3 // Copyright (c) 2003, 2004, 2005, 2006 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 1.176 2011/01/20 12:48:40 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 char guest_users
[10][32]; // Array of guest users
79 int guest_accounts_num
= 0; // Number of guest users
81 // calculated from config->l2tp_mtu
82 uint16_t MRU
= 0; // PPP MRU
83 uint16_t MSS
= 0; // TCP MSS
85 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
86 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
91 } ip_hash
[256]; // Mapping from IP address to session structures.
95 struct ipv6radix
*branch
;
96 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
99 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
100 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
103 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
104 time_t time_now
= 0; // Current time in seconds since epoch.
105 static char time_now_string
[64] = {0}; // Current time as a string.
106 static int time_changed
= 0; // time_now changed
107 char main_quit
= 0; // True if we're in the process of exiting.
108 static char main_reload
= 0; // Re-load pending
109 linked_list
*loaded_plugins
;
110 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
112 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
113 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
115 config_descriptt config_values
[] = {
116 CONFIG("debug", debug
, INT
),
117 CONFIG("log_file", log_filename
, STRING
),
118 CONFIG("pid_file", pid_file
, STRING
),
119 CONFIG("random_device", random_device
, STRING
),
120 CONFIG("l2tp_secret", l2tp_secret
, STRING
),
121 CONFIG("l2tp_mtu", l2tp_mtu
, INT
),
122 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
123 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
124 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
125 CONFIG("primary_dns", default_dns1
, IPv4
),
126 CONFIG("secondary_dns", default_dns2
, IPv4
),
127 CONFIG("primary_radius", radiusserver
[0], IPv4
),
128 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
129 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
130 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
131 CONFIG("radius_accounting", radius_accounting
, BOOL
),
132 CONFIG("radius_interim", radius_interim
, INT
),
133 CONFIG("radius_secret", radiussecret
, STRING
),
134 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
135 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
136 CONFIG("radius_bind_min", radius_bind_min
, SHORT
),
137 CONFIG("radius_bind_max", radius_bind_max
, SHORT
),
138 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
139 CONFIG("kill_timedout_sessions", kill_timedout_sessions
, BOOL
),
140 CONFIG("guest_account", guest_user
, STRING
),
141 CONFIG("bind_address", bind_address
, IPv4
),
142 CONFIG("peer_address", peer_address
, IPv4
),
143 CONFIG("send_garp", send_garp
, BOOL
),
144 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
145 CONFIG("throttle_buckets", num_tbfs
, INT
),
146 CONFIG("accounting_dir", accounting_dir
, STRING
),
147 CONFIG("dump_speed", dump_speed
, BOOL
),
148 CONFIG("multi_read_count", multi_read_count
, INT
),
149 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
150 CONFIG("lock_pages", lock_pages
, BOOL
),
151 CONFIG("icmp_rate", icmp_rate
, INT
),
152 CONFIG("packet_limit", max_packets
, INT
),
153 CONFIG("cluster_address", cluster_address
, IPv4
),
154 CONFIG("cluster_interface", cluster_interface
, STRING
),
155 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl
, INT
),
156 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
157 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
158 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
159 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
160 CONFIG("cli_bind_address", cli_bind_address
, IPv4
),
164 static char *plugin_functions
[] = {
169 "plugin_new_session",
170 "plugin_kill_session",
172 "plugin_radius_response",
173 "plugin_radius_reset",
174 "plugin_radius_account",
175 "plugin_become_master",
176 "plugin_new_session_master",
179 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
181 // Counters for shutdown sessions
182 static sessiont shut_acct
[8192];
183 static sessionidt shut_acct_n
= 0;
185 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
186 bundlet
*bundle
= NULL
; // Array of bundle structures.
187 fragmentationt
*frag
= NULL
; // Array of fragmentation structures.
188 sessiont
*session
= NULL
; // Array of session structures.
189 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
190 radiust
*radius
= NULL
; // Array of radius structures.
191 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
192 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
193 static controlt
*controlfree
= 0;
194 struct Tstats
*_statistics
= NULL
;
196 struct Tringbuffer
*ringbuffer
= NULL
;
199 static void cache_ipmap(in_addr_t ip
, sessionidt s
);
200 static void uncache_ipmap(in_addr_t ip
);
201 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
);
202 static void free_ip_address(sessionidt s
);
203 static void dump_acct_info(int all
);
204 static void sighup_handler(int sig
);
205 static void shutdown_handler(int sig
);
206 static void sigchild_handler(int sig
);
207 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
208 static void update_config(void);
209 static void read_config_file(void);
210 static void initplugins(void);
211 static int add_plugin(char *plugin_name
);
212 static int remove_plugin(char *plugin_name
);
213 static void plugins_done(void);
214 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
);
215 static tunnelidt
new_tunnel(void);
216 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
217 static void bundleclear(bundleidt b
);
219 // on slaves, alow BGP to withdraw cleanly before exiting
222 // quit actions (master)
223 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
224 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
226 // return internal time (10ths since process startup), set f if given
227 // as a side-effect sets time_now, and time_changed
228 static clockt
now(double *f
)
232 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
233 if (t
.tv_sec
!= time_now
)
238 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
241 // work out a retry time based on try number
242 // This is a straight bounded exponential backoff.
243 // Maximum re-try time is 32 seconds. (2^5).
244 clockt
backoff(uint8_t try)
246 if (try > 5) try = 5; // max backoff
247 return now(NULL
) + 10 * (1 << try);
252 // Log a debug message. Typically called via the LOG macro
254 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
256 static char message
[65536] = {0};
262 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
263 ringbuffer
->tail
= 0;
264 if (ringbuffer
->tail
== ringbuffer
->head
)
265 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
266 ringbuffer
->head
= 0;
268 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
269 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
270 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
271 va_start(ap
, format
);
272 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
277 if (config
->debug
< level
) return;
279 va_start(ap
, format
);
280 vsnprintf(message
, sizeof(message
), format
, ap
);
283 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
285 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
290 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
293 const uint8_t *d
= data
;
295 if (config
->debug
< level
) return;
297 // No support for _log_hex to syslog
300 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
301 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
303 for (i
= 0; i
< maxsize
; )
305 fprintf(log_stream
, "%4X: ", i
);
306 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
308 fprintf(log_stream
, "%02X ", d
[j
]);
310 fputs(": ", log_stream
);
313 for (; j
< i
+ 16; j
++)
315 fputs(" ", log_stream
);
317 fputs(": ", log_stream
);
320 fputs(" ", log_stream
);
321 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
323 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
324 fputc(d
[j
], log_stream
);
326 fputc('.', log_stream
);
329 fputs(" ", log_stream
);
333 fputs("\n", log_stream
);
337 setbuf(log_stream
, NULL
);
341 // update a counter, accumulating 2^32 wraps
342 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
344 uint32_t new = *counter
+ delta
;
351 // initialise the random generator
352 static void initrandom(char *source
)
354 static char path
[sizeof(config
->random_device
)] = "*undefined*";
356 // reinitialise only if we are forced to do so or if the config has changed
357 if (source
&& !strncmp(path
, source
, sizeof(path
)))
360 // close previous source, if any
369 snprintf(path
, sizeof(path
), "%s", source
);
373 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
375 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
376 path
, strerror(errno
));
381 // fill buffer with random data
382 void random_data(uint8_t *buf
, int len
)
389 n
= read(rand_fd
, buf
, len
);
390 if (n
>= len
) return;
395 LOG(0, 0, 0, "Error reading from random source: %s\n",
398 // fall back to rand()
406 // append missing data
408 // not using the low order bits from the prng stream
409 buf
[n
++] = (rand() >> 4) & 0xff;
414 // This adds it to the routing table, advertises it
415 // via BGP if enabled, and stuffs it into the
416 // 'sessionbyip' cache.
418 // 'ip' and 'mask' must be in _host_ order.
420 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
425 if (!mask
) mask
= 0xffffffff;
427 ip
&= mask
; // Force the ip to be the first one in the route.
429 memset(&r
, 0, sizeof(r
));
430 r
.rt_dev
= config
->tundevice
;
431 r
.rt_dst
.sa_family
= AF_INET
;
432 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
433 r
.rt_gateway
.sa_family
= AF_INET
;
434 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
435 r
.rt_genmask
.sa_family
= AF_INET
;
436 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
437 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
439 r
.rt_flags
|= RTF_GATEWAY
;
440 else if (mask
== 0xffffffff)
441 r
.rt_flags
|= RTF_HOST
;
443 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
444 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
445 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
447 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
448 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
452 bgp_add_route(htonl(ip
), htonl(mask
));
454 bgp_del_route(htonl(ip
), htonl(mask
));
457 // Add/Remove the IPs to the 'sessionbyip' cache.
458 // Note that we add the zero address in the case of
459 // a network route. Roll on CIDR.
461 // Note that 's == 0' implies this is the address pool.
462 // We still cache it here, because it will pre-fill
463 // the malloc'ed tree.
467 if (!add
) // Are we deleting a route?
468 s
= 0; // Caching the session as '0' is the same as uncaching.
470 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
475 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
478 char ipv6addr
[INET6_ADDRSTRLEN
];
482 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
486 memset(&rt
, 0, sizeof(rt
));
488 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
489 rt
.rtmsg_dst_len
= prefixlen
;
491 rt
.rtmsg_flags
= RTF_UP
;
492 rt
.rtmsg_ifindex
= tunidx
;
494 LOG(1, 0, 0, "Route %s %s/%d\n",
496 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
499 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
500 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
503 // FIXME: need to add BGP routing (RFC2858)
507 if (!add
) // Are we deleting a route?
508 s
= 0; // Caching the session as '0' is the same as uncaching.
510 cache_ipv6map(ip
, prefixlen
, s
);
516 // defined in linux/ipv6.h, but tricky to include from user-space
517 // TODO: move routing to use netlink rather than ioctl
519 struct in6_addr ifr6_addr
;
520 __u32 ifr6_prefixlen
;
521 unsigned int ifr6_ifindex
;
525 // Set up TUN interface
526 static void inittun(void)
529 struct in6_ifreq ifr6
;
530 struct sockaddr_in sin
= {0};
531 memset(&ifr
, 0, sizeof(ifr
));
532 ifr
.ifr_flags
= IFF_TUN
;
534 tunfd
= open(TUNDEVICE
, O_RDWR
);
537 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
541 int flags
= fcntl(tunfd
, F_GETFL
, 0);
542 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
544 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
546 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
549 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
550 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
551 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
553 sin
.sin_family
= AF_INET
;
554 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
555 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
557 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
559 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
562 /* Bump up the qlen to deal with bursts from the network */
564 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
566 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
569 /* set MTU to modem MRU */
571 if (ioctl(ifrfd
, SIOCSIFMTU
, (void *) &ifr
) < 0)
573 LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno
));
576 ifr
.ifr_flags
= IFF_UP
;
577 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
579 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
582 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
584 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
587 tunidx
= ifr
.ifr_ifindex
;
589 // Only setup IPv6 on the tun device if we have a configured prefix
590 if (config
->ipv6_prefix
.s6_addr
[0]) {
591 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
593 // Link local address is FE80::1
594 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
595 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
596 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
597 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
598 ifr6
.ifr6_prefixlen
= 64;
599 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
600 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
602 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
603 " %s\n", strerror(errno
));
606 // Global address is prefix::1
607 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
608 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
609 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
610 ifr6
.ifr6_prefixlen
= 64;
611 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
612 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
614 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
621 static void initudp(void)
624 struct sockaddr_in addr
;
627 memset(&addr
, 0, sizeof(addr
));
628 addr
.sin_family
= AF_INET
;
629 addr
.sin_port
= htons(L2TPPORT
);
630 addr
.sin_addr
.s_addr
= config
->bind_address
;
631 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
632 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
634 int flags
= fcntl(udpfd
, F_GETFL
, 0);
635 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
637 if (bind(udpfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
639 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
644 memset(&addr
, 0, sizeof(addr
));
645 addr
.sin_family
= AF_INET
;
646 addr
.sin_port
= htons(NSCTL_PORT
);
647 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
648 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
649 setsockopt(controlfd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
650 if (bind(controlfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
652 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
656 // Dynamic Authorization Extensions to RADIUS
657 memset(&addr
, 0, sizeof(addr
));
658 addr
.sin_family
= AF_INET
;
659 addr
.sin_port
= htons(config
->radius_dae_port
);
660 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
661 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
662 setsockopt(daefd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
663 if (bind(daefd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
665 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
670 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
674 // Find session by IP, < 1 for not found
676 // Confusingly enough, this 'ip' must be
677 // in _network_ order. This being the common
678 // case when looking it up from IP packet headers.
680 // We actually use this cache for two things.
681 // #1. For used IP addresses, this maps to the
682 // session ID that it's used by.
683 // #2. For un-used IP addresses, this maps to the
684 // index into the pool table that contains that
688 static sessionidt
lookup_ipmap(in_addr_t ip
)
690 uint8_t *a
= (uint8_t *) &ip
;
691 union iphash
*h
= ip_hash
;
693 if (!(h
= h
[*a
++].idx
)) return 0;
694 if (!(h
= h
[*a
++].idx
)) return 0;
695 if (!(h
= h
[*a
++].idx
)) return 0;
700 static sessionidt
lookup_ipv6map(struct in6_addr ip
)
702 struct ipv6radix
*curnode
;
705 char ipv6addr
[INET6_ADDRSTRLEN
];
707 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
711 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
713 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
718 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
719 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
726 sessionidt
sessionbyip(in_addr_t ip
)
728 sessionidt s
= lookup_ipmap(ip
);
731 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
737 sessionidt
sessionbyipv6(struct in6_addr ip
)
740 CSTAT(sessionbyipv6
);
742 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
743 (ip
.s6_addr
[0] == 0xFE &&
744 ip
.s6_addr
[1] == 0x80 &&
745 ip
.s6_addr16
[1] == 0 &&
746 ip
.s6_addr16
[2] == 0 &&
747 ip
.s6_addr16
[3] == 0)) {
748 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
750 s
= lookup_ipv6map(ip
);
753 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
760 // Take an IP address in HOST byte order and
761 // add it to the sessionid by IP cache.
763 // (It's actually cached in network order)
765 static void cache_ipmap(in_addr_t ip
, sessionidt s
)
767 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
768 uint8_t *a
= (uint8_t *) &nip
;
769 union iphash
*h
= ip_hash
;
772 for (i
= 0; i
< 3; i
++)
774 if (!(h
[a
[i
]].idx
|| (h
[a
[i
]].idx
= calloc(256, sizeof(union iphash
)))))
783 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
786 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
787 // else a map to an ip pool index.
790 static void uncache_ipmap(in_addr_t ip
)
792 cache_ipmap(ip
, 0); // Assign it to the NULL session.
795 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
)
799 struct ipv6radix
*curnode
;
800 char ipv6addr
[INET6_ADDRSTRLEN
];
802 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
804 bytes
= prefixlen
>> 3;
807 if (curnode
->branch
== NULL
)
809 if (!(curnode
->branch
= calloc(256,
810 sizeof (struct ipv6radix
))))
813 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
820 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
821 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
825 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
826 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
832 // CLI list to dump current ipcache.
834 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
836 union iphash
*d
= ip_hash
, *e
, *f
, *g
;
840 if (CLI_HELP_REQUESTED
)
841 return CLI_HELP_NO_ARGS
;
843 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
845 for (i
= 0; i
< 256; ++i
)
851 for (j
= 0; j
< 256; ++j
)
857 for (k
= 0; k
< 256; ++k
)
863 for (l
= 0; l
< 256; ++l
)
868 cli_print(cli
, "%7d %d.%d.%d.%d", g
[l
].sess
, i
, j
, k
, l
);
874 cli_print(cli
, "%d entries in cache", count
);
879 // Find session by username, 0 for not found
880 // walled garden users aren't authenticated, so the username is
881 // reasonably useless. Ignore them to avoid incorrect actions
883 // This is VERY inefficent. Don't call it often. :)
885 sessionidt
sessionbyuser(char *username
)
888 CSTAT(sessionbyuser
);
890 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
892 if (!session
[s
].opened
)
895 if (session
[s
].walled_garden
)
896 continue; // Skip walled garden users.
898 if (!strncmp(session
[s
].user
, username
, 128))
902 return 0; // Not found.
905 void send_garp(in_addr_t ip
)
911 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
914 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
917 memset(&ifr
, 0, sizeof(ifr
));
918 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
919 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
921 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
925 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
926 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
928 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
933 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
936 static sessiont
*sessiontbysessionidt(sessionidt s
)
938 if (!s
|| s
>= MAXSESSION
) return NULL
;
942 static sessionidt
sessionidtbysessiont(sessiont
*s
)
944 sessionidt val
= s
-session
;
945 if (s
< session
|| val
>= MAXSESSION
) return 0;
949 // actually send a control message for a specific tunnel
950 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
952 struct sockaddr_in addr
;
958 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
959 STAT(tunnel_tx_errors
);
965 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
966 STAT(tunnel_tx_errors
);
970 memset(&addr
, 0, sizeof(addr
));
971 addr
.sin_family
= AF_INET
;
972 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
973 addr
.sin_port
= htons(tunnel
[t
].port
);
975 // sequence expected, if sequence in message
976 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
978 // If this is a control message, deal with retries
981 tunnel
[t
].last
= time_now
; // control message sent
982 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
985 STAT(tunnel_retries
);
986 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
990 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
992 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
993 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
994 STAT(tunnel_tx_errors
);
998 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
999 STAT(tunnel_tx_packets
);
1000 INC_STAT(tunnel_tx_bytes
, l
);
1004 // Tiny helper function to write data to
1005 // the 'tun' device.
1007 int tun_write(uint8_t * data
, int size
)
1009 return write(tunfd
, data
, size
);
1012 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1013 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1015 int d
= (tcp
[12] >> 4) * 4;
1022 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1025 if (tcp
+ d
> buf
+ len
) // short?
1033 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1036 if (mss
+ 2 > data
) return; // short?
1040 if (*opts
== 0) return; // end of options
1041 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1044 opts
+= opts
[1]; // skip over option
1047 if (!mss
) return; // not found
1048 orig
= ntohs(*(uint16_t *) mss
);
1050 if (orig
<= MSS
) return; // mss OK
1052 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1053 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1054 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1055 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1058 *(int16_t *) mss
= htons(MSS
);
1060 // adjust checksum (see rfc1141)
1061 sum
= orig
+ (~MSS
& 0xffff);
1062 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1063 sum
= (sum
& 0xffff) + (sum
>> 16);
1064 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1067 void processmpframe(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint8_t extra
)
1071 // Skip the four extra bytes
1083 proto
= ntohs(*(uint16_t *) p
);
1091 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1092 return; // closing session, PPP not processed
1094 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1095 processipin(s
, t
, p
, l
);
1097 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
1101 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1102 return; // closing session, PPP not processed
1105 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1106 processipv6in(s
, t
, p
, l
);
1108 else if (proto
== PPPIPCP
)
1110 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1111 processipcp(s
, t
, p
, l
);
1113 else if (proto
== PPPCCP
)
1115 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1116 processccp(s
, t
, p
, l
);
1120 LOG(2, s
, t
, "MPPP: Unsupported MP protocol 0x%04X received\n",proto
);
1124 static void update_session_out_stat(sessionidt s
, sessiont
*sp
, int len
)
1126 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1127 sp
->cout_delta
+= len
;
1129 sp
->last_data
= time_now
;
1131 sess_local
[s
].cout
+= len
; // To send to master..
1132 sess_local
[s
].pout
++;
1135 // process outgoing (to tunnel) IP
1137 static void processipout(uint8_t *buf
, int len
)
1144 uint8_t *data
= buf
; // Keep a copy of the originals.
1147 uint8_t fragbuf
[MAXETHER
+ 20];
1149 CSTAT(processipout
);
1151 if (len
< MIN_IP_SIZE
)
1153 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1154 STAT(tun_rx_errors
);
1157 if (len
>= MAXETHER
)
1159 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1160 STAT(tun_rx_errors
);
1164 // Skip the tun header
1168 // Got an IP header now
1169 if (*(uint8_t *)(buf
) >> 4 != 4)
1171 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1175 ip
= *(uint32_t *)(buf
+ 16);
1176 if (!(s
= sessionbyip(ip
)))
1178 // Is this a packet for a session that doesn't exist?
1179 static int rate
= 0; // Number of ICMP packets we've sent this second.
1180 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1182 if (last
!= time_now
)
1188 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1190 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1191 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1192 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1197 t
= session
[s
].tunnel
;
1198 if (len
> session
[s
].mru
|| (session
[s
].mrru
&& len
> session
[s
].mrru
))
1200 LOG(3, s
, t
, "Packet size more than session MRU\n");
1206 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1207 if (config
->max_packets
> 0)
1209 if (sess_local
[s
].last_packet_out
== TIME
)
1211 int max
= config
->max_packets
;
1213 // All packets for throttled sessions are handled by the
1214 // master, so further limit by using the throttle rate.
1215 // A bit of a kludge, since throttle rate is in kbps,
1216 // but should still be generous given our average DSL
1217 // packet size is 200 bytes: a limit of 28kbps equates
1218 // to around 180 packets per second.
1219 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1220 max
= sp
->throttle_out
;
1222 if (++sess_local
[s
].packets_out
> max
)
1224 sess_local
[s
].packets_dropped
++;
1230 if (sess_local
[s
].packets_dropped
)
1232 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1233 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1234 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1235 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1239 sess_local
[s
].last_packet_out
= TIME
;
1240 sess_local
[s
].packets_out
= 1;
1241 sess_local
[s
].packets_dropped
= 0;
1245 // run access-list if any
1246 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1249 // adjust MSS on SYN and SYN,ACK packets with options
1250 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1252 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1253 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1254 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1259 // Are we throttling this session?
1260 if (config
->cluster_iam_master
)
1261 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1263 master_throttle_packet(sp
->tbf_out
, data
, size
);
1267 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1269 // We are walled-gardening this
1270 master_garden_packet(s
, data
, size
);
1274 // Add on L2TP header
1277 if(session
[s
].bundle
!= 0 && bundle
[session
[s
].bundle
].num_of_links
> 1)
1279 bid
= session
[s
].bundle
;
1280 s
= bundle
[bid
].members
[bundle
[bid
].current_ses
= ++bundle
[bid
].current_ses
% bundle
[bid
].num_of_links
];
1281 t
= session
[s
].tunnel
;
1283 LOG(4, s
, t
, "MPPP: (1)Session number becomes: %d\n", s
);
1284 if(len
> MINFRAGLEN
)
1286 // Partition the packet to "bundle[b].num_of_links" fragments
1287 bundlet
*b
= &bundle
[bid
];
1288 uint32_t num_of_links
= b
->num_of_links
;
1289 uint32_t fraglen
= len
/ num_of_links
;
1290 fraglen
= (fraglen
> session
[s
].mru
? session
[s
].mru
: fraglen
);
1291 uint32_t last_fraglen
= fraglen
+ len
% num_of_links
;
1292 last_fraglen
= (last_fraglen
> session
[s
].mru
? len
% num_of_links
: last_fraglen
);
1293 uint32_t remain
= len
;
1295 // send the first packet
1296 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, fraglen
, s
, t
, PPPIP
, 0, bid
, MP_BEGIN
);
1298 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1300 update_session_out_stat(s
, sp
, fraglen
);
1302 while (remain
> last_fraglen
)
1304 s
= b
->members
[b
->current_ses
= ++b
->current_ses
% num_of_links
];
1305 t
= session
[s
].tunnel
;
1307 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1308 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), fraglen
, s
, t
, PPPIP
, 0, bid
, 0);
1310 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1311 update_session_out_stat(s
, sp
, fraglen
);
1314 // send the last fragment
1315 s
= b
->members
[b
->current_ses
= ++b
->current_ses
% num_of_links
];
1316 t
= session
[s
].tunnel
;
1318 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1319 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), remain
, s
, t
, PPPIP
, 0, bid
, MP_END
);
1321 tunnelsend(fragbuf
, remain
+ (p
-fragbuf
), t
); // send it...
1322 update_session_out_stat(s
, sp
, remain
);
1323 if (remain
!= last_fraglen
)
1324 LOG(3, s
, t
, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain
, last_fraglen
);
1327 // Send it as one frame
1328 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, bid
, MP_BOTH_BITS
);
1330 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1331 LOG(4, s
, t
, "MPPP: packet sent as one frame\n");
1332 update_session_out_stat(s
, sp
, len
);
1337 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1339 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1340 update_session_out_stat(s
, sp
, len
);
1344 // Snooping this session, send it to intercept box
1345 if (sp
->snoop_ip
&& sp
->snoop_port
)
1346 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1351 // process outgoing (to tunnel) IPv6
1353 static void processipv6out(uint8_t * buf
, int len
)
1359 struct in6_addr ip6
;
1361 uint8_t *data
= buf
; // Keep a copy of the originals.
1364 uint8_t b
[MAXETHER
+ 20];
1366 CSTAT(processipv6out
);
1368 if (len
< MIN_IP_SIZE
)
1370 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1371 STAT(tunnel_tx_errors
);
1374 if (len
>= MAXETHER
)
1376 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1377 STAT(tunnel_tx_errors
);
1381 // Skip the tun header
1385 // Got an IP header now
1386 if (*(uint8_t *)(buf
) >> 4 != 6)
1388 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1392 ip6
= *(struct in6_addr
*)(buf
+24);
1393 s
= sessionbyipv6(ip6
);
1397 ip
= *(uint32_t *)(buf
+ 32);
1398 s
= sessionbyip(ip
);
1403 // Is this a packet for a session that doesn't exist?
1404 static int rate
= 0; // Number of ICMP packets we've sent this second.
1405 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1407 if (last
!= time_now
)
1413 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1415 // FIXME: Should send icmp6 host unreachable
1419 if (session
[s
].bundle
&& bundle
[session
[s
].bundle
].num_of_links
> 1)
1421 bundleidt bid
= session
[s
].bundle
;
1422 s
= bundle
[bid
].members
[bundle
[bid
].current_ses
= ++bundle
[bid
].current_ses
% bundle
[bid
].num_of_links
];
1423 LOG(3, s
, session
[s
].tunnel
, "MPPP: Session number becomes: %u\n", s
);
1425 t
= session
[s
].tunnel
;
1427 sp
->last_data
= time_now
;
1429 // FIXME: add DoS prevention/filters?
1433 // Are we throttling this session?
1434 if (config
->cluster_iam_master
)
1435 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1437 master_throttle_packet(sp
->tbf_out
, data
, size
);
1440 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1442 // We are walled-gardening this
1443 master_garden_packet(s
, data
, size
);
1447 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1449 // Add on L2TP header
1451 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0);
1453 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1456 // Snooping this session, send it to intercept box
1457 if (sp
->snoop_ip
&& sp
->snoop_port
)
1458 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1460 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1461 sp
->cout_delta
+= len
;
1465 sess_local
[s
].cout
+= len
; // To send to master..
1466 sess_local
[s
].pout
++;
1470 // Helper routine for the TBF filters.
1471 // Used to send queued data in to the user!
1473 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1479 uint8_t b
[MAXETHER
+ 20];
1481 if (len
< 0 || len
> MAXETHER
)
1483 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1487 // Skip the tun header
1491 ip
= *(in_addr_t
*)(buf
+ 16);
1496 t
= session
[s
].tunnel
;
1499 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1501 // Add on L2TP header
1503 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1505 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1508 // Snooping this session.
1509 if (sp
->snoop_ip
&& sp
->snoop_port
)
1510 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1512 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1513 sp
->cout_delta
+= len
;
1517 sess_local
[s
].cout
+= len
; // To send to master..
1518 sess_local
[s
].pout
++;
1521 // add an AVP (16 bit)
1522 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1524 uint16_t l
= (m
? 0x8008 : 0x0008);
1525 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1526 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1527 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1528 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1532 // add an AVP (32 bit)
1533 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1535 uint16_t l
= (m
? 0x800A : 0x000A);
1536 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1537 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1538 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1539 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1543 // add an AVP (string)
1544 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1546 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1547 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1548 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1549 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1550 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1551 c
->length
+= 6 + strlen(val
);
1555 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1557 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1558 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1559 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1560 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1561 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1562 c
->length
+= 6 + len
;
1565 // new control connection
1566 static controlt
*controlnew(uint16_t mtype
)
1570 c
= malloc(sizeof(controlt
));
1574 controlfree
= c
->next
;
1578 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1580 control16(c
, 0, mtype
, 1);
1584 // send zero block if nothing is waiting
1586 static void controlnull(tunnelidt t
)
1589 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1592 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1593 *(uint16_t *) (buf
+ 2) = htons(12); // length
1594 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1595 *(uint16_t *) (buf
+ 6) = htons(0); // session
1596 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1597 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1598 tunnelsend(buf
, 12, t
);
1601 // add a control message to a tunnel, and send if within window
1602 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1604 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1605 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1606 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1607 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1608 tunnel
[t
].ns
++; // advance sequence
1609 // link in message in to queue
1610 if (tunnel
[t
].controlc
)
1611 tunnel
[t
].controle
->next
= c
;
1613 tunnel
[t
].controls
= c
;
1615 tunnel
[t
].controle
= c
;
1616 tunnel
[t
].controlc
++;
1618 // send now if space in window
1619 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1621 tunnel
[t
].try = 0; // first send
1622 tunnelsend(c
->buf
, c
->length
, t
);
1627 // Throttle or Unthrottle a session
1629 // Throttle the data from/to through a session to no more than
1630 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1633 // If either value is -1, the current value is retained for that
1636 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1638 if (!session
[s
].opened
)
1639 return; // No-one home.
1641 if (!*session
[s
].user
)
1642 return; // User not logged in
1646 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1647 if (session
[s
].tbf_in
)
1648 free_tbf(session
[s
].tbf_in
);
1651 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1653 session
[s
].tbf_in
= 0;
1655 session
[s
].throttle_in
= rate_in
;
1660 int bytes
= rate_out
* 1024 / 8;
1661 if (session
[s
].tbf_out
)
1662 free_tbf(session
[s
].tbf_out
);
1665 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1667 session
[s
].tbf_out
= 0;
1669 session
[s
].throttle_out
= rate_out
;
1673 // add/remove filters from session (-1 = no change)
1674 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1676 if (!session
[s
].opened
)
1677 return; // No-one home.
1679 if (!*session
[s
].user
)
1680 return; // User not logged in
1683 if (filter_in
> MAXFILTER
) filter_in
= -1;
1684 if (filter_out
> MAXFILTER
) filter_out
= -1;
1685 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1686 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1690 if (session
[s
].filter_in
)
1691 ip_filters
[session
[s
].filter_in
- 1].used
--;
1694 ip_filters
[filter_in
- 1].used
++;
1696 session
[s
].filter_in
= filter_in
;
1699 if (filter_out
>= 0)
1701 if (session
[s
].filter_out
)
1702 ip_filters
[session
[s
].filter_out
- 1].used
--;
1705 ip_filters
[filter_out
- 1].used
++;
1707 session
[s
].filter_out
= filter_out
;
1711 // start tidy shutdown of session
1712 void sessionshutdown(sessionidt s
, char const *reason
, int cdn_result
, int cdn_error
, int term_cause
)
1714 int walled_garden
= session
[s
].walled_garden
;
1715 bundleidt b
= session
[s
].bundle
;
1716 //delete routes only for last session in bundle (in case of MPPP)
1717 int del_routes
= !b
|| (bundle
[b
].num_of_links
== 1);
1719 CSTAT(sessionshutdown
);
1721 if (!session
[s
].opened
)
1723 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1724 return; // not a live session
1727 if (!session
[s
].die
)
1729 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1730 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %u: %s\n", s
, reason
);
1731 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1732 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1735 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1737 // RADIUS Stop message
1738 uint16_t r
= radiusnew(s
);
1741 // stop, if not already trying
1742 if (radius
[r
].state
!= RADIUSSTOP
)
1744 radius
[r
].term_cause
= term_cause
;
1745 radius
[r
].term_msg
= reason
;
1746 radiussend(r
, RADIUSSTOP
);
1750 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1752 // Save counters to dump to accounting file
1753 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1754 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1758 { // IP allocated, clear and unroute
1761 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1763 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1764 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1767 if (del_routes
) routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1768 session
[s
].route
[r
].ip
= 0;
1771 if (session
[s
].ip_pool_index
== -1) // static ip
1773 if (!routed
&& del_routes
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1779 // unroute IPv6, if setup
1780 if (session
[s
].ppp
.ipv6cp
== Opened
&& session
[s
].ipv6prefixlen
&& del_routes
)
1781 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1785 // This session was part of a bundle
1786 bundle
[b
].num_of_links
--;
1787 LOG(3, s
, 0, "MPPP: Dropping member link: %d from bundle %d\n",s
,b
);
1788 if(bundle
[b
].num_of_links
== 0)
1791 LOG(3, s
, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b
);
1795 // Adjust the members array to accomodate the new change
1796 uint8_t mem_num
= 0;
1797 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
1798 if(bundle
[b
].members
[bundle
[b
].num_of_links
] != s
)
1801 for(ml
= 0; ml
<bundle
[b
].num_of_links
; ml
++)
1802 if(bundle
[b
].members
[ml
] == s
)
1807 bundle
[b
].members
[mem_num
] = bundle
[b
].members
[bundle
[b
].num_of_links
];
1808 LOG(3, s
, 0, "MPPP: Adjusted member links array\n");
1811 cluster_send_bundle(b
);
1815 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1816 throttle_session(s
, 0, 0);
1820 controlt
*c
= controlnew(14); // sending CDN
1824 *(uint16_t *) buf
= htons(cdn_result
);
1825 *(uint16_t *) (buf
+2) = htons(cdn_error
);
1826 controlb(c
, 1, buf
, 4, 1);
1829 control16(c
, 1, cdn_result
, 1);
1831 control16(c
, 14, s
, 1); // assigned session (our end)
1832 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
1835 // update filter refcounts
1836 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1837 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1840 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
1841 sess_local
[s
].lcp
.restart
= 0;
1842 sess_local
[s
].ipcp
.restart
= 0;
1843 sess_local
[s
].ipv6cp
.restart
= 0;
1844 sess_local
[s
].ccp
.restart
= 0;
1846 cluster_send_session(s
);
1849 void sendipcp(sessionidt s
, tunnelidt t
)
1851 uint8_t buf
[MAXETHER
];
1855 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
1857 if (!session
[s
].unique_id
)
1859 if (!++last_id
) ++last_id
; // skip zero
1860 session
[s
].unique_id
= last_id
;
1863 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
, 0, 0, 0);
1867 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
1868 *(uint16_t *) (q
+ 2) = htons(10); // packet length
1869 q
[4] = 3; // ip address option
1870 q
[5] = 6; // option length
1871 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1872 config
->bind_address
? config
->bind_address
:
1873 my_address
; // send my IP
1875 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1876 restart_timer(s
, ipcp
);
1879 void sendipv6cp(sessionidt s
, tunnelidt t
)
1881 uint8_t buf
[MAXETHER
];
1885 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
1887 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
, 0, 0, 0);
1891 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
1892 // only send one type
1894 *(uint16_t *) (q
+ 2) = htons(14);
1895 q
[4] = 1; // interface identifier option
1896 q
[5] = 10; // option length
1897 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1898 *(uint32_t *) (q
+ 10) = 0;
1901 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1902 restart_timer(s
, ipv6cp
);
1905 static void sessionclear(sessionidt s
)
1907 memset(&session
[s
], 0, sizeof(session
[s
]));
1908 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1909 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1911 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1912 session
[s
].next
= sessionfree
;
1916 // kill a session now
1917 void sessionkill(sessionidt s
, char *reason
)
1921 if (!session
[s
].opened
) // not alive
1924 if (session
[s
].next
)
1926 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%u)\n", session
[s
].next
);
1930 if (!session
[s
].die
)
1931 sessionshutdown(s
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
1933 if (sess_local
[s
].radius
)
1934 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1936 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1938 cluster_send_session(s
);
1941 static void tunnelclear(tunnelidt t
)
1944 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1945 tunnel
[t
].state
= TUNNELFREE
;
1948 static void bundleclear(bundleidt b
)
1951 memset(&bundle
[b
], 0, sizeof(bundle
[b
]));
1952 bundle
[b
].state
= BUNDLEFREE
;
1955 // kill a tunnel now
1956 static void tunnelkill(tunnelidt t
, char *reason
)
1963 tunnel
[t
].state
= TUNNELDIE
;
1965 // free control messages
1966 while ((c
= tunnel
[t
].controls
))
1968 controlt
* n
= c
->next
;
1969 tunnel
[t
].controls
= n
;
1970 tunnel
[t
].controlc
--;
1971 c
->next
= controlfree
;
1975 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1976 if (session
[s
].tunnel
== t
)
1977 sessionkill(s
, reason
);
1981 LOG(1, 0, t
, "Kill tunnel %u: %s\n", t
, reason
);
1982 cli_tunnel_actions
[t
].action
= 0;
1983 cluster_send_tunnel(t
);
1986 // shut down a tunnel cleanly
1987 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1991 CSTAT(tunnelshutdown
);
1993 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1995 // never set up, can immediately kill
1996 tunnelkill(t
, reason
);
1999 LOG(1, 0, t
, "Shutting down tunnel %u (%s)\n", t
, reason
);
2002 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2003 if (session
[s
].tunnel
== t
)
2004 sessionshutdown(s
, reason
, CDN_NONE
, TERM_ADMIN_RESET
);
2006 tunnel
[t
].state
= TUNNELDIE
;
2007 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
2008 cluster_send_tunnel(t
);
2009 // TBA - should we wait for sessions to stop?
2012 controlt
*c
= controlnew(4); // sending StopCCN
2017 *(uint16_t *) buf
= htons(result
);
2018 *(uint16_t *) (buf
+2) = htons(error
);
2021 int m
= strlen(msg
);
2022 if (m
+ 4 > sizeof(buf
))
2023 m
= sizeof(buf
) - 4;
2025 memcpy(buf
+4, msg
, m
);
2029 controlb(c
, 1, buf
, l
, 1);
2032 control16(c
, 1, result
, 1);
2034 control16(c
, 9, t
, 1); // assigned tunnel (our end)
2035 controladd(c
, 0, t
); // send the message
2039 // read and process packet on tunnel (UDP)
2040 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
2042 uint8_t *chapresponse
= NULL
;
2043 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
2044 uint8_t *p
= buf
+ 2;
2051 LOG_HEX(5, "UDP Data", buf
, len
);
2052 STAT(tunnel_rx_packets
);
2053 INC_STAT(tunnel_rx_bytes
, len
);
2056 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
2057 STAT(tunnel_rx_errors
);
2060 if ((buf
[1] & 0x0F) != 2)
2062 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf
[1] & 0x0F);
2063 STAT(tunnel_rx_errors
);
2068 l
= ntohs(*(uint16_t *) p
);
2071 t
= ntohs(*(uint16_t *) p
);
2073 s
= ntohs(*(uint16_t *) p
);
2075 if (s
>= MAXSESSION
)
2077 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
2078 STAT(tunnel_rx_errors
);
2083 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
2084 STAT(tunnel_rx_errors
);
2089 ns
= ntohs(*(uint16_t *) p
);
2091 nr
= ntohs(*(uint16_t *) p
);
2096 uint16_t o
= ntohs(*(uint16_t *) p
);
2101 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
2102 STAT(tunnel_rx_errors
);
2107 // used to time out old tunnels
2108 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
2109 tunnel
[t
].lastrec
= time_now
;
2113 uint16_t message
= 0xFFFF; // message type
2115 uint8_t mandatory
= 0;
2116 uint16_t asession
= 0; // assigned session
2117 uint32_t amagic
= 0; // magic number
2118 uint8_t aflags
= 0; // flags from last LCF
2119 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2120 char called
[MAXTEL
] = ""; // called number
2121 char calling
[MAXTEL
] = ""; // calling number
2123 if (!config
->cluster_iam_master
)
2125 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2129 // control messages must have bits 0x80|0x40|0x08
2130 // (type, length and sequence) set, and bits 0x02|0x01
2131 // (offset and priority) clear
2132 if ((*buf
& 0xCB) != 0xC8)
2134 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
2135 STAT(tunnel_rx_errors
);
2139 // check for duplicate tunnel open message
2145 // Is this a duplicate of the first packet? (SCCRQ)
2147 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
2149 if (tunnel
[i
].state
!= TUNNELOPENING
||
2150 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
2151 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
2154 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
2159 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2160 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
2162 // if no tunnel specified, assign one
2165 if (!(t
= new_tunnel()))
2167 LOG(1, 0, 0, "No more tunnels\n");
2168 STAT(tunnel_overflow
);
2172 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
2173 tunnel
[t
].port
= ntohs(addr
->sin_port
);
2174 tunnel
[t
].window
= 4; // default window
2175 STAT(tunnel_created
);
2176 LOG(1, 0, t
, " New tunnel from %s:%u ID %u\n",
2177 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
2180 // If the 'ns' just received is not the 'nr' we're
2181 // expecting, just send an ack and drop it.
2183 // if 'ns' is less, then we got a retransmitted packet.
2184 // if 'ns' is greater than missed a packet. Either way
2185 // we should ignore it.
2186 if (ns
!= tunnel
[t
].nr
)
2188 // is this the sequence we were expecting?
2189 STAT(tunnel_rx_errors
);
2190 LOG(1, 0, t
, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2191 t
, ns
, tunnel
[t
].nr
);
2193 if (l
) // Is this not a ZLB?
2198 // check sequence of this message
2200 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2201 // some to clear maybe?
2202 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2204 controlt
*c
= tunnel
[t
].controls
;
2205 tunnel
[t
].controls
= c
->next
;
2206 tunnel
[t
].controlc
--;
2207 c
->next
= controlfree
;
2210 tunnel
[t
].try = 0; // we have progress
2213 // receiver advance (do here so quoted correctly in any sends below)
2214 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2215 if (skip
< 0) skip
= 0;
2216 if (skip
< tunnel
[t
].controlc
)
2218 // some control packets can now be sent that were previous stuck out of window
2219 int tosend
= tunnel
[t
].window
- skip
;
2220 controlt
*c
= tunnel
[t
].controls
;
2228 tunnel
[t
].try = 0; // first send
2229 tunnelsend(c
->buf
, c
->length
, t
);
2234 if (!tunnel
[t
].controlc
)
2235 tunnel
[t
].retry
= 0; // caught up
2238 { // if not a null message
2243 // Default disconnect cause/message on receipt of CDN. Set to
2244 // more specific value from attribute 1 (result code) or 46
2245 // (disconnect cause) if present below.
2246 int disc_cause_set
= 0;
2247 int disc_cause
= TERM_NAS_REQUEST
;
2248 char const *disc_reason
= "Closed (Received CDN).";
2251 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2253 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2260 LOG(1, s
, t
, "Invalid length in AVP\n");
2261 STAT(tunnel_rx_errors
);
2266 if (flags
& 0x3C) // reserved bits, should be clear
2268 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2270 result
= 2; // general error
2271 error
= 3; // reserved field non-zero
2276 if (*(uint16_t *) (b
))
2278 LOG(2, s
, t
, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b
)));
2280 result
= 2; // general error
2281 error
= 6; // generic vendor-specific error
2282 msg
= "unsupported vendor-specific";
2286 mtype
= ntohs(*(uint16_t *) (b
));
2294 // handle hidden AVPs
2295 if (!*config
->l2tp_secret
)
2297 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2299 result
= 2; // general error
2300 error
= 6; // generic vendor-specific error
2301 msg
= "secret not specified";
2304 if (!session
[s
].random_vector_length
)
2306 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2308 result
= 2; // general error
2309 error
= 6; // generic
2310 msg
= "no random vector";
2315 LOG(2, s
, t
, "Short hidden AVP.\n");
2317 result
= 2; // general error
2318 error
= 2; // length is wrong
2324 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2326 orig_len
= ntohs(*(uint16_t *) b
);
2327 if (orig_len
> n
+ 2)
2329 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2333 result
= 2; // general error
2334 error
= 2; // length is wrong
2343 LOG(4, s
, t
, " AVP %u (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2344 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2348 case 0: // message type
2349 message
= ntohs(*(uint16_t *) b
);
2350 mandatory
= flags
& 0x80;
2351 LOG(4, s
, t
, " Message type = %u (%s)\n", *b
, l2tp_code(message
));
2353 case 1: // result code
2355 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2356 char const *resdesc
= "(unknown)";
2357 char const *errdesc
= NULL
;
2362 resdesc
= l2tp_stopccn_result_code(rescode
);
2363 cause
= TERM_LOST_SERVICE
;
2365 else if (message
== 14)
2367 resdesc
= l2tp_cdn_result_code(rescode
);
2369 cause
= TERM_LOST_CARRIER
;
2371 cause
= TERM_ADMIN_RESET
;
2374 LOG(4, s
, t
, " Result Code %u: %s\n", rescode
, resdesc
);
2377 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2378 errdesc
= l2tp_error_code(errcode
);
2379 LOG(4, s
, t
, " Error Code %u: %s\n", errcode
, errdesc
);
2382 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2384 if (cause
&& disc_cause_set
< mtype
) // take cause from attrib 46 in preference
2386 disc_cause_set
= mtype
;
2387 disc_reason
= errdesc
? errdesc
: resdesc
;
2394 case 2: // protocol version
2396 version
= ntohs(*(uint16_t *) (b
));
2397 LOG(4, s
, t
, " Protocol version = %u\n", version
);
2398 if (version
&& version
!= 0x0100)
2399 { // allow 0.0 and 1.0
2400 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2402 result
= 5; // unspported protocol version
2403 error
= 0x0100; // supported version
2409 case 3: // framing capabilities
2411 case 4: // bearer capabilities
2413 case 5: // tie breaker
2414 // We never open tunnels, so we don't care about tie breakers
2416 case 6: // firmware revision
2418 case 7: // host name
2419 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2420 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2421 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2422 // TBA - to send to RADIUS
2424 case 8: // vendor name
2425 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2426 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2427 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2429 case 9: // assigned tunnel
2430 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2431 LOG(4, s
, t
, " Remote tunnel id = %u\n", tunnel
[t
].far
);
2433 case 10: // rx window
2434 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2435 if (!tunnel
[t
].window
)
2436 tunnel
[t
].window
= 1; // window of 0 is silly
2437 LOG(4, s
, t
, " rx window = %u\n", tunnel
[t
].window
);
2439 case 11: // Challenge
2441 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2442 build_chap_response(b
, 2, n
, &chapresponse
);
2445 case 13: // Response
2446 // Why did they send a response? We never challenge.
2447 LOG(2, s
, t
, " received unexpected challenge response\n");
2450 case 14: // assigned session
2451 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2452 LOG(4, s
, t
, " assigned session = %u\n", asession
);
2454 case 15: // call serial number
2455 LOG(4, s
, t
, " call serial number = %u\n", ntohl(*(uint32_t *)b
));
2457 case 18: // bearer type
2458 LOG(4, s
, t
, " bearer type = %u\n", ntohl(*(uint32_t *)b
));
2461 case 19: // framing type
2462 LOG(4, s
, t
, " framing type = %u\n", ntohl(*(uint32_t *)b
));
2465 case 21: // called number
2466 memset(called
, 0, sizeof(called
));
2467 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2468 LOG(4, s
, t
, " Called <%s>\n", called
);
2470 case 22: // calling number
2471 memset(calling
, 0, sizeof(calling
));
2472 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2473 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2477 case 24: // tx connect speed
2480 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2484 // AS5300s send connect speed as a string
2486 memset(tmp
, 0, sizeof(tmp
));
2487 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2488 session
[s
].tx_connect_speed
= atol(tmp
);
2490 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2492 case 38: // rx connect speed
2495 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2499 // AS5300s send connect speed as a string
2501 memset(tmp
, 0, sizeof(tmp
));
2502 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2503 session
[s
].rx_connect_speed
= atol(tmp
);
2505 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2507 case 25: // Physical Channel ID
2509 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2510 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2513 case 29: // Proxy Authentication Type
2515 uint16_t atype
= ntohs(*(uint16_t *)b
);
2516 LOG(4, s
, t
, " Proxy Auth Type %u (%s)\n", atype
, ppp_auth_type(atype
));
2519 case 30: // Proxy Authentication Name
2522 memset(authname
, 0, sizeof(authname
));
2523 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2524 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2528 case 31: // Proxy Authentication Challenge
2530 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2533 case 32: // Proxy Authentication ID
2535 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2536 LOG(4, s
, t
, " Proxy Auth ID (%u)\n", authid
);
2539 case 33: // Proxy Authentication Response
2540 LOG(4, s
, t
, " Proxy Auth Response\n");
2542 case 27: // last sent lcp
2543 { // find magic number
2544 uint8_t *p
= b
, *e
= p
+ n
;
2545 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2547 if (*p
== 5 && p
[1] == 6) // Magic-Number
2548 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2549 else if (*p
== 7) // Protocol-Field-Compression
2550 aflags
|= SESSION_PFC
;
2551 else if (*p
== 8) // Address-and-Control-Field-Compression
2552 aflags
|= SESSION_ACFC
;
2557 case 28: // last recv lcp confreq
2559 case 26: // Initial Received LCP CONFREQ
2561 case 39: // seq required - we control it as an LNS anyway...
2563 case 36: // Random Vector
2564 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2565 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2566 if (n
> sizeof(session
[s
].random_vector
))
2567 n
= sizeof(session
[s
].random_vector
);
2568 memcpy(session
[s
].random_vector
, b
, n
);
2569 session
[s
].random_vector_length
= n
;
2571 case 46: // ppp disconnect cause
2574 uint16_t code
= ntohs(*(uint16_t *) b
);
2575 uint16_t proto
= ntohs(*(uint16_t *) (b
+ 2));
2576 uint8_t dir
= *(b
+ 4);
2578 LOG(4, s
, t
, " PPP disconnect cause "
2579 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2580 code
, proto
, dir
, n
- 5, b
+ 5);
2582 disc_cause_set
= mtype
;
2586 case 1: // admin disconnect
2587 disc_cause
= TERM_ADMIN_RESET
;
2588 disc_reason
= "Administrative disconnect";
2590 case 3: // lcp terminate
2591 if (dir
!= 2) break; // 1=peer (LNS), 2=local (LAC)
2592 disc_cause
= TERM_USER_REQUEST
;
2593 disc_reason
= "Normal disconnection";
2595 case 4: // compulsory encryption unavailable
2596 if (dir
!= 1) break; // 1=refused by peer, 2=local
2597 disc_cause
= TERM_USER_ERROR
;
2598 disc_reason
= "Compulsory encryption refused";
2600 case 5: // lcp: fsm timeout
2601 disc_cause
= TERM_PORT_ERROR
;
2602 disc_reason
= "LCP: FSM timeout";
2604 case 6: // lcp: no recognisable lcp packets received
2605 disc_cause
= TERM_PORT_ERROR
;
2606 disc_reason
= "LCP: no recognisable LCP packets";
2608 case 7: // lcp: magic-no error (possibly looped back)
2609 disc_cause
= TERM_PORT_ERROR
;
2610 disc_reason
= "LCP: magic-no error (possible loop)";
2612 case 8: // lcp: echo request timeout
2613 disc_cause
= TERM_PORT_ERROR
;
2614 disc_reason
= "LCP: echo request timeout";
2616 case 13: // auth: fsm timeout
2617 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2618 disc_reason
= "Authentication: FSM timeout";
2620 case 15: // auth: unacceptable auth protocol
2621 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2622 disc_reason
= "Unacceptable authentication protocol";
2624 case 16: // auth: authentication failed
2625 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2626 disc_reason
= "Authentication failed";
2628 case 17: // ncp: fsm timeout
2629 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2630 disc_reason
= "NCP: FSM timeout";
2632 case 18: // ncp: no ncps available
2633 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2634 disc_reason
= "NCP: no NCPs available";
2636 case 19: // ncp: failure to converge on acceptable address
2637 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2638 disc_reason
= (dir
== 1)
2639 ? "NCP: too many Configure-Naks received from peer"
2640 : "NCP: too many Configure-Naks sent to peer";
2642 case 20: // ncp: user not permitted to use any address
2643 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2644 disc_reason
= (dir
== 1)
2645 ? "NCP: local link address not acceptable to peer"
2646 : "NCP: remote link address not acceptable";
2653 static char e
[] = "unknown AVP 0xXXXX";
2654 LOG(2, s
, t
, " Unknown AVP type %u\n", mtype
);
2656 result
= 2; // general error
2657 error
= 8; // unknown mandatory AVP
2658 sprintf((msg
= e
) + 14, "%04x", mtype
);
2665 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2669 case 1: // SCCRQ - Start Control Connection Request
2670 tunnel
[t
].state
= TUNNELOPENING
;
2671 if (main_quit
!= QUIT_SHUTDOWN
)
2673 controlt
*c
= controlnew(2); // sending SCCRP
2674 control16(c
, 2, version
, 1); // protocol version
2675 control32(c
, 3, 3, 1); // framing
2676 controls(c
, 7, hostname
, 1); // host name
2677 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2678 control16(c
, 9, t
, 1); // assigned tunnel
2679 controladd(c
, 0, t
); // send the resply
2683 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2687 tunnel
[t
].state
= TUNNELOPEN
;
2688 tunnel
[t
].lastrec
= time_now
;
2691 tunnel
[t
].state
= TUNNELOPEN
;
2692 tunnel
[t
].lastrec
= time_now
;
2693 controlnull(t
); // ack
2696 controlnull(t
); // ack
2697 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2700 controlnull(t
); // simply ACK
2712 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2714 controlt
*c
= controlnew(11); // ICRP
2717 sessionfree
= session
[s
].next
;
2718 memset(&session
[s
], 0, sizeof(session
[s
]));
2720 if (s
> config
->cluster_highest_sessionid
)
2721 config
->cluster_highest_sessionid
= s
;
2723 session
[s
].opened
= time_now
;
2724 session
[s
].tunnel
= t
;
2725 session
[s
].far
= asession
;
2726 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
2727 LOG(3, s
, t
, "New session (%u/%u)\n", tunnel
[t
].far
, session
[s
].far
);
2728 control16(c
, 14, s
, 1); // assigned session
2729 controladd(c
, asession
, t
); // send the reply
2731 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2732 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2734 session
[s
].ppp
.phase
= Establish
;
2735 session
[s
].ppp
.lcp
= Starting
;
2737 STAT(session_created
);
2742 controlt
*c
= controlnew(14); // CDN
2745 STAT(session_overflow
);
2746 LOG(1, 0, t
, "No free sessions\n");
2747 control16(c
, 1, 4, 0); // temporary lack of resources
2750 control16(c
, 1, 2, 7); // shutting down, try another
2752 controladd(c
, asession
, t
); // send the message
2759 if (amagic
== 0) amagic
= time_now
;
2760 session
[s
].magic
= amagic
; // set magic number
2761 session
[s
].flags
= aflags
; // set flags received
2762 session
[s
].mru
= PPPoE_MRU
; // default
2763 controlnull(t
); // ack
2766 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
2767 sess_local
[s
].ppp_mru
= MRU
;
2769 // Set multilink options before sending initial LCP packet
2770 sess_local
[s
].mp_mrru
= 1614;
2771 sess_local
[s
].mp_epdis
= config
->bind_address
? config
->bind_address
: my_address
;
2774 change_state(s
, lcp
, RequestSent
);
2778 controlnull(t
); // ack
2779 sessionshutdown(s
, disc_reason
, CDN_NONE
, disc_cause
);
2782 LOG(1, s
, t
, "Missing message type\n");
2785 STAT(tunnel_rx_errors
);
2787 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2789 LOG(1, s
, t
, "Unknown message type %u\n", message
);
2792 if (chapresponse
) free(chapresponse
);
2793 cluster_send_tunnel(t
);
2797 LOG(4, s
, t
, " Got a ZLB ack\n");
2804 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2805 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2806 { // HDLC address header, discard
2812 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2813 STAT(tunnel_rx_errors
);
2823 proto
= ntohs(*(uint16_t *) p
);
2828 if (s
&& !session
[s
].opened
) // Is something wrong??
2830 if (!config
->cluster_iam_master
)
2832 // Pass it off to the master to deal with..
2833 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2838 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2839 STAT(tunnel_rx_errors
);
2843 if (proto
== PPPPAP
)
2845 session
[s
].last_packet
= time_now
;
2846 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2847 processpap(s
, t
, p
, l
);
2849 else if (proto
== PPPCHAP
)
2851 session
[s
].last_packet
= time_now
;
2852 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2853 processchap(s
, t
, p
, l
);
2855 else if (proto
== PPPLCP
)
2857 session
[s
].last_packet
= time_now
;
2858 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2859 processlcp(s
, t
, p
, l
);
2861 else if (proto
== PPPIPCP
)
2863 session
[s
].last_packet
= time_now
;
2864 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2865 processipcp(s
, t
, p
, l
);
2867 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
2869 session
[s
].last_packet
= time_now
;
2870 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2871 processipv6cp(s
, t
, p
, l
);
2873 else if (proto
== PPPCCP
)
2875 session
[s
].last_packet
= time_now
;
2876 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2877 processccp(s
, t
, p
, l
);
2879 else if (proto
== PPPIP
)
2883 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
2884 return; // closing session, PPP not processed
2887 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
2888 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2890 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2894 processipin(s
, t
, p
, l
);
2896 else if (proto
== PPPMP
)
2900 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
2901 return; // closing session, PPP not processed
2904 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
2905 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2907 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2911 processmpin(s
, t
, p
, l
);
2913 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
2917 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
2918 return; // closing session, PPP not processed
2921 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
2922 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2924 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2928 processipv6in(s
, t
, p
, l
);
2930 else if (session
[s
].ppp
.lcp
== Opened
)
2932 session
[s
].last_packet
= time_now
;
2933 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2934 protoreject(s
, t
, p
, l
, proto
);
2938 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
2939 proto
, ppp_state(session
[s
].ppp
.lcp
));
2944 // read and process packet on tun
2945 static void processtun(uint8_t * buf
, int len
)
2947 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2948 STAT(tun_rx_packets
);
2949 INC_STAT(tun_rx_bytes
, len
);
2957 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2958 STAT(tun_rx_errors
);
2962 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2963 processipout(buf
, len
);
2964 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2965 && config
->ipv6_prefix
.s6_addr
[0])
2966 processipv6out(buf
, len
);
2971 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2972 // that we look at the whole of the tunnel, radius and session tables
2974 static void regular_cleanups(double period
)
2976 // Next tunnel, radius and session to check for actions on.
2977 static tunnelidt t
= 0;
2979 static sessionidt s
= 0;
2992 // divide up tables into slices based on the last run
2993 t_slice
= config
->cluster_highest_tunnelid
* period
;
2994 r_slice
= (MAXRADIUS
- 1) * period
;
2995 s_slice
= config
->cluster_highest_sessionid
* period
;
2999 else if (t_slice
> config
->cluster_highest_tunnelid
)
3000 t_slice
= config
->cluster_highest_tunnelid
;
3004 else if (r_slice
> (MAXRADIUS
- 1))
3005 r_slice
= MAXRADIUS
- 1;
3009 else if (s_slice
> config
->cluster_highest_sessionid
)
3010 s_slice
= config
->cluster_highest_sessionid
;
3012 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
3014 for (i
= 0; i
< t_slice
; i
++)
3017 if (t
> config
->cluster_highest_tunnelid
)
3020 // check for expired tunnels
3021 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
3023 STAT(tunnel_timeout
);
3024 tunnelkill(t
, "Expired");
3028 // check for message resend
3029 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
3031 // resend pending messages as timeout on reply
3032 if (tunnel
[t
].retry
<= TIME
)
3034 controlt
*c
= tunnel
[t
].controls
;
3035 uint16_t w
= tunnel
[t
].window
;
3036 tunnel
[t
].try++; // another try
3037 if (tunnel
[t
].try > 5)
3038 tunnelkill(t
, "Timeout on control message"); // game over
3042 tunnelsend(c
->buf
, c
->length
, t
);
3050 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
3052 controlt
*c
= controlnew(6); // sending HELLO
3053 controladd(c
, 0, t
); // send the message
3054 LOG(3, 0, t
, "Sending HELLO message\n");
3058 // Check for tunnel changes requested from the CLI
3059 if ((a
= cli_tunnel_actions
[t
].action
))
3061 cli_tunnel_actions
[t
].action
= 0;
3062 if (a
& CLI_TUN_KILL
)
3064 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
3065 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
3071 for (i
= 0; i
< r_slice
; i
++)
3077 if (!radius
[r
].state
)
3080 if (radius
[r
].retry
<= TIME
)
3087 for (i
= 0; i
< s_slice
; i
++)
3090 if (s
> config
->cluster_highest_sessionid
)
3093 if (!session
[s
].opened
) // Session isn't in use
3096 // check for expired sessions
3099 if (session
[s
].die
<= TIME
)
3101 sessionkill(s
, "Expired");
3108 if (sess_local
[s
].lcp
.restart
<= time_now
)
3110 int next_state
= session
[s
].ppp
.lcp
;
3111 switch (session
[s
].ppp
.lcp
)
3115 next_state
= RequestSent
;
3118 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
3120 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
3121 sendlcp(s
, session
[s
].tunnel
);
3122 change_state(s
, lcp
, next_state
);
3126 sessionshutdown(s
, "No response to LCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3127 STAT(session_timeout
);
3137 if (sess_local
[s
].ipcp
.restart
<= time_now
)
3139 int next_state
= session
[s
].ppp
.ipcp
;
3140 switch (session
[s
].ppp
.ipcp
)
3144 next_state
= RequestSent
;
3147 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
3149 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
3150 sendipcp(s
, session
[s
].tunnel
);
3151 change_state(s
, ipcp
, next_state
);
3155 sessionshutdown(s
, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3156 STAT(session_timeout
);
3166 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
3168 int next_state
= session
[s
].ppp
.ipv6cp
;
3169 switch (session
[s
].ppp
.ipv6cp
)
3173 next_state
= RequestSent
;
3176 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
3178 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
3179 sendipv6cp(s
, session
[s
].tunnel
);
3180 change_state(s
, ipv6cp
, next_state
);
3184 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
3185 change_state(s
, ipv6cp
, Stopped
);
3192 if (sess_local
[s
].ccp
.restart
<= time_now
)
3194 int next_state
= session
[s
].ppp
.ccp
;
3195 switch (session
[s
].ppp
.ccp
)
3199 next_state
= RequestSent
;
3202 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
3204 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
3205 sendccp(s
, session
[s
].tunnel
);
3206 change_state(s
, ccp
, next_state
);
3210 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
3211 change_state(s
, ccp
, Stopped
);
3218 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
3219 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
3221 sessionshutdown(s
, "No response to LCP ECHO requests.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3222 STAT(session_timeout
);
3227 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3228 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
) &&
3229 (time_now
- sess_local
[s
].last_echo
>= ECHO_TIMEOUT
))
3231 uint8_t b
[MAXETHER
];
3233 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
, 1, 0, 0);
3237 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
3238 *(uint16_t *)(q
+ 2) = htons(8); // Length
3239 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
3241 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
3242 (int)(time_now
- session
[s
].last_packet
));
3243 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
3244 sess_local
[s
].last_echo
= time_now
;
3248 // Drop sessions who have reached session_timeout seconds
3249 if (session
[s
].session_timeout
)
3251 bundleidt bid
= session
[s
].bundle
;
3254 if (time_now
- bundle
[bid
].last_check
>= 1)
3256 bundle
[bid
].online_time
+= (time_now
- bundle
[bid
].last_check
) * bundle
[bid
].num_of_links
;
3257 bundle
[bid
].last_check
= time_now
;
3258 if (bundle
[bid
].online_time
>= session
[s
].session_timeout
)
3261 for (ses
= bundle
[bid
].num_of_links
- 1; ses
>= 0; ses
--)
3263 sessionshutdown(bundle
[bid
].members
[ses
], "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3270 else if (time_now
- session
[s
].opened
>= session
[s
].session_timeout
)
3272 sessionshutdown(s
, "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3278 // Drop sessions who have reached idle_timeout seconds
3279 if (session
[s
].last_data
&& session
[s
].idle_timeout
&& (time_now
- session
[s
].last_data
>= session
[s
].idle_timeout
))
3281 sessionshutdown(s
, "Idle Timeout Reached", CDN_ADMIN_DISC
, TERM_IDLE_TIMEOUT
);
3282 STAT(session_timeout
);
3287 // Check for actions requested from the CLI
3288 if ((a
= cli_session_actions
[s
].action
))
3292 cli_session_actions
[s
].action
= 0;
3293 if (a
& CLI_SESS_KILL
)
3295 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
3296 sessionshutdown(s
, "Requested by administrator.", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
3297 a
= 0; // dead, no need to check for other actions
3301 if (a
& CLI_SESS_NOSNOOP
)
3303 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
3304 session
[s
].snoop_ip
= 0;
3305 session
[s
].snoop_port
= 0;
3309 else if (a
& CLI_SESS_SNOOP
)
3311 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%u)\n",
3312 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
3313 cli_session_actions
[s
].snoop_port
);
3315 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
3316 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
3321 if (a
& CLI_SESS_NOTHROTTLE
)
3323 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
3324 throttle_session(s
, 0, 0);
3328 else if (a
& CLI_SESS_THROTTLE
)
3330 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3331 cli_session_actions
[s
].throttle_in
,
3332 cli_session_actions
[s
].throttle_out
);
3334 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3339 if (a
& CLI_SESS_NOFILTER
)
3341 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3342 filter_session(s
, 0, 0);
3346 else if (a
& CLI_SESS_FILTER
)
3348 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3349 cli_session_actions
[s
].filter_in
,
3350 cli_session_actions
[s
].filter_out
);
3352 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3358 cluster_send_session(s
);
3361 // RADIUS interim accounting
3362 if (config
->radius_accounting
&& config
->radius_interim
> 0
3363 && session
[s
].ip
&& !session
[s
].walled_garden
3364 && !sess_local
[s
].radius
// RADIUS already in progress
3365 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
3366 && session
[s
].flags
& SESSION_STARTED
)
3368 int rad
= radiusnew(s
);
3371 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3372 STAT(radius_overflow
);
3376 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3377 session
[s
].user
, session
[s
].unique_id
);
3379 radiussend(rad
, RADIUSINTERIM
);
3380 sess_local
[s
].last_interim
= time_now
;
3385 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3386 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3390 // Are we in the middle of a tunnel update, or radius
3393 static int still_busy(void)
3396 static clockt last_talked
= 0;
3397 static clockt start_busy_wait
= 0;
3400 static time_t stopped_bgp
= 0;
3405 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3407 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3408 if (bgp_peers
[i
].state
== Established
)
3409 bgp_stop(&bgp_peers
[i
]);
3411 stopped_bgp
= time_now
;
3413 if (!config
->cluster_iam_master
)
3415 // we don't want to become master
3416 cluster_send_ping(0);
3422 if (!config
->cluster_iam_master
&& time_now
< (stopped_bgp
+ QUIT_DELAY
))
3427 if (!config
->cluster_iam_master
)
3430 if (main_quit
== QUIT_SHUTDOWN
)
3432 static int dropped
= 0;
3437 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3438 for (i
= 1; i
< MAXTUNNEL
; i
++)
3439 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3440 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3446 if (start_busy_wait
== 0)
3447 start_busy_wait
= TIME
;
3449 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3451 if (!tunnel
[i
].controlc
)
3454 if (last_talked
!= TIME
)
3456 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i
);
3462 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3463 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3465 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3469 for (i
= 1; i
< MAXRADIUS
; i
++)
3471 if (radius
[i
].state
== RADIUSNULL
)
3473 if (radius
[i
].state
== RADIUSWAIT
)
3476 if (last_talked
!= TIME
)
3478 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i
, radius
[i
].session
);
3488 # include <sys/epoll.h>
3490 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3491 # include "fake_epoll.h"
3494 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3497 // additional polled fds
3499 # define EXTRA_FDS BGP_NUM_PEERS
3501 # define EXTRA_FDS 0
3504 // main loop - gets packets on tun or udp and processes them
3505 static void mainloop(void)
3509 clockt next_cluster_ping
= 0; // send initial ping immediately
3510 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3511 int maxevent
= sizeof(events
)/sizeof(*events
);
3513 if ((epollfd
= epoll_create(maxevent
)) < 0)
3515 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3519 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3520 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3522 /* setup our fds to poll for input */
3524 static struct event_data d
[BASE_FDS
];
3525 struct epoll_event e
;
3532 d
[i
].type
= FD_TYPE_CLI
;
3533 e
.data
.ptr
= &d
[i
++];
3534 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3537 d
[i
].type
= FD_TYPE_CLUSTER
;
3538 e
.data
.ptr
= &d
[i
++];
3539 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3541 d
[i
].type
= FD_TYPE_TUN
;
3542 e
.data
.ptr
= &d
[i
++];
3543 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3545 d
[i
].type
= FD_TYPE_UDP
;
3546 e
.data
.ptr
= &d
[i
++];
3547 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3549 d
[i
].type
= FD_TYPE_CONTROL
;
3550 e
.data
.ptr
= &d
[i
++];
3551 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3553 d
[i
].type
= FD_TYPE_DAE
;
3554 e
.data
.ptr
= &d
[i
++];
3555 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3559 signal(SIGPIPE
, SIG_IGN
);
3560 bgp_setup(config
->as_number
);
3561 if (config
->bind_address
)
3562 bgp_add_route(config
->bind_address
, 0xffffffff);
3564 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3566 if (config
->neighbour
[i
].name
[0])
3567 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3568 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3569 config
->neighbour
[i
].hold
, config
->neighbour
[i
].update_source
,
3570 0); /* 0 = routing disabled */
3574 while (!main_quit
|| still_busy())
3584 config
->reload_config
++;
3587 if (config
->reload_config
)
3589 config
->reload_config
= 0;
3597 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3598 STAT(select_called
);
3603 if (errno
== EINTR
||
3604 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3607 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3613 struct sockaddr_in addr
;
3614 struct in_addr local
;
3619 int cluster_ready
= 0;
3622 int cluster_pkts
= 0;
3624 uint32_t bgp_events
[BGP_NUM_PEERS
];
3625 memset(bgp_events
, 0, sizeof(bgp_events
));
3628 for (c
= n
, i
= 0; i
< c
; i
++)
3630 struct event_data
*d
= events
[i
].data
.ptr
;
3634 case FD_TYPE_CLI
: // CLI connections
3638 alen
= sizeof(addr
);
3639 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3645 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3651 // these are handled below, with multiple interleaved reads
3652 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3653 case FD_TYPE_TUN
: tun_ready
++; break;
3654 case FD_TYPE_UDP
: udp_ready
++; break;
3656 case FD_TYPE_CONTROL
: // nsctl commands
3657 alen
= sizeof(addr
);
3658 s
= recvfromto(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
3659 if (s
> 0) processcontrol(buf
, s
, &addr
, alen
, &local
);
3663 case FD_TYPE_DAE
: // DAE requests
3664 alen
= sizeof(addr
);
3665 s
= recvfromto(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
3666 if (s
> 0) processdae(buf
, s
, &addr
, alen
, &local
);
3670 case FD_TYPE_RADIUS
: // RADIUS response
3671 alen
= sizeof(addr
);
3672 s
= recvfrom(radfds
[d
->index
], buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
3673 if (s
>= 0 && config
->cluster_iam_master
)
3675 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
3676 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
3677 processrad(buf
, s
, d
->index
);
3679 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3680 fmtaddr(addr
.sin_addr
.s_addr
, 0));
3688 bgp_events
[d
->index
] = events
[i
].events
;
3694 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3699 bgp_process(bgp_events
);
3702 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3707 alen
= sizeof(addr
);
3708 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3710 processudp(buf
, s
, &addr
);
3723 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3738 alen
= sizeof(addr
);
3739 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3741 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3752 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3753 STAT(multi_read_used
);
3755 if (c
>= config
->multi_read_count
)
3757 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3758 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3760 STAT(multi_read_exceeded
);
3767 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
3769 // Log current traffic stats
3770 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3771 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3772 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
3773 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
3774 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
3776 udp_tx
= udp_rx
= 0;
3777 udp_rx_pkt
= eth_rx_pkt
= 0;
3778 eth_tx
= eth_rx
= 0;
3781 if (config
->dump_speed
)
3782 printf("%s\n", config
->bandwidth
);
3784 // Update the internal time counter
3785 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3789 struct param_timer p
= { time_now
};
3790 run_plugins(PLUGIN_TIMER
, &p
);
3794 // Runs on every machine (master and slaves).
3795 if (next_cluster_ping
<= TIME
)
3797 // Check to see which of the cluster is still alive..
3799 cluster_send_ping(basetime
); // Only does anything if we're a slave
3800 cluster_check_master(); // ditto.
3802 cluster_heartbeat(); // Only does anything if we're a master.
3803 cluster_check_slaves(); // ditto.
3805 master_update_counts(); // If we're a slave, send our byte counters to our master.
3807 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3808 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3810 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3813 if (!config
->cluster_iam_master
)
3816 // Run token bucket filtering queue..
3817 // Only run it every 1/10th of a second.
3819 static clockt last_run
= 0;
3820 if (last_run
!= TIME
)
3827 // Handle timeouts, retries etc.
3829 static double last_clean
= 0;
3833 TIME
= now(&this_clean
);
3834 diff
= this_clean
- last_clean
;
3836 // Run during idle time (after we've handled
3837 // all incoming packets) or every 1/10th sec
3838 if (!more
|| diff
> 0.1)
3840 regular_cleanups(diff
);
3841 last_clean
= this_clean
;
3845 if (*config
->accounting_dir
)
3847 static clockt next_acct
= 0;
3848 static clockt next_shut_acct
= 0;
3850 if (next_acct
<= TIME
)
3852 // Dump accounting data
3853 next_acct
= TIME
+ ACCT_TIME
;
3854 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3857 else if (next_shut_acct
<= TIME
)
3859 // Dump accounting data for shutdown sessions
3860 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3867 // Are we the master and shutting down??
3868 if (config
->cluster_iam_master
)
3869 cluster_heartbeat(); // Flush any queued changes..
3871 // Ok. Notify everyone we're shutting down. If we're
3872 // the master, this will force an election.
3873 cluster_send_ping(0);
3876 // Important!!! We MUST not process any packets past this point!
3877 LOG(1, 0, 0, "Shutdown complete\n");
3880 static void stripdomain(char *host
)
3884 if ((p
= strchr(host
, '.')))
3890 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3896 while (fgets(buf
, sizeof(buf
), resolv
))
3898 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3901 if (!isspace(buf
[6]))
3905 while (isspace(*b
)) b
++;
3910 while (*b
&& !isspace(*b
)) b
++;
3912 if (buf
[0] == 'd') // domain is canonical
3918 // first search line
3921 // hold, may be subsequent domain line
3922 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3933 int hl
= strlen(host
);
3934 int dl
= strlen(domain
);
3935 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3936 host
[hl
-dl
- 1] = 0;
3940 *p
= 0; // everything after first dot
3945 // Init data structures
3946 static void initdata(int optdebug
, char *optconfig
)
3950 if (!(config
= shared_malloc(sizeof(configt
))))
3952 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3956 memset(config
, 0, sizeof(configt
));
3957 time(&config
->start_time
);
3958 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3959 config
->debug
= optdebug
;
3960 config
->num_tbfs
= MAXTBFS
;
3961 config
->rl_rate
= 28; // 28kbps
3962 config
->cluster_mcast_ttl
= 1;
3963 config
->cluster_master_min_adv
= 1;
3964 config
->ppp_restart_time
= 3;
3965 config
->ppp_max_configure
= 10;
3966 config
->ppp_max_failure
= 5;
3967 config
->kill_timedout_sessions
= 1;
3968 strcpy(config
->random_device
, RANDOMDEVICE
);
3970 log_stream
= stderr
;
3973 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3975 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3978 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3981 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3983 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3986 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3988 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3991 if (!(bundle
= shared_malloc(sizeof(bundlet
) * MAXBUNDLE
)))
3993 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno
));
3996 if (!(frag
= shared_malloc(sizeof(fragmentationt
) * MAXBUNDLE
)))
3998 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno
));
4001 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
4003 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
4007 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
4009 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
4013 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
4015 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
4019 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
4021 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
4025 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
4027 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
4030 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
4032 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
4034 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
4037 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
4039 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
4041 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
4044 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
4046 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
4047 memset(bundle
, 0, sizeof(bundlet
) * MAXBUNDLE
);
4048 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
4049 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
4050 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
4052 // Put all the sessions on the free list marked as undefined.
4053 for (i
= 1; i
< MAXSESSION
; i
++)
4055 session
[i
].next
= i
+ 1;
4056 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
4058 session
[MAXSESSION
- 1].next
= 0;
4061 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4062 for (i
= 1; i
< MAXTUNNEL
; i
++)
4063 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
4065 for (i
= 1; i
< MAXBUNDLE
; i
++) {
4066 bundle
[i
].state
= BUNDLEUNDEF
;
4071 // Grab my hostname unless it's been specified
4072 gethostname(hostname
, sizeof(hostname
));
4073 stripdomain(hostname
);
4076 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
4079 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
4081 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
4087 static int assign_ip_address(sessionidt s
)
4091 time_t best_time
= time_now
;
4092 char *u
= session
[s
].user
;
4096 CSTAT(assign_ip_address
);
4098 for (i
= 1; i
< ip_pool_size
; i
++)
4100 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
4103 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
4110 if (ip_address_pool
[i
].last
< best_time
)
4113 if (!(best_time
= ip_address_pool
[i
].last
))
4114 break; // never used, grab this one
4120 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
4124 session
[s
].ip
= ip_address_pool
[best
].address
;
4125 session
[s
].ip_pool_index
= best
;
4126 ip_address_pool
[best
].assigned
= 1;
4127 ip_address_pool
[best
].last
= time_now
;
4128 ip_address_pool
[best
].session
= s
;
4129 if (session
[s
].walled_garden
)
4130 /* Don't track addresses of users in walled garden (note: this
4131 means that their address isn't "sticky" even if they get
4133 ip_address_pool
[best
].user
[0] = 0;
4135 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
4138 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
4139 reuse
? "Reusing" : "Allocating", best
);
4144 static void free_ip_address(sessionidt s
)
4146 int i
= session
[s
].ip_pool_index
;
4149 CSTAT(free_ip_address
);
4152 return; // what the?
4154 if (i
< 0) // Is this actually part of the ip pool?
4158 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
4160 ip_address_pool
[i
].assigned
= 0;
4161 ip_address_pool
[i
].session
= 0;
4162 ip_address_pool
[i
].last
= time_now
;
4166 // Fsck the address pool against the session table.
4167 // Normally only called when we become a master.
4169 // This isn't perfect: We aren't keep tracking of which
4170 // users used to have an IP address.
4172 void rebuild_address_pool(void)
4177 // Zero the IP pool allocation, and build
4178 // a map from IP address to pool index.
4179 for (i
= 1; i
< MAXIPPOOL
; ++i
)
4181 ip_address_pool
[i
].assigned
= 0;
4182 ip_address_pool
[i
].session
= 0;
4183 if (!ip_address_pool
[i
].address
)
4186 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
4189 for (i
= 0; i
< MAXSESSION
; ++i
)
4192 if (!(session
[i
].opened
&& session
[i
].ip
))
4195 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
4197 if (session
[i
].ip_pool_index
< 0)
4199 // Not allocated out of the pool.
4200 if (ipid
< 1) // Not found in the pool either? good.
4203 LOG(0, i
, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4204 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
4206 // Fall through and process it as part of the pool.
4210 if (ipid
> MAXIPPOOL
|| ipid
< 0)
4212 LOG(0, i
, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
4214 session
[i
].ip_pool_index
= ipid
;
4218 ip_address_pool
[ipid
].assigned
= 1;
4219 ip_address_pool
[ipid
].session
= i
;
4220 ip_address_pool
[ipid
].last
= time_now
;
4221 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4222 session
[i
].ip_pool_index
= ipid
;
4223 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
4228 // Fix the address pool to match a changed session.
4229 // (usually when the master sends us an update).
4230 static void fix_address_pool(int sid
)
4234 ipid
= session
[sid
].ip_pool_index
;
4236 if (ipid
> ip_pool_size
)
4237 return; // Ignore it. rebuild_address_pool will fix it up.
4239 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
4240 return; // Just ignore it. rebuild_address_pool will take care of it.
4242 ip_address_pool
[ipid
].assigned
= 1;
4243 ip_address_pool
[ipid
].session
= sid
;
4244 ip_address_pool
[ipid
].last
= time_now
;
4245 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4249 // Add a block of addresses to the IP pool to hand out.
4251 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
4255 mask
= 0xffffffff; // Host route only.
4259 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
4262 for (i
= addr
;(i
& mask
) == addr
; ++i
)
4264 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
4265 continue; // Skip 0 and broadcast addresses.
4267 ip_address_pool
[ip_pool_size
].address
= i
;
4268 ip_address_pool
[ip_pool_size
].assigned
= 0;
4270 if (ip_pool_size
>= MAXIPPOOL
)
4272 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
4278 // Initialize the IP address pool
4279 static void initippool()
4284 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
4286 if (!(f
= fopen(IPPOOLFILE
, "r")))
4288 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
4292 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
4295 buf
[4095] = 0; // Force it to be zero terminated/
4297 if (*buf
== '#' || *buf
== '\n')
4298 continue; // Skip comments / blank lines
4299 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
4300 if ((p
= (char *)strchr(buf
, ':')))
4304 src
= inet_addr(buf
);
4305 if (src
== INADDR_NONE
)
4307 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
4310 // This entry is for a specific IP only
4311 if (src
!= config
->bind_address
)
4316 if ((p
= (char *)strchr(pool
, '/')))
4320 in_addr_t start
= 0, mask
= 0;
4322 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
4324 if (!*p
|| !(numbits
= atoi(p
)))
4326 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
4329 start
= ntohl(inet_addr(pool
));
4330 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
4332 // Add a static route for this pool
4333 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
4334 fmtaddr(htonl(start
), 0), 32 + mask
);
4336 routeset(0, start
, mask
, 0, 1);
4338 add_to_ip_pool(start
, mask
);
4342 // It's a single ip address
4343 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
4347 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
4350 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
4352 struct sockaddr_in snoop_addr
= {0};
4353 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
4356 snoop_addr
.sin_family
= AF_INET
;
4357 snoop_addr
.sin_addr
.s_addr
= destination
;
4358 snoop_addr
.sin_port
= ntohs(port
);
4360 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size
,
4361 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
4362 htons(snoop_addr
.sin_port
));
4364 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
4365 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
4367 STAT(packets_snooped
);
4370 static int dump_session(FILE **f
, sessiont
*s
)
4372 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4377 char filename
[1024];
4379 time_t now
= time(NULL
);
4381 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4382 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4384 if (!(*f
= fopen(filename
, "w")))
4386 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
4390 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
4391 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
4396 "# format: username ip qos uptxoctets downrxoctets\n",
4398 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
4403 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
4404 fprintf(*f
, "%s %s %d %u %u\n",
4405 s
->user
, // username
4406 fmtaddr(htonl(s
->ip
), 0), // ip
4407 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
4408 (uint32_t) s
->cin_delta
, // uptxoctets
4409 (uint32_t) s
->cout_delta
); // downrxoctets
4411 s
->cin_delta
= s
->cout_delta
= 0;
4416 static void dump_acct_info(int all
)
4422 CSTAT(dump_acct_info
);
4426 for (i
= 0; i
< shut_acct_n
; i
++)
4427 dump_session(&f
, &shut_acct
[i
]);
4433 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4434 dump_session(&f
, &session
[i
]);
4441 int main(int argc
, char *argv
[])
4445 char *optconfig
= CONFIGFILE
;
4447 time(&basetime
); // start clock
4450 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
4455 if (fork()) exit(0);
4457 freopen("/dev/null", "r", stdin
);
4458 freopen("/dev/null", "w", stdout
);
4459 freopen("/dev/null", "w", stderr
);
4468 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
4471 printf("Args are:\n"
4472 "\t-d\t\tDetach from terminal\n"
4473 "\t-c <file>\tConfig file\n"
4474 "\t-h <hostname>\tForce hostname\n"
4482 // Start the timer routine off
4484 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4487 initdata(optdebug
, optconfig
);
4492 init_tbf(config
->num_tbfs
);
4494 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
4495 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4496 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4499 rlim
.rlim_cur
= RLIM_INFINITY
;
4500 rlim
.rlim_max
= RLIM_INFINITY
;
4501 // Remove the maximum core size
4502 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
4503 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
4505 // Make core dumps go to /tmp
4509 if (config
->scheduler_fifo
)
4512 struct sched_param params
= {0};
4513 params
.sched_priority
= 1;
4515 if (get_nprocs() < 2)
4517 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4518 config
->scheduler_fifo
= 0;
4522 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4524 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4528 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4529 config
->scheduler_fifo
= 0;
4534 /* Set up the cluster communications port. */
4535 if (cluster_init() < 0)
4539 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4547 unsigned seed
= time_now
^ getpid();
4548 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4552 signal(SIGHUP
, sighup_handler
);
4553 signal(SIGCHLD
, sigchild_handler
);
4554 signal(SIGTERM
, shutdown_handler
);
4555 signal(SIGINT
, shutdown_handler
);
4556 signal(SIGQUIT
, shutdown_handler
);
4558 // Prevent us from getting paged out
4559 if (config
->lock_pages
)
4561 if (!mlockall(MCL_CURRENT
))
4562 LOG(1, 0, 0, "Locking pages into memory\n");
4564 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4569 /* remove plugins (so cleanup code gets run) */
4572 // Remove the PID file if we wrote it
4573 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4574 unlink(config
->pid_file
);
4576 /* kill CLI children */
4577 signal(SIGTERM
, SIG_IGN
);
4582 static void sighup_handler(int sig
)
4587 static void shutdown_handler(int sig
)
4589 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4592 static void sigchild_handler(int sig
)
4594 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4598 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4601 *challenge_response
= NULL
;
4603 if (!*config
->l2tp_secret
)
4605 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4609 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4611 *challenge_response
= calloc(17, 1);
4614 MD5_Update(&ctx
, &id
, 1);
4615 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
4616 MD5_Update(&ctx
, challenge
, challenge_length
);
4617 MD5_Final(*challenge_response
, &ctx
);
4622 static int facility_value(char *name
)
4625 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4627 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4628 return facilitynames
[i
].c_val
;
4633 static void update_config()
4637 static int timeout
= 0;
4638 static int interval
= 0;
4645 if (log_stream
!= stderr
)
4651 if (*config
->log_filename
)
4653 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4655 char *p
= config
->log_filename
+ 7;
4658 openlog("l2tpns", LOG_PID
, facility_value(p
));
4662 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4664 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4666 fseek(log_stream
, 0, SEEK_END
);
4667 setbuf(log_stream
, NULL
);
4671 log_stream
= stderr
;
4672 setbuf(log_stream
, NULL
);
4678 log_stream
= stderr
;
4679 setbuf(log_stream
, NULL
);
4682 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4683 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4685 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
4686 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
4687 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
4689 // reset MRU/MSS globals
4690 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
4691 if (MRU
> PPPoE_MRU
)
4694 MSS
= MRU
- TCP_HDRS
;
4697 config
->numradiusservers
= 0;
4698 for (i
= 0; i
< MAXRADSERVER
; i
++)
4699 if (config
->radiusserver
[i
])
4701 config
->numradiusservers
++;
4702 // Set radius port: if not set, take the port from the
4703 // first radius server. For the first radius server,
4704 // take the #defined default value from l2tpns.h
4706 // test twice, In case someone works with
4707 // a secondary radius server without defining
4708 // a primary one, this will work even then.
4709 if (i
> 0 && !config
->radiusport
[i
])
4710 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4711 if (!config
->radiusport
[i
])
4712 config
->radiusport
[i
] = RADPORT
;
4715 if (!config
->numradiusservers
)
4716 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4718 // parse radius_authtypes_s
4719 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4720 p
= config
->radius_authtypes_s
;
4723 char *s
= strpbrk(p
, " \t,");
4729 while (*s
== ' ' || *s
== '\t')
4736 if (!strncasecmp("chap", p
, strlen(p
)))
4738 else if (!strncasecmp("pap", p
, strlen(p
)))
4741 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4743 config
->radius_authtypes
|= type
;
4744 if (!config
->radius_authprefer
)
4745 config
->radius_authprefer
= type
;
4750 if (!config
->radius_authtypes
)
4752 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4753 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4756 // normalise radius_authtypes_s
4757 if (config
->radius_authprefer
== AUTHPAP
)
4759 strcpy(config
->radius_authtypes_s
, "pap");
4760 if (config
->radius_authtypes
& AUTHCHAP
)
4761 strcat(config
->radius_authtypes_s
, ", chap");
4765 strcpy(config
->radius_authtypes_s
, "chap");
4766 if (config
->radius_authtypes
& AUTHPAP
)
4767 strcat(config
->radius_authtypes_s
, ", pap");
4770 if (!config
->radius_dae_port
)
4771 config
->radius_dae_port
= DAEPORT
;
4773 // re-initialise the random number source
4774 initrandom(config
->random_device
);
4777 for (i
= 0; i
< MAXPLUGINS
; i
++)
4779 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4782 if (*config
->plugins
[i
])
4785 add_plugin(config
->plugins
[i
]);
4787 else if (*config
->old_plugins
[i
])
4790 remove_plugin(config
->old_plugins
[i
]);
4795 guest_accounts_num
= 0;
4796 char *p2
= config
->guest_user
;
4799 char *s
= strpbrk(p2
, " \t,");
4803 while (*s
== ' ' || *s
== '\t')
4810 strcpy(guest_users
[guest_accounts_num
], p2
);
4811 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num
, guest_users
[guest_accounts_num
]);
4812 guest_accounts_num
++;
4815 // Rebuild the guest_user array
4816 strcpy(config
->guest_user
, "");
4818 for (ui
=0; ui
<guest_accounts_num
; ui
++)
4820 strcat(config
->guest_user
, guest_users
[ui
]);
4821 if (ui
<guest_accounts_num
-1)
4823 strcat(config
->guest_user
, ",");
4828 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4829 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4830 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4831 if (!*config
->cluster_interface
)
4832 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4834 if (!config
->cluster_hb_interval
)
4835 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4837 if (!config
->cluster_hb_timeout
)
4838 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4840 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4842 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4843 // late, ensure we're sufficiently larger than that
4844 int t
= 4 * config
->cluster_hb_interval
+ 11;
4846 if (config
->cluster_hb_timeout
< t
)
4848 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4849 config
->cluster_hb_timeout
= t
;
4852 // Push timing changes to the slaves immediately if we're the master
4853 if (config
->cluster_iam_master
)
4854 cluster_heartbeat();
4856 interval
= config
->cluster_hb_interval
;
4857 timeout
= config
->cluster_hb_timeout
;
4861 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4864 if ((f
= fopen(config
->pid_file
, "w")))
4866 fprintf(f
, "%d\n", getpid());
4868 config
->wrote_pid
= 1;
4872 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4877 static void read_config_file()
4881 if (!config
->config_file
) return;
4882 if (!(f
= fopen(config
->config_file
, "r")))
4884 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4888 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4890 LOG(3, 0, 0, "Done reading config file\n");
4894 int sessionsetup(sessionidt s
, tunnelidt t
)
4896 // A session now exists, set it up
4902 CSTAT(sessionsetup
);
4904 LOG(3, s
, t
, "Doing session setup for session\n");
4906 // Join a bundle if the MRRU option is accepted
4907 if(session
[s
].mrru
> 0 && session
[s
].bundle
== 0)
4909 LOG(3, s
, t
, "This session can be part of multilink bundle\n");
4910 if (join_bundle(s
) > 0)
4911 cluster_send_bundle(session
[s
].bundle
);
4914 LOG(0, s
, t
, "MPPP: Mismaching mssf option with other sessions in bundle\n");
4915 sessionshutdown(s
, "Mismaching mssf option.", CDN_NONE
, TERM_SERVICE_UNAVAILABLE
);
4922 assign_ip_address(s
);
4925 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4926 sessionshutdown(s
, "No IP addresses available.", CDN_TRY_ANOTHER
, TERM_SERVICE_UNAVAILABLE
);
4929 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4930 fmtaddr(htonl(session
[s
].ip
), 0));
4934 // Make sure this is right
4935 session
[s
].tunnel
= t
;
4937 // zap old sessions with same IP and/or username
4938 // Don't kill gardened sessions - doing so leads to a DoS
4939 // from someone who doesn't need to know the password
4942 user
= session
[s
].user
;
4943 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4945 if (i
== s
) continue;
4946 if (!session
[s
].opened
) continue;
4947 // Allow duplicate sessions for multilink ones of the same bundle.
4948 if (session
[s
].bundle
&& session
[i
].bundle
&& session
[s
].bundle
== session
[i
].bundle
)
4950 if (ip
== session
[i
].ip
)
4952 sessionkill(i
, "Duplicate IP address");
4956 if (config
->allow_duplicate_users
) continue;
4957 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4961 for (gu
= 0; gu
< guest_accounts_num
; gu
++)
4963 if (!strcasecmp(user
, guest_users
[gu
]))
4969 if (found
) continue;
4971 // Drop the new session in case of duplicate sessionss, not the old one.
4972 if (!strcasecmp(user
, session
[i
].user
))
4973 sessionkill(i
, "Duplicate session for users");
4977 // no need to set a route for the same IP address of the bundle
4978 if (!session
[s
].bundle
|| (bundle
[session
[s
].bundle
].num_of_links
== 1))
4982 // Add the route for this session.
4983 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4985 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4986 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4989 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4992 // Static IPs need to be routed if not already
4993 // convered by a Framed-Route. Anything else is part
4994 // of the IP address pool and is already routed, it
4995 // just needs to be added to the IP cache.
4996 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4997 if (session
[s
].ip_pool_index
== -1) // static ip
4999 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
5002 cache_ipmap(session
[s
].ip
, s
);
5005 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
5006 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
5008 // Run the plugin's against this new session.
5010 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
5011 run_plugins(PLUGIN_NEW_SESSION
, &data
);
5014 // Allocate TBFs if throttled
5015 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
5016 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
5018 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
5020 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
5021 fmtaddr(htonl(session
[s
].ip
), 0),
5022 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
5024 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
5026 return 1; // RADIUS OK and IP allocated, done...
5030 // This session just got dropped on us by the master or something.
5031 // Make sure our tables up up to date...
5033 int load_session(sessionidt s
, sessiont
*new)
5039 if (new->ip_pool_index
>= MAXIPPOOL
||
5040 new->tunnel
>= MAXTUNNEL
)
5042 LOG(0, s
, 0, "Strange session update received!\n");
5043 // FIXME! What to do here?
5048 // Ok. All sanity checks passed. Now we're committed to
5049 // loading the new session.
5052 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
5054 // See if routes/ip cache need updating
5055 if (new->ip
!= session
[s
].ip
)
5058 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
5059 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
5060 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
5068 // remove old routes...
5069 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
5071 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
5072 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
5075 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
5081 if (session
[s
].ip_pool_index
== -1) // static IP
5083 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
5085 else // It's part of the IP pool, remove it manually.
5086 uncache_ipmap(session
[s
].ip
);
5091 // add new routes...
5092 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
5094 if ((new->ip
& new->route
[i
].mask
) ==
5095 (new->route
[i
].ip
& new->route
[i
].mask
))
5098 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
5104 // If there's a new one, add it.
5105 if (new->ip_pool_index
== -1)
5107 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
5110 cache_ipmap(new->ip
, s
);
5115 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5116 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
5119 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
5121 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %u\n", (int) new->filter_in
);
5125 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
5127 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %u\n", (int) new->filter_out
);
5128 new->filter_out
= 0;
5131 if (new->filter_in
!= session
[s
].filter_in
)
5133 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
5134 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
5137 if (new->filter_out
!= session
[s
].filter_out
)
5139 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
5140 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
5143 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
5144 // for walking the sessions to forward byte counts to the master.
5145 config
->cluster_highest_sessionid
= s
;
5147 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
5149 // Do fixups into address pool.
5150 if (new->ip_pool_index
!= -1)
5151 fix_address_pool(s
);
5156 static void initplugins()
5160 loaded_plugins
= ll_init();
5161 // Initialize the plugins to nothing
5162 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
5163 plugins
[i
] = ll_init();
5166 static void *open_plugin(char *plugin_name
, int load
)
5168 char path
[256] = "";
5170 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
5171 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
5172 return dlopen(path
, RTLD_NOW
);
5175 // plugin callback to get a config value
5176 static void *getconfig(char *key
, enum config_typet type
)
5180 for (i
= 0; config_values
[i
].key
; i
++)
5182 if (!strcmp(config_values
[i
].key
, key
))
5184 if (config_values
[i
].type
== type
)
5185 return ((void *) config
) + config_values
[i
].offset
;
5187 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5188 key
, type
, config_values
[i
].type
);
5194 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
5198 static int add_plugin(char *plugin_name
)
5200 static struct pluginfuncs funcs
= {
5205 sessiontbysessionidt
,
5206 sessionidtbysessiont
,
5213 cluster_send_session
,
5216 void *p
= open_plugin(plugin_name
, 1);
5217 int (*initfunc
)(struct pluginfuncs
*);
5222 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5226 if (ll_contains(loaded_plugins
, p
))
5229 return 0; // already loaded
5233 int *v
= dlsym(p
, "plugin_api_version");
5234 if (!v
|| *v
!= PLUGIN_API_VERSION
)
5236 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5242 if ((initfunc
= dlsym(p
, "plugin_init")))
5244 if (!initfunc(&funcs
))
5246 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5252 ll_push(loaded_plugins
, p
);
5254 for (i
= 0; i
< max_plugin_functions
; i
++)
5257 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5259 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
5260 ll_push(plugins
[i
], x
);
5264 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
5268 static void run_plugin_done(void *plugin
)
5270 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
5276 static int remove_plugin(char *plugin_name
)
5278 void *p
= open_plugin(plugin_name
, 0);
5284 if (ll_contains(loaded_plugins
, p
))
5287 for (i
= 0; i
< max_plugin_functions
; i
++)
5290 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5291 ll_delete(plugins
[i
], x
);
5294 ll_delete(loaded_plugins
, p
);
5300 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
5304 int run_plugins(int plugin_type
, void *data
)
5306 int (*func
)(void *data
);
5308 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
5309 return PLUGIN_RET_ERROR
;
5311 ll_reset(plugins
[plugin_type
]);
5312 while ((func
= ll_next(plugins
[plugin_type
])))
5316 if (r
!= PLUGIN_RET_OK
)
5317 return r
; // stop here
5320 return PLUGIN_RET_OK
;
5323 static void plugins_done()
5327 ll_reset(loaded_plugins
);
5328 while ((p
= ll_next(loaded_plugins
)))
5332 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
5334 struct nsctl request
;
5335 struct nsctl response
;
5336 int type
= unpack_control(&request
, buf
, len
);
5340 if (log_stream
&& config
->debug
>= 4)
5344 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5345 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
5349 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5350 dump_control(&request
, log_stream
);
5356 case NSCTL_REQ_LOAD
:
5357 if (request
.argc
!= 1)
5359 response
.type
= NSCTL_RES_ERR
;
5361 response
.argv
[0] = "name of plugin required";
5363 else if ((r
= add_plugin(request
.argv
[0])) < 1)
5365 response
.type
= NSCTL_RES_ERR
;
5367 response
.argv
[0] = !r
5368 ? "plugin already loaded"
5369 : "error loading plugin";
5373 response
.type
= NSCTL_RES_OK
;
5379 case NSCTL_REQ_UNLOAD
:
5380 if (request
.argc
!= 1)
5382 response
.type
= NSCTL_RES_ERR
;
5384 response
.argv
[0] = "name of plugin required";
5386 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
5388 response
.type
= NSCTL_RES_ERR
;
5390 response
.argv
[0] = !r
5391 ? "plugin not loaded"
5392 : "plugin not found";
5396 response
.type
= NSCTL_RES_OK
;
5402 case NSCTL_REQ_HELP
:
5403 response
.type
= NSCTL_RES_OK
;
5406 ll_reset(loaded_plugins
);
5407 while ((p
= ll_next(loaded_plugins
)))
5409 char **help
= dlsym(p
, "plugin_control_help");
5410 while (response
.argc
< 0xff && help
&& *help
)
5411 response
.argv
[response
.argc
++] = *help
++;
5416 case NSCTL_REQ_CONTROL
:
5418 struct param_control param
= {
5419 config
->cluster_iam_master
,
5426 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
5428 if (r
== PLUGIN_RET_ERROR
)
5430 response
.type
= NSCTL_RES_ERR
;
5432 response
.argv
[0] = param
.additional
5434 : "error returned by plugin";
5436 else if (r
== PLUGIN_RET_NOTMASTER
)
5438 static char msg
[] = "must be run on master: 000.000.000.000";
5440 response
.type
= NSCTL_RES_ERR
;
5442 if (config
->cluster_master_address
)
5444 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
5445 response
.argv
[0] = msg
;
5449 response
.argv
[0] = "must be run on master: none elected";
5452 else if (!(param
.response
& NSCTL_RESPONSE
))
5454 response
.type
= NSCTL_RES_ERR
;
5456 response
.argv
[0] = param
.response
5457 ? "unrecognised response value from plugin"
5458 : "unhandled action";
5462 response
.type
= param
.response
;
5464 if (param
.additional
)
5467 response
.argv
[0] = param
.additional
;
5475 response
.type
= NSCTL_RES_ERR
;
5477 response
.argv
[0] = "error unpacking control packet";
5480 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
5483 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5487 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
5490 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
5491 if (log_stream
&& config
->debug
>= 4)
5493 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5494 dump_control(&response
, log_stream
);
5498 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5499 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
5504 static tunnelidt
new_tunnel()
5507 for (i
= 1; i
< MAXTUNNEL
; i
++)
5509 if (tunnel
[i
].state
== TUNNELFREE
)
5511 LOG(4, 0, i
, "Assigning tunnel ID %u\n", i
);
5512 if (i
> config
->cluster_highest_tunnelid
)
5513 config
->cluster_highest_tunnelid
= i
;
5517 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5522 // We're becoming the master. Do any required setup..
5524 // This is principally telling all the plugins that we're
5525 // now a master, and telling them about all the sessions
5526 // that are active too..
5528 void become_master(void)
5531 static struct event_data d
[RADIUS_FDS
];
5532 struct epoll_event e
;
5534 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
5536 // running a bunch of iptables commands is slow and can cause
5537 // the master to drop tunnels on takeover--kludge around the
5538 // problem by forking for the moment (note: race)
5539 if (!fork_and_close())
5541 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5543 if (!session
[s
].opened
) // Not an in-use session.
5546 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5553 for (i
= 0; i
< RADIUS_FDS
; i
++)
5555 d
[i
].type
= FD_TYPE_RADIUS
;
5559 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5563 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5569 if (CLI_HELP_REQUESTED
)
5570 return CLI_HELP_NO_ARGS
;
5573 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5575 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5578 if (!session
[s
].opened
)
5581 idle
= time_now
- session
[s
].last_data
;
5582 idle
/= 5 ; // In multiples of 5 seconds.
5592 for (i
= 0; i
< 63; ++i
)
5594 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5596 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5597 cli_print(cli
, "%d total sessions open.", count
);
5601 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5607 if (CLI_HELP_REQUESTED
)
5608 return CLI_HELP_NO_ARGS
;
5611 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5613 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5616 if (!session
[s
].opened
)
5619 d
= time_now
- session
[s
].opened
;
5622 while (d
> 1 && open
< 32)
5632 for (i
= 0; i
< 30; ++i
)
5634 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5637 cli_print(cli
, "%d total sessions open.", count
);
5643 * This unencodes the AVP using the L2TP secret and the previously
5644 * stored random vector. It overwrites the hidden data with the
5645 * unhidden AVP subformat.
5647 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5653 uint16_t m
= htons(type
);
5655 // Compute initial pad
5657 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5658 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5659 MD5_Update(&ctx
, vector
, vec_len
);
5660 MD5_Final(digest
, &ctx
);
5662 // pointer to last decoded 16 octets
5667 // calculate a new pad based on the last decoded block
5668 if (d
>= sizeof(digest
))
5671 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5672 MD5_Update(&ctx
, last
, sizeof(digest
));
5673 MD5_Final(digest
, &ctx
);
5679 *value
++ ^= digest
[d
++];
5684 int find_filter(char const *name
, size_t len
)
5689 for (i
= 0; i
< MAXFILTER
; i
++)
5691 if (!*ip_filters
[i
].name
)
5699 if (strlen(ip_filters
[i
].name
) != len
)
5702 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5709 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5713 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5714 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5715 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5716 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5717 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5723 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5727 case FILTER_FLAG_OP_ANY
:
5728 return (flags
& sflags
) || (~flags
& cflags
);
5730 case FILTER_FLAG_OP_ALL
:
5731 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5733 case FILTER_FLAG_OP_EST
:
5734 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5740 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5742 uint16_t frag_offset
;
5746 uint16_t src_port
= 0;
5747 uint16_t dst_port
= 0;
5749 ip_filter_rulet
*rule
;
5751 if (len
< 20) // up to end of destination address
5754 if ((*buf
>> 4) != 4) // IPv4
5757 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5759 src_ip
= *(in_addr_t
*) (buf
+ 12);
5760 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5762 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5764 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5765 if (len
< l
+ 4) // ports
5768 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5769 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5770 if (proto
== IPPROTO_TCP
)
5772 if (len
< l
+ 14) // flags
5775 flags
= buf
[l
+ 13] & 0x3f;
5779 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5781 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5784 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5785 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5788 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5789 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5794 // layer 4 deny rules are skipped
5795 if (rule
->action
== FILTER_ACTION_DENY
&&
5796 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
5804 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5806 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5809 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5812 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5813 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5820 return rule
->action
== FILTER_ACTION_PERMIT
;