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 1.112 2005-06-24 07:05:04 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 snoopfd
= -1; // UDP file handle for sending out intercept data
64 int *radfds
= NULL
; // RADIUS requests file handles
65 int ifrfd
= -1; // File descriptor for routing, etc
66 int ifr6fd
= -1; // File descriptor for IPv6 routing, etc
67 int rand_fd
= -1; // Random data source
68 int cluster_sockfd
= -1; // Intra-cluster communications socket.
69 int epollfd
= -1; // event polling
70 time_t basetime
= 0; // base clock
71 char hostname
[1000] = ""; // us.
72 static int tunidx
; // ifr_ifindex of tun device
73 static int syslog_log
= 0; // are we logging to syslog
74 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
75 uint32_t last_id
= 0; // Unique ID for radius accounting
77 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
78 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
80 static void *ip_hash
[256]; // Mapping from IP address to session structures.
83 struct ipv6radix
*branch
;
84 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
87 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
88 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
91 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
92 time_t time_now
= 0; // Current time in seconds since epoch.
93 static char time_now_string
[64] = {0}; // Current time as a string.
94 char main_quit
= 0; // True if we're in the process of exiting.
95 linked_list
*loaded_plugins
;
96 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
98 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
99 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
101 config_descriptt config_values
[] = {
102 CONFIG("debug", debug
, INT
),
103 CONFIG("log_file", log_filename
, STRING
),
104 CONFIG("pid_file", pid_file
, STRING
),
105 CONFIG("random_device", random_device
, STRING
),
106 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
107 CONFIG("primary_dns", default_dns1
, IPv4
),
108 CONFIG("secondary_dns", default_dns2
, IPv4
),
109 CONFIG("primary_radius", radiusserver
[0], IPv4
),
110 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
111 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
112 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
113 CONFIG("radius_accounting", radius_accounting
, BOOL
),
114 CONFIG("radius_interim", radius_interim
, INT
),
115 CONFIG("radius_secret", radiussecret
, STRING
),
116 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
117 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
118 CONFIG("bind_address", bind_address
, IPv4
),
119 CONFIG("peer_address", peer_address
, IPv4
),
120 CONFIG("send_garp", send_garp
, BOOL
),
121 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
122 CONFIG("throttle_buckets", num_tbfs
, INT
),
123 CONFIG("accounting_dir", accounting_dir
, STRING
),
124 CONFIG("setuid", target_uid
, INT
),
125 CONFIG("dump_speed", dump_speed
, BOOL
),
126 CONFIG("multi_read_count", multi_read_count
, INT
),
127 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
128 CONFIG("lock_pages", lock_pages
, BOOL
),
129 CONFIG("icmp_rate", icmp_rate
, INT
),
130 CONFIG("packet_limit", max_packets
, INT
),
131 CONFIG("cluster_address", cluster_address
, IPv4
),
132 CONFIG("cluster_interface", cluster_interface
, STRING
),
133 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
134 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
135 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
136 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
140 static char *plugin_functions
[] = {
147 "plugin_new_session",
148 "plugin_kill_session",
150 "plugin_radius_response",
151 "plugin_become_master",
152 "plugin_new_session_master",
155 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
157 // Counters for shutdown sessions
158 static sessiont shut_acct
[8192];
159 static sessionidt shut_acct_n
= 0;
161 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
162 sessiont
*session
= NULL
; // Array of session structures.
163 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
164 radiust
*radius
= NULL
; // Array of radius structures.
165 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
166 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
167 static controlt
*controlfree
= 0;
168 struct Tstats
*_statistics
= NULL
;
170 struct Tringbuffer
*ringbuffer
= NULL
;
173 static void cache_ipmap(in_addr_t ip
, int s
);
174 static void uncache_ipmap(in_addr_t ip
);
175 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
176 static void free_ip_address(sessionidt s
);
177 static void dump_acct_info(int all
);
178 static void sighup_handler(int sig
);
179 static void sigalrm_handler(int sig
);
180 static void shutdown_handler(int sig
);
181 static void sigchild_handler(int sig
);
182 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
);
183 static void update_config(void);
184 static void read_config_file(void);
185 static void initplugins(void);
186 static int add_plugin(char *plugin_name
);
187 static int remove_plugin(char *plugin_name
);
188 static void plugins_done(void);
189 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
190 static tunnelidt
new_tunnel(void);
191 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
193 // on slaves, alow BGP to withdraw cleanly before exiting
196 // quit actions (master)
197 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
198 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
200 // return internal time (10ths since process startup), set f if given
201 static clockt
now(double *f
)
205 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
206 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
209 // work out a retry time based on try number
210 // This is a straight bounded exponential backoff.
211 // Maximum re-try time is 32 seconds. (2^5).
212 clockt
backoff(uint8_t try)
214 if (try > 5) try = 5; // max backoff
215 return now(NULL
) + 10 * (1 << try);
220 // Log a debug message. Typically called via the LOG macro
222 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
224 static char message
[65536] = {0};
230 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
231 ringbuffer
->tail
= 0;
232 if (ringbuffer
->tail
== ringbuffer
->head
)
233 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
234 ringbuffer
->head
= 0;
236 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
237 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
238 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
239 va_start(ap
, format
);
240 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
245 if (config
->debug
< level
) return;
247 va_start(ap
, format
);
248 vsnprintf(message
, sizeof(message
), format
, ap
);
251 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
253 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
258 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
261 const uint8_t *d
= (const uint8_t *) data
;
263 if (config
->debug
< level
) return;
265 // No support for _log_hex to syslog
268 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
269 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
271 for (i
= 0; i
< maxsize
; )
273 fprintf(log_stream
, "%4X: ", i
);
274 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
276 fprintf(log_stream
, "%02X ", d
[j
]);
278 fputs(": ", log_stream
);
281 for (; j
< i
+ 16; j
++)
283 fputs(" ", log_stream
);
285 fputs(": ", log_stream
);
288 fputs(" ", log_stream
);
289 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
291 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
292 fputc(d
[j
], log_stream
);
294 fputc('.', log_stream
);
297 fputs(" ", log_stream
);
301 fputs("\n", log_stream
);
305 setbuf(log_stream
, NULL
);
309 // update a counter, accumulating 2^32 wraps
310 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
312 uint32_t new = *counter
+ delta
;
319 // initialise the random generator
320 static void initrandom(char *source
)
322 static char path
[sizeof(config
->random_device
)] = "*undefined*";
324 // reinitialise only if we are forced to do so or if the config has changed
325 if (source
&& !strncmp(path
, source
, sizeof(path
)))
328 // close previous source, if any
337 snprintf(path
, sizeof(path
), "%s", source
);
341 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
343 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
344 path
, strerror(errno
));
349 // fill buffer with random data
350 void random_data(uint8_t *buf
, int len
)
357 n
= read(rand_fd
, buf
, len
);
358 if (n
>= len
) return;
363 LOG(0, 0, 0, "Error reading from random source: %s\n",
366 // fall back to rand()
374 // append missing data
376 // not using the low order bits from the prng stream
377 buf
[n
++] = (rand() >> 4) & 0xff;
382 // This adds it to the routing table, advertises it
383 // via BGP if enabled, and stuffs it into the
384 // 'sessionbyip' cache.
386 // 'ip' and 'mask' must be in _host_ order.
388 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
393 if (!mask
) mask
= 0xffffffff;
395 ip
&= mask
; // Force the ip to be the first one in the route.
397 memset(&r
, 0, sizeof(r
));
398 r
.rt_dev
= config
->tundevice
;
399 r
.rt_dst
.sa_family
= AF_INET
;
400 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
401 r
.rt_gateway
.sa_family
= AF_INET
;
402 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
403 r
.rt_genmask
.sa_family
= AF_INET
;
404 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
405 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
407 r
.rt_flags
|= RTF_GATEWAY
;
408 else if (mask
== 0xffffffff)
409 r
.rt_flags
|= RTF_HOST
;
411 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
412 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
413 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
415 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
416 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
420 bgp_add_route(htonl(ip
), htonl(mask
));
422 bgp_del_route(htonl(ip
), htonl(mask
));
425 // Add/Remove the IPs to the 'sessionbyip' cache.
426 // Note that we add the zero address in the case of
427 // a network route. Roll on CIDR.
429 // Note that 's == 0' implies this is the address pool.
430 // We still cache it here, because it will pre-fill
431 // the malloc'ed tree.
435 if (!add
) // Are we deleting a route?
436 s
= 0; // Caching the session as '0' is the same as uncaching.
438 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
443 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
446 char ipv6addr
[INET6_ADDRSTRLEN
];
450 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
454 memset(&rt
, 0, sizeof(rt
));
456 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
457 rt
.rtmsg_dst_len
= prefixlen
;
459 rt
.rtmsg_flags
= RTF_UP
;
460 rt
.rtmsg_ifindex
= tunidx
;
462 LOG(1, 0, 0, "Route %s %s/%d\n",
464 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
467 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
468 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
471 // FIXME: need to add BGP routing (RFC2858)
475 if (!add
) // Are we deleting a route?
476 s
= 0; // Caching the session as '0' is the same as uncaching.
478 cache_ipv6map(ip
, prefixlen
, s
);
484 // defined in linux/ipv6.h, but tricky to include from user-space
485 // TODO: move routing to use netlink rather than ioctl
487 struct in6_addr ifr6_addr
;
488 __u32 ifr6_prefixlen
;
489 unsigned int ifr6_ifindex
;
493 // Set up TUN interface
494 static void inittun(void)
497 struct in6_ifreq ifr6
;
498 struct sockaddr_in sin
= {0};
499 memset(&ifr
, 0, sizeof(ifr
));
500 ifr
.ifr_flags
= IFF_TUN
;
502 tunfd
= open(TUNDEVICE
, O_RDWR
);
505 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
509 int flags
= fcntl(tunfd
, F_GETFL
, 0);
510 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
512 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
514 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
517 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
518 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
519 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
521 sin
.sin_family
= AF_INET
;
522 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
523 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
525 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
527 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
530 /* Bump up the qlen to deal with bursts from the network */
532 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
534 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
537 ifr
.ifr_flags
= IFF_UP
;
538 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
540 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
543 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
545 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
548 tunidx
= ifr
.ifr_ifindex
;
550 // Only setup IPv6 on the tun device if we have a configured prefix
551 if (config
->ipv6_prefix
.s6_addr
[0] > 0) {
552 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
554 // Link local address is FE80::1
555 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
556 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
557 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
558 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
559 ifr6
.ifr6_prefixlen
= 64;
560 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
561 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
563 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
564 " %s\n", strerror(errno
));
567 // Global address is prefix::1
568 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
569 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
570 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
571 ifr6
.ifr6_prefixlen
= 64;
572 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
573 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
575 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
582 static void initudp(void)
585 struct sockaddr_in addr
;
588 memset(&addr
, 0, sizeof(addr
));
589 addr
.sin_family
= AF_INET
;
590 addr
.sin_port
= htons(L2TPPORT
);
591 addr
.sin_addr
.s_addr
= config
->bind_address
;
592 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
593 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
595 int flags
= fcntl(udpfd
, F_GETFL
, 0);
596 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
598 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
600 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
603 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
606 memset(&addr
, 0, sizeof(addr
));
607 addr
.sin_family
= AF_INET
;
608 addr
.sin_port
= htons(NSCTL_PORT
);
609 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
610 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
611 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
613 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
619 // Find session by IP, < 1 for not found
621 // Confusingly enough, this 'ip' must be
622 // in _network_ order. This being the common
623 // case when looking it up from IP packet headers.
625 // We actually use this cache for two things.
626 // #1. For used IP addresses, this maps to the
627 // session ID that it's used by.
628 // #2. For un-used IP addresses, this maps to the
629 // index into the pool table that contains that
633 static int lookup_ipmap(in_addr_t ip
)
635 uint8_t *a
= (uint8_t *) &ip
;
636 uint8_t **d
= (uint8_t **) ip_hash
;
638 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
639 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
640 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
642 return (int) (intptr_t) d
[(size_t) *a
];
645 static int lookup_ipv6map(struct in6_addr ip
)
647 struct ipv6radix
*curnode
;
650 char ipv6addr
[INET6_ADDRSTRLEN
];
652 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
656 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
658 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
663 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
664 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
671 sessionidt
sessionbyip(in_addr_t ip
)
673 int s
= lookup_ipmap(ip
);
676 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
677 return (sessionidt
) s
;
682 sessionidt
sessionbyipv6(struct in6_addr ip
)
685 CSTAT(sessionbyipv6
);
687 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
688 (ip
.s6_addr
[0] == 0xFE && ip
.s6_addr
[1] == 0x80 &&
689 (ip
.s6_addr16
[1] == ip
.s6_addr16
[2] == ip
.s6_addr16
[3] == 0))) {
690 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
692 s
= lookup_ipv6map(ip
);
695 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
702 // Take an IP address in HOST byte order and
703 // add it to the sessionid by IP cache.
705 // (It's actually cached in network order)
707 static void cache_ipmap(in_addr_t ip
, int s
)
709 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
710 uint8_t *a
= (uint8_t *) &nip
;
711 uint8_t **d
= (uint8_t **) ip_hash
;
714 for (i
= 0; i
< 3; i
++)
716 if (!d
[(size_t) a
[i
]])
718 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
722 d
= (uint8_t **) d
[(size_t) a
[i
]];
725 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
728 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
731 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
732 // else a map to an ip pool index.
735 static void uncache_ipmap(in_addr_t ip
)
737 cache_ipmap(ip
, 0); // Assign it to the NULL session.
740 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
744 struct ipv6radix
*curnode
;
745 char ipv6addr
[INET6_ADDRSTRLEN
];
747 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
749 bytes
= prefixlen
>> 3;
752 if (curnode
->branch
== NULL
)
754 if (!(curnode
->branch
= calloc(256,
755 sizeof (struct ipv6radix
))))
758 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
765 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
766 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
770 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
771 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
777 // CLI list to dump current ipcache.
779 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
781 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
785 if (CLI_HELP_REQUESTED
)
786 return CLI_HELP_NO_ARGS
;
788 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
790 for (i
= 0; i
< 256; ++i
)
795 for (j
= 0; j
< 256; ++j
)
800 for (k
= 0; k
< 256; ++k
)
805 for (l
= 0; l
< 256; ++l
)
809 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
815 cli_print(cli
, "%d entries in cache", count
);
820 // Find session by username, 0 for not found
821 // walled garden users aren't authenticated, so the username is
822 // reasonably useless. Ignore them to avoid incorrect actions
824 // This is VERY inefficent. Don't call it often. :)
826 sessionidt
sessionbyuser(char *username
)
829 CSTAT(sessionbyuser
);
831 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
833 if (!session
[s
].opened
)
836 if (session
[s
].walled_garden
)
837 continue; // Skip walled garden users.
839 if (!strncmp(session
[s
].user
, username
, 128))
843 return 0; // Not found.
846 void send_garp(in_addr_t ip
)
852 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
855 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
858 memset(&ifr
, 0, sizeof(ifr
));
859 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
860 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
862 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
866 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
867 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
869 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
874 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
877 static sessiont
*sessiontbysessionidt(sessionidt s
)
879 if (!s
|| s
>= MAXSESSION
) return NULL
;
883 static sessionidt
sessionidtbysessiont(sessiont
*s
)
885 sessionidt val
= s
-session
;
886 if (s
< session
|| val
>= MAXSESSION
) return 0;
890 // actually send a control message for a specific tunnel
891 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
893 struct sockaddr_in addr
;
899 static int backtrace_count
= 0;
900 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
901 STAT(tunnel_tx_errors
);
902 log_backtrace(backtrace_count
, 5)
908 static int backtrace_count
= 0;
909 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
910 log_backtrace(backtrace_count
, 5)
911 STAT(tunnel_tx_errors
);
915 memset(&addr
, 0, sizeof(addr
));
916 addr
.sin_family
= AF_INET
;
917 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
918 addr
.sin_port
= htons(tunnel
[t
].port
);
920 // sequence expected, if sequence in message
921 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
923 // If this is a control message, deal with retries
926 tunnel
[t
].last
= time_now
; // control message sent
927 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
928 if (tunnel
[t
].try > 1)
930 STAT(tunnel_retries
);
931 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
935 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
937 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
938 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
939 STAT(tunnel_tx_errors
);
943 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
944 STAT(tunnel_tx_packets
);
945 INC_STAT(tunnel_tx_bytes
, l
);
949 // Tiny helper function to write data to
952 int tun_write(uint8_t * data
, int size
)
954 return write(tunfd
, data
, size
);
957 // process outgoing (to tunnel) IP
959 static void processipout(uint8_t * buf
, int len
)
966 char *data
= buf
; // Keep a copy of the originals.
969 uint8_t b
[MAXETHER
+ 20];
973 if (len
< MIN_IP_SIZE
)
975 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
981 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
986 // Skip the tun header
990 // Got an IP header now
991 if (*(uint8_t *)(buf
) >> 4 != 4)
993 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
997 ip
= *(uint32_t *)(buf
+ 16);
998 if (!(s
= sessionbyip(ip
)))
1000 // Is this a packet for a session that doesn't exist?
1001 static int rate
= 0; // Number of ICMP packets we've sent this second.
1002 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1004 if (last
!= time_now
)
1010 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1012 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1013 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1014 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1018 t
= session
[s
].tunnel
;
1021 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1022 if (config
->max_packets
> 0)
1024 if (sess_local
[s
].last_packet_out
== TIME
)
1026 int max
= config
->max_packets
;
1028 // All packets for throttled sessions are handled by the
1029 // master, so further limit by using the throttle rate.
1030 // A bit of a kludge, since throttle rate is in kbps,
1031 // but should still be generous given our average DSL
1032 // packet size is 200 bytes: a limit of 28kbps equates
1033 // to around 180 packets per second.
1034 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1035 max
= sp
->throttle_out
;
1037 if (++sess_local
[s
].packets_out
> max
)
1039 sess_local
[s
].packets_dropped
++;
1045 if (sess_local
[s
].packets_dropped
)
1047 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1048 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1049 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1050 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1054 sess_local
[s
].last_packet_out
= TIME
;
1055 sess_local
[s
].packets_out
= 1;
1056 sess_local
[s
].packets_dropped
= 0;
1060 // run access-list if any
1061 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1066 // Are we throttling this session?
1067 if (config
->cluster_iam_master
)
1068 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1070 master_throttle_packet(sp
->tbf_out
, data
, size
);
1073 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1075 // We are walled-gardening this
1076 master_garden_packet(s
, data
, size
);
1080 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1082 // Add on L2TP header
1084 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1086 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1089 // Snooping this session, send it to intercept box
1090 if (sp
->snoop_ip
&& sp
->snoop_port
)
1091 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1093 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1094 sp
->cout_delta
+= len
;
1098 sess_local
[s
].cout
+= len
; // To send to master..
1099 sess_local
[s
].pout
++;
1102 // process outgoing (to tunnel) IPv6
1104 static void processipv6out(uint8_t * buf
, int len
)
1110 struct in6_addr ip6
;
1112 char *data
= buf
; // Keep a copy of the originals.
1115 uint8_t b
[MAXETHER
+ 20];
1117 CSTAT(processipv6out
);
1119 if (len
< MIN_IP_SIZE
)
1121 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1122 STAT(tunnel_tx_errors
);
1125 if (len
>= MAXETHER
)
1127 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1128 STAT(tunnel_tx_errors
);
1132 // Skip the tun header
1136 // Got an IP header now
1137 if (*(uint8_t *)(buf
) >> 4 != 6)
1139 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1143 ip6
= *(struct in6_addr
*)(buf
+24);
1144 s
= sessionbyipv6(ip6
);
1148 ip
= *(uint32_t *)(buf
+ 32);
1149 s
= sessionbyip(ip
);
1154 // Is this a packet for a session that doesn't exist?
1155 static int rate
= 0; // Number of ICMP packets we've sent this second.
1156 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1158 if (last
!= time_now
)
1164 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1166 // FIXME: Should send icmp6 host unreachable
1170 t
= session
[s
].tunnel
;
1173 // FIXME: add DoS prevention/filters?
1177 // Are we throttling this session?
1178 if (config
->cluster_iam_master
)
1179 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1181 master_throttle_packet(sp
->tbf_out
, data
, size
);
1184 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1186 // We are walled-gardening this
1187 master_garden_packet(s
, data
, size
);
1191 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1193 // Add on L2TP header
1195 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIPV6
);
1197 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1200 // Snooping this session, send it to intercept box
1201 if (sp
->snoop_ip
&& sp
->snoop_port
)
1202 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1204 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1205 sp
->cout_delta
+= len
;
1209 sess_local
[s
].cout
+= len
; // To send to master..
1210 sess_local
[s
].pout
++;
1214 // Helper routine for the TBF filters.
1215 // Used to send queued data in to the user!
1217 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1223 uint8_t b
[MAXETHER
+ 20];
1225 if (len
< 0 || len
> MAXETHER
)
1227 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1231 // Skip the tun header
1235 ip
= *(in_addr_t
*)(buf
+ 16);
1240 t
= session
[s
].tunnel
;
1243 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1245 // Add on L2TP header
1247 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1249 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1252 // Snooping this session.
1253 if (sp
->snoop_ip
&& sp
->snoop_port
)
1254 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1256 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1257 sp
->cout_delta
+= len
;
1261 sess_local
[s
].cout
+= len
; // To send to master..
1262 sess_local
[s
].pout
++;
1265 // add an AVP (16 bit)
1266 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1268 uint16_t l
= (m
? 0x8008 : 0x0008);
1269 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1270 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1271 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1272 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1276 // add an AVP (32 bit)
1277 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1279 uint16_t l
= (m
? 0x800A : 0x000A);
1280 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1281 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1282 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1283 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1287 // add an AVP (string)
1288 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1290 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1291 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1292 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1293 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1294 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1295 c
->length
+= 6 + strlen(val
);
1299 static void controlb(controlt
* c
, uint16_t avp
, char *val
, unsigned int len
, uint8_t m
)
1301 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1302 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1303 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1304 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1305 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1306 c
->length
+= 6 + len
;
1309 // new control connection
1310 static controlt
*controlnew(uint16_t mtype
)
1314 c
= malloc(sizeof(controlt
));
1318 controlfree
= c
->next
;
1322 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1324 control16(c
, 0, mtype
, 1);
1328 // send zero block if nothing is waiting
1330 static void controlnull(tunnelidt t
)
1333 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1336 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1337 *(uint16_t *) (buf
+ 2) = htons(12); // length
1338 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1339 *(uint16_t *) (buf
+ 6) = htons(0); // session
1340 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1341 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1342 tunnelsend(buf
, 12, t
);
1345 // add a control message to a tunnel, and send if within window
1346 static void controladd(controlt
* c
, tunnelidt t
, sessionidt far
)
1348 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1349 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1350 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1351 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1352 tunnel
[t
].ns
++; // advance sequence
1353 // link in message in to queue
1354 if (tunnel
[t
].controlc
)
1355 tunnel
[t
].controle
->next
= c
;
1357 tunnel
[t
].controls
= c
;
1359 tunnel
[t
].controle
= c
;
1360 tunnel
[t
].controlc
++;
1362 // send now if space in window
1363 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1365 tunnel
[t
].try = 0; // first send
1366 tunnelsend(c
->buf
, c
->length
, t
);
1371 // Throttle or Unthrottle a session
1373 // Throttle the data from/to through a session to no more than
1374 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1377 // If either value is -1, the current value is retained for that
1380 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1382 if (!session
[s
].opened
)
1383 return; // No-one home.
1385 if (!*session
[s
].user
)
1386 return; // User not logged in
1390 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1391 if (session
[s
].tbf_in
)
1392 free_tbf(session
[s
].tbf_in
);
1395 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1397 session
[s
].tbf_in
= 0;
1399 session
[s
].throttle_in
= rate_in
;
1404 int bytes
= rate_out
* 1024 / 8;
1405 if (session
[s
].tbf_out
)
1406 free_tbf(session
[s
].tbf_out
);
1409 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1411 session
[s
].tbf_out
= 0;
1413 session
[s
].throttle_out
= rate_out
;
1417 // add/remove filters from session (-1 = no change)
1418 static void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1420 if (!session
[s
].opened
)
1421 return; // No-one home.
1423 if (!*session
[s
].user
)
1424 return; // User not logged in
1427 if (filter_in
> MAXFILTER
) filter_in
= -1;
1428 if (filter_out
> MAXFILTER
) filter_out
= -1;
1429 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1430 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1434 if (session
[s
].filter_in
)
1435 ip_filters
[session
[s
].filter_in
- 1].used
--;
1438 ip_filters
[filter_in
- 1].used
++;
1440 session
[s
].filter_in
= filter_in
;
1443 if (filter_out
>= 0)
1445 if (session
[s
].filter_out
)
1446 ip_filters
[session
[s
].filter_out
- 1].used
--;
1449 ip_filters
[filter_out
- 1].used
++;
1451 session
[s
].filter_out
= filter_out
;
1455 // start tidy shutdown of session
1456 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1458 int walled_garden
= session
[s
].walled_garden
;
1461 CSTAT(sessionshutdown
);
1463 if (!session
[s
].opened
)
1465 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1466 return; // not a live session
1469 if (!session
[s
].die
)
1471 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1472 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1473 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1476 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1478 // RADIUS Stop message
1479 uint16_t r
= sess_local
[s
].radius
;
1485 // stop, if not already trying
1486 if (radius
[r
].state
!= RADIUSSTOP
)
1487 radiussend(r
, RADIUSSTOP
);
1490 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1492 // Save counters to dump to accounting file
1493 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1494 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1498 { // IP allocated, clear and unroute
1501 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1503 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1504 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1507 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1508 session
[s
].route
[r
].ip
= 0;
1511 if (session
[s
].ip_pool_index
== -1) // static ip
1513 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1519 // unroute IPv6, if setup
1520 if (session
[s
].flags
& SF_IPV6_ROUTED
)
1521 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1524 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1525 throttle_session(s
, 0, 0);
1529 controlt
*c
= controlnew(14); // sending CDN
1533 *(uint16_t *) buf
= htons(result
);
1534 *(uint16_t *) (buf
+2) = htons(error
);
1535 controlb(c
, 1, buf
, 4, 1);
1538 control16(c
, 1, result
, 1);
1540 control16(c
, 14, s
, 1); // assigned session (our end)
1541 controladd(c
, session
[s
].tunnel
, session
[s
].far
); // send the message
1544 if (!session
[s
].die
)
1545 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1547 // update filter refcounts
1548 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1549 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1551 cluster_send_session(s
);
1554 void sendipcp(tunnelidt t
, sessionidt s
)
1556 uint8_t buf
[MAXCONTROL
];
1557 uint16_t r
= sess_local
[s
].radius
;
1567 sessionshutdown(s
, "No free RADIUS sessions for IPCP", 3, 0);
1571 if (radius
[r
].state
!= RADIUSIPCP
)
1573 radius
[r
].state
= RADIUSIPCP
;
1577 radius
[r
].retry
= backoff(radius
[r
].try++);
1578 if (radius
[r
].try > 10)
1580 radiusclear(r
, s
); // Clear radius session.
1581 sessionshutdown(s
, "No reply to IPCP.", 3, 0);
1585 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1589 q
[1] = r
>> RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1590 *(uint16_t *) (q
+ 2) = htons(10);
1593 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1594 config
->bind_address
? config
->bind_address
:
1595 my_address
; // send my IP
1597 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1598 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1600 // If we have an IPv6 prefix length configured, assume we should
1601 // try to negotiate an IPv6 session as well. Unless we've had a
1602 // (N)ACK for IPV6CP.
1603 if (config
->ipv6_prefix
.s6_addr
[0] > 0 &&
1604 !(session
[s
].flags
& SF_IPV6CP_ACKED
) &&
1605 !(session
[s
].flags
& SF_IPV6_NACKED
))
1607 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1611 q
[1] = r
>> RADIUS_SHIFT
; // ID, don't care, we
1612 // only send one type
1614 *(uint16_t *) (q
+ 2) = htons(14);
1617 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1618 *(uint32_t *) (q
+ 10) = 0;
1621 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1625 static void sessionclear(sessionidt s
)
1627 memset(&session
[s
], 0, sizeof(session
[s
]));
1628 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1629 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1631 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1632 session
[s
].next
= sessionfree
;
1636 // kill a session now
1637 void sessionkill(sessionidt s
, char *reason
)
1642 if (!session
[s
].opened
) // not alive
1645 if (session
[s
].next
)
1647 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1651 session
[s
].die
= TIME
;
1652 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1653 if (sess_local
[s
].radius
)
1654 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1656 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1658 cluster_send_session(s
);
1661 static void tunnelclear(tunnelidt t
)
1664 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1665 tunnel
[t
].state
= TUNNELFREE
;
1668 // kill a tunnel now
1669 static void tunnelkill(tunnelidt t
, char *reason
)
1676 tunnel
[t
].state
= TUNNELDIE
;
1678 // free control messages
1679 while ((c
= tunnel
[t
].controls
))
1681 controlt
* n
= c
->next
;
1682 tunnel
[t
].controls
= n
;
1683 tunnel
[t
].controlc
--;
1684 c
->next
= controlfree
;
1688 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1689 if (session
[s
].tunnel
== t
)
1690 sessionkill(s
, reason
);
1694 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1695 cli_tunnel_actions
[t
].action
= 0;
1696 cluster_send_tunnel(t
);
1699 // shut down a tunnel cleanly
1700 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1704 CSTAT(tunnelshutdown
);
1706 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1708 // never set up, can immediately kill
1709 tunnelkill(t
, reason
);
1712 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1715 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1716 if (session
[s
].tunnel
== t
)
1717 sessionshutdown(s
, reason
, 0, 0);
1719 tunnel
[t
].state
= TUNNELDIE
;
1720 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1721 cluster_send_tunnel(t
);
1722 // TBA - should we wait for sessions to stop?
1725 controlt
*c
= controlnew(4); // sending StopCCN
1730 *(uint16_t *) buf
= htons(result
);
1731 *(uint16_t *) (buf
+2) = htons(error
);
1734 int m
= strlen(msg
);
1735 if (m
+ 4 > sizeof(buf
))
1736 m
= sizeof(buf
) - 4;
1738 memcpy(buf
+4, msg
, m
);
1742 controlb(c
, 1, buf
, l
, 1);
1745 control16(c
, 1, result
, 1);
1747 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1748 controladd(c
, t
, 0); // send the message
1752 // read and process packet on tunnel (UDP)
1753 void processudp(uint8_t * buf
, int len
, struct sockaddr_in
*addr
)
1755 char *chapresponse
= NULL
;
1756 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1757 uint8_t *p
= buf
+ 2;
1764 LOG_HEX(5, "UDP Data", buf
, len
);
1765 STAT(tunnel_rx_packets
);
1766 INC_STAT(tunnel_rx_bytes
, len
);
1769 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1770 STAT(tunnel_rx_errors
);
1773 if ((buf
[1] & 0x0F) != 2)
1775 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1776 STAT(tunnel_rx_errors
);
1781 l
= ntohs(*(uint16_t *) p
);
1784 t
= ntohs(*(uint16_t *) p
);
1786 s
= ntohs(*(uint16_t *) p
);
1788 if (s
>= MAXSESSION
)
1790 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1791 STAT(tunnel_rx_errors
);
1796 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1797 STAT(tunnel_rx_errors
);
1802 ns
= ntohs(*(uint16_t *) p
);
1804 nr
= ntohs(*(uint16_t *) p
);
1809 uint16_t o
= ntohs(*(uint16_t *) p
);
1814 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1815 STAT(tunnel_rx_errors
);
1821 uint16_t message
= 0xFFFF; // message type
1823 uint8_t mandatory
= 0;
1824 uint8_t authtype
= 0; // proxy auth type
1825 uint16_t asession
= 0; // assigned session
1826 uint32_t amagic
= 0; // magic number
1827 uint8_t aflags
= 0; // flags from last LCF
1828 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1829 char called
[MAXTEL
] = ""; // called number
1830 char calling
[MAXTEL
] = ""; // calling number
1832 if (!config
->cluster_iam_master
)
1834 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1838 // control messages must have bits 0x80|0x40|0x08
1839 // (type, length and sequence) set, and bits 0x02|0x01
1840 // (offset and priority) clear
1841 if ((*buf
& 0xCB) != 0xC8)
1843 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1844 STAT(tunnel_rx_errors
);
1848 // check for duplicate tunnel open message
1854 // Is this a duplicate of the first packet? (SCCRQ)
1856 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1858 if (tunnel
[i
].state
!= TUNNELOPENING
||
1859 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1860 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1863 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1868 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1869 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1871 // if no tunnel specified, assign one
1874 if (!(t
= new_tunnel()))
1876 LOG(1, 0, 0, "No more tunnels\n");
1877 STAT(tunnel_overflow
);
1881 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1882 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1883 tunnel
[t
].window
= 4; // default window
1884 STAT(tunnel_created
);
1885 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1886 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1889 // If the 'ns' just received is not the 'nr' we're
1890 // expecting, just send an ack and drop it.
1892 // if 'ns' is less, then we got a retransmitted packet.
1893 // if 'ns' is greater than missed a packet. Either way
1894 // we should ignore it.
1895 if (ns
!= tunnel
[t
].nr
)
1897 // is this the sequence we were expecting?
1898 STAT(tunnel_rx_errors
);
1899 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1900 t
, ns
, tunnel
[t
].nr
);
1902 if (l
) // Is this not a ZLB?
1907 // This is used to time out old tunnels
1908 tunnel
[t
].lastrec
= time_now
;
1910 // check sequence of this message
1912 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1913 // some to clear maybe?
1914 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1916 controlt
*c
= tunnel
[t
].controls
;
1917 tunnel
[t
].controls
= c
->next
;
1918 tunnel
[t
].controlc
--;
1919 c
->next
= controlfree
;
1922 tunnel
[t
].try = 0; // we have progress
1925 // receiver advance (do here so quoted correctly in any sends below)
1926 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1927 if (skip
< 0) skip
= 0;
1928 if (skip
< tunnel
[t
].controlc
)
1930 // some control packets can now be sent that were previous stuck out of window
1931 int tosend
= tunnel
[t
].window
- skip
;
1932 controlt
*c
= tunnel
[t
].controls
;
1940 tunnel
[t
].try = 0; // first send
1941 tunnelsend(c
->buf
, c
->length
, t
);
1946 if (!tunnel
[t
].controlc
)
1947 tunnel
[t
].retry
= 0; // caught up
1950 { // if not a null message
1956 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1958 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1964 LOG(1, s
, t
, "Invalid length in AVP\n");
1965 STAT(tunnel_rx_errors
);
1970 if (flags
& 0x3C) // reserved bits, should be clear
1972 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1974 result
= 2; // general error
1975 error
= 3; // reserved field non-zero
1980 if (*(uint16_t *) (b
))
1982 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1984 result
= 2; // general error
1985 error
= 6; // generic vendor-specific error
1986 msg
= "unsupported vendor-specific";
1990 mtype
= ntohs(*(uint16_t *) (b
));
1998 // handle hidden AVPs
1999 if (!*config
->l2tpsecret
)
2001 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2003 result
= 2; // general error
2004 error
= 6; // generic vendor-specific error
2005 msg
= "secret not specified";
2008 if (!session
[s
].random_vector_length
)
2010 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2012 result
= 2; // general error
2013 error
= 6; // generic
2014 msg
= "no random vector";
2019 LOG(2, s
, t
, "Short hidden AVP.\n");
2021 result
= 2; // general error
2022 error
= 2; // length is wrong
2028 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2030 orig_len
= ntohs(*(uint16_t *) b
);
2031 if (orig_len
> n
+ 2)
2033 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2037 result
= 2; // general error
2038 error
= 2; // length is wrong
2047 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, avp_name(mtype
), n
,
2048 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2052 case 0: // message type
2053 message
= ntohs(*(uint16_t *) b
);
2054 mandatory
= flags
& 0x80;
2055 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_message_type(message
));
2057 case 1: // result code
2059 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2060 const char* resdesc
= "(unknown)";
2063 resdesc
= stopccn_result_code(rescode
);
2065 else if (message
== 14)
2067 resdesc
= cdn_result_code(rescode
);
2070 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2073 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2074 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, error_code(errcode
));
2077 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2082 case 2: // protocol version
2084 version
= ntohs(*(uint16_t *) (b
));
2085 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2086 if (version
&& version
!= 0x0100)
2087 { // allow 0.0 and 1.0
2088 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2090 result
= 5; // unspported protocol version
2091 error
= 0x0100; // supported version
2097 case 3: // framing capabilities
2098 // LOG(4, s, t, "Framing capabilities\n");
2100 case 4: // bearer capabilities
2101 // LOG(4, s, t, "Bearer capabilities\n");
2103 case 5: // tie breaker
2104 // We never open tunnels, so we don't care about tie breakers
2105 // LOG(4, s, t, "Tie breaker\n");
2107 case 6: // firmware revision
2108 // LOG(4, s, t, "Firmware revision\n");
2110 case 7: // host name
2111 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2112 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2113 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2114 // TBA - to send to RADIUS
2116 case 8: // vendor name
2117 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2118 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2119 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2121 case 9: // assigned tunnel
2122 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2123 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2125 case 10: // rx window
2126 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2127 if (!tunnel
[t
].window
)
2128 tunnel
[t
].window
= 1; // window of 0 is silly
2129 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2131 case 11: // Challenge
2133 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2134 build_chap_response(b
, 2, n
, &chapresponse
);
2137 case 13: // Response
2138 // Why did they send a response? We never challenge.
2139 LOG(2, s
, t
, " received unexpected challenge response\n");
2142 case 14: // assigned session
2143 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2144 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2146 case 15: // call serial number
2147 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2149 case 18: // bearer type
2150 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2153 case 19: // framing type
2154 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2157 case 21: // called number
2158 memset(called
, 0, sizeof(called
));
2159 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2160 LOG(4, s
, t
, " Called <%s>\n", called
);
2162 case 22: // calling number
2163 memset(calling
, 0, sizeof(calling
));
2164 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2165 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2169 case 24: // tx connect speed
2172 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2176 // AS5300s send connect speed as a string
2178 memset(tmp
, 0, sizeof(tmp
));
2179 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2180 session
[s
].tx_connect_speed
= atol(tmp
);
2182 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2184 case 38: // rx connect speed
2187 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2191 // AS5300s send connect speed as a string
2193 memset(tmp
, 0, sizeof(tmp
));
2194 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2195 session
[s
].rx_connect_speed
= atol(tmp
);
2197 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2199 case 25: // Physical Channel ID
2201 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2202 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2205 case 29: // Proxy Authentication Type
2207 uint16_t atype
= ntohs(*(uint16_t *)b
);
2208 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, auth_type(atype
));
2210 authtype
= AUTHCHAP
;
2211 else if (atype
== 3)
2216 case 30: // Proxy Authentication Name
2219 memset(authname
, 0, sizeof(authname
));
2220 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2221 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2225 case 31: // Proxy Authentication Challenge
2227 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2228 if (sess_local
[s
].radius
)
2229 memcpy(radius
[sess_local
[s
].radius
].auth
, b
, 16);
2232 case 32: // Proxy Authentication ID
2234 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2235 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2236 if (sess_local
[s
].radius
)
2237 radius
[sess_local
[s
].radius
].id
= authid
;
2240 case 33: // Proxy Authentication Response
2241 LOG(4, s
, t
, " Proxy Auth Response\n");
2243 case 27: // last sent lcp
2244 { // find magic number
2245 uint8_t *p
= b
, *e
= p
+ n
;
2246 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2248 if (*p
== 5 && p
[1] == 6) // Magic-Number
2249 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2250 else if (*p
== 3 && p
[1] == 4 && *(uint16_t *) (p
+ 2) == htons(PPPPAP
)) // Authentication-Protocol (PAP)
2252 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol (CHAP)
2253 authtype
= AUTHCHAP
;
2254 else if (*p
== 7) // Protocol-Field-Compression
2255 aflags
|= SESSIONPFC
;
2256 else if (*p
== 8) // Address-and-Control-Field-Compression
2257 aflags
|= SESSIONACFC
;
2262 case 28: // last recv lcp confreq
2264 case 26: // Initial Received LCP CONFREQ
2266 case 39: // seq required - we control it as an LNS anyway...
2268 case 36: // Random Vector
2269 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2270 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2271 if (n
> sizeof(session
[s
].random_vector
))
2272 n
= sizeof(session
[s
].random_vector
);
2273 memcpy(session
[s
].random_vector
, b
, n
);
2274 session
[s
].random_vector_length
= n
;
2278 static char e
[] = "unknown AVP 0xXXXX";
2279 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2281 result
= 2; // general error
2282 error
= 8; // unknown mandatory AVP
2283 sprintf((msg
= e
) + 14, "%04x", mtype
);
2290 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2294 case 1: // SCCRQ - Start Control Connection Request
2295 tunnel
[t
].state
= TUNNELOPENING
;
2296 if (main_quit
!= QUIT_SHUTDOWN
)
2298 controlt
*c
= controlnew(2); // sending SCCRP
2299 control16(c
, 2, version
, 1); // protocol version
2300 control32(c
, 3, 3, 1); // framing
2301 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2302 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2303 control16(c
, 9, t
, 1); // assigned tunnel
2304 controladd(c
, t
, 0); // send the resply
2308 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2312 tunnel
[t
].state
= TUNNELOPEN
;
2315 tunnel
[t
].state
= TUNNELOPEN
;
2316 controlnull(t
); // ack
2319 controlnull(t
); // ack
2320 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2323 controlnull(t
); // simply ACK
2335 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2340 sessionfree
= session
[s
].next
;
2341 memset(&session
[s
], 0, sizeof(session
[s
]));
2343 if (s
> config
->cluster_highest_sessionid
)
2344 config
->cluster_highest_sessionid
= s
;
2346 // make a RADIUS session
2347 if ((r
= radiusnew(s
)))
2349 controlt
*c
= controlnew(11); // sending ICRP
2350 session
[s
].opened
= time_now
;
2351 session
[s
].tunnel
= t
;
2352 session
[s
].far
= asession
;
2353 session
[s
].last_packet
= time_now
;
2354 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2355 control16(c
, 14, s
, 1); // assigned session
2356 controladd(c
, t
, asession
); // send the reply
2358 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
2359 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2360 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2361 STAT(session_created
);
2366 LOG(1, s
, t
, "No free RADIUS sessions for ICRQ\n");
2371 STAT(session_overflow
);
2372 LOG(1, 0, t
, "No free sessions\n");
2376 controlt
*c
= controlnew(14); // CDN
2377 if (main_quit
== QUIT_SHUTDOWN
)
2378 control16(c
, 1, 2, 7); // try another
2380 control16(c
, 1, 4, 0); // temporary lack of resources
2382 controladd(c
, t
, asession
); // send the message
2389 if (amagic
== 0) amagic
= time_now
;
2390 session
[s
].magic
= amagic
; // set magic number
2391 session
[s
].l2tp_flags
= aflags
; // set flags received
2392 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2393 controlnull(t
); // ack
2394 // proxy authentication type is not supported
2395 if (!(config
->radius_authtypes
& authtype
))
2396 authtype
= config
->radius_authprefer
;
2399 sendlcp(t
, s
, authtype
);
2402 controlnull(t
); // ack
2403 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2406 LOG(1, s
, t
, "Missing message type\n");
2409 STAT(tunnel_rx_errors
);
2411 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2413 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2416 if (chapresponse
) free(chapresponse
);
2417 cluster_send_tunnel(t
);
2421 LOG(4, s
, t
, " Got a ZLB ack\n");
2428 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2429 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2430 { // HDLC address header, discard
2436 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2437 STAT(tunnel_rx_errors
);
2447 prot
= ntohs(*(uint16_t *) p
);
2452 if (s
&& !session
[s
].opened
) // Is something wrong??
2454 if (!config
->cluster_iam_master
)
2456 // Pass it off to the master to deal with..
2457 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2462 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2463 STAT(tunnel_rx_errors
);
2469 session
[s
].last_packet
= time_now
;
2470 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2471 processpap(t
, s
, p
, l
);
2473 else if (prot
== PPPCHAP
)
2475 session
[s
].last_packet
= time_now
;
2476 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2477 processchap(t
, s
, p
, l
);
2479 else if (prot
== PPPLCP
)
2481 session
[s
].last_packet
= time_now
;
2482 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2483 processlcp(t
, s
, p
, l
);
2485 else if (prot
== PPPIPCP
)
2487 session
[s
].last_packet
= time_now
;
2488 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2489 processipcp(t
, s
, p
, l
);
2491 else if (prot
== PPPIPV6CP
)
2493 if (config
->ipv6_prefix
.s6_addr
[0] > 0)
2495 session
[s
].last_packet
= time_now
;
2496 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2497 processipv6cp(t
, s
, p
, l
);
2501 LOG(1, s
, t
, "IPv6 not configured; ignoring IPv6CP\n");
2504 else if (prot
== PPPCCP
)
2506 session
[s
].last_packet
= time_now
;
2507 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2508 processccp(t
, s
, p
, l
);
2510 else if (prot
== PPPIP
)
2514 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2515 return; // closing session, PPP not processed
2518 session
[s
].last_packet
= time_now
;
2519 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2521 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2525 processipin(t
, s
, p
, l
);
2527 else if (prot
== PPPIPV6
)
2529 if (!config
->ipv6_prefix
.s6_addr
[0] > 0)
2531 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2536 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2537 return; // closing session, PPP not processed
2540 session
[s
].last_packet
= time_now
;
2541 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2543 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2547 processipv6in(t
, s
, p
, l
);
2551 STAT(tunnel_rx_errors
);
2552 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2557 // read and process packet on tun
2558 static void processtun(uint8_t * buf
, int len
)
2560 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2561 STAT(tun_rx_packets
);
2562 INC_STAT(tun_rx_bytes
, len
);
2570 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2571 STAT(tun_rx_errors
);
2575 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2576 processipout(buf
, len
);
2577 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2578 && config
->ipv6_prefix
.s6_addr
[0] > 0)
2579 processipv6out(buf
, len
);
2584 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2585 // that we look at the whole of the tunnel, radius and session tables
2587 static void regular_cleanups(double period
)
2589 // Next tunnel, radius and session to check for actions on.
2590 static tunnelidt t
= 0;
2592 static sessionidt s
= 0;
2605 // divide up tables into slices based on the last run
2606 t_slice
= config
->cluster_highest_tunnelid
* period
;
2607 r_slice
= (MAXRADIUS
- 1) * period
;
2608 s_slice
= config
->cluster_highest_sessionid
* period
;
2612 else if (t_slice
> config
->cluster_highest_tunnelid
)
2613 t_slice
= config
->cluster_highest_tunnelid
;
2617 else if (r_slice
> (MAXRADIUS
- 1))
2618 r_slice
= MAXRADIUS
- 1;
2622 else if (s_slice
> config
->cluster_highest_sessionid
)
2623 s_slice
= config
->cluster_highest_sessionid
;
2625 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2627 for (i
= 0; i
< t_slice
; i
++)
2630 if (t
> config
->cluster_highest_tunnelid
)
2633 // check for expired tunnels
2634 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2636 STAT(tunnel_timeout
);
2637 tunnelkill(t
, "Expired");
2641 // check for message resend
2642 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2644 // resend pending messages as timeout on reply
2645 if (tunnel
[t
].retry
<= TIME
)
2647 controlt
*c
= tunnel
[t
].controls
;
2648 uint8_t w
= tunnel
[t
].window
;
2649 tunnel
[t
].try++; // another try
2650 if (tunnel
[t
].try > 5)
2651 tunnelkill(t
, "Timeout on control message"); // game over
2655 tunnelsend(c
->buf
, c
->length
, t
);
2663 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2665 controlt
*c
= controlnew(6); // sending HELLO
2666 controladd(c
, t
, 0); // send the message
2667 LOG(3, 0, t
, "Sending HELLO message\n");
2671 // Check for tunnel changes requested from the CLI
2672 if ((a
= cli_tunnel_actions
[t
].action
))
2674 cli_tunnel_actions
[t
].action
= 0;
2675 if (a
& CLI_TUN_KILL
)
2677 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2678 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2684 for (i
= 0; i
< r_slice
; i
++)
2690 if (!radius
[r
].state
)
2693 if (radius
[r
].retry
<= TIME
)
2700 for (i
= 0; i
< s_slice
; i
++)
2703 if (s
> config
->cluster_highest_sessionid
)
2706 if (!session
[s
].opened
) // Session isn't in use
2709 // check for expired sessions
2712 if (session
[s
].die
<= TIME
)
2714 sessionkill(s
, "Expired");
2720 if (session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
)
2721 && !(sess_local
[s
].radius
&& radius
[sess_local
[s
].radius
].state
== RADIUSIPCP
))
2723 // IPCP has not completed yet. Resend
2724 LOG(3, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2725 sendipcp(session
[s
].tunnel
, s
);
2729 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2730 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2732 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2733 STAT(session_timeout
);
2738 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2739 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2741 uint8_t b
[MAXCONTROL
] = {0};
2743 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2747 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2748 *(uint16_t *)(q
+ 2) = htons(8); // Length
2749 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2751 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2752 (int)(time_now
- session
[s
].last_packet
));
2753 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2757 // Check for actions requested from the CLI
2758 if ((a
= cli_session_actions
[s
].action
))
2762 cli_session_actions
[s
].action
= 0;
2763 if (a
& CLI_SESS_KILL
)
2765 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2766 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2767 a
= 0; // dead, no need to check for other actions
2771 if (a
& CLI_SESS_NOSNOOP
)
2773 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2774 session
[s
].snoop_ip
= 0;
2775 session
[s
].snoop_port
= 0;
2779 else if (a
& CLI_SESS_SNOOP
)
2781 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2782 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2783 cli_session_actions
[s
].snoop_port
);
2785 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2786 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2791 if (a
& CLI_SESS_NOTHROTTLE
)
2793 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2794 throttle_session(s
, 0, 0);
2798 else if (a
& CLI_SESS_THROTTLE
)
2800 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2801 cli_session_actions
[s
].throttle_in
,
2802 cli_session_actions
[s
].throttle_out
);
2804 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2809 if (a
& CLI_SESS_NOFILTER
)
2811 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2812 filter_session(s
, 0, 0);
2816 else if (a
& CLI_SESS_FILTER
)
2818 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2819 cli_session_actions
[s
].filter_in
,
2820 cli_session_actions
[s
].filter_out
);
2822 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2828 cluster_send_session(s
);
2831 // RADIUS interim accounting
2832 if (config
->radius_accounting
&& config
->radius_interim
> 0
2833 && session
[s
].ip
&& !session
[s
].walled_garden
2834 && !sess_local
[s
].radius
// RADIUS already in progress
2835 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2837 int rad
= radiusnew(s
);
2840 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2841 STAT(radius_overflow
);
2845 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2846 session
[s
].user
, session
[s
].unique_id
);
2848 radiussend(rad
, RADIUSINTERIM
);
2849 sess_local
[s
].last_interim
= time_now
;
2854 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
2855 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
2859 // Are we in the middle of a tunnel update, or radius
2862 static int still_busy(void)
2865 static clockt last_talked
= 0;
2866 static clockt start_busy_wait
= 0;
2868 if (!config
->cluster_iam_master
)
2871 static time_t stopped_bgp
= 0;
2876 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
2878 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2879 if (bgp_peers
[i
].state
== Established
)
2880 bgp_stop(&bgp_peers
[i
]);
2882 stopped_bgp
= time_now
;
2884 // we don't want to become master
2885 cluster_send_ping(0);
2890 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
2898 if (main_quit
== QUIT_SHUTDOWN
)
2900 static int dropped
= 0;
2905 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
2906 for (i
= 1; i
< MAXTUNNEL
; i
++)
2907 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
2908 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
2914 if (start_busy_wait
== 0)
2915 start_busy_wait
= TIME
;
2917 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2919 if (!tunnel
[i
].controlc
)
2922 if (last_talked
!= TIME
)
2924 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
2930 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2931 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2933 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2937 for (i
= 1; i
< MAXRADIUS
; i
++)
2939 if (radius
[i
].state
== RADIUSNULL
)
2941 if (radius
[i
].state
== RADIUSWAIT
)
2944 if (last_talked
!= TIME
)
2946 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2956 # include <sys/epoll.h>
2958 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
2959 # include "fake_epoll.h"
2962 // the base set of fds polled: control, cli, udp, tun, cluster
2965 // additional polled fds
2967 # define EXTRA_FDS BGP_NUM_PEERS
2969 # define EXTRA_FDS 0
2972 // main loop - gets packets on tun or udp and processes them
2973 static void mainloop(void)
2977 clockt next_cluster_ping
= 0; // send initial ping immediately
2978 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
2979 int maxevent
= sizeof(events
)/sizeof(*events
);
2981 if ((epollfd
= epoll_create(maxevent
)) < 0)
2983 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
2987 LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2988 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2990 /* setup our fds to poll for input */
2992 static struct event_data d
[BASE_FDS
];
2993 struct epoll_event e
;
2998 d
[i
].type
= FD_TYPE_CONTROL
;
2999 e
.data
.ptr
= &d
[i
++];
3000 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3002 d
[i
].type
= FD_TYPE_CLI
;
3003 e
.data
.ptr
= &d
[i
++];
3004 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3006 d
[i
].type
= FD_TYPE_UDP
;
3007 e
.data
.ptr
= &d
[i
++];
3008 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3010 d
[i
].type
= FD_TYPE_TUN
;
3011 e
.data
.ptr
= &d
[i
++];
3012 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3014 d
[i
].type
= FD_TYPE_CLUSTER
;
3015 e
.data
.ptr
= &d
[i
++];
3016 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3020 signal(SIGPIPE
, SIG_IGN
);
3021 bgp_setup(config
->as_number
);
3022 if (config
->bind_address
)
3023 bgp_add_route(config
->bind_address
, 0xffffffff);
3025 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3027 if (config
->neighbour
[i
].name
[0])
3028 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3029 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3030 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3034 while (!main_quit
|| still_busy())
3039 if (config
->reload_config
)
3041 // Update the config state based on config settings
3049 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3050 STAT(select_called
);
3055 if (errno
== EINTR
||
3056 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3059 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3065 struct sockaddr_in addr
;
3069 int cluster_ready
= 0;
3072 int cluster_pkts
= 0;
3074 uint32_t bgp_events
[BGP_NUM_PEERS
];
3075 memset(bgp_events
, 0, sizeof(bgp_events
));
3078 for (c
= n
, i
= 0; i
< c
; i
++)
3080 struct event_data
*d
= events
[i
].data
.ptr
;
3083 case FD_TYPE_CONTROL
: // nsctl commands
3084 alen
= sizeof(addr
);
3085 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3089 case FD_TYPE_CLI
: // CLI connections
3093 alen
= sizeof(addr
);
3094 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3100 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3106 // these are handled below, with multiple interleaved reads
3107 case FD_TYPE_UDP
: udp_ready
++; break;
3108 case FD_TYPE_TUN
: tun_ready
++; break;
3109 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3111 case FD_TYPE_RADIUS
: // RADIUS response
3112 s
= recv(radfds
[d
->index
], buf
, sizeof(buf
), 0);
3113 if (s
>= 0 && config
->cluster_iam_master
)
3114 processrad(buf
, s
, d
->index
);
3121 bgp_events
[d
->index
] = events
[i
].events
;
3127 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3132 bgp_process(bgp_events
);
3135 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3140 alen
= sizeof(addr
);
3141 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3143 processudp(buf
, s
, &addr
);
3156 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3171 alen
= sizeof(addr
);
3172 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3174 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3185 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3186 STAT(multi_read_used
);
3188 if (c
>= config
->multi_read_count
)
3190 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3191 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3193 STAT(multi_read_exceeded
);
3198 // Runs on every machine (master and slaves).
3199 if (next_cluster_ping
<= TIME
)
3201 // Check to see which of the cluster is still alive..
3203 cluster_send_ping(basetime
); // Only does anything if we're a slave
3204 cluster_check_master(); // ditto.
3206 cluster_heartbeat(); // Only does anything if we're a master.
3207 cluster_check_slaves(); // ditto.
3209 master_update_counts(); // If we're a slave, send our byte counters to our master.
3211 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3212 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3214 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3217 if (!config
->cluster_iam_master
)
3220 // Run token bucket filtering queue..
3221 // Only run it every 1/10th of a second.
3223 static clockt last_run
= 0;
3224 if (last_run
!= TIME
)
3231 // Handle timeouts, retries etc.
3233 static double last_clean
= 0;
3237 TIME
= now(&this_clean
);
3238 diff
= this_clean
- last_clean
;
3240 // Run during idle time (after we've handled
3241 // all incoming packets) or every 1/10th sec
3242 if (!more
|| diff
> 0.1)
3244 regular_cleanups(diff
);
3245 last_clean
= this_clean
;
3249 if (*config
->accounting_dir
)
3251 static clockt next_acct
= 0;
3252 static clockt next_shut_acct
= 0;
3254 if (next_acct
<= TIME
)
3256 // Dump accounting data
3257 next_acct
= TIME
+ ACCT_TIME
;
3258 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3261 else if (next_shut_acct
<= TIME
)
3263 // Dump accounting data for shutdown sessions
3264 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3271 // Are we the master and shutting down??
3272 if (config
->cluster_iam_master
)
3273 cluster_heartbeat(); // Flush any queued changes..
3275 // Ok. Notify everyone we're shutting down. If we're
3276 // the master, this will force an election.
3277 cluster_send_ping(0);
3280 // Important!!! We MUST not process any packets past this point!
3281 LOG(1, 0, 0, "Shutdown complete\n");
3284 static void stripdomain(char *host
)
3288 if ((p
= strchr(host
, '.')))
3294 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3300 while (fgets(buf
, sizeof(buf
), resolv
))
3302 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3305 if (!isspace(buf
[6]))
3309 while (isspace(*b
)) b
++;
3314 while (*b
&& !isspace(*b
)) b
++;
3316 if (buf
[0] == 'd') // domain is canonical
3322 // first search line
3325 // hold, may be subsequent domain line
3326 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3337 int hl
= strlen(host
);
3338 int dl
= strlen(domain
);
3339 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3340 host
[hl
-dl
- 1] = 0;
3344 *p
= 0; // everything after first dot
3349 // Init data structures
3350 static void initdata(int optdebug
, char *optconfig
)
3354 if (!(config
= shared_malloc(sizeof(configt
))))
3356 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3360 memset(config
, 0, sizeof(configt
));
3361 time(&config
->start_time
);
3362 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3363 config
->debug
= optdebug
;
3364 config
->num_tbfs
= MAXTBFS
;
3365 config
->rl_rate
= 28; // 28kbps
3366 config
->cluster_master_min_adv
= 1;
3367 strcpy(config
->random_device
, RANDOMDEVICE
);
3369 log_stream
= stderr
;
3372 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3374 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3377 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3380 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3382 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3385 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3387 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3390 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3392 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3396 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3398 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3402 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3404 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3408 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3410 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3414 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3416 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3419 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3421 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3423 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3426 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3428 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3430 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3433 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3435 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3436 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3437 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3438 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3440 // Put all the sessions on the free list marked as undefined.
3441 for (i
= 1; i
< MAXSESSION
; i
++)
3443 session
[i
].next
= i
+ 1;
3444 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3446 session
[MAXSESSION
- 1].next
= 0;
3449 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3450 for (i
= 1; i
< MAXTUNNEL
; i
++)
3451 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3455 // Grab my hostname unless it's been specified
3456 gethostname(hostname
, sizeof(hostname
));
3457 stripdomain(hostname
);
3460 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3463 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3465 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3471 static int assign_ip_address(sessionidt s
)
3475 time_t best_time
= time_now
;
3476 char *u
= session
[s
].user
;
3480 CSTAT(assign_ip_address
);
3482 for (i
= 1; i
< ip_pool_size
; i
++)
3484 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3487 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3494 if (ip_address_pool
[i
].last
< best_time
)
3497 if (!(best_time
= ip_address_pool
[i
].last
))
3498 break; // never used, grab this one
3504 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3508 session
[s
].ip
= ip_address_pool
[best
].address
;
3509 session
[s
].ip_pool_index
= best
;
3510 ip_address_pool
[best
].assigned
= 1;
3511 ip_address_pool
[best
].last
= time_now
;
3512 ip_address_pool
[best
].session
= s
;
3513 if (session
[s
].walled_garden
)
3514 /* Don't track addresses of users in walled garden (note: this
3515 means that their address isn't "sticky" even if they get
3517 ip_address_pool
[best
].user
[0] = 0;
3519 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3522 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3523 reuse
? "Reusing" : "Allocating", best
);
3528 static void free_ip_address(sessionidt s
)
3530 int i
= session
[s
].ip_pool_index
;
3533 CSTAT(free_ip_address
);
3536 return; // what the?
3538 if (i
< 0) // Is this actually part of the ip pool?
3542 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3544 ip_address_pool
[i
].assigned
= 0;
3545 ip_address_pool
[i
].session
= 0;
3546 ip_address_pool
[i
].last
= time_now
;
3550 // Fsck the address pool against the session table.
3551 // Normally only called when we become a master.
3553 // This isn't perfect: We aren't keep tracking of which
3554 // users used to have an IP address.
3556 void rebuild_address_pool(void)
3561 // Zero the IP pool allocation, and build
3562 // a map from IP address to pool index.
3563 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3565 ip_address_pool
[i
].assigned
= 0;
3566 ip_address_pool
[i
].session
= 0;
3567 if (!ip_address_pool
[i
].address
)
3570 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3573 for (i
= 0; i
< MAXSESSION
; ++i
)
3576 if (!(session
[i
].opened
&& session
[i
].ip
))
3579 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3581 if (session
[i
].ip_pool_index
< 0)
3583 // Not allocated out of the pool.
3584 if (ipid
< 1) // Not found in the pool either? good.
3587 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3588 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3590 // Fall through and process it as part of the pool.
3594 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3596 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3598 session
[i
].ip_pool_index
= ipid
;
3602 ip_address_pool
[ipid
].assigned
= 1;
3603 ip_address_pool
[ipid
].session
= i
;
3604 ip_address_pool
[ipid
].last
= time_now
;
3605 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3606 session
[i
].ip_pool_index
= ipid
;
3607 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3612 // Fix the address pool to match a changed session.
3613 // (usually when the master sends us an update).
3614 static void fix_address_pool(int sid
)
3618 ipid
= session
[sid
].ip_pool_index
;
3620 if (ipid
> ip_pool_size
)
3621 return; // Ignore it. rebuild_address_pool will fix it up.
3623 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3624 return; // Just ignore it. rebuild_address_pool will take care of it.
3626 ip_address_pool
[ipid
].assigned
= 1;
3627 ip_address_pool
[ipid
].session
= sid
;
3628 ip_address_pool
[ipid
].last
= time_now
;
3629 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3633 // Add a block of addresses to the IP pool to hand out.
3635 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3639 mask
= 0xffffffff; // Host route only.
3643 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3646 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3648 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3649 continue; // Skip 0 and broadcast addresses.
3651 ip_address_pool
[ip_pool_size
].address
= i
;
3652 ip_address_pool
[ip_pool_size
].assigned
= 0;
3654 if (ip_pool_size
>= MAXIPPOOL
)
3656 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3662 // Initialize the IP address pool
3663 static void initippool()
3668 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3670 if (!(f
= fopen(IPPOOLFILE
, "r")))
3672 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3676 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3679 buf
[4095] = 0; // Force it to be zero terminated/
3681 if (*buf
== '#' || *buf
== '\n')
3682 continue; // Skip comments / blank lines
3683 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3684 if ((p
= (char *)strchr(buf
, ':')))
3688 src
= inet_addr(buf
);
3689 if (src
== INADDR_NONE
)
3691 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3694 // This entry is for a specific IP only
3695 if (src
!= config
->bind_address
)
3700 if ((p
= (char *)strchr(pool
, '/')))
3704 in_addr_t start
= 0, mask
= 0;
3706 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3708 if (!*p
|| !(numbits
= atoi(p
)))
3710 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3713 start
= ntohl(inet_addr(pool
));
3714 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3716 // Add a static route for this pool
3717 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3718 fmtaddr(htonl(start
), 0), 32 + mask
);
3720 routeset(0, start
, mask
, 0, 1);
3722 add_to_ip_pool(start
, mask
);
3726 // It's a single ip address
3727 add_to_ip_pool(inet_addr(pool
), 0);
3731 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3734 void snoop_send_packet(char *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3736 struct sockaddr_in snoop_addr
= {0};
3737 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3740 snoop_addr
.sin_family
= AF_INET
;
3741 snoop_addr
.sin_addr
.s_addr
= destination
;
3742 snoop_addr
.sin_port
= ntohs(port
);
3744 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3745 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3746 htons(snoop_addr
.sin_port
));
3748 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3749 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3751 STAT(packets_snooped
);
3754 static int dump_session(FILE **f
, sessiont
*s
)
3756 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
3761 char filename
[1024];
3763 time_t now
= time(NULL
);
3765 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3766 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3768 if (!(*f
= fopen(filename
, "w")))
3770 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3774 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3775 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3780 "# format: username ip qos uptxoctets downrxoctets\n",
3782 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
3787 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3788 fprintf(*f
, "%s %s %d %u %u\n",
3789 s
->user
, // username
3790 fmtaddr(htonl(s
->ip
), 0), // ip
3791 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3792 (uint32_t) s
->cin_delta
, // uptxoctets
3793 (uint32_t) s
->cout_delta
); // downrxoctets
3795 s
->cin_delta
= s
->cout_delta
= 0;
3800 static void dump_acct_info(int all
)
3806 CSTAT(dump_acct_info
);
3810 for (i
= 0; i
< shut_acct_n
; i
++)
3811 dump_session(&f
, &shut_acct
[i
]);
3817 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3818 dump_session(&f
, &session
[i
]);
3825 int main(int argc
, char *argv
[])
3829 char *optconfig
= CONFIGFILE
;
3831 time(&basetime
); // start clock
3834 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3839 if (fork()) exit(0);
3841 freopen("/dev/null", "r", stdin
);
3842 freopen("/dev/null", "w", stdout
);
3843 freopen("/dev/null", "w", stderr
);
3852 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3855 printf("Args are:\n"
3856 "\t-d\t\tDetach from terminal\n"
3857 "\t-c <file>\tConfig file\n"
3858 "\t-h <hostname>\tForce hostname\n"
3866 // Start the timer routine off
3868 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3869 signal(SIGALRM
, sigalrm_handler
);
3870 siginterrupt(SIGALRM
, 0);
3873 initdata(optdebug
, optconfig
);
3877 init_tbf(config
->num_tbfs
);
3879 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3880 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3881 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3884 rlim
.rlim_cur
= RLIM_INFINITY
;
3885 rlim
.rlim_max
= RLIM_INFINITY
;
3886 // Remove the maximum core size
3887 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3888 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3890 // Make core dumps go to /tmp
3894 if (config
->scheduler_fifo
)
3897 struct sched_param params
= {0};
3898 params
.sched_priority
= 1;
3900 if (get_nprocs() < 2)
3902 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3903 config
->scheduler_fifo
= 0;
3907 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3909 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3913 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3914 config
->scheduler_fifo
= 0;
3919 /* Set up the cluster communications port. */
3920 if (cluster_init() < 0)
3924 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3932 unsigned seed
= time_now
^ getpid();
3933 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
3937 signal(SIGHUP
, sighup_handler
);
3938 signal(SIGCHLD
, sigchild_handler
);
3939 signal(SIGTERM
, shutdown_handler
);
3940 signal(SIGINT
, shutdown_handler
);
3941 signal(SIGQUIT
, shutdown_handler
);
3943 // Prevent us from getting paged out
3944 if (config
->lock_pages
)
3946 if (!mlockall(MCL_CURRENT
))
3947 LOG(1, 0, 0, "Locking pages into memory\n");
3949 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3954 // Drop privileges here
3955 if (config
->target_uid
> 0 && geteuid() == 0)
3956 setuid(config
->target_uid
);
3960 /* remove plugins (so cleanup code gets run) */
3963 // Remove the PID file if we wrote it
3964 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3965 unlink(config
->pid_file
);
3967 /* kill CLI children */
3968 signal(SIGTERM
, SIG_IGN
);
3973 static void sighup_handler(int sig
)
3977 if (log_stream
!= stderr
)
3986 static void sigalrm_handler(int sig
)
3988 // Log current traffic stats
3990 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3991 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3992 (udp_rx
/ 1024.0 / 1024.0 * 8),
3993 (eth_tx
/ 1024.0 / 1024.0 * 8),
3994 (eth_rx
/ 1024.0 / 1024.0 * 8),
3995 (udp_tx
/ 1024.0 / 1024.0 * 8),
3996 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3997 udp_rx_pkt
, eth_rx_pkt
);
3999 udp_tx
= udp_rx
= 0;
4000 udp_rx_pkt
= eth_rx_pkt
= 0;
4001 eth_tx
= eth_rx
= 0;
4003 if (config
->dump_speed
)
4004 printf("%s\n", config
->bandwidth
);
4006 // Update the internal time counter
4008 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4013 struct param_timer p
= { time_now
};
4014 run_plugins(PLUGIN_TIMER
, &p
);
4019 static void shutdown_handler(int sig
)
4021 LOG(1, 0, 0, "Shutting down\n");
4022 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4025 static void sigchild_handler(int sig
)
4027 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4031 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
)
4034 *challenge_response
= NULL
;
4036 if (!*config
->l2tpsecret
)
4038 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4042 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4044 *challenge_response
= (char *)calloc(17, 1);
4047 MD5Update(&ctx
, &id
, 1);
4048 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4049 MD5Update(&ctx
, challenge
, challenge_length
);
4050 MD5Final(*challenge_response
, &ctx
);
4055 static int facility_value(char *name
)
4058 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4060 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4061 return facilitynames
[i
].c_val
;
4066 static void update_config()
4070 static int timeout
= 0;
4071 static int interval
= 0;
4078 if (log_stream
!= stderr
)
4084 if (*config
->log_filename
)
4086 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4088 char *p
= config
->log_filename
+ 7;
4091 openlog("l2tpns", LOG_PID
, facility_value(p
));
4095 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4097 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4099 fseek(log_stream
, 0, SEEK_END
);
4100 setbuf(log_stream
, NULL
);
4104 log_stream
= stderr
;
4105 setbuf(log_stream
, NULL
);
4111 log_stream
= stderr
;
4112 setbuf(log_stream
, NULL
);
4116 config
->numradiusservers
= 0;
4117 for (i
= 0; i
< MAXRADSERVER
; i
++)
4118 if (config
->radiusserver
[i
])
4120 config
->numradiusservers
++;
4121 // Set radius port: if not set, take the port from the
4122 // first radius server. For the first radius server,
4123 // take the #defined default value from l2tpns.h
4125 // test twice, In case someone works with
4126 // a secondary radius server without defining
4127 // a primary one, this will work even then.
4128 if (i
> 0 && !config
->radiusport
[i
])
4129 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4130 if (!config
->radiusport
[i
])
4131 config
->radiusport
[i
] = RADPORT
;
4134 if (!config
->numradiusservers
)
4135 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4137 // parse radius_authtypes_s
4138 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4139 p
= config
->radius_authtypes_s
;
4142 char *s
= strpbrk(p
, " \t,");
4148 while (*s
== ' ' || *s
== '\t')
4155 if (!strncasecmp("chap", p
, strlen(p
)))
4157 else if (!strncasecmp("pap", p
, strlen(p
)))
4160 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4162 config
->radius_authtypes
|= type
;
4163 if (!config
->radius_authprefer
)
4164 config
->radius_authprefer
= type
;
4169 if (!config
->radius_authtypes
)
4171 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4172 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4175 // normalise radius_authtypes_s
4176 if (config
->radius_authprefer
== AUTHPAP
)
4178 strcpy(config
->radius_authtypes_s
, "pap");
4179 if (config
->radius_authtypes
& AUTHCHAP
)
4180 strcat(config
->radius_authtypes_s
, ", chap");
4184 strcpy(config
->radius_authtypes_s
, "chap");
4185 if (config
->radius_authtypes
& AUTHPAP
)
4186 strcat(config
->radius_authtypes_s
, ", pap");
4189 // re-initialise the random number source
4190 initrandom(config
->random_device
);
4193 for (i
= 0; i
< MAXPLUGINS
; i
++)
4195 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4198 if (*config
->plugins
[i
])
4201 add_plugin(config
->plugins
[i
]);
4203 else if (*config
->old_plugins
[i
])
4206 remove_plugin(config
->old_plugins
[i
]);
4210 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4211 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4212 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4213 if (!*config
->cluster_interface
)
4214 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4216 if (!config
->cluster_hb_interval
)
4217 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4219 if (!config
->cluster_hb_timeout
)
4220 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4222 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4224 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4225 // late, ensure we're sufficiently larger than that
4226 int t
= 4 * config
->cluster_hb_interval
+ 11;
4228 if (config
->cluster_hb_timeout
< t
)
4230 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4231 config
->cluster_hb_timeout
= t
;
4234 // Push timing changes to the slaves immediately if we're the master
4235 if (config
->cluster_iam_master
)
4236 cluster_heartbeat();
4238 interval
= config
->cluster_hb_interval
;
4239 timeout
= config
->cluster_hb_timeout
;
4243 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4246 if ((f
= fopen(config
->pid_file
, "w")))
4248 fprintf(f
, "%d\n", getpid());
4250 config
->wrote_pid
= 1;
4254 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4258 config
->reload_config
= 0;
4261 static void read_config_file()
4265 if (!config
->config_file
) return;
4266 if (!(f
= fopen(config
->config_file
, "r")))
4268 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4272 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4274 LOG(3, 0, 0, "Done reading config file\n");
4279 int sessionsetup(tunnelidt t
, sessionidt s
)
4281 // A session now exists, set it up
4287 CSTAT(sessionsetup
);
4289 LOG(3, s
, t
, "Doing session setup for session\n");
4293 assign_ip_address(s
);
4296 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4297 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4300 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4301 fmtaddr(htonl(session
[s
].ip
), 0));
4305 // Make sure this is right
4306 session
[s
].tunnel
= t
;
4308 // zap old sessions with same IP and/or username
4309 // Don't kill gardened sessions - doing so leads to a DoS
4310 // from someone who doesn't need to know the password
4313 user
= session
[s
].user
;
4314 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4316 if (i
== s
) continue;
4317 if (!session
[s
].opened
) continue;
4318 if (ip
== session
[i
].ip
)
4320 sessionkill(i
, "Duplicate IP address");
4324 if (config
->allow_duplicate_users
) continue;
4325 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4326 if (!strcasecmp(user
, session
[i
].user
))
4327 sessionkill(i
, "Duplicate session for users");
4334 // Add the route for this session.
4335 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4337 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4338 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4341 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4344 // Static IPs need to be routed if not already
4345 // convered by a Framed-Route. Anything else is part
4346 // of the IP address pool and is already routed, it
4347 // just needs to be added to the IP cache.
4348 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4349 if (session
[s
].ip_pool_index
== -1) // static ip
4351 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4354 cache_ipmap(session
[s
].ip
, s
);
4357 if (!session
[s
].unique_id
)
4359 // did this session just finish radius?
4360 LOG(3, s
, t
, "Sending initial IPCP to client\n");
4362 session
[s
].unique_id
= ++last_id
;
4365 // Run the plugin's against this new session.
4367 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4368 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4371 // Allocate TBFs if throttled
4372 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4373 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4375 session
[s
].last_packet
= time_now
;
4377 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4378 fmtaddr(htonl(session
[s
].ip
), 0),
4379 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4381 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4383 return 1; // RADIUS OK and IP allocated, done...
4387 // This session just got dropped on us by the master or something.
4388 // Make sure our tables up up to date...
4390 int load_session(sessionidt s
, sessiont
*new)
4396 if (new->ip_pool_index
>= MAXIPPOOL
||
4397 new->tunnel
>= MAXTUNNEL
)
4399 LOG(0, s
, 0, "Strange session update received!\n");
4400 // FIXME! What to do here?
4405 // Ok. All sanity checks passed. Now we're committed to
4406 // loading the new session.
4409 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4411 // See if routes/ip cache need updating
4412 if (new->ip
!= session
[s
].ip
)
4415 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4416 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4417 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4425 // remove old routes...
4426 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4428 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4429 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4432 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4438 if (session
[s
].ip_pool_index
== -1) // static IP
4440 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4442 else // It's part of the IP pool, remove it manually.
4443 uncache_ipmap(session
[s
].ip
);
4448 // add new routes...
4449 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4451 if ((new->ip
& new->route
[i
].mask
) ==
4452 (new->route
[i
].ip
& new->route
[i
].mask
))
4455 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4461 // If there's a new one, add it.
4462 if (new->ip_pool_index
== -1)
4464 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4467 cache_ipmap(new->ip
, s
);
4472 if (new->flags
& SF_IPV6_ROUTED
&& !(session
[s
].flags
& SF_IPV6_ROUTED
))
4473 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4476 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4478 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4482 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4484 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4485 new->filter_out
= 0;
4488 if (new->filter_in
!= session
[s
].filter_in
)
4490 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4491 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4494 if (new->filter_out
!= session
[s
].filter_out
)
4496 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4497 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4500 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4501 // for walking the sessions to forward byte counts to the master.
4502 config
->cluster_highest_sessionid
= s
;
4504 // TEMP: old session struct used a uint32_t to define the throttle
4505 // speed for both up/down, new uses a uint16_t for each. Deal with
4506 // sessions from an old master for migration.
4507 if (new->throttle_out
== 0 && new->tbf_out
)
4508 new->throttle_out
= new->throttle_in
;
4510 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4512 // Do fixups into address pool.
4513 if (new->ip_pool_index
!= -1)
4514 fix_address_pool(s
);
4519 static void initplugins()
4523 loaded_plugins
= ll_init();
4524 // Initialize the plugins to nothing
4525 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4526 plugins
[i
] = ll_init();
4529 static void *open_plugin(char *plugin_name
, int load
)
4531 char path
[256] = "";
4533 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4534 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4535 return dlopen(path
, RTLD_NOW
);
4538 // plugin callback to get a config value
4539 static void *getconfig(char *key
, enum config_typet type
)
4543 for (i
= 0; config_values
[i
].key
; i
++)
4545 if (!strcmp(config_values
[i
].key
, key
))
4547 if (config_values
[i
].type
== type
)
4548 return ((void *) config
) + config_values
[i
].offset
;
4550 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4551 key
, type
, config_values
[i
].type
);
4557 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4561 static int add_plugin(char *plugin_name
)
4563 static struct pluginfuncs funcs
= {
4568 sessiontbysessionidt
,
4569 sessionidtbysessiont
,
4576 cluster_send_session
,
4579 void *p
= open_plugin(plugin_name
, 1);
4580 int (*initfunc
)(struct pluginfuncs
*);
4585 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4589 if (ll_contains(loaded_plugins
, p
))
4592 return 0; // already loaded
4596 int *v
= dlsym(p
, "plugin_api_version");
4597 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4599 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4605 if ((initfunc
= dlsym(p
, "plugin_init")))
4607 if (!initfunc(&funcs
))
4609 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4615 ll_push(loaded_plugins
, p
);
4617 for (i
= 0; i
< max_plugin_functions
; i
++)
4620 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4622 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4623 ll_push(plugins
[i
], x
);
4627 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4631 static void run_plugin_done(void *plugin
)
4633 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4639 static int remove_plugin(char *plugin_name
)
4641 void *p
= open_plugin(plugin_name
, 0);
4647 if (ll_contains(loaded_plugins
, p
))
4650 for (i
= 0; i
< max_plugin_functions
; i
++)
4653 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4654 ll_delete(plugins
[i
], x
);
4657 ll_delete(loaded_plugins
, p
);
4663 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4667 int run_plugins(int plugin_type
, void *data
)
4669 int (*func
)(void *data
);
4671 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4672 return PLUGIN_RET_ERROR
;
4674 ll_reset(plugins
[plugin_type
]);
4675 while ((func
= ll_next(plugins
[plugin_type
])))
4679 if (r
!= PLUGIN_RET_OK
)
4680 return r
; // stop here
4683 return PLUGIN_RET_OK
;
4686 static void plugins_done()
4690 ll_reset(loaded_plugins
);
4691 while ((p
= ll_next(loaded_plugins
)))
4695 static void processcontrol(uint8_t * buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4697 struct nsctl request
;
4698 struct nsctl response
;
4699 int type
= unpack_control(&request
, buf
, len
);
4703 if (log_stream
&& config
->debug
>= 4)
4707 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4708 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4712 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4713 dump_control(&request
, log_stream
);
4719 case NSCTL_REQ_LOAD
:
4720 if (request
.argc
!= 1)
4722 response
.type
= NSCTL_RES_ERR
;
4724 response
.argv
[0] = "name of plugin required";
4726 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4728 response
.type
= NSCTL_RES_ERR
;
4730 response
.argv
[0] = !r
4731 ? "plugin already loaded"
4732 : "error loading plugin";
4736 response
.type
= NSCTL_RES_OK
;
4742 case NSCTL_REQ_UNLOAD
:
4743 if (request
.argc
!= 1)
4745 response
.type
= NSCTL_RES_ERR
;
4747 response
.argv
[0] = "name of plugin required";
4749 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4751 response
.type
= NSCTL_RES_ERR
;
4753 response
.argv
[0] = !r
4754 ? "plugin not loaded"
4755 : "plugin not found";
4759 response
.type
= NSCTL_RES_OK
;
4765 case NSCTL_REQ_HELP
:
4766 response
.type
= NSCTL_RES_OK
;
4769 ll_reset(loaded_plugins
);
4770 while ((p
= ll_next(loaded_plugins
)))
4772 char **help
= dlsym(p
, "plugin_control_help");
4773 while (response
.argc
< 0xff && help
&& *help
)
4774 response
.argv
[response
.argc
++] = *help
++;
4779 case NSCTL_REQ_CONTROL
:
4781 struct param_control param
= {
4782 config
->cluster_iam_master
,
4789 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4791 if (r
== PLUGIN_RET_ERROR
)
4793 response
.type
= NSCTL_RES_ERR
;
4795 response
.argv
[0] = param
.additional
4797 : "error returned by plugin";
4799 else if (r
== PLUGIN_RET_NOTMASTER
)
4801 static char msg
[] = "must be run on master: 000.000.000.000";
4803 response
.type
= NSCTL_RES_ERR
;
4805 if (config
->cluster_master_address
)
4807 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4808 response
.argv
[0] = msg
;
4812 response
.argv
[0] = "must be run on master: none elected";
4815 else if (!(param
.response
& NSCTL_RESPONSE
))
4817 response
.type
= NSCTL_RES_ERR
;
4819 response
.argv
[0] = param
.response
4820 ? "unrecognised response value from plugin"
4821 : "unhandled action";
4825 response
.type
= param
.response
;
4827 if (param
.additional
)
4830 response
.argv
[0] = param
.additional
;
4838 response
.type
= NSCTL_RES_ERR
;
4840 response
.argv
[0] = "error unpacking control packet";
4843 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4846 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4850 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4853 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4854 if (log_stream
&& config
->debug
>= 4)
4856 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4857 dump_control(&response
, log_stream
);
4861 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4862 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4867 static tunnelidt
new_tunnel()
4870 for (i
= 1; i
< MAXTUNNEL
; i
++)
4872 if (tunnel
[i
].state
== TUNNELFREE
)
4874 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4875 if (i
> config
->cluster_highest_tunnelid
)
4876 config
->cluster_highest_tunnelid
= i
;
4880 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4885 // We're becoming the master. Do any required setup..
4887 // This is principally telling all the plugins that we're
4888 // now a master, and telling them about all the sessions
4889 // that are active too..
4891 void become_master(void)
4894 static struct event_data d
[RADIUS_FDS
];
4895 struct epoll_event e
;
4897 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4899 // running a bunch of iptables commands is slow and can cause
4900 // the master to drop tunnels on takeover--kludge around the
4901 // problem by forking for the moment (note: race)
4902 if (!fork_and_close())
4904 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4906 if (!session
[s
].opened
) // Not an in-use session.
4909 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4916 for (i
= 0; i
< RADIUS_FDS
; i
++)
4918 d
[i
].type
= FD_TYPE_RADIUS
;
4922 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
4926 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4932 if (CLI_HELP_REQUESTED
)
4933 return CLI_HELP_NO_ARGS
;
4936 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4938 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4941 if (!session
[s
].opened
)
4944 idle
= time_now
- session
[s
].last_packet
;
4945 idle
/= 5 ; // In multiples of 5 seconds.
4955 for (i
= 0; i
< 63; ++i
)
4957 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4959 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4960 cli_print(cli
, "%d total sessions open.", count
);
4964 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4970 if (CLI_HELP_REQUESTED
)
4971 return CLI_HELP_NO_ARGS
;
4974 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4976 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4979 if (!session
[s
].opened
)
4982 d
= time_now
- session
[s
].opened
;
4985 while (d
> 1 && open
< 32)
4995 for (i
= 0; i
< 30; ++i
)
4997 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5000 cli_print(cli
, "%d total sessions open.", count
);
5006 * This unencodes the AVP using the L2TP secret and the previously
5007 * stored random vector. It overwrites the hidden data with the
5008 * unhidden AVP subformat.
5010 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5016 uint16_t m
= htons(type
);
5018 // Compute initial pad
5020 MD5Update(&ctx
, (unsigned char *) &m
, 2);
5021 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5022 MD5Update(&ctx
, vector
, vec_len
);
5023 MD5Final(digest
, &ctx
);
5025 // pointer to last decoded 16 octets
5030 // calculate a new pad based on the last decoded block
5031 if (d
>= sizeof(digest
))
5034 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5035 MD5Update(&ctx
, last
, sizeof(digest
));
5036 MD5Final(digest
, &ctx
);
5042 *value
++ ^= digest
[d
++];
5047 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5051 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5052 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5053 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5054 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5055 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5061 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5065 case FILTER_FLAG_OP_ANY
:
5066 return (flags
& sflags
) || (~flags
& cflags
);
5068 case FILTER_FLAG_OP_ALL
:
5069 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5071 case FILTER_FLAG_OP_EST
:
5072 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5078 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5080 uint16_t frag_offset
;
5084 uint16_t src_port
= 0;
5085 uint16_t dst_port
= 0;
5087 ip_filter_rulet
*rule
;
5089 if (len
< 20) // up to end of destination address
5092 if ((*buf
>> 4) != 4) // IPv4
5095 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5097 src_ip
= *(in_addr_t
*) (buf
+ 12);
5098 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5100 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5102 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5103 if (len
< l
+ 4) // ports
5106 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5107 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5108 if (proto
== IPPROTO_TCP
)
5110 if (len
< l
+ 14) // flags
5113 flags
= buf
[l
+ 13] & 0x3f;
5117 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5119 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5122 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5123 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5126 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5127 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5132 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5140 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5142 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5145 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5148 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5149 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5156 return rule
->action
== FILTER_ACTION_PERMIT
;