3 // Copyright (c) 2003, 2004 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
7 char const *cvs_id_l2tpns
= "$Id: l2tpns.c,v 1.40 2004/11/04 05:08:36 bodea Exp $";
13 #include <linux/if_tun.h>
18 #include <net/route.h>
21 #include <netinet/in.h>
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
31 #include <sys/resource.h>
39 #include <sys/sysinfo.h>
47 #include "constants.h"
53 struct configt
*config
= NULL
; // all configuration
54 int tunfd
= -1; // tun interface file handle. (network device)
55 int udpfd
= -1; // UDP file handle
56 int controlfd
= -1; // Control signal handle
57 int snoopfd
= -1; // UDP file handle for sending out intercept data
58 int *radfds
= NULL
; // RADIUS requests file handles
59 int ifrfd
= -1; // File descriptor for routing, etc
60 time_t basetime
= 0; // base clock
61 char hostname
[1000] = ""; // us.
62 int tunidx
; // ifr_ifindex of tun device
63 u32 sessionid
= 0; // session id for radius accounting
64 int syslog_log
= 0; // are we logging to syslog
65 FILE *log_stream
= NULL
; // file handle for direct logging (i.e. direct into file, not via syslog).
66 extern int cluster_sockfd
; // Intra-cluster communications socket.
67 u32 last_id
= 0; // Last used PPP SID. Can I kill this?? -- mo
68 int clifd
= 0; // Socket listening for CLI connections.
70 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
71 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
73 static void *ip_hash
[256]; // Mapping from IP address to session structures.
75 u32 udp_tx
= 0, udp_rx
= 0, udp_rx_pkt
= 0; // Global traffic counters.
76 u32 eth_tx
= 0, eth_rx
= 0, eth_rx_pkt
= 0;
77 u32 ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
78 time_t time_now
= 0; // Current time in seconds since epoch.
79 char time_now_string
[64] = {0}; // Current time as a string.
80 char main_quit
= 0; // True if we're in the process of exiting.
81 char *_program_name
= NULL
;
82 linked_list
*loaded_plugins
;
83 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
87 struct bgp_peer
*bgp_peers
= 0;
88 struct bgp_route_list
*bgp_routes
= 0;
89 int bgp_configured
= 0;
92 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
93 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(struct configt, MEMBER), membersize(struct configt, MEMBER), TYPE }
95 struct config_descriptt config_values
[] = {
96 CONFIG("debug", debug
, INT
),
97 CONFIG("log_file", log_filename
, STRING
),
98 CONFIG("pid_file", pid_file
, STRING
),
99 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
100 CONFIG("primary_dns", default_dns1
, IP
),
101 CONFIG("secondary_dns", default_dns2
, IP
),
102 CONFIG("save_state", save_state
, BOOL
),
103 CONFIG("primary_radius", radiusserver
[0], IP
),
104 CONFIG("secondary_radius", radiusserver
[1], IP
),
105 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
106 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
107 CONFIG("radius_accounting", radius_accounting
, BOOL
),
108 CONFIG("radius_secret", radiussecret
, STRING
),
109 CONFIG("bind_address", bind_address
, IP
),
110 CONFIG("send_garp", send_garp
, BOOL
),
111 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
112 CONFIG("throttle_buckets", num_tbfs
, INT
),
113 CONFIG("accounting_dir", accounting_dir
, STRING
),
114 CONFIG("setuid", target_uid
, INT
),
115 CONFIG("dump_speed", dump_speed
, BOOL
),
116 CONFIG("cleanup_interval", cleanup_interval
, INT
),
117 CONFIG("multi_read_count", multi_read_count
, INT
),
118 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
119 CONFIG("lock_pages", lock_pages
, BOOL
),
120 CONFIG("icmp_rate", icmp_rate
, INT
),
121 CONFIG("cluster_address", cluster_address
, IP
),
122 CONFIG("cluster_interface", cluster_interface
, STRING
),
123 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
124 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
126 CONFIG("as_number", as_number
, SHORT
),
127 CONFIG("bgp_peer1", bgp_peer
[0], STRING
),
128 CONFIG("bgp_peer1_as", bgp_peer_as
[0], SHORT
),
129 CONFIG("bgp_peer2", bgp_peer
[1], STRING
),
130 CONFIG("bgp_peer2_as", bgp_peer_as
[1], SHORT
),
135 char *plugin_functions
[] = {
142 "plugin_new_session",
143 "plugin_kill_session",
145 "plugin_radius_response",
146 "plugin_become_master",
147 "plugin_new_session_master",
150 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
152 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
153 sessiont
*session
= NULL
; // Array of session structures.
154 sessioncountt
*sess_count
= NULL
; // Array of partial per-session traffic counters.
155 radiust
*radius
= NULL
; // Array of radius structures.
156 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
157 controlt
*controlfree
= 0;
158 struct Tstats
*_statistics
= NULL
;
160 struct Tringbuffer
*ringbuffer
= NULL
;
163 void sigalrm_handler(int);
164 void sighup_handler(int);
165 void sigterm_handler(int);
166 void sigquit_handler(int);
167 void sigchild_handler(int);
168 void read_config_file();
172 tunnelidt
new_tunnel();
173 void update_config();
174 int unhide_avp(u8
*avp
, tunnelidt t
, sessionidt s
, u16 length
);
176 static void cache_ipmap(ipt ip
, int s
);
177 static void uncache_ipmap(ipt ip
);
179 // return internal time (10ths since process startup)
184 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
187 // work out a retry time based on try number
188 // This is a straight bounded exponential backoff.
189 // Maximum re-try time is 32 seconds. (2^5).
190 clockt
backoff(u8
try)
192 if (try > 5) try = 5; // max backoff
193 return now() + 10 * (1 << try);
198 // Log a debug message.
200 void _log(int level
, ipt address
, sessionidt s
, tunnelidt t
, const char *format
, ...)
202 static char message
[65536] = {0};
203 static char message2
[65536] = {0};
209 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
210 ringbuffer
->tail
= 0;
211 if (ringbuffer
->tail
== ringbuffer
->head
)
212 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
213 ringbuffer
->head
= 0;
215 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
216 ringbuffer
->buffer
[ringbuffer
->tail
].address
= address
;
217 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
218 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
219 va_start(ap
, format
);
220 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
225 if (config
->debug
< level
) return;
227 va_start(ap
, format
);
230 vsnprintf(message2
, 65535, format
, ap
);
231 snprintf(message
, 65535, "%s %02d/%02d %s", time_now_string
, t
, s
, message2
);
232 fprintf(log_stream
, "%s", message
);
236 vsnprintf(message2
, 65535, format
, ap
);
237 snprintf(message
, 65535, "%02d/%02d %s", t
, s
, message2
);
238 syslog(level
+ 2, message
); // We don't need LOG_EMERG or LOG_ALERT
243 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
246 const u8
*d
= (const u8
*)data
;
248 if (config
->debug
< level
) return;
250 // No support for log_hex to syslog
253 _log(level
, 0, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
254 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
256 for (i
= 0; i
< maxsize
; )
258 fprintf(log_stream
, "%4X: ", i
);
259 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
261 fprintf(log_stream
, "%02X ", d
[j
]);
263 fputs(": ", log_stream
);
266 for (; j
< i
+ 16; j
++)
268 fputs(" ", log_stream
);
270 fputs(": ", log_stream
);
273 fputs(" ", log_stream
);
274 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
276 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
277 fputc(d
[j
], log_stream
);
279 fputc('.', log_stream
);
282 fputs(" ", log_stream
);
286 fputs("\n", log_stream
);
290 setbuf(log_stream
, NULL
);
297 // This adds it to the routing table, advertises it
298 // via iBGP if enabled, and stuffs it into the
299 // 'sessionbyip' cache.
301 // 'ip' and 'mask' must be in _host_ order.
303 void routeset(sessionidt s
, ipt ip
, ipt mask
, ipt gw
, u8 add
)
308 if (!mask
) mask
= 0xffffffff;
310 ip
&= mask
; // Force the ip to be the first one in the route.
312 memset(&r
, 0, sizeof(r
));
313 r
.rt_dev
= config
->tundevice
;
314 r
.rt_dst
.sa_family
= AF_INET
;
315 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
316 r
.rt_gateway
.sa_family
= AF_INET
;
317 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
318 r
.rt_genmask
.sa_family
= AF_INET
;
319 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
320 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
322 r
.rt_flags
|= RTF_GATEWAY
;
323 else if (mask
== 0xffffffff)
324 r
.rt_flags
|= RTF_HOST
;
326 log(1, ip
, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n",
328 ip
>> 24, ip
>> 16 & 0xff, ip
>> 8 & 0xff, ip
& 0xff,
329 mask
>> 24, mask
>> 16 & 0xff, mask
>> 8 & 0xff, mask
& 0xff,
330 gw
>> 24, gw
>> 16 & 0xff, gw
>> 8 & 0xff, gw
& 0xff);
332 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
333 log(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
337 bgp_add_route(htonl(ip
), htonl(mask
));
339 bgp_del_route(htonl(ip
), htonl(mask
));
342 // Add/Remove the IPs to the 'sessionbyip' cache.
343 // Note that we add the zero address in the case of
344 // a network route. Roll on CIDR.
346 // Note that 's == 0' implies this is the address pool.
347 // We still cache it here, because it will pre-fill
348 // the malloc'ed tree.
352 if (!add
) // Are we deleting a route?
353 s
= 0; // Caching the session as '0' is the same as uncaching.
355 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
361 // Set up TUN interface
365 struct sockaddr_in sin
= {0};
366 memset(&ifr
, 0, sizeof(ifr
));
367 ifr
.ifr_flags
= IFF_TUN
;
369 tunfd
= open(TUNDEVICE
, O_RDWR
);
372 log(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
376 int flags
= fcntl(tunfd
, F_GETFL
, 0);
377 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
379 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
381 log(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
384 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
385 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
386 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
388 sin
.sin_family
= AF_INET
;
389 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
390 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
392 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
394 log(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
397 /* Bump up the qlen to deal with bursts from the network */
399 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
401 log(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
404 ifr
.ifr_flags
= IFF_UP
;
405 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
407 log(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
410 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
412 log(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno
));
415 tunidx
= ifr
.ifr_ifindex
;
422 struct sockaddr_in addr
;
425 memset(&addr
, 0, sizeof(addr
));
426 addr
.sin_family
= AF_INET
;
427 addr
.sin_port
= htons(L2TPPORT
);
428 addr
.sin_addr
.s_addr
= config
->bind_address
;
429 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
430 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
432 int flags
= fcntl(udpfd
, F_GETFL
, 0);
433 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
435 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
437 log(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
440 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
443 memset(&addr
, 0, sizeof(addr
));
444 addr
.sin_family
= AF_INET
;
445 addr
.sin_port
= htons(1702);
446 controlfd
= socket(AF_INET
, SOCK_DGRAM
, 17);
447 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
448 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
450 log(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
456 // Find session by IP, < 1 for not found
458 // Confusingly enough, this 'ip' must be
459 // in _network_ order. This being the common
460 // case when looking it up from IP packet headers.
462 // We actually use this cache for two things.
463 // #1. For used IP addresses, this maps to the
464 // session ID that it's used by.
465 // #2. For un-used IP addresses, this maps to the
466 // index into the pool table that contains that
470 int lookup_ipmap(ipt ip
)
473 char **d
= (char **) ip_hash
;
476 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
477 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
478 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
480 s
= (ipt
) d
[(size_t) *a
];
484 sessionidt
sessionbyip(ipt ip
)
486 int s
= lookup_ipmap(ip
);
487 CSTAT(call_sessionbyip
);
489 if (s
> 0 && s
< MAXSESSION
&& session
[s
].tunnel
)
495 // Take an IP address in HOST byte order and
496 // add it to the sessionid by IP cache.
498 // (It's actually cached in network order)
500 static void cache_ipmap(ipt ip
, int s
)
502 ipt nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0]
504 char **d
= (char **) ip_hash
;
507 for (i
= 0; i
< 3; i
++)
509 if (!d
[(size_t) a
[i
]])
511 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof (void *))))
515 d
= (char **) d
[(size_t) a
[i
]];
518 d
[(size_t) a
[3]] = (char *)((int)s
);
521 log(4, ip
, s
, session
[s
].tunnel
, "Caching ip address %s\n", inet_toa(nip
));
523 log(4, ip
, 0, 0, "Un-caching ip address %s\n", inet_toa(nip
));
524 // else a map to an ip pool index.
527 static void uncache_ipmap(ipt ip
)
529 cache_ipmap(ip
, 0); // Assign it to the NULL session.
533 // CLI list to dump current ipcache.
535 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
537 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
541 if (CLI_HELP_REQUESTED
)
542 return CLI_HELP_NO_ARGS
;
544 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
546 for (i
= 0; i
< 256; ++i
)
551 for (j
= 0; j
< 256; ++j
)
556 for (k
= 0; k
< 256; ++k
)
561 for (l
= 0; l
< 256; ++l
)
565 cli_print(cli
, "%7d %d.%d.%d.%d", (int) g
[l
], i
, j
, k
, l
);
571 cli_print(cli
, "%d entries in cache", count
);
576 // Find session by username, 0 for not found
577 // walled garden users aren't authenticated, so the username is
578 // reasonably useless. Ignore them to avoid incorrect actions
580 // This is VERY inefficent. Don't call it often. :)
582 sessionidt
sessionbyuser(char *username
)
585 CSTAT(call_sessionbyuser
);
587 for (s
= 1; s
< MAXSESSION
; ++s
)
589 if (session
[s
].walled_garden
)
590 continue; // Skip walled garden users.
592 if (!strncmp(session
[s
].user
, username
, 128))
596 return 0; // Not found.
599 void send_garp(ipt ip
)
605 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
608 log(0, 0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
611 memset(&ifr
, 0, sizeof(ifr
));
612 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
613 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
615 log(0, 0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
619 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
620 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
622 log(0, 0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
627 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
630 // Find session by username, 0 for not found
631 sessiont
*sessiontbysessionidt(sessionidt s
)
633 if (!s
|| s
> MAXSESSION
) return NULL
;
637 sessionidt
sessionidtbysessiont(sessiont
*s
)
639 sessionidt val
= s
-session
;
640 if (s
< session
|| val
> MAXSESSION
) return 0;
644 // actually send a control message for a specific tunnel
645 void tunnelsend(u8
* buf
, u16 l
, tunnelidt t
)
647 struct sockaddr_in addr
;
649 CSTAT(call_tunnelsend
);
653 static int backtrace_count
= 0;
654 log(0, 0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
655 STAT(tunnel_tx_errors
);
656 log_backtrace(backtrace_count
, 5)
662 static int backtrace_count
= 0;
663 log(1, 0, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
664 log_backtrace(backtrace_count
, 5)
665 STAT(tunnel_tx_errors
);
668 memset(&addr
, 0, sizeof(addr
));
669 addr
.sin_family
= AF_INET
;
670 *(u32
*) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
671 addr
.sin_port
= htons(tunnel
[t
].port
);
673 // sequence expected, if sequence in message
674 if (*buf
& 0x08) *(u16
*) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
676 // If this is a control message, deal with retries
679 tunnel
[t
].last
= time_now
; // control message sent
680 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
681 if (tunnel
[t
].try > 1)
683 STAT(tunnel_retries
);
684 log(3, tunnel
[t
].ip
, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
688 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
690 log(0, tunnel
[t
].ip
, ntohs((*(u16
*) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
691 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
692 STAT(tunnel_tx_errors
);
696 log_hex(5, "Send Tunnel Data", buf
, l
);
697 STAT(tunnel_tx_packets
);
698 INC_STAT(tunnel_tx_bytes
, l
);
702 // Tiny helper function to write data to
705 int tun_write(u8
* data
, int size
)
707 return write(tunfd
, data
, size
);
710 // process outgoing (to tunnel) IP
712 void processipout(u8
* buf
, int len
)
719 char * data
= buf
; // Keep a copy of the originals.
724 CSTAT(call_processipout
);
726 if (len
< MIN_IP_SIZE
)
728 log(1, 0, 0, 0, "Short IP, %d bytes\n", len
);
729 STAT(tunnel_tx_errors
);
734 log(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len
);
735 STAT(tunnel_tx_errors
);
739 // Skip the tun header
743 // Got an IP header now
744 if (*(u8
*)(buf
) >> 4 != 4)
746 log(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
750 ip
= *(u32
*)(buf
+ 16);
751 if (!(s
= sessionbyip(ip
)))
753 // Is this a packet for a session that doesn't exist?
754 static int rate
= 0; // Number of ICMP packets we've sent this second.
755 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
757 if (last
!= time_now
)
763 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
765 log(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32
*)(buf
+ 12)));
766 host_unreachable(*(u32
*)(buf
+ 12), *(u16
*)(buf
+ 4), ip
, buf
, (len
< 64) ? 64 : len
);
770 t
= session
[s
].tunnel
;
775 // Are we throttling this session?
776 if (config
->cluster_iam_master
)
777 tbf_queue_packet(sp
->tbf_out
, data
, size
);
779 master_throttle_packet(sp
->tbf_out
, data
, size
);
782 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
784 // We are walled-gardening this
785 master_garden_packet(s
, data
, size
);
789 // Snooping this session, send it to intercept box
790 if (sp
->snoop_ip
&& sp
->snoop_port
)
791 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
793 log(5, session
[s
].ip
, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
795 // Add on L2TP header
797 u8
*p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
800 log(3, session
[s
].ip
, s
, t
, "failed to send packet in processipout.\n");
803 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
806 sp
->cout
+= len
; // byte count
807 sp
->total_cout
+= len
; // byte count
810 sess_count
[s
].cout
+= len
; // To send to master..
814 // Helper routine for the TBF filters.
815 // Used to send queued data in to the user!
817 void send_ipout(sessionidt s
, u8
*buf
, int len
)
825 if (len
< 0 || len
> MAXETHER
)
827 log(1,0,0,0, "Odd size IP packet: %d bytes\n", len
);
831 // Skip the tun header
835 ip
= *(u32
*)(buf
+ 16);
839 t
= session
[s
].tunnel
;
842 log(5, session
[s
].ip
, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
844 // Snooping this session.
845 if (sp
->snoop_ip
&& sp
->snoop_port
)
846 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
848 // Add on L2TP header
850 u8
*p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
853 log(3, session
[s
].ip
, s
, t
, "failed to send packet in send_ipout.\n");
856 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
858 sp
->cout
+= len
; // byte count
859 sp
->total_cout
+= len
; // byte count
862 sess_count
[s
].cout
+= len
; // To send to master..
865 // add an AVP (16 bit)
866 void control16(controlt
* c
, u16 avp
, u16 val
, u8 m
)
868 u16 l
= (m
? 0x8008 : 0x0008);
869 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
870 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
871 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
872 *(u16
*) (c
->buf
+ c
->length
+ 6) = htons(val
);
876 // add an AVP (32 bit)
877 void control32(controlt
* c
, u16 avp
, u32 val
, u8 m
)
879 u16 l
= (m
? 0x800A : 0x000A);
880 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
881 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
882 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
883 *(u32
*) (c
->buf
+ c
->length
+ 6) = htonl(val
);
887 // add an AVP (32 bit)
888 void controls(controlt
* c
, u16 avp
, char *val
, u8 m
)
890 u16 l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
891 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
892 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
893 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
894 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
895 c
->length
+= 6 + strlen(val
);
899 void controlb(controlt
* c
, u16 avp
, char *val
, unsigned int len
, u8 m
)
901 u16 l
= ((m
? 0x8000 : 0) + len
+ 6);
902 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
903 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
904 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
905 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
906 c
->length
+= 6 + len
;
909 // new control connection
910 controlt
*controlnew(u16 mtype
)
914 c
= malloc(sizeof(controlt
));
918 controlfree
= c
->next
;
922 *(u16
*) (c
->buf
+ 0) = htons(0xC802); // flags/ver
924 control16(c
, 0, mtype
, 1);
928 // send zero block if nothing is waiting
930 void controlnull(tunnelidt t
)
933 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
936 *(u16
*) (buf
+ 0) = htons(0xC802); // flags/ver
937 *(u16
*) (buf
+ 2) = htons(12); // length
938 *(u16
*) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
939 *(u16
*) (buf
+ 6) = htons(0); // session
940 *(u16
*) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
941 *(u16
*) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
942 tunnelsend(buf
, 12, t
);
945 // add a control message to a tunnel, and send if within window
946 void controladd(controlt
* c
, tunnelidt t
, sessionidt s
)
948 *(u16
*) (c
->buf
+ 2) = htons(c
->length
); // length
949 *(u16
*) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
950 *(u16
*) (c
->buf
+ 6) = htons(s
? session
[s
].far
: 0); // session
951 *(u16
*) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
952 tunnel
[t
].ns
++; // advance sequence
953 // link in message in to queue
954 if (tunnel
[t
].controlc
)
955 tunnel
[t
].controle
->next
= c
;
957 tunnel
[t
].controls
= c
;
958 tunnel
[t
].controle
= c
;
959 tunnel
[t
].controlc
++;
960 // send now if space in window
961 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
963 tunnel
[t
].try = 0; // first send
964 tunnelsend(c
->buf
, c
->length
, t
);
969 // Throttle or Unthrottle a session
971 // Throttle the data from/to through a session to no more than
972 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
975 // If either value is -1, the current value is retained for that
978 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
980 if (!session
[s
].tunnel
)
981 return; // No-one home.
983 if (!*session
[s
].user
)
984 return; // User not logged in
988 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
989 if (session
[s
].tbf_in
)
990 free_tbf(session
[s
].tbf_in
);
993 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
995 session
[s
].tbf_in
= 0;
997 session
[s
].throttle_in
= rate_in
;
1002 int bytes
= rate_out
* 1024 / 8;
1003 if (session
[s
].tbf_out
)
1004 free_tbf(session
[s
].tbf_out
);
1007 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1009 session
[s
].tbf_out
= 0;
1011 session
[s
].throttle_out
= rate_out
;
1015 // start tidy shutdown of session
1016 void sessionshutdown(sessionidt s
, char *reason
)
1018 int dead
= session
[s
].die
;
1019 int walled_garden
= session
[s
].walled_garden
;
1022 CSTAT(call_sessionshutdown
);
1024 if (!session
[s
].tunnel
)
1026 log(3, session
[s
].ip
, s
, session
[s
].tunnel
, "Called sessionshutdown on a session with no tunnel.\n");
1027 return; // not a live session
1031 log(2, 0, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1033 session
[s
].die
= now() + 150; // Clean up in 15 seconds
1036 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1037 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1040 // RADIUS Stop message
1041 if (session
[s
].opened
&& !walled_garden
&& !dead
)
1043 u16 r
= session
[s
].radius
;
1046 if (!(r
= radiusnew(s
)))
1048 log(1, 0, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1049 STAT(radius_overflow
);
1054 for (n
= 0; n
< 15; n
++)
1055 radius
[r
].auth
[n
] = rand();
1058 if (r
&& radius
[r
].state
!= RADIUSSTOP
)
1059 radiussend(r
, RADIUSSTOP
); // stop, if not already trying
1063 { // IP allocated, clear and unroute
1065 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1067 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, session
[s
].ip
, 0);
1068 session
[s
].route
[r
].ip
= 0;
1071 if (session
[s
].ip_pool_index
== -1) // static ip
1073 routeset(s
, session
[s
].ip
, 0, 0, 0); // Delete route.
1080 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1081 throttle_session(s
, 0, 0);
1084 controlt
*c
= controlnew(14); // sending CDN
1085 control16(c
, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message
1086 control16(c
, 14, s
, 1); // assigned session (our end)
1087 controladd(c
, session
[s
].tunnel
, s
); // send the message
1090 cluster_send_session(s
);
1093 void sendipcp(tunnelidt t
, sessionidt s
)
1096 u16 r
= session
[s
].radius
;
1099 CSTAT(call_sendipcp
);
1104 if (radius
[r
].state
!= RADIUSIPCP
)
1106 radius
[r
].state
= RADIUSIPCP
;
1110 radius
[r
].retry
= backoff(radius
[r
].try++);
1111 if (radius
[r
].try > 10)
1113 radiusclear(r
, s
); // Clear radius session.
1114 sessionshutdown(s
, "No reply on IPCP");
1118 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1121 log(3, session
[s
].ip
, s
, t
, "failed to send packet in sendipcp.\n");
1126 q
[1] = r
<< RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1127 *(u16
*) (q
+ 2) = htons(10);
1130 *(u32
*) (q
+ 6) = config
->bind_address
? config
->bind_address
: my_address
; // send my IP
1131 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1132 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1135 // kill a session now
1136 void sessionkill(sessionidt s
, char *reason
)
1139 CSTAT(call_sessionkill
);
1141 session
[s
].die
= now();
1142 sessionshutdown(s
, reason
); // close radius/routes, etc.
1143 if (session
[s
].radius
)
1144 radiusclear(session
[s
].radius
, s
); // cant send clean accounting data, session is killed
1146 log(2, 0, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1148 memset(&session
[s
], 0, sizeof(session
[s
]));
1149 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1150 session
[s
].next
= sessionfree
;
1152 cli_session_actions
[s
].action
= 0;
1153 cluster_send_session(s
);
1156 // kill a tunnel now
1157 void tunnelkill(tunnelidt t
, char *reason
)
1162 CSTAT(call_tunnelkill
);
1164 tunnel
[t
].state
= TUNNELDIE
;
1166 // free control messages
1167 while ((c
= tunnel
[t
].controls
))
1169 controlt
* n
= c
->next
;
1170 tunnel
[t
].controls
= n
;
1171 tunnel
[t
].controlc
--;
1172 c
->next
= controlfree
;
1176 for (s
= 1; s
< MAXSESSION
; s
++)
1177 if (session
[s
].tunnel
== t
)
1178 sessionkill(s
, reason
);
1182 log(1, 0, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1183 cli_tunnel_actions
[s
].action
= 0;
1184 cluster_send_tunnel(t
);
1187 // shut down a tunnel cleanly
1188 void tunnelshutdown(tunnelidt t
, char *reason
)
1192 CSTAT(call_tunnelshutdown
);
1194 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1196 // never set up, can immediately kill
1197 tunnelkill(t
, reason
);
1200 log(1, 0, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1203 for (s
= 1; s
< MAXSESSION
; s
++)
1204 if (session
[s
].tunnel
== t
)
1205 sessionkill(s
, reason
);
1207 tunnel
[t
].state
= TUNNELDIE
;
1208 tunnel
[t
].die
= now() + 700; // Clean up in 70 seconds
1209 cluster_send_tunnel(t
);
1210 // TBA - should we wait for sessions to stop?
1212 controlt
*c
= controlnew(4); // sending StopCCN
1213 control16(c
, 1, 1, 1); // result code (admin reasons - TBA make error, general error, add message
1214 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1215 controladd(c
, t
, 0); // send the message
1219 // read and process packet on tunnel (UDP)
1220 void processudp(u8
* buf
, int len
, struct sockaddr_in
*addr
)
1222 char *chapresponse
= NULL
;
1223 u16 l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1227 CSTAT(call_processudp
);
1231 log_hex(5, "UDP Data", buf
, len
);
1232 STAT(tunnel_rx_packets
);
1233 INC_STAT(tunnel_rx_bytes
, len
);
1236 log(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Short UDP, %d bytes\n", len
);
1237 STAT(tunnel_rx_errors
);
1240 if ((buf
[1] & 0x0F) != 2)
1242 log(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1243 STAT(tunnel_rx_errors
);
1248 l
= ntohs(*(u16
*) p
);
1251 t
= ntohs(*(u16
*) p
);
1253 s
= ntohs(*(u16
*) p
);
1255 if (s
>= MAXSESSION
)
1257 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Received UDP packet with invalid session ID\n");
1258 STAT(tunnel_rx_errors
);
1263 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Received UDP packet with invalid tunnel ID\n");
1264 STAT(tunnel_rx_errors
);
1269 ns
= ntohs(*(u16
*) p
);
1271 nr
= ntohs(*(u16
*) p
);
1276 u16 o
= ntohs(*(u16
*) p
);
1281 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Bad length %d>%d\n", (p
- buf
), l
);
1282 STAT(tunnel_rx_errors
);
1288 u16 message
= 0xFFFF; // message type
1290 u8 mandatorymessage
= 0;
1291 u8 chap
= 0; // if CHAP being used
1292 u16 asession
= 0; // assigned session
1293 u32 amagic
= 0; // magic number
1294 u8 aflags
= 0; // flags from last LCF
1295 u16 version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1296 int requestchap
= 0; // do we request PAP instead of original CHAP request?
1297 char called
[MAXTEL
] = ""; // called number
1298 char calling
[MAXTEL
] = ""; // calling number
1300 if (!config
->cluster_iam_master
)
1302 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1306 if ((*buf
& 0xCA) != 0xC8)
1308 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Bad control header %02X\n", *buf
);
1309 STAT(tunnel_rx_errors
);
1312 log(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1313 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1314 // if no tunnel specified, assign one
1320 // Is this a duplicate of the first packet? (SCCRQ)
1322 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1324 if (tunnel
[i
].state
!= TUNNELOPENING
||
1325 tunnel
[i
].ip
!= ntohl(*(ipt
*) & addr
->sin_addr
) ||
1326 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1335 if (!(t
= new_tunnel()))
1337 log(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "No more tunnels\n");
1338 STAT(tunnel_overflow
);
1342 tunnel
[t
].ip
= ntohl(*(ipt
*) & addr
->sin_addr
);
1343 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1344 tunnel
[t
].window
= 4; // default window
1345 log(1, ntohl(addr
->sin_addr
.s_addr
), 0, t
, " New tunnel from %u.%u.%u.%u/%u ID %d\n", tunnel
[t
].ip
>> 24, tunnel
[t
].ip
>> 16 & 255, tunnel
[t
].ip
>> 8 & 255, tunnel
[t
].ip
& 255, tunnel
[t
].port
, t
);
1346 STAT(tunnel_created
);
1349 // This is used to time out old tunnels
1350 tunnel
[t
].lastrec
= time_now
;
1352 // check sequence of this message
1354 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1355 // some to clear maybe?
1356 while (tunnel
[t
].controlc
&& (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1358 controlt
*c
= tunnel
[t
].controls
;
1359 tunnel
[t
].controls
= c
->next
;
1360 tunnel
[t
].controlc
--;
1361 c
->next
= controlfree
;
1364 tunnel
[t
].try = 0; // we have progress
1367 // If the 'ns' just received is not the 'nr' we're
1368 // expecting, just send an ack and drop it.
1370 // if 'ns' is less, then we got a retransmitted packet.
1371 // if 'ns' is greater than missed a packet. Either way
1372 // we should ignore it.
1373 if (ns
!= tunnel
[t
].nr
)
1375 // is this the sequence we were expecting?
1376 log(1, ntohl(addr
->sin_addr
.s_addr
), 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n", t
, ns
, tunnel
[t
].nr
);
1377 STAT(tunnel_rx_errors
);
1379 if (l
) // Is this not a ZLB?
1383 // receiver advance (do here so quoted correctly in any sends below)
1384 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1385 if (skip
< 0) skip
= 0;
1386 if (skip
< tunnel
[t
].controlc
)
1388 // some control packets can now be sent that were previous stuck out of window
1389 int tosend
= tunnel
[t
].window
- skip
;
1390 controlt
*c
= tunnel
[t
].controls
;
1398 tunnel
[t
].try = 0; // first send
1399 tunnelsend(c
->buf
, c
->length
, t
);
1404 if (!tunnel
[t
].controlc
)
1405 tunnel
[t
].retry
= 0; // caught up
1408 { // if not a null message
1410 while (l
&& !(fatal
& 0x80))
1412 u16 n
= (ntohs(*(u16
*) p
) & 0x3FF);
1419 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Invalid length in AVP\n");
1420 STAT(tunnel_rx_errors
);
1427 // handle hidden AVPs
1428 if (!*config
->l2tpsecret
)
1430 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1434 if (!session
[s
].random_vector_length
)
1436 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP requested, but no random vector.\n");
1440 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP\n");
1442 n
= unhide_avp(b
, t
, s
, n
);
1451 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1458 log(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown AVP vendor %d\n", ntohs(*(u16
*) (b
)));
1463 mtype
= ntohs(*(u16
*) (b
));
1467 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " AVP %d (%s) len %d\n", mtype
, avpnames
[mtype
], n
);
1470 case 0: // message type
1471 message
= ntohs(*(u16
*) b
);
1472 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Message type = %d (%s)\n", *b
,
1473 l2tp_message_types
[message
]);
1474 mandatorymessage
= flags
;
1476 case 1: // result code
1478 u16 rescode
= ntohs(*(u16
*)(b
));
1479 const char* resdesc
= "(unknown)";
1482 if (rescode
<= MAX_STOPCCN_RESULT_CODE
)
1483 resdesc
= stopccn_result_codes
[rescode
];
1485 else if (message
== 14)
1487 if (rescode
<= MAX_CDN_RESULT_CODE
)
1488 resdesc
= cdn_result_codes
[rescode
];
1491 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Result Code %d: %s\n",
1495 u16 errcode
= ntohs(*(u16
*)(b
+ 2));
1496 const char* errdesc
= "(unknown)";
1497 if (errcode
<= MAX_ERROR_CODE
)
1498 errdesc
= error_codes
[errcode
];
1499 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Error Code %d: %s\n",
1503 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Error String: %.*s\n",
1509 case 2: // protocol version
1511 version
= ntohs(*(u16
*) (b
));
1512 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Protocol version = %d\n", version
);
1513 if (version
&& version
!= 0x0100)
1514 { // allow 0.0 and 1.0
1515 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Bad protocol version %04X\n",
1522 case 3: // framing capabilities
1523 // log(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
1525 case 4: // bearer capabilities
1526 // log(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n");
1528 case 5: // tie breaker
1529 // We never open tunnels, so we don't care about tie breakers
1530 // log(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
1532 case 6: // firmware revision
1533 // log(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
1535 case 7: // host name
1536 memset(tunnel
[t
].hostname
, 0, 128);
1537 memcpy(tunnel
[t
].hostname
, b
, (n
>= 127) ? 127 : n
);
1538 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
1539 // TBA - to send to RADIUS
1541 case 8: // vendor name
1542 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
1543 memcpy(tunnel
[t
].vendor
, b
, (n
>= sizeof(tunnel
[t
].vendor
) - 1) ? sizeof(tunnel
[t
].vendor
) - 1 : n
);
1544 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
1546 case 9: // assigned tunnel
1547 tunnel
[t
].far
= ntohs(*(u16
*) (b
));
1548 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
1550 case 10: // rx window
1551 tunnel
[t
].window
= ntohs(*(u16
*) (b
));
1552 if (!tunnel
[t
].window
)
1553 tunnel
[t
].window
= 1; // window of 0 is silly
1554 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " rx window = %d\n", tunnel
[t
].window
);
1556 case 11: // Challenge
1558 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " LAC requested CHAP authentication for tunnel\n");
1559 build_chap_response(b
, 2, n
, &chapresponse
);
1562 case 13: // Response
1563 // Why did they send a response? We never challenge.
1564 log(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " received unexpected challenge response\n");
1567 case 14: // assigned session
1568 asession
= session
[s
].far
= ntohs(*(u16
*) (b
));
1569 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " assigned session = %d\n", asession
);
1571 case 15: // call serial number
1572 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " call serial number = %d\n", ntohl(*(u32
*)b
));
1574 case 18: // bearer type
1575 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " bearer type = %d\n", ntohl(*(u32
*)b
));
1578 case 19: // framing type
1579 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " framing type = %d\n", ntohl(*(u32
*)b
));
1582 case 21: // called number
1583 memset(called
, 0, MAXTEL
);
1584 memcpy(called
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
1585 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Called <%s>\n", called
);
1587 case 22: // calling number
1588 memset(calling
, 0, MAXTEL
);
1589 memcpy(calling
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
1590 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Calling <%s>\n", calling
);
1594 case 24: // tx connect speed
1597 session
[s
].tx_connect_speed
= ntohl(*(u32
*)b
);
1601 // AS5300s send connect speed as a string
1603 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
1604 session
[s
].tx_connect_speed
= atol(tmp
);
1606 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " TX connect speed <%u>\n",
1607 session
[s
].tx_connect_speed
);
1609 case 38: // rx connect speed
1612 session
[s
].rx_connect_speed
= ntohl(*(u32
*)b
);
1616 // AS5300s send connect speed as a string
1618 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
1619 session
[s
].rx_connect_speed
= atol(tmp
);
1621 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " RX connect speed <%u>\n",
1622 session
[s
].rx_connect_speed
);
1624 case 25: // Physical Channel ID
1626 u32 tmp
= ntohl(*(u32
*)b
);
1627 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Physical Channel ID <%X>\n", tmp
);
1630 case 29: // Proxy Authentication Type
1632 u16 authtype
= ntohs(*(u16
*)b
);
1633 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Type %d (%s)\n",
1634 authtype
, authtypes
[authtype
]);
1635 requestchap
= (authtype
== 2);
1638 case 30: // Proxy Authentication Name
1640 char authname
[64] = {0};
1641 memcpy(authname
, b
, (n
> 63) ? 63 : n
);
1642 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Name (%s)\n",
1646 case 31: // Proxy Authentication Challenge
1648 memcpy(radius
[session
[s
].radius
].auth
, b
, 16);
1649 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Challenge\n");
1652 case 32: // Proxy Authentication ID
1654 u16 authid
= ntohs(*(u16
*)(b
));
1655 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth ID (%d)\n",
1657 if (session
[s
].radius
)
1658 radius
[session
[s
].radius
].id
= authid
;
1661 case 33: // Proxy Authentication Response
1663 char authresp
[64] = {0};
1664 memcpy(authresp
, b
, (n
> 63) ? 63 : n
);
1665 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Response\n");
1668 case 27: // last send lcp
1669 { // find magic number
1670 u8
*p
= b
, *e
= p
+ n
;
1671 while (p
< e
&& p
[1])
1673 if (*p
== 5 && p
[1] == 6)
1674 amagic
= ntohl(*(u32
*) (p
+ 2));
1675 else if (*p
== 3 && p
[1] == 5 && *(u16
*) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5)
1678 aflags
|= SESSIONPFC
;
1680 aflags
|= SESSIONACFC
;
1685 char tmp
[500] = {0};
1687 memcpy((tmp
+ 1), b
, n
);
1691 case 28: // last recv lcp confreq
1693 char tmp
[500] = {0};
1695 memcpy((tmp
+ 1), b
, n
);
1698 case 26: // Initial Received LCP CONFREQ
1700 char tmp
[500] = {0};
1702 memcpy((tmp
+ 1), b
, n
);
1705 case 39: // seq required - we control it as an LNS anyway...
1707 case 36: // Random Vector
1708 log(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
1709 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
1710 memcpy(session
[s
].random_vector
, b
, n
);
1711 session
[s
].random_vector_length
= n
;
1714 log(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Unknown AVP type %d\n", mtype
);
1721 tunnelshutdown(t
, "Unknown Mandatory AVP");
1725 case 1: // SCCRQ - Start Control Connection Request
1727 controlt
*c
= controlnew(2); // sending SCCRP
1728 control16(c
, 2, version
, 1); // protocol version
1729 control32(c
, 3, 3, 1); // framing
1730 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
1731 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
1732 control16(c
, 9, t
, 1); // assigned tunnel
1733 controladd(c
, t
, s
); // send the resply
1735 tunnel
[t
].state
= TUNNELOPENING
;
1738 tunnel
[t
].state
= TUNNELOPEN
;
1741 tunnel
[t
].state
= TUNNELOPEN
;
1742 controlnull(t
); // ack
1745 controlnull(t
); // ack
1746 tunnelshutdown(t
, "Stopped"); // Shut down cleanly
1747 tunnelkill(t
, "Stopped"); // Immediately force everything dead
1750 controlnull(t
); // simply ACK
1764 STAT(session_overflow
);
1765 tunnelshutdown(t
, "No free sessions");
1773 sessionfree
= session
[s
].next
;
1774 memset(&session
[s
], 0, sizeof(session
[s
]));
1776 if (s
> config
->cluster_highest_sessionid
)
1777 config
->cluster_highest_sessionid
= s
;
1779 // make a RADIUS session
1780 if (!(r
= radiusnew(s
)))
1782 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "No free RADIUS sessions for ICRQ\n");
1783 sessionkill(s
, "no free RADIUS sesions");
1787 c
= controlnew(11); // sending ICRP
1788 session
[s
].id
= sessionid
++;
1789 session
[s
].opened
= time(NULL
);
1790 session
[s
].tunnel
= t
;
1791 session
[s
].far
= asession
;
1792 session
[s
].last_packet
= time_now
;
1793 log(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
1794 control16(c
, 14, s
, 1); // assigned session
1795 controladd(c
, t
, s
); // send the reply
1797 // Generate a random challenge
1799 for (n
= 0; n
< 15; n
++)
1800 radius
[r
].auth
[n
] = rand();
1802 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
1803 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
1804 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
1805 STAT(session_created
);
1812 if (amagic
== 0) amagic
= time_now
;
1813 session
[s
].magic
= amagic
; // set magic number
1814 session
[s
].l2tp_flags
= aflags
; // set flags received
1815 log(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
1816 controlnull(t
); // ack
1817 // In CHAP state, request PAP instead
1822 controlnull(t
); // ack
1823 sessionshutdown(s
, "Closed (Received CDN)");
1826 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Missing message type\n");
1829 STAT(tunnel_rx_errors
);
1830 if (mandatorymessage
& 0x80)
1831 tunnelshutdown(t
, "Unknown message");
1833 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown message type %d\n", message
);
1836 if (chapresponse
) free(chapresponse
);
1837 cluster_send_tunnel(t
);
1841 log(4, 0, s
, t
, " Got a ZLB ack\n");
1848 log_hex(5, "Receive Tunnel Data", p
, l
);
1849 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
1850 { // HDLC address header, discard
1856 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Short ppp length %d\n", l
);
1857 STAT(tunnel_rx_errors
);
1867 prot
= ntohs(*(u16
*) p
);
1872 if (s
&& !session
[s
].tunnel
) // Is something wrong??
1874 if (!config
->cluster_iam_master
)
1876 // Pass it off to the master to deal with..
1877 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1882 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "UDP packet contains session %d "
1883 "but no session[%d].tunnel exists (LAC said"
1884 " tunnel = %d). Dropping packet.\n", s
, s
, t
);
1885 STAT(tunnel_rx_errors
);
1891 log(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
1892 // I'm pretty sure this isn't right -- mo.
1893 // return; // closing session, PPP not processed
1897 session
[s
].last_packet
= time_now
;
1898 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1899 processpap(t
, s
, p
, l
);
1901 else if (prot
== PPPCHAP
)
1903 session
[s
].last_packet
= time_now
;
1904 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1905 processchap(t
, s
, p
, l
);
1907 else if (prot
== PPPLCP
)
1909 session
[s
].last_packet
= time_now
;
1910 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1911 processlcp(t
, s
, p
, l
);
1913 else if (prot
== PPPIPCP
)
1915 session
[s
].last_packet
= time_now
;
1916 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1917 processipcp(t
, s
, p
, l
);
1919 else if (prot
== PPPCCP
)
1921 session
[s
].last_packet
= time_now
;
1922 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1923 processccp(t
, s
, p
, l
);
1925 else if (prot
== PPPIP
)
1927 if (!config
->cluster_iam_master
)
1929 // We're a slave. Should we forward this packet to the master?
1931 // Is this a walled garden session, or something that needs it's
1932 // idle time updated??
1934 // Maintain the idle timeouts on the master. If this would
1935 // significantly reset the idletimeout, run it via the master
1936 // to refresh the master's idle timer.
1937 // Not sure this is ideal: It may re-order packets.
1939 if (session
[s
].walled_garden
|| (session
[s
].last_packet
+ (ECHO_TIMEOUT
/2)) < time_now
)
1941 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1942 session
[s
].last_packet
= time_now
;
1945 // fall through to processipin.
1947 session
[s
].last_packet
= time_now
;
1948 processipin(t
, s
, p
, l
);
1952 STAT(tunnel_rx_errors
);
1953 log(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown PPP protocol %04X\n", prot
);
1958 // read and process packet on tun
1959 void processtun(u8
* buf
, int len
)
1961 log_hex(5, "Receive TUN Data", buf
, len
);
1962 STAT(tun_rx_packets
);
1963 INC_STAT(tun_rx_bytes
, len
);
1965 CSTAT(call_processtun
);
1971 log(1, 0, 0, 0, "Short tun packet %d bytes\n", len
);
1972 STAT(tun_rx_errors
);
1976 if (*(u16
*) (buf
+ 2) == htons(PKTIP
)) // IP
1977 processipout(buf
, len
);
1982 // Maximum number of actions to complete.
1983 // This is to avoid sending out too many packets
1985 #define MAX_ACTIONS 500
1987 int regular_cleanups(void)
1989 static sessionidt s
= 0; // Next session to check for actions on.
1993 static clockt next_acct
= 0;
1996 log(3, 0, 0, 0, "Begin regular cleanup\n");
1998 for (r
= 1; r
< MAXRADIUS
; r
++)
2000 if (!radius
[r
].state
)
2002 if (radius
[r
].retry
)
2004 if (radius
[r
].retry
<= TIME
)
2007 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
2009 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
2011 // check for expired tunnels
2012 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2014 STAT(tunnel_timeout
);
2015 tunnelkill(t
, "Expired");
2018 // check for message resend
2019 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2021 // resend pending messages as timeout on reply
2022 if (tunnel
[t
].retry
<= TIME
)
2024 controlt
*c
= tunnel
[t
].controls
;
2025 u8 w
= tunnel
[t
].window
;
2026 tunnel
[t
].try++; // another try
2027 if (tunnel
[t
].try > 5)
2028 tunnelkill(t
, "Timeout on control message"); // game over
2032 tunnelsend(c
->buf
, c
->length
, t
);
2038 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2040 controlt
*c
= controlnew(6); // sending HELLO
2041 controladd(c
, t
, 0); // send the message
2042 log(3, tunnel
[t
].ip
, 0, t
, "Sending HELLO message\n");
2045 // Check for tunnel changes requested from the CLI
2046 if ((a
= cli_tunnel_actions
[t
].action
))
2048 cli_tunnel_actions
[t
].action
= 0;
2049 if (a
& CLI_TUN_KILL
)
2051 log(2, tunnel
[t
].ip
, 0, t
, "Dropping tunnel by CLI\n");
2052 tunnelshutdown(t
, "Requested by administrator");
2059 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2062 if (s
> config
->cluster_highest_sessionid
)
2065 if (!session
[s
].tunnel
) // Session isn't in use
2068 if (!session
[s
].die
&& session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2070 // IPCP has not completed yet. Resend
2071 log(3, session
[s
].ip
, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2072 sendipcp(session
[s
].tunnel
, s
);
2075 // check for expired sessions
2076 if (session
[s
].die
&& session
[s
].die
<= TIME
)
2078 sessionkill(s
, "Expired");
2079 if (++count
>= MAX_ACTIONS
) break;
2083 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2084 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2086 sessionkill(s
, "No response to LCP ECHO requests");
2087 STAT(session_timeout
);
2088 if (++count
>= MAX_ACTIONS
) break;
2092 // No data in IDLE_TIMEOUT seconds, send LCP ECHO
2093 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2095 u8 b
[MAXCONTROL
] = {0};
2097 u8
*q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2100 log(3, session
[s
].ip
, s
, t
, "failed to send ECHO packet.\n");
2105 *(u8
*)(q
+ 1) = (time_now
% 255); // ID
2106 *(u16
*)(q
+ 2) = htons(8); // Length
2107 *(u32
*)(q
+ 4) = 0; // Magic Number (not supported)
2109 log(4, session
[s
].ip
, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2110 (int)(time_now
- session
[s
].last_packet
));
2111 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2112 if (++count
>= MAX_ACTIONS
) break;
2115 // Check for actions requested from the CLI
2116 if ((a
= cli_session_actions
[s
].action
))
2120 cli_session_actions
[s
].action
= 0;
2121 if (a
& CLI_SESS_KILL
)
2123 log(2, 0, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2124 sessionshutdown(s
, "Requested by administrator");
2125 a
= 0; // dead, no need to check for other actions
2128 if (a
& CLI_SESS_NOSNOOP
)
2130 log(2, 0, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2131 session
[s
].snoop_ip
= 0;
2132 session
[s
].snoop_port
= 0;
2135 else if (a
& CLI_SESS_SNOOP
)
2137 log(2, 0, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2138 inet_toa(cli_session_actions
[s
].snoop_ip
), cli_session_actions
[s
].snoop_port
);
2140 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2141 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2145 if (a
& CLI_SESS_NOTHROTTLE
)
2147 log(2, 0, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2148 throttle_session(s
, 0, 0);
2151 else if (a
& CLI_SESS_THROTTLE
)
2153 log(2, 0, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2154 cli_session_actions
[s
].throttle_in
,
2155 cli_session_actions
[s
].throttle_out
);
2157 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2162 cluster_send_session(s
);
2164 if (++count
>= MAX_ACTIONS
) break;
2168 if (*config
->accounting_dir
&& next_acct
<= TIME
)
2170 // Dump accounting data
2171 next_acct
= TIME
+ ACCT_TIME
;
2175 if (count
>= MAX_ACTIONS
)
2176 return 1; // Didn't finish!
2178 log(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2184 // Are we in the middle of a tunnel update, or radius
2187 int still_busy(void)
2190 static clockt last_talked
= 0;
2191 static clockt start_busy_wait
= 0;
2192 if (start_busy_wait
== 0)
2193 start_busy_wait
= TIME
;
2195 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2197 if (!tunnel
[i
].controlc
)
2200 if (last_talked
!= TIME
)
2202 log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i
);
2208 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2209 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2211 log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2215 for (i
= 1; i
< MAXRADIUS
; i
++)
2217 if (radius
[i
].state
== RADIUSNULL
)
2219 if (radius
[i
].state
== RADIUSWAIT
)
2222 if (last_talked
!= TIME
)
2224 log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2233 static fd_set readset
;
2234 static int readset_n
= 0;
2236 // main loop - gets packets on tun or udp and processes them
2242 clockt next_cluster_ping
= 0; // send initial ping immediately
2243 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2245 log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2246 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2249 FD_SET(udpfd
, &readset
);
2250 FD_SET(tunfd
, &readset
);
2251 FD_SET(controlfd
, &readset
);
2252 FD_SET(clifd
, &readset
);
2253 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2255 if (tunfd
> readset_n
) readset_n
= tunfd
;
2256 if (controlfd
> readset_n
) readset_n
= controlfd
;
2257 if (clifd
> readset_n
) readset_n
= clifd
;
2258 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2260 while (!main_quit
|| still_busy())
2266 int bgp_set
[BGP_NUM_PEERS
];
2269 if (config
->reload_config
)
2271 // Update the config state based on config settings
2275 memcpy(&r
, &readset
, sizeof(fd_set
));
2277 to
.tv_usec
= 100000; // 1/10th of a second.
2281 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2283 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2286 FD_SET(bgp_peers
[i
].sock
, &r
);
2287 if (bgp_peers
[i
].sock
> n
)
2288 n
= bgp_peers
[i
].sock
;
2293 FD_SET(bgp_peers
[i
].sock
, &w
);
2294 if (bgp_peers
[i
].sock
> n
)
2295 n
= bgp_peers
[i
].sock
;
2299 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2301 n
= select(n
+ 1, &r
, 0, 0, &to
);
2307 if (errno
== EINTR
||
2308 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2311 log(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2317 struct sockaddr_in addr
;
2318 int alen
= sizeof(addr
);
2319 if (FD_ISSET(udpfd
, &r
))
2322 for (c
= 0; c
< config
->multi_read_count
; c
++)
2324 if ((n
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
2325 processudp(buf
, n
, &addr
);
2330 if (FD_ISSET(tunfd
, &r
))
2333 for (c
= 0; c
< config
->multi_read_count
; c
++)
2335 if ((n
= read(tunfd
, buf
, sizeof(buf
))) > 0)
2342 if (config
->cluster_iam_master
)
2343 for (i
= 0; i
< config
->num_radfds
; i
++)
2344 if (FD_ISSET(radfds
[i
], &r
))
2345 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2347 if (FD_ISSET(cluster_sockfd
, &r
))
2350 size
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
);
2351 processcluster(buf
, size
, addr
.sin_addr
.s_addr
);
2354 if (FD_ISSET(controlfd
, &r
))
2355 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
);
2357 if (FD_ISSET(clifd
, &r
))
2359 struct sockaddr_in addr
;
2361 int len
= sizeof(addr
);
2363 if ((sockfd
= accept(clifd
, (struct sockaddr
*)&addr
, &len
)) <= 0)
2365 log(0, 0, 0, 0, "accept error: %s\n", strerror(errno
));
2376 // Runs on every machine (master and slaves).
2377 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
2379 // Check to see which of the cluster is still alive..
2381 cluster_send_ping(basetime
); // Only does anything if we're a slave
2382 cluster_check_master(); // ditto.
2384 cluster_heartbeat(); // Only does anything if we're a master.
2385 cluster_check_slaves(); // ditto.
2387 master_update_counts(); // If we're a slave, send our byte counters to our master.
2389 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
2390 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
2392 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
2395 // Run token bucket filtering queue..
2396 // Only run it every 1/10th of a second.
2397 // Runs on all machines both master and slave.
2399 static clockt last_run
= 0;
2400 if (last_run
!= TIME
)
2407 /* Handle timeouts. Make sure that this gets run anyway, even if there was
2408 * something to read, else under load this will never actually run....
2411 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
2413 if (regular_cleanups())
2416 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
2420 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
2425 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2427 bgp_process(&bgp_peers
[i
],
2428 bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0,
2429 bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0);
2434 // Are we the master and shutting down??
2435 if (config
->cluster_iam_master
)
2436 cluster_heartbeat(); // Flush any queued changes..
2438 // Ok. Notify everyone we're shutting down. If we're
2439 // the master, this will force an election.
2440 cluster_send_ping(0);
2443 // Important!!! We MUST not process any packets past this point!
2446 static void stripdomain(char *host
)
2450 if ((p
= strchr(host
, '.')))
2456 FILE *resolv
= fopen("/etc/resolv.conf", "r");
2462 while (fgets(buf
, sizeof(buf
), resolv
))
2464 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
2467 if (!isspace(buf
[6]))
2471 while (isspace(*b
)) b
++;
2476 while (*b
&& !isspace(*b
)) b
++;
2478 if (buf
[0] == 'd') // domain is canonical
2484 // first search line
2487 // hold, may be subsequent domain line
2488 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
2499 int hl
= strlen(host
);
2500 int dl
= strlen(domain
);
2501 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
2502 host
[hl
-dl
- 1] = 0;
2506 *p
= 0; // everything after first dot
2511 // Init data structures
2512 void initdata(int optdebug
, char *optconfig
)
2516 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
2518 log(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
2521 if (!(config
= shared_malloc(sizeof(struct configt
))))
2523 log(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno
));
2526 memset(config
, 0, sizeof(struct configt
));
2527 time(&config
->start_time
);
2528 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
2529 config
->debug
= optdebug
;
2530 config
->num_tbfs
= MAXTBFS
;
2531 config
->rl_rate
= 28; // 28kbps
2533 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
2535 log(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
2538 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
2540 log(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
2544 if (!(sess_count
= shared_malloc(sizeof(sessioncountt
) * MAXSESSION
)))
2546 log(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno
));
2550 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
2552 log(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
2556 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
2558 log(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
2563 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
2565 log(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
2568 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
2571 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
2573 log(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
2576 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
2578 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
2580 log(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
2583 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
2585 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
2586 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
2587 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
2588 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
2590 // Put all the sessions on the free list marked as undefined.
2591 for (i
= 1; i
< MAXSESSION
- 1; i
++)
2593 session
[i
].next
= i
+ 1;
2594 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
2596 session
[MAXSESSION
- 1].next
= 0;
2599 // Mark all the tunnels as undefined (waiting to be filled in by a download).
2600 for (i
= 1; i
< MAXTUNNEL
- 1; i
++)
2601 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
2605 // Grab my hostname unless it's been specified
2606 gethostname(hostname
, sizeof(hostname
));
2607 stripdomain(hostname
);
2610 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
2613 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
2615 log(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
2621 void initiptables(void)
2623 /* Flush the tables here so that we have a clean slate */
2625 // Not needed. 'nat' is setup by garden.c
2626 // mangle isn't used (as throttling is done by tbf inhouse).
2629 int assign_ip_address(sessionidt s
)
2633 time_t best_time
= time_now
;
2634 char *u
= session
[s
].user
;
2638 CSTAT(call_assign_ip_address
);
2640 for (i
= 1; i
< ip_pool_size
; i
++)
2642 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
2645 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
2652 if (ip_address_pool
[i
].last
< best_time
)
2655 if (!(best_time
= ip_address_pool
[i
].last
))
2656 break; // never used, grab this one
2662 log(0, 0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
2666 session
[s
].ip
= ip_address_pool
[best
].address
;
2667 session
[s
].ip_pool_index
= best
;
2668 ip_address_pool
[best
].assigned
= 1;
2669 ip_address_pool
[best
].last
= time_now
;
2670 ip_address_pool
[best
].session
= s
;
2671 if (session
[s
].walled_garden
)
2672 /* Don't track addresses of users in walled garden (note: this
2673 means that their address isn't "sticky" even if they get
2675 ip_address_pool
[best
].user
[0] = 0;
2677 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
2680 log(4, ip_address_pool
[best
].address
, s
, session
[s
].tunnel
,
2681 "assign_ip_address(): %s ip address %d from pool\n", reuse
? "Reusing" : "Allocating", best
);
2686 void free_ip_address(sessionidt s
)
2688 int i
= session
[s
].ip_pool_index
;
2691 return; // what the?
2693 if (i
< 0) // Is this actually part of the ip pool?
2697 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
2699 ip_address_pool
[i
].assigned
= 0;
2700 ip_address_pool
[i
].session
= 0;
2701 ip_address_pool
[i
].last
= time_now
;
2704 CSTAT(call_free_ip_address
);
2709 // Fsck the address pool against the session table.
2710 // Normally only called when we become a master.
2712 // This isn't perfect: We aren't keep tracking of which
2713 // users used to have an IP address.
2715 void rebuild_address_pool(void)
2720 // Zero the IP pool allocation, and build
2721 // a map from IP address to pool index.
2722 for (i
= 1; i
< MAXIPPOOL
; ++i
)
2724 ip_address_pool
[i
].assigned
= 0;
2725 ip_address_pool
[i
].session
= 0;
2726 if (!ip_address_pool
[i
].address
)
2729 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
2732 for (i
= 0; i
< MAXSESSION
; ++i
)
2735 if (!session
[i
].ip
|| !session
[i
].tunnel
)
2737 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
2739 if (session
[i
].ip_pool_index
< 0)
2741 // Not allocated out of the pool.
2742 if (ipid
< 1) // Not found in the pool either? good.
2745 log(0, 0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
2746 i
, inet_toa(session
[i
].ip
), ipid
);
2748 // Fall through and process it as part of the pool.
2752 if (ipid
> MAXIPPOOL
|| ipid
< 0)
2754 log(0, 0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
2756 session
[i
].ip_pool_index
= ipid
;
2760 ip_address_pool
[ipid
].assigned
= 1;
2761 ip_address_pool
[ipid
].session
= i
;
2762 ip_address_pool
[ipid
].last
= time_now
;
2763 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
2764 session
[i
].ip_pool_index
= ipid
;
2765 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
2770 // Fix the address pool to match a changed session.
2771 // (usually when the master sends us an update).
2772 void fix_address_pool(int sid
)
2776 ipid
= session
[sid
].ip_pool_index
;
2778 if (ipid
> ip_pool_size
)
2779 return; // Ignore it. rebuild_address_pool will fix it up.
2781 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
2782 return; // Just ignore it. rebuild_address_pool will take care of it.
2784 ip_address_pool
[ipid
].assigned
= 1;
2785 ip_address_pool
[ipid
].session
= sid
;
2786 ip_address_pool
[ipid
].last
= time_now
;
2787 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
2791 // Add a block of addresses to the IP pool to hand out.
2793 void add_to_ip_pool(u32 addr
, u32 mask
)
2797 mask
= 0xffffffff; // Host route only.
2801 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
2804 for (i
= addr
;(i
& mask
) == addr
; ++i
)
2806 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
2807 continue; // Skip 0 and broadcast addresses.
2809 ip_address_pool
[ip_pool_size
].address
= i
;
2810 ip_address_pool
[ip_pool_size
].assigned
= 0;
2812 if (ip_pool_size
>= MAXIPPOOL
)
2814 log(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr
)) );
2820 // Initialize the IP address pool
2826 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
2828 if (!(f
= fopen(IPPOOLFILE
, "r")))
2830 log(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
2834 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
2837 buf
[4095] = 0; // Force it to be zero terminated/
2839 if (*buf
== '#' || *buf
== '\n')
2840 continue; // Skip comments / blank lines
2841 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
2842 if ((p
= (char *)strchr(buf
, ':')))
2846 src
= inet_addr(buf
);
2847 if (src
== INADDR_NONE
)
2849 log(0, 0, 0, 0, "Invalid address pool IP %s\n", buf
);
2852 // This entry is for a specific IP only
2853 if (src
!= config
->bind_address
)
2858 if ((p
= (char *)strchr(pool
, '/')))
2862 u32 start
= 0, mask
= 0;
2864 log(2, 0, 0, 0, "Adding IP address range %s\n", buf
);
2866 if (!*p
|| !(numbits
= atoi(p
)))
2868 log(0, 0, 0, 0, "Invalid pool range %s\n", buf
);
2871 start
= ntohl(inet_addr(pool
));
2872 mask
= (u32
)(pow(2, numbits
) - 1) << (32 - numbits
);
2874 // Add a static route for this pool
2875 log(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start
)), 32 + mask
);
2876 routeset(0, start
, mask
, 0, 1);
2878 add_to_ip_pool(start
, mask
);
2882 // It's a single ip address
2883 add_to_ip_pool(inet_addr(pool
), 0);
2887 log(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
2890 void snoop_send_packet(char *packet
, u16 size
, ipt destination
, u16 port
)
2892 struct sockaddr_in snoop_addr
= {0};
2893 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
2896 snoop_addr
.sin_family
= AF_INET
;
2897 snoop_addr
.sin_addr
.s_addr
= destination
;
2898 snoop_addr
.sin_port
= ntohs(port
);
2900 log(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n",
2901 packet
, size
, inet_toa(snoop_addr
.sin_addr
.s_addr
), htons(snoop_addr
.sin_port
));
2902 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
2903 log(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
2904 STAT(packets_snooped
);
2907 void dump_acct_info()
2909 char filename
[1024];
2911 time_t t
= time(NULL
);
2916 CSTAT(call_dump_acct_info
);
2918 strftime(timestr
, 64, "%Y%m%d%H%M%S", localtime(&t
));
2919 snprintf(filename
, 1024, "%s/%s", config
->accounting_dir
, timestr
);
2921 for (i
= 0; i
< MAXSESSION
; i
++)
2923 if (!session
[i
].opened
|| !session
[i
].ip
|| !(session
[i
].cin
|| session
[i
].cout
) || !*session
[i
].user
|| session
[i
].walled_garden
)
2927 time_t now
= time(NULL
);
2928 if (!(f
= fopen(filename
, "w")))
2930 log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
2933 log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename
);
2934 fprintf(f
, "# dslwatch.pl dump file V1.01\n"
2938 "# format: username ip qos uptxoctets downrxoctets\n",
2944 log(4, 0, 0, 0, "Dumping accounting information for %s\n", session
[i
].user
);
2945 fprintf(f
, "%s %s %d %u %u\n",
2946 session
[i
].user
, // username
2947 inet_toa(htonl(session
[i
].ip
)), // ip
2948 (session
[i
].throttle_in
|| session
[i
].throttle_out
) ? 2 : 1, // qos
2949 (u32
)session
[i
].cin
, // uptxoctets
2950 (u32
)session
[i
].cout
); // downrxoctets
2952 session
[i
].pin
= session
[i
].cin
= 0;
2953 session
[i
].pout
= session
[i
].cout
= 0;
2961 int main(int argc
, char *argv
[])
2965 char *optconfig
= CONFIGFILE
;
2967 _program_name
= strdup(argv
[0]);
2969 time(&basetime
); // start clock
2972 while ((o
= getopt(argc
, argv
, "dvc:h:")) >= 0)
2977 // Double fork to detach from terminal
2978 if (fork()) exit(0);
2979 if (fork()) exit(0);
2988 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
2991 printf("Args are:\n"
2992 "\t-d\tDetach from terminal\n"
2993 "\t-c <file>\tConfig file\n"
2994 "\t-h <hostname>\tForce hostname\n"
2995 "\t-a <address>\tUse specific address\n"
3003 // Start the timer routine off
3005 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3006 signal(SIGALRM
, sigalrm_handler
);
3007 siginterrupt(SIGALRM
, 0);
3011 initdata(optdebug
, optconfig
);
3015 init_tbf(config
->num_tbfs
);
3017 log(0, 0, 0, 0, "L2TPNS version " VERSION
"\n");
3018 log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
3019 log(0, 0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3022 rlim
.rlim_cur
= RLIM_INFINITY
;
3023 rlim
.rlim_max
= RLIM_INFINITY
;
3024 // Remove the maximum core size
3025 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3026 log(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3027 // Make core dumps go to /tmp
3031 if (config
->scheduler_fifo
)
3034 struct sched_param params
= {0};
3035 params
.sched_priority
= 1;
3037 if (get_nprocs() < 2)
3039 log(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3040 config
->scheduler_fifo
= 0;
3044 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3046 log(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3050 log(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3051 config
->scheduler_fifo
= 0;
3056 /* Set up the cluster communications port. */
3057 if (cluster_init(config
->bind_address
) < 0)
3061 signal(SIGPIPE
, SIG_IGN
);
3062 bgp_setup(config
->as_number
);
3063 bgp_add_route(config
->bind_address
, 0xffffffff);
3064 if (*config
->bgp_peer
[0])
3065 bgp_start(&bgp_peers
[0], config
->bgp_peer
[0],
3066 config
->bgp_peer_as
[0], 0); /* 0 = routing disabled */
3068 if (*config
->bgp_peer
[1])
3069 bgp_start(&bgp_peers
[1], config
->bgp_peer
[1],
3070 config
->bgp_peer_as
[1], 0);
3074 log(1, 0, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3082 signal(SIGHUP
, sighup_handler
);
3083 signal(SIGTERM
, sigterm_handler
);
3084 signal(SIGINT
, sigterm_handler
);
3085 signal(SIGQUIT
, sigquit_handler
);
3086 signal(SIGCHLD
, sigchild_handler
);
3088 // Prevent us from getting paged out
3089 if (config
->lock_pages
)
3091 if (!mlockall(MCL_CURRENT
))
3092 log(1, 0, 0, 0, "Locking pages into memory\n");
3094 log(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3099 // Drop privileges here
3100 if (config
->target_uid
> 0 && geteuid() == 0)
3101 setuid(config
->target_uid
);
3106 /* try to shut BGP down cleanly; with luck the sockets will be
3107 writable since we're out of the select */
3110 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3111 if (bgp_peers
[i
].state
== Established
)
3112 bgp_stop(&bgp_peers
[i
]);
3116 /* remove plugins (so cleanup code gets run) */
3119 // Remove the PID file if we wrote it
3120 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3121 unlink(config
->pid_file
);
3123 /* kill CLI children */
3124 signal(SIGTERM
, SIG_IGN
);
3129 void sighup_handler(int junk
)
3131 if (log_stream
&& log_stream
!= stderr
)
3140 void sigalrm_handler(int junk
)
3142 // Log current traffic stats
3144 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3145 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3146 (udp_rx
/ 1024.0 / 1024.0 * 8),
3147 (eth_tx
/ 1024.0 / 1024.0 * 8),
3148 (eth_rx
/ 1024.0 / 1024.0 * 8),
3149 (udp_tx
/ 1024.0 / 1024.0 * 8),
3150 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3151 udp_rx_pkt
, eth_rx_pkt
);
3153 udp_tx
= udp_rx
= 0;
3154 udp_rx_pkt
= eth_rx_pkt
= 0;
3155 eth_tx
= eth_rx
= 0;
3157 if (config
->dump_speed
)
3158 printf("%s\n", config
->bandwidth
);
3160 // Update the internal time counter
3162 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3167 struct param_timer p
= { time_now
};
3168 run_plugins(PLUGIN_TIMER
, &p
);
3173 void sigterm_handler(int junk
)
3175 log(1, 0, 0, 0, "Shutting down cleanly\n");
3176 if (config
->save_state
)
3182 void sigquit_handler(int junk
)
3186 log(1, 0, 0, 0, "Shutting down without saving sessions\n");
3187 for (i
= 1; i
< MAXSESSION
; i
++)
3189 if (session
[i
].opened
)
3190 sessionkill(i
, "L2TPNS Closing");
3192 for (i
= 1; i
< MAXTUNNEL
; i
++)
3194 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3195 tunnelshutdown(i
, "L2TPNS Closing");
3201 void sigchild_handler(int signal
)
3203 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3213 char magic
[sizeof(DUMP_MAGIC
) - 1];
3216 if (!config
->save_state
)
3222 if (stat(STATEFILE
, &sb
) < 0)
3228 if (sb
.st_mtime
< (time(NULL
) - 60))
3230 log(0, 0, 0, 0, "State file is too old to read, ignoring\n");
3235 f
= fopen(STATEFILE
, "r");
3240 log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno
));
3244 if (fread(magic
, sizeof(magic
), 1, f
) != 1 || strncmp(magic
, DUMP_MAGIC
, sizeof(magic
)))
3246 log(0, 0, 0, 0, "Bad state file magic\n");
3250 log(1, 0, 0, 0, "Reading state information\n");
3251 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] > MAXIPPOOL
|| buf
[1] != sizeof(ippoolt
))
3253 log(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
3257 if (buf
[0] > ip_pool_size
)
3259 log(0, 0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf
[0], ip_pool_size
);
3263 log(2, 0, 0, 0, "Loading %u ip addresses\n", buf
[0]);
3264 for (i
= 0; i
< buf
[0]; i
++)
3266 if (fread(&itmp
, sizeof(itmp
), 1, f
) != 1)
3268 log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i
, strerror(errno
));
3272 if (itmp
.address
!= ip_address_pool
[i
].address
)
3274 log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i
);
3278 memcpy(&ip_address_pool
[i
], &itmp
, sizeof(itmp
));
3281 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXTUNNEL
|| buf
[1] != sizeof(tunnelt
))
3283 log(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
3287 log(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL
);
3288 if (fread(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3290 log(0, 0, 0, 0, "Error reading tunnel data from state file\n");
3294 for (i
= 0; i
< MAXTUNNEL
; i
++)
3296 tunnel
[i
].controlc
= 0;
3297 tunnel
[i
].controls
= NULL
;
3298 tunnel
[i
].controle
= NULL
;
3299 if (*tunnel
[i
].hostname
)
3300 log(3, 0, 0, 0, "Created tunnel for %s\n", tunnel
[i
].hostname
);
3303 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXSESSION
|| buf
[1] != sizeof(sessiont
))
3305 log(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
3309 log(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION
);
3310 if (fread(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3312 log(0, 0, 0, 0, "Error reading session data from state file\n");
3316 for (i
= 0; i
< MAXSESSION
; i
++)
3318 session
[i
].tbf_in
= 0;
3319 session
[i
].tbf_out
= 0;
3320 if (session
[i
].opened
)
3322 log(2, 0, i
, 0, "Loaded active session for user %s\n", session
[i
].user
);
3324 sessionsetup(session
[i
].tunnel
, i
);
3329 log(0, 0, 0, 0, "Loaded saved state information\n");
3337 if (!config
->save_state
)
3342 if (!(f
= fopen(STATEFILE
, "w")))
3345 log(1, 0, 0, 0, "Dumping state information\n");
3347 if (fwrite(DUMP_MAGIC
, sizeof(DUMP_MAGIC
) - 1, 1, f
) != 1)
3350 log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size
);
3351 buf
[0] = ip_pool_size
;
3352 buf
[1] = sizeof(ippoolt
);
3353 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3355 if (fwrite(ip_address_pool
, sizeof(ippoolt
), ip_pool_size
, f
) != ip_pool_size
)
3358 log(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL
);
3360 buf
[1] = sizeof(tunnelt
);
3361 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3363 if (fwrite(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3366 log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION
);
3367 buf
[0] = MAXSESSION
;
3368 buf
[1] = sizeof(sessiont
);
3369 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3371 if (fwrite(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3379 log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno
));
3383 void build_chap_response(char *challenge
, u8 id
, u16 challenge_length
, char **challenge_response
)
3386 *challenge_response
= NULL
;
3388 if (!*config
->l2tpsecret
)
3390 log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3394 log(4, 0, 0, 0, " Building challenge response for CHAP request\n");
3396 *challenge_response
= (char *)calloc(17, 1);
3399 MD5Update(&ctx
, &id
, 1);
3400 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3401 MD5Update(&ctx
, challenge
, challenge_length
);
3402 MD5Final(*challenge_response
, &ctx
);
3407 static int facility_value(char *name
)
3410 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3412 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3413 return facilitynames
[i
].c_val
;
3418 void update_config()
3421 static int timeout
= 0;
3422 static int interval
= 0;
3432 if (*config
->log_filename
)
3434 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3436 char *p
= config
->log_filename
+ 7;
3439 openlog("l2tpns", LOG_PID
, facility_value(p
));
3443 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
3445 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
3447 fseek(log_stream
, 0, SEEK_END
);
3448 setbuf(log_stream
, NULL
);
3452 log_stream
= stderr
;
3453 setbuf(log_stream
, NULL
);
3459 log_stream
= stderr
;
3460 setbuf(log_stream
, NULL
);
3465 config
->numradiusservers
= 0;
3466 for (i
= 0; i
< MAXRADSERVER
; i
++)
3467 if (config
->radiusserver
[i
])
3469 config
->numradiusservers
++;
3470 // Set radius port: if not set, take the port from the
3471 // first radius server. For the first radius server,
3472 // take the #defined default value from l2tpns.h
3474 // test twice, In case someone works with
3475 // a secondary radius server without defining
3476 // a primary one, this will work even then.
3477 if (i
>0 && !config
->radiusport
[i
])
3478 config
->radiusport
[i
] = config
->radiusport
[i
-1];
3479 if (!config
->radiusport
[i
])
3480 config
->radiusport
[i
] = RADPORT
;
3483 if (!config
->numradiusservers
)
3485 log(0, 0, 0, 0, "No RADIUS servers defined!\n");
3488 config
->num_radfds
= 2 << RADIUS_SHIFT
;
3491 for (i
= 0; i
< MAXPLUGINS
; i
++)
3493 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
3495 if (*config
->plugins
[i
])
3498 add_plugin(config
->plugins
[i
]);
3500 else if (*config
->old_plugins
[i
])
3503 remove_plugin(config
->old_plugins
[i
]);
3506 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
3507 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
3508 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
3509 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
3510 if (!*config
->cluster_interface
)
3511 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
3513 if (!config
->cluster_hb_interval
)
3514 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
3516 if (!config
->cluster_hb_timeout
)
3517 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
3519 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
3521 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
3522 // late, ensure we're sufficiently larger than that
3523 int t
= 4 * config
->cluster_hb_interval
+ 11;
3525 if (config
->cluster_hb_timeout
< t
)
3527 log(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
3528 config
->cluster_hb_timeout
= t
;
3531 // Push timing changes to the slaves immediately if we're the master
3532 if (config
->cluster_iam_master
)
3533 cluster_heartbeat();
3535 interval
= config
->cluster_hb_interval
;
3536 timeout
= config
->cluster_hb_timeout
;
3540 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
3543 if ((f
= fopen(config
->pid_file
, "w")))
3545 fprintf(f
, "%d\n", getpid());
3547 config
->wrote_pid
= 1;
3551 log(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
3555 config
->reload_config
= 0;
3558 void read_config_file()
3562 if (!config
->config_file
) return;
3563 if (!(f
= fopen(config
->config_file
, "r")))
3565 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
3569 log(3, 0, 0, 0, "Reading config file %s\n", config
->config_file
);
3571 log(3, 0, 0, 0, "Done reading config file\n");
3576 int sessionsetup(tunnelidt t
, sessionidt s
)
3578 // A session now exists, set it up
3584 CSTAT(call_sessionsetup
);
3586 log(3, session
[s
].ip
, s
, t
, "Doing session setup for session\n");
3588 if (!session
[s
].ip
|| session
[s
].ip
== 0xFFFFFFFE)
3590 assign_ip_address(s
);
3592 log(3, 0, s
, t
, " No IP allocated. Assigned %s from pool\n",
3593 inet_toa(htonl(session
[s
].ip
)));
3596 log(0, 0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
3597 sessionshutdown(s
, "No IP addresses available");
3603 // Make sure this is right
3604 session
[s
].tunnel
= t
;
3606 // zap old sessions with same IP and/or username
3607 // Don't kill gardened sessions - doing so leads to a DoS
3608 // from someone who doesn't need to know the password
3611 user
= session
[s
].user
;
3612 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3614 if (i
== s
) continue;
3615 if (ip
== session
[i
].ip
) sessionkill(i
, "Duplicate IP address");
3616 if (!session
[s
].walled_garden
&& !session
[i
].walled_garden
&& strcasecmp(user
, session
[i
].user
) == 0)
3617 sessionkill(i
, "Duplicate session for users");
3621 // Add the route for this session.
3623 // Static IPs need to be routed. Anything else
3624 // is part of the IP address pool and is already routed,
3625 // it just needs to be added to the IP cache.
3626 if (session
[s
].ip_pool_index
== -1) // static ip
3627 routeset(s
, session
[s
].ip
, 0, 0, 1);
3629 cache_ipmap(session
[s
].ip
, s
);
3631 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
3632 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, session
[s
].ip
, 1);
3634 if (!session
[s
].unique_id
)
3636 // did this session just finish radius?
3637 log(3, session
[s
].ip
, s
, t
, "Sending initial IPCP to client\n");
3639 session
[s
].unique_id
= ++last_id
;
3642 // Run the plugin's against this new session.
3644 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
3645 run_plugins(PLUGIN_NEW_SESSION
, &data
);
3648 // Allocate TBFs if throttled
3649 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
3650 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
3652 session
[s
].last_packet
= time_now
;
3655 char *sessionip
, *tunnelip
;
3656 sessionip
= strdup(inet_toa(htonl(session
[s
].ip
)));
3657 tunnelip
= strdup(inet_toa(htonl(tunnel
[t
].ip
)));
3658 log(2, session
[s
].ip
, s
, t
, "Login by %s at %s from %s (%s)\n",
3659 session
[s
].user
, sessionip
, tunnelip
, tunnel
[t
].hostname
);
3660 if (sessionip
) free(sessionip
);
3661 if (tunnelip
) free(tunnelip
);
3664 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
3666 return 1; // RADIUS OK and IP allocated, done...
3670 // This session just got dropped on us by the master or something.
3671 // Make sure our tables up up to date...
3673 int load_session(sessionidt s
, sessiont
*new)
3678 if (new->ip_pool_index
>= MAXIPPOOL
||
3679 new->tunnel
>= MAXTUNNEL
)
3681 log(0,0,s
,0, "Strange session update received!\n");
3682 // FIXME! What to do here?
3687 // Ok. All sanity checks passed. Now we're committed to
3688 // loading the new session.
3691 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
3694 if (new->ip
!= session
[s
].ip
) // Changed ip. fix up hash tables.
3696 if (session
[s
].ip
) // If there's an old one, remove it.
3698 // Remove any routes if the IP has changed
3699 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
3701 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, session
[s
].ip
, 0);
3702 session
[s
].route
[i
].ip
= 0;
3705 if (session
[s
].ip_pool_index
== -1) // static IP
3706 routeset(s
, session
[s
].ip
, 0, 0, 0);
3707 else // It's part of the IP pool, remove it manually.
3708 uncache_ipmap(session
[s
].ip
);
3713 // If there's a new one, add it.
3714 if (new->ip_pool_index
== -1)
3715 routeset(s
, new->ip
, 0, 0, 1);
3717 cache_ipmap(new->ip
, s
);
3721 // Update routed networks
3722 for (i
= 0; i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
3724 if (new->route
[i
].ip
== session
[s
].route
[i
].ip
&&
3725 new->route
[i
].mask
== session
[s
].route
[i
].mask
)
3728 if (session
[s
].route
[i
].ip
) // Remove the old one if it exists.
3729 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, session
[s
].ip
, 0);
3731 if (new->route
[i
].ip
) // Add the new one if it exists.
3732 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, new->ip
, 1);
3735 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
3736 // for walking the sessions to forward byte counts to the master.
3737 config
->cluster_highest_sessionid
= s
;
3739 // TEMP: old session struct used a u32 to define the throttle
3740 // speed for both up/down, new uses a u16 for each. Deal with
3741 // sessions from an old master for migration.
3742 if (new->throttle_out
== 0 && new->tbf_out
)
3743 new->throttle_out
= new->throttle_in
;
3745 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
3747 // Do fixups into address pool.
3748 if (new->ip_pool_index
!= -1)
3749 fix_address_pool(s
);
3755 void ringbuffer_dump(FILE *stream
)
3757 int i
= ringbuffer
->head
;
3759 while (i
!= ringbuffer
->tail
)
3761 if (*ringbuffer
->buffer
[i
].message
)
3762 fprintf(stream
, "%d-%s", ringbuffer
->buffer
[i
].level
, ringbuffer
->buffer
[i
].message
);
3763 if (++i
== ringbuffer
->tail
) break;
3764 if (i
== RINGBUFFER_SIZE
) i
= 0;
3773 loaded_plugins
= ll_init();
3774 // Initialize the plugins to nothing
3775 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
3776 plugins
[i
] = ll_init();
3779 static void *open_plugin(char *plugin_name
, int load
)
3781 char path
[256] = "";
3783 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
3784 log(2, 0, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
3785 return dlopen(path
, RTLD_NOW
);
3788 void add_plugin(char *plugin_name
)
3790 static struct pluginfuncs funcs
= {
3795 sessiontbysessionidt
,
3796 sessionidtbysessiont
,
3802 void *p
= open_plugin(plugin_name
, 1);
3803 int (*initfunc
)(struct pluginfuncs
*);
3808 log(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror());
3812 if (ll_contains(loaded_plugins
, p
))
3819 int *v
= dlsym(p
, "__plugin_api_version");
3820 if (!v
|| *v
!= PLUGIN_API_VERSION
)
3822 log(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
3828 if ((initfunc
= dlsym(p
, "plugin_init")))
3830 if (!initfunc(&funcs
))
3832 log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
3838 ll_push(loaded_plugins
, p
);
3840 for (i
= 0; i
< max_plugin_functions
; i
++)
3843 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
3845 log(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
3846 ll_push(plugins
[i
], x
);
3850 log(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name
);
3853 static void run_plugin_done(void *plugin
)
3855 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
3861 void remove_plugin(char *plugin_name
)
3863 void *p
= open_plugin(plugin_name
, 0);
3869 for (i
= 0; i
< max_plugin_functions
; i
++)
3872 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
3873 ll_delete(plugins
[i
], x
);
3876 if (ll_contains(loaded_plugins
, p
))
3878 ll_delete(loaded_plugins
, p
);
3883 log(2, 0, 0, 0, "Removed plugin %s\n", plugin_name
);
3886 int run_plugins(int plugin_type
, void *data
)
3888 int (*func
)(void *data
);
3889 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
) return 1;
3891 ll_reset(plugins
[plugin_type
]);
3892 while ((func
= ll_next(plugins
[plugin_type
])))
3896 if (rc
== PLUGIN_RET_STOP
) return 1;
3897 if (rc
== PLUGIN_RET_ERROR
) return 0;
3906 ll_reset(loaded_plugins
);
3907 while ((p
= ll_next(loaded_plugins
)))
3911 void processcontrol(u8
* buf
, int len
, struct sockaddr_in
*addr
)
3915 struct param_control param
= { buf
, len
, ntohl(addr
->sin_addr
.s_addr
), ntohs(addr
->sin_port
), NULL
, 0, 0 };
3918 if (log_stream
&& config
->debug
>= 4)
3920 log(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Received ");
3921 dump_packet(buf
, log_stream
);
3924 resp
= calloc(1400, 1);
3925 l
= new_packet(PKT_RESP_ERROR
, resp
);
3926 *(int *)(resp
+ 6) = *(int *)(buf
+ 6);
3928 param
.type
= ntohs(*(short *)(buf
+ 2));
3929 param
.id
= ntohl(*(int *)(buf
+ 6));
3930 param
.data_length
= ntohs(*(short *)(buf
+ 4)) - 10;
3931 param
.data
= (param
.data_length
> 0) ? (char *)(buf
+ 10) : NULL
;
3932 param
.response
= resp
;
3933 param
.response_length
= l
;
3935 run_plugins(PLUGIN_CONTROL
, ¶m
);
3937 if (param
.send_response
)
3939 send_packet(controlfd
, ntohl(addr
->sin_addr
.s_addr
), ntohs(addr
->sin_port
), param
.response
, param
.response_length
);
3940 log(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Sent Control packet response\n");
3948 * Go through all of the tunnels and do some cleanups
3954 log(1, 0, 0, 0, "Cleaning tunnels array\n");
3956 for (i
= 1; i
< MAXTUNNEL
; i
++)
3959 || !*tunnel
[i
].hostname
3960 || (tunnel
[i
].state
== TUNNELDIE
&& tunnel
[i
].die
>= time_now
))
3967 void tunnelclear(tunnelidt t
)
3970 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
3971 tunnel
[t
].state
= TUNNELFREE
;
3974 tunnelidt
new_tunnel()
3977 for (i
= 1; i
< MAXTUNNEL
; i
++)
3979 if (tunnel
[i
].state
== TUNNELFREE
)
3981 log(4, 0, 0, i
, "Assigning tunnel ID %d\n", i
);
3982 if (i
> config
->cluster_highest_tunnelid
)
3983 config
->cluster_highest_tunnelid
= i
;
3987 log(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
3992 // We're becoming the master. Do any required setup..
3994 // This is principally telling all the plugins that we're
3995 // now a master, and telling them about all the sessions
3996 // that are active too..
3998 void become_master(void)
4001 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4003 // running a bunch of iptables commands is slow and can cause
4004 // the master to drop tunnels on takeover--kludge around the
4005 // problem by forking for the moment (note: race)
4006 if (!fork_and_close())
4008 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4010 if (!session
[s
].tunnel
) // Not an in-use session.
4013 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4019 for (i
= 0; i
< config
->num_radfds
; i
++)
4021 if (!radfds
[i
]) continue;
4022 FD_SET(radfds
[i
], &readset
);
4023 if (radfds
[i
] > readset_n
)
4024 readset_n
= radfds
[i
];
4028 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4034 if (CLI_HELP_REQUESTED
)
4035 return CLI_HELP_NO_ARGS
;
4038 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4040 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4043 if (!session
[s
].tunnel
)
4046 idle
= time_now
- session
[s
].last_packet
;
4047 idle
/= 5 ; // In multiples of 5 seconds.
4057 for (i
= 0; i
< 63; ++i
)
4059 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4061 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4062 cli_print(cli
, "%d total sessions open.", count
);
4066 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4072 if (CLI_HELP_REQUESTED
)
4073 return CLI_HELP_NO_ARGS
;
4076 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4078 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4081 if (!session
[s
].tunnel
)
4084 d
= time_now
- session
[s
].opened
;
4087 while (d
> 1 && open
< 32)
4097 for (i
= 0; i
< 30; ++i
)
4099 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4102 cli_print(cli
, "%d total sessions open.", count
);
4108 * This unencodes the AVP using the L2TP CHAP secret and the
4109 * previously stored random vector. It replaces the hidden data with
4110 * the cleartext data and returns the length of the cleartext data
4111 * (including the AVP "header" of 6 bytes).
4113 * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
4115 int unhide_avp(u8
*avp
, tunnelidt t
, sessionidt s
, u16 length
)
4120 u8 working_vector
[16];
4121 uint16_t hidden_length
;
4126 // Find the AVP type.
4127 type
[0] = *(avp
+ 4);
4128 type
[1] = *(avp
+ 5);
4130 // Line up with the hidden data
4131 cursor
= output
= avp
+ 6;
4133 // Compute initial pad
4135 MD5Update(&ctx
, type
, 2);
4136 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4137 MD5Update(&ctx
, session
[s
].random_vector
, session
[s
].random_vector_length
);
4138 MD5Final(digest
, &ctx
);
4140 // Get hidden length
4141 hidden_length
= ((uint16_t) (digest
[0] ^ cursor
[0])) * 256 + (uint16_t) (digest
[1] ^ cursor
[1]);
4143 // Keep these for later use
4144 working_vector
[0] = *cursor
;
4145 working_vector
[1] = *(cursor
+ 1);
4148 if (hidden_length
> length
- 8)
4150 log(1, 0, s
, t
, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length
, (int) length
);
4154 /* Decrypt remainder */
4156 todo
= hidden_length
;
4159 working_vector
[done
] = *cursor
;
4160 *output
= digest
[done
] ^ *cursor
;
4165 if (done
== 16 && todo
)
4167 // Compute new digest
4170 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4171 MD5Update(&ctx
, &working_vector
, 16);
4172 MD5Final(digest
, &ctx
);
4176 return hidden_length
+ 6;