110029a917fe76b924ef4464eb1e86c00859bbfe
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp $";
8
9 #include <arpa/inet.h>
10 #include <assert.h>
11 #include <errno.h>
12 #include <fcntl.h>
13 #include <linux/if_tun.h>
14 #define SYSLOG_NAMES
15 #include <syslog.h>
16 #include <malloc.h>
17 #include <math.h>
18 #include <net/route.h>
19 #include <sys/mman.h>
20 #include <netdb.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
23 #include <stdarg.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <ctype.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <sys/stat.h>
31 #include <sys/time.h>
32 #include <sys/resource.h>
33 #include <sys/wait.h>
34 #include <linux/if.h>
35 #include <stddef.h>
36 #include <time.h>
37 #include <dlfcn.h>
38 #include <unistd.h>
39 #include <sched.h>
40 #include <sys/sysinfo.h>
41 #include <libcli.h>
42 #include <linux/netlink.h>
43 #include <linux/rtnetlink.h>
44
45 #include "md5.h"
46 #include "l2tpns.h"
47 #include "cluster.h"
48 #include "plugin.h"
49 #include "ll.h"
50 #include "constants.h"
51 #include "control.h"
52 #include "util.h"
53 #include "tbf.h"
54
55 #ifdef BGP
56 #include "bgp.h"
57 #endif
58
59 // Globals
60 configt *config = NULL; // all configuration
61 int nlfd = -1; // netlink socket
62 int tunfd = -1; // tun interface file handle. (network device)
63 int udpfd = -1; // UDP file handle
64 int controlfd = -1; // Control signal handle
65 int clifd = -1; // Socket listening for CLI connections.
66 int daefd = -1; // Socket listening for DAE connections.
67 int snoopfd = -1; // UDP file handle for sending out intercept data
68 int *radfds = NULL; // RADIUS requests file handles
69 int rand_fd = -1; // Random data source
70 int cluster_sockfd = -1; // Intra-cluster communications socket.
71 int epollfd = -1; // event polling
72 time_t basetime = 0; // base clock
73 char hostname[1000] = ""; // us.
74 static int tunidx; // ifr_ifindex of tun device
75 int nlseqnum = 0; // netlink sequence number
76 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
77 static int syslog_log = 0; // are we logging to syslog
78 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
79 uint32_t last_id = 0; // Unique ID for radius accounting
80 // Guest change
81 char guest_users[10][32]; // Array of guest users
82 int guest_accounts_num = 0; // Number of guest users
83
84 // calculated from config->l2tp_mtu
85 uint16_t MRU = 0; // PPP MRU
86 uint16_t MSS = 0; // TCP MSS
87
88 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
89 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
90
91 union iphash {
92 sessionidt sess;
93 union iphash *idx;
94 } ip_hash[256]; // Mapping from IP address to session structures.
95
96 struct ipv6radix {
97 sessionidt sess;
98 struct ipv6radix *branch;
99 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
100
101 // Traffic counters.
102 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
103 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
104 uint32_t eth_tx = 0;
105
106 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
107 time_t time_now = 0; // Current time in seconds since epoch.
108 static char time_now_string[64] = {0}; // Current time as a string.
109 static int time_changed = 0; // time_now changed
110 char main_quit = 0; // True if we're in the process of exiting.
111 static char main_reload = 0; // Re-load pending
112 linked_list *loaded_plugins;
113 linked_list *plugins[MAX_PLUGIN_TYPES];
114
115 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
116 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
117
118 config_descriptt config_values[] = {
119 CONFIG("debug", debug, INT),
120 CONFIG("log_file", log_filename, STRING),
121 CONFIG("pid_file", pid_file, STRING),
122 CONFIG("random_device", random_device, STRING),
123 CONFIG("l2tp_secret", l2tp_secret, STRING),
124 CONFIG("l2tp_mtu", l2tp_mtu, INT),
125 CONFIG("ppp_restart_time", ppp_restart_time, INT),
126 CONFIG("ppp_max_configure", ppp_max_configure, INT),
127 CONFIG("ppp_max_failure", ppp_max_failure, INT),
128 CONFIG("primary_dns", default_dns1, IPv4),
129 CONFIG("secondary_dns", default_dns2, IPv4),
130 CONFIG("primary_radius", radiusserver[0], IPv4),
131 CONFIG("secondary_radius", radiusserver[1], IPv4),
132 CONFIG("primary_radius_port", radiusport[0], SHORT),
133 CONFIG("secondary_radius_port", radiusport[1], SHORT),
134 CONFIG("radius_accounting", radius_accounting, BOOL),
135 CONFIG("radius_interim", radius_interim, INT),
136 CONFIG("radius_secret", radiussecret, STRING),
137 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
138 CONFIG("radius_dae_port", radius_dae_port, SHORT),
139 CONFIG("radius_bind_min", radius_bind_min, SHORT),
140 CONFIG("radius_bind_max", radius_bind_max, SHORT),
141 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
142 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
143 CONFIG("guest_account", guest_user, STRING),
144 CONFIG("bind_address", bind_address, IPv4),
145 CONFIG("peer_address", peer_address, IPv4),
146 CONFIG("send_garp", send_garp, BOOL),
147 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
148 CONFIG("throttle_buckets", num_tbfs, INT),
149 CONFIG("accounting_dir", accounting_dir, STRING),
150 CONFIG("dump_speed", dump_speed, BOOL),
151 CONFIG("multi_read_count", multi_read_count, INT),
152 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
153 CONFIG("lock_pages", lock_pages, BOOL),
154 CONFIG("icmp_rate", icmp_rate, INT),
155 CONFIG("packet_limit", max_packets, INT),
156 CONFIG("cluster_address", cluster_address, IPv4),
157 CONFIG("cluster_interface", cluster_interface, STRING),
158 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
159 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
160 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
161 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
162 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
163 { NULL, 0, 0, 0 },
164 };
165
166 static char *plugin_functions[] = {
167 NULL,
168 "plugin_pre_auth",
169 "plugin_post_auth",
170 "plugin_packet_rx",
171 "plugin_packet_tx",
172 "plugin_timer",
173 "plugin_new_session",
174 "plugin_kill_session",
175 "plugin_control",
176 "plugin_radius_response",
177 "plugin_radius_reset",
178 "plugin_radius_account",
179 "plugin_become_master",
180 "plugin_new_session_master",
181 };
182
183 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
184
185 // Counters for shutdown sessions
186 static sessiont shut_acct[8192];
187 static sessionidt shut_acct_n = 0;
188
189 tunnelt *tunnel = NULL; // Array of tunnel structures.
190 bundlet *bundle = NULL; // Array of bundle structures.
191 fragmentationt *frag = NULL; // Array of fragmentation structures.
192 sessiont *session = NULL; // Array of session structures.
193 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
194 radiust *radius = NULL; // Array of radius structures.
195 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
196 ip_filtert *ip_filters = NULL; // Array of named filters.
197 static controlt *controlfree = 0;
198 struct Tstats *_statistics = NULL;
199 #ifdef RINGBUFFER
200 struct Tringbuffer *ringbuffer = NULL;
201 #endif
202
203 static ssize_t netlink_send(struct nlmsghdr *nh);
204 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
205 static void cache_ipmap(in_addr_t ip, sessionidt s);
206 static void uncache_ipmap(in_addr_t ip);
207 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
208 static void free_ip_address(sessionidt s);
209 static void dump_acct_info(int all);
210 static void sighup_handler(int sig);
211 static void shutdown_handler(int sig);
212 static void sigchild_handler(int sig);
213 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
214 static void update_config(void);
215 static void read_config_file(void);
216 static void initplugins(void);
217 static int add_plugin(char *plugin_name);
218 static int remove_plugin(char *plugin_name);
219 static void plugins_done(void);
220 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
221 static tunnelidt new_tunnel(void);
222 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
223 static void bundleclear(bundleidt b);
224
225 // on slaves, alow BGP to withdraw cleanly before exiting
226 #define QUIT_DELAY 5
227
228 // quit actions (master)
229 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
230 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
231
232 // return internal time (10ths since process startup), set f if given
233 // as a side-effect sets time_now, and time_changed
234 static clockt now(double *f)
235 {
236 struct timeval t;
237 gettimeofday(&t, 0);
238 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
239 if (t.tv_sec != time_now)
240 {
241 time_now = t.tv_sec;
242 time_changed++;
243 }
244 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
245 }
246
247 // work out a retry time based on try number
248 // This is a straight bounded exponential backoff.
249 // Maximum re-try time is 32 seconds. (2^5).
250 clockt backoff(uint8_t try)
251 {
252 if (try > 5) try = 5; // max backoff
253 return now(NULL) + 10 * (1 << try);
254 }
255
256
257 //
258 // Log a debug message. Typically called via the LOG macro
259 //
260 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
261 {
262 static char message[65536] = {0};
263 va_list ap;
264
265 #ifdef RINGBUFFER
266 if (ringbuffer)
267 {
268 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
269 ringbuffer->tail = 0;
270 if (ringbuffer->tail == ringbuffer->head)
271 if (++ringbuffer->head >= RINGBUFFER_SIZE)
272 ringbuffer->head = 0;
273
274 ringbuffer->buffer[ringbuffer->tail].level = level;
275 ringbuffer->buffer[ringbuffer->tail].session = s;
276 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
277 va_start(ap, format);
278 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
279 va_end(ap);
280 }
281 #endif
282
283 if (config->debug < level) return;
284
285 va_start(ap, format);
286 vsnprintf(message, sizeof(message), format, ap);
287
288 if (log_stream)
289 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
290 else if (syslog_log)
291 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
292
293 va_end(ap);
294 }
295
296 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
297 {
298 int i, j;
299 const uint8_t *d = data;
300
301 if (config->debug < level) return;
302
303 // No support for _log_hex to syslog
304 if (log_stream)
305 {
306 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
307 setvbuf(log_stream, NULL, _IOFBF, 16384);
308
309 for (i = 0; i < maxsize; )
310 {
311 fprintf(log_stream, "%4X: ", i);
312 for (j = i; j < maxsize && j < (i + 16); j++)
313 {
314 fprintf(log_stream, "%02X ", d[j]);
315 if (j == i + 7)
316 fputs(": ", log_stream);
317 }
318
319 for (; j < i + 16; j++)
320 {
321 fputs(" ", log_stream);
322 if (j == i + 7)
323 fputs(": ", log_stream);
324 }
325
326 fputs(" ", log_stream);
327 for (j = i; j < maxsize && j < (i + 16); j++)
328 {
329 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
330 fputc(d[j], log_stream);
331 else
332 fputc('.', log_stream);
333
334 if (j == i + 7)
335 fputs(" ", log_stream);
336 }
337
338 i = j;
339 fputs("\n", log_stream);
340 }
341
342 fflush(log_stream);
343 setbuf(log_stream, NULL);
344 }
345 }
346
347 // update a counter, accumulating 2^32 wraps
348 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
349 {
350 uint32_t new = *counter + delta;
351 if (new < *counter)
352 (*wrap)++;
353
354 *counter = new;
355 }
356
357 // initialise the random generator
358 static void initrandom(char *source)
359 {
360 static char path[sizeof(config->random_device)] = "*undefined*";
361
362 // reinitialise only if we are forced to do so or if the config has changed
363 if (source && !strncmp(path, source, sizeof(path)))
364 return;
365
366 // close previous source, if any
367 if (rand_fd >= 0)
368 close(rand_fd);
369
370 rand_fd = -1;
371
372 if (source)
373 {
374 // register changes
375 snprintf(path, sizeof(path), "%s", source);
376
377 if (*path == '/')
378 {
379 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
380 if (rand_fd < 0)
381 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
382 path, strerror(errno));
383 }
384 }
385 }
386
387 // fill buffer with random data
388 void random_data(uint8_t *buf, int len)
389 {
390 int n = 0;
391
392 CSTAT(random_data);
393 if (rand_fd >= 0)
394 {
395 n = read(rand_fd, buf, len);
396 if (n >= len) return;
397 if (n < 0)
398 {
399 if (errno != EAGAIN)
400 {
401 LOG(0, 0, 0, "Error reading from random source: %s\n",
402 strerror(errno));
403
404 // fall back to rand()
405 initrandom(NULL);
406 }
407
408 n = 0;
409 }
410 }
411
412 // append missing data
413 while (n < len)
414 // not using the low order bits from the prng stream
415 buf[n++] = (rand() >> 4) & 0xff;
416 }
417
418 // Add a route
419 //
420 // This adds it to the routing table, advertises it
421 // via BGP if enabled, and stuffs it into the
422 // 'sessionbyip' cache.
423 //
424 // 'ip' must be in _host_ order.
425 //
426 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
427 {
428 struct {
429 struct nlmsghdr nh;
430 struct rtmsg rt;
431 char buf[32];
432 } req;
433 int i;
434 in_addr_t n_ip;
435
436 if (!prefixlen) prefixlen = 32;
437
438 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
439
440 memset(&req, 0, sizeof(req));
441
442 if (add)
443 {
444 req.nh.nlmsg_type = RTM_NEWROUTE;
445 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
446 }
447 else
448 req.nh.nlmsg_type = RTM_DELROUTE;
449 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
450
451 req.rt.rtm_family = AF_INET;
452 req.rt.rtm_dst_len = prefixlen;
453 req.rt.rtm_table = RT_TABLE_MAIN;
454 req.rt.rtm_protocol = RTPROT_BOOT; // XXX
455 req.rt.rtm_scope = RT_SCOPE_LINK;
456 req.rt.rtm_type = RTN_UNICAST;
457
458 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
459 n_ip = htonl(ip);
460 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
461 if (gw)
462 {
463 n_ip = htonl(gw);
464 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
465 }
466
467 LOG(1, s, 0, "Route %s %s/%d%s%s\n", add ? "add" : "del",
468 fmtaddr(htonl(ip), 0), prefixlen,
469 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
470
471 if (netlink_send(&req.nh) < 0)
472 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
473
474 #ifdef BGP
475 if (add)
476 bgp_add_route(htonl(ip), prefixlen);
477 else
478 bgp_del_route(htonl(ip), prefixlen);
479 #endif /* BGP */
480
481 // Add/Remove the IPs to the 'sessionbyip' cache.
482 // Note that we add the zero address in the case of
483 // a network route. Roll on CIDR.
484
485 // Note that 's == 0' implies this is the address pool.
486 // We still cache it here, because it will pre-fill
487 // the malloc'ed tree.
488
489 if (s)
490 {
491 if (!add) // Are we deleting a route?
492 s = 0; // Caching the session as '0' is the same as uncaching.
493
494 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
495 cache_ipmap(i, s);
496 }
497 }
498
499 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
500 {
501 struct {
502 struct nlmsghdr nh;
503 struct rtmsg rt;
504 char buf[64];
505 } req;
506 int metric;
507 char ipv6addr[INET6_ADDRSTRLEN];
508
509 if (!config->ipv6_prefix.s6_addr[0])
510 {
511 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
512 return;
513 }
514
515 memset(&req, 0, sizeof(req));
516
517 if (add)
518 {
519 req.nh.nlmsg_type = RTM_NEWROUTE;
520 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
521 }
522 else
523 req.nh.nlmsg_type = RTM_DELROUTE;
524 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
525
526 req.rt.rtm_family = AF_INET6;
527 req.rt.rtm_dst_len = prefixlen;
528 req.rt.rtm_table = RT_TABLE_MAIN;
529 req.rt.rtm_protocol = RTPROT_BOOT; // XXX
530 req.rt.rtm_scope = RT_SCOPE_LINK;
531 req.rt.rtm_type = RTN_UNICAST;
532
533 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
534 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
535 metric = 1;
536 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
537
538 LOG(1, 0, 0, "Route %s %s/%d\n",
539 add ? "add" : "del",
540 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
541 prefixlen);
542
543 if (netlink_send(&req.nh) < 0)
544 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
545
546 // FIXME: need to add BGP routing (RFC2858)
547
548 if (s)
549 {
550 if (!add) // Are we deleting a route?
551 s = 0; // Caching the session as '0' is the same as uncaching.
552
553 cache_ipv6map(ip, prefixlen, s);
554 }
555
556 return;
557 }
558
559 //
560 // Set up netlink socket
561 static void initnetlink(void)
562 {
563 struct sockaddr_nl nladdr;
564
565 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
566 if (nlfd < 0)
567 {
568 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
569 exit(1);
570 }
571
572 memset(&nladdr, 0, sizeof(nladdr));
573 nladdr.nl_family = AF_NETLINK;
574 nladdr.nl_pid = getpid();
575
576 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
577 {
578 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
579 exit(1);
580 }
581 }
582
583 static ssize_t netlink_send(struct nlmsghdr *nh)
584 {
585 struct sockaddr_nl nladdr;
586 struct iovec iov;
587 struct msghdr msg;
588
589 nh->nlmsg_pid = getpid();
590 nh->nlmsg_seq = ++nlseqnum;
591
592 // set kernel address
593 memset(&nladdr, 0, sizeof(nladdr));
594 nladdr.nl_family = AF_NETLINK;
595
596 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
597 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
598
599 return sendmsg(nlfd, &msg, 0);
600 }
601
602 static ssize_t netlink_recv(void *buf, ssize_t len)
603 {
604 struct sockaddr_nl nladdr;
605 struct iovec iov;
606 struct msghdr msg;
607
608 // set kernel address
609 memset(&nladdr, 0, sizeof(nladdr));
610 nladdr.nl_family = AF_NETLINK;
611
612 iov = (struct iovec){ buf, len };
613 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
614
615 return recvmsg(nlfd, &msg, 0);
616 }
617
618 /* adapted from iproute2 */
619 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
620 {
621 int len = RTA_LENGTH(alen);
622 struct rtattr *rta;
623
624 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
625 rta->rta_type = type;
626 rta->rta_len = len;
627 memcpy(RTA_DATA(rta), data, alen);
628 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
629 }
630
631 // messages corresponding to different phases seq number
632 static char *tun_nl_phase_msg[] = {
633 "initialized",
634 "getting tun interface index",
635 "setting tun interface parameters",
636 "setting tun IPv4 address",
637 "setting tun LL IPv6 address",
638 "setting tun global IPv6 address",
639 };
640
641 //
642 // Set up TUN interface
643 static void inittun(void)
644 {
645 struct ifinfomsg ifinfo;
646 struct ifreq ifr;
647
648 memset(&ifr, 0, sizeof(ifr));
649 ifr.ifr_flags = IFF_TUN;
650
651 tunfd = open(TUNDEVICE, O_RDWR);
652 if (tunfd < 0)
653 { // fatal
654 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
655 exit(1);
656 }
657 {
658 int flags = fcntl(tunfd, F_GETFL, 0);
659 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
660 }
661 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
662 {
663 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
664 exit(1);
665 }
666 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
667 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
668
669 {
670 // get the interface index
671 struct {
672 struct nlmsghdr nh;
673 struct ifinfomsg ifinfo;
674 } req;
675 char buf[4096];
676 ssize_t len;
677 struct nlmsghdr *resp_nh;
678
679 req.nh.nlmsg_type = RTM_GETLINK;
680 req.nh.nlmsg_flags = NLM_F_REQUEST;
681 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
682
683 req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
684
685 netlink_addattr(&req.nh, IFLA_IFNAME, config->tundevice, strlen(config->tundevice)+1);
686
687 if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
688 {
689 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
690 exit(1);
691 }
692
693 resp_nh = (struct nlmsghdr *)buf;
694 if (!NLMSG_OK (resp_nh, len))
695 {
696 LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len);
697 exit(1);
698 }
699
700 memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
701 // got index
702 tunidx = ifinfo.ifi_index;
703 }
704 {
705 struct {
706 // interface setting
707 struct nlmsghdr nh;
708 union {
709 struct ifinfomsg ifinfo;
710 struct ifaddrmsg ifaddr;
711 } ifmsg;
712 char rtdata[32]; // 32 should be enough
713 } req;
714 uint32_t txqlen, mtu;
715 struct in_addr ip;
716
717 memset(&req, 0, sizeof(req));
718
719 req.nh.nlmsg_type = RTM_SETLINK;
720 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
721 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
722
723 req.ifmsg.ifinfo = ifinfo;
724 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
725 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
726
727 /* Bump up the qlen to deal with bursts from the network */
728 txqlen = 1000;
729 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
730 /* set MTU to modem MRU */
731 mtu = MRU;
732 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
733
734 if (netlink_send(&req.nh) < 0)
735 goto senderror;
736
737 memset(&req, 0, sizeof(req));
738
739 req.nh.nlmsg_type = RTM_NEWADDR;
740 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
741 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
742
743 req.ifmsg.ifaddr.ifa_family = AF_INET;
744 req.ifmsg.ifaddr.ifa_prefixlen = 32;
745 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
746
747 if (config->bind_address)
748 ip.s_addr = config->bind_address;
749 else
750 ip.s_addr = 0x01010101, // 1.1.1.1
751 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
752
753 if (netlink_send(&req.nh) < 0)
754 goto senderror;
755
756 // Only setup IPv6 on the tun device if we have a configured prefix
757 if (config->ipv6_prefix.s6_addr[0]) {
758 struct in6_addr ip6;
759
760 memset(&req, 0, sizeof(req));
761
762 req.nh.nlmsg_type = RTM_NEWADDR;
763 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
764 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
765
766 req.ifmsg.ifaddr.ifa_family = AF_INET6;
767 req.ifmsg.ifaddr.ifa_prefixlen = 64;
768 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
769 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
770
771 // Link local address is FE80::1
772 memset(&ip6, 0, sizeof(ip6));
773 ip6.s6_addr[0] = 0xFE;
774 ip6.s6_addr[1] = 0x80;
775 ip6.s6_addr[15] = 1;
776 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
777
778 if (netlink_send(&req.nh) < 0)
779 goto senderror;
780
781 memset(&req, 0, sizeof(req));
782
783 req.nh.nlmsg_type = RTM_NEWADDR;
784 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
785 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
786
787 req.ifmsg.ifaddr.ifa_family = AF_INET6;
788 req.ifmsg.ifaddr.ifa_prefixlen = 64;
789 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
790 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
791
792 // Global address is prefix::1
793 ip6 = config->ipv6_prefix;
794 ip6.s6_addr[15] = 1;
795 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
796
797 if (netlink_send(&req.nh) < 0)
798 goto senderror;
799 }
800
801 memset(&req, 0, sizeof(req));
802
803 req.nh.nlmsg_type = NLMSG_DONE;
804 req.nh.nlmsg_len = NLMSG_LENGTH(0);
805
806 if (netlink_send(&req.nh) < 0)
807 goto senderror;
808
809 // if we get an error for seqnum < min_initok_nlseqnum,
810 // we must exit as initialization went wrong
811 if (config->ipv6_prefix.s6_addr[0])
812 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
813 else
814 min_initok_nlseqnum = 3 + 1; // idx + if + addr
815 }
816
817 return;
818
819 senderror:
820 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
821 exit(1);
822 }
823
824 // set up UDP ports
825 static void initudp(void)
826 {
827 int on = 1;
828 struct sockaddr_in addr;
829
830 // Tunnel
831 memset(&addr, 0, sizeof(addr));
832 addr.sin_family = AF_INET;
833 addr.sin_port = htons(L2TPPORT);
834 addr.sin_addr.s_addr = config->bind_address;
835 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
836 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
837 {
838 int flags = fcntl(udpfd, F_GETFL, 0);
839 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
840 }
841 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
842 {
843 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
844 exit(1);
845 }
846
847 // Control
848 memset(&addr, 0, sizeof(addr));
849 addr.sin_family = AF_INET;
850 addr.sin_port = htons(NSCTL_PORT);
851 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
852 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
853 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
854 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
855 {
856 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
857 exit(1);
858 }
859
860 // Dynamic Authorization Extensions to RADIUS
861 memset(&addr, 0, sizeof(addr));
862 addr.sin_family = AF_INET;
863 addr.sin_port = htons(config->radius_dae_port);
864 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
865 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
866 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
867 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
868 {
869 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
870 exit(1);
871 }
872
873 // Intercept
874 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
875 }
876
877 //
878 // Find session by IP, < 1 for not found
879 //
880 // Confusingly enough, this 'ip' must be
881 // in _network_ order. This being the common
882 // case when looking it up from IP packet headers.
883 //
884 // We actually use this cache for two things.
885 // #1. For used IP addresses, this maps to the
886 // session ID that it's used by.
887 // #2. For un-used IP addresses, this maps to the
888 // index into the pool table that contains that
889 // IP address.
890 //
891
892 static sessionidt lookup_ipmap(in_addr_t ip)
893 {
894 uint8_t *a = (uint8_t *) &ip;
895 union iphash *h = ip_hash;
896
897 if (!(h = h[*a++].idx)) return 0;
898 if (!(h = h[*a++].idx)) return 0;
899 if (!(h = h[*a++].idx)) return 0;
900
901 return h[*a].sess;
902 }
903
904 static sessionidt lookup_ipv6map(struct in6_addr ip)
905 {
906 struct ipv6radix *curnode;
907 int i;
908 int s;
909 char ipv6addr[INET6_ADDRSTRLEN];
910
911 curnode = &ipv6_hash[ip.s6_addr[0]];
912 i = 1;
913 s = curnode->sess;
914
915 while (s == 0 && i < 15 && curnode->branch != NULL)
916 {
917 curnode = &curnode->branch[ip.s6_addr[i]];
918 s = curnode->sess;
919 i++;
920 }
921
922 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
923 inet_ntop(AF_INET6, &ip, ipv6addr,
924 INET6_ADDRSTRLEN),
925 s);
926
927 return s;
928 }
929
930 sessionidt sessionbyip(in_addr_t ip)
931 {
932 sessionidt s = lookup_ipmap(ip);
933 CSTAT(sessionbyip);
934
935 if (s > 0 && s < MAXSESSION && session[s].opened)
936 return s;
937
938 return 0;
939 }
940
941 sessionidt sessionbyipv6(struct in6_addr ip)
942 {
943 sessionidt s;
944 CSTAT(sessionbyipv6);
945
946 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
947 (ip.s6_addr[0] == 0xFE &&
948 ip.s6_addr[1] == 0x80 &&
949 ip.s6_addr16[1] == 0 &&
950 ip.s6_addr16[2] == 0 &&
951 ip.s6_addr16[3] == 0)) {
952 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
953 } else {
954 s = lookup_ipv6map(ip);
955 }
956
957 if (s > 0 && s < MAXSESSION && session[s].opened)
958 return s;
959
960 return 0;
961 }
962
963 //
964 // Take an IP address in HOST byte order and
965 // add it to the sessionid by IP cache.
966 //
967 // (It's actually cached in network order)
968 //
969 static void cache_ipmap(in_addr_t ip, sessionidt s)
970 {
971 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
972 uint8_t *a = (uint8_t *) &nip;
973 union iphash *h = ip_hash;
974 int i;
975
976 for (i = 0; i < 3; i++)
977 {
978 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
979 return;
980
981 h = h[a[i]].idx;
982 }
983
984 h[a[3]].sess = s;
985
986 if (s > 0)
987 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
988
989 else if (s == 0)
990 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
991 // else a map to an ip pool index.
992 }
993
994 static void uncache_ipmap(in_addr_t ip)
995 {
996 cache_ipmap(ip, 0); // Assign it to the NULL session.
997 }
998
999 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1000 {
1001 int i;
1002 int bytes;
1003 struct ipv6radix *curnode;
1004 char ipv6addr[INET6_ADDRSTRLEN];
1005
1006 curnode = &ipv6_hash[ip.s6_addr[0]];
1007
1008 bytes = prefixlen >> 3;
1009 i = 1;
1010 while (i < bytes) {
1011 if (curnode->branch == NULL)
1012 {
1013 if (!(curnode->branch = calloc(256,
1014 sizeof (struct ipv6radix))))
1015 return;
1016 }
1017 curnode = &curnode->branch[ip.s6_addr[i]];
1018 i++;
1019 }
1020
1021 curnode->sess = s;
1022
1023 if (s > 0)
1024 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1025 inet_ntop(AF_INET6, &ip, ipv6addr,
1026 INET6_ADDRSTRLEN),
1027 prefixlen);
1028 else if (s == 0)
1029 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1030 inet_ntop(AF_INET6, &ip, ipv6addr,
1031 INET6_ADDRSTRLEN),
1032 prefixlen);
1033 }
1034
1035 //
1036 // CLI list to dump current ipcache.
1037 //
1038 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1039 {
1040 union iphash *d = ip_hash, *e, *f, *g;
1041 int i, j, k, l;
1042 int count = 0;
1043
1044 if (CLI_HELP_REQUESTED)
1045 return CLI_HELP_NO_ARGS;
1046
1047 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1048
1049 for (i = 0; i < 256; ++i)
1050 {
1051 if (!d[i].idx)
1052 continue;
1053
1054 e = d[i].idx;
1055 for (j = 0; j < 256; ++j)
1056 {
1057 if (!e[j].idx)
1058 continue;
1059
1060 f = e[j].idx;
1061 for (k = 0; k < 256; ++k)
1062 {
1063 if (!f[k].idx)
1064 continue;
1065
1066 g = f[k].idx;
1067 for (l = 0; l < 256; ++l)
1068 {
1069 if (!g[l].sess)
1070 continue;
1071
1072 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1073 ++count;
1074 }
1075 }
1076 }
1077 }
1078 cli_print(cli, "%d entries in cache", count);
1079 return CLI_OK;
1080 }
1081
1082
1083 // Find session by username, 0 for not found
1084 // walled garden users aren't authenticated, so the username is
1085 // reasonably useless. Ignore them to avoid incorrect actions
1086 //
1087 // This is VERY inefficent. Don't call it often. :)
1088 //
1089 sessionidt sessionbyuser(char *username)
1090 {
1091 int s;
1092 CSTAT(sessionbyuser);
1093
1094 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1095 {
1096 if (!session[s].opened)
1097 continue;
1098
1099 if (session[s].walled_garden)
1100 continue; // Skip walled garden users.
1101
1102 if (!strncmp(session[s].user, username, 128))
1103 return s;
1104
1105 }
1106 return 0; // Not found.
1107 }
1108
1109 void send_garp(in_addr_t ip)
1110 {
1111 int s;
1112 struct ifreq ifr;
1113 uint8_t mac[6];
1114
1115 s = socket(PF_INET, SOCK_DGRAM, 0);
1116 if (s < 0)
1117 {
1118 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1119 return;
1120 }
1121 memset(&ifr, 0, sizeof(ifr));
1122 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1123 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1124 {
1125 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1126 close(s);
1127 return;
1128 }
1129 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1130 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1131 {
1132 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1133 close(s);
1134 return;
1135 }
1136 close(s);
1137 sendarp(ifr.ifr_ifindex, mac, ip);
1138 }
1139
1140 static sessiont *sessiontbysessionidt(sessionidt s)
1141 {
1142 if (!s || s >= MAXSESSION) return NULL;
1143 return &session[s];
1144 }
1145
1146 static sessionidt sessionidtbysessiont(sessiont *s)
1147 {
1148 sessionidt val = s-session;
1149 if (s < session || val >= MAXSESSION) return 0;
1150 return val;
1151 }
1152
1153 // actually send a control message for a specific tunnel
1154 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1155 {
1156 struct sockaddr_in addr;
1157
1158 CSTAT(tunnelsend);
1159
1160 if (!t)
1161 {
1162 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1163 STAT(tunnel_tx_errors);
1164 return;
1165 }
1166
1167 if (!tunnel[t].ip)
1168 {
1169 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1170 STAT(tunnel_tx_errors);
1171 return;
1172 }
1173
1174 memset(&addr, 0, sizeof(addr));
1175 addr.sin_family = AF_INET;
1176 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1177 addr.sin_port = htons(tunnel[t].port);
1178
1179 // sequence expected, if sequence in message
1180 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1181
1182 // If this is a control message, deal with retries
1183 if (*buf & 0x80)
1184 {
1185 tunnel[t].last = time_now; // control message sent
1186 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1187 if (tunnel[t].try)
1188 {
1189 STAT(tunnel_retries);
1190 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1191 }
1192 }
1193
1194 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1195 {
1196 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1197 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1198 STAT(tunnel_tx_errors);
1199 return;
1200 }
1201
1202 LOG_HEX(5, "Send Tunnel Data", buf, l);
1203 STAT(tunnel_tx_packets);
1204 INC_STAT(tunnel_tx_bytes, l);
1205 }
1206
1207 //
1208 // Tiny helper function to write data to
1209 // the 'tun' device.
1210 //
1211 int tun_write(uint8_t * data, int size)
1212 {
1213 return write(tunfd, data, size);
1214 }
1215
1216 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1217 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1218 {
1219 int d = (tcp[12] >> 4) * 4;
1220 uint8_t *mss = 0;
1221 uint8_t *opts;
1222 uint8_t *data;
1223 uint16_t orig;
1224 uint32_t sum;
1225
1226 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1227 return;
1228
1229 if (tcp + d > buf + len) // short?
1230 return;
1231
1232 opts = tcp + 20;
1233 data = tcp + d;
1234
1235 while (opts < data)
1236 {
1237 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1238 {
1239 mss = opts + 2;
1240 if (mss + 2 > data) return; // short?
1241 break;
1242 }
1243
1244 if (*opts == 0) return; // end of options
1245 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1246 opts++;
1247 else
1248 opts += opts[1]; // skip over option
1249 }
1250
1251 if (!mss) return; // not found
1252 orig = ntohs(*(uint16_t *) mss);
1253
1254 if (orig <= MSS) return; // mss OK
1255
1256 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1257 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1258 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1259 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1260
1261 // set mss
1262 *(int16_t *) mss = htons(MSS);
1263
1264 // adjust checksum (see rfc1141)
1265 sum = orig + (~MSS & 0xffff);
1266 sum += ntohs(*(uint16_t *) (tcp + 16));
1267 sum = (sum & 0xffff) + (sum >> 16);
1268 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1269 }
1270
1271 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1272 {
1273 uint16_t proto;
1274 if (extra) {
1275 // Skip the four extra bytes
1276 p += 4;
1277 l -= 4;
1278 }
1279
1280 if (*p & 1)
1281 {
1282 proto = *p++;
1283 l--;
1284 }
1285 else
1286 {
1287 proto = ntohs(*(uint16_t *) p);
1288 p += 2;
1289 l -= 2;
1290 }
1291 if (proto == PPPIP)
1292 {
1293 if (session[s].die)
1294 {
1295 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1296 return; // closing session, PPP not processed
1297 }
1298 session[s].last_packet = session[s].last_data = time_now;
1299 processipin(s, t, p, l);
1300 }
1301 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1302 {
1303 if (session[s].die)
1304 {
1305 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1306 return; // closing session, PPP not processed
1307 }
1308
1309 session[s].last_packet = session[s].last_data = time_now;
1310 processipv6in(s, t, p, l);
1311 }
1312 else if (proto == PPPIPCP)
1313 {
1314 session[s].last_packet = session[s].last_data = time_now;
1315 processipcp(s, t, p, l);
1316 }
1317 else if (proto == PPPCCP)
1318 {
1319 session[s].last_packet = session[s].last_data = time_now;
1320 processccp(s, t, p, l);
1321 }
1322 else
1323 {
1324 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1325 }
1326 }
1327
1328 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1329 {
1330 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1331 sp->cout_delta += len;
1332 sp->pout++;
1333 sp->last_data = time_now;
1334
1335 sess_local[s].cout += len; // To send to master..
1336 sess_local[s].pout++;
1337 }
1338
1339 // process outgoing (to tunnel) IP
1340 //
1341 static void processipout(uint8_t *buf, int len)
1342 {
1343 sessionidt s;
1344 sessiont *sp;
1345 tunnelidt t;
1346 in_addr_t ip;
1347
1348 uint8_t *data = buf; // Keep a copy of the originals.
1349 int size = len;
1350
1351 uint8_t fragbuf[MAXETHER + 20];
1352
1353 CSTAT(processipout);
1354
1355 if (len < MIN_IP_SIZE)
1356 {
1357 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1358 STAT(tun_rx_errors);
1359 return;
1360 }
1361 if (len >= MAXETHER)
1362 {
1363 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1364 STAT(tun_rx_errors);
1365 return;
1366 }
1367
1368 // Skip the tun header
1369 buf += 4;
1370 len -= 4;
1371
1372 // Got an IP header now
1373 if (*(uint8_t *)(buf) >> 4 != 4)
1374 {
1375 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1376 return;
1377 }
1378
1379 ip = *(uint32_t *)(buf + 16);
1380 if (!(s = sessionbyip(ip)))
1381 {
1382 // Is this a packet for a session that doesn't exist?
1383 static int rate = 0; // Number of ICMP packets we've sent this second.
1384 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1385
1386 if (last != time_now)
1387 {
1388 last = time_now;
1389 rate = 0;
1390 }
1391
1392 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1393 {
1394 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1395 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1396 config->bind_address ? config->bind_address : my_address, buf, len);
1397 }
1398 return;
1399 }
1400
1401 t = session[s].tunnel;
1402 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1403 {
1404 LOG(3, s, t, "Packet size more than session MRU\n");
1405 return;
1406 }
1407
1408 sp = &session[s];
1409
1410 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1411 if (config->max_packets > 0)
1412 {
1413 if (sess_local[s].last_packet_out == TIME)
1414 {
1415 int max = config->max_packets;
1416
1417 // All packets for throttled sessions are handled by the
1418 // master, so further limit by using the throttle rate.
1419 // A bit of a kludge, since throttle rate is in kbps,
1420 // but should still be generous given our average DSL
1421 // packet size is 200 bytes: a limit of 28kbps equates
1422 // to around 180 packets per second.
1423 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1424 max = sp->throttle_out;
1425
1426 if (++sess_local[s].packets_out > max)
1427 {
1428 sess_local[s].packets_dropped++;
1429 return;
1430 }
1431 }
1432 else
1433 {
1434 if (sess_local[s].packets_dropped)
1435 {
1436 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1437 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1438 sess_local[s].packets_dropped, sess_local[s].packets_out,
1439 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1440 sp->user);
1441 }
1442
1443 sess_local[s].last_packet_out = TIME;
1444 sess_local[s].packets_out = 1;
1445 sess_local[s].packets_dropped = 0;
1446 }
1447 }
1448
1449 // run access-list if any
1450 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1451 return;
1452
1453 // adjust MSS on SYN and SYN,ACK packets with options
1454 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1455 {
1456 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1457 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1458 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1459 }
1460
1461 if (sp->tbf_out)
1462 {
1463 // Are we throttling this session?
1464 if (config->cluster_iam_master)
1465 tbf_queue_packet(sp->tbf_out, data, size);
1466 else
1467 master_throttle_packet(sp->tbf_out, data, size);
1468 return;
1469 }
1470
1471 if (sp->walled_garden && !config->cluster_iam_master)
1472 {
1473 // We are walled-gardening this
1474 master_garden_packet(s, data, size);
1475 return;
1476 }
1477
1478 // Add on L2TP header
1479 {
1480 bundleidt bid = 0;
1481 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1482 {
1483 bid = session[s].bundle;
1484 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1485 t = session[s].tunnel;
1486 sp = &session[s];
1487 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1488 if(len > MINFRAGLEN)
1489 {
1490 // Partition the packet to "bundle[b].num_of_links" fragments
1491 bundlet *b = &bundle[bid];
1492 uint32_t num_of_links = b->num_of_links;
1493 uint32_t fraglen = len / num_of_links;
1494 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1495 uint32_t last_fraglen = fraglen + len % num_of_links;
1496 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1497 uint32_t remain = len;
1498
1499 // send the first packet
1500 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1501 if (!p) return;
1502 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1503 // statistics
1504 update_session_out_stat(s, sp, fraglen);
1505 remain -= fraglen;
1506 while (remain > last_fraglen)
1507 {
1508 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1509 t = session[s].tunnel;
1510 sp = &session[s];
1511 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1512 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1513 if (!p) return;
1514 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1515 update_session_out_stat(s, sp, fraglen);
1516 remain -= fraglen;
1517 }
1518 // send the last fragment
1519 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1520 t = session[s].tunnel;
1521 sp = &session[s];
1522 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1523 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1524 if (!p) return;
1525 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1526 update_session_out_stat(s, sp, remain);
1527 if (remain != last_fraglen)
1528 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1529 }
1530 else {
1531 // Send it as one frame
1532 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1533 if (!p) return;
1534 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1535 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1536 update_session_out_stat(s, sp, len);
1537 }
1538 }
1539 else
1540 {
1541 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1542 if (!p) return;
1543 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1544 update_session_out_stat(s, sp, len);
1545 }
1546 }
1547
1548 // Snooping this session, send it to intercept box
1549 if (sp->snoop_ip && sp->snoop_port)
1550 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1551
1552 udp_tx += len;
1553 }
1554
1555 // process outgoing (to tunnel) IPv6
1556 //
1557 static void processipv6out(uint8_t * buf, int len)
1558 {
1559 sessionidt s;
1560 sessiont *sp;
1561 tunnelidt t;
1562 in_addr_t ip;
1563 struct in6_addr ip6;
1564
1565 uint8_t *data = buf; // Keep a copy of the originals.
1566 int size = len;
1567
1568 uint8_t b[MAXETHER + 20];
1569
1570 CSTAT(processipv6out);
1571
1572 if (len < MIN_IP_SIZE)
1573 {
1574 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1575 STAT(tunnel_tx_errors);
1576 return;
1577 }
1578 if (len >= MAXETHER)
1579 {
1580 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1581 STAT(tunnel_tx_errors);
1582 return;
1583 }
1584
1585 // Skip the tun header
1586 buf += 4;
1587 len -= 4;
1588
1589 // Got an IP header now
1590 if (*(uint8_t *)(buf) >> 4 != 6)
1591 {
1592 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1593 return;
1594 }
1595
1596 ip6 = *(struct in6_addr *)(buf+24);
1597 s = sessionbyipv6(ip6);
1598
1599 if (s == 0)
1600 {
1601 ip = *(uint32_t *)(buf + 32);
1602 s = sessionbyip(ip);
1603 }
1604
1605 if (s == 0)
1606 {
1607 // Is this a packet for a session that doesn't exist?
1608 static int rate = 0; // Number of ICMP packets we've sent this second.
1609 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1610
1611 if (last != time_now)
1612 {
1613 last = time_now;
1614 rate = 0;
1615 }
1616
1617 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1618 {
1619 // FIXME: Should send icmp6 host unreachable
1620 }
1621 return;
1622 }
1623 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1624 {
1625 bundleidt bid = session[s].bundle;
1626 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1627 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1628 }
1629 t = session[s].tunnel;
1630 sp = &session[s];
1631 sp->last_data = time_now;
1632
1633 // FIXME: add DoS prevention/filters?
1634
1635 if (sp->tbf_out)
1636 {
1637 // Are we throttling this session?
1638 if (config->cluster_iam_master)
1639 tbf_queue_packet(sp->tbf_out, data, size);
1640 else
1641 master_throttle_packet(sp->tbf_out, data, size);
1642 return;
1643 }
1644 else if (sp->walled_garden && !config->cluster_iam_master)
1645 {
1646 // We are walled-gardening this
1647 master_garden_packet(s, data, size);
1648 return;
1649 }
1650
1651 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1652
1653 // Add on L2TP header
1654 {
1655 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1656 if (!p) return;
1657 tunnelsend(b, len + (p-b), t); // send it...
1658 }
1659
1660 // Snooping this session, send it to intercept box
1661 if (sp->snoop_ip && sp->snoop_port)
1662 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1663
1664 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1665 sp->cout_delta += len;
1666 sp->pout++;
1667 udp_tx += len;
1668
1669 sess_local[s].cout += len; // To send to master..
1670 sess_local[s].pout++;
1671 }
1672
1673 //
1674 // Helper routine for the TBF filters.
1675 // Used to send queued data in to the user!
1676 //
1677 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1678 {
1679 sessiont *sp;
1680 tunnelidt t;
1681 in_addr_t ip;
1682
1683 uint8_t b[MAXETHER + 20];
1684
1685 if (len < 0 || len > MAXETHER)
1686 {
1687 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1688 return;
1689 }
1690
1691 // Skip the tun header
1692 buf += 4;
1693 len -= 4;
1694
1695 ip = *(in_addr_t *)(buf + 16);
1696
1697 if (!session[s].ip)
1698 return;
1699
1700 t = session[s].tunnel;
1701 sp = &session[s];
1702
1703 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1704
1705 // Add on L2TP header
1706 {
1707 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1708 if (!p) return;
1709 tunnelsend(b, len + (p-b), t); // send it...
1710 }
1711
1712 // Snooping this session.
1713 if (sp->snoop_ip && sp->snoop_port)
1714 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1715
1716 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1717 sp->cout_delta += len;
1718 sp->pout++;
1719 udp_tx += len;
1720
1721 sess_local[s].cout += len; // To send to master..
1722 sess_local[s].pout++;
1723 }
1724
1725 // add an AVP (16 bit)
1726 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1727 {
1728 uint16_t l = (m ? 0x8008 : 0x0008);
1729 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1730 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1731 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1732 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1733 c->length += 8;
1734 }
1735
1736 // add an AVP (32 bit)
1737 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1738 {
1739 uint16_t l = (m ? 0x800A : 0x000A);
1740 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1741 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1742 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1743 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1744 c->length += 10;
1745 }
1746
1747 // add an AVP (string)
1748 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1749 {
1750 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1751 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1752 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1753 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1754 memcpy(c->buf + c->length + 6, val, strlen(val));
1755 c->length += 6 + strlen(val);
1756 }
1757
1758 // add a binary AVP
1759 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1760 {
1761 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1762 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1763 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1764 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1765 memcpy(c->buf + c->length + 6, val, len);
1766 c->length += 6 + len;
1767 }
1768
1769 // new control connection
1770 static controlt *controlnew(uint16_t mtype)
1771 {
1772 controlt *c;
1773 if (!controlfree)
1774 c = malloc(sizeof(controlt));
1775 else
1776 {
1777 c = controlfree;
1778 controlfree = c->next;
1779 }
1780 assert(c);
1781 c->next = 0;
1782 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1783 c->length = 12;
1784 control16(c, 0, mtype, 1);
1785 return c;
1786 }
1787
1788 // send zero block if nothing is waiting
1789 // (ZLB send).
1790 static void controlnull(tunnelidt t)
1791 {
1792 uint8_t buf[12];
1793 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1794 return;
1795
1796 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1797 *(uint16_t *) (buf + 2) = htons(12); // length
1798 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1799 *(uint16_t *) (buf + 6) = htons(0); // session
1800 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1801 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1802 tunnelsend(buf, 12, t);
1803 }
1804
1805 // add a control message to a tunnel, and send if within window
1806 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1807 {
1808 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1809 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1810 *(uint16_t *) (c->buf + 6) = htons(far); // session
1811 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1812 tunnel[t].ns++; // advance sequence
1813 // link in message in to queue
1814 if (tunnel[t].controlc)
1815 tunnel[t].controle->next = c;
1816 else
1817 tunnel[t].controls = c;
1818
1819 tunnel[t].controle = c;
1820 tunnel[t].controlc++;
1821
1822 // send now if space in window
1823 if (tunnel[t].controlc <= tunnel[t].window)
1824 {
1825 tunnel[t].try = 0; // first send
1826 tunnelsend(c->buf, c->length, t);
1827 }
1828 }
1829
1830 //
1831 // Throttle or Unthrottle a session
1832 //
1833 // Throttle the data from/to through a session to no more than
1834 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1835 // user).
1836 //
1837 // If either value is -1, the current value is retained for that
1838 // direction.
1839 //
1840 void throttle_session(sessionidt s, int rate_in, int rate_out)
1841 {
1842 if (!session[s].opened)
1843 return; // No-one home.
1844
1845 if (!*session[s].user)
1846 return; // User not logged in
1847
1848 if (rate_in >= 0)
1849 {
1850 int bytes = rate_in * 1024 / 8; // kbits to bytes
1851 if (session[s].tbf_in)
1852 free_tbf(session[s].tbf_in);
1853
1854 if (rate_in > 0)
1855 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1856 else
1857 session[s].tbf_in = 0;
1858
1859 session[s].throttle_in = rate_in;
1860 }
1861
1862 if (rate_out >= 0)
1863 {
1864 int bytes = rate_out * 1024 / 8;
1865 if (session[s].tbf_out)
1866 free_tbf(session[s].tbf_out);
1867
1868 if (rate_out > 0)
1869 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1870 else
1871 session[s].tbf_out = 0;
1872
1873 session[s].throttle_out = rate_out;
1874 }
1875 }
1876
1877 // add/remove filters from session (-1 = no change)
1878 void filter_session(sessionidt s, int filter_in, int filter_out)
1879 {
1880 if (!session[s].opened)
1881 return; // No-one home.
1882
1883 if (!*session[s].user)
1884 return; // User not logged in
1885
1886 // paranoia
1887 if (filter_in > MAXFILTER) filter_in = -1;
1888 if (filter_out > MAXFILTER) filter_out = -1;
1889 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1890 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1891
1892 if (filter_in >= 0)
1893 {
1894 if (session[s].filter_in)
1895 ip_filters[session[s].filter_in - 1].used--;
1896
1897 if (filter_in > 0)
1898 ip_filters[filter_in - 1].used++;
1899
1900 session[s].filter_in = filter_in;
1901 }
1902
1903 if (filter_out >= 0)
1904 {
1905 if (session[s].filter_out)
1906 ip_filters[session[s].filter_out - 1].used--;
1907
1908 if (filter_out > 0)
1909 ip_filters[filter_out - 1].used++;
1910
1911 session[s].filter_out = filter_out;
1912 }
1913 }
1914
1915 // start tidy shutdown of session
1916 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1917 {
1918 int walled_garden = session[s].walled_garden;
1919 bundleidt b = session[s].bundle;
1920 //delete routes only for last session in bundle (in case of MPPP)
1921 int del_routes = !b || (bundle[b].num_of_links == 1);
1922
1923 CSTAT(sessionshutdown);
1924
1925 if (!session[s].opened)
1926 {
1927 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1928 return; // not a live session
1929 }
1930
1931 if (!session[s].die)
1932 {
1933 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1934 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1935 run_plugins(PLUGIN_KILL_SESSION, &data);
1936 session[s].die = TIME + 150; // Clean up in 15 seconds
1937 }
1938
1939 if (session[s].ip && !walled_garden && !session[s].die)
1940 {
1941 // RADIUS Stop message
1942 uint16_t r = radiusnew(s);
1943 if (r)
1944 {
1945 // stop, if not already trying
1946 if (radius[r].state != RADIUSSTOP)
1947 {
1948 radius[r].term_cause = term_cause;
1949 radius[r].term_msg = reason;
1950 radiussend(r, RADIUSSTOP);
1951 }
1952 }
1953 else
1954 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1955
1956 // Save counters to dump to accounting file
1957 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1958 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1959 }
1960
1961 if (session[s].ip)
1962 { // IP allocated, clear and unroute
1963 int r;
1964 int routed = 0;
1965 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1966 {
1967 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
1968 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
1969 routed++;
1970
1971 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
1972 session[s].route[r].ip = 0;
1973 }
1974
1975 if (session[s].ip_pool_index == -1) // static ip
1976 {
1977 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1978 session[s].ip = 0;
1979 }
1980 else
1981 free_ip_address(s);
1982
1983 // unroute IPv6, if setup
1984 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1985 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1986
1987 if (b)
1988 {
1989 // This session was part of a bundle
1990 bundle[b].num_of_links--;
1991 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1992 if(bundle[b].num_of_links == 0)
1993 {
1994 bundleclear(b);
1995 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1996 }
1997 else
1998 {
1999 // Adjust the members array to accomodate the new change
2000 uint8_t mem_num = 0;
2001 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2002 if(bundle[b].members[bundle[b].num_of_links] != s)
2003 {
2004 uint8_t ml;
2005 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2006 if(bundle[b].members[ml] == s)
2007 {
2008 mem_num = ml;
2009 break;
2010 }
2011 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2012 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
2013 }
2014 }
2015 cluster_send_bundle(b);
2016 }
2017 }
2018
2019 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2020 throttle_session(s, 0, 0);
2021
2022 if (cdn_result)
2023 { // Send CDN
2024 controlt *c = controlnew(14); // sending CDN
2025 if (cdn_error)
2026 {
2027 uint8_t buf[4];
2028 *(uint16_t *) buf = htons(cdn_result);
2029 *(uint16_t *) (buf+2) = htons(cdn_error);
2030 controlb(c, 1, buf, 4, 1);
2031 }
2032 else
2033 control16(c, 1, cdn_result, 1);
2034
2035 control16(c, 14, s, 1); // assigned session (our end)
2036 controladd(c, session[s].far, session[s].tunnel); // send the message
2037 }
2038
2039 // update filter refcounts
2040 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2041 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2042
2043 // clear PPP state
2044 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2045 sess_local[s].lcp.restart = 0;
2046 sess_local[s].ipcp.restart = 0;
2047 sess_local[s].ipv6cp.restart = 0;
2048 sess_local[s].ccp.restart = 0;
2049
2050 cluster_send_session(s);
2051 }
2052
2053 void sendipcp(sessionidt s, tunnelidt t)
2054 {
2055 uint8_t buf[MAXETHER];
2056 uint8_t *q;
2057
2058 CSTAT(sendipcp);
2059 LOG(3, s, t, "IPCP: send ConfigReq\n");
2060
2061 if (!session[s].unique_id)
2062 {
2063 if (!++last_id) ++last_id; // skip zero
2064 session[s].unique_id = last_id;
2065 }
2066
2067 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2068 if (!q) return;
2069
2070 *q = ConfigReq;
2071 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2072 *(uint16_t *) (q + 2) = htons(10); // packet length
2073 q[4] = 3; // ip address option
2074 q[5] = 6; // option length
2075 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2076 config->bind_address ? config->bind_address :
2077 my_address; // send my IP
2078
2079 tunnelsend(buf, 10 + (q - buf), t); // send it
2080 restart_timer(s, ipcp);
2081 }
2082
2083 void sendipv6cp(sessionidt s, tunnelidt t)
2084 {
2085 uint8_t buf[MAXETHER];
2086 uint8_t *q;
2087
2088 CSTAT(sendipv6cp);
2089 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2090
2091 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2092 if (!q) return;
2093
2094 *q = ConfigReq;
2095 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2096 // only send one type
2097 // of request
2098 *(uint16_t *) (q + 2) = htons(14);
2099 q[4] = 1; // interface identifier option
2100 q[5] = 10; // option length
2101 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2102 *(uint32_t *) (q + 10) = 0;
2103 q[13] = 1;
2104
2105 tunnelsend(buf, 14 + (q - buf), t); // send it
2106 restart_timer(s, ipv6cp);
2107 }
2108
2109 static void sessionclear(sessionidt s)
2110 {
2111 memset(&session[s], 0, sizeof(session[s]));
2112 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2113 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2114
2115 session[s].tunnel = T_FREE; // Mark it as free.
2116 session[s].next = sessionfree;
2117 sessionfree = s;
2118 }
2119
2120 // kill a session now
2121 void sessionkill(sessionidt s, char *reason)
2122 {
2123 CSTAT(sessionkill);
2124
2125 if (!session[s].opened) // not alive
2126 return;
2127
2128 if (session[s].next)
2129 {
2130 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2131 return;
2132 }
2133
2134 if (!session[s].die)
2135 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2136
2137 if (sess_local[s].radius)
2138 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2139
2140 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2141 sessionclear(s);
2142 cluster_send_session(s);
2143 }
2144
2145 static void tunnelclear(tunnelidt t)
2146 {
2147 if (!t) return;
2148 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2149 tunnel[t].state = TUNNELFREE;
2150 }
2151
2152 static void bundleclear(bundleidt b)
2153 {
2154 if (!b) return;
2155 memset(&bundle[b], 0, sizeof(bundle[b]));
2156 bundle[b].state = BUNDLEFREE;
2157 }
2158
2159 // kill a tunnel now
2160 static void tunnelkill(tunnelidt t, char *reason)
2161 {
2162 sessionidt s;
2163 controlt *c;
2164
2165 CSTAT(tunnelkill);
2166
2167 tunnel[t].state = TUNNELDIE;
2168
2169 // free control messages
2170 while ((c = tunnel[t].controls))
2171 {
2172 controlt * n = c->next;
2173 tunnel[t].controls = n;
2174 tunnel[t].controlc--;
2175 c->next = controlfree;
2176 controlfree = c;
2177 }
2178 // kill sessions
2179 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2180 if (session[s].tunnel == t)
2181 sessionkill(s, reason);
2182
2183 // free tunnel
2184 tunnelclear(t);
2185 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2186 cli_tunnel_actions[t].action = 0;
2187 cluster_send_tunnel(t);
2188 }
2189
2190 // shut down a tunnel cleanly
2191 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2192 {
2193 sessionidt s;
2194
2195 CSTAT(tunnelshutdown);
2196
2197 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2198 {
2199 // never set up, can immediately kill
2200 tunnelkill(t, reason);
2201 return;
2202 }
2203 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2204
2205 // close session
2206 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2207 if (session[s].tunnel == t)
2208 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2209
2210 tunnel[t].state = TUNNELDIE;
2211 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2212 cluster_send_tunnel(t);
2213 // TBA - should we wait for sessions to stop?
2214 if (result)
2215 {
2216 controlt *c = controlnew(4); // sending StopCCN
2217 if (error)
2218 {
2219 uint8_t buf[64];
2220 int l = 4;
2221 *(uint16_t *) buf = htons(result);
2222 *(uint16_t *) (buf+2) = htons(error);
2223 if (msg)
2224 {
2225 int m = strlen(msg);
2226 if (m + 4 > sizeof(buf))
2227 m = sizeof(buf) - 4;
2228
2229 memcpy(buf+4, msg, m);
2230 l += m;
2231 }
2232
2233 controlb(c, 1, buf, l, 1);
2234 }
2235 else
2236 control16(c, 1, result, 1);
2237
2238 control16(c, 9, t, 1); // assigned tunnel (our end)
2239 controladd(c, 0, t); // send the message
2240 }
2241 }
2242
2243 // read and process packet on tunnel (UDP)
2244 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2245 {
2246 uint8_t *chapresponse = NULL;
2247 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2248 uint8_t *p = buf + 2;
2249
2250
2251 CSTAT(processudp);
2252
2253 udp_rx += len;
2254 udp_rx_pkt++;
2255 LOG_HEX(5, "UDP Data", buf, len);
2256 STAT(tunnel_rx_packets);
2257 INC_STAT(tunnel_rx_bytes, len);
2258 if (len < 6)
2259 {
2260 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2261 STAT(tunnel_rx_errors);
2262 return;
2263 }
2264 if ((buf[1] & 0x0F) != 2)
2265 {
2266 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2267 STAT(tunnel_rx_errors);
2268 return;
2269 }
2270 if (*buf & 0x40)
2271 { // length
2272 l = ntohs(*(uint16_t *) p);
2273 p += 2;
2274 }
2275 t = ntohs(*(uint16_t *) p);
2276 p += 2;
2277 s = ntohs(*(uint16_t *) p);
2278 p += 2;
2279 if (s >= MAXSESSION)
2280 {
2281 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2282 STAT(tunnel_rx_errors);
2283 return;
2284 }
2285 if (t >= MAXTUNNEL)
2286 {
2287 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2288 STAT(tunnel_rx_errors);
2289 return;
2290 }
2291 if (*buf & 0x08)
2292 { // ns/nr
2293 ns = ntohs(*(uint16_t *) p);
2294 p += 2;
2295 nr = ntohs(*(uint16_t *) p);
2296 p += 2;
2297 }
2298 if (*buf & 0x02)
2299 { // offset
2300 uint16_t o = ntohs(*(uint16_t *) p);
2301 p += o + 2;
2302 }
2303 if ((p - buf) > l)
2304 {
2305 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2306 STAT(tunnel_rx_errors);
2307 return;
2308 }
2309 l -= (p - buf);
2310
2311 // used to time out old tunnels
2312 if (t && tunnel[t].state == TUNNELOPEN)
2313 tunnel[t].lastrec = time_now;
2314
2315 if (*buf & 0x80)
2316 { // control
2317 uint16_t message = 0xFFFF; // message type
2318 uint8_t fatal = 0;
2319 uint8_t mandatory = 0;
2320 uint16_t asession = 0; // assigned session
2321 uint32_t amagic = 0; // magic number
2322 uint8_t aflags = 0; // flags from last LCF
2323 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2324 char called[MAXTEL] = ""; // called number
2325 char calling[MAXTEL] = ""; // calling number
2326
2327 if (!config->cluster_iam_master)
2328 {
2329 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2330 return;
2331 }
2332
2333 // control messages must have bits 0x80|0x40|0x08
2334 // (type, length and sequence) set, and bits 0x02|0x01
2335 // (offset and priority) clear
2336 if ((*buf & 0xCB) != 0xC8)
2337 {
2338 LOG(1, s, t, "Bad control header %02X\n", *buf);
2339 STAT(tunnel_rx_errors);
2340 return;
2341 }
2342
2343 // check for duplicate tunnel open message
2344 if (!t && ns == 0)
2345 {
2346 int i;
2347
2348 //
2349 // Is this a duplicate of the first packet? (SCCRQ)
2350 //
2351 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2352 {
2353 if (tunnel[i].state != TUNNELOPENING ||
2354 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2355 tunnel[i].port != ntohs(addr->sin_port) )
2356 continue;
2357 t = i;
2358 LOG(3, s, t, "Duplicate SCCRQ?\n");
2359 break;
2360 }
2361 }
2362
2363 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2364 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2365
2366 // if no tunnel specified, assign one
2367 if (!t)
2368 {
2369 if (!(t = new_tunnel()))
2370 {
2371 LOG(1, 0, 0, "No more tunnels\n");
2372 STAT(tunnel_overflow);
2373 return;
2374 }
2375 tunnelclear(t);
2376 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2377 tunnel[t].port = ntohs(addr->sin_port);
2378 tunnel[t].window = 4; // default window
2379 STAT(tunnel_created);
2380 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2381 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2382 }
2383
2384 // If the 'ns' just received is not the 'nr' we're
2385 // expecting, just send an ack and drop it.
2386 //
2387 // if 'ns' is less, then we got a retransmitted packet.
2388 // if 'ns' is greater than missed a packet. Either way
2389 // we should ignore it.
2390 if (ns != tunnel[t].nr)
2391 {
2392 // is this the sequence we were expecting?
2393 STAT(tunnel_rx_errors);
2394 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2395 t, ns, tunnel[t].nr);
2396
2397 if (l) // Is this not a ZLB?
2398 controlnull(t);
2399 return;
2400 }
2401
2402 // check sequence of this message
2403 {
2404 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2405 // some to clear maybe?
2406 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2407 {
2408 controlt *c = tunnel[t].controls;
2409 tunnel[t].controls = c->next;
2410 tunnel[t].controlc--;
2411 c->next = controlfree;
2412 controlfree = c;
2413 skip--;
2414 tunnel[t].try = 0; // we have progress
2415 }
2416
2417 // receiver advance (do here so quoted correctly in any sends below)
2418 if (l) tunnel[t].nr = (ns + 1);
2419 if (skip < 0) skip = 0;
2420 if (skip < tunnel[t].controlc)
2421 {
2422 // some control packets can now be sent that were previous stuck out of window
2423 int tosend = tunnel[t].window - skip;
2424 controlt *c = tunnel[t].controls;
2425 while (c && skip)
2426 {
2427 c = c->next;
2428 skip--;
2429 }
2430 while (c && tosend)
2431 {
2432 tunnel[t].try = 0; // first send
2433 tunnelsend(c->buf, c->length, t);
2434 c = c->next;
2435 tosend--;
2436 }
2437 }
2438 if (!tunnel[t].controlc)
2439 tunnel[t].retry = 0; // caught up
2440 }
2441 if (l)
2442 { // if not a null message
2443 int result = 0;
2444 int error = 0;
2445 char *msg = 0;
2446
2447 // Default disconnect cause/message on receipt of CDN. Set to
2448 // more specific value from attribute 1 (result code) or 46
2449 // (disconnect cause) if present below.
2450 int disc_cause_set = 0;
2451 int disc_cause = TERM_NAS_REQUEST;
2452 char const *disc_reason = "Closed (Received CDN).";
2453
2454 // process AVPs
2455 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2456 {
2457 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2458 uint8_t *b = p;
2459 uint8_t flags = *p;
2460 uint16_t mtype;
2461
2462 if (n > l)
2463 {
2464 LOG(1, s, t, "Invalid length in AVP\n");
2465 STAT(tunnel_rx_errors);
2466 return;
2467 }
2468 p += n; // next
2469 l -= n;
2470 if (flags & 0x3C) // reserved bits, should be clear
2471 {
2472 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2473 fatal = flags;
2474 result = 2; // general error
2475 error = 3; // reserved field non-zero
2476 msg = 0;
2477 continue; // next
2478 }
2479 b += 2;
2480 if (*(uint16_t *) (b))
2481 {
2482 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2483 fatal = flags;
2484 result = 2; // general error
2485 error = 6; // generic vendor-specific error
2486 msg = "unsupported vendor-specific";
2487 continue; // next
2488 }
2489 b += 2;
2490 mtype = ntohs(*(uint16_t *) (b));
2491 b += 2;
2492 n -= 6;
2493
2494 if (flags & 0x40)
2495 {
2496 uint16_t orig_len;
2497
2498 // handle hidden AVPs
2499 if (!*config->l2tp_secret)
2500 {
2501 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2502 fatal = flags;
2503 result = 2; // general error
2504 error = 6; // generic vendor-specific error
2505 msg = "secret not specified";
2506 continue;
2507 }
2508 if (!session[s].random_vector_length)
2509 {
2510 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2511 fatal = flags;
2512 result = 2; // general error
2513 error = 6; // generic
2514 msg = "no random vector";
2515 continue;
2516 }
2517 if (n < 8)
2518 {
2519 LOG(2, s, t, "Short hidden AVP.\n");
2520 fatal = flags;
2521 result = 2; // general error
2522 error = 2; // length is wrong
2523 msg = 0;
2524 continue;
2525 }
2526
2527 // Unhide the AVP
2528 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2529
2530 orig_len = ntohs(*(uint16_t *) b);
2531 if (orig_len > n + 2)
2532 {
2533 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2534 orig_len, n);
2535
2536 fatal = flags;
2537 result = 2; // general error
2538 error = 2; // length is wrong
2539 msg = 0;
2540 continue;
2541 }
2542
2543 b += 2;
2544 n = orig_len;
2545 }
2546
2547 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2548 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2549
2550 switch (mtype)
2551 {
2552 case 0: // message type
2553 message = ntohs(*(uint16_t *) b);
2554 mandatory = flags & 0x80;
2555 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2556 break;
2557 case 1: // result code
2558 {
2559 uint16_t rescode = ntohs(*(uint16_t *) b);
2560 char const *resdesc = "(unknown)";
2561 char const *errdesc = NULL;
2562 int cause = 0;
2563
2564 if (message == 4)
2565 { /* StopCCN */
2566 resdesc = l2tp_stopccn_result_code(rescode);
2567 cause = TERM_LOST_SERVICE;
2568 }
2569 else if (message == 14)
2570 { /* CDN */
2571 resdesc = l2tp_cdn_result_code(rescode);
2572 if (rescode == 1)
2573 cause = TERM_LOST_CARRIER;
2574 else
2575 cause = TERM_ADMIN_RESET;
2576 }
2577
2578 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2579 if (n >= 4)
2580 {
2581 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2582 errdesc = l2tp_error_code(errcode);
2583 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2584 }
2585 if (n > 4)
2586 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2587
2588 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2589 {
2590 disc_cause_set = mtype;
2591 disc_reason = errdesc ? errdesc : resdesc;
2592 disc_cause = cause;
2593 }
2594
2595 break;
2596 }
2597 break;
2598 case 2: // protocol version
2599 {
2600 version = ntohs(*(uint16_t *) (b));
2601 LOG(4, s, t, " Protocol version = %u\n", version);
2602 if (version && version != 0x0100)
2603 { // allow 0.0 and 1.0
2604 LOG(1, s, t, " Bad protocol version %04X\n", version);
2605 fatal = flags;
2606 result = 5; // unspported protocol version
2607 error = 0x0100; // supported version
2608 msg = 0;
2609 continue; // next
2610 }
2611 }
2612 break;
2613 case 3: // framing capabilities
2614 break;
2615 case 4: // bearer capabilities
2616 break;
2617 case 5: // tie breaker
2618 // We never open tunnels, so we don't care about tie breakers
2619 continue;
2620 case 6: // firmware revision
2621 break;
2622 case 7: // host name
2623 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2624 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2625 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2626 // TBA - to send to RADIUS
2627 break;
2628 case 8: // vendor name
2629 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2630 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2631 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2632 break;
2633 case 9: // assigned tunnel
2634 tunnel[t].far = ntohs(*(uint16_t *) (b));
2635 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2636 break;
2637 case 10: // rx window
2638 tunnel[t].window = ntohs(*(uint16_t *) (b));
2639 if (!tunnel[t].window)
2640 tunnel[t].window = 1; // window of 0 is silly
2641 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2642 break;
2643 case 11: // Challenge
2644 {
2645 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2646 build_chap_response(b, 2, n, &chapresponse);
2647 }
2648 break;
2649 case 13: // Response
2650 // Why did they send a response? We never challenge.
2651 LOG(2, s, t, " received unexpected challenge response\n");
2652 break;
2653
2654 case 14: // assigned session
2655 asession = session[s].far = ntohs(*(uint16_t *) (b));
2656 LOG(4, s, t, " assigned session = %u\n", asession);
2657 break;
2658 case 15: // call serial number
2659 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2660 break;
2661 case 18: // bearer type
2662 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2663 // TBA - for RADIUS
2664 break;
2665 case 19: // framing type
2666 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2667 // TBA
2668 break;
2669 case 21: // called number
2670 memset(called, 0, sizeof(called));
2671 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2672 LOG(4, s, t, " Called <%s>\n", called);
2673 break;
2674 case 22: // calling number
2675 memset(calling, 0, sizeof(calling));
2676 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2677 LOG(4, s, t, " Calling <%s>\n", calling);
2678 break;
2679 case 23: // subtype
2680 break;
2681 case 24: // tx connect speed
2682 if (n == 4)
2683 {
2684 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2685 }
2686 else
2687 {
2688 // AS5300s send connect speed as a string
2689 char tmp[30];
2690 memset(tmp, 0, sizeof(tmp));
2691 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2692 session[s].tx_connect_speed = atol(tmp);
2693 }
2694 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2695 break;
2696 case 38: // rx connect speed
2697 if (n == 4)
2698 {
2699 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2700 }
2701 else
2702 {
2703 // AS5300s send connect speed as a string
2704 char tmp[30];
2705 memset(tmp, 0, sizeof(tmp));
2706 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2707 session[s].rx_connect_speed = atol(tmp);
2708 }
2709 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2710 break;
2711 case 25: // Physical Channel ID
2712 {
2713 uint32_t tmp = ntohl(*(uint32_t *) b);
2714 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2715 break;
2716 }
2717 case 29: // Proxy Authentication Type
2718 {
2719 uint16_t atype = ntohs(*(uint16_t *)b);
2720 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2721 break;
2722 }
2723 case 30: // Proxy Authentication Name
2724 {
2725 char authname[64];
2726 memset(authname, 0, sizeof(authname));
2727 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2728 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2729 authname);
2730 break;
2731 }
2732 case 31: // Proxy Authentication Challenge
2733 {
2734 LOG(4, s, t, " Proxy Auth Challenge\n");
2735 break;
2736 }
2737 case 32: // Proxy Authentication ID
2738 {
2739 uint16_t authid = ntohs(*(uint16_t *)(b));
2740 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2741 break;
2742 }
2743 case 33: // Proxy Authentication Response
2744 LOG(4, s, t, " Proxy Auth Response\n");
2745 break;
2746 case 27: // last sent lcp
2747 { // find magic number
2748 uint8_t *p = b, *e = p + n;
2749 while (p + 1 < e && p[1] && p + p[1] <= e)
2750 {
2751 if (*p == 5 && p[1] == 6) // Magic-Number
2752 amagic = ntohl(*(uint32_t *) (p + 2));
2753 else if (*p == 7) // Protocol-Field-Compression
2754 aflags |= SESSION_PFC;
2755 else if (*p == 8) // Address-and-Control-Field-Compression
2756 aflags |= SESSION_ACFC;
2757 p += p[1];
2758 }
2759 }
2760 break;
2761 case 28: // last recv lcp confreq
2762 break;
2763 case 26: // Initial Received LCP CONFREQ
2764 break;
2765 case 39: // seq required - we control it as an LNS anyway...
2766 break;
2767 case 36: // Random Vector
2768 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2769 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2770 if (n > sizeof(session[s].random_vector))
2771 n = sizeof(session[s].random_vector);
2772 memcpy(session[s].random_vector, b, n);
2773 session[s].random_vector_length = n;
2774 break;
2775 case 46: // ppp disconnect cause
2776 if (n >= 5)
2777 {
2778 uint16_t code = ntohs(*(uint16_t *) b);
2779 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2780 uint8_t dir = *(b + 4);
2781
2782 LOG(4, s, t, " PPP disconnect cause "
2783 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2784 code, proto, dir, n - 5, b + 5);
2785
2786 disc_cause_set = mtype;
2787
2788 switch (code)
2789 {
2790 case 1: // admin disconnect
2791 disc_cause = TERM_ADMIN_RESET;
2792 disc_reason = "Administrative disconnect";
2793 break;
2794 case 3: // lcp terminate
2795 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2796 disc_cause = TERM_USER_REQUEST;
2797 disc_reason = "Normal disconnection";
2798 break;
2799 case 4: // compulsory encryption unavailable
2800 if (dir != 1) break; // 1=refused by peer, 2=local
2801 disc_cause = TERM_USER_ERROR;
2802 disc_reason = "Compulsory encryption refused";
2803 break;
2804 case 5: // lcp: fsm timeout
2805 disc_cause = TERM_PORT_ERROR;
2806 disc_reason = "LCP: FSM timeout";
2807 break;
2808 case 6: // lcp: no recognisable lcp packets received
2809 disc_cause = TERM_PORT_ERROR;
2810 disc_reason = "LCP: no recognisable LCP packets";
2811 break;
2812 case 7: // lcp: magic-no error (possibly looped back)
2813 disc_cause = TERM_PORT_ERROR;
2814 disc_reason = "LCP: magic-no error (possible loop)";
2815 break;
2816 case 8: // lcp: echo request timeout
2817 disc_cause = TERM_PORT_ERROR;
2818 disc_reason = "LCP: echo request timeout";
2819 break;
2820 case 13: // auth: fsm timeout
2821 disc_cause = TERM_SERVICE_UNAVAILABLE;
2822 disc_reason = "Authentication: FSM timeout";
2823 break;
2824 case 15: // auth: unacceptable auth protocol
2825 disc_cause = TERM_SERVICE_UNAVAILABLE;
2826 disc_reason = "Unacceptable authentication protocol";
2827 break;
2828 case 16: // auth: authentication failed
2829 disc_cause = TERM_SERVICE_UNAVAILABLE;
2830 disc_reason = "Authentication failed";
2831 break;
2832 case 17: // ncp: fsm timeout
2833 disc_cause = TERM_SERVICE_UNAVAILABLE;
2834 disc_reason = "NCP: FSM timeout";
2835 break;
2836 case 18: // ncp: no ncps available
2837 disc_cause = TERM_SERVICE_UNAVAILABLE;
2838 disc_reason = "NCP: no NCPs available";
2839 break;
2840 case 19: // ncp: failure to converge on acceptable address
2841 disc_cause = TERM_SERVICE_UNAVAILABLE;
2842 disc_reason = (dir == 1)
2843 ? "NCP: too many Configure-Naks received from peer"
2844 : "NCP: too many Configure-Naks sent to peer";
2845 break;
2846 case 20: // ncp: user not permitted to use any address
2847 disc_cause = TERM_SERVICE_UNAVAILABLE;
2848 disc_reason = (dir == 1)
2849 ? "NCP: local link address not acceptable to peer"
2850 : "NCP: remote link address not acceptable";
2851 break;
2852 }
2853 }
2854 break;
2855 default:
2856 {
2857 static char e[] = "unknown AVP 0xXXXX";
2858 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2859 fatal = flags;
2860 result = 2; // general error
2861 error = 8; // unknown mandatory AVP
2862 sprintf((msg = e) + 14, "%04x", mtype);
2863 continue; // next
2864 }
2865 }
2866 }
2867 // process message
2868 if (fatal & 0x80)
2869 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2870 else
2871 switch (message)
2872 {
2873 case 1: // SCCRQ - Start Control Connection Request
2874 tunnel[t].state = TUNNELOPENING;
2875 if (main_quit != QUIT_SHUTDOWN)
2876 {
2877 controlt *c = controlnew(2); // sending SCCRP
2878 control16(c, 2, version, 1); // protocol version
2879 control32(c, 3, 3, 1); // framing
2880 controls(c, 7, hostname, 1); // host name
2881 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2882 control16(c, 9, t, 1); // assigned tunnel
2883 controladd(c, 0, t); // send the resply
2884 }
2885 else
2886 {
2887 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2888 }
2889 break;
2890 case 2: // SCCRP
2891 tunnel[t].state = TUNNELOPEN;
2892 tunnel[t].lastrec = time_now;
2893 break;
2894 case 3: // SCCN
2895 tunnel[t].state = TUNNELOPEN;
2896 tunnel[t].lastrec = time_now;
2897 controlnull(t); // ack
2898 break;
2899 case 4: // StopCCN
2900 controlnull(t); // ack
2901 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2902 break;
2903 case 6: // HELLO
2904 controlnull(t); // simply ACK
2905 break;
2906 case 7: // OCRQ
2907 // TBA
2908 break;
2909 case 8: // OCRO
2910 // TBA
2911 break;
2912 case 9: // OCCN
2913 // TBA
2914 break;
2915 case 10: // ICRQ
2916 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2917 {
2918 controlt *c = controlnew(11); // ICRP
2919
2920 s = sessionfree;
2921 sessionfree = session[s].next;
2922 memset(&session[s], 0, sizeof(session[s]));
2923
2924 if (s > config->cluster_highest_sessionid)
2925 config->cluster_highest_sessionid = s;
2926
2927 session[s].opened = time_now;
2928 session[s].tunnel = t;
2929 session[s].far = asession;
2930 session[s].last_packet = session[s].last_data = time_now;
2931 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2932 control16(c, 14, s, 1); // assigned session
2933 controladd(c, asession, t); // send the reply
2934
2935 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2936 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2937
2938 session[s].ppp.phase = Establish;
2939 session[s].ppp.lcp = Starting;
2940
2941 STAT(session_created);
2942 break;
2943 }
2944
2945 {
2946 controlt *c = controlnew(14); // CDN
2947 if (!sessionfree)
2948 {
2949 STAT(session_overflow);
2950 LOG(1, 0, t, "No free sessions\n");
2951 control16(c, 1, 4, 0); // temporary lack of resources
2952 }
2953 else
2954 control16(c, 1, 2, 7); // shutting down, try another
2955
2956 controladd(c, asession, t); // send the message
2957 }
2958 return;
2959 case 11: // ICRP
2960 // TBA
2961 break;
2962 case 12: // ICCN
2963 if (amagic == 0) amagic = time_now;
2964 session[s].magic = amagic; // set magic number
2965 session[s].flags = aflags; // set flags received
2966 session[s].mru = PPPoE_MRU; // default
2967 controlnull(t); // ack
2968
2969 // start LCP
2970 sess_local[s].lcp_authtype = config->radius_authprefer;
2971 sess_local[s].ppp_mru = MRU;
2972
2973 // Set multilink options before sending initial LCP packet
2974 sess_local[s].mp_mrru = 1614;
2975 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2976
2977 sendlcp(s, t);
2978 change_state(s, lcp, RequestSent);
2979 break;
2980
2981 case 14: // CDN
2982 controlnull(t); // ack
2983 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2984 break;
2985 case 0xFFFF:
2986 LOG(1, s, t, "Missing message type\n");
2987 break;
2988 default:
2989 STAT(tunnel_rx_errors);
2990 if (mandatory)
2991 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2992 else
2993 LOG(1, s, t, "Unknown message type %u\n", message);
2994 break;
2995 }
2996 if (chapresponse) free(chapresponse);
2997 cluster_send_tunnel(t);
2998 }
2999 else
3000 {
3001 LOG(4, s, t, " Got a ZLB ack\n");
3002 }
3003 }
3004 else
3005 { // data
3006 uint16_t proto;
3007
3008 LOG_HEX(5, "Receive Tunnel Data", p, l);
3009 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3010 { // HDLC address header, discard
3011 p += 2;
3012 l -= 2;
3013 }
3014 if (l < 2)
3015 {
3016 LOG(1, s, t, "Short ppp length %d\n", l);
3017 STAT(tunnel_rx_errors);
3018 return;
3019 }
3020 if (*p & 1)
3021 {
3022 proto = *p++;
3023 l--;
3024 }
3025 else
3026 {
3027 proto = ntohs(*(uint16_t *) p);
3028 p += 2;
3029 l -= 2;
3030 }
3031
3032 if (s && !session[s].opened) // Is something wrong??
3033 {
3034 if (!config->cluster_iam_master)
3035 {
3036 // Pass it off to the master to deal with..
3037 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3038 return;
3039 }
3040
3041
3042 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3043 STAT(tunnel_rx_errors);
3044 return;
3045 }
3046
3047 if (proto == PPPPAP)
3048 {
3049 session[s].last_packet = time_now;
3050 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3051 processpap(s, t, p, l);
3052 }
3053 else if (proto == PPPCHAP)
3054 {
3055 session[s].last_packet = time_now;
3056 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3057 processchap(s, t, p, l);
3058 }
3059 else if (proto == PPPLCP)
3060 {
3061 session[s].last_packet = time_now;
3062 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3063 processlcp(s, t, p, l);
3064 }
3065 else if (proto == PPPIPCP)
3066 {
3067 session[s].last_packet = time_now;
3068 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3069 processipcp(s, t, p, l);
3070 }
3071 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3072 {
3073 session[s].last_packet = time_now;
3074 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3075 processipv6cp(s, t, p, l);
3076 }
3077 else if (proto == PPPCCP)
3078 {
3079 session[s].last_packet = time_now;
3080 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3081 processccp(s, t, p, l);
3082 }
3083 else if (proto == PPPIP)
3084 {
3085 if (session[s].die)
3086 {
3087 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3088 return; // closing session, PPP not processed
3089 }
3090
3091 session[s].last_packet = session[s].last_data = time_now;
3092 if (session[s].walled_garden && !config->cluster_iam_master)
3093 {
3094 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3095 return;
3096 }
3097
3098 processipin(s, t, p, l);
3099 }
3100 else if (proto == PPPMP)
3101 {
3102 if (session[s].die)
3103 {
3104 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3105 return; // closing session, PPP not processed
3106 }
3107
3108 session[s].last_packet = session[s].last_data = time_now;
3109 if (session[s].walled_garden && !config->cluster_iam_master)
3110 {
3111 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3112 return;
3113 }
3114
3115 processmpin(s, t, p, l);
3116 }
3117 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3118 {
3119 if (session[s].die)
3120 {
3121 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3122 return; // closing session, PPP not processed
3123 }
3124
3125 session[s].last_packet = session[s].last_data = time_now;
3126 if (session[s].walled_garden && !config->cluster_iam_master)
3127 {
3128 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3129 return;
3130 }
3131
3132 processipv6in(s, t, p, l);
3133 }
3134 else if (session[s].ppp.lcp == Opened)
3135 {
3136 session[s].last_packet = time_now;
3137 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3138 protoreject(s, t, p, l, proto);
3139 }
3140 else
3141 {
3142 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3143 proto, ppp_state(session[s].ppp.lcp));
3144 }
3145 }
3146 }
3147
3148 // read and process packet on tun
3149 static void processtun(uint8_t * buf, int len)
3150 {
3151 LOG_HEX(5, "Receive TUN Data", buf, len);
3152 STAT(tun_rx_packets);
3153 INC_STAT(tun_rx_bytes, len);
3154
3155 CSTAT(processtun);
3156
3157 eth_rx_pkt++;
3158 eth_rx += len;
3159 if (len < 22)
3160 {
3161 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3162 STAT(tun_rx_errors);
3163 return;
3164 }
3165
3166 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3167 processipout(buf, len);
3168 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3169 && config->ipv6_prefix.s6_addr[0])
3170 processipv6out(buf, len);
3171
3172 // Else discard.
3173 }
3174
3175 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3176 // that we look at the whole of the tunnel, radius and session tables
3177 // every second
3178 static void regular_cleanups(double period)
3179 {
3180 // Next tunnel, radius and session to check for actions on.
3181 static tunnelidt t = 0;
3182 static int r = 0;
3183 static sessionidt s = 0;
3184
3185 int t_actions = 0;
3186 int r_actions = 0;
3187 int s_actions = 0;
3188
3189 int t_slice;
3190 int r_slice;
3191 int s_slice;
3192
3193 int i;
3194 int a;
3195
3196 // divide up tables into slices based on the last run
3197 t_slice = config->cluster_highest_tunnelid * period;
3198 r_slice = (MAXRADIUS - 1) * period;
3199 s_slice = config->cluster_highest_sessionid * period;
3200
3201 if (t_slice < 1)
3202 t_slice = 1;
3203 else if (t_slice > config->cluster_highest_tunnelid)
3204 t_slice = config->cluster_highest_tunnelid;
3205
3206 if (r_slice < 1)
3207 r_slice = 1;
3208 else if (r_slice > (MAXRADIUS - 1))
3209 r_slice = MAXRADIUS - 1;
3210
3211 if (s_slice < 1)
3212 s_slice = 1;
3213 else if (s_slice > config->cluster_highest_sessionid)
3214 s_slice = config->cluster_highest_sessionid;
3215
3216 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3217
3218 for (i = 0; i < t_slice; i++)
3219 {
3220 t++;
3221 if (t > config->cluster_highest_tunnelid)
3222 t = 1;
3223
3224 // check for expired tunnels
3225 if (tunnel[t].die && tunnel[t].die <= TIME)
3226 {
3227 STAT(tunnel_timeout);
3228 tunnelkill(t, "Expired");
3229 t_actions++;
3230 continue;
3231 }
3232 // check for message resend
3233 if (tunnel[t].retry && tunnel[t].controlc)
3234 {
3235 // resend pending messages as timeout on reply
3236 if (tunnel[t].retry <= TIME)
3237 {
3238 controlt *c = tunnel[t].controls;
3239 uint16_t w = tunnel[t].window;
3240 tunnel[t].try++; // another try
3241 if (tunnel[t].try > 5)
3242 tunnelkill(t, "Timeout on control message"); // game over
3243 else
3244 while (c && w--)
3245 {
3246 tunnelsend(c->buf, c->length, t);
3247 c = c->next;
3248 }
3249
3250 t_actions++;
3251 }
3252 }
3253 // Send hello
3254 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3255 {
3256 controlt *c = controlnew(6); // sending HELLO
3257 controladd(c, 0, t); // send the message
3258 LOG(3, 0, t, "Sending HELLO message\n");
3259 t_actions++;
3260 }
3261
3262 // Check for tunnel changes requested from the CLI
3263 if ((a = cli_tunnel_actions[t].action))
3264 {
3265 cli_tunnel_actions[t].action = 0;
3266 if (a & CLI_TUN_KILL)
3267 {
3268 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3269 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3270 t_actions++;
3271 }
3272 }
3273 }
3274
3275 for (i = 0; i < r_slice; i++)
3276 {
3277 r++;
3278 if (r >= MAXRADIUS)
3279 r = 1;
3280
3281 if (!radius[r].state)
3282 continue;
3283
3284 if (radius[r].retry <= TIME)
3285 {
3286 radiusretry(r);
3287 r_actions++;
3288 }
3289 }
3290
3291 for (i = 0; i < s_slice; i++)
3292 {
3293 s++;
3294 if (s > config->cluster_highest_sessionid)
3295 s = 1;
3296
3297 if (!session[s].opened) // Session isn't in use
3298 continue;
3299
3300 // check for expired sessions
3301 if (session[s].die)
3302 {
3303 if (session[s].die <= TIME)
3304 {
3305 sessionkill(s, "Expired");
3306 s_actions++;
3307 }
3308 continue;
3309 }
3310
3311 // PPP timeouts
3312 if (sess_local[s].lcp.restart <= time_now)
3313 {
3314 int next_state = session[s].ppp.lcp;
3315 switch (session[s].ppp.lcp)
3316 {
3317 case RequestSent:
3318 case AckReceived:
3319 next_state = RequestSent;
3320
3321 case AckSent:
3322 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3323 {
3324 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3325 sendlcp(s, session[s].tunnel);
3326 change_state(s, lcp, next_state);
3327 }
3328 else
3329 {
3330 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3331 STAT(session_timeout);
3332 }
3333
3334 s_actions++;
3335 }
3336
3337 if (session[s].die)
3338 continue;
3339 }
3340
3341 if (sess_local[s].ipcp.restart <= time_now)
3342 {
3343 int next_state = session[s].ppp.ipcp;
3344 switch (session[s].ppp.ipcp)
3345 {
3346 case RequestSent:
3347 case AckReceived:
3348 next_state = RequestSent;
3349
3350 case AckSent:
3351 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3352 {
3353 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3354 sendipcp(s, session[s].tunnel);
3355 change_state(s, ipcp, next_state);
3356 }
3357 else
3358 {
3359 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3360 STAT(session_timeout);
3361 }
3362
3363 s_actions++;
3364 }
3365
3366 if (session[s].die)
3367 continue;
3368 }
3369
3370 if (sess_local[s].ipv6cp.restart <= time_now)
3371 {
3372 int next_state = session[s].ppp.ipv6cp;
3373 switch (session[s].ppp.ipv6cp)
3374 {
3375 case RequestSent:
3376 case AckReceived:
3377 next_state = RequestSent;
3378
3379 case AckSent:
3380 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3381 {
3382 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3383 sendipv6cp(s, session[s].tunnel);
3384 change_state(s, ipv6cp, next_state);
3385 }
3386 else
3387 {
3388 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3389 change_state(s, ipv6cp, Stopped);
3390 }
3391
3392 s_actions++;
3393 }
3394 }
3395
3396 if (sess_local[s].ccp.restart <= time_now)
3397 {
3398 int next_state = session[s].ppp.ccp;
3399 switch (session[s].ppp.ccp)
3400 {
3401 case RequestSent:
3402 case AckReceived:
3403 next_state = RequestSent;
3404
3405 case AckSent:
3406 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3407 {
3408 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3409 sendccp(s, session[s].tunnel);
3410 change_state(s, ccp, next_state);
3411 }
3412 else
3413 {
3414 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3415 change_state(s, ccp, Stopped);
3416 }
3417
3418 s_actions++;
3419 }
3420 }
3421
3422 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3423 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3424 {
3425 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3426 STAT(session_timeout);
3427 s_actions++;
3428 continue;
3429 }
3430
3431 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3432 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3433 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3434 {
3435 uint8_t b[MAXETHER];
3436
3437 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3438 if (!q) continue;
3439
3440 *q = EchoReq;
3441 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3442 *(uint16_t *)(q + 2) = htons(8); // Length
3443 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3444
3445 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3446 (int)(time_now - session[s].last_packet));
3447 tunnelsend(b, 24, session[s].tunnel); // send it
3448 sess_local[s].last_echo = time_now;
3449 s_actions++;
3450 }
3451
3452 // Drop sessions who have reached session_timeout seconds
3453 if (session[s].session_timeout)
3454 {
3455 bundleidt bid = session[s].bundle;
3456 if (bid)
3457 {
3458 if (time_now - bundle[bid].last_check >= 1)
3459 {
3460 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3461 bundle[bid].last_check = time_now;
3462 if (bundle[bid].online_time >= session[s].session_timeout)
3463 {
3464 int ses;
3465 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3466 {
3467 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3468 s_actions++;
3469 continue;
3470 }
3471 }
3472 }
3473 }
3474 else if (time_now - session[s].opened >= session[s].session_timeout)
3475 {
3476 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3477 s_actions++;
3478 continue;
3479 }
3480 }
3481
3482 // Drop sessions who have reached idle_timeout seconds
3483 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3484 {
3485 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3486 STAT(session_timeout);
3487 s_actions++;
3488 continue;
3489 }
3490
3491 // Check for actions requested from the CLI
3492 if ((a = cli_session_actions[s].action))
3493 {
3494 int send = 0;
3495
3496 cli_session_actions[s].action = 0;
3497 if (a & CLI_SESS_KILL)
3498 {
3499 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3500 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3501 a = 0; // dead, no need to check for other actions
3502 s_actions++;
3503 }
3504
3505 if (a & CLI_SESS_NOSNOOP)
3506 {
3507 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3508 session[s].snoop_ip = 0;
3509 session[s].snoop_port = 0;
3510 s_actions++;
3511 send++;
3512 }
3513 else if (a & CLI_SESS_SNOOP)
3514 {
3515 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3516 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3517 cli_session_actions[s].snoop_port);
3518
3519 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3520 session[s].snoop_port = cli_session_actions[s].snoop_port;
3521 s_actions++;
3522 send++;
3523 }
3524
3525 if (a & CLI_SESS_NOTHROTTLE)
3526 {
3527 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3528 throttle_session(s, 0, 0);
3529 s_actions++;
3530 send++;
3531 }
3532 else if (a & CLI_SESS_THROTTLE)
3533 {
3534 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3535 cli_session_actions[s].throttle_in,
3536 cli_session_actions[s].throttle_out);
3537
3538 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3539 s_actions++;
3540 send++;
3541 }
3542
3543 if (a & CLI_SESS_NOFILTER)
3544 {
3545 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3546 filter_session(s, 0, 0);
3547 s_actions++;
3548 send++;
3549 }
3550 else if (a & CLI_SESS_FILTER)
3551 {
3552 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3553 cli_session_actions[s].filter_in,
3554 cli_session_actions[s].filter_out);
3555
3556 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3557 s_actions++;
3558 send++;
3559 }
3560
3561 if (send)
3562 cluster_send_session(s);
3563 }
3564
3565 // RADIUS interim accounting
3566 if (config->radius_accounting && config->radius_interim > 0
3567 && session[s].ip && !session[s].walled_garden
3568 && !sess_local[s].radius // RADIUS already in progress
3569 && time_now - sess_local[s].last_interim >= config->radius_interim
3570 && session[s].flags & SESSION_STARTED)
3571 {
3572 int rad = radiusnew(s);
3573 if (!rad)
3574 {
3575 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3576 STAT(radius_overflow);
3577 continue;
3578 }
3579
3580 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3581 session[s].user, session[s].unique_id);
3582
3583 radiussend(rad, RADIUSINTERIM);
3584 sess_local[s].last_interim = time_now;
3585 s_actions++;
3586 }
3587 }
3588
3589 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3590 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3591 }
3592
3593 //
3594 // Are we in the middle of a tunnel update, or radius
3595 // requests??
3596 //
3597 static int still_busy(void)
3598 {
3599 int i;
3600 static clockt last_talked = 0;
3601 static clockt start_busy_wait = 0;
3602
3603 if (!config->cluster_iam_master)
3604 {
3605 #ifdef BGP
3606 static time_t stopped_bgp = 0;
3607 if (bgp_configured)
3608 {
3609 if (!stopped_bgp)
3610 {
3611 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3612
3613 for (i = 0; i < BGP_NUM_PEERS; i++)
3614 if (bgp_peers[i].state == Established)
3615 bgp_stop(&bgp_peers[i]);
3616
3617 stopped_bgp = time_now;
3618
3619 // we don't want to become master
3620 cluster_send_ping(0);
3621
3622 return 1;
3623 }
3624
3625 if (time_now < (stopped_bgp + QUIT_DELAY))
3626 return 1;
3627 }
3628 #endif /* BGP */
3629
3630 return 0;
3631 }
3632
3633 if (main_quit == QUIT_SHUTDOWN)
3634 {
3635 static int dropped = 0;
3636 if (!dropped)
3637 {
3638 int i;
3639
3640 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3641 for (i = 1; i < MAXTUNNEL; i++)
3642 if (tunnel[i].ip || tunnel[i].state)
3643 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3644
3645 dropped = 1;
3646 }
3647 }
3648
3649 if (start_busy_wait == 0)
3650 start_busy_wait = TIME;
3651
3652 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3653 {
3654 if (!tunnel[i].controlc)
3655 continue;
3656
3657 if (last_talked != TIME)
3658 {
3659 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3660 last_talked = TIME;
3661 }
3662 return 1;
3663 }
3664
3665 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3666 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3667 {
3668 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3669 return 0;
3670 }
3671
3672 for (i = 1; i < MAXRADIUS; i++)
3673 {
3674 if (radius[i].state == RADIUSNULL)
3675 continue;
3676 if (radius[i].state == RADIUSWAIT)
3677 continue;
3678
3679 if (last_talked != TIME)
3680 {
3681 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3682 last_talked = TIME;
3683 }
3684 return 1;
3685 }
3686
3687 return 0;
3688 }
3689
3690 #ifdef HAVE_EPOLL
3691 # include <sys/epoll.h>
3692 #else
3693 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3694 # include "fake_epoll.h"
3695 #endif
3696
3697 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3698 #define BASE_FDS 7
3699
3700 // additional polled fds
3701 #ifdef BGP
3702 # define EXTRA_FDS BGP_NUM_PEERS
3703 #else
3704 # define EXTRA_FDS 0
3705 #endif
3706
3707 // main loop - gets packets on tun or udp and processes them
3708 static void mainloop(void)
3709 {
3710 int i;
3711 uint8_t buf[65536];
3712 clockt next_cluster_ping = 0; // send initial ping immediately
3713 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3714 int maxevent = sizeof(events)/sizeof(*events);
3715
3716 if ((epollfd = epoll_create(maxevent)) < 0)
3717 {
3718 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3719 exit(1);
3720 }
3721
3722 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3723 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3724
3725 /* setup our fds to poll for input */
3726 {
3727 static struct event_data d[BASE_FDS];
3728 struct epoll_event e;
3729
3730 e.events = EPOLLIN;
3731 i = 0;
3732
3733 if (clifd >= 0)
3734 {
3735 d[i].type = FD_TYPE_CLI;
3736 e.data.ptr = &d[i++];
3737 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3738 }
3739
3740 d[i].type = FD_TYPE_CLUSTER;
3741 e.data.ptr = &d[i++];
3742 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3743
3744 d[i].type = FD_TYPE_TUN;
3745 e.data.ptr = &d[i++];
3746 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3747
3748 d[i].type = FD_TYPE_UDP;
3749 e.data.ptr = &d[i++];
3750 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3751
3752 d[i].type = FD_TYPE_CONTROL;
3753 e.data.ptr = &d[i++];
3754 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3755
3756 d[i].type = FD_TYPE_DAE;
3757 e.data.ptr = &d[i++];
3758 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3759
3760 d[i].type = FD_TYPE_NETLINK;
3761 e.data.ptr = &d[i++];
3762 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3763 }
3764
3765 #ifdef BGP
3766 signal(SIGPIPE, SIG_IGN);
3767 bgp_setup(config->as_number);
3768 if (config->bind_address)
3769 bgp_add_route(config->bind_address, 0xffffffff);
3770
3771 for (i = 0; i < BGP_NUM_PEERS; i++)
3772 {
3773 if (config->neighbour[i].name[0])
3774 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3775 config->neighbour[i].as, config->neighbour[i].keepalive,
3776 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3777 }
3778 #endif /* BGP */
3779
3780 while (!main_quit || still_busy())
3781 {
3782 int more = 0;
3783 int n;
3784
3785
3786 if (main_reload)
3787 {
3788 main_reload = 0;
3789 read_config_file();
3790 config->reload_config++;
3791 }
3792
3793 if (config->reload_config)
3794 {
3795 config->reload_config = 0;
3796 update_config();
3797 }
3798
3799 #ifdef BGP
3800 bgp_set_poll();
3801 #endif /* BGP */
3802
3803 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3804 STAT(select_called);
3805
3806 TIME = now(NULL);
3807 if (n < 0)
3808 {
3809 if (errno == EINTR ||
3810 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3811 continue;
3812
3813 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3814 break; // exit
3815 }
3816
3817 if (n)
3818 {
3819 struct sockaddr_in addr;
3820 struct in_addr local;
3821 socklen_t alen;
3822 int c, s;
3823 int udp_ready = 0;
3824 int tun_ready = 0;
3825 int cluster_ready = 0;
3826 int udp_pkts = 0;
3827 int tun_pkts = 0;
3828 int cluster_pkts = 0;
3829 #ifdef BGP
3830 uint32_t bgp_events[BGP_NUM_PEERS];
3831 memset(bgp_events, 0, sizeof(bgp_events));
3832 #endif /* BGP */
3833
3834 for (c = n, i = 0; i < c; i++)
3835 {
3836 struct event_data *d = events[i].data.ptr;
3837
3838 switch (d->type)
3839 {
3840 case FD_TYPE_CLI: // CLI connections
3841 {
3842 int cli;
3843
3844 alen = sizeof(addr);
3845 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3846 {
3847 cli_do(cli);
3848 close(cli);
3849 }
3850 else
3851 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3852
3853 n--;
3854 break;
3855 }
3856
3857 // these are handled below, with multiple interleaved reads
3858 case FD_TYPE_CLUSTER: cluster_ready++; break;
3859 case FD_TYPE_TUN: tun_ready++; break;
3860 case FD_TYPE_UDP: udp_ready++; break;
3861
3862 case FD_TYPE_CONTROL: // nsctl commands
3863 alen = sizeof(addr);
3864 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3865 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3866 n--;
3867 break;
3868
3869 case FD_TYPE_DAE: // DAE requests
3870 alen = sizeof(addr);
3871 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3872 if (s > 0) processdae(buf, s, &addr, alen, &local);
3873 n--;
3874 break;
3875
3876 case FD_TYPE_RADIUS: // RADIUS response
3877 alen = sizeof(addr);
3878 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3879 if (s >= 0 && config->cluster_iam_master)
3880 {
3881 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3882 addr.sin_addr.s_addr == config->radiusserver[1])
3883 processrad(buf, s, d->index);
3884 else
3885 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3886 fmtaddr(addr.sin_addr.s_addr, 0));
3887 }
3888
3889 n--;
3890 break;
3891
3892 #ifdef BGP
3893 case FD_TYPE_BGP:
3894 bgp_events[d->index] = events[i].events;
3895 n--;
3896 break;
3897 #endif /* BGP */
3898
3899 case FD_TYPE_NETLINK:
3900 {
3901 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
3902 s = netlink_recv(buf, sizeof(buf));
3903 if (nh->nlmsg_type == NLMSG_ERROR)
3904 {
3905 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
3906 if (errmsg->error)
3907 {
3908 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
3909 {
3910 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
3911 exit(1);
3912 }
3913 else
3914
3915 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
3916 }
3917 // else it's a ack
3918 }
3919 else
3920 LOG(1, 0, 0, "Got a unknown netlink message: type %d seq %d flags %d\n", nh->nlmsg_type, nh->nlmsg_seq, nh->nlmsg_flags);
3921 n--;
3922 break;
3923 }
3924
3925 default:
3926 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3927 }
3928 }
3929
3930 #ifdef BGP
3931 bgp_process(bgp_events);
3932 #endif /* BGP */
3933
3934 for (c = 0; n && c < config->multi_read_count; c++)
3935 {
3936 // L2TP
3937 if (udp_ready)
3938 {
3939 alen = sizeof(addr);
3940 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3941 {
3942 processudp(buf, s, &addr);
3943 udp_pkts++;
3944 }
3945 else
3946 {
3947 udp_ready = 0;
3948 n--;
3949 }
3950 }
3951
3952 // incoming IP
3953 if (tun_ready)
3954 {
3955 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3956 {
3957 processtun(buf, s);
3958 tun_pkts++;
3959 }
3960 else
3961 {
3962 tun_ready = 0;
3963 n--;
3964 }
3965 }
3966
3967 // cluster
3968 if (cluster_ready)
3969 {
3970 alen = sizeof(addr);
3971 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3972 {
3973 processcluster(buf, s, addr.sin_addr.s_addr);
3974 cluster_pkts++;
3975 }
3976 else
3977 {
3978 cluster_ready = 0;
3979 n--;
3980 }
3981 }
3982 }
3983
3984 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3985 STAT(multi_read_used);
3986
3987 if (c >= config->multi_read_count)
3988 {
3989 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3990 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3991
3992 STAT(multi_read_exceeded);
3993 more++;
3994 }
3995 }
3996
3997 if (time_changed)
3998 {
3999 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4000
4001 // Log current traffic stats
4002 snprintf(config->bandwidth, sizeof(config->bandwidth),
4003 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4004 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4005 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4006 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4007
4008 udp_tx = udp_rx = 0;
4009 udp_rx_pkt = eth_rx_pkt = 0;
4010 eth_tx = eth_rx = 0;
4011 time_changed = 0;
4012
4013 if (config->dump_speed)
4014 printf("%s\n", config->bandwidth);
4015
4016 // Update the internal time counter
4017 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4018
4019 {
4020 // Run timer hooks
4021 struct param_timer p = { time_now };
4022 run_plugins(PLUGIN_TIMER, &p);
4023 }
4024 }
4025
4026 // Runs on every machine (master and slaves).
4027 if (next_cluster_ping <= TIME)
4028 {
4029 // Check to see which of the cluster is still alive..
4030
4031 cluster_send_ping(basetime); // Only does anything if we're a slave
4032 cluster_check_master(); // ditto.
4033
4034 cluster_heartbeat(); // Only does anything if we're a master.
4035 cluster_check_slaves(); // ditto.
4036
4037 master_update_counts(); // If we're a slave, send our byte counters to our master.
4038
4039 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4040 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4041 else
4042 next_cluster_ping = TIME + config->cluster_hb_interval;
4043 }
4044
4045 if (!config->cluster_iam_master)
4046 continue;
4047
4048 // Run token bucket filtering queue..
4049 // Only run it every 1/10th of a second.
4050 {
4051 static clockt last_run = 0;
4052 if (last_run != TIME)
4053 {
4054 last_run = TIME;
4055 tbf_run_timer();
4056 }
4057 }
4058
4059 // Handle timeouts, retries etc.
4060 {
4061 static double last_clean = 0;
4062 double this_clean;
4063 double diff;
4064
4065 TIME = now(&this_clean);
4066 diff = this_clean - last_clean;
4067
4068 // Run during idle time (after we've handled
4069 // all incoming packets) or every 1/10th sec
4070 if (!more || diff > 0.1)
4071 {
4072 regular_cleanups(diff);
4073 last_clean = this_clean;
4074 }
4075 }
4076
4077 if (*config->accounting_dir)
4078 {
4079 static clockt next_acct = 0;
4080 static clockt next_shut_acct = 0;
4081
4082 if (next_acct <= TIME)
4083 {
4084 // Dump accounting data
4085 next_acct = TIME + ACCT_TIME;
4086 next_shut_acct = TIME + ACCT_SHUT_TIME;
4087 dump_acct_info(1);
4088 }
4089 else if (next_shut_acct <= TIME)
4090 {
4091 // Dump accounting data for shutdown sessions
4092 next_shut_acct = TIME + ACCT_SHUT_TIME;
4093 if (shut_acct_n)
4094 dump_acct_info(0);
4095 }
4096 }
4097 }
4098
4099 // Are we the master and shutting down??
4100 if (config->cluster_iam_master)
4101 cluster_heartbeat(); // Flush any queued changes..
4102
4103 // Ok. Notify everyone we're shutting down. If we're
4104 // the master, this will force an election.
4105 cluster_send_ping(0);
4106
4107 //
4108 // Important!!! We MUST not process any packets past this point!
4109 LOG(1, 0, 0, "Shutdown complete\n");
4110 }
4111
4112 static void stripdomain(char *host)
4113 {
4114 char *p;
4115
4116 if ((p = strchr(host, '.')))
4117 {
4118 char *domain = 0;
4119 char _domain[1024];
4120
4121 // strip off domain
4122 FILE *resolv = fopen("/etc/resolv.conf", "r");
4123 if (resolv)
4124 {
4125 char buf[1024];
4126 char *b;
4127
4128 while (fgets(buf, sizeof(buf), resolv))
4129 {
4130 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4131 continue;
4132
4133 if (!isspace(buf[6]))
4134 continue;
4135
4136 b = buf + 7;
4137 while (isspace(*b)) b++;
4138
4139 if (*b)
4140 {
4141 char *d = b;
4142 while (*b && !isspace(*b)) b++;
4143 *b = 0;
4144 if (buf[0] == 'd') // domain is canonical
4145 {
4146 domain = d;
4147 break;
4148 }
4149
4150 // first search line
4151 if (!domain)
4152 {
4153 // hold, may be subsequent domain line
4154 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4155 domain = _domain;
4156 }
4157 }
4158 }
4159
4160 fclose(resolv);
4161 }
4162
4163 if (domain)
4164 {
4165 int hl = strlen(host);
4166 int dl = strlen(domain);
4167 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4168 host[hl -dl - 1] = 0;
4169 }
4170 else
4171 {
4172 *p = 0; // everything after first dot
4173 }
4174 }
4175 }
4176
4177 // Init data structures
4178 static void initdata(int optdebug, char *optconfig)
4179 {
4180 int i;
4181
4182 if (!(config = shared_malloc(sizeof(configt))))
4183 {
4184 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4185 exit(1);
4186 }
4187
4188 memset(config, 0, sizeof(configt));
4189 time(&config->start_time);
4190 strncpy(config->config_file, optconfig, strlen(optconfig));
4191 config->debug = optdebug;
4192 config->num_tbfs = MAXTBFS;
4193 config->rl_rate = 28; // 28kbps
4194 config->cluster_mcast_ttl = 1;
4195 config->cluster_master_min_adv = 1;
4196 config->ppp_restart_time = 3;
4197 config->ppp_max_configure = 10;
4198 config->ppp_max_failure = 5;
4199 config->kill_timedout_sessions = 1;
4200 strcpy(config->random_device, RANDOMDEVICE);
4201
4202 log_stream = stderr;
4203
4204 #ifdef RINGBUFFER
4205 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4206 {
4207 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4208 exit(1);
4209 }
4210 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4211 #endif
4212
4213 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4214 {
4215 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4216 exit(1);
4217 }
4218 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4219 {
4220 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4221 exit(1);
4222 }
4223 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4224 {
4225 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4226 exit(1);
4227 }
4228 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4229 {
4230 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4231 exit(1);
4232 }
4233 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4234 {
4235 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4236 exit(1);
4237 }
4238
4239 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4240 {
4241 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4242 exit(1);
4243 }
4244
4245 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4246 {
4247 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4248 exit(1);
4249 }
4250
4251 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4252 {
4253 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4254 exit(1);
4255 }
4256
4257 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4258 {
4259 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4260 exit(1);
4261 }
4262 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4263
4264 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4265 {
4266 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4267 exit(1);
4268 }
4269 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4270
4271 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4272 {
4273 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4274 exit(1);
4275 }
4276 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4277
4278 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4279 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4280 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4281 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4282 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4283
4284 // Put all the sessions on the free list marked as undefined.
4285 for (i = 1; i < MAXSESSION; i++)
4286 {
4287 session[i].next = i + 1;
4288 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4289 }
4290 session[MAXSESSION - 1].next = 0;
4291 sessionfree = 1;
4292
4293 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4294 for (i = 1; i < MAXTUNNEL; i++)
4295 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4296
4297 for (i = 1; i < MAXBUNDLE; i++) {
4298 bundle[i].state = BUNDLEUNDEF;
4299 }
4300
4301 if (!*hostname)
4302 {
4303 // Grab my hostname unless it's been specified
4304 gethostname(hostname, sizeof(hostname));
4305 stripdomain(hostname);
4306 }
4307
4308 _statistics->start_time = _statistics->last_reset = time(NULL);
4309
4310 #ifdef BGP
4311 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4312 {
4313 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4314 exit(1);
4315 }
4316 #endif /* BGP */
4317 }
4318
4319 static int assign_ip_address(sessionidt s)
4320 {
4321 uint32_t i;
4322 int best = -1;
4323 time_t best_time = time_now;
4324 char *u = session[s].user;
4325 char reuse = 0;
4326
4327
4328 CSTAT(assign_ip_address);
4329
4330 for (i = 1; i < ip_pool_size; i++)
4331 {
4332 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4333 continue;
4334
4335 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4336 {
4337 best = i;
4338 reuse = 1;
4339 break;
4340 }
4341
4342 if (ip_address_pool[i].last < best_time)
4343 {
4344 best = i;
4345 if (!(best_time = ip_address_pool[i].last))
4346 break; // never used, grab this one
4347 }
4348 }
4349
4350 if (best < 0)
4351 {
4352 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4353 return 0;
4354 }
4355
4356 session[s].ip = ip_address_pool[best].address;
4357 session[s].ip_pool_index = best;
4358 ip_address_pool[best].assigned = 1;
4359 ip_address_pool[best].last = time_now;
4360 ip_address_pool[best].session = s;
4361 if (session[s].walled_garden)
4362 /* Don't track addresses of users in walled garden (note: this
4363 means that their address isn't "sticky" even if they get
4364 un-gardened). */
4365 ip_address_pool[best].user[0] = 0;
4366 else
4367 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4368
4369 STAT(ip_allocated);
4370 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4371 reuse ? "Reusing" : "Allocating", best);
4372
4373 return 1;
4374 }
4375
4376 static void free_ip_address(sessionidt s)
4377 {
4378 int i = session[s].ip_pool_index;
4379
4380
4381 CSTAT(free_ip_address);
4382
4383 if (!session[s].ip)
4384 return; // what the?
4385
4386 if (i < 0) // Is this actually part of the ip pool?
4387 i = 0;
4388
4389 STAT(ip_freed);
4390 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4391 session[s].ip = 0;
4392 ip_address_pool[i].assigned = 0;
4393 ip_address_pool[i].session = 0;
4394 ip_address_pool[i].last = time_now;
4395 }
4396
4397 //
4398 // Fsck the address pool against the session table.
4399 // Normally only called when we become a master.
4400 //
4401 // This isn't perfect: We aren't keep tracking of which
4402 // users used to have an IP address.
4403 //
4404 void rebuild_address_pool(void)
4405 {
4406 int i;
4407
4408 //
4409 // Zero the IP pool allocation, and build
4410 // a map from IP address to pool index.
4411 for (i = 1; i < MAXIPPOOL; ++i)
4412 {
4413 ip_address_pool[i].assigned = 0;
4414 ip_address_pool[i].session = 0;
4415 if (!ip_address_pool[i].address)
4416 continue;
4417
4418 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4419 }
4420
4421 for (i = 0; i < MAXSESSION; ++i)
4422 {
4423 int ipid;
4424 if (!(session[i].opened && session[i].ip))
4425 continue;
4426
4427 ipid = - lookup_ipmap(htonl(session[i].ip));
4428
4429 if (session[i].ip_pool_index < 0)
4430 {
4431 // Not allocated out of the pool.
4432 if (ipid < 1) // Not found in the pool either? good.
4433 continue;
4434
4435 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4436 i, fmtaddr(session[i].ip, 0), ipid);
4437
4438 // Fall through and process it as part of the pool.
4439 }
4440
4441
4442 if (ipid > MAXIPPOOL || ipid < 0)
4443 {
4444 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4445 ipid = -1;
4446 session[i].ip_pool_index = ipid;
4447 continue;
4448 }
4449
4450 ip_address_pool[ipid].assigned = 1;
4451 ip_address_pool[ipid].session = i;
4452 ip_address_pool[ipid].last = time_now;
4453 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4454 session[i].ip_pool_index = ipid;
4455 cache_ipmap(session[i].ip, i); // Fix the ip map.
4456 }
4457 }
4458
4459 //
4460 // Fix the address pool to match a changed session.
4461 // (usually when the master sends us an update).
4462 static void fix_address_pool(int sid)
4463 {
4464 int ipid;
4465
4466 ipid = session[sid].ip_pool_index;
4467
4468 if (ipid > ip_pool_size)
4469 return; // Ignore it. rebuild_address_pool will fix it up.
4470
4471 if (ip_address_pool[ipid].address != session[sid].ip)
4472 return; // Just ignore it. rebuild_address_pool will take care of it.
4473
4474 ip_address_pool[ipid].assigned = 1;
4475 ip_address_pool[ipid].session = sid;
4476 ip_address_pool[ipid].last = time_now;
4477 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4478 }
4479
4480 //
4481 // Add a block of addresses to the IP pool to hand out.
4482 //
4483 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4484 {
4485 int i;
4486 if (prefixlen == 0)
4487 prefixlen = 32; // Host route only.
4488
4489 addr &= 0xffffffff << (32 - prefixlen);
4490
4491 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4492 return ;
4493
4494 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4495 {
4496 if ((i & 0xff) == 0 || (i&0xff) == 255)
4497 continue; // Skip 0 and broadcast addresses.
4498
4499 ip_address_pool[ip_pool_size].address = i;
4500 ip_address_pool[ip_pool_size].assigned = 0;
4501 ++ip_pool_size;
4502 if (ip_pool_size >= MAXIPPOOL)
4503 {
4504 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4505 return;
4506 }
4507 }
4508 }
4509
4510 // Initialize the IP address pool
4511 static void initippool()
4512 {
4513 FILE *f;
4514 char *p;
4515 char buf[4096];
4516 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4517
4518 if (!(f = fopen(IPPOOLFILE, "r")))
4519 {
4520 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4521 exit(1);
4522 }
4523
4524 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4525 {
4526 char *pool = buf;
4527 buf[4095] = 0; // Force it to be zero terminated/
4528
4529 if (*buf == '#' || *buf == '\n')
4530 continue; // Skip comments / blank lines
4531 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4532 if ((p = (char *)strchr(buf, ':')))
4533 {
4534 in_addr_t src;
4535 *p = '\0';
4536 src = inet_addr(buf);
4537 if (src == INADDR_NONE)
4538 {
4539 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4540 exit(1);
4541 }
4542 // This entry is for a specific IP only
4543 if (src != config->bind_address)
4544 continue;
4545 *p = ':';
4546 pool = p+1;
4547 }
4548 if ((p = (char *)strchr(pool, '/')))
4549 {
4550 // It's a range
4551 int numbits = 0;
4552 in_addr_t start = 0;
4553
4554 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4555 *p++ = 0;
4556 if (!*p || !(numbits = atoi(p)))
4557 {
4558 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4559 continue;
4560 }
4561 start = ntohl(inet_addr(pool));
4562
4563 // Add a static route for this pool
4564 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4565 fmtaddr(htonl(start), 0), numbits);
4566
4567 routeset(0, start, numbits, 0, 1);
4568
4569 add_to_ip_pool(start, numbits);
4570 }
4571 else
4572 {
4573 // It's a single ip address
4574 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4575 }
4576 }
4577 fclose(f);
4578 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4579 }
4580
4581 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4582 {
4583 struct sockaddr_in snoop_addr = {0};
4584 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4585 return;
4586
4587 snoop_addr.sin_family = AF_INET;
4588 snoop_addr.sin_addr.s_addr = destination;
4589 snoop_addr.sin_port = ntohs(port);
4590
4591 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4592 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4593 htons(snoop_addr.sin_port));
4594
4595 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4596 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4597
4598 STAT(packets_snooped);
4599 }
4600
4601 static int dump_session(FILE **f, sessiont *s)
4602 {
4603 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4604 return 1;
4605
4606 if (!*f)
4607 {
4608 char filename[1024];
4609 char timestr[64];
4610 time_t now = time(NULL);
4611
4612 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4613 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4614
4615 if (!(*f = fopen(filename, "w")))
4616 {
4617 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4618 return 0;
4619 }
4620
4621 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4622 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4623 "# host: %s\n"
4624 "# endpoint: %s\n"
4625 "# time: %ld\n"
4626 "# uptime: %ld\n"
4627 "# format: username ip qos uptxoctets downrxoctets\n",
4628 hostname,
4629 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4630 now,
4631 now - basetime);
4632 }
4633
4634 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4635 fprintf(*f, "%s %s %d %u %u\n",
4636 s->user, // username
4637 fmtaddr(htonl(s->ip), 0), // ip
4638 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4639 (uint32_t) s->cin_delta, // uptxoctets
4640 (uint32_t) s->cout_delta); // downrxoctets
4641
4642 s->cin_delta = s->cout_delta = 0;
4643
4644 return 1;
4645 }
4646
4647 static void dump_acct_info(int all)
4648 {
4649 int i;
4650 FILE *f = NULL;
4651
4652
4653 CSTAT(dump_acct_info);
4654
4655 if (shut_acct_n)
4656 {
4657 for (i = 0; i < shut_acct_n; i++)
4658 dump_session(&f, &shut_acct[i]);
4659
4660 shut_acct_n = 0;
4661 }
4662
4663 if (all)
4664 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4665 dump_session(&f, &session[i]);
4666
4667 if (f)
4668 fclose(f);
4669 }
4670
4671 // Main program
4672 int main(int argc, char *argv[])
4673 {
4674 int i;
4675 int optdebug = 0;
4676 char *optconfig = CONFIGFILE;
4677
4678 time(&basetime); // start clock
4679
4680 // scan args
4681 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4682 {
4683 switch (i)
4684 {
4685 case 'd':
4686 if (fork()) exit(0);
4687 setsid();
4688 freopen("/dev/null", "r", stdin);
4689 freopen("/dev/null", "w", stdout);
4690 freopen("/dev/null", "w", stderr);
4691 break;
4692 case 'v':
4693 optdebug++;
4694 break;
4695 case 'c':
4696 optconfig = optarg;
4697 break;
4698 case 'h':
4699 snprintf(hostname, sizeof(hostname), "%s", optarg);
4700 break;
4701 default:
4702 printf("Args are:\n"
4703 "\t-d\t\tDetach from terminal\n"
4704 "\t-c <file>\tConfig file\n"
4705 "\t-h <hostname>\tForce hostname\n"
4706 "\t-v\t\tDebug\n");
4707
4708 return (0);
4709 break;
4710 }
4711 }
4712
4713 // Start the timer routine off
4714 time(&time_now);
4715 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4716
4717 initplugins();
4718 initdata(optdebug, optconfig);
4719
4720 init_cli(hostname);
4721 read_config_file();
4722 update_config();
4723 init_tbf(config->num_tbfs);
4724
4725 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4726 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4727 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4728 {
4729 struct rlimit rlim;
4730 rlim.rlim_cur = RLIM_INFINITY;
4731 rlim.rlim_max = RLIM_INFINITY;
4732 // Remove the maximum core size
4733 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4734 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4735
4736 // Make core dumps go to /tmp
4737 chdir("/tmp");
4738 }
4739
4740 if (config->scheduler_fifo)
4741 {
4742 int ret;
4743 struct sched_param params = {0};
4744 params.sched_priority = 1;
4745
4746 if (get_nprocs() < 2)
4747 {
4748 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4749 config->scheduler_fifo = 0;
4750 }
4751 else
4752 {
4753 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4754 {
4755 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4756 }
4757 else
4758 {
4759 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4760 config->scheduler_fifo = 0;
4761 }
4762 }
4763 }
4764
4765 initnetlink();
4766
4767 /* Set up the cluster communications port. */
4768 if (cluster_init() < 0)
4769 exit(1);
4770
4771 inittun();
4772 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4773
4774 initudp();
4775 initrad();
4776 initippool();
4777
4778 // seed prng
4779 {
4780 unsigned seed = time_now ^ getpid();
4781 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4782 srand(seed);
4783 }
4784
4785 signal(SIGHUP, sighup_handler);
4786 signal(SIGCHLD, sigchild_handler);
4787 signal(SIGTERM, shutdown_handler);
4788 signal(SIGINT, shutdown_handler);
4789 signal(SIGQUIT, shutdown_handler);
4790
4791 // Prevent us from getting paged out
4792 if (config->lock_pages)
4793 {
4794 if (!mlockall(MCL_CURRENT))
4795 LOG(1, 0, 0, "Locking pages into memory\n");
4796 else
4797 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4798 }
4799
4800 mainloop();
4801
4802 /* remove plugins (so cleanup code gets run) */
4803 plugins_done();
4804
4805 // Remove the PID file if we wrote it
4806 if (config->wrote_pid && *config->pid_file == '/')
4807 unlink(config->pid_file);
4808
4809 /* kill CLI children */
4810 signal(SIGTERM, SIG_IGN);
4811 kill(0, SIGTERM);
4812 return 0;
4813 }
4814
4815 static void sighup_handler(int sig)
4816 {
4817 main_reload++;
4818 }
4819
4820 static void shutdown_handler(int sig)
4821 {
4822 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4823 }
4824
4825 static void sigchild_handler(int sig)
4826 {
4827 while (waitpid(-1, NULL, WNOHANG) > 0)
4828 ;
4829 }
4830
4831 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4832 {
4833 MD5_CTX ctx;
4834 *challenge_response = NULL;
4835
4836 if (!*config->l2tp_secret)
4837 {
4838 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4839 return;
4840 }
4841
4842 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4843
4844 *challenge_response = calloc(17, 1);
4845
4846 MD5_Init(&ctx);
4847 MD5_Update(&ctx, &id, 1);
4848 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4849 MD5_Update(&ctx, challenge, challenge_length);
4850 MD5_Final(*challenge_response, &ctx);
4851
4852 return;
4853 }
4854
4855 static int facility_value(char *name)
4856 {
4857 int i;
4858 for (i = 0; facilitynames[i].c_name; i++)
4859 {
4860 if (strcmp(facilitynames[i].c_name, name) == 0)
4861 return facilitynames[i].c_val;
4862 }
4863 return 0;
4864 }
4865
4866 static void update_config()
4867 {
4868 int i;
4869 char *p;
4870 static int timeout = 0;
4871 static int interval = 0;
4872
4873 // Update logging
4874 closelog();
4875 syslog_log = 0;
4876 if (log_stream)
4877 {
4878 if (log_stream != stderr)
4879 fclose(log_stream);
4880
4881 log_stream = NULL;
4882 }
4883
4884 if (*config->log_filename)
4885 {
4886 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4887 {
4888 char *p = config->log_filename + 7;
4889 if (*p)
4890 {
4891 openlog("l2tpns", LOG_PID, facility_value(p));
4892 syslog_log = 1;
4893 }
4894 }
4895 else if (strchr(config->log_filename, '/') == config->log_filename)
4896 {
4897 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4898 {
4899 fseek(log_stream, 0, SEEK_END);
4900 setbuf(log_stream, NULL);
4901 }
4902 else
4903 {
4904 log_stream = stderr;
4905 setbuf(log_stream, NULL);
4906 }
4907 }
4908 }
4909 else
4910 {
4911 log_stream = stderr;
4912 setbuf(log_stream, NULL);
4913 }
4914
4915 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4916 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4917
4918 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4919 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4920 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4921
4922 // reset MRU/MSS globals
4923 MRU = config->l2tp_mtu - L2TP_HDRS;
4924 if (MRU > PPPoE_MRU)
4925 MRU = PPPoE_MRU;
4926
4927 MSS = MRU - TCP_HDRS;
4928
4929 // Update radius
4930 config->numradiusservers = 0;
4931 for (i = 0; i < MAXRADSERVER; i++)
4932 if (config->radiusserver[i])
4933 {
4934 config->numradiusservers++;
4935 // Set radius port: if not set, take the port from the
4936 // first radius server. For the first radius server,
4937 // take the #defined default value from l2tpns.h
4938
4939 // test twice, In case someone works with
4940 // a secondary radius server without defining
4941 // a primary one, this will work even then.
4942 if (i > 0 && !config->radiusport[i])
4943 config->radiusport[i] = config->radiusport[i-1];
4944 if (!config->radiusport[i])
4945 config->radiusport[i] = RADPORT;
4946 }
4947
4948 if (!config->numradiusservers)
4949 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4950
4951 // parse radius_authtypes_s
4952 config->radius_authtypes = config->radius_authprefer = 0;
4953 p = config->radius_authtypes_s;
4954 while (p && *p)
4955 {
4956 char *s = strpbrk(p, " \t,");
4957 int type = 0;
4958
4959 if (s)
4960 {
4961 *s++ = 0;
4962 while (*s == ' ' || *s == '\t')
4963 s++;
4964
4965 if (!*s)
4966 s = 0;
4967 }
4968
4969 if (!strncasecmp("chap", p, strlen(p)))
4970 type = AUTHCHAP;
4971 else if (!strncasecmp("pap", p, strlen(p)))
4972 type = AUTHPAP;
4973 else
4974 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4975
4976 config->radius_authtypes |= type;
4977 if (!config->radius_authprefer)
4978 config->radius_authprefer = type;
4979
4980 p = s;
4981 }
4982
4983 if (!config->radius_authtypes)
4984 {
4985 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4986 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4987 }
4988
4989 // normalise radius_authtypes_s
4990 if (config->radius_authprefer == AUTHPAP)
4991 {
4992 strcpy(config->radius_authtypes_s, "pap");
4993 if (config->radius_authtypes & AUTHCHAP)
4994 strcat(config->radius_authtypes_s, ", chap");
4995 }
4996 else
4997 {
4998 strcpy(config->radius_authtypes_s, "chap");
4999 if (config->radius_authtypes & AUTHPAP)
5000 strcat(config->radius_authtypes_s, ", pap");
5001 }
5002
5003 if (!config->radius_dae_port)
5004 config->radius_dae_port = DAEPORT;
5005
5006 // re-initialise the random number source
5007 initrandom(config->random_device);
5008
5009 // Update plugins
5010 for (i = 0; i < MAXPLUGINS; i++)
5011 {
5012 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5013 continue;
5014
5015 if (*config->plugins[i])
5016 {
5017 // Plugin added
5018 add_plugin(config->plugins[i]);
5019 }
5020 else if (*config->old_plugins[i])
5021 {
5022 // Plugin removed
5023 remove_plugin(config->old_plugins[i]);
5024 }
5025 }
5026
5027 // Guest change
5028 guest_accounts_num = 0;
5029 char *p2 = config->guest_user;
5030 while (p2 && *p2)
5031 {
5032 char *s = strpbrk(p2, " \t,");
5033 if (s)
5034 {
5035 *s++ = 0;
5036 while (*s == ' ' || *s == '\t')
5037 s++;
5038
5039 if (!*s)
5040 s = 0;
5041 }
5042
5043 strcpy(guest_users[guest_accounts_num], p2);
5044 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5045 guest_accounts_num++;
5046 p2 = s;
5047 }
5048 // Rebuild the guest_user array
5049 strcpy(config->guest_user, "");
5050 int ui = 0;
5051 for (ui=0; ui<guest_accounts_num; ui++)
5052 {
5053 strcat(config->guest_user, guest_users[ui]);
5054 if (ui<guest_accounts_num-1)
5055 {
5056 strcat(config->guest_user, ",");
5057 }
5058 }
5059
5060
5061 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5062 if (!config->multi_read_count) config->multi_read_count = 10;
5063 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5064 if (!*config->cluster_interface)
5065 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5066
5067 if (!config->cluster_hb_interval)
5068 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5069
5070 if (!config->cluster_hb_timeout)
5071 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5072
5073 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5074 {
5075 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5076 // late, ensure we're sufficiently larger than that
5077 int t = 4 * config->cluster_hb_interval + 11;
5078
5079 if (config->cluster_hb_timeout < t)
5080 {
5081 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5082 config->cluster_hb_timeout = t;
5083 }
5084
5085 // Push timing changes to the slaves immediately if we're the master
5086 if (config->cluster_iam_master)
5087 cluster_heartbeat();
5088
5089 interval = config->cluster_hb_interval;
5090 timeout = config->cluster_hb_timeout;
5091 }
5092
5093 // Write PID file
5094 if (*config->pid_file == '/' && !config->wrote_pid)
5095 {
5096 FILE *f;
5097 if ((f = fopen(config->pid_file, "w")))
5098 {
5099 fprintf(f, "%d\n", getpid());
5100 fclose(f);
5101 config->wrote_pid = 1;
5102 }
5103 else
5104 {
5105 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5106 }
5107 }
5108 }
5109
5110 static void read_config_file()
5111 {
5112 FILE *f;
5113
5114 if (!config->config_file) return;
5115 if (!(f = fopen(config->config_file, "r")))
5116 {
5117 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5118 return;
5119 }
5120
5121 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5122 cli_do_file(f);
5123 LOG(3, 0, 0, "Done reading config file\n");
5124 fclose(f);
5125 }
5126
5127 int sessionsetup(sessionidt s, tunnelidt t)
5128 {
5129 // A session now exists, set it up
5130 in_addr_t ip;
5131 char *user;
5132 sessionidt i;
5133 int r;
5134
5135 CSTAT(sessionsetup);
5136
5137 LOG(3, s, t, "Doing session setup for session\n");
5138
5139 // Join a bundle if the MRRU option is accepted
5140 if(session[s].mrru > 0 && session[s].bundle == 0)
5141 {
5142 LOG(3, s, t, "This session can be part of multilink bundle\n");
5143 if (join_bundle(s) > 0)
5144 cluster_send_bundle(session[s].bundle);
5145 else
5146 {
5147 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5148 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5149 return 0;
5150 }
5151 }
5152
5153 if (!session[s].ip)
5154 {
5155 assign_ip_address(s);
5156 if (!session[s].ip)
5157 {
5158 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5159 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5160 return 0;
5161 }
5162 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5163 fmtaddr(htonl(session[s].ip), 0));
5164 }
5165
5166
5167 // Make sure this is right
5168 session[s].tunnel = t;
5169
5170 // zap old sessions with same IP and/or username
5171 // Don't kill gardened sessions - doing so leads to a DoS
5172 // from someone who doesn't need to know the password
5173 {
5174 ip = session[s].ip;
5175 user = session[s].user;
5176 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5177 {
5178 if (i == s) continue;
5179 if (!session[s].opened) continue;
5180 // Allow duplicate sessions for multilink ones of the same bundle.
5181 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
5182 continue;
5183 if (ip == session[i].ip)
5184 {
5185 sessionkill(i, "Duplicate IP address");
5186 continue;
5187 }
5188
5189 if (config->allow_duplicate_users) continue;
5190 if (session[s].walled_garden || session[i].walled_garden) continue;
5191 // Guest change
5192 int found = 0;
5193 int gu;
5194 for (gu = 0; gu < guest_accounts_num; gu++)
5195 {
5196 if (!strcasecmp(user, guest_users[gu]))
5197 {
5198 found = 1;
5199 break;
5200 }
5201 }
5202 if (found) continue;
5203
5204 // Drop the new session in case of duplicate sessionss, not the old one.
5205 if (!strcasecmp(user, session[i].user))
5206 sessionkill(i, "Duplicate session for users");
5207 }
5208 }
5209
5210 // no need to set a route for the same IP address of the bundle
5211 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5212 {
5213 int routed = 0;
5214
5215 // Add the route for this session.
5216 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5217 {
5218 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5219 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5220 routed++;
5221
5222 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5223 }
5224
5225 // Static IPs need to be routed if not already
5226 // convered by a Framed-Route. Anything else is part
5227 // of the IP address pool and is already routed, it
5228 // just needs to be added to the IP cache.
5229 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5230 if (session[s].ip_pool_index == -1) // static ip
5231 {
5232 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5233 }
5234 else
5235 cache_ipmap(session[s].ip, s);
5236 }
5237
5238 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5239 lcp_open(s, t); // transition to Network phase and send initial IPCP
5240
5241 // Run the plugin's against this new session.
5242 {
5243 struct param_new_session data = { &tunnel[t], &session[s] };
5244 run_plugins(PLUGIN_NEW_SESSION, &data);
5245 }
5246
5247 // Allocate TBFs if throttled
5248 if (session[s].throttle_in || session[s].throttle_out)
5249 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5250
5251 session[s].last_packet = session[s].last_data = time_now;
5252
5253 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5254 fmtaddr(htonl(session[s].ip), 0),
5255 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5256
5257 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5258
5259 return 1; // RADIUS OK and IP allocated, done...
5260 }
5261
5262 //
5263 // This session just got dropped on us by the master or something.
5264 // Make sure our tables up up to date...
5265 //
5266 int load_session(sessionidt s, sessiont *new)
5267 {
5268 int i;
5269 int newip = 0;
5270
5271 // Sanity checks.
5272 if (new->ip_pool_index >= MAXIPPOOL ||
5273 new->tunnel >= MAXTUNNEL)
5274 {
5275 LOG(0, s, 0, "Strange session update received!\n");
5276 // FIXME! What to do here?
5277 return 0;
5278 }
5279
5280 //
5281 // Ok. All sanity checks passed. Now we're committed to
5282 // loading the new session.
5283 //
5284
5285 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5286
5287 // See if routes/ip cache need updating
5288 if (new->ip != session[s].ip)
5289 newip++;
5290
5291 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5292 if (new->route[i].ip != session[s].route[i].ip ||
5293 new->route[i].prefixlen != session[s].route[i].prefixlen)
5294 newip++;
5295
5296 // needs update
5297 if (newip)
5298 {
5299 int routed = 0;
5300
5301 // remove old routes...
5302 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5303 {
5304 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5305 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5306 routed++;
5307
5308 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5309 }
5310
5311 // ...ip
5312 if (session[s].ip)
5313 {
5314 if (session[s].ip_pool_index == -1) // static IP
5315 {
5316 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5317 }
5318 else // It's part of the IP pool, remove it manually.
5319 uncache_ipmap(session[s].ip);
5320 }
5321
5322 routed = 0;
5323
5324 // add new routes...
5325 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5326 {
5327 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5328 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5329 routed++;
5330
5331 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5332 }
5333
5334 // ...ip
5335 if (new->ip)
5336 {
5337 // If there's a new one, add it.
5338 if (new->ip_pool_index == -1)
5339 {
5340 if (!routed) routeset(s, new->ip, 0, 0, 1);
5341 }
5342 else
5343 cache_ipmap(new->ip, s);
5344 }
5345 }
5346
5347 // check v6 routing
5348 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5349 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5350
5351 // check filters
5352 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5353 {
5354 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5355 new->filter_in = 0;
5356 }
5357
5358 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5359 {
5360 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5361 new->filter_out = 0;
5362 }
5363
5364 if (new->filter_in != session[s].filter_in)
5365 {
5366 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5367 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5368 }
5369
5370 if (new->filter_out != session[s].filter_out)
5371 {
5372 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5373 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5374 }
5375
5376 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5377 // for walking the sessions to forward byte counts to the master.
5378 config->cluster_highest_sessionid = s;
5379
5380 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5381
5382 // Do fixups into address pool.
5383 if (new->ip_pool_index != -1)
5384 fix_address_pool(s);
5385
5386 return 1;
5387 }
5388
5389 static void initplugins()
5390 {
5391 int i;
5392
5393 loaded_plugins = ll_init();
5394 // Initialize the plugins to nothing
5395 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5396 plugins[i] = ll_init();
5397 }
5398
5399 static void *open_plugin(char *plugin_name, int load)
5400 {
5401 char path[256] = "";
5402
5403 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5404 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5405 return dlopen(path, RTLD_NOW);
5406 }
5407
5408 // plugin callback to get a config value
5409 static void *getconfig(char *key, enum config_typet type)
5410 {
5411 int i;
5412
5413 for (i = 0; config_values[i].key; i++)
5414 {
5415 if (!strcmp(config_values[i].key, key))
5416 {
5417 if (config_values[i].type == type)
5418 return ((void *) config) + config_values[i].offset;
5419
5420 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5421 key, type, config_values[i].type);
5422
5423 return 0;
5424 }
5425 }
5426
5427 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5428 return 0;
5429 }
5430
5431 static int add_plugin(char *plugin_name)
5432 {
5433 static struct pluginfuncs funcs = {
5434 _log,
5435 _log_hex,
5436 fmtaddr,
5437 sessionbyuser,
5438 sessiontbysessionidt,
5439 sessionidtbysessiont,
5440 radiusnew,
5441 radiussend,
5442 getconfig,
5443 sessionshutdown,
5444 sessionkill,
5445 throttle_session,
5446 cluster_send_session,
5447 };
5448
5449 void *p = open_plugin(plugin_name, 1);
5450 int (*initfunc)(struct pluginfuncs *);
5451 int i;
5452
5453 if (!p)
5454 {
5455 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5456 return -1;
5457 }
5458
5459 if (ll_contains(loaded_plugins, p))
5460 {
5461 dlclose(p);
5462 return 0; // already loaded
5463 }
5464
5465 {
5466 int *v = dlsym(p, "plugin_api_version");
5467 if (!v || *v != PLUGIN_API_VERSION)
5468 {
5469 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5470 dlclose(p);
5471 return -1;
5472 }
5473 }
5474
5475 if ((initfunc = dlsym(p, "plugin_init")))
5476 {
5477 if (!initfunc(&funcs))
5478 {
5479 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5480 dlclose(p);
5481 return -1;
5482 }
5483 }
5484
5485 ll_push(loaded_plugins, p);
5486
5487 for (i = 0; i < max_plugin_functions; i++)
5488 {
5489 void *x;
5490 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5491 {
5492 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5493 ll_push(plugins[i], x);
5494 }
5495 }
5496
5497 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5498 return 1;
5499 }
5500
5501 static void run_plugin_done(void *plugin)
5502 {
5503 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5504
5505 if (donefunc)
5506 donefunc();
5507 }
5508
5509 static int remove_plugin(char *plugin_name)
5510 {
5511 void *p = open_plugin(plugin_name, 0);
5512 int loaded = 0;
5513
5514 if (!p)
5515 return -1;
5516
5517 if (ll_contains(loaded_plugins, p))
5518 {
5519 int i;
5520 for (i = 0; i < max_plugin_functions; i++)
5521 {
5522 void *x;
5523 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5524 ll_delete(plugins[i], x);
5525 }
5526
5527 ll_delete(loaded_plugins, p);
5528 run_plugin_done(p);
5529 loaded = 1;
5530 }
5531
5532 dlclose(p);
5533 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5534 return loaded;
5535 }
5536
5537 int run_plugins(int plugin_type, void *data)
5538 {
5539 int (*func)(void *data);
5540
5541 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5542 return PLUGIN_RET_ERROR;
5543
5544 ll_reset(plugins[plugin_type]);
5545 while ((func = ll_next(plugins[plugin_type])))
5546 {
5547 int r = func(data);
5548
5549 if (r != PLUGIN_RET_OK)
5550 return r; // stop here
5551 }
5552
5553 return PLUGIN_RET_OK;
5554 }
5555
5556 static void plugins_done()
5557 {
5558 void *p;
5559
5560 ll_reset(loaded_plugins);
5561 while ((p = ll_next(loaded_plugins)))
5562 run_plugin_done(p);
5563 }
5564
5565 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5566 {
5567 struct nsctl request;
5568 struct nsctl response;
5569 int type = unpack_control(&request, buf, len);
5570 int r;
5571 void *p;
5572
5573 if (log_stream && config->debug >= 4)
5574 {
5575 if (type < 0)
5576 {
5577 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5578 fmtaddr(addr->sin_addr.s_addr, 0), type);
5579 }
5580 else
5581 {
5582 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5583 dump_control(&request, log_stream);
5584 }
5585 }
5586
5587 switch (type)
5588 {
5589 case NSCTL_REQ_LOAD:
5590 if (request.argc != 1)
5591 {
5592 response.type = NSCTL_RES_ERR;
5593 response.argc = 1;
5594 response.argv[0] = "name of plugin required";
5595 }
5596 else if ((r = add_plugin(request.argv[0])) < 1)
5597 {
5598 response.type = NSCTL_RES_ERR;
5599 response.argc = 1;
5600 response.argv[0] = !r
5601 ? "plugin already loaded"
5602 : "error loading plugin";
5603 }
5604 else
5605 {
5606 response.type = NSCTL_RES_OK;
5607 response.argc = 0;
5608 }
5609
5610 break;
5611
5612 case NSCTL_REQ_UNLOAD:
5613 if (request.argc != 1)
5614 {
5615 response.type = NSCTL_RES_ERR;
5616 response.argc = 1;
5617 response.argv[0] = "name of plugin required";
5618 }
5619 else if ((r = remove_plugin(request.argv[0])) < 1)
5620 {
5621 response.type = NSCTL_RES_ERR;
5622 response.argc = 1;
5623 response.argv[0] = !r
5624 ? "plugin not loaded"
5625 : "plugin not found";
5626 }
5627 else
5628 {
5629 response.type = NSCTL_RES_OK;
5630 response.argc = 0;
5631 }
5632
5633 break;
5634
5635 case NSCTL_REQ_HELP:
5636 response.type = NSCTL_RES_OK;
5637 response.argc = 0;
5638
5639 ll_reset(loaded_plugins);
5640 while ((p = ll_next(loaded_plugins)))
5641 {
5642 char **help = dlsym(p, "plugin_control_help");
5643 while (response.argc < 0xff && help && *help)
5644 response.argv[response.argc++] = *help++;
5645 }
5646
5647 break;
5648
5649 case NSCTL_REQ_CONTROL:
5650 {
5651 struct param_control param = {
5652 config->cluster_iam_master,
5653 request.argc,
5654 request.argv,
5655 0,
5656 NULL,
5657 };
5658
5659 int r = run_plugins(PLUGIN_CONTROL, &param);
5660
5661 if (r == PLUGIN_RET_ERROR)
5662 {
5663 response.type = NSCTL_RES_ERR;
5664 response.argc = 1;
5665 response.argv[0] = param.additional
5666 ? param.additional
5667 : "error returned by plugin";
5668 }
5669 else if (r == PLUGIN_RET_NOTMASTER)
5670 {
5671 static char msg[] = "must be run on master: 000.000.000.000";
5672
5673 response.type = NSCTL_RES_ERR;
5674 response.argc = 1;
5675 if (config->cluster_master_address)
5676 {
5677 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5678 response.argv[0] = msg;
5679 }
5680 else
5681 {
5682 response.argv[0] = "must be run on master: none elected";
5683 }
5684 }
5685 else if (!(param.response & NSCTL_RESPONSE))
5686 {
5687 response.type = NSCTL_RES_ERR;
5688 response.argc = 1;
5689 response.argv[0] = param.response
5690 ? "unrecognised response value from plugin"
5691 : "unhandled action";
5692 }
5693 else
5694 {
5695 response.type = param.response;
5696 response.argc = 0;
5697 if (param.additional)
5698 {
5699 response.argc = 1;
5700 response.argv[0] = param.additional;
5701 }
5702 }
5703 }
5704
5705 break;
5706
5707 default:
5708 response.type = NSCTL_RES_ERR;
5709 response.argc = 1;
5710 response.argv[0] = "error unpacking control packet";
5711 }
5712
5713 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5714 if (!buf)
5715 {
5716 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5717 return;
5718 }
5719
5720 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5721 if (r > 0)
5722 {
5723 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5724 if (log_stream && config->debug >= 4)
5725 {
5726 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5727 dump_control(&response, log_stream);
5728 }
5729 }
5730 else
5731 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5732 fmtaddr(addr->sin_addr.s_addr, 0), r);
5733
5734 free(buf);
5735 }
5736
5737 static tunnelidt new_tunnel()
5738 {
5739 tunnelidt i;
5740 for (i = 1; i < MAXTUNNEL; i++)
5741 {
5742 if (tunnel[i].state == TUNNELFREE)
5743 {
5744 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5745 if (i > config->cluster_highest_tunnelid)
5746 config->cluster_highest_tunnelid = i;
5747 return i;
5748 }
5749 }
5750 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5751 return 0;
5752 }
5753
5754 //
5755 // We're becoming the master. Do any required setup..
5756 //
5757 // This is principally telling all the plugins that we're
5758 // now a master, and telling them about all the sessions
5759 // that are active too..
5760 //
5761 void become_master(void)
5762 {
5763 int s, i;
5764 static struct event_data d[RADIUS_FDS];
5765 struct epoll_event e;
5766
5767 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5768
5769 // running a bunch of iptables commands is slow and can cause
5770 // the master to drop tunnels on takeover--kludge around the
5771 // problem by forking for the moment (note: race)
5772 if (!fork_and_close())
5773 {
5774 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5775 {
5776 if (!session[s].opened) // Not an in-use session.
5777 continue;
5778
5779 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5780 }
5781 exit(0);
5782 }
5783
5784 // add radius fds
5785 e.events = EPOLLIN;
5786 for (i = 0; i < RADIUS_FDS; i++)
5787 {
5788 d[i].type = FD_TYPE_RADIUS;
5789 d[i].index = i;
5790 e.data.ptr = &d[i];
5791
5792 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5793 }
5794 }
5795
5796 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5797 {
5798 int s, i;
5799 int count = 0;
5800 int buckets[64];
5801
5802 if (CLI_HELP_REQUESTED)
5803 return CLI_HELP_NO_ARGS;
5804
5805 time(&time_now);
5806 for (i = 0; i < 64;++i) buckets[i] = 0;
5807
5808 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5809 {
5810 int idle;
5811 if (!session[s].opened)
5812 continue;
5813
5814 idle = time_now - session[s].last_data;
5815 idle /= 5 ; // In multiples of 5 seconds.
5816 if (idle < 0)
5817 idle = 0;
5818 if (idle > 63)
5819 idle = 63;
5820
5821 ++count;
5822 ++buckets[idle];
5823 }
5824
5825 for (i = 0; i < 63; ++i)
5826 {
5827 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5828 }
5829 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5830 cli_print(cli, "%d total sessions open.", count);
5831 return CLI_OK;
5832 }
5833
5834 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5835 {
5836 int s, i;
5837 int count = 0;
5838 int buckets[64];
5839
5840 if (CLI_HELP_REQUESTED)
5841 return CLI_HELP_NO_ARGS;
5842
5843 time(&time_now);
5844 for (i = 0; i < 64;++i) buckets[i] = 0;
5845
5846 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5847 {
5848 int open = 0, d;
5849 if (!session[s].opened)
5850 continue;
5851
5852 d = time_now - session[s].opened;
5853 if (d < 0)
5854 d = 0;
5855 while (d > 1 && open < 32)
5856 {
5857 ++open;
5858 d >>= 1; // half.
5859 }
5860 ++count;
5861 ++buckets[open];
5862 }
5863
5864 s = 1;
5865 for (i = 0; i < 30; ++i)
5866 {
5867 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5868 s <<= 1;
5869 }
5870 cli_print(cli, "%d total sessions open.", count);
5871 return CLI_OK;
5872 }
5873
5874 /* Unhide an avp.
5875 *
5876 * This unencodes the AVP using the L2TP secret and the previously
5877 * stored random vector. It overwrites the hidden data with the
5878 * unhidden AVP subformat.
5879 */
5880 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5881 {
5882 MD5_CTX ctx;
5883 uint8_t digest[16];
5884 uint8_t *last;
5885 size_t d = 0;
5886 uint16_t m = htons(type);
5887
5888 // Compute initial pad
5889 MD5_Init(&ctx);
5890 MD5_Update(&ctx, (unsigned char *) &m, 2);
5891 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5892 MD5_Update(&ctx, vector, vec_len);
5893 MD5_Final(digest, &ctx);
5894
5895 // pointer to last decoded 16 octets
5896 last = value;
5897
5898 while (len > 0)
5899 {
5900 // calculate a new pad based on the last decoded block
5901 if (d >= sizeof(digest))
5902 {
5903 MD5_Init(&ctx);
5904 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5905 MD5_Update(&ctx, last, sizeof(digest));
5906 MD5_Final(digest, &ctx);
5907
5908 d = 0;
5909 last = value;
5910 }
5911
5912 *value++ ^= digest[d++];
5913 len--;
5914 }
5915 }
5916
5917 int find_filter(char const *name, size_t len)
5918 {
5919 int free = -1;
5920 int i;
5921
5922 for (i = 0; i < MAXFILTER; i++)
5923 {
5924 if (!*ip_filters[i].name)
5925 {
5926 if (free < 0)
5927 free = i;
5928
5929 continue;
5930 }
5931
5932 if (strlen(ip_filters[i].name) != len)
5933 continue;
5934
5935 if (!strncmp(ip_filters[i].name, name, len))
5936 return i;
5937 }
5938
5939 return free;
5940 }
5941
5942 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5943 {
5944 switch (p->op)
5945 {
5946 case FILTER_PORT_OP_EQ: return port == p->port;
5947 case FILTER_PORT_OP_NEQ: return port != p->port;
5948 case FILTER_PORT_OP_GT: return port > p->port;
5949 case FILTER_PORT_OP_LT: return port < p->port;
5950 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5951 }
5952
5953 return 0;
5954 }
5955
5956 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5957 {
5958 switch (op)
5959 {
5960 case FILTER_FLAG_OP_ANY:
5961 return (flags & sflags) || (~flags & cflags);
5962
5963 case FILTER_FLAG_OP_ALL:
5964 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5965
5966 case FILTER_FLAG_OP_EST:
5967 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5968 }
5969
5970 return 0;
5971 }
5972
5973 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5974 {
5975 uint16_t frag_offset;
5976 uint8_t proto;
5977 in_addr_t src_ip;
5978 in_addr_t dst_ip;
5979 uint16_t src_port = 0;
5980 uint16_t dst_port = 0;
5981 uint8_t flags = 0;
5982 ip_filter_rulet *rule;
5983
5984 if (len < 20) // up to end of destination address
5985 return 0;
5986
5987 if ((*buf >> 4) != 4) // IPv4
5988 return 0;
5989
5990 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5991 proto = buf[9];
5992 src_ip = *(in_addr_t *) (buf + 12);
5993 dst_ip = *(in_addr_t *) (buf + 16);
5994
5995 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5996 {
5997 int l = (buf[0] & 0xf) * 4; // length of IP header
5998 if (len < l + 4) // ports
5999 return 0;
6000
6001 src_port = ntohs(*(uint16_t *) (buf + l));
6002 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6003 if (proto == IPPROTO_TCP)
6004 {
6005 if (len < l + 14) // flags
6006 return 0;
6007
6008 flags = buf[l + 13] & 0x3f;
6009 }
6010 }
6011
6012 for (rule = ip_filters[filter].rules; rule->action; rule++)
6013 {
6014 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6015 continue;
6016
6017 if (rule->src_wild != INADDR_BROADCAST &&
6018 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6019 continue;
6020
6021 if (rule->dst_wild != INADDR_BROADCAST &&
6022 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6023 continue;
6024
6025 if (frag_offset)
6026 {
6027 // layer 4 deny rules are skipped
6028 if (rule->action == FILTER_ACTION_DENY &&
6029 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6030 continue;
6031 }
6032 else
6033 {
6034 if (rule->frag)
6035 continue;
6036
6037 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6038 {
6039 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6040 continue;
6041
6042 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6043 continue;
6044
6045 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6046 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6047 continue;
6048 }
6049 }
6050
6051 // matched
6052 rule->counter++;
6053 return rule->action == FILTER_ACTION_PERMIT;
6054 }
6055
6056 // default deny
6057 return 0;
6058 }