3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
11 #include <linux/if_tun.h>
16 #include <net/route.h>
19 #include <netinet/in.h>
20 #include <netinet/ip6.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
29 #include <sys/resource.h>
37 #include <sys/sysinfo.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
48 #include "constants.h"
61 char * Vendor_name
= "Linux L2TPNS";
62 uint32_t call_serial_number
= 0;
65 configt
*config
= NULL
; // all configuration
66 int nlfd
= -1; // netlink socket
67 int tunfd
= -1; // tun interface file handle. (network device)
68 int udpfd
[MAX_UDPFD
+ 1] = INIT_TABUDPFD
; // array UDP file handle + 1 for lac udp
69 int udplacfd
= -1; // UDP LAC file handle
70 int controlfd
= -1; // Control signal handle
71 int clifd
= -1; // Socket listening for CLI connections.
72 int daefd
= -1; // Socket listening for DAE connections.
73 int snoopfd
= -1; // UDP file handle for sending out intercept data
74 int *radfds
= NULL
; // RADIUS requests file handles
75 int rand_fd
= -1; // Random data source
76 int cluster_sockfd
= -1; // Intra-cluster communications socket.
77 int epollfd
= -1; // event polling
78 time_t basetime
= 0; // base clock
79 char hostname
[MAXHOSTNAME
] = ""; // us.
80 static int tunidx
; // ifr_ifindex of tun device
81 int nlseqnum
= 0; // netlink sequence number
82 int min_initok_nlseqnum
= 0; // minimun seq number for messages after init is ok
83 static int syslog_log
= 0; // are we logging to syslog
84 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
85 uint32_t last_id
= 0; // Unique ID for radius accounting
87 char guest_users
[10][32]; // Array of guest users
88 int guest_accounts_num
= 0; // Number of guest users
90 // calculated from config->l2tp_mtu
91 uint16_t MRU
= 0; // PPP MRU
92 uint16_t MSS
= 0; // TCP MSS
94 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
95 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
100 } ip_hash
[256]; // Mapping from IP address to session structures.
104 struct ipv6radix
*branch
;
105 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
108 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
109 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
112 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
113 time_t time_now
= 0; // Current time in seconds since epoch.
114 uint64_t time_now_ms
= 0; // Current time in milliseconds since epoch.
115 static char time_now_string
[64] = {0}; // Current time as a string.
116 static int time_changed
= 0; // time_now changed
117 char main_quit
= 0; // True if we're in the process of exiting.
118 static char main_reload
= 0; // Re-load pending
119 linked_list
*loaded_plugins
;
120 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
122 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
123 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
125 config_descriptt config_values
[] = {
126 CONFIG("debug", debug
, INT
),
127 CONFIG("log_file", log_filename
, STRING
),
128 CONFIG("pid_file", pid_file
, STRING
),
129 CONFIG("random_device", random_device
, STRING
),
130 CONFIG("l2tp_secret", l2tp_secret
, STRING
),
131 CONFIG("l2tp_mtu", l2tp_mtu
, INT
),
132 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
133 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
134 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
135 CONFIG("primary_dns", default_dns1
, IPv4
),
136 CONFIG("secondary_dns", default_dns2
, IPv4
),
137 CONFIG("primary_radius", radiusserver
[0], IPv4
),
138 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
139 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
140 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
141 CONFIG("radius_accounting", radius_accounting
, BOOL
),
142 CONFIG("radius_interim", radius_interim
, INT
),
143 CONFIG("radius_secret", radiussecret
, STRING
),
144 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
145 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
146 CONFIG("radius_bind_min", radius_bind_min
, SHORT
),
147 CONFIG("radius_bind_max", radius_bind_max
, SHORT
),
148 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
149 CONFIG("kill_timedout_sessions", kill_timedout_sessions
, BOOL
),
150 CONFIG("guest_account", guest_user
, STRING
),
151 CONFIG("bind_address", bind_address
, IPv4
),
152 CONFIG("peer_address", peer_address
, IPv4
),
153 CONFIG("send_garp", send_garp
, BOOL
),
154 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
155 CONFIG("throttle_buckets", num_tbfs
, INT
),
156 CONFIG("accounting_dir", accounting_dir
, STRING
),
157 CONFIG("account_all_origin", account_all_origin
, BOOL
),
158 CONFIG("dump_speed", dump_speed
, BOOL
),
159 CONFIG("multi_read_count", multi_read_count
, INT
),
160 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
161 CONFIG("lock_pages", lock_pages
, BOOL
),
162 CONFIG("icmp_rate", icmp_rate
, INT
),
163 CONFIG("packet_limit", max_packets
, INT
),
164 CONFIG("cluster_address", cluster_address
, IPv4
),
165 CONFIG("cluster_interface", cluster_interface
, STRING
),
166 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl
, INT
),
167 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
168 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
169 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
170 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
171 CONFIG("cli_bind_address", cli_bind_address
, IPv4
),
172 CONFIG("hostname", hostname
, STRING
),
174 CONFIG("nexthop_address", nexthop_address
, IPv4
),
175 CONFIG("nexthop6_address", nexthop6_address
, IPv6
),
177 CONFIG("echo_timeout", echo_timeout
, INT
),
178 CONFIG("idle_echo_timeout", idle_echo_timeout
, INT
),
179 CONFIG("iftun_address", iftun_address
, IPv4
),
180 CONFIG("tundevicename", tundevicename
, STRING
),
181 CONFIG("disable_lac_func", disable_lac_func
, BOOL
),
182 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src
, BOOL
),
183 CONFIG("bind_address_remotelns", bind_address_remotelns
, IPv4
),
184 CONFIG("bind_portremotelns", bind_portremotelns
, SHORT
),
185 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind
, STRING
),
186 CONFIG("pppoe_service_name", pppoe_service_name
, STRING
),
187 CONFIG("pppoe_ac_name", pppoe_ac_name
, STRING
),
188 CONFIG("disable_sending_hello", disable_sending_hello
, BOOL
),
189 CONFIG("disable_no_spoof", disable_no_spoof
, BOOL
),
190 CONFIG("bind_multi_address", bind_multi_address
, STRING
),
191 CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name
, BOOL
),
192 CONFIG("multi_hostname", multi_hostname
, STRING
),
193 CONFIG("no_throttle_local_IP", no_throttle_local_IP
, BOOL
),
194 CONFIG("dhcp6_preferred_lifetime", dhcp6_preferred_lifetime
, INT
),
195 CONFIG("dhcp6_valid_lifetime", dhcp6_valid_lifetime
, INT
),
196 CONFIG("dhcp6_server_duid", dhcp6_server_duid
, INT
),
197 CONFIG("primary_ipv6_dns", default_ipv6_dns1
, IPv6
),
198 CONFIG("secondary_ipv6_dns", default_ipv6_dns2
, IPv6
),
199 CONFIG("default_ipv6_domain_list", default_ipv6_domain_list
, STRING
),
203 static char *plugin_functions
[] = {
208 "plugin_new_session",
209 "plugin_kill_session",
211 "plugin_radius_response",
212 "plugin_radius_reset",
213 "plugin_radius_account",
214 "plugin_become_master",
215 "plugin_new_session_master",
218 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
220 // Counters for shutdown sessions
221 static sessiont shut_acct
[8192];
222 static sessionidt shut_acct_n
= 0;
224 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
225 bundlet
*bundle
= NULL
; // Array of bundle structures.
226 fragmentationt
*frag
= NULL
; // Array of fragmentation structures.
227 sessiont
*session
= NULL
; // Array of session structures.
228 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
229 radiust
*radius
= NULL
; // Array of radius structures.
230 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
231 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
232 static controlt
*controlfree
= 0;
233 struct Tstats
*_statistics
= NULL
;
235 struct Tringbuffer
*ringbuffer
= NULL
;
238 static ssize_t
netlink_send(struct nlmsghdr
*nh
);
239 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
);
240 static void cache_ipmap(in_addr_t ip
, sessionidt s
);
241 static void uncache_ipmap(in_addr_t ip
);
242 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
);
243 static void free_ip_address(sessionidt s
);
244 static void dump_acct_info(int all
);
245 static void sighup_handler(int sig
);
246 static void shutdown_handler(int sig
);
247 static void sigchild_handler(int sig
);
248 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
249 static void update_config(void);
250 static void read_config_file(void);
251 static void initplugins(void);
252 static int add_plugin(char *plugin_name
);
253 static int remove_plugin(char *plugin_name
);
254 static void plugins_done(void);
255 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
);
256 static tunnelidt
new_tunnel(void);
257 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
258 static void bundleclear(bundleidt b
);
260 // return internal time (10ths since process startup), set f if given
261 // as a side-effect sets time_now, and time_changed
262 static clockt
now(double *f
)
266 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
267 if (t
.tv_sec
!= time_now
)
273 // Time in milliseconds
274 // TODO FOR MLPPP DEV
275 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
277 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
280 // work out a retry time based on try number
281 // This is a straight bounded exponential backoff.
282 // Maximum re-try time is 32 seconds. (2^5).
283 clockt
backoff(uint8_t try)
285 if (try > 5) try = 5; // max backoff
286 return now(NULL
) + 10 * (1 << try);
291 // Log a debug message. Typically called via the LOG macro
293 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
295 static char message
[65536] = {0};
301 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
302 ringbuffer
->tail
= 0;
303 if (ringbuffer
->tail
== ringbuffer
->head
)
304 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
305 ringbuffer
->head
= 0;
307 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
308 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
309 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
310 va_start(ap
, format
);
311 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, MAX_LOG_LENGTH
, format
, ap
);
316 if (config
->debug
< level
) return;
318 va_start(ap
, format
);
319 vsnprintf(message
, sizeof(message
), format
, ap
);
322 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
324 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
329 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
332 const uint8_t *d
= data
;
334 if (config
->debug
< level
) return;
336 // No support for _log_hex to syslog
339 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
340 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
342 for (i
= 0; i
< maxsize
; )
344 fprintf(log_stream
, "%4X: ", i
);
345 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
347 fprintf(log_stream
, "%02X ", d
[j
]);
349 fputs(": ", log_stream
);
352 for (; j
< i
+ 16; j
++)
354 fputs(" ", log_stream
);
356 fputs(": ", log_stream
);
359 fputs(" ", log_stream
);
360 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
362 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
363 fputc(d
[j
], log_stream
);
365 fputc('.', log_stream
);
368 fputs(" ", log_stream
);
372 fputs("\n", log_stream
);
376 setbuf(log_stream
, NULL
);
380 // update a counter, accumulating 2^32 wraps
381 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
383 uint32_t new = *counter
+ delta
;
390 // initialise the random generator
391 static void initrandom(char *source
)
393 static char path
[sizeof(config
->random_device
)] = "*undefined*";
395 // reinitialise only if we are forced to do so or if the config has changed
396 if (source
&& !strncmp(path
, source
, sizeof(path
)))
399 // close previous source, if any
408 snprintf(path
, sizeof(path
), "%s", source
);
412 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
414 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
415 path
, strerror(errno
));
420 // fill buffer with random data
421 void random_data(uint8_t *buf
, int len
)
428 n
= read(rand_fd
, buf
, len
);
429 if (n
>= len
) return;
434 LOG(0, 0, 0, "Error reading from random source: %s\n",
437 // fall back to rand()
445 // append missing data
447 // not using the low order bits from the prng stream
448 buf
[n
++] = (rand() >> 4) & 0xff;
453 // This adds it to the routing table, advertises it
454 // via BGP if enabled, and stuffs it into the
455 // 'sessionbyip' cache.
457 // 'ip' must be in _host_ order.
459 static void routeset(sessionidt s
, in_addr_t ip
, int prefixlen
, in_addr_t gw
, int add
)
469 if (!prefixlen
) prefixlen
= 32;
471 ip
&= 0xffffffff << (32 - prefixlen
);; // Force the ip to be the first one in the route.
473 memset(&req
, 0, sizeof(req
));
477 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
478 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
482 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
483 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
486 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
488 req
.rt
.rtm_family
= AF_INET
;
489 req
.rt
.rtm_dst_len
= prefixlen
;
490 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
491 req
.rt
.rtm_protocol
= 42;
492 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
493 req
.rt
.rtm_type
= RTN_UNICAST
;
495 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
497 netlink_addattr(&req
.nh
, RTA_DST
, &n_ip
, sizeof(n_ip
));
501 netlink_addattr(&req
.nh
, RTA_GATEWAY
, &n_ip
, sizeof(n_ip
));
504 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d%s%s\n", add
? "add" : "del",
505 fmtaddr(htonl(ip
), 0), prefixlen
,
506 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
508 if (netlink_send(&req
.nh
) < 0)
509 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno
));
513 bgp_add_route(htonl(ip
), prefixlen
);
515 bgp_del_route(htonl(ip
), prefixlen
);
518 // Add/Remove the IPs to the 'sessionbyip' cache.
519 // Note that we add the zero address in the case of
520 // a network route. Roll on CIDR.
522 // Note that 's == 0' implies this is the address pool.
523 // We still cache it here, because it will pre-fill
524 // the malloc'ed tree.
528 if (!add
) // Are we deleting a route?
529 s
= 0; // Caching the session as '0' is the same as uncaching.
531 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
536 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
544 char ipv6addr
[INET6_ADDRSTRLEN
];
546 if (!config
->ipv6_prefix
.s6_addr
[0])
548 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
552 memset(&req
, 0, sizeof(req
));
556 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
557 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
561 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
562 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
565 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
567 req
.rt
.rtm_family
= AF_INET6
;
568 req
.rt
.rtm_dst_len
= prefixlen
;
569 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
570 req
.rt
.rtm_protocol
= 42;
571 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
572 req
.rt
.rtm_type
= RTN_UNICAST
;
574 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
575 netlink_addattr(&req
.nh
, RTA_DST
, &ip
, sizeof(ip
));
577 netlink_addattr(&req
.nh
, RTA_METRICS
, &metric
, sizeof(metric
));
579 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d\n",
581 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
584 if (netlink_send(&req
.nh
) < 0)
585 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno
));
589 bgp_add_route6(ip
, prefixlen
);
591 bgp_del_route6(ip
, prefixlen
);
596 if (!add
) // Are we deleting a route?
597 s
= 0; // Caching the session as '0' is the same as uncaching.
599 cache_ipv6map(ip
, prefixlen
, s
);
606 // Set up netlink socket
607 static void initnetlink(void)
609 struct sockaddr_nl nladdr
;
611 nlfd
= socket(AF_NETLINK
, SOCK_RAW
, NETLINK_ROUTE
);
614 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno
));
618 memset(&nladdr
, 0, sizeof(nladdr
));
619 nladdr
.nl_family
= AF_NETLINK
;
620 nladdr
.nl_pid
= getpid();
622 if (bind(nlfd
, (struct sockaddr
*)&nladdr
, sizeof(nladdr
)) < 0)
624 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno
));
629 static ssize_t
netlink_send(struct nlmsghdr
*nh
)
631 struct sockaddr_nl nladdr
;
635 nh
->nlmsg_pid
= getpid();
636 nh
->nlmsg_seq
= ++nlseqnum
;
638 // set kernel address
639 memset(&nladdr
, 0, sizeof(nladdr
));
640 nladdr
.nl_family
= AF_NETLINK
;
642 iov
= (struct iovec
){ (void *)nh
, nh
->nlmsg_len
};
643 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
645 return sendmsg(nlfd
, &msg
, 0);
648 static ssize_t
netlink_recv(void *buf
, ssize_t len
)
650 struct sockaddr_nl nladdr
;
654 // set kernel address
655 memset(&nladdr
, 0, sizeof(nladdr
));
656 nladdr
.nl_family
= AF_NETLINK
;
658 iov
= (struct iovec
){ buf
, len
};
659 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
661 return recvmsg(nlfd
, &msg
, 0);
664 /* adapted from iproute2 */
665 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
)
667 int len
= RTA_LENGTH(alen
);
670 rta
= (struct rtattr
*)(((void *)nh
) + NLMSG_ALIGN(nh
->nlmsg_len
));
671 rta
->rta_type
= type
;
673 memcpy(RTA_DATA(rta
), data
, alen
);
674 nh
->nlmsg_len
= NLMSG_ALIGN(nh
->nlmsg_len
) + RTA_ALIGN(len
);
677 // messages corresponding to different phases seq number
678 static char *tun_nl_phase_msg
[] = {
680 "getting tun interface index",
681 "setting tun interface parameters",
682 "setting tun IPv4 address",
683 "setting tun LL IPv6 address",
684 "setting tun global IPv6 address",
688 // Set up TUN interface
689 static void inittun(void)
693 memset(&ifr
, 0, sizeof(ifr
));
694 ifr
.ifr_flags
= IFF_TUN
;
696 tunfd
= open(TUNDEVICE
, O_RDWR
);
699 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
703 int flags
= fcntl(tunfd
, F_GETFL
, 0);
704 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
707 if (*config
->tundevicename
)
708 strncpy(ifr
.ifr_name
, config
->tundevicename
, IFNAMSIZ
);
710 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
712 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
715 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevicename
) - 1);
716 strncpy(config
->tundevicename
, ifr
.ifr_name
, sizeof(config
->tundevicename
));
718 tunidx
= if_nametoindex(config
->tundevicename
);
721 LOG(0, 0, 0, "Can't get tun interface index\n");
730 struct ifinfomsg ifinfo
;
731 struct ifaddrmsg ifaddr
;
733 char rtdata
[32]; // 32 should be enough
735 uint32_t txqlen
, mtu
;
738 memset(&req
, 0, sizeof(req
));
740 req
.nh
.nlmsg_type
= RTM_NEWLINK
;
741 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_MULTI
;
742 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifinfo
));
744 req
.ifmsg
.ifinfo
.ifi_family
= AF_UNSPEC
;
745 req
.ifmsg
.ifinfo
.ifi_index
= tunidx
;
746 req
.ifmsg
.ifinfo
.ifi_flags
|= IFF_UP
; // set interface up
747 req
.ifmsg
.ifinfo
.ifi_change
= IFF_UP
; // only change this flag
749 /* Bump up the qlen to deal with bursts from the network */
751 netlink_addattr(&req
.nh
, IFLA_TXQLEN
, &txqlen
, sizeof(txqlen
));
752 /* set MTU to modem MRU */
754 netlink_addattr(&req
.nh
, IFLA_MTU
, &mtu
, sizeof(mtu
));
756 if (netlink_send(&req
.nh
) < 0)
759 memset(&req
, 0, sizeof(req
));
761 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
762 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
763 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
765 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET
;
766 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 32;
767 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
768 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
770 if (config
->nbmultiaddress
> 1)
773 for (i
= 0; i
< config
->nbmultiaddress
; i
++)
775 ip
= config
->iftun_n_address
[i
];
776 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
777 if (netlink_send(&req
.nh
) < 0)
783 if (config
->iftun_address
)
784 ip
= config
->iftun_address
;
786 ip
= 0x01010101; // 1.1.1.1
787 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
789 if (netlink_send(&req
.nh
) < 0)
795 // Only setup IPv6 on the tun device if we have a configured prefix
796 if (config
->ipv6_prefix
.s6_addr
[0]) {
799 memset(&req
, 0, sizeof(req
));
801 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
802 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
803 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
805 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
806 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
807 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_LINK
;
808 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
810 // Link local address is FE80::1
811 memset(&ip6
, 0, sizeof(ip6
));
812 ip6
.s6_addr
[0] = 0xFE;
813 ip6
.s6_addr
[1] = 0x80;
815 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
817 if (netlink_send(&req
.nh
) < 0)
820 memset(&req
, 0, sizeof(req
));
822 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
823 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
824 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
826 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
827 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
828 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
829 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
831 // Global address is prefix::1
832 ip6
= config
->ipv6_prefix
;
834 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
836 if (netlink_send(&req
.nh
) < 0)
840 memset(&req
, 0, sizeof(req
));
842 req
.nh
.nlmsg_type
= NLMSG_DONE
;
843 req
.nh
.nlmsg_len
= NLMSG_LENGTH(0);
845 if (netlink_send(&req
.nh
) < 0)
848 // if we get an error for seqnum < min_initok_nlseqnum,
849 // we must exit as initialization went wrong
850 if (config
->ipv6_prefix
.s6_addr
[0])
851 min_initok_nlseqnum
= 5 + 1; // idx + if + addr + 2*addr6
853 min_initok_nlseqnum
= 3 + 1; // idx + if + addr
859 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno
));
863 // set up LAC UDP ports
864 static void initlacudp(void)
867 struct sockaddr_in addr
;
869 // Tunnel to Remote LNS
870 memset(&addr
, 0, sizeof(addr
));
871 addr
.sin_family
= AF_INET
;
872 addr
.sin_port
= htons(config
->bind_portremotelns
);
873 addr
.sin_addr
.s_addr
= config
->bind_address_remotelns
;
874 udplacfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
875 setsockopt(udplacfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
877 int flags
= fcntl(udplacfd
, F_GETFL
, 0);
878 fcntl(udplacfd
, F_SETFL
, flags
| O_NONBLOCK
);
880 if (bind(udplacfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
882 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno
));
887 // set up control ports
888 static void initcontrol(void)
891 struct sockaddr_in addr
;
894 memset(&addr
, 0, sizeof(addr
));
895 addr
.sin_family
= AF_INET
;
896 addr
.sin_port
= htons(NSCTL_PORT
);
897 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
898 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
899 setsockopt(controlfd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
900 if (bind(controlfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
902 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
907 // set up Dynamic Authorization Extensions to RADIUS port
908 static void initdae(void)
911 struct sockaddr_in addr
;
913 // Dynamic Authorization Extensions to RADIUS
914 memset(&addr
, 0, sizeof(addr
));
915 addr
.sin_family
= AF_INET
;
916 addr
.sin_port
= htons(config
->radius_dae_port
);
917 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
918 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
919 setsockopt(daefd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
920 if (bind(daefd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
922 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
928 static void initudp(int * pudpfd
, in_addr_t ip_bind
)
931 struct sockaddr_in addr
;
934 memset(&addr
, 0, sizeof(addr
));
935 addr
.sin_family
= AF_INET
;
936 addr
.sin_port
= htons(L2TPPORT
);
937 addr
.sin_addr
.s_addr
= ip_bind
;
938 (*pudpfd
) = socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
939 setsockopt((*pudpfd
), SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
941 int flags
= fcntl((*pudpfd
), F_GETFL
, 0);
942 fcntl((*pudpfd
), F_SETFL
, flags
| O_NONBLOCK
);
944 if (bind((*pudpfd
), (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
946 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
952 // Find session by IP, < 1 for not found
954 // Confusingly enough, this 'ip' must be
955 // in _network_ order. This being the common
956 // case when looking it up from IP packet headers.
958 // We actually use this cache for two things.
959 // #1. For used IP addresses, this maps to the
960 // session ID that it's used by.
961 // #2. For un-used IP addresses, this maps to the
962 // index into the pool table that contains that
966 static sessionidt
lookup_ipmap(in_addr_t ip
)
968 uint8_t *a
= (uint8_t *) &ip
;
969 union iphash
*h
= ip_hash
;
971 if (!(h
= h
[*a
++].idx
)) return 0;
972 if (!(h
= h
[*a
++].idx
)) return 0;
973 if (!(h
= h
[*a
++].idx
)) return 0;
978 static sessionidt
lookup_ipv6map(struct in6_addr ip
)
980 struct ipv6radix
*curnode
;
983 char ipv6addr
[INET6_ADDRSTRLEN
];
985 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
989 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
991 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
996 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
997 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1004 sessionidt
sessionbyip(in_addr_t ip
)
1006 sessionidt s
= lookup_ipmap(ip
);
1009 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
1015 sessionidt
sessionbyipv6(struct in6_addr ip
)
1018 CSTAT(sessionbyipv6
);
1020 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
1021 (ip
.s6_addr
[0] == 0xFE &&
1022 ip
.s6_addr
[1] == 0x80 &&
1023 ip
.s6_addr16
[1] == 0 &&
1024 ip
.s6_addr16
[2] == 0 &&
1025 ip
.s6_addr16
[3] == 0))
1027 in_addr_t
*pipv4
= (in_addr_t
*) &ip
.s6_addr
[8];
1028 s
= lookup_ipmap(*pipv4
);
1030 s
= lookup_ipv6map(ip
);
1033 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
1040 // Take an IP address in HOST byte order and
1041 // add it to the sessionid by IP cache.
1043 // (It's actually cached in network order)
1045 static void cache_ipmap(in_addr_t ip
, sessionidt s
)
1047 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1048 uint8_t *a
= (uint8_t *) &nip
;
1049 union iphash
*h
= ip_hash
;
1052 for (i
= 0; i
< 3; i
++)
1054 if (!(h
[a
[i
]].idx
|| (h
[a
[i
]].idx
= calloc(256, sizeof(union iphash
)))))
1063 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
1066 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
1067 // else a map to an ip pool index.
1070 static void uncache_ipmap(in_addr_t ip
)
1072 cache_ipmap(ip
, 0); // Assign it to the NULL session.
1075 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
)
1079 struct ipv6radix
*curnode
;
1080 char ipv6addr
[INET6_ADDRSTRLEN
];
1082 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
1084 bytes
= prefixlen
>> 3;
1087 if (curnode
->branch
== NULL
)
1089 if (!(curnode
->branch
= calloc(256,
1090 sizeof (struct ipv6radix
))))
1093 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
1100 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
1101 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1105 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1106 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1112 // CLI list to dump current ipcache.
1114 int cmd_show_ipcache(struct cli_def
*cli
, const char *command
, char **argv
, int argc
)
1116 union iphash
*d
= ip_hash
, *e
, *f
, *g
;
1120 if (CLI_HELP_REQUESTED
)
1121 return CLI_HELP_NO_ARGS
;
1123 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
1125 for (i
= 0; i
< 256; ++i
)
1131 for (j
= 0; j
< 256; ++j
)
1137 for (k
= 0; k
< 256; ++k
)
1143 for (l
= 0; l
< 256; ++l
)
1148 cli_print(cli
, "%7d %d.%d.%d.%d", g
[l
].sess
, i
, j
, k
, l
);
1154 cli_print(cli
, "%d entries in cache", count
);
1159 // Find session by username, 0 for not found
1160 // walled garden users aren't authenticated, so the username is
1161 // reasonably useless. Ignore them to avoid incorrect actions
1163 // This is VERY inefficent. Don't call it often. :)
1165 sessionidt
sessionbyuser(char *username
)
1168 CSTAT(sessionbyuser
);
1170 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1172 if (!session
[s
].opened
)
1175 if (session
[s
].walled_garden
)
1176 continue; // Skip walled garden users.
1178 if (!strncmp(session
[s
].user
, username
, 128))
1182 return 0; // Not found.
1185 void send_garp(in_addr_t ip
)
1191 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
1194 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
1197 memset(&ifr
, 0, sizeof(ifr
));
1198 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
1199 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
1201 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
1205 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
1206 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
1208 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
1213 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
1216 static sessiont
*sessiontbysessionidt(sessionidt s
)
1218 if (!s
|| s
>= MAXSESSION
) return NULL
;
1222 static sessionidt
sessionidtbysessiont(sessiont
*s
)
1224 sessionidt val
= s
-session
;
1225 if (s
< session
|| val
>= MAXSESSION
) return 0;
1229 // actually send a control message for a specific tunnel
1230 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
1232 struct sockaddr_in addr
;
1238 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
1239 STAT(tunnel_tx_errors
);
1243 if (t
== TUNNEL_ID_PPPOE
)
1245 pppoe_sess_send(buf
, l
, t
);
1251 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1252 STAT(tunnel_tx_errors
);
1256 memset(&addr
, 0, sizeof(addr
));
1257 addr
.sin_family
= AF_INET
;
1258 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
1259 addr
.sin_port
= htons(tunnel
[t
].port
);
1261 // sequence expected, if sequence in message
1262 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
1264 // If this is a control message, deal with retries
1267 tunnel
[t
].last
= time_now
; // control message sent
1268 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
1271 STAT(tunnel_retries
);
1272 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
1276 if (sendto(udpfd
[tunnel
[t
].indexudp
], buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1278 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1279 strerror(errno
), udpfd
[tunnel
[t
].indexudp
], buf
, l
, inet_ntoa(addr
.sin_addr
));
1280 STAT(tunnel_tx_errors
);
1284 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
1285 STAT(tunnel_tx_packets
);
1286 INC_STAT(tunnel_tx_bytes
, l
);
1290 // Tiny helper function to write data to
1291 // the 'tun' device.
1293 int tun_write(uint8_t * data
, int size
)
1295 return write(tunfd
, data
, size
);
1298 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1299 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1301 int d
= (tcp
[12] >> 4) * 4;
1308 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1311 if (tcp
+ d
> buf
+ len
) // short?
1319 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1322 if (mss
+ 2 > data
) return; // short?
1326 if (*opts
== 0) return; // end of options
1327 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1330 opts
+= opts
[1]; // skip over option
1333 if (!mss
) return; // not found
1334 orig
= ntohs(*(uint16_t *) mss
);
1336 if (orig
<= MSS
) return; // mss OK
1338 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1339 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1340 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1341 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1344 *(int16_t *) mss
= htons(MSS
);
1346 // adjust checksum (see rfc1141)
1347 sum
= orig
+ (~MSS
& 0xffff);
1348 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1349 sum
= (sum
& 0xffff) + (sum
>> 16);
1350 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1353 void processmpframe(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint8_t extra
)
1357 // Skip the four extra bytes
1369 proto
= ntohs(*(uint16_t *) p
);
1377 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1378 return; // closing session, PPP not processed
1380 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1381 processipin(s
, t
, p
, l
);
1383 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
1387 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1388 return; // closing session, PPP not processed
1391 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1392 processipv6in(s
, t
, p
, l
);
1394 else if (proto
== PPPIPCP
)
1396 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1397 processipcp(s
, t
, p
, l
);
1399 else if (proto
== PPPCCP
)
1401 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1402 processccp(s
, t
, p
, l
);
1406 LOG(2, s
, t
, "MPPP: Unsupported MP protocol 0x%04X received\n",proto
);
1410 static void update_session_out_stat(sessionidt s
, sessiont
*sp
, int len
)
1412 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1413 sp
->cout_delta
+= len
;
1415 sp
->last_data
= time_now
;
1417 sess_local
[s
].cout
+= len
; // To send to master..
1418 sess_local
[s
].pout
++;
1421 // process outgoing (to tunnel) IP
1423 // (i.e. this routine writes to data[-8]).
1424 void processipout(uint8_t *buf
, int len
)
1429 in_addr_t ip
, ip_src
;
1431 uint8_t *data
= buf
; // Keep a copy of the originals.
1434 uint8_t fragbuf
[MAXETHER
+ 20];
1436 CSTAT(processipout
);
1438 if (len
< MIN_IP_SIZE
)
1440 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1441 STAT(tun_rx_errors
);
1444 if (len
>= MAXETHER
)
1446 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1447 STAT(tun_rx_errors
);
1451 // Skip the tun header
1455 // Got an IP header now
1456 if (*(uint8_t *)(buf
) >> 4 != 4)
1458 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1462 ip_src
= *(uint32_t *)(buf
+ 12);
1463 ip
= *(uint32_t *)(buf
+ 16);
1464 if (!(s
= sessionbyip(ip
)))
1466 // Is this a packet for a session that doesn't exist?
1467 static int rate
= 0; // Number of ICMP packets we've sent this second.
1468 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1470 if (last
!= time_now
)
1476 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1478 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1479 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1480 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1485 t
= session
[s
].tunnel
;
1486 if (len
> session
[s
].mru
|| (session
[s
].mrru
&& len
> session
[s
].mrru
))
1488 LOG(3, s
, t
, "Packet size more than session MRU\n");
1494 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1495 if (config
->max_packets
> 0)
1497 if (sess_local
[s
].last_packet_out
== TIME
)
1499 int max
= config
->max_packets
;
1501 // All packets for throttled sessions are handled by the
1502 // master, so further limit by using the throttle rate.
1503 // A bit of a kludge, since throttle rate is in kbps,
1504 // but should still be generous given our average DSL
1505 // packet size is 200 bytes: a limit of 28kbps equates
1506 // to around 180 packets per second.
1507 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1508 max
= sp
->throttle_out
;
1510 if (++sess_local
[s
].packets_out
> max
)
1512 sess_local
[s
].packets_dropped
++;
1518 if (sess_local
[s
].packets_dropped
)
1520 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1521 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1522 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1523 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1527 sess_local
[s
].last_packet_out
= TIME
;
1528 sess_local
[s
].packets_out
= 1;
1529 sess_local
[s
].packets_dropped
= 0;
1533 // run access-list if any
1534 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1537 // adjust MSS on SYN and SYN,ACK packets with options
1538 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1540 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1541 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1542 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1547 if (!config
->no_throttle_local_IP
|| !sessionbyip(ip_src
))
1549 // Are we throttling this session?
1550 if (config
->cluster_iam_master
)
1551 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1553 master_throttle_packet(sp
->tbf_out
, data
, size
);
1558 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1560 // We are walled-gardening this
1561 master_garden_packet(s
, data
, size
);
1565 if(session
[s
].bundle
!= 0 && bundle
[session
[s
].bundle
].num_of_links
> 1)
1568 if (!config
->cluster_iam_master
)
1570 // The MPPP packets must be managed by the Master.
1571 master_forward_mppp_packet(s
, data
, size
);
1575 // Add on L2TP header
1576 sessionidt members
[MAXBUNDLESES
];
1577 bundleidt bid
= session
[s
].bundle
;
1578 bundlet
*b
= &bundle
[bid
];
1579 uint32_t num_of_links
, nb_opened
;
1582 num_of_links
= b
->num_of_links
;
1584 for (i
= 0;i
< num_of_links
;i
++)
1587 if (session
[s
].ppp
.lcp
== Opened
)
1589 members
[nb_opened
] = s
;
1596 LOG(3, s
, t
, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid
);
1600 num_of_links
= nb_opened
;
1601 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1602 s
= members
[b
->current_ses
];
1603 t
= session
[s
].tunnel
;
1605 LOG(4, s
, t
, "MPPP: (1)Session number becomes: %d\n", s
);
1607 if (num_of_links
> 1)
1609 if(len
> MINFRAGLEN
)
1611 //for rotate traffic among the member links
1612 uint32_t divisor
= num_of_links
;
1614 divisor
= divisor
/2 + (divisor
& 1);
1616 // Partition the packet to "num_of_links" fragments
1617 uint32_t fraglen
= len
/ divisor
;
1618 uint32_t last_fraglen
= fraglen
+ len
% divisor
;
1619 uint32_t remain
= len
;
1621 // send the first packet
1622 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, fraglen
, s
, t
, PPPIP
, 0, bid
, MP_BEGIN
);
1624 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1627 update_session_out_stat(s
, sp
, fraglen
);
1630 while (remain
> last_fraglen
)
1632 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1633 s
= members
[b
->current_ses
];
1634 t
= session
[s
].tunnel
;
1636 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1637 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), fraglen
, s
, t
, PPPIP
, 0, bid
, 0);
1639 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1640 update_session_out_stat(s
, sp
, fraglen
);
1643 // send the last fragment
1644 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1645 s
= members
[b
->current_ses
];
1646 t
= session
[s
].tunnel
;
1648 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1649 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), remain
, s
, t
, PPPIP
, 0, bid
, MP_END
);
1651 tunnelsend(fragbuf
, remain
+ (p
-fragbuf
), t
); // send it...
1652 update_session_out_stat(s
, sp
, remain
);
1653 if (remain
!= last_fraglen
)
1654 LOG(3, s
, t
, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain
, last_fraglen
);
1658 // Send it as one frame
1659 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, bid
, MP_BOTH_BITS
);
1661 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1662 LOG(4, s
, t
, "MPPP: packet sent as one frame\n");
1663 update_session_out_stat(s
, sp
, len
);
1668 // Send it as one frame (NO MPPP Frame)
1669 uint8_t *p
= opt_makeppp(buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1670 tunnelsend(p
, len
+ (buf
-p
), t
); // send it...
1671 update_session_out_stat(s
, sp
, len
);
1676 uint8_t *p
= opt_makeppp(buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1677 tunnelsend(p
, len
+ (buf
-p
), t
); // send it...
1678 update_session_out_stat(s
, sp
, len
);
1681 // Snooping this session, send it to intercept box
1682 if (sp
->snoop_ip
&& sp
->snoop_port
)
1683 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1688 // process outgoing (to tunnel) IPv6
1690 static void processipv6out(uint8_t * buf
, int len
)
1696 struct in6_addr ip6
;
1698 uint8_t *data
= buf
; // Keep a copy of the originals.
1701 uint8_t b
[MAXETHER
+ 20];
1703 CSTAT(processipv6out
);
1705 if (len
< MIN_IP_SIZE
)
1707 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1708 STAT(tunnel_tx_errors
);
1711 if (len
>= MAXETHER
)
1713 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1714 STAT(tunnel_tx_errors
);
1718 // Skip the tun header
1722 // Got an IP header now
1723 if (*(uint8_t *)(buf
) >> 4 != 6)
1725 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1729 ip6
= *(struct in6_addr
*)(buf
+24);
1730 s
= sessionbyipv6(ip6
);
1734 ip
= *(uint32_t *)(buf
+ 32);
1735 s
= sessionbyip(ip
);
1740 // Is this a packet for a session that doesn't exist?
1741 static int rate
= 0; // Number of ICMP packets we've sent this second.
1742 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1744 if (last
!= time_now
)
1750 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1752 // FIXME: Should send icmp6 host unreachable
1756 if (session
[s
].bundle
&& bundle
[session
[s
].bundle
].num_of_links
> 1)
1758 bundleidt bid
= session
[s
].bundle
;
1759 bundlet
*b
= &bundle
[bid
];
1761 b
->current_ses
= (b
->current_ses
+ 1) % b
->num_of_links
;
1762 s
= b
->members
[b
->current_ses
];
1763 LOG(3, s
, session
[s
].tunnel
, "MPPP: Session number becomes: %u\n", s
);
1765 t
= session
[s
].tunnel
;
1767 sp
->last_data
= time_now
;
1769 // FIXME: add DoS prevention/filters?
1773 // Are we throttling this session?
1774 if (config
->cluster_iam_master
)
1775 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1777 master_throttle_packet(sp
->tbf_out
, data
, size
);
1780 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1782 // We are walled-gardening this
1783 master_garden_packet(s
, data
, size
);
1787 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1789 // Add on L2TP header
1791 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0);
1793 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1796 // Snooping this session, send it to intercept box
1797 if (sp
->snoop_ip
&& sp
->snoop_port
)
1798 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1800 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1801 sp
->cout_delta
+= len
;
1805 sess_local
[s
].cout
+= len
; // To send to master..
1806 sess_local
[s
].pout
++;
1810 // Helper routine for the TBF filters.
1811 // Used to send queued data in to the user!
1813 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1818 uint8_t *data
= buf
; // Keep a copy of the originals.
1820 uint8_t b
[MAXETHER
+ 20];
1822 if (len
< 0 || len
> MAXETHER
)
1824 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1828 // Skip the tun header
1835 t
= session
[s
].tunnel
;
1838 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1840 // Add on L2TP header
1841 if (*(uint16_t *) (data
+ 2) == htons(PKTIPV6
))
1842 p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0); // IPV6
1844 p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0); // IPV4
1848 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1850 // Snooping this session.
1851 if (sp
->snoop_ip
&& sp
->snoop_port
)
1852 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1854 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1855 sp
->cout_delta
+= len
;
1859 sess_local
[s
].cout
+= len
; // To send to master..
1860 sess_local
[s
].pout
++;
1863 // add an AVP (16 bit)
1864 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1866 uint16_t l
= (m
? 0x8008 : 0x0008);
1867 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1868 pint16
[0] = htons(l
);
1869 pint16
[1] = htons(0);
1870 pint16
[2] = htons(avp
);
1871 pint16
[3] = htons(val
);
1875 // add an AVP (32 bit)
1876 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1878 uint16_t l
= (m
? 0x800A : 0x000A);
1879 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1880 uint32_t *pint32
= (uint32_t *) (c
->buf
+ c
->length
+ 6);
1881 pint16
[0] = htons(l
);
1882 pint16
[1] = htons(0);
1883 pint16
[2] = htons(avp
);
1884 pint32
[0] = htonl(val
);
1888 // add an AVP (string)
1889 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1891 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1892 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1893 pint16
[0] = htons(l
);
1894 pint16
[1] = htons(0);
1895 pint16
[2] = htons(avp
);
1896 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1897 c
->length
+= 6 + strlen(val
);
1901 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1903 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1904 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1905 pint16
[0] = htons(l
);
1906 pint16
[1] = htons(0);
1907 pint16
[2] = htons(avp
);
1908 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1909 c
->length
+= 6 + len
;
1912 // new control connection
1913 static controlt
*controlnew(uint16_t mtype
)
1917 c
= malloc(sizeof(controlt
));
1921 controlfree
= c
->next
;
1925 c
->buf
[0] = 0xC8; // flags
1926 c
->buf
[1] = 0x02; // ver
1928 control16(c
, 0, mtype
, 1);
1932 // send zero block if nothing is waiting
1934 static void controlnull(tunnelidt t
)
1937 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1940 buf
[0] = htons(0xC802); // flags/ver
1941 buf
[1] = htons(12); // length
1942 buf
[2] = htons(tunnel
[t
].far
); // tunnel
1943 buf
[3] = htons(0); // session
1944 buf
[4] = htons(tunnel
[t
].ns
); // sequence
1945 buf
[5] = htons(tunnel
[t
].nr
); // sequence
1946 tunnelsend((uint8_t *)buf
, 12, t
);
1949 // add a control message to a tunnel, and send if within window
1950 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1952 uint16_t *pint16
= (uint16_t *) (c
->buf
+ 2);
1953 pint16
[0] = htons(c
->length
); // length
1954 pint16
[1] = htons(tunnel
[t
].far
); // tunnel
1955 pint16
[2] = htons(far
); // session
1956 pint16
[3] = htons(tunnel
[t
].ns
); // sequence
1957 tunnel
[t
].ns
++; // advance sequence
1958 // link in message in to queue
1959 if (tunnel
[t
].controlc
)
1960 tunnel
[t
].controle
->next
= c
;
1962 tunnel
[t
].controls
= c
;
1964 tunnel
[t
].controle
= c
;
1965 tunnel
[t
].controlc
++;
1967 // send now if space in window
1968 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1970 tunnel
[t
].try = 0; // first send
1971 tunnelsend(c
->buf
, c
->length
, t
);
1976 // Throttle or Unthrottle a session
1978 // Throttle the data from/to through a session to no more than
1979 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1982 // If either value is -1, the current value is retained for that
1985 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1987 if (!session
[s
].opened
)
1988 return; // No-one home.
1990 if (!*session
[s
].user
)
1991 return; // User not logged in
1995 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1996 if (session
[s
].tbf_in
)
1997 free_tbf(session
[s
].tbf_in
);
2000 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
2002 session
[s
].tbf_in
= 0;
2004 session
[s
].throttle_in
= rate_in
;
2009 int bytes
= rate_out
* 1024 / 8;
2010 if (session
[s
].tbf_out
)
2011 free_tbf(session
[s
].tbf_out
);
2014 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
2016 session
[s
].tbf_out
= 0;
2018 session
[s
].throttle_out
= rate_out
;
2022 // add/remove filters from session (-1 = no change)
2023 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
2025 if (!session
[s
].opened
)
2026 return; // No-one home.
2028 if (!*session
[s
].user
)
2029 return; // User not logged in
2032 if (filter_in
> MAXFILTER
) filter_in
= -1;
2033 if (filter_out
> MAXFILTER
) filter_out
= -1;
2034 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
2035 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
2039 if (session
[s
].filter_in
)
2040 ip_filters
[session
[s
].filter_in
- 1].used
--;
2043 ip_filters
[filter_in
- 1].used
++;
2045 session
[s
].filter_in
= filter_in
;
2048 if (filter_out
>= 0)
2050 if (session
[s
].filter_out
)
2051 ip_filters
[session
[s
].filter_out
- 1].used
--;
2054 ip_filters
[filter_out
- 1].used
++;
2056 session
[s
].filter_out
= filter_out
;
2060 // start tidy shutdown of session
2061 void sessionshutdown(sessionidt s
, char const *reason
, int cdn_result
, int cdn_error
, int term_cause
)
2063 int walled_garden
= session
[s
].walled_garden
;
2064 bundleidt b
= session
[s
].bundle
;
2065 //delete routes only for last session in bundle (in case of MPPP)
2066 int del_routes
= !b
|| (bundle
[b
].num_of_links
== 1);
2068 CSTAT(sessionshutdown
);
2070 if (!session
[s
].opened
)
2072 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
2073 return; // not a live session
2076 if (!session
[s
].die
)
2078 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
2079 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %u: %s\n", s
, reason
);
2080 run_plugins(PLUGIN_KILL_SESSION
, &data
);
2083 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
2085 // RADIUS Stop message
2086 uint16_t r
= radiusnew(s
);
2089 // stop, if not already trying
2090 if (radius
[r
].state
!= RADIUSSTOP
)
2092 radius
[r
].term_cause
= term_cause
;
2093 radius
[r
].term_msg
= reason
;
2094 radiussend(r
, RADIUSSTOP
);
2098 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
2100 // Save counters to dump to accounting file
2101 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
2102 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
2105 if (!session
[s
].die
)
2106 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
2109 { // IP allocated, clear and unroute
2112 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
2114 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
2115 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
2118 if (del_routes
) routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 0);
2119 session
[s
].route
[r
].ip
= 0;
2122 if (session
[s
].ip_pool_index
== -1) // static ip
2124 if (!routed
&& del_routes
) routeset(s
, session
[s
].ip
, 0, 0, 0);
2130 // unroute IPv6, if setup
2131 for (r
= 0; r
< MAXROUTE6
&& session
[s
].route6
[r
].ipv6route
.s6_addr
[0] && session
[s
].route6
[r
].ipv6prefixlen
; r
++)
2133 if (del_routes
) route6set(s
, session
[s
].route6
[r
].ipv6route
, session
[s
].route6
[r
].ipv6prefixlen
, 0);
2134 memset(&session
[s
].route6
[r
], 0, sizeof(session
[s
].route6
[r
]));
2137 if (session
[s
].ipv6address
.s6_addr
[0] && del_routes
)
2139 route6set(s
, session
[s
].ipv6address
, 128, 0);
2144 // This session was part of a bundle
2145 bundle
[b
].num_of_links
--;
2146 LOG(3, s
, session
[s
].tunnel
, "MPPP: Dropping member link: %d from bundle %d\n",s
,b
);
2147 if(bundle
[b
].num_of_links
== 0)
2150 LOG(3, s
, session
[s
].tunnel
, "MPPP: Kill bundle: %d (No remaing member links)\n",b
);
2154 // Adjust the members array to accomodate the new change
2155 uint8_t mem_num
= 0;
2156 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2157 if(bundle
[b
].members
[bundle
[b
].num_of_links
] != s
)
2160 for(ml
= 0; ml
<bundle
[b
].num_of_links
; ml
++)
2161 if(bundle
[b
].members
[ml
] == s
)
2166 bundle
[b
].members
[mem_num
] = bundle
[b
].members
[bundle
[b
].num_of_links
];
2167 LOG(3, s
, session
[s
].tunnel
, "MPPP: Adjusted member links array\n");
2169 // If the killed session is the first of the bundle,
2170 // the new first session must be stored in the cache_ipmap
2171 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2174 sessionidt new_s
= bundle
[b
].members
[0];
2177 // Add the route for this session.
2178 for (r
= 0; r
< MAXROUTE
&& session
[new_s
].route
[r
].ip
; r
++)
2183 prefixlen
= session
[new_s
].route
[r
].prefixlen
;
2184 ip
= session
[new_s
].route
[r
].ip
;
2186 if (!prefixlen
) prefixlen
= 32;
2187 ip
&= 0xffffffff << (32 - prefixlen
); // Force the ip to be the first one in the route.
2189 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
2190 cache_ipmap(i
, new_s
);
2192 cache_ipmap(session
[new_s
].ip
, new_s
);
2195 for (r
= 0; r
< MAXROUTE6
&& session
[new_s
].route6
[r
].ipv6prefixlen
; r
++)
2197 cache_ipv6map(session
[new_s
].route6
[r
].ipv6route
, session
[new_s
].route6
[r
].ipv6prefixlen
, new_s
);
2200 if (session
[new_s
].ipv6address
.s6_addr
[0])
2202 cache_ipv6map(session
[new_s
].ipv6address
, 128, new_s
);
2208 cluster_send_bundle(b
);
2212 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
2213 throttle_session(s
, 0, 0);
2217 if (session
[s
].tunnel
== TUNNEL_ID_PPPOE
)
2219 pppoe_shutdown_session(s
);
2224 controlt
*c
= controlnew(14); // sending CDN
2228 buf
[0] = htons(cdn_result
);
2229 buf
[1] = htons(cdn_error
);
2230 controlb(c
, 1, (uint8_t *)buf
, 4, 1);
2233 control16(c
, 1, cdn_result
, 1);
2235 control16(c
, 14, s
, 1); // assigned session (our end)
2236 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
2240 // update filter refcounts
2241 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
2242 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
2245 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
2246 sess_local
[s
].lcp
.restart
= 0;
2247 sess_local
[s
].ipcp
.restart
= 0;
2248 sess_local
[s
].ipv6cp
.restart
= 0;
2249 sess_local
[s
].ccp
.restart
= 0;
2251 cluster_send_session(s
);
2254 void sendipcp(sessionidt s
, tunnelidt t
)
2256 uint8_t buf
[MAXETHER
];
2260 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
2262 if (!session
[s
].unique_id
)
2264 if (!++last_id
) ++last_id
; // skip zero
2265 session
[s
].unique_id
= last_id
;
2268 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
, 0, 0, 0);
2272 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
2273 *(uint16_t *) (q
+ 2) = htons(10); // packet length
2274 q
[4] = 3; // ip address option
2275 q
[5] = 6; // option length
2276 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
2277 config
->iftun_n_address
[tunnel
[t
].indexudp
] ? config
->iftun_n_address
[tunnel
[t
].indexudp
] :
2278 my_address
; // send my IP
2280 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
2281 restart_timer(s
, ipcp
);
2284 void sendipv6cp(sessionidt s
, tunnelidt t
)
2286 uint8_t buf
[MAXETHER
];
2290 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
2292 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
, 0, 0, 0);
2296 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
2297 // only send one type
2299 *(uint16_t *) (q
+ 2) = htons(14);
2300 q
[4] = 1; // interface identifier option
2301 q
[5] = 10; // option length
2302 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
2303 *(uint32_t *) (q
+ 10) = 0;
2306 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
2307 restart_timer(s
, ipv6cp
);
2310 static void sessionclear(sessionidt s
)
2312 memset(&session
[s
], 0, sizeof(session
[s
]));
2313 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
2314 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
2316 session
[s
].tunnel
= T_FREE
; // Mark it as free.
2317 session
[s
].next
= sessionfree
;
2321 // kill a session now
2322 void sessionkill(sessionidt s
, char *reason
)
2326 if (!session
[s
].opened
) // not alive
2329 if (session
[s
].next
)
2331 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%u)\n", session
[s
].next
);
2335 if (!session
[s
].die
)
2336 sessionshutdown(s
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
2338 if (sess_local
[s
].radius
)
2339 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
2341 if (session
[s
].forwardtosession
)
2343 sessionidt sess
= session
[s
].forwardtosession
;
2344 if (session
[sess
].forwardtosession
== s
)
2346 // Shutdown the linked session also.
2347 sessionshutdown(sess
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
2351 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
2353 cluster_send_session(s
);
2356 static void tunnelclear(tunnelidt t
)
2359 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
2360 tunnel
[t
].state
= TUNNELFREE
;
2363 static void bundleclear(bundleidt b
)
2366 memset(&bundle
[b
], 0, sizeof(bundle
[b
]));
2367 bundle
[b
].state
= BUNDLEFREE
;
2370 // kill a tunnel now
2371 static void tunnelkill(tunnelidt t
, char *reason
)
2378 tunnel
[t
].state
= TUNNELDIE
;
2380 // free control messages
2381 while ((c
= tunnel
[t
].controls
))
2383 controlt
* n
= c
->next
;
2384 tunnel
[t
].controls
= n
;
2385 tunnel
[t
].controlc
--;
2386 c
->next
= controlfree
;
2390 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2391 if (session
[s
].tunnel
== t
)
2392 sessionkill(s
, reason
);
2396 LOG(1, 0, t
, "Kill tunnel %u: %s\n", t
, reason
);
2397 cli_tunnel_actions
[t
].action
= 0;
2398 cluster_send_tunnel(t
);
2401 // shut down a tunnel cleanly
2402 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
2406 CSTAT(tunnelshutdown
);
2408 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
2410 // never set up, can immediately kill
2411 tunnelkill(t
, reason
);
2414 LOG(1, 0, t
, "Shutting down tunnel %u (%s)\n", t
, reason
);
2417 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2418 if (session
[s
].tunnel
== t
)
2419 sessionshutdown(s
, reason
, CDN_NONE
, TERM_ADMIN_RESET
);
2421 tunnel
[t
].state
= TUNNELDIE
;
2422 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
2423 cluster_send_tunnel(t
);
2424 // TBA - should we wait for sessions to stop?
2427 controlt
*c
= controlnew(4); // sending StopCCN
2432 buf
[0] = htons(result
);
2433 buf
[1] = htons(error
);
2436 int m
= strlen(msg
);
2437 if (m
+ 4 > sizeof(buf
))
2438 m
= sizeof(buf
) - 4;
2440 memcpy(buf
+2, msg
, m
);
2444 controlb(c
, 1, (uint8_t *)buf
, l
, 1);
2447 control16(c
, 1, result
, 1);
2449 control16(c
, 9, t
, 1); // assigned tunnel (our end)
2450 controladd(c
, 0, t
); // send the message
2454 // read and process packet on tunnel (UDP)
2455 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, uint16_t indexudpfd
)
2457 uint8_t *sendchalresponse
= NULL
;
2458 uint8_t *recvchalresponse
= NULL
;
2459 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
2460 uint8_t *p
= buf
+ 2;
2467 LOG_HEX(5, "UDP Data", buf
, len
);
2468 STAT(tunnel_rx_packets
);
2469 INC_STAT(tunnel_rx_bytes
, len
);
2472 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
2473 STAT(tunnel_rx_errors
);
2476 if ((buf
[1] & 0x0F) != 2)
2478 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf
[1] & 0x0F);
2479 STAT(tunnel_rx_errors
);
2484 l
= ntohs(*(uint16_t *) p
);
2487 t
= ntohs(*(uint16_t *) p
);
2489 s
= ntohs(*(uint16_t *) p
);
2491 if (s
>= MAXSESSION
)
2493 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
2494 STAT(tunnel_rx_errors
);
2499 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
2500 STAT(tunnel_rx_errors
);
2503 if (t
== TUNNEL_ID_PPPOE
)
2505 LOG(1, s
, t
, "Received UDP packet with tunnel ID reserved for pppoe\n");
2506 STAT(tunnel_rx_errors
);
2511 ns
= ntohs(*(uint16_t *) p
);
2513 nr
= ntohs(*(uint16_t *) p
);
2518 uint16_t o
= ntohs(*(uint16_t *) p
);
2523 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
2524 STAT(tunnel_rx_errors
);
2529 // used to time out old tunnels
2530 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
2531 tunnel
[t
].lastrec
= time_now
;
2535 uint16_t message
= 0xFFFF; // message type
2537 uint8_t mandatory
= 0;
2538 uint16_t asession
= 0; // assigned session
2539 uint32_t amagic
= 0; // magic number
2540 uint8_t aflags
= 0; // flags from last LCF
2541 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2542 char called
[MAXTEL
] = ""; // called number
2543 char calling
[MAXTEL
] = ""; // calling number
2545 if (!config
->cluster_iam_master
)
2547 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
2551 // control messages must have bits 0x80|0x40|0x08
2552 // (type, length and sequence) set, and bits 0x02|0x01
2553 // (offset and priority) clear
2554 if ((*buf
& 0xCB) != 0xC8)
2556 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
2557 STAT(tunnel_rx_errors
);
2561 // check for duplicate tunnel open message
2567 // Is this a duplicate of the first packet? (SCCRQ)
2569 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
2571 if (tunnel
[i
].state
!= TUNNELOPENING
||
2572 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
2573 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
2576 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
2581 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2582 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
2584 // if no tunnel specified, assign one
2587 if (!(t
= new_tunnel()))
2589 LOG(1, 0, 0, "No more tunnels\n");
2590 STAT(tunnel_overflow
);
2594 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
2595 tunnel
[t
].port
= ntohs(addr
->sin_port
);
2596 tunnel
[t
].window
= 4; // default window
2597 tunnel
[t
].indexudp
= indexudpfd
;
2598 STAT(tunnel_created
);
2599 LOG(1, 0, t
, " New tunnel from %s:%u ID %u\n",
2600 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
2603 // If the 'ns' just received is not the 'nr' we're
2604 // expecting, just send an ack and drop it.
2606 // if 'ns' is less, then we got a retransmitted packet.
2607 // if 'ns' is greater than missed a packet. Either way
2608 // we should ignore it.
2609 if (ns
!= tunnel
[t
].nr
)
2611 // is this the sequence we were expecting?
2612 STAT(tunnel_rx_errors
);
2613 LOG(1, 0, t
, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2614 t
, ns
, tunnel
[t
].nr
);
2616 if (l
) // Is this not a ZLB?
2621 // check sequence of this message
2623 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2624 // some to clear maybe?
2625 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2627 controlt
*c
= tunnel
[t
].controls
;
2628 tunnel
[t
].controls
= c
->next
;
2629 tunnel
[t
].controlc
--;
2630 c
->next
= controlfree
;
2633 tunnel
[t
].try = 0; // we have progress
2636 // receiver advance (do here so quoted correctly in any sends below)
2637 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2638 if (skip
< 0) skip
= 0;
2639 if (skip
< tunnel
[t
].controlc
)
2641 // some control packets can now be sent that were previous stuck out of window
2642 int tosend
= tunnel
[t
].window
- skip
;
2643 controlt
*c
= tunnel
[t
].controls
;
2651 tunnel
[t
].try = 0; // first send
2652 tunnelsend(c
->buf
, c
->length
, t
);
2657 if (!tunnel
[t
].controlc
)
2658 tunnel
[t
].retry
= 0; // caught up
2661 { // if not a null message
2666 // Default disconnect cause/message on receipt of CDN. Set to
2667 // more specific value from attribute 1 (result code) or 46
2668 // (disconnect cause) if present below.
2669 int disc_cause_set
= 0;
2670 int disc_cause
= TERM_NAS_REQUEST
;
2671 char const *disc_reason
= "Closed (Received CDN).";
2674 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2676 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2683 LOG(1, s
, t
, "Invalid length in AVP\n");
2684 STAT(tunnel_rx_errors
);
2689 if (flags
& 0x3C) // reserved bits, should be clear
2691 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2693 result
= 2; // general error
2694 error
= 3; // reserved field non-zero
2699 if (*(uint16_t *) (b
))
2701 LOG(2, s
, t
, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b
)));
2703 result
= 2; // general error
2704 error
= 6; // generic vendor-specific error
2705 msg
= "unsupported vendor-specific";
2709 mtype
= ntohs(*(uint16_t *) (b
));
2717 // handle hidden AVPs
2718 if (!*config
->l2tp_secret
)
2720 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2722 result
= 2; // general error
2723 error
= 6; // generic vendor-specific error
2724 msg
= "secret not specified";
2727 if (!session
[s
].random_vector_length
)
2729 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2731 result
= 2; // general error
2732 error
= 6; // generic
2733 msg
= "no random vector";
2738 LOG(2, s
, t
, "Short hidden AVP.\n");
2740 result
= 2; // general error
2741 error
= 2; // length is wrong
2747 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2749 orig_len
= ntohs(*(uint16_t *) b
);
2750 if (orig_len
> n
+ 2)
2752 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2756 result
= 2; // general error
2757 error
= 2; // length is wrong
2766 LOG(4, s
, t
, " AVP %u (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2767 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2771 case 0: // message type
2772 message
= ntohs(*(uint16_t *) b
);
2773 mandatory
= flags
& 0x80;
2774 LOG(4, s
, t
, " Message type = %u (%s)\n", message
, l2tp_code(message
));
2776 case 1: // result code
2778 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2779 char const *resdesc
= "(unknown)";
2780 char const *errdesc
= NULL
;
2785 resdesc
= l2tp_stopccn_result_code(rescode
);
2786 cause
= TERM_LOST_SERVICE
;
2788 else if (message
== 14)
2790 resdesc
= l2tp_cdn_result_code(rescode
);
2792 cause
= TERM_LOST_CARRIER
;
2794 cause
= TERM_ADMIN_RESET
;
2797 LOG(4, s
, t
, " Result Code %u: %s\n", rescode
, resdesc
);
2800 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2801 errdesc
= l2tp_error_code(errcode
);
2802 LOG(4, s
, t
, " Error Code %u: %s\n", errcode
, errdesc
);
2805 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2807 if (cause
&& disc_cause_set
< mtype
) // take cause from attrib 46 in preference
2809 disc_cause_set
= mtype
;
2810 disc_reason
= errdesc
? errdesc
: resdesc
;
2817 case 2: // protocol version
2819 version
= ntohs(*(uint16_t *) (b
));
2820 LOG(4, s
, t
, " Protocol version = %u\n", version
);
2821 if (version
&& version
!= 0x0100)
2822 { // allow 0.0 and 1.0
2823 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2825 result
= 5; // unspported protocol version
2826 error
= 0x0100; // supported version
2832 case 3: // framing capabilities
2834 case 4: // bearer capabilities
2836 case 5: // tie breaker
2837 // We never open tunnels, so we don't care about tie breakers
2839 case 6: // firmware revision
2841 case 7: // host name
2842 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2843 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2844 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2845 // TBA - to send to RADIUS
2847 case 8: // vendor name
2848 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2849 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2850 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2852 case 9: // assigned tunnel
2853 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2854 LOG(4, s
, t
, " Remote tunnel id = %u\n", tunnel
[t
].far
);
2856 case 10: // rx window
2857 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2858 if (!tunnel
[t
].window
)
2859 tunnel
[t
].window
= 1; // window of 0 is silly
2860 LOG(4, s
, t
, " rx window = %u\n", tunnel
[t
].window
);
2862 case 11: // Request Challenge
2864 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2866 build_chap_response(b
, 2, n
, &sendchalresponse
);
2867 else if (message
== 2)
2868 build_chap_response(b
, 3, n
, &sendchalresponse
);
2871 case 13: // receive challenge Response
2872 if (tunnel
[t
].isremotelns
)
2874 recvchalresponse
= calloc(17, 1);
2875 memcpy(recvchalresponse
, b
, (n
< 17) ? n
: 16);
2876 LOG(3, s
, t
, "received challenge response from REMOTE LNS\n");
2879 // Why did they send a response? We never challenge.
2880 LOG(2, s
, t
, " received unexpected challenge response\n");
2883 case 14: // assigned session
2884 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2885 LOG(4, s
, t
, " assigned session = %u\n", asession
);
2887 case 15: // call serial number
2888 LOG(4, s
, t
, " call serial number = %u\n", ntohl(*(uint32_t *)b
));
2890 case 18: // bearer type
2891 LOG(4, s
, t
, " bearer type = %u\n", ntohl(*(uint32_t *)b
));
2894 case 19: // framing type
2895 LOG(4, s
, t
, " framing type = %u\n", ntohl(*(uint32_t *)b
));
2898 case 21: // called number
2899 memset(called
, 0, sizeof(called
));
2900 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2901 LOG(4, s
, t
, " Called <%s>\n", called
);
2903 case 22: // calling number
2904 memset(calling
, 0, sizeof(calling
));
2905 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2906 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2910 case 24: // tx connect speed
2913 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2917 // AS5300s send connect speed as a string
2919 memset(tmp
, 0, sizeof(tmp
));
2920 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2921 session
[s
].tx_connect_speed
= atol(tmp
);
2923 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2925 case 38: // rx connect speed
2928 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2932 // AS5300s send connect speed as a string
2934 memset(tmp
, 0, sizeof(tmp
));
2935 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2936 session
[s
].rx_connect_speed
= atol(tmp
);
2938 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2940 case 25: // Physical Channel ID
2942 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2943 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2946 case 29: // Proxy Authentication Type
2948 uint16_t atype
= ntohs(*(uint16_t *)b
);
2949 LOG(4, s
, t
, " Proxy Auth Type %u (%s)\n", atype
, ppp_auth_type(atype
));
2952 case 30: // Proxy Authentication Name
2955 memset(authname
, 0, sizeof(authname
));
2956 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2957 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2961 case 31: // Proxy Authentication Challenge
2963 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2966 case 32: // Proxy Authentication ID
2968 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2969 LOG(4, s
, t
, " Proxy Auth ID (%u)\n", authid
);
2972 case 33: // Proxy Authentication Response
2973 LOG(4, s
, t
, " Proxy Auth Response\n");
2975 case 27: // last sent lcp
2976 { // find magic number
2977 uint8_t *p
= b
, *e
= p
+ n
;
2978 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2980 if (*p
== 5 && p
[1] == 6) // Magic-Number
2981 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2982 else if (*p
== 7) // Protocol-Field-Compression
2983 aflags
|= SESSION_PFC
;
2984 else if (*p
== 8) // Address-and-Control-Field-Compression
2985 aflags
|= SESSION_ACFC
;
2990 case 28: // last recv lcp confreq
2992 case 26: // Initial Received LCP CONFREQ
2994 case 39: // seq required - we control it as an LNS anyway...
2996 case 36: // Random Vector
2997 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2998 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2999 if (n
> sizeof(session
[s
].random_vector
))
3000 n
= sizeof(session
[s
].random_vector
);
3001 memcpy(session
[s
].random_vector
, b
, n
);
3002 session
[s
].random_vector_length
= n
;
3004 case 46: // ppp disconnect cause
3007 uint16_t code
= ntohs(*(uint16_t *) b
);
3008 uint16_t proto
= ntohs(*(uint16_t *) (b
+ 2));
3009 uint8_t dir
= *(b
+ 4);
3011 LOG(4, s
, t
, " PPP disconnect cause "
3012 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3013 code
, proto
, dir
, n
- 5, b
+ 5);
3015 disc_cause_set
= mtype
;
3019 case 1: // admin disconnect
3020 disc_cause
= TERM_ADMIN_RESET
;
3021 disc_reason
= "Administrative disconnect";
3023 case 3: // lcp terminate
3024 if (dir
!= 2) break; // 1=peer (LNS), 2=local (LAC)
3025 disc_cause
= TERM_USER_REQUEST
;
3026 disc_reason
= "Normal disconnection";
3028 case 4: // compulsory encryption unavailable
3029 if (dir
!= 1) break; // 1=refused by peer, 2=local
3030 disc_cause
= TERM_USER_ERROR
;
3031 disc_reason
= "Compulsory encryption refused";
3033 case 5: // lcp: fsm timeout
3034 disc_cause
= TERM_PORT_ERROR
;
3035 disc_reason
= "LCP: FSM timeout";
3037 case 6: // lcp: no recognisable lcp packets received
3038 disc_cause
= TERM_PORT_ERROR
;
3039 disc_reason
= "LCP: no recognisable LCP packets";
3041 case 7: // lcp: magic-no error (possibly looped back)
3042 disc_cause
= TERM_PORT_ERROR
;
3043 disc_reason
= "LCP: magic-no error (possible loop)";
3045 case 8: // lcp: echo request timeout
3046 disc_cause
= TERM_PORT_ERROR
;
3047 disc_reason
= "LCP: echo request timeout";
3049 case 13: // auth: fsm timeout
3050 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3051 disc_reason
= "Authentication: FSM timeout";
3053 case 15: // auth: unacceptable auth protocol
3054 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3055 disc_reason
= "Unacceptable authentication protocol";
3057 case 16: // auth: authentication failed
3058 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3059 disc_reason
= "Authentication failed";
3061 case 17: // ncp: fsm timeout
3062 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3063 disc_reason
= "NCP: FSM timeout";
3065 case 18: // ncp: no ncps available
3066 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3067 disc_reason
= "NCP: no NCPs available";
3069 case 19: // ncp: failure to converge on acceptable address
3070 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3071 disc_reason
= (dir
== 1)
3072 ? "NCP: too many Configure-Naks received from peer"
3073 : "NCP: too many Configure-Naks sent to peer";
3075 case 20: // ncp: user not permitted to use any address
3076 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3077 disc_reason
= (dir
== 1)
3078 ? "NCP: local link address not acceptable to peer"
3079 : "NCP: remote link address not acceptable";
3086 static char e
[] = "unknown AVP 0xXXXX";
3087 LOG(2, s
, t
, " Unknown AVP type %u\n", mtype
);
3089 result
= 2; // general error
3090 error
= 8; // unknown mandatory AVP
3091 sprintf((msg
= e
) + 14, "%04x", mtype
);
3098 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
3102 case 1: // SCCRQ - Start Control Connection Request
3103 tunnel
[t
].state
= TUNNELOPENING
;
3104 LOG(3, s
, t
, "Received SCCRQ\n");
3105 if (main_quit
!= QUIT_SHUTDOWN
)
3107 LOG(3, s
, t
, "sending SCCRP\n");
3108 controlt
*c
= controlnew(2); // sending SCCRP
3109 control16(c
, 2, version
, 1); // protocol version
3110 control32(c
, 3, 3, 1); // framing
3111 controls(c
, 7, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
, 1); // host name
3112 if (sendchalresponse
) controlb(c
, 13, sendchalresponse
, 16, 1); // Send Challenge response
3113 control16(c
, 9, t
, 1); // assigned tunnel
3114 controladd(c
, 0, t
); // send the resply
3118 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
3122 tunnel
[t
].state
= TUNNELOPEN
;
3123 tunnel
[t
].lastrec
= time_now
;
3124 LOG(3, s
, t
, "Received SCCRP\n");
3125 if (main_quit
!= QUIT_SHUTDOWN
)
3127 if (tunnel
[t
].isremotelns
&& recvchalresponse
)
3131 lac_calc_rlns_auth(t
, 2, hash
); // id = 2 (SCCRP)
3132 // check authenticator
3133 if (memcmp(hash
, recvchalresponse
, 16) == 0)
3135 LOG(3, s
, t
, "sending SCCCN to REMOTE LNS\n");
3136 controlt
*c
= controlnew(3); // sending SCCCN
3137 controls(c
, 7, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
, 1); // host name
3138 controls(c
, 8, Vendor_name
, 1); // Vendor name
3139 control16(c
, 2, version
, 1); // protocol version
3140 control32(c
, 3, 3, 1); // framing Capabilities
3141 if (sendchalresponse
) controlb(c
, 13, sendchalresponse
, 16, 1); // Challenge response
3142 control16(c
, 9, t
, 1); // assigned tunnel
3143 controladd(c
, 0, t
); // send
3147 tunnelshutdown(t
, "Bad chap response from REMOTE LNS", 4, 0, 0);
3153 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
3157 LOG(3, s
, t
, "Received SCCN\n");
3158 tunnel
[t
].state
= TUNNELOPEN
;
3159 tunnel
[t
].lastrec
= time_now
;
3160 controlnull(t
); // ack
3163 LOG(3, s
, t
, "Received StopCCN\n");
3164 controlnull(t
); // ack
3165 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
3168 LOG(3, s
, t
, "Received HELLO\n");
3169 controlnull(t
); // simply ACK
3173 LOG(3, s
, t
, "Received OCRQ\n");
3177 LOG(3, s
, t
, "Received OCRO\n");
3181 LOG(3, s
, t
, "Received OCCN\n");
3184 LOG(3, s
, t
, "Received ICRQ\n");
3185 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
3187 controlt
*c
= controlnew(11); // ICRP
3189 LOG(3, s
, t
, "Sending ICRP\n");
3192 sessionfree
= session
[s
].next
;
3193 memset(&session
[s
], 0, sizeof(session
[s
]));
3195 if (s
> config
->cluster_highest_sessionid
)
3196 config
->cluster_highest_sessionid
= s
;
3198 session
[s
].opened
= time_now
;
3199 session
[s
].tunnel
= t
;
3200 session
[s
].far
= asession
;
3201 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3202 LOG(3, s
, t
, "New session (%u/%u)\n", tunnel
[t
].far
, session
[s
].far
);
3203 control16(c
, 14, s
, 1); // assigned session
3204 controladd(c
, asession
, t
); // send the reply
3206 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
3207 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
3209 session
[s
].ppp
.phase
= Establish
;
3210 session
[s
].ppp
.lcp
= Starting
;
3212 STAT(session_created
);
3217 controlt
*c
= controlnew(14); // CDN
3218 LOG(3, s
, t
, "Sending CDN\n");
3221 STAT(session_overflow
);
3222 LOG(1, 0, t
, "No free sessions\n");
3223 control16(c
, 1, 4, 0); // temporary lack of resources
3226 control16(c
, 1, 2, 7); // shutting down, try another
3228 controladd(c
, asession
, t
); // send the message
3232 LOG(3, s
, t
, "Received ICRP\n");
3233 if (session
[s
].forwardtosession
)
3235 controlt
*c
= controlnew(12); // ICCN
3237 session
[s
].opened
= time_now
;
3238 session
[s
].tunnel
= t
;
3239 session
[s
].far
= asession
;
3240 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3242 control32(c
, 19, 1, 1); // Framing Type
3243 control32(c
, 24, 10000000, 1); // Tx Connect Speed
3244 controladd(c
, asession
, t
); // send the message
3245 LOG(3, s
, t
, "Sending ICCN\n");
3249 LOG(3, s
, t
, "Received ICCN\n");
3250 if (amagic
== 0) amagic
= time_now
;
3251 session
[s
].magic
= amagic
; // set magic number
3252 session
[s
].flags
= aflags
; // set flags received
3253 session
[s
].mru
= PPPoE_MRU
; // default
3254 controlnull(t
); // ack
3257 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
3258 sess_local
[s
].ppp_mru
= MRU
;
3260 // Set multilink options before sending initial LCP packet
3261 sess_local
[s
].mp_mrru
= 1614;
3262 sess_local
[s
].mp_epdis
= ntohl(config
->iftun_address
? config
->iftun_address
: my_address
);
3265 change_state(s
, lcp
, RequestSent
);
3269 LOG(3, s
, t
, "Received CDN\n");
3270 controlnull(t
); // ack
3271 sessionshutdown(s
, disc_reason
, CDN_NONE
, disc_cause
);
3274 LOG(1, s
, t
, "Missing message type\n");
3277 STAT(tunnel_rx_errors
);
3279 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
3281 LOG(1, s
, t
, "Unknown message type %u\n", message
);
3284 if (sendchalresponse
) free(sendchalresponse
);
3285 if (recvchalresponse
) free(recvchalresponse
);
3286 cluster_send_tunnel(t
);
3290 LOG(4, s
, t
, " Got a ZLB ack\n");
3297 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
3298 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
3299 { // HDLC address header, discard
3305 LOG(1, s
, t
, "Short ppp length %d\n", l
);
3306 STAT(tunnel_rx_errors
);
3316 proto
= ntohs(*(uint16_t *) p
);
3321 if (session
[s
].forwardtosession
)
3323 LOG(5, s
, t
, "Forwarding data session to session %u\n", session
[s
].forwardtosession
);
3324 // Forward to LAC/BAS or Remote LNS session
3325 lac_session_forward(buf
, len
, s
, proto
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3328 else if (config
->auth_tunnel_change_addr_src
)
3330 if (tunnel
[t
].ip
!= ntohl(addr
->sin_addr
.s_addr
) &&
3331 tunnel
[t
].port
== ntohs(addr
->sin_port
))
3333 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3334 LOG(5, s
, t
, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3335 fmtaddr(htonl(tunnel
[t
].ip
), 0), fmtaddr(addr
->sin_addr
.s_addr
, 0));
3337 tunnel
[t
].ip
= ntohl(addr
->sin_addr
.s_addr
);
3341 if (s
&& !session
[s
].opened
) // Is something wrong??
3343 if (!config
->cluster_iam_master
)
3345 // Pass it off to the master to deal with..
3346 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3350 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
3351 STAT(tunnel_rx_errors
);
3355 if (proto
== PPPPAP
)
3357 session
[s
].last_packet
= time_now
;
3358 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3359 processpap(s
, t
, p
, l
);
3361 else if (proto
== PPPCHAP
)
3363 session
[s
].last_packet
= time_now
;
3364 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3365 processchap(s
, t
, p
, l
);
3367 else if (proto
== PPPLCP
)
3369 session
[s
].last_packet
= time_now
;
3370 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3371 processlcp(s
, t
, p
, l
);
3373 else if (proto
== PPPIPCP
)
3375 session
[s
].last_packet
= time_now
;
3376 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3377 processipcp(s
, t
, p
, l
);
3379 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
3381 session
[s
].last_packet
= time_now
;
3382 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3383 processipv6cp(s
, t
, p
, l
);
3385 else if (proto
== PPPCCP
)
3387 session
[s
].last_packet
= time_now
;
3388 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3389 processccp(s
, t
, p
, l
);
3391 else if (proto
== PPPIP
)
3395 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3396 return; // closing session, PPP not processed
3399 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3400 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3402 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3406 processipin(s
, t
, p
, l
);
3408 else if (proto
== PPPMP
)
3412 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3413 return; // closing session, PPP not processed
3416 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3417 if (!config
->cluster_iam_master
)
3419 // The fragments reconstruction is managed by the Master.
3420 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3424 processmpin(s
, t
, p
, l
);
3426 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
3430 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3431 return; // closing session, PPP not processed
3434 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3435 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3437 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3441 if (!config
->cluster_iam_master
)
3443 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
3444 if (*(p
+ 6) == 17 && *(p
+ 24) == 0xFF && *(p
+ 25) == 2 &&
3445 *(uint32_t *)(p
+ 26) == 0 && *(uint32_t *)(p
+ 30) == 0 &&
3446 *(uint16_t *)(p
+ 34) == 0 && *(p
+ 36) == 0 && *(p
+ 37) == 1 && *(p
+ 38) == 0 && *(p
+ 39) == 2 &&
3447 *(p
+ 40) == 2 && *(p
+ 41) == 0x22 && *(p
+ 42) == 2 && *(p
+ 43) == 0x23)
3449 // DHCPV6 must be managed by the Master.
3450 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3455 processipv6in(s
, t
, p
, l
);
3457 else if (session
[s
].ppp
.lcp
== Opened
)
3459 session
[s
].last_packet
= time_now
;
3460 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3461 protoreject(s
, t
, p
, l
, proto
);
3465 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3466 proto
, ppp_state(session
[s
].ppp
.lcp
));
3471 // read and process packet on tun
3472 // (i.e. this routine writes to buf[-8]).
3473 static void processtun(uint8_t * buf
, int len
)
3475 LOG_HEX(5, "Receive TUN Data", buf
, len
);
3476 STAT(tun_rx_packets
);
3477 INC_STAT(tun_rx_bytes
, len
);
3485 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
3486 STAT(tun_rx_errors
);
3490 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
3491 processipout(buf
, len
);
3492 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
3493 && config
->ipv6_prefix
.s6_addr
[0])
3494 processipv6out(buf
, len
);
3499 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3500 // that we look at the whole of the tunnel, radius and session tables
3502 static void regular_cleanups(double period
)
3504 // Next tunnel, radius and session to check for actions on.
3505 static tunnelidt t
= 0;
3507 static sessionidt s
= 0;
3520 // divide up tables into slices based on the last run
3521 t_slice
= config
->cluster_highest_tunnelid
* period
;
3522 r_slice
= (MAXRADIUS
- 1) * period
;
3523 s_slice
= config
->cluster_highest_sessionid
* period
;
3527 else if (t_slice
> config
->cluster_highest_tunnelid
)
3528 t_slice
= config
->cluster_highest_tunnelid
;
3532 else if (r_slice
> (MAXRADIUS
- 1))
3533 r_slice
= MAXRADIUS
- 1;
3537 else if (s_slice
> config
->cluster_highest_sessionid
)
3538 s_slice
= config
->cluster_highest_sessionid
;
3540 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
3542 for (i
= 0; i
< t_slice
; i
++)
3545 if (t
> config
->cluster_highest_tunnelid
)
3548 if (t
== TUNNEL_ID_PPPOE
)
3551 // check for expired tunnels
3552 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
3554 STAT(tunnel_timeout
);
3555 tunnelkill(t
, "Expired");
3559 // check for message resend
3560 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
3562 // resend pending messages as timeout on reply
3563 if (tunnel
[t
].retry
<= TIME
)
3565 controlt
*c
= tunnel
[t
].controls
;
3566 uint16_t w
= tunnel
[t
].window
;
3567 tunnel
[t
].try++; // another try
3568 if (tunnel
[t
].try > 5)
3569 tunnelkill(t
, "Timeout on control message"); // game over
3573 tunnelsend(c
->buf
, c
->length
, t
);
3581 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
3583 if (!config
->disable_sending_hello
)
3585 controlt
*c
= controlnew(6); // sending HELLO
3586 controladd(c
, 0, t
); // send the message
3587 LOG(3, 0, t
, "Sending HELLO message\n");
3592 // Check for tunnel changes requested from the CLI
3593 if ((a
= cli_tunnel_actions
[t
].action
))
3595 cli_tunnel_actions
[t
].action
= 0;
3596 if (a
& CLI_TUN_KILL
)
3598 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
3599 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
3605 for (i
= 0; i
< r_slice
; i
++)
3611 if (!radius
[r
].state
)
3614 if (radius
[r
].retry
<= TIME
)
3621 for (i
= 0; i
< s_slice
; i
++)
3624 if (s
> config
->cluster_highest_sessionid
)
3627 if (!session
[s
].opened
) // Session isn't in use
3630 // check for expired sessions
3633 if (session
[s
].die
<= TIME
)
3635 sessionkill(s
, "Expired");
3642 if (sess_local
[s
].lcp
.restart
<= time_now
)
3644 int next_state
= session
[s
].ppp
.lcp
;
3645 switch (session
[s
].ppp
.lcp
)
3649 next_state
= RequestSent
;
3652 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
3654 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
3655 sendlcp(s
, session
[s
].tunnel
);
3656 change_state(s
, lcp
, next_state
);
3660 sessionshutdown(s
, "No response to LCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3661 STAT(session_timeout
);
3671 if (sess_local
[s
].ipcp
.restart
<= time_now
)
3673 int next_state
= session
[s
].ppp
.ipcp
;
3674 switch (session
[s
].ppp
.ipcp
)
3678 next_state
= RequestSent
;
3681 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
3683 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
3684 sendipcp(s
, session
[s
].tunnel
);
3685 change_state(s
, ipcp
, next_state
);
3689 sessionshutdown(s
, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3690 STAT(session_timeout
);
3700 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
3702 int next_state
= session
[s
].ppp
.ipv6cp
;
3703 switch (session
[s
].ppp
.ipv6cp
)
3707 next_state
= RequestSent
;
3710 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
3712 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
3713 sendipv6cp(s
, session
[s
].tunnel
);
3714 change_state(s
, ipv6cp
, next_state
);
3718 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
3719 change_state(s
, ipv6cp
, Stopped
);
3726 if (sess_local
[s
].ccp
.restart
<= time_now
)
3728 int next_state
= session
[s
].ppp
.ccp
;
3729 switch (session
[s
].ppp
.ccp
)
3733 next_state
= RequestSent
;
3736 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
3738 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
3739 sendccp(s
, session
[s
].tunnel
);
3740 change_state(s
, ccp
, next_state
);
3744 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
3745 change_state(s
, ccp
, Stopped
);
3752 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3753 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= config
->idle_echo_timeout
))
3755 sessionshutdown(s
, "No response to LCP ECHO requests.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3756 STAT(session_timeout
);
3761 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3762 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= config
->echo_timeout
) &&
3763 (time_now
- sess_local
[s
].last_echo
>= ECHO_TIMEOUT
))
3765 uint8_t b
[MAXETHER
];
3767 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
, 1, 0, 0);
3771 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
3772 *(uint16_t *)(q
+ 2) = htons(8); // Length
3773 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
3775 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
3776 (int)(time_now
- session
[s
].last_packet
));
3778 tunnelsend(b
, (q
- b
) + 8, session
[s
].tunnel
); // send it
3779 sess_local
[s
].last_echo
= time_now
;
3783 // Drop sessions who have reached session_timeout seconds
3784 if (session
[s
].session_timeout
)
3786 bundleidt bid
= session
[s
].bundle
;
3789 if (time_now
- bundle
[bid
].last_check
>= 1)
3791 bundle
[bid
].online_time
+= (time_now
- bundle
[bid
].last_check
) * bundle
[bid
].num_of_links
;
3792 bundle
[bid
].last_check
= time_now
;
3793 if (bundle
[bid
].online_time
>= session
[s
].session_timeout
)
3796 for (ses
= bundle
[bid
].num_of_links
- 1; ses
>= 0; ses
--)
3798 sessionshutdown(bundle
[bid
].members
[ses
], "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3805 else if (time_now
- session
[s
].opened
>= session
[s
].session_timeout
)
3807 sessionshutdown(s
, "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3813 // Drop sessions who have reached idle_timeout seconds
3814 if (session
[s
].last_data
&& session
[s
].idle_timeout
&& (time_now
- session
[s
].last_data
>= session
[s
].idle_timeout
))
3816 sessionshutdown(s
, "Idle Timeout Reached", CDN_ADMIN_DISC
, TERM_IDLE_TIMEOUT
);
3817 STAT(session_timeout
);
3822 // Check for actions requested from the CLI
3823 if ((a
= cli_session_actions
[s
].action
))
3827 cli_session_actions
[s
].action
= 0;
3828 if (a
& CLI_SESS_KILL
)
3830 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
3831 sessionshutdown(s
, "Requested by administrator.", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
3832 a
= 0; // dead, no need to check for other actions
3836 if (a
& CLI_SESS_NOSNOOP
)
3838 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
3839 session
[s
].snoop_ip
= 0;
3840 session
[s
].snoop_port
= 0;
3844 else if (a
& CLI_SESS_SNOOP
)
3846 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%u)\n",
3847 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
3848 cli_session_actions
[s
].snoop_port
);
3850 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
3851 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
3856 if (a
& CLI_SESS_NOTHROTTLE
)
3858 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
3859 throttle_session(s
, 0, 0);
3863 else if (a
& CLI_SESS_THROTTLE
)
3865 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3866 cli_session_actions
[s
].throttle_in
,
3867 cli_session_actions
[s
].throttle_out
);
3869 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3874 if (a
& CLI_SESS_NOFILTER
)
3876 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3877 filter_session(s
, 0, 0);
3881 else if (a
& CLI_SESS_FILTER
)
3883 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3884 cli_session_actions
[s
].filter_in
,
3885 cli_session_actions
[s
].filter_out
);
3887 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3893 cluster_send_session(s
);
3896 // RADIUS interim accounting
3897 if (config
->radius_accounting
&& config
->radius_interim
> 0
3898 && session
[s
].ip
&& !session
[s
].walled_garden
3899 && !sess_local
[s
].radius
// RADIUS already in progress
3900 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
3901 && session
[s
].flags
& SESSION_STARTED
)
3903 int rad
= radiusnew(s
);
3906 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3907 STAT(radius_overflow
);
3911 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3912 session
[s
].user
, session
[s
].unique_id
);
3914 radiussend(rad
, RADIUSINTERIM
);
3915 sess_local
[s
].last_interim
= time_now
;
3920 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3921 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3925 // Are we in the middle of a tunnel update, or radius
3928 static int still_busy(void)
3931 static clockt last_talked
= 0;
3932 static clockt start_busy_wait
= 0;
3935 static time_t stopped_bgp
= 0;
3940 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3942 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3943 if (bgp_peers
[i
].state
== Established
)
3944 bgp_stop(&bgp_peers
[i
]);
3946 stopped_bgp
= time_now
;
3948 if (!config
->cluster_iam_master
)
3950 // we don't want to become master
3951 cluster_send_ping(0);
3957 if (!config
->cluster_iam_master
&& time_now
< (stopped_bgp
+ QUIT_DELAY
))
3962 if (!config
->cluster_iam_master
)
3965 if (main_quit
== QUIT_SHUTDOWN
)
3967 static int dropped
= 0;
3972 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3973 for (i
= 1; i
< MAXTUNNEL
; i
++)
3974 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3975 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3981 if (start_busy_wait
== 0)
3982 start_busy_wait
= TIME
;
3984 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3986 if (!tunnel
[i
].controlc
)
3989 if (last_talked
!= TIME
)
3991 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i
);
3997 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3998 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
4000 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
4004 for (i
= 1; i
< MAXRADIUS
; i
++)
4006 if (radius
[i
].state
== RADIUSNULL
)
4008 if (radius
[i
].state
== RADIUSWAIT
)
4011 if (last_talked
!= TIME
)
4013 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i
, radius
[i
].session
);
4023 # include <sys/epoll.h>
4025 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4026 # include "fake_epoll.h"
4029 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4030 #define BASE_FDS (9 + MAX_UDPFD)
4032 // additional polled fds
4034 # define EXTRA_FDS BGP_NUM_PEERS
4036 # define EXTRA_FDS 0
4039 // main loop - gets packets on tun or udp and processes them
4040 static void mainloop(void)
4044 uint8_t *p
= buf
+ 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4045 // and the forwarded pppoe session
4046 int size_bufp
= sizeof(buf
) - 32;
4047 clockt next_cluster_ping
= 0; // send initial ping immediately
4048 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
4049 int maxevent
= sizeof(events
)/sizeof(*events
);
4051 if ((epollfd
= epoll_create(maxevent
)) < 0)
4053 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
4057 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d , udplacfd=%d, pppoefd=%d, pppoesessfd=%d\n",
4058 clifd
, cluster_sockfd
, tunfd
, udpfd
[0], controlfd
, daefd
, nlfd
, udplacfd
, pppoediscfd
, pppoesessfd
);
4060 /* setup our fds to poll for input */
4062 static struct event_data d
[BASE_FDS
];
4063 struct epoll_event e
;
4070 d
[i
].type
= FD_TYPE_CLI
;
4071 e
.data
.ptr
= &d
[i
++];
4072 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
4075 d
[i
].type
= FD_TYPE_CLUSTER
;
4076 e
.data
.ptr
= &d
[i
++];
4077 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
4079 d
[i
].type
= FD_TYPE_TUN
;
4080 e
.data
.ptr
= &d
[i
++];
4081 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
4083 d
[i
].type
= FD_TYPE_CONTROL
;
4084 e
.data
.ptr
= &d
[i
++];
4085 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
4087 d
[i
].type
= FD_TYPE_DAE
;
4088 e
.data
.ptr
= &d
[i
++];
4089 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
4091 d
[i
].type
= FD_TYPE_NETLINK
;
4092 e
.data
.ptr
= &d
[i
++];
4093 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, nlfd
, &e
);
4095 d
[i
].type
= FD_TYPE_PPPOEDISC
;
4096 e
.data
.ptr
= &d
[i
++];
4097 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoediscfd
, &e
);
4099 d
[i
].type
= FD_TYPE_PPPOESESS
;
4100 e
.data
.ptr
= &d
[i
++];
4101 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoesessfd
, &e
);
4103 for (j
= 0; j
< config
->nbudpfd
; j
++)
4105 d
[i
].type
= FD_TYPE_UDP
;
4107 e
.data
.ptr
= &d
[i
++];
4108 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
[j
], &e
);
4113 signal(SIGPIPE
, SIG_IGN
);
4114 bgp_setup(config
->as_number
);
4115 if (config
->bind_address
)
4116 bgp_add_route(config
->bind_address
, 0xffffffff);
4118 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
4120 if (config
->neighbour
[i
].name
[0])
4121 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
4122 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
4123 config
->neighbour
[i
].hold
, config
->neighbour
[i
].update_source
,
4124 0); /* 0 = routing disabled */
4128 while (!main_quit
|| still_busy())
4138 config
->reload_config
++;
4141 if (config
->reload_config
)
4143 config
->reload_config
= 0;
4151 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
4152 STAT(select_called
);
4157 if (errno
== EINTR
||
4158 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
4161 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
4167 struct sockaddr_in addr
;
4168 struct in_addr local
;
4171 int udp_ready
[MAX_UDPFD
+ 1] = INIT_TABUDPVAR
;
4172 int pppoesess_ready
= 0;
4173 int pppoesess_pkts
= 0;
4175 int cluster_ready
= 0;
4176 int udp_pkts
[MAX_UDPFD
+ 1] = INIT_TABUDPVAR
;
4178 int cluster_pkts
= 0;
4180 uint32_t bgp_events
[BGP_NUM_PEERS
];
4181 memset(bgp_events
, 0, sizeof(bgp_events
));
4184 for (c
= n
, i
= 0; i
< c
; i
++)
4186 struct event_data
*d
= events
[i
].data
.ptr
;
4190 case FD_TYPE_CLI
: // CLI connections
4194 alen
= sizeof(addr
);
4195 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
4201 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
4207 // these are handled below, with multiple interleaved reads
4208 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
4209 case FD_TYPE_TUN
: tun_ready
++; break;
4210 case FD_TYPE_UDP
: udp_ready
[d
->index
]++; break;
4211 case FD_TYPE_PPPOESESS
: pppoesess_ready
++; break;
4213 case FD_TYPE_PPPOEDISC
: // pppoe discovery
4214 s
= read(pppoediscfd
, p
, size_bufp
);
4215 if (s
> 0) process_pppoe_disc(p
, s
);
4219 case FD_TYPE_CONTROL
: // nsctl commands
4220 alen
= sizeof(addr
);
4221 s
= recvfromto(controlfd
, p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4222 if (s
> 0) processcontrol(p
, s
, &addr
, alen
, &local
);
4226 case FD_TYPE_DAE
: // DAE requests
4227 alen
= sizeof(addr
);
4228 s
= recvfromto(daefd
, p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4229 if (s
> 0) processdae(p
, s
, &addr
, alen
, &local
);
4233 case FD_TYPE_RADIUS
: // RADIUS response
4234 alen
= sizeof(addr
);
4235 s
= recvfrom(radfds
[d
->index
], p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
4236 if (s
>= 0 && config
->cluster_iam_master
)
4238 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
4239 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
4240 processrad(p
, s
, d
->index
);
4242 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4243 fmtaddr(addr
.sin_addr
.s_addr
, 0));
4251 bgp_events
[d
->index
] = events
[i
].events
;
4256 case FD_TYPE_NETLINK
:
4258 struct nlmsghdr
*nh
= (struct nlmsghdr
*)p
;
4259 s
= netlink_recv(p
, size_bufp
);
4260 if (nh
->nlmsg_type
== NLMSG_ERROR
)
4262 struct nlmsgerr
*errmsg
= NLMSG_DATA(nh
);
4265 if (errmsg
->msg
.nlmsg_seq
< min_initok_nlseqnum
)
4267 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg
[nh
->nlmsg_seq
], strerror(-errmsg
->error
));
4271 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg
->error
));
4276 LOG(1, 0, 0, "Got a unknown netlink message: type %d seq %d flags %d\n", nh
->nlmsg_type
, nh
->nlmsg_seq
, nh
->nlmsg_flags
);
4282 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
4287 bgp_process(bgp_events
);
4290 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
4292 for (j
= 0; j
< config
->nbudpfd
; j
++)
4294 // L2TP and L2TP REMOTE LNS
4297 alen
= sizeof(addr
);
4298 if ((s
= recvfrom(udpfd
[j
], p
, size_bufp
, 0, (void *) &addr
, &alen
)) > 0)
4300 processudp(p
, s
, &addr
, j
);
4314 if ((s
= read(tunfd
, p
, size_bufp
)) > 0)
4327 if (pppoesess_ready
)
4329 if ((s
= read(pppoesessfd
, p
, size_bufp
)) > 0)
4331 process_pppoe_sess(p
, s
);
4336 pppoesess_ready
= 0;
4344 alen
= sizeof(addr
);
4345 if ((s
= recvfrom(cluster_sockfd
, p
, size_bufp
, MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
4347 processcluster(p
, s
, addr
.sin_addr
.s_addr
);
4358 if (udp_pkts
[0] > 1 || tun_pkts
> 1 || cluster_pkts
> 1)
4359 STAT(multi_read_used
);
4361 if (c
>= config
->multi_read_count
)
4363 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4364 config
->multi_read_count
, udp_pkts
[0], tun_pkts
, cluster_pkts
, pppoesess_pkts
);
4365 STAT(multi_read_exceeded
);
4371 /* no event received, but timers could still have expired */
4372 bgp_process_peers_timers();
4377 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
4379 // Log current traffic stats
4380 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4381 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4382 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
4383 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
4384 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
4386 udp_tx
= udp_rx
= 0;
4387 udp_rx_pkt
= eth_rx_pkt
= 0;
4388 eth_tx
= eth_rx
= 0;
4391 if (config
->dump_speed
)
4392 printf("%s\n", config
->bandwidth
);
4394 // Update the internal time counter
4395 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4399 struct param_timer p
= { time_now
};
4400 run_plugins(PLUGIN_TIMER
, &p
);
4404 // Runs on every machine (master and slaves).
4405 if (next_cluster_ping
<= TIME
)
4407 // Check to see which of the cluster is still alive..
4409 cluster_send_ping(basetime
); // Only does anything if we're a slave
4410 cluster_check_master(); // ditto.
4412 cluster_heartbeat(); // Only does anything if we're a master.
4413 cluster_check_slaves(); // ditto.
4415 master_update_counts(); // If we're a slave, send our byte counters to our master.
4417 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
4418 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
4420 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
4423 if (!config
->cluster_iam_master
)
4426 // Run token bucket filtering queue..
4427 // Only run it every 1/10th of a second.
4429 static clockt last_run
= 0;
4430 if (last_run
!= TIME
)
4437 // Handle timeouts, retries etc.
4439 static double last_clean
= 0;
4443 TIME
= now(&this_clean
);
4444 diff
= this_clean
- last_clean
;
4446 // Run during idle time (after we've handled
4447 // all incoming packets) or every 1/10th sec
4448 if (!more
|| diff
> 0.1)
4450 regular_cleanups(diff
);
4451 last_clean
= this_clean
;
4455 if (*config
->accounting_dir
)
4457 static clockt next_acct
= 0;
4458 static clockt next_shut_acct
= 0;
4460 if (next_acct
<= TIME
)
4462 // Dump accounting data
4463 next_acct
= TIME
+ ACCT_TIME
;
4464 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4467 else if (next_shut_acct
<= TIME
)
4469 // Dump accounting data for shutdown sessions
4470 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4477 // Are we the master and shutting down??
4478 if (config
->cluster_iam_master
)
4479 cluster_heartbeat(); // Flush any queued changes..
4481 // Ok. Notify everyone we're shutting down. If we're
4482 // the master, this will force an election.
4483 cluster_send_ping(0);
4486 // Important!!! We MUST not process any packets past this point!
4487 LOG(1, 0, 0, "Shutdown complete\n");
4490 static void stripdomain(char *host
)
4494 if ((p
= strchr(host
, '.')))
4500 FILE *resolv
= fopen("/etc/resolv.conf", "r");
4506 while (fgets(buf
, sizeof(buf
), resolv
))
4508 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
4511 if (!isspace(buf
[6]))
4515 while (isspace(*b
)) b
++;
4520 while (*b
&& !isspace(*b
)) b
++;
4522 if (buf
[0] == 'd') // domain is canonical
4528 // first search line
4531 // hold, may be subsequent domain line
4532 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
4543 int hl
= strlen(host
);
4544 int dl
= strlen(domain
);
4545 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
4546 host
[hl
-dl
- 1] = 0;
4550 *p
= 0; // everything after first dot
4555 // Init data structures
4556 static void initdata(int optdebug
, char *optconfig
)
4560 if (!(config
= shared_malloc(sizeof(configt
))))
4562 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
4566 memset(config
, 0, sizeof(configt
));
4567 time(&config
->start_time
);
4568 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
4569 config
->debug
= optdebug
;
4570 config
->num_tbfs
= MAXTBFS
;
4571 config
->rl_rate
= 28; // 28kbps
4572 config
->cluster_mcast_ttl
= 1;
4573 config
->cluster_master_min_adv
= 1;
4574 config
->ppp_restart_time
= 3;
4575 config
->ppp_max_configure
= 10;
4576 config
->ppp_max_failure
= 5;
4577 config
->kill_timedout_sessions
= 1;
4578 strcpy(config
->random_device
, RANDOMDEVICE
);
4579 // Set default value echo_timeout and idle_echo_timeout
4580 config
->echo_timeout
= ECHO_TIMEOUT
;
4581 config
->idle_echo_timeout
= IDLE_ECHO_TIMEOUT
;
4583 log_stream
= stderr
;
4586 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
4588 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
4591 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
4594 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
4596 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
4599 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
4601 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
4604 if (!(bundle
= shared_malloc(sizeof(bundlet
) * MAXBUNDLE
)))
4606 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno
));
4609 if (!(frag
= shared_malloc(sizeof(fragmentationt
) * MAXBUNDLE
)))
4611 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno
));
4614 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
4616 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
4620 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
4622 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
4626 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
4628 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
4632 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
4634 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
4638 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
4640 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
4643 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
4645 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
4647 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
4650 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
4652 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
4654 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
4657 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
4659 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
4660 memset(bundle
, 0, sizeof(bundlet
) * MAXBUNDLE
);
4661 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
4662 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
4663 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
4665 // Put all the sessions on the free list marked as undefined.
4666 for (i
= 1; i
< MAXSESSION
; i
++)
4668 session
[i
].next
= i
+ 1;
4669 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
4671 session
[MAXSESSION
- 1].next
= 0;
4674 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4675 for (i
= 1; i
< MAXTUNNEL
; i
++)
4676 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
4678 for (i
= 1; i
< MAXBUNDLE
; i
++) {
4679 bundle
[i
].state
= BUNDLEUNDEF
;
4684 // Grab my hostname unless it's been specified
4685 gethostname(hostname
, sizeof(hostname
));
4686 stripdomain(hostname
);
4689 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
4692 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
4694 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
4699 lac_initremotelnsdata();
4702 static int assign_ip_address(sessionidt s
)
4706 time_t best_time
= time_now
;
4707 char *u
= session
[s
].user
;
4711 CSTAT(assign_ip_address
);
4713 for (i
= 1; i
< ip_pool_size
; i
++)
4715 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
4718 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
4725 if (ip_address_pool
[i
].last
< best_time
)
4728 if (!(best_time
= ip_address_pool
[i
].last
))
4729 break; // never used, grab this one
4735 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
4739 session
[s
].ip
= ip_address_pool
[best
].address
;
4740 session
[s
].ip_pool_index
= best
;
4741 ip_address_pool
[best
].assigned
= 1;
4742 ip_address_pool
[best
].last
= time_now
;
4743 ip_address_pool
[best
].session
= s
;
4744 if (session
[s
].walled_garden
)
4745 /* Don't track addresses of users in walled garden (note: this
4746 means that their address isn't "sticky" even if they get
4748 ip_address_pool
[best
].user
[0] = 0;
4750 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
4753 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
4754 reuse
? "Reusing" : "Allocating", best
);
4759 static void free_ip_address(sessionidt s
)
4761 int i
= session
[s
].ip_pool_index
;
4764 CSTAT(free_ip_address
);
4767 return; // what the?
4769 if (i
< 0) // Is this actually part of the ip pool?
4773 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
4775 ip_address_pool
[i
].assigned
= 0;
4776 ip_address_pool
[i
].session
= 0;
4777 ip_address_pool
[i
].last
= time_now
;
4781 // Fsck the address pool against the session table.
4782 // Normally only called when we become a master.
4784 // This isn't perfect: We aren't keep tracking of which
4785 // users used to have an IP address.
4787 void rebuild_address_pool(void)
4792 // Zero the IP pool allocation, and build
4793 // a map from IP address to pool index.
4794 for (i
= 1; i
< MAXIPPOOL
; ++i
)
4796 ip_address_pool
[i
].assigned
= 0;
4797 ip_address_pool
[i
].session
= 0;
4798 if (!ip_address_pool
[i
].address
)
4801 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
4804 for (i
= 0; i
< MAXSESSION
; ++i
)
4807 if (!(session
[i
].opened
&& session
[i
].ip
))
4810 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
4812 if (session
[i
].ip_pool_index
< 0)
4814 // Not allocated out of the pool.
4815 if (ipid
< 1) // Not found in the pool either? good.
4818 LOG(0, i
, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4819 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
4821 // Fall through and process it as part of the pool.
4825 if (ipid
> MAXIPPOOL
|| ipid
< 0)
4827 LOG(0, i
, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
4829 session
[i
].ip_pool_index
= ipid
;
4833 ip_address_pool
[ipid
].assigned
= 1;
4834 ip_address_pool
[ipid
].session
= i
;
4835 ip_address_pool
[ipid
].last
= time_now
;
4836 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4837 session
[i
].ip_pool_index
= ipid
;
4838 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
4843 // Fix the address pool to match a changed session.
4844 // (usually when the master sends us an update).
4845 static void fix_address_pool(int sid
)
4849 ipid
= session
[sid
].ip_pool_index
;
4851 if (ipid
> ip_pool_size
)
4852 return; // Ignore it. rebuild_address_pool will fix it up.
4854 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
4855 return; // Just ignore it. rebuild_address_pool will take care of it.
4857 ip_address_pool
[ipid
].assigned
= 1;
4858 ip_address_pool
[ipid
].session
= sid
;
4859 ip_address_pool
[ipid
].last
= time_now
;
4860 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4864 // Add a block of addresses to the IP pool to hand out.
4866 static void add_to_ip_pool(in_addr_t addr
, int prefixlen
)
4870 prefixlen
= 32; // Host route only.
4872 addr
&= 0xffffffff << (32 - prefixlen
);
4874 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
4877 for (i
= addr
; i
< addr
+(1<<(32-prefixlen
)); ++i
)
4879 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
4880 continue; // Skip 0 and broadcast addresses.
4882 ip_address_pool
[ip_pool_size
].address
= i
;
4883 ip_address_pool
[ip_pool_size
].assigned
= 0;
4885 if (ip_pool_size
>= MAXIPPOOL
)
4887 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
4893 // Initialize the IP address pool
4894 static void initippool()
4899 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
4901 if (!(f
= fopen(IPPOOLFILE
, "r")))
4903 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
4907 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
4910 buf
[4095] = 0; // Force it to be zero terminated/
4912 if (*buf
== '#' || *buf
== '\n')
4913 continue; // Skip comments / blank lines
4914 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
4915 if ((p
= (char *)strchr(buf
, ':')))
4919 src
= inet_addr(buf
);
4920 if (src
== INADDR_NONE
)
4922 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
4925 // This entry is for a specific IP only
4926 if (src
!= config
->bind_address
)
4931 if ((p
= (char *)strchr(pool
, '/')))
4935 in_addr_t start
= 0;
4937 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
4939 if (!*p
|| !(numbits
= atoi(p
)))
4941 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
4944 start
= ntohl(inet_addr(pool
));
4946 // Add a static route for this pool
4947 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4948 fmtaddr(htonl(start
), 0), numbits
);
4950 routeset(0, start
, numbits
, 0, 1);
4952 add_to_ip_pool(start
, numbits
);
4956 // It's a single ip address
4957 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
4961 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
4964 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
4966 struct sockaddr_in snoop_addr
= {0};
4967 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
4970 snoop_addr
.sin_family
= AF_INET
;
4971 snoop_addr
.sin_addr
.s_addr
= destination
;
4972 snoop_addr
.sin_port
= ntohs(port
);
4974 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size
,
4975 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
4976 htons(snoop_addr
.sin_port
));
4978 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
4979 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
4981 STAT(packets_snooped
);
4984 static int dump_session(FILE **f
, sessiont
*s
)
4986 if (!s
->opened
|| (!s
->ip
&& !s
->forwardtosession
) || !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4991 char filename
[1024];
4993 time_t now
= time(NULL
);
4995 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4996 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4998 if (!(*f
= fopen(filename
, "w")))
5000 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
5004 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
5005 if(config
->account_all_origin
)
5007 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
5012 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
5014 fmtaddr(config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] ? config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] : my_address
, 0),
5020 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
5025 "# format: username ip qos uptxoctets downrxoctets\n",
5027 fmtaddr(config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] ? config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] : my_address
, 0),
5033 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
5034 if(config
->account_all_origin
)
5036 fprintf(*f
, "%s %s %d %u %u %s\n",
5037 s
->user
, // username
5038 fmtaddr(htonl(s
->ip
), 0), // ip
5039 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
5040 (uint32_t) s
->cin_delta
, // uptxoctets
5041 (uint32_t) s
->cout_delta
, // downrxoctets
5042 (s
->tunnel
== TUNNEL_ID_PPPOE
)?"P":(tunnel
[s
->tunnel
].isremotelns
?"R":"L")); // Origin
5044 else if (!tunnel
[s
->tunnel
].isremotelns
&& (s
->tunnel
!= TUNNEL_ID_PPPOE
))
5046 fprintf(*f
, "%s %s %d %u %u\n",
5047 s
->user
, // username
5048 fmtaddr(htonl(s
->ip
), 0), // ip
5049 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
5050 (uint32_t) s
->cin_delta
, // uptxoctets
5051 (uint32_t) s
->cout_delta
); // downrxoctets
5054 s
->cin_delta
= s
->cout_delta
= 0;
5059 static void dump_acct_info(int all
)
5065 CSTAT(dump_acct_info
);
5069 for (i
= 0; i
< shut_acct_n
; i
++)
5070 dump_session(&f
, &shut_acct
[i
]);
5076 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5077 dump_session(&f
, &session
[i
]);
5084 int main(int argc
, char *argv
[])
5088 char *optconfig
= CONFIGFILE
;
5090 time(&basetime
); // start clock
5093 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
5098 if (fork()) exit(0);
5100 if(!freopen("/dev/null", "r", stdin
)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno
));
5101 if(!freopen("/dev/null", "w", stdout
)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno
));
5102 if(!freopen("/dev/null", "w", stderr
)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno
));
5111 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
5114 printf("Args are:\n"
5115 "\t-d\t\tDetach from terminal\n"
5116 "\t-c <file>\tConfig file\n"
5117 "\t-h <hostname>\tForce hostname\n"
5125 // Start the timer routine off
5127 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
5130 initdata(optdebug
, optconfig
);
5134 /* set hostname /after/ having read the config file */
5135 if (*config
->hostname
)
5136 strcpy(hostname
, config
->hostname
);
5137 cli_init_complete(hostname
);
5139 init_tbf(config
->num_tbfs
);
5141 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
5142 LOG(0, 0, 0, "Copyright (c) 2012, 2013, 2014 ISP FDN & SAMESWIRELESS\n");
5143 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5144 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5147 rlim
.rlim_cur
= RLIM_INFINITY
;
5148 rlim
.rlim_max
= RLIM_INFINITY
;
5149 // Remove the maximum core size
5150 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
5151 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
5153 // Make core dumps go to /tmp
5154 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno
));
5157 if (config
->scheduler_fifo
)
5160 struct sched_param params
= {0};
5161 params
.sched_priority
= 1;
5163 if (get_nprocs() < 2)
5165 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5166 config
->scheduler_fifo
= 0;
5170 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
5172 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5176 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
5177 config
->scheduler_fifo
= 0;
5184 /* Set up the cluster communications port. */
5185 if (cluster_init() < 0)
5189 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevicename
);
5191 if (*config
->pppoe_if_to_bind
)
5194 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config
->pppoe_if_to_bind
);
5197 if (!config
->nbmultiaddress
)
5199 config
->bind_n_address
[0] = config
->bind_address
;
5200 config
->nbmultiaddress
++;
5202 config
->nbudpfd
= config
->nbmultiaddress
;
5203 for (i
= 0; i
< config
->nbudpfd
; i
++)
5204 initudp(&udpfd
[i
], config
->bind_n_address
[i
]);
5206 config
->indexlacudpfd
= config
->nbudpfd
;
5207 udpfd
[config
->indexlacudpfd
] = udplacfd
;
5214 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
5222 unsigned seed
= time_now
^ getpid();
5223 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
5227 signal(SIGHUP
, sighup_handler
);
5228 signal(SIGCHLD
, sigchild_handler
);
5229 signal(SIGTERM
, shutdown_handler
);
5230 signal(SIGINT
, shutdown_handler
);
5231 signal(SIGQUIT
, shutdown_handler
);
5233 // Prevent us from getting paged out
5234 if (config
->lock_pages
)
5236 if (!mlockall(MCL_CURRENT
))
5237 LOG(1, 0, 0, "Locking pages into memory\n");
5239 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
5244 /* remove plugins (so cleanup code gets run) */
5247 // Remove the PID file if we wrote it
5248 if (config
->wrote_pid
&& *config
->pid_file
== '/')
5249 unlink(config
->pid_file
);
5251 /* kill CLI children */
5252 signal(SIGTERM
, SIG_IGN
);
5257 static void sighup_handler(int sig
)
5262 static void shutdown_handler(int sig
)
5264 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
5267 static void sigchild_handler(int sig
)
5269 while (waitpid(-1, NULL
, WNOHANG
) > 0)
5273 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
5276 *challenge_response
= NULL
;
5278 if (!*config
->l2tp_secret
)
5280 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5284 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5286 *challenge_response
= calloc(17, 1);
5289 MD5_Update(&ctx
, &id
, 1);
5290 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5291 MD5_Update(&ctx
, challenge
, challenge_length
);
5292 MD5_Final(*challenge_response
, &ctx
);
5297 static int facility_value(char *name
)
5300 for (i
= 0; facilitynames
[i
].c_name
; i
++)
5302 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
5303 return facilitynames
[i
].c_val
;
5308 static void update_config()
5312 static int timeout
= 0;
5313 static int interval
= 0;
5320 if (log_stream
!= stderr
)
5326 if (*config
->log_filename
)
5328 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
5330 char *p
= config
->log_filename
+ 7;
5333 openlog("l2tpns", LOG_PID
, facility_value(p
));
5337 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
5339 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
5341 fseek(log_stream
, 0, SEEK_END
);
5342 setbuf(log_stream
, NULL
);
5346 log_stream
= stderr
;
5347 setbuf(log_stream
, NULL
);
5353 log_stream
= stderr
;
5354 setbuf(log_stream
, NULL
);
5357 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5358 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5360 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
5361 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
5362 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
5364 // reset MRU/MSS globals
5365 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
5366 if (MRU
> PPPoE_MRU
)
5369 MSS
= MRU
- TCP_HDRS
;
5372 config
->numradiusservers
= 0;
5373 for (i
= 0; i
< MAXRADSERVER
; i
++)
5374 if (config
->radiusserver
[i
])
5376 config
->numradiusservers
++;
5377 // Set radius port: if not set, take the port from the
5378 // first radius server. For the first radius server,
5379 // take the #defined default value from l2tpns.h
5381 // test twice, In case someone works with
5382 // a secondary radius server without defining
5383 // a primary one, this will work even then.
5384 if (i
> 0 && !config
->radiusport
[i
])
5385 config
->radiusport
[i
] = config
->radiusport
[i
-1];
5386 if (!config
->radiusport
[i
])
5387 config
->radiusport
[i
] = RADPORT
;
5390 if (!config
->numradiusservers
)
5391 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5393 // parse radius_authtypes_s
5394 config
->radius_authtypes
= config
->radius_authprefer
= 0;
5395 p
= config
->radius_authtypes_s
;
5398 char *s
= strpbrk(p
, " \t,");
5404 while (*s
== ' ' || *s
== '\t')
5411 if (!strncasecmp("chap", p
, strlen(p
)))
5413 else if (!strncasecmp("pap", p
, strlen(p
)))
5416 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
5418 config
->radius_authtypes
|= type
;
5419 if (!config
->radius_authprefer
)
5420 config
->radius_authprefer
= type
;
5425 if (!config
->radius_authtypes
)
5427 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5428 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
5431 // normalise radius_authtypes_s
5432 if (config
->radius_authprefer
== AUTHPAP
)
5434 strcpy(config
->radius_authtypes_s
, "pap");
5435 if (config
->radius_authtypes
& AUTHCHAP
)
5436 strcat(config
->radius_authtypes_s
, ", chap");
5440 strcpy(config
->radius_authtypes_s
, "chap");
5441 if (config
->radius_authtypes
& AUTHPAP
)
5442 strcat(config
->radius_authtypes_s
, ", pap");
5445 if (!config
->radius_dae_port
)
5446 config
->radius_dae_port
= DAEPORT
;
5448 if(!config
->bind_portremotelns
)
5449 config
->bind_portremotelns
= L2TPLACPORT
;
5450 if(!config
->bind_address_remotelns
)
5451 config
->bind_address_remotelns
= INADDR_ANY
;
5453 if (*config
->bind_multi_address
)
5455 char *sip
= config
->bind_multi_address
;
5457 char *e
= config
->bind_multi_address
+ strlen(config
->bind_multi_address
);
5458 config
->nbmultiaddress
= 0;
5460 while (*sip
&& (sip
< e
))
5465 while (n
< e
&& (*n
== ',' || *n
== ' ')) n
++;
5467 while (n
< e
&& (isdigit(*n
) || *n
== '.'))
5475 u
= u
* 10 + *n
- '0';
5483 config
->bind_n_address
[config
->nbmultiaddress
] = htonl(ip
);
5484 config
->iftun_n_address
[config
->nbmultiaddress
] = htonl(ip
);
5485 config
->nbmultiaddress
++;
5486 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip
), 0));
5488 if (config
->nbmultiaddress
>= MAX_BINDADDR
) break;
5494 if (config
->nbmultiaddress
>= 1)
5496 config
->bind_address
= config
->bind_n_address
[0];
5497 config
->iftun_address
= config
->bind_address
;
5501 if(!config
->iftun_address
)
5503 config
->iftun_address
= config
->bind_address
;
5504 config
->iftun_n_address
[0] = config
->iftun_address
;
5507 if (*config
->multi_hostname
)
5509 char *shost
= config
->multi_hostname
;
5511 char *e
= config
->multi_hostname
+ strlen(config
->multi_hostname
);
5512 config
->nbmultihostname
= 0;
5514 while (*shost
&& (shost
< e
))
5516 while ((n
< e
) && (*n
== ' ' || *n
== ',' || *n
== '\t')) n
++;
5519 while (n
< e
&& (*n
!= ',') && (*n
!= '\t'))
5521 config
->multi_n_hostname
[config
->nbmultihostname
][i
] = *n
;
5527 config
->multi_n_hostname
[config
->nbmultihostname
][i
] = 0;
5528 LOG(1, 0, 0, "Bind Hostname %s\n", config
->multi_n_hostname
[config
->nbmultihostname
]);
5529 config
->nbmultihostname
++;
5530 if (config
->nbmultihostname
>= MAX_NBHOSTNAME
) break;
5536 if (config
->nbmultihostname
>= 1)
5538 strcpy(hostname
, config
->multi_n_hostname
[0]);
5539 strcpy(config
->hostname
, hostname
);
5543 if (!*config
->pppoe_ac_name
)
5544 strncpy(config
->pppoe_ac_name
, DEFAULT_PPPOE_AC_NAME
, sizeof(config
->pppoe_ac_name
) - 1);
5546 // re-initialise the random number source
5547 initrandom(config
->random_device
);
5550 for (i
= 0; i
< MAXPLUGINS
; i
++)
5552 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
5555 if (*config
->plugins
[i
])
5558 add_plugin(config
->plugins
[i
]);
5560 else if (*config
->old_plugins
[i
])
5563 remove_plugin(config
->old_plugins
[i
]);
5568 guest_accounts_num
= 0;
5569 char *p2
= config
->guest_user
;
5572 char *s
= strpbrk(p2
, " \t,");
5576 while (*s
== ' ' || *s
== '\t')
5583 strcpy(guest_users
[guest_accounts_num
], p2
);
5584 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num
, guest_users
[guest_accounts_num
]);
5585 guest_accounts_num
++;
5588 // Rebuild the guest_user array
5589 strcpy(config
->guest_user
, "");
5591 for (ui
=0; ui
<guest_accounts_num
; ui
++)
5593 strcat(config
->guest_user
, guest_users
[ui
]);
5594 if (ui
<guest_accounts_num
-1)
5596 strcat(config
->guest_user
, ",");
5601 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
5602 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
5603 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
5604 if (!*config
->cluster_interface
)
5605 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
5607 if (!config
->cluster_hb_interval
)
5608 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
5610 if (!config
->cluster_hb_timeout
)
5611 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
5613 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
5615 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5616 // late, ensure we're sufficiently larger than that
5617 int t
= 4 * config
->cluster_hb_interval
+ 11;
5619 if (config
->cluster_hb_timeout
< t
)
5621 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
5622 config
->cluster_hb_timeout
= t
;
5625 // Push timing changes to the slaves immediately if we're the master
5626 if (config
->cluster_iam_master
)
5627 cluster_heartbeat();
5629 interval
= config
->cluster_hb_interval
;
5630 timeout
= config
->cluster_hb_timeout
;
5634 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
5637 if ((f
= fopen(config
->pid_file
, "w")))
5639 fprintf(f
, "%d\n", getpid());
5641 config
->wrote_pid
= 1;
5645 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
5650 static void read_config_file()
5654 if (!config
->config_file
) return;
5655 if (!(f
= fopen(config
->config_file
, "r")))
5657 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
5661 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
5663 LOG(3, 0, 0, "Done reading config file\n");
5667 int sessionsetup(sessionidt s
, tunnelidt t
)
5669 // A session now exists, set it up
5675 CSTAT(sessionsetup
);
5677 LOG(3, s
, t
, "Doing session setup for session\n");
5679 // Join a bundle if the MRRU option is accepted
5680 if(session
[s
].mrru
> 0 && session
[s
].bundle
== 0)
5682 LOG(3, s
, t
, "This session can be part of multilink bundle\n");
5683 if (join_bundle(s
) > 0)
5684 cluster_send_bundle(session
[s
].bundle
);
5687 LOG(0, s
, t
, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5688 sessionshutdown(s
, "Mismaching mssf option.", CDN_NONE
, TERM_SERVICE_UNAVAILABLE
);
5695 assign_ip_address(s
);
5698 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
5699 sessionshutdown(s
, "No IP addresses available.", CDN_TRY_ANOTHER
, TERM_SERVICE_UNAVAILABLE
);
5702 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
5703 fmtaddr(htonl(session
[s
].ip
), 0));
5706 // Make sure this is right
5707 session
[s
].tunnel
= t
;
5709 // zap old sessions with same IP and/or username
5710 // Don't kill gardened sessions - doing so leads to a DoS
5711 // from someone who doesn't need to know the password
5714 user
= session
[s
].user
;
5715 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5717 if (i
== s
) continue;
5718 if (!session
[s
].opened
) break;
5719 // Allow duplicate sessions for multilink ones of the same bundle.
5720 if (session
[s
].bundle
&& session
[i
].bundle
&& session
[s
].bundle
== session
[i
].bundle
) continue;
5722 if (ip
== session
[i
].ip
)
5724 sessionshutdown(i
, "Duplicate IP address", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5728 if (config
->allow_duplicate_users
) continue;
5729 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
5733 for (gu
= 0; gu
< guest_accounts_num
; gu
++)
5735 if (!strcasecmp(user
, guest_users
[gu
]))
5741 if (found
) continue;
5743 // Drop the new session in case of duplicate sessionss, not the old one.
5744 if (!strcasecmp(user
, session
[i
].user
))
5745 sessionshutdown(i
, "Duplicate session for users", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5749 // no need to set a route for the same IP address of the bundle
5750 if (!session
[s
].bundle
|| (bundle
[session
[s
].bundle
].num_of_links
== 1))
5754 // Add the route for this session.
5755 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
5757 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
5758 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
5761 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 1);
5764 // Static IPs need to be routed if not already
5765 // convered by a Framed-Route. Anything else is part
5766 // of the IP address pool and is already routed, it
5767 // just needs to be added to the IP cache.
5768 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5769 if (session
[s
].ip_pool_index
== -1) // static ip
5771 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
5774 cache_ipmap(session
[s
].ip
, s
);
5777 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
5778 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
5780 // Run the plugin's against this new session.
5782 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
5783 run_plugins(PLUGIN_NEW_SESSION
, &data
);
5786 // Allocate TBFs if throttled
5787 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
5788 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
5790 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
5792 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
5793 fmtaddr(htonl(session
[s
].ip
), 0),
5794 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
5796 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
5798 return 1; // RADIUS OK and IP allocated, done...
5802 // This session just got dropped on us by the master or something.
5803 // Make sure our tables up up to date...
5805 int load_session(sessionidt s
, sessiont
*new)
5811 if (new->ip_pool_index
>= MAXIPPOOL
||
5812 new->tunnel
>= MAXTUNNEL
)
5814 LOG(0, s
, 0, "Strange session update received!\n");
5815 // FIXME! What to do here?
5820 // Ok. All sanity checks passed. Now we're committed to
5821 // loading the new session.
5824 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
5826 // See if routes/ip cache need updating
5827 if (new->ip
!= session
[s
].ip
)
5830 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
5831 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
5832 new->route
[i
].prefixlen
!= session
[s
].route
[i
].prefixlen
)
5840 // remove old routes...
5841 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
5843 if ((session
[s
].ip
>> (32-session
[s
].route
[i
].prefixlen
)) ==
5844 (session
[s
].route
[i
].ip
>> (32-session
[s
].route
[i
].prefixlen
)))
5847 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].prefixlen
, 0, 0);
5853 if (session
[s
].ip_pool_index
== -1) // static IP
5855 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
5857 else // It's part of the IP pool, remove it manually.
5858 uncache_ipmap(session
[s
].ip
);
5861 // remove old IPV6 routes...
5862 for (i
= 0; i
< MAXROUTE6
&& session
[s
].route6
[i
].ipv6route
.s6_addr
[0] && session
[s
].route6
[i
].ipv6prefixlen
; i
++)
5864 route6set(s
, session
[s
].route6
[i
].ipv6route
, session
[s
].route6
[i
].ipv6prefixlen
, 0);
5867 if (session
[s
].ipv6address
.s6_addr
[0])
5869 route6set(s
, session
[s
].ipv6address
, 128, 0);
5874 // add new routes...
5875 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
5877 if ((new->ip
>> (32-new->route
[i
].prefixlen
)) ==
5878 (new->route
[i
].ip
>> (32-new->route
[i
].prefixlen
)))
5881 routeset(s
, new->route
[i
].ip
, new->route
[i
].prefixlen
, 0, 1);
5887 // If there's a new one, add it.
5888 if (new->ip_pool_index
== -1)
5890 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
5893 cache_ipmap(new->ip
, s
);
5898 for (i
= 0; i
< MAXROUTE6
&& new->route6
[i
].ipv6prefixlen
; i
++)
5900 route6set(s
, new->route6
[i
].ipv6route
, new->route6
[i
].ipv6prefixlen
, 1);
5903 if (new->ipv6address
.s6_addr
[0] && new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5905 // Check if included in prefix
5906 if (sessionbyipv6(new->ipv6address
) != s
)
5907 route6set(s
, new->ipv6address
, 128, 1);
5911 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
5913 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %u\n", (int) new->filter_in
);
5917 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
5919 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %u\n", (int) new->filter_out
);
5920 new->filter_out
= 0;
5923 if (new->filter_in
!= session
[s
].filter_in
)
5925 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
5926 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
5929 if (new->filter_out
!= session
[s
].filter_out
)
5931 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
5932 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
5935 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
5936 // for walking the sessions to forward byte counts to the master.
5937 config
->cluster_highest_sessionid
= s
;
5939 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
5941 // Do fixups into address pool.
5942 if (new->ip_pool_index
!= -1)
5943 fix_address_pool(s
);
5948 static void initplugins()
5952 loaded_plugins
= ll_init();
5953 // Initialize the plugins to nothing
5954 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
5955 plugins
[i
] = ll_init();
5958 static void *open_plugin(char *plugin_name
, int load
)
5960 char path
[256] = "";
5962 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
5963 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
5964 return dlopen(path
, RTLD_NOW
);
5967 // plugin callback to get a config value
5968 static void *getconfig(char *key
, enum config_typet type
)
5972 for (i
= 0; config_values
[i
].key
; i
++)
5974 if (!strcmp(config_values
[i
].key
, key
))
5976 if (config_values
[i
].type
== type
)
5977 return ((void *) config
) + config_values
[i
].offset
;
5979 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5980 key
, type
, config_values
[i
].type
);
5986 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
5990 static int add_plugin(char *plugin_name
)
5992 static struct pluginfuncs funcs
= {
5997 sessiontbysessionidt
,
5998 sessionidtbysessiont
,
6005 cluster_send_session
,
6008 void *p
= open_plugin(plugin_name
, 1);
6009 int (*initfunc
)(struct pluginfuncs
*);
6014 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
6018 if (ll_contains(loaded_plugins
, p
))
6021 return 0; // already loaded
6025 int *v
= dlsym(p
, "plugin_api_version");
6026 if (!v
|| *v
!= PLUGIN_API_VERSION
)
6028 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
6034 if ((initfunc
= dlsym(p
, "plugin_init")))
6036 if (!initfunc(&funcs
))
6038 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6044 ll_push(loaded_plugins
, p
);
6046 for (i
= 0; i
< max_plugin_functions
; i
++)
6049 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
6051 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
6052 ll_push(plugins
[i
], x
);
6056 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
6060 static void run_plugin_done(void *plugin
)
6062 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
6068 static int remove_plugin(char *plugin_name
)
6070 void *p
= open_plugin(plugin_name
, 0);
6076 if (ll_contains(loaded_plugins
, p
))
6079 for (i
= 0; i
< max_plugin_functions
; i
++)
6082 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
6083 ll_delete(plugins
[i
], x
);
6086 ll_delete(loaded_plugins
, p
);
6092 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
6096 int run_plugins(int plugin_type
, void *data
)
6098 int (*func
)(void *data
);
6100 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
6101 return PLUGIN_RET_ERROR
;
6103 ll_reset(plugins
[plugin_type
]);
6104 while ((func
= ll_next(plugins
[plugin_type
])))
6108 if (r
!= PLUGIN_RET_OK
)
6109 return r
; // stop here
6112 return PLUGIN_RET_OK
;
6115 static void plugins_done()
6119 ll_reset(loaded_plugins
);
6120 while ((p
= ll_next(loaded_plugins
)))
6124 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
6126 struct nsctl request
;
6127 struct nsctl response
;
6128 int type
= unpack_control(&request
, buf
, len
);
6132 if (log_stream
&& config
->debug
>= 4)
6136 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6137 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
6141 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
6142 dump_control(&request
, log_stream
);
6148 case NSCTL_REQ_LOAD
:
6149 if (request
.argc
!= 1)
6151 response
.type
= NSCTL_RES_ERR
;
6153 response
.argv
[0] = "name of plugin required";
6155 else if ((r
= add_plugin(request
.argv
[0])) < 1)
6157 response
.type
= NSCTL_RES_ERR
;
6159 response
.argv
[0] = !r
6160 ? "plugin already loaded"
6161 : "error loading plugin";
6165 response
.type
= NSCTL_RES_OK
;
6171 case NSCTL_REQ_UNLOAD
:
6172 if (request
.argc
!= 1)
6174 response
.type
= NSCTL_RES_ERR
;
6176 response
.argv
[0] = "name of plugin required";
6178 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
6180 response
.type
= NSCTL_RES_ERR
;
6182 response
.argv
[0] = !r
6183 ? "plugin not loaded"
6184 : "plugin not found";
6188 response
.type
= NSCTL_RES_OK
;
6194 case NSCTL_REQ_HELP
:
6195 response
.type
= NSCTL_RES_OK
;
6198 ll_reset(loaded_plugins
);
6199 while ((p
= ll_next(loaded_plugins
)))
6201 char **help
= dlsym(p
, "plugin_control_help");
6202 while (response
.argc
< 0xff && help
&& *help
)
6203 response
.argv
[response
.argc
++] = *help
++;
6208 case NSCTL_REQ_CONTROL
:
6210 struct param_control param
= {
6211 config
->cluster_iam_master
,
6218 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
6220 if (r
== PLUGIN_RET_ERROR
)
6222 response
.type
= NSCTL_RES_ERR
;
6224 response
.argv
[0] = param
.additional
6226 : "error returned by plugin";
6228 else if (r
== PLUGIN_RET_NOTMASTER
)
6230 static char msg
[] = "must be run on master: 000.000.000.000";
6232 response
.type
= NSCTL_RES_ERR
;
6234 if (config
->cluster_master_address
)
6236 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
6237 response
.argv
[0] = msg
;
6241 response
.argv
[0] = "must be run on master: none elected";
6244 else if (!(param
.response
& NSCTL_RESPONSE
))
6246 response
.type
= NSCTL_RES_ERR
;
6248 response
.argv
[0] = param
.response
6249 ? "unrecognised response value from plugin"
6250 : "unhandled action";
6254 response
.type
= param
.response
;
6256 if (param
.additional
)
6259 response
.argv
[0] = param
.additional
;
6267 response
.type
= NSCTL_RES_ERR
;
6269 response
.argv
[0] = "error unpacking control packet";
6272 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
6275 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6279 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
6282 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
6283 if (log_stream
&& config
->debug
>= 4)
6285 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
6286 dump_control(&response
, log_stream
);
6290 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6291 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
6296 static tunnelidt
new_tunnel()
6299 for (i
= 1; i
< MAXTUNNEL
; i
++)
6301 if ((tunnel
[i
].state
== TUNNELFREE
) && (i
!= TUNNEL_ID_PPPOE
))
6303 LOG(4, 0, i
, "Assigning tunnel ID %u\n", i
);
6304 if (i
> config
->cluster_highest_tunnelid
)
6305 config
->cluster_highest_tunnelid
= i
;
6309 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6314 // We're becoming the master. Do any required setup..
6316 // This is principally telling all the plugins that we're
6317 // now a master, and telling them about all the sessions
6318 // that are active too..
6320 void become_master(void)
6323 static struct event_data d
[RADIUS_FDS
];
6324 struct epoll_event e
;
6326 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
6328 // running a bunch of iptables commands is slow and can cause
6329 // the master to drop tunnels on takeover--kludge around the
6330 // problem by forking for the moment (note: race)
6331 if (!fork_and_close())
6333 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6335 if (!session
[s
].opened
) // Not an in-use session.
6338 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
6345 for (i
= 0; i
< RADIUS_FDS
; i
++)
6347 d
[i
].type
= FD_TYPE_RADIUS
;
6351 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
6355 int cmd_show_hist_idle(struct cli_def
*cli
, const char *command
, char **argv
, int argc
)
6361 if (CLI_HELP_REQUESTED
)
6362 return CLI_HELP_NO_ARGS
;
6365 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6367 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6370 if (!session
[s
].opened
)
6373 idle
= time_now
- session
[s
].last_data
;
6374 idle
/= 5 ; // In multiples of 5 seconds.
6384 for (i
= 0; i
< 63; ++i
)
6386 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6388 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
6389 cli_print(cli
, "%d total sessions open.", count
);
6393 int cmd_show_hist_open(struct cli_def
*cli
, const char *command
, char **argv
, int argc
)
6399 if (CLI_HELP_REQUESTED
)
6400 return CLI_HELP_NO_ARGS
;
6403 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6405 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6408 if (!session
[s
].opened
)
6411 d
= time_now
- session
[s
].opened
;
6414 while (d
> 1 && open
< 32)
6424 for (i
= 0; i
< 30; ++i
)
6426 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6429 cli_print(cli
, "%d total sessions open.", count
);
6435 * This unencodes the AVP using the L2TP secret and the previously
6436 * stored random vector. It overwrites the hidden data with the
6437 * unhidden AVP subformat.
6439 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
6445 uint16_t m
= htons(type
);
6447 // Compute initial pad
6449 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
6450 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6451 MD5_Update(&ctx
, vector
, vec_len
);
6452 MD5_Final(digest
, &ctx
);
6454 // pointer to last decoded 16 octets
6459 // calculate a new pad based on the last decoded block
6460 if (d
>= sizeof(digest
))
6463 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6464 MD5_Update(&ctx
, last
, sizeof(digest
));
6465 MD5_Final(digest
, &ctx
);
6471 *value
++ ^= digest
[d
++];
6476 int find_filter(char const *name
, size_t len
)
6481 for (i
= 0; i
< MAXFILTER
; i
++)
6483 if (!*ip_filters
[i
].name
)
6491 if (strlen(ip_filters
[i
].name
) != len
)
6494 if (!strncmp(ip_filters
[i
].name
, name
, len
))
6501 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
6505 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
6506 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
6507 case FILTER_PORT_OP_GT
: return port
> p
->port
;
6508 case FILTER_PORT_OP_LT
: return port
< p
->port
;
6509 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
6515 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
6519 case FILTER_FLAG_OP_ANY
:
6520 return (flags
& sflags
) || (~flags
& cflags
);
6522 case FILTER_FLAG_OP_ALL
:
6523 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
6525 case FILTER_FLAG_OP_EST
:
6526 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
6532 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
6534 uint16_t frag_offset
;
6538 uint16_t src_port
= 0;
6539 uint16_t dst_port
= 0;
6541 ip_filter_rulet
*rule
;
6543 if (len
< 20) // up to end of destination address
6546 if ((*buf
>> 4) != 4) // IPv4
6549 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
6551 src_ip
= *(in_addr_t
*) (buf
+ 12);
6552 dst_ip
= *(in_addr_t
*) (buf
+ 16);
6554 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
6556 int l
= (buf
[0] & 0xf) * 4; // length of IP header
6557 if (len
< l
+ 4) // ports
6560 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
6561 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
6562 if (proto
== IPPROTO_TCP
)
6564 if (len
< l
+ 14) // flags
6567 flags
= buf
[l
+ 13] & 0x3f;
6571 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
6573 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
6576 if (rule
->src_wild
!= INADDR_BROADCAST
&&
6577 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
6580 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
6581 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
6586 // layer 4 deny rules are skipped
6587 if (rule
->action
== FILTER_ACTION_DENY
&&
6588 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
6596 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
6598 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
6601 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
6604 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
6605 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
6612 return rule
->action
== FILTER_ACTION_PERMIT
;
6619 tunnelidt
lac_new_tunnel()
6621 return new_tunnel();
6624 void lac_tunnelclear(tunnelidt t
)
6629 void lac_send_SCCRQ(tunnelidt t
, uint8_t * auth
, unsigned int auth_len
)
6631 uint16_t version
= 0x0100; // protocol version
6633 tunnel
[t
].state
= TUNNELOPENING
;
6635 // Sent SCCRQ - Start Control Connection Request
6636 controlt
*c
= controlnew(1); // sending SCCRQ
6637 controls(c
, 7, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
, 1); // host name
6638 controls(c
, 8, Vendor_name
, 1); // Vendor name
6639 control16(c
, 2, version
, 1); // protocol version
6640 control32(c
, 3, 3, 1); // framing Capabilities
6641 control16(c
, 9, t
, 1); // assigned tunnel
6642 controlb(c
, 11, (uint8_t *) auth
, auth_len
, 1); // CHAP Challenge
6643 LOG(3, 0, t
, "Sent SCCRQ to REMOTE LNS\n");
6644 controladd(c
, 0, t
); // send
6647 void lac_send_ICRQ(tunnelidt t
, sessionidt s
)
6649 // Sent ICRQ Incoming-call-request
6650 controlt
*c
= controlnew(10); // ICRQ
6652 control16(c
, 14, s
, 1); // assigned sesion
6653 call_serial_number
++;
6654 control32(c
, 15, call_serial_number
, 1); // call serial number
6655 LOG(3, s
, t
, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel
[t
].far
);
6656 controladd(c
, 0, t
); // send
6659 void lac_tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
6661 tunnelshutdown(t
, reason
, result
, error
, msg
);