8517ccf475ca6962683da7e51557cef60bddbd22
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp $";
8
9 #include <arpa/inet.h>
10 #include <assert.h>
11 #include <errno.h>
12 #include <fcntl.h>
13 #include <linux/if_tun.h>
14 #define SYSLOG_NAMES
15 #include <syslog.h>
16 #include <malloc.h>
17 #include <math.h>
18 #include <net/route.h>
19 #include <sys/mman.h>
20 #include <netdb.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
23 #include <stdarg.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <ctype.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <sys/stat.h>
31 #include <sys/time.h>
32 #include <sys/resource.h>
33 #include <sys/wait.h>
34 #include <linux/if.h>
35 #include <stddef.h>
36 #include <time.h>
37 #include <dlfcn.h>
38 #include <unistd.h>
39 #include <sched.h>
40 #include <sys/sysinfo.h>
41 #include <libcli.h>
42 #include <linux/netlink.h>
43 #include <linux/rtnetlink.h>
44
45 #include "md5.h"
46 #include "l2tpns.h"
47 #include "cluster.h"
48 #include "plugin.h"
49 #include "ll.h"
50 #include "constants.h"
51 #include "control.h"
52 #include "util.h"
53 #include "tbf.h"
54
55 #ifdef BGP
56 #include "bgp.h"
57 #endif
58
59 // Globals
60 configt *config = NULL; // all configuration
61 int nlfd = -1; // netlink socket
62 int tunfd = -1; // tun interface file handle. (network device)
63 int udpfd = -1; // UDP file handle
64 int controlfd = -1; // Control signal handle
65 int clifd = -1; // Socket listening for CLI connections.
66 int daefd = -1; // Socket listening for DAE connections.
67 int snoopfd = -1; // UDP file handle for sending out intercept data
68 int *radfds = NULL; // RADIUS requests file handles
69 int rand_fd = -1; // Random data source
70 int cluster_sockfd = -1; // Intra-cluster communications socket.
71 int epollfd = -1; // event polling
72 time_t basetime = 0; // base clock
73 char hostname[1000] = ""; // us.
74 static int tunidx; // ifr_ifindex of tun device
75 int nlseqnum = 0; // netlink sequence number
76 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
77 static int syslog_log = 0; // are we logging to syslog
78 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
79 uint32_t last_id = 0; // Unique ID for radius accounting
80 // Guest change
81 char guest_users[10][32]; // Array of guest users
82 int guest_accounts_num = 0; // Number of guest users
83
84 // calculated from config->l2tp_mtu
85 uint16_t MRU = 0; // PPP MRU
86 uint16_t MSS = 0; // TCP MSS
87
88 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
89 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
90
91 union iphash {
92 sessionidt sess;
93 union iphash *idx;
94 } ip_hash[256]; // Mapping from IP address to session structures.
95
96 struct ipv6radix {
97 sessionidt sess;
98 struct ipv6radix *branch;
99 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
100
101 // Traffic counters.
102 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
103 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
104 uint32_t eth_tx = 0;
105
106 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
107 time_t time_now = 0; // Current time in seconds since epoch.
108 static char time_now_string[64] = {0}; // Current time as a string.
109 static int time_changed = 0; // time_now changed
110 char main_quit = 0; // True if we're in the process of exiting.
111 static char main_reload = 0; // Re-load pending
112 linked_list *loaded_plugins;
113 linked_list *plugins[MAX_PLUGIN_TYPES];
114
115 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
116 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
117
118 config_descriptt config_values[] = {
119 CONFIG("debug", debug, INT),
120 CONFIG("log_file", log_filename, STRING),
121 CONFIG("pid_file", pid_file, STRING),
122 CONFIG("random_device", random_device, STRING),
123 CONFIG("l2tp_secret", l2tp_secret, STRING),
124 CONFIG("l2tp_mtu", l2tp_mtu, INT),
125 CONFIG("ppp_restart_time", ppp_restart_time, INT),
126 CONFIG("ppp_max_configure", ppp_max_configure, INT),
127 CONFIG("ppp_max_failure", ppp_max_failure, INT),
128 CONFIG("primary_dns", default_dns1, IPv4),
129 CONFIG("secondary_dns", default_dns2, IPv4),
130 CONFIG("primary_radius", radiusserver[0], IPv4),
131 CONFIG("secondary_radius", radiusserver[1], IPv4),
132 CONFIG("primary_radius_port", radiusport[0], SHORT),
133 CONFIG("secondary_radius_port", radiusport[1], SHORT),
134 CONFIG("radius_accounting", radius_accounting, BOOL),
135 CONFIG("radius_interim", radius_interim, INT),
136 CONFIG("radius_secret", radiussecret, STRING),
137 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
138 CONFIG("radius_dae_port", radius_dae_port, SHORT),
139 CONFIG("radius_bind_min", radius_bind_min, SHORT),
140 CONFIG("radius_bind_max", radius_bind_max, SHORT),
141 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
142 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
143 CONFIG("guest_account", guest_user, STRING),
144 CONFIG("bind_address", bind_address, IPv4),
145 CONFIG("peer_address", peer_address, IPv4),
146 CONFIG("send_garp", send_garp, BOOL),
147 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
148 CONFIG("throttle_buckets", num_tbfs, INT),
149 CONFIG("accounting_dir", accounting_dir, STRING),
150 CONFIG("dump_speed", dump_speed, BOOL),
151 CONFIG("multi_read_count", multi_read_count, INT),
152 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
153 CONFIG("lock_pages", lock_pages, BOOL),
154 CONFIG("icmp_rate", icmp_rate, INT),
155 CONFIG("packet_limit", max_packets, INT),
156 CONFIG("cluster_address", cluster_address, IPv4),
157 CONFIG("cluster_interface", cluster_interface, STRING),
158 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
159 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
160 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
161 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
162 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
163 { NULL, 0, 0, 0 },
164 };
165
166 static char *plugin_functions[] = {
167 NULL,
168 "plugin_pre_auth",
169 "plugin_post_auth",
170 "plugin_packet_rx",
171 "plugin_packet_tx",
172 "plugin_timer",
173 "plugin_new_session",
174 "plugin_kill_session",
175 "plugin_control",
176 "plugin_radius_response",
177 "plugin_radius_reset",
178 "plugin_radius_account",
179 "plugin_become_master",
180 "plugin_new_session_master",
181 };
182
183 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
184
185 // Counters for shutdown sessions
186 static sessiont shut_acct[8192];
187 static sessionidt shut_acct_n = 0;
188
189 tunnelt *tunnel = NULL; // Array of tunnel structures.
190 bundlet *bundle = NULL; // Array of bundle structures.
191 fragmentationt *frag = NULL; // Array of fragmentation structures.
192 sessiont *session = NULL; // Array of session structures.
193 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
194 radiust *radius = NULL; // Array of radius structures.
195 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
196 ip_filtert *ip_filters = NULL; // Array of named filters.
197 static controlt *controlfree = 0;
198 struct Tstats *_statistics = NULL;
199 #ifdef RINGBUFFER
200 struct Tringbuffer *ringbuffer = NULL;
201 #endif
202
203 static void cache_ipmap(in_addr_t ip, sessionidt s);
204 static void uncache_ipmap(in_addr_t ip);
205 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
206 static void free_ip_address(sessionidt s);
207 static void dump_acct_info(int all);
208 static void sighup_handler(int sig);
209 static void shutdown_handler(int sig);
210 static void sigchild_handler(int sig);
211 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
212 static void update_config(void);
213 static void read_config_file(void);
214 static void initplugins(void);
215 static int add_plugin(char *plugin_name);
216 static int remove_plugin(char *plugin_name);
217 static void plugins_done(void);
218 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
219 static tunnelidt new_tunnel(void);
220 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
221 static void bundleclear(bundleidt b);
222
223 // on slaves, alow BGP to withdraw cleanly before exiting
224 #define QUIT_DELAY 5
225
226 // quit actions (master)
227 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
228 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
229
230 // return internal time (10ths since process startup), set f if given
231 // as a side-effect sets time_now, and time_changed
232 static clockt now(double *f)
233 {
234 struct timeval t;
235 gettimeofday(&t, 0);
236 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
237 if (t.tv_sec != time_now)
238 {
239 time_now = t.tv_sec;
240 time_changed++;
241 }
242 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
243 }
244
245 // work out a retry time based on try number
246 // This is a straight bounded exponential backoff.
247 // Maximum re-try time is 32 seconds. (2^5).
248 clockt backoff(uint8_t try)
249 {
250 if (try > 5) try = 5; // max backoff
251 return now(NULL) + 10 * (1 << try);
252 }
253
254
255 //
256 // Log a debug message. Typically called via the LOG macro
257 //
258 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
259 {
260 static char message[65536] = {0};
261 va_list ap;
262
263 #ifdef RINGBUFFER
264 if (ringbuffer)
265 {
266 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
267 ringbuffer->tail = 0;
268 if (ringbuffer->tail == ringbuffer->head)
269 if (++ringbuffer->head >= RINGBUFFER_SIZE)
270 ringbuffer->head = 0;
271
272 ringbuffer->buffer[ringbuffer->tail].level = level;
273 ringbuffer->buffer[ringbuffer->tail].session = s;
274 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
275 va_start(ap, format);
276 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
277 va_end(ap);
278 }
279 #endif
280
281 if (config->debug < level) return;
282
283 va_start(ap, format);
284 vsnprintf(message, sizeof(message), format, ap);
285
286 if (log_stream)
287 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
288 else if (syslog_log)
289 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
290
291 va_end(ap);
292 }
293
294 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
295 {
296 int i, j;
297 const uint8_t *d = data;
298
299 if (config->debug < level) return;
300
301 // No support for _log_hex to syslog
302 if (log_stream)
303 {
304 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
305 setvbuf(log_stream, NULL, _IOFBF, 16384);
306
307 for (i = 0; i < maxsize; )
308 {
309 fprintf(log_stream, "%4X: ", i);
310 for (j = i; j < maxsize && j < (i + 16); j++)
311 {
312 fprintf(log_stream, "%02X ", d[j]);
313 if (j == i + 7)
314 fputs(": ", log_stream);
315 }
316
317 for (; j < i + 16; j++)
318 {
319 fputs(" ", log_stream);
320 if (j == i + 7)
321 fputs(": ", log_stream);
322 }
323
324 fputs(" ", log_stream);
325 for (j = i; j < maxsize && j < (i + 16); j++)
326 {
327 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
328 fputc(d[j], log_stream);
329 else
330 fputc('.', log_stream);
331
332 if (j == i + 7)
333 fputs(" ", log_stream);
334 }
335
336 i = j;
337 fputs("\n", log_stream);
338 }
339
340 fflush(log_stream);
341 setbuf(log_stream, NULL);
342 }
343 }
344
345 // update a counter, accumulating 2^32 wraps
346 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
347 {
348 uint32_t new = *counter + delta;
349 if (new < *counter)
350 (*wrap)++;
351
352 *counter = new;
353 }
354
355 // initialise the random generator
356 static void initrandom(char *source)
357 {
358 static char path[sizeof(config->random_device)] = "*undefined*";
359
360 // reinitialise only if we are forced to do so or if the config has changed
361 if (source && !strncmp(path, source, sizeof(path)))
362 return;
363
364 // close previous source, if any
365 if (rand_fd >= 0)
366 close(rand_fd);
367
368 rand_fd = -1;
369
370 if (source)
371 {
372 // register changes
373 snprintf(path, sizeof(path), "%s", source);
374
375 if (*path == '/')
376 {
377 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
378 if (rand_fd < 0)
379 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
380 path, strerror(errno));
381 }
382 }
383 }
384
385 // fill buffer with random data
386 void random_data(uint8_t *buf, int len)
387 {
388 int n = 0;
389
390 CSTAT(random_data);
391 if (rand_fd >= 0)
392 {
393 n = read(rand_fd, buf, len);
394 if (n >= len) return;
395 if (n < 0)
396 {
397 if (errno != EAGAIN)
398 {
399 LOG(0, 0, 0, "Error reading from random source: %s\n",
400 strerror(errno));
401
402 // fall back to rand()
403 initrandom(NULL);
404 }
405
406 n = 0;
407 }
408 }
409
410 // append missing data
411 while (n < len)
412 // not using the low order bits from the prng stream
413 buf[n++] = (rand() >> 4) & 0xff;
414 }
415
416 // Add a route
417 //
418 // This adds it to the routing table, advertises it
419 // via BGP if enabled, and stuffs it into the
420 // 'sessionbyip' cache.
421 //
422 // 'ip' and 'mask' must be in _host_ order.
423 //
424 static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
425 {
426 struct rtentry r;
427 int i;
428
429 if (!mask) mask = 0xffffffff;
430
431 ip &= mask; // Force the ip to be the first one in the route.
432
433 memset(&r, 0, sizeof(r));
434 r.rt_dev = config->tundevice;
435 r.rt_dst.sa_family = AF_INET;
436 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
437 r.rt_gateway.sa_family = AF_INET;
438 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
439 r.rt_genmask.sa_family = AF_INET;
440 *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
441 r.rt_flags = (RTF_UP | RTF_STATIC);
442 if (gw)
443 r.rt_flags |= RTF_GATEWAY;
444 else if (mask == 0xffffffff)
445 r.rt_flags |= RTF_HOST;
446
447 LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
448 fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
449 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
450
451 if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
452 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
453
454 #ifdef BGP
455 if (add)
456 bgp_add_route(htonl(ip), htonl(mask));
457 else
458 bgp_del_route(htonl(ip), htonl(mask));
459 #endif /* BGP */
460
461 // Add/Remove the IPs to the 'sessionbyip' cache.
462 // Note that we add the zero address in the case of
463 // a network route. Roll on CIDR.
464
465 // Note that 's == 0' implies this is the address pool.
466 // We still cache it here, because it will pre-fill
467 // the malloc'ed tree.
468
469 if (s)
470 {
471 if (!add) // Are we deleting a route?
472 s = 0; // Caching the session as '0' is the same as uncaching.
473
474 for (i = ip; (i&mask) == (ip&mask) ; ++i)
475 cache_ipmap(i, s);
476 }
477 }
478
479 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
480 {
481 struct in6_rtmsg rt;
482 char ipv6addr[INET6_ADDRSTRLEN];
483
484 if (ifr6fd < 0)
485 {
486 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
487 return;
488 }
489
490 memset(&rt, 0, sizeof(rt));
491
492 memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
493 rt.rtmsg_dst_len = prefixlen;
494 rt.rtmsg_metric = 1;
495 rt.rtmsg_flags = RTF_UP;
496 rt.rtmsg_ifindex = tunidx;
497
498 LOG(1, 0, 0, "Route %s %s/%d\n",
499 add ? "add" : "del",
500 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
501 prefixlen);
502
503 if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
504 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
505 strerror(errno));
506
507 // FIXME: need to add BGP routing (RFC2858)
508
509 if (s)
510 {
511 if (!add) // Are we deleting a route?
512 s = 0; // Caching the session as '0' is the same as uncaching.
513
514 cache_ipv6map(ip, prefixlen, s);
515 }
516
517 return;
518 }
519
520 //
521 // Set up netlink socket
522 static void initnetlink(void)
523 {
524 struct sockaddr_nl nladdr;
525
526 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
527 if (nlfd < 0)
528 {
529 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
530 exit(1);
531 }
532
533 memset(&nladdr, 0, sizeof(nladdr));
534 nladdr.nl_family = AF_NETLINK;
535 nladdr.nl_pid = getpid();
536
537 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
538 {
539 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
540 exit(1);
541 }
542 }
543
544 static ssize_t netlink_send(struct nlmsghdr *nh)
545 {
546 struct sockaddr_nl nladdr;
547 struct iovec iov;
548 struct msghdr msg;
549
550 nh->nlmsg_pid = getpid();
551 nh->nlmsg_seq = ++nlseqnum;
552
553 // set kernel address
554 memset(&nladdr, 0, sizeof(nladdr));
555 nladdr.nl_family = AF_NETLINK;
556
557 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
558 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
559
560 return sendmsg(nlfd, &msg, 0);
561 }
562
563 static ssize_t netlink_recv(void *buf, ssize_t len)
564 {
565 struct sockaddr_nl nladdr;
566 struct iovec iov;
567 struct msghdr msg;
568
569 // set kernel address
570 memset(&nladdr, 0, sizeof(nladdr));
571 nladdr.nl_family = AF_NETLINK;
572
573 iov = (struct iovec){ buf, len };
574 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
575
576 return recvmsg(nlfd, &msg, 0);
577 }
578
579 //
580 // Set up TUN interface
581 static void inittun(void)
582 {
583 struct ifinfomsg ifinfo;
584 struct ifreq ifr;
585
586 memset(&ifr, 0, sizeof(ifr));
587 ifr.ifr_flags = IFF_TUN;
588
589 tunfd = open(TUNDEVICE, O_RDWR);
590 if (tunfd < 0)
591 { // fatal
592 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
593 exit(1);
594 }
595 {
596 int flags = fcntl(tunfd, F_GETFL, 0);
597 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
598 }
599 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
600 {
601 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
602 exit(1);
603 }
604 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
605 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
606
607 {
608 // get the interface index
609 struct {
610 struct nlmsghdr nh;
611 struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
612 struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
613 char ifname[IFNAMSIZ];
614 } req;
615 char buf[4096];
616 ssize_t len;
617 struct nlmsghdr *resp_nh;
618
619 req.nh.nlmsg_type = RTM_GETLINK;
620 req.nh.nlmsg_flags = NLM_F_REQUEST;
621
622 req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
623
624 req.ifname_rta.rta_len = RTA_LENGTH(strlen(config->tundevice)+1);
625 req.ifname_rta.rta_type = IFLA_IFNAME;
626 strncpy(req.ifname, config->tundevice, IFNAMSIZ-1);
627
628 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
629 + req.ifname_rta.rta_len);
630
631 if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
632 {
633 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
634 exit(1);
635 }
636
637 resp_nh = (struct nlmsghdr *)buf;
638 if (!NLMSG_OK (resp_nh, len))
639 {
640 LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len);
641 exit(1);
642 }
643
644 memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
645 // got index
646 tunidx = ifinfo.ifi_index;
647 }
648 {
649 struct {
650 // interface setting
651 struct nlmsghdr nh;
652 union {
653 struct ifinfomsg ifinfo;
654 struct ifaddrmsg ifaddr;
655 } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
656 char rtdata[32]; // 32 should be enough
657 } req;
658 struct {
659 struct rtattr rta;
660 uint32_t u32 __attribute__ ((aligned(RTA_ALIGNTO)));;
661 } u32_attr;
662 struct {
663 struct rtattr rta;
664 struct in_addr addr __attribute__ ((aligned(RTA_ALIGNTO)));;
665 } ipv4_attr;
666 struct {
667 struct rtattr rta;
668 struct in6_addr addr6 __attribute__ ((aligned(RTA_ALIGNTO)));;
669 } ipv6_attr;
670 char *buf_ptr;
671
672 memset(&req, 0, sizeof(req));
673
674 req.nh.nlmsg_type = RTM_SETLINK;
675 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
676
677 req.ifmsg.ifinfo = ifinfo;
678 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
679 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
680
681 buf_ptr = NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifinfo);
682
683 u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
684 u32_attr.rta.rta_type = IFLA_TXQLEN;
685 /* Bump up the qlen to deal with bursts from the network */
686 u32_attr.u32 = 1000;
687 memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
688
689 buf_ptr += RTA_ALIGN(u32_attr.rta.rta_len);
690
691 u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
692 u32_attr.rta.rta_type = IFLA_MTU;
693 /* set MTU to modem MRU */
694 u32_attr.u32 = MRU;
695 memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
696
697 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo)
698 + u32_attr.rta.rta_len * 2);
699
700 if (netlink_send(&req.nh) < 0)
701 {
702 LOG(0, 0, 0, "Error setting up tun device interface: %s\n", strerror(errno));
703 exit(1);
704 }
705
706 memset(&req, 0, sizeof(req));
707
708 req.nh.nlmsg_type = RTM_NEWADDR;
709 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
710
711 req.ifmsg.ifaddr.ifa_family = AF_INET;
712 req.ifmsg.ifaddr.ifa_prefixlen = 32;
713 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
714
715 ipv4_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv4_attr.addr));
716 ipv4_attr.rta.rta_type = IFA_ADDRESS;
717 ipv4_attr.addr.s_addr = config->bind_address ?
718 config->bind_address : 0x01010101; // 1.1.1.1
719 memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv4_attr, sizeof(ipv4_attr));
720
721 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
722 + ipv4_attr.rta.rta_len);
723
724 if (netlink_send(&req.nh) < 0)
725 {
726 LOG(0, 0, 0, "Error setting up tun device IPv4 address: %s\n", strerror(errno));
727 exit(1);
728 }
729
730 // Only setup IPv6 on the tun device if we have a configured prefix
731 if (config->ipv6_prefix.s6_addr[0]) {
732 memset(&req, 0, sizeof(req));
733
734 req.nh.nlmsg_type = RTM_NEWADDR;
735 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
736
737 req.ifmsg.ifaddr.ifa_family = AF_INET6;
738 req.ifmsg.ifaddr.ifa_prefixlen = 64;
739 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
740 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
741
742 ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
743 ipv6_attr.rta.rta_type = IFA_LOCAL;
744 // Link local address is FE80::1
745 memset(&ipv6_attr.addr6, 0, sizeof(ipv6_attr.addr6));
746 ipv6_attr.addr6.s6_addr[0] = 0xFE;
747 ipv6_attr.addr6.s6_addr[1] = 0x80;
748 ipv6_attr.addr6.s6_addr[15] = 1;
749 memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
750
751 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
752 + ipv6_attr.rta.rta_len);
753
754 if (netlink_send(&req.nh) < 0)
755 {
756 LOG(0, 0, 0, "Error setting up tun device IPv6 LL address: %s\n", strerror(errno));
757 exit(1);
758 }
759
760 memset(&req, 0, sizeof(req));
761
762 req.nh.nlmsg_type = RTM_NEWADDR;
763 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
764
765 req.ifmsg.ifaddr.ifa_family = AF_INET6;
766 req.ifmsg.ifaddr.ifa_prefixlen = 64;
767 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
768 req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
769
770 ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
771 ipv6_attr.rta.rta_type = IFA_LOCAL;
772 // Global address is prefix::1
773 ipv6_attr.addr6 = config->ipv6_prefix;
774 ipv6_attr.addr6.s6_addr[15] = 1;
775 memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
776
777 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
778 + ipv6_attr.rta.rta_len);
779
780 if (netlink_send(&req.nh) < 0)
781 {
782 LOG(0, 0, 0, "Error setting up tun device IPv6 global address: %s\n", strerror(errno));
783 exit(1);
784 }
785 }
786
787 memset(&req, 0, sizeof(req));
788
789 req.nh.nlmsg_type = NLMSG_DONE;
790 req.nh.nlmsg_len = NLMSG_LENGTH(0);
791
792 if (netlink_send(&req.nh) < 0)
793 {
794 LOG(0, 0, 0, "Error finishing setting up tun device: %s\n", strerror(errno));
795 exit(1);
796 }
797
798 // if we get an error for seqnum < min_initok_nlseqnum,
799 // we must exit as initialization went wrong
800 if (config->ipv6_prefix.s6_addr[0])
801 min_initok_nlseqnum = 3 + 1; // idx + if + addr
802 else
803 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
804 }
805 }
806
807 // set up UDP ports
808 static void initudp(void)
809 {
810 int on = 1;
811 struct sockaddr_in addr;
812
813 // Tunnel
814 memset(&addr, 0, sizeof(addr));
815 addr.sin_family = AF_INET;
816 addr.sin_port = htons(L2TPPORT);
817 addr.sin_addr.s_addr = config->bind_address;
818 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
819 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
820 {
821 int flags = fcntl(udpfd, F_GETFL, 0);
822 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
823 }
824 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
825 {
826 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
827 exit(1);
828 }
829
830 // Control
831 memset(&addr, 0, sizeof(addr));
832 addr.sin_family = AF_INET;
833 addr.sin_port = htons(NSCTL_PORT);
834 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
835 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
836 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
837 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
838 {
839 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
840 exit(1);
841 }
842
843 // Dynamic Authorization Extensions to RADIUS
844 memset(&addr, 0, sizeof(addr));
845 addr.sin_family = AF_INET;
846 addr.sin_port = htons(config->radius_dae_port);
847 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
848 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
849 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
850 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
851 {
852 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
853 exit(1);
854 }
855
856 // Intercept
857 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
858 }
859
860 //
861 // Find session by IP, < 1 for not found
862 //
863 // Confusingly enough, this 'ip' must be
864 // in _network_ order. This being the common
865 // case when looking it up from IP packet headers.
866 //
867 // We actually use this cache for two things.
868 // #1. For used IP addresses, this maps to the
869 // session ID that it's used by.
870 // #2. For un-used IP addresses, this maps to the
871 // index into the pool table that contains that
872 // IP address.
873 //
874
875 static sessionidt lookup_ipmap(in_addr_t ip)
876 {
877 uint8_t *a = (uint8_t *) &ip;
878 union iphash *h = ip_hash;
879
880 if (!(h = h[*a++].idx)) return 0;
881 if (!(h = h[*a++].idx)) return 0;
882 if (!(h = h[*a++].idx)) return 0;
883
884 return h[*a].sess;
885 }
886
887 static sessionidt lookup_ipv6map(struct in6_addr ip)
888 {
889 struct ipv6radix *curnode;
890 int i;
891 int s;
892 char ipv6addr[INET6_ADDRSTRLEN];
893
894 curnode = &ipv6_hash[ip.s6_addr[0]];
895 i = 1;
896 s = curnode->sess;
897
898 while (s == 0 && i < 15 && curnode->branch != NULL)
899 {
900 curnode = &curnode->branch[ip.s6_addr[i]];
901 s = curnode->sess;
902 i++;
903 }
904
905 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
906 inet_ntop(AF_INET6, &ip, ipv6addr,
907 INET6_ADDRSTRLEN),
908 s);
909
910 return s;
911 }
912
913 sessionidt sessionbyip(in_addr_t ip)
914 {
915 sessionidt s = lookup_ipmap(ip);
916 CSTAT(sessionbyip);
917
918 if (s > 0 && s < MAXSESSION && session[s].opened)
919 return s;
920
921 return 0;
922 }
923
924 sessionidt sessionbyipv6(struct in6_addr ip)
925 {
926 sessionidt s;
927 CSTAT(sessionbyipv6);
928
929 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
930 (ip.s6_addr[0] == 0xFE &&
931 ip.s6_addr[1] == 0x80 &&
932 ip.s6_addr16[1] == 0 &&
933 ip.s6_addr16[2] == 0 &&
934 ip.s6_addr16[3] == 0)) {
935 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
936 } else {
937 s = lookup_ipv6map(ip);
938 }
939
940 if (s > 0 && s < MAXSESSION && session[s].opened)
941 return s;
942
943 return 0;
944 }
945
946 //
947 // Take an IP address in HOST byte order and
948 // add it to the sessionid by IP cache.
949 //
950 // (It's actually cached in network order)
951 //
952 static void cache_ipmap(in_addr_t ip, sessionidt s)
953 {
954 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
955 uint8_t *a = (uint8_t *) &nip;
956 union iphash *h = ip_hash;
957 int i;
958
959 for (i = 0; i < 3; i++)
960 {
961 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
962 return;
963
964 h = h[a[i]].idx;
965 }
966
967 h[a[3]].sess = s;
968
969 if (s > 0)
970 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
971
972 else if (s == 0)
973 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
974 // else a map to an ip pool index.
975 }
976
977 static void uncache_ipmap(in_addr_t ip)
978 {
979 cache_ipmap(ip, 0); // Assign it to the NULL session.
980 }
981
982 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
983 {
984 int i;
985 int bytes;
986 struct ipv6radix *curnode;
987 char ipv6addr[INET6_ADDRSTRLEN];
988
989 curnode = &ipv6_hash[ip.s6_addr[0]];
990
991 bytes = prefixlen >> 3;
992 i = 1;
993 while (i < bytes) {
994 if (curnode->branch == NULL)
995 {
996 if (!(curnode->branch = calloc(256,
997 sizeof (struct ipv6radix))))
998 return;
999 }
1000 curnode = &curnode->branch[ip.s6_addr[i]];
1001 i++;
1002 }
1003
1004 curnode->sess = s;
1005
1006 if (s > 0)
1007 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1008 inet_ntop(AF_INET6, &ip, ipv6addr,
1009 INET6_ADDRSTRLEN),
1010 prefixlen);
1011 else if (s == 0)
1012 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1013 inet_ntop(AF_INET6, &ip, ipv6addr,
1014 INET6_ADDRSTRLEN),
1015 prefixlen);
1016 }
1017
1018 //
1019 // CLI list to dump current ipcache.
1020 //
1021 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1022 {
1023 union iphash *d = ip_hash, *e, *f, *g;
1024 int i, j, k, l;
1025 int count = 0;
1026
1027 if (CLI_HELP_REQUESTED)
1028 return CLI_HELP_NO_ARGS;
1029
1030 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1031
1032 for (i = 0; i < 256; ++i)
1033 {
1034 if (!d[i].idx)
1035 continue;
1036
1037 e = d[i].idx;
1038 for (j = 0; j < 256; ++j)
1039 {
1040 if (!e[j].idx)
1041 continue;
1042
1043 f = e[j].idx;
1044 for (k = 0; k < 256; ++k)
1045 {
1046 if (!f[k].idx)
1047 continue;
1048
1049 g = f[k].idx;
1050 for (l = 0; l < 256; ++l)
1051 {
1052 if (!g[l].sess)
1053 continue;
1054
1055 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1056 ++count;
1057 }
1058 }
1059 }
1060 }
1061 cli_print(cli, "%d entries in cache", count);
1062 return CLI_OK;
1063 }
1064
1065
1066 // Find session by username, 0 for not found
1067 // walled garden users aren't authenticated, so the username is
1068 // reasonably useless. Ignore them to avoid incorrect actions
1069 //
1070 // This is VERY inefficent. Don't call it often. :)
1071 //
1072 sessionidt sessionbyuser(char *username)
1073 {
1074 int s;
1075 CSTAT(sessionbyuser);
1076
1077 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1078 {
1079 if (!session[s].opened)
1080 continue;
1081
1082 if (session[s].walled_garden)
1083 continue; // Skip walled garden users.
1084
1085 if (!strncmp(session[s].user, username, 128))
1086 return s;
1087
1088 }
1089 return 0; // Not found.
1090 }
1091
1092 void send_garp(in_addr_t ip)
1093 {
1094 int s;
1095 struct ifreq ifr;
1096 uint8_t mac[6];
1097
1098 s = socket(PF_INET, SOCK_DGRAM, 0);
1099 if (s < 0)
1100 {
1101 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1102 return;
1103 }
1104 memset(&ifr, 0, sizeof(ifr));
1105 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1106 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1107 {
1108 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1109 close(s);
1110 return;
1111 }
1112 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1113 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1114 {
1115 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1116 close(s);
1117 return;
1118 }
1119 close(s);
1120 sendarp(ifr.ifr_ifindex, mac, ip);
1121 }
1122
1123 static sessiont *sessiontbysessionidt(sessionidt s)
1124 {
1125 if (!s || s >= MAXSESSION) return NULL;
1126 return &session[s];
1127 }
1128
1129 static sessionidt sessionidtbysessiont(sessiont *s)
1130 {
1131 sessionidt val = s-session;
1132 if (s < session || val >= MAXSESSION) return 0;
1133 return val;
1134 }
1135
1136 // actually send a control message for a specific tunnel
1137 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1138 {
1139 struct sockaddr_in addr;
1140
1141 CSTAT(tunnelsend);
1142
1143 if (!t)
1144 {
1145 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1146 STAT(tunnel_tx_errors);
1147 return;
1148 }
1149
1150 if (!tunnel[t].ip)
1151 {
1152 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1153 STAT(tunnel_tx_errors);
1154 return;
1155 }
1156
1157 memset(&addr, 0, sizeof(addr));
1158 addr.sin_family = AF_INET;
1159 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1160 addr.sin_port = htons(tunnel[t].port);
1161
1162 // sequence expected, if sequence in message
1163 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1164
1165 // If this is a control message, deal with retries
1166 if (*buf & 0x80)
1167 {
1168 tunnel[t].last = time_now; // control message sent
1169 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1170 if (tunnel[t].try)
1171 {
1172 STAT(tunnel_retries);
1173 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1174 }
1175 }
1176
1177 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1178 {
1179 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1180 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1181 STAT(tunnel_tx_errors);
1182 return;
1183 }
1184
1185 LOG_HEX(5, "Send Tunnel Data", buf, l);
1186 STAT(tunnel_tx_packets);
1187 INC_STAT(tunnel_tx_bytes, l);
1188 }
1189
1190 //
1191 // Tiny helper function to write data to
1192 // the 'tun' device.
1193 //
1194 int tun_write(uint8_t * data, int size)
1195 {
1196 return write(tunfd, data, size);
1197 }
1198
1199 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1200 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1201 {
1202 int d = (tcp[12] >> 4) * 4;
1203 uint8_t *mss = 0;
1204 uint8_t *opts;
1205 uint8_t *data;
1206 uint16_t orig;
1207 uint32_t sum;
1208
1209 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1210 return;
1211
1212 if (tcp + d > buf + len) // short?
1213 return;
1214
1215 opts = tcp + 20;
1216 data = tcp + d;
1217
1218 while (opts < data)
1219 {
1220 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1221 {
1222 mss = opts + 2;
1223 if (mss + 2 > data) return; // short?
1224 break;
1225 }
1226
1227 if (*opts == 0) return; // end of options
1228 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1229 opts++;
1230 else
1231 opts += opts[1]; // skip over option
1232 }
1233
1234 if (!mss) return; // not found
1235 orig = ntohs(*(uint16_t *) mss);
1236
1237 if (orig <= MSS) return; // mss OK
1238
1239 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1240 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1241 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1242 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1243
1244 // set mss
1245 *(int16_t *) mss = htons(MSS);
1246
1247 // adjust checksum (see rfc1141)
1248 sum = orig + (~MSS & 0xffff);
1249 sum += ntohs(*(uint16_t *) (tcp + 16));
1250 sum = (sum & 0xffff) + (sum >> 16);
1251 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1252 }
1253
1254 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1255 {
1256 uint16_t proto;
1257 if (extra) {
1258 // Skip the four extra bytes
1259 p += 4;
1260 l -= 4;
1261 }
1262
1263 if (*p & 1)
1264 {
1265 proto = *p++;
1266 l--;
1267 }
1268 else
1269 {
1270 proto = ntohs(*(uint16_t *) p);
1271 p += 2;
1272 l -= 2;
1273 }
1274 if (proto == PPPIP)
1275 {
1276 if (session[s].die)
1277 {
1278 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1279 return; // closing session, PPP not processed
1280 }
1281 session[s].last_packet = session[s].last_data = time_now;
1282 processipin(s, t, p, l);
1283 }
1284 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1285 {
1286 if (session[s].die)
1287 {
1288 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1289 return; // closing session, PPP not processed
1290 }
1291
1292 session[s].last_packet = session[s].last_data = time_now;
1293 processipv6in(s, t, p, l);
1294 }
1295 else if (proto == PPPIPCP)
1296 {
1297 session[s].last_packet = session[s].last_data = time_now;
1298 processipcp(s, t, p, l);
1299 }
1300 else if (proto == PPPCCP)
1301 {
1302 session[s].last_packet = session[s].last_data = time_now;
1303 processccp(s, t, p, l);
1304 }
1305 else
1306 {
1307 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1308 }
1309 }
1310
1311 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1312 {
1313 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1314 sp->cout_delta += len;
1315 sp->pout++;
1316 sp->last_data = time_now;
1317
1318 sess_local[s].cout += len; // To send to master..
1319 sess_local[s].pout++;
1320 }
1321
1322 // process outgoing (to tunnel) IP
1323 //
1324 static void processipout(uint8_t *buf, int len)
1325 {
1326 sessionidt s;
1327 sessiont *sp;
1328 tunnelidt t;
1329 in_addr_t ip;
1330
1331 uint8_t *data = buf; // Keep a copy of the originals.
1332 int size = len;
1333
1334 uint8_t fragbuf[MAXETHER + 20];
1335
1336 CSTAT(processipout);
1337
1338 if (len < MIN_IP_SIZE)
1339 {
1340 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1341 STAT(tun_rx_errors);
1342 return;
1343 }
1344 if (len >= MAXETHER)
1345 {
1346 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1347 STAT(tun_rx_errors);
1348 return;
1349 }
1350
1351 // Skip the tun header
1352 buf += 4;
1353 len -= 4;
1354
1355 // Got an IP header now
1356 if (*(uint8_t *)(buf) >> 4 != 4)
1357 {
1358 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1359 return;
1360 }
1361
1362 ip = *(uint32_t *)(buf + 16);
1363 if (!(s = sessionbyip(ip)))
1364 {
1365 // Is this a packet for a session that doesn't exist?
1366 static int rate = 0; // Number of ICMP packets we've sent this second.
1367 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1368
1369 if (last != time_now)
1370 {
1371 last = time_now;
1372 rate = 0;
1373 }
1374
1375 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1376 {
1377 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1378 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1379 config->bind_address ? config->bind_address : my_address, buf, len);
1380 }
1381 return;
1382 }
1383
1384 t = session[s].tunnel;
1385 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1386 {
1387 LOG(3, s, t, "Packet size more than session MRU\n");
1388 return;
1389 }
1390
1391 sp = &session[s];
1392
1393 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1394 if (config->max_packets > 0)
1395 {
1396 if (sess_local[s].last_packet_out == TIME)
1397 {
1398 int max = config->max_packets;
1399
1400 // All packets for throttled sessions are handled by the
1401 // master, so further limit by using the throttle rate.
1402 // A bit of a kludge, since throttle rate is in kbps,
1403 // but should still be generous given our average DSL
1404 // packet size is 200 bytes: a limit of 28kbps equates
1405 // to around 180 packets per second.
1406 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1407 max = sp->throttle_out;
1408
1409 if (++sess_local[s].packets_out > max)
1410 {
1411 sess_local[s].packets_dropped++;
1412 return;
1413 }
1414 }
1415 else
1416 {
1417 if (sess_local[s].packets_dropped)
1418 {
1419 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1420 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1421 sess_local[s].packets_dropped, sess_local[s].packets_out,
1422 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1423 sp->user);
1424 }
1425
1426 sess_local[s].last_packet_out = TIME;
1427 sess_local[s].packets_out = 1;
1428 sess_local[s].packets_dropped = 0;
1429 }
1430 }
1431
1432 // run access-list if any
1433 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1434 return;
1435
1436 // adjust MSS on SYN and SYN,ACK packets with options
1437 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1438 {
1439 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1440 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1441 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1442 }
1443
1444 if (sp->tbf_out)
1445 {
1446 // Are we throttling this session?
1447 if (config->cluster_iam_master)
1448 tbf_queue_packet(sp->tbf_out, data, size);
1449 else
1450 master_throttle_packet(sp->tbf_out, data, size);
1451 return;
1452 }
1453
1454 if (sp->walled_garden && !config->cluster_iam_master)
1455 {
1456 // We are walled-gardening this
1457 master_garden_packet(s, data, size);
1458 return;
1459 }
1460
1461 // Add on L2TP header
1462 {
1463 bundleidt bid = 0;
1464 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1465 {
1466 bid = session[s].bundle;
1467 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1468 t = session[s].tunnel;
1469 sp = &session[s];
1470 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1471 if(len > MINFRAGLEN)
1472 {
1473 // Partition the packet to "bundle[b].num_of_links" fragments
1474 bundlet *b = &bundle[bid];
1475 uint32_t num_of_links = b->num_of_links;
1476 uint32_t fraglen = len / num_of_links;
1477 fraglen = (fraglen > session[s].mru ? session[s].mru : fraglen);
1478 uint32_t last_fraglen = fraglen + len % num_of_links;
1479 last_fraglen = (last_fraglen > session[s].mru ? len % num_of_links : last_fraglen);
1480 uint32_t remain = len;
1481
1482 // send the first packet
1483 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1484 if (!p) return;
1485 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1486 // statistics
1487 update_session_out_stat(s, sp, fraglen);
1488 remain -= fraglen;
1489 while (remain > last_fraglen)
1490 {
1491 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1492 t = session[s].tunnel;
1493 sp = &session[s];
1494 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1495 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1496 if (!p) return;
1497 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1498 update_session_out_stat(s, sp, fraglen);
1499 remain -= fraglen;
1500 }
1501 // send the last fragment
1502 s = b->members[b->current_ses = ++b->current_ses % num_of_links];
1503 t = session[s].tunnel;
1504 sp = &session[s];
1505 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1506 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1507 if (!p) return;
1508 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1509 update_session_out_stat(s, sp, remain);
1510 if (remain != last_fraglen)
1511 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1512 }
1513 else {
1514 // Send it as one frame
1515 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1516 if (!p) return;
1517 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1518 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1519 update_session_out_stat(s, sp, len);
1520 }
1521 }
1522 else
1523 {
1524 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1525 if (!p) return;
1526 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1527 update_session_out_stat(s, sp, len);
1528 }
1529 }
1530
1531 // Snooping this session, send it to intercept box
1532 if (sp->snoop_ip && sp->snoop_port)
1533 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1534
1535 udp_tx += len;
1536 }
1537
1538 // process outgoing (to tunnel) IPv6
1539 //
1540 static void processipv6out(uint8_t * buf, int len)
1541 {
1542 sessionidt s;
1543 sessiont *sp;
1544 tunnelidt t;
1545 in_addr_t ip;
1546 struct in6_addr ip6;
1547
1548 uint8_t *data = buf; // Keep a copy of the originals.
1549 int size = len;
1550
1551 uint8_t b[MAXETHER + 20];
1552
1553 CSTAT(processipv6out);
1554
1555 if (len < MIN_IP_SIZE)
1556 {
1557 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1558 STAT(tunnel_tx_errors);
1559 return;
1560 }
1561 if (len >= MAXETHER)
1562 {
1563 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1564 STAT(tunnel_tx_errors);
1565 return;
1566 }
1567
1568 // Skip the tun header
1569 buf += 4;
1570 len -= 4;
1571
1572 // Got an IP header now
1573 if (*(uint8_t *)(buf) >> 4 != 6)
1574 {
1575 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1576 return;
1577 }
1578
1579 ip6 = *(struct in6_addr *)(buf+24);
1580 s = sessionbyipv6(ip6);
1581
1582 if (s == 0)
1583 {
1584 ip = *(uint32_t *)(buf + 32);
1585 s = sessionbyip(ip);
1586 }
1587
1588 if (s == 0)
1589 {
1590 // Is this a packet for a session that doesn't exist?
1591 static int rate = 0; // Number of ICMP packets we've sent this second.
1592 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1593
1594 if (last != time_now)
1595 {
1596 last = time_now;
1597 rate = 0;
1598 }
1599
1600 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1601 {
1602 // FIXME: Should send icmp6 host unreachable
1603 }
1604 return;
1605 }
1606 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1607 {
1608 bundleidt bid = session[s].bundle;
1609 s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
1610 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1611 }
1612 t = session[s].tunnel;
1613 sp = &session[s];
1614 sp->last_data = time_now;
1615
1616 // FIXME: add DoS prevention/filters?
1617
1618 if (sp->tbf_out)
1619 {
1620 // Are we throttling this session?
1621 if (config->cluster_iam_master)
1622 tbf_queue_packet(sp->tbf_out, data, size);
1623 else
1624 master_throttle_packet(sp->tbf_out, data, size);
1625 return;
1626 }
1627 else if (sp->walled_garden && !config->cluster_iam_master)
1628 {
1629 // We are walled-gardening this
1630 master_garden_packet(s, data, size);
1631 return;
1632 }
1633
1634 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1635
1636 // Add on L2TP header
1637 {
1638 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1639 if (!p) return;
1640 tunnelsend(b, len + (p-b), t); // send it...
1641 }
1642
1643 // Snooping this session, send it to intercept box
1644 if (sp->snoop_ip && sp->snoop_port)
1645 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1646
1647 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1648 sp->cout_delta += len;
1649 sp->pout++;
1650 udp_tx += len;
1651
1652 sess_local[s].cout += len; // To send to master..
1653 sess_local[s].pout++;
1654 }
1655
1656 //
1657 // Helper routine for the TBF filters.
1658 // Used to send queued data in to the user!
1659 //
1660 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1661 {
1662 sessiont *sp;
1663 tunnelidt t;
1664 in_addr_t ip;
1665
1666 uint8_t b[MAXETHER + 20];
1667
1668 if (len < 0 || len > MAXETHER)
1669 {
1670 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1671 return;
1672 }
1673
1674 // Skip the tun header
1675 buf += 4;
1676 len -= 4;
1677
1678 ip = *(in_addr_t *)(buf + 16);
1679
1680 if (!session[s].ip)
1681 return;
1682
1683 t = session[s].tunnel;
1684 sp = &session[s];
1685
1686 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1687
1688 // Add on L2TP header
1689 {
1690 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1691 if (!p) return;
1692 tunnelsend(b, len + (p-b), t); // send it...
1693 }
1694
1695 // Snooping this session.
1696 if (sp->snoop_ip && sp->snoop_port)
1697 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1698
1699 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1700 sp->cout_delta += len;
1701 sp->pout++;
1702 udp_tx += len;
1703
1704 sess_local[s].cout += len; // To send to master..
1705 sess_local[s].pout++;
1706 }
1707
1708 // add an AVP (16 bit)
1709 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1710 {
1711 uint16_t l = (m ? 0x8008 : 0x0008);
1712 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1713 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1714 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1715 *(uint16_t *) (c->buf + c->length + 6) = htons(val);
1716 c->length += 8;
1717 }
1718
1719 // add an AVP (32 bit)
1720 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1721 {
1722 uint16_t l = (m ? 0x800A : 0x000A);
1723 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1724 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1725 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1726 *(uint32_t *) (c->buf + c->length + 6) = htonl(val);
1727 c->length += 10;
1728 }
1729
1730 // add an AVP (string)
1731 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1732 {
1733 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1734 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1735 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1736 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1737 memcpy(c->buf + c->length + 6, val, strlen(val));
1738 c->length += 6 + strlen(val);
1739 }
1740
1741 // add a binary AVP
1742 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1743 {
1744 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1745 *(uint16_t *) (c->buf + c->length + 0) = htons(l);
1746 *(uint16_t *) (c->buf + c->length + 2) = htons(0);
1747 *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
1748 memcpy(c->buf + c->length + 6, val, len);
1749 c->length += 6 + len;
1750 }
1751
1752 // new control connection
1753 static controlt *controlnew(uint16_t mtype)
1754 {
1755 controlt *c;
1756 if (!controlfree)
1757 c = malloc(sizeof(controlt));
1758 else
1759 {
1760 c = controlfree;
1761 controlfree = c->next;
1762 }
1763 assert(c);
1764 c->next = 0;
1765 *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
1766 c->length = 12;
1767 control16(c, 0, mtype, 1);
1768 return c;
1769 }
1770
1771 // send zero block if nothing is waiting
1772 // (ZLB send).
1773 static void controlnull(tunnelidt t)
1774 {
1775 uint8_t buf[12];
1776 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1777 return;
1778
1779 *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
1780 *(uint16_t *) (buf + 2) = htons(12); // length
1781 *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
1782 *(uint16_t *) (buf + 6) = htons(0); // session
1783 *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
1784 *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
1785 tunnelsend(buf, 12, t);
1786 }
1787
1788 // add a control message to a tunnel, and send if within window
1789 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1790 {
1791 *(uint16_t *) (c->buf + 2) = htons(c->length); // length
1792 *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
1793 *(uint16_t *) (c->buf + 6) = htons(far); // session
1794 *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
1795 tunnel[t].ns++; // advance sequence
1796 // link in message in to queue
1797 if (tunnel[t].controlc)
1798 tunnel[t].controle->next = c;
1799 else
1800 tunnel[t].controls = c;
1801
1802 tunnel[t].controle = c;
1803 tunnel[t].controlc++;
1804
1805 // send now if space in window
1806 if (tunnel[t].controlc <= tunnel[t].window)
1807 {
1808 tunnel[t].try = 0; // first send
1809 tunnelsend(c->buf, c->length, t);
1810 }
1811 }
1812
1813 //
1814 // Throttle or Unthrottle a session
1815 //
1816 // Throttle the data from/to through a session to no more than
1817 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1818 // user).
1819 //
1820 // If either value is -1, the current value is retained for that
1821 // direction.
1822 //
1823 void throttle_session(sessionidt s, int rate_in, int rate_out)
1824 {
1825 if (!session[s].opened)
1826 return; // No-one home.
1827
1828 if (!*session[s].user)
1829 return; // User not logged in
1830
1831 if (rate_in >= 0)
1832 {
1833 int bytes = rate_in * 1024 / 8; // kbits to bytes
1834 if (session[s].tbf_in)
1835 free_tbf(session[s].tbf_in);
1836
1837 if (rate_in > 0)
1838 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1839 else
1840 session[s].tbf_in = 0;
1841
1842 session[s].throttle_in = rate_in;
1843 }
1844
1845 if (rate_out >= 0)
1846 {
1847 int bytes = rate_out * 1024 / 8;
1848 if (session[s].tbf_out)
1849 free_tbf(session[s].tbf_out);
1850
1851 if (rate_out > 0)
1852 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1853 else
1854 session[s].tbf_out = 0;
1855
1856 session[s].throttle_out = rate_out;
1857 }
1858 }
1859
1860 // add/remove filters from session (-1 = no change)
1861 void filter_session(sessionidt s, int filter_in, int filter_out)
1862 {
1863 if (!session[s].opened)
1864 return; // No-one home.
1865
1866 if (!*session[s].user)
1867 return; // User not logged in
1868
1869 // paranoia
1870 if (filter_in > MAXFILTER) filter_in = -1;
1871 if (filter_out > MAXFILTER) filter_out = -1;
1872 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1873 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1874
1875 if (filter_in >= 0)
1876 {
1877 if (session[s].filter_in)
1878 ip_filters[session[s].filter_in - 1].used--;
1879
1880 if (filter_in > 0)
1881 ip_filters[filter_in - 1].used++;
1882
1883 session[s].filter_in = filter_in;
1884 }
1885
1886 if (filter_out >= 0)
1887 {
1888 if (session[s].filter_out)
1889 ip_filters[session[s].filter_out - 1].used--;
1890
1891 if (filter_out > 0)
1892 ip_filters[filter_out - 1].used++;
1893
1894 session[s].filter_out = filter_out;
1895 }
1896 }
1897
1898 // start tidy shutdown of session
1899 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1900 {
1901 int walled_garden = session[s].walled_garden;
1902 bundleidt b = session[s].bundle;
1903 //delete routes only for last session in bundle (in case of MPPP)
1904 int del_routes = !b || (bundle[b].num_of_links == 1);
1905
1906 CSTAT(sessionshutdown);
1907
1908 if (!session[s].opened)
1909 {
1910 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
1911 return; // not a live session
1912 }
1913
1914 if (!session[s].die)
1915 {
1916 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
1917 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
1918 run_plugins(PLUGIN_KILL_SESSION, &data);
1919 session[s].die = TIME + 150; // Clean up in 15 seconds
1920 }
1921
1922 if (session[s].ip && !walled_garden && !session[s].die)
1923 {
1924 // RADIUS Stop message
1925 uint16_t r = radiusnew(s);
1926 if (r)
1927 {
1928 // stop, if not already trying
1929 if (radius[r].state != RADIUSSTOP)
1930 {
1931 radius[r].term_cause = term_cause;
1932 radius[r].term_msg = reason;
1933 radiussend(r, RADIUSSTOP);
1934 }
1935 }
1936 else
1937 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
1938
1939 // Save counters to dump to accounting file
1940 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
1941 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
1942 }
1943
1944 if (session[s].ip)
1945 { // IP allocated, clear and unroute
1946 int r;
1947 int routed = 0;
1948 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
1949 {
1950 if ((session[s].ip & session[s].route[r].mask) ==
1951 (session[s].route[r].ip & session[s].route[r].mask))
1952 routed++;
1953
1954 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
1955 session[s].route[r].ip = 0;
1956 }
1957
1958 if (session[s].ip_pool_index == -1) // static ip
1959 {
1960 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
1961 session[s].ip = 0;
1962 }
1963 else
1964 free_ip_address(s);
1965
1966 // unroute IPv6, if setup
1967 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
1968 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
1969
1970 if (b)
1971 {
1972 // This session was part of a bundle
1973 bundle[b].num_of_links--;
1974 LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
1975 if(bundle[b].num_of_links == 0)
1976 {
1977 bundleclear(b);
1978 LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
1979 }
1980 else
1981 {
1982 // Adjust the members array to accomodate the new change
1983 uint8_t mem_num = 0;
1984 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1985 if(bundle[b].members[bundle[b].num_of_links] != s)
1986 {
1987 uint8_t ml;
1988 for(ml = 0; ml<bundle[b].num_of_links; ml++)
1989 if(bundle[b].members[ml] == s)
1990 {
1991 mem_num = ml;
1992 break;
1993 }
1994 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
1995 LOG(3, s, 0, "MPPP: Adjusted member links array\n");
1996 }
1997 }
1998 cluster_send_bundle(b);
1999 }
2000 }
2001
2002 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2003 throttle_session(s, 0, 0);
2004
2005 if (cdn_result)
2006 { // Send CDN
2007 controlt *c = controlnew(14); // sending CDN
2008 if (cdn_error)
2009 {
2010 uint8_t buf[4];
2011 *(uint16_t *) buf = htons(cdn_result);
2012 *(uint16_t *) (buf+2) = htons(cdn_error);
2013 controlb(c, 1, buf, 4, 1);
2014 }
2015 else
2016 control16(c, 1, cdn_result, 1);
2017
2018 control16(c, 14, s, 1); // assigned session (our end)
2019 controladd(c, session[s].far, session[s].tunnel); // send the message
2020 }
2021
2022 // update filter refcounts
2023 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2024 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2025
2026 // clear PPP state
2027 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2028 sess_local[s].lcp.restart = 0;
2029 sess_local[s].ipcp.restart = 0;
2030 sess_local[s].ipv6cp.restart = 0;
2031 sess_local[s].ccp.restart = 0;
2032
2033 cluster_send_session(s);
2034 }
2035
2036 void sendipcp(sessionidt s, tunnelidt t)
2037 {
2038 uint8_t buf[MAXETHER];
2039 uint8_t *q;
2040
2041 CSTAT(sendipcp);
2042 LOG(3, s, t, "IPCP: send ConfigReq\n");
2043
2044 if (!session[s].unique_id)
2045 {
2046 if (!++last_id) ++last_id; // skip zero
2047 session[s].unique_id = last_id;
2048 }
2049
2050 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2051 if (!q) return;
2052
2053 *q = ConfigReq;
2054 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2055 *(uint16_t *) (q + 2) = htons(10); // packet length
2056 q[4] = 3; // ip address option
2057 q[5] = 6; // option length
2058 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2059 config->bind_address ? config->bind_address :
2060 my_address; // send my IP
2061
2062 tunnelsend(buf, 10 + (q - buf), t); // send it
2063 restart_timer(s, ipcp);
2064 }
2065
2066 void sendipv6cp(sessionidt s, tunnelidt t)
2067 {
2068 uint8_t buf[MAXETHER];
2069 uint8_t *q;
2070
2071 CSTAT(sendipv6cp);
2072 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2073
2074 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2075 if (!q) return;
2076
2077 *q = ConfigReq;
2078 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2079 // only send one type
2080 // of request
2081 *(uint16_t *) (q + 2) = htons(14);
2082 q[4] = 1; // interface identifier option
2083 q[5] = 10; // option length
2084 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2085 *(uint32_t *) (q + 10) = 0;
2086 q[13] = 1;
2087
2088 tunnelsend(buf, 14 + (q - buf), t); // send it
2089 restart_timer(s, ipv6cp);
2090 }
2091
2092 static void sessionclear(sessionidt s)
2093 {
2094 memset(&session[s], 0, sizeof(session[s]));
2095 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2096 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2097
2098 session[s].tunnel = T_FREE; // Mark it as free.
2099 session[s].next = sessionfree;
2100 sessionfree = s;
2101 }
2102
2103 // kill a session now
2104 void sessionkill(sessionidt s, char *reason)
2105 {
2106 CSTAT(sessionkill);
2107
2108 if (!session[s].opened) // not alive
2109 return;
2110
2111 if (session[s].next)
2112 {
2113 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2114 return;
2115 }
2116
2117 if (!session[s].die)
2118 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2119
2120 if (sess_local[s].radius)
2121 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2122
2123 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2124 sessionclear(s);
2125 cluster_send_session(s);
2126 }
2127
2128 static void tunnelclear(tunnelidt t)
2129 {
2130 if (!t) return;
2131 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2132 tunnel[t].state = TUNNELFREE;
2133 }
2134
2135 static void bundleclear(bundleidt b)
2136 {
2137 if (!b) return;
2138 memset(&bundle[b], 0, sizeof(bundle[b]));
2139 bundle[b].state = BUNDLEFREE;
2140 }
2141
2142 // kill a tunnel now
2143 static void tunnelkill(tunnelidt t, char *reason)
2144 {
2145 sessionidt s;
2146 controlt *c;
2147
2148 CSTAT(tunnelkill);
2149
2150 tunnel[t].state = TUNNELDIE;
2151
2152 // free control messages
2153 while ((c = tunnel[t].controls))
2154 {
2155 controlt * n = c->next;
2156 tunnel[t].controls = n;
2157 tunnel[t].controlc--;
2158 c->next = controlfree;
2159 controlfree = c;
2160 }
2161 // kill sessions
2162 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2163 if (session[s].tunnel == t)
2164 sessionkill(s, reason);
2165
2166 // free tunnel
2167 tunnelclear(t);
2168 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2169 cli_tunnel_actions[t].action = 0;
2170 cluster_send_tunnel(t);
2171 }
2172
2173 // shut down a tunnel cleanly
2174 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2175 {
2176 sessionidt s;
2177
2178 CSTAT(tunnelshutdown);
2179
2180 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2181 {
2182 // never set up, can immediately kill
2183 tunnelkill(t, reason);
2184 return;
2185 }
2186 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2187
2188 // close session
2189 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2190 if (session[s].tunnel == t)
2191 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2192
2193 tunnel[t].state = TUNNELDIE;
2194 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2195 cluster_send_tunnel(t);
2196 // TBA - should we wait for sessions to stop?
2197 if (result)
2198 {
2199 controlt *c = controlnew(4); // sending StopCCN
2200 if (error)
2201 {
2202 uint8_t buf[64];
2203 int l = 4;
2204 *(uint16_t *) buf = htons(result);
2205 *(uint16_t *) (buf+2) = htons(error);
2206 if (msg)
2207 {
2208 int m = strlen(msg);
2209 if (m + 4 > sizeof(buf))
2210 m = sizeof(buf) - 4;
2211
2212 memcpy(buf+4, msg, m);
2213 l += m;
2214 }
2215
2216 controlb(c, 1, buf, l, 1);
2217 }
2218 else
2219 control16(c, 1, result, 1);
2220
2221 control16(c, 9, t, 1); // assigned tunnel (our end)
2222 controladd(c, 0, t); // send the message
2223 }
2224 }
2225
2226 // read and process packet on tunnel (UDP)
2227 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2228 {
2229 uint8_t *chapresponse = NULL;
2230 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2231 uint8_t *p = buf + 2;
2232
2233
2234 CSTAT(processudp);
2235
2236 udp_rx += len;
2237 udp_rx_pkt++;
2238 LOG_HEX(5, "UDP Data", buf, len);
2239 STAT(tunnel_rx_packets);
2240 INC_STAT(tunnel_rx_bytes, len);
2241 if (len < 6)
2242 {
2243 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2244 STAT(tunnel_rx_errors);
2245 return;
2246 }
2247 if ((buf[1] & 0x0F) != 2)
2248 {
2249 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2250 STAT(tunnel_rx_errors);
2251 return;
2252 }
2253 if (*buf & 0x40)
2254 { // length
2255 l = ntohs(*(uint16_t *) p);
2256 p += 2;
2257 }
2258 t = ntohs(*(uint16_t *) p);
2259 p += 2;
2260 s = ntohs(*(uint16_t *) p);
2261 p += 2;
2262 if (s >= MAXSESSION)
2263 {
2264 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2265 STAT(tunnel_rx_errors);
2266 return;
2267 }
2268 if (t >= MAXTUNNEL)
2269 {
2270 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2271 STAT(tunnel_rx_errors);
2272 return;
2273 }
2274 if (*buf & 0x08)
2275 { // ns/nr
2276 ns = ntohs(*(uint16_t *) p);
2277 p += 2;
2278 nr = ntohs(*(uint16_t *) p);
2279 p += 2;
2280 }
2281 if (*buf & 0x02)
2282 { // offset
2283 uint16_t o = ntohs(*(uint16_t *) p);
2284 p += o + 2;
2285 }
2286 if ((p - buf) > l)
2287 {
2288 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2289 STAT(tunnel_rx_errors);
2290 return;
2291 }
2292 l -= (p - buf);
2293
2294 // used to time out old tunnels
2295 if (t && tunnel[t].state == TUNNELOPEN)
2296 tunnel[t].lastrec = time_now;
2297
2298 if (*buf & 0x80)
2299 { // control
2300 uint16_t message = 0xFFFF; // message type
2301 uint8_t fatal = 0;
2302 uint8_t mandatory = 0;
2303 uint16_t asession = 0; // assigned session
2304 uint32_t amagic = 0; // magic number
2305 uint8_t aflags = 0; // flags from last LCF
2306 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2307 char called[MAXTEL] = ""; // called number
2308 char calling[MAXTEL] = ""; // calling number
2309
2310 if (!config->cluster_iam_master)
2311 {
2312 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2313 return;
2314 }
2315
2316 // control messages must have bits 0x80|0x40|0x08
2317 // (type, length and sequence) set, and bits 0x02|0x01
2318 // (offset and priority) clear
2319 if ((*buf & 0xCB) != 0xC8)
2320 {
2321 LOG(1, s, t, "Bad control header %02X\n", *buf);
2322 STAT(tunnel_rx_errors);
2323 return;
2324 }
2325
2326 // check for duplicate tunnel open message
2327 if (!t && ns == 0)
2328 {
2329 int i;
2330
2331 //
2332 // Is this a duplicate of the first packet? (SCCRQ)
2333 //
2334 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2335 {
2336 if (tunnel[i].state != TUNNELOPENING ||
2337 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2338 tunnel[i].port != ntohs(addr->sin_port) )
2339 continue;
2340 t = i;
2341 LOG(3, s, t, "Duplicate SCCRQ?\n");
2342 break;
2343 }
2344 }
2345
2346 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2347 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2348
2349 // if no tunnel specified, assign one
2350 if (!t)
2351 {
2352 if (!(t = new_tunnel()))
2353 {
2354 LOG(1, 0, 0, "No more tunnels\n");
2355 STAT(tunnel_overflow);
2356 return;
2357 }
2358 tunnelclear(t);
2359 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2360 tunnel[t].port = ntohs(addr->sin_port);
2361 tunnel[t].window = 4; // default window
2362 STAT(tunnel_created);
2363 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2364 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2365 }
2366
2367 // If the 'ns' just received is not the 'nr' we're
2368 // expecting, just send an ack and drop it.
2369 //
2370 // if 'ns' is less, then we got a retransmitted packet.
2371 // if 'ns' is greater than missed a packet. Either way
2372 // we should ignore it.
2373 if (ns != tunnel[t].nr)
2374 {
2375 // is this the sequence we were expecting?
2376 STAT(tunnel_rx_errors);
2377 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2378 t, ns, tunnel[t].nr);
2379
2380 if (l) // Is this not a ZLB?
2381 controlnull(t);
2382 return;
2383 }
2384
2385 // check sequence of this message
2386 {
2387 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2388 // some to clear maybe?
2389 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2390 {
2391 controlt *c = tunnel[t].controls;
2392 tunnel[t].controls = c->next;
2393 tunnel[t].controlc--;
2394 c->next = controlfree;
2395 controlfree = c;
2396 skip--;
2397 tunnel[t].try = 0; // we have progress
2398 }
2399
2400 // receiver advance (do here so quoted correctly in any sends below)
2401 if (l) tunnel[t].nr = (ns + 1);
2402 if (skip < 0) skip = 0;
2403 if (skip < tunnel[t].controlc)
2404 {
2405 // some control packets can now be sent that were previous stuck out of window
2406 int tosend = tunnel[t].window - skip;
2407 controlt *c = tunnel[t].controls;
2408 while (c && skip)
2409 {
2410 c = c->next;
2411 skip--;
2412 }
2413 while (c && tosend)
2414 {
2415 tunnel[t].try = 0; // first send
2416 tunnelsend(c->buf, c->length, t);
2417 c = c->next;
2418 tosend--;
2419 }
2420 }
2421 if (!tunnel[t].controlc)
2422 tunnel[t].retry = 0; // caught up
2423 }
2424 if (l)
2425 { // if not a null message
2426 int result = 0;
2427 int error = 0;
2428 char *msg = 0;
2429
2430 // Default disconnect cause/message on receipt of CDN. Set to
2431 // more specific value from attribute 1 (result code) or 46
2432 // (disconnect cause) if present below.
2433 int disc_cause_set = 0;
2434 int disc_cause = TERM_NAS_REQUEST;
2435 char const *disc_reason = "Closed (Received CDN).";
2436
2437 // process AVPs
2438 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2439 {
2440 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2441 uint8_t *b = p;
2442 uint8_t flags = *p;
2443 uint16_t mtype;
2444
2445 if (n > l)
2446 {
2447 LOG(1, s, t, "Invalid length in AVP\n");
2448 STAT(tunnel_rx_errors);
2449 return;
2450 }
2451 p += n; // next
2452 l -= n;
2453 if (flags & 0x3C) // reserved bits, should be clear
2454 {
2455 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2456 fatal = flags;
2457 result = 2; // general error
2458 error = 3; // reserved field non-zero
2459 msg = 0;
2460 continue; // next
2461 }
2462 b += 2;
2463 if (*(uint16_t *) (b))
2464 {
2465 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2466 fatal = flags;
2467 result = 2; // general error
2468 error = 6; // generic vendor-specific error
2469 msg = "unsupported vendor-specific";
2470 continue; // next
2471 }
2472 b += 2;
2473 mtype = ntohs(*(uint16_t *) (b));
2474 b += 2;
2475 n -= 6;
2476
2477 if (flags & 0x40)
2478 {
2479 uint16_t orig_len;
2480
2481 // handle hidden AVPs
2482 if (!*config->l2tp_secret)
2483 {
2484 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2485 fatal = flags;
2486 result = 2; // general error
2487 error = 6; // generic vendor-specific error
2488 msg = "secret not specified";
2489 continue;
2490 }
2491 if (!session[s].random_vector_length)
2492 {
2493 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2494 fatal = flags;
2495 result = 2; // general error
2496 error = 6; // generic
2497 msg = "no random vector";
2498 continue;
2499 }
2500 if (n < 8)
2501 {
2502 LOG(2, s, t, "Short hidden AVP.\n");
2503 fatal = flags;
2504 result = 2; // general error
2505 error = 2; // length is wrong
2506 msg = 0;
2507 continue;
2508 }
2509
2510 // Unhide the AVP
2511 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2512
2513 orig_len = ntohs(*(uint16_t *) b);
2514 if (orig_len > n + 2)
2515 {
2516 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2517 orig_len, n);
2518
2519 fatal = flags;
2520 result = 2; // general error
2521 error = 2; // length is wrong
2522 msg = 0;
2523 continue;
2524 }
2525
2526 b += 2;
2527 n = orig_len;
2528 }
2529
2530 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2531 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2532
2533 switch (mtype)
2534 {
2535 case 0: // message type
2536 message = ntohs(*(uint16_t *) b);
2537 mandatory = flags & 0x80;
2538 LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
2539 break;
2540 case 1: // result code
2541 {
2542 uint16_t rescode = ntohs(*(uint16_t *) b);
2543 char const *resdesc = "(unknown)";
2544 char const *errdesc = NULL;
2545 int cause = 0;
2546
2547 if (message == 4)
2548 { /* StopCCN */
2549 resdesc = l2tp_stopccn_result_code(rescode);
2550 cause = TERM_LOST_SERVICE;
2551 }
2552 else if (message == 14)
2553 { /* CDN */
2554 resdesc = l2tp_cdn_result_code(rescode);
2555 if (rescode == 1)
2556 cause = TERM_LOST_CARRIER;
2557 else
2558 cause = TERM_ADMIN_RESET;
2559 }
2560
2561 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2562 if (n >= 4)
2563 {
2564 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2565 errdesc = l2tp_error_code(errcode);
2566 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2567 }
2568 if (n > 4)
2569 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2570
2571 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2572 {
2573 disc_cause_set = mtype;
2574 disc_reason = errdesc ? errdesc : resdesc;
2575 disc_cause = cause;
2576 }
2577
2578 break;
2579 }
2580 break;
2581 case 2: // protocol version
2582 {
2583 version = ntohs(*(uint16_t *) (b));
2584 LOG(4, s, t, " Protocol version = %u\n", version);
2585 if (version && version != 0x0100)
2586 { // allow 0.0 and 1.0
2587 LOG(1, s, t, " Bad protocol version %04X\n", version);
2588 fatal = flags;
2589 result = 5; // unspported protocol version
2590 error = 0x0100; // supported version
2591 msg = 0;
2592 continue; // next
2593 }
2594 }
2595 break;
2596 case 3: // framing capabilities
2597 break;
2598 case 4: // bearer capabilities
2599 break;
2600 case 5: // tie breaker
2601 // We never open tunnels, so we don't care about tie breakers
2602 continue;
2603 case 6: // firmware revision
2604 break;
2605 case 7: // host name
2606 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2607 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2608 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2609 // TBA - to send to RADIUS
2610 break;
2611 case 8: // vendor name
2612 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2613 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2614 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2615 break;
2616 case 9: // assigned tunnel
2617 tunnel[t].far = ntohs(*(uint16_t *) (b));
2618 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2619 break;
2620 case 10: // rx window
2621 tunnel[t].window = ntohs(*(uint16_t *) (b));
2622 if (!tunnel[t].window)
2623 tunnel[t].window = 1; // window of 0 is silly
2624 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2625 break;
2626 case 11: // Challenge
2627 {
2628 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2629 build_chap_response(b, 2, n, &chapresponse);
2630 }
2631 break;
2632 case 13: // Response
2633 // Why did they send a response? We never challenge.
2634 LOG(2, s, t, " received unexpected challenge response\n");
2635 break;
2636
2637 case 14: // assigned session
2638 asession = session[s].far = ntohs(*(uint16_t *) (b));
2639 LOG(4, s, t, " assigned session = %u\n", asession);
2640 break;
2641 case 15: // call serial number
2642 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2643 break;
2644 case 18: // bearer type
2645 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2646 // TBA - for RADIUS
2647 break;
2648 case 19: // framing type
2649 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2650 // TBA
2651 break;
2652 case 21: // called number
2653 memset(called, 0, sizeof(called));
2654 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2655 LOG(4, s, t, " Called <%s>\n", called);
2656 break;
2657 case 22: // calling number
2658 memset(calling, 0, sizeof(calling));
2659 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2660 LOG(4, s, t, " Calling <%s>\n", calling);
2661 break;
2662 case 23: // subtype
2663 break;
2664 case 24: // tx connect speed
2665 if (n == 4)
2666 {
2667 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2668 }
2669 else
2670 {
2671 // AS5300s send connect speed as a string
2672 char tmp[30];
2673 memset(tmp, 0, sizeof(tmp));
2674 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2675 session[s].tx_connect_speed = atol(tmp);
2676 }
2677 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2678 break;
2679 case 38: // rx connect speed
2680 if (n == 4)
2681 {
2682 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2683 }
2684 else
2685 {
2686 // AS5300s send connect speed as a string
2687 char tmp[30];
2688 memset(tmp, 0, sizeof(tmp));
2689 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2690 session[s].rx_connect_speed = atol(tmp);
2691 }
2692 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2693 break;
2694 case 25: // Physical Channel ID
2695 {
2696 uint32_t tmp = ntohl(*(uint32_t *) b);
2697 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2698 break;
2699 }
2700 case 29: // Proxy Authentication Type
2701 {
2702 uint16_t atype = ntohs(*(uint16_t *)b);
2703 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2704 break;
2705 }
2706 case 30: // Proxy Authentication Name
2707 {
2708 char authname[64];
2709 memset(authname, 0, sizeof(authname));
2710 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2711 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2712 authname);
2713 break;
2714 }
2715 case 31: // Proxy Authentication Challenge
2716 {
2717 LOG(4, s, t, " Proxy Auth Challenge\n");
2718 break;
2719 }
2720 case 32: // Proxy Authentication ID
2721 {
2722 uint16_t authid = ntohs(*(uint16_t *)(b));
2723 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2724 break;
2725 }
2726 case 33: // Proxy Authentication Response
2727 LOG(4, s, t, " Proxy Auth Response\n");
2728 break;
2729 case 27: // last sent lcp
2730 { // find magic number
2731 uint8_t *p = b, *e = p + n;
2732 while (p + 1 < e && p[1] && p + p[1] <= e)
2733 {
2734 if (*p == 5 && p[1] == 6) // Magic-Number
2735 amagic = ntohl(*(uint32_t *) (p + 2));
2736 else if (*p == 7) // Protocol-Field-Compression
2737 aflags |= SESSION_PFC;
2738 else if (*p == 8) // Address-and-Control-Field-Compression
2739 aflags |= SESSION_ACFC;
2740 p += p[1];
2741 }
2742 }
2743 break;
2744 case 28: // last recv lcp confreq
2745 break;
2746 case 26: // Initial Received LCP CONFREQ
2747 break;
2748 case 39: // seq required - we control it as an LNS anyway...
2749 break;
2750 case 36: // Random Vector
2751 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2752 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2753 if (n > sizeof(session[s].random_vector))
2754 n = sizeof(session[s].random_vector);
2755 memcpy(session[s].random_vector, b, n);
2756 session[s].random_vector_length = n;
2757 break;
2758 case 46: // ppp disconnect cause
2759 if (n >= 5)
2760 {
2761 uint16_t code = ntohs(*(uint16_t *) b);
2762 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2763 uint8_t dir = *(b + 4);
2764
2765 LOG(4, s, t, " PPP disconnect cause "
2766 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2767 code, proto, dir, n - 5, b + 5);
2768
2769 disc_cause_set = mtype;
2770
2771 switch (code)
2772 {
2773 case 1: // admin disconnect
2774 disc_cause = TERM_ADMIN_RESET;
2775 disc_reason = "Administrative disconnect";
2776 break;
2777 case 3: // lcp terminate
2778 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2779 disc_cause = TERM_USER_REQUEST;
2780 disc_reason = "Normal disconnection";
2781 break;
2782 case 4: // compulsory encryption unavailable
2783 if (dir != 1) break; // 1=refused by peer, 2=local
2784 disc_cause = TERM_USER_ERROR;
2785 disc_reason = "Compulsory encryption refused";
2786 break;
2787 case 5: // lcp: fsm timeout
2788 disc_cause = TERM_PORT_ERROR;
2789 disc_reason = "LCP: FSM timeout";
2790 break;
2791 case 6: // lcp: no recognisable lcp packets received
2792 disc_cause = TERM_PORT_ERROR;
2793 disc_reason = "LCP: no recognisable LCP packets";
2794 break;
2795 case 7: // lcp: magic-no error (possibly looped back)
2796 disc_cause = TERM_PORT_ERROR;
2797 disc_reason = "LCP: magic-no error (possible loop)";
2798 break;
2799 case 8: // lcp: echo request timeout
2800 disc_cause = TERM_PORT_ERROR;
2801 disc_reason = "LCP: echo request timeout";
2802 break;
2803 case 13: // auth: fsm timeout
2804 disc_cause = TERM_SERVICE_UNAVAILABLE;
2805 disc_reason = "Authentication: FSM timeout";
2806 break;
2807 case 15: // auth: unacceptable auth protocol
2808 disc_cause = TERM_SERVICE_UNAVAILABLE;
2809 disc_reason = "Unacceptable authentication protocol";
2810 break;
2811 case 16: // auth: authentication failed
2812 disc_cause = TERM_SERVICE_UNAVAILABLE;
2813 disc_reason = "Authentication failed";
2814 break;
2815 case 17: // ncp: fsm timeout
2816 disc_cause = TERM_SERVICE_UNAVAILABLE;
2817 disc_reason = "NCP: FSM timeout";
2818 break;
2819 case 18: // ncp: no ncps available
2820 disc_cause = TERM_SERVICE_UNAVAILABLE;
2821 disc_reason = "NCP: no NCPs available";
2822 break;
2823 case 19: // ncp: failure to converge on acceptable address
2824 disc_cause = TERM_SERVICE_UNAVAILABLE;
2825 disc_reason = (dir == 1)
2826 ? "NCP: too many Configure-Naks received from peer"
2827 : "NCP: too many Configure-Naks sent to peer";
2828 break;
2829 case 20: // ncp: user not permitted to use any address
2830 disc_cause = TERM_SERVICE_UNAVAILABLE;
2831 disc_reason = (dir == 1)
2832 ? "NCP: local link address not acceptable to peer"
2833 : "NCP: remote link address not acceptable";
2834 break;
2835 }
2836 }
2837 break;
2838 default:
2839 {
2840 static char e[] = "unknown AVP 0xXXXX";
2841 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2842 fatal = flags;
2843 result = 2; // general error
2844 error = 8; // unknown mandatory AVP
2845 sprintf((msg = e) + 14, "%04x", mtype);
2846 continue; // next
2847 }
2848 }
2849 }
2850 // process message
2851 if (fatal & 0x80)
2852 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2853 else
2854 switch (message)
2855 {
2856 case 1: // SCCRQ - Start Control Connection Request
2857 tunnel[t].state = TUNNELOPENING;
2858 if (main_quit != QUIT_SHUTDOWN)
2859 {
2860 controlt *c = controlnew(2); // sending SCCRP
2861 control16(c, 2, version, 1); // protocol version
2862 control32(c, 3, 3, 1); // framing
2863 controls(c, 7, hostname, 1); // host name
2864 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
2865 control16(c, 9, t, 1); // assigned tunnel
2866 controladd(c, 0, t); // send the resply
2867 }
2868 else
2869 {
2870 tunnelshutdown(t, "Shutting down", 6, 0, 0);
2871 }
2872 break;
2873 case 2: // SCCRP
2874 tunnel[t].state = TUNNELOPEN;
2875 tunnel[t].lastrec = time_now;
2876 break;
2877 case 3: // SCCN
2878 tunnel[t].state = TUNNELOPEN;
2879 tunnel[t].lastrec = time_now;
2880 controlnull(t); // ack
2881 break;
2882 case 4: // StopCCN
2883 controlnull(t); // ack
2884 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
2885 break;
2886 case 6: // HELLO
2887 controlnull(t); // simply ACK
2888 break;
2889 case 7: // OCRQ
2890 // TBA
2891 break;
2892 case 8: // OCRO
2893 // TBA
2894 break;
2895 case 9: // OCCN
2896 // TBA
2897 break;
2898 case 10: // ICRQ
2899 if (sessionfree && main_quit != QUIT_SHUTDOWN)
2900 {
2901 controlt *c = controlnew(11); // ICRP
2902
2903 s = sessionfree;
2904 sessionfree = session[s].next;
2905 memset(&session[s], 0, sizeof(session[s]));
2906
2907 if (s > config->cluster_highest_sessionid)
2908 config->cluster_highest_sessionid = s;
2909
2910 session[s].opened = time_now;
2911 session[s].tunnel = t;
2912 session[s].far = asession;
2913 session[s].last_packet = session[s].last_data = time_now;
2914 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
2915 control16(c, 14, s, 1); // assigned session
2916 controladd(c, asession, t); // send the reply
2917
2918 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
2919 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
2920
2921 session[s].ppp.phase = Establish;
2922 session[s].ppp.lcp = Starting;
2923
2924 STAT(session_created);
2925 break;
2926 }
2927
2928 {
2929 controlt *c = controlnew(14); // CDN
2930 if (!sessionfree)
2931 {
2932 STAT(session_overflow);
2933 LOG(1, 0, t, "No free sessions\n");
2934 control16(c, 1, 4, 0); // temporary lack of resources
2935 }
2936 else
2937 control16(c, 1, 2, 7); // shutting down, try another
2938
2939 controladd(c, asession, t); // send the message
2940 }
2941 return;
2942 case 11: // ICRP
2943 // TBA
2944 break;
2945 case 12: // ICCN
2946 if (amagic == 0) amagic = time_now;
2947 session[s].magic = amagic; // set magic number
2948 session[s].flags = aflags; // set flags received
2949 session[s].mru = PPPoE_MRU; // default
2950 controlnull(t); // ack
2951
2952 // start LCP
2953 sess_local[s].lcp_authtype = config->radius_authprefer;
2954 sess_local[s].ppp_mru = MRU;
2955
2956 // Set multilink options before sending initial LCP packet
2957 sess_local[s].mp_mrru = 1614;
2958 sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
2959
2960 sendlcp(s, t);
2961 change_state(s, lcp, RequestSent);
2962 break;
2963
2964 case 14: // CDN
2965 controlnull(t); // ack
2966 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
2967 break;
2968 case 0xFFFF:
2969 LOG(1, s, t, "Missing message type\n");
2970 break;
2971 default:
2972 STAT(tunnel_rx_errors);
2973 if (mandatory)
2974 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
2975 else
2976 LOG(1, s, t, "Unknown message type %u\n", message);
2977 break;
2978 }
2979 if (chapresponse) free(chapresponse);
2980 cluster_send_tunnel(t);
2981 }
2982 else
2983 {
2984 LOG(4, s, t, " Got a ZLB ack\n");
2985 }
2986 }
2987 else
2988 { // data
2989 uint16_t proto;
2990
2991 LOG_HEX(5, "Receive Tunnel Data", p, l);
2992 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
2993 { // HDLC address header, discard
2994 p += 2;
2995 l -= 2;
2996 }
2997 if (l < 2)
2998 {
2999 LOG(1, s, t, "Short ppp length %d\n", l);
3000 STAT(tunnel_rx_errors);
3001 return;
3002 }
3003 if (*p & 1)
3004 {
3005 proto = *p++;
3006 l--;
3007 }
3008 else
3009 {
3010 proto = ntohs(*(uint16_t *) p);
3011 p += 2;
3012 l -= 2;
3013 }
3014
3015 if (s && !session[s].opened) // Is something wrong??
3016 {
3017 if (!config->cluster_iam_master)
3018 {
3019 // Pass it off to the master to deal with..
3020 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3021 return;
3022 }
3023
3024
3025 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3026 STAT(tunnel_rx_errors);
3027 return;
3028 }
3029
3030 if (proto == PPPPAP)
3031 {
3032 session[s].last_packet = time_now;
3033 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3034 processpap(s, t, p, l);
3035 }
3036 else if (proto == PPPCHAP)
3037 {
3038 session[s].last_packet = time_now;
3039 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3040 processchap(s, t, p, l);
3041 }
3042 else if (proto == PPPLCP)
3043 {
3044 session[s].last_packet = time_now;
3045 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3046 processlcp(s, t, p, l);
3047 }
3048 else if (proto == PPPIPCP)
3049 {
3050 session[s].last_packet = time_now;
3051 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3052 processipcp(s, t, p, l);
3053 }
3054 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3055 {
3056 session[s].last_packet = time_now;
3057 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3058 processipv6cp(s, t, p, l);
3059 }
3060 else if (proto == PPPCCP)
3061 {
3062 session[s].last_packet = time_now;
3063 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3064 processccp(s, t, p, l);
3065 }
3066 else if (proto == PPPIP)
3067 {
3068 if (session[s].die)
3069 {
3070 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3071 return; // closing session, PPP not processed
3072 }
3073
3074 session[s].last_packet = session[s].last_data = time_now;
3075 if (session[s].walled_garden && !config->cluster_iam_master)
3076 {
3077 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3078 return;
3079 }
3080
3081 processipin(s, t, p, l);
3082 }
3083 else if (proto == PPPMP)
3084 {
3085 if (session[s].die)
3086 {
3087 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3088 return; // closing session, PPP not processed
3089 }
3090
3091 session[s].last_packet = session[s].last_data = time_now;
3092 if (session[s].walled_garden && !config->cluster_iam_master)
3093 {
3094 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3095 return;
3096 }
3097
3098 processmpin(s, t, p, l);
3099 }
3100 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3101 {
3102 if (session[s].die)
3103 {
3104 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3105 return; // closing session, PPP not processed
3106 }
3107
3108 session[s].last_packet = session[s].last_data = time_now;
3109 if (session[s].walled_garden && !config->cluster_iam_master)
3110 {
3111 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3112 return;
3113 }
3114
3115 processipv6in(s, t, p, l);
3116 }
3117 else if (session[s].ppp.lcp == Opened)
3118 {
3119 session[s].last_packet = time_now;
3120 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3121 protoreject(s, t, p, l, proto);
3122 }
3123 else
3124 {
3125 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3126 proto, ppp_state(session[s].ppp.lcp));
3127 }
3128 }
3129 }
3130
3131 // read and process packet on tun
3132 static void processtun(uint8_t * buf, int len)
3133 {
3134 LOG_HEX(5, "Receive TUN Data", buf, len);
3135 STAT(tun_rx_packets);
3136 INC_STAT(tun_rx_bytes, len);
3137
3138 CSTAT(processtun);
3139
3140 eth_rx_pkt++;
3141 eth_rx += len;
3142 if (len < 22)
3143 {
3144 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3145 STAT(tun_rx_errors);
3146 return;
3147 }
3148
3149 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3150 processipout(buf, len);
3151 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3152 && config->ipv6_prefix.s6_addr[0])
3153 processipv6out(buf, len);
3154
3155 // Else discard.
3156 }
3157
3158 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3159 // that we look at the whole of the tunnel, radius and session tables
3160 // every second
3161 static void regular_cleanups(double period)
3162 {
3163 // Next tunnel, radius and session to check for actions on.
3164 static tunnelidt t = 0;
3165 static int r = 0;
3166 static sessionidt s = 0;
3167
3168 int t_actions = 0;
3169 int r_actions = 0;
3170 int s_actions = 0;
3171
3172 int t_slice;
3173 int r_slice;
3174 int s_slice;
3175
3176 int i;
3177 int a;
3178
3179 // divide up tables into slices based on the last run
3180 t_slice = config->cluster_highest_tunnelid * period;
3181 r_slice = (MAXRADIUS - 1) * period;
3182 s_slice = config->cluster_highest_sessionid * period;
3183
3184 if (t_slice < 1)
3185 t_slice = 1;
3186 else if (t_slice > config->cluster_highest_tunnelid)
3187 t_slice = config->cluster_highest_tunnelid;
3188
3189 if (r_slice < 1)
3190 r_slice = 1;
3191 else if (r_slice > (MAXRADIUS - 1))
3192 r_slice = MAXRADIUS - 1;
3193
3194 if (s_slice < 1)
3195 s_slice = 1;
3196 else if (s_slice > config->cluster_highest_sessionid)
3197 s_slice = config->cluster_highest_sessionid;
3198
3199 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3200
3201 for (i = 0; i < t_slice; i++)
3202 {
3203 t++;
3204 if (t > config->cluster_highest_tunnelid)
3205 t = 1;
3206
3207 // check for expired tunnels
3208 if (tunnel[t].die && tunnel[t].die <= TIME)
3209 {
3210 STAT(tunnel_timeout);
3211 tunnelkill(t, "Expired");
3212 t_actions++;
3213 continue;
3214 }
3215 // check for message resend
3216 if (tunnel[t].retry && tunnel[t].controlc)
3217 {
3218 // resend pending messages as timeout on reply
3219 if (tunnel[t].retry <= TIME)
3220 {
3221 controlt *c = tunnel[t].controls;
3222 uint16_t w = tunnel[t].window;
3223 tunnel[t].try++; // another try
3224 if (tunnel[t].try > 5)
3225 tunnelkill(t, "Timeout on control message"); // game over
3226 else
3227 while (c && w--)
3228 {
3229 tunnelsend(c->buf, c->length, t);
3230 c = c->next;
3231 }
3232
3233 t_actions++;
3234 }
3235 }
3236 // Send hello
3237 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3238 {
3239 controlt *c = controlnew(6); // sending HELLO
3240 controladd(c, 0, t); // send the message
3241 LOG(3, 0, t, "Sending HELLO message\n");
3242 t_actions++;
3243 }
3244
3245 // Check for tunnel changes requested from the CLI
3246 if ((a = cli_tunnel_actions[t].action))
3247 {
3248 cli_tunnel_actions[t].action = 0;
3249 if (a & CLI_TUN_KILL)
3250 {
3251 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3252 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3253 t_actions++;
3254 }
3255 }
3256 }
3257
3258 for (i = 0; i < r_slice; i++)
3259 {
3260 r++;
3261 if (r >= MAXRADIUS)
3262 r = 1;
3263
3264 if (!radius[r].state)
3265 continue;
3266
3267 if (radius[r].retry <= TIME)
3268 {
3269 radiusretry(r);
3270 r_actions++;
3271 }
3272 }
3273
3274 for (i = 0; i < s_slice; i++)
3275 {
3276 s++;
3277 if (s > config->cluster_highest_sessionid)
3278 s = 1;
3279
3280 if (!session[s].opened) // Session isn't in use
3281 continue;
3282
3283 // check for expired sessions
3284 if (session[s].die)
3285 {
3286 if (session[s].die <= TIME)
3287 {
3288 sessionkill(s, "Expired");
3289 s_actions++;
3290 }
3291 continue;
3292 }
3293
3294 // PPP timeouts
3295 if (sess_local[s].lcp.restart <= time_now)
3296 {
3297 int next_state = session[s].ppp.lcp;
3298 switch (session[s].ppp.lcp)
3299 {
3300 case RequestSent:
3301 case AckReceived:
3302 next_state = RequestSent;
3303
3304 case AckSent:
3305 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3306 {
3307 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3308 sendlcp(s, session[s].tunnel);
3309 change_state(s, lcp, next_state);
3310 }
3311 else
3312 {
3313 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3314 STAT(session_timeout);
3315 }
3316
3317 s_actions++;
3318 }
3319
3320 if (session[s].die)
3321 continue;
3322 }
3323
3324 if (sess_local[s].ipcp.restart <= time_now)
3325 {
3326 int next_state = session[s].ppp.ipcp;
3327 switch (session[s].ppp.ipcp)
3328 {
3329 case RequestSent:
3330 case AckReceived:
3331 next_state = RequestSent;
3332
3333 case AckSent:
3334 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3335 {
3336 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3337 sendipcp(s, session[s].tunnel);
3338 change_state(s, ipcp, next_state);
3339 }
3340 else
3341 {
3342 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3343 STAT(session_timeout);
3344 }
3345
3346 s_actions++;
3347 }
3348
3349 if (session[s].die)
3350 continue;
3351 }
3352
3353 if (sess_local[s].ipv6cp.restart <= time_now)
3354 {
3355 int next_state = session[s].ppp.ipv6cp;
3356 switch (session[s].ppp.ipv6cp)
3357 {
3358 case RequestSent:
3359 case AckReceived:
3360 next_state = RequestSent;
3361
3362 case AckSent:
3363 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3364 {
3365 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3366 sendipv6cp(s, session[s].tunnel);
3367 change_state(s, ipv6cp, next_state);
3368 }
3369 else
3370 {
3371 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3372 change_state(s, ipv6cp, Stopped);
3373 }
3374
3375 s_actions++;
3376 }
3377 }
3378
3379 if (sess_local[s].ccp.restart <= time_now)
3380 {
3381 int next_state = session[s].ppp.ccp;
3382 switch (session[s].ppp.ccp)
3383 {
3384 case RequestSent:
3385 case AckReceived:
3386 next_state = RequestSent;
3387
3388 case AckSent:
3389 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3390 {
3391 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3392 sendccp(s, session[s].tunnel);
3393 change_state(s, ccp, next_state);
3394 }
3395 else
3396 {
3397 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3398 change_state(s, ccp, Stopped);
3399 }
3400
3401 s_actions++;
3402 }
3403 }
3404
3405 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3406 if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
3407 {
3408 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3409 STAT(session_timeout);
3410 s_actions++;
3411 continue;
3412 }
3413
3414 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3415 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
3416 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3417 {
3418 uint8_t b[MAXETHER];
3419
3420 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3421 if (!q) continue;
3422
3423 *q = EchoReq;
3424 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3425 *(uint16_t *)(q + 2) = htons(8); // Length
3426 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3427
3428 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3429 (int)(time_now - session[s].last_packet));
3430 tunnelsend(b, 24, session[s].tunnel); // send it
3431 sess_local[s].last_echo = time_now;
3432 s_actions++;
3433 }
3434
3435 // Drop sessions who have reached session_timeout seconds
3436 if (session[s].session_timeout)
3437 {
3438 bundleidt bid = session[s].bundle;
3439 if (bid)
3440 {
3441 if (time_now - bundle[bid].last_check >= 1)
3442 {
3443 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3444 bundle[bid].last_check = time_now;
3445 if (bundle[bid].online_time >= session[s].session_timeout)
3446 {
3447 int ses;
3448 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3449 {
3450 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3451 s_actions++;
3452 continue;
3453 }
3454 }
3455 }
3456 }
3457 else if (time_now - session[s].opened >= session[s].session_timeout)
3458 {
3459 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3460 s_actions++;
3461 continue;
3462 }
3463 }
3464
3465 // Drop sessions who have reached idle_timeout seconds
3466 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3467 {
3468 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3469 STAT(session_timeout);
3470 s_actions++;
3471 continue;
3472 }
3473
3474 // Check for actions requested from the CLI
3475 if ((a = cli_session_actions[s].action))
3476 {
3477 int send = 0;
3478
3479 cli_session_actions[s].action = 0;
3480 if (a & CLI_SESS_KILL)
3481 {
3482 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3483 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3484 a = 0; // dead, no need to check for other actions
3485 s_actions++;
3486 }
3487
3488 if (a & CLI_SESS_NOSNOOP)
3489 {
3490 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3491 session[s].snoop_ip = 0;
3492 session[s].snoop_port = 0;
3493 s_actions++;
3494 send++;
3495 }
3496 else if (a & CLI_SESS_SNOOP)
3497 {
3498 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3499 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3500 cli_session_actions[s].snoop_port);
3501
3502 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3503 session[s].snoop_port = cli_session_actions[s].snoop_port;
3504 s_actions++;
3505 send++;
3506 }
3507
3508 if (a & CLI_SESS_NOTHROTTLE)
3509 {
3510 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3511 throttle_session(s, 0, 0);
3512 s_actions++;
3513 send++;
3514 }
3515 else if (a & CLI_SESS_THROTTLE)
3516 {
3517 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3518 cli_session_actions[s].throttle_in,
3519 cli_session_actions[s].throttle_out);
3520
3521 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3522 s_actions++;
3523 send++;
3524 }
3525
3526 if (a & CLI_SESS_NOFILTER)
3527 {
3528 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3529 filter_session(s, 0, 0);
3530 s_actions++;
3531 send++;
3532 }
3533 else if (a & CLI_SESS_FILTER)
3534 {
3535 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3536 cli_session_actions[s].filter_in,
3537 cli_session_actions[s].filter_out);
3538
3539 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3540 s_actions++;
3541 send++;
3542 }
3543
3544 if (send)
3545 cluster_send_session(s);
3546 }
3547
3548 // RADIUS interim accounting
3549 if (config->radius_accounting && config->radius_interim > 0
3550 && session[s].ip && !session[s].walled_garden
3551 && !sess_local[s].radius // RADIUS already in progress
3552 && time_now - sess_local[s].last_interim >= config->radius_interim
3553 && session[s].flags & SESSION_STARTED)
3554 {
3555 int rad = radiusnew(s);
3556 if (!rad)
3557 {
3558 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3559 STAT(radius_overflow);
3560 continue;
3561 }
3562
3563 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3564 session[s].user, session[s].unique_id);
3565
3566 radiussend(rad, RADIUSINTERIM);
3567 sess_local[s].last_interim = time_now;
3568 s_actions++;
3569 }
3570 }
3571
3572 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3573 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3574 }
3575
3576 //
3577 // Are we in the middle of a tunnel update, or radius
3578 // requests??
3579 //
3580 static int still_busy(void)
3581 {
3582 int i;
3583 static clockt last_talked = 0;
3584 static clockt start_busy_wait = 0;
3585
3586 if (!config->cluster_iam_master)
3587 {
3588 #ifdef BGP
3589 static time_t stopped_bgp = 0;
3590 if (bgp_configured)
3591 {
3592 if (!stopped_bgp)
3593 {
3594 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3595
3596 for (i = 0; i < BGP_NUM_PEERS; i++)
3597 if (bgp_peers[i].state == Established)
3598 bgp_stop(&bgp_peers[i]);
3599
3600 stopped_bgp = time_now;
3601
3602 // we don't want to become master
3603 cluster_send_ping(0);
3604
3605 return 1;
3606 }
3607
3608 if (time_now < (stopped_bgp + QUIT_DELAY))
3609 return 1;
3610 }
3611 #endif /* BGP */
3612
3613 return 0;
3614 }
3615
3616 if (main_quit == QUIT_SHUTDOWN)
3617 {
3618 static int dropped = 0;
3619 if (!dropped)
3620 {
3621 int i;
3622
3623 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3624 for (i = 1; i < MAXTUNNEL; i++)
3625 if (tunnel[i].ip || tunnel[i].state)
3626 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3627
3628 dropped = 1;
3629 }
3630 }
3631
3632 if (start_busy_wait == 0)
3633 start_busy_wait = TIME;
3634
3635 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3636 {
3637 if (!tunnel[i].controlc)
3638 continue;
3639
3640 if (last_talked != TIME)
3641 {
3642 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3643 last_talked = TIME;
3644 }
3645 return 1;
3646 }
3647
3648 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3649 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3650 {
3651 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3652 return 0;
3653 }
3654
3655 for (i = 1; i < MAXRADIUS; i++)
3656 {
3657 if (radius[i].state == RADIUSNULL)
3658 continue;
3659 if (radius[i].state == RADIUSWAIT)
3660 continue;
3661
3662 if (last_talked != TIME)
3663 {
3664 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3665 last_talked = TIME;
3666 }
3667 return 1;
3668 }
3669
3670 return 0;
3671 }
3672
3673 #ifdef HAVE_EPOLL
3674 # include <sys/epoll.h>
3675 #else
3676 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3677 # include "fake_epoll.h"
3678 #endif
3679
3680 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3681 #define BASE_FDS 7
3682
3683 // additional polled fds
3684 #ifdef BGP
3685 # define EXTRA_FDS BGP_NUM_PEERS
3686 #else
3687 # define EXTRA_FDS 0
3688 #endif
3689
3690 // main loop - gets packets on tun or udp and processes them
3691 static void mainloop(void)
3692 {
3693 int i;
3694 uint8_t buf[65536];
3695 clockt next_cluster_ping = 0; // send initial ping immediately
3696 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3697 int maxevent = sizeof(events)/sizeof(*events);
3698
3699 if ((epollfd = epoll_create(maxevent)) < 0)
3700 {
3701 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3702 exit(1);
3703 }
3704
3705 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3706 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3707
3708 /* setup our fds to poll for input */
3709 {
3710 static struct event_data d[BASE_FDS];
3711 struct epoll_event e;
3712
3713 e.events = EPOLLIN;
3714 i = 0;
3715
3716 if (clifd >= 0)
3717 {
3718 d[i].type = FD_TYPE_CLI;
3719 e.data.ptr = &d[i++];
3720 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3721 }
3722
3723 d[i].type = FD_TYPE_CLUSTER;
3724 e.data.ptr = &d[i++];
3725 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3726
3727 d[i].type = FD_TYPE_TUN;
3728 e.data.ptr = &d[i++];
3729 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3730
3731 d[i].type = FD_TYPE_UDP;
3732 e.data.ptr = &d[i++];
3733 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3734
3735 d[i].type = FD_TYPE_CONTROL;
3736 e.data.ptr = &d[i++];
3737 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3738
3739 d[i].type = FD_TYPE_DAE;
3740 e.data.ptr = &d[i++];
3741 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3742
3743 d[i].type = FD_TYPE_NETLINK;
3744 e.data.ptr = &d[i++];
3745 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3746 }
3747
3748 #ifdef BGP
3749 signal(SIGPIPE, SIG_IGN);
3750 bgp_setup(config->as_number);
3751 if (config->bind_address)
3752 bgp_add_route(config->bind_address, 0xffffffff);
3753
3754 for (i = 0; i < BGP_NUM_PEERS; i++)
3755 {
3756 if (config->neighbour[i].name[0])
3757 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3758 config->neighbour[i].as, config->neighbour[i].keepalive,
3759 config->neighbour[i].hold, 0); /* 0 = routing disabled */
3760 }
3761 #endif /* BGP */
3762
3763 while (!main_quit || still_busy())
3764 {
3765 int more = 0;
3766 int n;
3767
3768
3769 if (main_reload)
3770 {
3771 main_reload = 0;
3772 read_config_file();
3773 config->reload_config++;
3774 }
3775
3776 if (config->reload_config)
3777 {
3778 config->reload_config = 0;
3779 update_config();
3780 }
3781
3782 #ifdef BGP
3783 bgp_set_poll();
3784 #endif /* BGP */
3785
3786 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
3787 STAT(select_called);
3788
3789 TIME = now(NULL);
3790 if (n < 0)
3791 {
3792 if (errno == EINTR ||
3793 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
3794 continue;
3795
3796 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
3797 break; // exit
3798 }
3799
3800 if (n)
3801 {
3802 struct sockaddr_in addr;
3803 struct in_addr local;
3804 socklen_t alen;
3805 int c, s;
3806 int udp_ready = 0;
3807 int tun_ready = 0;
3808 int cluster_ready = 0;
3809 int udp_pkts = 0;
3810 int tun_pkts = 0;
3811 int cluster_pkts = 0;
3812 #ifdef BGP
3813 uint32_t bgp_events[BGP_NUM_PEERS];
3814 memset(bgp_events, 0, sizeof(bgp_events));
3815 #endif /* BGP */
3816
3817 for (c = n, i = 0; i < c; i++)
3818 {
3819 struct event_data *d = events[i].data.ptr;
3820
3821 switch (d->type)
3822 {
3823 case FD_TYPE_CLI: // CLI connections
3824 {
3825 int cli;
3826
3827 alen = sizeof(addr);
3828 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
3829 {
3830 cli_do(cli);
3831 close(cli);
3832 }
3833 else
3834 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
3835
3836 n--;
3837 break;
3838 }
3839
3840 // these are handled below, with multiple interleaved reads
3841 case FD_TYPE_CLUSTER: cluster_ready++; break;
3842 case FD_TYPE_TUN: tun_ready++; break;
3843 case FD_TYPE_UDP: udp_ready++; break;
3844
3845 case FD_TYPE_CONTROL: // nsctl commands
3846 alen = sizeof(addr);
3847 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3848 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
3849 n--;
3850 break;
3851
3852 case FD_TYPE_DAE: // DAE requests
3853 alen = sizeof(addr);
3854 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
3855 if (s > 0) processdae(buf, s, &addr, alen, &local);
3856 n--;
3857 break;
3858
3859 case FD_TYPE_RADIUS: // RADIUS response
3860 alen = sizeof(addr);
3861 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
3862 if (s >= 0 && config->cluster_iam_master)
3863 {
3864 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
3865 addr.sin_addr.s_addr == config->radiusserver[1])
3866 processrad(buf, s, d->index);
3867 else
3868 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3869 fmtaddr(addr.sin_addr.s_addr, 0));
3870 }
3871
3872 n--;
3873 break;
3874
3875 #ifdef BGP
3876 case FD_TYPE_BGP:
3877 bgp_events[d->index] = events[i].events;
3878 n--;
3879 break;
3880 #endif /* BGP */
3881
3882 case FD_TYPE_NETLINK:
3883 {
3884 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
3885 s = netlink_recv(buf, sizeof(buf));
3886 if (nh->nlmsg_type == NLMSG_ERROR)
3887 {
3888 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
3889 if (errmsg->error && errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
3890 {
3891 LOG(0, 0, 0, "Got a fatal netlink error: seq %d flags %d code %d\n", nh->nlmsg_seq, nh->nlmsg_flags, errmsg->error);
3892 exit(1);
3893 }
3894 else
3895 LOG(1, 0, 0, "Got a netlink error: seq %d flags %d code %d\n", nh->nlmsg_seq, nh->nlmsg_flags, errmsg->error);
3896 }
3897 else
3898 LOG(1, 0, 0, "Got a unknown netlink message: type %d seq %d flags %d\n", nh->nlmsg_type, nh->nlmsg_seq, nh->nlmsg_flags);
3899 n--;
3900 break;
3901 }
3902
3903 default:
3904 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
3905 }
3906 }
3907
3908 #ifdef BGP
3909 bgp_process(bgp_events);
3910 #endif /* BGP */
3911
3912 for (c = 0; n && c < config->multi_read_count; c++)
3913 {
3914 // L2TP
3915 if (udp_ready)
3916 {
3917 alen = sizeof(addr);
3918 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
3919 {
3920 processudp(buf, s, &addr);
3921 udp_pkts++;
3922 }
3923 else
3924 {
3925 udp_ready = 0;
3926 n--;
3927 }
3928 }
3929
3930 // incoming IP
3931 if (tun_ready)
3932 {
3933 if ((s = read(tunfd, buf, sizeof(buf))) > 0)
3934 {
3935 processtun(buf, s);
3936 tun_pkts++;
3937 }
3938 else
3939 {
3940 tun_ready = 0;
3941 n--;
3942 }
3943 }
3944
3945 // cluster
3946 if (cluster_ready)
3947 {
3948 alen = sizeof(addr);
3949 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
3950 {
3951 processcluster(buf, s, addr.sin_addr.s_addr);
3952 cluster_pkts++;
3953 }
3954 else
3955 {
3956 cluster_ready = 0;
3957 n--;
3958 }
3959 }
3960 }
3961
3962 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
3963 STAT(multi_read_used);
3964
3965 if (c >= config->multi_read_count)
3966 {
3967 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3968 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
3969
3970 STAT(multi_read_exceeded);
3971 more++;
3972 }
3973 }
3974
3975 if (time_changed)
3976 {
3977 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
3978
3979 // Log current traffic stats
3980 snprintf(config->bandwidth, sizeof(config->bandwidth),
3981 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3982 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
3983 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
3984 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
3985
3986 udp_tx = udp_rx = 0;
3987 udp_rx_pkt = eth_rx_pkt = 0;
3988 eth_tx = eth_rx = 0;
3989 time_changed = 0;
3990
3991 if (config->dump_speed)
3992 printf("%s\n", config->bandwidth);
3993
3994 // Update the internal time counter
3995 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
3996
3997 {
3998 // Run timer hooks
3999 struct param_timer p = { time_now };
4000 run_plugins(PLUGIN_TIMER, &p);
4001 }
4002 }
4003
4004 // Runs on every machine (master and slaves).
4005 if (next_cluster_ping <= TIME)
4006 {
4007 // Check to see which of the cluster is still alive..
4008
4009 cluster_send_ping(basetime); // Only does anything if we're a slave
4010 cluster_check_master(); // ditto.
4011
4012 cluster_heartbeat(); // Only does anything if we're a master.
4013 cluster_check_slaves(); // ditto.
4014
4015 master_update_counts(); // If we're a slave, send our byte counters to our master.
4016
4017 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4018 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4019 else
4020 next_cluster_ping = TIME + config->cluster_hb_interval;
4021 }
4022
4023 if (!config->cluster_iam_master)
4024 continue;
4025
4026 // Run token bucket filtering queue..
4027 // Only run it every 1/10th of a second.
4028 {
4029 static clockt last_run = 0;
4030 if (last_run != TIME)
4031 {
4032 last_run = TIME;
4033 tbf_run_timer();
4034 }
4035 }
4036
4037 // Handle timeouts, retries etc.
4038 {
4039 static double last_clean = 0;
4040 double this_clean;
4041 double diff;
4042
4043 TIME = now(&this_clean);
4044 diff = this_clean - last_clean;
4045
4046 // Run during idle time (after we've handled
4047 // all incoming packets) or every 1/10th sec
4048 if (!more || diff > 0.1)
4049 {
4050 regular_cleanups(diff);
4051 last_clean = this_clean;
4052 }
4053 }
4054
4055 if (*config->accounting_dir)
4056 {
4057 static clockt next_acct = 0;
4058 static clockt next_shut_acct = 0;
4059
4060 if (next_acct <= TIME)
4061 {
4062 // Dump accounting data
4063 next_acct = TIME + ACCT_TIME;
4064 next_shut_acct = TIME + ACCT_SHUT_TIME;
4065 dump_acct_info(1);
4066 }
4067 else if (next_shut_acct <= TIME)
4068 {
4069 // Dump accounting data for shutdown sessions
4070 next_shut_acct = TIME + ACCT_SHUT_TIME;
4071 if (shut_acct_n)
4072 dump_acct_info(0);
4073 }
4074 }
4075 }
4076
4077 // Are we the master and shutting down??
4078 if (config->cluster_iam_master)
4079 cluster_heartbeat(); // Flush any queued changes..
4080
4081 // Ok. Notify everyone we're shutting down. If we're
4082 // the master, this will force an election.
4083 cluster_send_ping(0);
4084
4085 //
4086 // Important!!! We MUST not process any packets past this point!
4087 LOG(1, 0, 0, "Shutdown complete\n");
4088 }
4089
4090 static void stripdomain(char *host)
4091 {
4092 char *p;
4093
4094 if ((p = strchr(host, '.')))
4095 {
4096 char *domain = 0;
4097 char _domain[1024];
4098
4099 // strip off domain
4100 FILE *resolv = fopen("/etc/resolv.conf", "r");
4101 if (resolv)
4102 {
4103 char buf[1024];
4104 char *b;
4105
4106 while (fgets(buf, sizeof(buf), resolv))
4107 {
4108 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4109 continue;
4110
4111 if (!isspace(buf[6]))
4112 continue;
4113
4114 b = buf + 7;
4115 while (isspace(*b)) b++;
4116
4117 if (*b)
4118 {
4119 char *d = b;
4120 while (*b && !isspace(*b)) b++;
4121 *b = 0;
4122 if (buf[0] == 'd') // domain is canonical
4123 {
4124 domain = d;
4125 break;
4126 }
4127
4128 // first search line
4129 if (!domain)
4130 {
4131 // hold, may be subsequent domain line
4132 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4133 domain = _domain;
4134 }
4135 }
4136 }
4137
4138 fclose(resolv);
4139 }
4140
4141 if (domain)
4142 {
4143 int hl = strlen(host);
4144 int dl = strlen(domain);
4145 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4146 host[hl -dl - 1] = 0;
4147 }
4148 else
4149 {
4150 *p = 0; // everything after first dot
4151 }
4152 }
4153 }
4154
4155 // Init data structures
4156 static void initdata(int optdebug, char *optconfig)
4157 {
4158 int i;
4159
4160 if (!(config = shared_malloc(sizeof(configt))))
4161 {
4162 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4163 exit(1);
4164 }
4165
4166 memset(config, 0, sizeof(configt));
4167 time(&config->start_time);
4168 strncpy(config->config_file, optconfig, strlen(optconfig));
4169 config->debug = optdebug;
4170 config->num_tbfs = MAXTBFS;
4171 config->rl_rate = 28; // 28kbps
4172 config->cluster_mcast_ttl = 1;
4173 config->cluster_master_min_adv = 1;
4174 config->ppp_restart_time = 3;
4175 config->ppp_max_configure = 10;
4176 config->ppp_max_failure = 5;
4177 config->kill_timedout_sessions = 1;
4178 strcpy(config->random_device, RANDOMDEVICE);
4179
4180 log_stream = stderr;
4181
4182 #ifdef RINGBUFFER
4183 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4184 {
4185 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4186 exit(1);
4187 }
4188 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4189 #endif
4190
4191 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4192 {
4193 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4194 exit(1);
4195 }
4196 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4197 {
4198 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4199 exit(1);
4200 }
4201 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4202 {
4203 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4204 exit(1);
4205 }
4206 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4207 {
4208 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4209 exit(1);
4210 }
4211 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4212 {
4213 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4214 exit(1);
4215 }
4216
4217 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4218 {
4219 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4220 exit(1);
4221 }
4222
4223 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4224 {
4225 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4226 exit(1);
4227 }
4228
4229 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4230 {
4231 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4232 exit(1);
4233 }
4234
4235 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4236 {
4237 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4238 exit(1);
4239 }
4240 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4241
4242 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4243 {
4244 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4245 exit(1);
4246 }
4247 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4248
4249 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4250 {
4251 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4252 exit(1);
4253 }
4254 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4255
4256 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4257 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4258 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4259 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4260 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4261
4262 // Put all the sessions on the free list marked as undefined.
4263 for (i = 1; i < MAXSESSION; i++)
4264 {
4265 session[i].next = i + 1;
4266 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4267 }
4268 session[MAXSESSION - 1].next = 0;
4269 sessionfree = 1;
4270
4271 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4272 for (i = 1; i < MAXTUNNEL; i++)
4273 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4274
4275 for (i = 1; i < MAXBUNDLE; i++) {
4276 bundle[i].state = BUNDLEUNDEF;
4277 }
4278
4279 if (!*hostname)
4280 {
4281 // Grab my hostname unless it's been specified
4282 gethostname(hostname, sizeof(hostname));
4283 stripdomain(hostname);
4284 }
4285
4286 _statistics->start_time = _statistics->last_reset = time(NULL);
4287
4288 #ifdef BGP
4289 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4290 {
4291 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4292 exit(1);
4293 }
4294 #endif /* BGP */
4295 }
4296
4297 static int assign_ip_address(sessionidt s)
4298 {
4299 uint32_t i;
4300 int best = -1;
4301 time_t best_time = time_now;
4302 char *u = session[s].user;
4303 char reuse = 0;
4304
4305
4306 CSTAT(assign_ip_address);
4307
4308 for (i = 1; i < ip_pool_size; i++)
4309 {
4310 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4311 continue;
4312
4313 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4314 {
4315 best = i;
4316 reuse = 1;
4317 break;
4318 }
4319
4320 if (ip_address_pool[i].last < best_time)
4321 {
4322 best = i;
4323 if (!(best_time = ip_address_pool[i].last))
4324 break; // never used, grab this one
4325 }
4326 }
4327
4328 if (best < 0)
4329 {
4330 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4331 return 0;
4332 }
4333
4334 session[s].ip = ip_address_pool[best].address;
4335 session[s].ip_pool_index = best;
4336 ip_address_pool[best].assigned = 1;
4337 ip_address_pool[best].last = time_now;
4338 ip_address_pool[best].session = s;
4339 if (session[s].walled_garden)
4340 /* Don't track addresses of users in walled garden (note: this
4341 means that their address isn't "sticky" even if they get
4342 un-gardened). */
4343 ip_address_pool[best].user[0] = 0;
4344 else
4345 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4346
4347 STAT(ip_allocated);
4348 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4349 reuse ? "Reusing" : "Allocating", best);
4350
4351 return 1;
4352 }
4353
4354 static void free_ip_address(sessionidt s)
4355 {
4356 int i = session[s].ip_pool_index;
4357
4358
4359 CSTAT(free_ip_address);
4360
4361 if (!session[s].ip)
4362 return; // what the?
4363
4364 if (i < 0) // Is this actually part of the ip pool?
4365 i = 0;
4366
4367 STAT(ip_freed);
4368 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4369 session[s].ip = 0;
4370 ip_address_pool[i].assigned = 0;
4371 ip_address_pool[i].session = 0;
4372 ip_address_pool[i].last = time_now;
4373 }
4374
4375 //
4376 // Fsck the address pool against the session table.
4377 // Normally only called when we become a master.
4378 //
4379 // This isn't perfect: We aren't keep tracking of which
4380 // users used to have an IP address.
4381 //
4382 void rebuild_address_pool(void)
4383 {
4384 int i;
4385
4386 //
4387 // Zero the IP pool allocation, and build
4388 // a map from IP address to pool index.
4389 for (i = 1; i < MAXIPPOOL; ++i)
4390 {
4391 ip_address_pool[i].assigned = 0;
4392 ip_address_pool[i].session = 0;
4393 if (!ip_address_pool[i].address)
4394 continue;
4395
4396 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4397 }
4398
4399 for (i = 0; i < MAXSESSION; ++i)
4400 {
4401 int ipid;
4402 if (!(session[i].opened && session[i].ip))
4403 continue;
4404
4405 ipid = - lookup_ipmap(htonl(session[i].ip));
4406
4407 if (session[i].ip_pool_index < 0)
4408 {
4409 // Not allocated out of the pool.
4410 if (ipid < 1) // Not found in the pool either? good.
4411 continue;
4412
4413 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4414 i, fmtaddr(session[i].ip, 0), ipid);
4415
4416 // Fall through and process it as part of the pool.
4417 }
4418
4419
4420 if (ipid > MAXIPPOOL || ipid < 0)
4421 {
4422 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4423 ipid = -1;
4424 session[i].ip_pool_index = ipid;
4425 continue;
4426 }
4427
4428 ip_address_pool[ipid].assigned = 1;
4429 ip_address_pool[ipid].session = i;
4430 ip_address_pool[ipid].last = time_now;
4431 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4432 session[i].ip_pool_index = ipid;
4433 cache_ipmap(session[i].ip, i); // Fix the ip map.
4434 }
4435 }
4436
4437 //
4438 // Fix the address pool to match a changed session.
4439 // (usually when the master sends us an update).
4440 static void fix_address_pool(int sid)
4441 {
4442 int ipid;
4443
4444 ipid = session[sid].ip_pool_index;
4445
4446 if (ipid > ip_pool_size)
4447 return; // Ignore it. rebuild_address_pool will fix it up.
4448
4449 if (ip_address_pool[ipid].address != session[sid].ip)
4450 return; // Just ignore it. rebuild_address_pool will take care of it.
4451
4452 ip_address_pool[ipid].assigned = 1;
4453 ip_address_pool[ipid].session = sid;
4454 ip_address_pool[ipid].last = time_now;
4455 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4456 }
4457
4458 //
4459 // Add a block of addresses to the IP pool to hand out.
4460 //
4461 static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
4462 {
4463 int i;
4464 if (mask == 0)
4465 mask = 0xffffffff; // Host route only.
4466
4467 addr &= mask;
4468
4469 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4470 return ;
4471
4472 for (i = addr ;(i & mask) == addr; ++i)
4473 {
4474 if ((i & 0xff) == 0 || (i&0xff) == 255)
4475 continue; // Skip 0 and broadcast addresses.
4476
4477 ip_address_pool[ip_pool_size].address = i;
4478 ip_address_pool[ip_pool_size].assigned = 0;
4479 ++ip_pool_size;
4480 if (ip_pool_size >= MAXIPPOOL)
4481 {
4482 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4483 return;
4484 }
4485 }
4486 }
4487
4488 // Initialize the IP address pool
4489 static void initippool()
4490 {
4491 FILE *f;
4492 char *p;
4493 char buf[4096];
4494 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4495
4496 if (!(f = fopen(IPPOOLFILE, "r")))
4497 {
4498 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4499 exit(1);
4500 }
4501
4502 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4503 {
4504 char *pool = buf;
4505 buf[4095] = 0; // Force it to be zero terminated/
4506
4507 if (*buf == '#' || *buf == '\n')
4508 continue; // Skip comments / blank lines
4509 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4510 if ((p = (char *)strchr(buf, ':')))
4511 {
4512 in_addr_t src;
4513 *p = '\0';
4514 src = inet_addr(buf);
4515 if (src == INADDR_NONE)
4516 {
4517 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4518 exit(1);
4519 }
4520 // This entry is for a specific IP only
4521 if (src != config->bind_address)
4522 continue;
4523 *p = ':';
4524 pool = p+1;
4525 }
4526 if ((p = (char *)strchr(pool, '/')))
4527 {
4528 // It's a range
4529 int numbits = 0;
4530 in_addr_t start = 0, mask = 0;
4531
4532 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4533 *p++ = 0;
4534 if (!*p || !(numbits = atoi(p)))
4535 {
4536 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4537 continue;
4538 }
4539 start = ntohl(inet_addr(pool));
4540 mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
4541
4542 // Add a static route for this pool
4543 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
4544 fmtaddr(htonl(start), 0), 32 + mask);
4545
4546 routeset(0, start, mask, 0, 1);
4547
4548 add_to_ip_pool(start, mask);
4549 }
4550 else
4551 {
4552 // It's a single ip address
4553 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4554 }
4555 }
4556 fclose(f);
4557 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4558 }
4559
4560 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4561 {
4562 struct sockaddr_in snoop_addr = {0};
4563 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4564 return;
4565
4566 snoop_addr.sin_family = AF_INET;
4567 snoop_addr.sin_addr.s_addr = destination;
4568 snoop_addr.sin_port = ntohs(port);
4569
4570 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4571 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4572 htons(snoop_addr.sin_port));
4573
4574 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4575 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4576
4577 STAT(packets_snooped);
4578 }
4579
4580 static int dump_session(FILE **f, sessiont *s)
4581 {
4582 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4583 return 1;
4584
4585 if (!*f)
4586 {
4587 char filename[1024];
4588 char timestr[64];
4589 time_t now = time(NULL);
4590
4591 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4592 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4593
4594 if (!(*f = fopen(filename, "w")))
4595 {
4596 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4597 return 0;
4598 }
4599
4600 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4601 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4602 "# host: %s\n"
4603 "# endpoint: %s\n"
4604 "# time: %ld\n"
4605 "# uptime: %ld\n"
4606 "# format: username ip qos uptxoctets downrxoctets\n",
4607 hostname,
4608 fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
4609 now,
4610 now - basetime);
4611 }
4612
4613 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4614 fprintf(*f, "%s %s %d %u %u\n",
4615 s->user, // username
4616 fmtaddr(htonl(s->ip), 0), // ip
4617 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4618 (uint32_t) s->cin_delta, // uptxoctets
4619 (uint32_t) s->cout_delta); // downrxoctets
4620
4621 s->cin_delta = s->cout_delta = 0;
4622
4623 return 1;
4624 }
4625
4626 static void dump_acct_info(int all)
4627 {
4628 int i;
4629 FILE *f = NULL;
4630
4631
4632 CSTAT(dump_acct_info);
4633
4634 if (shut_acct_n)
4635 {
4636 for (i = 0; i < shut_acct_n; i++)
4637 dump_session(&f, &shut_acct[i]);
4638
4639 shut_acct_n = 0;
4640 }
4641
4642 if (all)
4643 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4644 dump_session(&f, &session[i]);
4645
4646 if (f)
4647 fclose(f);
4648 }
4649
4650 // Main program
4651 int main(int argc, char *argv[])
4652 {
4653 int i;
4654 int optdebug = 0;
4655 char *optconfig = CONFIGFILE;
4656
4657 time(&basetime); // start clock
4658
4659 // scan args
4660 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4661 {
4662 switch (i)
4663 {
4664 case 'd':
4665 if (fork()) exit(0);
4666 setsid();
4667 freopen("/dev/null", "r", stdin);
4668 freopen("/dev/null", "w", stdout);
4669 freopen("/dev/null", "w", stderr);
4670 break;
4671 case 'v':
4672 optdebug++;
4673 break;
4674 case 'c':
4675 optconfig = optarg;
4676 break;
4677 case 'h':
4678 snprintf(hostname, sizeof(hostname), "%s", optarg);
4679 break;
4680 default:
4681 printf("Args are:\n"
4682 "\t-d\t\tDetach from terminal\n"
4683 "\t-c <file>\tConfig file\n"
4684 "\t-h <hostname>\tForce hostname\n"
4685 "\t-v\t\tDebug\n");
4686
4687 return (0);
4688 break;
4689 }
4690 }
4691
4692 // Start the timer routine off
4693 time(&time_now);
4694 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4695
4696 initplugins();
4697 initdata(optdebug, optconfig);
4698
4699 init_cli(hostname);
4700 read_config_file();
4701 update_config();
4702 init_tbf(config->num_tbfs);
4703
4704 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4705 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4706 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4707 {
4708 struct rlimit rlim;
4709 rlim.rlim_cur = RLIM_INFINITY;
4710 rlim.rlim_max = RLIM_INFINITY;
4711 // Remove the maximum core size
4712 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
4713 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
4714
4715 // Make core dumps go to /tmp
4716 chdir("/tmp");
4717 }
4718
4719 if (config->scheduler_fifo)
4720 {
4721 int ret;
4722 struct sched_param params = {0};
4723 params.sched_priority = 1;
4724
4725 if (get_nprocs() < 2)
4726 {
4727 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4728 config->scheduler_fifo = 0;
4729 }
4730 else
4731 {
4732 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
4733 {
4734 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4735 }
4736 else
4737 {
4738 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
4739 config->scheduler_fifo = 0;
4740 }
4741 }
4742 }
4743
4744 initnetlink();
4745
4746 /* Set up the cluster communications port. */
4747 if (cluster_init() < 0)
4748 exit(1);
4749
4750 inittun();
4751 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
4752
4753 initudp();
4754 initrad();
4755 initippool();
4756
4757 // seed prng
4758 {
4759 unsigned seed = time_now ^ getpid();
4760 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
4761 srand(seed);
4762 }
4763
4764 signal(SIGHUP, sighup_handler);
4765 signal(SIGCHLD, sigchild_handler);
4766 signal(SIGTERM, shutdown_handler);
4767 signal(SIGINT, shutdown_handler);
4768 signal(SIGQUIT, shutdown_handler);
4769
4770 // Prevent us from getting paged out
4771 if (config->lock_pages)
4772 {
4773 if (!mlockall(MCL_CURRENT))
4774 LOG(1, 0, 0, "Locking pages into memory\n");
4775 else
4776 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
4777 }
4778
4779 mainloop();
4780
4781 /* remove plugins (so cleanup code gets run) */
4782 plugins_done();
4783
4784 // Remove the PID file if we wrote it
4785 if (config->wrote_pid && *config->pid_file == '/')
4786 unlink(config->pid_file);
4787
4788 /* kill CLI children */
4789 signal(SIGTERM, SIG_IGN);
4790 kill(0, SIGTERM);
4791 return 0;
4792 }
4793
4794 static void sighup_handler(int sig)
4795 {
4796 main_reload++;
4797 }
4798
4799 static void shutdown_handler(int sig)
4800 {
4801 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
4802 }
4803
4804 static void sigchild_handler(int sig)
4805 {
4806 while (waitpid(-1, NULL, WNOHANG) > 0)
4807 ;
4808 }
4809
4810 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
4811 {
4812 MD5_CTX ctx;
4813 *challenge_response = NULL;
4814
4815 if (!*config->l2tp_secret)
4816 {
4817 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4818 return;
4819 }
4820
4821 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4822
4823 *challenge_response = calloc(17, 1);
4824
4825 MD5_Init(&ctx);
4826 MD5_Update(&ctx, &id, 1);
4827 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
4828 MD5_Update(&ctx, challenge, challenge_length);
4829 MD5_Final(*challenge_response, &ctx);
4830
4831 return;
4832 }
4833
4834 static int facility_value(char *name)
4835 {
4836 int i;
4837 for (i = 0; facilitynames[i].c_name; i++)
4838 {
4839 if (strcmp(facilitynames[i].c_name, name) == 0)
4840 return facilitynames[i].c_val;
4841 }
4842 return 0;
4843 }
4844
4845 static void update_config()
4846 {
4847 int i;
4848 char *p;
4849 static int timeout = 0;
4850 static int interval = 0;
4851
4852 // Update logging
4853 closelog();
4854 syslog_log = 0;
4855 if (log_stream)
4856 {
4857 if (log_stream != stderr)
4858 fclose(log_stream);
4859
4860 log_stream = NULL;
4861 }
4862
4863 if (*config->log_filename)
4864 {
4865 if (strstr(config->log_filename, "syslog:") == config->log_filename)
4866 {
4867 char *p = config->log_filename + 7;
4868 if (*p)
4869 {
4870 openlog("l2tpns", LOG_PID, facility_value(p));
4871 syslog_log = 1;
4872 }
4873 }
4874 else if (strchr(config->log_filename, '/') == config->log_filename)
4875 {
4876 if ((log_stream = fopen((char *)(config->log_filename), "a")))
4877 {
4878 fseek(log_stream, 0, SEEK_END);
4879 setbuf(log_stream, NULL);
4880 }
4881 else
4882 {
4883 log_stream = stderr;
4884 setbuf(log_stream, NULL);
4885 }
4886 }
4887 }
4888 else
4889 {
4890 log_stream = stderr;
4891 setbuf(log_stream, NULL);
4892 }
4893
4894 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4895 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4896
4897 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
4898 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
4899 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
4900
4901 // reset MRU/MSS globals
4902 MRU = config->l2tp_mtu - L2TP_HDRS;
4903 if (MRU > PPPoE_MRU)
4904 MRU = PPPoE_MRU;
4905
4906 MSS = MRU - TCP_HDRS;
4907
4908 // Update radius
4909 config->numradiusservers = 0;
4910 for (i = 0; i < MAXRADSERVER; i++)
4911 if (config->radiusserver[i])
4912 {
4913 config->numradiusservers++;
4914 // Set radius port: if not set, take the port from the
4915 // first radius server. For the first radius server,
4916 // take the #defined default value from l2tpns.h
4917
4918 // test twice, In case someone works with
4919 // a secondary radius server without defining
4920 // a primary one, this will work even then.
4921 if (i > 0 && !config->radiusport[i])
4922 config->radiusport[i] = config->radiusport[i-1];
4923 if (!config->radiusport[i])
4924 config->radiusport[i] = RADPORT;
4925 }
4926
4927 if (!config->numradiusservers)
4928 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4929
4930 // parse radius_authtypes_s
4931 config->radius_authtypes = config->radius_authprefer = 0;
4932 p = config->radius_authtypes_s;
4933 while (p && *p)
4934 {
4935 char *s = strpbrk(p, " \t,");
4936 int type = 0;
4937
4938 if (s)
4939 {
4940 *s++ = 0;
4941 while (*s == ' ' || *s == '\t')
4942 s++;
4943
4944 if (!*s)
4945 s = 0;
4946 }
4947
4948 if (!strncasecmp("chap", p, strlen(p)))
4949 type = AUTHCHAP;
4950 else if (!strncasecmp("pap", p, strlen(p)))
4951 type = AUTHPAP;
4952 else
4953 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
4954
4955 config->radius_authtypes |= type;
4956 if (!config->radius_authprefer)
4957 config->radius_authprefer = type;
4958
4959 p = s;
4960 }
4961
4962 if (!config->radius_authtypes)
4963 {
4964 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4965 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
4966 }
4967
4968 // normalise radius_authtypes_s
4969 if (config->radius_authprefer == AUTHPAP)
4970 {
4971 strcpy(config->radius_authtypes_s, "pap");
4972 if (config->radius_authtypes & AUTHCHAP)
4973 strcat(config->radius_authtypes_s, ", chap");
4974 }
4975 else
4976 {
4977 strcpy(config->radius_authtypes_s, "chap");
4978 if (config->radius_authtypes & AUTHPAP)
4979 strcat(config->radius_authtypes_s, ", pap");
4980 }
4981
4982 if (!config->radius_dae_port)
4983 config->radius_dae_port = DAEPORT;
4984
4985 // re-initialise the random number source
4986 initrandom(config->random_device);
4987
4988 // Update plugins
4989 for (i = 0; i < MAXPLUGINS; i++)
4990 {
4991 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
4992 continue;
4993
4994 if (*config->plugins[i])
4995 {
4996 // Plugin added
4997 add_plugin(config->plugins[i]);
4998 }
4999 else if (*config->old_plugins[i])
5000 {
5001 // Plugin removed
5002 remove_plugin(config->old_plugins[i]);
5003 }
5004 }
5005
5006 // Guest change
5007 guest_accounts_num = 0;
5008 char *p2 = config->guest_user;
5009 while (p2 && *p2)
5010 {
5011 char *s = strpbrk(p2, " \t,");
5012 if (s)
5013 {
5014 *s++ = 0;
5015 while (*s == ' ' || *s == '\t')
5016 s++;
5017
5018 if (!*s)
5019 s = 0;
5020 }
5021
5022 strcpy(guest_users[guest_accounts_num], p2);
5023 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5024 guest_accounts_num++;
5025 p2 = s;
5026 }
5027 // Rebuild the guest_user array
5028 strcpy(config->guest_user, "");
5029 int ui = 0;
5030 for (ui=0; ui<guest_accounts_num; ui++)
5031 {
5032 strcat(config->guest_user, guest_users[ui]);
5033 if (ui<guest_accounts_num-1)
5034 {
5035 strcat(config->guest_user, ",");
5036 }
5037 }
5038
5039
5040 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5041 if (!config->multi_read_count) config->multi_read_count = 10;
5042 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5043 if (!*config->cluster_interface)
5044 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5045
5046 if (!config->cluster_hb_interval)
5047 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5048
5049 if (!config->cluster_hb_timeout)
5050 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5051
5052 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5053 {
5054 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5055 // late, ensure we're sufficiently larger than that
5056 int t = 4 * config->cluster_hb_interval + 11;
5057
5058 if (config->cluster_hb_timeout < t)
5059 {
5060 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5061 config->cluster_hb_timeout = t;
5062 }
5063
5064 // Push timing changes to the slaves immediately if we're the master
5065 if (config->cluster_iam_master)
5066 cluster_heartbeat();
5067
5068 interval = config->cluster_hb_interval;
5069 timeout = config->cluster_hb_timeout;
5070 }
5071
5072 // Write PID file
5073 if (*config->pid_file == '/' && !config->wrote_pid)
5074 {
5075 FILE *f;
5076 if ((f = fopen(config->pid_file, "w")))
5077 {
5078 fprintf(f, "%d\n", getpid());
5079 fclose(f);
5080 config->wrote_pid = 1;
5081 }
5082 else
5083 {
5084 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5085 }
5086 }
5087 }
5088
5089 static void read_config_file()
5090 {
5091 FILE *f;
5092
5093 if (!config->config_file) return;
5094 if (!(f = fopen(config->config_file, "r")))
5095 {
5096 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5097 return;
5098 }
5099
5100 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5101 cli_do_file(f);
5102 LOG(3, 0, 0, "Done reading config file\n");
5103 fclose(f);
5104 }
5105
5106 int sessionsetup(sessionidt s, tunnelidt t)
5107 {
5108 // A session now exists, set it up
5109 in_addr_t ip;
5110 char *user;
5111 sessionidt i;
5112 int r;
5113
5114 CSTAT(sessionsetup);
5115
5116 LOG(3, s, t, "Doing session setup for session\n");
5117
5118 // Join a bundle if the MRRU option is accepted
5119 if(session[s].mrru > 0 && session[s].bundle == 0)
5120 {
5121 LOG(3, s, t, "This session can be part of multilink bundle\n");
5122 if (join_bundle(s) > 0)
5123 cluster_send_bundle(session[s].bundle);
5124 else
5125 {
5126 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5127 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5128 return 0;
5129 }
5130 }
5131
5132 if (!session[s].ip)
5133 {
5134 assign_ip_address(s);
5135 if (!session[s].ip)
5136 {
5137 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5138 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5139 return 0;
5140 }
5141 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5142 fmtaddr(htonl(session[s].ip), 0));
5143 }
5144
5145
5146 // Make sure this is right
5147 session[s].tunnel = t;
5148
5149 // zap old sessions with same IP and/or username
5150 // Don't kill gardened sessions - doing so leads to a DoS
5151 // from someone who doesn't need to know the password
5152 {
5153 ip = session[s].ip;
5154 user = session[s].user;
5155 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5156 {
5157 if (i == s) continue;
5158 if (!session[s].opened) continue;
5159 // Allow duplicate sessions for multilink ones of the same bundle.
5160 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
5161 continue;
5162 if (ip == session[i].ip)
5163 {
5164 sessionkill(i, "Duplicate IP address");
5165 continue;
5166 }
5167
5168 if (config->allow_duplicate_users) continue;
5169 if (session[s].walled_garden || session[i].walled_garden) continue;
5170 // Guest change
5171 int found = 0;
5172 int gu;
5173 for (gu = 0; gu < guest_accounts_num; gu++)
5174 {
5175 if (!strcasecmp(user, guest_users[gu]))
5176 {
5177 found = 1;
5178 break;
5179 }
5180 }
5181 if (found) continue;
5182
5183 // Drop the new session in case of duplicate sessionss, not the old one.
5184 if (!strcasecmp(user, session[i].user))
5185 sessionkill(i, "Duplicate session for users");
5186 }
5187 }
5188
5189 // no need to set a route for the same IP address of the bundle
5190 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5191 {
5192 int routed = 0;
5193
5194 // Add the route for this session.
5195 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5196 {
5197 if ((session[s].ip & session[s].route[r].mask) ==
5198 (session[s].route[r].ip & session[s].route[r].mask))
5199 routed++;
5200
5201 routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
5202 }
5203
5204 // Static IPs need to be routed if not already
5205 // convered by a Framed-Route. Anything else is part
5206 // of the IP address pool and is already routed, it
5207 // just needs to be added to the IP cache.
5208 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5209 if (session[s].ip_pool_index == -1) // static ip
5210 {
5211 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5212 }
5213 else
5214 cache_ipmap(session[s].ip, s);
5215 }
5216
5217 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5218 lcp_open(s, t); // transition to Network phase and send initial IPCP
5219
5220 // Run the plugin's against this new session.
5221 {
5222 struct param_new_session data = { &tunnel[t], &session[s] };
5223 run_plugins(PLUGIN_NEW_SESSION, &data);
5224 }
5225
5226 // Allocate TBFs if throttled
5227 if (session[s].throttle_in || session[s].throttle_out)
5228 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5229
5230 session[s].last_packet = session[s].last_data = time_now;
5231
5232 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5233 fmtaddr(htonl(session[s].ip), 0),
5234 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5235
5236 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5237
5238 return 1; // RADIUS OK and IP allocated, done...
5239 }
5240
5241 //
5242 // This session just got dropped on us by the master or something.
5243 // Make sure our tables up up to date...
5244 //
5245 int load_session(sessionidt s, sessiont *new)
5246 {
5247 int i;
5248 int newip = 0;
5249
5250 // Sanity checks.
5251 if (new->ip_pool_index >= MAXIPPOOL ||
5252 new->tunnel >= MAXTUNNEL)
5253 {
5254 LOG(0, s, 0, "Strange session update received!\n");
5255 // FIXME! What to do here?
5256 return 0;
5257 }
5258
5259 //
5260 // Ok. All sanity checks passed. Now we're committed to
5261 // loading the new session.
5262 //
5263
5264 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5265
5266 // See if routes/ip cache need updating
5267 if (new->ip != session[s].ip)
5268 newip++;
5269
5270 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5271 if (new->route[i].ip != session[s].route[i].ip ||
5272 new->route[i].mask != session[s].route[i].mask)
5273 newip++;
5274
5275 // needs update
5276 if (newip)
5277 {
5278 int routed = 0;
5279
5280 // remove old routes...
5281 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5282 {
5283 if ((session[s].ip & session[s].route[i].mask) ==
5284 (session[s].route[i].ip & session[s].route[i].mask))
5285 routed++;
5286
5287 routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
5288 }
5289
5290 // ...ip
5291 if (session[s].ip)
5292 {
5293 if (session[s].ip_pool_index == -1) // static IP
5294 {
5295 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5296 }
5297 else // It's part of the IP pool, remove it manually.
5298 uncache_ipmap(session[s].ip);
5299 }
5300
5301 routed = 0;
5302
5303 // add new routes...
5304 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5305 {
5306 if ((new->ip & new->route[i].mask) ==
5307 (new->route[i].ip & new->route[i].mask))
5308 routed++;
5309
5310 routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
5311 }
5312
5313 // ...ip
5314 if (new->ip)
5315 {
5316 // If there's a new one, add it.
5317 if (new->ip_pool_index == -1)
5318 {
5319 if (!routed) routeset(s, new->ip, 0, 0, 1);
5320 }
5321 else
5322 cache_ipmap(new->ip, s);
5323 }
5324 }
5325
5326 // check v6 routing
5327 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5328 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5329
5330 // check filters
5331 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5332 {
5333 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5334 new->filter_in = 0;
5335 }
5336
5337 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5338 {
5339 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5340 new->filter_out = 0;
5341 }
5342
5343 if (new->filter_in != session[s].filter_in)
5344 {
5345 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5346 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5347 }
5348
5349 if (new->filter_out != session[s].filter_out)
5350 {
5351 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5352 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5353 }
5354
5355 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5356 // for walking the sessions to forward byte counts to the master.
5357 config->cluster_highest_sessionid = s;
5358
5359 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5360
5361 // Do fixups into address pool.
5362 if (new->ip_pool_index != -1)
5363 fix_address_pool(s);
5364
5365 return 1;
5366 }
5367
5368 static void initplugins()
5369 {
5370 int i;
5371
5372 loaded_plugins = ll_init();
5373 // Initialize the plugins to nothing
5374 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5375 plugins[i] = ll_init();
5376 }
5377
5378 static void *open_plugin(char *plugin_name, int load)
5379 {
5380 char path[256] = "";
5381
5382 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5383 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5384 return dlopen(path, RTLD_NOW);
5385 }
5386
5387 // plugin callback to get a config value
5388 static void *getconfig(char *key, enum config_typet type)
5389 {
5390 int i;
5391
5392 for (i = 0; config_values[i].key; i++)
5393 {
5394 if (!strcmp(config_values[i].key, key))
5395 {
5396 if (config_values[i].type == type)
5397 return ((void *) config) + config_values[i].offset;
5398
5399 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5400 key, type, config_values[i].type);
5401
5402 return 0;
5403 }
5404 }
5405
5406 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5407 return 0;
5408 }
5409
5410 static int add_plugin(char *plugin_name)
5411 {
5412 static struct pluginfuncs funcs = {
5413 _log,
5414 _log_hex,
5415 fmtaddr,
5416 sessionbyuser,
5417 sessiontbysessionidt,
5418 sessionidtbysessiont,
5419 radiusnew,
5420 radiussend,
5421 getconfig,
5422 sessionshutdown,
5423 sessionkill,
5424 throttle_session,
5425 cluster_send_session,
5426 };
5427
5428 void *p = open_plugin(plugin_name, 1);
5429 int (*initfunc)(struct pluginfuncs *);
5430 int i;
5431
5432 if (!p)
5433 {
5434 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5435 return -1;
5436 }
5437
5438 if (ll_contains(loaded_plugins, p))
5439 {
5440 dlclose(p);
5441 return 0; // already loaded
5442 }
5443
5444 {
5445 int *v = dlsym(p, "plugin_api_version");
5446 if (!v || *v != PLUGIN_API_VERSION)
5447 {
5448 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5449 dlclose(p);
5450 return -1;
5451 }
5452 }
5453
5454 if ((initfunc = dlsym(p, "plugin_init")))
5455 {
5456 if (!initfunc(&funcs))
5457 {
5458 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5459 dlclose(p);
5460 return -1;
5461 }
5462 }
5463
5464 ll_push(loaded_plugins, p);
5465
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 {
5471 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5472 ll_push(plugins[i], x);
5473 }
5474 }
5475
5476 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5477 return 1;
5478 }
5479
5480 static void run_plugin_done(void *plugin)
5481 {
5482 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5483
5484 if (donefunc)
5485 donefunc();
5486 }
5487
5488 static int remove_plugin(char *plugin_name)
5489 {
5490 void *p = open_plugin(plugin_name, 0);
5491 int loaded = 0;
5492
5493 if (!p)
5494 return -1;
5495
5496 if (ll_contains(loaded_plugins, p))
5497 {
5498 int i;
5499 for (i = 0; i < max_plugin_functions; i++)
5500 {
5501 void *x;
5502 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5503 ll_delete(plugins[i], x);
5504 }
5505
5506 ll_delete(loaded_plugins, p);
5507 run_plugin_done(p);
5508 loaded = 1;
5509 }
5510
5511 dlclose(p);
5512 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5513 return loaded;
5514 }
5515
5516 int run_plugins(int plugin_type, void *data)
5517 {
5518 int (*func)(void *data);
5519
5520 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5521 return PLUGIN_RET_ERROR;
5522
5523 ll_reset(plugins[plugin_type]);
5524 while ((func = ll_next(plugins[plugin_type])))
5525 {
5526 int r = func(data);
5527
5528 if (r != PLUGIN_RET_OK)
5529 return r; // stop here
5530 }
5531
5532 return PLUGIN_RET_OK;
5533 }
5534
5535 static void plugins_done()
5536 {
5537 void *p;
5538
5539 ll_reset(loaded_plugins);
5540 while ((p = ll_next(loaded_plugins)))
5541 run_plugin_done(p);
5542 }
5543
5544 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5545 {
5546 struct nsctl request;
5547 struct nsctl response;
5548 int type = unpack_control(&request, buf, len);
5549 int r;
5550 void *p;
5551
5552 if (log_stream && config->debug >= 4)
5553 {
5554 if (type < 0)
5555 {
5556 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5557 fmtaddr(addr->sin_addr.s_addr, 0), type);
5558 }
5559 else
5560 {
5561 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5562 dump_control(&request, log_stream);
5563 }
5564 }
5565
5566 switch (type)
5567 {
5568 case NSCTL_REQ_LOAD:
5569 if (request.argc != 1)
5570 {
5571 response.type = NSCTL_RES_ERR;
5572 response.argc = 1;
5573 response.argv[0] = "name of plugin required";
5574 }
5575 else if ((r = add_plugin(request.argv[0])) < 1)
5576 {
5577 response.type = NSCTL_RES_ERR;
5578 response.argc = 1;
5579 response.argv[0] = !r
5580 ? "plugin already loaded"
5581 : "error loading plugin";
5582 }
5583 else
5584 {
5585 response.type = NSCTL_RES_OK;
5586 response.argc = 0;
5587 }
5588
5589 break;
5590
5591 case NSCTL_REQ_UNLOAD:
5592 if (request.argc != 1)
5593 {
5594 response.type = NSCTL_RES_ERR;
5595 response.argc = 1;
5596 response.argv[0] = "name of plugin required";
5597 }
5598 else if ((r = remove_plugin(request.argv[0])) < 1)
5599 {
5600 response.type = NSCTL_RES_ERR;
5601 response.argc = 1;
5602 response.argv[0] = !r
5603 ? "plugin not loaded"
5604 : "plugin not found";
5605 }
5606 else
5607 {
5608 response.type = NSCTL_RES_OK;
5609 response.argc = 0;
5610 }
5611
5612 break;
5613
5614 case NSCTL_REQ_HELP:
5615 response.type = NSCTL_RES_OK;
5616 response.argc = 0;
5617
5618 ll_reset(loaded_plugins);
5619 while ((p = ll_next(loaded_plugins)))
5620 {
5621 char **help = dlsym(p, "plugin_control_help");
5622 while (response.argc < 0xff && help && *help)
5623 response.argv[response.argc++] = *help++;
5624 }
5625
5626 break;
5627
5628 case NSCTL_REQ_CONTROL:
5629 {
5630 struct param_control param = {
5631 config->cluster_iam_master,
5632 request.argc,
5633 request.argv,
5634 0,
5635 NULL,
5636 };
5637
5638 int r = run_plugins(PLUGIN_CONTROL, &param);
5639
5640 if (r == PLUGIN_RET_ERROR)
5641 {
5642 response.type = NSCTL_RES_ERR;
5643 response.argc = 1;
5644 response.argv[0] = param.additional
5645 ? param.additional
5646 : "error returned by plugin";
5647 }
5648 else if (r == PLUGIN_RET_NOTMASTER)
5649 {
5650 static char msg[] = "must be run on master: 000.000.000.000";
5651
5652 response.type = NSCTL_RES_ERR;
5653 response.argc = 1;
5654 if (config->cluster_master_address)
5655 {
5656 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5657 response.argv[0] = msg;
5658 }
5659 else
5660 {
5661 response.argv[0] = "must be run on master: none elected";
5662 }
5663 }
5664 else if (!(param.response & NSCTL_RESPONSE))
5665 {
5666 response.type = NSCTL_RES_ERR;
5667 response.argc = 1;
5668 response.argv[0] = param.response
5669 ? "unrecognised response value from plugin"
5670 : "unhandled action";
5671 }
5672 else
5673 {
5674 response.type = param.response;
5675 response.argc = 0;
5676 if (param.additional)
5677 {
5678 response.argc = 1;
5679 response.argv[0] = param.additional;
5680 }
5681 }
5682 }
5683
5684 break;
5685
5686 default:
5687 response.type = NSCTL_RES_ERR;
5688 response.argc = 1;
5689 response.argv[0] = "error unpacking control packet";
5690 }
5691
5692 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5693 if (!buf)
5694 {
5695 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5696 return;
5697 }
5698
5699 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5700 if (r > 0)
5701 {
5702 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
5703 if (log_stream && config->debug >= 4)
5704 {
5705 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5706 dump_control(&response, log_stream);
5707 }
5708 }
5709 else
5710 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5711 fmtaddr(addr->sin_addr.s_addr, 0), r);
5712
5713 free(buf);
5714 }
5715
5716 static tunnelidt new_tunnel()
5717 {
5718 tunnelidt i;
5719 for (i = 1; i < MAXTUNNEL; i++)
5720 {
5721 if (tunnel[i].state == TUNNELFREE)
5722 {
5723 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
5724 if (i > config->cluster_highest_tunnelid)
5725 config->cluster_highest_tunnelid = i;
5726 return i;
5727 }
5728 }
5729 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5730 return 0;
5731 }
5732
5733 //
5734 // We're becoming the master. Do any required setup..
5735 //
5736 // This is principally telling all the plugins that we're
5737 // now a master, and telling them about all the sessions
5738 // that are active too..
5739 //
5740 void become_master(void)
5741 {
5742 int s, i;
5743 static struct event_data d[RADIUS_FDS];
5744 struct epoll_event e;
5745
5746 run_plugins(PLUGIN_BECOME_MASTER, NULL);
5747
5748 // running a bunch of iptables commands is slow and can cause
5749 // the master to drop tunnels on takeover--kludge around the
5750 // problem by forking for the moment (note: race)
5751 if (!fork_and_close())
5752 {
5753 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5754 {
5755 if (!session[s].opened) // Not an in-use session.
5756 continue;
5757
5758 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
5759 }
5760 exit(0);
5761 }
5762
5763 // add radius fds
5764 e.events = EPOLLIN;
5765 for (i = 0; i < RADIUS_FDS; i++)
5766 {
5767 d[i].type = FD_TYPE_RADIUS;
5768 d[i].index = i;
5769 e.data.ptr = &d[i];
5770
5771 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
5772 }
5773 }
5774
5775 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
5776 {
5777 int s, i;
5778 int count = 0;
5779 int buckets[64];
5780
5781 if (CLI_HELP_REQUESTED)
5782 return CLI_HELP_NO_ARGS;
5783
5784 time(&time_now);
5785 for (i = 0; i < 64;++i) buckets[i] = 0;
5786
5787 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5788 {
5789 int idle;
5790 if (!session[s].opened)
5791 continue;
5792
5793 idle = time_now - session[s].last_data;
5794 idle /= 5 ; // In multiples of 5 seconds.
5795 if (idle < 0)
5796 idle = 0;
5797 if (idle > 63)
5798 idle = 63;
5799
5800 ++count;
5801 ++buckets[idle];
5802 }
5803
5804 for (i = 0; i < 63; ++i)
5805 {
5806 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
5807 }
5808 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
5809 cli_print(cli, "%d total sessions open.", count);
5810 return CLI_OK;
5811 }
5812
5813 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
5814 {
5815 int s, i;
5816 int count = 0;
5817 int buckets[64];
5818
5819 if (CLI_HELP_REQUESTED)
5820 return CLI_HELP_NO_ARGS;
5821
5822 time(&time_now);
5823 for (i = 0; i < 64;++i) buckets[i] = 0;
5824
5825 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
5826 {
5827 int open = 0, d;
5828 if (!session[s].opened)
5829 continue;
5830
5831 d = time_now - session[s].opened;
5832 if (d < 0)
5833 d = 0;
5834 while (d > 1 && open < 32)
5835 {
5836 ++open;
5837 d >>= 1; // half.
5838 }
5839 ++count;
5840 ++buckets[open];
5841 }
5842
5843 s = 1;
5844 for (i = 0; i < 30; ++i)
5845 {
5846 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
5847 s <<= 1;
5848 }
5849 cli_print(cli, "%d total sessions open.", count);
5850 return CLI_OK;
5851 }
5852
5853 /* Unhide an avp.
5854 *
5855 * This unencodes the AVP using the L2TP secret and the previously
5856 * stored random vector. It overwrites the hidden data with the
5857 * unhidden AVP subformat.
5858 */
5859 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
5860 {
5861 MD5_CTX ctx;
5862 uint8_t digest[16];
5863 uint8_t *last;
5864 size_t d = 0;
5865 uint16_t m = htons(type);
5866
5867 // Compute initial pad
5868 MD5_Init(&ctx);
5869 MD5_Update(&ctx, (unsigned char *) &m, 2);
5870 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5871 MD5_Update(&ctx, vector, vec_len);
5872 MD5_Final(digest, &ctx);
5873
5874 // pointer to last decoded 16 octets
5875 last = value;
5876
5877 while (len > 0)
5878 {
5879 // calculate a new pad based on the last decoded block
5880 if (d >= sizeof(digest))
5881 {
5882 MD5_Init(&ctx);
5883 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5884 MD5_Update(&ctx, last, sizeof(digest));
5885 MD5_Final(digest, &ctx);
5886
5887 d = 0;
5888 last = value;
5889 }
5890
5891 *value++ ^= digest[d++];
5892 len--;
5893 }
5894 }
5895
5896 int find_filter(char const *name, size_t len)
5897 {
5898 int free = -1;
5899 int i;
5900
5901 for (i = 0; i < MAXFILTER; i++)
5902 {
5903 if (!*ip_filters[i].name)
5904 {
5905 if (free < 0)
5906 free = i;
5907
5908 continue;
5909 }
5910
5911 if (strlen(ip_filters[i].name) != len)
5912 continue;
5913
5914 if (!strncmp(ip_filters[i].name, name, len))
5915 return i;
5916 }
5917
5918 return free;
5919 }
5920
5921 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
5922 {
5923 switch (p->op)
5924 {
5925 case FILTER_PORT_OP_EQ: return port == p->port;
5926 case FILTER_PORT_OP_NEQ: return port != p->port;
5927 case FILTER_PORT_OP_GT: return port > p->port;
5928 case FILTER_PORT_OP_LT: return port < p->port;
5929 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
5930 }
5931
5932 return 0;
5933 }
5934
5935 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
5936 {
5937 switch (op)
5938 {
5939 case FILTER_FLAG_OP_ANY:
5940 return (flags & sflags) || (~flags & cflags);
5941
5942 case FILTER_FLAG_OP_ALL:
5943 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
5944
5945 case FILTER_FLAG_OP_EST:
5946 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
5947 }
5948
5949 return 0;
5950 }
5951
5952 int ip_filter(uint8_t *buf, int len, uint8_t filter)
5953 {
5954 uint16_t frag_offset;
5955 uint8_t proto;
5956 in_addr_t src_ip;
5957 in_addr_t dst_ip;
5958 uint16_t src_port = 0;
5959 uint16_t dst_port = 0;
5960 uint8_t flags = 0;
5961 ip_filter_rulet *rule;
5962
5963 if (len < 20) // up to end of destination address
5964 return 0;
5965
5966 if ((*buf >> 4) != 4) // IPv4
5967 return 0;
5968
5969 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
5970 proto = buf[9];
5971 src_ip = *(in_addr_t *) (buf + 12);
5972 dst_ip = *(in_addr_t *) (buf + 16);
5973
5974 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
5975 {
5976 int l = (buf[0] & 0xf) * 4; // length of IP header
5977 if (len < l + 4) // ports
5978 return 0;
5979
5980 src_port = ntohs(*(uint16_t *) (buf + l));
5981 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
5982 if (proto == IPPROTO_TCP)
5983 {
5984 if (len < l + 14) // flags
5985 return 0;
5986
5987 flags = buf[l + 13] & 0x3f;
5988 }
5989 }
5990
5991 for (rule = ip_filters[filter].rules; rule->action; rule++)
5992 {
5993 if (rule->proto != IPPROTO_IP && proto != rule->proto)
5994 continue;
5995
5996 if (rule->src_wild != INADDR_BROADCAST &&
5997 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
5998 continue;
5999
6000 if (rule->dst_wild != INADDR_BROADCAST &&
6001 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6002 continue;
6003
6004 if (frag_offset)
6005 {
6006 // layer 4 deny rules are skipped
6007 if (rule->action == FILTER_ACTION_DENY &&
6008 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6009 continue;
6010 }
6011 else
6012 {
6013 if (rule->frag)
6014 continue;
6015
6016 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6017 {
6018 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6019 continue;
6020
6021 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6022 continue;
6023
6024 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6025 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6026 continue;
6027 }
6028 }
6029
6030 // matched
6031 rule->counter++;
6032 return rule->action == FILTER_ACTION_PERMIT;
6033 }
6034
6035 // default deny
6036 return 0;
6037 }