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>
15 #include <net/route.h>
18 #include <netinet/in.h>
19 #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>
47 #include "constants.h"
62 char * Vendor_name
= "Linux L2TPNS";
63 uint32_t call_serial_number
= 0;
67 configt
*config
= NULL
; // all configuration
68 int nlfd
= -1; // netlink socket
69 int tunfd
= -1; // tun interface file handle. (network device)
70 int udpfd
= -1; // UDP file handle
72 int udplacfd
= -1; // UDP LAC file handle
74 int controlfd
= -1; // Control signal handle
75 int clifd
= -1; // Socket listening for CLI connections.
76 int daefd
= -1; // Socket listening for DAE connections.
77 int snoopfd
= -1; // UDP file handle for sending out intercept data
78 int *radfds
= NULL
; // RADIUS requests file handles
79 int rand_fd
= -1; // Random data source
80 int cluster_sockfd
= -1; // Intra-cluster communications socket.
81 int epollfd
= -1; // event polling
82 time_t basetime
= 0; // base clock
83 char hostname
[MAXHOSTNAME
] = ""; // us.
84 static int tunidx
; // ifr_ifindex of tun device
85 int nlseqnum
= 0; // netlink sequence number
86 int min_initok_nlseqnum
= 0; // minimun seq number for messages after init is ok
87 static int syslog_log
= 0; // are we logging to syslog
88 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
89 uint32_t last_id
= 0; // Unique ID for radius accounting
91 char guest_users
[10][32]; // Array of guest users
92 int guest_accounts_num
= 0; // Number of guest users
94 // calculated from config->l2tp_mtu
95 uint16_t MRU
= 0; // PPP MRU
96 uint16_t MSS
= 0; // TCP MSS
98 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
99 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
104 } ip_hash
[256]; // Mapping from IP address to session structures.
108 struct ipv6radix
*branch
;
109 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
112 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
113 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
116 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
117 time_t time_now
= 0; // Current time in seconds since epoch.
118 uint64_t time_now_ms
= 0; // Current time in milliseconds since epoch.
119 static char time_now_string
[64] = {0}; // Current time as a string.
120 static int time_changed
= 0; // time_now changed
121 char main_quit
= 0; // True if we're in the process of exiting.
122 static char main_reload
= 0; // Re-load pending
123 linked_list
*loaded_plugins
;
124 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
126 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
127 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
129 config_descriptt config_values
[] = {
130 CONFIG("debug", debug
, INT
),
131 CONFIG("log_file", log_filename
, STRING
),
132 CONFIG("pid_file", pid_file
, STRING
),
133 CONFIG("random_device", random_device
, STRING
),
134 CONFIG("l2tp_secret", l2tp_secret
, STRING
),
135 CONFIG("l2tp_mtu", l2tp_mtu
, INT
),
136 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
137 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
138 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
139 CONFIG("primary_dns", default_dns1
, IPv4
),
140 CONFIG("secondary_dns", default_dns2
, IPv4
),
141 CONFIG("primary_radius", radiusserver
[0], IPv4
),
142 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
143 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
144 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
145 CONFIG("radius_accounting", radius_accounting
, BOOL
),
146 CONFIG("radius_interim", radius_interim
, INT
),
147 CONFIG("radius_secret", radiussecret
, STRING
),
148 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
149 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
150 CONFIG("radius_bind_min", radius_bind_min
, SHORT
),
151 CONFIG("radius_bind_max", radius_bind_max
, SHORT
),
152 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
153 CONFIG("kill_timedout_sessions", kill_timedout_sessions
, BOOL
),
154 CONFIG("guest_account", guest_user
, STRING
),
155 CONFIG("bind_address", bind_address
, IPv4
),
156 CONFIG("peer_address", peer_address
, IPv4
),
157 CONFIG("send_garp", send_garp
, BOOL
),
158 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
159 CONFIG("throttle_buckets", num_tbfs
, INT
),
160 CONFIG("accounting_dir", accounting_dir
, STRING
),
161 CONFIG("dump_speed", dump_speed
, BOOL
),
162 CONFIG("multi_read_count", multi_read_count
, INT
),
163 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
164 CONFIG("lock_pages", lock_pages
, BOOL
),
165 CONFIG("icmp_rate", icmp_rate
, INT
),
166 CONFIG("packet_limit", max_packets
, INT
),
167 CONFIG("cluster_address", cluster_address
, IPv4
),
168 CONFIG("cluster_interface", cluster_interface
, STRING
),
169 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl
, INT
),
170 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
171 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
172 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
173 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
174 CONFIG("cli_bind_address", cli_bind_address
, IPv4
),
175 CONFIG("hostname", hostname
, STRING
),
177 CONFIG("nexthop_address", nexthop_address
, IPv4
),
178 CONFIG("nexthop6_address", nexthop6_address
, IPv6
),
180 CONFIG("echo_timeout", echo_timeout
, INT
),
181 CONFIG("idle_echo_timeout", idle_echo_timeout
, INT
),
182 CONFIG("iftun_address", iftun_address
, IPv4
),
183 CONFIG("tundevicename", tundevicename
, STRING
),
185 CONFIG("disable_lac_func", disable_lac_func
, BOOL
),
186 CONFIG("auth_tunnel_change_addr_src", auth_tunnel_change_addr_src
, BOOL
),
187 CONFIG("bind_address_remotelns", bind_address_remotelns
, IPv4
),
188 CONFIG("bind_portremotelns", bind_portremotelns
, SHORT
),
190 CONFIG("pppoe_if_to_bind", pppoe_if_to_bind
, STRING
),
191 CONFIG("pppoe_service_name", pppoe_service_name
, STRING
),
192 CONFIG("pppoe_ac_name", pppoe_ac_name
, STRING
),
193 CONFIG("disable_sending_hello", disable_sending_hello
, BOOL
),
194 CONFIG("disable_no_spoof", disable_no_spoof
, BOOL
),
198 static char *plugin_functions
[] = {
203 "plugin_new_session",
204 "plugin_kill_session",
206 "plugin_radius_response",
207 "plugin_radius_reset",
208 "plugin_radius_account",
209 "plugin_become_master",
210 "plugin_new_session_master",
213 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
215 // Counters for shutdown sessions
216 static sessiont shut_acct
[8192];
217 static sessionidt shut_acct_n
= 0;
219 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
220 bundlet
*bundle
= NULL
; // Array of bundle structures.
221 fragmentationt
*frag
= NULL
; // Array of fragmentation structures.
222 sessiont
*session
= NULL
; // Array of session structures.
223 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
224 radiust
*radius
= NULL
; // Array of radius structures.
225 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
226 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
227 static controlt
*controlfree
= 0;
228 struct Tstats
*_statistics
= NULL
;
230 struct Tringbuffer
*ringbuffer
= NULL
;
233 static ssize_t
netlink_send(struct nlmsghdr
*nh
);
234 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
);
235 static void cache_ipmap(in_addr_t ip
, sessionidt s
);
236 static void uncache_ipmap(in_addr_t ip
);
237 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
);
238 static void free_ip_address(sessionidt s
);
239 static void dump_acct_info(int all
);
240 static void sighup_handler(int sig
);
241 static void shutdown_handler(int sig
);
242 static void sigchild_handler(int sig
);
243 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
244 static void update_config(void);
245 static void read_config_file(void);
246 static void initplugins(void);
247 static int add_plugin(char *plugin_name
);
248 static int remove_plugin(char *plugin_name
);
249 static void plugins_done(void);
250 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
);
251 static tunnelidt
new_tunnel(void);
252 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
253 static void bundleclear(bundleidt b
);
255 // return internal time (10ths since process startup), set f if given
256 // as a side-effect sets time_now, and time_changed
257 static clockt
now(double *f
)
261 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
262 if (t
.tv_sec
!= time_now
)
268 // Time in milliseconds
269 // TODO FOR MLPPP DEV
270 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
272 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
275 // work out a retry time based on try number
276 // This is a straight bounded exponential backoff.
277 // Maximum re-try time is 32 seconds. (2^5).
278 clockt
backoff(uint8_t try)
280 if (try > 5) try = 5; // max backoff
281 return now(NULL
) + 10 * (1 << try);
286 // Log a debug message. Typically called via the LOG macro
288 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
290 static char message
[65536] = {0};
296 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
297 ringbuffer
->tail
= 0;
298 if (ringbuffer
->tail
== ringbuffer
->head
)
299 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
300 ringbuffer
->head
= 0;
302 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
303 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
304 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
305 va_start(ap
, format
);
306 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, MAX_LOG_LENGTH
, format
, ap
);
311 if (config
->debug
< level
) return;
313 va_start(ap
, format
);
314 vsnprintf(message
, sizeof(message
), format
, ap
);
317 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
319 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
324 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
327 const uint8_t *d
= data
;
329 if (config
->debug
< level
) return;
331 // No support for _log_hex to syslog
334 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
335 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
337 for (i
= 0; i
< maxsize
; )
339 fprintf(log_stream
, "%4X: ", i
);
340 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
342 fprintf(log_stream
, "%02X ", d
[j
]);
344 fputs(": ", log_stream
);
347 for (; j
< i
+ 16; j
++)
349 fputs(" ", log_stream
);
351 fputs(": ", log_stream
);
354 fputs(" ", log_stream
);
355 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
357 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
358 fputc(d
[j
], log_stream
);
360 fputc('.', log_stream
);
363 fputs(" ", log_stream
);
367 fputs("\n", log_stream
);
371 setbuf(log_stream
, NULL
);
375 // update a counter, accumulating 2^32 wraps
376 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
378 uint32_t new = *counter
+ delta
;
385 // initialise the random generator
386 static void initrandom(char *source
)
388 static char path
[sizeof(config
->random_device
)] = "*undefined*";
390 // reinitialise only if we are forced to do so or if the config has changed
391 if (source
&& !strncmp(path
, source
, sizeof(path
)))
394 // close previous source, if any
403 snprintf(path
, sizeof(path
), "%s", source
);
407 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
409 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
410 path
, strerror(errno
));
415 // fill buffer with random data
416 void random_data(uint8_t *buf
, int len
)
423 n
= read(rand_fd
, buf
, len
);
424 if (n
>= len
) return;
429 LOG(0, 0, 0, "Error reading from random source: %s\n",
432 // fall back to rand()
440 // append missing data
442 // not using the low order bits from the prng stream
443 buf
[n
++] = (rand() >> 4) & 0xff;
448 // This adds it to the routing table, advertises it
449 // via BGP if enabled, and stuffs it into the
450 // 'sessionbyip' cache.
452 // 'ip' must be in _host_ order.
454 static void routeset(sessionidt s
, in_addr_t ip
, int prefixlen
, in_addr_t gw
, int add
)
464 if (!prefixlen
) prefixlen
= 32;
466 ip
&= 0xffffffff << (32 - prefixlen
);; // Force the ip to be the first one in the route.
468 memset(&req
, 0, sizeof(req
));
472 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
473 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
477 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
478 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
481 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
483 req
.rt
.rtm_family
= AF_INET
;
484 req
.rt
.rtm_dst_len
= prefixlen
;
485 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
486 req
.rt
.rtm_protocol
= 42;
487 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
488 req
.rt
.rtm_type
= RTN_UNICAST
;
490 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
492 netlink_addattr(&req
.nh
, RTA_DST
, &n_ip
, sizeof(n_ip
));
496 netlink_addattr(&req
.nh
, RTA_GATEWAY
, &n_ip
, sizeof(n_ip
));
499 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d%s%s\n", add
? "add" : "del",
500 fmtaddr(htonl(ip
), 0), prefixlen
,
501 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
503 if (netlink_send(&req
.nh
) < 0)
504 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno
));
508 bgp_add_route(htonl(ip
), prefixlen
);
510 bgp_del_route(htonl(ip
), prefixlen
);
513 // Add/Remove the IPs to the 'sessionbyip' cache.
514 // Note that we add the zero address in the case of
515 // a network route. Roll on CIDR.
517 // Note that 's == 0' implies this is the address pool.
518 // We still cache it here, because it will pre-fill
519 // the malloc'ed tree.
523 if (!add
) // Are we deleting a route?
524 s
= 0; // Caching the session as '0' is the same as uncaching.
526 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
531 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
539 char ipv6addr
[INET6_ADDRSTRLEN
];
541 if (!config
->ipv6_prefix
.s6_addr
[0])
543 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
547 memset(&req
, 0, sizeof(req
));
551 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
552 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
556 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
557 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
560 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
562 req
.rt
.rtm_family
= AF_INET6
;
563 req
.rt
.rtm_dst_len
= prefixlen
;
564 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
565 req
.rt
.rtm_protocol
= 42;
566 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
567 req
.rt
.rtm_type
= RTN_UNICAST
;
569 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
570 netlink_addattr(&req
.nh
, RTA_DST
, &ip
, sizeof(ip
));
572 netlink_addattr(&req
.nh
, RTA_METRICS
, &metric
, sizeof(metric
));
574 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d\n",
576 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
579 if (netlink_send(&req
.nh
) < 0)
580 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno
));
584 bgp_add_route6(ip
, prefixlen
);
586 bgp_del_route6(ip
, prefixlen
);
591 if (!add
) // Are we deleting a route?
592 s
= 0; // Caching the session as '0' is the same as uncaching.
594 cache_ipv6map(ip
, prefixlen
, s
);
601 // Set up netlink socket
602 static void initnetlink(void)
604 struct sockaddr_nl nladdr
;
606 nlfd
= socket(AF_NETLINK
, SOCK_RAW
, NETLINK_ROUTE
);
609 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno
));
613 memset(&nladdr
, 0, sizeof(nladdr
));
614 nladdr
.nl_family
= AF_NETLINK
;
615 nladdr
.nl_pid
= getpid();
617 if (bind(nlfd
, (struct sockaddr
*)&nladdr
, sizeof(nladdr
)) < 0)
619 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno
));
624 static ssize_t
netlink_send(struct nlmsghdr
*nh
)
626 struct sockaddr_nl nladdr
;
630 nh
->nlmsg_pid
= getpid();
631 nh
->nlmsg_seq
= ++nlseqnum
;
633 // set kernel address
634 memset(&nladdr
, 0, sizeof(nladdr
));
635 nladdr
.nl_family
= AF_NETLINK
;
637 iov
= (struct iovec
){ (void *)nh
, nh
->nlmsg_len
};
638 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
640 return sendmsg(nlfd
, &msg
, 0);
643 static ssize_t
netlink_recv(void *buf
, ssize_t len
)
645 struct sockaddr_nl nladdr
;
649 // set kernel address
650 memset(&nladdr
, 0, sizeof(nladdr
));
651 nladdr
.nl_family
= AF_NETLINK
;
653 iov
= (struct iovec
){ buf
, len
};
654 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
656 return recvmsg(nlfd
, &msg
, 0);
659 /* adapted from iproute2 */
660 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
)
662 int len
= RTA_LENGTH(alen
);
665 rta
= (struct rtattr
*)(((void *)nh
) + NLMSG_ALIGN(nh
->nlmsg_len
));
666 rta
->rta_type
= type
;
668 memcpy(RTA_DATA(rta
), data
, alen
);
669 nh
->nlmsg_len
= NLMSG_ALIGN(nh
->nlmsg_len
) + RTA_ALIGN(len
);
672 // messages corresponding to different phases seq number
673 static char *tun_nl_phase_msg
[] = {
675 "getting tun interface index",
676 "setting tun interface parameters",
677 "setting tun IPv4 address",
678 "setting tun LL IPv6 address",
679 "setting tun global IPv6 address",
683 // Set up TUN interface
684 static void inittun(void)
688 memset(&ifr
, 0, sizeof(ifr
));
689 ifr
.ifr_flags
= IFF_TUN
;
691 tunfd
= open(TUNDEVICE
, O_RDWR
);
694 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
698 int flags
= fcntl(tunfd
, F_GETFL
, 0);
699 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
702 if (*config
->tundevicename
)
703 strncpy(ifr
.ifr_name
, config
->tundevicename
, IFNAMSIZ
);
705 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
707 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
710 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevicename
) - 1);
711 strncpy(config
->tundevicename
, ifr
.ifr_name
, sizeof(config
->tundevicename
));
713 tunidx
= if_nametoindex(config
->tundevicename
);
716 LOG(0, 0, 0, "Can't get tun interface index\n");
725 struct ifinfomsg ifinfo
;
726 struct ifaddrmsg ifaddr
;
728 char rtdata
[32]; // 32 should be enough
730 uint32_t txqlen
, mtu
;
733 memset(&req
, 0, sizeof(req
));
735 req
.nh
.nlmsg_type
= RTM_NEWLINK
;
736 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_MULTI
;
737 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifinfo
));
739 req
.ifmsg
.ifinfo
.ifi_family
= AF_UNSPEC
;
740 req
.ifmsg
.ifinfo
.ifi_index
= tunidx
;
741 req
.ifmsg
.ifinfo
.ifi_flags
|= IFF_UP
; // set interface up
742 req
.ifmsg
.ifinfo
.ifi_change
= IFF_UP
; // only change this flag
744 /* Bump up the qlen to deal with bursts from the network */
746 netlink_addattr(&req
.nh
, IFLA_TXQLEN
, &txqlen
, sizeof(txqlen
));
747 /* set MTU to modem MRU */
749 netlink_addattr(&req
.nh
, IFLA_MTU
, &mtu
, sizeof(mtu
));
751 if (netlink_send(&req
.nh
) < 0)
754 memset(&req
, 0, sizeof(req
));
756 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
757 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
758 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
760 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET
;
761 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 32;
762 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
763 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
765 if (config
->iftun_address
)
766 ip
= config
->iftun_address
;
768 ip
= 0x01010101; // 1.1.1.1
769 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
771 if (netlink_send(&req
.nh
) < 0)
774 // Only setup IPv6 on the tun device if we have a configured prefix
775 if (config
->ipv6_prefix
.s6_addr
[0]) {
778 memset(&req
, 0, sizeof(req
));
780 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
781 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
782 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
784 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
785 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
786 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_LINK
;
787 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
789 // Link local address is FE80::1
790 memset(&ip6
, 0, sizeof(ip6
));
791 ip6
.s6_addr
[0] = 0xFE;
792 ip6
.s6_addr
[1] = 0x80;
794 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
796 if (netlink_send(&req
.nh
) < 0)
799 memset(&req
, 0, sizeof(req
));
801 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
802 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
803 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
805 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
806 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
807 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
808 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
810 // Global address is prefix::1
811 ip6
= config
->ipv6_prefix
;
813 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
815 if (netlink_send(&req
.nh
) < 0)
819 memset(&req
, 0, sizeof(req
));
821 req
.nh
.nlmsg_type
= NLMSG_DONE
;
822 req
.nh
.nlmsg_len
= NLMSG_LENGTH(0);
824 if (netlink_send(&req
.nh
) < 0)
827 // if we get an error for seqnum < min_initok_nlseqnum,
828 // we must exit as initialization went wrong
829 if (config
->ipv6_prefix
.s6_addr
[0])
830 min_initok_nlseqnum
= 5 + 1; // idx + if + addr + 2*addr6
832 min_initok_nlseqnum
= 3 + 1; // idx + if + addr
838 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno
));
843 static void initudp(void)
846 struct sockaddr_in addr
;
849 memset(&addr
, 0, sizeof(addr
));
850 addr
.sin_family
= AF_INET
;
851 addr
.sin_port
= htons(L2TPPORT
);
852 addr
.sin_addr
.s_addr
= config
->bind_address
;
853 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
854 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
856 int flags
= fcntl(udpfd
, F_GETFL
, 0);
857 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
859 if (bind(udpfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
861 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
866 memset(&addr
, 0, sizeof(addr
));
867 addr
.sin_family
= AF_INET
;
868 addr
.sin_port
= htons(NSCTL_PORT
);
869 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
870 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
871 setsockopt(controlfd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
872 if (bind(controlfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
874 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
878 // Dynamic Authorization Extensions to RADIUS
879 memset(&addr
, 0, sizeof(addr
));
880 addr
.sin_family
= AF_INET
;
881 addr
.sin_port
= htons(config
->radius_dae_port
);
882 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
883 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
884 setsockopt(daefd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
885 if (bind(daefd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
887 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
892 // Tunnel to Remote LNS
893 memset(&addr
, 0, sizeof(addr
));
894 addr
.sin_family
= AF_INET
;
895 addr
.sin_port
= htons(config
->bind_portremotelns
);
896 addr
.sin_addr
.s_addr
= config
->bind_address_remotelns
;
897 udplacfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
898 setsockopt(udplacfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
900 int flags
= fcntl(udplacfd
, F_GETFL
, 0);
901 fcntl(udplacfd
, F_SETFL
, flags
| O_NONBLOCK
);
903 if (bind(udplacfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
905 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno
));
911 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
915 // Find session by IP, < 1 for not found
917 // Confusingly enough, this 'ip' must be
918 // in _network_ order. This being the common
919 // case when looking it up from IP packet headers.
921 // We actually use this cache for two things.
922 // #1. For used IP addresses, this maps to the
923 // session ID that it's used by.
924 // #2. For un-used IP addresses, this maps to the
925 // index into the pool table that contains that
929 static sessionidt
lookup_ipmap(in_addr_t ip
)
931 uint8_t *a
= (uint8_t *) &ip
;
932 union iphash
*h
= ip_hash
;
934 if (!(h
= h
[*a
++].idx
)) return 0;
935 if (!(h
= h
[*a
++].idx
)) return 0;
936 if (!(h
= h
[*a
++].idx
)) return 0;
941 static sessionidt
lookup_ipv6map(struct in6_addr ip
)
943 struct ipv6radix
*curnode
;
946 char ipv6addr
[INET6_ADDRSTRLEN
];
948 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
952 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
954 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
959 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
960 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
967 sessionidt
sessionbyip(in_addr_t ip
)
969 sessionidt s
= lookup_ipmap(ip
);
972 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
978 sessionidt
sessionbyipv6(struct in6_addr ip
)
981 CSTAT(sessionbyipv6
);
983 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
984 (ip
.s6_addr
[0] == 0xFE &&
985 ip
.s6_addr
[1] == 0x80 &&
986 ip
.s6_addr16
[1] == 0 &&
987 ip
.s6_addr16
[2] == 0 &&
988 ip
.s6_addr16
[3] == 0)) {
989 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
991 s
= lookup_ipv6map(ip
);
994 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
1001 // Take an IP address in HOST byte order and
1002 // add it to the sessionid by IP cache.
1004 // (It's actually cached in network order)
1006 static void cache_ipmap(in_addr_t ip
, sessionidt s
)
1008 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1009 uint8_t *a
= (uint8_t *) &nip
;
1010 union iphash
*h
= ip_hash
;
1013 for (i
= 0; i
< 3; i
++)
1015 if (!(h
[a
[i
]].idx
|| (h
[a
[i
]].idx
= calloc(256, sizeof(union iphash
)))))
1024 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
1027 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
1028 // else a map to an ip pool index.
1031 static void uncache_ipmap(in_addr_t ip
)
1033 cache_ipmap(ip
, 0); // Assign it to the NULL session.
1036 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
)
1040 struct ipv6radix
*curnode
;
1041 char ipv6addr
[INET6_ADDRSTRLEN
];
1043 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
1045 bytes
= prefixlen
>> 3;
1048 if (curnode
->branch
== NULL
)
1050 if (!(curnode
->branch
= calloc(256,
1051 sizeof (struct ipv6radix
))))
1054 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
1061 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
1062 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1066 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1067 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1073 // CLI list to dump current ipcache.
1075 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
1077 union iphash
*d
= ip_hash
, *e
, *f
, *g
;
1081 if (CLI_HELP_REQUESTED
)
1082 return CLI_HELP_NO_ARGS
;
1084 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
1086 for (i
= 0; i
< 256; ++i
)
1092 for (j
= 0; j
< 256; ++j
)
1098 for (k
= 0; k
< 256; ++k
)
1104 for (l
= 0; l
< 256; ++l
)
1109 cli_print(cli
, "%7d %d.%d.%d.%d", g
[l
].sess
, i
, j
, k
, l
);
1115 cli_print(cli
, "%d entries in cache", count
);
1120 // Find session by username, 0 for not found
1121 // walled garden users aren't authenticated, so the username is
1122 // reasonably useless. Ignore them to avoid incorrect actions
1124 // This is VERY inefficent. Don't call it often. :)
1126 sessionidt
sessionbyuser(char *username
)
1129 CSTAT(sessionbyuser
);
1131 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1133 if (!session
[s
].opened
)
1136 if (session
[s
].walled_garden
)
1137 continue; // Skip walled garden users.
1139 if (!strncmp(session
[s
].user
, username
, 128))
1143 return 0; // Not found.
1146 void send_garp(in_addr_t ip
)
1152 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
1155 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
1158 memset(&ifr
, 0, sizeof(ifr
));
1159 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
1160 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
1162 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
1166 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
1167 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
1169 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
1174 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
1177 static sessiont
*sessiontbysessionidt(sessionidt s
)
1179 if (!s
|| s
>= MAXSESSION
) return NULL
;
1183 static sessionidt
sessionidtbysessiont(sessiont
*s
)
1185 sessionidt val
= s
-session
;
1186 if (s
< session
|| val
>= MAXSESSION
) return 0;
1190 // actually send a control message for a specific tunnel
1191 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
1193 struct sockaddr_in addr
;
1199 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
1200 STAT(tunnel_tx_errors
);
1204 if (t
== TUNNEL_ID_PPPOE
)
1206 pppoe_sess_send(buf
, l
, t
);
1212 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1213 STAT(tunnel_tx_errors
);
1217 memset(&addr
, 0, sizeof(addr
));
1218 addr
.sin_family
= AF_INET
;
1219 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
1220 addr
.sin_port
= htons(tunnel
[t
].port
);
1222 // sequence expected, if sequence in message
1223 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
1225 // If this is a control message, deal with retries
1228 tunnel
[t
].last
= time_now
; // control message sent
1229 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
1232 STAT(tunnel_retries
);
1233 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
1237 if (sendto((tunnel
[t
].isremotelns
?udplacfd
:udpfd
), buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1239 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1242 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1243 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
1244 STAT(tunnel_tx_errors
);
1248 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
1249 STAT(tunnel_tx_packets
);
1250 INC_STAT(tunnel_tx_bytes
, l
);
1254 // Tiny helper function to write data to
1255 // the 'tun' device.
1257 int tun_write(uint8_t * data
, int size
)
1259 return write(tunfd
, data
, size
);
1262 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1263 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1265 int d
= (tcp
[12] >> 4) * 4;
1272 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1275 if (tcp
+ d
> buf
+ len
) // short?
1283 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1286 if (mss
+ 2 > data
) return; // short?
1290 if (*opts
== 0) return; // end of options
1291 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1294 opts
+= opts
[1]; // skip over option
1297 if (!mss
) return; // not found
1298 orig
= ntohs(*(uint16_t *) mss
);
1300 if (orig
<= MSS
) return; // mss OK
1302 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1303 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1304 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1305 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1308 *(int16_t *) mss
= htons(MSS
);
1310 // adjust checksum (see rfc1141)
1311 sum
= orig
+ (~MSS
& 0xffff);
1312 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1313 sum
= (sum
& 0xffff) + (sum
>> 16);
1314 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1317 void processmpframe(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint8_t extra
)
1321 // Skip the four extra bytes
1333 proto
= ntohs(*(uint16_t *) p
);
1341 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1342 return; // closing session, PPP not processed
1344 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1345 processipin(s
, t
, p
, l
);
1347 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
1351 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1352 return; // closing session, PPP not processed
1355 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1356 processipv6in(s
, t
, p
, l
);
1358 else if (proto
== PPPIPCP
)
1360 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1361 processipcp(s
, t
, p
, l
);
1363 else if (proto
== PPPCCP
)
1365 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1366 processccp(s
, t
, p
, l
);
1370 LOG(2, s
, t
, "MPPP: Unsupported MP protocol 0x%04X received\n",proto
);
1374 static void update_session_out_stat(sessionidt s
, sessiont
*sp
, int len
)
1376 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1377 sp
->cout_delta
+= len
;
1379 sp
->last_data
= time_now
;
1381 sess_local
[s
].cout
+= len
; // To send to master..
1382 sess_local
[s
].pout
++;
1385 // process outgoing (to tunnel) IP
1387 // (i.e. this routine writes to data[-8]).
1388 void processipout(uint8_t *buf
, int len
)
1395 uint8_t *data
= buf
; // Keep a copy of the originals.
1398 uint8_t fragbuf
[MAXETHER
+ 20];
1400 CSTAT(processipout
);
1402 if (len
< MIN_IP_SIZE
)
1404 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1405 STAT(tun_rx_errors
);
1408 if (len
>= MAXETHER
)
1410 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1411 STAT(tun_rx_errors
);
1415 // Skip the tun header
1419 // Got an IP header now
1420 if (*(uint8_t *)(buf
) >> 4 != 4)
1422 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1426 ip
= *(uint32_t *)(buf
+ 16);
1427 if (!(s
= sessionbyip(ip
)))
1429 // Is this a packet for a session that doesn't exist?
1430 static int rate
= 0; // Number of ICMP packets we've sent this second.
1431 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1433 if (last
!= time_now
)
1439 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1441 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1442 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1443 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1448 t
= session
[s
].tunnel
;
1449 if (len
> session
[s
].mru
|| (session
[s
].mrru
&& len
> session
[s
].mrru
))
1451 LOG(3, s
, t
, "Packet size more than session MRU\n");
1457 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1458 if (config
->max_packets
> 0)
1460 if (sess_local
[s
].last_packet_out
== TIME
)
1462 int max
= config
->max_packets
;
1464 // All packets for throttled sessions are handled by the
1465 // master, so further limit by using the throttle rate.
1466 // A bit of a kludge, since throttle rate is in kbps,
1467 // but should still be generous given our average DSL
1468 // packet size is 200 bytes: a limit of 28kbps equates
1469 // to around 180 packets per second.
1470 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1471 max
= sp
->throttle_out
;
1473 if (++sess_local
[s
].packets_out
> max
)
1475 sess_local
[s
].packets_dropped
++;
1481 if (sess_local
[s
].packets_dropped
)
1483 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1484 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1485 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1486 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1490 sess_local
[s
].last_packet_out
= TIME
;
1491 sess_local
[s
].packets_out
= 1;
1492 sess_local
[s
].packets_dropped
= 0;
1496 // run access-list if any
1497 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1500 // adjust MSS on SYN and SYN,ACK packets with options
1501 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1503 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1504 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1505 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1510 // Are we throttling this session?
1511 if (config
->cluster_iam_master
)
1512 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1514 master_throttle_packet(sp
->tbf_out
, data
, size
);
1518 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1520 // We are walled-gardening this
1521 master_garden_packet(s
, data
, size
);
1525 if(session
[s
].bundle
!= 0 && bundle
[session
[s
].bundle
].num_of_links
> 1)
1528 if (!config
->cluster_iam_master
)
1530 // The MPPP packets must be managed by the Master.
1531 master_forward_mppp_packet(s
, data
, size
);
1535 // Add on L2TP header
1536 sessionidt members
[MAXBUNDLESES
];
1537 bundleidt bid
= session
[s
].bundle
;
1538 bundlet
*b
= &bundle
[bid
];
1539 uint32_t num_of_links
, nb_opened
;
1542 num_of_links
= b
->num_of_links
;
1544 for (i
= 0;i
< num_of_links
;i
++)
1547 if (session
[s
].ppp
.lcp
== Opened
)
1549 members
[nb_opened
] = s
;
1556 LOG(3, s
, t
, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid
);
1560 num_of_links
= nb_opened
;
1561 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1562 s
= members
[b
->current_ses
];
1563 t
= session
[s
].tunnel
;
1565 LOG(4, s
, t
, "MPPP: (1)Session number becomes: %d\n", s
);
1567 if (num_of_links
> 1)
1569 if(len
> MINFRAGLEN
)
1571 //for rotate traffic among the member links
1572 uint32_t divisor
= num_of_links
;
1574 divisor
= divisor
/2 + (divisor
& 1);
1576 // Partition the packet to "num_of_links" fragments
1577 uint32_t fraglen
= len
/ divisor
;
1578 uint32_t last_fraglen
= fraglen
+ len
% divisor
;
1579 uint32_t remain
= len
;
1581 // send the first packet
1582 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, fraglen
, s
, t
, PPPIP
, 0, bid
, MP_BEGIN
);
1584 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1587 update_session_out_stat(s
, sp
, fraglen
);
1590 while (remain
> last_fraglen
)
1592 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1593 s
= members
[b
->current_ses
];
1594 t
= session
[s
].tunnel
;
1596 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1597 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), fraglen
, s
, t
, PPPIP
, 0, bid
, 0);
1599 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1600 update_session_out_stat(s
, sp
, fraglen
);
1603 // send the last fragment
1604 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1605 s
= members
[b
->current_ses
];
1606 t
= session
[s
].tunnel
;
1608 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1609 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), remain
, s
, t
, PPPIP
, 0, bid
, MP_END
);
1611 tunnelsend(fragbuf
, remain
+ (p
-fragbuf
), t
); // send it...
1612 update_session_out_stat(s
, sp
, remain
);
1613 if (remain
!= last_fraglen
)
1614 LOG(3, s
, t
, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain
, last_fraglen
);
1618 // Send it as one frame
1619 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, bid
, MP_BOTH_BITS
);
1621 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1622 LOG(4, s
, t
, "MPPP: packet sent as one frame\n");
1623 update_session_out_stat(s
, sp
, len
);
1628 // Send it as one frame (NO MPPP Frame)
1629 uint8_t *p
= opt_makeppp(buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1630 tunnelsend(p
, len
+ (buf
-p
), t
); // send it...
1631 update_session_out_stat(s
, sp
, len
);
1636 uint8_t *p
= opt_makeppp(buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1637 tunnelsend(p
, len
+ (buf
-p
), t
); // send it...
1638 update_session_out_stat(s
, sp
, len
);
1641 // Snooping this session, send it to intercept box
1642 if (sp
->snoop_ip
&& sp
->snoop_port
)
1643 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1648 // process outgoing (to tunnel) IPv6
1650 static void processipv6out(uint8_t * buf
, int len
)
1656 struct in6_addr ip6
;
1658 uint8_t *data
= buf
; // Keep a copy of the originals.
1661 uint8_t b
[MAXETHER
+ 20];
1663 CSTAT(processipv6out
);
1665 if (len
< MIN_IP_SIZE
)
1667 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1668 STAT(tunnel_tx_errors
);
1671 if (len
>= MAXETHER
)
1673 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1674 STAT(tunnel_tx_errors
);
1678 // Skip the tun header
1682 // Got an IP header now
1683 if (*(uint8_t *)(buf
) >> 4 != 6)
1685 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1689 ip6
= *(struct in6_addr
*)(buf
+24);
1690 s
= sessionbyipv6(ip6
);
1694 ip
= *(uint32_t *)(buf
+ 32);
1695 s
= sessionbyip(ip
);
1700 // Is this a packet for a session that doesn't exist?
1701 static int rate
= 0; // Number of ICMP packets we've sent this second.
1702 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1704 if (last
!= time_now
)
1710 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1712 // FIXME: Should send icmp6 host unreachable
1716 if (session
[s
].bundle
&& bundle
[session
[s
].bundle
].num_of_links
> 1)
1718 bundleidt bid
= session
[s
].bundle
;
1719 bundlet
*b
= &bundle
[bid
];
1721 b
->current_ses
= (b
->current_ses
+ 1) % b
->num_of_links
;
1722 s
= b
->members
[b
->current_ses
];
1723 LOG(3, s
, session
[s
].tunnel
, "MPPP: Session number becomes: %u\n", s
);
1725 t
= session
[s
].tunnel
;
1727 sp
->last_data
= time_now
;
1729 // FIXME: add DoS prevention/filters?
1733 // Are we throttling this session?
1734 if (config
->cluster_iam_master
)
1735 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1737 master_throttle_packet(sp
->tbf_out
, data
, size
);
1740 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1742 // We are walled-gardening this
1743 master_garden_packet(s
, data
, size
);
1747 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1749 // Add on L2TP header
1751 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0);
1753 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1756 // Snooping this session, send it to intercept box
1757 if (sp
->snoop_ip
&& sp
->snoop_port
)
1758 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1760 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1761 sp
->cout_delta
+= len
;
1765 sess_local
[s
].cout
+= len
; // To send to master..
1766 sess_local
[s
].pout
++;
1770 // Helper routine for the TBF filters.
1771 // Used to send queued data in to the user!
1773 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1778 uint8_t b
[MAXETHER
+ 20];
1780 if (len
< 0 || len
> MAXETHER
)
1782 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1786 // Skip the tun header
1793 t
= session
[s
].tunnel
;
1796 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1798 // Add on L2TP header
1800 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1802 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1805 // Snooping this session.
1806 if (sp
->snoop_ip
&& sp
->snoop_port
)
1807 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1809 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1810 sp
->cout_delta
+= len
;
1814 sess_local
[s
].cout
+= len
; // To send to master..
1815 sess_local
[s
].pout
++;
1818 // add an AVP (16 bit)
1819 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1821 uint16_t l
= (m
? 0x8008 : 0x0008);
1822 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1823 c
->buf16
[c
->length
/2 + 1] = htons(0);
1824 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1825 c
->buf16
[c
->length
/2 + 3] = htons(val
);
1829 // add an AVP (32 bit)
1830 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1832 uint16_t l
= (m
? 0x800A : 0x000A);
1833 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1834 c
->buf16
[c
->length
/2 + 1] = htons(0);
1835 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1836 *(uint32_t *) &c
->buf
[c
->length
+ 6] = htonl(val
);
1840 // add an AVP (string)
1841 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1843 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1844 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1845 c
->buf16
[c
->length
/2 + 1] = htons(0);
1846 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1847 memcpy(&c
->buf
[c
->length
+ 6], val
, strlen(val
));
1848 c
->length
+= 6 + strlen(val
);
1852 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1854 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1855 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1856 c
->buf16
[c
->length
/2 + 1] = htons(0);
1857 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1858 memcpy(&c
->buf
[c
->length
+ 6], val
, len
);
1859 c
->length
+= 6 + len
;
1862 // new control connection
1863 static controlt
*controlnew(uint16_t mtype
)
1867 c
= malloc(sizeof(controlt
));
1871 controlfree
= c
->next
;
1875 c
->buf16
[0] = htons(0xC802); // flags/ver
1877 control16(c
, 0, mtype
, 1);
1881 // send zero block if nothing is waiting
1883 static void controlnull(tunnelidt t
)
1886 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1889 buf
[0] = htons(0xC802); // flags/ver
1890 buf
[1] = htons(12); // length
1891 buf
[2] = htons(tunnel
[t
].far
); // tunnel
1892 buf
[3] = htons(0); // session
1893 buf
[4] = htons(tunnel
[t
].ns
); // sequence
1894 buf
[5] = htons(tunnel
[t
].nr
); // sequence
1895 tunnelsend((uint8_t *)buf
, 12, t
);
1898 // add a control message to a tunnel, and send if within window
1899 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1901 c
->buf16
[1] = htons(c
->length
); // length
1902 c
->buf16
[2] = htons(tunnel
[t
].far
); // tunnel
1903 c
->buf16
[3] = htons(far
); // session
1904 c
->buf16
[4] = htons(tunnel
[t
].ns
); // sequence
1905 tunnel
[t
].ns
++; // advance sequence
1906 // link in message in to queue
1907 if (tunnel
[t
].controlc
)
1908 tunnel
[t
].controle
->next
= c
;
1910 tunnel
[t
].controls
= c
;
1912 tunnel
[t
].controle
= c
;
1913 tunnel
[t
].controlc
++;
1915 // send now if space in window
1916 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1918 tunnel
[t
].try = 0; // first send
1919 tunnelsend(c
->buf
, c
->length
, t
);
1924 // Throttle or Unthrottle a session
1926 // Throttle the data from/to through a session to no more than
1927 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1930 // If either value is -1, the current value is retained for that
1933 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1935 if (!session
[s
].opened
)
1936 return; // No-one home.
1938 if (!*session
[s
].user
)
1939 return; // User not logged in
1943 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1944 if (session
[s
].tbf_in
)
1945 free_tbf(session
[s
].tbf_in
);
1948 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1950 session
[s
].tbf_in
= 0;
1952 session
[s
].throttle_in
= rate_in
;
1957 int bytes
= rate_out
* 1024 / 8;
1958 if (session
[s
].tbf_out
)
1959 free_tbf(session
[s
].tbf_out
);
1962 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1964 session
[s
].tbf_out
= 0;
1966 session
[s
].throttle_out
= rate_out
;
1970 // add/remove filters from session (-1 = no change)
1971 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1973 if (!session
[s
].opened
)
1974 return; // No-one home.
1976 if (!*session
[s
].user
)
1977 return; // User not logged in
1980 if (filter_in
> MAXFILTER
) filter_in
= -1;
1981 if (filter_out
> MAXFILTER
) filter_out
= -1;
1982 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1983 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1987 if (session
[s
].filter_in
)
1988 ip_filters
[session
[s
].filter_in
- 1].used
--;
1991 ip_filters
[filter_in
- 1].used
++;
1993 session
[s
].filter_in
= filter_in
;
1996 if (filter_out
>= 0)
1998 if (session
[s
].filter_out
)
1999 ip_filters
[session
[s
].filter_out
- 1].used
--;
2002 ip_filters
[filter_out
- 1].used
++;
2004 session
[s
].filter_out
= filter_out
;
2008 // start tidy shutdown of session
2009 void sessionshutdown(sessionidt s
, char const *reason
, int cdn_result
, int cdn_error
, int term_cause
)
2011 int walled_garden
= session
[s
].walled_garden
;
2012 bundleidt b
= session
[s
].bundle
;
2013 //delete routes only for last session in bundle (in case of MPPP)
2014 int del_routes
= !b
|| (bundle
[b
].num_of_links
== 1);
2016 CSTAT(sessionshutdown
);
2018 if (!session
[s
].opened
)
2020 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
2021 return; // not a live session
2024 if (!session
[s
].die
)
2026 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
2027 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %u: %s\n", s
, reason
);
2028 run_plugins(PLUGIN_KILL_SESSION
, &data
);
2031 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
2033 // RADIUS Stop message
2034 uint16_t r
= radiusnew(s
);
2037 // stop, if not already trying
2038 if (radius
[r
].state
!= RADIUSSTOP
)
2040 radius
[r
].term_cause
= term_cause
;
2041 radius
[r
].term_msg
= reason
;
2042 radiussend(r
, RADIUSSTOP
);
2046 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
2048 // Save counters to dump to accounting file
2049 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
2050 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
2053 if (!session
[s
].die
)
2054 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
2057 { // IP allocated, clear and unroute
2060 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
2062 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
2063 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
2066 if (del_routes
) routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 0);
2067 session
[s
].route
[r
].ip
= 0;
2070 if (session
[s
].ip_pool_index
== -1) // static ip
2072 if (!routed
&& del_routes
) routeset(s
, session
[s
].ip
, 0, 0, 0);
2078 // unroute IPv6, if setup
2079 if (session
[s
].ppp
.ipv6cp
== Opened
&& session
[s
].ipv6prefixlen
&& del_routes
)
2080 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
2084 // This session was part of a bundle
2085 bundle
[b
].num_of_links
--;
2086 LOG(3, s
, session
[s
].tunnel
, "MPPP: Dropping member link: %d from bundle %d\n",s
,b
);
2087 if(bundle
[b
].num_of_links
== 0)
2090 LOG(3, s
, session
[s
].tunnel
, "MPPP: Kill bundle: %d (No remaing member links)\n",b
);
2094 // Adjust the members array to accomodate the new change
2095 uint8_t mem_num
= 0;
2096 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2097 if(bundle
[b
].members
[bundle
[b
].num_of_links
] != s
)
2100 for(ml
= 0; ml
<bundle
[b
].num_of_links
; ml
++)
2101 if(bundle
[b
].members
[ml
] == s
)
2106 bundle
[b
].members
[mem_num
] = bundle
[b
].members
[bundle
[b
].num_of_links
];
2107 LOG(3, s
, session
[s
].tunnel
, "MPPP: Adjusted member links array\n");
2109 // If the killed session is the first of the bundle,
2110 // the new first session must be stored in the cache_ipmap
2111 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2114 sessionidt new_s
= bundle
[b
].members
[0];
2117 // Add the route for this session.
2118 for (r
= 0; r
< MAXROUTE
&& session
[new_s
].route
[r
].ip
; r
++)
2123 prefixlen
= session
[new_s
].route
[r
].prefixlen
;
2124 ip
= session
[new_s
].route
[r
].ip
;
2126 if (!prefixlen
) prefixlen
= 32;
2127 ip
&= 0xffffffff << (32 - prefixlen
); // Force the ip to be the first one in the route.
2129 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
2130 cache_ipmap(i
, new_s
);
2132 cache_ipmap(session
[new_s
].ip
, new_s
);
2135 if (session
[new_s
].ipv6prefixlen
)
2136 cache_ipv6map(session
[new_s
].ipv6route
, session
[new_s
].ipv6prefixlen
, new_s
);
2141 cluster_send_bundle(b
);
2145 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
2146 throttle_session(s
, 0, 0);
2150 if (session
[s
].tunnel
== TUNNEL_ID_PPPOE
)
2152 pppoe_shutdown_session(s
);
2157 controlt
*c
= controlnew(14); // sending CDN
2161 buf
[0] = htons(cdn_result
);
2162 buf
[1] = htons(cdn_error
);
2163 controlb(c
, 1, (uint8_t *)buf
, 4, 1);
2166 control16(c
, 1, cdn_result
, 1);
2168 control16(c
, 14, s
, 1); // assigned session (our end)
2169 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
2173 // update filter refcounts
2174 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
2175 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
2178 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
2179 sess_local
[s
].lcp
.restart
= 0;
2180 sess_local
[s
].ipcp
.restart
= 0;
2181 sess_local
[s
].ipv6cp
.restart
= 0;
2182 sess_local
[s
].ccp
.restart
= 0;
2184 cluster_send_session(s
);
2187 void sendipcp(sessionidt s
, tunnelidt t
)
2189 uint8_t buf
[MAXETHER
];
2193 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
2195 if (!session
[s
].unique_id
)
2197 if (!++last_id
) ++last_id
; // skip zero
2198 session
[s
].unique_id
= last_id
;
2201 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
, 0, 0, 0);
2205 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
2206 *(uint16_t *) (q
+ 2) = htons(10); // packet length
2207 q
[4] = 3; // ip address option
2208 q
[5] = 6; // option length
2209 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
2210 config
->iftun_address
? config
->iftun_address
:
2211 my_address
; // send my IP
2213 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
2214 restart_timer(s
, ipcp
);
2217 void sendipv6cp(sessionidt s
, tunnelidt t
)
2219 uint8_t buf
[MAXETHER
];
2223 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
2225 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
, 0, 0, 0);
2229 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
2230 // only send one type
2232 *(uint16_t *) (q
+ 2) = htons(14);
2233 q
[4] = 1; // interface identifier option
2234 q
[5] = 10; // option length
2235 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
2236 *(uint32_t *) (q
+ 10) = 0;
2239 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
2240 restart_timer(s
, ipv6cp
);
2243 static void sessionclear(sessionidt s
)
2245 memset(&session
[s
], 0, sizeof(session
[s
]));
2246 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
2247 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
2249 session
[s
].tunnel
= T_FREE
; // Mark it as free.
2250 session
[s
].next
= sessionfree
;
2254 // kill a session now
2255 void sessionkill(sessionidt s
, char *reason
)
2259 if (!session
[s
].opened
) // not alive
2262 if (session
[s
].next
)
2264 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%u)\n", session
[s
].next
);
2268 if (!session
[s
].die
)
2269 sessionshutdown(s
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
2271 if (sess_local
[s
].radius
)
2272 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
2275 if (session
[s
].forwardtosession
)
2277 sessionidt sess
= session
[s
].forwardtosession
;
2278 if (session
[sess
].forwardtosession
== s
)
2280 // Shutdown the linked session also.
2281 sessionshutdown(sess
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
2286 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
2288 cluster_send_session(s
);
2291 static void tunnelclear(tunnelidt t
)
2294 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
2295 tunnel
[t
].state
= TUNNELFREE
;
2298 static void bundleclear(bundleidt b
)
2301 memset(&bundle
[b
], 0, sizeof(bundle
[b
]));
2302 bundle
[b
].state
= BUNDLEFREE
;
2305 // kill a tunnel now
2306 static void tunnelkill(tunnelidt t
, char *reason
)
2313 tunnel
[t
].state
= TUNNELDIE
;
2315 // free control messages
2316 while ((c
= tunnel
[t
].controls
))
2318 controlt
* n
= c
->next
;
2319 tunnel
[t
].controls
= n
;
2320 tunnel
[t
].controlc
--;
2321 c
->next
= controlfree
;
2325 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2326 if (session
[s
].tunnel
== t
)
2327 sessionkill(s
, reason
);
2331 LOG(1, 0, t
, "Kill tunnel %u: %s\n", t
, reason
);
2332 cli_tunnel_actions
[t
].action
= 0;
2333 cluster_send_tunnel(t
);
2336 // shut down a tunnel cleanly
2337 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
2341 CSTAT(tunnelshutdown
);
2343 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
2345 // never set up, can immediately kill
2346 tunnelkill(t
, reason
);
2349 LOG(1, 0, t
, "Shutting down tunnel %u (%s)\n", t
, reason
);
2352 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2353 if (session
[s
].tunnel
== t
)
2354 sessionshutdown(s
, reason
, CDN_NONE
, TERM_ADMIN_RESET
);
2356 tunnel
[t
].state
= TUNNELDIE
;
2357 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
2358 cluster_send_tunnel(t
);
2359 // TBA - should we wait for sessions to stop?
2362 controlt
*c
= controlnew(4); // sending StopCCN
2367 buf
[0] = htons(result
);
2368 buf
[1] = htons(error
);
2371 int m
= strlen(msg
);
2372 if (m
+ 4 > sizeof(buf
))
2373 m
= sizeof(buf
) - 4;
2375 memcpy(buf
+2, msg
, m
);
2379 controlb(c
, 1, (uint8_t *)buf
, l
, 1);
2382 control16(c
, 1, result
, 1);
2384 control16(c
, 9, t
, 1); // assigned tunnel (our end)
2385 controladd(c
, 0, t
); // send the message
2389 // read and process packet on tunnel (UDP)
2390 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
2392 uint8_t *chapresponse
= NULL
;
2393 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
2394 uint8_t *p
= buf
+ 2;
2401 LOG_HEX(5, "UDP Data", buf
, len
);
2402 STAT(tunnel_rx_packets
);
2403 INC_STAT(tunnel_rx_bytes
, len
);
2406 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
2407 STAT(tunnel_rx_errors
);
2410 if ((buf
[1] & 0x0F) != 2)
2412 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf
[1] & 0x0F);
2413 STAT(tunnel_rx_errors
);
2418 l
= ntohs(*(uint16_t *) p
);
2421 t
= ntohs(*(uint16_t *) p
);
2423 s
= ntohs(*(uint16_t *) p
);
2425 if (s
>= MAXSESSION
)
2427 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
2428 STAT(tunnel_rx_errors
);
2433 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
2434 STAT(tunnel_rx_errors
);
2437 if (t
== TUNNEL_ID_PPPOE
)
2439 LOG(1, s
, t
, "Received UDP packet with tunnel ID reserved for pppoe\n");
2440 STAT(tunnel_rx_errors
);
2445 ns
= ntohs(*(uint16_t *) p
);
2447 nr
= ntohs(*(uint16_t *) p
);
2452 uint16_t o
= ntohs(*(uint16_t *) p
);
2457 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
2458 STAT(tunnel_rx_errors
);
2463 // used to time out old tunnels
2464 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
2465 tunnel
[t
].lastrec
= time_now
;
2469 uint16_t message
= 0xFFFF; // message type
2471 uint8_t mandatory
= 0;
2472 uint16_t asession
= 0; // assigned session
2473 uint32_t amagic
= 0; // magic number
2474 uint8_t aflags
= 0; // flags from last LCF
2475 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2476 char called
[MAXTEL
] = ""; // called number
2477 char calling
[MAXTEL
] = ""; // calling number
2479 if (!config
->cluster_iam_master
)
2481 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2485 // control messages must have bits 0x80|0x40|0x08
2486 // (type, length and sequence) set, and bits 0x02|0x01
2487 // (offset and priority) clear
2488 if ((*buf
& 0xCB) != 0xC8)
2490 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
2491 STAT(tunnel_rx_errors
);
2495 // check for duplicate tunnel open message
2501 // Is this a duplicate of the first packet? (SCCRQ)
2503 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
2505 if (tunnel
[i
].state
!= TUNNELOPENING
||
2506 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
2507 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
2510 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
2515 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2516 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
2518 // if no tunnel specified, assign one
2521 if (!(t
= new_tunnel()))
2523 LOG(1, 0, 0, "No more tunnels\n");
2524 STAT(tunnel_overflow
);
2528 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
2529 tunnel
[t
].port
= ntohs(addr
->sin_port
);
2530 tunnel
[t
].window
= 4; // default window
2531 STAT(tunnel_created
);
2532 LOG(1, 0, t
, " New tunnel from %s:%u ID %u\n",
2533 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
2536 // If the 'ns' just received is not the 'nr' we're
2537 // expecting, just send an ack and drop it.
2539 // if 'ns' is less, then we got a retransmitted packet.
2540 // if 'ns' is greater than missed a packet. Either way
2541 // we should ignore it.
2542 if (ns
!= tunnel
[t
].nr
)
2544 // is this the sequence we were expecting?
2545 STAT(tunnel_rx_errors
);
2546 LOG(1, 0, t
, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2547 t
, ns
, tunnel
[t
].nr
);
2549 if (l
) // Is this not a ZLB?
2554 // check sequence of this message
2556 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2557 // some to clear maybe?
2558 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2560 controlt
*c
= tunnel
[t
].controls
;
2561 tunnel
[t
].controls
= c
->next
;
2562 tunnel
[t
].controlc
--;
2563 c
->next
= controlfree
;
2566 tunnel
[t
].try = 0; // we have progress
2569 // receiver advance (do here so quoted correctly in any sends below)
2570 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2571 if (skip
< 0) skip
= 0;
2572 if (skip
< tunnel
[t
].controlc
)
2574 // some control packets can now be sent that were previous stuck out of window
2575 int tosend
= tunnel
[t
].window
- skip
;
2576 controlt
*c
= tunnel
[t
].controls
;
2584 tunnel
[t
].try = 0; // first send
2585 tunnelsend(c
->buf
, c
->length
, t
);
2590 if (!tunnel
[t
].controlc
)
2591 tunnel
[t
].retry
= 0; // caught up
2594 { // if not a null message
2599 // Default disconnect cause/message on receipt of CDN. Set to
2600 // more specific value from attribute 1 (result code) or 46
2601 // (disconnect cause) if present below.
2602 int disc_cause_set
= 0;
2603 int disc_cause
= TERM_NAS_REQUEST
;
2604 char const *disc_reason
= "Closed (Received CDN).";
2607 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2609 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2616 LOG(1, s
, t
, "Invalid length in AVP\n");
2617 STAT(tunnel_rx_errors
);
2622 if (flags
& 0x3C) // reserved bits, should be clear
2624 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2626 result
= 2; // general error
2627 error
= 3; // reserved field non-zero
2632 if (*(uint16_t *) (b
))
2634 LOG(2, s
, t
, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b
)));
2636 result
= 2; // general error
2637 error
= 6; // generic vendor-specific error
2638 msg
= "unsupported vendor-specific";
2642 mtype
= ntohs(*(uint16_t *) (b
));
2650 // handle hidden AVPs
2651 if (!*config
->l2tp_secret
)
2653 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2655 result
= 2; // general error
2656 error
= 6; // generic vendor-specific error
2657 msg
= "secret not specified";
2660 if (!session
[s
].random_vector_length
)
2662 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2664 result
= 2; // general error
2665 error
= 6; // generic
2666 msg
= "no random vector";
2671 LOG(2, s
, t
, "Short hidden AVP.\n");
2673 result
= 2; // general error
2674 error
= 2; // length is wrong
2680 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2682 orig_len
= ntohs(*(uint16_t *) b
);
2683 if (orig_len
> n
+ 2)
2685 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2689 result
= 2; // general error
2690 error
= 2; // length is wrong
2699 LOG(4, s
, t
, " AVP %u (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2700 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2704 case 0: // message type
2705 message
= ntohs(*(uint16_t *) b
);
2706 mandatory
= flags
& 0x80;
2707 LOG(4, s
, t
, " Message type = %u (%s)\n", message
, l2tp_code(message
));
2709 case 1: // result code
2711 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2712 char const *resdesc
= "(unknown)";
2713 char const *errdesc
= NULL
;
2718 resdesc
= l2tp_stopccn_result_code(rescode
);
2719 cause
= TERM_LOST_SERVICE
;
2721 else if (message
== 14)
2723 resdesc
= l2tp_cdn_result_code(rescode
);
2725 cause
= TERM_LOST_CARRIER
;
2727 cause
= TERM_ADMIN_RESET
;
2730 LOG(4, s
, t
, " Result Code %u: %s\n", rescode
, resdesc
);
2733 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2734 errdesc
= l2tp_error_code(errcode
);
2735 LOG(4, s
, t
, " Error Code %u: %s\n", errcode
, errdesc
);
2738 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2740 if (cause
&& disc_cause_set
< mtype
) // take cause from attrib 46 in preference
2742 disc_cause_set
= mtype
;
2743 disc_reason
= errdesc
? errdesc
: resdesc
;
2750 case 2: // protocol version
2752 version
= ntohs(*(uint16_t *) (b
));
2753 LOG(4, s
, t
, " Protocol version = %u\n", version
);
2754 if (version
&& version
!= 0x0100)
2755 { // allow 0.0 and 1.0
2756 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2758 result
= 5; // unspported protocol version
2759 error
= 0x0100; // supported version
2765 case 3: // framing capabilities
2767 case 4: // bearer capabilities
2769 case 5: // tie breaker
2770 // We never open tunnels, so we don't care about tie breakers
2772 case 6: // firmware revision
2774 case 7: // host name
2775 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2776 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2777 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2778 // TBA - to send to RADIUS
2780 case 8: // vendor name
2781 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2782 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2783 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2785 case 9: // assigned tunnel
2786 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2787 LOG(4, s
, t
, " Remote tunnel id = %u\n", tunnel
[t
].far
);
2789 case 10: // rx window
2790 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2791 if (!tunnel
[t
].window
)
2792 tunnel
[t
].window
= 1; // window of 0 is silly
2793 LOG(4, s
, t
, " rx window = %u\n", tunnel
[t
].window
);
2795 case 11: // Challenge
2797 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2798 build_chap_response(b
, 2, n
, &chapresponse
);
2801 case 13: // Response
2803 if (tunnel
[t
].isremotelns
)
2805 chapresponse
= calloc(17, 1);
2806 memcpy(chapresponse
, b
, (n
< 17) ? n
: 16);
2807 LOG(3, s
, t
, "received challenge response from REMOTE LNS\n");
2811 // Why did they send a response? We never challenge.
2812 LOG(2, s
, t
, " received unexpected challenge response\n");
2815 case 14: // assigned session
2816 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2817 LOG(4, s
, t
, " assigned session = %u\n", asession
);
2819 case 15: // call serial number
2820 LOG(4, s
, t
, " call serial number = %u\n", ntohl(*(uint32_t *)b
));
2822 case 18: // bearer type
2823 LOG(4, s
, t
, " bearer type = %u\n", ntohl(*(uint32_t *)b
));
2826 case 19: // framing type
2827 LOG(4, s
, t
, " framing type = %u\n", ntohl(*(uint32_t *)b
));
2830 case 21: // called number
2831 memset(called
, 0, sizeof(called
));
2832 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2833 LOG(4, s
, t
, " Called <%s>\n", called
);
2835 case 22: // calling number
2836 memset(calling
, 0, sizeof(calling
));
2837 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2838 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2842 case 24: // tx connect speed
2845 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2849 // AS5300s send connect speed as a string
2851 memset(tmp
, 0, sizeof(tmp
));
2852 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2853 session
[s
].tx_connect_speed
= atol(tmp
);
2855 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2857 case 38: // rx connect speed
2860 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2864 // AS5300s send connect speed as a string
2866 memset(tmp
, 0, sizeof(tmp
));
2867 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2868 session
[s
].rx_connect_speed
= atol(tmp
);
2870 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2872 case 25: // Physical Channel ID
2874 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2875 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2878 case 29: // Proxy Authentication Type
2880 uint16_t atype
= ntohs(*(uint16_t *)b
);
2881 LOG(4, s
, t
, " Proxy Auth Type %u (%s)\n", atype
, ppp_auth_type(atype
));
2884 case 30: // Proxy Authentication Name
2887 memset(authname
, 0, sizeof(authname
));
2888 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2889 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2893 case 31: // Proxy Authentication Challenge
2895 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2898 case 32: // Proxy Authentication ID
2900 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2901 LOG(4, s
, t
, " Proxy Auth ID (%u)\n", authid
);
2904 case 33: // Proxy Authentication Response
2905 LOG(4, s
, t
, " Proxy Auth Response\n");
2907 case 27: // last sent lcp
2908 { // find magic number
2909 uint8_t *p
= b
, *e
= p
+ n
;
2910 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2912 if (*p
== 5 && p
[1] == 6) // Magic-Number
2913 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2914 else if (*p
== 7) // Protocol-Field-Compression
2915 aflags
|= SESSION_PFC
;
2916 else if (*p
== 8) // Address-and-Control-Field-Compression
2917 aflags
|= SESSION_ACFC
;
2922 case 28: // last recv lcp confreq
2924 case 26: // Initial Received LCP CONFREQ
2926 case 39: // seq required - we control it as an LNS anyway...
2928 case 36: // Random Vector
2929 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2930 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2931 if (n
> sizeof(session
[s
].random_vector
))
2932 n
= sizeof(session
[s
].random_vector
);
2933 memcpy(session
[s
].random_vector
, b
, n
);
2934 session
[s
].random_vector_length
= n
;
2936 case 46: // ppp disconnect cause
2939 uint16_t code
= ntohs(*(uint16_t *) b
);
2940 uint16_t proto
= ntohs(*(uint16_t *) (b
+ 2));
2941 uint8_t dir
= *(b
+ 4);
2943 LOG(4, s
, t
, " PPP disconnect cause "
2944 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2945 code
, proto
, dir
, n
- 5, b
+ 5);
2947 disc_cause_set
= mtype
;
2951 case 1: // admin disconnect
2952 disc_cause
= TERM_ADMIN_RESET
;
2953 disc_reason
= "Administrative disconnect";
2955 case 3: // lcp terminate
2956 if (dir
!= 2) break; // 1=peer (LNS), 2=local (LAC)
2957 disc_cause
= TERM_USER_REQUEST
;
2958 disc_reason
= "Normal disconnection";
2960 case 4: // compulsory encryption unavailable
2961 if (dir
!= 1) break; // 1=refused by peer, 2=local
2962 disc_cause
= TERM_USER_ERROR
;
2963 disc_reason
= "Compulsory encryption refused";
2965 case 5: // lcp: fsm timeout
2966 disc_cause
= TERM_PORT_ERROR
;
2967 disc_reason
= "LCP: FSM timeout";
2969 case 6: // lcp: no recognisable lcp packets received
2970 disc_cause
= TERM_PORT_ERROR
;
2971 disc_reason
= "LCP: no recognisable LCP packets";
2973 case 7: // lcp: magic-no error (possibly looped back)
2974 disc_cause
= TERM_PORT_ERROR
;
2975 disc_reason
= "LCP: magic-no error (possible loop)";
2977 case 8: // lcp: echo request timeout
2978 disc_cause
= TERM_PORT_ERROR
;
2979 disc_reason
= "LCP: echo request timeout";
2981 case 13: // auth: fsm timeout
2982 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2983 disc_reason
= "Authentication: FSM timeout";
2985 case 15: // auth: unacceptable auth protocol
2986 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2987 disc_reason
= "Unacceptable authentication protocol";
2989 case 16: // auth: authentication failed
2990 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2991 disc_reason
= "Authentication failed";
2993 case 17: // ncp: fsm timeout
2994 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2995 disc_reason
= "NCP: FSM timeout";
2997 case 18: // ncp: no ncps available
2998 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2999 disc_reason
= "NCP: no NCPs available";
3001 case 19: // ncp: failure to converge on acceptable address
3002 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3003 disc_reason
= (dir
== 1)
3004 ? "NCP: too many Configure-Naks received from peer"
3005 : "NCP: too many Configure-Naks sent to peer";
3007 case 20: // ncp: user not permitted to use any address
3008 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
3009 disc_reason
= (dir
== 1)
3010 ? "NCP: local link address not acceptable to peer"
3011 : "NCP: remote link address not acceptable";
3018 static char e
[] = "unknown AVP 0xXXXX";
3019 LOG(2, s
, t
, " Unknown AVP type %u\n", mtype
);
3021 result
= 2; // general error
3022 error
= 8; // unknown mandatory AVP
3023 sprintf((msg
= e
) + 14, "%04x", mtype
);
3030 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
3034 case 1: // SCCRQ - Start Control Connection Request
3035 tunnel
[t
].state
= TUNNELOPENING
;
3036 LOG(3, s
, t
, "Received SCCRQ\n");
3037 if (main_quit
!= QUIT_SHUTDOWN
)
3039 LOG(3, s
, t
, "sending SCCRP\n");
3040 controlt
*c
= controlnew(2); // sending SCCRP
3041 control16(c
, 2, version
, 1); // protocol version
3042 control32(c
, 3, 3, 1); // framing
3043 controls(c
, 7, hostname
, 1); // host name
3044 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
3045 control16(c
, 9, t
, 1); // assigned tunnel
3046 controladd(c
, 0, t
); // send the resply
3050 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
3054 tunnel
[t
].state
= TUNNELOPEN
;
3055 tunnel
[t
].lastrec
= time_now
;
3057 LOG(3, s
, t
, "Received SCCRP\n");
3058 if (main_quit
!= QUIT_SHUTDOWN
)
3060 if (tunnel
[t
].isremotelns
&& chapresponse
)
3064 lac_calc_rlns_auth(t
, 2, hash
); // id = 2 (SCCRP)
3065 // check authenticator
3066 if (memcmp(hash
, chapresponse
, 16) == 0)
3068 LOG(3, s
, t
, "sending SCCCN to REMOTE LNS\n");
3069 controlt
*c
= controlnew(3); // sending SCCCN
3070 controls(c
, 7, hostname
, 1); // host name
3071 controls(c
, 8, Vendor_name
, 1); // Vendor name
3072 control16(c
, 2, version
, 1); // protocol version
3073 control32(c
, 3, 3, 1); // framing Capabilities
3074 control16(c
, 9, t
, 1); // assigned tunnel
3075 controladd(c
, 0, t
); // send
3079 tunnelshutdown(t
, "Bad chap response from REMOTE LNS", 4, 0, 0);
3085 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
3090 LOG(3, s
, t
, "Received SCCN\n");
3091 tunnel
[t
].state
= TUNNELOPEN
;
3092 tunnel
[t
].lastrec
= time_now
;
3093 controlnull(t
); // ack
3096 LOG(3, s
, t
, "Received StopCCN\n");
3097 controlnull(t
); // ack
3098 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
3101 LOG(3, s
, t
, "Received HELLO\n");
3102 controlnull(t
); // simply ACK
3106 LOG(3, s
, t
, "Received OCRQ\n");
3110 LOG(3, s
, t
, "Received OCRO\n");
3114 LOG(3, s
, t
, "Received OCCN\n");
3117 LOG(3, s
, t
, "Received ICRQ\n");
3118 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
3120 controlt
*c
= controlnew(11); // ICRP
3122 LOG(3, s
, t
, "Sending ICRP\n");
3125 sessionfree
= session
[s
].next
;
3126 memset(&session
[s
], 0, sizeof(session
[s
]));
3128 if (s
> config
->cluster_highest_sessionid
)
3129 config
->cluster_highest_sessionid
= s
;
3131 session
[s
].opened
= time_now
;
3132 session
[s
].tunnel
= t
;
3133 session
[s
].far
= asession
;
3134 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3135 LOG(3, s
, t
, "New session (%u/%u)\n", tunnel
[t
].far
, session
[s
].far
);
3136 control16(c
, 14, s
, 1); // assigned session
3137 controladd(c
, asession
, t
); // send the reply
3139 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
3140 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
3142 session
[s
].ppp
.phase
= Establish
;
3143 session
[s
].ppp
.lcp
= Starting
;
3145 STAT(session_created
);
3150 controlt
*c
= controlnew(14); // CDN
3151 LOG(3, s
, t
, "Sending CDN\n");
3154 STAT(session_overflow
);
3155 LOG(1, 0, t
, "No free sessions\n");
3156 control16(c
, 1, 4, 0); // temporary lack of resources
3159 control16(c
, 1, 2, 7); // shutting down, try another
3161 controladd(c
, asession
, t
); // send the message
3166 LOG(3, s
, t
, "Received ICRP\n");
3167 if (session
[s
].forwardtosession
)
3169 controlt
*c
= controlnew(12); // ICCN
3171 session
[s
].opened
= time_now
;
3172 session
[s
].tunnel
= t
;
3173 session
[s
].far
= asession
;
3174 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3176 control32(c
, 19, 1, 1); // Framing Type
3177 control32(c
, 24, 10000000, 1); // Tx Connect Speed
3178 controladd(c
, asession
, t
); // send the message
3179 LOG(3, s
, t
, "Sending ICCN\n");
3184 LOG(3, s
, t
, "Received ICCN\n");
3185 if (amagic
== 0) amagic
= time_now
;
3186 session
[s
].magic
= amagic
; // set magic number
3187 session
[s
].flags
= aflags
; // set flags received
3188 session
[s
].mru
= PPPoE_MRU
; // default
3189 controlnull(t
); // ack
3192 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
3193 sess_local
[s
].ppp_mru
= MRU
;
3195 // Set multilink options before sending initial LCP packet
3196 sess_local
[s
].mp_mrru
= 1614;
3197 sess_local
[s
].mp_epdis
= ntohl(config
->iftun_address
? config
->iftun_address
: my_address
);
3200 change_state(s
, lcp
, RequestSent
);
3204 LOG(3, s
, t
, "Received CDN\n");
3205 controlnull(t
); // ack
3206 sessionshutdown(s
, disc_reason
, CDN_NONE
, disc_cause
);
3209 LOG(1, s
, t
, "Missing message type\n");
3212 STAT(tunnel_rx_errors
);
3214 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
3216 LOG(1, s
, t
, "Unknown message type %u\n", message
);
3219 if (chapresponse
) free(chapresponse
);
3220 cluster_send_tunnel(t
);
3224 LOG(4, s
, t
, " Got a ZLB ack\n");
3231 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
3232 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
3233 { // HDLC address header, discard
3239 LOG(1, s
, t
, "Short ppp length %d\n", l
);
3240 STAT(tunnel_rx_errors
);
3250 proto
= ntohs(*(uint16_t *) p
);
3256 if (session
[s
].forwardtosession
)
3258 LOG(5, s
, t
, "Forwarding data session to session %u\n", session
[s
].forwardtosession
);
3259 // Forward to LAC/BAS or Remote LNS session
3260 lac_session_forward(buf
, len
, s
, proto
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3263 else if (config
->auth_tunnel_change_addr_src
)
3265 if (tunnel
[t
].ip
!= ntohl(addr
->sin_addr
.s_addr
) &&
3266 tunnel
[t
].port
== ntohs(addr
->sin_port
))
3268 // The remotes BAS are a clustered l2tpns server and the source IP has changed
3269 LOG(5, s
, t
, "The tunnel IP source (%s) has changed by new IP (%s)\n",
3270 fmtaddr(htonl(tunnel
[t
].ip
), 0), fmtaddr(addr
->sin_addr
.s_addr
, 0));
3272 tunnel
[t
].ip
= ntohl(addr
->sin_addr
.s_addr
);
3277 if (s
&& !session
[s
].opened
) // Is something wrong??
3279 if (!config
->cluster_iam_master
)
3281 // Pass it off to the master to deal with..
3282 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3286 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
3287 STAT(tunnel_rx_errors
);
3291 if (proto
== PPPPAP
)
3293 session
[s
].last_packet
= time_now
;
3294 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3295 processpap(s
, t
, p
, l
);
3297 else if (proto
== PPPCHAP
)
3299 session
[s
].last_packet
= time_now
;
3300 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3301 processchap(s
, t
, p
, l
);
3303 else if (proto
== PPPLCP
)
3305 session
[s
].last_packet
= time_now
;
3306 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3307 processlcp(s
, t
, p
, l
);
3309 else if (proto
== PPPIPCP
)
3311 session
[s
].last_packet
= time_now
;
3312 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3313 processipcp(s
, t
, p
, l
);
3315 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
3317 session
[s
].last_packet
= time_now
;
3318 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3319 processipv6cp(s
, t
, p
, l
);
3321 else if (proto
== PPPCCP
)
3323 session
[s
].last_packet
= time_now
;
3324 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3325 processccp(s
, t
, p
, l
);
3327 else if (proto
== PPPIP
)
3331 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3332 return; // closing session, PPP not processed
3335 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3336 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3338 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3342 processipin(s
, t
, p
, l
);
3344 else if (proto
== PPPMP
)
3348 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3349 return; // closing session, PPP not processed
3352 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3353 if (!config
->cluster_iam_master
)
3355 // The fragments reconstruction is managed by the Master.
3356 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3360 processmpin(s
, t
, p
, l
);
3362 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
3366 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3367 return; // closing session, PPP not processed
3370 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3371 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3373 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3377 processipv6in(s
, t
, p
, l
);
3379 else if (session
[s
].ppp
.lcp
== Opened
)
3381 session
[s
].last_packet
= time_now
;
3382 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3383 protoreject(s
, t
, p
, l
, proto
);
3387 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3388 proto
, ppp_state(session
[s
].ppp
.lcp
));
3393 // read and process packet on tun
3394 // (i.e. this routine writes to buf[-8]).
3395 static void processtun(uint8_t * buf
, int len
)
3397 LOG_HEX(5, "Receive TUN Data", buf
, len
);
3398 STAT(tun_rx_packets
);
3399 INC_STAT(tun_rx_bytes
, len
);
3407 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
3408 STAT(tun_rx_errors
);
3412 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
3413 processipout(buf
, len
);
3414 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
3415 && config
->ipv6_prefix
.s6_addr
[0])
3416 processipv6out(buf
, len
);
3421 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3422 // that we look at the whole of the tunnel, radius and session tables
3424 static void regular_cleanups(double period
)
3426 // Next tunnel, radius and session to check for actions on.
3427 static tunnelidt t
= 0;
3429 static sessionidt s
= 0;
3442 // divide up tables into slices based on the last run
3443 t_slice
= config
->cluster_highest_tunnelid
* period
;
3444 r_slice
= (MAXRADIUS
- 1) * period
;
3445 s_slice
= config
->cluster_highest_sessionid
* period
;
3449 else if (t_slice
> config
->cluster_highest_tunnelid
)
3450 t_slice
= config
->cluster_highest_tunnelid
;
3454 else if (r_slice
> (MAXRADIUS
- 1))
3455 r_slice
= MAXRADIUS
- 1;
3459 else if (s_slice
> config
->cluster_highest_sessionid
)
3460 s_slice
= config
->cluster_highest_sessionid
;
3462 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
3464 for (i
= 0; i
< t_slice
; i
++)
3467 if (t
> config
->cluster_highest_tunnelid
)
3470 if (t
== TUNNEL_ID_PPPOE
)
3473 // check for expired tunnels
3474 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
3476 STAT(tunnel_timeout
);
3477 tunnelkill(t
, "Expired");
3481 // check for message resend
3482 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
3484 // resend pending messages as timeout on reply
3485 if (tunnel
[t
].retry
<= TIME
)
3487 controlt
*c
= tunnel
[t
].controls
;
3488 uint16_t w
= tunnel
[t
].window
;
3489 tunnel
[t
].try++; // another try
3490 if (tunnel
[t
].try > 5)
3491 tunnelkill(t
, "Timeout on control message"); // game over
3495 tunnelsend(c
->buf
, c
->length
, t
);
3503 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
3505 if (!config
->disable_sending_hello
)
3507 controlt
*c
= controlnew(6); // sending HELLO
3508 controladd(c
, 0, t
); // send the message
3509 LOG(3, 0, t
, "Sending HELLO message\n");
3514 // Check for tunnel changes requested from the CLI
3515 if ((a
= cli_tunnel_actions
[t
].action
))
3517 cli_tunnel_actions
[t
].action
= 0;
3518 if (a
& CLI_TUN_KILL
)
3520 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
3521 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
3527 for (i
= 0; i
< r_slice
; i
++)
3533 if (!radius
[r
].state
)
3536 if (radius
[r
].retry
<= TIME
)
3543 for (i
= 0; i
< s_slice
; i
++)
3546 if (s
> config
->cluster_highest_sessionid
)
3549 if (!session
[s
].opened
) // Session isn't in use
3552 // check for expired sessions
3555 if (session
[s
].die
<= TIME
)
3557 sessionkill(s
, "Expired");
3564 if (sess_local
[s
].lcp
.restart
<= time_now
)
3566 int next_state
= session
[s
].ppp
.lcp
;
3567 switch (session
[s
].ppp
.lcp
)
3571 next_state
= RequestSent
;
3574 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
3576 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
3577 sendlcp(s
, session
[s
].tunnel
);
3578 change_state(s
, lcp
, next_state
);
3582 sessionshutdown(s
, "No response to LCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3583 STAT(session_timeout
);
3593 if (sess_local
[s
].ipcp
.restart
<= time_now
)
3595 int next_state
= session
[s
].ppp
.ipcp
;
3596 switch (session
[s
].ppp
.ipcp
)
3600 next_state
= RequestSent
;
3603 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
3605 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
3606 sendipcp(s
, session
[s
].tunnel
);
3607 change_state(s
, ipcp
, next_state
);
3611 sessionshutdown(s
, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3612 STAT(session_timeout
);
3622 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
3624 int next_state
= session
[s
].ppp
.ipv6cp
;
3625 switch (session
[s
].ppp
.ipv6cp
)
3629 next_state
= RequestSent
;
3632 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
3634 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
3635 sendipv6cp(s
, session
[s
].tunnel
);
3636 change_state(s
, ipv6cp
, next_state
);
3640 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
3641 change_state(s
, ipv6cp
, Stopped
);
3648 if (sess_local
[s
].ccp
.restart
<= time_now
)
3650 int next_state
= session
[s
].ppp
.ccp
;
3651 switch (session
[s
].ppp
.ccp
)
3655 next_state
= RequestSent
;
3658 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
3660 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
3661 sendccp(s
, session
[s
].tunnel
);
3662 change_state(s
, ccp
, next_state
);
3666 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
3667 change_state(s
, ccp
, Stopped
);
3674 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3675 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= config
->idle_echo_timeout
))
3677 sessionshutdown(s
, "No response to LCP ECHO requests.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3678 STAT(session_timeout
);
3683 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3684 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= config
->echo_timeout
) &&
3685 (time_now
- sess_local
[s
].last_echo
>= ECHO_TIMEOUT
))
3687 uint8_t b
[MAXETHER
];
3689 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
, 1, 0, 0);
3693 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
3694 *(uint16_t *)(q
+ 2) = htons(8); // Length
3695 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
3697 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
3698 (int)(time_now
- session
[s
].last_packet
));
3700 tunnelsend(b
, (q
- b
) + 8, session
[s
].tunnel
); // send it
3701 sess_local
[s
].last_echo
= time_now
;
3705 // Drop sessions who have reached session_timeout seconds
3706 if (session
[s
].session_timeout
)
3708 bundleidt bid
= session
[s
].bundle
;
3711 if (time_now
- bundle
[bid
].last_check
>= 1)
3713 bundle
[bid
].online_time
+= (time_now
- bundle
[bid
].last_check
) * bundle
[bid
].num_of_links
;
3714 bundle
[bid
].last_check
= time_now
;
3715 if (bundle
[bid
].online_time
>= session
[s
].session_timeout
)
3718 for (ses
= bundle
[bid
].num_of_links
- 1; ses
>= 0; ses
--)
3720 sessionshutdown(bundle
[bid
].members
[ses
], "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3727 else if (time_now
- session
[s
].opened
>= session
[s
].session_timeout
)
3729 sessionshutdown(s
, "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3735 // Drop sessions who have reached idle_timeout seconds
3736 if (session
[s
].last_data
&& session
[s
].idle_timeout
&& (time_now
- session
[s
].last_data
>= session
[s
].idle_timeout
))
3738 sessionshutdown(s
, "Idle Timeout Reached", CDN_ADMIN_DISC
, TERM_IDLE_TIMEOUT
);
3739 STAT(session_timeout
);
3744 // Check for actions requested from the CLI
3745 if ((a
= cli_session_actions
[s
].action
))
3749 cli_session_actions
[s
].action
= 0;
3750 if (a
& CLI_SESS_KILL
)
3752 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
3753 sessionshutdown(s
, "Requested by administrator.", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
3754 a
= 0; // dead, no need to check for other actions
3758 if (a
& CLI_SESS_NOSNOOP
)
3760 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
3761 session
[s
].snoop_ip
= 0;
3762 session
[s
].snoop_port
= 0;
3766 else if (a
& CLI_SESS_SNOOP
)
3768 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%u)\n",
3769 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
3770 cli_session_actions
[s
].snoop_port
);
3772 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
3773 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
3778 if (a
& CLI_SESS_NOTHROTTLE
)
3780 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
3781 throttle_session(s
, 0, 0);
3785 else if (a
& CLI_SESS_THROTTLE
)
3787 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3788 cli_session_actions
[s
].throttle_in
,
3789 cli_session_actions
[s
].throttle_out
);
3791 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3796 if (a
& CLI_SESS_NOFILTER
)
3798 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3799 filter_session(s
, 0, 0);
3803 else if (a
& CLI_SESS_FILTER
)
3805 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3806 cli_session_actions
[s
].filter_in
,
3807 cli_session_actions
[s
].filter_out
);
3809 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3815 cluster_send_session(s
);
3818 // RADIUS interim accounting
3819 if (config
->radius_accounting
&& config
->radius_interim
> 0
3820 && session
[s
].ip
&& !session
[s
].walled_garden
3821 && !sess_local
[s
].radius
// RADIUS already in progress
3822 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
3823 && session
[s
].flags
& SESSION_STARTED
)
3825 int rad
= radiusnew(s
);
3828 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3829 STAT(radius_overflow
);
3833 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3834 session
[s
].user
, session
[s
].unique_id
);
3836 radiussend(rad
, RADIUSINTERIM
);
3837 sess_local
[s
].last_interim
= time_now
;
3842 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3843 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3847 // Are we in the middle of a tunnel update, or radius
3850 static int still_busy(void)
3853 static clockt last_talked
= 0;
3854 static clockt start_busy_wait
= 0;
3857 static time_t stopped_bgp
= 0;
3862 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3864 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3865 if (bgp_peers
[i
].state
== Established
)
3866 bgp_stop(&bgp_peers
[i
]);
3868 stopped_bgp
= time_now
;
3870 if (!config
->cluster_iam_master
)
3872 // we don't want to become master
3873 cluster_send_ping(0);
3879 if (!config
->cluster_iam_master
&& time_now
< (stopped_bgp
+ QUIT_DELAY
))
3884 if (!config
->cluster_iam_master
)
3887 if (main_quit
== QUIT_SHUTDOWN
)
3889 static int dropped
= 0;
3894 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3895 for (i
= 1; i
< MAXTUNNEL
; i
++)
3896 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3897 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3903 if (start_busy_wait
== 0)
3904 start_busy_wait
= TIME
;
3906 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3908 if (!tunnel
[i
].controlc
)
3911 if (last_talked
!= TIME
)
3913 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i
);
3919 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3920 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3922 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3926 for (i
= 1; i
< MAXRADIUS
; i
++)
3928 if (radius
[i
].state
== RADIUSNULL
)
3930 if (radius
[i
].state
== RADIUSWAIT
)
3933 if (last_talked
!= TIME
)
3935 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i
, radius
[i
].session
);
3945 # include <sys/epoll.h>
3947 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3948 # include "fake_epoll.h"
3952 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac, pppoedisc, pppoesess
3955 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, pppoedisc, pppoesess
3959 // additional polled fds
3961 # define EXTRA_FDS BGP_NUM_PEERS
3963 # define EXTRA_FDS 0
3966 // main loop - gets packets on tun or udp and processes them
3967 static void mainloop(void)
3971 uint8_t *p
= buf
+ 32; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3972 // and the forwarded pppoe session
3973 int size_bufp
= sizeof(buf
) - 32;
3974 clockt next_cluster_ping
= 0; // send initial ping immediately
3975 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3976 int maxevent
= sizeof(events
)/sizeof(*events
);
3978 if ((epollfd
= epoll_create(maxevent
)) < 0)
3980 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3985 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",
3986 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
, nlfd
, udplacfd
, pppoediscfd
, pppoesessfd
);
3988 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d, pppoefd=%d, pppoesessfd=%d\n",
3989 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
, nlfd
, pppoediscfd
, pppoesessfd
);
3992 /* setup our fds to poll for input */
3994 static struct event_data d
[BASE_FDS
];
3995 struct epoll_event e
;
4002 d
[i
].type
= FD_TYPE_CLI
;
4003 e
.data
.ptr
= &d
[i
++];
4004 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
4007 d
[i
].type
= FD_TYPE_CLUSTER
;
4008 e
.data
.ptr
= &d
[i
++];
4009 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
4011 d
[i
].type
= FD_TYPE_TUN
;
4012 e
.data
.ptr
= &d
[i
++];
4013 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
4015 d
[i
].type
= FD_TYPE_UDP
;
4016 e
.data
.ptr
= &d
[i
++];
4017 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
4019 d
[i
].type
= FD_TYPE_CONTROL
;
4020 e
.data
.ptr
= &d
[i
++];
4021 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
4023 d
[i
].type
= FD_TYPE_DAE
;
4024 e
.data
.ptr
= &d
[i
++];
4025 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
4027 d
[i
].type
= FD_TYPE_NETLINK
;
4028 e
.data
.ptr
= &d
[i
++];
4029 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, nlfd
, &e
);
4032 d
[i
].type
= FD_TYPE_UDPLAC
;
4033 e
.data
.ptr
= &d
[i
++];
4034 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udplacfd
, &e
);
4037 d
[i
].type
= FD_TYPE_PPPOEDISC
;
4038 e
.data
.ptr
= &d
[i
++];
4039 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoediscfd
, &e
);
4041 d
[i
].type
= FD_TYPE_PPPOESESS
;
4042 e
.data
.ptr
= &d
[i
++];
4043 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoesessfd
, &e
);
4047 signal(SIGPIPE
, SIG_IGN
);
4048 bgp_setup(config
->as_number
);
4049 if (config
->bind_address
)
4050 bgp_add_route(config
->bind_address
, 0xffffffff);
4052 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
4054 if (config
->neighbour
[i
].name
[0])
4055 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
4056 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
4057 config
->neighbour
[i
].hold
, config
->neighbour
[i
].update_source
,
4058 0); /* 0 = routing disabled */
4062 while (!main_quit
|| still_busy())
4072 config
->reload_config
++;
4075 if (config
->reload_config
)
4077 config
->reload_config
= 0;
4085 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
4086 STAT(select_called
);
4091 if (errno
== EINTR
||
4092 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
4095 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
4101 struct sockaddr_in addr
;
4102 struct in_addr local
;
4107 int udplac_ready
= 0;
4108 int udplac_pkts
= 0;
4110 int pppoesess_ready
= 0;
4111 int pppoesess_pkts
= 0;
4113 int cluster_ready
= 0;
4116 int cluster_pkts
= 0;
4118 uint32_t bgp_events
[BGP_NUM_PEERS
];
4119 memset(bgp_events
, 0, sizeof(bgp_events
));
4122 for (c
= n
, i
= 0; i
< c
; i
++)
4124 struct event_data
*d
= events
[i
].data
.ptr
;
4128 case FD_TYPE_CLI
: // CLI connections
4132 alen
= sizeof(addr
);
4133 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
4139 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
4145 // these are handled below, with multiple interleaved reads
4146 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
4147 case FD_TYPE_TUN
: tun_ready
++; break;
4148 case FD_TYPE_UDP
: udp_ready
++; break;
4150 case FD_TYPE_UDPLAC
: udplac_ready
++; break;
4152 case FD_TYPE_PPPOESESS
: pppoesess_ready
++; break;
4154 case FD_TYPE_PPPOEDISC
: // pppoe discovery
4155 s
= read(pppoediscfd
, p
, size_bufp
);
4156 if (s
> 0) process_pppoe_disc(p
, s
);
4160 case FD_TYPE_CONTROL
: // nsctl commands
4161 alen
= sizeof(addr
);
4162 s
= recvfromto(controlfd
, p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4163 if (s
> 0) processcontrol(p
, s
, &addr
, alen
, &local
);
4167 case FD_TYPE_DAE
: // DAE requests
4168 alen
= sizeof(addr
);
4169 s
= recvfromto(daefd
, p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4170 if (s
> 0) processdae(p
, s
, &addr
, alen
, &local
);
4174 case FD_TYPE_RADIUS
: // RADIUS response
4175 alen
= sizeof(addr
);
4176 s
= recvfrom(radfds
[d
->index
], p
, size_bufp
, MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
4177 if (s
>= 0 && config
->cluster_iam_master
)
4179 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
4180 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
4181 processrad(p
, s
, d
->index
);
4183 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4184 fmtaddr(addr
.sin_addr
.s_addr
, 0));
4192 bgp_events
[d
->index
] = events
[i
].events
;
4197 case FD_TYPE_NETLINK
:
4199 struct nlmsghdr
*nh
= (struct nlmsghdr
*)p
;
4200 s
= netlink_recv(p
, size_bufp
);
4201 if (nh
->nlmsg_type
== NLMSG_ERROR
)
4203 struct nlmsgerr
*errmsg
= NLMSG_DATA(nh
);
4206 if (errmsg
->msg
.nlmsg_seq
< min_initok_nlseqnum
)
4208 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg
[nh
->nlmsg_seq
], strerror(-errmsg
->error
));
4213 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg
->error
));
4218 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
);
4224 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
4229 bgp_process(bgp_events
);
4232 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
4237 alen
= sizeof(addr
);
4238 if ((s
= recvfrom(udpfd
, p
, size_bufp
, 0, (void *) &addr
, &alen
)) > 0)
4240 processudp(p
, s
, &addr
);
4253 alen
= sizeof(addr
);
4254 if ((s
= recvfrom(udplacfd
, p
, size_bufp
, 0, (void *) &addr
, &alen
)) > 0)
4256 if (!config
->disable_lac_func
)
4257 processudp(p
, s
, &addr
);
4271 if ((s
= read(tunfd
, p
, size_bufp
)) > 0)
4284 if (pppoesess_ready
)
4286 if ((s
= read(pppoesessfd
, p
, size_bufp
)) > 0)
4288 process_pppoe_sess(p
, s
);
4293 pppoesess_ready
= 0;
4301 alen
= sizeof(addr
);
4302 if ((s
= recvfrom(cluster_sockfd
, p
, size_bufp
, MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
4304 processcluster(p
, s
, addr
.sin_addr
.s_addr
);
4315 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
4316 STAT(multi_read_used
);
4318 if (c
>= config
->multi_read_count
)
4321 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster %d rmlns and %d pppoe packets\n",
4322 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
, udplac_pkts
, pppoesess_pkts
);
4324 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d pppoe packets\n",
4325 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
, pppoesess_pkts
);
4327 STAT(multi_read_exceeded
);
4333 /* no event received, but timers could still have expired */
4334 bgp_process_peers_timers();
4339 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
4341 // Log current traffic stats
4342 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4343 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4344 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
4345 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
4346 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
4348 udp_tx
= udp_rx
= 0;
4349 udp_rx_pkt
= eth_rx_pkt
= 0;
4350 eth_tx
= eth_rx
= 0;
4353 if (config
->dump_speed
)
4354 printf("%s\n", config
->bandwidth
);
4356 // Update the internal time counter
4357 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4361 struct param_timer p
= { time_now
};
4362 run_plugins(PLUGIN_TIMER
, &p
);
4366 // Runs on every machine (master and slaves).
4367 if (next_cluster_ping
<= TIME
)
4369 // Check to see which of the cluster is still alive..
4371 cluster_send_ping(basetime
); // Only does anything if we're a slave
4372 cluster_check_master(); // ditto.
4374 cluster_heartbeat(); // Only does anything if we're a master.
4375 cluster_check_slaves(); // ditto.
4377 master_update_counts(); // If we're a slave, send our byte counters to our master.
4379 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
4380 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
4382 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
4385 if (!config
->cluster_iam_master
)
4388 // Run token bucket filtering queue..
4389 // Only run it every 1/10th of a second.
4391 static clockt last_run
= 0;
4392 if (last_run
!= TIME
)
4399 // Handle timeouts, retries etc.
4401 static double last_clean
= 0;
4405 TIME
= now(&this_clean
);
4406 diff
= this_clean
- last_clean
;
4408 // Run during idle time (after we've handled
4409 // all incoming packets) or every 1/10th sec
4410 if (!more
|| diff
> 0.1)
4412 regular_cleanups(diff
);
4413 last_clean
= this_clean
;
4417 if (*config
->accounting_dir
)
4419 static clockt next_acct
= 0;
4420 static clockt next_shut_acct
= 0;
4422 if (next_acct
<= TIME
)
4424 // Dump accounting data
4425 next_acct
= TIME
+ ACCT_TIME
;
4426 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4429 else if (next_shut_acct
<= TIME
)
4431 // Dump accounting data for shutdown sessions
4432 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4439 // Are we the master and shutting down??
4440 if (config
->cluster_iam_master
)
4441 cluster_heartbeat(); // Flush any queued changes..
4443 // Ok. Notify everyone we're shutting down. If we're
4444 // the master, this will force an election.
4445 cluster_send_ping(0);
4448 // Important!!! We MUST not process any packets past this point!
4449 LOG(1, 0, 0, "Shutdown complete\n");
4452 static void stripdomain(char *host
)
4456 if ((p
= strchr(host
, '.')))
4462 FILE *resolv
= fopen("/etc/resolv.conf", "r");
4468 while (fgets(buf
, sizeof(buf
), resolv
))
4470 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
4473 if (!isspace(buf
[6]))
4477 while (isspace(*b
)) b
++;
4482 while (*b
&& !isspace(*b
)) b
++;
4484 if (buf
[0] == 'd') // domain is canonical
4490 // first search line
4493 // hold, may be subsequent domain line
4494 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
4505 int hl
= strlen(host
);
4506 int dl
= strlen(domain
);
4507 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
4508 host
[hl
-dl
- 1] = 0;
4512 *p
= 0; // everything after first dot
4517 // Init data structures
4518 static void initdata(int optdebug
, char *optconfig
)
4522 if (!(config
= shared_malloc(sizeof(configt
))))
4524 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
4528 memset(config
, 0, sizeof(configt
));
4529 time(&config
->start_time
);
4530 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
4531 config
->debug
= optdebug
;
4532 config
->num_tbfs
= MAXTBFS
;
4533 config
->rl_rate
= 28; // 28kbps
4534 config
->cluster_mcast_ttl
= 1;
4535 config
->cluster_master_min_adv
= 1;
4536 config
->ppp_restart_time
= 3;
4537 config
->ppp_max_configure
= 10;
4538 config
->ppp_max_failure
= 5;
4539 config
->kill_timedout_sessions
= 1;
4540 strcpy(config
->random_device
, RANDOMDEVICE
);
4541 // Set default value echo_timeout and idle_echo_timeout
4542 config
->echo_timeout
= ECHO_TIMEOUT
;
4543 config
->idle_echo_timeout
= IDLE_ECHO_TIMEOUT
;
4545 log_stream
= stderr
;
4548 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
4550 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
4553 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
4556 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
4558 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
4561 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
4563 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
4566 if (!(bundle
= shared_malloc(sizeof(bundlet
) * MAXBUNDLE
)))
4568 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno
));
4571 if (!(frag
= shared_malloc(sizeof(fragmentationt
) * MAXBUNDLE
)))
4573 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno
));
4576 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
4578 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
4582 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
4584 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
4588 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
4590 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
4594 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
4596 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
4600 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
4602 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
4605 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
4607 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
4609 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
4612 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
4614 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
4616 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
4619 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
4621 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
4622 memset(bundle
, 0, sizeof(bundlet
) * MAXBUNDLE
);
4623 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
4624 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
4625 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
4627 // Put all the sessions on the free list marked as undefined.
4628 for (i
= 1; i
< MAXSESSION
; i
++)
4630 session
[i
].next
= i
+ 1;
4631 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
4633 session
[MAXSESSION
- 1].next
= 0;
4636 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4637 for (i
= 1; i
< MAXTUNNEL
; i
++)
4638 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
4640 for (i
= 1; i
< MAXBUNDLE
; i
++) {
4641 bundle
[i
].state
= BUNDLEUNDEF
;
4646 // Grab my hostname unless it's been specified
4647 gethostname(hostname
, sizeof(hostname
));
4648 stripdomain(hostname
);
4651 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
4654 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
4656 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
4662 lac_initremotelnsdata();
4666 static int assign_ip_address(sessionidt s
)
4670 time_t best_time
= time_now
;
4671 char *u
= session
[s
].user
;
4675 CSTAT(assign_ip_address
);
4677 for (i
= 1; i
< ip_pool_size
; i
++)
4679 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
4682 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
4689 if (ip_address_pool
[i
].last
< best_time
)
4692 if (!(best_time
= ip_address_pool
[i
].last
))
4693 break; // never used, grab this one
4699 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
4703 session
[s
].ip
= ip_address_pool
[best
].address
;
4704 session
[s
].ip_pool_index
= best
;
4705 ip_address_pool
[best
].assigned
= 1;
4706 ip_address_pool
[best
].last
= time_now
;
4707 ip_address_pool
[best
].session
= s
;
4708 if (session
[s
].walled_garden
)
4709 /* Don't track addresses of users in walled garden (note: this
4710 means that their address isn't "sticky" even if they get
4712 ip_address_pool
[best
].user
[0] = 0;
4714 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
4717 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
4718 reuse
? "Reusing" : "Allocating", best
);
4723 static void free_ip_address(sessionidt s
)
4725 int i
= session
[s
].ip_pool_index
;
4728 CSTAT(free_ip_address
);
4731 return; // what the?
4733 if (i
< 0) // Is this actually part of the ip pool?
4737 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
4739 ip_address_pool
[i
].assigned
= 0;
4740 ip_address_pool
[i
].session
= 0;
4741 ip_address_pool
[i
].last
= time_now
;
4745 // Fsck the address pool against the session table.
4746 // Normally only called when we become a master.
4748 // This isn't perfect: We aren't keep tracking of which
4749 // users used to have an IP address.
4751 void rebuild_address_pool(void)
4756 // Zero the IP pool allocation, and build
4757 // a map from IP address to pool index.
4758 for (i
= 1; i
< MAXIPPOOL
; ++i
)
4760 ip_address_pool
[i
].assigned
= 0;
4761 ip_address_pool
[i
].session
= 0;
4762 if (!ip_address_pool
[i
].address
)
4765 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
4768 for (i
= 0; i
< MAXSESSION
; ++i
)
4771 if (!(session
[i
].opened
&& session
[i
].ip
))
4774 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
4776 if (session
[i
].ip_pool_index
< 0)
4778 // Not allocated out of the pool.
4779 if (ipid
< 1) // Not found in the pool either? good.
4782 LOG(0, i
, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4783 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
4785 // Fall through and process it as part of the pool.
4789 if (ipid
> MAXIPPOOL
|| ipid
< 0)
4791 LOG(0, i
, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
4793 session
[i
].ip_pool_index
= ipid
;
4797 ip_address_pool
[ipid
].assigned
= 1;
4798 ip_address_pool
[ipid
].session
= i
;
4799 ip_address_pool
[ipid
].last
= time_now
;
4800 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4801 session
[i
].ip_pool_index
= ipid
;
4802 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
4807 // Fix the address pool to match a changed session.
4808 // (usually when the master sends us an update).
4809 static void fix_address_pool(int sid
)
4813 ipid
= session
[sid
].ip_pool_index
;
4815 if (ipid
> ip_pool_size
)
4816 return; // Ignore it. rebuild_address_pool will fix it up.
4818 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
4819 return; // Just ignore it. rebuild_address_pool will take care of it.
4821 ip_address_pool
[ipid
].assigned
= 1;
4822 ip_address_pool
[ipid
].session
= sid
;
4823 ip_address_pool
[ipid
].last
= time_now
;
4824 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4828 // Add a block of addresses to the IP pool to hand out.
4830 static void add_to_ip_pool(in_addr_t addr
, int prefixlen
)
4834 prefixlen
= 32; // Host route only.
4836 addr
&= 0xffffffff << (32 - prefixlen
);
4838 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
4841 for (i
= addr
; i
< addr
+(1<<(32-prefixlen
)); ++i
)
4843 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
4844 continue; // Skip 0 and broadcast addresses.
4846 ip_address_pool
[ip_pool_size
].address
= i
;
4847 ip_address_pool
[ip_pool_size
].assigned
= 0;
4849 if (ip_pool_size
>= MAXIPPOOL
)
4851 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
4857 // Initialize the IP address pool
4858 static void initippool()
4863 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
4865 if (!(f
= fopen(IPPOOLFILE
, "r")))
4867 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
4871 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
4874 buf
[4095] = 0; // Force it to be zero terminated/
4876 if (*buf
== '#' || *buf
== '\n')
4877 continue; // Skip comments / blank lines
4878 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
4879 if ((p
= (char *)strchr(buf
, ':')))
4883 src
= inet_addr(buf
);
4884 if (src
== INADDR_NONE
)
4886 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
4889 // This entry is for a specific IP only
4890 if (src
!= config
->bind_address
)
4895 if ((p
= (char *)strchr(pool
, '/')))
4899 in_addr_t start
= 0;
4901 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
4903 if (!*p
|| !(numbits
= atoi(p
)))
4905 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
4908 start
= ntohl(inet_addr(pool
));
4910 // Add a static route for this pool
4911 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4912 fmtaddr(htonl(start
), 0), numbits
);
4914 routeset(0, start
, numbits
, 0, 1);
4916 add_to_ip_pool(start
, numbits
);
4920 // It's a single ip address
4921 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
4925 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
4928 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
4930 struct sockaddr_in snoop_addr
= {0};
4931 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
4934 snoop_addr
.sin_family
= AF_INET
;
4935 snoop_addr
.sin_addr
.s_addr
= destination
;
4936 snoop_addr
.sin_port
= ntohs(port
);
4938 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size
,
4939 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
4940 htons(snoop_addr
.sin_port
));
4942 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
4943 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
4945 STAT(packets_snooped
);
4948 static int dump_session(FILE **f
, sessiont
*s
)
4951 if (!s
->opened
|| (!s
->ip
&& !s
->forwardtosession
) || !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4953 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4959 char filename
[1024];
4961 time_t now
= time(NULL
);
4963 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4964 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4966 if (!(*f
= fopen(filename
, "w")))
4968 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
4972 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
4973 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
4978 "# format: username ip qos uptxoctets downrxoctets\n",
4980 fmtaddr(config
->iftun_address
? config
->iftun_address
: my_address
, 0),
4985 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
4986 fprintf(*f
, "%s %s %d %u %u\n",
4987 s
->user
, // username
4988 fmtaddr(htonl(s
->ip
), 0), // ip
4989 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
4990 (uint32_t) s
->cin_delta
, // uptxoctets
4991 (uint32_t) s
->cout_delta
); // downrxoctets
4993 s
->cin_delta
= s
->cout_delta
= 0;
4998 static void dump_acct_info(int all
)
5004 CSTAT(dump_acct_info
);
5008 for (i
= 0; i
< shut_acct_n
; i
++)
5009 dump_session(&f
, &shut_acct
[i
]);
5015 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5016 dump_session(&f
, &session
[i
]);
5023 int main(int argc
, char *argv
[])
5027 char *optconfig
= CONFIGFILE
;
5029 time(&basetime
); // start clock
5032 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
5037 if (fork()) exit(0);
5039 freopen("/dev/null", "r", stdin
);
5040 freopen("/dev/null", "w", stdout
);
5041 freopen("/dev/null", "w", stderr
);
5050 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
5053 printf("Args are:\n"
5054 "\t-d\t\tDetach from terminal\n"
5055 "\t-c <file>\tConfig file\n"
5056 "\t-h <hostname>\tForce hostname\n"
5064 // Start the timer routine off
5066 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
5069 initdata(optdebug
, optconfig
);
5073 /* set hostname /after/ having read the config file */
5074 if (*config
->hostname
)
5075 strcpy(hostname
, config
->hostname
);
5076 cli_init_complete(hostname
);
5078 init_tbf(config
->num_tbfs
);
5080 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
5081 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5082 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5085 rlim
.rlim_cur
= RLIM_INFINITY
;
5086 rlim
.rlim_max
= RLIM_INFINITY
;
5087 // Remove the maximum core size
5088 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
5089 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
5091 // Make core dumps go to /tmp
5095 if (config
->scheduler_fifo
)
5098 struct sched_param params
= {0};
5099 params
.sched_priority
= 1;
5101 if (get_nprocs() < 2)
5103 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5104 config
->scheduler_fifo
= 0;
5108 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
5110 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5114 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
5115 config
->scheduler_fifo
= 0;
5122 /* Set up the cluster communications port. */
5123 if (cluster_init() < 0)
5127 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevicename
);
5129 if (*config
->pppoe_if_to_bind
)
5132 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config
->pppoe_if_to_bind
);
5140 unsigned seed
= time_now
^ getpid();
5141 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
5145 signal(SIGHUP
, sighup_handler
);
5146 signal(SIGCHLD
, sigchild_handler
);
5147 signal(SIGTERM
, shutdown_handler
);
5148 signal(SIGINT
, shutdown_handler
);
5149 signal(SIGQUIT
, shutdown_handler
);
5151 // Prevent us from getting paged out
5152 if (config
->lock_pages
)
5154 if (!mlockall(MCL_CURRENT
))
5155 LOG(1, 0, 0, "Locking pages into memory\n");
5157 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
5162 /* remove plugins (so cleanup code gets run) */
5165 // Remove the PID file if we wrote it
5166 if (config
->wrote_pid
&& *config
->pid_file
== '/')
5167 unlink(config
->pid_file
);
5169 /* kill CLI children */
5170 signal(SIGTERM
, SIG_IGN
);
5175 static void sighup_handler(int sig
)
5180 static void shutdown_handler(int sig
)
5182 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
5185 static void sigchild_handler(int sig
)
5187 while (waitpid(-1, NULL
, WNOHANG
) > 0)
5191 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
5194 *challenge_response
= NULL
;
5196 if (!*config
->l2tp_secret
)
5198 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5202 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5204 *challenge_response
= calloc(17, 1);
5207 MD5_Update(&ctx
, &id
, 1);
5208 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5209 MD5_Update(&ctx
, challenge
, challenge_length
);
5210 MD5_Final(*challenge_response
, &ctx
);
5215 static int facility_value(char *name
)
5218 for (i
= 0; facilitynames
[i
].c_name
; i
++)
5220 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
5221 return facilitynames
[i
].c_val
;
5226 static void update_config()
5230 static int timeout
= 0;
5231 static int interval
= 0;
5238 if (log_stream
!= stderr
)
5244 if (*config
->log_filename
)
5246 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
5248 char *p
= config
->log_filename
+ 7;
5251 openlog("l2tpns", LOG_PID
, facility_value(p
));
5255 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
5257 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
5259 fseek(log_stream
, 0, SEEK_END
);
5260 setbuf(log_stream
, NULL
);
5264 log_stream
= stderr
;
5265 setbuf(log_stream
, NULL
);
5271 log_stream
= stderr
;
5272 setbuf(log_stream
, NULL
);
5275 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5276 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5278 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
5279 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
5280 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
5282 // reset MRU/MSS globals
5283 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
5284 if (MRU
> PPPoE_MRU
)
5287 MSS
= MRU
- TCP_HDRS
;
5290 config
->numradiusservers
= 0;
5291 for (i
= 0; i
< MAXRADSERVER
; i
++)
5292 if (config
->radiusserver
[i
])
5294 config
->numradiusservers
++;
5295 // Set radius port: if not set, take the port from the
5296 // first radius server. For the first radius server,
5297 // take the #defined default value from l2tpns.h
5299 // test twice, In case someone works with
5300 // a secondary radius server without defining
5301 // a primary one, this will work even then.
5302 if (i
> 0 && !config
->radiusport
[i
])
5303 config
->radiusport
[i
] = config
->radiusport
[i
-1];
5304 if (!config
->radiusport
[i
])
5305 config
->radiusport
[i
] = RADPORT
;
5308 if (!config
->numradiusservers
)
5309 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5311 // parse radius_authtypes_s
5312 config
->radius_authtypes
= config
->radius_authprefer
= 0;
5313 p
= config
->radius_authtypes_s
;
5316 char *s
= strpbrk(p
, " \t,");
5322 while (*s
== ' ' || *s
== '\t')
5329 if (!strncasecmp("chap", p
, strlen(p
)))
5331 else if (!strncasecmp("pap", p
, strlen(p
)))
5334 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
5336 config
->radius_authtypes
|= type
;
5337 if (!config
->radius_authprefer
)
5338 config
->radius_authprefer
= type
;
5343 if (!config
->radius_authtypes
)
5345 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5346 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
5349 // normalise radius_authtypes_s
5350 if (config
->radius_authprefer
== AUTHPAP
)
5352 strcpy(config
->radius_authtypes_s
, "pap");
5353 if (config
->radius_authtypes
& AUTHCHAP
)
5354 strcat(config
->radius_authtypes_s
, ", chap");
5358 strcpy(config
->radius_authtypes_s
, "chap");
5359 if (config
->radius_authtypes
& AUTHPAP
)
5360 strcat(config
->radius_authtypes_s
, ", pap");
5363 if (!config
->radius_dae_port
)
5364 config
->radius_dae_port
= DAEPORT
;
5367 if(!config
->bind_portremotelns
)
5368 config
->bind_portremotelns
= L2TPLACPORT
;
5369 if(!config
->bind_address_remotelns
)
5370 config
->bind_address_remotelns
= INADDR_ANY
;
5372 if(!config
->iftun_address
)
5373 config
->iftun_address
= config
->bind_address
;
5375 if (!*config
->pppoe_ac_name
)
5376 strncpy(config
->pppoe_ac_name
, DEFAULT_PPPOE_AC_NAME
, sizeof(config
->pppoe_ac_name
) - 1);
5378 // re-initialise the random number source
5379 initrandom(config
->random_device
);
5382 for (i
= 0; i
< MAXPLUGINS
; i
++)
5384 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
5387 if (*config
->plugins
[i
])
5390 add_plugin(config
->plugins
[i
]);
5392 else if (*config
->old_plugins
[i
])
5395 remove_plugin(config
->old_plugins
[i
]);
5400 guest_accounts_num
= 0;
5401 char *p2
= config
->guest_user
;
5404 char *s
= strpbrk(p2
, " \t,");
5408 while (*s
== ' ' || *s
== '\t')
5415 strcpy(guest_users
[guest_accounts_num
], p2
);
5416 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num
, guest_users
[guest_accounts_num
]);
5417 guest_accounts_num
++;
5420 // Rebuild the guest_user array
5421 strcpy(config
->guest_user
, "");
5423 for (ui
=0; ui
<guest_accounts_num
; ui
++)
5425 strcat(config
->guest_user
, guest_users
[ui
]);
5426 if (ui
<guest_accounts_num
-1)
5428 strcat(config
->guest_user
, ",");
5433 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
5434 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
5435 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
5436 if (!*config
->cluster_interface
)
5437 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
5439 if (!config
->cluster_hb_interval
)
5440 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
5442 if (!config
->cluster_hb_timeout
)
5443 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
5445 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
5447 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5448 // late, ensure we're sufficiently larger than that
5449 int t
= 4 * config
->cluster_hb_interval
+ 11;
5451 if (config
->cluster_hb_timeout
< t
)
5453 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
5454 config
->cluster_hb_timeout
= t
;
5457 // Push timing changes to the slaves immediately if we're the master
5458 if (config
->cluster_iam_master
)
5459 cluster_heartbeat();
5461 interval
= config
->cluster_hb_interval
;
5462 timeout
= config
->cluster_hb_timeout
;
5466 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
5469 if ((f
= fopen(config
->pid_file
, "w")))
5471 fprintf(f
, "%d\n", getpid());
5473 config
->wrote_pid
= 1;
5477 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
5482 static void read_config_file()
5486 if (!config
->config_file
) return;
5487 if (!(f
= fopen(config
->config_file
, "r")))
5489 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
5493 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
5495 LOG(3, 0, 0, "Done reading config file\n");
5499 int sessionsetup(sessionidt s
, tunnelidt t
)
5501 // A session now exists, set it up
5507 CSTAT(sessionsetup
);
5509 LOG(3, s
, t
, "Doing session setup for session\n");
5511 // Join a bundle if the MRRU option is accepted
5512 if(session
[s
].mrru
> 0 && session
[s
].bundle
== 0)
5514 LOG(3, s
, t
, "This session can be part of multilink bundle\n");
5515 if (join_bundle(s
) > 0)
5516 cluster_send_bundle(session
[s
].bundle
);
5519 LOG(0, s
, t
, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5520 sessionshutdown(s
, "Mismaching mssf option.", CDN_NONE
, TERM_SERVICE_UNAVAILABLE
);
5527 assign_ip_address(s
);
5530 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
5531 sessionshutdown(s
, "No IP addresses available.", CDN_TRY_ANOTHER
, TERM_SERVICE_UNAVAILABLE
);
5534 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
5535 fmtaddr(htonl(session
[s
].ip
), 0));
5538 // Make sure this is right
5539 session
[s
].tunnel
= t
;
5541 // zap old sessions with same IP and/or username
5542 // Don't kill gardened sessions - doing so leads to a DoS
5543 // from someone who doesn't need to know the password
5546 user
= session
[s
].user
;
5547 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5549 if (i
== s
) continue;
5550 if (!session
[s
].opened
) break;
5551 // Allow duplicate sessions for multilink ones of the same bundle.
5552 if (session
[s
].bundle
&& session
[i
].bundle
&& session
[s
].bundle
== session
[i
].bundle
) continue;
5554 if (ip
== session
[i
].ip
)
5556 sessionshutdown(i
, "Duplicate IP address", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5560 if (config
->allow_duplicate_users
) continue;
5561 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
5565 for (gu
= 0; gu
< guest_accounts_num
; gu
++)
5567 if (!strcasecmp(user
, guest_users
[gu
]))
5573 if (found
) continue;
5575 // Drop the new session in case of duplicate sessionss, not the old one.
5576 if (!strcasecmp(user
, session
[i
].user
))
5577 sessionshutdown(i
, "Duplicate session for users", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5581 // no need to set a route for the same IP address of the bundle
5582 if (!session
[s
].bundle
|| (bundle
[session
[s
].bundle
].num_of_links
== 1))
5586 // Add the route for this session.
5587 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
5589 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
5590 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
5593 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 1);
5596 // Static IPs need to be routed if not already
5597 // convered by a Framed-Route. Anything else is part
5598 // of the IP address pool and is already routed, it
5599 // just needs to be added to the IP cache.
5600 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5601 if (session
[s
].ip_pool_index
== -1) // static ip
5603 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
5606 cache_ipmap(session
[s
].ip
, s
);
5609 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
5610 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
5612 // Run the plugin's against this new session.
5614 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
5615 run_plugins(PLUGIN_NEW_SESSION
, &data
);
5618 // Allocate TBFs if throttled
5619 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
5620 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
5622 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
5624 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
5625 fmtaddr(htonl(session
[s
].ip
), 0),
5626 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
5628 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
5630 return 1; // RADIUS OK and IP allocated, done...
5634 // This session just got dropped on us by the master or something.
5635 // Make sure our tables up up to date...
5637 int load_session(sessionidt s
, sessiont
*new)
5643 if (new->ip_pool_index
>= MAXIPPOOL
||
5644 new->tunnel
>= MAXTUNNEL
)
5646 LOG(0, s
, 0, "Strange session update received!\n");
5647 // FIXME! What to do here?
5652 // Ok. All sanity checks passed. Now we're committed to
5653 // loading the new session.
5656 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
5658 // See if routes/ip cache need updating
5659 if (new->ip
!= session
[s
].ip
)
5662 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
5663 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
5664 new->route
[i
].prefixlen
!= session
[s
].route
[i
].prefixlen
)
5672 // remove old routes...
5673 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
5675 if ((session
[s
].ip
>> (32-session
[s
].route
[i
].prefixlen
)) ==
5676 (session
[s
].route
[i
].ip
>> (32-session
[s
].route
[i
].prefixlen
)))
5679 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].prefixlen
, 0, 0);
5685 if (session
[s
].ip_pool_index
== -1) // static IP
5687 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
5689 else // It's part of the IP pool, remove it manually.
5690 uncache_ipmap(session
[s
].ip
);
5695 // add new routes...
5696 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
5698 if ((new->ip
>> (32-new->route
[i
].prefixlen
)) ==
5699 (new->route
[i
].ip
>> (32-new->route
[i
].prefixlen
)))
5702 routeset(s
, new->route
[i
].ip
, new->route
[i
].prefixlen
, 0, 1);
5708 // If there's a new one, add it.
5709 if (new->ip_pool_index
== -1)
5711 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
5714 cache_ipmap(new->ip
, s
);
5719 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5720 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
5723 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
5725 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %u\n", (int) new->filter_in
);
5729 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
5731 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %u\n", (int) new->filter_out
);
5732 new->filter_out
= 0;
5735 if (new->filter_in
!= session
[s
].filter_in
)
5737 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
5738 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
5741 if (new->filter_out
!= session
[s
].filter_out
)
5743 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
5744 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
5747 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
5748 // for walking the sessions to forward byte counts to the master.
5749 config
->cluster_highest_sessionid
= s
;
5751 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
5753 // Do fixups into address pool.
5754 if (new->ip_pool_index
!= -1)
5755 fix_address_pool(s
);
5760 static void initplugins()
5764 loaded_plugins
= ll_init();
5765 // Initialize the plugins to nothing
5766 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
5767 plugins
[i
] = ll_init();
5770 static void *open_plugin(char *plugin_name
, int load
)
5772 char path
[256] = "";
5774 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
5775 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
5776 return dlopen(path
, RTLD_NOW
);
5779 // plugin callback to get a config value
5780 static void *getconfig(char *key
, enum config_typet type
)
5784 for (i
= 0; config_values
[i
].key
; i
++)
5786 if (!strcmp(config_values
[i
].key
, key
))
5788 if (config_values
[i
].type
== type
)
5789 return ((void *) config
) + config_values
[i
].offset
;
5791 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5792 key
, type
, config_values
[i
].type
);
5798 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
5802 static int add_plugin(char *plugin_name
)
5804 static struct pluginfuncs funcs
= {
5809 sessiontbysessionidt
,
5810 sessionidtbysessiont
,
5817 cluster_send_session
,
5820 void *p
= open_plugin(plugin_name
, 1);
5821 int (*initfunc
)(struct pluginfuncs
*);
5826 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5830 if (ll_contains(loaded_plugins
, p
))
5833 return 0; // already loaded
5837 int *v
= dlsym(p
, "plugin_api_version");
5838 if (!v
|| *v
!= PLUGIN_API_VERSION
)
5840 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5846 if ((initfunc
= dlsym(p
, "plugin_init")))
5848 if (!initfunc(&funcs
))
5850 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5856 ll_push(loaded_plugins
, p
);
5858 for (i
= 0; i
< max_plugin_functions
; i
++)
5861 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5863 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
5864 ll_push(plugins
[i
], x
);
5868 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
5872 static void run_plugin_done(void *plugin
)
5874 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
5880 static int remove_plugin(char *plugin_name
)
5882 void *p
= open_plugin(plugin_name
, 0);
5888 if (ll_contains(loaded_plugins
, p
))
5891 for (i
= 0; i
< max_plugin_functions
; i
++)
5894 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5895 ll_delete(plugins
[i
], x
);
5898 ll_delete(loaded_plugins
, p
);
5904 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
5908 int run_plugins(int plugin_type
, void *data
)
5910 int (*func
)(void *data
);
5912 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
5913 return PLUGIN_RET_ERROR
;
5915 ll_reset(plugins
[plugin_type
]);
5916 while ((func
= ll_next(plugins
[plugin_type
])))
5920 if (r
!= PLUGIN_RET_OK
)
5921 return r
; // stop here
5924 return PLUGIN_RET_OK
;
5927 static void plugins_done()
5931 ll_reset(loaded_plugins
);
5932 while ((p
= ll_next(loaded_plugins
)))
5936 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
5938 struct nsctl request
;
5939 struct nsctl response
;
5940 int type
= unpack_control(&request
, buf
, len
);
5944 if (log_stream
&& config
->debug
>= 4)
5948 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5949 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
5953 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5954 dump_control(&request
, log_stream
);
5960 case NSCTL_REQ_LOAD
:
5961 if (request
.argc
!= 1)
5963 response
.type
= NSCTL_RES_ERR
;
5965 response
.argv
[0] = "name of plugin required";
5967 else if ((r
= add_plugin(request
.argv
[0])) < 1)
5969 response
.type
= NSCTL_RES_ERR
;
5971 response
.argv
[0] = !r
5972 ? "plugin already loaded"
5973 : "error loading plugin";
5977 response
.type
= NSCTL_RES_OK
;
5983 case NSCTL_REQ_UNLOAD
:
5984 if (request
.argc
!= 1)
5986 response
.type
= NSCTL_RES_ERR
;
5988 response
.argv
[0] = "name of plugin required";
5990 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
5992 response
.type
= NSCTL_RES_ERR
;
5994 response
.argv
[0] = !r
5995 ? "plugin not loaded"
5996 : "plugin not found";
6000 response
.type
= NSCTL_RES_OK
;
6006 case NSCTL_REQ_HELP
:
6007 response
.type
= NSCTL_RES_OK
;
6010 ll_reset(loaded_plugins
);
6011 while ((p
= ll_next(loaded_plugins
)))
6013 char **help
= dlsym(p
, "plugin_control_help");
6014 while (response
.argc
< 0xff && help
&& *help
)
6015 response
.argv
[response
.argc
++] = *help
++;
6020 case NSCTL_REQ_CONTROL
:
6022 struct param_control param
= {
6023 config
->cluster_iam_master
,
6030 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
6032 if (r
== PLUGIN_RET_ERROR
)
6034 response
.type
= NSCTL_RES_ERR
;
6036 response
.argv
[0] = param
.additional
6038 : "error returned by plugin";
6040 else if (r
== PLUGIN_RET_NOTMASTER
)
6042 static char msg
[] = "must be run on master: 000.000.000.000";
6044 response
.type
= NSCTL_RES_ERR
;
6046 if (config
->cluster_master_address
)
6048 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
6049 response
.argv
[0] = msg
;
6053 response
.argv
[0] = "must be run on master: none elected";
6056 else if (!(param
.response
& NSCTL_RESPONSE
))
6058 response
.type
= NSCTL_RES_ERR
;
6060 response
.argv
[0] = param
.response
6061 ? "unrecognised response value from plugin"
6062 : "unhandled action";
6066 response
.type
= param
.response
;
6068 if (param
.additional
)
6071 response
.argv
[0] = param
.additional
;
6079 response
.type
= NSCTL_RES_ERR
;
6081 response
.argv
[0] = "error unpacking control packet";
6084 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
6087 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6091 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
6094 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
6095 if (log_stream
&& config
->debug
>= 4)
6097 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
6098 dump_control(&response
, log_stream
);
6102 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6103 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
6108 static tunnelidt
new_tunnel()
6111 for (i
= 1; i
< MAXTUNNEL
; i
++)
6113 if ((tunnel
[i
].state
== TUNNELFREE
) && (i
!= TUNNEL_ID_PPPOE
))
6115 LOG(4, 0, i
, "Assigning tunnel ID %u\n", i
);
6116 if (i
> config
->cluster_highest_tunnelid
)
6117 config
->cluster_highest_tunnelid
= i
;
6121 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6126 // We're becoming the master. Do any required setup..
6128 // This is principally telling all the plugins that we're
6129 // now a master, and telling them about all the sessions
6130 // that are active too..
6132 void become_master(void)
6135 static struct event_data d
[RADIUS_FDS
];
6136 struct epoll_event e
;
6138 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
6140 // running a bunch of iptables commands is slow and can cause
6141 // the master to drop tunnels on takeover--kludge around the
6142 // problem by forking for the moment (note: race)
6143 if (!fork_and_close())
6145 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6147 if (!session
[s
].opened
) // Not an in-use session.
6150 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
6157 for (i
= 0; i
< RADIUS_FDS
; i
++)
6159 d
[i
].type
= FD_TYPE_RADIUS
;
6163 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
6167 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
6173 if (CLI_HELP_REQUESTED
)
6174 return CLI_HELP_NO_ARGS
;
6177 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6179 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6182 if (!session
[s
].opened
)
6185 idle
= time_now
- session
[s
].last_data
;
6186 idle
/= 5 ; // In multiples of 5 seconds.
6196 for (i
= 0; i
< 63; ++i
)
6198 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6200 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
6201 cli_print(cli
, "%d total sessions open.", count
);
6205 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
6211 if (CLI_HELP_REQUESTED
)
6212 return CLI_HELP_NO_ARGS
;
6215 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6217 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6220 if (!session
[s
].opened
)
6223 d
= time_now
- session
[s
].opened
;
6226 while (d
> 1 && open
< 32)
6236 for (i
= 0; i
< 30; ++i
)
6238 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6241 cli_print(cli
, "%d total sessions open.", count
);
6247 * This unencodes the AVP using the L2TP secret and the previously
6248 * stored random vector. It overwrites the hidden data with the
6249 * unhidden AVP subformat.
6251 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
6257 uint16_t m
= htons(type
);
6259 // Compute initial pad
6261 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
6262 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6263 MD5_Update(&ctx
, vector
, vec_len
);
6264 MD5_Final(digest
, &ctx
);
6266 // pointer to last decoded 16 octets
6271 // calculate a new pad based on the last decoded block
6272 if (d
>= sizeof(digest
))
6275 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6276 MD5_Update(&ctx
, last
, sizeof(digest
));
6277 MD5_Final(digest
, &ctx
);
6283 *value
++ ^= digest
[d
++];
6288 int find_filter(char const *name
, size_t len
)
6293 for (i
= 0; i
< MAXFILTER
; i
++)
6295 if (!*ip_filters
[i
].name
)
6303 if (strlen(ip_filters
[i
].name
) != len
)
6306 if (!strncmp(ip_filters
[i
].name
, name
, len
))
6313 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
6317 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
6318 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
6319 case FILTER_PORT_OP_GT
: return port
> p
->port
;
6320 case FILTER_PORT_OP_LT
: return port
< p
->port
;
6321 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
6327 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
6331 case FILTER_FLAG_OP_ANY
:
6332 return (flags
& sflags
) || (~flags
& cflags
);
6334 case FILTER_FLAG_OP_ALL
:
6335 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
6337 case FILTER_FLAG_OP_EST
:
6338 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
6344 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
6346 uint16_t frag_offset
;
6350 uint16_t src_port
= 0;
6351 uint16_t dst_port
= 0;
6353 ip_filter_rulet
*rule
;
6355 if (len
< 20) // up to end of destination address
6358 if ((*buf
>> 4) != 4) // IPv4
6361 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
6363 src_ip
= *(in_addr_t
*) (buf
+ 12);
6364 dst_ip
= *(in_addr_t
*) (buf
+ 16);
6366 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
6368 int l
= (buf
[0] & 0xf) * 4; // length of IP header
6369 if (len
< l
+ 4) // ports
6372 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
6373 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
6374 if (proto
== IPPROTO_TCP
)
6376 if (len
< l
+ 14) // flags
6379 flags
= buf
[l
+ 13] & 0x3f;
6383 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
6385 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
6388 if (rule
->src_wild
!= INADDR_BROADCAST
&&
6389 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
6392 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
6393 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
6398 // layer 4 deny rules are skipped
6399 if (rule
->action
== FILTER_ACTION_DENY
&&
6400 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
6408 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
6410 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
6413 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
6416 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
6417 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
6424 return rule
->action
== FILTER_ACTION_PERMIT
;
6433 tunnelidt
lac_new_tunnel()
6435 return new_tunnel();
6438 void lac_tunnelclear(tunnelidt t
)
6443 void lac_send_SCCRQ(tunnelidt t
, uint8_t * auth
, unsigned int auth_len
)
6445 uint16_t version
= 0x0100; // protocol version
6447 tunnel
[t
].state
= TUNNELOPENING
;
6449 // Sent SCCRQ - Start Control Connection Request
6450 controlt
*c
= controlnew(1); // sending SCCRQ
6451 controls(c
, 7, hostname
, 1); // host name
6452 controls(c
, 8, Vendor_name
, 1); // Vendor name
6453 control16(c
, 2, version
, 1); // protocol version
6454 control32(c
, 3, 3, 1); // framing Capabilities
6455 control16(c
, 9, t
, 1); // assigned tunnel
6456 controlb(c
, 11, (uint8_t *) auth
, auth_len
, 1); // CHAP Challenge
6457 LOG(3, 0, t
, "Sent SCCRQ to REMOTE LNS\n");
6458 controladd(c
, 0, t
); // send
6461 void lac_send_ICRQ(tunnelidt t
, sessionidt s
)
6463 // Sent ICRQ Incoming-call-request
6464 controlt
*c
= controlnew(10); // ICRQ
6466 control16(c
, 14, s
, 1); // assigned sesion
6467 call_serial_number
++;
6468 control32(c
, 15, call_serial_number
, 1); // call serial number
6469 LOG(3, s
, t
, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel
[t
].far
);
6470 controladd(c
, 0, t
); // send
6473 void lac_tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
6475 tunnelshutdown(t
, reason
, result
, error
, msg
);