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 1.121 2005/08/11 05:50:24 bodea Exp $";
13 #include <linux/if_tun.h>
18 #include <net/route.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
32 #include <sys/resource.h>
40 #include <sys/sysinfo.h>
48 #include "constants.h"
58 configt
*config
= NULL
; // all configuration
59 int tunfd
= -1; // tun interface file handle. (network device)
60 int udpfd
= -1; // UDP file handle
61 int controlfd
= -1; // Control signal handle
62 int clifd
= -1; // Socket listening for CLI connections.
63 int daefd
= -1; // Socket listening for DAE connections.
64 int snoopfd
= -1; // UDP file handle for sending out intercept data
65 int *radfds
= NULL
; // RADIUS requests file handles
66 int ifrfd
= -1; // File descriptor for routing, etc
67 int ifr6fd
= -1; // File descriptor for IPv6 routing, etc
68 int rand_fd
= -1; // Random data source
69 int cluster_sockfd
= -1; // Intra-cluster communications socket.
70 int epollfd
= -1; // event polling
71 time_t basetime
= 0; // base clock
72 char hostname
[1000] = ""; // us.
73 static int tunidx
; // ifr_ifindex of tun device
74 static int syslog_log
= 0; // are we logging to syslog
75 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id
= 0; // Unique ID for radius accounting
78 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
79 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
81 static void *ip_hash
[256]; // Mapping from IP address to session structures.
84 struct ipv6radix
*branch
;
85 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
88 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
89 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
92 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
93 time_t time_now
= 0; // Current time in seconds since epoch.
94 static char time_now_string
[64] = {0}; // Current time as a string.
95 char main_quit
= 0; // True if we're in the process of exiting.
96 linked_list
*loaded_plugins
;
97 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
99 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
100 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
102 config_descriptt config_values
[] = {
103 CONFIG("debug", debug
, INT
),
104 CONFIG("log_file", log_filename
, STRING
),
105 CONFIG("pid_file", pid_file
, STRING
),
106 CONFIG("random_device", random_device
, STRING
),
107 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
108 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
109 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
110 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
111 CONFIG("primary_dns", default_dns1
, IPv4
),
112 CONFIG("secondary_dns", default_dns2
, IPv4
),
113 CONFIG("primary_radius", radiusserver
[0], IPv4
),
114 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
115 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
116 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
117 CONFIG("radius_accounting", radius_accounting
, BOOL
),
118 CONFIG("radius_interim", radius_interim
, INT
),
119 CONFIG("radius_secret", radiussecret
, STRING
),
120 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
121 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
122 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
123 CONFIG("bind_address", bind_address
, IPv4
),
124 CONFIG("peer_address", peer_address
, IPv4
),
125 CONFIG("send_garp", send_garp
, BOOL
),
126 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
127 CONFIG("throttle_buckets", num_tbfs
, INT
),
128 CONFIG("accounting_dir", accounting_dir
, STRING
),
129 CONFIG("setuid", target_uid
, INT
),
130 CONFIG("dump_speed", dump_speed
, BOOL
),
131 CONFIG("multi_read_count", multi_read_count
, INT
),
132 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
133 CONFIG("lock_pages", lock_pages
, BOOL
),
134 CONFIG("icmp_rate", icmp_rate
, INT
),
135 CONFIG("packet_limit", max_packets
, INT
),
136 CONFIG("cluster_address", cluster_address
, IPv4
),
137 CONFIG("cluster_interface", cluster_interface
, STRING
),
138 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
139 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
140 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
141 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
145 static char *plugin_functions
[] = {
152 "plugin_new_session",
153 "plugin_kill_session",
155 "plugin_radius_response",
156 "plugin_radius_reset",
157 "plugin_become_master",
158 "plugin_new_session_master",
161 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
163 // Counters for shutdown sessions
164 static sessiont shut_acct
[8192];
165 static sessionidt shut_acct_n
= 0;
167 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
168 sessiont
*session
= NULL
; // Array of session structures.
169 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
170 radiust
*radius
= NULL
; // Array of radius structures.
171 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
172 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
173 static controlt
*controlfree
= 0;
174 struct Tstats
*_statistics
= NULL
;
176 struct Tringbuffer
*ringbuffer
= NULL
;
179 static void cache_ipmap(in_addr_t ip
, int s
);
180 static void uncache_ipmap(in_addr_t ip
);
181 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
182 static void free_ip_address(sessionidt s
);
183 static void dump_acct_info(int all
);
184 static void sighup_handler(int sig
);
185 static void sigalrm_handler(int sig
);
186 static void shutdown_handler(int sig
);
187 static void sigchild_handler(int sig
);
188 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
189 static void update_config(void);
190 static void read_config_file(void);
191 static void initplugins(void);
192 static int add_plugin(char *plugin_name
);
193 static int remove_plugin(char *plugin_name
);
194 static void plugins_done(void);
195 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
196 static tunnelidt
new_tunnel(void);
197 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
199 // on slaves, alow BGP to withdraw cleanly before exiting
202 // quit actions (master)
203 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
204 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
206 // return internal time (10ths since process startup), set f if given
207 static clockt
now(double *f
)
211 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
212 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
215 // work out a retry time based on try number
216 // This is a straight bounded exponential backoff.
217 // Maximum re-try time is 32 seconds. (2^5).
218 clockt
backoff(uint8_t try)
220 if (try > 5) try = 5; // max backoff
221 return now(NULL
) + 10 * (1 << try);
226 // Log a debug message. Typically called via the LOG macro
228 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
230 static char message
[65536] = {0};
236 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
237 ringbuffer
->tail
= 0;
238 if (ringbuffer
->tail
== ringbuffer
->head
)
239 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
240 ringbuffer
->head
= 0;
242 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
243 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
244 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
245 va_start(ap
, format
);
246 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
251 if (config
->debug
< level
) return;
253 va_start(ap
, format
);
254 vsnprintf(message
, sizeof(message
), format
, ap
);
257 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
259 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
264 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
267 const uint8_t *d
= data
;
269 if (config
->debug
< level
) return;
271 // No support for _log_hex to syslog
274 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
275 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
277 for (i
= 0; i
< maxsize
; )
279 fprintf(log_stream
, "%4X: ", i
);
280 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
282 fprintf(log_stream
, "%02X ", d
[j
]);
284 fputs(": ", log_stream
);
287 for (; j
< i
+ 16; j
++)
289 fputs(" ", log_stream
);
291 fputs(": ", log_stream
);
294 fputs(" ", log_stream
);
295 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
297 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
298 fputc(d
[j
], log_stream
);
300 fputc('.', log_stream
);
303 fputs(" ", log_stream
);
307 fputs("\n", log_stream
);
311 setbuf(log_stream
, NULL
);
315 // update a counter, accumulating 2^32 wraps
316 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
318 uint32_t new = *counter
+ delta
;
325 // initialise the random generator
326 static void initrandom(char *source
)
328 static char path
[sizeof(config
->random_device
)] = "*undefined*";
330 // reinitialise only if we are forced to do so or if the config has changed
331 if (source
&& !strncmp(path
, source
, sizeof(path
)))
334 // close previous source, if any
343 snprintf(path
, sizeof(path
), "%s", source
);
347 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
349 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
350 path
, strerror(errno
));
355 // fill buffer with random data
356 void random_data(uint8_t *buf
, int len
)
363 n
= read(rand_fd
, buf
, len
);
364 if (n
>= len
) return;
369 LOG(0, 0, 0, "Error reading from random source: %s\n",
372 // fall back to rand()
380 // append missing data
382 // not using the low order bits from the prng stream
383 buf
[n
++] = (rand() >> 4) & 0xff;
388 // This adds it to the routing table, advertises it
389 // via BGP if enabled, and stuffs it into the
390 // 'sessionbyip' cache.
392 // 'ip' and 'mask' must be in _host_ order.
394 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
399 if (!mask
) mask
= 0xffffffff;
401 ip
&= mask
; // Force the ip to be the first one in the route.
403 memset(&r
, 0, sizeof(r
));
404 r
.rt_dev
= config
->tundevice
;
405 r
.rt_dst
.sa_family
= AF_INET
;
406 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
407 r
.rt_gateway
.sa_family
= AF_INET
;
408 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
409 r
.rt_genmask
.sa_family
= AF_INET
;
410 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
411 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
413 r
.rt_flags
|= RTF_GATEWAY
;
414 else if (mask
== 0xffffffff)
415 r
.rt_flags
|= RTF_HOST
;
417 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
418 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
419 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
421 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
422 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
426 bgp_add_route(htonl(ip
), htonl(mask
));
428 bgp_del_route(htonl(ip
), htonl(mask
));
431 // Add/Remove the IPs to the 'sessionbyip' cache.
432 // Note that we add the zero address in the case of
433 // a network route. Roll on CIDR.
435 // Note that 's == 0' implies this is the address pool.
436 // We still cache it here, because it will pre-fill
437 // the malloc'ed tree.
441 if (!add
) // Are we deleting a route?
442 s
= 0; // Caching the session as '0' is the same as uncaching.
444 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
449 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
452 char ipv6addr
[INET6_ADDRSTRLEN
];
456 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
460 memset(&rt
, 0, sizeof(rt
));
462 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
463 rt
.rtmsg_dst_len
= prefixlen
;
465 rt
.rtmsg_flags
= RTF_UP
;
466 rt
.rtmsg_ifindex
= tunidx
;
468 LOG(1, 0, 0, "Route %s %s/%d\n",
470 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
473 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
474 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
477 // FIXME: need to add BGP routing (RFC2858)
481 if (!add
) // Are we deleting a route?
482 s
= 0; // Caching the session as '0' is the same as uncaching.
484 cache_ipv6map(ip
, prefixlen
, s
);
490 // defined in linux/ipv6.h, but tricky to include from user-space
491 // TODO: move routing to use netlink rather than ioctl
493 struct in6_addr ifr6_addr
;
494 __u32 ifr6_prefixlen
;
495 unsigned int ifr6_ifindex
;
499 // Set up TUN interface
500 static void inittun(void)
503 struct in6_ifreq ifr6
;
504 struct sockaddr_in sin
= {0};
505 memset(&ifr
, 0, sizeof(ifr
));
506 ifr
.ifr_flags
= IFF_TUN
;
508 tunfd
= open(TUNDEVICE
, O_RDWR
);
511 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
515 int flags
= fcntl(tunfd
, F_GETFL
, 0);
516 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
518 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
520 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
523 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
524 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
525 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
527 sin
.sin_family
= AF_INET
;
528 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
529 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
531 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
533 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
536 /* Bump up the qlen to deal with bursts from the network */
538 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
540 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
543 ifr
.ifr_flags
= IFF_UP
;
544 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
546 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
549 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
551 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
554 tunidx
= ifr
.ifr_ifindex
;
556 // Only setup IPv6 on the tun device if we have a configured prefix
557 if (config
->ipv6_prefix
.s6_addr
[0]) {
558 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
560 // Link local address is FE80::1
561 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
562 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
563 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
564 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
565 ifr6
.ifr6_prefixlen
= 64;
566 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
567 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
569 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
570 " %s\n", strerror(errno
));
573 // Global address is prefix::1
574 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
575 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
576 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
577 ifr6
.ifr6_prefixlen
= 64;
578 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
579 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
581 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
588 static void initudp(void)
591 struct sockaddr_in addr
;
594 memset(&addr
, 0, sizeof(addr
));
595 addr
.sin_family
= AF_INET
;
596 addr
.sin_port
= htons(L2TPPORT
);
597 addr
.sin_addr
.s_addr
= config
->bind_address
;
598 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
599 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
601 int flags
= fcntl(udpfd
, F_GETFL
, 0);
602 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
604 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
606 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
611 memset(&addr
, 0, sizeof(addr
));
612 addr
.sin_family
= AF_INET
;
613 addr
.sin_port
= htons(NSCTL_PORT
);
614 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
615 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
616 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
618 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
622 // Dynamic Authorization Extensions to RADIUS
623 memset(&addr
, 0, sizeof(addr
));
624 addr
.sin_family
= AF_INET
;
625 addr
.sin_port
= htons(config
->radius_dae_port
);
626 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
627 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
628 if (bind(daefd
, (void *) &addr
, sizeof(addr
)) < 0)
630 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
635 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
639 // Find session by IP, < 1 for not found
641 // Confusingly enough, this 'ip' must be
642 // in _network_ order. This being the common
643 // case when looking it up from IP packet headers.
645 // We actually use this cache for two things.
646 // #1. For used IP addresses, this maps to the
647 // session ID that it's used by.
648 // #2. For un-used IP addresses, this maps to the
649 // index into the pool table that contains that
653 static int lookup_ipmap(in_addr_t ip
)
655 uint8_t *a
= (uint8_t *) &ip
;
656 uint8_t **d
= (uint8_t **) ip_hash
;
658 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
659 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
660 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
662 return (int) (intptr_t) d
[(size_t) *a
];
665 static int lookup_ipv6map(struct in6_addr ip
)
667 struct ipv6radix
*curnode
;
670 char ipv6addr
[INET6_ADDRSTRLEN
];
672 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
676 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
678 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
683 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
684 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
691 sessionidt
sessionbyip(in_addr_t ip
)
693 int s
= lookup_ipmap(ip
);
696 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
697 return (sessionidt
) s
;
702 sessionidt
sessionbyipv6(struct in6_addr ip
)
705 CSTAT(sessionbyipv6
);
707 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
708 (ip
.s6_addr
[0] == 0xFE &&
709 ip
.s6_addr
[1] == 0x80 &&
710 ip
.s6_addr16
[1] == 0 &&
711 ip
.s6_addr16
[2] == 0 &&
712 ip
.s6_addr16
[3] == 0)) {
713 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
715 s
= lookup_ipv6map(ip
);
718 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
725 // Take an IP address in HOST byte order and
726 // add it to the sessionid by IP cache.
728 // (It's actually cached in network order)
730 static void cache_ipmap(in_addr_t ip
, int s
)
732 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
733 uint8_t *a
= (uint8_t *) &nip
;
734 uint8_t **d
= (uint8_t **) ip_hash
;
737 for (i
= 0; i
< 3; i
++)
739 if (!d
[(size_t) a
[i
]])
741 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
745 d
= (uint8_t **) d
[(size_t) a
[i
]];
748 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
751 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
754 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
755 // else a map to an ip pool index.
758 static void uncache_ipmap(in_addr_t ip
)
760 cache_ipmap(ip
, 0); // Assign it to the NULL session.
763 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
767 struct ipv6radix
*curnode
;
768 char ipv6addr
[INET6_ADDRSTRLEN
];
770 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
772 bytes
= prefixlen
>> 3;
775 if (curnode
->branch
== NULL
)
777 if (!(curnode
->branch
= calloc(256,
778 sizeof (struct ipv6radix
))))
781 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
788 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
789 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
793 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
794 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
800 // CLI list to dump current ipcache.
802 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
804 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
808 if (CLI_HELP_REQUESTED
)
809 return CLI_HELP_NO_ARGS
;
811 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
813 for (i
= 0; i
< 256; ++i
)
818 for (j
= 0; j
< 256; ++j
)
823 for (k
= 0; k
< 256; ++k
)
828 for (l
= 0; l
< 256; ++l
)
832 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
838 cli_print(cli
, "%d entries in cache", count
);
843 // Find session by username, 0 for not found
844 // walled garden users aren't authenticated, so the username is
845 // reasonably useless. Ignore them to avoid incorrect actions
847 // This is VERY inefficent. Don't call it often. :)
849 sessionidt
sessionbyuser(char *username
)
852 CSTAT(sessionbyuser
);
854 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
856 if (!session
[s
].opened
)
859 if (session
[s
].walled_garden
)
860 continue; // Skip walled garden users.
862 if (!strncmp(session
[s
].user
, username
, 128))
866 return 0; // Not found.
869 void send_garp(in_addr_t ip
)
875 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
878 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
881 memset(&ifr
, 0, sizeof(ifr
));
882 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
883 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
885 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
889 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
890 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
892 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
897 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
900 static sessiont
*sessiontbysessionidt(sessionidt s
)
902 if (!s
|| s
>= MAXSESSION
) return NULL
;
906 static sessionidt
sessionidtbysessiont(sessiont
*s
)
908 sessionidt val
= s
-session
;
909 if (s
< session
|| val
>= MAXSESSION
) return 0;
913 // actually send a control message for a specific tunnel
914 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
916 struct sockaddr_in addr
;
922 static int backtrace_count
= 0;
923 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
924 STAT(tunnel_tx_errors
);
925 log_backtrace(backtrace_count
, 5)
931 static int backtrace_count
= 0;
932 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
933 log_backtrace(backtrace_count
, 5)
934 STAT(tunnel_tx_errors
);
938 memset(&addr
, 0, sizeof(addr
));
939 addr
.sin_family
= AF_INET
;
940 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
941 addr
.sin_port
= htons(tunnel
[t
].port
);
943 // sequence expected, if sequence in message
944 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
946 // If this is a control message, deal with retries
949 tunnel
[t
].last
= time_now
; // control message sent
950 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
951 if (tunnel
[t
].try > 1)
953 STAT(tunnel_retries
);
954 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
958 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
960 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
961 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
962 STAT(tunnel_tx_errors
);
966 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
967 STAT(tunnel_tx_packets
);
968 INC_STAT(tunnel_tx_bytes
, l
);
972 // Tiny helper function to write data to
975 int tun_write(uint8_t * data
, int size
)
977 return write(tunfd
, data
, size
);
980 // process outgoing (to tunnel) IP
982 static void processipout(uint8_t *buf
, int len
)
989 uint8_t *data
= buf
; // Keep a copy of the originals.
992 uint8_t b
[MAXETHER
+ 20];
996 if (len
< MIN_IP_SIZE
)
998 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1002 if (len
>= MAXETHER
)
1004 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1005 STAT(tun_rx_errors
);
1009 // Skip the tun header
1013 // Got an IP header now
1014 if (*(uint8_t *)(buf
) >> 4 != 4)
1016 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1020 ip
= *(uint32_t *)(buf
+ 16);
1021 if (!(s
= sessionbyip(ip
)))
1023 // Is this a packet for a session that doesn't exist?
1024 static int rate
= 0; // Number of ICMP packets we've sent this second.
1025 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1027 if (last
!= time_now
)
1033 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1035 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1036 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1037 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1041 t
= session
[s
].tunnel
;
1044 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1045 if (config
->max_packets
> 0)
1047 if (sess_local
[s
].last_packet_out
== TIME
)
1049 int max
= config
->max_packets
;
1051 // All packets for throttled sessions are handled by the
1052 // master, so further limit by using the throttle rate.
1053 // A bit of a kludge, since throttle rate is in kbps,
1054 // but should still be generous given our average DSL
1055 // packet size is 200 bytes: a limit of 28kbps equates
1056 // to around 180 packets per second.
1057 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1058 max
= sp
->throttle_out
;
1060 if (++sess_local
[s
].packets_out
> max
)
1062 sess_local
[s
].packets_dropped
++;
1068 if (sess_local
[s
].packets_dropped
)
1070 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1071 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1072 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1073 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1077 sess_local
[s
].last_packet_out
= TIME
;
1078 sess_local
[s
].packets_out
= 1;
1079 sess_local
[s
].packets_dropped
= 0;
1083 // run access-list if any
1084 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1089 // Are we throttling this session?
1090 if (config
->cluster_iam_master
)
1091 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1093 master_throttle_packet(sp
->tbf_out
, data
, size
);
1096 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1098 // We are walled-gardening this
1099 master_garden_packet(s
, data
, size
);
1103 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1105 // Add on L2TP header
1107 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
);
1109 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1112 // Snooping this session, send it to intercept box
1113 if (sp
->snoop_ip
&& sp
->snoop_port
)
1114 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1116 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1117 sp
->cout_delta
+= len
;
1121 sess_local
[s
].cout
+= len
; // To send to master..
1122 sess_local
[s
].pout
++;
1125 // process outgoing (to tunnel) IPv6
1127 static void processipv6out(uint8_t * buf
, int len
)
1133 struct in6_addr ip6
;
1135 uint8_t *data
= buf
; // Keep a copy of the originals.
1138 uint8_t b
[MAXETHER
+ 20];
1140 CSTAT(processipv6out
);
1142 if (len
< MIN_IP_SIZE
)
1144 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1145 STAT(tunnel_tx_errors
);
1148 if (len
>= MAXETHER
)
1150 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1151 STAT(tunnel_tx_errors
);
1155 // Skip the tun header
1159 // Got an IP header now
1160 if (*(uint8_t *)(buf
) >> 4 != 6)
1162 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1166 ip6
= *(struct in6_addr
*)(buf
+24);
1167 s
= sessionbyipv6(ip6
);
1171 ip
= *(uint32_t *)(buf
+ 32);
1172 s
= sessionbyip(ip
);
1177 // Is this a packet for a session that doesn't exist?
1178 static int rate
= 0; // Number of ICMP packets we've sent this second.
1179 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1181 if (last
!= time_now
)
1187 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1189 // FIXME: Should send icmp6 host unreachable
1193 t
= session
[s
].tunnel
;
1196 // FIXME: add DoS prevention/filters?
1200 // Are we throttling this session?
1201 if (config
->cluster_iam_master
)
1202 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1204 master_throttle_packet(sp
->tbf_out
, data
, size
);
1207 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1209 // We are walled-gardening this
1210 master_garden_packet(s
, data
, size
);
1214 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1216 // Add on L2TP header
1218 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
);
1220 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1223 // Snooping this session, send it to intercept box
1224 if (sp
->snoop_ip
&& sp
->snoop_port
)
1225 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1227 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1228 sp
->cout_delta
+= len
;
1232 sess_local
[s
].cout
+= len
; // To send to master..
1233 sess_local
[s
].pout
++;
1237 // Helper routine for the TBF filters.
1238 // Used to send queued data in to the user!
1240 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1246 uint8_t b
[MAXETHER
+ 20];
1248 if (len
< 0 || len
> MAXETHER
)
1250 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1254 // Skip the tun header
1258 ip
= *(in_addr_t
*)(buf
+ 16);
1263 t
= session
[s
].tunnel
;
1266 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1268 // Add on L2TP header
1270 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
);
1272 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1275 // Snooping this session.
1276 if (sp
->snoop_ip
&& sp
->snoop_port
)
1277 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1279 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1280 sp
->cout_delta
+= len
;
1284 sess_local
[s
].cout
+= len
; // To send to master..
1285 sess_local
[s
].pout
++;
1288 // add an AVP (16 bit)
1289 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1291 uint16_t l
= (m
? 0x8008 : 0x0008);
1292 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1293 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1294 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1295 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1299 // add an AVP (32 bit)
1300 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1302 uint16_t l
= (m
? 0x800A : 0x000A);
1303 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1304 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1305 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1306 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1310 // add an AVP (string)
1311 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1313 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1314 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1315 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1316 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1317 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1318 c
->length
+= 6 + strlen(val
);
1322 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1324 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1325 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1326 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1327 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1328 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1329 c
->length
+= 6 + len
;
1332 // new control connection
1333 static controlt
*controlnew(uint16_t mtype
)
1337 c
= malloc(sizeof(controlt
));
1341 controlfree
= c
->next
;
1345 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1347 control16(c
, 0, mtype
, 1);
1351 // send zero block if nothing is waiting
1353 static void controlnull(tunnelidt t
)
1356 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1359 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1360 *(uint16_t *) (buf
+ 2) = htons(12); // length
1361 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1362 *(uint16_t *) (buf
+ 6) = htons(0); // session
1363 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1364 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1365 tunnelsend(buf
, 12, t
);
1368 // add a control message to a tunnel, and send if within window
1369 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1371 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1372 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1373 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1374 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1375 tunnel
[t
].ns
++; // advance sequence
1376 // link in message in to queue
1377 if (tunnel
[t
].controlc
)
1378 tunnel
[t
].controle
->next
= c
;
1380 tunnel
[t
].controls
= c
;
1382 tunnel
[t
].controle
= c
;
1383 tunnel
[t
].controlc
++;
1385 // send now if space in window
1386 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1388 tunnel
[t
].try = 0; // first send
1389 tunnelsend(c
->buf
, c
->length
, t
);
1394 // Throttle or Unthrottle a session
1396 // Throttle the data from/to through a session to no more than
1397 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1400 // If either value is -1, the current value is retained for that
1403 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1405 if (!session
[s
].opened
)
1406 return; // No-one home.
1408 if (!*session
[s
].user
)
1409 return; // User not logged in
1413 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1414 if (session
[s
].tbf_in
)
1415 free_tbf(session
[s
].tbf_in
);
1418 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1420 session
[s
].tbf_in
= 0;
1422 session
[s
].throttle_in
= rate_in
;
1427 int bytes
= rate_out
* 1024 / 8;
1428 if (session
[s
].tbf_out
)
1429 free_tbf(session
[s
].tbf_out
);
1432 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1434 session
[s
].tbf_out
= 0;
1436 session
[s
].throttle_out
= rate_out
;
1440 // add/remove filters from session (-1 = no change)
1441 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1443 if (!session
[s
].opened
)
1444 return; // No-one home.
1446 if (!*session
[s
].user
)
1447 return; // User not logged in
1450 if (filter_in
> MAXFILTER
) filter_in
= -1;
1451 if (filter_out
> MAXFILTER
) filter_out
= -1;
1452 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1453 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1457 if (session
[s
].filter_in
)
1458 ip_filters
[session
[s
].filter_in
- 1].used
--;
1461 ip_filters
[filter_in
- 1].used
++;
1463 session
[s
].filter_in
= filter_in
;
1466 if (filter_out
>= 0)
1468 if (session
[s
].filter_out
)
1469 ip_filters
[session
[s
].filter_out
- 1].used
--;
1472 ip_filters
[filter_out
- 1].used
++;
1474 session
[s
].filter_out
= filter_out
;
1478 // start tidy shutdown of session
1479 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1481 int walled_garden
= session
[s
].walled_garden
;
1484 CSTAT(sessionshutdown
);
1486 if (!session
[s
].opened
)
1488 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1489 return; // not a live session
1492 if (!session
[s
].die
)
1494 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1495 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1496 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1499 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1501 // RADIUS Stop message
1502 uint16_t r
= radiusnew(s
);
1505 // stop, if not already trying
1506 if (radius
[r
].state
!= RADIUSSTOP
)
1507 radiussend(r
, RADIUSSTOP
);
1510 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1512 // Save counters to dump to accounting file
1513 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1514 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1518 { // IP allocated, clear and unroute
1521 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1523 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1524 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1527 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1528 session
[s
].route
[r
].ip
= 0;
1531 if (session
[s
].ip_pool_index
== -1) // static ip
1533 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1539 // unroute IPv6, if setup
1540 if (session
[s
].ppp
.ipv6cp
== Opened
&& session
[s
].ipv6prefixlen
)
1541 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1544 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1545 throttle_session(s
, 0, 0);
1549 controlt
*c
= controlnew(14); // sending CDN
1553 *(uint16_t *) buf
= htons(result
);
1554 *(uint16_t *) (buf
+2) = htons(error
);
1555 controlb(c
, 1, buf
, 4, 1);
1558 control16(c
, 1, result
, 1);
1560 control16(c
, 14, s
, 1); // assigned session (our end)
1561 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
1564 if (!session
[s
].die
)
1565 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1567 // update filter refcounts
1568 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1569 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1572 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
1573 sess_local
[s
].lcp
.restart
= 0;
1574 sess_local
[s
].ipcp
.restart
= 0;
1575 sess_local
[s
].ipv6cp
.restart
= 0;
1576 sess_local
[s
].ccp
.restart
= 0;
1578 cluster_send_session(s
);
1581 void sendipcp(sessionidt s
, tunnelidt t
)
1583 uint8_t buf
[MAXCONTROL
];
1588 if (!session
[s
].unique_id
)
1590 if (!++last_id
) ++last_id
; // skip zero
1591 session
[s
].unique_id
= last_id
;
1594 q
= makeppp(buf
,sizeof(buf
), 0, 0, s
, t
, PPPIPCP
);
1598 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
1599 *(uint16_t *) (q
+ 2) = htons(10); // packet length
1600 q
[4] = 3; // ip address option
1601 q
[5] = 6; // option length
1602 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1603 config
->bind_address
? config
->bind_address
:
1604 my_address
; // send my IP
1606 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1609 void sendipv6cp(sessionidt s
, tunnelidt t
)
1611 uint8_t buf
[MAXCONTROL
];
1616 q
= makeppp(buf
,sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
);
1620 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
1621 // only send one type
1623 *(uint16_t *) (q
+ 2) = htons(14);
1624 q
[4] = 1; // interface identifier option
1625 q
[5] = 10; // option length
1626 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1627 *(uint32_t *) (q
+ 10) = 0;
1630 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1633 static void sessionclear(sessionidt s
)
1635 memset(&session
[s
], 0, sizeof(session
[s
]));
1636 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1637 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1639 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1640 session
[s
].next
= sessionfree
;
1644 // kill a session now
1645 void sessionkill(sessionidt s
, char *reason
)
1650 if (!session
[s
].opened
) // not alive
1653 if (session
[s
].next
)
1655 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1659 session
[s
].die
= TIME
;
1660 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1661 if (sess_local
[s
].radius
)
1662 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1664 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1666 cluster_send_session(s
);
1669 static void tunnelclear(tunnelidt t
)
1672 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1673 tunnel
[t
].state
= TUNNELFREE
;
1676 // kill a tunnel now
1677 static void tunnelkill(tunnelidt t
, char *reason
)
1684 tunnel
[t
].state
= TUNNELDIE
;
1686 // free control messages
1687 while ((c
= tunnel
[t
].controls
))
1689 controlt
* n
= c
->next
;
1690 tunnel
[t
].controls
= n
;
1691 tunnel
[t
].controlc
--;
1692 c
->next
= controlfree
;
1696 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1697 if (session
[s
].tunnel
== t
)
1698 sessionkill(s
, reason
);
1702 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1703 cli_tunnel_actions
[t
].action
= 0;
1704 cluster_send_tunnel(t
);
1707 // shut down a tunnel cleanly
1708 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1712 CSTAT(tunnelshutdown
);
1714 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1716 // never set up, can immediately kill
1717 tunnelkill(t
, reason
);
1720 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1723 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1724 if (session
[s
].tunnel
== t
)
1725 sessionshutdown(s
, reason
, 0, 0);
1727 tunnel
[t
].state
= TUNNELDIE
;
1728 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1729 cluster_send_tunnel(t
);
1730 // TBA - should we wait for sessions to stop?
1733 controlt
*c
= controlnew(4); // sending StopCCN
1738 *(uint16_t *) buf
= htons(result
);
1739 *(uint16_t *) (buf
+2) = htons(error
);
1742 int m
= strlen(msg
);
1743 if (m
+ 4 > sizeof(buf
))
1744 m
= sizeof(buf
) - 4;
1746 memcpy(buf
+4, msg
, m
);
1750 controlb(c
, 1, buf
, l
, 1);
1753 control16(c
, 1, result
, 1);
1755 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1756 controladd(c
, 0, t
); // send the message
1760 // read and process packet on tunnel (UDP)
1761 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
1763 uint8_t *chapresponse
= NULL
;
1764 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1765 uint8_t *p
= buf
+ 2;
1772 LOG_HEX(5, "UDP Data", buf
, len
);
1773 STAT(tunnel_rx_packets
);
1774 INC_STAT(tunnel_rx_bytes
, len
);
1777 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1778 STAT(tunnel_rx_errors
);
1781 if ((buf
[1] & 0x0F) != 2)
1783 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1784 STAT(tunnel_rx_errors
);
1789 l
= ntohs(*(uint16_t *) p
);
1792 t
= ntohs(*(uint16_t *) p
);
1794 s
= ntohs(*(uint16_t *) p
);
1796 if (s
>= MAXSESSION
)
1798 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1799 STAT(tunnel_rx_errors
);
1804 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1805 STAT(tunnel_rx_errors
);
1810 ns
= ntohs(*(uint16_t *) p
);
1812 nr
= ntohs(*(uint16_t *) p
);
1817 uint16_t o
= ntohs(*(uint16_t *) p
);
1822 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1823 STAT(tunnel_rx_errors
);
1829 uint16_t message
= 0xFFFF; // message type
1831 uint8_t mandatory
= 0;
1832 uint16_t asession
= 0; // assigned session
1833 uint32_t amagic
= 0; // magic number
1834 uint8_t aflags
= 0; // flags from last LCF
1835 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1836 char called
[MAXTEL
] = ""; // called number
1837 char calling
[MAXTEL
] = ""; // calling number
1839 if (!config
->cluster_iam_master
)
1841 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1845 // control messages must have bits 0x80|0x40|0x08
1846 // (type, length and sequence) set, and bits 0x02|0x01
1847 // (offset and priority) clear
1848 if ((*buf
& 0xCB) != 0xC8)
1850 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1851 STAT(tunnel_rx_errors
);
1855 // check for duplicate tunnel open message
1861 // Is this a duplicate of the first packet? (SCCRQ)
1863 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1865 if (tunnel
[i
].state
!= TUNNELOPENING
||
1866 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1867 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1870 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1875 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1876 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1878 // if no tunnel specified, assign one
1881 if (!(t
= new_tunnel()))
1883 LOG(1, 0, 0, "No more tunnels\n");
1884 STAT(tunnel_overflow
);
1888 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1889 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1890 tunnel
[t
].window
= 4; // default window
1891 STAT(tunnel_created
);
1892 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1893 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1896 // If the 'ns' just received is not the 'nr' we're
1897 // expecting, just send an ack and drop it.
1899 // if 'ns' is less, then we got a retransmitted packet.
1900 // if 'ns' is greater than missed a packet. Either way
1901 // we should ignore it.
1902 if (ns
!= tunnel
[t
].nr
)
1904 // is this the sequence we were expecting?
1905 STAT(tunnel_rx_errors
);
1906 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1907 t
, ns
, tunnel
[t
].nr
);
1909 if (l
) // Is this not a ZLB?
1914 // This is used to time out old tunnels
1915 tunnel
[t
].lastrec
= time_now
;
1917 // check sequence of this message
1919 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1920 // some to clear maybe?
1921 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1923 controlt
*c
= tunnel
[t
].controls
;
1924 tunnel
[t
].controls
= c
->next
;
1925 tunnel
[t
].controlc
--;
1926 c
->next
= controlfree
;
1929 tunnel
[t
].try = 0; // we have progress
1932 // receiver advance (do here so quoted correctly in any sends below)
1933 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1934 if (skip
< 0) skip
= 0;
1935 if (skip
< tunnel
[t
].controlc
)
1937 // some control packets can now be sent that were previous stuck out of window
1938 int tosend
= tunnel
[t
].window
- skip
;
1939 controlt
*c
= tunnel
[t
].controls
;
1947 tunnel
[t
].try = 0; // first send
1948 tunnelsend(c
->buf
, c
->length
, t
);
1953 if (!tunnel
[t
].controlc
)
1954 tunnel
[t
].retry
= 0; // caught up
1957 { // if not a null message
1963 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1965 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1971 LOG(1, s
, t
, "Invalid length in AVP\n");
1972 STAT(tunnel_rx_errors
);
1977 if (flags
& 0x3C) // reserved bits, should be clear
1979 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1981 result
= 2; // general error
1982 error
= 3; // reserved field non-zero
1987 if (*(uint16_t *) (b
))
1989 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1991 result
= 2; // general error
1992 error
= 6; // generic vendor-specific error
1993 msg
= "unsupported vendor-specific";
1997 mtype
= ntohs(*(uint16_t *) (b
));
2005 // handle hidden AVPs
2006 if (!*config
->l2tpsecret
)
2008 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2010 result
= 2; // general error
2011 error
= 6; // generic vendor-specific error
2012 msg
= "secret not specified";
2015 if (!session
[s
].random_vector_length
)
2017 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2019 result
= 2; // general error
2020 error
= 6; // generic
2021 msg
= "no random vector";
2026 LOG(2, s
, t
, "Short hidden AVP.\n");
2028 result
= 2; // general error
2029 error
= 2; // length is wrong
2035 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2037 orig_len
= ntohs(*(uint16_t *) b
);
2038 if (orig_len
> n
+ 2)
2040 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2044 result
= 2; // general error
2045 error
= 2; // length is wrong
2054 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2055 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2059 case 0: // message type
2060 message
= ntohs(*(uint16_t *) b
);
2061 mandatory
= flags
& 0x80;
2062 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_code(message
));
2064 case 1: // result code
2066 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2067 const char* resdesc
= "(unknown)";
2070 resdesc
= l2tp_stopccn_result_code(rescode
);
2072 else if (message
== 14)
2074 resdesc
= l2tp_cdn_result_code(rescode
);
2077 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2080 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2081 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, l2tp_error_code(errcode
));
2084 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2089 case 2: // protocol version
2091 version
= ntohs(*(uint16_t *) (b
));
2092 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2093 if (version
&& version
!= 0x0100)
2094 { // allow 0.0 and 1.0
2095 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2097 result
= 5; // unspported protocol version
2098 error
= 0x0100; // supported version
2104 case 3: // framing capabilities
2105 // LOG(4, s, t, "Framing capabilities\n");
2107 case 4: // bearer capabilities
2108 // LOG(4, s, t, "Bearer capabilities\n");
2110 case 5: // tie breaker
2111 // We never open tunnels, so we don't care about tie breakers
2112 // LOG(4, s, t, "Tie breaker\n");
2114 case 6: // firmware revision
2115 // LOG(4, s, t, "Firmware revision\n");
2117 case 7: // host name
2118 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2119 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2120 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2121 // TBA - to send to RADIUS
2123 case 8: // vendor name
2124 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2125 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2126 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2128 case 9: // assigned tunnel
2129 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2130 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2132 case 10: // rx window
2133 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2134 if (!tunnel
[t
].window
)
2135 tunnel
[t
].window
= 1; // window of 0 is silly
2136 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2138 case 11: // Challenge
2140 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2141 build_chap_response(b
, 2, n
, &chapresponse
);
2144 case 13: // Response
2145 // Why did they send a response? We never challenge.
2146 LOG(2, s
, t
, " received unexpected challenge response\n");
2149 case 14: // assigned session
2150 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2151 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2153 case 15: // call serial number
2154 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2156 case 18: // bearer type
2157 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2160 case 19: // framing type
2161 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2164 case 21: // called number
2165 memset(called
, 0, sizeof(called
));
2166 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2167 LOG(4, s
, t
, " Called <%s>\n", called
);
2169 case 22: // calling number
2170 memset(calling
, 0, sizeof(calling
));
2171 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2172 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2176 case 24: // tx connect speed
2179 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2183 // AS5300s send connect speed as a string
2185 memset(tmp
, 0, sizeof(tmp
));
2186 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2187 session
[s
].tx_connect_speed
= atol(tmp
);
2189 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2191 case 38: // rx connect speed
2194 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2198 // AS5300s send connect speed as a string
2200 memset(tmp
, 0, sizeof(tmp
));
2201 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2202 session
[s
].rx_connect_speed
= atol(tmp
);
2204 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2206 case 25: // Physical Channel ID
2208 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2209 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2212 case 29: // Proxy Authentication Type
2214 uint16_t atype
= ntohs(*(uint16_t *)b
);
2215 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, ppp_auth_type(atype
));
2218 case 30: // Proxy Authentication Name
2221 memset(authname
, 0, sizeof(authname
));
2222 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2223 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2227 case 31: // Proxy Authentication Challenge
2229 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2232 case 32: // Proxy Authentication ID
2234 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2235 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2238 case 33: // Proxy Authentication Response
2239 LOG(4, s
, t
, " Proxy Auth Response\n");
2241 case 27: // last sent lcp
2242 { // find magic number
2243 uint8_t *p
= b
, *e
= p
+ n
;
2244 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2246 if (*p
== 5 && p
[1] == 6) // Magic-Number
2247 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2248 else if (*p
== 7) // Protocol-Field-Compression
2249 aflags
|= SESSIONPFC
;
2250 else if (*p
== 8) // Address-and-Control-Field-Compression
2251 aflags
|= SESSIONACFC
;
2256 case 28: // last recv lcp confreq
2258 case 26: // Initial Received LCP CONFREQ
2260 case 39: // seq required - we control it as an LNS anyway...
2262 case 36: // Random Vector
2263 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2264 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2265 if (n
> sizeof(session
[s
].random_vector
))
2266 n
= sizeof(session
[s
].random_vector
);
2267 memcpy(session
[s
].random_vector
, b
, n
);
2268 session
[s
].random_vector_length
= n
;
2272 static char e
[] = "unknown AVP 0xXXXX";
2273 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2275 result
= 2; // general error
2276 error
= 8; // unknown mandatory AVP
2277 sprintf((msg
= e
) + 14, "%04x", mtype
);
2284 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2288 case 1: // SCCRQ - Start Control Connection Request
2289 tunnel
[t
].state
= TUNNELOPENING
;
2290 if (main_quit
!= QUIT_SHUTDOWN
)
2292 controlt
*c
= controlnew(2); // sending SCCRP
2293 control16(c
, 2, version
, 1); // protocol version
2294 control32(c
, 3, 3, 1); // framing
2295 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2296 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2297 control16(c
, 9, t
, 1); // assigned tunnel
2298 controladd(c
, 0, t
); // send the resply
2302 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2306 tunnel
[t
].state
= TUNNELOPEN
;
2309 tunnel
[t
].state
= TUNNELOPEN
;
2310 controlnull(t
); // ack
2313 controlnull(t
); // ack
2314 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2317 controlnull(t
); // simply ACK
2329 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2331 controlt
*c
= controlnew(11); // ICRP
2334 sessionfree
= session
[s
].next
;
2335 memset(&session
[s
], 0, sizeof(session
[s
]));
2337 if (s
> config
->cluster_highest_sessionid
)
2338 config
->cluster_highest_sessionid
= s
;
2340 session
[s
].opened
= time_now
;
2341 session
[s
].tunnel
= t
;
2342 session
[s
].far
= asession
;
2343 session
[s
].last_packet
= time_now
;
2344 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2345 control16(c
, 14, s
, 1); // assigned session
2346 controladd(c
, asession
, t
); // send the reply
2348 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2349 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2351 session
[s
].ppp
.phase
= Establish
;
2352 session
[s
].ppp
.lcp
= Starting
;
2354 STAT(session_created
);
2359 controlt
*c
= controlnew(14); // CDN
2362 STAT(session_overflow
);
2363 LOG(1, 0, t
, "No free sessions\n");
2364 control16(c
, 1, 4, 0); // temporary lack of resources
2367 control16(c
, 1, 2, 7); // shutting down, try another
2369 controladd(c
, asession
, t
); // send the message
2376 if (amagic
== 0) amagic
= time_now
;
2377 session
[s
].magic
= amagic
; // set magic number
2378 session
[s
].l2tp_flags
= aflags
; // set flags received
2379 controlnull(t
); // ack
2382 sendlcp(s
, t
, config
->radius_authprefer
);
2383 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2384 sess_local
[s
].lcp
.conf_sent
= 1;
2385 sess_local
[s
].lcp
.nak_sent
= 0;
2386 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
2387 session
[s
].ppp
.lcp
= RequestSent
;
2391 controlnull(t
); // ack
2392 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2395 LOG(1, s
, t
, "Missing message type\n");
2398 STAT(tunnel_rx_errors
);
2400 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2402 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2405 if (chapresponse
) free(chapresponse
);
2406 cluster_send_tunnel(t
);
2410 LOG(4, s
, t
, " Got a ZLB ack\n");
2417 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2418 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2419 { // HDLC address header, discard
2425 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2426 STAT(tunnel_rx_errors
);
2436 prot
= ntohs(*(uint16_t *) p
);
2441 if (s
&& !session
[s
].opened
) // Is something wrong??
2443 if (!config
->cluster_iam_master
)
2445 // Pass it off to the master to deal with..
2446 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2451 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2452 STAT(tunnel_rx_errors
);
2458 session
[s
].last_packet
= time_now
;
2459 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2460 processpap(s
, t
, p
, l
);
2462 else if (prot
== PPPCHAP
)
2464 session
[s
].last_packet
= time_now
;
2465 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2466 processchap(s
, t
, p
, l
);
2468 else if (prot
== PPPLCP
)
2470 session
[s
].last_packet
= time_now
;
2471 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2472 processlcp(s
, t
, p
, l
);
2474 else if (prot
== PPPIPCP
)
2476 session
[s
].last_packet
= time_now
;
2477 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2478 processipcp(s
, t
, p
, l
);
2480 else if (prot
== PPPIPV6CP
)
2482 session
[s
].last_packet
= time_now
;
2483 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2484 processipv6cp(s
, t
, p
, l
);
2486 else if (prot
== PPPCCP
)
2488 session
[s
].last_packet
= time_now
;
2489 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2490 processccp(s
, t
, p
, l
);
2492 else if (prot
== PPPIP
)
2496 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2497 return; // closing session, PPP not processed
2500 session
[s
].last_packet
= time_now
;
2501 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2503 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2507 processipin(s
, t
, p
, l
);
2509 else if (prot
== PPPIPV6
)
2511 if (!config
->ipv6_prefix
.s6_addr
[0])
2513 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2518 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2519 return; // closing session, PPP not processed
2522 session
[s
].last_packet
= time_now
;
2523 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2525 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2529 processipv6in(s
, t
, p
, l
);
2533 STAT(tunnel_rx_errors
);
2534 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2539 // read and process packet on tun
2540 static void processtun(uint8_t * buf
, int len
)
2542 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2543 STAT(tun_rx_packets
);
2544 INC_STAT(tun_rx_bytes
, len
);
2552 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2553 STAT(tun_rx_errors
);
2557 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2558 processipout(buf
, len
);
2559 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2560 && config
->ipv6_prefix
.s6_addr
[0])
2561 processipv6out(buf
, len
);
2566 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2567 // that we look at the whole of the tunnel, radius and session tables
2569 static void regular_cleanups(double period
)
2571 // Next tunnel, radius and session to check for actions on.
2572 static tunnelidt t
= 0;
2574 static sessionidt s
= 0;
2587 // divide up tables into slices based on the last run
2588 t_slice
= config
->cluster_highest_tunnelid
* period
;
2589 r_slice
= (MAXRADIUS
- 1) * period
;
2590 s_slice
= config
->cluster_highest_sessionid
* period
;
2594 else if (t_slice
> config
->cluster_highest_tunnelid
)
2595 t_slice
= config
->cluster_highest_tunnelid
;
2599 else if (r_slice
> (MAXRADIUS
- 1))
2600 r_slice
= MAXRADIUS
- 1;
2604 else if (s_slice
> config
->cluster_highest_sessionid
)
2605 s_slice
= config
->cluster_highest_sessionid
;
2607 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2609 for (i
= 0; i
< t_slice
; i
++)
2612 if (t
> config
->cluster_highest_tunnelid
)
2615 // check for expired tunnels
2616 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2618 STAT(tunnel_timeout
);
2619 tunnelkill(t
, "Expired");
2623 // check for message resend
2624 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2626 // resend pending messages as timeout on reply
2627 if (tunnel
[t
].retry
<= TIME
)
2629 controlt
*c
= tunnel
[t
].controls
;
2630 uint8_t w
= tunnel
[t
].window
;
2631 tunnel
[t
].try++; // another try
2632 if (tunnel
[t
].try > 5)
2633 tunnelkill(t
, "Timeout on control message"); // game over
2637 tunnelsend(c
->buf
, c
->length
, t
);
2645 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2647 controlt
*c
= controlnew(6); // sending HELLO
2648 controladd(c
, 0, t
); // send the message
2649 LOG(3, 0, t
, "Sending HELLO message\n");
2653 // Check for tunnel changes requested from the CLI
2654 if ((a
= cli_tunnel_actions
[t
].action
))
2656 cli_tunnel_actions
[t
].action
= 0;
2657 if (a
& CLI_TUN_KILL
)
2659 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2660 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2666 for (i
= 0; i
< r_slice
; i
++)
2672 if (!radius
[r
].state
)
2675 if (radius
[r
].retry
<= TIME
)
2682 for (i
= 0; i
< s_slice
; i
++)
2685 if (s
> config
->cluster_highest_sessionid
)
2688 if (!session
[s
].opened
) // Session isn't in use
2691 // check for expired sessions
2694 if (session
[s
].die
<= TIME
)
2696 sessionkill(s
, "Expired");
2703 if (sess_local
[s
].lcp
.restart
<= time_now
)
2705 int next_state
= session
[s
].ppp
.lcp
;
2706 switch (session
[s
].ppp
.lcp
)
2710 next_state
= RequestSent
;
2713 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
2715 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
2716 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2717 sess_local
[s
].lcp
.conf_sent
++;
2718 sendlcp(s
, t
, sess_local
[s
].lcp_authtype
);
2719 change_state(s
, lcp
, next_state
);
2723 sessionshutdown(s
, "No response to LCP ConfigReq.", 3, 0);
2724 STAT(session_timeout
);
2734 if (sess_local
[s
].ipcp
.restart
<= time_now
)
2736 int next_state
= session
[s
].ppp
.ipcp
;
2737 switch (session
[s
].ppp
.ipcp
)
2741 next_state
= RequestSent
;
2744 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
2746 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
2747 sess_local
[s
].ipcp
.restart
= time_now
+ config
->ppp_restart_time
;
2748 sess_local
[s
].ipcp
.conf_sent
++;
2750 change_state(s
, ipcp
, next_state
);
2754 sessionshutdown(s
, "No response to IPCP ConfigReq.", 3, 0);
2755 STAT(session_timeout
);
2765 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
2767 int next_state
= session
[s
].ppp
.ipv6cp
;
2768 switch (session
[s
].ppp
.ipv6cp
)
2772 next_state
= RequestSent
;
2775 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
2777 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
2778 sess_local
[s
].ipv6cp
.restart
= time_now
+ config
->ppp_restart_time
;
2779 sess_local
[s
].ipv6cp
.conf_sent
++;
2781 change_state(s
, ipv6cp
, next_state
);
2785 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
2786 change_state(s
, ipv6cp
, Stopped
);
2793 if (sess_local
[s
].ccp
.restart
<= time_now
)
2795 int next_state
= session
[s
].ppp
.ccp
;
2796 switch (session
[s
].ppp
.ccp
)
2800 next_state
= RequestSent
;
2803 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
2805 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
2806 sess_local
[s
].ccp
.restart
= time_now
+ config
->ppp_restart_time
;
2807 sess_local
[s
].ccp
.conf_sent
++;
2809 change_state(s
, ccp
, next_state
);
2813 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
2814 change_state(s
, ccp
, Stopped
);
2821 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2822 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2824 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2825 STAT(session_timeout
);
2830 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2831 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2833 uint8_t b
[MAXCONTROL
] = {0};
2835 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
);
2839 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2840 *(uint16_t *)(q
+ 2) = htons(8); // Length
2841 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2843 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2844 (int)(time_now
- session
[s
].last_packet
));
2845 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2849 // Check for actions requested from the CLI
2850 if ((a
= cli_session_actions
[s
].action
))
2854 cli_session_actions
[s
].action
= 0;
2855 if (a
& CLI_SESS_KILL
)
2857 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2858 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2859 a
= 0; // dead, no need to check for other actions
2863 if (a
& CLI_SESS_NOSNOOP
)
2865 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2866 session
[s
].snoop_ip
= 0;
2867 session
[s
].snoop_port
= 0;
2871 else if (a
& CLI_SESS_SNOOP
)
2873 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2874 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2875 cli_session_actions
[s
].snoop_port
);
2877 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2878 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2883 if (a
& CLI_SESS_NOTHROTTLE
)
2885 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2886 throttle_session(s
, 0, 0);
2890 else if (a
& CLI_SESS_THROTTLE
)
2892 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2893 cli_session_actions
[s
].throttle_in
,
2894 cli_session_actions
[s
].throttle_out
);
2896 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2901 if (a
& CLI_SESS_NOFILTER
)
2903 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2904 filter_session(s
, 0, 0);
2908 else if (a
& CLI_SESS_FILTER
)
2910 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2911 cli_session_actions
[s
].filter_in
,
2912 cli_session_actions
[s
].filter_out
);
2914 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2920 cluster_send_session(s
);
2923 // RADIUS interim accounting
2924 if (config
->radius_accounting
&& config
->radius_interim
> 0
2925 && session
[s
].ip
&& !session
[s
].walled_garden
2926 && !sess_local
[s
].radius
// RADIUS already in progress
2927 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2929 int rad
= radiusnew(s
);
2932 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2933 STAT(radius_overflow
);
2937 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2938 session
[s
].user
, session
[s
].unique_id
);
2940 radiussend(rad
, RADIUSINTERIM
);
2941 sess_local
[s
].last_interim
= time_now
;
2946 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
2947 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
2951 // Are we in the middle of a tunnel update, or radius
2954 static int still_busy(void)
2957 static clockt last_talked
= 0;
2958 static clockt start_busy_wait
= 0;
2960 if (!config
->cluster_iam_master
)
2963 static time_t stopped_bgp
= 0;
2968 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
2970 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2971 if (bgp_peers
[i
].state
== Established
)
2972 bgp_stop(&bgp_peers
[i
]);
2974 stopped_bgp
= time_now
;
2976 // we don't want to become master
2977 cluster_send_ping(0);
2982 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
2990 if (main_quit
== QUIT_SHUTDOWN
)
2992 static int dropped
= 0;
2997 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
2998 for (i
= 1; i
< MAXTUNNEL
; i
++)
2999 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3000 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3006 if (start_busy_wait
== 0)
3007 start_busy_wait
= TIME
;
3009 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3011 if (!tunnel
[i
].controlc
)
3014 if (last_talked
!= TIME
)
3016 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
3022 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3023 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3025 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3029 for (i
= 1; i
< MAXRADIUS
; i
++)
3031 if (radius
[i
].state
== RADIUSNULL
)
3033 if (radius
[i
].state
== RADIUSWAIT
)
3036 if (last_talked
!= TIME
)
3038 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
3048 # include <sys/epoll.h>
3050 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3051 # include "fake_epoll.h"
3054 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3057 // additional polled fds
3059 # define EXTRA_FDS BGP_NUM_PEERS
3061 # define EXTRA_FDS 0
3064 // main loop - gets packets on tun or udp and processes them
3065 static void mainloop(void)
3069 clockt next_cluster_ping
= 0; // send initial ping immediately
3070 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3071 int maxevent
= sizeof(events
)/sizeof(*events
);
3073 if ((epollfd
= epoll_create(maxevent
)) < 0)
3075 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3079 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3080 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3082 /* setup our fds to poll for input */
3084 static struct event_data d
[BASE_FDS
];
3085 struct epoll_event e
;
3090 d
[i
].type
= FD_TYPE_CLI
;
3091 e
.data
.ptr
= &d
[i
++];
3092 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3094 d
[i
].type
= FD_TYPE_CLUSTER
;
3095 e
.data
.ptr
= &d
[i
++];
3096 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3098 d
[i
].type
= FD_TYPE_TUN
;
3099 e
.data
.ptr
= &d
[i
++];
3100 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3102 d
[i
].type
= FD_TYPE_UDP
;
3103 e
.data
.ptr
= &d
[i
++];
3104 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3106 d
[i
].type
= FD_TYPE_CONTROL
;
3107 e
.data
.ptr
= &d
[i
++];
3108 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3110 d
[i
].type
= FD_TYPE_DAE
;
3111 e
.data
.ptr
= &d
[i
++];
3112 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3116 signal(SIGPIPE
, SIG_IGN
);
3117 bgp_setup(config
->as_number
);
3118 if (config
->bind_address
)
3119 bgp_add_route(config
->bind_address
, 0xffffffff);
3121 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3123 if (config
->neighbour
[i
].name
[0])
3124 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3125 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3126 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3130 while (!main_quit
|| still_busy())
3135 if (config
->reload_config
)
3137 // Update the config state based on config settings
3145 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3146 STAT(select_called
);
3151 if (errno
== EINTR
||
3152 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3155 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3161 struct sockaddr_in addr
;
3166 int cluster_ready
= 0;
3169 int cluster_pkts
= 0;
3171 uint32_t bgp_events
[BGP_NUM_PEERS
];
3172 memset(bgp_events
, 0, sizeof(bgp_events
));
3175 for (c
= n
, i
= 0; i
< c
; i
++)
3177 struct event_data
*d
= events
[i
].data
.ptr
;
3180 case FD_TYPE_CLI
: // CLI connections
3184 alen
= sizeof(addr
);
3185 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3191 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3197 // these are handled below, with multiple interleaved reads
3198 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3199 case FD_TYPE_TUN
: tun_ready
++; break;
3200 case FD_TYPE_UDP
: udp_ready
++; break;
3202 case FD_TYPE_CONTROL
: // nsctl commands
3203 alen
= sizeof(addr
);
3204 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3208 case FD_TYPE_DAE
: // DAE requests
3209 alen
= sizeof(addr
);
3210 processdae(buf
, recvfrom(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3214 case FD_TYPE_RADIUS
: // RADIUS response
3215 s
= recv(radfds
[d
->index
], buf
, sizeof(buf
), 0);
3216 if (s
>= 0 && config
->cluster_iam_master
)
3217 processrad(buf
, s
, d
->index
);
3224 bgp_events
[d
->index
] = events
[i
].events
;
3230 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3235 bgp_process(bgp_events
);
3238 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3243 alen
= sizeof(addr
);
3244 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3246 processudp(buf
, s
, &addr
);
3259 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3274 alen
= sizeof(addr
);
3275 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3277 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3288 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3289 STAT(multi_read_used
);
3291 if (c
>= config
->multi_read_count
)
3293 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3294 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3296 STAT(multi_read_exceeded
);
3301 // Runs on every machine (master and slaves).
3302 if (next_cluster_ping
<= TIME
)
3304 // Check to see which of the cluster is still alive..
3306 cluster_send_ping(basetime
); // Only does anything if we're a slave
3307 cluster_check_master(); // ditto.
3309 cluster_heartbeat(); // Only does anything if we're a master.
3310 cluster_check_slaves(); // ditto.
3312 master_update_counts(); // If we're a slave, send our byte counters to our master.
3314 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3315 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3317 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3320 if (!config
->cluster_iam_master
)
3323 // Run token bucket filtering queue..
3324 // Only run it every 1/10th of a second.
3326 static clockt last_run
= 0;
3327 if (last_run
!= TIME
)
3334 // Handle timeouts, retries etc.
3336 static double last_clean
= 0;
3340 TIME
= now(&this_clean
);
3341 diff
= this_clean
- last_clean
;
3343 // Run during idle time (after we've handled
3344 // all incoming packets) or every 1/10th sec
3345 if (!more
|| diff
> 0.1)
3347 regular_cleanups(diff
);
3348 last_clean
= this_clean
;
3352 if (*config
->accounting_dir
)
3354 static clockt next_acct
= 0;
3355 static clockt next_shut_acct
= 0;
3357 if (next_acct
<= TIME
)
3359 // Dump accounting data
3360 next_acct
= TIME
+ ACCT_TIME
;
3361 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3364 else if (next_shut_acct
<= TIME
)
3366 // Dump accounting data for shutdown sessions
3367 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3374 // Are we the master and shutting down??
3375 if (config
->cluster_iam_master
)
3376 cluster_heartbeat(); // Flush any queued changes..
3378 // Ok. Notify everyone we're shutting down. If we're
3379 // the master, this will force an election.
3380 cluster_send_ping(0);
3383 // Important!!! We MUST not process any packets past this point!
3384 LOG(1, 0, 0, "Shutdown complete\n");
3387 static void stripdomain(char *host
)
3391 if ((p
= strchr(host
, '.')))
3397 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3403 while (fgets(buf
, sizeof(buf
), resolv
))
3405 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3408 if (!isspace(buf
[6]))
3412 while (isspace(*b
)) b
++;
3417 while (*b
&& !isspace(*b
)) b
++;
3419 if (buf
[0] == 'd') // domain is canonical
3425 // first search line
3428 // hold, may be subsequent domain line
3429 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3440 int hl
= strlen(host
);
3441 int dl
= strlen(domain
);
3442 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3443 host
[hl
-dl
- 1] = 0;
3447 *p
= 0; // everything after first dot
3452 // Init data structures
3453 static void initdata(int optdebug
, char *optconfig
)
3457 if (!(config
= shared_malloc(sizeof(configt
))))
3459 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3463 memset(config
, 0, sizeof(configt
));
3464 time(&config
->start_time
);
3465 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3466 config
->debug
= optdebug
;
3467 config
->num_tbfs
= MAXTBFS
;
3468 config
->rl_rate
= 28; // 28kbps
3469 config
->cluster_master_min_adv
= 1;
3470 config
->ppp_restart_time
= 3;
3471 config
->ppp_max_configure
= 10;
3472 config
->ppp_max_failure
= 5;
3473 strcpy(config
->random_device
, RANDOMDEVICE
);
3475 log_stream
= stderr
;
3478 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3480 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3483 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3486 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3488 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3491 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3493 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3496 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3498 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3502 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3504 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3508 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3510 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3514 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3516 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3520 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3522 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3525 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3527 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3529 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3532 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3534 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3536 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3539 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3541 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3542 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3543 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3544 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3546 // Put all the sessions on the free list marked as undefined.
3547 for (i
= 1; i
< MAXSESSION
; i
++)
3549 session
[i
].next
= i
+ 1;
3550 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3552 session
[MAXSESSION
- 1].next
= 0;
3555 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3556 for (i
= 1; i
< MAXTUNNEL
; i
++)
3557 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3561 // Grab my hostname unless it's been specified
3562 gethostname(hostname
, sizeof(hostname
));
3563 stripdomain(hostname
);
3566 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3569 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3571 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3577 static int assign_ip_address(sessionidt s
)
3581 time_t best_time
= time_now
;
3582 char *u
= session
[s
].user
;
3586 CSTAT(assign_ip_address
);
3588 for (i
= 1; i
< ip_pool_size
; i
++)
3590 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3593 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3600 if (ip_address_pool
[i
].last
< best_time
)
3603 if (!(best_time
= ip_address_pool
[i
].last
))
3604 break; // never used, grab this one
3610 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3614 session
[s
].ip
= ip_address_pool
[best
].address
;
3615 session
[s
].ip_pool_index
= best
;
3616 ip_address_pool
[best
].assigned
= 1;
3617 ip_address_pool
[best
].last
= time_now
;
3618 ip_address_pool
[best
].session
= s
;
3619 if (session
[s
].walled_garden
)
3620 /* Don't track addresses of users in walled garden (note: this
3621 means that their address isn't "sticky" even if they get
3623 ip_address_pool
[best
].user
[0] = 0;
3625 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3628 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3629 reuse
? "Reusing" : "Allocating", best
);
3634 static void free_ip_address(sessionidt s
)
3636 int i
= session
[s
].ip_pool_index
;
3639 CSTAT(free_ip_address
);
3642 return; // what the?
3644 if (i
< 0) // Is this actually part of the ip pool?
3648 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3650 ip_address_pool
[i
].assigned
= 0;
3651 ip_address_pool
[i
].session
= 0;
3652 ip_address_pool
[i
].last
= time_now
;
3656 // Fsck the address pool against the session table.
3657 // Normally only called when we become a master.
3659 // This isn't perfect: We aren't keep tracking of which
3660 // users used to have an IP address.
3662 void rebuild_address_pool(void)
3667 // Zero the IP pool allocation, and build
3668 // a map from IP address to pool index.
3669 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3671 ip_address_pool
[i
].assigned
= 0;
3672 ip_address_pool
[i
].session
= 0;
3673 if (!ip_address_pool
[i
].address
)
3676 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3679 for (i
= 0; i
< MAXSESSION
; ++i
)
3682 if (!(session
[i
].opened
&& session
[i
].ip
))
3685 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3687 if (session
[i
].ip_pool_index
< 0)
3689 // Not allocated out of the pool.
3690 if (ipid
< 1) // Not found in the pool either? good.
3693 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3694 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3696 // Fall through and process it as part of the pool.
3700 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3702 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3704 session
[i
].ip_pool_index
= ipid
;
3708 ip_address_pool
[ipid
].assigned
= 1;
3709 ip_address_pool
[ipid
].session
= i
;
3710 ip_address_pool
[ipid
].last
= time_now
;
3711 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3712 session
[i
].ip_pool_index
= ipid
;
3713 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3718 // Fix the address pool to match a changed session.
3719 // (usually when the master sends us an update).
3720 static void fix_address_pool(int sid
)
3724 ipid
= session
[sid
].ip_pool_index
;
3726 if (ipid
> ip_pool_size
)
3727 return; // Ignore it. rebuild_address_pool will fix it up.
3729 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3730 return; // Just ignore it. rebuild_address_pool will take care of it.
3732 ip_address_pool
[ipid
].assigned
= 1;
3733 ip_address_pool
[ipid
].session
= sid
;
3734 ip_address_pool
[ipid
].last
= time_now
;
3735 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3739 // Add a block of addresses to the IP pool to hand out.
3741 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3745 mask
= 0xffffffff; // Host route only.
3749 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3752 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3754 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3755 continue; // Skip 0 and broadcast addresses.
3757 ip_address_pool
[ip_pool_size
].address
= i
;
3758 ip_address_pool
[ip_pool_size
].assigned
= 0;
3760 if (ip_pool_size
>= MAXIPPOOL
)
3762 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3768 // Initialize the IP address pool
3769 static void initippool()
3774 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3776 if (!(f
= fopen(IPPOOLFILE
, "r")))
3778 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3782 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3785 buf
[4095] = 0; // Force it to be zero terminated/
3787 if (*buf
== '#' || *buf
== '\n')
3788 continue; // Skip comments / blank lines
3789 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3790 if ((p
= (char *)strchr(buf
, ':')))
3794 src
= inet_addr(buf
);
3795 if (src
== INADDR_NONE
)
3797 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3800 // This entry is for a specific IP only
3801 if (src
!= config
->bind_address
)
3806 if ((p
= (char *)strchr(pool
, '/')))
3810 in_addr_t start
= 0, mask
= 0;
3812 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3814 if (!*p
|| !(numbits
= atoi(p
)))
3816 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3819 start
= ntohl(inet_addr(pool
));
3820 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3822 // Add a static route for this pool
3823 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3824 fmtaddr(htonl(start
), 0), 32 + mask
);
3826 routeset(0, start
, mask
, 0, 1);
3828 add_to_ip_pool(start
, mask
);
3832 // It's a single ip address
3833 add_to_ip_pool(inet_addr(pool
), 0);
3837 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3840 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3842 struct sockaddr_in snoop_addr
= {0};
3843 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3846 snoop_addr
.sin_family
= AF_INET
;
3847 snoop_addr
.sin_addr
.s_addr
= destination
;
3848 snoop_addr
.sin_port
= ntohs(port
);
3850 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3851 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3852 htons(snoop_addr
.sin_port
));
3854 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3855 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3857 STAT(packets_snooped
);
3860 static int dump_session(FILE **f
, sessiont
*s
)
3862 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
3867 char filename
[1024];
3869 time_t now
= time(NULL
);
3871 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3872 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3874 if (!(*f
= fopen(filename
, "w")))
3876 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3880 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3881 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3886 "# format: username ip qos uptxoctets downrxoctets\n",
3888 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
3893 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3894 fprintf(*f
, "%s %s %d %u %u\n",
3895 s
->user
, // username
3896 fmtaddr(htonl(s
->ip
), 0), // ip
3897 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3898 (uint32_t) s
->cin_delta
, // uptxoctets
3899 (uint32_t) s
->cout_delta
); // downrxoctets
3901 s
->cin_delta
= s
->cout_delta
= 0;
3906 static void dump_acct_info(int all
)
3912 CSTAT(dump_acct_info
);
3916 for (i
= 0; i
< shut_acct_n
; i
++)
3917 dump_session(&f
, &shut_acct
[i
]);
3923 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3924 dump_session(&f
, &session
[i
]);
3931 int main(int argc
, char *argv
[])
3935 char *optconfig
= CONFIGFILE
;
3937 time(&basetime
); // start clock
3940 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3945 if (fork()) exit(0);
3947 freopen("/dev/null", "r", stdin
);
3948 freopen("/dev/null", "w", stdout
);
3949 freopen("/dev/null", "w", stderr
);
3958 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3961 printf("Args are:\n"
3962 "\t-d\t\tDetach from terminal\n"
3963 "\t-c <file>\tConfig file\n"
3964 "\t-h <hostname>\tForce hostname\n"
3972 // Start the timer routine off
3974 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3975 signal(SIGALRM
, sigalrm_handler
);
3976 siginterrupt(SIGALRM
, 0);
3979 initdata(optdebug
, optconfig
);
3983 init_tbf(config
->num_tbfs
);
3985 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3986 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3987 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3990 rlim
.rlim_cur
= RLIM_INFINITY
;
3991 rlim
.rlim_max
= RLIM_INFINITY
;
3992 // Remove the maximum core size
3993 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3994 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3996 // Make core dumps go to /tmp
4000 if (config
->scheduler_fifo
)
4003 struct sched_param params
= {0};
4004 params
.sched_priority
= 1;
4006 if (get_nprocs() < 2)
4008 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4009 config
->scheduler_fifo
= 0;
4013 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4015 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4019 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4020 config
->scheduler_fifo
= 0;
4025 /* Set up the cluster communications port. */
4026 if (cluster_init() < 0)
4030 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4038 unsigned seed
= time_now
^ getpid();
4039 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4043 signal(SIGHUP
, sighup_handler
);
4044 signal(SIGCHLD
, sigchild_handler
);
4045 signal(SIGTERM
, shutdown_handler
);
4046 signal(SIGINT
, shutdown_handler
);
4047 signal(SIGQUIT
, shutdown_handler
);
4049 // Prevent us from getting paged out
4050 if (config
->lock_pages
)
4052 if (!mlockall(MCL_CURRENT
))
4053 LOG(1, 0, 0, "Locking pages into memory\n");
4055 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4060 // Drop privileges here
4061 if (config
->target_uid
> 0 && geteuid() == 0)
4062 setuid(config
->target_uid
);
4066 /* remove plugins (so cleanup code gets run) */
4069 // Remove the PID file if we wrote it
4070 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4071 unlink(config
->pid_file
);
4073 /* kill CLI children */
4074 signal(SIGTERM
, SIG_IGN
);
4079 static void sighup_handler(int sig
)
4083 if (log_stream
!= stderr
)
4092 static void sigalrm_handler(int sig
)
4094 // Log current traffic stats
4096 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4097 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4098 (udp_rx
/ 1024.0 / 1024.0 * 8),
4099 (eth_tx
/ 1024.0 / 1024.0 * 8),
4100 (eth_rx
/ 1024.0 / 1024.0 * 8),
4101 (udp_tx
/ 1024.0 / 1024.0 * 8),
4102 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
4103 udp_rx_pkt
, eth_rx_pkt
);
4105 udp_tx
= udp_rx
= 0;
4106 udp_rx_pkt
= eth_rx_pkt
= 0;
4107 eth_tx
= eth_rx
= 0;
4109 if (config
->dump_speed
)
4110 printf("%s\n", config
->bandwidth
);
4112 // Update the internal time counter
4114 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4119 struct param_timer p
= { time_now
};
4120 run_plugins(PLUGIN_TIMER
, &p
);
4125 static void shutdown_handler(int sig
)
4127 LOG(1, 0, 0, "Shutting down\n");
4128 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4131 static void sigchild_handler(int sig
)
4133 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4137 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4140 *challenge_response
= NULL
;
4142 if (!*config
->l2tpsecret
)
4144 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4148 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4150 *challenge_response
= calloc(17, 1);
4153 MD5_Update(&ctx
, &id
, 1);
4154 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4155 MD5_Update(&ctx
, challenge
, challenge_length
);
4156 MD5_Final(*challenge_response
, &ctx
);
4161 static int facility_value(char *name
)
4164 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4166 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4167 return facilitynames
[i
].c_val
;
4172 static void update_config()
4176 static int timeout
= 0;
4177 static int interval
= 0;
4184 if (log_stream
!= stderr
)
4190 if (*config
->log_filename
)
4192 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4194 char *p
= config
->log_filename
+ 7;
4197 openlog("l2tpns", LOG_PID
, facility_value(p
));
4201 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4203 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4205 fseek(log_stream
, 0, SEEK_END
);
4206 setbuf(log_stream
, NULL
);
4210 log_stream
= stderr
;
4211 setbuf(log_stream
, NULL
);
4217 log_stream
= stderr
;
4218 setbuf(log_stream
, NULL
);
4222 config
->numradiusservers
= 0;
4223 for (i
= 0; i
< MAXRADSERVER
; i
++)
4224 if (config
->radiusserver
[i
])
4226 config
->numradiusservers
++;
4227 // Set radius port: if not set, take the port from the
4228 // first radius server. For the first radius server,
4229 // take the #defined default value from l2tpns.h
4231 // test twice, In case someone works with
4232 // a secondary radius server without defining
4233 // a primary one, this will work even then.
4234 if (i
> 0 && !config
->radiusport
[i
])
4235 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4236 if (!config
->radiusport
[i
])
4237 config
->radiusport
[i
] = RADPORT
;
4240 if (!config
->numradiusservers
)
4241 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4243 // parse radius_authtypes_s
4244 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4245 p
= config
->radius_authtypes_s
;
4248 char *s
= strpbrk(p
, " \t,");
4254 while (*s
== ' ' || *s
== '\t')
4261 if (!strncasecmp("chap", p
, strlen(p
)))
4263 else if (!strncasecmp("pap", p
, strlen(p
)))
4266 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4268 config
->radius_authtypes
|= type
;
4269 if (!config
->radius_authprefer
)
4270 config
->radius_authprefer
= type
;
4275 if (!config
->radius_authtypes
)
4277 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4278 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4281 // normalise radius_authtypes_s
4282 if (config
->radius_authprefer
== AUTHPAP
)
4284 strcpy(config
->radius_authtypes_s
, "pap");
4285 if (config
->radius_authtypes
& AUTHCHAP
)
4286 strcat(config
->radius_authtypes_s
, ", chap");
4290 strcpy(config
->radius_authtypes_s
, "chap");
4291 if (config
->radius_authtypes
& AUTHPAP
)
4292 strcat(config
->radius_authtypes_s
, ", pap");
4295 if (!config
->radius_dae_port
)
4296 config
->radius_dae_port
= DAEPORT
;
4298 // re-initialise the random number source
4299 initrandom(config
->random_device
);
4302 for (i
= 0; i
< MAXPLUGINS
; i
++)
4304 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4307 if (*config
->plugins
[i
])
4310 add_plugin(config
->plugins
[i
]);
4312 else if (*config
->old_plugins
[i
])
4315 remove_plugin(config
->old_plugins
[i
]);
4319 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4320 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4321 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4322 if (!*config
->cluster_interface
)
4323 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4325 if (!config
->cluster_hb_interval
)
4326 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4328 if (!config
->cluster_hb_timeout
)
4329 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4331 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4333 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4334 // late, ensure we're sufficiently larger than that
4335 int t
= 4 * config
->cluster_hb_interval
+ 11;
4337 if (config
->cluster_hb_timeout
< t
)
4339 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4340 config
->cluster_hb_timeout
= t
;
4343 // Push timing changes to the slaves immediately if we're the master
4344 if (config
->cluster_iam_master
)
4345 cluster_heartbeat();
4347 interval
= config
->cluster_hb_interval
;
4348 timeout
= config
->cluster_hb_timeout
;
4352 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4355 if ((f
= fopen(config
->pid_file
, "w")))
4357 fprintf(f
, "%d\n", getpid());
4359 config
->wrote_pid
= 1;
4363 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4367 config
->reload_config
= 0;
4370 static void read_config_file()
4374 if (!config
->config_file
) return;
4375 if (!(f
= fopen(config
->config_file
, "r")))
4377 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4381 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4383 LOG(3, 0, 0, "Done reading config file\n");
4388 int sessionsetup(sessionidt s
, tunnelidt t
)
4390 // A session now exists, set it up
4396 CSTAT(sessionsetup
);
4398 LOG(3, s
, t
, "Doing session setup for session\n");
4402 assign_ip_address(s
);
4405 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4406 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4409 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4410 fmtaddr(htonl(session
[s
].ip
), 0));
4414 // Make sure this is right
4415 session
[s
].tunnel
= t
;
4417 // zap old sessions with same IP and/or username
4418 // Don't kill gardened sessions - doing so leads to a DoS
4419 // from someone who doesn't need to know the password
4422 user
= session
[s
].user
;
4423 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4425 if (i
== s
) continue;
4426 if (!session
[s
].opened
) continue;
4427 if (ip
== session
[i
].ip
)
4429 sessionkill(i
, "Duplicate IP address");
4433 if (config
->allow_duplicate_users
) continue;
4434 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4435 if (!strcasecmp(user
, session
[i
].user
))
4436 sessionkill(i
, "Duplicate session for users");
4443 // Add the route for this session.
4444 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4446 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4447 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4450 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4453 // Static IPs need to be routed if not already
4454 // convered by a Framed-Route. Anything else is part
4455 // of the IP address pool and is already routed, it
4456 // just needs to be added to the IP cache.
4457 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4458 if (session
[s
].ip_pool_index
== -1) // static ip
4460 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4463 cache_ipmap(session
[s
].ip
, s
);
4466 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
4467 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
4469 // Run the plugin's against this new session.
4471 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4472 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4475 // Allocate TBFs if throttled
4476 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4477 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4479 session
[s
].last_packet
= time_now
;
4481 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4482 fmtaddr(htonl(session
[s
].ip
), 0),
4483 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4485 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4487 return 1; // RADIUS OK and IP allocated, done...
4491 // This session just got dropped on us by the master or something.
4492 // Make sure our tables up up to date...
4494 int load_session(sessionidt s
, sessiont
*new)
4500 if (new->ip_pool_index
>= MAXIPPOOL
||
4501 new->tunnel
>= MAXTUNNEL
)
4503 LOG(0, s
, 0, "Strange session update received!\n");
4504 // FIXME! What to do here?
4509 // Ok. All sanity checks passed. Now we're committed to
4510 // loading the new session.
4513 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4515 // See if routes/ip cache need updating
4516 if (new->ip
!= session
[s
].ip
)
4519 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4520 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4521 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4529 // remove old routes...
4530 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4532 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4533 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4536 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4542 if (session
[s
].ip_pool_index
== -1) // static IP
4544 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4546 else // It's part of the IP pool, remove it manually.
4547 uncache_ipmap(session
[s
].ip
);
4552 // add new routes...
4553 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4555 if ((new->ip
& new->route
[i
].mask
) ==
4556 (new->route
[i
].ip
& new->route
[i
].mask
))
4559 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4565 // If there's a new one, add it.
4566 if (new->ip_pool_index
== -1)
4568 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4571 cache_ipmap(new->ip
, s
);
4576 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
4577 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4580 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4582 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4586 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4588 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4589 new->filter_out
= 0;
4592 if (new->filter_in
!= session
[s
].filter_in
)
4594 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4595 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4598 if (new->filter_out
!= session
[s
].filter_out
)
4600 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4601 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4604 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4605 // for walking the sessions to forward byte counts to the master.
4606 config
->cluster_highest_sessionid
= s
;
4608 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4610 // Do fixups into address pool.
4611 if (new->ip_pool_index
!= -1)
4612 fix_address_pool(s
);
4617 static void initplugins()
4621 loaded_plugins
= ll_init();
4622 // Initialize the plugins to nothing
4623 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4624 plugins
[i
] = ll_init();
4627 static void *open_plugin(char *plugin_name
, int load
)
4629 char path
[256] = "";
4631 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4632 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4633 return dlopen(path
, RTLD_NOW
);
4636 // plugin callback to get a config value
4637 static void *getconfig(char *key
, enum config_typet type
)
4641 for (i
= 0; config_values
[i
].key
; i
++)
4643 if (!strcmp(config_values
[i
].key
, key
))
4645 if (config_values
[i
].type
== type
)
4646 return ((void *) config
) + config_values
[i
].offset
;
4648 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4649 key
, type
, config_values
[i
].type
);
4655 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4659 static int add_plugin(char *plugin_name
)
4661 static struct pluginfuncs funcs
= {
4666 sessiontbysessionidt
,
4667 sessionidtbysessiont
,
4674 cluster_send_session
,
4677 void *p
= open_plugin(plugin_name
, 1);
4678 int (*initfunc
)(struct pluginfuncs
*);
4683 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4687 if (ll_contains(loaded_plugins
, p
))
4690 return 0; // already loaded
4694 int *v
= dlsym(p
, "plugin_api_version");
4695 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4697 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4703 if ((initfunc
= dlsym(p
, "plugin_init")))
4705 if (!initfunc(&funcs
))
4707 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4713 ll_push(loaded_plugins
, p
);
4715 for (i
= 0; i
< max_plugin_functions
; i
++)
4718 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4720 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4721 ll_push(plugins
[i
], x
);
4725 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4729 static void run_plugin_done(void *plugin
)
4731 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4737 static int remove_plugin(char *plugin_name
)
4739 void *p
= open_plugin(plugin_name
, 0);
4745 if (ll_contains(loaded_plugins
, p
))
4748 for (i
= 0; i
< max_plugin_functions
; i
++)
4751 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4752 ll_delete(plugins
[i
], x
);
4755 ll_delete(loaded_plugins
, p
);
4761 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4765 int run_plugins(int plugin_type
, void *data
)
4767 int (*func
)(void *data
);
4769 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4770 return PLUGIN_RET_ERROR
;
4772 ll_reset(plugins
[plugin_type
]);
4773 while ((func
= ll_next(plugins
[plugin_type
])))
4777 if (r
!= PLUGIN_RET_OK
)
4778 return r
; // stop here
4781 return PLUGIN_RET_OK
;
4784 static void plugins_done()
4788 ll_reset(loaded_plugins
);
4789 while ((p
= ll_next(loaded_plugins
)))
4793 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4795 struct nsctl request
;
4796 struct nsctl response
;
4797 int type
= unpack_control(&request
, buf
, len
);
4801 if (log_stream
&& config
->debug
>= 4)
4805 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4806 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4810 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4811 dump_control(&request
, log_stream
);
4817 case NSCTL_REQ_LOAD
:
4818 if (request
.argc
!= 1)
4820 response
.type
= NSCTL_RES_ERR
;
4822 response
.argv
[0] = "name of plugin required";
4824 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4826 response
.type
= NSCTL_RES_ERR
;
4828 response
.argv
[0] = !r
4829 ? "plugin already loaded"
4830 : "error loading plugin";
4834 response
.type
= NSCTL_RES_OK
;
4840 case NSCTL_REQ_UNLOAD
:
4841 if (request
.argc
!= 1)
4843 response
.type
= NSCTL_RES_ERR
;
4845 response
.argv
[0] = "name of plugin required";
4847 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4849 response
.type
= NSCTL_RES_ERR
;
4851 response
.argv
[0] = !r
4852 ? "plugin not loaded"
4853 : "plugin not found";
4857 response
.type
= NSCTL_RES_OK
;
4863 case NSCTL_REQ_HELP
:
4864 response
.type
= NSCTL_RES_OK
;
4867 ll_reset(loaded_plugins
);
4868 while ((p
= ll_next(loaded_plugins
)))
4870 char **help
= dlsym(p
, "plugin_control_help");
4871 while (response
.argc
< 0xff && help
&& *help
)
4872 response
.argv
[response
.argc
++] = *help
++;
4877 case NSCTL_REQ_CONTROL
:
4879 struct param_control param
= {
4880 config
->cluster_iam_master
,
4887 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4889 if (r
== PLUGIN_RET_ERROR
)
4891 response
.type
= NSCTL_RES_ERR
;
4893 response
.argv
[0] = param
.additional
4895 : "error returned by plugin";
4897 else if (r
== PLUGIN_RET_NOTMASTER
)
4899 static char msg
[] = "must be run on master: 000.000.000.000";
4901 response
.type
= NSCTL_RES_ERR
;
4903 if (config
->cluster_master_address
)
4905 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4906 response
.argv
[0] = msg
;
4910 response
.argv
[0] = "must be run on master: none elected";
4913 else if (!(param
.response
& NSCTL_RESPONSE
))
4915 response
.type
= NSCTL_RES_ERR
;
4917 response
.argv
[0] = param
.response
4918 ? "unrecognised response value from plugin"
4919 : "unhandled action";
4923 response
.type
= param
.response
;
4925 if (param
.additional
)
4928 response
.argv
[0] = param
.additional
;
4936 response
.type
= NSCTL_RES_ERR
;
4938 response
.argv
[0] = "error unpacking control packet";
4941 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4944 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4948 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4951 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4952 if (log_stream
&& config
->debug
>= 4)
4954 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4955 dump_control(&response
, log_stream
);
4959 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4960 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4965 static tunnelidt
new_tunnel()
4968 for (i
= 1; i
< MAXTUNNEL
; i
++)
4970 if (tunnel
[i
].state
== TUNNELFREE
)
4972 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4973 if (i
> config
->cluster_highest_tunnelid
)
4974 config
->cluster_highest_tunnelid
= i
;
4978 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4983 // We're becoming the master. Do any required setup..
4985 // This is principally telling all the plugins that we're
4986 // now a master, and telling them about all the sessions
4987 // that are active too..
4989 void become_master(void)
4992 static struct event_data d
[RADIUS_FDS
];
4993 struct epoll_event e
;
4995 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4997 // running a bunch of iptables commands is slow and can cause
4998 // the master to drop tunnels on takeover--kludge around the
4999 // problem by forking for the moment (note: race)
5000 if (!fork_and_close())
5002 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5004 if (!session
[s
].opened
) // Not an in-use session.
5007 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5014 for (i
= 0; i
< RADIUS_FDS
; i
++)
5016 d
[i
].type
= FD_TYPE_RADIUS
;
5020 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5024 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5030 if (CLI_HELP_REQUESTED
)
5031 return CLI_HELP_NO_ARGS
;
5034 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5036 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5039 if (!session
[s
].opened
)
5042 idle
= time_now
- session
[s
].last_packet
;
5043 idle
/= 5 ; // In multiples of 5 seconds.
5053 for (i
= 0; i
< 63; ++i
)
5055 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5057 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5058 cli_print(cli
, "%d total sessions open.", count
);
5062 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5068 if (CLI_HELP_REQUESTED
)
5069 return CLI_HELP_NO_ARGS
;
5072 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5074 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5077 if (!session
[s
].opened
)
5080 d
= time_now
- session
[s
].opened
;
5083 while (d
> 1 && open
< 32)
5093 for (i
= 0; i
< 30; ++i
)
5095 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5098 cli_print(cli
, "%d total sessions open.", count
);
5104 * This unencodes the AVP using the L2TP secret and the previously
5105 * stored random vector. It overwrites the hidden data with the
5106 * unhidden AVP subformat.
5108 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5114 uint16_t m
= htons(type
);
5116 // Compute initial pad
5118 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5119 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5120 MD5_Update(&ctx
, vector
, vec_len
);
5121 MD5_Final(digest
, &ctx
);
5123 // pointer to last decoded 16 octets
5128 // calculate a new pad based on the last decoded block
5129 if (d
>= sizeof(digest
))
5132 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5133 MD5_Update(&ctx
, last
, sizeof(digest
));
5134 MD5_Final(digest
, &ctx
);
5140 *value
++ ^= digest
[d
++];
5145 int find_filter(char const *name
, size_t len
)
5150 for (i
= 0; i
< MAXFILTER
; i
++)
5152 if (!*ip_filters
[i
].name
)
5160 if (strlen(ip_filters
[i
].name
) != len
)
5163 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5170 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5174 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5175 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5176 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5177 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5178 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5184 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5188 case FILTER_FLAG_OP_ANY
:
5189 return (flags
& sflags
) || (~flags
& cflags
);
5191 case FILTER_FLAG_OP_ALL
:
5192 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5194 case FILTER_FLAG_OP_EST
:
5195 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5201 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5203 uint16_t frag_offset
;
5207 uint16_t src_port
= 0;
5208 uint16_t dst_port
= 0;
5210 ip_filter_rulet
*rule
;
5212 if (len
< 20) // up to end of destination address
5215 if ((*buf
>> 4) != 4) // IPv4
5218 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5220 src_ip
= *(in_addr_t
*) (buf
+ 12);
5221 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5223 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5225 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5226 if (len
< l
+ 4) // ports
5229 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5230 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5231 if (proto
== IPPROTO_TCP
)
5233 if (len
< l
+ 14) // flags
5236 flags
= buf
[l
+ 13] & 0x3f;
5240 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5242 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5245 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5246 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5249 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5250 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5255 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5263 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5265 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5268 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5271 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5272 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5279 return rule
->action
== FILTER_ACTION_PERMIT
;