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 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
97 union iphash ip_hash
[256]; // Mapping from IP address to session structures.
101 struct ipv6radix
*branch
;
102 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
105 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
106 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
109 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
110 time_t time_now
= 0; // Current time in seconds since epoch.
111 uint64_t time_now_ms
= 0; // Current time in milliseconds since epoch.
112 static char time_now_string
[64] = {0}; // Current time as a string.
113 static int time_changed
= 0; // time_now changed
114 char main_quit
= 0; // True if we're in the process of exiting.
115 static char main_reload
= 0; // Re-load pending
116 linked_list
*loaded_plugins
;
117 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
119 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
120 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
122 config_descriptt config_values
[] = {
123 CONFIG("debug", debug
, INT
),
124 CONFIG("log_file", log_filename
, STRING
),
125 CONFIG("pid_file", pid_file
, STRING
),
126 CONFIG("random_device", random_device
, STRING
),
127 CONFIG("l2tp_secret", l2tp_secret
, STRING
),
128 CONFIG("l2tp_mtu", l2tp_mtu
, INT
),
129 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
130 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
131 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
132 CONFIG("primary_dns", default_dns1
, IPv4
),
133 CONFIG("secondary_dns", default_dns2
, IPv4
),
134 CONFIG("primary_radius", radiusserver
[0], IPv4
),
135 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
136 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
137 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
138 CONFIG("radius_accounting", radius_accounting
, BOOL
),
139 CONFIG("radius_interim", radius_interim
, INT
),
140 CONFIG("radius_secret", radiussecret
, STRING
),
141 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
142 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
143 CONFIG("radius_bind_min", radius_bind_min
, SHORT
),
144 CONFIG("radius_bind_max", radius_bind_max
, SHORT
),
145 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
146 CONFIG("kill_timedout_sessions", kill_timedout_sessions
, BOOL
),
147 CONFIG("guest_account", guest_user
, STRING
),
148 CONFIG("bind_address", bind_address
, IPv4
),
149 CONFIG("peer_address", peer_address
, IPv4
),
150 CONFIG("send_garp", send_garp
, BOOL
),
151 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
152 CONFIG("throttle_buckets", num_tbfs
, INT
),
153 CONFIG("accounting_dir", accounting_dir
, STRING
),
154 CONFIG("account_all_origin", account_all_origin
, BOOL
),
155 CONFIG("dump_speed", dump_speed
, BOOL
),
156 CONFIG("multi_read_count", multi_read_count
, INT
),
157 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
158 CONFIG("lock_pages", lock_pages
, BOOL
),
159 CONFIG("icmp_rate", icmp_rate
, INT
),
160 CONFIG("packet_limit", max_packets
, INT
),
161 CONFIG("cluster_address", cluster_address
, IPv4
),
162 CONFIG("cluster_interface", cluster_interface
, STRING
),
163 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl
, INT
),
164 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
165 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
166 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
167 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
168 CONFIG("cli_bind_address", cli_bind_address
, IPv4
),
169 CONFIG("hostname", hostname
, STRING
),
171 CONFIG("nexthop_address", nexthop_address
, IPv4
),
172 CONFIG("nexthop6_address", nexthop6_address
, IPv6
),
174 CONFIG("echo_timeout", echo_timeout
, INT
),
175 CONFIG("idle_echo_timeout", idle_echo_timeout
, INT
),
176 CONFIG("iftun_address", iftun_address
, IPv4
),
177 CONFIG("tundevicename", tundevicename
, STRING
),
178 CONFIG("disable_lac_func", disable_lac_func
, BOOL
),
179 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src
, BOOL
),
180 CONFIG("bind_address_remotelns", bind_address_remotelns
, IPv4
),
181 CONFIG("bind_portremotelns", bind_portremotelns
, SHORT
),
182 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind
, STRING
),
183 CONFIG("pppoe_service_name", pppoe_service_name
, STRING
),
184 CONFIG("pppoe_ac_name", pppoe_ac_name
, STRING
),
185 CONFIG("disable_sending_hello", disable_sending_hello
, BOOL
),
186 CONFIG("disable_no_spoof", disable_no_spoof
, BOOL
),
187 CONFIG("bind_multi_address", bind_multi_address
, STRING
),
188 CONFIG("grp_txrate_average_time", grp_txrate_average_time
, INT
),
189 CONFIG("pppoe_only_equal_svc_name", pppoe_only_equal_svc_name
, BOOL
),
190 CONFIG("multi_hostname", multi_hostname
, STRING
),
191 CONFIG("no_throttle_local_IP", no_throttle_local_IP
, BOOL
),
192 CONFIG("dhcp6_preferred_lifetime", dhcp6_preferred_lifetime
, INT
),
193 CONFIG("dhcp6_valid_lifetime", dhcp6_valid_lifetime
, INT
),
194 CONFIG("dhcp6_server_duid", dhcp6_server_duid
, INT
),
195 CONFIG("primary_ipv6_dns", default_ipv6_dns1
, IPv6
),
196 CONFIG("secondary_ipv6_dns", default_ipv6_dns2
, IPv6
),
197 CONFIG("default_ipv6_domain_list", default_ipv6_domain_list
, STRING
),
201 static char *plugin_functions
[] = {
206 "plugin_new_session",
207 "plugin_kill_session",
209 "plugin_radius_response",
210 "plugin_radius_reset",
211 "plugin_radius_account",
212 "plugin_become_master",
213 "plugin_new_session_master",
216 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
218 // Counters for shutdown sessions
219 static sessiont shut_acct
[8192];
220 static sessionidt shut_acct_n
= 0;
222 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
223 bundlet
*bundle
= NULL
; // Array of bundle structures.
224 fragmentationt
*frag
= NULL
; // Array of fragmentation structures.
225 sessiont
*session
= NULL
; // Array of session structures.
226 groupsesst
*grpsession
= NULL
; // Array of groupsesst structures.
227 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
228 radiust
*radius
= NULL
; // Array of radius structures.
229 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
230 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
231 static controlt
*controlfree
= 0;
232 struct Tstats
*_statistics
= NULL
;
234 struct Tringbuffer
*ringbuffer
= NULL
;
237 static void uncache_ipmap(in_addr_t ip
);
238 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
);
239 static void free_ip_address(sessionidt s
);
240 static void dump_acct_info(int all
);
241 static void sighup_handler(int sig
);
242 static void shutdown_handler(int sig
);
243 static void sigchild_handler(int sig
);
244 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
245 static void update_config(void);
246 static void read_config_file(void);
247 static void initplugins(void);
248 static int add_plugin(char *plugin_name
);
249 static int remove_plugin(char *plugin_name
);
250 static void plugins_done(void);
251 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
);
252 static tunnelidt
new_tunnel(void);
253 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
254 static void bundleclear(bundleidt b
);
256 // return internal time (10ths since process startup), set f if given
257 // as a side-effect sets time_now, and time_changed
258 static clockt
now(double *f
)
262 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
263 if (t
.tv_sec
!= time_now
)
270 // Time in milliseconds
271 // TODO FOR MLPPP DEV
272 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
274 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
277 // work out a retry time based on try number
278 // This is a straight bounded exponential backoff.
279 // Maximum re-try time is 32 seconds. (2^5).
280 clockt
backoff(uint8_t try)
282 if (try > 5) try = 5; // max backoff
283 return now(NULL
) + 10 * (1 << try);
288 // Log a debug message. Typically called via the LOG macro
290 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
292 static char message
[65536] = {0};
298 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
299 ringbuffer
->tail
= 0;
300 if (ringbuffer
->tail
== ringbuffer
->head
)
301 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
302 ringbuffer
->head
= 0;
304 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
305 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
306 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
307 va_start(ap
, format
);
308 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, MAX_LOG_LENGTH
, format
, ap
);
313 if (config
->debug
< level
) return;
315 va_start(ap
, format
);
316 vsnprintf(message
, sizeof(message
), format
, ap
);
319 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
321 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
326 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
329 const uint8_t *d
= data
;
331 if (config
->debug
< level
) return;
333 // No support for _log_hex to syslog
336 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
337 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
339 for (i
= 0; i
< maxsize
; )
341 fprintf(log_stream
, "%4X: ", i
);
342 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
344 fprintf(log_stream
, "%02X ", d
[j
]);
346 fputs(": ", log_stream
);
349 for (; j
< i
+ 16; j
++)
351 fputs(" ", log_stream
);
353 fputs(": ", log_stream
);
356 fputs(" ", log_stream
);
357 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
359 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
360 fputc(d
[j
], log_stream
);
362 fputc('.', log_stream
);
365 fputs(" ", log_stream
);
369 fputs("\n", log_stream
);
373 setbuf(log_stream
, NULL
);
377 // update a counter, accumulating 2^32 wraps
378 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
380 uint32_t new = *counter
+ delta
;
387 // initialise the random generator
388 static void initrandom(char *source
)
390 static char path
[sizeof(config
->random_device
)] = "*undefined*";
392 // reinitialise only if we are forced to do so or if the config has changed
393 if (source
&& !strncmp(path
, source
, sizeof(path
)))
396 // close previous source, if any
405 snprintf(path
, sizeof(path
), "%s", source
);
409 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
411 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
412 path
, strerror(errno
));
417 // fill buffer with random data
418 void random_data(uint8_t *buf
, int len
)
425 n
= read(rand_fd
, buf
, len
);
426 if (n
>= len
) return;
431 LOG(0, 0, 0, "Error reading from random source: %s\n",
434 // fall back to rand()
442 // append missing data
444 // not using the low order bits from the prng stream
445 buf
[n
++] = (rand() >> 4) & 0xff;
450 // This adds it to the routing table, advertises it
451 // via BGP if enabled, and stuffs it into the
452 // 'sessionbyip' cache.
454 // 'ip' must be in _host_ order.
456 static void routeset(sessionidt s
, in_addr_t ip
, int prefixlen
, in_addr_t gw
, int add
)
466 if (!prefixlen
) prefixlen
= 32;
468 ip
&= 0xffffffff << (32 - prefixlen
);; // Force the ip to be the first one in the route.
470 memset(&req
, 0, sizeof(req
));
474 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
475 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
479 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
480 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
483 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
485 req
.rt
.rtm_family
= AF_INET
;
486 req
.rt
.rtm_dst_len
= prefixlen
;
487 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
488 req
.rt
.rtm_protocol
= 42;
489 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
490 req
.rt
.rtm_type
= RTN_UNICAST
;
492 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
494 netlink_addattr(&req
.nh
, RTA_DST
, &n_ip
, sizeof(n_ip
));
498 netlink_addattr(&req
.nh
, RTA_GATEWAY
, &n_ip
, sizeof(n_ip
));
501 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d%s%s\n", add
? "add" : "del",
502 fmtaddr(htonl(ip
), 0), prefixlen
,
503 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
505 if (netlink_send(&req
.nh
) < 0)
506 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno
));
510 bgp_add_route(htonl(ip
), prefixlen
);
512 bgp_del_route(htonl(ip
), prefixlen
);
515 // Add/Remove the IPs to the 'sessionbyip' cache.
516 // Note that we add the zero address in the case of
517 // a network route. Roll on CIDR.
519 // Note that 's == 0' implies this is the address pool.
520 // We still cache it here, because it will pre-fill
521 // the malloc'ed tree.
525 if (!add
) // Are we deleting a route?
526 s
= 0; // Caching the session as '0' is the same as uncaching.
528 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
533 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
541 char ipv6addr
[INET6_ADDRSTRLEN
];
543 if (!config
->ipv6_prefix
.s6_addr
[0])
545 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
549 memset(&req
, 0, sizeof(req
));
553 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
554 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
558 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
559 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
562 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
564 req
.rt
.rtm_family
= AF_INET6
;
565 req
.rt
.rtm_dst_len
= prefixlen
;
566 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
567 req
.rt
.rtm_protocol
= 42;
568 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
569 req
.rt
.rtm_type
= RTN_UNICAST
;
571 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
572 netlink_addattr(&req
.nh
, RTA_DST
, &ip
, sizeof(ip
));
574 netlink_addattr(&req
.nh
, RTA_METRICS
, &metric
, sizeof(metric
));
576 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d\n",
578 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
581 if (netlink_send(&req
.nh
) < 0)
582 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno
));
586 bgp_add_route6(ip
, prefixlen
);
588 bgp_del_route6(ip
, prefixlen
);
593 if (!add
) // Are we deleting a route?
594 s
= 0; // Caching the session as '0' is the same as uncaching.
596 cache_ipv6map(ip
, prefixlen
, s
);
603 // Set up netlink socket
604 static void initnetlink(void)
606 struct sockaddr_nl nladdr
;
608 nlfd
= socket(AF_NETLINK
, SOCK_RAW
, NETLINK_ROUTE
);
611 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno
));
615 memset(&nladdr
, 0, sizeof(nladdr
));
616 nladdr
.nl_family
= AF_NETLINK
;
617 nladdr
.nl_pid
= getpid();
619 if (bind(nlfd
, (struct sockaddr
*)&nladdr
, sizeof(nladdr
)) < 0)
621 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno
));
626 ssize_t
netlink_send(struct nlmsghdr
*nh
)
628 struct sockaddr_nl nladdr
;
632 nh
->nlmsg_pid
= getpid();
633 nh
->nlmsg_seq
= ++nlseqnum
;
635 // set kernel address
636 memset(&nladdr
, 0, sizeof(nladdr
));
637 nladdr
.nl_family
= AF_NETLINK
;
639 iov
= (struct iovec
){ (void *)nh
, nh
->nlmsg_len
};
640 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
642 return sendmsg(nlfd
, &msg
, 0);
645 static ssize_t
netlink_recv(void *buf
, ssize_t len
)
647 struct sockaddr_nl nladdr
;
651 // set kernel address
652 memset(&nladdr
, 0, sizeof(nladdr
));
653 nladdr
.nl_family
= AF_NETLINK
;
655 iov
= (struct iovec
){ buf
, len
};
656 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
658 return recvmsg(nlfd
, &msg
, 0);
661 /* adapted from iproute2 */
662 void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
)
664 int len
= RTA_LENGTH(alen
);
667 rta
= (struct rtattr
*)(((void *)nh
) + NLMSG_ALIGN(nh
->nlmsg_len
));
668 rta
->rta_type
= type
;
670 memcpy(RTA_DATA(rta
), data
, alen
);
671 nh
->nlmsg_len
= NLMSG_ALIGN(nh
->nlmsg_len
) + RTA_ALIGN(len
);
674 // messages corresponding to different phases seq number
675 static char *tun_nl_phase_msg
[] = {
677 "getting tun interface index",
678 "setting tun interface parameters",
679 "setting tun IPv4 address",
680 "setting tun LL IPv6 address",
681 "setting tun global IPv6 address",
685 // Set up TUN interface
686 static void inittun(void)
690 memset(&ifr
, 0, sizeof(ifr
));
691 ifr
.ifr_flags
= IFF_TUN
;
693 tunfd
= open(TUNDEVICE
, O_RDWR
);
696 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
700 int flags
= fcntl(tunfd
, F_GETFL
, 0);
701 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
704 if (*config
->tundevicename
)
705 strncpy(ifr
.ifr_name
, config
->tundevicename
, IFNAMSIZ
);
707 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
709 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
712 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevicename
) - 1);
713 strncpy(config
->tundevicename
, ifr
.ifr_name
, sizeof(config
->tundevicename
));
715 tunidx
= if_nametoindex(config
->tundevicename
);
718 LOG(0, 0, 0, "Can't get tun interface index\n");
727 struct ifinfomsg ifinfo
;
728 struct ifaddrmsg ifaddr
;
730 char rtdata
[32]; // 32 should be enough
732 uint32_t txqlen
, mtu
;
735 memset(&req
, 0, sizeof(req
));
737 req
.nh
.nlmsg_type
= RTM_NEWLINK
;
738 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_MULTI
;
739 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifinfo
));
741 req
.ifmsg
.ifinfo
.ifi_family
= AF_UNSPEC
;
742 req
.ifmsg
.ifinfo
.ifi_index
= tunidx
;
743 req
.ifmsg
.ifinfo
.ifi_flags
|= IFF_UP
; // set interface up
744 req
.ifmsg
.ifinfo
.ifi_change
= IFF_UP
; // only change this flag
746 /* Bump up the qlen to deal with bursts from the network */
748 netlink_addattr(&req
.nh
, IFLA_TXQLEN
, &txqlen
, sizeof(txqlen
));
749 /* set MTU to modem MRU */
751 netlink_addattr(&req
.nh
, IFLA_MTU
, &mtu
, sizeof(mtu
));
753 if (netlink_send(&req
.nh
) < 0)
756 memset(&req
, 0, sizeof(req
));
758 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
759 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
760 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
762 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET
;
763 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 32;
764 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
765 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
767 if (config
->nbmultiaddress
> 1)
770 for (i
= 0; i
< config
->nbmultiaddress
; i
++)
772 ip
= config
->iftun_n_address
[i
];
773 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
774 if (netlink_send(&req
.nh
) < 0)
780 if (config
->iftun_address
)
781 ip
= config
->iftun_address
;
783 ip
= 0x01010101; // 1.1.1.1
784 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
786 if (netlink_send(&req
.nh
) < 0)
792 // Only setup IPv6 on the tun device if we have a configured prefix
793 if (config
->ipv6_prefix
.s6_addr
[0]) {
796 memset(&req
, 0, sizeof(req
));
798 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
799 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
800 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
802 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
803 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
804 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_LINK
;
805 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
807 // Link local address is FE80::1
808 memset(&ip6
, 0, sizeof(ip6
));
809 ip6
.s6_addr
[0] = 0xFE;
810 ip6
.s6_addr
[1] = 0x80;
812 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
814 if (netlink_send(&req
.nh
) < 0)
817 memset(&req
, 0, sizeof(req
));
819 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
820 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
821 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
823 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
824 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
825 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
826 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
828 // Global address is prefix::1
829 ip6
= config
->ipv6_prefix
;
831 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
833 if (netlink_send(&req
.nh
) < 0)
837 memset(&req
, 0, sizeof(req
));
839 req
.nh
.nlmsg_type
= NLMSG_DONE
;
840 req
.nh
.nlmsg_len
= NLMSG_LENGTH(0);
842 if (netlink_send(&req
.nh
) < 0)
845 // if we get an error for seqnum < min_initok_nlseqnum,
846 // we must exit as initialization went wrong
847 if (config
->ipv6_prefix
.s6_addr
[0])
848 min_initok_nlseqnum
= 5 + 1; // idx + if + addr + 2*addr6
850 min_initok_nlseqnum
= 3 + 1; // idx + if + addr
856 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno
));
860 // set up LAC UDP ports
861 static void initlacudp(void)
864 struct sockaddr_in addr
;
866 // Tunnel to Remote LNS
867 memset(&addr
, 0, sizeof(addr
));
868 addr
.sin_family
= AF_INET
;
869 addr
.sin_port
= htons(config
->bind_portremotelns
);
870 addr
.sin_addr
.s_addr
= config
->bind_address_remotelns
;
871 udplacfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
872 setsockopt(udplacfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
874 int flags
= fcntl(udplacfd
, F_GETFL
, 0);
875 fcntl(udplacfd
, F_SETFL
, flags
| O_NONBLOCK
);
877 if (bind(udplacfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
879 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno
));
884 // set up control ports
885 static void initcontrol(void)
888 struct sockaddr_in addr
;
891 memset(&addr
, 0, sizeof(addr
));
892 addr
.sin_family
= AF_INET
;
893 addr
.sin_port
= htons(NSCTL_PORT
);
894 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
895 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
896 setsockopt(controlfd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
897 if (bind(controlfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
899 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
904 // set up Dynamic Authorization Extensions to RADIUS port
905 static void initdae(void)
908 struct sockaddr_in addr
;
910 // Dynamic Authorization Extensions to RADIUS
911 memset(&addr
, 0, sizeof(addr
));
912 addr
.sin_family
= AF_INET
;
913 addr
.sin_port
= htons(config
->radius_dae_port
);
914 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
915 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
916 setsockopt(daefd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
917 if (bind(daefd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
919 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
925 static void initudp(int * pudpfd
, in_addr_t ip_bind
)
928 struct sockaddr_in addr
;
931 memset(&addr
, 0, sizeof(addr
));
932 addr
.sin_family
= AF_INET
;
933 addr
.sin_port
= htons(L2TPPORT
);
934 addr
.sin_addr
.s_addr
= ip_bind
;
935 (*pudpfd
) = socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
936 setsockopt((*pudpfd
), SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
938 int flags
= fcntl((*pudpfd
), F_GETFL
, 0);
939 fcntl((*pudpfd
), F_SETFL
, flags
| O_NONBLOCK
);
941 if (bind((*pudpfd
), (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
943 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
949 // Find session by IP, < 1 for not found
951 // Confusingly enough, this 'ip' must be
952 // in _network_ order. This being the common
953 // case when looking it up from IP packet headers.
955 // We actually use this cache for two things.
956 // #1. For used IP addresses, this maps to the
957 // session ID that it's used by.
958 // #2. For un-used IP addresses, this maps to the
959 // index into the pool table that contains that
963 static sessionidt
lookup_ipmap(in_addr_t ip
)
965 uint8_t *a
= (uint8_t *) &ip
;
966 union iphash
*h
= ip_hash
;
968 if (!(h
= h
[*a
++].idx
)) return 0;
969 if (!(h
= h
[*a
++].idx
)) return 0;
970 if (!(h
= h
[*a
++].idx
)) return 0;
975 static sessionidt
lookup_ipv6map(struct in6_addr ip
)
977 struct ipv6radix
*curnode
;
980 char ipv6addr
[INET6_ADDRSTRLEN
];
982 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
986 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
988 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
993 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
994 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1001 sessionidt
sessionbyip(in_addr_t ip
)
1003 sessionidt s
= lookup_ipmap(ip
);
1006 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
1012 sessionidt
sessionbyipv6(struct in6_addr ip
)
1015 CSTAT(sessionbyipv6
);
1017 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
1018 (ip
.s6_addr
[0] == 0xFE &&
1019 ip
.s6_addr
[1] == 0x80 &&
1020 ip
.s6_addr16
[1] == 0 &&
1021 ip
.s6_addr16
[2] == 0 &&
1022 ip
.s6_addr16
[3] == 0))
1024 in_addr_t
*pipv4
= (in_addr_t
*) &ip
.s6_addr
[8];
1025 s
= lookup_ipmap(*pipv4
);
1027 s
= lookup_ipv6map(ip
);
1030 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
1037 // Take an IP address in HOST byte order and
1038 // add it to the sessionid by IP cache.
1040 // (It's actually cached in network order)
1042 void cache_ipmap(in_addr_t ip
, sessionidt s
)
1044 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1045 uint8_t *a
= (uint8_t *) &nip
;
1046 union iphash
*h
= ip_hash
;
1049 for (i
= 0; i
< 3; i
++)
1051 if (!(h
[a
[i
]].idx
|| (h
[a
[i
]].idx
= calloc(256, sizeof(union iphash
)))))
1060 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
1063 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
1064 // else a map to an ip pool index.
1067 static void uncache_ipmap(in_addr_t ip
)
1069 cache_ipmap(ip
, 0); // Assign it to the NULL session.
1072 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
)
1076 struct ipv6radix
*curnode
;
1077 char ipv6addr
[INET6_ADDRSTRLEN
];
1079 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
1081 bytes
= prefixlen
>> 3;
1084 if (curnode
->branch
== NULL
)
1086 if (!(curnode
->branch
= calloc(256,
1087 sizeof (struct ipv6radix
))))
1090 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
1097 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
1098 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1102 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1103 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1109 // CLI list to dump current ipcache.
1111 int cmd_show_ipcache(struct cli_def
*cli
, const char *command
, char **argv
, int argc
)
1113 union iphash
*d
= ip_hash
, *e
, *f
, *g
;
1117 if (CLI_HELP_REQUESTED
)
1118 return CLI_HELP_NO_ARGS
;
1120 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
1122 for (i
= 0; i
< 256; ++i
)
1128 for (j
= 0; j
< 256; ++j
)
1134 for (k
= 0; k
< 256; ++k
)
1140 for (l
= 0; l
< 256; ++l
)
1145 cli_print(cli
, "%7d %d.%d.%d.%d", g
[l
].sess
, i
, j
, k
, l
);
1151 cli_print(cli
, "%d entries in cache", count
);
1156 // Find session by username, 0 for not found
1157 // walled garden users aren't authenticated, so the username is
1158 // reasonably useless. Ignore them to avoid incorrect actions
1160 // This is VERY inefficent. Don't call it often. :)
1162 sessionidt
sessionbyuser(char *username
)
1165 CSTAT(sessionbyuser
);
1167 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1169 if (!session
[s
].opened
)
1172 if (session
[s
].walled_garden
)
1173 continue; // Skip walled garden users.
1175 if (!strncmp(session
[s
].user
, username
, 128))
1179 return 0; // Not found.
1182 void send_garp(in_addr_t ip
)
1188 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
1191 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
1194 memset(&ifr
, 0, sizeof(ifr
));
1195 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
1196 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
1198 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
1202 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
1203 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
1205 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
1210 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
1213 static sessiont
*sessiontbysessionidt(sessionidt s
)
1215 if (!s
|| s
>= MAXSESSION
) return NULL
;
1219 static sessionidt
sessionidtbysessiont(sessiont
*s
)
1221 sessionidt val
= s
-session
;
1222 if (s
< session
|| val
>= MAXSESSION
) return 0;
1226 // actually send a control message for a specific tunnel
1227 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
1229 struct sockaddr_in addr
;
1235 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
1236 STAT(tunnel_tx_errors
);
1240 if (t
== TUNNEL_ID_PPPOE
)
1242 pppoe_sess_send(buf
, l
, t
);
1248 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1249 STAT(tunnel_tx_errors
);
1253 memset(&addr
, 0, sizeof(addr
));
1254 addr
.sin_family
= AF_INET
;
1255 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
1256 addr
.sin_port
= htons(tunnel
[t
].port
);
1258 // sequence expected, if sequence in message
1259 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
1261 // If this is a control message, deal with retries
1264 tunnel
[t
].last
= time_now
; // control message sent
1265 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
1268 STAT(tunnel_retries
);
1269 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
1273 if (sendto(udpfd
[tunnel
[t
].indexudp
], buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1275 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1276 strerror(errno
), udpfd
[tunnel
[t
].indexudp
], buf
, l
, inet_ntoa(addr
.sin_addr
));
1277 STAT(tunnel_tx_errors
);
1281 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
1282 STAT(tunnel_tx_packets
);
1283 INC_STAT(tunnel_tx_bytes
, l
);
1287 // Tiny helper function to write data to
1288 // the 'tun' device.
1290 int tun_write(uint8_t * data
, int size
)
1292 return write(tunfd
, data
, size
);
1295 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1296 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1298 int d
= (tcp
[12] >> 4) * 4;
1305 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1308 if (tcp
+ d
> buf
+ len
) // short?
1316 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1319 if (mss
+ 2 > data
) return; // short?
1323 if (*opts
== 0) return; // end of options
1324 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1327 opts
+= opts
[1]; // skip over option
1330 if (!mss
) return; // not found
1331 orig
= ntohs(*(uint16_t *) mss
);
1333 if (orig
<= MSS
) return; // mss OK
1335 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1336 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1337 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1338 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1341 *(int16_t *) mss
= htons(MSS
);
1343 // adjust checksum (see rfc1141)
1344 sum
= orig
+ (~MSS
& 0xffff);
1345 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1346 sum
= (sum
& 0xffff) + (sum
>> 16);
1347 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1350 void processmpframe(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint8_t extra
)
1354 // Skip the four extra bytes
1366 proto
= ntohs(*(uint16_t *) p
);
1374 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1375 return; // closing session, PPP not processed
1377 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1378 processipin(s
, t
, p
, l
);
1380 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
1384 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1385 return; // closing session, PPP not processed
1388 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1389 processipv6in(s
, t
, p
, l
);
1391 else if (proto
== PPPIPCP
)
1393 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1394 processipcp(s
, t
, p
, l
);
1396 else if (proto
== PPPCCP
)
1398 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1399 processccp(s
, t
, p
, l
);
1403 LOG(2, s
, t
, "MPPP: Unsupported MP protocol 0x%04X received\n",proto
);
1407 static void update_session_out_stat(sessionidt s
, sessiont
*sp
, int len
)
1409 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1410 sp
->cout_delta
+= len
;
1412 sp
->last_data
= time_now
;
1414 sess_local
[s
].cout
+= len
; // To send to master..
1415 sess_local
[s
].pout
++;
1418 // process outgoing (to tunnel) IP
1420 // (i.e. this routine writes to data[-8]).
1421 void processipout(uint8_t *buf
, int len
)
1427 in_addr_t ip
, ip_src
;
1429 uint8_t *data
= buf
; // Keep a copy of the originals.
1432 uint8_t fragbuf
[MAXETHER
+ 20];
1434 CSTAT(processipout
);
1436 if (len
< MIN_IP_SIZE
)
1438 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1439 STAT(tun_rx_errors
);
1442 if (len
>= MAXETHER
)
1444 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1445 STAT(tun_rx_errors
);
1449 // Skip the tun header
1453 // Got an IP header now
1454 if (*(uint8_t *)(buf
) >> 4 != 4)
1456 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1460 ip_src
= *(uint32_t *)(buf
+ 12);
1461 ip
= *(uint32_t *)(buf
+ 16);
1462 if ((g
= grp_groupbyip(ip
)))
1464 s
= grp_getnextsession(g
, ip
, ip_src
);
1467 // Is this a packet for a session that doesn't exist?
1468 static int rate
= 0; // Number of ICMP packets we've sent this second.
1469 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1471 if (last
!= time_now
)
1477 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1479 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1480 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1481 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1486 else if (!(s
= sessionbyip(ip
)))
1488 // Is this a packet for a session that doesn't exist?
1489 static int rate
= 0; // Number of ICMP packets we've sent this second.
1490 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1492 if (last
!= time_now
)
1498 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1500 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1501 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1502 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1507 t
= session
[s
].tunnel
;
1508 if (len
> session
[s
].mru
|| (session
[s
].mrru
&& len
> session
[s
].mrru
))
1510 LOG(3, s
, t
, "Packet size more than session MRU\n");
1516 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1517 if (config
->max_packets
> 0)
1519 if (sess_local
[s
].last_packet_out
== TIME
)
1521 int max
= config
->max_packets
;
1523 // All packets for throttled sessions are handled by the
1524 // master, so further limit by using the throttle rate.
1525 // A bit of a kludge, since throttle rate is in kbps,
1526 // but should still be generous given our average DSL
1527 // packet size is 200 bytes: a limit of 28kbps equates
1528 // to around 180 packets per second.
1529 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1530 max
= sp
->throttle_out
;
1532 if (++sess_local
[s
].packets_out
> max
)
1534 sess_local
[s
].packets_dropped
++;
1540 if (sess_local
[s
].packets_dropped
)
1542 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1543 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1544 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1545 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1549 sess_local
[s
].last_packet_out
= TIME
;
1550 sess_local
[s
].packets_out
= 1;
1551 sess_local
[s
].packets_dropped
= 0;
1555 // run access-list if any
1556 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1559 // adjust MSS on SYN and SYN,ACK packets with options
1560 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1562 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1563 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1564 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1569 if (!config
->no_throttle_local_IP
|| !sessionbyip(ip_src
))
1571 // Are we throttling this session?
1572 if (config
->cluster_iam_master
)
1573 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1575 master_throttle_packet(sp
->tbf_out
, data
, size
);
1580 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1582 // We are walled-gardening this
1583 master_garden_packet(s
, data
, size
);
1587 if(session
[s
].bundle
!= 0 && bundle
[session
[s
].bundle
].num_of_links
> 1)
1590 if (!config
->cluster_iam_master
)
1592 // The MPPP packets must be managed by the Master.
1593 master_forward_mppp_packet(s
, data
, size
);
1597 // Add on L2TP header
1598 sessionidt members
[MAXBUNDLESES
];
1599 bundleidt bid
= session
[s
].bundle
;
1600 bundlet
*b
= &bundle
[bid
];
1601 uint32_t num_of_links
, nb_opened
;
1604 num_of_links
= b
->num_of_links
;
1606 for (i
= 0;i
< num_of_links
;i
++)
1609 if (session
[s
].ppp
.lcp
== Opened
)
1611 members
[nb_opened
] = s
;
1618 LOG(3, s
, t
, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid
);
1622 num_of_links
= nb_opened
;
1623 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1624 s
= members
[b
->current_ses
];
1625 t
= session
[s
].tunnel
;
1627 LOG(4, s
, t
, "MPPP: (1)Session number becomes: %d\n", s
);
1629 if (num_of_links
> 1)
1631 if(len
> MINFRAGLEN
)
1633 //for rotate traffic among the member links
1634 uint32_t divisor
= num_of_links
;
1636 divisor
= divisor
/2 + (divisor
& 1);
1638 // Partition the packet to "num_of_links" fragments
1639 uint32_t fraglen
= len
/ divisor
;
1640 uint32_t last_fraglen
= fraglen
+ len
% divisor
;
1641 uint32_t remain
= len
;
1643 // send the first packet
1644 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, fraglen
, s
, t
, PPPIP
, 0, bid
, MP_BEGIN
);
1646 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1649 update_session_out_stat(s
, sp
, fraglen
);
1652 while (remain
> last_fraglen
)
1654 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1655 s
= members
[b
->current_ses
];
1656 t
= session
[s
].tunnel
;
1658 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1659 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), fraglen
, s
, t
, PPPIP
, 0, bid
, 0);
1661 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1662 update_session_out_stat(s
, sp
, fraglen
);
1665 // send the last fragment
1666 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1667 s
= members
[b
->current_ses
];
1668 t
= session
[s
].tunnel
;
1670 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1671 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), remain
, s
, t
, PPPIP
, 0, bid
, MP_END
);
1673 tunnelsend(fragbuf
, remain
+ (p
-fragbuf
), t
); // send it...
1674 update_session_out_stat(s
, sp
, remain
);
1675 if (remain
!= last_fraglen
)
1676 LOG(3, s
, t
, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain
, last_fraglen
);
1680 // Send it as one frame
1681 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, bid
, MP_BOTH_BITS
);
1683 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1684 LOG(4, s
, t
, "MPPP: packet sent as one frame\n");
1685 update_session_out_stat(s
, sp
, len
);
1690 // Send it as one frame (NO MPPP Frame)
1691 uint8_t *p
= opt_makeppp(buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1692 tunnelsend(p
, len
+ (buf
-p
), t
); // send it...
1693 update_session_out_stat(s
, sp
, len
);
1698 uint8_t *p
= opt_makeppp(buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1699 tunnelsend(p
, len
+ (buf
-p
), t
); // send it...
1700 update_session_out_stat(s
, sp
, len
);
1703 // Snooping this session, send it to intercept box
1704 if (sp
->snoop_ip
&& sp
->snoop_port
)
1705 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1710 // process outgoing (to tunnel) IPv6
1712 static void processipv6out(uint8_t * buf
, int len
)
1718 struct in6_addr ip6
;
1720 uint8_t *data
= buf
; // Keep a copy of the originals.
1723 uint8_t b
[MAXETHER
+ 20];
1725 CSTAT(processipv6out
);
1727 if (len
< MIN_IP_SIZE
)
1729 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1730 STAT(tunnel_tx_errors
);
1733 if (len
>= MAXETHER
)
1735 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1736 STAT(tunnel_tx_errors
);
1740 // Skip the tun header
1744 // Got an IP header now
1745 if (*(uint8_t *)(buf
) >> 4 != 6)
1747 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1751 ip6
= *(struct in6_addr
*)(buf
+24);
1752 s
= sessionbyipv6(ip6
);
1756 ip
= *(uint32_t *)(buf
+ 32);
1757 s
= sessionbyip(ip
);
1762 // Is this a packet for a session that doesn't exist?
1763 static int rate
= 0; // Number of ICMP packets we've sent this second.
1764 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1766 if (last
!= time_now
)
1772 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1774 // FIXME: Should send icmp6 host unreachable
1778 if (session
[s
].bundle
&& bundle
[session
[s
].bundle
].num_of_links
> 1)
1780 bundleidt bid
= session
[s
].bundle
;
1781 bundlet
*b
= &bundle
[bid
];
1783 b
->current_ses
= (b
->current_ses
+ 1) % b
->num_of_links
;
1784 s
= b
->members
[b
->current_ses
];
1785 LOG(3, s
, session
[s
].tunnel
, "MPPP: Session number becomes: %u\n", s
);
1787 t
= session
[s
].tunnel
;
1789 sp
->last_data
= time_now
;
1791 // FIXME: add DoS prevention/filters?
1795 // Are we throttling this session?
1796 if (config
->cluster_iam_master
)
1797 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1799 master_throttle_packet(sp
->tbf_out
, data
, size
);
1802 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1804 // We are walled-gardening this
1805 master_garden_packet(s
, data
, size
);
1809 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1811 // Add on L2TP header
1813 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0);
1815 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1818 // Snooping this session, send it to intercept box
1819 if (sp
->snoop_ip
&& sp
->snoop_port
)
1820 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1822 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1823 sp
->cout_delta
+= len
;
1827 sess_local
[s
].cout
+= len
; // To send to master..
1828 sess_local
[s
].pout
++;
1832 // Helper routine for the TBF filters.
1833 // Used to send queued data in to the user!
1835 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1840 uint8_t *data
= buf
; // Keep a copy of the originals.
1842 uint8_t b
[MAXETHER
+ 20];
1844 if (len
< 0 || len
> MAXETHER
)
1846 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1850 // Skip the tun header
1857 t
= session
[s
].tunnel
;
1860 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1862 // Add on L2TP header
1863 if (*(uint16_t *) (data
+ 2) == htons(PKTIPV6
))
1864 p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0); // IPV6
1866 p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0); // IPV4
1870 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1872 // Snooping this session.
1873 if (sp
->snoop_ip
&& sp
->snoop_port
)
1874 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1876 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1877 sp
->cout_delta
+= len
;
1881 sess_local
[s
].cout
+= len
; // To send to master..
1882 sess_local
[s
].pout
++;
1885 // add an AVP (16 bit)
1886 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1888 uint16_t l
= (m
? 0x8008 : 0x0008);
1889 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1890 pint16
[0] = htons(l
);
1891 pint16
[1] = htons(0);
1892 pint16
[2] = htons(avp
);
1893 pint16
[3] = htons(val
);
1897 // add an AVP (32 bit)
1898 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1900 uint16_t l
= (m
? 0x800A : 0x000A);
1901 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1902 uint32_t *pint32
= (uint32_t *) (c
->buf
+ c
->length
+ 6);
1903 pint16
[0] = htons(l
);
1904 pint16
[1] = htons(0);
1905 pint16
[2] = htons(avp
);
1906 pint32
[0] = htonl(val
);
1910 // add an AVP (string)
1911 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1913 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1914 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1915 pint16
[0] = htons(l
);
1916 pint16
[1] = htons(0);
1917 pint16
[2] = htons(avp
);
1918 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1919 c
->length
+= 6 + strlen(val
);
1923 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1925 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1926 uint16_t *pint16
= (uint16_t *) (c
->buf
+ c
->length
+ 0);
1927 pint16
[0] = htons(l
);
1928 pint16
[1] = htons(0);
1929 pint16
[2] = htons(avp
);
1930 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1931 c
->length
+= 6 + len
;
1934 // new control connection
1935 static controlt
*controlnew(uint16_t mtype
)
1939 c
= malloc(sizeof(controlt
));
1943 controlfree
= c
->next
;
1947 c
->buf
[0] = 0xC8; // flags
1948 c
->buf
[1] = 0x02; // ver
1950 control16(c
, 0, mtype
, 1);
1954 // send zero block if nothing is waiting
1956 static void controlnull(tunnelidt t
)
1959 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1962 buf
[0] = htons(0xC802); // flags/ver
1963 buf
[1] = htons(12); // length
1964 buf
[2] = htons(tunnel
[t
].far
); // tunnel
1965 buf
[3] = htons(0); // session
1966 buf
[4] = htons(tunnel
[t
].ns
); // sequence
1967 buf
[5] = htons(tunnel
[t
].nr
); // sequence
1968 tunnelsend((uint8_t *)buf
, 12, t
);
1971 // add a control message to a tunnel, and send if within window
1972 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1974 uint16_t *pint16
= (uint16_t *) (c
->buf
+ 2);
1975 pint16
[0] = htons(c
->length
); // length
1976 pint16
[1] = htons(tunnel
[t
].far
); // tunnel
1977 pint16
[2] = htons(far
); // session
1978 pint16
[3] = htons(tunnel
[t
].ns
); // sequence
1979 tunnel
[t
].ns
++; // advance sequence
1980 // link in message in to queue
1981 if (tunnel
[t
].controlc
)
1982 tunnel
[t
].controle
->next
= c
;
1984 tunnel
[t
].controls
= c
;
1986 tunnel
[t
].controle
= c
;
1987 tunnel
[t
].controlc
++;
1989 // send now if space in window
1990 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1992 tunnel
[t
].try = 0; // first send
1993 tunnelsend(c
->buf
, c
->length
, t
);
1998 // Throttle or Unthrottle a session
2000 // Throttle the data from/to through a session to no more than
2001 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
2004 // If either value is -1, the current value is retained for that
2007 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
2009 if (!session
[s
].opened
)
2010 return; // No-one home.
2012 if (!*session
[s
].user
)
2013 return; // User not logged in
2017 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
2018 if (session
[s
].tbf_in
)
2019 free_tbf(session
[s
].tbf_in
);
2022 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
2024 session
[s
].tbf_in
= 0;
2026 session
[s
].throttle_in
= rate_in
;
2031 int bytes
= rate_out
* 1024 / 8;
2032 if (session
[s
].tbf_out
)
2033 free_tbf(session
[s
].tbf_out
);
2036 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
2038 session
[s
].tbf_out
= 0;
2040 session
[s
].throttle_out
= rate_out
;
2044 // add/remove filters from session (-1 = no change)
2045 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
2047 if (!session
[s
].opened
)
2048 return; // No-one home.
2050 if (!*session
[s
].user
)
2051 return; // User not logged in
2054 if (filter_in
> MAXFILTER
) filter_in
= -1;
2055 if (filter_out
> MAXFILTER
) filter_out
= -1;
2056 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
2057 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
2061 if (session
[s
].filter_in
)
2062 ip_filters
[session
[s
].filter_in
- 1].used
--;
2065 ip_filters
[filter_in
- 1].used
++;
2067 session
[s
].filter_in
= filter_in
;
2070 if (filter_out
>= 0)
2072 if (session
[s
].filter_out
)
2073 ip_filters
[session
[s
].filter_out
- 1].used
--;
2076 ip_filters
[filter_out
- 1].used
++;
2078 session
[s
].filter_out
= filter_out
;
2082 // start tidy shutdown of session
2083 void sessionshutdown(sessionidt s
, char const *reason
, int cdn_result
, int cdn_error
, int term_cause
)
2085 int walled_garden
= session
[s
].walled_garden
;
2086 bundleidt b
= session
[s
].bundle
;
2087 //delete routes only for last session in bundle (in case of MPPP)
2088 int del_routes
= !b
|| (bundle
[b
].num_of_links
== 1);
2090 CSTAT(sessionshutdown
);
2092 if (!session
[s
].opened
)
2094 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
2095 return; // not a live session
2098 if (!session
[s
].die
)
2100 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
2101 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %u: %s\n", s
, reason
);
2102 run_plugins(PLUGIN_KILL_SESSION
, &data
);
2105 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
2107 // RADIUS Stop message
2108 uint16_t r
= radiusnew(s
);
2111 // stop, if not already trying
2112 if (radius
[r
].state
!= RADIUSSTOP
)
2114 radius
[r
].term_cause
= term_cause
;
2115 radius
[r
].term_msg
= reason
;
2116 radiussend(r
, RADIUSSTOP
);
2120 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
2122 // Save counters to dump to accounting file
2123 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
2124 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
2127 if (!session
[s
].die
)
2128 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
2131 { // IP allocated, clear and unroute
2134 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
2136 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
2137 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
2140 if (del_routes
) routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 0);
2141 session
[s
].route
[r
].ip
= 0;
2144 if (session
[s
].ip_pool_index
== -1) // static ip
2146 if (!routed
&& del_routes
) routeset(s
, session
[s
].ip
, 0, 0, 0);
2152 // unroute IPv6, if setup
2153 if (session
[s
].ipv6route
.s6_addr
[0] && session
[s
].ipv6prefixlen
&& del_routes
)
2154 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
2156 if (session
[s
].ipv6address
.s6_addr
[0] && del_routes
)
2158 route6set(s
, session
[s
].ipv6address
, 128, 0);
2163 // This session was part of a bundle
2164 bundle
[b
].num_of_links
--;
2165 LOG(3, s
, session
[s
].tunnel
, "MPPP: Dropping member link: %d from bundle %d\n",s
,b
);
2166 if(bundle
[b
].num_of_links
== 0)
2169 LOG(3, s
, session
[s
].tunnel
, "MPPP: Kill bundle: %d (No remaing member links)\n",b
);
2173 // Adjust the members array to accomodate the new change
2174 uint8_t mem_num
= 0;
2175 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2176 if(bundle
[b
].members
[bundle
[b
].num_of_links
] != s
)
2179 for(ml
= 0; ml
<bundle
[b
].num_of_links
; ml
++)
2180 if(bundle
[b
].members
[ml
] == s
)
2185 bundle
[b
].members
[mem_num
] = bundle
[b
].members
[bundle
[b
].num_of_links
];
2186 LOG(3, s
, session
[s
].tunnel
, "MPPP: Adjusted member links array\n");
2188 // If the killed session is the first of the bundle,
2189 // the new first session must be stored in the cache_ipmap
2190 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2193 sessionidt new_s
= bundle
[b
].members
[0];
2196 // Add the route for this session.
2197 for (r
= 0; r
< MAXROUTE
&& session
[new_s
].route
[r
].ip
; r
++)
2202 prefixlen
= session
[new_s
].route
[r
].prefixlen
;
2203 ip
= session
[new_s
].route
[r
].ip
;
2205 if (!prefixlen
) prefixlen
= 32;
2206 ip
&= 0xffffffff << (32 - prefixlen
); // Force the ip to be the first one in the route.
2208 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
2209 cache_ipmap(i
, new_s
);
2211 cache_ipmap(session
[new_s
].ip
, new_s
);
2214 if (session
[new_s
].ipv6prefixlen
)
2215 cache_ipv6map(session
[new_s
].ipv6route
, session
[new_s
].ipv6prefixlen
, new_s
);
2217 if (session
[new_s
].ipv6address
.s6_addr
[0])
2219 cache_ipv6map(session
[new_s
].ipv6address
, 128, new_s
);
2225 cluster_send_bundle(b
);
2229 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
2230 throttle_session(s
, 0, 0);
2234 if (session
[s
].tunnel
== TUNNEL_ID_PPPOE
)
2236 pppoe_shutdown_session(s
);
2241 controlt
*c
= controlnew(14); // sending CDN
2245 buf
[0] = htons(cdn_result
);
2246 buf
[1] = htons(cdn_error
);
2247 controlb(c
, 1, (uint8_t *)buf
, 4, 1);
2250 control16(c
, 1, cdn_result
, 1);
2252 control16(c
, 14, s
, 1); // assigned session (our end)
2253 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
2257 // update filter refcounts
2258 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
2259 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
2262 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
2263 sess_local
[s
].lcp
.restart
= 0;
2264 sess_local
[s
].ipcp
.restart
= 0;
2265 sess_local
[s
].ipv6cp
.restart
= 0;
2266 sess_local
[s
].ccp
.restart
= 0;
2268 cluster_send_session(s
);
2271 void sendipcp(sessionidt s
, tunnelidt t
)
2273 uint8_t buf
[MAXETHER
];
2277 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
2279 if (!session
[s
].unique_id
)
2281 if (!++last_id
) ++last_id
; // skip zero
2282 session
[s
].unique_id
= last_id
;
2285 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
, 0, 0, 0);
2289 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
2290 *(uint16_t *) (q
+ 2) = htons(10); // packet length
2291 q
[4] = 3; // ip address option
2292 q
[5] = 6; // option length
2293 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
2294 config
->iftun_n_address
[tunnel
[t
].indexudp
] ? config
->iftun_n_address
[tunnel
[t
].indexudp
] :
2295 my_address
; // send my IP
2297 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
2298 restart_timer(s
, ipcp
);
2301 void sendipv6cp(sessionidt s
, tunnelidt t
)
2303 uint8_t buf
[MAXETHER
];
2307 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
2309 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
, 0, 0, 0);
2313 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
2314 // only send one type
2316 *(uint16_t *) (q
+ 2) = htons(14);
2317 q
[4] = 1; // interface identifier option
2318 q
[5] = 10; // option length
2319 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
2320 *(uint32_t *) (q
+ 10) = 0;
2323 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
2324 restart_timer(s
, ipv6cp
);
2327 static void sessionclear(sessionidt s
)
2329 memset(&session
[s
], 0, sizeof(session
[s
]));
2330 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
2331 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
2333 session
[s
].tunnel
= T_FREE
; // Mark it as free.
2334 session
[s
].next
= sessionfree
;
2338 // kill a session now
2339 void sessionkill(sessionidt s
, char *reason
)
2345 if (!session
[s
].opened
) // not alive
2348 if (session
[s
].next
)
2350 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%u)\n", session
[s
].next
);
2354 if (!session
[s
].die
)
2355 sessionshutdown(s
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
2357 if (sess_local
[s
].radius
)
2358 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
2360 if (session
[s
].forwardtosession
)
2362 sessionidt sess
= session
[s
].forwardtosession
;
2363 if (session
[sess
].forwardtosession
== s
)
2365 // Shutdown the linked session also.
2366 sessionshutdown(sess
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
2370 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
2372 if ((g
= grp_groupbysession(s
)))
2374 grp_removesession(g
, s
);
2378 cluster_send_session(s
);
2381 static void tunnelclear(tunnelidt t
)
2384 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
2385 tunnel
[t
].state
= TUNNELFREE
;
2388 static void bundleclear(bundleidt b
)
2391 memset(&bundle
[b
], 0, sizeof(bundle
[b
]));
2392 bundle
[b
].state
= BUNDLEFREE
;
2395 // kill a tunnel now
2396 static void tunnelkill(tunnelidt t
, char *reason
)
2403 tunnel
[t
].state
= TUNNELDIE
;
2405 // free control messages
2406 while ((c
= tunnel
[t
].controls
))
2408 controlt
* n
= c
->next
;
2409 tunnel
[t
].controls
= n
;
2410 tunnel
[t
].controlc
--;
2411 c
->next
= controlfree
;
2415 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2416 if (session
[s
].tunnel
== t
)
2417 sessionkill(s
, reason
);
2421 LOG(1, 0, t
, "Kill tunnel %u: %s\n", t
, reason
);
2422 cli_tunnel_actions
[t
].action
= 0;
2423 cluster_send_tunnel(t
);
2426 // shut down a tunnel cleanly
2427 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
2431 CSTAT(tunnelshutdown
);
2433 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
2435 // never set up, can immediately kill
2436 tunnelkill(t
, reason
);
2439 LOG(1, 0, t
, "Shutting down tunnel %u (%s)\n", t
, reason
);
2442 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2443 if (session
[s
].tunnel
== t
)
2444 sessionshutdown(s
, reason
, CDN_NONE
, TERM_ADMIN_RESET
);
2446 tunnel
[t
].state
= TUNNELDIE
;
2447 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
2448 cluster_send_tunnel(t
);
2449 // TBA - should we wait for sessions to stop?
2452 controlt
*c
= controlnew(4); // sending StopCCN
2457 buf
[0] = htons(result
);
2458 buf
[1] = htons(error
);
2461 int m
= strlen(msg
);
2462 if (m
+ 4 > sizeof(buf
))
2463 m
= sizeof(buf
) - 4;
2465 memcpy(buf
+2, msg
, m
);
2469 controlb(c
, 1, (uint8_t *)buf
, l
, 1);
2472 control16(c
, 1, result
, 1);
2474 control16(c
, 9, t
, 1); // assigned tunnel (our end)
2475 controladd(c
, 0, t
); // send the message
2479 // read and process packet on tunnel (UDP)
2480 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, uint16_t indexudpfd
)
2482 uint8_t *sendchalresponse
= NULL
;
2483 uint8_t *recvchalresponse
= NULL
;
2484 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
2485 uint8_t *p
= buf
+ 2;
2492 LOG_HEX(5, "UDP Data", buf
, len
);
2493 STAT(tunnel_rx_packets
);
2494 INC_STAT(tunnel_rx_bytes
, len
);
2497 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
2498 STAT(tunnel_rx_errors
);
2501 if ((buf
[1] & 0x0F) != 2)
2503 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf
[1] & 0x0F);
2504 STAT(tunnel_rx_errors
);
2509 l
= ntohs(*(uint16_t *) p
);
2512 t
= ntohs(*(uint16_t *) p
);
2514 s
= ntohs(*(uint16_t *) p
);
2516 if (s
>= MAXSESSION
)
2518 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
2519 STAT(tunnel_rx_errors
);
2524 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
2525 STAT(tunnel_rx_errors
);
2528 if (t
== TUNNEL_ID_PPPOE
)
2530 LOG(1, s
, t
, "Received UDP packet with tunnel ID reserved for pppoe\n");
2531 STAT(tunnel_rx_errors
);
2536 ns
= ntohs(*(uint16_t *) p
);
2538 nr
= ntohs(*(uint16_t *) p
);
2543 uint16_t o
= ntohs(*(uint16_t *) p
);
2548 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
2549 STAT(tunnel_rx_errors
);
2554 // used to time out old tunnels
2555 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
2556 tunnel
[t
].lastrec
= time_now
;
2560 uint16_t message
= 0xFFFF; // message type
2562 uint8_t mandatory
= 0;
2563 uint16_t asession
= 0; // assigned session
2564 uint32_t amagic
= 0; // magic number
2565 uint8_t aflags
= 0; // flags from last LCF
2566 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2567 char called
[MAXTEL
] = ""; // called number
2568 char calling
[MAXTEL
] = ""; // calling number
2570 if (!config
->cluster_iam_master
)
2572 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
2576 // control messages must have bits 0x80|0x40|0x08
2577 // (type, length and sequence) set, and bits 0x02|0x01
2578 // (offset and priority) clear
2579 if ((*buf
& 0xCB) != 0xC8)
2581 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
2582 STAT(tunnel_rx_errors
);
2586 // check for duplicate tunnel open message
2592 // Is this a duplicate of the first packet? (SCCRQ)
2594 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
2596 if (tunnel
[i
].state
!= TUNNELOPENING
||
2597 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
2598 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
2601 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
2606 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2607 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
2609 // if no tunnel specified, assign one
2612 if (!(t
= new_tunnel()))
2614 LOG(1, 0, 0, "No more tunnels\n");
2615 STAT(tunnel_overflow
);
2619 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
2620 tunnel
[t
].port
= ntohs(addr
->sin_port
);
2621 tunnel
[t
].window
= 4; // default window
2622 tunnel
[t
].indexudp
= indexudpfd
;
2623 STAT(tunnel_created
);
2624 LOG(1, 0, t
, " New tunnel from %s:%u ID %u\n",
2625 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
2628 // If the 'ns' just received is not the 'nr' we're
2629 // expecting, just send an ack and drop it.
2631 // if 'ns' is less, then we got a retransmitted packet.
2632 // if 'ns' is greater than missed a packet. Either way
2633 // we should ignore it.
2634 if (ns
!= tunnel
[t
].nr
)
2636 // is this the sequence we were expecting?
2637 STAT(tunnel_rx_errors
);
2638 LOG(1, 0, t
, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2639 t
, ns
, tunnel
[t
].nr
);
2641 if (l
) // Is this not a ZLB?
2646 // check sequence of this message
2648 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2649 // some to clear maybe?
2650 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2652 controlt
*c
= tunnel
[t
].controls
;
2653 tunnel
[t
].controls
= c
->next
;
2654 tunnel
[t
].controlc
--;
2655 c
->next
= controlfree
;
2658 tunnel
[t
].try = 0; // we have progress
2661 // receiver advance (do here so quoted correctly in any sends below)
2662 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2663 if (skip
< 0) skip
= 0;
2664 if (skip
< tunnel
[t
].controlc
)
2666 // some control packets can now be sent that were previous stuck out of window
2667 int tosend
= tunnel
[t
].window
- skip
;
2668 controlt
*c
= tunnel
[t
].controls
;
2676 tunnel
[t
].try = 0; // first send
2677 tunnelsend(c
->buf
, c
->length
, t
);
2682 if (!tunnel
[t
].controlc
)
2683 tunnel
[t
].retry
= 0; // caught up
2686 { // if not a null message
2691 // Default disconnect cause/message on receipt of CDN. Set to
2692 // more specific value from attribute 1 (result code) or 46
2693 // (disconnect cause) if present below.
2694 int disc_cause_set
= 0;
2695 int disc_cause
= TERM_NAS_REQUEST
;
2696 char const *disc_reason
= "Closed (Received CDN).";
2699 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2701 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2708 LOG(1, s
, t
, "Invalid length in AVP\n");
2709 STAT(tunnel_rx_errors
);
2714 if (flags
& 0x3C) // reserved bits, should be clear
2716 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2718 result
= 2; // general error
2719 error
= 3; // reserved field non-zero
2724 if (*(uint16_t *) (b
))
2726 LOG(2, s
, t
, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b
)));
2728 result
= 2; // general error
2729 error
= 6; // generic vendor-specific error
2730 msg
= "unsupported vendor-specific";
2734 mtype
= ntohs(*(uint16_t *) (b
));
2742 // handle hidden AVPs
2743 if (!*config
->l2tp_secret
)
2745 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2747 result
= 2; // general error
2748 error
= 6; // generic vendor-specific error
2749 msg
= "secret not specified";
2752 if (!session
[s
].random_vector_length
)
2754 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2756 result
= 2; // general error
2757 error
= 6; // generic
2758 msg
= "no random vector";
2763 LOG(2, s
, t
, "Short hidden AVP.\n");
2765 result
= 2; // general error
2766 error
= 2; // length is wrong
2772 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2774 orig_len
= ntohs(*(uint16_t *) b
);
2775 if (orig_len
> n
+ 2)
2777 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2781 result
= 2; // general error
2782 error
= 2; // length is wrong
2791 LOG(4, s
, t
, " AVP %u (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2792 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2796 case 0: // message type
2797 message
= ntohs(*(uint16_t *) b
);
2798 mandatory
= flags
& 0x80;
2799 LOG(4, s
, t
, " Message type = %u (%s)\n", message
, l2tp_code(message
));
2801 case 1: // result code
2803 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2804 char const *resdesc
= "(unknown)";
2805 char const *errdesc
= NULL
;
2810 resdesc
= l2tp_stopccn_result_code(rescode
);
2811 cause
= TERM_LOST_SERVICE
;
2813 else if (message
== 14)
2815 resdesc
= l2tp_cdn_result_code(rescode
);
2817 cause
= TERM_LOST_CARRIER
;
2819 cause
= TERM_ADMIN_RESET
;
2822 LOG(4, s
, t
, " Result Code %u: %s\n", rescode
, resdesc
);
2825 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2826 errdesc
= l2tp_error_code(errcode
);
2827 LOG(4, s
, t
, " Error Code %u: %s\n", errcode
, errdesc
);
2830 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2832 if (cause
&& disc_cause_set
< mtype
) // take cause from attrib 46 in preference
2834 disc_cause_set
= mtype
;
2835 disc_reason
= errdesc
? errdesc
: resdesc
;
2842 case 2: // protocol version
2844 version
= ntohs(*(uint16_t *) (b
));
2845 LOG(4, s
, t
, " Protocol version = %u\n", version
);
2846 if (version
&& version
!= 0x0100)
2847 { // allow 0.0 and 1.0
2848 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2850 result
= 5; // unspported protocol version
2851 error
= 0x0100; // supported version
2857 case 3: // framing capabilities
2859 case 4: // bearer capabilities
2861 case 5: // tie breaker
2862 // We never open tunnels, so we don't care about tie breakers
2864 case 6: // firmware revision
2866 case 7: // host name
2867 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2868 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2869 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2870 // TBA - to send to RADIUS
2872 case 8: // vendor name
2873 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2874 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2875 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2877 case 9: // assigned tunnel
2878 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2879 LOG(4, s
, t
, " Remote tunnel id = %u\n", tunnel
[t
].far
);
2881 case 10: // rx window
2882 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2883 if (!tunnel
[t
].window
)
2884 tunnel
[t
].window
= 1; // window of 0 is silly
2885 LOG(4, s
, t
, " rx window = %u\n", tunnel
[t
].window
);
2887 case 11: // Request Challenge
2889 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2891 build_chap_response(b
, 2, n
, &sendchalresponse
);
2892 else if (message
== 2)
2893 build_chap_response(b
, 3, n
, &sendchalresponse
);
2896 case 13: // receive challenge Response
2897 if (tunnel
[t
].isremotelns
)
2899 recvchalresponse
= calloc(17, 1);
2900 memcpy(recvchalresponse
, b
, (n
< 17) ? n
: 16);
2901 LOG(3, s
, t
, "received challenge response from REMOTE LNS\n");
2904 // Why did they send a response? We never challenge.
2905 LOG(2, s
, t
, " received unexpected challenge response\n");
2908 case 14: // assigned session
2909 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2910 LOG(4, s
, t
, " assigned session = %u\n", asession
);
2912 case 15: // call serial number
2913 LOG(4, s
, t
, " call serial number = %u\n", ntohl(*(uint32_t *)b
));
2915 case 18: // bearer type
2916 LOG(4, s
, t
, " bearer type = %u\n", ntohl(*(uint32_t *)b
));
2919 case 19: // framing type
2920 LOG(4, s
, t
, " framing type = %u\n", ntohl(*(uint32_t *)b
));
2923 case 21: // called number
2924 memset(called
, 0, sizeof(called
));
2925 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2926 LOG(4, s
, t
, " Called <%s>\n", called
);
2928 case 22: // calling number
2929 memset(calling
, 0, sizeof(calling
));
2930 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2931 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2935 case 24: // tx connect speed
2938 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2942 // AS5300s send connect speed as a string
2944 memset(tmp
, 0, sizeof(tmp
));
2945 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2946 session
[s
].tx_connect_speed
= atol(tmp
);
2948 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2950 case 38: // rx connect speed
2953 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2957 // AS5300s send connect speed as a string
2959 memset(tmp
, 0, sizeof(tmp
));
2960 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2961 session
[s
].rx_connect_speed
= atol(tmp
);
2963 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2965 case 25: // Physical Channel ID
2967 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2968 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2971 case 29: // Proxy Authentication Type
2973 uint16_t atype
= ntohs(*(uint16_t *)b
);
2974 LOG(4, s
, t
, " Proxy Auth Type %u (%s)\n", atype
, ppp_auth_type(atype
));
2977 case 30: // Proxy Authentication Name
2980 memset(authname
, 0, sizeof(authname
));
2981 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2982 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2986 case 31: // Proxy Authentication Challenge
2988 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2991 case 32: // Proxy Authentication ID
2993 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2994 LOG(4, s
, t
, " Proxy Auth ID (%u)\n", authid
);
2997 case 33: // Proxy Authentication Response
2998 LOG(4, s
, t
, " Proxy Auth Response\n");
3000 case 27: // last sent lcp
3001 { // find magic number
3002 uint8_t *p
= b
, *e
= p
+ n
;
3003 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
3005 if (*p
== 5 && p
[1] == 6) // Magic-Number
3006 amagic
= ntohl(*(uint32_t *) (p
+ 2));
3007 else if (*p
== 7) // Protocol-Field-Compression
3008 aflags
|= SESSION_PFC
;
3009 else if (*p
== 8) // Address-and-Control-Field-Compression
3010 aflags
|= SESSION_ACFC
;
3015 case 28: // last recv lcp confreq
3017 case 26: // Initial Received LCP CONFREQ
3019 case 39: // seq required - we control it as an LNS anyway...
3021 case 36: // Random Vector
3022 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
3023 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
3024 if (n
> sizeof(session
[s
].random_vector
))
3025 n
= sizeof(session
[s
].random_vector
);
3026 memcpy(session
[s
].random_vector
, b
, n
);
3027 session
[s
].random_vector_length
= n
;
3029 case 46: // ppp disconnect cause
3032 uint16_t code
= ntohs(*(uint16_t *) b
);
3033 uint16_t proto
= ntohs(*(uint16_t *) (b
+ 2));
3034 uint8_t dir
= *(b
+ 4);
3036 LOG(4, s
, t
, " PPP disconnect cause "
3037 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
3038 code
, proto
, dir
, n
- 5, b
+ 5);
3040 disc_cause_set
= mtype
;
3044 case 1: // admin disconnect
3045 disc_cause
= TERM_ADMIN_RESET
;
3046 disc_reason
= "Administrative disconnect";
3048 case 3: // lcp terminate
3049 if (dir
!= 2) break; // 1=peer (LNS), 2=local (LAC)
3050 disc_cause
= TERM_USER_REQUEST
;
3051 disc_reason
= "Normal disconnection";
3053 case 4: // compulsory encryption unavailable
3054 if (dir
!= 1) break; // 1=refused by peer, 2=local
3055 disc_cause
= TERM_USER_ERROR
;
3056 disc_reason
= "Compulsory encryption refused";
3058 case 5: // lcp: fsm timeout
3059 disc_cause
= TERM_PORT_ERROR
;
3060 disc_reason
= "LCP: FSM timeout";
3062 case 6: // lcp: no recognisable lcp packets received
3063 disc_cause
= TERM_PORT_ERROR
;
3064 disc_reason
= "LCP: no recognisable LCP packets";
3066 case 7: // lcp: magic-no error (possibly looped back)
3067 disc_cause
= TERM_PORT_ERROR
;
3068 disc_reason
= "LCP: magic-no error (possible loop)";
3070 case 8: // lcp: echo request timeout
3071 disc_cause
= TERM_PORT_ERROR
;
3072 disc_reason
= "LCP: echo request timeout";
3074 case 13: // auth: fsm timeout
3075 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3076 disc_reason
= "Authentication: FSM timeout";
3078 case 15: // auth: unacceptable auth protocol
3079 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3080 disc_reason
= "Unacceptable authentication protocol";
3082 case 16: // auth: authentication failed
3083 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3084 disc_reason
= "Authentication failed";
3086 case 17: // ncp: fsm timeout
3087 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3088 disc_reason
= "NCP: FSM timeout";
3090 case 18: // ncp: no ncps available
3091 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3092 disc_reason
= "NCP: no NCPs available";
3094 case 19: // ncp: failure to converge on acceptable address
3095 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3096 disc_reason
= (dir
== 1)
3097 ? "NCP: too many Configure-Naks received from peer"
3098 : "NCP: too many Configure-Naks sent to peer";
3100 case 20: // ncp: user not permitted to use any address
3101 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3102 disc_reason
= (dir
== 1)
3103 ? "NCP: local link address not acceptable to peer"
3104 : "NCP: remote link address not acceptable";
3111 static char e
[] = "unknown AVP 0xXXXX";
3112 LOG(2, s
, t
, " Unknown AVP type %u\n", mtype
);
3114 result
= 2; // general error
3115 error
= 8; // unknown mandatory AVP
3116 sprintf((msg
= e
) + 14, "%04x", mtype
);
3123 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
3127 case 1: // SCCRQ - Start Control Connection Request
3128 tunnel
[t
].state
= TUNNELOPENING
;
3129 LOG(3, s
, t
, "Received SCCRQ\n");
3130 if (main_quit
!= QUIT_SHUTDOWN
)
3132 LOG(3, s
, t
, "sending SCCRP\n");
3133 controlt
*c
= controlnew(2); // sending SCCRP
3134 control16(c
, 2, version
, 1); // protocol version
3135 control32(c
, 3, 3, 1); // framing
3136 controls(c
, 7, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
, 1); // host name
3137 if (sendchalresponse
) controlb(c
, 13, sendchalresponse
, 16, 1); // Send Challenge response
3138 control16(c
, 9, t
, 1); // assigned tunnel
3139 controladd(c
, 0, t
); // send the resply
3143 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
3147 tunnel
[t
].state
= TUNNELOPEN
;
3148 tunnel
[t
].lastrec
= time_now
;
3149 LOG(3, s
, t
, "Received SCCRP\n");
3150 if (main_quit
!= QUIT_SHUTDOWN
)
3152 if (tunnel
[t
].isremotelns
&& recvchalresponse
)
3156 lac_calc_rlns_auth(t
, 2, hash
); // id = 2 (SCCRP)
3157 // check authenticator
3158 if (memcmp(hash
, recvchalresponse
, 16) == 0)
3160 LOG(3, s
, t
, "sending SCCCN to REMOTE LNS\n");
3161 controlt
*c
= controlnew(3); // sending SCCCN
3162 controls(c
, 7, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
, 1); // host name
3163 controls(c
, 8, Vendor_name
, 1); // Vendor name
3164 control16(c
, 2, version
, 1); // protocol version
3165 control32(c
, 3, 3, 1); // framing Capabilities
3166 if (sendchalresponse
) controlb(c
, 13, sendchalresponse
, 16, 1); // Challenge response
3167 control16(c
, 9, t
, 1); // assigned tunnel
3168 controladd(c
, 0, t
); // send
3172 tunnelshutdown(t
, "Bad chap response from REMOTE LNS", 4, 0, 0);
3178 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
3182 LOG(3, s
, t
, "Received SCCN\n");
3183 tunnel
[t
].state
= TUNNELOPEN
;
3184 tunnel
[t
].lastrec
= time_now
;
3185 controlnull(t
); // ack
3188 LOG(3, s
, t
, "Received StopCCN\n");
3189 controlnull(t
); // ack
3190 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
3193 LOG(3, s
, t
, "Received HELLO\n");
3194 controlnull(t
); // simply ACK
3198 LOG(3, s
, t
, "Received OCRQ\n");
3202 LOG(3, s
, t
, "Received OCRO\n");
3206 LOG(3, s
, t
, "Received OCCN\n");
3209 LOG(3, s
, t
, "Received ICRQ\n");
3210 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
3212 controlt
*c
= controlnew(11); // ICRP
3214 LOG(3, s
, t
, "Sending ICRP\n");
3217 sessionfree
= session
[s
].next
;
3218 memset(&session
[s
], 0, sizeof(session
[s
]));
3220 if (s
> config
->cluster_highest_sessionid
)
3221 config
->cluster_highest_sessionid
= s
;
3223 session
[s
].opened
= time_now
;
3224 session
[s
].tunnel
= t
;
3225 session
[s
].far
= asession
;
3226 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3227 LOG(3, s
, t
, "New session (%u/%u)\n", tunnel
[t
].far
, session
[s
].far
);
3228 control16(c
, 14, s
, 1); // assigned session
3229 controladd(c
, asession
, t
); // send the reply
3231 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
3232 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
3234 session
[s
].ppp
.phase
= Establish
;
3235 session
[s
].ppp
.lcp
= Starting
;
3237 STAT(session_created
);
3242 controlt
*c
= controlnew(14); // CDN
3243 LOG(3, s
, t
, "Sending CDN\n");
3246 STAT(session_overflow
);
3247 LOG(1, 0, t
, "No free sessions\n");
3248 control16(c
, 1, 4, 0); // temporary lack of resources
3251 control16(c
, 1, 2, 7); // shutting down, try another
3253 controladd(c
, asession
, t
); // send the message
3257 LOG(3, s
, t
, "Received ICRP\n");
3258 if (session
[s
].forwardtosession
)
3260 controlt
*c
= controlnew(12); // ICCN
3262 session
[s
].opened
= time_now
;
3263 session
[s
].tunnel
= t
;
3264 session
[s
].far
= asession
;
3265 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3267 control32(c
, 19, 1, 1); // Framing Type
3268 control32(c
, 24, 10000000, 1); // Tx Connect Speed
3269 controladd(c
, asession
, t
); // send the message
3270 LOG(3, s
, t
, "Sending ICCN\n");
3274 LOG(3, s
, t
, "Received ICCN\n");
3275 if (amagic
== 0) amagic
= time_now
;
3276 session
[s
].magic
= amagic
; // set magic number
3277 session
[s
].flags
= aflags
; // set flags received
3278 session
[s
].mru
= PPPoE_MRU
; // default
3279 controlnull(t
); // ack
3282 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
3283 sess_local
[s
].ppp_mru
= MRU
;
3285 // Set multilink options before sending initial LCP packet
3286 sess_local
[s
].mp_mrru
= 1614;
3287 sess_local
[s
].mp_epdis
= ntohl(config
->iftun_address
? config
->iftun_address
: my_address
);
3290 change_state(s
, lcp
, RequestSent
);
3294 LOG(3, s
, t
, "Received CDN\n");
3295 controlnull(t
); // ack
3296 sessionshutdown(s
, disc_reason
, CDN_NONE
, disc_cause
);
3299 LOG(1, s
, t
, "Missing message type\n");
3302 STAT(tunnel_rx_errors
);
3304 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
3306 LOG(1, s
, t
, "Unknown message type %u\n", message
);
3309 if (sendchalresponse
) free(sendchalresponse
);
3310 if (recvchalresponse
) free(recvchalresponse
);
3311 cluster_send_tunnel(t
);
3315 LOG(4, s
, t
, " Got a ZLB ack\n");
3322 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
3323 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
3324 { // HDLC address header, discard
3330 LOG(1, s
, t
, "Short ppp length %d\n", l
);
3331 STAT(tunnel_rx_errors
);
3341 proto
= ntohs(*(uint16_t *) p
);
3346 if (session
[s
].forwardtosession
)
3348 LOG(5, s
, t
, "Forwarding data session to session %u\n", session
[s
].forwardtosession
);
3349 // Forward to LAC/BAS or Remote LNS session
3350 lac_session_forward(buf
, len
, s
, proto
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3353 else if (config
->auth_tunnel_change_addr_src
)
3355 if (tunnel
[t
].ip
!= ntohl(addr
->sin_addr
.s_addr
) &&
3356 tunnel
[t
].port
== ntohs(addr
->sin_port
))
3358 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3359 LOG(5, s
, t
, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3360 fmtaddr(htonl(tunnel
[t
].ip
), 0), fmtaddr(addr
->sin_addr
.s_addr
, 0));
3362 tunnel
[t
].ip
= ntohl(addr
->sin_addr
.s_addr
);
3366 if (s
&& !session
[s
].opened
) // Is something wrong??
3368 if (!config
->cluster_iam_master
)
3370 // Pass it off to the master to deal with..
3371 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3375 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
3376 STAT(tunnel_rx_errors
);
3380 if (proto
== PPPPAP
)
3382 session
[s
].last_packet
= time_now
;
3383 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3384 processpap(s
, t
, p
, l
);
3386 else if (proto
== PPPCHAP
)
3388 session
[s
].last_packet
= time_now
;
3389 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3390 processchap(s
, t
, p
, l
);
3392 else if (proto
== PPPLCP
)
3394 session
[s
].last_packet
= time_now
;
3395 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3396 processlcp(s
, t
, p
, l
);
3398 else if (proto
== PPPIPCP
)
3400 session
[s
].last_packet
= time_now
;
3401 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3402 processipcp(s
, t
, p
, l
);
3404 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
3406 session
[s
].last_packet
= time_now
;
3407 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3408 processipv6cp(s
, t
, p
, l
);
3410 else if (proto
== PPPCCP
)
3412 session
[s
].last_packet
= time_now
;
3413 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3414 processccp(s
, t
, p
, l
);
3416 else if (proto
== PPPIP
)
3420 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3421 return; // closing session, PPP not processed
3424 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3425 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3427 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3431 processipin(s
, t
, p
, l
);
3433 else if (proto
== PPPMP
)
3437 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3438 return; // closing session, PPP not processed
3441 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3442 if (!config
->cluster_iam_master
)
3444 // The fragments reconstruction is managed by the Master.
3445 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3449 processmpin(s
, t
, p
, l
);
3451 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
3455 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3456 return; // closing session, PPP not processed
3459 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3460 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3462 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3466 if (!config
->cluster_iam_master
)
3468 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
3469 if (*(p
+ 6) == 17 && *(p
+ 24) == 0xFF && *(p
+ 25) == 2 &&
3470 *(uint32_t *)(p
+ 26) == 0 && *(uint32_t *)(p
+ 30) == 0 &&
3471 *(uint16_t *)(p
+ 34) == 0 && *(p
+ 36) == 0 && *(p
+ 37) == 1 && *(p
+ 38) == 0 && *(p
+ 39) == 2 &&
3472 *(p
+ 40) == 2 && *(p
+ 41) == 0x22 && *(p
+ 42) == 2 && *(p
+ 43) == 0x23)
3474 // DHCPV6 must be managed by the Master.
3475 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
);
3480 processipv6in(s
, t
, p
, l
);
3482 else if (session
[s
].ppp
.lcp
== Opened
)
3484 session
[s
].last_packet
= time_now
;
3485 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
, indexudpfd
); return; }
3486 protoreject(s
, t
, p
, l
, proto
);
3490 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3491 proto
, ppp_state(session
[s
].ppp
.lcp
));
3496 // read and process packet on tun
3497 // (i.e. this routine writes to buf[-8]).
3498 static void processtun(uint8_t * buf
, int len
)
3500 LOG_HEX(5, "Receive TUN Data", buf
, len
);
3501 STAT(tun_rx_packets
);
3502 INC_STAT(tun_rx_bytes
, len
);
3510 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
3511 STAT(tun_rx_errors
);
3515 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
3516 processipout(buf
, len
);
3517 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
3518 && config
->ipv6_prefix
.s6_addr
[0])
3519 processipv6out(buf
, len
);
3524 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3525 // that we look at the whole of the tunnel, radius and session tables
3527 static void regular_cleanups(double period
)
3529 // Next tunnel, radius and session to check for actions on.
3530 static tunnelidt t
= 0;
3532 static sessionidt s
= 0;
3545 // divide up tables into slices based on the last run
3546 t_slice
= config
->cluster_highest_tunnelid
* period
;
3547 r_slice
= (MAXRADIUS
- 1) * period
;
3548 s_slice
= config
->cluster_highest_sessionid
* period
;
3552 else if (t_slice
> config
->cluster_highest_tunnelid
)
3553 t_slice
= config
->cluster_highest_tunnelid
;
3557 else if (r_slice
> (MAXRADIUS
- 1))
3558 r_slice
= MAXRADIUS
- 1;
3562 else if (s_slice
> config
->cluster_highest_sessionid
)
3563 s_slice
= config
->cluster_highest_sessionid
;
3565 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
3567 for (i
= 0; i
< t_slice
; i
++)
3570 if (t
> config
->cluster_highest_tunnelid
)
3573 if (t
== TUNNEL_ID_PPPOE
)
3576 // check for expired tunnels
3577 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
3579 STAT(tunnel_timeout
);
3580 tunnelkill(t
, "Expired");
3584 // check for message resend
3585 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
3587 // resend pending messages as timeout on reply
3588 if (tunnel
[t
].retry
<= TIME
)
3590 controlt
*c
= tunnel
[t
].controls
;
3591 uint16_t w
= tunnel
[t
].window
;
3592 tunnel
[t
].try++; // another try
3593 if (tunnel
[t
].try > 5)
3594 tunnelkill(t
, "Timeout on control message"); // game over
3598 tunnelsend(c
->buf
, c
->length
, t
);
3606 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
3608 if (!config
->disable_sending_hello
)
3610 controlt
*c
= controlnew(6); // sending HELLO
3611 controladd(c
, 0, t
); // send the message
3612 LOG(3, 0, t
, "Sending HELLO message\n");
3617 // Check for tunnel changes requested from the CLI
3618 if ((a
= cli_tunnel_actions
[t
].action
))
3620 cli_tunnel_actions
[t
].action
= 0;
3621 if (a
& CLI_TUN_KILL
)
3623 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
3624 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
3630 for (i
= 0; i
< r_slice
; i
++)
3636 if (!radius
[r
].state
)
3639 if (radius
[r
].retry
<= TIME
)
3646 for (i
= 0; i
< s_slice
; i
++)
3649 if (s
> config
->cluster_highest_sessionid
)
3652 if (!session
[s
].opened
) // Session isn't in use
3655 // check for expired sessions
3658 if (session
[s
].die
<= TIME
)
3660 sessionkill(s
, "Expired");
3667 if (sess_local
[s
].lcp
.restart
<= time_now
)
3669 int next_state
= session
[s
].ppp
.lcp
;
3670 switch (session
[s
].ppp
.lcp
)
3674 next_state
= RequestSent
;
3677 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
3679 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
3680 sendlcp(s
, session
[s
].tunnel
);
3681 change_state(s
, lcp
, next_state
);
3685 sessionshutdown(s
, "No response to LCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3686 STAT(session_timeout
);
3696 if (sess_local
[s
].ipcp
.restart
<= time_now
)
3698 int next_state
= session
[s
].ppp
.ipcp
;
3699 switch (session
[s
].ppp
.ipcp
)
3703 next_state
= RequestSent
;
3706 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
3708 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
3709 sendipcp(s
, session
[s
].tunnel
);
3710 change_state(s
, ipcp
, next_state
);
3714 sessionshutdown(s
, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3715 STAT(session_timeout
);
3725 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
3727 int next_state
= session
[s
].ppp
.ipv6cp
;
3728 switch (session
[s
].ppp
.ipv6cp
)
3732 next_state
= RequestSent
;
3735 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
3737 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
3738 sendipv6cp(s
, session
[s
].tunnel
);
3739 change_state(s
, ipv6cp
, next_state
);
3743 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
3744 change_state(s
, ipv6cp
, Stopped
);
3751 if (sess_local
[s
].ccp
.restart
<= time_now
)
3753 int next_state
= session
[s
].ppp
.ccp
;
3754 switch (session
[s
].ppp
.ccp
)
3758 next_state
= RequestSent
;
3761 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
3763 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
3764 sendccp(s
, session
[s
].tunnel
);
3765 change_state(s
, ccp
, next_state
);
3769 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
3770 change_state(s
, ccp
, Stopped
);
3777 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3778 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= config
->idle_echo_timeout
))
3780 sessionshutdown(s
, "No response to LCP ECHO requests.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3781 STAT(session_timeout
);
3786 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3787 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= config
->echo_timeout
) &&
3788 (time_now
- sess_local
[s
].last_echo
>= config
->echo_timeout
))
3790 uint8_t b
[MAXETHER
];
3792 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
, 1, 0, 0);
3796 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
3797 *(uint16_t *)(q
+ 2) = htons(8); // Length
3798 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
3800 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
3801 (int)(time_now
- session
[s
].last_packet
));
3803 tunnelsend(b
, (q
- b
) + 8, session
[s
].tunnel
); // send it
3804 sess_local
[s
].last_echo
= time_now
;
3808 // Drop sessions who have reached session_timeout seconds
3809 if (session
[s
].session_timeout
)
3811 bundleidt bid
= session
[s
].bundle
;
3814 if (time_now
- bundle
[bid
].last_check
>= 1)
3816 bundle
[bid
].online_time
+= (time_now
- bundle
[bid
].last_check
) * bundle
[bid
].num_of_links
;
3817 bundle
[bid
].last_check
= time_now
;
3818 if (bundle
[bid
].online_time
>= session
[s
].session_timeout
)
3821 for (ses
= bundle
[bid
].num_of_links
- 1; ses
>= 0; ses
--)
3823 sessionshutdown(bundle
[bid
].members
[ses
], "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3830 else if (time_now
- session
[s
].opened
>= session
[s
].session_timeout
)
3832 sessionshutdown(s
, "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3838 // Drop sessions who have reached idle_timeout seconds
3839 if (session
[s
].last_data
&& session
[s
].idle_timeout
&& (time_now
- session
[s
].last_data
>= session
[s
].idle_timeout
))
3841 sessionshutdown(s
, "Idle Timeout Reached", CDN_ADMIN_DISC
, TERM_IDLE_TIMEOUT
);
3842 STAT(session_timeout
);
3847 // Check for actions requested from the CLI
3848 if ((a
= cli_session_actions
[s
].action
))
3852 cli_session_actions
[s
].action
= 0;
3853 if (a
& CLI_SESS_KILL
)
3855 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
3856 sessionshutdown(s
, "Requested by administrator.", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
3857 a
= 0; // dead, no need to check for other actions
3861 if (a
& CLI_SESS_NOSNOOP
)
3863 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
3864 session
[s
].snoop_ip
= 0;
3865 session
[s
].snoop_port
= 0;
3869 else if (a
& CLI_SESS_SNOOP
)
3871 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%u)\n",
3872 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
3873 cli_session_actions
[s
].snoop_port
);
3875 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
3876 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
3881 if (a
& CLI_SESS_NOTHROTTLE
)
3883 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
3884 throttle_session(s
, 0, 0);
3888 else if (a
& CLI_SESS_THROTTLE
)
3890 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3891 cli_session_actions
[s
].throttle_in
,
3892 cli_session_actions
[s
].throttle_out
);
3894 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3899 if (a
& CLI_SESS_NOFILTER
)
3901 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3902 filter_session(s
, 0, 0);
3906 else if (a
& CLI_SESS_FILTER
)
3908 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3909 cli_session_actions
[s
].filter_in
,
3910 cli_session_actions
[s
].filter_out
);
3912 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3918 cluster_send_session(s
);
3921 // RADIUS interim accounting
3922 if (config
->radius_accounting
&& config
->radius_interim
> 0
3923 && session
[s
].ip
&& !session
[s
].walled_garden
3924 && !sess_local
[s
].radius
// RADIUS already in progress
3925 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
3926 && session
[s
].flags
& SESSION_STARTED
)
3928 int rad
= radiusnew(s
);
3931 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3932 STAT(radius_overflow
);
3936 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3937 session
[s
].user
, session
[s
].unique_id
);
3939 radiussend(rad
, RADIUSINTERIM
);
3940 sess_local
[s
].last_interim
= time_now
;
3945 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3946 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3950 // Are we in the middle of a tunnel update, or radius
3953 static int still_busy(void)
3956 static clockt last_talked
= 0;
3957 static clockt start_busy_wait
= 0;
3960 static time_t stopped_bgp
= 0;
3965 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3967 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3968 if (bgp_peers
[i
].state
== Established
)
3969 bgp_stop(&bgp_peers
[i
]);
3971 stopped_bgp
= time_now
;
3973 if (!config
->cluster_iam_master
)
3975 // we don't want to become master
3976 cluster_send_ping(0);
3982 if (!config
->cluster_iam_master
&& time_now
< (stopped_bgp
+ QUIT_DELAY
))
3987 if (!config
->cluster_iam_master
)
3990 if (main_quit
== QUIT_SHUTDOWN
)
3992 static int dropped
= 0;
3997 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3998 for (i
= 1; i
< MAXTUNNEL
; i
++)
3999 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
4000 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
4006 if (start_busy_wait
== 0)
4007 start_busy_wait
= TIME
;
4009 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
4011 if (!tunnel
[i
].controlc
)
4014 if (last_talked
!= TIME
)
4016 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i
);
4022 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
4023 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
4025 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
4029 for (i
= 1; i
< MAXRADIUS
; i
++)
4031 if (radius
[i
].state
== RADIUSNULL
)
4033 if (radius
[i
].state
== RADIUSWAIT
)
4036 if (last_talked
!= TIME
)
4038 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i
, radius
[i
].session
);
4048 # include <sys/epoll.h>
4050 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
4051 # include "fake_epoll.h"
4054 // the base set of fds polled: cli, cluster, tun, udp (MAX_UDPFD), control, dae, netlink, udplac, pppoedisc, pppoesess
4055 #define BASE_FDS (9 + MAX_UDPFD)
4057 // additional polled fds
4059 # define EXTRA_FDS BGP_NUM_PEERS
4061 # define EXTRA_FDS 0
4064 // main loop - gets packets on tun or udp and processes them
4065 static void mainloop(void)
4069 uint8_t *p
= buf
+ 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
4070 // and the forwarded pppoe session
4071 int size_bufp
= sizeof(buf
) - 32;
4072 clockt next_cluster_ping
= 0; // send initial ping immediately
4073 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
4074 int maxevent
= sizeof(events
)/sizeof(*events
);
4076 if ((epollfd
= epoll_create(maxevent
)) < 0)
4078 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
4082 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",
4083 clifd
, cluster_sockfd
, tunfd
, udpfd
[0], controlfd
, daefd
, nlfd
, udplacfd
, pppoediscfd
, pppoesessfd
);
4085 /* setup our fds to poll for input */
4087 static struct event_data d
[BASE_FDS
];
4088 struct epoll_event e
;
4095 d
[i
].type
= FD_TYPE_CLI
;
4096 e
.data
.ptr
= &d
[i
++];
4097 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
4100 d
[i
].type
= FD_TYPE_CLUSTER
;
4101 e
.data
.ptr
= &d
[i
++];
4102 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
4104 d
[i
].type
= FD_TYPE_TUN
;
4105 e
.data
.ptr
= &d
[i
++];
4106 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
4108 d
[i
].type
= FD_TYPE_CONTROL
;
4109 e
.data
.ptr
= &d
[i
++];
4110 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
4112 d
[i
].type
= FD_TYPE_DAE
;
4113 e
.data
.ptr
= &d
[i
++];
4114 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
4116 d
[i
].type
= FD_TYPE_NETLINK
;
4117 e
.data
.ptr
= &d
[i
++];
4118 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, nlfd
, &e
);
4120 d
[i
].type
= FD_TYPE_PPPOEDISC
;
4121 e
.data
.ptr
= &d
[i
++];
4122 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoediscfd
, &e
);
4124 d
[i
].type
= FD_TYPE_PPPOESESS
;
4125 e
.data
.ptr
= &d
[i
++];
4126 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoesessfd
, &e
);
4128 for (j
= 0; j
< config
->nbudpfd
; j
++)
4130 d
[i
].type
= FD_TYPE_UDP
;
4132 e
.data
.ptr
= &d
[i
++];
4133 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
[j
], &e
);
4138 signal(SIGPIPE
, SIG_IGN
);
4139 bgp_setup(config
->as_number
);
4140 if (config
->bind_address
)
4141 bgp_add_route(config
->bind_address
, 0xffffffff);
4143 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
4145 if (config
->neighbour
[i
].name
[0])
4146 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
4147 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
4148 config
->neighbour
[i
].hold
, config
->neighbour
[i
].update_source
,
4149 0); /* 0 = routing disabled */
4153 while (!main_quit
|| still_busy())
4163 config
->reload_config
++;
4166 if (config
->reload_config
)
4168 config
->reload_config
= 0;
4176 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
4177 STAT(select_called
);
4182 if (errno
== EINTR
||
4183 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
4186 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
4192 struct sockaddr_in addr
;
4193 struct in_addr local
;
4196 int udp_ready
[MAX_UDPFD
+ 1] = INIT_TABUDPVAR
;
4197 int pppoesess_ready
= 0;
4198 int pppoesess_pkts
= 0;
4200 int cluster_ready
= 0;
4201 int udp_pkts
[MAX_UDPFD
+ 1] = INIT_TABUDPVAR
;
4203 int cluster_pkts
= 0;
4205 uint32_t bgp_events
[BGP_NUM_PEERS
];
4206 memset(bgp_events
, 0, sizeof(bgp_events
));
4209 for (c
= n
, i
= 0; i
< c
; i
++)
4211 struct event_data
*d
= events
[i
].data
.ptr
;
4215 case FD_TYPE_CLI
: // CLI connections
4219 alen
= sizeof(addr
);
4220 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
4226 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
4232 // these are handled below, with multiple interleaved reads
4233 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
4234 case FD_TYPE_TUN
: tun_ready
++; break;
4235 case FD_TYPE_UDP
: udp_ready
[d
->index
]++; break;
4236 case FD_TYPE_PPPOESESS
: pppoesess_ready
++; break;
4238 case FD_TYPE_PPPOEDISC
: // pppoe discovery
4239 s
= read(pppoediscfd
, p
, size_bufp
);
4240 if (s
> 0) process_pppoe_disc(p
, s
);
4244 case FD_TYPE_CONTROL
: // nsctl commands
4245 alen
= sizeof(addr
);
4246 s
= recvfromto(controlfd
, p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4247 if (s
> 0) processcontrol(p
, s
, &addr
, alen
, &local
);
4251 case FD_TYPE_DAE
: // DAE requests
4252 alen
= sizeof(addr
);
4253 s
= recvfromto(daefd
, p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4254 if (s
> 0) processdae(p
, s
, &addr
, alen
, &local
);
4258 case FD_TYPE_RADIUS
: // RADIUS response
4259 alen
= sizeof(addr
);
4260 s
= recvfrom(radfds
[d
->index
], p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
4261 if (s
>= 0 && config
->cluster_iam_master
)
4263 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
4264 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
4265 processrad(p
, s
, d
->index
);
4267 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4268 fmtaddr(addr
.sin_addr
.s_addr
, 0));
4276 bgp_events
[d
->index
] = events
[i
].events
;
4281 case FD_TYPE_NETLINK
:
4283 struct nlmsghdr
*nh
= (struct nlmsghdr
*)p
;
4284 s
= netlink_recv(p
, size_bufp
);
4285 if (nh
->nlmsg_type
== NLMSG_ERROR
)
4287 struct nlmsgerr
*errmsg
= NLMSG_DATA(nh
);
4290 if (errmsg
->msg
.nlmsg_seq
< min_initok_nlseqnum
)
4292 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg
[nh
->nlmsg_seq
], strerror(-errmsg
->error
));
4296 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg
->error
));
4301 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
);
4307 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
4312 bgp_process(bgp_events
);
4315 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
4317 for (j
= 0; j
< config
->nbudpfd
; j
++)
4319 // L2TP and L2TP REMOTE LNS
4322 alen
= sizeof(addr
);
4323 if ((s
= recvfrom(udpfd
[j
], p
, size_bufp
, 0, (void *) &addr
, &alen
)) > 0)
4325 processudp(p
, s
, &addr
, j
);
4339 if ((s
= read(tunfd
, p
, size_bufp
)) > 0)
4352 if (pppoesess_ready
)
4354 if ((s
= read(pppoesessfd
, p
, size_bufp
)) > 0)
4356 process_pppoe_sess(p
, s
);
4361 pppoesess_ready
= 0;
4369 alen
= sizeof(addr
);
4370 if ((s
= recvfrom(cluster_sockfd
, p
, size_bufp
, MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
4372 processcluster(p
, s
, addr
.sin_addr
.s_addr
);
4383 if (udp_pkts
[0] > 1 || tun_pkts
> 1 || cluster_pkts
> 1)
4384 STAT(multi_read_used
);
4386 if (c
>= config
->multi_read_count
)
4388 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4389 config
->multi_read_count
, udp_pkts
[0], tun_pkts
, cluster_pkts
, pppoesess_pkts
);
4390 STAT(multi_read_exceeded
);
4396 /* no event received, but timers could still have expired */
4397 bgp_process_peers_timers();
4402 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
4404 // Log current traffic stats
4405 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4406 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4407 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
4408 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
4409 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
4411 udp_tx
= udp_rx
= 0;
4412 udp_rx_pkt
= eth_rx_pkt
= 0;
4413 eth_tx
= eth_rx
= 0;
4416 if (config
->dump_speed
)
4417 printf("%s\n", config
->bandwidth
);
4419 // Update the internal time counter
4420 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4424 struct param_timer p
= { time_now
};
4425 run_plugins(PLUGIN_TIMER
, &p
);
4429 // Runs on every machine (master and slaves).
4430 if (next_cluster_ping
<= TIME
)
4432 // Check to see which of the cluster is still alive..
4434 cluster_send_ping(basetime
); // Only does anything if we're a slave
4435 cluster_check_master(); // ditto.
4437 cluster_heartbeat(); // Only does anything if we're a master.
4438 cluster_check_slaves(); // ditto.
4440 master_update_counts(); // If we're a slave, send our byte counters to our master.
4442 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
4443 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
4445 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
4448 if (!config
->cluster_iam_master
)
4451 // Run token bucket filtering queue..
4452 // Only run it every 1/10th of a second.
4454 static clockt last_run
= 0;
4455 if (last_run
!= TIME
)
4462 // Handle timeouts, retries etc.
4464 static double last_clean
= 0;
4468 TIME
= now(&this_clean
);
4469 diff
= this_clean
- last_clean
;
4471 // Run during idle time (after we've handled
4472 // all incoming packets) or every 1/10th sec
4473 if (!more
|| diff
> 0.1)
4475 regular_cleanups(diff
);
4476 last_clean
= this_clean
;
4480 if (*config
->accounting_dir
)
4482 static clockt next_acct
= 0;
4483 static clockt next_shut_acct
= 0;
4485 if (next_acct
<= TIME
)
4487 // Dump accounting data
4488 next_acct
= TIME
+ ACCT_TIME
;
4489 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4492 else if (next_shut_acct
<= TIME
)
4494 // Dump accounting data for shutdown sessions
4495 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4502 // Are we the master and shutting down??
4503 if (config
->cluster_iam_master
)
4504 cluster_heartbeat(); // Flush any queued changes..
4506 // Ok. Notify everyone we're shutting down. If we're
4507 // the master, this will force an election.
4508 cluster_send_ping(0);
4511 // Important!!! We MUST not process any packets past this point!
4512 LOG(1, 0, 0, "Shutdown complete\n");
4515 static void stripdomain(char *host
)
4519 if ((p
= strchr(host
, '.')))
4525 FILE *resolv
= fopen("/etc/resolv.conf", "r");
4531 while (fgets(buf
, sizeof(buf
), resolv
))
4533 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
4536 if (!isspace(buf
[6]))
4540 while (isspace(*b
)) b
++;
4545 while (*b
&& !isspace(*b
)) b
++;
4547 if (buf
[0] == 'd') // domain is canonical
4553 // first search line
4556 // hold, may be subsequent domain line
4557 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
4568 int hl
= strlen(host
);
4569 int dl
= strlen(domain
);
4570 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
4571 host
[hl
-dl
- 1] = 0;
4575 *p
= 0; // everything after first dot
4580 // Init data structures
4581 static void initdata(int optdebug
, char *optconfig
)
4585 if (!(config
= shared_malloc(sizeof(configt
))))
4587 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
4591 memset(config
, 0, sizeof(configt
));
4592 time(&config
->start_time
);
4593 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
4594 config
->debug
= optdebug
;
4595 config
->num_tbfs
= MAXTBFS
;
4596 config
->rl_rate
= 28; // 28kbps
4597 config
->cluster_mcast_ttl
= 1;
4598 config
->cluster_master_min_adv
= 1;
4599 config
->ppp_restart_time
= 3;
4600 config
->ppp_max_configure
= 10;
4601 config
->ppp_max_failure
= 5;
4602 config
->kill_timedout_sessions
= 1;
4603 strcpy(config
->random_device
, RANDOMDEVICE
);
4604 // Set default value echo_timeout and idle_echo_timeout
4605 config
->echo_timeout
= ECHO_TIMEOUT
;
4606 config
->idle_echo_timeout
= IDLE_ECHO_TIMEOUT
;
4608 log_stream
= stderr
;
4611 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
4613 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
4616 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
4619 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
4621 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
4624 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
4626 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
4629 if (!(bundle
= shared_malloc(sizeof(bundlet
) * MAXBUNDLE
)))
4631 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno
));
4634 if (!(frag
= shared_malloc(sizeof(fragmentationt
) * MAXBUNDLE
)))
4636 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno
));
4639 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
4641 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
4645 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
4647 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
4651 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
4653 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
4657 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
4659 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
4663 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
4665 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
4668 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
4670 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
4672 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
4675 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
4677 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
4679 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
4682 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
4684 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
4685 memset(bundle
, 0, sizeof(bundlet
) * MAXBUNDLE
);
4686 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
4687 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
4688 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
4690 // Put all the sessions on the free list marked as undefined.
4691 for (i
= 1; i
< MAXSESSION
; i
++)
4693 session
[i
].next
= i
+ 1;
4694 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
4696 session
[MAXSESSION
- 1].next
= 0;
4699 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4700 for (i
= 1; i
< MAXTUNNEL
; i
++)
4701 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
4703 for (i
= 1; i
< MAXBUNDLE
; i
++) {
4704 bundle
[i
].state
= BUNDLEUNDEF
;
4709 // Grab my hostname unless it's been specified
4710 gethostname(hostname
, sizeof(hostname
));
4711 stripdomain(hostname
);
4714 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
4717 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
4719 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
4724 lac_initremotelnsdata();
4729 static int assign_ip_address(sessionidt s
)
4733 time_t best_time
= time_now
;
4734 char *u
= session
[s
].user
;
4738 CSTAT(assign_ip_address
);
4740 for (i
= 1; i
< ip_pool_size
; i
++)
4742 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
4745 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
4752 if (ip_address_pool
[i
].last
< best_time
)
4755 if (!(best_time
= ip_address_pool
[i
].last
))
4756 break; // never used, grab this one
4762 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
4766 session
[s
].ip
= ip_address_pool
[best
].address
;
4767 session
[s
].ip_pool_index
= best
;
4768 ip_address_pool
[best
].assigned
= 1;
4769 ip_address_pool
[best
].last
= time_now
;
4770 ip_address_pool
[best
].session
= s
;
4771 if (session
[s
].walled_garden
)
4772 /* Don't track addresses of users in walled garden (note: this
4773 means that their address isn't "sticky" even if they get
4775 ip_address_pool
[best
].user
[0] = 0;
4777 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
4780 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
4781 reuse
? "Reusing" : "Allocating", best
);
4786 static void free_ip_address(sessionidt s
)
4788 int i
= session
[s
].ip_pool_index
;
4791 CSTAT(free_ip_address
);
4794 return; // what the?
4796 if (i
< 0) // Is this actually part of the ip pool?
4800 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
4802 ip_address_pool
[i
].assigned
= 0;
4803 ip_address_pool
[i
].session
= 0;
4804 ip_address_pool
[i
].last
= time_now
;
4808 // Fsck the address pool against the session table.
4809 // Normally only called when we become a master.
4811 // This isn't perfect: We aren't keep tracking of which
4812 // users used to have an IP address.
4814 void rebuild_address_pool(void)
4819 // Zero the IP pool allocation, and build
4820 // a map from IP address to pool index.
4821 for (i
= 1; i
< MAXIPPOOL
; ++i
)
4823 ip_address_pool
[i
].assigned
= 0;
4824 ip_address_pool
[i
].session
= 0;
4825 if (!ip_address_pool
[i
].address
)
4828 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
4831 for (i
= 0; i
< MAXSESSION
; ++i
)
4834 if (!(session
[i
].opened
&& session
[i
].ip
))
4837 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
4839 if (session
[i
].ip_pool_index
< 0)
4841 // Not allocated out of the pool.
4842 if (ipid
< 1) // Not found in the pool either? good.
4845 LOG(0, i
, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4846 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
4848 // Fall through and process it as part of the pool.
4852 if (ipid
> MAXIPPOOL
|| ipid
< 0)
4854 LOG(0, i
, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
4856 session
[i
].ip_pool_index
= ipid
;
4860 ip_address_pool
[ipid
].assigned
= 1;
4861 ip_address_pool
[ipid
].session
= i
;
4862 ip_address_pool
[ipid
].last
= time_now
;
4863 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4864 session
[i
].ip_pool_index
= ipid
;
4865 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
4870 // Fix the address pool to match a changed session.
4871 // (usually when the master sends us an update).
4872 static void fix_address_pool(int sid
)
4876 ipid
= session
[sid
].ip_pool_index
;
4878 if (ipid
> ip_pool_size
)
4879 return; // Ignore it. rebuild_address_pool will fix it up.
4881 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
4882 return; // Just ignore it. rebuild_address_pool will take care of it.
4884 ip_address_pool
[ipid
].assigned
= 1;
4885 ip_address_pool
[ipid
].session
= sid
;
4886 ip_address_pool
[ipid
].last
= time_now
;
4887 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4891 // Add a block of addresses to the IP pool to hand out.
4893 static void add_to_ip_pool(in_addr_t addr
, int prefixlen
)
4897 prefixlen
= 32; // Host route only.
4899 addr
&= 0xffffffff << (32 - prefixlen
);
4901 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
4904 for (i
= addr
; i
< addr
+(1<<(32-prefixlen
)); ++i
)
4906 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
4907 continue; // Skip 0 and broadcast addresses.
4909 ip_address_pool
[ip_pool_size
].address
= i
;
4910 ip_address_pool
[ip_pool_size
].assigned
= 0;
4912 if (ip_pool_size
>= MAXIPPOOL
)
4914 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
4920 // Initialize the IP address pool
4921 static void initippool()
4926 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
4928 if (!(f
= fopen(IPPOOLFILE
, "r")))
4930 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
4934 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
4937 buf
[4095] = 0; // Force it to be zero terminated/
4939 if (*buf
== '#' || *buf
== '\n')
4940 continue; // Skip comments / blank lines
4941 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
4942 if ((p
= (char *)strchr(buf
, ':')))
4946 src
= inet_addr(buf
);
4947 if (src
== INADDR_NONE
)
4949 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
4952 // This entry is for a specific IP only
4953 if (src
!= config
->bind_address
)
4958 if ((p
= (char *)strchr(pool
, '/')))
4962 in_addr_t start
= 0;
4964 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
4966 if (!*p
|| !(numbits
= atoi(p
)))
4968 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
4971 start
= ntohl(inet_addr(pool
));
4973 // Add a static route for this pool
4974 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4975 fmtaddr(htonl(start
), 0), numbits
);
4977 routeset(0, start
, numbits
, 0, 1);
4979 add_to_ip_pool(start
, numbits
);
4983 // It's a single ip address
4984 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
4988 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
4991 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
4993 struct sockaddr_in snoop_addr
= {0};
4994 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
4997 snoop_addr
.sin_family
= AF_INET
;
4998 snoop_addr
.sin_addr
.s_addr
= destination
;
4999 snoop_addr
.sin_port
= ntohs(port
);
5001 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size
,
5002 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
5003 htons(snoop_addr
.sin_port
));
5005 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
5006 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
5008 STAT(packets_snooped
);
5011 static int dump_session(FILE **f
, sessiont
*s
)
5013 if (!s
->opened
|| (!s
->ip
&& !s
->forwardtosession
) || !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
5018 char filename
[1024];
5020 time_t now
= time(NULL
);
5022 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
5023 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
5025 if (!(*f
= fopen(filename
, "w")))
5027 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
5031 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
5032 if(config
->account_all_origin
)
5034 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
5039 "# format: username ip qos uptxoctets downrxoctets origin(L=LAC, R=Remote LNS, P=PPPOE)\n",
5041 fmtaddr(config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] ? config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] : my_address
, 0),
5047 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
5052 "# format: username ip qos uptxoctets downrxoctets\n",
5054 fmtaddr(config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] ? config
->iftun_n_address
[tunnel
[s
->tunnel
].indexudp
] : my_address
, 0),
5060 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
5061 if(config
->account_all_origin
)
5063 fprintf(*f
, "%s %s %d %u %u %s\n",
5064 s
->user
, // username
5065 fmtaddr(htonl(s
->ip
), 0), // ip
5066 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
5067 (uint32_t) s
->cin_delta
, // uptxoctets
5068 (uint32_t) s
->cout_delta
, // downrxoctets
5069 (s
->tunnel
== TUNNEL_ID_PPPOE
)?"P":(tunnel
[s
->tunnel
].isremotelns
?"R":"L")); // Origin
5071 else if (!tunnel
[s
->tunnel
].isremotelns
&& (s
->tunnel
!= TUNNEL_ID_PPPOE
))
5073 fprintf(*f
, "%s %s %d %u %u\n",
5074 s
->user
, // username
5075 fmtaddr(htonl(s
->ip
), 0), // ip
5076 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
5077 (uint32_t) s
->cin_delta
, // uptxoctets
5078 (uint32_t) s
->cout_delta
); // downrxoctets
5081 s
->cin_delta
= s
->cout_delta
= 0;
5086 static void dump_acct_info(int all
)
5092 CSTAT(dump_acct_info
);
5096 for (i
= 0; i
< shut_acct_n
; i
++)
5097 dump_session(&f
, &shut_acct
[i
]);
5103 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5104 dump_session(&f
, &session
[i
]);
5111 int main(int argc
, char *argv
[])
5115 char *optconfig
= CONFIGFILE
;
5117 time(&basetime
); // start clock
5120 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
5125 if (fork()) exit(0);
5127 if(!freopen("/dev/null", "r", stdin
)) LOG(0, 0, 0, "Error freopen stdin: %s\n", strerror(errno
));
5128 if(!freopen("/dev/null", "w", stdout
)) LOG(0, 0, 0, "Error freopen stdout: %s\n", strerror(errno
));
5129 if(!freopen("/dev/null", "w", stderr
)) LOG(0, 0, 0, "Error freopen stderr: %s\n", strerror(errno
));
5138 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
5141 printf("Args are:\n"
5142 "\t-d\t\tDetach from terminal\n"
5143 "\t-c <file>\tConfig file\n"
5144 "\t-h <hostname>\tForce hostname\n"
5152 // Start the timer routine off
5154 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
5157 initdata(optdebug
, optconfig
);
5161 /* set hostname /after/ having read the config file */
5162 if (*config
->hostname
)
5163 strcpy(hostname
, config
->hostname
);
5164 cli_init_complete(hostname
);
5166 init_tbf(config
->num_tbfs
);
5168 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
5169 LOG(0, 0, 0, "Copyright (c) 2012, 2013, 2014 ISP FDN & SAMESWIRELESS\n");
5170 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5171 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5174 rlim
.rlim_cur
= RLIM_INFINITY
;
5175 rlim
.rlim_max
= RLIM_INFINITY
;
5176 // Remove the maximum core size
5177 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
5178 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
5180 // Make core dumps go to /tmp
5181 if(chdir("/tmp")) LOG(0, 0, 0, "Error chdir /tmp: %s\n", strerror(errno
));
5184 if (config
->scheduler_fifo
)
5187 struct sched_param params
= {0};
5188 params
.sched_priority
= 1;
5190 if (get_nprocs() < 2)
5192 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5193 config
->scheduler_fifo
= 0;
5197 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
5199 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5203 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
5204 config
->scheduler_fifo
= 0;
5211 /* Set up the cluster communications port. */
5212 if (cluster_init() < 0)
5216 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevicename
);
5218 if (*config
->pppoe_if_to_bind
)
5221 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config
->pppoe_if_to_bind
);
5224 if (!config
->nbmultiaddress
)
5226 config
->bind_n_address
[0] = config
->bind_address
;
5227 config
->nbmultiaddress
++;
5229 config
->nbudpfd
= config
->nbmultiaddress
;
5230 for (i
= 0; i
< config
->nbudpfd
; i
++)
5231 initudp(&udpfd
[i
], config
->bind_n_address
[i
]);
5233 config
->indexlacudpfd
= config
->nbudpfd
;
5234 udpfd
[config
->indexlacudpfd
] = udplacfd
;
5241 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
5249 unsigned seed
= time_now
^ getpid();
5250 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
5254 signal(SIGHUP
, sighup_handler
);
5255 signal(SIGCHLD
, sigchild_handler
);
5256 signal(SIGTERM
, shutdown_handler
);
5257 signal(SIGINT
, shutdown_handler
);
5258 signal(SIGQUIT
, shutdown_handler
);
5260 // Prevent us from getting paged out
5261 if (config
->lock_pages
)
5263 if (!mlockall(MCL_CURRENT
))
5264 LOG(1, 0, 0, "Locking pages into memory\n");
5266 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
5269 //LOG(3, 0, 0, "Debug sizeof struct: sessiont %lu, tunnelt %lu, bundlet %lu, groupsesst %lu\n",
5270 // sizeof(sessiont), sizeof(tunnelt), sizeof(bundlet), sizeof(groupsesst));
5274 /* remove plugins (so cleanup code gets run) */
5277 // Remove the PID file if we wrote it
5278 if (config
->wrote_pid
&& *config
->pid_file
== '/')
5279 unlink(config
->pid_file
);
5281 /* kill CLI children */
5282 signal(SIGTERM
, SIG_IGN
);
5287 static void sighup_handler(int sig
)
5292 static void shutdown_handler(int sig
)
5294 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
5297 static void sigchild_handler(int sig
)
5299 while (waitpid(-1, NULL
, WNOHANG
) > 0)
5303 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
5306 *challenge_response
= NULL
;
5308 if (!*config
->l2tp_secret
)
5310 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5314 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5316 *challenge_response
= calloc(17, 1);
5319 MD5_Update(&ctx
, &id
, 1);
5320 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5321 MD5_Update(&ctx
, challenge
, challenge_length
);
5322 MD5_Final(*challenge_response
, &ctx
);
5327 static int facility_value(char *name
)
5330 for (i
= 0; facilitynames
[i
].c_name
; i
++)
5332 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
5333 return facilitynames
[i
].c_val
;
5338 static void update_config()
5342 static int timeout
= 0;
5343 static int interval
= 0;
5350 if (log_stream
!= stderr
)
5356 if (*config
->log_filename
)
5358 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
5360 char *p
= config
->log_filename
+ 7;
5363 openlog("l2tpns", LOG_PID
, facility_value(p
));
5367 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
5369 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
5371 fseek(log_stream
, 0, SEEK_END
);
5372 setbuf(log_stream
, NULL
);
5376 log_stream
= stderr
;
5377 setbuf(log_stream
, NULL
);
5383 log_stream
= stderr
;
5384 setbuf(log_stream
, NULL
);
5387 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5388 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5390 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
5391 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
5392 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
5394 // reset MRU/MSS globals
5395 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
5396 if (MRU
> PPPoE_MRU
)
5399 MSS
= MRU
- TCP_HDRS
;
5402 config
->numradiusservers
= 0;
5403 for (i
= 0; i
< MAXRADSERVER
; i
++)
5404 if (config
->radiusserver
[i
])
5406 config
->numradiusservers
++;
5407 // Set radius port: if not set, take the port from the
5408 // first radius server. For the first radius server,
5409 // take the #defined default value from l2tpns.h
5411 // test twice, In case someone works with
5412 // a secondary radius server without defining
5413 // a primary one, this will work even then.
5414 if (i
> 0 && !config
->radiusport
[i
])
5415 config
->radiusport
[i
] = config
->radiusport
[i
-1];
5416 if (!config
->radiusport
[i
])
5417 config
->radiusport
[i
] = RADPORT
;
5420 if (!config
->numradiusservers
)
5421 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5423 // parse radius_authtypes_s
5424 config
->radius_authtypes
= config
->radius_authprefer
= 0;
5425 p
= config
->radius_authtypes_s
;
5428 char *s
= strpbrk(p
, " \t,");
5434 while (*s
== ' ' || *s
== '\t')
5441 if (!strncasecmp("chap", p
, strlen(p
)))
5443 else if (!strncasecmp("pap", p
, strlen(p
)))
5446 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
5448 config
->radius_authtypes
|= type
;
5449 if (!config
->radius_authprefer
)
5450 config
->radius_authprefer
= type
;
5455 if (!config
->radius_authtypes
)
5457 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5458 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
5461 // normalise radius_authtypes_s
5462 if (config
->radius_authprefer
== AUTHPAP
)
5464 strcpy(config
->radius_authtypes_s
, "pap");
5465 if (config
->radius_authtypes
& AUTHCHAP
)
5466 strcat(config
->radius_authtypes_s
, ", chap");
5470 strcpy(config
->radius_authtypes_s
, "chap");
5471 if (config
->radius_authtypes
& AUTHPAP
)
5472 strcat(config
->radius_authtypes_s
, ", pap");
5475 if (!config
->radius_dae_port
)
5476 config
->radius_dae_port
= DAEPORT
;
5478 if(!config
->bind_portremotelns
)
5479 config
->bind_portremotelns
= L2TPLACPORT
;
5480 if(!config
->bind_address_remotelns
)
5481 config
->bind_address_remotelns
= INADDR_ANY
;
5483 if (*config
->bind_multi_address
)
5485 char *sip
= config
->bind_multi_address
;
5487 char *e
= config
->bind_multi_address
+ strlen(config
->bind_multi_address
);
5488 config
->nbmultiaddress
= 0;
5490 while (*sip
&& (sip
< e
))
5495 while (n
< e
&& (*n
== ',' || *n
== ' ')) n
++;
5497 while (n
< e
&& (isdigit(*n
) || *n
== '.'))
5505 u
= u
* 10 + *n
- '0';
5513 config
->bind_n_address
[config
->nbmultiaddress
] = htonl(ip
);
5514 config
->iftun_n_address
[config
->nbmultiaddress
] = htonl(ip
);
5515 config
->nbmultiaddress
++;
5516 LOG(1, 0, 0, "Bind address %s\n", fmtaddr(htonl(ip
), 0));
5518 if (config
->nbmultiaddress
>= MAX_BINDADDR
) break;
5524 if (config
->nbmultiaddress
>= 1)
5526 config
->bind_address
= config
->bind_n_address
[0];
5527 config
->iftun_address
= config
->bind_address
;
5531 if(!config
->iftun_address
)
5533 config
->iftun_address
= config
->bind_address
;
5534 config
->iftun_n_address
[0] = config
->iftun_address
;
5537 if (*config
->multi_hostname
)
5539 char *shost
= config
->multi_hostname
;
5541 char *e
= config
->multi_hostname
+ strlen(config
->multi_hostname
);
5542 config
->nbmultihostname
= 0;
5544 while (*shost
&& (shost
< e
))
5546 while ((n
< e
) && (*n
== ' ' || *n
== ',' || *n
== '\t')) n
++;
5549 while (n
< e
&& (*n
!= ',') && (*n
!= '\t'))
5551 config
->multi_n_hostname
[config
->nbmultihostname
][i
] = *n
;
5557 config
->multi_n_hostname
[config
->nbmultihostname
][i
] = 0;
5558 LOG(1, 0, 0, "Bind Hostname %s\n", config
->multi_n_hostname
[config
->nbmultihostname
]);
5559 config
->nbmultihostname
++;
5560 if (config
->nbmultihostname
>= MAX_NBHOSTNAME
) break;
5566 if (config
->nbmultihostname
>= 1)
5568 strcpy(hostname
, config
->multi_n_hostname
[0]);
5569 strcpy(config
->hostname
, hostname
);
5573 if (!*config
->pppoe_ac_name
)
5574 strncpy(config
->pppoe_ac_name
, DEFAULT_PPPOE_AC_NAME
, sizeof(config
->pppoe_ac_name
) - 1);
5576 // re-initialise the random number source
5577 initrandom(config
->random_device
);
5580 for (i
= 0; i
< MAXPLUGINS
; i
++)
5582 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
5585 if (*config
->plugins
[i
])
5588 add_plugin(config
->plugins
[i
]);
5590 else if (*config
->old_plugins
[i
])
5593 remove_plugin(config
->old_plugins
[i
]);
5598 guest_accounts_num
= 0;
5599 char *p2
= config
->guest_user
;
5602 char *s
= strpbrk(p2
, " \t,");
5606 while (*s
== ' ' || *s
== '\t')
5613 strcpy(guest_users
[guest_accounts_num
], p2
);
5614 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num
, guest_users
[guest_accounts_num
]);
5615 guest_accounts_num
++;
5618 // Rebuild the guest_user array
5619 strcpy(config
->guest_user
, "");
5621 for (ui
=0; ui
<guest_accounts_num
; ui
++)
5623 strcat(config
->guest_user
, guest_users
[ui
]);
5624 if (ui
<guest_accounts_num
-1)
5626 strcat(config
->guest_user
, ",");
5631 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
5632 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
5633 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
5634 if (!*config
->cluster_interface
)
5635 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
5637 if (!config
->cluster_hb_interval
)
5638 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
5640 if (!config
->cluster_hb_timeout
)
5641 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
5643 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
5645 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5646 // late, ensure we're sufficiently larger than that
5647 int t
= 4 * config
->cluster_hb_interval
+ 11;
5649 if (config
->cluster_hb_timeout
< t
)
5651 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
5652 config
->cluster_hb_timeout
= t
;
5655 // Push timing changes to the slaves immediately if we're the master
5656 if (config
->cluster_iam_master
)
5657 cluster_heartbeat();
5659 interval
= config
->cluster_hb_interval
;
5660 timeout
= config
->cluster_hb_timeout
;
5664 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
5667 if ((f
= fopen(config
->pid_file
, "w")))
5669 fprintf(f
, "%d\n", getpid());
5671 config
->wrote_pid
= 1;
5675 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
5680 static void read_config_file()
5684 if (!config
->config_file
) return;
5685 if (!(f
= fopen(config
->config_file
, "r")))
5687 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
5691 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
5693 LOG(3, 0, 0, "Done reading config file\n");
5697 int sessionsetup(sessionidt s
, tunnelidt t
)
5699 // A session now exists, set it up
5705 CSTAT(sessionsetup
);
5707 LOG(3, s
, t
, "Doing session setup for session\n");
5709 // Join a bundle if the MRRU option is accepted
5710 if(session
[s
].mrru
> 0 && session
[s
].bundle
== 0)
5712 LOG(3, s
, t
, "This session can be part of multilink bundle\n");
5713 if (join_bundle(s
) > 0)
5714 cluster_send_bundle(session
[s
].bundle
);
5717 LOG(0, s
, t
, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5718 sessionshutdown(s
, "Mismaching mssf option.", CDN_NONE
, TERM_SERVICE_UNAVAILABLE
);
5725 assign_ip_address(s
);
5728 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
5729 sessionshutdown(s
, "No IP addresses available.", CDN_TRY_ANOTHER
, TERM_SERVICE_UNAVAILABLE
);
5732 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
5733 fmtaddr(htonl(session
[s
].ip
), 0));
5736 // Make sure this is right
5737 session
[s
].tunnel
= t
;
5739 // zap old sessions with same IP and/or username
5740 // Don't kill gardened sessions - doing so leads to a DoS
5741 // from someone who doesn't need to know the password
5744 user
= session
[s
].user
;
5745 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5747 if (i
== s
) continue;
5748 if (!session
[s
].opened
) break;
5749 // Allow duplicate sessions for multilink ones of the same bundle.
5750 if (session
[s
].bundle
&& session
[i
].bundle
&& session
[s
].bundle
== session
[i
].bundle
) continue;
5752 if (ip
== session
[i
].ip
)
5754 sessionshutdown(i
, "Duplicate IP address", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5758 if (config
->allow_duplicate_users
) continue;
5759 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
5763 for (gu
= 0; gu
< guest_accounts_num
; gu
++)
5765 if (!strcasecmp(user
, guest_users
[gu
]))
5771 if (found
) continue;
5773 // Drop the new session in case of duplicate sessionss, not the old one.
5774 if (!strcasecmp(user
, session
[i
].user
))
5775 sessionshutdown(i
, "Duplicate session for users", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5779 // no need to set a route for the same IP address of the bundle
5780 if (!session
[s
].bundle
|| (bundle
[session
[s
].bundle
].num_of_links
== 1))
5785 // Add the route for this session.
5786 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
5788 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
5789 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
5792 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 1);
5795 // Static IPs need to be routed if not already
5796 // convered by a Framed-Route. Anything else is part
5797 // of the IP address pool and is already routed, it
5798 // just needs to be added to the IP cache.
5799 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5800 if (session
[s
].ip_pool_index
== -1) // static ip
5802 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
5805 cache_ipmap(session
[s
].ip
, s
);
5807 if ((g
= grp_groupbysession(s
)))
5809 grp_setgrouproute(g
, 1);
5810 cluster_send_groupe(g
);
5814 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
5815 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
5817 // Run the plugin's against this new session.
5819 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
5820 run_plugins(PLUGIN_NEW_SESSION
, &data
);
5823 // Allocate TBFs if throttled
5824 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
5825 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
5827 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
5829 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
5830 fmtaddr(htonl(session
[s
].ip
), 0),
5831 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
5833 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
5835 return 1; // RADIUS OK and IP allocated, done...
5839 // This session just got dropped on us by the master or something.
5840 // Make sure our tables up up to date...
5842 int load_session(sessionidt s
, sessiont
*new)
5848 if (new->ip_pool_index
>= MAXIPPOOL
||
5849 new->tunnel
>= MAXTUNNEL
)
5851 LOG(0, s
, 0, "Strange session update received!\n");
5852 // FIXME! What to do here?
5857 // Ok. All sanity checks passed. Now we're committed to
5858 // loading the new session.
5861 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
5863 // See if routes/ip cache need updating
5864 if (new->ip
!= session
[s
].ip
)
5867 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
5868 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
5869 new->route
[i
].prefixlen
!= session
[s
].route
[i
].prefixlen
)
5877 // remove old routes...
5878 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
5880 if ((session
[s
].ip
>> (32-session
[s
].route
[i
].prefixlen
)) ==
5881 (session
[s
].route
[i
].ip
>> (32-session
[s
].route
[i
].prefixlen
)))
5884 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].prefixlen
, 0, 0);
5890 if (session
[s
].ip_pool_index
== -1) // static IP
5892 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
5894 else // It's part of the IP pool, remove it manually.
5895 uncache_ipmap(session
[s
].ip
);
5898 // remove old IPV6 routes...
5899 if (session
[s
].ipv6route
.s6_addr
[0] && session
[s
].ipv6prefixlen
)
5900 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
5902 if (session
[s
].ipv6address
.s6_addr
[0])
5904 route6set(s
, session
[s
].ipv6address
, 128, 0);
5909 // add new routes...
5910 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
5912 if ((new->ip
>> (32-new->route
[i
].prefixlen
)) ==
5913 (new->route
[i
].ip
>> (32-new->route
[i
].prefixlen
)))
5916 routeset(s
, new->route
[i
].ip
, new->route
[i
].prefixlen
, 0, 1);
5922 // If there's a new one, add it.
5923 if (new->ip_pool_index
== -1)
5925 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
5928 cache_ipmap(new->ip
, s
);
5933 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5934 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
5936 if (new->ipv6address
.s6_addr
[0] && new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5938 // Check if included in prefix
5939 if (sessionbyipv6(new->ipv6address
) != s
)
5940 route6set(s
, new->ipv6address
, 128, 1);
5944 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
5946 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %u\n", (int) new->filter_in
);
5950 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
5952 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %u\n", (int) new->filter_out
);
5953 new->filter_out
= 0;
5956 if (new->filter_in
!= session
[s
].filter_in
)
5958 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
5959 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
5962 if (new->filter_out
!= session
[s
].filter_out
)
5964 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
5965 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
5968 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
5969 // for walking the sessions to forward byte counts to the master.
5970 config
->cluster_highest_sessionid
= s
;
5972 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
5974 // Do fixups into address pool.
5975 if (new->ip_pool_index
!= -1)
5976 fix_address_pool(s
);
5981 static void initplugins()
5985 loaded_plugins
= ll_init();
5986 // Initialize the plugins to nothing
5987 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
5988 plugins
[i
] = ll_init();
5991 static void *open_plugin(char *plugin_name
, int load
)
5993 char path
[256] = "";
5995 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
5996 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
5997 return dlopen(path
, RTLD_NOW
);
6000 // plugin callback to get a config value
6001 static void *getconfig(char *key
, enum config_typet type
)
6005 for (i
= 0; config_values
[i
].key
; i
++)
6007 if (!strcmp(config_values
[i
].key
, key
))
6009 if (config_values
[i
].type
== type
)
6010 return ((void *) config
) + config_values
[i
].offset
;
6012 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
6013 key
, type
, config_values
[i
].type
);
6019 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
6023 static int add_plugin(char *plugin_name
)
6025 static struct pluginfuncs funcs
= {
6030 sessiontbysessionidt
,
6031 sessionidtbysessiont
,
6038 cluster_send_session
,
6041 void *p
= open_plugin(plugin_name
, 1);
6042 int (*initfunc
)(struct pluginfuncs
*);
6047 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
6051 if (ll_contains(loaded_plugins
, p
))
6054 return 0; // already loaded
6058 int *v
= dlsym(p
, "plugin_api_version");
6059 if (!v
|| *v
!= PLUGIN_API_VERSION
)
6061 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
6067 if ((initfunc
= dlsym(p
, "plugin_init")))
6069 if (!initfunc(&funcs
))
6071 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
6077 ll_push(loaded_plugins
, p
);
6079 for (i
= 0; i
< max_plugin_functions
; i
++)
6082 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
6084 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
6085 ll_push(plugins
[i
], x
);
6089 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
6093 static void run_plugin_done(void *plugin
)
6095 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
6101 static int remove_plugin(char *plugin_name
)
6103 void *p
= open_plugin(plugin_name
, 0);
6109 if (ll_contains(loaded_plugins
, p
))
6112 for (i
= 0; i
< max_plugin_functions
; i
++)
6115 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
6116 ll_delete(plugins
[i
], x
);
6119 ll_delete(loaded_plugins
, p
);
6125 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
6129 int run_plugins(int plugin_type
, void *data
)
6131 int (*func
)(void *data
);
6133 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
6134 return PLUGIN_RET_ERROR
;
6136 ll_reset(plugins
[plugin_type
]);
6137 while ((func
= ll_next(plugins
[plugin_type
])))
6141 if (r
!= PLUGIN_RET_OK
)
6142 return r
; // stop here
6145 return PLUGIN_RET_OK
;
6148 static void plugins_done()
6152 ll_reset(loaded_plugins
);
6153 while ((p
= ll_next(loaded_plugins
)))
6157 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
6159 struct nsctl request
;
6160 struct nsctl response
;
6161 int type
= unpack_control(&request
, buf
, len
);
6165 if (log_stream
&& config
->debug
>= 4)
6169 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
6170 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
6174 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
6175 dump_control(&request
, log_stream
);
6181 case NSCTL_REQ_LOAD
:
6182 if (request
.argc
!= 1)
6184 response
.type
= NSCTL_RES_ERR
;
6186 response
.argv
[0] = "name of plugin required";
6188 else if ((r
= add_plugin(request
.argv
[0])) < 1)
6190 response
.type
= NSCTL_RES_ERR
;
6192 response
.argv
[0] = !r
6193 ? "plugin already loaded"
6194 : "error loading plugin";
6198 response
.type
= NSCTL_RES_OK
;
6204 case NSCTL_REQ_UNLOAD
:
6205 if (request
.argc
!= 1)
6207 response
.type
= NSCTL_RES_ERR
;
6209 response
.argv
[0] = "name of plugin required";
6211 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
6213 response
.type
= NSCTL_RES_ERR
;
6215 response
.argv
[0] = !r
6216 ? "plugin not loaded"
6217 : "plugin not found";
6221 response
.type
= NSCTL_RES_OK
;
6227 case NSCTL_REQ_HELP
:
6228 response
.type
= NSCTL_RES_OK
;
6231 ll_reset(loaded_plugins
);
6232 while ((p
= ll_next(loaded_plugins
)))
6234 char **help
= dlsym(p
, "plugin_control_help");
6235 while (response
.argc
< 0xff && help
&& *help
)
6236 response
.argv
[response
.argc
++] = *help
++;
6241 case NSCTL_REQ_CONTROL
:
6243 struct param_control param
= {
6244 config
->cluster_iam_master
,
6251 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
6253 if (r
== PLUGIN_RET_ERROR
)
6255 response
.type
= NSCTL_RES_ERR
;
6257 response
.argv
[0] = param
.additional
6259 : "error returned by plugin";
6261 else if (r
== PLUGIN_RET_NOTMASTER
)
6263 static char msg
[] = "must be run on master: 000.000.000.000";
6265 response
.type
= NSCTL_RES_ERR
;
6267 if (config
->cluster_master_address
)
6269 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
6270 response
.argv
[0] = msg
;
6274 response
.argv
[0] = "must be run on master: none elected";
6277 else if (!(param
.response
& NSCTL_RESPONSE
))
6279 response
.type
= NSCTL_RES_ERR
;
6281 response
.argv
[0] = param
.response
6282 ? "unrecognised response value from plugin"
6283 : "unhandled action";
6287 response
.type
= param
.response
;
6289 if (param
.additional
)
6292 response
.argv
[0] = param
.additional
;
6300 response
.type
= NSCTL_RES_ERR
;
6302 response
.argv
[0] = "error unpacking control packet";
6305 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
6308 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6312 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
6315 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
6316 if (log_stream
&& config
->debug
>= 4)
6318 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
6319 dump_control(&response
, log_stream
);
6323 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6324 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
6329 static tunnelidt
new_tunnel()
6332 for (i
= 1; i
< MAXTUNNEL
; i
++)
6334 if ((tunnel
[i
].state
== TUNNELFREE
) && (i
!= TUNNEL_ID_PPPOE
))
6336 LOG(4, 0, i
, "Assigning tunnel ID %u\n", i
);
6337 if (i
> config
->cluster_highest_tunnelid
)
6338 config
->cluster_highest_tunnelid
= i
;
6342 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6347 // We're becoming the master. Do any required setup..
6349 // This is principally telling all the plugins that we're
6350 // now a master, and telling them about all the sessions
6351 // that are active too..
6353 void become_master(void)
6356 static struct event_data d
[RADIUS_FDS
];
6357 struct epoll_event e
;
6359 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
6361 // running a bunch of iptables commands is slow and can cause
6362 // the master to drop tunnels on takeover--kludge around the
6363 // problem by forking for the moment (note: race)
6364 if (!fork_and_close())
6366 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6368 if (!session
[s
].opened
) // Not an in-use session.
6371 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
6378 for (i
= 0; i
< RADIUS_FDS
; i
++)
6380 d
[i
].type
= FD_TYPE_RADIUS
;
6384 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
6388 int cmd_show_hist_idle(struct cli_def
*cli
, const char *command
, char **argv
, int argc
)
6394 if (CLI_HELP_REQUESTED
)
6395 return CLI_HELP_NO_ARGS
;
6398 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6400 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6403 if (!session
[s
].opened
)
6406 idle
= time_now
- session
[s
].last_data
;
6407 idle
/= 5 ; // In multiples of 5 seconds.
6417 for (i
= 0; i
< 63; ++i
)
6419 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6421 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
6422 cli_print(cli
, "%d total sessions open.", count
);
6426 int cmd_show_hist_open(struct cli_def
*cli
, const char *command
, char **argv
, int argc
)
6432 if (CLI_HELP_REQUESTED
)
6433 return CLI_HELP_NO_ARGS
;
6436 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6438 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6441 if (!session
[s
].opened
)
6444 d
= time_now
- session
[s
].opened
;
6447 while (d
> 1 && open
< 32)
6457 for (i
= 0; i
< 30; ++i
)
6459 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6462 cli_print(cli
, "%d total sessions open.", count
);
6468 * This unencodes the AVP using the L2TP secret and the previously
6469 * stored random vector. It overwrites the hidden data with the
6470 * unhidden AVP subformat.
6472 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
6478 uint16_t m
= htons(type
);
6480 // Compute initial pad
6482 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
6483 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6484 MD5_Update(&ctx
, vector
, vec_len
);
6485 MD5_Final(digest
, &ctx
);
6487 // pointer to last decoded 16 octets
6492 // calculate a new pad based on the last decoded block
6493 if (d
>= sizeof(digest
))
6496 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6497 MD5_Update(&ctx
, last
, sizeof(digest
));
6498 MD5_Final(digest
, &ctx
);
6504 *value
++ ^= digest
[d
++];
6509 int find_filter(char const *name
, size_t len
)
6514 for (i
= 0; i
< MAXFILTER
; i
++)
6516 if (!*ip_filters
[i
].name
)
6524 if (strlen(ip_filters
[i
].name
) != len
)
6527 if (!strncmp(ip_filters
[i
].name
, name
, len
))
6534 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
6538 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
6539 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
6540 case FILTER_PORT_OP_GT
: return port
> p
->port
;
6541 case FILTER_PORT_OP_LT
: return port
< p
->port
;
6542 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
6548 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
6552 case FILTER_FLAG_OP_ANY
:
6553 return (flags
& sflags
) || (~flags
& cflags
);
6555 case FILTER_FLAG_OP_ALL
:
6556 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
6558 case FILTER_FLAG_OP_EST
:
6559 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
6565 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
6567 uint16_t frag_offset
;
6571 uint16_t src_port
= 0;
6572 uint16_t dst_port
= 0;
6574 ip_filter_rulet
*rule
;
6576 if (len
< 20) // up to end of destination address
6579 if ((*buf
>> 4) != 4) // IPv4
6582 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
6584 src_ip
= *(in_addr_t
*) (buf
+ 12);
6585 dst_ip
= *(in_addr_t
*) (buf
+ 16);
6587 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
6589 int l
= (buf
[0] & 0xf) * 4; // length of IP header
6590 if (len
< l
+ 4) // ports
6593 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
6594 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
6595 if (proto
== IPPROTO_TCP
)
6597 if (len
< l
+ 14) // flags
6600 flags
= buf
[l
+ 13] & 0x3f;
6604 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
6606 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
6609 if (rule
->src_wild
!= INADDR_BROADCAST
&&
6610 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
6613 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
6614 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
6619 // layer 4 deny rules are skipped
6620 if (rule
->action
== FILTER_ACTION_DENY
&&
6621 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
6629 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
6631 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
6634 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
6637 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
6638 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
6645 return rule
->action
== FILTER_ACTION_PERMIT
;
6652 tunnelidt
lac_new_tunnel()
6654 return new_tunnel();
6657 void lac_tunnelclear(tunnelidt t
)
6662 void lac_send_SCCRQ(tunnelidt t
, uint8_t * auth
, unsigned int auth_len
)
6664 uint16_t version
= 0x0100; // protocol version
6666 tunnel
[t
].state
= TUNNELOPENING
;
6668 // Sent SCCRQ - Start Control Connection Request
6669 controlt
*c
= controlnew(1); // sending SCCRQ
6670 controls(c
, 7, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
, 1); // host name
6671 controls(c
, 8, Vendor_name
, 1); // Vendor name
6672 control16(c
, 2, version
, 1); // protocol version
6673 control32(c
, 3, 3, 1); // framing Capabilities
6674 control16(c
, 9, t
, 1); // assigned tunnel
6675 controlb(c
, 11, (uint8_t *) auth
, auth_len
, 1); // CHAP Challenge
6676 LOG(3, 0, t
, "Sent SCCRQ to REMOTE LNS\n");
6677 controladd(c
, 0, t
); // send
6680 void lac_send_ICRQ(tunnelidt t
, sessionidt s
)
6682 // Sent ICRQ Incoming-call-request
6683 controlt
*c
= controlnew(10); // ICRQ
6685 control16(c
, 14, s
, 1); // assigned sesion
6686 call_serial_number
++;
6687 control32(c
, 15, call_serial_number
, 1); // call serial number
6688 LOG(3, s
, t
, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel
[t
].far
);
6689 controladd(c
, 0, t
); // send
6692 void lac_tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
6694 tunnelshutdown(t
, reason
, result
, error
, msg
);