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
),
196 static char *plugin_functions
[] = {
201 "plugin_new_session",
202 "plugin_kill_session",
204 "plugin_radius_response",
205 "plugin_radius_reset",
206 "plugin_radius_account",
207 "plugin_become_master",
208 "plugin_new_session_master",
211 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
213 // Counters for shutdown sessions
214 static sessiont shut_acct
[8192];
215 static sessionidt shut_acct_n
= 0;
217 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
218 bundlet
*bundle
= NULL
; // Array of bundle structures.
219 fragmentationt
*frag
= NULL
; // Array of fragmentation structures.
220 sessiont
*session
= NULL
; // Array of session structures.
221 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
222 radiust
*radius
= NULL
; // Array of radius structures.
223 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
224 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
225 static controlt
*controlfree
= 0;
226 struct Tstats
*_statistics
= NULL
;
228 struct Tringbuffer
*ringbuffer
= NULL
;
231 static ssize_t
netlink_send(struct nlmsghdr
*nh
);
232 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
);
233 static void cache_ipmap(in_addr_t ip
, sessionidt s
);
234 static void uncache_ipmap(in_addr_t ip
);
235 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
);
236 static void free_ip_address(sessionidt s
);
237 static void dump_acct_info(int all
);
238 static void sighup_handler(int sig
);
239 static void shutdown_handler(int sig
);
240 static void sigchild_handler(int sig
);
241 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
242 static void update_config(void);
243 static void read_config_file(void);
244 static void initplugins(void);
245 static int add_plugin(char *plugin_name
);
246 static int remove_plugin(char *plugin_name
);
247 static void plugins_done(void);
248 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
);
249 static tunnelidt
new_tunnel(void);
250 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
251 static void bundleclear(bundleidt b
);
253 // return internal time (10ths since process startup), set f if given
254 // as a side-effect sets time_now, and time_changed
255 static clockt
now(double *f
)
259 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
260 if (t
.tv_sec
!= time_now
)
266 // Time in milliseconds
267 // TODO FOR MLPPP DEV
268 //time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
270 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
273 // work out a retry time based on try number
274 // This is a straight bounded exponential backoff.
275 // Maximum re-try time is 32 seconds. (2^5).
276 clockt
backoff(uint8_t try)
278 if (try > 5) try = 5; // max backoff
279 return now(NULL
) + 10 * (1 << try);
284 // Log a debug message. Typically called via the LOG macro
286 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
288 static char message
[65536] = {0};
294 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
295 ringbuffer
->tail
= 0;
296 if (ringbuffer
->tail
== ringbuffer
->head
)
297 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
298 ringbuffer
->head
= 0;
300 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
301 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
302 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
303 va_start(ap
, format
);
304 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, MAX_LOG_LENGTH
, format
, ap
);
309 if (config
->debug
< level
) return;
311 va_start(ap
, format
);
312 vsnprintf(message
, sizeof(message
), format
, ap
);
315 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
317 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
322 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
325 const uint8_t *d
= data
;
327 if (config
->debug
< level
) return;
329 // No support for _log_hex to syslog
332 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
333 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
335 for (i
= 0; i
< maxsize
; )
337 fprintf(log_stream
, "%4X: ", i
);
338 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
340 fprintf(log_stream
, "%02X ", d
[j
]);
342 fputs(": ", log_stream
);
345 for (; j
< i
+ 16; j
++)
347 fputs(" ", log_stream
);
349 fputs(": ", log_stream
);
352 fputs(" ", log_stream
);
353 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
355 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
356 fputc(d
[j
], log_stream
);
358 fputc('.', log_stream
);
361 fputs(" ", log_stream
);
365 fputs("\n", log_stream
);
369 setbuf(log_stream
, NULL
);
373 // update a counter, accumulating 2^32 wraps
374 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
376 uint32_t new = *counter
+ delta
;
383 // initialise the random generator
384 static void initrandom(char *source
)
386 static char path
[sizeof(config
->random_device
)] = "*undefined*";
388 // reinitialise only if we are forced to do so or if the config has changed
389 if (source
&& !strncmp(path
, source
, sizeof(path
)))
392 // close previous source, if any
401 snprintf(path
, sizeof(path
), "%s", source
);
405 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
407 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
408 path
, strerror(errno
));
413 // fill buffer with random data
414 void random_data(uint8_t *buf
, int len
)
421 n
= read(rand_fd
, buf
, len
);
422 if (n
>= len
) return;
427 LOG(0, 0, 0, "Error reading from random source: %s\n",
430 // fall back to rand()
438 // append missing data
440 // not using the low order bits from the prng stream
441 buf
[n
++] = (rand() >> 4) & 0xff;
446 // This adds it to the routing table, advertises it
447 // via BGP if enabled, and stuffs it into the
448 // 'sessionbyip' cache.
450 // 'ip' must be in _host_ order.
452 static void routeset(sessionidt s
, in_addr_t ip
, int prefixlen
, in_addr_t gw
, int add
)
462 if (!prefixlen
) prefixlen
= 32;
464 ip
&= 0xffffffff << (32 - prefixlen
);; // Force the ip to be the first one in the route.
466 memset(&req
, 0, sizeof(req
));
470 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
471 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
475 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
476 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
479 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
481 req
.rt
.rtm_family
= AF_INET
;
482 req
.rt
.rtm_dst_len
= prefixlen
;
483 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
484 req
.rt
.rtm_protocol
= 42;
485 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
486 req
.rt
.rtm_type
= RTN_UNICAST
;
488 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
490 netlink_addattr(&req
.nh
, RTA_DST
, &n_ip
, sizeof(n_ip
));
494 netlink_addattr(&req
.nh
, RTA_GATEWAY
, &n_ip
, sizeof(n_ip
));
497 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d%s%s\n", add
? "add" : "del",
498 fmtaddr(htonl(ip
), 0), prefixlen
,
499 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
501 if (netlink_send(&req
.nh
) < 0)
502 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno
));
506 bgp_add_route(htonl(ip
), prefixlen
);
508 bgp_del_route(htonl(ip
), prefixlen
);
511 // Add/Remove the IPs to the 'sessionbyip' cache.
512 // Note that we add the zero address in the case of
513 // a network route. Roll on CIDR.
515 // Note that 's == 0' implies this is the address pool.
516 // We still cache it here, because it will pre-fill
517 // the malloc'ed tree.
521 if (!add
) // Are we deleting a route?
522 s
= 0; // Caching the session as '0' is the same as uncaching.
524 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
529 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
537 char ipv6addr
[INET6_ADDRSTRLEN
];
539 if (!config
->ipv6_prefix
.s6_addr
[0])
541 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
545 memset(&req
, 0, sizeof(req
));
549 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
550 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
554 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
555 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
558 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
560 req
.rt
.rtm_family
= AF_INET6
;
561 req
.rt
.rtm_dst_len
= prefixlen
;
562 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
563 req
.rt
.rtm_protocol
= 42;
564 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
565 req
.rt
.rtm_type
= RTN_UNICAST
;
567 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
568 netlink_addattr(&req
.nh
, RTA_DST
, &ip
, sizeof(ip
));
570 netlink_addattr(&req
.nh
, RTA_METRICS
, &metric
, sizeof(metric
));
572 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d\n",
574 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
577 if (netlink_send(&req
.nh
) < 0)
578 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno
));
582 bgp_add_route6(ip
, prefixlen
);
584 bgp_del_route6(ip
, prefixlen
);
589 if (!add
) // Are we deleting a route?
590 s
= 0; // Caching the session as '0' is the same as uncaching.
592 cache_ipv6map(ip
, prefixlen
, s
);
599 // Set up netlink socket
600 static void initnetlink(void)
602 struct sockaddr_nl nladdr
;
604 nlfd
= socket(AF_NETLINK
, SOCK_RAW
, NETLINK_ROUTE
);
607 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno
));
611 memset(&nladdr
, 0, sizeof(nladdr
));
612 nladdr
.nl_family
= AF_NETLINK
;
613 nladdr
.nl_pid
= getpid();
615 if (bind(nlfd
, (struct sockaddr
*)&nladdr
, sizeof(nladdr
)) < 0)
617 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno
));
622 static ssize_t
netlink_send(struct nlmsghdr
*nh
)
624 struct sockaddr_nl nladdr
;
628 nh
->nlmsg_pid
= getpid();
629 nh
->nlmsg_seq
= ++nlseqnum
;
631 // set kernel address
632 memset(&nladdr
, 0, sizeof(nladdr
));
633 nladdr
.nl_family
= AF_NETLINK
;
635 iov
= (struct iovec
){ (void *)nh
, nh
->nlmsg_len
};
636 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
638 return sendmsg(nlfd
, &msg
, 0);
641 static ssize_t
netlink_recv(void *buf
, ssize_t len
)
643 struct sockaddr_nl nladdr
;
647 // set kernel address
648 memset(&nladdr
, 0, sizeof(nladdr
));
649 nladdr
.nl_family
= AF_NETLINK
;
651 iov
= (struct iovec
){ buf
, len
};
652 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
654 return recvmsg(nlfd
, &msg
, 0);
657 /* adapted from iproute2 */
658 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
)
660 int len
= RTA_LENGTH(alen
);
663 rta
= (struct rtattr
*)(((void *)nh
) + NLMSG_ALIGN(nh
->nlmsg_len
));
664 rta
->rta_type
= type
;
666 memcpy(RTA_DATA(rta
), data
, alen
);
667 nh
->nlmsg_len
= NLMSG_ALIGN(nh
->nlmsg_len
) + RTA_ALIGN(len
);
670 // messages corresponding to different phases seq number
671 static char *tun_nl_phase_msg
[] = {
673 "getting tun interface index",
674 "setting tun interface parameters",
675 "setting tun IPv4 address",
676 "setting tun LL IPv6 address",
677 "setting tun global IPv6 address",
681 // Set up TUN interface
682 static void inittun(void)
686 memset(&ifr
, 0, sizeof(ifr
));
687 ifr
.ifr_flags
= IFF_TUN
;
689 tunfd
= open(TUNDEVICE
, O_RDWR
);
692 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
696 int flags
= fcntl(tunfd
, F_GETFL
, 0);
697 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
700 if (*config
->tundevicename
)
701 strncpy(ifr
.ifr_name
, config
->tundevicename
, IFNAMSIZ
);
703 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
705 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
708 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevicename
) - 1);
709 strncpy(config
->tundevicename
, ifr
.ifr_name
, sizeof(config
->tundevicename
));
711 tunidx
= if_nametoindex(config
->tundevicename
);
714 LOG(0, 0, 0, "Can't get tun interface index\n");
723 struct ifinfomsg ifinfo
;
724 struct ifaddrmsg ifaddr
;
726 char rtdata
[32]; // 32 should be enough
728 uint32_t txqlen
, mtu
;
731 memset(&req
, 0, sizeof(req
));
733 req
.nh
.nlmsg_type
= RTM_NEWLINK
;
734 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_MULTI
;
735 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifinfo
));
737 req
.ifmsg
.ifinfo
.ifi_family
= AF_UNSPEC
;
738 req
.ifmsg
.ifinfo
.ifi_index
= tunidx
;
739 req
.ifmsg
.ifinfo
.ifi_flags
|= IFF_UP
; // set interface up
740 req
.ifmsg
.ifinfo
.ifi_change
= IFF_UP
; // only change this flag
742 /* Bump up the qlen to deal with bursts from the network */
744 netlink_addattr(&req
.nh
, IFLA_TXQLEN
, &txqlen
, sizeof(txqlen
));
745 /* set MTU to modem MRU */
747 netlink_addattr(&req
.nh
, IFLA_MTU
, &mtu
, sizeof(mtu
));
749 if (netlink_send(&req
.nh
) < 0)
752 memset(&req
, 0, sizeof(req
));
754 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
755 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
756 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
758 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET
;
759 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 32;
760 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
761 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
763 if (config
->iftun_address
)
764 ip
= config
->iftun_address
;
766 ip
= 0x01010101; // 1.1.1.1
767 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
769 if (netlink_send(&req
.nh
) < 0)
772 // Only setup IPv6 on the tun device if we have a configured prefix
773 if (config
->ipv6_prefix
.s6_addr
[0]) {
776 memset(&req
, 0, sizeof(req
));
778 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
779 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
780 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
782 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
783 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
784 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_LINK
;
785 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
787 // Link local address is FE80::1
788 memset(&ip6
, 0, sizeof(ip6
));
789 ip6
.s6_addr
[0] = 0xFE;
790 ip6
.s6_addr
[1] = 0x80;
792 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
794 if (netlink_send(&req
.nh
) < 0)
797 memset(&req
, 0, sizeof(req
));
799 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
800 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
801 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
803 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
804 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
805 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
806 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
808 // Global address is prefix::1
809 ip6
= config
->ipv6_prefix
;
811 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
813 if (netlink_send(&req
.nh
) < 0)
817 memset(&req
, 0, sizeof(req
));
819 req
.nh
.nlmsg_type
= NLMSG_DONE
;
820 req
.nh
.nlmsg_len
= NLMSG_LENGTH(0);
822 if (netlink_send(&req
.nh
) < 0)
825 // if we get an error for seqnum < min_initok_nlseqnum,
826 // we must exit as initialization went wrong
827 if (config
->ipv6_prefix
.s6_addr
[0])
828 min_initok_nlseqnum
= 5 + 1; // idx + if + addr + 2*addr6
830 min_initok_nlseqnum
= 3 + 1; // idx + if + addr
836 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno
));
841 static void initudp(void)
844 struct sockaddr_in addr
;
847 memset(&addr
, 0, sizeof(addr
));
848 addr
.sin_family
= AF_INET
;
849 addr
.sin_port
= htons(L2TPPORT
);
850 addr
.sin_addr
.s_addr
= config
->bind_address
;
851 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
852 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
854 int flags
= fcntl(udpfd
, F_GETFL
, 0);
855 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
857 if (bind(udpfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
859 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
864 memset(&addr
, 0, sizeof(addr
));
865 addr
.sin_family
= AF_INET
;
866 addr
.sin_port
= htons(NSCTL_PORT
);
867 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
868 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
869 setsockopt(controlfd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
870 if (bind(controlfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
872 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
876 // Dynamic Authorization Extensions to RADIUS
877 memset(&addr
, 0, sizeof(addr
));
878 addr
.sin_family
= AF_INET
;
879 addr
.sin_port
= htons(config
->radius_dae_port
);
880 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
881 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
882 setsockopt(daefd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
883 if (bind(daefd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
885 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
890 // Tunnel to Remote LNS
891 memset(&addr
, 0, sizeof(addr
));
892 addr
.sin_family
= AF_INET
;
893 addr
.sin_port
= htons(config
->bind_portremotelns
);
894 addr
.sin_addr
.s_addr
= config
->bind_address_remotelns
;
895 udplacfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
896 setsockopt(udplacfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
898 int flags
= fcntl(udplacfd
, F_GETFL
, 0);
899 fcntl(udplacfd
, F_SETFL
, flags
| O_NONBLOCK
);
901 if (bind(udplacfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
903 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno
));
909 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
913 // Find session by IP, < 1 for not found
915 // Confusingly enough, this 'ip' must be
916 // in _network_ order. This being the common
917 // case when looking it up from IP packet headers.
919 // We actually use this cache for two things.
920 // #1. For used IP addresses, this maps to the
921 // session ID that it's used by.
922 // #2. For un-used IP addresses, this maps to the
923 // index into the pool table that contains that
927 static sessionidt
lookup_ipmap(in_addr_t ip
)
929 uint8_t *a
= (uint8_t *) &ip
;
930 union iphash
*h
= ip_hash
;
932 if (!(h
= h
[*a
++].idx
)) return 0;
933 if (!(h
= h
[*a
++].idx
)) return 0;
934 if (!(h
= h
[*a
++].idx
)) return 0;
939 static sessionidt
lookup_ipv6map(struct in6_addr ip
)
941 struct ipv6radix
*curnode
;
944 char ipv6addr
[INET6_ADDRSTRLEN
];
946 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
950 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
952 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
957 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
958 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
965 sessionidt
sessionbyip(in_addr_t ip
)
967 sessionidt s
= lookup_ipmap(ip
);
970 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
976 sessionidt
sessionbyipv6(struct in6_addr ip
)
979 CSTAT(sessionbyipv6
);
981 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
982 (ip
.s6_addr
[0] == 0xFE &&
983 ip
.s6_addr
[1] == 0x80 &&
984 ip
.s6_addr16
[1] == 0 &&
985 ip
.s6_addr16
[2] == 0 &&
986 ip
.s6_addr16
[3] == 0)) {
987 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
989 s
= lookup_ipv6map(ip
);
992 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
999 // Take an IP address in HOST byte order and
1000 // add it to the sessionid by IP cache.
1002 // (It's actually cached in network order)
1004 static void cache_ipmap(in_addr_t ip
, sessionidt s
)
1006 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
1007 uint8_t *a
= (uint8_t *) &nip
;
1008 union iphash
*h
= ip_hash
;
1011 for (i
= 0; i
< 3; i
++)
1013 if (!(h
[a
[i
]].idx
|| (h
[a
[i
]].idx
= calloc(256, sizeof(union iphash
)))))
1022 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
1025 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
1026 // else a map to an ip pool index.
1029 static void uncache_ipmap(in_addr_t ip
)
1031 cache_ipmap(ip
, 0); // Assign it to the NULL session.
1034 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
)
1038 struct ipv6radix
*curnode
;
1039 char ipv6addr
[INET6_ADDRSTRLEN
];
1041 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
1043 bytes
= prefixlen
>> 3;
1046 if (curnode
->branch
== NULL
)
1048 if (!(curnode
->branch
= calloc(256,
1049 sizeof (struct ipv6radix
))))
1052 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
1059 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
1060 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1064 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1065 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1071 // CLI list to dump current ipcache.
1073 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
1075 union iphash
*d
= ip_hash
, *e
, *f
, *g
;
1079 if (CLI_HELP_REQUESTED
)
1080 return CLI_HELP_NO_ARGS
;
1082 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
1084 for (i
= 0; i
< 256; ++i
)
1090 for (j
= 0; j
< 256; ++j
)
1096 for (k
= 0; k
< 256; ++k
)
1102 for (l
= 0; l
< 256; ++l
)
1107 cli_print(cli
, "%7d %d.%d.%d.%d", g
[l
].sess
, i
, j
, k
, l
);
1113 cli_print(cli
, "%d entries in cache", count
);
1118 // Find session by username, 0 for not found
1119 // walled garden users aren't authenticated, so the username is
1120 // reasonably useless. Ignore them to avoid incorrect actions
1122 // This is VERY inefficent. Don't call it often. :)
1124 sessionidt
sessionbyuser(char *username
)
1127 CSTAT(sessionbyuser
);
1129 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1131 if (!session
[s
].opened
)
1134 if (session
[s
].walled_garden
)
1135 continue; // Skip walled garden users.
1137 if (!strncmp(session
[s
].user
, username
, 128))
1141 return 0; // Not found.
1144 void send_garp(in_addr_t ip
)
1150 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
1153 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
1156 memset(&ifr
, 0, sizeof(ifr
));
1157 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
1158 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
1160 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
1164 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
1165 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
1167 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
1172 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
1175 static sessiont
*sessiontbysessionidt(sessionidt s
)
1177 if (!s
|| s
>= MAXSESSION
) return NULL
;
1181 static sessionidt
sessionidtbysessiont(sessiont
*s
)
1183 sessionidt val
= s
-session
;
1184 if (s
< session
|| val
>= MAXSESSION
) return 0;
1188 // actually send a control message for a specific tunnel
1189 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
1191 struct sockaddr_in addr
;
1197 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
1198 STAT(tunnel_tx_errors
);
1202 if (t
== TUNNEL_ID_PPPOE
)
1204 pppoe_sess_send(buf
, l
, t
);
1210 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1211 STAT(tunnel_tx_errors
);
1215 memset(&addr
, 0, sizeof(addr
));
1216 addr
.sin_family
= AF_INET
;
1217 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
1218 addr
.sin_port
= htons(tunnel
[t
].port
);
1220 // sequence expected, if sequence in message
1221 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
1223 // If this is a control message, deal with retries
1226 tunnel
[t
].last
= time_now
; // control message sent
1227 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
1230 STAT(tunnel_retries
);
1231 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
1235 if (sendto((tunnel
[t
].isremotelns
?udplacfd
:udpfd
), buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1237 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1240 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1241 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
1242 STAT(tunnel_tx_errors
);
1246 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
1247 STAT(tunnel_tx_packets
);
1248 INC_STAT(tunnel_tx_bytes
, l
);
1252 // Tiny helper function to write data to
1253 // the 'tun' device.
1255 int tun_write(uint8_t * data
, int size
)
1257 return write(tunfd
, data
, size
);
1260 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1261 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1263 int d
= (tcp
[12] >> 4) * 4;
1270 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1273 if (tcp
+ d
> buf
+ len
) // short?
1281 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1284 if (mss
+ 2 > data
) return; // short?
1288 if (*opts
== 0) return; // end of options
1289 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1292 opts
+= opts
[1]; // skip over option
1295 if (!mss
) return; // not found
1296 orig
= ntohs(*(uint16_t *) mss
);
1298 if (orig
<= MSS
) return; // mss OK
1300 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1301 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1302 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1303 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1306 *(int16_t *) mss
= htons(MSS
);
1308 // adjust checksum (see rfc1141)
1309 sum
= orig
+ (~MSS
& 0xffff);
1310 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1311 sum
= (sum
& 0xffff) + (sum
>> 16);
1312 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1315 void processmpframe(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint8_t extra
)
1319 // Skip the four extra bytes
1331 proto
= ntohs(*(uint16_t *) p
);
1339 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1340 return; // closing session, PPP not processed
1342 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1343 processipin(s
, t
, p
, l
);
1345 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
1349 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1350 return; // closing session, PPP not processed
1353 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1354 processipv6in(s
, t
, p
, l
);
1356 else if (proto
== PPPIPCP
)
1358 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1359 processipcp(s
, t
, p
, l
);
1361 else if (proto
== PPPCCP
)
1363 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1364 processccp(s
, t
, p
, l
);
1368 LOG(2, s
, t
, "MPPP: Unsupported MP protocol 0x%04X received\n",proto
);
1372 static void update_session_out_stat(sessionidt s
, sessiont
*sp
, int len
)
1374 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1375 sp
->cout_delta
+= len
;
1377 sp
->last_data
= time_now
;
1379 sess_local
[s
].cout
+= len
; // To send to master..
1380 sess_local
[s
].pout
++;
1383 // process outgoing (to tunnel) IP
1385 // (i.e. this routine writes to data[-8]).
1386 void processipout(uint8_t *buf
, int len
)
1393 uint8_t *data
= buf
; // Keep a copy of the originals.
1396 uint8_t fragbuf
[MAXETHER
+ 20];
1398 CSTAT(processipout
);
1400 if (len
< MIN_IP_SIZE
)
1402 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1403 STAT(tun_rx_errors
);
1406 if (len
>= MAXETHER
)
1408 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1409 STAT(tun_rx_errors
);
1413 // Skip the tun header
1417 // Got an IP header now
1418 if (*(uint8_t *)(buf
) >> 4 != 4)
1420 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1424 ip
= *(uint32_t *)(buf
+ 16);
1425 if (!(s
= sessionbyip(ip
)))
1427 // Is this a packet for a session that doesn't exist?
1428 static int rate
= 0; // Number of ICMP packets we've sent this second.
1429 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1431 if (last
!= time_now
)
1437 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1439 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1440 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1441 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1446 t
= session
[s
].tunnel
;
1447 if (len
> session
[s
].mru
|| (session
[s
].mrru
&& len
> session
[s
].mrru
))
1449 LOG(3, s
, t
, "Packet size more than session MRU\n");
1455 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1456 if (config
->max_packets
> 0)
1458 if (sess_local
[s
].last_packet_out
== TIME
)
1460 int max
= config
->max_packets
;
1462 // All packets for throttled sessions are handled by the
1463 // master, so further limit by using the throttle rate.
1464 // A bit of a kludge, since throttle rate is in kbps,
1465 // but should still be generous given our average DSL
1466 // packet size is 200 bytes: a limit of 28kbps equates
1467 // to around 180 packets per second.
1468 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1469 max
= sp
->throttle_out
;
1471 if (++sess_local
[s
].packets_out
> max
)
1473 sess_local
[s
].packets_dropped
++;
1479 if (sess_local
[s
].packets_dropped
)
1481 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1482 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1483 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1484 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1488 sess_local
[s
].last_packet_out
= TIME
;
1489 sess_local
[s
].packets_out
= 1;
1490 sess_local
[s
].packets_dropped
= 0;
1494 // run access-list if any
1495 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1498 // adjust MSS on SYN and SYN,ACK packets with options
1499 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1501 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1502 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1503 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1508 // Are we throttling this session?
1509 if (config
->cluster_iam_master
)
1510 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1512 master_throttle_packet(sp
->tbf_out
, data
, size
);
1516 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1518 // We are walled-gardening this
1519 master_garden_packet(s
, data
, size
);
1523 if(session
[s
].bundle
!= 0 && bundle
[session
[s
].bundle
].num_of_links
> 1)
1526 if (!config
->cluster_iam_master
)
1528 // The MPPP packets must be managed by the Master.
1529 master_forward_mppp_packet(s
, data
, size
);
1533 // Add on L2TP header
1534 sessionidt members
[MAXBUNDLESES
];
1535 bundleidt bid
= session
[s
].bundle
;
1536 bundlet
*b
= &bundle
[bid
];
1537 uint32_t num_of_links
, nb_opened
;
1540 num_of_links
= b
->num_of_links
;
1542 for (i
= 0;i
< num_of_links
;i
++)
1545 if (session
[s
].ppp
.lcp
== Opened
)
1547 members
[nb_opened
] = s
;
1554 LOG(3, s
, t
, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid
);
1558 num_of_links
= nb_opened
;
1559 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1560 s
= members
[b
->current_ses
];
1561 t
= session
[s
].tunnel
;
1563 LOG(4, s
, t
, "MPPP: (1)Session number becomes: %d\n", s
);
1565 if (num_of_links
> 1)
1567 if(len
> MINFRAGLEN
)
1569 //for rotate traffic among the member links
1570 uint32_t divisor
= num_of_links
;
1572 divisor
= divisor
/2 + (divisor
& 1);
1574 // Partition the packet to "num_of_links" fragments
1575 uint32_t fraglen
= len
/ divisor
;
1576 uint32_t last_fraglen
= fraglen
+ len
% divisor
;
1577 uint32_t remain
= len
;
1579 // send the first packet
1580 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, fraglen
, s
, t
, PPPIP
, 0, bid
, MP_BEGIN
);
1582 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1585 update_session_out_stat(s
, sp
, fraglen
);
1588 while (remain
> last_fraglen
)
1590 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1591 s
= members
[b
->current_ses
];
1592 t
= session
[s
].tunnel
;
1594 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1595 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), fraglen
, s
, t
, PPPIP
, 0, bid
, 0);
1597 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1598 update_session_out_stat(s
, sp
, fraglen
);
1601 // send the last fragment
1602 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1603 s
= members
[b
->current_ses
];
1604 t
= session
[s
].tunnel
;
1606 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1607 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), remain
, s
, t
, PPPIP
, 0, bid
, MP_END
);
1609 tunnelsend(fragbuf
, remain
+ (p
-fragbuf
), t
); // send it...
1610 update_session_out_stat(s
, sp
, remain
);
1611 if (remain
!= last_fraglen
)
1612 LOG(3, s
, t
, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain
, last_fraglen
);
1616 // Send it as one frame
1617 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, bid
, MP_BOTH_BITS
);
1619 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1620 LOG(4, s
, t
, "MPPP: packet sent as one frame\n");
1621 update_session_out_stat(s
, sp
, len
);
1626 // Send it as one frame (NO MPPP Frame)
1627 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1629 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1630 update_session_out_stat(s
, sp
, len
);
1635 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1637 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), 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 controlt
*c
= controlnew(6); // sending HELLO
3506 controladd(c
, 0, t
); // send the message
3507 LOG(3, 0, t
, "Sending HELLO message\n");
3511 // Check for tunnel changes requested from the CLI
3512 if ((a
= cli_tunnel_actions
[t
].action
))
3514 cli_tunnel_actions
[t
].action
= 0;
3515 if (a
& CLI_TUN_KILL
)
3517 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
3518 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
3524 for (i
= 0; i
< r_slice
; i
++)
3530 if (!radius
[r
].state
)
3533 if (radius
[r
].retry
<= TIME
)
3540 for (i
= 0; i
< s_slice
; i
++)
3543 if (s
> config
->cluster_highest_sessionid
)
3546 if (!session
[s
].opened
) // Session isn't in use
3549 // check for expired sessions
3552 if (session
[s
].die
<= TIME
)
3554 sessionkill(s
, "Expired");
3561 if (sess_local
[s
].lcp
.restart
<= time_now
)
3563 int next_state
= session
[s
].ppp
.lcp
;
3564 switch (session
[s
].ppp
.lcp
)
3568 next_state
= RequestSent
;
3571 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
3573 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
3574 sendlcp(s
, session
[s
].tunnel
);
3575 change_state(s
, lcp
, next_state
);
3579 sessionshutdown(s
, "No response to LCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3580 STAT(session_timeout
);
3590 if (sess_local
[s
].ipcp
.restart
<= time_now
)
3592 int next_state
= session
[s
].ppp
.ipcp
;
3593 switch (session
[s
].ppp
.ipcp
)
3597 next_state
= RequestSent
;
3600 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
3602 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
3603 sendipcp(s
, session
[s
].tunnel
);
3604 change_state(s
, ipcp
, next_state
);
3608 sessionshutdown(s
, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3609 STAT(session_timeout
);
3619 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
3621 int next_state
= session
[s
].ppp
.ipv6cp
;
3622 switch (session
[s
].ppp
.ipv6cp
)
3626 next_state
= RequestSent
;
3629 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
3631 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
3632 sendipv6cp(s
, session
[s
].tunnel
);
3633 change_state(s
, ipv6cp
, next_state
);
3637 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
3638 change_state(s
, ipv6cp
, Stopped
);
3645 if (sess_local
[s
].ccp
.restart
<= time_now
)
3647 int next_state
= session
[s
].ppp
.ccp
;
3648 switch (session
[s
].ppp
.ccp
)
3652 next_state
= RequestSent
;
3655 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
3657 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
3658 sendccp(s
, session
[s
].tunnel
);
3659 change_state(s
, ccp
, next_state
);
3663 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
3664 change_state(s
, ccp
, Stopped
);
3671 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3672 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= config
->idle_echo_timeout
))
3674 sessionshutdown(s
, "No response to LCP ECHO requests.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3675 STAT(session_timeout
);
3680 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3681 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= config
->echo_timeout
) &&
3682 (time_now
- sess_local
[s
].last_echo
>= ECHO_TIMEOUT
))
3684 uint8_t b
[MAXETHER
];
3686 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
, 1, 0, 0);
3690 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
3691 *(uint16_t *)(q
+ 2) = htons(8); // Length
3692 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
3694 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
3695 (int)(time_now
- session
[s
].last_packet
));
3697 tunnelsend(b
, (q
- b
) + 8, session
[s
].tunnel
); // send it
3698 sess_local
[s
].last_echo
= time_now
;
3702 // Drop sessions who have reached session_timeout seconds
3703 if (session
[s
].session_timeout
)
3705 bundleidt bid
= session
[s
].bundle
;
3708 if (time_now
- bundle
[bid
].last_check
>= 1)
3710 bundle
[bid
].online_time
+= (time_now
- bundle
[bid
].last_check
) * bundle
[bid
].num_of_links
;
3711 bundle
[bid
].last_check
= time_now
;
3712 if (bundle
[bid
].online_time
>= session
[s
].session_timeout
)
3715 for (ses
= bundle
[bid
].num_of_links
- 1; ses
>= 0; ses
--)
3717 sessionshutdown(bundle
[bid
].members
[ses
], "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3724 else if (time_now
- session
[s
].opened
>= session
[s
].session_timeout
)
3726 sessionshutdown(s
, "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3732 // Drop sessions who have reached idle_timeout seconds
3733 if (session
[s
].last_data
&& session
[s
].idle_timeout
&& (time_now
- session
[s
].last_data
>= session
[s
].idle_timeout
))
3735 sessionshutdown(s
, "Idle Timeout Reached", CDN_ADMIN_DISC
, TERM_IDLE_TIMEOUT
);
3736 STAT(session_timeout
);
3741 // Check for actions requested from the CLI
3742 if ((a
= cli_session_actions
[s
].action
))
3746 cli_session_actions
[s
].action
= 0;
3747 if (a
& CLI_SESS_KILL
)
3749 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
3750 sessionshutdown(s
, "Requested by administrator.", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
3751 a
= 0; // dead, no need to check for other actions
3755 if (a
& CLI_SESS_NOSNOOP
)
3757 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
3758 session
[s
].snoop_ip
= 0;
3759 session
[s
].snoop_port
= 0;
3763 else if (a
& CLI_SESS_SNOOP
)
3765 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%u)\n",
3766 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
3767 cli_session_actions
[s
].snoop_port
);
3769 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
3770 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
3775 if (a
& CLI_SESS_NOTHROTTLE
)
3777 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
3778 throttle_session(s
, 0, 0);
3782 else if (a
& CLI_SESS_THROTTLE
)
3784 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3785 cli_session_actions
[s
].throttle_in
,
3786 cli_session_actions
[s
].throttle_out
);
3788 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3793 if (a
& CLI_SESS_NOFILTER
)
3795 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3796 filter_session(s
, 0, 0);
3800 else if (a
& CLI_SESS_FILTER
)
3802 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3803 cli_session_actions
[s
].filter_in
,
3804 cli_session_actions
[s
].filter_out
);
3806 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3812 cluster_send_session(s
);
3815 // RADIUS interim accounting
3816 if (config
->radius_accounting
&& config
->radius_interim
> 0
3817 && session
[s
].ip
&& !session
[s
].walled_garden
3818 && !sess_local
[s
].radius
// RADIUS already in progress
3819 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
3820 && session
[s
].flags
& SESSION_STARTED
)
3822 int rad
= radiusnew(s
);
3825 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3826 STAT(radius_overflow
);
3830 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3831 session
[s
].user
, session
[s
].unique_id
);
3833 radiussend(rad
, RADIUSINTERIM
);
3834 sess_local
[s
].last_interim
= time_now
;
3839 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3840 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3844 // Are we in the middle of a tunnel update, or radius
3847 static int still_busy(void)
3850 static clockt last_talked
= 0;
3851 static clockt start_busy_wait
= 0;
3854 static time_t stopped_bgp
= 0;
3859 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3861 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3862 if (bgp_peers
[i
].state
== Established
)
3863 bgp_stop(&bgp_peers
[i
]);
3865 stopped_bgp
= time_now
;
3867 if (!config
->cluster_iam_master
)
3869 // we don't want to become master
3870 cluster_send_ping(0);
3876 if (!config
->cluster_iam_master
&& time_now
< (stopped_bgp
+ QUIT_DELAY
))
3881 if (!config
->cluster_iam_master
)
3884 if (main_quit
== QUIT_SHUTDOWN
)
3886 static int dropped
= 0;
3891 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3892 for (i
= 1; i
< MAXTUNNEL
; i
++)
3893 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3894 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3900 if (start_busy_wait
== 0)
3901 start_busy_wait
= TIME
;
3903 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3905 if (!tunnel
[i
].controlc
)
3908 if (last_talked
!= TIME
)
3910 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i
);
3916 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3917 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3919 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3923 for (i
= 1; i
< MAXRADIUS
; i
++)
3925 if (radius
[i
].state
== RADIUSNULL
)
3927 if (radius
[i
].state
== RADIUSWAIT
)
3930 if (last_talked
!= TIME
)
3932 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i
, radius
[i
].session
);
3942 # include <sys/epoll.h>
3944 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3945 # include "fake_epoll.h"
3949 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac, pppoedisc, pppoesess
3952 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, pppoedisc, pppoesess
3956 // additional polled fds
3958 # define EXTRA_FDS BGP_NUM_PEERS
3960 # define EXTRA_FDS 0
3963 // main loop - gets packets on tun or udp and processes them
3964 static void mainloop(void)
3968 uint8_t *p
= buf
+ 24; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3969 // and the forwarded pppoe session
3970 int size_bufp
= sizeof(buf
) - 24;
3971 clockt next_cluster_ping
= 0; // send initial ping immediately
3972 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3973 int maxevent
= sizeof(events
)/sizeof(*events
);
3975 if ((epollfd
= epoll_create(maxevent
)) < 0)
3977 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3982 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",
3983 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
, nlfd
, udplacfd
, pppoediscfd
, pppoesessfd
);
3985 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",
3986 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
, nlfd
, pppoediscfd
, pppoesessfd
);
3989 /* setup our fds to poll for input */
3991 static struct event_data d
[BASE_FDS
];
3992 struct epoll_event e
;
3999 d
[i
].type
= FD_TYPE_CLI
;
4000 e
.data
.ptr
= &d
[i
++];
4001 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
4004 d
[i
].type
= FD_TYPE_CLUSTER
;
4005 e
.data
.ptr
= &d
[i
++];
4006 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
4008 d
[i
].type
= FD_TYPE_TUN
;
4009 e
.data
.ptr
= &d
[i
++];
4010 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
4012 d
[i
].type
= FD_TYPE_UDP
;
4013 e
.data
.ptr
= &d
[i
++];
4014 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
4016 d
[i
].type
= FD_TYPE_CONTROL
;
4017 e
.data
.ptr
= &d
[i
++];
4018 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
4020 d
[i
].type
= FD_TYPE_DAE
;
4021 e
.data
.ptr
= &d
[i
++];
4022 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
4024 d
[i
].type
= FD_TYPE_NETLINK
;
4025 e
.data
.ptr
= &d
[i
++];
4026 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, nlfd
, &e
);
4029 d
[i
].type
= FD_TYPE_UDPLAC
;
4030 e
.data
.ptr
= &d
[i
++];
4031 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udplacfd
, &e
);
4034 d
[i
].type
= FD_TYPE_PPPOEDISC
;
4035 e
.data
.ptr
= &d
[i
++];
4036 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoediscfd
, &e
);
4038 d
[i
].type
= FD_TYPE_PPPOESESS
;
4039 e
.data
.ptr
= &d
[i
++];
4040 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, pppoesessfd
, &e
);
4044 signal(SIGPIPE
, SIG_IGN
);
4045 bgp_setup(config
->as_number
);
4046 if (config
->bind_address
)
4047 bgp_add_route(config
->bind_address
, 0xffffffff);
4049 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
4051 if (config
->neighbour
[i
].name
[0])
4052 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
4053 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
4054 config
->neighbour
[i
].hold
, config
->neighbour
[i
].update_source
,
4055 0); /* 0 = routing disabled */
4059 while (!main_quit
|| still_busy())
4069 config
->reload_config
++;
4072 if (config
->reload_config
)
4074 config
->reload_config
= 0;
4082 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
4083 STAT(select_called
);
4088 if (errno
== EINTR
||
4089 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
4092 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
4098 struct sockaddr_in addr
;
4099 struct in_addr local
;
4104 int udplac_ready
= 0;
4105 int udplac_pkts
= 0;
4107 int pppoesess_ready
= 0;
4108 int pppoesess_pkts
= 0;
4110 int cluster_ready
= 0;
4113 int cluster_pkts
= 0;
4115 uint32_t bgp_events
[BGP_NUM_PEERS
];
4116 memset(bgp_events
, 0, sizeof(bgp_events
));
4119 for (c
= n
, i
= 0; i
< c
; i
++)
4121 struct event_data
*d
= events
[i
].data
.ptr
;
4125 case FD_TYPE_CLI
: // CLI connections
4129 alen
= sizeof(addr
);
4130 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
4136 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
4142 // these are handled below, with multiple interleaved reads
4143 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
4144 case FD_TYPE_TUN
: tun_ready
++; break;
4145 case FD_TYPE_UDP
: udp_ready
++; break;
4147 case FD_TYPE_UDPLAC
: udplac_ready
++; break;
4149 case FD_TYPE_PPPOESESS
: pppoesess_ready
++; break;
4151 case FD_TYPE_PPPOEDISC
: // pppoe discovery
4152 s
= read(pppoediscfd
, p
, size_bufp
);
4153 if (s
> 0) process_pppoe_disc(p
, s
);
4157 case FD_TYPE_CONTROL
: // nsctl commands
4158 alen
= sizeof(addr
);
4159 s
= recvfromto(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4160 if (s
> 0) processcontrol(buf
, s
, &addr
, alen
, &local
);
4164 case FD_TYPE_DAE
: // DAE requests
4165 alen
= sizeof(addr
);
4166 s
= recvfromto(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
4167 if (s
> 0) processdae(buf
, s
, &addr
, alen
, &local
);
4171 case FD_TYPE_RADIUS
: // RADIUS response
4172 alen
= sizeof(addr
);
4173 s
= recvfrom(radfds
[d
->index
], buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
4174 if (s
>= 0 && config
->cluster_iam_master
)
4176 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
4177 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
4178 processrad(buf
, s
, d
->index
);
4180 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4181 fmtaddr(addr
.sin_addr
.s_addr
, 0));
4189 bgp_events
[d
->index
] = events
[i
].events
;
4194 case FD_TYPE_NETLINK
:
4196 struct nlmsghdr
*nh
= (struct nlmsghdr
*)buf
;
4197 s
= netlink_recv(buf
, sizeof(buf
));
4198 if (nh
->nlmsg_type
== NLMSG_ERROR
)
4200 struct nlmsgerr
*errmsg
= NLMSG_DATA(nh
);
4203 if (errmsg
->msg
.nlmsg_seq
< min_initok_nlseqnum
)
4205 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg
[nh
->nlmsg_seq
], strerror(-errmsg
->error
));
4210 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg
->error
));
4215 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
);
4221 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
4226 bgp_process(bgp_events
);
4229 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
4234 alen
= sizeof(addr
);
4235 if ((s
= recvfrom(udpfd
, p
, size_bufp
, 0, (void *) &addr
, &alen
)) > 0)
4237 processudp(p
, s
, &addr
);
4250 alen
= sizeof(addr
);
4251 if ((s
= recvfrom(udplacfd
, p
, size_bufp
, 0, (void *) &addr
, &alen
)) > 0)
4253 if (!config
->disable_lac_func
)
4254 processudp(p
, s
, &addr
);
4268 if ((s
= read(tunfd
, p
, size_bufp
)) > 0)
4281 if (pppoesess_ready
)
4283 if ((s
= read(pppoesessfd
, p
, size_bufp
)) > 0)
4285 process_pppoe_sess(p
, s
);
4290 pppoesess_ready
= 0;
4298 alen
= sizeof(addr
);
4299 if ((s
= recvfrom(cluster_sockfd
, p
, size_bufp
, MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
4301 processcluster(p
, s
, addr
.sin_addr
.s_addr
);
4312 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
4313 STAT(multi_read_used
);
4315 if (c
>= config
->multi_read_count
)
4318 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d rmlns packets\n",
4319 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
, udplac_pkts
);
4321 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
4322 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
4324 STAT(multi_read_exceeded
);
4330 /* no event received, but timers could still have expired */
4331 bgp_process_peers_timers();
4336 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
4338 // Log current traffic stats
4339 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4340 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4341 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
4342 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
4343 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
4345 udp_tx
= udp_rx
= 0;
4346 udp_rx_pkt
= eth_rx_pkt
= 0;
4347 eth_tx
= eth_rx
= 0;
4350 if (config
->dump_speed
)
4351 printf("%s\n", config
->bandwidth
);
4353 // Update the internal time counter
4354 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4358 struct param_timer p
= { time_now
};
4359 run_plugins(PLUGIN_TIMER
, &p
);
4363 // Runs on every machine (master and slaves).
4364 if (next_cluster_ping
<= TIME
)
4366 // Check to see which of the cluster is still alive..
4368 cluster_send_ping(basetime
); // Only does anything if we're a slave
4369 cluster_check_master(); // ditto.
4371 cluster_heartbeat(); // Only does anything if we're a master.
4372 cluster_check_slaves(); // ditto.
4374 master_update_counts(); // If we're a slave, send our byte counters to our master.
4376 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
4377 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
4379 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
4382 if (!config
->cluster_iam_master
)
4385 // Run token bucket filtering queue..
4386 // Only run it every 1/10th of a second.
4388 static clockt last_run
= 0;
4389 if (last_run
!= TIME
)
4396 // Handle timeouts, retries etc.
4398 static double last_clean
= 0;
4402 TIME
= now(&this_clean
);
4403 diff
= this_clean
- last_clean
;
4405 // Run during idle time (after we've handled
4406 // all incoming packets) or every 1/10th sec
4407 if (!more
|| diff
> 0.1)
4409 regular_cleanups(diff
);
4410 last_clean
= this_clean
;
4414 if (*config
->accounting_dir
)
4416 static clockt next_acct
= 0;
4417 static clockt next_shut_acct
= 0;
4419 if (next_acct
<= TIME
)
4421 // Dump accounting data
4422 next_acct
= TIME
+ ACCT_TIME
;
4423 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4426 else if (next_shut_acct
<= TIME
)
4428 // Dump accounting data for shutdown sessions
4429 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4436 // Are we the master and shutting down??
4437 if (config
->cluster_iam_master
)
4438 cluster_heartbeat(); // Flush any queued changes..
4440 // Ok. Notify everyone we're shutting down. If we're
4441 // the master, this will force an election.
4442 cluster_send_ping(0);
4445 // Important!!! We MUST not process any packets past this point!
4446 LOG(1, 0, 0, "Shutdown complete\n");
4449 static void stripdomain(char *host
)
4453 if ((p
= strchr(host
, '.')))
4459 FILE *resolv
= fopen("/etc/resolv.conf", "r");
4465 while (fgets(buf
, sizeof(buf
), resolv
))
4467 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
4470 if (!isspace(buf
[6]))
4474 while (isspace(*b
)) b
++;
4479 while (*b
&& !isspace(*b
)) b
++;
4481 if (buf
[0] == 'd') // domain is canonical
4487 // first search line
4490 // hold, may be subsequent domain line
4491 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
4502 int hl
= strlen(host
);
4503 int dl
= strlen(domain
);
4504 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
4505 host
[hl
-dl
- 1] = 0;
4509 *p
= 0; // everything after first dot
4514 // Init data structures
4515 static void initdata(int optdebug
, char *optconfig
)
4519 if (!(config
= shared_malloc(sizeof(configt
))))
4521 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
4525 memset(config
, 0, sizeof(configt
));
4526 time(&config
->start_time
);
4527 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
4528 config
->debug
= optdebug
;
4529 config
->num_tbfs
= MAXTBFS
;
4530 config
->rl_rate
= 28; // 28kbps
4531 config
->cluster_mcast_ttl
= 1;
4532 config
->cluster_master_min_adv
= 1;
4533 config
->ppp_restart_time
= 3;
4534 config
->ppp_max_configure
= 10;
4535 config
->ppp_max_failure
= 5;
4536 config
->kill_timedout_sessions
= 1;
4537 strcpy(config
->random_device
, RANDOMDEVICE
);
4538 // Set default value echo_timeout and idle_echo_timeout
4539 config
->echo_timeout
= ECHO_TIMEOUT
;
4540 config
->idle_echo_timeout
= IDLE_ECHO_TIMEOUT
;
4542 log_stream
= stderr
;
4545 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
4547 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
4550 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
4553 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
4555 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
4558 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
4560 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
4563 if (!(bundle
= shared_malloc(sizeof(bundlet
) * MAXBUNDLE
)))
4565 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno
));
4568 if (!(frag
= shared_malloc(sizeof(fragmentationt
) * MAXBUNDLE
)))
4570 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno
));
4573 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
4575 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
4579 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
4581 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
4585 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
4587 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
4591 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
4593 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
4597 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
4599 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
4602 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
4604 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
4606 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
4609 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
4611 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
4613 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
4616 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
4618 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
4619 memset(bundle
, 0, sizeof(bundlet
) * MAXBUNDLE
);
4620 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
4621 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
4622 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
4624 // Put all the sessions on the free list marked as undefined.
4625 for (i
= 1; i
< MAXSESSION
; i
++)
4627 session
[i
].next
= i
+ 1;
4628 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
4630 session
[MAXSESSION
- 1].next
= 0;
4633 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4634 for (i
= 1; i
< MAXTUNNEL
; i
++)
4635 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
4637 for (i
= 1; i
< MAXBUNDLE
; i
++) {
4638 bundle
[i
].state
= BUNDLEUNDEF
;
4643 // Grab my hostname unless it's been specified
4644 gethostname(hostname
, sizeof(hostname
));
4645 stripdomain(hostname
);
4648 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
4651 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
4653 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
4659 lac_initremotelnsdata();
4663 static int assign_ip_address(sessionidt s
)
4667 time_t best_time
= time_now
;
4668 char *u
= session
[s
].user
;
4672 CSTAT(assign_ip_address
);
4674 for (i
= 1; i
< ip_pool_size
; i
++)
4676 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
4679 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
4686 if (ip_address_pool
[i
].last
< best_time
)
4689 if (!(best_time
= ip_address_pool
[i
].last
))
4690 break; // never used, grab this one
4696 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
4700 session
[s
].ip
= ip_address_pool
[best
].address
;
4701 session
[s
].ip_pool_index
= best
;
4702 ip_address_pool
[best
].assigned
= 1;
4703 ip_address_pool
[best
].last
= time_now
;
4704 ip_address_pool
[best
].session
= s
;
4705 if (session
[s
].walled_garden
)
4706 /* Don't track addresses of users in walled garden (note: this
4707 means that their address isn't "sticky" even if they get
4709 ip_address_pool
[best
].user
[0] = 0;
4711 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
4714 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
4715 reuse
? "Reusing" : "Allocating", best
);
4720 static void free_ip_address(sessionidt s
)
4722 int i
= session
[s
].ip_pool_index
;
4725 CSTAT(free_ip_address
);
4728 return; // what the?
4730 if (i
< 0) // Is this actually part of the ip pool?
4734 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
4736 ip_address_pool
[i
].assigned
= 0;
4737 ip_address_pool
[i
].session
= 0;
4738 ip_address_pool
[i
].last
= time_now
;
4742 // Fsck the address pool against the session table.
4743 // Normally only called when we become a master.
4745 // This isn't perfect: We aren't keep tracking of which
4746 // users used to have an IP address.
4748 void rebuild_address_pool(void)
4753 // Zero the IP pool allocation, and build
4754 // a map from IP address to pool index.
4755 for (i
= 1; i
< MAXIPPOOL
; ++i
)
4757 ip_address_pool
[i
].assigned
= 0;
4758 ip_address_pool
[i
].session
= 0;
4759 if (!ip_address_pool
[i
].address
)
4762 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
4765 for (i
= 0; i
< MAXSESSION
; ++i
)
4768 if (!(session
[i
].opened
&& session
[i
].ip
))
4771 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
4773 if (session
[i
].ip_pool_index
< 0)
4775 // Not allocated out of the pool.
4776 if (ipid
< 1) // Not found in the pool either? good.
4779 LOG(0, i
, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4780 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
4782 // Fall through and process it as part of the pool.
4786 if (ipid
> MAXIPPOOL
|| ipid
< 0)
4788 LOG(0, i
, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
4790 session
[i
].ip_pool_index
= ipid
;
4794 ip_address_pool
[ipid
].assigned
= 1;
4795 ip_address_pool
[ipid
].session
= i
;
4796 ip_address_pool
[ipid
].last
= time_now
;
4797 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4798 session
[i
].ip_pool_index
= ipid
;
4799 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
4804 // Fix the address pool to match a changed session.
4805 // (usually when the master sends us an update).
4806 static void fix_address_pool(int sid
)
4810 ipid
= session
[sid
].ip_pool_index
;
4812 if (ipid
> ip_pool_size
)
4813 return; // Ignore it. rebuild_address_pool will fix it up.
4815 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
4816 return; // Just ignore it. rebuild_address_pool will take care of it.
4818 ip_address_pool
[ipid
].assigned
= 1;
4819 ip_address_pool
[ipid
].session
= sid
;
4820 ip_address_pool
[ipid
].last
= time_now
;
4821 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4825 // Add a block of addresses to the IP pool to hand out.
4827 static void add_to_ip_pool(in_addr_t addr
, int prefixlen
)
4831 prefixlen
= 32; // Host route only.
4833 addr
&= 0xffffffff << (32 - prefixlen
);
4835 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
4838 for (i
= addr
; i
< addr
+(1<<(32-prefixlen
)); ++i
)
4840 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
4841 continue; // Skip 0 and broadcast addresses.
4843 ip_address_pool
[ip_pool_size
].address
= i
;
4844 ip_address_pool
[ip_pool_size
].assigned
= 0;
4846 if (ip_pool_size
>= MAXIPPOOL
)
4848 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
4854 // Initialize the IP address pool
4855 static void initippool()
4860 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
4862 if (!(f
= fopen(IPPOOLFILE
, "r")))
4864 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
4868 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
4871 buf
[4095] = 0; // Force it to be zero terminated/
4873 if (*buf
== '#' || *buf
== '\n')
4874 continue; // Skip comments / blank lines
4875 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
4876 if ((p
= (char *)strchr(buf
, ':')))
4880 src
= inet_addr(buf
);
4881 if (src
== INADDR_NONE
)
4883 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
4886 // This entry is for a specific IP only
4887 if (src
!= config
->bind_address
)
4892 if ((p
= (char *)strchr(pool
, '/')))
4896 in_addr_t start
= 0;
4898 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
4900 if (!*p
|| !(numbits
= atoi(p
)))
4902 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
4905 start
= ntohl(inet_addr(pool
));
4907 // Add a static route for this pool
4908 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4909 fmtaddr(htonl(start
), 0), numbits
);
4911 routeset(0, start
, numbits
, 0, 1);
4913 add_to_ip_pool(start
, numbits
);
4917 // It's a single ip address
4918 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
4922 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
4925 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
4927 struct sockaddr_in snoop_addr
= {0};
4928 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
4931 snoop_addr
.sin_family
= AF_INET
;
4932 snoop_addr
.sin_addr
.s_addr
= destination
;
4933 snoop_addr
.sin_port
= ntohs(port
);
4935 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size
,
4936 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
4937 htons(snoop_addr
.sin_port
));
4939 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
4940 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
4942 STAT(packets_snooped
);
4945 static int dump_session(FILE **f
, sessiont
*s
)
4948 if (!s
->opened
|| (!s
->ip
&& !s
->forwardtosession
) || !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4950 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4956 char filename
[1024];
4958 time_t now
= time(NULL
);
4960 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4961 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4963 if (!(*f
= fopen(filename
, "w")))
4965 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
4969 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
4970 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
4975 "# format: username ip qos uptxoctets downrxoctets\n",
4977 fmtaddr(config
->iftun_address
? config
->iftun_address
: my_address
, 0),
4982 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
4983 fprintf(*f
, "%s %s %d %u %u\n",
4984 s
->user
, // username
4985 fmtaddr(htonl(s
->ip
), 0), // ip
4986 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
4987 (uint32_t) s
->cin_delta
, // uptxoctets
4988 (uint32_t) s
->cout_delta
); // downrxoctets
4990 s
->cin_delta
= s
->cout_delta
= 0;
4995 static void dump_acct_info(int all
)
5001 CSTAT(dump_acct_info
);
5005 for (i
= 0; i
< shut_acct_n
; i
++)
5006 dump_session(&f
, &shut_acct
[i
]);
5012 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5013 dump_session(&f
, &session
[i
]);
5020 int main(int argc
, char *argv
[])
5024 char *optconfig
= CONFIGFILE
;
5026 time(&basetime
); // start clock
5029 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
5034 if (fork()) exit(0);
5036 freopen("/dev/null", "r", stdin
);
5037 freopen("/dev/null", "w", stdout
);
5038 freopen("/dev/null", "w", stderr
);
5047 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
5050 printf("Args are:\n"
5051 "\t-d\t\tDetach from terminal\n"
5052 "\t-c <file>\tConfig file\n"
5053 "\t-h <hostname>\tForce hostname\n"
5061 // Start the timer routine off
5063 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
5066 initdata(optdebug
, optconfig
);
5070 /* set hostname /after/ having read the config file */
5071 if (*config
->hostname
)
5072 strcpy(hostname
, config
->hostname
);
5073 cli_init_complete(hostname
);
5075 init_tbf(config
->num_tbfs
);
5077 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
5078 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
5079 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
5082 rlim
.rlim_cur
= RLIM_INFINITY
;
5083 rlim
.rlim_max
= RLIM_INFINITY
;
5084 // Remove the maximum core size
5085 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
5086 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
5088 // Make core dumps go to /tmp
5092 if (config
->scheduler_fifo
)
5095 struct sched_param params
= {0};
5096 params
.sched_priority
= 1;
5098 if (get_nprocs() < 2)
5100 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5101 config
->scheduler_fifo
= 0;
5105 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
5107 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5111 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
5112 config
->scheduler_fifo
= 0;
5119 /* Set up the cluster communications port. */
5120 if (cluster_init() < 0)
5124 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevicename
);
5126 if (*config
->pppoe_if_to_bind
)
5129 LOG(1, 0, 0, "Set up on pppoe interface %s\n", config
->pppoe_if_to_bind
);
5137 unsigned seed
= time_now
^ getpid();
5138 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
5142 signal(SIGHUP
, sighup_handler
);
5143 signal(SIGCHLD
, sigchild_handler
);
5144 signal(SIGTERM
, shutdown_handler
);
5145 signal(SIGINT
, shutdown_handler
);
5146 signal(SIGQUIT
, shutdown_handler
);
5148 // Prevent us from getting paged out
5149 if (config
->lock_pages
)
5151 if (!mlockall(MCL_CURRENT
))
5152 LOG(1, 0, 0, "Locking pages into memory\n");
5154 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
5159 /* remove plugins (so cleanup code gets run) */
5162 // Remove the PID file if we wrote it
5163 if (config
->wrote_pid
&& *config
->pid_file
== '/')
5164 unlink(config
->pid_file
);
5166 /* kill CLI children */
5167 signal(SIGTERM
, SIG_IGN
);
5172 static void sighup_handler(int sig
)
5177 static void shutdown_handler(int sig
)
5179 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
5182 static void sigchild_handler(int sig
)
5184 while (waitpid(-1, NULL
, WNOHANG
) > 0)
5188 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
5191 *challenge_response
= NULL
;
5193 if (!*config
->l2tp_secret
)
5195 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5199 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5201 *challenge_response
= calloc(17, 1);
5204 MD5_Update(&ctx
, &id
, 1);
5205 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5206 MD5_Update(&ctx
, challenge
, challenge_length
);
5207 MD5_Final(*challenge_response
, &ctx
);
5212 static int facility_value(char *name
)
5215 for (i
= 0; facilitynames
[i
].c_name
; i
++)
5217 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
5218 return facilitynames
[i
].c_val
;
5223 static void update_config()
5227 static int timeout
= 0;
5228 static int interval
= 0;
5235 if (log_stream
!= stderr
)
5241 if (*config
->log_filename
)
5243 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
5245 char *p
= config
->log_filename
+ 7;
5248 openlog("l2tpns", LOG_PID
, facility_value(p
));
5252 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
5254 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
5256 fseek(log_stream
, 0, SEEK_END
);
5257 setbuf(log_stream
, NULL
);
5261 log_stream
= stderr
;
5262 setbuf(log_stream
, NULL
);
5268 log_stream
= stderr
;
5269 setbuf(log_stream
, NULL
);
5272 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5273 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5275 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
5276 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
5277 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
5279 // reset MRU/MSS globals
5280 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
5281 if (MRU
> PPPoE_MRU
)
5284 MSS
= MRU
- TCP_HDRS
;
5287 config
->numradiusservers
= 0;
5288 for (i
= 0; i
< MAXRADSERVER
; i
++)
5289 if (config
->radiusserver
[i
])
5291 config
->numradiusservers
++;
5292 // Set radius port: if not set, take the port from the
5293 // first radius server. For the first radius server,
5294 // take the #defined default value from l2tpns.h
5296 // test twice, In case someone works with
5297 // a secondary radius server without defining
5298 // a primary one, this will work even then.
5299 if (i
> 0 && !config
->radiusport
[i
])
5300 config
->radiusport
[i
] = config
->radiusport
[i
-1];
5301 if (!config
->radiusport
[i
])
5302 config
->radiusport
[i
] = RADPORT
;
5305 if (!config
->numradiusservers
)
5306 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5308 // parse radius_authtypes_s
5309 config
->radius_authtypes
= config
->radius_authprefer
= 0;
5310 p
= config
->radius_authtypes_s
;
5313 char *s
= strpbrk(p
, " \t,");
5319 while (*s
== ' ' || *s
== '\t')
5326 if (!strncasecmp("chap", p
, strlen(p
)))
5328 else if (!strncasecmp("pap", p
, strlen(p
)))
5331 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
5333 config
->radius_authtypes
|= type
;
5334 if (!config
->radius_authprefer
)
5335 config
->radius_authprefer
= type
;
5340 if (!config
->radius_authtypes
)
5342 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5343 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
5346 // normalise radius_authtypes_s
5347 if (config
->radius_authprefer
== AUTHPAP
)
5349 strcpy(config
->radius_authtypes_s
, "pap");
5350 if (config
->radius_authtypes
& AUTHCHAP
)
5351 strcat(config
->radius_authtypes_s
, ", chap");
5355 strcpy(config
->radius_authtypes_s
, "chap");
5356 if (config
->radius_authtypes
& AUTHPAP
)
5357 strcat(config
->radius_authtypes_s
, ", pap");
5360 if (!config
->radius_dae_port
)
5361 config
->radius_dae_port
= DAEPORT
;
5364 if(!config
->bind_portremotelns
)
5365 config
->bind_portremotelns
= L2TPLACPORT
;
5366 if(!config
->bind_address_remotelns
)
5367 config
->bind_address_remotelns
= INADDR_ANY
;
5369 if(!config
->iftun_address
)
5370 config
->iftun_address
= config
->bind_address
;
5372 if (!*config
->pppoe_ac_name
)
5373 strncpy(config
->pppoe_ac_name
, DEFAULT_PPPOE_AC_NAME
, sizeof(config
->pppoe_ac_name
) - 1);
5375 // re-initialise the random number source
5376 initrandom(config
->random_device
);
5379 for (i
= 0; i
< MAXPLUGINS
; i
++)
5381 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
5384 if (*config
->plugins
[i
])
5387 add_plugin(config
->plugins
[i
]);
5389 else if (*config
->old_plugins
[i
])
5392 remove_plugin(config
->old_plugins
[i
]);
5397 guest_accounts_num
= 0;
5398 char *p2
= config
->guest_user
;
5401 char *s
= strpbrk(p2
, " \t,");
5405 while (*s
== ' ' || *s
== '\t')
5412 strcpy(guest_users
[guest_accounts_num
], p2
);
5413 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num
, guest_users
[guest_accounts_num
]);
5414 guest_accounts_num
++;
5417 // Rebuild the guest_user array
5418 strcpy(config
->guest_user
, "");
5420 for (ui
=0; ui
<guest_accounts_num
; ui
++)
5422 strcat(config
->guest_user
, guest_users
[ui
]);
5423 if (ui
<guest_accounts_num
-1)
5425 strcat(config
->guest_user
, ",");
5430 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
5431 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
5432 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
5433 if (!*config
->cluster_interface
)
5434 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
5436 if (!config
->cluster_hb_interval
)
5437 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
5439 if (!config
->cluster_hb_timeout
)
5440 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
5442 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
5444 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5445 // late, ensure we're sufficiently larger than that
5446 int t
= 4 * config
->cluster_hb_interval
+ 11;
5448 if (config
->cluster_hb_timeout
< t
)
5450 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
5451 config
->cluster_hb_timeout
= t
;
5454 // Push timing changes to the slaves immediately if we're the master
5455 if (config
->cluster_iam_master
)
5456 cluster_heartbeat();
5458 interval
= config
->cluster_hb_interval
;
5459 timeout
= config
->cluster_hb_timeout
;
5463 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
5466 if ((f
= fopen(config
->pid_file
, "w")))
5468 fprintf(f
, "%d\n", getpid());
5470 config
->wrote_pid
= 1;
5474 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
5479 static void read_config_file()
5483 if (!config
->config_file
) return;
5484 if (!(f
= fopen(config
->config_file
, "r")))
5486 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
5490 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
5492 LOG(3, 0, 0, "Done reading config file\n");
5496 int sessionsetup(sessionidt s
, tunnelidt t
)
5498 // A session now exists, set it up
5504 CSTAT(sessionsetup
);
5506 LOG(3, s
, t
, "Doing session setup for session\n");
5508 // Join a bundle if the MRRU option is accepted
5509 if(session
[s
].mrru
> 0 && session
[s
].bundle
== 0)
5511 LOG(3, s
, t
, "This session can be part of multilink bundle\n");
5512 if (join_bundle(s
) > 0)
5513 cluster_send_bundle(session
[s
].bundle
);
5516 LOG(0, s
, t
, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5517 sessionshutdown(s
, "Mismaching mssf option.", CDN_NONE
, TERM_SERVICE_UNAVAILABLE
);
5524 assign_ip_address(s
);
5527 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
5528 sessionshutdown(s
, "No IP addresses available.", CDN_TRY_ANOTHER
, TERM_SERVICE_UNAVAILABLE
);
5531 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
5532 fmtaddr(htonl(session
[s
].ip
), 0));
5535 // Make sure this is right
5536 session
[s
].tunnel
= t
;
5538 // zap old sessions with same IP and/or username
5539 // Don't kill gardened sessions - doing so leads to a DoS
5540 // from someone who doesn't need to know the password
5543 user
= session
[s
].user
;
5544 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5546 if (i
== s
) continue;
5547 if (!session
[s
].opened
) break;
5548 // Allow duplicate sessions for multilink ones of the same bundle.
5549 if (session
[s
].bundle
&& session
[i
].bundle
&& session
[s
].bundle
== session
[i
].bundle
) continue;
5551 if (ip
== session
[i
].ip
)
5553 sessionshutdown(i
, "Duplicate IP address", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5557 if (config
->allow_duplicate_users
) continue;
5558 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
5562 for (gu
= 0; gu
< guest_accounts_num
; gu
++)
5564 if (!strcasecmp(user
, guest_users
[gu
]))
5570 if (found
) continue;
5572 // Drop the new session in case of duplicate sessionss, not the old one.
5573 if (!strcasecmp(user
, session
[i
].user
))
5574 sessionshutdown(i
, "Duplicate session for users", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
5578 // no need to set a route for the same IP address of the bundle
5579 if (!session
[s
].bundle
|| (bundle
[session
[s
].bundle
].num_of_links
== 1))
5583 // Add the route for this session.
5584 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
5586 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
5587 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
5590 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 1);
5593 // Static IPs need to be routed if not already
5594 // convered by a Framed-Route. Anything else is part
5595 // of the IP address pool and is already routed, it
5596 // just needs to be added to the IP cache.
5597 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5598 if (session
[s
].ip_pool_index
== -1) // static ip
5600 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
5603 cache_ipmap(session
[s
].ip
, s
);
5606 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
5607 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
5609 // Run the plugin's against this new session.
5611 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
5612 run_plugins(PLUGIN_NEW_SESSION
, &data
);
5615 // Allocate TBFs if throttled
5616 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
5617 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
5619 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
5621 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
5622 fmtaddr(htonl(session
[s
].ip
), 0),
5623 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
5625 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
5627 return 1; // RADIUS OK and IP allocated, done...
5631 // This session just got dropped on us by the master or something.
5632 // Make sure our tables up up to date...
5634 int load_session(sessionidt s
, sessiont
*new)
5640 if (new->ip_pool_index
>= MAXIPPOOL
||
5641 new->tunnel
>= MAXTUNNEL
)
5643 LOG(0, s
, 0, "Strange session update received!\n");
5644 // FIXME! What to do here?
5649 // Ok. All sanity checks passed. Now we're committed to
5650 // loading the new session.
5653 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
5655 // See if routes/ip cache need updating
5656 if (new->ip
!= session
[s
].ip
)
5659 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
5660 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
5661 new->route
[i
].prefixlen
!= session
[s
].route
[i
].prefixlen
)
5669 // remove old routes...
5670 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
5672 if ((session
[s
].ip
>> (32-session
[s
].route
[i
].prefixlen
)) ==
5673 (session
[s
].route
[i
].ip
>> (32-session
[s
].route
[i
].prefixlen
)))
5676 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].prefixlen
, 0, 0);
5682 if (session
[s
].ip_pool_index
== -1) // static IP
5684 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
5686 else // It's part of the IP pool, remove it manually.
5687 uncache_ipmap(session
[s
].ip
);
5692 // add new routes...
5693 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
5695 if ((new->ip
>> (32-new->route
[i
].prefixlen
)) ==
5696 (new->route
[i
].ip
>> (32-new->route
[i
].prefixlen
)))
5699 routeset(s
, new->route
[i
].ip
, new->route
[i
].prefixlen
, 0, 1);
5705 // If there's a new one, add it.
5706 if (new->ip_pool_index
== -1)
5708 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
5711 cache_ipmap(new->ip
, s
);
5716 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5717 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
5720 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
5722 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %u\n", (int) new->filter_in
);
5726 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
5728 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %u\n", (int) new->filter_out
);
5729 new->filter_out
= 0;
5732 if (new->filter_in
!= session
[s
].filter_in
)
5734 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
5735 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
5738 if (new->filter_out
!= session
[s
].filter_out
)
5740 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
5741 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
5744 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
5745 // for walking the sessions to forward byte counts to the master.
5746 config
->cluster_highest_sessionid
= s
;
5748 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
5750 // Do fixups into address pool.
5751 if (new->ip_pool_index
!= -1)
5752 fix_address_pool(s
);
5757 static void initplugins()
5761 loaded_plugins
= ll_init();
5762 // Initialize the plugins to nothing
5763 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
5764 plugins
[i
] = ll_init();
5767 static void *open_plugin(char *plugin_name
, int load
)
5769 char path
[256] = "";
5771 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
5772 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
5773 return dlopen(path
, RTLD_NOW
);
5776 // plugin callback to get a config value
5777 static void *getconfig(char *key
, enum config_typet type
)
5781 for (i
= 0; config_values
[i
].key
; i
++)
5783 if (!strcmp(config_values
[i
].key
, key
))
5785 if (config_values
[i
].type
== type
)
5786 return ((void *) config
) + config_values
[i
].offset
;
5788 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5789 key
, type
, config_values
[i
].type
);
5795 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
5799 static int add_plugin(char *plugin_name
)
5801 static struct pluginfuncs funcs
= {
5806 sessiontbysessionidt
,
5807 sessionidtbysessiont
,
5814 cluster_send_session
,
5817 void *p
= open_plugin(plugin_name
, 1);
5818 int (*initfunc
)(struct pluginfuncs
*);
5823 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5827 if (ll_contains(loaded_plugins
, p
))
5830 return 0; // already loaded
5834 int *v
= dlsym(p
, "plugin_api_version");
5835 if (!v
|| *v
!= PLUGIN_API_VERSION
)
5837 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5843 if ((initfunc
= dlsym(p
, "plugin_init")))
5845 if (!initfunc(&funcs
))
5847 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5853 ll_push(loaded_plugins
, p
);
5855 for (i
= 0; i
< max_plugin_functions
; i
++)
5858 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5860 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
5861 ll_push(plugins
[i
], x
);
5865 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
5869 static void run_plugin_done(void *plugin
)
5871 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
5877 static int remove_plugin(char *plugin_name
)
5879 void *p
= open_plugin(plugin_name
, 0);
5885 if (ll_contains(loaded_plugins
, p
))
5888 for (i
= 0; i
< max_plugin_functions
; i
++)
5891 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5892 ll_delete(plugins
[i
], x
);
5895 ll_delete(loaded_plugins
, p
);
5901 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
5905 int run_plugins(int plugin_type
, void *data
)
5907 int (*func
)(void *data
);
5909 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
5910 return PLUGIN_RET_ERROR
;
5912 ll_reset(plugins
[plugin_type
]);
5913 while ((func
= ll_next(plugins
[plugin_type
])))
5917 if (r
!= PLUGIN_RET_OK
)
5918 return r
; // stop here
5921 return PLUGIN_RET_OK
;
5924 static void plugins_done()
5928 ll_reset(loaded_plugins
);
5929 while ((p
= ll_next(loaded_plugins
)))
5933 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
5935 struct nsctl request
;
5936 struct nsctl response
;
5937 int type
= unpack_control(&request
, buf
, len
);
5941 if (log_stream
&& config
->debug
>= 4)
5945 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5946 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
5950 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5951 dump_control(&request
, log_stream
);
5957 case NSCTL_REQ_LOAD
:
5958 if (request
.argc
!= 1)
5960 response
.type
= NSCTL_RES_ERR
;
5962 response
.argv
[0] = "name of plugin required";
5964 else if ((r
= add_plugin(request
.argv
[0])) < 1)
5966 response
.type
= NSCTL_RES_ERR
;
5968 response
.argv
[0] = !r
5969 ? "plugin already loaded"
5970 : "error loading plugin";
5974 response
.type
= NSCTL_RES_OK
;
5980 case NSCTL_REQ_UNLOAD
:
5981 if (request
.argc
!= 1)
5983 response
.type
= NSCTL_RES_ERR
;
5985 response
.argv
[0] = "name of plugin required";
5987 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
5989 response
.type
= NSCTL_RES_ERR
;
5991 response
.argv
[0] = !r
5992 ? "plugin not loaded"
5993 : "plugin not found";
5997 response
.type
= NSCTL_RES_OK
;
6003 case NSCTL_REQ_HELP
:
6004 response
.type
= NSCTL_RES_OK
;
6007 ll_reset(loaded_plugins
);
6008 while ((p
= ll_next(loaded_plugins
)))
6010 char **help
= dlsym(p
, "plugin_control_help");
6011 while (response
.argc
< 0xff && help
&& *help
)
6012 response
.argv
[response
.argc
++] = *help
++;
6017 case NSCTL_REQ_CONTROL
:
6019 struct param_control param
= {
6020 config
->cluster_iam_master
,
6027 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
6029 if (r
== PLUGIN_RET_ERROR
)
6031 response
.type
= NSCTL_RES_ERR
;
6033 response
.argv
[0] = param
.additional
6035 : "error returned by plugin";
6037 else if (r
== PLUGIN_RET_NOTMASTER
)
6039 static char msg
[] = "must be run on master: 000.000.000.000";
6041 response
.type
= NSCTL_RES_ERR
;
6043 if (config
->cluster_master_address
)
6045 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
6046 response
.argv
[0] = msg
;
6050 response
.argv
[0] = "must be run on master: none elected";
6053 else if (!(param
.response
& NSCTL_RESPONSE
))
6055 response
.type
= NSCTL_RES_ERR
;
6057 response
.argv
[0] = param
.response
6058 ? "unrecognised response value from plugin"
6059 : "unhandled action";
6063 response
.type
= param
.response
;
6065 if (param
.additional
)
6068 response
.argv
[0] = param
.additional
;
6076 response
.type
= NSCTL_RES_ERR
;
6078 response
.argv
[0] = "error unpacking control packet";
6081 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
6084 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
6088 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
6091 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
6092 if (log_stream
&& config
->debug
>= 4)
6094 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
6095 dump_control(&response
, log_stream
);
6099 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6100 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
6105 static tunnelidt
new_tunnel()
6108 for (i
= 1; i
< MAXTUNNEL
; i
++)
6110 if ((tunnel
[i
].state
== TUNNELFREE
) && (i
!= TUNNEL_ID_PPPOE
))
6112 LOG(4, 0, i
, "Assigning tunnel ID %u\n", i
);
6113 if (i
> config
->cluster_highest_tunnelid
)
6114 config
->cluster_highest_tunnelid
= i
;
6118 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6123 // We're becoming the master. Do any required setup..
6125 // This is principally telling all the plugins that we're
6126 // now a master, and telling them about all the sessions
6127 // that are active too..
6129 void become_master(void)
6132 static struct event_data d
[RADIUS_FDS
];
6133 struct epoll_event e
;
6135 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
6137 // running a bunch of iptables commands is slow and can cause
6138 // the master to drop tunnels on takeover--kludge around the
6139 // problem by forking for the moment (note: race)
6140 if (!fork_and_close())
6142 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6144 if (!session
[s
].opened
) // Not an in-use session.
6147 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
6154 for (i
= 0; i
< RADIUS_FDS
; i
++)
6156 d
[i
].type
= FD_TYPE_RADIUS
;
6160 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
6164 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
6170 if (CLI_HELP_REQUESTED
)
6171 return CLI_HELP_NO_ARGS
;
6174 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6176 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6179 if (!session
[s
].opened
)
6182 idle
= time_now
- session
[s
].last_data
;
6183 idle
/= 5 ; // In multiples of 5 seconds.
6193 for (i
= 0; i
< 63; ++i
)
6195 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6197 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
6198 cli_print(cli
, "%d total sessions open.", count
);
6202 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
6208 if (CLI_HELP_REQUESTED
)
6209 return CLI_HELP_NO_ARGS
;
6212 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
6214 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
6217 if (!session
[s
].opened
)
6220 d
= time_now
- session
[s
].opened
;
6223 while (d
> 1 && open
< 32)
6233 for (i
= 0; i
< 30; ++i
)
6235 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
6238 cli_print(cli
, "%d total sessions open.", count
);
6244 * This unencodes the AVP using the L2TP secret and the previously
6245 * stored random vector. It overwrites the hidden data with the
6246 * unhidden AVP subformat.
6248 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
6254 uint16_t m
= htons(type
);
6256 // Compute initial pad
6258 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
6259 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6260 MD5_Update(&ctx
, vector
, vec_len
);
6261 MD5_Final(digest
, &ctx
);
6263 // pointer to last decoded 16 octets
6268 // calculate a new pad based on the last decoded block
6269 if (d
>= sizeof(digest
))
6272 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
6273 MD5_Update(&ctx
, last
, sizeof(digest
));
6274 MD5_Final(digest
, &ctx
);
6280 *value
++ ^= digest
[d
++];
6285 int find_filter(char const *name
, size_t len
)
6290 for (i
= 0; i
< MAXFILTER
; i
++)
6292 if (!*ip_filters
[i
].name
)
6300 if (strlen(ip_filters
[i
].name
) != len
)
6303 if (!strncmp(ip_filters
[i
].name
, name
, len
))
6310 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
6314 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
6315 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
6316 case FILTER_PORT_OP_GT
: return port
> p
->port
;
6317 case FILTER_PORT_OP_LT
: return port
< p
->port
;
6318 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
6324 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
6328 case FILTER_FLAG_OP_ANY
:
6329 return (flags
& sflags
) || (~flags
& cflags
);
6331 case FILTER_FLAG_OP_ALL
:
6332 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
6334 case FILTER_FLAG_OP_EST
:
6335 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
6341 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
6343 uint16_t frag_offset
;
6347 uint16_t src_port
= 0;
6348 uint16_t dst_port
= 0;
6350 ip_filter_rulet
*rule
;
6352 if (len
< 20) // up to end of destination address
6355 if ((*buf
>> 4) != 4) // IPv4
6358 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
6360 src_ip
= *(in_addr_t
*) (buf
+ 12);
6361 dst_ip
= *(in_addr_t
*) (buf
+ 16);
6363 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
6365 int l
= (buf
[0] & 0xf) * 4; // length of IP header
6366 if (len
< l
+ 4) // ports
6369 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
6370 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
6371 if (proto
== IPPROTO_TCP
)
6373 if (len
< l
+ 14) // flags
6376 flags
= buf
[l
+ 13] & 0x3f;
6380 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
6382 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
6385 if (rule
->src_wild
!= INADDR_BROADCAST
&&
6386 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
6389 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
6390 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
6395 // layer 4 deny rules are skipped
6396 if (rule
->action
== FILTER_ACTION_DENY
&&
6397 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
6405 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
6407 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
6410 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
6413 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
6414 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
6421 return rule
->action
== FILTER_ACTION_PERMIT
;
6430 tunnelidt
lac_new_tunnel()
6432 return new_tunnel();
6435 void lac_tunnelclear(tunnelidt t
)
6440 void lac_send_SCCRQ(tunnelidt t
, uint8_t * auth
, unsigned int auth_len
)
6442 uint16_t version
= 0x0100; // protocol version
6444 tunnel
[t
].state
= TUNNELOPENING
;
6446 // Sent SCCRQ - Start Control Connection Request
6447 controlt
*c
= controlnew(1); // sending SCCRQ
6448 controls(c
, 7, hostname
, 1); // host name
6449 controls(c
, 8, Vendor_name
, 1); // Vendor name
6450 control16(c
, 2, version
, 1); // protocol version
6451 control32(c
, 3, 3, 1); // framing Capabilities
6452 control16(c
, 9, t
, 1); // assigned tunnel
6453 controlb(c
, 11, (uint8_t *) auth
, auth_len
, 1); // CHAP Challenge
6454 LOG(3, 0, t
, "Sent SCCRQ to REMOTE LNS\n");
6455 controladd(c
, 0, t
); // send
6458 void lac_send_ICRQ(tunnelidt t
, sessionidt s
)
6460 // Sent ICRQ Incoming-call-request
6461 controlt
*c
= controlnew(10); // ICRQ
6463 control16(c
, 14, s
, 1); // assigned sesion
6464 call_serial_number
++;
6465 control32(c
, 15, call_serial_number
, 1); // call serial number
6466 LOG(3, s
, t
, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel
[t
].far
);
6467 controladd(c
, 0, t
); // send
6470 void lac_tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
6472 tunnelshutdown(t
, reason
, result
, error
, msg
);