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 1.124 2005/08/29 06:17:53 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
];
1587 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
1589 if (!session
[s
].unique_id
)
1591 if (!++last_id
) ++last_id
; // skip zero
1592 session
[s
].unique_id
= last_id
;
1595 q
= makeppp(buf
,sizeof(buf
), 0, 0, s
, t
, PPPIPCP
);
1599 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
1600 *(uint16_t *) (q
+ 2) = htons(10); // packet length
1601 q
[4] = 3; // ip address option
1602 q
[5] = 6; // option length
1603 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1604 config
->bind_address
? config
->bind_address
:
1605 my_address
; // send my IP
1607 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1610 void sendipv6cp(sessionidt s
, tunnelidt t
)
1612 uint8_t buf
[MAXCONTROL
];
1616 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
1618 q
= makeppp(buf
,sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
);
1622 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
1623 // only send one type
1625 *(uint16_t *) (q
+ 2) = htons(14);
1626 q
[4] = 1; // interface identifier option
1627 q
[5] = 10; // option length
1628 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1629 *(uint32_t *) (q
+ 10) = 0;
1632 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1635 static void sessionclear(sessionidt s
)
1637 memset(&session
[s
], 0, sizeof(session
[s
]));
1638 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1639 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1641 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1642 session
[s
].next
= sessionfree
;
1646 // kill a session now
1647 void sessionkill(sessionidt s
, char *reason
)
1652 if (!session
[s
].opened
) // not alive
1655 if (session
[s
].next
)
1657 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1661 session
[s
].die
= TIME
;
1662 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1663 if (sess_local
[s
].radius
)
1664 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1666 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1668 cluster_send_session(s
);
1671 static void tunnelclear(tunnelidt t
)
1674 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1675 tunnel
[t
].state
= TUNNELFREE
;
1678 // kill a tunnel now
1679 static void tunnelkill(tunnelidt t
, char *reason
)
1686 tunnel
[t
].state
= TUNNELDIE
;
1688 // free control messages
1689 while ((c
= tunnel
[t
].controls
))
1691 controlt
* n
= c
->next
;
1692 tunnel
[t
].controls
= n
;
1693 tunnel
[t
].controlc
--;
1694 c
->next
= controlfree
;
1698 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1699 if (session
[s
].tunnel
== t
)
1700 sessionkill(s
, reason
);
1704 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1705 cli_tunnel_actions
[t
].action
= 0;
1706 cluster_send_tunnel(t
);
1709 // shut down a tunnel cleanly
1710 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1714 CSTAT(tunnelshutdown
);
1716 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1718 // never set up, can immediately kill
1719 tunnelkill(t
, reason
);
1722 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1725 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1726 if (session
[s
].tunnel
== t
)
1727 sessionshutdown(s
, reason
, 0, 0);
1729 tunnel
[t
].state
= TUNNELDIE
;
1730 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1731 cluster_send_tunnel(t
);
1732 // TBA - should we wait for sessions to stop?
1735 controlt
*c
= controlnew(4); // sending StopCCN
1740 *(uint16_t *) buf
= htons(result
);
1741 *(uint16_t *) (buf
+2) = htons(error
);
1744 int m
= strlen(msg
);
1745 if (m
+ 4 > sizeof(buf
))
1746 m
= sizeof(buf
) - 4;
1748 memcpy(buf
+4, msg
, m
);
1752 controlb(c
, 1, buf
, l
, 1);
1755 control16(c
, 1, result
, 1);
1757 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1758 controladd(c
, 0, t
); // send the message
1762 // read and process packet on tunnel (UDP)
1763 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
1765 uint8_t *chapresponse
= NULL
;
1766 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1767 uint8_t *p
= buf
+ 2;
1774 LOG_HEX(5, "UDP Data", buf
, len
);
1775 STAT(tunnel_rx_packets
);
1776 INC_STAT(tunnel_rx_bytes
, len
);
1779 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1780 STAT(tunnel_rx_errors
);
1783 if ((buf
[1] & 0x0F) != 2)
1785 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1786 STAT(tunnel_rx_errors
);
1791 l
= ntohs(*(uint16_t *) p
);
1794 t
= ntohs(*(uint16_t *) p
);
1796 s
= ntohs(*(uint16_t *) p
);
1798 if (s
>= MAXSESSION
)
1800 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1801 STAT(tunnel_rx_errors
);
1806 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1807 STAT(tunnel_rx_errors
);
1812 ns
= ntohs(*(uint16_t *) p
);
1814 nr
= ntohs(*(uint16_t *) p
);
1819 uint16_t o
= ntohs(*(uint16_t *) p
);
1824 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1825 STAT(tunnel_rx_errors
);
1831 uint16_t message
= 0xFFFF; // message type
1833 uint8_t mandatory
= 0;
1834 uint16_t asession
= 0; // assigned session
1835 uint32_t amagic
= 0; // magic number
1836 uint8_t aflags
= 0; // flags from last LCF
1837 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1838 char called
[MAXTEL
] = ""; // called number
1839 char calling
[MAXTEL
] = ""; // calling number
1841 if (!config
->cluster_iam_master
)
1843 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1847 // control messages must have bits 0x80|0x40|0x08
1848 // (type, length and sequence) set, and bits 0x02|0x01
1849 // (offset and priority) clear
1850 if ((*buf
& 0xCB) != 0xC8)
1852 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1853 STAT(tunnel_rx_errors
);
1857 // check for duplicate tunnel open message
1863 // Is this a duplicate of the first packet? (SCCRQ)
1865 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1867 if (tunnel
[i
].state
!= TUNNELOPENING
||
1868 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1869 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1872 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1877 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1878 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1880 // if no tunnel specified, assign one
1883 if (!(t
= new_tunnel()))
1885 LOG(1, 0, 0, "No more tunnels\n");
1886 STAT(tunnel_overflow
);
1890 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1891 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1892 tunnel
[t
].window
= 4; // default window
1893 STAT(tunnel_created
);
1894 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1895 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1898 // If the 'ns' just received is not the 'nr' we're
1899 // expecting, just send an ack and drop it.
1901 // if 'ns' is less, then we got a retransmitted packet.
1902 // if 'ns' is greater than missed a packet. Either way
1903 // we should ignore it.
1904 if (ns
!= tunnel
[t
].nr
)
1906 // is this the sequence we were expecting?
1907 STAT(tunnel_rx_errors
);
1908 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1909 t
, ns
, tunnel
[t
].nr
);
1911 if (l
) // Is this not a ZLB?
1916 // This is used to time out old tunnels
1917 tunnel
[t
].lastrec
= time_now
;
1919 // check sequence of this message
1921 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1922 // some to clear maybe?
1923 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1925 controlt
*c
= tunnel
[t
].controls
;
1926 tunnel
[t
].controls
= c
->next
;
1927 tunnel
[t
].controlc
--;
1928 c
->next
= controlfree
;
1931 tunnel
[t
].try = 0; // we have progress
1934 // receiver advance (do here so quoted correctly in any sends below)
1935 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1936 if (skip
< 0) skip
= 0;
1937 if (skip
< tunnel
[t
].controlc
)
1939 // some control packets can now be sent that were previous stuck out of window
1940 int tosend
= tunnel
[t
].window
- skip
;
1941 controlt
*c
= tunnel
[t
].controls
;
1949 tunnel
[t
].try = 0; // first send
1950 tunnelsend(c
->buf
, c
->length
, t
);
1955 if (!tunnel
[t
].controlc
)
1956 tunnel
[t
].retry
= 0; // caught up
1959 { // if not a null message
1965 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1967 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1973 LOG(1, s
, t
, "Invalid length in AVP\n");
1974 STAT(tunnel_rx_errors
);
1979 if (flags
& 0x3C) // reserved bits, should be clear
1981 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1983 result
= 2; // general error
1984 error
= 3; // reserved field non-zero
1989 if (*(uint16_t *) (b
))
1991 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1993 result
= 2; // general error
1994 error
= 6; // generic vendor-specific error
1995 msg
= "unsupported vendor-specific";
1999 mtype
= ntohs(*(uint16_t *) (b
));
2007 // handle hidden AVPs
2008 if (!*config
->l2tpsecret
)
2010 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2012 result
= 2; // general error
2013 error
= 6; // generic vendor-specific error
2014 msg
= "secret not specified";
2017 if (!session
[s
].random_vector_length
)
2019 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2021 result
= 2; // general error
2022 error
= 6; // generic
2023 msg
= "no random vector";
2028 LOG(2, s
, t
, "Short hidden AVP.\n");
2030 result
= 2; // general error
2031 error
= 2; // length is wrong
2037 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2039 orig_len
= ntohs(*(uint16_t *) b
);
2040 if (orig_len
> n
+ 2)
2042 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2046 result
= 2; // general error
2047 error
= 2; // length is wrong
2056 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2057 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2061 case 0: // message type
2062 message
= ntohs(*(uint16_t *) b
);
2063 mandatory
= flags
& 0x80;
2064 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_code(message
));
2066 case 1: // result code
2068 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2069 const char* resdesc
= "(unknown)";
2072 resdesc
= l2tp_stopccn_result_code(rescode
);
2074 else if (message
== 14)
2076 resdesc
= l2tp_cdn_result_code(rescode
);
2079 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2082 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2083 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, l2tp_error_code(errcode
));
2086 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2091 case 2: // protocol version
2093 version
= ntohs(*(uint16_t *) (b
));
2094 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2095 if (version
&& version
!= 0x0100)
2096 { // allow 0.0 and 1.0
2097 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2099 result
= 5; // unspported protocol version
2100 error
= 0x0100; // supported version
2106 case 3: // framing capabilities
2107 // LOG(4, s, t, "Framing capabilities\n");
2109 case 4: // bearer capabilities
2110 // LOG(4, s, t, "Bearer capabilities\n");
2112 case 5: // tie breaker
2113 // We never open tunnels, so we don't care about tie breakers
2114 // LOG(4, s, t, "Tie breaker\n");
2116 case 6: // firmware revision
2117 // LOG(4, s, t, "Firmware revision\n");
2119 case 7: // host name
2120 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2121 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2122 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2123 // TBA - to send to RADIUS
2125 case 8: // vendor name
2126 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2127 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2128 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2130 case 9: // assigned tunnel
2131 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2132 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2134 case 10: // rx window
2135 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2136 if (!tunnel
[t
].window
)
2137 tunnel
[t
].window
= 1; // window of 0 is silly
2138 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2140 case 11: // Challenge
2142 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2143 build_chap_response(b
, 2, n
, &chapresponse
);
2146 case 13: // Response
2147 // Why did they send a response? We never challenge.
2148 LOG(2, s
, t
, " received unexpected challenge response\n");
2151 case 14: // assigned session
2152 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2153 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2155 case 15: // call serial number
2156 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2158 case 18: // bearer type
2159 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2162 case 19: // framing type
2163 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2166 case 21: // called number
2167 memset(called
, 0, sizeof(called
));
2168 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2169 LOG(4, s
, t
, " Called <%s>\n", called
);
2171 case 22: // calling number
2172 memset(calling
, 0, sizeof(calling
));
2173 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2174 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2178 case 24: // tx connect speed
2181 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2185 // AS5300s send connect speed as a string
2187 memset(tmp
, 0, sizeof(tmp
));
2188 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2189 session
[s
].tx_connect_speed
= atol(tmp
);
2191 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2193 case 38: // rx connect speed
2196 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2200 // AS5300s send connect speed as a string
2202 memset(tmp
, 0, sizeof(tmp
));
2203 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2204 session
[s
].rx_connect_speed
= atol(tmp
);
2206 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2208 case 25: // Physical Channel ID
2210 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2211 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2214 case 29: // Proxy Authentication Type
2216 uint16_t atype
= ntohs(*(uint16_t *)b
);
2217 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, ppp_auth_type(atype
));
2220 case 30: // Proxy Authentication Name
2223 memset(authname
, 0, sizeof(authname
));
2224 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2225 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2229 case 31: // Proxy Authentication Challenge
2231 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2234 case 32: // Proxy Authentication ID
2236 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2237 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2240 case 33: // Proxy Authentication Response
2241 LOG(4, s
, t
, " Proxy Auth Response\n");
2243 case 27: // last sent lcp
2244 { // find magic number
2245 uint8_t *p
= b
, *e
= p
+ n
;
2246 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2248 if (*p
== 5 && p
[1] == 6) // Magic-Number
2249 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2250 else if (*p
== 7) // Protocol-Field-Compression
2251 aflags
|= SESSIONPFC
;
2252 else if (*p
== 8) // Address-and-Control-Field-Compression
2253 aflags
|= SESSIONACFC
;
2258 case 28: // last recv lcp confreq
2260 case 26: // Initial Received LCP CONFREQ
2262 case 39: // seq required - we control it as an LNS anyway...
2264 case 36: // Random Vector
2265 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2266 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2267 if (n
> sizeof(session
[s
].random_vector
))
2268 n
= sizeof(session
[s
].random_vector
);
2269 memcpy(session
[s
].random_vector
, b
, n
);
2270 session
[s
].random_vector_length
= n
;
2274 static char e
[] = "unknown AVP 0xXXXX";
2275 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2277 result
= 2; // general error
2278 error
= 8; // unknown mandatory AVP
2279 sprintf((msg
= e
) + 14, "%04x", mtype
);
2286 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2290 case 1: // SCCRQ - Start Control Connection Request
2291 tunnel
[t
].state
= TUNNELOPENING
;
2292 if (main_quit
!= QUIT_SHUTDOWN
)
2294 controlt
*c
= controlnew(2); // sending SCCRP
2295 control16(c
, 2, version
, 1); // protocol version
2296 control32(c
, 3, 3, 1); // framing
2297 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2298 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2299 control16(c
, 9, t
, 1); // assigned tunnel
2300 controladd(c
, 0, t
); // send the resply
2304 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2308 tunnel
[t
].state
= TUNNELOPEN
;
2311 tunnel
[t
].state
= TUNNELOPEN
;
2312 controlnull(t
); // ack
2315 controlnull(t
); // ack
2316 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2319 controlnull(t
); // simply ACK
2331 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2333 controlt
*c
= controlnew(11); // ICRP
2336 sessionfree
= session
[s
].next
;
2337 memset(&session
[s
], 0, sizeof(session
[s
]));
2339 if (s
> config
->cluster_highest_sessionid
)
2340 config
->cluster_highest_sessionid
= s
;
2342 session
[s
].opened
= time_now
;
2343 session
[s
].tunnel
= t
;
2344 session
[s
].far
= asession
;
2345 session
[s
].last_packet
= time_now
;
2346 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2347 control16(c
, 14, s
, 1); // assigned session
2348 controladd(c
, asession
, t
); // send the reply
2350 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2351 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2353 session
[s
].ppp
.phase
= Establish
;
2354 session
[s
].ppp
.lcp
= Starting
;
2356 STAT(session_created
);
2361 controlt
*c
= controlnew(14); // CDN
2364 STAT(session_overflow
);
2365 LOG(1, 0, t
, "No free sessions\n");
2366 control16(c
, 1, 4, 0); // temporary lack of resources
2369 control16(c
, 1, 2, 7); // shutting down, try another
2371 controladd(c
, asession
, t
); // send the message
2378 if (amagic
== 0) amagic
= time_now
;
2379 session
[s
].magic
= amagic
; // set magic number
2380 session
[s
].l2tp_flags
= aflags
; // set flags received
2381 session
[s
].mru
= DEFAULT_MRU
;
2382 controlnull(t
); // ack
2385 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2386 sess_local
[s
].lcp
.conf_sent
= 1;
2387 sess_local
[s
].lcp
.nak_sent
= 0;
2388 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
2389 session
[s
].ppp
.lcp
= RequestSent
;
2394 controlnull(t
); // ack
2395 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2398 LOG(1, s
, t
, "Missing message type\n");
2401 STAT(tunnel_rx_errors
);
2403 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2405 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2408 if (chapresponse
) free(chapresponse
);
2409 cluster_send_tunnel(t
);
2413 LOG(4, s
, t
, " Got a ZLB ack\n");
2420 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2421 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2422 { // HDLC address header, discard
2428 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2429 STAT(tunnel_rx_errors
);
2439 prot
= ntohs(*(uint16_t *) p
);
2444 if (s
&& !session
[s
].opened
) // Is something wrong??
2446 if (!config
->cluster_iam_master
)
2448 // Pass it off to the master to deal with..
2449 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2454 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2455 STAT(tunnel_rx_errors
);
2461 session
[s
].last_packet
= time_now
;
2462 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2463 processpap(s
, t
, p
, l
);
2465 else if (prot
== PPPCHAP
)
2467 session
[s
].last_packet
= time_now
;
2468 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2469 processchap(s
, t
, p
, l
);
2471 else if (prot
== PPPLCP
)
2473 session
[s
].last_packet
= time_now
;
2474 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2475 processlcp(s
, t
, p
, l
);
2477 else if (prot
== PPPIPCP
)
2479 session
[s
].last_packet
= time_now
;
2480 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2481 processipcp(s
, t
, p
, l
);
2483 else if (prot
== PPPIPV6CP
)
2485 session
[s
].last_packet
= time_now
;
2486 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2487 processipv6cp(s
, t
, p
, l
);
2489 else if (prot
== PPPCCP
)
2491 session
[s
].last_packet
= time_now
;
2492 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2493 processccp(s
, t
, p
, l
);
2495 else if (prot
== PPPIP
)
2499 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2500 return; // closing session, PPP not processed
2503 session
[s
].last_packet
= time_now
;
2504 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2506 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2510 processipin(s
, t
, p
, l
);
2512 else if (prot
== PPPIPV6
)
2514 if (!config
->ipv6_prefix
.s6_addr
[0])
2516 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2521 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2522 return; // closing session, PPP not processed
2525 session
[s
].last_packet
= time_now
;
2526 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2528 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2532 processipv6in(s
, t
, p
, l
);
2536 STAT(tunnel_rx_errors
);
2537 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2542 // read and process packet on tun
2543 static void processtun(uint8_t * buf
, int len
)
2545 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2546 STAT(tun_rx_packets
);
2547 INC_STAT(tun_rx_bytes
, len
);
2555 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2556 STAT(tun_rx_errors
);
2560 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2561 processipout(buf
, len
);
2562 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2563 && config
->ipv6_prefix
.s6_addr
[0])
2564 processipv6out(buf
, len
);
2569 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2570 // that we look at the whole of the tunnel, radius and session tables
2572 static void regular_cleanups(double period
)
2574 // Next tunnel, radius and session to check for actions on.
2575 static tunnelidt t
= 0;
2577 static sessionidt s
= 0;
2590 // divide up tables into slices based on the last run
2591 t_slice
= config
->cluster_highest_tunnelid
* period
;
2592 r_slice
= (MAXRADIUS
- 1) * period
;
2593 s_slice
= config
->cluster_highest_sessionid
* period
;
2597 else if (t_slice
> config
->cluster_highest_tunnelid
)
2598 t_slice
= config
->cluster_highest_tunnelid
;
2602 else if (r_slice
> (MAXRADIUS
- 1))
2603 r_slice
= MAXRADIUS
- 1;
2607 else if (s_slice
> config
->cluster_highest_sessionid
)
2608 s_slice
= config
->cluster_highest_sessionid
;
2610 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2612 for (i
= 0; i
< t_slice
; i
++)
2615 if (t
> config
->cluster_highest_tunnelid
)
2618 // check for expired tunnels
2619 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2621 STAT(tunnel_timeout
);
2622 tunnelkill(t
, "Expired");
2626 // check for message resend
2627 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2629 // resend pending messages as timeout on reply
2630 if (tunnel
[t
].retry
<= TIME
)
2632 controlt
*c
= tunnel
[t
].controls
;
2633 uint8_t w
= tunnel
[t
].window
;
2634 tunnel
[t
].try++; // another try
2635 if (tunnel
[t
].try > 5)
2636 tunnelkill(t
, "Timeout on control message"); // game over
2640 tunnelsend(c
->buf
, c
->length
, t
);
2648 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2650 controlt
*c
= controlnew(6); // sending HELLO
2651 controladd(c
, 0, t
); // send the message
2652 LOG(3, 0, t
, "Sending HELLO message\n");
2656 // Check for tunnel changes requested from the CLI
2657 if ((a
= cli_tunnel_actions
[t
].action
))
2659 cli_tunnel_actions
[t
].action
= 0;
2660 if (a
& CLI_TUN_KILL
)
2662 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2663 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2669 for (i
= 0; i
< r_slice
; i
++)
2675 if (!radius
[r
].state
)
2678 if (radius
[r
].retry
<= TIME
)
2685 for (i
= 0; i
< s_slice
; i
++)
2688 if (s
> config
->cluster_highest_sessionid
)
2691 if (!session
[s
].opened
) // Session isn't in use
2694 // check for expired sessions
2697 if (session
[s
].die
<= TIME
)
2699 sessionkill(s
, "Expired");
2706 if (sess_local
[s
].lcp
.restart
<= time_now
)
2708 int next_state
= session
[s
].ppp
.lcp
;
2709 switch (session
[s
].ppp
.lcp
)
2713 next_state
= RequestSent
;
2716 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
2718 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
2719 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2720 sess_local
[s
].lcp
.conf_sent
++;
2721 sendlcp(s
, session
[s
].tunnel
);
2722 change_state(s
, lcp
, next_state
);
2726 sessionshutdown(s
, "No response to LCP ConfigReq.", 3, 0);
2727 STAT(session_timeout
);
2737 if (sess_local
[s
].ipcp
.restart
<= time_now
)
2739 int next_state
= session
[s
].ppp
.ipcp
;
2740 switch (session
[s
].ppp
.ipcp
)
2744 next_state
= RequestSent
;
2747 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
2749 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
2750 sess_local
[s
].ipcp
.restart
= time_now
+ config
->ppp_restart_time
;
2751 sess_local
[s
].ipcp
.conf_sent
++;
2752 sendipcp(s
, session
[s
].tunnel
);
2753 change_state(s
, ipcp
, next_state
);
2757 sessionshutdown(s
, "No response to IPCP ConfigReq.", 3, 0);
2758 STAT(session_timeout
);
2768 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
2770 int next_state
= session
[s
].ppp
.ipv6cp
;
2771 switch (session
[s
].ppp
.ipv6cp
)
2775 next_state
= RequestSent
;
2778 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
2780 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
2781 sess_local
[s
].ipv6cp
.restart
= time_now
+ config
->ppp_restart_time
;
2782 sess_local
[s
].ipv6cp
.conf_sent
++;
2783 sendipv6cp(s
, session
[s
].tunnel
);
2784 change_state(s
, ipv6cp
, next_state
);
2788 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
2789 change_state(s
, ipv6cp
, Stopped
);
2796 if (sess_local
[s
].ccp
.restart
<= time_now
)
2798 int next_state
= session
[s
].ppp
.ccp
;
2799 switch (session
[s
].ppp
.ccp
)
2803 next_state
= RequestSent
;
2806 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
2808 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
2809 sess_local
[s
].ccp
.restart
= time_now
+ config
->ppp_restart_time
;
2810 sess_local
[s
].ccp
.conf_sent
++;
2811 sendccp(s
, session
[s
].tunnel
);
2812 change_state(s
, ccp
, next_state
);
2816 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
2817 change_state(s
, ccp
, Stopped
);
2824 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2825 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2827 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2828 STAT(session_timeout
);
2833 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2834 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2836 uint8_t b
[MAXCONTROL
] = {0};
2838 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
);
2842 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2843 *(uint16_t *)(q
+ 2) = htons(8); // Length
2844 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2846 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2847 (int)(time_now
- session
[s
].last_packet
));
2848 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2852 // Check for actions requested from the CLI
2853 if ((a
= cli_session_actions
[s
].action
))
2857 cli_session_actions
[s
].action
= 0;
2858 if (a
& CLI_SESS_KILL
)
2860 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2861 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2862 a
= 0; // dead, no need to check for other actions
2866 if (a
& CLI_SESS_NOSNOOP
)
2868 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2869 session
[s
].snoop_ip
= 0;
2870 session
[s
].snoop_port
= 0;
2874 else if (a
& CLI_SESS_SNOOP
)
2876 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2877 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2878 cli_session_actions
[s
].snoop_port
);
2880 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2881 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2886 if (a
& CLI_SESS_NOTHROTTLE
)
2888 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2889 throttle_session(s
, 0, 0);
2893 else if (a
& CLI_SESS_THROTTLE
)
2895 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2896 cli_session_actions
[s
].throttle_in
,
2897 cli_session_actions
[s
].throttle_out
);
2899 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2904 if (a
& CLI_SESS_NOFILTER
)
2906 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2907 filter_session(s
, 0, 0);
2911 else if (a
& CLI_SESS_FILTER
)
2913 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2914 cli_session_actions
[s
].filter_in
,
2915 cli_session_actions
[s
].filter_out
);
2917 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2923 cluster_send_session(s
);
2926 // RADIUS interim accounting
2927 if (config
->radius_accounting
&& config
->radius_interim
> 0
2928 && session
[s
].ip
&& !session
[s
].walled_garden
2929 && !sess_local
[s
].radius
// RADIUS already in progress
2930 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2932 int rad
= radiusnew(s
);
2935 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2936 STAT(radius_overflow
);
2940 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2941 session
[s
].user
, session
[s
].unique_id
);
2943 radiussend(rad
, RADIUSINTERIM
);
2944 sess_local
[s
].last_interim
= time_now
;
2949 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
2950 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
2954 // Are we in the middle of a tunnel update, or radius
2957 static int still_busy(void)
2960 static clockt last_talked
= 0;
2961 static clockt start_busy_wait
= 0;
2963 if (!config
->cluster_iam_master
)
2966 static time_t stopped_bgp
= 0;
2971 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
2973 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2974 if (bgp_peers
[i
].state
== Established
)
2975 bgp_stop(&bgp_peers
[i
]);
2977 stopped_bgp
= time_now
;
2979 // we don't want to become master
2980 cluster_send_ping(0);
2985 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
2993 if (main_quit
== QUIT_SHUTDOWN
)
2995 static int dropped
= 0;
3000 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3001 for (i
= 1; i
< MAXTUNNEL
; i
++)
3002 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3003 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3009 if (start_busy_wait
== 0)
3010 start_busy_wait
= TIME
;
3012 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3014 if (!tunnel
[i
].controlc
)
3017 if (last_talked
!= TIME
)
3019 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
3025 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3026 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3028 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3032 for (i
= 1; i
< MAXRADIUS
; i
++)
3034 if (radius
[i
].state
== RADIUSNULL
)
3036 if (radius
[i
].state
== RADIUSWAIT
)
3039 if (last_talked
!= TIME
)
3041 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
3051 # include <sys/epoll.h>
3053 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3054 # include "fake_epoll.h"
3057 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3060 // additional polled fds
3062 # define EXTRA_FDS BGP_NUM_PEERS
3064 # define EXTRA_FDS 0
3067 // main loop - gets packets on tun or udp and processes them
3068 static void mainloop(void)
3072 clockt next_cluster_ping
= 0; // send initial ping immediately
3073 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3074 int maxevent
= sizeof(events
)/sizeof(*events
);
3076 if ((epollfd
= epoll_create(maxevent
)) < 0)
3078 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3082 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3083 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3085 /* setup our fds to poll for input */
3087 static struct event_data d
[BASE_FDS
];
3088 struct epoll_event e
;
3093 d
[i
].type
= FD_TYPE_CLI
;
3094 e
.data
.ptr
= &d
[i
++];
3095 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3097 d
[i
].type
= FD_TYPE_CLUSTER
;
3098 e
.data
.ptr
= &d
[i
++];
3099 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3101 d
[i
].type
= FD_TYPE_TUN
;
3102 e
.data
.ptr
= &d
[i
++];
3103 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3105 d
[i
].type
= FD_TYPE_UDP
;
3106 e
.data
.ptr
= &d
[i
++];
3107 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3109 d
[i
].type
= FD_TYPE_CONTROL
;
3110 e
.data
.ptr
= &d
[i
++];
3111 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3113 d
[i
].type
= FD_TYPE_DAE
;
3114 e
.data
.ptr
= &d
[i
++];
3115 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3119 signal(SIGPIPE
, SIG_IGN
);
3120 bgp_setup(config
->as_number
);
3121 if (config
->bind_address
)
3122 bgp_add_route(config
->bind_address
, 0xffffffff);
3124 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3126 if (config
->neighbour
[i
].name
[0])
3127 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3128 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3129 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3133 while (!main_quit
|| still_busy())
3138 if (config
->reload_config
)
3140 // Update the config state based on config settings
3148 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3149 STAT(select_called
);
3154 if (errno
== EINTR
||
3155 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3158 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3164 struct sockaddr_in addr
;
3169 int cluster_ready
= 0;
3172 int cluster_pkts
= 0;
3174 uint32_t bgp_events
[BGP_NUM_PEERS
];
3175 memset(bgp_events
, 0, sizeof(bgp_events
));
3178 for (c
= n
, i
= 0; i
< c
; i
++)
3180 struct event_data
*d
= events
[i
].data
.ptr
;
3183 case FD_TYPE_CLI
: // CLI connections
3187 alen
= sizeof(addr
);
3188 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3194 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3200 // these are handled below, with multiple interleaved reads
3201 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3202 case FD_TYPE_TUN
: tun_ready
++; break;
3203 case FD_TYPE_UDP
: udp_ready
++; break;
3205 case FD_TYPE_CONTROL
: // nsctl commands
3206 alen
= sizeof(addr
);
3207 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3211 case FD_TYPE_DAE
: // DAE requests
3212 alen
= sizeof(addr
);
3213 processdae(buf
, recvfrom(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3217 case FD_TYPE_RADIUS
: // RADIUS response
3218 s
= recv(radfds
[d
->index
], buf
, sizeof(buf
), 0);
3219 if (s
>= 0 && config
->cluster_iam_master
)
3220 processrad(buf
, s
, d
->index
);
3227 bgp_events
[d
->index
] = events
[i
].events
;
3233 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3238 bgp_process(bgp_events
);
3241 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3246 alen
= sizeof(addr
);
3247 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3249 processudp(buf
, s
, &addr
);
3262 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3277 alen
= sizeof(addr
);
3278 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3280 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3291 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3292 STAT(multi_read_used
);
3294 if (c
>= config
->multi_read_count
)
3296 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3297 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3299 STAT(multi_read_exceeded
);
3304 // Runs on every machine (master and slaves).
3305 if (next_cluster_ping
<= TIME
)
3307 // Check to see which of the cluster is still alive..
3309 cluster_send_ping(basetime
); // Only does anything if we're a slave
3310 cluster_check_master(); // ditto.
3312 cluster_heartbeat(); // Only does anything if we're a master.
3313 cluster_check_slaves(); // ditto.
3315 master_update_counts(); // If we're a slave, send our byte counters to our master.
3317 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3318 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3320 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3323 if (!config
->cluster_iam_master
)
3326 // Run token bucket filtering queue..
3327 // Only run it every 1/10th of a second.
3329 static clockt last_run
= 0;
3330 if (last_run
!= TIME
)
3337 // Handle timeouts, retries etc.
3339 static double last_clean
= 0;
3343 TIME
= now(&this_clean
);
3344 diff
= this_clean
- last_clean
;
3346 // Run during idle time (after we've handled
3347 // all incoming packets) or every 1/10th sec
3348 if (!more
|| diff
> 0.1)
3350 regular_cleanups(diff
);
3351 last_clean
= this_clean
;
3355 if (*config
->accounting_dir
)
3357 static clockt next_acct
= 0;
3358 static clockt next_shut_acct
= 0;
3360 if (next_acct
<= TIME
)
3362 // Dump accounting data
3363 next_acct
= TIME
+ ACCT_TIME
;
3364 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3367 else if (next_shut_acct
<= TIME
)
3369 // Dump accounting data for shutdown sessions
3370 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3377 // Are we the master and shutting down??
3378 if (config
->cluster_iam_master
)
3379 cluster_heartbeat(); // Flush any queued changes..
3381 // Ok. Notify everyone we're shutting down. If we're
3382 // the master, this will force an election.
3383 cluster_send_ping(0);
3386 // Important!!! We MUST not process any packets past this point!
3387 LOG(1, 0, 0, "Shutdown complete\n");
3390 static void stripdomain(char *host
)
3394 if ((p
= strchr(host
, '.')))
3400 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3406 while (fgets(buf
, sizeof(buf
), resolv
))
3408 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3411 if (!isspace(buf
[6]))
3415 while (isspace(*b
)) b
++;
3420 while (*b
&& !isspace(*b
)) b
++;
3422 if (buf
[0] == 'd') // domain is canonical
3428 // first search line
3431 // hold, may be subsequent domain line
3432 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3443 int hl
= strlen(host
);
3444 int dl
= strlen(domain
);
3445 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3446 host
[hl
-dl
- 1] = 0;
3450 *p
= 0; // everything after first dot
3455 // Init data structures
3456 static void initdata(int optdebug
, char *optconfig
)
3460 if (!(config
= shared_malloc(sizeof(configt
))))
3462 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3466 memset(config
, 0, sizeof(configt
));
3467 time(&config
->start_time
);
3468 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3469 config
->debug
= optdebug
;
3470 config
->num_tbfs
= MAXTBFS
;
3471 config
->rl_rate
= 28; // 28kbps
3472 config
->cluster_master_min_adv
= 1;
3473 config
->ppp_restart_time
= 3;
3474 config
->ppp_max_configure
= 10;
3475 config
->ppp_max_failure
= 5;
3476 strcpy(config
->random_device
, RANDOMDEVICE
);
3478 log_stream
= stderr
;
3481 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3483 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3486 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3489 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3491 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3494 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3496 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3499 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3501 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3505 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3507 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3511 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3513 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3517 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3519 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3523 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3525 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3528 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3530 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3532 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3535 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3537 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3539 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3542 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3544 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3545 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3546 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3547 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3549 // Put all the sessions on the free list marked as undefined.
3550 for (i
= 1; i
< MAXSESSION
; i
++)
3552 session
[i
].next
= i
+ 1;
3553 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3555 session
[MAXSESSION
- 1].next
= 0;
3558 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3559 for (i
= 1; i
< MAXTUNNEL
; i
++)
3560 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3564 // Grab my hostname unless it's been specified
3565 gethostname(hostname
, sizeof(hostname
));
3566 stripdomain(hostname
);
3569 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3572 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3574 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3580 static int assign_ip_address(sessionidt s
)
3584 time_t best_time
= time_now
;
3585 char *u
= session
[s
].user
;
3589 CSTAT(assign_ip_address
);
3591 for (i
= 1; i
< ip_pool_size
; i
++)
3593 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3596 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3603 if (ip_address_pool
[i
].last
< best_time
)
3606 if (!(best_time
= ip_address_pool
[i
].last
))
3607 break; // never used, grab this one
3613 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3617 session
[s
].ip
= ip_address_pool
[best
].address
;
3618 session
[s
].ip_pool_index
= best
;
3619 ip_address_pool
[best
].assigned
= 1;
3620 ip_address_pool
[best
].last
= time_now
;
3621 ip_address_pool
[best
].session
= s
;
3622 if (session
[s
].walled_garden
)
3623 /* Don't track addresses of users in walled garden (note: this
3624 means that their address isn't "sticky" even if they get
3626 ip_address_pool
[best
].user
[0] = 0;
3628 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3631 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3632 reuse
? "Reusing" : "Allocating", best
);
3637 static void free_ip_address(sessionidt s
)
3639 int i
= session
[s
].ip_pool_index
;
3642 CSTAT(free_ip_address
);
3645 return; // what the?
3647 if (i
< 0) // Is this actually part of the ip pool?
3651 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3653 ip_address_pool
[i
].assigned
= 0;
3654 ip_address_pool
[i
].session
= 0;
3655 ip_address_pool
[i
].last
= time_now
;
3659 // Fsck the address pool against the session table.
3660 // Normally only called when we become a master.
3662 // This isn't perfect: We aren't keep tracking of which
3663 // users used to have an IP address.
3665 void rebuild_address_pool(void)
3670 // Zero the IP pool allocation, and build
3671 // a map from IP address to pool index.
3672 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3674 ip_address_pool
[i
].assigned
= 0;
3675 ip_address_pool
[i
].session
= 0;
3676 if (!ip_address_pool
[i
].address
)
3679 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3682 for (i
= 0; i
< MAXSESSION
; ++i
)
3685 if (!(session
[i
].opened
&& session
[i
].ip
))
3688 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3690 if (session
[i
].ip_pool_index
< 0)
3692 // Not allocated out of the pool.
3693 if (ipid
< 1) // Not found in the pool either? good.
3696 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3697 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3699 // Fall through and process it as part of the pool.
3703 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3705 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3707 session
[i
].ip_pool_index
= ipid
;
3711 ip_address_pool
[ipid
].assigned
= 1;
3712 ip_address_pool
[ipid
].session
= i
;
3713 ip_address_pool
[ipid
].last
= time_now
;
3714 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3715 session
[i
].ip_pool_index
= ipid
;
3716 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3721 // Fix the address pool to match a changed session.
3722 // (usually when the master sends us an update).
3723 static void fix_address_pool(int sid
)
3727 ipid
= session
[sid
].ip_pool_index
;
3729 if (ipid
> ip_pool_size
)
3730 return; // Ignore it. rebuild_address_pool will fix it up.
3732 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3733 return; // Just ignore it. rebuild_address_pool will take care of it.
3735 ip_address_pool
[ipid
].assigned
= 1;
3736 ip_address_pool
[ipid
].session
= sid
;
3737 ip_address_pool
[ipid
].last
= time_now
;
3738 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3742 // Add a block of addresses to the IP pool to hand out.
3744 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3748 mask
= 0xffffffff; // Host route only.
3752 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3755 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3757 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3758 continue; // Skip 0 and broadcast addresses.
3760 ip_address_pool
[ip_pool_size
].address
= i
;
3761 ip_address_pool
[ip_pool_size
].assigned
= 0;
3763 if (ip_pool_size
>= MAXIPPOOL
)
3765 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3771 // Initialize the IP address pool
3772 static void initippool()
3777 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3779 if (!(f
= fopen(IPPOOLFILE
, "r")))
3781 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3785 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3788 buf
[4095] = 0; // Force it to be zero terminated/
3790 if (*buf
== '#' || *buf
== '\n')
3791 continue; // Skip comments / blank lines
3792 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3793 if ((p
= (char *)strchr(buf
, ':')))
3797 src
= inet_addr(buf
);
3798 if (src
== INADDR_NONE
)
3800 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3803 // This entry is for a specific IP only
3804 if (src
!= config
->bind_address
)
3809 if ((p
= (char *)strchr(pool
, '/')))
3813 in_addr_t start
= 0, mask
= 0;
3815 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3817 if (!*p
|| !(numbits
= atoi(p
)))
3819 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3822 start
= ntohl(inet_addr(pool
));
3823 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3825 // Add a static route for this pool
3826 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3827 fmtaddr(htonl(start
), 0), 32 + mask
);
3829 routeset(0, start
, mask
, 0, 1);
3831 add_to_ip_pool(start
, mask
);
3835 // It's a single ip address
3836 add_to_ip_pool(inet_addr(pool
), 0);
3840 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3843 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3845 struct sockaddr_in snoop_addr
= {0};
3846 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3849 snoop_addr
.sin_family
= AF_INET
;
3850 snoop_addr
.sin_addr
.s_addr
= destination
;
3851 snoop_addr
.sin_port
= ntohs(port
);
3853 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3854 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3855 htons(snoop_addr
.sin_port
));
3857 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3858 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3860 STAT(packets_snooped
);
3863 static int dump_session(FILE **f
, sessiont
*s
)
3865 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
3870 char filename
[1024];
3872 time_t now
= time(NULL
);
3874 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3875 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3877 if (!(*f
= fopen(filename
, "w")))
3879 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3883 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3884 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3889 "# format: username ip qos uptxoctets downrxoctets\n",
3891 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
3896 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3897 fprintf(*f
, "%s %s %d %u %u\n",
3898 s
->user
, // username
3899 fmtaddr(htonl(s
->ip
), 0), // ip
3900 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3901 (uint32_t) s
->cin_delta
, // uptxoctets
3902 (uint32_t) s
->cout_delta
); // downrxoctets
3904 s
->cin_delta
= s
->cout_delta
= 0;
3909 static void dump_acct_info(int all
)
3915 CSTAT(dump_acct_info
);
3919 for (i
= 0; i
< shut_acct_n
; i
++)
3920 dump_session(&f
, &shut_acct
[i
]);
3926 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3927 dump_session(&f
, &session
[i
]);
3934 int main(int argc
, char *argv
[])
3938 char *optconfig
= CONFIGFILE
;
3940 time(&basetime
); // start clock
3943 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3948 if (fork()) exit(0);
3950 freopen("/dev/null", "r", stdin
);
3951 freopen("/dev/null", "w", stdout
);
3952 freopen("/dev/null", "w", stderr
);
3961 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3964 printf("Args are:\n"
3965 "\t-d\t\tDetach from terminal\n"
3966 "\t-c <file>\tConfig file\n"
3967 "\t-h <hostname>\tForce hostname\n"
3975 // Start the timer routine off
3977 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3978 signal(SIGALRM
, sigalrm_handler
);
3979 siginterrupt(SIGALRM
, 0);
3982 initdata(optdebug
, optconfig
);
3986 init_tbf(config
->num_tbfs
);
3988 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3989 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3990 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3993 rlim
.rlim_cur
= RLIM_INFINITY
;
3994 rlim
.rlim_max
= RLIM_INFINITY
;
3995 // Remove the maximum core size
3996 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3997 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3999 // Make core dumps go to /tmp
4003 if (config
->scheduler_fifo
)
4006 struct sched_param params
= {0};
4007 params
.sched_priority
= 1;
4009 if (get_nprocs() < 2)
4011 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4012 config
->scheduler_fifo
= 0;
4016 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4018 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4022 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4023 config
->scheduler_fifo
= 0;
4028 /* Set up the cluster communications port. */
4029 if (cluster_init() < 0)
4033 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4041 unsigned seed
= time_now
^ getpid();
4042 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4046 signal(SIGHUP
, sighup_handler
);
4047 signal(SIGCHLD
, sigchild_handler
);
4048 signal(SIGTERM
, shutdown_handler
);
4049 signal(SIGINT
, shutdown_handler
);
4050 signal(SIGQUIT
, shutdown_handler
);
4052 // Prevent us from getting paged out
4053 if (config
->lock_pages
)
4055 if (!mlockall(MCL_CURRENT
))
4056 LOG(1, 0, 0, "Locking pages into memory\n");
4058 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4063 // Drop privileges here
4064 if (config
->target_uid
> 0 && geteuid() == 0)
4065 setuid(config
->target_uid
);
4069 /* remove plugins (so cleanup code gets run) */
4072 // Remove the PID file if we wrote it
4073 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4074 unlink(config
->pid_file
);
4076 /* kill CLI children */
4077 signal(SIGTERM
, SIG_IGN
);
4082 static void sighup_handler(int sig
)
4086 if (log_stream
!= stderr
)
4095 static void sigalrm_handler(int sig
)
4097 // Log current traffic stats
4099 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4100 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4101 (udp_rx
/ 1024.0 / 1024.0 * 8),
4102 (eth_tx
/ 1024.0 / 1024.0 * 8),
4103 (eth_rx
/ 1024.0 / 1024.0 * 8),
4104 (udp_tx
/ 1024.0 / 1024.0 * 8),
4105 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
4106 udp_rx_pkt
, eth_rx_pkt
);
4108 udp_tx
= udp_rx
= 0;
4109 udp_rx_pkt
= eth_rx_pkt
= 0;
4110 eth_tx
= eth_rx
= 0;
4112 if (config
->dump_speed
)
4113 printf("%s\n", config
->bandwidth
);
4115 // Update the internal time counter
4117 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4122 struct param_timer p
= { time_now
};
4123 run_plugins(PLUGIN_TIMER
, &p
);
4128 static void shutdown_handler(int sig
)
4130 LOG(1, 0, 0, "Shutting down\n");
4131 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4134 static void sigchild_handler(int sig
)
4136 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4140 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4143 *challenge_response
= NULL
;
4145 if (!*config
->l2tpsecret
)
4147 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4151 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4153 *challenge_response
= calloc(17, 1);
4156 MD5_Update(&ctx
, &id
, 1);
4157 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4158 MD5_Update(&ctx
, challenge
, challenge_length
);
4159 MD5_Final(*challenge_response
, &ctx
);
4164 static int facility_value(char *name
)
4167 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4169 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4170 return facilitynames
[i
].c_val
;
4175 static void update_config()
4179 static int timeout
= 0;
4180 static int interval
= 0;
4187 if (log_stream
!= stderr
)
4193 if (*config
->log_filename
)
4195 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4197 char *p
= config
->log_filename
+ 7;
4200 openlog("l2tpns", LOG_PID
, facility_value(p
));
4204 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4206 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4208 fseek(log_stream
, 0, SEEK_END
);
4209 setbuf(log_stream
, NULL
);
4213 log_stream
= stderr
;
4214 setbuf(log_stream
, NULL
);
4220 log_stream
= stderr
;
4221 setbuf(log_stream
, NULL
);
4225 config
->numradiusservers
= 0;
4226 for (i
= 0; i
< MAXRADSERVER
; i
++)
4227 if (config
->radiusserver
[i
])
4229 config
->numradiusservers
++;
4230 // Set radius port: if not set, take the port from the
4231 // first radius server. For the first radius server,
4232 // take the #defined default value from l2tpns.h
4234 // test twice, In case someone works with
4235 // a secondary radius server without defining
4236 // a primary one, this will work even then.
4237 if (i
> 0 && !config
->radiusport
[i
])
4238 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4239 if (!config
->radiusport
[i
])
4240 config
->radiusport
[i
] = RADPORT
;
4243 if (!config
->numradiusservers
)
4244 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4246 // parse radius_authtypes_s
4247 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4248 p
= config
->radius_authtypes_s
;
4251 char *s
= strpbrk(p
, " \t,");
4257 while (*s
== ' ' || *s
== '\t')
4264 if (!strncasecmp("chap", p
, strlen(p
)))
4266 else if (!strncasecmp("pap", p
, strlen(p
)))
4269 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4271 config
->radius_authtypes
|= type
;
4272 if (!config
->radius_authprefer
)
4273 config
->radius_authprefer
= type
;
4278 if (!config
->radius_authtypes
)
4280 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4281 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4284 // normalise radius_authtypes_s
4285 if (config
->radius_authprefer
== AUTHPAP
)
4287 strcpy(config
->radius_authtypes_s
, "pap");
4288 if (config
->radius_authtypes
& AUTHCHAP
)
4289 strcat(config
->radius_authtypes_s
, ", chap");
4293 strcpy(config
->radius_authtypes_s
, "chap");
4294 if (config
->radius_authtypes
& AUTHPAP
)
4295 strcat(config
->radius_authtypes_s
, ", pap");
4298 if (!config
->radius_dae_port
)
4299 config
->radius_dae_port
= DAEPORT
;
4301 // re-initialise the random number source
4302 initrandom(config
->random_device
);
4305 for (i
= 0; i
< MAXPLUGINS
; i
++)
4307 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4310 if (*config
->plugins
[i
])
4313 add_plugin(config
->plugins
[i
]);
4315 else if (*config
->old_plugins
[i
])
4318 remove_plugin(config
->old_plugins
[i
]);
4322 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4323 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4324 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4325 if (!*config
->cluster_interface
)
4326 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4328 if (!config
->cluster_hb_interval
)
4329 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4331 if (!config
->cluster_hb_timeout
)
4332 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4334 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4336 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4337 // late, ensure we're sufficiently larger than that
4338 int t
= 4 * config
->cluster_hb_interval
+ 11;
4340 if (config
->cluster_hb_timeout
< t
)
4342 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4343 config
->cluster_hb_timeout
= t
;
4346 // Push timing changes to the slaves immediately if we're the master
4347 if (config
->cluster_iam_master
)
4348 cluster_heartbeat();
4350 interval
= config
->cluster_hb_interval
;
4351 timeout
= config
->cluster_hb_timeout
;
4355 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4358 if ((f
= fopen(config
->pid_file
, "w")))
4360 fprintf(f
, "%d\n", getpid());
4362 config
->wrote_pid
= 1;
4366 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4370 config
->reload_config
= 0;
4373 static void read_config_file()
4377 if (!config
->config_file
) return;
4378 if (!(f
= fopen(config
->config_file
, "r")))
4380 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4384 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4386 LOG(3, 0, 0, "Done reading config file\n");
4391 int sessionsetup(sessionidt s
, tunnelidt t
)
4393 // A session now exists, set it up
4399 CSTAT(sessionsetup
);
4401 LOG(3, s
, t
, "Doing session setup for session\n");
4405 assign_ip_address(s
);
4408 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4409 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4412 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4413 fmtaddr(htonl(session
[s
].ip
), 0));
4417 // Make sure this is right
4418 session
[s
].tunnel
= t
;
4420 // zap old sessions with same IP and/or username
4421 // Don't kill gardened sessions - doing so leads to a DoS
4422 // from someone who doesn't need to know the password
4425 user
= session
[s
].user
;
4426 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4428 if (i
== s
) continue;
4429 if (!session
[s
].opened
) continue;
4430 if (ip
== session
[i
].ip
)
4432 sessionkill(i
, "Duplicate IP address");
4436 if (config
->allow_duplicate_users
) continue;
4437 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4438 if (!strcasecmp(user
, session
[i
].user
))
4439 sessionkill(i
, "Duplicate session for users");
4446 // Add the route for this session.
4447 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4449 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4450 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4453 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4456 // Static IPs need to be routed if not already
4457 // convered by a Framed-Route. Anything else is part
4458 // of the IP address pool and is already routed, it
4459 // just needs to be added to the IP cache.
4460 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4461 if (session
[s
].ip_pool_index
== -1) // static ip
4463 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4466 cache_ipmap(session
[s
].ip
, s
);
4469 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
4470 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
4472 // Run the plugin's against this new session.
4474 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4475 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4478 // Allocate TBFs if throttled
4479 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4480 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4482 session
[s
].last_packet
= time_now
;
4484 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4485 fmtaddr(htonl(session
[s
].ip
), 0),
4486 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4488 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4490 return 1; // RADIUS OK and IP allocated, done...
4494 // This session just got dropped on us by the master or something.
4495 // Make sure our tables up up to date...
4497 int load_session(sessionidt s
, sessiont
*new)
4503 if (new->ip_pool_index
>= MAXIPPOOL
||
4504 new->tunnel
>= MAXTUNNEL
)
4506 LOG(0, s
, 0, "Strange session update received!\n");
4507 // FIXME! What to do here?
4512 // Ok. All sanity checks passed. Now we're committed to
4513 // loading the new session.
4516 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4518 // See if routes/ip cache need updating
4519 if (new->ip
!= session
[s
].ip
)
4522 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4523 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4524 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4532 // remove old routes...
4533 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4535 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4536 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4539 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4545 if (session
[s
].ip_pool_index
== -1) // static IP
4547 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4549 else // It's part of the IP pool, remove it manually.
4550 uncache_ipmap(session
[s
].ip
);
4555 // add new routes...
4556 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4558 if ((new->ip
& new->route
[i
].mask
) ==
4559 (new->route
[i
].ip
& new->route
[i
].mask
))
4562 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4568 // If there's a new one, add it.
4569 if (new->ip_pool_index
== -1)
4571 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4574 cache_ipmap(new->ip
, s
);
4579 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
4580 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4583 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4585 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4589 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4591 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4592 new->filter_out
= 0;
4595 if (new->filter_in
!= session
[s
].filter_in
)
4597 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4598 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4601 if (new->filter_out
!= session
[s
].filter_out
)
4603 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4604 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4607 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4608 // for walking the sessions to forward byte counts to the master.
4609 config
->cluster_highest_sessionid
= s
;
4611 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4613 // Do fixups into address pool.
4614 if (new->ip_pool_index
!= -1)
4615 fix_address_pool(s
);
4620 static void initplugins()
4624 loaded_plugins
= ll_init();
4625 // Initialize the plugins to nothing
4626 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4627 plugins
[i
] = ll_init();
4630 static void *open_plugin(char *plugin_name
, int load
)
4632 char path
[256] = "";
4634 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4635 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4636 return dlopen(path
, RTLD_NOW
);
4639 // plugin callback to get a config value
4640 static void *getconfig(char *key
, enum config_typet type
)
4644 for (i
= 0; config_values
[i
].key
; i
++)
4646 if (!strcmp(config_values
[i
].key
, key
))
4648 if (config_values
[i
].type
== type
)
4649 return ((void *) config
) + config_values
[i
].offset
;
4651 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4652 key
, type
, config_values
[i
].type
);
4658 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4662 static int add_plugin(char *plugin_name
)
4664 static struct pluginfuncs funcs
= {
4669 sessiontbysessionidt
,
4670 sessionidtbysessiont
,
4677 cluster_send_session
,
4680 void *p
= open_plugin(plugin_name
, 1);
4681 int (*initfunc
)(struct pluginfuncs
*);
4686 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4690 if (ll_contains(loaded_plugins
, p
))
4693 return 0; // already loaded
4697 int *v
= dlsym(p
, "plugin_api_version");
4698 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4700 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4706 if ((initfunc
= dlsym(p
, "plugin_init")))
4708 if (!initfunc(&funcs
))
4710 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4716 ll_push(loaded_plugins
, p
);
4718 for (i
= 0; i
< max_plugin_functions
; i
++)
4721 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4723 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4724 ll_push(plugins
[i
], x
);
4728 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4732 static void run_plugin_done(void *plugin
)
4734 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4740 static int remove_plugin(char *plugin_name
)
4742 void *p
= open_plugin(plugin_name
, 0);
4748 if (ll_contains(loaded_plugins
, p
))
4751 for (i
= 0; i
< max_plugin_functions
; i
++)
4754 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4755 ll_delete(plugins
[i
], x
);
4758 ll_delete(loaded_plugins
, p
);
4764 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4768 int run_plugins(int plugin_type
, void *data
)
4770 int (*func
)(void *data
);
4772 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4773 return PLUGIN_RET_ERROR
;
4775 ll_reset(plugins
[plugin_type
]);
4776 while ((func
= ll_next(plugins
[plugin_type
])))
4780 if (r
!= PLUGIN_RET_OK
)
4781 return r
; // stop here
4784 return PLUGIN_RET_OK
;
4787 static void plugins_done()
4791 ll_reset(loaded_plugins
);
4792 while ((p
= ll_next(loaded_plugins
)))
4796 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4798 struct nsctl request
;
4799 struct nsctl response
;
4800 int type
= unpack_control(&request
, buf
, len
);
4804 if (log_stream
&& config
->debug
>= 4)
4808 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4809 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4813 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4814 dump_control(&request
, log_stream
);
4820 case NSCTL_REQ_LOAD
:
4821 if (request
.argc
!= 1)
4823 response
.type
= NSCTL_RES_ERR
;
4825 response
.argv
[0] = "name of plugin required";
4827 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4829 response
.type
= NSCTL_RES_ERR
;
4831 response
.argv
[0] = !r
4832 ? "plugin already loaded"
4833 : "error loading plugin";
4837 response
.type
= NSCTL_RES_OK
;
4843 case NSCTL_REQ_UNLOAD
:
4844 if (request
.argc
!= 1)
4846 response
.type
= NSCTL_RES_ERR
;
4848 response
.argv
[0] = "name of plugin required";
4850 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4852 response
.type
= NSCTL_RES_ERR
;
4854 response
.argv
[0] = !r
4855 ? "plugin not loaded"
4856 : "plugin not found";
4860 response
.type
= NSCTL_RES_OK
;
4866 case NSCTL_REQ_HELP
:
4867 response
.type
= NSCTL_RES_OK
;
4870 ll_reset(loaded_plugins
);
4871 while ((p
= ll_next(loaded_plugins
)))
4873 char **help
= dlsym(p
, "plugin_control_help");
4874 while (response
.argc
< 0xff && help
&& *help
)
4875 response
.argv
[response
.argc
++] = *help
++;
4880 case NSCTL_REQ_CONTROL
:
4882 struct param_control param
= {
4883 config
->cluster_iam_master
,
4890 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4892 if (r
== PLUGIN_RET_ERROR
)
4894 response
.type
= NSCTL_RES_ERR
;
4896 response
.argv
[0] = param
.additional
4898 : "error returned by plugin";
4900 else if (r
== PLUGIN_RET_NOTMASTER
)
4902 static char msg
[] = "must be run on master: 000.000.000.000";
4904 response
.type
= NSCTL_RES_ERR
;
4906 if (config
->cluster_master_address
)
4908 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4909 response
.argv
[0] = msg
;
4913 response
.argv
[0] = "must be run on master: none elected";
4916 else if (!(param
.response
& NSCTL_RESPONSE
))
4918 response
.type
= NSCTL_RES_ERR
;
4920 response
.argv
[0] = param
.response
4921 ? "unrecognised response value from plugin"
4922 : "unhandled action";
4926 response
.type
= param
.response
;
4928 if (param
.additional
)
4931 response
.argv
[0] = param
.additional
;
4939 response
.type
= NSCTL_RES_ERR
;
4941 response
.argv
[0] = "error unpacking control packet";
4944 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4947 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4951 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4954 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4955 if (log_stream
&& config
->debug
>= 4)
4957 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4958 dump_control(&response
, log_stream
);
4962 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4963 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4968 static tunnelidt
new_tunnel()
4971 for (i
= 1; i
< MAXTUNNEL
; i
++)
4973 if (tunnel
[i
].state
== TUNNELFREE
)
4975 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4976 if (i
> config
->cluster_highest_tunnelid
)
4977 config
->cluster_highest_tunnelid
= i
;
4981 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4986 // We're becoming the master. Do any required setup..
4988 // This is principally telling all the plugins that we're
4989 // now a master, and telling them about all the sessions
4990 // that are active too..
4992 void become_master(void)
4995 static struct event_data d
[RADIUS_FDS
];
4996 struct epoll_event e
;
4998 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
5000 // running a bunch of iptables commands is slow and can cause
5001 // the master to drop tunnels on takeover--kludge around the
5002 // problem by forking for the moment (note: race)
5003 if (!fork_and_close())
5005 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5007 if (!session
[s
].opened
) // Not an in-use session.
5010 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5017 for (i
= 0; i
< RADIUS_FDS
; i
++)
5019 d
[i
].type
= FD_TYPE_RADIUS
;
5023 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5027 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5033 if (CLI_HELP_REQUESTED
)
5034 return CLI_HELP_NO_ARGS
;
5037 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5039 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5042 if (!session
[s
].opened
)
5045 idle
= time_now
- session
[s
].last_packet
;
5046 idle
/= 5 ; // In multiples of 5 seconds.
5056 for (i
= 0; i
< 63; ++i
)
5058 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5060 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5061 cli_print(cli
, "%d total sessions open.", count
);
5065 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5071 if (CLI_HELP_REQUESTED
)
5072 return CLI_HELP_NO_ARGS
;
5075 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5077 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5080 if (!session
[s
].opened
)
5083 d
= time_now
- session
[s
].opened
;
5086 while (d
> 1 && open
< 32)
5096 for (i
= 0; i
< 30; ++i
)
5098 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5101 cli_print(cli
, "%d total sessions open.", count
);
5107 * This unencodes the AVP using the L2TP secret and the previously
5108 * stored random vector. It overwrites the hidden data with the
5109 * unhidden AVP subformat.
5111 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5117 uint16_t m
= htons(type
);
5119 // Compute initial pad
5121 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5122 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5123 MD5_Update(&ctx
, vector
, vec_len
);
5124 MD5_Final(digest
, &ctx
);
5126 // pointer to last decoded 16 octets
5131 // calculate a new pad based on the last decoded block
5132 if (d
>= sizeof(digest
))
5135 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5136 MD5_Update(&ctx
, last
, sizeof(digest
));
5137 MD5_Final(digest
, &ctx
);
5143 *value
++ ^= digest
[d
++];
5148 int find_filter(char const *name
, size_t len
)
5153 for (i
= 0; i
< MAXFILTER
; i
++)
5155 if (!*ip_filters
[i
].name
)
5163 if (strlen(ip_filters
[i
].name
) != len
)
5166 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5173 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5177 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5178 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5179 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5180 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5181 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5187 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5191 case FILTER_FLAG_OP_ANY
:
5192 return (flags
& sflags
) || (~flags
& cflags
);
5194 case FILTER_FLAG_OP_ALL
:
5195 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5197 case FILTER_FLAG_OP_EST
:
5198 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5204 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5206 uint16_t frag_offset
;
5210 uint16_t src_port
= 0;
5211 uint16_t dst_port
= 0;
5213 ip_filter_rulet
*rule
;
5215 if (len
< 20) // up to end of destination address
5218 if ((*buf
>> 4) != 4) // IPv4
5221 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5223 src_ip
= *(in_addr_t
*) (buf
+ 12);
5224 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5226 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5228 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5229 if (len
< l
+ 4) // ports
5232 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5233 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5234 if (proto
== IPPROTO_TCP
)
5236 if (len
< l
+ 14) // flags
5239 flags
= buf
[l
+ 13] & 0x3f;
5243 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5245 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5248 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5249 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5252 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5253 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5258 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5266 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5268 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5271 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5274 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5275 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5282 return rule
->action
== FILTER_ACTION_PERMIT
;