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 1.81 2005/02/08 01:20:38 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 static int rand_fd
= -1; // Random data source
68 time_t basetime
= 0; // base clock
69 char hostname
[1000] = ""; // us.
70 static int tunidx
; // ifr_ifindex of tun device
71 static uint32_t sessionid
= 0; // session id for radius accounting
72 static int syslog_log
= 0; // are we logging to syslog
73 static FILE *log_stream
= NULL
; // file handle for direct logging (i.e. direct into file, not via syslog).
74 extern int cluster_sockfd
; // Intra-cluster communications socket.
75 uint32_t last_id
= 0; // Last used PPP SID. Can I kill this?? -- mo
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 static 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("save_state", save_state
, BOOL
),
110 CONFIG("primary_radius", radiusserver
[0], IPv4
),
111 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
112 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
113 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
114 CONFIG("radius_accounting", radius_accounting
, BOOL
),
115 CONFIG("radius_secret", radiussecret
, STRING
),
116 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
117 CONFIG("bind_address", bind_address
, IPv4
),
118 CONFIG("peer_address", peer_address
, IPv4
),
119 CONFIG("send_garp", send_garp
, BOOL
),
120 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
121 CONFIG("throttle_buckets", num_tbfs
, INT
),
122 CONFIG("accounting_dir", accounting_dir
, STRING
),
123 CONFIG("setuid", target_uid
, INT
),
124 CONFIG("dump_speed", dump_speed
, BOOL
),
125 CONFIG("cleanup_interval", cleanup_interval
, INT
),
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("ipv6_prefix", ipv6_prefix
, IPv6
),
139 static char *plugin_functions
[] = {
146 "plugin_new_session",
147 "plugin_kill_session",
149 "plugin_radius_response",
150 "plugin_become_master",
151 "plugin_new_session_master",
154 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
156 // Counters for shutdown sessions
157 static sessiont shut_acct
[8192];
158 static sessionidt shut_acct_n
= 0;
160 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
161 sessiont
*session
= NULL
; // Array of session structures.
162 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
163 radiust
*radius
= NULL
; // Array of radius structures.
164 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
165 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
166 static controlt
*controlfree
= 0;
167 struct Tstats
*_statistics
= NULL
;
169 struct Tringbuffer
*ringbuffer
= NULL
;
172 static void cache_ipmap(in_addr_t ip
, int s
);
173 static void uncache_ipmap(in_addr_t ip
);
174 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
175 static void free_ip_address(sessionidt s
);
176 static void dump_acct_info(int all
);
177 static void sighup_handler(int sig
);
178 static void sigalrm_handler(int sig
);
179 static void sigterm_handler(int sig
);
180 static void sigquit_handler(int sig
);
181 static void sigchild_handler(int sig
);
182 static void read_state(void);
183 static void dump_state(void);
184 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
);
185 static void update_config(void);
186 static void read_config_file(void);
187 static void initplugins(void);
188 static int add_plugin(char *plugin_name
);
189 static int remove_plugin(char *plugin_name
);
190 static void plugins_done(void);
191 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
192 static tunnelidt
new_tunnel(void);
193 static int unhide_avp(uint8_t *avp
, tunnelidt t
, sessionidt s
, uint16_t length
);
195 // return internal time (10ths since process startup)
196 static clockt
now(void)
200 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
203 // work out a retry time based on try number
204 // This is a straight bounded exponential backoff.
205 // Maximum re-try time is 32 seconds. (2^5).
206 clockt
backoff(uint8_t try)
208 if (try > 5) try = 5; // max backoff
209 return now() + 10 * (1 << try);
214 // Log a debug message. Typically called via the LOG macro
216 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
218 static char message
[65536] = {0};
224 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
225 ringbuffer
->tail
= 0;
226 if (ringbuffer
->tail
== ringbuffer
->head
)
227 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
228 ringbuffer
->head
= 0;
230 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
231 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
232 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
233 va_start(ap
, format
);
234 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
239 if (config
->debug
< level
) return;
241 va_start(ap
, format
);
242 vsnprintf(message
, sizeof(message
), format
, ap
);
245 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
247 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
252 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
255 const uint8_t *d
= (const uint8_t *) data
;
257 if (config
->debug
< level
) return;
259 // No support for _log_hex to syslog
262 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
263 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
265 for (i
= 0; i
< maxsize
; )
267 fprintf(log_stream
, "%4X: ", i
);
268 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
270 fprintf(log_stream
, "%02X ", d
[j
]);
272 fputs(": ", log_stream
);
275 for (; j
< i
+ 16; j
++)
277 fputs(" ", log_stream
);
279 fputs(": ", log_stream
);
282 fputs(" ", log_stream
);
283 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
285 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
286 fputc(d
[j
], log_stream
);
288 fputc('.', log_stream
);
291 fputs(" ", log_stream
);
295 fputs("\n", log_stream
);
299 setbuf(log_stream
, NULL
);
303 // initialise the random generator
304 static void initrandom(char *source
)
306 static char path
[sizeof(config
->random_device
)] = "*undefined*";
308 // reinitialise only if we are forced to do so or if the config has changed
309 if (source
&& !strncmp(path
, source
, sizeof(path
)))
312 // close previous source, if any
313 if (rand_fd
>= 0) close(rand_fd
);
320 snprintf(path
, sizeof(path
), "%s", source
);
324 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
326 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
327 path
, strerror(errno
));
331 // no source: seed prng
333 unsigned seed
= time_now
^ getpid();
334 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
339 // fill buffer with random data
340 void random_data(uint8_t *buf
, int len
)
347 n
= read(rand_fd
, buf
, len
);
348 if (n
>= len
) return;
353 LOG(0, 0, 0, "Error reading from random source: %s\n",
356 // fall back to rand()
364 // append missing data
366 // not using the low order bits from the prng stream
367 buf
[n
++] = (rand() >> 4) & 0xff;
372 // This adds it to the routing table, advertises it
373 // via BGP if enabled, and stuffs it into the
374 // 'sessionbyip' cache.
376 // 'ip' and 'mask' must be in _host_ order.
378 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
383 if (!mask
) mask
= 0xffffffff;
385 ip
&= mask
; // Force the ip to be the first one in the route.
387 memset(&r
, 0, sizeof(r
));
388 r
.rt_dev
= config
->tundevice
;
389 r
.rt_dst
.sa_family
= AF_INET
;
390 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
391 r
.rt_gateway
.sa_family
= AF_INET
;
392 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
393 r
.rt_genmask
.sa_family
= AF_INET
;
394 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
395 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
397 r
.rt_flags
|= RTF_GATEWAY
;
398 else if (mask
== 0xffffffff)
399 r
.rt_flags
|= RTF_HOST
;
401 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
402 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
403 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
405 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
406 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
410 bgp_add_route(htonl(ip
), htonl(mask
));
412 bgp_del_route(htonl(ip
), htonl(mask
));
415 // Add/Remove the IPs to the 'sessionbyip' cache.
416 // Note that we add the zero address in the case of
417 // a network route. Roll on CIDR.
419 // Note that 's == 0' implies this is the address pool.
420 // We still cache it here, because it will pre-fill
421 // the malloc'ed tree.
425 if (!add
) // Are we deleting a route?
426 s
= 0; // Caching the session as '0' is the same as uncaching.
428 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
433 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
436 char ipv6addr
[INET6_ADDRSTRLEN
];
440 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
444 memset(&rt
, 0, sizeof(rt
));
446 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
447 rt
.rtmsg_dst_len
= prefixlen
;
449 rt
.rtmsg_flags
= RTF_UP
;
450 rt
.rtmsg_ifindex
= tunidx
;
452 LOG(1, 0, 0, "Route %s %s/%d\n",
454 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
457 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
458 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
461 // FIXME: need to add BGP routing (RFC2858)
465 if (!add
) // Are we deleting a route?
466 s
= 0; // Caching the session as '0' is the same as uncaching.
468 cache_ipv6map(ip
, prefixlen
, s
);
474 // defined in linux/ipv6.h, but tricky to include from user-space
475 // TODO: move routing to use netlink rather than ioctl
477 struct in6_addr ifr6_addr
;
478 __u32 ifr6_prefixlen
;
479 unsigned int ifr6_ifindex
;
483 // Set up TUN interface
484 static void inittun(void)
487 struct in6_ifreq ifr6
;
488 struct sockaddr_in sin
= {0};
489 memset(&ifr
, 0, sizeof(ifr
));
490 ifr
.ifr_flags
= IFF_TUN
;
492 tunfd
= open(TUNDEVICE
, O_RDWR
);
495 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
499 int flags
= fcntl(tunfd
, F_GETFL
, 0);
500 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
502 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
504 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
507 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
508 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
509 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
511 sin
.sin_family
= AF_INET
;
512 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
513 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
515 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
517 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
520 /* Bump up the qlen to deal with bursts from the network */
522 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
524 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
527 ifr
.ifr_flags
= IFF_UP
;
528 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
530 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
533 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
535 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
538 tunidx
= ifr
.ifr_ifindex
;
540 // Only setup IPv6 on the tun device if we have a configured prefix
541 if (config
->ipv6_prefix
.s6_addr
[0] > 0) {
542 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
544 // Link local address is FE80::1
545 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
546 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
547 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
548 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
549 ifr6
.ifr6_prefixlen
= 64;
550 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
551 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
553 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
554 " %s\n", strerror(errno
));
557 // Global address is prefix::1
558 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
559 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
560 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
561 ifr6
.ifr6_prefixlen
= 64;
562 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
563 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
565 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
572 static void initudp(void)
575 struct sockaddr_in addr
;
578 memset(&addr
, 0, sizeof(addr
));
579 addr
.sin_family
= AF_INET
;
580 addr
.sin_port
= htons(L2TPPORT
);
581 addr
.sin_addr
.s_addr
= config
->bind_address
;
582 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
583 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
585 int flags
= fcntl(udpfd
, F_GETFL
, 0);
586 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
588 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
590 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
593 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
596 memset(&addr
, 0, sizeof(addr
));
597 addr
.sin_family
= AF_INET
;
598 addr
.sin_port
= htons(NSCTL_PORT
);
599 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
600 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
601 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
603 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
609 // Find session by IP, < 1 for not found
611 // Confusingly enough, this 'ip' must be
612 // in _network_ order. This being the common
613 // case when looking it up from IP packet headers.
615 // We actually use this cache for two things.
616 // #1. For used IP addresses, this maps to the
617 // session ID that it's used by.
618 // #2. For un-used IP addresses, this maps to the
619 // index into the pool table that contains that
623 static int lookup_ipmap(in_addr_t ip
)
625 uint8_t *a
= (uint8_t *) &ip
;
626 uint8_t **d
= (uint8_t **) ip_hash
;
628 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
629 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
630 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
632 return (int) (intptr_t) d
[(size_t) *a
];
635 static int lookup_ipv6map(struct in6_addr ip
)
637 struct ipv6radix
*curnode
;
640 char ipv6addr
[INET6_ADDRSTRLEN
];
642 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
646 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
648 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
653 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
654 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
661 sessionidt
sessionbyip(in_addr_t ip
)
663 int s
= lookup_ipmap(ip
);
666 if (s
> 0 && s
< MAXSESSION
&& session
[s
].tunnel
)
667 return (sessionidt
) s
;
672 sessionidt
sessionbyipv6(struct in6_addr ip
)
675 CSTAT(sessionbyipv6
);
677 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
678 (ip
.s6_addr
[0] == 0xFE && ip
.s6_addr
[1] == 0x80 &&
679 (ip
.s6_addr16
[1] == ip
.s6_addr16
[2] == ip
.s6_addr16
[3] == 0))) {
680 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
682 s
= lookup_ipv6map(ip
);
685 if (s
> 0 && s
< MAXSESSION
&& session
[s
].tunnel
)
692 // Take an IP address in HOST byte order and
693 // add it to the sessionid by IP cache.
695 // (It's actually cached in network order)
697 static void cache_ipmap(in_addr_t ip
, int s
)
699 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
700 uint8_t *a
= (uint8_t *) &nip
;
701 uint8_t **d
= (uint8_t **) ip_hash
;
704 for (i
= 0; i
< 3; i
++)
706 if (!d
[(size_t) a
[i
]])
708 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
712 d
= (uint8_t **) d
[(size_t) a
[i
]];
715 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
718 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
721 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
722 // else a map to an ip pool index.
725 static void uncache_ipmap(in_addr_t ip
)
727 cache_ipmap(ip
, 0); // Assign it to the NULL session.
730 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
734 struct ipv6radix
*curnode
;
735 char ipv6addr
[INET6_ADDRSTRLEN
];
737 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
739 bytes
= prefixlen
>> 3;
742 if (curnode
->branch
== NULL
)
744 if (!(curnode
->branch
= calloc(256,
745 sizeof (struct ipv6radix
))))
748 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
755 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
756 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
760 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
761 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
767 // CLI list to dump current ipcache.
769 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
771 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
775 if (CLI_HELP_REQUESTED
)
776 return CLI_HELP_NO_ARGS
;
778 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
780 for (i
= 0; i
< 256; ++i
)
785 for (j
= 0; j
< 256; ++j
)
790 for (k
= 0; k
< 256; ++k
)
795 for (l
= 0; l
< 256; ++l
)
799 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
805 cli_print(cli
, "%d entries in cache", count
);
810 // Find session by username, 0 for not found
811 // walled garden users aren't authenticated, so the username is
812 // reasonably useless. Ignore them to avoid incorrect actions
814 // This is VERY inefficent. Don't call it often. :)
816 sessionidt
sessionbyuser(char *username
)
819 CSTAT(sessionbyuser
);
821 for (s
= 1; s
< MAXSESSION
; ++s
)
823 if (session
[s
].walled_garden
)
824 continue; // Skip walled garden users.
826 if (!strncmp(session
[s
].user
, username
, 128))
830 return 0; // Not found.
833 void send_garp(in_addr_t ip
)
839 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
842 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
845 memset(&ifr
, 0, sizeof(ifr
));
846 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
847 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
849 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
853 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
854 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
856 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
861 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
864 // Find session by username, 0 for not found
865 static sessiont
*sessiontbysessionidt(sessionidt s
)
867 if (!s
|| s
> MAXSESSION
) return NULL
;
871 static sessionidt
sessionidtbysessiont(sessiont
*s
)
873 sessionidt val
= s
-session
;
874 if (s
< session
|| val
> MAXSESSION
) return 0;
878 // actually send a control message for a specific tunnel
879 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
881 struct sockaddr_in addr
;
887 static int backtrace_count
= 0;
888 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
889 STAT(tunnel_tx_errors
);
890 log_backtrace(backtrace_count
, 5)
896 static int backtrace_count
= 0;
897 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
898 log_backtrace(backtrace_count
, 5)
899 STAT(tunnel_tx_errors
);
903 memset(&addr
, 0, sizeof(addr
));
904 addr
.sin_family
= AF_INET
;
905 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
906 addr
.sin_port
= htons(tunnel
[t
].port
);
908 // sequence expected, if sequence in message
909 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
911 // If this is a control message, deal with retries
914 tunnel
[t
].last
= time_now
; // control message sent
915 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
916 if (tunnel
[t
].try > 1)
918 STAT(tunnel_retries
);
919 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
923 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
925 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
926 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
927 STAT(tunnel_tx_errors
);
931 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
932 STAT(tunnel_tx_packets
);
933 INC_STAT(tunnel_tx_bytes
, l
);
937 // Tiny helper function to write data to
940 int tun_write(uint8_t * data
, int size
)
942 return write(tunfd
, data
, size
);
945 // process outgoing (to tunnel) IP
947 static void processipout(uint8_t * buf
, int len
)
954 char *data
= buf
; // Keep a copy of the originals.
957 uint8_t b
[MAXETHER
+ 20];
961 if (len
< MIN_IP_SIZE
)
963 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
969 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
974 // Skip the tun header
978 // Got an IP header now
979 if (*(uint8_t *)(buf
) >> 4 != 4)
981 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
985 ip
= *(uint32_t *)(buf
+ 16);
986 if (!(s
= sessionbyip(ip
)))
988 // Is this a packet for a session that doesn't exist?
989 static int rate
= 0; // Number of ICMP packets we've sent this second.
990 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
992 if (last
!= time_now
)
998 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1000 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1001 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4), ip
, buf
, (len
< 64) ? 64 : len
);
1005 t
= session
[s
].tunnel
;
1008 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1009 if (config
->max_packets
> 0)
1011 if (sess_local
[s
].last_packet_out
== TIME
)
1013 int max
= config
->max_packets
;
1015 // All packets for throttled sessions are handled by the
1016 // master, so further limit by using the throttle rate.
1017 // A bit of a kludge, since throttle rate is in kbps,
1018 // but should still be generous given our average DSL
1019 // packet size is 200 bytes: a limit of 28kbps equates
1020 // to around 180 packets per second.
1021 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1022 max
= sp
->throttle_out
;
1024 if (++sess_local
[s
].packets_out
> max
)
1026 sess_local
[s
].packets_dropped
++;
1032 if (sess_local
[s
].packets_dropped
)
1034 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1035 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1036 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1037 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1041 sess_local
[s
].last_packet_out
= TIME
;
1042 sess_local
[s
].packets_out
= 1;
1043 sess_local
[s
].packets_dropped
= 0;
1047 // run access-list if any
1048 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1053 // Are we throttling this session?
1054 if (config
->cluster_iam_master
)
1055 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1057 master_throttle_packet(sp
->tbf_out
, data
, size
);
1060 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1062 // We are walled-gardening this
1063 master_garden_packet(s
, data
, size
);
1067 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1069 // Add on L2TP header
1071 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1073 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1076 // Snooping this session, send it to intercept box
1077 if (sp
->snoop_ip
&& sp
->snoop_port
)
1078 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1080 sp
->cout
+= len
; // byte count
1081 sp
->total_cout
+= len
; // byte count
1084 sess_local
[s
].cout
+= len
; // To send to master..
1087 // process outgoing (to tunnel) IPv6
1089 static void processipv6out(uint8_t * buf
, int len
)
1095 struct in6_addr ip6
;
1097 char *data
= buf
; // Keep a copy of the originals.
1100 uint8_t b
[MAXETHER
+ 20];
1102 CSTAT(processipv6out
);
1104 if (len
< MIN_IP_SIZE
)
1106 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1107 STAT(tunnel_tx_errors
);
1110 if (len
>= MAXETHER
)
1112 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1113 STAT(tunnel_tx_errors
);
1117 // Skip the tun header
1121 // Got an IP header now
1122 if (*(uint8_t *)(buf
) >> 4 != 6)
1124 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1128 ip6
= *(struct in6_addr
*)(buf
+24);
1129 s
= sessionbyipv6(ip6
);
1133 ip
= *(uint32_t *)(buf
+ 32);
1134 s
= sessionbyip(ip
);
1139 // Is this a packet for a session that doesn't exist?
1140 static int rate
= 0; // Number of ICMP packets we've sent this second.
1141 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1143 if (last
!= time_now
)
1149 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1151 // FIXME: Should send icmp6 host unreachable
1155 t
= session
[s
].tunnel
;
1158 // FIXME: add DoS prevention/filters?
1162 // Are we throttling this session?
1163 if (config
->cluster_iam_master
)
1164 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1166 master_throttle_packet(sp
->tbf_out
, data
, size
);
1169 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1171 // We are walled-gardening this
1172 master_garden_packet(s
, data
, size
);
1176 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1178 // Add on L2TP header
1180 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIPV6
);
1182 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1185 // Snooping this session, send it to intercept box
1186 if (sp
->snoop_ip
&& sp
->snoop_port
)
1187 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1189 sp
->cout
+= len
; // byte count
1190 sp
->total_cout
+= len
; // byte count
1193 sess_local
[s
].cout
+= len
; // To send to master..
1197 // Helper routine for the TBF filters.
1198 // Used to send queued data in to the user!
1200 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1206 uint8_t b
[MAXETHER
+ 20];
1208 if (len
< 0 || len
> MAXETHER
)
1210 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1214 // Skip the tun header
1218 ip
= *(in_addr_t
*)(buf
+ 16);
1223 t
= session
[s
].tunnel
;
1226 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1228 // Add on L2TP header
1230 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1232 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1235 // Snooping this session.
1236 if (sp
->snoop_ip
&& sp
->snoop_port
)
1237 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1239 sp
->cout
+= len
; // byte count
1240 sp
->total_cout
+= len
; // byte count
1243 sess_local
[s
].cout
+= len
; // To send to master..
1246 // add an AVP (16 bit)
1247 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1249 uint16_t l
= (m
? 0x8008 : 0x0008);
1250 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1251 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1252 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1253 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1257 // add an AVP (32 bit)
1258 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1260 uint16_t l
= (m
? 0x800A : 0x000A);
1261 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1262 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1263 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1264 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1268 // add an AVP (32 bit)
1269 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1271 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1272 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1273 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1274 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1275 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1276 c
->length
+= 6 + strlen(val
);
1280 static void controlb(controlt
* c
, uint16_t avp
, char *val
, unsigned int len
, uint8_t m
)
1282 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1283 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1284 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1285 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1286 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1287 c
->length
+= 6 + len
;
1290 // new control connection
1291 static controlt
*controlnew(uint16_t mtype
)
1295 c
= malloc(sizeof(controlt
));
1299 controlfree
= c
->next
;
1303 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1305 control16(c
, 0, mtype
, 1);
1309 // send zero block if nothing is waiting
1311 static void controlnull(tunnelidt t
)
1314 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1317 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1318 *(uint16_t *) (buf
+ 2) = htons(12); // length
1319 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1320 *(uint16_t *) (buf
+ 6) = htons(0); // session
1321 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1322 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1323 tunnelsend(buf
, 12, t
);
1326 // add a control message to a tunnel, and send if within window
1327 static void controladd(controlt
* c
, tunnelidt t
, sessionidt s
)
1329 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1330 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1331 *(uint16_t *) (c
->buf
+ 6) = htons(s
? session
[s
].far
: 0); // session
1332 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1333 tunnel
[t
].ns
++; // advance sequence
1334 // link in message in to queue
1335 if (tunnel
[t
].controlc
)
1336 tunnel
[t
].controle
->next
= c
;
1338 tunnel
[t
].controls
= c
;
1340 tunnel
[t
].controle
= c
;
1341 tunnel
[t
].controlc
++;
1343 // send now if space in window
1344 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1346 tunnel
[t
].try = 0; // first send
1347 tunnelsend(c
->buf
, c
->length
, t
);
1352 // Throttle or Unthrottle a session
1354 // Throttle the data from/to through a session to no more than
1355 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1358 // If either value is -1, the current value is retained for that
1361 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1363 if (!session
[s
].tunnel
)
1364 return; // No-one home.
1366 if (!*session
[s
].user
)
1367 return; // User not logged in
1371 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1372 if (session
[s
].tbf_in
)
1373 free_tbf(session
[s
].tbf_in
);
1376 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1378 session
[s
].tbf_in
= 0;
1380 session
[s
].throttle_in
= rate_in
;
1385 int bytes
= rate_out
* 1024 / 8;
1386 if (session
[s
].tbf_out
)
1387 free_tbf(session
[s
].tbf_out
);
1390 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1392 session
[s
].tbf_out
= 0;
1394 session
[s
].throttle_out
= rate_out
;
1398 // add/remove filters from session (-1 = no change)
1399 static void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1401 if (!session
[s
].tunnel
)
1402 return; // No-one home.
1404 if (!*session
[s
].user
)
1405 return; // User not logged in
1408 if (filter_in
> MAXFILTER
) filter_in
= -1;
1409 if (filter_out
> MAXFILTER
) filter_out
= -1;
1410 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1411 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1415 if (session
[s
].filter_in
)
1416 ip_filters
[session
[s
].filter_in
- 1].used
--;
1419 ip_filters
[filter_in
- 1].used
++;
1421 session
[s
].filter_in
= filter_in
;
1424 if (filter_out
>= 0)
1426 if (session
[s
].filter_out
)
1427 ip_filters
[session
[s
].filter_out
- 1].used
--;
1430 ip_filters
[filter_out
- 1].used
++;
1432 session
[s
].filter_out
= filter_out
;
1436 // start tidy shutdown of session
1437 void sessionshutdown(sessionidt s
, char *reason
)
1439 int walled_garden
= session
[s
].walled_garden
;
1442 CSTAT(sessionshutdown
);
1444 if (!session
[s
].tunnel
)
1446 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on a session with no tunnel.\n");
1447 return; // not a live session
1450 if (!session
[s
].die
)
1452 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1453 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1454 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1457 if (session
[s
].opened
&& !walled_garden
&& !session
[s
].die
)
1459 // RADIUS Stop message
1460 uint16_t r
= session
[s
].radius
;
1463 if (!(r
= radiusnew(s
)))
1465 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1466 STAT(radius_overflow
);
1470 random_data(radius
[r
].auth
, sizeof(radius
[r
].auth
));
1474 if (r
&& radius
[r
].state
!= RADIUSSTOP
)
1475 radiussend(r
, RADIUSSTOP
); // stop, if not already trying
1477 // Save counters to dump to accounting file
1478 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1479 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1483 { // IP allocated, clear and unroute
1486 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1488 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1489 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1492 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1493 session
[s
].route
[r
].ip
= 0;
1496 if (session
[s
].ip_pool_index
== -1) // static ip
1498 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1504 // unroute IPv6, if setup
1505 if (session
[s
].flags
& SF_IPV6_ROUTED
)
1506 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1509 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1510 throttle_session(s
, 0, 0);
1513 controlt
*c
= controlnew(14); // sending CDN
1514 control16(c
, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message
1515 control16(c
, 14, s
, 1); // assigned session (our end)
1516 controladd(c
, session
[s
].tunnel
, s
); // send the message
1519 if (!session
[s
].die
)
1520 session
[s
].die
= now() + 150; // Clean up in 15 seconds
1522 // update filter refcounts
1523 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1524 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1526 cluster_send_session(s
);
1529 void sendipcp(tunnelidt t
, sessionidt s
)
1531 uint8_t buf
[MAXCONTROL
];
1532 uint16_t r
= session
[s
].radius
;
1540 if (radius
[r
].state
!= RADIUSIPCP
)
1542 radius
[r
].state
= RADIUSIPCP
;
1546 radius
[r
].retry
= backoff(radius
[r
].try++);
1547 if (radius
[r
].try > 10)
1549 radiusclear(r
, s
); // Clear radius session.
1550 sessionshutdown(s
, "No reply on IPCP");
1554 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1558 q
[1] = r
<< RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1559 *(uint16_t *) (q
+ 2) = htons(10);
1562 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1563 config
->bind_address
? config
->bind_address
:
1564 my_address
; // send my IP
1566 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1567 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1569 // If we have an IPv6 prefix length configured, assume we should
1570 // try to negotiate an IPv6 session as well. Unless we've had a
1571 // (N)ACK for IPV6CP.
1572 if (config
->ipv6_prefix
.s6_addr
[0] > 0 &&
1573 !(session
[s
].flags
& SF_IPV6CP_ACKED
) &&
1574 !(session
[s
].flags
& SF_IPV6_NACKED
))
1576 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1580 q
[1] = r
<< RADIUS_SHIFT
; // ID, don't care, we
1581 // only send one type
1583 *(uint16_t *) (q
+ 2) = htons(14);
1586 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1587 *(uint32_t *) (q
+ 10) = 0;
1590 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1594 // kill a session now
1595 static void sessionkill(sessionidt s
, char *reason
)
1600 session
[s
].die
= now();
1601 sessionshutdown(s
, reason
); // close radius/routes, etc.
1602 if (session
[s
].radius
)
1603 radiusclear(session
[s
].radius
, s
); // cant send clean accounting data, session is killed
1605 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1607 memset(&session
[s
], 0, sizeof(session
[s
]));
1608 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1609 session
[s
].next
= sessionfree
;
1611 cli_session_actions
[s
].action
= 0;
1612 cluster_send_session(s
);
1615 static void tunnelclear(tunnelidt t
)
1618 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1619 tunnel
[t
].state
= TUNNELFREE
;
1622 // kill a tunnel now
1623 static void tunnelkill(tunnelidt t
, char *reason
)
1630 tunnel
[t
].state
= TUNNELDIE
;
1632 // free control messages
1633 while ((c
= tunnel
[t
].controls
))
1635 controlt
* n
= c
->next
;
1636 tunnel
[t
].controls
= n
;
1637 tunnel
[t
].controlc
--;
1638 c
->next
= controlfree
;
1642 for (s
= 1; s
< MAXSESSION
; s
++)
1643 if (session
[s
].tunnel
== t
)
1644 sessionkill(s
, reason
);
1648 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1649 cli_tunnel_actions
[s
].action
= 0;
1650 cluster_send_tunnel(t
);
1653 // shut down a tunnel cleanly
1654 static void tunnelshutdown(tunnelidt t
, char *reason
)
1658 CSTAT(tunnelshutdown
);
1660 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1662 // never set up, can immediately kill
1663 tunnelkill(t
, reason
);
1666 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1669 for (s
= 1; s
< MAXSESSION
; s
++)
1670 if (session
[s
].tunnel
== t
)
1671 sessionshutdown(s
, reason
);
1673 tunnel
[t
].state
= TUNNELDIE
;
1674 tunnel
[t
].die
= now() + 700; // Clean up in 70 seconds
1675 cluster_send_tunnel(t
);
1676 // TBA - should we wait for sessions to stop?
1678 controlt
*c
= controlnew(4); // sending StopCCN
1679 control16(c
, 1, 1, 1); // result code (admin reasons - TBA make error, general error, add message)
1680 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1681 controladd(c
, t
, 0); // send the message
1685 // read and process packet on tunnel (UDP)
1686 void processudp(uint8_t * buf
, int len
, struct sockaddr_in
*addr
)
1688 char *chapresponse
= NULL
;
1689 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1690 uint8_t *p
= buf
+ 2;
1697 LOG_HEX(5, "UDP Data", buf
, len
);
1698 STAT(tunnel_rx_packets
);
1699 INC_STAT(tunnel_rx_bytes
, len
);
1702 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1703 STAT(tunnel_rx_errors
);
1706 if ((buf
[1] & 0x0F) != 2)
1708 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1709 STAT(tunnel_rx_errors
);
1714 l
= ntohs(*(uint16_t *) p
);
1717 t
= ntohs(*(uint16_t *) p
);
1719 s
= ntohs(*(uint16_t *) p
);
1721 if (s
>= MAXSESSION
)
1723 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1724 STAT(tunnel_rx_errors
);
1729 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1730 STAT(tunnel_rx_errors
);
1735 ns
= ntohs(*(uint16_t *) p
);
1737 nr
= ntohs(*(uint16_t *) p
);
1742 uint16_t o
= ntohs(*(uint16_t *) p
);
1747 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1748 STAT(tunnel_rx_errors
);
1754 uint16_t message
= 0xFFFF; // message type
1756 uint8_t mandatorymessage
= 0;
1757 uint8_t chap
= 0; // if CHAP being used
1758 uint16_t asession
= 0; // assigned session
1759 uint32_t amagic
= 0; // magic number
1760 uint8_t aflags
= 0; // flags from last LCF
1761 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1762 int requestchap
= 0; // do we request PAP instead of original CHAP request?
1763 char called
[MAXTEL
] = ""; // called number
1764 char calling
[MAXTEL
] = ""; // calling number
1766 if (!config
->cluster_iam_master
)
1768 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1772 if ((*buf
& 0xCA) != 0xC8)
1774 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1775 STAT(tunnel_rx_errors
);
1779 // check for duplicate tunnel open message
1785 // Is this a duplicate of the first packet? (SCCRQ)
1787 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1789 if (tunnel
[i
].state
!= TUNNELOPENING
||
1790 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1791 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1794 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1799 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1800 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1802 // if no tunnel specified, assign one
1805 if (!(t
= new_tunnel()))
1807 LOG(1, 0, 0, "No more tunnels\n");
1808 STAT(tunnel_overflow
);
1812 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1813 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1814 tunnel
[t
].window
= 4; // default window
1815 STAT(tunnel_created
);
1816 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1817 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1820 // If the 'ns' just received is not the 'nr' we're
1821 // expecting, just send an ack and drop it.
1823 // if 'ns' is less, then we got a retransmitted packet.
1824 // if 'ns' is greater than missed a packet. Either way
1825 // we should ignore it.
1826 if (ns
!= tunnel
[t
].nr
)
1828 // is this the sequence we were expecting?
1829 STAT(tunnel_rx_errors
);
1830 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1831 t
, ns
, tunnel
[t
].nr
);
1833 if (l
) // Is this not a ZLB?
1838 // This is used to time out old tunnels
1839 tunnel
[t
].lastrec
= time_now
;
1841 // check sequence of this message
1843 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1844 // some to clear maybe?
1845 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1847 controlt
*c
= tunnel
[t
].controls
;
1848 tunnel
[t
].controls
= c
->next
;
1849 tunnel
[t
].controlc
--;
1850 c
->next
= controlfree
;
1853 tunnel
[t
].try = 0; // we have progress
1856 // receiver advance (do here so quoted correctly in any sends below)
1857 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1858 if (skip
< 0) skip
= 0;
1859 if (skip
< tunnel
[t
].controlc
)
1861 // some control packets can now be sent that were previous stuck out of window
1862 int tosend
= tunnel
[t
].window
- skip
;
1863 controlt
*c
= tunnel
[t
].controls
;
1871 tunnel
[t
].try = 0; // first send
1872 tunnelsend(c
->buf
, c
->length
, t
);
1877 if (!tunnel
[t
].controlc
)
1878 tunnel
[t
].retry
= 0; // caught up
1881 { // if not a null message
1883 while (l
&& !(fatal
& 0x80))
1885 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1892 LOG(1, s
, t
, "Invalid length in AVP\n");
1893 STAT(tunnel_rx_errors
);
1900 // handle hidden AVPs
1901 if (!*config
->l2tpsecret
)
1903 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1907 if (!session
[s
].random_vector_length
)
1909 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
1913 LOG(4, s
, t
, "Hidden AVP\n");
1915 n
= unhide_avp(b
, t
, s
, n
);
1924 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1929 if (*(uint16_t *) (b
))
1931 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1936 mtype
= ntohs(*(uint16_t *) (b
));
1940 LOG(4, s
, t
, " AVP %d (%s) len %d\n", mtype
, avp_name(mtype
), n
);
1943 case 0: // message type
1944 message
= ntohs(*(uint16_t *) b
);
1945 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_message_type(message
));
1946 mandatorymessage
= flags
;
1948 case 1: // result code
1950 uint16_t rescode
= ntohs(*(uint16_t *) b
);
1951 const char* resdesc
= "(unknown)";
1954 resdesc
= stopccn_result_code(rescode
);
1956 else if (message
== 14)
1958 resdesc
= cdn_result_code(rescode
);
1961 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
1964 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
1965 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, error_code(errcode
));
1968 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
1973 case 2: // protocol version
1975 version
= ntohs(*(uint16_t *) (b
));
1976 LOG(4, s
, t
, " Protocol version = %d\n", version
);
1977 if (version
&& version
!= 0x0100)
1978 { // allow 0.0 and 1.0
1979 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
1985 case 3: // framing capabilities
1986 // LOG(4, s, t, "Framing capabilities\n");
1988 case 4: // bearer capabilities
1989 // LOG(4, s, t, "Bearer capabilities\n");
1991 case 5: // tie breaker
1992 // We never open tunnels, so we don't care about tie breakers
1993 // LOG(4, s, t, "Tie breaker\n");
1995 case 6: // firmware revision
1996 // LOG(4, s, t, "Firmware revision\n");
1998 case 7: // host name
1999 memset(tunnel
[t
].hostname
, 0, 128);
2000 memcpy(tunnel
[t
].hostname
, b
, (n
>= 127) ? 127 : n
);
2001 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2002 // TBA - to send to RADIUS
2004 case 8: // vendor name
2005 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2006 memcpy(tunnel
[t
].vendor
, b
, (n
>= sizeof(tunnel
[t
].vendor
) - 1) ? sizeof(tunnel
[t
].vendor
) - 1 : n
);
2007 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2009 case 9: // assigned tunnel
2010 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2011 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2013 case 10: // rx window
2014 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2015 if (!tunnel
[t
].window
)
2016 tunnel
[t
].window
= 1; // window of 0 is silly
2017 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2019 case 11: // Challenge
2021 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2022 build_chap_response(b
, 2, n
, &chapresponse
);
2025 case 13: // Response
2026 // Why did they send a response? We never challenge.
2027 LOG(2, s
, t
, " received unexpected challenge response\n");
2030 case 14: // assigned session
2031 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2032 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2034 case 15: // call serial number
2035 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2037 case 18: // bearer type
2038 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2041 case 19: // framing type
2042 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2045 case 21: // called number
2046 memset(called
, 0, MAXTEL
);
2047 memcpy(called
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
2048 LOG(4, s
, t
, " Called <%s>\n", called
);
2050 case 22: // calling number
2051 memset(calling
, 0, MAXTEL
);
2052 memcpy(calling
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
2053 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2057 case 24: // tx connect speed
2060 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2064 // AS5300s send connect speed as a string
2066 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
2067 session
[s
].tx_connect_speed
= atol(tmp
);
2069 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2071 case 38: // rx connect speed
2074 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2078 // AS5300s send connect speed as a string
2080 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
2081 session
[s
].rx_connect_speed
= atol(tmp
);
2083 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2085 case 25: // Physical Channel ID
2087 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2088 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2091 case 29: // Proxy Authentication Type
2093 uint16_t atype
= ntohs(*(uint16_t *)b
);
2094 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, auth_type(atype
));
2095 requestchap
= (atype
== 2);
2098 case 30: // Proxy Authentication Name
2100 char authname
[64] = {0};
2101 memcpy(authname
, b
, (n
> 63) ? 63 : n
);
2102 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2106 case 31: // Proxy Authentication Challenge
2108 memcpy(radius
[session
[s
].radius
].auth
, b
, 16);
2109 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2112 case 32: // Proxy Authentication ID
2114 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2115 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2116 if (session
[s
].radius
)
2117 radius
[session
[s
].radius
].id
= authid
;
2120 case 33: // Proxy Authentication Response
2122 char authresp
[64] = {0};
2123 memcpy(authresp
, b
, (n
> 63) ? 63 : n
);
2124 LOG(4, s
, t
, " Proxy Auth Response\n");
2127 case 27: // last send lcp
2128 { // find magic number
2129 uint8_t *p
= b
, *e
= p
+ n
;
2130 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2132 if (*p
== 5 && p
[1] == 6) // Magic-Number
2133 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2134 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol
2136 else if (*p
== 7) // Protocol-Field-Compression
2137 aflags
|= SESSIONPFC
;
2138 else if (*p
== 8) // Address-and-Control-Field-Compression
2139 aflags
|= SESSIONACFC
;
2144 case 28: // last recv lcp confreq
2146 case 26: // Initial Received LCP CONFREQ
2148 case 39: // seq required - we control it as an LNS anyway...
2150 case 36: // Random Vector
2151 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2152 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2153 memcpy(session
[s
].random_vector
, b
, n
);
2154 session
[s
].random_vector_length
= n
;
2157 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2164 tunnelshutdown(t
, "Unknown Mandatory AVP");
2168 case 1: // SCCRQ - Start Control Connection Request
2170 controlt
*c
= controlnew(2); // sending SCCRP
2171 control16(c
, 2, version
, 1); // protocol version
2172 control32(c
, 3, 3, 1); // framing
2173 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2174 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2175 control16(c
, 9, t
, 1); // assigned tunnel
2176 controladd(c
, t
, s
); // send the resply
2178 tunnel
[t
].state
= TUNNELOPENING
;
2181 tunnel
[t
].state
= TUNNELOPEN
;
2184 tunnel
[t
].state
= TUNNELOPEN
;
2185 controlnull(t
); // ack
2188 controlnull(t
); // ack
2189 tunnelshutdown(t
, "Stopped"); // Shut down cleanly
2190 tunnelkill(t
, "Stopped"); // Immediately force everything dead
2193 controlnull(t
); // simply ACK
2207 STAT(session_overflow
);
2208 tunnelshutdown(t
, "No free sessions");
2216 sessionfree
= session
[s
].next
;
2217 memset(&session
[s
], 0, sizeof(session
[s
]));
2219 if (s
> config
->cluster_highest_sessionid
)
2220 config
->cluster_highest_sessionid
= s
;
2222 // make a RADIUS session
2223 if (!(r
= radiusnew(s
)))
2225 LOG(1, s
, t
, "No free RADIUS sessions for ICRQ\n");
2226 sessionkill(s
, "no free RADIUS sesions");
2230 c
= controlnew(11); // sending ICRP
2231 session
[s
].id
= sessionid
++;
2232 session
[s
].opened
= time(NULL
);
2233 session
[s
].tunnel
= t
;
2234 session
[s
].far
= asession
;
2235 session
[s
].last_packet
= time_now
;
2236 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2237 control16(c
, 14, s
, 1); // assigned session
2238 controladd(c
, t
, s
); // send the reply
2240 // Generate a random challenge
2241 random_data(radius
[r
].auth
, sizeof(radius
[r
].auth
));
2242 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
2243 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2244 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2245 STAT(session_created
);
2252 if (amagic
== 0) amagic
= time_now
;
2253 session
[s
].magic
= amagic
; // set magic number
2254 session
[s
].l2tp_flags
= aflags
; // set flags received
2255 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2256 controlnull(t
); // ack
2257 // In CHAP state, request PAP instead
2262 controlnull(t
); // ack
2263 sessionshutdown(s
, "Closed (Received CDN)");
2266 LOG(1, s
, t
, "Missing message type\n");
2269 STAT(tunnel_rx_errors
);
2270 if (mandatorymessage
& 0x80)
2271 tunnelshutdown(t
, "Unknown message");
2273 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2276 if (chapresponse
) free(chapresponse
);
2277 cluster_send_tunnel(t
);
2281 LOG(4, s
, t
, " Got a ZLB ack\n");
2288 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2289 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2290 { // HDLC address header, discard
2296 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2297 STAT(tunnel_rx_errors
);
2307 prot
= ntohs(*(uint16_t *) p
);
2312 if (s
&& !session
[s
].tunnel
) // Is something wrong??
2314 if (!config
->cluster_iam_master
)
2316 // Pass it off to the master to deal with..
2317 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2322 LOG(1, s
, t
, "UDP packet contains session %d but no session[%d].tunnel "
2323 "exists (LAC said tunnel = %d). Dropping packet.\n", s
, s
, t
);
2325 STAT(tunnel_rx_errors
);
2331 session
[s
].last_packet
= time_now
;
2332 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2333 processpap(t
, s
, p
, l
);
2335 else if (prot
== PPPCHAP
)
2337 session
[s
].last_packet
= time_now
;
2338 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2339 processchap(t
, s
, p
, l
);
2341 else if (prot
== PPPLCP
)
2343 session
[s
].last_packet
= time_now
;
2344 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2345 processlcp(t
, s
, p
, l
);
2347 else if (prot
== PPPIPCP
)
2349 session
[s
].last_packet
= time_now
;
2350 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2351 processipcp(t
, s
, p
, l
);
2353 else if (prot
== PPPIPV6CP
)
2355 if (config
->ipv6_prefix
.s6_addr
[0] > 0)
2357 session
[s
].last_packet
= time_now
;
2358 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2359 processipv6cp(t
, s
, p
, l
);
2363 LOG(1, s
, t
, "IPv6 not configured; ignoring IPv6CP\n");
2366 else if (prot
== PPPCCP
)
2368 session
[s
].last_packet
= time_now
;
2369 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2370 processccp(t
, s
, p
, l
);
2372 else if (prot
== PPPIP
)
2376 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2377 return; // closing session, PPP not processed
2380 session
[s
].last_packet
= time_now
;
2381 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2383 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2387 processipin(t
, s
, p
, l
);
2389 else if (prot
== PPPIPV6
)
2391 if (!config
->ipv6_prefix
.s6_addr
[0] > 0)
2393 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2398 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2399 return; // closing session, PPP not processed
2402 session
[s
].last_packet
= time_now
;
2403 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2405 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2409 processipv6in(t
, s
, p
, l
);
2413 STAT(tunnel_rx_errors
);
2414 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2419 // read and process packet on tun
2420 static void processtun(uint8_t * buf
, int len
)
2422 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2423 STAT(tun_rx_packets
);
2424 INC_STAT(tun_rx_bytes
, len
);
2432 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2433 STAT(tun_rx_errors
);
2437 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2438 processipout(buf
, len
);
2439 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2440 && config
->ipv6_prefix
.s6_addr
[0] > 0)
2441 processipv6out(buf
, len
);
2447 // Maximum number of actions to complete.
2448 // This is to avoid sending out too many packets
2450 #define MAX_ACTIONS 500
2452 static int regular_cleanups(void)
2454 static sessionidt s
= 0; // Next session to check for actions on.
2458 static clockt next_acct
= 0;
2459 static clockt next_shut_acct
= 0;
2462 LOG(3, 0, 0, "Begin regular cleanup\n");
2464 for (r
= 1; r
< MAXRADIUS
; r
++)
2466 if (!radius
[r
].state
)
2468 if (radius
[r
].retry
)
2470 if (radius
[r
].retry
<= TIME
)
2473 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
2475 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
2477 // check for expired tunnels
2478 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2480 STAT(tunnel_timeout
);
2481 tunnelkill(t
, "Expired");
2484 // check for message resend
2485 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2487 // resend pending messages as timeout on reply
2488 if (tunnel
[t
].retry
<= TIME
)
2490 controlt
*c
= tunnel
[t
].controls
;
2491 uint8_t w
= tunnel
[t
].window
;
2492 tunnel
[t
].try++; // another try
2493 if (tunnel
[t
].try > 5)
2494 tunnelkill(t
, "Timeout on control message"); // game over
2498 tunnelsend(c
->buf
, c
->length
, t
);
2504 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2506 controlt
*c
= controlnew(6); // sending HELLO
2507 controladd(c
, t
, 0); // send the message
2508 LOG(3, 0, t
, "Sending HELLO message\n");
2511 // Check for tunnel changes requested from the CLI
2512 if ((a
= cli_tunnel_actions
[t
].action
))
2514 cli_tunnel_actions
[t
].action
= 0;
2515 if (a
& CLI_TUN_KILL
)
2517 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2518 tunnelshutdown(t
, "Requested by administrator");
2525 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2528 if (s
> config
->cluster_highest_sessionid
)
2531 if (!session
[s
].tunnel
) // Session isn't in use
2534 if (!session
[s
].die
&& session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2536 // IPCP has not completed yet. Resend
2537 LOG(3, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2538 sendipcp(session
[s
].tunnel
, s
);
2541 // check for expired sessions
2542 if (session
[s
].die
&& session
[s
].die
<= TIME
)
2544 sessionkill(s
, "Expired");
2545 if (++count
>= MAX_ACTIONS
) break;
2549 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2550 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2552 sessionshutdown(s
, "No response to LCP ECHO requests");
2553 STAT(session_timeout
);
2554 if (++count
>= MAX_ACTIONS
) break;
2558 // No data in IDLE_TIMEOUT seconds, send LCP ECHO
2559 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2561 uint8_t b
[MAXCONTROL
] = {0};
2563 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2567 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2568 *(uint16_t *)(q
+ 2) = htons(8); // Length
2569 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2571 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2572 (int)(time_now
- session
[s
].last_packet
));
2573 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2574 if (++count
>= MAX_ACTIONS
) break;
2577 // Check for actions requested from the CLI
2578 if ((a
= cli_session_actions
[s
].action
))
2582 cli_session_actions
[s
].action
= 0;
2583 if (a
& CLI_SESS_KILL
)
2585 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2586 sessionshutdown(s
, "Requested by administrator");
2587 a
= 0; // dead, no need to check for other actions
2590 if (a
& CLI_SESS_NOSNOOP
)
2592 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2593 session
[s
].snoop_ip
= 0;
2594 session
[s
].snoop_port
= 0;
2597 else if (a
& CLI_SESS_SNOOP
)
2599 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2600 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2601 cli_session_actions
[s
].snoop_port
);
2603 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2604 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2608 if (a
& CLI_SESS_NOTHROTTLE
)
2610 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2611 throttle_session(s
, 0, 0);
2614 else if (a
& CLI_SESS_THROTTLE
)
2616 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2617 cli_session_actions
[s
].throttle_in
,
2618 cli_session_actions
[s
].throttle_out
);
2620 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2624 if (a
& CLI_SESS_NOFILTER
)
2626 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2627 filter_session(s
, 0, 0);
2630 else if (a
& CLI_SESS_FILTER
)
2632 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2633 cli_session_actions
[s
].filter_in
,
2634 cli_session_actions
[s
].filter_out
);
2636 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2641 cluster_send_session(s
);
2643 if (++count
>= MAX_ACTIONS
) break;
2647 if (*config
->accounting_dir
)
2649 if (next_acct
<= TIME
)
2651 // Dump accounting data
2652 next_acct
= TIME
+ ACCT_TIME
;
2653 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2656 else if (next_shut_acct
<= TIME
)
2658 // Dump accounting data for shutdown sessions
2659 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2665 if (count
>= MAX_ACTIONS
)
2666 return 1; // Didn't finish!
2668 LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2674 // Are we in the middle of a tunnel update, or radius
2677 static int still_busy(void)
2680 static clockt last_talked
= 0;
2681 static clockt start_busy_wait
= 0;
2682 if (start_busy_wait
== 0)
2683 start_busy_wait
= TIME
;
2685 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2687 if (!tunnel
[i
].controlc
)
2690 if (last_talked
!= TIME
)
2692 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
2698 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2699 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2701 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2705 for (i
= 1; i
< MAXRADIUS
; i
++)
2707 if (radius
[i
].state
== RADIUSNULL
)
2709 if (radius
[i
].state
== RADIUSWAIT
)
2712 if (last_talked
!= TIME
)
2714 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2723 static fd_set readset
;
2724 static int readset_n
= 0;
2726 // main loop - gets packets on tun or udp and processes them
2727 static void mainloop(void)
2732 clockt next_cluster_ping
= 0; // send initial ping immediately
2733 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2735 LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2736 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2739 FD_SET(udpfd
, &readset
);
2740 FD_SET(tunfd
, &readset
);
2741 FD_SET(controlfd
, &readset
);
2742 FD_SET(clifd
, &readset
);
2743 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2745 if (tunfd
> readset_n
) readset_n
= tunfd
;
2746 if (controlfd
> readset_n
) readset_n
= controlfd
;
2747 if (clifd
> readset_n
) readset_n
= clifd
;
2748 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2750 while (!main_quit
|| still_busy())
2756 int bgp_set
[BGP_NUM_PEERS
];
2759 if (config
->reload_config
)
2761 // Update the config state based on config settings
2765 memcpy(&r
, &readset
, sizeof(fd_set
));
2767 to
.tv_usec
= 100000; // 1/10th of a second.
2771 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2773 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2776 FD_SET(bgp_peers
[i
].sock
, &r
);
2777 if (bgp_peers
[i
].sock
> n
)
2778 n
= bgp_peers
[i
].sock
;
2783 FD_SET(bgp_peers
[i
].sock
, &w
);
2784 if (bgp_peers
[i
].sock
> n
)
2785 n
= bgp_peers
[i
].sock
;
2789 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2791 n
= select(n
+ 1, &r
, 0, 0, &to
);
2794 STAT(select_called
);
2799 if (errno
== EINTR
||
2800 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2803 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2809 struct sockaddr_in addr
;
2813 int cluster_pkts
= 0;
2816 if (FD_ISSET(controlfd
, &r
))
2818 alen
= sizeof(addr
);
2819 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
2824 if (config
->cluster_iam_master
)
2826 for (i
= 0; i
< config
->num_radfds
; i
++)
2828 if (FD_ISSET(radfds
[i
], &r
))
2830 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2837 if (FD_ISSET(clifd
, &r
))
2841 alen
= sizeof(addr
);
2842 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
2848 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
2854 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2856 int isr
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0;
2857 int isw
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0;
2858 bgp_process(&bgp_peers
[i
], isr
, isw
);
2864 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
2867 if (FD_ISSET(udpfd
, &r
))
2869 alen
= sizeof(addr
);
2870 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
2872 processudp(buf
, s
, &addr
);
2883 if (FD_ISSET(tunfd
, &r
))
2885 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
2898 if (FD_ISSET(cluster_sockfd
, &r
))
2900 alen
= sizeof(addr
);
2901 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
2903 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
2908 FD_CLR(cluster_sockfd
, &r
);
2914 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
2915 STAT(multi_read_used
);
2917 if (c
>= config
->multi_read_count
)
2919 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
2920 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
2922 STAT(multi_read_exceeded
);
2926 // Runs on every machine (master and slaves).
2927 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
2929 // Check to see which of the cluster is still alive..
2931 cluster_send_ping(basetime
); // Only does anything if we're a slave
2932 cluster_check_master(); // ditto.
2934 cluster_heartbeat(); // Only does anything if we're a master.
2935 cluster_check_slaves(); // ditto.
2937 master_update_counts(); // If we're a slave, send our byte counters to our master.
2939 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
2940 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
2942 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
2945 // Run token bucket filtering queue..
2946 // Only run it every 1/10th of a second.
2947 // Runs on all machines both master and slave.
2949 static clockt last_run
= 0;
2950 if (last_run
!= TIME
)
2957 /* Handle timeouts. Make sure that this gets run anyway, even if there was
2958 * something to read, else under load this will never actually run....
2961 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
2963 if (regular_cleanups())
2966 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
2970 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
2975 // Are we the master and shutting down??
2976 if (config
->cluster_iam_master
)
2977 cluster_heartbeat(); // Flush any queued changes..
2979 // Ok. Notify everyone we're shutting down. If we're
2980 // the master, this will force an election.
2981 cluster_send_ping(0);
2984 // Important!!! We MUST not process any packets past this point!
2987 static void stripdomain(char *host
)
2991 if ((p
= strchr(host
, '.')))
2997 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3003 while (fgets(buf
, sizeof(buf
), resolv
))
3005 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3008 if (!isspace(buf
[6]))
3012 while (isspace(*b
)) b
++;
3017 while (*b
&& !isspace(*b
)) b
++;
3019 if (buf
[0] == 'd') // domain is canonical
3025 // first search line
3028 // hold, may be subsequent domain line
3029 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3040 int hl
= strlen(host
);
3041 int dl
= strlen(domain
);
3042 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3043 host
[hl
-dl
- 1] = 0;
3047 *p
= 0; // everything after first dot
3052 // Init data structures
3053 static void initdata(int optdebug
, char *optconfig
)
3057 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3059 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3062 if (!(config
= shared_malloc(sizeof(configt
))))
3064 LOG(0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno
));
3067 memset(config
, 0, sizeof(configt
));
3068 time(&config
->start_time
);
3069 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3070 config
->debug
= optdebug
;
3071 config
->num_tbfs
= MAXTBFS
;
3072 config
->rl_rate
= 28; // 28kbps
3073 strcpy(config
->random_device
, RANDOMDEVICE
);
3075 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3077 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3080 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3082 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3086 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3088 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3092 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3094 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3098 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3100 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3104 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3106 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3109 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3112 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3114 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3117 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3120 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3122 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3125 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3127 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3129 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3132 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3134 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3135 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3136 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3137 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3139 // Put all the sessions on the free list marked as undefined.
3140 for (i
= 1; i
< MAXSESSION
- 1; i
++)
3142 session
[i
].next
= i
+ 1;
3143 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3145 session
[MAXSESSION
- 1].next
= 0;
3148 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3149 for (i
= 1; i
< MAXTUNNEL
- 1; i
++)
3150 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3154 // Grab my hostname unless it's been specified
3155 gethostname(hostname
, sizeof(hostname
));
3156 stripdomain(hostname
);
3159 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3162 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3164 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3170 static int assign_ip_address(sessionidt s
)
3174 time_t best_time
= time_now
;
3175 char *u
= session
[s
].user
;
3179 CSTAT(assign_ip_address
);
3181 for (i
= 1; i
< ip_pool_size
; i
++)
3183 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3186 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3193 if (ip_address_pool
[i
].last
< best_time
)
3196 if (!(best_time
= ip_address_pool
[i
].last
))
3197 break; // never used, grab this one
3203 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3207 session
[s
].ip
= ip_address_pool
[best
].address
;
3208 session
[s
].ip_pool_index
= best
;
3209 ip_address_pool
[best
].assigned
= 1;
3210 ip_address_pool
[best
].last
= time_now
;
3211 ip_address_pool
[best
].session
= s
;
3212 if (session
[s
].walled_garden
)
3213 /* Don't track addresses of users in walled garden (note: this
3214 means that their address isn't "sticky" even if they get
3216 ip_address_pool
[best
].user
[0] = 0;
3218 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3221 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3222 reuse
? "Reusing" : "Allocating", best
);
3227 static void free_ip_address(sessionidt s
)
3229 int i
= session
[s
].ip_pool_index
;
3232 CSTAT(free_ip_address
);
3235 return; // what the?
3237 if (i
< 0) // Is this actually part of the ip pool?
3241 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3243 ip_address_pool
[i
].assigned
= 0;
3244 ip_address_pool
[i
].session
= 0;
3245 ip_address_pool
[i
].last
= time_now
;
3249 // Fsck the address pool against the session table.
3250 // Normally only called when we become a master.
3252 // This isn't perfect: We aren't keep tracking of which
3253 // users used to have an IP address.
3255 void rebuild_address_pool(void)
3260 // Zero the IP pool allocation, and build
3261 // a map from IP address to pool index.
3262 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3264 ip_address_pool
[i
].assigned
= 0;
3265 ip_address_pool
[i
].session
= 0;
3266 if (!ip_address_pool
[i
].address
)
3269 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3272 for (i
= 0; i
< MAXSESSION
; ++i
)
3275 if (!session
[i
].ip
|| !session
[i
].tunnel
)
3277 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3279 if (session
[i
].ip_pool_index
< 0)
3281 // Not allocated out of the pool.
3282 if (ipid
< 1) // Not found in the pool either? good.
3285 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3286 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3288 // Fall through and process it as part of the pool.
3292 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3294 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3296 session
[i
].ip_pool_index
= ipid
;
3300 ip_address_pool
[ipid
].assigned
= 1;
3301 ip_address_pool
[ipid
].session
= i
;
3302 ip_address_pool
[ipid
].last
= time_now
;
3303 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3304 session
[i
].ip_pool_index
= ipid
;
3305 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3310 // Fix the address pool to match a changed session.
3311 // (usually when the master sends us an update).
3312 static void fix_address_pool(int sid
)
3316 ipid
= session
[sid
].ip_pool_index
;
3318 if (ipid
> ip_pool_size
)
3319 return; // Ignore it. rebuild_address_pool will fix it up.
3321 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3322 return; // Just ignore it. rebuild_address_pool will take care of it.
3324 ip_address_pool
[ipid
].assigned
= 1;
3325 ip_address_pool
[ipid
].session
= sid
;
3326 ip_address_pool
[ipid
].last
= time_now
;
3327 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3331 // Add a block of addresses to the IP pool to hand out.
3333 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3337 mask
= 0xffffffff; // Host route only.
3341 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3344 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3346 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3347 continue; // Skip 0 and broadcast addresses.
3349 ip_address_pool
[ip_pool_size
].address
= i
;
3350 ip_address_pool
[ip_pool_size
].assigned
= 0;
3352 if (ip_pool_size
>= MAXIPPOOL
)
3354 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3360 // Initialize the IP address pool
3361 static void initippool()
3366 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3368 if (!(f
= fopen(IPPOOLFILE
, "r")))
3370 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3374 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3377 buf
[4095] = 0; // Force it to be zero terminated/
3379 if (*buf
== '#' || *buf
== '\n')
3380 continue; // Skip comments / blank lines
3381 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3382 if ((p
= (char *)strchr(buf
, ':')))
3386 src
= inet_addr(buf
);
3387 if (src
== INADDR_NONE
)
3389 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3392 // This entry is for a specific IP only
3393 if (src
!= config
->bind_address
)
3398 if ((p
= (char *)strchr(pool
, '/')))
3402 in_addr_t start
= 0, mask
= 0;
3404 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3406 if (!*p
|| !(numbits
= atoi(p
)))
3408 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3411 start
= ntohl(inet_addr(pool
));
3412 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3414 // Add a static route for this pool
3415 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3416 fmtaddr(htonl(start
), 0), 32 + mask
);
3418 routeset(0, start
, mask
, 0, 1);
3420 add_to_ip_pool(start
, mask
);
3424 // It's a single ip address
3425 add_to_ip_pool(inet_addr(pool
), 0);
3429 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3432 void snoop_send_packet(char *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3434 struct sockaddr_in snoop_addr
= {0};
3435 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3438 snoop_addr
.sin_family
= AF_INET
;
3439 snoop_addr
.sin_addr
.s_addr
= destination
;
3440 snoop_addr
.sin_port
= ntohs(port
);
3442 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3443 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3444 htons(snoop_addr
.sin_port
));
3446 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3447 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3449 STAT(packets_snooped
);
3452 static int dump_session(FILE **f
, sessiont
*s
)
3454 if (!s
->opened
|| !s
->ip
|| !(s
->cin
|| s
->cout
) || !*s
->user
|| s
->walled_garden
)
3459 char filename
[1024];
3461 time_t now
= time(NULL
);
3463 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3464 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3466 if (!(*f
= fopen(filename
, "w")))
3468 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3472 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3473 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3477 "# format: username ip qos uptxoctets downrxoctets\n",
3483 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3484 fprintf(*f
, "%s %s %d %u %u\n",
3485 s
->user
, // username
3486 fmtaddr(htonl(s
->ip
), 0), // ip
3487 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3488 (uint32_t) s
->cin
, // uptxoctets
3489 (uint32_t) s
->cout
); // downrxoctets
3491 s
->pin
= s
->cin
= 0;
3492 s
->pout
= s
->cout
= 0;
3497 static void dump_acct_info(int all
)
3503 CSTAT(dump_acct_info
);
3507 for (i
= 0; i
< shut_acct_n
; i
++)
3508 dump_session(&f
, &shut_acct
[i
]);
3514 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3515 dump_session(&f
, &session
[i
]);
3522 int main(int argc
, char *argv
[])
3526 char *optconfig
= CONFIGFILE
;
3528 time(&basetime
); // start clock
3531 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3536 if (fork()) exit(0);
3538 freopen("/dev/null", "r", stdin
);
3539 freopen("/dev/null", "w", stdout
);
3540 freopen("/dev/null", "w", stderr
);
3549 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3552 printf("Args are:\n"
3553 "\t-d\t\tDetach from terminal\n"
3554 "\t-c <file>\tConfig file\n"
3555 "\t-h <hostname>\tForce hostname\n"
3563 // Start the timer routine off
3565 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3566 signal(SIGALRM
, sigalrm_handler
);
3567 siginterrupt(SIGALRM
, 0);
3570 initdata(optdebug
, optconfig
);
3574 init_tbf(config
->num_tbfs
);
3576 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3577 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3578 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3581 rlim
.rlim_cur
= RLIM_INFINITY
;
3582 rlim
.rlim_max
= RLIM_INFINITY
;
3583 // Remove the maximum core size
3584 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3585 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3587 // Make core dumps go to /tmp
3591 if (config
->scheduler_fifo
)
3594 struct sched_param params
= {0};
3595 params
.sched_priority
= 1;
3597 if (get_nprocs() < 2)
3599 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3600 config
->scheduler_fifo
= 0;
3604 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3606 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3610 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3611 config
->scheduler_fifo
= 0;
3616 /* Set up the cluster communications port. */
3617 if (cluster_init() < 0)
3621 signal(SIGPIPE
, SIG_IGN
);
3622 bgp_setup(config
->as_number
);
3623 bgp_add_route(config
->bind_address
, 0xffffffff);
3624 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3626 if (config
->neighbour
[i
].name
[0])
3627 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3628 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3629 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3634 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3642 signal(SIGHUP
, sighup_handler
);
3643 signal(SIGTERM
, sigterm_handler
);
3644 signal(SIGINT
, sigterm_handler
);
3645 signal(SIGQUIT
, sigquit_handler
);
3646 signal(SIGCHLD
, sigchild_handler
);
3648 // Prevent us from getting paged out
3649 if (config
->lock_pages
)
3651 if (!mlockall(MCL_CURRENT
))
3652 LOG(1, 0, 0, "Locking pages into memory\n");
3654 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3659 // Drop privileges here
3660 if (config
->target_uid
> 0 && geteuid() == 0)
3661 setuid(config
->target_uid
);
3666 /* try to shut BGP down cleanly; with luck the sockets will be
3667 writable since we're out of the select */
3668 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3669 if (bgp_peers
[i
].state
== Established
)
3670 bgp_stop(&bgp_peers
[i
]);
3673 /* remove plugins (so cleanup code gets run) */
3676 // Remove the PID file if we wrote it
3677 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3678 unlink(config
->pid_file
);
3680 /* kill CLI children */
3681 signal(SIGTERM
, SIG_IGN
);
3686 static void sighup_handler(int sig
)
3688 if (log_stream
&& log_stream
!= stderr
)
3697 static void sigalrm_handler(int sig
)
3699 // Log current traffic stats
3701 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3702 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3703 (udp_rx
/ 1024.0 / 1024.0 * 8),
3704 (eth_tx
/ 1024.0 / 1024.0 * 8),
3705 (eth_rx
/ 1024.0 / 1024.0 * 8),
3706 (udp_tx
/ 1024.0 / 1024.0 * 8),
3707 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3708 udp_rx_pkt
, eth_rx_pkt
);
3710 udp_tx
= udp_rx
= 0;
3711 udp_rx_pkt
= eth_rx_pkt
= 0;
3712 eth_tx
= eth_rx
= 0;
3714 if (config
->dump_speed
)
3715 printf("%s\n", config
->bandwidth
);
3717 // Update the internal time counter
3719 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3724 struct param_timer p
= { time_now
};
3725 run_plugins(PLUGIN_TIMER
, &p
);
3730 static void sigterm_handler(int sig
)
3732 LOG(1, 0, 0, "Shutting down cleanly\n");
3733 if (config
->save_state
)
3739 static void sigquit_handler(int sig
)
3743 LOG(1, 0, 0, "Shutting down without saving sessions\n");
3745 if (config
->cluster_iam_master
)
3747 for (i
= 1; i
< MAXSESSION
; i
++)
3749 if (session
[i
].opened
)
3750 sessionkill(i
, "L2TPNS Closing");
3752 for (i
= 1; i
< MAXTUNNEL
; i
++)
3754 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3755 tunnelshutdown(i
, "L2TPNS Closing");
3762 static void sigchild_handler(int sig
)
3764 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3768 static void read_state()
3774 char magic
[sizeof(DUMP_MAGIC
) - 1];
3777 if (!config
->save_state
)
3783 if (stat(STATEFILE
, &sb
) < 0)
3789 if (sb
.st_mtime
< (time(NULL
) - 60))
3791 LOG(0, 0, 0, "State file is too old to read, ignoring\n");
3796 f
= fopen(STATEFILE
, "r");
3801 LOG(0, 0, 0, "Can't read state file: %s\n", strerror(errno
));
3805 if (fread(magic
, sizeof(magic
), 1, f
) != 1 || strncmp(magic
, DUMP_MAGIC
, sizeof(magic
)))
3807 LOG(0, 0, 0, "Bad state file magic\n");
3811 LOG(1, 0, 0, "Reading state information\n");
3812 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] > MAXIPPOOL
|| buf
[1] != sizeof(ippoolt
))
3814 LOG(0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
3818 if (buf
[0] > ip_pool_size
)
3820 LOG(0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf
[0], ip_pool_size
);
3824 LOG(2, 0, 0, "Loading %u ip addresses\n", buf
[0]);
3825 for (i
= 0; i
< buf
[0]; i
++)
3827 if (fread(&itmp
, sizeof(itmp
), 1, f
) != 1)
3829 LOG(0, 0, 0, "Error reading ip %d from state file: %s\n", i
, strerror(errno
));
3833 if (itmp
.address
!= ip_address_pool
[i
].address
)
3835 LOG(0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i
);
3839 memcpy(&ip_address_pool
[i
], &itmp
, sizeof(itmp
));
3842 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXTUNNEL
|| buf
[1] != sizeof(tunnelt
))
3844 LOG(0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
3848 LOG(2, 0, 0, "Loading %u tunnels\n", MAXTUNNEL
);
3849 if (fread(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3851 LOG(0, 0, 0, "Error reading tunnel data from state file\n");
3855 for (i
= 0; i
< MAXTUNNEL
; i
++)
3857 tunnel
[i
].controlc
= 0;
3858 tunnel
[i
].controls
= NULL
;
3859 tunnel
[i
].controle
= NULL
;
3860 if (*tunnel
[i
].hostname
)
3861 LOG(3, 0, 0, "Created tunnel for %s\n", tunnel
[i
].hostname
);
3864 if (fread(buf
, sizeof(buf
), 1, f
) != 1 || buf
[0] != MAXSESSION
|| buf
[1] != sizeof(sessiont
))
3866 LOG(0, 0, 0, "Error/mismatch reading session header from state file\n");
3870 LOG(2, 0, 0, "Loading %u sessions\n", MAXSESSION
);
3871 if (fread(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3873 LOG(0, 0, 0, "Error reading session data from state file\n");
3877 for (i
= 0; i
< MAXSESSION
; i
++)
3879 session
[i
].tbf_in
= 0;
3880 session
[i
].tbf_out
= 0;
3881 if (session
[i
].opened
)
3883 LOG(2, i
, 0, "Loaded active session for user %s\n", session
[i
].user
);
3885 sessionsetup(session
[i
].tunnel
, i
);
3890 LOG(0, 0, 0, "Loaded saved state information\n");
3893 static void dump_state()
3898 if (!config
->save_state
)
3903 if (!(f
= fopen(STATEFILE
, "w")))
3906 LOG(1, 0, 0, "Dumping state information\n");
3908 if (fwrite(DUMP_MAGIC
, sizeof(DUMP_MAGIC
) - 1, 1, f
) != 1)
3911 LOG(2, 0, 0, "Dumping %u ip addresses\n", ip_pool_size
);
3912 buf
[0] = ip_pool_size
;
3913 buf
[1] = sizeof(ippoolt
);
3914 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3916 if (fwrite(ip_address_pool
, sizeof(ippoolt
), ip_pool_size
, f
) != ip_pool_size
)
3919 LOG(2, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL
);
3921 buf
[1] = sizeof(tunnelt
);
3922 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3924 if (fwrite(tunnel
, sizeof(tunnelt
), MAXTUNNEL
, f
) != MAXTUNNEL
)
3927 LOG(2, 0, 0, "Dumping %u sessions\n", MAXSESSION
);
3928 buf
[0] = MAXSESSION
;
3929 buf
[1] = sizeof(sessiont
);
3930 if (fwrite(buf
, sizeof(buf
), 1, f
) != 1)
3932 if (fwrite(session
, sizeof(sessiont
), MAXSESSION
, f
) != MAXSESSION
)
3940 LOG(0, 0, 0, "Can't write state information: %s\n", strerror(errno
));
3944 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
)
3947 *challenge_response
= NULL
;
3949 if (!*config
->l2tpsecret
)
3951 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3955 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
3957 *challenge_response
= (char *)calloc(17, 1);
3960 MD5Update(&ctx
, &id
, 1);
3961 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3962 MD5Update(&ctx
, challenge
, challenge_length
);
3963 MD5Final(*challenge_response
, &ctx
);
3968 static int facility_value(char *name
)
3971 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3973 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3974 return facilitynames
[i
].c_val
;
3979 static void update_config()
3983 static int timeout
= 0;
3984 static int interval
= 0;
3995 if (*config
->log_filename
)
3997 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3999 char *p
= config
->log_filename
+ 7;
4002 openlog("l2tpns", LOG_PID
, facility_value(p
));
4006 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4008 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4010 fseek(log_stream
, 0, SEEK_END
);
4011 setbuf(log_stream
, NULL
);
4015 log_stream
= stderr
;
4016 setbuf(log_stream
, NULL
);
4022 log_stream
= stderr
;
4023 setbuf(log_stream
, NULL
);
4027 config
->numradiusservers
= 0;
4028 for (i
= 0; i
< MAXRADSERVER
; i
++)
4029 if (config
->radiusserver
[i
])
4031 config
->numradiusservers
++;
4032 // Set radius port: if not set, take the port from the
4033 // first radius server. For the first radius server,
4034 // take the #defined default value from l2tpns.h
4036 // test twice, In case someone works with
4037 // a secondary radius server without defining
4038 // a primary one, this will work even then.
4039 if (i
>0 && !config
->radiusport
[i
])
4040 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4041 if (!config
->radiusport
[i
])
4042 config
->radiusport
[i
] = RADPORT
;
4045 if (!config
->numradiusservers
)
4046 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4048 config
->num_radfds
= 2 << RADIUS_SHIFT
;
4050 // parse radius_authtypes_s
4051 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4052 p
= config
->radius_authtypes_s
;
4055 char *s
= strpbrk(p
, " \t,");
4061 while (*s
== ' ' || *s
== '\t')
4068 if (!strncasecmp("chap", p
, strlen(p
)))
4070 else if (!strncasecmp("pap", p
, strlen(p
)))
4073 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"", p
);
4075 config
->radius_authtypes
|= type
;
4076 if (!config
->radius_authprefer
)
4077 config
->radius_authprefer
= type
;
4080 if (!config
->radius_authtypes
)
4082 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4083 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4086 // normalise radius_authtypes_s
4087 if (config
->radius_authprefer
== AUTHPAP
)
4089 strcpy(config
->radius_authtypes_s
, "pap");
4090 if (config
->radius_authtypes
& AUTHCHAP
)
4091 strcat(config
->radius_authtypes_s
, ", chap");
4095 strcpy(config
->radius_authtypes_s
, "chap");
4096 if (config
->radius_authtypes
& AUTHPAP
)
4097 strcat(config
->radius_authtypes_s
, ", pap");
4100 // re-initialise the random number source
4101 initrandom(config
->random_device
);
4104 for (i
= 0; i
< MAXPLUGINS
; i
++)
4106 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4109 if (*config
->plugins
[i
])
4112 add_plugin(config
->plugins
[i
]);
4114 else if (*config
->old_plugins
[i
])
4117 remove_plugin(config
->old_plugins
[i
]);
4121 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4122 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
4123 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4124 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4125 if (!*config
->cluster_interface
)
4126 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4128 if (!config
->cluster_hb_interval
)
4129 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4131 if (!config
->cluster_hb_timeout
)
4132 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4134 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4136 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4137 // late, ensure we're sufficiently larger than that
4138 int t
= 4 * config
->cluster_hb_interval
+ 11;
4140 if (config
->cluster_hb_timeout
< t
)
4142 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4143 config
->cluster_hb_timeout
= t
;
4146 // Push timing changes to the slaves immediately if we're the master
4147 if (config
->cluster_iam_master
)
4148 cluster_heartbeat();
4150 interval
= config
->cluster_hb_interval
;
4151 timeout
= config
->cluster_hb_timeout
;
4155 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4158 if ((f
= fopen(config
->pid_file
, "w")))
4160 fprintf(f
, "%d\n", getpid());
4162 config
->wrote_pid
= 1;
4166 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4170 config
->reload_config
= 0;
4173 static void read_config_file()
4177 if (!config
->config_file
) return;
4178 if (!(f
= fopen(config
->config_file
, "r")))
4180 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4184 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4186 LOG(3, 0, 0, "Done reading config file\n");
4191 int sessionsetup(tunnelidt t
, sessionidt s
)
4193 // A session now exists, set it up
4199 CSTAT(sessionsetup
);
4201 LOG(3, s
, t
, "Doing session setup for session\n");
4203 if (!session
[s
].ip
|| session
[s
].ip
== 0xFFFFFFFE)
4205 assign_ip_address(s
);
4208 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4209 sessionshutdown(s
, "No IP addresses available");
4212 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4213 fmtaddr(htonl(session
[s
].ip
), 0));
4217 // Make sure this is right
4218 session
[s
].tunnel
= t
;
4220 // zap old sessions with same IP and/or username
4221 // Don't kill gardened sessions - doing so leads to a DoS
4222 // from someone who doesn't need to know the password
4225 user
= session
[s
].user
;
4226 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4228 if (i
== s
) continue;
4229 if (ip
== session
[i
].ip
) sessionkill(i
, "Duplicate IP address");
4230 if (!session
[s
].walled_garden
&& !session
[i
].walled_garden
&& strcasecmp(user
, session
[i
].user
) == 0)
4231 sessionkill(i
, "Duplicate session for users");
4238 // Add the route for this session.
4239 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4241 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4242 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4245 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4248 // Static IPs need to be routed if not already
4249 // convered by a Framed-Route. Anything else is part
4250 // of the IP address pool and is already routed, it
4251 // just needs to be added to the IP cache.
4252 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4253 if (session
[s
].ip_pool_index
== -1) // static ip
4255 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4258 cache_ipmap(session
[s
].ip
, s
);
4261 if (!session
[s
].unique_id
)
4263 // did this session just finish radius?
4264 LOG(3, s
, t
, "Sending initial IPCP to client\n");
4266 session
[s
].unique_id
= ++last_id
;
4269 // Run the plugin's against this new session.
4271 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4272 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4275 // Allocate TBFs if throttled
4276 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4277 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4279 session
[s
].last_packet
= time_now
;
4281 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4282 fmtaddr(htonl(session
[s
].ip
), 0),
4283 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4285 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4287 return 1; // RADIUS OK and IP allocated, done...
4291 // This session just got dropped on us by the master or something.
4292 // Make sure our tables up up to date...
4294 int load_session(sessionidt s
, sessiont
*new)
4300 if (new->ip_pool_index
>= MAXIPPOOL
||
4301 new->tunnel
>= MAXTUNNEL
)
4303 LOG(0, s
, 0, "Strange session update received!\n");
4304 // FIXME! What to do here?
4309 // Ok. All sanity checks passed. Now we're committed to
4310 // loading the new session.
4313 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4315 // See if routes/ip cache need updating
4316 if (new->ip
!= session
[s
].ip
)
4319 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4320 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4321 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4329 // remove old routes...
4330 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4332 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4333 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4336 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4342 if (session
[s
].ip_pool_index
== -1) // static IP
4344 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4346 else // It's part of the IP pool, remove it manually.
4347 uncache_ipmap(session
[s
].ip
);
4352 // add new routes...
4353 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4355 if ((new->ip
& new->route
[i
].mask
) ==
4356 (new->route
[i
].ip
& new->route
[i
].mask
))
4359 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4365 // If there's a new one, add it.
4366 if (new->ip_pool_index
== -1)
4368 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4371 cache_ipmap(new->ip
, s
);
4376 if (new->flags
& SF_IPV6_ROUTED
&& !(session
[s
].flags
& SF_IPV6_ROUTED
))
4377 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4380 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4382 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4386 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4388 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4389 new->filter_out
= 0;
4392 if (new->filter_in
!= session
[s
].filter_in
)
4394 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4395 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4398 if (new->filter_out
!= session
[s
].filter_out
)
4400 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4401 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4404 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4405 // for walking the sessions to forward byte counts to the master.
4406 config
->cluster_highest_sessionid
= s
;
4408 // TEMP: old session struct used a uint32_t to define the throttle
4409 // speed for both up/down, new uses a uint16_t for each. Deal with
4410 // sessions from an old master for migration.
4411 if (new->throttle_out
== 0 && new->tbf_out
)
4412 new->throttle_out
= new->throttle_in
;
4414 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4416 // Do fixups into address pool.
4417 if (new->ip_pool_index
!= -1)
4418 fix_address_pool(s
);
4423 static void initplugins()
4427 loaded_plugins
= ll_init();
4428 // Initialize the plugins to nothing
4429 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4430 plugins
[i
] = ll_init();
4433 static void *open_plugin(char *plugin_name
, int load
)
4435 char path
[256] = "";
4437 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4438 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4439 return dlopen(path
, RTLD_NOW
);
4442 // plugin callback to get a config value
4443 static void *getconfig(char *key
, enum config_typet type
)
4447 for (i
= 0; config_values
[i
].key
; i
++)
4449 if (!strcmp(config_values
[i
].key
, key
))
4451 if (config_values
[i
].type
== type
)
4452 return ((void *) config
) + config_values
[i
].offset
;
4454 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4455 key
, type
, config_values
[i
].type
);
4461 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4465 static int add_plugin(char *plugin_name
)
4467 static struct pluginfuncs funcs
= {
4472 sessiontbysessionidt
,
4473 sessionidtbysessiont
,
4479 cluster_send_session
,
4482 void *p
= open_plugin(plugin_name
, 1);
4483 int (*initfunc
)(struct pluginfuncs
*);
4488 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4492 if (ll_contains(loaded_plugins
, p
))
4495 return 0; // already loaded
4499 int *v
= dlsym(p
, "plugin_api_version");
4500 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4502 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4508 if ((initfunc
= dlsym(p
, "plugin_init")))
4510 if (!initfunc(&funcs
))
4512 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4518 ll_push(loaded_plugins
, p
);
4520 for (i
= 0; i
< max_plugin_functions
; i
++)
4523 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4525 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4526 ll_push(plugins
[i
], x
);
4530 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4534 static void run_plugin_done(void *plugin
)
4536 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4542 static int remove_plugin(char *plugin_name
)
4544 void *p
= open_plugin(plugin_name
, 0);
4550 if (ll_contains(loaded_plugins
, p
))
4553 for (i
= 0; i
< max_plugin_functions
; i
++)
4556 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4557 ll_delete(plugins
[i
], x
);
4560 ll_delete(loaded_plugins
, p
);
4566 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4570 int run_plugins(int plugin_type
, void *data
)
4572 int (*func
)(void *data
);
4574 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4575 return PLUGIN_RET_ERROR
;
4577 ll_reset(plugins
[plugin_type
]);
4578 while ((func
= ll_next(plugins
[plugin_type
])))
4582 if (r
!= PLUGIN_RET_OK
)
4583 return r
; // stop here
4586 return PLUGIN_RET_OK
;
4589 static void plugins_done()
4593 ll_reset(loaded_plugins
);
4594 while ((p
= ll_next(loaded_plugins
)))
4598 static void processcontrol(uint8_t * buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4600 struct nsctl request
;
4601 struct nsctl response
;
4602 int type
= unpack_control(&request
, buf
, len
);
4606 if (log_stream
&& config
->debug
>= 4)
4610 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4611 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4615 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4616 dump_control(&request
, log_stream
);
4622 case NSCTL_REQ_LOAD
:
4623 if (request
.argc
!= 1)
4625 response
.type
= NSCTL_RES_ERR
;
4627 response
.argv
[0] = "name of plugin required";
4629 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4631 response
.type
= NSCTL_RES_ERR
;
4633 response
.argv
[0] = !r
4634 ? "plugin already loaded"
4635 : "error loading plugin";
4639 response
.type
= NSCTL_RES_OK
;
4645 case NSCTL_REQ_UNLOAD
:
4646 if (request
.argc
!= 1)
4648 response
.type
= NSCTL_RES_ERR
;
4650 response
.argv
[0] = "name of plugin required";
4652 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4654 response
.type
= NSCTL_RES_ERR
;
4656 response
.argv
[0] = !r
4657 ? "plugin not loaded"
4658 : "plugin not found";
4662 response
.type
= NSCTL_RES_OK
;
4668 case NSCTL_REQ_HELP
:
4669 response
.type
= NSCTL_RES_OK
;
4672 ll_reset(loaded_plugins
);
4673 while ((p
= ll_next(loaded_plugins
)))
4675 char **help
= dlsym(p
, "plugin_control_help");
4676 while (response
.argc
< 0xff && help
&& *help
)
4677 response
.argv
[response
.argc
++] = *help
++;
4682 case NSCTL_REQ_CONTROL
:
4684 struct param_control param
= {
4685 config
->cluster_iam_master
,
4692 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4694 if (r
== PLUGIN_RET_ERROR
)
4696 response
.type
= NSCTL_RES_ERR
;
4698 response
.argv
[0] = param
.additional
4700 : "error returned by plugin";
4702 else if (r
== PLUGIN_RET_NOTMASTER
)
4704 static char msg
[] = "must be run on master: 000.000.000.000";
4706 response
.type
= NSCTL_RES_ERR
;
4708 if (config
->cluster_master_address
)
4710 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4711 response
.argv
[0] = msg
;
4715 response
.argv
[0] = "must be run on master: none elected";
4718 else if (!(param
.response
& NSCTL_RESPONSE
))
4720 response
.type
= NSCTL_RES_ERR
;
4722 response
.argv
[0] = param
.response
4723 ? "unrecognised response value from plugin"
4724 : "unhandled action";
4728 response
.type
= param
.response
;
4730 if (param
.additional
)
4733 response
.argv
[0] = param
.additional
;
4741 response
.type
= NSCTL_RES_ERR
;
4743 response
.argv
[0] = "error unpacking control packet";
4746 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4749 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4753 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4756 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4757 if (log_stream
&& config
->debug
>= 4)
4759 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4760 dump_control(&response
, log_stream
);
4764 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4765 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4770 static tunnelidt
new_tunnel()
4773 for (i
= 1; i
< MAXTUNNEL
; i
++)
4775 if (tunnel
[i
].state
== TUNNELFREE
)
4777 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4778 if (i
> config
->cluster_highest_tunnelid
)
4779 config
->cluster_highest_tunnelid
= i
;
4783 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4788 // We're becoming the master. Do any required setup..
4790 // This is principally telling all the plugins that we're
4791 // now a master, and telling them about all the sessions
4792 // that are active too..
4794 void become_master(void)
4797 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4799 // running a bunch of iptables commands is slow and can cause
4800 // the master to drop tunnels on takeover--kludge around the
4801 // problem by forking for the moment (note: race)
4802 if (!fork_and_close())
4804 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4806 if (!session
[s
].tunnel
) // Not an in-use session.
4809 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4815 for (i
= 0; i
< config
->num_radfds
; i
++)
4817 FD_SET(radfds
[i
], &readset
);
4818 if (radfds
[i
] > readset_n
)
4819 readset_n
= radfds
[i
];
4823 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4829 if (CLI_HELP_REQUESTED
)
4830 return CLI_HELP_NO_ARGS
;
4833 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4835 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4838 if (!session
[s
].tunnel
)
4841 idle
= time_now
- session
[s
].last_packet
;
4842 idle
/= 5 ; // In multiples of 5 seconds.
4852 for (i
= 0; i
< 63; ++i
)
4854 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4856 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4857 cli_print(cli
, "%d total sessions open.", count
);
4861 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4867 if (CLI_HELP_REQUESTED
)
4868 return CLI_HELP_NO_ARGS
;
4871 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4873 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4876 if (!session
[s
].tunnel
)
4879 d
= time_now
- session
[s
].opened
;
4882 while (d
> 1 && open
< 32)
4892 for (i
= 0; i
< 30; ++i
)
4894 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4897 cli_print(cli
, "%d total sessions open.", count
);
4903 * This unencodes the AVP using the L2TP CHAP secret and the
4904 * previously stored random vector. It replaces the hidden data with
4905 * the cleartext data and returns the length of the cleartext data
4906 * (including the AVP "header" of 6 bytes).
4908 * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
4910 static int unhide_avp(uint8_t *avp
, tunnelidt t
, sessionidt s
, uint16_t length
)
4915 uint8_t working_vector
[16];
4916 uint16_t hidden_length
;
4921 // Find the AVP type.
4922 type
[0] = *(avp
+ 4);
4923 type
[1] = *(avp
+ 5);
4925 // Line up with the hidden data
4926 cursor
= output
= avp
+ 6;
4928 // Compute initial pad
4930 MD5Update(&ctx
, type
, 2);
4931 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4932 MD5Update(&ctx
, session
[s
].random_vector
, session
[s
].random_vector_length
);
4933 MD5Final(digest
, &ctx
);
4935 // Get hidden length
4936 hidden_length
= ((uint16_t) (digest
[0] ^ cursor
[0])) * 256 + (uint16_t) (digest
[1] ^ cursor
[1]);
4938 // Keep these for later use
4939 working_vector
[0] = *cursor
;
4940 working_vector
[1] = *(cursor
+ 1);
4943 if (hidden_length
> length
- 8)
4945 LOG(1, s
, t
, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length
, (int) length
);
4949 /* Decrypt remainder */
4951 todo
= hidden_length
;
4954 working_vector
[done
] = *cursor
;
4955 *output
= digest
[done
] ^ *cursor
;
4960 if (done
== 16 && todo
)
4962 // Compute new digest
4965 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4966 MD5Update(&ctx
, &working_vector
, 16);
4967 MD5Final(digest
, &ctx
);
4971 return hidden_length
+ 6;
4974 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
4978 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
4979 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
4980 case FILTER_PORT_OP_GT
: return port
> p
->port
;
4981 case FILTER_PORT_OP_LT
: return port
< p
->port
;
4982 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
4988 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
4992 case FILTER_FLAG_OP_ANY
:
4993 return (flags
& sflags
) || (~flags
& cflags
);
4995 case FILTER_FLAG_OP_ALL
:
4996 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
4998 case FILTER_FLAG_OP_EST
:
4999 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5005 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5007 uint16_t frag_offset
;
5011 uint16_t src_port
= 0;
5012 uint16_t dst_port
= 0;
5014 ip_filter_rulet
*rule
;
5016 if (len
< 20) // up to end of destination address
5019 if ((*buf
>> 4) != 4) // IPv4
5022 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5024 src_ip
= *(in_addr_t
*) (buf
+ 12);
5025 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5027 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5029 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5030 if (len
< l
+ 4) // ports
5033 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5034 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5035 if (proto
== IPPROTO_TCP
)
5037 if (len
< l
+ 14) // flags
5040 flags
= buf
[l
+ 13] & 0x3f;
5044 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5046 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5049 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5050 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5053 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5054 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5059 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5067 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5069 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5072 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5075 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5076 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5083 return rule
->action
== FILTER_ACTION_PERMIT
;