57e3215d53abae9e9cd8ac224a9847f129d91a50
[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' and 'mask' must be in _host_ order.
423 //
424 static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
425 {
426 struct rtentry r;
427 int i;
428
429 if (!mask) mask = 0xffffffff;
430
431 ip &= mask; // Force the ip to be the first one in the route.
432
433 memset(&r, 0, sizeof(r));
434 r.rt_dev = config->tundevice;
435 r.rt_dst.sa_family = AF_INET;
436 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
437 r.rt_gateway.sa_family = AF_INET;
438 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
439 r.rt_genmask.sa_family = AF_INET;
440 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
441 r.rt_flags = (RTF_UP | RTF_STATIC);
442 if (gw)
443 r.rt_flags |= RTF_GATEWAY;
444 else if (mask == 0xffffffff)
445 r.rt_flags |= RTF_HOST;
446
447 LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
448 fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
449 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
450
451 if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
452 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
453
454 #ifdef BGP
455 if (add)
456 bgp_add_route(htonl(ip), htonl(mask));
457 else
458 bgp_del_route(htonl(ip), htonl(mask));
459 #endif /* BGP */
460
461 // Add/Remove the IPs to the 'sessionbyip' cache.
462 // Note that we add the zero address in the case of
463 // a network route. Roll on CIDR.
464
465 // Note that 's == 0' implies this is the address pool.
466 // We still cache it here, because it will pre-fill
467 // the malloc'ed tree.
468
469 if (s)
470 {
471 if (!add) // Are we deleting a route?
472 s = 0; // Caching the session as '0' is the same as uncaching.
473
474 for (i = ip; (i&mask) == (ip&mask) ; ++i)
475 cache_ipmap(i, s);
476 }
477 }
478
479 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
480 {
481 struct in6_rtmsg rt;
482 char ipv6addr[INET6_ADDRSTRLEN];
483
484 if (ifr6fd < 0)
485 {
486 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
487 return;
488 }
489
490 memset(&rt, 0, sizeof(rt));
491
492 memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
493 rt.rtmsg_dst_len = prefixlen;
494 rt.rtmsg_metric = 1;
495 rt.rtmsg_flags = RTF_UP;
496 rt.rtmsg_ifindex = tunidx;
497
498 LOG(1, 0, 0, "Route %s %s/%d\n",
499 add ? "add" : "del",
500 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
501 prefixlen);
502
503 if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
504 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
505 strerror(errno));
506
507 // FIXME: need to add BGP routing (RFC2858)
508
509 if (s)
510 {
511 if (!add) // Are we deleting a route?
512 s = 0; // Caching the session as '0' is the same as uncaching.
513
514 cache_ipv6map(ip, prefixlen, s);
515 }
516
517 return;
518 }
519
520 //
521 // Set up netlink socket
522 static void initnetlink(void)
523 {
524 struct sockaddr_nl nladdr;
525
526 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
527 if (nlfd < 0)
528 {
529 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
530 exit(1);
531 }
532
533 memset(&nladdr, 0, sizeof(nladdr));
534 nladdr.nl_family = AF_NETLINK;
535 nladdr.nl_pid = getpid();
536
537 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
538 {
539 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
540 exit(1);
541 }
542 }
543
544 static ssize_t netlink_send(struct nlmsghdr *nh)
545 {
546 struct sockaddr_nl nladdr;
547 struct iovec iov;
548 struct msghdr msg;
549
550 nh->nlmsg_pid = getpid();
551 nh->nlmsg_seq = ++nlseqnum;
552
553 // set kernel address
554 memset(&nladdr, 0, sizeof(nladdr));
555 nladdr.nl_family = AF_NETLINK;
556
557 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
558 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
559
560 return sendmsg(nlfd, &msg, 0);
561 }
562
563 static ssize_t netlink_recv(void *buf, ssize_t len)
564 {
565 struct sockaddr_nl nladdr;
566 struct iovec iov;
567 struct msghdr msg;
568
569 // set kernel address
570 memset(&nladdr, 0, sizeof(nladdr));
571 nladdr.nl_family = AF_NETLINK;
572
573 iov = (struct iovec){ buf, len };
574 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
575
576 return recvmsg(nlfd, &msg, 0);
577 }
578
579 /* adapted from iproute2 */
580 void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
581 {
582 int len = RTA_LENGTH(alen);
583 struct rtattr *rta;
584
585 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
586 rta->rta_type = type;
587 rta->rta_len = len;
588 memcpy(RTA_DATA(rta), data, alen);
589 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
590 }
591
592 // messages corresponding to different phases seq number
593 static char *tun_nl_phase_msg[] = {
594 "initialized",
595 "getting tun interface index",
596 "setting tun interface parameters",
597 "setting tun IPv4 address",
598 "setting tun LL IPv6 address",
599 "setting tun global IPv6 address",
600 };
601
602 //
603 // Set up TUN interface
604 static void inittun(void)
605 {
606 struct ifinfomsg ifinfo;
607 struct ifreq ifr;
608
609 memset(&ifr, 0, sizeof(ifr));
610 ifr.ifr_flags = IFF_TUN;
611
612 tunfd = open(TUNDEVICE, O_RDWR);
613 if (tunfd < 0)
614 { // fatal
615 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
616 exit(1);
617 }
618 {
619 int flags = fcntl(tunfd, F_GETFL, 0);
620 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
621 }
622 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
623 {
624 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
625 exit(1);
626 }
627 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
628 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
629
630 {
631 // get the interface index
632 struct {
633 struct nlmsghdr nh;
634 struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
635 struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
636 char ifname[IFNAMSIZ];
637 } req;
638 char buf[4096];
639 ssize_t len;
640 struct nlmsghdr *resp_nh;
641
642 req.nh.nlmsg_type = RTM_GETLINK;
643 req.nh.nlmsg_flags = NLM_F_REQUEST;
644 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
645
646 req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
647
648 netlink_addattr(&req.nh, IFLA_IFNAME, config->tundevice, strlen(config->tundevice)+1);
649
650 if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
651 {
652 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
653 exit(1);
654 }
655
656 resp_nh = (struct nlmsghdr *)buf;
657 if (!NLMSG_OK (resp_nh, len))
658 {
659 LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len);
660 exit(1);
661 }
662
663 memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
664 // got index
665 tunidx = ifinfo.ifi_index;
666 }
667 {
668 struct {
669 // interface setting
670 struct nlmsghdr nh;
671 union {
672 struct ifinfomsg ifinfo;
673 struct ifaddrmsg ifaddr;
674 } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
675 char rtdata[32]; // 32 should be enough
676 } req;
677 uint32_t txqlen, mtu;
678 struct in_addr ip;
679
680 memset(&req, 0, sizeof(req));
681
682 req.nh.nlmsg_type = RTM_SETLINK;
683 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
684 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
685
686 req.ifmsg.ifinfo = ifinfo;
687 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
688 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
689
690 /* Bump up the qlen to deal with bursts from the network */
691 txqlen = 1000;
692 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
693 /* set MTU to modem MRU */
694 mtu = MRU;
695 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
696
697 if (netlink_send(&req.nh) < 0)
698 goto senderror;
699
700 memset(&req, 0, sizeof(req));
701
702 req.nh.nlmsg_type = RTM_NEWADDR;
703 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
704 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
705
706 req.ifmsg.ifaddr.ifa_family = AF_INET;
707 req.ifmsg.ifaddr.ifa_prefixlen = 32;
708 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
709
710 if (config->bind_address)
711 ip.s_addr = config->bind_address;
712 else
713 ip.s_addr = 0x01010101, // 1.1.1.1
714 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
715
716 if (netlink_send(&req.nh) < 0)
717 goto senderror;
718
719 // Only setup IPv6 on the tun device if we have a configured prefix
720 if (config->ipv6_prefix.s6_addr[0]) {
721 struct in6_addr ip6;
722
723 memset(&req, 0, sizeof(req));
724
725 req.nh.nlmsg_type = RTM_NEWADDR;
726 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
727 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
728
729 req.ifmsg.ifaddr.ifa_family = AF_INET6;
730 req.ifmsg.ifaddr.ifa_prefixlen = 64;
731 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
732 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
733
734 // Link local address is FE80::1
735 memset(&ip6, 0, sizeof(ip6));
736 ip6.s6_addr[0] = 0xFE;
737 ip6.s6_addr[1] = 0x80;
738 ip6.s6_addr[15] = 1;
739 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
740
741 if (netlink_send(&req.nh) < 0)
742 goto senderror;
743
744 memset(&req, 0, sizeof(req));
745
746 req.nh.nlmsg_type = RTM_NEWADDR;
747 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
748 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
749
750 req.ifmsg.ifaddr.ifa_family = AF_INET6;
751 req.ifmsg.ifaddr.ifa_prefixlen = 64;
752 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
753 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
754
755 // Global address is prefix::1
756 ip6 = config->ipv6_prefix;
757 ip6.s6_addr[15] = 1;
758 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
759
760 if (netlink_send(&req.nh) < 0)
761 goto senderror;
762 }
763
764 memset(&req, 0, sizeof(req));
765
766 req.nh.nlmsg_type = NLMSG_DONE;
767 req.nh.nlmsg_len = NLMSG_LENGTH(0);
768
769 if (netlink_send(&req.nh) < 0)
770 goto senderror;
771
772 // if we get an error for seqnum < min_initok_nlseqnum,
773 // we must exit as initialization went wrong
774 if (config->ipv6_prefix.s6_addr[0])
775 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
776 else
777 min_initok_nlseqnum = 3 + 1; // idx + if + addr
778 }
779
780 return;
781
782 senderror:
783 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
784 exit(1);
785 }
786
787 // set up UDP ports
788 static void initudp(void)
789 {
790 int on = 1;
791 struct sockaddr_in addr;
792
793 // Tunnel
794 memset(&addr, 0, sizeof(addr));
795 addr.sin_family = AF_INET;
796 addr.sin_port = htons(L2TPPORT);
797 addr.sin_addr.s_addr = config->bind_address;
798 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
799 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
800 {
801 int flags = fcntl(udpfd, F_GETFL, 0);
802 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
803 }
804 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
805 {
806 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
807 exit(1);
808 }
809
810 // Control
811 memset(&addr, 0, sizeof(addr));
812 addr.sin_family = AF_INET;
813 addr.sin_port = htons(NSCTL_PORT);
814 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
815 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
816 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
817 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
818 {
819 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
820 exit(1);
821 }
822
823 // Dynamic Authorization Extensions to RADIUS
824 memset(&addr, 0, sizeof(addr));
825 addr.sin_family = AF_INET;
826 addr.sin_port = htons(config->radius_dae_port);
827 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
828 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
829 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
830 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
831 {
832 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
833 exit(1);
834 }
835
836 // Intercept
837 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
838 }
839
840 //
841 // Find session by IP, < 1 for not found
842 //
843 // Confusingly enough, this 'ip' must be
844 // in _network_ order. This being the common
845 // case when looking it up from IP packet headers.
846 //
847 // We actually use this cache for two things.
848 // #1. For used IP addresses, this maps to the
849 // session ID that it's used by.
850 // #2. For un-used IP addresses, this maps to the
851 // index into the pool table that contains that
852 // IP address.
853 //
854
855 static sessionidt lookup_ipmap(in_addr_t ip)
856 {
857 uint8_t *a = (uint8_t *) &ip;
858 union iphash *h = ip_hash;
859
860 if (!(h = h[*a++].idx)) return 0;
861 if (!(h = h[*a++].idx)) return 0;
862 if (!(h = h[*a++].idx)) return 0;
863
864 return h[*a].sess;
865 }
866
867 static sessionidt lookup_ipv6map(struct in6_addr ip)
868 {
869 struct ipv6radix *curnode;
870 int i;
871 int s;
872 char ipv6addr[INET6_ADDRSTRLEN];
873
874 curnode = &ipv6_hash[ip.s6_addr[0]];
875 i = 1;
876 s = curnode->sess;
877
878 while (s == 0 && i < 15 && curnode->branch != NULL)
879 {
880 curnode = &curnode->branch[ip.s6_addr[i]];
881 s = curnode->sess;
882 i++;
883 }
884
885 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
886 inet_ntop(AF_INET6, &ip, ipv6addr,
887 INET6_ADDRSTRLEN),
888 s);
889
890 return s;
891 }
892
893 sessionidt sessionbyip(in_addr_t ip)
894 {
895 sessionidt s = lookup_ipmap(ip);
896 CSTAT(sessionbyip);
897
898 if (s > 0 && s < MAXSESSION && session[s].opened)
899 return s;
900
901 return 0;
902 }
903
904 sessionidt sessionbyipv6(struct in6_addr ip)
905 {
906 sessionidt s;
907 CSTAT(sessionbyipv6);
908
909 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
910 (ip.s6_addr[0] == 0xFE &&
911 ip.s6_addr[1] == 0x80 &&
912 ip.s6_addr16[1] == 0 &&
913 ip.s6_addr16[2] == 0 &&
914 ip.s6_addr16[3] == 0)) {
915 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
916 } else {
917 s = lookup_ipv6map(ip);
918 }
919
920 if (s > 0 && s < MAXSESSION && session[s].opened)
921 return s;
922
923 return 0;
924 }
925
926 //
927 // Take an IP address in HOST byte order and
928 // add it to the sessionid by IP cache.
929 //
930 // (It's actually cached in network order)
931 //
932 static void cache_ipmap(in_addr_t ip, sessionidt s)
933 {
934 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
935 uint8_t *a = (uint8_t *) &nip;
936 union iphash *h = ip_hash;
937 int i;
938
939 for (i = 0; i < 3; i++)
940 {
941 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
942 return;
943
944 h = h[a[i]].idx;
945 }
946
947 h[a[3]].sess = s;
948
949 if (s > 0)
950 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
951
952 else if (s == 0)
953 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
954 // else a map to an ip pool index.
955 }
956
957 static void uncache_ipmap(in_addr_t ip)
958 {
959 cache_ipmap(ip, 0); // Assign it to the NULL session.
960 }
961
962 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
963 {
964 int i;
965 int bytes;
966 struct ipv6radix *curnode;
967 char ipv6addr[INET6_ADDRSTRLEN];
968
969 curnode = &ipv6_hash[ip.s6_addr[0]];
970
971 bytes = prefixlen >> 3;
972 i = 1;
973 while (i < bytes) {
974 if (curnode->branch == NULL)
975 {
976 if (!(curnode->branch = calloc(256,
977 sizeof (struct ipv6radix))))
978 return;
979 }
980 curnode = &curnode->branch[ip.s6_addr[i]];
981 i++;
982 }
983
984 curnode->sess = s;
985
986 if (s > 0)
987 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
988 inet_ntop(AF_INET6, &ip, ipv6addr,
989 INET6_ADDRSTRLEN),
990 prefixlen);
991 else if (s == 0)
992 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
993 inet_ntop(AF_INET6, &ip, ipv6addr,
994 INET6_ADDRSTRLEN),
995 prefixlen);
996 }
997
998 //
999 // CLI list to dump current ipcache.
1000 //
1001 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1002 {
1003 union iphash *d = ip_hash, *e, *f, *g;
1004 int i, j, k, l;
1005 int count = 0;
1006
1007 if (CLI_HELP_REQUESTED)
1008 return CLI_HELP_NO_ARGS;
1009
1010 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1011
1012 for (i = 0; i < 256; ++i)
1013 {
1014 if (!d[i].idx)
1015 continue;
1016
1017 e = d[i].idx;
1018 for (j = 0; j < 256; ++j)
1019 {
1020 if (!e[j].idx)
1021 continue;
1022
1023 f = e[j].idx;
1024 for (k = 0; k < 256; ++k)
1025 {
1026 if (!f[k].idx)
1027 continue;
1028
1029 g = f[k].idx;
1030 for (l = 0; l < 256; ++l)
1031 {
1032 if (!g[l].sess)
1033 continue;
1034
1035 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1036 ++count;
1037 }
1038 }
1039 }
1040 }
1041 cli_print(cli, "%d entries in cache", count);
1042 return CLI_OK;
1043 }
1044
1045
1046 // Find session by username, 0 for not found
1047 // walled garden users aren't authenticated, so the username is
1048 // reasonably useless. Ignore them to avoid incorrect actions
1049 //
1050 // This is VERY inefficent. Don't call it often. :)
1051 //
1052 sessionidt sessionbyuser(char *username)
1053 {
1054 int s;
1055 CSTAT(sessionbyuser);
1056
1057 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1058 {
1059 if (!session[s].opened)
1060 continue;
1061
1062 if (session[s].walled_garden)
1063 continue; // Skip walled garden users.
1064
1065 if (!strncmp(session[s].user, username, 128))
1066 return s;
1067
1068 }
1069 return 0; // Not found.
1070 }
1071
1072 void send_garp(in_addr_t ip)
1073 {
1074 int s;
1075 struct ifreq ifr;
1076 uint8_t mac[6];
1077
1078 s = socket(PF_INET, SOCK_DGRAM, 0);
1079 if (s < 0)
1080 {
1081 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1082 return;
1083 }
1084 memset(&ifr, 0, sizeof(ifr));
1085 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1086 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1087 {
1088 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1089 close(s);
1090 return;
1091 }
1092 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1093 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1094 {
1095 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1096 close(s);
1097 return;
1098 }
1099 close(s);
1100 sendarp(ifr.ifr_ifindex, mac, ip);
1101 }
1102
1103 static sessiont *sessiontbysessionidt(sessionidt s)
1104 {
1105 if (!s || s >= MAXSESSION) return NULL;
1106 return &session[s];
1107 }
1108
1109 static sessionidt sessionidtbysessiont(sessiont *s)
1110 {
1111 sessionidt val = s-session;
1112 if (s < session || val >= MAXSESSION) return 0;
1113 return val;
1114 }
1115
1116 // actually send a control message for a specific tunnel
1117 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1118 {
1119 struct sockaddr_in addr;
1120
1121 CSTAT(tunnelsend);
1122
1123 if (!t)
1124 {
1125 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1126 STAT(tunnel_tx_errors);
1127 return;
1128 }
1129
1130 if (!tunnel[t].ip)
1131 {
1132 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1133 STAT(tunnel_tx_errors);
1134 return;
1135 }
1136
1137 memset(&addr, 0, sizeof(addr));
1138 addr.sin_family = AF_INET;
1139 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1140 addr.sin_port = htons(tunnel[t].port);
1141
1142 // sequence expected, if sequence in message
1143 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1144
1145 // If this is a control message, deal with retries
1146 if (*buf & 0x80)
1147 {
1148 tunnel[t].last = time_now; // control message sent
1149 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1150 if (tunnel[t].try)
1151 {
1152 STAT(tunnel_retries);
1153 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1154 }
1155 }
1156
1157 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1158 {
1159 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1160 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1161 STAT(tunnel_tx_errors);
1162 return;
1163 }
1164
1165 LOG_HEX(5, "Send Tunnel Data", buf, l);
1166 STAT(tunnel_tx_packets);
1167 INC_STAT(tunnel_tx_bytes, l);
1168 }
1169
1170 //
1171 // Tiny helper function to write data to
1172 // the 'tun' device.
1173 //
1174 int tun_write(uint8_t * data, int size)
1175 {
1176 return write(tunfd, data, size);
1177 }
1178
1179 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1180 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1181 {
1182 int d = (tcp[12] >> 4) * 4;
1183 uint8_t *mss = 0;
1184 uint8_t *opts;
1185 uint8_t *data;
1186 uint16_t orig;
1187 uint32_t sum;
1188
1189 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1190 return;
1191
1192 if (tcp + d > buf + len) // short?
1193 return;
1194
1195 opts = tcp + 20;
1196 data = tcp + d;
1197
1198 while (opts < data)
1199 {
1200 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1201 {
1202 mss = opts + 2;
1203 if (mss + 2 > data) return; // short?
1204 break;
1205 }
1206
1207 if (*opts == 0) return; // end of options
1208 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1209 opts++;
1210 else
1211 opts += opts[1]; // skip over option
1212 }
1213
1214 if (!mss) return; // not found
1215 orig = ntohs(*(uint16_t *) mss);
1216
1217 if (orig <= MSS) return; // mss OK
1218
1219 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1220 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1221 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1222 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1223
1224 // set mss
1225 *(int16_t *) mss = htons(MSS);
1226
1227 // adjust checksum (see rfc1141)
1228 sum = orig + (~MSS & 0xffff);
1229 sum += ntohs(*(uint16_t *) (tcp + 16));
1230 sum = (sum & 0xffff) + (sum >> 16);
1231 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1232 }
1233
1234 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1235 {
1236 uint16_t proto;
1237 if (extra) {
1238 // Skip the four extra bytes
1239 p += 4;
1240 l -= 4;
1241 }
1242
1243 if (*p & 1)
1244 {
1245 proto = *p++;
1246 l--;
1247 }
1248 else
1249 {
1250 proto = ntohs(*(uint16_t *) p);
1251 p += 2;
1252 l -= 2;
1253 }
1254 if (proto == PPPIP)
1255 {
1256 if (session[s].die)
1257 {
1258 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1259 return; // closing session, PPP not processed
1260 }
1261 session[s].last_packet = session[s].last_data = time_now;
1262 processipin(s, t, p, l);
1263 }
1264 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1265 {
1266 if (session[s].die)
1267 {
1268 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1269 return; // closing session, PPP not processed
1270 }
1271
1272 session[s].last_packet = session[s].last_data = time_now;
1273 processipv6in(s, t, p, l);
1274 }
1275 else if (proto == PPPIPCP)
1276 {
1277 session[s].last_packet = session[s].last_data = time_now;
1278 processipcp(s, t, p, l);
1279 }
1280 else if (proto == PPPCCP)
1281 {
1282 session[s].last_packet = session[s].last_data = time_now;
1283 processccp(s, t, p, l);
1284 }
1285 else
1286 {
1287 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1288 }
1289 }
1290
1291 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1292 {
1293 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1294 sp->cout_delta += len;
1295 sp->pout++;
1296 sp->last_data = time_now;
1297
1298 sess_local[s].cout += len; // To send to master..
1299 sess_local[s].pout++;
1300 }
1301
1302 // process outgoing (to tunnel) IP
1303 //
1304 static void processipout(uint8_t *buf, int len)
1305 {
1306 sessionidt s;
1307 sessiont *sp;
1308 tunnelidt t;
1309 in_addr_t ip;
1310
1311 uint8_t *data = buf; // Keep a copy of the originals.
1312 int size = len;
1313
1314 uint8_t fragbuf[MAXETHER + 20];
1315
1316 CSTAT(processipout);
1317
1318 if (len < MIN_IP_SIZE)
1319 {
1320 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1321 STAT(tun_rx_errors);
1322 return;
1323 }
1324 if (len >= MAXETHER)
1325 {
1326 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1327 STAT(tun_rx_errors);
1328 return;
1329 }
1330
1331 // Skip the tun header
1332 buf += 4;
1333 len -= 4;
1334
1335 // Got an IP header now
1336 if (*(uint8_t *)(buf) >> 4 != 4)
1337 {
1338 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1339 return;
1340 }
1341
1342 ip = *(uint32_t *)(buf + 16);
1343 if (!(s = sessionbyip(ip)))
1344 {
1345 // Is this a packet for a session that doesn't exist?
1346 static int rate = 0; // Number of ICMP packets we've sent this second.
1347 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1348
1349 if (last != time_now)
1350 {
1351 last = time_now;
1352 rate = 0;
1353 }
1354
1355 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1356 {
1357 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1358 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1359 config->bind_address ? config->bind_address : my_address, buf, len);
1360 }
1361 return;
1362 }
1363
1364 t = session[s].tunnel;
1365 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1366 {
1367 LOG(3, s, t, "Packet size more than session MRU\n");
1368 return;
1369 }
1370
1371 sp = &session[s];
1372
1373 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1374 if (config->max_packets > 0)
1375 {
1376 if (sess_local[s].last_packet_out == TIME)
1377 {
1378 int max = config->max_packets;
1379
1380 // All packets for throttled sessions are handled by the
1381 // master, so further limit by using the throttle rate.
1382 // A bit of a kludge, since throttle rate is in kbps,
1383 // but should still be generous given our average DSL
1384 // packet size is 200 bytes: a limit of 28kbps equates
1385 // to around 180 packets per second.
1386 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1387 max = sp->throttle_out;
1388
1389 if (++sess_local[s].packets_out > max)
1390 {
1391 sess_local[s].packets_dropped++;
1392 return;
1393 }
1394 }
1395 else
1396 {
1397 if (sess_local[s].packets_dropped)
1398 {
1399 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1400 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1401 sess_local[s].packets_dropped, sess_local[s].packets_out,
1402 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1403 sp->user);
1404 }
1405
1406 sess_local[s].last_packet_out = TIME;
1407 sess_local[s].packets_out = 1;
1408 sess_local[s].packets_dropped = 0;
1409 }
1410 }
1411
1412 // run access-list if any
1413 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1414 return;
1415
1416 // adjust MSS on SYN and SYN,ACK packets with options
1417 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1418 {
1419 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1420 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1421 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1422 }
1423
1424 if (sp->tbf_out)
1425 {
1426 // Are we throttling this session?
1427 if (config->cluster_iam_master)
1428 tbf_queue_packet(sp->tbf_out, data, size);
1429 else
1430 master_throttle_packet(sp->tbf_out, data, size);
1431 return;
1432 }
1433
1434 if (sp->walled_garden && !config->cluster_iam_master)
1435 {
1436 // We are walled-gardening this
1437 master_garden_packet(s, data, size);
1438 return;
1439 }
1440
1441 // Add on L2TP header
1442 {
1443 bundleidt bid = 0;
1444 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1445 {
1446 bid = session[s].bundle;
1447 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1448 t = session[s].tunnel;
1449 sp = &session[s];
1450 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1451 if(len > MINFRAGLEN)
1452 {
1453 // Partition the packet to "bundle[b].num_of_links" fragments
1454 bundlet *b = &bundle[bid];
1455 uint32_t num_of_links = b->num_of_links;
1456 uint32_t fraglen = len / num_of_links;
1457 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1458 uint32_t last_fraglen = fraglen + len % num_of_links;
1459 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1460 uint32_t remain = len;
1461
1462 // send the first packet
1463 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1464 if (!p) return;
1465 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1466 // statistics
1467 update_session_out_stat(s, sp, fraglen);
1468 remain -= fraglen;
1469 while (remain > last_fraglen)
1470 {
1471 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1472 t = session[s].tunnel;
1473 sp = &session[s];
1474 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1475 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1476 if (!p) return;
1477 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1478 update_session_out_stat(s, sp, fraglen);
1479 remain -= fraglen;
1480 }
1481 // send the last fragment
1482 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1483 t = session[s].tunnel;
1484 sp = &session[s];
1485 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1486 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1487 if (!p) return;
1488 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1489 update_session_out_stat(s, sp, remain);
1490 if (remain != last_fraglen)
1491 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1492 }
1493 else {
1494 // Send it as one frame
1495 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1496 if (!p) return;
1497 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1498 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1499 update_session_out_stat(s, sp, len);
1500 }
1501 }
1502 else
1503 {
1504 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1505 if (!p) return;
1506 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1507 update_session_out_stat(s, sp, len);
1508 }
1509 }
1510
1511 // Snooping this session, send it to intercept box
1512 if (sp->snoop_ip && sp->snoop_port)
1513 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1514
1515 udp_tx += len;
1516 }
1517
1518 // process outgoing (to tunnel) IPv6
1519 //
1520 static void processipv6out(uint8_t * buf, int len)
1521 {
1522 sessionidt s;
1523 sessiont *sp;
1524 tunnelidt t;
1525 in_addr_t ip;
1526 struct in6_addr ip6;
1527
1528 uint8_t *data = buf; // Keep a copy of the originals.
1529 int size = len;
1530
1531 uint8_t b[MAXETHER + 20];
1532
1533 CSTAT(processipv6out);
1534
1535 if (len < MIN_IP_SIZE)
1536 {
1537 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1538 STAT(tunnel_tx_errors);
1539 return;
1540 }
1541 if (len >= MAXETHER)
1542 {
1543 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1544 STAT(tunnel_tx_errors);
1545 return;
1546 }
1547
1548 // Skip the tun header
1549 buf += 4;
1550 len -= 4;
1551
1552 // Got an IP header now
1553 if (*(uint8_t *)(buf) >> 4 != 6)
1554 {
1555 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1556 return;
1557 }
1558
1559 ip6 = *(struct in6_addr *)(buf+24);
1560 s = sessionbyipv6(ip6);
1561
1562 if (s == 0)
1563 {
1564 ip = *(uint32_t *)(buf + 32);
1565 s = sessionbyip(ip);
1566 }
1567
1568 if (s == 0)
1569 {
1570 // Is this a packet for a session that doesn't exist?
1571 static int rate = 0; // Number of ICMP packets we've sent this second.
1572 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1573
1574 if (last != time_now)
1575 {
1576 last = time_now;
1577 rate = 0;
1578 }
1579
1580 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1581 {
1582 // FIXME: Should send icmp6 host unreachable
1583 }
1584 return;
1585 }
1586 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1587 {
1588 bundleidt bid = session[s].bundle;
1589 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1590 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1591 }
1592 t = session[s].tunnel;
1593 sp = &session[s];
1594 sp->last_data = time_now;
1595
1596 // FIXME: add DoS prevention/filters?
1597
1598 if (sp->tbf_out)
1599 {
1600 // Are we throttling this session?
1601 if (config->cluster_iam_master)
1602 tbf_queue_packet(sp->tbf_out, data, size);
1603 else
1604 master_throttle_packet(sp->tbf_out, data, size);
1605 return;
1606 }
1607 else if (sp->walled_garden && !config->cluster_iam_master)
1608 {
1609 // We are walled-gardening this
1610 master_garden_packet(s, data, size);
1611 return;
1612 }
1613
1614 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1615
1616 // Add on L2TP header
1617 {
1618 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1619 if (!p) return;
1620 tunnelsend(b, len + (p-b), t); // send it...
1621 }
1622
1623 // Snooping this session, send it to intercept box
1624 if (sp->snoop_ip && sp->snoop_port)
1625 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1626
1627 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1628 sp->cout_delta += len;
1629 sp->pout++;
1630 udp_tx += len;
1631
1632 sess_local[s].cout += len; // To send to master..
1633 sess_local[s].pout++;
1634 }
1635
1636 //
1637 // Helper routine for the TBF filters.
1638 // Used to send queued data in to the user!
1639 //
1640 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1641 {
1642 sessiont *sp;
1643 tunnelidt t;
1644 in_addr_t ip;
1645
1646 uint8_t b[MAXETHER + 20];
1647
1648 if (len < 0 || len > MAXETHER)
1649 {
1650 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1651 return;
1652 }
1653
1654 // Skip the tun header
1655 buf += 4;
1656 len -= 4;
1657
1658 ip = *(in_addr_t *)(buf + 16);
1659
1660 if (!session[s].ip)
1661 return;
1662
1663 t = session[s].tunnel;
1664 sp = &session[s];
1665
1666 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1667
1668 // Add on L2TP header
1669 {
1670 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1671 if (!p) return;
1672 tunnelsend(b, len + (p-b), t); // send it...
1673 }
1674
1675 // Snooping this session.
1676 if (sp->snoop_ip && sp->snoop_port)
1677 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1678
1679 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1680 sp->cout_delta += len;
1681 sp->pout++;
1682 udp_tx += len;
1683
1684 sess_local[s].cout += len; // To send to master..
1685 sess_local[s].pout++;
1686 }
1687
1688 // add an AVP (16 bit)
1689 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1690 {
1691 uint16_t l = (m ? 0x8008 : 0x0008);
1692 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1693 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1694 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1695 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1696 c->length += 8;
1697 }
1698
1699 // add an AVP (32 bit)
1700 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1701 {
1702 uint16_t l = (m ? 0x800A : 0x000A);
1703 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1704 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1705 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1706 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1707 c->length += 10;
1708 }
1709
1710 // add an AVP (string)
1711 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1712 {
1713 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1714 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1715 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1716 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1717 memcpy(c->buf + c->length + 6, val, strlen(val));
1718 c->length += 6 + strlen(val);
1719 }
1720
1721 // add a binary AVP
1722 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1723 {
1724 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1725 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1726 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1727 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1728 memcpy(c->buf + c->length + 6, val, len);
1729 c->length += 6 + len;
1730 }
1731
1732 // new control connection
1733 static controlt *controlnew(uint16_t mtype)
1734 {
1735 controlt *c;
1736 if (!controlfree)
1737 c = malloc(sizeof(controlt));
1738 else
1739 {
1740 c = controlfree;
1741 controlfree = c->next;
1742 }
1743 assert(c);
1744 c->next = 0;
1745 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1746 c->length = 12;
1747 control16(c, 0, mtype, 1);
1748 return c;
1749 }
1750
1751 // send zero block if nothing is waiting
1752 // (ZLB send).
1753 static void controlnull(tunnelidt t)
1754 {
1755 uint8_t buf[12];
1756 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1757 return;
1758
1759 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1760 *(uint16_t *) (buf + 2) = htons(12); // length
1761 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1762 *(uint16_t *) (buf + 6) = htons(0); // session
1763 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1764 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1765 tunnelsend(buf, 12, t);
1766 }
1767
1768 // add a control message to a tunnel, and send if within window
1769 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1770 {
1771 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1772 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1773 *(uint16_t *) (c->buf + 6) = htons(far); // session
1774 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1775 tunnel[t].ns++; // advance sequence
1776 // link in message in to queue
1777 if (tunnel[t].controlc)
1778 tunnel[t].controle->next = c;
1779 else
1780 tunnel[t].controls = c;
1781
1782 tunnel[t].controle = c;
1783 tunnel[t].controlc++;
1784
1785 // send now if space in window
1786 if (tunnel[t].controlc <= tunnel[t].window)
1787 {
1788 tunnel[t].try = 0; // first send
1789 tunnelsend(c->buf, c->length, t);
1790 }
1791 }
1792
1793 //
1794 // Throttle or Unthrottle a session
1795 //
1796 // Throttle the data from/to through a session to no more than
1797 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1798 // user).
1799 //
1800 // If either value is -1, the current value is retained for that
1801 // direction.
1802 //
1803 void throttle_session(sessionidt s, int rate_in, int rate_out)
1804 {
1805 if (!session[s].opened)
1806 return; // No-one home.
1807
1808 if (!*session[s].user)
1809 return; // User not logged in
1810
1811 if (rate_in >= 0)
1812 {
1813 int bytes = rate_in * 1024 / 8; // kbits to bytes
1814 if (session[s].tbf_in)
1815 free_tbf(session[s].tbf_in);
1816
1817 if (rate_in > 0)
1818 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1819 else
1820 session[s].tbf_in = 0;
1821
1822 session[s].throttle_in = rate_in;
1823 }
1824
1825 if (rate_out >= 0)
1826 {
1827 int bytes = rate_out * 1024 / 8;
1828 if (session[s].tbf_out)
1829 free_tbf(session[s].tbf_out);
1830
1831 if (rate_out > 0)
1832 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1833 else
1834 session[s].tbf_out = 0;
1835
1836 session[s].throttle_out = rate_out;
1837 }
1838 }
1839
1840 // add/remove filters from session (-1 = no change)
1841 void filter_session(sessionidt s, int filter_in, int filter_out)
1842 {
1843 if (!session[s].opened)
1844 return; // No-one home.
1845
1846 if (!*session[s].user)
1847 return; // User not logged in
1848
1849 // paranoia
1850 if (filter_in > MAXFILTER) filter_in = -1;
1851 if (filter_out > MAXFILTER) filter_out = -1;
1852 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1853 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1854
1855 if (filter_in >= 0)
1856 {
1857 if (session[s].filter_in)
1858 ip_filters[session[s].filter_in - 1].used--;
1859
1860 if (filter_in > 0)
1861 ip_filters[filter_in - 1].used++;
1862
1863 session[s].filter_in = filter_in;
1864 }
1865
1866 if (filter_out >= 0)
1867 {
1868 if (session[s].filter_out)
1869 ip_filters[session[s].filter_out - 1].used--;
1870
1871 if (filter_out > 0)
1872 ip_filters[filter_out - 1].used++;
1873
1874 session[s].filter_out = filter_out;
1875 }
1876 }
1877
1878 // start tidy shutdown of session
1879 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1880 {
1881 int walled_garden = session[s].walled_garden;
1882 bundleidt b = session[s].bundle;
1883 //delete routes only for last session in bundle (in case of MPPP)
1884 int del_routes = !b || (bundle[b].num_of_links == 1);
1885
1886 CSTAT(sessionshutdown);
1887
1888 if (!session[s].opened)
1889 {
1890 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1891 return; // not a live session
1892 }
1893
1894 if (!session[s].die)
1895 {
1896 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1897 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1898 run_plugins(PLUGIN_KILL_SESSION, &data);
1899 session[s].die = TIME + 150; // Clean up in 15 seconds
1900 }
1901
1902 if (session[s].ip && !walled_garden && !session[s].die)
1903 {
1904 // RADIUS Stop message
1905 uint16_t r = radiusnew(s);
1906 if (r)
1907 {
1908 // stop, if not already trying
1909 if (radius[r].state != RADIUSSTOP)
1910 {
1911 radius[r].term_cause = term_cause;
1912 radius[r].term_msg = reason;
1913 radiussend(r, RADIUSSTOP);
1914 }
1915 }
1916 else
1917 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1918
1919 // Save counters to dump to accounting file
1920 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1921 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1922 }
1923
1924 if (session[s].ip)
1925 { // IP allocated, clear and unroute
1926 int r;
1927 int routed = 0;
1928 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1929 {
1930 if ((session[s].ip & session[s].route[r].mask) ==
1931 (session[s].route[r].ip & session[s].route[r].mask))
1932 routed++;
1933
1934 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
1935 session[s].route[r].ip = 0;
1936 }
1937
1938 if (session[s].ip_pool_index == -1) // static ip
1939 {
1940 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1941 session[s].ip = 0;
1942 }
1943 else
1944 free_ip_address(s);
1945
1946 // unroute IPv6, if setup
1947 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1948 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1949
1950 if (b)
1951 {
1952 // This session was part of a bundle
1953 bundle[b].num_of_links--;
1954 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1955 if(bundle[b].num_of_links == 0)
1956 {
1957 bundleclear(b);
1958 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1959 }
1960 else
1961 {
1962 // Adjust the members array to accomodate the new change
1963 uint8_t mem_num = 0;
1964 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1965 if(bundle[b].members[bundle[b].num_of_links] != s)
1966 {
1967 uint8_t ml;
1968 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1969 if(bundle[b].members[ml] == s)
1970 {
1971 mem_num = ml;
1972 break;
1973 }
1974 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1975 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
1976 }
1977 }
1978 cluster_send_bundle(b);
1979 }
1980 }
1981
1982 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
1983 throttle_session(s, 0, 0);
1984
1985 if (cdn_result)
1986 { // Send CDN
1987 controlt *c = controlnew(14); // sending CDN
1988 if (cdn_error)
1989 {
1990 uint8_t buf[4];
1991 *(uint16_t *) buf = htons(cdn_result);
1992 *(uint16_t *) (buf+2) = htons(cdn_error);
1993 controlb(c, 1, buf, 4, 1);
1994 }
1995 else
1996 control16(c, 1, cdn_result, 1);
1997
1998 control16(c, 14, s, 1); // assigned session (our end)
1999 controladd(c, session[s].far, session[s].tunnel); // send the message
2000 }
2001
2002 // update filter refcounts
2003 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2004 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2005
2006 // clear PPP state
2007 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2008 sess_local[s].lcp.restart = 0;
2009 sess_local[s].ipcp.restart = 0;
2010 sess_local[s].ipv6cp.restart = 0;
2011 sess_local[s].ccp.restart = 0;
2012
2013 cluster_send_session(s);
2014 }
2015
2016 void sendipcp(sessionidt s, tunnelidt t)
2017 {
2018 uint8_t buf[MAXETHER];
2019 uint8_t *q;
2020
2021 CSTAT(sendipcp);
2022 LOG(3, s, t, "IPCP: send ConfigReq\n");
2023
2024 if (!session[s].unique_id)
2025 {
2026 if (!++last_id) ++last_id; // skip zero
2027 session[s].unique_id = last_id;
2028 }
2029
2030 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2031 if (!q) return;
2032
2033 *q = ConfigReq;
2034 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2035 *(uint16_t *) (q + 2) = htons(10); // packet length
2036 q[4] = 3; // ip address option
2037 q[5] = 6; // option length
2038 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2039 config->bind_address ? config->bind_address :
2040 my_address; // send my IP
2041
2042 tunnelsend(buf, 10 + (q - buf), t); // send it
2043 restart_timer(s, ipcp);
2044 }
2045
2046 void sendipv6cp(sessionidt s, tunnelidt t)
2047 {
2048 uint8_t buf[MAXETHER];
2049 uint8_t *q;
2050
2051 CSTAT(sendipv6cp);
2052 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2053
2054 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2055 if (!q) return;
2056
2057 *q = ConfigReq;
2058 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2059 // only send one type
2060 // of request
2061 *(uint16_t *) (q + 2) = htons(14);
2062 q[4] = 1; // interface identifier option
2063 q[5] = 10; // option length
2064 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2065 *(uint32_t *) (q + 10) = 0;
2066 q[13] = 1;
2067
2068 tunnelsend(buf, 14 + (q - buf), t); // send it
2069 restart_timer(s, ipv6cp);
2070 }
2071
2072 static void sessionclear(sessionidt s)
2073 {
2074 memset(&session[s], 0, sizeof(session[s]));
2075 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2076 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2077
2078 session[s].tunnel = T_FREE; // Mark it as free.
2079 session[s].next = sessionfree;
2080 sessionfree = s;
2081 }
2082
2083 // kill a session now
2084 void sessionkill(sessionidt s, char *reason)
2085 {
2086 CSTAT(sessionkill);
2087
2088 if (!session[s].opened) // not alive
2089 return;
2090
2091 if (session[s].next)
2092 {
2093 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2094 return;
2095 }
2096
2097 if (!session[s].die)
2098 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2099
2100 if (sess_local[s].radius)
2101 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2102
2103 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2104 sessionclear(s);
2105 cluster_send_session(s);
2106 }
2107
2108 static void tunnelclear(tunnelidt t)
2109 {
2110 if (!t) return;
2111 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2112 tunnel[t].state = TUNNELFREE;
2113 }
2114
2115 static void bundleclear(bundleidt b)
2116 {
2117 if (!b) return;
2118 memset(&bundle[b], 0, sizeof(bundle[b]));
2119 bundle[b].state = BUNDLEFREE;
2120 }
2121
2122 // kill a tunnel now
2123 static void tunnelkill(tunnelidt t, char *reason)
2124 {
2125 sessionidt s;
2126 controlt *c;
2127
2128 CSTAT(tunnelkill);
2129
2130 tunnel[t].state = TUNNELDIE;
2131
2132 // free control messages
2133 while ((c = tunnel[t].controls))
2134 {
2135 controlt * n = c->next;
2136 tunnel[t].controls = n;
2137 tunnel[t].controlc--;
2138 c->next = controlfree;
2139 controlfree = c;
2140 }
2141 // kill sessions
2142 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2143 if (session[s].tunnel == t)
2144 sessionkill(s, reason);
2145
2146 // free tunnel
2147 tunnelclear(t);
2148 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2149 cli_tunnel_actions[t].action = 0;
2150 cluster_send_tunnel(t);
2151 }
2152
2153 // shut down a tunnel cleanly
2154 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2155 {
2156 sessionidt s;
2157
2158 CSTAT(tunnelshutdown);
2159
2160 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2161 {
2162 // never set up, can immediately kill
2163 tunnelkill(t, reason);
2164 return;
2165 }
2166 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2167
2168 // close session
2169 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2170 if (session[s].tunnel == t)
2171 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2172
2173 tunnel[t].state = TUNNELDIE;
2174 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2175 cluster_send_tunnel(t);
2176 // TBA - should we wait for sessions to stop?
2177 if (result)
2178 {
2179 controlt *c = controlnew(4); // sending StopCCN
2180 if (error)
2181 {
2182 uint8_t buf[64];
2183 int l = 4;
2184 *(uint16_t *) buf = htons(result);
2185 *(uint16_t *) (buf+2) = htons(error);
2186 if (msg)
2187 {
2188 int m = strlen(msg);
2189 if (m + 4 > sizeof(buf))
2190 m = sizeof(buf) - 4;
2191
2192 memcpy(buf+4, msg, m);
2193 l += m;
2194 }
2195
2196 controlb(c, 1, buf, l, 1);
2197 }
2198 else
2199 control16(c, 1, result, 1);
2200
2201 control16(c, 9, t, 1); // assigned tunnel (our end)
2202 controladd(c, 0, t); // send the message
2203 }
2204 }
2205
2206 // read and process packet on tunnel (UDP)
2207 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2208 {
2209 uint8_t *chapresponse = NULL;
2210 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2211 uint8_t *p = buf + 2;
2212
2213
2214 CSTAT(processudp);
2215
2216 udp_rx += len;
2217 udp_rx_pkt++;
2218 LOG_HEX(5, "UDP Data", buf, len);
2219 STAT(tunnel_rx_packets);
2220 INC_STAT(tunnel_rx_bytes, len);
2221 if (len < 6)
2222 {
2223 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2224 STAT(tunnel_rx_errors);
2225 return;
2226 }
2227 if ((buf[1] & 0x0F) != 2)
2228 {
2229 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2230 STAT(tunnel_rx_errors);
2231 return;
2232 }
2233 if (*buf & 0x40)
2234 { // length
2235 l = ntohs(*(uint16_t *) p);
2236 p += 2;
2237 }
2238 t = ntohs(*(uint16_t *) p);
2239 p += 2;
2240 s = ntohs(*(uint16_t *) p);
2241 p += 2;
2242 if (s >= MAXSESSION)
2243 {
2244 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2245 STAT(tunnel_rx_errors);
2246 return;
2247 }
2248 if (t >= MAXTUNNEL)
2249 {
2250 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2251 STAT(tunnel_rx_errors);
2252 return;
2253 }
2254 if (*buf & 0x08)
2255 { // ns/nr
2256 ns = ntohs(*(uint16_t *) p);
2257 p += 2;
2258 nr = ntohs(*(uint16_t *) p);
2259 p += 2;
2260 }
2261 if (*buf & 0x02)
2262 { // offset
2263 uint16_t o = ntohs(*(uint16_t *) p);
2264 p += o + 2;
2265 }
2266 if ((p - buf) > l)
2267 {
2268 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2269 STAT(tunnel_rx_errors);
2270 return;
2271 }
2272 l -= (p - buf);
2273
2274 // used to time out old tunnels
2275 if (t && tunnel[t].state == TUNNELOPEN)
2276 tunnel[t].lastrec = time_now;
2277
2278 if (*buf & 0x80)
2279 { // control
2280 uint16_t message = 0xFFFF; // message type
2281 uint8_t fatal = 0;
2282 uint8_t mandatory = 0;
2283 uint16_t asession = 0; // assigned session
2284 uint32_t amagic = 0; // magic number
2285 uint8_t aflags = 0; // flags from last LCF
2286 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2287 char called[MAXTEL] = ""; // called number
2288 char calling[MAXTEL] = ""; // calling number
2289
2290 if (!config->cluster_iam_master)
2291 {
2292 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2293 return;
2294 }
2295
2296 // control messages must have bits 0x80|0x40|0x08
2297 // (type, length and sequence) set, and bits 0x02|0x01
2298 // (offset and priority) clear
2299 if ((*buf & 0xCB) != 0xC8)
2300 {
2301 LOG(1, s, t, "Bad control header %02X\n", *buf);
2302 STAT(tunnel_rx_errors);
2303 return;
2304 }
2305
2306 // check for duplicate tunnel open message
2307 if (!t && ns == 0)
2308 {
2309 int i;
2310
2311 //
2312 // Is this a duplicate of the first packet? (SCCRQ)
2313 //
2314 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2315 {
2316 if (tunnel[i].state != TUNNELOPENING ||
2317 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2318 tunnel[i].port != ntohs(addr->sin_port) )
2319 continue;
2320 t = i;
2321 LOG(3, s, t, "Duplicate SCCRQ?\n");
2322 break;
2323 }
2324 }
2325
2326 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2327 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2328
2329 // if no tunnel specified, assign one
2330 if (!t)
2331 {
2332 if (!(t = new_tunnel()))
2333 {
2334 LOG(1, 0, 0, "No more tunnels\n");
2335 STAT(tunnel_overflow);
2336 return;
2337 }
2338 tunnelclear(t);
2339 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2340 tunnel[t].port = ntohs(addr->sin_port);
2341 tunnel[t].window = 4; // default window
2342 STAT(tunnel_created);
2343 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2344 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2345 }
2346
2347 // If the 'ns' just received is not the 'nr' we're
2348 // expecting, just send an ack and drop it.
2349 //
2350 // if 'ns' is less, then we got a retransmitted packet.
2351 // if 'ns' is greater than missed a packet. Either way
2352 // we should ignore it.
2353 if (ns != tunnel[t].nr)
2354 {
2355 // is this the sequence we were expecting?
2356 STAT(tunnel_rx_errors);
2357 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2358 t, ns, tunnel[t].nr);
2359
2360 if (l) // Is this not a ZLB?
2361 controlnull(t);
2362 return;
2363 }
2364
2365 // check sequence of this message
2366 {
2367 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2368 // some to clear maybe?
2369 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2370 {
2371 controlt *c = tunnel[t].controls;
2372 tunnel[t].controls = c->next;
2373 tunnel[t].controlc--;
2374 c->next = controlfree;
2375 controlfree = c;
2376 skip--;
2377 tunnel[t].try = 0; // we have progress
2378 }
2379
2380 // receiver advance (do here so quoted correctly in any sends below)
2381 if (l) tunnel[t].nr = (ns + 1);
2382 if (skip < 0) skip = 0;
2383 if (skip < tunnel[t].controlc)
2384 {
2385 // some control packets can now be sent that were previous stuck out of window
2386 int tosend = tunnel[t].window - skip;
2387 controlt *c = tunnel[t].controls;
2388 while (c && skip)
2389 {
2390 c = c->next;
2391 skip--;
2392 }
2393 while (c && tosend)
2394 {
2395 tunnel[t].try = 0; // first send
2396 tunnelsend(c->buf, c->length, t);
2397 c = c->next;
2398 tosend--;
2399 }
2400 }
2401 if (!tunnel[t].controlc)
2402 tunnel[t].retry = 0; // caught up
2403 }
2404 if (l)
2405 { // if not a null message
2406 int result = 0;
2407 int error = 0;
2408 char *msg = 0;
2409
2410 // Default disconnect cause/message on receipt of CDN. Set to
2411 // more specific value from attribute 1 (result code) or 46
2412 // (disconnect cause) if present below.
2413 int disc_cause_set = 0;
2414 int disc_cause = TERM_NAS_REQUEST;
2415 char const *disc_reason = "Closed (Received CDN).";
2416
2417 // process AVPs
2418 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2419 {
2420 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2421 uint8_t *b = p;
2422 uint8_t flags = *p;
2423 uint16_t mtype;
2424
2425 if (n > l)
2426 {
2427 LOG(1, s, t, "Invalid length in AVP\n");
2428 STAT(tunnel_rx_errors);
2429 return;
2430 }
2431 p += n; // next
2432 l -= n;
2433 if (flags & 0x3C) // reserved bits, should be clear
2434 {
2435 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2436 fatal = flags;
2437 result = 2; // general error
2438 error = 3; // reserved field non-zero
2439 msg = 0;
2440 continue; // next
2441 }
2442 b += 2;
2443 if (*(uint16_t *) (b))
2444 {
2445 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2446 fatal = flags;
2447 result = 2; // general error
2448 error = 6; // generic vendor-specific error
2449 msg = "unsupported vendor-specific";
2450 continue; // next
2451 }
2452 b += 2;
2453 mtype = ntohs(*(uint16_t *) (b));
2454 b += 2;
2455 n -= 6;
2456
2457 if (flags & 0x40)
2458 {
2459 uint16_t orig_len;
2460
2461 // handle hidden AVPs
2462 if (!*config->l2tp_secret)
2463 {
2464 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2465 fatal = flags;
2466 result = 2; // general error
2467 error = 6; // generic vendor-specific error
2468 msg = "secret not specified";
2469 continue;
2470 }
2471 if (!session[s].random_vector_length)
2472 {
2473 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2474 fatal = flags;
2475 result = 2; // general error
2476 error = 6; // generic
2477 msg = "no random vector";
2478 continue;
2479 }
2480 if (n < 8)
2481 {
2482 LOG(2, s, t, "Short hidden AVP.\n");
2483 fatal = flags;
2484 result = 2; // general error
2485 error = 2; // length is wrong
2486 msg = 0;
2487 continue;
2488 }
2489
2490 // Unhide the AVP
2491 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2492
2493 orig_len = ntohs(*(uint16_t *) b);
2494 if (orig_len > n + 2)
2495 {
2496 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2497 orig_len, n);
2498
2499 fatal = flags;
2500 result = 2; // general error
2501 error = 2; // length is wrong
2502 msg = 0;
2503 continue;
2504 }
2505
2506 b += 2;
2507 n = orig_len;
2508 }
2509
2510 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2511 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2512
2513 switch (mtype)
2514 {
2515 case 0: // message type
2516 message = ntohs(*(uint16_t *) b);
2517 mandatory = flags & 0x80;
2518 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2519 break;
2520 case 1: // result code
2521 {
2522 uint16_t rescode = ntohs(*(uint16_t *) b);
2523 char const *resdesc = "(unknown)";
2524 char const *errdesc = NULL;
2525 int cause = 0;
2526
2527 if (message == 4)
2528 { /* StopCCN */
2529 resdesc = l2tp_stopccn_result_code(rescode);
2530 cause = TERM_LOST_SERVICE;
2531 }
2532 else if (message == 14)
2533 { /* CDN */
2534 resdesc = l2tp_cdn_result_code(rescode);
2535 if (rescode == 1)
2536 cause = TERM_LOST_CARRIER;
2537 else
2538 cause = TERM_ADMIN_RESET;
2539 }
2540
2541 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2542 if (n >= 4)
2543 {
2544 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2545 errdesc = l2tp_error_code(errcode);
2546 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2547 }
2548 if (n > 4)
2549 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2550
2551 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2552 {
2553 disc_cause_set = mtype;
2554 disc_reason = errdesc ? errdesc : resdesc;
2555 disc_cause = cause;
2556 }
2557
2558 break;
2559 }
2560 break;
2561 case 2: // protocol version
2562 {
2563 version = ntohs(*(uint16_t *) (b));
2564 LOG(4, s, t, " Protocol version = %u\n", version);
2565 if (version && version != 0x0100)
2566 { // allow 0.0 and 1.0
2567 LOG(1, s, t, " Bad protocol version %04X\n", version);
2568 fatal = flags;
2569 result = 5; // unspported protocol version
2570 error = 0x0100; // supported version
2571 msg = 0;
2572 continue; // next
2573 }
2574 }
2575 break;
2576 case 3: // framing capabilities
2577 break;
2578 case 4: // bearer capabilities
2579 break;
2580 case 5: // tie breaker
2581 // We never open tunnels, so we don't care about tie breakers
2582 continue;
2583 case 6: // firmware revision
2584 break;
2585 case 7: // host name
2586 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2587 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2588 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2589 // TBA - to send to RADIUS
2590 break;
2591 case 8: // vendor name
2592 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2593 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2594 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2595 break;
2596 case 9: // assigned tunnel
2597 tunnel[t].far = ntohs(*(uint16_t *) (b));
2598 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2599 break;
2600 case 10: // rx window
2601 tunnel[t].window = ntohs(*(uint16_t *) (b));
2602 if (!tunnel[t].window)
2603 tunnel[t].window = 1; // window of 0 is silly
2604 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2605 break;
2606 case 11: // Challenge
2607 {
2608 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2609 build_chap_response(b, 2, n, &chapresponse);
2610 }
2611 break;
2612 case 13: // Response
2613 // Why did they send a response? We never challenge.
2614 LOG(2, s, t, " received unexpected challenge response\n");
2615 break;
2616
2617 case 14: // assigned session
2618 asession = session[s].far = ntohs(*(uint16_t *) (b));
2619 LOG(4, s, t, " assigned session = %u\n", asession);
2620 break;
2621 case 15: // call serial number
2622 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2623 break;
2624 case 18: // bearer type
2625 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2626 // TBA - for RADIUS
2627 break;
2628 case 19: // framing type
2629 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2630 // TBA
2631 break;
2632 case 21: // called number
2633 memset(called, 0, sizeof(called));
2634 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2635 LOG(4, s, t, " Called <%s>\n", called);
2636 break;
2637 case 22: // calling number
2638 memset(calling, 0, sizeof(calling));
2639 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2640 LOG(4, s, t, " Calling <%s>\n", calling);
2641 break;
2642 case 23: // subtype
2643 break;
2644 case 24: // tx connect speed
2645 if (n == 4)
2646 {
2647 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2648 }
2649 else
2650 {
2651 // AS5300s send connect speed as a string
2652 char tmp[30];
2653 memset(tmp, 0, sizeof(tmp));
2654 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2655 session[s].tx_connect_speed = atol(tmp);
2656 }
2657 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2658 break;
2659 case 38: // rx connect speed
2660 if (n == 4)
2661 {
2662 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2663 }
2664 else
2665 {
2666 // AS5300s send connect speed as a string
2667 char tmp[30];
2668 memset(tmp, 0, sizeof(tmp));
2669 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2670 session[s].rx_connect_speed = atol(tmp);
2671 }
2672 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2673 break;
2674 case 25: // Physical Channel ID
2675 {
2676 uint32_t tmp = ntohl(*(uint32_t *) b);
2677 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2678 break;
2679 }
2680 case 29: // Proxy Authentication Type
2681 {
2682 uint16_t atype = ntohs(*(uint16_t *)b);
2683 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2684 break;
2685 }
2686 case 30: // Proxy Authentication Name
2687 {
2688 char authname[64];
2689 memset(authname, 0, sizeof(authname));
2690 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2691 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2692 authname);
2693 break;
2694 }
2695 case 31: // Proxy Authentication Challenge
2696 {
2697 LOG(4, s, t, " Proxy Auth Challenge\n");
2698 break;
2699 }
2700 case 32: // Proxy Authentication ID
2701 {
2702 uint16_t authid = ntohs(*(uint16_t *)(b));
2703 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2704 break;
2705 }
2706 case 33: // Proxy Authentication Response
2707 LOG(4, s, t, " Proxy Auth Response\n");
2708 break;
2709 case 27: // last sent lcp
2710 { // find magic number
2711 uint8_t *p = b, *e = p + n;
2712 while (p + 1 < e && p[1] && p + p[1] <= e)
2713 {
2714 if (*p == 5 && p[1] == 6) // Magic-Number
2715 amagic = ntohl(*(uint32_t *) (p + 2));
2716 else if (*p == 7) // Protocol-Field-Compression
2717 aflags |= SESSION_PFC;
2718 else if (*p == 8) // Address-and-Control-Field-Compression
2719 aflags |= SESSION_ACFC;
2720 p += p[1];
2721 }
2722 }
2723 break;
2724 case 28: // last recv lcp confreq
2725 break;
2726 case 26: // Initial Received LCP CONFREQ
2727 break;
2728 case 39: // seq required - we control it as an LNS anyway...
2729 break;
2730 case 36: // Random Vector
2731 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2732 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2733 if (n > sizeof(session[s].random_vector))
2734 n = sizeof(session[s].random_vector);
2735 memcpy(session[s].random_vector, b, n);
2736 session[s].random_vector_length = n;
2737 break;
2738 case 46: // ppp disconnect cause
2739 if (n >= 5)
2740 {
2741 uint16_t code = ntohs(*(uint16_t *) b);
2742 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2743 uint8_t dir = *(b + 4);
2744
2745 LOG(4, s, t, " PPP disconnect cause "
2746 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2747 code, proto, dir, n - 5, b + 5);
2748
2749 disc_cause_set = mtype;
2750
2751 switch (code)
2752 {
2753 case 1: // admin disconnect
2754 disc_cause = TERM_ADMIN_RESET;
2755 disc_reason = "Administrative disconnect";
2756 break;
2757 case 3: // lcp terminate
2758 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2759 disc_cause = TERM_USER_REQUEST;
2760 disc_reason = "Normal disconnection";
2761 break;
2762 case 4: // compulsory encryption unavailable
2763 if (dir != 1) break; // 1=refused by peer, 2=local
2764 disc_cause = TERM_USER_ERROR;
2765 disc_reason = "Compulsory encryption refused";
2766 break;
2767 case 5: // lcp: fsm timeout
2768 disc_cause = TERM_PORT_ERROR;
2769 disc_reason = "LCP: FSM timeout";
2770 break;
2771 case 6: // lcp: no recognisable lcp packets received
2772 disc_cause = TERM_PORT_ERROR;
2773 disc_reason = "LCP: no recognisable LCP packets";
2774 break;
2775 case 7: // lcp: magic-no error (possibly looped back)
2776 disc_cause = TERM_PORT_ERROR;
2777 disc_reason = "LCP: magic-no error (possible loop)";
2778 break;
2779 case 8: // lcp: echo request timeout
2780 disc_cause = TERM_PORT_ERROR;
2781 disc_reason = "LCP: echo request timeout";
2782 break;
2783 case 13: // auth: fsm timeout
2784 disc_cause = TERM_SERVICE_UNAVAILABLE;
2785 disc_reason = "Authentication: FSM timeout";
2786 break;
2787 case 15: // auth: unacceptable auth protocol
2788 disc_cause = TERM_SERVICE_UNAVAILABLE;
2789 disc_reason = "Unacceptable authentication protocol";
2790 break;
2791 case 16: // auth: authentication failed
2792 disc_cause = TERM_SERVICE_UNAVAILABLE;
2793 disc_reason = "Authentication failed";
2794 break;
2795 case 17: // ncp: fsm timeout
2796 disc_cause = TERM_SERVICE_UNAVAILABLE;
2797 disc_reason = "NCP: FSM timeout";
2798 break;
2799 case 18: // ncp: no ncps available
2800 disc_cause = TERM_SERVICE_UNAVAILABLE;
2801 disc_reason = "NCP: no NCPs available";
2802 break;
2803 case 19: // ncp: failure to converge on acceptable address
2804 disc_cause = TERM_SERVICE_UNAVAILABLE;
2805 disc_reason = (dir == 1)
2806 ? "NCP: too many Configure-Naks received from peer"
2807 : "NCP: too many Configure-Naks sent to peer";
2808 break;
2809 case 20: // ncp: user not permitted to use any address
2810 disc_cause = TERM_SERVICE_UNAVAILABLE;
2811 disc_reason = (dir == 1)
2812 ? "NCP: local link address not acceptable to peer"
2813 : "NCP: remote link address not acceptable";
2814 break;
2815 }
2816 }
2817 break;
2818 default:
2819 {
2820 static char e[] = "unknown AVP 0xXXXX";
2821 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2822 fatal = flags;
2823 result = 2; // general error
2824 error = 8; // unknown mandatory AVP
2825 sprintf((msg = e) + 14, "%04x", mtype);
2826 continue; // next
2827 }
2828 }
2829 }
2830 // process message
2831 if (fatal & 0x80)
2832 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2833 else
2834 switch (message)
2835 {
2836 case 1: // SCCRQ - Start Control Connection Request
2837 tunnel[t].state = TUNNELOPENING;
2838 if (main_quit != QUIT_SHUTDOWN)
2839 {
2840 controlt *c = controlnew(2); // sending SCCRP
2841 control16(c, 2, version, 1); // protocol version
2842 control32(c, 3, 3, 1); // framing
2843 controls(c, 7, hostname, 1); // host name
2844 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2845 control16(c, 9, t, 1); // assigned tunnel
2846 controladd(c, 0, t); // send the resply
2847 }
2848 else
2849 {
2850 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2851 }
2852 break;
2853 case 2: // SCCRP
2854 tunnel[t].state = TUNNELOPEN;
2855 tunnel[t].lastrec = time_now;
2856 break;
2857 case 3: // SCCN
2858 tunnel[t].state = TUNNELOPEN;
2859 tunnel[t].lastrec = time_now;
2860 controlnull(t); // ack
2861 break;
2862 case 4: // StopCCN
2863 controlnull(t); // ack
2864 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2865 break;
2866 case 6: // HELLO
2867 controlnull(t); // simply ACK
2868 break;
2869 case 7: // OCRQ
2870 // TBA
2871 break;
2872 case 8: // OCRO
2873 // TBA
2874 break;
2875 case 9: // OCCN
2876 // TBA
2877 break;
2878 case 10: // ICRQ
2879 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2880 {
2881 controlt *c = controlnew(11); // ICRP
2882
2883 s = sessionfree;
2884 sessionfree = session[s].next;
2885 memset(&session[s], 0, sizeof(session[s]));
2886
2887 if (s > config->cluster_highest_sessionid)
2888 config->cluster_highest_sessionid = s;
2889
2890 session[s].opened = time_now;
2891 session[s].tunnel = t;
2892 session[s].far = asession;
2893 session[s].last_packet = session[s].last_data = time_now;
2894 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2895 control16(c, 14, s, 1); // assigned session
2896 controladd(c, asession, t); // send the reply
2897
2898 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2899 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2900
2901 session[s].ppp.phase = Establish;
2902 session[s].ppp.lcp = Starting;
2903
2904 STAT(session_created);
2905 break;
2906 }
2907
2908 {
2909 controlt *c = controlnew(14); // CDN
2910 if (!sessionfree)
2911 {
2912 STAT(session_overflow);
2913 LOG(1, 0, t, "No free sessions\n");
2914 control16(c, 1, 4, 0); // temporary lack of resources
2915 }
2916 else
2917 control16(c, 1, 2, 7); // shutting down, try another
2918
2919 controladd(c, asession, t); // send the message
2920 }
2921 return;
2922 case 11: // ICRP
2923 // TBA
2924 break;
2925 case 12: // ICCN
2926 if (amagic == 0) amagic = time_now;
2927 session[s].magic = amagic; // set magic number
2928 session[s].flags = aflags; // set flags received
2929 session[s].mru = PPPoE_MRU; // default
2930 controlnull(t); // ack
2931
2932 // start LCP
2933 sess_local[s].lcp_authtype = config->radius_authprefer;
2934 sess_local[s].ppp_mru = MRU;
2935
2936 // Set multilink options before sending initial LCP packet
2937 sess_local[s].mp_mrru = 1614;
2938 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2939
2940 sendlcp(s, t);
2941 change_state(s, lcp, RequestSent);
2942 break;
2943
2944 case 14: // CDN
2945 controlnull(t); // ack
2946 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2947 break;
2948 case 0xFFFF:
2949 LOG(1, s, t, "Missing message type\n");
2950 break;
2951 default:
2952 STAT(tunnel_rx_errors);
2953 if (mandatory)
2954 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2955 else
2956 LOG(1, s, t, "Unknown message type %u\n", message);
2957 break;
2958 }
2959 if (chapresponse) free(chapresponse);
2960 cluster_send_tunnel(t);
2961 }
2962 else
2963 {
2964 LOG(4, s, t, " Got a ZLB ack\n");
2965 }
2966 }
2967 else
2968 { // data
2969 uint16_t proto;
2970
2971 LOG_HEX(5, "Receive Tunnel Data", p, l);
2972 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2973 { // HDLC address header, discard
2974 p += 2;
2975 l -= 2;
2976 }
2977 if (l < 2)
2978 {
2979 LOG(1, s, t, "Short ppp length %d\n", l);
2980 STAT(tunnel_rx_errors);
2981 return;
2982 }
2983 if (*p & 1)
2984 {
2985 proto = *p++;
2986 l--;
2987 }
2988 else
2989 {
2990 proto = ntohs(*(uint16_t *) p);
2991 p += 2;
2992 l -= 2;
2993 }
2994
2995 if (s && !session[s].opened) // Is something wrong??
2996 {
2997 if (!config->cluster_iam_master)
2998 {
2999 // Pass it off to the master to deal with..
3000 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3001 return;
3002 }
3003
3004
3005 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3006 STAT(tunnel_rx_errors);
3007 return;
3008 }
3009
3010 if (proto == PPPPAP)
3011 {
3012 session[s].last_packet = time_now;
3013 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3014 processpap(s, t, p, l);
3015 }
3016 else if (proto == PPPCHAP)
3017 {
3018 session[s].last_packet = time_now;
3019 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3020 processchap(s, t, p, l);
3021 }
3022 else if (proto == PPPLCP)
3023 {
3024 session[s].last_packet = time_now;
3025 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3026 processlcp(s, t, p, l);
3027 }
3028 else if (proto == PPPIPCP)
3029 {
3030 session[s].last_packet = time_now;
3031 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3032 processipcp(s, t, p, l);
3033 }
3034 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3035 {
3036 session[s].last_packet = time_now;
3037 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3038 processipv6cp(s, t, p, l);
3039 }
3040 else if (proto == PPPCCP)
3041 {
3042 session[s].last_packet = time_now;
3043 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3044 processccp(s, t, p, l);
3045 }
3046 else if (proto == PPPIP)
3047 {
3048 if (session[s].die)
3049 {
3050 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3051 return; // closing session, PPP not processed
3052 }
3053
3054 session[s].last_packet = session[s].last_data = time_now;
3055 if (session[s].walled_garden && !config->cluster_iam_master)
3056 {
3057 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3058 return;
3059 }
3060
3061 processipin(s, t, p, l);
3062 }
3063 else if (proto == PPPMP)
3064 {
3065 if (session[s].die)
3066 {
3067 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3068 return; // closing session, PPP not processed
3069 }
3070
3071 session[s].last_packet = session[s].last_data = time_now;
3072 if (session[s].walled_garden && !config->cluster_iam_master)
3073 {
3074 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3075 return;
3076 }
3077
3078 processmpin(s, t, p, l);
3079 }
3080 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3081 {
3082 if (session[s].die)
3083 {
3084 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3085 return; // closing session, PPP not processed
3086 }
3087
3088 session[s].last_packet = session[s].last_data = time_now;
3089 if (session[s].walled_garden && !config->cluster_iam_master)
3090 {
3091 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3092 return;
3093 }
3094
3095 processipv6in(s, t, p, l);
3096 }
3097 else if (session[s].ppp.lcp == Opened)
3098 {
3099 session[s].last_packet = time_now;
3100 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3101 protoreject(s, t, p, l, proto);
3102 }
3103 else
3104 {
3105 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3106 proto, ppp_state(session[s].ppp.lcp));
3107 }
3108 }
3109 }
3110
3111 // read and process packet on tun
3112 static void processtun(uint8_t * buf, int len)
3113 {
3114 LOG_HEX(5, "Receive TUN Data", buf, len);
3115 STAT(tun_rx_packets);
3116 INC_STAT(tun_rx_bytes, len);
3117
3118 CSTAT(processtun);
3119
3120 eth_rx_pkt++;
3121 eth_rx += len;
3122 if (len < 22)
3123 {
3124 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3125 STAT(tun_rx_errors);
3126 return;
3127 }
3128
3129 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3130 processipout(buf, len);
3131 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3132 && config->ipv6_prefix.s6_addr[0])
3133 processipv6out(buf, len);
3134
3135 // Else discard.
3136 }
3137
3138 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3139 // that we look at the whole of the tunnel, radius and session tables
3140 // every second
3141 static void regular_cleanups(double period)
3142 {
3143 // Next tunnel, radius and session to check for actions on.
3144 static tunnelidt t = 0;
3145 static int r = 0;
3146 static sessionidt s = 0;
3147
3148 int t_actions = 0;
3149 int r_actions = 0;
3150 int s_actions = 0;
3151
3152 int t_slice;
3153 int r_slice;
3154 int s_slice;
3155
3156 int i;
3157 int a;
3158
3159 // divide up tables into slices based on the last run
3160 t_slice = config->cluster_highest_tunnelid * period;
3161 r_slice = (MAXRADIUS - 1) * period;
3162 s_slice = config->cluster_highest_sessionid * period;
3163
3164 if (t_slice < 1)
3165 t_slice = 1;
3166 else if (t_slice > config->cluster_highest_tunnelid)
3167 t_slice = config->cluster_highest_tunnelid;
3168
3169 if (r_slice < 1)
3170 r_slice = 1;
3171 else if (r_slice > (MAXRADIUS - 1))
3172 r_slice = MAXRADIUS - 1;
3173
3174 if (s_slice < 1)
3175 s_slice = 1;
3176 else if (s_slice > config->cluster_highest_sessionid)
3177 s_slice = config->cluster_highest_sessionid;
3178
3179 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3180
3181 for (i = 0; i < t_slice; i++)
3182 {
3183 t++;
3184 if (t > config->cluster_highest_tunnelid)
3185 t = 1;
3186
3187 // check for expired tunnels
3188 if (tunnel[t].die && tunnel[t].die <= TIME)
3189 {
3190 STAT(tunnel_timeout);
3191 tunnelkill(t, "Expired");
3192 t_actions++;
3193 continue;
3194 }
3195 // check for message resend
3196 if (tunnel[t].retry && tunnel[t].controlc)
3197 {
3198 // resend pending messages as timeout on reply
3199 if (tunnel[t].retry <= TIME)
3200 {
3201 controlt *c = tunnel[t].controls;
3202 uint16_t w = tunnel[t].window;
3203 tunnel[t].try++; // another try
3204 if (tunnel[t].try > 5)
3205 tunnelkill(t, "Timeout on control message"); // game over
3206 else
3207 while (c && w--)
3208 {
3209 tunnelsend(c->buf, c->length, t);
3210 c = c->next;
3211 }
3212
3213 t_actions++;
3214 }
3215 }
3216 // Send hello
3217 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3218 {
3219 controlt *c = controlnew(6); // sending HELLO
3220 controladd(c, 0, t); // send the message
3221 LOG(3, 0, t, "Sending HELLO message\n");
3222 t_actions++;
3223 }
3224
3225 // Check for tunnel changes requested from the CLI
3226 if ((a = cli_tunnel_actions[t].action))
3227 {
3228 cli_tunnel_actions[t].action = 0;
3229 if (a & CLI_TUN_KILL)
3230 {
3231 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3232 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3233 t_actions++;
3234 }
3235 }
3236 }
3237
3238 for (i = 0; i < r_slice; i++)
3239 {
3240 r++;
3241 if (r >= MAXRADIUS)
3242 r = 1;
3243
3244 if (!radius[r].state)
3245 continue;
3246
3247 if (radius[r].retry <= TIME)
3248 {
3249 radiusretry(r);
3250 r_actions++;
3251 }
3252 }
3253
3254 for (i = 0; i < s_slice; i++)
3255 {
3256 s++;
3257 if (s > config->cluster_highest_sessionid)
3258 s = 1;
3259
3260 if (!session[s].opened) // Session isn't in use
3261 continue;
3262
3263 // check for expired sessions
3264 if (session[s].die)
3265 {
3266 if (session[s].die <= TIME)
3267 {
3268 sessionkill(s, "Expired");
3269 s_actions++;
3270 }
3271 continue;
3272 }
3273
3274 // PPP timeouts
3275 if (sess_local[s].lcp.restart <= time_now)
3276 {
3277 int next_state = session[s].ppp.lcp;
3278 switch (session[s].ppp.lcp)
3279 {
3280 case RequestSent:
3281 case AckReceived:
3282 next_state = RequestSent;
3283
3284 case AckSent:
3285 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3286 {
3287 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3288 sendlcp(s, session[s].tunnel);
3289 change_state(s, lcp, next_state);
3290 }
3291 else
3292 {
3293 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3294 STAT(session_timeout);
3295 }
3296
3297 s_actions++;
3298 }
3299
3300 if (session[s].die)
3301 continue;
3302 }
3303
3304 if (sess_local[s].ipcp.restart <= time_now)
3305 {
3306 int next_state = session[s].ppp.ipcp;
3307 switch (session[s].ppp.ipcp)
3308 {
3309 case RequestSent:
3310 case AckReceived:
3311 next_state = RequestSent;
3312
3313 case AckSent:
3314 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3315 {
3316 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3317 sendipcp(s, session[s].tunnel);
3318 change_state(s, ipcp, next_state);
3319 }
3320 else
3321 {
3322 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3323 STAT(session_timeout);
3324 }
3325
3326 s_actions++;
3327 }
3328
3329 if (session[s].die)
3330 continue;
3331 }
3332
3333 if (sess_local[s].ipv6cp.restart <= time_now)
3334 {
3335 int next_state = session[s].ppp.ipv6cp;
3336 switch (session[s].ppp.ipv6cp)
3337 {
3338 case RequestSent:
3339 case AckReceived:
3340 next_state = RequestSent;
3341
3342 case AckSent:
3343 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3344 {
3345 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3346 sendipv6cp(s, session[s].tunnel);
3347 change_state(s, ipv6cp, next_state);
3348 }
3349 else
3350 {
3351 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3352 change_state(s, ipv6cp, Stopped);
3353 }
3354
3355 s_actions++;
3356 }
3357 }
3358
3359 if (sess_local[s].ccp.restart <= time_now)
3360 {
3361 int next_state = session[s].ppp.ccp;
3362 switch (session[s].ppp.ccp)
3363 {
3364 case RequestSent:
3365 case AckReceived:
3366 next_state = RequestSent;
3367
3368 case AckSent:
3369 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3370 {
3371 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3372 sendccp(s, session[s].tunnel);
3373 change_state(s, ccp, next_state);
3374 }
3375 else
3376 {
3377 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3378 change_state(s, ccp, Stopped);
3379 }
3380
3381 s_actions++;
3382 }
3383 }
3384
3385 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3386 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3387 {
3388 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3389 STAT(session_timeout);
3390 s_actions++;
3391 continue;
3392 }
3393
3394 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3395 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3396 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3397 {
3398 uint8_t b[MAXETHER];
3399
3400 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3401 if (!q) continue;
3402
3403 *q = EchoReq;
3404 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3405 *(uint16_t *)(q + 2) = htons(8); // Length
3406 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3407
3408 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3409 (int)(time_now - session[s].last_packet));
3410 tunnelsend(b, 24, session[s].tunnel); // send it
3411 sess_local[s].last_echo = time_now;
3412 s_actions++;
3413 }
3414
3415 // Drop sessions who have reached session_timeout seconds
3416 if (session[s].session_timeout)
3417 {
3418 bundleidt bid = session[s].bundle;
3419 if (bid)
3420 {
3421 if (time_now - bundle[bid].last_check >= 1)
3422 {
3423 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3424 bundle[bid].last_check = time_now;
3425 if (bundle[bid].online_time >= session[s].session_timeout)
3426 {
3427 int ses;
3428 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3429 {
3430 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3431 s_actions++;
3432 continue;
3433 }
3434 }
3435 }
3436 }
3437 else if (time_now - session[s].opened >= session[s].session_timeout)
3438 {
3439 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3440 s_actions++;
3441 continue;
3442 }
3443 }
3444
3445 // Drop sessions who have reached idle_timeout seconds
3446 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3447 {
3448 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3449 STAT(session_timeout);
3450 s_actions++;
3451 continue;
3452 }
3453
3454 // Check for actions requested from the CLI
3455 if ((a = cli_session_actions[s].action))
3456 {
3457 int send = 0;
3458
3459 cli_session_actions[s].action = 0;
3460 if (a & CLI_SESS_KILL)
3461 {
3462 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3463 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3464 a = 0; // dead, no need to check for other actions
3465 s_actions++;
3466 }
3467
3468 if (a & CLI_SESS_NOSNOOP)
3469 {
3470 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3471 session[s].snoop_ip = 0;
3472 session[s].snoop_port = 0;
3473 s_actions++;
3474 send++;
3475 }
3476 else if (a & CLI_SESS_SNOOP)
3477 {
3478 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3479 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3480 cli_session_actions[s].snoop_port);
3481
3482 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3483 session[s].snoop_port = cli_session_actions[s].snoop_port;
3484 s_actions++;
3485 send++;
3486 }
3487
3488 if (a & CLI_SESS_NOTHROTTLE)
3489 {
3490 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3491 throttle_session(s, 0, 0);
3492 s_actions++;
3493 send++;
3494 }
3495 else if (a & CLI_SESS_THROTTLE)
3496 {
3497 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3498 cli_session_actions[s].throttle_in,
3499 cli_session_actions[s].throttle_out);
3500
3501 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3502 s_actions++;
3503 send++;
3504 }
3505
3506 if (a & CLI_SESS_NOFILTER)
3507 {
3508 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3509 filter_session(s, 0, 0);
3510 s_actions++;
3511 send++;
3512 }
3513 else if (a & CLI_SESS_FILTER)
3514 {
3515 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3516 cli_session_actions[s].filter_in,
3517 cli_session_actions[s].filter_out);
3518
3519 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3520 s_actions++;
3521 send++;
3522 }
3523
3524 if (send)
3525 cluster_send_session(s);
3526 }
3527
3528 // RADIUS interim accounting
3529 if (config->radius_accounting && config->radius_interim > 0
3530 && session[s].ip && !session[s].walled_garden
3531 && !sess_local[s].radius // RADIUS already in progress
3532 && time_now - sess_local[s].last_interim >= config->radius_interim
3533 && session[s].flags & SESSION_STARTED)
3534 {
3535 int rad = radiusnew(s);
3536 if (!rad)
3537 {
3538 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3539 STAT(radius_overflow);
3540 continue;
3541 }
3542
3543 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3544 session[s].user, session[s].unique_id);
3545
3546 radiussend(rad, RADIUSINTERIM);
3547 sess_local[s].last_interim = time_now;
3548 s_actions++;
3549 }
3550 }
3551
3552 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3553 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3554 }
3555
3556 //
3557 // Are we in the middle of a tunnel update, or radius
3558 // requests??
3559 //
3560 static int still_busy(void)
3561 {
3562 int i;
3563 static clockt last_talked = 0;
3564 static clockt start_busy_wait = 0;
3565
3566 if (!config->cluster_iam_master)
3567 {
3568 #ifdef BGP
3569 static time_t stopped_bgp = 0;
3570 if (bgp_configured)
3571 {
3572 if (!stopped_bgp)
3573 {
3574 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3575
3576 for (i = 0; i < BGP_NUM_PEERS; i++)
3577 if (bgp_peers[i].state == Established)
3578 bgp_stop(&bgp_peers[i]);
3579
3580 stopped_bgp = time_now;
3581
3582 // we don't want to become master
3583 cluster_send_ping(0);
3584
3585 return 1;
3586 }
3587
3588 if (time_now < (stopped_bgp + QUIT_DELAY))
3589 return 1;
3590 }
3591 #endif /* BGP */
3592
3593 return 0;
3594 }
3595
3596 if (main_quit == QUIT_SHUTDOWN)
3597 {
3598 static int dropped = 0;
3599 if (!dropped)
3600 {
3601 int i;
3602
3603 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3604 for (i = 1; i < MAXTUNNEL; i++)
3605 if (tunnel[i].ip || tunnel[i].state)
3606 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3607
3608 dropped = 1;
3609 }
3610 }
3611
3612 if (start_busy_wait == 0)
3613 start_busy_wait = TIME;
3614
3615 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3616 {
3617 if (!tunnel[i].controlc)
3618 continue;
3619
3620 if (last_talked != TIME)
3621 {
3622 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3623 last_talked = TIME;
3624 }
3625 return 1;
3626 }
3627
3628 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3629 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3630 {
3631 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3632 return 0;
3633 }
3634
3635 for (i = 1; i < MAXRADIUS; i++)
3636 {
3637 if (radius[i].state == RADIUSNULL)
3638 continue;
3639 if (radius[i].state == RADIUSWAIT)
3640 continue;
3641
3642 if (last_talked != TIME)
3643 {
3644 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3645 last_talked = TIME;
3646 }
3647 return 1;
3648 }
3649
3650 return 0;
3651 }
3652
3653 #ifdef HAVE_EPOLL
3654 # include <sys/epoll.h>
3655 #else
3656 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3657 # include "fake_epoll.h"
3658 #endif
3659
3660 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3661 #define BASE_FDS 7
3662
3663 // additional polled fds
3664 #ifdef BGP
3665 # define EXTRA_FDS BGP_NUM_PEERS
3666 #else
3667 # define EXTRA_FDS 0
3668 #endif
3669
3670 // main loop - gets packets on tun or udp and processes them
3671 static void mainloop(void)
3672 {
3673 int i;
3674 uint8_t buf[65536];
3675 clockt next_cluster_ping = 0; // send initial ping immediately
3676 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3677 int maxevent = sizeof(events)/sizeof(*events);
3678
3679 if ((epollfd = epoll_create(maxevent)) < 0)
3680 {
3681 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3682 exit(1);
3683 }
3684
3685 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3686 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3687
3688 /* setup our fds to poll for input */
3689 {
3690 static struct event_data d[BASE_FDS];
3691 struct epoll_event e;
3692
3693 e.events = EPOLLIN;
3694 i = 0;
3695
3696 if (clifd >= 0)
3697 {
3698 d[i].type = FD_TYPE_CLI;
3699 e.data.ptr = &d[i++];
3700 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3701 }
3702
3703 d[i].type = FD_TYPE_CLUSTER;
3704 e.data.ptr = &d[i++];
3705 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3706
3707 d[i].type = FD_TYPE_TUN;
3708 e.data.ptr = &d[i++];
3709 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3710
3711 d[i].type = FD_TYPE_UDP;
3712 e.data.ptr = &d[i++];
3713 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3714
3715 d[i].type = FD_TYPE_CONTROL;
3716 e.data.ptr = &d[i++];
3717 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3718
3719 d[i].type = FD_TYPE_DAE;
3720 e.data.ptr = &d[i++];
3721 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3722
3723 d[i].type = FD_TYPE_NETLINK;
3724 e.data.ptr = &d[i++];
3725 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3726 }
3727
3728 #ifdef BGP
3729 signal(SIGPIPE, SIG_IGN);
3730 bgp_setup(config->as_number);
3731 if (config->bind_address)
3732 bgp_add_route(config->bind_address, 0xffffffff);
3733
3734 for (i = 0; i < BGP_NUM_PEERS; i++)
3735 {
3736 if (config->neighbour[i].name[0])
3737 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3738 config->neighbour[i].as, config->neighbour[i].keepalive,
3739 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3740 }
3741 #endif /* BGP */
3742
3743 while (!main_quit || still_busy())
3744 {
3745 int more = 0;
3746 int n;
3747
3748
3749 if (main_reload)
3750 {
3751 main_reload = 0;
3752 read_config_file();
3753 config->reload_config++;
3754 }
3755
3756 if (config->reload_config)
3757 {
3758 config->reload_config = 0;
3759 update_config();
3760 }
3761
3762 #ifdef BGP
3763 bgp_set_poll();
3764 #endif /* BGP */
3765
3766 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3767 STAT(select_called);
3768
3769 TIME = now(NULL);
3770 if (n < 0)
3771 {
3772 if (errno == EINTR ||
3773 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3774 continue;
3775
3776 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3777 break; // exit
3778 }
3779
3780 if (n)
3781 {
3782 struct sockaddr_in addr;
3783 struct in_addr local;
3784 socklen_t alen;
3785 int c, s;
3786 int udp_ready = 0;
3787 int tun_ready = 0;
3788 int cluster_ready = 0;
3789 int udp_pkts = 0;
3790 int tun_pkts = 0;
3791 int cluster_pkts = 0;
3792 #ifdef BGP
3793 uint32_t bgp_events[BGP_NUM_PEERS];
3794 memset(bgp_events, 0, sizeof(bgp_events));
3795 #endif /* BGP */
3796
3797 for (c = n, i = 0; i < c; i++)
3798 {
3799 struct event_data *d = events[i].data.ptr;
3800
3801 switch (d->type)
3802 {
3803 case FD_TYPE_CLI: // CLI connections
3804 {
3805 int cli;
3806
3807 alen = sizeof(addr);
3808 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3809 {
3810 cli_do(cli);
3811 close(cli);
3812 }
3813 else
3814 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3815
3816 n--;
3817 break;
3818 }
3819
3820 // these are handled below, with multiple interleaved reads
3821 case FD_TYPE_CLUSTER: cluster_ready++; break;
3822 case FD_TYPE_TUN: tun_ready++; break;
3823 case FD_TYPE_UDP: udp_ready++; break;
3824
3825 case FD_TYPE_CONTROL: // nsctl commands
3826 alen = sizeof(addr);
3827 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3828 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3829 n--;
3830 break;
3831
3832 case FD_TYPE_DAE: // DAE requests
3833 alen = sizeof(addr);
3834 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3835 if (s > 0) processdae(buf, s, &addr, alen, &local);
3836 n--;
3837 break;
3838
3839 case FD_TYPE_RADIUS: // RADIUS response
3840 alen = sizeof(addr);
3841 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3842 if (s >= 0 && config->cluster_iam_master)
3843 {
3844 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3845 addr.sin_addr.s_addr == config->radiusserver[1])
3846 processrad(buf, s, d->index);
3847 else
3848 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3849 fmtaddr(addr.sin_addr.s_addr, 0));
3850 }
3851
3852 n--;
3853 break;
3854
3855 #ifdef BGP
3856 case FD_TYPE_BGP:
3857 bgp_events[d->index] = events[i].events;
3858 n--;
3859 break;
3860 #endif /* BGP */
3861
3862 case FD_TYPE_NETLINK:
3863 {
3864 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
3865 s = netlink_recv(buf, sizeof(buf));
3866 if (nh->nlmsg_type == NLMSG_ERROR)
3867 {
3868 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
3869 if (errmsg->error)
3870 {
3871 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
3872 {
3873 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
3874 exit(1);
3875 }
3876 else
3877
3878 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
3879 }
3880 // else it's a ack
3881 }
3882 else
3883 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);
3884 n--;
3885 break;
3886 }
3887
3888 default:
3889 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3890 }
3891 }
3892
3893 #ifdef BGP
3894 bgp_process(bgp_events);
3895 #endif /* BGP */
3896
3897 for (c = 0; n && c < config->multi_read_count; c++)
3898 {
3899 // L2TP
3900 if (udp_ready)
3901 {
3902 alen = sizeof(addr);
3903 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3904 {
3905 processudp(buf, s, &addr);
3906 udp_pkts++;
3907 }
3908 else
3909 {
3910 udp_ready = 0;
3911 n--;
3912 }
3913 }
3914
3915 // incoming IP
3916 if (tun_ready)
3917 {
3918 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3919 {
3920 processtun(buf, s);
3921 tun_pkts++;
3922 }
3923 else
3924 {
3925 tun_ready = 0;
3926 n--;
3927 }
3928 }
3929
3930 // cluster
3931 if (cluster_ready)
3932 {
3933 alen = sizeof(addr);
3934 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3935 {
3936 processcluster(buf, s, addr.sin_addr.s_addr);
3937 cluster_pkts++;
3938 }
3939 else
3940 {
3941 cluster_ready = 0;
3942 n--;
3943 }
3944 }
3945 }
3946
3947 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3948 STAT(multi_read_used);
3949
3950 if (c >= config->multi_read_count)
3951 {
3952 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3953 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3954
3955 STAT(multi_read_exceeded);
3956 more++;
3957 }
3958 }
3959
3960 if (time_changed)
3961 {
3962 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3963
3964 // Log current traffic stats
3965 snprintf(config->bandwidth, sizeof(config->bandwidth),
3966 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3967 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3968 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
3969 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
3970
3971 udp_tx = udp_rx = 0;
3972 udp_rx_pkt = eth_rx_pkt = 0;
3973 eth_tx = eth_rx = 0;
3974 time_changed = 0;
3975
3976 if (config->dump_speed)
3977 printf("%s\n", config->bandwidth);
3978
3979 // Update the internal time counter
3980 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3981
3982 {
3983 // Run timer hooks
3984 struct param_timer p = { time_now };
3985 run_plugins(PLUGIN_TIMER, &p);
3986 }
3987 }
3988
3989 // Runs on every machine (master and slaves).
3990 if (next_cluster_ping <= TIME)
3991 {
3992 // Check to see which of the cluster is still alive..
3993
3994 cluster_send_ping(basetime); // Only does anything if we're a slave
3995 cluster_check_master(); // ditto.
3996
3997 cluster_heartbeat(); // Only does anything if we're a master.
3998 cluster_check_slaves(); // ditto.
3999
4000 master_update_counts(); // If we're a slave, send our byte counters to our master.
4001
4002 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4003 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4004 else
4005 next_cluster_ping = TIME + config->cluster_hb_interval;
4006 }
4007
4008 if (!config->cluster_iam_master)
4009 continue;
4010
4011 // Run token bucket filtering queue..
4012 // Only run it every 1/10th of a second.
4013 {
4014 static clockt last_run = 0;
4015 if (last_run != TIME)
4016 {
4017 last_run = TIME;
4018 tbf_run_timer();
4019 }
4020 }
4021
4022 // Handle timeouts, retries etc.
4023 {
4024 static double last_clean = 0;
4025 double this_clean;
4026 double diff;
4027
4028 TIME = now(&this_clean);
4029 diff = this_clean - last_clean;
4030
4031 // Run during idle time (after we've handled
4032 // all incoming packets) or every 1/10th sec
4033 if (!more || diff > 0.1)
4034 {
4035 regular_cleanups(diff);
4036 last_clean = this_clean;
4037 }
4038 }
4039
4040 if (*config->accounting_dir)
4041 {
4042 static clockt next_acct = 0;
4043 static clockt next_shut_acct = 0;
4044
4045 if (next_acct <= TIME)
4046 {
4047 // Dump accounting data
4048 next_acct = TIME + ACCT_TIME;
4049 next_shut_acct = TIME + ACCT_SHUT_TIME;
4050 dump_acct_info(1);
4051 }
4052 else if (next_shut_acct <= TIME)
4053 {
4054 // Dump accounting data for shutdown sessions
4055 next_shut_acct = TIME + ACCT_SHUT_TIME;
4056 if (shut_acct_n)
4057 dump_acct_info(0);
4058 }
4059 }
4060 }
4061
4062 // Are we the master and shutting down??
4063 if (config->cluster_iam_master)
4064 cluster_heartbeat(); // Flush any queued changes..
4065
4066 // Ok. Notify everyone we're shutting down. If we're
4067 // the master, this will force an election.
4068 cluster_send_ping(0);
4069
4070 //
4071 // Important!!! We MUST not process any packets past this point!
4072 LOG(1, 0, 0, "Shutdown complete\n");
4073 }
4074
4075 static void stripdomain(char *host)
4076 {
4077 char *p;
4078
4079 if ((p = strchr(host, '.')))
4080 {
4081 char *domain = 0;
4082 char _domain[1024];
4083
4084 // strip off domain
4085 FILE *resolv = fopen("/etc/resolv.conf", "r");
4086 if (resolv)
4087 {
4088 char buf[1024];
4089 char *b;
4090
4091 while (fgets(buf, sizeof(buf), resolv))
4092 {
4093 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4094 continue;
4095
4096 if (!isspace(buf[6]))
4097 continue;
4098
4099 b = buf + 7;
4100 while (isspace(*b)) b++;
4101
4102 if (*b)
4103 {
4104 char *d = b;
4105 while (*b && !isspace(*b)) b++;
4106 *b = 0;
4107 if (buf[0] == 'd') // domain is canonical
4108 {
4109 domain = d;
4110 break;
4111 }
4112
4113 // first search line
4114 if (!domain)
4115 {
4116 // hold, may be subsequent domain line
4117 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4118 domain = _domain;
4119 }
4120 }
4121 }
4122
4123 fclose(resolv);
4124 }
4125
4126 if (domain)
4127 {
4128 int hl = strlen(host);
4129 int dl = strlen(domain);
4130 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4131 host[hl -dl - 1] = 0;
4132 }
4133 else
4134 {
4135 *p = 0; // everything after first dot
4136 }
4137 }
4138 }
4139
4140 // Init data structures
4141 static void initdata(int optdebug, char *optconfig)
4142 {
4143 int i;
4144
4145 if (!(config = shared_malloc(sizeof(configt))))
4146 {
4147 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4148 exit(1);
4149 }
4150
4151 memset(config, 0, sizeof(configt));
4152 time(&config->start_time);
4153 strncpy(config->config_file, optconfig, strlen(optconfig));
4154 config->debug = optdebug;
4155 config->num_tbfs = MAXTBFS;
4156 config->rl_rate = 28; // 28kbps
4157 config->cluster_mcast_ttl = 1;
4158 config->cluster_master_min_adv = 1;
4159 config->ppp_restart_time = 3;
4160 config->ppp_max_configure = 10;
4161 config->ppp_max_failure = 5;
4162 config->kill_timedout_sessions = 1;
4163 strcpy(config->random_device, RANDOMDEVICE);
4164
4165 log_stream = stderr;
4166
4167 #ifdef RINGBUFFER
4168 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4169 {
4170 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4171 exit(1);
4172 }
4173 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4174 #endif
4175
4176 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4177 {
4178 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4179 exit(1);
4180 }
4181 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4182 {
4183 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4184 exit(1);
4185 }
4186 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4187 {
4188 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4189 exit(1);
4190 }
4191 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4192 {
4193 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4194 exit(1);
4195 }
4196 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4197 {
4198 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4199 exit(1);
4200 }
4201
4202 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4203 {
4204 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4205 exit(1);
4206 }
4207
4208 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4209 {
4210 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4211 exit(1);
4212 }
4213
4214 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4215 {
4216 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4217 exit(1);
4218 }
4219
4220 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4221 {
4222 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4223 exit(1);
4224 }
4225 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4226
4227 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4228 {
4229 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4230 exit(1);
4231 }
4232 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4233
4234 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4235 {
4236 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4237 exit(1);
4238 }
4239 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4240
4241 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4242 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4243 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4244 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4245 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4246
4247 // Put all the sessions on the free list marked as undefined.
4248 for (i = 1; i < MAXSESSION; i++)
4249 {
4250 session[i].next = i + 1;
4251 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4252 }
4253 session[MAXSESSION - 1].next = 0;
4254 sessionfree = 1;
4255
4256 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4257 for (i = 1; i < MAXTUNNEL; i++)
4258 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4259
4260 for (i = 1; i < MAXBUNDLE; i++) {
4261 bundle[i].state = BUNDLEUNDEF;
4262 }
4263
4264 if (!*hostname)
4265 {
4266 // Grab my hostname unless it's been specified
4267 gethostname(hostname, sizeof(hostname));
4268 stripdomain(hostname);
4269 }
4270
4271 _statistics->start_time = _statistics->last_reset = time(NULL);
4272
4273 #ifdef BGP
4274 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4275 {
4276 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4277 exit(1);
4278 }
4279 #endif /* BGP */
4280 }
4281
4282 static int assign_ip_address(sessionidt s)
4283 {
4284 uint32_t i;
4285 int best = -1;
4286 time_t best_time = time_now;
4287 char *u = session[s].user;
4288 char reuse = 0;
4289
4290
4291 CSTAT(assign_ip_address);
4292
4293 for (i = 1; i < ip_pool_size; i++)
4294 {
4295 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4296 continue;
4297
4298 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4299 {
4300 best = i;
4301 reuse = 1;
4302 break;
4303 }
4304
4305 if (ip_address_pool[i].last < best_time)
4306 {
4307 best = i;
4308 if (!(best_time = ip_address_pool[i].last))
4309 break; // never used, grab this one
4310 }
4311 }
4312
4313 if (best < 0)
4314 {
4315 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4316 return 0;
4317 }
4318
4319 session[s].ip = ip_address_pool[best].address;
4320 session[s].ip_pool_index = best;
4321 ip_address_pool[best].assigned = 1;
4322 ip_address_pool[best].last = time_now;
4323 ip_address_pool[best].session = s;
4324 if (session[s].walled_garden)
4325 /* Don't track addresses of users in walled garden (note: this
4326 means that their address isn't "sticky" even if they get
4327 un-gardened). */
4328 ip_address_pool[best].user[0] = 0;
4329 else
4330 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4331
4332 STAT(ip_allocated);
4333 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4334 reuse ? "Reusing" : "Allocating", best);
4335
4336 return 1;
4337 }
4338
4339 static void free_ip_address(sessionidt s)
4340 {
4341 int i = session[s].ip_pool_index;
4342
4343
4344 CSTAT(free_ip_address);
4345
4346 if (!session[s].ip)
4347 return; // what the?
4348
4349 if (i < 0) // Is this actually part of the ip pool?
4350 i = 0;
4351
4352 STAT(ip_freed);
4353 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4354 session[s].ip = 0;
4355 ip_address_pool[i].assigned = 0;
4356 ip_address_pool[i].session = 0;
4357 ip_address_pool[i].last = time_now;
4358 }
4359
4360 //
4361 // Fsck the address pool against the session table.
4362 // Normally only called when we become a master.
4363 //
4364 // This isn't perfect: We aren't keep tracking of which
4365 // users used to have an IP address.
4366 //
4367 void rebuild_address_pool(void)
4368 {
4369 int i;
4370
4371 //
4372 // Zero the IP pool allocation, and build
4373 // a map from IP address to pool index.
4374 for (i = 1; i < MAXIPPOOL; ++i)
4375 {
4376 ip_address_pool[i].assigned = 0;
4377 ip_address_pool[i].session = 0;
4378 if (!ip_address_pool[i].address)
4379 continue;
4380
4381 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4382 }
4383
4384 for (i = 0; i < MAXSESSION; ++i)
4385 {
4386 int ipid;
4387 if (!(session[i].opened && session[i].ip))
4388 continue;
4389
4390 ipid = - lookup_ipmap(htonl(session[i].ip));
4391
4392 if (session[i].ip_pool_index < 0)
4393 {
4394 // Not allocated out of the pool.
4395 if (ipid < 1) // Not found in the pool either? good.
4396 continue;
4397
4398 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4399 i, fmtaddr(session[i].ip, 0), ipid);
4400
4401 // Fall through and process it as part of the pool.
4402 }
4403
4404
4405 if (ipid > MAXIPPOOL || ipid < 0)
4406 {
4407 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4408 ipid = -1;
4409 session[i].ip_pool_index = ipid;
4410 continue;
4411 }
4412
4413 ip_address_pool[ipid].assigned = 1;
4414 ip_address_pool[ipid].session = i;
4415 ip_address_pool[ipid].last = time_now;
4416 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4417 session[i].ip_pool_index = ipid;
4418 cache_ipmap(session[i].ip, i); // Fix the ip map.
4419 }
4420 }
4421
4422 //
4423 // Fix the address pool to match a changed session.
4424 // (usually when the master sends us an update).
4425 static void fix_address_pool(int sid)
4426 {
4427 int ipid;
4428
4429 ipid = session[sid].ip_pool_index;
4430
4431 if (ipid > ip_pool_size)
4432 return; // Ignore it. rebuild_address_pool will fix it up.
4433
4434 if (ip_address_pool[ipid].address != session[sid].ip)
4435 return; // Just ignore it. rebuild_address_pool will take care of it.
4436
4437 ip_address_pool[ipid].assigned = 1;
4438 ip_address_pool[ipid].session = sid;
4439 ip_address_pool[ipid].last = time_now;
4440 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4441 }
4442
4443 //
4444 // Add a block of addresses to the IP pool to hand out.
4445 //
4446 static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
4447 {
4448 int i;
4449 if (mask == 0)
4450 mask = 0xffffffff; // Host route only.
4451
4452 addr &= mask;
4453
4454 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4455 return ;
4456
4457 for (i = addr ;(i & mask) == addr; ++i)
4458 {
4459 if ((i & 0xff) == 0 || (i&0xff) == 255)
4460 continue; // Skip 0 and broadcast addresses.
4461
4462 ip_address_pool[ip_pool_size].address = i;
4463 ip_address_pool[ip_pool_size].assigned = 0;
4464 ++ip_pool_size;
4465 if (ip_pool_size >= MAXIPPOOL)
4466 {
4467 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4468 return;
4469 }
4470 }
4471 }
4472
4473 // Initialize the IP address pool
4474 static void initippool()
4475 {
4476 FILE *f;
4477 char *p;
4478 char buf[4096];
4479 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4480
4481 if (!(f = fopen(IPPOOLFILE, "r")))
4482 {
4483 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4484 exit(1);
4485 }
4486
4487 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4488 {
4489 char *pool = buf;
4490 buf[4095] = 0; // Force it to be zero terminated/
4491
4492 if (*buf == '#' || *buf == '\n')
4493 continue; // Skip comments / blank lines
4494 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4495 if ((p = (char *)strchr(buf, ':')))
4496 {
4497 in_addr_t src;
4498 *p = '\0';
4499 src = inet_addr(buf);
4500 if (src == INADDR_NONE)
4501 {
4502 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4503 exit(1);
4504 }
4505 // This entry is for a specific IP only
4506 if (src != config->bind_address)
4507 continue;
4508 *p = ':';
4509 pool = p+1;
4510 }
4511 if ((p = (char *)strchr(pool, '/')))
4512 {
4513 // It's a range
4514 int numbits = 0;
4515 in_addr_t start = 0, mask = 0;
4516
4517 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4518 *p++ = 0;
4519 if (!*p || !(numbits = atoi(p)))
4520 {
4521 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4522 continue;
4523 }
4524 start = ntohl(inet_addr(pool));
4525 mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
4526
4527 // Add a static route for this pool
4528 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
4529 fmtaddr(htonl(start), 0), 32 + mask);
4530
4531 routeset(0, start, mask, 0, 1);
4532
4533 add_to_ip_pool(start, mask);
4534 }
4535 else
4536 {
4537 // It's a single ip address
4538 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4539 }
4540 }
4541 fclose(f);
4542 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4543 }
4544
4545 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4546 {
4547 struct sockaddr_in snoop_addr = {0};
4548 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4549 return;
4550
4551 snoop_addr.sin_family = AF_INET;
4552 snoop_addr.sin_addr.s_addr = destination;
4553 snoop_addr.sin_port = ntohs(port);
4554
4555 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4556 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4557 htons(snoop_addr.sin_port));
4558
4559 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4560 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4561
4562 STAT(packets_snooped);
4563 }
4564
4565 static int dump_session(FILE **f, sessiont *s)
4566 {
4567 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4568 return 1;
4569
4570 if (!*f)
4571 {
4572 char filename[1024];
4573 char timestr[64];
4574 time_t now = time(NULL);
4575
4576 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4577 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4578
4579 if (!(*f = fopen(filename, "w")))
4580 {
4581 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4582 return 0;
4583 }
4584
4585 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4586 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4587 "# host: %s\n"
4588 "# endpoint: %s\n"
4589 "# time: %ld\n"
4590 "# uptime: %ld\n"
4591 "# format: username ip qos uptxoctets downrxoctets\n",
4592 hostname,
4593 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4594 now,
4595 now - basetime);
4596 }
4597
4598 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4599 fprintf(*f, "%s %s %d %u %u\n",
4600 s->user, // username
4601 fmtaddr(htonl(s->ip), 0), // ip
4602 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4603 (uint32_t) s->cin_delta, // uptxoctets
4604 (uint32_t) s->cout_delta); // downrxoctets
4605
4606 s->cin_delta = s->cout_delta = 0;
4607
4608 return 1;
4609 }
4610
4611 static void dump_acct_info(int all)
4612 {
4613 int i;
4614 FILE *f = NULL;
4615
4616
4617 CSTAT(dump_acct_info);
4618
4619 if (shut_acct_n)
4620 {
4621 for (i = 0; i < shut_acct_n; i++)
4622 dump_session(&f, &shut_acct[i]);
4623
4624 shut_acct_n = 0;
4625 }
4626
4627 if (all)
4628 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4629 dump_session(&f, &session[i]);
4630
4631 if (f)
4632 fclose(f);
4633 }
4634
4635 // Main program
4636 int main(int argc, char *argv[])
4637 {
4638 int i;
4639 int optdebug = 0;
4640 char *optconfig = CONFIGFILE;
4641
4642 time(&basetime); // start clock
4643
4644 // scan args
4645 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4646 {
4647 switch (i)
4648 {
4649 case 'd':
4650 if (fork()) exit(0);
4651 setsid();
4652 freopen("/dev/null", "r", stdin);
4653 freopen("/dev/null", "w", stdout);
4654 freopen("/dev/null", "w", stderr);
4655 break;
4656 case 'v':
4657 optdebug++;
4658 break;
4659 case 'c':
4660 optconfig = optarg;
4661 break;
4662 case 'h':
4663 snprintf(hostname, sizeof(hostname), "%s", optarg);
4664 break;
4665 default:
4666 printf("Args are:\n"
4667 "\t-d\t\tDetach from terminal\n"
4668 "\t-c <file>\tConfig file\n"
4669 "\t-h <hostname>\tForce hostname\n"
4670 "\t-v\t\tDebug\n");
4671
4672 return (0);
4673 break;
4674 }
4675 }
4676
4677 // Start the timer routine off
4678 time(&time_now);
4679 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4680
4681 initplugins();
4682 initdata(optdebug, optconfig);
4683
4684 init_cli(hostname);
4685 read_config_file();
4686 update_config();
4687 init_tbf(config->num_tbfs);
4688
4689 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4690 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4691 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4692 {
4693 struct rlimit rlim;
4694 rlim.rlim_cur = RLIM_INFINITY;
4695 rlim.rlim_max = RLIM_INFINITY;
4696 // Remove the maximum core size
4697 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4698 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4699
4700 // Make core dumps go to /tmp
4701 chdir("/tmp");
4702 }
4703
4704 if (config->scheduler_fifo)
4705 {
4706 int ret;
4707 struct sched_param params = {0};
4708 params.sched_priority = 1;
4709
4710 if (get_nprocs() < 2)
4711 {
4712 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4713 config->scheduler_fifo = 0;
4714 }
4715 else
4716 {
4717 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4718 {
4719 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4720 }
4721 else
4722 {
4723 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4724 config->scheduler_fifo = 0;
4725 }
4726 }
4727 }
4728
4729 initnetlink();
4730
4731 /* Set up the cluster communications port. */
4732 if (cluster_init() < 0)
4733 exit(1);
4734
4735 inittun();
4736 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4737
4738 initudp();
4739 initrad();
4740 initippool();
4741
4742 // seed prng
4743 {
4744 unsigned seed = time_now ^ getpid();
4745 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4746 srand(seed);
4747 }
4748
4749 signal(SIGHUP, sighup_handler);
4750 signal(SIGCHLD, sigchild_handler);
4751 signal(SIGTERM, shutdown_handler);
4752 signal(SIGINT, shutdown_handler);
4753 signal(SIGQUIT, shutdown_handler);
4754
4755 // Prevent us from getting paged out
4756 if (config->lock_pages)
4757 {
4758 if (!mlockall(MCL_CURRENT))
4759 LOG(1, 0, 0, "Locking pages into memory\n");
4760 else
4761 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4762 }
4763
4764 mainloop();
4765
4766 /* remove plugins (so cleanup code gets run) */
4767 plugins_done();
4768
4769 // Remove the PID file if we wrote it
4770 if (config->wrote_pid && *config->pid_file == '/')
4771 unlink(config->pid_file);
4772
4773 /* kill CLI children */
4774 signal(SIGTERM, SIG_IGN);
4775 kill(0, SIGTERM);
4776 return 0;
4777 }
4778
4779 static void sighup_handler(int sig)
4780 {
4781 main_reload++;
4782 }
4783
4784 static void shutdown_handler(int sig)
4785 {
4786 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4787 }
4788
4789 static void sigchild_handler(int sig)
4790 {
4791 while (waitpid(-1, NULL, WNOHANG) > 0)
4792 ;
4793 }
4794
4795 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4796 {
4797 MD5_CTX ctx;
4798 *challenge_response = NULL;
4799
4800 if (!*config->l2tp_secret)
4801 {
4802 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4803 return;
4804 }
4805
4806 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4807
4808 *challenge_response = calloc(17, 1);
4809
4810 MD5_Init(&ctx);
4811 MD5_Update(&ctx, &id, 1);
4812 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4813 MD5_Update(&ctx, challenge, challenge_length);
4814 MD5_Final(*challenge_response, &ctx);
4815
4816 return;
4817 }
4818
4819 static int facility_value(char *name)
4820 {
4821 int i;
4822 for (i = 0; facilitynames[i].c_name; i++)
4823 {
4824 if (strcmp(facilitynames[i].c_name, name) == 0)
4825 return facilitynames[i].c_val;
4826 }
4827 return 0;
4828 }
4829
4830 static void update_config()
4831 {
4832 int i;
4833 char *p;
4834 static int timeout = 0;
4835 static int interval = 0;
4836
4837 // Update logging
4838 closelog();
4839 syslog_log = 0;
4840 if (log_stream)
4841 {
4842 if (log_stream != stderr)
4843 fclose(log_stream);
4844
4845 log_stream = NULL;
4846 }
4847
4848 if (*config->log_filename)
4849 {
4850 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4851 {
4852 char *p = config->log_filename + 7;
4853 if (*p)
4854 {
4855 openlog("l2tpns", LOG_PID, facility_value(p));
4856 syslog_log = 1;
4857 }
4858 }
4859 else if (strchr(config->log_filename, '/') == config->log_filename)
4860 {
4861 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4862 {
4863 fseek(log_stream, 0, SEEK_END);
4864 setbuf(log_stream, NULL);
4865 }
4866 else
4867 {
4868 log_stream = stderr;
4869 setbuf(log_stream, NULL);
4870 }
4871 }
4872 }
4873 else
4874 {
4875 log_stream = stderr;
4876 setbuf(log_stream, NULL);
4877 }
4878
4879 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4880 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4881
4882 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4883 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4884 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4885
4886 // reset MRU/MSS globals
4887 MRU = config->l2tp_mtu - L2TP_HDRS;
4888 if (MRU > PPPoE_MRU)
4889 MRU = PPPoE_MRU;
4890
4891 MSS = MRU - TCP_HDRS;
4892
4893 // Update radius
4894 config->numradiusservers = 0;
4895 for (i = 0; i < MAXRADSERVER; i++)
4896 if (config->radiusserver[i])
4897 {
4898 config->numradiusservers++;
4899 // Set radius port: if not set, take the port from the
4900 // first radius server. For the first radius server,
4901 // take the #defined default value from l2tpns.h
4902
4903 // test twice, In case someone works with
4904 // a secondary radius server without defining
4905 // a primary one, this will work even then.
4906 if (i > 0 && !config->radiusport[i])
4907 config->radiusport[i] = config->radiusport[i-1];
4908 if (!config->radiusport[i])
4909 config->radiusport[i] = RADPORT;
4910 }
4911
4912 if (!config->numradiusservers)
4913 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4914
4915 // parse radius_authtypes_s
4916 config->radius_authtypes = config->radius_authprefer = 0;
4917 p = config->radius_authtypes_s;
4918 while (p && *p)
4919 {
4920 char *s = strpbrk(p, " \t,");
4921 int type = 0;
4922
4923 if (s)
4924 {
4925 *s++ = 0;
4926 while (*s == ' ' || *s == '\t')
4927 s++;
4928
4929 if (!*s)
4930 s = 0;
4931 }
4932
4933 if (!strncasecmp("chap", p, strlen(p)))
4934 type = AUTHCHAP;
4935 else if (!strncasecmp("pap", p, strlen(p)))
4936 type = AUTHPAP;
4937 else
4938 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4939
4940 config->radius_authtypes |= type;
4941 if (!config->radius_authprefer)
4942 config->radius_authprefer = type;
4943
4944 p = s;
4945 }
4946
4947 if (!config->radius_authtypes)
4948 {
4949 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4950 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4951 }
4952
4953 // normalise radius_authtypes_s
4954 if (config->radius_authprefer == AUTHPAP)
4955 {
4956 strcpy(config->radius_authtypes_s, "pap");
4957 if (config->radius_authtypes & AUTHCHAP)
4958 strcat(config->radius_authtypes_s, ", chap");
4959 }
4960 else
4961 {
4962 strcpy(config->radius_authtypes_s, "chap");
4963 if (config->radius_authtypes & AUTHPAP)
4964 strcat(config->radius_authtypes_s, ", pap");
4965 }
4966
4967 if (!config->radius_dae_port)
4968 config->radius_dae_port = DAEPORT;
4969
4970 // re-initialise the random number source
4971 initrandom(config->random_device);
4972
4973 // Update plugins
4974 for (i = 0; i < MAXPLUGINS; i++)
4975 {
4976 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4977 continue;
4978
4979 if (*config->plugins[i])
4980 {
4981 // Plugin added
4982 add_plugin(config->plugins[i]);
4983 }
4984 else if (*config->old_plugins[i])
4985 {
4986 // Plugin removed
4987 remove_plugin(config->old_plugins[i]);
4988 }
4989 }
4990
4991 // Guest change
4992 guest_accounts_num = 0;
4993 char *p2 = config->guest_user;
4994 while (p2 && *p2)
4995 {
4996 char *s = strpbrk(p2, " \t,");
4997 if (s)
4998 {
4999 *s++ = 0;
5000 while (*s == ' ' || *s == '\t')
5001 s++;
5002
5003 if (!*s)
5004 s = 0;
5005 }
5006
5007 strcpy(guest_users[guest_accounts_num], p2);
5008 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5009 guest_accounts_num++;
5010 p2 = s;
5011 }
5012 // Rebuild the guest_user array
5013 strcpy(config->guest_user, "");
5014 int ui = 0;
5015 for (ui=0; ui<guest_accounts_num; ui++)
5016 {
5017 strcat(config->guest_user, guest_users[ui]);
5018 if (ui<guest_accounts_num-1)
5019 {
5020 strcat(config->guest_user, ",");
5021 }
5022 }
5023
5024
5025 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5026 if (!config->multi_read_count) config->multi_read_count = 10;
5027 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5028 if (!*config->cluster_interface)
5029 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5030
5031 if (!config->cluster_hb_interval)
5032 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5033
5034 if (!config->cluster_hb_timeout)
5035 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5036
5037 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5038 {
5039 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5040 // late, ensure we're sufficiently larger than that
5041 int t = 4 * config->cluster_hb_interval + 11;
5042
5043 if (config->cluster_hb_timeout < t)
5044 {
5045 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5046 config->cluster_hb_timeout = t;
5047 }
5048
5049 // Push timing changes to the slaves immediately if we're the master
5050 if (config->cluster_iam_master)
5051 cluster_heartbeat();
5052
5053 interval = config->cluster_hb_interval;
5054 timeout = config->cluster_hb_timeout;
5055 }
5056
5057 // Write PID file
5058 if (*config->pid_file == '/' && !config->wrote_pid)
5059 {
5060 FILE *f;
5061 if ((f = fopen(config->pid_file, "w")))
5062 {
5063 fprintf(f, "%d\n", getpid());
5064 fclose(f);
5065 config->wrote_pid = 1;
5066 }
5067 else
5068 {
5069 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5070 }
5071 }
5072 }
5073
5074 static void read_config_file()
5075 {
5076 FILE *f;
5077
5078 if (!config->config_file) return;
5079 if (!(f = fopen(config->config_file, "r")))
5080 {
5081 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5082 return;
5083 }
5084
5085 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5086 cli_do_file(f);
5087 LOG(3, 0, 0, "Done reading config file\n");
5088 fclose(f);
5089 }
5090
5091 int sessionsetup(sessionidt s, tunnelidt t)
5092 {
5093 // A session now exists, set it up
5094 in_addr_t ip;
5095 char *user;
5096 sessionidt i;
5097 int r;
5098
5099 CSTAT(sessionsetup);
5100
5101 LOG(3, s, t, "Doing session setup for session\n");
5102
5103 // Join a bundle if the MRRU option is accepted
5104 if(session[s].mrru > 0 && session[s].bundle == 0)
5105 {
5106 LOG(3, s, t, "This session can be part of multilink bundle\n");
5107 if (join_bundle(s) > 0)
5108 cluster_send_bundle(session[s].bundle);
5109 else
5110 {
5111 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5112 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5113 return 0;
5114 }
5115 }
5116
5117 if (!session[s].ip)
5118 {
5119 assign_ip_address(s);
5120 if (!session[s].ip)
5121 {
5122 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5123 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5124 return 0;
5125 }
5126 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5127 fmtaddr(htonl(session[s].ip), 0));
5128 }
5129
5130
5131 // Make sure this is right
5132 session[s].tunnel = t;
5133
5134 // zap old sessions with same IP and/or username
5135 // Don't kill gardened sessions - doing so leads to a DoS
5136 // from someone who doesn't need to know the password
5137 {
5138 ip = session[s].ip;
5139 user = session[s].user;
5140 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5141 {
5142 if (i == s) continue;
5143 if (!session[s].opened) continue;
5144 // Allow duplicate sessions for multilink ones of the same bundle.
5145 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
5146 continue;
5147 if (ip == session[i].ip)
5148 {
5149 sessionkill(i, "Duplicate IP address");
5150 continue;
5151 }
5152
5153 if (config->allow_duplicate_users) continue;
5154 if (session[s].walled_garden || session[i].walled_garden) continue;
5155 // Guest change
5156 int found = 0;
5157 int gu;
5158 for (gu = 0; gu < guest_accounts_num; gu++)
5159 {
5160 if (!strcasecmp(user, guest_users[gu]))
5161 {
5162 found = 1;
5163 break;
5164 }
5165 }
5166 if (found) continue;
5167
5168 // Drop the new session in case of duplicate sessionss, not the old one.
5169 if (!strcasecmp(user, session[i].user))
5170 sessionkill(i, "Duplicate session for users");
5171 }
5172 }
5173
5174 // no need to set a route for the same IP address of the bundle
5175 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5176 {
5177 int routed = 0;
5178
5179 // Add the route for this session.
5180 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5181 {
5182 if ((session[s].ip & session[s].route[r].mask) ==
5183 (session[s].route[r].ip & session[s].route[r].mask))
5184 routed++;
5185
5186 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
5187 }
5188
5189 // Static IPs need to be routed if not already
5190 // convered by a Framed-Route. Anything else is part
5191 // of the IP address pool and is already routed, it
5192 // just needs to be added to the IP cache.
5193 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5194 if (session[s].ip_pool_index == -1) // static ip
5195 {
5196 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5197 }
5198 else
5199 cache_ipmap(session[s].ip, s);
5200 }
5201
5202 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5203 lcp_open(s, t); // transition to Network phase and send initial IPCP
5204
5205 // Run the plugin's against this new session.
5206 {
5207 struct param_new_session data = { &tunnel[t], &session[s] };
5208 run_plugins(PLUGIN_NEW_SESSION, &data);
5209 }
5210
5211 // Allocate TBFs if throttled
5212 if (session[s].throttle_in || session[s].throttle_out)
5213 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5214
5215 session[s].last_packet = session[s].last_data = time_now;
5216
5217 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5218 fmtaddr(htonl(session[s].ip), 0),
5219 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5220
5221 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5222
5223 return 1; // RADIUS OK and IP allocated, done...
5224 }
5225
5226 //
5227 // This session just got dropped on us by the master or something.
5228 // Make sure our tables up up to date...
5229 //
5230 int load_session(sessionidt s, sessiont *new)
5231 {
5232 int i;
5233 int newip = 0;
5234
5235 // Sanity checks.
5236 if (new->ip_pool_index >= MAXIPPOOL ||
5237 new->tunnel >= MAXTUNNEL)
5238 {
5239 LOG(0, s, 0, "Strange session update received!\n");
5240 // FIXME! What to do here?
5241 return 0;
5242 }
5243
5244 //
5245 // Ok. All sanity checks passed. Now we're committed to
5246 // loading the new session.
5247 //
5248
5249 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5250
5251 // See if routes/ip cache need updating
5252 if (new->ip != session[s].ip)
5253 newip++;
5254
5255 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5256 if (new->route[i].ip != session[s].route[i].ip ||
5257 new->route[i].mask != session[s].route[i].mask)
5258 newip++;
5259
5260 // needs update
5261 if (newip)
5262 {
5263 int routed = 0;
5264
5265 // remove old routes...
5266 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5267 {
5268 if ((session[s].ip & session[s].route[i].mask) ==
5269 (session[s].route[i].ip & session[s].route[i].mask))
5270 routed++;
5271
5272 routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
5273 }
5274
5275 // ...ip
5276 if (session[s].ip)
5277 {
5278 if (session[s].ip_pool_index == -1) // static IP
5279 {
5280 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5281 }
5282 else // It's part of the IP pool, remove it manually.
5283 uncache_ipmap(session[s].ip);
5284 }
5285
5286 routed = 0;
5287
5288 // add new routes...
5289 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5290 {
5291 if ((new->ip & new->route[i].mask) ==
5292 (new->route[i].ip & new->route[i].mask))
5293 routed++;
5294
5295 routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
5296 }
5297
5298 // ...ip
5299 if (new->ip)
5300 {
5301 // If there's a new one, add it.
5302 if (new->ip_pool_index == -1)
5303 {
5304 if (!routed) routeset(s, new->ip, 0, 0, 1);
5305 }
5306 else
5307 cache_ipmap(new->ip, s);
5308 }
5309 }
5310
5311 // check v6 routing
5312 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5313 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5314
5315 // check filters
5316 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5317 {
5318 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5319 new->filter_in = 0;
5320 }
5321
5322 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5323 {
5324 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5325 new->filter_out = 0;
5326 }
5327
5328 if (new->filter_in != session[s].filter_in)
5329 {
5330 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5331 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5332 }
5333
5334 if (new->filter_out != session[s].filter_out)
5335 {
5336 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5337 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5338 }
5339
5340 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5341 // for walking the sessions to forward byte counts to the master.
5342 config->cluster_highest_sessionid = s;
5343
5344 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5345
5346 // Do fixups into address pool.
5347 if (new->ip_pool_index != -1)
5348 fix_address_pool(s);
5349
5350 return 1;
5351 }
5352
5353 static void initplugins()
5354 {
5355 int i;
5356
5357 loaded_plugins = ll_init();
5358 // Initialize the plugins to nothing
5359 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5360 plugins[i] = ll_init();
5361 }
5362
5363 static void *open_plugin(char *plugin_name, int load)
5364 {
5365 char path[256] = "";
5366
5367 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5368 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5369 return dlopen(path, RTLD_NOW);
5370 }
5371
5372 // plugin callback to get a config value
5373 static void *getconfig(char *key, enum config_typet type)
5374 {
5375 int i;
5376
5377 for (i = 0; config_values[i].key; i++)
5378 {
5379 if (!strcmp(config_values[i].key, key))
5380 {
5381 if (config_values[i].type == type)
5382 return ((void *) config) + config_values[i].offset;
5383
5384 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5385 key, type, config_values[i].type);
5386
5387 return 0;
5388 }
5389 }
5390
5391 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5392 return 0;
5393 }
5394
5395 static int add_plugin(char *plugin_name)
5396 {
5397 static struct pluginfuncs funcs = {
5398 _log,
5399 _log_hex,
5400 fmtaddr,
5401 sessionbyuser,
5402 sessiontbysessionidt,
5403 sessionidtbysessiont,
5404 radiusnew,
5405 radiussend,
5406 getconfig,
5407 sessionshutdown,
5408 sessionkill,
5409 throttle_session,
5410 cluster_send_session,
5411 };
5412
5413 void *p = open_plugin(plugin_name, 1);
5414 int (*initfunc)(struct pluginfuncs *);
5415 int i;
5416
5417 if (!p)
5418 {
5419 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5420 return -1;
5421 }
5422
5423 if (ll_contains(loaded_plugins, p))
5424 {
5425 dlclose(p);
5426 return 0; // already loaded
5427 }
5428
5429 {
5430 int *v = dlsym(p, "plugin_api_version");
5431 if (!v || *v != PLUGIN_API_VERSION)
5432 {
5433 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5434 dlclose(p);
5435 return -1;
5436 }
5437 }
5438
5439 if ((initfunc = dlsym(p, "plugin_init")))
5440 {
5441 if (!initfunc(&funcs))
5442 {
5443 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5444 dlclose(p);
5445 return -1;
5446 }
5447 }
5448
5449 ll_push(loaded_plugins, p);
5450
5451 for (i = 0; i < max_plugin_functions; i++)
5452 {
5453 void *x;
5454 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5455 {
5456 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5457 ll_push(plugins[i], x);
5458 }
5459 }
5460
5461 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5462 return 1;
5463 }
5464
5465 static void run_plugin_done(void *plugin)
5466 {
5467 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5468
5469 if (donefunc)
5470 donefunc();
5471 }
5472
5473 static int remove_plugin(char *plugin_name)
5474 {
5475 void *p = open_plugin(plugin_name, 0);
5476 int loaded = 0;
5477
5478 if (!p)
5479 return -1;
5480
5481 if (ll_contains(loaded_plugins, p))
5482 {
5483 int i;
5484 for (i = 0; i < max_plugin_functions; i++)
5485 {
5486 void *x;
5487 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5488 ll_delete(plugins[i], x);
5489 }
5490
5491 ll_delete(loaded_plugins, p);
5492 run_plugin_done(p);
5493 loaded = 1;
5494 }
5495
5496 dlclose(p);
5497 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5498 return loaded;
5499 }
5500
5501 int run_plugins(int plugin_type, void *data)
5502 {
5503 int (*func)(void *data);
5504
5505 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5506 return PLUGIN_RET_ERROR;
5507
5508 ll_reset(plugins[plugin_type]);
5509 while ((func = ll_next(plugins[plugin_type])))
5510 {
5511 int r = func(data);
5512
5513 if (r != PLUGIN_RET_OK)
5514 return r; // stop here
5515 }
5516
5517 return PLUGIN_RET_OK;
5518 }
5519
5520 static void plugins_done()
5521 {
5522 void *p;
5523
5524 ll_reset(loaded_plugins);
5525 while ((p = ll_next(loaded_plugins)))
5526 run_plugin_done(p);
5527 }
5528
5529 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5530 {
5531 struct nsctl request;
5532 struct nsctl response;
5533 int type = unpack_control(&request, buf, len);
5534 int r;
5535 void *p;
5536
5537 if (log_stream && config->debug >= 4)
5538 {
5539 if (type < 0)
5540 {
5541 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5542 fmtaddr(addr->sin_addr.s_addr, 0), type);
5543 }
5544 else
5545 {
5546 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5547 dump_control(&request, log_stream);
5548 }
5549 }
5550
5551 switch (type)
5552 {
5553 case NSCTL_REQ_LOAD:
5554 if (request.argc != 1)
5555 {
5556 response.type = NSCTL_RES_ERR;
5557 response.argc = 1;
5558 response.argv[0] = "name of plugin required";
5559 }
5560 else if ((r = add_plugin(request.argv[0])) < 1)
5561 {
5562 response.type = NSCTL_RES_ERR;
5563 response.argc = 1;
5564 response.argv[0] = !r
5565 ? "plugin already loaded"
5566 : "error loading plugin";
5567 }
5568 else
5569 {
5570 response.type = NSCTL_RES_OK;
5571 response.argc = 0;
5572 }
5573
5574 break;
5575
5576 case NSCTL_REQ_UNLOAD:
5577 if (request.argc != 1)
5578 {
5579 response.type = NSCTL_RES_ERR;
5580 response.argc = 1;
5581 response.argv[0] = "name of plugin required";
5582 }
5583 else if ((r = remove_plugin(request.argv[0])) < 1)
5584 {
5585 response.type = NSCTL_RES_ERR;
5586 response.argc = 1;
5587 response.argv[0] = !r
5588 ? "plugin not loaded"
5589 : "plugin not found";
5590 }
5591 else
5592 {
5593 response.type = NSCTL_RES_OK;
5594 response.argc = 0;
5595 }
5596
5597 break;
5598
5599 case NSCTL_REQ_HELP:
5600 response.type = NSCTL_RES_OK;
5601 response.argc = 0;
5602
5603 ll_reset(loaded_plugins);
5604 while ((p = ll_next(loaded_plugins)))
5605 {
5606 char **help = dlsym(p, "plugin_control_help");
5607 while (response.argc < 0xff && help && *help)
5608 response.argv[response.argc++] = *help++;
5609 }
5610
5611 break;
5612
5613 case NSCTL_REQ_CONTROL:
5614 {
5615 struct param_control param = {
5616 config->cluster_iam_master,
5617 request.argc,
5618 request.argv,
5619 0,
5620 NULL,
5621 };
5622
5623 int r = run_plugins(PLUGIN_CONTROL, &param);
5624
5625 if (r == PLUGIN_RET_ERROR)
5626 {
5627 response.type = NSCTL_RES_ERR;
5628 response.argc = 1;
5629 response.argv[0] = param.additional
5630 ? param.additional
5631 : "error returned by plugin";
5632 }
5633 else if (r == PLUGIN_RET_NOTMASTER)
5634 {
5635 static char msg[] = "must be run on master: 000.000.000.000";
5636
5637 response.type = NSCTL_RES_ERR;
5638 response.argc = 1;
5639 if (config->cluster_master_address)
5640 {
5641 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5642 response.argv[0] = msg;
5643 }
5644 else
5645 {
5646 response.argv[0] = "must be run on master: none elected";
5647 }
5648 }
5649 else if (!(param.response & NSCTL_RESPONSE))
5650 {
5651 response.type = NSCTL_RES_ERR;
5652 response.argc = 1;
5653 response.argv[0] = param.response
5654 ? "unrecognised response value from plugin"
5655 : "unhandled action";
5656 }
5657 else
5658 {
5659 response.type = param.response;
5660 response.argc = 0;
5661 if (param.additional)
5662 {
5663 response.argc = 1;
5664 response.argv[0] = param.additional;
5665 }
5666 }
5667 }
5668
5669 break;
5670
5671 default:
5672 response.type = NSCTL_RES_ERR;
5673 response.argc = 1;
5674 response.argv[0] = "error unpacking control packet";
5675 }
5676
5677 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5678 if (!buf)
5679 {
5680 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5681 return;
5682 }
5683
5684 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5685 if (r > 0)
5686 {
5687 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5688 if (log_stream && config->debug >= 4)
5689 {
5690 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5691 dump_control(&response, log_stream);
5692 }
5693 }
5694 else
5695 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5696 fmtaddr(addr->sin_addr.s_addr, 0), r);
5697
5698 free(buf);
5699 }
5700
5701 static tunnelidt new_tunnel()
5702 {
5703 tunnelidt i;
5704 for (i = 1; i < MAXTUNNEL; i++)
5705 {
5706 if (tunnel[i].state == TUNNELFREE)
5707 {
5708 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5709 if (i > config->cluster_highest_tunnelid)
5710 config->cluster_highest_tunnelid = i;
5711 return i;
5712 }
5713 }
5714 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5715 return 0;
5716 }
5717
5718 //
5719 // We're becoming the master. Do any required setup..
5720 //
5721 // This is principally telling all the plugins that we're
5722 // now a master, and telling them about all the sessions
5723 // that are active too..
5724 //
5725 void become_master(void)
5726 {
5727 int s, i;
5728 static struct event_data d[RADIUS_FDS];
5729 struct epoll_event e;
5730
5731 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5732
5733 // running a bunch of iptables commands is slow and can cause
5734 // the master to drop tunnels on takeover--kludge around the
5735 // problem by forking for the moment (note: race)
5736 if (!fork_and_close())
5737 {
5738 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5739 {
5740 if (!session[s].opened) // Not an in-use session.
5741 continue;
5742
5743 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5744 }
5745 exit(0);
5746 }
5747
5748 // add radius fds
5749 e.events = EPOLLIN;
5750 for (i = 0; i < RADIUS_FDS; i++)
5751 {
5752 d[i].type = FD_TYPE_RADIUS;
5753 d[i].index = i;
5754 e.data.ptr = &d[i];
5755
5756 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5757 }
5758 }
5759
5760 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5761 {
5762 int s, i;
5763 int count = 0;
5764 int buckets[64];
5765
5766 if (CLI_HELP_REQUESTED)
5767 return CLI_HELP_NO_ARGS;
5768
5769 time(&time_now);
5770 for (i = 0; i < 64;++i) buckets[i] = 0;
5771
5772 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5773 {
5774 int idle;
5775 if (!session[s].opened)
5776 continue;
5777
5778 idle = time_now - session[s].last_data;
5779 idle /= 5 ; // In multiples of 5 seconds.
5780 if (idle < 0)
5781 idle = 0;
5782 if (idle > 63)
5783 idle = 63;
5784
5785 ++count;
5786 ++buckets[idle];
5787 }
5788
5789 for (i = 0; i < 63; ++i)
5790 {
5791 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5792 }
5793 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5794 cli_print(cli, "%d total sessions open.", count);
5795 return CLI_OK;
5796 }
5797
5798 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5799 {
5800 int s, i;
5801 int count = 0;
5802 int buckets[64];
5803
5804 if (CLI_HELP_REQUESTED)
5805 return CLI_HELP_NO_ARGS;
5806
5807 time(&time_now);
5808 for (i = 0; i < 64;++i) buckets[i] = 0;
5809
5810 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5811 {
5812 int open = 0, d;
5813 if (!session[s].opened)
5814 continue;
5815
5816 d = time_now - session[s].opened;
5817 if (d < 0)
5818 d = 0;
5819 while (d > 1 && open < 32)
5820 {
5821 ++open;
5822 d >>= 1; // half.
5823 }
5824 ++count;
5825 ++buckets[open];
5826 }
5827
5828 s = 1;
5829 for (i = 0; i < 30; ++i)
5830 {
5831 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5832 s <<= 1;
5833 }
5834 cli_print(cli, "%d total sessions open.", count);
5835 return CLI_OK;
5836 }
5837
5838 /* Unhide an avp.
5839 *
5840 * This unencodes the AVP using the L2TP secret and the previously
5841 * stored random vector. It overwrites the hidden data with the
5842 * unhidden AVP subformat.
5843 */
5844 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5845 {
5846 MD5_CTX ctx;
5847 uint8_t digest[16];
5848 uint8_t *last;
5849 size_t d = 0;
5850 uint16_t m = htons(type);
5851
5852 // Compute initial pad
5853 MD5_Init(&ctx);
5854 MD5_Update(&ctx, (unsigned char *) &m, 2);
5855 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5856 MD5_Update(&ctx, vector, vec_len);
5857 MD5_Final(digest, &ctx);
5858
5859 // pointer to last decoded 16 octets
5860 last = value;
5861
5862 while (len > 0)
5863 {
5864 // calculate a new pad based on the last decoded block
5865 if (d >= sizeof(digest))
5866 {
5867 MD5_Init(&ctx);
5868 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5869 MD5_Update(&ctx, last, sizeof(digest));
5870 MD5_Final(digest, &ctx);
5871
5872 d = 0;
5873 last = value;
5874 }
5875
5876 *value++ ^= digest[d++];
5877 len--;
5878 }
5879 }
5880
5881 int find_filter(char const *name, size_t len)
5882 {
5883 int free = -1;
5884 int i;
5885
5886 for (i = 0; i < MAXFILTER; i++)
5887 {
5888 if (!*ip_filters[i].name)
5889 {
5890 if (free < 0)
5891 free = i;
5892
5893 continue;
5894 }
5895
5896 if (strlen(ip_filters[i].name) != len)
5897 continue;
5898
5899 if (!strncmp(ip_filters[i].name, name, len))
5900 return i;
5901 }
5902
5903 return free;
5904 }
5905
5906 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5907 {
5908 switch (p->op)
5909 {
5910 case FILTER_PORT_OP_EQ: return port == p->port;
5911 case FILTER_PORT_OP_NEQ: return port != p->port;
5912 case FILTER_PORT_OP_GT: return port > p->port;
5913 case FILTER_PORT_OP_LT: return port < p->port;
5914 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5915 }
5916
5917 return 0;
5918 }
5919
5920 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5921 {
5922 switch (op)
5923 {
5924 case FILTER_FLAG_OP_ANY:
5925 return (flags & sflags) || (~flags & cflags);
5926
5927 case FILTER_FLAG_OP_ALL:
5928 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5929
5930 case FILTER_FLAG_OP_EST:
5931 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5932 }
5933
5934 return 0;
5935 }
5936
5937 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5938 {
5939 uint16_t frag_offset;
5940 uint8_t proto;
5941 in_addr_t src_ip;
5942 in_addr_t dst_ip;
5943 uint16_t src_port = 0;
5944 uint16_t dst_port = 0;
5945 uint8_t flags = 0;
5946 ip_filter_rulet *rule;
5947
5948 if (len < 20) // up to end of destination address
5949 return 0;
5950
5951 if ((*buf >> 4) != 4) // IPv4
5952 return 0;
5953
5954 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5955 proto = buf[9];
5956 src_ip = *(in_addr_t *) (buf + 12);
5957 dst_ip = *(in_addr_t *) (buf + 16);
5958
5959 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5960 {
5961 int l = (buf[0] & 0xf) * 4; // length of IP header
5962 if (len < l + 4) // ports
5963 return 0;
5964
5965 src_port = ntohs(*(uint16_t *) (buf + l));
5966 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5967 if (proto == IPPROTO_TCP)
5968 {
5969 if (len < l + 14) // flags
5970 return 0;
5971
5972 flags = buf[l + 13] & 0x3f;
5973 }
5974 }
5975
5976 for (rule = ip_filters[filter].rules; rule->action; rule++)
5977 {
5978 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5979 continue;
5980
5981 if (rule->src_wild != INADDR_BROADCAST &&
5982 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5983 continue;
5984
5985 if (rule->dst_wild != INADDR_BROADCAST &&
5986 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
5987 continue;
5988
5989 if (frag_offset)
5990 {
5991 // layer 4 deny rules are skipped
5992 if (rule->action == FILTER_ACTION_DENY &&
5993 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
5994 continue;
5995 }
5996 else
5997 {
5998 if (rule->frag)
5999 continue;
6000
6001 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6002 {
6003 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6004 continue;
6005
6006 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6007 continue;
6008
6009 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6010 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6011 continue;
6012 }
6013 }
6014
6015 // matched
6016 rule->counter++;
6017 return rule->action == FILTER_ACTION_PERMIT;
6018 }
6019
6020 // default deny
6021 return 0;
6022 }