a1819f21a73ab6dafaf433a5c8e822e345f6e5c5
[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 #include <arpa/inet.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <linux/if_tun.h>
12 #define SYSLOG_NAMES
13 #include <syslog.h>
14 #include <malloc.h>
15 #include <net/route.h>
16 #include <sys/mman.h>
17 #include <netdb.h>
18 #include <netinet/in.h>
19 #include <netinet/ip6.h>
20 #include <stdarg.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/wait.h>
31 #include <net/if.h>
32 #include <stddef.h>
33 #include <time.h>
34 #include <dlfcn.h>
35 #include <unistd.h>
36 #include <sched.h>
37 #include <sys/sysinfo.h>
38 #include <libcli.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
41
42 #include "md5.h"
43 #include "l2tpns.h"
44 #include "cluster.h"
45 #include "plugin.h"
46 #include "ll.h"
47 #include "constants.h"
48 #include "control.h"
49 #include "util.h"
50 #include "tbf.h"
51
52 #ifdef BGP
53 #include "bgp.h"
54 #endif
55
56 #ifdef LAC
57 #include "l2tplac.h"
58 #endif
59 #include "pppoe.h"
60
61 #ifdef LAC
62 char * Vendor_name = "Linux L2TPNS";
63 uint32_t call_serial_number = 0;
64 #endif
65
66 // Globals
67 configt *config = NULL; // all configuration
68 int nlfd = -1; // netlink socket
69 int tunfd = -1; // tun interface file handle. (network device)
70 int udpfd = -1; // UDP file handle
71 #ifdef LAC
72 int udplacfd = -1; // UDP LAC file handle
73 #endif
74 int controlfd = -1; // Control signal handle
75 int clifd = -1; // Socket listening for CLI connections.
76 int daefd = -1; // Socket listening for DAE connections.
77 int snoopfd = -1; // UDP file handle for sending out intercept data
78 int *radfds = NULL; // RADIUS requests file handles
79 int rand_fd = -1; // Random data source
80 int cluster_sockfd = -1; // Intra-cluster communications socket.
81 int epollfd = -1; // event polling
82 time_t basetime = 0; // base clock
83 char hostname[MAXHOSTNAME] = ""; // us.
84 static int tunidx; // ifr_ifindex of tun device
85 int nlseqnum = 0; // netlink sequence number
86 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
87 static int syslog_log = 0; // are we logging to syslog
88 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
89 uint32_t last_id = 0; // Unique ID for radius accounting
90 // Guest change
91 char guest_users[10][32]; // Array of guest users
92 int guest_accounts_num = 0; // Number of guest users
93
94 // calculated from config->l2tp_mtu
95 uint16_t MRU = 0; // PPP MRU
96 uint16_t MSS = 0; // TCP MSS
97
98 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
99 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
100
101 union iphash {
102 sessionidt sess;
103 union iphash *idx;
104 } ip_hash[256]; // Mapping from IP address to session structures.
105
106 struct ipv6radix {
107 sessionidt sess;
108 struct ipv6radix *branch;
109 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
110
111 // Traffic counters.
112 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
113 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
114 uint32_t eth_tx = 0;
115
116 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
117 time_t time_now = 0; // Current time in seconds since epoch.
118 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
119 static char time_now_string[64] = {0}; // Current time as a string.
120 static int time_changed = 0; // time_now changed
121 char main_quit = 0; // True if we're in the process of exiting.
122 static char main_reload = 0; // Re-load pending
123 linked_list *loaded_plugins;
124 linked_list *plugins[MAX_PLUGIN_TYPES];
125
126 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
127 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
128
129 config_descriptt config_values[] = {
130 CONFIG("debug", debug, INT),
131 CONFIG("log_file", log_filename, STRING),
132 CONFIG("pid_file", pid_file, STRING),
133 CONFIG("random_device", random_device, STRING),
134 CONFIG("l2tp_secret", l2tp_secret, STRING),
135 CONFIG("l2tp_mtu", l2tp_mtu, INT),
136 CONFIG("ppp_restart_time", ppp_restart_time, INT),
137 CONFIG("ppp_max_configure", ppp_max_configure, INT),
138 CONFIG("ppp_max_failure", ppp_max_failure, INT),
139 CONFIG("primary_dns", default_dns1, IPv4),
140 CONFIG("secondary_dns", default_dns2, IPv4),
141 CONFIG("primary_radius", radiusserver[0], IPv4),
142 CONFIG("secondary_radius", radiusserver[1], IPv4),
143 CONFIG("primary_radius_port", radiusport[0], SHORT),
144 CONFIG("secondary_radius_port", radiusport[1], SHORT),
145 CONFIG("radius_accounting", radius_accounting, BOOL),
146 CONFIG("radius_interim", radius_interim, INT),
147 CONFIG("radius_secret", radiussecret, STRING),
148 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
149 CONFIG("radius_dae_port", radius_dae_port, SHORT),
150 CONFIG("radius_bind_min", radius_bind_min, SHORT),
151 CONFIG("radius_bind_max", radius_bind_max, SHORT),
152 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
153 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
154 CONFIG("guest_account", guest_user, STRING),
155 CONFIG("bind_address", bind_address, IPv4),
156 CONFIG("peer_address", peer_address, IPv4),
157 CONFIG("send_garp", send_garp, BOOL),
158 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
159 CONFIG("throttle_buckets", num_tbfs, INT),
160 CONFIG("accounting_dir", accounting_dir, STRING),
161 CONFIG("dump_speed", dump_speed, BOOL),
162 CONFIG("multi_read_count", multi_read_count, INT),
163 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
164 CONFIG("lock_pages", lock_pages, BOOL),
165 CONFIG("icmp_rate", icmp_rate, INT),
166 CONFIG("packet_limit", max_packets, INT),
167 CONFIG("cluster_address", cluster_address, IPv4),
168 CONFIG("cluster_interface", cluster_interface, STRING),
169 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
170 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
171 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
172 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
173 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
174 CONFIG("cli_bind_address", cli_bind_address, IPv4),
175 CONFIG("hostname", hostname, STRING),
176 #ifdef BGP
177 CONFIG("nexthop_address", nexthop_address, IPv4),
178 CONFIG("nexthop6_address", nexthop6_address, IPv6),
179 #endif
180 CONFIG("echo_timeout", echo_timeout, INT),
181 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
182 CONFIG("iftun_address", iftun_address, IPv4),
183 CONFIG("tundevicename", tundevicename, STRING),
184 #ifdef LAC
185 CONFIG("disable_lac_func", disable_lac_func, BOOL),
186 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src, BOOL),
187 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
188 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
189 #endif
190 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind, STRING),
191 CONFIG("pppoe_service_name", pppoe_service_name, STRING),
192 CONFIG("pppoe_ac_name", pppoe_ac_name, STRING),
193 { NULL, 0, 0, 0 },
194 };
195
196 static char *plugin_functions[] = {
197 NULL,
198 "plugin_pre_auth",
199 "plugin_post_auth",
200 "plugin_timer",
201 "plugin_new_session",
202 "plugin_kill_session",
203 "plugin_control",
204 "plugin_radius_response",
205 "plugin_radius_reset",
206 "plugin_radius_account",
207 "plugin_become_master",
208 "plugin_new_session_master",
209 };
210
211 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
212
213 // Counters for shutdown sessions
214 static sessiont shut_acct[8192];
215 static sessionidt shut_acct_n = 0;
216
217 tunnelt *tunnel = NULL; // Array of tunnel structures.
218 bundlet *bundle = NULL; // Array of bundle structures.
219 fragmentationt *frag = NULL; // Array of fragmentation structures.
220 sessiont *session = NULL; // Array of session structures.
221 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
222 radiust *radius = NULL; // Array of radius structures.
223 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
224 ip_filtert *ip_filters = NULL; // Array of named filters.
225 static controlt *controlfree = 0;
226 struct Tstats *_statistics = NULL;
227 #ifdef RINGBUFFER
228 struct Tringbuffer *ringbuffer = NULL;
229 #endif
230
231 static ssize_t netlink_send(struct nlmsghdr *nh);
232 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
233 static void cache_ipmap(in_addr_t ip, sessionidt s);
234 static void uncache_ipmap(in_addr_t ip);
235 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
236 static void free_ip_address(sessionidt s);
237 static void dump_acct_info(int all);
238 static void sighup_handler(int sig);
239 static void shutdown_handler(int sig);
240 static void sigchild_handler(int sig);
241 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
242 static void update_config(void);
243 static void read_config_file(void);
244 static void initplugins(void);
245 static int add_plugin(char *plugin_name);
246 static int remove_plugin(char *plugin_name);
247 static void plugins_done(void);
248 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
249 static tunnelidt new_tunnel(void);
250 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
251 static void bundleclear(bundleidt b);
252
253 // return internal time (10ths since process startup), set f if given
254 // as a side-effect sets time_now, and time_changed
255 static clockt now(double *f)
256 {
257 struct timeval t;
258 gettimeofday(&t, 0);
259 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
260 if (t.tv_sec != time_now)
261 {
262 time_now = t.tv_sec;
263 time_changed++;
264 }
265
266 // Time in milliseconds
267 // TODO FOR MLPPP DEV
268 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
269
270 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
271 }
272
273 // work out a retry time based on try number
274 // This is a straight bounded exponential backoff.
275 // Maximum re-try time is 32 seconds. (2^5).
276 clockt backoff(uint8_t try)
277 {
278 if (try > 5) try = 5; // max backoff
279 return now(NULL) + 10 * (1 << try);
280 }
281
282
283 //
284 // Log a debug message. Typically called via the LOG macro
285 //
286 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
287 {
288 static char message[65536] = {0};
289 va_list ap;
290
291 #ifdef RINGBUFFER
292 if (ringbuffer)
293 {
294 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
295 ringbuffer->tail = 0;
296 if (ringbuffer->tail == ringbuffer->head)
297 if (++ringbuffer->head >= RINGBUFFER_SIZE)
298 ringbuffer->head = 0;
299
300 ringbuffer->buffer[ringbuffer->tail].level = level;
301 ringbuffer->buffer[ringbuffer->tail].session = s;
302 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
303 va_start(ap, format);
304 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
305 va_end(ap);
306 }
307 #endif
308
309 if (config->debug < level) return;
310
311 va_start(ap, format);
312 vsnprintf(message, sizeof(message), format, ap);
313
314 if (log_stream)
315 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
316 else if (syslog_log)
317 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
318
319 va_end(ap);
320 }
321
322 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
323 {
324 int i, j;
325 const uint8_t *d = data;
326
327 if (config->debug < level) return;
328
329 // No support for _log_hex to syslog
330 if (log_stream)
331 {
332 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
333 setvbuf(log_stream, NULL, _IOFBF, 16384);
334
335 for (i = 0; i < maxsize; )
336 {
337 fprintf(log_stream, "%4X: ", i);
338 for (j = i; j < maxsize && j < (i + 16); j++)
339 {
340 fprintf(log_stream, "%02X ", d[j]);
341 if (j == i + 7)
342 fputs(": ", log_stream);
343 }
344
345 for (; j < i + 16; j++)
346 {
347 fputs(" ", log_stream);
348 if (j == i + 7)
349 fputs(": ", log_stream);
350 }
351
352 fputs(" ", log_stream);
353 for (j = i; j < maxsize && j < (i + 16); j++)
354 {
355 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
356 fputc(d[j], log_stream);
357 else
358 fputc('.', log_stream);
359
360 if (j == i + 7)
361 fputs(" ", log_stream);
362 }
363
364 i = j;
365 fputs("\n", log_stream);
366 }
367
368 fflush(log_stream);
369 setbuf(log_stream, NULL);
370 }
371 }
372
373 // update a counter, accumulating 2^32 wraps
374 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
375 {
376 uint32_t new = *counter + delta;
377 if (new < *counter)
378 (*wrap)++;
379
380 *counter = new;
381 }
382
383 // initialise the random generator
384 static void initrandom(char *source)
385 {
386 static char path[sizeof(config->random_device)] = "*undefined*";
387
388 // reinitialise only if we are forced to do so or if the config has changed
389 if (source && !strncmp(path, source, sizeof(path)))
390 return;
391
392 // close previous source, if any
393 if (rand_fd >= 0)
394 close(rand_fd);
395
396 rand_fd = -1;
397
398 if (source)
399 {
400 // register changes
401 snprintf(path, sizeof(path), "%s", source);
402
403 if (*path == '/')
404 {
405 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
406 if (rand_fd < 0)
407 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
408 path, strerror(errno));
409 }
410 }
411 }
412
413 // fill buffer with random data
414 void random_data(uint8_t *buf, int len)
415 {
416 int n = 0;
417
418 CSTAT(random_data);
419 if (rand_fd >= 0)
420 {
421 n = read(rand_fd, buf, len);
422 if (n >= len) return;
423 if (n < 0)
424 {
425 if (errno != EAGAIN)
426 {
427 LOG(0, 0, 0, "Error reading from random source: %s\n",
428 strerror(errno));
429
430 // fall back to rand()
431 initrandom(NULL);
432 }
433
434 n = 0;
435 }
436 }
437
438 // append missing data
439 while (n < len)
440 // not using the low order bits from the prng stream
441 buf[n++] = (rand() >> 4) & 0xff;
442 }
443
444 // Add a route
445 //
446 // This adds it to the routing table, advertises it
447 // via BGP if enabled, and stuffs it into the
448 // 'sessionbyip' cache.
449 //
450 // 'ip' must be in _host_ order.
451 //
452 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
453 {
454 struct {
455 struct nlmsghdr nh;
456 struct rtmsg rt;
457 char buf[32];
458 } req;
459 int i;
460 in_addr_t n_ip;
461
462 if (!prefixlen) prefixlen = 32;
463
464 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
465
466 memset(&req, 0, sizeof(req));
467
468 if (add)
469 {
470 req.nh.nlmsg_type = RTM_NEWROUTE;
471 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
472 }
473 else
474 {
475 req.nh.nlmsg_type = RTM_DELROUTE;
476 req.nh.nlmsg_flags = NLM_F_REQUEST;
477 }
478
479 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
480
481 req.rt.rtm_family = AF_INET;
482 req.rt.rtm_dst_len = prefixlen;
483 req.rt.rtm_table = RT_TABLE_MAIN;
484 req.rt.rtm_protocol = 42;
485 req.rt.rtm_scope = RT_SCOPE_LINK;
486 req.rt.rtm_type = RTN_UNICAST;
487
488 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
489 n_ip = htonl(ip);
490 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
491 if (gw)
492 {
493 n_ip = htonl(gw);
494 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
495 }
496
497 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
498 fmtaddr(htonl(ip), 0), prefixlen,
499 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
500
501 if (netlink_send(&req.nh) < 0)
502 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
503
504 #ifdef BGP
505 if (add)
506 bgp_add_route(htonl(ip), prefixlen);
507 else
508 bgp_del_route(htonl(ip), prefixlen);
509 #endif /* BGP */
510
511 // Add/Remove the IPs to the 'sessionbyip' cache.
512 // Note that we add the zero address in the case of
513 // a network route. Roll on CIDR.
514
515 // Note that 's == 0' implies this is the address pool.
516 // We still cache it here, because it will pre-fill
517 // the malloc'ed tree.
518
519 if (s)
520 {
521 if (!add) // Are we deleting a route?
522 s = 0; // Caching the session as '0' is the same as uncaching.
523
524 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
525 cache_ipmap(i, s);
526 }
527 }
528
529 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
530 {
531 struct {
532 struct nlmsghdr nh;
533 struct rtmsg rt;
534 char buf[64];
535 } req;
536 int metric;
537 char ipv6addr[INET6_ADDRSTRLEN];
538
539 if (!config->ipv6_prefix.s6_addr[0])
540 {
541 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
542 return;
543 }
544
545 memset(&req, 0, sizeof(req));
546
547 if (add)
548 {
549 req.nh.nlmsg_type = RTM_NEWROUTE;
550 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
551 }
552 else
553 {
554 req.nh.nlmsg_type = RTM_DELROUTE;
555 req.nh.nlmsg_flags = NLM_F_REQUEST;
556 }
557
558 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
559
560 req.rt.rtm_family = AF_INET6;
561 req.rt.rtm_dst_len = prefixlen;
562 req.rt.rtm_table = RT_TABLE_MAIN;
563 req.rt.rtm_protocol = 42;
564 req.rt.rtm_scope = RT_SCOPE_LINK;
565 req.rt.rtm_type = RTN_UNICAST;
566
567 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
568 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
569 metric = 1;
570 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
571
572 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
573 add ? "add" : "del",
574 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
575 prefixlen);
576
577 if (netlink_send(&req.nh) < 0)
578 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
579
580 #ifdef BGP
581 if (add)
582 bgp_add_route6(ip, prefixlen);
583 else
584 bgp_del_route6(ip, prefixlen);
585 #endif /* BGP */
586
587 if (s)
588 {
589 if (!add) // Are we deleting a route?
590 s = 0; // Caching the session as '0' is the same as uncaching.
591
592 cache_ipv6map(ip, prefixlen, s);
593 }
594
595 return;
596 }
597
598 //
599 // Set up netlink socket
600 static void initnetlink(void)
601 {
602 struct sockaddr_nl nladdr;
603
604 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
605 if (nlfd < 0)
606 {
607 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
608 exit(1);
609 }
610
611 memset(&nladdr, 0, sizeof(nladdr));
612 nladdr.nl_family = AF_NETLINK;
613 nladdr.nl_pid = getpid();
614
615 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
616 {
617 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
618 exit(1);
619 }
620 }
621
622 static ssize_t netlink_send(struct nlmsghdr *nh)
623 {
624 struct sockaddr_nl nladdr;
625 struct iovec iov;
626 struct msghdr msg;
627
628 nh->nlmsg_pid = getpid();
629 nh->nlmsg_seq = ++nlseqnum;
630
631 // set kernel address
632 memset(&nladdr, 0, sizeof(nladdr));
633 nladdr.nl_family = AF_NETLINK;
634
635 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
636 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
637
638 return sendmsg(nlfd, &msg, 0);
639 }
640
641 static ssize_t netlink_recv(void *buf, ssize_t len)
642 {
643 struct sockaddr_nl nladdr;
644 struct iovec iov;
645 struct msghdr msg;
646
647 // set kernel address
648 memset(&nladdr, 0, sizeof(nladdr));
649 nladdr.nl_family = AF_NETLINK;
650
651 iov = (struct iovec){ buf, len };
652 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
653
654 return recvmsg(nlfd, &msg, 0);
655 }
656
657 /* adapted from iproute2 */
658 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
659 {
660 int len = RTA_LENGTH(alen);
661 struct rtattr *rta;
662
663 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
664 rta->rta_type = type;
665 rta->rta_len = len;
666 memcpy(RTA_DATA(rta), data, alen);
667 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
668 }
669
670 // messages corresponding to different phases seq number
671 static char *tun_nl_phase_msg[] = {
672 "initialized",
673 "getting tun interface index",
674 "setting tun interface parameters",
675 "setting tun IPv4 address",
676 "setting tun LL IPv6 address",
677 "setting tun global IPv6 address",
678 };
679
680 //
681 // Set up TUN interface
682 static void inittun(void)
683 {
684 struct ifreq ifr;
685
686 memset(&ifr, 0, sizeof(ifr));
687 ifr.ifr_flags = IFF_TUN;
688
689 tunfd = open(TUNDEVICE, O_RDWR);
690 if (tunfd < 0)
691 { // fatal
692 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
693 exit(1);
694 }
695 {
696 int flags = fcntl(tunfd, F_GETFL, 0);
697 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
698 }
699
700 if (*config->tundevicename)
701 strncpy(ifr.ifr_name, config->tundevicename, IFNAMSIZ);
702
703 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
704 {
705 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
706 exit(1);
707 }
708 assert(strlen(ifr.ifr_name) < sizeof(config->tundevicename) - 1);
709 strncpy(config->tundevicename, ifr.ifr_name, sizeof(config->tundevicename));
710
711 tunidx = if_nametoindex(config->tundevicename);
712 if (tunidx == 0)
713 {
714 LOG(0, 0, 0, "Can't get tun interface index\n");
715 exit(1);
716 }
717
718 {
719 struct {
720 // interface setting
721 struct nlmsghdr nh;
722 union {
723 struct ifinfomsg ifinfo;
724 struct ifaddrmsg ifaddr;
725 } ifmsg;
726 char rtdata[32]; // 32 should be enough
727 } req;
728 uint32_t txqlen, mtu;
729 in_addr_t ip;
730
731 memset(&req, 0, sizeof(req));
732
733 req.nh.nlmsg_type = RTM_NEWLINK;
734 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
735 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
736
737 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
738 req.ifmsg.ifinfo.ifi_index = tunidx;
739 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
740 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
741
742 /* Bump up the qlen to deal with bursts from the network */
743 txqlen = 1000;
744 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
745 /* set MTU to modem MRU */
746 mtu = MRU;
747 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
748
749 if (netlink_send(&req.nh) < 0)
750 goto senderror;
751
752 memset(&req, 0, sizeof(req));
753
754 req.nh.nlmsg_type = RTM_NEWADDR;
755 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
756 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
757
758 req.ifmsg.ifaddr.ifa_family = AF_INET;
759 req.ifmsg.ifaddr.ifa_prefixlen = 32;
760 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
761 req.ifmsg.ifaddr.ifa_index = tunidx;
762
763 if (config->iftun_address)
764 ip = config->iftun_address;
765 else
766 ip = 0x01010101; // 1.1.1.1
767 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
768
769 if (netlink_send(&req.nh) < 0)
770 goto senderror;
771
772 // Only setup IPv6 on the tun device if we have a configured prefix
773 if (config->ipv6_prefix.s6_addr[0]) {
774 struct in6_addr ip6;
775
776 memset(&req, 0, sizeof(req));
777
778 req.nh.nlmsg_type = RTM_NEWADDR;
779 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
780 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
781
782 req.ifmsg.ifaddr.ifa_family = AF_INET6;
783 req.ifmsg.ifaddr.ifa_prefixlen = 64;
784 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
785 req.ifmsg.ifaddr.ifa_index = tunidx;
786
787 // Link local address is FE80::1
788 memset(&ip6, 0, sizeof(ip6));
789 ip6.s6_addr[0] = 0xFE;
790 ip6.s6_addr[1] = 0x80;
791 ip6.s6_addr[15] = 1;
792 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
793
794 if (netlink_send(&req.nh) < 0)
795 goto senderror;
796
797 memset(&req, 0, sizeof(req));
798
799 req.nh.nlmsg_type = RTM_NEWADDR;
800 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
801 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
802
803 req.ifmsg.ifaddr.ifa_family = AF_INET6;
804 req.ifmsg.ifaddr.ifa_prefixlen = 64;
805 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
806 req.ifmsg.ifaddr.ifa_index = tunidx;
807
808 // Global address is prefix::1
809 ip6 = config->ipv6_prefix;
810 ip6.s6_addr[15] = 1;
811 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
812
813 if (netlink_send(&req.nh) < 0)
814 goto senderror;
815 }
816
817 memset(&req, 0, sizeof(req));
818
819 req.nh.nlmsg_type = NLMSG_DONE;
820 req.nh.nlmsg_len = NLMSG_LENGTH(0);
821
822 if (netlink_send(&req.nh) < 0)
823 goto senderror;
824
825 // if we get an error for seqnum < min_initok_nlseqnum,
826 // we must exit as initialization went wrong
827 if (config->ipv6_prefix.s6_addr[0])
828 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
829 else
830 min_initok_nlseqnum = 3 + 1; // idx + if + addr
831 }
832
833 return;
834
835 senderror:
836 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
837 exit(1);
838 }
839
840 // set up UDP ports
841 static void initudp(void)
842 {
843 int on = 1;
844 struct sockaddr_in addr;
845
846 // Tunnel
847 memset(&addr, 0, sizeof(addr));
848 addr.sin_family = AF_INET;
849 addr.sin_port = htons(L2TPPORT);
850 addr.sin_addr.s_addr = config->bind_address;
851 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
852 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
853 {
854 int flags = fcntl(udpfd, F_GETFL, 0);
855 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
856 }
857 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
858 {
859 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
860 exit(1);
861 }
862
863 // Control
864 memset(&addr, 0, sizeof(addr));
865 addr.sin_family = AF_INET;
866 addr.sin_port = htons(NSCTL_PORT);
867 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
868 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
869 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
870 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
871 {
872 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
873 exit(1);
874 }
875
876 // Dynamic Authorization Extensions to RADIUS
877 memset(&addr, 0, sizeof(addr));
878 addr.sin_family = AF_INET;
879 addr.sin_port = htons(config->radius_dae_port);
880 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
881 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
882 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
883 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
884 {
885 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
886 exit(1);
887 }
888
889 #ifdef LAC
890 // Tunnel to Remote LNS
891 memset(&addr, 0, sizeof(addr));
892 addr.sin_family = AF_INET;
893 addr.sin_port = htons(config->bind_portremotelns);
894 addr.sin_addr.s_addr = config->bind_address_remotelns;
895 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
896 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
897 {
898 int flags = fcntl(udplacfd, F_GETFL, 0);
899 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
900 }
901 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
902 {
903 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
904 exit(1);
905 }
906 #endif
907
908 // Intercept
909 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
910 }
911
912 //
913 // Find session by IP, < 1 for not found
914 //
915 // Confusingly enough, this 'ip' must be
916 // in _network_ order. This being the common
917 // case when looking it up from IP packet headers.
918 //
919 // We actually use this cache for two things.
920 // #1. For used IP addresses, this maps to the
921 // session ID that it's used by.
922 // #2. For un-used IP addresses, this maps to the
923 // index into the pool table that contains that
924 // IP address.
925 //
926
927 static sessionidt lookup_ipmap(in_addr_t ip)
928 {
929 uint8_t *a = (uint8_t *) &ip;
930 union iphash *h = ip_hash;
931
932 if (!(h = h[*a++].idx)) return 0;
933 if (!(h = h[*a++].idx)) return 0;
934 if (!(h = h[*a++].idx)) return 0;
935
936 return h[*a].sess;
937 }
938
939 static sessionidt lookup_ipv6map(struct in6_addr ip)
940 {
941 struct ipv6radix *curnode;
942 int i;
943 int s;
944 char ipv6addr[INET6_ADDRSTRLEN];
945
946 curnode = &ipv6_hash[ip.s6_addr[0]];
947 i = 1;
948 s = curnode->sess;
949
950 while (s == 0 && i < 15 && curnode->branch != NULL)
951 {
952 curnode = &curnode->branch[ip.s6_addr[i]];
953 s = curnode->sess;
954 i++;
955 }
956
957 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
958 inet_ntop(AF_INET6, &ip, ipv6addr,
959 INET6_ADDRSTRLEN),
960 s);
961
962 return s;
963 }
964
965 sessionidt sessionbyip(in_addr_t ip)
966 {
967 sessionidt s = lookup_ipmap(ip);
968 CSTAT(sessionbyip);
969
970 if (s > 0 && s < MAXSESSION && session[s].opened)
971 return s;
972
973 return 0;
974 }
975
976 sessionidt sessionbyipv6(struct in6_addr ip)
977 {
978 sessionidt s;
979 CSTAT(sessionbyipv6);
980
981 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
982 (ip.s6_addr[0] == 0xFE &&
983 ip.s6_addr[1] == 0x80 &&
984 ip.s6_addr16[1] == 0 &&
985 ip.s6_addr16[2] == 0 &&
986 ip.s6_addr16[3] == 0)) {
987 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
988 } else {
989 s = lookup_ipv6map(ip);
990 }
991
992 if (s > 0 && s < MAXSESSION && session[s].opened)
993 return s;
994
995 return 0;
996 }
997
998 //
999 // Take an IP address in HOST byte order and
1000 // add it to the sessionid by IP cache.
1001 //
1002 // (It's actually cached in network order)
1003 //
1004 static void cache_ipmap(in_addr_t ip, sessionidt s)
1005 {
1006 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1007 uint8_t *a = (uint8_t *) &nip;
1008 union iphash *h = ip_hash;
1009 int i;
1010
1011 for (i = 0; i < 3; i++)
1012 {
1013 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1014 return;
1015
1016 h = h[a[i]].idx;
1017 }
1018
1019 h[a[3]].sess = s;
1020
1021 if (s > 0)
1022 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1023
1024 else if (s == 0)
1025 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1026 // else a map to an ip pool index.
1027 }
1028
1029 static void uncache_ipmap(in_addr_t ip)
1030 {
1031 cache_ipmap(ip, 0); // Assign it to the NULL session.
1032 }
1033
1034 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1035 {
1036 int i;
1037 int bytes;
1038 struct ipv6radix *curnode;
1039 char ipv6addr[INET6_ADDRSTRLEN];
1040
1041 curnode = &ipv6_hash[ip.s6_addr[0]];
1042
1043 bytes = prefixlen >> 3;
1044 i = 1;
1045 while (i < bytes) {
1046 if (curnode->branch == NULL)
1047 {
1048 if (!(curnode->branch = calloc(256,
1049 sizeof (struct ipv6radix))))
1050 return;
1051 }
1052 curnode = &curnode->branch[ip.s6_addr[i]];
1053 i++;
1054 }
1055
1056 curnode->sess = s;
1057
1058 if (s > 0)
1059 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1060 inet_ntop(AF_INET6, &ip, ipv6addr,
1061 INET6_ADDRSTRLEN),
1062 prefixlen);
1063 else if (s == 0)
1064 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1065 inet_ntop(AF_INET6, &ip, ipv6addr,
1066 INET6_ADDRSTRLEN),
1067 prefixlen);
1068 }
1069
1070 //
1071 // CLI list to dump current ipcache.
1072 //
1073 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1074 {
1075 union iphash *d = ip_hash, *e, *f, *g;
1076 int i, j, k, l;
1077 int count = 0;
1078
1079 if (CLI_HELP_REQUESTED)
1080 return CLI_HELP_NO_ARGS;
1081
1082 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1083
1084 for (i = 0; i < 256; ++i)
1085 {
1086 if (!d[i].idx)
1087 continue;
1088
1089 e = d[i].idx;
1090 for (j = 0; j < 256; ++j)
1091 {
1092 if (!e[j].idx)
1093 continue;
1094
1095 f = e[j].idx;
1096 for (k = 0; k < 256; ++k)
1097 {
1098 if (!f[k].idx)
1099 continue;
1100
1101 g = f[k].idx;
1102 for (l = 0; l < 256; ++l)
1103 {
1104 if (!g[l].sess)
1105 continue;
1106
1107 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1108 ++count;
1109 }
1110 }
1111 }
1112 }
1113 cli_print(cli, "%d entries in cache", count);
1114 return CLI_OK;
1115 }
1116
1117
1118 // Find session by username, 0 for not found
1119 // walled garden users aren't authenticated, so the username is
1120 // reasonably useless. Ignore them to avoid incorrect actions
1121 //
1122 // This is VERY inefficent. Don't call it often. :)
1123 //
1124 sessionidt sessionbyuser(char *username)
1125 {
1126 int s;
1127 CSTAT(sessionbyuser);
1128
1129 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1130 {
1131 if (!session[s].opened)
1132 continue;
1133
1134 if (session[s].walled_garden)
1135 continue; // Skip walled garden users.
1136
1137 if (!strncmp(session[s].user, username, 128))
1138 return s;
1139
1140 }
1141 return 0; // Not found.
1142 }
1143
1144 void send_garp(in_addr_t ip)
1145 {
1146 int s;
1147 struct ifreq ifr;
1148 uint8_t mac[6];
1149
1150 s = socket(PF_INET, SOCK_DGRAM, 0);
1151 if (s < 0)
1152 {
1153 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1154 return;
1155 }
1156 memset(&ifr, 0, sizeof(ifr));
1157 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1158 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1159 {
1160 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1161 close(s);
1162 return;
1163 }
1164 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1165 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1166 {
1167 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1168 close(s);
1169 return;
1170 }
1171 close(s);
1172 sendarp(ifr.ifr_ifindex, mac, ip);
1173 }
1174
1175 static sessiont *sessiontbysessionidt(sessionidt s)
1176 {
1177 if (!s || s >= MAXSESSION) return NULL;
1178 return &session[s];
1179 }
1180
1181 static sessionidt sessionidtbysessiont(sessiont *s)
1182 {
1183 sessionidt val = s-session;
1184 if (s < session || val >= MAXSESSION) return 0;
1185 return val;
1186 }
1187
1188 // actually send a control message for a specific tunnel
1189 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1190 {
1191 struct sockaddr_in addr;
1192
1193 CSTAT(tunnelsend);
1194
1195 if (!t)
1196 {
1197 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1198 STAT(tunnel_tx_errors);
1199 return;
1200 }
1201
1202 if (t == TUNNEL_ID_PPPOE)
1203 {
1204 pppoe_sess_send(buf, l, t);
1205 return;
1206 }
1207
1208 if (!tunnel[t].ip)
1209 {
1210 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1211 STAT(tunnel_tx_errors);
1212 return;
1213 }
1214
1215 memset(&addr, 0, sizeof(addr));
1216 addr.sin_family = AF_INET;
1217 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1218 addr.sin_port = htons(tunnel[t].port);
1219
1220 // sequence expected, if sequence in message
1221 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1222
1223 // If this is a control message, deal with retries
1224 if (*buf & 0x80)
1225 {
1226 tunnel[t].last = time_now; // control message sent
1227 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1228 if (tunnel[t].try)
1229 {
1230 STAT(tunnel_retries);
1231 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1232 }
1233 }
1234 #ifdef LAC
1235 if (sendto((tunnel[t].isremotelns?udplacfd:udpfd), buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1236 #else
1237 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1238 #endif
1239 {
1240 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1241 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1242 STAT(tunnel_tx_errors);
1243 return;
1244 }
1245
1246 LOG_HEX(5, "Send Tunnel Data", buf, l);
1247 STAT(tunnel_tx_packets);
1248 INC_STAT(tunnel_tx_bytes, l);
1249 }
1250
1251 //
1252 // Tiny helper function to write data to
1253 // the 'tun' device.
1254 //
1255 int tun_write(uint8_t * data, int size)
1256 {
1257 return write(tunfd, data, size);
1258 }
1259
1260 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1261 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1262 {
1263 int d = (tcp[12] >> 4) * 4;
1264 uint8_t *mss = 0;
1265 uint8_t *opts;
1266 uint8_t *data;
1267 uint16_t orig;
1268 uint32_t sum;
1269
1270 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1271 return;
1272
1273 if (tcp + d > buf + len) // short?
1274 return;
1275
1276 opts = tcp + 20;
1277 data = tcp + d;
1278
1279 while (opts < data)
1280 {
1281 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1282 {
1283 mss = opts + 2;
1284 if (mss + 2 > data) return; // short?
1285 break;
1286 }
1287
1288 if (*opts == 0) return; // end of options
1289 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1290 opts++;
1291 else
1292 opts += opts[1]; // skip over option
1293 }
1294
1295 if (!mss) return; // not found
1296 orig = ntohs(*(uint16_t *) mss);
1297
1298 if (orig <= MSS) return; // mss OK
1299
1300 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1301 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1302 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1303 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1304
1305 // set mss
1306 *(int16_t *) mss = htons(MSS);
1307
1308 // adjust checksum (see rfc1141)
1309 sum = orig + (~MSS & 0xffff);
1310 sum += ntohs(*(uint16_t *) (tcp + 16));
1311 sum = (sum & 0xffff) + (sum >> 16);
1312 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1313 }
1314
1315 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1316 {
1317 uint16_t proto;
1318 if (extra) {
1319 // Skip the four extra bytes
1320 p += 4;
1321 l -= 4;
1322 }
1323
1324 if (*p & 1)
1325 {
1326 proto = *p++;
1327 l--;
1328 }
1329 else
1330 {
1331 proto = ntohs(*(uint16_t *) p);
1332 p += 2;
1333 l -= 2;
1334 }
1335 if (proto == PPPIP)
1336 {
1337 if (session[s].die)
1338 {
1339 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1340 return; // closing session, PPP not processed
1341 }
1342 session[s].last_packet = session[s].last_data = time_now;
1343 processipin(s, t, p, l);
1344 }
1345 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1346 {
1347 if (session[s].die)
1348 {
1349 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1350 return; // closing session, PPP not processed
1351 }
1352
1353 session[s].last_packet = session[s].last_data = time_now;
1354 processipv6in(s, t, p, l);
1355 }
1356 else if (proto == PPPIPCP)
1357 {
1358 session[s].last_packet = session[s].last_data = time_now;
1359 processipcp(s, t, p, l);
1360 }
1361 else if (proto == PPPCCP)
1362 {
1363 session[s].last_packet = session[s].last_data = time_now;
1364 processccp(s, t, p, l);
1365 }
1366 else
1367 {
1368 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1369 }
1370 }
1371
1372 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1373 {
1374 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1375 sp->cout_delta += len;
1376 sp->pout++;
1377 sp->last_data = time_now;
1378
1379 sess_local[s].cout += len; // To send to master..
1380 sess_local[s].pout++;
1381 }
1382
1383 // process outgoing (to tunnel) IP
1384 //
1385 // (i.e. this routine writes to data[-8]).
1386 void processipout(uint8_t *buf, int len)
1387 {
1388 sessionidt s;
1389 sessiont *sp;
1390 tunnelidt t;
1391 in_addr_t ip;
1392
1393 uint8_t *data = buf; // Keep a copy of the originals.
1394 int size = len;
1395
1396 uint8_t fragbuf[MAXETHER + 20];
1397
1398 CSTAT(processipout);
1399
1400 if (len < MIN_IP_SIZE)
1401 {
1402 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1403 STAT(tun_rx_errors);
1404 return;
1405 }
1406 if (len >= MAXETHER)
1407 {
1408 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1409 STAT(tun_rx_errors);
1410 return;
1411 }
1412
1413 // Skip the tun header
1414 buf += 4;
1415 len -= 4;
1416
1417 // Got an IP header now
1418 if (*(uint8_t *)(buf) >> 4 != 4)
1419 {
1420 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1421 return;
1422 }
1423
1424 ip = *(uint32_t *)(buf + 16);
1425 if (!(s = sessionbyip(ip)))
1426 {
1427 // Is this a packet for a session that doesn't exist?
1428 static int rate = 0; // Number of ICMP packets we've sent this second.
1429 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1430
1431 if (last != time_now)
1432 {
1433 last = time_now;
1434 rate = 0;
1435 }
1436
1437 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1438 {
1439 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1440 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1441 config->bind_address ? config->bind_address : my_address, buf, len);
1442 }
1443 return;
1444 }
1445
1446 t = session[s].tunnel;
1447 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1448 {
1449 LOG(3, s, t, "Packet size more than session MRU\n");
1450 return;
1451 }
1452
1453 sp = &session[s];
1454
1455 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1456 if (config->max_packets > 0)
1457 {
1458 if (sess_local[s].last_packet_out == TIME)
1459 {
1460 int max = config->max_packets;
1461
1462 // All packets for throttled sessions are handled by the
1463 // master, so further limit by using the throttle rate.
1464 // A bit of a kludge, since throttle rate is in kbps,
1465 // but should still be generous given our average DSL
1466 // packet size is 200 bytes: a limit of 28kbps equates
1467 // to around 180 packets per second.
1468 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1469 max = sp->throttle_out;
1470
1471 if (++sess_local[s].packets_out > max)
1472 {
1473 sess_local[s].packets_dropped++;
1474 return;
1475 }
1476 }
1477 else
1478 {
1479 if (sess_local[s].packets_dropped)
1480 {
1481 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1482 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1483 sess_local[s].packets_dropped, sess_local[s].packets_out,
1484 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1485 sp->user);
1486 }
1487
1488 sess_local[s].last_packet_out = TIME;
1489 sess_local[s].packets_out = 1;
1490 sess_local[s].packets_dropped = 0;
1491 }
1492 }
1493
1494 // run access-list if any
1495 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1496 return;
1497
1498 // adjust MSS on SYN and SYN,ACK packets with options
1499 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1500 {
1501 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1502 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1503 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1504 }
1505
1506 if (sp->tbf_out)
1507 {
1508 // Are we throttling this session?
1509 if (config->cluster_iam_master)
1510 tbf_queue_packet(sp->tbf_out, data, size);
1511 else
1512 master_throttle_packet(sp->tbf_out, data, size);
1513 return;
1514 }
1515
1516 if (sp->walled_garden && !config->cluster_iam_master)
1517 {
1518 // We are walled-gardening this
1519 master_garden_packet(s, data, size);
1520 return;
1521 }
1522
1523 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1524 {
1525
1526 if (!config->cluster_iam_master)
1527 {
1528 // The MPPP packets must be managed by the Master.
1529 master_forward_mppp_packet(s, data, size);
1530 return;
1531 }
1532
1533 // Add on L2TP header
1534 sessionidt members[MAXBUNDLESES];
1535 bundleidt bid = session[s].bundle;
1536 bundlet *b = &bundle[bid];
1537 uint32_t num_of_links, nb_opened;
1538 int i;
1539
1540 num_of_links = b->num_of_links;
1541 nb_opened = 0;
1542 for (i = 0;i < num_of_links;i++)
1543 {
1544 s = b->members[i];
1545 if (session[s].ppp.lcp == Opened)
1546 {
1547 members[nb_opened] = s;
1548 nb_opened++;
1549 }
1550 }
1551
1552 if (nb_opened < 1)
1553 {
1554 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1555 return;
1556 }
1557
1558 num_of_links = nb_opened;
1559 b->current_ses = (b->current_ses + 1) % num_of_links;
1560 s = members[b->current_ses];
1561 t = session[s].tunnel;
1562 sp = &session[s];
1563 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1564
1565 if (num_of_links > 1)
1566 {
1567 if(len > MINFRAGLEN)
1568 {
1569 //for rotate traffic among the member links
1570 uint32_t divisor = num_of_links;
1571 if (divisor > 2)
1572 divisor = divisor/2 + (divisor & 1);
1573
1574 // Partition the packet to "num_of_links" fragments
1575 uint32_t fraglen = len / divisor;
1576 uint32_t last_fraglen = fraglen + len % divisor;
1577 uint32_t remain = len;
1578
1579 // send the first packet
1580 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1581 if (!p) return;
1582 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1583
1584 // statistics
1585 update_session_out_stat(s, sp, fraglen);
1586
1587 remain -= fraglen;
1588 while (remain > last_fraglen)
1589 {
1590 b->current_ses = (b->current_ses + 1) % num_of_links;
1591 s = members[b->current_ses];
1592 t = session[s].tunnel;
1593 sp = &session[s];
1594 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1595 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1596 if (!p) return;
1597 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1598 update_session_out_stat(s, sp, fraglen);
1599 remain -= fraglen;
1600 }
1601 // send the last fragment
1602 b->current_ses = (b->current_ses + 1) % num_of_links;
1603 s = members[b->current_ses];
1604 t = session[s].tunnel;
1605 sp = &session[s];
1606 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1607 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1608 if (!p) return;
1609 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1610 update_session_out_stat(s, sp, remain);
1611 if (remain != last_fraglen)
1612 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1613 }
1614 else
1615 {
1616 // Send it as one frame
1617 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1618 if (!p) return;
1619 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1620 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1621 update_session_out_stat(s, sp, len);
1622 }
1623 }
1624 else
1625 {
1626 // Send it as one frame (NO MPPP Frame)
1627 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1628 if (!p) return;
1629 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1630 update_session_out_stat(s, sp, len);
1631 }
1632 }
1633 else
1634 {
1635 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1636 if (!p) return;
1637 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1638 update_session_out_stat(s, sp, len);
1639 }
1640
1641 // Snooping this session, send it to intercept box
1642 if (sp->snoop_ip && sp->snoop_port)
1643 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1644
1645 udp_tx += len;
1646 }
1647
1648 // process outgoing (to tunnel) IPv6
1649 //
1650 static void processipv6out(uint8_t * buf, int len)
1651 {
1652 sessionidt s;
1653 sessiont *sp;
1654 tunnelidt t;
1655 in_addr_t ip;
1656 struct in6_addr ip6;
1657
1658 uint8_t *data = buf; // Keep a copy of the originals.
1659 int size = len;
1660
1661 uint8_t b[MAXETHER + 20];
1662
1663 CSTAT(processipv6out);
1664
1665 if (len < MIN_IP_SIZE)
1666 {
1667 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1668 STAT(tunnel_tx_errors);
1669 return;
1670 }
1671 if (len >= MAXETHER)
1672 {
1673 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1674 STAT(tunnel_tx_errors);
1675 return;
1676 }
1677
1678 // Skip the tun header
1679 buf += 4;
1680 len -= 4;
1681
1682 // Got an IP header now
1683 if (*(uint8_t *)(buf) >> 4 != 6)
1684 {
1685 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1686 return;
1687 }
1688
1689 ip6 = *(struct in6_addr *)(buf+24);
1690 s = sessionbyipv6(ip6);
1691
1692 if (s == 0)
1693 {
1694 ip = *(uint32_t *)(buf + 32);
1695 s = sessionbyip(ip);
1696 }
1697
1698 if (s == 0)
1699 {
1700 // Is this a packet for a session that doesn't exist?
1701 static int rate = 0; // Number of ICMP packets we've sent this second.
1702 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1703
1704 if (last != time_now)
1705 {
1706 last = time_now;
1707 rate = 0;
1708 }
1709
1710 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1711 {
1712 // FIXME: Should send icmp6 host unreachable
1713 }
1714 return;
1715 }
1716 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1717 {
1718 bundleidt bid = session[s].bundle;
1719 bundlet *b = &bundle[bid];
1720
1721 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1722 s = b->members[b->current_ses];
1723 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1724 }
1725 t = session[s].tunnel;
1726 sp = &session[s];
1727 sp->last_data = time_now;
1728
1729 // FIXME: add DoS prevention/filters?
1730
1731 if (sp->tbf_out)
1732 {
1733 // Are we throttling this session?
1734 if (config->cluster_iam_master)
1735 tbf_queue_packet(sp->tbf_out, data, size);
1736 else
1737 master_throttle_packet(sp->tbf_out, data, size);
1738 return;
1739 }
1740 else if (sp->walled_garden && !config->cluster_iam_master)
1741 {
1742 // We are walled-gardening this
1743 master_garden_packet(s, data, size);
1744 return;
1745 }
1746
1747 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1748
1749 // Add on L2TP header
1750 {
1751 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1752 if (!p) return;
1753 tunnelsend(b, len + (p-b), t); // send it...
1754 }
1755
1756 // Snooping this session, send it to intercept box
1757 if (sp->snoop_ip && sp->snoop_port)
1758 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1759
1760 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1761 sp->cout_delta += len;
1762 sp->pout++;
1763 udp_tx += len;
1764
1765 sess_local[s].cout += len; // To send to master..
1766 sess_local[s].pout++;
1767 }
1768
1769 //
1770 // Helper routine for the TBF filters.
1771 // Used to send queued data in to the user!
1772 //
1773 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1774 {
1775 sessiont *sp;
1776 tunnelidt t;
1777
1778 uint8_t b[MAXETHER + 20];
1779
1780 if (len < 0 || len > MAXETHER)
1781 {
1782 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1783 return;
1784 }
1785
1786 // Skip the tun header
1787 buf += 4;
1788 len -= 4;
1789
1790 if (!session[s].ip)
1791 return;
1792
1793 t = session[s].tunnel;
1794 sp = &session[s];
1795
1796 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1797
1798 // Add on L2TP header
1799 {
1800 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1801 if (!p) return;
1802 tunnelsend(b, len + (p-b), t); // send it...
1803 }
1804
1805 // Snooping this session.
1806 if (sp->snoop_ip && sp->snoop_port)
1807 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1808
1809 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1810 sp->cout_delta += len;
1811 sp->pout++;
1812 udp_tx += len;
1813
1814 sess_local[s].cout += len; // To send to master..
1815 sess_local[s].pout++;
1816 }
1817
1818 // add an AVP (16 bit)
1819 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1820 {
1821 uint16_t l = (m ? 0x8008 : 0x0008);
1822 c->buf16[c->length/2 + 0] = htons(l);
1823 c->buf16[c->length/2 + 1] = htons(0);
1824 c->buf16[c->length/2 + 2] = htons(avp);
1825 c->buf16[c->length/2 + 3] = htons(val);
1826 c->length += 8;
1827 }
1828
1829 // add an AVP (32 bit)
1830 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1831 {
1832 uint16_t l = (m ? 0x800A : 0x000A);
1833 c->buf16[c->length/2 + 0] = htons(l);
1834 c->buf16[c->length/2 + 1] = htons(0);
1835 c->buf16[c->length/2 + 2] = htons(avp);
1836 *(uint32_t *) &c->buf[c->length + 6] = htonl(val);
1837 c->length += 10;
1838 }
1839
1840 // add an AVP (string)
1841 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1842 {
1843 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1844 c->buf16[c->length/2 + 0] = htons(l);
1845 c->buf16[c->length/2 + 1] = htons(0);
1846 c->buf16[c->length/2 + 2] = htons(avp);
1847 memcpy(&c->buf[c->length + 6], val, strlen(val));
1848 c->length += 6 + strlen(val);
1849 }
1850
1851 // add a binary AVP
1852 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1853 {
1854 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1855 c->buf16[c->length/2 + 0] = htons(l);
1856 c->buf16[c->length/2 + 1] = htons(0);
1857 c->buf16[c->length/2 + 2] = htons(avp);
1858 memcpy(&c->buf[c->length + 6], val, len);
1859 c->length += 6 + len;
1860 }
1861
1862 // new control connection
1863 static controlt *controlnew(uint16_t mtype)
1864 {
1865 controlt *c;
1866 if (!controlfree)
1867 c = malloc(sizeof(controlt));
1868 else
1869 {
1870 c = controlfree;
1871 controlfree = c->next;
1872 }
1873 assert(c);
1874 c->next = 0;
1875 c->buf16[0] = htons(0xC802); // flags/ver
1876 c->length = 12;
1877 control16(c, 0, mtype, 1);
1878 return c;
1879 }
1880
1881 // send zero block if nothing is waiting
1882 // (ZLB send).
1883 static void controlnull(tunnelidt t)
1884 {
1885 uint16_t buf[6];
1886 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1887 return;
1888
1889 buf[0] = htons(0xC802); // flags/ver
1890 buf[1] = htons(12); // length
1891 buf[2] = htons(tunnel[t].far); // tunnel
1892 buf[3] = htons(0); // session
1893 buf[4] = htons(tunnel[t].ns); // sequence
1894 buf[5] = htons(tunnel[t].nr); // sequence
1895 tunnelsend((uint8_t *)buf, 12, t);
1896 }
1897
1898 // add a control message to a tunnel, and send if within window
1899 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1900 {
1901 c->buf16[1] = htons(c->length); // length
1902 c->buf16[2] = htons(tunnel[t].far); // tunnel
1903 c->buf16[3] = htons(far); // session
1904 c->buf16[4] = htons(tunnel[t].ns); // sequence
1905 tunnel[t].ns++; // advance sequence
1906 // link in message in to queue
1907 if (tunnel[t].controlc)
1908 tunnel[t].controle->next = c;
1909 else
1910 tunnel[t].controls = c;
1911
1912 tunnel[t].controle = c;
1913 tunnel[t].controlc++;
1914
1915 // send now if space in window
1916 if (tunnel[t].controlc <= tunnel[t].window)
1917 {
1918 tunnel[t].try = 0; // first send
1919 tunnelsend(c->buf, c->length, t);
1920 }
1921 }
1922
1923 //
1924 // Throttle or Unthrottle a session
1925 //
1926 // Throttle the data from/to through a session to no more than
1927 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1928 // user).
1929 //
1930 // If either value is -1, the current value is retained for that
1931 // direction.
1932 //
1933 void throttle_session(sessionidt s, int rate_in, int rate_out)
1934 {
1935 if (!session[s].opened)
1936 return; // No-one home.
1937
1938 if (!*session[s].user)
1939 return; // User not logged in
1940
1941 if (rate_in >= 0)
1942 {
1943 int bytes = rate_in * 1024 / 8; // kbits to bytes
1944 if (session[s].tbf_in)
1945 free_tbf(session[s].tbf_in);
1946
1947 if (rate_in > 0)
1948 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1949 else
1950 session[s].tbf_in = 0;
1951
1952 session[s].throttle_in = rate_in;
1953 }
1954
1955 if (rate_out >= 0)
1956 {
1957 int bytes = rate_out * 1024 / 8;
1958 if (session[s].tbf_out)
1959 free_tbf(session[s].tbf_out);
1960
1961 if (rate_out > 0)
1962 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1963 else
1964 session[s].tbf_out = 0;
1965
1966 session[s].throttle_out = rate_out;
1967 }
1968 }
1969
1970 // add/remove filters from session (-1 = no change)
1971 void filter_session(sessionidt s, int filter_in, int filter_out)
1972 {
1973 if (!session[s].opened)
1974 return; // No-one home.
1975
1976 if (!*session[s].user)
1977 return; // User not logged in
1978
1979 // paranoia
1980 if (filter_in > MAXFILTER) filter_in = -1;
1981 if (filter_out > MAXFILTER) filter_out = -1;
1982 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1983 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1984
1985 if (filter_in >= 0)
1986 {
1987 if (session[s].filter_in)
1988 ip_filters[session[s].filter_in - 1].used--;
1989
1990 if (filter_in > 0)
1991 ip_filters[filter_in - 1].used++;
1992
1993 session[s].filter_in = filter_in;
1994 }
1995
1996 if (filter_out >= 0)
1997 {
1998 if (session[s].filter_out)
1999 ip_filters[session[s].filter_out - 1].used--;
2000
2001 if (filter_out > 0)
2002 ip_filters[filter_out - 1].used++;
2003
2004 session[s].filter_out = filter_out;
2005 }
2006 }
2007
2008 // start tidy shutdown of session
2009 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
2010 {
2011 int walled_garden = session[s].walled_garden;
2012 bundleidt b = session[s].bundle;
2013 //delete routes only for last session in bundle (in case of MPPP)
2014 int del_routes = !b || (bundle[b].num_of_links == 1);
2015
2016 CSTAT(sessionshutdown);
2017
2018 if (!session[s].opened)
2019 {
2020 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2021 return; // not a live session
2022 }
2023
2024 if (!session[s].die)
2025 {
2026 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2027 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2028 run_plugins(PLUGIN_KILL_SESSION, &data);
2029 }
2030
2031 if (session[s].ip && !walled_garden && !session[s].die)
2032 {
2033 // RADIUS Stop message
2034 uint16_t r = radiusnew(s);
2035 if (r)
2036 {
2037 // stop, if not already trying
2038 if (radius[r].state != RADIUSSTOP)
2039 {
2040 radius[r].term_cause = term_cause;
2041 radius[r].term_msg = reason;
2042 radiussend(r, RADIUSSTOP);
2043 }
2044 }
2045 else
2046 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2047
2048 // Save counters to dump to accounting file
2049 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2050 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2051 }
2052
2053 if (!session[s].die)
2054 session[s].die = TIME + 150; // Clean up in 15 seconds
2055
2056 if (session[s].ip)
2057 { // IP allocated, clear and unroute
2058 int r;
2059 int routed = 0;
2060 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2061 {
2062 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2063 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2064 routed++;
2065
2066 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2067 session[s].route[r].ip = 0;
2068 }
2069
2070 if (session[s].ip_pool_index == -1) // static ip
2071 {
2072 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2073 session[s].ip = 0;
2074 }
2075 else
2076 free_ip_address(s);
2077
2078 // unroute IPv6, if setup
2079 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2080 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2081
2082 if (b)
2083 {
2084 // This session was part of a bundle
2085 bundle[b].num_of_links--;
2086 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2087 if(bundle[b].num_of_links == 0)
2088 {
2089 bundleclear(b);
2090 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2091 }
2092 else
2093 {
2094 // Adjust the members array to accomodate the new change
2095 uint8_t mem_num = 0;
2096 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2097 if(bundle[b].members[bundle[b].num_of_links] != s)
2098 {
2099 uint8_t ml;
2100 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2101 if(bundle[b].members[ml] == s)
2102 {
2103 mem_num = ml;
2104 break;
2105 }
2106 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2107 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2108
2109 // If the killed session is the first of the bundle,
2110 // the new first session must be stored in the cache_ipmap
2111 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2112 if (mem_num == 0)
2113 {
2114 sessionidt new_s = bundle[b].members[0];
2115
2116 routed = 0;
2117 // Add the route for this session.
2118 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2119 {
2120 int i, prefixlen;
2121 in_addr_t ip;
2122
2123 prefixlen = session[new_s].route[r].prefixlen;
2124 ip = session[new_s].route[r].ip;
2125
2126 if (!prefixlen) prefixlen = 32;
2127 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2128
2129 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2130 cache_ipmap(i, new_s);
2131 }
2132 cache_ipmap(session[new_s].ip, new_s);
2133
2134 // IPV6 route
2135 if (session[new_s].ipv6prefixlen)
2136 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2137 }
2138 }
2139 }
2140
2141 cluster_send_bundle(b);
2142 }
2143 }
2144
2145 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2146 throttle_session(s, 0, 0);
2147
2148 if (cdn_result)
2149 {
2150 if (session[s].tunnel == TUNNEL_ID_PPPOE)
2151 {
2152 pppoe_shutdown_session(s);
2153 }
2154 else
2155 {
2156 // Send CDN
2157 controlt *c = controlnew(14); // sending CDN
2158 if (cdn_error)
2159 {
2160 uint16_t buf[2];
2161 buf[0] = htons(cdn_result);
2162 buf[1] = htons(cdn_error);
2163 controlb(c, 1, (uint8_t *)buf, 4, 1);
2164 }
2165 else
2166 control16(c, 1, cdn_result, 1);
2167
2168 control16(c, 14, s, 1); // assigned session (our end)
2169 controladd(c, session[s].far, session[s].tunnel); // send the message
2170 }
2171 }
2172
2173 // update filter refcounts
2174 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2175 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2176
2177 // clear PPP state
2178 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2179 sess_local[s].lcp.restart = 0;
2180 sess_local[s].ipcp.restart = 0;
2181 sess_local[s].ipv6cp.restart = 0;
2182 sess_local[s].ccp.restart = 0;
2183
2184 cluster_send_session(s);
2185 }
2186
2187 void sendipcp(sessionidt s, tunnelidt t)
2188 {
2189 uint8_t buf[MAXETHER];
2190 uint8_t *q;
2191
2192 CSTAT(sendipcp);
2193 LOG(3, s, t, "IPCP: send ConfigReq\n");
2194
2195 if (!session[s].unique_id)
2196 {
2197 if (!++last_id) ++last_id; // skip zero
2198 session[s].unique_id = last_id;
2199 }
2200
2201 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2202 if (!q) return;
2203
2204 *q = ConfigReq;
2205 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2206 *(uint16_t *) (q + 2) = htons(10); // packet length
2207 q[4] = 3; // ip address option
2208 q[5] = 6; // option length
2209 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2210 config->iftun_address ? config->iftun_address :
2211 my_address; // send my IP
2212
2213 tunnelsend(buf, 10 + (q - buf), t); // send it
2214 restart_timer(s, ipcp);
2215 }
2216
2217 void sendipv6cp(sessionidt s, tunnelidt t)
2218 {
2219 uint8_t buf[MAXETHER];
2220 uint8_t *q;
2221
2222 CSTAT(sendipv6cp);
2223 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2224
2225 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2226 if (!q) return;
2227
2228 *q = ConfigReq;
2229 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2230 // only send one type
2231 // of request
2232 *(uint16_t *) (q + 2) = htons(14);
2233 q[4] = 1; // interface identifier option
2234 q[5] = 10; // option length
2235 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2236 *(uint32_t *) (q + 10) = 0;
2237 q[13] = 1;
2238
2239 tunnelsend(buf, 14 + (q - buf), t); // send it
2240 restart_timer(s, ipv6cp);
2241 }
2242
2243 static void sessionclear(sessionidt s)
2244 {
2245 memset(&session[s], 0, sizeof(session[s]));
2246 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2247 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2248
2249 session[s].tunnel = T_FREE; // Mark it as free.
2250 session[s].next = sessionfree;
2251 sessionfree = s;
2252 }
2253
2254 // kill a session now
2255 void sessionkill(sessionidt s, char *reason)
2256 {
2257 CSTAT(sessionkill);
2258
2259 if (!session[s].opened) // not alive
2260 return;
2261
2262 if (session[s].next)
2263 {
2264 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2265 return;
2266 }
2267
2268 if (!session[s].die)
2269 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2270
2271 if (sess_local[s].radius)
2272 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2273
2274 #ifdef LAC
2275 if (session[s].forwardtosession)
2276 {
2277 sessionidt sess = session[s].forwardtosession;
2278 if (session[sess].forwardtosession == s)
2279 {
2280 // Shutdown the linked session also.
2281 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2282 }
2283 }
2284 #endif
2285
2286 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2287 sessionclear(s);
2288 cluster_send_session(s);
2289 }
2290
2291 static void tunnelclear(tunnelidt t)
2292 {
2293 if (!t) return;
2294 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2295 tunnel[t].state = TUNNELFREE;
2296 }
2297
2298 static void bundleclear(bundleidt b)
2299 {
2300 if (!b) return;
2301 memset(&bundle[b], 0, sizeof(bundle[b]));
2302 bundle[b].state = BUNDLEFREE;
2303 }
2304
2305 // kill a tunnel now
2306 static void tunnelkill(tunnelidt t, char *reason)
2307 {
2308 sessionidt s;
2309 controlt *c;
2310
2311 CSTAT(tunnelkill);
2312
2313 tunnel[t].state = TUNNELDIE;
2314
2315 // free control messages
2316 while ((c = tunnel[t].controls))
2317 {
2318 controlt * n = c->next;
2319 tunnel[t].controls = n;
2320 tunnel[t].controlc--;
2321 c->next = controlfree;
2322 controlfree = c;
2323 }
2324 // kill sessions
2325 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2326 if (session[s].tunnel == t)
2327 sessionkill(s, reason);
2328
2329 // free tunnel
2330 tunnelclear(t);
2331 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2332 cli_tunnel_actions[t].action = 0;
2333 cluster_send_tunnel(t);
2334 }
2335
2336 // shut down a tunnel cleanly
2337 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2338 {
2339 sessionidt s;
2340
2341 CSTAT(tunnelshutdown);
2342
2343 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2344 {
2345 // never set up, can immediately kill
2346 tunnelkill(t, reason);
2347 return;
2348 }
2349 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2350
2351 // close session
2352 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2353 if (session[s].tunnel == t)
2354 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2355
2356 tunnel[t].state = TUNNELDIE;
2357 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2358 cluster_send_tunnel(t);
2359 // TBA - should we wait for sessions to stop?
2360 if (result)
2361 {
2362 controlt *c = controlnew(4); // sending StopCCN
2363 if (error)
2364 {
2365 uint16_t buf[32];
2366 int l = 4;
2367 buf[0] = htons(result);
2368 buf[1] = htons(error);
2369 if (msg)
2370 {
2371 int m = strlen(msg);
2372 if (m + 4 > sizeof(buf))
2373 m = sizeof(buf) - 4;
2374
2375 memcpy(buf+2, msg, m);
2376 l += m;
2377 }
2378
2379 controlb(c, 1, (uint8_t *)buf, l, 1);
2380 }
2381 else
2382 control16(c, 1, result, 1);
2383
2384 control16(c, 9, t, 1); // assigned tunnel (our end)
2385 controladd(c, 0, t); // send the message
2386 }
2387 }
2388
2389 // read and process packet on tunnel (UDP)
2390 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2391 {
2392 uint8_t *chapresponse = NULL;
2393 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2394 uint8_t *p = buf + 2;
2395
2396
2397 CSTAT(processudp);
2398
2399 udp_rx += len;
2400 udp_rx_pkt++;
2401 LOG_HEX(5, "UDP Data", buf, len);
2402 STAT(tunnel_rx_packets);
2403 INC_STAT(tunnel_rx_bytes, len);
2404 if (len < 6)
2405 {
2406 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2407 STAT(tunnel_rx_errors);
2408 return;
2409 }
2410 if ((buf[1] & 0x0F) != 2)
2411 {
2412 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2413 STAT(tunnel_rx_errors);
2414 return;
2415 }
2416 if (*buf & 0x40)
2417 { // length
2418 l = ntohs(*(uint16_t *) p);
2419 p += 2;
2420 }
2421 t = ntohs(*(uint16_t *) p);
2422 p += 2;
2423 s = ntohs(*(uint16_t *) p);
2424 p += 2;
2425 if (s >= MAXSESSION)
2426 {
2427 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2428 STAT(tunnel_rx_errors);
2429 return;
2430 }
2431 if (t >= MAXTUNNEL)
2432 {
2433 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2434 STAT(tunnel_rx_errors);
2435 return;
2436 }
2437 if (t == TUNNEL_ID_PPPOE)
2438 {
2439 LOG(1, s, t, "Received UDP packet with tunnel ID reserved for pppoe\n");
2440 STAT(tunnel_rx_errors);
2441 return;
2442 }
2443 if (*buf & 0x08)
2444 { // ns/nr
2445 ns = ntohs(*(uint16_t *) p);
2446 p += 2;
2447 nr = ntohs(*(uint16_t *) p);
2448 p += 2;
2449 }
2450 if (*buf & 0x02)
2451 { // offset
2452 uint16_t o = ntohs(*(uint16_t *) p);
2453 p += o + 2;
2454 }
2455 if ((p - buf) > l)
2456 {
2457 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2458 STAT(tunnel_rx_errors);
2459 return;
2460 }
2461 l -= (p - buf);
2462
2463 // used to time out old tunnels
2464 if (t && tunnel[t].state == TUNNELOPEN)
2465 tunnel[t].lastrec = time_now;
2466
2467 if (*buf & 0x80)
2468 { // control
2469 uint16_t message = 0xFFFF; // message type
2470 uint8_t fatal = 0;
2471 uint8_t mandatory = 0;
2472 uint16_t asession = 0; // assigned session
2473 uint32_t amagic = 0; // magic number
2474 uint8_t aflags = 0; // flags from last LCF
2475 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2476 char called[MAXTEL] = ""; // called number
2477 char calling[MAXTEL] = ""; // calling number
2478
2479 if (!config->cluster_iam_master)
2480 {
2481 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2482 return;
2483 }
2484
2485 // control messages must have bits 0x80|0x40|0x08
2486 // (type, length and sequence) set, and bits 0x02|0x01
2487 // (offset and priority) clear
2488 if ((*buf & 0xCB) != 0xC8)
2489 {
2490 LOG(1, s, t, "Bad control header %02X\n", *buf);
2491 STAT(tunnel_rx_errors);
2492 return;
2493 }
2494
2495 // check for duplicate tunnel open message
2496 if (!t && ns == 0)
2497 {
2498 int i;
2499
2500 //
2501 // Is this a duplicate of the first packet? (SCCRQ)
2502 //
2503 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2504 {
2505 if (tunnel[i].state != TUNNELOPENING ||
2506 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2507 tunnel[i].port != ntohs(addr->sin_port) )
2508 continue;
2509 t = i;
2510 LOG(3, s, t, "Duplicate SCCRQ?\n");
2511 break;
2512 }
2513 }
2514
2515 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2516 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2517
2518 // if no tunnel specified, assign one
2519 if (!t)
2520 {
2521 if (!(t = new_tunnel()))
2522 {
2523 LOG(1, 0, 0, "No more tunnels\n");
2524 STAT(tunnel_overflow);
2525 return;
2526 }
2527 tunnelclear(t);
2528 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2529 tunnel[t].port = ntohs(addr->sin_port);
2530 tunnel[t].window = 4; // default window
2531 STAT(tunnel_created);
2532 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2533 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2534 }
2535
2536 // If the 'ns' just received is not the 'nr' we're
2537 // expecting, just send an ack and drop it.
2538 //
2539 // if 'ns' is less, then we got a retransmitted packet.
2540 // if 'ns' is greater than missed a packet. Either way
2541 // we should ignore it.
2542 if (ns != tunnel[t].nr)
2543 {
2544 // is this the sequence we were expecting?
2545 STAT(tunnel_rx_errors);
2546 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2547 t, ns, tunnel[t].nr);
2548
2549 if (l) // Is this not a ZLB?
2550 controlnull(t);
2551 return;
2552 }
2553
2554 // check sequence of this message
2555 {
2556 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2557 // some to clear maybe?
2558 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2559 {
2560 controlt *c = tunnel[t].controls;
2561 tunnel[t].controls = c->next;
2562 tunnel[t].controlc--;
2563 c->next = controlfree;
2564 controlfree = c;
2565 skip--;
2566 tunnel[t].try = 0; // we have progress
2567 }
2568
2569 // receiver advance (do here so quoted correctly in any sends below)
2570 if (l) tunnel[t].nr = (ns + 1);
2571 if (skip < 0) skip = 0;
2572 if (skip < tunnel[t].controlc)
2573 {
2574 // some control packets can now be sent that were previous stuck out of window
2575 int tosend = tunnel[t].window - skip;
2576 controlt *c = tunnel[t].controls;
2577 while (c && skip)
2578 {
2579 c = c->next;
2580 skip--;
2581 }
2582 while (c && tosend)
2583 {
2584 tunnel[t].try = 0; // first send
2585 tunnelsend(c->buf, c->length, t);
2586 c = c->next;
2587 tosend--;
2588 }
2589 }
2590 if (!tunnel[t].controlc)
2591 tunnel[t].retry = 0; // caught up
2592 }
2593 if (l)
2594 { // if not a null message
2595 int result = 0;
2596 int error = 0;
2597 char *msg = 0;
2598
2599 // Default disconnect cause/message on receipt of CDN. Set to
2600 // more specific value from attribute 1 (result code) or 46
2601 // (disconnect cause) if present below.
2602 int disc_cause_set = 0;
2603 int disc_cause = TERM_NAS_REQUEST;
2604 char const *disc_reason = "Closed (Received CDN).";
2605
2606 // process AVPs
2607 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2608 {
2609 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2610 uint8_t *b = p;
2611 uint8_t flags = *p;
2612 uint16_t mtype;
2613
2614 if (n > l)
2615 {
2616 LOG(1, s, t, "Invalid length in AVP\n");
2617 STAT(tunnel_rx_errors);
2618 return;
2619 }
2620 p += n; // next
2621 l -= n;
2622 if (flags & 0x3C) // reserved bits, should be clear
2623 {
2624 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2625 fatal = flags;
2626 result = 2; // general error
2627 error = 3; // reserved field non-zero
2628 msg = 0;
2629 continue; // next
2630 }
2631 b += 2;
2632 if (*(uint16_t *) (b))
2633 {
2634 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2635 fatal = flags;
2636 result = 2; // general error
2637 error = 6; // generic vendor-specific error
2638 msg = "unsupported vendor-specific";
2639 continue; // next
2640 }
2641 b += 2;
2642 mtype = ntohs(*(uint16_t *) (b));
2643 b += 2;
2644 n -= 6;
2645
2646 if (flags & 0x40)
2647 {
2648 uint16_t orig_len;
2649
2650 // handle hidden AVPs
2651 if (!*config->l2tp_secret)
2652 {
2653 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2654 fatal = flags;
2655 result = 2; // general error
2656 error = 6; // generic vendor-specific error
2657 msg = "secret not specified";
2658 continue;
2659 }
2660 if (!session[s].random_vector_length)
2661 {
2662 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2663 fatal = flags;
2664 result = 2; // general error
2665 error = 6; // generic
2666 msg = "no random vector";
2667 continue;
2668 }
2669 if (n < 8)
2670 {
2671 LOG(2, s, t, "Short hidden AVP.\n");
2672 fatal = flags;
2673 result = 2; // general error
2674 error = 2; // length is wrong
2675 msg = 0;
2676 continue;
2677 }
2678
2679 // Unhide the AVP
2680 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2681
2682 orig_len = ntohs(*(uint16_t *) b);
2683 if (orig_len > n + 2)
2684 {
2685 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2686 orig_len, n);
2687
2688 fatal = flags;
2689 result = 2; // general error
2690 error = 2; // length is wrong
2691 msg = 0;
2692 continue;
2693 }
2694
2695 b += 2;
2696 n = orig_len;
2697 }
2698
2699 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2700 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2701
2702 switch (mtype)
2703 {
2704 case 0: // message type
2705 message = ntohs(*(uint16_t *) b);
2706 mandatory = flags & 0x80;
2707 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2708 break;
2709 case 1: // result code
2710 {
2711 uint16_t rescode = ntohs(*(uint16_t *) b);
2712 char const *resdesc = "(unknown)";
2713 char const *errdesc = NULL;
2714 int cause = 0;
2715
2716 if (message == 4)
2717 { /* StopCCN */
2718 resdesc = l2tp_stopccn_result_code(rescode);
2719 cause = TERM_LOST_SERVICE;
2720 }
2721 else if (message == 14)
2722 { /* CDN */
2723 resdesc = l2tp_cdn_result_code(rescode);
2724 if (rescode == 1)
2725 cause = TERM_LOST_CARRIER;
2726 else
2727 cause = TERM_ADMIN_RESET;
2728 }
2729
2730 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2731 if (n >= 4)
2732 {
2733 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2734 errdesc = l2tp_error_code(errcode);
2735 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2736 }
2737 if (n > 4)
2738 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2739
2740 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2741 {
2742 disc_cause_set = mtype;
2743 disc_reason = errdesc ? errdesc : resdesc;
2744 disc_cause = cause;
2745 }
2746
2747 break;
2748 }
2749 break;
2750 case 2: // protocol version
2751 {
2752 version = ntohs(*(uint16_t *) (b));
2753 LOG(4, s, t, " Protocol version = %u\n", version);
2754 if (version && version != 0x0100)
2755 { // allow 0.0 and 1.0
2756 LOG(1, s, t, " Bad protocol version %04X\n", version);
2757 fatal = flags;
2758 result = 5; // unspported protocol version
2759 error = 0x0100; // supported version
2760 msg = 0;
2761 continue; // next
2762 }
2763 }
2764 break;
2765 case 3: // framing capabilities
2766 break;
2767 case 4: // bearer capabilities
2768 break;
2769 case 5: // tie breaker
2770 // We never open tunnels, so we don't care about tie breakers
2771 continue;
2772 case 6: // firmware revision
2773 break;
2774 case 7: // host name
2775 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2776 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2777 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2778 // TBA - to send to RADIUS
2779 break;
2780 case 8: // vendor name
2781 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2782 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2783 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2784 break;
2785 case 9: // assigned tunnel
2786 tunnel[t].far = ntohs(*(uint16_t *) (b));
2787 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2788 break;
2789 case 10: // rx window
2790 tunnel[t].window = ntohs(*(uint16_t *) (b));
2791 if (!tunnel[t].window)
2792 tunnel[t].window = 1; // window of 0 is silly
2793 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2794 break;
2795 case 11: // Challenge
2796 {
2797 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2798 build_chap_response(b, 2, n, &chapresponse);
2799 }
2800 break;
2801 case 13: // Response
2802 #ifdef LAC
2803 if (tunnel[t].isremotelns)
2804 {
2805 chapresponse = calloc(17, 1);
2806 memcpy(chapresponse, b, (n < 17) ? n : 16);
2807 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2808 }
2809 else
2810 #endif /* LAC */
2811 // Why did they send a response? We never challenge.
2812 LOG(2, s, t, " received unexpected challenge response\n");
2813 break;
2814
2815 case 14: // assigned session
2816 asession = session[s].far = ntohs(*(uint16_t *) (b));
2817 LOG(4, s, t, " assigned session = %u\n", asession);
2818 break;
2819 case 15: // call serial number
2820 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2821 break;
2822 case 18: // bearer type
2823 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2824 // TBA - for RADIUS
2825 break;
2826 case 19: // framing type
2827 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2828 // TBA
2829 break;
2830 case 21: // called number
2831 memset(called, 0, sizeof(called));
2832 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2833 LOG(4, s, t, " Called <%s>\n", called);
2834 break;
2835 case 22: // calling number
2836 memset(calling, 0, sizeof(calling));
2837 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2838 LOG(4, s, t, " Calling <%s>\n", calling);
2839 break;
2840 case 23: // subtype
2841 break;
2842 case 24: // tx connect speed
2843 if (n == 4)
2844 {
2845 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2846 }
2847 else
2848 {
2849 // AS5300s send connect speed as a string
2850 char tmp[30];
2851 memset(tmp, 0, sizeof(tmp));
2852 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2853 session[s].tx_connect_speed = atol(tmp);
2854 }
2855 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2856 break;
2857 case 38: // rx connect speed
2858 if (n == 4)
2859 {
2860 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2861 }
2862 else
2863 {
2864 // AS5300s send connect speed as a string
2865 char tmp[30];
2866 memset(tmp, 0, sizeof(tmp));
2867 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2868 session[s].rx_connect_speed = atol(tmp);
2869 }
2870 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2871 break;
2872 case 25: // Physical Channel ID
2873 {
2874 uint32_t tmp = ntohl(*(uint32_t *) b);
2875 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2876 break;
2877 }
2878 case 29: // Proxy Authentication Type
2879 {
2880 uint16_t atype = ntohs(*(uint16_t *)b);
2881 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2882 break;
2883 }
2884 case 30: // Proxy Authentication Name
2885 {
2886 char authname[64];
2887 memset(authname, 0, sizeof(authname));
2888 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2889 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2890 authname);
2891 break;
2892 }
2893 case 31: // Proxy Authentication Challenge
2894 {
2895 LOG(4, s, t, " Proxy Auth Challenge\n");
2896 break;
2897 }
2898 case 32: // Proxy Authentication ID
2899 {
2900 uint16_t authid = ntohs(*(uint16_t *)(b));
2901 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2902 break;
2903 }
2904 case 33: // Proxy Authentication Response
2905 LOG(4, s, t, " Proxy Auth Response\n");
2906 break;
2907 case 27: // last sent lcp
2908 { // find magic number
2909 uint8_t *p = b, *e = p + n;
2910 while (p + 1 < e && p[1] && p + p[1] <= e)
2911 {
2912 if (*p == 5 && p[1] == 6) // Magic-Number
2913 amagic = ntohl(*(uint32_t *) (p + 2));
2914 else if (*p == 7) // Protocol-Field-Compression
2915 aflags |= SESSION_PFC;
2916 else if (*p == 8) // Address-and-Control-Field-Compression
2917 aflags |= SESSION_ACFC;
2918 p += p[1];
2919 }
2920 }
2921 break;
2922 case 28: // last recv lcp confreq
2923 break;
2924 case 26: // Initial Received LCP CONFREQ
2925 break;
2926 case 39: // seq required - we control it as an LNS anyway...
2927 break;
2928 case 36: // Random Vector
2929 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2930 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2931 if (n > sizeof(session[s].random_vector))
2932 n = sizeof(session[s].random_vector);
2933 memcpy(session[s].random_vector, b, n);
2934 session[s].random_vector_length = n;
2935 break;
2936 case 46: // ppp disconnect cause
2937 if (n >= 5)
2938 {
2939 uint16_t code = ntohs(*(uint16_t *) b);
2940 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2941 uint8_t dir = *(b + 4);
2942
2943 LOG(4, s, t, " PPP disconnect cause "
2944 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2945 code, proto, dir, n - 5, b + 5);
2946
2947 disc_cause_set = mtype;
2948
2949 switch (code)
2950 {
2951 case 1: // admin disconnect
2952 disc_cause = TERM_ADMIN_RESET;
2953 disc_reason = "Administrative disconnect";
2954 break;
2955 case 3: // lcp terminate
2956 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2957 disc_cause = TERM_USER_REQUEST;
2958 disc_reason = "Normal disconnection";
2959 break;
2960 case 4: // compulsory encryption unavailable
2961 if (dir != 1) break; // 1=refused by peer, 2=local
2962 disc_cause = TERM_USER_ERROR;
2963 disc_reason = "Compulsory encryption refused";
2964 break;
2965 case 5: // lcp: fsm timeout
2966 disc_cause = TERM_PORT_ERROR;
2967 disc_reason = "LCP: FSM timeout";
2968 break;
2969 case 6: // lcp: no recognisable lcp packets received
2970 disc_cause = TERM_PORT_ERROR;
2971 disc_reason = "LCP: no recognisable LCP packets";
2972 break;
2973 case 7: // lcp: magic-no error (possibly looped back)
2974 disc_cause = TERM_PORT_ERROR;
2975 disc_reason = "LCP: magic-no error (possible loop)";
2976 break;
2977 case 8: // lcp: echo request timeout
2978 disc_cause = TERM_PORT_ERROR;
2979 disc_reason = "LCP: echo request timeout";
2980 break;
2981 case 13: // auth: fsm timeout
2982 disc_cause = TERM_SERVICE_UNAVAILABLE;
2983 disc_reason = "Authentication: FSM timeout";
2984 break;
2985 case 15: // auth: unacceptable auth protocol
2986 disc_cause = TERM_SERVICE_UNAVAILABLE;
2987 disc_reason = "Unacceptable authentication protocol";
2988 break;
2989 case 16: // auth: authentication failed
2990 disc_cause = TERM_SERVICE_UNAVAILABLE;
2991 disc_reason = "Authentication failed";
2992 break;
2993 case 17: // ncp: fsm timeout
2994 disc_cause = TERM_SERVICE_UNAVAILABLE;
2995 disc_reason = "NCP: FSM timeout";
2996 break;
2997 case 18: // ncp: no ncps available
2998 disc_cause = TERM_SERVICE_UNAVAILABLE;
2999 disc_reason = "NCP: no NCPs available";
3000 break;
3001 case 19: // ncp: failure to converge on acceptable address
3002 disc_cause = TERM_SERVICE_UNAVAILABLE;
3003 disc_reason = (dir == 1)
3004 ? "NCP: too many Configure-Naks received from peer"
3005 : "NCP: too many Configure-Naks sent to peer";
3006 break;
3007 case 20: // ncp: user not permitted to use any address
3008 disc_cause = TERM_SERVICE_UNAVAILABLE;
3009 disc_reason = (dir == 1)
3010 ? "NCP: local link address not acceptable to peer"
3011 : "NCP: remote link address not acceptable";
3012 break;
3013 }
3014 }
3015 break;
3016 default:
3017 {
3018 static char e[] = "unknown AVP 0xXXXX";
3019 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
3020 fatal = flags;
3021 result = 2; // general error
3022 error = 8; // unknown mandatory AVP
3023 sprintf((msg = e) + 14, "%04x", mtype);
3024 continue; // next
3025 }
3026 }
3027 }
3028 // process message
3029 if (fatal & 0x80)
3030 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
3031 else
3032 switch (message)
3033 {
3034 case 1: // SCCRQ - Start Control Connection Request
3035 tunnel[t].state = TUNNELOPENING;
3036 LOG(3, s, t, "Received SCCRQ\n");
3037 if (main_quit != QUIT_SHUTDOWN)
3038 {
3039 LOG(3, s, t, "sending SCCRP\n");
3040 controlt *c = controlnew(2); // sending SCCRP
3041 control16(c, 2, version, 1); // protocol version
3042 control32(c, 3, 3, 1); // framing
3043 controls(c, 7, hostname, 1); // host name
3044 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
3045 control16(c, 9, t, 1); // assigned tunnel
3046 controladd(c, 0, t); // send the resply
3047 }
3048 else
3049 {
3050 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3051 }
3052 break;
3053 case 2: // SCCRP
3054 tunnel[t].state = TUNNELOPEN;
3055 tunnel[t].lastrec = time_now;
3056 #ifdef LAC
3057 LOG(3, s, t, "Received SCCRP\n");
3058 if (main_quit != QUIT_SHUTDOWN)
3059 {
3060 if (tunnel[t].isremotelns && chapresponse)
3061 {
3062 hasht hash;
3063
3064 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3065 // check authenticator
3066 if (memcmp(hash, chapresponse, 16) == 0)
3067 {
3068 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3069 controlt *c = controlnew(3); // sending SCCCN
3070 controls(c, 7, hostname, 1); // host name
3071 controls(c, 8, Vendor_name, 1); // Vendor name
3072 control16(c, 2, version, 1); // protocol version
3073 control32(c, 3, 3, 1); // framing Capabilities
3074 control16(c, 9, t, 1); // assigned tunnel
3075 controladd(c, 0, t); // send
3076 }
3077 else
3078 {
3079 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3080 }
3081 }
3082 }
3083 else
3084 {
3085 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3086 }
3087 #endif /* LAC */
3088 break;
3089 case 3: // SCCN
3090 LOG(3, s, t, "Received SCCN\n");
3091 tunnel[t].state = TUNNELOPEN;
3092 tunnel[t].lastrec = time_now;
3093 controlnull(t); // ack
3094 break;
3095 case 4: // StopCCN
3096 LOG(3, s, t, "Received StopCCN\n");
3097 controlnull(t); // ack
3098 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3099 break;
3100 case 6: // HELLO
3101 LOG(3, s, t, "Received HELLO\n");
3102 controlnull(t); // simply ACK
3103 break;
3104 case 7: // OCRQ
3105 // TBA
3106 LOG(3, s, t, "Received OCRQ\n");
3107 break;
3108 case 8: // OCRO
3109 // TBA
3110 LOG(3, s, t, "Received OCRO\n");
3111 break;
3112 case 9: // OCCN
3113 // TBA
3114 LOG(3, s, t, "Received OCCN\n");
3115 break;
3116 case 10: // ICRQ
3117 LOG(3, s, t, "Received ICRQ\n");
3118 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3119 {
3120 controlt *c = controlnew(11); // ICRP
3121
3122 LOG(3, s, t, "Sending ICRP\n");
3123
3124 s = sessionfree;
3125 sessionfree = session[s].next;
3126 memset(&session[s], 0, sizeof(session[s]));
3127
3128 if (s > config->cluster_highest_sessionid)
3129 config->cluster_highest_sessionid = s;
3130
3131 session[s].opened = time_now;
3132 session[s].tunnel = t;
3133 session[s].far = asession;
3134 session[s].last_packet = session[s].last_data = time_now;
3135 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3136 control16(c, 14, s, 1); // assigned session
3137 controladd(c, asession, t); // send the reply
3138
3139 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3140 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3141
3142 session[s].ppp.phase = Establish;
3143 session[s].ppp.lcp = Starting;
3144
3145 STAT(session_created);
3146 break;
3147 }
3148
3149 {
3150 controlt *c = controlnew(14); // CDN
3151 LOG(3, s, t, "Sending CDN\n");
3152 if (!sessionfree)
3153 {
3154 STAT(session_overflow);
3155 LOG(1, 0, t, "No free sessions\n");
3156 control16(c, 1, 4, 0); // temporary lack of resources
3157 }
3158 else
3159 control16(c, 1, 2, 7); // shutting down, try another
3160
3161 controladd(c, asession, t); // send the message
3162 }
3163 return;
3164 case 11: // ICRP
3165 #ifdef LAC
3166 LOG(3, s, t, "Received ICRP\n");
3167 if (session[s].forwardtosession)
3168 {
3169 controlt *c = controlnew(12); // ICCN
3170
3171 session[s].opened = time_now;
3172 session[s].tunnel = t;
3173 session[s].far = asession;
3174 session[s].last_packet = session[s].last_data = time_now;
3175
3176 control32(c, 19, 1, 1); // Framing Type
3177 control32(c, 24, 10000000, 1); // Tx Connect Speed
3178 controladd(c, asession, t); // send the message
3179 LOG(3, s, t, "Sending ICCN\n");
3180 }
3181 #endif /* LAC */
3182 break;
3183 case 12: // ICCN
3184 LOG(3, s, t, "Received ICCN\n");
3185 if (amagic == 0) amagic = time_now;
3186 session[s].magic = amagic; // set magic number
3187 session[s].flags = aflags; // set flags received
3188 session[s].mru = PPPoE_MRU; // default
3189 controlnull(t); // ack
3190
3191 // start LCP
3192 sess_local[s].lcp_authtype = config->radius_authprefer;
3193 sess_local[s].ppp_mru = MRU;
3194
3195 // Set multilink options before sending initial LCP packet
3196 sess_local[s].mp_mrru = 1614;
3197 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3198
3199 sendlcp(s, t);
3200 change_state(s, lcp, RequestSent);
3201 break;
3202
3203 case 14: // CDN
3204 LOG(3, s, t, "Received CDN\n");
3205 controlnull(t); // ack
3206 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3207 break;
3208 case 0xFFFF:
3209 LOG(1, s, t, "Missing message type\n");
3210 break;
3211 default:
3212 STAT(tunnel_rx_errors);
3213 if (mandatory)
3214 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3215 else
3216 LOG(1, s, t, "Unknown message type %u\n", message);
3217 break;
3218 }
3219 if (chapresponse) free(chapresponse);
3220 cluster_send_tunnel(t);
3221 }
3222 else
3223 {
3224 LOG(4, s, t, " Got a ZLB ack\n");
3225 }
3226 }
3227 else
3228 { // data
3229 uint16_t proto;
3230
3231 LOG_HEX(5, "Receive Tunnel Data", p, l);
3232 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3233 { // HDLC address header, discard
3234 p += 2;
3235 l -= 2;
3236 }
3237 if (l < 2)
3238 {
3239 LOG(1, s, t, "Short ppp length %d\n", l);
3240 STAT(tunnel_rx_errors);
3241 return;
3242 }
3243 if (*p & 1)
3244 {
3245 proto = *p++;
3246 l--;
3247 }
3248 else
3249 {
3250 proto = ntohs(*(uint16_t *) p);
3251 p += 2;
3252 l -= 2;
3253 }
3254
3255 #ifdef LAC
3256 if (session[s].forwardtosession)
3257 {
3258 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3259 // Forward to LAC/BAS or Remote LNS session
3260 lac_session_forward(buf, len, s, proto, addr->sin_addr.s_addr, addr->sin_port);
3261 return;
3262 }
3263 else if (config->auth_tunnel_change_addr_src)
3264 {
3265 if (tunnel[t].ip != ntohl(addr->sin_addr.s_addr) &&
3266 tunnel[t].port == ntohs(addr->sin_port))
3267 {
3268 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3269 LOG(5, s, t, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3270 fmtaddr(htonl(tunnel[t].ip), 0), fmtaddr(addr->sin_addr.s_addr, 0));
3271
3272 tunnel[t].ip = ntohl(addr->sin_addr.s_addr);
3273 }
3274 }
3275 #endif /* LAC */
3276
3277 if (s && !session[s].opened) // Is something wrong??
3278 {
3279 if (!config->cluster_iam_master)
3280 {
3281 // Pass it off to the master to deal with..
3282 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3283 return;
3284 }
3285
3286 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3287 STAT(tunnel_rx_errors);
3288 return;
3289 }
3290
3291 if (proto == PPPPAP)
3292 {
3293 session[s].last_packet = time_now;
3294 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3295 processpap(s, t, p, l);
3296 }
3297 else if (proto == PPPCHAP)
3298 {
3299 session[s].last_packet = time_now;
3300 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3301 processchap(s, t, p, l);
3302 }
3303 else if (proto == PPPLCP)
3304 {
3305 session[s].last_packet = time_now;
3306 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3307 processlcp(s, t, p, l);
3308 }
3309 else if (proto == PPPIPCP)
3310 {
3311 session[s].last_packet = time_now;
3312 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3313 processipcp(s, t, p, l);
3314 }
3315 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3316 {
3317 session[s].last_packet = time_now;
3318 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3319 processipv6cp(s, t, p, l);
3320 }
3321 else if (proto == PPPCCP)
3322 {
3323 session[s].last_packet = time_now;
3324 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3325 processccp(s, t, p, l);
3326 }
3327 else if (proto == PPPIP)
3328 {
3329 if (session[s].die)
3330 {
3331 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3332 return; // closing session, PPP not processed
3333 }
3334
3335 session[s].last_packet = session[s].last_data = time_now;
3336 if (session[s].walled_garden && !config->cluster_iam_master)
3337 {
3338 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3339 return;
3340 }
3341
3342 processipin(s, t, p, l);
3343 }
3344 else if (proto == PPPMP)
3345 {
3346 if (session[s].die)
3347 {
3348 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3349 return; // closing session, PPP not processed
3350 }
3351
3352 session[s].last_packet = session[s].last_data = time_now;
3353 if (!config->cluster_iam_master)
3354 {
3355 // The fragments reconstruction is managed by the Master.
3356 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3357 return;
3358 }
3359
3360 processmpin(s, t, p, l);
3361 }
3362 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3363 {
3364 if (session[s].die)
3365 {
3366 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3367 return; // closing session, PPP not processed
3368 }
3369
3370 session[s].last_packet = session[s].last_data = time_now;
3371 if (session[s].walled_garden && !config->cluster_iam_master)
3372 {
3373 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3374 return;
3375 }
3376
3377 processipv6in(s, t, p, l);
3378 }
3379 else if (session[s].ppp.lcp == Opened)
3380 {
3381 session[s].last_packet = time_now;
3382 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3383 protoreject(s, t, p, l, proto);
3384 }
3385 else
3386 {
3387 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3388 proto, ppp_state(session[s].ppp.lcp));
3389 }
3390 }
3391 }
3392
3393 // read and process packet on tun
3394 // (i.e. this routine writes to buf[-8]).
3395 static void processtun(uint8_t * buf, int len)
3396 {
3397 LOG_HEX(5, "Receive TUN Data", buf, len);
3398 STAT(tun_rx_packets);
3399 INC_STAT(tun_rx_bytes, len);
3400
3401 CSTAT(processtun);
3402
3403 eth_rx_pkt++;
3404 eth_rx += len;
3405 if (len < 22)
3406 {
3407 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3408 STAT(tun_rx_errors);
3409 return;
3410 }
3411
3412 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3413 processipout(buf, len);
3414 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3415 && config->ipv6_prefix.s6_addr[0])
3416 processipv6out(buf, len);
3417
3418 // Else discard.
3419 }
3420
3421 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3422 // that we look at the whole of the tunnel, radius and session tables
3423 // every second
3424 static void regular_cleanups(double period)
3425 {
3426 // Next tunnel, radius and session to check for actions on.
3427 static tunnelidt t = 0;
3428 static int r = 0;
3429 static sessionidt s = 0;
3430
3431 int t_actions = 0;
3432 int r_actions = 0;
3433 int s_actions = 0;
3434
3435 int t_slice;
3436 int r_slice;
3437 int s_slice;
3438
3439 int i;
3440 int a;
3441
3442 // divide up tables into slices based on the last run
3443 t_slice = config->cluster_highest_tunnelid * period;
3444 r_slice = (MAXRADIUS - 1) * period;
3445 s_slice = config->cluster_highest_sessionid * period;
3446
3447 if (t_slice < 1)
3448 t_slice = 1;
3449 else if (t_slice > config->cluster_highest_tunnelid)
3450 t_slice = config->cluster_highest_tunnelid;
3451
3452 if (r_slice < 1)
3453 r_slice = 1;
3454 else if (r_slice > (MAXRADIUS - 1))
3455 r_slice = MAXRADIUS - 1;
3456
3457 if (s_slice < 1)
3458 s_slice = 1;
3459 else if (s_slice > config->cluster_highest_sessionid)
3460 s_slice = config->cluster_highest_sessionid;
3461
3462 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3463
3464 for (i = 0; i < t_slice; i++)
3465 {
3466 t++;
3467 if (t > config->cluster_highest_tunnelid)
3468 t = 1;
3469
3470 if (t == TUNNEL_ID_PPPOE)
3471 continue;
3472
3473 // check for expired tunnels
3474 if (tunnel[t].die && tunnel[t].die <= TIME)
3475 {
3476 STAT(tunnel_timeout);
3477 tunnelkill(t, "Expired");
3478 t_actions++;
3479 continue;
3480 }
3481 // check for message resend
3482 if (tunnel[t].retry && tunnel[t].controlc)
3483 {
3484 // resend pending messages as timeout on reply
3485 if (tunnel[t].retry <= TIME)
3486 {
3487 controlt *c = tunnel[t].controls;
3488 uint16_t w = tunnel[t].window;
3489 tunnel[t].try++; // another try
3490 if (tunnel[t].try > 5)
3491 tunnelkill(t, "Timeout on control message"); // game over
3492 else
3493 while (c && w--)
3494 {
3495 tunnelsend(c->buf, c->length, t);
3496 c = c->next;
3497 }
3498
3499 t_actions++;
3500 }
3501 }
3502 // Send hello
3503 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3504 {
3505 controlt *c = controlnew(6); // sending HELLO
3506 controladd(c, 0, t); // send the message
3507 LOG(3, 0, t, "Sending HELLO message\n");
3508 t_actions++;
3509 }
3510
3511 // Check for tunnel changes requested from the CLI
3512 if ((a = cli_tunnel_actions[t].action))
3513 {
3514 cli_tunnel_actions[t].action = 0;
3515 if (a & CLI_TUN_KILL)
3516 {
3517 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3518 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3519 t_actions++;
3520 }
3521 }
3522 }
3523
3524 for (i = 0; i < r_slice; i++)
3525 {
3526 r++;
3527 if (r >= MAXRADIUS)
3528 r = 1;
3529
3530 if (!radius[r].state)
3531 continue;
3532
3533 if (radius[r].retry <= TIME)
3534 {
3535 radiusretry(r);
3536 r_actions++;
3537 }
3538 }
3539
3540 for (i = 0; i < s_slice; i++)
3541 {
3542 s++;
3543 if (s > config->cluster_highest_sessionid)
3544 s = 1;
3545
3546 if (!session[s].opened) // Session isn't in use
3547 continue;
3548
3549 // check for expired sessions
3550 if (session[s].die)
3551 {
3552 if (session[s].die <= TIME)
3553 {
3554 sessionkill(s, "Expired");
3555 s_actions++;
3556 }
3557 continue;
3558 }
3559
3560 // PPP timeouts
3561 if (sess_local[s].lcp.restart <= time_now)
3562 {
3563 int next_state = session[s].ppp.lcp;
3564 switch (session[s].ppp.lcp)
3565 {
3566 case RequestSent:
3567 case AckReceived:
3568 next_state = RequestSent;
3569
3570 case AckSent:
3571 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3572 {
3573 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3574 sendlcp(s, session[s].tunnel);
3575 change_state(s, lcp, next_state);
3576 }
3577 else
3578 {
3579 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3580 STAT(session_timeout);
3581 }
3582
3583 s_actions++;
3584 }
3585
3586 if (session[s].die)
3587 continue;
3588 }
3589
3590 if (sess_local[s].ipcp.restart <= time_now)
3591 {
3592 int next_state = session[s].ppp.ipcp;
3593 switch (session[s].ppp.ipcp)
3594 {
3595 case RequestSent:
3596 case AckReceived:
3597 next_state = RequestSent;
3598
3599 case AckSent:
3600 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3601 {
3602 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3603 sendipcp(s, session[s].tunnel);
3604 change_state(s, ipcp, next_state);
3605 }
3606 else
3607 {
3608 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3609 STAT(session_timeout);
3610 }
3611
3612 s_actions++;
3613 }
3614
3615 if (session[s].die)
3616 continue;
3617 }
3618
3619 if (sess_local[s].ipv6cp.restart <= time_now)
3620 {
3621 int next_state = session[s].ppp.ipv6cp;
3622 switch (session[s].ppp.ipv6cp)
3623 {
3624 case RequestSent:
3625 case AckReceived:
3626 next_state = RequestSent;
3627
3628 case AckSent:
3629 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3630 {
3631 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3632 sendipv6cp(s, session[s].tunnel);
3633 change_state(s, ipv6cp, next_state);
3634 }
3635 else
3636 {
3637 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3638 change_state(s, ipv6cp, Stopped);
3639 }
3640
3641 s_actions++;
3642 }
3643 }
3644
3645 if (sess_local[s].ccp.restart <= time_now)
3646 {
3647 int next_state = session[s].ppp.ccp;
3648 switch (session[s].ppp.ccp)
3649 {
3650 case RequestSent:
3651 case AckReceived:
3652 next_state = RequestSent;
3653
3654 case AckSent:
3655 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3656 {
3657 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3658 sendccp(s, session[s].tunnel);
3659 change_state(s, ccp, next_state);
3660 }
3661 else
3662 {
3663 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3664 change_state(s, ccp, Stopped);
3665 }
3666
3667 s_actions++;
3668 }
3669 }
3670
3671 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3672 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3673 {
3674 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3675 STAT(session_timeout);
3676 s_actions++;
3677 continue;
3678 }
3679
3680 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3681 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3682 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3683 {
3684 uint8_t b[MAXETHER];
3685
3686 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3687 if (!q) continue;
3688
3689 *q = EchoReq;
3690 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3691 *(uint16_t *)(q + 2) = htons(8); // Length
3692 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3693
3694 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3695 (int)(time_now - session[s].last_packet));
3696
3697 tunnelsend(b, (q - b) + 8, session[s].tunnel); // send it
3698 sess_local[s].last_echo = time_now;
3699 s_actions++;
3700 }
3701
3702 // Drop sessions who have reached session_timeout seconds
3703 if (session[s].session_timeout)
3704 {
3705 bundleidt bid = session[s].bundle;
3706 if (bid)
3707 {
3708 if (time_now - bundle[bid].last_check >= 1)
3709 {
3710 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3711 bundle[bid].last_check = time_now;
3712 if (bundle[bid].online_time >= session[s].session_timeout)
3713 {
3714 int ses;
3715 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3716 {
3717 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3718 s_actions++;
3719 continue;
3720 }
3721 }
3722 }
3723 }
3724 else if (time_now - session[s].opened >= session[s].session_timeout)
3725 {
3726 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3727 s_actions++;
3728 continue;
3729 }
3730 }
3731
3732 // Drop sessions who have reached idle_timeout seconds
3733 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3734 {
3735 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3736 STAT(session_timeout);
3737 s_actions++;
3738 continue;
3739 }
3740
3741 // Check for actions requested from the CLI
3742 if ((a = cli_session_actions[s].action))
3743 {
3744 int send = 0;
3745
3746 cli_session_actions[s].action = 0;
3747 if (a & CLI_SESS_KILL)
3748 {
3749 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3750 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3751 a = 0; // dead, no need to check for other actions
3752 s_actions++;
3753 }
3754
3755 if (a & CLI_SESS_NOSNOOP)
3756 {
3757 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3758 session[s].snoop_ip = 0;
3759 session[s].snoop_port = 0;
3760 s_actions++;
3761 send++;
3762 }
3763 else if (a & CLI_SESS_SNOOP)
3764 {
3765 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3766 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3767 cli_session_actions[s].snoop_port);
3768
3769 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3770 session[s].snoop_port = cli_session_actions[s].snoop_port;
3771 s_actions++;
3772 send++;
3773 }
3774
3775 if (a & CLI_SESS_NOTHROTTLE)
3776 {
3777 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3778 throttle_session(s, 0, 0);
3779 s_actions++;
3780 send++;
3781 }
3782 else if (a & CLI_SESS_THROTTLE)
3783 {
3784 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3785 cli_session_actions[s].throttle_in,
3786 cli_session_actions[s].throttle_out);
3787
3788 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3789 s_actions++;
3790 send++;
3791 }
3792
3793 if (a & CLI_SESS_NOFILTER)
3794 {
3795 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3796 filter_session(s, 0, 0);
3797 s_actions++;
3798 send++;
3799 }
3800 else if (a & CLI_SESS_FILTER)
3801 {
3802 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3803 cli_session_actions[s].filter_in,
3804 cli_session_actions[s].filter_out);
3805
3806 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3807 s_actions++;
3808 send++;
3809 }
3810
3811 if (send)
3812 cluster_send_session(s);
3813 }
3814
3815 // RADIUS interim accounting
3816 if (config->radius_accounting && config->radius_interim > 0
3817 && session[s].ip && !session[s].walled_garden
3818 && !sess_local[s].radius // RADIUS already in progress
3819 && time_now - sess_local[s].last_interim >= config->radius_interim
3820 && session[s].flags & SESSION_STARTED)
3821 {
3822 int rad = radiusnew(s);
3823 if (!rad)
3824 {
3825 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3826 STAT(radius_overflow);
3827 continue;
3828 }
3829
3830 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3831 session[s].user, session[s].unique_id);
3832
3833 radiussend(rad, RADIUSINTERIM);
3834 sess_local[s].last_interim = time_now;
3835 s_actions++;
3836 }
3837 }
3838
3839 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3840 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3841 }
3842
3843 //
3844 // Are we in the middle of a tunnel update, or radius
3845 // requests??
3846 //
3847 static int still_busy(void)
3848 {
3849 int i;
3850 static clockt last_talked = 0;
3851 static clockt start_busy_wait = 0;
3852
3853 #ifdef BGP
3854 static time_t stopped_bgp = 0;
3855 if (bgp_configured)
3856 {
3857 if (!stopped_bgp)
3858 {
3859 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3860
3861 for (i = 0; i < BGP_NUM_PEERS; i++)
3862 if (bgp_peers[i].state == Established)
3863 bgp_stop(&bgp_peers[i]);
3864
3865 stopped_bgp = time_now;
3866
3867 if (!config->cluster_iam_master)
3868 {
3869 // we don't want to become master
3870 cluster_send_ping(0);
3871
3872 return 1;
3873 }
3874 }
3875
3876 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3877 return 1;
3878 }
3879 #endif /* BGP */
3880
3881 if (!config->cluster_iam_master)
3882 return 0;
3883
3884 if (main_quit == QUIT_SHUTDOWN)
3885 {
3886 static int dropped = 0;
3887 if (!dropped)
3888 {
3889 int i;
3890
3891 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3892 for (i = 1; i < MAXTUNNEL; i++)
3893 if (tunnel[i].ip || tunnel[i].state)
3894 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3895
3896 dropped = 1;
3897 }
3898 }
3899
3900 if (start_busy_wait == 0)
3901 start_busy_wait = TIME;
3902
3903 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3904 {
3905 if (!tunnel[i].controlc)
3906 continue;
3907
3908 if (last_talked != TIME)
3909 {
3910 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3911 last_talked = TIME;
3912 }
3913 return 1;
3914 }
3915
3916 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3917 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3918 {
3919 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3920 return 0;
3921 }
3922
3923 for (i = 1; i < MAXRADIUS; i++)
3924 {
3925 if (radius[i].state == RADIUSNULL)
3926 continue;
3927 if (radius[i].state == RADIUSWAIT)
3928 continue;
3929
3930 if (last_talked != TIME)
3931 {
3932 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3933 last_talked = TIME;
3934 }
3935 return 1;
3936 }
3937
3938 return 0;
3939 }
3940
3941 #ifdef HAVE_EPOLL
3942 # include <sys/epoll.h>
3943 #else
3944 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3945 # include "fake_epoll.h"
3946 #endif
3947
3948 #ifdef LAC
3949 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac, pppoedisc, pppoesess
3950 #define BASE_FDS 10
3951 #else
3952 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, pppoedisc, pppoesess
3953 #define BASE_FDS 9
3954 #endif
3955
3956 // additional polled fds
3957 #ifdef BGP
3958 # define EXTRA_FDS BGP_NUM_PEERS
3959 #else
3960 # define EXTRA_FDS 0
3961 #endif
3962
3963 // main loop - gets packets on tun or udp and processes them
3964 static void mainloop(void)
3965 {
3966 int i;
3967 uint8_t buf[65536];
3968 uint8_t *p = buf + 24; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3969 // and the forwarded pppoe session
3970 int size_bufp = sizeof(buf) - 24;
3971 clockt next_cluster_ping = 0; // send initial ping immediately
3972 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3973 int maxevent = sizeof(events)/sizeof(*events);
3974
3975 if ((epollfd = epoll_create(maxevent)) < 0)
3976 {
3977 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3978 exit(1);
3979 }
3980
3981 #ifdef LAC
3982 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d , udplacfd=%d, pppoefd=%d, pppoesessfd=%d\n",
3983 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, udplacfd, pppoediscfd, pppoesessfd);
3984 #else
3985 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d, pppoefd=%d, pppoesessfd=%d\n",
3986 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, pppoediscfd, pppoesessfd);
3987 #endif
3988
3989 /* setup our fds to poll for input */
3990 {
3991 static struct event_data d[BASE_FDS];
3992 struct epoll_event e;
3993
3994 e.events = EPOLLIN;
3995 i = 0;
3996
3997 if (clifd >= 0)
3998 {
3999 d[i].type = FD_TYPE_CLI;
4000 e.data.ptr = &d[i++];
4001 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
4002 }
4003
4004 d[i].type = FD_TYPE_CLUSTER;
4005 e.data.ptr = &d[i++];
4006 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
4007
4008 d[i].type = FD_TYPE_TUN;
4009 e.data.ptr = &d[i++];
4010 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
4011
4012 d[i].type = FD_TYPE_UDP;
4013 e.data.ptr = &d[i++];
4014 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
4015
4016 d[i].type = FD_TYPE_CONTROL;
4017 e.data.ptr = &d[i++];
4018 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
4019
4020 d[i].type = FD_TYPE_DAE;
4021 e.data.ptr = &d[i++];
4022 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
4023
4024 d[i].type = FD_TYPE_NETLINK;
4025 e.data.ptr = &d[i++];
4026 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
4027
4028 #ifdef LAC
4029 d[i].type = FD_TYPE_UDPLAC;
4030 e.data.ptr = &d[i++];
4031 epoll_ctl(epollfd, EPOLL_CTL_ADD, udplacfd, &e);
4032 #endif
4033
4034 d[i].type = FD_TYPE_PPPOEDISC;
4035 e.data.ptr = &d[i++];
4036 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoediscfd, &e);
4037
4038 d[i].type = FD_TYPE_PPPOESESS;
4039 e.data.ptr = &d[i++];
4040 epoll_ctl(epollfd, EPOLL_CTL_ADD, pppoesessfd, &e);
4041 }
4042
4043 #ifdef BGP
4044 signal(SIGPIPE, SIG_IGN);
4045 bgp_setup(config->as_number);
4046 if (config->bind_address)
4047 bgp_add_route(config->bind_address, 0xffffffff);
4048
4049 for (i = 0; i < BGP_NUM_PEERS; i++)
4050 {
4051 if (config->neighbour[i].name[0])
4052 bgp_start(&bgp_peers[i], config->neighbour[i].name,
4053 config->neighbour[i].as, config->neighbour[i].keepalive,
4054 config->neighbour[i].hold, config->neighbour[i].update_source,
4055 0); /* 0 = routing disabled */
4056 }
4057 #endif /* BGP */
4058
4059 while (!main_quit || still_busy())
4060 {
4061 int more = 0;
4062 int n;
4063
4064
4065 if (main_reload)
4066 {
4067 main_reload = 0;
4068 read_config_file();
4069 config->reload_config++;
4070 }
4071
4072 if (config->reload_config)
4073 {
4074 config->reload_config = 0;
4075 update_config();
4076 }
4077
4078 #ifdef BGP
4079 bgp_set_poll();
4080 #endif /* BGP */
4081
4082 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4083 STAT(select_called);
4084
4085 TIME = now(NULL);
4086 if (n < 0)
4087 {
4088 if (errno == EINTR ||
4089 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4090 continue;
4091
4092 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4093 break; // exit
4094 }
4095
4096 if (n)
4097 {
4098 struct sockaddr_in addr;
4099 struct in_addr local;
4100 socklen_t alen;
4101 int c, s;
4102 int udp_ready = 0;
4103 #ifdef LAC
4104 int udplac_ready = 0;
4105 int udplac_pkts = 0;
4106 #endif
4107 int pppoesess_ready = 0;
4108 int pppoesess_pkts = 0;
4109 int tun_ready = 0;
4110 int cluster_ready = 0;
4111 int udp_pkts = 0;
4112 int tun_pkts = 0;
4113 int cluster_pkts = 0;
4114 #ifdef BGP
4115 uint32_t bgp_events[BGP_NUM_PEERS];
4116 memset(bgp_events, 0, sizeof(bgp_events));
4117 #endif /* BGP */
4118
4119 for (c = n, i = 0; i < c; i++)
4120 {
4121 struct event_data *d = events[i].data.ptr;
4122
4123 switch (d->type)
4124 {
4125 case FD_TYPE_CLI: // CLI connections
4126 {
4127 int cli;
4128
4129 alen = sizeof(addr);
4130 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4131 {
4132 cli_do(cli);
4133 close(cli);
4134 }
4135 else
4136 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4137
4138 n--;
4139 break;
4140 }
4141
4142 // these are handled below, with multiple interleaved reads
4143 case FD_TYPE_CLUSTER: cluster_ready++; break;
4144 case FD_TYPE_TUN: tun_ready++; break;
4145 case FD_TYPE_UDP: udp_ready++; break;
4146 #ifdef LAC
4147 case FD_TYPE_UDPLAC: udplac_ready++; break;
4148 #endif
4149 case FD_TYPE_PPPOESESS: pppoesess_ready++; break;
4150
4151 case FD_TYPE_PPPOEDISC: // pppoe discovery
4152 s = read(pppoediscfd, p, size_bufp);
4153 if (s > 0) process_pppoe_disc(p, s);
4154 n--;
4155 break;
4156
4157 case FD_TYPE_CONTROL: // nsctl commands
4158 alen = sizeof(addr);
4159 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4160 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
4161 n--;
4162 break;
4163
4164 case FD_TYPE_DAE: // DAE requests
4165 alen = sizeof(addr);
4166 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4167 if (s > 0) processdae(buf, s, &addr, alen, &local);
4168 n--;
4169 break;
4170
4171 case FD_TYPE_RADIUS: // RADIUS response
4172 alen = sizeof(addr);
4173 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4174 if (s >= 0 && config->cluster_iam_master)
4175 {
4176 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4177 addr.sin_addr.s_addr == config->radiusserver[1])
4178 processrad(buf, s, d->index);
4179 else
4180 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4181 fmtaddr(addr.sin_addr.s_addr, 0));
4182 }
4183
4184 n--;
4185 break;
4186
4187 #ifdef BGP
4188 case FD_TYPE_BGP:
4189 bgp_events[d->index] = events[i].events;
4190 n--;
4191 break;
4192 #endif /* BGP */
4193
4194 case FD_TYPE_NETLINK:
4195 {
4196 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
4197 s = netlink_recv(buf, sizeof(buf));
4198 if (nh->nlmsg_type == NLMSG_ERROR)
4199 {
4200 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4201 if (errmsg->error)
4202 {
4203 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4204 {
4205 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4206 exit(1);
4207 }
4208 else
4209
4210 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4211 }
4212 // else it's a ack
4213 }
4214 else
4215 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);
4216 n--;
4217 break;
4218 }
4219
4220 default:
4221 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4222 }
4223 }
4224
4225 #ifdef BGP
4226 bgp_process(bgp_events);
4227 #endif /* BGP */
4228
4229 for (c = 0; n && c < config->multi_read_count; c++)
4230 {
4231 // L2TP
4232 if (udp_ready)
4233 {
4234 alen = sizeof(addr);
4235 if ((s = recvfrom(udpfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4236 {
4237 processudp(p, s, &addr);
4238 udp_pkts++;
4239 }
4240 else
4241 {
4242 udp_ready = 0;
4243 n--;
4244 }
4245 }
4246 #ifdef LAC
4247 // L2TP REMOTE LNS
4248 if (udplac_ready)
4249 {
4250 alen = sizeof(addr);
4251 if ((s = recvfrom(udplacfd, p, size_bufp, 0, (void *) &addr, &alen)) > 0)
4252 {
4253 if (!config->disable_lac_func)
4254 processudp(p, s, &addr);
4255
4256 udplac_pkts++;
4257 }
4258 else
4259 {
4260 udplac_ready = 0;
4261 n--;
4262 }
4263 }
4264 #endif
4265 // incoming IP
4266 if (tun_ready)
4267 {
4268 if ((s = read(tunfd, p, size_bufp)) > 0)
4269 {
4270 processtun(p, s);
4271 tun_pkts++;
4272 }
4273 else
4274 {
4275 tun_ready = 0;
4276 n--;
4277 }
4278 }
4279
4280 // pppoe session
4281 if (pppoesess_ready)
4282 {
4283 if ((s = read(pppoesessfd, p, size_bufp)) > 0)
4284 {
4285 process_pppoe_sess(p, s);
4286 pppoesess_pkts++;
4287 }
4288 else
4289 {
4290 pppoesess_ready = 0;
4291 n--;
4292 }
4293 }
4294
4295 // cluster
4296 if (cluster_ready)
4297 {
4298 alen = sizeof(addr);
4299 if ((s = recvfrom(cluster_sockfd, p, size_bufp, MSG_WAITALL, (void *) &addr, &alen)) > 0)
4300 {
4301 processcluster(p, s, addr.sin_addr.s_addr);
4302 cluster_pkts++;
4303 }
4304 else
4305 {
4306 cluster_ready = 0;
4307 n--;
4308 }
4309 }
4310 }
4311
4312 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
4313 STAT(multi_read_used);
4314
4315 if (c >= config->multi_read_count)
4316 {
4317 #ifdef LAC
4318 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d rmlns packets\n",
4319 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, udplac_pkts);
4320 #else
4321 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
4322 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
4323 #endif
4324 STAT(multi_read_exceeded);
4325 more++;
4326 }
4327 }
4328 #ifdef BGP
4329 else
4330 /* no event received, but timers could still have expired */
4331 bgp_process_peers_timers();
4332 #endif /* BGP */
4333
4334 if (time_changed)
4335 {
4336 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4337
4338 // Log current traffic stats
4339 snprintf(config->bandwidth, sizeof(config->bandwidth),
4340 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4341 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4342 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4343 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4344
4345 udp_tx = udp_rx = 0;
4346 udp_rx_pkt = eth_rx_pkt = 0;
4347 eth_tx = eth_rx = 0;
4348 time_changed = 0;
4349
4350 if (config->dump_speed)
4351 printf("%s\n", config->bandwidth);
4352
4353 // Update the internal time counter
4354 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4355
4356 {
4357 // Run timer hooks
4358 struct param_timer p = { time_now };
4359 run_plugins(PLUGIN_TIMER, &p);
4360 }
4361 }
4362
4363 // Runs on every machine (master and slaves).
4364 if (next_cluster_ping <= TIME)
4365 {
4366 // Check to see which of the cluster is still alive..
4367
4368 cluster_send_ping(basetime); // Only does anything if we're a slave
4369 cluster_check_master(); // ditto.
4370
4371 cluster_heartbeat(); // Only does anything if we're a master.
4372 cluster_check_slaves(); // ditto.
4373
4374 master_update_counts(); // If we're a slave, send our byte counters to our master.
4375
4376 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4377 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4378 else
4379 next_cluster_ping = TIME + config->cluster_hb_interval;
4380 }
4381
4382 if (!config->cluster_iam_master)
4383 continue;
4384
4385 // Run token bucket filtering queue..
4386 // Only run it every 1/10th of a second.
4387 {
4388 static clockt last_run = 0;
4389 if (last_run != TIME)
4390 {
4391 last_run = TIME;
4392 tbf_run_timer();
4393 }
4394 }
4395
4396 // Handle timeouts, retries etc.
4397 {
4398 static double last_clean = 0;
4399 double this_clean;
4400 double diff;
4401
4402 TIME = now(&this_clean);
4403 diff = this_clean - last_clean;
4404
4405 // Run during idle time (after we've handled
4406 // all incoming packets) or every 1/10th sec
4407 if (!more || diff > 0.1)
4408 {
4409 regular_cleanups(diff);
4410 last_clean = this_clean;
4411 }
4412 }
4413
4414 if (*config->accounting_dir)
4415 {
4416 static clockt next_acct = 0;
4417 static clockt next_shut_acct = 0;
4418
4419 if (next_acct <= TIME)
4420 {
4421 // Dump accounting data
4422 next_acct = TIME + ACCT_TIME;
4423 next_shut_acct = TIME + ACCT_SHUT_TIME;
4424 dump_acct_info(1);
4425 }
4426 else if (next_shut_acct <= TIME)
4427 {
4428 // Dump accounting data for shutdown sessions
4429 next_shut_acct = TIME + ACCT_SHUT_TIME;
4430 if (shut_acct_n)
4431 dump_acct_info(0);
4432 }
4433 }
4434 }
4435
4436 // Are we the master and shutting down??
4437 if (config->cluster_iam_master)
4438 cluster_heartbeat(); // Flush any queued changes..
4439
4440 // Ok. Notify everyone we're shutting down. If we're
4441 // the master, this will force an election.
4442 cluster_send_ping(0);
4443
4444 //
4445 // Important!!! We MUST not process any packets past this point!
4446 LOG(1, 0, 0, "Shutdown complete\n");
4447 }
4448
4449 static void stripdomain(char *host)
4450 {
4451 char *p;
4452
4453 if ((p = strchr(host, '.')))
4454 {
4455 char *domain = 0;
4456 char _domain[1024];
4457
4458 // strip off domain
4459 FILE *resolv = fopen("/etc/resolv.conf", "r");
4460 if (resolv)
4461 {
4462 char buf[1024];
4463 char *b;
4464
4465 while (fgets(buf, sizeof(buf), resolv))
4466 {
4467 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4468 continue;
4469
4470 if (!isspace(buf[6]))
4471 continue;
4472
4473 b = buf + 7;
4474 while (isspace(*b)) b++;
4475
4476 if (*b)
4477 {
4478 char *d = b;
4479 while (*b && !isspace(*b)) b++;
4480 *b = 0;
4481 if (buf[0] == 'd') // domain is canonical
4482 {
4483 domain = d;
4484 break;
4485 }
4486
4487 // first search line
4488 if (!domain)
4489 {
4490 // hold, may be subsequent domain line
4491 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4492 domain = _domain;
4493 }
4494 }
4495 }
4496
4497 fclose(resolv);
4498 }
4499
4500 if (domain)
4501 {
4502 int hl = strlen(host);
4503 int dl = strlen(domain);
4504 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4505 host[hl -dl - 1] = 0;
4506 }
4507 else
4508 {
4509 *p = 0; // everything after first dot
4510 }
4511 }
4512 }
4513
4514 // Init data structures
4515 static void initdata(int optdebug, char *optconfig)
4516 {
4517 int i;
4518
4519 if (!(config = shared_malloc(sizeof(configt))))
4520 {
4521 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4522 exit(1);
4523 }
4524
4525 memset(config, 0, sizeof(configt));
4526 time(&config->start_time);
4527 strncpy(config->config_file, optconfig, strlen(optconfig));
4528 config->debug = optdebug;
4529 config->num_tbfs = MAXTBFS;
4530 config->rl_rate = 28; // 28kbps
4531 config->cluster_mcast_ttl = 1;
4532 config->cluster_master_min_adv = 1;
4533 config->ppp_restart_time = 3;
4534 config->ppp_max_configure = 10;
4535 config->ppp_max_failure = 5;
4536 config->kill_timedout_sessions = 1;
4537 strcpy(config->random_device, RANDOMDEVICE);
4538 // Set default value echo_timeout and idle_echo_timeout
4539 config->echo_timeout = ECHO_TIMEOUT;
4540 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4541
4542 log_stream = stderr;
4543
4544 #ifdef RINGBUFFER
4545 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4546 {
4547 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4548 exit(1);
4549 }
4550 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4551 #endif
4552
4553 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4554 {
4555 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4556 exit(1);
4557 }
4558 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4559 {
4560 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4561 exit(1);
4562 }
4563 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4564 {
4565 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4566 exit(1);
4567 }
4568 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4569 {
4570 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4571 exit(1);
4572 }
4573 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4574 {
4575 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4576 exit(1);
4577 }
4578
4579 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4580 {
4581 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4582 exit(1);
4583 }
4584
4585 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4586 {
4587 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4588 exit(1);
4589 }
4590
4591 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4592 {
4593 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4594 exit(1);
4595 }
4596
4597 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4598 {
4599 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4600 exit(1);
4601 }
4602 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4603
4604 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4605 {
4606 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4607 exit(1);
4608 }
4609 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4610
4611 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4612 {
4613 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4614 exit(1);
4615 }
4616 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4617
4618 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4619 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4620 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4621 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4622 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4623
4624 // Put all the sessions on the free list marked as undefined.
4625 for (i = 1; i < MAXSESSION; i++)
4626 {
4627 session[i].next = i + 1;
4628 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4629 }
4630 session[MAXSESSION - 1].next = 0;
4631 sessionfree = 1;
4632
4633 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4634 for (i = 1; i < MAXTUNNEL; i++)
4635 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4636
4637 for (i = 1; i < MAXBUNDLE; i++) {
4638 bundle[i].state = BUNDLEUNDEF;
4639 }
4640
4641 if (!*hostname)
4642 {
4643 // Grab my hostname unless it's been specified
4644 gethostname(hostname, sizeof(hostname));
4645 stripdomain(hostname);
4646 }
4647
4648 _statistics->start_time = _statistics->last_reset = time(NULL);
4649
4650 #ifdef BGP
4651 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4652 {
4653 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4654 exit(1);
4655 }
4656 #endif /* BGP */
4657
4658 #ifdef LAC
4659 lac_initremotelnsdata();
4660 #endif
4661 }
4662
4663 static int assign_ip_address(sessionidt s)
4664 {
4665 uint32_t i;
4666 int best = -1;
4667 time_t best_time = time_now;
4668 char *u = session[s].user;
4669 char reuse = 0;
4670
4671
4672 CSTAT(assign_ip_address);
4673
4674 for (i = 1; i < ip_pool_size; i++)
4675 {
4676 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4677 continue;
4678
4679 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4680 {
4681 best = i;
4682 reuse = 1;
4683 break;
4684 }
4685
4686 if (ip_address_pool[i].last < best_time)
4687 {
4688 best = i;
4689 if (!(best_time = ip_address_pool[i].last))
4690 break; // never used, grab this one
4691 }
4692 }
4693
4694 if (best < 0)
4695 {
4696 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4697 return 0;
4698 }
4699
4700 session[s].ip = ip_address_pool[best].address;
4701 session[s].ip_pool_index = best;
4702 ip_address_pool[best].assigned = 1;
4703 ip_address_pool[best].last = time_now;
4704 ip_address_pool[best].session = s;
4705 if (session[s].walled_garden)
4706 /* Don't track addresses of users in walled garden (note: this
4707 means that their address isn't "sticky" even if they get
4708 un-gardened). */
4709 ip_address_pool[best].user[0] = 0;
4710 else
4711 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4712
4713 STAT(ip_allocated);
4714 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4715 reuse ? "Reusing" : "Allocating", best);
4716
4717 return 1;
4718 }
4719
4720 static void free_ip_address(sessionidt s)
4721 {
4722 int i = session[s].ip_pool_index;
4723
4724
4725 CSTAT(free_ip_address);
4726
4727 if (!session[s].ip)
4728 return; // what the?
4729
4730 if (i < 0) // Is this actually part of the ip pool?
4731 i = 0;
4732
4733 STAT(ip_freed);
4734 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4735 session[s].ip = 0;
4736 ip_address_pool[i].assigned = 0;
4737 ip_address_pool[i].session = 0;
4738 ip_address_pool[i].last = time_now;
4739 }
4740
4741 //
4742 // Fsck the address pool against the session table.
4743 // Normally only called when we become a master.
4744 //
4745 // This isn't perfect: We aren't keep tracking of which
4746 // users used to have an IP address.
4747 //
4748 void rebuild_address_pool(void)
4749 {
4750 int i;
4751
4752 //
4753 // Zero the IP pool allocation, and build
4754 // a map from IP address to pool index.
4755 for (i = 1; i < MAXIPPOOL; ++i)
4756 {
4757 ip_address_pool[i].assigned = 0;
4758 ip_address_pool[i].session = 0;
4759 if (!ip_address_pool[i].address)
4760 continue;
4761
4762 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4763 }
4764
4765 for (i = 0; i < MAXSESSION; ++i)
4766 {
4767 int ipid;
4768 if (!(session[i].opened && session[i].ip))
4769 continue;
4770
4771 ipid = - lookup_ipmap(htonl(session[i].ip));
4772
4773 if (session[i].ip_pool_index < 0)
4774 {
4775 // Not allocated out of the pool.
4776 if (ipid < 1) // Not found in the pool either? good.
4777 continue;
4778
4779 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4780 i, fmtaddr(session[i].ip, 0), ipid);
4781
4782 // Fall through and process it as part of the pool.
4783 }
4784
4785
4786 if (ipid > MAXIPPOOL || ipid < 0)
4787 {
4788 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4789 ipid = -1;
4790 session[i].ip_pool_index = ipid;
4791 continue;
4792 }
4793
4794 ip_address_pool[ipid].assigned = 1;
4795 ip_address_pool[ipid].session = i;
4796 ip_address_pool[ipid].last = time_now;
4797 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4798 session[i].ip_pool_index = ipid;
4799 cache_ipmap(session[i].ip, i); // Fix the ip map.
4800 }
4801 }
4802
4803 //
4804 // Fix the address pool to match a changed session.
4805 // (usually when the master sends us an update).
4806 static void fix_address_pool(int sid)
4807 {
4808 int ipid;
4809
4810 ipid = session[sid].ip_pool_index;
4811
4812 if (ipid > ip_pool_size)
4813 return; // Ignore it. rebuild_address_pool will fix it up.
4814
4815 if (ip_address_pool[ipid].address != session[sid].ip)
4816 return; // Just ignore it. rebuild_address_pool will take care of it.
4817
4818 ip_address_pool[ipid].assigned = 1;
4819 ip_address_pool[ipid].session = sid;
4820 ip_address_pool[ipid].last = time_now;
4821 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4822 }
4823
4824 //
4825 // Add a block of addresses to the IP pool to hand out.
4826 //
4827 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4828 {
4829 int i;
4830 if (prefixlen == 0)
4831 prefixlen = 32; // Host route only.
4832
4833 addr &= 0xffffffff << (32 - prefixlen);
4834
4835 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4836 return ;
4837
4838 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4839 {
4840 if ((i & 0xff) == 0 || (i&0xff) == 255)
4841 continue; // Skip 0 and broadcast addresses.
4842
4843 ip_address_pool[ip_pool_size].address = i;
4844 ip_address_pool[ip_pool_size].assigned = 0;
4845 ++ip_pool_size;
4846 if (ip_pool_size >= MAXIPPOOL)
4847 {
4848 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4849 return;
4850 }
4851 }
4852 }
4853
4854 // Initialize the IP address pool
4855 static void initippool()
4856 {
4857 FILE *f;
4858 char *p;
4859 char buf[4096];
4860 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4861
4862 if (!(f = fopen(IPPOOLFILE, "r")))
4863 {
4864 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4865 exit(1);
4866 }
4867
4868 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4869 {
4870 char *pool = buf;
4871 buf[4095] = 0; // Force it to be zero terminated/
4872
4873 if (*buf == '#' || *buf == '\n')
4874 continue; // Skip comments / blank lines
4875 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4876 if ((p = (char *)strchr(buf, ':')))
4877 {
4878 in_addr_t src;
4879 *p = '\0';
4880 src = inet_addr(buf);
4881 if (src == INADDR_NONE)
4882 {
4883 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4884 exit(1);
4885 }
4886 // This entry is for a specific IP only
4887 if (src != config->bind_address)
4888 continue;
4889 *p = ':';
4890 pool = p+1;
4891 }
4892 if ((p = (char *)strchr(pool, '/')))
4893 {
4894 // It's a range
4895 int numbits = 0;
4896 in_addr_t start = 0;
4897
4898 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4899 *p++ = 0;
4900 if (!*p || !(numbits = atoi(p)))
4901 {
4902 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4903 continue;
4904 }
4905 start = ntohl(inet_addr(pool));
4906
4907 // Add a static route for this pool
4908 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4909 fmtaddr(htonl(start), 0), numbits);
4910
4911 routeset(0, start, numbits, 0, 1);
4912
4913 add_to_ip_pool(start, numbits);
4914 }
4915 else
4916 {
4917 // It's a single ip address
4918 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4919 }
4920 }
4921 fclose(f);
4922 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4923 }
4924
4925 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4926 {
4927 struct sockaddr_in snoop_addr = {0};
4928 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4929 return;
4930
4931 snoop_addr.sin_family = AF_INET;
4932 snoop_addr.sin_addr.s_addr = destination;
4933 snoop_addr.sin_port = ntohs(port);
4934
4935 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4936 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4937 htons(snoop_addr.sin_port));
4938
4939 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4940 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4941
4942 STAT(packets_snooped);
4943 }
4944
4945 static int dump_session(FILE **f, sessiont *s)
4946 {
4947 #ifdef LAC
4948 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4949 #else
4950 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4951 #endif
4952 return 1;
4953
4954 if (!*f)
4955 {
4956 char filename[1024];
4957 char timestr[64];
4958 time_t now = time(NULL);
4959
4960 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4961 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4962
4963 if (!(*f = fopen(filename, "w")))
4964 {
4965 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4966 return 0;
4967 }
4968
4969 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4970 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4971 "# host: %s\n"
4972 "# endpoint: %s\n"
4973 "# time: %ld\n"
4974 "# uptime: %ld\n"
4975 "# format: username ip qos uptxoctets downrxoctets\n",
4976 hostname,
4977 fmtaddr(config->iftun_address ? config->iftun_address : my_address, 0),
4978 now,
4979 now - basetime);
4980 }
4981
4982 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4983 fprintf(*f, "%s %s %d %u %u\n",
4984 s->user, // username
4985 fmtaddr(htonl(s->ip), 0), // ip
4986 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4987 (uint32_t) s->cin_delta, // uptxoctets
4988 (uint32_t) s->cout_delta); // downrxoctets
4989
4990 s->cin_delta = s->cout_delta = 0;
4991
4992 return 1;
4993 }
4994
4995 static void dump_acct_info(int all)
4996 {
4997 int i;
4998 FILE *f = NULL;
4999
5000
5001 CSTAT(dump_acct_info);
5002
5003 if (shut_acct_n)
5004 {
5005 for (i = 0; i < shut_acct_n; i++)
5006 dump_session(&f, &shut_acct[i]);
5007
5008 shut_acct_n = 0;
5009 }
5010
5011 if (all)
5012 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5013 dump_session(&f, &session[i]);
5014
5015 if (f)
5016 fclose(f);
5017 }
5018
5019 // Main program
5020 int main(int argc, char *argv[])
5021 {
5022 int i;
5023 int optdebug = 0;
5024 char *optconfig = CONFIGFILE;
5025
5026 time(&basetime); // start clock
5027
5028 // scan args
5029 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
5030 {
5031 switch (i)
5032 {
5033 case 'd':
5034 if (fork()) exit(0);
5035 setsid();
5036 freopen("/dev/null", "r", stdin);
5037 freopen("/dev/null", "w", stdout);
5038 freopen("/dev/null", "w", stderr);
5039 break;
5040 case 'v':
5041 optdebug++;
5042 break;
5043 case 'c':
5044 optconfig = optarg;
5045 break;
5046 case 'h':
5047 snprintf(hostname, sizeof(hostname), "%s", optarg);
5048 break;
5049 default:
5050 printf("Args are:\n"
5051 "\t-d\t\tDetach from terminal\n"
5052 "\t-c <file>\tConfig file\n"
5053 "\t-h <hostname>\tForce hostname\n"
5054 "\t-v\t\tDebug\n");
5055
5056 return (0);
5057 break;
5058 }
5059 }
5060
5061 // Start the timer routine off
5062 time(&time_now);
5063 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
5064
5065 initplugins();
5066 initdata(optdebug, optconfig);
5067
5068 init_cli();
5069 read_config_file();
5070 /* set hostname /after/ having read the config file */
5071 if (*config->hostname)
5072 strcpy(hostname, config->hostname);
5073 cli_init_complete(hostname);
5074 update_config();
5075 init_tbf(config->num_tbfs);
5076
5077 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
5078 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5079 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5080 {
5081 struct rlimit rlim;
5082 rlim.rlim_cur = RLIM_INFINITY;
5083 rlim.rlim_max = RLIM_INFINITY;
5084 // Remove the maximum core size
5085 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5086 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5087
5088 // Make core dumps go to /tmp
5089 chdir("/tmp");
5090 }
5091
5092 if (config->scheduler_fifo)
5093 {
5094 int ret;
5095 struct sched_param params = {0};
5096 params.sched_priority = 1;
5097
5098 if (get_nprocs() < 2)
5099 {
5100 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5101 config->scheduler_fifo = 0;
5102 }
5103 else
5104 {
5105 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5106 {
5107 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5108 }
5109 else
5110 {
5111 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5112 config->scheduler_fifo = 0;
5113 }
5114 }
5115 }
5116
5117 initnetlink();
5118
5119 /* Set up the cluster communications port. */
5120 if (cluster_init() < 0)
5121 exit(1);
5122
5123 inittun();
5124 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevicename);
5125
5126 if (*config->pppoe_if_to_bind)
5127 {
5128 init_pppoe();
5129 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config->pppoe_if_to_bind);
5130 }
5131 initudp();
5132 initrad();
5133 initippool();
5134
5135 // seed prng
5136 {
5137 unsigned seed = time_now ^ getpid();
5138 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5139 srand(seed);
5140 }
5141
5142 signal(SIGHUP, sighup_handler);
5143 signal(SIGCHLD, sigchild_handler);
5144 signal(SIGTERM, shutdown_handler);
5145 signal(SIGINT, shutdown_handler);
5146 signal(SIGQUIT, shutdown_handler);
5147
5148 // Prevent us from getting paged out
5149 if (config->lock_pages)
5150 {
5151 if (!mlockall(MCL_CURRENT))
5152 LOG(1, 0, 0, "Locking pages into memory\n");
5153 else
5154 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5155 }
5156
5157 mainloop();
5158
5159 /* remove plugins (so cleanup code gets run) */
5160 plugins_done();
5161
5162 // Remove the PID file if we wrote it
5163 if (config->wrote_pid && *config->pid_file == '/')
5164 unlink(config->pid_file);
5165
5166 /* kill CLI children */
5167 signal(SIGTERM, SIG_IGN);
5168 kill(0, SIGTERM);
5169 return 0;
5170 }
5171
5172 static void sighup_handler(int sig)
5173 {
5174 main_reload++;
5175 }
5176
5177 static void shutdown_handler(int sig)
5178 {
5179 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5180 }
5181
5182 static void sigchild_handler(int sig)
5183 {
5184 while (waitpid(-1, NULL, WNOHANG) > 0)
5185 ;
5186 }
5187
5188 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5189 {
5190 MD5_CTX ctx;
5191 *challenge_response = NULL;
5192
5193 if (!*config->l2tp_secret)
5194 {
5195 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5196 return;
5197 }
5198
5199 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5200
5201 *challenge_response = calloc(17, 1);
5202
5203 MD5_Init(&ctx);
5204 MD5_Update(&ctx, &id, 1);
5205 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5206 MD5_Update(&ctx, challenge, challenge_length);
5207 MD5_Final(*challenge_response, &ctx);
5208
5209 return;
5210 }
5211
5212 static int facility_value(char *name)
5213 {
5214 int i;
5215 for (i = 0; facilitynames[i].c_name; i++)
5216 {
5217 if (strcmp(facilitynames[i].c_name, name) == 0)
5218 return facilitynames[i].c_val;
5219 }
5220 return 0;
5221 }
5222
5223 static void update_config()
5224 {
5225 int i;
5226 char *p;
5227 static int timeout = 0;
5228 static int interval = 0;
5229
5230 // Update logging
5231 closelog();
5232 syslog_log = 0;
5233 if (log_stream)
5234 {
5235 if (log_stream != stderr)
5236 fclose(log_stream);
5237
5238 log_stream = NULL;
5239 }
5240
5241 if (*config->log_filename)
5242 {
5243 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5244 {
5245 char *p = config->log_filename + 7;
5246 if (*p)
5247 {
5248 openlog("l2tpns", LOG_PID, facility_value(p));
5249 syslog_log = 1;
5250 }
5251 }
5252 else if (strchr(config->log_filename, '/') == config->log_filename)
5253 {
5254 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5255 {
5256 fseek(log_stream, 0, SEEK_END);
5257 setbuf(log_stream, NULL);
5258 }
5259 else
5260 {
5261 log_stream = stderr;
5262 setbuf(log_stream, NULL);
5263 }
5264 }
5265 }
5266 else
5267 {
5268 log_stream = stderr;
5269 setbuf(log_stream, NULL);
5270 }
5271
5272 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5273 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5274
5275 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5276 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5277 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5278
5279 // reset MRU/MSS globals
5280 MRU = config->l2tp_mtu - L2TP_HDRS;
5281 if (MRU > PPPoE_MRU)
5282 MRU = PPPoE_MRU;
5283
5284 MSS = MRU - TCP_HDRS;
5285
5286 // Update radius
5287 config->numradiusservers = 0;
5288 for (i = 0; i < MAXRADSERVER; i++)
5289 if (config->radiusserver[i])
5290 {
5291 config->numradiusservers++;
5292 // Set radius port: if not set, take the port from the
5293 // first radius server. For the first radius server,
5294 // take the #defined default value from l2tpns.h
5295
5296 // test twice, In case someone works with
5297 // a secondary radius server without defining
5298 // a primary one, this will work even then.
5299 if (i > 0 && !config->radiusport[i])
5300 config->radiusport[i] = config->radiusport[i-1];
5301 if (!config->radiusport[i])
5302 config->radiusport[i] = RADPORT;
5303 }
5304
5305 if (!config->numradiusservers)
5306 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5307
5308 // parse radius_authtypes_s
5309 config->radius_authtypes = config->radius_authprefer = 0;
5310 p = config->radius_authtypes_s;
5311 while (p && *p)
5312 {
5313 char *s = strpbrk(p, " \t,");
5314 int type = 0;
5315
5316 if (s)
5317 {
5318 *s++ = 0;
5319 while (*s == ' ' || *s == '\t')
5320 s++;
5321
5322 if (!*s)
5323 s = 0;
5324 }
5325
5326 if (!strncasecmp("chap", p, strlen(p)))
5327 type = AUTHCHAP;
5328 else if (!strncasecmp("pap", p, strlen(p)))
5329 type = AUTHPAP;
5330 else
5331 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5332
5333 config->radius_authtypes |= type;
5334 if (!config->radius_authprefer)
5335 config->radius_authprefer = type;
5336
5337 p = s;
5338 }
5339
5340 if (!config->radius_authtypes)
5341 {
5342 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5343 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5344 }
5345
5346 // normalise radius_authtypes_s
5347 if (config->radius_authprefer == AUTHPAP)
5348 {
5349 strcpy(config->radius_authtypes_s, "pap");
5350 if (config->radius_authtypes & AUTHCHAP)
5351 strcat(config->radius_authtypes_s, ", chap");
5352 }
5353 else
5354 {
5355 strcpy(config->radius_authtypes_s, "chap");
5356 if (config->radius_authtypes & AUTHPAP)
5357 strcat(config->radius_authtypes_s, ", pap");
5358 }
5359
5360 if (!config->radius_dae_port)
5361 config->radius_dae_port = DAEPORT;
5362
5363 #ifdef LAC
5364 if(!config->bind_portremotelns)
5365 config->bind_portremotelns = L2TPLACPORT;
5366 if(!config->bind_address_remotelns)
5367 config->bind_address_remotelns = INADDR_ANY;
5368 #endif
5369 if(!config->iftun_address)
5370 config->iftun_address = config->bind_address;
5371
5372 if (!*config->pppoe_ac_name)
5373 strncpy(config->pppoe_ac_name, DEFAULT_PPPOE_AC_NAME, sizeof(config->pppoe_ac_name) - 1);
5374
5375 // re-initialise the random number source
5376 initrandom(config->random_device);
5377
5378 // Update plugins
5379 for (i = 0; i < MAXPLUGINS; i++)
5380 {
5381 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5382 continue;
5383
5384 if (*config->plugins[i])
5385 {
5386 // Plugin added
5387 add_plugin(config->plugins[i]);
5388 }
5389 else if (*config->old_plugins[i])
5390 {
5391 // Plugin removed
5392 remove_plugin(config->old_plugins[i]);
5393 }
5394 }
5395
5396 // Guest change
5397 guest_accounts_num = 0;
5398 char *p2 = config->guest_user;
5399 while (p2 && *p2)
5400 {
5401 char *s = strpbrk(p2, " \t,");
5402 if (s)
5403 {
5404 *s++ = 0;
5405 while (*s == ' ' || *s == '\t')
5406 s++;
5407
5408 if (!*s)
5409 s = 0;
5410 }
5411
5412 strcpy(guest_users[guest_accounts_num], p2);
5413 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5414 guest_accounts_num++;
5415 p2 = s;
5416 }
5417 // Rebuild the guest_user array
5418 strcpy(config->guest_user, "");
5419 int ui = 0;
5420 for (ui=0; ui<guest_accounts_num; ui++)
5421 {
5422 strcat(config->guest_user, guest_users[ui]);
5423 if (ui<guest_accounts_num-1)
5424 {
5425 strcat(config->guest_user, ",");
5426 }
5427 }
5428
5429
5430 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5431 if (!config->multi_read_count) config->multi_read_count = 10;
5432 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5433 if (!*config->cluster_interface)
5434 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5435
5436 if (!config->cluster_hb_interval)
5437 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5438
5439 if (!config->cluster_hb_timeout)
5440 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5441
5442 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5443 {
5444 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5445 // late, ensure we're sufficiently larger than that
5446 int t = 4 * config->cluster_hb_interval + 11;
5447
5448 if (config->cluster_hb_timeout < t)
5449 {
5450 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5451 config->cluster_hb_timeout = t;
5452 }
5453
5454 // Push timing changes to the slaves immediately if we're the master
5455 if (config->cluster_iam_master)
5456 cluster_heartbeat();
5457
5458 interval = config->cluster_hb_interval;
5459 timeout = config->cluster_hb_timeout;
5460 }
5461
5462 // Write PID file
5463 if (*config->pid_file == '/' && !config->wrote_pid)
5464 {
5465 FILE *f;
5466 if ((f = fopen(config->pid_file, "w")))
5467 {
5468 fprintf(f, "%d\n", getpid());
5469 fclose(f);
5470 config->wrote_pid = 1;
5471 }
5472 else
5473 {
5474 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5475 }
5476 }
5477 }
5478
5479 static void read_config_file()
5480 {
5481 FILE *f;
5482
5483 if (!config->config_file) return;
5484 if (!(f = fopen(config->config_file, "r")))
5485 {
5486 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5487 return;
5488 }
5489
5490 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5491 cli_do_file(f);
5492 LOG(3, 0, 0, "Done reading config file\n");
5493 fclose(f);
5494 }
5495
5496 int sessionsetup(sessionidt s, tunnelidt t)
5497 {
5498 // A session now exists, set it up
5499 in_addr_t ip;
5500 char *user;
5501 sessionidt i;
5502 int r;
5503
5504 CSTAT(sessionsetup);
5505
5506 LOG(3, s, t, "Doing session setup for session\n");
5507
5508 // Join a bundle if the MRRU option is accepted
5509 if(session[s].mrru > 0 && session[s].bundle == 0)
5510 {
5511 LOG(3, s, t, "This session can be part of multilink bundle\n");
5512 if (join_bundle(s) > 0)
5513 cluster_send_bundle(session[s].bundle);
5514 else
5515 {
5516 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5517 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5518 return 0;
5519 }
5520 }
5521
5522 if (!session[s].ip)
5523 {
5524 assign_ip_address(s);
5525 if (!session[s].ip)
5526 {
5527 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5528 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5529 return 0;
5530 }
5531 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5532 fmtaddr(htonl(session[s].ip), 0));
5533 }
5534
5535 // Make sure this is right
5536 session[s].tunnel = t;
5537
5538 // zap old sessions with same IP and/or username
5539 // Don't kill gardened sessions - doing so leads to a DoS
5540 // from someone who doesn't need to know the password
5541 {
5542 ip = session[s].ip;
5543 user = session[s].user;
5544 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5545 {
5546 if (i == s) continue;
5547 if (!session[s].opened) break;
5548 // Allow duplicate sessions for multilink ones of the same bundle.
5549 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5550
5551 if (ip == session[i].ip)
5552 {
5553 sessionshutdown(i, "Duplicate IP address", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5554 continue;
5555 }
5556
5557 if (config->allow_duplicate_users) continue;
5558 if (session[s].walled_garden || session[i].walled_garden) continue;
5559 // Guest change
5560 int found = 0;
5561 int gu;
5562 for (gu = 0; gu < guest_accounts_num; gu++)
5563 {
5564 if (!strcasecmp(user, guest_users[gu]))
5565 {
5566 found = 1;
5567 break;
5568 }
5569 }
5570 if (found) continue;
5571
5572 // Drop the new session in case of duplicate sessionss, not the old one.
5573 if (!strcasecmp(user, session[i].user))
5574 sessionshutdown(i, "Duplicate session for users", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
5575 }
5576 }
5577
5578 // no need to set a route for the same IP address of the bundle
5579 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5580 {
5581 int routed = 0;
5582
5583 // Add the route for this session.
5584 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5585 {
5586 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5587 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5588 routed++;
5589
5590 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5591 }
5592
5593 // Static IPs need to be routed if not already
5594 // convered by a Framed-Route. Anything else is part
5595 // of the IP address pool and is already routed, it
5596 // just needs to be added to the IP cache.
5597 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5598 if (session[s].ip_pool_index == -1) // static ip
5599 {
5600 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5601 }
5602 else
5603 cache_ipmap(session[s].ip, s);
5604 }
5605
5606 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5607 lcp_open(s, t); // transition to Network phase and send initial IPCP
5608
5609 // Run the plugin's against this new session.
5610 {
5611 struct param_new_session data = { &tunnel[t], &session[s] };
5612 run_plugins(PLUGIN_NEW_SESSION, &data);
5613 }
5614
5615 // Allocate TBFs if throttled
5616 if (session[s].throttle_in || session[s].throttle_out)
5617 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5618
5619 session[s].last_packet = session[s].last_data = time_now;
5620
5621 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5622 fmtaddr(htonl(session[s].ip), 0),
5623 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5624
5625 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5626
5627 return 1; // RADIUS OK and IP allocated, done...
5628 }
5629
5630 //
5631 // This session just got dropped on us by the master or something.
5632 // Make sure our tables up up to date...
5633 //
5634 int load_session(sessionidt s, sessiont *new)
5635 {
5636 int i;
5637 int newip = 0;
5638
5639 // Sanity checks.
5640 if (new->ip_pool_index >= MAXIPPOOL ||
5641 new->tunnel >= MAXTUNNEL)
5642 {
5643 LOG(0, s, 0, "Strange session update received!\n");
5644 // FIXME! What to do here?
5645 return 0;
5646 }
5647
5648 //
5649 // Ok. All sanity checks passed. Now we're committed to
5650 // loading the new session.
5651 //
5652
5653 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5654
5655 // See if routes/ip cache need updating
5656 if (new->ip != session[s].ip)
5657 newip++;
5658
5659 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5660 if (new->route[i].ip != session[s].route[i].ip ||
5661 new->route[i].prefixlen != session[s].route[i].prefixlen)
5662 newip++;
5663
5664 // needs update
5665 if (newip)
5666 {
5667 int routed = 0;
5668
5669 // remove old routes...
5670 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5671 {
5672 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5673 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5674 routed++;
5675
5676 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5677 }
5678
5679 // ...ip
5680 if (session[s].ip)
5681 {
5682 if (session[s].ip_pool_index == -1) // static IP
5683 {
5684 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5685 }
5686 else // It's part of the IP pool, remove it manually.
5687 uncache_ipmap(session[s].ip);
5688 }
5689
5690 routed = 0;
5691
5692 // add new routes...
5693 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5694 {
5695 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5696 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5697 routed++;
5698
5699 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5700 }
5701
5702 // ...ip
5703 if (new->ip)
5704 {
5705 // If there's a new one, add it.
5706 if (new->ip_pool_index == -1)
5707 {
5708 if (!routed) routeset(s, new->ip, 0, 0, 1);
5709 }
5710 else
5711 cache_ipmap(new->ip, s);
5712 }
5713 }
5714
5715 // check v6 routing
5716 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5717 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5718
5719 // check filters
5720 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5721 {
5722 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5723 new->filter_in = 0;
5724 }
5725
5726 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5727 {
5728 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5729 new->filter_out = 0;
5730 }
5731
5732 if (new->filter_in != session[s].filter_in)
5733 {
5734 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5735 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5736 }
5737
5738 if (new->filter_out != session[s].filter_out)
5739 {
5740 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5741 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5742 }
5743
5744 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5745 // for walking the sessions to forward byte counts to the master.
5746 config->cluster_highest_sessionid = s;
5747
5748 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5749
5750 // Do fixups into address pool.
5751 if (new->ip_pool_index != -1)
5752 fix_address_pool(s);
5753
5754 return 1;
5755 }
5756
5757 static void initplugins()
5758 {
5759 int i;
5760
5761 loaded_plugins = ll_init();
5762 // Initialize the plugins to nothing
5763 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5764 plugins[i] = ll_init();
5765 }
5766
5767 static void *open_plugin(char *plugin_name, int load)
5768 {
5769 char path[256] = "";
5770
5771 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5772 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5773 return dlopen(path, RTLD_NOW);
5774 }
5775
5776 // plugin callback to get a config value
5777 static void *getconfig(char *key, enum config_typet type)
5778 {
5779 int i;
5780
5781 for (i = 0; config_values[i].key; i++)
5782 {
5783 if (!strcmp(config_values[i].key, key))
5784 {
5785 if (config_values[i].type == type)
5786 return ((void *) config) + config_values[i].offset;
5787
5788 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5789 key, type, config_values[i].type);
5790
5791 return 0;
5792 }
5793 }
5794
5795 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5796 return 0;
5797 }
5798
5799 static int add_plugin(char *plugin_name)
5800 {
5801 static struct pluginfuncs funcs = {
5802 _log,
5803 _log_hex,
5804 fmtaddr,
5805 sessionbyuser,
5806 sessiontbysessionidt,
5807 sessionidtbysessiont,
5808 radiusnew,
5809 radiussend,
5810 getconfig,
5811 sessionshutdown,
5812 sessionkill,
5813 throttle_session,
5814 cluster_send_session,
5815 };
5816
5817 void *p = open_plugin(plugin_name, 1);
5818 int (*initfunc)(struct pluginfuncs *);
5819 int i;
5820
5821 if (!p)
5822 {
5823 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5824 return -1;
5825 }
5826
5827 if (ll_contains(loaded_plugins, p))
5828 {
5829 dlclose(p);
5830 return 0; // already loaded
5831 }
5832
5833 {
5834 int *v = dlsym(p, "plugin_api_version");
5835 if (!v || *v != PLUGIN_API_VERSION)
5836 {
5837 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5838 dlclose(p);
5839 return -1;
5840 }
5841 }
5842
5843 if ((initfunc = dlsym(p, "plugin_init")))
5844 {
5845 if (!initfunc(&funcs))
5846 {
5847 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5848 dlclose(p);
5849 return -1;
5850 }
5851 }
5852
5853 ll_push(loaded_plugins, p);
5854
5855 for (i = 0; i < max_plugin_functions; i++)
5856 {
5857 void *x;
5858 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5859 {
5860 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5861 ll_push(plugins[i], x);
5862 }
5863 }
5864
5865 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5866 return 1;
5867 }
5868
5869 static void run_plugin_done(void *plugin)
5870 {
5871 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5872
5873 if (donefunc)
5874 donefunc();
5875 }
5876
5877 static int remove_plugin(char *plugin_name)
5878 {
5879 void *p = open_plugin(plugin_name, 0);
5880 int loaded = 0;
5881
5882 if (!p)
5883 return -1;
5884
5885 if (ll_contains(loaded_plugins, p))
5886 {
5887 int i;
5888 for (i = 0; i < max_plugin_functions; i++)
5889 {
5890 void *x;
5891 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5892 ll_delete(plugins[i], x);
5893 }
5894
5895 ll_delete(loaded_plugins, p);
5896 run_plugin_done(p);
5897 loaded = 1;
5898 }
5899
5900 dlclose(p);
5901 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5902 return loaded;
5903 }
5904
5905 int run_plugins(int plugin_type, void *data)
5906 {
5907 int (*func)(void *data);
5908
5909 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5910 return PLUGIN_RET_ERROR;
5911
5912 ll_reset(plugins[plugin_type]);
5913 while ((func = ll_next(plugins[plugin_type])))
5914 {
5915 int r = func(data);
5916
5917 if (r != PLUGIN_RET_OK)
5918 return r; // stop here
5919 }
5920
5921 return PLUGIN_RET_OK;
5922 }
5923
5924 static void plugins_done()
5925 {
5926 void *p;
5927
5928 ll_reset(loaded_plugins);
5929 while ((p = ll_next(loaded_plugins)))
5930 run_plugin_done(p);
5931 }
5932
5933 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5934 {
5935 struct nsctl request;
5936 struct nsctl response;
5937 int type = unpack_control(&request, buf, len);
5938 int r;
5939 void *p;
5940
5941 if (log_stream && config->debug >= 4)
5942 {
5943 if (type < 0)
5944 {
5945 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5946 fmtaddr(addr->sin_addr.s_addr, 0), type);
5947 }
5948 else
5949 {
5950 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5951 dump_control(&request, log_stream);
5952 }
5953 }
5954
5955 switch (type)
5956 {
5957 case NSCTL_REQ_LOAD:
5958 if (request.argc != 1)
5959 {
5960 response.type = NSCTL_RES_ERR;
5961 response.argc = 1;
5962 response.argv[0] = "name of plugin required";
5963 }
5964 else if ((r = add_plugin(request.argv[0])) < 1)
5965 {
5966 response.type = NSCTL_RES_ERR;
5967 response.argc = 1;
5968 response.argv[0] = !r
5969 ? "plugin already loaded"
5970 : "error loading plugin";
5971 }
5972 else
5973 {
5974 response.type = NSCTL_RES_OK;
5975 response.argc = 0;
5976 }
5977
5978 break;
5979
5980 case NSCTL_REQ_UNLOAD:
5981 if (request.argc != 1)
5982 {
5983 response.type = NSCTL_RES_ERR;
5984 response.argc = 1;
5985 response.argv[0] = "name of plugin required";
5986 }
5987 else if ((r = remove_plugin(request.argv[0])) < 1)
5988 {
5989 response.type = NSCTL_RES_ERR;
5990 response.argc = 1;
5991 response.argv[0] = !r
5992 ? "plugin not loaded"
5993 : "plugin not found";
5994 }
5995 else
5996 {
5997 response.type = NSCTL_RES_OK;
5998 response.argc = 0;
5999 }
6000
6001 break;
6002
6003 case NSCTL_REQ_HELP:
6004 response.type = NSCTL_RES_OK;
6005 response.argc = 0;
6006
6007 ll_reset(loaded_plugins);
6008 while ((p = ll_next(loaded_plugins)))
6009 {
6010 char **help = dlsym(p, "plugin_control_help");
6011 while (response.argc < 0xff && help && *help)
6012 response.argv[response.argc++] = *help++;
6013 }
6014
6015 break;
6016
6017 case NSCTL_REQ_CONTROL:
6018 {
6019 struct param_control param = {
6020 config->cluster_iam_master,
6021 request.argc,
6022 request.argv,
6023 0,
6024 NULL,
6025 };
6026
6027 int r = run_plugins(PLUGIN_CONTROL, &param);
6028
6029 if (r == PLUGIN_RET_ERROR)
6030 {
6031 response.type = NSCTL_RES_ERR;
6032 response.argc = 1;
6033 response.argv[0] = param.additional
6034 ? param.additional
6035 : "error returned by plugin";
6036 }
6037 else if (r == PLUGIN_RET_NOTMASTER)
6038 {
6039 static char msg[] = "must be run on master: 000.000.000.000";
6040
6041 response.type = NSCTL_RES_ERR;
6042 response.argc = 1;
6043 if (config->cluster_master_address)
6044 {
6045 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
6046 response.argv[0] = msg;
6047 }
6048 else
6049 {
6050 response.argv[0] = "must be run on master: none elected";
6051 }
6052 }
6053 else if (!(param.response & NSCTL_RESPONSE))
6054 {
6055 response.type = NSCTL_RES_ERR;
6056 response.argc = 1;
6057 response.argv[0] = param.response
6058 ? "unrecognised response value from plugin"
6059 : "unhandled action";
6060 }
6061 else
6062 {
6063 response.type = param.response;
6064 response.argc = 0;
6065 if (param.additional)
6066 {
6067 response.argc = 1;
6068 response.argv[0] = param.additional;
6069 }
6070 }
6071 }
6072
6073 break;
6074
6075 default:
6076 response.type = NSCTL_RES_ERR;
6077 response.argc = 1;
6078 response.argv[0] = "error unpacking control packet";
6079 }
6080
6081 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
6082 if (!buf)
6083 {
6084 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6085 return;
6086 }
6087
6088 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
6089 if (r > 0)
6090 {
6091 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6092 if (log_stream && config->debug >= 4)
6093 {
6094 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6095 dump_control(&response, log_stream);
6096 }
6097 }
6098 else
6099 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6100 fmtaddr(addr->sin_addr.s_addr, 0), r);
6101
6102 free(buf);
6103 }
6104
6105 static tunnelidt new_tunnel()
6106 {
6107 tunnelidt i;
6108 for (i = 1; i < MAXTUNNEL; i++)
6109 {
6110 if ((tunnel[i].state == TUNNELFREE) && (i != TUNNEL_ID_PPPOE))
6111 {
6112 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6113 if (i > config->cluster_highest_tunnelid)
6114 config->cluster_highest_tunnelid = i;
6115 return i;
6116 }
6117 }
6118 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6119 return 0;
6120 }
6121
6122 //
6123 // We're becoming the master. Do any required setup..
6124 //
6125 // This is principally telling all the plugins that we're
6126 // now a master, and telling them about all the sessions
6127 // that are active too..
6128 //
6129 void become_master(void)
6130 {
6131 int s, i;
6132 static struct event_data d[RADIUS_FDS];
6133 struct epoll_event e;
6134
6135 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6136
6137 // running a bunch of iptables commands is slow and can cause
6138 // the master to drop tunnels on takeover--kludge around the
6139 // problem by forking for the moment (note: race)
6140 if (!fork_and_close())
6141 {
6142 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6143 {
6144 if (!session[s].opened) // Not an in-use session.
6145 continue;
6146
6147 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6148 }
6149 exit(0);
6150 }
6151
6152 // add radius fds
6153 e.events = EPOLLIN;
6154 for (i = 0; i < RADIUS_FDS; i++)
6155 {
6156 d[i].type = FD_TYPE_RADIUS;
6157 d[i].index = i;
6158 e.data.ptr = &d[i];
6159
6160 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6161 }
6162 }
6163
6164 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6165 {
6166 int s, i;
6167 int count = 0;
6168 int buckets[64];
6169
6170 if (CLI_HELP_REQUESTED)
6171 return CLI_HELP_NO_ARGS;
6172
6173 time(&time_now);
6174 for (i = 0; i < 64;++i) buckets[i] = 0;
6175
6176 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6177 {
6178 int idle;
6179 if (!session[s].opened)
6180 continue;
6181
6182 idle = time_now - session[s].last_data;
6183 idle /= 5 ; // In multiples of 5 seconds.
6184 if (idle < 0)
6185 idle = 0;
6186 if (idle > 63)
6187 idle = 63;
6188
6189 ++count;
6190 ++buckets[idle];
6191 }
6192
6193 for (i = 0; i < 63; ++i)
6194 {
6195 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6196 }
6197 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6198 cli_print(cli, "%d total sessions open.", count);
6199 return CLI_OK;
6200 }
6201
6202 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6203 {
6204 int s, i;
6205 int count = 0;
6206 int buckets[64];
6207
6208 if (CLI_HELP_REQUESTED)
6209 return CLI_HELP_NO_ARGS;
6210
6211 time(&time_now);
6212 for (i = 0; i < 64;++i) buckets[i] = 0;
6213
6214 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6215 {
6216 int open = 0, d;
6217 if (!session[s].opened)
6218 continue;
6219
6220 d = time_now - session[s].opened;
6221 if (d < 0)
6222 d = 0;
6223 while (d > 1 && open < 32)
6224 {
6225 ++open;
6226 d >>= 1; // half.
6227 }
6228 ++count;
6229 ++buckets[open];
6230 }
6231
6232 s = 1;
6233 for (i = 0; i < 30; ++i)
6234 {
6235 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6236 s <<= 1;
6237 }
6238 cli_print(cli, "%d total sessions open.", count);
6239 return CLI_OK;
6240 }
6241
6242 /* Unhide an avp.
6243 *
6244 * This unencodes the AVP using the L2TP secret and the previously
6245 * stored random vector. It overwrites the hidden data with the
6246 * unhidden AVP subformat.
6247 */
6248 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6249 {
6250 MD5_CTX ctx;
6251 uint8_t digest[16];
6252 uint8_t *last;
6253 size_t d = 0;
6254 uint16_t m = htons(type);
6255
6256 // Compute initial pad
6257 MD5_Init(&ctx);
6258 MD5_Update(&ctx, (unsigned char *) &m, 2);
6259 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6260 MD5_Update(&ctx, vector, vec_len);
6261 MD5_Final(digest, &ctx);
6262
6263 // pointer to last decoded 16 octets
6264 last = value;
6265
6266 while (len > 0)
6267 {
6268 // calculate a new pad based on the last decoded block
6269 if (d >= sizeof(digest))
6270 {
6271 MD5_Init(&ctx);
6272 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6273 MD5_Update(&ctx, last, sizeof(digest));
6274 MD5_Final(digest, &ctx);
6275
6276 d = 0;
6277 last = value;
6278 }
6279
6280 *value++ ^= digest[d++];
6281 len--;
6282 }
6283 }
6284
6285 int find_filter(char const *name, size_t len)
6286 {
6287 int free = -1;
6288 int i;
6289
6290 for (i = 0; i < MAXFILTER; i++)
6291 {
6292 if (!*ip_filters[i].name)
6293 {
6294 if (free < 0)
6295 free = i;
6296
6297 continue;
6298 }
6299
6300 if (strlen(ip_filters[i].name) != len)
6301 continue;
6302
6303 if (!strncmp(ip_filters[i].name, name, len))
6304 return i;
6305 }
6306
6307 return free;
6308 }
6309
6310 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6311 {
6312 switch (p->op)
6313 {
6314 case FILTER_PORT_OP_EQ: return port == p->port;
6315 case FILTER_PORT_OP_NEQ: return port != p->port;
6316 case FILTER_PORT_OP_GT: return port > p->port;
6317 case FILTER_PORT_OP_LT: return port < p->port;
6318 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6319 }
6320
6321 return 0;
6322 }
6323
6324 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6325 {
6326 switch (op)
6327 {
6328 case FILTER_FLAG_OP_ANY:
6329 return (flags & sflags) || (~flags & cflags);
6330
6331 case FILTER_FLAG_OP_ALL:
6332 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6333
6334 case FILTER_FLAG_OP_EST:
6335 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6336 }
6337
6338 return 0;
6339 }
6340
6341 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6342 {
6343 uint16_t frag_offset;
6344 uint8_t proto;
6345 in_addr_t src_ip;
6346 in_addr_t dst_ip;
6347 uint16_t src_port = 0;
6348 uint16_t dst_port = 0;
6349 uint8_t flags = 0;
6350 ip_filter_rulet *rule;
6351
6352 if (len < 20) // up to end of destination address
6353 return 0;
6354
6355 if ((*buf >> 4) != 4) // IPv4
6356 return 0;
6357
6358 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6359 proto = buf[9];
6360 src_ip = *(in_addr_t *) (buf + 12);
6361 dst_ip = *(in_addr_t *) (buf + 16);
6362
6363 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6364 {
6365 int l = (buf[0] & 0xf) * 4; // length of IP header
6366 if (len < l + 4) // ports
6367 return 0;
6368
6369 src_port = ntohs(*(uint16_t *) (buf + l));
6370 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6371 if (proto == IPPROTO_TCP)
6372 {
6373 if (len < l + 14) // flags
6374 return 0;
6375
6376 flags = buf[l + 13] & 0x3f;
6377 }
6378 }
6379
6380 for (rule = ip_filters[filter].rules; rule->action; rule++)
6381 {
6382 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6383 continue;
6384
6385 if (rule->src_wild != INADDR_BROADCAST &&
6386 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6387 continue;
6388
6389 if (rule->dst_wild != INADDR_BROADCAST &&
6390 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6391 continue;
6392
6393 if (frag_offset)
6394 {
6395 // layer 4 deny rules are skipped
6396 if (rule->action == FILTER_ACTION_DENY &&
6397 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6398 continue;
6399 }
6400 else
6401 {
6402 if (rule->frag)
6403 continue;
6404
6405 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6406 {
6407 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6408 continue;
6409
6410 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6411 continue;
6412
6413 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6414 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6415 continue;
6416 }
6417 }
6418
6419 // matched
6420 rule->counter++;
6421 return rule->action == FILTER_ACTION_PERMIT;
6422 }
6423
6424 // default deny
6425 return 0;
6426 }
6427
6428 #ifdef LAC
6429
6430 tunnelidt lac_new_tunnel()
6431 {
6432 return new_tunnel();
6433 }
6434
6435 void lac_tunnelclear(tunnelidt t)
6436 {
6437 tunnelclear(t);
6438 }
6439
6440 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6441 {
6442 uint16_t version = 0x0100; // protocol version
6443
6444 tunnel[t].state = TUNNELOPENING;
6445
6446 // Sent SCCRQ - Start Control Connection Request
6447 controlt *c = controlnew(1); // sending SCCRQ
6448 controls(c, 7, hostname, 1); // host name
6449 controls(c, 8, Vendor_name, 1); // Vendor name
6450 control16(c, 2, version, 1); // protocol version
6451 control32(c, 3, 3, 1); // framing Capabilities
6452 control16(c, 9, t, 1); // assigned tunnel
6453 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6454 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6455 controladd(c, 0, t); // send
6456 }
6457
6458 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6459 {
6460 // Sent ICRQ Incoming-call-request
6461 controlt *c = controlnew(10); // ICRQ
6462
6463 control16(c, 14, s, 1); // assigned sesion
6464 call_serial_number++;
6465 control32(c, 15, call_serial_number, 1); // call serial number
6466 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6467 controladd(c, 0, t); // send
6468 }
6469
6470 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6471 {
6472 tunnelshutdown(t, reason, result, error, msg);
6473 }
6474
6475 #endif