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 1.59 2004-11-28 20:10:04 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 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 clifd
= -1; // Socket listening for CLI connections.
62 int snoopfd
= -1; // UDP file handle for sending out intercept data
63 int *radfds
= NULL
; // RADIUS requests file handles
64 int ifrfd
= -1; // File descriptor for routing, etc
65 time_t basetime
= 0; // base clock
66 char hostname
[1000] = ""; // us.
67 static u32 sessionid
= 0; // session id for radius accounting
68 static int syslog_log
= 0; // are we logging to syslog
69 static 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
73 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
74 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
76 static void *ip_hash
[256]; // Mapping from IP address to session structures.
79 static u32 udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
80 static u32 eth_rx
= 0, eth_rx_pkt
= 0;
83 static u32 ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
84 time_t time_now
= 0; // Current time in seconds since epoch.
85 static char time_now_string
[64] = {0}; // Current time as a string.
86 static char main_quit
= 0; // True if we're in the process of exiting.
87 linked_list
*loaded_plugins
;
88 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
90 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
91 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
93 config_descriptt config_values
[] = {
94 CONFIG("debug", debug
, INT
),
95 CONFIG("log_file", log_filename
, STRING
),
96 CONFIG("pid_file", pid_file
, STRING
),
97 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
98 CONFIG("primary_dns", default_dns1
, IP
),
99 CONFIG("secondary_dns", default_dns2
, IP
),
100 CONFIG("save_state", save_state
, BOOL
),
101 CONFIG("primary_radius", radiusserver
[0], IP
),
102 CONFIG("secondary_radius", radiusserver
[1], IP
),
103 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
104 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
105 CONFIG("radius_accounting", radius_accounting
, BOOL
),
106 CONFIG("radius_secret", radiussecret
, STRING
),
107 CONFIG("bind_address", bind_address
, IP
),
108 CONFIG("peer_address", peer_address
, IP
),
109 CONFIG("send_garp", send_garp
, BOOL
),
110 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
111 CONFIG("throttle_buckets", num_tbfs
, INT
),
112 CONFIG("accounting_dir", accounting_dir
, STRING
),
113 CONFIG("setuid", target_uid
, INT
),
114 CONFIG("dump_speed", dump_speed
, BOOL
),
115 CONFIG("cleanup_interval", cleanup_interval
, INT
),
116 CONFIG("multi_read_count", multi_read_count
, INT
),
117 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
118 CONFIG("lock_pages", lock_pages
, BOOL
),
119 CONFIG("icmp_rate", icmp_rate
, INT
),
120 CONFIG("cluster_address", cluster_address
, IP
),
121 CONFIG("cluster_interface", cluster_interface
, STRING
),
122 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
123 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
127 static char *plugin_functions
[] = {
134 "plugin_new_session",
135 "plugin_kill_session",
137 "plugin_radius_response",
138 "plugin_become_master",
139 "plugin_new_session_master",
142 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
144 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
145 sessiont
*session
= NULL
; // Array of session structures.
146 sessioncountt
*sess_count
= NULL
; // Array of partial per-session traffic counters.
147 radiust
*radius
= NULL
; // Array of radius structures.
148 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
149 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
150 static controlt
*controlfree
= 0;
151 struct Tstats
*_statistics
= NULL
;
153 struct Tringbuffer
*ringbuffer
= NULL
;
156 static void cache_ipmap(ipt ip
, int s
);
157 static void uncache_ipmap(ipt ip
);
158 static void free_ip_address(sessionidt s
);
159 static void dump_acct_info(void);
160 static void sighup_handler(int sig
);
161 static void sigalrm_handler(int sig
);
162 static void sigterm_handler(int sig
);
163 static void sigquit_handler(int sig
);
164 static void sigchild_handler(int sig
);
165 static void read_state(void);
166 static void dump_state(void);
167 static void build_chap_response(char *challenge
, u8 id
, u16 challenge_length
, char **challenge_response
);
168 static void update_config(void);
169 static void read_config_file(void);
170 static void initplugins(void);
171 static int add_plugin(char *plugin_name
);
172 static int remove_plugin(char *plugin_name
);
173 static void plugins_done(void);
174 static void processcontrol(u8
* buf
, int len
, struct sockaddr_in
*addr
, int alen
);
175 static tunnelidt
new_tunnel(void);
176 static int unhide_avp(u8
*avp
, tunnelidt t
, sessionidt s
, u16 length
);
178 // return internal time (10ths since process startup)
179 static clockt
now(void)
183 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
186 // work out a retry time based on try number
187 // This is a straight bounded exponential backoff.
188 // Maximum re-try time is 32 seconds. (2^5).
189 clockt
backoff(u8
try)
191 if (try > 5) try = 5; // max backoff
192 return now() + 10 * (1 << try);
197 // Log a debug message. Typically called vias LOG macro
199 void _log(int level
, ipt address
, sessionidt s
, tunnelidt t
, const char *format
, ...)
201 static char message
[65536] = {0};
202 static char message2
[65536] = {0};
208 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
209 ringbuffer
->tail
= 0;
210 if (ringbuffer
->tail
== ringbuffer
->head
)
211 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
212 ringbuffer
->head
= 0;
214 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
215 ringbuffer
->buffer
[ringbuffer
->tail
].address
= address
;
216 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
217 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
218 va_start(ap
, format
);
219 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
224 if (config
->debug
< level
) return;
226 va_start(ap
, format
);
229 vsnprintf(message2
, 65535, format
, ap
);
230 snprintf(message
, 65535, "%s %02d/%02d %s", time_now_string
, t
, s
, message2
);
231 fprintf(log_stream
, "%s", message
);
235 vsnprintf(message2
, 65535, format
, ap
);
236 snprintf(message
, 65535, "%02d/%02d %s", t
, s
, message2
);
237 syslog(level
+ 2, message
); // We don't need LOG_EMERG or LOG_ALERT
242 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
245 const u8
*d
= (const u8
*)data
;
247 if (config
->debug
< level
) return;
249 // No support for _log_hex to syslog
252 _log(level
, 0, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
253 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
255 for (i
= 0; i
< maxsize
; )
257 fprintf(log_stream
, "%4X: ", i
);
258 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
260 fprintf(log_stream
, "%02X ", d
[j
]);
262 fputs(": ", log_stream
);
265 for (; j
< i
+ 16; j
++)
267 fputs(" ", log_stream
);
269 fputs(": ", log_stream
);
272 fputs(" ", log_stream
);
273 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
275 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
276 fputc(d
[j
], log_stream
);
278 fputc('.', log_stream
);
281 fputs(" ", log_stream
);
285 fputs("\n", log_stream
);
289 setbuf(log_stream
, NULL
);
296 // This adds it to the routing table, advertises it
297 // via BGP if enabled, and stuffs it into the
298 // 'sessionbyip' cache.
300 // 'ip' and 'mask' must be in _host_ order.
302 static void routeset(sessionidt s
, ipt ip
, ipt mask
, ipt gw
, u8 add
)
307 if (!mask
) mask
= 0xffffffff;
309 ip
&= mask
; // Force the ip to be the first one in the route.
311 memset(&r
, 0, sizeof(r
));
312 r
.rt_dev
= config
->tundevice
;
313 r
.rt_dst
.sa_family
= AF_INET
;
314 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
315 r
.rt_gateway
.sa_family
= AF_INET
;
316 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
317 r
.rt_genmask
.sa_family
= AF_INET
;
318 *(u32
*) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
319 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
321 r
.rt_flags
|= RTF_GATEWAY
;
322 else if (mask
== 0xffffffff)
323 r
.rt_flags
|= RTF_HOST
;
325 LOG(1, ip
, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n",
327 ip
>> 24, ip
>> 16 & 0xff, ip
>> 8 & 0xff, ip
& 0xff,
328 mask
>> 24, mask
>> 16 & 0xff, mask
>> 8 & 0xff, mask
& 0xff,
329 gw
>> 24, gw
>> 16 & 0xff, gw
>> 8 & 0xff, gw
& 0xff);
331 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
332 LOG(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
336 bgp_add_route(htonl(ip
), htonl(mask
));
338 bgp_del_route(htonl(ip
), htonl(mask
));
341 // Add/Remove the IPs to the 'sessionbyip' cache.
342 // Note that we add the zero address in the case of
343 // a network route. Roll on CIDR.
345 // Note that 's == 0' implies this is the address pool.
346 // We still cache it here, because it will pre-fill
347 // the malloc'ed tree.
351 if (!add
) // Are we deleting a route?
352 s
= 0; // Caching the session as '0' is the same as uncaching.
354 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
360 // Set up TUN interface
361 static void inittun(void)
364 struct sockaddr_in sin
= {0};
365 memset(&ifr
, 0, sizeof(ifr
));
366 ifr
.ifr_flags
= IFF_TUN
;
368 tunfd
= open(TUNDEVICE
, O_RDWR
);
371 LOG(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
375 int flags
= fcntl(tunfd
, F_GETFL
, 0);
376 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
378 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
380 LOG(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
383 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
384 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
385 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
387 sin
.sin_family
= AF_INET
;
388 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
389 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
391 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
393 LOG(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
396 /* Bump up the qlen to deal with bursts from the network */
398 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
400 LOG(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
403 ifr
.ifr_flags
= IFF_UP
;
404 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
406 LOG(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
412 static void initudp(void)
415 struct sockaddr_in addr
;
418 memset(&addr
, 0, sizeof(addr
));
419 addr
.sin_family
= AF_INET
;
420 addr
.sin_port
= htons(L2TPPORT
);
421 addr
.sin_addr
.s_addr
= config
->bind_address
;
422 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
423 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
425 int flags
= fcntl(udpfd
, F_GETFL
, 0);
426 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
428 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
430 LOG(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
433 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
436 memset(&addr
, 0, sizeof(addr
));
437 addr
.sin_family
= AF_INET
;
438 addr
.sin_port
= htons(NSCTL_PORT
);
439 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
440 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
441 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
443 LOG(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
449 // Find session by IP, < 1 for not found
451 // Confusingly enough, this 'ip' must be
452 // in _network_ order. This being the common
453 // case when looking it up from IP packet headers.
455 // We actually use this cache for two things.
456 // #1. For used IP addresses, this maps to the
457 // session ID that it's used by.
458 // #2. For un-used IP addresses, this maps to the
459 // index into the pool table that contains that
463 static int lookup_ipmap(ipt ip
)
466 char **d
= (char **) ip_hash
;
469 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
470 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
471 if (!(d
= (char **) d
[(size_t) *a
++])) return 0;
473 s
= (ipt
) d
[(size_t) *a
];
477 sessionidt
sessionbyip(ipt ip
)
479 int s
= lookup_ipmap(ip
);
480 CSTAT(call_sessionbyip
);
482 if (s
> 0 && s
< MAXSESSION
&& session
[s
].tunnel
)
488 // Take an IP address in HOST byte order and
489 // add it to the sessionid by IP cache.
491 // (It's actually cached in network order)
493 static void cache_ipmap(ipt ip
, int s
)
495 ipt nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0]
497 char **d
= (char **) ip_hash
;
500 for (i
= 0; i
< 3; i
++)
502 if (!d
[(size_t) a
[i
]])
504 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof (void *))))
508 d
= (char **) d
[(size_t) a
[i
]];
511 d
[(size_t) a
[3]] = (char *)((int)s
);
514 LOG(4, ip
, s
, session
[s
].tunnel
, "Caching ip address %s\n", inet_toa(nip
));
516 LOG(4, ip
, 0, 0, "Un-caching ip address %s\n", inet_toa(nip
));
517 // else a map to an ip pool index.
520 static void uncache_ipmap(ipt ip
)
522 cache_ipmap(ip
, 0); // Assign it to the NULL session.
526 // CLI list to dump current ipcache.
528 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
530 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
534 if (CLI_HELP_REQUESTED
)
535 return CLI_HELP_NO_ARGS
;
537 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
539 for (i
= 0; i
< 256; ++i
)
544 for (j
= 0; j
< 256; ++j
)
549 for (k
= 0; k
< 256; ++k
)
554 for (l
= 0; l
< 256; ++l
)
558 cli_print(cli
, "%7d %d.%d.%d.%d", (int) g
[l
], i
, j
, k
, l
);
564 cli_print(cli
, "%d entries in cache", count
);
569 // Find session by username, 0 for not found
570 // walled garden users aren't authenticated, so the username is
571 // reasonably useless. Ignore them to avoid incorrect actions
573 // This is VERY inefficent. Don't call it often. :)
575 sessionidt
sessionbyuser(char *username
)
578 CSTAT(call_sessionbyuser
);
580 for (s
= 1; s
< MAXSESSION
; ++s
)
582 if (session
[s
].walled_garden
)
583 continue; // Skip walled garden users.
585 if (!strncmp(session
[s
].user
, username
, 128))
589 return 0; // Not found.
592 void send_garp(ipt ip
)
598 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
601 LOG(0, 0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
604 memset(&ifr
, 0, sizeof(ifr
));
605 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
606 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
608 LOG(0, 0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
612 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
613 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
615 LOG(0, 0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
620 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
623 // Find session by username, 0 for not found
624 static sessiont
*sessiontbysessionidt(sessionidt s
)
626 if (!s
|| s
> MAXSESSION
) return NULL
;
630 static sessionidt
sessionidtbysessiont(sessiont
*s
)
632 sessionidt val
= s
-session
;
633 if (s
< session
|| val
> MAXSESSION
) return 0;
637 // actually send a control message for a specific tunnel
638 void tunnelsend(u8
* buf
, u16 l
, tunnelidt t
)
640 struct sockaddr_in addr
;
642 CSTAT(call_tunnelsend
);
646 static int backtrace_count
= 0;
647 LOG(0, 0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
648 STAT(tunnel_tx_errors
);
649 log_backtrace(backtrace_count
, 5)
655 static int backtrace_count
= 0;
656 LOG(1, 0, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
657 log_backtrace(backtrace_count
, 5)
658 STAT(tunnel_tx_errors
);
662 memset(&addr
, 0, sizeof(addr
));
663 addr
.sin_family
= AF_INET
;
664 *(u32
*) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
665 addr
.sin_port
= htons(tunnel
[t
].port
);
667 // sequence expected, if sequence in message
668 if (*buf
& 0x08) *(u16
*) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
670 // If this is a control message, deal with retries
673 tunnel
[t
].last
= time_now
; // control message sent
674 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
675 if (tunnel
[t
].try > 1)
677 STAT(tunnel_retries
);
678 LOG(3, tunnel
[t
].ip
, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
682 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
684 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",
685 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
686 STAT(tunnel_tx_errors
);
690 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
691 STAT(tunnel_tx_packets
);
692 INC_STAT(tunnel_tx_bytes
, l
);
696 // Tiny helper function to write data to
699 int tun_write(u8
* data
, int size
)
701 return write(tunfd
, data
, size
);
704 // process outgoing (to tunnel) IP
706 static void processipout(u8
* buf
, int len
)
713 char * data
= buf
; // Keep a copy of the originals.
718 CSTAT(call_processipout
);
720 if (len
< MIN_IP_SIZE
)
722 LOG(1, 0, 0, 0, "Short IP, %d bytes\n", len
);
723 STAT(tunnel_tx_errors
);
728 LOG(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len
);
729 STAT(tunnel_tx_errors
);
733 // Skip the tun header
737 // Got an IP header now
738 if (*(u8
*)(buf
) >> 4 != 4)
740 LOG(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
744 ip
= *(u32
*)(buf
+ 16);
745 if (!(s
= sessionbyip(ip
)))
747 // Is this a packet for a session that doesn't exist?
748 static int rate
= 0; // Number of ICMP packets we've sent this second.
749 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
751 if (last
!= time_now
)
757 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
759 LOG(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32
*)(buf
+ 12)));
760 host_unreachable(*(u32
*)(buf
+ 12), *(u16
*)(buf
+ 4), ip
, buf
, (len
< 64) ? 64 : len
);
764 t
= session
[s
].tunnel
;
767 // run access-list if any
768 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
773 // Are we throttling this session?
774 if (config
->cluster_iam_master
)
775 tbf_queue_packet(sp
->tbf_out
, data
, size
);
777 master_throttle_packet(sp
->tbf_out
, data
, size
);
780 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
782 // We are walled-gardening this
783 master_garden_packet(s
, data
, size
);
787 LOG(5, session
[s
].ip
, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
789 // Add on L2TP header
791 u8
*p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
793 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
796 // Snooping this session, send it to intercept box
797 if (sp
->snoop_ip
&& sp
->snoop_port
)
798 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
800 sp
->cout
+= len
; // byte count
801 sp
->total_cout
+= len
; // byte count
804 sess_count
[s
].cout
+= len
; // To send to master..
808 // Helper routine for the TBF filters.
809 // Used to send queued data in to the user!
811 static void send_ipout(sessionidt s
, u8
*buf
, int len
)
819 if (len
< 0 || len
> MAXETHER
)
821 LOG(1,0,0,0, "Odd size IP packet: %d bytes\n", len
);
825 // Skip the tun header
829 ip
= *(u32
*)(buf
+ 16);
834 t
= session
[s
].tunnel
;
837 LOG(5, session
[s
].ip
, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
839 // Add on L2TP header
841 u8
*p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
843 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
846 // Snooping this session.
847 if (sp
->snoop_ip
&& sp
->snoop_port
)
848 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
850 sp
->cout
+= len
; // byte count
851 sp
->total_cout
+= len
; // byte count
854 sess_count
[s
].cout
+= len
; // To send to master..
857 // add an AVP (16 bit)
858 static void control16(controlt
* c
, u16 avp
, u16 val
, u8 m
)
860 u16 l
= (m
? 0x8008 : 0x0008);
861 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
862 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
863 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
864 *(u16
*) (c
->buf
+ c
->length
+ 6) = htons(val
);
868 // add an AVP (32 bit)
869 static void control32(controlt
* c
, u16 avp
, u32 val
, u8 m
)
871 u16 l
= (m
? 0x800A : 0x000A);
872 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
873 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
874 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
875 *(u32
*) (c
->buf
+ c
->length
+ 6) = htonl(val
);
879 // add an AVP (32 bit)
880 static void controls(controlt
* c
, u16 avp
, char *val
, u8 m
)
882 u16 l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
883 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
884 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
885 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
886 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
887 c
->length
+= 6 + strlen(val
);
891 static void controlb(controlt
* c
, u16 avp
, char *val
, unsigned int len
, u8 m
)
893 u16 l
= ((m
? 0x8000 : 0) + len
+ 6);
894 *(u16
*) (c
->buf
+ c
->length
+ 0) = htons(l
);
895 *(u16
*) (c
->buf
+ c
->length
+ 2) = htons(0);
896 *(u16
*) (c
->buf
+ c
->length
+ 4) = htons(avp
);
897 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
898 c
->length
+= 6 + len
;
901 // new control connection
902 static controlt
*controlnew(u16 mtype
)
906 c
= malloc(sizeof(controlt
));
910 controlfree
= c
->next
;
914 *(u16
*) (c
->buf
+ 0) = htons(0xC802); // flags/ver
916 control16(c
, 0, mtype
, 1);
920 // send zero block if nothing is waiting
922 static void controlnull(tunnelidt t
)
925 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
928 *(u16
*) (buf
+ 0) = htons(0xC802); // flags/ver
929 *(u16
*) (buf
+ 2) = htons(12); // length
930 *(u16
*) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
931 *(u16
*) (buf
+ 6) = htons(0); // session
932 *(u16
*) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
933 *(u16
*) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
934 tunnelsend(buf
, 12, t
);
937 // add a control message to a tunnel, and send if within window
938 static void controladd(controlt
* c
, tunnelidt t
, sessionidt s
)
940 *(u16
*) (c
->buf
+ 2) = htons(c
->length
); // length
941 *(u16
*) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
942 *(u16
*) (c
->buf
+ 6) = htons(s
? session
[s
].far
: 0); // session
943 *(u16
*) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
944 tunnel
[t
].ns
++; // advance sequence
945 // link in message in to queue
946 if (tunnel
[t
].controlc
)
947 tunnel
[t
].controle
->next
= c
;
949 tunnel
[t
].controls
= c
;
951 tunnel
[t
].controle
= c
;
952 tunnel
[t
].controlc
++;
954 // send now if space in window
955 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
957 tunnel
[t
].try = 0; // first send
958 tunnelsend(c
->buf
, c
->length
, t
);
963 // Throttle or Unthrottle a session
965 // Throttle the data from/to through a session to no more than
966 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
969 // If either value is -1, the current value is retained for that
972 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
974 if (!session
[s
].tunnel
)
975 return; // No-one home.
977 if (!*session
[s
].user
)
978 return; // User not logged in
982 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
983 if (session
[s
].tbf_in
)
984 free_tbf(session
[s
].tbf_in
);
987 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
989 session
[s
].tbf_in
= 0;
991 session
[s
].throttle_in
= rate_in
;
996 int bytes
= rate_out
* 1024 / 8;
997 if (session
[s
].tbf_out
)
998 free_tbf(session
[s
].tbf_out
);
1001 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1003 session
[s
].tbf_out
= 0;
1005 session
[s
].throttle_out
= rate_out
;
1009 // add/remove filters from session (-1 = no change)
1010 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1012 if (!session
[s
].tunnel
)
1013 return; // No-one home.
1015 if (!*session
[s
].user
)
1016 return; // User not logged in
1019 if (filter_in
> MAXFILTER
) filter_in
= -1;
1020 if (filter_out
> MAXFILTER
) filter_out
= -1;
1021 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1022 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1026 if (session
[s
].filter_in
)
1027 ip_filters
[session
[s
].filter_in
- 1].used
--;
1030 ip_filters
[filter_in
- 1].used
++;
1032 session
[s
].filter_in
= filter_in
;
1035 if (filter_out
>= 0)
1037 if (session
[s
].filter_out
)
1038 ip_filters
[session
[s
].filter_out
- 1].used
--;
1041 ip_filters
[filter_out
- 1].used
++;
1043 session
[s
].filter_out
= filter_out
;
1047 // start tidy shutdown of session
1048 void sessionshutdown(sessionidt s
, char *reason
)
1050 int walled_garden
= session
[s
].walled_garden
;
1053 CSTAT(call_sessionshutdown
);
1055 if (!session
[s
].tunnel
)
1057 LOG(3, session
[s
].ip
, s
, session
[s
].tunnel
, "Called sessionshutdown on a session with no tunnel.\n");
1058 return; // not a live session
1061 if (!session
[s
].die
)
1063 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1064 LOG(2, 0, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1065 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1068 // RADIUS Stop message
1069 if (session
[s
].opened
&& !walled_garden
&& !session
[s
].die
)
1071 u16 r
= session
[s
].radius
;
1074 if (!(r
= radiusnew(s
)))
1076 LOG(1, 0, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1077 STAT(radius_overflow
);
1082 for (n
= 0; n
< 15; n
++)
1083 radius
[r
].auth
[n
] = rand();
1086 if (r
&& radius
[r
].state
!= RADIUSSTOP
)
1087 radiussend(r
, RADIUSSTOP
); // stop, if not already trying
1091 { // IP allocated, clear and unroute
1094 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1096 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1097 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1100 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1101 session
[s
].route
[r
].ip
= 0;
1104 if (session
[s
].ip_pool_index
== -1) // static ip
1106 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1113 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1114 throttle_session(s
, 0, 0);
1117 controlt
*c
= controlnew(14); // sending CDN
1118 control16(c
, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message
1119 control16(c
, 14, s
, 1); // assigned session (our end)
1120 controladd(c
, session
[s
].tunnel
, s
); // send the message
1123 if (!session
[s
].die
)
1124 session
[s
].die
= now() + 150; // Clean up in 15 seconds
1126 // update filter refcounts
1127 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1128 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1130 cluster_send_session(s
);
1133 void sendipcp(tunnelidt t
, sessionidt s
)
1136 u16 r
= session
[s
].radius
;
1139 CSTAT(call_sendipcp
);
1144 if (radius
[r
].state
!= RADIUSIPCP
)
1146 radius
[r
].state
= RADIUSIPCP
;
1150 radius
[r
].retry
= backoff(radius
[r
].try++);
1151 if (radius
[r
].try > 10)
1153 radiusclear(r
, s
); // Clear radius session.
1154 sessionshutdown(s
, "No reply on IPCP");
1158 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1162 q
[1] = r
<< RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1163 *(u16
*) (q
+ 2) = htons(10);
1166 *(u32
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1167 config
->bind_address
? config
->bind_address
:
1168 my_address
; // send my IP
1170 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1171 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1174 // kill a session now
1175 static void sessionkill(sessionidt s
, char *reason
)
1178 CSTAT(call_sessionkill
);
1180 session
[s
].die
= now();
1181 sessionshutdown(s
, reason
); // close radius/routes, etc.
1182 if (session
[s
].radius
)
1183 radiusclear(session
[s
].radius
, s
); // cant send clean accounting data, session is killed
1185 LOG(2, 0, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1187 memset(&session
[s
], 0, sizeof(session
[s
]));
1188 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1189 session
[s
].next
= sessionfree
;
1191 cli_session_actions
[s
].action
= 0;
1192 cluster_send_session(s
);
1195 static void tunnelclear(tunnelidt t
)
1198 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1199 tunnel
[t
].state
= TUNNELFREE
;
1202 // kill a tunnel now
1203 static void tunnelkill(tunnelidt t
, char *reason
)
1208 CSTAT(call_tunnelkill
);
1210 tunnel
[t
].state
= TUNNELDIE
;
1212 // free control messages
1213 while ((c
= tunnel
[t
].controls
))
1215 controlt
* n
= c
->next
;
1216 tunnel
[t
].controls
= n
;
1217 tunnel
[t
].controlc
--;
1218 c
->next
= controlfree
;
1222 for (s
= 1; s
< MAXSESSION
; s
++)
1223 if (session
[s
].tunnel
== t
)
1224 sessionkill(s
, reason
);
1228 LOG(1, 0, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1229 cli_tunnel_actions
[s
].action
= 0;
1230 cluster_send_tunnel(t
);
1233 // shut down a tunnel cleanly
1234 static void tunnelshutdown(tunnelidt t
, char *reason
)
1238 CSTAT(call_tunnelshutdown
);
1240 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1242 // never set up, can immediately kill
1243 tunnelkill(t
, reason
);
1246 LOG(1, 0, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1249 for (s
= 1; s
< MAXSESSION
; s
++)
1250 if (session
[s
].tunnel
== t
)
1251 sessionshutdown(s
, reason
);
1253 tunnel
[t
].state
= TUNNELDIE
;
1254 tunnel
[t
].die
= now() + 700; // Clean up in 70 seconds
1255 cluster_send_tunnel(t
);
1256 // TBA - should we wait for sessions to stop?
1258 controlt
*c
= controlnew(4); // sending StopCCN
1259 control16(c
, 1, 1, 1); // result code (admin reasons - TBA make error, general error, add message
1260 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1261 controladd(c
, t
, 0); // send the message
1265 // read and process packet on tunnel (UDP)
1266 void processudp(u8
* buf
, int len
, struct sockaddr_in
*addr
)
1268 char *chapresponse
= NULL
;
1269 u16 l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1273 CSTAT(call_processudp
);
1277 LOG_HEX(5, "UDP Data", buf
, len
);
1278 STAT(tunnel_rx_packets
);
1279 INC_STAT(tunnel_rx_bytes
, len
);
1282 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Short UDP, %d bytes\n", len
);
1283 STAT(tunnel_rx_errors
);
1286 if ((buf
[1] & 0x0F) != 2)
1288 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1289 STAT(tunnel_rx_errors
);
1294 l
= ntohs(*(u16
*) p
);
1297 t
= ntohs(*(u16
*) p
);
1299 s
= ntohs(*(u16
*) p
);
1301 if (s
>= MAXSESSION
)
1303 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Received UDP packet with invalid session ID\n");
1304 STAT(tunnel_rx_errors
);
1309 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Received UDP packet with invalid tunnel ID\n");
1310 STAT(tunnel_rx_errors
);
1315 ns
= ntohs(*(u16
*) p
);
1317 nr
= ntohs(*(u16
*) p
);
1322 u16 o
= ntohs(*(u16
*) p
);
1327 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Bad length %d>%d\n", (p
- buf
), l
);
1328 STAT(tunnel_rx_errors
);
1334 u16 message
= 0xFFFF; // message type
1336 u8 mandatorymessage
= 0;
1337 u8 chap
= 0; // if CHAP being used
1338 u16 asession
= 0; // assigned session
1339 u32 amagic
= 0; // magic number
1340 u8 aflags
= 0; // flags from last LCF
1341 u16 version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1342 int requestchap
= 0; // do we request PAP instead of original CHAP request?
1343 char called
[MAXTEL
] = ""; // called number
1344 char calling
[MAXTEL
] = ""; // calling number
1346 if (!config
->cluster_iam_master
)
1348 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1352 if ((*buf
& 0xCA) != 0xC8)
1354 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Bad control header %02X\n", *buf
);
1355 STAT(tunnel_rx_errors
);
1359 // check for duplicate tunnel open message
1365 // Is this a duplicate of the first packet? (SCCRQ)
1367 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1369 if (tunnel
[i
].state
!= TUNNELOPENING
||
1370 tunnel
[i
].ip
!= ntohl(*(ipt
*) & addr
->sin_addr
) ||
1371 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1374 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Duplicate SCCRQ?\n");
1379 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",
1380 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1382 // if no tunnel specified, assign one
1385 if (!(t
= new_tunnel()))
1387 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "No more tunnels\n");
1388 STAT(tunnel_overflow
);
1392 tunnel
[t
].ip
= ntohl(*(ipt
*) & addr
->sin_addr
);
1393 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1394 tunnel
[t
].window
= 4; // default window
1395 STAT(tunnel_created
);
1396 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, t
, " New tunnel from %u.%u.%u.%u/%u ID %d\n",
1397 tunnel
[t
].ip
>> 24, tunnel
[t
].ip
>> 16 & 255,
1398 tunnel
[t
].ip
>> 8 & 255, tunnel
[t
].ip
& 255, tunnel
[t
].port
, t
);
1401 // If the 'ns' just received is not the 'nr' we're
1402 // expecting, just send an ack and drop it.
1404 // if 'ns' is less, then we got a retransmitted packet.
1405 // if 'ns' is greater than missed a packet. Either way
1406 // we should ignore it.
1407 if (ns
!= tunnel
[t
].nr
)
1409 // is this the sequence we were expecting?
1410 STAT(tunnel_rx_errors
);
1411 LOG(1, ntohl(addr
->sin_addr
.s_addr
), 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1412 t
, ns
, tunnel
[t
].nr
);
1414 if (l
) // Is this not a ZLB?
1419 // This is used to time out old tunnels
1420 tunnel
[t
].lastrec
= time_now
;
1422 // check sequence of this message
1424 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1425 // some to clear maybe?
1426 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1428 controlt
*c
= tunnel
[t
].controls
;
1429 tunnel
[t
].controls
= c
->next
;
1430 tunnel
[t
].controlc
--;
1431 c
->next
= controlfree
;
1434 tunnel
[t
].try = 0; // we have progress
1437 // receiver advance (do here so quoted correctly in any sends below)
1438 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1439 if (skip
< 0) skip
= 0;
1440 if (skip
< tunnel
[t
].controlc
)
1442 // some control packets can now be sent that were previous stuck out of window
1443 int tosend
= tunnel
[t
].window
- skip
;
1444 controlt
*c
= tunnel
[t
].controls
;
1452 tunnel
[t
].try = 0; // first send
1453 tunnelsend(c
->buf
, c
->length
, t
);
1458 if (!tunnel
[t
].controlc
)
1459 tunnel
[t
].retry
= 0; // caught up
1462 { // if not a null message
1464 while (l
&& !(fatal
& 0x80))
1466 u16 n
= (ntohs(*(u16
*) p
) & 0x3FF);
1473 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Invalid length in AVP\n");
1474 STAT(tunnel_rx_errors
);
1481 // handle hidden AVPs
1482 if (!*config
->l2tpsecret
)
1484 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1488 if (!session
[s
].random_vector_length
)
1490 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP requested, but no random vector.\n");
1494 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Hidden AVP\n");
1496 n
= unhide_avp(b
, t
, s
, n
);
1505 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1512 LOG(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown AVP vendor %d\n", ntohs(*(u16
*) (b
)));
1517 mtype
= ntohs(*(u16
*) (b
));
1521 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " AVP %d (%s) len %d\n", mtype
, avpnames
[mtype
], n
);
1524 case 0: // message type
1525 message
= ntohs(*(u16
*) b
);
1526 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Message type = %d (%s)\n", *b
,
1527 l2tp_message_types
[message
]);
1528 mandatorymessage
= flags
;
1530 case 1: // result code
1532 u16 rescode
= ntohs(*(u16
*)(b
));
1533 const char* resdesc
= "(unknown)";
1536 if (rescode
<= MAX_STOPCCN_RESULT_CODE
)
1537 resdesc
= stopccn_result_codes
[rescode
];
1539 else if (message
== 14)
1541 if (rescode
<= MAX_CDN_RESULT_CODE
)
1542 resdesc
= cdn_result_codes
[rescode
];
1545 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Result Code %d: %s\n",
1549 u16 errcode
= ntohs(*(u16
*)(b
+ 2));
1550 const char* errdesc
= "(unknown)";
1551 if (errcode
<= MAX_ERROR_CODE
)
1552 errdesc
= error_codes
[errcode
];
1553 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Error Code %d: %s\n",
1557 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Error String: %.*s\n",
1563 case 2: // protocol version
1565 version
= ntohs(*(u16
*) (b
));
1566 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Protocol version = %d\n", version
);
1567 if (version
&& version
!= 0x0100)
1568 { // allow 0.0 and 1.0
1569 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Bad protocol version %04X\n",
1576 case 3: // framing capabilities
1577 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
1579 case 4: // bearer capabilities
1580 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n");
1582 case 5: // tie breaker
1583 // We never open tunnels, so we don't care about tie breakers
1584 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
1586 case 6: // firmware revision
1587 // LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
1589 case 7: // host name
1590 memset(tunnel
[t
].hostname
, 0, 128);
1591 memcpy(tunnel
[t
].hostname
, b
, (n
>= 127) ? 127 : n
);
1592 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
1593 // TBA - to send to RADIUS
1595 case 8: // vendor name
1596 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
1597 memcpy(tunnel
[t
].vendor
, b
, (n
>= sizeof(tunnel
[t
].vendor
) - 1) ? sizeof(tunnel
[t
].vendor
) - 1 : n
);
1598 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
1600 case 9: // assigned tunnel
1601 tunnel
[t
].far
= ntohs(*(u16
*) (b
));
1602 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
1604 case 10: // rx window
1605 tunnel
[t
].window
= ntohs(*(u16
*) (b
));
1606 if (!tunnel
[t
].window
)
1607 tunnel
[t
].window
= 1; // window of 0 is silly
1608 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " rx window = %d\n", tunnel
[t
].window
);
1610 case 11: // Challenge
1612 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " LAC requested CHAP authentication for tunnel\n");
1613 build_chap_response(b
, 2, n
, &chapresponse
);
1616 case 13: // Response
1617 // Why did they send a response? We never challenge.
1618 LOG(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " received unexpected challenge response\n");
1621 case 14: // assigned session
1622 asession
= session
[s
].far
= ntohs(*(u16
*) (b
));
1623 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " assigned session = %d\n", asession
);
1625 case 15: // call serial number
1626 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " call serial number = %d\n", ntohl(*(u32
*)b
));
1628 case 18: // bearer type
1629 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " bearer type = %d\n", ntohl(*(u32
*)b
));
1632 case 19: // framing type
1633 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " framing type = %d\n", ntohl(*(u32
*)b
));
1636 case 21: // called number
1637 memset(called
, 0, MAXTEL
);
1638 memcpy(called
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
1639 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Called <%s>\n", called
);
1641 case 22: // calling number
1642 memset(calling
, 0, MAXTEL
);
1643 memcpy(calling
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
1644 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Calling <%s>\n", calling
);
1648 case 24: // tx connect speed
1651 session
[s
].tx_connect_speed
= ntohl(*(u32
*)b
);
1655 // AS5300s send connect speed as a string
1657 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
1658 session
[s
].tx_connect_speed
= atol(tmp
);
1660 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " TX connect speed <%u>\n",
1661 session
[s
].tx_connect_speed
);
1663 case 38: // rx connect speed
1666 session
[s
].rx_connect_speed
= ntohl(*(u32
*)b
);
1670 // AS5300s send connect speed as a string
1672 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
1673 session
[s
].rx_connect_speed
= atol(tmp
);
1675 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " RX connect speed <%u>\n",
1676 session
[s
].rx_connect_speed
);
1678 case 25: // Physical Channel ID
1680 u32 tmp
= ntohl(*(u32
*)b
);
1681 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Physical Channel ID <%X>\n", tmp
);
1684 case 29: // Proxy Authentication Type
1686 u16 authtype
= ntohs(*(u16
*)b
);
1687 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Type %d (%s)\n",
1688 authtype
, authtypes
[authtype
]);
1689 requestchap
= (authtype
== 2);
1692 case 30: // Proxy Authentication Name
1694 char authname
[64] = {0};
1695 memcpy(authname
, b
, (n
> 63) ? 63 : n
);
1696 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Name (%s)\n",
1700 case 31: // Proxy Authentication Challenge
1702 memcpy(radius
[session
[s
].radius
].auth
, b
, 16);
1703 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Challenge\n");
1706 case 32: // Proxy Authentication ID
1708 u16 authid
= ntohs(*(u16
*)(b
));
1709 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth ID (%d)\n",
1711 if (session
[s
].radius
)
1712 radius
[session
[s
].radius
].id
= authid
;
1715 case 33: // Proxy Authentication Response
1717 char authresp
[64] = {0};
1718 memcpy(authresp
, b
, (n
> 63) ? 63 : n
);
1719 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Proxy Auth Response\n");
1722 case 27: // last send lcp
1723 { // find magic number
1724 u8
*p
= b
, *e
= p
+ n
;
1725 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
1727 if (*p
== 5 && p
[1] == 6) // Magic-Number
1728 amagic
= ntohl(*(u32
*) (p
+ 2));
1729 else if (*p
== 3 && p
[1] == 5 && *(u16
*) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol
1731 else if (*p
== 7) // Protocol-Field-Compression
1732 aflags
|= SESSIONPFC
;
1733 else if (*p
== 8) // Address-and-Control-Field-Compression
1734 aflags
|= SESSIONACFC
;
1739 case 28: // last recv lcp confreq
1741 case 26: // Initial Received LCP CONFREQ
1743 case 39: // seq required - we control it as an LNS anyway...
1745 case 36: // Random Vector
1746 LOG(4, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
1747 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
1748 memcpy(session
[s
].random_vector
, b
, n
);
1749 session
[s
].random_vector_length
= n
;
1752 LOG(2, ntohl(addr
->sin_addr
.s_addr
), s
, t
, " Unknown AVP type %d\n", mtype
);
1759 tunnelshutdown(t
, "Unknown Mandatory AVP");
1763 case 1: // SCCRQ - Start Control Connection Request
1765 controlt
*c
= controlnew(2); // sending SCCRP
1766 control16(c
, 2, version
, 1); // protocol version
1767 control32(c
, 3, 3, 1); // framing
1768 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
1769 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
1770 control16(c
, 9, t
, 1); // assigned tunnel
1771 controladd(c
, t
, s
); // send the resply
1773 tunnel
[t
].state
= TUNNELOPENING
;
1776 tunnel
[t
].state
= TUNNELOPEN
;
1779 tunnel
[t
].state
= TUNNELOPEN
;
1780 controlnull(t
); // ack
1783 controlnull(t
); // ack
1784 tunnelshutdown(t
, "Stopped"); // Shut down cleanly
1785 tunnelkill(t
, "Stopped"); // Immediately force everything dead
1788 controlnull(t
); // simply ACK
1802 STAT(session_overflow
);
1803 tunnelshutdown(t
, "No free sessions");
1811 sessionfree
= session
[s
].next
;
1812 memset(&session
[s
], 0, sizeof(session
[s
]));
1814 if (s
> config
->cluster_highest_sessionid
)
1815 config
->cluster_highest_sessionid
= s
;
1817 // make a RADIUS session
1818 if (!(r
= radiusnew(s
)))
1820 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "No free RADIUS sessions for ICRQ\n");
1821 sessionkill(s
, "no free RADIUS sesions");
1825 c
= controlnew(11); // sending ICRP
1826 session
[s
].id
= sessionid
++;
1827 session
[s
].opened
= time(NULL
);
1828 session
[s
].tunnel
= t
;
1829 session
[s
].far
= asession
;
1830 session
[s
].last_packet
= time_now
;
1831 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
1832 control16(c
, 14, s
, 1); // assigned session
1833 controladd(c
, t
, s
); // send the reply
1835 // Generate a random challenge
1837 for (n
= 0; n
< 15; n
++)
1838 radius
[r
].auth
[n
] = rand();
1840 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
1841 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
1842 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
1843 STAT(session_created
);
1850 if (amagic
== 0) amagic
= time_now
;
1851 session
[s
].magic
= amagic
; // set magic number
1852 session
[s
].l2tp_flags
= aflags
; // set flags received
1853 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
1854 controlnull(t
); // ack
1855 // In CHAP state, request PAP instead
1860 controlnull(t
); // ack
1861 sessionshutdown(s
, "Closed (Received CDN)");
1864 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Missing message type\n");
1867 STAT(tunnel_rx_errors
);
1868 if (mandatorymessage
& 0x80)
1869 tunnelshutdown(t
, "Unknown message");
1871 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown message type %d\n", message
);
1874 if (chapresponse
) free(chapresponse
);
1875 cluster_send_tunnel(t
);
1879 LOG(4, 0, s
, t
, " Got a ZLB ack\n");
1886 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
1887 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
1888 { // HDLC address header, discard
1894 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Short ppp length %d\n", l
);
1895 STAT(tunnel_rx_errors
);
1905 prot
= ntohs(*(u16
*) p
);
1910 if (s
&& !session
[s
].tunnel
) // Is something wrong??
1912 if (!config
->cluster_iam_master
)
1914 // Pass it off to the master to deal with..
1915 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1920 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "UDP packet contains session %d "
1921 "but no session[%d].tunnel exists (LAC said"
1922 " tunnel = %d). Dropping packet.\n", s
, s
, t
);
1923 STAT(tunnel_rx_errors
);
1929 LOG(3, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
1930 // I'm pretty sure this isn't right -- mo.
1931 // return; // closing session, PPP not processed
1935 session
[s
].last_packet
= time_now
;
1936 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1937 processpap(t
, s
, p
, l
);
1939 else if (prot
== PPPCHAP
)
1941 session
[s
].last_packet
= time_now
;
1942 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1943 processchap(t
, s
, p
, l
);
1945 else if (prot
== PPPLCP
)
1947 session
[s
].last_packet
= time_now
;
1948 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1949 processlcp(t
, s
, p
, l
);
1951 else if (prot
== PPPIPCP
)
1953 session
[s
].last_packet
= time_now
;
1954 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1955 processipcp(t
, s
, p
, l
);
1957 else if (prot
== PPPCCP
)
1959 session
[s
].last_packet
= time_now
;
1960 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
1961 processccp(t
, s
, p
, l
);
1963 else if (prot
== PPPIP
)
1965 session
[s
].last_packet
= time_now
;
1966 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
1968 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1971 processipin(t
, s
, p
, l
);
1975 STAT(tunnel_rx_errors
);
1976 LOG(1, ntohl(addr
->sin_addr
.s_addr
), s
, t
, "Unknown PPP protocol %04X\n", prot
);
1981 // read and process packet on tun
1982 static void processtun(u8
* buf
, int len
)
1984 LOG_HEX(5, "Receive TUN Data", buf
, len
);
1985 STAT(tun_rx_packets
);
1986 INC_STAT(tun_rx_bytes
, len
);
1988 CSTAT(call_processtun
);
1994 LOG(1, 0, 0, 0, "Short tun packet %d bytes\n", len
);
1995 STAT(tun_rx_errors
);
1999 if (*(u16
*) (buf
+ 2) == htons(PKTIP
)) // IP
2000 processipout(buf
, len
);
2005 // Maximum number of actions to complete.
2006 // This is to avoid sending out too many packets
2008 #define MAX_ACTIONS 500
2010 static int regular_cleanups(void)
2012 static sessionidt s
= 0; // Next session to check for actions on.
2016 static clockt next_acct
= 0;
2019 LOG(3, 0, 0, 0, "Begin regular cleanup\n");
2021 for (r
= 1; r
< MAXRADIUS
; r
++)
2023 if (!radius
[r
].state
)
2025 if (radius
[r
].retry
)
2027 if (radius
[r
].retry
<= TIME
)
2030 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
2032 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
2034 // check for expired tunnels
2035 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2037 STAT(tunnel_timeout
);
2038 tunnelkill(t
, "Expired");
2041 // check for message resend
2042 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2044 // resend pending messages as timeout on reply
2045 if (tunnel
[t
].retry
<= TIME
)
2047 controlt
*c
= tunnel
[t
].controls
;
2048 u8 w
= tunnel
[t
].window
;
2049 tunnel
[t
].try++; // another try
2050 if (tunnel
[t
].try > 5)
2051 tunnelkill(t
, "Timeout on control message"); // game over
2055 tunnelsend(c
->buf
, c
->length
, t
);
2061 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2063 controlt
*c
= controlnew(6); // sending HELLO
2064 controladd(c
, t
, 0); // send the message
2065 LOG(3, tunnel
[t
].ip
, 0, t
, "Sending HELLO message\n");
2068 // Check for tunnel changes requested from the CLI
2069 if ((a
= cli_tunnel_actions
[t
].action
))
2071 cli_tunnel_actions
[t
].action
= 0;
2072 if (a
& CLI_TUN_KILL
)
2074 LOG(2, tunnel
[t
].ip
, 0, t
, "Dropping tunnel by CLI\n");
2075 tunnelshutdown(t
, "Requested by administrator");
2082 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2085 if (s
> config
->cluster_highest_sessionid
)
2088 if (!session
[s
].tunnel
) // Session isn't in use
2091 if (!session
[s
].die
&& session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2093 // IPCP has not completed yet. Resend
2094 LOG(3, session
[s
].ip
, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2095 sendipcp(session
[s
].tunnel
, s
);
2098 // check for expired sessions
2099 if (session
[s
].die
&& session
[s
].die
<= TIME
)
2101 sessionkill(s
, "Expired");
2102 if (++count
>= MAX_ACTIONS
) break;
2106 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2107 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2109 sessionkill(s
, "No response to LCP ECHO requests");
2110 STAT(session_timeout
);
2111 if (++count
>= MAX_ACTIONS
) break;
2115 // No data in IDLE_TIMEOUT seconds, send LCP ECHO
2116 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2118 u8 b
[MAXCONTROL
] = {0};
2120 u8
*q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2124 *(u8
*)(q
+ 1) = (time_now
% 255); // ID
2125 *(u16
*)(q
+ 2) = htons(8); // Length
2126 *(u32
*)(q
+ 4) = 0; // Magic Number (not supported)
2128 LOG(4, session
[s
].ip
, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2129 (int)(time_now
- session
[s
].last_packet
));
2130 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2131 if (++count
>= MAX_ACTIONS
) break;
2134 // Check for actions requested from the CLI
2135 if ((a
= cli_session_actions
[s
].action
))
2139 cli_session_actions
[s
].action
= 0;
2140 if (a
& CLI_SESS_KILL
)
2142 LOG(2, 0, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2143 sessionshutdown(s
, "Requested by administrator");
2144 a
= 0; // dead, no need to check for other actions
2147 if (a
& CLI_SESS_NOSNOOP
)
2149 LOG(2, 0, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2150 session
[s
].snoop_ip
= 0;
2151 session
[s
].snoop_port
= 0;
2154 else if (a
& CLI_SESS_SNOOP
)
2156 LOG(2, 0, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2157 inet_toa(cli_session_actions
[s
].snoop_ip
), cli_session_actions
[s
].snoop_port
);
2159 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2160 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2164 if (a
& CLI_SESS_NOTHROTTLE
)
2166 LOG(2, 0, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2167 throttle_session(s
, 0, 0);
2170 else if (a
& CLI_SESS_THROTTLE
)
2172 LOG(2, 0, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2173 cli_session_actions
[s
].throttle_in
,
2174 cli_session_actions
[s
].throttle_out
);
2176 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2180 if (a
& CLI_SESS_NOFILTER
)
2182 LOG(2, 0, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2183 filter_session(s
, 0, 0);
2186 else if (a
& CLI_SESS_FILTER
)
2188 LOG(2, 0, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2189 cli_session_actions
[s
].filter_in
,
2190 cli_session_actions
[s
].filter_out
);
2192 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2197 cluster_send_session(s
);
2199 if (++count
>= MAX_ACTIONS
) break;
2203 if (*config
->accounting_dir
&& next_acct
<= TIME
)
2205 // Dump accounting data
2206 next_acct
= TIME
+ ACCT_TIME
;
2210 if (count
>= MAX_ACTIONS
)
2211 return 1; // Didn't finish!
2213 LOG(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2219 // Are we in the middle of a tunnel update, or radius
2222 static int still_busy(void)
2225 static clockt last_talked
= 0;
2226 static clockt start_busy_wait
= 0;
2227 if (start_busy_wait
== 0)
2228 start_busy_wait
= TIME
;
2230 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2232 if (!tunnel
[i
].controlc
)
2235 if (last_talked
!= TIME
)
2237 LOG(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i
);
2243 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2244 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2246 LOG(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2250 for (i
= 1; i
< MAXRADIUS
; i
++)
2252 if (radius
[i
].state
== RADIUSNULL
)
2254 if (radius
[i
].state
== RADIUSWAIT
)
2257 if (last_talked
!= TIME
)
2259 LOG(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2268 static fd_set readset
;
2269 static int readset_n
= 0;
2271 // main loop - gets packets on tun or udp and processes them
2272 static void mainloop(void)
2277 clockt next_cluster_ping
= 0; // send initial ping immediately
2278 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2280 LOG(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2281 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2284 FD_SET(udpfd
, &readset
);
2285 FD_SET(tunfd
, &readset
);
2286 FD_SET(controlfd
, &readset
);
2287 FD_SET(clifd
, &readset
);
2288 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2290 if (tunfd
> readset_n
) readset_n
= tunfd
;
2291 if (controlfd
> readset_n
) readset_n
= controlfd
;
2292 if (clifd
> readset_n
) readset_n
= clifd
;
2293 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2295 while (!main_quit
|| still_busy())
2301 int bgp_set
[BGP_NUM_PEERS
];
2304 if (config
->reload_config
)
2306 // Update the config state based on config settings
2310 memcpy(&r
, &readset
, sizeof(fd_set
));
2312 to
.tv_usec
= 100000; // 1/10th of a second.
2316 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2318 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2321 FD_SET(bgp_peers
[i
].sock
, &r
);
2322 if (bgp_peers
[i
].sock
> n
)
2323 n
= bgp_peers
[i
].sock
;
2328 FD_SET(bgp_peers
[i
].sock
, &w
);
2329 if (bgp_peers
[i
].sock
> n
)
2330 n
= bgp_peers
[i
].sock
;
2334 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2336 n
= select(n
+ 1, &r
, 0, 0, &to
);
2342 if (errno
== EINTR
||
2343 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2346 LOG(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2352 struct sockaddr_in addr
;
2353 int alen
= sizeof(addr
);
2354 if (FD_ISSET(udpfd
, &r
))
2357 for (c
= 0; c
< config
->multi_read_count
; c
++)
2359 if ((n
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
2360 processudp(buf
, n
, &addr
);
2365 if (FD_ISSET(tunfd
, &r
))
2368 for (c
= 0; c
< config
->multi_read_count
; c
++)
2370 if ((n
= read(tunfd
, buf
, sizeof(buf
))) > 0)
2377 if (config
->cluster_iam_master
)
2378 for (i
= 0; i
< config
->num_radfds
; i
++)
2379 if (FD_ISSET(radfds
[i
], &r
))
2380 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2382 if (FD_ISSET(cluster_sockfd
, &r
))
2385 size
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
);
2386 processcluster(buf
, size
, addr
.sin_addr
.s_addr
);
2389 if (FD_ISSET(controlfd
, &r
))
2390 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
2392 if (FD_ISSET(clifd
, &r
))
2394 struct sockaddr_in addr
;
2396 int len
= sizeof(addr
);
2398 if ((sockfd
= accept(clifd
, (struct sockaddr
*)&addr
, &len
)) <= 0)
2400 LOG(0, 0, 0, 0, "accept error: %s\n", strerror(errno
));
2411 // Runs on every machine (master and slaves).
2412 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
2414 // Check to see which of the cluster is still alive..
2416 cluster_send_ping(basetime
); // Only does anything if we're a slave
2417 cluster_check_master(); // ditto.
2419 cluster_heartbeat(); // Only does anything if we're a master.
2420 cluster_check_slaves(); // ditto.
2422 master_update_counts(); // If we're a slave, send our byte counters to our master.
2424 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
2425 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
2427 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
2430 // Run token bucket filtering queue..
2431 // Only run it every 1/10th of a second.
2432 // Runs on all machines both master and slave.
2434 static clockt last_run
= 0;
2435 if (last_run
!= TIME
)
2442 /* Handle timeouts. Make sure that this gets run anyway, even if there was
2443 * something to read, else under load this will never actually run....
2446 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
2448 if (regular_cleanups())
2451 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
2455 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
2460 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2462 bgp_process(&bgp_peers
[i
],
2463 bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0,
2464 bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0);
2469 // Are we the master and shutting down??
2470 if (config
->cluster_iam_master
)
2471 cluster_heartbeat(); // Flush any queued changes..
2473 // Ok. Notify everyone we're shutting down. If we're
2474 // the master, this will force an election.
2475 cluster_send_ping(0);
2478 // Important!!! We MUST not process any packets past this point!
2481 static void stripdomain(char *host
)
2485 if ((p
= strchr(host
, '.')))
2491 FILE *resolv
= fopen("/etc/resolv.conf", "r");
2497 while (fgets(buf
, sizeof(buf
), resolv
))
2499 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
2502 if (!isspace(buf
[6]))
2506 while (isspace(*b
)) b
++;
2511 while (*b
&& !isspace(*b
)) b
++;
2513 if (buf
[0] == 'd') // domain is canonical
2519 // first search line
2522 // hold, may be subsequent domain line
2523 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
2534 int hl
= strlen(host
);
2535 int dl
= strlen(domain
);
2536 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
2537 host
[hl
-dl
- 1] = 0;
2541 *p
= 0; // everything after first dot
2546 // Init data structures
2547 static void initdata(int optdebug
, char *optconfig
)
2551 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
2553 LOG(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
2556 if (!(config
= shared_malloc(sizeof(configt
))))
2558 LOG(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno
));
2561 memset(config
, 0, sizeof(configt
));
2562 time(&config
->start_time
);
2563 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
2564 config
->debug
= optdebug
;
2565 config
->num_tbfs
= MAXTBFS
;
2566 config
->rl_rate
= 28; // 28kbps
2568 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
2570 LOG(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
2573 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
2575 LOG(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
2579 if (!(sess_count
= shared_malloc(sizeof(sessioncountt
) * MAXSESSION
)))
2581 LOG(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno
));
2585 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
2587 LOG(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
2591 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
2593 LOG(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
2597 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
2599 LOG(0, 0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
2602 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
2605 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
2607 LOG(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
2610 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
2613 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
2615 LOG(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
2618 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
2620 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
2622 LOG(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
2625 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
2627 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
2628 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
2629 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
2630 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
2632 // Put all the sessions on the free list marked as undefined.
2633 for (i
= 1; i
< MAXSESSION
- 1; i
++)
2635 session
[i
].next
= i
+ 1;
2636 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
2638 session
[MAXSESSION
- 1].next
= 0;
2641 // Mark all the tunnels as undefined (waiting to be filled in by a download).
2642 for (i
= 1; i
< MAXTUNNEL
- 1; i
++)
2643 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
2647 // Grab my hostname unless it's been specified
2648 gethostname(hostname
, sizeof(hostname
));
2649 stripdomain(hostname
);
2652 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
2655 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
2657 LOG(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
2663 static int assign_ip_address(sessionidt s
)
2667 time_t best_time
= time_now
;
2668 char *u
= session
[s
].user
;
2672 CSTAT(call_assign_ip_address
);
2674 for (i
= 1; i
< ip_pool_size
; i
++)
2676 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
2679 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
2686 if (ip_address_pool
[i
].last
< best_time
)
2689 if (!(best_time
= ip_address_pool
[i
].last
))
2690 break; // never used, grab this one
2696 LOG(0, 0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
2700 session
[s
].ip
= ip_address_pool
[best
].address
;
2701 session
[s
].ip_pool_index
= best
;
2702 ip_address_pool
[best
].assigned
= 1;
2703 ip_address_pool
[best
].last
= time_now
;
2704 ip_address_pool
[best
].session
= s
;
2705 if (session
[s
].walled_garden
)
2706 /* Don't track addresses of users in walled garden (note: this
2707 means that their address isn't "sticky" even if they get
2709 ip_address_pool
[best
].user
[0] = 0;
2711 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
2714 LOG(4, ip_address_pool
[best
].address
, s
, session
[s
].tunnel
,
2715 "assign_ip_address(): %s ip address %d from pool\n", reuse
? "Reusing" : "Allocating", best
);
2720 static void free_ip_address(sessionidt s
)
2722 int i
= session
[s
].ip_pool_index
;
2725 CSTAT(call_free_ip_address
);
2728 return; // what the?
2730 if (i
< 0) // Is this actually part of the ip pool?
2734 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
2736 ip_address_pool
[i
].assigned
= 0;
2737 ip_address_pool
[i
].session
= 0;
2738 ip_address_pool
[i
].last
= time_now
;
2742 // Fsck the address pool against the session table.
2743 // Normally only called when we become a master.
2745 // This isn't perfect: We aren't keep tracking of which
2746 // users used to have an IP address.
2748 void rebuild_address_pool(void)
2753 // Zero the IP pool allocation, and build
2754 // a map from IP address to pool index.
2755 for (i
= 1; i
< MAXIPPOOL
; ++i
)
2757 ip_address_pool
[i
].assigned
= 0;
2758 ip_address_pool
[i
].session
= 0;
2759 if (!ip_address_pool
[i
].address
)
2762 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
2765 for (i
= 0; i
< MAXSESSION
; ++i
)
2768 if (!session
[i
].ip
|| !session
[i
].tunnel
)
2770 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
2772 if (session
[i
].ip_pool_index
< 0)
2774 // Not allocated out of the pool.
2775 if (ipid
< 1) // Not found in the pool either? good.
2778 LOG(0, 0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
2779 i
, inet_toa(session
[i
].ip
), ipid
);
2781 // Fall through and process it as part of the pool.
2785 if (ipid
> MAXIPPOOL
|| ipid
< 0)
2787 LOG(0, 0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
2789 session
[i
].ip_pool_index
= ipid
;
2793 ip_address_pool
[ipid
].assigned
= 1;
2794 ip_address_pool
[ipid
].session
= i
;
2795 ip_address_pool
[ipid
].last
= time_now
;
2796 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
2797 session
[i
].ip_pool_index
= ipid
;
2798 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
2803 // Fix the address pool to match a changed session.
2804 // (usually when the master sends us an update).
2805 static void fix_address_pool(int sid
)
2809 ipid
= session
[sid
].ip_pool_index
;
2811 if (ipid
> ip_pool_size
)
2812 return; // Ignore it. rebuild_address_pool will fix it up.
2814 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
2815 return; // Just ignore it. rebuild_address_pool will take care of it.
2817 ip_address_pool
[ipid
].assigned
= 1;
2818 ip_address_pool
[ipid
].session
= sid
;
2819 ip_address_pool
[ipid
].last
= time_now
;
2820 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
2824 // Add a block of addresses to the IP pool to hand out.
2826 static void add_to_ip_pool(u32 addr
, u32 mask
)
2830 mask
= 0xffffffff; // Host route only.
2834 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
2837 for (i
= addr
;(i
& mask
) == addr
; ++i
)
2839 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
2840 continue; // Skip 0 and broadcast addresses.
2842 ip_address_pool
[ip_pool_size
].address
= i
;
2843 ip_address_pool
[ip_pool_size
].assigned
= 0;
2845 if (ip_pool_size
>= MAXIPPOOL
)
2847 LOG(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr
)) );
2853 // Initialize the IP address pool
2854 static void initippool()
2859 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
2861 if (!(f
= fopen(IPPOOLFILE
, "r")))
2863 LOG(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
2867 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
2870 buf
[4095] = 0; // Force it to be zero terminated/
2872 if (*buf
== '#' || *buf
== '\n')
2873 continue; // Skip comments / blank lines
2874 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
2875 if ((p
= (char *)strchr(buf
, ':')))
2879 src
= inet_addr(buf
);
2880 if (src
== INADDR_NONE
)
2882 LOG(0, 0, 0, 0, "Invalid address pool IP %s\n", buf
);
2885 // This entry is for a specific IP only
2886 if (src
!= config
->bind_address
)
2891 if ((p
= (char *)strchr(pool
, '/')))
2895 u32 start
= 0, mask
= 0;
2897 LOG(2, 0, 0, 0, "Adding IP address range %s\n", buf
);
2899 if (!*p
|| !(numbits
= atoi(p
)))
2901 LOG(0, 0, 0, 0, "Invalid pool range %s\n", buf
);
2904 start
= ntohl(inet_addr(pool
));
2905 mask
= (u32
)(pow(2, numbits
) - 1) << (32 - numbits
);
2907 // Add a static route for this pool
2908 LOG(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start
)), 32 + mask
);
2909 routeset(0, start
, mask
, 0, 1);
2911 add_to_ip_pool(start
, mask
);
2915 // It's a single ip address
2916 add_to_ip_pool(inet_addr(pool
), 0);
2920 LOG(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
2923 void snoop_send_packet(char *packet
, u16 size
, ipt destination
, u16 port
)
2925 struct sockaddr_in snoop_addr
= {0};
2926 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
2929 snoop_addr
.sin_family
= AF_INET
;
2930 snoop_addr
.sin_addr
.s_addr
= destination
;
2931 snoop_addr
.sin_port
= ntohs(port
);
2933 LOG(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n",
2934 packet
, size
, inet_toa(snoop_addr
.sin_addr
.s_addr
), htons(snoop_addr
.sin_port
));
2935 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
2936 LOG(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
2937 STAT(packets_snooped
);
2940 static void dump_acct_info()
2942 char filename
[1024];
2944 time_t t
= time(NULL
);
2949 CSTAT(call_dump_acct_info
);
2951 strftime(timestr
, 64, "%Y%m%d%H%M%S", localtime(&t
));
2952 snprintf(filename
, 1024, "%s/%s", config
->accounting_dir
, timestr
);
2954 for (i
= 0; i
< MAXSESSION
; i
++)
2956 if (!session
[i
].opened
|| !session
[i
].ip
|| !(session
[i
].cin
|| session
[i
].cout
) || !*session
[i
].user
|| session
[i
].walled_garden
)
2960 time_t now
= time(NULL
);
2961 if (!(f
= fopen(filename
, "w")))
2963 LOG(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
2966 LOG(3, 0, 0, 0, "Dumping accounting information to %s\n", filename
);
2967 fprintf(f
, "# dslwatch.pl dump file V1.01\n"
2971 "# format: username ip qos uptxoctets downrxoctets\n",
2977 LOG(4, 0, 0, 0, "Dumping accounting information for %s\n", session
[i
].user
);
2978 fprintf(f
, "%s %s %d %u %u\n",
2979 session
[i
].user
, // username
2980 inet_toa(htonl(session
[i
].ip
)), // ip
2981 (session
[i
].throttle_in
|| session
[i
].throttle_out
) ? 2 : 1, // qos
2982 (u32
)session
[i
].cin
, // uptxoctets
2983 (u32
)session
[i
].cout
); // downrxoctets
2985 session
[i
].pin
= session
[i
].cin
= 0;
2986 session
[i
].pout
= session
[i
].cout
= 0;
2994 int main(int argc
, char *argv
[])
2998 char *optconfig
= CONFIGFILE
;
3000 time(&basetime
); // start clock
3003 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3008 if (fork()) exit(0);
3010 freopen("/dev/null", "r", stdin
);
3011 freopen("/dev/null", "w", stdout
);
3012 freopen("/dev/null", "w", stderr
);
3021 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3024 printf("Args are:\n"
3025 "\t-d\t\tDetach from terminal\n"
3026 "\t-c <file>\tConfig file\n"
3027 "\t-h <hostname>\tForce hostname\n"
3035 // Start the timer routine off
3037 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3038 signal(SIGALRM
, sigalrm_handler
);
3039 siginterrupt(SIGALRM
, 0);
3042 initdata(optdebug
, optconfig
);
3046 init_tbf(config
->num_tbfs
);
3048 LOG(0, 0, 0, 0, "L2TPNS version " VERSION
"\n");
3049 LOG(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
3050 LOG(0, 0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3053 rlim
.rlim_cur
= RLIM_INFINITY
;
3054 rlim
.rlim_max
= RLIM_INFINITY
;
3055 // Remove the maximum core size
3056 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3057 LOG(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3058 // Make core dumps go to /tmp
3062 if (config
->scheduler_fifo
)
3065 struct sched_param params
= {0};
3066 params
.sched_priority
= 1;
3068 if (get_nprocs() < 2)
3070 LOG(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3071 config
->scheduler_fifo
= 0;
3075 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3077 LOG(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3081 LOG(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3082 config
->scheduler_fifo
= 0;
3087 /* Set up the cluster communications port. */
3088 if (cluster_init() < 0)
3092 signal(SIGPIPE
, SIG_IGN
);
3093 bgp_setup(config
->as_number
);
3094 bgp_add_route(config
->bind_address
, 0xffffffff);
3095 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3097 if (config
->neighbour
[i
].name
[0])
3098 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3099 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3100 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3105 LOG(1, 0, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3113 signal(SIGHUP
, sighup_handler
);
3114 signal(SIGTERM
, sigterm_handler
);
3115 signal(SIGINT
, sigterm_handler
);
3116 signal(SIGQUIT
, sigquit_handler
);
3117 signal(SIGCHLD
, sigchild_handler
);
3119 // Prevent us from getting paged out
3120 if (config
->lock_pages
)
3122 if (!mlockall(MCL_CURRENT
))
3123 LOG(1, 0, 0, 0, "Locking pages into memory\n");
3125 LOG(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3130 // Drop privileges here
3131 if (config
->target_uid
> 0 && geteuid() == 0)
3132 setuid(config
->target_uid
);
3137 /* try to shut BGP down cleanly; with luck the sockets will be
3138 writable since we're out of the select */
3139 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3140 if (bgp_peers
[i
].state
== Established
)
3141 bgp_stop(&bgp_peers
[i
]);
3144 /* remove plugins (so cleanup code gets run) */
3147 // Remove the PID file if we wrote it
3148 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3149 unlink(config
->pid_file
);
3151 /* kill CLI children */
3152 signal(SIGTERM
, SIG_IGN
);
3157 static void sighup_handler(int sig
)
3159 if (log_stream
&& log_stream
!= stderr
)
3168 static void sigalrm_handler(int sig
)
3170 // Log current traffic stats
3172 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3173 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3174 (udp_rx
/ 1024.0 / 1024.0 * 8),
3175 (eth_tx
/ 1024.0 / 1024.0 * 8),
3176 (eth_rx
/ 1024.0 / 1024.0 * 8),
3177 (udp_tx
/ 1024.0 / 1024.0 * 8),
3178 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3179 udp_rx_pkt
, eth_rx_pkt
);
3181 udp_tx
= udp_rx
= 0;
3182 udp_rx_pkt
= eth_rx_pkt
= 0;
3183 eth_tx
= eth_rx
= 0;
3185 if (config
->dump_speed
)
3186 printf("%s\n", config
->bandwidth
);
3188 // Update the internal time counter
3190 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3195 struct param_timer p
= { time_now
};
3196 run_plugins(PLUGIN_TIMER
, &p
);
3201 static void sigterm_handler(int sig
)
3203 LOG(1, 0, 0, 0, "Shutting down cleanly\n");
3204 if (config
->save_state
)
3210 static void sigquit_handler(int sig
)
3214 LOG(1, 0, 0, 0, "Shutting down without saving sessions\n");
3215 for (i
= 1; i
< MAXSESSION
; i
++)
3217 if (session
[i
].opened
)
3218 sessionkill(i
, "L2TPNS Closing");
3220 for (i
= 1; i
< MAXTUNNEL
; i
++)
3222 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3223 tunnelshutdown(i
, "L2TPNS Closing");
3229 static void sigchild_handler(int sig
)
3231 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3235 static void read_state()
3241 char magic
[sizeof(DUMP_MAGIC
) - 1];
3244 if (!config
->save_state
)
3250 if (stat(STATEFILE
, &sb
) < 0)
3256 if (sb
.st_mtime
< (time(NULL
) - 60))
3258 LOG(0, 0, 0, 0, "State file is too old to read, ignoring\n");
3263 f
= fopen(STATEFILE
, "r");
3268 LOG(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno
));
3272 if (fread(magic
, sizeof(magic
), 1, f
) != 1 || strncmp(magic
, DUMP_MAGIC
, sizeof(magic
)))
3274 LOG(0, 0, 0, 0, "Bad state file magic\n");
3278 LOG(1, 0, 0, 0, "Reading state information\n");
3279 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] > MAXIPPOOL
|| buf
[1] != sizeof(ippoolt
))
3281 LOG(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
3285 if (buf
[0] > ip_pool_size
)
3287 LOG(0, 0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf
[0], ip_pool_size
);
3291 LOG(2, 0, 0, 0, "Loading %u ip addresses\n", buf
[0]);
3292 for (i
= 0; i
< buf
[0]; i
++)
3294 if (fread(&itmp
, sizeof(itmp
), 1, f
) != 1)
3296 LOG(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i
, strerror(errno
));
3300 if (itmp
.address
!= ip_address_pool
[i
].address
)
3302 LOG(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i
);
3306 memcpy(&ip_address_pool
[i
], &itmp
, sizeof(itmp
));
3309 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXTUNNEL
|| buf
[1] != sizeof(tunnelt
))
3311 LOG(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
3315 LOG(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL
);
3316 if (fread(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3318 LOG(0, 0, 0, 0, "Error reading tunnel data from state file\n");
3322 for (i
= 0; i
< MAXTUNNEL
; i
++)
3324 tunnel
[i
].controlc
= 0;
3325 tunnel
[i
].controls
= NULL
;
3326 tunnel
[i
].controle
= NULL
;
3327 if (*tunnel
[i
].hostname
)
3328 LOG(3, 0, 0, 0, "Created tunnel for %s\n", tunnel
[i
].hostname
);
3331 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXSESSION
|| buf
[1] != sizeof(sessiont
))
3333 LOG(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
3337 LOG(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION
);
3338 if (fread(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3340 LOG(0, 0, 0, 0, "Error reading session data from state file\n");
3344 for (i
= 0; i
< MAXSESSION
; i
++)
3346 session
[i
].tbf_in
= 0;
3347 session
[i
].tbf_out
= 0;
3348 if (session
[i
].opened
)
3350 LOG(2, 0, i
, 0, "Loaded active session for user %s\n", session
[i
].user
);
3352 sessionsetup(session
[i
].tunnel
, i
);
3357 LOG(0, 0, 0, 0, "Loaded saved state information\n");
3360 static void dump_state()
3365 if (!config
->save_state
)
3370 if (!(f
= fopen(STATEFILE
, "w")))
3373 LOG(1, 0, 0, 0, "Dumping state information\n");
3375 if (fwrite(DUMP_MAGIC
, sizeof(DUMP_MAGIC
) - 1, 1, f
) != 1)
3378 LOG(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size
);
3379 buf
[0] = ip_pool_size
;
3380 buf
[1] = sizeof(ippoolt
);
3381 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3383 if (fwrite(ip_address_pool
, sizeof(ippoolt
), ip_pool_size
, f
) != ip_pool_size
)
3386 LOG(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL
);
3388 buf
[1] = sizeof(tunnelt
);
3389 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3391 if (fwrite(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3394 LOG(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION
);
3395 buf
[0] = MAXSESSION
;
3396 buf
[1] = sizeof(sessiont
);
3397 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3399 if (fwrite(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3407 LOG(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno
));
3411 static void build_chap_response(char *challenge
, u8 id
, u16 challenge_length
, char **challenge_response
)
3414 *challenge_response
= NULL
;
3416 if (!*config
->l2tpsecret
)
3418 LOG(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3422 LOG(4, 0, 0, 0, " Building challenge response for CHAP request\n");
3424 *challenge_response
= (char *)calloc(17, 1);
3427 MD5Update(&ctx
, &id
, 1);
3428 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3429 MD5Update(&ctx
, challenge
, challenge_length
);
3430 MD5Final(*challenge_response
, &ctx
);
3435 static int facility_value(char *name
)
3438 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3440 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3441 return facilitynames
[i
].c_val
;
3446 static void update_config()
3449 static int timeout
= 0;
3450 static int interval
= 0;
3460 if (*config
->log_filename
)
3462 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3464 char *p
= config
->log_filename
+ 7;
3467 openlog("l2tpns", LOG_PID
, facility_value(p
));
3471 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
3473 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
3475 fseek(log_stream
, 0, SEEK_END
);
3476 setbuf(log_stream
, NULL
);
3480 log_stream
= stderr
;
3481 setbuf(log_stream
, NULL
);
3487 log_stream
= stderr
;
3488 setbuf(log_stream
, NULL
);
3493 config
->numradiusservers
= 0;
3494 for (i
= 0; i
< MAXRADSERVER
; i
++)
3495 if (config
->radiusserver
[i
])
3497 config
->numradiusservers
++;
3498 // Set radius port: if not set, take the port from the
3499 // first radius server. For the first radius server,
3500 // take the #defined default value from l2tpns.h
3502 // test twice, In case someone works with
3503 // a secondary radius server without defining
3504 // a primary one, this will work even then.
3505 if (i
>0 && !config
->radiusport
[i
])
3506 config
->radiusport
[i
] = config
->radiusport
[i
-1];
3507 if (!config
->radiusport
[i
])
3508 config
->radiusport
[i
] = RADPORT
;
3511 if (!config
->numradiusservers
)
3513 LOG(0, 0, 0, 0, "No RADIUS servers defined!\n");
3516 config
->num_radfds
= 2 << RADIUS_SHIFT
;
3519 for (i
= 0; i
< MAXPLUGINS
; i
++)
3521 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
3524 if (*config
->plugins
[i
])
3527 add_plugin(config
->plugins
[i
]);
3529 else if (*config
->old_plugins
[i
])
3532 remove_plugin(config
->old_plugins
[i
]);
3535 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
3536 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
3537 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
3538 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
3539 if (!*config
->cluster_interface
)
3540 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
3542 if (!config
->cluster_hb_interval
)
3543 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
3545 if (!config
->cluster_hb_timeout
)
3546 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
3548 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
3550 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
3551 // late, ensure we're sufficiently larger than that
3552 int t
= 4 * config
->cluster_hb_interval
+ 11;
3554 if (config
->cluster_hb_timeout
< t
)
3556 LOG(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
3557 config
->cluster_hb_timeout
= t
;
3560 // Push timing changes to the slaves immediately if we're the master
3561 if (config
->cluster_iam_master
)
3562 cluster_heartbeat();
3564 interval
= config
->cluster_hb_interval
;
3565 timeout
= config
->cluster_hb_timeout
;
3569 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
3572 if ((f
= fopen(config
->pid_file
, "w")))
3574 fprintf(f
, "%d\n", getpid());
3576 config
->wrote_pid
= 1;
3580 LOG(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
3584 config
->reload_config
= 0;
3587 static void read_config_file()
3591 if (!config
->config_file
) return;
3592 if (!(f
= fopen(config
->config_file
, "r")))
3594 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
3598 LOG(3, 0, 0, 0, "Reading config file %s\n", config
->config_file
);
3600 LOG(3, 0, 0, 0, "Done reading config file\n");
3605 int sessionsetup(tunnelidt t
, sessionidt s
)
3607 // A session now exists, set it up
3613 CSTAT(call_sessionsetup
);
3615 LOG(3, session
[s
].ip
, s
, t
, "Doing session setup for session\n");
3617 if (!session
[s
].ip
|| session
[s
].ip
== 0xFFFFFFFE)
3619 assign_ip_address(s
);
3622 LOG(0, 0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
3623 sessionshutdown(s
, "No IP addresses available");
3626 LOG(3, 0, s
, t
, " No IP allocated. Assigned %s from pool\n",
3627 inet_toa(htonl(session
[s
].ip
)));
3631 // Make sure this is right
3632 session
[s
].tunnel
= t
;
3634 // zap old sessions with same IP and/or username
3635 // Don't kill gardened sessions - doing so leads to a DoS
3636 // from someone who doesn't need to know the password
3639 user
= session
[s
].user
;
3640 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3642 if (i
== s
) continue;
3643 if (ip
== session
[i
].ip
) sessionkill(i
, "Duplicate IP address");
3644 if (!session
[s
].walled_garden
&& !session
[i
].walled_garden
&& strcasecmp(user
, session
[i
].user
) == 0)
3645 sessionkill(i
, "Duplicate session for users");
3652 // Add the route for this session.
3653 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
3655 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
3656 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
3659 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
3662 // Static IPs need to be routed if not already
3663 // convered by a Framed-Route. Anything else is part
3664 // of the IP address pool and is already routed, it
3665 // just needs to be added to the IP cache.
3666 if (session
[s
].ip_pool_index
== -1) // static ip
3668 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
3671 cache_ipmap(session
[s
].ip
, s
);
3674 if (!session
[s
].unique_id
)
3676 // did this session just finish radius?
3677 LOG(3, session
[s
].ip
, s
, t
, "Sending initial IPCP to client\n");
3679 session
[s
].unique_id
= ++last_id
;
3682 // Run the plugin's against this new session.
3684 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
3685 run_plugins(PLUGIN_NEW_SESSION
, &data
);
3688 // Allocate TBFs if throttled
3689 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
3690 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
3692 session
[s
].last_packet
= time_now
;
3695 char *sessionip
, *tunnelip
;
3696 sessionip
= strdup(inet_toa(htonl(session
[s
].ip
)));
3697 tunnelip
= strdup(inet_toa(htonl(tunnel
[t
].ip
)));
3698 LOG(2, session
[s
].ip
, s
, t
, "Login by %s at %s from %s (%s)\n",
3699 session
[s
].user
, sessionip
, tunnelip
, tunnel
[t
].hostname
);
3700 if (sessionip
) free(sessionip
);
3701 if (tunnelip
) free(tunnelip
);
3704 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
3706 return 1; // RADIUS OK and IP allocated, done...
3710 // This session just got dropped on us by the master or something.
3711 // Make sure our tables up up to date...
3713 int load_session(sessionidt s
, sessiont
*new)
3719 if (new->ip_pool_index
>= MAXIPPOOL
||
3720 new->tunnel
>= MAXTUNNEL
)
3722 LOG(0,0,s
,0, "Strange session update received!\n");
3723 // FIXME! What to do here?
3728 // Ok. All sanity checks passed. Now we're committed to
3729 // loading the new session.
3732 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
3734 // See if routes/ip cache need updating
3735 if (new->ip
!= session
[s
].ip
)
3738 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
3739 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
3740 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
3748 // remove old routes...
3749 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
3751 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
3752 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
3755 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
3761 if (session
[s
].ip_pool_index
== -1) // static IP
3763 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
3765 else // It's part of the IP pool, remove it manually.
3766 uncache_ipmap(session
[s
].ip
);
3771 // add new routes...
3772 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
3774 if ((new->ip
& new->route
[i
].mask
) ==
3775 (new->route
[i
].ip
& new->route
[i
].mask
))
3778 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
3784 // If there's a new one, add it.
3785 if (new->ip_pool_index
== -1)
3787 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
3790 cache_ipmap(new->ip
, s
);
3795 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
3797 LOG(2, session
[s
].ip
, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
3801 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
3803 LOG(2, session
[s
].ip
, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
3804 new->filter_out
= 0;
3807 if (new->filter_in
!= session
[s
].filter_in
)
3809 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
3810 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
3813 if (new->filter_out
!= session
[s
].filter_out
)
3815 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
3816 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
3819 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
3820 // for walking the sessions to forward byte counts to the master.
3821 config
->cluster_highest_sessionid
= s
;
3823 // TEMP: old session struct used a u32 to define the throttle
3824 // speed for both up/down, new uses a u16 for each. Deal with
3825 // sessions from an old master for migration.
3826 if (new->throttle_out
== 0 && new->tbf_out
)
3827 new->throttle_out
= new->throttle_in
;
3829 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
3831 // Do fixups into address pool.
3832 if (new->ip_pool_index
!= -1)
3833 fix_address_pool(s
);
3838 static void initplugins()
3842 loaded_plugins
= ll_init();
3843 // Initialize the plugins to nothing
3844 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
3845 plugins
[i
] = ll_init();
3848 static void *open_plugin(char *plugin_name
, int load
)
3850 char path
[256] = "";
3852 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
3853 LOG(2, 0, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
3854 return dlopen(path
, RTLD_NOW
);
3857 // plugin callback to get a config value
3858 static void *getconfig(char *key
, enum config_typet type
)
3862 for (i
= 0; config_values
[i
].key
; i
++)
3864 if (!strcmp(config_values
[i
].key
, key
))
3866 if (config_values
[i
].type
== type
)
3867 return ((void *) config
) + config_values
[i
].offset
;
3869 LOG(1, 0, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
3870 key
, type
, config_values
[i
].type
);
3876 LOG(1, 0, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
3880 static int add_plugin(char *plugin_name
)
3882 static struct pluginfuncs funcs
= {
3887 sessiontbysessionidt
,
3888 sessionidtbysessiont
,
3894 cluster_send_session
,
3897 void *p
= open_plugin(plugin_name
, 1);
3898 int (*initfunc
)(struct pluginfuncs
*);
3903 LOG(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror());
3907 if (ll_contains(loaded_plugins
, p
))
3910 return 0; // already loaded
3914 int *v
= dlsym(p
, "plugin_api_version");
3915 if (!v
|| *v
!= PLUGIN_API_VERSION
)
3917 LOG(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
3923 if ((initfunc
= dlsym(p
, "plugin_init")))
3925 if (!initfunc(&funcs
))
3927 LOG(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
3933 ll_push(loaded_plugins
, p
);
3935 for (i
= 0; i
< max_plugin_functions
; i
++)
3938 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
3940 LOG(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
3941 ll_push(plugins
[i
], x
);
3945 LOG(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name
);
3949 static void run_plugin_done(void *plugin
)
3951 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
3957 static int remove_plugin(char *plugin_name
)
3959 void *p
= open_plugin(plugin_name
, 0);
3965 if (ll_contains(loaded_plugins
, p
))
3968 for (i
= 0; i
< max_plugin_functions
; i
++)
3971 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
3972 ll_delete(plugins
[i
], x
);
3975 ll_delete(loaded_plugins
, p
);
3981 LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name
);
3985 int run_plugins(int plugin_type
, void *data
)
3987 int (*func
)(void *data
);
3989 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
3990 return PLUGIN_RET_ERROR
;
3992 ll_reset(plugins
[plugin_type
]);
3993 while ((func
= ll_next(plugins
[plugin_type
])))
3997 if (r
!= PLUGIN_RET_OK
)
3998 return r
; // stop here
4001 return PLUGIN_RET_OK
;
4004 static void plugins_done()
4008 ll_reset(loaded_plugins
);
4009 while ((p
= ll_next(loaded_plugins
)))
4013 static void processcontrol(u8
* buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4015 struct nsctl request
;
4016 struct nsctl response
;
4017 int type
= unpack_control(&request
, buf
, len
);
4021 if (log_stream
&& config
->debug
>= 4)
4025 LOG(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Bogus control message (%d)\n", type
);
4029 LOG(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Received ");
4030 dump_control(&request
, log_stream
);
4036 case NSCTL_REQ_LOAD
:
4037 if (request
.argc
!= 1)
4039 response
.type
= NSCTL_RES_ERR
;
4041 response
.argv
[0] = "name of plugin required";
4043 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4045 response
.type
= NSCTL_RES_ERR
;
4047 response
.argv
[0] = !r
4048 ? "plugin already loaded"
4049 : "error loading plugin";
4053 response
.type
= NSCTL_RES_OK
;
4059 case NSCTL_REQ_UNLOAD
:
4060 if (request
.argc
!= 1)
4062 response
.type
= NSCTL_RES_ERR
;
4064 response
.argv
[0] = "name of plugin required";
4066 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4068 response
.type
= NSCTL_RES_ERR
;
4070 response
.argv
[0] = !r
4071 ? "plugin not loaded"
4072 : "plugin not found";
4076 response
.type
= NSCTL_RES_OK
;
4082 case NSCTL_REQ_HELP
:
4083 response
.type
= NSCTL_RES_OK
;
4086 ll_reset(loaded_plugins
);
4087 while ((p
= ll_next(loaded_plugins
)))
4089 char **help
= dlsym(p
, "plugin_control_help");
4090 while (response
.argc
< 0xff && help
&& *help
)
4091 response
.argv
[response
.argc
++] = *help
++;
4096 case NSCTL_REQ_CONTROL
:
4098 struct param_control param
= {
4099 config
->cluster_iam_master
,
4106 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4108 if (r
== PLUGIN_RET_ERROR
)
4110 response
.type
= NSCTL_RES_ERR
;
4112 response
.argv
[0] = param
.additional
4114 : "error returned by plugin";
4116 else if (r
== PLUGIN_RET_NOTMASTER
)
4118 static char msg
[] = "must be run on master: 000.000.000.000";
4120 response
.type
= NSCTL_RES_ERR
;
4122 if (config
->cluster_master_address
)
4124 strcpy(msg
+ 23, inet_toa(config
->cluster_master_address
));
4125 response
.argv
[0] = msg
;
4129 response
.argv
[0] = "must be run on master: none elected";
4132 else if (!(param
.response
& NSCTL_RESPONSE
))
4134 response
.type
= NSCTL_RES_ERR
;
4136 response
.argv
[0] = param
.response
4137 ? "unrecognised response value from plugin"
4138 : "unhandled action";
4142 response
.type
= param
.response
;
4144 if (param
.additional
)
4147 response
.argv
[0] = param
.additional
;
4155 response
.type
= NSCTL_RES_ERR
;
4157 response
.argv
[0] = "error unpacking control packet";
4160 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4163 LOG(2, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Failed to allocate nsctl response\n");
4167 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4170 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4171 if (log_stream
&& config
->debug
>= 4)
4173 LOG(4, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Sent ");
4174 dump_control(&response
, log_stream
);
4178 LOG(2, ntohl(addr
->sin_addr
.s_addr
), 0, 0, "Failed to pack nsctl response (%d)\n", r
);
4183 static tunnelidt
new_tunnel()
4186 for (i
= 1; i
< MAXTUNNEL
; i
++)
4188 if (tunnel
[i
].state
== TUNNELFREE
)
4190 LOG(4, 0, 0, i
, "Assigning tunnel ID %d\n", i
);
4191 if (i
> config
->cluster_highest_tunnelid
)
4192 config
->cluster_highest_tunnelid
= i
;
4196 LOG(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4201 // We're becoming the master. Do any required setup..
4203 // This is principally telling all the plugins that we're
4204 // now a master, and telling them about all the sessions
4205 // that are active too..
4207 void become_master(void)
4210 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4212 // running a bunch of iptables commands is slow and can cause
4213 // the master to drop tunnels on takeover--kludge around the
4214 // problem by forking for the moment (note: race)
4215 if (!fork_and_close())
4217 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4219 if (!session
[s
].tunnel
) // Not an in-use session.
4222 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4228 for (i
= 0; i
< config
->num_radfds
; i
++)
4230 FD_SET(radfds
[i
], &readset
);
4231 if (radfds
[i
] > readset_n
)
4232 readset_n
= radfds
[i
];
4236 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4242 if (CLI_HELP_REQUESTED
)
4243 return CLI_HELP_NO_ARGS
;
4246 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4248 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4251 if (!session
[s
].tunnel
)
4254 idle
= time_now
- session
[s
].last_packet
;
4255 idle
/= 5 ; // In multiples of 5 seconds.
4265 for (i
= 0; i
< 63; ++i
)
4267 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4269 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4270 cli_print(cli
, "%d total sessions open.", count
);
4274 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4280 if (CLI_HELP_REQUESTED
)
4281 return CLI_HELP_NO_ARGS
;
4284 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4286 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4289 if (!session
[s
].tunnel
)
4292 d
= time_now
- session
[s
].opened
;
4295 while (d
> 1 && open
< 32)
4305 for (i
= 0; i
< 30; ++i
)
4307 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4310 cli_print(cli
, "%d total sessions open.", count
);
4316 * This unencodes the AVP using the L2TP CHAP secret and the
4317 * previously stored random vector. It replaces the hidden data with
4318 * the cleartext data and returns the length of the cleartext data
4319 * (including the AVP "header" of 6 bytes).
4321 * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
4323 static int unhide_avp(u8
*avp
, tunnelidt t
, sessionidt s
, u16 length
)
4328 u8 working_vector
[16];
4329 uint16_t hidden_length
;
4334 // Find the AVP type.
4335 type
[0] = *(avp
+ 4);
4336 type
[1] = *(avp
+ 5);
4338 // Line up with the hidden data
4339 cursor
= output
= avp
+ 6;
4341 // Compute initial pad
4343 MD5Update(&ctx
, type
, 2);
4344 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4345 MD5Update(&ctx
, session
[s
].random_vector
, session
[s
].random_vector_length
);
4346 MD5Final(digest
, &ctx
);
4348 // Get hidden length
4349 hidden_length
= ((uint16_t) (digest
[0] ^ cursor
[0])) * 256 + (uint16_t) (digest
[1] ^ cursor
[1]);
4351 // Keep these for later use
4352 working_vector
[0] = *cursor
;
4353 working_vector
[1] = *(cursor
+ 1);
4356 if (hidden_length
> length
- 8)
4358 LOG(1, 0, s
, t
, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length
, (int) length
);
4362 /* Decrypt remainder */
4364 todo
= hidden_length
;
4367 working_vector
[done
] = *cursor
;
4368 *output
= digest
[done
] ^ *cursor
;
4373 if (done
== 16 && todo
)
4375 // Compute new digest
4378 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4379 MD5Update(&ctx
, &working_vector
, 16);
4380 MD5Final(digest
, &ctx
);
4384 return hidden_length
+ 6;
4387 static int ip_filter_port(ip_filter_portt
*p
, portt port
)
4391 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
4392 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
4393 case FILTER_PORT_OP_GT
: return port
> p
->port
;
4394 case FILTER_PORT_OP_LT
: return port
< p
->port
;
4395 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
4401 static int ip_filter_flag(u8 op
, u8 sflags
, u8 cflags
, u8 flags
)
4406 * NOTE: "match-any +A +B -C -D" is interpreted as "match if
4407 * either A or B is set *and* C or D is clear". While "or" is
4408 * possibly more correct, the way "established" is currently
4409 * implemented depends on this behaviour.
4411 case FILTER_FLAG_OP_ANY
:
4412 return (flags
& sflags
) && !(flags
& cflags
);
4414 case FILTER_FLAG_OP_ALL
:
4415 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
4421 int ip_filter(u8
*buf
, int len
, u8 filter
)
4429 ip_filter_rulet
*rule
;
4431 if (len
< 20) // up to end of destination address
4434 if (*buf
>> 4) // IPv4
4438 src_ip
= *(u32
*) (buf
+ 12);
4439 dst_ip
= *(u32
*) (buf
+ 16);
4441 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
4443 int l
= buf
[0] & 0xf;
4444 if (len
< l
+ 4) // ports
4447 src_port
= ntohs(*(u16
*) (buf
+ l
));
4448 dst_port
= ntohs(*(u16
*) (buf
+ l
+ 2));
4449 if (proto
== IPPROTO_TCP
)
4451 if (len
< l
+ 15) // flags
4454 flags
= buf
[l
+ 14] & 0x3f;
4458 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
4460 if (proto
&& proto
!= rule
->proto
)
4463 if (rule
->src_wild
!= INADDR_BROADCAST
&&
4464 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
4467 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
4468 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
4471 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
4473 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
4476 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
4479 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
4480 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
4485 return rule
->action
== FILTER_ACTION_PERMIT
;