;
3964 config->ppp_max_configure = 10;
3965 config->ppp_max_failure = 5;
3966 config->kill_timedout_sessions = 1;
3967 strcpy(config->random_device, RANDOMDEVICE);
3968
3969 log_stream = stderr;
3970
3971 #ifdef RINGBUFFER
3972 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
3973 {
3974 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
3975 exit(1);
3976 }
3977 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
3978 #endif
3979
3980 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
3981 {
3982 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
3983 exit(1);
3984 }
3985 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
3986 {
3987 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
3988 exit(1);
3989 }
3990 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
3991 {
3992 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
3993 exit(1);
3994 }
3995 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
3996 {
3997 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
3998 exit(1);
3999 }
4000 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4001 {
4002 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4003 exit(1);
4004 }
4005
4006 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4007 {
4008 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4009 exit(1);
4010 }
4011
4012 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4013 {
4014 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4015 exit(1);
4016 }
4017
4018 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4019 {
4020 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4021 exit(1);
4022 }
4023
4024 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4025 {
4026 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4027 exit(1);
4028 }
4029 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4030
4031 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4032 {
4033 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4034 exit(1);
4035 }
4036 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4037
4038 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4039 {
4040 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4041 exit(1);
4042 }
4043 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4044
4045 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4046 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4047 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4048 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4049 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4050
4051 // Put all the sessions on the free list marked as undefined.
4052 for (i = 1; i < MAXSESSION; i++)
4053 {
4054 session[i].next = i + 1;
4055 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4056 }
4057 session[MAXSESSION - 1].next = 0;
4058 sessionfree = 1;
4059
4060 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4061 for (i = 1; i < MAXTUNNEL; i++)
4062 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4063
4064 for (i = 1; i < MAXBUNDLE; i++) {
4065 bundle[i].state = BUNDLEUNDEF;
4066 }
4067
4068 if (!*hostname)
4069 {
4070 // Grab my hostname unless it's been specified
4071 gethostname(hostname, sizeof(hostname));
4072 stripdomain(hostname);
4073 }
4074
4075 _statistics->start_time = _statistics->last_reset = time(NULL);
4076
4077 #ifdef BGP
4078 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4079 {
4080 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4081 exit(1);
4082 }
4083 #endif /* BGP */
4084 }
4085
4086 static int assign_ip_address(sessionidt s)
4087 {
4088 uint32_t i;
4089 int best = -1;
4090 time_t best_time = time_now;
4091 char *u = session[s].user;
4092 char reuse = 0;
4093
4094
4095 CSTAT(assign_ip_address);
4096
4097 for (i = 1; i < ip_pool_size; i++)
4098 {
4099 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4100 continue;
4101
4102 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4103 {
4104 best = i;
4105 reuse = 1;
4106 break;
4107 }
4108
4109 if (ip_address_pool[i].last < best_time)
4110 {
4111 best = i;
4112 if (!(best_time = ip_address_pool[i].last))
4113 break; // never used, grab this one
4114 }
4115 }
4116
4117 if (best < 0)
4118 {
4119 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4120 return 0;
4121 }
4122
4123 session[s].ip = ip_address_pool[best].address;
4124 session[s].ip_pool_index = best;
4125 ip_address_pool[best].assigned = 1;
4126 ip_address_pool[best].last = time_now;
4127 ip_address_pool[best].session = s;
4128 if (session[s].walled_garden)
4129 /* Don't track addresses of users in walled garden (note: this
4130 means that their address isn't "sticky" even if they get
4131 un-gardened). */
4132 ip_address_pool[best].user[0] = 0;
4133 else
4134 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4135
4136 STAT(ip_allocated);
4137 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4138 reuse ? "Reusing" : "Allocating", best);
4139
4140 return 1;
4141 }
4142
4143 static void free_ip_address(sessionidt s)
4144 {
4145 int i = session[s].ip_pool_index;
4146
4147
4148 CSTAT(free_ip_address);
4149
4150 if (!session[s].ip)
4151 return; // what the?
4152
4153 if (i < 0) // Is this actually part of the ip pool?
4154 i = 0;
4155
4156 STAT(ip_freed);
4157 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4158 session[s].ip = 0;
4159 ip_address_pool[i].assigned = 0;
4160 ip_address_pool[i].session = 0;
4161 ip_address_pool[i].last = time_now;
4162 }
4163
4164 //
4165 // Fsck the address pool against the session table.
4166 // Normally only called when we become a master.
4167 //
4168 // This isn't perfect: We aren't keep tracking of which
4169 // users used to have an IP address.
4170 //
4171 void rebuild_address_pool(void)
4172 {
4173 int i;
4174
4175 //
4176 // Zero the IP pool allocation, and build
4177 // a map from IP address to pool index.
4178 for (i = 1; i < MAXIPPOOL; ++i)
4179 {
4180 ip_address_pool[i].assigned = 0;
4181 ip_address_pool[i].session = 0;
4182 if (!ip_address_pool[i].address)
4183 continue;
4184
4185 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4186 }
4187
4188 for (i = 0; i < MAXSESSION; ++i)
4189 {
4190 int ipid;
4191 if (!(session[i].opened && session[i].ip))
4192 continue;
4193
4194 ipid = - lookup_ipmap(htonl(session[i].ip));
4195
4196 if (session[i].ip_pool_index < 0)
4197 {
4198 // Not allocated out of the pool.
4199 if (ipid < 1) // Not found in the pool either? good.
4200 continue;
4201
4202 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4203 i, fmtaddr(session[i].ip, 0), ipid);
4204
4205 // Fall through and process it as part of the pool.
4206 }
4207
4208
4209 if (ipid > MAXIPPOOL || ipid < 0)
4210 {
4211 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4212 ipid = -1;
4213 session[i].ip_pool_index = ipid;
4214 continue;
4215 }
4216
4217 ip_address_pool[ipid].assigned = 1;
4218 ip_address_pool[ipid].session = i;
4219 ip_address_pool[ipid].last = time_now;
4220 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4221 session[i].ip_pool_index = ipid;
4222 cache_ipmap(session[i].ip, i); // Fix the ip map.
4223 }
4224 }
4225
4226 //
4227 // Fix the address pool to match a changed session.
4228 // (usually when the master sends us an update).
4229 static void fix_address_pool(int sid)
4230 {
4231 int ipid;
4232
4233 ipid = session[sid].ip_pool_index;
4234
4235 if (ipid > ip_pool_size)
4236 return; // Ignore it. rebuild_address_pool will fix it up.
4237
4238 if (ip_address_pool[ipid].address != session[sid].ip)
4239 return; // Just ignore it. rebuild_address_pool will take care of it.
4240
4241 ip_address_pool[ipid].assigned = 1;
4242 ip_address_pool[ipid].session = sid;
4243 ip_address_pool[ipid].last = time_now;
4244 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4245 }
4246
4247 //
4248 // Add a block of addresses to the IP pool to hand out.
4249 //
4250 static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
4251 {
4252 int i;
4253 if (mask == 0)
4254 mask = 0xffffffff; // Host route only.
4255
4256 addr &= mask;
4257
4258 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4259 return ;
4260
4261 for (i = addr ;(i & mask) == addr; ++i)
4262 {
4263 if ((i & 0xff) == 0 || (i&0xff) == 255)
4264 continue; // Skip 0 and broadcast addresses.
4265
4266 ip_address_pool[ip_pool_size].address = i;
4267 ip_address_pool[ip_pool_size].assigned = 0;
4268 ++ip_pool_size;
4269 if (ip_pool_size >= MAXIPPOOL)
4270 {
4271 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4272 return;
4273 }
4274 }
4275 }
4276
4277 // Initialize the IP address pool
4278 static void initippool()
4279 {
4280 FILE *f;
4281 char *p;
4282 char buf[4096];
4283 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4284
4285 if (!(f = fopen(IPPOOLFILE, "r")))
4286 {
4287 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4288 exit(1);
4289 }
4290
4291 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4292 {
4293 char *pool = buf;
4294 buf[4095] = 0; // Force it to be zero terminated/
4295
4296 if (*buf == '#' || *buf == '\n')
4297 continue; // Skip comments / blank lines
4298 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4299 if ((p = (char *)strchr(buf, ':')))
4300 {
4301 in_addr_t src;
4302 *p = '\0';
4303 src = inet_addr(buf);
4304 if (src == INADDR_NONE)
4305 {
4306 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4307 exit(1);
4308 }
4309 // This entry is for a specific IP only
4310 if (src != config->bind_address)
4311 continue;
4312 *p = ':';
4313 pool = p+1;
4314 }
4315 if ((p = (char *)strchr(pool, '/')))
4316 {
4317 // It's a range
4318 int numbits = 0;
4319 in_addr_t start = 0, mask = 0;
4320
4321 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4322 *p++ = 0;
4323 if (!*p || !(numbits = atoi(p)))
4324 {
4325 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4326 continue;
4327 }
4328 start = ntohl(inet_addr(pool));
4329 mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
4330
4331 // Add a static route for this pool
4332 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
4333 fmtaddr(htonl(start), 0), 32 + mask);
4334
4335 routeset(0, start, mask, 0, 1);
4336
4337 add_to_ip_pool(start, mask);
4338 }
4339 else
4340 {
4341 // It's a single ip address
4342 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4343 }
4344 }
4345 fclose(f);
4346 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4347 }
4348
4349 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4350 {
4351 struct sockaddr_in snoop_addr = {0};
4352 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4353 return;
4354
4355 snoop_addr.sin_family = AF_INET;
4356 snoop_addr.sin_addr.s_addr = destination;
4357 snoop_addr.sin_port = ntohs(port);
4358
4359 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4360 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4361 htons(snoop_addr.sin_port));
4362
4363 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4364 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4365
4366 STAT(packets_snooped);
4367 }
4368
4369 static int dump_session(FILE **f, sessiont *s)
4370 {
4371 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4372 return 1;
4373
4374 if (!*f)
4375 {
4376 char filename[1024];
4377 char timestr[64];
4378 time_t now = time(NULL);
4379
4380 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4381 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4382
4383 if (!(*f = fopen(filename, "w")))
4384 {
4385 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4386 return 0;
4387 }
4388
4389 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4390 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4391 "# host: %s\n"
4392 "# endpoint: %s\n"
4393 "# time: %ld\n"
4394 "# uptime: %ld\n"
4395 "# format: username ip qos uptxoctets downrxoctets\n",
4396 hostname,
4397 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4398 now,
4399 now - basetime);
4400 }
4401
4402 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4403 fprintf(*f, "%s %s %d %u %u\n",
4404 s->user, // username
4405 fmtaddr(htonl(s->ip), 0), // ip
4406 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4407 (uint32_t) s->cin_delta, // uptxoctets
4408 (uint32_t) s->cout_delta); // downrxoctets
4409
4410 s->cin_delta = s->cout_delta = 0;
4411
4412 return 1;
4413 }
4414
4415 static void dump_acct_info(int all)
4416 {
4417 int i;
4418 FILE *f = NULL;
4419
4420
4421 CSTAT(dump_acct_info);
4422
4423 if (shut_acct_n)
4424 {
4425 for (i = 0; i < shut_acct_n; i++)
4426 dump_session(&f, &shut_acct[i]);
4427
4428 shut_acct_n = 0;
4429 }
4430
4431 if (all)
4432 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4433 dump_session(&f, &session[i]);
4434
4435 if (f)
4436 fclose(f);
4437 }
4438
4439 // Main program
4440 int main(int argc, char *argv[])
4441 {
4442 int i;
4443 int optdebug = 0;
4444 char *optconfig = CONFIGFILE;
4445
4446 time(&basetime); // start clock
4447
4448 // scan args
4449 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4450 {
4451 switch (i)
4452 {
4453 case 'd':
4454 if (fork()) exit(0);
4455 setsid();
4456 freopen("/dev/null", "r", stdin);
4457 freopen("/dev/null", "w", stdout);
4458 freopen("/dev/null", "w", stderr);
4459 break;
4460 case 'v':
4461 optdebug++;
4462 break;
4463 case 'c':
4464 optconfig = optarg;
4465 break;
4466 case 'h':
4467 snprintf(hostname, sizeof(hostname), "%s", optarg);
4468 break;
4469 default:
4470 printf("Args are:\n"
4471 "\t-d\t\tDetach from terminal\n"
4472 "\t-c <file>\tConfig file\n"
4473 "\t-h <hostname>\tForce hostname\n"
4474 "\t-v\t\tDebug\n");
4475
4476 return (0);
4477 break;
4478 }
4479 }
4480
4481 // Start the timer routine off
4482 time(&time_now);
4483 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4484
4485 initplugins();
4486 initdata(optdebug, optconfig);
4487
4488 init_cli(hostname);
4489 read_config_file();
4490 update_config();
4491 init_tbf(config->num_tbfs);
4492
4493 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4494 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4495 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4496 {
4497 struct rlimit rlim;
4498 rlim.rlim_cur = RLIM_INFINITY;
4499 rlim.rlim_max = RLIM_INFINITY;
4500 // Remove the maximum core size
4501 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4502 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4503
4504 // Make core dumps go to /tmp
4505 chdir("/tmp");
4506 }
4507
4508 if (config->scheduler_fifo)
4509 {
4510 int ret;
4511 struct sched_param params = {0};
4512 params.sched_priority = 1;
4513
4514 if (get_nprocs() < 2)
4515 {
4516 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4517 config->scheduler_fifo = 0;
4518 }
4519 else
4520 {
4521 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4522 {
4523 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4524 }
4525 else
4526 {
4527 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4528 config->scheduler_fifo = 0;
4529 }
4530 }
4531 }
4532
4533 /* Set up the cluster communications port. */
4534 if (cluster_init() < 0)
4535 exit(1);
4536
4537 inittun();
4538 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4539
4540 initudp();
4541 initrad();
4542 initippool();
4543
4544 // seed prng
4545 {
4546 unsigned seed = time_now ^ getpid();
4547 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4548 srand(seed);
4549 }
4550
4551 signal(SIGHUP, sighup_handler);
4552 signal(SIGCHLD, sigchild_handler);
4553 signal(SIGTERM, shutdown_handler);
4554 signal(SIGINT, shutdown_handler);
4555 signal(SIGQUIT, shutdown_handler);
4556
4557 // Prevent us from getting paged out
4558 if (config->lock_pages)
4559 {
4560 if (!mlockall(MCL_CURRENT))
4561 LOG(1, 0, 0, "Locking pages into memory\n");
4562 else
4563 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4564 }
4565
4566 mainloop();
4567
4568 /* remove plugins (so cleanup code gets run) */
4569 plugins_done();
4570
4571 // Remove the PID file if we wrote it
4572 if (config->wrote_pid && *config->pid_file == '/')
4573 unlink(config->pid_file);
4574
4575 /* kill CLI children */
4576 signal(SIGTERM, SIG_IGN);
4577 kill(0, SIGTERM);
4578 return 0;
4579 }
4580
4581 static void sighup_handler(int sig)
4582 {
4583 main_reload++;
4584 }
4585
4586 static void shutdown_handler(int sig)
4587 {
4588 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4589 }
4590
4591 static void sigchild_handler(int sig)
4592 {
4593 while (waitpid(-1, NULL, WNOHANG) > 0)
4594 ;
4595 }
4596
4597 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4598 {
4599 MD5_CTX ctx;
4600 *challenge_response = NULL;
4601
4602 if (!*config->l2tp_secret)
4603 {
4604 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4605 return;
4606 }
4607
4608 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4609
4610 *challenge_response = calloc(17, 1);
4611
4612 MD5_Init(&ctx);
4613 MD5_Update(&ctx, &id, 1);
4614 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4615 MD5_Update(&ctx, challenge, challenge_length);
4616 MD5_Final(*challenge_response, &ctx);
4617
4618 return;
4619 }
4620
4621 static int facility_value(char *name)
4622 {
4623 int i;
4624 for (i = 0; facilitynames[i].c_name; i++)
4625 {
4626 if (strcmp(facilitynames[i].c_name, name) == 0)
4627 return facilitynames[i].c_val;
4628 }
4629 return 0;
4630 }
4631
4632 static void update_config()
4633 {
4634 int i;
4635 char *p;
4636 static int timeout = 0;
4637 static int interval = 0;
4638
4639 // Update logging
4640 closelog();
4641 syslog_log = 0;
4642 if (log_stream)
4643 {
4644 if (log_stream != stderr)
4645 fclose(log_stream);
4646
4647 log_stream = NULL;
4648 }
4649
4650 if (*config->log_filename)
4651 {
4652 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4653 {
4654 char *p = config->log_filename + 7;
4655 if (*p)
4656 {
4657 openlog("l2tpns", LOG_PID, facility_value(p));
4658 syslog_log = 1;
4659 }
4660 }
4661 else if (strchr(config->log_filename, '/') == config->log_filename)
4662 {
4663 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4664 {
4665 fseek(log_stream, 0, SEEK_END);
4666 setbuf(log_stream, NULL);
4667 }
4668 else
4669 {
4670 log_stream = stderr;
4671 setbuf(log_stream, NULL);
4672 }
4673 }
4674 }
4675 else
4676 {
4677 log_stream = stderr;
4678 setbuf(log_stream, NULL);
4679 }
4680
4681 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4682 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4683
4684 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4685 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4686 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4687
4688 // reset MRU/MSS globals
4689 MRU = config->l2tp_mtu - L2TP_HDRS;
4690 if (MRU > PPPoE_MRU)
4691 MRU = PPPoE_MRU;
4692
4693 MSS = MRU - TCP_HDRS;
4694
4695 // Update radius
4696 config->numradiusservers = 0;
4697 for (i = 0; i < MAXRADSERVER; i++)
4698 if (config->radiusserver[i])
4699 {
4700 config->numradiusservers++;
4701 // Set radius port: if not set, take the port from the
4702 // first radius server. For the first radius server,
4703 // take the #defined default value from l2tpns.h
4704
4705 // test twice, In case someone works with
4706 // a secondary radius server without defining
4707 // a primary one, this will work even then.
4708 if (i > 0 && !config->radiusport[i])
4709 config->radiusport[i] = config->radiusport[i-1];
4710 if (!config->radiusport[i])
4711 config->radiusport[i] = RADPORT;
4712 }
4713
4714 if (!config->numradiusservers)
4715 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4716
4717 // parse radius_authtypes_s
4718 config->radius_authtypes = config->radius_authprefer = 0;
4719 p = config->radius_authtypes_s;
4720 while (p && *p)
4721 {
4722 char *s = strpbrk(p, " \t,");
4723 int type = 0;
4724
4725 if (s)
4726 {
4727 *s++ = 0;
4728 while (*s == ' ' || *s == '\t')
4729 s++;
4730
4731 if (!*s)
4732 s = 0;
4733 }
4734
4735 if (!strncasecmp("chap", p, strlen(p)))
4736 type = AUTHCHAP;
4737 else if (!strncasecmp("pap", p, strlen(p)))
4738 type = AUTHPAP;
4739 else
4740 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4741
4742 config->radius_authtypes |= type;
4743 if (!config->radius_authprefer)
4744 config->radius_authprefer = type;
4745
4746 p = s;
4747 }
4748
4749 if (!config->radius_authtypes)
4750 {
4751 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4752 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4753 }
4754
4755 // normalise radius_authtypes_s
4756 if (config->radius_authprefer == AUTHPAP)
4757 {
4758 strcpy(config->radius_authtypes_s, "pap");
4759 if (config->radius_authtypes & AUTHCHAP)
4760 strcat(config->radius_authtypes_s, ", chap");
4761 }
4762 else
4763 {
4764 strcpy(config->radius_authtypes_s, "chap");
4765 if (config->radius_authtypes & AUTHPAP)
4766 strcat(config->radius_authtypes_s, ", pap");
4767 }
4768
4769 if (!config->radius_dae_port)
4770 config->radius_dae_port = DAEPORT;
4771
4772 // re-initialise the random number source
4773 initrandom(config->random_device);
4774
4775 // Update plugins
4776 for (i = 0; i < MAXPLUGINS; i++)
4777 {
4778 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4779 continue;
4780
4781 if (*config->plugins[i])
4782 {
4783 // Plugin added
4784 add_plugin(config->plugins[i]);
4785 }
4786 else if (*config->old_plugins[i])
4787 {
4788 // Plugin removed
4789 remove_plugin(config->old_plugins[i]);
4790 }
4791 }
4792
4793 // Guest change
4794 guest_accounts_num = 0;
4795 char *p2 = config->guest_user;
4796 while (p2 && *p2)
4797 {
4798 char *s = strpbrk(p2, " \t,");
4799 if (s)
4800 {
4801 *s++ = 0;
4802 while (*s == ' ' || *s == '\t')
4803 s++;
4804
4805 if (!*s)
4806 s = 0;
4807 }
4808
4809 strcpy(guest_users[guest_accounts_num], p2);
4810 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
4811 guest_accounts_num++;
4812 p2 = s;
4813 }
4814 // Rebuild the guest_user array
4815 strcpy(config->guest_user, "");
4816 int ui = 0;
4817 for (ui=0; ui<guest_accounts_num; ui++)
4818 {
4819 strcat(config->guest_user, guest_users[ui]);
4820 if (ui<guest_accounts_num-1)
4821 {
4822 strcat(config->guest_user, ",");
4823 }
4824 }
4825
4826
4827 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
4828 if (!config->multi_read_count) config->multi_read_count = 10;
4829 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
4830 if (!*config->cluster_interface)
4831 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
4832
4833 if (!config->cluster_hb_interval)
4834 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
4835
4836 if (!config->cluster_hb_timeout)
4837 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
4838
4839 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
4840 {
4841 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4842 // late, ensure we're sufficiently larger than that
4843 int t = 4 * config->cluster_hb_interval + 11;
4844
4845 if (config->cluster_hb_timeout < t)
4846 {
4847 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
4848 config->cluster_hb_timeout = t;
4849 }
4850
4851 // Push timing changes to the slaves immediately if we're the master
4852 if (config->cluster_iam_master)
4853 cluster_heartbeat();
4854
4855 interval = config->cluster_hb_interval;
4856 timeout = config->cluster_hb_timeout;
4857 }
4858
4859 // Write PID file
4860 if (*config->pid_file == '/' && !config->wrote_pid)
4861 {
4862 FILE *f;
4863 if ((f = fopen(config->pid_file, "w")))
4864 {
4865 fprintf(f, "%d\n", getpid());
4866 fclose(f);
4867 config->wrote_pid = 1;
4868 }
4869 else
4870 {
4871 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
4872 }
4873 }
4874 }
4875
4876 static void read_config_file()
4877 {
4878 FILE *f;
4879
4880 if (!config->config_file) return;
4881 if (!(f = fopen(config->config_file, "r")))
4882 {
4883 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
4884 return;
4885 }
4886
4887 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
4888 cli_do_file(f);
4889 LOG(3, 0, 0, "Done reading config file\n");
4890 fclose(f);
4891 }
4892
4893 int sessionsetup(sessionidt s, tunnelidt t)
4894 {
4895 // A session now exists, set it up
4896 in_addr_t ip;
4897 char *user;
4898 sessionidt i;
4899 int r;
4900
4901 CSTAT(sessionsetup);
4902
4903 LOG(3, s, t, "Doing session setup for session\n");
4904
4905 // Join a bundle if the MRRU option is accepted
4906 if(session[s].mrru > 0 && session[s].bundle == 0)
4907 {
4908 LOG(3, s, t, "This session can be part of multilink bundle\n");
4909 if (join_bundle(s) > 0)
4910 cluster_send_bundle(session[s].bundle);
4911 else
4912 {
4913 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
4914 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
4915 return 0;
4916 }
4917 }
4918
4919 if (!session[s].ip)
4920 {
4921 assign_ip_address(s);
4922 if (!session[s].ip)
4923 {
4924 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
4925 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
4926 return 0;
4927 }
4928 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
4929 fmtaddr(htonl(session[s].ip), 0));
4930 }
4931
4932
4933 // Make sure this is right
4934 session[s].tunnel = t;
4935
4936 // zap old sessions with same IP and/or username
4937 // Don't kill gardened sessions - doing so leads to a DoS
4938 // from someone who doesn't need to know the password
4939 {
4940 ip = session[s].ip;
4941 user = session[s].user;
4942 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4943 {
4944 if (i == s) continue;
4945 if (!session[s].opened) continue;
4946 // Allow duplicate sessions for multilink ones of the same bundle.
4947 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
4948 continue;
4949 if (ip == session[i].ip)
4950 {
4951 sessionkill(i, "Duplicate IP address");
4952 continue;
4953 }
4954
4955 if (config->allow_duplicate_users) continue;
4956 if (session[s].walled_garden || session[i].walled_garden) continue;
4957 // Guest change
4958 int found = 0;
4959 int gu;
4960 for (gu = 0; gu < guest_accounts_num; gu++)
4961 {
4962 if (!strcasecmp(user, guest_users[gu]))
4963 {
4964 found = 1;
4965 break;
4966 }
4967 }
4968 if (found) continue;
4969
4970 // Drop the new session in case of duplicate sessionss, not the old one.
4971 if (!strcasecmp(user, session[i].user))
4972 sessionkill(i, "Duplicate session for users");
4973 }
4974 }
4975
4976 // no need to set a route for the same IP address of the bundle
4977 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
4978 {
4979 int routed = 0;
4980
4981 // Add the route for this session.
4982 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
4983 {
4984 if ((session[s].ip & session[s].route[r].mask) ==
4985 (session[s].route[r].ip & session[s].route[r].mask))
4986 routed++;
4987
4988 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
4989 }
4990
4991 // Static IPs need to be routed if not already
4992 // convered by a Framed-Route. Anything else is part
4993 // of the IP address pool and is already routed, it
4994 // just needs to be added to the IP cache.
4995 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4996 if (session[s].ip_pool_index == -1) // static ip
4997 {
4998 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
4999 }
5000 else
5001 cache_ipmap(session[s].ip, s);
5002 }
5003
5004 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5005 lcp_open(s, t); // transition to Network phase and send initial IPCP
5006
5007 // Run the plugin's against this new session.
5008 {
5009 struct param_new_session data = { &tunnel[t], &session[s] };
5010 run_plugins(PLUGIN_NEW_SESSION, &data);
5011 }
5012
5013 // Allocate TBFs if throttled
5014 if (session[s].throttle_in || session[s].throttle_out)
5015 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5016
5017 session[s].last_packet = session[s].last_data = time_now;
5018
5019 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5020 fmtaddr(htonl(session[s].ip), 0),
5021 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5022
5023 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5024
5025 return 1; // RADIUS OK and IP allocated, done...
5026 }
5027
5028 //
5029 // This session just got dropped on us by the master or something.
5030 // Make sure our tables up up to date...
5031 //
5032 int load_session(sessionidt s, sessiont *new)
5033 {
5034 int i;
5035 int newip = 0;
5036
5037 // Sanity checks.
5038 if (new->ip_pool_index >= MAXIPPOOL ||
5039 new->tunnel >= MAXTUNNEL)
5040 {
5041 LOG(0, s, 0, "Strange session update received!\n");
5042 // FIXME! What to do here?
5043 return 0;
5044 }
5045
5046 //
5047 // Ok. All sanity checks passed. Now we're committed to
5048 // loading the new session.
5049 //
5050
5051 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5052
5053 // See if routes/ip cache need updating
5054 if (new->ip != session[s].ip)
5055 newip++;
5056
5057 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5058 if (new->route[i].ip != session[s].route[i].ip ||
5059 new->route[i].mask != session[s].route[i].mask)
5060 newip++;
5061
5062 // needs update
5063 if (newip)
5064 {
5065 int routed = 0;
5066
5067 // remove old routes...
5068 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5069 {
5070 if ((session[s].ip & session[s].route[i].mask) ==
5071 (session[s].route[i].ip & session[s].route[i].mask))
5072 routed++;
5073
5074 routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
5075 }
5076
5077 // ...ip
5078 if (session[s].ip)
5079 {
5080 if (session[s].ip_pool_index == -1) // static IP
5081 {
5082 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5083 }
5084 else // It's part of the IP pool, remove it manually.
5085 uncache_ipmap(session[s].ip);
5086 }
5087
5088 routed = 0;
5089
5090 // add new routes...
5091 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5092 {
5093 if ((new->ip & new->route[i].mask) ==
5094 (new->route[i].ip & new->route[i].mask))
5095 routed++;
5096
5097 routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
5098 }
5099
5100 // ...ip
5101 if (new->ip)
5102 {
5103 // If there's a new one, add it.
5104 if (new->ip_pool_index == -1)
5105 {
5106 if (!routed) routeset(s, new->ip, 0, 0, 1);
5107 }
5108 else
5109 cache_ipmap(new->ip, s);
5110 }
5111 }
5112
5113 // check v6 routing
5114 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5115 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5116
5117 // check filters
5118 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5119 {
5120 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5121 new->filter_in = 0;
5122 }
5123
5124 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5125 {
5126 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5127 new->filter_out = 0;
5128 }
5129
5130 if (new->filter_in != session[s].filter_in)
5131 {
5132 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5133 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5134 }
5135
5136 if (new->filter_out != session[s].filter_out)
5137 {
5138 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5139 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5140 }
5141
5142 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5143 // for walking the sessions to forward byte counts to the master.
5144 config->cluster_highest_sessionid = s;
5145
5146 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5147
5148 // Do fixups into address pool.
5149 if (new->ip_pool_index != -1)
5150 fix_address_pool(s);
5151
5152 return 1;
5153 }
5154
5155 static void initplugins()
5156 {
5157 int i;
5158
5159 loaded_plugins = ll_init();
5160 // Initialize the plugins to nothing
5161 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5162 plugins[i] = ll_init();
5163 }
5164
5165 static void *open_plugin(char *plugin_name, int load)
5166 {
5167 char path[256] = "";
5168
5169 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5170 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5171 return dlopen(path, RTLD_NOW);
5172 }
5173
5174 // plugin callback to get a config value
5175 static void *getconfig(char *key, enum config_typet type)
5176 {
5177 int i;
5178
5179 for (i = 0; config_values[i].key; i++)
5180 {
5181 if (!strcmp(config_values[i].key, key))
5182 {
5183 if (config_values[i].type == type)
5184 return ((void *) config) + config_values[i].offset;
5185
5186 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5187 key, type, config_values[i].type);
5188
5189 return 0;
5190 }
5191 }
5192
5193 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5194 return 0;
5195 }
5196
5197 static int add_plugin(char *plugin_name)
5198 {
5199 static struct pluginfuncs funcs = {
5200 _log,
5201 _log_hex,
5202 fmtaddr,
5203 sessionbyuser,
5204 sessiontbysessionidt,
5205 sessionidtbysessiont,
5206 radiusnew,
5207 radiussend,
5208 getconfig,
5209 sessionshutdown,
5210 sessionkill,
5211 throttle_session,
5212 cluster_send_session,
5213 };
5214
5215 void *p = open_plugin(plugin_name, 1);
5216 int (*initfunc)(struct pluginfuncs *);
5217 int i;
5218
5219 if (!p)
5220 {
5221 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5222 return -1;
5223 }
5224
5225 if (ll_contains(loaded_plugins, p))
5226 {
5227 dlclose(p);
5228 return 0; // already loaded
5229 }
5230
5231 {
5232 int *v = dlsym(p, "plugin_api_version");
5233 if (!v || *v != PLUGIN_API_VERSION)
5234 {
5235 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5236 dlclose(p);
5237 return -1;
5238 }
5239 }
5240
5241 if ((initfunc = dlsym(p, "plugin_init")))
5242 {
5243 if (!initfunc(&funcs))
5244 {
5245 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5246 dlclose(p);
5247 return -1;
5248 }
5249 }
5250
5251 ll_push(loaded_plugins, p);
5252
5253 for (i = 0; i < max_plugin_functions; i++)
5254 {
5255 void *x;
5256 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5257 {
5258 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5259 ll_push(plugins[i], x);
5260 }
5261 }
5262
5263 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5264 return 1;
5265 }
5266
5267 static void run_plugin_done(void *plugin)
5268 {
5269 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5270
5271 if (donefunc)
5272 donefunc();
5273 }
5274
5275 static int remove_plugin(char *plugin_name)
5276 {
5277 void *p = open_plugin(plugin_name, 0);
5278 int loaded = 0;
5279
5280 if (!p)
5281 return -1;
5282
5283 if (ll_contains(loaded_plugins, p))
5284 {
5285 int i;
5286 for (i = 0; i < max_plugin_functions; i++)
5287 {
5288 void *x;
5289 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5290 ll_delete(plugins[i], x);
5291 }
5292
5293 ll_delete(loaded_plugins, p);
5294 run_plugin_done(p);
5295 loaded = 1;
5296 }
5297
5298 dlclose(p);
5299 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5300 return loaded;
5301 }
5302
5303 int run_plugins(int plugin_type, void *data)
5304 {
5305 int (*func)(void *data);
5306
5307 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5308 return PLUGIN_RET_ERROR;
5309
5310 ll_reset(plugins[plugin_type]);
5311 while ((func = ll_next(plugins[plugin_type])))
5312 {
5313 int r = func(data);
5314
5315 if (r != PLUGIN_RET_OK)
5316 return r; // stop here
5317 }
5318
5319 return PLUGIN_RET_OK;
5320 }
5321
5322 static void plugins_done()
5323 {
5324 void *p;
5325
5326 ll_reset(loaded_plugins);
5327 while ((p = ll_next(loaded_plugins)))
5328 run_plugin_done(p);
5329 }
5330
5331 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5332 {
5333 struct nsctl request;
5334 struct nsctl response;
5335 int type = unpack_control(&request, buf, len);
5336 int r;
5337 void *p;
5338
5339 if (log_stream && config->debug >= 4)
5340 {
5341 if (type < 0)
5342 {
5343 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5344 fmtaddr(addr->sin_addr.s_addr, 0), type);
5345 }
5346 else
5347 {
5348 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5349 dump_control(&request, log_stream);
5350 }
5351 }
5352
5353 switch (type)
5354 {
5355 case NSCTL_REQ_LOAD:
5356 if (request.argc != 1)
5357 {
5358 response.type = NSCTL_RES_ERR;
5359 response.argc = 1;
5360 response.argv[0] = "name of plugin required";
5361 }
5362 else if ((r = add_plugin(request.argv[0])) < 1)
5363 {
5364 response.type = NSCTL_RES_ERR;
5365 response.argc = 1;
5366 response.argv[0] = !r
5367 ? "plugin already loaded"
5368 : "error loading plugin";
5369 }
5370 else
5371 {
5372 response.type = NSCTL_RES_OK;
5373 response.argc = 0;
5374 }
5375
5376 break;
5377
5378 case NSCTL_REQ_UNLOAD:
5379 if (request.argc != 1)
5380 {
5381 response.type = NSCTL_RES_ERR;
5382 response.argc = 1;
5383 response.argv[0] = "name of plugin required";
5384 }
5385 else if ((r = remove_plugin(request.argv[0])) < 1)
5386 {
5387 response.type = NSCTL_RES_ERR;
5388 response.argc = 1;
5389 response.argv[0] = !r
5390 ? "plugin not loaded"
5391 : "plugin not found";
5392 }
5393 else
5394 {
5395 response.type = NSCTL_RES_OK;
5396 response.argc = 0;
5397 }
5398
5399 break;
5400
5401 case NSCTL_REQ_HELP:
5402 response.type = NSCTL_RES_OK;
5403 response.argc = 0;
5404
5405 ll_reset(loaded_plugins);
5406 while ((p = ll_next(loaded_plugins)))
5407 {
5408 char **help = dlsym(p, "plugin_control_help");
5409 while (response.argc < 0xff && help && *help)
5410 response.argv[response.argc++] = *help++;
5411 }
5412
5413 break;
5414
5415 case NSCTL_REQ_CONTROL:
5416 {
5417 struct param_control param = {
5418 config->cluster_iam_master,
5419 request.argc,
5420 request.argv,
5421 0,
5422 NULL,
5423 };
5424
5425 int r = run_plugins(PLUGIN_CONTROL, &param);
5426
5427 if (r == PLUGIN_RET_ERROR)
5428 {
5429 response.type = NSCTL_RES_ERR;
5430 response.argc = 1;
5431 response.argv[0] = param.additional
5432 ? param.additional
5433 : "error returned by plugin";
5434 }
5435 else if (r == PLUGIN_RET_NOTMASTER)
5436 {
5437 static char msg[] = "must be run on master: 000.000.000.000";
5438
5439 response.type = NSCTL_RES_ERR;
5440 response.argc = 1;
5441 if (config->cluster_master_address)
5442 {
5443 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5444 response.argv[0] = msg;
5445 }
5446 else
5447 {
5448 response.argv[0] = "must be run on master: none elected";
5449 }
5450 }
5451 else if (!(param.response & NSCTL_RESPONSE))
5452 {
5453 response.type = NSCTL_RES_ERR;
5454 response.argc = 1;
5455 response.argv[0] = param.response
5456 ? "unrecognised response value from plugin"
5457 : "unhandled action";
5458 }
5459 else
5460 {
5461 response.type = param.response;
5462 response.argc = 0;
5463 if (param.additional)
5464 {
5465 response.argc = 1;
5466 response.argv[0] = param.additional;
5467 }
5468 }
5469 }
5470
5471 break;
5472
5473 default:
5474 response.type = NSCTL_RES_ERR;
5475 response.argc = 1;
5476 response.argv[0] = "error unpacking control packet";
5477 }
5478
5479 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5480 if (!buf)
5481 {
5482 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5483 return;
5484 }
5485
5486 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5487 if (r > 0)
5488 {
5489 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5490 if (log_stream && config->debug >= 4)
5491 {
5492 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5493 dump_control(&response, log_stream);
5494 }
5495 }
5496 else
5497 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5498 fmtaddr(addr->sin_addr.s_addr, 0), r);
5499
5500 free(buf);
5501 }
5502
5503 static tunnelidt new_tunnel()
5504 {
5505 tunnelidt i;
5506 for (i = 1; i < MAXTUNNEL; i++)
5507 {
5508 if (tunnel[i].state == TUNNELFREE)
5509 {
5510 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5511 if (i > config->cluster_highest_tunnelid)
5512 config->cluster_highest_tunnelid = i;
5513 return i;
5514 }
5515 }
5516 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5517 return 0;
5518 }
5519
5520 //
5521 // We're becoming the master. Do any required setup..
5522 //
5523 // This is principally telling all the plugins that we're
5524 // now a master, and telling them about all the sessions
5525 // that are active too..
5526 //
5527 void become_master(void)
5528 {
5529 int s, i;
5530 static struct event_data d[RADIUS_FDS];
5531 struct epoll_event e;
5532
5533 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5534
5535 // running a bunch of iptables commands is slow and can cause
5536 // the master to drop tunnels on takeover--kludge around the
5537 // problem by forking for the moment (note: race)
5538 if (!fork_and_close())
5539 {
5540 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5541 {
5542 if (!session[s].opened) // Not an in-use session.
5543 continue;
5544
5545 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5546 }
5547 exit(0);
5548 }
5549
5550 // add radius fds
5551 e.events = EPOLLIN;
5552 for (i = 0; i < RADIUS_FDS; i++)
5553 {
5554 d[i].type = FD_TYPE_RADIUS;
5555 d[i].index = i;
5556 e.data.ptr = &d[i];
5557
5558 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5559 }
5560 }
5561
5562 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5563 {
5564 int s, i;
5565 int count = 0;
5566 int buckets[64];
5567
5568 if (CLI_HELP_REQUESTED)
5569 return CLI_HELP_NO_ARGS;
5570
5571 time(&time_now);
5572 for (i = 0; i < 64;++i) buckets[i] = 0;
5573
5574 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5575 {
5576 int idle;
5577 if (!session[s].opened)
5578 continue;
5579
5580 idle = time_now - session[s].last_data;
5581 idle /= 5 ; // In multiples of 5 seconds.
5582 if (idle < 0)
5583 idle = 0;
5584 if (idle > 63)
5585 idle = 63;
5586
5587 ++count;
5588 ++buckets[idle];
5589 }
5590
5591 for (i = 0; i < 63; ++i)
5592 {
5593 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5594 }
5595 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5596 cli_print(cli, "%d total sessions open.", count);
5597 return CLI_OK;
5598 }
5599
5600 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5601 {
5602 int s, i;
5603 int count = 0;
5604 int buckets[64];
5605
5606 if (CLI_HELP_REQUESTED)
5607 return CLI_HELP_NO_ARGS;
5608
5609 time(&time_now);
5610 for (i = 0; i < 64;++i) buckets[i] = 0;
5611
5612 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5613 {
5614 int open = 0, d;
5615 if (!session[s].opened)
5616 continue;
5617
5618 d = time_now - session[s].opened;
5619 if (d < 0)
5620 d = 0;
5621 while (d > 1 && open < 32)
5622 {
5623 ++open;
5624 d >>= 1; // half.
5625 }
5626 ++count;
5627 ++buckets[open];
5628 }
5629
5630 s = 1;
5631 for (i = 0; i < 30; ++i)
5632 {
5633 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5634 s <<= 1;
5635 }
5636 cli_print(cli, "%d total sessions open.", count);
5637 return CLI_OK;
5638 }
5639
5640 /* Unhide an avp.
5641 *
5642 * This unencodes the AVP using the L2TP secret and the previously
5643 * stored random vector. It overwrites the hidden data with the
5644 * unhidden AVP subformat.
5645 */
5646 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5647 {
5648 MD5_CTX ctx;
5649 uint8_t digest[16];
5650 uint8_t *last;
5651 size_t d = 0;
5652 uint16_t m = htons(type);
5653
5654 // Compute initial pad
5655 MD5_Init(&ctx);
5656 MD5_Update(&ctx, (unsigned char *) &m, 2);
5657 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5658 MD5_Update(&ctx, vector, vec_len);
5659 MD5_Final(digest, &ctx);
5660
5661 // pointer to last decoded 16 octets
5662 last = value;
5663
5664 while (len > 0)
5665 {
5666 // calculate a new pad based on the last decoded block
5667 if (d >= sizeof(digest))
5668 {
5669 MD5_Init(&ctx);
5670 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5671 MD5_Update(&ctx, last, sizeof(digest));
5672 MD5_Final(digest, &ctx);
5673
5674 d = 0;
5675 last = value;
5676 }
5677
5678 *value++ ^= digest[d++];
5679 len--;
5680 }
5681 }
5682
5683 int find_filter(char const *name, size_t len)
5684 {
5685 int free = -1;
5686 int i;
5687
5688 for (i = 0; i < MAXFILTER; i++)
5689 {
5690 if (!*ip_filters[i].name)
5691 {
5692 if (free < 0)
5693 free = i;
5694
5695 continue;
5696 }
5697
5698 if (strlen(ip_filters[i].name) != len)
5699 continue;
5700
5701 if (!strncmp(ip_filters[i].name, name, len))
5702 return i;
5703 }
5704
5705 return free;
5706 }
5707
5708 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5709 {
5710 switch (p->op)
5711 {
5712 case FILTER_PORT_OP_EQ: return port == p->port;
5713 case FILTER_PORT_OP_NEQ: return port != p->port;
5714 case FILTER_PORT_OP_GT: return port > p->port;
5715 case FILTER_PORT_OP_LT: return port < p->port;
5716 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5717 }
5718
5719 return 0;
5720 }
5721
5722 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5723 {
5724 switch (op)
5725 {
5726 case FILTER_FLAG_OP_ANY:
5727 return (flags & sflags) || (~flags & cflags);
5728
5729 case FILTER_FLAG_OP_ALL:
5730 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5731
5732 case FILTER_FLAG_OP_EST:
5733 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5734 }
5735
5736 return 0;
5737 }
5738
5739 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5740 {
5741 uint16_t frag_offset;
5742 uint8_t proto;
5743 in_addr_t src_ip;
5744 in_addr_t dst_ip;
5745 uint16_t src_port = 0;
5746 uint16_t dst_port = 0;
5747 uint8_t flags = 0;
5748 ip_filter_rulet *rule;
5749
5750 if (len < 20) // up to end of destination address
5751 return 0;
5752
5753 if ((*buf >> 4) != 4) // IPv4
5754 return 0;
5755
5756 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5757 proto = buf[9];
5758 src_ip = *(in_addr_t *) (buf + 12);
5759 dst_ip = *(in_addr_t *) (buf + 16);
5760
5761 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5762 {
5763 int l = (buf[0] & 0xf) * 4; // length of IP header
5764 if (len < l + 4) // ports
5765 return 0;
5766
5767 src_port = ntohs(*(uint16_t *) (buf + l));
5768 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5769 if (proto == IPPROTO_TCP)
5770 {
5771 if (len < l + 14) // flags
5772 return 0;
5773
5774 flags = buf[l + 13] & 0x3f;
5775 }
5776 }
5777
5778 for (rule = ip_filters[filter].rules; rule->action; rule++)
5779 {
5780 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5781 continue;
5782
5783 if (rule->src_wild != INADDR_BROADCAST &&
5784 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5785 continue;
5786
5787 if (rule->dst_wild != INADDR_BROADCAST &&
5788 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
5789 continue;
5790
5791 if (frag_offset)
5792 {
5793 // layer 4 deny rules are skipped
5794 if (rule->action == FILTER_ACTION_DENY &&
5795 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
5796 continue;
5797 }
5798 else
5799 {
5800 if (rule->frag)
5801 continue;
5802
5803 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
5804 {
5805 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
5806 continue;
5807
5808 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
5809 continue;
5810
5811 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
5812 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
5813 continue;
5814 }
5815 }
5816
5817 // matched
5818 rule->counter++;
5819 return rule->action == FILTER_ACTION_PERMIT;
5820 }
5821
5822 // default deny
5823 return 0;
5824 }