3 // Copyright (c) 2003, 2004, 2005 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
7 char const *cvs_id_l2tpns
= "$Id: l2tpns.c,v 1.144 2005/10/11 09:04:53 bodea Exp $";
13 #include <linux/if_tun.h>
18 #include <net/route.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
32 #include <sys/resource.h>
40 #include <sys/sysinfo.h>
48 #include "constants.h"
58 configt
*config
= NULL
; // all configuration
59 int tunfd
= -1; // tun interface file handle. (network device)
60 int udpfd
= -1; // UDP file handle
61 int controlfd
= -1; // Control signal handle
62 int clifd
= -1; // Socket listening for CLI connections.
63 int daefd
= -1; // Socket listening for DAE connections.
64 int snoopfd
= -1; // UDP file handle for sending out intercept data
65 int *radfds
= NULL
; // RADIUS requests file handles
66 int ifrfd
= -1; // File descriptor for routing, etc
67 int ifr6fd
= -1; // File descriptor for IPv6 routing, etc
68 int rand_fd
= -1; // Random data source
69 int cluster_sockfd
= -1; // Intra-cluster communications socket.
70 int epollfd
= -1; // event polling
71 time_t basetime
= 0; // base clock
72 char hostname
[1000] = ""; // us.
73 static int tunidx
; // ifr_ifindex of tun device
74 static int syslog_log
= 0; // are we logging to syslog
75 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id
= 0; // Unique ID for radius accounting
78 // calculated from config->l2tp_mtu
79 uint16_t MRU
= 0; // PPP MRU
80 uint16_t MSS
= 0; // TCP MSS
82 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
83 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
85 static void *ip_hash
[256]; // Mapping from IP address to session structures.
88 struct ipv6radix
*branch
;
89 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
92 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
93 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
96 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
97 time_t time_now
= 0; // Current time in seconds since epoch.
98 static char time_now_string
[64] = {0}; // Current time as a string.
99 int time_changed
= 0; // time_now changed
100 char main_quit
= 0; // True if we're in the process of exiting.
101 char main_reload
= 0; // Re-load pending
102 linked_list
*loaded_plugins
;
103 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
105 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
106 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
108 config_descriptt config_values
[] = {
109 CONFIG("debug", debug
, INT
),
110 CONFIG("log_file", log_filename
, STRING
),
111 CONFIG("pid_file", pid_file
, STRING
),
112 CONFIG("random_device", random_device
, STRING
),
113 CONFIG("l2tp_secret", l2tp_secret
, STRING
),
114 CONFIG("l2tp_mtu", l2tp_mtu
, INT
),
115 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
116 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
117 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
118 CONFIG("primary_dns", default_dns1
, IPv4
),
119 CONFIG("secondary_dns", default_dns2
, IPv4
),
120 CONFIG("primary_radius", radiusserver
[0], IPv4
),
121 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
122 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
123 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
124 CONFIG("radius_accounting", radius_accounting
, BOOL
),
125 CONFIG("radius_interim", radius_interim
, INT
),
126 CONFIG("radius_secret", radiussecret
, STRING
),
127 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
128 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
129 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
130 CONFIG("bind_address", bind_address
, IPv4
),
131 CONFIG("peer_address", peer_address
, IPv4
),
132 CONFIG("send_garp", send_garp
, BOOL
),
133 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
134 CONFIG("throttle_buckets", num_tbfs
, INT
),
135 CONFIG("accounting_dir", accounting_dir
, STRING
),
136 CONFIG("setuid", target_uid
, INT
),
137 CONFIG("dump_speed", dump_speed
, BOOL
),
138 CONFIG("multi_read_count", multi_read_count
, INT
),
139 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
140 CONFIG("lock_pages", lock_pages
, BOOL
),
141 CONFIG("icmp_rate", icmp_rate
, INT
),
142 CONFIG("packet_limit", max_packets
, INT
),
143 CONFIG("cluster_address", cluster_address
, IPv4
),
144 CONFIG("cluster_interface", cluster_interface
, STRING
),
145 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl
, INT
),
146 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
147 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
148 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
149 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
153 static char *plugin_functions
[] = {
160 "plugin_new_session",
161 "plugin_kill_session",
163 "plugin_radius_response",
164 "plugin_radius_reset",
165 "plugin_radius_account",
166 "plugin_become_master",
167 "plugin_new_session_master",
170 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
172 // Counters for shutdown sessions
173 static sessiont shut_acct
[8192];
174 static sessionidt shut_acct_n
= 0;
176 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
177 sessiont
*session
= NULL
; // Array of session structures.
178 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
179 radiust
*radius
= NULL
; // Array of radius structures.
180 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
181 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
182 static controlt
*controlfree
= 0;
183 struct Tstats
*_statistics
= NULL
;
185 struct Tringbuffer
*ringbuffer
= NULL
;
188 static void cache_ipmap(in_addr_t ip
, int s
);
189 static void uncache_ipmap(in_addr_t ip
);
190 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
191 static void free_ip_address(sessionidt s
);
192 static void dump_acct_info(int all
);
193 static void sighup_handler(int sig
);
194 static void shutdown_handler(int sig
);
195 static void sigchild_handler(int sig
);
196 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
197 static void update_config(void);
198 static void read_config_file(void);
199 static void initplugins(void);
200 static int add_plugin(char *plugin_name
);
201 static int remove_plugin(char *plugin_name
);
202 static void plugins_done(void);
203 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
204 static tunnelidt
new_tunnel(void);
205 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
207 // on slaves, alow BGP to withdraw cleanly before exiting
210 // quit actions (master)
211 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
212 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
214 // return internal time (10ths since process startup), set f if given
215 // as a side-effect sets time_now, and time_changed
216 static clockt
now(double *f
)
220 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
221 if (t
.tv_sec
!= time_now
)
226 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
229 // work out a retry time based on try number
230 // This is a straight bounded exponential backoff.
231 // Maximum re-try time is 32 seconds. (2^5).
232 clockt
backoff(uint8_t try)
234 if (try > 5) try = 5; // max backoff
235 return now(NULL
) + 10 * (1 << try);
240 // Log a debug message. Typically called via the LOG macro
242 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
244 static char message
[65536] = {0};
250 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
251 ringbuffer
->tail
= 0;
252 if (ringbuffer
->tail
== ringbuffer
->head
)
253 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
254 ringbuffer
->head
= 0;
256 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
257 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
258 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
259 va_start(ap
, format
);
260 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
265 if (config
->debug
< level
) return;
267 va_start(ap
, format
);
268 vsnprintf(message
, sizeof(message
), format
, ap
);
271 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
273 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
278 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
281 const uint8_t *d
= data
;
283 if (config
->debug
< level
) return;
285 // No support for _log_hex to syslog
288 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
289 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
291 for (i
= 0; i
< maxsize
; )
293 fprintf(log_stream
, "%4X: ", i
);
294 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
296 fprintf(log_stream
, "%02X ", d
[j
]);
298 fputs(": ", log_stream
);
301 for (; j
< i
+ 16; j
++)
303 fputs(" ", log_stream
);
305 fputs(": ", log_stream
);
308 fputs(" ", log_stream
);
309 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
311 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
312 fputc(d
[j
], log_stream
);
314 fputc('.', log_stream
);
317 fputs(" ", log_stream
);
321 fputs("\n", log_stream
);
325 setbuf(log_stream
, NULL
);
329 // update a counter, accumulating 2^32 wraps
330 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
332 uint32_t new = *counter
+ delta
;
339 // initialise the random generator
340 static void initrandom(char *source
)
342 static char path
[sizeof(config
->random_device
)] = "*undefined*";
344 // reinitialise only if we are forced to do so or if the config has changed
345 if (source
&& !strncmp(path
, source
, sizeof(path
)))
348 // close previous source, if any
357 snprintf(path
, sizeof(path
), "%s", source
);
361 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
363 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
364 path
, strerror(errno
));
369 // fill buffer with random data
370 void random_data(uint8_t *buf
, int len
)
377 n
= read(rand_fd
, buf
, len
);
378 if (n
>= len
) return;
383 LOG(0, 0, 0, "Error reading from random source: %s\n",
386 // fall back to rand()
394 // append missing data
396 // not using the low order bits from the prng stream
397 buf
[n
++] = (rand() >> 4) & 0xff;
402 // This adds it to the routing table, advertises it
403 // via BGP if enabled, and stuffs it into the
404 // 'sessionbyip' cache.
406 // 'ip' and 'mask' must be in _host_ order.
408 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
413 if (!mask
) mask
= 0xffffffff;
415 ip
&= mask
; // Force the ip to be the first one in the route.
417 memset(&r
, 0, sizeof(r
));
418 r
.rt_dev
= config
->tundevice
;
419 r
.rt_dst
.sa_family
= AF_INET
;
420 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
421 r
.rt_gateway
.sa_family
= AF_INET
;
422 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
423 r
.rt_genmask
.sa_family
= AF_INET
;
424 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
425 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
427 r
.rt_flags
|= RTF_GATEWAY
;
428 else if (mask
== 0xffffffff)
429 r
.rt_flags
|= RTF_HOST
;
431 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
432 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
433 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
435 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
436 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
440 bgp_add_route(htonl(ip
), htonl(mask
));
442 bgp_del_route(htonl(ip
), htonl(mask
));
445 // Add/Remove the IPs to the 'sessionbyip' cache.
446 // Note that we add the zero address in the case of
447 // a network route. Roll on CIDR.
449 // Note that 's == 0' implies this is the address pool.
450 // We still cache it here, because it will pre-fill
451 // the malloc'ed tree.
455 if (!add
) // Are we deleting a route?
456 s
= 0; // Caching the session as '0' is the same as uncaching.
458 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
463 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
466 char ipv6addr
[INET6_ADDRSTRLEN
];
470 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
474 memset(&rt
, 0, sizeof(rt
));
476 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
477 rt
.rtmsg_dst_len
= prefixlen
;
479 rt
.rtmsg_flags
= RTF_UP
;
480 rt
.rtmsg_ifindex
= tunidx
;
482 LOG(1, 0, 0, "Route %s %s/%d\n",
484 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
487 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
488 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
491 // FIXME: need to add BGP routing (RFC2858)
495 if (!add
) // Are we deleting a route?
496 s
= 0; // Caching the session as '0' is the same as uncaching.
498 cache_ipv6map(ip
, prefixlen
, s
);
504 // defined in linux/ipv6.h, but tricky to include from user-space
505 // TODO: move routing to use netlink rather than ioctl
507 struct in6_addr ifr6_addr
;
508 __u32 ifr6_prefixlen
;
509 unsigned int ifr6_ifindex
;
513 // Set up TUN interface
514 static void inittun(void)
517 struct in6_ifreq ifr6
;
518 struct sockaddr_in sin
= {0};
519 memset(&ifr
, 0, sizeof(ifr
));
520 ifr
.ifr_flags
= IFF_TUN
;
522 tunfd
= open(TUNDEVICE
, O_RDWR
);
525 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
529 int flags
= fcntl(tunfd
, F_GETFL
, 0);
530 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
532 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
534 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
537 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
538 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
539 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
541 sin
.sin_family
= AF_INET
;
542 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
543 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
545 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
547 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
550 /* Bump up the qlen to deal with bursts from the network */
552 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
554 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
557 ifr
.ifr_flags
= IFF_UP
;
558 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
560 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
563 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
565 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
568 tunidx
= ifr
.ifr_ifindex
;
570 // Only setup IPv6 on the tun device if we have a configured prefix
571 if (config
->ipv6_prefix
.s6_addr
[0]) {
572 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
574 // Link local address is FE80::1
575 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
576 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
577 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
578 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
579 ifr6
.ifr6_prefixlen
= 64;
580 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
581 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
583 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
584 " %s\n", strerror(errno
));
587 // Global address is prefix::1
588 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
589 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
590 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
591 ifr6
.ifr6_prefixlen
= 64;
592 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
593 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
595 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
602 static void initudp(void)
605 struct sockaddr_in addr
;
608 memset(&addr
, 0, sizeof(addr
));
609 addr
.sin_family
= AF_INET
;
610 addr
.sin_port
= htons(L2TPPORT
);
611 addr
.sin_addr
.s_addr
= config
->bind_address
;
612 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
613 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
615 int flags
= fcntl(udpfd
, F_GETFL
, 0);
616 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
618 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
620 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
625 memset(&addr
, 0, sizeof(addr
));
626 addr
.sin_family
= AF_INET
;
627 addr
.sin_port
= htons(NSCTL_PORT
);
628 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
629 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
630 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
632 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
636 // Dynamic Authorization Extensions to RADIUS
637 memset(&addr
, 0, sizeof(addr
));
638 addr
.sin_family
= AF_INET
;
639 addr
.sin_port
= htons(config
->radius_dae_port
);
640 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
641 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
642 if (bind(daefd
, (void *) &addr
, sizeof(addr
)) < 0)
644 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
649 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
653 // Find session by IP, < 1 for not found
655 // Confusingly enough, this 'ip' must be
656 // in _network_ order. This being the common
657 // case when looking it up from IP packet headers.
659 // We actually use this cache for two things.
660 // #1. For used IP addresses, this maps to the
661 // session ID that it's used by.
662 // #2. For un-used IP addresses, this maps to the
663 // index into the pool table that contains that
667 static int lookup_ipmap(in_addr_t ip
)
669 uint8_t *a
= (uint8_t *) &ip
;
670 uint8_t **d
= (uint8_t **) ip_hash
;
672 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
673 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
674 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
676 return (int) (intptr_t) d
[(size_t) *a
];
679 static int lookup_ipv6map(struct in6_addr ip
)
681 struct ipv6radix
*curnode
;
684 char ipv6addr
[INET6_ADDRSTRLEN
];
686 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
690 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
692 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
697 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
698 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
705 sessionidt
sessionbyip(in_addr_t ip
)
707 int s
= lookup_ipmap(ip
);
710 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
711 return (sessionidt
) s
;
716 sessionidt
sessionbyipv6(struct in6_addr ip
)
719 CSTAT(sessionbyipv6
);
721 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
722 (ip
.s6_addr
[0] == 0xFE &&
723 ip
.s6_addr
[1] == 0x80 &&
724 ip
.s6_addr16
[1] == 0 &&
725 ip
.s6_addr16
[2] == 0 &&
726 ip
.s6_addr16
[3] == 0)) {
727 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
729 s
= lookup_ipv6map(ip
);
732 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
739 // Take an IP address in HOST byte order and
740 // add it to the sessionid by IP cache.
742 // (It's actually cached in network order)
744 static void cache_ipmap(in_addr_t ip
, int s
)
746 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
747 uint8_t *a
= (uint8_t *) &nip
;
748 uint8_t **d
= (uint8_t **) ip_hash
;
751 for (i
= 0; i
< 3; i
++)
753 if (!d
[(size_t) a
[i
]])
755 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
759 d
= (uint8_t **) d
[(size_t) a
[i
]];
762 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
765 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
768 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
769 // else a map to an ip pool index.
772 static void uncache_ipmap(in_addr_t ip
)
774 cache_ipmap(ip
, 0); // Assign it to the NULL session.
777 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
781 struct ipv6radix
*curnode
;
782 char ipv6addr
[INET6_ADDRSTRLEN
];
784 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
786 bytes
= prefixlen
>> 3;
789 if (curnode
->branch
== NULL
)
791 if (!(curnode
->branch
= calloc(256,
792 sizeof (struct ipv6radix
))))
795 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
802 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
803 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
807 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
808 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
814 // CLI list to dump current ipcache.
816 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
818 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
822 if (CLI_HELP_REQUESTED
)
823 return CLI_HELP_NO_ARGS
;
825 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
827 for (i
= 0; i
< 256; ++i
)
832 for (j
= 0; j
< 256; ++j
)
837 for (k
= 0; k
< 256; ++k
)
842 for (l
= 0; l
< 256; ++l
)
846 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
852 cli_print(cli
, "%d entries in cache", count
);
857 // Find session by username, 0 for not found
858 // walled garden users aren't authenticated, so the username is
859 // reasonably useless. Ignore them to avoid incorrect actions
861 // This is VERY inefficent. Don't call it often. :)
863 sessionidt
sessionbyuser(char *username
)
866 CSTAT(sessionbyuser
);
868 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
870 if (!session
[s
].opened
)
873 if (session
[s
].walled_garden
)
874 continue; // Skip walled garden users.
876 if (!strncmp(session
[s
].user
, username
, 128))
880 return 0; // Not found.
883 void send_garp(in_addr_t ip
)
889 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
892 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
895 memset(&ifr
, 0, sizeof(ifr
));
896 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
897 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
899 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
903 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
904 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
906 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
911 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
914 static sessiont
*sessiontbysessionidt(sessionidt s
)
916 if (!s
|| s
>= MAXSESSION
) return NULL
;
920 static sessionidt
sessionidtbysessiont(sessiont
*s
)
922 sessionidt val
= s
-session
;
923 if (s
< session
|| val
>= MAXSESSION
) return 0;
927 // actually send a control message for a specific tunnel
928 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
930 struct sockaddr_in addr
;
936 static int backtrace_count
= 0;
937 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
938 STAT(tunnel_tx_errors
);
939 log_backtrace(backtrace_count
, 5)
945 static int backtrace_count
= 0;
946 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
947 log_backtrace(backtrace_count
, 5)
948 STAT(tunnel_tx_errors
);
952 memset(&addr
, 0, sizeof(addr
));
953 addr
.sin_family
= AF_INET
;
954 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
955 addr
.sin_port
= htons(tunnel
[t
].port
);
957 // sequence expected, if sequence in message
958 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
960 // If this is a control message, deal with retries
963 tunnel
[t
].last
= time_now
; // control message sent
964 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
967 STAT(tunnel_retries
);
968 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
972 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
974 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
975 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
976 STAT(tunnel_tx_errors
);
980 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
981 STAT(tunnel_tx_packets
);
982 INC_STAT(tunnel_tx_bytes
, l
);
986 // Tiny helper function to write data to
989 int tun_write(uint8_t * data
, int size
)
991 return write(tunfd
, data
, size
);
994 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
995 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
997 int d
= (tcp
[12] >> 4) * 4;
1004 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1007 if (tcp
+ d
> buf
+ len
) // short?
1015 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1018 if (mss
+ 2 > data
) return; // short?
1022 if (*opts
== 0) return; // end of options
1023 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1026 opts
+= opts
[1]; // skip over option
1029 if (!mss
) return; // not found
1030 orig
= ntohs(*(uint16_t *) mss
);
1032 if (orig
<= MSS
) return; // mss OK
1034 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1035 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1036 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1037 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1040 *(int16_t *) mss
= htons(MSS
);
1042 // adjust checksum (see rfc1141)
1043 sum
= orig
+ (~MSS
& 0xffff);
1044 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1045 sum
= (sum
& 0xffff) + (sum
>> 16);
1046 *(uint16_t *) (tcp
+ 16) = htons(sum
);
1049 // process outgoing (to tunnel) IP
1051 static void processipout(uint8_t *buf
, int len
)
1058 uint8_t *data
= buf
; // Keep a copy of the originals.
1061 uint8_t b
[MAXETHER
+ 20];
1063 CSTAT(processipout
);
1065 if (len
< MIN_IP_SIZE
)
1067 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1068 STAT(tun_rx_errors
);
1071 if (len
>= MAXETHER
)
1073 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1074 STAT(tun_rx_errors
);
1078 // Skip the tun header
1082 // Got an IP header now
1083 if (*(uint8_t *)(buf
) >> 4 != 4)
1085 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1089 ip
= *(uint32_t *)(buf
+ 16);
1090 if (!(s
= sessionbyip(ip
)))
1092 // Is this a packet for a session that doesn't exist?
1093 static int rate
= 0; // Number of ICMP packets we've sent this second.
1094 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1096 if (last
!= time_now
)
1102 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1104 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1105 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1106 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1110 t
= session
[s
].tunnel
;
1113 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1114 if (config
->max_packets
> 0)
1116 if (sess_local
[s
].last_packet_out
== TIME
)
1118 int max
= config
->max_packets
;
1120 // All packets for throttled sessions are handled by the
1121 // master, so further limit by using the throttle rate.
1122 // A bit of a kludge, since throttle rate is in kbps,
1123 // but should still be generous given our average DSL
1124 // packet size is 200 bytes: a limit of 28kbps equates
1125 // to around 180 packets per second.
1126 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1127 max
= sp
->throttle_out
;
1129 if (++sess_local
[s
].packets_out
> max
)
1131 sess_local
[s
].packets_dropped
++;
1137 if (sess_local
[s
].packets_dropped
)
1139 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1140 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1141 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1142 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1146 sess_local
[s
].last_packet_out
= TIME
;
1147 sess_local
[s
].packets_out
= 1;
1148 sess_local
[s
].packets_dropped
= 0;
1152 // run access-list if any
1153 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1156 // adjust MSS on SYN and SYN,ACK packets with options
1157 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1159 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1160 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1161 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1166 // Are we throttling this session?
1167 if (config
->cluster_iam_master
)
1168 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1170 master_throttle_packet(sp
->tbf_out
, data
, size
);
1173 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1175 // We are walled-gardening this
1176 master_garden_packet(s
, data
, size
);
1180 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1182 // Add on L2TP header
1184 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
);
1186 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1189 // Snooping this session, send it to intercept box
1190 if (sp
->snoop_ip
&& sp
->snoop_port
)
1191 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1193 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1194 sp
->cout_delta
+= len
;
1198 sess_local
[s
].cout
+= len
; // To send to master..
1199 sess_local
[s
].pout
++;
1202 // process outgoing (to tunnel) IPv6
1204 static void processipv6out(uint8_t * buf
, int len
)
1210 struct in6_addr ip6
;
1212 uint8_t *data
= buf
; // Keep a copy of the originals.
1215 uint8_t b
[MAXETHER
+ 20];
1217 CSTAT(processipv6out
);
1219 if (len
< MIN_IP_SIZE
)
1221 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1222 STAT(tunnel_tx_errors
);
1225 if (len
>= MAXETHER
)
1227 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1228 STAT(tunnel_tx_errors
);
1232 // Skip the tun header
1236 // Got an IP header now
1237 if (*(uint8_t *)(buf
) >> 4 != 6)
1239 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1243 ip6
= *(struct in6_addr
*)(buf
+24);
1244 s
= sessionbyipv6(ip6
);
1248 ip
= *(uint32_t *)(buf
+ 32);
1249 s
= sessionbyip(ip
);
1254 // Is this a packet for a session that doesn't exist?
1255 static int rate
= 0; // Number of ICMP packets we've sent this second.
1256 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1258 if (last
!= time_now
)
1264 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1266 // FIXME: Should send icmp6 host unreachable
1270 t
= session
[s
].tunnel
;
1273 // FIXME: add DoS prevention/filters?
1277 // Are we throttling this session?
1278 if (config
->cluster_iam_master
)
1279 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1281 master_throttle_packet(sp
->tbf_out
, data
, size
);
1284 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1286 // We are walled-gardening this
1287 master_garden_packet(s
, data
, size
);
1291 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1293 // Add on L2TP header
1295 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
);
1297 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1300 // Snooping this session, send it to intercept box
1301 if (sp
->snoop_ip
&& sp
->snoop_port
)
1302 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1304 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1305 sp
->cout_delta
+= len
;
1309 sess_local
[s
].cout
+= len
; // To send to master..
1310 sess_local
[s
].pout
++;
1314 // Helper routine for the TBF filters.
1315 // Used to send queued data in to the user!
1317 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1323 uint8_t b
[MAXETHER
+ 20];
1325 if (len
< 0 || len
> MAXETHER
)
1327 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1331 // Skip the tun header
1335 ip
= *(in_addr_t
*)(buf
+ 16);
1340 t
= session
[s
].tunnel
;
1343 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1345 // Add on L2TP header
1347 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
);
1349 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1352 // Snooping this session.
1353 if (sp
->snoop_ip
&& sp
->snoop_port
)
1354 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1356 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1357 sp
->cout_delta
+= len
;
1361 sess_local
[s
].cout
+= len
; // To send to master..
1362 sess_local
[s
].pout
++;
1365 // add an AVP (16 bit)
1366 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1368 uint16_t l
= (m
? 0x8008 : 0x0008);
1369 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1370 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1371 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1372 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1376 // add an AVP (32 bit)
1377 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1379 uint16_t l
= (m
? 0x800A : 0x000A);
1380 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1381 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1382 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1383 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1387 // add an AVP (string)
1388 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1390 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1391 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1392 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1393 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1394 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1395 c
->length
+= 6 + strlen(val
);
1399 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1401 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1402 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1403 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1404 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1405 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1406 c
->length
+= 6 + len
;
1409 // new control connection
1410 static controlt
*controlnew(uint16_t mtype
)
1414 c
= malloc(sizeof(controlt
));
1418 controlfree
= c
->next
;
1422 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1424 control16(c
, 0, mtype
, 1);
1428 // send zero block if nothing is waiting
1430 static void controlnull(tunnelidt t
)
1433 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1436 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1437 *(uint16_t *) (buf
+ 2) = htons(12); // length
1438 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1439 *(uint16_t *) (buf
+ 6) = htons(0); // session
1440 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1441 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1442 tunnelsend(buf
, 12, t
);
1445 // add a control message to a tunnel, and send if within window
1446 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1448 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1449 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1450 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1451 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1452 tunnel
[t
].ns
++; // advance sequence
1453 // link in message in to queue
1454 if (tunnel
[t
].controlc
)
1455 tunnel
[t
].controle
->next
= c
;
1457 tunnel
[t
].controls
= c
;
1459 tunnel
[t
].controle
= c
;
1460 tunnel
[t
].controlc
++;
1462 // send now if space in window
1463 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1465 tunnel
[t
].try = 0; // first send
1466 tunnelsend(c
->buf
, c
->length
, t
);
1471 // Throttle or Unthrottle a session
1473 // Throttle the data from/to through a session to no more than
1474 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1477 // If either value is -1, the current value is retained for that
1480 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1482 if (!session
[s
].opened
)
1483 return; // No-one home.
1485 if (!*session
[s
].user
)
1486 return; // User not logged in
1490 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1491 if (session
[s
].tbf_in
)
1492 free_tbf(session
[s
].tbf_in
);
1495 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1497 session
[s
].tbf_in
= 0;
1499 session
[s
].throttle_in
= rate_in
;
1504 int bytes
= rate_out
* 1024 / 8;
1505 if (session
[s
].tbf_out
)
1506 free_tbf(session
[s
].tbf_out
);
1509 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1511 session
[s
].tbf_out
= 0;
1513 session
[s
].throttle_out
= rate_out
;
1517 // add/remove filters from session (-1 = no change)
1518 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1520 if (!session
[s
].opened
)
1521 return; // No-one home.
1523 if (!*session
[s
].user
)
1524 return; // User not logged in
1527 if (filter_in
> MAXFILTER
) filter_in
= -1;
1528 if (filter_out
> MAXFILTER
) filter_out
= -1;
1529 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1530 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1534 if (session
[s
].filter_in
)
1535 ip_filters
[session
[s
].filter_in
- 1].used
--;
1538 ip_filters
[filter_in
- 1].used
++;
1540 session
[s
].filter_in
= filter_in
;
1543 if (filter_out
>= 0)
1545 if (session
[s
].filter_out
)
1546 ip_filters
[session
[s
].filter_out
- 1].used
--;
1549 ip_filters
[filter_out
- 1].used
++;
1551 session
[s
].filter_out
= filter_out
;
1555 // start tidy shutdown of session
1556 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1558 int walled_garden
= session
[s
].walled_garden
;
1561 CSTAT(sessionshutdown
);
1563 if (!session
[s
].opened
)
1565 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1566 return; // not a live session
1569 if (!session
[s
].die
)
1571 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1572 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1573 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1576 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1578 // RADIUS Stop message
1579 uint16_t r
= radiusnew(s
);
1582 // stop, if not already trying
1583 if (radius
[r
].state
!= RADIUSSTOP
)
1584 radiussend(r
, RADIUSSTOP
);
1587 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1589 // Save counters to dump to accounting file
1590 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1591 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1595 { // IP allocated, clear and unroute
1598 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1600 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1601 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1604 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1605 session
[s
].route
[r
].ip
= 0;
1608 if (session
[s
].ip_pool_index
== -1) // static ip
1610 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1616 // unroute IPv6, if setup
1617 if (session
[s
].ppp
.ipv6cp
== Opened
&& session
[s
].ipv6prefixlen
)
1618 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1621 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1622 throttle_session(s
, 0, 0);
1626 controlt
*c
= controlnew(14); // sending CDN
1630 *(uint16_t *) buf
= htons(result
);
1631 *(uint16_t *) (buf
+2) = htons(error
);
1632 controlb(c
, 1, buf
, 4, 1);
1635 control16(c
, 1, result
, 1);
1637 control16(c
, 14, s
, 1); // assigned session (our end)
1638 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
1641 if (!session
[s
].die
)
1642 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1644 // update filter refcounts
1645 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1646 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1649 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
1650 sess_local
[s
].lcp
.restart
= 0;
1651 sess_local
[s
].ipcp
.restart
= 0;
1652 sess_local
[s
].ipv6cp
.restart
= 0;
1653 sess_local
[s
].ccp
.restart
= 0;
1655 cluster_send_session(s
);
1658 void sendipcp(sessionidt s
, tunnelidt t
)
1660 uint8_t buf
[MAXETHER
];
1664 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
1666 if (!session
[s
].unique_id
)
1668 if (!++last_id
) ++last_id
; // skip zero
1669 session
[s
].unique_id
= last_id
;
1672 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
);
1676 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
1677 *(uint16_t *) (q
+ 2) = htons(10); // packet length
1678 q
[4] = 3; // ip address option
1679 q
[5] = 6; // option length
1680 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1681 config
->bind_address
? config
->bind_address
:
1682 my_address
; // send my IP
1684 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1687 void sendipv6cp(sessionidt s
, tunnelidt t
)
1689 uint8_t buf
[MAXETHER
];
1693 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
1695 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
);
1699 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
1700 // only send one type
1702 *(uint16_t *) (q
+ 2) = htons(14);
1703 q
[4] = 1; // interface identifier option
1704 q
[5] = 10; // option length
1705 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1706 *(uint32_t *) (q
+ 10) = 0;
1709 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1712 static void sessionclear(sessionidt s
)
1714 memset(&session
[s
], 0, sizeof(session
[s
]));
1715 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1716 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1718 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1719 session
[s
].next
= sessionfree
;
1723 // kill a session now
1724 void sessionkill(sessionidt s
, char *reason
)
1729 if (!session
[s
].opened
) // not alive
1732 if (session
[s
].next
)
1734 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1738 session
[s
].die
= TIME
;
1739 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1740 if (sess_local
[s
].radius
)
1741 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1743 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1745 cluster_send_session(s
);
1748 static void tunnelclear(tunnelidt t
)
1751 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1752 tunnel
[t
].state
= TUNNELFREE
;
1755 // kill a tunnel now
1756 static void tunnelkill(tunnelidt t
, char *reason
)
1763 tunnel
[t
].state
= TUNNELDIE
;
1765 // free control messages
1766 while ((c
= tunnel
[t
].controls
))
1768 controlt
* n
= c
->next
;
1769 tunnel
[t
].controls
= n
;
1770 tunnel
[t
].controlc
--;
1771 c
->next
= controlfree
;
1775 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1776 if (session
[s
].tunnel
== t
)
1777 sessionkill(s
, reason
);
1781 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1782 cli_tunnel_actions
[t
].action
= 0;
1783 cluster_send_tunnel(t
);
1786 // shut down a tunnel cleanly
1787 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1791 CSTAT(tunnelshutdown
);
1793 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1795 // never set up, can immediately kill
1796 tunnelkill(t
, reason
);
1799 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1802 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1803 if (session
[s
].tunnel
== t
)
1804 sessionshutdown(s
, reason
, 0, 0);
1806 tunnel
[t
].state
= TUNNELDIE
;
1807 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1808 cluster_send_tunnel(t
);
1809 // TBA - should we wait for sessions to stop?
1812 controlt
*c
= controlnew(4); // sending StopCCN
1817 *(uint16_t *) buf
= htons(result
);
1818 *(uint16_t *) (buf
+2) = htons(error
);
1821 int m
= strlen(msg
);
1822 if (m
+ 4 > sizeof(buf
))
1823 m
= sizeof(buf
) - 4;
1825 memcpy(buf
+4, msg
, m
);
1829 controlb(c
, 1, buf
, l
, 1);
1832 control16(c
, 1, result
, 1);
1834 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1835 controladd(c
, 0, t
); // send the message
1839 // read and process packet on tunnel (UDP)
1840 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
1842 uint8_t *chapresponse
= NULL
;
1843 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1844 uint8_t *p
= buf
+ 2;
1851 LOG_HEX(5, "UDP Data", buf
, len
);
1852 STAT(tunnel_rx_packets
);
1853 INC_STAT(tunnel_rx_bytes
, len
);
1856 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1857 STAT(tunnel_rx_errors
);
1860 if ((buf
[1] & 0x0F) != 2)
1862 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1863 STAT(tunnel_rx_errors
);
1868 l
= ntohs(*(uint16_t *) p
);
1871 t
= ntohs(*(uint16_t *) p
);
1873 s
= ntohs(*(uint16_t *) p
);
1875 if (s
>= MAXSESSION
)
1877 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1878 STAT(tunnel_rx_errors
);
1883 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1884 STAT(tunnel_rx_errors
);
1889 ns
= ntohs(*(uint16_t *) p
);
1891 nr
= ntohs(*(uint16_t *) p
);
1896 uint16_t o
= ntohs(*(uint16_t *) p
);
1901 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1902 STAT(tunnel_rx_errors
);
1907 // used to time out old tunnels
1908 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
1909 tunnel
[t
].lastrec
= time_now
;
1913 uint16_t message
= 0xFFFF; // message type
1915 uint8_t mandatory
= 0;
1916 uint16_t asession
= 0; // assigned session
1917 uint32_t amagic
= 0; // magic number
1918 uint8_t aflags
= 0; // flags from last LCF
1919 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1920 char called
[MAXTEL
] = ""; // called number
1921 char calling
[MAXTEL
] = ""; // calling number
1923 if (!config
->cluster_iam_master
)
1925 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1929 // control messages must have bits 0x80|0x40|0x08
1930 // (type, length and sequence) set, and bits 0x02|0x01
1931 // (offset and priority) clear
1932 if ((*buf
& 0xCB) != 0xC8)
1934 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1935 STAT(tunnel_rx_errors
);
1939 // check for duplicate tunnel open message
1945 // Is this a duplicate of the first packet? (SCCRQ)
1947 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1949 if (tunnel
[i
].state
!= TUNNELOPENING
||
1950 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1951 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1954 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1959 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1960 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1962 // if no tunnel specified, assign one
1965 if (!(t
= new_tunnel()))
1967 LOG(1, 0, 0, "No more tunnels\n");
1968 STAT(tunnel_overflow
);
1972 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1973 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1974 tunnel
[t
].window
= 4; // default window
1975 STAT(tunnel_created
);
1976 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1977 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1980 // If the 'ns' just received is not the 'nr' we're
1981 // expecting, just send an ack and drop it.
1983 // if 'ns' is less, then we got a retransmitted packet.
1984 // if 'ns' is greater than missed a packet. Either way
1985 // we should ignore it.
1986 if (ns
!= tunnel
[t
].nr
)
1988 // is this the sequence we were expecting?
1989 STAT(tunnel_rx_errors
);
1990 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1991 t
, ns
, tunnel
[t
].nr
);
1993 if (l
) // Is this not a ZLB?
1998 // check sequence of this message
2000 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2001 // some to clear maybe?
2002 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2004 controlt
*c
= tunnel
[t
].controls
;
2005 tunnel
[t
].controls
= c
->next
;
2006 tunnel
[t
].controlc
--;
2007 c
->next
= controlfree
;
2010 tunnel
[t
].try = 0; // we have progress
2013 // receiver advance (do here so quoted correctly in any sends below)
2014 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2015 if (skip
< 0) skip
= 0;
2016 if (skip
< tunnel
[t
].controlc
)
2018 // some control packets can now be sent that were previous stuck out of window
2019 int tosend
= tunnel
[t
].window
- skip
;
2020 controlt
*c
= tunnel
[t
].controls
;
2028 tunnel
[t
].try = 0; // first send
2029 tunnelsend(c
->buf
, c
->length
, t
);
2034 if (!tunnel
[t
].controlc
)
2035 tunnel
[t
].retry
= 0; // caught up
2038 { // if not a null message
2044 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2046 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2052 LOG(1, s
, t
, "Invalid length in AVP\n");
2053 STAT(tunnel_rx_errors
);
2058 if (flags
& 0x3C) // reserved bits, should be clear
2060 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2062 result
= 2; // general error
2063 error
= 3; // reserved field non-zero
2068 if (*(uint16_t *) (b
))
2070 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
2072 result
= 2; // general error
2073 error
= 6; // generic vendor-specific error
2074 msg
= "unsupported vendor-specific";
2078 mtype
= ntohs(*(uint16_t *) (b
));
2086 // handle hidden AVPs
2087 if (!*config
->l2tp_secret
)
2089 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2091 result
= 2; // general error
2092 error
= 6; // generic vendor-specific error
2093 msg
= "secret not specified";
2096 if (!session
[s
].random_vector_length
)
2098 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2100 result
= 2; // general error
2101 error
= 6; // generic
2102 msg
= "no random vector";
2107 LOG(2, s
, t
, "Short hidden AVP.\n");
2109 result
= 2; // general error
2110 error
= 2; // length is wrong
2116 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2118 orig_len
= ntohs(*(uint16_t *) b
);
2119 if (orig_len
> n
+ 2)
2121 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2125 result
= 2; // general error
2126 error
= 2; // length is wrong
2135 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2136 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2140 case 0: // message type
2141 message
= ntohs(*(uint16_t *) b
);
2142 mandatory
= flags
& 0x80;
2143 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_code(message
));
2145 case 1: // result code
2147 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2148 const char* resdesc
= "(unknown)";
2151 resdesc
= l2tp_stopccn_result_code(rescode
);
2153 else if (message
== 14)
2155 resdesc
= l2tp_cdn_result_code(rescode
);
2158 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2161 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2162 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, l2tp_error_code(errcode
));
2165 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2170 case 2: // protocol version
2172 version
= ntohs(*(uint16_t *) (b
));
2173 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2174 if (version
&& version
!= 0x0100)
2175 { // allow 0.0 and 1.0
2176 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2178 result
= 5; // unspported protocol version
2179 error
= 0x0100; // supported version
2185 case 3: // framing capabilities
2186 // LOG(4, s, t, "Framing capabilities\n");
2188 case 4: // bearer capabilities
2189 // LOG(4, s, t, "Bearer capabilities\n");
2191 case 5: // tie breaker
2192 // We never open tunnels, so we don't care about tie breakers
2193 // LOG(4, s, t, "Tie breaker\n");
2195 case 6: // firmware revision
2196 // LOG(4, s, t, "Firmware revision\n");
2198 case 7: // host name
2199 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2200 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2201 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2202 // TBA - to send to RADIUS
2204 case 8: // vendor name
2205 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2206 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2207 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2209 case 9: // assigned tunnel
2210 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2211 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2213 case 10: // rx window
2214 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2215 if (!tunnel
[t
].window
)
2216 tunnel
[t
].window
= 1; // window of 0 is silly
2217 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2219 case 11: // Challenge
2221 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2222 build_chap_response(b
, 2, n
, &chapresponse
);
2225 case 13: // Response
2226 // Why did they send a response? We never challenge.
2227 LOG(2, s
, t
, " received unexpected challenge response\n");
2230 case 14: // assigned session
2231 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2232 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2234 case 15: // call serial number
2235 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2237 case 18: // bearer type
2238 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2241 case 19: // framing type
2242 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2245 case 21: // called number
2246 memset(called
, 0, sizeof(called
));
2247 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2248 LOG(4, s
, t
, " Called <%s>\n", called
);
2250 case 22: // calling number
2251 memset(calling
, 0, sizeof(calling
));
2252 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2253 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2257 case 24: // tx connect speed
2260 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2264 // AS5300s send connect speed as a string
2266 memset(tmp
, 0, sizeof(tmp
));
2267 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2268 session
[s
].tx_connect_speed
= atol(tmp
);
2270 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2272 case 38: // rx connect speed
2275 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2279 // AS5300s send connect speed as a string
2281 memset(tmp
, 0, sizeof(tmp
));
2282 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2283 session
[s
].rx_connect_speed
= atol(tmp
);
2285 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2287 case 25: // Physical Channel ID
2289 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2290 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2293 case 29: // Proxy Authentication Type
2295 uint16_t atype
= ntohs(*(uint16_t *)b
);
2296 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, ppp_auth_type(atype
));
2299 case 30: // Proxy Authentication Name
2302 memset(authname
, 0, sizeof(authname
));
2303 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2304 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2308 case 31: // Proxy Authentication Challenge
2310 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2313 case 32: // Proxy Authentication ID
2315 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2316 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2319 case 33: // Proxy Authentication Response
2320 LOG(4, s
, t
, " Proxy Auth Response\n");
2322 case 27: // last sent lcp
2323 { // find magic number
2324 uint8_t *p
= b
, *e
= p
+ n
;
2325 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2327 if (*p
== 5 && p
[1] == 6) // Magic-Number
2328 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2329 else if (*p
== 7) // Protocol-Field-Compression
2330 aflags
|= SESSIONPFC
;
2331 else if (*p
== 8) // Address-and-Control-Field-Compression
2332 aflags
|= SESSIONACFC
;
2337 case 28: // last recv lcp confreq
2339 case 26: // Initial Received LCP CONFREQ
2341 case 39: // seq required - we control it as an LNS anyway...
2343 case 36: // Random Vector
2344 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2345 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2346 if (n
> sizeof(session
[s
].random_vector
))
2347 n
= sizeof(session
[s
].random_vector
);
2348 memcpy(session
[s
].random_vector
, b
, n
);
2349 session
[s
].random_vector_length
= n
;
2353 static char e
[] = "unknown AVP 0xXXXX";
2354 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2356 result
= 2; // general error
2357 error
= 8; // unknown mandatory AVP
2358 sprintf((msg
= e
) + 14, "%04x", mtype
);
2365 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2369 case 1: // SCCRQ - Start Control Connection Request
2370 tunnel
[t
].state
= TUNNELOPENING
;
2371 if (main_quit
!= QUIT_SHUTDOWN
)
2373 controlt
*c
= controlnew(2); // sending SCCRP
2374 control16(c
, 2, version
, 1); // protocol version
2375 control32(c
, 3, 3, 1); // framing
2376 controls(c
, 7, hostname
, 1); // host name
2377 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2378 control16(c
, 9, t
, 1); // assigned tunnel
2379 controladd(c
, 0, t
); // send the resply
2383 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2387 tunnel
[t
].state
= TUNNELOPEN
;
2390 tunnel
[t
].state
= TUNNELOPEN
;
2391 controlnull(t
); // ack
2394 controlnull(t
); // ack
2395 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2398 controlnull(t
); // simply ACK
2410 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2412 controlt
*c
= controlnew(11); // ICRP
2415 sessionfree
= session
[s
].next
;
2416 memset(&session
[s
], 0, sizeof(session
[s
]));
2418 if (s
> config
->cluster_highest_sessionid
)
2419 config
->cluster_highest_sessionid
= s
;
2421 session
[s
].opened
= time_now
;
2422 session
[s
].tunnel
= t
;
2423 session
[s
].far
= asession
;
2424 session
[s
].last_packet
= time_now
;
2425 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2426 control16(c
, 14, s
, 1); // assigned session
2427 controladd(c
, asession
, t
); // send the reply
2429 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2430 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2432 session
[s
].ppp
.phase
= Establish
;
2433 session
[s
].ppp
.lcp
= Starting
;
2435 STAT(session_created
);
2440 controlt
*c
= controlnew(14); // CDN
2443 STAT(session_overflow
);
2444 LOG(1, 0, t
, "No free sessions\n");
2445 control16(c
, 1, 4, 0); // temporary lack of resources
2448 control16(c
, 1, 2, 7); // shutting down, try another
2450 controladd(c
, asession
, t
); // send the message
2457 if (amagic
== 0) amagic
= time_now
;
2458 session
[s
].magic
= amagic
; // set magic number
2459 session
[s
].l2tp_flags
= aflags
; // set flags received
2460 session
[s
].mru
= PPPMTU
; // default
2461 controlnull(t
); // ack
2464 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2465 sess_local
[s
].lcp
.conf_sent
= 1;
2466 sess_local
[s
].lcp
.nak_sent
= 0;
2467 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
2468 sess_local
[s
].ppp_mru
= MRU
;
2469 session
[s
].ppp
.lcp
= RequestSent
;
2474 controlnull(t
); // ack
2475 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2478 LOG(1, s
, t
, "Missing message type\n");
2481 STAT(tunnel_rx_errors
);
2483 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2485 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2488 if (chapresponse
) free(chapresponse
);
2489 cluster_send_tunnel(t
);
2493 LOG(4, s
, t
, " Got a ZLB ack\n");
2500 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2501 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2502 { // HDLC address header, discard
2508 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2509 STAT(tunnel_rx_errors
);
2519 proto
= ntohs(*(uint16_t *) p
);
2524 if (s
&& !session
[s
].opened
) // Is something wrong??
2526 if (!config
->cluster_iam_master
)
2528 // Pass it off to the master to deal with..
2529 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2534 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2535 STAT(tunnel_rx_errors
);
2539 if (proto
== PPPPAP
)
2541 session
[s
].last_packet
= time_now
;
2542 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2543 processpap(s
, t
, p
, l
);
2545 else if (proto
== PPPCHAP
)
2547 session
[s
].last_packet
= time_now
;
2548 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2549 processchap(s
, t
, p
, l
);
2551 else if (proto
== PPPLCP
)
2553 session
[s
].last_packet
= time_now
;
2554 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2555 processlcp(s
, t
, p
, l
);
2557 else if (proto
== PPPIPCP
)
2559 session
[s
].last_packet
= time_now
;
2560 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2561 processipcp(s
, t
, p
, l
);
2563 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
2565 session
[s
].last_packet
= time_now
;
2566 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2567 processipv6cp(s
, t
, p
, l
);
2569 else if (proto
== PPPCCP
)
2571 session
[s
].last_packet
= time_now
;
2572 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2573 processccp(s
, t
, p
, l
);
2575 else if (proto
== PPPIP
)
2579 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2580 return; // closing session, PPP not processed
2583 session
[s
].last_packet
= time_now
;
2584 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2586 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2590 processipin(s
, t
, p
, l
);
2592 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
2596 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2597 return; // closing session, PPP not processed
2600 session
[s
].last_packet
= time_now
;
2601 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2603 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2607 processipv6in(s
, t
, p
, l
);
2609 else if (session
[s
].ppp
.lcp
== Opened
)
2611 uint8_t buf
[MAXETHER
];
2613 int mru
= session
[s
].mru
;
2614 if (mru
> sizeof(buf
)) mru
= sizeof(buf
);
2617 if (l
> mru
) l
= mru
;
2619 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPLCP
);
2623 *(q
+ 1) = ++sess_local
[s
].lcp_ident
;
2624 *(uint16_t *)(q
+ 2) = htons(l
);
2625 *(uint16_t *)(q
+ 4) = htons(proto
);
2626 memcpy(q
+ 6, p
, l
- 6);
2628 if (proto
== PPPIPV6CP
)
2629 LOG(3, s
, t
, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
2631 LOG(2, s
, t
, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto
);
2633 tunnelsend(buf
, l
+ (q
- buf
), t
);
2637 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
2638 proto
, ppp_state(session
[s
].ppp
.lcp
));
2643 // read and process packet on tun
2644 static void processtun(uint8_t * buf
, int len
)
2646 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2647 STAT(tun_rx_packets
);
2648 INC_STAT(tun_rx_bytes
, len
);
2656 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2657 STAT(tun_rx_errors
);
2661 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2662 processipout(buf
, len
);
2663 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2664 && config
->ipv6_prefix
.s6_addr
[0])
2665 processipv6out(buf
, len
);
2670 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2671 // that we look at the whole of the tunnel, radius and session tables
2673 static void regular_cleanups(double period
)
2675 // Next tunnel, radius and session to check for actions on.
2676 static tunnelidt t
= 0;
2678 static sessionidt s
= 0;
2691 // divide up tables into slices based on the last run
2692 t_slice
= config
->cluster_highest_tunnelid
* period
;
2693 r_slice
= (MAXRADIUS
- 1) * period
;
2694 s_slice
= config
->cluster_highest_sessionid
* period
;
2698 else if (t_slice
> config
->cluster_highest_tunnelid
)
2699 t_slice
= config
->cluster_highest_tunnelid
;
2703 else if (r_slice
> (MAXRADIUS
- 1))
2704 r_slice
= MAXRADIUS
- 1;
2708 else if (s_slice
> config
->cluster_highest_sessionid
)
2709 s_slice
= config
->cluster_highest_sessionid
;
2711 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2713 for (i
= 0; i
< t_slice
; i
++)
2716 if (t
> config
->cluster_highest_tunnelid
)
2719 // check for expired tunnels
2720 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2722 STAT(tunnel_timeout
);
2723 tunnelkill(t
, "Expired");
2727 // check for message resend
2728 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2730 // resend pending messages as timeout on reply
2731 if (tunnel
[t
].retry
<= TIME
)
2733 controlt
*c
= tunnel
[t
].controls
;
2734 uint8_t w
= tunnel
[t
].window
;
2735 tunnel
[t
].try++; // another try
2736 if (tunnel
[t
].try > 5)
2737 tunnelkill(t
, "Timeout on control message"); // game over
2741 tunnelsend(c
->buf
, c
->length
, t
);
2749 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
2751 controlt
*c
= controlnew(6); // sending HELLO
2752 controladd(c
, 0, t
); // send the message
2753 LOG(3, 0, t
, "Sending HELLO message\n");
2757 // Check for tunnel changes requested from the CLI
2758 if ((a
= cli_tunnel_actions
[t
].action
))
2760 cli_tunnel_actions
[t
].action
= 0;
2761 if (a
& CLI_TUN_KILL
)
2763 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2764 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2770 for (i
= 0; i
< r_slice
; i
++)
2776 if (!radius
[r
].state
)
2779 if (radius
[r
].retry
<= TIME
)
2786 for (i
= 0; i
< s_slice
; i
++)
2789 if (s
> config
->cluster_highest_sessionid
)
2792 if (!session
[s
].opened
) // Session isn't in use
2795 // check for expired sessions
2798 if (session
[s
].die
<= TIME
)
2800 sessionkill(s
, "Expired");
2807 if (sess_local
[s
].lcp
.restart
<= time_now
)
2809 int next_state
= session
[s
].ppp
.lcp
;
2810 switch (session
[s
].ppp
.lcp
)
2814 next_state
= RequestSent
;
2817 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
2819 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
2820 sess_local
[s
].lcp
.restart
= time_now
+ config
->ppp_restart_time
;
2821 sess_local
[s
].lcp
.conf_sent
++;
2822 sendlcp(s
, session
[s
].tunnel
);
2823 change_state(s
, lcp
, next_state
);
2827 sessionshutdown(s
, "No response to LCP ConfigReq.", 3, 0);
2828 STAT(session_timeout
);
2838 if (sess_local
[s
].ipcp
.restart
<= time_now
)
2840 int next_state
= session
[s
].ppp
.ipcp
;
2841 switch (session
[s
].ppp
.ipcp
)
2845 next_state
= RequestSent
;
2848 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
2850 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
2851 sess_local
[s
].ipcp
.restart
= time_now
+ config
->ppp_restart_time
;
2852 sess_local
[s
].ipcp
.conf_sent
++;
2853 sendipcp(s
, session
[s
].tunnel
);
2854 change_state(s
, ipcp
, next_state
);
2858 sessionshutdown(s
, "No response to IPCP ConfigReq.", 3, 0);
2859 STAT(session_timeout
);
2869 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
2871 int next_state
= session
[s
].ppp
.ipv6cp
;
2872 switch (session
[s
].ppp
.ipv6cp
)
2876 next_state
= RequestSent
;
2879 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
2881 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
2882 sess_local
[s
].ipv6cp
.restart
= time_now
+ config
->ppp_restart_time
;
2883 sess_local
[s
].ipv6cp
.conf_sent
++;
2884 sendipv6cp(s
, session
[s
].tunnel
);
2885 change_state(s
, ipv6cp
, next_state
);
2889 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
2890 change_state(s
, ipv6cp
, Stopped
);
2897 if (sess_local
[s
].ccp
.restart
<= time_now
)
2899 int next_state
= session
[s
].ppp
.ccp
;
2900 switch (session
[s
].ppp
.ccp
)
2904 next_state
= RequestSent
;
2907 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
2909 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
2910 sess_local
[s
].ccp
.restart
= time_now
+ config
->ppp_restart_time
;
2911 sess_local
[s
].ccp
.conf_sent
++;
2912 sendccp(s
, session
[s
].tunnel
);
2913 change_state(s
, ccp
, next_state
);
2917 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
2918 change_state(s
, ccp
, Stopped
);
2925 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2926 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2928 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2929 STAT(session_timeout
);
2934 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2935 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2937 uint8_t b
[MAXETHER
];
2939 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
);
2943 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2944 *(uint16_t *)(q
+ 2) = htons(8); // Length
2945 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2947 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2948 (int)(time_now
- session
[s
].last_packet
));
2949 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2953 // Check for actions requested from the CLI
2954 if ((a
= cli_session_actions
[s
].action
))
2958 cli_session_actions
[s
].action
= 0;
2959 if (a
& CLI_SESS_KILL
)
2961 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2962 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2963 a
= 0; // dead, no need to check for other actions
2967 if (a
& CLI_SESS_NOSNOOP
)
2969 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2970 session
[s
].snoop_ip
= 0;
2971 session
[s
].snoop_port
= 0;
2975 else if (a
& CLI_SESS_SNOOP
)
2977 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2978 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2979 cli_session_actions
[s
].snoop_port
);
2981 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2982 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2987 if (a
& CLI_SESS_NOTHROTTLE
)
2989 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2990 throttle_session(s
, 0, 0);
2994 else if (a
& CLI_SESS_THROTTLE
)
2996 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2997 cli_session_actions
[s
].throttle_in
,
2998 cli_session_actions
[s
].throttle_out
);
3000 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3005 if (a
& CLI_SESS_NOFILTER
)
3007 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3008 filter_session(s
, 0, 0);
3012 else if (a
& CLI_SESS_FILTER
)
3014 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3015 cli_session_actions
[s
].filter_in
,
3016 cli_session_actions
[s
].filter_out
);
3018 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3024 cluster_send_session(s
);
3027 // RADIUS interim accounting
3028 if (config
->radius_accounting
&& config
->radius_interim
> 0
3029 && session
[s
].ip
&& !session
[s
].walled_garden
3030 && !sess_local
[s
].radius
// RADIUS already in progress
3031 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
3033 int rad
= radiusnew(s
);
3036 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3037 STAT(radius_overflow
);
3041 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3042 session
[s
].user
, session
[s
].unique_id
);
3044 radiussend(rad
, RADIUSINTERIM
);
3045 sess_local
[s
].last_interim
= time_now
;
3050 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3051 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3055 // Are we in the middle of a tunnel update, or radius
3058 static int still_busy(void)
3061 static clockt last_talked
= 0;
3062 static clockt start_busy_wait
= 0;
3064 if (!config
->cluster_iam_master
)
3067 static time_t stopped_bgp
= 0;
3072 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3074 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3075 if (bgp_peers
[i
].state
== Established
)
3076 bgp_stop(&bgp_peers
[i
]);
3078 stopped_bgp
= time_now
;
3080 // we don't want to become master
3081 cluster_send_ping(0);
3086 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
3094 if (main_quit
== QUIT_SHUTDOWN
)
3096 static int dropped
= 0;
3101 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3102 for (i
= 1; i
< MAXTUNNEL
; i
++)
3103 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3104 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3110 if (start_busy_wait
== 0)
3111 start_busy_wait
= TIME
;
3113 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3115 if (!tunnel
[i
].controlc
)
3118 if (last_talked
!= TIME
)
3120 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
3126 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3127 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3129 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3133 for (i
= 1; i
< MAXRADIUS
; i
++)
3135 if (radius
[i
].state
== RADIUSNULL
)
3137 if (radius
[i
].state
== RADIUSWAIT
)
3140 if (last_talked
!= TIME
)
3142 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
3152 # include <sys/epoll.h>
3154 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3155 # include "fake_epoll.h"
3158 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3161 // additional polled fds
3163 # define EXTRA_FDS BGP_NUM_PEERS
3165 # define EXTRA_FDS 0
3168 // main loop - gets packets on tun or udp and processes them
3169 static void mainloop(void)
3173 clockt next_cluster_ping
= 0; // send initial ping immediately
3174 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3175 int maxevent
= sizeof(events
)/sizeof(*events
);
3177 if ((epollfd
= epoll_create(maxevent
)) < 0)
3179 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3183 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3184 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3186 /* setup our fds to poll for input */
3188 static struct event_data d
[BASE_FDS
];
3189 struct epoll_event e
;
3194 d
[i
].type
= FD_TYPE_CLI
;
3195 e
.data
.ptr
= &d
[i
++];
3196 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3198 d
[i
].type
= FD_TYPE_CLUSTER
;
3199 e
.data
.ptr
= &d
[i
++];
3200 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3202 d
[i
].type
= FD_TYPE_TUN
;
3203 e
.data
.ptr
= &d
[i
++];
3204 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3206 d
[i
].type
= FD_TYPE_UDP
;
3207 e
.data
.ptr
= &d
[i
++];
3208 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3210 d
[i
].type
= FD_TYPE_CONTROL
;
3211 e
.data
.ptr
= &d
[i
++];
3212 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3214 d
[i
].type
= FD_TYPE_DAE
;
3215 e
.data
.ptr
= &d
[i
++];
3216 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3220 signal(SIGPIPE
, SIG_IGN
);
3221 bgp_setup(config
->as_number
);
3222 if (config
->bind_address
)
3223 bgp_add_route(config
->bind_address
, 0xffffffff);
3225 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3227 if (config
->neighbour
[i
].name
[0])
3228 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3229 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3230 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3234 while (!main_quit
|| still_busy())
3244 config
->reload_config
++;
3247 if (config
->reload_config
)
3249 config
->reload_config
= 0;
3257 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3258 STAT(select_called
);
3263 if (errno
== EINTR
||
3264 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3267 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3273 struct sockaddr_in addr
;
3278 int cluster_ready
= 0;
3281 int cluster_pkts
= 0;
3283 uint32_t bgp_events
[BGP_NUM_PEERS
];
3284 memset(bgp_events
, 0, sizeof(bgp_events
));
3287 for (c
= n
, i
= 0; i
< c
; i
++)
3289 struct event_data
*d
= events
[i
].data
.ptr
;
3292 case FD_TYPE_CLI
: // CLI connections
3296 alen
= sizeof(addr
);
3297 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3303 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3309 // these are handled below, with multiple interleaved reads
3310 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3311 case FD_TYPE_TUN
: tun_ready
++; break;
3312 case FD_TYPE_UDP
: udp_ready
++; break;
3314 case FD_TYPE_CONTROL
: // nsctl commands
3315 alen
= sizeof(addr
);
3316 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3320 case FD_TYPE_DAE
: // DAE requests
3321 alen
= sizeof(addr
);
3322 processdae(buf
, recvfrom(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
3326 case FD_TYPE_RADIUS
: // RADIUS response
3327 s
= recv(radfds
[d
->index
], buf
, sizeof(buf
), 0);
3328 if (s
>= 0 && config
->cluster_iam_master
)
3329 processrad(buf
, s
, d
->index
);
3336 bgp_events
[d
->index
] = events
[i
].events
;
3342 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3347 bgp_process(bgp_events
);
3350 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3355 alen
= sizeof(addr
);
3356 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3358 processudp(buf
, s
, &addr
);
3371 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3386 alen
= sizeof(addr
);
3387 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3389 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3400 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3401 STAT(multi_read_used
);
3403 if (c
>= config
->multi_read_count
)
3405 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3406 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3408 STAT(multi_read_exceeded
);
3415 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
3417 // Log current traffic stats
3418 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3419 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3420 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
3421 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
3422 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
3424 udp_tx
= udp_rx
= 0;
3425 udp_rx_pkt
= eth_rx_pkt
= 0;
3426 eth_tx
= eth_rx
= 0;
3429 if (config
->dump_speed
)
3430 printf("%s\n", config
->bandwidth
);
3432 // Update the internal time counter
3433 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3437 struct param_timer p
= { time_now
};
3438 run_plugins(PLUGIN_TIMER
, &p
);
3442 // Runs on every machine (master and slaves).
3443 if (next_cluster_ping
<= TIME
)
3445 // Check to see which of the cluster is still alive..
3447 cluster_send_ping(basetime
); // Only does anything if we're a slave
3448 cluster_check_master(); // ditto.
3450 cluster_heartbeat(); // Only does anything if we're a master.
3451 cluster_check_slaves(); // ditto.
3453 master_update_counts(); // If we're a slave, send our byte counters to our master.
3455 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3456 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3458 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3461 if (!config
->cluster_iam_master
)
3464 // Run token bucket filtering queue..
3465 // Only run it every 1/10th of a second.
3467 static clockt last_run
= 0;
3468 if (last_run
!= TIME
)
3475 // Handle timeouts, retries etc.
3477 static double last_clean
= 0;
3481 TIME
= now(&this_clean
);
3482 diff
= this_clean
- last_clean
;
3484 // Run during idle time (after we've handled
3485 // all incoming packets) or every 1/10th sec
3486 if (!more
|| diff
> 0.1)
3488 regular_cleanups(diff
);
3489 last_clean
= this_clean
;
3493 if (*config
->accounting_dir
)
3495 static clockt next_acct
= 0;
3496 static clockt next_shut_acct
= 0;
3498 if (next_acct
<= TIME
)
3500 // Dump accounting data
3501 next_acct
= TIME
+ ACCT_TIME
;
3502 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3505 else if (next_shut_acct
<= TIME
)
3507 // Dump accounting data for shutdown sessions
3508 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3515 // Are we the master and shutting down??
3516 if (config
->cluster_iam_master
)
3517 cluster_heartbeat(); // Flush any queued changes..
3519 // Ok. Notify everyone we're shutting down. If we're
3520 // the master, this will force an election.
3521 cluster_send_ping(0);
3524 // Important!!! We MUST not process any packets past this point!
3525 LOG(1, 0, 0, "Shutdown complete\n");
3528 static void stripdomain(char *host
)
3532 if ((p
= strchr(host
, '.')))
3538 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3544 while (fgets(buf
, sizeof(buf
), resolv
))
3546 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3549 if (!isspace(buf
[6]))
3553 while (isspace(*b
)) b
++;
3558 while (*b
&& !isspace(*b
)) b
++;
3560 if (buf
[0] == 'd') // domain is canonical
3566 // first search line
3569 // hold, may be subsequent domain line
3570 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3581 int hl
= strlen(host
);
3582 int dl
= strlen(domain
);
3583 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3584 host
[hl
-dl
- 1] = 0;
3588 *p
= 0; // everything after first dot
3593 // Init data structures
3594 static void initdata(int optdebug
, char *optconfig
)
3598 if (!(config
= shared_malloc(sizeof(configt
))))
3600 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3604 memset(config
, 0, sizeof(configt
));
3605 time(&config
->start_time
);
3606 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3607 config
->debug
= optdebug
;
3608 config
->num_tbfs
= MAXTBFS
;
3609 config
->rl_rate
= 28; // 28kbps
3610 config
->cluster_mcast_ttl
= 1;
3611 config
->cluster_master_min_adv
= 1;
3612 config
->ppp_restart_time
= 3;
3613 config
->ppp_max_configure
= 10;
3614 config
->ppp_max_failure
= 5;
3615 strcpy(config
->random_device
, RANDOMDEVICE
);
3617 log_stream
= stderr
;
3620 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3622 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3625 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3628 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3630 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3633 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3635 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3638 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3640 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3644 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3646 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3650 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3652 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3656 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3658 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3662 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3664 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3667 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3669 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3671 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3674 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3676 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3678 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3681 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3683 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3684 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3685 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3686 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3688 // Put all the sessions on the free list marked as undefined.
3689 for (i
= 1; i
< MAXSESSION
; i
++)
3691 session
[i
].next
= i
+ 1;
3692 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3694 session
[MAXSESSION
- 1].next
= 0;
3697 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3698 for (i
= 1; i
< MAXTUNNEL
; i
++)
3699 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3703 // Grab my hostname unless it's been specified
3704 gethostname(hostname
, sizeof(hostname
));
3705 stripdomain(hostname
);
3708 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3711 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3713 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3719 static int assign_ip_address(sessionidt s
)
3723 time_t best_time
= time_now
;
3724 char *u
= session
[s
].user
;
3728 CSTAT(assign_ip_address
);
3730 for (i
= 1; i
< ip_pool_size
; i
++)
3732 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3735 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3742 if (ip_address_pool
[i
].last
< best_time
)
3745 if (!(best_time
= ip_address_pool
[i
].last
))
3746 break; // never used, grab this one
3752 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3756 session
[s
].ip
= ip_address_pool
[best
].address
;
3757 session
[s
].ip_pool_index
= best
;
3758 ip_address_pool
[best
].assigned
= 1;
3759 ip_address_pool
[best
].last
= time_now
;
3760 ip_address_pool
[best
].session
= s
;
3761 if (session
[s
].walled_garden
)
3762 /* Don't track addresses of users in walled garden (note: this
3763 means that their address isn't "sticky" even if they get
3765 ip_address_pool
[best
].user
[0] = 0;
3767 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3770 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3771 reuse
? "Reusing" : "Allocating", best
);
3776 static void free_ip_address(sessionidt s
)
3778 int i
= session
[s
].ip_pool_index
;
3781 CSTAT(free_ip_address
);
3784 return; // what the?
3786 if (i
< 0) // Is this actually part of the ip pool?
3790 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3792 ip_address_pool
[i
].assigned
= 0;
3793 ip_address_pool
[i
].session
= 0;
3794 ip_address_pool
[i
].last
= time_now
;
3798 // Fsck the address pool against the session table.
3799 // Normally only called when we become a master.
3801 // This isn't perfect: We aren't keep tracking of which
3802 // users used to have an IP address.
3804 void rebuild_address_pool(void)
3809 // Zero the IP pool allocation, and build
3810 // a map from IP address to pool index.
3811 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3813 ip_address_pool
[i
].assigned
= 0;
3814 ip_address_pool
[i
].session
= 0;
3815 if (!ip_address_pool
[i
].address
)
3818 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3821 for (i
= 0; i
< MAXSESSION
; ++i
)
3824 if (!(session
[i
].opened
&& session
[i
].ip
))
3827 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3829 if (session
[i
].ip_pool_index
< 0)
3831 // Not allocated out of the pool.
3832 if (ipid
< 1) // Not found in the pool either? good.
3835 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3836 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3838 // Fall through and process it as part of the pool.
3842 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3844 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3846 session
[i
].ip_pool_index
= ipid
;
3850 ip_address_pool
[ipid
].assigned
= 1;
3851 ip_address_pool
[ipid
].session
= i
;
3852 ip_address_pool
[ipid
].last
= time_now
;
3853 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3854 session
[i
].ip_pool_index
= ipid
;
3855 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3860 // Fix the address pool to match a changed session.
3861 // (usually when the master sends us an update).
3862 static void fix_address_pool(int sid
)
3866 ipid
= session
[sid
].ip_pool_index
;
3868 if (ipid
> ip_pool_size
)
3869 return; // Ignore it. rebuild_address_pool will fix it up.
3871 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3872 return; // Just ignore it. rebuild_address_pool will take care of it.
3874 ip_address_pool
[ipid
].assigned
= 1;
3875 ip_address_pool
[ipid
].session
= sid
;
3876 ip_address_pool
[ipid
].last
= time_now
;
3877 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3881 // Add a block of addresses to the IP pool to hand out.
3883 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3887 mask
= 0xffffffff; // Host route only.
3891 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3894 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3896 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3897 continue; // Skip 0 and broadcast addresses.
3899 ip_address_pool
[ip_pool_size
].address
= i
;
3900 ip_address_pool
[ip_pool_size
].assigned
= 0;
3902 if (ip_pool_size
>= MAXIPPOOL
)
3904 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3910 // Initialize the IP address pool
3911 static void initippool()
3916 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3918 if (!(f
= fopen(IPPOOLFILE
, "r")))
3920 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3924 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3927 buf
[4095] = 0; // Force it to be zero terminated/
3929 if (*buf
== '#' || *buf
== '\n')
3930 continue; // Skip comments / blank lines
3931 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3932 if ((p
= (char *)strchr(buf
, ':')))
3936 src
= inet_addr(buf
);
3937 if (src
== INADDR_NONE
)
3939 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3942 // This entry is for a specific IP only
3943 if (src
!= config
->bind_address
)
3948 if ((p
= (char *)strchr(pool
, '/')))
3952 in_addr_t start
= 0, mask
= 0;
3954 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3956 if (!*p
|| !(numbits
= atoi(p
)))
3958 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3961 start
= ntohl(inet_addr(pool
));
3962 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3964 // Add a static route for this pool
3965 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3966 fmtaddr(htonl(start
), 0), 32 + mask
);
3968 routeset(0, start
, mask
, 0, 1);
3970 add_to_ip_pool(start
, mask
);
3974 // It's a single ip address
3975 add_to_ip_pool(inet_addr(pool
), 0);
3979 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3982 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3984 struct sockaddr_in snoop_addr
= {0};
3985 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3988 snoop_addr
.sin_family
= AF_INET
;
3989 snoop_addr
.sin_addr
.s_addr
= destination
;
3990 snoop_addr
.sin_port
= ntohs(port
);
3992 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3993 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3994 htons(snoop_addr
.sin_port
));
3996 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3997 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3999 STAT(packets_snooped
);
4002 static int dump_session(FILE **f
, sessiont
*s
)
4004 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4009 char filename
[1024];
4011 time_t now
= time(NULL
);
4013 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4014 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4016 if (!(*f
= fopen(filename
, "w")))
4018 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
4022 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
4023 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
4028 "# format: username ip qos uptxoctets downrxoctets\n",
4030 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
4035 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
4036 fprintf(*f
, "%s %s %d %u %u\n",
4037 s
->user
, // username
4038 fmtaddr(htonl(s
->ip
), 0), // ip
4039 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
4040 (uint32_t) s
->cin_delta
, // uptxoctets
4041 (uint32_t) s
->cout_delta
); // downrxoctets
4043 s
->cin_delta
= s
->cout_delta
= 0;
4048 static void dump_acct_info(int all
)
4054 CSTAT(dump_acct_info
);
4058 for (i
= 0; i
< shut_acct_n
; i
++)
4059 dump_session(&f
, &shut_acct
[i
]);
4065 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4066 dump_session(&f
, &session
[i
]);
4073 int main(int argc
, char *argv
[])
4077 char *optconfig
= CONFIGFILE
;
4079 time(&basetime
); // start clock
4082 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
4087 if (fork()) exit(0);
4089 freopen("/dev/null", "r", stdin
);
4090 freopen("/dev/null", "w", stdout
);
4091 freopen("/dev/null", "w", stderr
);
4100 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
4103 printf("Args are:\n"
4104 "\t-d\t\tDetach from terminal\n"
4105 "\t-c <file>\tConfig file\n"
4106 "\t-h <hostname>\tForce hostname\n"
4114 // Start the timer routine off
4116 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4119 initdata(optdebug
, optconfig
);
4124 init_tbf(config
->num_tbfs
);
4126 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
4127 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
4128 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4131 rlim
.rlim_cur
= RLIM_INFINITY
;
4132 rlim
.rlim_max
= RLIM_INFINITY
;
4133 // Remove the maximum core size
4134 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
4135 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
4137 // Make core dumps go to /tmp
4141 if (config
->scheduler_fifo
)
4144 struct sched_param params
= {0};
4145 params
.sched_priority
= 1;
4147 if (get_nprocs() < 2)
4149 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4150 config
->scheduler_fifo
= 0;
4154 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4156 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4160 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4161 config
->scheduler_fifo
= 0;
4166 /* Set up the cluster communications port. */
4167 if (cluster_init() < 0)
4171 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4179 unsigned seed
= time_now
^ getpid();
4180 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4184 signal(SIGHUP
, sighup_handler
);
4185 signal(SIGCHLD
, sigchild_handler
);
4186 signal(SIGTERM
, shutdown_handler
);
4187 signal(SIGINT
, shutdown_handler
);
4188 signal(SIGQUIT
, shutdown_handler
);
4190 // Prevent us from getting paged out
4191 if (config
->lock_pages
)
4193 if (!mlockall(MCL_CURRENT
))
4194 LOG(1, 0, 0, "Locking pages into memory\n");
4196 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4199 // Drop privileges here
4200 if (config
->target_uid
> 0 && geteuid() == 0)
4201 setuid(config
->target_uid
);
4205 /* remove plugins (so cleanup code gets run) */
4208 // Remove the PID file if we wrote it
4209 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4210 unlink(config
->pid_file
);
4212 /* kill CLI children */
4213 signal(SIGTERM
, SIG_IGN
);
4218 static void sighup_handler(int sig
)
4223 static void shutdown_handler(int sig
)
4225 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4228 static void sigchild_handler(int sig
)
4230 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4234 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4237 *challenge_response
= NULL
;
4239 if (!*config
->l2tp_secret
)
4241 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4245 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4247 *challenge_response
= calloc(17, 1);
4250 MD5_Update(&ctx
, &id
, 1);
4251 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
4252 MD5_Update(&ctx
, challenge
, challenge_length
);
4253 MD5_Final(*challenge_response
, &ctx
);
4258 static int facility_value(char *name
)
4261 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4263 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4264 return facilitynames
[i
].c_val
;
4269 static void update_config()
4273 static int timeout
= 0;
4274 static int interval
= 0;
4281 if (log_stream
!= stderr
)
4287 if (*config
->log_filename
)
4289 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4291 char *p
= config
->log_filename
+ 7;
4294 openlog("l2tpns", LOG_PID
, facility_value(p
));
4298 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4300 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4302 fseek(log_stream
, 0, SEEK_END
);
4303 setbuf(log_stream
, NULL
);
4307 log_stream
= stderr
;
4308 setbuf(log_stream
, NULL
);
4314 log_stream
= stderr
;
4315 setbuf(log_stream
, NULL
);
4318 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4319 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4321 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= PPPMTU
;
4322 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
4323 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
4325 // reset MRU/MSS globals
4326 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
4327 MSS
= MRU
- TCP_HDRS
;
4330 config
->numradiusservers
= 0;
4331 for (i
= 0; i
< MAXRADSERVER
; i
++)
4332 if (config
->radiusserver
[i
])
4334 config
->numradiusservers
++;
4335 // Set radius port: if not set, take the port from the
4336 // first radius server. For the first radius server,
4337 // take the #defined default value from l2tpns.h
4339 // test twice, In case someone works with
4340 // a secondary radius server without defining
4341 // a primary one, this will work even then.
4342 if (i
> 0 && !config
->radiusport
[i
])
4343 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4344 if (!config
->radiusport
[i
])
4345 config
->radiusport
[i
] = RADPORT
;
4348 if (!config
->numradiusservers
)
4349 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4351 // parse radius_authtypes_s
4352 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4353 p
= config
->radius_authtypes_s
;
4356 char *s
= strpbrk(p
, " \t,");
4362 while (*s
== ' ' || *s
== '\t')
4369 if (!strncasecmp("chap", p
, strlen(p
)))
4371 else if (!strncasecmp("pap", p
, strlen(p
)))
4374 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4376 config
->radius_authtypes
|= type
;
4377 if (!config
->radius_authprefer
)
4378 config
->radius_authprefer
= type
;
4383 if (!config
->radius_authtypes
)
4385 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4386 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4389 // normalise radius_authtypes_s
4390 if (config
->radius_authprefer
== AUTHPAP
)
4392 strcpy(config
->radius_authtypes_s
, "pap");
4393 if (config
->radius_authtypes
& AUTHCHAP
)
4394 strcat(config
->radius_authtypes_s
, ", chap");
4398 strcpy(config
->radius_authtypes_s
, "chap");
4399 if (config
->radius_authtypes
& AUTHPAP
)
4400 strcat(config
->radius_authtypes_s
, ", pap");
4403 if (!config
->radius_dae_port
)
4404 config
->radius_dae_port
= DAEPORT
;
4406 // re-initialise the random number source
4407 initrandom(config
->random_device
);
4410 for (i
= 0; i
< MAXPLUGINS
; i
++)
4412 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4415 if (*config
->plugins
[i
])
4418 add_plugin(config
->plugins
[i
]);
4420 else if (*config
->old_plugins
[i
])
4423 remove_plugin(config
->old_plugins
[i
]);
4427 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4428 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4429 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4430 if (!*config
->cluster_interface
)
4431 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4433 if (!config
->cluster_hb_interval
)
4434 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4436 if (!config
->cluster_hb_timeout
)
4437 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4439 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4441 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4442 // late, ensure we're sufficiently larger than that
4443 int t
= 4 * config
->cluster_hb_interval
+ 11;
4445 if (config
->cluster_hb_timeout
< t
)
4447 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4448 config
->cluster_hb_timeout
= t
;
4451 // Push timing changes to the slaves immediately if we're the master
4452 if (config
->cluster_iam_master
)
4453 cluster_heartbeat();
4455 interval
= config
->cluster_hb_interval
;
4456 timeout
= config
->cluster_hb_timeout
;
4460 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4463 if ((f
= fopen(config
->pid_file
, "w")))
4465 fprintf(f
, "%d\n", getpid());
4467 config
->wrote_pid
= 1;
4471 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4476 static void read_config_file()
4480 if (!config
->config_file
) return;
4481 if (!(f
= fopen(config
->config_file
, "r")))
4483 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4487 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4489 LOG(3, 0, 0, "Done reading config file\n");
4493 int sessionsetup(sessionidt s
, tunnelidt t
)
4495 // A session now exists, set it up
4501 CSTAT(sessionsetup
);
4503 LOG(3, s
, t
, "Doing session setup for session\n");
4507 assign_ip_address(s
);
4510 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4511 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4514 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4515 fmtaddr(htonl(session
[s
].ip
), 0));
4519 // Make sure this is right
4520 session
[s
].tunnel
= t
;
4522 // zap old sessions with same IP and/or username
4523 // Don't kill gardened sessions - doing so leads to a DoS
4524 // from someone who doesn't need to know the password
4527 user
= session
[s
].user
;
4528 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4530 if (i
== s
) continue;
4531 if (!session
[s
].opened
) continue;
4532 if (ip
== session
[i
].ip
)
4534 sessionkill(i
, "Duplicate IP address");
4538 if (config
->allow_duplicate_users
) continue;
4539 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4540 if (!strcasecmp(user
, session
[i
].user
))
4541 sessionkill(i
, "Duplicate session for users");
4548 // Add the route for this session.
4549 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4551 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4552 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4555 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4558 // Static IPs need to be routed if not already
4559 // convered by a Framed-Route. Anything else is part
4560 // of the IP address pool and is already routed, it
4561 // just needs to be added to the IP cache.
4562 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4563 if (session
[s
].ip_pool_index
== -1) // static ip
4565 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4568 cache_ipmap(session
[s
].ip
, s
);
4571 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
4572 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
4574 // Run the plugin's against this new session.
4576 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4577 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4580 // Allocate TBFs if throttled
4581 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4582 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4584 session
[s
].last_packet
= time_now
;
4586 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4587 fmtaddr(htonl(session
[s
].ip
), 0),
4588 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4590 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4592 return 1; // RADIUS OK and IP allocated, done...
4596 // This session just got dropped on us by the master or something.
4597 // Make sure our tables up up to date...
4599 int load_session(sessionidt s
, sessiont
*new)
4605 if (new->ip_pool_index
>= MAXIPPOOL
||
4606 new->tunnel
>= MAXTUNNEL
)
4608 LOG(0, s
, 0, "Strange session update received!\n");
4609 // FIXME! What to do here?
4614 // Ok. All sanity checks passed. Now we're committed to
4615 // loading the new session.
4618 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4620 // See if routes/ip cache need updating
4621 if (new->ip
!= session
[s
].ip
)
4624 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4625 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4626 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4634 // remove old routes...
4635 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4637 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4638 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4641 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4647 if (session
[s
].ip_pool_index
== -1) // static IP
4649 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4651 else // It's part of the IP pool, remove it manually.
4652 uncache_ipmap(session
[s
].ip
);
4657 // add new routes...
4658 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4660 if ((new->ip
& new->route
[i
].mask
) ==
4661 (new->route
[i
].ip
& new->route
[i
].mask
))
4664 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4670 // If there's a new one, add it.
4671 if (new->ip_pool_index
== -1)
4673 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4676 cache_ipmap(new->ip
, s
);
4681 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
4682 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4685 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4687 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4691 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4693 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4694 new->filter_out
= 0;
4697 if (new->filter_in
!= session
[s
].filter_in
)
4699 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4700 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4703 if (new->filter_out
!= session
[s
].filter_out
)
4705 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4706 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4709 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4710 // for walking the sessions to forward byte counts to the master.
4711 config
->cluster_highest_sessionid
= s
;
4713 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4715 // Do fixups into address pool.
4716 if (new->ip_pool_index
!= -1)
4717 fix_address_pool(s
);
4722 static void initplugins()
4726 loaded_plugins
= ll_init();
4727 // Initialize the plugins to nothing
4728 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4729 plugins
[i
] = ll_init();
4732 static void *open_plugin(char *plugin_name
, int load
)
4734 char path
[256] = "";
4736 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4737 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4738 return dlopen(path
, RTLD_NOW
);
4741 // plugin callback to get a config value
4742 static void *getconfig(char *key
, enum config_typet type
)
4746 for (i
= 0; config_values
[i
].key
; i
++)
4748 if (!strcmp(config_values
[i
].key
, key
))
4750 if (config_values
[i
].type
== type
)
4751 return ((void *) config
) + config_values
[i
].offset
;
4753 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4754 key
, type
, config_values
[i
].type
);
4760 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4764 static int add_plugin(char *plugin_name
)
4766 static struct pluginfuncs funcs
= {
4771 sessiontbysessionidt
,
4772 sessionidtbysessiont
,
4779 cluster_send_session
,
4782 void *p
= open_plugin(plugin_name
, 1);
4783 int (*initfunc
)(struct pluginfuncs
*);
4788 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4792 if (ll_contains(loaded_plugins
, p
))
4795 return 0; // already loaded
4799 int *v
= dlsym(p
, "plugin_api_version");
4800 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4802 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4808 if ((initfunc
= dlsym(p
, "plugin_init")))
4810 if (!initfunc(&funcs
))
4812 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4818 ll_push(loaded_plugins
, p
);
4820 for (i
= 0; i
< max_plugin_functions
; i
++)
4823 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4825 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4826 ll_push(plugins
[i
], x
);
4830 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4834 static void run_plugin_done(void *plugin
)
4836 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4842 static int remove_plugin(char *plugin_name
)
4844 void *p
= open_plugin(plugin_name
, 0);
4850 if (ll_contains(loaded_plugins
, p
))
4853 for (i
= 0; i
< max_plugin_functions
; i
++)
4856 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4857 ll_delete(plugins
[i
], x
);
4860 ll_delete(loaded_plugins
, p
);
4866 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4870 int run_plugins(int plugin_type
, void *data
)
4872 int (*func
)(void *data
);
4874 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4875 return PLUGIN_RET_ERROR
;
4877 ll_reset(plugins
[plugin_type
]);
4878 while ((func
= ll_next(plugins
[plugin_type
])))
4882 if (r
!= PLUGIN_RET_OK
)
4883 return r
; // stop here
4886 return PLUGIN_RET_OK
;
4889 static void plugins_done()
4893 ll_reset(loaded_plugins
);
4894 while ((p
= ll_next(loaded_plugins
)))
4898 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4900 struct nsctl request
;
4901 struct nsctl response
;
4902 int type
= unpack_control(&request
, buf
, len
);
4906 if (log_stream
&& config
->debug
>= 4)
4910 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4911 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4915 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4916 dump_control(&request
, log_stream
);
4922 case NSCTL_REQ_LOAD
:
4923 if (request
.argc
!= 1)
4925 response
.type
= NSCTL_RES_ERR
;
4927 response
.argv
[0] = "name of plugin required";
4929 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4931 response
.type
= NSCTL_RES_ERR
;
4933 response
.argv
[0] = !r
4934 ? "plugin already loaded"
4935 : "error loading plugin";
4939 response
.type
= NSCTL_RES_OK
;
4945 case NSCTL_REQ_UNLOAD
:
4946 if (request
.argc
!= 1)
4948 response
.type
= NSCTL_RES_ERR
;
4950 response
.argv
[0] = "name of plugin required";
4952 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4954 response
.type
= NSCTL_RES_ERR
;
4956 response
.argv
[0] = !r
4957 ? "plugin not loaded"
4958 : "plugin not found";
4962 response
.type
= NSCTL_RES_OK
;
4968 case NSCTL_REQ_HELP
:
4969 response
.type
= NSCTL_RES_OK
;
4972 ll_reset(loaded_plugins
);
4973 while ((p
= ll_next(loaded_plugins
)))
4975 char **help
= dlsym(p
, "plugin_control_help");
4976 while (response
.argc
< 0xff && help
&& *help
)
4977 response
.argv
[response
.argc
++] = *help
++;
4982 case NSCTL_REQ_CONTROL
:
4984 struct param_control param
= {
4985 config
->cluster_iam_master
,
4992 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4994 if (r
== PLUGIN_RET_ERROR
)
4996 response
.type
= NSCTL_RES_ERR
;
4998 response
.argv
[0] = param
.additional
5000 : "error returned by plugin";
5002 else if (r
== PLUGIN_RET_NOTMASTER
)
5004 static char msg
[] = "must be run on master: 000.000.000.000";
5006 response
.type
= NSCTL_RES_ERR
;
5008 if (config
->cluster_master_address
)
5010 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
5011 response
.argv
[0] = msg
;
5015 response
.argv
[0] = "must be run on master: none elected";
5018 else if (!(param
.response
& NSCTL_RESPONSE
))
5020 response
.type
= NSCTL_RES_ERR
;
5022 response
.argv
[0] = param
.response
5023 ? "unrecognised response value from plugin"
5024 : "unhandled action";
5028 response
.type
= param
.response
;
5030 if (param
.additional
)
5033 response
.argv
[0] = param
.additional
;
5041 response
.type
= NSCTL_RES_ERR
;
5043 response
.argv
[0] = "error unpacking control packet";
5046 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
5049 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5053 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
5056 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
5057 if (log_stream
&& config
->debug
>= 4)
5059 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5060 dump_control(&response
, log_stream
);
5064 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5065 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
5070 static tunnelidt
new_tunnel()
5073 for (i
= 1; i
< MAXTUNNEL
; i
++)
5075 if (tunnel
[i
].state
== TUNNELFREE
)
5077 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
5078 if (i
> config
->cluster_highest_tunnelid
)
5079 config
->cluster_highest_tunnelid
= i
;
5083 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5088 // We're becoming the master. Do any required setup..
5090 // This is principally telling all the plugins that we're
5091 // now a master, and telling them about all the sessions
5092 // that are active too..
5094 void become_master(void)
5097 static struct event_data d
[RADIUS_FDS
];
5098 struct epoll_event e
;
5100 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
5102 // running a bunch of iptables commands is slow and can cause
5103 // the master to drop tunnels on takeover--kludge around the
5104 // problem by forking for the moment (note: race)
5105 if (!fork_and_close())
5107 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5109 if (!session
[s
].opened
) // Not an in-use session.
5112 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5119 for (i
= 0; i
< RADIUS_FDS
; i
++)
5121 d
[i
].type
= FD_TYPE_RADIUS
;
5125 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5129 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5135 if (CLI_HELP_REQUESTED
)
5136 return CLI_HELP_NO_ARGS
;
5139 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5141 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5144 if (!session
[s
].opened
)
5147 idle
= time_now
- session
[s
].last_packet
;
5148 idle
/= 5 ; // In multiples of 5 seconds.
5158 for (i
= 0; i
< 63; ++i
)
5160 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5162 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5163 cli_print(cli
, "%d total sessions open.", count
);
5167 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5173 if (CLI_HELP_REQUESTED
)
5174 return CLI_HELP_NO_ARGS
;
5177 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5179 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5182 if (!session
[s
].opened
)
5185 d
= time_now
- session
[s
].opened
;
5188 while (d
> 1 && open
< 32)
5198 for (i
= 0; i
< 30; ++i
)
5200 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5203 cli_print(cli
, "%d total sessions open.", count
);
5209 * This unencodes the AVP using the L2TP secret and the previously
5210 * stored random vector. It overwrites the hidden data with the
5211 * unhidden AVP subformat.
5213 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5219 uint16_t m
= htons(type
);
5221 // Compute initial pad
5223 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5224 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5225 MD5_Update(&ctx
, vector
, vec_len
);
5226 MD5_Final(digest
, &ctx
);
5228 // pointer to last decoded 16 octets
5233 // calculate a new pad based on the last decoded block
5234 if (d
>= sizeof(digest
))
5237 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5238 MD5_Update(&ctx
, last
, sizeof(digest
));
5239 MD5_Final(digest
, &ctx
);
5245 *value
++ ^= digest
[d
++];
5250 int find_filter(char const *name
, size_t len
)
5255 for (i
= 0; i
< MAXFILTER
; i
++)
5257 if (!*ip_filters
[i
].name
)
5265 if (strlen(ip_filters
[i
].name
) != len
)
5268 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5275 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5279 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5280 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5281 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5282 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5283 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5289 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5293 case FILTER_FLAG_OP_ANY
:
5294 return (flags
& sflags
) || (~flags
& cflags
);
5296 case FILTER_FLAG_OP_ALL
:
5297 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5299 case FILTER_FLAG_OP_EST
:
5300 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5306 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5308 uint16_t frag_offset
;
5312 uint16_t src_port
= 0;
5313 uint16_t dst_port
= 0;
5315 ip_filter_rulet
*rule
;
5317 if (len
< 20) // up to end of destination address
5320 if ((*buf
>> 4) != 4) // IPv4
5323 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5325 src_ip
= *(in_addr_t
*) (buf
+ 12);
5326 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5328 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5330 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5331 if (len
< l
+ 4) // ports
5334 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5335 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5336 if (proto
== IPPROTO_TCP
)
5338 if (len
< l
+ 14) // flags
5341 flags
= buf
[l
+ 13] & 0x3f;
5345 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5347 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5350 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5351 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5354 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5355 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5360 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5368 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5370 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5373 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5376 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5377 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5384 return rule
->action
== FILTER_ACTION_PERMIT
;