ed85a91a017d307360e68efe4f16b08bbb943f01
[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 // Globals
57 configt *config = NULL; // all configuration
58 int nlfd = -1; // netlink socket
59 int tunfd = -1; // tun interface file handle. (network device)
60 int udpfd = -1; // UDP file handle
61 int controlfd = -1; // Control signal handle
62 int clifd = -1; // Socket listening for CLI connections.
63 int daefd = -1; // Socket listening for DAE connections.
64 int snoopfd = -1; // UDP file handle for sending out intercept data
65 int *radfds = NULL; // RADIUS requests file handles
66 int rand_fd = -1; // Random data source
67 int cluster_sockfd = -1; // Intra-cluster communications socket.
68 int epollfd = -1; // event polling
69 time_t basetime = 0; // base clock
70 char hostname[MAXHOSTNAME] = ""; // us.
71 static int tunidx; // ifr_ifindex of tun device
72 int nlseqnum = 0; // netlink sequence number
73 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
74 static int syslog_log = 0; // are we logging to syslog
75 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id = 0; // Unique ID for radius accounting
77 // Guest change
78 char guest_users[10][32]; // Array of guest users
79 int guest_accounts_num = 0; // Number of guest users
80
81 // calculated from config->l2tp_mtu
82 uint16_t MRU = 0; // PPP MRU
83 uint16_t MSS = 0; // TCP MSS
84
85 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
86 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
87
88 union iphash {
89 sessionidt sess;
90 union iphash *idx;
91 } ip_hash[256]; // Mapping from IP address to session structures.
92
93 struct ipv6radix {
94 sessionidt sess;
95 struct ipv6radix *branch;
96 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
97
98 // Traffic counters.
99 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
100 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
101 uint32_t eth_tx = 0;
102
103 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
104 time_t time_now = 0; // Current time in seconds since epoch.
105 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
106 static char time_now_string[64] = {0}; // Current time as a string.
107 static int time_changed = 0; // time_now changed
108 char main_quit = 0; // True if we're in the process of exiting.
109 static char main_reload = 0; // Re-load pending
110 linked_list *loaded_plugins;
111 linked_list *plugins[MAX_PLUGIN_TYPES];
112
113 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
114 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
115
116 config_descriptt config_values[] = {
117 CONFIG("debug", debug, INT),
118 CONFIG("log_file", log_filename, STRING),
119 CONFIG("pid_file", pid_file, STRING),
120 CONFIG("random_device", random_device, STRING),
121 CONFIG("l2tp_secret", l2tp_secret, STRING),
122 CONFIG("l2tp_mtu", l2tp_mtu, INT),
123 CONFIG("ppp_restart_time", ppp_restart_time, INT),
124 CONFIG("ppp_max_configure", ppp_max_configure, INT),
125 CONFIG("ppp_max_failure", ppp_max_failure, INT),
126 CONFIG("primary_dns", default_dns1, IPv4),
127 CONFIG("secondary_dns", default_dns2, IPv4),
128 CONFIG("primary_radius", radiusserver[0], IPv4),
129 CONFIG("secondary_radius", radiusserver[1], IPv4),
130 CONFIG("primary_radius_port", radiusport[0], SHORT),
131 CONFIG("secondary_radius_port", radiusport[1], SHORT),
132 CONFIG("radius_accounting", radius_accounting, BOOL),
133 CONFIG("radius_interim", radius_interim, INT),
134 CONFIG("radius_secret", radiussecret, STRING),
135 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
136 CONFIG("radius_dae_port", radius_dae_port, SHORT),
137 CONFIG("radius_bind_min", radius_bind_min, SHORT),
138 CONFIG("radius_bind_max", radius_bind_max, SHORT),
139 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
140 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
141 CONFIG("guest_account", guest_user, STRING),
142 CONFIG("bind_address", bind_address, IPv4),
143 CONFIG("peer_address", peer_address, IPv4),
144 CONFIG("send_garp", send_garp, BOOL),
145 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
146 CONFIG("throttle_buckets", num_tbfs, INT),
147 CONFIG("accounting_dir", accounting_dir, STRING),
148 CONFIG("dump_speed", dump_speed, BOOL),
149 CONFIG("multi_read_count", multi_read_count, INT),
150 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
151 CONFIG("lock_pages", lock_pages, BOOL),
152 CONFIG("icmp_rate", icmp_rate, INT),
153 CONFIG("packet_limit", max_packets, INT),
154 CONFIG("cluster_address", cluster_address, IPv4),
155 CONFIG("cluster_interface", cluster_interface, STRING),
156 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
157 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
158 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
159 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
160 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
161 CONFIG("cli_bind_address", cli_bind_address, IPv4),
162 CONFIG("hostname", hostname, STRING),
163 CONFIG("nexthop_address", nexthop_address, IPv4),
164 CONFIG("nexthop6_address", nexthop6_address, IPv6),
165 CONFIG("echo_timeout", echo_timeout, INT),
166 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
167 { NULL, 0, 0, 0 },
168 };
169
170 static char *plugin_functions[] = {
171 NULL,
172 "plugin_pre_auth",
173 "plugin_post_auth",
174 "plugin_timer",
175 "plugin_new_session",
176 "plugin_kill_session",
177 "plugin_control",
178 "plugin_radius_response",
179 "plugin_radius_reset",
180 "plugin_radius_account",
181 "plugin_become_master",
182 "plugin_new_session_master",
183 };
184
185 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
186
187 // Counters for shutdown sessions
188 static sessiont shut_acct[8192];
189 static sessionidt shut_acct_n = 0;
190
191 tunnelt *tunnel = NULL; // Array of tunnel structures.
192 bundlet *bundle = NULL; // Array of bundle structures.
193 fragmentationt *frag = NULL; // Array of fragmentation structures.
194 sessiont *session = NULL; // Array of session structures.
195 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
196 radiust *radius = NULL; // Array of radius structures.
197 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
198 ip_filtert *ip_filters = NULL; // Array of named filters.
199 static controlt *controlfree = 0;
200 struct Tstats *_statistics = NULL;
201 #ifdef RINGBUFFER
202 struct Tringbuffer *ringbuffer = NULL;
203 #endif
204
205 static ssize_t netlink_send(struct nlmsghdr *nh);
206 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
207 static void cache_ipmap(in_addr_t ip, sessionidt s);
208 static void uncache_ipmap(in_addr_t ip);
209 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
210 static void free_ip_address(sessionidt s);
211 static void dump_acct_info(int all);
212 static void sighup_handler(int sig);
213 static void shutdown_handler(int sig);
214 static void sigchild_handler(int sig);
215 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
216 static void update_config(void);
217 static void read_config_file(void);
218 static void initplugins(void);
219 static int add_plugin(char *plugin_name);
220 static int remove_plugin(char *plugin_name);
221 static void plugins_done(void);
222 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
223 static tunnelidt new_tunnel(void);
224 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
225 static void bundleclear(bundleidt b);
226
227 // on slaves, alow BGP to withdraw cleanly before exiting
228 #define QUIT_DELAY 5
229
230 // quit actions (master)
231 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
232 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
233
234 // return internal time (10ths since process startup), set f if given
235 // as a side-effect sets time_now, and time_changed
236 static clockt now(double *f)
237 {
238 struct timeval t;
239 gettimeofday(&t, 0);
240 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
241 if (t.tv_sec != time_now)
242 {
243 time_now = t.tv_sec;
244 time_changed++;
245 }
246
247 // Time in milliseconds
248 time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
249
250 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
251 }
252
253 // work out a retry time based on try number
254 // This is a straight bounded exponential backoff.
255 // Maximum re-try time is 32 seconds. (2^5).
256 clockt backoff(uint8_t try)
257 {
258 if (try > 5) try = 5; // max backoff
259 return now(NULL) + 10 * (1 << try);
260 }
261
262
263 //
264 // Log a debug message. Typically called via the LOG macro
265 //
266 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
267 {
268 static char message[65536] = {0};
269 va_list ap;
270
271 #ifdef RINGBUFFER
272 if (ringbuffer)
273 {
274 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
275 ringbuffer->tail = 0;
276 if (ringbuffer->tail == ringbuffer->head)
277 if (++ringbuffer->head >= RINGBUFFER_SIZE)
278 ringbuffer->head = 0;
279
280 ringbuffer->buffer[ringbuffer->tail].level = level;
281 ringbuffer->buffer[ringbuffer->tail].session = s;
282 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
283 va_start(ap, format);
284 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
285 va_end(ap);
286 }
287 #endif
288
289 if (config->debug < level) return;
290
291 va_start(ap, format);
292 vsnprintf(message, sizeof(message), format, ap);
293
294 if (log_stream)
295 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
296 else if (syslog_log)
297 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
298
299 va_end(ap);
300 }
301
302 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
303 {
304 int i, j;
305 const uint8_t *d = data;
306
307 if (config->debug < level) return;
308
309 // No support for _log_hex to syslog
310 if (log_stream)
311 {
312 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
313 setvbuf(log_stream, NULL, _IOFBF, 16384);
314
315 for (i = 0; i < maxsize; )
316 {
317 fprintf(log_stream, "%4X: ", i);
318 for (j = i; j < maxsize && j < (i + 16); j++)
319 {
320 fprintf(log_stream, "%02X ", d[j]);
321 if (j == i + 7)
322 fputs(": ", log_stream);
323 }
324
325 for (; j < i + 16; j++)
326 {
327 fputs(" ", log_stream);
328 if (j == i + 7)
329 fputs(": ", log_stream);
330 }
331
332 fputs(" ", log_stream);
333 for (j = i; j < maxsize && j < (i + 16); j++)
334 {
335 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
336 fputc(d[j], log_stream);
337 else
338 fputc('.', log_stream);
339
340 if (j == i + 7)
341 fputs(" ", log_stream);
342 }
343
344 i = j;
345 fputs("\n", log_stream);
346 }
347
348 fflush(log_stream);
349 setbuf(log_stream, NULL);
350 }
351 }
352
353 // update a counter, accumulating 2^32 wraps
354 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
355 {
356 uint32_t new = *counter + delta;
357 if (new < *counter)
358 (*wrap)++;
359
360 *counter = new;
361 }
362
363 // initialise the random generator
364 static void initrandom(char *source)
365 {
366 static char path[sizeof(config->random_device)] = "*undefined*";
367
368 // reinitialise only if we are forced to do so or if the config has changed
369 if (source && !strncmp(path, source, sizeof(path)))
370 return;
371
372 // close previous source, if any
373 if (rand_fd >= 0)
374 close(rand_fd);
375
376 rand_fd = -1;
377
378 if (source)
379 {
380 // register changes
381 snprintf(path, sizeof(path), "%s", source);
382
383 if (*path == '/')
384 {
385 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
386 if (rand_fd < 0)
387 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
388 path, strerror(errno));
389 }
390 }
391 }
392
393 // fill buffer with random data
394 void random_data(uint8_t *buf, int len)
395 {
396 int n = 0;
397
398 CSTAT(random_data);
399 if (rand_fd >= 0)
400 {
401 n = read(rand_fd, buf, len);
402 if (n >= len) return;
403 if (n < 0)
404 {
405 if (errno != EAGAIN)
406 {
407 LOG(0, 0, 0, "Error reading from random source: %s\n",
408 strerror(errno));
409
410 // fall back to rand()
411 initrandom(NULL);
412 }
413
414 n = 0;
415 }
416 }
417
418 // append missing data
419 while (n < len)
420 // not using the low order bits from the prng stream
421 buf[n++] = (rand() >> 4) & 0xff;
422 }
423
424 // Add a route
425 //
426 // This adds it to the routing table, advertises it
427 // via BGP if enabled, and stuffs it into the
428 // 'sessionbyip' cache.
429 //
430 // 'ip' must be in _host_ order.
431 //
432 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
433 {
434 struct {
435 struct nlmsghdr nh;
436 struct rtmsg rt;
437 char buf[32];
438 } req;
439 int i;
440 in_addr_t n_ip;
441
442 if (!prefixlen) prefixlen = 32;
443
444 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
445
446 memset(&req, 0, sizeof(req));
447
448 if (add)
449 {
450 req.nh.nlmsg_type = RTM_NEWROUTE;
451 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
452 }
453 else
454 {
455 req.nh.nlmsg_type = RTM_DELROUTE;
456 req.nh.nlmsg_flags = NLM_F_REQUEST;
457 }
458
459 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
460
461 req.rt.rtm_family = AF_INET;
462 req.rt.rtm_dst_len = prefixlen;
463 req.rt.rtm_table = RT_TABLE_MAIN;
464 req.rt.rtm_protocol = 42;
465 req.rt.rtm_scope = RT_SCOPE_LINK;
466 req.rt.rtm_type = RTN_UNICAST;
467
468 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
469 n_ip = htonl(ip);
470 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
471 if (gw)
472 {
473 n_ip = htonl(gw);
474 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
475 }
476
477 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
478 fmtaddr(htonl(ip), 0), prefixlen,
479 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
480
481 if (netlink_send(&req.nh) < 0)
482 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
483
484 #ifdef BGP
485 if (add)
486 bgp_add_route(htonl(ip), prefixlen);
487 else
488 bgp_del_route(htonl(ip), prefixlen);
489 #endif /* BGP */
490
491 // Add/Remove the IPs to the 'sessionbyip' cache.
492 // Note that we add the zero address in the case of
493 // a network route. Roll on CIDR.
494
495 // Note that 's == 0' implies this is the address pool.
496 // We still cache it here, because it will pre-fill
497 // the malloc'ed tree.
498
499 if (s)
500 {
501 if (!add) // Are we deleting a route?
502 s = 0; // Caching the session as '0' is the same as uncaching.
503
504 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
505 cache_ipmap(i, s);
506 }
507 }
508
509 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
510 {
511 struct {
512 struct nlmsghdr nh;
513 struct rtmsg rt;
514 char buf[64];
515 } req;
516 int metric;
517 char ipv6addr[INET6_ADDRSTRLEN];
518
519 if (!config->ipv6_prefix.s6_addr[0])
520 {
521 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
522 return;
523 }
524
525 memset(&req, 0, sizeof(req));
526
527 if (add)
528 {
529 req.nh.nlmsg_type = RTM_NEWROUTE;
530 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
531 }
532 else
533 {
534 req.nh.nlmsg_type = RTM_DELROUTE;
535 req.nh.nlmsg_flags = NLM_F_REQUEST;
536 }
537
538 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
539
540 req.rt.rtm_family = AF_INET6;
541 req.rt.rtm_dst_len = prefixlen;
542 req.rt.rtm_table = RT_TABLE_MAIN;
543 req.rt.rtm_protocol = 42;
544 req.rt.rtm_scope = RT_SCOPE_LINK;
545 req.rt.rtm_type = RTN_UNICAST;
546
547 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
548 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
549 metric = 1;
550 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
551
552 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
553 add ? "add" : "del",
554 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
555 prefixlen);
556
557 if (netlink_send(&req.nh) < 0)
558 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
559
560 #ifdef BGP
561 if (add)
562 bgp_add_route6(ip, prefixlen);
563 else
564 bgp_del_route6(ip, prefixlen);
565 #endif /* BGP */
566
567 if (s)
568 {
569 if (!add) // Are we deleting a route?
570 s = 0; // Caching the session as '0' is the same as uncaching.
571
572 cache_ipv6map(ip, prefixlen, s);
573 }
574
575 return;
576 }
577
578 //
579 // Set up netlink socket
580 static void initnetlink(void)
581 {
582 struct sockaddr_nl nladdr;
583
584 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
585 if (nlfd < 0)
586 {
587 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
588 exit(1);
589 }
590
591 memset(&nladdr, 0, sizeof(nladdr));
592 nladdr.nl_family = AF_NETLINK;
593 nladdr.nl_pid = getpid();
594
595 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
596 {
597 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
598 exit(1);
599 }
600 }
601
602 static ssize_t netlink_send(struct nlmsghdr *nh)
603 {
604 struct sockaddr_nl nladdr;
605 struct iovec iov;
606 struct msghdr msg;
607
608 nh->nlmsg_pid = getpid();
609 nh->nlmsg_seq = ++nlseqnum;
610
611 // set kernel address
612 memset(&nladdr, 0, sizeof(nladdr));
613 nladdr.nl_family = AF_NETLINK;
614
615 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
616 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
617
618 return sendmsg(nlfd, &msg, 0);
619 }
620
621 static ssize_t netlink_recv(void *buf, ssize_t len)
622 {
623 struct sockaddr_nl nladdr;
624 struct iovec iov;
625 struct msghdr msg;
626
627 // set kernel address
628 memset(&nladdr, 0, sizeof(nladdr));
629 nladdr.nl_family = AF_NETLINK;
630
631 iov = (struct iovec){ buf, len };
632 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
633
634 return recvmsg(nlfd, &msg, 0);
635 }
636
637 /* adapted from iproute2 */
638 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
639 {
640 int len = RTA_LENGTH(alen);
641 struct rtattr *rta;
642
643 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
644 rta->rta_type = type;
645 rta->rta_len = len;
646 memcpy(RTA_DATA(rta), data, alen);
647 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
648 }
649
650 // messages corresponding to different phases seq number
651 static char *tun_nl_phase_msg[] = {
652 "initialized",
653 "getting tun interface index",
654 "setting tun interface parameters",
655 "setting tun IPv4 address",
656 "setting tun LL IPv6 address",
657 "setting tun global IPv6 address",
658 };
659
660 //
661 // Set up TUN interface
662 static void inittun(void)
663 {
664 struct ifreq ifr;
665
666 memset(&ifr, 0, sizeof(ifr));
667 ifr.ifr_flags = IFF_TUN;
668
669 tunfd = open(TUNDEVICE, O_RDWR);
670 if (tunfd < 0)
671 { // fatal
672 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
673 exit(1);
674 }
675 {
676 int flags = fcntl(tunfd, F_GETFL, 0);
677 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
678 }
679 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
680 {
681 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
682 exit(1);
683 }
684 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
685 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
686
687 tunidx = if_nametoindex(config->tundevice);
688 if (tunidx == 0)
689 {
690 LOG(0, 0, 0, "Can't get tun interface index\n");
691 exit(1);
692 }
693
694 {
695 struct {
696 // interface setting
697 struct nlmsghdr nh;
698 union {
699 struct ifinfomsg ifinfo;
700 struct ifaddrmsg ifaddr;
701 } ifmsg;
702 char rtdata[32]; // 32 should be enough
703 } req;
704 uint32_t txqlen, mtu;
705 in_addr_t ip;
706
707 memset(&req, 0, sizeof(req));
708
709 req.nh.nlmsg_type = RTM_NEWLINK;
710 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
711 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
712
713 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
714 req.ifmsg.ifinfo.ifi_index = tunidx;
715 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
716 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
717
718 /* Bump up the qlen to deal with bursts from the network */
719 txqlen = 1000;
720 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
721 /* set MTU to modem MRU */
722 mtu = MRU;
723 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
724
725 if (netlink_send(&req.nh) < 0)
726 goto senderror;
727
728 memset(&req, 0, sizeof(req));
729
730 req.nh.nlmsg_type = RTM_NEWADDR;
731 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
732 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
733
734 req.ifmsg.ifaddr.ifa_family = AF_INET;
735 req.ifmsg.ifaddr.ifa_prefixlen = 32;
736 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
737 req.ifmsg.ifaddr.ifa_index = tunidx;
738
739 if (config->bind_address)
740 ip = config->bind_address;
741 else
742 ip = 0x01010101; // 1.1.1.1
743 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
744
745 if (netlink_send(&req.nh) < 0)
746 goto senderror;
747
748 // Only setup IPv6 on the tun device if we have a configured prefix
749 if (config->ipv6_prefix.s6_addr[0]) {
750 struct in6_addr ip6;
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_INET6;
759 req.ifmsg.ifaddr.ifa_prefixlen = 64;
760 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
761 req.ifmsg.ifaddr.ifa_index = tunidx;
762
763 // Link local address is FE80::1
764 memset(&ip6, 0, sizeof(ip6));
765 ip6.s6_addr[0] = 0xFE;
766 ip6.s6_addr[1] = 0x80;
767 ip6.s6_addr[15] = 1;
768 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
769
770 if (netlink_send(&req.nh) < 0)
771 goto senderror;
772
773 memset(&req, 0, sizeof(req));
774
775 req.nh.nlmsg_type = RTM_NEWADDR;
776 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
777 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
778
779 req.ifmsg.ifaddr.ifa_family = AF_INET6;
780 req.ifmsg.ifaddr.ifa_prefixlen = 64;
781 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
782 req.ifmsg.ifaddr.ifa_index = tunidx;
783
784 // Global address is prefix::1
785 ip6 = config->ipv6_prefix;
786 ip6.s6_addr[15] = 1;
787 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
788
789 if (netlink_send(&req.nh) < 0)
790 goto senderror;
791 }
792
793 memset(&req, 0, sizeof(req));
794
795 req.nh.nlmsg_type = NLMSG_DONE;
796 req.nh.nlmsg_len = NLMSG_LENGTH(0);
797
798 if (netlink_send(&req.nh) < 0)
799 goto senderror;
800
801 // if we get an error for seqnum < min_initok_nlseqnum,
802 // we must exit as initialization went wrong
803 if (config->ipv6_prefix.s6_addr[0])
804 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
805 else
806 min_initok_nlseqnum = 3 + 1; // idx + if + addr
807 }
808
809 return;
810
811 senderror:
812 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
813 exit(1);
814 }
815
816 // set up UDP ports
817 static void initudp(void)
818 {
819 int on = 1;
820 struct sockaddr_in addr;
821
822 // Tunnel
823 memset(&addr, 0, sizeof(addr));
824 addr.sin_family = AF_INET;
825 addr.sin_port = htons(L2TPPORT);
826 addr.sin_addr.s_addr = config->bind_address;
827 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
828 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
829 {
830 int flags = fcntl(udpfd, F_GETFL, 0);
831 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
832 }
833 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
834 {
835 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
836 exit(1);
837 }
838
839 // Control
840 memset(&addr, 0, sizeof(addr));
841 addr.sin_family = AF_INET;
842 addr.sin_port = htons(NSCTL_PORT);
843 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
844 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
845 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
846 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
847 {
848 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
849 exit(1);
850 }
851
852 // Dynamic Authorization Extensions to RADIUS
853 memset(&addr, 0, sizeof(addr));
854 addr.sin_family = AF_INET;
855 addr.sin_port = htons(config->radius_dae_port);
856 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
857 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
858 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
859 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
860 {
861 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
862 exit(1);
863 }
864
865 // Intercept
866 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
867 }
868
869 //
870 // Find session by IP, < 1 for not found
871 //
872 // Confusingly enough, this 'ip' must be
873 // in _network_ order. This being the common
874 // case when looking it up from IP packet headers.
875 //
876 // We actually use this cache for two things.
877 // #1. For used IP addresses, this maps to the
878 // session ID that it's used by.
879 // #2. For un-used IP addresses, this maps to the
880 // index into the pool table that contains that
881 // IP address.
882 //
883
884 static sessionidt lookup_ipmap(in_addr_t ip)
885 {
886 uint8_t *a = (uint8_t *) &ip;
887 union iphash *h = ip_hash;
888
889 if (!(h = h[*a++].idx)) return 0;
890 if (!(h = h[*a++].idx)) return 0;
891 if (!(h = h[*a++].idx)) return 0;
892
893 return h[*a].sess;
894 }
895
896 static sessionidt lookup_ipv6map(struct in6_addr ip)
897 {
898 struct ipv6radix *curnode;
899 int i;
900 int s;
901 char ipv6addr[INET6_ADDRSTRLEN];
902
903 curnode = &ipv6_hash[ip.s6_addr[0]];
904 i = 1;
905 s = curnode->sess;
906
907 while (s == 0 && i < 15 && curnode->branch != NULL)
908 {
909 curnode = &curnode->branch[ip.s6_addr[i]];
910 s = curnode->sess;
911 i++;
912 }
913
914 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
915 inet_ntop(AF_INET6, &ip, ipv6addr,
916 INET6_ADDRSTRLEN),
917 s);
918
919 return s;
920 }
921
922 sessionidt sessionbyip(in_addr_t ip)
923 {
924 sessionidt s = lookup_ipmap(ip);
925 CSTAT(sessionbyip);
926
927 if (s > 0 && s < MAXSESSION && session[s].opened)
928 return s;
929
930 return 0;
931 }
932
933 sessionidt sessionbyipv6(struct in6_addr ip)
934 {
935 sessionidt s;
936 CSTAT(sessionbyipv6);
937
938 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
939 (ip.s6_addr[0] == 0xFE &&
940 ip.s6_addr[1] == 0x80 &&
941 ip.s6_addr16[1] == 0 &&
942 ip.s6_addr16[2] == 0 &&
943 ip.s6_addr16[3] == 0)) {
944 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
945 } else {
946 s = lookup_ipv6map(ip);
947 }
948
949 if (s > 0 && s < MAXSESSION && session[s].opened)
950 return s;
951
952 return 0;
953 }
954
955 //
956 // Take an IP address in HOST byte order and
957 // add it to the sessionid by IP cache.
958 //
959 // (It's actually cached in network order)
960 //
961 static void cache_ipmap(in_addr_t ip, sessionidt s)
962 {
963 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
964 uint8_t *a = (uint8_t *) &nip;
965 union iphash *h = ip_hash;
966 int i;
967
968 for (i = 0; i < 3; i++)
969 {
970 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
971 return;
972
973 h = h[a[i]].idx;
974 }
975
976 h[a[3]].sess = s;
977
978 if (s > 0)
979 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
980
981 else if (s == 0)
982 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
983 // else a map to an ip pool index.
984 }
985
986 static void uncache_ipmap(in_addr_t ip)
987 {
988 cache_ipmap(ip, 0); // Assign it to the NULL session.
989 }
990
991 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
992 {
993 int i;
994 int bytes;
995 struct ipv6radix *curnode;
996 char ipv6addr[INET6_ADDRSTRLEN];
997
998 curnode = &ipv6_hash[ip.s6_addr[0]];
999
1000 bytes = prefixlen >> 3;
1001 i = 1;
1002 while (i < bytes) {
1003 if (curnode->branch == NULL)
1004 {
1005 if (!(curnode->branch = calloc(256,
1006 sizeof (struct ipv6radix))))
1007 return;
1008 }
1009 curnode = &curnode->branch[ip.s6_addr[i]];
1010 i++;
1011 }
1012
1013 curnode->sess = s;
1014
1015 if (s > 0)
1016 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1017 inet_ntop(AF_INET6, &ip, ipv6addr,
1018 INET6_ADDRSTRLEN),
1019 prefixlen);
1020 else if (s == 0)
1021 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1022 inet_ntop(AF_INET6, &ip, ipv6addr,
1023 INET6_ADDRSTRLEN),
1024 prefixlen);
1025 }
1026
1027 //
1028 // CLI list to dump current ipcache.
1029 //
1030 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1031 {
1032 union iphash *d = ip_hash, *e, *f, *g;
1033 int i, j, k, l;
1034 int count = 0;
1035
1036 if (CLI_HELP_REQUESTED)
1037 return CLI_HELP_NO_ARGS;
1038
1039 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1040
1041 for (i = 0; i < 256; ++i)
1042 {
1043 if (!d[i].idx)
1044 continue;
1045
1046 e = d[i].idx;
1047 for (j = 0; j < 256; ++j)
1048 {
1049 if (!e[j].idx)
1050 continue;
1051
1052 f = e[j].idx;
1053 for (k = 0; k < 256; ++k)
1054 {
1055 if (!f[k].idx)
1056 continue;
1057
1058 g = f[k].idx;
1059 for (l = 0; l < 256; ++l)
1060 {
1061 if (!g[l].sess)
1062 continue;
1063
1064 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1065 ++count;
1066 }
1067 }
1068 }
1069 }
1070 cli_print(cli, "%d entries in cache", count);
1071 return CLI_OK;
1072 }
1073
1074
1075 // Find session by username, 0 for not found
1076 // walled garden users aren't authenticated, so the username is
1077 // reasonably useless. Ignore them to avoid incorrect actions
1078 //
1079 // This is VERY inefficent. Don't call it often. :)
1080 //
1081 sessionidt sessionbyuser(char *username)
1082 {
1083 int s;
1084 CSTAT(sessionbyuser);
1085
1086 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1087 {
1088 if (!session[s].opened)
1089 continue;
1090
1091 if (session[s].walled_garden)
1092 continue; // Skip walled garden users.
1093
1094 if (!strncmp(session[s].user, username, 128))
1095 return s;
1096
1097 }
1098 return 0; // Not found.
1099 }
1100
1101 void send_garp(in_addr_t ip)
1102 {
1103 int s;
1104 struct ifreq ifr;
1105 uint8_t mac[6];
1106
1107 s = socket(PF_INET, SOCK_DGRAM, 0);
1108 if (s < 0)
1109 {
1110 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1111 return;
1112 }
1113 memset(&ifr, 0, sizeof(ifr));
1114 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1115 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1116 {
1117 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1118 close(s);
1119 return;
1120 }
1121 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1122 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1123 {
1124 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1125 close(s);
1126 return;
1127 }
1128 close(s);
1129 sendarp(ifr.ifr_ifindex, mac, ip);
1130 }
1131
1132 static sessiont *sessiontbysessionidt(sessionidt s)
1133 {
1134 if (!s || s >= MAXSESSION) return NULL;
1135 return &session[s];
1136 }
1137
1138 static sessionidt sessionidtbysessiont(sessiont *s)
1139 {
1140 sessionidt val = s-session;
1141 if (s < session || val >= MAXSESSION) return 0;
1142 return val;
1143 }
1144
1145 // actually send a control message for a specific tunnel
1146 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1147 {
1148 struct sockaddr_in addr;
1149
1150 CSTAT(tunnelsend);
1151
1152 if (!t)
1153 {
1154 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1155 STAT(tunnel_tx_errors);
1156 return;
1157 }
1158
1159 if (!tunnel[t].ip)
1160 {
1161 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1162 STAT(tunnel_tx_errors);
1163 return;
1164 }
1165
1166 memset(&addr, 0, sizeof(addr));
1167 addr.sin_family = AF_INET;
1168 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1169 addr.sin_port = htons(tunnel[t].port);
1170
1171 // sequence expected, if sequence in message
1172 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1173
1174 // If this is a control message, deal with retries
1175 if (*buf & 0x80)
1176 {
1177 tunnel[t].last = time_now; // control message sent
1178 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1179 if (tunnel[t].try)
1180 {
1181 STAT(tunnel_retries);
1182 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1183 }
1184 }
1185
1186 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1187 {
1188 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1189 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1190 STAT(tunnel_tx_errors);
1191 return;
1192 }
1193
1194 LOG_HEX(5, "Send Tunnel Data", buf, l);
1195 STAT(tunnel_tx_packets);
1196 INC_STAT(tunnel_tx_bytes, l);
1197 }
1198
1199 //
1200 // Tiny helper function to write data to
1201 // the 'tun' device.
1202 //
1203 int tun_write(uint8_t * data, int size)
1204 {
1205 return write(tunfd, data, size);
1206 }
1207
1208 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1209 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1210 {
1211 int d = (tcp[12] >> 4) * 4;
1212 uint8_t *mss = 0;
1213 uint8_t *opts;
1214 uint8_t *data;
1215 uint16_t orig;
1216 uint32_t sum;
1217
1218 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1219 return;
1220
1221 if (tcp + d > buf + len) // short?
1222 return;
1223
1224 opts = tcp + 20;
1225 data = tcp + d;
1226
1227 while (opts < data)
1228 {
1229 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1230 {
1231 mss = opts + 2;
1232 if (mss + 2 > data) return; // short?
1233 break;
1234 }
1235
1236 if (*opts == 0) return; // end of options
1237 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1238 opts++;
1239 else
1240 opts += opts[1]; // skip over option
1241 }
1242
1243 if (!mss) return; // not found
1244 orig = ntohs(*(uint16_t *) mss);
1245
1246 if (orig <= MSS) return; // mss OK
1247
1248 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1249 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1250 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1251 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1252
1253 // set mss
1254 *(int16_t *) mss = htons(MSS);
1255
1256 // adjust checksum (see rfc1141)
1257 sum = orig + (~MSS & 0xffff);
1258 sum += ntohs(*(uint16_t *) (tcp + 16));
1259 sum = (sum & 0xffff) + (sum >> 16);
1260 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1261 }
1262
1263 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1264 {
1265 uint16_t proto;
1266 if (extra) {
1267 // Skip the four extra bytes
1268 p += 4;
1269 l -= 4;
1270 }
1271
1272 if (*p & 1)
1273 {
1274 proto = *p++;
1275 l--;
1276 }
1277 else
1278 {
1279 proto = ntohs(*(uint16_t *) p);
1280 p += 2;
1281 l -= 2;
1282 }
1283 if (proto == PPPIP)
1284 {
1285 if (session[s].die)
1286 {
1287 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1288 return; // closing session, PPP not processed
1289 }
1290 session[s].last_packet = session[s].last_data = time_now;
1291 processipin(s, t, p, l);
1292 }
1293 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1294 {
1295 if (session[s].die)
1296 {
1297 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1298 return; // closing session, PPP not processed
1299 }
1300
1301 session[s].last_packet = session[s].last_data = time_now;
1302 processipv6in(s, t, p, l);
1303 }
1304 else if (proto == PPPIPCP)
1305 {
1306 session[s].last_packet = session[s].last_data = time_now;
1307 processipcp(s, t, p, l);
1308 }
1309 else if (proto == PPPCCP)
1310 {
1311 session[s].last_packet = session[s].last_data = time_now;
1312 processccp(s, t, p, l);
1313 }
1314 else
1315 {
1316 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1317 }
1318 }
1319
1320 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1321 {
1322 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1323 sp->cout_delta += len;
1324 sp->pout++;
1325 sp->last_data = time_now;
1326
1327 sess_local[s].cout += len; // To send to master..
1328 sess_local[s].pout++;
1329 }
1330
1331 // process outgoing (to tunnel) IP
1332 //
1333 // (i.e. this routine writes to data[-8]).
1334 void processipout(uint8_t *buf, int len)
1335 {
1336 sessionidt s;
1337 sessiont *sp;
1338 tunnelidt t;
1339 in_addr_t ip;
1340
1341 uint8_t *data = buf; // Keep a copy of the originals.
1342 int size = len;
1343
1344 uint8_t fragbuf[MAXETHER + 20];
1345
1346 CSTAT(processipout);
1347
1348 if (len < MIN_IP_SIZE)
1349 {
1350 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1351 STAT(tun_rx_errors);
1352 return;
1353 }
1354 if (len >= MAXETHER)
1355 {
1356 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1357 STAT(tun_rx_errors);
1358 return;
1359 }
1360
1361 // Skip the tun header
1362 buf += 4;
1363 len -= 4;
1364
1365 // Got an IP header now
1366 if (*(uint8_t *)(buf) >> 4 != 4)
1367 {
1368 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1369 return;
1370 }
1371
1372 ip = *(uint32_t *)(buf + 16);
1373 if (!(s = sessionbyip(ip)))
1374 {
1375 // Is this a packet for a session that doesn't exist?
1376 static int rate = 0; // Number of ICMP packets we've sent this second.
1377 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1378
1379 if (last != time_now)
1380 {
1381 last = time_now;
1382 rate = 0;
1383 }
1384
1385 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1386 {
1387 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1388 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1389 config->bind_address ? config->bind_address : my_address, buf, len);
1390 }
1391 return;
1392 }
1393
1394 t = session[s].tunnel;
1395 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1396 {
1397 LOG(3, s, t, "Packet size more than session MRU\n");
1398 return;
1399 }
1400
1401 sp = &session[s];
1402
1403 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1404 if (config->max_packets > 0)
1405 {
1406 if (sess_local[s].last_packet_out == TIME)
1407 {
1408 int max = config->max_packets;
1409
1410 // All packets for throttled sessions are handled by the
1411 // master, so further limit by using the throttle rate.
1412 // A bit of a kludge, since throttle rate is in kbps,
1413 // but should still be generous given our average DSL
1414 // packet size is 200 bytes: a limit of 28kbps equates
1415 // to around 180 packets per second.
1416 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1417 max = sp->throttle_out;
1418
1419 if (++sess_local[s].packets_out > max)
1420 {
1421 sess_local[s].packets_dropped++;
1422 return;
1423 }
1424 }
1425 else
1426 {
1427 if (sess_local[s].packets_dropped)
1428 {
1429 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1430 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1431 sess_local[s].packets_dropped, sess_local[s].packets_out,
1432 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1433 sp->user);
1434 }
1435
1436 sess_local[s].last_packet_out = TIME;
1437 sess_local[s].packets_out = 1;
1438 sess_local[s].packets_dropped = 0;
1439 }
1440 }
1441
1442 // run access-list if any
1443 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1444 return;
1445
1446 // adjust MSS on SYN and SYN,ACK packets with options
1447 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1448 {
1449 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1450 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1451 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1452 }
1453
1454 if (sp->tbf_out)
1455 {
1456 // Are we throttling this session?
1457 if (config->cluster_iam_master)
1458 tbf_queue_packet(sp->tbf_out, data, size);
1459 else
1460 master_throttle_packet(sp->tbf_out, data, size);
1461 return;
1462 }
1463
1464 if (sp->walled_garden && !config->cluster_iam_master)
1465 {
1466 // We are walled-gardening this
1467 master_garden_packet(s, data, size);
1468 return;
1469 }
1470
1471 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1472 {
1473
1474 if (!config->cluster_iam_master)
1475 {
1476 // The MPPP packets must be managed by the Master.
1477 master_forward_mppp_packet(s, data, size);
1478 return;
1479 }
1480
1481 // Add on L2TP header
1482 sessionidt members[MAXBUNDLESES];
1483 bundleidt bid = session[s].bundle;
1484 bundlet *b = &bundle[bid];
1485 uint32_t num_of_links, nb_opened;
1486 int i;
1487
1488 num_of_links = b->num_of_links;
1489 nb_opened = 0;
1490 for (i = 0;i < num_of_links;i++)
1491 {
1492 s = b->members[i];
1493 if (session[s].ppp.lcp == Opened)
1494 {
1495 members[nb_opened] = s;
1496 nb_opened++;
1497 }
1498 }
1499
1500 if (nb_opened < 1)
1501 {
1502 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1503 return;
1504 }
1505
1506 num_of_links = nb_opened;
1507 b->current_ses = (b->current_ses + 1) % num_of_links;
1508 s = members[b->current_ses];
1509 t = session[s].tunnel;
1510 sp = &session[s];
1511 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1512
1513 if (num_of_links > 1)
1514 {
1515 if(len > MINFRAGLEN)
1516 {
1517 //for rotate traffic among the member links
1518 uint32_t divisor = num_of_links;
1519 if (divisor > 2)
1520 divisor = divisor/2 + (divisor & 1);
1521
1522 // Partition the packet to "num_of_links" fragments
1523 uint32_t fraglen = len / divisor;
1524 uint32_t last_fraglen = fraglen + len % divisor;
1525 uint32_t remain = len;
1526
1527 // send the first packet
1528 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1529 if (!p) return;
1530 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1531
1532 // statistics
1533 update_session_out_stat(s, sp, fraglen);
1534
1535 remain -= fraglen;
1536 while (remain > last_fraglen)
1537 {
1538 b->current_ses = (b->current_ses + 1) % num_of_links;
1539 s = members[b->current_ses];
1540 t = session[s].tunnel;
1541 sp = &session[s];
1542 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1543 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1544 if (!p) return;
1545 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1546 update_session_out_stat(s, sp, fraglen);
1547 remain -= fraglen;
1548 }
1549 // send the last fragment
1550 b->current_ses = (b->current_ses + 1) % num_of_links;
1551 s = members[b->current_ses];
1552 t = session[s].tunnel;
1553 sp = &session[s];
1554 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1555 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1556 if (!p) return;
1557 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1558 update_session_out_stat(s, sp, remain);
1559 if (remain != last_fraglen)
1560 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1561 }
1562 else
1563 {
1564 // Send it as one frame
1565 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1566 if (!p) return;
1567 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1568 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1569 update_session_out_stat(s, sp, len);
1570 }
1571 }
1572 else
1573 {
1574 // Send it as one frame (NO MPPP Frame)
1575 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1576 if (!p) return;
1577 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1578 update_session_out_stat(s, sp, len);
1579 }
1580 }
1581 else
1582 {
1583 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1584 if (!p) return;
1585 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1586 update_session_out_stat(s, sp, len);
1587 }
1588
1589 // Snooping this session, send it to intercept box
1590 if (sp->snoop_ip && sp->snoop_port)
1591 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1592
1593 udp_tx += len;
1594 }
1595
1596 // process outgoing (to tunnel) IPv6
1597 //
1598 static void processipv6out(uint8_t * buf, int len)
1599 {
1600 sessionidt s;
1601 sessiont *sp;
1602 tunnelidt t;
1603 in_addr_t ip;
1604 struct in6_addr ip6;
1605
1606 uint8_t *data = buf; // Keep a copy of the originals.
1607 int size = len;
1608
1609 uint8_t b[MAXETHER + 20];
1610
1611 CSTAT(processipv6out);
1612
1613 if (len < MIN_IP_SIZE)
1614 {
1615 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1616 STAT(tunnel_tx_errors);
1617 return;
1618 }
1619 if (len >= MAXETHER)
1620 {
1621 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1622 STAT(tunnel_tx_errors);
1623 return;
1624 }
1625
1626 // Skip the tun header
1627 buf += 4;
1628 len -= 4;
1629
1630 // Got an IP header now
1631 if (*(uint8_t *)(buf) >> 4 != 6)
1632 {
1633 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1634 return;
1635 }
1636
1637 ip6 = *(struct in6_addr *)(buf+24);
1638 s = sessionbyipv6(ip6);
1639
1640 if (s == 0)
1641 {
1642 ip = *(uint32_t *)(buf + 32);
1643 s = sessionbyip(ip);
1644 }
1645
1646 if (s == 0)
1647 {
1648 // Is this a packet for a session that doesn't exist?
1649 static int rate = 0; // Number of ICMP packets we've sent this second.
1650 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1651
1652 if (last != time_now)
1653 {
1654 last = time_now;
1655 rate = 0;
1656 }
1657
1658 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1659 {
1660 // FIXME: Should send icmp6 host unreachable
1661 }
1662 return;
1663 }
1664 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1665 {
1666 bundleidt bid = session[s].bundle;
1667 bundlet *b = &bundle[bid];
1668
1669 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1670 s = b->members[b->current_ses];
1671 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1672 }
1673 t = session[s].tunnel;
1674 sp = &session[s];
1675 sp->last_data = time_now;
1676
1677 // FIXME: add DoS prevention/filters?
1678
1679 if (sp->tbf_out)
1680 {
1681 // Are we throttling this session?
1682 if (config->cluster_iam_master)
1683 tbf_queue_packet(sp->tbf_out, data, size);
1684 else
1685 master_throttle_packet(sp->tbf_out, data, size);
1686 return;
1687 }
1688 else if (sp->walled_garden && !config->cluster_iam_master)
1689 {
1690 // We are walled-gardening this
1691 master_garden_packet(s, data, size);
1692 return;
1693 }
1694
1695 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1696
1697 // Add on L2TP header
1698 {
1699 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1700 if (!p) return;
1701 tunnelsend(b, len + (p-b), t); // send it...
1702 }
1703
1704 // Snooping this session, send it to intercept box
1705 if (sp->snoop_ip && sp->snoop_port)
1706 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1707
1708 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1709 sp->cout_delta += len;
1710 sp->pout++;
1711 udp_tx += len;
1712
1713 sess_local[s].cout += len; // To send to master..
1714 sess_local[s].pout++;
1715 }
1716
1717 //
1718 // Helper routine for the TBF filters.
1719 // Used to send queued data in to the user!
1720 //
1721 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1722 {
1723 sessiont *sp;
1724 tunnelidt t;
1725
1726 uint8_t b[MAXETHER + 20];
1727
1728 if (len < 0 || len > MAXETHER)
1729 {
1730 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1731 return;
1732 }
1733
1734 // Skip the tun header
1735 buf += 4;
1736 len -= 4;
1737
1738 if (!session[s].ip)
1739 return;
1740
1741 t = session[s].tunnel;
1742 sp = &session[s];
1743
1744 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1745
1746 // Add on L2TP header
1747 {
1748 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1749 if (!p) return;
1750 tunnelsend(b, len + (p-b), t); // send it...
1751 }
1752
1753 // Snooping this session.
1754 if (sp->snoop_ip && sp->snoop_port)
1755 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1756
1757 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1758 sp->cout_delta += len;
1759 sp->pout++;
1760 udp_tx += len;
1761
1762 sess_local[s].cout += len; // To send to master..
1763 sess_local[s].pout++;
1764 }
1765
1766 // add an AVP (16 bit)
1767 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1768 {
1769 uint16_t l = (m ? 0x8008 : 0x0008);
1770 c->buf16[c->length/2 + 0] = htons(l);
1771 c->buf16[c->length/2 + 1] = htons(0);
1772 c->buf16[c->length/2 + 2] = htons(avp);
1773 c->buf16[c->length/2 + 3] = htons(val);
1774 c->length += 8;
1775 }
1776
1777 // add an AVP (32 bit)
1778 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1779 {
1780 uint16_t l = (m ? 0x800A : 0x000A);
1781 c->buf16[c->length/2 + 0] = htons(l);
1782 c->buf16[c->length/2 + 1] = htons(0);
1783 c->buf16[c->length/2 + 2] = htons(avp);
1784 *(uint32_t *) &c->buf[c->length + 6] = htonl(val);
1785 c->length += 10;
1786 }
1787
1788 // add an AVP (string)
1789 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1790 {
1791 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1792 c->buf16[c->length/2 + 0] = htons(l);
1793 c->buf16[c->length/2 + 1] = htons(0);
1794 c->buf16[c->length/2 + 2] = htons(avp);
1795 memcpy(&c->buf[c->length + 6], val, strlen(val));
1796 c->length += 6 + strlen(val);
1797 }
1798
1799 // add a binary AVP
1800 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1801 {
1802 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1803 c->buf16[c->length/2 + 0] = htons(l);
1804 c->buf16[c->length/2 + 1] = htons(0);
1805 c->buf16[c->length/2 + 2] = htons(avp);
1806 memcpy(&c->buf[c->length + 6], val, len);
1807 c->length += 6 + len;
1808 }
1809
1810 // new control connection
1811 static controlt *controlnew(uint16_t mtype)
1812 {
1813 controlt *c;
1814 if (!controlfree)
1815 c = malloc(sizeof(controlt));
1816 else
1817 {
1818 c = controlfree;
1819 controlfree = c->next;
1820 }
1821 assert(c);
1822 c->next = 0;
1823 c->buf16[0] = htons(0xC802); // flags/ver
1824 c->length = 12;
1825 control16(c, 0, mtype, 1);
1826 return c;
1827 }
1828
1829 // send zero block if nothing is waiting
1830 // (ZLB send).
1831 static void controlnull(tunnelidt t)
1832 {
1833 uint16_t buf[6];
1834 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1835 return;
1836
1837 buf[0] = htons(0xC802); // flags/ver
1838 buf[1] = htons(12); // length
1839 buf[2] = htons(tunnel[t].far); // tunnel
1840 buf[3] = htons(0); // session
1841 buf[4] = htons(tunnel[t].ns); // sequence
1842 buf[5] = htons(tunnel[t].nr); // sequence
1843 tunnelsend((uint8_t *)buf, 12, t);
1844 }
1845
1846 // add a control message to a tunnel, and send if within window
1847 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1848 {
1849 c->buf16[1] = htons(c->length); // length
1850 c->buf16[2] = htons(tunnel[t].far); // tunnel
1851 c->buf16[3] = htons(far); // session
1852 c->buf16[4] = htons(tunnel[t].ns); // sequence
1853 tunnel[t].ns++; // advance sequence
1854 // link in message in to queue
1855 if (tunnel[t].controlc)
1856 tunnel[t].controle->next = c;
1857 else
1858 tunnel[t].controls = c;
1859
1860 tunnel[t].controle = c;
1861 tunnel[t].controlc++;
1862
1863 // send now if space in window
1864 if (tunnel[t].controlc <= tunnel[t].window)
1865 {
1866 tunnel[t].try = 0; // first send
1867 tunnelsend(c->buf, c->length, t);
1868 }
1869 }
1870
1871 //
1872 // Throttle or Unthrottle a session
1873 //
1874 // Throttle the data from/to through a session to no more than
1875 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1876 // user).
1877 //
1878 // If either value is -1, the current value is retained for that
1879 // direction.
1880 //
1881 void throttle_session(sessionidt s, int rate_in, int rate_out)
1882 {
1883 if (!session[s].opened)
1884 return; // No-one home.
1885
1886 if (!*session[s].user)
1887 return; // User not logged in
1888
1889 if (rate_in >= 0)
1890 {
1891 int bytes = rate_in * 1024 / 8; // kbits to bytes
1892 if (session[s].tbf_in)
1893 free_tbf(session[s].tbf_in);
1894
1895 if (rate_in > 0)
1896 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1897 else
1898 session[s].tbf_in = 0;
1899
1900 session[s].throttle_in = rate_in;
1901 }
1902
1903 if (rate_out >= 0)
1904 {
1905 int bytes = rate_out * 1024 / 8;
1906 if (session[s].tbf_out)
1907 free_tbf(session[s].tbf_out);
1908
1909 if (rate_out > 0)
1910 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1911 else
1912 session[s].tbf_out = 0;
1913
1914 session[s].throttle_out = rate_out;
1915 }
1916 }
1917
1918 // add/remove filters from session (-1 = no change)
1919 void filter_session(sessionidt s, int filter_in, int filter_out)
1920 {
1921 if (!session[s].opened)
1922 return; // No-one home.
1923
1924 if (!*session[s].user)
1925 return; // User not logged in
1926
1927 // paranoia
1928 if (filter_in > MAXFILTER) filter_in = -1;
1929 if (filter_out > MAXFILTER) filter_out = -1;
1930 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1931 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1932
1933 if (filter_in >= 0)
1934 {
1935 if (session[s].filter_in)
1936 ip_filters[session[s].filter_in - 1].used--;
1937
1938 if (filter_in > 0)
1939 ip_filters[filter_in - 1].used++;
1940
1941 session[s].filter_in = filter_in;
1942 }
1943
1944 if (filter_out >= 0)
1945 {
1946 if (session[s].filter_out)
1947 ip_filters[session[s].filter_out - 1].used--;
1948
1949 if (filter_out > 0)
1950 ip_filters[filter_out - 1].used++;
1951
1952 session[s].filter_out = filter_out;
1953 }
1954 }
1955
1956 // start tidy shutdown of session
1957 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1958 {
1959 int walled_garden = session[s].walled_garden;
1960 bundleidt b = session[s].bundle;
1961 //delete routes only for last session in bundle (in case of MPPP)
1962 int del_routes = !b || (bundle[b].num_of_links == 1);
1963
1964 CSTAT(sessionshutdown);
1965
1966 if (!session[s].opened)
1967 {
1968 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1969 return; // not a live session
1970 }
1971
1972 if (!session[s].die)
1973 {
1974 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1975 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1976 run_plugins(PLUGIN_KILL_SESSION, &data);
1977 session[s].die = TIME + 150; // Clean up in 15 seconds
1978 }
1979
1980 if (session[s].ip && !walled_garden && !session[s].die)
1981 {
1982 // RADIUS Stop message
1983 uint16_t r = radiusnew(s);
1984 if (r)
1985 {
1986 // stop, if not already trying
1987 if (radius[r].state != RADIUSSTOP)
1988 {
1989 radius[r].term_cause = term_cause;
1990 radius[r].term_msg = reason;
1991 radiussend(r, RADIUSSTOP);
1992 }
1993 }
1994 else
1995 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1996
1997 // Save counters to dump to accounting file
1998 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1999 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2000 }
2001
2002 if (session[s].ip)
2003 { // IP allocated, clear and unroute
2004 int r;
2005 int routed = 0;
2006 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2007 {
2008 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2009 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2010 routed++;
2011
2012 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2013 session[s].route[r].ip = 0;
2014 }
2015
2016 if (session[s].ip_pool_index == -1) // static ip
2017 {
2018 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2019 session[s].ip = 0;
2020 }
2021 else
2022 free_ip_address(s);
2023
2024 // unroute IPv6, if setup
2025 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2026 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2027
2028 if (b)
2029 {
2030 // This session was part of a bundle
2031 bundle[b].num_of_links--;
2032 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2033 if(bundle[b].num_of_links == 0)
2034 {
2035 bundleclear(b);
2036 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2037 }
2038 else
2039 {
2040 // Adjust the members array to accomodate the new change
2041 uint8_t mem_num = 0;
2042 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2043 if(bundle[b].members[bundle[b].num_of_links] != s)
2044 {
2045 uint8_t ml;
2046 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2047 if(bundle[b].members[ml] == s)
2048 {
2049 mem_num = ml;
2050 break;
2051 }
2052 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2053 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2054
2055 // If the killed session is the first of the bundle,
2056 // the new first session must be stored in the cache_ipmap
2057 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2058 if (mem_num == 0)
2059 {
2060 sessionidt new_s = bundle[b].members[0];
2061
2062 routed = 0;
2063 // Add the route for this session.
2064 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2065 {
2066 int i, prefixlen;
2067 in_addr_t ip;
2068
2069 prefixlen = session[new_s].route[r].prefixlen;
2070 ip = session[new_s].route[r].ip;
2071
2072 if (!prefixlen) prefixlen = 32;
2073 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2074
2075 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2076 cache_ipmap(i, new_s);
2077 }
2078 cache_ipmap(session[new_s].ip, new_s);
2079
2080 // IPV6 route
2081 if (session[new_s].ipv6prefixlen)
2082 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2083 }
2084 }
2085 }
2086
2087 cluster_send_bundle(b);
2088 }
2089 }
2090
2091 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2092 throttle_session(s, 0, 0);
2093
2094 if (cdn_result)
2095 { // Send CDN
2096 controlt *c = controlnew(14); // sending CDN
2097 if (cdn_error)
2098 {
2099 uint16_t buf[2];
2100 buf[0] = htons(cdn_result);
2101 buf[1] = htons(cdn_error);
2102 controlb(c, 1, (uint8_t *)buf, 4, 1);
2103 }
2104 else
2105 control16(c, 1, cdn_result, 1);
2106
2107 control16(c, 14, s, 1); // assigned session (our end)
2108 controladd(c, session[s].far, session[s].tunnel); // send the message
2109 }
2110
2111 // update filter refcounts
2112 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2113 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2114
2115 // clear PPP state
2116 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2117 sess_local[s].lcp.restart = 0;
2118 sess_local[s].ipcp.restart = 0;
2119 sess_local[s].ipv6cp.restart = 0;
2120 sess_local[s].ccp.restart = 0;
2121
2122 cluster_send_session(s);
2123 }
2124
2125 void sendipcp(sessionidt s, tunnelidt t)
2126 {
2127 uint8_t buf[MAXETHER];
2128 uint8_t *q;
2129
2130 CSTAT(sendipcp);
2131 LOG(3, s, t, "IPCP: send ConfigReq\n");
2132
2133 if (!session[s].unique_id)
2134 {
2135 if (!++last_id) ++last_id; // skip zero
2136 session[s].unique_id = last_id;
2137 }
2138
2139 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2140 if (!q) return;
2141
2142 *q = ConfigReq;
2143 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2144 *(uint16_t *) (q + 2) = htons(10); // packet length
2145 q[4] = 3; // ip address option
2146 q[5] = 6; // option length
2147 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2148 config->bind_address ? config->bind_address :
2149 my_address; // send my IP
2150
2151 tunnelsend(buf, 10 + (q - buf), t); // send it
2152 restart_timer(s, ipcp);
2153 }
2154
2155 void sendipv6cp(sessionidt s, tunnelidt t)
2156 {
2157 uint8_t buf[MAXETHER];
2158 uint8_t *q;
2159
2160 CSTAT(sendipv6cp);
2161 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2162
2163 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2164 if (!q) return;
2165
2166 *q = ConfigReq;
2167 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2168 // only send one type
2169 // of request
2170 *(uint16_t *) (q + 2) = htons(14);
2171 q[4] = 1; // interface identifier option
2172 q[5] = 10; // option length
2173 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2174 *(uint32_t *) (q + 10) = 0;
2175 q[13] = 1;
2176
2177 tunnelsend(buf, 14 + (q - buf), t); // send it
2178 restart_timer(s, ipv6cp);
2179 }
2180
2181 static void sessionclear(sessionidt s)
2182 {
2183 memset(&session[s], 0, sizeof(session[s]));
2184 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2185 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2186
2187 session[s].tunnel = T_FREE; // Mark it as free.
2188 session[s].next = sessionfree;
2189 sessionfree = s;
2190 }
2191
2192 // kill a session now
2193 void sessionkill(sessionidt s, char *reason)
2194 {
2195 CSTAT(sessionkill);
2196
2197 if (!session[s].opened) // not alive
2198 return;
2199
2200 if (session[s].next)
2201 {
2202 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2203 return;
2204 }
2205
2206 if (!session[s].die)
2207 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2208
2209 if (sess_local[s].radius)
2210 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2211
2212 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2213 sessionclear(s);
2214 cluster_send_session(s);
2215 }
2216
2217 static void tunnelclear(tunnelidt t)
2218 {
2219 if (!t) return;
2220 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2221 tunnel[t].state = TUNNELFREE;
2222 }
2223
2224 static void bundleclear(bundleidt b)
2225 {
2226 if (!b) return;
2227 memset(&bundle[b], 0, sizeof(bundle[b]));
2228 bundle[b].state = BUNDLEFREE;
2229 }
2230
2231 // kill a tunnel now
2232 static void tunnelkill(tunnelidt t, char *reason)
2233 {
2234 sessionidt s;
2235 controlt *c;
2236
2237 CSTAT(tunnelkill);
2238
2239 tunnel[t].state = TUNNELDIE;
2240
2241 // free control messages
2242 while ((c = tunnel[t].controls))
2243 {
2244 controlt * n = c->next;
2245 tunnel[t].controls = n;
2246 tunnel[t].controlc--;
2247 c->next = controlfree;
2248 controlfree = c;
2249 }
2250 // kill sessions
2251 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2252 if (session[s].tunnel == t)
2253 sessionkill(s, reason);
2254
2255 // free tunnel
2256 tunnelclear(t);
2257 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2258 cli_tunnel_actions[t].action = 0;
2259 cluster_send_tunnel(t);
2260 }
2261
2262 // shut down a tunnel cleanly
2263 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2264 {
2265 sessionidt s;
2266
2267 CSTAT(tunnelshutdown);
2268
2269 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2270 {
2271 // never set up, can immediately kill
2272 tunnelkill(t, reason);
2273 return;
2274 }
2275 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2276
2277 // close session
2278 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2279 if (session[s].tunnel == t)
2280 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2281
2282 tunnel[t].state = TUNNELDIE;
2283 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2284 cluster_send_tunnel(t);
2285 // TBA - should we wait for sessions to stop?
2286 if (result)
2287 {
2288 controlt *c = controlnew(4); // sending StopCCN
2289 if (error)
2290 {
2291 uint16_t buf[32];
2292 int l = 4;
2293 buf[0] = htons(result);
2294 buf[1] = htons(error);
2295 if (msg)
2296 {
2297 int m = strlen(msg);
2298 if (m + 4 > sizeof(buf))
2299 m = sizeof(buf) - 4;
2300
2301 memcpy(buf+2, msg, m);
2302 l += m;
2303 }
2304
2305 controlb(c, 1, (uint8_t *)buf, l, 1);
2306 }
2307 else
2308 control16(c, 1, result, 1);
2309
2310 control16(c, 9, t, 1); // assigned tunnel (our end)
2311 controladd(c, 0, t); // send the message
2312 }
2313 }
2314
2315 // read and process packet on tunnel (UDP)
2316 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2317 {
2318 uint8_t *chapresponse = NULL;
2319 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2320 uint8_t *p = buf + 2;
2321
2322
2323 CSTAT(processudp);
2324
2325 udp_rx += len;
2326 udp_rx_pkt++;
2327 LOG_HEX(5, "UDP Data", buf, len);
2328 STAT(tunnel_rx_packets);
2329 INC_STAT(tunnel_rx_bytes, len);
2330 if (len < 6)
2331 {
2332 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2333 STAT(tunnel_rx_errors);
2334 return;
2335 }
2336 if ((buf[1] & 0x0F) != 2)
2337 {
2338 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2339 STAT(tunnel_rx_errors);
2340 return;
2341 }
2342 if (*buf & 0x40)
2343 { // length
2344 l = ntohs(*(uint16_t *) p);
2345 p += 2;
2346 }
2347 t = ntohs(*(uint16_t *) p);
2348 p += 2;
2349 s = ntohs(*(uint16_t *) p);
2350 p += 2;
2351 if (s >= MAXSESSION)
2352 {
2353 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2354 STAT(tunnel_rx_errors);
2355 return;
2356 }
2357 if (t >= MAXTUNNEL)
2358 {
2359 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2360 STAT(tunnel_rx_errors);
2361 return;
2362 }
2363 if (*buf & 0x08)
2364 { // ns/nr
2365 ns = ntohs(*(uint16_t *) p);
2366 p += 2;
2367 nr = ntohs(*(uint16_t *) p);
2368 p += 2;
2369 }
2370 if (*buf & 0x02)
2371 { // offset
2372 uint16_t o = ntohs(*(uint16_t *) p);
2373 p += o + 2;
2374 }
2375 if ((p - buf) > l)
2376 {
2377 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2378 STAT(tunnel_rx_errors);
2379 return;
2380 }
2381 l -= (p - buf);
2382
2383 // used to time out old tunnels
2384 if (t && tunnel[t].state == TUNNELOPEN)
2385 tunnel[t].lastrec = time_now;
2386
2387 if (*buf & 0x80)
2388 { // control
2389 uint16_t message = 0xFFFF; // message type
2390 uint8_t fatal = 0;
2391 uint8_t mandatory = 0;
2392 uint16_t asession = 0; // assigned session
2393 uint32_t amagic = 0; // magic number
2394 uint8_t aflags = 0; // flags from last LCF
2395 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2396 char called[MAXTEL] = ""; // called number
2397 char calling[MAXTEL] = ""; // calling number
2398
2399 if (!config->cluster_iam_master)
2400 {
2401 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2402 return;
2403 }
2404
2405 // control messages must have bits 0x80|0x40|0x08
2406 // (type, length and sequence) set, and bits 0x02|0x01
2407 // (offset and priority) clear
2408 if ((*buf & 0xCB) != 0xC8)
2409 {
2410 LOG(1, s, t, "Bad control header %02X\n", *buf);
2411 STAT(tunnel_rx_errors);
2412 return;
2413 }
2414
2415 // check for duplicate tunnel open message
2416 if (!t && ns == 0)
2417 {
2418 int i;
2419
2420 //
2421 // Is this a duplicate of the first packet? (SCCRQ)
2422 //
2423 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2424 {
2425 if (tunnel[i].state != TUNNELOPENING ||
2426 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2427 tunnel[i].port != ntohs(addr->sin_port) )
2428 continue;
2429 t = i;
2430 LOG(3, s, t, "Duplicate SCCRQ?\n");
2431 break;
2432 }
2433 }
2434
2435 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2436 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2437
2438 // if no tunnel specified, assign one
2439 if (!t)
2440 {
2441 if (!(t = new_tunnel()))
2442 {
2443 LOG(1, 0, 0, "No more tunnels\n");
2444 STAT(tunnel_overflow);
2445 return;
2446 }
2447 tunnelclear(t);
2448 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2449 tunnel[t].port = ntohs(addr->sin_port);
2450 tunnel[t].window = 4; // default window
2451 STAT(tunnel_created);
2452 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2453 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2454 }
2455
2456 // If the 'ns' just received is not the 'nr' we're
2457 // expecting, just send an ack and drop it.
2458 //
2459 // if 'ns' is less, then we got a retransmitted packet.
2460 // if 'ns' is greater than missed a packet. Either way
2461 // we should ignore it.
2462 if (ns != tunnel[t].nr)
2463 {
2464 // is this the sequence we were expecting?
2465 STAT(tunnel_rx_errors);
2466 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2467 t, ns, tunnel[t].nr);
2468
2469 if (l) // Is this not a ZLB?
2470 controlnull(t);
2471 return;
2472 }
2473
2474 // check sequence of this message
2475 {
2476 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2477 // some to clear maybe?
2478 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2479 {
2480 controlt *c = tunnel[t].controls;
2481 tunnel[t].controls = c->next;
2482 tunnel[t].controlc--;
2483 c->next = controlfree;
2484 controlfree = c;
2485 skip--;
2486 tunnel[t].try = 0; // we have progress
2487 }
2488
2489 // receiver advance (do here so quoted correctly in any sends below)
2490 if (l) tunnel[t].nr = (ns + 1);
2491 if (skip < 0) skip = 0;
2492 if (skip < tunnel[t].controlc)
2493 {
2494 // some control packets can now be sent that were previous stuck out of window
2495 int tosend = tunnel[t].window - skip;
2496 controlt *c = tunnel[t].controls;
2497 while (c && skip)
2498 {
2499 c = c->next;
2500 skip--;
2501 }
2502 while (c && tosend)
2503 {
2504 tunnel[t].try = 0; // first send
2505 tunnelsend(c->buf, c->length, t);
2506 c = c->next;
2507 tosend--;
2508 }
2509 }
2510 if (!tunnel[t].controlc)
2511 tunnel[t].retry = 0; // caught up
2512 }
2513 if (l)
2514 { // if not a null message
2515 int result = 0;
2516 int error = 0;
2517 char *msg = 0;
2518
2519 // Default disconnect cause/message on receipt of CDN. Set to
2520 // more specific value from attribute 1 (result code) or 46
2521 // (disconnect cause) if present below.
2522 int disc_cause_set = 0;
2523 int disc_cause = TERM_NAS_REQUEST;
2524 char const *disc_reason = "Closed (Received CDN).";
2525
2526 // process AVPs
2527 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2528 {
2529 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2530 uint8_t *b = p;
2531 uint8_t flags = *p;
2532 uint16_t mtype;
2533
2534 if (n > l)
2535 {
2536 LOG(1, s, t, "Invalid length in AVP\n");
2537 STAT(tunnel_rx_errors);
2538 return;
2539 }
2540 p += n; // next
2541 l -= n;
2542 if (flags & 0x3C) // reserved bits, should be clear
2543 {
2544 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2545 fatal = flags;
2546 result = 2; // general error
2547 error = 3; // reserved field non-zero
2548 msg = 0;
2549 continue; // next
2550 }
2551 b += 2;
2552 if (*(uint16_t *) (b))
2553 {
2554 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2555 fatal = flags;
2556 result = 2; // general error
2557 error = 6; // generic vendor-specific error
2558 msg = "unsupported vendor-specific";
2559 continue; // next
2560 }
2561 b += 2;
2562 mtype = ntohs(*(uint16_t *) (b));
2563 b += 2;
2564 n -= 6;
2565
2566 if (flags & 0x40)
2567 {
2568 uint16_t orig_len;
2569
2570 // handle hidden AVPs
2571 if (!*config->l2tp_secret)
2572 {
2573 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2574 fatal = flags;
2575 result = 2; // general error
2576 error = 6; // generic vendor-specific error
2577 msg = "secret not specified";
2578 continue;
2579 }
2580 if (!session[s].random_vector_length)
2581 {
2582 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2583 fatal = flags;
2584 result = 2; // general error
2585 error = 6; // generic
2586 msg = "no random vector";
2587 continue;
2588 }
2589 if (n < 8)
2590 {
2591 LOG(2, s, t, "Short hidden AVP.\n");
2592 fatal = flags;
2593 result = 2; // general error
2594 error = 2; // length is wrong
2595 msg = 0;
2596 continue;
2597 }
2598
2599 // Unhide the AVP
2600 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2601
2602 orig_len = ntohs(*(uint16_t *) b);
2603 if (orig_len > n + 2)
2604 {
2605 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2606 orig_len, n);
2607
2608 fatal = flags;
2609 result = 2; // general error
2610 error = 2; // length is wrong
2611 msg = 0;
2612 continue;
2613 }
2614
2615 b += 2;
2616 n = orig_len;
2617 }
2618
2619 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2620 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2621
2622 switch (mtype)
2623 {
2624 case 0: // message type
2625 message = ntohs(*(uint16_t *) b);
2626 mandatory = flags & 0x80;
2627 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2628 break;
2629 case 1: // result code
2630 {
2631 uint16_t rescode = ntohs(*(uint16_t *) b);
2632 char const *resdesc = "(unknown)";
2633 char const *errdesc = NULL;
2634 int cause = 0;
2635
2636 if (message == 4)
2637 { /* StopCCN */
2638 resdesc = l2tp_stopccn_result_code(rescode);
2639 cause = TERM_LOST_SERVICE;
2640 }
2641 else if (message == 14)
2642 { /* CDN */
2643 resdesc = l2tp_cdn_result_code(rescode);
2644 if (rescode == 1)
2645 cause = TERM_LOST_CARRIER;
2646 else
2647 cause = TERM_ADMIN_RESET;
2648 }
2649
2650 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2651 if (n >= 4)
2652 {
2653 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2654 errdesc = l2tp_error_code(errcode);
2655 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2656 }
2657 if (n > 4)
2658 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2659
2660 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2661 {
2662 disc_cause_set = mtype;
2663 disc_reason = errdesc ? errdesc : resdesc;
2664 disc_cause = cause;
2665 }
2666
2667 break;
2668 }
2669 break;
2670 case 2: // protocol version
2671 {
2672 version = ntohs(*(uint16_t *) (b));
2673 LOG(4, s, t, " Protocol version = %u\n", version);
2674 if (version && version != 0x0100)
2675 { // allow 0.0 and 1.0
2676 LOG(1, s, t, " Bad protocol version %04X\n", version);
2677 fatal = flags;
2678 result = 5; // unspported protocol version
2679 error = 0x0100; // supported version
2680 msg = 0;
2681 continue; // next
2682 }
2683 }
2684 break;
2685 case 3: // framing capabilities
2686 break;
2687 case 4: // bearer capabilities
2688 break;
2689 case 5: // tie breaker
2690 // We never open tunnels, so we don't care about tie breakers
2691 continue;
2692 case 6: // firmware revision
2693 break;
2694 case 7: // host name
2695 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2696 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2697 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2698 // TBA - to send to RADIUS
2699 break;
2700 case 8: // vendor name
2701 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2702 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2703 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2704 break;
2705 case 9: // assigned tunnel
2706 tunnel[t].far = ntohs(*(uint16_t *) (b));
2707 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2708 break;
2709 case 10: // rx window
2710 tunnel[t].window = ntohs(*(uint16_t *) (b));
2711 if (!tunnel[t].window)
2712 tunnel[t].window = 1; // window of 0 is silly
2713 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2714 break;
2715 case 11: // Challenge
2716 {
2717 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2718 build_chap_response(b, 2, n, &chapresponse);
2719 }
2720 break;
2721 case 13: // Response
2722 // Why did they send a response? We never challenge.
2723 LOG(2, s, t, " received unexpected challenge response\n");
2724 break;
2725
2726 case 14: // assigned session
2727 asession = session[s].far = ntohs(*(uint16_t *) (b));
2728 LOG(4, s, t, " assigned session = %u\n", asession);
2729 break;
2730 case 15: // call serial number
2731 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2732 break;
2733 case 18: // bearer type
2734 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2735 // TBA - for RADIUS
2736 break;
2737 case 19: // framing type
2738 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2739 // TBA
2740 break;
2741 case 21: // called number
2742 memset(called, 0, sizeof(called));
2743 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2744 LOG(4, s, t, " Called <%s>\n", called);
2745 break;
2746 case 22: // calling number
2747 memset(calling, 0, sizeof(calling));
2748 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2749 LOG(4, s, t, " Calling <%s>\n", calling);
2750 break;
2751 case 23: // subtype
2752 break;
2753 case 24: // tx connect speed
2754 if (n == 4)
2755 {
2756 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2757 }
2758 else
2759 {
2760 // AS5300s send connect speed as a string
2761 char tmp[30];
2762 memset(tmp, 0, sizeof(tmp));
2763 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2764 session[s].tx_connect_speed = atol(tmp);
2765 }
2766 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2767 break;
2768 case 38: // rx connect speed
2769 if (n == 4)
2770 {
2771 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2772 }
2773 else
2774 {
2775 // AS5300s send connect speed as a string
2776 char tmp[30];
2777 memset(tmp, 0, sizeof(tmp));
2778 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2779 session[s].rx_connect_speed = atol(tmp);
2780 }
2781 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2782 break;
2783 case 25: // Physical Channel ID
2784 {
2785 uint32_t tmp = ntohl(*(uint32_t *) b);
2786 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2787 break;
2788 }
2789 case 29: // Proxy Authentication Type
2790 {
2791 uint16_t atype = ntohs(*(uint16_t *)b);
2792 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2793 break;
2794 }
2795 case 30: // Proxy Authentication Name
2796 {
2797 char authname[64];
2798 memset(authname, 0, sizeof(authname));
2799 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2800 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2801 authname);
2802 break;
2803 }
2804 case 31: // Proxy Authentication Challenge
2805 {
2806 LOG(4, s, t, " Proxy Auth Challenge\n");
2807 break;
2808 }
2809 case 32: // Proxy Authentication ID
2810 {
2811 uint16_t authid = ntohs(*(uint16_t *)(b));
2812 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2813 break;
2814 }
2815 case 33: // Proxy Authentication Response
2816 LOG(4, s, t, " Proxy Auth Response\n");
2817 break;
2818 case 27: // last sent lcp
2819 { // find magic number
2820 uint8_t *p = b, *e = p + n;
2821 while (p + 1 < e && p[1] && p + p[1] <= e)
2822 {
2823 if (*p == 5 && p[1] == 6) // Magic-Number
2824 amagic = ntohl(*(uint32_t *) (p + 2));
2825 else if (*p == 7) // Protocol-Field-Compression
2826 aflags |= SESSION_PFC;
2827 else if (*p == 8) // Address-and-Control-Field-Compression
2828 aflags |= SESSION_ACFC;
2829 p += p[1];
2830 }
2831 }
2832 break;
2833 case 28: // last recv lcp confreq
2834 break;
2835 case 26: // Initial Received LCP CONFREQ
2836 break;
2837 case 39: // seq required - we control it as an LNS anyway...
2838 break;
2839 case 36: // Random Vector
2840 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2841 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2842 if (n > sizeof(session[s].random_vector))
2843 n = sizeof(session[s].random_vector);
2844 memcpy(session[s].random_vector, b, n);
2845 session[s].random_vector_length = n;
2846 break;
2847 case 46: // ppp disconnect cause
2848 if (n >= 5)
2849 {
2850 uint16_t code = ntohs(*(uint16_t *) b);
2851 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2852 uint8_t dir = *(b + 4);
2853
2854 LOG(4, s, t, " PPP disconnect cause "
2855 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2856 code, proto, dir, n - 5, b + 5);
2857
2858 disc_cause_set = mtype;
2859
2860 switch (code)
2861 {
2862 case 1: // admin disconnect
2863 disc_cause = TERM_ADMIN_RESET;
2864 disc_reason = "Administrative disconnect";
2865 break;
2866 case 3: // lcp terminate
2867 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2868 disc_cause = TERM_USER_REQUEST;
2869 disc_reason = "Normal disconnection";
2870 break;
2871 case 4: // compulsory encryption unavailable
2872 if (dir != 1) break; // 1=refused by peer, 2=local
2873 disc_cause = TERM_USER_ERROR;
2874 disc_reason = "Compulsory encryption refused";
2875 break;
2876 case 5: // lcp: fsm timeout
2877 disc_cause = TERM_PORT_ERROR;
2878 disc_reason = "LCP: FSM timeout";
2879 break;
2880 case 6: // lcp: no recognisable lcp packets received
2881 disc_cause = TERM_PORT_ERROR;
2882 disc_reason = "LCP: no recognisable LCP packets";
2883 break;
2884 case 7: // lcp: magic-no error (possibly looped back)
2885 disc_cause = TERM_PORT_ERROR;
2886 disc_reason = "LCP: magic-no error (possible loop)";
2887 break;
2888 case 8: // lcp: echo request timeout
2889 disc_cause = TERM_PORT_ERROR;
2890 disc_reason = "LCP: echo request timeout";
2891 break;
2892 case 13: // auth: fsm timeout
2893 disc_cause = TERM_SERVICE_UNAVAILABLE;
2894 disc_reason = "Authentication: FSM timeout";
2895 break;
2896 case 15: // auth: unacceptable auth protocol
2897 disc_cause = TERM_SERVICE_UNAVAILABLE;
2898 disc_reason = "Unacceptable authentication protocol";
2899 break;
2900 case 16: // auth: authentication failed
2901 disc_cause = TERM_SERVICE_UNAVAILABLE;
2902 disc_reason = "Authentication failed";
2903 break;
2904 case 17: // ncp: fsm timeout
2905 disc_cause = TERM_SERVICE_UNAVAILABLE;
2906 disc_reason = "NCP: FSM timeout";
2907 break;
2908 case 18: // ncp: no ncps available
2909 disc_cause = TERM_SERVICE_UNAVAILABLE;
2910 disc_reason = "NCP: no NCPs available";
2911 break;
2912 case 19: // ncp: failure to converge on acceptable address
2913 disc_cause = TERM_SERVICE_UNAVAILABLE;
2914 disc_reason = (dir == 1)
2915 ? "NCP: too many Configure-Naks received from peer"
2916 : "NCP: too many Configure-Naks sent to peer";
2917 break;
2918 case 20: // ncp: user not permitted to use any address
2919 disc_cause = TERM_SERVICE_UNAVAILABLE;
2920 disc_reason = (dir == 1)
2921 ? "NCP: local link address not acceptable to peer"
2922 : "NCP: remote link address not acceptable";
2923 break;
2924 }
2925 }
2926 break;
2927 default:
2928 {
2929 static char e[] = "unknown AVP 0xXXXX";
2930 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2931 fatal = flags;
2932 result = 2; // general error
2933 error = 8; // unknown mandatory AVP
2934 sprintf((msg = e) + 14, "%04x", mtype);
2935 continue; // next
2936 }
2937 }
2938 }
2939 // process message
2940 if (fatal & 0x80)
2941 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2942 else
2943 switch (message)
2944 {
2945 case 1: // SCCRQ - Start Control Connection Request
2946 tunnel[t].state = TUNNELOPENING;
2947 if (main_quit != QUIT_SHUTDOWN)
2948 {
2949 controlt *c = controlnew(2); // sending SCCRP
2950 control16(c, 2, version, 1); // protocol version
2951 control32(c, 3, 3, 1); // framing
2952 controls(c, 7, hostname, 1); // host name
2953 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2954 control16(c, 9, t, 1); // assigned tunnel
2955 controladd(c, 0, t); // send the resply
2956 }
2957 else
2958 {
2959 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2960 }
2961 break;
2962 case 2: // SCCRP
2963 tunnel[t].state = TUNNELOPEN;
2964 tunnel[t].lastrec = time_now;
2965 break;
2966 case 3: // SCCN
2967 tunnel[t].state = TUNNELOPEN;
2968 tunnel[t].lastrec = time_now;
2969 controlnull(t); // ack
2970 break;
2971 case 4: // StopCCN
2972 controlnull(t); // ack
2973 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2974 break;
2975 case 6: // HELLO
2976 controlnull(t); // simply ACK
2977 break;
2978 case 7: // OCRQ
2979 // TBA
2980 break;
2981 case 8: // OCRO
2982 // TBA
2983 break;
2984 case 9: // OCCN
2985 // TBA
2986 break;
2987 case 10: // ICRQ
2988 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2989 {
2990 controlt *c = controlnew(11); // ICRP
2991
2992 s = sessionfree;
2993 sessionfree = session[s].next;
2994 memset(&session[s], 0, sizeof(session[s]));
2995
2996 if (s > config->cluster_highest_sessionid)
2997 config->cluster_highest_sessionid = s;
2998
2999 session[s].opened = time_now;
3000 session[s].tunnel = t;
3001 session[s].far = asession;
3002 session[s].last_packet = session[s].last_data = time_now;
3003 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3004 control16(c, 14, s, 1); // assigned session
3005 controladd(c, asession, t); // send the reply
3006
3007 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3008 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3009
3010 session[s].ppp.phase = Establish;
3011 session[s].ppp.lcp = Starting;
3012
3013 STAT(session_created);
3014 break;
3015 }
3016
3017 {
3018 controlt *c = controlnew(14); // CDN
3019 if (!sessionfree)
3020 {
3021 STAT(session_overflow);
3022 LOG(1, 0, t, "No free sessions\n");
3023 control16(c, 1, 4, 0); // temporary lack of resources
3024 }
3025 else
3026 control16(c, 1, 2, 7); // shutting down, try another
3027
3028 controladd(c, asession, t); // send the message
3029 }
3030 return;
3031 case 11: // ICRP
3032 // TBA
3033 break;
3034 case 12: // ICCN
3035 if (amagic == 0) amagic = time_now;
3036 session[s].magic = amagic; // set magic number
3037 session[s].flags = aflags; // set flags received
3038 session[s].mru = PPPoE_MRU; // default
3039 controlnull(t); // ack
3040
3041 // start LCP
3042 sess_local[s].lcp_authtype = config->radius_authprefer;
3043 sess_local[s].ppp_mru = MRU;
3044
3045 // Set multilink options before sending initial LCP packet
3046 sess_local[s].mp_mrru = 1614;
3047 sess_local[s].mp_epdis = ntohl(config->bind_address ? config->bind_address : my_address);
3048
3049 sendlcp(s, t);
3050 change_state(s, lcp, RequestSent);
3051 break;
3052
3053 case 14: // CDN
3054 controlnull(t); // ack
3055 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3056 break;
3057 case 0xFFFF:
3058 LOG(1, s, t, "Missing message type\n");
3059 break;
3060 default:
3061 STAT(tunnel_rx_errors);
3062 if (mandatory)
3063 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3064 else
3065 LOG(1, s, t, "Unknown message type %u\n", message);
3066 break;
3067 }
3068 if (chapresponse) free(chapresponse);
3069 cluster_send_tunnel(t);
3070 }
3071 else
3072 {
3073 LOG(4, s, t, " Got a ZLB ack\n");
3074 }
3075 }
3076 else
3077 { // data
3078 uint16_t proto;
3079
3080 LOG_HEX(5, "Receive Tunnel Data", p, l);
3081 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3082 { // HDLC address header, discard
3083 p += 2;
3084 l -= 2;
3085 }
3086 if (l < 2)
3087 {
3088 LOG(1, s, t, "Short ppp length %d\n", l);
3089 STAT(tunnel_rx_errors);
3090 return;
3091 }
3092 if (*p & 1)
3093 {
3094 proto = *p++;
3095 l--;
3096 }
3097 else
3098 {
3099 proto = ntohs(*(uint16_t *) p);
3100 p += 2;
3101 l -= 2;
3102 }
3103
3104 if (s && !session[s].opened) // Is something wrong??
3105 {
3106 if (!config->cluster_iam_master)
3107 {
3108 // Pass it off to the master to deal with..
3109 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3110 return;
3111 }
3112
3113
3114 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3115 STAT(tunnel_rx_errors);
3116 return;
3117 }
3118
3119 if (proto == PPPPAP)
3120 {
3121 session[s].last_packet = time_now;
3122 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3123 processpap(s, t, p, l);
3124 }
3125 else if (proto == PPPCHAP)
3126 {
3127 session[s].last_packet = time_now;
3128 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3129 processchap(s, t, p, l);
3130 }
3131 else if (proto == PPPLCP)
3132 {
3133 session[s].last_packet = time_now;
3134 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3135 processlcp(s, t, p, l);
3136 }
3137 else if (proto == PPPIPCP)
3138 {
3139 session[s].last_packet = time_now;
3140 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3141 processipcp(s, t, p, l);
3142 }
3143 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3144 {
3145 session[s].last_packet = time_now;
3146 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3147 processipv6cp(s, t, p, l);
3148 }
3149 else if (proto == PPPCCP)
3150 {
3151 session[s].last_packet = time_now;
3152 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3153 processccp(s, t, p, l);
3154 }
3155 else if (proto == PPPIP)
3156 {
3157 if (session[s].die)
3158 {
3159 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3160 return; // closing session, PPP not processed
3161 }
3162
3163 session[s].last_packet = session[s].last_data = time_now;
3164 if (session[s].walled_garden && !config->cluster_iam_master)
3165 {
3166 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3167 return;
3168 }
3169
3170 processipin(s, t, p, l);
3171 }
3172 else if (proto == PPPMP)
3173 {
3174 if (session[s].die)
3175 {
3176 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3177 return; // closing session, PPP not processed
3178 }
3179
3180 session[s].last_packet = session[s].last_data = time_now;
3181 if (!config->cluster_iam_master)
3182 {
3183 // The fragments reconstruction is managed by the Master.
3184 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3185 return;
3186 }
3187
3188 processmpin(s, t, p, l);
3189 }
3190 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3191 {
3192 if (session[s].die)
3193 {
3194 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3195 return; // closing session, PPP not processed
3196 }
3197
3198 session[s].last_packet = session[s].last_data = time_now;
3199 if (session[s].walled_garden && !config->cluster_iam_master)
3200 {
3201 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3202 return;
3203 }
3204
3205 processipv6in(s, t, p, l);
3206 }
3207 else if (session[s].ppp.lcp == Opened)
3208 {
3209 session[s].last_packet = time_now;
3210 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3211 protoreject(s, t, p, l, proto);
3212 }
3213 else
3214 {
3215 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3216 proto, ppp_state(session[s].ppp.lcp));
3217 }
3218 }
3219 }
3220
3221 // read and process packet on tun
3222 // (i.e. this routine writes to buf[-8]).
3223 static void processtun(uint8_t * buf, int len)
3224 {
3225 LOG_HEX(5, "Receive TUN Data", buf, len);
3226 STAT(tun_rx_packets);
3227 INC_STAT(tun_rx_bytes, len);
3228
3229 CSTAT(processtun);
3230
3231 eth_rx_pkt++;
3232 eth_rx += len;
3233 if (len < 22)
3234 {
3235 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3236 STAT(tun_rx_errors);
3237 return;
3238 }
3239
3240 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3241 processipout(buf, len);
3242 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3243 && config->ipv6_prefix.s6_addr[0])
3244 processipv6out(buf, len);
3245
3246 // Else discard.
3247 }
3248
3249 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3250 // that we look at the whole of the tunnel, radius and session tables
3251 // every second
3252 static void regular_cleanups(double period)
3253 {
3254 // Next tunnel, radius and session to check for actions on.
3255 static tunnelidt t = 0;
3256 static int r = 0;
3257 static sessionidt s = 0;
3258
3259 int t_actions = 0;
3260 int r_actions = 0;
3261 int s_actions = 0;
3262
3263 int t_slice;
3264 int r_slice;
3265 int s_slice;
3266
3267 int i;
3268 int a;
3269
3270 // divide up tables into slices based on the last run
3271 t_slice = config->cluster_highest_tunnelid * period;
3272 r_slice = (MAXRADIUS - 1) * period;
3273 s_slice = config->cluster_highest_sessionid * period;
3274
3275 if (t_slice < 1)
3276 t_slice = 1;
3277 else if (t_slice > config->cluster_highest_tunnelid)
3278 t_slice = config->cluster_highest_tunnelid;
3279
3280 if (r_slice < 1)
3281 r_slice = 1;
3282 else if (r_slice > (MAXRADIUS - 1))
3283 r_slice = MAXRADIUS - 1;
3284
3285 if (s_slice < 1)
3286 s_slice = 1;
3287 else if (s_slice > config->cluster_highest_sessionid)
3288 s_slice = config->cluster_highest_sessionid;
3289
3290 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3291
3292 for (i = 0; i < t_slice; i++)
3293 {
3294 t++;
3295 if (t > config->cluster_highest_tunnelid)
3296 t = 1;
3297
3298 // check for expired tunnels
3299 if (tunnel[t].die && tunnel[t].die <= TIME)
3300 {
3301 STAT(tunnel_timeout);
3302 tunnelkill(t, "Expired");
3303 t_actions++;
3304 continue;
3305 }
3306 // check for message resend
3307 if (tunnel[t].retry && tunnel[t].controlc)
3308 {
3309 // resend pending messages as timeout on reply
3310 if (tunnel[t].retry <= TIME)
3311 {
3312 controlt *c = tunnel[t].controls;
3313 uint16_t w = tunnel[t].window;
3314 tunnel[t].try++; // another try
3315 if (tunnel[t].try > 5)
3316 tunnelkill(t, "Timeout on control message"); // game over
3317 else
3318 while (c && w--)
3319 {
3320 tunnelsend(c->buf, c->length, t);
3321 c = c->next;
3322 }
3323
3324 t_actions++;
3325 }
3326 }
3327 // Send hello
3328 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3329 {
3330 controlt *c = controlnew(6); // sending HELLO
3331 controladd(c, 0, t); // send the message
3332 LOG(3, 0, t, "Sending HELLO message\n");
3333 t_actions++;
3334 }
3335
3336 // Check for tunnel changes requested from the CLI
3337 if ((a = cli_tunnel_actions[t].action))
3338 {
3339 cli_tunnel_actions[t].action = 0;
3340 if (a & CLI_TUN_KILL)
3341 {
3342 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3343 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3344 t_actions++;
3345 }
3346 }
3347 }
3348
3349 for (i = 0; i < r_slice; i++)
3350 {
3351 r++;
3352 if (r >= MAXRADIUS)
3353 r = 1;
3354
3355 if (!radius[r].state)
3356 continue;
3357
3358 if (radius[r].retry <= TIME)
3359 {
3360 radiusretry(r);
3361 r_actions++;
3362 }
3363 }
3364
3365 for (i = 0; i < s_slice; i++)
3366 {
3367 s++;
3368 if (s > config->cluster_highest_sessionid)
3369 s = 1;
3370
3371 if (!session[s].opened) // Session isn't in use
3372 continue;
3373
3374 // check for expired sessions
3375 if (session[s].die)
3376 {
3377 if (session[s].die <= TIME)
3378 {
3379 sessionkill(s, "Expired");
3380 s_actions++;
3381 }
3382 continue;
3383 }
3384
3385 // PPP timeouts
3386 if (sess_local[s].lcp.restart <= time_now)
3387 {
3388 int next_state = session[s].ppp.lcp;
3389 switch (session[s].ppp.lcp)
3390 {
3391 case RequestSent:
3392 case AckReceived:
3393 next_state = RequestSent;
3394
3395 case AckSent:
3396 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3397 {
3398 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3399 sendlcp(s, session[s].tunnel);
3400 change_state(s, lcp, next_state);
3401 }
3402 else
3403 {
3404 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3405 STAT(session_timeout);
3406 }
3407
3408 s_actions++;
3409 }
3410
3411 if (session[s].die)
3412 continue;
3413 }
3414
3415 if (sess_local[s].ipcp.restart <= time_now)
3416 {
3417 int next_state = session[s].ppp.ipcp;
3418 switch (session[s].ppp.ipcp)
3419 {
3420 case RequestSent:
3421 case AckReceived:
3422 next_state = RequestSent;
3423
3424 case AckSent:
3425 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3426 {
3427 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3428 sendipcp(s, session[s].tunnel);
3429 change_state(s, ipcp, next_state);
3430 }
3431 else
3432 {
3433 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3434 STAT(session_timeout);
3435 }
3436
3437 s_actions++;
3438 }
3439
3440 if (session[s].die)
3441 continue;
3442 }
3443
3444 if (sess_local[s].ipv6cp.restart <= time_now)
3445 {
3446 int next_state = session[s].ppp.ipv6cp;
3447 switch (session[s].ppp.ipv6cp)
3448 {
3449 case RequestSent:
3450 case AckReceived:
3451 next_state = RequestSent;
3452
3453 case AckSent:
3454 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3455 {
3456 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3457 sendipv6cp(s, session[s].tunnel);
3458 change_state(s, ipv6cp, next_state);
3459 }
3460 else
3461 {
3462 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3463 change_state(s, ipv6cp, Stopped);
3464 }
3465
3466 s_actions++;
3467 }
3468 }
3469
3470 if (sess_local[s].ccp.restart <= time_now)
3471 {
3472 int next_state = session[s].ppp.ccp;
3473 switch (session[s].ppp.ccp)
3474 {
3475 case RequestSent:
3476 case AckReceived:
3477 next_state = RequestSent;
3478
3479 case AckSent:
3480 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3481 {
3482 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3483 sendccp(s, session[s].tunnel);
3484 change_state(s, ccp, next_state);
3485 }
3486 else
3487 {
3488 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3489 change_state(s, ccp, Stopped);
3490 }
3491
3492 s_actions++;
3493 }
3494 }
3495
3496 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3497 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3498 {
3499 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3500 STAT(session_timeout);
3501 s_actions++;
3502 continue;
3503 }
3504
3505 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3506 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3507 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3508 {
3509 uint8_t b[MAXETHER];
3510
3511 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3512 if (!q) continue;
3513
3514 *q = EchoReq;
3515 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3516 *(uint16_t *)(q + 2) = htons(8); // Length
3517 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3518
3519 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3520 (int)(time_now - session[s].last_packet));
3521 tunnelsend(b, 24, session[s].tunnel); // send it
3522 sess_local[s].last_echo = time_now;
3523 s_actions++;
3524 }
3525
3526 // Drop sessions who have reached session_timeout seconds
3527 if (session[s].session_timeout)
3528 {
3529 bundleidt bid = session[s].bundle;
3530 if (bid)
3531 {
3532 if (time_now - bundle[bid].last_check >= 1)
3533 {
3534 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3535 bundle[bid].last_check = time_now;
3536 if (bundle[bid].online_time >= session[s].session_timeout)
3537 {
3538 int ses;
3539 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3540 {
3541 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3542 s_actions++;
3543 continue;
3544 }
3545 }
3546 }
3547 }
3548 else if (time_now - session[s].opened >= session[s].session_timeout)
3549 {
3550 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3551 s_actions++;
3552 continue;
3553 }
3554 }
3555
3556 // Drop sessions who have reached idle_timeout seconds
3557 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3558 {
3559 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3560 STAT(session_timeout);
3561 s_actions++;
3562 continue;
3563 }
3564
3565 // Check for actions requested from the CLI
3566 if ((a = cli_session_actions[s].action))
3567 {
3568 int send = 0;
3569
3570 cli_session_actions[s].action = 0;
3571 if (a & CLI_SESS_KILL)
3572 {
3573 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3574 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3575 a = 0; // dead, no need to check for other actions
3576 s_actions++;
3577 }
3578
3579 if (a & CLI_SESS_NOSNOOP)
3580 {
3581 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3582 session[s].snoop_ip = 0;
3583 session[s].snoop_port = 0;
3584 s_actions++;
3585 send++;
3586 }
3587 else if (a & CLI_SESS_SNOOP)
3588 {
3589 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3590 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3591 cli_session_actions[s].snoop_port);
3592
3593 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3594 session[s].snoop_port = cli_session_actions[s].snoop_port;
3595 s_actions++;
3596 send++;
3597 }
3598
3599 if (a & CLI_SESS_NOTHROTTLE)
3600 {
3601 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3602 throttle_session(s, 0, 0);
3603 s_actions++;
3604 send++;
3605 }
3606 else if (a & CLI_SESS_THROTTLE)
3607 {
3608 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3609 cli_session_actions[s].throttle_in,
3610 cli_session_actions[s].throttle_out);
3611
3612 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3613 s_actions++;
3614 send++;
3615 }
3616
3617 if (a & CLI_SESS_NOFILTER)
3618 {
3619 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3620 filter_session(s, 0, 0);
3621 s_actions++;
3622 send++;
3623 }
3624 else if (a & CLI_SESS_FILTER)
3625 {
3626 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3627 cli_session_actions[s].filter_in,
3628 cli_session_actions[s].filter_out);
3629
3630 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3631 s_actions++;
3632 send++;
3633 }
3634
3635 if (send)
3636 cluster_send_session(s);
3637 }
3638
3639 // RADIUS interim accounting
3640 if (config->radius_accounting && config->radius_interim > 0
3641 && session[s].ip && !session[s].walled_garden
3642 && !sess_local[s].radius // RADIUS already in progress
3643 && time_now - sess_local[s].last_interim >= config->radius_interim
3644 && session[s].flags & SESSION_STARTED)
3645 {
3646 int rad = radiusnew(s);
3647 if (!rad)
3648 {
3649 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3650 STAT(radius_overflow);
3651 continue;
3652 }
3653
3654 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3655 session[s].user, session[s].unique_id);
3656
3657 radiussend(rad, RADIUSINTERIM);
3658 sess_local[s].last_interim = time_now;
3659 s_actions++;
3660 }
3661 }
3662
3663 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3664 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3665 }
3666
3667 //
3668 // Are we in the middle of a tunnel update, or radius
3669 // requests??
3670 //
3671 static int still_busy(void)
3672 {
3673 int i;
3674 static clockt last_talked = 0;
3675 static clockt start_busy_wait = 0;
3676
3677 #ifdef BGP
3678 static time_t stopped_bgp = 0;
3679 if (bgp_configured)
3680 {
3681 if (!stopped_bgp)
3682 {
3683 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3684
3685 for (i = 0; i < BGP_NUM_PEERS; i++)
3686 if (bgp_peers[i].state == Established)
3687 bgp_stop(&bgp_peers[i]);
3688
3689 stopped_bgp = time_now;
3690
3691 if (!config->cluster_iam_master)
3692 {
3693 // we don't want to become master
3694 cluster_send_ping(0);
3695
3696 return 1;
3697 }
3698 }
3699
3700 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3701 return 1;
3702 }
3703 #endif /* BGP */
3704
3705 if (!config->cluster_iam_master)
3706 return 0;
3707
3708 if (main_quit == QUIT_SHUTDOWN)
3709 {
3710 static int dropped = 0;
3711 if (!dropped)
3712 {
3713 int i;
3714
3715 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3716 for (i = 1; i < MAXTUNNEL; i++)
3717 if (tunnel[i].ip || tunnel[i].state)
3718 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3719
3720 dropped = 1;
3721 }
3722 }
3723
3724 if (start_busy_wait == 0)
3725 start_busy_wait = TIME;
3726
3727 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3728 {
3729 if (!tunnel[i].controlc)
3730 continue;
3731
3732 if (last_talked != TIME)
3733 {
3734 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3735 last_talked = TIME;
3736 }
3737 return 1;
3738 }
3739
3740 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3741 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3742 {
3743 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3744 return 0;
3745 }
3746
3747 for (i = 1; i < MAXRADIUS; i++)
3748 {
3749 if (radius[i].state == RADIUSNULL)
3750 continue;
3751 if (radius[i].state == RADIUSWAIT)
3752 continue;
3753
3754 if (last_talked != TIME)
3755 {
3756 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3757 last_talked = TIME;
3758 }
3759 return 1;
3760 }
3761
3762 return 0;
3763 }
3764
3765 #ifdef HAVE_EPOLL
3766 # include <sys/epoll.h>
3767 #else
3768 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3769 # include "fake_epoll.h"
3770 #endif
3771
3772 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3773 #define BASE_FDS 7
3774
3775 // additional polled fds
3776 #ifdef BGP
3777 # define EXTRA_FDS BGP_NUM_PEERS
3778 #else
3779 # define EXTRA_FDS 0
3780 #endif
3781
3782 // main loop - gets packets on tun or udp and processes them
3783 static void mainloop(void)
3784 {
3785 int i;
3786 uint8_t buf[65536];
3787 uint8_t *p = buf + 8; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3788 int size_bufp = sizeof(buf) - 8;
3789 clockt next_cluster_ping = 0; // send initial ping immediately
3790 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3791 int maxevent = sizeof(events)/sizeof(*events);
3792
3793 if ((epollfd = epoll_create(maxevent)) < 0)
3794 {
3795 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3796 exit(1);
3797 }
3798
3799 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3800 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3801
3802 /* setup our fds to poll for input */
3803 {
3804 static struct event_data d[BASE_FDS];
3805 struct epoll_event e;
3806
3807 e.events = EPOLLIN;
3808 i = 0;
3809
3810 if (clifd >= 0)
3811 {
3812 d[i].type = FD_TYPE_CLI;
3813 e.data.ptr = &d[i++];
3814 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3815 }
3816
3817 d[i].type = FD_TYPE_CLUSTER;
3818 e.data.ptr = &d[i++];
3819 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3820
3821 d[i].type = FD_TYPE_TUN;
3822 e.data.ptr = &d[i++];
3823 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3824
3825 d[i].type = FD_TYPE_UDP;
3826 e.data.ptr = &d[i++];
3827 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3828
3829 d[i].type = FD_TYPE_CONTROL;
3830 e.data.ptr = &d[i++];
3831 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3832
3833 d[i].type = FD_TYPE_DAE;
3834 e.data.ptr = &d[i++];
3835 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3836
3837 d[i].type = FD_TYPE_NETLINK;
3838 e.data.ptr = &d[i++];
3839 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3840 }
3841
3842 #ifdef BGP
3843 signal(SIGPIPE, SIG_IGN);
3844 bgp_setup(config->as_number);
3845 if (config->bind_address)
3846 bgp_add_route(config->bind_address, 0xffffffff);
3847
3848 for (i = 0; i < BGP_NUM_PEERS; i++)
3849 {
3850 if (config->neighbour[i].name[0])
3851 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3852 config->neighbour[i].as, config->neighbour[i].keepalive,
3853 config->neighbour[i].hold, config->neighbour[i].update_source,
3854 0); /* 0 = routing disabled */
3855 }
3856 #endif /* BGP */
3857
3858 while (!main_quit || still_busy())
3859 {
3860 int more = 0;
3861 int n;
3862
3863
3864 if (main_reload)
3865 {
3866 main_reload = 0;
3867 read_config_file();
3868 config->reload_config++;
3869 }
3870
3871 if (config->reload_config)
3872 {
3873 config->reload_config = 0;
3874 update_config();
3875 }
3876
3877 #ifdef BGP
3878 bgp_set_poll();
3879 #endif /* BGP */
3880
3881 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3882 STAT(select_called);
3883
3884 TIME = now(NULL);
3885 if (n < 0)
3886 {
3887 if (errno == EINTR ||
3888 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3889 continue;
3890
3891 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3892 break; // exit
3893 }
3894
3895 if (n)
3896 {
3897 struct sockaddr_in addr;
3898 struct in_addr local;
3899 socklen_t alen;
3900 int c, s;
3901 int udp_ready = 0;
3902 int tun_ready = 0;
3903 int cluster_ready = 0;
3904 int udp_pkts = 0;
3905 int tun_pkts = 0;
3906 int cluster_pkts = 0;
3907 #ifdef BGP
3908 uint32_t bgp_events[BGP_NUM_PEERS];
3909 memset(bgp_events, 0, sizeof(bgp_events));
3910 #endif /* BGP */
3911
3912 for (c = n, i = 0; i < c; i++)
3913 {
3914 struct event_data *d = events[i].data.ptr;
3915
3916 switch (d->type)
3917 {
3918 case FD_TYPE_CLI: // CLI connections
3919 {
3920 int cli;
3921
3922 alen = sizeof(addr);
3923 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3924 {
3925 cli_do(cli);
3926 close(cli);
3927 }
3928 else
3929 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3930
3931 n--;
3932 break;
3933 }
3934
3935 // these are handled below, with multiple interleaved reads
3936 case FD_TYPE_CLUSTER: cluster_ready++; break;
3937 case FD_TYPE_TUN: tun_ready++; break;
3938 case FD_TYPE_UDP: udp_ready++; break;
3939
3940 case FD_TYPE_CONTROL: // nsctl commands
3941 alen = sizeof(addr);
3942 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3943 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3944 n--;
3945 break;
3946
3947 case FD_TYPE_DAE: // DAE requests
3948 alen = sizeof(addr);
3949 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3950 if (s > 0) processdae(buf, s, &addr, alen, &local);
3951 n--;
3952 break;
3953
3954 case FD_TYPE_RADIUS: // RADIUS response
3955 alen = sizeof(addr);
3956 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3957 if (s >= 0 && config->cluster_iam_master)
3958 {
3959 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3960 addr.sin_addr.s_addr == config->radiusserver[1])
3961 processrad(buf, s, d->index);
3962 else
3963 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3964 fmtaddr(addr.sin_addr.s_addr, 0));
3965 }
3966
3967 n--;
3968 break;
3969
3970 #ifdef BGP
3971 case FD_TYPE_BGP:
3972 bgp_events[d->index] = events[i].events;
3973 n--;
3974 break;
3975 #endif /* BGP */
3976
3977 case FD_TYPE_NETLINK:
3978 {
3979 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
3980 s = netlink_recv(buf, sizeof(buf));
3981 if (nh->nlmsg_type == NLMSG_ERROR)
3982 {
3983 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
3984 if (errmsg->error)
3985 {
3986 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
3987 {
3988 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
3989 exit(1);
3990 }
3991 else
3992
3993 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
3994 }
3995 // else it's a ack
3996 }
3997 else
3998 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);
3999 n--;
4000 break;
4001 }
4002
4003 default:
4004 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4005 }
4006 }
4007
4008 #ifdef BGP
4009 bgp_process(bgp_events);
4010 #endif /* BGP */
4011
4012 for (c = 0; n && c < config->multi_read_count; c++)
4013 {
4014 // L2TP
4015 if (udp_ready)
4016 {
4017 alen = sizeof(addr);
4018 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
4019 {
4020 processudp(buf, s, &addr);
4021 udp_pkts++;
4022 }
4023 else
4024 {
4025 udp_ready = 0;
4026 n--;
4027 }
4028 }
4029
4030 // incoming IP
4031 if (tun_ready)
4032 {
4033 if ((s = read(tunfd, p, size_bufp)) > 0)
4034 {
4035 processtun(p, s);
4036 tun_pkts++;
4037 }
4038 else
4039 {
4040 tun_ready = 0;
4041 n--;
4042 }
4043 }
4044
4045 // cluster
4046 if (cluster_ready)
4047 {
4048 alen = sizeof(addr);
4049 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
4050 {
4051 processcluster(buf, s, addr.sin_addr.s_addr);
4052 cluster_pkts++;
4053 }
4054 else
4055 {
4056 cluster_ready = 0;
4057 n--;
4058 }
4059 }
4060 }
4061
4062 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
4063 STAT(multi_read_used);
4064
4065 if (c >= config->multi_read_count)
4066 {
4067 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
4068 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
4069
4070 STAT(multi_read_exceeded);
4071 more++;
4072 }
4073 }
4074 #ifdef BGP
4075 else
4076 /* no event received, but timers could still have expired */
4077 bgp_process_peers_timers();
4078 #endif /* BGP */
4079
4080 if (time_changed)
4081 {
4082 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4083
4084 // Log current traffic stats
4085 snprintf(config->bandwidth, sizeof(config->bandwidth),
4086 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4087 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4088 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4089 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4090
4091 udp_tx = udp_rx = 0;
4092 udp_rx_pkt = eth_rx_pkt = 0;
4093 eth_tx = eth_rx = 0;
4094 time_changed = 0;
4095
4096 if (config->dump_speed)
4097 printf("%s\n", config->bandwidth);
4098
4099 // Update the internal time counter
4100 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4101
4102 {
4103 // Run timer hooks
4104 struct param_timer p = { time_now };
4105 run_plugins(PLUGIN_TIMER, &p);
4106 }
4107 }
4108
4109 // Runs on every machine (master and slaves).
4110 if (next_cluster_ping <= TIME)
4111 {
4112 // Check to see which of the cluster is still alive..
4113
4114 cluster_send_ping(basetime); // Only does anything if we're a slave
4115 cluster_check_master(); // ditto.
4116
4117 cluster_heartbeat(); // Only does anything if we're a master.
4118 cluster_check_slaves(); // ditto.
4119
4120 master_update_counts(); // If we're a slave, send our byte counters to our master.
4121
4122 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4123 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4124 else
4125 next_cluster_ping = TIME + config->cluster_hb_interval;
4126 }
4127
4128 if (!config->cluster_iam_master)
4129 continue;
4130
4131 // Run token bucket filtering queue..
4132 // Only run it every 1/10th of a second.
4133 {
4134 static clockt last_run = 0;
4135 if (last_run != TIME)
4136 {
4137 last_run = TIME;
4138 tbf_run_timer();
4139 }
4140 }
4141
4142 // Handle timeouts, retries etc.
4143 {
4144 static double last_clean = 0;
4145 double this_clean;
4146 double diff;
4147
4148 TIME = now(&this_clean);
4149 diff = this_clean - last_clean;
4150
4151 // Run during idle time (after we've handled
4152 // all incoming packets) or every 1/10th sec
4153 if (!more || diff > 0.1)
4154 {
4155 regular_cleanups(diff);
4156 last_clean = this_clean;
4157 }
4158 }
4159
4160 if (*config->accounting_dir)
4161 {
4162 static clockt next_acct = 0;
4163 static clockt next_shut_acct = 0;
4164
4165 if (next_acct <= TIME)
4166 {
4167 // Dump accounting data
4168 next_acct = TIME + ACCT_TIME;
4169 next_shut_acct = TIME + ACCT_SHUT_TIME;
4170 dump_acct_info(1);
4171 }
4172 else if (next_shut_acct <= TIME)
4173 {
4174 // Dump accounting data for shutdown sessions
4175 next_shut_acct = TIME + ACCT_SHUT_TIME;
4176 if (shut_acct_n)
4177 dump_acct_info(0);
4178 }
4179 }
4180 }
4181
4182 // Are we the master and shutting down??
4183 if (config->cluster_iam_master)
4184 cluster_heartbeat(); // Flush any queued changes..
4185
4186 // Ok. Notify everyone we're shutting down. If we're
4187 // the master, this will force an election.
4188 cluster_send_ping(0);
4189
4190 //
4191 // Important!!! We MUST not process any packets past this point!
4192 LOG(1, 0, 0, "Shutdown complete\n");
4193 }
4194
4195 static void stripdomain(char *host)
4196 {
4197 char *p;
4198
4199 if ((p = strchr(host, '.')))
4200 {
4201 char *domain = 0;
4202 char _domain[1024];
4203
4204 // strip off domain
4205 FILE *resolv = fopen("/etc/resolv.conf", "r");
4206 if (resolv)
4207 {
4208 char buf[1024];
4209 char *b;
4210
4211 while (fgets(buf, sizeof(buf), resolv))
4212 {
4213 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4214 continue;
4215
4216 if (!isspace(buf[6]))
4217 continue;
4218
4219 b = buf + 7;
4220 while (isspace(*b)) b++;
4221
4222 if (*b)
4223 {
4224 char *d = b;
4225 while (*b && !isspace(*b)) b++;
4226 *b = 0;
4227 if (buf[0] == 'd') // domain is canonical
4228 {
4229 domain = d;
4230 break;
4231 }
4232
4233 // first search line
4234 if (!domain)
4235 {
4236 // hold, may be subsequent domain line
4237 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4238 domain = _domain;
4239 }
4240 }
4241 }
4242
4243 fclose(resolv);
4244 }
4245
4246 if (domain)
4247 {
4248 int hl = strlen(host);
4249 int dl = strlen(domain);
4250 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4251 host[hl -dl - 1] = 0;
4252 }
4253 else
4254 {
4255 *p = 0; // everything after first dot
4256 }
4257 }
4258 }
4259
4260 // Init data structures
4261 static void initdata(int optdebug, char *optconfig)
4262 {
4263 int i;
4264
4265 if (!(config = shared_malloc(sizeof(configt))))
4266 {
4267 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4268 exit(1);
4269 }
4270
4271 memset(config, 0, sizeof(configt));
4272 time(&config->start_time);
4273 strncpy(config->config_file, optconfig, strlen(optconfig));
4274 config->debug = optdebug;
4275 config->num_tbfs = MAXTBFS;
4276 config->rl_rate = 28; // 28kbps
4277 config->cluster_mcast_ttl = 1;
4278 config->cluster_master_min_adv = 1;
4279 config->ppp_restart_time = 3;
4280 config->ppp_max_configure = 10;
4281 config->ppp_max_failure = 5;
4282 config->kill_timedout_sessions = 1;
4283 strcpy(config->random_device, RANDOMDEVICE);
4284 // Set default value echo_timeout and idle_echo_timeout
4285 config->echo_timeout = ECHO_TIMEOUT;
4286 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4287
4288 log_stream = stderr;
4289
4290 #ifdef RINGBUFFER
4291 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4292 {
4293 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4294 exit(1);
4295 }
4296 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4297 #endif
4298
4299 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4300 {
4301 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4302 exit(1);
4303 }
4304 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4305 {
4306 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4307 exit(1);
4308 }
4309 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4310 {
4311 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4312 exit(1);
4313 }
4314 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4315 {
4316 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4317 exit(1);
4318 }
4319 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4320 {
4321 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4322 exit(1);
4323 }
4324
4325 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4326 {
4327 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4328 exit(1);
4329 }
4330
4331 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4332 {
4333 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4334 exit(1);
4335 }
4336
4337 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4338 {
4339 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4340 exit(1);
4341 }
4342
4343 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4344 {
4345 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4346 exit(1);
4347 }
4348 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4349
4350 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4351 {
4352 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4353 exit(1);
4354 }
4355 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4356
4357 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4358 {
4359 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4360 exit(1);
4361 }
4362 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4363
4364 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4365 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4366 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4367 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4368 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4369
4370 // Put all the sessions on the free list marked as undefined.
4371 for (i = 1; i < MAXSESSION; i++)
4372 {
4373 session[i].next = i + 1;
4374 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4375 }
4376 session[MAXSESSION - 1].next = 0;
4377 sessionfree = 1;
4378
4379 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4380 for (i = 1; i < MAXTUNNEL; i++)
4381 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4382
4383 for (i = 1; i < MAXBUNDLE; i++) {
4384 bundle[i].state = BUNDLEUNDEF;
4385 }
4386
4387 if (!*hostname)
4388 {
4389 // Grab my hostname unless it's been specified
4390 gethostname(hostname, sizeof(hostname));
4391 stripdomain(hostname);
4392 }
4393
4394 _statistics->start_time = _statistics->last_reset = time(NULL);
4395
4396 #ifdef BGP
4397 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4398 {
4399 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4400 exit(1);
4401 }
4402 #endif /* BGP */
4403 }
4404
4405 static int assign_ip_address(sessionidt s)
4406 {
4407 uint32_t i;
4408 int best = -1;
4409 time_t best_time = time_now;
4410 char *u = session[s].user;
4411 char reuse = 0;
4412
4413
4414 CSTAT(assign_ip_address);
4415
4416 for (i = 1; i < ip_pool_size; i++)
4417 {
4418 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4419 continue;
4420
4421 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4422 {
4423 best = i;
4424 reuse = 1;
4425 break;
4426 }
4427
4428 if (ip_address_pool[i].last < best_time)
4429 {
4430 best = i;
4431 if (!(best_time = ip_address_pool[i].last))
4432 break; // never used, grab this one
4433 }
4434 }
4435
4436 if (best < 0)
4437 {
4438 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4439 return 0;
4440 }
4441
4442 session[s].ip = ip_address_pool[best].address;
4443 session[s].ip_pool_index = best;
4444 ip_address_pool[best].assigned = 1;
4445 ip_address_pool[best].last = time_now;
4446 ip_address_pool[best].session = s;
4447 if (session[s].walled_garden)
4448 /* Don't track addresses of users in walled garden (note: this
4449 means that their address isn't "sticky" even if they get
4450 un-gardened). */
4451 ip_address_pool[best].user[0] = 0;
4452 else
4453 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4454
4455 STAT(ip_allocated);
4456 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4457 reuse ? "Reusing" : "Allocating", best);
4458
4459 return 1;
4460 }
4461
4462 static void free_ip_address(sessionidt s)
4463 {
4464 int i = session[s].ip_pool_index;
4465
4466
4467 CSTAT(free_ip_address);
4468
4469 if (!session[s].ip)
4470 return; // what the?
4471
4472 if (i < 0) // Is this actually part of the ip pool?
4473 i = 0;
4474
4475 STAT(ip_freed);
4476 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4477 session[s].ip = 0;
4478 ip_address_pool[i].assigned = 0;
4479 ip_address_pool[i].session = 0;
4480 ip_address_pool[i].last = time_now;
4481 }
4482
4483 //
4484 // Fsck the address pool against the session table.
4485 // Normally only called when we become a master.
4486 //
4487 // This isn't perfect: We aren't keep tracking of which
4488 // users used to have an IP address.
4489 //
4490 void rebuild_address_pool(void)
4491 {
4492 int i;
4493
4494 //
4495 // Zero the IP pool allocation, and build
4496 // a map from IP address to pool index.
4497 for (i = 1; i < MAXIPPOOL; ++i)
4498 {
4499 ip_address_pool[i].assigned = 0;
4500 ip_address_pool[i].session = 0;
4501 if (!ip_address_pool[i].address)
4502 continue;
4503
4504 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4505 }
4506
4507 for (i = 0; i < MAXSESSION; ++i)
4508 {
4509 int ipid;
4510 if (!(session[i].opened && session[i].ip))
4511 continue;
4512
4513 ipid = - lookup_ipmap(htonl(session[i].ip));
4514
4515 if (session[i].ip_pool_index < 0)
4516 {
4517 // Not allocated out of the pool.
4518 if (ipid < 1) // Not found in the pool either? good.
4519 continue;
4520
4521 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4522 i, fmtaddr(session[i].ip, 0), ipid);
4523
4524 // Fall through and process it as part of the pool.
4525 }
4526
4527
4528 if (ipid > MAXIPPOOL || ipid < 0)
4529 {
4530 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4531 ipid = -1;
4532 session[i].ip_pool_index = ipid;
4533 continue;
4534 }
4535
4536 ip_address_pool[ipid].assigned = 1;
4537 ip_address_pool[ipid].session = i;
4538 ip_address_pool[ipid].last = time_now;
4539 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4540 session[i].ip_pool_index = ipid;
4541 cache_ipmap(session[i].ip, i); // Fix the ip map.
4542 }
4543 }
4544
4545 //
4546 // Fix the address pool to match a changed session.
4547 // (usually when the master sends us an update).
4548 static void fix_address_pool(int sid)
4549 {
4550 int ipid;
4551
4552 ipid = session[sid].ip_pool_index;
4553
4554 if (ipid > ip_pool_size)
4555 return; // Ignore it. rebuild_address_pool will fix it up.
4556
4557 if (ip_address_pool[ipid].address != session[sid].ip)
4558 return; // Just ignore it. rebuild_address_pool will take care of it.
4559
4560 ip_address_pool[ipid].assigned = 1;
4561 ip_address_pool[ipid].session = sid;
4562 ip_address_pool[ipid].last = time_now;
4563 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4564 }
4565
4566 //
4567 // Add a block of addresses to the IP pool to hand out.
4568 //
4569 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4570 {
4571 int i;
4572 if (prefixlen == 0)
4573 prefixlen = 32; // Host route only.
4574
4575 addr &= 0xffffffff << (32 - prefixlen);
4576
4577 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4578 return ;
4579
4580 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4581 {
4582 if ((i & 0xff) == 0 || (i&0xff) == 255)
4583 continue; // Skip 0 and broadcast addresses.
4584
4585 ip_address_pool[ip_pool_size].address = i;
4586 ip_address_pool[ip_pool_size].assigned = 0;
4587 ++ip_pool_size;
4588 if (ip_pool_size >= MAXIPPOOL)
4589 {
4590 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4591 return;
4592 }
4593 }
4594 }
4595
4596 // Initialize the IP address pool
4597 static void initippool()
4598 {
4599 FILE *f;
4600 char *p;
4601 char buf[4096];
4602 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4603
4604 if (!(f = fopen(IPPOOLFILE, "r")))
4605 {
4606 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4607 exit(1);
4608 }
4609
4610 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4611 {
4612 char *pool = buf;
4613 buf[4095] = 0; // Force it to be zero terminated/
4614
4615 if (*buf == '#' || *buf == '\n')
4616 continue; // Skip comments / blank lines
4617 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4618 if ((p = (char *)strchr(buf, ':')))
4619 {
4620 in_addr_t src;
4621 *p = '\0';
4622 src = inet_addr(buf);
4623 if (src == INADDR_NONE)
4624 {
4625 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4626 exit(1);
4627 }
4628 // This entry is for a specific IP only
4629 if (src != config->bind_address)
4630 continue;
4631 *p = ':';
4632 pool = p+1;
4633 }
4634 if ((p = (char *)strchr(pool, '/')))
4635 {
4636 // It's a range
4637 int numbits = 0;
4638 in_addr_t start = 0;
4639
4640 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4641 *p++ = 0;
4642 if (!*p || !(numbits = atoi(p)))
4643 {
4644 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4645 continue;
4646 }
4647 start = ntohl(inet_addr(pool));
4648
4649 // Add a static route for this pool
4650 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4651 fmtaddr(htonl(start), 0), numbits);
4652
4653 routeset(0, start, numbits, 0, 1);
4654
4655 add_to_ip_pool(start, numbits);
4656 }
4657 else
4658 {
4659 // It's a single ip address
4660 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4661 }
4662 }
4663 fclose(f);
4664 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4665 }
4666
4667 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4668 {
4669 struct sockaddr_in snoop_addr = {0};
4670 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4671 return;
4672
4673 snoop_addr.sin_family = AF_INET;
4674 snoop_addr.sin_addr.s_addr = destination;
4675 snoop_addr.sin_port = ntohs(port);
4676
4677 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4678 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4679 htons(snoop_addr.sin_port));
4680
4681 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4682 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4683
4684 STAT(packets_snooped);
4685 }
4686
4687 static int dump_session(FILE **f, sessiont *s)
4688 {
4689 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4690 return 1;
4691
4692 if (!*f)
4693 {
4694 char filename[1024];
4695 char timestr[64];
4696 time_t now = time(NULL);
4697
4698 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4699 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4700
4701 if (!(*f = fopen(filename, "w")))
4702 {
4703 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4704 return 0;
4705 }
4706
4707 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4708 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4709 "# host: %s\n"
4710 "# endpoint: %s\n"
4711 "# time: %ld\n"
4712 "# uptime: %ld\n"
4713 "# format: username ip qos uptxoctets downrxoctets\n",
4714 hostname,
4715 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4716 now,
4717 now - basetime);
4718 }
4719
4720 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4721 fprintf(*f, "%s %s %d %u %u\n",
4722 s->user, // username
4723 fmtaddr(htonl(s->ip), 0), // ip
4724 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4725 (uint32_t) s->cin_delta, // uptxoctets
4726 (uint32_t) s->cout_delta); // downrxoctets
4727
4728 s->cin_delta = s->cout_delta = 0;
4729
4730 return 1;
4731 }
4732
4733 static void dump_acct_info(int all)
4734 {
4735 int i;
4736 FILE *f = NULL;
4737
4738
4739 CSTAT(dump_acct_info);
4740
4741 if (shut_acct_n)
4742 {
4743 for (i = 0; i < shut_acct_n; i++)
4744 dump_session(&f, &shut_acct[i]);
4745
4746 shut_acct_n = 0;
4747 }
4748
4749 if (all)
4750 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4751 dump_session(&f, &session[i]);
4752
4753 if (f)
4754 fclose(f);
4755 }
4756
4757 // Main program
4758 int main(int argc, char *argv[])
4759 {
4760 int i;
4761 int optdebug = 0;
4762 char *optconfig = CONFIGFILE;
4763
4764 time(&basetime); // start clock
4765
4766 // scan args
4767 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4768 {
4769 switch (i)
4770 {
4771 case 'd':
4772 if (fork()) exit(0);
4773 setsid();
4774 freopen("/dev/null", "r", stdin);
4775 freopen("/dev/null", "w", stdout);
4776 freopen("/dev/null", "w", stderr);
4777 break;
4778 case 'v':
4779 optdebug++;
4780 break;
4781 case 'c':
4782 optconfig = optarg;
4783 break;
4784 case 'h':
4785 snprintf(hostname, sizeof(hostname), "%s", optarg);
4786 break;
4787 default:
4788 printf("Args are:\n"
4789 "\t-d\t\tDetach from terminal\n"
4790 "\t-c <file>\tConfig file\n"
4791 "\t-h <hostname>\tForce hostname\n"
4792 "\t-v\t\tDebug\n");
4793
4794 return (0);
4795 break;
4796 }
4797 }
4798
4799 // Start the timer routine off
4800 time(&time_now);
4801 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4802
4803 initplugins();
4804 initdata(optdebug, optconfig);
4805
4806 init_cli();
4807 read_config_file();
4808 /* set hostname /after/ having read the config file */
4809 if (*config->hostname)
4810 strcpy(hostname, config->hostname);
4811 cli_init_complete(hostname);
4812 update_config();
4813 init_tbf(config->num_tbfs);
4814
4815 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4816 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4817 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4818 {
4819 struct rlimit rlim;
4820 rlim.rlim_cur = RLIM_INFINITY;
4821 rlim.rlim_max = RLIM_INFINITY;
4822 // Remove the maximum core size
4823 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4824 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4825
4826 // Make core dumps go to /tmp
4827 chdir("/tmp");
4828 }
4829
4830 if (config->scheduler_fifo)
4831 {
4832 int ret;
4833 struct sched_param params = {0};
4834 params.sched_priority = 1;
4835
4836 if (get_nprocs() < 2)
4837 {
4838 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4839 config->scheduler_fifo = 0;
4840 }
4841 else
4842 {
4843 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4844 {
4845 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4846 }
4847 else
4848 {
4849 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4850 config->scheduler_fifo = 0;
4851 }
4852 }
4853 }
4854
4855 initnetlink();
4856
4857 /* Set up the cluster communications port. */
4858 if (cluster_init() < 0)
4859 exit(1);
4860
4861 inittun();
4862 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4863
4864 initudp();
4865 initrad();
4866 initippool();
4867
4868 // seed prng
4869 {
4870 unsigned seed = time_now ^ getpid();
4871 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4872 srand(seed);
4873 }
4874
4875 signal(SIGHUP, sighup_handler);
4876 signal(SIGCHLD, sigchild_handler);
4877 signal(SIGTERM, shutdown_handler);
4878 signal(SIGINT, shutdown_handler);
4879 signal(SIGQUIT, shutdown_handler);
4880
4881 // Prevent us from getting paged out
4882 if (config->lock_pages)
4883 {
4884 if (!mlockall(MCL_CURRENT))
4885 LOG(1, 0, 0, "Locking pages into memory\n");
4886 else
4887 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4888 }
4889
4890 mainloop();
4891
4892 /* remove plugins (so cleanup code gets run) */
4893 plugins_done();
4894
4895 // Remove the PID file if we wrote it
4896 if (config->wrote_pid && *config->pid_file == '/')
4897 unlink(config->pid_file);
4898
4899 /* kill CLI children */
4900 signal(SIGTERM, SIG_IGN);
4901 kill(0, SIGTERM);
4902 return 0;
4903 }
4904
4905 static void sighup_handler(int sig)
4906 {
4907 main_reload++;
4908 }
4909
4910 static void shutdown_handler(int sig)
4911 {
4912 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4913 }
4914
4915 static void sigchild_handler(int sig)
4916 {
4917 while (waitpid(-1, NULL, WNOHANG) > 0)
4918 ;
4919 }
4920
4921 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4922 {
4923 MD5_CTX ctx;
4924 *challenge_response = NULL;
4925
4926 if (!*config->l2tp_secret)
4927 {
4928 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4929 return;
4930 }
4931
4932 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4933
4934 *challenge_response = calloc(17, 1);
4935
4936 MD5_Init(&ctx);
4937 MD5_Update(&ctx, &id, 1);
4938 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4939 MD5_Update(&ctx, challenge, challenge_length);
4940 MD5_Final(*challenge_response, &ctx);
4941
4942 return;
4943 }
4944
4945 static int facility_value(char *name)
4946 {
4947 int i;
4948 for (i = 0; facilitynames[i].c_name; i++)
4949 {
4950 if (strcmp(facilitynames[i].c_name, name) == 0)
4951 return facilitynames[i].c_val;
4952 }
4953 return 0;
4954 }
4955
4956 static void update_config()
4957 {
4958 int i;
4959 char *p;
4960 static int timeout = 0;
4961 static int interval = 0;
4962
4963 // Update logging
4964 closelog();
4965 syslog_log = 0;
4966 if (log_stream)
4967 {
4968 if (log_stream != stderr)
4969 fclose(log_stream);
4970
4971 log_stream = NULL;
4972 }
4973
4974 if (*config->log_filename)
4975 {
4976 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4977 {
4978 char *p = config->log_filename + 7;
4979 if (*p)
4980 {
4981 openlog("l2tpns", LOG_PID, facility_value(p));
4982 syslog_log = 1;
4983 }
4984 }
4985 else if (strchr(config->log_filename, '/') == config->log_filename)
4986 {
4987 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4988 {
4989 fseek(log_stream, 0, SEEK_END);
4990 setbuf(log_stream, NULL);
4991 }
4992 else
4993 {
4994 log_stream = stderr;
4995 setbuf(log_stream, NULL);
4996 }
4997 }
4998 }
4999 else
5000 {
5001 log_stream = stderr;
5002 setbuf(log_stream, NULL);
5003 }
5004
5005 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5006 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5007
5008 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5009 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5010 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5011
5012 // reset MRU/MSS globals
5013 MRU = config->l2tp_mtu - L2TP_HDRS;
5014 if (MRU > PPPoE_MRU)
5015 MRU = PPPoE_MRU;
5016
5017 MSS = MRU - TCP_HDRS;
5018
5019 // Update radius
5020 config->numradiusservers = 0;
5021 for (i = 0; i < MAXRADSERVER; i++)
5022 if (config->radiusserver[i])
5023 {
5024 config->numradiusservers++;
5025 // Set radius port: if not set, take the port from the
5026 // first radius server. For the first radius server,
5027 // take the #defined default value from l2tpns.h
5028
5029 // test twice, In case someone works with
5030 // a secondary radius server without defining
5031 // a primary one, this will work even then.
5032 if (i > 0 && !config->radiusport[i])
5033 config->radiusport[i] = config->radiusport[i-1];
5034 if (!config->radiusport[i])
5035 config->radiusport[i] = RADPORT;
5036 }
5037
5038 if (!config->numradiusservers)
5039 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5040
5041 // parse radius_authtypes_s
5042 config->radius_authtypes = config->radius_authprefer = 0;
5043 p = config->radius_authtypes_s;
5044 while (p && *p)
5045 {
5046 char *s = strpbrk(p, " \t,");
5047 int type = 0;
5048
5049 if (s)
5050 {
5051 *s++ = 0;
5052 while (*s == ' ' || *s == '\t')
5053 s++;
5054
5055 if (!*s)
5056 s = 0;
5057 }
5058
5059 if (!strncasecmp("chap", p, strlen(p)))
5060 type = AUTHCHAP;
5061 else if (!strncasecmp("pap", p, strlen(p)))
5062 type = AUTHPAP;
5063 else
5064 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5065
5066 config->radius_authtypes |= type;
5067 if (!config->radius_authprefer)
5068 config->radius_authprefer = type;
5069
5070 p = s;
5071 }
5072
5073 if (!config->radius_authtypes)
5074 {
5075 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5076 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5077 }
5078
5079 // normalise radius_authtypes_s
5080 if (config->radius_authprefer == AUTHPAP)
5081 {
5082 strcpy(config->radius_authtypes_s, "pap");
5083 if (config->radius_authtypes & AUTHCHAP)
5084 strcat(config->radius_authtypes_s, ", chap");
5085 }
5086 else
5087 {
5088 strcpy(config->radius_authtypes_s, "chap");
5089 if (config->radius_authtypes & AUTHPAP)
5090 strcat(config->radius_authtypes_s, ", pap");
5091 }
5092
5093 if (!config->radius_dae_port)
5094 config->radius_dae_port = DAEPORT;
5095
5096 // re-initialise the random number source
5097 initrandom(config->random_device);
5098
5099 // Update plugins
5100 for (i = 0; i < MAXPLUGINS; i++)
5101 {
5102 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5103 continue;
5104
5105 if (*config->plugins[i])
5106 {
5107 // Plugin added
5108 add_plugin(config->plugins[i]);
5109 }
5110 else if (*config->old_plugins[i])
5111 {
5112 // Plugin removed
5113 remove_plugin(config->old_plugins[i]);
5114 }
5115 }
5116
5117 // Guest change
5118 guest_accounts_num = 0;
5119 char *p2 = config->guest_user;
5120 while (p2 && *p2)
5121 {
5122 char *s = strpbrk(p2, " \t,");
5123 if (s)
5124 {
5125 *s++ = 0;
5126 while (*s == ' ' || *s == '\t')
5127 s++;
5128
5129 if (!*s)
5130 s = 0;
5131 }
5132
5133 strcpy(guest_users[guest_accounts_num], p2);
5134 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5135 guest_accounts_num++;
5136 p2 = s;
5137 }
5138 // Rebuild the guest_user array
5139 strcpy(config->guest_user, "");
5140 int ui = 0;
5141 for (ui=0; ui<guest_accounts_num; ui++)
5142 {
5143 strcat(config->guest_user, guest_users[ui]);
5144 if (ui<guest_accounts_num-1)
5145 {
5146 strcat(config->guest_user, ",");
5147 }
5148 }
5149
5150
5151 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5152 if (!config->multi_read_count) config->multi_read_count = 10;
5153 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5154 if (!*config->cluster_interface)
5155 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5156
5157 if (!config->cluster_hb_interval)
5158 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5159
5160 if (!config->cluster_hb_timeout)
5161 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5162
5163 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5164 {
5165 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5166 // late, ensure we're sufficiently larger than that
5167 int t = 4 * config->cluster_hb_interval + 11;
5168
5169 if (config->cluster_hb_timeout < t)
5170 {
5171 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5172 config->cluster_hb_timeout = t;
5173 }
5174
5175 // Push timing changes to the slaves immediately if we're the master
5176 if (config->cluster_iam_master)
5177 cluster_heartbeat();
5178
5179 interval = config->cluster_hb_interval;
5180 timeout = config->cluster_hb_timeout;
5181 }
5182
5183 // Write PID file
5184 if (*config->pid_file == '/' && !config->wrote_pid)
5185 {
5186 FILE *f;
5187 if ((f = fopen(config->pid_file, "w")))
5188 {
5189 fprintf(f, "%d\n", getpid());
5190 fclose(f);
5191 config->wrote_pid = 1;
5192 }
5193 else
5194 {
5195 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5196 }
5197 }
5198 }
5199
5200 static void read_config_file()
5201 {
5202 FILE *f;
5203
5204 if (!config->config_file) return;
5205 if (!(f = fopen(config->config_file, "r")))
5206 {
5207 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5208 return;
5209 }
5210
5211 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5212 cli_do_file(f);
5213 LOG(3, 0, 0, "Done reading config file\n");
5214 fclose(f);
5215 }
5216
5217 int sessionsetup(sessionidt s, tunnelidt t)
5218 {
5219 // A session now exists, set it up
5220 in_addr_t ip;
5221 char *user;
5222 sessionidt i;
5223 int r;
5224
5225 CSTAT(sessionsetup);
5226
5227 LOG(3, s, t, "Doing session setup for session\n");
5228
5229 // Join a bundle if the MRRU option is accepted
5230 if(session[s].mrru > 0 && session[s].bundle == 0)
5231 {
5232 LOG(3, s, t, "This session can be part of multilink bundle\n");
5233 if (join_bundle(s) > 0)
5234 cluster_send_bundle(session[s].bundle);
5235 else
5236 {
5237 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5238 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5239 return 0;
5240 }
5241 }
5242
5243 if (!session[s].ip)
5244 {
5245 assign_ip_address(s);
5246 if (!session[s].ip)
5247 {
5248 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5249 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5250 return 0;
5251 }
5252 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5253 fmtaddr(htonl(session[s].ip), 0));
5254 }
5255
5256 // Make sure this is right
5257 session[s].tunnel = t;
5258
5259 // zap old sessions with same IP and/or username
5260 // Don't kill gardened sessions - doing so leads to a DoS
5261 // from someone who doesn't need to know the password
5262 {
5263 ip = session[s].ip;
5264 user = session[s].user;
5265 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5266 {
5267 if (i == s) continue;
5268 if (!session[s].opened) break;
5269 // Allow duplicate sessions for multilink ones of the same bundle.
5270 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5271
5272 if (ip == session[i].ip)
5273 {
5274 sessionkill(i, "Duplicate IP address");
5275 cluster_listinvert_session(s, i);
5276 continue;
5277 }
5278
5279 if (config->allow_duplicate_users) continue;
5280 if (session[s].walled_garden || session[i].walled_garden) continue;
5281 // Guest change
5282 int found = 0;
5283 int gu;
5284 for (gu = 0; gu < guest_accounts_num; gu++)
5285 {
5286 if (!strcasecmp(user, guest_users[gu]))
5287 {
5288 found = 1;
5289 break;
5290 }
5291 }
5292 if (found) continue;
5293
5294 // Drop the new session in case of duplicate sessionss, not the old one.
5295 if (!strcasecmp(user, session[i].user))
5296 sessionkill(i, "Duplicate session for users");
5297 }
5298 }
5299
5300 // no need to set a route for the same IP address of the bundle
5301 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5302 {
5303 int routed = 0;
5304
5305 // Add the route for this session.
5306 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5307 {
5308 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5309 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5310 routed++;
5311
5312 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5313 }
5314
5315 // Static IPs need to be routed if not already
5316 // convered by a Framed-Route. Anything else is part
5317 // of the IP address pool and is already routed, it
5318 // just needs to be added to the IP cache.
5319 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5320 if (session[s].ip_pool_index == -1) // static ip
5321 {
5322 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5323 }
5324 else
5325 cache_ipmap(session[s].ip, s);
5326 }
5327
5328 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5329 lcp_open(s, t); // transition to Network phase and send initial IPCP
5330
5331 // Run the plugin's against this new session.
5332 {
5333 struct param_new_session data = { &tunnel[t], &session[s] };
5334 run_plugins(PLUGIN_NEW_SESSION, &data);
5335 }
5336
5337 // Allocate TBFs if throttled
5338 if (session[s].throttle_in || session[s].throttle_out)
5339 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5340
5341 session[s].last_packet = session[s].last_data = time_now;
5342
5343 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5344 fmtaddr(htonl(session[s].ip), 0),
5345 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5346
5347 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5348
5349 return 1; // RADIUS OK and IP allocated, done...
5350 }
5351
5352 //
5353 // This session just got dropped on us by the master or something.
5354 // Make sure our tables up up to date...
5355 //
5356 int load_session(sessionidt s, sessiont *new)
5357 {
5358 int i;
5359 int newip = 0;
5360
5361 // Sanity checks.
5362 if (new->ip_pool_index >= MAXIPPOOL ||
5363 new->tunnel >= MAXTUNNEL)
5364 {
5365 LOG(0, s, 0, "Strange session update received!\n");
5366 // FIXME! What to do here?
5367 return 0;
5368 }
5369
5370 //
5371 // Ok. All sanity checks passed. Now we're committed to
5372 // loading the new session.
5373 //
5374
5375 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5376
5377 // See if routes/ip cache need updating
5378 if (new->ip != session[s].ip)
5379 newip++;
5380
5381 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5382 if (new->route[i].ip != session[s].route[i].ip ||
5383 new->route[i].prefixlen != session[s].route[i].prefixlen)
5384 newip++;
5385
5386 // needs update
5387 if (newip)
5388 {
5389 int routed = 0;
5390
5391 // remove old routes...
5392 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5393 {
5394 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5395 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5396 routed++;
5397
5398 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5399 }
5400
5401 // ...ip
5402 if (session[s].ip)
5403 {
5404 if (session[s].ip_pool_index == -1) // static IP
5405 {
5406 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5407 }
5408 else // It's part of the IP pool, remove it manually.
5409 uncache_ipmap(session[s].ip);
5410 }
5411
5412 routed = 0;
5413
5414 // add new routes...
5415 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5416 {
5417 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5418 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5419 routed++;
5420
5421 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5422 }
5423
5424 // ...ip
5425 if (new->ip)
5426 {
5427 // If there's a new one, add it.
5428 if (new->ip_pool_index == -1)
5429 {
5430 if (!routed) routeset(s, new->ip, 0, 0, 1);
5431 }
5432 else
5433 cache_ipmap(new->ip, s);
5434 }
5435 }
5436
5437 // check v6 routing
5438 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5439 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5440
5441 // check filters
5442 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5443 {
5444 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5445 new->filter_in = 0;
5446 }
5447
5448 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5449 {
5450 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5451 new->filter_out = 0;
5452 }
5453
5454 if (new->filter_in != session[s].filter_in)
5455 {
5456 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5457 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5458 }
5459
5460 if (new->filter_out != session[s].filter_out)
5461 {
5462 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5463 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5464 }
5465
5466 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5467 // for walking the sessions to forward byte counts to the master.
5468 config->cluster_highest_sessionid = s;
5469
5470 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5471
5472 // Do fixups into address pool.
5473 if (new->ip_pool_index != -1)
5474 fix_address_pool(s);
5475
5476 return 1;
5477 }
5478
5479 static void initplugins()
5480 {
5481 int i;
5482
5483 loaded_plugins = ll_init();
5484 // Initialize the plugins to nothing
5485 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5486 plugins[i] = ll_init();
5487 }
5488
5489 static void *open_plugin(char *plugin_name, int load)
5490 {
5491 char path[256] = "";
5492
5493 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5494 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5495 return dlopen(path, RTLD_NOW);
5496 }
5497
5498 // plugin callback to get a config value
5499 static void *getconfig(char *key, enum config_typet type)
5500 {
5501 int i;
5502
5503 for (i = 0; config_values[i].key; i++)
5504 {
5505 if (!strcmp(config_values[i].key, key))
5506 {
5507 if (config_values[i].type == type)
5508 return ((void *) config) + config_values[i].offset;
5509
5510 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5511 key, type, config_values[i].type);
5512
5513 return 0;
5514 }
5515 }
5516
5517 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5518 return 0;
5519 }
5520
5521 static int add_plugin(char *plugin_name)
5522 {
5523 static struct pluginfuncs funcs = {
5524 _log,
5525 _log_hex,
5526 fmtaddr,
5527 sessionbyuser,
5528 sessiontbysessionidt,
5529 sessionidtbysessiont,
5530 radiusnew,
5531 radiussend,
5532 getconfig,
5533 sessionshutdown,
5534 sessionkill,
5535 throttle_session,
5536 cluster_send_session,
5537 };
5538
5539 void *p = open_plugin(plugin_name, 1);
5540 int (*initfunc)(struct pluginfuncs *);
5541 int i;
5542
5543 if (!p)
5544 {
5545 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5546 return -1;
5547 }
5548
5549 if (ll_contains(loaded_plugins, p))
5550 {
5551 dlclose(p);
5552 return 0; // already loaded
5553 }
5554
5555 {
5556 int *v = dlsym(p, "plugin_api_version");
5557 if (!v || *v != PLUGIN_API_VERSION)
5558 {
5559 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5560 dlclose(p);
5561 return -1;
5562 }
5563 }
5564
5565 if ((initfunc = dlsym(p, "plugin_init")))
5566 {
5567 if (!initfunc(&funcs))
5568 {
5569 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5570 dlclose(p);
5571 return -1;
5572 }
5573 }
5574
5575 ll_push(loaded_plugins, p);
5576
5577 for (i = 0; i < max_plugin_functions; i++)
5578 {
5579 void *x;
5580 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5581 {
5582 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5583 ll_push(plugins[i], x);
5584 }
5585 }
5586
5587 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5588 return 1;
5589 }
5590
5591 static void run_plugin_done(void *plugin)
5592 {
5593 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5594
5595 if (donefunc)
5596 donefunc();
5597 }
5598
5599 static int remove_plugin(char *plugin_name)
5600 {
5601 void *p = open_plugin(plugin_name, 0);
5602 int loaded = 0;
5603
5604 if (!p)
5605 return -1;
5606
5607 if (ll_contains(loaded_plugins, p))
5608 {
5609 int i;
5610 for (i = 0; i < max_plugin_functions; i++)
5611 {
5612 void *x;
5613 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5614 ll_delete(plugins[i], x);
5615 }
5616
5617 ll_delete(loaded_plugins, p);
5618 run_plugin_done(p);
5619 loaded = 1;
5620 }
5621
5622 dlclose(p);
5623 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5624 return loaded;
5625 }
5626
5627 int run_plugins(int plugin_type, void *data)
5628 {
5629 int (*func)(void *data);
5630
5631 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5632 return PLUGIN_RET_ERROR;
5633
5634 ll_reset(plugins[plugin_type]);
5635 while ((func = ll_next(plugins[plugin_type])))
5636 {
5637 int r = func(data);
5638
5639 if (r != PLUGIN_RET_OK)
5640 return r; // stop here
5641 }
5642
5643 return PLUGIN_RET_OK;
5644 }
5645
5646 static void plugins_done()
5647 {
5648 void *p;
5649
5650 ll_reset(loaded_plugins);
5651 while ((p = ll_next(loaded_plugins)))
5652 run_plugin_done(p);
5653 }
5654
5655 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5656 {
5657 struct nsctl request;
5658 struct nsctl response;
5659 int type = unpack_control(&request, buf, len);
5660 int r;
5661 void *p;
5662
5663 if (log_stream && config->debug >= 4)
5664 {
5665 if (type < 0)
5666 {
5667 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5668 fmtaddr(addr->sin_addr.s_addr, 0), type);
5669 }
5670 else
5671 {
5672 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5673 dump_control(&request, log_stream);
5674 }
5675 }
5676
5677 switch (type)
5678 {
5679 case NSCTL_REQ_LOAD:
5680 if (request.argc != 1)
5681 {
5682 response.type = NSCTL_RES_ERR;
5683 response.argc = 1;
5684 response.argv[0] = "name of plugin required";
5685 }
5686 else if ((r = add_plugin(request.argv[0])) < 1)
5687 {
5688 response.type = NSCTL_RES_ERR;
5689 response.argc = 1;
5690 response.argv[0] = !r
5691 ? "plugin already loaded"
5692 : "error loading plugin";
5693 }
5694 else
5695 {
5696 response.type = NSCTL_RES_OK;
5697 response.argc = 0;
5698 }
5699
5700 break;
5701
5702 case NSCTL_REQ_UNLOAD:
5703 if (request.argc != 1)
5704 {
5705 response.type = NSCTL_RES_ERR;
5706 response.argc = 1;
5707 response.argv[0] = "name of plugin required";
5708 }
5709 else if ((r = remove_plugin(request.argv[0])) < 1)
5710 {
5711 response.type = NSCTL_RES_ERR;
5712 response.argc = 1;
5713 response.argv[0] = !r
5714 ? "plugin not loaded"
5715 : "plugin not found";
5716 }
5717 else
5718 {
5719 response.type = NSCTL_RES_OK;
5720 response.argc = 0;
5721 }
5722
5723 break;
5724
5725 case NSCTL_REQ_HELP:
5726 response.type = NSCTL_RES_OK;
5727 response.argc = 0;
5728
5729 ll_reset(loaded_plugins);
5730 while ((p = ll_next(loaded_plugins)))
5731 {
5732 char **help = dlsym(p, "plugin_control_help");
5733 while (response.argc < 0xff && help && *help)
5734 response.argv[response.argc++] = *help++;
5735 }
5736
5737 break;
5738
5739 case NSCTL_REQ_CONTROL:
5740 {
5741 struct param_control param = {
5742 config->cluster_iam_master,
5743 request.argc,
5744 request.argv,
5745 0,
5746 NULL,
5747 };
5748
5749 int r = run_plugins(PLUGIN_CONTROL, &param);
5750
5751 if (r == PLUGIN_RET_ERROR)
5752 {
5753 response.type = NSCTL_RES_ERR;
5754 response.argc = 1;
5755 response.argv[0] = param.additional
5756 ? param.additional
5757 : "error returned by plugin";
5758 }
5759 else if (r == PLUGIN_RET_NOTMASTER)
5760 {
5761 static char msg[] = "must be run on master: 000.000.000.000";
5762
5763 response.type = NSCTL_RES_ERR;
5764 response.argc = 1;
5765 if (config->cluster_master_address)
5766 {
5767 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5768 response.argv[0] = msg;
5769 }
5770 else
5771 {
5772 response.argv[0] = "must be run on master: none elected";
5773 }
5774 }
5775 else if (!(param.response & NSCTL_RESPONSE))
5776 {
5777 response.type = NSCTL_RES_ERR;
5778 response.argc = 1;
5779 response.argv[0] = param.response
5780 ? "unrecognised response value from plugin"
5781 : "unhandled action";
5782 }
5783 else
5784 {
5785 response.type = param.response;
5786 response.argc = 0;
5787 if (param.additional)
5788 {
5789 response.argc = 1;
5790 response.argv[0] = param.additional;
5791 }
5792 }
5793 }
5794
5795 break;
5796
5797 default:
5798 response.type = NSCTL_RES_ERR;
5799 response.argc = 1;
5800 response.argv[0] = "error unpacking control packet";
5801 }
5802
5803 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5804 if (!buf)
5805 {
5806 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5807 return;
5808 }
5809
5810 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5811 if (r > 0)
5812 {
5813 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5814 if (log_stream && config->debug >= 4)
5815 {
5816 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5817 dump_control(&response, log_stream);
5818 }
5819 }
5820 else
5821 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5822 fmtaddr(addr->sin_addr.s_addr, 0), r);
5823
5824 free(buf);
5825 }
5826
5827 static tunnelidt new_tunnel()
5828 {
5829 tunnelidt i;
5830 for (i = 1; i < MAXTUNNEL; i++)
5831 {
5832 if (tunnel[i].state == TUNNELFREE)
5833 {
5834 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5835 if (i > config->cluster_highest_tunnelid)
5836 config->cluster_highest_tunnelid = i;
5837 return i;
5838 }
5839 }
5840 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5841 return 0;
5842 }
5843
5844 //
5845 // We're becoming the master. Do any required setup..
5846 //
5847 // This is principally telling all the plugins that we're
5848 // now a master, and telling them about all the sessions
5849 // that are active too..
5850 //
5851 void become_master(void)
5852 {
5853 int s, i;
5854 static struct event_data d[RADIUS_FDS];
5855 struct epoll_event e;
5856
5857 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5858
5859 // running a bunch of iptables commands is slow and can cause
5860 // the master to drop tunnels on takeover--kludge around the
5861 // problem by forking for the moment (note: race)
5862 if (!fork_and_close())
5863 {
5864 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5865 {
5866 if (!session[s].opened) // Not an in-use session.
5867 continue;
5868
5869 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5870 }
5871 exit(0);
5872 }
5873
5874 // add radius fds
5875 e.events = EPOLLIN;
5876 for (i = 0; i < RADIUS_FDS; i++)
5877 {
5878 d[i].type = FD_TYPE_RADIUS;
5879 d[i].index = i;
5880 e.data.ptr = &d[i];
5881
5882 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5883 }
5884 }
5885
5886 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5887 {
5888 int s, i;
5889 int count = 0;
5890 int buckets[64];
5891
5892 if (CLI_HELP_REQUESTED)
5893 return CLI_HELP_NO_ARGS;
5894
5895 time(&time_now);
5896 for (i = 0; i < 64;++i) buckets[i] = 0;
5897
5898 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5899 {
5900 int idle;
5901 if (!session[s].opened)
5902 continue;
5903
5904 idle = time_now - session[s].last_data;
5905 idle /= 5 ; // In multiples of 5 seconds.
5906 if (idle < 0)
5907 idle = 0;
5908 if (idle > 63)
5909 idle = 63;
5910
5911 ++count;
5912 ++buckets[idle];
5913 }
5914
5915 for (i = 0; i < 63; ++i)
5916 {
5917 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5918 }
5919 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5920 cli_print(cli, "%d total sessions open.", count);
5921 return CLI_OK;
5922 }
5923
5924 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5925 {
5926 int s, i;
5927 int count = 0;
5928 int buckets[64];
5929
5930 if (CLI_HELP_REQUESTED)
5931 return CLI_HELP_NO_ARGS;
5932
5933 time(&time_now);
5934 for (i = 0; i < 64;++i) buckets[i] = 0;
5935
5936 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5937 {
5938 int open = 0, d;
5939 if (!session[s].opened)
5940 continue;
5941
5942 d = time_now - session[s].opened;
5943 if (d < 0)
5944 d = 0;
5945 while (d > 1 && open < 32)
5946 {
5947 ++open;
5948 d >>= 1; // half.
5949 }
5950 ++count;
5951 ++buckets[open];
5952 }
5953
5954 s = 1;
5955 for (i = 0; i < 30; ++i)
5956 {
5957 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5958 s <<= 1;
5959 }
5960 cli_print(cli, "%d total sessions open.", count);
5961 return CLI_OK;
5962 }
5963
5964 /* Unhide an avp.
5965 *
5966 * This unencodes the AVP using the L2TP secret and the previously
5967 * stored random vector. It overwrites the hidden data with the
5968 * unhidden AVP subformat.
5969 */
5970 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5971 {
5972 MD5_CTX ctx;
5973 uint8_t digest[16];
5974 uint8_t *last;
5975 size_t d = 0;
5976 uint16_t m = htons(type);
5977
5978 // Compute initial pad
5979 MD5_Init(&ctx);
5980 MD5_Update(&ctx, (unsigned char *) &m, 2);
5981 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5982 MD5_Update(&ctx, vector, vec_len);
5983 MD5_Final(digest, &ctx);
5984
5985 // pointer to last decoded 16 octets
5986 last = value;
5987
5988 while (len > 0)
5989 {
5990 // calculate a new pad based on the last decoded block
5991 if (d >= sizeof(digest))
5992 {
5993 MD5_Init(&ctx);
5994 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5995 MD5_Update(&ctx, last, sizeof(digest));
5996 MD5_Final(digest, &ctx);
5997
5998 d = 0;
5999 last = value;
6000 }
6001
6002 *value++ ^= digest[d++];
6003 len--;
6004 }
6005 }
6006
6007 int find_filter(char const *name, size_t len)
6008 {
6009 int free = -1;
6010 int i;
6011
6012 for (i = 0; i < MAXFILTER; i++)
6013 {
6014 if (!*ip_filters[i].name)
6015 {
6016 if (free < 0)
6017 free = i;
6018
6019 continue;
6020 }
6021
6022 if (strlen(ip_filters[i].name) != len)
6023 continue;
6024
6025 if (!strncmp(ip_filters[i].name, name, len))
6026 return i;
6027 }
6028
6029 return free;
6030 }
6031
6032 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6033 {
6034 switch (p->op)
6035 {
6036 case FILTER_PORT_OP_EQ: return port == p->port;
6037 case FILTER_PORT_OP_NEQ: return port != p->port;
6038 case FILTER_PORT_OP_GT: return port > p->port;
6039 case FILTER_PORT_OP_LT: return port < p->port;
6040 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6041 }
6042
6043 return 0;
6044 }
6045
6046 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6047 {
6048 switch (op)
6049 {
6050 case FILTER_FLAG_OP_ANY:
6051 return (flags & sflags) || (~flags & cflags);
6052
6053 case FILTER_FLAG_OP_ALL:
6054 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6055
6056 case FILTER_FLAG_OP_EST:
6057 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6058 }
6059
6060 return 0;
6061 }
6062
6063 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6064 {
6065 uint16_t frag_offset;
6066 uint8_t proto;
6067 in_addr_t src_ip;
6068 in_addr_t dst_ip;
6069 uint16_t src_port = 0;
6070 uint16_t dst_port = 0;
6071 uint8_t flags = 0;
6072 ip_filter_rulet *rule;
6073
6074 if (len < 20) // up to end of destination address
6075 return 0;
6076
6077 if ((*buf >> 4) != 4) // IPv4
6078 return 0;
6079
6080 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6081 proto = buf[9];
6082 src_ip = *(in_addr_t *) (buf + 12);
6083 dst_ip = *(in_addr_t *) (buf + 16);
6084
6085 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6086 {
6087 int l = (buf[0] & 0xf) * 4; // length of IP header
6088 if (len < l + 4) // ports
6089 return 0;
6090
6091 src_port = ntohs(*(uint16_t *) (buf + l));
6092 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6093 if (proto == IPPROTO_TCP)
6094 {
6095 if (len < l + 14) // flags
6096 return 0;
6097
6098 flags = buf[l + 13] & 0x3f;
6099 }
6100 }
6101
6102 for (rule = ip_filters[filter].rules; rule->action; rule++)
6103 {
6104 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6105 continue;
6106
6107 if (rule->src_wild != INADDR_BROADCAST &&
6108 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6109 continue;
6110
6111 if (rule->dst_wild != INADDR_BROADCAST &&
6112 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6113 continue;
6114
6115 if (frag_offset)
6116 {
6117 // layer 4 deny rules are skipped
6118 if (rule->action == FILTER_ACTION_DENY &&
6119 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6120 continue;
6121 }
6122 else
6123 {
6124 if (rule->frag)
6125 continue;
6126
6127 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6128 {
6129 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6130 continue;
6131
6132 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6133 continue;
6134
6135 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6136 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6137 continue;
6138 }
6139 }
6140
6141 // matched
6142 rule->counter++;
6143 return rule->action == FILTER_ACTION_PERMIT;
6144 }
6145
6146 // default deny
6147 return 0;
6148 }