45962c01df4ca533f9b853f440d615228f024521
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005 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 1.81 2005/02/08 01:20:38 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 /* BGP */
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 snoopfd = -1; // UDP file handle for sending out intercept data
64 int *radfds = NULL; // RADIUS requests file handles
65 int ifrfd = -1; // File descriptor for routing, etc
66 int ifr6fd = -1; // File descriptor for IPv6 routing, etc
67 static int rand_fd = -1; // Random data source
68 time_t basetime = 0; // base clock
69 char hostname[1000] = ""; // us.
70 static int tunidx; // ifr_ifindex of tun device
71 static uint32_t sessionid = 0; // session id for radius accounting
72 static int syslog_log = 0; // are we logging to syslog
73 static FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog).
74 extern int cluster_sockfd; // Intra-cluster communications socket.
75 uint32_t last_id = 0; // Last used PPP SID. Can I kill this?? -- mo
76
77 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
78 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
79
80 static void *ip_hash[256]; // Mapping from IP address to session structures.
81 struct ipv6radix {
82 int sess;
83 struct ipv6radix *branch;
84 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
85
86 // Traffic counters.
87 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
88 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
89 uint32_t eth_tx = 0;
90
91 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
92 time_t time_now = 0; // Current time in seconds since epoch.
93 static char time_now_string[64] = {0}; // Current time as a string.
94 static char main_quit = 0; // True if we're in the process of exiting.
95 linked_list *loaded_plugins;
96 linked_list *plugins[MAX_PLUGIN_TYPES];
97
98 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
99 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
100
101 config_descriptt config_values[] = {
102 CONFIG("debug", debug, INT),
103 CONFIG("log_file", log_filename, STRING),
104 CONFIG("pid_file", pid_file, STRING),
105 CONFIG("random_device", random_device, STRING),
106 CONFIG("l2tp_secret", l2tpsecret, STRING),
107 CONFIG("primary_dns", default_dns1, IPv4),
108 CONFIG("secondary_dns", default_dns2, IPv4),
109 CONFIG("save_state", save_state, BOOL),
110 CONFIG("primary_radius", radiusserver[0], IPv4),
111 CONFIG("secondary_radius", radiusserver[1], IPv4),
112 CONFIG("primary_radius_port", radiusport[0], SHORT),
113 CONFIG("secondary_radius_port", radiusport[1], SHORT),
114 CONFIG("radius_accounting", radius_accounting, BOOL),
115 CONFIG("radius_secret", radiussecret, STRING),
116 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
117 CONFIG("bind_address", bind_address, IPv4),
118 CONFIG("peer_address", peer_address, IPv4),
119 CONFIG("send_garp", send_garp, BOOL),
120 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
121 CONFIG("throttle_buckets", num_tbfs, INT),
122 CONFIG("accounting_dir", accounting_dir, STRING),
123 CONFIG("setuid", target_uid, INT),
124 CONFIG("dump_speed", dump_speed, BOOL),
125 CONFIG("cleanup_interval", cleanup_interval, INT),
126 CONFIG("multi_read_count", multi_read_count, INT),
127 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
128 CONFIG("lock_pages", lock_pages, BOOL),
129 CONFIG("icmp_rate", icmp_rate, INT),
130 CONFIG("packet_limit", max_packets, INT),
131 CONFIG("cluster_address", cluster_address, IPv4),
132 CONFIG("cluster_interface", cluster_interface, STRING),
133 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
134 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
135 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
136 { NULL, 0, 0, 0 },
137 };
138
139 static char *plugin_functions[] = {
140 NULL,
141 "plugin_pre_auth",
142 "plugin_post_auth",
143 "plugin_packet_rx",
144 "plugin_packet_tx",
145 "plugin_timer",
146 "plugin_new_session",
147 "plugin_kill_session",
148 "plugin_control",
149 "plugin_radius_response",
150 "plugin_become_master",
151 "plugin_new_session_master",
152 };
153
154 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
155
156 // Counters for shutdown sessions
157 static sessiont shut_acct[8192];
158 static sessionidt shut_acct_n = 0;
159
160 tunnelt *tunnel = NULL; // Array of tunnel structures.
161 sessiont *session = NULL; // Array of session structures.
162 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
163 radiust *radius = NULL; // Array of radius structures.
164 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
165 ip_filtert *ip_filters = NULL; // Array of named filters.
166 static controlt *controlfree = 0;
167 struct Tstats *_statistics = NULL;
168 #ifdef RINGBUFFER
169 struct Tringbuffer *ringbuffer = NULL;
170 #endif
171
172 static void cache_ipmap(in_addr_t ip, int s);
173 static void uncache_ipmap(in_addr_t ip);
174 static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s);
175 static void free_ip_address(sessionidt s);
176 static void dump_acct_info(int all);
177 static void sighup_handler(int sig);
178 static void sigalrm_handler(int sig);
179 static void sigterm_handler(int sig);
180 static void sigquit_handler(int sig);
181 static void sigchild_handler(int sig);
182 static void read_state(void);
183 static void dump_state(void);
184 static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response);
185 static void update_config(void);
186 static void read_config_file(void);
187 static void initplugins(void);
188 static int add_plugin(char *plugin_name);
189 static int remove_plugin(char *plugin_name);
190 static void plugins_done(void);
191 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
192 static tunnelidt new_tunnel(void);
193 static int unhide_avp(uint8_t *avp, tunnelidt t, sessionidt s, uint16_t length);
194
195 // return internal time (10ths since process startup)
196 static clockt now(void)
197 {
198 struct timeval t;
199 gettimeofday(&t, 0);
200 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
201 }
202
203 // work out a retry time based on try number
204 // This is a straight bounded exponential backoff.
205 // Maximum re-try time is 32 seconds. (2^5).
206 clockt backoff(uint8_t try)
207 {
208 if (try > 5) try = 5; // max backoff
209 return now() + 10 * (1 << try);
210 }
211
212
213 //
214 // Log a debug message. Typically called via the LOG macro
215 //
216 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
217 {
218 static char message[65536] = {0};
219 va_list ap;
220
221 #ifdef RINGBUFFER
222 if (ringbuffer)
223 {
224 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
225 ringbuffer->tail = 0;
226 if (ringbuffer->tail == ringbuffer->head)
227 if (++ringbuffer->head >= RINGBUFFER_SIZE)
228 ringbuffer->head = 0;
229
230 ringbuffer->buffer[ringbuffer->tail].level = level;
231 ringbuffer->buffer[ringbuffer->tail].session = s;
232 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
233 va_start(ap, format);
234 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
235 va_end(ap);
236 }
237 #endif
238
239 if (config->debug < level) return;
240
241 va_start(ap, format);
242 vsnprintf(message, sizeof(message), format, ap);
243
244 if (log_stream)
245 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
246 else if (syslog_log)
247 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
248
249 va_end(ap);
250 }
251
252 void _log_hex(int level, const char *title, const char *data, int maxsize)
253 {
254 int i, j;
255 const uint8_t *d = (const uint8_t *) data;
256
257 if (config->debug < level) return;
258
259 // No support for _log_hex to syslog
260 if (log_stream)
261 {
262 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
263 setvbuf(log_stream, NULL, _IOFBF, 16384);
264
265 for (i = 0; i < maxsize; )
266 {
267 fprintf(log_stream, "%4X: ", i);
268 for (j = i; j < maxsize && j < (i + 16); j++)
269 {
270 fprintf(log_stream, "%02X ", d[j]);
271 if (j == i + 7)
272 fputs(": ", log_stream);
273 }
274
275 for (; j < i + 16; j++)
276 {
277 fputs(" ", log_stream);
278 if (j == i + 7)
279 fputs(": ", log_stream);
280 }
281
282 fputs(" ", log_stream);
283 for (j = i; j < maxsize && j < (i + 16); j++)
284 {
285 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
286 fputc(d[j], log_stream);
287 else
288 fputc('.', log_stream);
289
290 if (j == i + 7)
291 fputs(" ", log_stream);
292 }
293
294 i = j;
295 fputs("\n", log_stream);
296 }
297
298 fflush(log_stream);
299 setbuf(log_stream, NULL);
300 }
301 }
302
303 // initialise the random generator
304 static void initrandom(char *source)
305 {
306 static char path[sizeof(config->random_device)] = "*undefined*";
307
308 // reinitialise only if we are forced to do so or if the config has changed
309 if (source && !strncmp(path, source, sizeof(path)))
310 return;
311
312 // close previous source, if any
313 if (rand_fd >= 0) close(rand_fd);
314
315 rand_fd = -1;
316
317 if (source)
318 {
319 // register changes
320 snprintf(path, sizeof(path), "%s", source);
321
322 if (*path == '/')
323 {
324 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
325 if (rand_fd < 0)
326 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
327 path, strerror(errno));
328 }
329 }
330
331 // no source: seed prng
332 {
333 unsigned seed = time_now ^ getpid();
334 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
335 srand(seed);
336 }
337 }
338
339 // fill buffer with random data
340 void random_data(uint8_t *buf, int len)
341 {
342 int n = 0;
343
344 CSTAT(random_data);
345 if (rand_fd >= 0)
346 {
347 n = read(rand_fd, buf, len);
348 if (n >= len) return;
349 if (n < 0)
350 {
351 if (errno != EAGAIN)
352 {
353 LOG(0, 0, 0, "Error reading from random source: %s\n",
354 strerror(errno));
355
356 // fall back to rand()
357 initrandom(0);
358 }
359
360 n = 0;
361 }
362 }
363
364 // append missing data
365 while (n < len)
366 // not using the low order bits from the prng stream
367 buf[n++] = (rand() >> 4) & 0xff;
368 }
369
370 // Add a route
371 //
372 // This adds it to the routing table, advertises it
373 // via BGP if enabled, and stuffs it into the
374 // 'sessionbyip' cache.
375 //
376 // 'ip' and 'mask' must be in _host_ order.
377 //
378 static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
379 {
380 struct rtentry r;
381 int i;
382
383 if (!mask) mask = 0xffffffff;
384
385 ip &= mask; // Force the ip to be the first one in the route.
386
387 memset(&r, 0, sizeof(r));
388 r.rt_dev = config->tundevice;
389 r.rt_dst.sa_family = AF_INET;
390 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
391 r.rt_gateway.sa_family = AF_INET;
392 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
393 r.rt_genmask.sa_family = AF_INET;
394 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
395 r.rt_flags = (RTF_UP | RTF_STATIC);
396 if (gw)
397 r.rt_flags |= RTF_GATEWAY;
398 else if (mask == 0xffffffff)
399 r.rt_flags |= RTF_HOST;
400
401 LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
402 fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
403 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
404
405 if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
406 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
407
408 #ifdef BGP
409 if (add)
410 bgp_add_route(htonl(ip), htonl(mask));
411 else
412 bgp_del_route(htonl(ip), htonl(mask));
413 #endif /* BGP */
414
415 // Add/Remove the IPs to the 'sessionbyip' cache.
416 // Note that we add the zero address in the case of
417 // a network route. Roll on CIDR.
418
419 // Note that 's == 0' implies this is the address pool.
420 // We still cache it here, because it will pre-fill
421 // the malloc'ed tree.
422
423 if (s)
424 {
425 if (!add) // Are we deleting a route?
426 s = 0; // Caching the session as '0' is the same as uncaching.
427
428 for (i = ip; (i&mask) == (ip&mask) ; ++i)
429 cache_ipmap(i, s);
430 }
431 }
432
433 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
434 {
435 struct in6_rtmsg rt;
436 char ipv6addr[INET6_ADDRSTRLEN];
437
438 if (ifr6fd < 0)
439 {
440 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
441 return;
442 }
443
444 memset(&rt, 0, sizeof(rt));
445
446 memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
447 rt.rtmsg_dst_len = prefixlen;
448 rt.rtmsg_metric = 1;
449 rt.rtmsg_flags = RTF_UP;
450 rt.rtmsg_ifindex = tunidx;
451
452 LOG(1, 0, 0, "Route %s %s/%d\n",
453 add ? "add" : "del",
454 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
455 prefixlen);
456
457 if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
458 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
459 strerror(errno));
460
461 // FIXME: need to add BGP routing (RFC2858)
462
463 if (s)
464 {
465 if (!add) // Are we deleting a route?
466 s = 0; // Caching the session as '0' is the same as uncaching.
467
468 cache_ipv6map(ip, prefixlen, s);
469 }
470
471 return;
472 }
473
474 // defined in linux/ipv6.h, but tricky to include from user-space
475 // TODO: move routing to use netlink rather than ioctl
476 struct in6_ifreq {
477 struct in6_addr ifr6_addr;
478 __u32 ifr6_prefixlen;
479 unsigned int ifr6_ifindex;
480 };
481
482 //
483 // Set up TUN interface
484 static void inittun(void)
485 {
486 struct ifreq ifr;
487 struct in6_ifreq ifr6;
488 struct sockaddr_in sin = {0};
489 memset(&ifr, 0, sizeof(ifr));
490 ifr.ifr_flags = IFF_TUN;
491
492 tunfd = open(TUNDEVICE, O_RDWR);
493 if (tunfd < 0)
494 { // fatal
495 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
496 exit(1);
497 }
498 {
499 int flags = fcntl(tunfd, F_GETFL, 0);
500 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
501 }
502 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
503 {
504 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
505 exit(1);
506 }
507 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
508 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
509 ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
510
511 sin.sin_family = AF_INET;
512 sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
513 memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
514
515 if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
516 {
517 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
518 exit(1);
519 }
520 /* Bump up the qlen to deal with bursts from the network */
521 ifr.ifr_qlen = 1000;
522 if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
523 {
524 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
525 exit(1);
526 }
527 ifr.ifr_flags = IFF_UP;
528 if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
529 {
530 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
531 exit(1);
532 }
533 if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
534 {
535 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
536 exit(1);
537 }
538 tunidx = ifr.ifr_ifindex;
539
540 // Only setup IPv6 on the tun device if we have a configured prefix
541 if (config->ipv6_prefix.s6_addr[0] > 0) {
542 ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
543
544 // Link local address is FE80::1
545 memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
546 ifr6.ifr6_addr.s6_addr[0] = 0xFE;
547 ifr6.ifr6_addr.s6_addr[1] = 0x80;
548 ifr6.ifr6_addr.s6_addr[15] = 1;
549 ifr6.ifr6_prefixlen = 64;
550 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
551 if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
552 {
553 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
554 " %s\n", strerror(errno));
555 }
556
557 // Global address is prefix::1
558 memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
559 ifr6.ifr6_addr = config->ipv6_prefix;
560 ifr6.ifr6_addr.s6_addr[15] = 1;
561 ifr6.ifr6_prefixlen = 64;
562 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
563 if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
564 {
565 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
566 strerror(errno));
567 }
568 }
569 }
570
571 // set up UDP port
572 static void initudp(void)
573 {
574 int on = 1;
575 struct sockaddr_in addr;
576
577 // Tunnel
578 memset(&addr, 0, sizeof(addr));
579 addr.sin_family = AF_INET;
580 addr.sin_port = htons(L2TPPORT);
581 addr.sin_addr.s_addr = config->bind_address;
582 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
583 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
584 {
585 int flags = fcntl(udpfd, F_GETFL, 0);
586 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
587 }
588 if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
589 {
590 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
591 exit(1);
592 }
593 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
594
595 // Control
596 memset(&addr, 0, sizeof(addr));
597 addr.sin_family = AF_INET;
598 addr.sin_port = htons(NSCTL_PORT);
599 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
600 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
601 if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
602 {
603 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
604 exit(1);
605 }
606 }
607
608 //
609 // Find session by IP, < 1 for not found
610 //
611 // Confusingly enough, this 'ip' must be
612 // in _network_ order. This being the common
613 // case when looking it up from IP packet headers.
614 //
615 // We actually use this cache for two things.
616 // #1. For used IP addresses, this maps to the
617 // session ID that it's used by.
618 // #2. For un-used IP addresses, this maps to the
619 // index into the pool table that contains that
620 // IP address.
621 //
622
623 static int lookup_ipmap(in_addr_t ip)
624 {
625 uint8_t *a = (uint8_t *) &ip;
626 uint8_t **d = (uint8_t **) ip_hash;
627
628 if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
629 if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
630 if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
631
632 return (int) (intptr_t) d[(size_t) *a];
633 }
634
635 static int lookup_ipv6map(struct in6_addr ip)
636 {
637 struct ipv6radix *curnode;
638 int i;
639 int s;
640 char ipv6addr[INET6_ADDRSTRLEN];
641
642 curnode = &ipv6_hash[ip.s6_addr[0]];
643 i = 1;
644 s = curnode->sess;
645
646 while (s == 0 && i < 15 && curnode->branch != NULL)
647 {
648 curnode = &curnode->branch[ip.s6_addr[i]];
649 s = curnode->sess;
650 i++;
651 }
652
653 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
654 inet_ntop(AF_INET6, &ip, ipv6addr,
655 INET6_ADDRSTRLEN),
656 s);
657
658 return s;
659 }
660
661 sessionidt sessionbyip(in_addr_t ip)
662 {
663 int s = lookup_ipmap(ip);
664 CSTAT(sessionbyip);
665
666 if (s > 0 && s < MAXSESSION && session[s].tunnel)
667 return (sessionidt) s;
668
669 return 0;
670 }
671
672 sessionidt sessionbyipv6(struct in6_addr ip)
673 {
674 int s;
675 CSTAT(sessionbyipv6);
676
677 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
678 (ip.s6_addr[0] == 0xFE && ip.s6_addr[1] == 0x80 &&
679 (ip.s6_addr16[1] == ip.s6_addr16[2] == ip.s6_addr16[3] == 0))) {
680 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
681 } else {
682 s = lookup_ipv6map(ip);
683 }
684
685 if (s > 0 && s < MAXSESSION && session[s].tunnel)
686 return s;
687
688 return 0;
689 }
690
691 //
692 // Take an IP address in HOST byte order and
693 // add it to the sessionid by IP cache.
694 //
695 // (It's actually cached in network order)
696 //
697 static void cache_ipmap(in_addr_t ip, int s)
698 {
699 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
700 uint8_t *a = (uint8_t *) &nip;
701 uint8_t **d = (uint8_t **) ip_hash;
702 int i;
703
704 for (i = 0; i < 3; i++)
705 {
706 if (!d[(size_t) a[i]])
707 {
708 if (!(d[(size_t) a[i]] = calloc(256, sizeof(void *))))
709 return;
710 }
711
712 d = (uint8_t **) d[(size_t) a[i]];
713 }
714
715 d[(size_t) a[3]] = (uint8_t *) (intptr_t) s;
716
717 if (s > 0)
718 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
719
720 else if (s == 0)
721 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
722 // else a map to an ip pool index.
723 }
724
725 static void uncache_ipmap(in_addr_t ip)
726 {
727 cache_ipmap(ip, 0); // Assign it to the NULL session.
728 }
729
730 static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s)
731 {
732 int i;
733 int bytes;
734 struct ipv6radix *curnode;
735 char ipv6addr[INET6_ADDRSTRLEN];
736
737 curnode = &ipv6_hash[ip.s6_addr[0]];
738
739 bytes = prefixlen >> 3;
740 i = 1;
741 while (i < bytes) {
742 if (curnode->branch == NULL)
743 {
744 if (!(curnode->branch = calloc(256,
745 sizeof (struct ipv6radix))))
746 return;
747 }
748 curnode = &curnode->branch[ip.s6_addr[i]];
749 i++;
750 }
751
752 curnode->sess = s;
753
754 if (s > 0)
755 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
756 inet_ntop(AF_INET6, &ip, ipv6addr,
757 INET6_ADDRSTRLEN),
758 prefixlen);
759 else if (s == 0)
760 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
761 inet_ntop(AF_INET6, &ip, ipv6addr,
762 INET6_ADDRSTRLEN),
763 prefixlen);
764 }
765
766 //
767 // CLI list to dump current ipcache.
768 //
769 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
770 {
771 char **d = (char **) ip_hash, **e, **f, **g;
772 int i, j, k, l;
773 int count = 0;
774
775 if (CLI_HELP_REQUESTED)
776 return CLI_HELP_NO_ARGS;
777
778 cli_print(cli, "%7s %s", "Sess#", "IP Address");
779
780 for (i = 0; i < 256; ++i)
781 {
782 if (!d[i])
783 continue;
784 e = (char **) d[i];
785 for (j = 0; j < 256; ++j)
786 {
787 if (!e[j])
788 continue;
789 f = (char **) e[j];
790 for (k = 0; k < 256; ++k)
791 {
792 if (!f[k])
793 continue;
794 g = (char **)f[k];
795 for (l = 0; l < 256; ++l)
796 {
797 if (!g[l])
798 continue;
799 cli_print(cli, "%7d %d.%d.%d.%d", (int) (intptr_t) g[l], i, j, k, l);
800 ++count;
801 }
802 }
803 }
804 }
805 cli_print(cli, "%d entries in cache", count);
806 return CLI_OK;
807 }
808
809
810 // Find session by username, 0 for not found
811 // walled garden users aren't authenticated, so the username is
812 // reasonably useless. Ignore them to avoid incorrect actions
813 //
814 // This is VERY inefficent. Don't call it often. :)
815 //
816 sessionidt sessionbyuser(char *username)
817 {
818 int s;
819 CSTAT(sessionbyuser);
820
821 for (s = 1; s < MAXSESSION ; ++s)
822 {
823 if (session[s].walled_garden)
824 continue; // Skip walled garden users.
825
826 if (!strncmp(session[s].user, username, 128))
827 return s;
828
829 }
830 return 0; // Not found.
831 }
832
833 void send_garp(in_addr_t ip)
834 {
835 int s;
836 struct ifreq ifr;
837 uint8_t mac[6];
838
839 s = socket(PF_INET, SOCK_DGRAM, 0);
840 if (s < 0)
841 {
842 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
843 return;
844 }
845 memset(&ifr, 0, sizeof(ifr));
846 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
847 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
848 {
849 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
850 close(s);
851 return;
852 }
853 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
854 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
855 {
856 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
857 close(s);
858 return;
859 }
860 close(s);
861 sendarp(ifr.ifr_ifindex, mac, ip);
862 }
863
864 // Find session by username, 0 for not found
865 static sessiont *sessiontbysessionidt(sessionidt s)
866 {
867 if (!s || s > MAXSESSION) return NULL;
868 return &session[s];
869 }
870
871 static sessionidt sessionidtbysessiont(sessiont *s)
872 {
873 sessionidt val = s-session;
874 if (s < session || val > MAXSESSION) return 0;
875 return val;
876 }
877
878 // actually send a control message for a specific tunnel
879 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
880 {
881 struct sockaddr_in addr;
882
883 CSTAT(tunnelsend);
884
885 if (!t)
886 {
887 static int backtrace_count = 0;
888 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
889 STAT(tunnel_tx_errors);
890 log_backtrace(backtrace_count, 5)
891 return;
892 }
893
894 if (!tunnel[t].ip)
895 {
896 static int backtrace_count = 0;
897 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
898 log_backtrace(backtrace_count, 5)
899 STAT(tunnel_tx_errors);
900 return;
901 }
902
903 memset(&addr, 0, sizeof(addr));
904 addr.sin_family = AF_INET;
905 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
906 addr.sin_port = htons(tunnel[t].port);
907
908 // sequence expected, if sequence in message
909 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
910
911 // If this is a control message, deal with retries
912 if (*buf & 0x80)
913 {
914 tunnel[t].last = time_now; // control message sent
915 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
916 if (tunnel[t].try > 1)
917 {
918 STAT(tunnel_retries);
919 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
920 }
921 }
922
923 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
924 {
925 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
926 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
927 STAT(tunnel_tx_errors);
928 return;
929 }
930
931 LOG_HEX(5, "Send Tunnel Data", buf, l);
932 STAT(tunnel_tx_packets);
933 INC_STAT(tunnel_tx_bytes, l);
934 }
935
936 //
937 // Tiny helper function to write data to
938 // the 'tun' device.
939 //
940 int tun_write(uint8_t * data, int size)
941 {
942 return write(tunfd, data, size);
943 }
944
945 // process outgoing (to tunnel) IP
946 //
947 static void processipout(uint8_t * buf, int len)
948 {
949 sessionidt s;
950 sessiont *sp;
951 tunnelidt t;
952 in_addr_t ip;
953
954 char *data = buf; // Keep a copy of the originals.
955 int size = len;
956
957 uint8_t b[MAXETHER + 20];
958
959 CSTAT(processipout);
960
961 if (len < MIN_IP_SIZE)
962 {
963 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
964 STAT(tun_rx_errors);
965 return;
966 }
967 if (len >= MAXETHER)
968 {
969 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
970 STAT(tun_rx_errors);
971 return;
972 }
973
974 // Skip the tun header
975 buf += 4;
976 len -= 4;
977
978 // Got an IP header now
979 if (*(uint8_t *)(buf) >> 4 != 4)
980 {
981 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
982 return;
983 }
984
985 ip = *(uint32_t *)(buf + 16);
986 if (!(s = sessionbyip(ip)))
987 {
988 // Is this a packet for a session that doesn't exist?
989 static int rate = 0; // Number of ICMP packets we've sent this second.
990 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
991
992 if (last != time_now)
993 {
994 last = time_now;
995 rate = 0;
996 }
997
998 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
999 {
1000 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1001 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4), ip, buf, (len < 64) ? 64 : len);
1002 }
1003 return;
1004 }
1005 t = session[s].tunnel;
1006 sp = &session[s];
1007
1008 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1009 if (config->max_packets > 0)
1010 {
1011 if (sess_local[s].last_packet_out == TIME)
1012 {
1013 int max = config->max_packets;
1014
1015 // All packets for throttled sessions are handled by the
1016 // master, so further limit by using the throttle rate.
1017 // A bit of a kludge, since throttle rate is in kbps,
1018 // but should still be generous given our average DSL
1019 // packet size is 200 bytes: a limit of 28kbps equates
1020 // to around 180 packets per second.
1021 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1022 max = sp->throttle_out;
1023
1024 if (++sess_local[s].packets_out > max)
1025 {
1026 sess_local[s].packets_dropped++;
1027 return;
1028 }
1029 }
1030 else
1031 {
1032 if (sess_local[s].packets_dropped)
1033 {
1034 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1035 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1036 sess_local[s].packets_dropped, sess_local[s].packets_out,
1037 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1038 sp->user);
1039 }
1040
1041 sess_local[s].last_packet_out = TIME;
1042 sess_local[s].packets_out = 1;
1043 sess_local[s].packets_dropped = 0;
1044 }
1045 }
1046
1047 // run access-list if any
1048 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1049 return;
1050
1051 if (sp->tbf_out)
1052 {
1053 // Are we throttling this session?
1054 if (config->cluster_iam_master)
1055 tbf_queue_packet(sp->tbf_out, data, size);
1056 else
1057 master_throttle_packet(sp->tbf_out, data, size);
1058 return;
1059 }
1060 else if (sp->walled_garden && !config->cluster_iam_master)
1061 {
1062 // We are walled-gardening this
1063 master_garden_packet(s, data, size);
1064 return;
1065 }
1066
1067 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1068
1069 // Add on L2TP header
1070 {
1071 uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
1072 if (!p) return;
1073 tunnelsend(b, len + (p-b), t); // send it...
1074 }
1075
1076 // Snooping this session, send it to intercept box
1077 if (sp->snoop_ip && sp->snoop_port)
1078 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1079
1080 sp->cout += len; // byte count
1081 sp->total_cout += len; // byte count
1082 sp->pout++;
1083 udp_tx += len;
1084 sess_local[s].cout += len; // To send to master..
1085 }
1086
1087 // process outgoing (to tunnel) IPv6
1088 //
1089 static void processipv6out(uint8_t * buf, int len)
1090 {
1091 sessionidt s;
1092 sessiont *sp;
1093 tunnelidt t;
1094 in_addr_t ip;
1095 struct in6_addr ip6;
1096
1097 char *data = buf; // Keep a copy of the originals.
1098 int size = len;
1099
1100 uint8_t b[MAXETHER + 20];
1101
1102 CSTAT(processipv6out);
1103
1104 if (len < MIN_IP_SIZE)
1105 {
1106 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1107 STAT(tunnel_tx_errors);
1108 return;
1109 }
1110 if (len >= MAXETHER)
1111 {
1112 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1113 STAT(tunnel_tx_errors);
1114 return;
1115 }
1116
1117 // Skip the tun header
1118 buf += 4;
1119 len -= 4;
1120
1121 // Got an IP header now
1122 if (*(uint8_t *)(buf) >> 4 != 6)
1123 {
1124 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1125 return;
1126 }
1127
1128 ip6 = *(struct in6_addr *)(buf+24);
1129 s = sessionbyipv6(ip6);
1130
1131 if (s == 0)
1132 {
1133 ip = *(uint32_t *)(buf + 32);
1134 s = sessionbyip(ip);
1135 }
1136
1137 if (s == 0)
1138 {
1139 // Is this a packet for a session that doesn't exist?
1140 static int rate = 0; // Number of ICMP packets we've sent this second.
1141 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1142
1143 if (last != time_now)
1144 {
1145 last = time_now;
1146 rate = 0;
1147 }
1148
1149 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1150 {
1151 // FIXME: Should send icmp6 host unreachable
1152 }
1153 return;
1154 }
1155 t = session[s].tunnel;
1156 sp = &session[s];
1157
1158 // FIXME: add DoS prevention/filters?
1159
1160 if (sp->tbf_out)
1161 {
1162 // Are we throttling this session?
1163 if (config->cluster_iam_master)
1164 tbf_queue_packet(sp->tbf_out, data, size);
1165 else
1166 master_throttle_packet(sp->tbf_out, data, size);
1167 return;
1168 }
1169 else if (sp->walled_garden && !config->cluster_iam_master)
1170 {
1171 // We are walled-gardening this
1172 master_garden_packet(s, data, size);
1173 return;
1174 }
1175
1176 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1177
1178 // Add on L2TP header
1179 {
1180 uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIPV6);
1181 if (!p) return;
1182 tunnelsend(b, len + (p-b), t); // send it...
1183 }
1184
1185 // Snooping this session, send it to intercept box
1186 if (sp->snoop_ip && sp->snoop_port)
1187 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1188
1189 sp->cout += len; // byte count
1190 sp->total_cout += len; // byte count
1191 sp->pout++;
1192 udp_tx += len;
1193 sess_local[s].cout += len; // To send to master..
1194 }
1195
1196 //
1197 // Helper routine for the TBF filters.
1198 // Used to send queued data in to the user!
1199 //
1200 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1201 {
1202 sessiont *sp;
1203 tunnelidt t;
1204 in_addr_t ip;
1205
1206 uint8_t b[MAXETHER + 20];
1207
1208 if (len < 0 || len > MAXETHER)
1209 {
1210 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1211 return;
1212 }
1213
1214 // Skip the tun header
1215 buf += 4;
1216 len -= 4;
1217
1218 ip = *(in_addr_t *)(buf + 16);
1219
1220 if (!session[s].ip)
1221 return;
1222
1223 t = session[s].tunnel;
1224 sp = &session[s];
1225
1226 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1227
1228 // Add on L2TP header
1229 {
1230 uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
1231 if (!p) return;
1232 tunnelsend(b, len + (p-b), t); // send it...
1233 }
1234
1235 // Snooping this session.
1236 if (sp->snoop_ip && sp->snoop_port)
1237 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1238
1239 sp->cout += len; // byte count
1240 sp->total_cout += len; // byte count
1241 sp->pout++;
1242 udp_tx += len;
1243 sess_local[s].cout += len; // To send to master..
1244 }
1245
1246 // add an AVP (16 bit)
1247 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1248 {
1249 uint16_t l = (m ? 0x8008 : 0x0008);
1250 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1251 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1252 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1253 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1254 c->length += 8;
1255 }
1256
1257 // add an AVP (32 bit)
1258 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1259 {
1260 uint16_t l = (m ? 0x800A : 0x000A);
1261 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1262 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1263 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1264 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1265 c->length += 10;
1266 }
1267
1268 // add an AVP (32 bit)
1269 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1270 {
1271 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1272 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1273 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1274 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1275 memcpy(c->buf + c->length + 6, val, strlen(val));
1276 c->length += 6 + strlen(val);
1277 }
1278
1279 // add a binary AVP
1280 static void controlb(controlt * c, uint16_t avp, char *val, unsigned int len, uint8_t m)
1281 {
1282 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1283 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1284 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1285 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1286 memcpy(c->buf + c->length + 6, val, len);
1287 c->length += 6 + len;
1288 }
1289
1290 // new control connection
1291 static controlt *controlnew(uint16_t mtype)
1292 {
1293 controlt *c;
1294 if (!controlfree)
1295 c = malloc(sizeof(controlt));
1296 else
1297 {
1298 c = controlfree;
1299 controlfree = c->next;
1300 }
1301 assert(c);
1302 c->next = 0;
1303 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1304 c->length = 12;
1305 control16(c, 0, mtype, 1);
1306 return c;
1307 }
1308
1309 // send zero block if nothing is waiting
1310 // (ZLB send).
1311 static void controlnull(tunnelidt t)
1312 {
1313 uint8_t buf[12];
1314 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1315 return;
1316
1317 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1318 *(uint16_t *) (buf + 2) = htons(12); // length
1319 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1320 *(uint16_t *) (buf + 6) = htons(0); // session
1321 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1322 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1323 tunnelsend(buf, 12, t);
1324 }
1325
1326 // add a control message to a tunnel, and send if within window
1327 static void controladd(controlt * c, tunnelidt t, sessionidt s)
1328 {
1329 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1330 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1331 *(uint16_t *) (c->buf + 6) = htons(s ? session[s].far : 0); // session
1332 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1333 tunnel[t].ns++; // advance sequence
1334 // link in message in to queue
1335 if (tunnel[t].controlc)
1336 tunnel[t].controle->next = c;
1337 else
1338 tunnel[t].controls = c;
1339
1340 tunnel[t].controle = c;
1341 tunnel[t].controlc++;
1342
1343 // send now if space in window
1344 if (tunnel[t].controlc <= tunnel[t].window)
1345 {
1346 tunnel[t].try = 0; // first send
1347 tunnelsend(c->buf, c->length, t);
1348 }
1349 }
1350
1351 //
1352 // Throttle or Unthrottle a session
1353 //
1354 // Throttle the data from/to through a session to no more than
1355 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1356 // user).
1357 //
1358 // If either value is -1, the current value is retained for that
1359 // direction.
1360 //
1361 void throttle_session(sessionidt s, int rate_in, int rate_out)
1362 {
1363 if (!session[s].tunnel)
1364 return; // No-one home.
1365
1366 if (!*session[s].user)
1367 return; // User not logged in
1368
1369 if (rate_in >= 0)
1370 {
1371 int bytes = rate_in * 1024 / 8; // kbits to bytes
1372 if (session[s].tbf_in)
1373 free_tbf(session[s].tbf_in);
1374
1375 if (rate_in > 0)
1376 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1377 else
1378 session[s].tbf_in = 0;
1379
1380 session[s].throttle_in = rate_in;
1381 }
1382
1383 if (rate_out >= 0)
1384 {
1385 int bytes = rate_out * 1024 / 8;
1386 if (session[s].tbf_out)
1387 free_tbf(session[s].tbf_out);
1388
1389 if (rate_out > 0)
1390 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1391 else
1392 session[s].tbf_out = 0;
1393
1394 session[s].throttle_out = rate_out;
1395 }
1396 }
1397
1398 // add/remove filters from session (-1 = no change)
1399 static void filter_session(sessionidt s, int filter_in, int filter_out)
1400 {
1401 if (!session[s].tunnel)
1402 return; // No-one home.
1403
1404 if (!*session[s].user)
1405 return; // User not logged in
1406
1407 // paranoia
1408 if (filter_in > MAXFILTER) filter_in = -1;
1409 if (filter_out > MAXFILTER) filter_out = -1;
1410 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1411 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1412
1413 if (filter_in >= 0)
1414 {
1415 if (session[s].filter_in)
1416 ip_filters[session[s].filter_in - 1].used--;
1417
1418 if (filter_in > 0)
1419 ip_filters[filter_in - 1].used++;
1420
1421 session[s].filter_in = filter_in;
1422 }
1423
1424 if (filter_out >= 0)
1425 {
1426 if (session[s].filter_out)
1427 ip_filters[session[s].filter_out - 1].used--;
1428
1429 if (filter_out > 0)
1430 ip_filters[filter_out - 1].used++;
1431
1432 session[s].filter_out = filter_out;
1433 }
1434 }
1435
1436 // start tidy shutdown of session
1437 void sessionshutdown(sessionidt s, char *reason)
1438 {
1439 int walled_garden = session[s].walled_garden;
1440
1441
1442 CSTAT(sessionshutdown);
1443
1444 if (!session[s].tunnel)
1445 {
1446 LOG(3, s, session[s].tunnel, "Called sessionshutdown on a session with no tunnel.\n");
1447 return; // not a live session
1448 }
1449
1450 if (!session[s].die)
1451 {
1452 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1453 LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
1454 run_plugins(PLUGIN_KILL_SESSION, &data);
1455 }
1456
1457 if (session[s].opened && !walled_garden && !session[s].die)
1458 {
1459 // RADIUS Stop message
1460 uint16_t r = session[s].radius;
1461 if (!r)
1462 {
1463 if (!(r = radiusnew(s)))
1464 {
1465 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1466 STAT(radius_overflow);
1467 }
1468 else
1469 {
1470 random_data(radius[r].auth, sizeof(radius[r].auth));
1471 }
1472 }
1473
1474 if (r && radius[r].state != RADIUSSTOP)
1475 radiussend(r, RADIUSSTOP); // stop, if not already trying
1476
1477 // Save counters to dump to accounting file
1478 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1479 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1480 }
1481
1482 if (session[s].ip)
1483 { // IP allocated, clear and unroute
1484 int r;
1485 int routed = 0;
1486 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1487 {
1488 if ((session[s].ip & session[s].route[r].mask) ==
1489 (session[s].route[r].ip & session[s].route[r].mask))
1490 routed++;
1491
1492 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
1493 session[s].route[r].ip = 0;
1494 }
1495
1496 if (session[s].ip_pool_index == -1) // static ip
1497 {
1498 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
1499 session[s].ip = 0;
1500 }
1501 else
1502 free_ip_address(s);
1503
1504 // unroute IPv6, if setup
1505 if (session[s].flags & SF_IPV6_ROUTED)
1506 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1507 }
1508
1509 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
1510 throttle_session(s, 0, 0);
1511
1512 { // Send CDN
1513 controlt *c = controlnew(14); // sending CDN
1514 control16(c, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message
1515 control16(c, 14, s, 1); // assigned session (our end)
1516 controladd(c, session[s].tunnel, s); // send the message
1517 }
1518
1519 if (!session[s].die)
1520 session[s].die = now() + 150; // Clean up in 15 seconds
1521
1522 // update filter refcounts
1523 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
1524 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
1525
1526 cluster_send_session(s);
1527 }
1528
1529 void sendipcp(tunnelidt t, sessionidt s)
1530 {
1531 uint8_t buf[MAXCONTROL];
1532 uint16_t r = session[s].radius;
1533 uint8_t *q;
1534
1535 CSTAT(sendipcp);
1536
1537 if (!r)
1538 r = radiusnew(s);
1539
1540 if (radius[r].state != RADIUSIPCP)
1541 {
1542 radius[r].state = RADIUSIPCP;
1543 radius[r].try = 0;
1544 }
1545
1546 radius[r].retry = backoff(radius[r].try++);
1547 if (radius[r].try > 10)
1548 {
1549 radiusclear(r, s); // Clear radius session.
1550 sessionshutdown(s, "No reply on IPCP");
1551 return;
1552 }
1553
1554 q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
1555 if (!q) return;
1556
1557 *q = ConfigReq;
1558 q[1] = r << RADIUS_SHIFT; // ID, dont care, we only send one type of request
1559 *(uint16_t *) (q + 2) = htons(10);
1560 q[4] = 3;
1561 q[5] = 6;
1562 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
1563 config->bind_address ? config->bind_address :
1564 my_address; // send my IP
1565
1566 tunnelsend(buf, 10 + (q - buf), t); // send it
1567 session[s].flags &= ~SF_IPCP_ACKED; // Clear flag.
1568
1569 // If we have an IPv6 prefix length configured, assume we should
1570 // try to negotiate an IPv6 session as well. Unless we've had a
1571 // (N)ACK for IPV6CP.
1572 if (config->ipv6_prefix.s6_addr[0] > 0 &&
1573 !(session[s].flags & SF_IPV6CP_ACKED) &&
1574 !(session[s].flags & SF_IPV6_NACKED))
1575 {
1576 q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPV6CP);
1577 if (!q) return;
1578
1579 *q = ConfigReq;
1580 q[1] = r << RADIUS_SHIFT; // ID, don't care, we
1581 // only send one type
1582 // of request
1583 *(uint16_t *) (q + 2) = htons(14);
1584 q[4] = 1;
1585 q[5] = 10;
1586 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
1587 *(uint32_t *) (q + 10) = 0;
1588 q[13] = 1;
1589
1590 tunnelsend(buf, 14 + (q - buf), t); // send it
1591 }
1592 }
1593
1594 // kill a session now
1595 static void sessionkill(sessionidt s, char *reason)
1596 {
1597
1598 CSTAT(sessionkill);
1599
1600 session[s].die = now();
1601 sessionshutdown(s, reason); // close radius/routes, etc.
1602 if (session[s].radius)
1603 radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed
1604
1605 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
1606
1607 memset(&session[s], 0, sizeof(session[s]));
1608 session[s].tunnel = T_FREE; // Mark it as free.
1609 session[s].next = sessionfree;
1610 sessionfree = s;
1611 cli_session_actions[s].action = 0;
1612 cluster_send_session(s);
1613 }
1614
1615 static void tunnelclear(tunnelidt t)
1616 {
1617 if (!t) return;
1618 memset(&tunnel[t], 0, sizeof(tunnel[t]));
1619 tunnel[t].state = TUNNELFREE;
1620 }
1621
1622 // kill a tunnel now
1623 static void tunnelkill(tunnelidt t, char *reason)
1624 {
1625 sessionidt s;
1626 controlt *c;
1627
1628 CSTAT(tunnelkill);
1629
1630 tunnel[t].state = TUNNELDIE;
1631
1632 // free control messages
1633 while ((c = tunnel[t].controls))
1634 {
1635 controlt * n = c->next;
1636 tunnel[t].controls = n;
1637 tunnel[t].controlc--;
1638 c->next = controlfree;
1639 controlfree = c;
1640 }
1641 // kill sessions
1642 for (s = 1; s < MAXSESSION; s++)
1643 if (session[s].tunnel == t)
1644 sessionkill(s, reason);
1645
1646 // free tunnel
1647 tunnelclear(t);
1648 LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason);
1649 cli_tunnel_actions[s].action = 0;
1650 cluster_send_tunnel(t);
1651 }
1652
1653 // shut down a tunnel cleanly
1654 static void tunnelshutdown(tunnelidt t, char *reason)
1655 {
1656 sessionidt s;
1657
1658 CSTAT(tunnelshutdown);
1659
1660 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
1661 {
1662 // never set up, can immediately kill
1663 tunnelkill(t, reason);
1664 return;
1665 }
1666 LOG(1, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
1667
1668 // close session
1669 for (s = 1; s < MAXSESSION; s++)
1670 if (session[s].tunnel == t)
1671 sessionshutdown(s, reason);
1672
1673 tunnel[t].state = TUNNELDIE;
1674 tunnel[t].die = now() + 700; // Clean up in 70 seconds
1675 cluster_send_tunnel(t);
1676 // TBA - should we wait for sessions to stop?
1677 { // Send StopCCN
1678 controlt *c = controlnew(4); // sending StopCCN
1679 control16(c, 1, 1, 1); // result code (admin reasons - TBA make error, general error, add message)
1680 control16(c, 9, t, 1); // assigned tunnel (our end)
1681 controladd(c, t, 0); // send the message
1682 }
1683 }
1684
1685 // read and process packet on tunnel (UDP)
1686 void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
1687 {
1688 char *chapresponse = NULL;
1689 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
1690 uint8_t *p = buf + 2;
1691
1692
1693 CSTAT(processudp);
1694
1695 udp_rx += len;
1696 udp_rx_pkt++;
1697 LOG_HEX(5, "UDP Data", buf, len);
1698 STAT(tunnel_rx_packets);
1699 INC_STAT(tunnel_rx_bytes, len);
1700 if (len < 6)
1701 {
1702 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
1703 STAT(tunnel_rx_errors);
1704 return;
1705 }
1706 if ((buf[1] & 0x0F) != 2)
1707 {
1708 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
1709 STAT(tunnel_rx_errors);
1710 return;
1711 }
1712 if (*buf & 0x40)
1713 { // length
1714 l = ntohs(*(uint16_t *) p);
1715 p += 2;
1716 }
1717 t = ntohs(*(uint16_t *) p);
1718 p += 2;
1719 s = ntohs(*(uint16_t *) p);
1720 p += 2;
1721 if (s >= MAXSESSION)
1722 {
1723 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
1724 STAT(tunnel_rx_errors);
1725 return;
1726 }
1727 if (t >= MAXTUNNEL)
1728 {
1729 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
1730 STAT(tunnel_rx_errors);
1731 return;
1732 }
1733 if (*buf & 0x08)
1734 { // ns/nr
1735 ns = ntohs(*(uint16_t *) p);
1736 p += 2;
1737 nr = ntohs(*(uint16_t *) p);
1738 p += 2;
1739 }
1740 if (*buf & 0x02)
1741 { // offset
1742 uint16_t o = ntohs(*(uint16_t *) p);
1743 p += o + 2;
1744 }
1745 if ((p - buf) > l)
1746 {
1747 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
1748 STAT(tunnel_rx_errors);
1749 return;
1750 }
1751 l -= (p - buf);
1752 if (*buf & 0x80)
1753 { // control
1754 uint16_t message = 0xFFFF; // message type
1755 uint8_t fatal = 0;
1756 uint8_t mandatorymessage = 0;
1757 uint8_t chap = 0; // if CHAP being used
1758 uint16_t asession = 0; // assigned session
1759 uint32_t amagic = 0; // magic number
1760 uint8_t aflags = 0; // flags from last LCF
1761 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1762 int requestchap = 0; // do we request PAP instead of original CHAP request?
1763 char called[MAXTEL] = ""; // called number
1764 char calling[MAXTEL] = ""; // calling number
1765
1766 if (!config->cluster_iam_master)
1767 {
1768 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
1769 return;
1770 }
1771
1772 if ((*buf & 0xCA) != 0xC8)
1773 {
1774 LOG(1, s, t, "Bad control header %02X\n", *buf);
1775 STAT(tunnel_rx_errors);
1776 return;
1777 }
1778
1779 // check for duplicate tunnel open message
1780 if (!t && ns == 0)
1781 {
1782 int i;
1783
1784 //
1785 // Is this a duplicate of the first packet? (SCCRQ)
1786 //
1787 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
1788 {
1789 if (tunnel[i].state != TUNNELOPENING ||
1790 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
1791 tunnel[i].port != ntohs(addr->sin_port) )
1792 continue;
1793 t = i;
1794 LOG(3, s, t, "Duplicate SCCRQ?\n");
1795 break;
1796 }
1797 }
1798
1799 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1800 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
1801
1802 // if no tunnel specified, assign one
1803 if (!t)
1804 {
1805 if (!(t = new_tunnel()))
1806 {
1807 LOG(1, 0, 0, "No more tunnels\n");
1808 STAT(tunnel_overflow);
1809 return;
1810 }
1811 tunnelclear(t);
1812 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
1813 tunnel[t].port = ntohs(addr->sin_port);
1814 tunnel[t].window = 4; // default window
1815 STAT(tunnel_created);
1816 LOG(1, 0, t, " New tunnel from %s:%u ID %d\n",
1817 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
1818 }
1819
1820 // If the 'ns' just received is not the 'nr' we're
1821 // expecting, just send an ack and drop it.
1822 //
1823 // if 'ns' is less, then we got a retransmitted packet.
1824 // if 'ns' is greater than missed a packet. Either way
1825 // we should ignore it.
1826 if (ns != tunnel[t].nr)
1827 {
1828 // is this the sequence we were expecting?
1829 STAT(tunnel_rx_errors);
1830 LOG(1, 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1831 t, ns, tunnel[t].nr);
1832
1833 if (l) // Is this not a ZLB?
1834 controlnull(t);
1835 return;
1836 }
1837
1838 // This is used to time out old tunnels
1839 tunnel[t].lastrec = time_now;
1840
1841 // check sequence of this message
1842 {
1843 int skip = tunnel[t].window; // track how many in-window packets are still in queue
1844 // some to clear maybe?
1845 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
1846 {
1847 controlt *c = tunnel[t].controls;
1848 tunnel[t].controls = c->next;
1849 tunnel[t].controlc--;
1850 c->next = controlfree;
1851 controlfree = c;
1852 skip--;
1853 tunnel[t].try = 0; // we have progress
1854 }
1855
1856 // receiver advance (do here so quoted correctly in any sends below)
1857 if (l) tunnel[t].nr = (ns + 1);
1858 if (skip < 0) skip = 0;
1859 if (skip < tunnel[t].controlc)
1860 {
1861 // some control packets can now be sent that were previous stuck out of window
1862 int tosend = tunnel[t].window - skip;
1863 controlt *c = tunnel[t].controls;
1864 while (c && skip)
1865 {
1866 c = c->next;
1867 skip--;
1868 }
1869 while (c && tosend)
1870 {
1871 tunnel[t].try = 0; // first send
1872 tunnelsend(c->buf, c->length, t);
1873 c = c->next;
1874 tosend--;
1875 }
1876 }
1877 if (!tunnel[t].controlc)
1878 tunnel[t].retry = 0; // caught up
1879 }
1880 if (l)
1881 { // if not a null message
1882 // process AVPs
1883 while (l && !(fatal & 0x80))
1884 {
1885 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
1886 uint8_t *b = p;
1887 uint8_t flags = *p;
1888 uint16_t mtype;
1889 p += n; // next
1890 if (l < n)
1891 {
1892 LOG(1, s, t, "Invalid length in AVP\n");
1893 STAT(tunnel_rx_errors);
1894 fatal = flags;
1895 return;
1896 }
1897 l -= n;
1898 if (flags & 0x40)
1899 {
1900 // handle hidden AVPs
1901 if (!*config->l2tpsecret)
1902 {
1903 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
1904 fatal = flags;
1905 continue;
1906 }
1907 if (!session[s].random_vector_length)
1908 {
1909 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
1910 fatal = flags;
1911 continue;
1912 }
1913 LOG(4, s, t, "Hidden AVP\n");
1914 // Unhide the AVP
1915 n = unhide_avp(b, t, s, n);
1916 if (n == 0)
1917 {
1918 fatal = flags;
1919 continue;
1920 }
1921 }
1922 if (*b & 0x3C)
1923 {
1924 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
1925 fatal = flags;
1926 continue; // next
1927 }
1928 b += 2;
1929 if (*(uint16_t *) (b))
1930 {
1931 LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b)));
1932 fatal = flags;
1933 continue; // next
1934 }
1935 b += 2;
1936 mtype = ntohs(*(uint16_t *) (b));
1937 b += 2;
1938 n -= 6;
1939
1940 LOG(4, s, t, " AVP %d (%s) len %d\n", mtype, avp_name(mtype), n);
1941 switch (mtype)
1942 {
1943 case 0: // message type
1944 message = ntohs(*(uint16_t *) b);
1945 LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_message_type(message));
1946 mandatorymessage = flags;
1947 break;
1948 case 1: // result code
1949 {
1950 uint16_t rescode = ntohs(*(uint16_t *) b);
1951 const char* resdesc = "(unknown)";
1952 if (message == 4)
1953 { /* StopCCN */
1954 resdesc = stopccn_result_code(rescode);
1955 }
1956 else if (message == 14)
1957 { /* CDN */
1958 resdesc = cdn_result_code(rescode);
1959 }
1960
1961 LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc);
1962 if (n >= 4)
1963 {
1964 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
1965 LOG(4, s, t, " Error Code %d: %s\n", errcode, error_code(errcode));
1966 }
1967 if (n > 4)
1968 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
1969
1970 break;
1971 }
1972 break;
1973 case 2: // protocol version
1974 {
1975 version = ntohs(*(uint16_t *) (b));
1976 LOG(4, s, t, " Protocol version = %d\n", version);
1977 if (version && version != 0x0100)
1978 { // allow 0.0 and 1.0
1979 LOG(1, s, t, " Bad protocol version %04X\n", version);
1980 fatal = flags;
1981 continue; // next
1982 }
1983 }
1984 break;
1985 case 3: // framing capabilities
1986 // LOG(4, s, t, "Framing capabilities\n");
1987 break;
1988 case 4: // bearer capabilities
1989 // LOG(4, s, t, "Bearer capabilities\n");
1990 break;
1991 case 5: // tie breaker
1992 // We never open tunnels, so we don't care about tie breakers
1993 // LOG(4, s, t, "Tie breaker\n");
1994 continue;
1995 case 6: // firmware revision
1996 // LOG(4, s, t, "Firmware revision\n");
1997 break;
1998 case 7: // host name
1999 memset(tunnel[t].hostname, 0, 128);
2000 memcpy(tunnel[t].hostname, b, (n >= 127) ? 127 : n);
2001 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2002 // TBA - to send to RADIUS
2003 break;
2004 case 8: // vendor name
2005 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2006 memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n);
2007 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2008 break;
2009 case 9: // assigned tunnel
2010 tunnel[t].far = ntohs(*(uint16_t *) (b));
2011 LOG(4, s, t, " Remote tunnel id = %d\n", tunnel[t].far);
2012 break;
2013 case 10: // rx window
2014 tunnel[t].window = ntohs(*(uint16_t *) (b));
2015 if (!tunnel[t].window)
2016 tunnel[t].window = 1; // window of 0 is silly
2017 LOG(4, s, t, " rx window = %d\n", tunnel[t].window);
2018 break;
2019 case 11: // Challenge
2020 {
2021 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2022 build_chap_response(b, 2, n, &chapresponse);
2023 }
2024 break;
2025 case 13: // Response
2026 // Why did they send a response? We never challenge.
2027 LOG(2, s, t, " received unexpected challenge response\n");
2028 break;
2029
2030 case 14: // assigned session
2031 asession = session[s].far = ntohs(*(uint16_t *) (b));
2032 LOG(4, s, t, " assigned session = %d\n", asession);
2033 break;
2034 case 15: // call serial number
2035 LOG(4, s, t, " call serial number = %d\n", ntohl(*(uint32_t *)b));
2036 break;
2037 case 18: // bearer type
2038 LOG(4, s, t, " bearer type = %d\n", ntohl(*(uint32_t *)b));
2039 // TBA - for RADIUS
2040 break;
2041 case 19: // framing type
2042 LOG(4, s, t, " framing type = %d\n", ntohl(*(uint32_t *)b));
2043 // TBA
2044 break;
2045 case 21: // called number
2046 memset(called, 0, MAXTEL);
2047 memcpy(called, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
2048 LOG(4, s, t, " Called <%s>\n", called);
2049 break;
2050 case 22: // calling number
2051 memset(calling, 0, MAXTEL);
2052 memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
2053 LOG(4, s, t, " Calling <%s>\n", calling);
2054 break;
2055 case 23: // subtype
2056 break;
2057 case 24: // tx connect speed
2058 if (n == 4)
2059 {
2060 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2061 }
2062 else
2063 {
2064 // AS5300s send connect speed as a string
2065 char tmp[30] = {0};
2066 memcpy(tmp, b, (n >= 30) ? 30 : n);
2067 session[s].tx_connect_speed = atol(tmp);
2068 }
2069 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2070 break;
2071 case 38: // rx connect speed
2072 if (n == 4)
2073 {
2074 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2075 }
2076 else
2077 {
2078 // AS5300s send connect speed as a string
2079 char tmp[30] = {0};
2080 memcpy(tmp, b, (n >= 30) ? 30 : n);
2081 session[s].rx_connect_speed = atol(tmp);
2082 }
2083 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2084 break;
2085 case 25: // Physical Channel ID
2086 {
2087 uint32_t tmp = ntohl(*(uint32_t *) b);
2088 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2089 break;
2090 }
2091 case 29: // Proxy Authentication Type
2092 {
2093 uint16_t atype = ntohs(*(uint16_t *)b);
2094 LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, auth_type(atype));
2095 requestchap = (atype == 2);
2096 break;
2097 }
2098 case 30: // Proxy Authentication Name
2099 {
2100 char authname[64] = {0};
2101 memcpy(authname, b, (n > 63) ? 63 : n);
2102 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2103 authname);
2104 break;
2105 }
2106 case 31: // Proxy Authentication Challenge
2107 {
2108 memcpy(radius[session[s].radius].auth, b, 16);
2109 LOG(4, s, t, " Proxy Auth Challenge\n");
2110 break;
2111 }
2112 case 32: // Proxy Authentication ID
2113 {
2114 uint16_t authid = ntohs(*(uint16_t *)(b));
2115 LOG(4, s, t, " Proxy Auth ID (%d)\n", authid);
2116 if (session[s].radius)
2117 radius[session[s].radius].id = authid;
2118 break;
2119 }
2120 case 33: // Proxy Authentication Response
2121 {
2122 char authresp[64] = {0};
2123 memcpy(authresp, b, (n > 63) ? 63 : n);
2124 LOG(4, s, t, " Proxy Auth Response\n");
2125 break;
2126 }
2127 case 27: // last send lcp
2128 { // find magic number
2129 uint8_t *p = b, *e = p + n;
2130 while (p + 1 < e && p[1] && p + p[1] <= e)
2131 {
2132 if (*p == 5 && p[1] == 6) // Magic-Number
2133 amagic = ntohl(*(uint32_t *) (p + 2));
2134 else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol
2135 chap = 1;
2136 else if (*p == 7) // Protocol-Field-Compression
2137 aflags |= SESSIONPFC;
2138 else if (*p == 8) // Address-and-Control-Field-Compression
2139 aflags |= SESSIONACFC;
2140 p += p[1];
2141 }
2142 }
2143 break;
2144 case 28: // last recv lcp confreq
2145 break;
2146 case 26: // Initial Received LCP CONFREQ
2147 break;
2148 case 39: // seq required - we control it as an LNS anyway...
2149 break;
2150 case 36: // Random Vector
2151 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2152 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2153 memcpy(session[s].random_vector, b, n);
2154 session[s].random_vector_length = n;
2155 break;
2156 default:
2157 LOG(2, s, t, " Unknown AVP type %d\n", mtype);
2158 fatal = flags;
2159 continue; // next
2160 }
2161 }
2162 // process message
2163 if (fatal & 0x80)
2164 tunnelshutdown(t, "Unknown Mandatory AVP");
2165 else
2166 switch (message)
2167 {
2168 case 1: // SCCRQ - Start Control Connection Request
2169 {
2170 controlt *c = controlnew(2); // sending SCCRP
2171 control16(c, 2, version, 1); // protocol version
2172 control32(c, 3, 3, 1); // framing
2173 controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
2174 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2175 control16(c, 9, t, 1); // assigned tunnel
2176 controladd(c, t, s); // send the resply
2177 }
2178 tunnel[t].state = TUNNELOPENING;
2179 break;
2180 case 2: // SCCRP
2181 tunnel[t].state = TUNNELOPEN;
2182 break;
2183 case 3: // SCCN
2184 tunnel[t].state = TUNNELOPEN;
2185 controlnull(t); // ack
2186 break;
2187 case 4: // StopCCN
2188 controlnull(t); // ack
2189 tunnelshutdown(t, "Stopped"); // Shut down cleanly
2190 tunnelkill(t, "Stopped"); // Immediately force everything dead
2191 break;
2192 case 6: // HELLO
2193 controlnull(t); // simply ACK
2194 break;
2195 case 7: // OCRQ
2196 // TBA
2197 break;
2198 case 8: // OCRO
2199 // TBA
2200 break;
2201 case 9: // OCCN
2202 // TBA
2203 break;
2204 case 10: // ICRQ
2205 if (!sessionfree)
2206 {
2207 STAT(session_overflow);
2208 tunnelshutdown(t, "No free sessions");
2209 }
2210 else
2211 {
2212 uint16_t r;
2213 controlt *c;
2214
2215 s = sessionfree;
2216 sessionfree = session[s].next;
2217 memset(&session[s], 0, sizeof(session[s]));
2218
2219 if (s > config->cluster_highest_sessionid)
2220 config->cluster_highest_sessionid = s;
2221
2222 // make a RADIUS session
2223 if (!(r = radiusnew(s)))
2224 {
2225 LOG(1, s, t, "No free RADIUS sessions for ICRQ\n");
2226 sessionkill(s, "no free RADIUS sesions");
2227 return;
2228 }
2229
2230 c = controlnew(11); // sending ICRP
2231 session[s].id = sessionid++;
2232 session[s].opened = time(NULL);
2233 session[s].tunnel = t;
2234 session[s].far = asession;
2235 session[s].last_packet = time_now;
2236 LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
2237 control16(c, 14, s, 1); // assigned session
2238 controladd(c, t, s); // send the reply
2239
2240 // Generate a random challenge
2241 random_data(radius[r].auth, sizeof(radius[r].auth));
2242 strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1);
2243 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2244 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2245 STAT(session_created);
2246 }
2247 break;
2248 case 11: // ICRP
2249 // TBA
2250 break;
2251 case 12: // ICCN
2252 if (amagic == 0) amagic = time_now;
2253 session[s].magic = amagic; // set magic number
2254 session[s].l2tp_flags = aflags; // set flags received
2255 LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags);
2256 controlnull(t); // ack
2257 // In CHAP state, request PAP instead
2258 if (requestchap)
2259 initlcp(t, s);
2260 break;
2261 case 14: // CDN
2262 controlnull(t); // ack
2263 sessionshutdown(s, "Closed (Received CDN)");
2264 break;
2265 case 0xFFFF:
2266 LOG(1, s, t, "Missing message type\n");
2267 break;
2268 default:
2269 STAT(tunnel_rx_errors);
2270 if (mandatorymessage & 0x80)
2271 tunnelshutdown(t, "Unknown message");
2272 else
2273 LOG(1, s, t, "Unknown message type %d\n", message);
2274 break;
2275 }
2276 if (chapresponse) free(chapresponse);
2277 cluster_send_tunnel(t);
2278 }
2279 else
2280 {
2281 LOG(4, s, t, " Got a ZLB ack\n");
2282 }
2283 }
2284 else
2285 { // data
2286 uint16_t prot;
2287
2288 LOG_HEX(5, "Receive Tunnel Data", p, l);
2289 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2290 { // HDLC address header, discard
2291 p += 2;
2292 l -= 2;
2293 }
2294 if (l < 2)
2295 {
2296 LOG(1, s, t, "Short ppp length %d\n", l);
2297 STAT(tunnel_rx_errors);
2298 return;
2299 }
2300 if (*p & 1)
2301 {
2302 prot = *p++;
2303 l--;
2304 }
2305 else
2306 {
2307 prot = ntohs(*(uint16_t *) p);
2308 p += 2;
2309 l -= 2;
2310 }
2311
2312 if (s && !session[s].tunnel) // Is something wrong??
2313 {
2314 if (!config->cluster_iam_master)
2315 {
2316 // Pass it off to the master to deal with..
2317 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2318 return;
2319 }
2320
2321
2322 LOG(1, s, t, "UDP packet contains session %d but no session[%d].tunnel "
2323 "exists (LAC said tunnel = %d). Dropping packet.\n", s, s, t);
2324
2325 STAT(tunnel_rx_errors);
2326 return;
2327 }
2328
2329 if (prot == PPPPAP)
2330 {
2331 session[s].last_packet = time_now;
2332 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2333 processpap(t, s, p, l);
2334 }
2335 else if (prot == PPPCHAP)
2336 {
2337 session[s].last_packet = time_now;
2338 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2339 processchap(t, s, p, l);
2340 }
2341 else if (prot == PPPLCP)
2342 {
2343 session[s].last_packet = time_now;
2344 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2345 processlcp(t, s, p, l);
2346 }
2347 else if (prot == PPPIPCP)
2348 {
2349 session[s].last_packet = time_now;
2350 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2351 processipcp(t, s, p, l);
2352 }
2353 else if (prot == PPPIPV6CP)
2354 {
2355 if (config->ipv6_prefix.s6_addr[0] > 0)
2356 {
2357 session[s].last_packet = time_now;
2358 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2359 processipv6cp(t, s, p, l);
2360 }
2361 else
2362 {
2363 LOG(1, s, t, "IPv6 not configured; ignoring IPv6CP\n");
2364 }
2365 }
2366 else if (prot == PPPCCP)
2367 {
2368 session[s].last_packet = time_now;
2369 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
2370 processccp(t, s, p, l);
2371 }
2372 else if (prot == PPPIP)
2373 {
2374 if (session[s].die)
2375 {
2376 LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
2377 return; // closing session, PPP not processed
2378 }
2379
2380 session[s].last_packet = time_now;
2381 if (session[s].walled_garden && !config->cluster_iam_master)
2382 {
2383 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2384 return;
2385 }
2386
2387 processipin(t, s, p, l);
2388 }
2389 else if (prot == PPPIPV6)
2390 {
2391 if (!config->ipv6_prefix.s6_addr[0] > 0)
2392 {
2393 LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2394 return;
2395 }
2396 if (session[s].die)
2397 {
2398 LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
2399 return; // closing session, PPP not processed
2400 }
2401
2402 session[s].last_packet = time_now;
2403 if (session[s].walled_garden && !config->cluster_iam_master)
2404 {
2405 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2406 return;
2407 }
2408
2409 processipv6in(t, s, p, l);
2410 }
2411 else
2412 {
2413 STAT(tunnel_rx_errors);
2414 LOG(1, s, t, "Unknown PPP protocol %04X\n", prot);
2415 }
2416 }
2417 }
2418
2419 // read and process packet on tun
2420 static void processtun(uint8_t * buf, int len)
2421 {
2422 LOG_HEX(5, "Receive TUN Data", buf, len);
2423 STAT(tun_rx_packets);
2424 INC_STAT(tun_rx_bytes, len);
2425
2426 CSTAT(processtun);
2427
2428 eth_rx_pkt++;
2429 eth_rx += len;
2430 if (len < 22)
2431 {
2432 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
2433 STAT(tun_rx_errors);
2434 return;
2435 }
2436
2437 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
2438 processipout(buf, len);
2439 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
2440 && config->ipv6_prefix.s6_addr[0] > 0)
2441 processipv6out(buf, len);
2442
2443 // Else discard.
2444 }
2445
2446 //
2447 // Maximum number of actions to complete.
2448 // This is to avoid sending out too many packets
2449 // at once.
2450 #define MAX_ACTIONS 500
2451
2452 static int regular_cleanups(void)
2453 {
2454 static sessionidt s = 0; // Next session to check for actions on.
2455 tunnelidt t;
2456 int count=0,i;
2457 uint16_t r;
2458 static clockt next_acct = 0;
2459 static clockt next_shut_acct = 0;
2460 int a;
2461
2462 LOG(3, 0, 0, "Begin regular cleanup\n");
2463
2464 for (r = 1; r < MAXRADIUS; r++)
2465 {
2466 if (!radius[r].state)
2467 continue;
2468 if (radius[r].retry)
2469 {
2470 if (radius[r].retry <= TIME)
2471 radiusretry(r);
2472 } else
2473 radius[r].retry = backoff(radius[r].try+1); // Is this really needed? --mo
2474 }
2475 for (t = 1; t <= config->cluster_highest_tunnelid; t++)
2476 {
2477 // check for expired tunnels
2478 if (tunnel[t].die && tunnel[t].die <= TIME)
2479 {
2480 STAT(tunnel_timeout);
2481 tunnelkill(t, "Expired");
2482 continue;
2483 }
2484 // check for message resend
2485 if (tunnel[t].retry && tunnel[t].controlc)
2486 {
2487 // resend pending messages as timeout on reply
2488 if (tunnel[t].retry <= TIME)
2489 {
2490 controlt *c = tunnel[t].controls;
2491 uint8_t w = tunnel[t].window;
2492 tunnel[t].try++; // another try
2493 if (tunnel[t].try > 5)
2494 tunnelkill(t, "Timeout on control message"); // game over
2495 else
2496 while (c && w--)
2497 {
2498 tunnelsend(c->buf, c->length, t);
2499 c = c->next;
2500 }
2501 }
2502 }
2503 // Send hello
2504 if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
2505 {
2506 controlt *c = controlnew(6); // sending HELLO
2507 controladd(c, t, 0); // send the message
2508 LOG(3, 0, t, "Sending HELLO message\n");
2509 }
2510
2511 // Check for tunnel changes requested from the CLI
2512 if ((a = cli_tunnel_actions[t].action))
2513 {
2514 cli_tunnel_actions[t].action = 0;
2515 if (a & CLI_TUN_KILL)
2516 {
2517 LOG(2, 0, t, "Dropping tunnel by CLI\n");
2518 tunnelshutdown(t, "Requested by administrator");
2519 }
2520 }
2521
2522 }
2523
2524 count = 0;
2525 for (i = 1; i <= config->cluster_highest_sessionid; i++)
2526 {
2527 s++;
2528 if (s > config->cluster_highest_sessionid)
2529 s = 1;
2530
2531 if (!session[s].tunnel) // Session isn't in use
2532 continue;
2533
2534 if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
2535 {
2536 // IPCP has not completed yet. Resend
2537 LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
2538 sendipcp(session[s].tunnel, s);
2539 }
2540
2541 // check for expired sessions
2542 if (session[s].die && session[s].die <= TIME)
2543 {
2544 sessionkill(s, "Expired");
2545 if (++count >= MAX_ACTIONS) break;
2546 continue;
2547 }
2548
2549 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2550 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
2551 {
2552 sessionshutdown(s, "No response to LCP ECHO requests");
2553 STAT(session_timeout);
2554 if (++count >= MAX_ACTIONS) break;
2555 continue;
2556 }
2557
2558 // No data in IDLE_TIMEOUT seconds, send LCP ECHO
2559 if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
2560 {
2561 uint8_t b[MAXCONTROL] = {0};
2562
2563 uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
2564 if (!q) continue;
2565
2566 *q = EchoReq;
2567 *(uint8_t *)(q + 1) = (time_now % 255); // ID
2568 *(uint16_t *)(q + 2) = htons(8); // Length
2569 *(uint32_t *)(q + 4) = 0; // Magic Number (not supported)
2570
2571 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
2572 (int)(time_now - session[s].last_packet));
2573 tunnelsend(b, 24, session[s].tunnel); // send it
2574 if (++count >= MAX_ACTIONS) break;
2575 }
2576
2577 // Check for actions requested from the CLI
2578 if ((a = cli_session_actions[s].action))
2579 {
2580 int send = 0;
2581
2582 cli_session_actions[s].action = 0;
2583 if (a & CLI_SESS_KILL)
2584 {
2585 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
2586 sessionshutdown(s, "Requested by administrator");
2587 a = 0; // dead, no need to check for other actions
2588 }
2589
2590 if (a & CLI_SESS_NOSNOOP)
2591 {
2592 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
2593 session[s].snoop_ip = 0;
2594 session[s].snoop_port = 0;
2595 send++;
2596 }
2597 else if (a & CLI_SESS_SNOOP)
2598 {
2599 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
2600 fmtaddr(cli_session_actions[s].snoop_ip, 0),
2601 cli_session_actions[s].snoop_port);
2602
2603 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
2604 session[s].snoop_port = cli_session_actions[s].snoop_port;
2605 send++;
2606 }
2607
2608 if (a & CLI_SESS_NOTHROTTLE)
2609 {
2610 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
2611 throttle_session(s, 0, 0);
2612 send++;
2613 }
2614 else if (a & CLI_SESS_THROTTLE)
2615 {
2616 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2617 cli_session_actions[s].throttle_in,
2618 cli_session_actions[s].throttle_out);
2619
2620 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
2621 send++;
2622 }
2623
2624 if (a & CLI_SESS_NOFILTER)
2625 {
2626 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
2627 filter_session(s, 0, 0);
2628 send++;
2629 }
2630 else if (a & CLI_SESS_FILTER)
2631 {
2632 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
2633 cli_session_actions[s].filter_in,
2634 cli_session_actions[s].filter_out);
2635
2636 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
2637 send++;
2638 }
2639
2640 if (send)
2641 cluster_send_session(s);
2642
2643 if (++count >= MAX_ACTIONS) break;
2644 }
2645 }
2646
2647 if (*config->accounting_dir)
2648 {
2649 if (next_acct <= TIME)
2650 {
2651 // Dump accounting data
2652 next_acct = TIME + ACCT_TIME;
2653 next_shut_acct = TIME + ACCT_SHUT_TIME;
2654 dump_acct_info(1);
2655 }
2656 else if (next_shut_acct <= TIME)
2657 {
2658 // Dump accounting data for shutdown sessions
2659 next_shut_acct = TIME + ACCT_SHUT_TIME;
2660 if (shut_acct_n)
2661 dump_acct_info(0);
2662 }
2663 }
2664
2665 if (count >= MAX_ACTIONS)
2666 return 1; // Didn't finish!
2667
2668 LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval);
2669 return 0;
2670 }
2671
2672
2673 //
2674 // Are we in the middle of a tunnel update, or radius
2675 // requests??
2676 //
2677 static int still_busy(void)
2678 {
2679 int i;
2680 static clockt last_talked = 0;
2681 static clockt start_busy_wait = 0;
2682 if (start_busy_wait == 0)
2683 start_busy_wait = TIME;
2684
2685 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
2686 {
2687 if (!tunnel[i].controlc)
2688 continue;
2689
2690 if (last_talked != TIME)
2691 {
2692 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i);
2693 last_talked = TIME;
2694 }
2695 return 1;
2696 }
2697
2698 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2699 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
2700 {
2701 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2702 return 0;
2703 }
2704
2705 for (i = 1; i < MAXRADIUS; i++)
2706 {
2707 if (radius[i].state == RADIUSNULL)
2708 continue;
2709 if (radius[i].state == RADIUSWAIT)
2710 continue;
2711
2712 if (last_talked != TIME)
2713 {
2714 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
2715 last_talked = TIME;
2716 }
2717 return 1;
2718 }
2719
2720 return 0;
2721 }
2722
2723 static fd_set readset;
2724 static int readset_n = 0;
2725
2726 // main loop - gets packets on tun or udp and processes them
2727 static void mainloop(void)
2728 {
2729 int i;
2730 uint8_t buf[65536];
2731 struct timeval to;
2732 clockt next_cluster_ping = 0; // send initial ping immediately
2733 time_t next_clean = time_now + config->cleanup_interval;
2734
2735 LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2736 udpfd, tunfd, cluster_sockfd, controlfd);
2737
2738 FD_ZERO(&readset);
2739 FD_SET(udpfd, &readset);
2740 FD_SET(tunfd, &readset);
2741 FD_SET(controlfd, &readset);
2742 FD_SET(clifd, &readset);
2743 if (cluster_sockfd) FD_SET(cluster_sockfd, &readset);
2744 readset_n = udpfd;
2745 if (tunfd > readset_n) readset_n = tunfd;
2746 if (controlfd > readset_n) readset_n = controlfd;
2747 if (clifd > readset_n) readset_n = clifd;
2748 if (cluster_sockfd > readset_n) readset_n = cluster_sockfd;
2749
2750 while (!main_quit || still_busy())
2751 {
2752 fd_set r;
2753 int n = readset_n;
2754 #ifdef BGP
2755 fd_set w;
2756 int bgp_set[BGP_NUM_PEERS];
2757 #endif /* BGP */
2758
2759 if (config->reload_config)
2760 {
2761 // Update the config state based on config settings
2762 update_config();
2763 }
2764
2765 memcpy(&r, &readset, sizeof(fd_set));
2766 to.tv_sec = 0;
2767 to.tv_usec = 100000; // 1/10th of a second.
2768
2769 #ifdef BGP
2770 FD_ZERO(&w);
2771 for (i = 0; i < BGP_NUM_PEERS; i++)
2772 {
2773 bgp_set[i] = bgp_select_state(&bgp_peers[i]);
2774 if (bgp_set[i] & 1)
2775 {
2776 FD_SET(bgp_peers[i].sock, &r);
2777 if (bgp_peers[i].sock > n)
2778 n = bgp_peers[i].sock;
2779 }
2780
2781 if (bgp_set[i] & 2)
2782 {
2783 FD_SET(bgp_peers[i].sock, &w);
2784 if (bgp_peers[i].sock > n)
2785 n = bgp_peers[i].sock;
2786 }
2787 }
2788
2789 n = select(n + 1, &r, &w, 0, &to);
2790 #else /* BGP */
2791 n = select(n + 1, &r, 0, 0, &to);
2792 #endif /* BGP */
2793
2794 STAT(select_called);
2795
2796 TIME = now();
2797 if (n < 0)
2798 {
2799 if (errno == EINTR ||
2800 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
2801 continue;
2802
2803 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
2804 main_quit++;
2805 break;
2806 }
2807 else if (n)
2808 {
2809 struct sockaddr_in addr;
2810 int alen, c, s;
2811 int udp_pkts = 0;
2812 int tun_pkts = 0;
2813 int cluster_pkts = 0;
2814
2815 // nsctl commands
2816 if (FD_ISSET(controlfd, &r))
2817 {
2818 alen = sizeof(addr);
2819 processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
2820 n--;
2821 }
2822
2823 // RADIUS responses
2824 if (config->cluster_iam_master)
2825 {
2826 for (i = 0; i < config->num_radfds; i++)
2827 {
2828 if (FD_ISSET(radfds[i], &r))
2829 {
2830 processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i);
2831 n--;
2832 }
2833 }
2834 }
2835
2836 // CLI connections
2837 if (FD_ISSET(clifd, &r))
2838 {
2839 int cli;
2840
2841 alen = sizeof(addr);
2842 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
2843 {
2844 cli_do(cli);
2845 close(cli);
2846 }
2847 else
2848 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
2849
2850 n--;
2851 }
2852
2853 #ifdef BGP
2854 for (i = 0; i < BGP_NUM_PEERS; i++)
2855 {
2856 int isr = bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &r) : 0;
2857 int isw = bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &w) : 0;
2858 bgp_process(&bgp_peers[i], isr, isw);
2859 if (isr) n--;
2860 if (isw) n--;
2861 }
2862 #endif /* BGP */
2863
2864 for (c = 0; n && c < config->multi_read_count; c++)
2865 {
2866 // L2TP
2867 if (FD_ISSET(udpfd, &r))
2868 {
2869 alen = sizeof(addr);
2870 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
2871 {
2872 processudp(buf, s, &addr);
2873 udp_pkts++;
2874 }
2875 else
2876 {
2877 FD_CLR(udpfd, &r);
2878 n--;
2879 }
2880 }
2881
2882 // incoming IP
2883 if (FD_ISSET(tunfd, &r))
2884 {
2885 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
2886 {
2887 processtun(buf, s);
2888 tun_pkts++;
2889 }
2890 else
2891 {
2892 FD_CLR(tunfd, &r);
2893 n--;
2894 }
2895 }
2896
2897 // cluster
2898 if (FD_ISSET(cluster_sockfd, &r))
2899 {
2900 alen = sizeof(addr);
2901 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
2902 {
2903 processcluster(buf, s, addr.sin_addr.s_addr);
2904 cluster_pkts++;
2905 }
2906 else
2907 {
2908 FD_CLR(cluster_sockfd, &r);
2909 n--;
2910 }
2911 }
2912 }
2913
2914 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
2915 STAT(multi_read_used);
2916
2917 if (c >= config->multi_read_count)
2918 {
2919 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
2920 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
2921
2922 STAT(multi_read_exceeded);
2923 }
2924 }
2925
2926 // Runs on every machine (master and slaves).
2927 if (cluster_sockfd && next_cluster_ping <= TIME)
2928 {
2929 // Check to see which of the cluster is still alive..
2930
2931 cluster_send_ping(basetime); // Only does anything if we're a slave
2932 cluster_check_master(); // ditto.
2933
2934 cluster_heartbeat(); // Only does anything if we're a master.
2935 cluster_check_slaves(); // ditto.
2936
2937 master_update_counts(); // If we're a slave, send our byte counters to our master.
2938
2939 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
2940 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
2941 else
2942 next_cluster_ping = TIME + config->cluster_hb_interval;
2943 }
2944
2945 // Run token bucket filtering queue..
2946 // Only run it every 1/10th of a second.
2947 // Runs on all machines both master and slave.
2948 {
2949 static clockt last_run = 0;
2950 if (last_run != TIME)
2951 {
2952 last_run = TIME;
2953 tbf_run_timer();
2954 }
2955 }
2956
2957 /* Handle timeouts. Make sure that this gets run anyway, even if there was
2958 * something to read, else under load this will never actually run....
2959 *
2960 */
2961 if (config->cluster_iam_master && next_clean <= time_now)
2962 {
2963 if (regular_cleanups())
2964 {
2965 // Did it finish?
2966 next_clean = time_now + 1 ; // Didn't finish. Check quickly.
2967 }
2968 else
2969 {
2970 next_clean = time_now + config->cleanup_interval; // Did. Move to next interval.
2971 }
2972 }
2973 }
2974
2975 // Are we the master and shutting down??
2976 if (config->cluster_iam_master)
2977 cluster_heartbeat(); // Flush any queued changes..
2978
2979 // Ok. Notify everyone we're shutting down. If we're
2980 // the master, this will force an election.
2981 cluster_send_ping(0);
2982
2983 //
2984 // Important!!! We MUST not process any packets past this point!
2985 }
2986
2987 static void stripdomain(char *host)
2988 {
2989 char *p;
2990
2991 if ((p = strchr(host, '.')))
2992 {
2993 char *domain = 0;
2994 char _domain[1024];
2995
2996 // strip off domain
2997 FILE *resolv = fopen("/etc/resolv.conf", "r");
2998 if (resolv)
2999 {
3000 char buf[1024];
3001 char *b;
3002
3003 while (fgets(buf, sizeof(buf), resolv))
3004 {
3005 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
3006 continue;
3007
3008 if (!isspace(buf[6]))
3009 continue;
3010
3011 b = buf + 7;
3012 while (isspace(*b)) b++;
3013
3014 if (*b)
3015 {
3016 char *d = b;
3017 while (*b && !isspace(*b)) b++;
3018 *b = 0;
3019 if (buf[0] == 'd') // domain is canonical
3020 {
3021 domain = d;
3022 break;
3023 }
3024
3025 // first search line
3026 if (!domain)
3027 {
3028 // hold, may be subsequent domain line
3029 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
3030 domain = _domain;
3031 }
3032 }
3033 }
3034
3035 fclose(resolv);
3036 }
3037
3038 if (domain)
3039 {
3040 int hl = strlen(host);
3041 int dl = strlen(domain);
3042 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
3043 host[hl -dl - 1] = 0;
3044 }
3045 else
3046 {
3047 *p = 0; // everything after first dot
3048 }
3049 }
3050 }
3051
3052 // Init data structures
3053 static void initdata(int optdebug, char *optconfig)
3054 {
3055 int i;
3056
3057 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
3058 {
3059 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
3060 exit(1);
3061 }
3062 if (!(config = shared_malloc(sizeof(configt))))
3063 {
3064 LOG(0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno));
3065 exit(1);
3066 }
3067 memset(config, 0, sizeof(configt));
3068 time(&config->start_time);
3069 strncpy(config->config_file, optconfig, strlen(optconfig));
3070 config->debug = optdebug;
3071 config->num_tbfs = MAXTBFS;
3072 config->rl_rate = 28; // 28kbps
3073 strcpy(config->random_device, RANDOMDEVICE);
3074
3075 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
3076 {
3077 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
3078 exit(1);
3079 }
3080 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
3081 {
3082 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
3083 exit(1);
3084 }
3085
3086 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
3087 {
3088 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
3089 exit(1);
3090 }
3091
3092 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
3093 {
3094 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
3095 exit(1);
3096 }
3097
3098 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
3099 {
3100 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
3101 exit(1);
3102 }
3103
3104 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
3105 {
3106 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
3107 exit(1);
3108 }
3109 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
3110
3111 #ifdef RINGBUFFER
3112 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
3113 {
3114 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
3115 exit(1);
3116 }
3117 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
3118 #endif
3119
3120 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
3121 {
3122 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
3123 exit(1);
3124 }
3125 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
3126
3127 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
3128 {
3129 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
3130 exit(1);
3131 }
3132 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
3133
3134 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
3135 memset(session, 0, sizeof(sessiont) * MAXSESSION);
3136 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
3137 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
3138
3139 // Put all the sessions on the free list marked as undefined.
3140 for (i = 1; i < MAXSESSION - 1; i++)
3141 {
3142 session[i].next = i + 1;
3143 session[i].tunnel = T_UNDEF; // mark it as not filled in.
3144 }
3145 session[MAXSESSION - 1].next = 0;
3146 sessionfree = 1;
3147
3148 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3149 for (i = 1; i < MAXTUNNEL- 1; i++)
3150 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
3151
3152 if (!*hostname)
3153 {
3154 // Grab my hostname unless it's been specified
3155 gethostname(hostname, sizeof(hostname));
3156 stripdomain(hostname);
3157 }
3158
3159 _statistics->start_time = _statistics->last_reset = time(NULL);
3160
3161 #ifdef BGP
3162 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
3163 {
3164 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
3165 exit(1);
3166 }
3167 #endif /* BGP */
3168 }
3169
3170 static int assign_ip_address(sessionidt s)
3171 {
3172 uint32_t i;
3173 int best = -1;
3174 time_t best_time = time_now;
3175 char *u = session[s].user;
3176 char reuse = 0;
3177
3178
3179 CSTAT(assign_ip_address);
3180
3181 for (i = 1; i < ip_pool_size; i++)
3182 {
3183 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
3184 continue;
3185
3186 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
3187 {
3188 best = i;
3189 reuse = 1;
3190 break;
3191 }
3192
3193 if (ip_address_pool[i].last < best_time)
3194 {
3195 best = i;
3196 if (!(best_time = ip_address_pool[i].last))
3197 break; // never used, grab this one
3198 }
3199 }
3200
3201 if (best < 0)
3202 {
3203 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
3204 return 0;
3205 }
3206
3207 session[s].ip = ip_address_pool[best].address;
3208 session[s].ip_pool_index = best;
3209 ip_address_pool[best].assigned = 1;
3210 ip_address_pool[best].last = time_now;
3211 ip_address_pool[best].session = s;
3212 if (session[s].walled_garden)
3213 /* Don't track addresses of users in walled garden (note: this
3214 means that their address isn't "sticky" even if they get
3215 un-gardened). */
3216 ip_address_pool[best].user[0] = 0;
3217 else
3218 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
3219
3220 STAT(ip_allocated);
3221 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
3222 reuse ? "Reusing" : "Allocating", best);
3223
3224 return 1;
3225 }
3226
3227 static void free_ip_address(sessionidt s)
3228 {
3229 int i = session[s].ip_pool_index;
3230
3231
3232 CSTAT(free_ip_address);
3233
3234 if (!session[s].ip)
3235 return; // what the?
3236
3237 if (i < 0) // Is this actually part of the ip pool?
3238 i = 0;
3239
3240 STAT(ip_freed);
3241 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
3242 session[s].ip = 0;
3243 ip_address_pool[i].assigned = 0;
3244 ip_address_pool[i].session = 0;
3245 ip_address_pool[i].last = time_now;
3246 }
3247
3248 //
3249 // Fsck the address pool against the session table.
3250 // Normally only called when we become a master.
3251 //
3252 // This isn't perfect: We aren't keep tracking of which
3253 // users used to have an IP address.
3254 //
3255 void rebuild_address_pool(void)
3256 {
3257 int i;
3258
3259 //
3260 // Zero the IP pool allocation, and build
3261 // a map from IP address to pool index.
3262 for (i = 1; i < MAXIPPOOL; ++i)
3263 {
3264 ip_address_pool[i].assigned = 0;
3265 ip_address_pool[i].session = 0;
3266 if (!ip_address_pool[i].address)
3267 continue;
3268
3269 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
3270 }
3271
3272 for (i = 0; i < MAXSESSION; ++i)
3273 {
3274 int ipid;
3275 if (!session[i].ip || !session[i].tunnel)
3276 continue;
3277 ipid = - lookup_ipmap(htonl(session[i].ip));
3278
3279 if (session[i].ip_pool_index < 0)
3280 {
3281 // Not allocated out of the pool.
3282 if (ipid < 1) // Not found in the pool either? good.
3283 continue;
3284
3285 LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3286 i, fmtaddr(session[i].ip, 0), ipid);
3287
3288 // Fall through and process it as part of the pool.
3289 }
3290
3291
3292 if (ipid > MAXIPPOOL || ipid < 0)
3293 {
3294 LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
3295 ipid = -1;
3296 session[i].ip_pool_index = ipid;
3297 continue;
3298 }
3299
3300 ip_address_pool[ipid].assigned = 1;
3301 ip_address_pool[ipid].session = i;
3302 ip_address_pool[ipid].last = time_now;
3303 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
3304 session[i].ip_pool_index = ipid;
3305 cache_ipmap(session[i].ip, i); // Fix the ip map.
3306 }
3307 }
3308
3309 //
3310 // Fix the address pool to match a changed session.
3311 // (usually when the master sends us an update).
3312 static void fix_address_pool(int sid)
3313 {
3314 int ipid;
3315
3316 ipid = session[sid].ip_pool_index;
3317
3318 if (ipid > ip_pool_size)
3319 return; // Ignore it. rebuild_address_pool will fix it up.
3320
3321 if (ip_address_pool[ipid].address != session[sid].ip)
3322 return; // Just ignore it. rebuild_address_pool will take care of it.
3323
3324 ip_address_pool[ipid].assigned = 1;
3325 ip_address_pool[ipid].session = sid;
3326 ip_address_pool[ipid].last = time_now;
3327 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
3328 }
3329
3330 //
3331 // Add a block of addresses to the IP pool to hand out.
3332 //
3333 static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
3334 {
3335 int i;
3336 if (mask == 0)
3337 mask = 0xffffffff; // Host route only.
3338
3339 addr &= mask;
3340
3341 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
3342 return ;
3343
3344 for (i = addr ;(i & mask) == addr; ++i)
3345 {
3346 if ((i & 0xff) == 0 || (i&0xff) == 255)
3347 continue; // Skip 0 and broadcast addresses.
3348
3349 ip_address_pool[ip_pool_size].address = i;
3350 ip_address_pool[ip_pool_size].assigned = 0;
3351 ++ip_pool_size;
3352 if (ip_pool_size >= MAXIPPOOL)
3353 {
3354 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
3355 return;
3356 }
3357 }
3358 }
3359
3360 // Initialize the IP address pool
3361 static void initippool()
3362 {
3363 FILE *f;
3364 char *p;
3365 char buf[4096];
3366 memset(ip_address_pool, 0, sizeof(ip_address_pool));
3367
3368 if (!(f = fopen(IPPOOLFILE, "r")))
3369 {
3370 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
3371 exit(1);
3372 }
3373
3374 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
3375 {
3376 char *pool = buf;
3377 buf[4095] = 0; // Force it to be zero terminated/
3378
3379 if (*buf == '#' || *buf == '\n')
3380 continue; // Skip comments / blank lines
3381 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
3382 if ((p = (char *)strchr(buf, ':')))
3383 {
3384 in_addr_t src;
3385 *p = '\0';
3386 src = inet_addr(buf);
3387 if (src == INADDR_NONE)
3388 {
3389 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
3390 exit(1);
3391 }
3392 // This entry is for a specific IP only
3393 if (src != config->bind_address)
3394 continue;
3395 *p = ':';
3396 pool = p+1;
3397 }
3398 if ((p = (char *)strchr(pool, '/')))
3399 {
3400 // It's a range
3401 int numbits = 0;
3402 in_addr_t start = 0, mask = 0;
3403
3404 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
3405 *p++ = 0;
3406 if (!*p || !(numbits = atoi(p)))
3407 {
3408 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
3409 continue;
3410 }
3411 start = ntohl(inet_addr(pool));
3412 mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
3413
3414 // Add a static route for this pool
3415 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3416 fmtaddr(htonl(start), 0), 32 + mask);
3417
3418 routeset(0, start, mask, 0, 1);
3419
3420 add_to_ip_pool(start, mask);
3421 }
3422 else
3423 {
3424 // It's a single ip address
3425 add_to_ip_pool(inet_addr(pool), 0);
3426 }
3427 }
3428 fclose(f);
3429 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
3430 }
3431
3432 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port)
3433 {
3434 struct sockaddr_in snoop_addr = {0};
3435 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
3436 return;
3437
3438 snoop_addr.sin_family = AF_INET;
3439 snoop_addr.sin_addr.s_addr = destination;
3440 snoop_addr.sin_port = ntohs(port);
3441
3442 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size,
3443 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
3444 htons(snoop_addr.sin_port));
3445
3446 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
3447 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
3448
3449 STAT(packets_snooped);
3450 }
3451
3452 static int dump_session(FILE **f, sessiont *s)
3453 {
3454 if (!s->opened || !s->ip || !(s->cin || s->cout) || !*s->user || s->walled_garden)
3455 return 1;
3456
3457 if (!*f)
3458 {
3459 char filename[1024];
3460 char timestr[64];
3461 time_t now = time(NULL);
3462
3463 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
3464 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
3465
3466 if (!(*f = fopen(filename, "w")))
3467 {
3468 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
3469 return 0;
3470 }
3471
3472 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
3473 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
3474 "# host: %s\n"
3475 "# time: %ld\n"
3476 "# uptime: %ld\n"
3477 "# format: username ip qos uptxoctets downrxoctets\n",
3478 hostname,
3479 now,
3480 now - basetime);
3481 }
3482
3483 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
3484 fprintf(*f, "%s %s %d %u %u\n",
3485 s->user, // username
3486 fmtaddr(htonl(s->ip), 0), // ip
3487 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
3488 (uint32_t) s->cin, // uptxoctets
3489 (uint32_t) s->cout); // downrxoctets
3490
3491 s->pin = s->cin = 0;
3492 s->pout = s->cout = 0;
3493
3494 return 1;
3495 }
3496
3497 static void dump_acct_info(int all)
3498 {
3499 int i;
3500 FILE *f = NULL;
3501
3502
3503 CSTAT(dump_acct_info);
3504
3505 if (shut_acct_n)
3506 {
3507 for (i = 0; i < shut_acct_n; i++)
3508 dump_session(&f, &shut_acct[i]);
3509
3510 shut_acct_n = 0;
3511 }
3512
3513 if (all)
3514 for (i = 1; i <= config->cluster_highest_sessionid; i++)
3515 dump_session(&f, &session[i]);
3516
3517 if (f)
3518 fclose(f);
3519 }
3520
3521 // Main program
3522 int main(int argc, char *argv[])
3523 {
3524 int i;
3525 int optdebug = 0;
3526 char *optconfig = CONFIGFILE;
3527
3528 time(&basetime); // start clock
3529
3530 // scan args
3531 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
3532 {
3533 switch (i)
3534 {
3535 case 'd':
3536 if (fork()) exit(0);
3537 setsid();
3538 freopen("/dev/null", "r", stdin);
3539 freopen("/dev/null", "w", stdout);
3540 freopen("/dev/null", "w", stderr);
3541 break;
3542 case 'v':
3543 optdebug++;
3544 break;
3545 case 'c':
3546 optconfig = optarg;
3547 break;
3548 case 'h':
3549 snprintf(hostname, sizeof(hostname), "%s", optarg);
3550 break;
3551 default:
3552 printf("Args are:\n"
3553 "\t-d\t\tDetach from terminal\n"
3554 "\t-c <file>\tConfig file\n"
3555 "\t-h <hostname>\tForce hostname\n"
3556 "\t-v\t\tDebug\n");
3557
3558 return (0);
3559 break;
3560 }
3561 }
3562
3563 // Start the timer routine off
3564 time(&time_now);
3565 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3566 signal(SIGALRM, sigalrm_handler);
3567 siginterrupt(SIGALRM, 0);
3568
3569 initplugins();
3570 initdata(optdebug, optconfig);
3571
3572 init_cli(hostname);
3573 read_config_file();
3574 init_tbf(config->num_tbfs);
3575
3576 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
3577 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3578 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3579 {
3580 struct rlimit rlim;
3581 rlim.rlim_cur = RLIM_INFINITY;
3582 rlim.rlim_max = RLIM_INFINITY;
3583 // Remove the maximum core size
3584 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
3585 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
3586
3587 // Make core dumps go to /tmp
3588 chdir("/tmp");
3589 }
3590
3591 if (config->scheduler_fifo)
3592 {
3593 int ret;
3594 struct sched_param params = {0};
3595 params.sched_priority = 1;
3596
3597 if (get_nprocs() < 2)
3598 {
3599 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3600 config->scheduler_fifo = 0;
3601 }
3602 else
3603 {
3604 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
3605 {
3606 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3607 }
3608 else
3609 {
3610 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
3611 config->scheduler_fifo = 0;
3612 }
3613 }
3614 }
3615
3616 /* Set up the cluster communications port. */
3617 if (cluster_init() < 0)
3618 exit(1);
3619
3620 #ifdef BGP
3621 signal(SIGPIPE, SIG_IGN);
3622 bgp_setup(config->as_number);
3623 bgp_add_route(config->bind_address, 0xffffffff);
3624 for (i = 0; i < BGP_NUM_PEERS; i++)
3625 {
3626 if (config->neighbour[i].name[0])
3627 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3628 config->neighbour[i].as, config->neighbour[i].keepalive,
3629 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3630 }
3631 #endif /* BGP */
3632
3633 inittun();
3634 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
3635
3636 initudp();
3637 initrad();
3638 initippool();
3639
3640 read_state();
3641
3642 signal(SIGHUP, sighup_handler);
3643 signal(SIGTERM, sigterm_handler);
3644 signal(SIGINT, sigterm_handler);
3645 signal(SIGQUIT, sigquit_handler);
3646 signal(SIGCHLD, sigchild_handler);
3647
3648 // Prevent us from getting paged out
3649 if (config->lock_pages)
3650 {
3651 if (!mlockall(MCL_CURRENT))
3652 LOG(1, 0, 0, "Locking pages into memory\n");
3653 else
3654 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
3655 }
3656
3657 alarm(1);
3658
3659 // Drop privileges here
3660 if (config->target_uid > 0 && geteuid() == 0)
3661 setuid(config->target_uid);
3662
3663 mainloop();
3664
3665 #ifdef BGP
3666 /* try to shut BGP down cleanly; with luck the sockets will be
3667 writable since we're out of the select */
3668 for (i = 0; i < BGP_NUM_PEERS; i++)
3669 if (bgp_peers[i].state == Established)
3670 bgp_stop(&bgp_peers[i]);
3671 #endif /* BGP */
3672
3673 /* remove plugins (so cleanup code gets run) */
3674 plugins_done();
3675
3676 // Remove the PID file if we wrote it
3677 if (config->wrote_pid && *config->pid_file == '/')
3678 unlink(config->pid_file);
3679
3680 /* kill CLI children */
3681 signal(SIGTERM, SIG_IGN);
3682 kill(0, SIGTERM);
3683 return 0;
3684 }
3685
3686 static void sighup_handler(int sig)
3687 {
3688 if (log_stream && log_stream != stderr)
3689 {
3690 fclose(log_stream);
3691 log_stream = NULL;
3692 }
3693
3694 read_config_file();
3695 }
3696
3697 static void sigalrm_handler(int sig)
3698 {
3699 // Log current traffic stats
3700
3701 snprintf(config->bandwidth, sizeof(config->bandwidth),
3702 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3703 (udp_rx / 1024.0 / 1024.0 * 8),
3704 (eth_tx / 1024.0 / 1024.0 * 8),
3705 (eth_rx / 1024.0 / 1024.0 * 8),
3706 (udp_tx / 1024.0 / 1024.0 * 8),
3707 ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
3708 udp_rx_pkt, eth_rx_pkt);
3709
3710 udp_tx = udp_rx = 0;
3711 udp_rx_pkt = eth_rx_pkt = 0;
3712 eth_tx = eth_rx = 0;
3713
3714 if (config->dump_speed)
3715 printf("%s\n", config->bandwidth);
3716
3717 // Update the internal time counter
3718 time(&time_now);
3719 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3720 alarm(1);
3721
3722 {
3723 // Run timer hooks
3724 struct param_timer p = { time_now };
3725 run_plugins(PLUGIN_TIMER, &p);
3726 }
3727
3728 }
3729
3730 static void sigterm_handler(int sig)
3731 {
3732 LOG(1, 0, 0, "Shutting down cleanly\n");
3733 if (config->save_state)
3734 dump_state();
3735
3736 main_quit++;
3737 }
3738
3739 static void sigquit_handler(int sig)
3740 {
3741 int i;
3742
3743 LOG(1, 0, 0, "Shutting down without saving sessions\n");
3744
3745 if (config->cluster_iam_master)
3746 {
3747 for (i = 1; i < MAXSESSION; i++)
3748 {
3749 if (session[i].opened)
3750 sessionkill(i, "L2TPNS Closing");
3751 }
3752 for (i = 1; i < MAXTUNNEL; i++)
3753 {
3754 if (tunnel[i].ip || tunnel[i].state)
3755 tunnelshutdown(i, "L2TPNS Closing");
3756 }
3757 }
3758
3759 main_quit++;
3760 }
3761
3762 static void sigchild_handler(int sig)
3763 {
3764 while (waitpid(-1, NULL, WNOHANG) > 0)
3765 ;
3766 }
3767
3768 static void read_state()
3769 {
3770 struct stat sb;
3771 int i;
3772 ippoolt itmp;
3773 FILE *f;
3774 char magic[sizeof(DUMP_MAGIC) - 1];
3775 uint32_t buf[2];
3776
3777 if (!config->save_state)
3778 {
3779 unlink(STATEFILE);
3780 return ;
3781 }
3782
3783 if (stat(STATEFILE, &sb) < 0)
3784 {
3785 unlink(STATEFILE);
3786 return ;
3787 }
3788
3789 if (sb.st_mtime < (time(NULL) - 60))
3790 {
3791 LOG(0, 0, 0, "State file is too old to read, ignoring\n");
3792 unlink(STATEFILE);
3793 return ;
3794 }
3795
3796 f = fopen(STATEFILE, "r");
3797 unlink(STATEFILE);
3798
3799 if (!f)
3800 {
3801 LOG(0, 0, 0, "Can't read state file: %s\n", strerror(errno));
3802 exit(1);
3803 }
3804
3805 if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic)))
3806 {
3807 LOG(0, 0, 0, "Bad state file magic\n");
3808 exit(1);
3809 }
3810
3811 LOG(1, 0, 0, "Reading state information\n");
3812 if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
3813 {
3814 LOG(0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
3815 exit(1);
3816 }
3817
3818 if (buf[0] > ip_pool_size)
3819 {
3820 LOG(0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf[0], ip_pool_size);
3821 exit(1);
3822 }
3823
3824 LOG(2, 0, 0, "Loading %u ip addresses\n", buf[0]);
3825 for (i = 0; i < buf[0]; i++)
3826 {
3827 if (fread(&itmp, sizeof(itmp), 1, f) != 1)
3828 {
3829 LOG(0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
3830 exit(1);
3831 }
3832
3833 if (itmp.address != ip_address_pool[i].address)
3834 {
3835 LOG(0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
3836 exit(1);
3837 }
3838
3839 memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
3840 }
3841
3842 if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt))
3843 {
3844 LOG(0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
3845 exit(1);
3846 }
3847
3848 LOG(2, 0, 0, "Loading %u tunnels\n", MAXTUNNEL);
3849 if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
3850 {
3851 LOG(0, 0, 0, "Error reading tunnel data from state file\n");
3852 exit(1);
3853 }
3854
3855 for (i = 0; i < MAXTUNNEL; i++)
3856 {
3857 tunnel[i].controlc = 0;
3858 tunnel[i].controls = NULL;
3859 tunnel[i].controle = NULL;
3860 if (*tunnel[i].hostname)
3861 LOG(3, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname);
3862 }
3863
3864 if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont))
3865 {
3866 LOG(0, 0, 0, "Error/mismatch reading session header from state file\n");
3867 exit(1);
3868 }
3869
3870 LOG(2, 0, 0, "Loading %u sessions\n", MAXSESSION);
3871 if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
3872 {
3873 LOG(0, 0, 0, "Error reading session data from state file\n");
3874 exit(1);
3875 }
3876
3877 for (i = 0; i < MAXSESSION; i++)
3878 {
3879 session[i].tbf_in = 0;
3880 session[i].tbf_out = 0;
3881 if (session[i].opened)
3882 {
3883 LOG(2, i, 0, "Loaded active session for user %s\n", session[i].user);
3884 if (session[i].ip)
3885 sessionsetup(session[i].tunnel, i);
3886 }
3887 }
3888
3889 fclose(f);
3890 LOG(0, 0, 0, "Loaded saved state information\n");
3891 }
3892
3893 static void dump_state()
3894 {
3895 FILE *f;
3896 uint32_t buf[2];
3897
3898 if (!config->save_state)
3899 return;
3900
3901 do
3902 {
3903 if (!(f = fopen(STATEFILE, "w")))
3904 break;
3905
3906 LOG(1, 0, 0, "Dumping state information\n");
3907
3908 if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1)
3909 break;
3910
3911 LOG(2, 0, 0, "Dumping %u ip addresses\n", ip_pool_size);
3912 buf[0] = ip_pool_size;
3913 buf[1] = sizeof(ippoolt);
3914 if (fwrite(buf, sizeof(buf), 1, f) != 1)
3915 break;
3916 if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size)
3917 break;
3918
3919 LOG(2, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL);
3920 buf[0] = MAXTUNNEL;
3921 buf[1] = sizeof(tunnelt);
3922 if (fwrite(buf, sizeof(buf), 1, f) != 1)
3923 break;
3924 if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
3925 break;
3926
3927 LOG(2, 0, 0, "Dumping %u sessions\n", MAXSESSION);
3928 buf[0] = MAXSESSION;
3929 buf[1] = sizeof(sessiont);
3930 if (fwrite(buf, sizeof(buf), 1, f) != 1)
3931 break;
3932 if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
3933 break;
3934
3935 if (fclose(f) == 0)
3936 return ; // OK
3937 }
3938 while (0);
3939
3940 LOG(0, 0, 0, "Can't write state information: %s\n", strerror(errno));
3941 unlink(STATEFILE);
3942 }
3943
3944 static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response)
3945 {
3946 MD5_CTX ctx;
3947 *challenge_response = NULL;
3948
3949 if (!*config->l2tpsecret)
3950 {
3951 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3952 return;
3953 }
3954
3955 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
3956
3957 *challenge_response = (char *)calloc(17, 1);
3958
3959 MD5Init(&ctx);
3960 MD5Update(&ctx, &id, 1);
3961 MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
3962 MD5Update(&ctx, challenge, challenge_length);
3963 MD5Final(*challenge_response, &ctx);
3964
3965 return;
3966 }
3967
3968 static int facility_value(char *name)
3969 {
3970 int i;
3971 for (i = 0; facilitynames[i].c_name; i++)
3972 {
3973 if (strcmp(facilitynames[i].c_name, name) == 0)
3974 return facilitynames[i].c_val;
3975 }
3976 return 0;
3977 }
3978
3979 static void update_config()
3980 {
3981 int i;
3982 char *p;
3983 static int timeout = 0;
3984 static int interval = 0;
3985
3986 // Update logging
3987 closelog();
3988 syslog_log = 0;
3989 if (log_stream)
3990 {
3991 fclose(log_stream);
3992 log_stream = NULL;
3993 }
3994
3995 if (*config->log_filename)
3996 {
3997 if (strstr(config->log_filename, "syslog:") == config->log_filename)
3998 {
3999 char *p = config->log_filename + 7;
4000 if (*p)
4001 {
4002 openlog("l2tpns", LOG_PID, facility_value(p));
4003 syslog_log = 1;
4004 }
4005 }
4006 else if (strchr(config->log_filename, '/') == config->log_filename)
4007 {
4008 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4009 {
4010 fseek(log_stream, 0, SEEK_END);
4011 setbuf(log_stream, NULL);
4012 }
4013 else
4014 {
4015 log_stream = stderr;
4016 setbuf(log_stream, NULL);
4017 }
4018 }
4019 }
4020 else
4021 {
4022 log_stream = stderr;
4023 setbuf(log_stream, NULL);
4024 }
4025
4026 // Update radius
4027 config->numradiusservers = 0;
4028 for (i = 0; i < MAXRADSERVER; i++)
4029 if (config->radiusserver[i])
4030 {
4031 config->numradiusservers++;
4032 // Set radius port: if not set, take the port from the
4033 // first radius server. For the first radius server,
4034 // take the #defined default value from l2tpns.h
4035
4036 // test twice, In case someone works with
4037 // a secondary radius server without defining
4038 // a primary one, this will work even then.
4039 if (i>0 && !config->radiusport[i])
4040 config->radiusport[i] = config->radiusport[i-1];
4041 if (!config->radiusport[i])
4042 config->radiusport[i] = RADPORT;
4043 }
4044
4045 if (!config->numradiusservers)
4046 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4047
4048 config->num_radfds = 2 << RADIUS_SHIFT;
4049
4050 // parse radius_authtypes_s
4051 config->radius_authtypes = config->radius_authprefer = 0;
4052 p = config->radius_authtypes_s;
4053 while (*p)
4054 {
4055 char *s = strpbrk(p, " \t,");
4056 int type = 0;
4057
4058 if (s)
4059 {
4060 *s++ = 0;
4061 while (*s == ' ' || *s == '\t')
4062 s++;
4063
4064 if (!*s)
4065 s = 0;
4066 }
4067
4068 if (!strncasecmp("chap", p, strlen(p)))
4069 type = AUTHCHAP;
4070 else if (!strncasecmp("pap", p, strlen(p)))
4071 type = AUTHPAP;
4072 else
4073 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"", p);
4074
4075 config->radius_authtypes |= type;
4076 if (!config->radius_authprefer)
4077 config->radius_authprefer = type;
4078 }
4079
4080 if (!config->radius_authtypes)
4081 {
4082 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4083 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4084 }
4085
4086 // normalise radius_authtypes_s
4087 if (config->radius_authprefer == AUTHPAP)
4088 {
4089 strcpy(config->radius_authtypes_s, "pap");
4090 if (config->radius_authtypes & AUTHCHAP)
4091 strcat(config->radius_authtypes_s, ", chap");
4092 }
4093 else
4094 {
4095 strcpy(config->radius_authtypes_s, "chap");
4096 if (config->radius_authtypes & AUTHPAP)
4097 strcat(config->radius_authtypes_s, ", pap");
4098 }
4099
4100 // re-initialise the random number source
4101 initrandom(config->random_device);
4102
4103 // Update plugins
4104 for (i = 0; i < MAXPLUGINS; i++)
4105 {
4106 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4107 continue;
4108
4109 if (*config->plugins[i])
4110 {
4111 // Plugin added
4112 add_plugin(config->plugins[i]);
4113 }
4114 else if (*config->old_plugins[i])
4115 {
4116 // Plugin removed
4117 remove_plugin(config->old_plugins[i]);
4118 }
4119 }
4120
4121 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
4122 if (!config->cleanup_interval) config->cleanup_interval = 10;
4123 if (!config->multi_read_count) config->multi_read_count = 10;
4124 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
4125 if (!*config->cluster_interface)
4126 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
4127
4128 if (!config->cluster_hb_interval)
4129 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
4130
4131 if (!config->cluster_hb_timeout)
4132 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
4133
4134 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
4135 {
4136 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4137 // late, ensure we're sufficiently larger than that
4138 int t = 4 * config->cluster_hb_interval + 11;
4139
4140 if (config->cluster_hb_timeout < t)
4141 {
4142 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
4143 config->cluster_hb_timeout = t;
4144 }
4145
4146 // Push timing changes to the slaves immediately if we're the master
4147 if (config->cluster_iam_master)
4148 cluster_heartbeat();
4149
4150 interval = config->cluster_hb_interval;
4151 timeout = config->cluster_hb_timeout;
4152 }
4153
4154 // Write PID file
4155 if (*config->pid_file == '/' && !config->wrote_pid)
4156 {
4157 FILE *f;
4158 if ((f = fopen(config->pid_file, "w")))
4159 {
4160 fprintf(f, "%d\n", getpid());
4161 fclose(f);
4162 config->wrote_pid = 1;
4163 }
4164 else
4165 {
4166 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
4167 }
4168 }
4169
4170 config->reload_config = 0;
4171 }
4172
4173 static void read_config_file()
4174 {
4175 FILE *f;
4176
4177 if (!config->config_file) return;
4178 if (!(f = fopen(config->config_file, "r")))
4179 {
4180 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
4181 return;
4182 }
4183
4184 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
4185 cli_do_file(f);
4186 LOG(3, 0, 0, "Done reading config file\n");
4187 fclose(f);
4188 update_config();
4189 }
4190
4191 int sessionsetup(tunnelidt t, sessionidt s)
4192 {
4193 // A session now exists, set it up
4194 in_addr_t ip;
4195 char *user;
4196 sessionidt i;
4197 int r;
4198
4199 CSTAT(sessionsetup);
4200
4201 LOG(3, s, t, "Doing session setup for session\n");
4202
4203 if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
4204 {
4205 assign_ip_address(s);
4206 if (!session[s].ip)
4207 {
4208 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
4209 sessionshutdown(s, "No IP addresses available");
4210 return 0;
4211 }
4212 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
4213 fmtaddr(htonl(session[s].ip), 0));
4214 }
4215
4216
4217 // Make sure this is right
4218 session[s].tunnel = t;
4219
4220 // zap old sessions with same IP and/or username
4221 // Don't kill gardened sessions - doing so leads to a DoS
4222 // from someone who doesn't need to know the password
4223 {
4224 ip = session[s].ip;
4225 user = session[s].user;
4226 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4227 {
4228 if (i == s) continue;
4229 if (ip == session[i].ip) sessionkill(i, "Duplicate IP address");
4230 if (!session[s].walled_garden && !session[i].walled_garden && strcasecmp(user, session[i].user) == 0)
4231 sessionkill(i, "Duplicate session for users");
4232 }
4233 }
4234
4235 {
4236 int routed = 0;
4237
4238 // Add the route for this session.
4239 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
4240 {
4241 if ((session[s].ip & session[s].route[r].mask) ==
4242 (session[s].route[r].ip & session[s].route[r].mask))
4243 routed++;
4244
4245 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
4246 }
4247
4248 // Static IPs need to be routed if not already
4249 // convered by a Framed-Route. Anything else is part
4250 // of the IP address pool and is already routed, it
4251 // just needs to be added to the IP cache.
4252 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4253 if (session[s].ip_pool_index == -1) // static ip
4254 {
4255 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
4256 }
4257 else
4258 cache_ipmap(session[s].ip, s);
4259 }
4260
4261 if (!session[s].unique_id)
4262 {
4263 // did this session just finish radius?
4264 LOG(3, s, t, "Sending initial IPCP to client\n");
4265 sendipcp(t, s);
4266 session[s].unique_id = ++last_id;
4267 }
4268
4269 // Run the plugin's against this new session.
4270 {
4271 struct param_new_session data = { &tunnel[t], &session[s] };
4272 run_plugins(PLUGIN_NEW_SESSION, &data);
4273 }
4274
4275 // Allocate TBFs if throttled
4276 if (session[s].throttle_in || session[s].throttle_out)
4277 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
4278
4279 session[s].last_packet = time_now;
4280
4281 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
4282 fmtaddr(htonl(session[s].ip), 0),
4283 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
4284
4285 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
4286
4287 return 1; // RADIUS OK and IP allocated, done...
4288 }
4289
4290 //
4291 // This session just got dropped on us by the master or something.
4292 // Make sure our tables up up to date...
4293 //
4294 int load_session(sessionidt s, sessiont *new)
4295 {
4296 int i;
4297 int newip = 0;
4298
4299 // Sanity checks.
4300 if (new->ip_pool_index >= MAXIPPOOL ||
4301 new->tunnel >= MAXTUNNEL)
4302 {
4303 LOG(0, s, 0, "Strange session update received!\n");
4304 // FIXME! What to do here?
4305 return 0;
4306 }
4307
4308 //
4309 // Ok. All sanity checks passed. Now we're committed to
4310 // loading the new session.
4311 //
4312
4313 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
4314
4315 // See if routes/ip cache need updating
4316 if (new->ip != session[s].ip)
4317 newip++;
4318
4319 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
4320 if (new->route[i].ip != session[s].route[i].ip ||
4321 new->route[i].mask != session[s].route[i].mask)
4322 newip++;
4323
4324 // needs update
4325 if (newip)
4326 {
4327 int routed = 0;
4328
4329 // remove old routes...
4330 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
4331 {
4332 if ((session[s].ip & session[s].route[i].mask) ==
4333 (session[s].route[i].ip & session[s].route[i].mask))
4334 routed++;
4335
4336 routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
4337 }
4338
4339 // ...ip
4340 if (session[s].ip)
4341 {
4342 if (session[s].ip_pool_index == -1) // static IP
4343 {
4344 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
4345 }
4346 else // It's part of the IP pool, remove it manually.
4347 uncache_ipmap(session[s].ip);
4348 }
4349
4350 routed = 0;
4351
4352 // add new routes...
4353 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
4354 {
4355 if ((new->ip & new->route[i].mask) ==
4356 (new->route[i].ip & new->route[i].mask))
4357 routed++;
4358
4359 routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
4360 }
4361
4362 // ...ip
4363 if (new->ip)
4364 {
4365 // If there's a new one, add it.
4366 if (new->ip_pool_index == -1)
4367 {
4368 if (!routed) routeset(s, new->ip, 0, 0, 1);
4369 }
4370 else
4371 cache_ipmap(new->ip, s);
4372 }
4373 }
4374
4375 // check v6 routing
4376 if (new->flags & SF_IPV6_ROUTED && !(session[s].flags & SF_IPV6_ROUTED))
4377 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
4378
4379 // check filters
4380 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
4381 {
4382 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in);
4383 new->filter_in = 0;
4384 }
4385
4386 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
4387 {
4388 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out);
4389 new->filter_out = 0;
4390 }
4391
4392 if (new->filter_in != session[s].filter_in)
4393 {
4394 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
4395 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
4396 }
4397
4398 if (new->filter_out != session[s].filter_out)
4399 {
4400 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
4401 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
4402 }
4403
4404 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
4405 // for walking the sessions to forward byte counts to the master.
4406 config->cluster_highest_sessionid = s;
4407
4408 // TEMP: old session struct used a uint32_t to define the throttle
4409 // speed for both up/down, new uses a uint16_t for each. Deal with
4410 // sessions from an old master for migration.
4411 if (new->throttle_out == 0 && new->tbf_out)
4412 new->throttle_out = new->throttle_in;
4413
4414 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
4415
4416 // Do fixups into address pool.
4417 if (new->ip_pool_index != -1)
4418 fix_address_pool(s);
4419
4420 return 1;
4421 }
4422
4423 static void initplugins()
4424 {
4425 int i;
4426
4427 loaded_plugins = ll_init();
4428 // Initialize the plugins to nothing
4429 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
4430 plugins[i] = ll_init();
4431 }
4432
4433 static void *open_plugin(char *plugin_name, int load)
4434 {
4435 char path[256] = "";
4436
4437 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
4438 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
4439 return dlopen(path, RTLD_NOW);
4440 }
4441
4442 // plugin callback to get a config value
4443 static void *getconfig(char *key, enum config_typet type)
4444 {
4445 int i;
4446
4447 for (i = 0; config_values[i].key; i++)
4448 {
4449 if (!strcmp(config_values[i].key, key))
4450 {
4451 if (config_values[i].type == type)
4452 return ((void *) config) + config_values[i].offset;
4453
4454 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4455 key, type, config_values[i].type);
4456
4457 return 0;
4458 }
4459 }
4460
4461 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
4462 return 0;
4463 }
4464
4465 static int add_plugin(char *plugin_name)
4466 {
4467 static struct pluginfuncs funcs = {
4468 _log,
4469 _log_hex,
4470 fmtaddr,
4471 sessionbyuser,
4472 sessiontbysessionidt,
4473 sessionidtbysessiont,
4474 radiusnew,
4475 radiussend,
4476 getconfig,
4477 sessionkill,
4478 throttle_session,
4479 cluster_send_session,
4480 };
4481
4482 void *p = open_plugin(plugin_name, 1);
4483 int (*initfunc)(struct pluginfuncs *);
4484 int i;
4485
4486 if (!p)
4487 {
4488 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4489 return -1;
4490 }
4491
4492 if (ll_contains(loaded_plugins, p))
4493 {
4494 dlclose(p);
4495 return 0; // already loaded
4496 }
4497
4498 {
4499 int *v = dlsym(p, "plugin_api_version");
4500 if (!v || *v != PLUGIN_API_VERSION)
4501 {
4502 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4503 dlclose(p);
4504 return -1;
4505 }
4506 }
4507
4508 if ((initfunc = dlsym(p, "plugin_init")))
4509 {
4510 if (!initfunc(&funcs))
4511 {
4512 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4513 dlclose(p);
4514 return -1;
4515 }
4516 }
4517
4518 ll_push(loaded_plugins, p);
4519
4520 for (i = 0; i < max_plugin_functions; i++)
4521 {
4522 void *x;
4523 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
4524 {
4525 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
4526 ll_push(plugins[i], x);
4527 }
4528 }
4529
4530 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
4531 return 1;
4532 }
4533
4534 static void run_plugin_done(void *plugin)
4535 {
4536 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
4537
4538 if (donefunc)
4539 donefunc();
4540 }
4541
4542 static int remove_plugin(char *plugin_name)
4543 {
4544 void *p = open_plugin(plugin_name, 0);
4545 int loaded = 0;
4546
4547 if (!p)
4548 return -1;
4549
4550 if (ll_contains(loaded_plugins, p))
4551 {
4552 int i;
4553 for (i = 0; i < max_plugin_functions; i++)
4554 {
4555 void *x;
4556 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
4557 ll_delete(plugins[i], x);
4558 }
4559
4560 ll_delete(loaded_plugins, p);
4561 run_plugin_done(p);
4562 loaded = 1;
4563 }
4564
4565 dlclose(p);
4566 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
4567 return loaded;
4568 }
4569
4570 int run_plugins(int plugin_type, void *data)
4571 {
4572 int (*func)(void *data);
4573
4574 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
4575 return PLUGIN_RET_ERROR;
4576
4577 ll_reset(plugins[plugin_type]);
4578 while ((func = ll_next(plugins[plugin_type])))
4579 {
4580 int r = func(data);
4581
4582 if (r != PLUGIN_RET_OK)
4583 return r; // stop here
4584 }
4585
4586 return PLUGIN_RET_OK;
4587 }
4588
4589 static void plugins_done()
4590 {
4591 void *p;
4592
4593 ll_reset(loaded_plugins);
4594 while ((p = ll_next(loaded_plugins)))
4595 run_plugin_done(p);
4596 }
4597
4598 static void processcontrol(uint8_t * buf, int len, struct sockaddr_in *addr, int alen)
4599 {
4600 struct nsctl request;
4601 struct nsctl response;
4602 int type = unpack_control(&request, buf, len);
4603 int r;
4604 void *p;
4605
4606 if (log_stream && config->debug >= 4)
4607 {
4608 if (type < 0)
4609 {
4610 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4611 fmtaddr(addr->sin_addr.s_addr, 0), type);
4612 }
4613 else
4614 {
4615 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
4616 dump_control(&request, log_stream);
4617 }
4618 }
4619
4620 switch (type)
4621 {
4622 case NSCTL_REQ_LOAD:
4623 if (request.argc != 1)
4624 {
4625 response.type = NSCTL_RES_ERR;
4626 response.argc = 1;
4627 response.argv[0] = "name of plugin required";
4628 }
4629 else if ((r = add_plugin(request.argv[0])) < 1)
4630 {
4631 response.type = NSCTL_RES_ERR;
4632 response.argc = 1;
4633 response.argv[0] = !r
4634 ? "plugin already loaded"
4635 : "error loading plugin";
4636 }
4637 else
4638 {
4639 response.type = NSCTL_RES_OK;
4640 response.argc = 0;
4641 }
4642
4643 break;
4644
4645 case NSCTL_REQ_UNLOAD:
4646 if (request.argc != 1)
4647 {
4648 response.type = NSCTL_RES_ERR;
4649 response.argc = 1;
4650 response.argv[0] = "name of plugin required";
4651 }
4652 else if ((r = remove_plugin(request.argv[0])) < 1)
4653 {
4654 response.type = NSCTL_RES_ERR;
4655 response.argc = 1;
4656 response.argv[0] = !r
4657 ? "plugin not loaded"
4658 : "plugin not found";
4659 }
4660 else
4661 {
4662 response.type = NSCTL_RES_OK;
4663 response.argc = 0;
4664 }
4665
4666 break;
4667
4668 case NSCTL_REQ_HELP:
4669 response.type = NSCTL_RES_OK;
4670 response.argc = 0;
4671
4672 ll_reset(loaded_plugins);
4673 while ((p = ll_next(loaded_plugins)))
4674 {
4675 char **help = dlsym(p, "plugin_control_help");
4676 while (response.argc < 0xff && help && *help)
4677 response.argv[response.argc++] = *help++;
4678 }
4679
4680 break;
4681
4682 case NSCTL_REQ_CONTROL:
4683 {
4684 struct param_control param = {
4685 config->cluster_iam_master,
4686 request.argc,
4687 request.argv,
4688 0,
4689 NULL,
4690 };
4691
4692 int r = run_plugins(PLUGIN_CONTROL, &param);
4693
4694 if (r == PLUGIN_RET_ERROR)
4695 {
4696 response.type = NSCTL_RES_ERR;
4697 response.argc = 1;
4698 response.argv[0] = param.additional
4699 ? param.additional
4700 : "error returned by plugin";
4701 }
4702 else if (r == PLUGIN_RET_NOTMASTER)
4703 {
4704 static char msg[] = "must be run on master: 000.000.000.000";
4705
4706 response.type = NSCTL_RES_ERR;
4707 response.argc = 1;
4708 if (config->cluster_master_address)
4709 {
4710 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
4711 response.argv[0] = msg;
4712 }
4713 else
4714 {
4715 response.argv[0] = "must be run on master: none elected";
4716 }
4717 }
4718 else if (!(param.response & NSCTL_RESPONSE))
4719 {
4720 response.type = NSCTL_RES_ERR;
4721 response.argc = 1;
4722 response.argv[0] = param.response
4723 ? "unrecognised response value from plugin"
4724 : "unhandled action";
4725 }
4726 else
4727 {
4728 response.type = param.response;
4729 response.argc = 0;
4730 if (param.additional)
4731 {
4732 response.argc = 1;
4733 response.argv[0] = param.additional;
4734 }
4735 }
4736 }
4737
4738 break;
4739
4740 default:
4741 response.type = NSCTL_RES_ERR;
4742 response.argc = 1;
4743 response.argv[0] = "error unpacking control packet";
4744 }
4745
4746 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
4747 if (!buf)
4748 {
4749 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4750 return;
4751 }
4752
4753 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
4754 if (r > 0)
4755 {
4756 sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
4757 if (log_stream && config->debug >= 4)
4758 {
4759 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
4760 dump_control(&response, log_stream);
4761 }
4762 }
4763 else
4764 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4765 fmtaddr(addr->sin_addr.s_addr, 0), r);
4766
4767 free(buf);
4768 }
4769
4770 static tunnelidt new_tunnel()
4771 {
4772 tunnelidt i;
4773 for (i = 1; i < MAXTUNNEL; i++)
4774 {
4775 if (tunnel[i].state == TUNNELFREE)
4776 {
4777 LOG(4, 0, i, "Assigning tunnel ID %d\n", i);
4778 if (i > config->cluster_highest_tunnelid)
4779 config->cluster_highest_tunnelid = i;
4780 return i;
4781 }
4782 }
4783 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4784 return 0;
4785 }
4786
4787 //
4788 // We're becoming the master. Do any required setup..
4789 //
4790 // This is principally telling all the plugins that we're
4791 // now a master, and telling them about all the sessions
4792 // that are active too..
4793 //
4794 void become_master(void)
4795 {
4796 int s, i;
4797 run_plugins(PLUGIN_BECOME_MASTER, NULL);
4798
4799 // running a bunch of iptables commands is slow and can cause
4800 // the master to drop tunnels on takeover--kludge around the
4801 // problem by forking for the moment (note: race)
4802 if (!fork_and_close())
4803 {
4804 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
4805 {
4806 if (!session[s].tunnel) // Not an in-use session.
4807 continue;
4808
4809 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
4810 }
4811 exit(0);
4812 }
4813
4814 // add radius fds
4815 for (i = 0; i < config->num_radfds; i++)
4816 {
4817 FD_SET(radfds[i], &readset);
4818 if (radfds[i] > readset_n)
4819 readset_n = radfds[i];
4820 }
4821 }
4822
4823 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
4824 {
4825 int s, i;
4826 int count = 0;
4827 int buckets[64];
4828
4829 if (CLI_HELP_REQUESTED)
4830 return CLI_HELP_NO_ARGS;
4831
4832 time(&time_now);
4833 for (i = 0; i < 64;++i) buckets[i] = 0;
4834
4835 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
4836 {
4837 int idle;
4838 if (!session[s].tunnel)
4839 continue;
4840
4841 idle = time_now - session[s].last_packet;
4842 idle /= 5 ; // In multiples of 5 seconds.
4843 if (idle < 0)
4844 idle = 0;
4845 if (idle > 63)
4846 idle = 63;
4847
4848 ++count;
4849 ++buckets[idle];
4850 }
4851
4852 for (i = 0; i < 63; ++i)
4853 {
4854 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
4855 }
4856 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
4857 cli_print(cli, "%d total sessions open.", count);
4858 return CLI_OK;
4859 }
4860
4861 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
4862 {
4863 int s, i;
4864 int count = 0;
4865 int buckets[64];
4866
4867 if (CLI_HELP_REQUESTED)
4868 return CLI_HELP_NO_ARGS;
4869
4870 time(&time_now);
4871 for (i = 0; i < 64;++i) buckets[i] = 0;
4872
4873 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
4874 {
4875 int open = 0, d;
4876 if (!session[s].tunnel)
4877 continue;
4878
4879 d = time_now - session[s].opened;
4880 if (d < 0)
4881 d = 0;
4882 while (d > 1 && open < 32)
4883 {
4884 ++open;
4885 d >>= 1; // half.
4886 }
4887 ++count;
4888 ++buckets[open];
4889 }
4890
4891 s = 1;
4892 for (i = 0; i < 30; ++i)
4893 {
4894 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
4895 s <<= 1;
4896 }
4897 cli_print(cli, "%d total sessions open.", count);
4898 return CLI_OK;
4899 }
4900
4901 /* Unhide an avp.
4902 *
4903 * This unencodes the AVP using the L2TP CHAP secret and the
4904 * previously stored random vector. It replaces the hidden data with
4905 * the cleartext data and returns the length of the cleartext data
4906 * (including the AVP "header" of 6 bytes).
4907 *
4908 * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
4909 */
4910 static int unhide_avp(uint8_t *avp, tunnelidt t, sessionidt s, uint16_t length)
4911 {
4912 MD5_CTX ctx;
4913 uint8_t *cursor;
4914 uint8_t digest[16];
4915 uint8_t working_vector[16];
4916 uint16_t hidden_length;
4917 uint8_t type[2];
4918 size_t done, todo;
4919 uint8_t *output;
4920
4921 // Find the AVP type.
4922 type[0] = *(avp + 4);
4923 type[1] = *(avp + 5);
4924
4925 // Line up with the hidden data
4926 cursor = output = avp + 6;
4927
4928 // Compute initial pad
4929 MD5Init(&ctx);
4930 MD5Update(&ctx, type, 2);
4931 MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
4932 MD5Update(&ctx, session[s].random_vector, session[s].random_vector_length);
4933 MD5Final(digest, &ctx);
4934
4935 // Get hidden length
4936 hidden_length = ((uint16_t) (digest[0] ^ cursor[0])) * 256 + (uint16_t) (digest[1] ^ cursor[1]);
4937
4938 // Keep these for later use
4939 working_vector[0] = *cursor;
4940 working_vector[1] = *(cursor + 1);
4941 cursor += 2;
4942
4943 if (hidden_length > length - 8)
4944 {
4945 LOG(1, s, t, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length, (int) length);
4946 return 0;
4947 }
4948
4949 /* Decrypt remainder */
4950 done = 2;
4951 todo = hidden_length;
4952 while (todo)
4953 {
4954 working_vector[done] = *cursor;
4955 *output = digest[done] ^ *cursor;
4956 ++output;
4957 ++cursor;
4958 --todo;
4959 ++done;
4960 if (done == 16 && todo)
4961 {
4962 // Compute new digest
4963 done = 0;
4964 MD5Init(&ctx);
4965 MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
4966 MD5Update(&ctx, &working_vector, 16);
4967 MD5Final(digest, &ctx);
4968 }
4969 }
4970
4971 return hidden_length + 6;
4972 }
4973
4974 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
4975 {
4976 switch (p->op)
4977 {
4978 case FILTER_PORT_OP_EQ: return port == p->port;
4979 case FILTER_PORT_OP_NEQ: return port != p->port;
4980 case FILTER_PORT_OP_GT: return port > p->port;
4981 case FILTER_PORT_OP_LT: return port < p->port;
4982 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
4983 }
4984
4985 return 0;
4986 }
4987
4988 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
4989 {
4990 switch (op)
4991 {
4992 case FILTER_FLAG_OP_ANY:
4993 return (flags & sflags) || (~flags & cflags);
4994
4995 case FILTER_FLAG_OP_ALL:
4996 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
4997
4998 case FILTER_FLAG_OP_EST:
4999 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5000 }
5001
5002 return 0;
5003 }
5004
5005 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5006 {
5007 uint16_t frag_offset;
5008 uint8_t proto;
5009 in_addr_t src_ip;
5010 in_addr_t dst_ip;
5011 uint16_t src_port = 0;
5012 uint16_t dst_port = 0;
5013 uint8_t flags = 0;
5014 ip_filter_rulet *rule;
5015
5016 if (len < 20) // up to end of destination address
5017 return 0;
5018
5019 if ((*buf >> 4) != 4) // IPv4
5020 return 0;
5021
5022 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5023 proto = buf[9];
5024 src_ip = *(in_addr_t *) (buf + 12);
5025 dst_ip = *(in_addr_t *) (buf + 16);
5026
5027 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5028 {
5029 int l = (buf[0] & 0xf) * 4; // length of IP header
5030 if (len < l + 4) // ports
5031 return 0;
5032
5033 src_port = ntohs(*(uint16_t *) (buf + l));
5034 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5035 if (proto == IPPROTO_TCP)
5036 {
5037 if (len < l + 14) // flags
5038 return 0;
5039
5040 flags = buf[l + 13] & 0x3f;
5041 }
5042 }
5043
5044 for (rule = ip_filters[filter].rules; rule->action; rule++)
5045 {
5046 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5047 continue;
5048
5049 if (rule->src_wild != INADDR_BROADCAST &&
5050 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5051 continue;
5052
5053 if (rule->dst_wild != INADDR_BROADCAST &&
5054 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
5055 continue;
5056
5057 if (frag_offset)
5058 {
5059 if (!rule->frag || rule->action == FILTER_ACTION_DENY)
5060 continue;
5061 }
5062 else
5063 {
5064 if (rule->frag)
5065 continue;
5066
5067 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
5068 {
5069 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
5070 continue;
5071
5072 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
5073 continue;
5074
5075 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
5076 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
5077 continue;
5078 }
5079 }
5080
5081 // matched
5082 rule->counter++;
5083 return rule->action == FILTER_ACTION_PERMIT;
5084 }
5085
5086 // default deny
5087 return 0;
5088 }