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 1.157 2006-04-05 01:45:57 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 static int time_changed
= 0; // time_now changed
100 char main_quit
= 0; // True if we're in the process of exiting.
101 static 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
, struct in_addr
*local
);
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 /* set MTU to modem MRU */
559 if (ioctl(ifrfd
, SIOCSIFMTU
, (void *) &ifr
) < 0)
561 LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno
));
564 ifr
.ifr_flags
= IFF_UP
;
565 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
567 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
570 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
572 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
575 tunidx
= ifr
.ifr_ifindex
;
577 // Only setup IPv6 on the tun device if we have a configured prefix
578 if (config
->ipv6_prefix
.s6_addr
[0]) {
579 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
581 // Link local address is FE80::1
582 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
583 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
584 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
585 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
586 ifr6
.ifr6_prefixlen
= 64;
587 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
588 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
590 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
591 " %s\n", strerror(errno
));
594 // Global address is prefix::1
595 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
596 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
597 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
598 ifr6
.ifr6_prefixlen
= 64;
599 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
600 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
602 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
609 static void initudp(void)
612 struct sockaddr_in addr
;
615 memset(&addr
, 0, sizeof(addr
));
616 addr
.sin_family
= AF_INET
;
617 addr
.sin_port
= htons(L2TPPORT
);
618 addr
.sin_addr
.s_addr
= config
->bind_address
;
619 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
620 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
622 int flags
= fcntl(udpfd
, F_GETFL
, 0);
623 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
625 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
627 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
632 memset(&addr
, 0, sizeof(addr
));
633 addr
.sin_family
= AF_INET
;
634 addr
.sin_port
= htons(NSCTL_PORT
);
635 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
636 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
637 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
639 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
643 // Dynamic Authorization Extensions to RADIUS
644 memset(&addr
, 0, sizeof(addr
));
645 addr
.sin_family
= AF_INET
;
646 addr
.sin_port
= htons(config
->radius_dae_port
);
647 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
648 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
649 if (bind(daefd
, (void *) &addr
, sizeof(addr
)) < 0)
651 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
656 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
660 // Find session by IP, < 1 for not found
662 // Confusingly enough, this 'ip' must be
663 // in _network_ order. This being the common
664 // case when looking it up from IP packet headers.
666 // We actually use this cache for two things.
667 // #1. For used IP addresses, this maps to the
668 // session ID that it's used by.
669 // #2. For un-used IP addresses, this maps to the
670 // index into the pool table that contains that
674 static int lookup_ipmap(in_addr_t ip
)
676 uint8_t *a
= (uint8_t *) &ip
;
677 uint8_t **d
= (uint8_t **) ip_hash
;
679 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
680 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
681 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
683 return (int) (intptr_t) d
[(size_t) *a
];
686 static int lookup_ipv6map(struct in6_addr ip
)
688 struct ipv6radix
*curnode
;
691 char ipv6addr
[INET6_ADDRSTRLEN
];
693 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
697 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
699 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
704 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
705 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
712 sessionidt
sessionbyip(in_addr_t ip
)
714 int s
= lookup_ipmap(ip
);
717 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
718 return (sessionidt
) s
;
723 sessionidt
sessionbyipv6(struct in6_addr ip
)
726 CSTAT(sessionbyipv6
);
728 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
729 (ip
.s6_addr
[0] == 0xFE &&
730 ip
.s6_addr
[1] == 0x80 &&
731 ip
.s6_addr16
[1] == 0 &&
732 ip
.s6_addr16
[2] == 0 &&
733 ip
.s6_addr16
[3] == 0)) {
734 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
736 s
= lookup_ipv6map(ip
);
739 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
746 // Take an IP address in HOST byte order and
747 // add it to the sessionid by IP cache.
749 // (It's actually cached in network order)
751 static void cache_ipmap(in_addr_t ip
, int s
)
753 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
754 uint8_t *a
= (uint8_t *) &nip
;
755 uint8_t **d
= (uint8_t **) ip_hash
;
758 for (i
= 0; i
< 3; i
++)
760 if (!d
[(size_t) a
[i
]])
762 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
766 d
= (uint8_t **) d
[(size_t) a
[i
]];
769 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
772 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
775 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
776 // else a map to an ip pool index.
779 static void uncache_ipmap(in_addr_t ip
)
781 cache_ipmap(ip
, 0); // Assign it to the NULL session.
784 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
788 struct ipv6radix
*curnode
;
789 char ipv6addr
[INET6_ADDRSTRLEN
];
791 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
793 bytes
= prefixlen
>> 3;
796 if (curnode
->branch
== NULL
)
798 if (!(curnode
->branch
= calloc(256,
799 sizeof (struct ipv6radix
))))
802 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
809 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
810 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
814 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
815 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
821 // CLI list to dump current ipcache.
823 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
825 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
829 if (CLI_HELP_REQUESTED
)
830 return CLI_HELP_NO_ARGS
;
832 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
834 for (i
= 0; i
< 256; ++i
)
839 for (j
= 0; j
< 256; ++j
)
844 for (k
= 0; k
< 256; ++k
)
849 for (l
= 0; l
< 256; ++l
)
853 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
859 cli_print(cli
, "%d entries in cache", count
);
864 // Find session by username, 0 for not found
865 // walled garden users aren't authenticated, so the username is
866 // reasonably useless. Ignore them to avoid incorrect actions
868 // This is VERY inefficent. Don't call it often. :)
870 sessionidt
sessionbyuser(char *username
)
873 CSTAT(sessionbyuser
);
875 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
877 if (!session
[s
].opened
)
880 if (session
[s
].walled_garden
)
881 continue; // Skip walled garden users.
883 if (!strncmp(session
[s
].user
, username
, 128))
887 return 0; // Not found.
890 void send_garp(in_addr_t ip
)
896 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
899 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
902 memset(&ifr
, 0, sizeof(ifr
));
903 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
904 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
906 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
910 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
911 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
913 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
918 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
921 static sessiont
*sessiontbysessionidt(sessionidt s
)
923 if (!s
|| s
>= MAXSESSION
) return NULL
;
927 static sessionidt
sessionidtbysessiont(sessiont
*s
)
929 sessionidt val
= s
-session
;
930 if (s
< session
|| val
>= MAXSESSION
) return 0;
934 // actually send a control message for a specific tunnel
935 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
937 struct sockaddr_in addr
;
943 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
944 STAT(tunnel_tx_errors
);
950 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
951 STAT(tunnel_tx_errors
);
955 memset(&addr
, 0, sizeof(addr
));
956 addr
.sin_family
= AF_INET
;
957 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
958 addr
.sin_port
= htons(tunnel
[t
].port
);
960 // sequence expected, if sequence in message
961 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
963 // If this is a control message, deal with retries
966 tunnel
[t
].last
= time_now
; // control message sent
967 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
970 STAT(tunnel_retries
);
971 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
975 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
977 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
978 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
979 STAT(tunnel_tx_errors
);
983 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
984 STAT(tunnel_tx_packets
);
985 INC_STAT(tunnel_tx_bytes
, l
);
989 // Tiny helper function to write data to
992 int tun_write(uint8_t * data
, int size
)
994 return write(tunfd
, data
, size
);
997 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
998 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1000 int d
= (tcp
[12] >> 4) * 4;
1007 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1010 if (tcp
+ d
> buf
+ len
) // short?
1018 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1021 if (mss
+ 2 > data
) return; // short?
1025 if (*opts
== 0) return; // end of options
1026 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1029 opts
+= opts
[1]; // skip over option
1032 if (!mss
) return; // not found
1033 orig
= ntohs(*(uint16_t *) mss
);
1035 if (orig
<= MSS
) return; // mss OK
1037 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1038 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1039 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1040 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1043 *(int16_t *) mss
= htons(MSS
);
1045 // adjust checksum (see rfc1141)
1046 sum
= orig
+ (~MSS
& 0xffff);
1047 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1048 sum
= (sum
& 0xffff) + (sum
>> 16);
1049 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1052 // process outgoing (to tunnel) IP
1054 static void processipout(uint8_t *buf
, int len
)
1061 uint8_t *data
= buf
; // Keep a copy of the originals.
1064 uint8_t b
[MAXETHER
+ 20];
1066 CSTAT(processipout
);
1068 if (len
< MIN_IP_SIZE
)
1070 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1071 STAT(tun_rx_errors
);
1074 if (len
>= MAXETHER
)
1076 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1077 STAT(tun_rx_errors
);
1081 // Skip the tun header
1085 // Got an IP header now
1086 if (*(uint8_t *)(buf
) >> 4 != 4)
1088 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1092 ip
= *(uint32_t *)(buf
+ 16);
1093 if (!(s
= sessionbyip(ip
)))
1095 // Is this a packet for a session that doesn't exist?
1096 static int rate
= 0; // Number of ICMP packets we've sent this second.
1097 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1099 if (last
!= time_now
)
1105 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1107 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1108 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1109 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1113 t
= session
[s
].tunnel
;
1116 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1117 if (config
->max_packets
> 0)
1119 if (sess_local
[s
].last_packet_out
== TIME
)
1121 int max
= config
->max_packets
;
1123 // All packets for throttled sessions are handled by the
1124 // master, so further limit by using the throttle rate.
1125 // A bit of a kludge, since throttle rate is in kbps,
1126 // but should still be generous given our average DSL
1127 // packet size is 200 bytes: a limit of 28kbps equates
1128 // to around 180 packets per second.
1129 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1130 max
= sp
->throttle_out
;
1132 if (++sess_local
[s
].packets_out
> max
)
1134 sess_local
[s
].packets_dropped
++;
1140 if (sess_local
[s
].packets_dropped
)
1142 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1143 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1144 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1145 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1149 sess_local
[s
].last_packet_out
= TIME
;
1150 sess_local
[s
].packets_out
= 1;
1151 sess_local
[s
].packets_dropped
= 0;
1155 // run access-list if any
1156 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1159 // adjust MSS on SYN and SYN,ACK packets with options
1160 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1162 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1163 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1164 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1169 // Are we throttling this session?
1170 if (config
->cluster_iam_master
)
1171 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1173 master_throttle_packet(sp
->tbf_out
, data
, size
);
1177 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1179 // We are walled-gardening this
1180 master_garden_packet(s
, data
, size
);
1184 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1186 // Add on L2TP header
1188 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
);
1190 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1193 // Snooping this session, send it to intercept box
1194 if (sp
->snoop_ip
&& sp
->snoop_port
)
1195 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1197 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1198 sp
->cout_delta
+= len
;
1202 sess_local
[s
].cout
+= len
; // To send to master..
1203 sess_local
[s
].pout
++;
1206 // process outgoing (to tunnel) IPv6
1208 static void processipv6out(uint8_t * buf
, int len
)
1214 struct in6_addr ip6
;
1216 uint8_t *data
= buf
; // Keep a copy of the originals.
1219 uint8_t b
[MAXETHER
+ 20];
1221 CSTAT(processipv6out
);
1223 if (len
< MIN_IP_SIZE
)
1225 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1226 STAT(tunnel_tx_errors
);
1229 if (len
>= MAXETHER
)
1231 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1232 STAT(tunnel_tx_errors
);
1236 // Skip the tun header
1240 // Got an IP header now
1241 if (*(uint8_t *)(buf
) >> 4 != 6)
1243 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1247 ip6
= *(struct in6_addr
*)(buf
+24);
1248 s
= sessionbyipv6(ip6
);
1252 ip
= *(uint32_t *)(buf
+ 32);
1253 s
= sessionbyip(ip
);
1258 // Is this a packet for a session that doesn't exist?
1259 static int rate
= 0; // Number of ICMP packets we've sent this second.
1260 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1262 if (last
!= time_now
)
1268 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1270 // FIXME: Should send icmp6 host unreachable
1274 t
= session
[s
].tunnel
;
1277 // FIXME: add DoS prevention/filters?
1281 // Are we throttling this session?
1282 if (config
->cluster_iam_master
)
1283 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1285 master_throttle_packet(sp
->tbf_out
, data
, size
);
1288 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1290 // We are walled-gardening this
1291 master_garden_packet(s
, data
, size
);
1295 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1297 // Add on L2TP header
1299 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
);
1301 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1304 // Snooping this session, send it to intercept box
1305 if (sp
->snoop_ip
&& sp
->snoop_port
)
1306 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1308 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1309 sp
->cout_delta
+= len
;
1313 sess_local
[s
].cout
+= len
; // To send to master..
1314 sess_local
[s
].pout
++;
1318 // Helper routine for the TBF filters.
1319 // Used to send queued data in to the user!
1321 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1327 uint8_t b
[MAXETHER
+ 20];
1329 if (len
< 0 || len
> MAXETHER
)
1331 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1335 // Skip the tun header
1339 ip
= *(in_addr_t
*)(buf
+ 16);
1344 t
= session
[s
].tunnel
;
1347 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1349 // Add on L2TP header
1351 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
);
1353 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1356 // Snooping this session.
1357 if (sp
->snoop_ip
&& sp
->snoop_port
)
1358 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1360 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1361 sp
->cout_delta
+= len
;
1365 sess_local
[s
].cout
+= len
; // To send to master..
1366 sess_local
[s
].pout
++;
1369 // add an AVP (16 bit)
1370 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1372 uint16_t l
= (m
? 0x8008 : 0x0008);
1373 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1374 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1375 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1376 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1380 // add an AVP (32 bit)
1381 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1383 uint16_t l
= (m
? 0x800A : 0x000A);
1384 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1385 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1386 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1387 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1391 // add an AVP (string)
1392 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1394 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1395 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1396 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1397 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1398 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1399 c
->length
+= 6 + strlen(val
);
1403 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1405 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1406 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1407 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1408 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1409 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1410 c
->length
+= 6 + len
;
1413 // new control connection
1414 static controlt
*controlnew(uint16_t mtype
)
1418 c
= malloc(sizeof(controlt
));
1422 controlfree
= c
->next
;
1426 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1428 control16(c
, 0, mtype
, 1);
1432 // send zero block if nothing is waiting
1434 static void controlnull(tunnelidt t
)
1437 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1440 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1441 *(uint16_t *) (buf
+ 2) = htons(12); // length
1442 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1443 *(uint16_t *) (buf
+ 6) = htons(0); // session
1444 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1445 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1446 tunnelsend(buf
, 12, t
);
1449 // add a control message to a tunnel, and send if within window
1450 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1452 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1453 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1454 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1455 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1456 tunnel
[t
].ns
++; // advance sequence
1457 // link in message in to queue
1458 if (tunnel
[t
].controlc
)
1459 tunnel
[t
].controle
->next
= c
;
1461 tunnel
[t
].controls
= c
;
1463 tunnel
[t
].controle
= c
;
1464 tunnel
[t
].controlc
++;
1466 // send now if space in window
1467 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1469 tunnel
[t
].try = 0; // first send
1470 tunnelsend(c
->buf
, c
->length
, t
);
1475 // Throttle or Unthrottle a session
1477 // Throttle the data from/to through a session to no more than
1478 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1481 // If either value is -1, the current value is retained for that
1484 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1486 if (!session
[s
].opened
)
1487 return; // No-one home.
1489 if (!*session
[s
].user
)
1490 return; // User not logged in
1494 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1495 if (session
[s
].tbf_in
)
1496 free_tbf(session
[s
].tbf_in
);
1499 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1501 session
[s
].tbf_in
= 0;
1503 session
[s
].throttle_in
= rate_in
;
1508 int bytes
= rate_out
* 1024 / 8;
1509 if (session
[s
].tbf_out
)
1510 free_tbf(session
[s
].tbf_out
);
1513 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1515 session
[s
].tbf_out
= 0;
1517 session
[s
].throttle_out
= rate_out
;
1521 // add/remove filters from session (-1 = no change)
1522 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1524 if (!session
[s
].opened
)
1525 return; // No-one home.
1527 if (!*session
[s
].user
)
1528 return; // User not logged in
1531 if (filter_in
> MAXFILTER
) filter_in
= -1;
1532 if (filter_out
> MAXFILTER
) filter_out
= -1;
1533 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1534 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1538 if (session
[s
].filter_in
)
1539 ip_filters
[session
[s
].filter_in
- 1].used
--;
1542 ip_filters
[filter_in
- 1].used
++;
1544 session
[s
].filter_in
= filter_in
;
1547 if (filter_out
>= 0)
1549 if (session
[s
].filter_out
)
1550 ip_filters
[session
[s
].filter_out
- 1].used
--;
1553 ip_filters
[filter_out
- 1].used
++;
1555 session
[s
].filter_out
= filter_out
;
1559 // start tidy shutdown of session
1560 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1562 int walled_garden
= session
[s
].walled_garden
;
1565 CSTAT(sessionshutdown
);
1567 if (!session
[s
].opened
)
1569 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1570 return; // not a live session
1573 if (!session
[s
].die
)
1575 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1576 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1577 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1580 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1582 // RADIUS Stop message
1583 uint16_t r
= radiusnew(s
);
1586 // stop, if not already trying
1587 if (radius
[r
].state
!= RADIUSSTOP
)
1588 radiussend(r
, RADIUSSTOP
);
1591 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1593 // Save counters to dump to accounting file
1594 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1595 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1599 { // IP allocated, clear and unroute
1602 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1604 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1605 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1608 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1609 session
[s
].route
[r
].ip
= 0;
1612 if (session
[s
].ip_pool_index
== -1) // static ip
1614 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1620 // unroute IPv6, if setup
1621 if (session
[s
].ppp
.ipv6cp
== Opened
&& session
[s
].ipv6prefixlen
)
1622 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1625 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1626 throttle_session(s
, 0, 0);
1630 controlt
*c
= controlnew(14); // sending CDN
1634 *(uint16_t *) buf
= htons(result
);
1635 *(uint16_t *) (buf
+2) = htons(error
);
1636 controlb(c
, 1, buf
, 4, 1);
1639 control16(c
, 1, result
, 1);
1641 control16(c
, 14, s
, 1); // assigned session (our end)
1642 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
1645 if (!session
[s
].die
)
1646 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1648 // update filter refcounts
1649 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1650 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1653 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
1654 sess_local
[s
].lcp
.restart
= 0;
1655 sess_local
[s
].ipcp
.restart
= 0;
1656 sess_local
[s
].ipv6cp
.restart
= 0;
1657 sess_local
[s
].ccp
.restart
= 0;
1659 cluster_send_session(s
);
1662 void sendipcp(sessionidt s
, tunnelidt t
)
1664 uint8_t buf
[MAXETHER
];
1668 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
1670 if (!session
[s
].unique_id
)
1672 if (!++last_id
) ++last_id
; // skip zero
1673 session
[s
].unique_id
= last_id
;
1676 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
);
1680 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
1681 *(uint16_t *) (q
+ 2) = htons(10); // packet length
1682 q
[4] = 3; // ip address option
1683 q
[5] = 6; // option length
1684 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1685 config
->bind_address
? config
->bind_address
:
1686 my_address
; // send my IP
1688 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1689 restart_timer(s
, ipcp
);
1692 void sendipv6cp(sessionidt s
, tunnelidt t
)
1694 uint8_t buf
[MAXETHER
];
1698 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
1700 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
);
1704 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
1705 // only send one type
1707 *(uint16_t *) (q
+ 2) = htons(14);
1708 q
[4] = 1; // interface identifier option
1709 q
[5] = 10; // option length
1710 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1711 *(uint32_t *) (q
+ 10) = 0;
1714 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1715 restart_timer(s
, ipv6cp
);
1718 static void sessionclear(sessionidt s
)
1720 memset(&session
[s
], 0, sizeof(session
[s
]));
1721 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1722 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1724 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1725 session
[s
].next
= sessionfree
;
1729 // kill a session now
1730 void sessionkill(sessionidt s
, char *reason
)
1735 if (!session
[s
].opened
) // not alive
1738 if (session
[s
].next
)
1740 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1744 session
[s
].die
= TIME
;
1745 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1746 if (sess_local
[s
].radius
)
1747 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1749 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1751 cluster_send_session(s
);
1754 static void tunnelclear(tunnelidt t
)
1757 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1758 tunnel
[t
].state
= TUNNELFREE
;
1761 // kill a tunnel now
1762 static void tunnelkill(tunnelidt t
, char *reason
)
1769 tunnel
[t
].state
= TUNNELDIE
;
1771 // free control messages
1772 while ((c
= tunnel
[t
].controls
))
1774 controlt
* n
= c
->next
;
1775 tunnel
[t
].controls
= n
;
1776 tunnel
[t
].controlc
--;
1777 c
->next
= controlfree
;
1781 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1782 if (session
[s
].tunnel
== t
)
1783 sessionkill(s
, reason
);
1787 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1788 cli_tunnel_actions
[t
].action
= 0;
1789 cluster_send_tunnel(t
);
1792 // shut down a tunnel cleanly
1793 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1797 CSTAT(tunnelshutdown
);
1799 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1801 // never set up, can immediately kill
1802 tunnelkill(t
, reason
);
1805 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1808 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1809 if (session
[s
].tunnel
== t
)
1810 sessionshutdown(s
, reason
, 0, 0);
1812 tunnel
[t
].state
= TUNNELDIE
;
1813 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1814 cluster_send_tunnel(t
);
1815 // TBA - should we wait for sessions to stop?
1818 controlt
*c
= controlnew(4); // sending StopCCN
1823 *(uint16_t *) buf
= htons(result
);
1824 *(uint16_t *) (buf
+2) = htons(error
);
1827 int m
= strlen(msg
);
1828 if (m
+ 4 > sizeof(buf
))
1829 m
= sizeof(buf
) - 4;
1831 memcpy(buf
+4, msg
, m
);
1835 controlb(c
, 1, buf
, l
, 1);
1838 control16(c
, 1, result
, 1);
1840 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1841 controladd(c
, 0, t
); // send the message
1845 // read and process packet on tunnel (UDP)
1846 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
1848 uint8_t *chapresponse
= NULL
;
1849 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1850 uint8_t *p
= buf
+ 2;
1857 LOG_HEX(5, "UDP Data", buf
, len
);
1858 STAT(tunnel_rx_packets
);
1859 INC_STAT(tunnel_rx_bytes
, len
);
1862 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1863 STAT(tunnel_rx_errors
);
1866 if ((buf
[1] & 0x0F) != 2)
1868 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1869 STAT(tunnel_rx_errors
);
1874 l
= ntohs(*(uint16_t *) p
);
1877 t
= ntohs(*(uint16_t *) p
);
1879 s
= ntohs(*(uint16_t *) p
);
1881 if (s
>= MAXSESSION
)
1883 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1884 STAT(tunnel_rx_errors
);
1889 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1890 STAT(tunnel_rx_errors
);
1895 ns
= ntohs(*(uint16_t *) p
);
1897 nr
= ntohs(*(uint16_t *) p
);
1902 uint16_t o
= ntohs(*(uint16_t *) p
);
1907 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1908 STAT(tunnel_rx_errors
);
1913 // used to time out old tunnels
1914 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
1915 tunnel
[t
].lastrec
= time_now
;
1919 uint16_t message
= 0xFFFF; // message type
1921 uint8_t mandatory
= 0;
1922 uint16_t asession
= 0; // assigned session
1923 uint32_t amagic
= 0; // magic number
1924 uint8_t aflags
= 0; // flags from last LCF
1925 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1926 char called
[MAXTEL
] = ""; // called number
1927 char calling
[MAXTEL
] = ""; // calling number
1929 if (!config
->cluster_iam_master
)
1931 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1935 // control messages must have bits 0x80|0x40|0x08
1936 // (type, length and sequence) set, and bits 0x02|0x01
1937 // (offset and priority) clear
1938 if ((*buf
& 0xCB) != 0xC8)
1940 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1941 STAT(tunnel_rx_errors
);
1945 // check for duplicate tunnel open message
1951 // Is this a duplicate of the first packet? (SCCRQ)
1953 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1955 if (tunnel
[i
].state
!= TUNNELOPENING
||
1956 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1957 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1960 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1965 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1966 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1968 // if no tunnel specified, assign one
1971 if (!(t
= new_tunnel()))
1973 LOG(1, 0, 0, "No more tunnels\n");
1974 STAT(tunnel_overflow
);
1978 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1979 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1980 tunnel
[t
].window
= 4; // default window
1981 STAT(tunnel_created
);
1982 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1983 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1986 // If the 'ns' just received is not the 'nr' we're
1987 // expecting, just send an ack and drop it.
1989 // if 'ns' is less, then we got a retransmitted packet.
1990 // if 'ns' is greater than missed a packet. Either way
1991 // we should ignore it.
1992 if (ns
!= tunnel
[t
].nr
)
1994 // is this the sequence we were expecting?
1995 STAT(tunnel_rx_errors
);
1996 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1997 t
, ns
, tunnel
[t
].nr
);
1999 if (l
) // Is this not a ZLB?
2004 // check sequence of this message
2006 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2007 // some to clear maybe?
2008 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2010 controlt
*c
= tunnel
[t
].controls
;
2011 tunnel
[t
].controls
= c
->next
;
2012 tunnel
[t
].controlc
--;
2013 c
->next
= controlfree
;
2016 tunnel
[t
].try = 0; // we have progress
2019 // receiver advance (do here so quoted correctly in any sends below)
2020 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2021 if (skip
< 0) skip
= 0;
2022 if (skip
< tunnel
[t
].controlc
)
2024 // some control packets can now be sent that were previous stuck out of window
2025 int tosend
= tunnel
[t
].window
- skip
;
2026 controlt
*c
= tunnel
[t
].controls
;
2034 tunnel
[t
].try = 0; // first send
2035 tunnelsend(c
->buf
, c
->length
, t
);
2040 if (!tunnel
[t
].controlc
)
2041 tunnel
[t
].retry
= 0; // caught up
2044 { // if not a null message
2050 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2052 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2058 LOG(1, s
, t
, "Invalid length in AVP\n");
2059 STAT(tunnel_rx_errors
);
2064 if (flags
& 0x3C) // reserved bits, should be clear
2066 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2068 result
= 2; // general error
2069 error
= 3; // reserved field non-zero
2074 if (*(uint16_t *) (b
))
2076 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
2078 result
= 2; // general error
2079 error
= 6; // generic vendor-specific error
2080 msg
= "unsupported vendor-specific";
2084 mtype
= ntohs(*(uint16_t *) (b
));
2092 // handle hidden AVPs
2093 if (!*config
->l2tp_secret
)
2095 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2097 result
= 2; // general error
2098 error
= 6; // generic vendor-specific error
2099 msg
= "secret not specified";
2102 if (!session
[s
].random_vector_length
)
2104 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2106 result
= 2; // general error
2107 error
= 6; // generic
2108 msg
= "no random vector";
2113 LOG(2, s
, t
, "Short hidden AVP.\n");
2115 result
= 2; // general error
2116 error
= 2; // length is wrong
2122 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2124 orig_len
= ntohs(*(uint16_t *) b
);
2125 if (orig_len
> n
+ 2)
2127 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2131 result
= 2; // general error
2132 error
= 2; // length is wrong
2141 LOG(4, s
, t
, " AVP %d (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2142 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2146 case 0: // message type
2147 message
= ntohs(*(uint16_t *) b
);
2148 mandatory
= flags
& 0x80;
2149 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_code(message
));
2151 case 1: // result code
2153 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2154 const char* resdesc
= "(unknown)";
2157 resdesc
= l2tp_stopccn_result_code(rescode
);
2159 else if (message
== 14)
2161 resdesc
= l2tp_cdn_result_code(rescode
);
2164 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2167 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2168 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, l2tp_error_code(errcode
));
2171 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2176 case 2: // protocol version
2178 version
= ntohs(*(uint16_t *) (b
));
2179 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2180 if (version
&& version
!= 0x0100)
2181 { // allow 0.0 and 1.0
2182 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2184 result
= 5; // unspported protocol version
2185 error
= 0x0100; // supported version
2191 case 3: // framing capabilities
2192 // LOG(4, s, t, "Framing capabilities\n");
2194 case 4: // bearer capabilities
2195 // LOG(4, s, t, "Bearer capabilities\n");
2197 case 5: // tie breaker
2198 // We never open tunnels, so we don't care about tie breakers
2199 // LOG(4, s, t, "Tie breaker\n");
2201 case 6: // firmware revision
2202 // LOG(4, s, t, "Firmware revision\n");
2204 case 7: // host name
2205 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2206 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2207 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2208 // TBA - to send to RADIUS
2210 case 8: // vendor name
2211 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2212 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2213 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2215 case 9: // assigned tunnel
2216 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2217 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2219 case 10: // rx window
2220 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2221 if (!tunnel
[t
].window
)
2222 tunnel
[t
].window
= 1; // window of 0 is silly
2223 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2225 case 11: // Challenge
2227 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2228 build_chap_response(b
, 2, n
, &chapresponse
);
2231 case 13: // Response
2232 // Why did they send a response? We never challenge.
2233 LOG(2, s
, t
, " received unexpected challenge response\n");
2236 case 14: // assigned session
2237 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2238 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2240 case 15: // call serial number
2241 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2243 case 18: // bearer type
2244 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2247 case 19: // framing type
2248 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2251 case 21: // called number
2252 memset(called
, 0, sizeof(called
));
2253 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2254 LOG(4, s
, t
, " Called <%s>\n", called
);
2256 case 22: // calling number
2257 memset(calling
, 0, sizeof(calling
));
2258 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2259 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2263 case 24: // tx connect speed
2266 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2270 // AS5300s send connect speed as a string
2272 memset(tmp
, 0, sizeof(tmp
));
2273 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2274 session
[s
].tx_connect_speed
= atol(tmp
);
2276 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2278 case 38: // rx connect speed
2281 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2285 // AS5300s send connect speed as a string
2287 memset(tmp
, 0, sizeof(tmp
));
2288 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2289 session
[s
].rx_connect_speed
= atol(tmp
);
2291 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2293 case 25: // Physical Channel ID
2295 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2296 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2299 case 29: // Proxy Authentication Type
2301 uint16_t atype
= ntohs(*(uint16_t *)b
);
2302 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, ppp_auth_type(atype
));
2305 case 30: // Proxy Authentication Name
2308 memset(authname
, 0, sizeof(authname
));
2309 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2310 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2314 case 31: // Proxy Authentication Challenge
2316 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2319 case 32: // Proxy Authentication ID
2321 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2322 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2325 case 33: // Proxy Authentication Response
2326 LOG(4, s
, t
, " Proxy Auth Response\n");
2328 case 27: // last sent lcp
2329 { // find magic number
2330 uint8_t *p
= b
, *e
= p
+ n
;
2331 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2333 if (*p
== 5 && p
[1] == 6) // Magic-Number
2334 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2335 else if (*p
== 7) // Protocol-Field-Compression
2336 aflags
|= SESSION_PFC
;
2337 else if (*p
== 8) // Address-and-Control-Field-Compression
2338 aflags
|= SESSION_ACFC
;
2343 case 28: // last recv lcp confreq
2345 case 26: // Initial Received LCP CONFREQ
2347 case 39: // seq required - we control it as an LNS anyway...
2349 case 36: // Random Vector
2350 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2351 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2352 if (n
> sizeof(session
[s
].random_vector
))
2353 n
= sizeof(session
[s
].random_vector
);
2354 memcpy(session
[s
].random_vector
, b
, n
);
2355 session
[s
].random_vector_length
= n
;
2359 static char e
[] = "unknown AVP 0xXXXX";
2360 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2362 result
= 2; // general error
2363 error
= 8; // unknown mandatory AVP
2364 sprintf((msg
= e
) + 14, "%04x", mtype
);
2371 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2375 case 1: // SCCRQ - Start Control Connection Request
2376 tunnel
[t
].state
= TUNNELOPENING
;
2377 if (main_quit
!= QUIT_SHUTDOWN
)
2379 controlt
*c
= controlnew(2); // sending SCCRP
2380 control16(c
, 2, version
, 1); // protocol version
2381 control32(c
, 3, 3, 1); // framing
2382 controls(c
, 7, hostname
, 1); // host name
2383 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2384 control16(c
, 9, t
, 1); // assigned tunnel
2385 controladd(c
, 0, t
); // send the resply
2389 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2393 tunnel
[t
].state
= TUNNELOPEN
;
2396 tunnel
[t
].state
= TUNNELOPEN
;
2397 controlnull(t
); // ack
2400 controlnull(t
); // ack
2401 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2404 controlnull(t
); // simply ACK
2416 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2418 controlt
*c
= controlnew(11); // ICRP
2421 sessionfree
= session
[s
].next
;
2422 memset(&session
[s
], 0, sizeof(session
[s
]));
2424 if (s
> config
->cluster_highest_sessionid
)
2425 config
->cluster_highest_sessionid
= s
;
2427 session
[s
].opened
= time_now
;
2428 session
[s
].tunnel
= t
;
2429 session
[s
].far
= asession
;
2430 session
[s
].last_packet
= time_now
;
2431 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2432 control16(c
, 14, s
, 1); // assigned session
2433 controladd(c
, asession
, t
); // send the reply
2435 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2436 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2438 session
[s
].ppp
.phase
= Establish
;
2439 session
[s
].ppp
.lcp
= Starting
;
2441 STAT(session_created
);
2446 controlt
*c
= controlnew(14); // CDN
2449 STAT(session_overflow
);
2450 LOG(1, 0, t
, "No free sessions\n");
2451 control16(c
, 1, 4, 0); // temporary lack of resources
2454 control16(c
, 1, 2, 7); // shutting down, try another
2456 controladd(c
, asession
, t
); // send the message
2463 if (amagic
== 0) amagic
= time_now
;
2464 session
[s
].magic
= amagic
; // set magic number
2465 session
[s
].flags
= aflags
; // set flags received
2466 session
[s
].mru
= PPPoE_MRU
; // default
2467 controlnull(t
); // ack
2470 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
2471 sess_local
[s
].ppp_mru
= MRU
;
2473 change_state(s
, lcp
, RequestSent
);
2477 controlnull(t
); // ack
2478 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2481 LOG(1, s
, t
, "Missing message type\n");
2484 STAT(tunnel_rx_errors
);
2486 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2488 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2491 if (chapresponse
) free(chapresponse
);
2492 cluster_send_tunnel(t
);
2496 LOG(4, s
, t
, " Got a ZLB ack\n");
2503 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2504 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2505 { // HDLC address header, discard
2511 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2512 STAT(tunnel_rx_errors
);
2522 proto
= ntohs(*(uint16_t *) p
);
2527 if (s
&& !session
[s
].opened
) // Is something wrong??
2529 if (!config
->cluster_iam_master
)
2531 // Pass it off to the master to deal with..
2532 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2537 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2538 STAT(tunnel_rx_errors
);
2542 if (proto
== PPPPAP
)
2544 session
[s
].last_packet
= time_now
;
2545 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2546 processpap(s
, t
, p
, l
);
2548 else if (proto
== PPPCHAP
)
2550 session
[s
].last_packet
= time_now
;
2551 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2552 processchap(s
, t
, p
, l
);
2554 else if (proto
== PPPLCP
)
2556 session
[s
].last_packet
= time_now
;
2557 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2558 processlcp(s
, t
, p
, l
);
2560 else if (proto
== PPPIPCP
)
2562 session
[s
].last_packet
= time_now
;
2563 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2564 processipcp(s
, t
, p
, l
);
2566 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
2568 session
[s
].last_packet
= time_now
;
2569 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2570 processipv6cp(s
, t
, p
, l
);
2572 else if (proto
== PPPCCP
)
2574 session
[s
].last_packet
= time_now
;
2575 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2576 processccp(s
, t
, p
, l
);
2578 else if (proto
== PPPIP
)
2582 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2583 return; // closing session, PPP not processed
2586 session
[s
].last_packet
= time_now
;
2587 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2589 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2593 processipin(s
, t
, p
, l
);
2595 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
2599 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2600 return; // closing session, PPP not processed
2603 session
[s
].last_packet
= time_now
;
2604 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2606 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2610 processipv6in(s
, t
, p
, l
);
2612 else if (session
[s
].ppp
.lcp
== Opened
)
2614 session
[s
].last_packet
= time_now
;
2615 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2616 protoreject(s
, t
, p
, l
, proto
);
2620 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
2621 proto
, ppp_state(session
[s
].ppp
.lcp
));
2626 // read and process packet on tun
2627 static void processtun(uint8_t * buf
, int len
)
2629 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2630 STAT(tun_rx_packets
);
2631 INC_STAT(tun_rx_bytes
, len
);
2639 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2640 STAT(tun_rx_errors
);
2644 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2645 processipout(buf
, len
);
2646 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2647 && config
->ipv6_prefix
.s6_addr
[0])
2648 processipv6out(buf
, len
);
2653 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
2654 // that we look at the whole of the tunnel, radius and session tables
2656 static void regular_cleanups(double period
)
2658 // Next tunnel, radius and session to check for actions on.
2659 static tunnelidt t
= 0;
2661 static sessionidt s
= 0;
2674 // divide up tables into slices based on the last run
2675 t_slice
= config
->cluster_highest_tunnelid
* period
;
2676 r_slice
= (MAXRADIUS
- 1) * period
;
2677 s_slice
= config
->cluster_highest_sessionid
* period
;
2681 else if (t_slice
> config
->cluster_highest_tunnelid
)
2682 t_slice
= config
->cluster_highest_tunnelid
;
2686 else if (r_slice
> (MAXRADIUS
- 1))
2687 r_slice
= MAXRADIUS
- 1;
2691 else if (s_slice
> config
->cluster_highest_sessionid
)
2692 s_slice
= config
->cluster_highest_sessionid
;
2694 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
2696 for (i
= 0; i
< t_slice
; i
++)
2699 if (t
> config
->cluster_highest_tunnelid
)
2702 // check for expired tunnels
2703 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2705 STAT(tunnel_timeout
);
2706 tunnelkill(t
, "Expired");
2710 // check for message resend
2711 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2713 // resend pending messages as timeout on reply
2714 if (tunnel
[t
].retry
<= TIME
)
2716 controlt
*c
= tunnel
[t
].controls
;
2717 uint8_t w
= tunnel
[t
].window
;
2718 tunnel
[t
].try++; // another try
2719 if (tunnel
[t
].try > 5)
2720 tunnelkill(t
, "Timeout on control message"); // game over
2724 tunnelsend(c
->buf
, c
->length
, t
);
2732 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
2734 controlt
*c
= controlnew(6); // sending HELLO
2735 controladd(c
, 0, t
); // send the message
2736 LOG(3, 0, t
, "Sending HELLO message\n");
2740 // Check for tunnel changes requested from the CLI
2741 if ((a
= cli_tunnel_actions
[t
].action
))
2743 cli_tunnel_actions
[t
].action
= 0;
2744 if (a
& CLI_TUN_KILL
)
2746 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2747 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2753 for (i
= 0; i
< r_slice
; i
++)
2759 if (!radius
[r
].state
)
2762 if (radius
[r
].retry
<= TIME
)
2769 for (i
= 0; i
< s_slice
; i
++)
2772 if (s
> config
->cluster_highest_sessionid
)
2775 if (!session
[s
].opened
) // Session isn't in use
2778 // check for expired sessions
2781 if (session
[s
].die
<= TIME
)
2783 sessionkill(s
, "Expired");
2790 if (sess_local
[s
].lcp
.restart
<= time_now
)
2792 int next_state
= session
[s
].ppp
.lcp
;
2793 switch (session
[s
].ppp
.lcp
)
2797 next_state
= RequestSent
;
2800 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
2802 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
2803 sendlcp(s
, session
[s
].tunnel
);
2804 change_state(s
, lcp
, next_state
);
2808 sessionshutdown(s
, "No response to LCP ConfigReq.", 3, 0);
2809 STAT(session_timeout
);
2819 if (sess_local
[s
].ipcp
.restart
<= time_now
)
2821 int next_state
= session
[s
].ppp
.ipcp
;
2822 switch (session
[s
].ppp
.ipcp
)
2826 next_state
= RequestSent
;
2829 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
2831 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
2832 sendipcp(s
, session
[s
].tunnel
);
2833 change_state(s
, ipcp
, next_state
);
2837 sessionshutdown(s
, "No response to IPCP ConfigReq.", 3, 0);
2838 STAT(session_timeout
);
2848 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
2850 int next_state
= session
[s
].ppp
.ipv6cp
;
2851 switch (session
[s
].ppp
.ipv6cp
)
2855 next_state
= RequestSent
;
2858 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
2860 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
2861 sendipv6cp(s
, session
[s
].tunnel
);
2862 change_state(s
, ipv6cp
, next_state
);
2866 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
2867 change_state(s
, ipv6cp
, Stopped
);
2874 if (sess_local
[s
].ccp
.restart
<= time_now
)
2876 int next_state
= session
[s
].ppp
.ccp
;
2877 switch (session
[s
].ppp
.ccp
)
2881 next_state
= RequestSent
;
2884 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
2886 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
2887 sendccp(s
, session
[s
].tunnel
);
2888 change_state(s
, ccp
, next_state
);
2892 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
2893 change_state(s
, ccp
, Stopped
);
2900 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2901 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2903 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2904 STAT(session_timeout
);
2909 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2910 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
) &&
2911 (time_now
- sess_local
[s
].last_echo
>= ECHO_TIMEOUT
))
2913 uint8_t b
[MAXETHER
];
2915 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
);
2919 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2920 *(uint16_t *)(q
+ 2) = htons(8); // Length
2921 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
2923 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2924 (int)(time_now
- session
[s
].last_packet
));
2925 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2926 sess_local
[s
].last_echo
= time_now
;
2930 // Check for actions requested from the CLI
2931 if ((a
= cli_session_actions
[s
].action
))
2935 cli_session_actions
[s
].action
= 0;
2936 if (a
& CLI_SESS_KILL
)
2938 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2939 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2940 a
= 0; // dead, no need to check for other actions
2944 if (a
& CLI_SESS_NOSNOOP
)
2946 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2947 session
[s
].snoop_ip
= 0;
2948 session
[s
].snoop_port
= 0;
2952 else if (a
& CLI_SESS_SNOOP
)
2954 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2955 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2956 cli_session_actions
[s
].snoop_port
);
2958 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2959 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2964 if (a
& CLI_SESS_NOTHROTTLE
)
2966 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2967 throttle_session(s
, 0, 0);
2971 else if (a
& CLI_SESS_THROTTLE
)
2973 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2974 cli_session_actions
[s
].throttle_in
,
2975 cli_session_actions
[s
].throttle_out
);
2977 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2982 if (a
& CLI_SESS_NOFILTER
)
2984 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2985 filter_session(s
, 0, 0);
2989 else if (a
& CLI_SESS_FILTER
)
2991 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2992 cli_session_actions
[s
].filter_in
,
2993 cli_session_actions
[s
].filter_out
);
2995 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3001 cluster_send_session(s
);
3004 // RADIUS interim accounting
3005 if (config
->radius_accounting
&& config
->radius_interim
> 0
3006 && session
[s
].ip
&& !session
[s
].walled_garden
3007 && !sess_local
[s
].radius
// RADIUS already in progress
3008 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
3010 int rad
= radiusnew(s
);
3013 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3014 STAT(radius_overflow
);
3018 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3019 session
[s
].user
, session
[s
].unique_id
);
3021 radiussend(rad
, RADIUSINTERIM
);
3022 sess_local
[s
].last_interim
= time_now
;
3027 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3028 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3032 // Are we in the middle of a tunnel update, or radius
3035 static int still_busy(void)
3038 static clockt last_talked
= 0;
3039 static clockt start_busy_wait
= 0;
3041 if (!config
->cluster_iam_master
)
3044 static time_t stopped_bgp
= 0;
3049 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3051 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3052 if (bgp_peers
[i
].state
== Established
)
3053 bgp_stop(&bgp_peers
[i
]);
3055 stopped_bgp
= time_now
;
3057 // we don't want to become master
3058 cluster_send_ping(0);
3063 if (time_now
< (stopped_bgp
+ QUIT_DELAY
))
3071 if (main_quit
== QUIT_SHUTDOWN
)
3073 static int dropped
= 0;
3078 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3079 for (i
= 1; i
< MAXTUNNEL
; i
++)
3080 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3081 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3087 if (start_busy_wait
== 0)
3088 start_busy_wait
= TIME
;
3090 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3092 if (!tunnel
[i
].controlc
)
3095 if (last_talked
!= TIME
)
3097 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
3103 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3104 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3106 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3110 for (i
= 1; i
< MAXRADIUS
; i
++)
3112 if (radius
[i
].state
== RADIUSNULL
)
3114 if (radius
[i
].state
== RADIUSWAIT
)
3117 if (last_talked
!= TIME
)
3119 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
3129 # include <sys/epoll.h>
3131 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3132 # include "fake_epoll.h"
3135 // the base set of fds polled: cli, cluster, tun, udp, control, dae
3138 // additional polled fds
3140 # define EXTRA_FDS BGP_NUM_PEERS
3142 # define EXTRA_FDS 0
3145 // main loop - gets packets on tun or udp and processes them
3146 static void mainloop(void)
3150 clockt next_cluster_ping
= 0; // send initial ping immediately
3151 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3152 int maxevent
= sizeof(events
)/sizeof(*events
);
3154 if ((epollfd
= epoll_create(maxevent
)) < 0)
3156 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3160 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
3161 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
);
3163 /* setup our fds to poll for input */
3165 static struct event_data d
[BASE_FDS
];
3166 struct epoll_event e
;
3171 d
[i
].type
= FD_TYPE_CLI
;
3172 e
.data
.ptr
= &d
[i
++];
3173 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3175 d
[i
].type
= FD_TYPE_CLUSTER
;
3176 e
.data
.ptr
= &d
[i
++];
3177 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3179 d
[i
].type
= FD_TYPE_TUN
;
3180 e
.data
.ptr
= &d
[i
++];
3181 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3183 d
[i
].type
= FD_TYPE_UDP
;
3184 e
.data
.ptr
= &d
[i
++];
3185 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3187 d
[i
].type
= FD_TYPE_CONTROL
;
3188 e
.data
.ptr
= &d
[i
++];
3189 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3191 d
[i
].type
= FD_TYPE_DAE
;
3192 e
.data
.ptr
= &d
[i
++];
3193 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3197 signal(SIGPIPE
, SIG_IGN
);
3198 bgp_setup(config
->as_number
);
3199 if (config
->bind_address
)
3200 bgp_add_route(config
->bind_address
, 0xffffffff);
3202 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3204 if (config
->neighbour
[i
].name
[0])
3205 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3206 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3207 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3211 while (!main_quit
|| still_busy())
3221 config
->reload_config
++;
3224 if (config
->reload_config
)
3226 config
->reload_config
= 0;
3234 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3235 STAT(select_called
);
3240 if (errno
== EINTR
||
3241 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3244 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3250 struct sockaddr_in addr
;
3251 struct in_addr local
;
3256 int cluster_ready
= 0;
3259 int cluster_pkts
= 0;
3261 uint32_t bgp_events
[BGP_NUM_PEERS
];
3262 memset(bgp_events
, 0, sizeof(bgp_events
));
3265 for (c
= n
, i
= 0; i
< c
; i
++)
3267 struct event_data
*d
= events
[i
].data
.ptr
;
3271 case FD_TYPE_CLI
: // CLI connections
3275 alen
= sizeof(addr
);
3276 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3282 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3288 // these are handled below, with multiple interleaved reads
3289 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3290 case FD_TYPE_TUN
: tun_ready
++; break;
3291 case FD_TYPE_UDP
: udp_ready
++; break;
3293 case FD_TYPE_CONTROL
: // nsctl commands
3294 alen
= sizeof(addr
);
3295 s
= recvfromto(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
3296 if (s
> 0) processcontrol(buf
, s
, &addr
, alen
, &local
);
3300 case FD_TYPE_DAE
: // DAE requests
3301 alen
= sizeof(addr
);
3302 s
= recvfrom(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
3303 if (s
> 0) processdae(buf
, s
, &addr
, alen
);
3307 case FD_TYPE_RADIUS
: // RADIUS response
3308 alen
= sizeof(addr
);
3309 s
= recvfrom(radfds
[d
->index
], buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
3310 if (s
>= 0 && config
->cluster_iam_master
)
3312 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
3313 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
3314 processrad(buf
, s
, d
->index
);
3316 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3317 fmtaddr(addr
.sin_addr
.s_addr
, 0));
3325 bgp_events
[d
->index
] = events
[i
].events
;
3331 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
3336 bgp_process(bgp_events
);
3339 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3344 alen
= sizeof(addr
);
3345 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3347 processudp(buf
, s
, &addr
);
3360 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3375 alen
= sizeof(addr
);
3376 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3378 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3389 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3390 STAT(multi_read_used
);
3392 if (c
>= config
->multi_read_count
)
3394 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3395 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3397 STAT(multi_read_exceeded
);
3404 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
3406 // Log current traffic stats
3407 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3408 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3409 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
3410 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
3411 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
3413 udp_tx
= udp_rx
= 0;
3414 udp_rx_pkt
= eth_rx_pkt
= 0;
3415 eth_tx
= eth_rx
= 0;
3418 if (config
->dump_speed
)
3419 printf("%s\n", config
->bandwidth
);
3421 // Update the internal time counter
3422 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3426 struct param_timer p
= { time_now
};
3427 run_plugins(PLUGIN_TIMER
, &p
);
3431 // Runs on every machine (master and slaves).
3432 if (next_cluster_ping
<= TIME
)
3434 // Check to see which of the cluster is still alive..
3436 cluster_send_ping(basetime
); // Only does anything if we're a slave
3437 cluster_check_master(); // ditto.
3439 cluster_heartbeat(); // Only does anything if we're a master.
3440 cluster_check_slaves(); // ditto.
3442 master_update_counts(); // If we're a slave, send our byte counters to our master.
3444 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3445 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3447 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3450 if (!config
->cluster_iam_master
)
3453 // Run token bucket filtering queue..
3454 // Only run it every 1/10th of a second.
3456 static clockt last_run
= 0;
3457 if (last_run
!= TIME
)
3464 // Handle timeouts, retries etc.
3466 static double last_clean
= 0;
3470 TIME
= now(&this_clean
);
3471 diff
= this_clean
- last_clean
;
3473 // Run during idle time (after we've handled
3474 // all incoming packets) or every 1/10th sec
3475 if (!more
|| diff
> 0.1)
3477 regular_cleanups(diff
);
3478 last_clean
= this_clean
;
3482 if (*config
->accounting_dir
)
3484 static clockt next_acct
= 0;
3485 static clockt next_shut_acct
= 0;
3487 if (next_acct
<= TIME
)
3489 // Dump accounting data
3490 next_acct
= TIME
+ ACCT_TIME
;
3491 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3494 else if (next_shut_acct
<= TIME
)
3496 // Dump accounting data for shutdown sessions
3497 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
3504 // Are we the master and shutting down??
3505 if (config
->cluster_iam_master
)
3506 cluster_heartbeat(); // Flush any queued changes..
3508 // Ok. Notify everyone we're shutting down. If we're
3509 // the master, this will force an election.
3510 cluster_send_ping(0);
3513 // Important!!! We MUST not process any packets past this point!
3514 LOG(1, 0, 0, "Shutdown complete\n");
3517 static void stripdomain(char *host
)
3521 if ((p
= strchr(host
, '.')))
3527 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3533 while (fgets(buf
, sizeof(buf
), resolv
))
3535 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3538 if (!isspace(buf
[6]))
3542 while (isspace(*b
)) b
++;
3547 while (*b
&& !isspace(*b
)) b
++;
3549 if (buf
[0] == 'd') // domain is canonical
3555 // first search line
3558 // hold, may be subsequent domain line
3559 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3570 int hl
= strlen(host
);
3571 int dl
= strlen(domain
);
3572 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3573 host
[hl
-dl
- 1] = 0;
3577 *p
= 0; // everything after first dot
3582 // Init data structures
3583 static void initdata(int optdebug
, char *optconfig
)
3587 if (!(config
= shared_malloc(sizeof(configt
))))
3589 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3593 memset(config
, 0, sizeof(configt
));
3594 time(&config
->start_time
);
3595 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3596 config
->debug
= optdebug
;
3597 config
->num_tbfs
= MAXTBFS
;
3598 config
->rl_rate
= 28; // 28kbps
3599 config
->cluster_mcast_ttl
= 1;
3600 config
->cluster_master_min_adv
= 1;
3601 config
->ppp_restart_time
= 3;
3602 config
->ppp_max_configure
= 10;
3603 config
->ppp_max_failure
= 5;
3604 strcpy(config
->random_device
, RANDOMDEVICE
);
3606 log_stream
= stderr
;
3609 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3611 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3614 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3617 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3619 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3622 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3624 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3627 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3629 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3633 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3635 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3639 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3641 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3645 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3647 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3651 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3653 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3656 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3658 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3660 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3663 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3665 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3667 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3670 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3672 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3673 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3674 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3675 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3677 // Put all the sessions on the free list marked as undefined.
3678 for (i
= 1; i
< MAXSESSION
; i
++)
3680 session
[i
].next
= i
+ 1;
3681 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3683 session
[MAXSESSION
- 1].next
= 0;
3686 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3687 for (i
= 1; i
< MAXTUNNEL
; i
++)
3688 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3692 // Grab my hostname unless it's been specified
3693 gethostname(hostname
, sizeof(hostname
));
3694 stripdomain(hostname
);
3697 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3700 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3702 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3708 static int assign_ip_address(sessionidt s
)
3712 time_t best_time
= time_now
;
3713 char *u
= session
[s
].user
;
3717 CSTAT(assign_ip_address
);
3719 for (i
= 1; i
< ip_pool_size
; i
++)
3721 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3724 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3731 if (ip_address_pool
[i
].last
< best_time
)
3734 if (!(best_time
= ip_address_pool
[i
].last
))
3735 break; // never used, grab this one
3741 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3745 session
[s
].ip
= ip_address_pool
[best
].address
;
3746 session
[s
].ip_pool_index
= best
;
3747 ip_address_pool
[best
].assigned
= 1;
3748 ip_address_pool
[best
].last
= time_now
;
3749 ip_address_pool
[best
].session
= s
;
3750 if (session
[s
].walled_garden
)
3751 /* Don't track addresses of users in walled garden (note: this
3752 means that their address isn't "sticky" even if they get
3754 ip_address_pool
[best
].user
[0] = 0;
3756 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3759 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3760 reuse
? "Reusing" : "Allocating", best
);
3765 static void free_ip_address(sessionidt s
)
3767 int i
= session
[s
].ip_pool_index
;
3770 CSTAT(free_ip_address
);
3773 return; // what the?
3775 if (i
< 0) // Is this actually part of the ip pool?
3779 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3781 ip_address_pool
[i
].assigned
= 0;
3782 ip_address_pool
[i
].session
= 0;
3783 ip_address_pool
[i
].last
= time_now
;
3787 // Fsck the address pool against the session table.
3788 // Normally only called when we become a master.
3790 // This isn't perfect: We aren't keep tracking of which
3791 // users used to have an IP address.
3793 void rebuild_address_pool(void)
3798 // Zero the IP pool allocation, and build
3799 // a map from IP address to pool index.
3800 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3802 ip_address_pool
[i
].assigned
= 0;
3803 ip_address_pool
[i
].session
= 0;
3804 if (!ip_address_pool
[i
].address
)
3807 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3810 for (i
= 0; i
< MAXSESSION
; ++i
)
3813 if (!(session
[i
].opened
&& session
[i
].ip
))
3816 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3818 if (session
[i
].ip_pool_index
< 0)
3820 // Not allocated out of the pool.
3821 if (ipid
< 1) // Not found in the pool either? good.
3824 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3825 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3827 // Fall through and process it as part of the pool.
3831 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3833 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3835 session
[i
].ip_pool_index
= ipid
;
3839 ip_address_pool
[ipid
].assigned
= 1;
3840 ip_address_pool
[ipid
].session
= i
;
3841 ip_address_pool
[ipid
].last
= time_now
;
3842 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3843 session
[i
].ip_pool_index
= ipid
;
3844 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3849 // Fix the address pool to match a changed session.
3850 // (usually when the master sends us an update).
3851 static void fix_address_pool(int sid
)
3855 ipid
= session
[sid
].ip_pool_index
;
3857 if (ipid
> ip_pool_size
)
3858 return; // Ignore it. rebuild_address_pool will fix it up.
3860 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3861 return; // Just ignore it. rebuild_address_pool will take care of it.
3863 ip_address_pool
[ipid
].assigned
= 1;
3864 ip_address_pool
[ipid
].session
= sid
;
3865 ip_address_pool
[ipid
].last
= time_now
;
3866 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3870 // Add a block of addresses to the IP pool to hand out.
3872 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3876 mask
= 0xffffffff; // Host route only.
3880 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3883 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3885 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3886 continue; // Skip 0 and broadcast addresses.
3888 ip_address_pool
[ip_pool_size
].address
= i
;
3889 ip_address_pool
[ip_pool_size
].assigned
= 0;
3891 if (ip_pool_size
>= MAXIPPOOL
)
3893 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3899 // Initialize the IP address pool
3900 static void initippool()
3905 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3907 if (!(f
= fopen(IPPOOLFILE
, "r")))
3909 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3913 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3916 buf
[4095] = 0; // Force it to be zero terminated/
3918 if (*buf
== '#' || *buf
== '\n')
3919 continue; // Skip comments / blank lines
3920 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3921 if ((p
= (char *)strchr(buf
, ':')))
3925 src
= inet_addr(buf
);
3926 if (src
== INADDR_NONE
)
3928 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3931 // This entry is for a specific IP only
3932 if (src
!= config
->bind_address
)
3937 if ((p
= (char *)strchr(pool
, '/')))
3941 in_addr_t start
= 0, mask
= 0;
3943 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3945 if (!*p
|| !(numbits
= atoi(p
)))
3947 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3950 start
= ntohl(inet_addr(pool
));
3951 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3953 // Add a static route for this pool
3954 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3955 fmtaddr(htonl(start
), 0), 32 + mask
);
3957 routeset(0, start
, mask
, 0, 1);
3959 add_to_ip_pool(start
, mask
);
3963 // It's a single ip address
3964 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
3968 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3971 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3973 struct sockaddr_in snoop_addr
= {0};
3974 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3977 snoop_addr
.sin_family
= AF_INET
;
3978 snoop_addr
.sin_addr
.s_addr
= destination
;
3979 snoop_addr
.sin_port
= ntohs(port
);
3981 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3982 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3983 htons(snoop_addr
.sin_port
));
3985 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3986 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3988 STAT(packets_snooped
);
3991 static int dump_session(FILE **f
, sessiont
*s
)
3993 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
3998 char filename
[1024];
4000 time_t now
= time(NULL
);
4002 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4003 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4005 if (!(*f
= fopen(filename
, "w")))
4007 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
4011 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
4012 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
4017 "# format: username ip qos uptxoctets downrxoctets\n",
4019 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
4024 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
4025 fprintf(*f
, "%s %s %d %u %u\n",
4026 s
->user
, // username
4027 fmtaddr(htonl(s
->ip
), 0), // ip
4028 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
4029 (uint32_t) s
->cin_delta
, // uptxoctets
4030 (uint32_t) s
->cout_delta
); // downrxoctets
4032 s
->cin_delta
= s
->cout_delta
= 0;
4037 static void dump_acct_info(int all
)
4043 CSTAT(dump_acct_info
);
4047 for (i
= 0; i
< shut_acct_n
; i
++)
4048 dump_session(&f
, &shut_acct
[i
]);
4054 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4055 dump_session(&f
, &session
[i
]);
4062 int main(int argc
, char *argv
[])
4066 char *optconfig
= CONFIGFILE
;
4068 time(&basetime
); // start clock
4071 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
4076 if (fork()) exit(0);
4078 freopen("/dev/null", "r", stdin
);
4079 freopen("/dev/null", "w", stdout
);
4080 freopen("/dev/null", "w", stderr
);
4089 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
4092 printf("Args are:\n"
4093 "\t-d\t\tDetach from terminal\n"
4094 "\t-c <file>\tConfig file\n"
4095 "\t-h <hostname>\tForce hostname\n"
4103 // Start the timer routine off
4105 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4108 initdata(optdebug
, optconfig
);
4113 init_tbf(config
->num_tbfs
);
4115 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
4116 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
4117 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4120 rlim
.rlim_cur
= RLIM_INFINITY
;
4121 rlim
.rlim_max
= RLIM_INFINITY
;
4122 // Remove the maximum core size
4123 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
4124 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
4126 // Make core dumps go to /tmp
4130 if (config
->scheduler_fifo
)
4133 struct sched_param params
= {0};
4134 params
.sched_priority
= 1;
4136 if (get_nprocs() < 2)
4138 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4139 config
->scheduler_fifo
= 0;
4143 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4145 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4149 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4150 config
->scheduler_fifo
= 0;
4155 /* Set up the cluster communications port. */
4156 if (cluster_init() < 0)
4160 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4168 unsigned seed
= time_now
^ getpid();
4169 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4173 signal(SIGHUP
, sighup_handler
);
4174 signal(SIGCHLD
, sigchild_handler
);
4175 signal(SIGTERM
, shutdown_handler
);
4176 signal(SIGINT
, shutdown_handler
);
4177 signal(SIGQUIT
, shutdown_handler
);
4179 // Prevent us from getting paged out
4180 if (config
->lock_pages
)
4182 if (!mlockall(MCL_CURRENT
))
4183 LOG(1, 0, 0, "Locking pages into memory\n");
4185 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4188 // Drop privileges here
4189 if (config
->target_uid
> 0 && geteuid() == 0)
4190 setuid(config
->target_uid
);
4194 /* remove plugins (so cleanup code gets run) */
4197 // Remove the PID file if we wrote it
4198 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4199 unlink(config
->pid_file
);
4201 /* kill CLI children */
4202 signal(SIGTERM
, SIG_IGN
);
4207 static void sighup_handler(int sig
)
4212 static void shutdown_handler(int sig
)
4214 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4217 static void sigchild_handler(int sig
)
4219 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4223 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4226 *challenge_response
= NULL
;
4228 if (!*config
->l2tp_secret
)
4230 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4234 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4236 *challenge_response
= calloc(17, 1);
4239 MD5_Update(&ctx
, &id
, 1);
4240 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
4241 MD5_Update(&ctx
, challenge
, challenge_length
);
4242 MD5_Final(*challenge_response
, &ctx
);
4247 static int facility_value(char *name
)
4250 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4252 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4253 return facilitynames
[i
].c_val
;
4258 static void update_config()
4262 static int timeout
= 0;
4263 static int interval
= 0;
4270 if (log_stream
!= stderr
)
4276 if (*config
->log_filename
)
4278 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4280 char *p
= config
->log_filename
+ 7;
4283 openlog("l2tpns", LOG_PID
, facility_value(p
));
4287 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4289 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4291 fseek(log_stream
, 0, SEEK_END
);
4292 setbuf(log_stream
, NULL
);
4296 log_stream
= stderr
;
4297 setbuf(log_stream
, NULL
);
4303 log_stream
= stderr
;
4304 setbuf(log_stream
, NULL
);
4307 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
4308 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
4310 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
4311 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
4312 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
4314 // reset MRU/MSS globals
4315 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
4316 if (MRU
> PPPoE_MRU
)
4319 MSS
= MRU
- TCP_HDRS
;
4322 config
->numradiusservers
= 0;
4323 for (i
= 0; i
< MAXRADSERVER
; i
++)
4324 if (config
->radiusserver
[i
])
4326 config
->numradiusservers
++;
4327 // Set radius port: if not set, take the port from the
4328 // first radius server. For the first radius server,
4329 // take the #defined default value from l2tpns.h
4331 // test twice, In case someone works with
4332 // a secondary radius server without defining
4333 // a primary one, this will work even then.
4334 if (i
> 0 && !config
->radiusport
[i
])
4335 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4336 if (!config
->radiusport
[i
])
4337 config
->radiusport
[i
] = RADPORT
;
4340 if (!config
->numradiusservers
)
4341 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4343 // parse radius_authtypes_s
4344 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4345 p
= config
->radius_authtypes_s
;
4348 char *s
= strpbrk(p
, " \t,");
4354 while (*s
== ' ' || *s
== '\t')
4361 if (!strncasecmp("chap", p
, strlen(p
)))
4363 else if (!strncasecmp("pap", p
, strlen(p
)))
4366 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4368 config
->radius_authtypes
|= type
;
4369 if (!config
->radius_authprefer
)
4370 config
->radius_authprefer
= type
;
4375 if (!config
->radius_authtypes
)
4377 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4378 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4381 // normalise radius_authtypes_s
4382 if (config
->radius_authprefer
== AUTHPAP
)
4384 strcpy(config
->radius_authtypes_s
, "pap");
4385 if (config
->radius_authtypes
& AUTHCHAP
)
4386 strcat(config
->radius_authtypes_s
, ", chap");
4390 strcpy(config
->radius_authtypes_s
, "chap");
4391 if (config
->radius_authtypes
& AUTHPAP
)
4392 strcat(config
->radius_authtypes_s
, ", pap");
4395 if (!config
->radius_dae_port
)
4396 config
->radius_dae_port
= DAEPORT
;
4398 // re-initialise the random number source
4399 initrandom(config
->random_device
);
4402 for (i
= 0; i
< MAXPLUGINS
; i
++)
4404 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4407 if (*config
->plugins
[i
])
4410 add_plugin(config
->plugins
[i
]);
4412 else if (*config
->old_plugins
[i
])
4415 remove_plugin(config
->old_plugins
[i
]);
4419 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4420 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4421 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4422 if (!*config
->cluster_interface
)
4423 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4425 if (!config
->cluster_hb_interval
)
4426 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4428 if (!config
->cluster_hb_timeout
)
4429 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4431 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4433 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4434 // late, ensure we're sufficiently larger than that
4435 int t
= 4 * config
->cluster_hb_interval
+ 11;
4437 if (config
->cluster_hb_timeout
< t
)
4439 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4440 config
->cluster_hb_timeout
= t
;
4443 // Push timing changes to the slaves immediately if we're the master
4444 if (config
->cluster_iam_master
)
4445 cluster_heartbeat();
4447 interval
= config
->cluster_hb_interval
;
4448 timeout
= config
->cluster_hb_timeout
;
4452 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4455 if ((f
= fopen(config
->pid_file
, "w")))
4457 fprintf(f
, "%d\n", getpid());
4459 config
->wrote_pid
= 1;
4463 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4468 static void read_config_file()
4472 if (!config
->config_file
) return;
4473 if (!(f
= fopen(config
->config_file
, "r")))
4475 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4479 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4481 LOG(3, 0, 0, "Done reading config file\n");
4485 int sessionsetup(sessionidt s
, tunnelidt t
)
4487 // A session now exists, set it up
4493 CSTAT(sessionsetup
);
4495 LOG(3, s
, t
, "Doing session setup for session\n");
4499 assign_ip_address(s
);
4502 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4503 sessionshutdown(s
, "No IP addresses available.", 2, 7); // try another
4506 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4507 fmtaddr(htonl(session
[s
].ip
), 0));
4511 // Make sure this is right
4512 session
[s
].tunnel
= t
;
4514 // zap old sessions with same IP and/or username
4515 // Don't kill gardened sessions - doing so leads to a DoS
4516 // from someone who doesn't need to know the password
4519 user
= session
[s
].user
;
4520 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4522 if (i
== s
) continue;
4523 if (!session
[s
].opened
) continue;
4524 if (ip
== session
[i
].ip
)
4526 sessionkill(i
, "Duplicate IP address");
4530 if (config
->allow_duplicate_users
) continue;
4531 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4532 if (!strcasecmp(user
, session
[i
].user
))
4533 sessionkill(i
, "Duplicate session for users");
4540 // Add the route for this session.
4541 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4543 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4544 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4547 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4550 // Static IPs need to be routed if not already
4551 // convered by a Framed-Route. Anything else is part
4552 // of the IP address pool and is already routed, it
4553 // just needs to be added to the IP cache.
4554 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4555 if (session
[s
].ip_pool_index
== -1) // static ip
4557 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4560 cache_ipmap(session
[s
].ip
, s
);
4563 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
4564 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
4566 // Run the plugin's against this new session.
4568 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4569 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4572 // Allocate TBFs if throttled
4573 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4574 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4576 session
[s
].last_packet
= time_now
;
4578 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4579 fmtaddr(htonl(session
[s
].ip
), 0),
4580 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4582 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4584 return 1; // RADIUS OK and IP allocated, done...
4588 // This session just got dropped on us by the master or something.
4589 // Make sure our tables up up to date...
4591 int load_session(sessionidt s
, sessiont
*new)
4597 if (new->ip_pool_index
>= MAXIPPOOL
||
4598 new->tunnel
>= MAXTUNNEL
)
4600 LOG(0, s
, 0, "Strange session update received!\n");
4601 // FIXME! What to do here?
4606 // Ok. All sanity checks passed. Now we're committed to
4607 // loading the new session.
4610 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4612 // See if routes/ip cache need updating
4613 if (new->ip
!= session
[s
].ip
)
4616 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4617 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4618 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4626 // remove old routes...
4627 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4629 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4630 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4633 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4639 if (session
[s
].ip_pool_index
== -1) // static IP
4641 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4643 else // It's part of the IP pool, remove it manually.
4644 uncache_ipmap(session
[s
].ip
);
4649 // add new routes...
4650 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4652 if ((new->ip
& new->route
[i
].mask
) ==
4653 (new->route
[i
].ip
& new->route
[i
].mask
))
4656 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4662 // If there's a new one, add it.
4663 if (new->ip_pool_index
== -1)
4665 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4668 cache_ipmap(new->ip
, s
);
4673 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
4674 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4677 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4679 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4683 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4685 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4686 new->filter_out
= 0;
4689 if (new->filter_in
!= session
[s
].filter_in
)
4691 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4692 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4695 if (new->filter_out
!= session
[s
].filter_out
)
4697 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4698 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4701 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4702 // for walking the sessions to forward byte counts to the master.
4703 config
->cluster_highest_sessionid
= s
;
4705 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4707 // Do fixups into address pool.
4708 if (new->ip_pool_index
!= -1)
4709 fix_address_pool(s
);
4714 static void initplugins()
4718 loaded_plugins
= ll_init();
4719 // Initialize the plugins to nothing
4720 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4721 plugins
[i
] = ll_init();
4724 static void *open_plugin(char *plugin_name
, int load
)
4726 char path
[256] = "";
4728 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4729 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4730 return dlopen(path
, RTLD_NOW
);
4733 // plugin callback to get a config value
4734 static void *getconfig(char *key
, enum config_typet type
)
4738 for (i
= 0; config_values
[i
].key
; i
++)
4740 if (!strcmp(config_values
[i
].key
, key
))
4742 if (config_values
[i
].type
== type
)
4743 return ((void *) config
) + config_values
[i
].offset
;
4745 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4746 key
, type
, config_values
[i
].type
);
4752 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4756 static int add_plugin(char *plugin_name
)
4758 static struct pluginfuncs funcs
= {
4763 sessiontbysessionidt
,
4764 sessionidtbysessiont
,
4771 cluster_send_session
,
4774 void *p
= open_plugin(plugin_name
, 1);
4775 int (*initfunc
)(struct pluginfuncs
*);
4780 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4784 if (ll_contains(loaded_plugins
, p
))
4787 return 0; // already loaded
4791 int *v
= dlsym(p
, "plugin_api_version");
4792 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4794 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4800 if ((initfunc
= dlsym(p
, "plugin_init")))
4802 if (!initfunc(&funcs
))
4804 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4810 ll_push(loaded_plugins
, p
);
4812 for (i
= 0; i
< max_plugin_functions
; i
++)
4815 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4817 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4818 ll_push(plugins
[i
], x
);
4822 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4826 static void run_plugin_done(void *plugin
)
4828 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4834 static int remove_plugin(char *plugin_name
)
4836 void *p
= open_plugin(plugin_name
, 0);
4842 if (ll_contains(loaded_plugins
, p
))
4845 for (i
= 0; i
< max_plugin_functions
; i
++)
4848 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4849 ll_delete(plugins
[i
], x
);
4852 ll_delete(loaded_plugins
, p
);
4858 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4862 int run_plugins(int plugin_type
, void *data
)
4864 int (*func
)(void *data
);
4866 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4867 return PLUGIN_RET_ERROR
;
4869 ll_reset(plugins
[plugin_type
]);
4870 while ((func
= ll_next(plugins
[plugin_type
])))
4874 if (r
!= PLUGIN_RET_OK
)
4875 return r
; // stop here
4878 return PLUGIN_RET_OK
;
4881 static void plugins_done()
4885 ll_reset(loaded_plugins
);
4886 while ((p
= ll_next(loaded_plugins
)))
4890 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
4892 struct nsctl request
;
4893 struct nsctl response
;
4894 int type
= unpack_control(&request
, buf
, len
);
4898 if (log_stream
&& config
->debug
>= 4)
4902 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4903 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4907 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4908 dump_control(&request
, log_stream
);
4914 case NSCTL_REQ_LOAD
:
4915 if (request
.argc
!= 1)
4917 response
.type
= NSCTL_RES_ERR
;
4919 response
.argv
[0] = "name of plugin required";
4921 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4923 response
.type
= NSCTL_RES_ERR
;
4925 response
.argv
[0] = !r
4926 ? "plugin already loaded"
4927 : "error loading plugin";
4931 response
.type
= NSCTL_RES_OK
;
4937 case NSCTL_REQ_UNLOAD
:
4938 if (request
.argc
!= 1)
4940 response
.type
= NSCTL_RES_ERR
;
4942 response
.argv
[0] = "name of plugin required";
4944 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4946 response
.type
= NSCTL_RES_ERR
;
4948 response
.argv
[0] = !r
4949 ? "plugin not loaded"
4950 : "plugin not found";
4954 response
.type
= NSCTL_RES_OK
;
4960 case NSCTL_REQ_HELP
:
4961 response
.type
= NSCTL_RES_OK
;
4964 ll_reset(loaded_plugins
);
4965 while ((p
= ll_next(loaded_plugins
)))
4967 char **help
= dlsym(p
, "plugin_control_help");
4968 while (response
.argc
< 0xff && help
&& *help
)
4969 response
.argv
[response
.argc
++] = *help
++;
4974 case NSCTL_REQ_CONTROL
:
4976 struct param_control param
= {
4977 config
->cluster_iam_master
,
4984 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4986 if (r
== PLUGIN_RET_ERROR
)
4988 response
.type
= NSCTL_RES_ERR
;
4990 response
.argv
[0] = param
.additional
4992 : "error returned by plugin";
4994 else if (r
== PLUGIN_RET_NOTMASTER
)
4996 static char msg
[] = "must be run on master: 000.000.000.000";
4998 response
.type
= NSCTL_RES_ERR
;
5000 if (config
->cluster_master_address
)
5002 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
5003 response
.argv
[0] = msg
;
5007 response
.argv
[0] = "must be run on master: none elected";
5010 else if (!(param
.response
& NSCTL_RESPONSE
))
5012 response
.type
= NSCTL_RES_ERR
;
5014 response
.argv
[0] = param
.response
5015 ? "unrecognised response value from plugin"
5016 : "unhandled action";
5020 response
.type
= param
.response
;
5022 if (param
.additional
)
5025 response
.argv
[0] = param
.additional
;
5033 response
.type
= NSCTL_RES_ERR
;
5035 response
.argv
[0] = "error unpacking control packet";
5038 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
5041 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5045 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
5048 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
5049 if (log_stream
&& config
->debug
>= 4)
5051 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5052 dump_control(&response
, log_stream
);
5056 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5057 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
5062 static tunnelidt
new_tunnel()
5065 for (i
= 1; i
< MAXTUNNEL
; i
++)
5067 if (tunnel
[i
].state
== TUNNELFREE
)
5069 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
5070 if (i
> config
->cluster_highest_tunnelid
)
5071 config
->cluster_highest_tunnelid
= i
;
5075 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5080 // We're becoming the master. Do any required setup..
5082 // This is principally telling all the plugins that we're
5083 // now a master, and telling them about all the sessions
5084 // that are active too..
5086 void become_master(void)
5089 static struct event_data d
[RADIUS_FDS
];
5090 struct epoll_event e
;
5092 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
5094 // running a bunch of iptables commands is slow and can cause
5095 // the master to drop tunnels on takeover--kludge around the
5096 // problem by forking for the moment (note: race)
5097 if (!fork_and_close())
5099 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5101 if (!session
[s
].opened
) // Not an in-use session.
5104 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5111 for (i
= 0; i
< RADIUS_FDS
; i
++)
5113 d
[i
].type
= FD_TYPE_RADIUS
;
5117 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5121 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5127 if (CLI_HELP_REQUESTED
)
5128 return CLI_HELP_NO_ARGS
;
5131 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5133 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5136 if (!session
[s
].opened
)
5139 idle
= time_now
- session
[s
].last_packet
;
5140 idle
/= 5 ; // In multiples of 5 seconds.
5150 for (i
= 0; i
< 63; ++i
)
5152 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5154 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5155 cli_print(cli
, "%d total sessions open.", count
);
5159 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5165 if (CLI_HELP_REQUESTED
)
5166 return CLI_HELP_NO_ARGS
;
5169 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5171 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5174 if (!session
[s
].opened
)
5177 d
= time_now
- session
[s
].opened
;
5180 while (d
> 1 && open
< 32)
5190 for (i
= 0; i
< 30; ++i
)
5192 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5195 cli_print(cli
, "%d total sessions open.", count
);
5201 * This unencodes the AVP using the L2TP secret and the previously
5202 * stored random vector. It overwrites the hidden data with the
5203 * unhidden AVP subformat.
5205 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5211 uint16_t m
= htons(type
);
5213 // Compute initial pad
5215 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5216 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5217 MD5_Update(&ctx
, vector
, vec_len
);
5218 MD5_Final(digest
, &ctx
);
5220 // pointer to last decoded 16 octets
5225 // calculate a new pad based on the last decoded block
5226 if (d
>= sizeof(digest
))
5229 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5230 MD5_Update(&ctx
, last
, sizeof(digest
));
5231 MD5_Final(digest
, &ctx
);
5237 *value
++ ^= digest
[d
++];
5242 int find_filter(char const *name
, size_t len
)
5247 for (i
= 0; i
< MAXFILTER
; i
++)
5249 if (!*ip_filters
[i
].name
)
5257 if (strlen(ip_filters
[i
].name
) != len
)
5260 if (!strncmp(ip_filters
[i
].name
, name
, len
))
5267 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
5271 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
5272 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
5273 case FILTER_PORT_OP_GT
: return port
> p
->port
;
5274 case FILTER_PORT_OP_LT
: return port
< p
->port
;
5275 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
5281 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
5285 case FILTER_FLAG_OP_ANY
:
5286 return (flags
& sflags
) || (~flags
& cflags
);
5288 case FILTER_FLAG_OP_ALL
:
5289 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
5291 case FILTER_FLAG_OP_EST
:
5292 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
5298 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
5300 uint16_t frag_offset
;
5304 uint16_t src_port
= 0;
5305 uint16_t dst_port
= 0;
5307 ip_filter_rulet
*rule
;
5309 if (len
< 20) // up to end of destination address
5312 if ((*buf
>> 4) != 4) // IPv4
5315 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
5317 src_ip
= *(in_addr_t
*) (buf
+ 12);
5318 dst_ip
= *(in_addr_t
*) (buf
+ 16);
5320 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
5322 int l
= (buf
[0] & 0xf) * 4; // length of IP header
5323 if (len
< l
+ 4) // ports
5326 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
5327 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
5328 if (proto
== IPPROTO_TCP
)
5330 if (len
< l
+ 14) // flags
5333 flags
= buf
[l
+ 13] & 0x3f;
5337 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
5339 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
5342 if (rule
->src_wild
!= INADDR_BROADCAST
&&
5343 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
5346 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
5347 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5352 // layer 4 deny rules are skipped
5353 if (rule
->action
== FILTER_ACTION_DENY
&&
5354 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
5362 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5364 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5367 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5370 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5371 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5378 return rule
->action
== FILTER_ACTION_PERMIT
;