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 1.116 2005/08/10 07:25:24 bodea Exp $";
13 #include <linux/if_tun.h>
18 #include <net/route.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
32 #include <sys/resource.h>
40 #include <sys/sysinfo.h>
48 #include "constants.h"
58 configt
*config
= NULL
; // all configuration
59 int tunfd
= -1; // tun interface file handle. (network device)
60 int udpfd
= -1; // UDP file handle
61 int controlfd
= -1; // Control signal handle
62 int clifd
= -1; // Socket listening for CLI connections.
63 int daefd
= -1; // Socket listening for DAE connections.
64 int snoopfd
= -1; // UDP file handle for sending out intercept data
65 int *radfds
= NULL
; // RADIUS requests file handles
66 int ifrfd
= -1; // File descriptor for routing, etc
67 int ifr6fd
= -1; // File descriptor for IPv6 routing, etc
68 int rand_fd
= -1; // Random data source
69 int cluster_sockfd
= -1; // Intra-cluster communications socket.
70 int epollfd
= -1; // event polling
71 time_t basetime
= 0; // base clock
72 char hostname
[1000] = ""; // us.
73 static int tunidx
; // ifr_ifindex of tun device
74 static int syslog_log
= 0; // are we logging to syslog
75 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id
= 0; // Unique ID for radius accounting
78 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
79 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
81 static void *ip_hash
[256]; // Mapping from IP address to session structures.
84 struct ipv6radix
*branch
;
85 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
88 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
89 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
92 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
93 time_t time_now
= 0; // Current time in seconds since epoch.
94 static char time_now_string
[64] = {0}; // Current time as a string.
95 char main_quit
= 0; // True if we're in the process of exiting.
96 linked_list
*loaded_plugins
;
97 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
99 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
100 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
102 config_descriptt config_values
[] = {
103 CONFIG("debug", debug
, INT
),
104 CONFIG("log_file", log_filename
, STRING
),
105 CONFIG("pid_file", pid_file
, STRING
),
106 CONFIG("random_device", random_device
, STRING
),
107 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
108 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
109 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
110 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
111 CONFIG("primary_dns", default_dns1
, IPv4
),
112 CONFIG("secondary_dns", default_dns2
, IPv4
),
113 CONFIG("primary_radius", radiusserver
[0], IPv4
),
114 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
115 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
116 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
117 CONFIG("radius_accounting", radius_accounting
, BOOL
),
118 CONFIG("radius_interim", radius_interim
, INT
),
119 CONFIG("radius_secret", radiussecret
, STRING
),
120 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
121 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
122 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
123 CONFIG("bind_address", bind_address
, IPv4
),
124 CONFIG("peer_address", peer_address
, IPv4
),
125 CONFIG("send_garp", send_garp
, BOOL
),
126 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
127 CONFIG("throttle_buckets", num_tbfs
, INT
),
128 CONFIG("accounting_dir", accounting_dir
, STRING
),
129 CONFIG("setuid", target_uid
, INT
),
130 CONFIG("dump_speed", dump_speed
, BOOL
),
131 CONFIG("multi_read_count", multi_read_count
, INT
),
132 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
133 CONFIG("lock_pages", lock_pages
, BOOL
),
134 CONFIG("icmp_rate", icmp_rate
, INT
),
135 CONFIG("packet_limit", max_packets
, INT
),
136 CONFIG("cluster_address", cluster_address
, IPv4
),
137 CONFIG("cluster_interface", cluster_interface
, STRING
),
138 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
139 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
140 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
141 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
145 static char *plugin_functions
[] = {
152 "plugin_new_session",
153 "plugin_kill_session",
155 "plugin_radius_response",
156 "plugin_radius_reset",
157 "plugin_become_master",
158 "plugin_new_session_master",
161 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
163 // Counters for shutdown sessions
164 static sessiont shut_acct
[8192];
165 static sessionidt shut_acct_n
= 0;
167 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
168 sessiont
*session
= NULL
; // Array of session structures.
169 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
170 radiust
*radius
= NULL
; // Array of radius structures.
171 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
172 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
173 static controlt
*controlfree
= 0;
174 struct Tstats
*_statistics
= NULL
;
176 struct Tringbuffer
*ringbuffer
= NULL
;
179 static void cache_ipmap(in_addr_t ip
, int s
);
180 static void uncache_ipmap(in_addr_t ip
);
181 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
182 static void free_ip_address(sessionidt s
);
183 static void dump_acct_info(int all
);
184 static void sighup_handler(int sig
);
185 static void sigalrm_handler(int sig
);
186 static void shutdown_handler(int sig
);
187 static void sigchild_handler(int sig
);
188 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
189 static void update_config(void);
190 static void read_config_file(void);
191 static void initplugins(void);
192 static int add_plugin(char *plugin_name
);
193 static int remove_plugin(char *plugin_name
);
194 static void plugins_done(void);
195 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
196 static tunnelidt
new_tunnel(void);
197 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
199 // on slaves, alow BGP to withdraw cleanly before exiting
202 // quit actions (master)
203 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
204 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
206 // return internal time (10ths since process startup), set f if given
207 static clockt
now(double *f
)
211 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
212 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
215 // work out a retry time based on try number
216 // This is a straight bounded exponential backoff.
217 // Maximum re-try time is 32 seconds. (2^5).
218 clockt
backoff(uint8_t try)
220 if (try > 5) try = 5; // max backoff
221 return now(NULL
) + 10 * (1 << try);
226 // Log a debug message. Typically called via the LOG macro
228 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
230 static char message
[65536] = {0};
236 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
237 ringbuffer
->tail
= 0;
238 if (ringbuffer
->tail
== ringbuffer
->head
)
239 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
240 ringbuffer
->head
= 0;
242 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
243 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
244 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
245 va_start(ap
, format
);
246 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
251 if (config
->debug
< level
) return;
253 va_start(ap
, format
);
254 vsnprintf(message
, sizeof(message
), format
, ap
);
257 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
259 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
264 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
267 const uint8_t *d
= data
;
269 if (config
->debug
< level
) return;
271 // No support for _log_hex to syslog
274 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
275 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
277 for (i
= 0; i
< maxsize
; )
279 fprintf(log_stream
, "%4X: ", i
);
280 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
282 fprintf(log_stream
, "%02X ", d
[j
]);
284 fputs(": ", log_stream
);
287 for (; j
< i
+ 16; j
++)
289 fputs(" ", log_stream
);
291 fputs(": ", log_stream
);
294 fputs(" ", log_stream
);
295 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
297 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
298 fputc(d
[j
], log_stream
);
300 fputc('.', log_stream
);
303 fputs(" ", log_stream
);
307 fputs("\n", log_stream
);
311 setbuf(log_stream
, NULL
);
315 // update a counter, accumulating 2^32 wraps
316 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
318 uint32_t new = *counter
+ delta
;
325 // initialise the random generator
326 static void initrandom(char *source
)
328 static char path
[sizeof(config
->random_device
)] = "*undefined*";
330 // reinitialise only if we are forced to do so or if the config has changed
331 if (source
&& !strncmp(path
, source
, sizeof(path
)))
334 // close previous source, if any
343 snprintf(path
, sizeof(path
), "%s", source
);
347 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
349 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
350 path
, strerror(errno
));
355 // fill buffer with random data
356 void random_data(uint8_t *buf
, int len
)
363 n
= read(rand_fd
, buf
, len
);
364 if (n
>= len
) return;
369 LOG(0, 0, 0, "Error reading from random source: %s\n",
372 // fall back to rand()
380 // append missing data
382 // not using the low order bits from the prng stream
383 buf
[n
++] = (rand() >> 4) & 0xff;
388 // This adds it to the routing table, advertises it
389 // via BGP if enabled, and stuffs it into the
390 // 'sessionbyip' cache.
392 // 'ip' and 'mask' must be in _host_ order.
394 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
399 if (!mask
) mask
= 0xffffffff;
401 ip
&= mask
; // Force the ip to be the first one in the route.
403 memset(&r
, 0, sizeof(r
));
404 r
.rt_dev
= config
->tundevice
;
405 r
.rt_dst
.sa_family
= AF_INET
;
406 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
407 r
.rt_gateway
.sa_family
= AF_INET
;
408 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
409 r
.rt_genmask
.sa_family
= AF_INET
;
410 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
411 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
413 r
.rt_flags
|= RTF_GATEWAY
;
414 else if (mask
== 0xffffffff)
415 r
.rt_flags
|= RTF_HOST
;
417 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
418 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
419 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
421 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
422 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
426 bgp_add_route(htonl(ip
), htonl(mask
));
428 bgp_del_route(htonl(ip
), htonl(mask
));
431 // Add/Remove the IPs to the 'sessionbyip' cache.
432 // Note that we add the zero address in the case of
433 // a network route. Roll on CIDR.
435 // Note that 's == 0' implies this is the address pool.
436 // We still cache it here, because it will pre-fill
437 // the malloc'ed tree.
441 if (!add
) // Are we deleting a route?
442 s
= 0; // Caching the session as '0' is the same as uncaching.
444 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
449 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
452 char ipv6addr
[INET6_ADDRSTRLEN
];
456 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
460 memset(&rt
, 0, sizeof(rt
));
462 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
463 rt
.rtmsg_dst_len
= prefixlen
;
465 rt
.rtmsg_flags
= RTF_UP
;
466 rt
.rtmsg_ifindex
= tunidx
;
468 LOG(1, 0, 0, "Route %s %s/%d\n",
470 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
473 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
474 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
477 // FIXME: need to add BGP routing (RFC2858)
481 if (!add
) // Are we deleting a route?
482 s
= 0; // Caching the session as '0' is the same as uncaching.
484 cache_ipv6map(ip
, prefixlen
, s
);
490 // defined in linux/ipv6.h, but tricky to include from user-space
491 // TODO: move routing to use netlink rather than ioctl
493 struct in6_addr ifr6_addr
;
494 __u32 ifr6_prefixlen
;
495 unsigned int ifr6_ifindex
;
499 // Set up TUN interface
500 static void inittun(void)
503 struct in6_ifreq ifr6
;
504 struct sockaddr_in sin
= {0};
505 memset(&ifr
, 0, sizeof(ifr
));
506 ifr
.ifr_flags
= IFF_TUN
;
508 tunfd
= open(TUNDEVICE
, O_RDWR
);
511 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
515 int flags
= fcntl(tunfd
, F_GETFL
, 0);
516 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
518 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
520 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
523 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
524 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
525 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
527 sin
.sin_family
= AF_INET
;
528 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
529 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
531 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
533 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
536 /* Bump up the qlen to deal with bursts from the network */
538 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
540 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
543 ifr
.ifr_flags
= IFF_UP
;
544 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
546 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
549 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
551 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
554 tunidx
= ifr
.ifr_ifindex
;
556 // Only setup IPv6 on the tun device if we have a configured prefix
557 if (config
->ipv6_prefix
.s6_addr
[0]) {
558 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
560 // Link local address is FE80::1
561 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
562 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
563 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
564 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
565 ifr6
.ifr6_prefixlen
= 64;
566 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
567 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
569 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
570 " %s\n", strerror(errno
));
573 // Global address is prefix::1
574 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
575 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
576 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
577 ifr6
.ifr6_prefixlen
= 64;
578 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
579 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
581 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
588 static void initudp(void)
591 struct sockaddr_in addr
;
594 memset(&addr
, 0, sizeof(addr
));
595 addr
.sin_family
= AF_INET
;
596 addr
.sin_port
= htons(L2TPPORT
);
597 addr
.sin_addr
.s_addr
= config
->bind_address
;
598 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
599 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
601 int flags
= fcntl(udpfd
, F_GETFL
, 0);
602 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
604 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
606 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
611 memset(&addr
, 0, sizeof(addr
));
612 addr
.sin_family
= AF_INET
;
613 addr
.sin_port
= htons(NSCTL_PORT
);
614 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
615 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
616 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
618 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
622 // Dynamic Authorization Extensions to RADIUS
623 memset(&addr
, 0, sizeof(addr
));
624 addr
.sin_family
= AF_INET
;
625 addr
.sin_port
= htons(config
->radius_dae_port
);
626 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
627 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
628 if (bind(daefd
, (void *) &addr
, sizeof(addr
)) < 0)
630 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
635 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
639 // Find session by IP, < 1 for not found
641 // Confusingly enough, this 'ip' must be
642 // in _network_ order. This being the common
643 // case when looking it up from IP packet headers.
645 // We actually use this cache for two things.
646 // #1. For used IP addresses, this maps to the
647 // session ID that it's used by.
648 // #2. For un-used IP addresses, this maps to the
649 // index into the pool table that contains that
653 static int lookup_ipmap(in_addr_t ip
)
655 uint8_t *a
= (uint8_t *) &ip
;
656 uint8_t **d
= (uint8_t **) ip_hash
;
658 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
659 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
660 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
662 return (int) (intptr_t) d
[(size_t) *a
];
665 static int lookup_ipv6map(struct in6_addr ip
)
667 struct ipv6radix
*curnode
;
670 char ipv6addr
[INET6_ADDRSTRLEN
];
672 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
676 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
678 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
683 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
684 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
691 sessionidt
sessionbyip(in_addr_t ip
)
693 int s
= lookup_ipmap(ip
);
696 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
697 return (sessionidt
) s
;
702 sessionidt
sessionbyipv6(struct in6_addr ip
)
705 CSTAT(sessionbyipv6
);
707 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
708 (ip
.s6_addr
[0] == 0xFE &&
709 ip
.s6_addr
[1] == 0x80 &&
710 ip
.s6_addr16
[1] == 0 &&
711 ip
.s6_addr16
[2] == 0 &&
712 ip
.s6_addr16
[3] == 0)) {
713 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
715 s
= lookup_ipv6map(ip
);
718 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
725 // Take an IP address in HOST byte order and
726 // add it to the sessionid by IP cache.
728 // (It's actually cached in network order)
730 static void cache_ipmap(in_addr_t ip
, int s
)
732 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
733 uint8_t *a
= (uint8_t *) &nip
;
734 uint8_t **d
= (uint8_t **) ip_hash
;
737 for (i
= 0; i
< 3; i
++)
739 if (!d
[(size_t) a
[i
]])
741 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
745 d
= (uint8_t **) d
[(size_t) a
[i
]];
748 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
751 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
754 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
755 // else a map to an ip pool index.
758 static void uncache_ipmap(in_addr_t ip
)
760 cache_ipmap(ip
, 0); // Assign it to the NULL session.
763 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
767 struct ipv6radix
*curnode
;
768 char ipv6addr
[INET6_ADDRSTRLEN
];
770 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
772 bytes
= prefixlen
>> 3;
775 if (curnode
->branch
== NULL
)
777 if (!(curnode
->branch
= calloc(256,
778 sizeof (struct ipv6radix
))))
781 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
788 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
789 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
793 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
794 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
800 // CLI list to dump current ipcache.
802 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
804 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
808 if (CLI_HELP_REQUESTED
)
809 return CLI_HELP_NO_ARGS
;
811 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
813 for (i
= 0; i
< 256; ++i
)
818 for (j
= 0; j
< 256; ++j
)
823 for (k
= 0; k
< 256; ++k
)
828 for (l
= 0; l
< 256; ++l
)
832 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
838 cli_print(cli
, "%d entries in cache", count
);
843 // Find session by username, 0 for not found
844 // walled garden users aren't authenticated, so the username is
845 // reasonably useless. Ignore them to avoid incorrect actions
847 // This is VERY inefficent. Don't call it often. :)
849 sessionidt
sessionbyuser(char *username
)
852 CSTAT(sessionbyuser
);
854 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
856 if (!session
[s
].opened
)
859 if (session
[s
].walled_garden
)
860 continue; // Skip walled garden users.
862 if (!strncmp(session
[s
].user
, username
, 128))
866 return 0; // Not found.
869 void send_garp(in_addr_t ip
)
875 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
878 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
881 memset(&ifr
, 0, sizeof(ifr
));
882 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
883 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
885 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
889 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
890 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
892 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
897 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
900 static sessiont
*sessiontbysessionidt(sessionidt s
)
902 if (!s
|| s
>= MAXSESSION
) return NULL
;
906 static sessionidt
sessionidtbysessiont(sessiont
*s
)
908 sessionidt val
= s
-session
;
909 if (s
< session
|| val
>= MAXSESSION
) return 0;
913 // actually send a control message for a specific tunnel
914 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
916 struct sockaddr_in addr
;
922 static int backtrace_count
= 0;
923 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
924 STAT(tunnel_tx_errors
);
925 log_backtrace(backtrace_count
, 5)
931 static int backtrace_count
= 0;
932 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
933 log_backtrace(backtrace_count
, 5)
934 STAT(tunnel_tx_errors
);
938 memset(&addr
, 0, sizeof(addr
));
939 addr
.sin_family
= AF_INET
;
940 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
941 addr
.sin_port
= htons(tunnel
[t
].port
);
943 // sequence expected, if sequence in message
944 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
946 // If this is a control message, deal with retries
949 tunnel
[t
].last
= time_now
; // control message sent
950 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
951 if (tunnel
[t
].try > 1)
953 STAT(tunnel_retries
);
954 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
958 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
960 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
961 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
962 STAT(tunnel_tx_errors
);
966 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
967 STAT(tunnel_tx_packets
);
968 INC_STAT(tunnel_tx_bytes
, l
);
972 // Tiny helper function to write data to
975 int tun_write(uint8_t * data
, int size
)
977 return write(tunfd
, data
, size
);
980 // process outgoing (to tunnel) IP
982 static void processipout(uint8_t *buf
, int len
)
989 uint8_t *data
= buf
; // Keep a copy of the originals.
992 uint8_t b
[MAXETHER
+ 20];
996 if (len
< MIN_IP_SIZE
)
998 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1002 if (len
>= MAXETHER
)
1004 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1005 STAT(tun_rx_errors
);
1009 // Skip the tun header
1013 // Got an IP header now
1014 if (*(uint8_t *)(buf
) >> 4 != 4)
1016 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1020 ip
= *(uint32_t *)(buf
+ 16);
1021 if (!(s
= sessionbyip(ip
)))
1023 // Is this a packet for a session that doesn't exist?
1024 static int rate
= 0; // Number of ICMP packets we've sent this second.
1025 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1027 if (last
!= time_now
)
1033 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1035 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1036 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1037 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1041 t
= session
[s
].tunnel
;
1044 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1045 if (config
->max_packets
> 0)
1047 if (sess_local
[s
].last_packet_out
== TIME
)
1049 int max
= config
->max_packets
;
1051 // All packets for throttled sessions are handled by the
1052 // master, so further limit by using the throttle rate.
1053 // A bit of a kludge, since throttle rate is in kbps,
1054 // but should still be generous given our average DSL
1055 // packet size is 200 bytes: a limit of 28kbps equates
1056 // to around 180 packets per second.
1057 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1058 max
= sp
->throttle_out
;
1060 if (++sess_local
[s
].packets_out
> max
)
1062 sess_local
[s
].packets_dropped
++;
1068 if (sess_local
[s
].packets_dropped
)
1070 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1071 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1072 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1073 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1077 sess_local
[s
].last_packet_out
= TIME
;
1078 sess_local
[s
].packets_out
= 1;
1079 sess_local
[s
].packets_dropped
= 0;
1083 // run access-list if any
1084 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1089 // Are we throttling this session?
1090 if (config
->cluster_iam_master
)
1091 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1093 master_throttle_packet(sp
->tbf_out
, data
, size
);
1096 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1098 // We are walled-gardening this
1099 master_garden_packet(s
, data
, size
);
1103 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1105 // Add on L2TP header
1107 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, 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
, t
, s
, 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
, t
, s
, 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
, tunnelidt t
, sessionidt far
)
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
].tunnel
, session
[s
].far
); // 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(tunnelidt t
, sessionidt s
)
1583 uint8_t buf
[MAXCONTROL
];
1588 if (!session
[s
].unique_id
)
1590 if (!++last_id
) ++last_id
; // skip zero
1591 session
[s
].unique_id
= last_id
;
1594 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1598 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
1599 *(uint16_t *) (q
+ 2) = htons(10); // packet length
1600 q
[4] = 3; // ip address option
1601 q
[5] = 6; // option length
1602 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1603 config
->bind_address
? config
->bind_address
:
1604 my_address
; // send my IP
1606 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1609 void sendipv6cp(tunnelidt t
, sessionidt s
)
1611 uint8_t buf
[MAXCONTROL
];
1616 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1620 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
1621 // only send one type
1623 *(uint16_t *) (q
+ 2) = htons(14);
1624 q
[4] = 1; // interface identifier option
1625 q
[5] = 10; // option length
1626 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1627 *(uint32_t *) (q
+ 10) = 0;
1630 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1633 static void sessionclear(sessionidt s
)
1635 memset(&session
[s
], 0, sizeof(session
[s
]));
1636 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1637 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1639 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1640 session
[s
].next
= sessionfree
;
1644 // kill a session now
1645 void sessionkill(sessionidt s
, char *reason
)
1650 if (!session
[s
].opened
) // not alive
1653 if (session
[s
].next
)
1655 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1659 session
[s
].die
= TIME
;
1660 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1661 if (sess_local
[s
].radius
)
1662 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1664 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1666 cluster_send_session(s
);
1669 static void tunnelclear(tunnelidt t
)
1672 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1673 tunnel
[t
].state
= TUNNELFREE
;
1676 // kill a tunnel now
1677 static void tunnelkill(tunnelidt t
, char *reason
)
1684 tunnel
[t
].state
= TUNNELDIE
;
1686 // free control messages
1687 while ((c
= tunnel
[t
].controls
))
1689 controlt
* n
= c
->next
;
1690 tunnel
[t
].controls
= n
;
1691 tunnel
[t
].controlc
--;
1692 c
->next
= controlfree
;
1696 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1697 if (session
[s
].tunnel
== t
)
1698 sessionkill(s
, reason
);
1702 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1703 cli_tunnel_actions
[t
].action
= 0;
1704 cluster_send_tunnel(t
);
1707 // shut down a tunnel cleanly
1708 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1712 CSTAT(tunnelshutdown
);
1714 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1716 // never set up, can immediately kill
1717 tunnelkill(t
, reason
);
1720 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1723 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1724 if (session
[s
].tunnel
== t
)
1725 sessionshutdown(s
, reason
, 0, 0);
1727 tunnel
[t
].state
= TUNNELDIE
;
1728 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1729 cluster_send_tunnel(t
);
1730 // TBA - should we wait for sessions to stop?
1733 controlt
*c
= controlnew(4); // sending StopCCN
1738 *(uint16_t *) buf
= htons(result
);
1739 *(uint16_t *) (buf
+2) = htons(error
);
1742 int m
= strlen(msg
);
1743 if (m
+ 4 > sizeof(buf
))
1744 m
= sizeof(buf
) - 4;
1746 memcpy(buf
+4, msg
, m
);
1750 controlb(c
, 1, buf
, l
, 1);
1753 control16(c
, 1, result
, 1);
1755 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1756 controladd(c
, t
, 0); // send the message
1760 // read and process packet on tunnel (UDP)
1761 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
1763 uint8_t *chapresponse
= NULL
;
1764 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1765 uint8_t *p
= buf
+ 2;
1772 LOG_HEX(5, "UDP Data", buf
, len
);
1773 STAT(tunnel_rx_packets
);
1774 INC_STAT(tunnel_rx_bytes
, len
);
1777 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1778 STAT(tunnel_rx_errors
);
1781 if ((buf
[1] & 0x0F) != 2)
1783 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1784 STAT(tunnel_rx_errors
);
1789 l
= ntohs(*(uint16_t *) p
);
1792 t
= ntohs(*(uint16_t *) p
);
1794 s
= ntohs(*(uint16_t *) p
);
1796 if (s
>= MAXSESSION
)
1798 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1799 STAT(tunnel_rx_errors
);
1804 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1805 STAT(tunnel_rx_errors
);
1810 ns
= ntohs(*(uint16_t *) p
);
1812 nr
= ntohs(*(uint16_t *) p
);
1817 uint16_t o
= ntohs(*(uint16_t *) p
);
1822 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1823 STAT(tunnel_rx_errors
);
1829 uint16_t message
= 0xFFFF; // message type
1831 uint8_t mandatory
= 0;
1832 uint8_t authtype
= 0; // proxy auth type
1833 uint16_t asession
= 0; // assigned session
1834 uint32_t amagic
= 0; // magic number
1835 uint8_t aflags
= 0; // flags from last LCF
1836 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1837 char called
[MAXTEL
] = ""; // called number
1838 char calling
[MAXTEL
] = ""; // calling number
1840 if (!config
->cluster_iam_master
)
1842 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1846 // control messages must have bits 0x80|0x40|0x08
1847 // (type, length and sequence) set, and bits 0x02|0x01
1848 // (offset and priority) clear
1849 if ((*buf
& 0xCB) != 0xC8)
1851 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1852 STAT(tunnel_rx_errors
);
1856 // check for duplicate tunnel open message
1862 // Is this a duplicate of the first packet? (SCCRQ)
1864 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1866 if (tunnel
[i
].state
!= TUNNELOPENING
||
1867 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1868 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1871 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1876 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1877 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1879 // if no tunnel specified, assign one
1882 if (!(t
= new_tunnel()))
1884 LOG(1, 0, 0, "No more tunnels\n");
1885 STAT(tunnel_overflow
);
1889 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1890 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1891 tunnel
[t
].window
= 4; // default window
1892 STAT(tunnel_created
);
1893 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1894 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1897 // If the 'ns' just received is not the 'nr' we're
1898 // expecting, just send an ack and drop it.
1900 // if 'ns' is less, then we got a retransmitted packet.
1901 // if 'ns' is greater than missed a packet. Either way
1902 // we should ignore it.
1903 if (ns
!= tunnel
[t
].nr
)
1905 // is this the sequence we were expecting?
1906 STAT(tunnel_rx_errors
);
1907 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1908 t
, ns
, tunnel
[t
].nr
);
1910 if (l
) // Is this not a ZLB?
1915 // This is used to time out old tunnels
1916 tunnel
[t
].lastrec
= time_now
;
1918 // check sequence of this message
1920 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1921 // some to clear maybe?
1922 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1924 controlt
*c
= tunnel
[t
].controls
;
1925 tunnel
[t
].controls
= c
->next
;
1926 tunnel
[t
].controlc
--;
1927 c
->next
= controlfree
;
1930 tunnel
[t
].try = 0; // we have progress
1933 // receiver advance (do here so quoted correctly in any sends below)
1934 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1935 if (skip
< 0) skip
= 0;
1936 if (skip
< tunnel
[t
].controlc
)
1938 // some control packets can now be sent that were previous stuck out of window
1939 int tosend
= tunnel
[t
].window
- skip
;
1940 controlt
*c
= tunnel
[t
].controls
;
1948 tunnel
[t
].try = 0; // first send
1949 tunnelsend(c
->buf
, c
->length
, t
);
1954 if (!tunnel
[t
].controlc
)
1955 tunnel
[t
].retry
= 0; // caught up
1958 { // if not a null message
1964 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1966 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1972 LOG(1, s
, t
, "Invalid length in AVP\n");
1973 STAT(tunnel_rx_errors
);
1978 if (flags
& 0x3C) // reserved bits, should be clear
1980 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1982 result
= 2; // general error
1983 error
= 3; // reserved field non-zero
1988 if (*(uint16_t *) (b
))
1990 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1992 result
= 2; // general error
1993 error
= 6; // generic vendor-specific error
1994 msg
= "unsupported vendor-specific";
1998 mtype
= ntohs(*(uint16_t *) (b
));
2006 // handle hidden AVPs
2007 if (!*config
->l2tpsecret
)
2009 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2011 result
= 2; // general error
2012 error
= 6; // generic vendor-specific error
2013 msg
= "secret not specified";
2016 if (!session
[s
].random_vector_length
)
2018 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2020 result
= 2; // general error
2021 error
= 6; // generic
2022 msg
= "no random vector";
2027 LOG(2, s
, t
, "Short hidden AVP.\n");
2029 result
= 2; // general error
2030 error
= 2; // length is wrong
2036 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2038 orig_len
= ntohs(*(uint16_t *) b
);
2039 if (orig_len
> n
+ 2)
2041 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2045 result
= 2; // general error
2046 error
= 2; // length is wrong
2055 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2056 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2060 case 0: // message type
2061 message
= ntohs(*(uint16_t *) b
);
2062 mandatory
= flags
& 0x80;
2063 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_code(message
));
2065 case 1: // result code
2067 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2068 const char* resdesc
= "(unknown)";
2071 resdesc
= l2tp_stopccn_result_code(rescode
);
2073 else if (message
== 14)
2075 resdesc
= l2tp_cdn_result_code(rescode
);
2078 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2081 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2082 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, l2tp_error_code(errcode
));
2085 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2090 case 2: // protocol version
2092 version
= ntohs(*(uint16_t *) (b
));
2093 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2094 if (version
&& version
!= 0x0100)
2095 { // allow 0.0 and 1.0
2096 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2098 result
= 5; // unspported protocol version
2099 error
= 0x0100; // supported version
2105 case 3: // framing capabilities
2106 // LOG(4, s, t, "Framing capabilities\n");
2108 case 4: // bearer capabilities
2109 // LOG(4, s, t, "Bearer capabilities\n");
2111 case 5: // tie breaker
2112 // We never open tunnels, so we don't care about tie breakers
2113 // LOG(4, s, t, "Tie breaker\n");
2115 case 6: // firmware revision
2116 // LOG(4, s, t, "Firmware revision\n");
2118 case 7: // host name
2119 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2120 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2121 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2122 // TBA - to send to RADIUS
2124 case 8: // vendor name
2125 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2126 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2127 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2129 case 9: // assigned tunnel
2130 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2131 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2133 case 10: // rx window
2134 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2135 if (!tunnel
[t
].window
)
2136 tunnel
[t
].window
= 1; // window of 0 is silly
2137 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2139 case 11: // Challenge
2141 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2142 build_chap_response(b
, 2, n
, &chapresponse
);
2145 case 13: // Response
2146 // Why did they send a response? We never challenge.
2147 LOG(2, s
, t
, " received unexpected challenge response\n");
2150 case 14: // assigned session
2151 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2152 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2154 case 15: // call serial number
2155 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2157 case 18: // bearer type
2158 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2161 case 19: // framing type
2162 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2165 case 21: // called number
2166 memset(called
, 0, sizeof(called
));
2167 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2168 LOG(4, s
, t
, " Called <%s>\n", called
);
2170 case 22: // calling number
2171 memset(calling
, 0, sizeof(calling
));
2172 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2173 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2177 case 24: // tx connect speed
2180 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2184 // AS5300s send connect speed as a string
2186 memset(tmp
, 0, sizeof(tmp
));
2187 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2188 session
[s
].tx_connect_speed
= atol(tmp
);
2190 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2192 case 38: // rx connect speed
2195 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2199 // AS5300s send connect speed as a string
2201 memset(tmp
, 0, sizeof(tmp
));
2202 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2203 session
[s
].rx_connect_speed
= atol(tmp
);
2205 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2207 case 25: // Physical Channel ID
2209 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2210 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2213 case 29: // Proxy Authentication Type
2215 uint16_t atype
= ntohs(*(uint16_t *)b
);
2216 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, ppp_auth_type(atype
));
2218 authtype
= AUTHCHAP
;
2219 else if (atype
== 3)
2224 case 30: // Proxy Authentication Name
2227 memset(authname
, 0, sizeof(authname
));
2228 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2229 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2233 case 31: // Proxy Authentication Challenge
2235 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2236 if (sess_local
[s
].radius
)
2237 memcpy(radius
[sess_local
[s
].radius
].auth
, b
, 16);
2240 case 32: // Proxy Authentication ID
2242 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2243 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2244 if (sess_local
[s
].radius
)
2245 radius
[sess_local
[s
].radius
].id
= authid
;
2248 case 33: // Proxy Authentication Response
2249 LOG(4, s
, t
, " Proxy Auth Response\n");
2251 case 27: // last sent lcp
2252 { // find magic number
2253 uint8_t *p
= b
, *e
= p
+ n
;
2254 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2256 if (*p
== 5 && p
[1] == 6) // Magic-Number
2257 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2258 else if (*p
== 3 && p
[1] == 4 && *(uint16_t *) (p
+ 2) == htons(PPPPAP
)) // Authentication-Protocol (PAP)
2260 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol (CHAP)
2261 authtype
= AUTHCHAP
;
2262 else if (*p
== 7) // Protocol-Field-Compression
2263 aflags
|= SESSIONPFC
;
2264 else if (*p
== 8) // Address-and-Control-Field-Compression
2265 aflags
|= SESSIONACFC
;
2270 case 28: // last recv lcp confreq
2272 case 26: // Initial Received LCP CONFREQ
2274 case 39: // seq required - we control it as an LNS anyway...
2276 case 36: // Random Vector
2277 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2278 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2279 if (n
> sizeof(session
[s
].random_vector
))
2280 n
= sizeof(session
[s
].random_vector
);
2281 memcpy(session
[s
].random_vector
, b
, n
);
2282 session
[s
].random_vector_length
= n
;
2286 static char e
[] = "unknown AVP 0xXXXX";
2287 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2289 result
= 2; // general error
2290 error
= 8; // unknown mandatory AVP
2291 sprintf((msg
= e
) + 14, "%04x", mtype
);
2298 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2302 case 1: // SCCRQ - Start Control Connection Request
2303 tunnel
[t
].state
= TUNNELOPENING
;
2304 if (main_quit
!= QUIT_SHUTDOWN
)
2306 controlt
*c
= controlnew(2); // sending SCCRP
2307 control16(c
, 2, version
, 1); // protocol version
2308 control32(c
, 3, 3, 1); // framing
2309 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2310 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2311 control16(c
, 9, t
, 1); // assigned tunnel
2312 controladd(c
, t
, 0); // send the resply
2316 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2320 tunnel
[t
].state
= TUNNELOPEN
;
2323 tunnel
[t
].state
= TUNNELOPEN
;
2324 controlnull(t
); // ack
2327 controlnull(t
); // ack
2328 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2331 controlnull(t
); // simply ACK
2343 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2345 controlt
*c
= controlnew(11); // ICRP
2348 sessionfree
= session
[s
].next
;
2349 memset(&session
[s
], 0, sizeof(session
[s
]));
2351 if (s
> config
->cluster_highest_sessionid
)
2352 config
->cluster_highest_sessionid
= s
;
2354 session
[s
].opened
= time_now
;
2355 session
[s
].tunnel
= t
;
2356 session
[s
].far
= asession
;
2357 session
[s
].last_packet
= time_now
;
2358 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2359 control16(c
, 14, s
, 1); // assigned session
2360 controladd(c
, t
, asession
); // send the reply
2362 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2363 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2365 session
[s
].ppp
.phase
= Establish
;
2366 session
[s
].ppp
.lcp
= Starting
;
2368 STAT(session_created
);
2373 controlt
*c
= controlnew(14); // CDN
2376 STAT(session_overflow
);
2377 LOG(1, 0, t
, "No free sessions\n");
2378 control16(c
, 1, 4, 0); // temporary lack of resources
2381 control16(c
, 1, 2, 7); // shutting down, try another
2383 controladd(c
, t
, asession
); // send the message
2390 if (amagic
== 0) amagic
= time_now
;
2391 session
[s
].magic
= amagic
; // set magic number
2392 session
[s
].l2tp_flags
= aflags
; // set flags received
2393 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2394 controlnull(t
); // ack
2396 // proxy authentication type is not supported
2397 if (!(config
->radius_authtypes
& authtype
))
2398 authtype
= config
->radius_authprefer
;
2401 sendlcp(t
, s
, authtype
);
2402 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2403 sess_local
[s
].lcp
.conf_sent
= 1;
2404 sess_local
[s
].lcp
.nak_sent
= 0;
2405 sess_local
[s
].lcp_authtype
= authtype
;
2406 session
[s
].ppp
.lcp
= RequestSent
;
2410 controlnull(t
); // ack
2411 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2414 LOG(1, s
, t
, "Missing message type\n");
2417 STAT(tunnel_rx_errors
);
2419 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2421 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2424 if (chapresponse
) free(chapresponse
);
2425 cluster_send_tunnel(t
);
2429 LOG(4, s
, t
, " Got a ZLB ack\n");
2436 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2437 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2438 { // HDLC address header, discard
2444 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2445 STAT(tunnel_rx_errors
);
2455 prot
= ntohs(*(uint16_t *) p
);
2460 if (s
&& !session
[s
].opened
) // Is something wrong??
2462 if (!config
->cluster_iam_master
)
2464 // Pass it off to the master to deal with..
2465 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2470 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2471 STAT(tunnel_rx_errors
);
2477 session
[s
].last_packet
= time_now
;
2478 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2479 processpap(t
, s
, p
, l
);
2481 else if (prot
== PPPCHAP
)
2483 session
[s
].last_packet
= time_now
;
2484 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2485 processchap(t
, s
, p
, l
);
2487 else if (prot
== PPPLCP
)
2489 session
[s
].last_packet
= time_now
;
2490 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2491 processlcp(t
, s
, p
, l
);
2493 else if (prot
== PPPIPCP
)
2495 session
[s
].last_packet
= time_now
;
2496 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2497 processipcp(t
, s
, p
, l
);
2499 else if (prot
== PPPIPV6CP
)
2501 session
[s
].last_packet
= time_now
;
2502 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2503 processipv6cp(t
, s
, p
, l
);
2505 else if (prot
== PPPCCP
)
2507 session
[s
].last_packet
= time_now
;
2508 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2509 processccp(t
, s
, p
, l
);
2511 else if (prot
== PPPIP
)
2515 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2516 return; // closing session, PPP not processed
2519 session
[s
].last_packet
= time_now
;
2520 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2522 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2526 processipin(t
, s
, p
, l
);
2528 else if (prot
== PPPIPV6
)
2530 if (!config
->ipv6_prefix
.s6_addr
[0])
2532 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2537 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2538 return; // closing session, PPP not processed
2541 session
[s
].last_packet
= time_now
;
2542 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2544 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2548 processipv6in(t
, s
, p
, l
);
2552 STAT(tunnel_rx_errors
);
2553 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2558 // read and process packet on tun
2559 static void processtun(uint8_t * buf
, int len
)
2561 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2562 STAT(tun_rx_packets
);
2563 INC_STAT(tun_rx_bytes
, len
);
2571 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2572 STAT(tun_rx_errors
);
2576 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2577 processipout(buf
, len
);
2578 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2579 && config
->ipv6_prefix
.s6_addr
[0])
2580 processipv6out(buf
, len
);
2585 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2586 // that we look at the whole of the tunnel, radius and session tables
2588 static void regular_cleanups(double period
)
2590 // Next tunnel, radius and session to check for actions on.
2591 static tunnelidt t
= 0;
2593 static sessionidt s
= 0;
2606 // divide up tables into slices based on the last run
2607 t_slice
= config
->cluster_highest_tunnelid
* period
;
2608 r_slice
= (MAXRADIUS
- 1) * period
;
2609 s_slice
= config
->cluster_highest_sessionid
* period
;
2613 else if (t_slice
> config
->cluster_highest_tunnelid
)
2614 t_slice
= config
->cluster_highest_tunnelid
;
2618 else if (r_slice
> (MAXRADIUS
- 1))
2619 r_slice
= MAXRADIUS
- 1;
2623 else if (s_slice
> config
->cluster_highest_sessionid
)
2624 s_slice
= config
->cluster_highest_sessionid
;
2626 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2628 for (i
= 0; i
< t_slice
; i
++)
2631 if (t
> config
->cluster_highest_tunnelid
)
2634 // check for expired tunnels
2635 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2637 STAT(tunnel_timeout
);
2638 tunnelkill(t
, "Expired");
2642 // check for message resend
2643 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2645 // resend pending messages as timeout on reply
2646 if (tunnel
[t
].retry
<= TIME
)
2648 controlt
*c
= tunnel
[t
].controls
;
2649 uint8_t w
= tunnel
[t
].window
;
2650 tunnel
[t
].try++; // another try
2651 if (tunnel
[t
].try > 5)
2652 tunnelkill(t
, "Timeout on control message"); // game over
2656 tunnelsend(c
->buf
, c
->length
, t
);
2664 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2666 controlt
*c
= controlnew(6); // sending HELLO
2667 controladd(c
, t
, 0); // send the message
2668 LOG(3, 0, t
, "Sending HELLO message\n");
2672 // Check for tunnel changes requested from the CLI
2673 if ((a
= cli_tunnel_actions
[t
].action
))
2675 cli_tunnel_actions
[t
].action
= 0;
2676 if (a
& CLI_TUN_KILL
)
2678 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2679 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2685 for (i
= 0; i
< r_slice
; i
++)
2691 if (!radius
[r
].state
)
2694 if (radius
[r
].retry
<= TIME
)
2701 for (i
= 0; i
< s_slice
; i
++)
2704 if (s
> config
->cluster_highest_sessionid
)
2707 if (!session
[s
].opened
) // Session isn't in use
2710 // check for expired sessions
2713 if (session
[s
].die
<= TIME
)
2715 sessionkill(s
, "Expired");
2722 if (sess_local
[s
].lcp
.restart
>= time_now
)
2724 int next_state
= session
[s
].ppp
.lcp
;
2725 switch (session
[s
].ppp
.lcp
)
2729 next_state
= RequestSent
;
2732 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
2734 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
2735 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2736 sess_local
[s
].lcp
.conf_sent
++;
2737 sendlcp(t
, s
, sess_local
[s
].lcp_authtype
);
2738 change_state(s
, lcp
, next_state
);
2742 sessionshutdown(s
, "No response to LCP ConfigReq.", 3, 0);
2743 STAT(session_timeout
);
2753 if (sess_local
[s
].ipcp
.restart
>= time_now
)
2755 int next_state
= session
[s
].ppp
.ipcp
;
2756 switch (session
[s
].ppp
.ipcp
)
2760 next_state
= RequestSent
;
2763 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
2765 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
2766 sess_local
[s
].ipcp
.restart
= time_now
+ config
->ppp_restart_time
;
2767 sess_local
[s
].ipcp
.conf_sent
++;
2769 change_state(s
, ipcp
, next_state
);
2773 sessionshutdown(s
, "No response to IPCP ConfigReq.", 3, 0);
2774 STAT(session_timeout
);
2784 if (sess_local
[s
].ipv6cp
.restart
>= time_now
)
2786 int next_state
= session
[s
].ppp
.ipv6cp
;
2787 switch (session
[s
].ppp
.ipv6cp
)
2791 next_state
= RequestSent
;
2794 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
2796 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
2797 sess_local
[s
].ipv6cp
.restart
= time_now
+ config
->ppp_restart_time
;
2798 sess_local
[s
].ipv6cp
.conf_sent
++;
2800 change_state(s
, ipv6cp
, next_state
);
2804 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
2805 change_state(s
, ipv6cp
, Stopped
);
2812 if (sess_local
[s
].ccp
.restart
>= time_now
)
2814 int next_state
= session
[s
].ppp
.ccp
;
2815 switch (session
[s
].ppp
.ccp
)
2819 next_state
= RequestSent
;
2822 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
2824 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
2825 sess_local
[s
].ccp
.restart
= time_now
+ config
->ppp_restart_time
;
2826 sess_local
[s
].ccp
.conf_sent
++;
2828 change_state(s
, ccp
, next_state
);
2832 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
2833 change_state(s
, ccp
, Stopped
);
2840 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2841 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2843 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2844 STAT(session_timeout
);
2849 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2850 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2852 uint8_t b
[MAXCONTROL
] = {0};
2854 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2858 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2859 *(uint16_t *)(q
+ 2) = htons(8); // Length
2860 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2862 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2863 (int)(time_now
- session
[s
].last_packet
));
2864 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2868 // Check for actions requested from the CLI
2869 if ((a
= cli_session_actions
[s
].action
))
2873 cli_session_actions
[s
].action
= 0;
2874 if (a
& CLI_SESS_KILL
)
2876 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2877 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2878 a
= 0; // dead, no need to check for other actions
2882 if (a
& CLI_SESS_NOSNOOP
)
2884 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2885 session
[s
].snoop_ip
= 0;
2886 session
[s
].snoop_port
= 0;
2890 else if (a
& CLI_SESS_SNOOP
)
2892 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2893 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2894 cli_session_actions
[s
].snoop_port
);
2896 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2897 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2902 if (a
& CLI_SESS_NOTHROTTLE
)
2904 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2905 throttle_session(s
, 0, 0);
2909 else if (a
& CLI_SESS_THROTTLE
)
2911 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2912 cli_session_actions
[s
].throttle_in
,
2913 cli_session_actions
[s
].throttle_out
);
2915 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2920 if (a
& CLI_SESS_NOFILTER
)
2922 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2923 filter_session(s
, 0, 0);
2927 else if (a
& CLI_SESS_FILTER
)
2929 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2930 cli_session_actions
[s
].filter_in
,
2931 cli_session_actions
[s
].filter_out
);
2933 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2939 cluster_send_session(s
);
2942 // RADIUS interim accounting
2943 if (config
->radius_accounting
&& config
->radius_interim
> 0
2944 && session
[s
].ip
&& !session
[s
].walled_garden
2945 && !sess_local
[s
].radius
// RADIUS already in progress
2946 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2948 int rad
= radiusnew(s
);
2951 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2952 STAT(radius_overflow
);
2956 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2957 session
[s
].user
, session
[s
].unique_id
);
2959 radiussend(rad
, RADIUSINTERIM
);
2960 sess_local
[s
].last_interim
= time_now
;
2965 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
2966 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
2970 // Are we in the middle of a tunnel update, or radius
2973 static int still_busy(void)
2976 static clockt last_talked
= 0;
2977 static clockt start_busy_wait
= 0;
2979 if (!config
->cluster_iam_master
)
2982 static time_t stopped_bgp
= 0;
2987 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
2989 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2990 if (bgp_peers
[i
].state
== Established
)
2991 bgp_stop(&bgp_peers
[i
]);
2993 stopped_bgp
= time_now
;
2995 // we don't want to become master
2996 cluster_send_ping(0);
3001 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
3009 if (main_quit
== QUIT_SHUTDOWN
)
3011 static int dropped
= 0;
3016 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3017 for (i
= 1; i
< MAXTUNNEL
; i
++)
3018 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3019 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3025 if (start_busy_wait
== 0)
3026 start_busy_wait
= TIME
;
3028 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3030 if (!tunnel
[i
].controlc
)
3033 if (last_talked
!= TIME
)
3035 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
3041 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3042 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3044 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3048 for (i
= 1; i
< MAXRADIUS
; i
++)
3050 if (radius
[i
].state
== RADIUSNULL
)
3052 if (radius
[i
].state
== RADIUSWAIT
)
3055 if (last_talked
!= TIME
)
3057 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
3067 # include <sys/epoll.h>
3069 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3070 # include "fake_epoll.h"
3073 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3076 // additional polled fds
3078 # define EXTRA_FDS BGP_NUM_PEERS
3080 # define EXTRA_FDS 0
3083 // main loop - gets packets on tun or udp and processes them
3084 static void mainloop(void)
3088 clockt next_cluster_ping
= 0; // send initial ping immediately
3089 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3090 int maxevent
= sizeof(events
)/sizeof(*events
);
3092 if ((epollfd
= epoll_create(maxevent
)) < 0)
3094 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3098 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3099 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3101 /* setup our fds to poll for input */
3103 static struct event_data d
[BASE_FDS
];
3104 struct epoll_event e
;
3109 d
[i
].type
= FD_TYPE_CLI
;
3110 e
.data
.ptr
= &d
[i
++];
3111 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3113 d
[i
].type
= FD_TYPE_CLUSTER
;
3114 e
.data
.ptr
= &d
[i
++];
3115 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3117 d
[i
].type
= FD_TYPE_TUN
;
3118 e
.data
.ptr
= &d
[i
++];
3119 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3121 d
[i
].type
= FD_TYPE_UDP
;
3122 e
.data
.ptr
= &d
[i
++];
3123 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3125 d
[i
].type
= FD_TYPE_CONTROL
;
3126 e
.data
.ptr
= &d
[i
++];
3127 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3129 d
[i
].type
= FD_TYPE_DAE
;
3130 e
.data
.ptr
= &d
[i
++];
3131 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3135 signal(SIGPIPE
, SIG_IGN
);
3136 bgp_setup(config
->as_number
);
3137 if (config
->bind_address
)
3138 bgp_add_route(config
->bind_address
, 0xffffffff);
3140 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3142 if (config
->neighbour
[i
].name
[0])
3143 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3144 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3145 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3149 while (!main_quit
|| still_busy())
3154 if (config
->reload_config
)
3156 // Update the config state based on config settings
3164 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3165 STAT(select_called
);
3170 if (errno
== EINTR
||
3171 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3174 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3180 struct sockaddr_in addr
;
3185 int cluster_ready
= 0;
3188 int cluster_pkts
= 0;
3190 uint32_t bgp_events
[BGP_NUM_PEERS
];
3191 memset(bgp_events
, 0, sizeof(bgp_events
));
3194 for (c
= n
, i
= 0; i
< c
; i
++)
3196 struct event_data
*d
= events
[i
].data
.ptr
;
3199 case FD_TYPE_CLI
: // CLI connections
3203 alen
= sizeof(addr
);
3204 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3210 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3216 // these are handled below, with multiple interleaved reads
3217 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3218 case FD_TYPE_TUN
: tun_ready
++; break;
3219 case FD_TYPE_UDP
: udp_ready
++; break;
3221 case FD_TYPE_CONTROL
: // nsctl commands
3222 alen
= sizeof(addr
);
3223 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3227 case FD_TYPE_DAE
: // DAE requests
3228 alen
= sizeof(addr
);
3229 processdae(buf
, recvfrom(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3233 case FD_TYPE_RADIUS
: // RADIUS response
3234 s
= recv(radfds
[d
->index
], buf
, sizeof(buf
), 0);
3235 if (s
>= 0 && config
->cluster_iam_master
)
3236 processrad(buf
, s
, d
->index
);
3243 bgp_events
[d
->index
] = events
[i
].events
;
3249 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3254 bgp_process(bgp_events
);
3257 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3262 alen
= sizeof(addr
);
3263 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3265 processudp(buf
, s
, &addr
);
3278 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3293 alen
= sizeof(addr
);
3294 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3296 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3307 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3308 STAT(multi_read_used
);
3310 if (c
>= config
->multi_read_count
)
3312 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3313 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3315 STAT(multi_read_exceeded
);
3320 // Runs on every machine (master and slaves).
3321 if (next_cluster_ping
<= TIME
)
3323 // Check to see which of the cluster is still alive..
3325 cluster_send_ping(basetime
); // Only does anything if we're a slave
3326 cluster_check_master(); // ditto.
3328 cluster_heartbeat(); // Only does anything if we're a master.
3329 cluster_check_slaves(); // ditto.
3331 master_update_counts(); // If we're a slave, send our byte counters to our master.
3333 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3334 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3336 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3339 if (!config
->cluster_iam_master
)
3342 // Run token bucket filtering queue..
3343 // Only run it every 1/10th of a second.
3345 static clockt last_run
= 0;
3346 if (last_run
!= TIME
)
3353 // Handle timeouts, retries etc.
3355 static double last_clean
= 0;
3359 TIME
= now(&this_clean
);
3360 diff
= this_clean
- last_clean
;
3362 // Run during idle time (after we've handled
3363 // all incoming packets) or every 1/10th sec
3364 if (!more
|| diff
> 0.1)
3366 regular_cleanups(diff
);
3367 last_clean
= this_clean
;
3371 if (*config
->accounting_dir
)
3373 static clockt next_acct
= 0;
3374 static clockt next_shut_acct
= 0;
3376 if (next_acct
<= TIME
)
3378 // Dump accounting data
3379 next_acct
= TIME
+ ACCT_TIME
;
3380 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3383 else if (next_shut_acct
<= TIME
)
3385 // Dump accounting data for shutdown sessions
3386 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3393 // Are we the master and shutting down??
3394 if (config
->cluster_iam_master
)
3395 cluster_heartbeat(); // Flush any queued changes..
3397 // Ok. Notify everyone we're shutting down. If we're
3398 // the master, this will force an election.
3399 cluster_send_ping(0);
3402 // Important!!! We MUST not process any packets past this point!
3403 LOG(1, 0, 0, "Shutdown complete\n");
3406 static void stripdomain(char *host
)
3410 if ((p
= strchr(host
, '.')))
3416 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3422 while (fgets(buf
, sizeof(buf
), resolv
))
3424 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3427 if (!isspace(buf
[6]))
3431 while (isspace(*b
)) b
++;
3436 while (*b
&& !isspace(*b
)) b
++;
3438 if (buf
[0] == 'd') // domain is canonical
3444 // first search line
3447 // hold, may be subsequent domain line
3448 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3459 int hl
= strlen(host
);
3460 int dl
= strlen(domain
);
3461 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3462 host
[hl
-dl
- 1] = 0;
3466 *p
= 0; // everything after first dot
3471 // Init data structures
3472 static void initdata(int optdebug
, char *optconfig
)
3476 if (!(config
= shared_malloc(sizeof(configt
))))
3478 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3482 memset(config
, 0, sizeof(configt
));
3483 time(&config
->start_time
);
3484 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3485 config
->debug
= optdebug
;
3486 config
->num_tbfs
= MAXTBFS
;
3487 config
->rl_rate
= 28; // 28kbps
3488 config
->cluster_master_min_adv
= 1;
3489 config
->ppp_restart_time
= 3;
3490 config
->ppp_max_configure
= 10;
3491 config
->ppp_max_failure
= 5;
3492 strcpy(config
->random_device
, RANDOMDEVICE
);
3494 log_stream
= stderr
;
3497 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3499 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3502 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3505 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3507 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3510 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3512 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3515 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3517 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3521 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3523 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3527 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3529 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3533 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3535 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3539 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3541 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3544 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3546 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3548 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3551 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3553 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3555 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3558 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3560 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3561 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3562 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3563 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3565 // Put all the sessions on the free list marked as undefined.
3566 for (i
= 1; i
< MAXSESSION
; i
++)
3568 session
[i
].next
= i
+ 1;
3569 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3571 session
[MAXSESSION
- 1].next
= 0;
3574 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3575 for (i
= 1; i
< MAXTUNNEL
; i
++)
3576 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3580 // Grab my hostname unless it's been specified
3581 gethostname(hostname
, sizeof(hostname
));
3582 stripdomain(hostname
);
3585 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3588 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3590 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3596 static int assign_ip_address(sessionidt s
)
3600 time_t best_time
= time_now
;
3601 char *u
= session
[s
].user
;
3605 CSTAT(assign_ip_address
);
3607 for (i
= 1; i
< ip_pool_size
; i
++)
3609 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3612 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3619 if (ip_address_pool
[i
].last
< best_time
)
3622 if (!(best_time
= ip_address_pool
[i
].last
))
3623 break; // never used, grab this one
3629 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3633 session
[s
].ip
= ip_address_pool
[best
].address
;
3634 session
[s
].ip_pool_index
= best
;
3635 ip_address_pool
[best
].assigned
= 1;
3636 ip_address_pool
[best
].last
= time_now
;
3637 ip_address_pool
[best
].session
= s
;
3638 if (session
[s
].walled_garden
)
3639 /* Don't track addresses of users in walled garden (note: this
3640 means that their address isn't "sticky" even if they get
3642 ip_address_pool
[best
].user
[0] = 0;
3644 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3647 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3648 reuse
? "Reusing" : "Allocating", best
);
3653 static void free_ip_address(sessionidt s
)
3655 int i
= session
[s
].ip_pool_index
;
3658 CSTAT(free_ip_address
);
3661 return; // what the?
3663 if (i
< 0) // Is this actually part of the ip pool?
3667 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3669 ip_address_pool
[i
].assigned
= 0;
3670 ip_address_pool
[i
].session
= 0;
3671 ip_address_pool
[i
].last
= time_now
;
3675 // Fsck the address pool against the session table.
3676 // Normally only called when we become a master.
3678 // This isn't perfect: We aren't keep tracking of which
3679 // users used to have an IP address.
3681 void rebuild_address_pool(void)
3686 // Zero the IP pool allocation, and build
3687 // a map from IP address to pool index.
3688 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3690 ip_address_pool
[i
].assigned
= 0;
3691 ip_address_pool
[i
].session
= 0;
3692 if (!ip_address_pool
[i
].address
)
3695 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3698 for (i
= 0; i
< MAXSESSION
; ++i
)
3701 if (!(session
[i
].opened
&& session
[i
].ip
))
3704 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3706 if (session
[i
].ip_pool_index
< 0)
3708 // Not allocated out of the pool.
3709 if (ipid
< 1) // Not found in the pool either? good.
3712 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3713 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3715 // Fall through and process it as part of the pool.
3719 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3721 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3723 session
[i
].ip_pool_index
= ipid
;
3727 ip_address_pool
[ipid
].assigned
= 1;
3728 ip_address_pool
[ipid
].session
= i
;
3729 ip_address_pool
[ipid
].last
= time_now
;
3730 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3731 session
[i
].ip_pool_index
= ipid
;
3732 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3737 // Fix the address pool to match a changed session.
3738 // (usually when the master sends us an update).
3739 static void fix_address_pool(int sid
)
3743 ipid
= session
[sid
].ip_pool_index
;
3745 if (ipid
> ip_pool_size
)
3746 return; // Ignore it. rebuild_address_pool will fix it up.
3748 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3749 return; // Just ignore it. rebuild_address_pool will take care of it.
3751 ip_address_pool
[ipid
].assigned
= 1;
3752 ip_address_pool
[ipid
].session
= sid
;
3753 ip_address_pool
[ipid
].last
= time_now
;
3754 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3758 // Add a block of addresses to the IP pool to hand out.
3760 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3764 mask
= 0xffffffff; // Host route only.
3768 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3771 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3773 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3774 continue; // Skip 0 and broadcast addresses.
3776 ip_address_pool
[ip_pool_size
].address
= i
;
3777 ip_address_pool
[ip_pool_size
].assigned
= 0;
3779 if (ip_pool_size
>= MAXIPPOOL
)
3781 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3787 // Initialize the IP address pool
3788 static void initippool()
3793 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3795 if (!(f
= fopen(IPPOOLFILE
, "r")))
3797 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3801 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3804 buf
[4095] = 0; // Force it to be zero terminated/
3806 if (*buf
== '#' || *buf
== '\n')
3807 continue; // Skip comments / blank lines
3808 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3809 if ((p
= (char *)strchr(buf
, ':')))
3813 src
= inet_addr(buf
);
3814 if (src
== INADDR_NONE
)
3816 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3819 // This entry is for a specific IP only
3820 if (src
!= config
->bind_address
)
3825 if ((p
= (char *)strchr(pool
, '/')))
3829 in_addr_t start
= 0, mask
= 0;
3831 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3833 if (!*p
|| !(numbits
= atoi(p
)))
3835 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3838 start
= ntohl(inet_addr(pool
));
3839 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3841 // Add a static route for this pool
3842 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3843 fmtaddr(htonl(start
), 0), 32 + mask
);
3845 routeset(0, start
, mask
, 0, 1);
3847 add_to_ip_pool(start
, mask
);
3851 // It's a single ip address
3852 add_to_ip_pool(inet_addr(pool
), 0);
3856 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3859 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3861 struct sockaddr_in snoop_addr
= {0};
3862 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3865 snoop_addr
.sin_family
= AF_INET
;
3866 snoop_addr
.sin_addr
.s_addr
= destination
;
3867 snoop_addr
.sin_port
= ntohs(port
);
3869 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3870 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3871 htons(snoop_addr
.sin_port
));
3873 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3874 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3876 STAT(packets_snooped
);
3879 static int dump_session(FILE **f
, sessiont
*s
)
3881 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
3886 char filename
[1024];
3888 time_t now
= time(NULL
);
3890 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3891 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3893 if (!(*f
= fopen(filename
, "w")))
3895 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3899 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3900 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3905 "# format: username ip qos uptxoctets downrxoctets\n",
3907 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
3912 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3913 fprintf(*f
, "%s %s %d %u %u\n",
3914 s
->user
, // username
3915 fmtaddr(htonl(s
->ip
), 0), // ip
3916 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3917 (uint32_t) s
->cin_delta
, // uptxoctets
3918 (uint32_t) s
->cout_delta
); // downrxoctets
3920 s
->cin_delta
= s
->cout_delta
= 0;
3925 static void dump_acct_info(int all
)
3931 CSTAT(dump_acct_info
);
3935 for (i
= 0; i
< shut_acct_n
; i
++)
3936 dump_session(&f
, &shut_acct
[i
]);
3942 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3943 dump_session(&f
, &session
[i
]);
3950 int main(int argc
, char *argv
[])
3954 char *optconfig
= CONFIGFILE
;
3956 time(&basetime
); // start clock
3959 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3964 if (fork()) exit(0);
3966 freopen("/dev/null", "r", stdin
);
3967 freopen("/dev/null", "w", stdout
);
3968 freopen("/dev/null", "w", stderr
);
3977 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3980 printf("Args are:\n"
3981 "\t-d\t\tDetach from terminal\n"
3982 "\t-c <file>\tConfig file\n"
3983 "\t-h <hostname>\tForce hostname\n"
3991 // Start the timer routine off
3993 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3994 signal(SIGALRM
, sigalrm_handler
);
3995 siginterrupt(SIGALRM
, 0);
3998 initdata(optdebug
, optconfig
);
4002 init_tbf(config
->num_tbfs
);
4004 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
4005 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
4006 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4009 rlim
.rlim_cur
= RLIM_INFINITY
;
4010 rlim
.rlim_max
= RLIM_INFINITY
;
4011 // Remove the maximum core size
4012 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
4013 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
4015 // Make core dumps go to /tmp
4019 if (config
->scheduler_fifo
)
4022 struct sched_param params
= {0};
4023 params
.sched_priority
= 1;
4025 if (get_nprocs() < 2)
4027 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4028 config
->scheduler_fifo
= 0;
4032 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4034 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4038 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4039 config
->scheduler_fifo
= 0;
4044 /* Set up the cluster communications port. */
4045 if (cluster_init() < 0)
4049 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4057 unsigned seed
= time_now
^ getpid();
4058 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4062 signal(SIGHUP
, sighup_handler
);
4063 signal(SIGCHLD
, sigchild_handler
);
4064 signal(SIGTERM
, shutdown_handler
);
4065 signal(SIGINT
, shutdown_handler
);
4066 signal(SIGQUIT
, shutdown_handler
);
4068 // Prevent us from getting paged out
4069 if (config
->lock_pages
)
4071 if (!mlockall(MCL_CURRENT
))
4072 LOG(1, 0, 0, "Locking pages into memory\n");
4074 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4079 // Drop privileges here
4080 if (config
->target_uid
> 0 && geteuid() == 0)
4081 setuid(config
->target_uid
);
4085 /* remove plugins (so cleanup code gets run) */
4088 // Remove the PID file if we wrote it
4089 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4090 unlink(config
->pid_file
);
4092 /* kill CLI children */
4093 signal(SIGTERM
, SIG_IGN
);
4098 static void sighup_handler(int sig
)
4102 if (log_stream
!= stderr
)
4111 static void sigalrm_handler(int sig
)
4113 // Log current traffic stats
4115 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4116 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4117 (udp_rx
/ 1024.0 / 1024.0 * 8),
4118 (eth_tx
/ 1024.0 / 1024.0 * 8),
4119 (eth_rx
/ 1024.0 / 1024.0 * 8),
4120 (udp_tx
/ 1024.0 / 1024.0 * 8),
4121 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
4122 udp_rx_pkt
, eth_rx_pkt
);
4124 udp_tx
= udp_rx
= 0;
4125 udp_rx_pkt
= eth_rx_pkt
= 0;
4126 eth_tx
= eth_rx
= 0;
4128 if (config
->dump_speed
)
4129 printf("%s\n", config
->bandwidth
);
4131 // Update the internal time counter
4133 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4138 struct param_timer p
= { time_now
};
4139 run_plugins(PLUGIN_TIMER
, &p
);
4144 static void shutdown_handler(int sig
)
4146 LOG(1, 0, 0, "Shutting down\n");
4147 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4150 static void sigchild_handler(int sig
)
4152 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4156 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4159 *challenge_response
= NULL
;
4161 if (!*config
->l2tpsecret
)
4163 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4167 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4169 *challenge_response
= calloc(17, 1);
4172 MD5_Update(&ctx
, &id
, 1);
4173 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4174 MD5_Update(&ctx
, challenge
, challenge_length
);
4175 MD5_Final(*challenge_response
, &ctx
);
4180 static int facility_value(char *name
)
4183 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4185 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4186 return facilitynames
[i
].c_val
;
4191 static void update_config()
4195 static int timeout
= 0;
4196 static int interval
= 0;
4203 if (log_stream
!= stderr
)
4209 if (*config
->log_filename
)
4211 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4213 char *p
= config
->log_filename
+ 7;
4216 openlog("l2tpns", LOG_PID
, facility_value(p
));
4220 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4222 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4224 fseek(log_stream
, 0, SEEK_END
);
4225 setbuf(log_stream
, NULL
);
4229 log_stream
= stderr
;
4230 setbuf(log_stream
, NULL
);
4236 log_stream
= stderr
;
4237 setbuf(log_stream
, NULL
);
4241 config
->numradiusservers
= 0;
4242 for (i
= 0; i
< MAXRADSERVER
; i
++)
4243 if (config
->radiusserver
[i
])
4245 config
->numradiusservers
++;
4246 // Set radius port: if not set, take the port from the
4247 // first radius server. For the first radius server,
4248 // take the #defined default value from l2tpns.h
4250 // test twice, In case someone works with
4251 // a secondary radius server without defining
4252 // a primary one, this will work even then.
4253 if (i
> 0 && !config
->radiusport
[i
])
4254 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4255 if (!config
->radiusport
[i
])
4256 config
->radiusport
[i
] = RADPORT
;
4259 if (!config
->numradiusservers
)
4260 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4262 // parse radius_authtypes_s
4263 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4264 p
= config
->radius_authtypes_s
;
4267 char *s
= strpbrk(p
, " \t,");
4273 while (*s
== ' ' || *s
== '\t')
4280 if (!strncasecmp("chap", p
, strlen(p
)))
4282 else if (!strncasecmp("pap", p
, strlen(p
)))
4285 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4287 config
->radius_authtypes
|= type
;
4288 if (!config
->radius_authprefer
)
4289 config
->radius_authprefer
= type
;
4294 if (!config
->radius_authtypes
)
4296 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4297 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4300 // normalise radius_authtypes_s
4301 if (config
->radius_authprefer
== AUTHPAP
)
4303 strcpy(config
->radius_authtypes_s
, "pap");
4304 if (config
->radius_authtypes
& AUTHCHAP
)
4305 strcat(config
->radius_authtypes_s
, ", chap");
4309 strcpy(config
->radius_authtypes_s
, "chap");
4310 if (config
->radius_authtypes
& AUTHPAP
)
4311 strcat(config
->radius_authtypes_s
, ", pap");
4314 if (!config
->radius_dae_port
)
4315 config
->radius_dae_port
= DAEPORT
;
4317 // re-initialise the random number source
4318 initrandom(config
->random_device
);
4321 for (i
= 0; i
< MAXPLUGINS
; i
++)
4323 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4326 if (*config
->plugins
[i
])
4329 add_plugin(config
->plugins
[i
]);
4331 else if (*config
->old_plugins
[i
])
4334 remove_plugin(config
->old_plugins
[i
]);
4338 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4339 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4340 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4341 if (!*config
->cluster_interface
)
4342 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4344 if (!config
->cluster_hb_interval
)
4345 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4347 if (!config
->cluster_hb_timeout
)
4348 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4350 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4352 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4353 // late, ensure we're sufficiently larger than that
4354 int t
= 4 * config
->cluster_hb_interval
+ 11;
4356 if (config
->cluster_hb_timeout
< t
)
4358 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4359 config
->cluster_hb_timeout
= t
;
4362 // Push timing changes to the slaves immediately if we're the master
4363 if (config
->cluster_iam_master
)
4364 cluster_heartbeat();
4366 interval
= config
->cluster_hb_interval
;
4367 timeout
= config
->cluster_hb_timeout
;
4371 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4374 if ((f
= fopen(config
->pid_file
, "w")))
4376 fprintf(f
, "%d\n", getpid());
4378 config
->wrote_pid
= 1;
4382 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4386 config
->reload_config
= 0;
4389 static void read_config_file()
4393 if (!config
->config_file
) return;
4394 if (!(f
= fopen(config
->config_file
, "r")))
4396 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4400 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4402 LOG(3, 0, 0, "Done reading config file\n");
4407 int sessionsetup(tunnelidt t
, sessionidt s
)
4409 // A session now exists, set it up
4415 CSTAT(sessionsetup
);
4417 LOG(3, s
, t
, "Doing session setup for session\n");
4421 assign_ip_address(s
);
4424 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4425 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4428 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4429 fmtaddr(htonl(session
[s
].ip
), 0));
4433 // Make sure this is right
4434 session
[s
].tunnel
= t
;
4436 // zap old sessions with same IP and/or username
4437 // Don't kill gardened sessions - doing so leads to a DoS
4438 // from someone who doesn't need to know the password
4441 user
= session
[s
].user
;
4442 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4444 if (i
== s
) continue;
4445 if (!session
[s
].opened
) continue;
4446 if (ip
== session
[i
].ip
)
4448 sessionkill(i
, "Duplicate IP address");
4452 if (config
->allow_duplicate_users
) continue;
4453 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4454 if (!strcasecmp(user
, session
[i
].user
))
4455 sessionkill(i
, "Duplicate session for users");
4462 // Add the route for this session.
4463 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4465 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4466 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4469 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4472 // Static IPs need to be routed if not already
4473 // convered by a Framed-Route. Anything else is part
4474 // of the IP address pool and is already routed, it
4475 // just needs to be added to the IP cache.
4476 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4477 if (session
[s
].ip_pool_index
== -1) // static ip
4479 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4482 cache_ipmap(session
[s
].ip
, s
);
4485 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
4486 lcp_open(t
, s
); // transition to Network phase and send initial IPCP
4488 // Run the plugin's against this new session.
4490 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4491 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4494 // Allocate TBFs if throttled
4495 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4496 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4498 session
[s
].last_packet
= time_now
;
4500 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4501 fmtaddr(htonl(session
[s
].ip
), 0),
4502 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4504 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4506 return 1; // RADIUS OK and IP allocated, done...
4510 // This session just got dropped on us by the master or something.
4511 // Make sure our tables up up to date...
4513 int load_session(sessionidt s
, sessiont
*new)
4519 if (new->ip_pool_index
>= MAXIPPOOL
||
4520 new->tunnel
>= MAXTUNNEL
)
4522 LOG(0, s
, 0, "Strange session update received!\n");
4523 // FIXME! What to do here?
4528 // Ok. All sanity checks passed. Now we're committed to
4529 // loading the new session.
4532 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4534 // See if routes/ip cache need updating
4535 if (new->ip
!= session
[s
].ip
)
4538 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4539 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4540 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4548 // remove old routes...
4549 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4551 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4552 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4555 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4561 if (session
[s
].ip_pool_index
== -1) // static IP
4563 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4565 else // It's part of the IP pool, remove it manually.
4566 uncache_ipmap(session
[s
].ip
);
4571 // add new routes...
4572 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4574 if ((new->ip
& new->route
[i
].mask
) ==
4575 (new->route
[i
].ip
& new->route
[i
].mask
))
4578 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4584 // If there's a new one, add it.
4585 if (new->ip_pool_index
== -1)
4587 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4590 cache_ipmap(new->ip
, s
);
4595 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
4596 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4599 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4601 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4605 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4607 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4608 new->filter_out
= 0;
4611 if (new->filter_in
!= session
[s
].filter_in
)
4613 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4614 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4617 if (new->filter_out
!= session
[s
].filter_out
)
4619 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4620 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4623 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4624 // for walking the sessions to forward byte counts to the master.
4625 config
->cluster_highest_sessionid
= s
;
4627 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4629 // Do fixups into address pool.
4630 if (new->ip_pool_index
!= -1)
4631 fix_address_pool(s
);
4636 static void initplugins()
4640 loaded_plugins
= ll_init();
4641 // Initialize the plugins to nothing
4642 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4643 plugins
[i
] = ll_init();
4646 static void *open_plugin(char *plugin_name
, int load
)
4648 char path
[256] = "";
4650 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4651 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4652 return dlopen(path
, RTLD_NOW
);
4655 // plugin callback to get a config value
4656 static void *getconfig(char *key
, enum config_typet type
)
4660 for (i
= 0; config_values
[i
].key
; i
++)
4662 if (!strcmp(config_values
[i
].key
, key
))
4664 if (config_values
[i
].type
== type
)
4665 return ((void *) config
) + config_values
[i
].offset
;
4667 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4668 key
, type
, config_values
[i
].type
);
4674 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4678 static int add_plugin(char *plugin_name
)
4680 static struct pluginfuncs funcs
= {
4685 sessiontbysessionidt
,
4686 sessionidtbysessiont
,
4693 cluster_send_session
,
4696 void *p
= open_plugin(plugin_name
, 1);
4697 int (*initfunc
)(struct pluginfuncs
*);
4702 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4706 if (ll_contains(loaded_plugins
, p
))
4709 return 0; // already loaded
4713 int *v
= dlsym(p
, "plugin_api_version");
4714 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4716 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4722 if ((initfunc
= dlsym(p
, "plugin_init")))
4724 if (!initfunc(&funcs
))
4726 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4732 ll_push(loaded_plugins
, p
);
4734 for (i
= 0; i
< max_plugin_functions
; i
++)
4737 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4739 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4740 ll_push(plugins
[i
], x
);
4744 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4748 static void run_plugin_done(void *plugin
)
4750 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4756 static int remove_plugin(char *plugin_name
)
4758 void *p
= open_plugin(plugin_name
, 0);
4764 if (ll_contains(loaded_plugins
, p
))
4767 for (i
= 0; i
< max_plugin_functions
; i
++)
4770 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4771 ll_delete(plugins
[i
], x
);
4774 ll_delete(loaded_plugins
, p
);
4780 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4784 int run_plugins(int plugin_type
, void *data
)
4786 int (*func
)(void *data
);
4788 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4789 return PLUGIN_RET_ERROR
;
4791 ll_reset(plugins
[plugin_type
]);
4792 while ((func
= ll_next(plugins
[plugin_type
])))
4796 if (r
!= PLUGIN_RET_OK
)
4797 return r
; // stop here
4800 return PLUGIN_RET_OK
;
4803 static void plugins_done()
4807 ll_reset(loaded_plugins
);
4808 while ((p
= ll_next(loaded_plugins
)))
4812 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4814 struct nsctl request
;
4815 struct nsctl response
;
4816 int type
= unpack_control(&request
, buf
, len
);
4820 if (log_stream
&& config
->debug
>= 4)
4824 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4825 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4829 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4830 dump_control(&request
, log_stream
);
4836 case NSCTL_REQ_LOAD
:
4837 if (request
.argc
!= 1)
4839 response
.type
= NSCTL_RES_ERR
;
4841 response
.argv
[0] = "name of plugin required";
4843 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4845 response
.type
= NSCTL_RES_ERR
;
4847 response
.argv
[0] = !r
4848 ? "plugin already loaded"
4849 : "error loading plugin";
4853 response
.type
= NSCTL_RES_OK
;
4859 case NSCTL_REQ_UNLOAD
:
4860 if (request
.argc
!= 1)
4862 response
.type
= NSCTL_RES_ERR
;
4864 response
.argv
[0] = "name of plugin required";
4866 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4868 response
.type
= NSCTL_RES_ERR
;
4870 response
.argv
[0] = !r
4871 ? "plugin not loaded"
4872 : "plugin not found";
4876 response
.type
= NSCTL_RES_OK
;
4882 case NSCTL_REQ_HELP
:
4883 response
.type
= NSCTL_RES_OK
;
4886 ll_reset(loaded_plugins
);
4887 while ((p
= ll_next(loaded_plugins
)))
4889 char **help
= dlsym(p
, "plugin_control_help");
4890 while (response
.argc
< 0xff && help
&& *help
)
4891 response
.argv
[response
.argc
++] = *help
++;
4896 case NSCTL_REQ_CONTROL
:
4898 struct param_control param
= {
4899 config
->cluster_iam_master
,
4906 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4908 if (r
== PLUGIN_RET_ERROR
)
4910 response
.type
= NSCTL_RES_ERR
;
4912 response
.argv
[0] = param
.additional
4914 : "error returned by plugin";
4916 else if (r
== PLUGIN_RET_NOTMASTER
)
4918 static char msg
[] = "must be run on master: 000.000.000.000";
4920 response
.type
= NSCTL_RES_ERR
;
4922 if (config
->cluster_master_address
)
4924 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4925 response
.argv
[0] = msg
;
4929 response
.argv
[0] = "must be run on master: none elected";
4932 else if (!(param
.response
& NSCTL_RESPONSE
))
4934 response
.type
= NSCTL_RES_ERR
;
4936 response
.argv
[0] = param
.response
4937 ? "unrecognised response value from plugin"
4938 : "unhandled action";
4942 response
.type
= param
.response
;
4944 if (param
.additional
)
4947 response
.argv
[0] = param
.additional
;
4955 response
.type
= NSCTL_RES_ERR
;
4957 response
.argv
[0] = "error unpacking control packet";
4960 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4963 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4967 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4970 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4971 if (log_stream
&& config
->debug
>= 4)
4973 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4974 dump_control(&response
, log_stream
);
4978 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4979 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4984 static tunnelidt
new_tunnel()
4987 for (i
= 1; i
< MAXTUNNEL
; i
++)
4989 if (tunnel
[i
].state
== TUNNELFREE
)
4991 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4992 if (i
> config
->cluster_highest_tunnelid
)
4993 config
->cluster_highest_tunnelid
= i
;
4997 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5002 // We're becoming the master. Do any required setup..
5004 // This is principally telling all the plugins that we're
5005 // now a master, and telling them about all the sessions
5006 // that are active too..
5008 void become_master(void)
5011 static struct event_data d
[RADIUS_FDS
];
5012 struct epoll_event e
;
5014 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
5016 // running a bunch of iptables commands is slow and can cause
5017 // the master to drop tunnels on takeover--kludge around the
5018 // problem by forking for the moment (note: race)
5019 if (!fork_and_close())
5021 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5023 if (!session
[s
].opened
) // Not an in-use session.
5026 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5033 for (i
= 0; i
< RADIUS_FDS
; i
++)
5035 d
[i
].type
= FD_TYPE_RADIUS
;
5039 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5043 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5049 if (CLI_HELP_REQUESTED
)
5050 return CLI_HELP_NO_ARGS
;
5053 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5055 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5058 if (!session
[s
].opened
)
5061 idle
= time_now
- session
[s
].last_packet
;
5062 idle
/= 5 ; // In multiples of 5 seconds.
5072 for (i
= 0; i
< 63; ++i
)
5074 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5076 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5077 cli_print(cli
, "%d total sessions open.", count
);
5081 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5087 if (CLI_HELP_REQUESTED
)
5088 return CLI_HELP_NO_ARGS
;
5091 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5093 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5096 if (!session
[s
].opened
)
5099 d
= time_now
- session
[s
].opened
;
5102 while (d
> 1 && open
< 32)
5112 for (i
= 0; i
< 30; ++i
)
5114 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5117 cli_print(cli
, "%d total sessions open.", count
);
5123 * This unencodes the AVP using the L2TP secret and the previously
5124 * stored random vector. It overwrites the hidden data with the
5125 * unhidden AVP subformat.
5127 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5133 uint16_t m
= htons(type
);
5135 // Compute initial pad
5137 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5138 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5139 MD5_Update(&ctx
, vector
, vec_len
);
5140 MD5_Final(digest
, &ctx
);
5142 // pointer to last decoded 16 octets
5147 // calculate a new pad based on the last decoded block
5148 if (d
>= sizeof(digest
))
5151 MD5_Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
5152 MD5_Update(&ctx
, last
, sizeof(digest
));
5153 MD5_Final(digest
, &ctx
);
5159 *value
++ ^= digest
[d
++];
5164 int find_filter(char const *name
, size_t len
)
5169 for (i
= 0; i
< MAXFILTER
; i
++)
5171 if (!*ip_filters
[i
].name
)
5179 if (strlen(ip_filters
[i
].name
) != len
)
5182 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5189 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5193 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5194 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5195 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5196 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5197 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5203 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5207 case FILTER_FLAG_OP_ANY
:
5208 return (flags
& sflags
) || (~flags
& cflags
);
5210 case FILTER_FLAG_OP_ALL
:
5211 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5213 case FILTER_FLAG_OP_EST
:
5214 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5220 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5222 uint16_t frag_offset
;
5226 uint16_t src_port
= 0;
5227 uint16_t dst_port
= 0;
5229 ip_filter_rulet
*rule
;
5231 if (len
< 20) // up to end of destination address
5234 if ((*buf
>> 4) != 4) // IPv4
5237 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5239 src_ip
= *(in_addr_t
*) (buf
+ 12);
5240 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5242 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5244 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5245 if (len
< l
+ 4) // ports
5248 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5249 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5250 if (proto
== IPPROTO_TCP
)
5252 if (len
< l
+ 14) // flags
5255 flags
= buf
[l
+ 13] & 0x3f;
5259 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5261 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5264 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5265 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5268 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5269 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5274 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5282 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5284 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5287 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5290 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5291 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5298 return rule
->action
== FILTER_ACTION_PERMIT
;