3 // Copyright (c) 2003, 2004, 2005 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 1.114 2005-07-04 05:49:46 bodea Exp $";
13 #include <linux/if_tun.h>
18 #include <net/route.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
32 #include <sys/resource.h>
40 #include <sys/sysinfo.h>
48 #include "constants.h"
58 configt
*config
= NULL
; // all configuration
59 int tunfd
= -1; // tun interface file handle. (network device)
60 int udpfd
= -1; // UDP file handle
61 int controlfd
= -1; // Control signal handle
62 int clifd
= -1; // Socket listening for CLI connections.
63 int daefd
= -1; // Socket listening for DAE connections.
64 int snoopfd
= -1; // UDP file handle for sending out intercept data
65 int *radfds
= NULL
; // RADIUS requests file handles
66 int ifrfd
= -1; // File descriptor for routing, etc
67 int ifr6fd
= -1; // File descriptor for IPv6 routing, etc
68 int rand_fd
= -1; // Random data source
69 int cluster_sockfd
= -1; // Intra-cluster communications socket.
70 int epollfd
= -1; // event polling
71 time_t basetime
= 0; // base clock
72 char hostname
[1000] = ""; // us.
73 static int tunidx
; // ifr_ifindex of tun device
74 static int syslog_log
= 0; // are we logging to syslog
75 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id
= 0; // Unique ID for radius accounting
78 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
79 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
81 static void *ip_hash
[256]; // Mapping from IP address to session structures.
84 struct ipv6radix
*branch
;
85 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
88 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
89 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
92 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
93 time_t time_now
= 0; // Current time in seconds since epoch.
94 static char time_now_string
[64] = {0}; // Current time as a string.
95 char main_quit
= 0; // True if we're in the process of exiting.
96 linked_list
*loaded_plugins
;
97 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
99 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
100 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
102 config_descriptt config_values
[] = {
103 CONFIG("debug", debug
, INT
),
104 CONFIG("log_file", log_filename
, STRING
),
105 CONFIG("pid_file", pid_file
, STRING
),
106 CONFIG("random_device", random_device
, STRING
),
107 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
108 CONFIG("primary_dns", default_dns1
, IPv4
),
109 CONFIG("secondary_dns", default_dns2
, IPv4
),
110 CONFIG("primary_radius", radiusserver
[0], IPv4
),
111 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
112 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
113 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
114 CONFIG("radius_accounting", radius_accounting
, BOOL
),
115 CONFIG("radius_interim", radius_interim
, INT
),
116 CONFIG("radius_secret", radiussecret
, STRING
),
117 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
118 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
119 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
120 CONFIG("bind_address", bind_address
, IPv4
),
121 CONFIG("peer_address", peer_address
, IPv4
),
122 CONFIG("send_garp", send_garp
, BOOL
),
123 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
124 CONFIG("throttle_buckets", num_tbfs
, INT
),
125 CONFIG("accounting_dir", accounting_dir
, STRING
),
126 CONFIG("setuid", target_uid
, INT
),
127 CONFIG("dump_speed", dump_speed
, BOOL
),
128 CONFIG("multi_read_count", multi_read_count
, INT
),
129 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
130 CONFIG("lock_pages", lock_pages
, BOOL
),
131 CONFIG("icmp_rate", icmp_rate
, INT
),
132 CONFIG("packet_limit", max_packets
, INT
),
133 CONFIG("cluster_address", cluster_address
, IPv4
),
134 CONFIG("cluster_interface", cluster_interface
, STRING
),
135 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
136 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
137 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
138 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
142 static char *plugin_functions
[] = {
149 "plugin_new_session",
150 "plugin_kill_session",
152 "plugin_radius_response",
153 "plugin_radius_reset",
154 "plugin_become_master",
155 "plugin_new_session_master",
158 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
160 // Counters for shutdown sessions
161 static sessiont shut_acct
[8192];
162 static sessionidt shut_acct_n
= 0;
164 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
165 sessiont
*session
= NULL
; // Array of session structures.
166 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
167 radiust
*radius
= NULL
; // Array of radius structures.
168 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
169 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
170 static controlt
*controlfree
= 0;
171 struct Tstats
*_statistics
= NULL
;
173 struct Tringbuffer
*ringbuffer
= NULL
;
176 static void cache_ipmap(in_addr_t ip
, int s
);
177 static void uncache_ipmap(in_addr_t ip
);
178 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
179 static void free_ip_address(sessionidt s
);
180 static void dump_acct_info(int all
);
181 static void sighup_handler(int sig
);
182 static void sigalrm_handler(int sig
);
183 static void shutdown_handler(int sig
);
184 static void sigchild_handler(int sig
);
185 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
);
186 static void update_config(void);
187 static void read_config_file(void);
188 static void initplugins(void);
189 static int add_plugin(char *plugin_name
);
190 static int remove_plugin(char *plugin_name
);
191 static void plugins_done(void);
192 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
193 static tunnelidt
new_tunnel(void);
194 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
196 // on slaves, alow BGP to withdraw cleanly before exiting
199 // quit actions (master)
200 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
201 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
203 // return internal time (10ths since process startup), set f if given
204 static clockt
now(double *f
)
208 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
209 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
212 // work out a retry time based on try number
213 // This is a straight bounded exponential backoff.
214 // Maximum re-try time is 32 seconds. (2^5).
215 clockt
backoff(uint8_t try)
217 if (try > 5) try = 5; // max backoff
218 return now(NULL
) + 10 * (1 << try);
223 // Log a debug message. Typically called via the LOG macro
225 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
227 static char message
[65536] = {0};
233 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
234 ringbuffer
->tail
= 0;
235 if (ringbuffer
->tail
== ringbuffer
->head
)
236 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
237 ringbuffer
->head
= 0;
239 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
240 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
241 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
242 va_start(ap
, format
);
243 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
248 if (config
->debug
< level
) return;
250 va_start(ap
, format
);
251 vsnprintf(message
, sizeof(message
), format
, ap
);
254 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
256 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
261 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
264 const uint8_t *d
= (const uint8_t *) data
;
266 if (config
->debug
< level
) return;
268 // No support for _log_hex to syslog
271 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
272 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
274 for (i
= 0; i
< maxsize
; )
276 fprintf(log_stream
, "%4X: ", i
);
277 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
279 fprintf(log_stream
, "%02X ", d
[j
]);
281 fputs(": ", log_stream
);
284 for (; j
< i
+ 16; j
++)
286 fputs(" ", log_stream
);
288 fputs(": ", log_stream
);
291 fputs(" ", log_stream
);
292 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
294 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
295 fputc(d
[j
], log_stream
);
297 fputc('.', log_stream
);
300 fputs(" ", log_stream
);
304 fputs("\n", log_stream
);
308 setbuf(log_stream
, NULL
);
312 // update a counter, accumulating 2^32 wraps
313 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
315 uint32_t new = *counter
+ delta
;
322 // initialise the random generator
323 static void initrandom(char *source
)
325 static char path
[sizeof(config
->random_device
)] = "*undefined*";
327 // reinitialise only if we are forced to do so or if the config has changed
328 if (source
&& !strncmp(path
, source
, sizeof(path
)))
331 // close previous source, if any
340 snprintf(path
, sizeof(path
), "%s", source
);
344 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
346 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
347 path
, strerror(errno
));
352 // fill buffer with random data
353 void random_data(uint8_t *buf
, int len
)
360 n
= read(rand_fd
, buf
, len
);
361 if (n
>= len
) return;
366 LOG(0, 0, 0, "Error reading from random source: %s\n",
369 // fall back to rand()
377 // append missing data
379 // not using the low order bits from the prng stream
380 buf
[n
++] = (rand() >> 4) & 0xff;
385 // This adds it to the routing table, advertises it
386 // via BGP if enabled, and stuffs it into the
387 // 'sessionbyip' cache.
389 // 'ip' and 'mask' must be in _host_ order.
391 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
396 if (!mask
) mask
= 0xffffffff;
398 ip
&= mask
; // Force the ip to be the first one in the route.
400 memset(&r
, 0, sizeof(r
));
401 r
.rt_dev
= config
->tundevice
;
402 r
.rt_dst
.sa_family
= AF_INET
;
403 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
404 r
.rt_gateway
.sa_family
= AF_INET
;
405 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
406 r
.rt_genmask
.sa_family
= AF_INET
;
407 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
408 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
410 r
.rt_flags
|= RTF_GATEWAY
;
411 else if (mask
== 0xffffffff)
412 r
.rt_flags
|= RTF_HOST
;
414 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
415 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
416 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
418 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
419 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
423 bgp_add_route(htonl(ip
), htonl(mask
));
425 bgp_del_route(htonl(ip
), htonl(mask
));
428 // Add/Remove the IPs to the 'sessionbyip' cache.
429 // Note that we add the zero address in the case of
430 // a network route. Roll on CIDR.
432 // Note that 's == 0' implies this is the address pool.
433 // We still cache it here, because it will pre-fill
434 // the malloc'ed tree.
438 if (!add
) // Are we deleting a route?
439 s
= 0; // Caching the session as '0' is the same as uncaching.
441 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
446 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
449 char ipv6addr
[INET6_ADDRSTRLEN
];
453 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
457 memset(&rt
, 0, sizeof(rt
));
459 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
460 rt
.rtmsg_dst_len
= prefixlen
;
462 rt
.rtmsg_flags
= RTF_UP
;
463 rt
.rtmsg_ifindex
= tunidx
;
465 LOG(1, 0, 0, "Route %s %s/%d\n",
467 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
470 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
471 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
474 // FIXME: need to add BGP routing (RFC2858)
478 if (!add
) // Are we deleting a route?
479 s
= 0; // Caching the session as '0' is the same as uncaching.
481 cache_ipv6map(ip
, prefixlen
, s
);
487 // defined in linux/ipv6.h, but tricky to include from user-space
488 // TODO: move routing to use netlink rather than ioctl
490 struct in6_addr ifr6_addr
;
491 __u32 ifr6_prefixlen
;
492 unsigned int ifr6_ifindex
;
496 // Set up TUN interface
497 static void inittun(void)
500 struct in6_ifreq ifr6
;
501 struct sockaddr_in sin
= {0};
502 memset(&ifr
, 0, sizeof(ifr
));
503 ifr
.ifr_flags
= IFF_TUN
;
505 tunfd
= open(TUNDEVICE
, O_RDWR
);
508 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
512 int flags
= fcntl(tunfd
, F_GETFL
, 0);
513 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
515 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
517 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
520 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
521 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
522 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
524 sin
.sin_family
= AF_INET
;
525 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
526 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
528 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
530 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
533 /* Bump up the qlen to deal with bursts from the network */
535 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
537 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
540 ifr
.ifr_flags
= IFF_UP
;
541 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
543 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
546 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
548 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
551 tunidx
= ifr
.ifr_ifindex
;
553 // Only setup IPv6 on the tun device if we have a configured prefix
554 if (config
->ipv6_prefix
.s6_addr
[0] > 0) {
555 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
557 // Link local address is FE80::1
558 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
559 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
560 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
561 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
562 ifr6
.ifr6_prefixlen
= 64;
563 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
564 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
566 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
567 " %s\n", strerror(errno
));
570 // Global address is prefix::1
571 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
572 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
573 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
574 ifr6
.ifr6_prefixlen
= 64;
575 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
576 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
578 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
585 static void initudp(void)
588 struct sockaddr_in addr
;
591 memset(&addr
, 0, sizeof(addr
));
592 addr
.sin_family
= AF_INET
;
593 addr
.sin_port
= htons(L2TPPORT
);
594 addr
.sin_addr
.s_addr
= config
->bind_address
;
595 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
596 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
598 int flags
= fcntl(udpfd
, F_GETFL
, 0);
599 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
601 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
603 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
608 memset(&addr
, 0, sizeof(addr
));
609 addr
.sin_family
= AF_INET
;
610 addr
.sin_port
= htons(NSCTL_PORT
);
611 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
612 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
613 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
615 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
619 // Dynamic Authorization Extensions to RADIUS
620 memset(&addr
, 0, sizeof(addr
));
621 addr
.sin_family
= AF_INET
;
622 addr
.sin_port
= htons(config
->radius_dae_port
);
623 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
624 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
625 if (bind(daefd
, (void *) &addr
, sizeof(addr
)) < 0)
627 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
632 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
636 // Find session by IP, < 1 for not found
638 // Confusingly enough, this 'ip' must be
639 // in _network_ order. This being the common
640 // case when looking it up from IP packet headers.
642 // We actually use this cache for two things.
643 // #1. For used IP addresses, this maps to the
644 // session ID that it's used by.
645 // #2. For un-used IP addresses, this maps to the
646 // index into the pool table that contains that
650 static int lookup_ipmap(in_addr_t ip
)
652 uint8_t *a
= (uint8_t *) &ip
;
653 uint8_t **d
= (uint8_t **) ip_hash
;
655 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
656 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
657 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
659 return (int) (intptr_t) d
[(size_t) *a
];
662 static int lookup_ipv6map(struct in6_addr ip
)
664 struct ipv6radix
*curnode
;
667 char ipv6addr
[INET6_ADDRSTRLEN
];
669 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
673 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
675 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
680 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
681 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
688 sessionidt
sessionbyip(in_addr_t ip
)
690 int s
= lookup_ipmap(ip
);
693 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
694 return (sessionidt
) s
;
699 sessionidt
sessionbyipv6(struct in6_addr ip
)
702 CSTAT(sessionbyipv6
);
704 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
705 (ip
.s6_addr
[0] == 0xFE && ip
.s6_addr
[1] == 0x80 &&
706 (ip
.s6_addr16
[1] == ip
.s6_addr16
[2] == ip
.s6_addr16
[3] == 0))) {
707 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
709 s
= lookup_ipv6map(ip
);
712 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
719 // Take an IP address in HOST byte order and
720 // add it to the sessionid by IP cache.
722 // (It's actually cached in network order)
724 static void cache_ipmap(in_addr_t ip
, int s
)
726 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
727 uint8_t *a
= (uint8_t *) &nip
;
728 uint8_t **d
= (uint8_t **) ip_hash
;
731 for (i
= 0; i
< 3; i
++)
733 if (!d
[(size_t) a
[i
]])
735 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
739 d
= (uint8_t **) d
[(size_t) a
[i
]];
742 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
745 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
748 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
749 // else a map to an ip pool index.
752 static void uncache_ipmap(in_addr_t ip
)
754 cache_ipmap(ip
, 0); // Assign it to the NULL session.
757 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
761 struct ipv6radix
*curnode
;
762 char ipv6addr
[INET6_ADDRSTRLEN
];
764 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
766 bytes
= prefixlen
>> 3;
769 if (curnode
->branch
== NULL
)
771 if (!(curnode
->branch
= calloc(256,
772 sizeof (struct ipv6radix
))))
775 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
782 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
783 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
787 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
788 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
794 // CLI list to dump current ipcache.
796 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
798 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
802 if (CLI_HELP_REQUESTED
)
803 return CLI_HELP_NO_ARGS
;
805 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
807 for (i
= 0; i
< 256; ++i
)
812 for (j
= 0; j
< 256; ++j
)
817 for (k
= 0; k
< 256; ++k
)
822 for (l
= 0; l
< 256; ++l
)
826 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
832 cli_print(cli
, "%d entries in cache", count
);
837 // Find session by username, 0 for not found
838 // walled garden users aren't authenticated, so the username is
839 // reasonably useless. Ignore them to avoid incorrect actions
841 // This is VERY inefficent. Don't call it often. :)
843 sessionidt
sessionbyuser(char *username
)
846 CSTAT(sessionbyuser
);
848 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
850 if (!session
[s
].opened
)
853 if (session
[s
].walled_garden
)
854 continue; // Skip walled garden users.
856 if (!strncmp(session
[s
].user
, username
, 128))
860 return 0; // Not found.
863 void send_garp(in_addr_t ip
)
869 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
872 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
875 memset(&ifr
, 0, sizeof(ifr
));
876 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
877 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
879 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
883 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
884 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
886 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
891 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
894 static sessiont
*sessiontbysessionidt(sessionidt s
)
896 if (!s
|| s
>= MAXSESSION
) return NULL
;
900 static sessionidt
sessionidtbysessiont(sessiont
*s
)
902 sessionidt val
= s
-session
;
903 if (s
< session
|| val
>= MAXSESSION
) return 0;
907 // actually send a control message for a specific tunnel
908 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
910 struct sockaddr_in addr
;
916 static int backtrace_count
= 0;
917 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
918 STAT(tunnel_tx_errors
);
919 log_backtrace(backtrace_count
, 5)
925 static int backtrace_count
= 0;
926 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
927 log_backtrace(backtrace_count
, 5)
928 STAT(tunnel_tx_errors
);
932 memset(&addr
, 0, sizeof(addr
));
933 addr
.sin_family
= AF_INET
;
934 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
935 addr
.sin_port
= htons(tunnel
[t
].port
);
937 // sequence expected, if sequence in message
938 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
940 // If this is a control message, deal with retries
943 tunnel
[t
].last
= time_now
; // control message sent
944 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
945 if (tunnel
[t
].try > 1)
947 STAT(tunnel_retries
);
948 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
952 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
954 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
955 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
956 STAT(tunnel_tx_errors
);
960 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
961 STAT(tunnel_tx_packets
);
962 INC_STAT(tunnel_tx_bytes
, l
);
966 // Tiny helper function to write data to
969 int tun_write(uint8_t * data
, int size
)
971 return write(tunfd
, data
, size
);
974 // process outgoing (to tunnel) IP
976 static void processipout(uint8_t * buf
, int len
)
983 char *data
= buf
; // Keep a copy of the originals.
986 uint8_t b
[MAXETHER
+ 20];
990 if (len
< MIN_IP_SIZE
)
992 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
998 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1003 // Skip the tun header
1007 // Got an IP header now
1008 if (*(uint8_t *)(buf
) >> 4 != 4)
1010 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1014 ip
= *(uint32_t *)(buf
+ 16);
1015 if (!(s
= sessionbyip(ip
)))
1017 // Is this a packet for a session that doesn't exist?
1018 static int rate
= 0; // Number of ICMP packets we've sent this second.
1019 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1021 if (last
!= time_now
)
1027 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1029 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1030 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1031 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1035 t
= session
[s
].tunnel
;
1038 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1039 if (config
->max_packets
> 0)
1041 if (sess_local
[s
].last_packet_out
== TIME
)
1043 int max
= config
->max_packets
;
1045 // All packets for throttled sessions are handled by the
1046 // master, so further limit by using the throttle rate.
1047 // A bit of a kludge, since throttle rate is in kbps,
1048 // but should still be generous given our average DSL
1049 // packet size is 200 bytes: a limit of 28kbps equates
1050 // to around 180 packets per second.
1051 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1052 max
= sp
->throttle_out
;
1054 if (++sess_local
[s
].packets_out
> max
)
1056 sess_local
[s
].packets_dropped
++;
1062 if (sess_local
[s
].packets_dropped
)
1064 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1065 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1066 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1067 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1071 sess_local
[s
].last_packet_out
= TIME
;
1072 sess_local
[s
].packets_out
= 1;
1073 sess_local
[s
].packets_dropped
= 0;
1077 // run access-list if any
1078 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1083 // Are we throttling this session?
1084 if (config
->cluster_iam_master
)
1085 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1087 master_throttle_packet(sp
->tbf_out
, data
, size
);
1090 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1092 // We are walled-gardening this
1093 master_garden_packet(s
, data
, size
);
1097 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1099 // Add on L2TP header
1101 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1103 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1106 // Snooping this session, send it to intercept box
1107 if (sp
->snoop_ip
&& sp
->snoop_port
)
1108 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1110 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1111 sp
->cout_delta
+= len
;
1115 sess_local
[s
].cout
+= len
; // To send to master..
1116 sess_local
[s
].pout
++;
1119 // process outgoing (to tunnel) IPv6
1121 static void processipv6out(uint8_t * buf
, int len
)
1127 struct in6_addr ip6
;
1129 char *data
= buf
; // Keep a copy of the originals.
1132 uint8_t b
[MAXETHER
+ 20];
1134 CSTAT(processipv6out
);
1136 if (len
< MIN_IP_SIZE
)
1138 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1139 STAT(tunnel_tx_errors
);
1142 if (len
>= MAXETHER
)
1144 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1145 STAT(tunnel_tx_errors
);
1149 // Skip the tun header
1153 // Got an IP header now
1154 if (*(uint8_t *)(buf
) >> 4 != 6)
1156 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1160 ip6
= *(struct in6_addr
*)(buf
+24);
1161 s
= sessionbyipv6(ip6
);
1165 ip
= *(uint32_t *)(buf
+ 32);
1166 s
= sessionbyip(ip
);
1171 // Is this a packet for a session that doesn't exist?
1172 static int rate
= 0; // Number of ICMP packets we've sent this second.
1173 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1175 if (last
!= time_now
)
1181 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1183 // FIXME: Should send icmp6 host unreachable
1187 t
= session
[s
].tunnel
;
1190 // FIXME: add DoS prevention/filters?
1194 // Are we throttling this session?
1195 if (config
->cluster_iam_master
)
1196 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1198 master_throttle_packet(sp
->tbf_out
, data
, size
);
1201 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1203 // We are walled-gardening this
1204 master_garden_packet(s
, data
, size
);
1208 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1210 // Add on L2TP header
1212 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIPV6
);
1214 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1217 // Snooping this session, send it to intercept box
1218 if (sp
->snoop_ip
&& sp
->snoop_port
)
1219 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1221 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1222 sp
->cout_delta
+= len
;
1226 sess_local
[s
].cout
+= len
; // To send to master..
1227 sess_local
[s
].pout
++;
1231 // Helper routine for the TBF filters.
1232 // Used to send queued data in to the user!
1234 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1240 uint8_t b
[MAXETHER
+ 20];
1242 if (len
< 0 || len
> MAXETHER
)
1244 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1248 // Skip the tun header
1252 ip
= *(in_addr_t
*)(buf
+ 16);
1257 t
= session
[s
].tunnel
;
1260 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1262 // Add on L2TP header
1264 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1266 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1269 // Snooping this session.
1270 if (sp
->snoop_ip
&& sp
->snoop_port
)
1271 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1273 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1274 sp
->cout_delta
+= len
;
1278 sess_local
[s
].cout
+= len
; // To send to master..
1279 sess_local
[s
].pout
++;
1282 // add an AVP (16 bit)
1283 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1285 uint16_t l
= (m
? 0x8008 : 0x0008);
1286 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1287 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1288 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1289 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1293 // add an AVP (32 bit)
1294 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1296 uint16_t l
= (m
? 0x800A : 0x000A);
1297 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1298 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1299 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1300 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1304 // add an AVP (string)
1305 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1307 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1308 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1309 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1310 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1311 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1312 c
->length
+= 6 + strlen(val
);
1316 static void controlb(controlt
* c
, uint16_t avp
, char *val
, unsigned int len
, uint8_t m
)
1318 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1319 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1320 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1321 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1322 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1323 c
->length
+= 6 + len
;
1326 // new control connection
1327 static controlt
*controlnew(uint16_t mtype
)
1331 c
= malloc(sizeof(controlt
));
1335 controlfree
= c
->next
;
1339 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1341 control16(c
, 0, mtype
, 1);
1345 // send zero block if nothing is waiting
1347 static void controlnull(tunnelidt t
)
1350 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1353 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1354 *(uint16_t *) (buf
+ 2) = htons(12); // length
1355 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1356 *(uint16_t *) (buf
+ 6) = htons(0); // session
1357 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1358 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1359 tunnelsend(buf
, 12, t
);
1362 // add a control message to a tunnel, and send if within window
1363 static void controladd(controlt
* c
, tunnelidt t
, sessionidt far
)
1365 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1366 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1367 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1368 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1369 tunnel
[t
].ns
++; // advance sequence
1370 // link in message in to queue
1371 if (tunnel
[t
].controlc
)
1372 tunnel
[t
].controle
->next
= c
;
1374 tunnel
[t
].controls
= c
;
1376 tunnel
[t
].controle
= c
;
1377 tunnel
[t
].controlc
++;
1379 // send now if space in window
1380 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1382 tunnel
[t
].try = 0; // first send
1383 tunnelsend(c
->buf
, c
->length
, t
);
1388 // Throttle or Unthrottle a session
1390 // Throttle the data from/to through a session to no more than
1391 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1394 // If either value is -1, the current value is retained for that
1397 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1399 if (!session
[s
].opened
)
1400 return; // No-one home.
1402 if (!*session
[s
].user
)
1403 return; // User not logged in
1407 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1408 if (session
[s
].tbf_in
)
1409 free_tbf(session
[s
].tbf_in
);
1412 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1414 session
[s
].tbf_in
= 0;
1416 session
[s
].throttle_in
= rate_in
;
1421 int bytes
= rate_out
* 1024 / 8;
1422 if (session
[s
].tbf_out
)
1423 free_tbf(session
[s
].tbf_out
);
1426 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1428 session
[s
].tbf_out
= 0;
1430 session
[s
].throttle_out
= rate_out
;
1434 // add/remove filters from session (-1 = no change)
1435 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1437 if (!session
[s
].opened
)
1438 return; // No-one home.
1440 if (!*session
[s
].user
)
1441 return; // User not logged in
1444 if (filter_in
> MAXFILTER
) filter_in
= -1;
1445 if (filter_out
> MAXFILTER
) filter_out
= -1;
1446 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1447 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1451 if (session
[s
].filter_in
)
1452 ip_filters
[session
[s
].filter_in
- 1].used
--;
1455 ip_filters
[filter_in
- 1].used
++;
1457 session
[s
].filter_in
= filter_in
;
1460 if (filter_out
>= 0)
1462 if (session
[s
].filter_out
)
1463 ip_filters
[session
[s
].filter_out
- 1].used
--;
1466 ip_filters
[filter_out
- 1].used
++;
1468 session
[s
].filter_out
= filter_out
;
1472 // start tidy shutdown of session
1473 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1475 int walled_garden
= session
[s
].walled_garden
;
1478 CSTAT(sessionshutdown
);
1480 if (!session
[s
].opened
)
1482 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1483 return; // not a live session
1486 if (!session
[s
].die
)
1488 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1489 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1490 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1493 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1495 // RADIUS Stop message
1496 uint16_t r
= sess_local
[s
].radius
;
1502 // stop, if not already trying
1503 if (radius
[r
].state
!= RADIUSSTOP
)
1504 radiussend(r
, RADIUSSTOP
);
1507 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1509 // Save counters to dump to accounting file
1510 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1511 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1515 { // IP allocated, clear and unroute
1518 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1520 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1521 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1524 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1525 session
[s
].route
[r
].ip
= 0;
1528 if (session
[s
].ip_pool_index
== -1) // static ip
1530 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1536 // unroute IPv6, if setup
1537 if (session
[s
].flags
& SF_IPV6_ROUTED
)
1538 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1541 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1542 throttle_session(s
, 0, 0);
1546 controlt
*c
= controlnew(14); // sending CDN
1550 *(uint16_t *) buf
= htons(result
);
1551 *(uint16_t *) (buf
+2) = htons(error
);
1552 controlb(c
, 1, buf
, 4, 1);
1555 control16(c
, 1, result
, 1);
1557 control16(c
, 14, s
, 1); // assigned session (our end)
1558 controladd(c
, session
[s
].tunnel
, session
[s
].far
); // send the message
1561 if (!session
[s
].die
)
1562 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1564 // update filter refcounts
1565 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1566 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1568 cluster_send_session(s
);
1571 void sendipcp(tunnelidt t
, sessionidt s
)
1573 uint8_t buf
[MAXCONTROL
];
1574 uint16_t r
= sess_local
[s
].radius
;
1584 sessionshutdown(s
, "No free RADIUS sessions for IPCP", 3, 0);
1588 if (radius
[r
].state
!= RADIUSIPCP
)
1590 radius
[r
].state
= RADIUSIPCP
;
1594 radius
[r
].retry
= backoff(radius
[r
].try++);
1595 if (radius
[r
].try > 10)
1597 radiusclear(r
, s
); // Clear radius session.
1598 sessionshutdown(s
, "No reply to IPCP.", 3, 0);
1602 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1606 q
[1] = r
>> RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1607 *(uint16_t *) (q
+ 2) = htons(10);
1610 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1611 config
->bind_address
? config
->bind_address
:
1612 my_address
; // send my IP
1614 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1615 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1617 // If we have an IPv6 prefix length configured, assume we should
1618 // try to negotiate an IPv6 session as well. Unless we've had a
1619 // (N)ACK for IPV6CP.
1620 if (config
->ipv6_prefix
.s6_addr
[0] > 0 &&
1621 !(session
[s
].flags
& SF_IPV6CP_ACKED
) &&
1622 !(session
[s
].flags
& SF_IPV6_NACKED
))
1624 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1628 q
[1] = r
>> RADIUS_SHIFT
; // ID, don't care, we
1629 // only send one type
1631 *(uint16_t *) (q
+ 2) = htons(14);
1634 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1635 *(uint32_t *) (q
+ 10) = 0;
1638 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1642 static void sessionclear(sessionidt s
)
1644 memset(&session
[s
], 0, sizeof(session
[s
]));
1645 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1646 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1648 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1649 session
[s
].next
= sessionfree
;
1653 // kill a session now
1654 void sessionkill(sessionidt s
, char *reason
)
1659 if (!session
[s
].opened
) // not alive
1662 if (session
[s
].next
)
1664 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1668 session
[s
].die
= TIME
;
1669 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1670 if (sess_local
[s
].radius
)
1671 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1673 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1675 cluster_send_session(s
);
1678 static void tunnelclear(tunnelidt t
)
1681 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1682 tunnel
[t
].state
= TUNNELFREE
;
1685 // kill a tunnel now
1686 static void tunnelkill(tunnelidt t
, char *reason
)
1693 tunnel
[t
].state
= TUNNELDIE
;
1695 // free control messages
1696 while ((c
= tunnel
[t
].controls
))
1698 controlt
* n
= c
->next
;
1699 tunnel
[t
].controls
= n
;
1700 tunnel
[t
].controlc
--;
1701 c
->next
= controlfree
;
1705 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1706 if (session
[s
].tunnel
== t
)
1707 sessionkill(s
, reason
);
1711 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1712 cli_tunnel_actions
[t
].action
= 0;
1713 cluster_send_tunnel(t
);
1716 // shut down a tunnel cleanly
1717 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1721 CSTAT(tunnelshutdown
);
1723 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1725 // never set up, can immediately kill
1726 tunnelkill(t
, reason
);
1729 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1732 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1733 if (session
[s
].tunnel
== t
)
1734 sessionshutdown(s
, reason
, 0, 0);
1736 tunnel
[t
].state
= TUNNELDIE
;
1737 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1738 cluster_send_tunnel(t
);
1739 // TBA - should we wait for sessions to stop?
1742 controlt
*c
= controlnew(4); // sending StopCCN
1747 *(uint16_t *) buf
= htons(result
);
1748 *(uint16_t *) (buf
+2) = htons(error
);
1751 int m
= strlen(msg
);
1752 if (m
+ 4 > sizeof(buf
))
1753 m
= sizeof(buf
) - 4;
1755 memcpy(buf
+4, msg
, m
);
1759 controlb(c
, 1, buf
, l
, 1);
1762 control16(c
, 1, result
, 1);
1764 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1765 controladd(c
, t
, 0); // send the message
1769 // read and process packet on tunnel (UDP)
1770 void processudp(uint8_t * buf
, int len
, struct sockaddr_in
*addr
)
1772 char *chapresponse
= NULL
;
1773 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1774 uint8_t *p
= buf
+ 2;
1781 LOG_HEX(5, "UDP Data", buf
, len
);
1782 STAT(tunnel_rx_packets
);
1783 INC_STAT(tunnel_rx_bytes
, len
);
1786 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1787 STAT(tunnel_rx_errors
);
1790 if ((buf
[1] & 0x0F) != 2)
1792 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1793 STAT(tunnel_rx_errors
);
1798 l
= ntohs(*(uint16_t *) p
);
1801 t
= ntohs(*(uint16_t *) p
);
1803 s
= ntohs(*(uint16_t *) p
);
1805 if (s
>= MAXSESSION
)
1807 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1808 STAT(tunnel_rx_errors
);
1813 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1814 STAT(tunnel_rx_errors
);
1819 ns
= ntohs(*(uint16_t *) p
);
1821 nr
= ntohs(*(uint16_t *) p
);
1826 uint16_t o
= ntohs(*(uint16_t *) p
);
1831 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1832 STAT(tunnel_rx_errors
);
1838 uint16_t message
= 0xFFFF; // message type
1840 uint8_t mandatory
= 0;
1841 uint8_t authtype
= 0; // proxy auth type
1842 uint16_t asession
= 0; // assigned session
1843 uint32_t amagic
= 0; // magic number
1844 uint8_t aflags
= 0; // flags from last LCF
1845 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1846 char called
[MAXTEL
] = ""; // called number
1847 char calling
[MAXTEL
] = ""; // calling number
1849 if (!config
->cluster_iam_master
)
1851 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1855 // control messages must have bits 0x80|0x40|0x08
1856 // (type, length and sequence) set, and bits 0x02|0x01
1857 // (offset and priority) clear
1858 if ((*buf
& 0xCB) != 0xC8)
1860 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1861 STAT(tunnel_rx_errors
);
1865 // check for duplicate tunnel open message
1871 // Is this a duplicate of the first packet? (SCCRQ)
1873 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1875 if (tunnel
[i
].state
!= TUNNELOPENING
||
1876 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1877 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1880 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1885 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1886 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1888 // if no tunnel specified, assign one
1891 if (!(t
= new_tunnel()))
1893 LOG(1, 0, 0, "No more tunnels\n");
1894 STAT(tunnel_overflow
);
1898 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1899 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1900 tunnel
[t
].window
= 4; // default window
1901 STAT(tunnel_created
);
1902 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1903 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1906 // If the 'ns' just received is not the 'nr' we're
1907 // expecting, just send an ack and drop it.
1909 // if 'ns' is less, then we got a retransmitted packet.
1910 // if 'ns' is greater than missed a packet. Either way
1911 // we should ignore it.
1912 if (ns
!= tunnel
[t
].nr
)
1914 // is this the sequence we were expecting?
1915 STAT(tunnel_rx_errors
);
1916 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1917 t
, ns
, tunnel
[t
].nr
);
1919 if (l
) // Is this not a ZLB?
1924 // This is used to time out old tunnels
1925 tunnel
[t
].lastrec
= time_now
;
1927 // check sequence of this message
1929 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1930 // some to clear maybe?
1931 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1933 controlt
*c
= tunnel
[t
].controls
;
1934 tunnel
[t
].controls
= c
->next
;
1935 tunnel
[t
].controlc
--;
1936 c
->next
= controlfree
;
1939 tunnel
[t
].try = 0; // we have progress
1942 // receiver advance (do here so quoted correctly in any sends below)
1943 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1944 if (skip
< 0) skip
= 0;
1945 if (skip
< tunnel
[t
].controlc
)
1947 // some control packets can now be sent that were previous stuck out of window
1948 int tosend
= tunnel
[t
].window
- skip
;
1949 controlt
*c
= tunnel
[t
].controls
;
1957 tunnel
[t
].try = 0; // first send
1958 tunnelsend(c
->buf
, c
->length
, t
);
1963 if (!tunnel
[t
].controlc
)
1964 tunnel
[t
].retry
= 0; // caught up
1967 { // if not a null message
1973 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1975 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1981 LOG(1, s
, t
, "Invalid length in AVP\n");
1982 STAT(tunnel_rx_errors
);
1987 if (flags
& 0x3C) // reserved bits, should be clear
1989 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1991 result
= 2; // general error
1992 error
= 3; // reserved field non-zero
1997 if (*(uint16_t *) (b
))
1999 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
2001 result
= 2; // general error
2002 error
= 6; // generic vendor-specific error
2003 msg
= "unsupported vendor-specific";
2007 mtype
= ntohs(*(uint16_t *) (b
));
2015 // handle hidden AVPs
2016 if (!*config
->l2tpsecret
)
2018 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2020 result
= 2; // general error
2021 error
= 6; // generic vendor-specific error
2022 msg
= "secret not specified";
2025 if (!session
[s
].random_vector_length
)
2027 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2029 result
= 2; // general error
2030 error
= 6; // generic
2031 msg
= "no random vector";
2036 LOG(2, s
, t
, "Short hidden AVP.\n");
2038 result
= 2; // general error
2039 error
= 2; // length is wrong
2045 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2047 orig_len
= ntohs(*(uint16_t *) b
);
2048 if (orig_len
> n
+ 2)
2050 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2054 result
= 2; // general error
2055 error
= 2; // length is wrong
2064 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, avp_name(mtype
), n
,
2065 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2069 case 0: // message type
2070 message
= ntohs(*(uint16_t *) b
);
2071 mandatory
= flags
& 0x80;
2072 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_message_type(message
));
2074 case 1: // result code
2076 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2077 const char* resdesc
= "(unknown)";
2080 resdesc
= stopccn_result_code(rescode
);
2082 else if (message
== 14)
2084 resdesc
= cdn_result_code(rescode
);
2087 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2090 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2091 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, error_code(errcode
));
2094 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2099 case 2: // protocol version
2101 version
= ntohs(*(uint16_t *) (b
));
2102 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2103 if (version
&& version
!= 0x0100)
2104 { // allow 0.0 and 1.0
2105 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2107 result
= 5; // unspported protocol version
2108 error
= 0x0100; // supported version
2114 case 3: // framing capabilities
2115 // LOG(4, s, t, "Framing capabilities\n");
2117 case 4: // bearer capabilities
2118 // LOG(4, s, t, "Bearer capabilities\n");
2120 case 5: // tie breaker
2121 // We never open tunnels, so we don't care about tie breakers
2122 // LOG(4, s, t, "Tie breaker\n");
2124 case 6: // firmware revision
2125 // LOG(4, s, t, "Firmware revision\n");
2127 case 7: // host name
2128 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2129 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2130 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2131 // TBA - to send to RADIUS
2133 case 8: // vendor name
2134 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2135 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2136 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2138 case 9: // assigned tunnel
2139 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2140 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2142 case 10: // rx window
2143 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2144 if (!tunnel
[t
].window
)
2145 tunnel
[t
].window
= 1; // window of 0 is silly
2146 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2148 case 11: // Challenge
2150 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2151 build_chap_response(b
, 2, n
, &chapresponse
);
2154 case 13: // Response
2155 // Why did they send a response? We never challenge.
2156 LOG(2, s
, t
, " received unexpected challenge response\n");
2159 case 14: // assigned session
2160 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2161 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2163 case 15: // call serial number
2164 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2166 case 18: // bearer type
2167 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2170 case 19: // framing type
2171 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2174 case 21: // called number
2175 memset(called
, 0, sizeof(called
));
2176 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2177 LOG(4, s
, t
, " Called <%s>\n", called
);
2179 case 22: // calling number
2180 memset(calling
, 0, sizeof(calling
));
2181 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2182 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2186 case 24: // tx connect speed
2189 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2193 // AS5300s send connect speed as a string
2195 memset(tmp
, 0, sizeof(tmp
));
2196 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2197 session
[s
].tx_connect_speed
= atol(tmp
);
2199 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2201 case 38: // rx connect speed
2204 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2208 // AS5300s send connect speed as a string
2210 memset(tmp
, 0, sizeof(tmp
));
2211 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2212 session
[s
].rx_connect_speed
= atol(tmp
);
2214 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2216 case 25: // Physical Channel ID
2218 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2219 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2222 case 29: // Proxy Authentication Type
2224 uint16_t atype
= ntohs(*(uint16_t *)b
);
2225 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, auth_type(atype
));
2227 authtype
= AUTHCHAP
;
2228 else if (atype
== 3)
2233 case 30: // Proxy Authentication Name
2236 memset(authname
, 0, sizeof(authname
));
2237 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2238 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2242 case 31: // Proxy Authentication Challenge
2244 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2245 if (sess_local
[s
].radius
)
2246 memcpy(radius
[sess_local
[s
].radius
].auth
, b
, 16);
2249 case 32: // Proxy Authentication ID
2251 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2252 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2253 if (sess_local
[s
].radius
)
2254 radius
[sess_local
[s
].radius
].id
= authid
;
2257 case 33: // Proxy Authentication Response
2258 LOG(4, s
, t
, " Proxy Auth Response\n");
2260 case 27: // last sent lcp
2261 { // find magic number
2262 uint8_t *p
= b
, *e
= p
+ n
;
2263 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2265 if (*p
== 5 && p
[1] == 6) // Magic-Number
2266 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2267 else if (*p
== 3 && p
[1] == 4 && *(uint16_t *) (p
+ 2) == htons(PPPPAP
)) // Authentication-Protocol (PAP)
2269 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol (CHAP)
2270 authtype
= AUTHCHAP
;
2271 else if (*p
== 7) // Protocol-Field-Compression
2272 aflags
|= SESSIONPFC
;
2273 else if (*p
== 8) // Address-and-Control-Field-Compression
2274 aflags
|= SESSIONACFC
;
2279 case 28: // last recv lcp confreq
2281 case 26: // Initial Received LCP CONFREQ
2283 case 39: // seq required - we control it as an LNS anyway...
2285 case 36: // Random Vector
2286 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2287 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2288 if (n
> sizeof(session
[s
].random_vector
))
2289 n
= sizeof(session
[s
].random_vector
);
2290 memcpy(session
[s
].random_vector
, b
, n
);
2291 session
[s
].random_vector_length
= n
;
2295 static char e
[] = "unknown AVP 0xXXXX";
2296 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2298 result
= 2; // general error
2299 error
= 8; // unknown mandatory AVP
2300 sprintf((msg
= e
) + 14, "%04x", mtype
);
2307 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2311 case 1: // SCCRQ - Start Control Connection Request
2312 tunnel
[t
].state
= TUNNELOPENING
;
2313 if (main_quit
!= QUIT_SHUTDOWN
)
2315 controlt
*c
= controlnew(2); // sending SCCRP
2316 control16(c
, 2, version
, 1); // protocol version
2317 control32(c
, 3, 3, 1); // framing
2318 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2319 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2320 control16(c
, 9, t
, 1); // assigned tunnel
2321 controladd(c
, t
, 0); // send the resply
2325 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2329 tunnel
[t
].state
= TUNNELOPEN
;
2332 tunnel
[t
].state
= TUNNELOPEN
;
2333 controlnull(t
); // ack
2336 controlnull(t
); // ack
2337 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2340 controlnull(t
); // simply ACK
2352 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2357 sessionfree
= session
[s
].next
;
2358 memset(&session
[s
], 0, sizeof(session
[s
]));
2360 if (s
> config
->cluster_highest_sessionid
)
2361 config
->cluster_highest_sessionid
= s
;
2363 // make a RADIUS session
2364 if ((r
= radiusnew(s
)))
2366 controlt
*c
= controlnew(11); // sending ICRP
2367 session
[s
].opened
= time_now
;
2368 session
[s
].tunnel
= t
;
2369 session
[s
].far
= asession
;
2370 session
[s
].last_packet
= time_now
;
2371 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2372 control16(c
, 14, s
, 1); // assigned session
2373 controladd(c
, t
, asession
); // send the reply
2375 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
2376 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2377 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2378 STAT(session_created
);
2383 LOG(1, s
, t
, "No free RADIUS sessions for ICRQ\n");
2388 STAT(session_overflow
);
2389 LOG(1, 0, t
, "No free sessions\n");
2393 controlt
*c
= controlnew(14); // CDN
2394 if (main_quit
== QUIT_SHUTDOWN
)
2395 control16(c
, 1, 2, 7); // try another
2397 control16(c
, 1, 4, 0); // temporary lack of resources
2399 controladd(c
, t
, asession
); // send the message
2406 if (amagic
== 0) amagic
= time_now
;
2407 session
[s
].magic
= amagic
; // set magic number
2408 session
[s
].l2tp_flags
= aflags
; // set flags received
2409 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2410 controlnull(t
); // ack
2411 // proxy authentication type is not supported
2412 if (!(config
->radius_authtypes
& authtype
))
2413 authtype
= config
->radius_authprefer
;
2416 sendlcp(t
, s
, authtype
);
2419 controlnull(t
); // ack
2420 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2423 LOG(1, s
, t
, "Missing message type\n");
2426 STAT(tunnel_rx_errors
);
2428 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2430 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2433 if (chapresponse
) free(chapresponse
);
2434 cluster_send_tunnel(t
);
2438 LOG(4, s
, t
, " Got a ZLB ack\n");
2445 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2446 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2447 { // HDLC address header, discard
2453 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2454 STAT(tunnel_rx_errors
);
2464 prot
= ntohs(*(uint16_t *) p
);
2469 if (s
&& !session
[s
].opened
) // Is something wrong??
2471 if (!config
->cluster_iam_master
)
2473 // Pass it off to the master to deal with..
2474 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2479 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2480 STAT(tunnel_rx_errors
);
2486 session
[s
].last_packet
= time_now
;
2487 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2488 processpap(t
, s
, p
, l
);
2490 else if (prot
== PPPCHAP
)
2492 session
[s
].last_packet
= time_now
;
2493 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2494 processchap(t
, s
, p
, l
);
2496 else if (prot
== PPPLCP
)
2498 session
[s
].last_packet
= time_now
;
2499 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2500 processlcp(t
, s
, p
, l
);
2502 else if (prot
== PPPIPCP
)
2504 session
[s
].last_packet
= time_now
;
2505 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2506 processipcp(t
, s
, p
, l
);
2508 else if (prot
== PPPIPV6CP
)
2510 if (config
->ipv6_prefix
.s6_addr
[0] > 0)
2512 session
[s
].last_packet
= time_now
;
2513 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2514 processipv6cp(t
, s
, p
, l
);
2518 LOG(1, s
, t
, "IPv6 not configured; ignoring IPv6CP\n");
2521 else if (prot
== PPPCCP
)
2523 session
[s
].last_packet
= time_now
;
2524 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2525 processccp(t
, s
, p
, l
);
2527 else if (prot
== PPPIP
)
2531 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2532 return; // closing session, PPP not processed
2535 session
[s
].last_packet
= time_now
;
2536 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2538 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2542 processipin(t
, s
, p
, l
);
2544 else if (prot
== PPPIPV6
)
2546 if (!config
->ipv6_prefix
.s6_addr
[0] > 0)
2548 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2553 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2554 return; // closing session, PPP not processed
2557 session
[s
].last_packet
= time_now
;
2558 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2560 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2564 processipv6in(t
, s
, p
, l
);
2568 STAT(tunnel_rx_errors
);
2569 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2574 // read and process packet on tun
2575 static void processtun(uint8_t * buf
, int len
)
2577 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2578 STAT(tun_rx_packets
);
2579 INC_STAT(tun_rx_bytes
, len
);
2587 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2588 STAT(tun_rx_errors
);
2592 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2593 processipout(buf
, len
);
2594 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2595 && config
->ipv6_prefix
.s6_addr
[0] > 0)
2596 processipv6out(buf
, len
);
2601 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2602 // that we look at the whole of the tunnel, radius and session tables
2604 static void regular_cleanups(double period
)
2606 // Next tunnel, radius and session to check for actions on.
2607 static tunnelidt t
= 0;
2609 static sessionidt s
= 0;
2622 // divide up tables into slices based on the last run
2623 t_slice
= config
->cluster_highest_tunnelid
* period
;
2624 r_slice
= (MAXRADIUS
- 1) * period
;
2625 s_slice
= config
->cluster_highest_sessionid
* period
;
2629 else if (t_slice
> config
->cluster_highest_tunnelid
)
2630 t_slice
= config
->cluster_highest_tunnelid
;
2634 else if (r_slice
> (MAXRADIUS
- 1))
2635 r_slice
= MAXRADIUS
- 1;
2639 else if (s_slice
> config
->cluster_highest_sessionid
)
2640 s_slice
= config
->cluster_highest_sessionid
;
2642 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2644 for (i
= 0; i
< t_slice
; i
++)
2647 if (t
> config
->cluster_highest_tunnelid
)
2650 // check for expired tunnels
2651 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2653 STAT(tunnel_timeout
);
2654 tunnelkill(t
, "Expired");
2658 // check for message resend
2659 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2661 // resend pending messages as timeout on reply
2662 if (tunnel
[t
].retry
<= TIME
)
2664 controlt
*c
= tunnel
[t
].controls
;
2665 uint8_t w
= tunnel
[t
].window
;
2666 tunnel
[t
].try++; // another try
2667 if (tunnel
[t
].try > 5)
2668 tunnelkill(t
, "Timeout on control message"); // game over
2672 tunnelsend(c
->buf
, c
->length
, t
);
2680 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2682 controlt
*c
= controlnew(6); // sending HELLO
2683 controladd(c
, t
, 0); // send the message
2684 LOG(3, 0, t
, "Sending HELLO message\n");
2688 // Check for tunnel changes requested from the CLI
2689 if ((a
= cli_tunnel_actions
[t
].action
))
2691 cli_tunnel_actions
[t
].action
= 0;
2692 if (a
& CLI_TUN_KILL
)
2694 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2695 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2701 for (i
= 0; i
< r_slice
; i
++)
2707 if (!radius
[r
].state
)
2710 if (radius
[r
].retry
<= TIME
)
2717 for (i
= 0; i
< s_slice
; i
++)
2720 if (s
> config
->cluster_highest_sessionid
)
2723 if (!session
[s
].opened
) // Session isn't in use
2726 // check for expired sessions
2729 if (session
[s
].die
<= TIME
)
2731 sessionkill(s
, "Expired");
2737 if (session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
)
2738 && !(sess_local
[s
].radius
&& radius
[sess_local
[s
].radius
].state
== RADIUSIPCP
))
2740 // IPCP has not completed yet. Resend
2741 LOG(3, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2742 sendipcp(session
[s
].tunnel
, s
);
2746 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2747 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2749 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2750 STAT(session_timeout
);
2755 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2756 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2758 uint8_t b
[MAXCONTROL
] = {0};
2760 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2764 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2765 *(uint16_t *)(q
+ 2) = htons(8); // Length
2766 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2768 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2769 (int)(time_now
- session
[s
].last_packet
));
2770 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2774 // Check for actions requested from the CLI
2775 if ((a
= cli_session_actions
[s
].action
))
2779 cli_session_actions
[s
].action
= 0;
2780 if (a
& CLI_SESS_KILL
)
2782 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2783 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2784 a
= 0; // dead, no need to check for other actions
2788 if (a
& CLI_SESS_NOSNOOP
)
2790 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2791 session
[s
].snoop_ip
= 0;
2792 session
[s
].snoop_port
= 0;
2796 else if (a
& CLI_SESS_SNOOP
)
2798 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2799 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2800 cli_session_actions
[s
].snoop_port
);
2802 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2803 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2808 if (a
& CLI_SESS_NOTHROTTLE
)
2810 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2811 throttle_session(s
, 0, 0);
2815 else if (a
& CLI_SESS_THROTTLE
)
2817 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2818 cli_session_actions
[s
].throttle_in
,
2819 cli_session_actions
[s
].throttle_out
);
2821 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2826 if (a
& CLI_SESS_NOFILTER
)
2828 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2829 filter_session(s
, 0, 0);
2833 else if (a
& CLI_SESS_FILTER
)
2835 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2836 cli_session_actions
[s
].filter_in
,
2837 cli_session_actions
[s
].filter_out
);
2839 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2845 cluster_send_session(s
);
2848 // RADIUS interim accounting
2849 if (config
->radius_accounting
&& config
->radius_interim
> 0
2850 && session
[s
].ip
&& !session
[s
].walled_garden
2851 && !sess_local
[s
].radius
// RADIUS already in progress
2852 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2854 int rad
= radiusnew(s
);
2857 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2858 STAT(radius_overflow
);
2862 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2863 session
[s
].user
, session
[s
].unique_id
);
2865 radiussend(rad
, RADIUSINTERIM
);
2866 sess_local
[s
].last_interim
= time_now
;
2871 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
2872 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
2876 // Are we in the middle of a tunnel update, or radius
2879 static int still_busy(void)
2882 static clockt last_talked
= 0;
2883 static clockt start_busy_wait
= 0;
2885 if (!config
->cluster_iam_master
)
2888 static time_t stopped_bgp
= 0;
2893 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
2895 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2896 if (bgp_peers
[i
].state
== Established
)
2897 bgp_stop(&bgp_peers
[i
]);
2899 stopped_bgp
= time_now
;
2901 // we don't want to become master
2902 cluster_send_ping(0);
2907 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
2915 if (main_quit
== QUIT_SHUTDOWN
)
2917 static int dropped
= 0;
2922 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
2923 for (i
= 1; i
< MAXTUNNEL
; i
++)
2924 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
2925 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
2931 if (start_busy_wait
== 0)
2932 start_busy_wait
= TIME
;
2934 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2936 if (!tunnel
[i
].controlc
)
2939 if (last_talked
!= TIME
)
2941 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
2947 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2948 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2950 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2954 for (i
= 1; i
< MAXRADIUS
; i
++)
2956 if (radius
[i
].state
== RADIUSNULL
)
2958 if (radius
[i
].state
== RADIUSWAIT
)
2961 if (last_talked
!= TIME
)
2963 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2973 # include <sys/epoll.h>
2975 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
2976 # include "fake_epoll.h"
2979 // the base set of fds polled: cli, cluster, tun, udp, control, dae
2982 // additional polled fds
2984 # define EXTRA_FDS BGP_NUM_PEERS
2986 # define EXTRA_FDS 0
2989 // main loop - gets packets on tun or udp and processes them
2990 static void mainloop(void)
2994 clockt next_cluster_ping
= 0; // send initial ping immediately
2995 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
2996 int maxevent
= sizeof(events
)/sizeof(*events
);
2998 if ((epollfd
= epoll_create(maxevent
)) < 0)
3000 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3004 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3005 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3007 /* setup our fds to poll for input */
3009 static struct event_data d
[BASE_FDS
];
3010 struct epoll_event e
;
3015 d
[i
].type
= FD_TYPE_CLI
;
3016 e
.data
.ptr
= &d
[i
++];
3017 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3019 d
[i
].type
= FD_TYPE_CLUSTER
;
3020 e
.data
.ptr
= &d
[i
++];
3021 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3023 d
[i
].type
= FD_TYPE_TUN
;
3024 e
.data
.ptr
= &d
[i
++];
3025 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3027 d
[i
].type
= FD_TYPE_UDP
;
3028 e
.data
.ptr
= &d
[i
++];
3029 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3031 d
[i
].type
= FD_TYPE_CONTROL
;
3032 e
.data
.ptr
= &d
[i
++];
3033 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3035 d
[i
].type
= FD_TYPE_DAE
;
3036 e
.data
.ptr
= &d
[i
++];
3037 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3041 signal(SIGPIPE
, SIG_IGN
);
3042 bgp_setup(config
->as_number
);
3043 if (config
->bind_address
)
3044 bgp_add_route(config
->bind_address
, 0xffffffff);
3046 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3048 if (config
->neighbour
[i
].name
[0])
3049 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3050 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3051 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3055 while (!main_quit
|| still_busy())
3060 if (config
->reload_config
)
3062 // Update the config state based on config settings
3070 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3071 STAT(select_called
);
3076 if (errno
== EINTR
||
3077 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3080 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3086 struct sockaddr_in addr
;
3090 int cluster_ready
= 0;
3093 int cluster_pkts
= 0;
3095 uint32_t bgp_events
[BGP_NUM_PEERS
];
3096 memset(bgp_events
, 0, sizeof(bgp_events
));
3099 for (c
= n
, i
= 0; i
< c
; i
++)
3101 struct event_data
*d
= events
[i
].data
.ptr
;
3104 case FD_TYPE_CLI
: // CLI connections
3108 alen
= sizeof(addr
);
3109 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3115 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3121 // these are handled below, with multiple interleaved reads
3122 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3123 case FD_TYPE_TUN
: tun_ready
++; break;
3124 case FD_TYPE_UDP
: udp_ready
++; break;
3126 case FD_TYPE_CONTROL
: // nsctl commands
3127 alen
= sizeof(addr
);
3128 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3132 case FD_TYPE_DAE
: // DAE requests
3133 alen
= sizeof(addr
);
3134 processdae(buf
, recvfrom(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3138 case FD_TYPE_RADIUS
: // RADIUS response
3139 s
= recv(radfds
[d
->index
], buf
, sizeof(buf
), 0);
3140 if (s
>= 0 && config
->cluster_iam_master
)
3141 processrad(buf
, s
, d
->index
);
3148 bgp_events
[d
->index
] = events
[i
].events
;
3154 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3159 bgp_process(bgp_events
);
3162 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3167 alen
= sizeof(addr
);
3168 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3170 processudp(buf
, s
, &addr
);
3183 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3198 alen
= sizeof(addr
);
3199 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3201 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3212 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3213 STAT(multi_read_used
);
3215 if (c
>= config
->multi_read_count
)
3217 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3218 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3220 STAT(multi_read_exceeded
);
3225 // Runs on every machine (master and slaves).
3226 if (next_cluster_ping
<= TIME
)
3228 // Check to see which of the cluster is still alive..
3230 cluster_send_ping(basetime
); // Only does anything if we're a slave
3231 cluster_check_master(); // ditto.
3233 cluster_heartbeat(); // Only does anything if we're a master.
3234 cluster_check_slaves(); // ditto.
3236 master_update_counts(); // If we're a slave, send our byte counters to our master.
3238 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3239 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3241 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3244 if (!config
->cluster_iam_master
)
3247 // Run token bucket filtering queue..
3248 // Only run it every 1/10th of a second.
3250 static clockt last_run
= 0;
3251 if (last_run
!= TIME
)
3258 // Handle timeouts, retries etc.
3260 static double last_clean
= 0;
3264 TIME
= now(&this_clean
);
3265 diff
= this_clean
- last_clean
;
3267 // Run during idle time (after we've handled
3268 // all incoming packets) or every 1/10th sec
3269 if (!more
|| diff
> 0.1)
3271 regular_cleanups(diff
);
3272 last_clean
= this_clean
;
3276 if (*config
->accounting_dir
)
3278 static clockt next_acct
= 0;
3279 static clockt next_shut_acct
= 0;
3281 if (next_acct
<= TIME
)
3283 // Dump accounting data
3284 next_acct
= TIME
+ ACCT_TIME
;
3285 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3288 else if (next_shut_acct
<= TIME
)
3290 // Dump accounting data for shutdown sessions
3291 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3298 // Are we the master and shutting down??
3299 if (config
->cluster_iam_master
)
3300 cluster_heartbeat(); // Flush any queued changes..
3302 // Ok. Notify everyone we're shutting down. If we're
3303 // the master, this will force an election.
3304 cluster_send_ping(0);
3307 // Important!!! We MUST not process any packets past this point!
3308 LOG(1, 0, 0, "Shutdown complete\n");
3311 static void stripdomain(char *host
)
3315 if ((p
= strchr(host
, '.')))
3321 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3327 while (fgets(buf
, sizeof(buf
), resolv
))
3329 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3332 if (!isspace(buf
[6]))
3336 while (isspace(*b
)) b
++;
3341 while (*b
&& !isspace(*b
)) b
++;
3343 if (buf
[0] == 'd') // domain is canonical
3349 // first search line
3352 // hold, may be subsequent domain line
3353 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3364 int hl
= strlen(host
);
3365 int dl
= strlen(domain
);
3366 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3367 host
[hl
-dl
- 1] = 0;
3371 *p
= 0; // everything after first dot
3376 // Init data structures
3377 static void initdata(int optdebug
, char *optconfig
)
3381 if (!(config
= shared_malloc(sizeof(configt
))))
3383 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3387 memset(config
, 0, sizeof(configt
));
3388 time(&config
->start_time
);
3389 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3390 config
->debug
= optdebug
;
3391 config
->num_tbfs
= MAXTBFS
;
3392 config
->rl_rate
= 28; // 28kbps
3393 config
->cluster_master_min_adv
= 1;
3394 strcpy(config
->random_device
, RANDOMDEVICE
);
3396 log_stream
= stderr
;
3399 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3401 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3404 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3407 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3409 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3412 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3414 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3417 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3419 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3423 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3425 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3429 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3431 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3435 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3437 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3441 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3443 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3446 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3448 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3450 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3453 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3455 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3457 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3460 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3462 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3463 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3464 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3465 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3467 // Put all the sessions on the free list marked as undefined.
3468 for (i
= 1; i
< MAXSESSION
; i
++)
3470 session
[i
].next
= i
+ 1;
3471 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3473 session
[MAXSESSION
- 1].next
= 0;
3476 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3477 for (i
= 1; i
< MAXTUNNEL
; i
++)
3478 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3482 // Grab my hostname unless it's been specified
3483 gethostname(hostname
, sizeof(hostname
));
3484 stripdomain(hostname
);
3487 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3490 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3492 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3498 static int assign_ip_address(sessionidt s
)
3502 time_t best_time
= time_now
;
3503 char *u
= session
[s
].user
;
3507 CSTAT(assign_ip_address
);
3509 for (i
= 1; i
< ip_pool_size
; i
++)
3511 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3514 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3521 if (ip_address_pool
[i
].last
< best_time
)
3524 if (!(best_time
= ip_address_pool
[i
].last
))
3525 break; // never used, grab this one
3531 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3535 session
[s
].ip
= ip_address_pool
[best
].address
;
3536 session
[s
].ip_pool_index
= best
;
3537 ip_address_pool
[best
].assigned
= 1;
3538 ip_address_pool
[best
].last
= time_now
;
3539 ip_address_pool
[best
].session
= s
;
3540 if (session
[s
].walled_garden
)
3541 /* Don't track addresses of users in walled garden (note: this
3542 means that their address isn't "sticky" even if they get
3544 ip_address_pool
[best
].user
[0] = 0;
3546 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3549 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3550 reuse
? "Reusing" : "Allocating", best
);
3555 static void free_ip_address(sessionidt s
)
3557 int i
= session
[s
].ip_pool_index
;
3560 CSTAT(free_ip_address
);
3563 return; // what the?
3565 if (i
< 0) // Is this actually part of the ip pool?
3569 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3571 ip_address_pool
[i
].assigned
= 0;
3572 ip_address_pool
[i
].session
= 0;
3573 ip_address_pool
[i
].last
= time_now
;
3577 // Fsck the address pool against the session table.
3578 // Normally only called when we become a master.
3580 // This isn't perfect: We aren't keep tracking of which
3581 // users used to have an IP address.
3583 void rebuild_address_pool(void)
3588 // Zero the IP pool allocation, and build
3589 // a map from IP address to pool index.
3590 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3592 ip_address_pool
[i
].assigned
= 0;
3593 ip_address_pool
[i
].session
= 0;
3594 if (!ip_address_pool
[i
].address
)
3597 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3600 for (i
= 0; i
< MAXSESSION
; ++i
)
3603 if (!(session
[i
].opened
&& session
[i
].ip
))
3606 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3608 if (session
[i
].ip_pool_index
< 0)
3610 // Not allocated out of the pool.
3611 if (ipid
< 1) // Not found in the pool either? good.
3614 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3615 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3617 // Fall through and process it as part of the pool.
3621 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3623 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3625 session
[i
].ip_pool_index
= ipid
;
3629 ip_address_pool
[ipid
].assigned
= 1;
3630 ip_address_pool
[ipid
].session
= i
;
3631 ip_address_pool
[ipid
].last
= time_now
;
3632 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3633 session
[i
].ip_pool_index
= ipid
;
3634 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3639 // Fix the address pool to match a changed session.
3640 // (usually when the master sends us an update).
3641 static void fix_address_pool(int sid
)
3645 ipid
= session
[sid
].ip_pool_index
;
3647 if (ipid
> ip_pool_size
)
3648 return; // Ignore it. rebuild_address_pool will fix it up.
3650 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3651 return; // Just ignore it. rebuild_address_pool will take care of it.
3653 ip_address_pool
[ipid
].assigned
= 1;
3654 ip_address_pool
[ipid
].session
= sid
;
3655 ip_address_pool
[ipid
].last
= time_now
;
3656 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3660 // Add a block of addresses to the IP pool to hand out.
3662 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3666 mask
= 0xffffffff; // Host route only.
3670 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3673 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3675 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3676 continue; // Skip 0 and broadcast addresses.
3678 ip_address_pool
[ip_pool_size
].address
= i
;
3679 ip_address_pool
[ip_pool_size
].assigned
= 0;
3681 if (ip_pool_size
>= MAXIPPOOL
)
3683 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3689 // Initialize the IP address pool
3690 static void initippool()
3695 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3697 if (!(f
= fopen(IPPOOLFILE
, "r")))
3699 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3703 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3706 buf
[4095] = 0; // Force it to be zero terminated/
3708 if (*buf
== '#' || *buf
== '\n')
3709 continue; // Skip comments / blank lines
3710 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3711 if ((p
= (char *)strchr(buf
, ':')))
3715 src
= inet_addr(buf
);
3716 if (src
== INADDR_NONE
)
3718 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3721 // This entry is for a specific IP only
3722 if (src
!= config
->bind_address
)
3727 if ((p
= (char *)strchr(pool
, '/')))
3731 in_addr_t start
= 0, mask
= 0;
3733 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3735 if (!*p
|| !(numbits
= atoi(p
)))
3737 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3740 start
= ntohl(inet_addr(pool
));
3741 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3743 // Add a static route for this pool
3744 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3745 fmtaddr(htonl(start
), 0), 32 + mask
);
3747 routeset(0, start
, mask
, 0, 1);
3749 add_to_ip_pool(start
, mask
);
3753 // It's a single ip address
3754 add_to_ip_pool(inet_addr(pool
), 0);
3758 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3761 void snoop_send_packet(char *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3763 struct sockaddr_in snoop_addr
= {0};
3764 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3767 snoop_addr
.sin_family
= AF_INET
;
3768 snoop_addr
.sin_addr
.s_addr
= destination
;
3769 snoop_addr
.sin_port
= ntohs(port
);
3771 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3772 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3773 htons(snoop_addr
.sin_port
));
3775 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3776 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3778 STAT(packets_snooped
);
3781 static int dump_session(FILE **f
, sessiont
*s
)
3783 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
3788 char filename
[1024];
3790 time_t now
= time(NULL
);
3792 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3793 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3795 if (!(*f
= fopen(filename
, "w")))
3797 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3801 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3802 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3807 "# format: username ip qos uptxoctets downrxoctets\n",
3809 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
3814 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3815 fprintf(*f
, "%s %s %d %u %u\n",
3816 s
->user
, // username
3817 fmtaddr(htonl(s
->ip
), 0), // ip
3818 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3819 (uint32_t) s
->cin_delta
, // uptxoctets
3820 (uint32_t) s
->cout_delta
); // downrxoctets
3822 s
->cin_delta
= s
->cout_delta
= 0;
3827 static void dump_acct_info(int all
)
3833 CSTAT(dump_acct_info
);
3837 for (i
= 0; i
< shut_acct_n
; i
++)
3838 dump_session(&f
, &shut_acct
[i
]);
3844 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3845 dump_session(&f
, &session
[i
]);
3852 int main(int argc
, char *argv
[])
3856 char *optconfig
= CONFIGFILE
;
3858 time(&basetime
); // start clock
3861 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3866 if (fork()) exit(0);
3868 freopen("/dev/null", "r", stdin
);
3869 freopen("/dev/null", "w", stdout
);
3870 freopen("/dev/null", "w", stderr
);
3879 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3882 printf("Args are:\n"
3883 "\t-d\t\tDetach from terminal\n"
3884 "\t-c <file>\tConfig file\n"
3885 "\t-h <hostname>\tForce hostname\n"
3893 // Start the timer routine off
3895 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3896 signal(SIGALRM
, sigalrm_handler
);
3897 siginterrupt(SIGALRM
, 0);
3900 initdata(optdebug
, optconfig
);
3904 init_tbf(config
->num_tbfs
);
3906 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3907 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3908 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3911 rlim
.rlim_cur
= RLIM_INFINITY
;
3912 rlim
.rlim_max
= RLIM_INFINITY
;
3913 // Remove the maximum core size
3914 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3915 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3917 // Make core dumps go to /tmp
3921 if (config
->scheduler_fifo
)
3924 struct sched_param params
= {0};
3925 params
.sched_priority
= 1;
3927 if (get_nprocs() < 2)
3929 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3930 config
->scheduler_fifo
= 0;
3934 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3936 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3940 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3941 config
->scheduler_fifo
= 0;
3946 /* Set up the cluster communications port. */
3947 if (cluster_init() < 0)
3951 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3959 unsigned seed
= time_now
^ getpid();
3960 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
3964 signal(SIGHUP
, sighup_handler
);
3965 signal(SIGCHLD
, sigchild_handler
);
3966 signal(SIGTERM
, shutdown_handler
);
3967 signal(SIGINT
, shutdown_handler
);
3968 signal(SIGQUIT
, shutdown_handler
);
3970 // Prevent us from getting paged out
3971 if (config
->lock_pages
)
3973 if (!mlockall(MCL_CURRENT
))
3974 LOG(1, 0, 0, "Locking pages into memory\n");
3976 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3981 // Drop privileges here
3982 if (config
->target_uid
> 0 && geteuid() == 0)
3983 setuid(config
->target_uid
);
3987 /* remove plugins (so cleanup code gets run) */
3990 // Remove the PID file if we wrote it
3991 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3992 unlink(config
->pid_file
);
3994 /* kill CLI children */
3995 signal(SIGTERM
, SIG_IGN
);
4000 static void sighup_handler(int sig
)
4004 if (log_stream
!= stderr
)
4013 static void sigalrm_handler(int sig
)
4015 // Log current traffic stats
4017 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4018 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4019 (udp_rx
/ 1024.0 / 1024.0 * 8),
4020 (eth_tx
/ 1024.0 / 1024.0 * 8),
4021 (eth_rx
/ 1024.0 / 1024.0 * 8),
4022 (udp_tx
/ 1024.0 / 1024.0 * 8),
4023 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
4024 udp_rx_pkt
, eth_rx_pkt
);
4026 udp_tx
= udp_rx
= 0;
4027 udp_rx_pkt
= eth_rx_pkt
= 0;
4028 eth_tx
= eth_rx
= 0;
4030 if (config
->dump_speed
)
4031 printf("%s\n", config
->bandwidth
);
4033 // Update the internal time counter
4035 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4040 struct param_timer p
= { time_now
};
4041 run_plugins(PLUGIN_TIMER
, &p
);
4046 static void shutdown_handler(int sig
)
4048 LOG(1, 0, 0, "Shutting down\n");
4049 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4052 static void sigchild_handler(int sig
)
4054 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4058 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
)
4061 *challenge_response
= NULL
;
4063 if (!*config
->l2tpsecret
)
4065 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4069 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4071 *challenge_response
= (char *)calloc(17, 1);
4074 MD5Update(&ctx
, &id
, 1);
4075 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4076 MD5Update(&ctx
, challenge
, challenge_length
);
4077 MD5Final(*challenge_response
, &ctx
);
4082 static int facility_value(char *name
)
4085 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4087 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4088 return facilitynames
[i
].c_val
;
4093 static void update_config()
4097 static int timeout
= 0;
4098 static int interval
= 0;
4105 if (log_stream
!= stderr
)
4111 if (*config
->log_filename
)
4113 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4115 char *p
= config
->log_filename
+ 7;
4118 openlog("l2tpns", LOG_PID
, facility_value(p
));
4122 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4124 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4126 fseek(log_stream
, 0, SEEK_END
);
4127 setbuf(log_stream
, NULL
);
4131 log_stream
= stderr
;
4132 setbuf(log_stream
, NULL
);
4138 log_stream
= stderr
;
4139 setbuf(log_stream
, NULL
);
4143 config
->numradiusservers
= 0;
4144 for (i
= 0; i
< MAXRADSERVER
; i
++)
4145 if (config
->radiusserver
[i
])
4147 config
->numradiusservers
++;
4148 // Set radius port: if not set, take the port from the
4149 // first radius server. For the first radius server,
4150 // take the #defined default value from l2tpns.h
4152 // test twice, In case someone works with
4153 // a secondary radius server without defining
4154 // a primary one, this will work even then.
4155 if (i
> 0 && !config
->radiusport
[i
])
4156 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4157 if (!config
->radiusport
[i
])
4158 config
->radiusport
[i
] = RADPORT
;
4161 if (!config
->numradiusservers
)
4162 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4164 // parse radius_authtypes_s
4165 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4166 p
= config
->radius_authtypes_s
;
4169 char *s
= strpbrk(p
, " \t,");
4175 while (*s
== ' ' || *s
== '\t')
4182 if (!strncasecmp("chap", p
, strlen(p
)))
4184 else if (!strncasecmp("pap", p
, strlen(p
)))
4187 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4189 config
->radius_authtypes
|= type
;
4190 if (!config
->radius_authprefer
)
4191 config
->radius_authprefer
= type
;
4196 if (!config
->radius_authtypes
)
4198 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4199 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4202 // normalise radius_authtypes_s
4203 if (config
->radius_authprefer
== AUTHPAP
)
4205 strcpy(config
->radius_authtypes_s
, "pap");
4206 if (config
->radius_authtypes
& AUTHCHAP
)
4207 strcat(config
->radius_authtypes_s
, ", chap");
4211 strcpy(config
->radius_authtypes_s
, "chap");
4212 if (config
->radius_authtypes
& AUTHPAP
)
4213 strcat(config
->radius_authtypes_s
, ", pap");
4216 if (!config
->radius_dae_port
)
4217 config
->radius_dae_port
= DAEPORT
;
4219 // re-initialise the random number source
4220 initrandom(config
->random_device
);
4223 for (i
= 0; i
< MAXPLUGINS
; i
++)
4225 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4228 if (*config
->plugins
[i
])
4231 add_plugin(config
->plugins
[i
]);
4233 else if (*config
->old_plugins
[i
])
4236 remove_plugin(config
->old_plugins
[i
]);
4240 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4241 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4242 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4243 if (!*config
->cluster_interface
)
4244 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4246 if (!config
->cluster_hb_interval
)
4247 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4249 if (!config
->cluster_hb_timeout
)
4250 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4252 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4254 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4255 // late, ensure we're sufficiently larger than that
4256 int t
= 4 * config
->cluster_hb_interval
+ 11;
4258 if (config
->cluster_hb_timeout
< t
)
4260 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4261 config
->cluster_hb_timeout
= t
;
4264 // Push timing changes to the slaves immediately if we're the master
4265 if (config
->cluster_iam_master
)
4266 cluster_heartbeat();
4268 interval
= config
->cluster_hb_interval
;
4269 timeout
= config
->cluster_hb_timeout
;
4273 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4276 if ((f
= fopen(config
->pid_file
, "w")))
4278 fprintf(f
, "%d\n", getpid());
4280 config
->wrote_pid
= 1;
4284 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4288 config
->reload_config
= 0;
4291 static void read_config_file()
4295 if (!config
->config_file
) return;
4296 if (!(f
= fopen(config
->config_file
, "r")))
4298 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4302 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4304 LOG(3, 0, 0, "Done reading config file\n");
4309 int sessionsetup(tunnelidt t
, sessionidt s
)
4311 // A session now exists, set it up
4317 CSTAT(sessionsetup
);
4319 LOG(3, s
, t
, "Doing session setup for session\n");
4323 assign_ip_address(s
);
4326 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4327 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4330 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4331 fmtaddr(htonl(session
[s
].ip
), 0));
4335 // Make sure this is right
4336 session
[s
].tunnel
= t
;
4338 // zap old sessions with same IP and/or username
4339 // Don't kill gardened sessions - doing so leads to a DoS
4340 // from someone who doesn't need to know the password
4343 user
= session
[s
].user
;
4344 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4346 if (i
== s
) continue;
4347 if (!session
[s
].opened
) continue;
4348 if (ip
== session
[i
].ip
)
4350 sessionkill(i
, "Duplicate IP address");
4354 if (config
->allow_duplicate_users
) continue;
4355 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4356 if (!strcasecmp(user
, session
[i
].user
))
4357 sessionkill(i
, "Duplicate session for users");
4364 // Add the route for this session.
4365 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4367 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4368 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4371 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4374 // Static IPs need to be routed if not already
4375 // convered by a Framed-Route. Anything else is part
4376 // of the IP address pool and is already routed, it
4377 // just needs to be added to the IP cache.
4378 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4379 if (session
[s
].ip_pool_index
== -1) // static ip
4381 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4384 cache_ipmap(session
[s
].ip
, s
);
4387 if (!session
[s
].unique_id
)
4389 // did this session just finish radius?
4390 LOG(3, s
, t
, "Sending initial IPCP to client\n");
4392 session
[s
].unique_id
= ++last_id
;
4395 // Run the plugin's against this new session.
4397 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4398 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4401 // Allocate TBFs if throttled
4402 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4403 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4405 session
[s
].last_packet
= time_now
;
4407 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4408 fmtaddr(htonl(session
[s
].ip
), 0),
4409 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4411 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4413 return 1; // RADIUS OK and IP allocated, done...
4417 // This session just got dropped on us by the master or something.
4418 // Make sure our tables up up to date...
4420 int load_session(sessionidt s
, sessiont
*new)
4426 if (new->ip_pool_index
>= MAXIPPOOL
||
4427 new->tunnel
>= MAXTUNNEL
)
4429 LOG(0, s
, 0, "Strange session update received!\n");
4430 // FIXME! What to do here?
4435 // Ok. All sanity checks passed. Now we're committed to
4436 // loading the new session.
4439 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4441 // See if routes/ip cache need updating
4442 if (new->ip
!= session
[s
].ip
)
4445 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4446 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4447 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4455 // remove old routes...
4456 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4458 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4459 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4462 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4468 if (session
[s
].ip_pool_index
== -1) // static IP
4470 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4472 else // It's part of the IP pool, remove it manually.
4473 uncache_ipmap(session
[s
].ip
);
4478 // add new routes...
4479 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4481 if ((new->ip
& new->route
[i
].mask
) ==
4482 (new->route
[i
].ip
& new->route
[i
].mask
))
4485 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4491 // If there's a new one, add it.
4492 if (new->ip_pool_index
== -1)
4494 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4497 cache_ipmap(new->ip
, s
);
4502 if (new->flags
& SF_IPV6_ROUTED
&& !(session
[s
].flags
& SF_IPV6_ROUTED
))
4503 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4506 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4508 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4512 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4514 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4515 new->filter_out
= 0;
4518 if (new->filter_in
!= session
[s
].filter_in
)
4520 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4521 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4524 if (new->filter_out
!= session
[s
].filter_out
)
4526 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4527 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4530 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4531 // for walking the sessions to forward byte counts to the master.
4532 config
->cluster_highest_sessionid
= s
;
4534 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4536 // Do fixups into address pool.
4537 if (new->ip_pool_index
!= -1)
4538 fix_address_pool(s
);
4543 static void initplugins()
4547 loaded_plugins
= ll_init();
4548 // Initialize the plugins to nothing
4549 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4550 plugins
[i
] = ll_init();
4553 static void *open_plugin(char *plugin_name
, int load
)
4555 char path
[256] = "";
4557 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4558 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4559 return dlopen(path
, RTLD_NOW
);
4562 // plugin callback to get a config value
4563 static void *getconfig(char *key
, enum config_typet type
)
4567 for (i
= 0; config_values
[i
].key
; i
++)
4569 if (!strcmp(config_values
[i
].key
, key
))
4571 if (config_values
[i
].type
== type
)
4572 return ((void *) config
) + config_values
[i
].offset
;
4574 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4575 key
, type
, config_values
[i
].type
);
4581 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4585 static int add_plugin(char *plugin_name
)
4587 static struct pluginfuncs funcs
= {
4592 sessiontbysessionidt
,
4593 sessionidtbysessiont
,
4600 cluster_send_session
,
4603 void *p
= open_plugin(plugin_name
, 1);
4604 int (*initfunc
)(struct pluginfuncs
*);
4609 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4613 if (ll_contains(loaded_plugins
, p
))
4616 return 0; // already loaded
4620 int *v
= dlsym(p
, "plugin_api_version");
4621 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4623 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4629 if ((initfunc
= dlsym(p
, "plugin_init")))
4631 if (!initfunc(&funcs
))
4633 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4639 ll_push(loaded_plugins
, p
);
4641 for (i
= 0; i
< max_plugin_functions
; i
++)
4644 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4646 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4647 ll_push(plugins
[i
], x
);
4651 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4655 static void run_plugin_done(void *plugin
)
4657 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4663 static int remove_plugin(char *plugin_name
)
4665 void *p
= open_plugin(plugin_name
, 0);
4671 if (ll_contains(loaded_plugins
, p
))
4674 for (i
= 0; i
< max_plugin_functions
; i
++)
4677 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4678 ll_delete(plugins
[i
], x
);
4681 ll_delete(loaded_plugins
, p
);
4687 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4691 int run_plugins(int plugin_type
, void *data
)
4693 int (*func
)(void *data
);
4695 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4696 return PLUGIN_RET_ERROR
;
4698 ll_reset(plugins
[plugin_type
]);
4699 while ((func
= ll_next(plugins
[plugin_type
])))
4703 if (r
!= PLUGIN_RET_OK
)
4704 return r
; // stop here
4707 return PLUGIN_RET_OK
;
4710 static void plugins_done()
4714 ll_reset(loaded_plugins
);
4715 while ((p
= ll_next(loaded_plugins
)))
4719 static void processcontrol(uint8_t * buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4721 struct nsctl request
;
4722 struct nsctl response
;
4723 int type
= unpack_control(&request
, buf
, len
);
4727 if (log_stream
&& config
->debug
>= 4)
4731 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4732 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4736 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4737 dump_control(&request
, log_stream
);
4743 case NSCTL_REQ_LOAD
:
4744 if (request
.argc
!= 1)
4746 response
.type
= NSCTL_RES_ERR
;
4748 response
.argv
[0] = "name of plugin required";
4750 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4752 response
.type
= NSCTL_RES_ERR
;
4754 response
.argv
[0] = !r
4755 ? "plugin already loaded"
4756 : "error loading plugin";
4760 response
.type
= NSCTL_RES_OK
;
4766 case NSCTL_REQ_UNLOAD
:
4767 if (request
.argc
!= 1)
4769 response
.type
= NSCTL_RES_ERR
;
4771 response
.argv
[0] = "name of plugin required";
4773 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4775 response
.type
= NSCTL_RES_ERR
;
4777 response
.argv
[0] = !r
4778 ? "plugin not loaded"
4779 : "plugin not found";
4783 response
.type
= NSCTL_RES_OK
;
4789 case NSCTL_REQ_HELP
:
4790 response
.type
= NSCTL_RES_OK
;
4793 ll_reset(loaded_plugins
);
4794 while ((p
= ll_next(loaded_plugins
)))
4796 char **help
= dlsym(p
, "plugin_control_help");
4797 while (response
.argc
< 0xff && help
&& *help
)
4798 response
.argv
[response
.argc
++] = *help
++;
4803 case NSCTL_REQ_CONTROL
:
4805 struct param_control param
= {
4806 config
->cluster_iam_master
,
4813 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4815 if (r
== PLUGIN_RET_ERROR
)
4817 response
.type
= NSCTL_RES_ERR
;
4819 response
.argv
[0] = param
.additional
4821 : "error returned by plugin";
4823 else if (r
== PLUGIN_RET_NOTMASTER
)
4825 static char msg
[] = "must be run on master: 000.000.000.000";
4827 response
.type
= NSCTL_RES_ERR
;
4829 if (config
->cluster_master_address
)
4831 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4832 response
.argv
[0] = msg
;
4836 response
.argv
[0] = "must be run on master: none elected";
4839 else if (!(param
.response
& NSCTL_RESPONSE
))
4841 response
.type
= NSCTL_RES_ERR
;
4843 response
.argv
[0] = param
.response
4844 ? "unrecognised response value from plugin"
4845 : "unhandled action";
4849 response
.type
= param
.response
;
4851 if (param
.additional
)
4854 response
.argv
[0] = param
.additional
;
4862 response
.type
= NSCTL_RES_ERR
;
4864 response
.argv
[0] = "error unpacking control packet";
4867 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4870 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4874 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4877 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4878 if (log_stream
&& config
->debug
>= 4)
4880 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4881 dump_control(&response
, log_stream
);
4885 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4886 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4891 static tunnelidt
new_tunnel()
4894 for (i
= 1; i
< MAXTUNNEL
; i
++)
4896 if (tunnel
[i
].state
== TUNNELFREE
)
4898 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4899 if (i
> config
->cluster_highest_tunnelid
)
4900 config
->cluster_highest_tunnelid
= i
;
4904 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4909 // We're becoming the master. Do any required setup..
4911 // This is principally telling all the plugins that we're
4912 // now a master, and telling them about all the sessions
4913 // that are active too..
4915 void become_master(void)
4918 static struct event_data d
[RADIUS_FDS
];
4919 struct epoll_event e
;
4921 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4923 // running a bunch of iptables commands is slow and can cause
4924 // the master to drop tunnels on takeover--kludge around the
4925 // problem by forking for the moment (note: race)
4926 if (!fork_and_close())
4928 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4930 if (!session
[s
].opened
) // Not an in-use session.
4933 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4940 for (i
= 0; i
< RADIUS_FDS
; i
++)
4942 d
[i
].type
= FD_TYPE_RADIUS
;
4946 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
4950 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4956 if (CLI_HELP_REQUESTED
)
4957 return CLI_HELP_NO_ARGS
;
4960 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4962 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4965 if (!session
[s
].opened
)
4968 idle
= time_now
- session
[s
].last_packet
;
4969 idle
/= 5 ; // In multiples of 5 seconds.
4979 for (i
= 0; i
< 63; ++i
)
4981 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4983 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4984 cli_print(cli
, "%d total sessions open.", count
);
4988 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4994 if (CLI_HELP_REQUESTED
)
4995 return CLI_HELP_NO_ARGS
;
4998 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5000 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5003 if (!session
[s
].opened
)
5006 d
= time_now
- session
[s
].opened
;
5009 while (d
> 1 && open
< 32)
5019 for (i
= 0; i
< 30; ++i
)
5021 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5024 cli_print(cli
, "%d total sessions open.", count
);
5030 * This unencodes the AVP using the L2TP secret and the previously
5031 * stored random vector. It overwrites the hidden data with the
5032 * unhidden AVP subformat.
5034 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5040 uint16_t m
= htons(type
);
5042 // Compute initial pad
5044 MD5Update(&ctx
, (unsigned char *) &m
, 2);
5045 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5046 MD5Update(&ctx
, vector
, vec_len
);
5047 MD5Final(digest
, &ctx
);
5049 // pointer to last decoded 16 octets
5054 // calculate a new pad based on the last decoded block
5055 if (d
>= sizeof(digest
))
5058 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5059 MD5Update(&ctx
, last
, sizeof(digest
));
5060 MD5Final(digest
, &ctx
);
5066 *value
++ ^= digest
[d
++];
5071 int find_filter(char const *name
, size_t len
)
5076 for (i
= 0; i
< MAXFILTER
; i
++)
5078 if (!*ip_filters
[i
].name
)
5086 if (strlen(ip_filters
[i
].name
) != len
)
5089 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5096 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5100 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5101 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5102 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5103 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5104 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5110 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5114 case FILTER_FLAG_OP_ANY
:
5115 return (flags
& sflags
) || (~flags
& cflags
);
5117 case FILTER_FLAG_OP_ALL
:
5118 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5120 case FILTER_FLAG_OP_EST
:
5121 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5127 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5129 uint16_t frag_offset
;
5133 uint16_t src_port
= 0;
5134 uint16_t dst_port
= 0;
5136 ip_filter_rulet
*rule
;
5138 if (len
< 20) // up to end of destination address
5141 if ((*buf
>> 4) != 4) // IPv4
5144 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5146 src_ip
= *(in_addr_t
*) (buf
+ 12);
5147 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5149 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5151 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5152 if (len
< l
+ 4) // ports
5155 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5156 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5157 if (proto
== IPPROTO_TCP
)
5159 if (len
< l
+ 14) // flags
5162 flags
= buf
[l
+ 13] & 0x3f;
5166 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5168 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5171 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5172 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5175 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5176 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5181 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5189 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5191 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5194 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5197 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5198 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5205 return rule
->action
== FILTER_ACTION_PERMIT
;