f530955d7e487ccb036c2a2303697ef5cbda544b
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp $";
8
9 #include <arpa/inet.h>
10 #include <assert.h>
11 #include <errno.h>
12 #include <fcntl.h>
13 #include <linux/if_tun.h>
14 #define SYSLOG_NAMES
15 #include <syslog.h>
16 #include <malloc.h>
17 #include <math.h>
18 #include <net/route.h>
19 #include <sys/mman.h>
20 #include <netdb.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
23 #include <stdarg.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <ctype.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <sys/stat.h>
31 #include <sys/time.h>
32 #include <sys/resource.h>
33 #include <sys/wait.h>
34 #include <linux/if.h>
35 #include <stddef.h>
36 #include <time.h>
37 #include <dlfcn.h>
38 #include <unistd.h>
39 #include <sched.h>
40 #include <sys/sysinfo.h>
41 #include <libcli.h>
42 #include <linux/netlink.h>
43 #include <linux/rtnetlink.h>
44
45 #include "md5.h"
46 #include "l2tpns.h"
47 #include "cluster.h"
48 #include "plugin.h"
49 #include "ll.h"
50 #include "constants.h"
51 #include "control.h"
52 #include "util.h"
53 #include "tbf.h"
54
55 #ifdef BGP
56 #include "bgp.h"
57 #endif
58
59 // Globals
60 configt *config = NULL; // all configuration
61 int nlfd = -1; // netlink socket
62 int tunfd = -1; // tun interface file handle. (network device)
63 int udpfd = -1; // UDP file handle
64 int controlfd = -1; // Control signal handle
65 int clifd = -1; // Socket listening for CLI connections.
66 int daefd = -1; // Socket listening for DAE connections.
67 int snoopfd = -1; // UDP file handle for sending out intercept data
68 int *radfds = NULL; // RADIUS requests file handles
69 int rand_fd = -1; // Random data source
70 int cluster_sockfd = -1; // Intra-cluster communications socket.
71 int epollfd = -1; // event polling
72 time_t basetime = 0; // base clock
73 char hostname[1000] = ""; // us.
74 static int tunidx; // ifr_ifindex of tun device
75 int nlseqnum = 0; // netlink sequence number
76 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
77 static int syslog_log = 0; // are we logging to syslog
78 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
79 uint32_t last_id = 0; // Unique ID for radius accounting
80 // Guest change
81 char guest_users[10][32]; // Array of guest users
82 int guest_accounts_num = 0; // Number of guest users
83
84 // calculated from config->l2tp_mtu
85 uint16_t MRU = 0; // PPP MRU
86 uint16_t MSS = 0; // TCP MSS
87
88 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
89 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
90
91 union iphash {
92 sessionidt sess;
93 union iphash *idx;
94 } ip_hash[256]; // Mapping from IP address to session structures.
95
96 struct ipv6radix {
97 sessionidt sess;
98 struct ipv6radix *branch;
99 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
100
101 // Traffic counters.
102 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
103 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
104 uint32_t eth_tx = 0;
105
106 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
107 time_t time_now = 0; // Current time in seconds since epoch.
108 static char time_now_string[64] = {0}; // Current time as a string.
109 static int time_changed = 0; // time_now changed
110 char main_quit = 0; // True if we're in the process of exiting.
111 static char main_reload = 0; // Re-load pending
112 linked_list *loaded_plugins;
113 linked_list *plugins[MAX_PLUGIN_TYPES];
114
115 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
116 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
117
118 config_descriptt config_values[] = {
119 CONFIG("debug", debug, INT),
120 CONFIG("log_file", log_filename, STRING),
121 CONFIG("pid_file", pid_file, STRING),
122 CONFIG("random_device", random_device, STRING),
123 CONFIG("l2tp_secret", l2tp_secret, STRING),
124 CONFIG("l2tp_mtu", l2tp_mtu, INT),
125 CONFIG("ppp_restart_time", ppp_restart_time, INT),
126 CONFIG("ppp_max_configure", ppp_max_configure, INT),
127 CONFIG("ppp_max_failure", ppp_max_failure, INT),
128 CONFIG("primary_dns", default_dns1, IPv4),
129 CONFIG("secondary_dns", default_dns2, IPv4),
130 CONFIG("primary_radius", radiusserver[0], IPv4),
131 CONFIG("secondary_radius", radiusserver[1], IPv4),
132 CONFIG("primary_radius_port", radiusport[0], SHORT),
133 CONFIG("secondary_radius_port", radiusport[1], SHORT),
134 CONFIG("radius_accounting", radius_accounting, BOOL),
135 CONFIG("radius_interim", radius_interim, INT),
136 CONFIG("radius_secret", radiussecret, STRING),
137 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
138 CONFIG("radius_dae_port", radius_dae_port, SHORT),
139 CONFIG("radius_bind_min", radius_bind_min, SHORT),
140 CONFIG("radius_bind_max", radius_bind_max, SHORT),
141 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
142 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
143 CONFIG("guest_account", guest_user, STRING),
144 CONFIG("bind_address", bind_address, IPv4),
145 CONFIG("peer_address", peer_address, IPv4),
146 CONFIG("send_garp", send_garp, BOOL),
147 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
148 CONFIG("throttle_buckets", num_tbfs, INT),
149 CONFIG("accounting_dir", accounting_dir, STRING),
150 CONFIG("dump_speed", dump_speed, BOOL),
151 CONFIG("multi_read_count", multi_read_count, INT),
152 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
153 CONFIG("lock_pages", lock_pages, BOOL),
154 CONFIG("icmp_rate", icmp_rate, INT),
155 CONFIG("packet_limit", max_packets, INT),
156 CONFIG("cluster_address", cluster_address, IPv4),
157 CONFIG("cluster_interface", cluster_interface, STRING),
158 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
159 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
160 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
161 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
162 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
163 { NULL, 0, 0, 0 },
164 };
165
166 static char *plugin_functions[] = {
167 NULL,
168 "plugin_pre_auth",
169 "plugin_post_auth",
170 "plugin_packet_rx",
171 "plugin_packet_tx",
172 "plugin_timer",
173 "plugin_new_session",
174 "plugin_kill_session",
175 "plugin_control",
176 "plugin_radius_response",
177 "plugin_radius_reset",
178 "plugin_radius_account",
179 "plugin_become_master",
180 "plugin_new_session_master",
181 };
182
183 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
184
185 // Counters for shutdown sessions
186 static sessiont shut_acct[8192];
187 static sessionidt shut_acct_n = 0;
188
189 tunnelt *tunnel = NULL; // Array of tunnel structures.
190 bundlet *bundle = NULL; // Array of bundle structures.
191 fragmentationt *frag = NULL; // Array of fragmentation structures.
192 sessiont *session = NULL; // Array of session structures.
193 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
194 radiust *radius = NULL; // Array of radius structures.
195 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
196 ip_filtert *ip_filters = NULL; // Array of named filters.
197 static controlt *controlfree = 0;
198 struct Tstats *_statistics = NULL;
199 #ifdef RINGBUFFER
200 struct Tringbuffer *ringbuffer = NULL;
201 #endif
202
203 static void cache_ipmap(in_addr_t ip, sessionidt s);
204 static void uncache_ipmap(in_addr_t ip);
205 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
206 static void free_ip_address(sessionidt s);
207 static void dump_acct_info(int all);
208 static void sighup_handler(int sig);
209 static void shutdown_handler(int sig);
210 static void sigchild_handler(int sig);
211 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
212 static void update_config(void);
213 static void read_config_file(void);
214 static void initplugins(void);
215 static int add_plugin(char *plugin_name);
216 static int remove_plugin(char *plugin_name);
217 static void plugins_done(void);
218 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
219 static tunnelidt new_tunnel(void);
220 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
221 static void bundleclear(bundleidt b);
222
223 // on slaves, alow BGP to withdraw cleanly before exiting
224 #define QUIT_DELAY 5
225
226 // quit actions (master)
227 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
228 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
229
230 // return internal time (10ths since process startup), set f if given
231 // as a side-effect sets time_now, and time_changed
232 static clockt now(double *f)
233 {
234 struct timeval t;
235 gettimeofday(&t, 0);
236 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
237 if (t.tv_sec != time_now)
238 {
239 time_now = t.tv_sec;
240 time_changed++;
241 }
242 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
243 }
244
245 // work out a retry time based on try number
246 // This is a straight bounded exponential backoff.
247 // Maximum re-try time is 32 seconds. (2^5).
248 clockt backoff(uint8_t try)
249 {
250 if (try > 5) try = 5; // max backoff
251 return now(NULL) + 10 * (1 << try);
252 }
253
254
255 //
256 // Log a debug message. Typically called via the LOG macro
257 //
258 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
259 {
260 static char message[65536] = {0};
261 va_list ap;
262
263 #ifdef RINGBUFFER
264 if (ringbuffer)
265 {
266 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
267 ringbuffer->tail = 0;
268 if (ringbuffer->tail == ringbuffer->head)
269 if (++ringbuffer->head >= RINGBUFFER_SIZE)
270 ringbuffer->head = 0;
271
272 ringbuffer->buffer[ringbuffer->tail].level = level;
273 ringbuffer->buffer[ringbuffer->tail].session = s;
274 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
275 va_start(ap, format);
276 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
277 va_end(ap);
278 }
279 #endif
280
281 if (config->debug < level) return;
282
283 va_start(ap, format);
284 vsnprintf(message, sizeof(message), format, ap);
285
286 if (log_stream)
287 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
288 else if (syslog_log)
289 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
290
291 va_end(ap);
292 }
293
294 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
295 {
296 int i, j;
297 const uint8_t *d = data;
298
299 if (config->debug < level) return;
300
301 // No support for _log_hex to syslog
302 if (log_stream)
303 {
304 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
305 setvbuf(log_stream, NULL, _IOFBF, 16384);
306
307 for (i = 0; i < maxsize; )
308 {
309 fprintf(log_stream, "%4X: ", i);
310 for (j = i; j < maxsize && j < (i + 16); j++)
311 {
312 fprintf(log_stream, "%02X ", d[j]);
313 if (j == i + 7)
314 fputs(": ", log_stream);
315 }
316
317 for (; j < i + 16; j++)
318 {
319 fputs(" ", log_stream);
320 if (j == i + 7)
321 fputs(": ", log_stream);
322 }
323
324 fputs(" ", log_stream);
325 for (j = i; j < maxsize && j < (i + 16); j++)
326 {
327 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
328 fputc(d[j], log_stream);
329 else
330 fputc('.', log_stream);
331
332 if (j == i + 7)
333 fputs(" ", log_stream);
334 }
335
336 i = j;
337 fputs("\n", log_stream);
338 }
339
340 fflush(log_stream);
341 setbuf(log_stream, NULL);
342 }
343 }
344
345 // update a counter, accumulating 2^32 wraps
346 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
347 {
348 uint32_t new = *counter + delta;
349 if (new < *counter)
350 (*wrap)++;
351
352 *counter = new;
353 }
354
355 // initialise the random generator
356 static void initrandom(char *source)
357 {
358 static char path[sizeof(config->random_device)] = "*undefined*";
359
360 // reinitialise only if we are forced to do so or if the config has changed
361 if (source && !strncmp(path, source, sizeof(path)))
362 return;
363
364 // close previous source, if any
365 if (rand_fd >= 0)
366 close(rand_fd);
367
368 rand_fd = -1;
369
370 if (source)
371 {
372 // register changes
373 snprintf(path, sizeof(path), "%s", source);
374
375 if (*path == '/')
376 {
377 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
378 if (rand_fd < 0)
379 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
380 path, strerror(errno));
381 }
382 }
383 }
384
385 // fill buffer with random data
386 void random_data(uint8_t *buf, int len)
387 {
388 int n = 0;
389
390 CSTAT(random_data);
391 if (rand_fd >= 0)
392 {
393 n = read(rand_fd, buf, len);
394 if (n >= len) return;
395 if (n < 0)
396 {
397 if (errno != EAGAIN)
398 {
399 LOG(0, 0, 0, "Error reading from random source: %s\n",
400 strerror(errno));
401
402 // fall back to rand()
403 initrandom(NULL);
404 }
405
406 n = 0;
407 }
408 }
409
410 // append missing data
411 while (n < len)
412 // not using the low order bits from the prng stream
413 buf[n++] = (rand() >> 4) & 0xff;
414 }
415
416 // Add a route
417 //
418 // This adds it to the routing table, advertises it
419 // via BGP if enabled, and stuffs it into the
420 // 'sessionbyip' cache.
421 //
422 // 'ip' must be in _host_ order.
423 //
424 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
425 {
426 struct rtentry r;
427 in_addr_t mask;
428 int i;
429
430 if (!prefixlen) prefixlen = 32;
431
432 mask = 0xffffffff << (32 - prefixlen);
433
434 ip &= mask; // Force the ip to be the first one in the route.
435
436 memset(&r, 0, sizeof(r));
437 r.rt_dev = config->tundevice;
438 r.rt_dst.sa_family = AF_INET;
439 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
440 r.rt_gateway.sa_family = AF_INET;
441 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
442 r.rt_genmask.sa_family = AF_INET;
443 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
444 r.rt_flags = (RTF_UP | RTF_STATIC);
445 if (gw)
446 r.rt_flags |= RTF_GATEWAY;
447 else if (prefixlen == 32)
448 r.rt_flags |= RTF_HOST;
449
450 LOG(1, s, 0, "Route %s %s/%d%s%s\n", add ? "add" : "del",
451 fmtaddr(htonl(ip), 0), prefixlen,
452 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
453
454 if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
455 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
456
457 #ifdef BGP
458 if (add)
459 bgp_add_route(htonl(ip), prefixlen);
460 else
461 bgp_del_route(htonl(ip), prefixlen);
462 #endif /* BGP */
463
464 // Add/Remove the IPs to the 'sessionbyip' cache.
465 // Note that we add the zero address in the case of
466 // a network route. Roll on CIDR.
467
468 // Note that 's == 0' implies this is the address pool.
469 // We still cache it here, because it will pre-fill
470 // the malloc'ed tree.
471
472 if (s)
473 {
474 if (!add) // Are we deleting a route?
475 s = 0; // Caching the session as '0' is the same as uncaching.
476
477 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
478 cache_ipmap(i, s);
479 }
480 }
481
482 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
483 {
484 struct in6_rtmsg rt;
485 char ipv6addr[INET6_ADDRSTRLEN];
486
487 if (ifr6fd < 0)
488 {
489 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
490 return;
491 }
492
493 memset(&rt, 0, sizeof(rt));
494
495 memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
496 rt.rtmsg_dst_len = prefixlen;
497 rt.rtmsg_metric = 1;
498 rt.rtmsg_flags = RTF_UP;
499 rt.rtmsg_ifindex = tunidx;
500
501 LOG(1, 0, 0, "Route %s %s/%d\n",
502 add ? "add" : "del",
503 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
504 prefixlen);
505
506 if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
507 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
508 strerror(errno));
509
510 // FIXME: need to add BGP routing (RFC2858)
511
512 if (s)
513 {
514 if (!add) // Are we deleting a route?
515 s = 0; // Caching the session as '0' is the same as uncaching.
516
517 cache_ipv6map(ip, prefixlen, s);
518 }
519
520 return;
521 }
522
523 //
524 // Set up netlink socket
525 static void initnetlink(void)
526 {
527 struct sockaddr_nl nladdr;
528
529 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
530 if (nlfd < 0)
531 {
532 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
533 exit(1);
534 }
535
536 memset(&nladdr, 0, sizeof(nladdr));
537 nladdr.nl_family = AF_NETLINK;
538 nladdr.nl_pid = getpid();
539
540 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
541 {
542 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
543 exit(1);
544 }
545 }
546
547 static ssize_t netlink_send(struct nlmsghdr *nh)
548 {
549 struct sockaddr_nl nladdr;
550 struct iovec iov;
551 struct msghdr msg;
552
553 nh->nlmsg_pid = getpid();
554 nh->nlmsg_seq = ++nlseqnum;
555
556 // set kernel address
557 memset(&nladdr, 0, sizeof(nladdr));
558 nladdr.nl_family = AF_NETLINK;
559
560 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
561 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
562
563 return sendmsg(nlfd, &msg, 0);
564 }
565
566 static ssize_t netlink_recv(void *buf, ssize_t len)
567 {
568 struct sockaddr_nl nladdr;
569 struct iovec iov;
570 struct msghdr msg;
571
572 // set kernel address
573 memset(&nladdr, 0, sizeof(nladdr));
574 nladdr.nl_family = AF_NETLINK;
575
576 iov = (struct iovec){ buf, len };
577 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
578
579 return recvmsg(nlfd, &msg, 0);
580 }
581
582 /* adapted from iproute2 */
583 void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
584 {
585 int len = RTA_LENGTH(alen);
586 struct rtattr *rta;
587
588 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
589 rta->rta_type = type;
590 rta->rta_len = len;
591 memcpy(RTA_DATA(rta), data, alen);
592 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
593 }
594
595 // messages corresponding to different phases seq number
596 static char *tun_nl_phase_msg[] = {
597 "initialized",
598 "getting tun interface index",
599 "setting tun interface parameters",
600 "setting tun IPv4 address",
601 "setting tun LL IPv6 address",
602 "setting tun global IPv6 address",
603 };
604
605 //
606 // Set up TUN interface
607 static void inittun(void)
608 {
609 struct ifinfomsg ifinfo;
610 struct ifreq ifr;
611
612 memset(&ifr, 0, sizeof(ifr));
613 ifr.ifr_flags = IFF_TUN;
614
615 tunfd = open(TUNDEVICE, O_RDWR);
616 if (tunfd < 0)
617 { // fatal
618 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
619 exit(1);
620 }
621 {
622 int flags = fcntl(tunfd, F_GETFL, 0);
623 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
624 }
625 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
626 {
627 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
628 exit(1);
629 }
630 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
631 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
632
633 {
634 // get the interface index
635 struct {
636 struct nlmsghdr nh;
637 struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
638 struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
639 char ifname[IFNAMSIZ];
640 } req;
641 char buf[4096];
642 ssize_t len;
643 struct nlmsghdr *resp_nh;
644
645 req.nh.nlmsg_type = RTM_GETLINK;
646 req.nh.nlmsg_flags = NLM_F_REQUEST;
647 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
648
649 req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
650
651 netlink_addattr(&req.nh, IFLA_IFNAME, config->tundevice, strlen(config->tundevice)+1);
652
653 if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
654 {
655 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
656 exit(1);
657 }
658
659 resp_nh = (struct nlmsghdr *)buf;
660 if (!NLMSG_OK (resp_nh, len))
661 {
662 LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len);
663 exit(1);
664 }
665
666 memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
667 // got index
668 tunidx = ifinfo.ifi_index;
669 }
670 {
671 struct {
672 // interface setting
673 struct nlmsghdr nh;
674 union {
675 struct ifinfomsg ifinfo;
676 struct ifaddrmsg ifaddr;
677 } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
678 char rtdata[32]; // 32 should be enough
679 } req;
680 uint32_t txqlen, mtu;
681 struct in_addr ip;
682
683 memset(&req, 0, sizeof(req));
684
685 req.nh.nlmsg_type = RTM_SETLINK;
686 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
687 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
688
689 req.ifmsg.ifinfo = ifinfo;
690 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
691 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
692
693 /* Bump up the qlen to deal with bursts from the network */
694 txqlen = 1000;
695 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
696 /* set MTU to modem MRU */
697 mtu = MRU;
698 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
699
700 if (netlink_send(&req.nh) < 0)
701 goto senderror;
702
703 memset(&req, 0, sizeof(req));
704
705 req.nh.nlmsg_type = RTM_NEWADDR;
706 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
707 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
708
709 req.ifmsg.ifaddr.ifa_family = AF_INET;
710 req.ifmsg.ifaddr.ifa_prefixlen = 32;
711 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
712
713 if (config->bind_address)
714 ip.s_addr = config->bind_address;
715 else
716 ip.s_addr = 0x01010101, // 1.1.1.1
717 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
718
719 if (netlink_send(&req.nh) < 0)
720 goto senderror;
721
722 // Only setup IPv6 on the tun device if we have a configured prefix
723 if (config->ipv6_prefix.s6_addr[0]) {
724 struct in6_addr ip6;
725
726 memset(&req, 0, sizeof(req));
727
728 req.nh.nlmsg_type = RTM_NEWADDR;
729 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
730 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
731
732 req.ifmsg.ifaddr.ifa_family = AF_INET6;
733 req.ifmsg.ifaddr.ifa_prefixlen = 64;
734 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
735 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
736
737 // Link local address is FE80::1
738 memset(&ip6, 0, sizeof(ip6));
739 ip6.s6_addr[0] = 0xFE;
740 ip6.s6_addr[1] = 0x80;
741 ip6.s6_addr[15] = 1;
742 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
743
744 if (netlink_send(&req.nh) < 0)
745 goto senderror;
746
747 memset(&req, 0, sizeof(req));
748
749 req.nh.nlmsg_type = RTM_NEWADDR;
750 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
751 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
752
753 req.ifmsg.ifaddr.ifa_family = AF_INET6;
754 req.ifmsg.ifaddr.ifa_prefixlen = 64;
755 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
756 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
757
758 // Global address is prefix::1
759 ip6 = config->ipv6_prefix;
760 ip6.s6_addr[15] = 1;
761 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
762
763 if (netlink_send(&req.nh) < 0)
764 goto senderror;
765 }
766
767 memset(&req, 0, sizeof(req));
768
769 req.nh.nlmsg_type = NLMSG_DONE;
770 req.nh.nlmsg_len = NLMSG_LENGTH(0);
771
772 if (netlink_send(&req.nh) < 0)
773 goto senderror;
774
775 // if we get an error for seqnum < min_initok_nlseqnum,
776 // we must exit as initialization went wrong
777 if (config->ipv6_prefix.s6_addr[0])
778 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
779 else
780 min_initok_nlseqnum = 3 + 1; // idx + if + addr
781 }
782
783 return;
784
785 senderror:
786 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
787 exit(1);
788 }
789
790 // set up UDP ports
791 static void initudp(void)
792 {
793 int on = 1;
794 struct sockaddr_in addr;
795
796 // Tunnel
797 memset(&addr, 0, sizeof(addr));
798 addr.sin_family = AF_INET;
799 addr.sin_port = htons(L2TPPORT);
800 addr.sin_addr.s_addr = config->bind_address;
801 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
802 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
803 {
804 int flags = fcntl(udpfd, F_GETFL, 0);
805 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
806 }
807 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
808 {
809 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
810 exit(1);
811 }
812
813 // Control
814 memset(&addr, 0, sizeof(addr));
815 addr.sin_family = AF_INET;
816 addr.sin_port = htons(NSCTL_PORT);
817 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
818 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
819 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
820 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
821 {
822 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
823 exit(1);
824 }
825
826 // Dynamic Authorization Extensions to RADIUS
827 memset(&addr, 0, sizeof(addr));
828 addr.sin_family = AF_INET;
829 addr.sin_port = htons(config->radius_dae_port);
830 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
831 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
832 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
833 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
834 {
835 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
836 exit(1);
837 }
838
839 // Intercept
840 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
841 }
842
843 //
844 // Find session by IP, < 1 for not found
845 //
846 // Confusingly enough, this 'ip' must be
847 // in _network_ order. This being the common
848 // case when looking it up from IP packet headers.
849 //
850 // We actually use this cache for two things.
851 // #1. For used IP addresses, this maps to the
852 // session ID that it's used by.
853 // #2. For un-used IP addresses, this maps to the
854 // index into the pool table that contains that
855 // IP address.
856 //
857
858 static sessionidt lookup_ipmap(in_addr_t ip)
859 {
860 uint8_t *a = (uint8_t *) &ip;
861 union iphash *h = ip_hash;
862
863 if (!(h = h[*a++].idx)) return 0;
864 if (!(h = h[*a++].idx)) return 0;
865 if (!(h = h[*a++].idx)) return 0;
866
867 return h[*a].sess;
868 }
869
870 static sessionidt lookup_ipv6map(struct in6_addr ip)
871 {
872 struct ipv6radix *curnode;
873 int i;
874 int s;
875 char ipv6addr[INET6_ADDRSTRLEN];
876
877 curnode = &ipv6_hash[ip.s6_addr[0]];
878 i = 1;
879 s = curnode->sess;
880
881 while (s == 0 && i < 15 && curnode->branch != NULL)
882 {
883 curnode = &curnode->branch[ip.s6_addr[i]];
884 s = curnode->sess;
885 i++;
886 }
887
888 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
889 inet_ntop(AF_INET6, &ip, ipv6addr,
890 INET6_ADDRSTRLEN),
891 s);
892
893 return s;
894 }
895
896 sessionidt sessionbyip(in_addr_t ip)
897 {
898 sessionidt s = lookup_ipmap(ip);
899 CSTAT(sessionbyip);
900
901 if (s > 0 && s < MAXSESSION && session[s].opened)
902 return s;
903
904 return 0;
905 }
906
907 sessionidt sessionbyipv6(struct in6_addr ip)
908 {
909 sessionidt s;
910 CSTAT(sessionbyipv6);
911
912 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
913 (ip.s6_addr[0] == 0xFE &&
914 ip.s6_addr[1] == 0x80 &&
915 ip.s6_addr16[1] == 0 &&
916 ip.s6_addr16[2] == 0 &&
917 ip.s6_addr16[3] == 0)) {
918 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
919 } else {
920 s = lookup_ipv6map(ip);
921 }
922
923 if (s > 0 && s < MAXSESSION && session[s].opened)
924 return s;
925
926 return 0;
927 }
928
929 //
930 // Take an IP address in HOST byte order and
931 // add it to the sessionid by IP cache.
932 //
933 // (It's actually cached in network order)
934 //
935 static void cache_ipmap(in_addr_t ip, sessionidt s)
936 {
937 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
938 uint8_t *a = (uint8_t *) &nip;
939 union iphash *h = ip_hash;
940 int i;
941
942 for (i = 0; i < 3; i++)
943 {
944 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
945 return;
946
947 h = h[a[i]].idx;
948 }
949
950 h[a[3]].sess = s;
951
952 if (s > 0)
953 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
954
955 else if (s == 0)
956 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
957 // else a map to an ip pool index.
958 }
959
960 static void uncache_ipmap(in_addr_t ip)
961 {
962 cache_ipmap(ip, 0); // Assign it to the NULL session.
963 }
964
965 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
966 {
967 int i;
968 int bytes;
969 struct ipv6radix *curnode;
970 char ipv6addr[INET6_ADDRSTRLEN];
971
972 curnode = &ipv6_hash[ip.s6_addr[0]];
973
974 bytes = prefixlen >> 3;
975 i = 1;
976 while (i < bytes) {
977 if (curnode->branch == NULL)
978 {
979 if (!(curnode->branch = calloc(256,
980 sizeof (struct ipv6radix))))
981 return;
982 }
983 curnode = &curnode->branch[ip.s6_addr[i]];
984 i++;
985 }
986
987 curnode->sess = s;
988
989 if (s > 0)
990 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
991 inet_ntop(AF_INET6, &ip, ipv6addr,
992 INET6_ADDRSTRLEN),
993 prefixlen);
994 else if (s == 0)
995 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
996 inet_ntop(AF_INET6, &ip, ipv6addr,
997 INET6_ADDRSTRLEN),
998 prefixlen);
999 }
1000
1001 //
1002 // CLI list to dump current ipcache.
1003 //
1004 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1005 {
1006 union iphash *d = ip_hash, *e, *f, *g;
1007 int i, j, k, l;
1008 int count = 0;
1009
1010 if (CLI_HELP_REQUESTED)
1011 return CLI_HELP_NO_ARGS;
1012
1013 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1014
1015 for (i = 0; i < 256; ++i)
1016 {
1017 if (!d[i].idx)
1018 continue;
1019
1020 e = d[i].idx;
1021 for (j = 0; j < 256; ++j)
1022 {
1023 if (!e[j].idx)
1024 continue;
1025
1026 f = e[j].idx;
1027 for (k = 0; k < 256; ++k)
1028 {
1029 if (!f[k].idx)
1030 continue;
1031
1032 g = f[k].idx;
1033 for (l = 0; l < 256; ++l)
1034 {
1035 if (!g[l].sess)
1036 continue;
1037
1038 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1039 ++count;
1040 }
1041 }
1042 }
1043 }
1044 cli_print(cli, "%d entries in cache", count);
1045 return CLI_OK;
1046 }
1047
1048
1049 // Find session by username, 0 for not found
1050 // walled garden users aren't authenticated, so the username is
1051 // reasonably useless. Ignore them to avoid incorrect actions
1052 //
1053 // This is VERY inefficent. Don't call it often. :)
1054 //
1055 sessionidt sessionbyuser(char *username)
1056 {
1057 int s;
1058 CSTAT(sessionbyuser);
1059
1060 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1061 {
1062 if (!session[s].opened)
1063 continue;
1064
1065 if (session[s].walled_garden)
1066 continue; // Skip walled garden users.
1067
1068 if (!strncmp(session[s].user, username, 128))
1069 return s;
1070
1071 }
1072 return 0; // Not found.
1073 }
1074
1075 void send_garp(in_addr_t ip)
1076 {
1077 int s;
1078 struct ifreq ifr;
1079 uint8_t mac[6];
1080
1081 s = socket(PF_INET, SOCK_DGRAM, 0);
1082 if (s < 0)
1083 {
1084 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1085 return;
1086 }
1087 memset(&ifr, 0, sizeof(ifr));
1088 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1089 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1090 {
1091 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1092 close(s);
1093 return;
1094 }
1095 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1096 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1097 {
1098 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1099 close(s);
1100 return;
1101 }
1102 close(s);
1103 sendarp(ifr.ifr_ifindex, mac, ip);
1104 }
1105
1106 static sessiont *sessiontbysessionidt(sessionidt s)
1107 {
1108 if (!s || s >= MAXSESSION) return NULL;
1109 return &session[s];
1110 }
1111
1112 static sessionidt sessionidtbysessiont(sessiont *s)
1113 {
1114 sessionidt val = s-session;
1115 if (s < session || val >= MAXSESSION) return 0;
1116 return val;
1117 }
1118
1119 // actually send a control message for a specific tunnel
1120 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1121 {
1122 struct sockaddr_in addr;
1123
1124 CSTAT(tunnelsend);
1125
1126 if (!t)
1127 {
1128 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1129 STAT(tunnel_tx_errors);
1130 return;
1131 }
1132
1133 if (!tunnel[t].ip)
1134 {
1135 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1136 STAT(tunnel_tx_errors);
1137 return;
1138 }
1139
1140 memset(&addr, 0, sizeof(addr));
1141 addr.sin_family = AF_INET;
1142 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1143 addr.sin_port = htons(tunnel[t].port);
1144
1145 // sequence expected, if sequence in message
1146 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1147
1148 // If this is a control message, deal with retries
1149 if (*buf & 0x80)
1150 {
1151 tunnel[t].last = time_now; // control message sent
1152 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1153 if (tunnel[t].try)
1154 {
1155 STAT(tunnel_retries);
1156 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1157 }
1158 }
1159
1160 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1161 {
1162 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1163 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1164 STAT(tunnel_tx_errors);
1165 return;
1166 }
1167
1168 LOG_HEX(5, "Send Tunnel Data", buf, l);
1169 STAT(tunnel_tx_packets);
1170 INC_STAT(tunnel_tx_bytes, l);
1171 }
1172
1173 //
1174 // Tiny helper function to write data to
1175 // the 'tun' device.
1176 //
1177 int tun_write(uint8_t * data, int size)
1178 {
1179 return write(tunfd, data, size);
1180 }
1181
1182 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1183 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1184 {
1185 int d = (tcp[12] >> 4) * 4;
1186 uint8_t *mss = 0;
1187 uint8_t *opts;
1188 uint8_t *data;
1189 uint16_t orig;
1190 uint32_t sum;
1191
1192 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1193 return;
1194
1195 if (tcp + d > buf + len) // short?
1196 return;
1197
1198 opts = tcp + 20;
1199 data = tcp + d;
1200
1201 while (opts < data)
1202 {
1203 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1204 {
1205 mss = opts + 2;
1206 if (mss + 2 > data) return; // short?
1207 break;
1208 }
1209
1210 if (*opts == 0) return; // end of options
1211 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1212 opts++;
1213 else
1214 opts += opts[1]; // skip over option
1215 }
1216
1217 if (!mss) return; // not found
1218 orig = ntohs(*(uint16_t *) mss);
1219
1220 if (orig <= MSS) return; // mss OK
1221
1222 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1223 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1224 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1225 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1226
1227 // set mss
1228 *(int16_t *) mss = htons(MSS);
1229
1230 // adjust checksum (see rfc1141)
1231 sum = orig + (~MSS & 0xffff);
1232 sum += ntohs(*(uint16_t *) (tcp + 16));
1233 sum = (sum & 0xffff) + (sum >> 16);
1234 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1235 }
1236
1237 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1238 {
1239 uint16_t proto;
1240 if (extra) {
1241 // Skip the four extra bytes
1242 p += 4;
1243 l -= 4;
1244 }
1245
1246 if (*p & 1)
1247 {
1248 proto = *p++;
1249 l--;
1250 }
1251 else
1252 {
1253 proto = ntohs(*(uint16_t *) p);
1254 p += 2;
1255 l -= 2;
1256 }
1257 if (proto == PPPIP)
1258 {
1259 if (session[s].die)
1260 {
1261 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1262 return; // closing session, PPP not processed
1263 }
1264 session[s].last_packet = session[s].last_data = time_now;
1265 processipin(s, t, p, l);
1266 }
1267 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1268 {
1269 if (session[s].die)
1270 {
1271 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1272 return; // closing session, PPP not processed
1273 }
1274
1275 session[s].last_packet = session[s].last_data = time_now;
1276 processipv6in(s, t, p, l);
1277 }
1278 else if (proto == PPPIPCP)
1279 {
1280 session[s].last_packet = session[s].last_data = time_now;
1281 processipcp(s, t, p, l);
1282 }
1283 else if (proto == PPPCCP)
1284 {
1285 session[s].last_packet = session[s].last_data = time_now;
1286 processccp(s, t, p, l);
1287 }
1288 else
1289 {
1290 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1291 }
1292 }
1293
1294 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1295 {
1296 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1297 sp->cout_delta += len;
1298 sp->pout++;
1299 sp->last_data = time_now;
1300
1301 sess_local[s].cout += len; // To send to master..
1302 sess_local[s].pout++;
1303 }
1304
1305 // process outgoing (to tunnel) IP
1306 //
1307 static void processipout(uint8_t *buf, int len)
1308 {
1309 sessionidt s;
1310 sessiont *sp;
1311 tunnelidt t;
1312 in_addr_t ip;
1313
1314 uint8_t *data = buf; // Keep a copy of the originals.
1315 int size = len;
1316
1317 uint8_t fragbuf[MAXETHER + 20];
1318
1319 CSTAT(processipout);
1320
1321 if (len < MIN_IP_SIZE)
1322 {
1323 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1324 STAT(tun_rx_errors);
1325 return;
1326 }
1327 if (len >= MAXETHER)
1328 {
1329 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1330 STAT(tun_rx_errors);
1331 return;
1332 }
1333
1334 // Skip the tun header
1335 buf += 4;
1336 len -= 4;
1337
1338 // Got an IP header now
1339 if (*(uint8_t *)(buf) >> 4 != 4)
1340 {
1341 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1342 return;
1343 }
1344
1345 ip = *(uint32_t *)(buf + 16);
1346 if (!(s = sessionbyip(ip)))
1347 {
1348 // Is this a packet for a session that doesn't exist?
1349 static int rate = 0; // Number of ICMP packets we've sent this second.
1350 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1351
1352 if (last != time_now)
1353 {
1354 last = time_now;
1355 rate = 0;
1356 }
1357
1358 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1359 {
1360 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1361 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1362 config->bind_address ? config->bind_address : my_address, buf, len);
1363 }
1364 return;
1365 }
1366
1367 t = session[s].tunnel;
1368 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1369 {
1370 LOG(3, s, t, "Packet size more than session MRU\n");
1371 return;
1372 }
1373
1374 sp = &session[s];
1375
1376 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1377 if (config->max_packets > 0)
1378 {
1379 if (sess_local[s].last_packet_out == TIME)
1380 {
1381 int max = config->max_packets;
1382
1383 // All packets for throttled sessions are handled by the
1384 // master, so further limit by using the throttle rate.
1385 // A bit of a kludge, since throttle rate is in kbps,
1386 // but should still be generous given our average DSL
1387 // packet size is 200 bytes: a limit of 28kbps equates
1388 // to around 180 packets per second.
1389 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1390 max = sp->throttle_out;
1391
1392 if (++sess_local[s].packets_out > max)
1393 {
1394 sess_local[s].packets_dropped++;
1395 return;
1396 }
1397 }
1398 else
1399 {
1400 if (sess_local[s].packets_dropped)
1401 {
1402 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1403 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1404 sess_local[s].packets_dropped, sess_local[s].packets_out,
1405 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1406 sp->user);
1407 }
1408
1409 sess_local[s].last_packet_out = TIME;
1410 sess_local[s].packets_out = 1;
1411 sess_local[s].packets_dropped = 0;
1412 }
1413 }
1414
1415 // run access-list if any
1416 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1417 return;
1418
1419 // adjust MSS on SYN and SYN,ACK packets with options
1420 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1421 {
1422 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1423 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1424 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1425 }
1426
1427 if (sp->tbf_out)
1428 {
1429 // Are we throttling this session?
1430 if (config->cluster_iam_master)
1431 tbf_queue_packet(sp->tbf_out, data, size);
1432 else
1433 master_throttle_packet(sp->tbf_out, data, size);
1434 return;
1435 }
1436
1437 if (sp->walled_garden && !config->cluster_iam_master)
1438 {
1439 // We are walled-gardening this
1440 master_garden_packet(s, data, size);
1441 return;
1442 }
1443
1444 // Add on L2TP header
1445 {
1446 bundleidt bid = 0;
1447 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1448 {
1449 bid = session[s].bundle;
1450 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1451 t = session[s].tunnel;
1452 sp = &session[s];
1453 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1454 if(len > MINFRAGLEN)
1455 {
1456 // Partition the packet to "bundle[b].num_of_links" fragments
1457 bundlet *b = &bundle[bid];
1458 uint32_t num_of_links = b->num_of_links;
1459 uint32_t fraglen = len / num_of_links;
1460 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1461 uint32_t last_fraglen = fraglen + len % num_of_links;
1462 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1463 uint32_t remain = len;
1464
1465 // send the first packet
1466 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1467 if (!p) return;
1468 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1469 // statistics
1470 update_session_out_stat(s, sp, fraglen);
1471 remain -= fraglen;
1472 while (remain > last_fraglen)
1473 {
1474 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1475 t = session[s].tunnel;
1476 sp = &session[s];
1477 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1478 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1479 if (!p) return;
1480 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1481 update_session_out_stat(s, sp, fraglen);
1482 remain -= fraglen;
1483 }
1484 // send the last fragment
1485 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1486 t = session[s].tunnel;
1487 sp = &session[s];
1488 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1489 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1490 if (!p) return;
1491 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1492 update_session_out_stat(s, sp, remain);
1493 if (remain != last_fraglen)
1494 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1495 }
1496 else {
1497 // Send it as one frame
1498 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1499 if (!p) return;
1500 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1501 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1502 update_session_out_stat(s, sp, len);
1503 }
1504 }
1505 else
1506 {
1507 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1508 if (!p) return;
1509 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1510 update_session_out_stat(s, sp, len);
1511 }
1512 }
1513
1514 // Snooping this session, send it to intercept box
1515 if (sp->snoop_ip && sp->snoop_port)
1516 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1517
1518 udp_tx += len;
1519 }
1520
1521 // process outgoing (to tunnel) IPv6
1522 //
1523 static void processipv6out(uint8_t * buf, int len)
1524 {
1525 sessionidt s;
1526 sessiont *sp;
1527 tunnelidt t;
1528 in_addr_t ip;
1529 struct in6_addr ip6;
1530
1531 uint8_t *data = buf; // Keep a copy of the originals.
1532 int size = len;
1533
1534 uint8_t b[MAXETHER + 20];
1535
1536 CSTAT(processipv6out);
1537
1538 if (len < MIN_IP_SIZE)
1539 {
1540 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1541 STAT(tunnel_tx_errors);
1542 return;
1543 }
1544 if (len >= MAXETHER)
1545 {
1546 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1547 STAT(tunnel_tx_errors);
1548 return;
1549 }
1550
1551 // Skip the tun header
1552 buf += 4;
1553 len -= 4;
1554
1555 // Got an IP header now
1556 if (*(uint8_t *)(buf) >> 4 != 6)
1557 {
1558 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1559 return;
1560 }
1561
1562 ip6 = *(struct in6_addr *)(buf+24);
1563 s = sessionbyipv6(ip6);
1564
1565 if (s == 0)
1566 {
1567 ip = *(uint32_t *)(buf + 32);
1568 s = sessionbyip(ip);
1569 }
1570
1571 if (s == 0)
1572 {
1573 // Is this a packet for a session that doesn't exist?
1574 static int rate = 0; // Number of ICMP packets we've sent this second.
1575 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1576
1577 if (last != time_now)
1578 {
1579 last = time_now;
1580 rate = 0;
1581 }
1582
1583 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1584 {
1585 // FIXME: Should send icmp6 host unreachable
1586 }
1587 return;
1588 }
1589 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1590 {
1591 bundleidt bid = session[s].bundle;
1592 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1593 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1594 }
1595 t = session[s].tunnel;
1596 sp = &session[s];
1597 sp->last_data = time_now;
1598
1599 // FIXME: add DoS prevention/filters?
1600
1601 if (sp->tbf_out)
1602 {
1603 // Are we throttling this session?
1604 if (config->cluster_iam_master)
1605 tbf_queue_packet(sp->tbf_out, data, size);
1606 else
1607 master_throttle_packet(sp->tbf_out, data, size);
1608 return;
1609 }
1610 else if (sp->walled_garden && !config->cluster_iam_master)
1611 {
1612 // We are walled-gardening this
1613 master_garden_packet(s, data, size);
1614 return;
1615 }
1616
1617 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1618
1619 // Add on L2TP header
1620 {
1621 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1622 if (!p) return;
1623 tunnelsend(b, len + (p-b), t); // send it...
1624 }
1625
1626 // Snooping this session, send it to intercept box
1627 if (sp->snoop_ip && sp->snoop_port)
1628 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1629
1630 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1631 sp->cout_delta += len;
1632 sp->pout++;
1633 udp_tx += len;
1634
1635 sess_local[s].cout += len; // To send to master..
1636 sess_local[s].pout++;
1637 }
1638
1639 //
1640 // Helper routine for the TBF filters.
1641 // Used to send queued data in to the user!
1642 //
1643 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1644 {
1645 sessiont *sp;
1646 tunnelidt t;
1647 in_addr_t ip;
1648
1649 uint8_t b[MAXETHER + 20];
1650
1651 if (len < 0 || len > MAXETHER)
1652 {
1653 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1654 return;
1655 }
1656
1657 // Skip the tun header
1658 buf += 4;
1659 len -= 4;
1660
1661 ip = *(in_addr_t *)(buf + 16);
1662
1663 if (!session[s].ip)
1664 return;
1665
1666 t = session[s].tunnel;
1667 sp = &session[s];
1668
1669 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1670
1671 // Add on L2TP header
1672 {
1673 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1674 if (!p) return;
1675 tunnelsend(b, len + (p-b), t); // send it...
1676 }
1677
1678 // Snooping this session.
1679 if (sp->snoop_ip && sp->snoop_port)
1680 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1681
1682 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1683 sp->cout_delta += len;
1684 sp->pout++;
1685 udp_tx += len;
1686
1687 sess_local[s].cout += len; // To send to master..
1688 sess_local[s].pout++;
1689 }
1690
1691 // add an AVP (16 bit)
1692 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1693 {
1694 uint16_t l = (m ? 0x8008 : 0x0008);
1695 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1696 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1697 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1698 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1699 c->length += 8;
1700 }
1701
1702 // add an AVP (32 bit)
1703 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1704 {
1705 uint16_t l = (m ? 0x800A : 0x000A);
1706 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1707 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1708 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1709 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1710 c->length += 10;
1711 }
1712
1713 // add an AVP (string)
1714 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1715 {
1716 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1717 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1718 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1719 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1720 memcpy(c->buf + c->length + 6, val, strlen(val));
1721 c->length += 6 + strlen(val);
1722 }
1723
1724 // add a binary AVP
1725 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1726 {
1727 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1728 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1729 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1730 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1731 memcpy(c->buf + c->length + 6, val, len);
1732 c->length += 6 + len;
1733 }
1734
1735 // new control connection
1736 static controlt *controlnew(uint16_t mtype)
1737 {
1738 controlt *c;
1739 if (!controlfree)
1740 c = malloc(sizeof(controlt));
1741 else
1742 {
1743 c = controlfree;
1744 controlfree = c->next;
1745 }
1746 assert(c);
1747 c->next = 0;
1748 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1749 c->length = 12;
1750 control16(c, 0, mtype, 1);
1751 return c;
1752 }
1753
1754 // send zero block if nothing is waiting
1755 // (ZLB send).
1756 static void controlnull(tunnelidt t)
1757 {
1758 uint8_t buf[12];
1759 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1760 return;
1761
1762 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1763 *(uint16_t *) (buf + 2) = htons(12); // length
1764 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1765 *(uint16_t *) (buf + 6) = htons(0); // session
1766 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1767 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1768 tunnelsend(buf, 12, t);
1769 }
1770
1771 // add a control message to a tunnel, and send if within window
1772 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1773 {
1774 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1775 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1776 *(uint16_t *) (c->buf + 6) = htons(far); // session
1777 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1778 tunnel[t].ns++; // advance sequence
1779 // link in message in to queue
1780 if (tunnel[t].controlc)
1781 tunnel[t].controle->next = c;
1782 else
1783 tunnel[t].controls = c;
1784
1785 tunnel[t].controle = c;
1786 tunnel[t].controlc++;
1787
1788 // send now if space in window
1789 if (tunnel[t].controlc <= tunnel[t].window)
1790 {
1791 tunnel[t].try = 0; // first send
1792 tunnelsend(c->buf, c->length, t);
1793 }
1794 }
1795
1796 //
1797 // Throttle or Unthrottle a session
1798 //
1799 // Throttle the data from/to through a session to no more than
1800 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1801 // user).
1802 //
1803 // If either value is -1, the current value is retained for that
1804 // direction.
1805 //
1806 void throttle_session(sessionidt s, int rate_in, int rate_out)
1807 {
1808 if (!session[s].opened)
1809 return; // No-one home.
1810
1811 if (!*session[s].user)
1812 return; // User not logged in
1813
1814 if (rate_in >= 0)
1815 {
1816 int bytes = rate_in * 1024 / 8; // kbits to bytes
1817 if (session[s].tbf_in)
1818 free_tbf(session[s].tbf_in);
1819
1820 if (rate_in > 0)
1821 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1822 else
1823 session[s].tbf_in = 0;
1824
1825 session[s].throttle_in = rate_in;
1826 }
1827
1828 if (rate_out >= 0)
1829 {
1830 int bytes = rate_out * 1024 / 8;
1831 if (session[s].tbf_out)
1832 free_tbf(session[s].tbf_out);
1833
1834 if (rate_out > 0)
1835 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1836 else
1837 session[s].tbf_out = 0;
1838
1839 session[s].throttle_out = rate_out;
1840 }
1841 }
1842
1843 // add/remove filters from session (-1 = no change)
1844 void filter_session(sessionidt s, int filter_in, int filter_out)
1845 {
1846 if (!session[s].opened)
1847 return; // No-one home.
1848
1849 if (!*session[s].user)
1850 return; // User not logged in
1851
1852 // paranoia
1853 if (filter_in > MAXFILTER) filter_in = -1;
1854 if (filter_out > MAXFILTER) filter_out = -1;
1855 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1856 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1857
1858 if (filter_in >= 0)
1859 {
1860 if (session[s].filter_in)
1861 ip_filters[session[s].filter_in - 1].used--;
1862
1863 if (filter_in > 0)
1864 ip_filters[filter_in - 1].used++;
1865
1866 session[s].filter_in = filter_in;
1867 }
1868
1869 if (filter_out >= 0)
1870 {
1871 if (session[s].filter_out)
1872 ip_filters[session[s].filter_out - 1].used--;
1873
1874 if (filter_out > 0)
1875 ip_filters[filter_out - 1].used++;
1876
1877 session[s].filter_out = filter_out;
1878 }
1879 }
1880
1881 // start tidy shutdown of session
1882 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1883 {
1884 int walled_garden = session[s].walled_garden;
1885 bundleidt b = session[s].bundle;
1886 //delete routes only for last session in bundle (in case of MPPP)
1887 int del_routes = !b || (bundle[b].num_of_links == 1);
1888
1889 CSTAT(sessionshutdown);
1890
1891 if (!session[s].opened)
1892 {
1893 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1894 return; // not a live session
1895 }
1896
1897 if (!session[s].die)
1898 {
1899 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1900 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1901 run_plugins(PLUGIN_KILL_SESSION, &data);
1902 session[s].die = TIME + 150; // Clean up in 15 seconds
1903 }
1904
1905 if (session[s].ip && !walled_garden && !session[s].die)
1906 {
1907 // RADIUS Stop message
1908 uint16_t r = radiusnew(s);
1909 if (r)
1910 {
1911 // stop, if not already trying
1912 if (radius[r].state != RADIUSSTOP)
1913 {
1914 radius[r].term_cause = term_cause;
1915 radius[r].term_msg = reason;
1916 radiussend(r, RADIUSSTOP);
1917 }
1918 }
1919 else
1920 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1921
1922 // Save counters to dump to accounting file
1923 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1924 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1925 }
1926
1927 if (session[s].ip)
1928 { // IP allocated, clear and unroute
1929 int r;
1930 int routed = 0;
1931 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1932 {
1933 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
1934 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
1935 routed++;
1936
1937 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
1938 session[s].route[r].ip = 0;
1939 }
1940
1941 if (session[s].ip_pool_index == -1) // static ip
1942 {
1943 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1944 session[s].ip = 0;
1945 }
1946 else
1947 free_ip_address(s);
1948
1949 // unroute IPv6, if setup
1950 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1951 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1952
1953 if (b)
1954 {
1955 // This session was part of a bundle
1956 bundle[b].num_of_links--;
1957 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1958 if(bundle[b].num_of_links == 0)
1959 {
1960 bundleclear(b);
1961 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1962 }
1963 else
1964 {
1965 // Adjust the members array to accomodate the new change
1966 uint8_t mem_num = 0;
1967 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1968 if(bundle[b].members[bundle[b].num_of_links] != s)
1969 {
1970 uint8_t ml;
1971 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1972 if(bundle[b].members[ml] == s)
1973 {
1974 mem_num = ml;
1975 break;
1976 }
1977 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1978 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
1979 }
1980 }
1981 cluster_send_bundle(b);
1982 }
1983 }
1984
1985 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
1986 throttle_session(s, 0, 0);
1987
1988 if (cdn_result)
1989 { // Send CDN
1990 controlt *c = controlnew(14); // sending CDN
1991 if (cdn_error)
1992 {
1993 uint8_t buf[4];
1994 *(uint16_t *) buf = htons(cdn_result);
1995 *(uint16_t *) (buf+2) = htons(cdn_error);
1996 controlb(c, 1, buf, 4, 1);
1997 }
1998 else
1999 control16(c, 1, cdn_result, 1);
2000
2001 control16(c, 14, s, 1); // assigned session (our end)
2002 controladd(c, session[s].far, session[s].tunnel); // send the message
2003 }
2004
2005 // update filter refcounts
2006 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2007 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2008
2009 // clear PPP state
2010 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2011 sess_local[s].lcp.restart = 0;
2012 sess_local[s].ipcp.restart = 0;
2013 sess_local[s].ipv6cp.restart = 0;
2014 sess_local[s].ccp.restart = 0;
2015
2016 cluster_send_session(s);
2017 }
2018
2019 void sendipcp(sessionidt s, tunnelidt t)
2020 {
2021 uint8_t buf[MAXETHER];
2022 uint8_t *q;
2023
2024 CSTAT(sendipcp);
2025 LOG(3, s, t, "IPCP: send ConfigReq\n");
2026
2027 if (!session[s].unique_id)
2028 {
2029 if (!++last_id) ++last_id; // skip zero
2030 session[s].unique_id = last_id;
2031 }
2032
2033 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2034 if (!q) return;
2035
2036 *q = ConfigReq;
2037 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2038 *(uint16_t *) (q + 2) = htons(10); // packet length
2039 q[4] = 3; // ip address option
2040 q[5] = 6; // option length
2041 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2042 config->bind_address ? config->bind_address :
2043 my_address; // send my IP
2044
2045 tunnelsend(buf, 10 + (q - buf), t); // send it
2046 restart_timer(s, ipcp);
2047 }
2048
2049 void sendipv6cp(sessionidt s, tunnelidt t)
2050 {
2051 uint8_t buf[MAXETHER];
2052 uint8_t *q;
2053
2054 CSTAT(sendipv6cp);
2055 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2056
2057 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2058 if (!q) return;
2059
2060 *q = ConfigReq;
2061 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2062 // only send one type
2063 // of request
2064 *(uint16_t *) (q + 2) = htons(14);
2065 q[4] = 1; // interface identifier option
2066 q[5] = 10; // option length
2067 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2068 *(uint32_t *) (q + 10) = 0;
2069 q[13] = 1;
2070
2071 tunnelsend(buf, 14 + (q - buf), t); // send it
2072 restart_timer(s, ipv6cp);
2073 }
2074
2075 static void sessionclear(sessionidt s)
2076 {
2077 memset(&session[s], 0, sizeof(session[s]));
2078 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2079 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2080
2081 session[s].tunnel = T_FREE; // Mark it as free.
2082 session[s].next = sessionfree;
2083 sessionfree = s;
2084 }
2085
2086 // kill a session now
2087 void sessionkill(sessionidt s, char *reason)
2088 {
2089 CSTAT(sessionkill);
2090
2091 if (!session[s].opened) // not alive
2092 return;
2093
2094 if (session[s].next)
2095 {
2096 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2097 return;
2098 }
2099
2100 if (!session[s].die)
2101 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2102
2103 if (sess_local[s].radius)
2104 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2105
2106 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2107 sessionclear(s);
2108 cluster_send_session(s);
2109 }
2110
2111 static void tunnelclear(tunnelidt t)
2112 {
2113 if (!t) return;
2114 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2115 tunnel[t].state = TUNNELFREE;
2116 }
2117
2118 static void bundleclear(bundleidt b)
2119 {
2120 if (!b) return;
2121 memset(&bundle[b], 0, sizeof(bundle[b]));
2122 bundle[b].state = BUNDLEFREE;
2123 }
2124
2125 // kill a tunnel now
2126 static void tunnelkill(tunnelidt t, char *reason)
2127 {
2128 sessionidt s;
2129 controlt *c;
2130
2131 CSTAT(tunnelkill);
2132
2133 tunnel[t].state = TUNNELDIE;
2134
2135 // free control messages
2136 while ((c = tunnel[t].controls))
2137 {
2138 controlt * n = c->next;
2139 tunnel[t].controls = n;
2140 tunnel[t].controlc--;
2141 c->next = controlfree;
2142 controlfree = c;
2143 }
2144 // kill sessions
2145 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2146 if (session[s].tunnel == t)
2147 sessionkill(s, reason);
2148
2149 // free tunnel
2150 tunnelclear(t);
2151 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2152 cli_tunnel_actions[t].action = 0;
2153 cluster_send_tunnel(t);
2154 }
2155
2156 // shut down a tunnel cleanly
2157 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2158 {
2159 sessionidt s;
2160
2161 CSTAT(tunnelshutdown);
2162
2163 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2164 {
2165 // never set up, can immediately kill
2166 tunnelkill(t, reason);
2167 return;
2168 }
2169 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2170
2171 // close session
2172 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2173 if (session[s].tunnel == t)
2174 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2175
2176 tunnel[t].state = TUNNELDIE;
2177 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2178 cluster_send_tunnel(t);
2179 // TBA - should we wait for sessions to stop?
2180 if (result)
2181 {
2182 controlt *c = controlnew(4); // sending StopCCN
2183 if (error)
2184 {
2185 uint8_t buf[64];
2186 int l = 4;
2187 *(uint16_t *) buf = htons(result);
2188 *(uint16_t *) (buf+2) = htons(error);
2189 if (msg)
2190 {
2191 int m = strlen(msg);
2192 if (m + 4 > sizeof(buf))
2193 m = sizeof(buf) - 4;
2194
2195 memcpy(buf+4, msg, m);
2196 l += m;
2197 }
2198
2199 controlb(c, 1, buf, l, 1);
2200 }
2201 else
2202 control16(c, 1, result, 1);
2203
2204 control16(c, 9, t, 1); // assigned tunnel (our end)
2205 controladd(c, 0, t); // send the message
2206 }
2207 }
2208
2209 // read and process packet on tunnel (UDP)
2210 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2211 {
2212 uint8_t *chapresponse = NULL;
2213 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2214 uint8_t *p = buf + 2;
2215
2216
2217 CSTAT(processudp);
2218
2219 udp_rx += len;
2220 udp_rx_pkt++;
2221 LOG_HEX(5, "UDP Data", buf, len);
2222 STAT(tunnel_rx_packets);
2223 INC_STAT(tunnel_rx_bytes, len);
2224 if (len < 6)
2225 {
2226 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2227 STAT(tunnel_rx_errors);
2228 return;
2229 }
2230 if ((buf[1] & 0x0F) != 2)
2231 {
2232 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2233 STAT(tunnel_rx_errors);
2234 return;
2235 }
2236 if (*buf & 0x40)
2237 { // length
2238 l = ntohs(*(uint16_t *) p);
2239 p += 2;
2240 }
2241 t = ntohs(*(uint16_t *) p);
2242 p += 2;
2243 s = ntohs(*(uint16_t *) p);
2244 p += 2;
2245 if (s >= MAXSESSION)
2246 {
2247 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2248 STAT(tunnel_rx_errors);
2249 return;
2250 }
2251 if (t >= MAXTUNNEL)
2252 {
2253 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2254 STAT(tunnel_rx_errors);
2255 return;
2256 }
2257 if (*buf & 0x08)
2258 { // ns/nr
2259 ns = ntohs(*(uint16_t *) p);
2260 p += 2;
2261 nr = ntohs(*(uint16_t *) p);
2262 p += 2;
2263 }
2264 if (*buf & 0x02)
2265 { // offset
2266 uint16_t o = ntohs(*(uint16_t *) p);
2267 p += o + 2;
2268 }
2269 if ((p - buf) > l)
2270 {
2271 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2272 STAT(tunnel_rx_errors);
2273 return;
2274 }
2275 l -= (p - buf);
2276
2277 // used to time out old tunnels
2278 if (t && tunnel[t].state == TUNNELOPEN)
2279 tunnel[t].lastrec = time_now;
2280
2281 if (*buf & 0x80)
2282 { // control
2283 uint16_t message = 0xFFFF; // message type
2284 uint8_t fatal = 0;
2285 uint8_t mandatory = 0;
2286 uint16_t asession = 0; // assigned session
2287 uint32_t amagic = 0; // magic number
2288 uint8_t aflags = 0; // flags from last LCF
2289 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2290 char called[MAXTEL] = ""; // called number
2291 char calling[MAXTEL] = ""; // calling number
2292
2293 if (!config->cluster_iam_master)
2294 {
2295 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2296 return;
2297 }
2298
2299 // control messages must have bits 0x80|0x40|0x08
2300 // (type, length and sequence) set, and bits 0x02|0x01
2301 // (offset and priority) clear
2302 if ((*buf & 0xCB) != 0xC8)
2303 {
2304 LOG(1, s, t, "Bad control header %02X\n", *buf);
2305 STAT(tunnel_rx_errors);
2306 return;
2307 }
2308
2309 // check for duplicate tunnel open message
2310 if (!t && ns == 0)
2311 {
2312 int i;
2313
2314 //
2315 // Is this a duplicate of the first packet? (SCCRQ)
2316 //
2317 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2318 {
2319 if (tunnel[i].state != TUNNELOPENING ||
2320 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2321 tunnel[i].port != ntohs(addr->sin_port) )
2322 continue;
2323 t = i;
2324 LOG(3, s, t, "Duplicate SCCRQ?\n");
2325 break;
2326 }
2327 }
2328
2329 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2330 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2331
2332 // if no tunnel specified, assign one
2333 if (!t)
2334 {
2335 if (!(t = new_tunnel()))
2336 {
2337 LOG(1, 0, 0, "No more tunnels\n");
2338 STAT(tunnel_overflow);
2339 return;
2340 }
2341 tunnelclear(t);
2342 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2343 tunnel[t].port = ntohs(addr->sin_port);
2344 tunnel[t].window = 4; // default window
2345 STAT(tunnel_created);
2346 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2347 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2348 }
2349
2350 // If the 'ns' just received is not the 'nr' we're
2351 // expecting, just send an ack and drop it.
2352 //
2353 // if 'ns' is less, then we got a retransmitted packet.
2354 // if 'ns' is greater than missed a packet. Either way
2355 // we should ignore it.
2356 if (ns != tunnel[t].nr)
2357 {
2358 // is this the sequence we were expecting?
2359 STAT(tunnel_rx_errors);
2360 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2361 t, ns, tunnel[t].nr);
2362
2363 if (l) // Is this not a ZLB?
2364 controlnull(t);
2365 return;
2366 }
2367
2368 // check sequence of this message
2369 {
2370 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2371 // some to clear maybe?
2372 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2373 {
2374 controlt *c = tunnel[t].controls;
2375 tunnel[t].controls = c->next;
2376 tunnel[t].controlc--;
2377 c->next = controlfree;
2378 controlfree = c;
2379 skip--;
2380 tunnel[t].try = 0; // we have progress
2381 }
2382
2383 // receiver advance (do here so quoted correctly in any sends below)
2384 if (l) tunnel[t].nr = (ns + 1);
2385 if (skip < 0) skip = 0;
2386 if (skip < tunnel[t].controlc)
2387 {
2388 // some control packets can now be sent that were previous stuck out of window
2389 int tosend = tunnel[t].window - skip;
2390 controlt *c = tunnel[t].controls;
2391 while (c && skip)
2392 {
2393 c = c->next;
2394 skip--;
2395 }
2396 while (c && tosend)
2397 {
2398 tunnel[t].try = 0; // first send
2399 tunnelsend(c->buf, c->length, t);
2400 c = c->next;
2401 tosend--;
2402 }
2403 }
2404 if (!tunnel[t].controlc)
2405 tunnel[t].retry = 0; // caught up
2406 }
2407 if (l)
2408 { // if not a null message
2409 int result = 0;
2410 int error = 0;
2411 char *msg = 0;
2412
2413 // Default disconnect cause/message on receipt of CDN. Set to
2414 // more specific value from attribute 1 (result code) or 46
2415 // (disconnect cause) if present below.
2416 int disc_cause_set = 0;
2417 int disc_cause = TERM_NAS_REQUEST;
2418 char const *disc_reason = "Closed (Received CDN).";
2419
2420 // process AVPs
2421 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2422 {
2423 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2424 uint8_t *b = p;
2425 uint8_t flags = *p;
2426 uint16_t mtype;
2427
2428 if (n > l)
2429 {
2430 LOG(1, s, t, "Invalid length in AVP\n");
2431 STAT(tunnel_rx_errors);
2432 return;
2433 }
2434 p += n; // next
2435 l -= n;
2436 if (flags & 0x3C) // reserved bits, should be clear
2437 {
2438 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2439 fatal = flags;
2440 result = 2; // general error
2441 error = 3; // reserved field non-zero
2442 msg = 0;
2443 continue; // next
2444 }
2445 b += 2;
2446 if (*(uint16_t *) (b))
2447 {
2448 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2449 fatal = flags;
2450 result = 2; // general error
2451 error = 6; // generic vendor-specific error
2452 msg = "unsupported vendor-specific";
2453 continue; // next
2454 }
2455 b += 2;
2456 mtype = ntohs(*(uint16_t *) (b));
2457 b += 2;
2458 n -= 6;
2459
2460 if (flags & 0x40)
2461 {
2462 uint16_t orig_len;
2463
2464 // handle hidden AVPs
2465 if (!*config->l2tp_secret)
2466 {
2467 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2468 fatal = flags;
2469 result = 2; // general error
2470 error = 6; // generic vendor-specific error
2471 msg = "secret not specified";
2472 continue;
2473 }
2474 if (!session[s].random_vector_length)
2475 {
2476 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2477 fatal = flags;
2478 result = 2; // general error
2479 error = 6; // generic
2480 msg = "no random vector";
2481 continue;
2482 }
2483 if (n < 8)
2484 {
2485 LOG(2, s, t, "Short hidden AVP.\n");
2486 fatal = flags;
2487 result = 2; // general error
2488 error = 2; // length is wrong
2489 msg = 0;
2490 continue;
2491 }
2492
2493 // Unhide the AVP
2494 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2495
2496 orig_len = ntohs(*(uint16_t *) b);
2497 if (orig_len > n + 2)
2498 {
2499 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2500 orig_len, n);
2501
2502 fatal = flags;
2503 result = 2; // general error
2504 error = 2; // length is wrong
2505 msg = 0;
2506 continue;
2507 }
2508
2509 b += 2;
2510 n = orig_len;
2511 }
2512
2513 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2514 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2515
2516 switch (mtype)
2517 {
2518 case 0: // message type
2519 message = ntohs(*(uint16_t *) b);
2520 mandatory = flags & 0x80;
2521 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2522 break;
2523 case 1: // result code
2524 {
2525 uint16_t rescode = ntohs(*(uint16_t *) b);
2526 char const *resdesc = "(unknown)";
2527 char const *errdesc = NULL;
2528 int cause = 0;
2529
2530 if (message == 4)
2531 { /* StopCCN */
2532 resdesc = l2tp_stopccn_result_code(rescode);
2533 cause = TERM_LOST_SERVICE;
2534 }
2535 else if (message == 14)
2536 { /* CDN */
2537 resdesc = l2tp_cdn_result_code(rescode);
2538 if (rescode == 1)
2539 cause = TERM_LOST_CARRIER;
2540 else
2541 cause = TERM_ADMIN_RESET;
2542 }
2543
2544 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2545 if (n >= 4)
2546 {
2547 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2548 errdesc = l2tp_error_code(errcode);
2549 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2550 }
2551 if (n > 4)
2552 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2553
2554 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2555 {
2556 disc_cause_set = mtype;
2557 disc_reason = errdesc ? errdesc : resdesc;
2558 disc_cause = cause;
2559 }
2560
2561 break;
2562 }
2563 break;
2564 case 2: // protocol version
2565 {
2566 version = ntohs(*(uint16_t *) (b));
2567 LOG(4, s, t, " Protocol version = %u\n", version);
2568 if (version && version != 0x0100)
2569 { // allow 0.0 and 1.0
2570 LOG(1, s, t, " Bad protocol version %04X\n", version);
2571 fatal = flags;
2572 result = 5; // unspported protocol version
2573 error = 0x0100; // supported version
2574 msg = 0;
2575 continue; // next
2576 }
2577 }
2578 break;
2579 case 3: // framing capabilities
2580 break;
2581 case 4: // bearer capabilities
2582 break;
2583 case 5: // tie breaker
2584 // We never open tunnels, so we don't care about tie breakers
2585 continue;
2586 case 6: // firmware revision
2587 break;
2588 case 7: // host name
2589 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2590 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2591 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2592 // TBA - to send to RADIUS
2593 break;
2594 case 8: // vendor name
2595 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2596 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2597 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2598 break;
2599 case 9: // assigned tunnel
2600 tunnel[t].far = ntohs(*(uint16_t *) (b));
2601 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2602 break;
2603 case 10: // rx window
2604 tunnel[t].window = ntohs(*(uint16_t *) (b));
2605 if (!tunnel[t].window)
2606 tunnel[t].window = 1; // window of 0 is silly
2607 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2608 break;
2609 case 11: // Challenge
2610 {
2611 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2612 build_chap_response(b, 2, n, &chapresponse);
2613 }
2614 break;
2615 case 13: // Response
2616 // Why did they send a response? We never challenge.
2617 LOG(2, s, t, " received unexpected challenge response\n");
2618 break;
2619
2620 case 14: // assigned session
2621 asession = session[s].far = ntohs(*(uint16_t *) (b));
2622 LOG(4, s, t, " assigned session = %u\n", asession);
2623 break;
2624 case 15: // call serial number
2625 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2626 break;
2627 case 18: // bearer type
2628 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2629 // TBA - for RADIUS
2630 break;
2631 case 19: // framing type
2632 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2633 // TBA
2634 break;
2635 case 21: // called number
2636 memset(called, 0, sizeof(called));
2637 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2638 LOG(4, s, t, " Called <%s>\n", called);
2639 break;
2640 case 22: // calling number
2641 memset(calling, 0, sizeof(calling));
2642 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2643 LOG(4, s, t, " Calling <%s>\n", calling);
2644 break;
2645 case 23: // subtype
2646 break;
2647 case 24: // tx connect speed
2648 if (n == 4)
2649 {
2650 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2651 }
2652 else
2653 {
2654 // AS5300s send connect speed as a string
2655 char tmp[30];
2656 memset(tmp, 0, sizeof(tmp));
2657 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2658 session[s].tx_connect_speed = atol(tmp);
2659 }
2660 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2661 break;
2662 case 38: // rx connect speed
2663 if (n == 4)
2664 {
2665 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2666 }
2667 else
2668 {
2669 // AS5300s send connect speed as a string
2670 char tmp[30];
2671 memset(tmp, 0, sizeof(tmp));
2672 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2673 session[s].rx_connect_speed = atol(tmp);
2674 }
2675 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2676 break;
2677 case 25: // Physical Channel ID
2678 {
2679 uint32_t tmp = ntohl(*(uint32_t *) b);
2680 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2681 break;
2682 }
2683 case 29: // Proxy Authentication Type
2684 {
2685 uint16_t atype = ntohs(*(uint16_t *)b);
2686 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2687 break;
2688 }
2689 case 30: // Proxy Authentication Name
2690 {
2691 char authname[64];
2692 memset(authname, 0, sizeof(authname));
2693 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2694 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2695 authname);
2696 break;
2697 }
2698 case 31: // Proxy Authentication Challenge
2699 {
2700 LOG(4, s, t, " Proxy Auth Challenge\n");
2701 break;
2702 }
2703 case 32: // Proxy Authentication ID
2704 {
2705 uint16_t authid = ntohs(*(uint16_t *)(b));
2706 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2707 break;
2708 }
2709 case 33: // Proxy Authentication Response
2710 LOG(4, s, t, " Proxy Auth Response\n");
2711 break;
2712 case 27: // last sent lcp
2713 { // find magic number
2714 uint8_t *p = b, *e = p + n;
2715 while (p + 1 < e && p[1] && p + p[1] <= e)
2716 {
2717 if (*p == 5 && p[1] == 6) // Magic-Number
2718 amagic = ntohl(*(uint32_t *) (p + 2));
2719 else if (*p == 7) // Protocol-Field-Compression
2720 aflags |= SESSION_PFC;
2721 else if (*p == 8) // Address-and-Control-Field-Compression
2722 aflags |= SESSION_ACFC;
2723 p += p[1];
2724 }
2725 }
2726 break;
2727 case 28: // last recv lcp confreq
2728 break;
2729 case 26: // Initial Received LCP CONFREQ
2730 break;
2731 case 39: // seq required - we control it as an LNS anyway...
2732 break;
2733 case 36: // Random Vector
2734 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2735 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2736 if (n > sizeof(session[s].random_vector))
2737 n = sizeof(session[s].random_vector);
2738 memcpy(session[s].random_vector, b, n);
2739 session[s].random_vector_length = n;
2740 break;
2741 case 46: // ppp disconnect cause
2742 if (n >= 5)
2743 {
2744 uint16_t code = ntohs(*(uint16_t *) b);
2745 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2746 uint8_t dir = *(b + 4);
2747
2748 LOG(4, s, t, " PPP disconnect cause "
2749 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2750 code, proto, dir, n - 5, b + 5);
2751
2752 disc_cause_set = mtype;
2753
2754 switch (code)
2755 {
2756 case 1: // admin disconnect
2757 disc_cause = TERM_ADMIN_RESET;
2758 disc_reason = "Administrative disconnect";
2759 break;
2760 case 3: // lcp terminate
2761 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2762 disc_cause = TERM_USER_REQUEST;
2763 disc_reason = "Normal disconnection";
2764 break;
2765 case 4: // compulsory encryption unavailable
2766 if (dir != 1) break; // 1=refused by peer, 2=local
2767 disc_cause = TERM_USER_ERROR;
2768 disc_reason = "Compulsory encryption refused";
2769 break;
2770 case 5: // lcp: fsm timeout
2771 disc_cause = TERM_PORT_ERROR;
2772 disc_reason = "LCP: FSM timeout";
2773 break;
2774 case 6: // lcp: no recognisable lcp packets received
2775 disc_cause = TERM_PORT_ERROR;
2776 disc_reason = "LCP: no recognisable LCP packets";
2777 break;
2778 case 7: // lcp: magic-no error (possibly looped back)
2779 disc_cause = TERM_PORT_ERROR;
2780 disc_reason = "LCP: magic-no error (possible loop)";
2781 break;
2782 case 8: // lcp: echo request timeout
2783 disc_cause = TERM_PORT_ERROR;
2784 disc_reason = "LCP: echo request timeout";
2785 break;
2786 case 13: // auth: fsm timeout
2787 disc_cause = TERM_SERVICE_UNAVAILABLE;
2788 disc_reason = "Authentication: FSM timeout";
2789 break;
2790 case 15: // auth: unacceptable auth protocol
2791 disc_cause = TERM_SERVICE_UNAVAILABLE;
2792 disc_reason = "Unacceptable authentication protocol";
2793 break;
2794 case 16: // auth: authentication failed
2795 disc_cause = TERM_SERVICE_UNAVAILABLE;
2796 disc_reason = "Authentication failed";
2797 break;
2798 case 17: // ncp: fsm timeout
2799 disc_cause = TERM_SERVICE_UNAVAILABLE;
2800 disc_reason = "NCP: FSM timeout";
2801 break;
2802 case 18: // ncp: no ncps available
2803 disc_cause = TERM_SERVICE_UNAVAILABLE;
2804 disc_reason = "NCP: no NCPs available";
2805 break;
2806 case 19: // ncp: failure to converge on acceptable address
2807 disc_cause = TERM_SERVICE_UNAVAILABLE;
2808 disc_reason = (dir == 1)
2809 ? "NCP: too many Configure-Naks received from peer"
2810 : "NCP: too many Configure-Naks sent to peer";
2811 break;
2812 case 20: // ncp: user not permitted to use any address
2813 disc_cause = TERM_SERVICE_UNAVAILABLE;
2814 disc_reason = (dir == 1)
2815 ? "NCP: local link address not acceptable to peer"
2816 : "NCP: remote link address not acceptable";
2817 break;
2818 }
2819 }
2820 break;
2821 default:
2822 {
2823 static char e[] = "unknown AVP 0xXXXX";
2824 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2825 fatal = flags;
2826 result = 2; // general error
2827 error = 8; // unknown mandatory AVP
2828 sprintf((msg = e) + 14, "%04x", mtype);
2829 continue; // next
2830 }
2831 }
2832 }
2833 // process message
2834 if (fatal & 0x80)
2835 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2836 else
2837 switch (message)
2838 {
2839 case 1: // SCCRQ - Start Control Connection Request
2840 tunnel[t].state = TUNNELOPENING;
2841 if (main_quit != QUIT_SHUTDOWN)
2842 {
2843 controlt *c = controlnew(2); // sending SCCRP
2844 control16(c, 2, version, 1); // protocol version
2845 control32(c, 3, 3, 1); // framing
2846 controls(c, 7, hostname, 1); // host name
2847 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2848 control16(c, 9, t, 1); // assigned tunnel
2849 controladd(c, 0, t); // send the resply
2850 }
2851 else
2852 {
2853 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2854 }
2855 break;
2856 case 2: // SCCRP
2857 tunnel[t].state = TUNNELOPEN;
2858 tunnel[t].lastrec = time_now;
2859 break;
2860 case 3: // SCCN
2861 tunnel[t].state = TUNNELOPEN;
2862 tunnel[t].lastrec = time_now;
2863 controlnull(t); // ack
2864 break;
2865 case 4: // StopCCN
2866 controlnull(t); // ack
2867 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2868 break;
2869 case 6: // HELLO
2870 controlnull(t); // simply ACK
2871 break;
2872 case 7: // OCRQ
2873 // TBA
2874 break;
2875 case 8: // OCRO
2876 // TBA
2877 break;
2878 case 9: // OCCN
2879 // TBA
2880 break;
2881 case 10: // ICRQ
2882 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2883 {
2884 controlt *c = controlnew(11); // ICRP
2885
2886 s = sessionfree;
2887 sessionfree = session[s].next;
2888 memset(&session[s], 0, sizeof(session[s]));
2889
2890 if (s > config->cluster_highest_sessionid)
2891 config->cluster_highest_sessionid = s;
2892
2893 session[s].opened = time_now;
2894 session[s].tunnel = t;
2895 session[s].far = asession;
2896 session[s].last_packet = session[s].last_data = time_now;
2897 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2898 control16(c, 14, s, 1); // assigned session
2899 controladd(c, asession, t); // send the reply
2900
2901 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2902 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2903
2904 session[s].ppp.phase = Establish;
2905 session[s].ppp.lcp = Starting;
2906
2907 STAT(session_created);
2908 break;
2909 }
2910
2911 {
2912 controlt *c = controlnew(14); // CDN
2913 if (!sessionfree)
2914 {
2915 STAT(session_overflow);
2916 LOG(1, 0, t, "No free sessions\n");
2917 control16(c, 1, 4, 0); // temporary lack of resources
2918 }
2919 else
2920 control16(c, 1, 2, 7); // shutting down, try another
2921
2922 controladd(c, asession, t); // send the message
2923 }
2924 return;
2925 case 11: // ICRP
2926 // TBA
2927 break;
2928 case 12: // ICCN
2929 if (amagic == 0) amagic = time_now;
2930 session[s].magic = amagic; // set magic number
2931 session[s].flags = aflags; // set flags received
2932 session[s].mru = PPPoE_MRU; // default
2933 controlnull(t); // ack
2934
2935 // start LCP
2936 sess_local[s].lcp_authtype = config->radius_authprefer;
2937 sess_local[s].ppp_mru = MRU;
2938
2939 // Set multilink options before sending initial LCP packet
2940 sess_local[s].mp_mrru = 1614;
2941 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2942
2943 sendlcp(s, t);
2944 change_state(s, lcp, RequestSent);
2945 break;
2946
2947 case 14: // CDN
2948 controlnull(t); // ack
2949 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2950 break;
2951 case 0xFFFF:
2952 LOG(1, s, t, "Missing message type\n");
2953 break;
2954 default:
2955 STAT(tunnel_rx_errors);
2956 if (mandatory)
2957 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2958 else
2959 LOG(1, s, t, "Unknown message type %u\n", message);
2960 break;
2961 }
2962 if (chapresponse) free(chapresponse);
2963 cluster_send_tunnel(t);
2964 }
2965 else
2966 {
2967 LOG(4, s, t, " Got a ZLB ack\n");
2968 }
2969 }
2970 else
2971 { // data
2972 uint16_t proto;
2973
2974 LOG_HEX(5, "Receive Tunnel Data", p, l);
2975 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2976 { // HDLC address header, discard
2977 p += 2;
2978 l -= 2;
2979 }
2980 if (l < 2)
2981 {
2982 LOG(1, s, t, "Short ppp length %d\n", l);
2983 STAT(tunnel_rx_errors);
2984 return;
2985 }
2986 if (*p & 1)
2987 {
2988 proto = *p++;
2989 l--;
2990 }
2991 else
2992 {
2993 proto = ntohs(*(uint16_t *) p);
2994 p += 2;
2995 l -= 2;
2996 }
2997
2998 if (s && !session[s].opened) // Is something wrong??
2999 {
3000 if (!config->cluster_iam_master)
3001 {
3002 // Pass it off to the master to deal with..
3003 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3004 return;
3005 }
3006
3007
3008 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3009 STAT(tunnel_rx_errors);
3010 return;
3011 }
3012
3013 if (proto == PPPPAP)
3014 {
3015 session[s].last_packet = time_now;
3016 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3017 processpap(s, t, p, l);
3018 }
3019 else if (proto == PPPCHAP)
3020 {
3021 session[s].last_packet = time_now;
3022 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3023 processchap(s, t, p, l);
3024 }
3025 else if (proto == PPPLCP)
3026 {
3027 session[s].last_packet = time_now;
3028 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3029 processlcp(s, t, p, l);
3030 }
3031 else if (proto == PPPIPCP)
3032 {
3033 session[s].last_packet = time_now;
3034 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3035 processipcp(s, t, p, l);
3036 }
3037 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3038 {
3039 session[s].last_packet = time_now;
3040 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3041 processipv6cp(s, t, p, l);
3042 }
3043 else if (proto == PPPCCP)
3044 {
3045 session[s].last_packet = time_now;
3046 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3047 processccp(s, t, p, l);
3048 }
3049 else if (proto == PPPIP)
3050 {
3051 if (session[s].die)
3052 {
3053 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3054 return; // closing session, PPP not processed
3055 }
3056
3057 session[s].last_packet = session[s].last_data = time_now;
3058 if (session[s].walled_garden && !config->cluster_iam_master)
3059 {
3060 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3061 return;
3062 }
3063
3064 processipin(s, t, p, l);
3065 }
3066 else if (proto == PPPMP)
3067 {
3068 if (session[s].die)
3069 {
3070 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3071 return; // closing session, PPP not processed
3072 }
3073
3074 session[s].last_packet = session[s].last_data = time_now;
3075 if (session[s].walled_garden && !config->cluster_iam_master)
3076 {
3077 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3078 return;
3079 }
3080
3081 processmpin(s, t, p, l);
3082 }
3083 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3084 {
3085 if (session[s].die)
3086 {
3087 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3088 return; // closing session, PPP not processed
3089 }
3090
3091 session[s].last_packet = session[s].last_data = time_now;
3092 if (session[s].walled_garden && !config->cluster_iam_master)
3093 {
3094 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3095 return;
3096 }
3097
3098 processipv6in(s, t, p, l);
3099 }
3100 else if (session[s].ppp.lcp == Opened)
3101 {
3102 session[s].last_packet = time_now;
3103 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3104 protoreject(s, t, p, l, proto);
3105 }
3106 else
3107 {
3108 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3109 proto, ppp_state(session[s].ppp.lcp));
3110 }
3111 }
3112 }
3113
3114 // read and process packet on tun
3115 static void processtun(uint8_t * buf, int len)
3116 {
3117 LOG_HEX(5, "Receive TUN Data", buf, len);
3118 STAT(tun_rx_packets);
3119 INC_STAT(tun_rx_bytes, len);
3120
3121 CSTAT(processtun);
3122
3123 eth_rx_pkt++;
3124 eth_rx += len;
3125 if (len < 22)
3126 {
3127 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3128 STAT(tun_rx_errors);
3129 return;
3130 }
3131
3132 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3133 processipout(buf, len);
3134 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3135 && config->ipv6_prefix.s6_addr[0])
3136 processipv6out(buf, len);
3137
3138 // Else discard.
3139 }
3140
3141 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3142 // that we look at the whole of the tunnel, radius and session tables
3143 // every second
3144 static void regular_cleanups(double period)
3145 {
3146 // Next tunnel, radius and session to check for actions on.
3147 static tunnelidt t = 0;
3148 static int r = 0;
3149 static sessionidt s = 0;
3150
3151 int t_actions = 0;
3152 int r_actions = 0;
3153 int s_actions = 0;
3154
3155 int t_slice;
3156 int r_slice;
3157 int s_slice;
3158
3159 int i;
3160 int a;
3161
3162 // divide up tables into slices based on the last run
3163 t_slice = config->cluster_highest_tunnelid * period;
3164 r_slice = (MAXRADIUS - 1) * period;
3165 s_slice = config->cluster_highest_sessionid * period;
3166
3167 if (t_slice < 1)
3168 t_slice = 1;
3169 else if (t_slice > config->cluster_highest_tunnelid)
3170 t_slice = config->cluster_highest_tunnelid;
3171
3172 if (r_slice < 1)
3173 r_slice = 1;
3174 else if (r_slice > (MAXRADIUS - 1))
3175 r_slice = MAXRADIUS - 1;
3176
3177 if (s_slice < 1)
3178 s_slice = 1;
3179 else if (s_slice > config->cluster_highest_sessionid)
3180 s_slice = config->cluster_highest_sessionid;
3181
3182 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3183
3184 for (i = 0; i < t_slice; i++)
3185 {
3186 t++;
3187 if (t > config->cluster_highest_tunnelid)
3188 t = 1;
3189
3190 // check for expired tunnels
3191 if (tunnel[t].die && tunnel[t].die <= TIME)
3192 {
3193 STAT(tunnel_timeout);
3194 tunnelkill(t, "Expired");
3195 t_actions++;
3196 continue;
3197 }
3198 // check for message resend
3199 if (tunnel[t].retry && tunnel[t].controlc)
3200 {
3201 // resend pending messages as timeout on reply
3202 if (tunnel[t].retry <= TIME)
3203 {
3204 controlt *c = tunnel[t].controls;
3205 uint16_t w = tunnel[t].window;
3206 tunnel[t].try++; // another try
3207 if (tunnel[t].try > 5)
3208 tunnelkill(t, "Timeout on control message"); // game over
3209 else
3210 while (c && w--)
3211 {
3212 tunnelsend(c->buf, c->length, t);
3213 c = c->next;
3214 }
3215
3216 t_actions++;
3217 }
3218 }
3219 // Send hello
3220 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3221 {
3222 controlt *c = controlnew(6); // sending HELLO
3223 controladd(c, 0, t); // send the message
3224 LOG(3, 0, t, "Sending HELLO message\n");
3225 t_actions++;
3226 }
3227
3228 // Check for tunnel changes requested from the CLI
3229 if ((a = cli_tunnel_actions[t].action))
3230 {
3231 cli_tunnel_actions[t].action = 0;
3232 if (a & CLI_TUN_KILL)
3233 {
3234 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3235 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3236 t_actions++;
3237 }
3238 }
3239 }
3240
3241 for (i = 0; i < r_slice; i++)
3242 {
3243 r++;
3244 if (r >= MAXRADIUS)
3245 r = 1;
3246
3247 if (!radius[r].state)
3248 continue;
3249
3250 if (radius[r].retry <= TIME)
3251 {
3252 radiusretry(r);
3253 r_actions++;
3254 }
3255 }
3256
3257 for (i = 0; i < s_slice; i++)
3258 {
3259 s++;
3260 if (s > config->cluster_highest_sessionid)
3261 s = 1;
3262
3263 if (!session[s].opened) // Session isn't in use
3264 continue;
3265
3266 // check for expired sessions
3267 if (session[s].die)
3268 {
3269 if (session[s].die <= TIME)
3270 {
3271 sessionkill(s, "Expired");
3272 s_actions++;
3273 }
3274 continue;
3275 }
3276
3277 // PPP timeouts
3278 if (sess_local[s].lcp.restart <= time_now)
3279 {
3280 int next_state = session[s].ppp.lcp;
3281 switch (session[s].ppp.lcp)
3282 {
3283 case RequestSent:
3284 case AckReceived:
3285 next_state = RequestSent;
3286
3287 case AckSent:
3288 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3289 {
3290 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3291 sendlcp(s, session[s].tunnel);
3292 change_state(s, lcp, next_state);
3293 }
3294 else
3295 {
3296 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3297 STAT(session_timeout);
3298 }
3299
3300 s_actions++;
3301 }
3302
3303 if (session[s].die)
3304 continue;
3305 }
3306
3307 if (sess_local[s].ipcp.restart <= time_now)
3308 {
3309 int next_state = session[s].ppp.ipcp;
3310 switch (session[s].ppp.ipcp)
3311 {
3312 case RequestSent:
3313 case AckReceived:
3314 next_state = RequestSent;
3315
3316 case AckSent:
3317 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3318 {
3319 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3320 sendipcp(s, session[s].tunnel);
3321 change_state(s, ipcp, next_state);
3322 }
3323 else
3324 {
3325 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3326 STAT(session_timeout);
3327 }
3328
3329 s_actions++;
3330 }
3331
3332 if (session[s].die)
3333 continue;
3334 }
3335
3336 if (sess_local[s].ipv6cp.restart <= time_now)
3337 {
3338 int next_state = session[s].ppp.ipv6cp;
3339 switch (session[s].ppp.ipv6cp)
3340 {
3341 case RequestSent:
3342 case AckReceived:
3343 next_state = RequestSent;
3344
3345 case AckSent:
3346 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3347 {
3348 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3349 sendipv6cp(s, session[s].tunnel);
3350 change_state(s, ipv6cp, next_state);
3351 }
3352 else
3353 {
3354 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3355 change_state(s, ipv6cp, Stopped);
3356 }
3357
3358 s_actions++;
3359 }
3360 }
3361
3362 if (sess_local[s].ccp.restart <= time_now)
3363 {
3364 int next_state = session[s].ppp.ccp;
3365 switch (session[s].ppp.ccp)
3366 {
3367 case RequestSent:
3368 case AckReceived:
3369 next_state = RequestSent;
3370
3371 case AckSent:
3372 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3373 {
3374 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3375 sendccp(s, session[s].tunnel);
3376 change_state(s, ccp, next_state);
3377 }
3378 else
3379 {
3380 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3381 change_state(s, ccp, Stopped);
3382 }
3383
3384 s_actions++;
3385 }
3386 }
3387
3388 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3389 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3390 {
3391 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3392 STAT(session_timeout);
3393 s_actions++;
3394 continue;
3395 }
3396
3397 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3398 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3399 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3400 {
3401 uint8_t b[MAXETHER];
3402
3403 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3404 if (!q) continue;
3405
3406 *q = EchoReq;
3407 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3408 *(uint16_t *)(q + 2) = htons(8); // Length
3409 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3410
3411 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3412 (int)(time_now - session[s].last_packet));
3413 tunnelsend(b, 24, session[s].tunnel); // send it
3414 sess_local[s].last_echo = time_now;
3415 s_actions++;
3416 }
3417
3418 // Drop sessions who have reached session_timeout seconds
3419 if (session[s].session_timeout)
3420 {
3421 bundleidt bid = session[s].bundle;
3422 if (bid)
3423 {
3424 if (time_now - bundle[bid].last_check >= 1)
3425 {
3426 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3427 bundle[bid].last_check = time_now;
3428 if (bundle[bid].online_time >= session[s].session_timeout)
3429 {
3430 int ses;
3431 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3432 {
3433 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3434 s_actions++;
3435 continue;
3436 }
3437 }
3438 }
3439 }
3440 else if (time_now - session[s].opened >= session[s].session_timeout)
3441 {
3442 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3443 s_actions++;
3444 continue;
3445 }
3446 }
3447
3448 // Drop sessions who have reached idle_timeout seconds
3449 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3450 {
3451 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3452 STAT(session_timeout);
3453 s_actions++;
3454 continue;
3455 }
3456
3457 // Check for actions requested from the CLI
3458 if ((a = cli_session_actions[s].action))
3459 {
3460 int send = 0;
3461
3462 cli_session_actions[s].action = 0;
3463 if (a & CLI_SESS_KILL)
3464 {
3465 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3466 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3467 a = 0; // dead, no need to check for other actions
3468 s_actions++;
3469 }
3470
3471 if (a & CLI_SESS_NOSNOOP)
3472 {
3473 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3474 session[s].snoop_ip = 0;
3475 session[s].snoop_port = 0;
3476 s_actions++;
3477 send++;
3478 }
3479 else if (a & CLI_SESS_SNOOP)
3480 {
3481 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3482 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3483 cli_session_actions[s].snoop_port);
3484
3485 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3486 session[s].snoop_port = cli_session_actions[s].snoop_port;
3487 s_actions++;
3488 send++;
3489 }
3490
3491 if (a & CLI_SESS_NOTHROTTLE)
3492 {
3493 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3494 throttle_session(s, 0, 0);
3495 s_actions++;
3496 send++;
3497 }
3498 else if (a & CLI_SESS_THROTTLE)
3499 {
3500 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3501 cli_session_actions[s].throttle_in,
3502 cli_session_actions[s].throttle_out);
3503
3504 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3505 s_actions++;
3506 send++;
3507 }
3508
3509 if (a & CLI_SESS_NOFILTER)
3510 {
3511 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3512 filter_session(s, 0, 0);
3513 s_actions++;
3514 send++;
3515 }
3516 else if (a & CLI_SESS_FILTER)
3517 {
3518 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3519 cli_session_actions[s].filter_in,
3520 cli_session_actions[s].filter_out);
3521
3522 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3523 s_actions++;
3524 send++;
3525 }
3526
3527 if (send)
3528 cluster_send_session(s);
3529 }
3530
3531 // RADIUS interim accounting
3532 if (config->radius_accounting && config->radius_interim > 0
3533 && session[s].ip && !session[s].walled_garden
3534 && !sess_local[s].radius // RADIUS already in progress
3535 && time_now - sess_local[s].last_interim >= config->radius_interim
3536 && session[s].flags & SESSION_STARTED)
3537 {
3538 int rad = radiusnew(s);
3539 if (!rad)
3540 {
3541 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3542 STAT(radius_overflow);
3543 continue;
3544 }
3545
3546 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3547 session[s].user, session[s].unique_id);
3548
3549 radiussend(rad, RADIUSINTERIM);
3550 sess_local[s].last_interim = time_now;
3551 s_actions++;
3552 }
3553 }
3554
3555 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3556 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3557 }
3558
3559 //
3560 // Are we in the middle of a tunnel update, or radius
3561 // requests??
3562 //
3563 static int still_busy(void)
3564 {
3565 int i;
3566 static clockt last_talked = 0;
3567 static clockt start_busy_wait = 0;
3568
3569 if (!config->cluster_iam_master)
3570 {
3571 #ifdef BGP
3572 static time_t stopped_bgp = 0;
3573 if (bgp_configured)
3574 {
3575 if (!stopped_bgp)
3576 {
3577 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3578
3579 for (i = 0; i < BGP_NUM_PEERS; i++)
3580 if (bgp_peers[i].state == Established)
3581 bgp_stop(&bgp_peers[i]);
3582
3583 stopped_bgp = time_now;
3584
3585 // we don't want to become master
3586 cluster_send_ping(0);
3587
3588 return 1;
3589 }
3590
3591 if (time_now < (stopped_bgp + QUIT_DELAY))
3592 return 1;
3593 }
3594 #endif /* BGP */
3595
3596 return 0;
3597 }
3598
3599 if (main_quit == QUIT_SHUTDOWN)
3600 {
3601 static int dropped = 0;
3602 if (!dropped)
3603 {
3604 int i;
3605
3606 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3607 for (i = 1; i < MAXTUNNEL; i++)
3608 if (tunnel[i].ip || tunnel[i].state)
3609 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3610
3611 dropped = 1;
3612 }
3613 }
3614
3615 if (start_busy_wait == 0)
3616 start_busy_wait = TIME;
3617
3618 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3619 {
3620 if (!tunnel[i].controlc)
3621 continue;
3622
3623 if (last_talked != TIME)
3624 {
3625 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3626 last_talked = TIME;
3627 }
3628 return 1;
3629 }
3630
3631 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3632 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3633 {
3634 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3635 return 0;
3636 }
3637
3638 for (i = 1; i < MAXRADIUS; i++)
3639 {
3640 if (radius[i].state == RADIUSNULL)
3641 continue;
3642 if (radius[i].state == RADIUSWAIT)
3643 continue;
3644
3645 if (last_talked != TIME)
3646 {
3647 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3648 last_talked = TIME;
3649 }
3650 return 1;
3651 }
3652
3653 return 0;
3654 }
3655
3656 #ifdef HAVE_EPOLL
3657 # include <sys/epoll.h>
3658 #else
3659 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3660 # include "fake_epoll.h"
3661 #endif
3662
3663 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3664 #define BASE_FDS 7
3665
3666 // additional polled fds
3667 #ifdef BGP
3668 # define EXTRA_FDS BGP_NUM_PEERS
3669 #else
3670 # define EXTRA_FDS 0
3671 #endif
3672
3673 // main loop - gets packets on tun or udp and processes them
3674 static void mainloop(void)
3675 {
3676 int i;
3677 uint8_t buf[65536];
3678 clockt next_cluster_ping = 0; // send initial ping immediately
3679 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3680 int maxevent = sizeof(events)/sizeof(*events);
3681
3682 if ((epollfd = epoll_create(maxevent)) < 0)
3683 {
3684 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3685 exit(1);
3686 }
3687
3688 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3689 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3690
3691 /* setup our fds to poll for input */
3692 {
3693 static struct event_data d[BASE_FDS];
3694 struct epoll_event e;
3695
3696 e.events = EPOLLIN;
3697 i = 0;
3698
3699 if (clifd >= 0)
3700 {
3701 d[i].type = FD_TYPE_CLI;
3702 e.data.ptr = &d[i++];
3703 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3704 }
3705
3706 d[i].type = FD_TYPE_CLUSTER;
3707 e.data.ptr = &d[i++];
3708 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3709
3710 d[i].type = FD_TYPE_TUN;
3711 e.data.ptr = &d[i++];
3712 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3713
3714 d[i].type = FD_TYPE_UDP;
3715 e.data.ptr = &d[i++];
3716 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3717
3718 d[i].type = FD_TYPE_CONTROL;
3719 e.data.ptr = &d[i++];
3720 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3721
3722 d[i].type = FD_TYPE_DAE;
3723 e.data.ptr = &d[i++];
3724 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3725
3726 d[i].type = FD_TYPE_NETLINK;
3727 e.data.ptr = &d[i++];
3728 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3729 }
3730
3731 #ifdef BGP
3732 signal(SIGPIPE, SIG_IGN);
3733 bgp_setup(config->as_number);
3734 if (config->bind_address)
3735 bgp_add_route(config->bind_address, 0xffffffff);
3736
3737 for (i = 0; i < BGP_NUM_PEERS; i++)
3738 {
3739 if (config->neighbour[i].name[0])
3740 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3741 config->neighbour[i].as, config->neighbour[i].keepalive,
3742 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3743 }
3744 #endif /* BGP */
3745
3746 while (!main_quit || still_busy())
3747 {
3748 int more = 0;
3749 int n;
3750
3751
3752 if (main_reload)
3753 {
3754 main_reload = 0;
3755 read_config_file();
3756 config->reload_config++;
3757 }
3758
3759 if (config->reload_config)
3760 {
3761 config->reload_config = 0;
3762 update_config();
3763 }
3764
3765 #ifdef BGP
3766 bgp_set_poll();
3767 #endif /* BGP */
3768
3769 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3770 STAT(select_called);
3771
3772 TIME = now(NULL);
3773 if (n < 0)
3774 {
3775 if (errno == EINTR ||
3776 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3777 continue;
3778
3779 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3780 break; // exit
3781 }
3782
3783 if (n)
3784 {
3785 struct sockaddr_in addr;
3786 struct in_addr local;
3787 socklen_t alen;
3788 int c, s;
3789 int udp_ready = 0;
3790 int tun_ready = 0;
3791 int cluster_ready = 0;
3792 int udp_pkts = 0;
3793 int tun_pkts = 0;
3794 int cluster_pkts = 0;
3795 #ifdef BGP
3796 uint32_t bgp_events[BGP_NUM_PEERS];
3797 memset(bgp_events, 0, sizeof(bgp_events));
3798 #endif /* BGP */
3799
3800 for (c = n, i = 0; i < c; i++)
3801 {
3802 struct event_data *d = events[i].data.ptr;
3803
3804 switch (d->type)
3805 {
3806 case FD_TYPE_CLI: // CLI connections
3807 {
3808 int cli;
3809
3810 alen = sizeof(addr);
3811 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3812 {
3813 cli_do(cli);
3814 close(cli);
3815 }
3816 else
3817 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3818
3819 n--;
3820 break;
3821 }
3822
3823 // these are handled below, with multiple interleaved reads
3824 case FD_TYPE_CLUSTER: cluster_ready++; break;
3825 case FD_TYPE_TUN: tun_ready++; break;
3826 case FD_TYPE_UDP: udp_ready++; break;
3827
3828 case FD_TYPE_CONTROL: // nsctl commands
3829 alen = sizeof(addr);
3830 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3831 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3832 n--;
3833 break;
3834
3835 case FD_TYPE_DAE: // DAE requests
3836 alen = sizeof(addr);
3837 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3838 if (s > 0) processdae(buf, s, &addr, alen, &local);
3839 n--;
3840 break;
3841
3842 case FD_TYPE_RADIUS: // RADIUS response
3843 alen = sizeof(addr);
3844 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3845 if (s >= 0 && config->cluster_iam_master)
3846 {
3847 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3848 addr.sin_addr.s_addr == config->radiusserver[1])
3849 processrad(buf, s, d->index);
3850 else
3851 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3852 fmtaddr(addr.sin_addr.s_addr, 0));
3853 }
3854
3855 n--;
3856 break;
3857
3858 #ifdef BGP
3859 case FD_TYPE_BGP:
3860 bgp_events[d->index] = events[i].events;
3861 n--;
3862 break;
3863 #endif /* BGP */
3864
3865 case FD_TYPE_NETLINK:
3866 {
3867 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
3868 s = netlink_recv(buf, sizeof(buf));
3869 if (nh->nlmsg_type == NLMSG_ERROR)
3870 {
3871 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
3872 if (errmsg->error)
3873 {
3874 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
3875 {
3876 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
3877 exit(1);
3878 }
3879 else
3880
3881 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
3882 }
3883 // else it's a ack
3884 }
3885 else
3886 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);
3887 n--;
3888 break;
3889 }
3890
3891 default:
3892 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3893 }
3894 }
3895
3896 #ifdef BGP
3897 bgp_process(bgp_events);
3898 #endif /* BGP */
3899
3900 for (c = 0; n && c < config->multi_read_count; c++)
3901 {
3902 // L2TP
3903 if (udp_ready)
3904 {
3905 alen = sizeof(addr);
3906 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3907 {
3908 processudp(buf, s, &addr);
3909 udp_pkts++;
3910 }
3911 else
3912 {
3913 udp_ready = 0;
3914 n--;
3915 }
3916 }
3917
3918 // incoming IP
3919 if (tun_ready)
3920 {
3921 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3922 {
3923 processtun(buf, s);
3924 tun_pkts++;
3925 }
3926 else
3927 {
3928 tun_ready = 0;
3929 n--;
3930 }
3931 }
3932
3933 // cluster
3934 if (cluster_ready)
3935 {
3936 alen = sizeof(addr);
3937 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3938 {
3939 processcluster(buf, s, addr.sin_addr.s_addr);
3940 cluster_pkts++;
3941 }
3942 else
3943 {
3944 cluster_ready = 0;
3945 n--;
3946 }
3947 }
3948 }
3949
3950 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3951 STAT(multi_read_used);
3952
3953 if (c >= config->multi_read_count)
3954 {
3955 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3956 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3957
3958 STAT(multi_read_exceeded);
3959 more++;
3960 }
3961 }
3962
3963 if (time_changed)
3964 {
3965 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3966
3967 // Log current traffic stats
3968 snprintf(config->bandwidth, sizeof(config->bandwidth),
3969 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3970 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3971 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
3972 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
3973
3974 udp_tx = udp_rx = 0;
3975 udp_rx_pkt = eth_rx_pkt = 0;
3976 eth_tx = eth_rx = 0;
3977 time_changed = 0;
3978
3979 if (config->dump_speed)
3980 printf("%s\n", config->bandwidth);
3981
3982 // Update the internal time counter
3983 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3984
3985 {
3986 // Run timer hooks
3987 struct param_timer p = { time_now };
3988 run_plugins(PLUGIN_TIMER, &p);
3989 }
3990 }
3991
3992 // Runs on every machine (master and slaves).
3993 if (next_cluster_ping <= TIME)
3994 {
3995 // Check to see which of the cluster is still alive..
3996
3997 cluster_send_ping(basetime); // Only does anything if we're a slave
3998 cluster_check_master(); // ditto.
3999
4000 cluster_heartbeat(); // Only does anything if we're a master.
4001 cluster_check_slaves(); // ditto.
4002
4003 master_update_counts(); // If we're a slave, send our byte counters to our master.
4004
4005 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4006 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4007 else
4008 next_cluster_ping = TIME + config->cluster_hb_interval;
4009 }
4010
4011 if (!config->cluster_iam_master)
4012 continue;
4013
4014 // Run token bucket filtering queue..
4015 // Only run it every 1/10th of a second.
4016 {
4017 static clockt last_run = 0;
4018 if (last_run != TIME)
4019 {
4020 last_run = TIME;
4021 tbf_run_timer();
4022 }
4023 }
4024
4025 // Handle timeouts, retries etc.
4026 {
4027 static double last_clean = 0;
4028 double this_clean;
4029 double diff;
4030
4031 TIME = now(&this_clean);
4032 diff = this_clean - last_clean;
4033
4034 // Run during idle time (after we've handled
4035 // all incoming packets) or every 1/10th sec
4036 if (!more || diff > 0.1)
4037 {
4038 regular_cleanups(diff);
4039 last_clean = this_clean;
4040 }
4041 }
4042
4043 if (*config->accounting_dir)
4044 {
4045 static clockt next_acct = 0;
4046 static clockt next_shut_acct = 0;
4047
4048 if (next_acct <= TIME)
4049 {
4050 // Dump accounting data
4051 next_acct = TIME + ACCT_TIME;
4052 next_shut_acct = TIME + ACCT_SHUT_TIME;
4053 dump_acct_info(1);
4054 }
4055 else if (next_shut_acct <= TIME)
4056 {
4057 // Dump accounting data for shutdown sessions
4058 next_shut_acct = TIME + ACCT_SHUT_TIME;
4059 if (shut_acct_n)
4060 dump_acct_info(0);
4061 }
4062 }
4063 }
4064
4065 // Are we the master and shutting down??
4066 if (config->cluster_iam_master)
4067 cluster_heartbeat(); // Flush any queued changes..
4068
4069 // Ok. Notify everyone we're shutting down. If we're
4070 // the master, this will force an election.
4071 cluster_send_ping(0);
4072
4073 //
4074 // Important!!! We MUST not process any packets past this point!
4075 LOG(1, 0, 0, "Shutdown complete\n");
4076 }
4077
4078 static void stripdomain(char *host)
4079 {
4080 char *p;
4081
4082 if ((p = strchr(host, '.')))
4083 {
4084 char *domain = 0;
4085 char _domain[1024];
4086
4087 // strip off domain
4088 FILE *resolv = fopen("/etc/resolv.conf", "r");
4089 if (resolv)
4090 {
4091 char buf[1024];
4092 char *b;
4093
4094 while (fgets(buf, sizeof(buf), resolv))
4095 {
4096 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4097 continue;
4098
4099 if (!isspace(buf[6]))
4100 continue;
4101
4102 b = buf + 7;
4103 while (isspace(*b)) b++;
4104
4105 if (*b)
4106 {
4107 char *d = b;
4108 while (*b && !isspace(*b)) b++;
4109 *b = 0;
4110 if (buf[0] == 'd') // domain is canonical
4111 {
4112 domain = d;
4113 break;
4114 }
4115
4116 // first search line
4117 if (!domain)
4118 {
4119 // hold, may be subsequent domain line
4120 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4121 domain = _domain;
4122 }
4123 }
4124 }
4125
4126 fclose(resolv);
4127 }
4128
4129 if (domain)
4130 {
4131 int hl = strlen(host);
4132 int dl = strlen(domain);
4133 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4134 host[hl -dl - 1] = 0;
4135 }
4136 else
4137 {
4138 *p = 0; // everything after first dot
4139 }
4140 }
4141 }
4142
4143 // Init data structures
4144 static void initdata(int optdebug, char *optconfig)
4145 {
4146 int i;
4147
4148 if (!(config = shared_malloc(sizeof(configt))))
4149 {
4150 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4151 exit(1);
4152 }
4153
4154 memset(config, 0, sizeof(configt));
4155 time(&config->start_time);
4156 strncpy(config->config_file, optconfig, strlen(optconfig));
4157 config->debug = optdebug;
4158 config->num_tbfs = MAXTBFS;
4159 config->rl_rate = 28; // 28kbps
4160 config->cluster_mcast_ttl = 1;
4161 config->cluster_master_min_adv = 1;
4162 config->ppp_restart_time = 3;
4163 config->ppp_max_configure = 10;
4164 config->ppp_max_failure = 5;
4165 config->kill_timedout_sessions = 1;
4166 strcpy(config->random_device, RANDOMDEVICE);
4167
4168 log_stream = stderr;
4169
4170 #ifdef RINGBUFFER
4171 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4172 {
4173 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4174 exit(1);
4175 }
4176 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4177 #endif
4178
4179 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4180 {
4181 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4182 exit(1);
4183 }
4184 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4185 {
4186 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4187 exit(1);
4188 }
4189 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4190 {
4191 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4192 exit(1);
4193 }
4194 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4195 {
4196 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4197 exit(1);
4198 }
4199 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4200 {
4201 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4202 exit(1);
4203 }
4204
4205 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4206 {
4207 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4208 exit(1);
4209 }
4210
4211 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4212 {
4213 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4214 exit(1);
4215 }
4216
4217 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4218 {
4219 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4220 exit(1);
4221 }
4222
4223 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4224 {
4225 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4226 exit(1);
4227 }
4228 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4229
4230 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4231 {
4232 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4233 exit(1);
4234 }
4235 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4236
4237 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4238 {
4239 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4240 exit(1);
4241 }
4242 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4243
4244 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4245 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4246 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4247 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4248 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4249
4250 // Put all the sessions on the free list marked as undefined.
4251 for (i = 1; i < MAXSESSION; i++)
4252 {
4253 session[i].next = i + 1;
4254 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4255 }
4256 session[MAXSESSION - 1].next = 0;
4257 sessionfree = 1;
4258
4259 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4260 for (i = 1; i < MAXTUNNEL; i++)
4261 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4262
4263 for (i = 1; i < MAXBUNDLE; i++) {
4264 bundle[i].state = BUNDLEUNDEF;
4265 }
4266
4267 if (!*hostname)
4268 {
4269 // Grab my hostname unless it's been specified
4270 gethostname(hostname, sizeof(hostname));
4271 stripdomain(hostname);
4272 }
4273
4274 _statistics->start_time = _statistics->last_reset = time(NULL);
4275
4276 #ifdef BGP
4277 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4278 {
4279 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4280 exit(1);
4281 }
4282 #endif /* BGP */
4283 }
4284
4285 static int assign_ip_address(sessionidt s)
4286 {
4287 uint32_t i;
4288 int best = -1;
4289 time_t best_time = time_now;
4290 char *u = session[s].user;
4291 char reuse = 0;
4292
4293
4294 CSTAT(assign_ip_address);
4295
4296 for (i = 1; i < ip_pool_size; i++)
4297 {
4298 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4299 continue;
4300
4301 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4302 {
4303 best = i;
4304 reuse = 1;
4305 break;
4306 }
4307
4308 if (ip_address_pool[i].last < best_time)
4309 {
4310 best = i;
4311 if (!(best_time = ip_address_pool[i].last))
4312 break; // never used, grab this one
4313 }
4314 }
4315
4316 if (best < 0)
4317 {
4318 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4319 return 0;
4320 }
4321
4322 session[s].ip = ip_address_pool[best].address;
4323 session[s].ip_pool_index = best;
4324 ip_address_pool[best].assigned = 1;
4325 ip_address_pool[best].last = time_now;
4326 ip_address_pool[best].session = s;
4327 if (session[s].walled_garden)
4328 /* Don't track addresses of users in walled garden (note: this
4329 means that their address isn't "sticky" even if they get
4330 un-gardened). */
4331 ip_address_pool[best].user[0] = 0;
4332 else
4333 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4334
4335 STAT(ip_allocated);
4336 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4337 reuse ? "Reusing" : "Allocating", best);
4338
4339 return 1;
4340 }
4341
4342 static void free_ip_address(sessionidt s)
4343 {
4344 int i = session[s].ip_pool_index;
4345
4346
4347 CSTAT(free_ip_address);
4348
4349 if (!session[s].ip)
4350 return; // what the?
4351
4352 if (i < 0) // Is this actually part of the ip pool?
4353 i = 0;
4354
4355 STAT(ip_freed);
4356 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4357 session[s].ip = 0;
4358 ip_address_pool[i].assigned = 0;
4359 ip_address_pool[i].session = 0;
4360 ip_address_pool[i].last = time_now;
4361 }
4362
4363 //
4364 // Fsck the address pool against the session table.
4365 // Normally only called when we become a master.
4366 //
4367 // This isn't perfect: We aren't keep tracking of which
4368 // users used to have an IP address.
4369 //
4370 void rebuild_address_pool(void)
4371 {
4372 int i;
4373
4374 //
4375 // Zero the IP pool allocation, and build
4376 // a map from IP address to pool index.
4377 for (i = 1; i < MAXIPPOOL; ++i)
4378 {
4379 ip_address_pool[i].assigned = 0;
4380 ip_address_pool[i].session = 0;
4381 if (!ip_address_pool[i].address)
4382 continue;
4383
4384 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4385 }
4386
4387 for (i = 0; i < MAXSESSION; ++i)
4388 {
4389 int ipid;
4390 if (!(session[i].opened && session[i].ip))
4391 continue;
4392
4393 ipid = - lookup_ipmap(htonl(session[i].ip));
4394
4395 if (session[i].ip_pool_index < 0)
4396 {
4397 // Not allocated out of the pool.
4398 if (ipid < 1) // Not found in the pool either? good.
4399 continue;
4400
4401 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4402 i, fmtaddr(session[i].ip, 0), ipid);
4403
4404 // Fall through and process it as part of the pool.
4405 }
4406
4407
4408 if (ipid > MAXIPPOOL || ipid < 0)
4409 {
4410 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4411 ipid = -1;
4412 session[i].ip_pool_index = ipid;
4413 continue;
4414 }
4415
4416 ip_address_pool[ipid].assigned = 1;
4417 ip_address_pool[ipid].session = i;
4418 ip_address_pool[ipid].last = time_now;
4419 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4420 session[i].ip_pool_index = ipid;
4421 cache_ipmap(session[i].ip, i); // Fix the ip map.
4422 }
4423 }
4424
4425 //
4426 // Fix the address pool to match a changed session.
4427 // (usually when the master sends us an update).
4428 static void fix_address_pool(int sid)
4429 {
4430 int ipid;
4431
4432 ipid = session[sid].ip_pool_index;
4433
4434 if (ipid > ip_pool_size)
4435 return; // Ignore it. rebuild_address_pool will fix it up.
4436
4437 if (ip_address_pool[ipid].address != session[sid].ip)
4438 return; // Just ignore it. rebuild_address_pool will take care of it.
4439
4440 ip_address_pool[ipid].assigned = 1;
4441 ip_address_pool[ipid].session = sid;
4442 ip_address_pool[ipid].last = time_now;
4443 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4444 }
4445
4446 //
4447 // Add a block of addresses to the IP pool to hand out.
4448 //
4449 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4450 {
4451 int i;
4452 if (prefixlen == 0)
4453 prefixlen = 32; // Host route only.
4454
4455 addr &= 0xffffffff << (32 - prefixlen);
4456
4457 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4458 return ;
4459
4460 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4461 {
4462 if ((i & 0xff) == 0 || (i&0xff) == 255)
4463 continue; // Skip 0 and broadcast addresses.
4464
4465 ip_address_pool[ip_pool_size].address = i;
4466 ip_address_pool[ip_pool_size].assigned = 0;
4467 ++ip_pool_size;
4468 if (ip_pool_size >= MAXIPPOOL)
4469 {
4470 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4471 return;
4472 }
4473 }
4474 }
4475
4476 // Initialize the IP address pool
4477 static void initippool()
4478 {
4479 FILE *f;
4480 char *p;
4481 char buf[4096];
4482 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4483
4484 if (!(f = fopen(IPPOOLFILE, "r")))
4485 {
4486 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4487 exit(1);
4488 }
4489
4490 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4491 {
4492 char *pool = buf;
4493 buf[4095] = 0; // Force it to be zero terminated/
4494
4495 if (*buf == '#' || *buf == '\n')
4496 continue; // Skip comments / blank lines
4497 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4498 if ((p = (char *)strchr(buf, ':')))
4499 {
4500 in_addr_t src;
4501 *p = '\0';
4502 src = inet_addr(buf);
4503 if (src == INADDR_NONE)
4504 {
4505 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4506 exit(1);
4507 }
4508 // This entry is for a specific IP only
4509 if (src != config->bind_address)
4510 continue;
4511 *p = ':';
4512 pool = p+1;
4513 }
4514 if ((p = (char *)strchr(pool, '/')))
4515 {
4516 // It's a range
4517 int numbits = 0;
4518 in_addr_t start = 0;
4519
4520 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4521 *p++ = 0;
4522 if (!*p || !(numbits = atoi(p)))
4523 {
4524 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4525 continue;
4526 }
4527 start = ntohl(inet_addr(pool));
4528
4529 // Add a static route for this pool
4530 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4531 fmtaddr(htonl(start), 0), numbits);
4532
4533 routeset(0, start, numbits, 0, 1);
4534
4535 add_to_ip_pool(start, numbits);
4536 }
4537 else
4538 {
4539 // It's a single ip address
4540 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4541 }
4542 }
4543 fclose(f);
4544 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4545 }
4546
4547 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4548 {
4549 struct sockaddr_in snoop_addr = {0};
4550 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4551 return;
4552
4553 snoop_addr.sin_family = AF_INET;
4554 snoop_addr.sin_addr.s_addr = destination;
4555 snoop_addr.sin_port = ntohs(port);
4556
4557 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4558 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4559 htons(snoop_addr.sin_port));
4560
4561 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4562 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4563
4564 STAT(packets_snooped);
4565 }
4566
4567 static int dump_session(FILE **f, sessiont *s)
4568 {
4569 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4570 return 1;
4571
4572 if (!*f)
4573 {
4574 char filename[1024];
4575 char timestr[64];
4576 time_t now = time(NULL);
4577
4578 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4579 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4580
4581 if (!(*f = fopen(filename, "w")))
4582 {
4583 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4584 return 0;
4585 }
4586
4587 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4588 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4589 "# host: %s\n"
4590 "# endpoint: %s\n"
4591 "# time: %ld\n"
4592 "# uptime: %ld\n"
4593 "# format: username ip qos uptxoctets downrxoctets\n",
4594 hostname,
4595 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4596 now,
4597 now - basetime);
4598 }
4599
4600 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4601 fprintf(*f, "%s %s %d %u %u\n",
4602 s->user, // username
4603 fmtaddr(htonl(s->ip), 0), // ip
4604 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4605 (uint32_t) s->cin_delta, // uptxoctets
4606 (uint32_t) s->cout_delta); // downrxoctets
4607
4608 s->cin_delta = s->cout_delta = 0;
4609
4610 return 1;
4611 }
4612
4613 static void dump_acct_info(int all)
4614 {
4615 int i;
4616 FILE *f = NULL;
4617
4618
4619 CSTAT(dump_acct_info);
4620
4621 if (shut_acct_n)
4622 {
4623 for (i = 0; i < shut_acct_n; i++)
4624 dump_session(&f, &shut_acct[i]);
4625
4626 shut_acct_n = 0;
4627 }
4628
4629 if (all)
4630 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4631 dump_session(&f, &session[i]);
4632
4633 if (f)
4634 fclose(f);
4635 }
4636
4637 // Main program
4638 int main(int argc, char *argv[])
4639 {
4640 int i;
4641 int optdebug = 0;
4642 char *optconfig = CONFIGFILE;
4643
4644 time(&basetime); // start clock
4645
4646 // scan args
4647 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4648 {
4649 switch (i)
4650 {
4651 case 'd':
4652 if (fork()) exit(0);
4653 setsid();
4654 freopen("/dev/null", "r", stdin);
4655 freopen("/dev/null", "w", stdout);
4656 freopen("/dev/null", "w", stderr);
4657 break;
4658 case 'v':
4659 optdebug++;
4660 break;
4661 case 'c':
4662 optconfig = optarg;
4663 break;
4664 case 'h':
4665 snprintf(hostname, sizeof(hostname), "%s", optarg);
4666 break;
4667 default:
4668 printf("Args are:\n"
4669 "\t-d\t\tDetach from terminal\n"
4670 "\t-c <file>\tConfig file\n"
4671 "\t-h <hostname>\tForce hostname\n"
4672 "\t-v\t\tDebug\n");
4673
4674 return (0);
4675 break;
4676 }
4677 }
4678
4679 // Start the timer routine off
4680 time(&time_now);
4681 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4682
4683 initplugins();
4684 initdata(optdebug, optconfig);
4685
4686 init_cli(hostname);
4687 read_config_file();
4688 update_config();
4689 init_tbf(config->num_tbfs);
4690
4691 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4692 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4693 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4694 {
4695 struct rlimit rlim;
4696 rlim.rlim_cur = RLIM_INFINITY;
4697 rlim.rlim_max = RLIM_INFINITY;
4698 // Remove the maximum core size
4699 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4700 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4701
4702 // Make core dumps go to /tmp
4703 chdir("/tmp");
4704 }
4705
4706 if (config->scheduler_fifo)
4707 {
4708 int ret;
4709 struct sched_param params = {0};
4710 params.sched_priority = 1;
4711
4712 if (get_nprocs() < 2)
4713 {
4714 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4715 config->scheduler_fifo = 0;
4716 }
4717 else
4718 {
4719 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4720 {
4721 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4722 }
4723 else
4724 {
4725 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4726 config->scheduler_fifo = 0;
4727 }
4728 }
4729 }
4730
4731 initnetlink();
4732
4733 /* Set up the cluster communications port. */
4734 if (cluster_init() < 0)
4735 exit(1);
4736
4737 inittun();
4738 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4739
4740 initudp();
4741 initrad();
4742 initippool();
4743
4744 // seed prng
4745 {
4746 unsigned seed = time_now ^ getpid();
4747 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4748 srand(seed);
4749 }
4750
4751 signal(SIGHUP, sighup_handler);
4752 signal(SIGCHLD, sigchild_handler);
4753 signal(SIGTERM, shutdown_handler);
4754 signal(SIGINT, shutdown_handler);
4755 signal(SIGQUIT, shutdown_handler);
4756
4757 // Prevent us from getting paged out
4758 if (config->lock_pages)
4759 {
4760 if (!mlockall(MCL_CURRENT))
4761 LOG(1, 0, 0, "Locking pages into memory\n");
4762 else
4763 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4764 }
4765
4766 mainloop();
4767
4768 /* remove plugins (so cleanup code gets run) */
4769 plugins_done();
4770
4771 // Remove the PID file if we wrote it
4772 if (config->wrote_pid && *config->pid_file == '/')
4773 unlink(config->pid_file);
4774
4775 /* kill CLI children */
4776 signal(SIGTERM, SIG_IGN);
4777 kill(0, SIGTERM);
4778 return 0;
4779 }
4780
4781 static void sighup_handler(int sig)
4782 {
4783 main_reload++;
4784 }
4785
4786 static void shutdown_handler(int sig)
4787 {
4788 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4789 }
4790
4791 static void sigchild_handler(int sig)
4792 {
4793 while (waitpid(-1, NULL, WNOHANG) > 0)
4794 ;
4795 }
4796
4797 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4798 {
4799 MD5_CTX ctx;
4800 *challenge_response = NULL;
4801
4802 if (!*config->l2tp_secret)
4803 {
4804 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4805 return;
4806 }
4807
4808 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4809
4810 *challenge_response = calloc(17, 1);
4811
4812 MD5_Init(&ctx);
4813 MD5_Update(&ctx, &id, 1);
4814 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4815 MD5_Update(&ctx, challenge, challenge_length);
4816 MD5_Final(*challenge_response, &ctx);
4817
4818 return;
4819 }
4820
4821 static int facility_value(char *name)
4822 {
4823 int i;
4824 for (i = 0; facilitynames[i].c_name; i++)
4825 {
4826 if (strcmp(facilitynames[i].c_name, name) == 0)
4827 return facilitynames[i].c_val;
4828 }
4829 return 0;
4830 }
4831
4832 static void update_config()
4833 {
4834 int i;
4835 char *p;
4836 static int timeout = 0;
4837 static int interval = 0;
4838
4839 // Update logging
4840 closelog();
4841 syslog_log = 0;
4842 if (log_stream)
4843 {
4844 if (log_stream != stderr)
4845 fclose(log_stream);
4846
4847 log_stream = NULL;
4848 }
4849
4850 if (*config->log_filename)
4851 {
4852 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4853 {
4854 char *p = config->log_filename + 7;
4855 if (*p)
4856 {
4857 openlog("l2tpns", LOG_PID, facility_value(p));
4858 syslog_log = 1;
4859 }
4860 }
4861 else if (strchr(config->log_filename, '/') == config->log_filename)
4862 {
4863 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4864 {
4865 fseek(log_stream, 0, SEEK_END);
4866 setbuf(log_stream, NULL);
4867 }
4868 else
4869 {
4870 log_stream = stderr;
4871 setbuf(log_stream, NULL);
4872 }
4873 }
4874 }
4875 else
4876 {
4877 log_stream = stderr;
4878 setbuf(log_stream, NULL);
4879 }
4880
4881 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4882 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4883
4884 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4885 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4886 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4887
4888 // reset MRU/MSS globals
4889 MRU = config->l2tp_mtu - L2TP_HDRS;
4890 if (MRU > PPPoE_MRU)
4891 MRU = PPPoE_MRU;
4892
4893 MSS = MRU - TCP_HDRS;
4894
4895 // Update radius
4896 config->numradiusservers = 0;
4897 for (i = 0; i < MAXRADSERVER; i++)
4898 if (config->radiusserver[i])
4899 {
4900 config->numradiusservers++;
4901 // Set radius port: if not set, take the port from the
4902 // first radius server. For the first radius server,
4903 // take the #defined default value from l2tpns.h
4904
4905 // test twice, In case someone works with
4906 // a secondary radius server without defining
4907 // a primary one, this will work even then.
4908 if (i > 0 && !config->radiusport[i])
4909 config->radiusport[i] = config->radiusport[i-1];
4910 if (!config->radiusport[i])
4911 config->radiusport[i] = RADPORT;
4912 }
4913
4914 if (!config->numradiusservers)
4915 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4916
4917 // parse radius_authtypes_s
4918 config->radius_authtypes = config->radius_authprefer = 0;
4919 p = config->radius_authtypes_s;
4920 while (p && *p)
4921 {
4922 char *s = strpbrk(p, " \t,");
4923 int type = 0;
4924
4925 if (s)
4926 {
4927 *s++ = 0;
4928 while (*s == ' ' || *s == '\t')
4929 s++;
4930
4931 if (!*s)
4932 s = 0;
4933 }
4934
4935 if (!strncasecmp("chap", p, strlen(p)))
4936 type = AUTHCHAP;
4937 else if (!strncasecmp("pap", p, strlen(p)))
4938 type = AUTHPAP;
4939 else
4940 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4941
4942 config->radius_authtypes |= type;
4943 if (!config->radius_authprefer)
4944 config->radius_authprefer = type;
4945
4946 p = s;
4947 }
4948
4949 if (!config->radius_authtypes)
4950 {
4951 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4952 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4953 }
4954
4955 // normalise radius_authtypes_s
4956 if (config->radius_authprefer == AUTHPAP)
4957 {
4958 strcpy(config->radius_authtypes_s, "pap");
4959 if (config->radius_authtypes & AUTHCHAP)
4960 strcat(config->radius_authtypes_s, ", chap");
4961 }
4962 else
4963 {
4964 strcpy(config->radius_authtypes_s, "chap");
4965 if (config->radius_authtypes & AUTHPAP)
4966 strcat(config->radius_authtypes_s, ", pap");
4967 }
4968
4969 if (!config->radius_dae_port)
4970 config->radius_dae_port = DAEPORT;
4971
4972 // re-initialise the random number source
4973 initrandom(config->random_device);
4974
4975 // Update plugins
4976 for (i = 0; i < MAXPLUGINS; i++)
4977 {
4978 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4979 continue;
4980
4981 if (*config->plugins[i])
4982 {
4983 // Plugin added
4984 add_plugin(config->plugins[i]);
4985 }
4986 else if (*config->old_plugins[i])
4987 {
4988 // Plugin removed
4989 remove_plugin(config->old_plugins[i]);
4990 }
4991 }
4992
4993 // Guest change
4994 guest_accounts_num = 0;
4995 char *p2 = config->guest_user;
4996 while (p2 && *p2)
4997 {
4998 char *s = strpbrk(p2, " \t,");
4999 if (s)
5000 {
5001 *s++ = 0;
5002 while (*s == ' ' || *s == '\t')
5003 s++;
5004
5005 if (!*s)
5006 s = 0;
5007 }
5008
5009 strcpy(guest_users[guest_accounts_num], p2);
5010 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5011 guest_accounts_num++;
5012 p2 = s;
5013 }
5014 // Rebuild the guest_user array
5015 strcpy(config->guest_user, "");
5016 int ui = 0;
5017 for (ui=0; ui<guest_accounts_num; ui++)
5018 {
5019 strcat(config->guest_user, guest_users[ui]);
5020 if (ui<guest_accounts_num-1)
5021 {
5022 strcat(config->guest_user, ",");
5023 }
5024 }
5025
5026
5027 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5028 if (!config->multi_read_count) config->multi_read_count = 10;
5029 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5030 if (!*config->cluster_interface)
5031 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5032
5033 if (!config->cluster_hb_interval)
5034 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5035
5036 if (!config->cluster_hb_timeout)
5037 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5038
5039 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5040 {
5041 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5042 // late, ensure we're sufficiently larger than that
5043 int t = 4 * config->cluster_hb_interval + 11;
5044
5045 if (config->cluster_hb_timeout < t)
5046 {
5047 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5048 config->cluster_hb_timeout = t;
5049 }
5050
5051 // Push timing changes to the slaves immediately if we're the master
5052 if (config->cluster_iam_master)
5053 cluster_heartbeat();
5054
5055 interval = config->cluster_hb_interval;
5056 timeout = config->cluster_hb_timeout;
5057 }
5058
5059 // Write PID file
5060 if (*config->pid_file == '/' && !config->wrote_pid)
5061 {
5062 FILE *f;
5063 if ((f = fopen(config->pid_file, "w")))
5064 {
5065 fprintf(f, "%d\n", getpid());
5066 fclose(f);
5067 config->wrote_pid = 1;
5068 }
5069 else
5070 {
5071 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5072 }
5073 }
5074 }
5075
5076 static void read_config_file()
5077 {
5078 FILE *f;
5079
5080 if (!config->config_file) return;
5081 if (!(f = fopen(config->config_file, "r")))
5082 {
5083 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5084 return;
5085 }
5086
5087 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5088 cli_do_file(f);
5089 LOG(3, 0, 0, "Done reading config file\n");
5090 fclose(f);
5091 }
5092
5093 int sessionsetup(sessionidt s, tunnelidt t)
5094 {
5095 // A session now exists, set it up
5096 in_addr_t ip;
5097 char *user;
5098 sessionidt i;
5099 int r;
5100
5101 CSTAT(sessionsetup);
5102
5103 LOG(3, s, t, "Doing session setup for session\n");
5104
5105 // Join a bundle if the MRRU option is accepted
5106 if(session[s].mrru > 0 && session[s].bundle == 0)
5107 {
5108 LOG(3, s, t, "This session can be part of multilink bundle\n");
5109 if (join_bundle(s) > 0)
5110 cluster_send_bundle(session[s].bundle);
5111 else
5112 {
5113 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5114 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5115 return 0;
5116 }
5117 }
5118
5119 if (!session[s].ip)
5120 {
5121 assign_ip_address(s);
5122 if (!session[s].ip)
5123 {
5124 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5125 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5126 return 0;
5127 }
5128 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5129 fmtaddr(htonl(session[s].ip), 0));
5130 }
5131
5132
5133 // Make sure this is right
5134 session[s].tunnel = t;
5135
5136 // zap old sessions with same IP and/or username
5137 // Don't kill gardened sessions - doing so leads to a DoS
5138 // from someone who doesn't need to know the password
5139 {
5140 ip = session[s].ip;
5141 user = session[s].user;
5142 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5143 {
5144 if (i == s) continue;
5145 if (!session[s].opened) continue;
5146 // Allow duplicate sessions for multilink ones of the same bundle.
5147 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
5148 continue;
5149 if (ip == session[i].ip)
5150 {
5151 sessionkill(i, "Duplicate IP address");
5152 continue;
5153 }
5154
5155 if (config->allow_duplicate_users) continue;
5156 if (session[s].walled_garden || session[i].walled_garden) continue;
5157 // Guest change
5158 int found = 0;
5159 int gu;
5160 for (gu = 0; gu < guest_accounts_num; gu++)
5161 {
5162 if (!strcasecmp(user, guest_users[gu]))
5163 {
5164 found = 1;
5165 break;
5166 }
5167 }
5168 if (found) continue;
5169
5170 // Drop the new session in case of duplicate sessionss, not the old one.
5171 if (!strcasecmp(user, session[i].user))
5172 sessionkill(i, "Duplicate session for users");
5173 }
5174 }
5175
5176 // no need to set a route for the same IP address of the bundle
5177 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5178 {
5179 int routed = 0;
5180
5181 // Add the route for this session.
5182 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5183 {
5184 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5185 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5186 routed++;
5187
5188 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5189 }
5190
5191 // Static IPs need to be routed if not already
5192 // convered by a Framed-Route. Anything else is part
5193 // of the IP address pool and is already routed, it
5194 // just needs to be added to the IP cache.
5195 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5196 if (session[s].ip_pool_index == -1) // static ip
5197 {
5198 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5199 }
5200 else
5201 cache_ipmap(session[s].ip, s);
5202 }
5203
5204 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5205 lcp_open(s, t); // transition to Network phase and send initial IPCP
5206
5207 // Run the plugin's against this new session.
5208 {
5209 struct param_new_session data = { &tunnel[t], &session[s] };
5210 run_plugins(PLUGIN_NEW_SESSION, &data);
5211 }
5212
5213 // Allocate TBFs if throttled
5214 if (session[s].throttle_in || session[s].throttle_out)
5215 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5216
5217 session[s].last_packet = session[s].last_data = time_now;
5218
5219 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5220 fmtaddr(htonl(session[s].ip), 0),
5221 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5222
5223 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5224
5225 return 1; // RADIUS OK and IP allocated, done...
5226 }
5227
5228 //
5229 // This session just got dropped on us by the master or something.
5230 // Make sure our tables up up to date...
5231 //
5232 int load_session(sessionidt s, sessiont *new)
5233 {
5234 int i;
5235 int newip = 0;
5236
5237 // Sanity checks.
5238 if (new->ip_pool_index >= MAXIPPOOL ||
5239 new->tunnel >= MAXTUNNEL)
5240 {
5241 LOG(0, s, 0, "Strange session update received!\n");
5242 // FIXME! What to do here?
5243 return 0;
5244 }
5245
5246 //
5247 // Ok. All sanity checks passed. Now we're committed to
5248 // loading the new session.
5249 //
5250
5251 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5252
5253 // See if routes/ip cache need updating
5254 if (new->ip != session[s].ip)
5255 newip++;
5256
5257 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5258 if (new->route[i].ip != session[s].route[i].ip ||
5259 new->route[i].prefixlen != session[s].route[i].prefixlen)
5260 newip++;
5261
5262 // needs update
5263 if (newip)
5264 {
5265 int routed = 0;
5266
5267 // remove old routes...
5268 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5269 {
5270 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5271 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5272 routed++;
5273
5274 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5275 }
5276
5277 // ...ip
5278 if (session[s].ip)
5279 {
5280 if (session[s].ip_pool_index == -1) // static IP
5281 {
5282 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5283 }
5284 else // It's part of the IP pool, remove it manually.
5285 uncache_ipmap(session[s].ip);
5286 }
5287
5288 routed = 0;
5289
5290 // add new routes...
5291 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5292 {
5293 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5294 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5295 routed++;
5296
5297 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5298 }
5299
5300 // ...ip
5301 if (new->ip)
5302 {
5303 // If there's a new one, add it.
5304 if (new->ip_pool_index == -1)
5305 {
5306 if (!routed) routeset(s, new->ip, 0, 0, 1);
5307 }
5308 else
5309 cache_ipmap(new->ip, s);
5310 }
5311 }
5312
5313 // check v6 routing
5314 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5315 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5316
5317 // check filters
5318 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5319 {
5320 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5321 new->filter_in = 0;
5322 }
5323
5324 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5325 {
5326 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5327 new->filter_out = 0;
5328 }
5329
5330 if (new->filter_in != session[s].filter_in)
5331 {
5332 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5333 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5334 }
5335
5336 if (new->filter_out != session[s].filter_out)
5337 {
5338 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5339 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5340 }
5341
5342 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5343 // for walking the sessions to forward byte counts to the master.
5344 config->cluster_highest_sessionid = s;
5345
5346 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5347
5348 // Do fixups into address pool.
5349 if (new->ip_pool_index != -1)
5350 fix_address_pool(s);
5351
5352 return 1;
5353 }
5354
5355 static void initplugins()
5356 {
5357 int i;
5358
5359 loaded_plugins = ll_init();
5360 // Initialize the plugins to nothing
5361 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5362 plugins[i] = ll_init();
5363 }
5364
5365 static void *open_plugin(char *plugin_name, int load)
5366 {
5367 char path[256] = "";
5368
5369 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5370 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5371 return dlopen(path, RTLD_NOW);
5372 }
5373
5374 // plugin callback to get a config value
5375 static void *getconfig(char *key, enum config_typet type)
5376 {
5377 int i;
5378
5379 for (i = 0; config_values[i].key; i++)
5380 {
5381 if (!strcmp(config_values[i].key, key))
5382 {
5383 if (config_values[i].type == type)
5384 return ((void *) config) + config_values[i].offset;
5385
5386 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5387 key, type, config_values[i].type);
5388
5389 return 0;
5390 }
5391 }
5392
5393 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5394 return 0;
5395 }
5396
5397 static int add_plugin(char *plugin_name)
5398 {
5399 static struct pluginfuncs funcs = {
5400 _log,
5401 _log_hex,
5402 fmtaddr,
5403 sessionbyuser,
5404 sessiontbysessionidt,
5405 sessionidtbysessiont,
5406 radiusnew,
5407 radiussend,
5408 getconfig,
5409 sessionshutdown,
5410 sessionkill,
5411 throttle_session,
5412 cluster_send_session,
5413 };
5414
5415 void *p = open_plugin(plugin_name, 1);
5416 int (*initfunc)(struct pluginfuncs *);
5417 int i;
5418
5419 if (!p)
5420 {
5421 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5422 return -1;
5423 }
5424
5425 if (ll_contains(loaded_plugins, p))
5426 {
5427 dlclose(p);
5428 return 0; // already loaded
5429 }
5430
5431 {
5432 int *v = dlsym(p, "plugin_api_version");
5433 if (!v || *v != PLUGIN_API_VERSION)
5434 {
5435 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5436 dlclose(p);
5437 return -1;
5438 }
5439 }
5440
5441 if ((initfunc = dlsym(p, "plugin_init")))
5442 {
5443 if (!initfunc(&funcs))
5444 {
5445 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5446 dlclose(p);
5447 return -1;
5448 }
5449 }
5450
5451 ll_push(loaded_plugins, p);
5452
5453 for (i = 0; i < max_plugin_functions; i++)
5454 {
5455 void *x;
5456 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5457 {
5458 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5459 ll_push(plugins[i], x);
5460 }
5461 }
5462
5463 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5464 return 1;
5465 }
5466
5467 static void run_plugin_done(void *plugin)
5468 {
5469 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5470
5471 if (donefunc)
5472 donefunc();
5473 }
5474
5475 static int remove_plugin(char *plugin_name)
5476 {
5477 void *p = open_plugin(plugin_name, 0);
5478 int loaded = 0;
5479
5480 if (!p)
5481 return -1;
5482
5483 if (ll_contains(loaded_plugins, p))
5484 {
5485 int i;
5486 for (i = 0; i < max_plugin_functions; i++)
5487 {
5488 void *x;
5489 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5490 ll_delete(plugins[i], x);
5491 }
5492
5493 ll_delete(loaded_plugins, p);
5494 run_plugin_done(p);
5495 loaded = 1;
5496 }
5497
5498 dlclose(p);
5499 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5500 return loaded;
5501 }
5502
5503 int run_plugins(int plugin_type, void *data)
5504 {
5505 int (*func)(void *data);
5506
5507 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5508 return PLUGIN_RET_ERROR;
5509
5510 ll_reset(plugins[plugin_type]);
5511 while ((func = ll_next(plugins[plugin_type])))
5512 {
5513 int r = func(data);
5514
5515 if (r != PLUGIN_RET_OK)
5516 return r; // stop here
5517 }
5518
5519 return PLUGIN_RET_OK;
5520 }
5521
5522 static void plugins_done()
5523 {
5524 void *p;
5525
5526 ll_reset(loaded_plugins);
5527 while ((p = ll_next(loaded_plugins)))
5528 run_plugin_done(p);
5529 }
5530
5531 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5532 {
5533 struct nsctl request;
5534 struct nsctl response;
5535 int type = unpack_control(&request, buf, len);
5536 int r;
5537 void *p;
5538
5539 if (log_stream && config->debug >= 4)
5540 {
5541 if (type < 0)
5542 {
5543 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5544 fmtaddr(addr->sin_addr.s_addr, 0), type);
5545 }
5546 else
5547 {
5548 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5549 dump_control(&request, log_stream);
5550 }
5551 }
5552
5553 switch (type)
5554 {
5555 case NSCTL_REQ_LOAD:
5556 if (request.argc != 1)
5557 {
5558 response.type = NSCTL_RES_ERR;
5559 response.argc = 1;
5560 response.argv[0] = "name of plugin required";
5561 }
5562 else if ((r = add_plugin(request.argv[0])) < 1)
5563 {
5564 response.type = NSCTL_RES_ERR;
5565 response.argc = 1;
5566 response.argv[0] = !r
5567 ? "plugin already loaded"
5568 : "error loading plugin";
5569 }
5570 else
5571 {
5572 response.type = NSCTL_RES_OK;
5573 response.argc = 0;
5574 }
5575
5576 break;
5577
5578 case NSCTL_REQ_UNLOAD:
5579 if (request.argc != 1)
5580 {
5581 response.type = NSCTL_RES_ERR;
5582 response.argc = 1;
5583 response.argv[0] = "name of plugin required";
5584 }
5585 else if ((r = remove_plugin(request.argv[0])) < 1)
5586 {
5587 response.type = NSCTL_RES_ERR;
5588 response.argc = 1;
5589 response.argv[0] = !r
5590 ? "plugin not loaded"
5591 : "plugin not found";
5592 }
5593 else
5594 {
5595 response.type = NSCTL_RES_OK;
5596 response.argc = 0;
5597 }
5598
5599 break;
5600
5601 case NSCTL_REQ_HELP:
5602 response.type = NSCTL_RES_OK;
5603 response.argc = 0;
5604
5605 ll_reset(loaded_plugins);
5606 while ((p = ll_next(loaded_plugins)))
5607 {
5608 char **help = dlsym(p, "plugin_control_help");
5609 while (response.argc < 0xff && help && *help)
5610 response.argv[response.argc++] = *help++;
5611 }
5612
5613 break;
5614
5615 case NSCTL_REQ_CONTROL:
5616 {
5617 struct param_control param = {
5618 config->cluster_iam_master,
5619 request.argc,
5620 request.argv,
5621 0,
5622 NULL,
5623 };
5624
5625 int r = run_plugins(PLUGIN_CONTROL, &param);
5626
5627 if (r == PLUGIN_RET_ERROR)
5628 {
5629 response.type = NSCTL_RES_ERR;
5630 response.argc = 1;
5631 response.argv[0] = param.additional
5632 ? param.additional
5633 : "error returned by plugin";
5634 }
5635 else if (r == PLUGIN_RET_NOTMASTER)
5636 {
5637 static char msg[] = "must be run on master: 000.000.000.000";
5638
5639 response.type = NSCTL_RES_ERR;
5640 response.argc = 1;
5641 if (config->cluster_master_address)
5642 {
5643 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5644 response.argv[0] = msg;
5645 }
5646 else
5647 {
5648 response.argv[0] = "must be run on master: none elected";
5649 }
5650 }
5651 else if (!(param.response & NSCTL_RESPONSE))
5652 {
5653 response.type = NSCTL_RES_ERR;
5654 response.argc = 1;
5655 response.argv[0] = param.response
5656 ? "unrecognised response value from plugin"
5657 : "unhandled action";
5658 }
5659 else
5660 {
5661 response.type = param.response;
5662 response.argc = 0;
5663 if (param.additional)
5664 {
5665 response.argc = 1;
5666 response.argv[0] = param.additional;
5667 }
5668 }
5669 }
5670
5671 break;
5672
5673 default:
5674 response.type = NSCTL_RES_ERR;
5675 response.argc = 1;
5676 response.argv[0] = "error unpacking control packet";
5677 }
5678
5679 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5680 if (!buf)
5681 {
5682 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5683 return;
5684 }
5685
5686 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5687 if (r > 0)
5688 {
5689 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5690 if (log_stream && config->debug >= 4)
5691 {
5692 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5693 dump_control(&response, log_stream);
5694 }
5695 }
5696 else
5697 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5698 fmtaddr(addr->sin_addr.s_addr, 0), r);
5699
5700 free(buf);
5701 }
5702
5703 static tunnelidt new_tunnel()
5704 {
5705 tunnelidt i;
5706 for (i = 1; i < MAXTUNNEL; i++)
5707 {
5708 if (tunnel[i].state == TUNNELFREE)
5709 {
5710 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5711 if (i > config->cluster_highest_tunnelid)
5712 config->cluster_highest_tunnelid = i;
5713 return i;
5714 }
5715 }
5716 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5717 return 0;
5718 }
5719
5720 //
5721 // We're becoming the master. Do any required setup..
5722 //
5723 // This is principally telling all the plugins that we're
5724 // now a master, and telling them about all the sessions
5725 // that are active too..
5726 //
5727 void become_master(void)
5728 {
5729 int s, i;
5730 static struct event_data d[RADIUS_FDS];
5731 struct epoll_event e;
5732
5733 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5734
5735 // running a bunch of iptables commands is slow and can cause
5736 // the master to drop tunnels on takeover--kludge around the
5737 // problem by forking for the moment (note: race)
5738 if (!fork_and_close())
5739 {
5740 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5741 {
5742 if (!session[s].opened) // Not an in-use session.
5743 continue;
5744
5745 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5746 }
5747 exit(0);
5748 }
5749
5750 // add radius fds
5751 e.events = EPOLLIN;
5752 for (i = 0; i < RADIUS_FDS; i++)
5753 {
5754 d[i].type = FD_TYPE_RADIUS;
5755 d[i].index = i;
5756 e.data.ptr = &d[i];
5757
5758 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5759 }
5760 }
5761
5762 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5763 {
5764 int s, i;
5765 int count = 0;
5766 int buckets[64];
5767
5768 if (CLI_HELP_REQUESTED)
5769 return CLI_HELP_NO_ARGS;
5770
5771 time(&time_now);
5772 for (i = 0; i < 64;++i) buckets[i] = 0;
5773
5774 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5775 {
5776 int idle;
5777 if (!session[s].opened)
5778 continue;
5779
5780 idle = time_now - session[s].last_data;
5781 idle /= 5 ; // In multiples of 5 seconds.
5782 if (idle < 0)
5783 idle = 0;
5784 if (idle > 63)
5785 idle = 63;
5786
5787 ++count;
5788 ++buckets[idle];
5789 }
5790
5791 for (i = 0; i < 63; ++i)
5792 {
5793 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5794 }
5795 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5796 cli_print(cli, "%d total sessions open.", count);
5797 return CLI_OK;
5798 }
5799
5800 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5801 {
5802 int s, i;
5803 int count = 0;
5804 int buckets[64];
5805
5806 if (CLI_HELP_REQUESTED)
5807 return CLI_HELP_NO_ARGS;
5808
5809 time(&time_now);
5810 for (i = 0; i < 64;++i) buckets[i] = 0;
5811
5812 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5813 {
5814 int open = 0, d;
5815 if (!session[s].opened)
5816 continue;
5817
5818 d = time_now - session[s].opened;
5819 if (d < 0)
5820 d = 0;
5821 while (d > 1 && open < 32)
5822 {
5823 ++open;
5824 d >>= 1; // half.
5825 }
5826 ++count;
5827 ++buckets[open];
5828 }
5829
5830 s = 1;
5831 for (i = 0; i < 30; ++i)
5832 {
5833 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5834 s <<= 1;
5835 }
5836 cli_print(cli, "%d total sessions open.", count);
5837 return CLI_OK;
5838 }
5839
5840 /* Unhide an avp.
5841 *
5842 * This unencodes the AVP using the L2TP secret and the previously
5843 * stored random vector. It overwrites the hidden data with the
5844 * unhidden AVP subformat.
5845 */
5846 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5847 {
5848 MD5_CTX ctx;
5849 uint8_t digest[16];
5850 uint8_t *last;
5851 size_t d = 0;
5852 uint16_t m = htons(type);
5853
5854 // Compute initial pad
5855 MD5_Init(&ctx);
5856 MD5_Update(&ctx, (unsigned char *) &m, 2);
5857 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5858 MD5_Update(&ctx, vector, vec_len);
5859 MD5_Final(digest, &ctx);
5860
5861 // pointer to last decoded 16 octets
5862 last = value;
5863
5864 while (len > 0)
5865 {
5866 // calculate a new pad based on the last decoded block
5867 if (d >= sizeof(digest))
5868 {
5869 MD5_Init(&ctx);
5870 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5871 MD5_Update(&ctx, last, sizeof(digest));
5872 MD5_Final(digest, &ctx);
5873
5874 d = 0;
5875 last = value;
5876 }
5877
5878 *value++ ^= digest[d++];
5879 len--;
5880 }
5881 }
5882
5883 int find_filter(char const *name, size_t len)
5884 {
5885 int free = -1;
5886 int i;
5887
5888 for (i = 0; i < MAXFILTER; i++)
5889 {
5890 if (!*ip_filters[i].name)
5891 {
5892 if (free < 0)
5893 free = i;
5894
5895 continue;
5896 }
5897
5898 if (strlen(ip_filters[i].name) != len)
5899 continue;
5900
5901 if (!strncmp(ip_filters[i].name, name, len))
5902 return i;
5903 }
5904
5905 return free;
5906 }
5907
5908 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5909 {
5910 switch (p->op)
5911 {
5912 case FILTER_PORT_OP_EQ: return port == p->port;
5913 case FILTER_PORT_OP_NEQ: return port != p->port;
5914 case FILTER_PORT_OP_GT: return port > p->port;
5915 case FILTER_PORT_OP_LT: return port < p->port;
5916 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5917 }
5918
5919 return 0;
5920 }
5921
5922 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5923 {
5924 switch (op)
5925 {
5926 case FILTER_FLAG_OP_ANY:
5927 return (flags & sflags) || (~flags & cflags);
5928
5929 case FILTER_FLAG_OP_ALL:
5930 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5931
5932 case FILTER_FLAG_OP_EST:
5933 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5934 }
5935
5936 return 0;
5937 }
5938
5939 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5940 {
5941 uint16_t frag_offset;
5942 uint8_t proto;
5943 in_addr_t src_ip;
5944 in_addr_t dst_ip;
5945 uint16_t src_port = 0;
5946 uint16_t dst_port = 0;
5947 uint8_t flags = 0;
5948 ip_filter_rulet *rule;
5949
5950 if (len < 20) // up to end of destination address
5951 return 0;
5952
5953 if ((*buf >> 4) != 4) // IPv4
5954 return 0;
5955
5956 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5957 proto = buf[9];
5958 src_ip = *(in_addr_t *) (buf + 12);
5959 dst_ip = *(in_addr_t *) (buf + 16);
5960
5961 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5962 {
5963 int l = (buf[0] & 0xf) * 4; // length of IP header
5964 if (len < l + 4) // ports
5965 return 0;
5966
5967 src_port = ntohs(*(uint16_t *) (buf + l));
5968 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5969 if (proto == IPPROTO_TCP)
5970 {
5971 if (len < l + 14) // flags
5972 return 0;
5973
5974 flags = buf[l + 13] & 0x3f;
5975 }
5976 }
5977
5978 for (rule = ip_filters[filter].rules; rule->action; rule++)
5979 {
5980 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5981 continue;
5982
5983 if (rule->src_wild != INADDR_BROADCAST &&
5984 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5985 continue;
5986
5987 if (rule->dst_wild != INADDR_BROADCAST &&
5988 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
5989 continue;
5990
5991 if (frag_offset)
5992 {
5993 // layer 4 deny rules are skipped
5994 if (rule->action == FILTER_ACTION_DENY &&
5995 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
5996 continue;
5997 }
5998 else
5999 {
6000 if (rule->frag)
6001 continue;
6002
6003 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6004 {
6005 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6006 continue;
6007
6008 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6009 continue;
6010
6011 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6012 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6013 continue;
6014 }
6015 }
6016
6017 // matched
6018 rule->counter++;
6019 return rule->action == FILTER_ACTION_PERMIT;
6020 }
6021
6022 // default deny
6023 return 0;
6024 }