3d536227f2eec00a78dbf1b8ab8f653e04ae0a40
[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 static int syslog_log = 0; // are we logging to syslog
77 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
78 uint32_t last_id = 0; // Unique ID for radius accounting
79 // Guest change
80 char guest_users[10][32]; // Array of guest users
81 int guest_accounts_num = 0; // Number of guest users
82
83 // calculated from config->l2tp_mtu
84 uint16_t MRU = 0; // PPP MRU
85 uint16_t MSS = 0; // TCP MSS
86
87 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
88 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
89
90 union iphash {
91 sessionidt sess;
92 union iphash *idx;
93 } ip_hash[256]; // Mapping from IP address to session structures.
94
95 struct ipv6radix {
96 sessionidt sess;
97 struct ipv6radix *branch;
98 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
99
100 // Traffic counters.
101 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
102 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
103 uint32_t eth_tx = 0;
104
105 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
106 time_t time_now = 0; // Current time in seconds since epoch.
107 static char time_now_string[64] = {0}; // Current time as a string.
108 static int time_changed = 0; // time_now changed
109 char main_quit = 0; // True if we're in the process of exiting.
110 static char main_reload = 0; // Re-load pending
111 linked_list *loaded_plugins;
112 linked_list *plugins[MAX_PLUGIN_TYPES];
113
114 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
115 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
116
117 config_descriptt config_values[] = {
118 CONFIG("debug", debug, INT),
119 CONFIG("log_file", log_filename, STRING),
120 CONFIG("pid_file", pid_file, STRING),
121 CONFIG("random_device", random_device, STRING),
122 CONFIG("l2tp_secret", l2tp_secret, STRING),
123 CONFIG("l2tp_mtu", l2tp_mtu, INT),
124 CONFIG("ppp_restart_time", ppp_restart_time, INT),
125 CONFIG("ppp_max_configure", ppp_max_configure, INT),
126 CONFIG("ppp_max_failure", ppp_max_failure, INT),
127 CONFIG("primary_dns", default_dns1, IPv4),
128 CONFIG("secondary_dns", default_dns2, IPv4),
129 CONFIG("primary_radius", radiusserver[0], IPv4),
130 CONFIG("secondary_radius", radiusserver[1], IPv4),
131 CONFIG("primary_radius_port", radiusport[0], SHORT),
132 CONFIG("secondary_radius_port", radiusport[1], SHORT),
133 CONFIG("radius_accounting", radius_accounting, BOOL),
134 CONFIG("radius_interim", radius_interim, INT),
135 CONFIG("radius_secret", radiussecret, STRING),
136 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
137 CONFIG("radius_dae_port", radius_dae_port, SHORT),
138 CONFIG("radius_bind_min", radius_bind_min, SHORT),
139 CONFIG("radius_bind_max", radius_bind_max, SHORT),
140 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
141 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
142 CONFIG("guest_account", guest_user, STRING),
143 CONFIG("bind_address", bind_address, IPv4),
144 CONFIG("peer_address", peer_address, IPv4),
145 CONFIG("send_garp", send_garp, BOOL),
146 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
147 CONFIG("throttle_buckets", num_tbfs, INT),
148 CONFIG("accounting_dir", accounting_dir, STRING),
149 CONFIG("dump_speed", dump_speed, BOOL),
150 CONFIG("multi_read_count", multi_read_count, INT),
151 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
152 CONFIG("lock_pages", lock_pages, BOOL),
153 CONFIG("icmp_rate", icmp_rate, INT),
154 CONFIG("packet_limit", max_packets, INT),
155 CONFIG("cluster_address", cluster_address, IPv4),
156 CONFIG("cluster_interface", cluster_interface, STRING),
157 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
158 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
159 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
160 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
161 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
162 { NULL, 0, 0, 0 },
163 };
164
165 static char *plugin_functions[] = {
166 NULL,
167 "plugin_pre_auth",
168 "plugin_post_auth",
169 "plugin_packet_rx",
170 "plugin_packet_tx",
171 "plugin_timer",
172 "plugin_new_session",
173 "plugin_kill_session",
174 "plugin_control",
175 "plugin_radius_response",
176 "plugin_radius_reset",
177 "plugin_radius_account",
178 "plugin_become_master",
179 "plugin_new_session_master",
180 };
181
182 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
183
184 // Counters for shutdown sessions
185 static sessiont shut_acct[8192];
186 static sessionidt shut_acct_n = 0;
187
188 tunnelt *tunnel = NULL; // Array of tunnel structures.
189 bundlet *bundle = NULL; // Array of bundle structures.
190 fragmentationt *frag = NULL; // Array of fragmentation structures.
191 sessiont *session = NULL; // Array of session structures.
192 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
193 radiust *radius = NULL; // Array of radius structures.
194 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
195 ip_filtert *ip_filters = NULL; // Array of named filters.
196 static controlt *controlfree = 0;
197 struct Tstats *_statistics = NULL;
198 #ifdef RINGBUFFER
199 struct Tringbuffer *ringbuffer = NULL;
200 #endif
201
202 static void cache_ipmap(in_addr_t ip, sessionidt s);
203 static void uncache_ipmap(in_addr_t ip);
204 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
205 static void free_ip_address(sessionidt s);
206 static void dump_acct_info(int all);
207 static void sighup_handler(int sig);
208 static void shutdown_handler(int sig);
209 static void sigchild_handler(int sig);
210 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
211 static void update_config(void);
212 static void read_config_file(void);
213 static void initplugins(void);
214 static int add_plugin(char *plugin_name);
215 static int remove_plugin(char *plugin_name);
216 static void plugins_done(void);
217 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
218 static tunnelidt new_tunnel(void);
219 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
220 static void bundleclear(bundleidt b);
221
222 // on slaves, alow BGP to withdraw cleanly before exiting
223 #define QUIT_DELAY 5
224
225 // quit actions (master)
226 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
227 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
228
229 // return internal time (10ths since process startup), set f if given
230 // as a side-effect sets time_now, and time_changed
231 static clockt now(double *f)
232 {
233 struct timeval t;
234 gettimeofday(&t, 0);
235 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
236 if (t.tv_sec != time_now)
237 {
238 time_now = t.tv_sec;
239 time_changed++;
240 }
241 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
242 }
243
244 // work out a retry time based on try number
245 // This is a straight bounded exponential backoff.
246 // Maximum re-try time is 32 seconds. (2^5).
247 clockt backoff(uint8_t try)
248 {
249 if (try > 5) try = 5; // max backoff
250 return now(NULL) + 10 * (1 << try);
251 }
252
253
254 //
255 // Log a debug message. Typically called via the LOG macro
256 //
257 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
258 {
259 static char message[65536] = {0};
260 va_list ap;
261
262 #ifdef RINGBUFFER
263 if (ringbuffer)
264 {
265 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
266 ringbuffer->tail = 0;
267 if (ringbuffer->tail == ringbuffer->head)
268 if (++ringbuffer->head >= RINGBUFFER_SIZE)
269 ringbuffer->head = 0;
270
271 ringbuffer->buffer[ringbuffer->tail].level = level;
272 ringbuffer->buffer[ringbuffer->tail].session = s;
273 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
274 va_start(ap, format);
275 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
276 va_end(ap);
277 }
278 #endif
279
280 if (config->debug < level) return;
281
282 va_start(ap, format);
283 vsnprintf(message, sizeof(message), format, ap);
284
285 if (log_stream)
286 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
287 else if (syslog_log)
288 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
289
290 va_end(ap);
291 }
292
293 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
294 {
295 int i, j;
296 const uint8_t *d = data;
297
298 if (config->debug < level) return;
299
300 // No support for _log_hex to syslog
301 if (log_stream)
302 {
303 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
304 setvbuf(log_stream, NULL, _IOFBF, 16384);
305
306 for (i = 0; i < maxsize; )
307 {
308 fprintf(log_stream, "%4X: ", i);
309 for (j = i; j < maxsize && j < (i + 16); j++)
310 {
311 fprintf(log_stream, "%02X ", d[j]);
312 if (j == i + 7)
313 fputs(": ", log_stream);
314 }
315
316 for (; j < i + 16; j++)
317 {
318 fputs(" ", log_stream);
319 if (j == i + 7)
320 fputs(": ", log_stream);
321 }
322
323 fputs(" ", log_stream);
324 for (j = i; j < maxsize && j < (i + 16); j++)
325 {
326 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
327 fputc(d[j], log_stream);
328 else
329 fputc('.', log_stream);
330
331 if (j == i + 7)
332 fputs(" ", log_stream);
333 }
334
335 i = j;
336 fputs("\n", log_stream);
337 }
338
339 fflush(log_stream);
340 setbuf(log_stream, NULL);
341 }
342 }
343
344 // update a counter, accumulating 2^32 wraps
345 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
346 {
347 uint32_t new = *counter + delta;
348 if (new < *counter)
349 (*wrap)++;
350
351 *counter = new;
352 }
353
354 // initialise the random generator
355 static void initrandom(char *source)
356 {
357 static char path[sizeof(config->random_device)] = "*undefined*";
358
359 // reinitialise only if we are forced to do so or if the config has changed
360 if (source && !strncmp(path, source, sizeof(path)))
361 return;
362
363 // close previous source, if any
364 if (rand_fd >= 0)
365 close(rand_fd);
366
367 rand_fd = -1;
368
369 if (source)
370 {
371 // register changes
372 snprintf(path, sizeof(path), "%s", source);
373
374 if (*path == '/')
375 {
376 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
377 if (rand_fd < 0)
378 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
379 path, strerror(errno));
380 }
381 }
382 }
383
384 // fill buffer with random data
385 void random_data(uint8_t *buf, int len)
386 {
387 int n = 0;
388
389 CSTAT(random_data);
390 if (rand_fd >= 0)
391 {
392 n = read(rand_fd, buf, len);
393 if (n >= len) return;
394 if (n < 0)
395 {
396 if (errno != EAGAIN)
397 {
398 LOG(0, 0, 0, "Error reading from random source: %s\n",
399 strerror(errno));
400
401 // fall back to rand()
402 initrandom(NULL);
403 }
404
405 n = 0;
406 }
407 }
408
409 // append missing data
410 while (n < len)
411 // not using the low order bits from the prng stream
412 buf[n++] = (rand() >> 4) & 0xff;
413 }
414
415 // Add a route
416 //
417 // This adds it to the routing table, advertises it
418 // via BGP if enabled, and stuffs it into the
419 // 'sessionbyip' cache.
420 //
421 // 'ip' and 'mask' must be in _host_ order.
422 //
423 static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
424 {
425 struct rtentry r;
426 int i;
427
428 if (!mask) mask = 0xffffffff;
429
430 ip &= mask; // Force the ip to be the first one in the route.
431
432 memset(&r, 0, sizeof(r));
433 r.rt_dev = config->tundevice;
434 r.rt_dst.sa_family = AF_INET;
435 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
436 r.rt_gateway.sa_family = AF_INET;
437 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
438 r.rt_genmask.sa_family = AF_INET;
439 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
440 r.rt_flags = (RTF_UP | RTF_STATIC);
441 if (gw)
442 r.rt_flags |= RTF_GATEWAY;
443 else if (mask == 0xffffffff)
444 r.rt_flags |= RTF_HOST;
445
446 LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
447 fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
448 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
449
450 if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
451 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
452
453 #ifdef BGP
454 if (add)
455 bgp_add_route(htonl(ip), htonl(mask));
456 else
457 bgp_del_route(htonl(ip), htonl(mask));
458 #endif /* BGP */
459
460 // Add/Remove the IPs to the 'sessionbyip' cache.
461 // Note that we add the zero address in the case of
462 // a network route. Roll on CIDR.
463
464 // Note that 's == 0' implies this is the address pool.
465 // We still cache it here, because it will pre-fill
466 // the malloc'ed tree.
467
468 if (s)
469 {
470 if (!add) // Are we deleting a route?
471 s = 0; // Caching the session as '0' is the same as uncaching.
472
473 for (i = ip; (i&mask) == (ip&mask) ; ++i)
474 cache_ipmap(i, s);
475 }
476 }
477
478 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
479 {
480 struct in6_rtmsg rt;
481 char ipv6addr[INET6_ADDRSTRLEN];
482
483 if (ifr6fd < 0)
484 {
485 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
486 return;
487 }
488
489 memset(&rt, 0, sizeof(rt));
490
491 memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
492 rt.rtmsg_dst_len = prefixlen;
493 rt.rtmsg_metric = 1;
494 rt.rtmsg_flags = RTF_UP;
495 rt.rtmsg_ifindex = tunidx;
496
497 LOG(1, 0, 0, "Route %s %s/%d\n",
498 add ? "add" : "del",
499 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
500 prefixlen);
501
502 if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
503 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
504 strerror(errno));
505
506 // FIXME: need to add BGP routing (RFC2858)
507
508 if (s)
509 {
510 if (!add) // Are we deleting a route?
511 s = 0; // Caching the session as '0' is the same as uncaching.
512
513 cache_ipv6map(ip, prefixlen, s);
514 }
515
516 return;
517 }
518
519 //
520 // Set up netlink socket
521 static void initnetlink(void)
522 {
523 struct sockaddr_nl nladdr;
524
525 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
526 if (nlfd < 0)
527 {
528 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
529 exit(1);
530 }
531
532 memset(&nladdr, 0, sizeof(nladdr));
533 nladdr.nl_family = AF_NETLINK;
534 nladdr.nl_pid = getpid();
535
536 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
537 {
538 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
539 exit(1);
540 }
541 }
542
543 static ssize_t netlink_send(struct nlmsghdr *nh)
544 {
545 struct sockaddr_nl nladdr;
546 struct iovec iov;
547 struct msghdr msg;
548
549 nh->nlmsg_pid = getpid();
550 nh->nlmsg_seq = ++nlseqnum;
551
552 // set kernel address
553 memset(&nladdr, 0, sizeof(nladdr));
554 nladdr.nl_family = AF_NETLINK;
555
556 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
557 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
558
559 return sendmsg(nlfd, &msg, 0);
560 }
561
562 static ssize_t netlink_recv(char *buf, ssize_t len)
563 {
564 struct sockaddr_nl nladdr;
565 struct iovec iov;
566 struct msghdr msg;
567
568 // set kernel address
569 memset(&nladdr, 0, sizeof(nladdr));
570 nladdr.nl_family = AF_NETLINK;
571
572 iov = (struct iovec){ buf, len };
573 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
574
575 return recvmsg(nlfd, &msg, 0);
576 }
577
578 //
579 // Set up TUN interface
580 static void inittun(void)
581 {
582 struct ifinfomsg ifinfo;
583 struct ifreq ifr;
584
585 memset(&ifr, 0, sizeof(ifr));
586 ifr.ifr_flags = IFF_TUN;
587
588 tunfd = open(TUNDEVICE, O_RDWR);
589 if (tunfd < 0)
590 { // fatal
591 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
592 exit(1);
593 }
594 {
595 int flags = fcntl(tunfd, F_GETFL, 0);
596 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
597 }
598 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
599 {
600 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
601 exit(1);
602 }
603 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
604 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
605
606 {
607 // get the interface index
608 struct {
609 struct nlmsghdr nh;
610 struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
611 struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
612 char ifname[IFNAMSIZ];
613 } req;
614 char buf[4096];
615 ssize_t len;
616 struct nlmsghdr *resp_nh;
617
618 req.nh.nlmsg_type = RTM_GETLINK;
619 req.nh.nlmsg_flags = NLM_F_REQUEST;
620
621 req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
622
623 req.ifname_rta.rta_len = RTA_LENGTH(strlen(config->tundevice)+1);
624 req.ifname_rta.rta_type = IFLA_IFNAME;
625 strncpy(req.ifname, config->tundevice, IFNAMSIZ-1);
626
627 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
628 + req.ifname_rta.rta_len);
629
630 if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
631 {
632 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
633 exit(1);
634 }
635
636 resp_nh = (struct nlmsghdr *)buf;
637 if (!NLMSG_OK (resp_nh, len))
638 {
639 LOG(0, 0, 0, "Malformed answer getting tun ifindex %d\n", len);
640 exit(1);
641 }
642
643 memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
644 // got index
645 tunidx = ifinfo.ifi_index;
646 }
647 {
648 struct {
649 // interface setting
650 struct nlmsghdr nh;
651 union {
652 struct ifinfomsg ifinfo;
653 struct ifaddrmsg ifaddr;
654 } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
655 char rtdata[32]; // 32 should be enough
656 } req;
657 struct {
658 struct rtattr rta;
659 uint32_t u32 __attribute__ ((aligned(RTA_ALIGNTO)));;
660 } u32_attr;
661 struct {
662 struct rtattr rta;
663 struct in_addr addr __attribute__ ((aligned(RTA_ALIGNTO)));;
664 } ipv4_attr;
665 struct {
666 struct rtattr rta;
667 struct in6_addr addr6 __attribute__ ((aligned(RTA_ALIGNTO)));;
668 } ipv6_attr;
669 char *buf_ptr;
670
671 memset(&req, 0, sizeof(req));
672
673 req.nh.nlmsg_type = RTM_SETLINK;
674 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
675
676 req.ifmsg.ifinfo = ifinfo;
677 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
678 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
679
680 buf_ptr = NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifinfo);
681
682 u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
683 u32_attr.rta.rta_type = IFLA_TXQLEN;
684 /* Bump up the qlen to deal with bursts from the network */
685 u32_attr.u32 = 1000;
686 memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
687
688 buf_ptr += RTA_ALIGN(u32_attr.rta.rta_len);
689
690 u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
691 u32_attr.rta.rta_type = IFLA_MTU;
692 /* set MTU to modem MRU */
693 u32_attr.u32 = MRU;
694 memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
695
696 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo)
697 + u32_attr.rta.rta_len * 2);
698
699 if (netlink_send(&req.nh) < 0)
700 {
701 LOG(0, 0, 0, "Error setting up tun device interface: %s\n", strerror(errno));
702 exit(1);
703 }
704
705 memset(&req, 0, sizeof(req));
706
707 req.nh.nlmsg_type = RTM_NEWADDR;
708 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
709
710 req.ifmsg.ifaddr.ifa_family = AF_INET;
711 req.ifmsg.ifaddr.ifa_prefixlen = 32;
712 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
713
714 ipv4_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv4_attr.addr));
715 ipv4_attr.rta.rta_type = IFA_ADDRESS;
716 ipv4_attr.addr.s_addr = config->bind_address ?
717 config->bind_address : 0x01010101; // 1.1.1.1
718 memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv4_attr, sizeof(ipv4_attr));
719
720 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
721 + ipv4_attr.rta.rta_len);
722
723 if (netlink_send(&req.nh) < 0)
724 {
725 LOG(0, 0, 0, "Error setting up tun device IPv4 address: %s\n", strerror(errno));
726 exit(1);
727 }
728
729 // Only setup IPv6 on the tun device if we have a configured prefix
730 if (config->ipv6_prefix.s6_addr[0]) {
731 memset(&req, 0, sizeof(req));
732
733 req.nh.nlmsg_type = RTM_NEWADDR;
734 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
735
736 req.ifmsg.ifaddr.ifa_family = AF_INET6;
737 req.ifmsg.ifaddr.ifa_prefixlen = 64;
738 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
739 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
740
741 ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
742 ipv6_attr.rta.rta_type = IFA_LOCAL;
743 // Link local address is FE80::1
744 memset(&ipv6_attr.addr6, 0, sizeof(ipv6_attr.addr6));
745 ipv6_attr.addr6.s6_addr[0] = 0xFE;
746 ipv6_attr.addr6.s6_addr[1] = 0x80;
747 ipv6_attr.addr6.s6_addr[15] = 1;
748 memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
749
750 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
751 + ipv6_attr.rta.rta_len);
752
753 if (netlink_send(&req.nh) < 0)
754 {
755 LOG(0, 0, 0, "Error setting up tun device IPv6 LL address: %s\n", strerror(errno));
756 exit(1);
757 }
758
759 memset(&req, 0, sizeof(req));
760
761 req.nh.nlmsg_type = RTM_NEWADDR;
762 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
763
764 req.ifmsg.ifaddr.ifa_family = AF_INET6;
765 req.ifmsg.ifaddr.ifa_prefixlen = 64;
766 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
767 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
768
769 ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
770 ipv6_attr.rta.rta_type = IFA_LOCAL;
771 // Global address is prefix::1
772 ipv6_attr.addr6 = config->ipv6_prefix;
773 ipv6_attr.addr6.s6_addr[15] = 1;
774 memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
775
776 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
777 + ipv6_attr.rta.rta_len);
778
779 if (netlink_send(&req.nh) < 0)
780 {
781 LOG(0, 0, 0, "Error setting up tun device IPv6 global address: %s\n", strerror(errno));
782 exit(1);
783 }
784 }
785
786 memset(&req, 0, sizeof(req));
787
788 req.nh.nlmsg_type = NLMSG_DONE;
789 req.nh.nlmsg_len = NLMSG_LENGTH(0);
790
791 if (netlink_send(&req.nh) < 0)
792 {
793 LOG(0, 0, 0, "Error finishing setting up tun device: %s\n", strerror(errno));
794 exit(1);
795 }
796 }
797 }
798
799 // set up UDP ports
800 static void initudp(void)
801 {
802 int on = 1;
803 struct sockaddr_in addr;
804
805 // Tunnel
806 memset(&addr, 0, sizeof(addr));
807 addr.sin_family = AF_INET;
808 addr.sin_port = htons(L2TPPORT);
809 addr.sin_addr.s_addr = config->bind_address;
810 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
811 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
812 {
813 int flags = fcntl(udpfd, F_GETFL, 0);
814 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
815 }
816 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
817 {
818 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
819 exit(1);
820 }
821
822 // Control
823 memset(&addr, 0, sizeof(addr));
824 addr.sin_family = AF_INET;
825 addr.sin_port = htons(NSCTL_PORT);
826 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
827 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
828 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
829 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
830 {
831 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
832 exit(1);
833 }
834
835 // Dynamic Authorization Extensions to RADIUS
836 memset(&addr, 0, sizeof(addr));
837 addr.sin_family = AF_INET;
838 addr.sin_port = htons(config->radius_dae_port);
839 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
840 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
841 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
842 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
843 {
844 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
845 exit(1);
846 }
847
848 // Intercept
849 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
850 }
851
852 //
853 // Find session by IP, < 1 for not found
854 //
855 // Confusingly enough, this 'ip' must be
856 // in _network_ order. This being the common
857 // case when looking it up from IP packet headers.
858 //
859 // We actually use this cache for two things.
860 // #1. For used IP addresses, this maps to the
861 // session ID that it's used by.
862 // #2. For un-used IP addresses, this maps to the
863 // index into the pool table that contains that
864 // IP address.
865 //
866
867 static sessionidt lookup_ipmap(in_addr_t ip)
868 {
869 uint8_t *a = (uint8_t *) &ip;
870 union iphash *h = ip_hash;
871
872 if (!(h = h[*a++].idx)) return 0;
873 if (!(h = h[*a++].idx)) return 0;
874 if (!(h = h[*a++].idx)) return 0;
875
876 return h[*a].sess;
877 }
878
879 static sessionidt lookup_ipv6map(struct in6_addr ip)
880 {
881 struct ipv6radix *curnode;
882 int i;
883 int s;
884 char ipv6addr[INET6_ADDRSTRLEN];
885
886 curnode = &ipv6_hash[ip.s6_addr[0]];
887 i = 1;
888 s = curnode->sess;
889
890 while (s == 0 && i < 15 && curnode->branch != NULL)
891 {
892 curnode = &curnode->branch[ip.s6_addr[i]];
893 s = curnode->sess;
894 i++;
895 }
896
897 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
898 inet_ntop(AF_INET6, &ip, ipv6addr,
899 INET6_ADDRSTRLEN),
900 s);
901
902 return s;
903 }
904
905 sessionidt sessionbyip(in_addr_t ip)
906 {
907 sessionidt s = lookup_ipmap(ip);
908 CSTAT(sessionbyip);
909
910 if (s > 0 && s < MAXSESSION && session[s].opened)
911 return s;
912
913 return 0;
914 }
915
916 sessionidt sessionbyipv6(struct in6_addr ip)
917 {
918 sessionidt s;
919 CSTAT(sessionbyipv6);
920
921 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
922 (ip.s6_addr[0] == 0xFE &&
923 ip.s6_addr[1] == 0x80 &&
924 ip.s6_addr16[1] == 0 &&
925 ip.s6_addr16[2] == 0 &&
926 ip.s6_addr16[3] == 0)) {
927 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
928 } else {
929 s = lookup_ipv6map(ip);
930 }
931
932 if (s > 0 && s < MAXSESSION && session[s].opened)
933 return s;
934
935 return 0;
936 }
937
938 //
939 // Take an IP address in HOST byte order and
940 // add it to the sessionid by IP cache.
941 //
942 // (It's actually cached in network order)
943 //
944 static void cache_ipmap(in_addr_t ip, sessionidt s)
945 {
946 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
947 uint8_t *a = (uint8_t *) &nip;
948 union iphash *h = ip_hash;
949 int i;
950
951 for (i = 0; i < 3; i++)
952 {
953 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
954 return;
955
956 h = h[a[i]].idx;
957 }
958
959 h[a[3]].sess = s;
960
961 if (s > 0)
962 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
963
964 else if (s == 0)
965 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
966 // else a map to an ip pool index.
967 }
968
969 static void uncache_ipmap(in_addr_t ip)
970 {
971 cache_ipmap(ip, 0); // Assign it to the NULL session.
972 }
973
974 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
975 {
976 int i;
977 int bytes;
978 struct ipv6radix *curnode;
979 char ipv6addr[INET6_ADDRSTRLEN];
980
981 curnode = &ipv6_hash[ip.s6_addr[0]];
982
983 bytes = prefixlen >> 3;
984 i = 1;
985 while (i < bytes) {
986 if (curnode->branch == NULL)
987 {
988 if (!(curnode->branch = calloc(256,
989 sizeof (struct ipv6radix))))
990 return;
991 }
992 curnode = &curnode->branch[ip.s6_addr[i]];
993 i++;
994 }
995
996 curnode->sess = s;
997
998 if (s > 0)
999 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1000 inet_ntop(AF_INET6, &ip, ipv6addr,
1001 INET6_ADDRSTRLEN),
1002 prefixlen);
1003 else if (s == 0)
1004 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1005 inet_ntop(AF_INET6, &ip, ipv6addr,
1006 INET6_ADDRSTRLEN),
1007 prefixlen);
1008 }
1009
1010 //
1011 // CLI list to dump current ipcache.
1012 //
1013 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1014 {
1015 union iphash *d = ip_hash, *e, *f, *g;
1016 int i, j, k, l;
1017 int count = 0;
1018
1019 if (CLI_HELP_REQUESTED)
1020 return CLI_HELP_NO_ARGS;
1021
1022 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1023
1024 for (i = 0; i < 256; ++i)
1025 {
1026 if (!d[i].idx)
1027 continue;
1028
1029 e = d[i].idx;
1030 for (j = 0; j < 256; ++j)
1031 {
1032 if (!e[j].idx)
1033 continue;
1034
1035 f = e[j].idx;
1036 for (k = 0; k < 256; ++k)
1037 {
1038 if (!f[k].idx)
1039 continue;
1040
1041 g = f[k].idx;
1042 for (l = 0; l < 256; ++l)
1043 {
1044 if (!g[l].sess)
1045 continue;
1046
1047 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1048 ++count;
1049 }
1050 }
1051 }
1052 }
1053 cli_print(cli, "%d entries in cache", count);
1054 return CLI_OK;
1055 }
1056
1057
1058 // Find session by username, 0 for not found
1059 // walled garden users aren't authenticated, so the username is
1060 // reasonably useless. Ignore them to avoid incorrect actions
1061 //
1062 // This is VERY inefficent. Don't call it often. :)
1063 //
1064 sessionidt sessionbyuser(char *username)
1065 {
1066 int s;
1067 CSTAT(sessionbyuser);
1068
1069 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1070 {
1071 if (!session[s].opened)
1072 continue;
1073
1074 if (session[s].walled_garden)
1075 continue; // Skip walled garden users.
1076
1077 if (!strncmp(session[s].user, username, 128))
1078 return s;
1079
1080 }
1081 return 0; // Not found.
1082 }
1083
1084 void send_garp(in_addr_t ip)
1085 {
1086 int s;
1087 struct ifreq ifr;
1088 uint8_t mac[6];
1089
1090 s = socket(PF_INET, SOCK_DGRAM, 0);
1091 if (s < 0)
1092 {
1093 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1094 return;
1095 }
1096 memset(&ifr, 0, sizeof(ifr));
1097 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1098 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1099 {
1100 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1101 close(s);
1102 return;
1103 }
1104 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1105 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1106 {
1107 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1108 close(s);
1109 return;
1110 }
1111 close(s);
1112 sendarp(ifr.ifr_ifindex, mac, ip);
1113 }
1114
1115 static sessiont *sessiontbysessionidt(sessionidt s)
1116 {
1117 if (!s || s >= MAXSESSION) return NULL;
1118 return &session[s];
1119 }
1120
1121 static sessionidt sessionidtbysessiont(sessiont *s)
1122 {
1123 sessionidt val = s-session;
1124 if (s < session || val >= MAXSESSION) return 0;
1125 return val;
1126 }
1127
1128 // actually send a control message for a specific tunnel
1129 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1130 {
1131 struct sockaddr_in addr;
1132
1133 CSTAT(tunnelsend);
1134
1135 if (!t)
1136 {
1137 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1138 STAT(tunnel_tx_errors);
1139 return;
1140 }
1141
1142 if (!tunnel[t].ip)
1143 {
1144 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1145 STAT(tunnel_tx_errors);
1146 return;
1147 }
1148
1149 memset(&addr, 0, sizeof(addr));
1150 addr.sin_family = AF_INET;
1151 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1152 addr.sin_port = htons(tunnel[t].port);
1153
1154 // sequence expected, if sequence in message
1155 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1156
1157 // If this is a control message, deal with retries
1158 if (*buf & 0x80)
1159 {
1160 tunnel[t].last = time_now; // control message sent
1161 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1162 if (tunnel[t].try)
1163 {
1164 STAT(tunnel_retries);
1165 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1166 }
1167 }
1168
1169 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1170 {
1171 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1172 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1173 STAT(tunnel_tx_errors);
1174 return;
1175 }
1176
1177 LOG_HEX(5, "Send Tunnel Data", buf, l);
1178 STAT(tunnel_tx_packets);
1179 INC_STAT(tunnel_tx_bytes, l);
1180 }
1181
1182 //
1183 // Tiny helper function to write data to
1184 // the 'tun' device.
1185 //
1186 int tun_write(uint8_t * data, int size)
1187 {
1188 return write(tunfd, data, size);
1189 }
1190
1191 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1192 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1193 {
1194 int d = (tcp[12] >> 4) * 4;
1195 uint8_t *mss = 0;
1196 uint8_t *opts;
1197 uint8_t *data;
1198 uint16_t orig;
1199 uint32_t sum;
1200
1201 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1202 return;
1203
1204 if (tcp + d > buf + len) // short?
1205 return;
1206
1207 opts = tcp + 20;
1208 data = tcp + d;
1209
1210 while (opts < data)
1211 {
1212 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1213 {
1214 mss = opts + 2;
1215 if (mss + 2 > data) return; // short?
1216 break;
1217 }
1218
1219 if (*opts == 0) return; // end of options
1220 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1221 opts++;
1222 else
1223 opts += opts[1]; // skip over option
1224 }
1225
1226 if (!mss) return; // not found
1227 orig = ntohs(*(uint16_t *) mss);
1228
1229 if (orig <= MSS) return; // mss OK
1230
1231 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1232 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1233 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1234 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1235
1236 // set mss
1237 *(int16_t *) mss = htons(MSS);
1238
1239 // adjust checksum (see rfc1141)
1240 sum = orig + (~MSS & 0xffff);
1241 sum += ntohs(*(uint16_t *) (tcp + 16));
1242 sum = (sum & 0xffff) + (sum >> 16);
1243 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1244 }
1245
1246 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1247 {
1248 uint16_t proto;
1249 if (extra) {
1250 // Skip the four extra bytes
1251 p += 4;
1252 l -= 4;
1253 }
1254
1255 if (*p & 1)
1256 {
1257 proto = *p++;
1258 l--;
1259 }
1260 else
1261 {
1262 proto = ntohs(*(uint16_t *) p);
1263 p += 2;
1264 l -= 2;
1265 }
1266 if (proto == PPPIP)
1267 {
1268 if (session[s].die)
1269 {
1270 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1271 return; // closing session, PPP not processed
1272 }
1273 session[s].last_packet = session[s].last_data = time_now;
1274 processipin(s, t, p, l);
1275 }
1276 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1277 {
1278 if (session[s].die)
1279 {
1280 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1281 return; // closing session, PPP not processed
1282 }
1283
1284 session[s].last_packet = session[s].last_data = time_now;
1285 processipv6in(s, t, p, l);
1286 }
1287 else if (proto == PPPIPCP)
1288 {
1289 session[s].last_packet = session[s].last_data = time_now;
1290 processipcp(s, t, p, l);
1291 }
1292 else if (proto == PPPCCP)
1293 {
1294 session[s].last_packet = session[s].last_data = time_now;
1295 processccp(s, t, p, l);
1296 }
1297 else
1298 {
1299 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1300 }
1301 }
1302
1303 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1304 {
1305 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1306 sp->cout_delta += len;
1307 sp->pout++;
1308 sp->last_data = time_now;
1309
1310 sess_local[s].cout += len; // To send to master..
1311 sess_local[s].pout++;
1312 }
1313
1314 // process outgoing (to tunnel) IP
1315 //
1316 static void processipout(uint8_t *buf, int len)
1317 {
1318 sessionidt s;
1319 sessiont *sp;
1320 tunnelidt t;
1321 in_addr_t ip;
1322
1323 uint8_t *data = buf; // Keep a copy of the originals.
1324 int size = len;
1325
1326 uint8_t fragbuf[MAXETHER + 20];
1327
1328 CSTAT(processipout);
1329
1330 if (len < MIN_IP_SIZE)
1331 {
1332 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1333 STAT(tun_rx_errors);
1334 return;
1335 }
1336 if (len >= MAXETHER)
1337 {
1338 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1339 STAT(tun_rx_errors);
1340 return;
1341 }
1342
1343 // Skip the tun header
1344 buf += 4;
1345 len -= 4;
1346
1347 // Got an IP header now
1348 if (*(uint8_t *)(buf) >> 4 != 4)
1349 {
1350 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1351 return;
1352 }
1353
1354 ip = *(uint32_t *)(buf + 16);
1355 if (!(s = sessionbyip(ip)))
1356 {
1357 // Is this a packet for a session that doesn't exist?
1358 static int rate = 0; // Number of ICMP packets we've sent this second.
1359 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1360
1361 if (last != time_now)
1362 {
1363 last = time_now;
1364 rate = 0;
1365 }
1366
1367 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1368 {
1369 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1370 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1371 config->bind_address ? config->bind_address : my_address, buf, len);
1372 }
1373 return;
1374 }
1375
1376 t = session[s].tunnel;
1377 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1378 {
1379 LOG(3, s, t, "Packet size more than session MRU\n");
1380 return;
1381 }
1382
1383 sp = &session[s];
1384
1385 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1386 if (config->max_packets > 0)
1387 {
1388 if (sess_local[s].last_packet_out == TIME)
1389 {
1390 int max = config->max_packets;
1391
1392 // All packets for throttled sessions are handled by the
1393 // master, so further limit by using the throttle rate.
1394 // A bit of a kludge, since throttle rate is in kbps,
1395 // but should still be generous given our average DSL
1396 // packet size is 200 bytes: a limit of 28kbps equates
1397 // to around 180 packets per second.
1398 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1399 max = sp->throttle_out;
1400
1401 if (++sess_local[s].packets_out > max)
1402 {
1403 sess_local[s].packets_dropped++;
1404 return;
1405 }
1406 }
1407 else
1408 {
1409 if (sess_local[s].packets_dropped)
1410 {
1411 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1412 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1413 sess_local[s].packets_dropped, sess_local[s].packets_out,
1414 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1415 sp->user);
1416 }
1417
1418 sess_local[s].last_packet_out = TIME;
1419 sess_local[s].packets_out = 1;
1420 sess_local[s].packets_dropped = 0;
1421 }
1422 }
1423
1424 // run access-list if any
1425 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1426 return;
1427
1428 // adjust MSS on SYN and SYN,ACK packets with options
1429 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1430 {
1431 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1432 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1433 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1434 }
1435
1436 if (sp->tbf_out)
1437 {
1438 // Are we throttling this session?
1439 if (config->cluster_iam_master)
1440 tbf_queue_packet(sp->tbf_out, data, size);
1441 else
1442 master_throttle_packet(sp->tbf_out, data, size);
1443 return;
1444 }
1445
1446 if (sp->walled_garden && !config->cluster_iam_master)
1447 {
1448 // We are walled-gardening this
1449 master_garden_packet(s, data, size);
1450 return;
1451 }
1452
1453 // Add on L2TP header
1454 {
1455 bundleidt bid = 0;
1456 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1457 {
1458 bid = session[s].bundle;
1459 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1460 t = session[s].tunnel;
1461 sp = &session[s];
1462 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1463 if(len > MINFRAGLEN)
1464 {
1465 // Partition the packet to "bundle[b].num_of_links" fragments
1466 bundlet *b = &bundle[bid];
1467 uint32_t num_of_links = b->num_of_links;
1468 uint32_t fraglen = len / num_of_links;
1469 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1470 uint32_t last_fraglen = fraglen + len % num_of_links;
1471 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1472 uint32_t remain = len;
1473
1474 // send the first packet
1475 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1476 if (!p) return;
1477 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1478 // statistics
1479 update_session_out_stat(s, sp, fraglen);
1480 remain -= fraglen;
1481 while (remain > last_fraglen)
1482 {
1483 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1484 t = session[s].tunnel;
1485 sp = &session[s];
1486 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1487 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1488 if (!p) return;
1489 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1490 update_session_out_stat(s, sp, fraglen);
1491 remain -= fraglen;
1492 }
1493 // send the last fragment
1494 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1495 t = session[s].tunnel;
1496 sp = &session[s];
1497 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1498 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1499 if (!p) return;
1500 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1501 update_session_out_stat(s, sp, remain);
1502 if (remain != last_fraglen)
1503 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1504 }
1505 else {
1506 // Send it as one frame
1507 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1508 if (!p) return;
1509 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1510 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1511 update_session_out_stat(s, sp, len);
1512 }
1513 }
1514 else
1515 {
1516 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1517 if (!p) return;
1518 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1519 update_session_out_stat(s, sp, len);
1520 }
1521 }
1522
1523 // Snooping this session, send it to intercept box
1524 if (sp->snoop_ip && sp->snoop_port)
1525 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1526
1527 udp_tx += len;
1528 }
1529
1530 // process outgoing (to tunnel) IPv6
1531 //
1532 static void processipv6out(uint8_t * buf, int len)
1533 {
1534 sessionidt s;
1535 sessiont *sp;
1536 tunnelidt t;
1537 in_addr_t ip;
1538 struct in6_addr ip6;
1539
1540 uint8_t *data = buf; // Keep a copy of the originals.
1541 int size = len;
1542
1543 uint8_t b[MAXETHER + 20];
1544
1545 CSTAT(processipv6out);
1546
1547 if (len < MIN_IP_SIZE)
1548 {
1549 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1550 STAT(tunnel_tx_errors);
1551 return;
1552 }
1553 if (len >= MAXETHER)
1554 {
1555 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1556 STAT(tunnel_tx_errors);
1557 return;
1558 }
1559
1560 // Skip the tun header
1561 buf += 4;
1562 len -= 4;
1563
1564 // Got an IP header now
1565 if (*(uint8_t *)(buf) >> 4 != 6)
1566 {
1567 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1568 return;
1569 }
1570
1571 ip6 = *(struct in6_addr *)(buf+24);
1572 s = sessionbyipv6(ip6);
1573
1574 if (s == 0)
1575 {
1576 ip = *(uint32_t *)(buf + 32);
1577 s = sessionbyip(ip);
1578 }
1579
1580 if (s == 0)
1581 {
1582 // Is this a packet for a session that doesn't exist?
1583 static int rate = 0; // Number of ICMP packets we've sent this second.
1584 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1585
1586 if (last != time_now)
1587 {
1588 last = time_now;
1589 rate = 0;
1590 }
1591
1592 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1593 {
1594 // FIXME: Should send icmp6 host unreachable
1595 }
1596 return;
1597 }
1598 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1599 {
1600 bundleidt bid = session[s].bundle;
1601 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1602 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1603 }
1604 t = session[s].tunnel;
1605 sp = &session[s];
1606 sp->last_data = time_now;
1607
1608 // FIXME: add DoS prevention/filters?
1609
1610 if (sp->tbf_out)
1611 {
1612 // Are we throttling this session?
1613 if (config->cluster_iam_master)
1614 tbf_queue_packet(sp->tbf_out, data, size);
1615 else
1616 master_throttle_packet(sp->tbf_out, data, size);
1617 return;
1618 }
1619 else if (sp->walled_garden && !config->cluster_iam_master)
1620 {
1621 // We are walled-gardening this
1622 master_garden_packet(s, data, size);
1623 return;
1624 }
1625
1626 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1627
1628 // Add on L2TP header
1629 {
1630 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1631 if (!p) return;
1632 tunnelsend(b, len + (p-b), t); // send it...
1633 }
1634
1635 // Snooping this session, send it to intercept box
1636 if (sp->snoop_ip && sp->snoop_port)
1637 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1638
1639 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1640 sp->cout_delta += len;
1641 sp->pout++;
1642 udp_tx += len;
1643
1644 sess_local[s].cout += len; // To send to master..
1645 sess_local[s].pout++;
1646 }
1647
1648 //
1649 // Helper routine for the TBF filters.
1650 // Used to send queued data in to the user!
1651 //
1652 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1653 {
1654 sessiont *sp;
1655 tunnelidt t;
1656 in_addr_t ip;
1657
1658 uint8_t b[MAXETHER + 20];
1659
1660 if (len < 0 || len > MAXETHER)
1661 {
1662 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1663 return;
1664 }
1665
1666 // Skip the tun header
1667 buf += 4;
1668 len -= 4;
1669
1670 ip = *(in_addr_t *)(buf + 16);
1671
1672 if (!session[s].ip)
1673 return;
1674
1675 t = session[s].tunnel;
1676 sp = &session[s];
1677
1678 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1679
1680 // Add on L2TP header
1681 {
1682 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1683 if (!p) return;
1684 tunnelsend(b, len + (p-b), t); // send it...
1685 }
1686
1687 // Snooping this session.
1688 if (sp->snoop_ip && sp->snoop_port)
1689 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1690
1691 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1692 sp->cout_delta += len;
1693 sp->pout++;
1694 udp_tx += len;
1695
1696 sess_local[s].cout += len; // To send to master..
1697 sess_local[s].pout++;
1698 }
1699
1700 // add an AVP (16 bit)
1701 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1702 {
1703 uint16_t l = (m ? 0x8008 : 0x0008);
1704 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1705 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1706 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1707 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1708 c->length += 8;
1709 }
1710
1711 // add an AVP (32 bit)
1712 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1713 {
1714 uint16_t l = (m ? 0x800A : 0x000A);
1715 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1716 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1717 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1718 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1719 c->length += 10;
1720 }
1721
1722 // add an AVP (string)
1723 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1724 {
1725 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1726 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1727 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1728 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1729 memcpy(c->buf + c->length + 6, val, strlen(val));
1730 c->length += 6 + strlen(val);
1731 }
1732
1733 // add a binary AVP
1734 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1735 {
1736 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1737 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1738 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1739 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1740 memcpy(c->buf + c->length + 6, val, len);
1741 c->length += 6 + len;
1742 }
1743
1744 // new control connection
1745 static controlt *controlnew(uint16_t mtype)
1746 {
1747 controlt *c;
1748 if (!controlfree)
1749 c = malloc(sizeof(controlt));
1750 else
1751 {
1752 c = controlfree;
1753 controlfree = c->next;
1754 }
1755 assert(c);
1756 c->next = 0;
1757 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1758 c->length = 12;
1759 control16(c, 0, mtype, 1);
1760 return c;
1761 }
1762
1763 // send zero block if nothing is waiting
1764 // (ZLB send).
1765 static void controlnull(tunnelidt t)
1766 {
1767 uint8_t buf[12];
1768 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1769 return;
1770
1771 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1772 *(uint16_t *) (buf + 2) = htons(12); // length
1773 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1774 *(uint16_t *) (buf + 6) = htons(0); // session
1775 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1776 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1777 tunnelsend(buf, 12, t);
1778 }
1779
1780 // add a control message to a tunnel, and send if within window
1781 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1782 {
1783 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1784 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1785 *(uint16_t *) (c->buf + 6) = htons(far); // session
1786 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1787 tunnel[t].ns++; // advance sequence
1788 // link in message in to queue
1789 if (tunnel[t].controlc)
1790 tunnel[t].controle->next = c;
1791 else
1792 tunnel[t].controls = c;
1793
1794 tunnel[t].controle = c;
1795 tunnel[t].controlc++;
1796
1797 // send now if space in window
1798 if (tunnel[t].controlc <= tunnel[t].window)
1799 {
1800 tunnel[t].try = 0; // first send
1801 tunnelsend(c->buf, c->length, t);
1802 }
1803 }
1804
1805 //
1806 // Throttle or Unthrottle a session
1807 //
1808 // Throttle the data from/to through a session to no more than
1809 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1810 // user).
1811 //
1812 // If either value is -1, the current value is retained for that
1813 // direction.
1814 //
1815 void throttle_session(sessionidt s, int rate_in, int rate_out)
1816 {
1817 if (!session[s].opened)
1818 return; // No-one home.
1819
1820 if (!*session[s].user)
1821 return; // User not logged in
1822
1823 if (rate_in >= 0)
1824 {
1825 int bytes = rate_in * 1024 / 8; // kbits to bytes
1826 if (session[s].tbf_in)
1827 free_tbf(session[s].tbf_in);
1828
1829 if (rate_in > 0)
1830 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1831 else
1832 session[s].tbf_in = 0;
1833
1834 session[s].throttle_in = rate_in;
1835 }
1836
1837 if (rate_out >= 0)
1838 {
1839 int bytes = rate_out * 1024 / 8;
1840 if (session[s].tbf_out)
1841 free_tbf(session[s].tbf_out);
1842
1843 if (rate_out > 0)
1844 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1845 else
1846 session[s].tbf_out = 0;
1847
1848 session[s].throttle_out = rate_out;
1849 }
1850 }
1851
1852 // add/remove filters from session (-1 = no change)
1853 void filter_session(sessionidt s, int filter_in, int filter_out)
1854 {
1855 if (!session[s].opened)
1856 return; // No-one home.
1857
1858 if (!*session[s].user)
1859 return; // User not logged in
1860
1861 // paranoia
1862 if (filter_in > MAXFILTER) filter_in = -1;
1863 if (filter_out > MAXFILTER) filter_out = -1;
1864 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1865 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1866
1867 if (filter_in >= 0)
1868 {
1869 if (session[s].filter_in)
1870 ip_filters[session[s].filter_in - 1].used--;
1871
1872 if (filter_in > 0)
1873 ip_filters[filter_in - 1].used++;
1874
1875 session[s].filter_in = filter_in;
1876 }
1877
1878 if (filter_out >= 0)
1879 {
1880 if (session[s].filter_out)
1881 ip_filters[session[s].filter_out - 1].used--;
1882
1883 if (filter_out > 0)
1884 ip_filters[filter_out - 1].used++;
1885
1886 session[s].filter_out = filter_out;
1887 }
1888 }
1889
1890 // start tidy shutdown of session
1891 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1892 {
1893 int walled_garden = session[s].walled_garden;
1894 bundleidt b = session[s].bundle;
1895 //delete routes only for last session in bundle (in case of MPPP)
1896 int del_routes = !b || (bundle[b].num_of_links == 1);
1897
1898 CSTAT(sessionshutdown);
1899
1900 if (!session[s].opened)
1901 {
1902 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1903 return; // not a live session
1904 }
1905
1906 if (!session[s].die)
1907 {
1908 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1909 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1910 run_plugins(PLUGIN_KILL_SESSION, &data);
1911 session[s].die = TIME + 150; // Clean up in 15 seconds
1912 }
1913
1914 if (session[s].ip && !walled_garden && !session[s].die)
1915 {
1916 // RADIUS Stop message
1917 uint16_t r = radiusnew(s);
1918 if (r)
1919 {
1920 // stop, if not already trying
1921 if (radius[r].state != RADIUSSTOP)
1922 {
1923 radius[r].term_cause = term_cause;
1924 radius[r].term_msg = reason;
1925 radiussend(r, RADIUSSTOP);
1926 }
1927 }
1928 else
1929 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1930
1931 // Save counters to dump to accounting file
1932 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1933 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1934 }
1935
1936 if (session[s].ip)
1937 { // IP allocated, clear and unroute
1938 int r;
1939 int routed = 0;
1940 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1941 {
1942 if ((session[s].ip & session[s].route[r].mask) ==
1943 (session[s].route[r].ip & session[s].route[r].mask))
1944 routed++;
1945
1946 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
1947 session[s].route[r].ip = 0;
1948 }
1949
1950 if (session[s].ip_pool_index == -1) // static ip
1951 {
1952 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1953 session[s].ip = 0;
1954 }
1955 else
1956 free_ip_address(s);
1957
1958 // unroute IPv6, if setup
1959 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1960 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1961
1962 if (b)
1963 {
1964 // This session was part of a bundle
1965 bundle[b].num_of_links--;
1966 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1967 if(bundle[b].num_of_links == 0)
1968 {
1969 bundleclear(b);
1970 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1971 }
1972 else
1973 {
1974 // Adjust the members array to accomodate the new change
1975 uint8_t mem_num = 0;
1976 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1977 if(bundle[b].members[bundle[b].num_of_links] != s)
1978 {
1979 uint8_t ml;
1980 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1981 if(bundle[b].members[ml] == s)
1982 {
1983 mem_num = ml;
1984 break;
1985 }
1986 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1987 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
1988 }
1989 }
1990 cluster_send_bundle(b);
1991 }
1992 }
1993
1994 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
1995 throttle_session(s, 0, 0);
1996
1997 if (cdn_result)
1998 { // Send CDN
1999 controlt *c = controlnew(14); // sending CDN
2000 if (cdn_error)
2001 {
2002 uint8_t buf[4];
2003 *(uint16_t *) buf = htons(cdn_result);
2004 *(uint16_t *) (buf+2) = htons(cdn_error);
2005 controlb(c, 1, buf, 4, 1);
2006 }
2007 else
2008 control16(c, 1, cdn_result, 1);
2009
2010 control16(c, 14, s, 1); // assigned session (our end)
2011 controladd(c, session[s].far, session[s].tunnel); // send the message
2012 }
2013
2014 // update filter refcounts
2015 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2016 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2017
2018 // clear PPP state
2019 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2020 sess_local[s].lcp.restart = 0;
2021 sess_local[s].ipcp.restart = 0;
2022 sess_local[s].ipv6cp.restart = 0;
2023 sess_local[s].ccp.restart = 0;
2024
2025 cluster_send_session(s);
2026 }
2027
2028 void sendipcp(sessionidt s, tunnelidt t)
2029 {
2030 uint8_t buf[MAXETHER];
2031 uint8_t *q;
2032
2033 CSTAT(sendipcp);
2034 LOG(3, s, t, "IPCP: send ConfigReq\n");
2035
2036 if (!session[s].unique_id)
2037 {
2038 if (!++last_id) ++last_id; // skip zero
2039 session[s].unique_id = last_id;
2040 }
2041
2042 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2043 if (!q) return;
2044
2045 *q = ConfigReq;
2046 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2047 *(uint16_t *) (q + 2) = htons(10); // packet length
2048 q[4] = 3; // ip address option
2049 q[5] = 6; // option length
2050 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2051 config->bind_address ? config->bind_address :
2052 my_address; // send my IP
2053
2054 tunnelsend(buf, 10 + (q - buf), t); // send it
2055 restart_timer(s, ipcp);
2056 }
2057
2058 void sendipv6cp(sessionidt s, tunnelidt t)
2059 {
2060 uint8_t buf[MAXETHER];
2061 uint8_t *q;
2062
2063 CSTAT(sendipv6cp);
2064 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2065
2066 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2067 if (!q) return;
2068
2069 *q = ConfigReq;
2070 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2071 // only send one type
2072 // of request
2073 *(uint16_t *) (q + 2) = htons(14);
2074 q[4] = 1; // interface identifier option
2075 q[5] = 10; // option length
2076 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2077 *(uint32_t *) (q + 10) = 0;
2078 q[13] = 1;
2079
2080 tunnelsend(buf, 14 + (q - buf), t); // send it
2081 restart_timer(s, ipv6cp);
2082 }
2083
2084 static void sessionclear(sessionidt s)
2085 {
2086 memset(&session[s], 0, sizeof(session[s]));
2087 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2088 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2089
2090 session[s].tunnel = T_FREE; // Mark it as free.
2091 session[s].next = sessionfree;
2092 sessionfree = s;
2093 }
2094
2095 // kill a session now
2096 void sessionkill(sessionidt s, char *reason)
2097 {
2098 CSTAT(sessionkill);
2099
2100 if (!session[s].opened) // not alive
2101 return;
2102
2103 if (session[s].next)
2104 {
2105 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2106 return;
2107 }
2108
2109 if (!session[s].die)
2110 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2111
2112 if (sess_local[s].radius)
2113 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2114
2115 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2116 sessionclear(s);
2117 cluster_send_session(s);
2118 }
2119
2120 static void tunnelclear(tunnelidt t)
2121 {
2122 if (!t) return;
2123 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2124 tunnel[t].state = TUNNELFREE;
2125 }
2126
2127 static void bundleclear(bundleidt b)
2128 {
2129 if (!b) return;
2130 memset(&bundle[b], 0, sizeof(bundle[b]));
2131 bundle[b].state = BUNDLEFREE;
2132 }
2133
2134 // kill a tunnel now
2135 static void tunnelkill(tunnelidt t, char *reason)
2136 {
2137 sessionidt s;
2138 controlt *c;
2139
2140 CSTAT(tunnelkill);
2141
2142 tunnel[t].state = TUNNELDIE;
2143
2144 // free control messages
2145 while ((c = tunnel[t].controls))
2146 {
2147 controlt * n = c->next;
2148 tunnel[t].controls = n;
2149 tunnel[t].controlc--;
2150 c->next = controlfree;
2151 controlfree = c;
2152 }
2153 // kill sessions
2154 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2155 if (session[s].tunnel == t)
2156 sessionkill(s, reason);
2157
2158 // free tunnel
2159 tunnelclear(t);
2160 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2161 cli_tunnel_actions[t].action = 0;
2162 cluster_send_tunnel(t);
2163 }
2164
2165 // shut down a tunnel cleanly
2166 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2167 {
2168 sessionidt s;
2169
2170 CSTAT(tunnelshutdown);
2171
2172 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2173 {
2174 // never set up, can immediately kill
2175 tunnelkill(t, reason);
2176 return;
2177 }
2178 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2179
2180 // close session
2181 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2182 if (session[s].tunnel == t)
2183 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2184
2185 tunnel[t].state = TUNNELDIE;
2186 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2187 cluster_send_tunnel(t);
2188 // TBA - should we wait for sessions to stop?
2189 if (result)
2190 {
2191 controlt *c = controlnew(4); // sending StopCCN
2192 if (error)
2193 {
2194 uint8_t buf[64];
2195 int l = 4;
2196 *(uint16_t *) buf = htons(result);
2197 *(uint16_t *) (buf+2) = htons(error);
2198 if (msg)
2199 {
2200 int m = strlen(msg);
2201 if (m + 4 > sizeof(buf))
2202 m = sizeof(buf) - 4;
2203
2204 memcpy(buf+4, msg, m);
2205 l += m;
2206 }
2207
2208 controlb(c, 1, buf, l, 1);
2209 }
2210 else
2211 control16(c, 1, result, 1);
2212
2213 control16(c, 9, t, 1); // assigned tunnel (our end)
2214 controladd(c, 0, t); // send the message
2215 }
2216 }
2217
2218 // read and process packet on tunnel (UDP)
2219 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2220 {
2221 uint8_t *chapresponse = NULL;
2222 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2223 uint8_t *p = buf + 2;
2224
2225
2226 CSTAT(processudp);
2227
2228 udp_rx += len;
2229 udp_rx_pkt++;
2230 LOG_HEX(5, "UDP Data", buf, len);
2231 STAT(tunnel_rx_packets);
2232 INC_STAT(tunnel_rx_bytes, len);
2233 if (len < 6)
2234 {
2235 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2236 STAT(tunnel_rx_errors);
2237 return;
2238 }
2239 if ((buf[1] & 0x0F) != 2)
2240 {
2241 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2242 STAT(tunnel_rx_errors);
2243 return;
2244 }
2245 if (*buf & 0x40)
2246 { // length
2247 l = ntohs(*(uint16_t *) p);
2248 p += 2;
2249 }
2250 t = ntohs(*(uint16_t *) p);
2251 p += 2;
2252 s = ntohs(*(uint16_t *) p);
2253 p += 2;
2254 if (s >= MAXSESSION)
2255 {
2256 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2257 STAT(tunnel_rx_errors);
2258 return;
2259 }
2260 if (t >= MAXTUNNEL)
2261 {
2262 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2263 STAT(tunnel_rx_errors);
2264 return;
2265 }
2266 if (*buf & 0x08)
2267 { // ns/nr
2268 ns = ntohs(*(uint16_t *) p);
2269 p += 2;
2270 nr = ntohs(*(uint16_t *) p);
2271 p += 2;
2272 }
2273 if (*buf & 0x02)
2274 { // offset
2275 uint16_t o = ntohs(*(uint16_t *) p);
2276 p += o + 2;
2277 }
2278 if ((p - buf) > l)
2279 {
2280 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2281 STAT(tunnel_rx_errors);
2282 return;
2283 }
2284 l -= (p - buf);
2285
2286 // used to time out old tunnels
2287 if (t && tunnel[t].state == TUNNELOPEN)
2288 tunnel[t].lastrec = time_now;
2289
2290 if (*buf & 0x80)
2291 { // control
2292 uint16_t message = 0xFFFF; // message type
2293 uint8_t fatal = 0;
2294 uint8_t mandatory = 0;
2295 uint16_t asession = 0; // assigned session
2296 uint32_t amagic = 0; // magic number
2297 uint8_t aflags = 0; // flags from last LCF
2298 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2299 char called[MAXTEL] = ""; // called number
2300 char calling[MAXTEL] = ""; // calling number
2301
2302 if (!config->cluster_iam_master)
2303 {
2304 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2305 return;
2306 }
2307
2308 // control messages must have bits 0x80|0x40|0x08
2309 // (type, length and sequence) set, and bits 0x02|0x01
2310 // (offset and priority) clear
2311 if ((*buf & 0xCB) != 0xC8)
2312 {
2313 LOG(1, s, t, "Bad control header %02X\n", *buf);
2314 STAT(tunnel_rx_errors);
2315 return;
2316 }
2317
2318 // check for duplicate tunnel open message
2319 if (!t && ns == 0)
2320 {
2321 int i;
2322
2323 //
2324 // Is this a duplicate of the first packet? (SCCRQ)
2325 //
2326 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2327 {
2328 if (tunnel[i].state != TUNNELOPENING ||
2329 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2330 tunnel[i].port != ntohs(addr->sin_port) )
2331 continue;
2332 t = i;
2333 LOG(3, s, t, "Duplicate SCCRQ?\n");
2334 break;
2335 }
2336 }
2337
2338 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2339 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2340
2341 // if no tunnel specified, assign one
2342 if (!t)
2343 {
2344 if (!(t = new_tunnel()))
2345 {
2346 LOG(1, 0, 0, "No more tunnels\n");
2347 STAT(tunnel_overflow);
2348 return;
2349 }
2350 tunnelclear(t);
2351 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2352 tunnel[t].port = ntohs(addr->sin_port);
2353 tunnel[t].window = 4; // default window
2354 STAT(tunnel_created);
2355 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2356 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2357 }
2358
2359 // If the 'ns' just received is not the 'nr' we're
2360 // expecting, just send an ack and drop it.
2361 //
2362 // if 'ns' is less, then we got a retransmitted packet.
2363 // if 'ns' is greater than missed a packet. Either way
2364 // we should ignore it.
2365 if (ns != tunnel[t].nr)
2366 {
2367 // is this the sequence we were expecting?
2368 STAT(tunnel_rx_errors);
2369 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2370 t, ns, tunnel[t].nr);
2371
2372 if (l) // Is this not a ZLB?
2373 controlnull(t);
2374 return;
2375 }
2376
2377 // check sequence of this message
2378 {
2379 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2380 // some to clear maybe?
2381 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2382 {
2383 controlt *c = tunnel[t].controls;
2384 tunnel[t].controls = c->next;
2385 tunnel[t].controlc--;
2386 c->next = controlfree;
2387 controlfree = c;
2388 skip--;
2389 tunnel[t].try = 0; // we have progress
2390 }
2391
2392 // receiver advance (do here so quoted correctly in any sends below)
2393 if (l) tunnel[t].nr = (ns + 1);
2394 if (skip < 0) skip = 0;
2395 if (skip < tunnel[t].controlc)
2396 {
2397 // some control packets can now be sent that were previous stuck out of window
2398 int tosend = tunnel[t].window - skip;
2399 controlt *c = tunnel[t].controls;
2400 while (c && skip)
2401 {
2402 c = c->next;
2403 skip--;
2404 }
2405 while (c && tosend)
2406 {
2407 tunnel[t].try = 0; // first send
2408 tunnelsend(c->buf, c->length, t);
2409 c = c->next;
2410 tosend--;
2411 }
2412 }
2413 if (!tunnel[t].controlc)
2414 tunnel[t].retry = 0; // caught up
2415 }
2416 if (l)
2417 { // if not a null message
2418 int result = 0;
2419 int error = 0;
2420 char *msg = 0;
2421
2422 // Default disconnect cause/message on receipt of CDN. Set to
2423 // more specific value from attribute 1 (result code) or 46
2424 // (disconnect cause) if present below.
2425 int disc_cause_set = 0;
2426 int disc_cause = TERM_NAS_REQUEST;
2427 char const *disc_reason = "Closed (Received CDN).";
2428
2429 // process AVPs
2430 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2431 {
2432 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2433 uint8_t *b = p;
2434 uint8_t flags = *p;
2435 uint16_t mtype;
2436
2437 if (n > l)
2438 {
2439 LOG(1, s, t, "Invalid length in AVP\n");
2440 STAT(tunnel_rx_errors);
2441 return;
2442 }
2443 p += n; // next
2444 l -= n;
2445 if (flags & 0x3C) // reserved bits, should be clear
2446 {
2447 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2448 fatal = flags;
2449 result = 2; // general error
2450 error = 3; // reserved field non-zero
2451 msg = 0;
2452 continue; // next
2453 }
2454 b += 2;
2455 if (*(uint16_t *) (b))
2456 {
2457 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2458 fatal = flags;
2459 result = 2; // general error
2460 error = 6; // generic vendor-specific error
2461 msg = "unsupported vendor-specific";
2462 continue; // next
2463 }
2464 b += 2;
2465 mtype = ntohs(*(uint16_t *) (b));
2466 b += 2;
2467 n -= 6;
2468
2469 if (flags & 0x40)
2470 {
2471 uint16_t orig_len;
2472
2473 // handle hidden AVPs
2474 if (!*config->l2tp_secret)
2475 {
2476 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2477 fatal = flags;
2478 result = 2; // general error
2479 error = 6; // generic vendor-specific error
2480 msg = "secret not specified";
2481 continue;
2482 }
2483 if (!session[s].random_vector_length)
2484 {
2485 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2486 fatal = flags;
2487 result = 2; // general error
2488 error = 6; // generic
2489 msg = "no random vector";
2490 continue;
2491 }
2492 if (n < 8)
2493 {
2494 LOG(2, s, t, "Short hidden AVP.\n");
2495 fatal = flags;
2496 result = 2; // general error
2497 error = 2; // length is wrong
2498 msg = 0;
2499 continue;
2500 }
2501
2502 // Unhide the AVP
2503 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2504
2505 orig_len = ntohs(*(uint16_t *) b);
2506 if (orig_len > n + 2)
2507 {
2508 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2509 orig_len, n);
2510
2511 fatal = flags;
2512 result = 2; // general error
2513 error = 2; // length is wrong
2514 msg = 0;
2515 continue;
2516 }
2517
2518 b += 2;
2519 n = orig_len;
2520 }
2521
2522 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2523 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2524
2525 switch (mtype)
2526 {
2527 case 0: // message type
2528 message = ntohs(*(uint16_t *) b);
2529 mandatory = flags & 0x80;
2530 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2531 break;
2532 case 1: // result code
2533 {
2534 uint16_t rescode = ntohs(*(uint16_t *) b);
2535 char const *resdesc = "(unknown)";
2536 char const *errdesc = NULL;
2537 int cause = 0;
2538
2539 if (message == 4)
2540 { /* StopCCN */
2541 resdesc = l2tp_stopccn_result_code(rescode);
2542 cause = TERM_LOST_SERVICE;
2543 }
2544 else if (message == 14)
2545 { /* CDN */
2546 resdesc = l2tp_cdn_result_code(rescode);
2547 if (rescode == 1)
2548 cause = TERM_LOST_CARRIER;
2549 else
2550 cause = TERM_ADMIN_RESET;
2551 }
2552
2553 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2554 if (n >= 4)
2555 {
2556 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2557 errdesc = l2tp_error_code(errcode);
2558 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2559 }
2560 if (n > 4)
2561 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2562
2563 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2564 {
2565 disc_cause_set = mtype;
2566 disc_reason = errdesc ? errdesc : resdesc;
2567 disc_cause = cause;
2568 }
2569
2570 break;
2571 }
2572 break;
2573 case 2: // protocol version
2574 {
2575 version = ntohs(*(uint16_t *) (b));
2576 LOG(4, s, t, " Protocol version = %u\n", version);
2577 if (version && version != 0x0100)
2578 { // allow 0.0 and 1.0
2579 LOG(1, s, t, " Bad protocol version %04X\n", version);
2580 fatal = flags;
2581 result = 5; // unspported protocol version
2582 error = 0x0100; // supported version
2583 msg = 0;
2584 continue; // next
2585 }
2586 }
2587 break;
2588 case 3: // framing capabilities
2589 break;
2590 case 4: // bearer capabilities
2591 break;
2592 case 5: // tie breaker
2593 // We never open tunnels, so we don't care about tie breakers
2594 continue;
2595 case 6: // firmware revision
2596 break;
2597 case 7: // host name
2598 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2599 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2600 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2601 // TBA - to send to RADIUS
2602 break;
2603 case 8: // vendor name
2604 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2605 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2606 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2607 break;
2608 case 9: // assigned tunnel
2609 tunnel[t].far = ntohs(*(uint16_t *) (b));
2610 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2611 break;
2612 case 10: // rx window
2613 tunnel[t].window = ntohs(*(uint16_t *) (b));
2614 if (!tunnel[t].window)
2615 tunnel[t].window = 1; // window of 0 is silly
2616 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2617 break;
2618 case 11: // Challenge
2619 {
2620 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2621 build_chap_response(b, 2, n, &chapresponse);
2622 }
2623 break;
2624 case 13: // Response
2625 // Why did they send a response? We never challenge.
2626 LOG(2, s, t, " received unexpected challenge response\n");
2627 break;
2628
2629 case 14: // assigned session
2630 asession = session[s].far = ntohs(*(uint16_t *) (b));
2631 LOG(4, s, t, " assigned session = %u\n", asession);
2632 break;
2633 case 15: // call serial number
2634 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2635 break;
2636 case 18: // bearer type
2637 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2638 // TBA - for RADIUS
2639 break;
2640 case 19: // framing type
2641 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2642 // TBA
2643 break;
2644 case 21: // called number
2645 memset(called, 0, sizeof(called));
2646 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2647 LOG(4, s, t, " Called <%s>\n", called);
2648 break;
2649 case 22: // calling number
2650 memset(calling, 0, sizeof(calling));
2651 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2652 LOG(4, s, t, " Calling <%s>\n", calling);
2653 break;
2654 case 23: // subtype
2655 break;
2656 case 24: // tx connect speed
2657 if (n == 4)
2658 {
2659 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2660 }
2661 else
2662 {
2663 // AS5300s send connect speed as a string
2664 char tmp[30];
2665 memset(tmp, 0, sizeof(tmp));
2666 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2667 session[s].tx_connect_speed = atol(tmp);
2668 }
2669 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2670 break;
2671 case 38: // rx connect speed
2672 if (n == 4)
2673 {
2674 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2675 }
2676 else
2677 {
2678 // AS5300s send connect speed as a string
2679 char tmp[30];
2680 memset(tmp, 0, sizeof(tmp));
2681 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2682 session[s].rx_connect_speed = atol(tmp);
2683 }
2684 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2685 break;
2686 case 25: // Physical Channel ID
2687 {
2688 uint32_t tmp = ntohl(*(uint32_t *) b);
2689 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2690 break;
2691 }
2692 case 29: // Proxy Authentication Type
2693 {
2694 uint16_t atype = ntohs(*(uint16_t *)b);
2695 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2696 break;
2697 }
2698 case 30: // Proxy Authentication Name
2699 {
2700 char authname[64];
2701 memset(authname, 0, sizeof(authname));
2702 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2703 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2704 authname);
2705 break;
2706 }
2707 case 31: // Proxy Authentication Challenge
2708 {
2709 LOG(4, s, t, " Proxy Auth Challenge\n");
2710 break;
2711 }
2712 case 32: // Proxy Authentication ID
2713 {
2714 uint16_t authid = ntohs(*(uint16_t *)(b));
2715 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2716 break;
2717 }
2718 case 33: // Proxy Authentication Response
2719 LOG(4, s, t, " Proxy Auth Response\n");
2720 break;
2721 case 27: // last sent lcp
2722 { // find magic number
2723 uint8_t *p = b, *e = p + n;
2724 while (p + 1 < e && p[1] && p + p[1] <= e)
2725 {
2726 if (*p == 5 && p[1] == 6) // Magic-Number
2727 amagic = ntohl(*(uint32_t *) (p + 2));
2728 else if (*p == 7) // Protocol-Field-Compression
2729 aflags |= SESSION_PFC;
2730 else if (*p == 8) // Address-and-Control-Field-Compression
2731 aflags |= SESSION_ACFC;
2732 p += p[1];
2733 }
2734 }
2735 break;
2736 case 28: // last recv lcp confreq
2737 break;
2738 case 26: // Initial Received LCP CONFREQ
2739 break;
2740 case 39: // seq required - we control it as an LNS anyway...
2741 break;
2742 case 36: // Random Vector
2743 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2744 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2745 if (n > sizeof(session[s].random_vector))
2746 n = sizeof(session[s].random_vector);
2747 memcpy(session[s].random_vector, b, n);
2748 session[s].random_vector_length = n;
2749 break;
2750 case 46: // ppp disconnect cause
2751 if (n >= 5)
2752 {
2753 uint16_t code = ntohs(*(uint16_t *) b);
2754 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2755 uint8_t dir = *(b + 4);
2756
2757 LOG(4, s, t, " PPP disconnect cause "
2758 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2759 code, proto, dir, n - 5, b + 5);
2760
2761 disc_cause_set = mtype;
2762
2763 switch (code)
2764 {
2765 case 1: // admin disconnect
2766 disc_cause = TERM_ADMIN_RESET;
2767 disc_reason = "Administrative disconnect";
2768 break;
2769 case 3: // lcp terminate
2770 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2771 disc_cause = TERM_USER_REQUEST;
2772 disc_reason = "Normal disconnection";
2773 break;
2774 case 4: // compulsory encryption unavailable
2775 if (dir != 1) break; // 1=refused by peer, 2=local
2776 disc_cause = TERM_USER_ERROR;
2777 disc_reason = "Compulsory encryption refused";
2778 break;
2779 case 5: // lcp: fsm timeout
2780 disc_cause = TERM_PORT_ERROR;
2781 disc_reason = "LCP: FSM timeout";
2782 break;
2783 case 6: // lcp: no recognisable lcp packets received
2784 disc_cause = TERM_PORT_ERROR;
2785 disc_reason = "LCP: no recognisable LCP packets";
2786 break;
2787 case 7: // lcp: magic-no error (possibly looped back)
2788 disc_cause = TERM_PORT_ERROR;
2789 disc_reason = "LCP: magic-no error (possible loop)";
2790 break;
2791 case 8: // lcp: echo request timeout
2792 disc_cause = TERM_PORT_ERROR;
2793 disc_reason = "LCP: echo request timeout";
2794 break;
2795 case 13: // auth: fsm timeout
2796 disc_cause = TERM_SERVICE_UNAVAILABLE;
2797 disc_reason = "Authentication: FSM timeout";
2798 break;
2799 case 15: // auth: unacceptable auth protocol
2800 disc_cause = TERM_SERVICE_UNAVAILABLE;
2801 disc_reason = "Unacceptable authentication protocol";
2802 break;
2803 case 16: // auth: authentication failed
2804 disc_cause = TERM_SERVICE_UNAVAILABLE;
2805 disc_reason = "Authentication failed";
2806 break;
2807 case 17: // ncp: fsm timeout
2808 disc_cause = TERM_SERVICE_UNAVAILABLE;
2809 disc_reason = "NCP: FSM timeout";
2810 break;
2811 case 18: // ncp: no ncps available
2812 disc_cause = TERM_SERVICE_UNAVAILABLE;
2813 disc_reason = "NCP: no NCPs available";
2814 break;
2815 case 19: // ncp: failure to converge on acceptable address
2816 disc_cause = TERM_SERVICE_UNAVAILABLE;
2817 disc_reason = (dir == 1)
2818 ? "NCP: too many Configure-Naks received from peer"
2819 : "NCP: too many Configure-Naks sent to peer";
2820 break;
2821 case 20: // ncp: user not permitted to use any address
2822 disc_cause = TERM_SERVICE_UNAVAILABLE;
2823 disc_reason = (dir == 1)
2824 ? "NCP: local link address not acceptable to peer"
2825 : "NCP: remote link address not acceptable";
2826 break;
2827 }
2828 }
2829 break;
2830 default:
2831 {
2832 static char e[] = "unknown AVP 0xXXXX";
2833 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2834 fatal = flags;
2835 result = 2; // general error
2836 error = 8; // unknown mandatory AVP
2837 sprintf((msg = e) + 14, "%04x", mtype);
2838 continue; // next
2839 }
2840 }
2841 }
2842 // process message
2843 if (fatal & 0x80)
2844 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2845 else
2846 switch (message)
2847 {
2848 case 1: // SCCRQ - Start Control Connection Request
2849 tunnel[t].state = TUNNELOPENING;
2850 if (main_quit != QUIT_SHUTDOWN)
2851 {
2852 controlt *c = controlnew(2); // sending SCCRP
2853 control16(c, 2, version, 1); // protocol version
2854 control32(c, 3, 3, 1); // framing
2855 controls(c, 7, hostname, 1); // host name
2856 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2857 control16(c, 9, t, 1); // assigned tunnel
2858 controladd(c, 0, t); // send the resply
2859 }
2860 else
2861 {
2862 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2863 }
2864 break;
2865 case 2: // SCCRP
2866 tunnel[t].state = TUNNELOPEN;
2867 tunnel[t].lastrec = time_now;
2868 break;
2869 case 3: // SCCN
2870 tunnel[t].state = TUNNELOPEN;
2871 tunnel[t].lastrec = time_now;
2872 controlnull(t); // ack
2873 break;
2874 case 4: // StopCCN
2875 controlnull(t); // ack
2876 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2877 break;
2878 case 6: // HELLO
2879 controlnull(t); // simply ACK
2880 break;
2881 case 7: // OCRQ
2882 // TBA
2883 break;
2884 case 8: // OCRO
2885 // TBA
2886 break;
2887 case 9: // OCCN
2888 // TBA
2889 break;
2890 case 10: // ICRQ
2891 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2892 {
2893 controlt *c = controlnew(11); // ICRP
2894
2895 s = sessionfree;
2896 sessionfree = session[s].next;
2897 memset(&session[s], 0, sizeof(session[s]));
2898
2899 if (s > config->cluster_highest_sessionid)
2900 config->cluster_highest_sessionid = s;
2901
2902 session[s].opened = time_now;
2903 session[s].tunnel = t;
2904 session[s].far = asession;
2905 session[s].last_packet = session[s].last_data = time_now;
2906 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2907 control16(c, 14, s, 1); // assigned session
2908 controladd(c, asession, t); // send the reply
2909
2910 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2911 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2912
2913 session[s].ppp.phase = Establish;
2914 session[s].ppp.lcp = Starting;
2915
2916 STAT(session_created);
2917 break;
2918 }
2919
2920 {
2921 controlt *c = controlnew(14); // CDN
2922 if (!sessionfree)
2923 {
2924 STAT(session_overflow);
2925 LOG(1, 0, t, "No free sessions\n");
2926 control16(c, 1, 4, 0); // temporary lack of resources
2927 }
2928 else
2929 control16(c, 1, 2, 7); // shutting down, try another
2930
2931 controladd(c, asession, t); // send the message
2932 }
2933 return;
2934 case 11: // ICRP
2935 // TBA
2936 break;
2937 case 12: // ICCN
2938 if (amagic == 0) amagic = time_now;
2939 session[s].magic = amagic; // set magic number
2940 session[s].flags = aflags; // set flags received
2941 session[s].mru = PPPoE_MRU; // default
2942 controlnull(t); // ack
2943
2944 // start LCP
2945 sess_local[s].lcp_authtype = config->radius_authprefer;
2946 sess_local[s].ppp_mru = MRU;
2947
2948 // Set multilink options before sending initial LCP packet
2949 sess_local[s].mp_mrru = 1614;
2950 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2951
2952 sendlcp(s, t);
2953 change_state(s, lcp, RequestSent);
2954 break;
2955
2956 case 14: // CDN
2957 controlnull(t); // ack
2958 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2959 break;
2960 case 0xFFFF:
2961 LOG(1, s, t, "Missing message type\n");
2962 break;
2963 default:
2964 STAT(tunnel_rx_errors);
2965 if (mandatory)
2966 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2967 else
2968 LOG(1, s, t, "Unknown message type %u\n", message);
2969 break;
2970 }
2971 if (chapresponse) free(chapresponse);
2972 cluster_send_tunnel(t);
2973 }
2974 else
2975 {
2976 LOG(4, s, t, " Got a ZLB ack\n");
2977 }
2978 }
2979 else
2980 { // data
2981 uint16_t proto;
2982
2983 LOG_HEX(5, "Receive Tunnel Data", p, l);
2984 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2985 { // HDLC address header, discard
2986 p += 2;
2987 l -= 2;
2988 }
2989 if (l < 2)
2990 {
2991 LOG(1, s, t, "Short ppp length %d\n", l);
2992 STAT(tunnel_rx_errors);
2993 return;
2994 }
2995 if (*p & 1)
2996 {
2997 proto = *p++;
2998 l--;
2999 }
3000 else
3001 {
3002 proto = ntohs(*(uint16_t *) p);
3003 p += 2;
3004 l -= 2;
3005 }
3006
3007 if (s && !session[s].opened) // Is something wrong??
3008 {
3009 if (!config->cluster_iam_master)
3010 {
3011 // Pass it off to the master to deal with..
3012 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3013 return;
3014 }
3015
3016
3017 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3018 STAT(tunnel_rx_errors);
3019 return;
3020 }
3021
3022 if (proto == PPPPAP)
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 processpap(s, t, p, l);
3027 }
3028 else if (proto == PPPCHAP)
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 processchap(s, t, p, l);
3033 }
3034 else if (proto == PPPLCP)
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 processlcp(s, t, p, l);
3039 }
3040 else if (proto == PPPIPCP)
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 processipcp(s, t, p, l);
3045 }
3046 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3047 {
3048 session[s].last_packet = time_now;
3049 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3050 processipv6cp(s, t, p, l);
3051 }
3052 else if (proto == PPPCCP)
3053 {
3054 session[s].last_packet = time_now;
3055 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3056 processccp(s, t, p, l);
3057 }
3058 else if (proto == PPPIP)
3059 {
3060 if (session[s].die)
3061 {
3062 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3063 return; // closing session, PPP not processed
3064 }
3065
3066 session[s].last_packet = session[s].last_data = time_now;
3067 if (session[s].walled_garden && !config->cluster_iam_master)
3068 {
3069 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3070 return;
3071 }
3072
3073 processipin(s, t, p, l);
3074 }
3075 else if (proto == PPPMP)
3076 {
3077 if (session[s].die)
3078 {
3079 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3080 return; // closing session, PPP not processed
3081 }
3082
3083 session[s].last_packet = session[s].last_data = time_now;
3084 if (session[s].walled_garden && !config->cluster_iam_master)
3085 {
3086 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3087 return;
3088 }
3089
3090 processmpin(s, t, p, l);
3091 }
3092 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3093 {
3094 if (session[s].die)
3095 {
3096 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3097 return; // closing session, PPP not processed
3098 }
3099
3100 session[s].last_packet = session[s].last_data = time_now;
3101 if (session[s].walled_garden && !config->cluster_iam_master)
3102 {
3103 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3104 return;
3105 }
3106
3107 processipv6in(s, t, p, l);
3108 }
3109 else if (session[s].ppp.lcp == Opened)
3110 {
3111 session[s].last_packet = time_now;
3112 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3113 protoreject(s, t, p, l, proto);
3114 }
3115 else
3116 {
3117 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3118 proto, ppp_state(session[s].ppp.lcp));
3119 }
3120 }
3121 }
3122
3123 // read and process packet on tun
3124 static void processtun(uint8_t * buf, int len)
3125 {
3126 LOG_HEX(5, "Receive TUN Data", buf, len);
3127 STAT(tun_rx_packets);
3128 INC_STAT(tun_rx_bytes, len);
3129
3130 CSTAT(processtun);
3131
3132 eth_rx_pkt++;
3133 eth_rx += len;
3134 if (len < 22)
3135 {
3136 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3137 STAT(tun_rx_errors);
3138 return;
3139 }
3140
3141 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3142 processipout(buf, len);
3143 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3144 && config->ipv6_prefix.s6_addr[0])
3145 processipv6out(buf, len);
3146
3147 // Else discard.
3148 }
3149
3150 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3151 // that we look at the whole of the tunnel, radius and session tables
3152 // every second
3153 static void regular_cleanups(double period)
3154 {
3155 // Next tunnel, radius and session to check for actions on.
3156 static tunnelidt t = 0;
3157 static int r = 0;
3158 static sessionidt s = 0;
3159
3160 int t_actions = 0;
3161 int r_actions = 0;
3162 int s_actions = 0;
3163
3164 int t_slice;
3165 int r_slice;
3166 int s_slice;
3167
3168 int i;
3169 int a;
3170
3171 // divide up tables into slices based on the last run
3172 t_slice = config->cluster_highest_tunnelid * period;
3173 r_slice = (MAXRADIUS - 1) * period;
3174 s_slice = config->cluster_highest_sessionid * period;
3175
3176 if (t_slice < 1)
3177 t_slice = 1;
3178 else if (t_slice > config->cluster_highest_tunnelid)
3179 t_slice = config->cluster_highest_tunnelid;
3180
3181 if (r_slice < 1)
3182 r_slice = 1;
3183 else if (r_slice > (MAXRADIUS - 1))
3184 r_slice = MAXRADIUS - 1;
3185
3186 if (s_slice < 1)
3187 s_slice = 1;
3188 else if (s_slice > config->cluster_highest_sessionid)
3189 s_slice = config->cluster_highest_sessionid;
3190
3191 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3192
3193 for (i = 0; i < t_slice; i++)
3194 {
3195 t++;
3196 if (t > config->cluster_highest_tunnelid)
3197 t = 1;
3198
3199 // check for expired tunnels
3200 if (tunnel[t].die && tunnel[t].die <= TIME)
3201 {
3202 STAT(tunnel_timeout);
3203 tunnelkill(t, "Expired");
3204 t_actions++;
3205 continue;
3206 }
3207 // check for message resend
3208 if (tunnel[t].retry && tunnel[t].controlc)
3209 {
3210 // resend pending messages as timeout on reply
3211 if (tunnel[t].retry <= TIME)
3212 {
3213 controlt *c = tunnel[t].controls;
3214 uint16_t w = tunnel[t].window;
3215 tunnel[t].try++; // another try
3216 if (tunnel[t].try > 5)
3217 tunnelkill(t, "Timeout on control message"); // game over
3218 else
3219 while (c && w--)
3220 {
3221 tunnelsend(c->buf, c->length, t);
3222 c = c->next;
3223 }
3224
3225 t_actions++;
3226 }
3227 }
3228 // Send hello
3229 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3230 {
3231 controlt *c = controlnew(6); // sending HELLO
3232 controladd(c, 0, t); // send the message
3233 LOG(3, 0, t, "Sending HELLO message\n");
3234 t_actions++;
3235 }
3236
3237 // Check for tunnel changes requested from the CLI
3238 if ((a = cli_tunnel_actions[t].action))
3239 {
3240 cli_tunnel_actions[t].action = 0;
3241 if (a & CLI_TUN_KILL)
3242 {
3243 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3244 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3245 t_actions++;
3246 }
3247 }
3248 }
3249
3250 for (i = 0; i < r_slice; i++)
3251 {
3252 r++;
3253 if (r >= MAXRADIUS)
3254 r = 1;
3255
3256 if (!radius[r].state)
3257 continue;
3258
3259 if (radius[r].retry <= TIME)
3260 {
3261 radiusretry(r);
3262 r_actions++;
3263 }
3264 }
3265
3266 for (i = 0; i < s_slice; i++)
3267 {
3268 s++;
3269 if (s > config->cluster_highest_sessionid)
3270 s = 1;
3271
3272 if (!session[s].opened) // Session isn't in use
3273 continue;
3274
3275 // check for expired sessions
3276 if (session[s].die)
3277 {
3278 if (session[s].die <= TIME)
3279 {
3280 sessionkill(s, "Expired");
3281 s_actions++;
3282 }
3283 continue;
3284 }
3285
3286 // PPP timeouts
3287 if (sess_local[s].lcp.restart <= time_now)
3288 {
3289 int next_state = session[s].ppp.lcp;
3290 switch (session[s].ppp.lcp)
3291 {
3292 case RequestSent:
3293 case AckReceived:
3294 next_state = RequestSent;
3295
3296 case AckSent:
3297 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3298 {
3299 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3300 sendlcp(s, session[s].tunnel);
3301 change_state(s, lcp, next_state);
3302 }
3303 else
3304 {
3305 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3306 STAT(session_timeout);
3307 }
3308
3309 s_actions++;
3310 }
3311
3312 if (session[s].die)
3313 continue;
3314 }
3315
3316 if (sess_local[s].ipcp.restart <= time_now)
3317 {
3318 int next_state = session[s].ppp.ipcp;
3319 switch (session[s].ppp.ipcp)
3320 {
3321 case RequestSent:
3322 case AckReceived:
3323 next_state = RequestSent;
3324
3325 case AckSent:
3326 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3327 {
3328 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3329 sendipcp(s, session[s].tunnel);
3330 change_state(s, ipcp, next_state);
3331 }
3332 else
3333 {
3334 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3335 STAT(session_timeout);
3336 }
3337
3338 s_actions++;
3339 }
3340
3341 if (session[s].die)
3342 continue;
3343 }
3344
3345 if (sess_local[s].ipv6cp.restart <= time_now)
3346 {
3347 int next_state = session[s].ppp.ipv6cp;
3348 switch (session[s].ppp.ipv6cp)
3349 {
3350 case RequestSent:
3351 case AckReceived:
3352 next_state = RequestSent;
3353
3354 case AckSent:
3355 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3356 {
3357 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3358 sendipv6cp(s, session[s].tunnel);
3359 change_state(s, ipv6cp, next_state);
3360 }
3361 else
3362 {
3363 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3364 change_state(s, ipv6cp, Stopped);
3365 }
3366
3367 s_actions++;
3368 }
3369 }
3370
3371 if (sess_local[s].ccp.restart <= time_now)
3372 {
3373 int next_state = session[s].ppp.ccp;
3374 switch (session[s].ppp.ccp)
3375 {
3376 case RequestSent:
3377 case AckReceived:
3378 next_state = RequestSent;
3379
3380 case AckSent:
3381 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3382 {
3383 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3384 sendccp(s, session[s].tunnel);
3385 change_state(s, ccp, next_state);
3386 }
3387 else
3388 {
3389 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3390 change_state(s, ccp, Stopped);
3391 }
3392
3393 s_actions++;
3394 }
3395 }
3396
3397 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3398 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3399 {
3400 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3401 STAT(session_timeout);
3402 s_actions++;
3403 continue;
3404 }
3405
3406 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3407 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3408 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3409 {
3410 uint8_t b[MAXETHER];
3411
3412 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3413 if (!q) continue;
3414
3415 *q = EchoReq;
3416 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3417 *(uint16_t *)(q + 2) = htons(8); // Length
3418 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3419
3420 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3421 (int)(time_now - session[s].last_packet));
3422 tunnelsend(b, 24, session[s].tunnel); // send it
3423 sess_local[s].last_echo = time_now;
3424 s_actions++;
3425 }
3426
3427 // Drop sessions who have reached session_timeout seconds
3428 if (session[s].session_timeout)
3429 {
3430 bundleidt bid = session[s].bundle;
3431 if (bid)
3432 {
3433 if (time_now - bundle[bid].last_check >= 1)
3434 {
3435 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3436 bundle[bid].last_check = time_now;
3437 if (bundle[bid].online_time >= session[s].session_timeout)
3438 {
3439 int ses;
3440 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3441 {
3442 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3443 s_actions++;
3444 continue;
3445 }
3446 }
3447 }
3448 }
3449 else if (time_now - session[s].opened >= session[s].session_timeout)
3450 {
3451 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3452 s_actions++;
3453 continue;
3454 }
3455 }
3456
3457 // Drop sessions who have reached idle_timeout seconds
3458 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3459 {
3460 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3461 STAT(session_timeout);
3462 s_actions++;
3463 continue;
3464 }
3465
3466 // Check for actions requested from the CLI
3467 if ((a = cli_session_actions[s].action))
3468 {
3469 int send = 0;
3470
3471 cli_session_actions[s].action = 0;
3472 if (a & CLI_SESS_KILL)
3473 {
3474 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3475 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3476 a = 0; // dead, no need to check for other actions
3477 s_actions++;
3478 }
3479
3480 if (a & CLI_SESS_NOSNOOP)
3481 {
3482 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3483 session[s].snoop_ip = 0;
3484 session[s].snoop_port = 0;
3485 s_actions++;
3486 send++;
3487 }
3488 else if (a & CLI_SESS_SNOOP)
3489 {
3490 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3491 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3492 cli_session_actions[s].snoop_port);
3493
3494 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3495 session[s].snoop_port = cli_session_actions[s].snoop_port;
3496 s_actions++;
3497 send++;
3498 }
3499
3500 if (a & CLI_SESS_NOTHROTTLE)
3501 {
3502 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3503 throttle_session(s, 0, 0);
3504 s_actions++;
3505 send++;
3506 }
3507 else if (a & CLI_SESS_THROTTLE)
3508 {
3509 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3510 cli_session_actions[s].throttle_in,
3511 cli_session_actions[s].throttle_out);
3512
3513 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3514 s_actions++;
3515 send++;
3516 }
3517
3518 if (a & CLI_SESS_NOFILTER)
3519 {
3520 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3521 filter_session(s, 0, 0);
3522 s_actions++;
3523 send++;
3524 }
3525 else if (a & CLI_SESS_FILTER)
3526 {
3527 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3528 cli_session_actions[s].filter_in,
3529 cli_session_actions[s].filter_out);
3530
3531 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3532 s_actions++;
3533 send++;
3534 }
3535
3536 if (send)
3537 cluster_send_session(s);
3538 }
3539
3540 // RADIUS interim accounting
3541 if (config->radius_accounting && config->radius_interim > 0
3542 && session[s].ip && !session[s].walled_garden
3543 && !sess_local[s].radius // RADIUS already in progress
3544 && time_now - sess_local[s].last_interim >= config->radius_interim
3545 && session[s].flags & SESSION_STARTED)
3546 {
3547 int rad = radiusnew(s);
3548 if (!rad)
3549 {
3550 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3551 STAT(radius_overflow);
3552 continue;
3553 }
3554
3555 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3556 session[s].user, session[s].unique_id);
3557
3558 radiussend(rad, RADIUSINTERIM);
3559 sess_local[s].last_interim = time_now;
3560 s_actions++;
3561 }
3562 }
3563
3564 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3565 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3566 }
3567
3568 //
3569 // Are we in the middle of a tunnel update, or radius
3570 // requests??
3571 //
3572 static int still_busy(void)
3573 {
3574 int i;
3575 static clockt last_talked = 0;
3576 static clockt start_busy_wait = 0;
3577
3578 if (!config->cluster_iam_master)
3579 {
3580 #ifdef BGP
3581 static time_t stopped_bgp = 0;
3582 if (bgp_configured)
3583 {
3584 if (!stopped_bgp)
3585 {
3586 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3587
3588 for (i = 0; i < BGP_NUM_PEERS; i++)
3589 if (bgp_peers[i].state == Established)
3590 bgp_stop(&bgp_peers[i]);
3591
3592 stopped_bgp = time_now;
3593
3594 // we don't want to become master
3595 cluster_send_ping(0);
3596
3597 return 1;
3598 }
3599
3600 if (time_now < (stopped_bgp + QUIT_DELAY))
3601 return 1;
3602 }
3603 #endif /* BGP */
3604
3605 return 0;
3606 }
3607
3608 if (main_quit == QUIT_SHUTDOWN)
3609 {
3610 static int dropped = 0;
3611 if (!dropped)
3612 {
3613 int i;
3614
3615 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3616 for (i = 1; i < MAXTUNNEL; i++)
3617 if (tunnel[i].ip || tunnel[i].state)
3618 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3619
3620 dropped = 1;
3621 }
3622 }
3623
3624 if (start_busy_wait == 0)
3625 start_busy_wait = TIME;
3626
3627 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3628 {
3629 if (!tunnel[i].controlc)
3630 continue;
3631
3632 if (last_talked != TIME)
3633 {
3634 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3635 last_talked = TIME;
3636 }
3637 return 1;
3638 }
3639
3640 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3641 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3642 {
3643 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3644 return 0;
3645 }
3646
3647 for (i = 1; i < MAXRADIUS; i++)
3648 {
3649 if (radius[i].state == RADIUSNULL)
3650 continue;
3651 if (radius[i].state == RADIUSWAIT)
3652 continue;
3653
3654 if (last_talked != TIME)
3655 {
3656 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3657 last_talked = TIME;
3658 }
3659 return 1;
3660 }
3661
3662 return 0;
3663 }
3664
3665 #ifdef HAVE_EPOLL
3666 # include <sys/epoll.h>
3667 #else
3668 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3669 # include "fake_epoll.h"
3670 #endif
3671
3672 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3673 #define BASE_FDS 6
3674
3675 // additional polled fds
3676 #ifdef BGP
3677 # define EXTRA_FDS BGP_NUM_PEERS
3678 #else
3679 # define EXTRA_FDS 0
3680 #endif
3681
3682 // main loop - gets packets on tun or udp and processes them
3683 static void mainloop(void)
3684 {
3685 int i;
3686 uint8_t buf[65536];
3687 clockt next_cluster_ping = 0; // send initial ping immediately
3688 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3689 int maxevent = sizeof(events)/sizeof(*events);
3690
3691 if ((epollfd = epoll_create(maxevent)) < 0)
3692 {
3693 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3694 exit(1);
3695 }
3696
3697 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3698 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
3699
3700 /* setup our fds to poll for input */
3701 {
3702 static struct event_data d[BASE_FDS];
3703 struct epoll_event e;
3704
3705 e.events = EPOLLIN;
3706 i = 0;
3707
3708 if (clifd >= 0)
3709 {
3710 d[i].type = FD_TYPE_CLI;
3711 e.data.ptr = &d[i++];
3712 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3713 }
3714
3715 d[i].type = FD_TYPE_CLUSTER;
3716 e.data.ptr = &d[i++];
3717 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3718
3719 d[i].type = FD_TYPE_TUN;
3720 e.data.ptr = &d[i++];
3721 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3722
3723 d[i].type = FD_TYPE_UDP;
3724 e.data.ptr = &d[i++];
3725 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3726
3727 d[i].type = FD_TYPE_CONTROL;
3728 e.data.ptr = &d[i++];
3729 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3730
3731 d[i].type = FD_TYPE_DAE;
3732 e.data.ptr = &d[i++];
3733 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3734 }
3735
3736 #ifdef BGP
3737 signal(SIGPIPE, SIG_IGN);
3738 bgp_setup(config->as_number);
3739 if (config->bind_address)
3740 bgp_add_route(config->bind_address, 0xffffffff);
3741
3742 for (i = 0; i < BGP_NUM_PEERS; i++)
3743 {
3744 if (config->neighbour[i].name[0])
3745 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3746 config->neighbour[i].as, config->neighbour[i].keepalive,
3747 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3748 }
3749 #endif /* BGP */
3750
3751 while (!main_quit || still_busy())
3752 {
3753 int more = 0;
3754 int n;
3755
3756
3757 if (main_reload)
3758 {
3759 main_reload = 0;
3760 read_config_file();
3761 config->reload_config++;
3762 }
3763
3764 if (config->reload_config)
3765 {
3766 config->reload_config = 0;
3767 update_config();
3768 }
3769
3770 #ifdef BGP
3771 bgp_set_poll();
3772 #endif /* BGP */
3773
3774 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3775 STAT(select_called);
3776
3777 TIME = now(NULL);
3778 if (n < 0)
3779 {
3780 if (errno == EINTR ||
3781 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3782 continue;
3783
3784 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3785 break; // exit
3786 }
3787
3788 if (n)
3789 {
3790 struct sockaddr_in addr;
3791 struct in_addr local;
3792 socklen_t alen;
3793 int c, s;
3794 int udp_ready = 0;
3795 int tun_ready = 0;
3796 int cluster_ready = 0;
3797 int udp_pkts = 0;
3798 int tun_pkts = 0;
3799 int cluster_pkts = 0;
3800 #ifdef BGP
3801 uint32_t bgp_events[BGP_NUM_PEERS];
3802 memset(bgp_events, 0, sizeof(bgp_events));
3803 #endif /* BGP */
3804
3805 for (c = n, i = 0; i < c; i++)
3806 {
3807 struct event_data *d = events[i].data.ptr;
3808
3809 switch (d->type)
3810 {
3811 case FD_TYPE_CLI: // CLI connections
3812 {
3813 int cli;
3814
3815 alen = sizeof(addr);
3816 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3817 {
3818 cli_do(cli);
3819 close(cli);
3820 }
3821 else
3822 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3823
3824 n--;
3825 break;
3826 }
3827
3828 // these are handled below, with multiple interleaved reads
3829 case FD_TYPE_CLUSTER: cluster_ready++; break;
3830 case FD_TYPE_TUN: tun_ready++; break;
3831 case FD_TYPE_UDP: udp_ready++; break;
3832
3833 case FD_TYPE_CONTROL: // nsctl commands
3834 alen = sizeof(addr);
3835 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3836 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3837 n--;
3838 break;
3839
3840 case FD_TYPE_DAE: // DAE requests
3841 alen = sizeof(addr);
3842 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3843 if (s > 0) processdae(buf, s, &addr, alen, &local);
3844 n--;
3845 break;
3846
3847 case FD_TYPE_RADIUS: // RADIUS response
3848 alen = sizeof(addr);
3849 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3850 if (s >= 0 && config->cluster_iam_master)
3851 {
3852 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3853 addr.sin_addr.s_addr == config->radiusserver[1])
3854 processrad(buf, s, d->index);
3855 else
3856 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3857 fmtaddr(addr.sin_addr.s_addr, 0));
3858 }
3859
3860 n--;
3861 break;
3862
3863 #ifdef BGP
3864 case FD_TYPE_BGP:
3865 bgp_events[d->index] = events[i].events;
3866 n--;
3867 break;
3868 #endif /* BGP */
3869
3870 default:
3871 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3872 }
3873 }
3874
3875 #ifdef BGP
3876 bgp_process(bgp_events);
3877 #endif /* BGP */
3878
3879 for (c = 0; n && c < config->multi_read_count; c++)
3880 {
3881 // L2TP
3882 if (udp_ready)
3883 {
3884 alen = sizeof(addr);
3885 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3886 {
3887 processudp(buf, s, &addr);
3888 udp_pkts++;
3889 }
3890 else
3891 {
3892 udp_ready = 0;
3893 n--;
3894 }
3895 }
3896
3897 // incoming IP
3898 if (tun_ready)
3899 {
3900 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3901 {
3902 processtun(buf, s);
3903 tun_pkts++;
3904 }
3905 else
3906 {
3907 tun_ready = 0;
3908 n--;
3909 }
3910 }
3911
3912 // cluster
3913 if (cluster_ready)
3914 {
3915 alen = sizeof(addr);
3916 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3917 {
3918 processcluster(buf, s, addr.sin_addr.s_addr);
3919 cluster_pkts++;
3920 }
3921 else
3922 {
3923 cluster_ready = 0;
3924 n--;
3925 }
3926 }
3927 }
3928
3929 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3930 STAT(multi_read_used);
3931
3932 if (c >= config->multi_read_count)
3933 {
3934 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3935 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3936
3937 STAT(multi_read_exceeded);
3938 more++;
3939 }
3940 }
3941
3942 if (time_changed)
3943 {
3944 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3945
3946 // Log current traffic stats
3947 snprintf(config->bandwidth, sizeof(config->bandwidth),
3948 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3949 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3950 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
3951 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
3952
3953 udp_tx = udp_rx = 0;
3954 udp_rx_pkt = eth_rx_pkt = 0;
3955 eth_tx = eth_rx = 0;
3956 time_changed = 0;
3957
3958 if (config->dump_speed)
3959 printf("%s\n", config->bandwidth);
3960
3961 // Update the internal time counter
3962 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3963
3964 {
3965 // Run timer hooks
3966 struct param_timer p = { time_now };
3967 run_plugins(PLUGIN_TIMER, &p);
3968 }
3969 }
3970
3971 // Runs on every machine (master and slaves).
3972 if (next_cluster_ping <= TIME)
3973 {
3974 // Check to see which of the cluster is still alive..
3975
3976 cluster_send_ping(basetime); // Only does anything if we're a slave
3977 cluster_check_master(); // ditto.
3978
3979 cluster_heartbeat(); // Only does anything if we're a master.
3980 cluster_check_slaves(); // ditto.
3981
3982 master_update_counts(); // If we're a slave, send our byte counters to our master.
3983
3984 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
3985 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
3986 else
3987 next_cluster_ping = TIME + config->cluster_hb_interval;
3988 }
3989
3990 if (!config->cluster_iam_master)
3991 continue;
3992
3993 // Run token bucket filtering queue..
3994 // Only run it every 1/10th of a second.
3995 {
3996 static clockt last_run = 0;
3997 if (last_run != TIME)
3998 {
3999 last_run = TIME;
4000 tbf_run_timer();
4001 }
4002 }
4003
4004 // Handle timeouts, retries etc.
4005 {
4006 static double last_clean = 0;
4007 double this_clean;
4008 double diff;
4009
4010 TIME = now(&this_clean);
4011 diff = this_clean - last_clean;
4012
4013 // Run during idle time (after we've handled
4014 // all incoming packets) or every 1/10th sec
4015 if (!more || diff > 0.1)
4016 {
4017 regular_cleanups(diff);
4018 last_clean = this_clean;
4019 }
4020 }
4021
4022 if (*config->accounting_dir)
4023 {
4024 static clockt next_acct = 0;
4025 static clockt next_shut_acct = 0;
4026
4027 if (next_acct <= TIME)
4028 {
4029 // Dump accounting data
4030 next_acct = TIME + ACCT_TIME;
4031 next_shut_acct = TIME + ACCT_SHUT_TIME;
4032 dump_acct_info(1);
4033 }
4034 else if (next_shut_acct <= TIME)
4035 {
4036 // Dump accounting data for shutdown sessions
4037 next_shut_acct = TIME + ACCT_SHUT_TIME;
4038 if (shut_acct_n)
4039 dump_acct_info(0);
4040 }
4041 }
4042 }
4043
4044 // Are we the master and shutting down??
4045 if (config->cluster_iam_master)
4046 cluster_heartbeat(); // Flush any queued changes..
4047
4048 // Ok. Notify everyone we're shutting down. If we're
4049 // the master, this will force an election.
4050 cluster_send_ping(0);
4051
4052 //
4053 // Important!!! We MUST not process any packets past this point!
4054 LOG(1, 0, 0, "Shutdown complete\n");
4055 }
4056
4057 static void stripdomain(char *host)
4058 {
4059 char *p;
4060
4061 if ((p = strchr(host, '.')))
4062 {
4063 char *domain = 0;
4064 char _domain[1024];
4065
4066 // strip off domain
4067 FILE *resolv = fopen("/etc/resolv.conf", "r");
4068 if (resolv)
4069 {
4070 char buf[1024];
4071 char *b;
4072
4073 while (fgets(buf, sizeof(buf), resolv))
4074 {
4075 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4076 continue;
4077
4078 if (!isspace(buf[6]))
4079 continue;
4080
4081 b = buf + 7;
4082 while (isspace(*b)) b++;
4083
4084 if (*b)
4085 {
4086 char *d = b;
4087 while (*b && !isspace(*b)) b++;
4088 *b = 0;
4089 if (buf[0] == 'd') // domain is canonical
4090 {
4091 domain = d;
4092 break;
4093 }
4094
4095 // first search line
4096 if (!domain)
4097 {
4098 // hold, may be subsequent domain line
4099 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4100 domain = _domain;
4101 }
4102 }
4103 }
4104
4105 fclose(resolv);
4106 }
4107
4108 if (domain)
4109 {
4110 int hl = strlen(host);
4111 int dl = strlen(domain);
4112 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4113 host[hl -dl - 1] = 0;
4114 }
4115 else
4116 {
4117 *p = 0; // everything after first dot
4118 }
4119 }
4120 }
4121
4122 // Init data structures
4123 static void initdata(int optdebug, char *optconfig)
4124 {
4125 int i;
4126
4127 if (!(config = shared_malloc(sizeof(configt))))
4128 {
4129 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4130 exit(1);
4131 }
4132
4133 memset(config, 0, sizeof(configt));
4134 time(&config->start_time);
4135 strncpy(config->config_file, optconfig, strlen(optconfig));
4136 config->debug = optdebug;
4137 config->num_tbfs = MAXTBFS;
4138 config->rl_rate = 28; // 28kbps
4139 config->cluster_mcast_ttl = 1;
4140 config->cluster_master_min_adv = 1;
4141 config->ppp_restart_time = 3;
4142 config->ppp_max_configure = 10;
4143 config->ppp_max_failure = 5;
4144 config->kill_timedout_sessions = 1;
4145 strcpy(config->random_device, RANDOMDEVICE);
4146
4147 log_stream = stderr;
4148
4149 #ifdef RINGBUFFER
4150 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4151 {
4152 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4153 exit(1);
4154 }
4155 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4156 #endif
4157
4158 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4159 {
4160 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4161 exit(1);
4162 }
4163 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4164 {
4165 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4166 exit(1);
4167 }
4168 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4169 {
4170 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4171 exit(1);
4172 }
4173 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4174 {
4175 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4176 exit(1);
4177 }
4178 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4179 {
4180 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4181 exit(1);
4182 }
4183
4184 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4185 {
4186 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4187 exit(1);
4188 }
4189
4190 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4191 {
4192 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4193 exit(1);
4194 }
4195
4196 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4197 {
4198 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4199 exit(1);
4200 }
4201
4202 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4203 {
4204 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4205 exit(1);
4206 }
4207 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4208
4209 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4210 {
4211 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4212 exit(1);
4213 }
4214 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4215
4216 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4217 {
4218 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4219 exit(1);
4220 }
4221 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4222
4223 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4224 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4225 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4226 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4227 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4228
4229 // Put all the sessions on the free list marked as undefined.
4230 for (i = 1; i < MAXSESSION; i++)
4231 {
4232 session[i].next = i + 1;
4233 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4234 }
4235 session[MAXSESSION - 1].next = 0;
4236 sessionfree = 1;
4237
4238 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4239 for (i = 1; i < MAXTUNNEL; i++)
4240 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4241
4242 for (i = 1; i < MAXBUNDLE; i++) {
4243 bundle[i].state = BUNDLEUNDEF;
4244 }
4245
4246 if (!*hostname)
4247 {
4248 // Grab my hostname unless it's been specified
4249 gethostname(hostname, sizeof(hostname));
4250 stripdomain(hostname);
4251 }
4252
4253 _statistics->start_time = _statistics->last_reset = time(NULL);
4254
4255 #ifdef BGP
4256 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4257 {
4258 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4259 exit(1);
4260 }
4261 #endif /* BGP */
4262 }
4263
4264 static int assign_ip_address(sessionidt s)
4265 {
4266 uint32_t i;
4267 int best = -1;
4268 time_t best_time = time_now;
4269 char *u = session[s].user;
4270 char reuse = 0;
4271
4272
4273 CSTAT(assign_ip_address);
4274
4275 for (i = 1; i < ip_pool_size; i++)
4276 {
4277 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4278 continue;
4279
4280 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4281 {
4282 best = i;
4283 reuse = 1;
4284 break;
4285 }
4286
4287 if (ip_address_pool[i].last < best_time)
4288 {
4289 best = i;
4290 if (!(best_time = ip_address_pool[i].last))
4291 break; // never used, grab this one
4292 }
4293 }
4294
4295 if (best < 0)
4296 {
4297 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4298 return 0;
4299 }
4300
4301 session[s].ip = ip_address_pool[best].address;
4302 session[s].ip_pool_index = best;
4303 ip_address_pool[best].assigned = 1;
4304 ip_address_pool[best].last = time_now;
4305 ip_address_pool[best].session = s;
4306 if (session[s].walled_garden)
4307 /* Don't track addresses of users in walled garden (note: this
4308 means that their address isn't "sticky" even if they get
4309 un-gardened). */
4310 ip_address_pool[best].user[0] = 0;
4311 else
4312 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4313
4314 STAT(ip_allocated);
4315 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4316 reuse ? "Reusing" : "Allocating", best);
4317
4318 return 1;
4319 }
4320
4321 static void free_ip_address(sessionidt s)
4322 {
4323 int i = session[s].ip_pool_index;
4324
4325
4326 CSTAT(free_ip_address);
4327
4328 if (!session[s].ip)
4329 return; // what the?
4330
4331 if (i < 0) // Is this actually part of the ip pool?
4332 i = 0;
4333
4334 STAT(ip_freed);
4335 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4336 session[s].ip = 0;
4337 ip_address_pool[i].assigned = 0;
4338 ip_address_pool[i].session = 0;
4339 ip_address_pool[i].last = time_now;
4340 }
4341
4342 //
4343 // Fsck the address pool against the session table.
4344 // Normally only called when we become a master.
4345 //
4346 // This isn't perfect: We aren't keep tracking of which
4347 // users used to have an IP address.
4348 //
4349 void rebuild_address_pool(void)
4350 {
4351 int i;
4352
4353 //
4354 // Zero the IP pool allocation, and build
4355 // a map from IP address to pool index.
4356 for (i = 1; i < MAXIPPOOL; ++i)
4357 {
4358 ip_address_pool[i].assigned = 0;
4359 ip_address_pool[i].session = 0;
4360 if (!ip_address_pool[i].address)
4361 continue;
4362
4363 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4364 }
4365
4366 for (i = 0; i < MAXSESSION; ++i)
4367 {
4368 int ipid;
4369 if (!(session[i].opened && session[i].ip))
4370 continue;
4371
4372 ipid = - lookup_ipmap(htonl(session[i].ip));
4373
4374 if (session[i].ip_pool_index < 0)
4375 {
4376 // Not allocated out of the pool.
4377 if (ipid < 1) // Not found in the pool either? good.
4378 continue;
4379
4380 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4381 i, fmtaddr(session[i].ip, 0), ipid);
4382
4383 // Fall through and process it as part of the pool.
4384 }
4385
4386
4387 if (ipid > MAXIPPOOL || ipid < 0)
4388 {
4389 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4390 ipid = -1;
4391 session[i].ip_pool_index = ipid;
4392 continue;
4393 }
4394
4395 ip_address_pool[ipid].assigned = 1;
4396 ip_address_pool[ipid].session = i;
4397 ip_address_pool[ipid].last = time_now;
4398 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4399 session[i].ip_pool_index = ipid;
4400 cache_ipmap(session[i].ip, i); // Fix the ip map.
4401 }
4402 }
4403
4404 //
4405 // Fix the address pool to match a changed session.
4406 // (usually when the master sends us an update).
4407 static void fix_address_pool(int sid)
4408 {
4409 int ipid;
4410
4411 ipid = session[sid].ip_pool_index;
4412
4413 if (ipid > ip_pool_size)
4414 return; // Ignore it. rebuild_address_pool will fix it up.
4415
4416 if (ip_address_pool[ipid].address != session[sid].ip)
4417 return; // Just ignore it. rebuild_address_pool will take care of it.
4418
4419 ip_address_pool[ipid].assigned = 1;
4420 ip_address_pool[ipid].session = sid;
4421 ip_address_pool[ipid].last = time_now;
4422 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4423 }
4424
4425 //
4426 // Add a block of addresses to the IP pool to hand out.
4427 //
4428 static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
4429 {
4430 int i;
4431 if (mask == 0)
4432 mask = 0xffffffff; // Host route only.
4433
4434 addr &= mask;
4435
4436 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4437 return ;
4438
4439 for (i = addr ;(i & mask) == addr; ++i)
4440 {
4441 if ((i & 0xff) == 0 || (i&0xff) == 255)
4442 continue; // Skip 0 and broadcast addresses.
4443
4444 ip_address_pool[ip_pool_size].address = i;
4445 ip_address_pool[ip_pool_size].assigned = 0;
4446 ++ip_pool_size;
4447 if (ip_pool_size >= MAXIPPOOL)
4448 {
4449 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4450 return;
4451 }
4452 }
4453 }
4454
4455 // Initialize the IP address pool
4456 static void initippool()
4457 {
4458 FILE *f;
4459 char *p;
4460 char buf[4096];
4461 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4462
4463 if (!(f = fopen(IPPOOLFILE, "r")))
4464 {
4465 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4466 exit(1);
4467 }
4468
4469 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4470 {
4471 char *pool = buf;
4472 buf[4095] = 0; // Force it to be zero terminated/
4473
4474 if (*buf == '#' || *buf == '\n')
4475 continue; // Skip comments / blank lines
4476 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4477 if ((p = (char *)strchr(buf, ':')))
4478 {
4479 in_addr_t src;
4480 *p = '\0';
4481 src = inet_addr(buf);
4482 if (src == INADDR_NONE)
4483 {
4484 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4485 exit(1);
4486 }
4487 // This entry is for a specific IP only
4488 if (src != config->bind_address)
4489 continue;
4490 *p = ':';
4491 pool = p+1;
4492 }
4493 if ((p = (char *)strchr(pool, '/')))
4494 {
4495 // It's a range
4496 int numbits = 0;
4497 in_addr_t start = 0, mask = 0;
4498
4499 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4500 *p++ = 0;
4501 if (!*p || !(numbits = atoi(p)))
4502 {
4503 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4504 continue;
4505 }
4506 start = ntohl(inet_addr(pool));
4507 mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
4508
4509 // Add a static route for this pool
4510 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
4511 fmtaddr(htonl(start), 0), 32 + mask);
4512
4513 routeset(0, start, mask, 0, 1);
4514
4515 add_to_ip_pool(start, mask);
4516 }
4517 else
4518 {
4519 // It's a single ip address
4520 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4521 }
4522 }
4523 fclose(f);
4524 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4525 }
4526
4527 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4528 {
4529 struct sockaddr_in snoop_addr = {0};
4530 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4531 return;
4532
4533 snoop_addr.sin_family = AF_INET;
4534 snoop_addr.sin_addr.s_addr = destination;
4535 snoop_addr.sin_port = ntohs(port);
4536
4537 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4538 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4539 htons(snoop_addr.sin_port));
4540
4541 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4542 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4543
4544 STAT(packets_snooped);
4545 }
4546
4547 static int dump_session(FILE **f, sessiont *s)
4548 {
4549 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4550 return 1;
4551
4552 if (!*f)
4553 {
4554 char filename[1024];
4555 char timestr[64];
4556 time_t now = time(NULL);
4557
4558 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4559 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4560
4561 if (!(*f = fopen(filename, "w")))
4562 {
4563 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4564 return 0;
4565 }
4566
4567 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4568 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4569 "# host: %s\n"
4570 "# endpoint: %s\n"
4571 "# time: %ld\n"
4572 "# uptime: %ld\n"
4573 "# format: username ip qos uptxoctets downrxoctets\n",
4574 hostname,
4575 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4576 now,
4577 now - basetime);
4578 }
4579
4580 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4581 fprintf(*f, "%s %s %d %u %u\n",
4582 s->user, // username
4583 fmtaddr(htonl(s->ip), 0), // ip
4584 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4585 (uint32_t) s->cin_delta, // uptxoctets
4586 (uint32_t) s->cout_delta); // downrxoctets
4587
4588 s->cin_delta = s->cout_delta = 0;
4589
4590 return 1;
4591 }
4592
4593 static void dump_acct_info(int all)
4594 {
4595 int i;
4596 FILE *f = NULL;
4597
4598
4599 CSTAT(dump_acct_info);
4600
4601 if (shut_acct_n)
4602 {
4603 for (i = 0; i < shut_acct_n; i++)
4604 dump_session(&f, &shut_acct[i]);
4605
4606 shut_acct_n = 0;
4607 }
4608
4609 if (all)
4610 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4611 dump_session(&f, &session[i]);
4612
4613 if (f)
4614 fclose(f);
4615 }
4616
4617 // Main program
4618 int main(int argc, char *argv[])
4619 {
4620 int i;
4621 int optdebug = 0;
4622 char *optconfig = CONFIGFILE;
4623
4624 time(&basetime); // start clock
4625
4626 // scan args
4627 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4628 {
4629 switch (i)
4630 {
4631 case 'd':
4632 if (fork()) exit(0);
4633 setsid();
4634 freopen("/dev/null", "r", stdin);
4635 freopen("/dev/null", "w", stdout);
4636 freopen("/dev/null", "w", stderr);
4637 break;
4638 case 'v':
4639 optdebug++;
4640 break;
4641 case 'c':
4642 optconfig = optarg;
4643 break;
4644 case 'h':
4645 snprintf(hostname, sizeof(hostname), "%s", optarg);
4646 break;
4647 default:
4648 printf("Args are:\n"
4649 "\t-d\t\tDetach from terminal\n"
4650 "\t-c <file>\tConfig file\n"
4651 "\t-h <hostname>\tForce hostname\n"
4652 "\t-v\t\tDebug\n");
4653
4654 return (0);
4655 break;
4656 }
4657 }
4658
4659 // Start the timer routine off
4660 time(&time_now);
4661 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4662
4663 initplugins();
4664 initdata(optdebug, optconfig);
4665
4666 init_cli(hostname);
4667 read_config_file();
4668 update_config();
4669 init_tbf(config->num_tbfs);
4670
4671 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4672 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4673 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4674 {
4675 struct rlimit rlim;
4676 rlim.rlim_cur = RLIM_INFINITY;
4677 rlim.rlim_max = RLIM_INFINITY;
4678 // Remove the maximum core size
4679 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4680 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4681
4682 // Make core dumps go to /tmp
4683 chdir("/tmp");
4684 }
4685
4686 if (config->scheduler_fifo)
4687 {
4688 int ret;
4689 struct sched_param params = {0};
4690 params.sched_priority = 1;
4691
4692 if (get_nprocs() < 2)
4693 {
4694 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4695 config->scheduler_fifo = 0;
4696 }
4697 else
4698 {
4699 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4700 {
4701 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4702 }
4703 else
4704 {
4705 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4706 config->scheduler_fifo = 0;
4707 }
4708 }
4709 }
4710
4711 initnetlink();
4712
4713 /* Set up the cluster communications port. */
4714 if (cluster_init() < 0)
4715 exit(1);
4716
4717 inittun();
4718 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4719
4720 initudp();
4721 initrad();
4722 initippool();
4723
4724 // seed prng
4725 {
4726 unsigned seed = time_now ^ getpid();
4727 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4728 srand(seed);
4729 }
4730
4731 signal(SIGHUP, sighup_handler);
4732 signal(SIGCHLD, sigchild_handler);
4733 signal(SIGTERM, shutdown_handler);
4734 signal(SIGINT, shutdown_handler);
4735 signal(SIGQUIT, shutdown_handler);
4736
4737 // Prevent us from getting paged out
4738 if (config->lock_pages)
4739 {
4740 if (!mlockall(MCL_CURRENT))
4741 LOG(1, 0, 0, "Locking pages into memory\n");
4742 else
4743 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4744 }
4745
4746 mainloop();
4747
4748 /* remove plugins (so cleanup code gets run) */
4749 plugins_done();
4750
4751 // Remove the PID file if we wrote it
4752 if (config->wrote_pid && *config->pid_file == '/')
4753 unlink(config->pid_file);
4754
4755 /* kill CLI children */
4756 signal(SIGTERM, SIG_IGN);
4757 kill(0, SIGTERM);
4758 return 0;
4759 }
4760
4761 static void sighup_handler(int sig)
4762 {
4763 main_reload++;
4764 }
4765
4766 static void shutdown_handler(int sig)
4767 {
4768 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4769 }
4770
4771 static void sigchild_handler(int sig)
4772 {
4773 while (waitpid(-1, NULL, WNOHANG) > 0)
4774 ;
4775 }
4776
4777 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4778 {
4779 MD5_CTX ctx;
4780 *challenge_response = NULL;
4781
4782 if (!*config->l2tp_secret)
4783 {
4784 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4785 return;
4786 }
4787
4788 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4789
4790 *challenge_response = calloc(17, 1);
4791
4792 MD5_Init(&ctx);
4793 MD5_Update(&ctx, &id, 1);
4794 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4795 MD5_Update(&ctx, challenge, challenge_length);
4796 MD5_Final(*challenge_response, &ctx);
4797
4798 return;
4799 }
4800
4801 static int facility_value(char *name)
4802 {
4803 int i;
4804 for (i = 0; facilitynames[i].c_name; i++)
4805 {
4806 if (strcmp(facilitynames[i].c_name, name) == 0)
4807 return facilitynames[i].c_val;
4808 }
4809 return 0;
4810 }
4811
4812 static void update_config()
4813 {
4814 int i;
4815 char *p;
4816 static int timeout = 0;
4817 static int interval = 0;
4818
4819 // Update logging
4820 closelog();
4821 syslog_log = 0;
4822 if (log_stream)
4823 {
4824 if (log_stream != stderr)
4825 fclose(log_stream);
4826
4827 log_stream = NULL;
4828 }
4829
4830 if (*config->log_filename)
4831 {
4832 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4833 {
4834 char *p = config->log_filename + 7;
4835 if (*p)
4836 {
4837 openlog("l2tpns", LOG_PID, facility_value(p));
4838 syslog_log = 1;
4839 }
4840 }
4841 else if (strchr(config->log_filename, '/') == config->log_filename)
4842 {
4843 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4844 {
4845 fseek(log_stream, 0, SEEK_END);
4846 setbuf(log_stream, NULL);
4847 }
4848 else
4849 {
4850 log_stream = stderr;
4851 setbuf(log_stream, NULL);
4852 }
4853 }
4854 }
4855 else
4856 {
4857 log_stream = stderr;
4858 setbuf(log_stream, NULL);
4859 }
4860
4861 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4862 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4863
4864 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4865 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4866 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4867
4868 // reset MRU/MSS globals
4869 MRU = config->l2tp_mtu - L2TP_HDRS;
4870 if (MRU > PPPoE_MRU)
4871 MRU = PPPoE_MRU;
4872
4873 MSS = MRU - TCP_HDRS;
4874
4875 // Update radius
4876 config->numradiusservers = 0;
4877 for (i = 0; i < MAXRADSERVER; i++)
4878 if (config->radiusserver[i])
4879 {
4880 config->numradiusservers++;
4881 // Set radius port: if not set, take the port from the
4882 // first radius server. For the first radius server,
4883 // take the #defined default value from l2tpns.h
4884
4885 // test twice, In case someone works with
4886 // a secondary radius server without defining
4887 // a primary one, this will work even then.
4888 if (i > 0 && !config->radiusport[i])
4889 config->radiusport[i] = config->radiusport[i-1];
4890 if (!config->radiusport[i])
4891 config->radiusport[i] = RADPORT;
4892 }
4893
4894 if (!config->numradiusservers)
4895 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4896
4897 // parse radius_authtypes_s
4898 config->radius_authtypes = config->radius_authprefer = 0;
4899 p = config->radius_authtypes_s;
4900 while (p && *p)
4901 {
4902 char *s = strpbrk(p, " \t,");
4903 int type = 0;
4904
4905 if (s)
4906 {
4907 *s++ = 0;
4908 while (*s == ' ' || *s == '\t')
4909 s++;
4910
4911 if (!*s)
4912 s = 0;
4913 }
4914
4915 if (!strncasecmp("chap", p, strlen(p)))
4916 type = AUTHCHAP;
4917 else if (!strncasecmp("pap", p, strlen(p)))
4918 type = AUTHPAP;
4919 else
4920 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4921
4922 config->radius_authtypes |= type;
4923 if (!config->radius_authprefer)
4924 config->radius_authprefer = type;
4925
4926 p = s;
4927 }
4928
4929 if (!config->radius_authtypes)
4930 {
4931 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4932 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4933 }
4934
4935 // normalise radius_authtypes_s
4936 if (config->radius_authprefer == AUTHPAP)
4937 {
4938 strcpy(config->radius_authtypes_s, "pap");
4939 if (config->radius_authtypes & AUTHCHAP)
4940 strcat(config->radius_authtypes_s, ", chap");
4941 }
4942 else
4943 {
4944 strcpy(config->radius_authtypes_s, "chap");
4945 if (config->radius_authtypes & AUTHPAP)
4946 strcat(config->radius_authtypes_s, ", pap");
4947 }
4948
4949 if (!config->radius_dae_port)
4950 config->radius_dae_port = DAEPORT;
4951
4952 // re-initialise the random number source
4953 initrandom(config->random_device);
4954
4955 // Update plugins
4956 for (i = 0; i < MAXPLUGINS; i++)
4957 {
4958 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4959 continue;
4960
4961 if (*config->plugins[i])
4962 {
4963 // Plugin added
4964 add_plugin(config->plugins[i]);
4965 }
4966 else if (*config->old_plugins[i])
4967 {
4968 // Plugin removed
4969 remove_plugin(config->old_plugins[i]);
4970 }
4971 }
4972
4973 // Guest change
4974 guest_accounts_num = 0;
4975 char *p2 = config->guest_user;
4976 while (p2 && *p2)
4977 {
4978 char *s = strpbrk(p2, " \t,");
4979 if (s)
4980 {
4981 *s++ = 0;
4982 while (*s == ' ' || *s == '\t')
4983 s++;
4984
4985 if (!*s)
4986 s = 0;
4987 }
4988
4989 strcpy(guest_users[guest_accounts_num], p2);
4990 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
4991 guest_accounts_num++;
4992 p2 = s;
4993 }
4994 // Rebuild the guest_user array
4995 strcpy(config->guest_user, "");
4996 int ui = 0;
4997 for (ui=0; ui<guest_accounts_num; ui++)
4998 {
4999 strcat(config->guest_user, guest_users[ui]);
5000 if (ui<guest_accounts_num-1)
5001 {
5002 strcat(config->guest_user, ",");
5003 }
5004 }
5005
5006
5007 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5008 if (!config->multi_read_count) config->multi_read_count = 10;
5009 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5010 if (!*config->cluster_interface)
5011 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5012
5013 if (!config->cluster_hb_interval)
5014 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5015
5016 if (!config->cluster_hb_timeout)
5017 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5018
5019 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5020 {
5021 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5022 // late, ensure we're sufficiently larger than that
5023 int t = 4 * config->cluster_hb_interval + 11;
5024
5025 if (config->cluster_hb_timeout < t)
5026 {
5027 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5028 config->cluster_hb_timeout = t;
5029 }
5030
5031 // Push timing changes to the slaves immediately if we're the master
5032 if (config->cluster_iam_master)
5033 cluster_heartbeat();
5034
5035 interval = config->cluster_hb_interval;
5036 timeout = config->cluster_hb_timeout;
5037 }
5038
5039 // Write PID file
5040 if (*config->pid_file == '/' && !config->wrote_pid)
5041 {
5042 FILE *f;
5043 if ((f = fopen(config->pid_file, "w")))
5044 {
5045 fprintf(f, "%d\n", getpid());
5046 fclose(f);
5047 config->wrote_pid = 1;
5048 }
5049 else
5050 {
5051 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5052 }
5053 }
5054 }
5055
5056 static void read_config_file()
5057 {
5058 FILE *f;
5059
5060 if (!config->config_file) return;
5061 if (!(f = fopen(config->config_file, "r")))
5062 {
5063 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5064 return;
5065 }
5066
5067 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5068 cli_do_file(f);
5069 LOG(3, 0, 0, "Done reading config file\n");
5070 fclose(f);
5071 }
5072
5073 int sessionsetup(sessionidt s, tunnelidt t)
5074 {
5075 // A session now exists, set it up
5076 in_addr_t ip;
5077 char *user;
5078 sessionidt i;
5079 int r;
5080
5081 CSTAT(sessionsetup);
5082
5083 LOG(3, s, t, "Doing session setup for session\n");
5084
5085 // Join a bundle if the MRRU option is accepted
5086 if(session[s].mrru > 0 && session[s].bundle == 0)
5087 {
5088 LOG(3, s, t, "This session can be part of multilink bundle\n");
5089 if (join_bundle(s) > 0)
5090 cluster_send_bundle(session[s].bundle);
5091 else
5092 {
5093 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5094 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5095 return 0;
5096 }
5097 }
5098
5099 if (!session[s].ip)
5100 {
5101 assign_ip_address(s);
5102 if (!session[s].ip)
5103 {
5104 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5105 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5106 return 0;
5107 }
5108 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5109 fmtaddr(htonl(session[s].ip), 0));
5110 }
5111
5112
5113 // Make sure this is right
5114 session[s].tunnel = t;
5115
5116 // zap old sessions with same IP and/or username
5117 // Don't kill gardened sessions - doing so leads to a DoS
5118 // from someone who doesn't need to know the password
5119 {
5120 ip = session[s].ip;
5121 user = session[s].user;
5122 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5123 {
5124 if (i == s) continue;
5125 if (!session[s].opened) continue;
5126 // Allow duplicate sessions for multilink ones of the same bundle.
5127 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
5128 continue;
5129 if (ip == session[i].ip)
5130 {
5131 sessionkill(i, "Duplicate IP address");
5132 continue;
5133 }
5134
5135 if (config->allow_duplicate_users) continue;
5136 if (session[s].walled_garden || session[i].walled_garden) continue;
5137 // Guest change
5138 int found = 0;
5139 int gu;
5140 for (gu = 0; gu < guest_accounts_num; gu++)
5141 {
5142 if (!strcasecmp(user, guest_users[gu]))
5143 {
5144 found = 1;
5145 break;
5146 }
5147 }
5148 if (found) continue;
5149
5150 // Drop the new session in case of duplicate sessionss, not the old one.
5151 if (!strcasecmp(user, session[i].user))
5152 sessionkill(i, "Duplicate session for users");
5153 }
5154 }
5155
5156 // no need to set a route for the same IP address of the bundle
5157 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5158 {
5159 int routed = 0;
5160
5161 // Add the route for this session.
5162 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5163 {
5164 if ((session[s].ip & session[s].route[r].mask) ==
5165 (session[s].route[r].ip & session[s].route[r].mask))
5166 routed++;
5167
5168 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
5169 }
5170
5171 // Static IPs need to be routed if not already
5172 // convered by a Framed-Route. Anything else is part
5173 // of the IP address pool and is already routed, it
5174 // just needs to be added to the IP cache.
5175 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5176 if (session[s].ip_pool_index == -1) // static ip
5177 {
5178 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5179 }
5180 else
5181 cache_ipmap(session[s].ip, s);
5182 }
5183
5184 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5185 lcp_open(s, t); // transition to Network phase and send initial IPCP
5186
5187 // Run the plugin's against this new session.
5188 {
5189 struct param_new_session data = { &tunnel[t], &session[s] };
5190 run_plugins(PLUGIN_NEW_SESSION, &data);
5191 }
5192
5193 // Allocate TBFs if throttled
5194 if (session[s].throttle_in || session[s].throttle_out)
5195 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5196
5197 session[s].last_packet = session[s].last_data = time_now;
5198
5199 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5200 fmtaddr(htonl(session[s].ip), 0),
5201 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5202
5203 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5204
5205 return 1; // RADIUS OK and IP allocated, done...
5206 }
5207
5208 //
5209 // This session just got dropped on us by the master or something.
5210 // Make sure our tables up up to date...
5211 //
5212 int load_session(sessionidt s, sessiont *new)
5213 {
5214 int i;
5215 int newip = 0;
5216
5217 // Sanity checks.
5218 if (new->ip_pool_index >= MAXIPPOOL ||
5219 new->tunnel >= MAXTUNNEL)
5220 {
5221 LOG(0, s, 0, "Strange session update received!\n");
5222 // FIXME! What to do here?
5223 return 0;
5224 }
5225
5226 //
5227 // Ok. All sanity checks passed. Now we're committed to
5228 // loading the new session.
5229 //
5230
5231 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5232
5233 // See if routes/ip cache need updating
5234 if (new->ip != session[s].ip)
5235 newip++;
5236
5237 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5238 if (new->route[i].ip != session[s].route[i].ip ||
5239 new->route[i].mask != session[s].route[i].mask)
5240 newip++;
5241
5242 // needs update
5243 if (newip)
5244 {
5245 int routed = 0;
5246
5247 // remove old routes...
5248 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5249 {
5250 if ((session[s].ip & session[s].route[i].mask) ==
5251 (session[s].route[i].ip & session[s].route[i].mask))
5252 routed++;
5253
5254 routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
5255 }
5256
5257 // ...ip
5258 if (session[s].ip)
5259 {
5260 if (session[s].ip_pool_index == -1) // static IP
5261 {
5262 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5263 }
5264 else // It's part of the IP pool, remove it manually.
5265 uncache_ipmap(session[s].ip);
5266 }
5267
5268 routed = 0;
5269
5270 // add new routes...
5271 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5272 {
5273 if ((new->ip & new->route[i].mask) ==
5274 (new->route[i].ip & new->route[i].mask))
5275 routed++;
5276
5277 routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
5278 }
5279
5280 // ...ip
5281 if (new->ip)
5282 {
5283 // If there's a new one, add it.
5284 if (new->ip_pool_index == -1)
5285 {
5286 if (!routed) routeset(s, new->ip, 0, 0, 1);
5287 }
5288 else
5289 cache_ipmap(new->ip, s);
5290 }
5291 }
5292
5293 // check v6 routing
5294 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5295 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5296
5297 // check filters
5298 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5299 {
5300 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5301 new->filter_in = 0;
5302 }
5303
5304 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5305 {
5306 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5307 new->filter_out = 0;
5308 }
5309
5310 if (new->filter_in != session[s].filter_in)
5311 {
5312 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5313 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5314 }
5315
5316 if (new->filter_out != session[s].filter_out)
5317 {
5318 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5319 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5320 }
5321
5322 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5323 // for walking the sessions to forward byte counts to the master.
5324 config->cluster_highest_sessionid = s;
5325
5326 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5327
5328 // Do fixups into address pool.
5329 if (new->ip_pool_index != -1)
5330 fix_address_pool(s);
5331
5332 return 1;
5333 }
5334
5335 static void initplugins()
5336 {
5337 int i;
5338
5339 loaded_plugins = ll_init();
5340 // Initialize the plugins to nothing
5341 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5342 plugins[i] = ll_init();
5343 }
5344
5345 static void *open_plugin(char *plugin_name, int load)
5346 {
5347 char path[256] = "";
5348
5349 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5350 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5351 return dlopen(path, RTLD_NOW);
5352 }
5353
5354 // plugin callback to get a config value
5355 static void *getconfig(char *key, enum config_typet type)
5356 {
5357 int i;
5358
5359 for (i = 0; config_values[i].key; i++)
5360 {
5361 if (!strcmp(config_values[i].key, key))
5362 {
5363 if (config_values[i].type == type)
5364 return ((void *) config) + config_values[i].offset;
5365
5366 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5367 key, type, config_values[i].type);
5368
5369 return 0;
5370 }
5371 }
5372
5373 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5374 return 0;
5375 }
5376
5377 static int add_plugin(char *plugin_name)
5378 {
5379 static struct pluginfuncs funcs = {
5380 _log,
5381 _log_hex,
5382 fmtaddr,
5383 sessionbyuser,
5384 sessiontbysessionidt,
5385 sessionidtbysessiont,
5386 radiusnew,
5387 radiussend,
5388 getconfig,
5389 sessionshutdown,
5390 sessionkill,
5391 throttle_session,
5392 cluster_send_session,
5393 };
5394
5395 void *p = open_plugin(plugin_name, 1);
5396 int (*initfunc)(struct pluginfuncs *);
5397 int i;
5398
5399 if (!p)
5400 {
5401 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5402 return -1;
5403 }
5404
5405 if (ll_contains(loaded_plugins, p))
5406 {
5407 dlclose(p);
5408 return 0; // already loaded
5409 }
5410
5411 {
5412 int *v = dlsym(p, "plugin_api_version");
5413 if (!v || *v != PLUGIN_API_VERSION)
5414 {
5415 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5416 dlclose(p);
5417 return -1;
5418 }
5419 }
5420
5421 if ((initfunc = dlsym(p, "plugin_init")))
5422 {
5423 if (!initfunc(&funcs))
5424 {
5425 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5426 dlclose(p);
5427 return -1;
5428 }
5429 }
5430
5431 ll_push(loaded_plugins, p);
5432
5433 for (i = 0; i < max_plugin_functions; i++)
5434 {
5435 void *x;
5436 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5437 {
5438 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5439 ll_push(plugins[i], x);
5440 }
5441 }
5442
5443 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5444 return 1;
5445 }
5446
5447 static void run_plugin_done(void *plugin)
5448 {
5449 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5450
5451 if (donefunc)
5452 donefunc();
5453 }
5454
5455 static int remove_plugin(char *plugin_name)
5456 {
5457 void *p = open_plugin(plugin_name, 0);
5458 int loaded = 0;
5459
5460 if (!p)
5461 return -1;
5462
5463 if (ll_contains(loaded_plugins, p))
5464 {
5465 int i;
5466 for (i = 0; i < max_plugin_functions; i++)
5467 {
5468 void *x;
5469 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5470 ll_delete(plugins[i], x);
5471 }
5472
5473 ll_delete(loaded_plugins, p);
5474 run_plugin_done(p);
5475 loaded = 1;
5476 }
5477
5478 dlclose(p);
5479 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5480 return loaded;
5481 }
5482
5483 int run_plugins(int plugin_type, void *data)
5484 {
5485 int (*func)(void *data);
5486
5487 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5488 return PLUGIN_RET_ERROR;
5489
5490 ll_reset(plugins[plugin_type]);
5491 while ((func = ll_next(plugins[plugin_type])))
5492 {
5493 int r = func(data);
5494
5495 if (r != PLUGIN_RET_OK)
5496 return r; // stop here
5497 }
5498
5499 return PLUGIN_RET_OK;
5500 }
5501
5502 static void plugins_done()
5503 {
5504 void *p;
5505
5506 ll_reset(loaded_plugins);
5507 while ((p = ll_next(loaded_plugins)))
5508 run_plugin_done(p);
5509 }
5510
5511 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5512 {
5513 struct nsctl request;
5514 struct nsctl response;
5515 int type = unpack_control(&request, buf, len);
5516 int r;
5517 void *p;
5518
5519 if (log_stream && config->debug >= 4)
5520 {
5521 if (type < 0)
5522 {
5523 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5524 fmtaddr(addr->sin_addr.s_addr, 0), type);
5525 }
5526 else
5527 {
5528 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5529 dump_control(&request, log_stream);
5530 }
5531 }
5532
5533 switch (type)
5534 {
5535 case NSCTL_REQ_LOAD:
5536 if (request.argc != 1)
5537 {
5538 response.type = NSCTL_RES_ERR;
5539 response.argc = 1;
5540 response.argv[0] = "name of plugin required";
5541 }
5542 else if ((r = add_plugin(request.argv[0])) < 1)
5543 {
5544 response.type = NSCTL_RES_ERR;
5545 response.argc = 1;
5546 response.argv[0] = !r
5547 ? "plugin already loaded"
5548 : "error loading plugin";
5549 }
5550 else
5551 {
5552 response.type = NSCTL_RES_OK;
5553 response.argc = 0;
5554 }
5555
5556 break;
5557
5558 case NSCTL_REQ_UNLOAD:
5559 if (request.argc != 1)
5560 {
5561 response.type = NSCTL_RES_ERR;
5562 response.argc = 1;
5563 response.argv[0] = "name of plugin required";
5564 }
5565 else if ((r = remove_plugin(request.argv[0])) < 1)
5566 {
5567 response.type = NSCTL_RES_ERR;
5568 response.argc = 1;
5569 response.argv[0] = !r
5570 ? "plugin not loaded"
5571 : "plugin not found";
5572 }
5573 else
5574 {
5575 response.type = NSCTL_RES_OK;
5576 response.argc = 0;
5577 }
5578
5579 break;
5580
5581 case NSCTL_REQ_HELP:
5582 response.type = NSCTL_RES_OK;
5583 response.argc = 0;
5584
5585 ll_reset(loaded_plugins);
5586 while ((p = ll_next(loaded_plugins)))
5587 {
5588 char **help = dlsym(p, "plugin_control_help");
5589 while (response.argc < 0xff && help && *help)
5590 response.argv[response.argc++] = *help++;
5591 }
5592
5593 break;
5594
5595 case NSCTL_REQ_CONTROL:
5596 {
5597 struct param_control param = {
5598 config->cluster_iam_master,
5599 request.argc,
5600 request.argv,
5601 0,
5602 NULL,
5603 };
5604
5605 int r = run_plugins(PLUGIN_CONTROL, &param);
5606
5607 if (r == PLUGIN_RET_ERROR)
5608 {
5609 response.type = NSCTL_RES_ERR;
5610 response.argc = 1;
5611 response.argv[0] = param.additional
5612 ? param.additional
5613 : "error returned by plugin";
5614 }
5615 else if (r == PLUGIN_RET_NOTMASTER)
5616 {
5617 static char msg[] = "must be run on master: 000.000.000.000";
5618
5619 response.type = NSCTL_RES_ERR;
5620 response.argc = 1;
5621 if (config->cluster_master_address)
5622 {
5623 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5624 response.argv[0] = msg;
5625 }
5626 else
5627 {
5628 response.argv[0] = "must be run on master: none elected";
5629 }
5630 }
5631 else if (!(param.response & NSCTL_RESPONSE))
5632 {
5633 response.type = NSCTL_RES_ERR;
5634 response.argc = 1;
5635 response.argv[0] = param.response
5636 ? "unrecognised response value from plugin"
5637 : "unhandled action";
5638 }
5639 else
5640 {
5641 response.type = param.response;
5642 response.argc = 0;
5643 if (param.additional)
5644 {
5645 response.argc = 1;
5646 response.argv[0] = param.additional;
5647 }
5648 }
5649 }
5650
5651 break;
5652
5653 default:
5654 response.type = NSCTL_RES_ERR;
5655 response.argc = 1;
5656 response.argv[0] = "error unpacking control packet";
5657 }
5658
5659 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5660 if (!buf)
5661 {
5662 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5663 return;
5664 }
5665
5666 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5667 if (r > 0)
5668 {
5669 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5670 if (log_stream && config->debug >= 4)
5671 {
5672 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5673 dump_control(&response, log_stream);
5674 }
5675 }
5676 else
5677 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5678 fmtaddr(addr->sin_addr.s_addr, 0), r);
5679
5680 free(buf);
5681 }
5682
5683 static tunnelidt new_tunnel()
5684 {
5685 tunnelidt i;
5686 for (i = 1; i < MAXTUNNEL; i++)
5687 {
5688 if (tunnel[i].state == TUNNELFREE)
5689 {
5690 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5691 if (i > config->cluster_highest_tunnelid)
5692 config->cluster_highest_tunnelid = i;
5693 return i;
5694 }
5695 }
5696 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5697 return 0;
5698 }
5699
5700 //
5701 // We're becoming the master. Do any required setup..
5702 //
5703 // This is principally telling all the plugins that we're
5704 // now a master, and telling them about all the sessions
5705 // that are active too..
5706 //
5707 void become_master(void)
5708 {
5709 int s, i;
5710 static struct event_data d[RADIUS_FDS];
5711 struct epoll_event e;
5712
5713 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5714
5715 // running a bunch of iptables commands is slow and can cause
5716 // the master to drop tunnels on takeover--kludge around the
5717 // problem by forking for the moment (note: race)
5718 if (!fork_and_close())
5719 {
5720 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5721 {
5722 if (!session[s].opened) // Not an in-use session.
5723 continue;
5724
5725 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5726 }
5727 exit(0);
5728 }
5729
5730 // add radius fds
5731 e.events = EPOLLIN;
5732 for (i = 0; i < RADIUS_FDS; i++)
5733 {
5734 d[i].type = FD_TYPE_RADIUS;
5735 d[i].index = i;
5736 e.data.ptr = &d[i];
5737
5738 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5739 }
5740 }
5741
5742 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5743 {
5744 int s, i;
5745 int count = 0;
5746 int buckets[64];
5747
5748 if (CLI_HELP_REQUESTED)
5749 return CLI_HELP_NO_ARGS;
5750
5751 time(&time_now);
5752 for (i = 0; i < 64;++i) buckets[i] = 0;
5753
5754 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5755 {
5756 int idle;
5757 if (!session[s].opened)
5758 continue;
5759
5760 idle = time_now - session[s].last_data;
5761 idle /= 5 ; // In multiples of 5 seconds.
5762 if (idle < 0)
5763 idle = 0;
5764 if (idle > 63)
5765 idle = 63;
5766
5767 ++count;
5768 ++buckets[idle];
5769 }
5770
5771 for (i = 0; i < 63; ++i)
5772 {
5773 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5774 }
5775 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5776 cli_print(cli, "%d total sessions open.", count);
5777 return CLI_OK;
5778 }
5779
5780 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5781 {
5782 int s, i;
5783 int count = 0;
5784 int buckets[64];
5785
5786 if (CLI_HELP_REQUESTED)
5787 return CLI_HELP_NO_ARGS;
5788
5789 time(&time_now);
5790 for (i = 0; i < 64;++i) buckets[i] = 0;
5791
5792 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5793 {
5794 int open = 0, d;
5795 if (!session[s].opened)
5796 continue;
5797
5798 d = time_now - session[s].opened;
5799 if (d < 0)
5800 d = 0;
5801 while (d > 1 && open < 32)
5802 {
5803 ++open;
5804 d >>= 1; // half.
5805 }
5806 ++count;
5807 ++buckets[open];
5808 }
5809
5810 s = 1;
5811 for (i = 0; i < 30; ++i)
5812 {
5813 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5814 s <<= 1;
5815 }
5816 cli_print(cli, "%d total sessions open.", count);
5817 return CLI_OK;
5818 }
5819
5820 /* Unhide an avp.
5821 *
5822 * This unencodes the AVP using the L2TP secret and the previously
5823 * stored random vector. It overwrites the hidden data with the
5824 * unhidden AVP subformat.
5825 */
5826 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5827 {
5828 MD5_CTX ctx;
5829 uint8_t digest[16];
5830 uint8_t *last;
5831 size_t d = 0;
5832 uint16_t m = htons(type);
5833
5834 // Compute initial pad
5835 MD5_Init(&ctx);
5836 MD5_Update(&ctx, (unsigned char *) &m, 2);
5837 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5838 MD5_Update(&ctx, vector, vec_len);
5839 MD5_Final(digest, &ctx);
5840
5841 // pointer to last decoded 16 octets
5842 last = value;
5843
5844 while (len > 0)
5845 {
5846 // calculate a new pad based on the last decoded block
5847 if (d >= sizeof(digest))
5848 {
5849 MD5_Init(&ctx);
5850 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5851 MD5_Update(&ctx, last, sizeof(digest));
5852 MD5_Final(digest, &ctx);
5853
5854 d = 0;
5855 last = value;
5856 }
5857
5858 *value++ ^= digest[d++];
5859 len--;
5860 }
5861 }
5862
5863 int find_filter(char const *name, size_t len)
5864 {
5865 int free = -1;
5866 int i;
5867
5868 for (i = 0; i < MAXFILTER; i++)
5869 {
5870 if (!*ip_filters[i].name)
5871 {
5872 if (free < 0)
5873 free = i;
5874
5875 continue;
5876 }
5877
5878 if (strlen(ip_filters[i].name) != len)
5879 continue;
5880
5881 if (!strncmp(ip_filters[i].name, name, len))
5882 return i;
5883 }
5884
5885 return free;
5886 }
5887
5888 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5889 {
5890 switch (p->op)
5891 {
5892 case FILTER_PORT_OP_EQ: return port == p->port;
5893 case FILTER_PORT_OP_NEQ: return port != p->port;
5894 case FILTER_PORT_OP_GT: return port > p->port;
5895 case FILTER_PORT_OP_LT: return port < p->port;
5896 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5897 }
5898
5899 return 0;
5900 }
5901
5902 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5903 {
5904 switch (op)
5905 {
5906 case FILTER_FLAG_OP_ANY:
5907 return (flags & sflags) || (~flags & cflags);
5908
5909 case FILTER_FLAG_OP_ALL:
5910 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5911
5912 case FILTER_FLAG_OP_EST:
5913 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5914 }
5915
5916 return 0;
5917 }
5918
5919 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5920 {
5921 uint16_t frag_offset;
5922 uint8_t proto;
5923 in_addr_t src_ip;
5924 in_addr_t dst_ip;
5925 uint16_t src_port = 0;
5926 uint16_t dst_port = 0;
5927 uint8_t flags = 0;
5928 ip_filter_rulet *rule;
5929
5930 if (len < 20) // up to end of destination address
5931 return 0;
5932
5933 if ((*buf >> 4) != 4) // IPv4
5934 return 0;
5935
5936 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5937 proto = buf[9];
5938 src_ip = *(in_addr_t *) (buf + 12);
5939 dst_ip = *(in_addr_t *) (buf + 16);
5940
5941 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5942 {
5943 int l = (buf[0] & 0xf) * 4; // length of IP header
5944 if (len < l + 4) // ports
5945 return 0;
5946
5947 src_port = ntohs(*(uint16_t *) (buf + l));
5948 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5949 if (proto == IPPROTO_TCP)
5950 {
5951 if (len < l + 14) // flags
5952 return 0;
5953
5954 flags = buf[l + 13] & 0x3f;
5955 }
5956 }
5957
5958 for (rule = ip_filters[filter].rules; rule->action; rule++)
5959 {
5960 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5961 continue;
5962
5963 if (rule->src_wild != INADDR_BROADCAST &&
5964 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5965 continue;
5966
5967 if (rule->dst_wild != INADDR_BROADCAST &&
5968 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
5969 continue;
5970
5971 if (frag_offset)
5972 {
5973 // layer 4 deny rules are skipped
5974 if (rule->action == FILTER_ACTION_DENY &&
5975 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
5976 continue;
5977 }
5978 else
5979 {
5980 if (rule->frag)
5981 continue;
5982
5983 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
5984 {
5985 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
5986 continue;
5987
5988 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
5989 continue;
5990
5991 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
5992 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
5993 continue;
5994 }
5995 }
5996
5997 // matched
5998 rule->counter++;
5999 return rule->action == FILTER_ACTION_PERMIT;
6000 }
6001
6002 // default deny
6003 return 0;
6004 }