Merge branch 'use-netlink' into fdn-mods
[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 <net/route.h>
18 #include <sys/mman.h>
19 #include <netdb.h>
20 #include <netinet/in.h>
21 #include <netinet/ip6.h>
22 #include <stdarg.h>
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <string.h>
26 #include <ctype.h>
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <sys/stat.h>
30 #include <sys/time.h>
31 #include <sys/resource.h>
32 #include <sys/wait.h>
33 #include <net/if.h>
34 #include <stddef.h>
35 #include <time.h>
36 #include <dlfcn.h>
37 #include <unistd.h>
38 #include <sched.h>
39 #include <sys/sysinfo.h>
40 #include <libcli.h>
41 #include <linux/netlink.h>
42 #include <linux/rtnetlink.h>
43
44 #include "md5.h"
45 #include "l2tpns.h"
46 #include "cluster.h"
47 #include "plugin.h"
48 #include "ll.h"
49 #include "constants.h"
50 #include "control.h"
51 #include "util.h"
52 #include "tbf.h"
53
54 #ifdef BGP
55 #include "bgp.h"
56 #endif
57
58 // Globals
59 configt *config = NULL; // all configuration
60 int nlfd = -1; // netlink socket
61 int tunfd = -1; // tun interface file handle. (network device)
62 int udpfd = -1; // UDP file handle
63 int controlfd = -1; // Control signal handle
64 int clifd = -1; // Socket listening for CLI connections.
65 int daefd = -1; // Socket listening for DAE connections.
66 int snoopfd = -1; // UDP file handle for sending out intercept data
67 int *radfds = NULL; // RADIUS requests file handles
68 int rand_fd = -1; // Random data source
69 int cluster_sockfd = -1; // Intra-cluster communications socket.
70 int epollfd = -1; // event polling
71 time_t basetime = 0; // base clock
72 char hostname[MAXHOSTNAME] = ""; // us.
73 static int tunidx; // ifr_ifindex of tun device
74 int nlseqnum = 0; // netlink sequence number
75 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
76 static int syslog_log = 0; // are we logging to syslog
77 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
78 uint32_t last_id = 0; // Unique ID for radius accounting
79 // Guest change
80 char guest_users[10][32]; // Array of guest users
81 int guest_accounts_num = 0; // Number of guest users
82
83 // calculated from config->l2tp_mtu
84 uint16_t MRU = 0; // PPP MRU
85 uint16_t MSS = 0; // TCP MSS
86
87 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
88 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
89
90 union iphash {
91 sessionidt sess;
92 union iphash *idx;
93 } ip_hash[256]; // Mapping from IP address to session structures.
94
95 struct ipv6radix {
96 sessionidt sess;
97 struct ipv6radix *branch;
98 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
99
100 // Traffic counters.
101 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
102 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
103 uint32_t eth_tx = 0;
104
105 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
106 time_t time_now = 0; // Current time in seconds since epoch.
107 static char time_now_string[64] = {0}; // Current time as a string.
108 static int time_changed = 0; // time_now changed
109 char main_quit = 0; // True if we're in the process of exiting.
110 static char main_reload = 0; // Re-load pending
111 linked_list *loaded_plugins;
112 linked_list *plugins[MAX_PLUGIN_TYPES];
113
114 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
115 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
116
117 config_descriptt config_values[] = {
118 CONFIG("debug", debug, INT),
119 CONFIG("log_file", log_filename, STRING),
120 CONFIG("pid_file", pid_file, STRING),
121 CONFIG("random_device", random_device, STRING),
122 CONFIG("l2tp_secret", l2tp_secret, STRING),
123 CONFIG("l2tp_mtu", l2tp_mtu, INT),
124 CONFIG("ppp_restart_time", ppp_restart_time, INT),
125 CONFIG("ppp_max_configure", ppp_max_configure, INT),
126 CONFIG("ppp_max_failure", ppp_max_failure, INT),
127 CONFIG("primary_dns", default_dns1, IPv4),
128 CONFIG("secondary_dns", default_dns2, IPv4),
129 CONFIG("primary_radius", radiusserver[0], IPv4),
130 CONFIG("secondary_radius", radiusserver[1], IPv4),
131 CONFIG("primary_radius_port", radiusport[0], SHORT),
132 CONFIG("secondary_radius_port", radiusport[1], SHORT),
133 CONFIG("radius_accounting", radius_accounting, BOOL),
134 CONFIG("radius_interim", radius_interim, INT),
135 CONFIG("radius_secret", radiussecret, STRING),
136 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
137 CONFIG("radius_dae_port", radius_dae_port, SHORT),
138 CONFIG("radius_bind_min", radius_bind_min, SHORT),
139 CONFIG("radius_bind_max", radius_bind_max, SHORT),
140 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
141 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
142 CONFIG("guest_account", guest_user, STRING),
143 CONFIG("bind_address", bind_address, IPv4),
144 CONFIG("peer_address", peer_address, IPv4),
145 CONFIG("send_garp", send_garp, BOOL),
146 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
147 CONFIG("throttle_buckets", num_tbfs, INT),
148 CONFIG("accounting_dir", accounting_dir, STRING),
149 CONFIG("dump_speed", dump_speed, BOOL),
150 CONFIG("multi_read_count", multi_read_count, INT),
151 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
152 CONFIG("lock_pages", lock_pages, BOOL),
153 CONFIG("icmp_rate", icmp_rate, INT),
154 CONFIG("packet_limit", max_packets, INT),
155 CONFIG("cluster_address", cluster_address, IPv4),
156 CONFIG("cluster_interface", cluster_interface, STRING),
157 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
158 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
159 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
160 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
161 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
162 CONFIG("cli_bind_address", cli_bind_address, IPv4),
163 CONFIG("hostname", hostname, STRING),
164 CONFIG("nexthop_address", nexthop_address, IPv4),
165 CONFIG("nexthop6_address", nexthop6_address, IPv6),
166 { NULL, 0, 0, 0 },
167 };
168
169 static char *plugin_functions[] = {
170 NULL,
171 "plugin_pre_auth",
172 "plugin_post_auth",
173 "plugin_timer",
174 "plugin_new_session",
175 "plugin_kill_session",
176 "plugin_control",
177 "plugin_radius_response",
178 "plugin_radius_reset",
179 "plugin_radius_account",
180 "plugin_become_master",
181 "plugin_new_session_master",
182 };
183
184 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
185
186 // Counters for shutdown sessions
187 static sessiont shut_acct[8192];
188 static sessionidt shut_acct_n = 0;
189
190 tunnelt *tunnel = NULL; // Array of tunnel structures.
191 bundlet *bundle = NULL; // Array of bundle structures.
192 fragmentationt *frag = NULL; // Array of fragmentation structures.
193 sessiont *session = NULL; // Array of session structures.
194 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
195 radiust *radius = NULL; // Array of radius structures.
196 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
197 ip_filtert *ip_filters = NULL; // Array of named filters.
198 static controlt *controlfree = 0;
199 struct Tstats *_statistics = NULL;
200 #ifdef RINGBUFFER
201 struct Tringbuffer *ringbuffer = NULL;
202 #endif
203
204 static ssize_t netlink_send(struct nlmsghdr *nh);
205 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
206 static void cache_ipmap(in_addr_t ip, sessionidt s);
207 static void uncache_ipmap(in_addr_t ip);
208 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
209 static void free_ip_address(sessionidt s);
210 static void dump_acct_info(int all);
211 static void sighup_handler(int sig);
212 static void shutdown_handler(int sig);
213 static void sigchild_handler(int sig);
214 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
215 static void update_config(void);
216 static void read_config_file(void);
217 static void initplugins(void);
218 static int add_plugin(char *plugin_name);
219 static int remove_plugin(char *plugin_name);
220 static void plugins_done(void);
221 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
222 static tunnelidt new_tunnel(void);
223 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
224 static void bundleclear(bundleidt b);
225
226 // on slaves, alow BGP to withdraw cleanly before exiting
227 #define QUIT_DELAY 5
228
229 // quit actions (master)
230 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
231 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
232
233 // return internal time (10ths since process startup), set f if given
234 // as a side-effect sets time_now, and time_changed
235 static clockt now(double *f)
236 {
237 struct timeval t;
238 gettimeofday(&t, 0);
239 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
240 if (t.tv_sec != time_now)
241 {
242 time_now = t.tv_sec;
243 time_changed++;
244 }
245 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
246 }
247
248 // work out a retry time based on try number
249 // This is a straight bounded exponential backoff.
250 // Maximum re-try time is 32 seconds. (2^5).
251 clockt backoff(uint8_t try)
252 {
253 if (try > 5) try = 5; // max backoff
254 return now(NULL) + 10 * (1 << try);
255 }
256
257
258 //
259 // Log a debug message. Typically called via the LOG macro
260 //
261 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
262 {
263 static char message[65536] = {0};
264 va_list ap;
265
266 #ifdef RINGBUFFER
267 if (ringbuffer)
268 {
269 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
270 ringbuffer->tail = 0;
271 if (ringbuffer->tail == ringbuffer->head)
272 if (++ringbuffer->head >= RINGBUFFER_SIZE)
273 ringbuffer->head = 0;
274
275 ringbuffer->buffer[ringbuffer->tail].level = level;
276 ringbuffer->buffer[ringbuffer->tail].session = s;
277 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
278 va_start(ap, format);
279 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
280 va_end(ap);
281 }
282 #endif
283
284 if (config->debug < level) return;
285
286 va_start(ap, format);
287 vsnprintf(message, sizeof(message), format, ap);
288
289 if (log_stream)
290 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
291 else if (syslog_log)
292 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
293
294 va_end(ap);
295 }
296
297 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
298 {
299 int i, j;
300 const uint8_t *d = data;
301
302 if (config->debug < level) return;
303
304 // No support for _log_hex to syslog
305 if (log_stream)
306 {
307 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
308 setvbuf(log_stream, NULL, _IOFBF, 16384);
309
310 for (i = 0; i < maxsize; )
311 {
312 fprintf(log_stream, "%4X: ", i);
313 for (j = i; j < maxsize && j < (i + 16); j++)
314 {
315 fprintf(log_stream, "%02X ", d[j]);
316 if (j == i + 7)
317 fputs(": ", log_stream);
318 }
319
320 for (; j < i + 16; j++)
321 {
322 fputs(" ", log_stream);
323 if (j == i + 7)
324 fputs(": ", log_stream);
325 }
326
327 fputs(" ", log_stream);
328 for (j = i; j < maxsize && j < (i + 16); j++)
329 {
330 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
331 fputc(d[j], log_stream);
332 else
333 fputc('.', log_stream);
334
335 if (j == i + 7)
336 fputs(" ", log_stream);
337 }
338
339 i = j;
340 fputs("\n", log_stream);
341 }
342
343 fflush(log_stream);
344 setbuf(log_stream, NULL);
345 }
346 }
347
348 // update a counter, accumulating 2^32 wraps
349 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
350 {
351 uint32_t new = *counter + delta;
352 if (new < *counter)
353 (*wrap)++;
354
355 *counter = new;
356 }
357
358 // initialise the random generator
359 static void initrandom(char *source)
360 {
361 static char path[sizeof(config->random_device)] = "*undefined*";
362
363 // reinitialise only if we are forced to do so or if the config has changed
364 if (source && !strncmp(path, source, sizeof(path)))
365 return;
366
367 // close previous source, if any
368 if (rand_fd >= 0)
369 close(rand_fd);
370
371 rand_fd = -1;
372
373 if (source)
374 {
375 // register changes
376 snprintf(path, sizeof(path), "%s", source);
377
378 if (*path == '/')
379 {
380 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
381 if (rand_fd < 0)
382 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
383 path, strerror(errno));
384 }
385 }
386 }
387
388 // fill buffer with random data
389 void random_data(uint8_t *buf, int len)
390 {
391 int n = 0;
392
393 CSTAT(random_data);
394 if (rand_fd >= 0)
395 {
396 n = read(rand_fd, buf, len);
397 if (n >= len) return;
398 if (n < 0)
399 {
400 if (errno != EAGAIN)
401 {
402 LOG(0, 0, 0, "Error reading from random source: %s\n",
403 strerror(errno));
404
405 // fall back to rand()
406 initrandom(NULL);
407 }
408
409 n = 0;
410 }
411 }
412
413 // append missing data
414 while (n < len)
415 // not using the low order bits from the prng stream
416 buf[n++] = (rand() >> 4) & 0xff;
417 }
418
419 // Add a route
420 //
421 // This adds it to the routing table, advertises it
422 // via BGP if enabled, and stuffs it into the
423 // 'sessionbyip' cache.
424 //
425 // 'ip' must be in _host_ order.
426 //
427 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
428 {
429 struct {
430 struct nlmsghdr nh;
431 struct rtmsg rt;
432 char buf[32];
433 } req;
434 int i;
435 in_addr_t n_ip;
436
437 if (!prefixlen) prefixlen = 32;
438
439 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
440
441 memset(&req, 0, sizeof(req));
442
443 if (add)
444 {
445 req.nh.nlmsg_type = RTM_NEWROUTE;
446 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
447 }
448 else
449 {
450 req.nh.nlmsg_type = RTM_DELROUTE;
451 req.nh.nlmsg_flags = NLM_F_REQUEST;
452 }
453
454 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
455
456 req.rt.rtm_family = AF_INET;
457 req.rt.rtm_dst_len = prefixlen;
458 req.rt.rtm_table = RT_TABLE_MAIN;
459 req.rt.rtm_protocol = RTPROT_BOOT; // XXX
460 req.rt.rtm_scope = RT_SCOPE_LINK;
461 req.rt.rtm_type = RTN_UNICAST;
462
463 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
464 n_ip = htonl(ip);
465 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
466 if (gw)
467 {
468 n_ip = htonl(gw);
469 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
470 }
471
472 LOG(1, s, 0, "Route %s %s/%d%s%s\n", add ? "add" : "del",
473 fmtaddr(htonl(ip), 0), prefixlen,
474 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
475
476 if (netlink_send(&req.nh) < 0)
477 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
478
479 #ifdef BGP
480 if (add)
481 bgp_add_route(htonl(ip), prefixlen);
482 else
483 bgp_del_route(htonl(ip), prefixlen);
484 #endif /* BGP */
485
486 // Add/Remove the IPs to the 'sessionbyip' cache.
487 // Note that we add the zero address in the case of
488 // a network route. Roll on CIDR.
489
490 // Note that 's == 0' implies this is the address pool.
491 // We still cache it here, because it will pre-fill
492 // the malloc'ed tree.
493
494 if (s)
495 {
496 if (!add) // Are we deleting a route?
497 s = 0; // Caching the session as '0' is the same as uncaching.
498
499 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
500 cache_ipmap(i, s);
501 }
502 }
503
504 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
505 {
506 struct {
507 struct nlmsghdr nh;
508 struct rtmsg rt;
509 char buf[64];
510 } req;
511 int metric;
512 char ipv6addr[INET6_ADDRSTRLEN];
513
514 if (!config->ipv6_prefix.s6_addr[0])
515 {
516 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
517 return;
518 }
519
520 memset(&req, 0, sizeof(req));
521
522 if (add)
523 {
524 req.nh.nlmsg_type = RTM_NEWROUTE;
525 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
526 }
527 else
528 {
529 req.nh.nlmsg_type = RTM_DELROUTE;
530 req.nh.nlmsg_flags = NLM_F_REQUEST;
531 }
532
533 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
534
535 req.rt.rtm_family = AF_INET6;
536 req.rt.rtm_dst_len = prefixlen;
537 req.rt.rtm_table = RT_TABLE_MAIN;
538 req.rt.rtm_protocol = RTPROT_BOOT; // XXX
539 req.rt.rtm_scope = RT_SCOPE_LINK;
540 req.rt.rtm_type = RTN_UNICAST;
541
542 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
543 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
544 metric = 1;
545 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
546
547 LOG(1, 0, 0, "Route %s %s/%d\n",
548 add ? "add" : "del",
549 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
550 prefixlen);
551
552 if (netlink_send(&req.nh) < 0)
553 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
554
555 #ifdef BGP
556 if (add)
557 bgp_add_route6(ip, prefixlen);
558 else
559 bgp_del_route6(ip, prefixlen);
560 #endif /* BGP */
561
562 if (s)
563 {
564 if (!add) // Are we deleting a route?
565 s = 0; // Caching the session as '0' is the same as uncaching.
566
567 cache_ipv6map(ip, prefixlen, s);
568 }
569
570 return;
571 }
572
573 //
574 // Set up netlink socket
575 static void initnetlink(void)
576 {
577 struct sockaddr_nl nladdr;
578
579 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
580 if (nlfd < 0)
581 {
582 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
583 exit(1);
584 }
585
586 memset(&nladdr, 0, sizeof(nladdr));
587 nladdr.nl_family = AF_NETLINK;
588 nladdr.nl_pid = getpid();
589
590 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
591 {
592 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
593 exit(1);
594 }
595 }
596
597 static ssize_t netlink_send(struct nlmsghdr *nh)
598 {
599 struct sockaddr_nl nladdr;
600 struct iovec iov;
601 struct msghdr msg;
602
603 nh->nlmsg_pid = getpid();
604 nh->nlmsg_seq = ++nlseqnum;
605
606 // set kernel address
607 memset(&nladdr, 0, sizeof(nladdr));
608 nladdr.nl_family = AF_NETLINK;
609
610 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
611 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
612
613 return sendmsg(nlfd, &msg, 0);
614 }
615
616 static ssize_t netlink_recv(void *buf, ssize_t len)
617 {
618 struct sockaddr_nl nladdr;
619 struct iovec iov;
620 struct msghdr msg;
621
622 // set kernel address
623 memset(&nladdr, 0, sizeof(nladdr));
624 nladdr.nl_family = AF_NETLINK;
625
626 iov = (struct iovec){ buf, len };
627 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
628
629 return recvmsg(nlfd, &msg, 0);
630 }
631
632 /* adapted from iproute2 */
633 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
634 {
635 int len = RTA_LENGTH(alen);
636 struct rtattr *rta;
637
638 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
639 rta->rta_type = type;
640 rta->rta_len = len;
641 memcpy(RTA_DATA(rta), data, alen);
642 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
643 }
644
645 // messages corresponding to different phases seq number
646 static char *tun_nl_phase_msg[] = {
647 "initialized",
648 "getting tun interface index",
649 "setting tun interface parameters",
650 "setting tun IPv4 address",
651 "setting tun LL IPv6 address",
652 "setting tun global IPv6 address",
653 };
654
655 //
656 // Set up TUN interface
657 static void inittun(void)
658 {
659 struct ifreq ifr;
660
661 memset(&ifr, 0, sizeof(ifr));
662 ifr.ifr_flags = IFF_TUN;
663
664 tunfd = open(TUNDEVICE, O_RDWR);
665 if (tunfd < 0)
666 { // fatal
667 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
668 exit(1);
669 }
670 {
671 int flags = fcntl(tunfd, F_GETFL, 0);
672 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
673 }
674 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
675 {
676 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
677 exit(1);
678 }
679 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
680 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
681
682 tunidx = if_nametoindex(config->tundevice);
683 if (tunidx == 0)
684 {
685 LOG(0, 0, 0, "Can't get tun interface index\n");
686 exit(1);
687 }
688
689 {
690 struct {
691 // interface setting
692 struct nlmsghdr nh;
693 union {
694 struct ifinfomsg ifinfo;
695 struct ifaddrmsg ifaddr;
696 } ifmsg;
697 char rtdata[32]; // 32 should be enough
698 } req;
699 uint32_t txqlen, mtu;
700 in_addr_t ip;
701
702 memset(&req, 0, sizeof(req));
703
704 req.nh.nlmsg_type = RTM_NEWLINK;
705 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
706 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
707
708 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
709 req.ifmsg.ifinfo.ifi_index = tunidx;
710 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
711 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
712
713 /* Bump up the qlen to deal with bursts from the network */
714 txqlen = 1000;
715 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
716 /* set MTU to modem MRU */
717 mtu = MRU;
718 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
719
720 if (netlink_send(&req.nh) < 0)
721 goto senderror;
722
723 memset(&req, 0, sizeof(req));
724
725 req.nh.nlmsg_type = RTM_NEWADDR;
726 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
727 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
728
729 req.ifmsg.ifaddr.ifa_family = AF_INET;
730 req.ifmsg.ifaddr.ifa_prefixlen = 32;
731 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
732 req.ifmsg.ifaddr.ifa_index = tunidx;
733
734 if (config->bind_address)
735 ip = config->bind_address;
736 else
737 ip = 0x01010101; // 1.1.1.1
738 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
739
740 if (netlink_send(&req.nh) < 0)
741 goto senderror;
742
743 // Only setup IPv6 on the tun device if we have a configured prefix
744 if (config->ipv6_prefix.s6_addr[0]) {
745 struct in6_addr ip6;
746
747 memset(&req, 0, sizeof(req));
748
749 req.nh.nlmsg_type = RTM_NEWADDR;
750 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
751 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
752
753 req.ifmsg.ifaddr.ifa_family = AF_INET6;
754 req.ifmsg.ifaddr.ifa_prefixlen = 64;
755 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
756 req.ifmsg.ifaddr.ifa_index = tunidx;
757
758 // Link local address is FE80::1
759 memset(&ip6, 0, sizeof(ip6));
760 ip6.s6_addr[0] = 0xFE;
761 ip6.s6_addr[1] = 0x80;
762 ip6.s6_addr[15] = 1;
763 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
764
765 if (netlink_send(&req.nh) < 0)
766 goto senderror;
767
768 memset(&req, 0, sizeof(req));
769
770 req.nh.nlmsg_type = RTM_NEWADDR;
771 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
772 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
773
774 req.ifmsg.ifaddr.ifa_family = AF_INET6;
775 req.ifmsg.ifaddr.ifa_prefixlen = 64;
776 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
777 req.ifmsg.ifaddr.ifa_index = tunidx;
778
779 // Global address is prefix::1
780 ip6 = config->ipv6_prefix;
781 ip6.s6_addr[15] = 1;
782 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
783
784 if (netlink_send(&req.nh) < 0)
785 goto senderror;
786 }
787
788 memset(&req, 0, sizeof(req));
789
790 req.nh.nlmsg_type = NLMSG_DONE;
791 req.nh.nlmsg_len = NLMSG_LENGTH(0);
792
793 if (netlink_send(&req.nh) < 0)
794 goto senderror;
795
796 // if we get an error for seqnum < min_initok_nlseqnum,
797 // we must exit as initialization went wrong
798 if (config->ipv6_prefix.s6_addr[0])
799 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
800 else
801 min_initok_nlseqnum = 3 + 1; // idx + if + addr
802 }
803
804 return;
805
806 senderror:
807 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
808 exit(1);
809 }
810
811 // set up UDP ports
812 static void initudp(void)
813 {
814 int on = 1;
815 struct sockaddr_in addr;
816
817 // Tunnel
818 memset(&addr, 0, sizeof(addr));
819 addr.sin_family = AF_INET;
820 addr.sin_port = htons(L2TPPORT);
821 addr.sin_addr.s_addr = config->bind_address;
822 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
823 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
824 {
825 int flags = fcntl(udpfd, F_GETFL, 0);
826 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
827 }
828 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
829 {
830 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
831 exit(1);
832 }
833
834 // Control
835 memset(&addr, 0, sizeof(addr));
836 addr.sin_family = AF_INET;
837 addr.sin_port = htons(NSCTL_PORT);
838 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
839 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
840 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
841 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
842 {
843 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
844 exit(1);
845 }
846
847 // Dynamic Authorization Extensions to RADIUS
848 memset(&addr, 0, sizeof(addr));
849 addr.sin_family = AF_INET;
850 addr.sin_port = htons(config->radius_dae_port);
851 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
852 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
853 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
854 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
855 {
856 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
857 exit(1);
858 }
859
860 // Intercept
861 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
862 }
863
864 //
865 // Find session by IP, < 1 for not found
866 //
867 // Confusingly enough, this 'ip' must be
868 // in _network_ order. This being the common
869 // case when looking it up from IP packet headers.
870 //
871 // We actually use this cache for two things.
872 // #1. For used IP addresses, this maps to the
873 // session ID that it's used by.
874 // #2. For un-used IP addresses, this maps to the
875 // index into the pool table that contains that
876 // IP address.
877 //
878
879 static sessionidt lookup_ipmap(in_addr_t ip)
880 {
881 uint8_t *a = (uint8_t *) &ip;
882 union iphash *h = ip_hash;
883
884 if (!(h = h[*a++].idx)) return 0;
885 if (!(h = h[*a++].idx)) return 0;
886 if (!(h = h[*a++].idx)) return 0;
887
888 return h[*a].sess;
889 }
890
891 static sessionidt lookup_ipv6map(struct in6_addr ip)
892 {
893 struct ipv6radix *curnode;
894 int i;
895 int s;
896 char ipv6addr[INET6_ADDRSTRLEN];
897
898 curnode = &ipv6_hash[ip.s6_addr[0]];
899 i = 1;
900 s = curnode->sess;
901
902 while (s == 0 && i < 15 && curnode->branch != NULL)
903 {
904 curnode = &curnode->branch[ip.s6_addr[i]];
905 s = curnode->sess;
906 i++;
907 }
908
909 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
910 inet_ntop(AF_INET6, &ip, ipv6addr,
911 INET6_ADDRSTRLEN),
912 s);
913
914 return s;
915 }
916
917 sessionidt sessionbyip(in_addr_t ip)
918 {
919 sessionidt s = lookup_ipmap(ip);
920 CSTAT(sessionbyip);
921
922 if (s > 0 && s < MAXSESSION && session[s].opened)
923 return s;
924
925 return 0;
926 }
927
928 sessionidt sessionbyipv6(struct in6_addr ip)
929 {
930 sessionidt s;
931 CSTAT(sessionbyipv6);
932
933 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
934 (ip.s6_addr[0] == 0xFE &&
935 ip.s6_addr[1] == 0x80 &&
936 ip.s6_addr16[1] == 0 &&
937 ip.s6_addr16[2] == 0 &&
938 ip.s6_addr16[3] == 0)) {
939 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
940 } else {
941 s = lookup_ipv6map(ip);
942 }
943
944 if (s > 0 && s < MAXSESSION && session[s].opened)
945 return s;
946
947 return 0;
948 }
949
950 //
951 // Take an IP address in HOST byte order and
952 // add it to the sessionid by IP cache.
953 //
954 // (It's actually cached in network order)
955 //
956 static void cache_ipmap(in_addr_t ip, sessionidt s)
957 {
958 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
959 uint8_t *a = (uint8_t *) &nip;
960 union iphash *h = ip_hash;
961 int i;
962
963 for (i = 0; i < 3; i++)
964 {
965 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
966 return;
967
968 h = h[a[i]].idx;
969 }
970
971 h[a[3]].sess = s;
972
973 if (s > 0)
974 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
975
976 else if (s == 0)
977 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
978 // else a map to an ip pool index.
979 }
980
981 static void uncache_ipmap(in_addr_t ip)
982 {
983 cache_ipmap(ip, 0); // Assign it to the NULL session.
984 }
985
986 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
987 {
988 int i;
989 int bytes;
990 struct ipv6radix *curnode;
991 char ipv6addr[INET6_ADDRSTRLEN];
992
993 curnode = &ipv6_hash[ip.s6_addr[0]];
994
995 bytes = prefixlen >> 3;
996 i = 1;
997 while (i < bytes) {
998 if (curnode->branch == NULL)
999 {
1000 if (!(curnode->branch = calloc(256,
1001 sizeof (struct ipv6radix))))
1002 return;
1003 }
1004 curnode = &curnode->branch[ip.s6_addr[i]];
1005 i++;
1006 }
1007
1008 curnode->sess = s;
1009
1010 if (s > 0)
1011 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1012 inet_ntop(AF_INET6, &ip, ipv6addr,
1013 INET6_ADDRSTRLEN),
1014 prefixlen);
1015 else if (s == 0)
1016 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1017 inet_ntop(AF_INET6, &ip, ipv6addr,
1018 INET6_ADDRSTRLEN),
1019 prefixlen);
1020 }
1021
1022 //
1023 // CLI list to dump current ipcache.
1024 //
1025 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1026 {
1027 union iphash *d = ip_hash, *e, *f, *g;
1028 int i, j, k, l;
1029 int count = 0;
1030
1031 if (CLI_HELP_REQUESTED)
1032 return CLI_HELP_NO_ARGS;
1033
1034 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1035
1036 for (i = 0; i < 256; ++i)
1037 {
1038 if (!d[i].idx)
1039 continue;
1040
1041 e = d[i].idx;
1042 for (j = 0; j < 256; ++j)
1043 {
1044 if (!e[j].idx)
1045 continue;
1046
1047 f = e[j].idx;
1048 for (k = 0; k < 256; ++k)
1049 {
1050 if (!f[k].idx)
1051 continue;
1052
1053 g = f[k].idx;
1054 for (l = 0; l < 256; ++l)
1055 {
1056 if (!g[l].sess)
1057 continue;
1058
1059 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1060 ++count;
1061 }
1062 }
1063 }
1064 }
1065 cli_print(cli, "%d entries in cache", count);
1066 return CLI_OK;
1067 }
1068
1069
1070 // Find session by username, 0 for not found
1071 // walled garden users aren't authenticated, so the username is
1072 // reasonably useless. Ignore them to avoid incorrect actions
1073 //
1074 // This is VERY inefficent. Don't call it often. :)
1075 //
1076 sessionidt sessionbyuser(char *username)
1077 {
1078 int s;
1079 CSTAT(sessionbyuser);
1080
1081 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1082 {
1083 if (!session[s].opened)
1084 continue;
1085
1086 if (session[s].walled_garden)
1087 continue; // Skip walled garden users.
1088
1089 if (!strncmp(session[s].user, username, 128))
1090 return s;
1091
1092 }
1093 return 0; // Not found.
1094 }
1095
1096 void send_garp(in_addr_t ip)
1097 {
1098 int s;
1099 struct ifreq ifr;
1100 uint8_t mac[6];
1101
1102 s = socket(PF_INET, SOCK_DGRAM, 0);
1103 if (s < 0)
1104 {
1105 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1106 return;
1107 }
1108 memset(&ifr, 0, sizeof(ifr));
1109 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1110 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1111 {
1112 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1113 close(s);
1114 return;
1115 }
1116 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1117 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1118 {
1119 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1120 close(s);
1121 return;
1122 }
1123 close(s);
1124 sendarp(ifr.ifr_ifindex, mac, ip);
1125 }
1126
1127 static sessiont *sessiontbysessionidt(sessionidt s)
1128 {
1129 if (!s || s >= MAXSESSION) return NULL;
1130 return &session[s];
1131 }
1132
1133 static sessionidt sessionidtbysessiont(sessiont *s)
1134 {
1135 sessionidt val = s-session;
1136 if (s < session || val >= MAXSESSION) return 0;
1137 return val;
1138 }
1139
1140 // actually send a control message for a specific tunnel
1141 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1142 {
1143 struct sockaddr_in addr;
1144
1145 CSTAT(tunnelsend);
1146
1147 if (!t)
1148 {
1149 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1150 STAT(tunnel_tx_errors);
1151 return;
1152 }
1153
1154 if (!tunnel[t].ip)
1155 {
1156 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1157 STAT(tunnel_tx_errors);
1158 return;
1159 }
1160
1161 memset(&addr, 0, sizeof(addr));
1162 addr.sin_family = AF_INET;
1163 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1164 addr.sin_port = htons(tunnel[t].port);
1165
1166 // sequence expected, if sequence in message
1167 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1168
1169 // If this is a control message, deal with retries
1170 if (*buf & 0x80)
1171 {
1172 tunnel[t].last = time_now; // control message sent
1173 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1174 if (tunnel[t].try)
1175 {
1176 STAT(tunnel_retries);
1177 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1178 }
1179 }
1180
1181 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1182 {
1183 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1184 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1185 STAT(tunnel_tx_errors);
1186 return;
1187 }
1188
1189 LOG_HEX(5, "Send Tunnel Data", buf, l);
1190 STAT(tunnel_tx_packets);
1191 INC_STAT(tunnel_tx_bytes, l);
1192 }
1193
1194 //
1195 // Tiny helper function to write data to
1196 // the 'tun' device.
1197 //
1198 int tun_write(uint8_t * data, int size)
1199 {
1200 return write(tunfd, data, size);
1201 }
1202
1203 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1204 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1205 {
1206 int d = (tcp[12] >> 4) * 4;
1207 uint8_t *mss = 0;
1208 uint8_t *opts;
1209 uint8_t *data;
1210 uint16_t orig;
1211 uint32_t sum;
1212
1213 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1214 return;
1215
1216 if (tcp + d > buf + len) // short?
1217 return;
1218
1219 opts = tcp + 20;
1220 data = tcp + d;
1221
1222 while (opts < data)
1223 {
1224 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1225 {
1226 mss = opts + 2;
1227 if (mss + 2 > data) return; // short?
1228 break;
1229 }
1230
1231 if (*opts == 0) return; // end of options
1232 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1233 opts++;
1234 else
1235 opts += opts[1]; // skip over option
1236 }
1237
1238 if (!mss) return; // not found
1239 orig = ntohs(*(uint16_t *) mss);
1240
1241 if (orig <= MSS) return; // mss OK
1242
1243 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1244 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1245 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1246 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1247
1248 // set mss
1249 *(int16_t *) mss = htons(MSS);
1250
1251 // adjust checksum (see rfc1141)
1252 sum = orig + (~MSS & 0xffff);
1253 sum += ntohs(*(uint16_t *) (tcp + 16));
1254 sum = (sum & 0xffff) + (sum >> 16);
1255 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1256 }
1257
1258 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1259 {
1260 uint16_t proto;
1261 if (extra) {
1262 // Skip the four extra bytes
1263 p += 4;
1264 l -= 4;
1265 }
1266
1267 if (*p & 1)
1268 {
1269 proto = *p++;
1270 l--;
1271 }
1272 else
1273 {
1274 proto = ntohs(*(uint16_t *) p);
1275 p += 2;
1276 l -= 2;
1277 }
1278 if (proto == PPPIP)
1279 {
1280 if (session[s].die)
1281 {
1282 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1283 return; // closing session, PPP not processed
1284 }
1285 session[s].last_packet = session[s].last_data = time_now;
1286 processipin(s, t, p, l);
1287 }
1288 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1289 {
1290 if (session[s].die)
1291 {
1292 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1293 return; // closing session, PPP not processed
1294 }
1295
1296 session[s].last_packet = session[s].last_data = time_now;
1297 processipv6in(s, t, p, l);
1298 }
1299 else if (proto == PPPIPCP)
1300 {
1301 session[s].last_packet = session[s].last_data = time_now;
1302 processipcp(s, t, p, l);
1303 }
1304 else if (proto == PPPCCP)
1305 {
1306 session[s].last_packet = session[s].last_data = time_now;
1307 processccp(s, t, p, l);
1308 }
1309 else
1310 {
1311 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1312 }
1313 }
1314
1315 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1316 {
1317 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1318 sp->cout_delta += len;
1319 sp->pout++;
1320 sp->last_data = time_now;
1321
1322 sess_local[s].cout += len; // To send to master..
1323 sess_local[s].pout++;
1324 }
1325
1326 // process outgoing (to tunnel) IP
1327 //
1328 static void processipout(uint8_t *buf, int len)
1329 {
1330 sessionidt s;
1331 sessiont *sp;
1332 tunnelidt t;
1333 in_addr_t ip;
1334
1335 uint8_t *data = buf; // Keep a copy of the originals.
1336 int size = len;
1337
1338 uint8_t fragbuf[MAXETHER + 20];
1339
1340 CSTAT(processipout);
1341
1342 if (len < MIN_IP_SIZE)
1343 {
1344 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1345 STAT(tun_rx_errors);
1346 return;
1347 }
1348 if (len >= MAXETHER)
1349 {
1350 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1351 STAT(tun_rx_errors);
1352 return;
1353 }
1354
1355 // Skip the tun header
1356 buf += 4;
1357 len -= 4;
1358
1359 // Got an IP header now
1360 if (*(uint8_t *)(buf) >> 4 != 4)
1361 {
1362 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1363 return;
1364 }
1365
1366 ip = *(uint32_t *)(buf + 16);
1367 if (!(s = sessionbyip(ip)))
1368 {
1369 // Is this a packet for a session that doesn't exist?
1370 static int rate = 0; // Number of ICMP packets we've sent this second.
1371 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1372
1373 if (last != time_now)
1374 {
1375 last = time_now;
1376 rate = 0;
1377 }
1378
1379 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1380 {
1381 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1382 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1383 config->bind_address ? config->bind_address : my_address, buf, len);
1384 }
1385 return;
1386 }
1387
1388 t = session[s].tunnel;
1389 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1390 {
1391 LOG(3, s, t, "Packet size more than session MRU\n");
1392 return;
1393 }
1394
1395 sp = &session[s];
1396
1397 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1398 if (config->max_packets > 0)
1399 {
1400 if (sess_local[s].last_packet_out == TIME)
1401 {
1402 int max = config->max_packets;
1403
1404 // All packets for throttled sessions are handled by the
1405 // master, so further limit by using the throttle rate.
1406 // A bit of a kludge, since throttle rate is in kbps,
1407 // but should still be generous given our average DSL
1408 // packet size is 200 bytes: a limit of 28kbps equates
1409 // to around 180 packets per second.
1410 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1411 max = sp->throttle_out;
1412
1413 if (++sess_local[s].packets_out > max)
1414 {
1415 sess_local[s].packets_dropped++;
1416 return;
1417 }
1418 }
1419 else
1420 {
1421 if (sess_local[s].packets_dropped)
1422 {
1423 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1424 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1425 sess_local[s].packets_dropped, sess_local[s].packets_out,
1426 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1427 sp->user);
1428 }
1429
1430 sess_local[s].last_packet_out = TIME;
1431 sess_local[s].packets_out = 1;
1432 sess_local[s].packets_dropped = 0;
1433 }
1434 }
1435
1436 // run access-list if any
1437 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1438 return;
1439
1440 // adjust MSS on SYN and SYN,ACK packets with options
1441 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1442 {
1443 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1444 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1445 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1446 }
1447
1448 if (sp->tbf_out)
1449 {
1450 // Are we throttling this session?
1451 if (config->cluster_iam_master)
1452 tbf_queue_packet(sp->tbf_out, data, size);
1453 else
1454 master_throttle_packet(sp->tbf_out, data, size);
1455 return;
1456 }
1457
1458 if (sp->walled_garden && !config->cluster_iam_master)
1459 {
1460 // We are walled-gardening this
1461 master_garden_packet(s, data, size);
1462 return;
1463 }
1464
1465 // Add on L2TP header
1466 {
1467 bundleidt bid = 0;
1468 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1469 {
1470 bid = session[s].bundle;
1471 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1472 t = session[s].tunnel;
1473 sp = &session[s];
1474 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1475 if(len > MINFRAGLEN)
1476 {
1477 // Partition the packet to "bundle[b].num_of_links" fragments
1478 bundlet *b = &bundle[bid];
1479 uint32_t num_of_links = b->num_of_links;
1480 uint32_t fraglen = len / num_of_links;
1481 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1482 uint32_t last_fraglen = fraglen + len % num_of_links;
1483 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1484 uint32_t remain = len;
1485
1486 // send the first packet
1487 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1488 if (!p) return;
1489 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1490 // statistics
1491 update_session_out_stat(s, sp, fraglen);
1492 remain -= fraglen;
1493 while (remain > last_fraglen)
1494 {
1495 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1496 t = session[s].tunnel;
1497 sp = &session[s];
1498 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1499 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1500 if (!p) return;
1501 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1502 update_session_out_stat(s, sp, fraglen);
1503 remain -= fraglen;
1504 }
1505 // send the last fragment
1506 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1507 t = session[s].tunnel;
1508 sp = &session[s];
1509 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1510 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1511 if (!p) return;
1512 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1513 update_session_out_stat(s, sp, remain);
1514 if (remain != last_fraglen)
1515 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1516 }
1517 else {
1518 // Send it as one frame
1519 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1520 if (!p) return;
1521 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1522 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1523 update_session_out_stat(s, sp, len);
1524 }
1525 }
1526 else
1527 {
1528 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1529 if (!p) return;
1530 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1531 update_session_out_stat(s, sp, len);
1532 }
1533 }
1534
1535 // Snooping this session, send it to intercept box
1536 if (sp->snoop_ip && sp->snoop_port)
1537 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1538
1539 udp_tx += len;
1540 }
1541
1542 // process outgoing (to tunnel) IPv6
1543 //
1544 static void processipv6out(uint8_t * buf, int len)
1545 {
1546 sessionidt s;
1547 sessiont *sp;
1548 tunnelidt t;
1549 in_addr_t ip;
1550 struct in6_addr ip6;
1551
1552 uint8_t *data = buf; // Keep a copy of the originals.
1553 int size = len;
1554
1555 uint8_t b[MAXETHER + 20];
1556
1557 CSTAT(processipv6out);
1558
1559 if (len < MIN_IP_SIZE)
1560 {
1561 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1562 STAT(tunnel_tx_errors);
1563 return;
1564 }
1565 if (len >= MAXETHER)
1566 {
1567 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1568 STAT(tunnel_tx_errors);
1569 return;
1570 }
1571
1572 // Skip the tun header
1573 buf += 4;
1574 len -= 4;
1575
1576 // Got an IP header now
1577 if (*(uint8_t *)(buf) >> 4 != 6)
1578 {
1579 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1580 return;
1581 }
1582
1583 ip6 = *(struct in6_addr *)(buf+24);
1584 s = sessionbyipv6(ip6);
1585
1586 if (s == 0)
1587 {
1588 ip = *(uint32_t *)(buf + 32);
1589 s = sessionbyip(ip);
1590 }
1591
1592 if (s == 0)
1593 {
1594 // Is this a packet for a session that doesn't exist?
1595 static int rate = 0; // Number of ICMP packets we've sent this second.
1596 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1597
1598 if (last != time_now)
1599 {
1600 last = time_now;
1601 rate = 0;
1602 }
1603
1604 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1605 {
1606 // FIXME: Should send icmp6 host unreachable
1607 }
1608 return;
1609 }
1610 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1611 {
1612 bundleidt bid = session[s].bundle;
1613 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1614 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1615 }
1616 t = session[s].tunnel;
1617 sp = &session[s];
1618 sp->last_data = time_now;
1619
1620 // FIXME: add DoS prevention/filters?
1621
1622 if (sp->tbf_out)
1623 {
1624 // Are we throttling this session?
1625 if (config->cluster_iam_master)
1626 tbf_queue_packet(sp->tbf_out, data, size);
1627 else
1628 master_throttle_packet(sp->tbf_out, data, size);
1629 return;
1630 }
1631 else if (sp->walled_garden && !config->cluster_iam_master)
1632 {
1633 // We are walled-gardening this
1634 master_garden_packet(s, data, size);
1635 return;
1636 }
1637
1638 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1639
1640 // Add on L2TP header
1641 {
1642 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1643 if (!p) return;
1644 tunnelsend(b, len + (p-b), t); // send it...
1645 }
1646
1647 // Snooping this session, send it to intercept box
1648 if (sp->snoop_ip && sp->snoop_port)
1649 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1650
1651 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1652 sp->cout_delta += len;
1653 sp->pout++;
1654 udp_tx += len;
1655
1656 sess_local[s].cout += len; // To send to master..
1657 sess_local[s].pout++;
1658 }
1659
1660 //
1661 // Helper routine for the TBF filters.
1662 // Used to send queued data in to the user!
1663 //
1664 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1665 {
1666 sessiont *sp;
1667 tunnelidt t;
1668 in_addr_t ip;
1669
1670 uint8_t b[MAXETHER + 20];
1671
1672 if (len < 0 || len > MAXETHER)
1673 {
1674 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1675 return;
1676 }
1677
1678 // Skip the tun header
1679 buf += 4;
1680 len -= 4;
1681
1682 ip = *(in_addr_t *)(buf + 16);
1683
1684 if (!session[s].ip)
1685 return;
1686
1687 t = session[s].tunnel;
1688 sp = &session[s];
1689
1690 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1691
1692 // Add on L2TP header
1693 {
1694 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1695 if (!p) return;
1696 tunnelsend(b, len + (p-b), t); // send it...
1697 }
1698
1699 // Snooping this session.
1700 if (sp->snoop_ip && sp->snoop_port)
1701 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1702
1703 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1704 sp->cout_delta += len;
1705 sp->pout++;
1706 udp_tx += len;
1707
1708 sess_local[s].cout += len; // To send to master..
1709 sess_local[s].pout++;
1710 }
1711
1712 // add an AVP (16 bit)
1713 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1714 {
1715 uint16_t l = (m ? 0x8008 : 0x0008);
1716 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1717 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1718 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1719 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1720 c->length += 8;
1721 }
1722
1723 // add an AVP (32 bit)
1724 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1725 {
1726 uint16_t l = (m ? 0x800A : 0x000A);
1727 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1728 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1729 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1730 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1731 c->length += 10;
1732 }
1733
1734 // add an AVP (string)
1735 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1736 {
1737 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1738 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1739 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1740 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1741 memcpy(c->buf + c->length + 6, val, strlen(val));
1742 c->length += 6 + strlen(val);
1743 }
1744
1745 // add a binary AVP
1746 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1747 {
1748 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1749 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1750 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1751 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1752 memcpy(c->buf + c->length + 6, val, len);
1753 c->length += 6 + len;
1754 }
1755
1756 // new control connection
1757 static controlt *controlnew(uint16_t mtype)
1758 {
1759 controlt *c;
1760 if (!controlfree)
1761 c = malloc(sizeof(controlt));
1762 else
1763 {
1764 c = controlfree;
1765 controlfree = c->next;
1766 }
1767 assert(c);
1768 c->next = 0;
1769 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1770 c->length = 12;
1771 control16(c, 0, mtype, 1);
1772 return c;
1773 }
1774
1775 // send zero block if nothing is waiting
1776 // (ZLB send).
1777 static void controlnull(tunnelidt t)
1778 {
1779 uint8_t buf[12];
1780 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1781 return;
1782
1783 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1784 *(uint16_t *) (buf + 2) = htons(12); // length
1785 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1786 *(uint16_t *) (buf + 6) = htons(0); // session
1787 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1788 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1789 tunnelsend(buf, 12, t);
1790 }
1791
1792 // add a control message to a tunnel, and send if within window
1793 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1794 {
1795 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1796 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1797 *(uint16_t *) (c->buf + 6) = htons(far); // session
1798 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1799 tunnel[t].ns++; // advance sequence
1800 // link in message in to queue
1801 if (tunnel[t].controlc)
1802 tunnel[t].controle->next = c;
1803 else
1804 tunnel[t].controls = c;
1805
1806 tunnel[t].controle = c;
1807 tunnel[t].controlc++;
1808
1809 // send now if space in window
1810 if (tunnel[t].controlc <= tunnel[t].window)
1811 {
1812 tunnel[t].try = 0; // first send
1813 tunnelsend(c->buf, c->length, t);
1814 }
1815 }
1816
1817 //
1818 // Throttle or Unthrottle a session
1819 //
1820 // Throttle the data from/to through a session to no more than
1821 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1822 // user).
1823 //
1824 // If either value is -1, the current value is retained for that
1825 // direction.
1826 //
1827 void throttle_session(sessionidt s, int rate_in, int rate_out)
1828 {
1829 if (!session[s].opened)
1830 return; // No-one home.
1831
1832 if (!*session[s].user)
1833 return; // User not logged in
1834
1835 if (rate_in >= 0)
1836 {
1837 int bytes = rate_in * 1024 / 8; // kbits to bytes
1838 if (session[s].tbf_in)
1839 free_tbf(session[s].tbf_in);
1840
1841 if (rate_in > 0)
1842 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1843 else
1844 session[s].tbf_in = 0;
1845
1846 session[s].throttle_in = rate_in;
1847 }
1848
1849 if (rate_out >= 0)
1850 {
1851 int bytes = rate_out * 1024 / 8;
1852 if (session[s].tbf_out)
1853 free_tbf(session[s].tbf_out);
1854
1855 if (rate_out > 0)
1856 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1857 else
1858 session[s].tbf_out = 0;
1859
1860 session[s].throttle_out = rate_out;
1861 }
1862 }
1863
1864 // add/remove filters from session (-1 = no change)
1865 void filter_session(sessionidt s, int filter_in, int filter_out)
1866 {
1867 if (!session[s].opened)
1868 return; // No-one home.
1869
1870 if (!*session[s].user)
1871 return; // User not logged in
1872
1873 // paranoia
1874 if (filter_in > MAXFILTER) filter_in = -1;
1875 if (filter_out > MAXFILTER) filter_out = -1;
1876 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1877 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1878
1879 if (filter_in >= 0)
1880 {
1881 if (session[s].filter_in)
1882 ip_filters[session[s].filter_in - 1].used--;
1883
1884 if (filter_in > 0)
1885 ip_filters[filter_in - 1].used++;
1886
1887 session[s].filter_in = filter_in;
1888 }
1889
1890 if (filter_out >= 0)
1891 {
1892 if (session[s].filter_out)
1893 ip_filters[session[s].filter_out - 1].used--;
1894
1895 if (filter_out > 0)
1896 ip_filters[filter_out - 1].used++;
1897
1898 session[s].filter_out = filter_out;
1899 }
1900 }
1901
1902 // start tidy shutdown of session
1903 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1904 {
1905 int walled_garden = session[s].walled_garden;
1906 bundleidt b = session[s].bundle;
1907 //delete routes only for last session in bundle (in case of MPPP)
1908 int del_routes = !b || (bundle[b].num_of_links == 1);
1909
1910 CSTAT(sessionshutdown);
1911
1912 if (!session[s].opened)
1913 {
1914 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1915 return; // not a live session
1916 }
1917
1918 if (!session[s].die)
1919 {
1920 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1921 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1922 run_plugins(PLUGIN_KILL_SESSION, &data);
1923 session[s].die = TIME + 150; // Clean up in 15 seconds
1924 }
1925
1926 if (session[s].ip && !walled_garden && !session[s].die)
1927 {
1928 // RADIUS Stop message
1929 uint16_t r = radiusnew(s);
1930 if (r)
1931 {
1932 // stop, if not already trying
1933 if (radius[r].state != RADIUSSTOP)
1934 {
1935 radius[r].term_cause = term_cause;
1936 radius[r].term_msg = reason;
1937 radiussend(r, RADIUSSTOP);
1938 }
1939 }
1940 else
1941 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1942
1943 // Save counters to dump to accounting file
1944 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1945 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1946 }
1947
1948 if (session[s].ip)
1949 { // IP allocated, clear and unroute
1950 int r;
1951 int routed = 0;
1952 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1953 {
1954 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
1955 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
1956 routed++;
1957
1958 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
1959 session[s].route[r].ip = 0;
1960 }
1961
1962 if (session[s].ip_pool_index == -1) // static ip
1963 {
1964 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1965 session[s].ip = 0;
1966 }
1967 else
1968 free_ip_address(s);
1969
1970 // unroute IPv6, if setup
1971 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1972 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1973
1974 if (b)
1975 {
1976 // This session was part of a bundle
1977 bundle[b].num_of_links--;
1978 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1979 if(bundle[b].num_of_links == 0)
1980 {
1981 bundleclear(b);
1982 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1983 }
1984 else
1985 {
1986 // Adjust the members array to accomodate the new change
1987 uint8_t mem_num = 0;
1988 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1989 if(bundle[b].members[bundle[b].num_of_links] != s)
1990 {
1991 uint8_t ml;
1992 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1993 if(bundle[b].members[ml] == s)
1994 {
1995 mem_num = ml;
1996 break;
1997 }
1998 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1999 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
2000 }
2001 }
2002 cluster_send_bundle(b);
2003 }
2004 }
2005
2006 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2007 throttle_session(s, 0, 0);
2008
2009 if (cdn_result)
2010 { // Send CDN
2011 controlt *c = controlnew(14); // sending CDN
2012 if (cdn_error)
2013 {
2014 uint8_t buf[4];
2015 *(uint16_t *) buf = htons(cdn_result);
2016 *(uint16_t *) (buf+2) = htons(cdn_error);
2017 controlb(c, 1, buf, 4, 1);
2018 }
2019 else
2020 control16(c, 1, cdn_result, 1);
2021
2022 control16(c, 14, s, 1); // assigned session (our end)
2023 controladd(c, session[s].far, session[s].tunnel); // send the message
2024 }
2025
2026 // update filter refcounts
2027 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2028 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2029
2030 // clear PPP state
2031 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2032 sess_local[s].lcp.restart = 0;
2033 sess_local[s].ipcp.restart = 0;
2034 sess_local[s].ipv6cp.restart = 0;
2035 sess_local[s].ccp.restart = 0;
2036
2037 cluster_send_session(s);
2038 }
2039
2040 void sendipcp(sessionidt s, tunnelidt t)
2041 {
2042 uint8_t buf[MAXETHER];
2043 uint8_t *q;
2044
2045 CSTAT(sendipcp);
2046 LOG(3, s, t, "IPCP: send ConfigReq\n");
2047
2048 if (!session[s].unique_id)
2049 {
2050 if (!++last_id) ++last_id; // skip zero
2051 session[s].unique_id = last_id;
2052 }
2053
2054 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2055 if (!q) return;
2056
2057 *q = ConfigReq;
2058 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2059 *(uint16_t *) (q + 2) = htons(10); // packet length
2060 q[4] = 3; // ip address option
2061 q[5] = 6; // option length
2062 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2063 config->bind_address ? config->bind_address :
2064 my_address; // send my IP
2065
2066 tunnelsend(buf, 10 + (q - buf), t); // send it
2067 restart_timer(s, ipcp);
2068 }
2069
2070 void sendipv6cp(sessionidt s, tunnelidt t)
2071 {
2072 uint8_t buf[MAXETHER];
2073 uint8_t *q;
2074
2075 CSTAT(sendipv6cp);
2076 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2077
2078 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2079 if (!q) return;
2080
2081 *q = ConfigReq;
2082 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2083 // only send one type
2084 // of request
2085 *(uint16_t *) (q + 2) = htons(14);
2086 q[4] = 1; // interface identifier option
2087 q[5] = 10; // option length
2088 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2089 *(uint32_t *) (q + 10) = 0;
2090 q[13] = 1;
2091
2092 tunnelsend(buf, 14 + (q - buf), t); // send it
2093 restart_timer(s, ipv6cp);
2094 }
2095
2096 static void sessionclear(sessionidt s)
2097 {
2098 memset(&session[s], 0, sizeof(session[s]));
2099 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2100 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2101
2102 session[s].tunnel = T_FREE; // Mark it as free.
2103 session[s].next = sessionfree;
2104 sessionfree = s;
2105 }
2106
2107 // kill a session now
2108 void sessionkill(sessionidt s, char *reason)
2109 {
2110 CSTAT(sessionkill);
2111
2112 if (!session[s].opened) // not alive
2113 return;
2114
2115 if (session[s].next)
2116 {
2117 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2118 return;
2119 }
2120
2121 if (!session[s].die)
2122 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2123
2124 if (sess_local[s].radius)
2125 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2126
2127 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2128 sessionclear(s);
2129 cluster_send_session(s);
2130 }
2131
2132 static void tunnelclear(tunnelidt t)
2133 {
2134 if (!t) return;
2135 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2136 tunnel[t].state = TUNNELFREE;
2137 }
2138
2139 static void bundleclear(bundleidt b)
2140 {
2141 if (!b) return;
2142 memset(&bundle[b], 0, sizeof(bundle[b]));
2143 bundle[b].state = BUNDLEFREE;
2144 }
2145
2146 // kill a tunnel now
2147 static void tunnelkill(tunnelidt t, char *reason)
2148 {
2149 sessionidt s;
2150 controlt *c;
2151
2152 CSTAT(tunnelkill);
2153
2154 tunnel[t].state = TUNNELDIE;
2155
2156 // free control messages
2157 while ((c = tunnel[t].controls))
2158 {
2159 controlt * n = c->next;
2160 tunnel[t].controls = n;
2161 tunnel[t].controlc--;
2162 c->next = controlfree;
2163 controlfree = c;
2164 }
2165 // kill sessions
2166 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2167 if (session[s].tunnel == t)
2168 sessionkill(s, reason);
2169
2170 // free tunnel
2171 tunnelclear(t);
2172 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2173 cli_tunnel_actions[t].action = 0;
2174 cluster_send_tunnel(t);
2175 }
2176
2177 // shut down a tunnel cleanly
2178 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2179 {
2180 sessionidt s;
2181
2182 CSTAT(tunnelshutdown);
2183
2184 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2185 {
2186 // never set up, can immediately kill
2187 tunnelkill(t, reason);
2188 return;
2189 }
2190 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2191
2192 // close session
2193 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2194 if (session[s].tunnel == t)
2195 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2196
2197 tunnel[t].state = TUNNELDIE;
2198 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2199 cluster_send_tunnel(t);
2200 // TBA - should we wait for sessions to stop?
2201 if (result)
2202 {
2203 controlt *c = controlnew(4); // sending StopCCN
2204 if (error)
2205 {
2206 uint8_t buf[64];
2207 int l = 4;
2208 *(uint16_t *) buf = htons(result);
2209 *(uint16_t *) (buf+2) = htons(error);
2210 if (msg)
2211 {
2212 int m = strlen(msg);
2213 if (m + 4 > sizeof(buf))
2214 m = sizeof(buf) - 4;
2215
2216 memcpy(buf+4, msg, m);
2217 l += m;
2218 }
2219
2220 controlb(c, 1, buf, l, 1);
2221 }
2222 else
2223 control16(c, 1, result, 1);
2224
2225 control16(c, 9, t, 1); // assigned tunnel (our end)
2226 controladd(c, 0, t); // send the message
2227 }
2228 }
2229
2230 // read and process packet on tunnel (UDP)
2231 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2232 {
2233 uint8_t *chapresponse = NULL;
2234 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2235 uint8_t *p = buf + 2;
2236
2237
2238 CSTAT(processudp);
2239
2240 udp_rx += len;
2241 udp_rx_pkt++;
2242 LOG_HEX(5, "UDP Data", buf, len);
2243 STAT(tunnel_rx_packets);
2244 INC_STAT(tunnel_rx_bytes, len);
2245 if (len < 6)
2246 {
2247 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2248 STAT(tunnel_rx_errors);
2249 return;
2250 }
2251 if ((buf[1] & 0x0F) != 2)
2252 {
2253 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2254 STAT(tunnel_rx_errors);
2255 return;
2256 }
2257 if (*buf & 0x40)
2258 { // length
2259 l = ntohs(*(uint16_t *) p);
2260 p += 2;
2261 }
2262 t = ntohs(*(uint16_t *) p);
2263 p += 2;
2264 s = ntohs(*(uint16_t *) p);
2265 p += 2;
2266 if (s >= MAXSESSION)
2267 {
2268 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2269 STAT(tunnel_rx_errors);
2270 return;
2271 }
2272 if (t >= MAXTUNNEL)
2273 {
2274 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2275 STAT(tunnel_rx_errors);
2276 return;
2277 }
2278 if (*buf & 0x08)
2279 { // ns/nr
2280 ns = ntohs(*(uint16_t *) p);
2281 p += 2;
2282 nr = ntohs(*(uint16_t *) p);
2283 p += 2;
2284 }
2285 if (*buf & 0x02)
2286 { // offset
2287 uint16_t o = ntohs(*(uint16_t *) p);
2288 p += o + 2;
2289 }
2290 if ((p - buf) > l)
2291 {
2292 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2293 STAT(tunnel_rx_errors);
2294 return;
2295 }
2296 l -= (p - buf);
2297
2298 // used to time out old tunnels
2299 if (t && tunnel[t].state == TUNNELOPEN)
2300 tunnel[t].lastrec = time_now;
2301
2302 if (*buf & 0x80)
2303 { // control
2304 uint16_t message = 0xFFFF; // message type
2305 uint8_t fatal = 0;
2306 uint8_t mandatory = 0;
2307 uint16_t asession = 0; // assigned session
2308 uint32_t amagic = 0; // magic number
2309 uint8_t aflags = 0; // flags from last LCF
2310 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2311 char called[MAXTEL] = ""; // called number
2312 char calling[MAXTEL] = ""; // calling number
2313
2314 if (!config->cluster_iam_master)
2315 {
2316 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2317 return;
2318 }
2319
2320 // control messages must have bits 0x80|0x40|0x08
2321 // (type, length and sequence) set, and bits 0x02|0x01
2322 // (offset and priority) clear
2323 if ((*buf & 0xCB) != 0xC8)
2324 {
2325 LOG(1, s, t, "Bad control header %02X\n", *buf);
2326 STAT(tunnel_rx_errors);
2327 return;
2328 }
2329
2330 // check for duplicate tunnel open message
2331 if (!t && ns == 0)
2332 {
2333 int i;
2334
2335 //
2336 // Is this a duplicate of the first packet? (SCCRQ)
2337 //
2338 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2339 {
2340 if (tunnel[i].state != TUNNELOPENING ||
2341 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2342 tunnel[i].port != ntohs(addr->sin_port) )
2343 continue;
2344 t = i;
2345 LOG(3, s, t, "Duplicate SCCRQ?\n");
2346 break;
2347 }
2348 }
2349
2350 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2351 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2352
2353 // if no tunnel specified, assign one
2354 if (!t)
2355 {
2356 if (!(t = new_tunnel()))
2357 {
2358 LOG(1, 0, 0, "No more tunnels\n");
2359 STAT(tunnel_overflow);
2360 return;
2361 }
2362 tunnelclear(t);
2363 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2364 tunnel[t].port = ntohs(addr->sin_port);
2365 tunnel[t].window = 4; // default window
2366 STAT(tunnel_created);
2367 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2368 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2369 }
2370
2371 // If the 'ns' just received is not the 'nr' we're
2372 // expecting, just send an ack and drop it.
2373 //
2374 // if 'ns' is less, then we got a retransmitted packet.
2375 // if 'ns' is greater than missed a packet. Either way
2376 // we should ignore it.
2377 if (ns != tunnel[t].nr)
2378 {
2379 // is this the sequence we were expecting?
2380 STAT(tunnel_rx_errors);
2381 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2382 t, ns, tunnel[t].nr);
2383
2384 if (l) // Is this not a ZLB?
2385 controlnull(t);
2386 return;
2387 }
2388
2389 // check sequence of this message
2390 {
2391 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2392 // some to clear maybe?
2393 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2394 {
2395 controlt *c = tunnel[t].controls;
2396 tunnel[t].controls = c->next;
2397 tunnel[t].controlc--;
2398 c->next = controlfree;
2399 controlfree = c;
2400 skip--;
2401 tunnel[t].try = 0; // we have progress
2402 }
2403
2404 // receiver advance (do here so quoted correctly in any sends below)
2405 if (l) tunnel[t].nr = (ns + 1);
2406 if (skip < 0) skip = 0;
2407 if (skip < tunnel[t].controlc)
2408 {
2409 // some control packets can now be sent that were previous stuck out of window
2410 int tosend = tunnel[t].window - skip;
2411 controlt *c = tunnel[t].controls;
2412 while (c && skip)
2413 {
2414 c = c->next;
2415 skip--;
2416 }
2417 while (c && tosend)
2418 {
2419 tunnel[t].try = 0; // first send
2420 tunnelsend(c->buf, c->length, t);
2421 c = c->next;
2422 tosend--;
2423 }
2424 }
2425 if (!tunnel[t].controlc)
2426 tunnel[t].retry = 0; // caught up
2427 }
2428 if (l)
2429 { // if not a null message
2430 int result = 0;
2431 int error = 0;
2432 char *msg = 0;
2433
2434 // Default disconnect cause/message on receipt of CDN. Set to
2435 // more specific value from attribute 1 (result code) or 46
2436 // (disconnect cause) if present below.
2437 int disc_cause_set = 0;
2438 int disc_cause = TERM_NAS_REQUEST;
2439 char const *disc_reason = "Closed (Received CDN).";
2440
2441 // process AVPs
2442 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2443 {
2444 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2445 uint8_t *b = p;
2446 uint8_t flags = *p;
2447 uint16_t mtype;
2448
2449 if (n > l)
2450 {
2451 LOG(1, s, t, "Invalid length in AVP\n");
2452 STAT(tunnel_rx_errors);
2453 return;
2454 }
2455 p += n; // next
2456 l -= n;
2457 if (flags & 0x3C) // reserved bits, should be clear
2458 {
2459 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2460 fatal = flags;
2461 result = 2; // general error
2462 error = 3; // reserved field non-zero
2463 msg = 0;
2464 continue; // next
2465 }
2466 b += 2;
2467 if (*(uint16_t *) (b))
2468 {
2469 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2470 fatal = flags;
2471 result = 2; // general error
2472 error = 6; // generic vendor-specific error
2473 msg = "unsupported vendor-specific";
2474 continue; // next
2475 }
2476 b += 2;
2477 mtype = ntohs(*(uint16_t *) (b));
2478 b += 2;
2479 n -= 6;
2480
2481 if (flags & 0x40)
2482 {
2483 uint16_t orig_len;
2484
2485 // handle hidden AVPs
2486 if (!*config->l2tp_secret)
2487 {
2488 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2489 fatal = flags;
2490 result = 2; // general error
2491 error = 6; // generic vendor-specific error
2492 msg = "secret not specified";
2493 continue;
2494 }
2495 if (!session[s].random_vector_length)
2496 {
2497 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2498 fatal = flags;
2499 result = 2; // general error
2500 error = 6; // generic
2501 msg = "no random vector";
2502 continue;
2503 }
2504 if (n < 8)
2505 {
2506 LOG(2, s, t, "Short hidden AVP.\n");
2507 fatal = flags;
2508 result = 2; // general error
2509 error = 2; // length is wrong
2510 msg = 0;
2511 continue;
2512 }
2513
2514 // Unhide the AVP
2515 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2516
2517 orig_len = ntohs(*(uint16_t *) b);
2518 if (orig_len > n + 2)
2519 {
2520 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2521 orig_len, n);
2522
2523 fatal = flags;
2524 result = 2; // general error
2525 error = 2; // length is wrong
2526 msg = 0;
2527 continue;
2528 }
2529
2530 b += 2;
2531 n = orig_len;
2532 }
2533
2534 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2535 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2536
2537 switch (mtype)
2538 {
2539 case 0: // message type
2540 message = ntohs(*(uint16_t *) b);
2541 mandatory = flags & 0x80;
2542 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2543 break;
2544 case 1: // result code
2545 {
2546 uint16_t rescode = ntohs(*(uint16_t *) b);
2547 char const *resdesc = "(unknown)";
2548 char const *errdesc = NULL;
2549 int cause = 0;
2550
2551 if (message == 4)
2552 { /* StopCCN */
2553 resdesc = l2tp_stopccn_result_code(rescode);
2554 cause = TERM_LOST_SERVICE;
2555 }
2556 else if (message == 14)
2557 { /* CDN */
2558 resdesc = l2tp_cdn_result_code(rescode);
2559 if (rescode == 1)
2560 cause = TERM_LOST_CARRIER;
2561 else
2562 cause = TERM_ADMIN_RESET;
2563 }
2564
2565 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2566 if (n >= 4)
2567 {
2568 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2569 errdesc = l2tp_error_code(errcode);
2570 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2571 }
2572 if (n > 4)
2573 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2574
2575 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2576 {
2577 disc_cause_set = mtype;
2578 disc_reason = errdesc ? errdesc : resdesc;
2579 disc_cause = cause;
2580 }
2581
2582 break;
2583 }
2584 break;
2585 case 2: // protocol version
2586 {
2587 version = ntohs(*(uint16_t *) (b));
2588 LOG(4, s, t, " Protocol version = %u\n", version);
2589 if (version && version != 0x0100)
2590 { // allow 0.0 and 1.0
2591 LOG(1, s, t, " Bad protocol version %04X\n", version);
2592 fatal = flags;
2593 result = 5; // unspported protocol version
2594 error = 0x0100; // supported version
2595 msg = 0;
2596 continue; // next
2597 }
2598 }
2599 break;
2600 case 3: // framing capabilities
2601 break;
2602 case 4: // bearer capabilities
2603 break;
2604 case 5: // tie breaker
2605 // We never open tunnels, so we don't care about tie breakers
2606 continue;
2607 case 6: // firmware revision
2608 break;
2609 case 7: // host name
2610 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2611 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2612 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2613 // TBA - to send to RADIUS
2614 break;
2615 case 8: // vendor name
2616 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2617 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2618 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2619 break;
2620 case 9: // assigned tunnel
2621 tunnel[t].far = ntohs(*(uint16_t *) (b));
2622 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2623 break;
2624 case 10: // rx window
2625 tunnel[t].window = ntohs(*(uint16_t *) (b));
2626 if (!tunnel[t].window)
2627 tunnel[t].window = 1; // window of 0 is silly
2628 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2629 break;
2630 case 11: // Challenge
2631 {
2632 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2633 build_chap_response(b, 2, n, &chapresponse);
2634 }
2635 break;
2636 case 13: // Response
2637 // Why did they send a response? We never challenge.
2638 LOG(2, s, t, " received unexpected challenge response\n");
2639 break;
2640
2641 case 14: // assigned session
2642 asession = session[s].far = ntohs(*(uint16_t *) (b));
2643 LOG(4, s, t, " assigned session = %u\n", asession);
2644 break;
2645 case 15: // call serial number
2646 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2647 break;
2648 case 18: // bearer type
2649 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2650 // TBA - for RADIUS
2651 break;
2652 case 19: // framing type
2653 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2654 // TBA
2655 break;
2656 case 21: // called number
2657 memset(called, 0, sizeof(called));
2658 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2659 LOG(4, s, t, " Called <%s>\n", called);
2660 break;
2661 case 22: // calling number
2662 memset(calling, 0, sizeof(calling));
2663 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2664 LOG(4, s, t, " Calling <%s>\n", calling);
2665 break;
2666 case 23: // subtype
2667 break;
2668 case 24: // tx connect speed
2669 if (n == 4)
2670 {
2671 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2672 }
2673 else
2674 {
2675 // AS5300s send connect speed as a string
2676 char tmp[30];
2677 memset(tmp, 0, sizeof(tmp));
2678 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2679 session[s].tx_connect_speed = atol(tmp);
2680 }
2681 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2682 break;
2683 case 38: // rx connect speed
2684 if (n == 4)
2685 {
2686 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2687 }
2688 else
2689 {
2690 // AS5300s send connect speed as a string
2691 char tmp[30];
2692 memset(tmp, 0, sizeof(tmp));
2693 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2694 session[s].rx_connect_speed = atol(tmp);
2695 }
2696 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2697 break;
2698 case 25: // Physical Channel ID
2699 {
2700 uint32_t tmp = ntohl(*(uint32_t *) b);
2701 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2702 break;
2703 }
2704 case 29: // Proxy Authentication Type
2705 {
2706 uint16_t atype = ntohs(*(uint16_t *)b);
2707 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2708 break;
2709 }
2710 case 30: // Proxy Authentication Name
2711 {
2712 char authname[64];
2713 memset(authname, 0, sizeof(authname));
2714 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2715 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2716 authname);
2717 break;
2718 }
2719 case 31: // Proxy Authentication Challenge
2720 {
2721 LOG(4, s, t, " Proxy Auth Challenge\n");
2722 break;
2723 }
2724 case 32: // Proxy Authentication ID
2725 {
2726 uint16_t authid = ntohs(*(uint16_t *)(b));
2727 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2728 break;
2729 }
2730 case 33: // Proxy Authentication Response
2731 LOG(4, s, t, " Proxy Auth Response\n");
2732 break;
2733 case 27: // last sent lcp
2734 { // find magic number
2735 uint8_t *p = b, *e = p + n;
2736 while (p + 1 < e && p[1] && p + p[1] <= e)
2737 {
2738 if (*p == 5 && p[1] == 6) // Magic-Number
2739 amagic = ntohl(*(uint32_t *) (p + 2));
2740 else if (*p == 7) // Protocol-Field-Compression
2741 aflags |= SESSION_PFC;
2742 else if (*p == 8) // Address-and-Control-Field-Compression
2743 aflags |= SESSION_ACFC;
2744 p += p[1];
2745 }
2746 }
2747 break;
2748 case 28: // last recv lcp confreq
2749 break;
2750 case 26: // Initial Received LCP CONFREQ
2751 break;
2752 case 39: // seq required - we control it as an LNS anyway...
2753 break;
2754 case 36: // Random Vector
2755 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2756 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2757 if (n > sizeof(session[s].random_vector))
2758 n = sizeof(session[s].random_vector);
2759 memcpy(session[s].random_vector, b, n);
2760 session[s].random_vector_length = n;
2761 break;
2762 case 46: // ppp disconnect cause
2763 if (n >= 5)
2764 {
2765 uint16_t code = ntohs(*(uint16_t *) b);
2766 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2767 uint8_t dir = *(b + 4);
2768
2769 LOG(4, s, t, " PPP disconnect cause "
2770 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2771 code, proto, dir, n - 5, b + 5);
2772
2773 disc_cause_set = mtype;
2774
2775 switch (code)
2776 {
2777 case 1: // admin disconnect
2778 disc_cause = TERM_ADMIN_RESET;
2779 disc_reason = "Administrative disconnect";
2780 break;
2781 case 3: // lcp terminate
2782 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2783 disc_cause = TERM_USER_REQUEST;
2784 disc_reason = "Normal disconnection";
2785 break;
2786 case 4: // compulsory encryption unavailable
2787 if (dir != 1) break; // 1=refused by peer, 2=local
2788 disc_cause = TERM_USER_ERROR;
2789 disc_reason = "Compulsory encryption refused";
2790 break;
2791 case 5: // lcp: fsm timeout
2792 disc_cause = TERM_PORT_ERROR;
2793 disc_reason = "LCP: FSM timeout";
2794 break;
2795 case 6: // lcp: no recognisable lcp packets received
2796 disc_cause = TERM_PORT_ERROR;
2797 disc_reason = "LCP: no recognisable LCP packets";
2798 break;
2799 case 7: // lcp: magic-no error (possibly looped back)
2800 disc_cause = TERM_PORT_ERROR;
2801 disc_reason = "LCP: magic-no error (possible loop)";
2802 break;
2803 case 8: // lcp: echo request timeout
2804 disc_cause = TERM_PORT_ERROR;
2805 disc_reason = "LCP: echo request timeout";
2806 break;
2807 case 13: // auth: fsm timeout
2808 disc_cause = TERM_SERVICE_UNAVAILABLE;
2809 disc_reason = "Authentication: FSM timeout";
2810 break;
2811 case 15: // auth: unacceptable auth protocol
2812 disc_cause = TERM_SERVICE_UNAVAILABLE;
2813 disc_reason = "Unacceptable authentication protocol";
2814 break;
2815 case 16: // auth: authentication failed
2816 disc_cause = TERM_SERVICE_UNAVAILABLE;
2817 disc_reason = "Authentication failed";
2818 break;
2819 case 17: // ncp: fsm timeout
2820 disc_cause = TERM_SERVICE_UNAVAILABLE;
2821 disc_reason = "NCP: FSM timeout";
2822 break;
2823 case 18: // ncp: no ncps available
2824 disc_cause = TERM_SERVICE_UNAVAILABLE;
2825 disc_reason = "NCP: no NCPs available";
2826 break;
2827 case 19: // ncp: failure to converge on acceptable address
2828 disc_cause = TERM_SERVICE_UNAVAILABLE;
2829 disc_reason = (dir == 1)
2830 ? "NCP: too many Configure-Naks received from peer"
2831 : "NCP: too many Configure-Naks sent to peer";
2832 break;
2833 case 20: // ncp: user not permitted to use any address
2834 disc_cause = TERM_SERVICE_UNAVAILABLE;
2835 disc_reason = (dir == 1)
2836 ? "NCP: local link address not acceptable to peer"
2837 : "NCP: remote link address not acceptable";
2838 break;
2839 }
2840 }
2841 break;
2842 default:
2843 {
2844 static char e[] = "unknown AVP 0xXXXX";
2845 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2846 fatal = flags;
2847 result = 2; // general error
2848 error = 8; // unknown mandatory AVP
2849 sprintf((msg = e) + 14, "%04x", mtype);
2850 continue; // next
2851 }
2852 }
2853 }
2854 // process message
2855 if (fatal & 0x80)
2856 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2857 else
2858 switch (message)
2859 {
2860 case 1: // SCCRQ - Start Control Connection Request
2861 tunnel[t].state = TUNNELOPENING;
2862 if (main_quit != QUIT_SHUTDOWN)
2863 {
2864 controlt *c = controlnew(2); // sending SCCRP
2865 control16(c, 2, version, 1); // protocol version
2866 control32(c, 3, 3, 1); // framing
2867 controls(c, 7, hostname, 1); // host name
2868 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2869 control16(c, 9, t, 1); // assigned tunnel
2870 controladd(c, 0, t); // send the resply
2871 }
2872 else
2873 {
2874 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2875 }
2876 break;
2877 case 2: // SCCRP
2878 tunnel[t].state = TUNNELOPEN;
2879 tunnel[t].lastrec = time_now;
2880 break;
2881 case 3: // SCCN
2882 tunnel[t].state = TUNNELOPEN;
2883 tunnel[t].lastrec = time_now;
2884 controlnull(t); // ack
2885 break;
2886 case 4: // StopCCN
2887 controlnull(t); // ack
2888 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2889 break;
2890 case 6: // HELLO
2891 controlnull(t); // simply ACK
2892 break;
2893 case 7: // OCRQ
2894 // TBA
2895 break;
2896 case 8: // OCRO
2897 // TBA
2898 break;
2899 case 9: // OCCN
2900 // TBA
2901 break;
2902 case 10: // ICRQ
2903 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2904 {
2905 controlt *c = controlnew(11); // ICRP
2906
2907 s = sessionfree;
2908 sessionfree = session[s].next;
2909 memset(&session[s], 0, sizeof(session[s]));
2910
2911 if (s > config->cluster_highest_sessionid)
2912 config->cluster_highest_sessionid = s;
2913
2914 session[s].opened = time_now;
2915 session[s].tunnel = t;
2916 session[s].far = asession;
2917 session[s].last_packet = session[s].last_data = time_now;
2918 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2919 control16(c, 14, s, 1); // assigned session
2920 controladd(c, asession, t); // send the reply
2921
2922 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2923 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2924
2925 session[s].ppp.phase = Establish;
2926 session[s].ppp.lcp = Starting;
2927
2928 STAT(session_created);
2929 break;
2930 }
2931
2932 {
2933 controlt *c = controlnew(14); // CDN
2934 if (!sessionfree)
2935 {
2936 STAT(session_overflow);
2937 LOG(1, 0, t, "No free sessions\n");
2938 control16(c, 1, 4, 0); // temporary lack of resources
2939 }
2940 else
2941 control16(c, 1, 2, 7); // shutting down, try another
2942
2943 controladd(c, asession, t); // send the message
2944 }
2945 return;
2946 case 11: // ICRP
2947 // TBA
2948 break;
2949 case 12: // ICCN
2950 if (amagic == 0) amagic = time_now;
2951 session[s].magic = amagic; // set magic number
2952 session[s].flags = aflags; // set flags received
2953 session[s].mru = PPPoE_MRU; // default
2954 controlnull(t); // ack
2955
2956 // start LCP
2957 sess_local[s].lcp_authtype = config->radius_authprefer;
2958 sess_local[s].ppp_mru = MRU;
2959
2960 // Set multilink options before sending initial LCP packet
2961 sess_local[s].mp_mrru = 1614;
2962 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2963
2964 sendlcp(s, t);
2965 change_state(s, lcp, RequestSent);
2966 break;
2967
2968 case 14: // CDN
2969 controlnull(t); // ack
2970 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2971 break;
2972 case 0xFFFF:
2973 LOG(1, s, t, "Missing message type\n");
2974 break;
2975 default:
2976 STAT(tunnel_rx_errors);
2977 if (mandatory)
2978 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2979 else
2980 LOG(1, s, t, "Unknown message type %u\n", message);
2981 break;
2982 }
2983 if (chapresponse) free(chapresponse);
2984 cluster_send_tunnel(t);
2985 }
2986 else
2987 {
2988 LOG(4, s, t, " Got a ZLB ack\n");
2989 }
2990 }
2991 else
2992 { // data
2993 uint16_t proto;
2994
2995 LOG_HEX(5, "Receive Tunnel Data", p, l);
2996 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2997 { // HDLC address header, discard
2998 p += 2;
2999 l -= 2;
3000 }
3001 if (l < 2)
3002 {
3003 LOG(1, s, t, "Short ppp length %d\n", l);
3004 STAT(tunnel_rx_errors);
3005 return;
3006 }
3007 if (*p & 1)
3008 {
3009 proto = *p++;
3010 l--;
3011 }
3012 else
3013 {
3014 proto = ntohs(*(uint16_t *) p);
3015 p += 2;
3016 l -= 2;
3017 }
3018
3019 if (s && !session[s].opened) // Is something wrong??
3020 {
3021 if (!config->cluster_iam_master)
3022 {
3023 // Pass it off to the master to deal with..
3024 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3025 return;
3026 }
3027
3028
3029 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3030 STAT(tunnel_rx_errors);
3031 return;
3032 }
3033
3034 if (proto == PPPPAP)
3035 {
3036 session[s].last_packet = time_now;
3037 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3038 processpap(s, t, p, l);
3039 }
3040 else if (proto == PPPCHAP)
3041 {
3042 session[s].last_packet = time_now;
3043 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3044 processchap(s, t, p, l);
3045 }
3046 else if (proto == PPPLCP)
3047 {
3048 session[s].last_packet = time_now;
3049 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3050 processlcp(s, t, p, l);
3051 }
3052 else if (proto == PPPIPCP)
3053 {
3054 session[s].last_packet = time_now;
3055 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3056 processipcp(s, t, p, l);
3057 }
3058 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3059 {
3060 session[s].last_packet = time_now;
3061 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3062 processipv6cp(s, t, p, l);
3063 }
3064 else if (proto == PPPCCP)
3065 {
3066 session[s].last_packet = time_now;
3067 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3068 processccp(s, t, p, l);
3069 }
3070 else if (proto == PPPIP)
3071 {
3072 if (session[s].die)
3073 {
3074 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3075 return; // closing session, PPP not processed
3076 }
3077
3078 session[s].last_packet = session[s].last_data = time_now;
3079 if (session[s].walled_garden && !config->cluster_iam_master)
3080 {
3081 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3082 return;
3083 }
3084
3085 processipin(s, t, p, l);
3086 }
3087 else if (proto == PPPMP)
3088 {
3089 if (session[s].die)
3090 {
3091 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3092 return; // closing session, PPP not processed
3093 }
3094
3095 session[s].last_packet = session[s].last_data = time_now;
3096 if (session[s].walled_garden && !config->cluster_iam_master)
3097 {
3098 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3099 return;
3100 }
3101
3102 processmpin(s, t, p, l);
3103 }
3104 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3105 {
3106 if (session[s].die)
3107 {
3108 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3109 return; // closing session, PPP not processed
3110 }
3111
3112 session[s].last_packet = session[s].last_data = time_now;
3113 if (session[s].walled_garden && !config->cluster_iam_master)
3114 {
3115 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3116 return;
3117 }
3118
3119 processipv6in(s, t, p, l);
3120 }
3121 else if (session[s].ppp.lcp == Opened)
3122 {
3123 session[s].last_packet = time_now;
3124 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3125 protoreject(s, t, p, l, proto);
3126 }
3127 else
3128 {
3129 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3130 proto, ppp_state(session[s].ppp.lcp));
3131 }
3132 }
3133 }
3134
3135 // read and process packet on tun
3136 static void processtun(uint8_t * buf, int len)
3137 {
3138 LOG_HEX(5, "Receive TUN Data", buf, len);
3139 STAT(tun_rx_packets);
3140 INC_STAT(tun_rx_bytes, len);
3141
3142 CSTAT(processtun);
3143
3144 eth_rx_pkt++;
3145 eth_rx += len;
3146 if (len < 22)
3147 {
3148 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3149 STAT(tun_rx_errors);
3150 return;
3151 }
3152
3153 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3154 processipout(buf, len);
3155 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3156 && config->ipv6_prefix.s6_addr[0])
3157 processipv6out(buf, len);
3158
3159 // Else discard.
3160 }
3161
3162 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3163 // that we look at the whole of the tunnel, radius and session tables
3164 // every second
3165 static void regular_cleanups(double period)
3166 {
3167 // Next tunnel, radius and session to check for actions on.
3168 static tunnelidt t = 0;
3169 static int r = 0;
3170 static sessionidt s = 0;
3171
3172 int t_actions = 0;
3173 int r_actions = 0;
3174 int s_actions = 0;
3175
3176 int t_slice;
3177 int r_slice;
3178 int s_slice;
3179
3180 int i;
3181 int a;
3182
3183 // divide up tables into slices based on the last run
3184 t_slice = config->cluster_highest_tunnelid * period;
3185 r_slice = (MAXRADIUS - 1) * period;
3186 s_slice = config->cluster_highest_sessionid * period;
3187
3188 if (t_slice < 1)
3189 t_slice = 1;
3190 else if (t_slice > config->cluster_highest_tunnelid)
3191 t_slice = config->cluster_highest_tunnelid;
3192
3193 if (r_slice < 1)
3194 r_slice = 1;
3195 else if (r_slice > (MAXRADIUS - 1))
3196 r_slice = MAXRADIUS - 1;
3197
3198 if (s_slice < 1)
3199 s_slice = 1;
3200 else if (s_slice > config->cluster_highest_sessionid)
3201 s_slice = config->cluster_highest_sessionid;
3202
3203 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3204
3205 for (i = 0; i < t_slice; i++)
3206 {
3207 t++;
3208 if (t > config->cluster_highest_tunnelid)
3209 t = 1;
3210
3211 // check for expired tunnels
3212 if (tunnel[t].die && tunnel[t].die <= TIME)
3213 {
3214 STAT(tunnel_timeout);
3215 tunnelkill(t, "Expired");
3216 t_actions++;
3217 continue;
3218 }
3219 // check for message resend
3220 if (tunnel[t].retry && tunnel[t].controlc)
3221 {
3222 // resend pending messages as timeout on reply
3223 if (tunnel[t].retry <= TIME)
3224 {
3225 controlt *c = tunnel[t].controls;
3226 uint16_t w = tunnel[t].window;
3227 tunnel[t].try++; // another try
3228 if (tunnel[t].try > 5)
3229 tunnelkill(t, "Timeout on control message"); // game over
3230 else
3231 while (c && w--)
3232 {
3233 tunnelsend(c->buf, c->length, t);
3234 c = c->next;
3235 }
3236
3237 t_actions++;
3238 }
3239 }
3240 // Send hello
3241 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3242 {
3243 controlt *c = controlnew(6); // sending HELLO
3244 controladd(c, 0, t); // send the message
3245 LOG(3, 0, t, "Sending HELLO message\n");
3246 t_actions++;
3247 }
3248
3249 // Check for tunnel changes requested from the CLI
3250 if ((a = cli_tunnel_actions[t].action))
3251 {
3252 cli_tunnel_actions[t].action = 0;
3253 if (a & CLI_TUN_KILL)
3254 {
3255 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3256 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3257 t_actions++;
3258 }
3259 }
3260 }
3261
3262 for (i = 0; i < r_slice; i++)
3263 {
3264 r++;
3265 if (r >= MAXRADIUS)
3266 r = 1;
3267
3268 if (!radius[r].state)
3269 continue;
3270
3271 if (radius[r].retry <= TIME)
3272 {
3273 radiusretry(r);
3274 r_actions++;
3275 }
3276 }
3277
3278 for (i = 0; i < s_slice; i++)
3279 {
3280 s++;
3281 if (s > config->cluster_highest_sessionid)
3282 s = 1;
3283
3284 if (!session[s].opened) // Session isn't in use
3285 continue;
3286
3287 // check for expired sessions
3288 if (session[s].die)
3289 {
3290 if (session[s].die <= TIME)
3291 {
3292 sessionkill(s, "Expired");
3293 s_actions++;
3294 }
3295 continue;
3296 }
3297
3298 // PPP timeouts
3299 if (sess_local[s].lcp.restart <= time_now)
3300 {
3301 int next_state = session[s].ppp.lcp;
3302 switch (session[s].ppp.lcp)
3303 {
3304 case RequestSent:
3305 case AckReceived:
3306 next_state = RequestSent;
3307
3308 case AckSent:
3309 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3310 {
3311 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3312 sendlcp(s, session[s].tunnel);
3313 change_state(s, lcp, next_state);
3314 }
3315 else
3316 {
3317 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3318 STAT(session_timeout);
3319 }
3320
3321 s_actions++;
3322 }
3323
3324 if (session[s].die)
3325 continue;
3326 }
3327
3328 if (sess_local[s].ipcp.restart <= time_now)
3329 {
3330 int next_state = session[s].ppp.ipcp;
3331 switch (session[s].ppp.ipcp)
3332 {
3333 case RequestSent:
3334 case AckReceived:
3335 next_state = RequestSent;
3336
3337 case AckSent:
3338 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3339 {
3340 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3341 sendipcp(s, session[s].tunnel);
3342 change_state(s, ipcp, next_state);
3343 }
3344 else
3345 {
3346 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3347 STAT(session_timeout);
3348 }
3349
3350 s_actions++;
3351 }
3352
3353 if (session[s].die)
3354 continue;
3355 }
3356
3357 if (sess_local[s].ipv6cp.restart <= time_now)
3358 {
3359 int next_state = session[s].ppp.ipv6cp;
3360 switch (session[s].ppp.ipv6cp)
3361 {
3362 case RequestSent:
3363 case AckReceived:
3364 next_state = RequestSent;
3365
3366 case AckSent:
3367 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3368 {
3369 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3370 sendipv6cp(s, session[s].tunnel);
3371 change_state(s, ipv6cp, next_state);
3372 }
3373 else
3374 {
3375 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3376 change_state(s, ipv6cp, Stopped);
3377 }
3378
3379 s_actions++;
3380 }
3381 }
3382
3383 if (sess_local[s].ccp.restart <= time_now)
3384 {
3385 int next_state = session[s].ppp.ccp;
3386 switch (session[s].ppp.ccp)
3387 {
3388 case RequestSent:
3389 case AckReceived:
3390 next_state = RequestSent;
3391
3392 case AckSent:
3393 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3394 {
3395 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3396 sendccp(s, session[s].tunnel);
3397 change_state(s, ccp, next_state);
3398 }
3399 else
3400 {
3401 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3402 change_state(s, ccp, Stopped);
3403 }
3404
3405 s_actions++;
3406 }
3407 }
3408
3409 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3410 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3411 {
3412 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3413 STAT(session_timeout);
3414 s_actions++;
3415 continue;
3416 }
3417
3418 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3419 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3420 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3421 {
3422 uint8_t b[MAXETHER];
3423
3424 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3425 if (!q) continue;
3426
3427 *q = EchoReq;
3428 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3429 *(uint16_t *)(q + 2) = htons(8); // Length
3430 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3431
3432 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3433 (int)(time_now - session[s].last_packet));
3434 tunnelsend(b, 24, session[s].tunnel); // send it
3435 sess_local[s].last_echo = time_now;
3436 s_actions++;
3437 }
3438
3439 // Drop sessions who have reached session_timeout seconds
3440 if (session[s].session_timeout)
3441 {
3442 bundleidt bid = session[s].bundle;
3443 if (bid)
3444 {
3445 if (time_now - bundle[bid].last_check >= 1)
3446 {
3447 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3448 bundle[bid].last_check = time_now;
3449 if (bundle[bid].online_time >= session[s].session_timeout)
3450 {
3451 int ses;
3452 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3453 {
3454 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3455 s_actions++;
3456 continue;
3457 }
3458 }
3459 }
3460 }
3461 else if (time_now - session[s].opened >= session[s].session_timeout)
3462 {
3463 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3464 s_actions++;
3465 continue;
3466 }
3467 }
3468
3469 // Drop sessions who have reached idle_timeout seconds
3470 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3471 {
3472 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3473 STAT(session_timeout);
3474 s_actions++;
3475 continue;
3476 }
3477
3478 // Check for actions requested from the CLI
3479 if ((a = cli_session_actions[s].action))
3480 {
3481 int send = 0;
3482
3483 cli_session_actions[s].action = 0;
3484 if (a & CLI_SESS_KILL)
3485 {
3486 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3487 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3488 a = 0; // dead, no need to check for other actions
3489 s_actions++;
3490 }
3491
3492 if (a & CLI_SESS_NOSNOOP)
3493 {
3494 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3495 session[s].snoop_ip = 0;
3496 session[s].snoop_port = 0;
3497 s_actions++;
3498 send++;
3499 }
3500 else if (a & CLI_SESS_SNOOP)
3501 {
3502 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3503 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3504 cli_session_actions[s].snoop_port);
3505
3506 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3507 session[s].snoop_port = cli_session_actions[s].snoop_port;
3508 s_actions++;
3509 send++;
3510 }
3511
3512 if (a & CLI_SESS_NOTHROTTLE)
3513 {
3514 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3515 throttle_session(s, 0, 0);
3516 s_actions++;
3517 send++;
3518 }
3519 else if (a & CLI_SESS_THROTTLE)
3520 {
3521 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3522 cli_session_actions[s].throttle_in,
3523 cli_session_actions[s].throttle_out);
3524
3525 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3526 s_actions++;
3527 send++;
3528 }
3529
3530 if (a & CLI_SESS_NOFILTER)
3531 {
3532 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3533 filter_session(s, 0, 0);
3534 s_actions++;
3535 send++;
3536 }
3537 else if (a & CLI_SESS_FILTER)
3538 {
3539 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3540 cli_session_actions[s].filter_in,
3541 cli_session_actions[s].filter_out);
3542
3543 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3544 s_actions++;
3545 send++;
3546 }
3547
3548 if (send)
3549 cluster_send_session(s);
3550 }
3551
3552 // RADIUS interim accounting
3553 if (config->radius_accounting && config->radius_interim > 0
3554 && session[s].ip && !session[s].walled_garden
3555 && !sess_local[s].radius // RADIUS already in progress
3556 && time_now - sess_local[s].last_interim >= config->radius_interim
3557 && session[s].flags & SESSION_STARTED)
3558 {
3559 int rad = radiusnew(s);
3560 if (!rad)
3561 {
3562 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3563 STAT(radius_overflow);
3564 continue;
3565 }
3566
3567 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3568 session[s].user, session[s].unique_id);
3569
3570 radiussend(rad, RADIUSINTERIM);
3571 sess_local[s].last_interim = time_now;
3572 s_actions++;
3573 }
3574 }
3575
3576 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3577 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3578 }
3579
3580 //
3581 // Are we in the middle of a tunnel update, or radius
3582 // requests??
3583 //
3584 static int still_busy(void)
3585 {
3586 int i;
3587 static clockt last_talked = 0;
3588 static clockt start_busy_wait = 0;
3589
3590 #ifdef BGP
3591 static time_t stopped_bgp = 0;
3592 if (bgp_configured)
3593 {
3594 if (!stopped_bgp)
3595 {
3596 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3597
3598 for (i = 0; i < BGP_NUM_PEERS; i++)
3599 if (bgp_peers[i].state == Established)
3600 bgp_stop(&bgp_peers[i]);
3601
3602 stopped_bgp = time_now;
3603
3604 if (!config->cluster_iam_master)
3605 {
3606 // we don't want to become master
3607 cluster_send_ping(0);
3608
3609 return 1;
3610 }
3611 }
3612
3613 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3614 return 1;
3615 }
3616 #endif /* BGP */
3617
3618 if (!config->cluster_iam_master)
3619 return 0;
3620
3621 if (main_quit == QUIT_SHUTDOWN)
3622 {
3623 static int dropped = 0;
3624 if (!dropped)
3625 {
3626 int i;
3627
3628 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3629 for (i = 1; i < MAXTUNNEL; i++)
3630 if (tunnel[i].ip || tunnel[i].state)
3631 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3632
3633 dropped = 1;
3634 }
3635 }
3636
3637 if (start_busy_wait == 0)
3638 start_busy_wait = TIME;
3639
3640 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3641 {
3642 if (!tunnel[i].controlc)
3643 continue;
3644
3645 if (last_talked != TIME)
3646 {
3647 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3648 last_talked = TIME;
3649 }
3650 return 1;
3651 }
3652
3653 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3654 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3655 {
3656 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3657 return 0;
3658 }
3659
3660 for (i = 1; i < MAXRADIUS; i++)
3661 {
3662 if (radius[i].state == RADIUSNULL)
3663 continue;
3664 if (radius[i].state == RADIUSWAIT)
3665 continue;
3666
3667 if (last_talked != TIME)
3668 {
3669 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3670 last_talked = TIME;
3671 }
3672 return 1;
3673 }
3674
3675 return 0;
3676 }
3677
3678 #ifdef HAVE_EPOLL
3679 # include <sys/epoll.h>
3680 #else
3681 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3682 # include "fake_epoll.h"
3683 #endif
3684
3685 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3686 #define BASE_FDS 7
3687
3688 // additional polled fds
3689 #ifdef BGP
3690 # define EXTRA_FDS BGP_NUM_PEERS
3691 #else
3692 # define EXTRA_FDS 0
3693 #endif
3694
3695 // main loop - gets packets on tun or udp and processes them
3696 static void mainloop(void)
3697 {
3698 int i;
3699 uint8_t buf[65536];
3700 clockt next_cluster_ping = 0; // send initial ping immediately
3701 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3702 int maxevent = sizeof(events)/sizeof(*events);
3703
3704 if ((epollfd = epoll_create(maxevent)) < 0)
3705 {
3706 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3707 exit(1);
3708 }
3709
3710 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3711 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3712
3713 /* setup our fds to poll for input */
3714 {
3715 static struct event_data d[BASE_FDS];
3716 struct epoll_event e;
3717
3718 e.events = EPOLLIN;
3719 i = 0;
3720
3721 if (clifd >= 0)
3722 {
3723 d[i].type = FD_TYPE_CLI;
3724 e.data.ptr = &d[i++];
3725 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3726 }
3727
3728 d[i].type = FD_TYPE_CLUSTER;
3729 e.data.ptr = &d[i++];
3730 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3731
3732 d[i].type = FD_TYPE_TUN;
3733 e.data.ptr = &d[i++];
3734 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3735
3736 d[i].type = FD_TYPE_UDP;
3737 e.data.ptr = &d[i++];
3738 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3739
3740 d[i].type = FD_TYPE_CONTROL;
3741 e.data.ptr = &d[i++];
3742 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3743
3744 d[i].type = FD_TYPE_DAE;
3745 e.data.ptr = &d[i++];
3746 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3747
3748 d[i].type = FD_TYPE_NETLINK;
3749 e.data.ptr = &d[i++];
3750 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3751 }
3752
3753 #ifdef BGP
3754 signal(SIGPIPE, SIG_IGN);
3755 bgp_setup(config->as_number);
3756 if (config->bind_address)
3757 bgp_add_route(config->bind_address, 0xffffffff);
3758
3759 for (i = 0; i < BGP_NUM_PEERS; i++)
3760 {
3761 if (config->neighbour[i].name[0])
3762 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3763 config->neighbour[i].as, config->neighbour[i].keepalive,
3764 config->neighbour[i].hold, config->neighbour[i].update_source,
3765 0); /* 0 = routing disabled */
3766 }
3767 #endif /* BGP */
3768
3769 while (!main_quit || still_busy())
3770 {
3771 int more = 0;
3772 int n;
3773
3774
3775 if (main_reload)
3776 {
3777 main_reload = 0;
3778 read_config_file();
3779 config->reload_config++;
3780 }
3781
3782 if (config->reload_config)
3783 {
3784 config->reload_config = 0;
3785 update_config();
3786 }
3787
3788 #ifdef BGP
3789 bgp_set_poll();
3790 #endif /* BGP */
3791
3792 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3793 STAT(select_called);
3794
3795 TIME = now(NULL);
3796 if (n < 0)
3797 {
3798 if (errno == EINTR ||
3799 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3800 continue;
3801
3802 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3803 break; // exit
3804 }
3805
3806 if (n)
3807 {
3808 struct sockaddr_in addr;
3809 struct in_addr local;
3810 socklen_t alen;
3811 int c, s;
3812 int udp_ready = 0;
3813 int tun_ready = 0;
3814 int cluster_ready = 0;
3815 int udp_pkts = 0;
3816 int tun_pkts = 0;
3817 int cluster_pkts = 0;
3818 #ifdef BGP
3819 uint32_t bgp_events[BGP_NUM_PEERS];
3820 memset(bgp_events, 0, sizeof(bgp_events));
3821 #endif /* BGP */
3822
3823 for (c = n, i = 0; i < c; i++)
3824 {
3825 struct event_data *d = events[i].data.ptr;
3826
3827 switch (d->type)
3828 {
3829 case FD_TYPE_CLI: // CLI connections
3830 {
3831 int cli;
3832
3833 alen = sizeof(addr);
3834 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3835 {
3836 cli_do(cli);
3837 close(cli);
3838 }
3839 else
3840 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3841
3842 n--;
3843 break;
3844 }
3845
3846 // these are handled below, with multiple interleaved reads
3847 case FD_TYPE_CLUSTER: cluster_ready++; break;
3848 case FD_TYPE_TUN: tun_ready++; break;
3849 case FD_TYPE_UDP: udp_ready++; break;
3850
3851 case FD_TYPE_CONTROL: // nsctl commands
3852 alen = sizeof(addr);
3853 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3854 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3855 n--;
3856 break;
3857
3858 case FD_TYPE_DAE: // DAE requests
3859 alen = sizeof(addr);
3860 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3861 if (s > 0) processdae(buf, s, &addr, alen, &local);
3862 n--;
3863 break;
3864
3865 case FD_TYPE_RADIUS: // RADIUS response
3866 alen = sizeof(addr);
3867 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3868 if (s >= 0 && config->cluster_iam_master)
3869 {
3870 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3871 addr.sin_addr.s_addr == config->radiusserver[1])
3872 processrad(buf, s, d->index);
3873 else
3874 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3875 fmtaddr(addr.sin_addr.s_addr, 0));
3876 }
3877
3878 n--;
3879 break;
3880
3881 #ifdef BGP
3882 case FD_TYPE_BGP:
3883 bgp_events[d->index] = events[i].events;
3884 n--;
3885 break;
3886 #endif /* BGP */
3887
3888 case FD_TYPE_NETLINK:
3889 {
3890 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
3891 s = netlink_recv(buf, sizeof(buf));
3892 if (nh->nlmsg_type == NLMSG_ERROR)
3893 {
3894 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
3895 if (errmsg->error)
3896 {
3897 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
3898 {
3899 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
3900 exit(1);
3901 }
3902 else
3903
3904 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
3905 }
3906 // else it's a ack
3907 }
3908 else
3909 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);
3910 n--;
3911 break;
3912 }
3913
3914 default:
3915 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3916 }
3917 }
3918
3919 #ifdef BGP
3920 bgp_process(bgp_events);
3921 #endif /* BGP */
3922
3923 for (c = 0; n && c < config->multi_read_count; c++)
3924 {
3925 // L2TP
3926 if (udp_ready)
3927 {
3928 alen = sizeof(addr);
3929 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3930 {
3931 processudp(buf, s, &addr);
3932 udp_pkts++;
3933 }
3934 else
3935 {
3936 udp_ready = 0;
3937 n--;
3938 }
3939 }
3940
3941 // incoming IP
3942 if (tun_ready)
3943 {
3944 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3945 {
3946 processtun(buf, s);
3947 tun_pkts++;
3948 }
3949 else
3950 {
3951 tun_ready = 0;
3952 n--;
3953 }
3954 }
3955
3956 // cluster
3957 if (cluster_ready)
3958 {
3959 alen = sizeof(addr);
3960 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3961 {
3962 processcluster(buf, s, addr.sin_addr.s_addr);
3963 cluster_pkts++;
3964 }
3965 else
3966 {
3967 cluster_ready = 0;
3968 n--;
3969 }
3970 }
3971 }
3972
3973 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3974 STAT(multi_read_used);
3975
3976 if (c >= config->multi_read_count)
3977 {
3978 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3979 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3980
3981 STAT(multi_read_exceeded);
3982 more++;
3983 }
3984 }
3985 #ifdef BGP
3986 else
3987 /* no event received, but timers could still have expired */
3988 bgp_process_peers_timers();
3989 #endif /* BGP */
3990
3991 if (time_changed)
3992 {
3993 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3994
3995 // Log current traffic stats
3996 snprintf(config->bandwidth, sizeof(config->bandwidth),
3997 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3998 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3999 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4000 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4001
4002 udp_tx = udp_rx = 0;
4003 udp_rx_pkt = eth_rx_pkt = 0;
4004 eth_tx = eth_rx = 0;
4005 time_changed = 0;
4006
4007 if (config->dump_speed)
4008 printf("%s\n", config->bandwidth);
4009
4010 // Update the internal time counter
4011 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4012
4013 {
4014 // Run timer hooks
4015 struct param_timer p = { time_now };
4016 run_plugins(PLUGIN_TIMER, &p);
4017 }
4018 }
4019
4020 // Runs on every machine (master and slaves).
4021 if (next_cluster_ping <= TIME)
4022 {
4023 // Check to see which of the cluster is still alive..
4024
4025 cluster_send_ping(basetime); // Only does anything if we're a slave
4026 cluster_check_master(); // ditto.
4027
4028 cluster_heartbeat(); // Only does anything if we're a master.
4029 cluster_check_slaves(); // ditto.
4030
4031 master_update_counts(); // If we're a slave, send our byte counters to our master.
4032
4033 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4034 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4035 else
4036 next_cluster_ping = TIME + config->cluster_hb_interval;
4037 }
4038
4039 if (!config->cluster_iam_master)
4040 continue;
4041
4042 // Run token bucket filtering queue..
4043 // Only run it every 1/10th of a second.
4044 {
4045 static clockt last_run = 0;
4046 if (last_run != TIME)
4047 {
4048 last_run = TIME;
4049 tbf_run_timer();
4050 }
4051 }
4052
4053 // Handle timeouts, retries etc.
4054 {
4055 static double last_clean = 0;
4056 double this_clean;
4057 double diff;
4058
4059 TIME = now(&this_clean);
4060 diff = this_clean - last_clean;
4061
4062 // Run during idle time (after we've handled
4063 // all incoming packets) or every 1/10th sec
4064 if (!more || diff > 0.1)
4065 {
4066 regular_cleanups(diff);
4067 last_clean = this_clean;
4068 }
4069 }
4070
4071 if (*config->accounting_dir)
4072 {
4073 static clockt next_acct = 0;
4074 static clockt next_shut_acct = 0;
4075
4076 if (next_acct <= TIME)
4077 {
4078 // Dump accounting data
4079 next_acct = TIME + ACCT_TIME;
4080 next_shut_acct = TIME + ACCT_SHUT_TIME;
4081 dump_acct_info(1);
4082 }
4083 else if (next_shut_acct <= TIME)
4084 {
4085 // Dump accounting data for shutdown sessions
4086 next_shut_acct = TIME + ACCT_SHUT_TIME;
4087 if (shut_acct_n)
4088 dump_acct_info(0);
4089 }
4090 }
4091 }
4092
4093 // Are we the master and shutting down??
4094 if (config->cluster_iam_master)
4095 cluster_heartbeat(); // Flush any queued changes..
4096
4097 // Ok. Notify everyone we're shutting down. If we're
4098 // the master, this will force an election.
4099 cluster_send_ping(0);
4100
4101 //
4102 // Important!!! We MUST not process any packets past this point!
4103 LOG(1, 0, 0, "Shutdown complete\n");
4104 }
4105
4106 static void stripdomain(char *host)
4107 {
4108 char *p;
4109
4110 if ((p = strchr(host, '.')))
4111 {
4112 char *domain = 0;
4113 char _domain[1024];
4114
4115 // strip off domain
4116 FILE *resolv = fopen("/etc/resolv.conf", "r");
4117 if (resolv)
4118 {
4119 char buf[1024];
4120 char *b;
4121
4122 while (fgets(buf, sizeof(buf), resolv))
4123 {
4124 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4125 continue;
4126
4127 if (!isspace(buf[6]))
4128 continue;
4129
4130 b = buf + 7;
4131 while (isspace(*b)) b++;
4132
4133 if (*b)
4134 {
4135 char *d = b;
4136 while (*b && !isspace(*b)) b++;
4137 *b = 0;
4138 if (buf[0] == 'd') // domain is canonical
4139 {
4140 domain = d;
4141 break;
4142 }
4143
4144 // first search line
4145 if (!domain)
4146 {
4147 // hold, may be subsequent domain line
4148 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4149 domain = _domain;
4150 }
4151 }
4152 }
4153
4154 fclose(resolv);
4155 }
4156
4157 if (domain)
4158 {
4159 int hl = strlen(host);
4160 int dl = strlen(domain);
4161 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4162 host[hl -dl - 1] = 0;
4163 }
4164 else
4165 {
4166 *p = 0; // everything after first dot
4167 }
4168 }
4169 }
4170
4171 // Init data structures
4172 static void initdata(int optdebug, char *optconfig)
4173 {
4174 int i;
4175
4176 if (!(config = shared_malloc(sizeof(configt))))
4177 {
4178 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4179 exit(1);
4180 }
4181
4182 memset(config, 0, sizeof(configt));
4183 time(&config->start_time);
4184 strncpy(config->config_file, optconfig, strlen(optconfig));
4185 config->debug = optdebug;
4186 config->num_tbfs = MAXTBFS;
4187 config->rl_rate = 28; // 28kbps
4188 config->cluster_mcast_ttl = 1;
4189 config->cluster_master_min_adv = 1;
4190 config->ppp_restart_time = 3;
4191 config->ppp_max_configure = 10;
4192 config->ppp_max_failure = 5;
4193 config->kill_timedout_sessions = 1;
4194 strcpy(config->random_device, RANDOMDEVICE);
4195
4196 log_stream = stderr;
4197
4198 #ifdef RINGBUFFER
4199 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4200 {
4201 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4202 exit(1);
4203 }
4204 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4205 #endif
4206
4207 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4208 {
4209 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4210 exit(1);
4211 }
4212 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4213 {
4214 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4215 exit(1);
4216 }
4217 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4218 {
4219 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4220 exit(1);
4221 }
4222 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4223 {
4224 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4225 exit(1);
4226 }
4227 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4228 {
4229 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4230 exit(1);
4231 }
4232
4233 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4234 {
4235 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4236 exit(1);
4237 }
4238
4239 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4240 {
4241 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4242 exit(1);
4243 }
4244
4245 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4246 {
4247 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4248 exit(1);
4249 }
4250
4251 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4252 {
4253 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4254 exit(1);
4255 }
4256 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4257
4258 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4259 {
4260 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4261 exit(1);
4262 }
4263 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4264
4265 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4266 {
4267 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4268 exit(1);
4269 }
4270 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4271
4272 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4273 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4274 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4275 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4276 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4277
4278 // Put all the sessions on the free list marked as undefined.
4279 for (i = 1; i < MAXSESSION; i++)
4280 {
4281 session[i].next = i + 1;
4282 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4283 }
4284 session[MAXSESSION - 1].next = 0;
4285 sessionfree = 1;
4286
4287 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4288 for (i = 1; i < MAXTUNNEL; i++)
4289 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4290
4291 for (i = 1; i < MAXBUNDLE; i++) {
4292 bundle[i].state = BUNDLEUNDEF;
4293 }
4294
4295 if (!*hostname)
4296 {
4297 if (!*config->hostname)
4298 {
4299 // Grab my hostname unless it's been specified
4300 gethostname(hostname, sizeof(hostname));
4301 stripdomain(hostname);
4302 }
4303 else
4304 strcpy(hostname, config->hostname);
4305 }
4306
4307 _statistics->start_time = _statistics->last_reset = time(NULL);
4308
4309 #ifdef BGP
4310 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4311 {
4312 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4313 exit(1);
4314 }
4315 #endif /* BGP */
4316 }
4317
4318 static int assign_ip_address(sessionidt s)
4319 {
4320 uint32_t i;
4321 int best = -1;
4322 time_t best_time = time_now;
4323 char *u = session[s].user;
4324 char reuse = 0;
4325
4326
4327 CSTAT(assign_ip_address);
4328
4329 for (i = 1; i < ip_pool_size; i++)
4330 {
4331 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4332 continue;
4333
4334 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4335 {
4336 best = i;
4337 reuse = 1;
4338 break;
4339 }
4340
4341 if (ip_address_pool[i].last < best_time)
4342 {
4343 best = i;
4344 if (!(best_time = ip_address_pool[i].last))
4345 break; // never used, grab this one
4346 }
4347 }
4348
4349 if (best < 0)
4350 {
4351 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4352 return 0;
4353 }
4354
4355 session[s].ip = ip_address_pool[best].address;
4356 session[s].ip_pool_index = best;
4357 ip_address_pool[best].assigned = 1;
4358 ip_address_pool[best].last = time_now;
4359 ip_address_pool[best].session = s;
4360 if (session[s].walled_garden)
4361 /* Don't track addresses of users in walled garden (note: this
4362 means that their address isn't "sticky" even if they get
4363 un-gardened). */
4364 ip_address_pool[best].user[0] = 0;
4365 else
4366 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4367
4368 STAT(ip_allocated);
4369 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4370 reuse ? "Reusing" : "Allocating", best);
4371
4372 return 1;
4373 }
4374
4375 static void free_ip_address(sessionidt s)
4376 {
4377 int i = session[s].ip_pool_index;
4378
4379
4380 CSTAT(free_ip_address);
4381
4382 if (!session[s].ip)
4383 return; // what the?
4384
4385 if (i < 0) // Is this actually part of the ip pool?
4386 i = 0;
4387
4388 STAT(ip_freed);
4389 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4390 session[s].ip = 0;
4391 ip_address_pool[i].assigned = 0;
4392 ip_address_pool[i].session = 0;
4393 ip_address_pool[i].last = time_now;
4394 }
4395
4396 //
4397 // Fsck the address pool against the session table.
4398 // Normally only called when we become a master.
4399 //
4400 // This isn't perfect: We aren't keep tracking of which
4401 // users used to have an IP address.
4402 //
4403 void rebuild_address_pool(void)
4404 {
4405 int i;
4406
4407 //
4408 // Zero the IP pool allocation, and build
4409 // a map from IP address to pool index.
4410 for (i = 1; i < MAXIPPOOL; ++i)
4411 {
4412 ip_address_pool[i].assigned = 0;
4413 ip_address_pool[i].session = 0;
4414 if (!ip_address_pool[i].address)
4415 continue;
4416
4417 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4418 }
4419
4420 for (i = 0; i < MAXSESSION; ++i)
4421 {
4422 int ipid;
4423 if (!(session[i].opened && session[i].ip))
4424 continue;
4425
4426 ipid = - lookup_ipmap(htonl(session[i].ip));
4427
4428 if (session[i].ip_pool_index < 0)
4429 {
4430 // Not allocated out of the pool.
4431 if (ipid < 1) // Not found in the pool either? good.
4432 continue;
4433
4434 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4435 i, fmtaddr(session[i].ip, 0), ipid);
4436
4437 // Fall through and process it as part of the pool.
4438 }
4439
4440
4441 if (ipid > MAXIPPOOL || ipid < 0)
4442 {
4443 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4444 ipid = -1;
4445 session[i].ip_pool_index = ipid;
4446 continue;
4447 }
4448
4449 ip_address_pool[ipid].assigned = 1;
4450 ip_address_pool[ipid].session = i;
4451 ip_address_pool[ipid].last = time_now;
4452 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4453 session[i].ip_pool_index = ipid;
4454 cache_ipmap(session[i].ip, i); // Fix the ip map.
4455 }
4456 }
4457
4458 //
4459 // Fix the address pool to match a changed session.
4460 // (usually when the master sends us an update).
4461 static void fix_address_pool(int sid)
4462 {
4463 int ipid;
4464
4465 ipid = session[sid].ip_pool_index;
4466
4467 if (ipid > ip_pool_size)
4468 return; // Ignore it. rebuild_address_pool will fix it up.
4469
4470 if (ip_address_pool[ipid].address != session[sid].ip)
4471 return; // Just ignore it. rebuild_address_pool will take care of it.
4472
4473 ip_address_pool[ipid].assigned = 1;
4474 ip_address_pool[ipid].session = sid;
4475 ip_address_pool[ipid].last = time_now;
4476 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4477 }
4478
4479 //
4480 // Add a block of addresses to the IP pool to hand out.
4481 //
4482 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4483 {
4484 int i;
4485 if (prefixlen == 0)
4486 prefixlen = 32; // Host route only.
4487
4488 addr &= 0xffffffff << (32 - prefixlen);
4489
4490 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4491 return ;
4492
4493 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4494 {
4495 if ((i & 0xff) == 0 || (i&0xff) == 255)
4496 continue; // Skip 0 and broadcast addresses.
4497
4498 ip_address_pool[ip_pool_size].address = i;
4499 ip_address_pool[ip_pool_size].assigned = 0;
4500 ++ip_pool_size;
4501 if (ip_pool_size >= MAXIPPOOL)
4502 {
4503 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4504 return;
4505 }
4506 }
4507 }
4508
4509 // Initialize the IP address pool
4510 static void initippool()
4511 {
4512 FILE *f;
4513 char *p;
4514 char buf[4096];
4515 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4516
4517 if (!(f = fopen(IPPOOLFILE, "r")))
4518 {
4519 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4520 exit(1);
4521 }
4522
4523 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4524 {
4525 char *pool = buf;
4526 buf[4095] = 0; // Force it to be zero terminated/
4527
4528 if (*buf == '#' || *buf == '\n')
4529 continue; // Skip comments / blank lines
4530 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4531 if ((p = (char *)strchr(buf, ':')))
4532 {
4533 in_addr_t src;
4534 *p = '\0';
4535 src = inet_addr(buf);
4536 if (src == INADDR_NONE)
4537 {
4538 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4539 exit(1);
4540 }
4541 // This entry is for a specific IP only
4542 if (src != config->bind_address)
4543 continue;
4544 *p = ':';
4545 pool = p+1;
4546 }
4547 if ((p = (char *)strchr(pool, '/')))
4548 {
4549 // It's a range
4550 int numbits = 0;
4551 in_addr_t start = 0;
4552
4553 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4554 *p++ = 0;
4555 if (!*p || !(numbits = atoi(p)))
4556 {
4557 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4558 continue;
4559 }
4560 start = ntohl(inet_addr(pool));
4561
4562 // Add a static route for this pool
4563 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4564 fmtaddr(htonl(start), 0), numbits);
4565
4566 routeset(0, start, numbits, 0, 1);
4567
4568 add_to_ip_pool(start, numbits);
4569 }
4570 else
4571 {
4572 // It's a single ip address
4573 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4574 }
4575 }
4576 fclose(f);
4577 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4578 }
4579
4580 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4581 {
4582 struct sockaddr_in snoop_addr = {0};
4583 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4584 return;
4585
4586 snoop_addr.sin_family = AF_INET;
4587 snoop_addr.sin_addr.s_addr = destination;
4588 snoop_addr.sin_port = ntohs(port);
4589
4590 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4591 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4592 htons(snoop_addr.sin_port));
4593
4594 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4595 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4596
4597 STAT(packets_snooped);
4598 }
4599
4600 static int dump_session(FILE **f, sessiont *s)
4601 {
4602 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4603 return 1;
4604
4605 if (!*f)
4606 {
4607 char filename[1024];
4608 char timestr[64];
4609 time_t now = time(NULL);
4610
4611 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4612 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4613
4614 if (!(*f = fopen(filename, "w")))
4615 {
4616 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4617 return 0;
4618 }
4619
4620 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4621 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4622 "# host: %s\n"
4623 "# endpoint: %s\n"
4624 "# time: %ld\n"
4625 "# uptime: %ld\n"
4626 "# format: username ip qos uptxoctets downrxoctets\n",
4627 hostname,
4628 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4629 now,
4630 now - basetime);
4631 }
4632
4633 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4634 fprintf(*f, "%s %s %d %u %u\n",
4635 s->user, // username
4636 fmtaddr(htonl(s->ip), 0), // ip
4637 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4638 (uint32_t) s->cin_delta, // uptxoctets
4639 (uint32_t) s->cout_delta); // downrxoctets
4640
4641 s->cin_delta = s->cout_delta = 0;
4642
4643 return 1;
4644 }
4645
4646 static void dump_acct_info(int all)
4647 {
4648 int i;
4649 FILE *f = NULL;
4650
4651
4652 CSTAT(dump_acct_info);
4653
4654 if (shut_acct_n)
4655 {
4656 for (i = 0; i < shut_acct_n; i++)
4657 dump_session(&f, &shut_acct[i]);
4658
4659 shut_acct_n = 0;
4660 }
4661
4662 if (all)
4663 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4664 dump_session(&f, &session[i]);
4665
4666 if (f)
4667 fclose(f);
4668 }
4669
4670 // Main program
4671 int main(int argc, char *argv[])
4672 {
4673 int i;
4674 int optdebug = 0;
4675 char *optconfig = CONFIGFILE;
4676
4677 time(&basetime); // start clock
4678
4679 // scan args
4680 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4681 {
4682 switch (i)
4683 {
4684 case 'd':
4685 if (fork()) exit(0);
4686 setsid();
4687 freopen("/dev/null", "r", stdin);
4688 freopen("/dev/null", "w", stdout);
4689 freopen("/dev/null", "w", stderr);
4690 break;
4691 case 'v':
4692 optdebug++;
4693 break;
4694 case 'c':
4695 optconfig = optarg;
4696 break;
4697 case 'h':
4698 snprintf(hostname, sizeof(hostname), "%s", optarg);
4699 break;
4700 default:
4701 printf("Args are:\n"
4702 "\t-d\t\tDetach from terminal\n"
4703 "\t-c <file>\tConfig file\n"
4704 "\t-h <hostname>\tForce hostname\n"
4705 "\t-v\t\tDebug\n");
4706
4707 return (0);
4708 break;
4709 }
4710 }
4711
4712 // Start the timer routine off
4713 time(&time_now);
4714 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4715
4716 initplugins();
4717 initdata(optdebug, optconfig);
4718
4719 init_cli(hostname);
4720 read_config_file();
4721 update_config();
4722 init_tbf(config->num_tbfs);
4723
4724 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4725 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4726 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4727 {
4728 struct rlimit rlim;
4729 rlim.rlim_cur = RLIM_INFINITY;
4730 rlim.rlim_max = RLIM_INFINITY;
4731 // Remove the maximum core size
4732 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4733 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4734
4735 // Make core dumps go to /tmp
4736 chdir("/tmp");
4737 }
4738
4739 if (config->scheduler_fifo)
4740 {
4741 int ret;
4742 struct sched_param params = {0};
4743 params.sched_priority = 1;
4744
4745 if (get_nprocs() < 2)
4746 {
4747 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4748 config->scheduler_fifo = 0;
4749 }
4750 else
4751 {
4752 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4753 {
4754 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4755 }
4756 else
4757 {
4758 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4759 config->scheduler_fifo = 0;
4760 }
4761 }
4762 }
4763
4764 initnetlink();
4765
4766 /* Set up the cluster communications port. */
4767 if (cluster_init() < 0)
4768 exit(1);
4769
4770 inittun();
4771 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4772
4773 initudp();
4774 initrad();
4775 initippool();
4776
4777 // seed prng
4778 {
4779 unsigned seed = time_now ^ getpid();
4780 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4781 srand(seed);
4782 }
4783
4784 signal(SIGHUP, sighup_handler);
4785 signal(SIGCHLD, sigchild_handler);
4786 signal(SIGTERM, shutdown_handler);
4787 signal(SIGINT, shutdown_handler);
4788 signal(SIGQUIT, shutdown_handler);
4789
4790 // Prevent us from getting paged out
4791 if (config->lock_pages)
4792 {
4793 if (!mlockall(MCL_CURRENT))
4794 LOG(1, 0, 0, "Locking pages into memory\n");
4795 else
4796 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4797 }
4798
4799 mainloop();
4800
4801 /* remove plugins (so cleanup code gets run) */
4802 plugins_done();
4803
4804 // Remove the PID file if we wrote it
4805 if (config->wrote_pid && *config->pid_file == '/')
4806 unlink(config->pid_file);
4807
4808 /* kill CLI children */
4809 signal(SIGTERM, SIG_IGN);
4810 kill(0, SIGTERM);
4811 return 0;
4812 }
4813
4814 static void sighup_handler(int sig)
4815 {
4816 main_reload++;
4817 }
4818
4819 static void shutdown_handler(int sig)
4820 {
4821 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4822 }
4823
4824 static void sigchild_handler(int sig)
4825 {
4826 while (waitpid(-1, NULL, WNOHANG) > 0)
4827 ;
4828 }
4829
4830 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4831 {
4832 MD5_CTX ctx;
4833 *challenge_response = NULL;
4834
4835 if (!*config->l2tp_secret)
4836 {
4837 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4838 return;
4839 }
4840
4841 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4842
4843 *challenge_response = calloc(17, 1);
4844
4845 MD5_Init(&ctx);
4846 MD5_Update(&ctx, &id, 1);
4847 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4848 MD5_Update(&ctx, challenge, challenge_length);
4849 MD5_Final(*challenge_response, &ctx);
4850
4851 return;
4852 }
4853
4854 static int facility_value(char *name)
4855 {
4856 int i;
4857 for (i = 0; facilitynames[i].c_name; i++)
4858 {
4859 if (strcmp(facilitynames[i].c_name, name) == 0)
4860 return facilitynames[i].c_val;
4861 }
4862 return 0;
4863 }
4864
4865 static void update_config()
4866 {
4867 int i;
4868 char *p;
4869 static int timeout = 0;
4870 static int interval = 0;
4871
4872 // Update logging
4873 closelog();
4874 syslog_log = 0;
4875 if (log_stream)
4876 {
4877 if (log_stream != stderr)
4878 fclose(log_stream);
4879
4880 log_stream = NULL;
4881 }
4882
4883 if (*config->log_filename)
4884 {
4885 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4886 {
4887 char *p = config->log_filename + 7;
4888 if (*p)
4889 {
4890 openlog("l2tpns", LOG_PID, facility_value(p));
4891 syslog_log = 1;
4892 }
4893 }
4894 else if (strchr(config->log_filename, '/') == config->log_filename)
4895 {
4896 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4897 {
4898 fseek(log_stream, 0, SEEK_END);
4899 setbuf(log_stream, NULL);
4900 }
4901 else
4902 {
4903 log_stream = stderr;
4904 setbuf(log_stream, NULL);
4905 }
4906 }
4907 }
4908 else
4909 {
4910 log_stream = stderr;
4911 setbuf(log_stream, NULL);
4912 }
4913
4914 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4915 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4916
4917 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4918 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4919 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4920
4921 // reset MRU/MSS globals
4922 MRU = config->l2tp_mtu - L2TP_HDRS;
4923 if (MRU > PPPoE_MRU)
4924 MRU = PPPoE_MRU;
4925
4926 MSS = MRU - TCP_HDRS;
4927
4928 // Update radius
4929 config->numradiusservers = 0;
4930 for (i = 0; i < MAXRADSERVER; i++)
4931 if (config->radiusserver[i])
4932 {
4933 config->numradiusservers++;
4934 // Set radius port: if not set, take the port from the
4935 // first radius server. For the first radius server,
4936 // take the #defined default value from l2tpns.h
4937
4938 // test twice, In case someone works with
4939 // a secondary radius server without defining
4940 // a primary one, this will work even then.
4941 if (i > 0 && !config->radiusport[i])
4942 config->radiusport[i] = config->radiusport[i-1];
4943 if (!config->radiusport[i])
4944 config->radiusport[i] = RADPORT;
4945 }
4946
4947 if (!config->numradiusservers)
4948 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4949
4950 // parse radius_authtypes_s
4951 config->radius_authtypes = config->radius_authprefer = 0;
4952 p = config->radius_authtypes_s;
4953 while (p && *p)
4954 {
4955 char *s = strpbrk(p, " \t,");
4956 int type = 0;
4957
4958 if (s)
4959 {
4960 *s++ = 0;
4961 while (*s == ' ' || *s == '\t')
4962 s++;
4963
4964 if (!*s)
4965 s = 0;
4966 }
4967
4968 if (!strncasecmp("chap", p, strlen(p)))
4969 type = AUTHCHAP;
4970 else if (!strncasecmp("pap", p, strlen(p)))
4971 type = AUTHPAP;
4972 else
4973 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4974
4975 config->radius_authtypes |= type;
4976 if (!config->radius_authprefer)
4977 config->radius_authprefer = type;
4978
4979 p = s;
4980 }
4981
4982 if (!config->radius_authtypes)
4983 {
4984 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4985 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4986 }
4987
4988 // normalise radius_authtypes_s
4989 if (config->radius_authprefer == AUTHPAP)
4990 {
4991 strcpy(config->radius_authtypes_s, "pap");
4992 if (config->radius_authtypes & AUTHCHAP)
4993 strcat(config->radius_authtypes_s, ", chap");
4994 }
4995 else
4996 {
4997 strcpy(config->radius_authtypes_s, "chap");
4998 if (config->radius_authtypes & AUTHPAP)
4999 strcat(config->radius_authtypes_s, ", pap");
5000 }
5001
5002 if (!config->radius_dae_port)
5003 config->radius_dae_port = DAEPORT;
5004
5005 // re-initialise the random number source
5006 initrandom(config->random_device);
5007
5008 // Update plugins
5009 for (i = 0; i < MAXPLUGINS; i++)
5010 {
5011 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5012 continue;
5013
5014 if (*config->plugins[i])
5015 {
5016 // Plugin added
5017 add_plugin(config->plugins[i]);
5018 }
5019 else if (*config->old_plugins[i])
5020 {
5021 // Plugin removed
5022 remove_plugin(config->old_plugins[i]);
5023 }
5024 }
5025
5026 // Guest change
5027 guest_accounts_num = 0;
5028 char *p2 = config->guest_user;
5029 while (p2 && *p2)
5030 {
5031 char *s = strpbrk(p2, " \t,");
5032 if (s)
5033 {
5034 *s++ = 0;
5035 while (*s == ' ' || *s == '\t')
5036 s++;
5037
5038 if (!*s)
5039 s = 0;
5040 }
5041
5042 strcpy(guest_users[guest_accounts_num], p2);
5043 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5044 guest_accounts_num++;
5045 p2 = s;
5046 }
5047 // Rebuild the guest_user array
5048 strcpy(config->guest_user, "");
5049 int ui = 0;
5050 for (ui=0; ui<guest_accounts_num; ui++)
5051 {
5052 strcat(config->guest_user, guest_users[ui]);
5053 if (ui<guest_accounts_num-1)
5054 {
5055 strcat(config->guest_user, ",");
5056 }
5057 }
5058
5059
5060 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5061 if (!config->multi_read_count) config->multi_read_count = 10;
5062 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5063 if (!*config->cluster_interface)
5064 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5065
5066 if (!config->cluster_hb_interval)
5067 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5068
5069 if (!config->cluster_hb_timeout)
5070 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5071
5072 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5073 {
5074 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5075 // late, ensure we're sufficiently larger than that
5076 int t = 4 * config->cluster_hb_interval + 11;
5077
5078 if (config->cluster_hb_timeout < t)
5079 {
5080 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5081 config->cluster_hb_timeout = t;
5082 }
5083
5084 // Push timing changes to the slaves immediately if we're the master
5085 if (config->cluster_iam_master)
5086 cluster_heartbeat();
5087
5088 interval = config->cluster_hb_interval;
5089 timeout = config->cluster_hb_timeout;
5090 }
5091
5092 // Write PID file
5093 if (*config->pid_file == '/' && !config->wrote_pid)
5094 {
5095 FILE *f;
5096 if ((f = fopen(config->pid_file, "w")))
5097 {
5098 fprintf(f, "%d\n", getpid());
5099 fclose(f);
5100 config->wrote_pid = 1;
5101 }
5102 else
5103 {
5104 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5105 }
5106 }
5107 }
5108
5109 static void read_config_file()
5110 {
5111 FILE *f;
5112
5113 if (!config->config_file) return;
5114 if (!(f = fopen(config->config_file, "r")))
5115 {
5116 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5117 return;
5118 }
5119
5120 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5121 cli_do_file(f);
5122 LOG(3, 0, 0, "Done reading config file\n");
5123 fclose(f);
5124 }
5125
5126 int sessionsetup(sessionidt s, tunnelidt t)
5127 {
5128 // A session now exists, set it up
5129 in_addr_t ip;
5130 char *user;
5131 sessionidt i;
5132 int r;
5133
5134 CSTAT(sessionsetup);
5135
5136 LOG(3, s, t, "Doing session setup for session\n");
5137
5138 // Join a bundle if the MRRU option is accepted
5139 if(session[s].mrru > 0 && session[s].bundle == 0)
5140 {
5141 LOG(3, s, t, "This session can be part of multilink bundle\n");
5142 if (join_bundle(s) > 0)
5143 cluster_send_bundle(session[s].bundle);
5144 else
5145 {
5146 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5147 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5148 return 0;
5149 }
5150 }
5151
5152 if (!session[s].ip)
5153 {
5154 assign_ip_address(s);
5155 if (!session[s].ip)
5156 {
5157 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5158 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5159 return 0;
5160 }
5161 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5162 fmtaddr(htonl(session[s].ip), 0));
5163 }
5164
5165
5166 // Make sure this is right
5167 session[s].tunnel = t;
5168
5169 // zap old sessions with same IP and/or username
5170 // Don't kill gardened sessions - doing so leads to a DoS
5171 // from someone who doesn't need to know the password
5172 {
5173 ip = session[s].ip;
5174 user = session[s].user;
5175 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5176 {
5177 if (i == s) continue;
5178 if (!session[s].opened) continue;
5179 // Allow duplicate sessions for multilink ones of the same bundle.
5180 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
5181 continue;
5182 if (ip == session[i].ip)
5183 {
5184 sessionkill(i, "Duplicate IP address");
5185 continue;
5186 }
5187
5188 if (config->allow_duplicate_users) continue;
5189 if (session[s].walled_garden || session[i].walled_garden) continue;
5190 // Guest change
5191 int found = 0;
5192 int gu;
5193 for (gu = 0; gu < guest_accounts_num; gu++)
5194 {
5195 if (!strcasecmp(user, guest_users[gu]))
5196 {
5197 found = 1;
5198 break;
5199 }
5200 }
5201 if (found) continue;
5202
5203 // Drop the new session in case of duplicate sessionss, not the old one.
5204 if (!strcasecmp(user, session[i].user))
5205 sessionkill(i, "Duplicate session for users");
5206 }
5207 }
5208
5209 // no need to set a route for the same IP address of the bundle
5210 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5211 {
5212 int routed = 0;
5213
5214 // Add the route for this session.
5215 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5216 {
5217 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5218 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5219 routed++;
5220
5221 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5222 }
5223
5224 // Static IPs need to be routed if not already
5225 // convered by a Framed-Route. Anything else is part
5226 // of the IP address pool and is already routed, it
5227 // just needs to be added to the IP cache.
5228 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5229 if (session[s].ip_pool_index == -1) // static ip
5230 {
5231 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5232 }
5233 else
5234 cache_ipmap(session[s].ip, s);
5235 }
5236
5237 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5238 lcp_open(s, t); // transition to Network phase and send initial IPCP
5239
5240 // Run the plugin's against this new session.
5241 {
5242 struct param_new_session data = { &tunnel[t], &session[s] };
5243 run_plugins(PLUGIN_NEW_SESSION, &data);
5244 }
5245
5246 // Allocate TBFs if throttled
5247 if (session[s].throttle_in || session[s].throttle_out)
5248 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5249
5250 session[s].last_packet = session[s].last_data = time_now;
5251
5252 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5253 fmtaddr(htonl(session[s].ip), 0),
5254 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5255
5256 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5257
5258 return 1; // RADIUS OK and IP allocated, done...
5259 }
5260
5261 //
5262 // This session just got dropped on us by the master or something.
5263 // Make sure our tables up up to date...
5264 //
5265 int load_session(sessionidt s, sessiont *new)
5266 {
5267 int i;
5268 int newip = 0;
5269
5270 // Sanity checks.
5271 if (new->ip_pool_index >= MAXIPPOOL ||
5272 new->tunnel >= MAXTUNNEL)
5273 {
5274 LOG(0, s, 0, "Strange session update received!\n");
5275 // FIXME! What to do here?
5276 return 0;
5277 }
5278
5279 //
5280 // Ok. All sanity checks passed. Now we're committed to
5281 // loading the new session.
5282 //
5283
5284 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5285
5286 // See if routes/ip cache need updating
5287 if (new->ip != session[s].ip)
5288 newip++;
5289
5290 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5291 if (new->route[i].ip != session[s].route[i].ip ||
5292 new->route[i].prefixlen != session[s].route[i].prefixlen)
5293 newip++;
5294
5295 // needs update
5296 if (newip)
5297 {
5298 int routed = 0;
5299
5300 // remove old routes...
5301 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5302 {
5303 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5304 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5305 routed++;
5306
5307 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5308 }
5309
5310 // ...ip
5311 if (session[s].ip)
5312 {
5313 if (session[s].ip_pool_index == -1) // static IP
5314 {
5315 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5316 }
5317 else // It's part of the IP pool, remove it manually.
5318 uncache_ipmap(session[s].ip);
5319 }
5320
5321 routed = 0;
5322
5323 // add new routes...
5324 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5325 {
5326 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5327 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5328 routed++;
5329
5330 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5331 }
5332
5333 // ...ip
5334 if (new->ip)
5335 {
5336 // If there's a new one, add it.
5337 if (new->ip_pool_index == -1)
5338 {
5339 if (!routed) routeset(s, new->ip, 0, 0, 1);
5340 }
5341 else
5342 cache_ipmap(new->ip, s);
5343 }
5344 }
5345
5346 // check v6 routing
5347 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5348 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5349
5350 // check filters
5351 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5352 {
5353 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5354 new->filter_in = 0;
5355 }
5356
5357 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5358 {
5359 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5360 new->filter_out = 0;
5361 }
5362
5363 if (new->filter_in != session[s].filter_in)
5364 {
5365 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5366 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5367 }
5368
5369 if (new->filter_out != session[s].filter_out)
5370 {
5371 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5372 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5373 }
5374
5375 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5376 // for walking the sessions to forward byte counts to the master.
5377 config->cluster_highest_sessionid = s;
5378
5379 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5380
5381 // Do fixups into address pool.
5382 if (new->ip_pool_index != -1)
5383 fix_address_pool(s);
5384
5385 return 1;
5386 }
5387
5388 static void initplugins()
5389 {
5390 int i;
5391
5392 loaded_plugins = ll_init();
5393 // Initialize the plugins to nothing
5394 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5395 plugins[i] = ll_init();
5396 }
5397
5398 static void *open_plugin(char *plugin_name, int load)
5399 {
5400 char path[256] = "";
5401
5402 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5403 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5404 return dlopen(path, RTLD_NOW);
5405 }
5406
5407 // plugin callback to get a config value
5408 static void *getconfig(char *key, enum config_typet type)
5409 {
5410 int i;
5411
5412 for (i = 0; config_values[i].key; i++)
5413 {
5414 if (!strcmp(config_values[i].key, key))
5415 {
5416 if (config_values[i].type == type)
5417 return ((void *) config) + config_values[i].offset;
5418
5419 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5420 key, type, config_values[i].type);
5421
5422 return 0;
5423 }
5424 }
5425
5426 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5427 return 0;
5428 }
5429
5430 static int add_plugin(char *plugin_name)
5431 {
5432 static struct pluginfuncs funcs = {
5433 _log,
5434 _log_hex,
5435 fmtaddr,
5436 sessionbyuser,
5437 sessiontbysessionidt,
5438 sessionidtbysessiont,
5439 radiusnew,
5440 radiussend,
5441 getconfig,
5442 sessionshutdown,
5443 sessionkill,
5444 throttle_session,
5445 cluster_send_session,
5446 };
5447
5448 void *p = open_plugin(plugin_name, 1);
5449 int (*initfunc)(struct pluginfuncs *);
5450 int i;
5451
5452 if (!p)
5453 {
5454 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5455 return -1;
5456 }
5457
5458 if (ll_contains(loaded_plugins, p))
5459 {
5460 dlclose(p);
5461 return 0; // already loaded
5462 }
5463
5464 {
5465 int *v = dlsym(p, "plugin_api_version");
5466 if (!v || *v != PLUGIN_API_VERSION)
5467 {
5468 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5469 dlclose(p);
5470 return -1;
5471 }
5472 }
5473
5474 if ((initfunc = dlsym(p, "plugin_init")))
5475 {
5476 if (!initfunc(&funcs))
5477 {
5478 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5479 dlclose(p);
5480 return -1;
5481 }
5482 }
5483
5484 ll_push(loaded_plugins, p);
5485
5486 for (i = 0; i < max_plugin_functions; i++)
5487 {
5488 void *x;
5489 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5490 {
5491 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5492 ll_push(plugins[i], x);
5493 }
5494 }
5495
5496 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5497 return 1;
5498 }
5499
5500 static void run_plugin_done(void *plugin)
5501 {
5502 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5503
5504 if (donefunc)
5505 donefunc();
5506 }
5507
5508 static int remove_plugin(char *plugin_name)
5509 {
5510 void *p = open_plugin(plugin_name, 0);
5511 int loaded = 0;
5512
5513 if (!p)
5514 return -1;
5515
5516 if (ll_contains(loaded_plugins, p))
5517 {
5518 int i;
5519 for (i = 0; i < max_plugin_functions; i++)
5520 {
5521 void *x;
5522 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5523 ll_delete(plugins[i], x);
5524 }
5525
5526 ll_delete(loaded_plugins, p);
5527 run_plugin_done(p);
5528 loaded = 1;
5529 }
5530
5531 dlclose(p);
5532 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5533 return loaded;
5534 }
5535
5536 int run_plugins(int plugin_type, void *data)
5537 {
5538 int (*func)(void *data);
5539
5540 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5541 return PLUGIN_RET_ERROR;
5542
5543 ll_reset(plugins[plugin_type]);
5544 while ((func = ll_next(plugins[plugin_type])))
5545 {
5546 int r = func(data);
5547
5548 if (r != PLUGIN_RET_OK)
5549 return r; // stop here
5550 }
5551
5552 return PLUGIN_RET_OK;
5553 }
5554
5555 static void plugins_done()
5556 {
5557 void *p;
5558
5559 ll_reset(loaded_plugins);
5560 while ((p = ll_next(loaded_plugins)))
5561 run_plugin_done(p);
5562 }
5563
5564 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5565 {
5566 struct nsctl request;
5567 struct nsctl response;
5568 int type = unpack_control(&request, buf, len);
5569 int r;
5570 void *p;
5571
5572 if (log_stream && config->debug >= 4)
5573 {
5574 if (type < 0)
5575 {
5576 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5577 fmtaddr(addr->sin_addr.s_addr, 0), type);
5578 }
5579 else
5580 {
5581 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5582 dump_control(&request, log_stream);
5583 }
5584 }
5585
5586 switch (type)
5587 {
5588 case NSCTL_REQ_LOAD:
5589 if (request.argc != 1)
5590 {
5591 response.type = NSCTL_RES_ERR;
5592 response.argc = 1;
5593 response.argv[0] = "name of plugin required";
5594 }
5595 else if ((r = add_plugin(request.argv[0])) < 1)
5596 {
5597 response.type = NSCTL_RES_ERR;
5598 response.argc = 1;
5599 response.argv[0] = !r
5600 ? "plugin already loaded"
5601 : "error loading plugin";
5602 }
5603 else
5604 {
5605 response.type = NSCTL_RES_OK;
5606 response.argc = 0;
5607 }
5608
5609 break;
5610
5611 case NSCTL_REQ_UNLOAD:
5612 if (request.argc != 1)
5613 {
5614 response.type = NSCTL_RES_ERR;
5615 response.argc = 1;
5616 response.argv[0] = "name of plugin required";
5617 }
5618 else if ((r = remove_plugin(request.argv[0])) < 1)
5619 {
5620 response.type = NSCTL_RES_ERR;
5621 response.argc = 1;
5622 response.argv[0] = !r
5623 ? "plugin not loaded"
5624 : "plugin not found";
5625 }
5626 else
5627 {
5628 response.type = NSCTL_RES_OK;
5629 response.argc = 0;
5630 }
5631
5632 break;
5633
5634 case NSCTL_REQ_HELP:
5635 response.type = NSCTL_RES_OK;
5636 response.argc = 0;
5637
5638 ll_reset(loaded_plugins);
5639 while ((p = ll_next(loaded_plugins)))
5640 {
5641 char **help = dlsym(p, "plugin_control_help");
5642 while (response.argc < 0xff && help && *help)
5643 response.argv[response.argc++] = *help++;
5644 }
5645
5646 break;
5647
5648 case NSCTL_REQ_CONTROL:
5649 {
5650 struct param_control param = {
5651 config->cluster_iam_master,
5652 request.argc,
5653 request.argv,
5654 0,
5655 NULL,
5656 };
5657
5658 int r = run_plugins(PLUGIN_CONTROL, &param);
5659
5660 if (r == PLUGIN_RET_ERROR)
5661 {
5662 response.type = NSCTL_RES_ERR;
5663 response.argc = 1;
5664 response.argv[0] = param.additional
5665 ? param.additional
5666 : "error returned by plugin";
5667 }
5668 else if (r == PLUGIN_RET_NOTMASTER)
5669 {
5670 static char msg[] = "must be run on master: 000.000.000.000";
5671
5672 response.type = NSCTL_RES_ERR;
5673 response.argc = 1;
5674 if (config->cluster_master_address)
5675 {
5676 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5677 response.argv[0] = msg;
5678 }
5679 else
5680 {
5681 response.argv[0] = "must be run on master: none elected";
5682 }
5683 }
5684 else if (!(param.response & NSCTL_RESPONSE))
5685 {
5686 response.type = NSCTL_RES_ERR;
5687 response.argc = 1;
5688 response.argv[0] = param.response
5689 ? "unrecognised response value from plugin"
5690 : "unhandled action";
5691 }
5692 else
5693 {
5694 response.type = param.response;
5695 response.argc = 0;
5696 if (param.additional)
5697 {
5698 response.argc = 1;
5699 response.argv[0] = param.additional;
5700 }
5701 }
5702 }
5703
5704 break;
5705
5706 default:
5707 response.type = NSCTL_RES_ERR;
5708 response.argc = 1;
5709 response.argv[0] = "error unpacking control packet";
5710 }
5711
5712 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5713 if (!buf)
5714 {
5715 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5716 return;
5717 }
5718
5719 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5720 if (r > 0)
5721 {
5722 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5723 if (log_stream && config->debug >= 4)
5724 {
5725 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5726 dump_control(&response, log_stream);
5727 }
5728 }
5729 else
5730 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5731 fmtaddr(addr->sin_addr.s_addr, 0), r);
5732
5733 free(buf);
5734 }
5735
5736 static tunnelidt new_tunnel()
5737 {
5738 tunnelidt i;
5739 for (i = 1; i < MAXTUNNEL; i++)
5740 {
5741 if (tunnel[i].state == TUNNELFREE)
5742 {
5743 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5744 if (i > config->cluster_highest_tunnelid)
5745 config->cluster_highest_tunnelid = i;
5746 return i;
5747 }
5748 }
5749 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5750 return 0;
5751 }
5752
5753 //
5754 // We're becoming the master. Do any required setup..
5755 //
5756 // This is principally telling all the plugins that we're
5757 // now a master, and telling them about all the sessions
5758 // that are active too..
5759 //
5760 void become_master(void)
5761 {
5762 int s, i;
5763 static struct event_data d[RADIUS_FDS];
5764 struct epoll_event e;
5765
5766 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5767
5768 // running a bunch of iptables commands is slow and can cause
5769 // the master to drop tunnels on takeover--kludge around the
5770 // problem by forking for the moment (note: race)
5771 if (!fork_and_close())
5772 {
5773 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5774 {
5775 if (!session[s].opened) // Not an in-use session.
5776 continue;
5777
5778 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5779 }
5780 exit(0);
5781 }
5782
5783 // add radius fds
5784 e.events = EPOLLIN;
5785 for (i = 0; i < RADIUS_FDS; i++)
5786 {
5787 d[i].type = FD_TYPE_RADIUS;
5788 d[i].index = i;
5789 e.data.ptr = &d[i];
5790
5791 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5792 }
5793 }
5794
5795 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5796 {
5797 int s, i;
5798 int count = 0;
5799 int buckets[64];
5800
5801 if (CLI_HELP_REQUESTED)
5802 return CLI_HELP_NO_ARGS;
5803
5804 time(&time_now);
5805 for (i = 0; i < 64;++i) buckets[i] = 0;
5806
5807 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5808 {
5809 int idle;
5810 if (!session[s].opened)
5811 continue;
5812
5813 idle = time_now - session[s].last_data;
5814 idle /= 5 ; // In multiples of 5 seconds.
5815 if (idle < 0)
5816 idle = 0;
5817 if (idle > 63)
5818 idle = 63;
5819
5820 ++count;
5821 ++buckets[idle];
5822 }
5823
5824 for (i = 0; i < 63; ++i)
5825 {
5826 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5827 }
5828 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5829 cli_print(cli, "%d total sessions open.", count);
5830 return CLI_OK;
5831 }
5832
5833 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5834 {
5835 int s, i;
5836 int count = 0;
5837 int buckets[64];
5838
5839 if (CLI_HELP_REQUESTED)
5840 return CLI_HELP_NO_ARGS;
5841
5842 time(&time_now);
5843 for (i = 0; i < 64;++i) buckets[i] = 0;
5844
5845 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5846 {
5847 int open = 0, d;
5848 if (!session[s].opened)
5849 continue;
5850
5851 d = time_now - session[s].opened;
5852 if (d < 0)
5853 d = 0;
5854 while (d > 1 && open < 32)
5855 {
5856 ++open;
5857 d >>= 1; // half.
5858 }
5859 ++count;
5860 ++buckets[open];
5861 }
5862
5863 s = 1;
5864 for (i = 0; i < 30; ++i)
5865 {
5866 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5867 s <<= 1;
5868 }
5869 cli_print(cli, "%d total sessions open.", count);
5870 return CLI_OK;
5871 }
5872
5873 /* Unhide an avp.
5874 *
5875 * This unencodes the AVP using the L2TP secret and the previously
5876 * stored random vector. It overwrites the hidden data with the
5877 * unhidden AVP subformat.
5878 */
5879 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5880 {
5881 MD5_CTX ctx;
5882 uint8_t digest[16];
5883 uint8_t *last;
5884 size_t d = 0;
5885 uint16_t m = htons(type);
5886
5887 // Compute initial pad
5888 MD5_Init(&ctx);
5889 MD5_Update(&ctx, (unsigned char *) &m, 2);
5890 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5891 MD5_Update(&ctx, vector, vec_len);
5892 MD5_Final(digest, &ctx);
5893
5894 // pointer to last decoded 16 octets
5895 last = value;
5896
5897 while (len > 0)
5898 {
5899 // calculate a new pad based on the last decoded block
5900 if (d >= sizeof(digest))
5901 {
5902 MD5_Init(&ctx);
5903 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5904 MD5_Update(&ctx, last, sizeof(digest));
5905 MD5_Final(digest, &ctx);
5906
5907 d = 0;
5908 last = value;
5909 }
5910
5911 *value++ ^= digest[d++];
5912 len--;
5913 }
5914 }
5915
5916 int find_filter(char const *name, size_t len)
5917 {
5918 int free = -1;
5919 int i;
5920
5921 for (i = 0; i < MAXFILTER; i++)
5922 {
5923 if (!*ip_filters[i].name)
5924 {
5925 if (free < 0)
5926 free = i;
5927
5928 continue;
5929 }
5930
5931 if (strlen(ip_filters[i].name) != len)
5932 continue;
5933
5934 if (!strncmp(ip_filters[i].name, name, len))
5935 return i;
5936 }
5937
5938 return free;
5939 }
5940
5941 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5942 {
5943 switch (p->op)
5944 {
5945 case FILTER_PORT_OP_EQ: return port == p->port;
5946 case FILTER_PORT_OP_NEQ: return port != p->port;
5947 case FILTER_PORT_OP_GT: return port > p->port;
5948 case FILTER_PORT_OP_LT: return port < p->port;
5949 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5950 }
5951
5952 return 0;
5953 }
5954
5955 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5956 {
5957 switch (op)
5958 {
5959 case FILTER_FLAG_OP_ANY:
5960 return (flags & sflags) || (~flags & cflags);
5961
5962 case FILTER_FLAG_OP_ALL:
5963 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5964
5965 case FILTER_FLAG_OP_EST:
5966 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5967 }
5968
5969 return 0;
5970 }
5971
5972 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5973 {
5974 uint16_t frag_offset;
5975 uint8_t proto;
5976 in_addr_t src_ip;
5977 in_addr_t dst_ip;
5978 uint16_t src_port = 0;
5979 uint16_t dst_port = 0;
5980 uint8_t flags = 0;
5981 ip_filter_rulet *rule;
5982
5983 if (len < 20) // up to end of destination address
5984 return 0;
5985
5986 if ((*buf >> 4) != 4) // IPv4
5987 return 0;
5988
5989 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5990 proto = buf[9];
5991 src_ip = *(in_addr_t *) (buf + 12);
5992 dst_ip = *(in_addr_t *) (buf + 16);
5993
5994 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5995 {
5996 int l = (buf[0] & 0xf) * 4; // length of IP header
5997 if (len < l + 4) // ports
5998 return 0;
5999
6000 src_port = ntohs(*(uint16_t *) (buf + l));
6001 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6002 if (proto == IPPROTO_TCP)
6003 {
6004 if (len < l + 14) // flags
6005 return 0;
6006
6007 flags = buf[l + 13] & 0x3f;
6008 }
6009 }
6010
6011 for (rule = ip_filters[filter].rules; rule->action; rule++)
6012 {
6013 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6014 continue;
6015
6016 if (rule->src_wild != INADDR_BROADCAST &&
6017 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6018 continue;
6019
6020 if (rule->dst_wild != INADDR_BROADCAST &&
6021 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6022 continue;
6023
6024 if (frag_offset)
6025 {
6026 // layer 4 deny rules are skipped
6027 if (rule->action == FILTER_ACTION_DENY &&
6028 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6029 continue;
6030 }
6031 else
6032 {
6033 if (rule->frag)
6034 continue;
6035
6036 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6037 {
6038 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6039 continue;
6040
6041 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6042 continue;
6043
6044 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6045 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6046 continue;
6047 }
6048 }
6049
6050 // matched
6051 rule->counter++;
6052 return rule->action == FILTER_ACTION_PERMIT;
6053 }
6054
6055 // default deny
6056 return 0;
6057 }