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 1.48 2004/11/11 03:07:42 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"
57 struct configt
*config
= NULL
; // all configuration
58 int tunfd
= -1; // tun interface file handle. (network device)
59 int udpfd
= -1; // UDP file handle
60 int controlfd
= -1; // Control signal handle
61 int snoopfd
= -1; // UDP file handle for sending out intercept data
62 int *radfds
= NULL
; // RADIUS requests file handles
63 int ifrfd
= -1; // File descriptor for routing, etc
64 time_t basetime
= 0; // base clock
65 char hostname
[1000] = ""; // us.
66 int tunidx
; // ifr_ifindex of tun device
67 u32 sessionid
= 0; // session id for radius accounting
68 int syslog_log
= 0; // are we logging to syslog
69 FILE *log_stream
= NULL
; // file handle for direct logging (i.e. direct into file, not via syslog).
70 extern int cluster_sockfd
; // Intra-cluster communications socket.
71 u32 last_id
= 0; // Last used PPP SID. Can I kill this?? -- mo
72 int clifd
= 0; // Socket listening for CLI connections.
74 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
75 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
77 static void *ip_hash
[256]; // Mapping from IP address to session structures.
79 u32 udp_tx
= 0, udp_rx
= 0, udp_rx_pkt
= 0; // Global traffic counters.
80 u32 eth_tx
= 0, eth_rx
= 0, eth_rx_pkt
= 0;
81 u32 ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
82 time_t time_now
= 0; // Current time in seconds since epoch.
83 char time_now_string
[64] = {0}; // Current time as a string.
84 char main_quit
= 0; // True if we're in the process of exiting.
85 char *_program_name
= NULL
;
86 linked_list
*loaded_plugins
;
87 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
89 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
90 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(struct configt, MEMBER), membersize(struct configt, MEMBER), TYPE }
92 struct config_descriptt config_values
[] = {
93 CONFIG("debug", debug
, INT
),
94 CONFIG("log_file", log_filename
, STRING
),
95 CONFIG("pid_file", pid_file
, STRING
),
96 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
97 CONFIG("primary_dns", default_dns1
, IP
),
98 CONFIG("secondary_dns", default_dns2
, IP
),
99 CONFIG("save_state", save_state
, BOOL
),
100 CONFIG("primary_radius", radiusserver
[0], IP
),
101 CONFIG("secondary_radius", radiusserver
[1], IP
),
102 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
103 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
104 CONFIG("radius_accounting", radius_accounting
, BOOL
),
105 CONFIG("radius_secret", radiussecret
, STRING
),
106 CONFIG("bind_address", bind_address
, IP
),
107 CONFIG("peer_address", peer_address
, IP
),
108 CONFIG("send_garp", send_garp
, BOOL
),
109 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
110 CONFIG("throttle_buckets", num_tbfs
, INT
),
111 CONFIG("accounting_dir", accounting_dir
, STRING
),
112 CONFIG("setuid", target_uid
, INT
),
113 CONFIG("dump_speed", dump_speed
, BOOL
),
114 CONFIG("cleanup_interval", cleanup_interval
, INT
),
115 CONFIG("multi_read_count", multi_read_count
, INT
),
116 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
117 CONFIG("lock_pages", lock_pages
, BOOL
),
118 CONFIG("icmp_rate", icmp_rate
, INT
),
119 CONFIG("cluster_address", cluster_address
, IP
),
120 CONFIG("cluster_interface", cluster_interface
, STRING
),
121 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
122 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
126 char *plugin_functions
[] = {
133 "plugin_new_session",
134 "plugin_kill_session",
136 "plugin_radius_response",
137 "plugin_become_master",
138 "plugin_new_session_master",
141 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
143 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
144 sessiont
*session
= NULL
; // Array of session structures.
145 sessioncountt
*sess_count
= NULL
; // Array of partial per-session traffic counters.
146 radiust
*radius
= NULL
; // Array of radius structures.
147 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
148 controlt
*controlfree
= 0;
149 struct Tstats
*_statistics
= NULL
;
151 struct Tringbuffer
*ringbuffer
= NULL
;
154 void sigalrm_handler(int);
155 void sighup_handler(int);
156 void sigterm_handler(int);
157 void sigquit_handler(int);
158 void sigchild_handler(int);
159 void read_config_file();
163 tunnelidt
new_tunnel();
164 void update_config();
165 int unhide_avp(u8
*avp
, tunnelidt t
, sessionidt s
, u16 length
);
167 static void cache_ipmap(ipt ip
, int s
);
168 static void uncache_ipmap(ipt ip
);
170 // return internal time (10ths since process startup)
175 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
178 // work out a retry time based on try number
179 // This is a straight bounded exponential backoff.
180 // Maximum re-try time is 32 seconds. (2^5).
181 clockt
backoff(u8
try)
183 if (try > 5) try = 5; // max backoff
184 return now() + 10 * (1 << try);
189 // Log a debug message. Typically called vias LOG macro
191 void _log(int level
, ipt address
, sessionidt s
, tunnelidt t
, const char *format
, ...)
193 static char message
[65536] = {0};
194 static char message2
[65536] = {0};
200 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
201 ringbuffer
->tail
= 0;
202 if (ringbuffer
->tail
== ringbuffer
->head
)
203 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
204 ringbuffer
->head
= 0;
206 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
207 ringbuffer
->buffer
[ringbuffer
->tail
].address
= address
;
208 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
209 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
210 va_start(ap
, format
);
211 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
216 if (config
->debug
< level
) return;
218 va_start(ap
, format
);
221 vsnprintf(message2
, 65535, format
, ap
);
222 snprintf(message
, 65535, "%s %02d/%02d %s", time_now_string
, t
, s
, message2
);
223 fprintf(log_stream
, "%s", message
);
227 vsnprintf(message2
, 65535, format
, ap
);
228 snprintf(message
, 65535, "%02d/%02d %s", t
, s
, message2
);
229 syslog(level
+ 2, message
); // We don't need LOG_EMERG or LOG_ALERT
234 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
237 const u8
*d
= (const u8
*)data
;
239 if (config
->debug
< level
) return;
241 // No support for _log_hex to syslog
244 _log(level
, 0, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
245 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
247 for (i
= 0; i
< maxsize
; )
249 fprintf(log_stream
, "%4X: ", i
);
250 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
252 fprintf(log_stream
, "%02X ", d
[j
]);
254 fputs(": ", log_stream
);
257 for (; j
< i
+ 16; j
++)
259 fputs(" ", log_stream
);
261 fputs(": ", log_stream
);
264 fputs(" ", log_stream
);
265 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
267 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
268 fputc(d
[j
], log_stream
);
270 fputc('.', log_stream
);
273 fputs(" ", log_stream
);
277 fputs("\n", log_stream
);
281 setbuf(log_stream
, NULL
);
288 // This adds it to the routing table, advertises it
289 // via iBGP if enabled, and stuffs it into the
290 // 'sessionbyip' cache.
292 // 'ip' and 'mask' must be in _host_ order.
294 void routeset(sessionidt s
, ipt ip
, ipt mask
, ipt gw
, u8 add
)
299 if (!mask
) mask
= 0xffffffff;
301 ip
&= mask
; // Force the ip to be the first one in the route.
303 memset(&r
, 0, sizeof(r
));
304 r
.rt_dev
= config
->tundevice
;
305 r
.rt_dst
.sa_family
= AF_INET
;
306 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
307 r
.rt_gateway
.sa_family
= AF_INET
;
308 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
309 r
.rt_genmask
.sa_family
= AF_INET
;
310 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
311 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
313 r
.rt_flags
|= RTF_GATEWAY
;
314 else if (mask
== 0xffffffff)
315 r
.rt_flags
|= RTF_HOST
;
317 LOG(1, ip
, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n",
319 ip
>> 24, ip
>> 16 & 0xff, ip
>> 8 & 0xff, ip
& 0xff,
320 mask
>> 24, mask
>> 16 & 0xff, mask
>> 8 & 0xff, mask
& 0xff,
321 gw
>> 24, gw
>> 16 & 0xff, gw
>> 8 & 0xff, gw
& 0xff);
323 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
324 LOG(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
328 bgp_add_route(htonl(ip
), htonl(mask
));
330 bgp_del_route(htonl(ip
), htonl(mask
));
333 // Add/Remove the IPs to the 'sessionbyip' cache.
334 // Note that we add the zero address in the case of
335 // a network route. Roll on CIDR.
337 // Note that 's == 0' implies this is the address pool.
338 // We still cache it here, because it will pre-fill
339 // the malloc'ed tree.
343 if (!add
) // Are we deleting a route?
344 s
= 0; // Caching the session as '0' is the same as uncaching.
346 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
352 // Set up TUN interface
356 struct sockaddr_in sin
= {0};
357 memset(&ifr
, 0, sizeof(ifr
));
358 ifr
.ifr_flags
= IFF_TUN
;
360 tunfd
= open(TUNDEVICE
, O_RDWR
);
363 LOG(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
367 int flags
= fcntl(tunfd
, F_GETFL
, 0);
368 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
370 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
372 LOG(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
375 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
376 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
377 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
379 sin
.sin_family
= AF_INET
;
380 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
381 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
383 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
385 LOG(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
388 /* Bump up the qlen to deal with bursts from the network */
390 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
392 LOG(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
395 ifr
.ifr_flags
= IFF_UP
;
396 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
398 LOG(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
401 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
403 LOG(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno
));
406 tunidx
= ifr
.ifr_ifindex
;
413 struct sockaddr_in addr
;
416 memset(&addr
, 0, sizeof(addr
));
417 addr
.sin_family
= AF_INET
;
418 addr
.sin_port
= htons(L2TPPORT
);
419 addr
.sin_addr
.s_addr
= config
->bind_address
;
420 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
421 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
423 int flags
= fcntl(udpfd
, F_GETFL
, 0);
424 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
426 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
428 LOG(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
431 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
434 memset(&addr
, 0, sizeof(addr
));
435 addr
.sin_family
= AF_INET
;
436 addr
.sin_port
= htons(1702);
437 controlfd
= socket(AF_INET
, SOCK_DGRAM
, 17);
438 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
439 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
441 LOG(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
447 // Find session by IP, < 1 for not found
449 // Confusingly enough, this 'ip' must be
450 // in _network_ order. This being the common
451 // case when looking it up from IP packet headers.
453 // We actually use this cache for two things.
454 // #1. For used IP addresses, this maps to the
455 // session ID that it's used by.
456 // #2. For un-used IP addresses, this maps to the
457 // index into the pool table that contains that
461 int lookup_ipmap(ipt ip
)
464 char **d
= (char **) ip_hash
;
467 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
468 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
469 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
471 s
= (ipt
) d
[(size_t) *a
];
475 sessionidt
sessionbyip(ipt ip
)
477 int s
= lookup_ipmap(ip
);
478 CSTAT(call_sessionbyip
);
480 if (s
> 0 && s
< MAXSESSION
&& session
[s
].tunnel
)
486 // Take an IP address in HOST byte order and
487 // add it to the sessionid by IP cache.
489 // (It's actually cached in network order)
491 static void cache_ipmap(ipt ip
, int s
)
493 ipt nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0]
495 char **d
= (char **) ip_hash
;
498 for (i
= 0; i
< 3; i
++)
500 if (!d
[(size_t) a
[i
]])
502 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof (void *))))
506 d
= (char **) d
[(size_t) a
[i
]];
509 d
[(size_t) a
[3]] = (char *)((int)s
);
512 LOG(4, ip
, s
, session
[s
].tunnel
, "Caching ip address %s\n", inet_toa(nip
));
514 LOG(4, ip
, 0, 0, "Un-caching ip address %s\n", inet_toa(nip
));
515 // else a map to an ip pool index.
518 static void uncache_ipmap(ipt ip
)
520 cache_ipmap(ip
, 0); // Assign it to the NULL session.
524 // CLI list to dump current ipcache.
526 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
528 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
532 if (CLI_HELP_REQUESTED
)
533 return CLI_HELP_NO_ARGS
;
535 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
537 for (i
= 0; i
< 256; ++i
)
542 for (j
= 0; j
< 256; ++j
)
547 for (k
= 0; k
< 256; ++k
)
552 for (l
= 0; l
< 256; ++l
)
556 cli_print(cli
, "%7d %d.%d.%d.%d", (int) g
[l
], i
, j
, k
, l
);
562 cli_print(cli
, "%d entries in cache", count
);
567 // Find session by username, 0 for not found
568 // walled garden users aren't authenticated, so the username is
569 // reasonably useless. Ignore them to avoid incorrect actions
571 // This is VERY inefficent. Don't call it often. :)
573 sessionidt
sessionbyuser(char *username
)
576 CSTAT(call_sessionbyuser
);
578 for (s
= 1; s
< MAXSESSION
; ++s
)
580 if (session
[s
].walled_garden
)
581 continue; // Skip walled garden users.
583 if (!strncmp(session
[s
].user
, username
, 128))
587 return 0; // Not found.
590 void send_garp(ipt ip
)
596 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
599 LOG(0, 0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
602 memset(&ifr
, 0, sizeof(ifr
));
603 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
604 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
606 LOG(0, 0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
610 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
611 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
613 LOG(0, 0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
618 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
621 // Find session by username, 0 for not found
622 sessiont
*sessiontbysessionidt(sessionidt s
)
624 if (!s
|| s
> MAXSESSION
) return NULL
;
628 sessionidt
sessionidtbysessiont(sessiont
*s
)
630 sessionidt val
= s
-session
;
631 if (s
< session
|| val
> MAXSESSION
) return 0;
635 // actually send a control message for a specific tunnel
636 void tunnelsend(u8
* buf
, u16 l
, tunnelidt t
)
638 struct sockaddr_in addr
;
640 CSTAT(call_tunnelsend
);
644 static int backtrace_count
= 0;
645 LOG(0, 0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
646 STAT(tunnel_tx_errors
);
647 log_backtrace(backtrace_count
, 5)
653 static int backtrace_count
= 0;
654 LOG(1, 0, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
655 log_backtrace(backtrace_count
, 5)
656 STAT(tunnel_tx_errors
);
659 memset(&addr
, 0, sizeof(addr
));
660 addr
.sin_family
= AF_INET
;
661 *(u32
*) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
662 addr
.sin_port
= htons(tunnel
[t
].port
);
664 // sequence expected, if sequence in message
665 if (*buf
& 0x08) *(u16
*) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
667 // If this is a control message, deal with retries
670 tunnel
[t
].last
= time_now
; // control message sent
671 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
672 if (tunnel
[t
].try > 1)
674 STAT(tunnel_retries
);
675 LOG(3, tunnel
[t
].ip
, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
679 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
681 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",
682 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
683 STAT(tunnel_tx_errors
);
687 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
688 STAT(tunnel_tx_packets
);
689 INC_STAT(tunnel_tx_bytes
, l
);
693 // Tiny helper function to write data to
696 int tun_write(u8
* data
, int size
)
698 return write(tunfd
, data
, size
);
701 // process outgoing (to tunnel) IP
703 void processipout(u8
* buf
, int len
)
710 char * data
= buf
; // Keep a copy of the originals.
715 CSTAT(call_processipout
);
717 if (len
< MIN_IP_SIZE
)
719 LOG(1, 0, 0, 0, "Short IP, %d bytes\n", len
);
720 STAT(tunnel_tx_errors
);
725 LOG(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len
);
726 STAT(tunnel_tx_errors
);
730 // Skip the tun header
734 // Got an IP header now
735 if (*(u8
*)(buf
) >> 4 != 4)
737 LOG(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
741 ip
= *(u32
*)(buf
+ 16);
742 if (!(s
= sessionbyip(ip
)))
744 // Is this a packet for a session that doesn't exist?
745 static int rate
= 0; // Number of ICMP packets we've sent this second.
746 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
748 if (last
!= time_now
)
754 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
756 LOG(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32
*)(buf
+ 12)));
757 host_unreachable(*(u32
*)(buf
+ 12), *(u16
*)(buf
+ 4), ip
, buf
, (len
< 64) ? 64 : len
);
761 t
= session
[s
].tunnel
;
766 // Are we throttling this session?
767 if (config
->cluster_iam_master
)
768 tbf_queue_packet(sp
->tbf_out
, data
, size
);
770 master_throttle_packet(sp
->tbf_out
, data
, size
);
773 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
775 // We are walled-gardening this
776 master_garden_packet(s
, data
, size
);
780 LOG(5, session
[s
].ip
, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
782 // Add on L2TP header
784 u8
*p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
787 LOG(3, session
[s
].ip
, s
, t
, "failed to send packet in processipout.\n");
790 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
793 // Snooping this session, send it to intercept box
794 if (sp
->snoop_ip
&& sp
->snoop_port
)
795 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
797 sp
->cout
+= len
; // byte count
798 sp
->total_cout
+= len
; // byte count
801 sess_count
[s
].cout
+= len
; // To send to master..
805 // Helper routine for the TBF filters.
806 // Used to send queued data in to the user!
808 void send_ipout(sessionidt s
, u8
*buf
, int len
)
816 if (len
< 0 || len
> MAXETHER
)
818 LOG(1,0,0,0, "Odd size IP packet: %d bytes\n", len
);
822 // Skip the tun header
826 ip
= *(u32
*)(buf
+ 16);
831 t
= session
[s
].tunnel
;
834 LOG(5, session
[s
].ip
, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
836 // Add on L2TP header
838 u8
*p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
841 LOG(3, session
[s
].ip
, s
, t
, "failed to send packet in send_ipout.\n");
844 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
847 // Snooping this session.
848 if (sp
->snoop_ip
&& sp
->snoop_port
)
849 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
851 sp
->cout
+= len
; // byte count
852 sp
->total_cout
+= len
; // byte count
855 sess_count
[s
].cout
+= len
; // To send to master..
858 // add an AVP (16 bit)
859 void control16(controlt
* c
, u16 avp
, u16 val
, u8 m
)
861 u16 l
= (m
? 0x8008 : 0x0008);
862 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
863 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
864 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
865 *(u16
*) (c
->buf
+ c
->length
+ 6) = htons(val
);
869 // add an AVP (32 bit)
870 void control32(controlt
* c
, u16 avp
, u32 val
, u8 m
)
872 u16 l
= (m
? 0x800A : 0x000A);
873 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
874 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
875 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
876 *(u32
*) (c
->buf
+ c
->length
+ 6) = htonl(val
);
880 // add an AVP (32 bit)
881 void controls(controlt
* c
, u16 avp
, char *val
, u8 m
)
883 u16 l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
884 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
885 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
886 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
887 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
888 c
->length
+= 6 + strlen(val
);
892 void controlb(controlt
* c
, u16 avp
, char *val
, unsigned int len
, u8 m
)
894 u16 l
= ((m
? 0x8000 : 0) + len
+ 6);
895 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
896 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
897 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
898 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
899 c
->length
+= 6 + len
;
902 // new control connection
903 controlt
*controlnew(u16 mtype
)
907 c
= malloc(sizeof(controlt
));
911 controlfree
= c
->next
;
915 *(u16
*) (c
->buf
+ 0) = htons(0xC802); // flags/ver
917 control16(c
, 0, mtype
, 1);
921 // send zero block if nothing is waiting
923 void controlnull(tunnelidt t
)
926 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
929 *(u16
*) (buf
+ 0) = htons(0xC802); // flags/ver
930 *(u16
*) (buf
+ 2) = htons(12); // length
931 *(u16
*) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
932 *(u16
*) (buf
+ 6) = htons(0); // session
933 *(u16
*) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
934 *(u16
*) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
935 tunnelsend(buf
, 12, t
);
938 // add a control message to a tunnel, and send if within window
939 void controladd(controlt
* c
, tunnelidt t
, sessionidt s
)
941 *(u16
*) (c
->buf
+ 2) = htons(c
->length
); // length
942 *(u16
*) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
943 *(u16
*) (c
->buf
+ 6) = htons(s
? session
[s
].far
: 0); // session
944 *(u16
*) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
945 tunnel
[t
].ns
++; // advance sequence
946 // link in message in to queue
947 if (tunnel
[t
].controlc
)
948 tunnel
[t
].controle
->next
= c
;
950 tunnel
[t
].controls
= c
;
951 tunnel
[t
].controle
= c
;
952 tunnel
[t
].controlc
++;
953 // send now if space in window
954 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
956 tunnel
[t
].try = 0; // first send
957 tunnelsend(c
->buf
, c
->length
, t
);
962 // Throttle or Unthrottle a session
964 // Throttle the data from/to through a session to no more than
965 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
968 // If either value is -1, the current value is retained for that
971 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
973 if (!session
[s
].tunnel
)
974 return; // No-one home.
976 if (!*session
[s
].user
)
977 return; // User not logged in
981 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
982 if (session
[s
].tbf_in
)
983 free_tbf(session
[s
].tbf_in
);
986 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
988 session
[s
].tbf_in
= 0;
990 session
[s
].throttle_in
= rate_in
;
995 int bytes
= rate_out
* 1024 / 8;
996 if (session
[s
].tbf_out
)
997 free_tbf(session
[s
].tbf_out
);
1000 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1002 session
[s
].tbf_out
= 0;
1004 session
[s
].throttle_out
= rate_out
;
1008 // start tidy shutdown of session
1009 void sessionshutdown(sessionidt s
, char *reason
)
1011 int dead
= session
[s
].die
;
1012 int walled_garden
= session
[s
].walled_garden
;
1015 CSTAT(call_sessionshutdown
);
1017 if (!session
[s
].tunnel
)
1019 LOG(3, session
[s
].ip
, s
, session
[s
].tunnel
, "Called sessionshutdown on a session with no tunnel.\n");
1020 return; // not a live session
1024 LOG(2, 0, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1026 session
[s
].die
= now() + 150; // Clean up in 15 seconds
1029 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1030 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1033 // RADIUS Stop message
1034 if (session
[s
].opened
&& !walled_garden
&& !dead
)
1036 u16 r
= session
[s
].radius
;
1039 if (!(r
= radiusnew(s
)))
1041 LOG(1, 0, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1042 STAT(radius_overflow
);
1047 for (n
= 0; n
< 15; n
++)
1048 radius
[r
].auth
[n
] = rand();
1051 if (r
&& radius
[r
].state
!= RADIUSSTOP
)
1052 radiussend(r
, RADIUSSTOP
); // stop, if not already trying
1056 { // IP allocated, clear and unroute
1058 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1060 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, session
[s
].ip
, 0);
1061 session
[s
].route
[r
].ip
= 0;
1064 if (session
[s
].ip_pool_index
== -1) // static ip
1066 routeset(s
, session
[s
].ip
, 0, 0, 0); // Delete route.
1073 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1074 throttle_session(s
, 0, 0);
1077 controlt
*c
= controlnew(14); // sending CDN
1078 control16(c
, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message
1079 control16(c
, 14, s
, 1); // assigned session (our end)
1080 controladd(c
, session
[s
].tunnel
, s
); // send the message
1083 cluster_send_session(s
);
1086 void sendipcp(tunnelidt t
, sessionidt s
)
1089 u16 r
= session
[s
].radius
;
1092 CSTAT(call_sendipcp
);
1097 if (radius
[r
].state
!= RADIUSIPCP
)
1099 radius
[r
].state
= RADIUSIPCP
;
1103 radius
[r
].retry
= backoff(radius
[r
].try++);
1104 if (radius
[r
].try > 10)
1106 radiusclear(r
, s
); // Clear radius session.
1107 sessionshutdown(s
, "No reply on IPCP");
1111 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1114 LOG(3, session
[s
].ip
, s
, t
, "failed to send packet in sendipcp.\n");
1119 q
[1] = r
<< RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1120 *(u16
*) (q
+ 2) = htons(10);
1123 *(u32
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1124 config
->bind_address
? config
->bind_address
:
1125 my_address
; // send my IP
1127 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1128 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1131 // kill a session now
1132 void sessionkill(sessionidt s
, char *reason
)
1135 CSTAT(call_sessionkill
);
1137 session
[s
].die
= now();
1138 sessionshutdown(s
, reason
); // close radius/routes, etc.
1139 if (session
[s
].radius
)
1140 radiusclear(session
[s
].radius
, s
); // cant send clean accounting data, session is killed
1142 LOG(2, 0, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1144 memset(&session
[s
], 0, sizeof(session
[s
]));
1145 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1146 session
[s
].next
= sessionfree
;
1148 cli_session_actions
[s
].action
= 0;
1149 cluster_send_session(s
);
1152 // kill a tunnel now
1153 void tunnelkill(tunnelidt t
, char *reason
)
1158 CSTAT(call_tunnelkill
);
1160 tunnel
[t
].state
= TUNNELDIE
;
1162 // free control messages
1163 while ((c
= tunnel
[t
].controls
))
1165 controlt
* n
= c
->next
;
1166 tunnel
[t
].controls
= n
;
1167 tunnel
[t
].controlc
--;
1168 c
->next
= controlfree
;
1172 for (s
= 1; s
< MAXSESSION
; s
++)
1173 if (session
[s
].tunnel
== t
)
1174 sessionkill(s
, reason
);
1178 LOG(1, 0, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1179 cli_tunnel_actions
[s
].action
= 0;
1180 cluster_send_tunnel(t
);
1183 // shut down a tunnel cleanly
1184 void tunnelshutdown(tunnelidt t
, char *reason
)
1188 CSTAT(call_tunnelshutdown
);
1190 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1192 // never set up, can immediately kill
1193 tunnelkill(t
, reason
);
1196 LOG(1, 0, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1199 for (s
= 1; s
< MAXSESSION
; s
++)
1200 if (session
[s
].tunnel
== t
)
1201 sessionkill(s
, reason
);
1203 tunnel
[t
].state
= TUNNELDIE
;
1204 tunnel
[t
].die
= now() + 700; // Clean up in 70 seconds
1205 cluster_send_tunnel(t
);
1206 // TBA - should we wait for sessions to stop?
1208 controlt
*c
= controlnew(4); // sending StopCCN
1209 control16(c
, 1, 1, 1); // result code (admin reasons - TBA make error, general error, add message
1210 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1211 controladd(c
, t
, 0); // send the message
1215 // read and process packet on tunnel (UDP)
1216 void processudp(u8
* buf
, int len
, struct sockaddr_in
*addr
)
1218 char *chapresponse
= NULL
;
1219 u16 l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1223 CSTAT(call_processudp
);
1227 LOG_HEX(5, "UDP Data", buf
, len
);
1228 STAT(tunnel_rx_packets
);
1229 INC_STAT(tunnel_rx_bytes
, len
);
1232 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Short UDP, %d bytes\n", len
);
1233 STAT(tunnel_rx_errors
);
1236 if ((buf
[1] & 0x0F) != 2)
1238 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1239 STAT(tunnel_rx_errors
);
1244 l
= ntohs(*(u16
*) p
);
1247 t
= ntohs(*(u16
*) p
);
1249 s
= ntohs(*(u16
*) p
);
1251 if (s
>= MAXSESSION
)
1253 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Received UDP packet with invalid session ID\n");
1254 STAT(tunnel_rx_errors
);
1259 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Received UDP packet with invalid tunnel ID\n");
1260 STAT(tunnel_rx_errors
);
1265 ns
= ntohs(*(u16
*) p
);
1267 nr
= ntohs(*(u16
*) p
);
1272 u16 o
= ntohs(*(u16
*) p
);
1277 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Bad length %d>%d\n", (p
- buf
), l
);
1278 STAT(tunnel_rx_errors
);
1284 u16 message
= 0xFFFF; // message type
1286 u8 mandatorymessage
= 0;
1287 u8 chap
= 0; // if CHAP being used
1288 u16 asession
= 0; // assigned session
1289 u32 amagic
= 0; // magic number
1290 u8 aflags
= 0; // flags from last LCF
1291 u16 version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1292 int requestchap
= 0; // do we request PAP instead of original CHAP request?
1293 char called
[MAXTEL
] = ""; // called number
1294 char calling
[MAXTEL
] = ""; // calling number
1296 if (!config
->cluster_iam_master
)
1298 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1302 if ((*buf
& 0xCA) != 0xC8)
1304 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Bad control header %02X\n", *buf
);
1305 STAT(tunnel_rx_errors
);
1308 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",
1309 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1310 // if no tunnel specified, assign one
1316 // Is this a duplicate of the first packet? (SCCRQ)
1318 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1320 if (tunnel
[i
].state
!= TUNNELOPENING
||
1321 tunnel
[i
].ip
!= ntohl(*(ipt
*) & addr
->sin_addr
) ||
1322 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1331 if (!(t
= new_tunnel()))
1333 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "No more tunnels\n");
1334 STAT(tunnel_overflow
);
1338 tunnel
[t
].ip
= ntohl(*(ipt
*) & addr
->sin_addr
);
1339 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1340 tunnel
[t
].window
= 4; // default window
1341 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
);
1342 STAT(tunnel_created
);
1345 // This is used to time out old tunnels
1346 tunnel
[t
].lastrec
= time_now
;
1348 // check sequence of this message
1350 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1351 // some to clear maybe?
1352 while (tunnel
[t
].controlc
&& (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1354 controlt
*c
= tunnel
[t
].controls
;
1355 tunnel
[t
].controls
= c
->next
;
1356 tunnel
[t
].controlc
--;
1357 c
->next
= controlfree
;
1360 tunnel
[t
].try = 0; // we have progress
1363 // If the 'ns' just received is not the 'nr' we're
1364 // expecting, just send an ack and drop it.
1366 // if 'ns' is less, then we got a retransmitted packet.
1367 // if 'ns' is greater than missed a packet. Either way
1368 // we should ignore it.
1369 if (ns
!= tunnel
[t
].nr
)
1371 // is this the sequence we were expecting?
1372 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
);
1373 STAT(tunnel_rx_errors
);
1375 if (l
) // Is this not a ZLB?
1379 // receiver advance (do here so quoted correctly in any sends below)
1380 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1381 if (skip
< 0) skip
= 0;
1382 if (skip
< tunnel
[t
].controlc
)
1384 // some control packets can now be sent that were previous stuck out of window
1385 int tosend
= tunnel
[t
].window
- skip
;
1386 controlt
*c
= tunnel
[t
].controls
;
1394 tunnel
[t
].try = 0; // first send
1395 tunnelsend(c
->buf
, c
->length
, t
);
1400 if (!tunnel
[t
].controlc
)
1401 tunnel
[t
].retry
= 0; // caught up
1404 { // if not a null message
1406 while (l
&& !(fatal
& 0x80))
1408 u16 n
= (ntohs(*(u16
*) p
) & 0x3FF);
1415 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Invalid length in AVP\n");
1416 STAT(tunnel_rx_errors
);
1423 // handle hidden AVPs
1424 if (!*config
->l2tpsecret
)
1426 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1430 if (!session
[s
].random_vector_length
)
1432 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP requested, but no random vector.\n");
1436 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP\n");
1438 n
= unhide_avp(b
, t
, s
, n
);
1447 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1454 LOG(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown AVP vendor %d\n", ntohs(*(u16
*) (b
)));
1459 mtype
= ntohs(*(u16
*) (b
));
1463 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " AVP %d (%s) len %d\n", mtype
, avpnames
[mtype
], n
);
1466 case 0: // message type
1467 message
= ntohs(*(u16
*) b
);
1468 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Message type = %d (%s)\n", *b
,
1469 l2tp_message_types
[message
]);
1470 mandatorymessage
= flags
;
1472 case 1: // result code
1474 u16 rescode
= ntohs(*(u16
*)(b
));
1475 const char* resdesc
= "(unknown)";
1478 if (rescode
<= MAX_STOPCCN_RESULT_CODE
)
1479 resdesc
= stopccn_result_codes
[rescode
];
1481 else if (message
== 14)
1483 if (rescode
<= MAX_CDN_RESULT_CODE
)
1484 resdesc
= cdn_result_codes
[rescode
];
1487 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Result Code %d: %s\n",
1491 u16 errcode
= ntohs(*(u16
*)(b
+ 2));
1492 const char* errdesc
= "(unknown)";
1493 if (errcode
<= MAX_ERROR_CODE
)
1494 errdesc
= error_codes
[errcode
];
1495 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Error Code %d: %s\n",
1499 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Error String: %.*s\n",
1505 case 2: // protocol version
1507 version
= ntohs(*(u16
*) (b
));
1508 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Protocol version = %d\n", version
);
1509 if (version
&& version
!= 0x0100)
1510 { // allow 0.0 and 1.0
1511 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Bad protocol version %04X\n",
1518 case 3: // framing capabilities
1519 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
1521 case 4: // bearer capabilities
1522 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n");
1524 case 5: // tie breaker
1525 // We never open tunnels, so we don't care about tie breakers
1526 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
1528 case 6: // firmware revision
1529 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
1531 case 7: // host name
1532 memset(tunnel
[t
].hostname
, 0, 128);
1533 memcpy(tunnel
[t
].hostname
, b
, (n
>= 127) ? 127 : n
);
1534 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
1535 // TBA - to send to RADIUS
1537 case 8: // vendor name
1538 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
1539 memcpy(tunnel
[t
].vendor
, b
, (n
>= sizeof(tunnel
[t
].vendor
) - 1) ? sizeof(tunnel
[t
].vendor
) - 1 : n
);
1540 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
1542 case 9: // assigned tunnel
1543 tunnel
[t
].far
= ntohs(*(u16
*) (b
));
1544 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
1546 case 10: // rx window
1547 tunnel
[t
].window
= ntohs(*(u16
*) (b
));
1548 if (!tunnel
[t
].window
)
1549 tunnel
[t
].window
= 1; // window of 0 is silly
1550 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " rx window = %d\n", tunnel
[t
].window
);
1552 case 11: // Challenge
1554 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " LAC requested CHAP authentication for tunnel\n");
1555 build_chap_response(b
, 2, n
, &chapresponse
);
1558 case 13: // Response
1559 // Why did they send a response? We never challenge.
1560 LOG(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " received unexpected challenge response\n");
1563 case 14: // assigned session
1564 asession
= session
[s
].far
= ntohs(*(u16
*) (b
));
1565 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " assigned session = %d\n", asession
);
1567 case 15: // call serial number
1568 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " call serial number = %d\n", ntohl(*(u32
*)b
));
1570 case 18: // bearer type
1571 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " bearer type = %d\n", ntohl(*(u32
*)b
));
1574 case 19: // framing type
1575 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " framing type = %d\n", ntohl(*(u32
*)b
));
1578 case 21: // called number
1579 memset(called
, 0, MAXTEL
);
1580 memcpy(called
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
1581 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Called <%s>\n", called
);
1583 case 22: // calling number
1584 memset(calling
, 0, MAXTEL
);
1585 memcpy(calling
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
1586 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Calling <%s>\n", calling
);
1590 case 24: // tx connect speed
1593 session
[s
].tx_connect_speed
= ntohl(*(u32
*)b
);
1597 // AS5300s send connect speed as a string
1599 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
1600 session
[s
].tx_connect_speed
= atol(tmp
);
1602 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " TX connect speed <%u>\n",
1603 session
[s
].tx_connect_speed
);
1605 case 38: // rx connect speed
1608 session
[s
].rx_connect_speed
= ntohl(*(u32
*)b
);
1612 // AS5300s send connect speed as a string
1614 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
1615 session
[s
].rx_connect_speed
= atol(tmp
);
1617 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " RX connect speed <%u>\n",
1618 session
[s
].rx_connect_speed
);
1620 case 25: // Physical Channel ID
1622 u32 tmp
= ntohl(*(u32
*)b
);
1623 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Physical Channel ID <%X>\n", tmp
);
1626 case 29: // Proxy Authentication Type
1628 u16 authtype
= ntohs(*(u16
*)b
);
1629 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Type %d (%s)\n",
1630 authtype
, authtypes
[authtype
]);
1631 requestchap
= (authtype
== 2);
1634 case 30: // Proxy Authentication Name
1636 char authname
[64] = {0};
1637 memcpy(authname
, b
, (n
> 63) ? 63 : n
);
1638 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Name (%s)\n",
1642 case 31: // Proxy Authentication Challenge
1644 memcpy(radius
[session
[s
].radius
].auth
, b
, 16);
1645 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Challenge\n");
1648 case 32: // Proxy Authentication ID
1650 u16 authid
= ntohs(*(u16
*)(b
));
1651 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth ID (%d)\n",
1653 if (session
[s
].radius
)
1654 radius
[session
[s
].radius
].id
= authid
;
1657 case 33: // Proxy Authentication Response
1659 char authresp
[64] = {0};
1660 memcpy(authresp
, b
, (n
> 63) ? 63 : n
);
1661 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Response\n");
1664 case 27: // last send lcp
1665 { // find magic number
1666 u8
*p
= b
, *e
= p
+ n
;
1667 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
1669 if (*p
== 5 && p
[1] == 6) // Magic-Number
1670 amagic
= ntohl(*(u32
*) (p
+ 2));
1671 else if (*p
== 3 && p
[1] == 5 && *(u16
*) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol
1673 else if (*p
== 7) // Protocol-Field-Compression
1674 aflags
|= SESSIONPFC
;
1675 else if (*p
== 8) // Address-and-Control-Field-Compression
1676 aflags
|= SESSIONACFC
;
1681 case 28: // last recv lcp confreq
1683 case 26: // Initial Received LCP CONFREQ
1685 case 39: // seq required - we control it as an LNS anyway...
1687 case 36: // Random Vector
1688 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
1689 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
1690 memcpy(session
[s
].random_vector
, b
, n
);
1691 session
[s
].random_vector_length
= n
;
1694 LOG(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Unknown AVP type %d\n", mtype
);
1701 tunnelshutdown(t
, "Unknown Mandatory AVP");
1705 case 1: // SCCRQ - Start Control Connection Request
1707 controlt
*c
= controlnew(2); // sending SCCRP
1708 control16(c
, 2, version
, 1); // protocol version
1709 control32(c
, 3, 3, 1); // framing
1710 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
1711 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
1712 control16(c
, 9, t
, 1); // assigned tunnel
1713 controladd(c
, t
, s
); // send the resply
1715 tunnel
[t
].state
= TUNNELOPENING
;
1718 tunnel
[t
].state
= TUNNELOPEN
;
1721 tunnel
[t
].state
= TUNNELOPEN
;
1722 controlnull(t
); // ack
1725 controlnull(t
); // ack
1726 tunnelshutdown(t
, "Stopped"); // Shut down cleanly
1727 tunnelkill(t
, "Stopped"); // Immediately force everything dead
1730 controlnull(t
); // simply ACK
1744 STAT(session_overflow
);
1745 tunnelshutdown(t
, "No free sessions");
1753 sessionfree
= session
[s
].next
;
1754 memset(&session
[s
], 0, sizeof(session
[s
]));
1756 if (s
> config
->cluster_highest_sessionid
)
1757 config
->cluster_highest_sessionid
= s
;
1759 // make a RADIUS session
1760 if (!(r
= radiusnew(s
)))
1762 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "No free RADIUS sessions for ICRQ\n");
1763 sessionkill(s
, "no free RADIUS sesions");
1767 c
= controlnew(11); // sending ICRP
1768 session
[s
].id
= sessionid
++;
1769 session
[s
].opened
= time(NULL
);
1770 session
[s
].tunnel
= t
;
1771 session
[s
].far
= asession
;
1772 session
[s
].last_packet
= time_now
;
1773 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
1774 control16(c
, 14, s
, 1); // assigned session
1775 controladd(c
, t
, s
); // send the reply
1777 // Generate a random challenge
1779 for (n
= 0; n
< 15; n
++)
1780 radius
[r
].auth
[n
] = rand();
1782 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
1783 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
1784 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
1785 STAT(session_created
);
1792 if (amagic
== 0) amagic
= time_now
;
1793 session
[s
].magic
= amagic
; // set magic number
1794 session
[s
].l2tp_flags
= aflags
; // set flags received
1795 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
1796 controlnull(t
); // ack
1797 // In CHAP state, request PAP instead
1802 controlnull(t
); // ack
1803 sessionshutdown(s
, "Closed (Received CDN)");
1806 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Missing message type\n");
1809 STAT(tunnel_rx_errors
);
1810 if (mandatorymessage
& 0x80)
1811 tunnelshutdown(t
, "Unknown message");
1813 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown message type %d\n", message
);
1816 if (chapresponse
) free(chapresponse
);
1817 cluster_send_tunnel(t
);
1821 LOG(4, 0, s
, t
, " Got a ZLB ack\n");
1828 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
1829 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
1830 { // HDLC address header, discard
1836 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Short ppp length %d\n", l
);
1837 STAT(tunnel_rx_errors
);
1847 prot
= ntohs(*(u16
*) p
);
1852 if (s
&& !session
[s
].tunnel
) // Is something wrong??
1854 if (!config
->cluster_iam_master
)
1856 // Pass it off to the master to deal with..
1857 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1862 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "UDP packet contains session %d "
1863 "but no session[%d].tunnel exists (LAC said"
1864 " tunnel = %d). Dropping packet.\n", s
, s
, t
);
1865 STAT(tunnel_rx_errors
);
1871 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
1872 // I'm pretty sure this isn't right -- mo.
1873 // return; // closing session, PPP not processed
1877 session
[s
].last_packet
= time_now
;
1878 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1879 processpap(t
, s
, p
, l
);
1881 else if (prot
== PPPCHAP
)
1883 session
[s
].last_packet
= time_now
;
1884 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1885 processchap(t
, s
, p
, l
);
1887 else if (prot
== PPPLCP
)
1889 session
[s
].last_packet
= time_now
;
1890 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1891 processlcp(t
, s
, p
, l
);
1893 else if (prot
== PPPIPCP
)
1895 session
[s
].last_packet
= time_now
;
1896 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1897 processipcp(t
, s
, p
, l
);
1899 else if (prot
== PPPCCP
)
1901 session
[s
].last_packet
= time_now
;
1902 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1903 processccp(t
, s
, p
, l
);
1905 else if (prot
== PPPIP
)
1907 session
[s
].last_packet
= time_now
;
1908 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
1910 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1913 processipin(t
, s
, p
, l
);
1917 STAT(tunnel_rx_errors
);
1918 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown PPP protocol %04X\n", prot
);
1923 // read and process packet on tun
1924 void processtun(u8
* buf
, int len
)
1926 LOG_HEX(5, "Receive TUN Data", buf
, len
);
1927 STAT(tun_rx_packets
);
1928 INC_STAT(tun_rx_bytes
, len
);
1930 CSTAT(call_processtun
);
1936 LOG(1, 0, 0, 0, "Short tun packet %d bytes\n", len
);
1937 STAT(tun_rx_errors
);
1941 if (*(u16
*) (buf
+ 2) == htons(PKTIP
)) // IP
1942 processipout(buf
, len
);
1947 // Maximum number of actions to complete.
1948 // This is to avoid sending out too many packets
1950 #define MAX_ACTIONS 500
1952 int regular_cleanups(void)
1954 static sessionidt s
= 0; // Next session to check for actions on.
1958 static clockt next_acct
= 0;
1961 LOG(3, 0, 0, 0, "Begin regular cleanup\n");
1963 for (r
= 1; r
< MAXRADIUS
; r
++)
1965 if (!radius
[r
].state
)
1967 if (radius
[r
].retry
)
1969 if (radius
[r
].retry
<= TIME
)
1972 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
1974 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
1976 // check for expired tunnels
1977 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
1979 STAT(tunnel_timeout
);
1980 tunnelkill(t
, "Expired");
1983 // check for message resend
1984 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
1986 // resend pending messages as timeout on reply
1987 if (tunnel
[t
].retry
<= TIME
)
1989 controlt
*c
= tunnel
[t
].controls
;
1990 u8 w
= tunnel
[t
].window
;
1991 tunnel
[t
].try++; // another try
1992 if (tunnel
[t
].try > 5)
1993 tunnelkill(t
, "Timeout on control message"); // game over
1997 tunnelsend(c
->buf
, c
->length
, t
);
2003 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2005 controlt
*c
= controlnew(6); // sending HELLO
2006 controladd(c
, t
, 0); // send the message
2007 LOG(3, tunnel
[t
].ip
, 0, t
, "Sending HELLO message\n");
2010 // Check for tunnel changes requested from the CLI
2011 if ((a
= cli_tunnel_actions
[t
].action
))
2013 cli_tunnel_actions
[t
].action
= 0;
2014 if (a
& CLI_TUN_KILL
)
2016 LOG(2, tunnel
[t
].ip
, 0, t
, "Dropping tunnel by CLI\n");
2017 tunnelshutdown(t
, "Requested by administrator");
2024 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2027 if (s
> config
->cluster_highest_sessionid
)
2030 if (!session
[s
].tunnel
) // Session isn't in use
2033 if (!session
[s
].die
&& session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2035 // IPCP has not completed yet. Resend
2036 LOG(3, session
[s
].ip
, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2037 sendipcp(session
[s
].tunnel
, s
);
2040 // check for expired sessions
2041 if (session
[s
].die
&& session
[s
].die
<= TIME
)
2043 sessionkill(s
, "Expired");
2044 if (++count
>= MAX_ACTIONS
) break;
2048 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2049 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2051 sessionkill(s
, "No response to LCP ECHO requests");
2052 STAT(session_timeout
);
2053 if (++count
>= MAX_ACTIONS
) break;
2057 // No data in IDLE_TIMEOUT seconds, send LCP ECHO
2058 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2060 u8 b
[MAXCONTROL
] = {0};
2062 u8
*q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2065 LOG(3, session
[s
].ip
, s
, t
, "failed to send ECHO packet.\n");
2070 *(u8
*)(q
+ 1) = (time_now
% 255); // ID
2071 *(u16
*)(q
+ 2) = htons(8); // Length
2072 *(u32
*)(q
+ 4) = 0; // Magic Number (not supported)
2074 LOG(4, session
[s
].ip
, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2075 (int)(time_now
- session
[s
].last_packet
));
2076 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2077 if (++count
>= MAX_ACTIONS
) break;
2080 // Check for actions requested from the CLI
2081 if ((a
= cli_session_actions
[s
].action
))
2085 cli_session_actions
[s
].action
= 0;
2086 if (a
& CLI_SESS_KILL
)
2088 LOG(2, 0, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2089 sessionshutdown(s
, "Requested by administrator");
2090 a
= 0; // dead, no need to check for other actions
2093 if (a
& CLI_SESS_NOSNOOP
)
2095 LOG(2, 0, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2096 session
[s
].snoop_ip
= 0;
2097 session
[s
].snoop_port
= 0;
2100 else if (a
& CLI_SESS_SNOOP
)
2102 LOG(2, 0, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2103 inet_toa(cli_session_actions
[s
].snoop_ip
), cli_session_actions
[s
].snoop_port
);
2105 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2106 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2110 if (a
& CLI_SESS_NOTHROTTLE
)
2112 LOG(2, 0, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2113 throttle_session(s
, 0, 0);
2116 else if (a
& CLI_SESS_THROTTLE
)
2118 LOG(2, 0, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2119 cli_session_actions
[s
].throttle_in
,
2120 cli_session_actions
[s
].throttle_out
);
2122 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2127 cluster_send_session(s
);
2129 if (++count
>= MAX_ACTIONS
) break;
2133 if (*config
->accounting_dir
&& next_acct
<= TIME
)
2135 // Dump accounting data
2136 next_acct
= TIME
+ ACCT_TIME
;
2140 if (count
>= MAX_ACTIONS
)
2141 return 1; // Didn't finish!
2143 LOG(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2149 // Are we in the middle of a tunnel update, or radius
2152 int still_busy(void)
2155 static clockt last_talked
= 0;
2156 static clockt start_busy_wait
= 0;
2157 if (start_busy_wait
== 0)
2158 start_busy_wait
= TIME
;
2160 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2162 if (!tunnel
[i
].controlc
)
2165 if (last_talked
!= TIME
)
2167 LOG(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i
);
2173 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2174 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2176 LOG(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2180 for (i
= 1; i
< MAXRADIUS
; i
++)
2182 if (radius
[i
].state
== RADIUSNULL
)
2184 if (radius
[i
].state
== RADIUSWAIT
)
2187 if (last_talked
!= TIME
)
2189 LOG(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2198 static fd_set readset
;
2199 static int readset_n
= 0;
2201 // main loop - gets packets on tun or udp and processes them
2207 clockt next_cluster_ping
= 0; // send initial ping immediately
2208 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2210 LOG(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2211 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2214 FD_SET(udpfd
, &readset
);
2215 FD_SET(tunfd
, &readset
);
2216 FD_SET(controlfd
, &readset
);
2217 FD_SET(clifd
, &readset
);
2218 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2220 if (tunfd
> readset_n
) readset_n
= tunfd
;
2221 if (controlfd
> readset_n
) readset_n
= controlfd
;
2222 if (clifd
> readset_n
) readset_n
= clifd
;
2223 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2225 while (!main_quit
|| still_busy())
2231 int bgp_set
[BGP_NUM_PEERS
];
2234 if (config
->reload_config
)
2236 // Update the config state based on config settings
2240 memcpy(&r
, &readset
, sizeof(fd_set
));
2242 to
.tv_usec
= 100000; // 1/10th of a second.
2246 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2248 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2251 FD_SET(bgp_peers
[i
].sock
, &r
);
2252 if (bgp_peers
[i
].sock
> n
)
2253 n
= bgp_peers
[i
].sock
;
2258 FD_SET(bgp_peers
[i
].sock
, &w
);
2259 if (bgp_peers
[i
].sock
> n
)
2260 n
= bgp_peers
[i
].sock
;
2264 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2266 n
= select(n
+ 1, &r
, 0, 0, &to
);
2272 if (errno
== EINTR
||
2273 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2276 LOG(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2282 struct sockaddr_in addr
;
2283 int alen
= sizeof(addr
);
2284 if (FD_ISSET(udpfd
, &r
))
2287 for (c
= 0; c
< config
->multi_read_count
; c
++)
2289 if ((n
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
2290 processudp(buf
, n
, &addr
);
2295 if (FD_ISSET(tunfd
, &r
))
2298 for (c
= 0; c
< config
->multi_read_count
; c
++)
2300 if ((n
= read(tunfd
, buf
, sizeof(buf
))) > 0)
2307 if (config
->cluster_iam_master
)
2308 for (i
= 0; i
< config
->num_radfds
; i
++)
2309 if (FD_ISSET(radfds
[i
], &r
))
2310 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2312 if (FD_ISSET(cluster_sockfd
, &r
))
2315 size
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
);
2316 processcluster(buf
, size
, addr
.sin_addr
.s_addr
);
2319 if (FD_ISSET(controlfd
, &r
))
2320 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
);
2322 if (FD_ISSET(clifd
, &r
))
2324 struct sockaddr_in addr
;
2326 int len
= sizeof(addr
);
2328 if ((sockfd
= accept(clifd
, (struct sockaddr
*)&addr
, &len
)) <= 0)
2330 LOG(0, 0, 0, 0, "accept error: %s\n", strerror(errno
));
2341 // Runs on every machine (master and slaves).
2342 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
2344 // Check to see which of the cluster is still alive..
2346 cluster_send_ping(basetime
); // Only does anything if we're a slave
2347 cluster_check_master(); // ditto.
2349 cluster_heartbeat(); // Only does anything if we're a master.
2350 cluster_check_slaves(); // ditto.
2352 master_update_counts(); // If we're a slave, send our byte counters to our master.
2354 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
2355 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
2357 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
2360 // Run token bucket filtering queue..
2361 // Only run it every 1/10th of a second.
2362 // Runs on all machines both master and slave.
2364 static clockt last_run
= 0;
2365 if (last_run
!= TIME
)
2372 /* Handle timeouts. Make sure that this gets run anyway, even if there was
2373 * something to read, else under load this will never actually run....
2376 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
2378 if (regular_cleanups())
2381 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
2385 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
2390 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2392 bgp_process(&bgp_peers
[i
],
2393 bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0,
2394 bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0);
2399 // Are we the master and shutting down??
2400 if (config
->cluster_iam_master
)
2401 cluster_heartbeat(); // Flush any queued changes..
2403 // Ok. Notify everyone we're shutting down. If we're
2404 // the master, this will force an election.
2405 cluster_send_ping(0);
2408 // Important!!! We MUST not process any packets past this point!
2411 static void stripdomain(char *host
)
2415 if ((p
= strchr(host
, '.')))
2421 FILE *resolv
= fopen("/etc/resolv.conf", "r");
2427 while (fgets(buf
, sizeof(buf
), resolv
))
2429 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
2432 if (!isspace(buf
[6]))
2436 while (isspace(*b
)) b
++;
2441 while (*b
&& !isspace(*b
)) b
++;
2443 if (buf
[0] == 'd') // domain is canonical
2449 // first search line
2452 // hold, may be subsequent domain line
2453 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
2464 int hl
= strlen(host
);
2465 int dl
= strlen(domain
);
2466 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
2467 host
[hl
-dl
- 1] = 0;
2471 *p
= 0; // everything after first dot
2476 // Init data structures
2477 void initdata(int optdebug
, char *optconfig
)
2481 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
2483 LOG(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
2486 if (!(config
= shared_malloc(sizeof(struct configt
))))
2488 LOG(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno
));
2491 memset(config
, 0, sizeof(struct configt
));
2492 time(&config
->start_time
);
2493 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
2494 config
->debug
= optdebug
;
2495 config
->num_tbfs
= MAXTBFS
;
2496 config
->rl_rate
= 28; // 28kbps
2498 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
2500 LOG(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
2503 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
2505 LOG(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
2509 if (!(sess_count
= shared_malloc(sizeof(sessioncountt
) * MAXSESSION
)))
2511 LOG(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno
));
2515 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
2517 LOG(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
2521 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
2523 LOG(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
2528 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
2530 LOG(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
2533 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
2536 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
2538 LOG(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
2541 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
2543 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
2545 LOG(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
2548 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
2550 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
2551 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
2552 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
2553 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
2555 // Put all the sessions on the free list marked as undefined.
2556 for (i
= 1; i
< MAXSESSION
- 1; i
++)
2558 session
[i
].next
= i
+ 1;
2559 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
2561 session
[MAXSESSION
- 1].next
= 0;
2564 // Mark all the tunnels as undefined (waiting to be filled in by a download).
2565 for (i
= 1; i
< MAXTUNNEL
- 1; i
++)
2566 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
2570 // Grab my hostname unless it's been specified
2571 gethostname(hostname
, sizeof(hostname
));
2572 stripdomain(hostname
);
2575 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
2578 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
2580 LOG(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
2586 int assign_ip_address(sessionidt s
)
2590 time_t best_time
= time_now
;
2591 char *u
= session
[s
].user
;
2595 CSTAT(call_assign_ip_address
);
2597 for (i
= 1; i
< ip_pool_size
; i
++)
2599 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
2602 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
2609 if (ip_address_pool
[i
].last
< best_time
)
2612 if (!(best_time
= ip_address_pool
[i
].last
))
2613 break; // never used, grab this one
2619 LOG(0, 0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
2623 session
[s
].ip
= ip_address_pool
[best
].address
;
2624 session
[s
].ip_pool_index
= best
;
2625 ip_address_pool
[best
].assigned
= 1;
2626 ip_address_pool
[best
].last
= time_now
;
2627 ip_address_pool
[best
].session
= s
;
2628 if (session
[s
].walled_garden
)
2629 /* Don't track addresses of users in walled garden (note: this
2630 means that their address isn't "sticky" even if they get
2632 ip_address_pool
[best
].user
[0] = 0;
2634 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
2637 LOG(4, ip_address_pool
[best
].address
, s
, session
[s
].tunnel
,
2638 "assign_ip_address(): %s ip address %d from pool\n", reuse
? "Reusing" : "Allocating", best
);
2643 void free_ip_address(sessionidt s
)
2645 int i
= session
[s
].ip_pool_index
;
2648 return; // what the?
2650 if (i
< 0) // Is this actually part of the ip pool?
2654 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
2656 ip_address_pool
[i
].assigned
= 0;
2657 ip_address_pool
[i
].session
= 0;
2658 ip_address_pool
[i
].last
= time_now
;
2661 CSTAT(call_free_ip_address
);
2666 // Fsck the address pool against the session table.
2667 // Normally only called when we become a master.
2669 // This isn't perfect: We aren't keep tracking of which
2670 // users used to have an IP address.
2672 void rebuild_address_pool(void)
2677 // Zero the IP pool allocation, and build
2678 // a map from IP address to pool index.
2679 for (i
= 1; i
< MAXIPPOOL
; ++i
)
2681 ip_address_pool
[i
].assigned
= 0;
2682 ip_address_pool
[i
].session
= 0;
2683 if (!ip_address_pool
[i
].address
)
2686 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
2689 for (i
= 0; i
< MAXSESSION
; ++i
)
2692 if (!session
[i
].ip
|| !session
[i
].tunnel
)
2694 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
2696 if (session
[i
].ip_pool_index
< 0)
2698 // Not allocated out of the pool.
2699 if (ipid
< 1) // Not found in the pool either? good.
2702 LOG(0, 0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
2703 i
, inet_toa(session
[i
].ip
), ipid
);
2705 // Fall through and process it as part of the pool.
2709 if (ipid
> MAXIPPOOL
|| ipid
< 0)
2711 LOG(0, 0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
2713 session
[i
].ip_pool_index
= ipid
;
2717 ip_address_pool
[ipid
].assigned
= 1;
2718 ip_address_pool
[ipid
].session
= i
;
2719 ip_address_pool
[ipid
].last
= time_now
;
2720 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
2721 session
[i
].ip_pool_index
= ipid
;
2722 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
2727 // Fix the address pool to match a changed session.
2728 // (usually when the master sends us an update).
2729 void fix_address_pool(int sid
)
2733 ipid
= session
[sid
].ip_pool_index
;
2735 if (ipid
> ip_pool_size
)
2736 return; // Ignore it. rebuild_address_pool will fix it up.
2738 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
2739 return; // Just ignore it. rebuild_address_pool will take care of it.
2741 ip_address_pool
[ipid
].assigned
= 1;
2742 ip_address_pool
[ipid
].session
= sid
;
2743 ip_address_pool
[ipid
].last
= time_now
;
2744 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
2748 // Add a block of addresses to the IP pool to hand out.
2750 void add_to_ip_pool(u32 addr
, u32 mask
)
2754 mask
= 0xffffffff; // Host route only.
2758 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
2761 for (i
= addr
;(i
& mask
) == addr
; ++i
)
2763 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
2764 continue; // Skip 0 and broadcast addresses.
2766 ip_address_pool
[ip_pool_size
].address
= i
;
2767 ip_address_pool
[ip_pool_size
].assigned
= 0;
2769 if (ip_pool_size
>= MAXIPPOOL
)
2771 LOG(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr
)) );
2777 // Initialize the IP address pool
2783 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
2785 if (!(f
= fopen(IPPOOLFILE
, "r")))
2787 LOG(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
2791 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
2794 buf
[4095] = 0; // Force it to be zero terminated/
2796 if (*buf
== '#' || *buf
== '\n')
2797 continue; // Skip comments / blank lines
2798 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
2799 if ((p
= (char *)strchr(buf
, ':')))
2803 src
= inet_addr(buf
);
2804 if (src
== INADDR_NONE
)
2806 LOG(0, 0, 0, 0, "Invalid address pool IP %s\n", buf
);
2809 // This entry is for a specific IP only
2810 if (src
!= config
->bind_address
)
2815 if ((p
= (char *)strchr(pool
, '/')))
2819 u32 start
= 0, mask
= 0;
2821 LOG(2, 0, 0, 0, "Adding IP address range %s\n", buf
);
2823 if (!*p
|| !(numbits
= atoi(p
)))
2825 LOG(0, 0, 0, 0, "Invalid pool range %s\n", buf
);
2828 start
= ntohl(inet_addr(pool
));
2829 mask
= (u32
)(pow(2, numbits
) - 1) << (32 - numbits
);
2831 // Add a static route for this pool
2832 LOG(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start
)), 32 + mask
);
2833 routeset(0, start
, mask
, 0, 1);
2835 add_to_ip_pool(start
, mask
);
2839 // It's a single ip address
2840 add_to_ip_pool(inet_addr(pool
), 0);
2844 LOG(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
2847 void snoop_send_packet(char *packet
, u16 size
, ipt destination
, u16 port
)
2849 struct sockaddr_in snoop_addr
= {0};
2850 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
2853 snoop_addr
.sin_family
= AF_INET
;
2854 snoop_addr
.sin_addr
.s_addr
= destination
;
2855 snoop_addr
.sin_port
= ntohs(port
);
2857 LOG(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n",
2858 packet
, size
, inet_toa(snoop_addr
.sin_addr
.s_addr
), htons(snoop_addr
.sin_port
));
2859 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
2860 LOG(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
2861 STAT(packets_snooped
);
2864 void dump_acct_info()
2866 char filename
[1024];
2868 time_t t
= time(NULL
);
2873 CSTAT(call_dump_acct_info
);
2875 strftime(timestr
, 64, "%Y%m%d%H%M%S", localtime(&t
));
2876 snprintf(filename
, 1024, "%s/%s", config
->accounting_dir
, timestr
);
2878 for (i
= 0; i
< MAXSESSION
; i
++)
2880 if (!session
[i
].opened
|| !session
[i
].ip
|| !(session
[i
].cin
|| session
[i
].cout
) || !*session
[i
].user
|| session
[i
].walled_garden
)
2884 time_t now
= time(NULL
);
2885 if (!(f
= fopen(filename
, "w")))
2887 LOG(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
2890 LOG(3, 0, 0, 0, "Dumping accounting information to %s\n", filename
);
2891 fprintf(f
, "# dslwatch.pl dump file V1.01\n"
2895 "# format: username ip qos uptxoctets downrxoctets\n",
2901 LOG(4, 0, 0, 0, "Dumping accounting information for %s\n", session
[i
].user
);
2902 fprintf(f
, "%s %s %d %u %u\n",
2903 session
[i
].user
, // username
2904 inet_toa(htonl(session
[i
].ip
)), // ip
2905 (session
[i
].throttle_in
|| session
[i
].throttle_out
) ? 2 : 1, // qos
2906 (u32
)session
[i
].cin
, // uptxoctets
2907 (u32
)session
[i
].cout
); // downrxoctets
2909 session
[i
].pin
= session
[i
].cin
= 0;
2910 session
[i
].pout
= session
[i
].cout
= 0;
2918 int main(int argc
, char *argv
[])
2922 char *optconfig
= CONFIGFILE
;
2924 _program_name
= strdup(argv
[0]);
2926 time(&basetime
); // start clock
2929 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
2934 if (fork()) exit(0);
2936 freopen("/dev/null", "r", stdin
);
2937 freopen("/dev/null", "w", stdout
);
2938 freopen("/dev/null", "w", stderr
);
2947 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
2950 printf("Args are:\n"
2951 "\t-d\tDetach from terminal\n"
2952 "\t-c <file>\tConfig file\n"
2953 "\t-h <hostname>\tForce hostname\n"
2954 "\t-a <address>\tUse specific address\n"
2962 // Start the timer routine off
2964 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
2965 signal(SIGALRM
, sigalrm_handler
);
2966 siginterrupt(SIGALRM
, 0);
2969 initdata(optdebug
, optconfig
);
2973 init_tbf(config
->num_tbfs
);
2975 LOG(0, 0, 0, 0, "L2TPNS version " VERSION
"\n");
2976 LOG(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
2977 LOG(0, 0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
2980 rlim
.rlim_cur
= RLIM_INFINITY
;
2981 rlim
.rlim_max
= RLIM_INFINITY
;
2982 // Remove the maximum core size
2983 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
2984 LOG(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
2985 // Make core dumps go to /tmp
2989 if (config
->scheduler_fifo
)
2992 struct sched_param params
= {0};
2993 params
.sched_priority
= 1;
2995 if (get_nprocs() < 2)
2997 LOG(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
2998 config
->scheduler_fifo
= 0;
3002 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3004 LOG(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3008 LOG(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3009 config
->scheduler_fifo
= 0;
3014 /* Set up the cluster communications port. */
3015 if (cluster_init(config
->bind_address
) < 0)
3019 signal(SIGPIPE
, SIG_IGN
);
3020 bgp_setup(config
->as_number
);
3021 bgp_add_route(config
->bind_address
, 0xffffffff);
3022 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3024 if (config
->neighbour
[i
].name
[0])
3025 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3026 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3027 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3032 LOG(1, 0, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3040 signal(SIGHUP
, sighup_handler
);
3041 signal(SIGTERM
, sigterm_handler
);
3042 signal(SIGINT
, sigterm_handler
);
3043 signal(SIGQUIT
, sigquit_handler
);
3044 signal(SIGCHLD
, sigchild_handler
);
3046 // Prevent us from getting paged out
3047 if (config
->lock_pages
)
3049 if (!mlockall(MCL_CURRENT
))
3050 LOG(1, 0, 0, 0, "Locking pages into memory\n");
3052 LOG(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3057 // Drop privileges here
3058 if (config
->target_uid
> 0 && geteuid() == 0)
3059 setuid(config
->target_uid
);
3064 /* try to shut BGP down cleanly; with luck the sockets will be
3065 writable since we're out of the select */
3066 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3067 if (bgp_peers
[i
].state
== Established
)
3068 bgp_stop(&bgp_peers
[i
]);
3071 /* remove plugins (so cleanup code gets run) */
3074 // Remove the PID file if we wrote it
3075 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3076 unlink(config
->pid_file
);
3078 /* kill CLI children */
3079 signal(SIGTERM
, SIG_IGN
);
3084 void sighup_handler(int junk
)
3086 if (log_stream
&& log_stream
!= stderr
)
3095 void sigalrm_handler(int junk
)
3097 // Log current traffic stats
3099 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3100 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3101 (udp_rx
/ 1024.0 / 1024.0 * 8),
3102 (eth_tx
/ 1024.0 / 1024.0 * 8),
3103 (eth_rx
/ 1024.0 / 1024.0 * 8),
3104 (udp_tx
/ 1024.0 / 1024.0 * 8),
3105 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3106 udp_rx_pkt
, eth_rx_pkt
);
3108 udp_tx
= udp_rx
= 0;
3109 udp_rx_pkt
= eth_rx_pkt
= 0;
3110 eth_tx
= eth_rx
= 0;
3112 if (config
->dump_speed
)
3113 printf("%s\n", config
->bandwidth
);
3115 // Update the internal time counter
3117 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3122 struct param_timer p
= { time_now
};
3123 run_plugins(PLUGIN_TIMER
, &p
);
3128 void sigterm_handler(int junk
)
3130 LOG(1, 0, 0, 0, "Shutting down cleanly\n");
3131 if (config
->save_state
)
3137 void sigquit_handler(int junk
)
3141 LOG(1, 0, 0, 0, "Shutting down without saving sessions\n");
3142 for (i
= 1; i
< MAXSESSION
; i
++)
3144 if (session
[i
].opened
)
3145 sessionkill(i
, "L2TPNS Closing");
3147 for (i
= 1; i
< MAXTUNNEL
; i
++)
3149 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3150 tunnelshutdown(i
, "L2TPNS Closing");
3156 void sigchild_handler(int signal
)
3158 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3168 char magic
[sizeof(DUMP_MAGIC
) - 1];
3171 if (!config
->save_state
)
3177 if (stat(STATEFILE
, &sb
) < 0)
3183 if (sb
.st_mtime
< (time(NULL
) - 60))
3185 LOG(0, 0, 0, 0, "State file is too old to read, ignoring\n");
3190 f
= fopen(STATEFILE
, "r");
3195 LOG(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno
));
3199 if (fread(magic
, sizeof(magic
), 1, f
) != 1 || strncmp(magic
, DUMP_MAGIC
, sizeof(magic
)))
3201 LOG(0, 0, 0, 0, "Bad state file magic\n");
3205 LOG(1, 0, 0, 0, "Reading state information\n");
3206 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] > MAXIPPOOL
|| buf
[1] != sizeof(ippoolt
))
3208 LOG(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
3212 if (buf
[0] > ip_pool_size
)
3214 LOG(0, 0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf
[0], ip_pool_size
);
3218 LOG(2, 0, 0, 0, "Loading %u ip addresses\n", buf
[0]);
3219 for (i
= 0; i
< buf
[0]; i
++)
3221 if (fread(&itmp
, sizeof(itmp
), 1, f
) != 1)
3223 LOG(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i
, strerror(errno
));
3227 if (itmp
.address
!= ip_address_pool
[i
].address
)
3229 LOG(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i
);
3233 memcpy(&ip_address_pool
[i
], &itmp
, sizeof(itmp
));
3236 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXTUNNEL
|| buf
[1] != sizeof(tunnelt
))
3238 LOG(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
3242 LOG(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL
);
3243 if (fread(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3245 LOG(0, 0, 0, 0, "Error reading tunnel data from state file\n");
3249 for (i
= 0; i
< MAXTUNNEL
; i
++)
3251 tunnel
[i
].controlc
= 0;
3252 tunnel
[i
].controls
= NULL
;
3253 tunnel
[i
].controle
= NULL
;
3254 if (*tunnel
[i
].hostname
)
3255 LOG(3, 0, 0, 0, "Created tunnel for %s\n", tunnel
[i
].hostname
);
3258 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXSESSION
|| buf
[1] != sizeof(sessiont
))
3260 LOG(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
3264 LOG(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION
);
3265 if (fread(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3267 LOG(0, 0, 0, 0, "Error reading session data from state file\n");
3271 for (i
= 0; i
< MAXSESSION
; i
++)
3273 session
[i
].tbf_in
= 0;
3274 session
[i
].tbf_out
= 0;
3275 if (session
[i
].opened
)
3277 LOG(2, 0, i
, 0, "Loaded active session for user %s\n", session
[i
].user
);
3279 sessionsetup(session
[i
].tunnel
, i
);
3284 LOG(0, 0, 0, 0, "Loaded saved state information\n");
3292 if (!config
->save_state
)
3297 if (!(f
= fopen(STATEFILE
, "w")))
3300 LOG(1, 0, 0, 0, "Dumping state information\n");
3302 if (fwrite(DUMP_MAGIC
, sizeof(DUMP_MAGIC
) - 1, 1, f
) != 1)
3305 LOG(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size
);
3306 buf
[0] = ip_pool_size
;
3307 buf
[1] = sizeof(ippoolt
);
3308 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3310 if (fwrite(ip_address_pool
, sizeof(ippoolt
), ip_pool_size
, f
) != ip_pool_size
)
3313 LOG(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL
);
3315 buf
[1] = sizeof(tunnelt
);
3316 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3318 if (fwrite(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3321 LOG(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION
);
3322 buf
[0] = MAXSESSION
;
3323 buf
[1] = sizeof(sessiont
);
3324 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3326 if (fwrite(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3334 LOG(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno
));
3338 void build_chap_response(char *challenge
, u8 id
, u16 challenge_length
, char **challenge_response
)
3341 *challenge_response
= NULL
;
3343 if (!*config
->l2tpsecret
)
3345 LOG(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3349 LOG(4, 0, 0, 0, " Building challenge response for CHAP request\n");
3351 *challenge_response
= (char *)calloc(17, 1);
3354 MD5Update(&ctx
, &id
, 1);
3355 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3356 MD5Update(&ctx
, challenge
, challenge_length
);
3357 MD5Final(*challenge_response
, &ctx
);
3362 static int facility_value(char *name
)
3365 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3367 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3368 return facilitynames
[i
].c_val
;
3373 void update_config()
3376 static int timeout
= 0;
3377 static int interval
= 0;
3387 if (*config
->log_filename
)
3389 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3391 char *p
= config
->log_filename
+ 7;
3394 openlog("l2tpns", LOG_PID
, facility_value(p
));
3398 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
3400 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
3402 fseek(log_stream
, 0, SEEK_END
);
3403 setbuf(log_stream
, NULL
);
3407 log_stream
= stderr
;
3408 setbuf(log_stream
, NULL
);
3414 log_stream
= stderr
;
3415 setbuf(log_stream
, NULL
);
3420 config
->numradiusservers
= 0;
3421 for (i
= 0; i
< MAXRADSERVER
; i
++)
3422 if (config
->radiusserver
[i
])
3424 config
->numradiusservers
++;
3425 // Set radius port: if not set, take the port from the
3426 // first radius server. For the first radius server,
3427 // take the #defined default value from l2tpns.h
3429 // test twice, In case someone works with
3430 // a secondary radius server without defining
3431 // a primary one, this will work even then.
3432 if (i
>0 && !config
->radiusport
[i
])
3433 config
->radiusport
[i
] = config
->radiusport
[i
-1];
3434 if (!config
->radiusport
[i
])
3435 config
->radiusport
[i
] = RADPORT
;
3438 if (!config
->numradiusservers
)
3440 LOG(0, 0, 0, 0, "No RADIUS servers defined!\n");
3443 config
->num_radfds
= 2 << RADIUS_SHIFT
;
3446 for (i
= 0; i
< MAXPLUGINS
; i
++)
3448 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
3451 if (*config
->plugins
[i
])
3454 add_plugin(config
->plugins
[i
]);
3456 else if (*config
->old_plugins
[i
])
3459 remove_plugin(config
->old_plugins
[i
]);
3462 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
3463 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
3464 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
3465 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
3466 if (!*config
->cluster_interface
)
3467 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
3469 if (!config
->cluster_hb_interval
)
3470 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
3472 if (!config
->cluster_hb_timeout
)
3473 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
3475 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
3477 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
3478 // late, ensure we're sufficiently larger than that
3479 int t
= 4 * config
->cluster_hb_interval
+ 11;
3481 if (config
->cluster_hb_timeout
< t
)
3483 LOG(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
3484 config
->cluster_hb_timeout
= t
;
3487 // Push timing changes to the slaves immediately if we're the master
3488 if (config
->cluster_iam_master
)
3489 cluster_heartbeat();
3491 interval
= config
->cluster_hb_interval
;
3492 timeout
= config
->cluster_hb_timeout
;
3496 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
3499 if ((f
= fopen(config
->pid_file
, "w")))
3501 fprintf(f
, "%d\n", getpid());
3503 config
->wrote_pid
= 1;
3507 LOG(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
3511 config
->reload_config
= 0;
3514 void read_config_file()
3518 if (!config
->config_file
) return;
3519 if (!(f
= fopen(config
->config_file
, "r")))
3521 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
3525 LOG(3, 0, 0, 0, "Reading config file %s\n", config
->config_file
);
3527 LOG(3, 0, 0, 0, "Done reading config file\n");
3532 int sessionsetup(tunnelidt t
, sessionidt s
)
3534 // A session now exists, set it up
3540 CSTAT(call_sessionsetup
);
3542 LOG(3, session
[s
].ip
, s
, t
, "Doing session setup for session\n");
3544 if (!session
[s
].ip
|| session
[s
].ip
== 0xFFFFFFFE)
3546 assign_ip_address(s
);
3549 LOG(0, 0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
3550 sessionshutdown(s
, "No IP addresses available");
3553 LOG(3, 0, s
, t
, " No IP allocated. Assigned %s from pool\n",
3554 inet_toa(htonl(session
[s
].ip
)));
3558 // Make sure this is right
3559 session
[s
].tunnel
= t
;
3561 // zap old sessions with same IP and/or username
3562 // Don't kill gardened sessions - doing so leads to a DoS
3563 // from someone who doesn't need to know the password
3566 user
= session
[s
].user
;
3567 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3569 if (i
== s
) continue;
3570 if (ip
== session
[i
].ip
) sessionkill(i
, "Duplicate IP address");
3571 if (!session
[s
].walled_garden
&& !session
[i
].walled_garden
&& strcasecmp(user
, session
[i
].user
) == 0)
3572 sessionkill(i
, "Duplicate session for users");
3576 // Add the route for this session.
3578 // Static IPs need to be routed. Anything else
3579 // is part of the IP address pool and is already routed,
3580 // it just needs to be added to the IP cache.
3581 if (session
[s
].ip_pool_index
== -1) // static ip
3582 routeset(s
, session
[s
].ip
, 0, 0, 1);
3584 cache_ipmap(session
[s
].ip
, s
);
3586 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
3587 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, session
[s
].ip
, 1);
3589 if (!session
[s
].unique_id
)
3591 // did this session just finish radius?
3592 LOG(3, session
[s
].ip
, s
, t
, "Sending initial IPCP to client\n");
3594 session
[s
].unique_id
= ++last_id
;
3597 // Run the plugin's against this new session.
3599 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
3600 run_plugins(PLUGIN_NEW_SESSION
, &data
);
3603 // Allocate TBFs if throttled
3604 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
3605 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
3607 session
[s
].last_packet
= time_now
;
3610 char *sessionip
, *tunnelip
;
3611 sessionip
= strdup(inet_toa(htonl(session
[s
].ip
)));
3612 tunnelip
= strdup(inet_toa(htonl(tunnel
[t
].ip
)));
3613 LOG(2, session
[s
].ip
, s
, t
, "Login by %s at %s from %s (%s)\n",
3614 session
[s
].user
, sessionip
, tunnelip
, tunnel
[t
].hostname
);
3615 if (sessionip
) free(sessionip
);
3616 if (tunnelip
) free(tunnelip
);
3619 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
3621 return 1; // RADIUS OK and IP allocated, done...
3625 // This session just got dropped on us by the master or something.
3626 // Make sure our tables up up to date...
3628 int load_session(sessionidt s
, sessiont
*new)
3633 if (new->ip_pool_index
>= MAXIPPOOL
||
3634 new->tunnel
>= MAXTUNNEL
)
3636 LOG(0,0,s
,0, "Strange session update received!\n");
3637 // FIXME! What to do here?
3642 // Ok. All sanity checks passed. Now we're committed to
3643 // loading the new session.
3646 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
3649 if (new->ip
!= session
[s
].ip
) // Changed ip. fix up hash tables.
3651 if (session
[s
].ip
) // If there's an old one, remove it.
3653 // Remove any routes if the IP has changed
3654 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
3656 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, session
[s
].ip
, 0);
3657 session
[s
].route
[i
].ip
= 0;
3660 if (session
[s
].ip_pool_index
== -1) // static IP
3661 routeset(s
, session
[s
].ip
, 0, 0, 0);
3662 else // It's part of the IP pool, remove it manually.
3663 uncache_ipmap(session
[s
].ip
);
3668 // If there's a new one, add it.
3669 if (new->ip_pool_index
== -1)
3670 routeset(s
, new->ip
, 0, 0, 1);
3672 cache_ipmap(new->ip
, s
);
3676 // Update routed networks
3677 for (i
= 0; i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
3679 if (new->route
[i
].ip
== session
[s
].route
[i
].ip
&&
3680 new->route
[i
].mask
== session
[s
].route
[i
].mask
)
3683 if (session
[s
].route
[i
].ip
) // Remove the old one if it exists.
3684 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, session
[s
].ip
, 0);
3686 if (new->route
[i
].ip
) // Add the new one if it exists.
3687 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, new->ip
, 1);
3690 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
3691 // for walking the sessions to forward byte counts to the master.
3692 config
->cluster_highest_sessionid
= s
;
3694 // TEMP: old session struct used a u32 to define the throttle
3695 // speed for both up/down, new uses a u16 for each. Deal with
3696 // sessions from an old master for migration.
3697 if (new->throttle_out
== 0 && new->tbf_out
)
3698 new->throttle_out
= new->throttle_in
;
3700 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
3702 // Do fixups into address pool.
3703 if (new->ip_pool_index
!= -1)
3704 fix_address_pool(s
);
3710 void ringbuffer_dump(FILE *stream
)
3712 int i
= ringbuffer
->head
;
3714 while (i
!= ringbuffer
->tail
)
3716 if (*ringbuffer
->buffer
[i
].message
)
3717 fprintf(stream
, "%d-%s", ringbuffer
->buffer
[i
].level
, ringbuffer
->buffer
[i
].message
);
3718 if (++i
== ringbuffer
->tail
) break;
3719 if (i
== RINGBUFFER_SIZE
) i
= 0;
3728 loaded_plugins
= ll_init();
3729 // Initialize the plugins to nothing
3730 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
3731 plugins
[i
] = ll_init();
3734 static void *open_plugin(char *plugin_name
, int load
)
3736 char path
[256] = "";
3738 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
3739 LOG(2, 0, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
3740 return dlopen(path
, RTLD_NOW
);
3743 // plugin callback to get a config value
3744 static void *getconfig(char *key
, enum config_typet type
)
3748 for (i
= 0; config_values
[i
].key
; i
++)
3750 if (!strcmp(config_values
[i
].key
, key
))
3752 if (config_values
[i
].type
== type
)
3753 return ((void *) config
) + config_values
[i
].offset
;
3755 LOG(1, 0, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
3756 key
, type
, config_values
[i
].type
);
3762 LOG(1, 0, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
3766 void add_plugin(char *plugin_name
)
3768 static struct pluginfuncs funcs
= {
3773 sessiontbysessionidt
,
3774 sessionidtbysessiont
,
3781 void *p
= open_plugin(plugin_name
, 1);
3782 int (*initfunc
)(struct pluginfuncs
*);
3787 LOG(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror());
3791 if (ll_contains(loaded_plugins
, p
))
3798 int *v
= dlsym(p
, "__plugin_api_version");
3799 if (!v
|| *v
!= PLUGIN_API_VERSION
)
3801 LOG(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
3807 if ((initfunc
= dlsym(p
, "plugin_init")))
3809 if (!initfunc(&funcs
))
3811 LOG(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
3817 ll_push(loaded_plugins
, p
);
3819 for (i
= 0; i
< max_plugin_functions
; i
++)
3822 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
3824 LOG(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
3825 ll_push(plugins
[i
], x
);
3829 LOG(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name
);
3832 static void run_plugin_done(void *plugin
)
3834 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
3840 void remove_plugin(char *plugin_name
)
3842 void *p
= open_plugin(plugin_name
, 0);
3848 for (i
= 0; i
< max_plugin_functions
; i
++)
3851 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
3852 ll_delete(plugins
[i
], x
);
3855 if (ll_contains(loaded_plugins
, p
))
3857 ll_delete(loaded_plugins
, p
);
3862 LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name
);
3865 int run_plugins(int plugin_type
, void *data
)
3867 int (*func
)(void *data
);
3868 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
) return 1;
3870 ll_reset(plugins
[plugin_type
]);
3871 while ((func
= ll_next(plugins
[plugin_type
])))
3875 if (rc
== PLUGIN_RET_STOP
) return 1;
3876 if (rc
== PLUGIN_RET_ERROR
) return 0;
3885 ll_reset(loaded_plugins
);
3886 while ((p
= ll_next(loaded_plugins
)))
3890 void processcontrol(u8
* buf
, int len
, struct sockaddr_in
*addr
)
3894 struct param_control param
= { buf
, len
, ntohl(addr
->sin_addr
.s_addr
), ntohs(addr
->sin_port
), NULL
, 0, 0 };
3897 if (log_stream
&& config
->debug
>= 4)
3899 LOG(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Received ");
3900 dump_packet(buf
, log_stream
);
3903 resp
= calloc(1400, 1);
3904 l
= new_packet(PKT_RESP_ERROR
, resp
);
3905 *(int *)(resp
+ 6) = *(int *)(buf
+ 6);
3907 param
.type
= ntohs(*(short *)(buf
+ 2));
3908 param
.id
= ntohl(*(int *)(buf
+ 6));
3909 param
.data_length
= ntohs(*(short *)(buf
+ 4)) - 10;
3910 param
.data
= (param
.data_length
> 0) ? (char *)(buf
+ 10) : NULL
;
3911 param
.response
= resp
;
3912 param
.response_length
= l
;
3914 run_plugins(PLUGIN_CONTROL
, ¶m
);
3916 if (param
.send_response
)
3918 send_packet(controlfd
, ntohl(addr
->sin_addr
.s_addr
), ntohs(addr
->sin_port
), param
.response
, param
.response_length
);
3919 LOG(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Sent Control packet response\n");
3925 void tunnelclear(tunnelidt t
)
3928 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
3929 tunnel
[t
].state
= TUNNELFREE
;
3932 tunnelidt
new_tunnel()
3935 for (i
= 1; i
< MAXTUNNEL
; i
++)
3937 if (tunnel
[i
].state
== TUNNELFREE
)
3939 LOG(4, 0, 0, i
, "Assigning tunnel ID %d\n", i
);
3940 if (i
> config
->cluster_highest_tunnelid
)
3941 config
->cluster_highest_tunnelid
= i
;
3945 LOG(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
3950 // We're becoming the master. Do any required setup..
3952 // This is principally telling all the plugins that we're
3953 // now a master, and telling them about all the sessions
3954 // that are active too..
3956 void become_master(void)
3959 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
3961 // running a bunch of iptables commands is slow and can cause
3962 // the master to drop tunnels on takeover--kludge around the
3963 // problem by forking for the moment (note: race)
3964 if (!fork_and_close())
3966 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
3968 if (!session
[s
].tunnel
) // Not an in-use session.
3971 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
3977 for (i
= 0; i
< config
->num_radfds
; i
++)
3979 if (!radfds
[i
]) continue;
3980 FD_SET(radfds
[i
], &readset
);
3981 if (radfds
[i
] > readset_n
)
3982 readset_n
= radfds
[i
];
3986 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
3992 if (CLI_HELP_REQUESTED
)
3993 return CLI_HELP_NO_ARGS
;
3996 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
3998 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4001 if (!session
[s
].tunnel
)
4004 idle
= time_now
- session
[s
].last_packet
;
4005 idle
/= 5 ; // In multiples of 5 seconds.
4015 for (i
= 0; i
< 63; ++i
)
4017 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4019 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4020 cli_print(cli
, "%d total sessions open.", count
);
4024 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4030 if (CLI_HELP_REQUESTED
)
4031 return CLI_HELP_NO_ARGS
;
4034 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4036 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4039 if (!session
[s
].tunnel
)
4042 d
= time_now
- session
[s
].opened
;
4045 while (d
> 1 && open
< 32)
4055 for (i
= 0; i
< 30; ++i
)
4057 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4060 cli_print(cli
, "%d total sessions open.", count
);
4066 * This unencodes the AVP using the L2TP CHAP secret and the
4067 * previously stored random vector. It replaces the hidden data with
4068 * the cleartext data and returns the length of the cleartext data
4069 * (including the AVP "header" of 6 bytes).
4071 * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
4073 int unhide_avp(u8
*avp
, tunnelidt t
, sessionidt s
, u16 length
)
4078 u8 working_vector
[16];
4079 uint16_t hidden_length
;
4084 // Find the AVP type.
4085 type
[0] = *(avp
+ 4);
4086 type
[1] = *(avp
+ 5);
4088 // Line up with the hidden data
4089 cursor
= output
= avp
+ 6;
4091 // Compute initial pad
4093 MD5Update(&ctx
, type
, 2);
4094 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4095 MD5Update(&ctx
, session
[s
].random_vector
, session
[s
].random_vector_length
);
4096 MD5Final(digest
, &ctx
);
4098 // Get hidden length
4099 hidden_length
= ((uint16_t) (digest
[0] ^ cursor
[0])) * 256 + (uint16_t) (digest
[1] ^ cursor
[1]);
4101 // Keep these for later use
4102 working_vector
[0] = *cursor
;
4103 working_vector
[1] = *(cursor
+ 1);
4106 if (hidden_length
> length
- 8)
4108 LOG(1, 0, s
, t
, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length
, (int) length
);
4112 /* Decrypt remainder */
4114 todo
= hidden_length
;
4117 working_vector
[done
] = *cursor
;
4118 *output
= digest
[done
] ^ *cursor
;
4123 if (done
== 16 && todo
)
4125 // Compute new digest
4128 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4129 MD5Update(&ctx
, &working_vector
, 16);
4130 MD5Final(digest
, &ctx
);
4134 return hidden_length
+ 6;