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"
57 configt
*config
= NULL
; // all configuration
58 int nlfd
= -1; // netlink socket
59 int tunfd
= -1; // tun interface file handle. (network device)
60 int udpfd
= -1; // UDP file handle
61 int controlfd
= -1; // Control signal handle
62 int clifd
= -1; // Socket listening for CLI connections.
63 int daefd
= -1; // Socket listening for DAE connections.
64 int snoopfd
= -1; // UDP file handle for sending out intercept data
65 int *radfds
= NULL
; // RADIUS requests file handles
66 int rand_fd
= -1; // Random data source
67 int cluster_sockfd
= -1; // Intra-cluster communications socket.
68 int epollfd
= -1; // event polling
69 time_t basetime
= 0; // base clock
70 char hostname
[MAXHOSTNAME
] = ""; // us.
71 static int tunidx
; // ifr_ifindex of tun device
72 int nlseqnum
= 0; // netlink sequence number
73 int min_initok_nlseqnum
= 0; // minimun seq number for messages after init is ok
74 static int syslog_log
= 0; // are we logging to syslog
75 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
76 uint32_t last_id
= 0; // Unique ID for radius accounting
78 char guest_users
[10][32]; // Array of guest users
79 int guest_accounts_num
= 0; // Number of guest users
81 // calculated from config->l2tp_mtu
82 uint16_t MRU
= 0; // PPP MRU
83 uint16_t MSS
= 0; // TCP MSS
85 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
86 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
91 } ip_hash
[256]; // Mapping from IP address to session structures.
95 struct ipv6radix
*branch
;
96 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
99 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
100 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
103 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
104 time_t time_now
= 0; // Current time in seconds since epoch.
105 uint64_t time_now_ms
= 0; // Current time in milliseconds since epoch.
106 static char time_now_string
[64] = {0}; // Current time as a string.
107 static int time_changed
= 0; // time_now changed
108 char main_quit
= 0; // True if we're in the process of exiting.
109 static char main_reload
= 0; // Re-load pending
110 linked_list
*loaded_plugins
;
111 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
113 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
114 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
116 config_descriptt config_values
[] = {
117 CONFIG("debug", debug
, INT
),
118 CONFIG("log_file", log_filename
, STRING
),
119 CONFIG("pid_file", pid_file
, STRING
),
120 CONFIG("random_device", random_device
, STRING
),
121 CONFIG("l2tp_secret", l2tp_secret
, STRING
),
122 CONFIG("l2tp_mtu", l2tp_mtu
, INT
),
123 CONFIG("ppp_restart_time", ppp_restart_time
, INT
),
124 CONFIG("ppp_max_configure", ppp_max_configure
, INT
),
125 CONFIG("ppp_max_failure", ppp_max_failure
, INT
),
126 CONFIG("primary_dns", default_dns1
, IPv4
),
127 CONFIG("secondary_dns", default_dns2
, IPv4
),
128 CONFIG("primary_radius", radiusserver
[0], IPv4
),
129 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
130 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
131 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
132 CONFIG("radius_accounting", radius_accounting
, BOOL
),
133 CONFIG("radius_interim", radius_interim
, INT
),
134 CONFIG("radius_secret", radiussecret
, STRING
),
135 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
136 CONFIG("radius_dae_port", radius_dae_port
, SHORT
),
137 CONFIG("radius_bind_min", radius_bind_min
, SHORT
),
138 CONFIG("radius_bind_max", radius_bind_max
, SHORT
),
139 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
140 CONFIG("kill_timedout_sessions", kill_timedout_sessions
, BOOL
),
141 CONFIG("guest_account", guest_user
, STRING
),
142 CONFIG("bind_address", bind_address
, IPv4
),
143 CONFIG("peer_address", peer_address
, IPv4
),
144 CONFIG("send_garp", send_garp
, BOOL
),
145 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
146 CONFIG("throttle_buckets", num_tbfs
, INT
),
147 CONFIG("accounting_dir", accounting_dir
, STRING
),
148 CONFIG("dump_speed", dump_speed
, BOOL
),
149 CONFIG("multi_read_count", multi_read_count
, INT
),
150 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
151 CONFIG("lock_pages", lock_pages
, BOOL
),
152 CONFIG("icmp_rate", icmp_rate
, INT
),
153 CONFIG("packet_limit", max_packets
, INT
),
154 CONFIG("cluster_address", cluster_address
, IPv4
),
155 CONFIG("cluster_interface", cluster_interface
, STRING
),
156 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl
, INT
),
157 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
158 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
159 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
160 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
161 CONFIG("cli_bind_address", cli_bind_address
, IPv4
),
162 CONFIG("hostname", hostname
, STRING
),
163 CONFIG("nexthop_address", nexthop_address
, IPv4
),
164 CONFIG("nexthop6_address", nexthop6_address
, IPv6
),
165 CONFIG("echo_timeout", echo_timeout
, INT
),
166 CONFIG("idle_echo_timeout", idle_echo_timeout
, INT
),
170 static char *plugin_functions
[] = {
175 "plugin_new_session",
176 "plugin_kill_session",
178 "plugin_radius_response",
179 "plugin_radius_reset",
180 "plugin_radius_account",
181 "plugin_become_master",
182 "plugin_new_session_master",
185 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
187 // Counters for shutdown sessions
188 static sessiont shut_acct
[8192];
189 static sessionidt shut_acct_n
= 0;
191 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
192 bundlet
*bundle
= NULL
; // Array of bundle structures.
193 fragmentationt
*frag
= NULL
; // Array of fragmentation structures.
194 sessiont
*session
= NULL
; // Array of session structures.
195 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
196 radiust
*radius
= NULL
; // Array of radius structures.
197 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
198 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
199 static controlt
*controlfree
= 0;
200 struct Tstats
*_statistics
= NULL
;
202 struct Tringbuffer
*ringbuffer
= NULL
;
205 static ssize_t
netlink_send(struct nlmsghdr
*nh
);
206 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
);
207 static void cache_ipmap(in_addr_t ip
, sessionidt s
);
208 static void uncache_ipmap(in_addr_t ip
);
209 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
);
210 static void free_ip_address(sessionidt s
);
211 static void dump_acct_info(int all
);
212 static void sighup_handler(int sig
);
213 static void shutdown_handler(int sig
);
214 static void sigchild_handler(int sig
);
215 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
);
216 static void update_config(void);
217 static void read_config_file(void);
218 static void initplugins(void);
219 static int add_plugin(char *plugin_name
);
220 static int remove_plugin(char *plugin_name
);
221 static void plugins_done(void);
222 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
);
223 static tunnelidt
new_tunnel(void);
224 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
225 static void bundleclear(bundleidt b
);
227 // on slaves, alow BGP to withdraw cleanly before exiting
230 // quit actions (master)
231 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
232 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
234 // return internal time (10ths since process startup), set f if given
235 // as a side-effect sets time_now, and time_changed
236 static clockt
now(double *f
)
240 if (f
) *f
= t
.tv_sec
+ t
.tv_usec
/ 1000000.0;
241 if (t
.tv_sec
!= time_now
)
247 // Time in milliseconds
248 time_now_ms
= (t
.tv_sec
* 1000) + (t
.tv_usec
/1000);
250 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
253 // work out a retry time based on try number
254 // This is a straight bounded exponential backoff.
255 // Maximum re-try time is 32 seconds. (2^5).
256 clockt
backoff(uint8_t try)
258 if (try > 5) try = 5; // max backoff
259 return now(NULL
) + 10 * (1 << try);
264 // Log a debug message. Typically called via the LOG macro
266 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
268 static char message
[65536] = {0};
274 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
275 ringbuffer
->tail
= 0;
276 if (ringbuffer
->tail
== ringbuffer
->head
)
277 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
278 ringbuffer
->head
= 0;
280 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
281 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
282 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
283 va_start(ap
, format
);
284 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
289 if (config
->debug
< level
) return;
291 va_start(ap
, format
);
292 vsnprintf(message
, sizeof(message
), format
, ap
);
295 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
297 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
302 void _log_hex(int level
, const char *title
, const uint8_t *data
, int maxsize
)
305 const uint8_t *d
= data
;
307 if (config
->debug
< level
) return;
309 // No support for _log_hex to syslog
312 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
313 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
315 for (i
= 0; i
< maxsize
; )
317 fprintf(log_stream
, "%4X: ", i
);
318 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
320 fprintf(log_stream
, "%02X ", d
[j
]);
322 fputs(": ", log_stream
);
325 for (; j
< i
+ 16; j
++)
327 fputs(" ", log_stream
);
329 fputs(": ", log_stream
);
332 fputs(" ", log_stream
);
333 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
335 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
336 fputc(d
[j
], log_stream
);
338 fputc('.', log_stream
);
341 fputs(" ", log_stream
);
345 fputs("\n", log_stream
);
349 setbuf(log_stream
, NULL
);
353 // update a counter, accumulating 2^32 wraps
354 void increment_counter(uint32_t *counter
, uint32_t *wrap
, uint32_t delta
)
356 uint32_t new = *counter
+ delta
;
363 // initialise the random generator
364 static void initrandom(char *source
)
366 static char path
[sizeof(config
->random_device
)] = "*undefined*";
368 // reinitialise only if we are forced to do so or if the config has changed
369 if (source
&& !strncmp(path
, source
, sizeof(path
)))
372 // close previous source, if any
381 snprintf(path
, sizeof(path
), "%s", source
);
385 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
387 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
388 path
, strerror(errno
));
393 // fill buffer with random data
394 void random_data(uint8_t *buf
, int len
)
401 n
= read(rand_fd
, buf
, len
);
402 if (n
>= len
) return;
407 LOG(0, 0, 0, "Error reading from random source: %s\n",
410 // fall back to rand()
418 // append missing data
420 // not using the low order bits from the prng stream
421 buf
[n
++] = (rand() >> 4) & 0xff;
426 // This adds it to the routing table, advertises it
427 // via BGP if enabled, and stuffs it into the
428 // 'sessionbyip' cache.
430 // 'ip' must be in _host_ order.
432 static void routeset(sessionidt s
, in_addr_t ip
, int prefixlen
, in_addr_t gw
, int add
)
442 if (!prefixlen
) prefixlen
= 32;
444 ip
&= 0xffffffff << (32 - prefixlen
);; // Force the ip to be the first one in the route.
446 memset(&req
, 0, sizeof(req
));
450 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
451 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
455 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
456 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
459 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
461 req
.rt
.rtm_family
= AF_INET
;
462 req
.rt
.rtm_dst_len
= prefixlen
;
463 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
464 req
.rt
.rtm_protocol
= 42;
465 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
466 req
.rt
.rtm_type
= RTN_UNICAST
;
468 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
470 netlink_addattr(&req
.nh
, RTA_DST
, &n_ip
, sizeof(n_ip
));
474 netlink_addattr(&req
.nh
, RTA_GATEWAY
, &n_ip
, sizeof(n_ip
));
477 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d%s%s\n", add
? "add" : "del",
478 fmtaddr(htonl(ip
), 0), prefixlen
,
479 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
481 if (netlink_send(&req
.nh
) < 0)
482 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno
));
486 bgp_add_route(htonl(ip
), prefixlen
);
488 bgp_del_route(htonl(ip
), prefixlen
);
491 // Add/Remove the IPs to the 'sessionbyip' cache.
492 // Note that we add the zero address in the case of
493 // a network route. Roll on CIDR.
495 // Note that 's == 0' implies this is the address pool.
496 // We still cache it here, because it will pre-fill
497 // the malloc'ed tree.
501 if (!add
) // Are we deleting a route?
502 s
= 0; // Caching the session as '0' is the same as uncaching.
504 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
509 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
517 char ipv6addr
[INET6_ADDRSTRLEN
];
519 if (!config
->ipv6_prefix
.s6_addr
[0])
521 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
525 memset(&req
, 0, sizeof(req
));
529 req
.nh
.nlmsg_type
= RTM_NEWROUTE
;
530 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
;
534 req
.nh
.nlmsg_type
= RTM_DELROUTE
;
535 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
;
538 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.rt
));
540 req
.rt
.rtm_family
= AF_INET6
;
541 req
.rt
.rtm_dst_len
= prefixlen
;
542 req
.rt
.rtm_table
= RT_TABLE_MAIN
;
543 req
.rt
.rtm_protocol
= 42;
544 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
545 req
.rt
.rtm_type
= RTN_UNICAST
;
547 netlink_addattr(&req
.nh
, RTA_OIF
, &tunidx
, sizeof(int));
548 netlink_addattr(&req
.nh
, RTA_DST
, &ip
, sizeof(ip
));
550 netlink_addattr(&req
.nh
, RTA_METRICS
, &metric
, sizeof(metric
));
552 LOG(1, s
, session
[s
].tunnel
, "Route %s %s/%d\n",
554 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
557 if (netlink_send(&req
.nh
) < 0)
558 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno
));
562 bgp_add_route6(ip
, prefixlen
);
564 bgp_del_route6(ip
, prefixlen
);
569 if (!add
) // Are we deleting a route?
570 s
= 0; // Caching the session as '0' is the same as uncaching.
572 cache_ipv6map(ip
, prefixlen
, s
);
579 // Set up netlink socket
580 static void initnetlink(void)
582 struct sockaddr_nl nladdr
;
584 nlfd
= socket(AF_NETLINK
, SOCK_RAW
, NETLINK_ROUTE
);
587 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno
));
591 memset(&nladdr
, 0, sizeof(nladdr
));
592 nladdr
.nl_family
= AF_NETLINK
;
593 nladdr
.nl_pid
= getpid();
595 if (bind(nlfd
, (struct sockaddr
*)&nladdr
, sizeof(nladdr
)) < 0)
597 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno
));
602 static ssize_t
netlink_send(struct nlmsghdr
*nh
)
604 struct sockaddr_nl nladdr
;
608 nh
->nlmsg_pid
= getpid();
609 nh
->nlmsg_seq
= ++nlseqnum
;
611 // set kernel address
612 memset(&nladdr
, 0, sizeof(nladdr
));
613 nladdr
.nl_family
= AF_NETLINK
;
615 iov
= (struct iovec
){ (void *)nh
, nh
->nlmsg_len
};
616 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
618 return sendmsg(nlfd
, &msg
, 0);
621 static ssize_t
netlink_recv(void *buf
, ssize_t len
)
623 struct sockaddr_nl nladdr
;
627 // set kernel address
628 memset(&nladdr
, 0, sizeof(nladdr
));
629 nladdr
.nl_family
= AF_NETLINK
;
631 iov
= (struct iovec
){ buf
, len
};
632 msg
= (struct msghdr
){ (void *)&nladdr
, sizeof(nladdr
), &iov
, 1, NULL
, 0, 0 };
634 return recvmsg(nlfd
, &msg
, 0);
637 /* adapted from iproute2 */
638 static void netlink_addattr(struct nlmsghdr
*nh
, int type
, const void *data
, int alen
)
640 int len
= RTA_LENGTH(alen
);
643 rta
= (struct rtattr
*)(((void *)nh
) + NLMSG_ALIGN(nh
->nlmsg_len
));
644 rta
->rta_type
= type
;
646 memcpy(RTA_DATA(rta
), data
, alen
);
647 nh
->nlmsg_len
= NLMSG_ALIGN(nh
->nlmsg_len
) + RTA_ALIGN(len
);
650 // messages corresponding to different phases seq number
651 static char *tun_nl_phase_msg
[] = {
653 "getting tun interface index",
654 "setting tun interface parameters",
655 "setting tun IPv4 address",
656 "setting tun LL IPv6 address",
657 "setting tun global IPv6 address",
661 // Set up TUN interface
662 static void inittun(void)
666 memset(&ifr
, 0, sizeof(ifr
));
667 ifr
.ifr_flags
= IFF_TUN
;
669 tunfd
= open(TUNDEVICE
, O_RDWR
);
672 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
676 int flags
= fcntl(tunfd
, F_GETFL
, 0);
677 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
679 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
681 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
684 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
) - 1);
685 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
));
687 tunidx
= if_nametoindex(config
->tundevice
);
690 LOG(0, 0, 0, "Can't get tun interface index\n");
699 struct ifinfomsg ifinfo
;
700 struct ifaddrmsg ifaddr
;
702 char rtdata
[32]; // 32 should be enough
704 uint32_t txqlen
, mtu
;
707 memset(&req
, 0, sizeof(req
));
709 req
.nh
.nlmsg_type
= RTM_NEWLINK
;
710 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_MULTI
;
711 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifinfo
));
713 req
.ifmsg
.ifinfo
.ifi_family
= AF_UNSPEC
;
714 req
.ifmsg
.ifinfo
.ifi_index
= tunidx
;
715 req
.ifmsg
.ifinfo
.ifi_flags
|= IFF_UP
; // set interface up
716 req
.ifmsg
.ifinfo
.ifi_change
= IFF_UP
; // only change this flag
718 /* Bump up the qlen to deal with bursts from the network */
720 netlink_addattr(&req
.nh
, IFLA_TXQLEN
, &txqlen
, sizeof(txqlen
));
721 /* set MTU to modem MRU */
723 netlink_addattr(&req
.nh
, IFLA_MTU
, &mtu
, sizeof(mtu
));
725 if (netlink_send(&req
.nh
) < 0)
728 memset(&req
, 0, sizeof(req
));
730 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
731 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
732 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
734 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET
;
735 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 32;
736 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
737 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
739 if (config
->bind_address
)
740 ip
= config
->bind_address
;
742 ip
= 0x01010101; // 1.1.1.1
743 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip
, sizeof(ip
));
745 if (netlink_send(&req
.nh
) < 0)
748 // Only setup IPv6 on the tun device if we have a configured prefix
749 if (config
->ipv6_prefix
.s6_addr
[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_INET6
;
759 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
760 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_LINK
;
761 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
763 // Link local address is FE80::1
764 memset(&ip6
, 0, sizeof(ip6
));
765 ip6
.s6_addr
[0] = 0xFE;
766 ip6
.s6_addr
[1] = 0x80;
768 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
770 if (netlink_send(&req
.nh
) < 0)
773 memset(&req
, 0, sizeof(req
));
775 req
.nh
.nlmsg_type
= RTM_NEWADDR
;
776 req
.nh
.nlmsg_flags
= NLM_F_REQUEST
| NLM_F_CREATE
| NLM_F_REPLACE
| NLM_F_MULTI
;
777 req
.nh
.nlmsg_len
= NLMSG_LENGTH(sizeof(req
.ifmsg
.ifaddr
));
779 req
.ifmsg
.ifaddr
.ifa_family
= AF_INET6
;
780 req
.ifmsg
.ifaddr
.ifa_prefixlen
= 64;
781 req
.ifmsg
.ifaddr
.ifa_scope
= RT_SCOPE_UNIVERSE
;
782 req
.ifmsg
.ifaddr
.ifa_index
= tunidx
;
784 // Global address is prefix::1
785 ip6
= config
->ipv6_prefix
;
787 netlink_addattr(&req
.nh
, IFA_LOCAL
, &ip6
, sizeof(ip6
));
789 if (netlink_send(&req
.nh
) < 0)
793 memset(&req
, 0, sizeof(req
));
795 req
.nh
.nlmsg_type
= NLMSG_DONE
;
796 req
.nh
.nlmsg_len
= NLMSG_LENGTH(0);
798 if (netlink_send(&req
.nh
) < 0)
801 // if we get an error for seqnum < min_initok_nlseqnum,
802 // we must exit as initialization went wrong
803 if (config
->ipv6_prefix
.s6_addr
[0])
804 min_initok_nlseqnum
= 5 + 1; // idx + if + addr + 2*addr6
806 min_initok_nlseqnum
= 3 + 1; // idx + if + addr
812 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno
));
817 static void initudp(void)
820 struct sockaddr_in addr
;
823 memset(&addr
, 0, sizeof(addr
));
824 addr
.sin_family
= AF_INET
;
825 addr
.sin_port
= htons(L2TPPORT
);
826 addr
.sin_addr
.s_addr
= config
->bind_address
;
827 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
828 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
830 int flags
= fcntl(udpfd
, F_GETFL
, 0);
831 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
833 if (bind(udpfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
835 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
840 memset(&addr
, 0, sizeof(addr
));
841 addr
.sin_family
= AF_INET
;
842 addr
.sin_port
= htons(NSCTL_PORT
);
843 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
844 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
845 setsockopt(controlfd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
846 if (bind(controlfd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
848 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
852 // Dynamic Authorization Extensions to RADIUS
853 memset(&addr
, 0, sizeof(addr
));
854 addr
.sin_family
= AF_INET
;
855 addr
.sin_port
= htons(config
->radius_dae_port
);
856 daefd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
857 setsockopt(daefd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
858 setsockopt(daefd
, SOL_IP
, IP_PKTINFO
, &on
, sizeof(on
)); // recvfromto
859 if (bind(daefd
, (struct sockaddr
*) &addr
, sizeof(addr
)) < 0)
861 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno
));
866 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
870 // Find session by IP, < 1 for not found
872 // Confusingly enough, this 'ip' must be
873 // in _network_ order. This being the common
874 // case when looking it up from IP packet headers.
876 // We actually use this cache for two things.
877 // #1. For used IP addresses, this maps to the
878 // session ID that it's used by.
879 // #2. For un-used IP addresses, this maps to the
880 // index into the pool table that contains that
884 static sessionidt
lookup_ipmap(in_addr_t ip
)
886 uint8_t *a
= (uint8_t *) &ip
;
887 union iphash
*h
= ip_hash
;
889 if (!(h
= h
[*a
++].idx
)) return 0;
890 if (!(h
= h
[*a
++].idx
)) return 0;
891 if (!(h
= h
[*a
++].idx
)) return 0;
896 static sessionidt
lookup_ipv6map(struct in6_addr ip
)
898 struct ipv6radix
*curnode
;
901 char ipv6addr
[INET6_ADDRSTRLEN
];
903 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
907 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
909 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
914 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
915 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
922 sessionidt
sessionbyip(in_addr_t ip
)
924 sessionidt s
= lookup_ipmap(ip
);
927 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
933 sessionidt
sessionbyipv6(struct in6_addr ip
)
936 CSTAT(sessionbyipv6
);
938 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
939 (ip
.s6_addr
[0] == 0xFE &&
940 ip
.s6_addr
[1] == 0x80 &&
941 ip
.s6_addr16
[1] == 0 &&
942 ip
.s6_addr16
[2] == 0 &&
943 ip
.s6_addr16
[3] == 0)) {
944 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
946 s
= lookup_ipv6map(ip
);
949 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
956 // Take an IP address in HOST byte order and
957 // add it to the sessionid by IP cache.
959 // (It's actually cached in network order)
961 static void cache_ipmap(in_addr_t ip
, sessionidt s
)
963 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
964 uint8_t *a
= (uint8_t *) &nip
;
965 union iphash
*h
= ip_hash
;
968 for (i
= 0; i
< 3; i
++)
970 if (!(h
[a
[i
]].idx
|| (h
[a
[i
]].idx
= calloc(256, sizeof(union iphash
)))))
979 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
982 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
983 // else a map to an ip pool index.
986 static void uncache_ipmap(in_addr_t ip
)
988 cache_ipmap(ip
, 0); // Assign it to the NULL session.
991 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, sessionidt s
)
995 struct ipv6radix
*curnode
;
996 char ipv6addr
[INET6_ADDRSTRLEN
];
998 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
1000 bytes
= prefixlen
>> 3;
1003 if (curnode
->branch
== NULL
)
1005 if (!(curnode
->branch
= calloc(256,
1006 sizeof (struct ipv6radix
))))
1009 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
1016 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
1017 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1021 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1022 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
1028 // CLI list to dump current ipcache.
1030 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
1032 union iphash
*d
= ip_hash
, *e
, *f
, *g
;
1036 if (CLI_HELP_REQUESTED
)
1037 return CLI_HELP_NO_ARGS
;
1039 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
1041 for (i
= 0; i
< 256; ++i
)
1047 for (j
= 0; j
< 256; ++j
)
1053 for (k
= 0; k
< 256; ++k
)
1059 for (l
= 0; l
< 256; ++l
)
1064 cli_print(cli
, "%7d %d.%d.%d.%d", g
[l
].sess
, i
, j
, k
, l
);
1070 cli_print(cli
, "%d entries in cache", count
);
1075 // Find session by username, 0 for not found
1076 // walled garden users aren't authenticated, so the username is
1077 // reasonably useless. Ignore them to avoid incorrect actions
1079 // This is VERY inefficent. Don't call it often. :)
1081 sessionidt
sessionbyuser(char *username
)
1084 CSTAT(sessionbyuser
);
1086 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1088 if (!session
[s
].opened
)
1091 if (session
[s
].walled_garden
)
1092 continue; // Skip walled garden users.
1094 if (!strncmp(session
[s
].user
, username
, 128))
1098 return 0; // Not found.
1101 void send_garp(in_addr_t ip
)
1107 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
1110 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
1113 memset(&ifr
, 0, sizeof(ifr
));
1114 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
1115 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
1117 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
1121 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
1122 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
1124 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
1129 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
1132 static sessiont
*sessiontbysessionidt(sessionidt s
)
1134 if (!s
|| s
>= MAXSESSION
) return NULL
;
1138 static sessionidt
sessionidtbysessiont(sessiont
*s
)
1140 sessionidt val
= s
-session
;
1141 if (s
< session
|| val
>= MAXSESSION
) return 0;
1145 // actually send a control message for a specific tunnel
1146 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
1148 struct sockaddr_in addr
;
1154 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
1155 STAT(tunnel_tx_errors
);
1161 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1162 STAT(tunnel_tx_errors
);
1166 memset(&addr
, 0, sizeof(addr
));
1167 addr
.sin_family
= AF_INET
;
1168 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
1169 addr
.sin_port
= htons(tunnel
[t
].port
);
1171 // sequence expected, if sequence in message
1172 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
1174 // If this is a control message, deal with retries
1177 tunnel
[t
].last
= time_now
; // control message sent
1178 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
1181 STAT(tunnel_retries
);
1182 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
1186 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
1188 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1189 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
1190 STAT(tunnel_tx_errors
);
1194 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
1195 STAT(tunnel_tx_packets
);
1196 INC_STAT(tunnel_tx_bytes
, l
);
1200 // Tiny helper function to write data to
1201 // the 'tun' device.
1203 int tun_write(uint8_t * data
, int size
)
1205 return write(tunfd
, data
, size
);
1208 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1209 void adjust_tcp_mss(sessionidt s
, tunnelidt t
, uint8_t *buf
, int len
, uint8_t *tcp
)
1211 int d
= (tcp
[12] >> 4) * 4;
1218 if ((tcp
[13] & 0x3f) & ~(TCP_FLAG_SYN
|TCP_FLAG_ACK
)) // only want SYN and SYN,ACK
1221 if (tcp
+ d
> buf
+ len
) // short?
1229 if (*opts
== 2 && opts
[1] == 4) // mss option (2), length 4
1232 if (mss
+ 2 > data
) return; // short?
1236 if (*opts
== 0) return; // end of options
1237 if (*opts
== 1 || !opts
[1]) // no op (one byte), or no length (prevent loop)
1240 opts
+= opts
[1]; // skip over option
1243 if (!mss
) return; // not found
1244 orig
= ntohs(*(uint16_t *) mss
);
1246 if (orig
<= MSS
) return; // mss OK
1248 LOG(5, s
, t
, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1249 fmtaddr(*(in_addr_t
*) (buf
+ 12), 0), ntohs(*(uint16_t *) tcp
),
1250 fmtaddr(*(in_addr_t
*) (buf
+ 16), 1), ntohs(*(uint16_t *) (tcp
+ 2)),
1251 (tcp
[13] & TCP_FLAG_ACK
) ? ",ACK" : "", orig
, MSS
);
1254 *(int16_t *) mss
= htons(MSS
);
1256 // adjust checksum (see rfc1141)
1257 sum
= orig
+ (~MSS
& 0xffff);
1258 sum
+= ntohs(*(uint16_t *) (tcp
+ 16));
1259 sum
= (sum
& 0xffff) + (sum
>> 16);
1260 *(uint16_t *) (tcp
+ 16) = htons(sum
+ (sum
>> 16));
1263 void processmpframe(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint8_t extra
)
1267 // Skip the four extra bytes
1279 proto
= ntohs(*(uint16_t *) p
);
1287 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1288 return; // closing session, PPP not processed
1290 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1291 processipin(s
, t
, p
, l
);
1293 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
1297 LOG(4, s
, t
, "MPPP: Session %d is closing. Don't process PPP packets\n", s
);
1298 return; // closing session, PPP not processed
1301 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1302 processipv6in(s
, t
, p
, l
);
1304 else if (proto
== PPPIPCP
)
1306 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1307 processipcp(s
, t
, p
, l
);
1309 else if (proto
== PPPCCP
)
1311 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
1312 processccp(s
, t
, p
, l
);
1316 LOG(2, s
, t
, "MPPP: Unsupported MP protocol 0x%04X received\n",proto
);
1320 static void update_session_out_stat(sessionidt s
, sessiont
*sp
, int len
)
1322 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1323 sp
->cout_delta
+= len
;
1325 sp
->last_data
= time_now
;
1327 sess_local
[s
].cout
+= len
; // To send to master..
1328 sess_local
[s
].pout
++;
1331 // process outgoing (to tunnel) IP
1333 // (i.e. this routine writes to data[-8]).
1334 void processipout(uint8_t *buf
, int len
)
1341 uint8_t *data
= buf
; // Keep a copy of the originals.
1344 uint8_t fragbuf
[MAXETHER
+ 20];
1346 CSTAT(processipout
);
1348 if (len
< MIN_IP_SIZE
)
1350 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
1351 STAT(tun_rx_errors
);
1354 if (len
>= MAXETHER
)
1356 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
1357 STAT(tun_rx_errors
);
1361 // Skip the tun header
1365 // Got an IP header now
1366 if (*(uint8_t *)(buf
) >> 4 != 4)
1368 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1372 ip
= *(uint32_t *)(buf
+ 16);
1373 if (!(s
= sessionbyip(ip
)))
1375 // Is this a packet for a session that doesn't exist?
1376 static int rate
= 0; // Number of ICMP packets we've sent this second.
1377 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1379 if (last
!= time_now
)
1385 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1387 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1388 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4),
1389 config
->bind_address
? config
->bind_address
: my_address
, buf
, len
);
1394 t
= session
[s
].tunnel
;
1395 if (len
> session
[s
].mru
|| (session
[s
].mrru
&& len
> session
[s
].mrru
))
1397 LOG(3, s
, t
, "Packet size more than session MRU\n");
1403 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1404 if (config
->max_packets
> 0)
1406 if (sess_local
[s
].last_packet_out
== TIME
)
1408 int max
= config
->max_packets
;
1410 // All packets for throttled sessions are handled by the
1411 // master, so further limit by using the throttle rate.
1412 // A bit of a kludge, since throttle rate is in kbps,
1413 // but should still be generous given our average DSL
1414 // packet size is 200 bytes: a limit of 28kbps equates
1415 // to around 180 packets per second.
1416 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1417 max
= sp
->throttle_out
;
1419 if (++sess_local
[s
].packets_out
> max
)
1421 sess_local
[s
].packets_dropped
++;
1427 if (sess_local
[s
].packets_dropped
)
1429 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1430 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1431 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1432 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1436 sess_local
[s
].last_packet_out
= TIME
;
1437 sess_local
[s
].packets_out
= 1;
1438 sess_local
[s
].packets_dropped
= 0;
1442 // run access-list if any
1443 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1446 // adjust MSS on SYN and SYN,ACK packets with options
1447 if ((ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff) == 0 && buf
[9] == IPPROTO_TCP
) // first tcp fragment
1449 int ihl
= (buf
[0] & 0xf) * 4; // length of IP header
1450 if (len
>= ihl
+ 20 && (buf
[ihl
+ 13] & TCP_FLAG_SYN
) && ((buf
[ihl
+ 12] >> 4) > 5))
1451 adjust_tcp_mss(s
, t
, buf
, len
, buf
+ ihl
);
1456 // Are we throttling this session?
1457 if (config
->cluster_iam_master
)
1458 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1460 master_throttle_packet(sp
->tbf_out
, data
, size
);
1464 if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1466 // We are walled-gardening this
1467 master_garden_packet(s
, data
, size
);
1471 if(session
[s
].bundle
!= 0 && bundle
[session
[s
].bundle
].num_of_links
> 1)
1474 if (!config
->cluster_iam_master
)
1476 // The MPPP packets must be managed by the Master.
1477 master_forward_mppp_packet(s
, data
, size
);
1481 // Add on L2TP header
1482 sessionidt members
[MAXBUNDLESES
];
1483 bundleidt bid
= session
[s
].bundle
;
1484 bundlet
*b
= &bundle
[bid
];
1485 uint32_t num_of_links
, nb_opened
;
1488 num_of_links
= b
->num_of_links
;
1490 for (i
= 0;i
< num_of_links
;i
++)
1493 if (session
[s
].ppp
.lcp
== Opened
)
1495 members
[nb_opened
] = s
;
1502 LOG(3, s
, t
, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid
);
1506 num_of_links
= nb_opened
;
1507 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1508 s
= members
[b
->current_ses
];
1509 t
= session
[s
].tunnel
;
1511 LOG(4, s
, t
, "MPPP: (1)Session number becomes: %d\n", s
);
1513 if (num_of_links
> 1)
1515 if(len
> MINFRAGLEN
)
1517 //for rotate traffic among the member links
1518 uint32_t divisor
= num_of_links
;
1520 divisor
= divisor
/2 + (divisor
& 1);
1522 // Partition the packet to "num_of_links" fragments
1523 uint32_t fraglen
= len
/ divisor
;
1524 uint32_t last_fraglen
= fraglen
+ len
% divisor
;
1525 uint32_t remain
= len
;
1527 // send the first packet
1528 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, fraglen
, s
, t
, PPPIP
, 0, bid
, MP_BEGIN
);
1530 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1533 update_session_out_stat(s
, sp
, fraglen
);
1536 while (remain
> last_fraglen
)
1538 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1539 s
= members
[b
->current_ses
];
1540 t
= session
[s
].tunnel
;
1542 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1543 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), fraglen
, s
, t
, PPPIP
, 0, bid
, 0);
1545 tunnelsend(fragbuf
, fraglen
+ (p
-fragbuf
), t
); // send it...
1546 update_session_out_stat(s
, sp
, fraglen
);
1549 // send the last fragment
1550 b
->current_ses
= (b
->current_ses
+ 1) % num_of_links
;
1551 s
= members
[b
->current_ses
];
1552 t
= session
[s
].tunnel
;
1554 LOG(4, s
, t
, "MPPP: (2)Session number becomes: %d\n", s
);
1555 p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
+(len
- remain
), remain
, s
, t
, PPPIP
, 0, bid
, MP_END
);
1557 tunnelsend(fragbuf
, remain
+ (p
-fragbuf
), t
); // send it...
1558 update_session_out_stat(s
, sp
, remain
);
1559 if (remain
!= last_fraglen
)
1560 LOG(3, s
, t
, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain
, last_fraglen
);
1564 // Send it as one frame
1565 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, bid
, MP_BOTH_BITS
);
1567 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1568 LOG(4, s
, t
, "MPPP: packet sent as one frame\n");
1569 update_session_out_stat(s
, sp
, len
);
1574 // Send it as one frame (NO MPPP Frame)
1575 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1577 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1578 update_session_out_stat(s
, sp
, len
);
1583 uint8_t *p
= makeppp(fragbuf
, sizeof(fragbuf
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1585 tunnelsend(fragbuf
, len
+ (p
-fragbuf
), t
); // send it...
1586 update_session_out_stat(s
, sp
, len
);
1589 // Snooping this session, send it to intercept box
1590 if (sp
->snoop_ip
&& sp
->snoop_port
)
1591 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1596 // process outgoing (to tunnel) IPv6
1598 static void processipv6out(uint8_t * buf
, int len
)
1604 struct in6_addr ip6
;
1606 uint8_t *data
= buf
; // Keep a copy of the originals.
1609 uint8_t b
[MAXETHER
+ 20];
1611 CSTAT(processipv6out
);
1613 if (len
< MIN_IP_SIZE
)
1615 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1616 STAT(tunnel_tx_errors
);
1619 if (len
>= MAXETHER
)
1621 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1622 STAT(tunnel_tx_errors
);
1626 // Skip the tun header
1630 // Got an IP header now
1631 if (*(uint8_t *)(buf
) >> 4 != 6)
1633 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1637 ip6
= *(struct in6_addr
*)(buf
+24);
1638 s
= sessionbyipv6(ip6
);
1642 ip
= *(uint32_t *)(buf
+ 32);
1643 s
= sessionbyip(ip
);
1648 // Is this a packet for a session that doesn't exist?
1649 static int rate
= 0; // Number of ICMP packets we've sent this second.
1650 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1652 if (last
!= time_now
)
1658 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1660 // FIXME: Should send icmp6 host unreachable
1664 if (session
[s
].bundle
&& bundle
[session
[s
].bundle
].num_of_links
> 1)
1666 bundleidt bid
= session
[s
].bundle
;
1667 bundlet
*b
= &bundle
[bid
];
1669 b
->current_ses
= (b
->current_ses
+ 1) % b
->num_of_links
;
1670 s
= b
->members
[b
->current_ses
];
1671 LOG(3, s
, session
[s
].tunnel
, "MPPP: Session number becomes: %u\n", s
);
1673 t
= session
[s
].tunnel
;
1675 sp
->last_data
= time_now
;
1677 // FIXME: add DoS prevention/filters?
1681 // Are we throttling this session?
1682 if (config
->cluster_iam_master
)
1683 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1685 master_throttle_packet(sp
->tbf_out
, data
, size
);
1688 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1690 // We are walled-gardening this
1691 master_garden_packet(s
, data
, size
);
1695 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1697 // Add on L2TP header
1699 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIPV6
, 0, 0, 0);
1701 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1704 // Snooping this session, send it to intercept box
1705 if (sp
->snoop_ip
&& sp
->snoop_port
)
1706 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1708 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1709 sp
->cout_delta
+= len
;
1713 sess_local
[s
].cout
+= len
; // To send to master..
1714 sess_local
[s
].pout
++;
1718 // Helper routine for the TBF filters.
1719 // Used to send queued data in to the user!
1721 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1726 uint8_t b
[MAXETHER
+ 20];
1728 if (len
< 0 || len
> MAXETHER
)
1730 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1734 // Skip the tun header
1741 t
= session
[s
].tunnel
;
1744 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1746 // Add on L2TP header
1748 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, s
, t
, PPPIP
, 0, 0, 0);
1750 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1753 // Snooping this session.
1754 if (sp
->snoop_ip
&& sp
->snoop_port
)
1755 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1757 increment_counter(&sp
->cout
, &sp
->cout_wrap
, len
); // byte count
1758 sp
->cout_delta
+= len
;
1762 sess_local
[s
].cout
+= len
; // To send to master..
1763 sess_local
[s
].pout
++;
1766 // add an AVP (16 bit)
1767 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1769 uint16_t l
= (m
? 0x8008 : 0x0008);
1770 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1771 c
->buf16
[c
->length
/2 + 1] = htons(0);
1772 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1773 c
->buf16
[c
->length
/2 + 3] = htons(val
);
1777 // add an AVP (32 bit)
1778 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1780 uint16_t l
= (m
? 0x800A : 0x000A);
1781 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1782 c
->buf16
[c
->length
/2 + 1] = htons(0);
1783 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1784 *(uint32_t *) &c
->buf
[c
->length
+ 6] = htonl(val
);
1788 // add an AVP (string)
1789 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1791 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1792 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1793 c
->buf16
[c
->length
/2 + 1] = htons(0);
1794 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1795 memcpy(&c
->buf
[c
->length
+ 6], val
, strlen(val
));
1796 c
->length
+= 6 + strlen(val
);
1800 static void controlb(controlt
* c
, uint16_t avp
, uint8_t *val
, unsigned int len
, uint8_t m
)
1802 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1803 c
->buf16
[c
->length
/2 + 0] = htons(l
);
1804 c
->buf16
[c
->length
/2 + 1] = htons(0);
1805 c
->buf16
[c
->length
/2 + 2] = htons(avp
);
1806 memcpy(&c
->buf
[c
->length
+ 6], val
, len
);
1807 c
->length
+= 6 + len
;
1810 // new control connection
1811 static controlt
*controlnew(uint16_t mtype
)
1815 c
= malloc(sizeof(controlt
));
1819 controlfree
= c
->next
;
1823 c
->buf16
[0] = htons(0xC802); // flags/ver
1825 control16(c
, 0, mtype
, 1);
1829 // send zero block if nothing is waiting
1831 static void controlnull(tunnelidt t
)
1834 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1837 buf
[0] = htons(0xC802); // flags/ver
1838 buf
[1] = htons(12); // length
1839 buf
[2] = htons(tunnel
[t
].far
); // tunnel
1840 buf
[3] = htons(0); // session
1841 buf
[4] = htons(tunnel
[t
].ns
); // sequence
1842 buf
[5] = htons(tunnel
[t
].nr
); // sequence
1843 tunnelsend((uint8_t *)buf
, 12, t
);
1846 // add a control message to a tunnel, and send if within window
1847 static void controladd(controlt
*c
, sessionidt far
, tunnelidt t
)
1849 c
->buf16
[1] = htons(c
->length
); // length
1850 c
->buf16
[2] = htons(tunnel
[t
].far
); // tunnel
1851 c
->buf16
[3] = htons(far
); // session
1852 c
->buf16
[4] = htons(tunnel
[t
].ns
); // sequence
1853 tunnel
[t
].ns
++; // advance sequence
1854 // link in message in to queue
1855 if (tunnel
[t
].controlc
)
1856 tunnel
[t
].controle
->next
= c
;
1858 tunnel
[t
].controls
= c
;
1860 tunnel
[t
].controle
= c
;
1861 tunnel
[t
].controlc
++;
1863 // send now if space in window
1864 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1866 tunnel
[t
].try = 0; // first send
1867 tunnelsend(c
->buf
, c
->length
, t
);
1872 // Throttle or Unthrottle a session
1874 // Throttle the data from/to through a session to no more than
1875 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1878 // If either value is -1, the current value is retained for that
1881 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1883 if (!session
[s
].opened
)
1884 return; // No-one home.
1886 if (!*session
[s
].user
)
1887 return; // User not logged in
1891 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1892 if (session
[s
].tbf_in
)
1893 free_tbf(session
[s
].tbf_in
);
1896 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1898 session
[s
].tbf_in
= 0;
1900 session
[s
].throttle_in
= rate_in
;
1905 int bytes
= rate_out
* 1024 / 8;
1906 if (session
[s
].tbf_out
)
1907 free_tbf(session
[s
].tbf_out
);
1910 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1912 session
[s
].tbf_out
= 0;
1914 session
[s
].throttle_out
= rate_out
;
1918 // add/remove filters from session (-1 = no change)
1919 void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1921 if (!session
[s
].opened
)
1922 return; // No-one home.
1924 if (!*session
[s
].user
)
1925 return; // User not logged in
1928 if (filter_in
> MAXFILTER
) filter_in
= -1;
1929 if (filter_out
> MAXFILTER
) filter_out
= -1;
1930 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1931 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1935 if (session
[s
].filter_in
)
1936 ip_filters
[session
[s
].filter_in
- 1].used
--;
1939 ip_filters
[filter_in
- 1].used
++;
1941 session
[s
].filter_in
= filter_in
;
1944 if (filter_out
>= 0)
1946 if (session
[s
].filter_out
)
1947 ip_filters
[session
[s
].filter_out
- 1].used
--;
1950 ip_filters
[filter_out
- 1].used
++;
1952 session
[s
].filter_out
= filter_out
;
1956 // start tidy shutdown of session
1957 void sessionshutdown(sessionidt s
, char const *reason
, int cdn_result
, int cdn_error
, int term_cause
)
1959 int walled_garden
= session
[s
].walled_garden
;
1960 bundleidt b
= session
[s
].bundle
;
1961 //delete routes only for last session in bundle (in case of MPPP)
1962 int del_routes
= !b
|| (bundle
[b
].num_of_links
== 1);
1964 CSTAT(sessionshutdown
);
1966 if (!session
[s
].opened
)
1968 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1969 return; // not a live session
1972 if (!session
[s
].die
)
1974 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1975 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %u: %s\n", s
, reason
);
1976 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1977 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1980 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1982 // RADIUS Stop message
1983 uint16_t r
= radiusnew(s
);
1986 // stop, if not already trying
1987 if (radius
[r
].state
!= RADIUSSTOP
)
1989 radius
[r
].term_cause
= term_cause
;
1990 radius
[r
].term_msg
= reason
;
1991 radiussend(r
, RADIUSSTOP
);
1995 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1997 // Save counters to dump to accounting file
1998 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1999 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
2003 { // IP allocated, clear and unroute
2006 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
2008 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
2009 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
2012 if (del_routes
) routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 0);
2013 session
[s
].route
[r
].ip
= 0;
2016 if (session
[s
].ip_pool_index
== -1) // static ip
2018 if (!routed
&& del_routes
) routeset(s
, session
[s
].ip
, 0, 0, 0);
2024 // unroute IPv6, if setup
2025 if (session
[s
].ppp
.ipv6cp
== Opened
&& session
[s
].ipv6prefixlen
&& del_routes
)
2026 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
2030 // This session was part of a bundle
2031 bundle
[b
].num_of_links
--;
2032 LOG(3, s
, session
[s
].tunnel
, "MPPP: Dropping member link: %d from bundle %d\n",s
,b
);
2033 if(bundle
[b
].num_of_links
== 0)
2036 LOG(3, s
, session
[s
].tunnel
, "MPPP: Kill bundle: %d (No remaing member links)\n",b
);
2040 // Adjust the members array to accomodate the new change
2041 uint8_t mem_num
= 0;
2042 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2043 if(bundle
[b
].members
[bundle
[b
].num_of_links
] != s
)
2046 for(ml
= 0; ml
<bundle
[b
].num_of_links
; ml
++)
2047 if(bundle
[b
].members
[ml
] == s
)
2052 bundle
[b
].members
[mem_num
] = bundle
[b
].members
[bundle
[b
].num_of_links
];
2053 LOG(3, s
, session
[s
].tunnel
, "MPPP: Adjusted member links array\n");
2055 // If the killed session is the first of the bundle,
2056 // the new first session must be stored in the cache_ipmap
2057 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2060 sessionidt new_s
= bundle
[b
].members
[0];
2063 // Add the route for this session.
2064 for (r
= 0; r
< MAXROUTE
&& session
[new_s
].route
[r
].ip
; r
++)
2069 prefixlen
= session
[new_s
].route
[r
].prefixlen
;
2070 ip
= session
[new_s
].route
[r
].ip
;
2072 if (!prefixlen
) prefixlen
= 32;
2073 ip
&= 0xffffffff << (32 - prefixlen
); // Force the ip to be the first one in the route.
2075 for (i
= ip
; i
< ip
+(1<<(32-prefixlen
)) ; ++i
)
2076 cache_ipmap(i
, new_s
);
2078 cache_ipmap(session
[new_s
].ip
, new_s
);
2081 if (session
[new_s
].ipv6prefixlen
)
2082 cache_ipv6map(session
[new_s
].ipv6route
, session
[new_s
].ipv6prefixlen
, new_s
);
2087 cluster_send_bundle(b
);
2091 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
2092 throttle_session(s
, 0, 0);
2096 controlt
*c
= controlnew(14); // sending CDN
2100 buf
[0] = htons(cdn_result
);
2101 buf
[1] = htons(cdn_error
);
2102 controlb(c
, 1, (uint8_t *)buf
, 4, 1);
2105 control16(c
, 1, cdn_result
, 1);
2107 control16(c
, 14, s
, 1); // assigned session (our end)
2108 controladd(c
, session
[s
].far
, session
[s
].tunnel
); // send the message
2111 // update filter refcounts
2112 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
2113 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
2116 memset(&session
[s
].ppp
, 0, sizeof(session
[s
].ppp
));
2117 sess_local
[s
].lcp
.restart
= 0;
2118 sess_local
[s
].ipcp
.restart
= 0;
2119 sess_local
[s
].ipv6cp
.restart
= 0;
2120 sess_local
[s
].ccp
.restart
= 0;
2122 cluster_send_session(s
);
2125 void sendipcp(sessionidt s
, tunnelidt t
)
2127 uint8_t buf
[MAXETHER
];
2131 LOG(3, s
, t
, "IPCP: send ConfigReq\n");
2133 if (!session
[s
].unique_id
)
2135 if (!++last_id
) ++last_id
; // skip zero
2136 session
[s
].unique_id
= last_id
;
2139 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPCP
, 0, 0, 0);
2143 q
[1] = session
[s
].unique_id
& 0xf; // ID, dont care, we only send one type of request
2144 *(uint16_t *) (q
+ 2) = htons(10); // packet length
2145 q
[4] = 3; // ip address option
2146 q
[5] = 6; // option length
2147 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
2148 config
->bind_address
? config
->bind_address
:
2149 my_address
; // send my IP
2151 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
2152 restart_timer(s
, ipcp
);
2155 void sendipv6cp(sessionidt s
, tunnelidt t
)
2157 uint8_t buf
[MAXETHER
];
2161 LOG(3, s
, t
, "IPV6CP: send ConfigReq\n");
2163 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPIPV6CP
, 0, 0, 0);
2167 q
[1] = session
[s
].unique_id
& 0xf; // ID, don't care, we
2168 // only send one type
2170 *(uint16_t *) (q
+ 2) = htons(14);
2171 q
[4] = 1; // interface identifier option
2172 q
[5] = 10; // option length
2173 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
2174 *(uint32_t *) (q
+ 10) = 0;
2177 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
2178 restart_timer(s
, ipv6cp
);
2181 static void sessionclear(sessionidt s
)
2183 memset(&session
[s
], 0, sizeof(session
[s
]));
2184 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
2185 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
2187 session
[s
].tunnel
= T_FREE
; // Mark it as free.
2188 session
[s
].next
= sessionfree
;
2192 // kill a session now
2193 void sessionkill(sessionidt s
, char *reason
)
2197 if (!session
[s
].opened
) // not alive
2200 if (session
[s
].next
)
2202 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%u)\n", session
[s
].next
);
2206 if (!session
[s
].die
)
2207 sessionshutdown(s
, reason
, CDN_ADMIN_DISC
, TERM_ADMIN_RESET
); // close radius/routes, etc.
2209 if (sess_local
[s
].radius
)
2210 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
2212 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
2214 cluster_send_session(s
);
2217 static void tunnelclear(tunnelidt t
)
2220 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
2221 tunnel
[t
].state
= TUNNELFREE
;
2224 static void bundleclear(bundleidt b
)
2227 memset(&bundle
[b
], 0, sizeof(bundle
[b
]));
2228 bundle
[b
].state
= BUNDLEFREE
;
2231 // kill a tunnel now
2232 static void tunnelkill(tunnelidt t
, char *reason
)
2239 tunnel
[t
].state
= TUNNELDIE
;
2241 // free control messages
2242 while ((c
= tunnel
[t
].controls
))
2244 controlt
* n
= c
->next
;
2245 tunnel
[t
].controls
= n
;
2246 tunnel
[t
].controlc
--;
2247 c
->next
= controlfree
;
2251 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2252 if (session
[s
].tunnel
== t
)
2253 sessionkill(s
, reason
);
2257 LOG(1, 0, t
, "Kill tunnel %u: %s\n", t
, reason
);
2258 cli_tunnel_actions
[t
].action
= 0;
2259 cluster_send_tunnel(t
);
2262 // shut down a tunnel cleanly
2263 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
2267 CSTAT(tunnelshutdown
);
2269 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
2271 // never set up, can immediately kill
2272 tunnelkill(t
, reason
);
2275 LOG(1, 0, t
, "Shutting down tunnel %u (%s)\n", t
, reason
);
2278 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
2279 if (session
[s
].tunnel
== t
)
2280 sessionshutdown(s
, reason
, CDN_NONE
, TERM_ADMIN_RESET
);
2282 tunnel
[t
].state
= TUNNELDIE
;
2283 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
2284 cluster_send_tunnel(t
);
2285 // TBA - should we wait for sessions to stop?
2288 controlt
*c
= controlnew(4); // sending StopCCN
2293 buf
[0] = htons(result
);
2294 buf
[1] = htons(error
);
2297 int m
= strlen(msg
);
2298 if (m
+ 4 > sizeof(buf
))
2299 m
= sizeof(buf
) - 4;
2301 memcpy(buf
+2, msg
, m
);
2305 controlb(c
, 1, (uint8_t *)buf
, l
, 1);
2308 control16(c
, 1, result
, 1);
2310 control16(c
, 9, t
, 1); // assigned tunnel (our end)
2311 controladd(c
, 0, t
); // send the message
2315 // read and process packet on tunnel (UDP)
2316 void processudp(uint8_t *buf
, int len
, struct sockaddr_in
*addr
)
2318 uint8_t *chapresponse
= NULL
;
2319 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
2320 uint8_t *p
= buf
+ 2;
2327 LOG_HEX(5, "UDP Data", buf
, len
);
2328 STAT(tunnel_rx_packets
);
2329 INC_STAT(tunnel_rx_bytes
, len
);
2332 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
2333 STAT(tunnel_rx_errors
);
2336 if ((buf
[1] & 0x0F) != 2)
2338 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf
[1] & 0x0F);
2339 STAT(tunnel_rx_errors
);
2344 l
= ntohs(*(uint16_t *) p
);
2347 t
= ntohs(*(uint16_t *) p
);
2349 s
= ntohs(*(uint16_t *) p
);
2351 if (s
>= MAXSESSION
)
2353 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
2354 STAT(tunnel_rx_errors
);
2359 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
2360 STAT(tunnel_rx_errors
);
2365 ns
= ntohs(*(uint16_t *) p
);
2367 nr
= ntohs(*(uint16_t *) p
);
2372 uint16_t o
= ntohs(*(uint16_t *) p
);
2377 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
2378 STAT(tunnel_rx_errors
);
2383 // used to time out old tunnels
2384 if (t
&& tunnel
[t
].state
== TUNNELOPEN
)
2385 tunnel
[t
].lastrec
= time_now
;
2389 uint16_t message
= 0xFFFF; // message type
2391 uint8_t mandatory
= 0;
2392 uint16_t asession
= 0; // assigned session
2393 uint32_t amagic
= 0; // magic number
2394 uint8_t aflags
= 0; // flags from last LCF
2395 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2396 char called
[MAXTEL
] = ""; // called number
2397 char calling
[MAXTEL
] = ""; // calling number
2399 if (!config
->cluster_iam_master
)
2401 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2405 // control messages must have bits 0x80|0x40|0x08
2406 // (type, length and sequence) set, and bits 0x02|0x01
2407 // (offset and priority) clear
2408 if ((*buf
& 0xCB) != 0xC8)
2410 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
2411 STAT(tunnel_rx_errors
);
2415 // check for duplicate tunnel open message
2421 // Is this a duplicate of the first packet? (SCCRQ)
2423 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
2425 if (tunnel
[i
].state
!= TUNNELOPENING
||
2426 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
2427 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
2430 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
2435 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2436 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
2438 // if no tunnel specified, assign one
2441 if (!(t
= new_tunnel()))
2443 LOG(1, 0, 0, "No more tunnels\n");
2444 STAT(tunnel_overflow
);
2448 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
2449 tunnel
[t
].port
= ntohs(addr
->sin_port
);
2450 tunnel
[t
].window
= 4; // default window
2451 STAT(tunnel_created
);
2452 LOG(1, 0, t
, " New tunnel from %s:%u ID %u\n",
2453 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
2456 // If the 'ns' just received is not the 'nr' we're
2457 // expecting, just send an ack and drop it.
2459 // if 'ns' is less, then we got a retransmitted packet.
2460 // if 'ns' is greater than missed a packet. Either way
2461 // we should ignore it.
2462 if (ns
!= tunnel
[t
].nr
)
2464 // is this the sequence we were expecting?
2465 STAT(tunnel_rx_errors
);
2466 LOG(1, 0, t
, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2467 t
, ns
, tunnel
[t
].nr
);
2469 if (l
) // Is this not a ZLB?
2474 // check sequence of this message
2476 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
2477 // some to clear maybe?
2478 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
2480 controlt
*c
= tunnel
[t
].controls
;
2481 tunnel
[t
].controls
= c
->next
;
2482 tunnel
[t
].controlc
--;
2483 c
->next
= controlfree
;
2486 tunnel
[t
].try = 0; // we have progress
2489 // receiver advance (do here so quoted correctly in any sends below)
2490 if (l
) tunnel
[t
].nr
= (ns
+ 1);
2491 if (skip
< 0) skip
= 0;
2492 if (skip
< tunnel
[t
].controlc
)
2494 // some control packets can now be sent that were previous stuck out of window
2495 int tosend
= tunnel
[t
].window
- skip
;
2496 controlt
*c
= tunnel
[t
].controls
;
2504 tunnel
[t
].try = 0; // first send
2505 tunnelsend(c
->buf
, c
->length
, t
);
2510 if (!tunnel
[t
].controlc
)
2511 tunnel
[t
].retry
= 0; // caught up
2514 { // if not a null message
2519 // Default disconnect cause/message on receipt of CDN. Set to
2520 // more specific value from attribute 1 (result code) or 46
2521 // (disconnect cause) if present below.
2522 int disc_cause_set
= 0;
2523 int disc_cause
= TERM_NAS_REQUEST
;
2524 char const *disc_reason
= "Closed (Received CDN).";
2527 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
2529 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
2536 LOG(1, s
, t
, "Invalid length in AVP\n");
2537 STAT(tunnel_rx_errors
);
2542 if (flags
& 0x3C) // reserved bits, should be clear
2544 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
2546 result
= 2; // general error
2547 error
= 3; // reserved field non-zero
2552 if (*(uint16_t *) (b
))
2554 LOG(2, s
, t
, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b
)));
2556 result
= 2; // general error
2557 error
= 6; // generic vendor-specific error
2558 msg
= "unsupported vendor-specific";
2562 mtype
= ntohs(*(uint16_t *) (b
));
2570 // handle hidden AVPs
2571 if (!*config
->l2tp_secret
)
2573 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
2575 result
= 2; // general error
2576 error
= 6; // generic vendor-specific error
2577 msg
= "secret not specified";
2580 if (!session
[s
].random_vector_length
)
2582 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
2584 result
= 2; // general error
2585 error
= 6; // generic
2586 msg
= "no random vector";
2591 LOG(2, s
, t
, "Short hidden AVP.\n");
2593 result
= 2; // general error
2594 error
= 2; // length is wrong
2600 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2602 orig_len
= ntohs(*(uint16_t *) b
);
2603 if (orig_len
> n
+ 2)
2605 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2609 result
= 2; // general error
2610 error
= 2; // length is wrong
2619 LOG(4, s
, t
, " AVP %u (%s) len %d%s%s\n", mtype
, l2tp_avp_name(mtype
), n
,
2620 flags
& 0x40 ? ", hidden" : "", flags
& 0x80 ? ", mandatory" : "");
2624 case 0: // message type
2625 message
= ntohs(*(uint16_t *) b
);
2626 mandatory
= flags
& 0x80;
2627 LOG(4, s
, t
, " Message type = %u (%s)\n", message
, l2tp_code(message
));
2629 case 1: // result code
2631 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2632 char const *resdesc
= "(unknown)";
2633 char const *errdesc
= NULL
;
2638 resdesc
= l2tp_stopccn_result_code(rescode
);
2639 cause
= TERM_LOST_SERVICE
;
2641 else if (message
== 14)
2643 resdesc
= l2tp_cdn_result_code(rescode
);
2645 cause
= TERM_LOST_CARRIER
;
2647 cause
= TERM_ADMIN_RESET
;
2650 LOG(4, s
, t
, " Result Code %u: %s\n", rescode
, resdesc
);
2653 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2654 errdesc
= l2tp_error_code(errcode
);
2655 LOG(4, s
, t
, " Error Code %u: %s\n", errcode
, errdesc
);
2658 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2660 if (cause
&& disc_cause_set
< mtype
) // take cause from attrib 46 in preference
2662 disc_cause_set
= mtype
;
2663 disc_reason
= errdesc
? errdesc
: resdesc
;
2670 case 2: // protocol version
2672 version
= ntohs(*(uint16_t *) (b
));
2673 LOG(4, s
, t
, " Protocol version = %u\n", version
);
2674 if (version
&& version
!= 0x0100)
2675 { // allow 0.0 and 1.0
2676 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2678 result
= 5; // unspported protocol version
2679 error
= 0x0100; // supported version
2685 case 3: // framing capabilities
2687 case 4: // bearer capabilities
2689 case 5: // tie breaker
2690 // We never open tunnels, so we don't care about tie breakers
2692 case 6: // firmware revision
2694 case 7: // host name
2695 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2696 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2697 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2698 // TBA - to send to RADIUS
2700 case 8: // vendor name
2701 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2702 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2703 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2705 case 9: // assigned tunnel
2706 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2707 LOG(4, s
, t
, " Remote tunnel id = %u\n", tunnel
[t
].far
);
2709 case 10: // rx window
2710 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2711 if (!tunnel
[t
].window
)
2712 tunnel
[t
].window
= 1; // window of 0 is silly
2713 LOG(4, s
, t
, " rx window = %u\n", tunnel
[t
].window
);
2715 case 11: // Challenge
2717 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2718 build_chap_response(b
, 2, n
, &chapresponse
);
2721 case 13: // Response
2722 // Why did they send a response? We never challenge.
2723 LOG(2, s
, t
, " received unexpected challenge response\n");
2726 case 14: // assigned session
2727 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2728 LOG(4, s
, t
, " assigned session = %u\n", asession
);
2730 case 15: // call serial number
2731 LOG(4, s
, t
, " call serial number = %u\n", ntohl(*(uint32_t *)b
));
2733 case 18: // bearer type
2734 LOG(4, s
, t
, " bearer type = %u\n", ntohl(*(uint32_t *)b
));
2737 case 19: // framing type
2738 LOG(4, s
, t
, " framing type = %u\n", ntohl(*(uint32_t *)b
));
2741 case 21: // called number
2742 memset(called
, 0, sizeof(called
));
2743 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2744 LOG(4, s
, t
, " Called <%s>\n", called
);
2746 case 22: // calling number
2747 memset(calling
, 0, sizeof(calling
));
2748 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2749 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2753 case 24: // tx connect speed
2756 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2760 // AS5300s send connect speed as a string
2762 memset(tmp
, 0, sizeof(tmp
));
2763 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2764 session
[s
].tx_connect_speed
= atol(tmp
);
2766 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2768 case 38: // rx connect speed
2771 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2775 // AS5300s send connect speed as a string
2777 memset(tmp
, 0, sizeof(tmp
));
2778 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2779 session
[s
].rx_connect_speed
= atol(tmp
);
2781 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2783 case 25: // Physical Channel ID
2785 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2786 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2789 case 29: // Proxy Authentication Type
2791 uint16_t atype
= ntohs(*(uint16_t *)b
);
2792 LOG(4, s
, t
, " Proxy Auth Type %u (%s)\n", atype
, ppp_auth_type(atype
));
2795 case 30: // Proxy Authentication Name
2798 memset(authname
, 0, sizeof(authname
));
2799 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2800 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2804 case 31: // Proxy Authentication Challenge
2806 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2809 case 32: // Proxy Authentication ID
2811 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2812 LOG(4, s
, t
, " Proxy Auth ID (%u)\n", authid
);
2815 case 33: // Proxy Authentication Response
2816 LOG(4, s
, t
, " Proxy Auth Response\n");
2818 case 27: // last sent lcp
2819 { // find magic number
2820 uint8_t *p
= b
, *e
= p
+ n
;
2821 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2823 if (*p
== 5 && p
[1] == 6) // Magic-Number
2824 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2825 else if (*p
== 7) // Protocol-Field-Compression
2826 aflags
|= SESSION_PFC
;
2827 else if (*p
== 8) // Address-and-Control-Field-Compression
2828 aflags
|= SESSION_ACFC
;
2833 case 28: // last recv lcp confreq
2835 case 26: // Initial Received LCP CONFREQ
2837 case 39: // seq required - we control it as an LNS anyway...
2839 case 36: // Random Vector
2840 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2841 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2842 if (n
> sizeof(session
[s
].random_vector
))
2843 n
= sizeof(session
[s
].random_vector
);
2844 memcpy(session
[s
].random_vector
, b
, n
);
2845 session
[s
].random_vector_length
= n
;
2847 case 46: // ppp disconnect cause
2850 uint16_t code
= ntohs(*(uint16_t *) b
);
2851 uint16_t proto
= ntohs(*(uint16_t *) (b
+ 2));
2852 uint8_t dir
= *(b
+ 4);
2854 LOG(4, s
, t
, " PPP disconnect cause "
2855 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2856 code
, proto
, dir
, n
- 5, b
+ 5);
2858 disc_cause_set
= mtype
;
2862 case 1: // admin disconnect
2863 disc_cause
= TERM_ADMIN_RESET
;
2864 disc_reason
= "Administrative disconnect";
2866 case 3: // lcp terminate
2867 if (dir
!= 2) break; // 1=peer (LNS), 2=local (LAC)
2868 disc_cause
= TERM_USER_REQUEST
;
2869 disc_reason
= "Normal disconnection";
2871 case 4: // compulsory encryption unavailable
2872 if (dir
!= 1) break; // 1=refused by peer, 2=local
2873 disc_cause
= TERM_USER_ERROR
;
2874 disc_reason
= "Compulsory encryption refused";
2876 case 5: // lcp: fsm timeout
2877 disc_cause
= TERM_PORT_ERROR
;
2878 disc_reason
= "LCP: FSM timeout";
2880 case 6: // lcp: no recognisable lcp packets received
2881 disc_cause
= TERM_PORT_ERROR
;
2882 disc_reason
= "LCP: no recognisable LCP packets";
2884 case 7: // lcp: magic-no error (possibly looped back)
2885 disc_cause
= TERM_PORT_ERROR
;
2886 disc_reason
= "LCP: magic-no error (possible loop)";
2888 case 8: // lcp: echo request timeout
2889 disc_cause
= TERM_PORT_ERROR
;
2890 disc_reason
= "LCP: echo request timeout";
2892 case 13: // auth: fsm timeout
2893 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2894 disc_reason
= "Authentication: FSM timeout";
2896 case 15: // auth: unacceptable auth protocol
2897 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2898 disc_reason
= "Unacceptable authentication protocol";
2900 case 16: // auth: authentication failed
2901 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2902 disc_reason
= "Authentication failed";
2904 case 17: // ncp: fsm timeout
2905 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2906 disc_reason
= "NCP: FSM timeout";
2908 case 18: // ncp: no ncps available
2909 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2910 disc_reason
= "NCP: no NCPs available";
2912 case 19: // ncp: failure to converge on acceptable address
2913 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2914 disc_reason
= (dir
== 1)
2915 ? "NCP: too many Configure-Naks received from peer"
2916 : "NCP: too many Configure-Naks sent to peer";
2918 case 20: // ncp: user not permitted to use any address
2919 disc_cause
= TERM_SERVICE_UNAVAILABLE
;
2920 disc_reason
= (dir
== 1)
2921 ? "NCP: local link address not acceptable to peer"
2922 : "NCP: remote link address not acceptable";
2929 static char e
[] = "unknown AVP 0xXXXX";
2930 LOG(2, s
, t
, " Unknown AVP type %u\n", mtype
);
2932 result
= 2; // general error
2933 error
= 8; // unknown mandatory AVP
2934 sprintf((msg
= e
) + 14, "%04x", mtype
);
2941 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2945 case 1: // SCCRQ - Start Control Connection Request
2946 tunnel
[t
].state
= TUNNELOPENING
;
2947 if (main_quit
!= QUIT_SHUTDOWN
)
2949 controlt
*c
= controlnew(2); // sending SCCRP
2950 control16(c
, 2, version
, 1); // protocol version
2951 control32(c
, 3, 3, 1); // framing
2952 controls(c
, 7, hostname
, 1); // host name
2953 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2954 control16(c
, 9, t
, 1); // assigned tunnel
2955 controladd(c
, 0, t
); // send the resply
2959 tunnelshutdown(t
, "Shutting down", 6, 0, 0);
2963 tunnel
[t
].state
= TUNNELOPEN
;
2964 tunnel
[t
].lastrec
= time_now
;
2967 tunnel
[t
].state
= TUNNELOPEN
;
2968 tunnel
[t
].lastrec
= time_now
;
2969 controlnull(t
); // ack
2972 controlnull(t
); // ack
2973 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2976 controlnull(t
); // simply ACK
2988 if (sessionfree
&& main_quit
!= QUIT_SHUTDOWN
)
2990 controlt
*c
= controlnew(11); // ICRP
2993 sessionfree
= session
[s
].next
;
2994 memset(&session
[s
], 0, sizeof(session
[s
]));
2996 if (s
> config
->cluster_highest_sessionid
)
2997 config
->cluster_highest_sessionid
= s
;
2999 session
[s
].opened
= time_now
;
3000 session
[s
].tunnel
= t
;
3001 session
[s
].far
= asession
;
3002 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3003 LOG(3, s
, t
, "New session (%u/%u)\n", tunnel
[t
].far
, session
[s
].far
);
3004 control16(c
, 14, s
, 1); // assigned session
3005 controladd(c
, asession
, t
); // send the reply
3007 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
3008 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
3010 session
[s
].ppp
.phase
= Establish
;
3011 session
[s
].ppp
.lcp
= Starting
;
3013 STAT(session_created
);
3018 controlt
*c
= controlnew(14); // CDN
3021 STAT(session_overflow
);
3022 LOG(1, 0, t
, "No free sessions\n");
3023 control16(c
, 1, 4, 0); // temporary lack of resources
3026 control16(c
, 1, 2, 7); // shutting down, try another
3028 controladd(c
, asession
, t
); // send the message
3035 if (amagic
== 0) amagic
= time_now
;
3036 session
[s
].magic
= amagic
; // set magic number
3037 session
[s
].flags
= aflags
; // set flags received
3038 session
[s
].mru
= PPPoE_MRU
; // default
3039 controlnull(t
); // ack
3042 sess_local
[s
].lcp_authtype
= config
->radius_authprefer
;
3043 sess_local
[s
].ppp_mru
= MRU
;
3045 // Set multilink options before sending initial LCP packet
3046 sess_local
[s
].mp_mrru
= 1614;
3047 sess_local
[s
].mp_epdis
= ntohl(config
->bind_address
? config
->bind_address
: my_address
);
3050 change_state(s
, lcp
, RequestSent
);
3054 controlnull(t
); // ack
3055 sessionshutdown(s
, disc_reason
, CDN_NONE
, disc_cause
);
3058 LOG(1, s
, t
, "Missing message type\n");
3061 STAT(tunnel_rx_errors
);
3063 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
3065 LOG(1, s
, t
, "Unknown message type %u\n", message
);
3068 if (chapresponse
) free(chapresponse
);
3069 cluster_send_tunnel(t
);
3073 LOG(4, s
, t
, " Got a ZLB ack\n");
3080 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
3081 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
3082 { // HDLC address header, discard
3088 LOG(1, s
, t
, "Short ppp length %d\n", l
);
3089 STAT(tunnel_rx_errors
);
3099 proto
= ntohs(*(uint16_t *) p
);
3104 if (s
&& !session
[s
].opened
) // Is something wrong??
3106 if (!config
->cluster_iam_master
)
3108 // Pass it off to the master to deal with..
3109 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3114 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
3115 STAT(tunnel_rx_errors
);
3119 if (proto
== PPPPAP
)
3121 session
[s
].last_packet
= time_now
;
3122 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3123 processpap(s
, t
, p
, l
);
3125 else if (proto
== PPPCHAP
)
3127 session
[s
].last_packet
= time_now
;
3128 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3129 processchap(s
, t
, p
, l
);
3131 else if (proto
== PPPLCP
)
3133 session
[s
].last_packet
= time_now
;
3134 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3135 processlcp(s
, t
, p
, l
);
3137 else if (proto
== PPPIPCP
)
3139 session
[s
].last_packet
= time_now
;
3140 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3141 processipcp(s
, t
, p
, l
);
3143 else if (proto
== PPPIPV6CP
&& config
->ipv6_prefix
.s6_addr
[0])
3145 session
[s
].last_packet
= time_now
;
3146 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3147 processipv6cp(s
, t
, p
, l
);
3149 else if (proto
== PPPCCP
)
3151 session
[s
].last_packet
= time_now
;
3152 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3153 processccp(s
, t
, p
, l
);
3155 else if (proto
== PPPIP
)
3159 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3160 return; // closing session, PPP not processed
3163 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3164 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3166 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3170 processipin(s
, t
, p
, l
);
3172 else if (proto
== PPPMP
)
3176 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3177 return; // closing session, PPP not processed
3180 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3181 if (!config
->cluster_iam_master
)
3183 // The fragments reconstruction is managed by the Master.
3184 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3188 processmpin(s
, t
, p
, l
);
3190 else if (proto
== PPPIPV6
&& config
->ipv6_prefix
.s6_addr
[0])
3194 LOG(4, s
, t
, "Session %u is closing. Don't process PPP packets\n", s
);
3195 return; // closing session, PPP not processed
3198 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
3199 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
3201 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
3205 processipv6in(s
, t
, p
, l
);
3207 else if (session
[s
].ppp
.lcp
== Opened
)
3209 session
[s
].last_packet
= time_now
;
3210 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
3211 protoreject(s
, t
, p
, l
, proto
);
3215 LOG(2, s
, t
, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3216 proto
, ppp_state(session
[s
].ppp
.lcp
));
3221 // read and process packet on tun
3222 // (i.e. this routine writes to buf[-8]).
3223 static void processtun(uint8_t * buf
, int len
)
3225 LOG_HEX(5, "Receive TUN Data", buf
, len
);
3226 STAT(tun_rx_packets
);
3227 INC_STAT(tun_rx_bytes
, len
);
3235 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
3236 STAT(tun_rx_errors
);
3240 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
3241 processipout(buf
, len
);
3242 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
3243 && config
->ipv6_prefix
.s6_addr
[0])
3244 processipv6out(buf
, len
);
3249 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3250 // that we look at the whole of the tunnel, radius and session tables
3252 static void regular_cleanups(double period
)
3254 // Next tunnel, radius and session to check for actions on.
3255 static tunnelidt t
= 0;
3257 static sessionidt s
= 0;
3270 // divide up tables into slices based on the last run
3271 t_slice
= config
->cluster_highest_tunnelid
* period
;
3272 r_slice
= (MAXRADIUS
- 1) * period
;
3273 s_slice
= config
->cluster_highest_sessionid
* period
;
3277 else if (t_slice
> config
->cluster_highest_tunnelid
)
3278 t_slice
= config
->cluster_highest_tunnelid
;
3282 else if (r_slice
> (MAXRADIUS
- 1))
3283 r_slice
= MAXRADIUS
- 1;
3287 else if (s_slice
> config
->cluster_highest_sessionid
)
3288 s_slice
= config
->cluster_highest_sessionid
;
3290 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period
);
3292 for (i
= 0; i
< t_slice
; i
++)
3295 if (t
> config
->cluster_highest_tunnelid
)
3298 // check for expired tunnels
3299 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
3301 STAT(tunnel_timeout
);
3302 tunnelkill(t
, "Expired");
3306 // check for message resend
3307 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
3309 // resend pending messages as timeout on reply
3310 if (tunnel
[t
].retry
<= TIME
)
3312 controlt
*c
= tunnel
[t
].controls
;
3313 uint16_t w
= tunnel
[t
].window
;
3314 tunnel
[t
].try++; // another try
3315 if (tunnel
[t
].try > 5)
3316 tunnelkill(t
, "Timeout on control message"); // game over
3320 tunnelsend(c
->buf
, c
->length
, t
);
3328 if (tunnel
[t
].state
== TUNNELOPEN
&& !tunnel
[t
].controlc
&& (time_now
- tunnel
[t
].lastrec
) > 60)
3330 controlt
*c
= controlnew(6); // sending HELLO
3331 controladd(c
, 0, t
); // send the message
3332 LOG(3, 0, t
, "Sending HELLO message\n");
3336 // Check for tunnel changes requested from the CLI
3337 if ((a
= cli_tunnel_actions
[t
].action
))
3339 cli_tunnel_actions
[t
].action
= 0;
3340 if (a
& CLI_TUN_KILL
)
3342 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
3343 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
3349 for (i
= 0; i
< r_slice
; i
++)
3355 if (!radius
[r
].state
)
3358 if (radius
[r
].retry
<= TIME
)
3365 for (i
= 0; i
< s_slice
; i
++)
3368 if (s
> config
->cluster_highest_sessionid
)
3371 if (!session
[s
].opened
) // Session isn't in use
3374 // check for expired sessions
3377 if (session
[s
].die
<= TIME
)
3379 sessionkill(s
, "Expired");
3386 if (sess_local
[s
].lcp
.restart
<= time_now
)
3388 int next_state
= session
[s
].ppp
.lcp
;
3389 switch (session
[s
].ppp
.lcp
)
3393 next_state
= RequestSent
;
3396 if (sess_local
[s
].lcp
.conf_sent
< config
->ppp_max_configure
)
3398 LOG(3, s
, session
[s
].tunnel
, "No ACK for LCP ConfigReq... resending\n");
3399 sendlcp(s
, session
[s
].tunnel
);
3400 change_state(s
, lcp
, next_state
);
3404 sessionshutdown(s
, "No response to LCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3405 STAT(session_timeout
);
3415 if (sess_local
[s
].ipcp
.restart
<= time_now
)
3417 int next_state
= session
[s
].ppp
.ipcp
;
3418 switch (session
[s
].ppp
.ipcp
)
3422 next_state
= RequestSent
;
3425 if (sess_local
[s
].ipcp
.conf_sent
< config
->ppp_max_configure
)
3427 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPCP ConfigReq... resending\n");
3428 sendipcp(s
, session
[s
].tunnel
);
3429 change_state(s
, ipcp
, next_state
);
3433 sessionshutdown(s
, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3434 STAT(session_timeout
);
3444 if (sess_local
[s
].ipv6cp
.restart
<= time_now
)
3446 int next_state
= session
[s
].ppp
.ipv6cp
;
3447 switch (session
[s
].ppp
.ipv6cp
)
3451 next_state
= RequestSent
;
3454 if (sess_local
[s
].ipv6cp
.conf_sent
< config
->ppp_max_configure
)
3456 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq... resending\n");
3457 sendipv6cp(s
, session
[s
].tunnel
);
3458 change_state(s
, ipv6cp
, next_state
);
3462 LOG(3, s
, session
[s
].tunnel
, "No ACK for IPV6CP ConfigReq\n");
3463 change_state(s
, ipv6cp
, Stopped
);
3470 if (sess_local
[s
].ccp
.restart
<= time_now
)
3472 int next_state
= session
[s
].ppp
.ccp
;
3473 switch (session
[s
].ppp
.ccp
)
3477 next_state
= RequestSent
;
3480 if (sess_local
[s
].ccp
.conf_sent
< config
->ppp_max_configure
)
3482 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq... resending\n");
3483 sendccp(s
, session
[s
].tunnel
);
3484 change_state(s
, ccp
, next_state
);
3488 LOG(3, s
, session
[s
].tunnel
, "No ACK for CCP ConfigReq\n");
3489 change_state(s
, ccp
, Stopped
);
3496 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3497 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= config
->idle_echo_timeout
))
3499 sessionshutdown(s
, "No response to LCP ECHO requests.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
3500 STAT(session_timeout
);
3505 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3506 if (session
[s
].ppp
.phase
>= Establish
&& (time_now
- session
[s
].last_packet
>= config
->echo_timeout
) &&
3507 (time_now
- sess_local
[s
].last_echo
>= ECHO_TIMEOUT
))
3509 uint8_t b
[MAXETHER
];
3511 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, s
, session
[s
].tunnel
, PPPLCP
, 1, 0, 0);
3515 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
3516 *(uint16_t *)(q
+ 2) = htons(8); // Length
3517 *(uint32_t *)(q
+ 4) = session
[s
].ppp
.lcp
== Opened
? htonl(session
[s
].magic
) : 0; // Magic Number
3519 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
3520 (int)(time_now
- session
[s
].last_packet
));
3521 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
3522 sess_local
[s
].last_echo
= time_now
;
3526 // Drop sessions who have reached session_timeout seconds
3527 if (session
[s
].session_timeout
)
3529 bundleidt bid
= session
[s
].bundle
;
3532 if (time_now
- bundle
[bid
].last_check
>= 1)
3534 bundle
[bid
].online_time
+= (time_now
- bundle
[bid
].last_check
) * bundle
[bid
].num_of_links
;
3535 bundle
[bid
].last_check
= time_now
;
3536 if (bundle
[bid
].online_time
>= session
[s
].session_timeout
)
3539 for (ses
= bundle
[bid
].num_of_links
- 1; ses
>= 0; ses
--)
3541 sessionshutdown(bundle
[bid
].members
[ses
], "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3548 else if (time_now
- session
[s
].opened
>= session
[s
].session_timeout
)
3550 sessionshutdown(s
, "Session timeout", CDN_ADMIN_DISC
, TERM_SESSION_TIMEOUT
);
3556 // Drop sessions who have reached idle_timeout seconds
3557 if (session
[s
].last_data
&& session
[s
].idle_timeout
&& (time_now
- session
[s
].last_data
>= session
[s
].idle_timeout
))
3559 sessionshutdown(s
, "Idle Timeout Reached", CDN_ADMIN_DISC
, TERM_IDLE_TIMEOUT
);
3560 STAT(session_timeout
);
3565 // Check for actions requested from the CLI
3566 if ((a
= cli_session_actions
[s
].action
))
3570 cli_session_actions
[s
].action
= 0;
3571 if (a
& CLI_SESS_KILL
)
3573 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
3574 sessionshutdown(s
, "Requested by administrator.", CDN_ADMIN_DISC
, TERM_ADMIN_RESET
);
3575 a
= 0; // dead, no need to check for other actions
3579 if (a
& CLI_SESS_NOSNOOP
)
3581 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
3582 session
[s
].snoop_ip
= 0;
3583 session
[s
].snoop_port
= 0;
3587 else if (a
& CLI_SESS_SNOOP
)
3589 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%u)\n",
3590 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
3591 cli_session_actions
[s
].snoop_port
);
3593 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
3594 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
3599 if (a
& CLI_SESS_NOTHROTTLE
)
3601 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
3602 throttle_session(s
, 0, 0);
3606 else if (a
& CLI_SESS_THROTTLE
)
3608 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3609 cli_session_actions
[s
].throttle_in
,
3610 cli_session_actions
[s
].throttle_out
);
3612 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
3617 if (a
& CLI_SESS_NOFILTER
)
3619 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
3620 filter_session(s
, 0, 0);
3624 else if (a
& CLI_SESS_FILTER
)
3626 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
3627 cli_session_actions
[s
].filter_in
,
3628 cli_session_actions
[s
].filter_out
);
3630 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
3636 cluster_send_session(s
);
3639 // RADIUS interim accounting
3640 if (config
->radius_accounting
&& config
->radius_interim
> 0
3641 && session
[s
].ip
&& !session
[s
].walled_garden
3642 && !sess_local
[s
].radius
// RADIUS already in progress
3643 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
3644 && session
[s
].flags
& SESSION_STARTED
)
3646 int rad
= radiusnew(s
);
3649 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
3650 STAT(radius_overflow
);
3654 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
3655 session
[s
].user
, session
[s
].unique_id
);
3657 radiussend(rad
, RADIUSINTERIM
);
3658 sess_local
[s
].last_interim
= time_now
;
3663 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3664 t_slice
, r_slice
, s_slice
, t_actions
, r_actions
, s_actions
);
3668 // Are we in the middle of a tunnel update, or radius
3671 static int still_busy(void)
3674 static clockt last_talked
= 0;
3675 static clockt start_busy_wait
= 0;
3678 static time_t stopped_bgp
= 0;
3683 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY
);
3685 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3686 if (bgp_peers
[i
].state
== Established
)
3687 bgp_stop(&bgp_peers
[i
]);
3689 stopped_bgp
= time_now
;
3691 if (!config
->cluster_iam_master
)
3693 // we don't want to become master
3694 cluster_send_ping(0);
3700 if (!config
->cluster_iam_master
&& time_now
< (stopped_bgp
+ QUIT_DELAY
))
3705 if (!config
->cluster_iam_master
)
3708 if (main_quit
== QUIT_SHUTDOWN
)
3710 static int dropped
= 0;
3715 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3716 for (i
= 1; i
< MAXTUNNEL
; i
++)
3717 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3718 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3724 if (start_busy_wait
== 0)
3725 start_busy_wait
= TIME
;
3727 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
3729 if (!tunnel
[i
].controlc
)
3732 if (last_talked
!= TIME
)
3734 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i
);
3740 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3741 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
3743 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3747 for (i
= 1; i
< MAXRADIUS
; i
++)
3749 if (radius
[i
].state
== RADIUSNULL
)
3751 if (radius
[i
].state
== RADIUSWAIT
)
3754 if (last_talked
!= TIME
)
3756 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i
, radius
[i
].session
);
3766 # include <sys/epoll.h>
3768 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3769 # include "fake_epoll.h"
3772 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3775 // additional polled fds
3777 # define EXTRA_FDS BGP_NUM_PEERS
3779 # define EXTRA_FDS 0
3782 // main loop - gets packets on tun or udp and processes them
3783 static void mainloop(void)
3787 uint8_t *p
= buf
+ 8; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3788 int size_bufp
= sizeof(buf
) - 8;
3789 clockt next_cluster_ping
= 0; // send initial ping immediately
3790 struct epoll_event events
[BASE_FDS
+ RADIUS_FDS
+ EXTRA_FDS
];
3791 int maxevent
= sizeof(events
)/sizeof(*events
);
3793 if ((epollfd
= epoll_create(maxevent
)) < 0)
3795 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno
));
3799 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3800 clifd
, cluster_sockfd
, tunfd
, udpfd
, controlfd
, daefd
, nlfd
);
3802 /* setup our fds to poll for input */
3804 static struct event_data d
[BASE_FDS
];
3805 struct epoll_event e
;
3812 d
[i
].type
= FD_TYPE_CLI
;
3813 e
.data
.ptr
= &d
[i
++];
3814 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, clifd
, &e
);
3817 d
[i
].type
= FD_TYPE_CLUSTER
;
3818 e
.data
.ptr
= &d
[i
++];
3819 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, cluster_sockfd
, &e
);
3821 d
[i
].type
= FD_TYPE_TUN
;
3822 e
.data
.ptr
= &d
[i
++];
3823 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, tunfd
, &e
);
3825 d
[i
].type
= FD_TYPE_UDP
;
3826 e
.data
.ptr
= &d
[i
++];
3827 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, udpfd
, &e
);
3829 d
[i
].type
= FD_TYPE_CONTROL
;
3830 e
.data
.ptr
= &d
[i
++];
3831 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, controlfd
, &e
);
3833 d
[i
].type
= FD_TYPE_DAE
;
3834 e
.data
.ptr
= &d
[i
++];
3835 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, daefd
, &e
);
3837 d
[i
].type
= FD_TYPE_NETLINK
;
3838 e
.data
.ptr
= &d
[i
++];
3839 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, nlfd
, &e
);
3843 signal(SIGPIPE
, SIG_IGN
);
3844 bgp_setup(config
->as_number
);
3845 if (config
->bind_address
)
3846 bgp_add_route(config
->bind_address
, 0xffffffff);
3848 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3850 if (config
->neighbour
[i
].name
[0])
3851 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3852 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3853 config
->neighbour
[i
].hold
, config
->neighbour
[i
].update_source
,
3854 0); /* 0 = routing disabled */
3858 while (!main_quit
|| still_busy())
3868 config
->reload_config
++;
3871 if (config
->reload_config
)
3873 config
->reload_config
= 0;
3881 n
= epoll_wait(epollfd
, events
, maxevent
, 100); // timeout 100ms (1/10th sec)
3882 STAT(select_called
);
3887 if (errno
== EINTR
||
3888 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
3891 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
3897 struct sockaddr_in addr
;
3898 struct in_addr local
;
3903 int cluster_ready
= 0;
3906 int cluster_pkts
= 0;
3908 uint32_t bgp_events
[BGP_NUM_PEERS
];
3909 memset(bgp_events
, 0, sizeof(bgp_events
));
3912 for (c
= n
, i
= 0; i
< c
; i
++)
3914 struct event_data
*d
= events
[i
].data
.ptr
;
3918 case FD_TYPE_CLI
: // CLI connections
3922 alen
= sizeof(addr
);
3923 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
3929 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
3935 // these are handled below, with multiple interleaved reads
3936 case FD_TYPE_CLUSTER
: cluster_ready
++; break;
3937 case FD_TYPE_TUN
: tun_ready
++; break;
3938 case FD_TYPE_UDP
: udp_ready
++; break;
3940 case FD_TYPE_CONTROL
: // nsctl commands
3941 alen
= sizeof(addr
);
3942 s
= recvfromto(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
3943 if (s
> 0) processcontrol(buf
, s
, &addr
, alen
, &local
);
3947 case FD_TYPE_DAE
: // DAE requests
3948 alen
= sizeof(addr
);
3949 s
= recvfromto(daefd
, buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
, &local
);
3950 if (s
> 0) processdae(buf
, s
, &addr
, alen
, &local
);
3954 case FD_TYPE_RADIUS
: // RADIUS response
3955 alen
= sizeof(addr
);
3956 s
= recvfrom(radfds
[d
->index
], buf
, sizeof(buf
), MSG_WAITALL
, (struct sockaddr
*) &addr
, &alen
);
3957 if (s
>= 0 && config
->cluster_iam_master
)
3959 if (addr
.sin_addr
.s_addr
== config
->radiusserver
[0] ||
3960 addr
.sin_addr
.s_addr
== config
->radiusserver
[1])
3961 processrad(buf
, s
, d
->index
);
3963 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
3964 fmtaddr(addr
.sin_addr
.s_addr
, 0));
3972 bgp_events
[d
->index
] = events
[i
].events
;
3977 case FD_TYPE_NETLINK
:
3979 struct nlmsghdr
*nh
= (struct nlmsghdr
*)buf
;
3980 s
= netlink_recv(buf
, sizeof(buf
));
3981 if (nh
->nlmsg_type
== NLMSG_ERROR
)
3983 struct nlmsgerr
*errmsg
= NLMSG_DATA(nh
);
3986 if (errmsg
->msg
.nlmsg_seq
< min_initok_nlseqnum
)
3988 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg
[nh
->nlmsg_seq
], strerror(-errmsg
->error
));
3993 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg
->error
));
3998 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
);
4004 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d
->type
);
4009 bgp_process(bgp_events
);
4012 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
4017 alen
= sizeof(addr
);
4018 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
4020 processudp(buf
, s
, &addr
);
4033 if ((s
= read(tunfd
, p
, size_bufp
)) > 0)
4048 alen
= sizeof(addr
);
4049 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
4051 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
4062 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
4063 STAT(multi_read_used
);
4065 if (c
>= config
->multi_read_count
)
4067 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
4068 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
4070 STAT(multi_read_exceeded
);
4076 /* no event received, but timers could still have expired */
4077 bgp_process_peers_timers();
4082 double Mbps
= 1024.0 * 1024.0 / 8 * time_changed
;
4084 // Log current traffic stats
4085 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
4086 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4087 (udp_rx
/ Mbps
), (eth_tx
/ Mbps
), (eth_rx
/ Mbps
), (udp_tx
/ Mbps
),
4088 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / Mbps
),
4089 udp_rx_pkt
/ time_changed
, eth_rx_pkt
/ time_changed
);
4091 udp_tx
= udp_rx
= 0;
4092 udp_rx_pkt
= eth_rx_pkt
= 0;
4093 eth_tx
= eth_rx
= 0;
4096 if (config
->dump_speed
)
4097 printf("%s\n", config
->bandwidth
);
4099 // Update the internal time counter
4100 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4104 struct param_timer p
= { time_now
};
4105 run_plugins(PLUGIN_TIMER
, &p
);
4109 // Runs on every machine (master and slaves).
4110 if (next_cluster_ping
<= TIME
)
4112 // Check to see which of the cluster is still alive..
4114 cluster_send_ping(basetime
); // Only does anything if we're a slave
4115 cluster_check_master(); // ditto.
4117 cluster_heartbeat(); // Only does anything if we're a master.
4118 cluster_check_slaves(); // ditto.
4120 master_update_counts(); // If we're a slave, send our byte counters to our master.
4122 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
4123 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
4125 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
4128 if (!config
->cluster_iam_master
)
4131 // Run token bucket filtering queue..
4132 // Only run it every 1/10th of a second.
4134 static clockt last_run
= 0;
4135 if (last_run
!= TIME
)
4142 // Handle timeouts, retries etc.
4144 static double last_clean
= 0;
4148 TIME
= now(&this_clean
);
4149 diff
= this_clean
- last_clean
;
4151 // Run during idle time (after we've handled
4152 // all incoming packets) or every 1/10th sec
4153 if (!more
|| diff
> 0.1)
4155 regular_cleanups(diff
);
4156 last_clean
= this_clean
;
4160 if (*config
->accounting_dir
)
4162 static clockt next_acct
= 0;
4163 static clockt next_shut_acct
= 0;
4165 if (next_acct
<= TIME
)
4167 // Dump accounting data
4168 next_acct
= TIME
+ ACCT_TIME
;
4169 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4172 else if (next_shut_acct
<= TIME
)
4174 // Dump accounting data for shutdown sessions
4175 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
4182 // Are we the master and shutting down??
4183 if (config
->cluster_iam_master
)
4184 cluster_heartbeat(); // Flush any queued changes..
4186 // Ok. Notify everyone we're shutting down. If we're
4187 // the master, this will force an election.
4188 cluster_send_ping(0);
4191 // Important!!! We MUST not process any packets past this point!
4192 LOG(1, 0, 0, "Shutdown complete\n");
4195 static void stripdomain(char *host
)
4199 if ((p
= strchr(host
, '.')))
4205 FILE *resolv
= fopen("/etc/resolv.conf", "r");
4211 while (fgets(buf
, sizeof(buf
), resolv
))
4213 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
4216 if (!isspace(buf
[6]))
4220 while (isspace(*b
)) b
++;
4225 while (*b
&& !isspace(*b
)) b
++;
4227 if (buf
[0] == 'd') // domain is canonical
4233 // first search line
4236 // hold, may be subsequent domain line
4237 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
4248 int hl
= strlen(host
);
4249 int dl
= strlen(domain
);
4250 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
4251 host
[hl
-dl
- 1] = 0;
4255 *p
= 0; // everything after first dot
4260 // Init data structures
4261 static void initdata(int optdebug
, char *optconfig
)
4265 if (!(config
= shared_malloc(sizeof(configt
))))
4267 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
4271 memset(config
, 0, sizeof(configt
));
4272 time(&config
->start_time
);
4273 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
4274 config
->debug
= optdebug
;
4275 config
->num_tbfs
= MAXTBFS
;
4276 config
->rl_rate
= 28; // 28kbps
4277 config
->cluster_mcast_ttl
= 1;
4278 config
->cluster_master_min_adv
= 1;
4279 config
->ppp_restart_time
= 3;
4280 config
->ppp_max_configure
= 10;
4281 config
->ppp_max_failure
= 5;
4282 config
->kill_timedout_sessions
= 1;
4283 strcpy(config
->random_device
, RANDOMDEVICE
);
4284 // Set default value echo_timeout and idle_echo_timeout
4285 config
->echo_timeout
= ECHO_TIMEOUT
;
4286 config
->idle_echo_timeout
= IDLE_ECHO_TIMEOUT
;
4288 log_stream
= stderr
;
4291 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
4293 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
4296 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
4299 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
4301 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
4304 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
4306 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
4309 if (!(bundle
= shared_malloc(sizeof(bundlet
) * MAXBUNDLE
)))
4311 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno
));
4314 if (!(frag
= shared_malloc(sizeof(fragmentationt
) * MAXBUNDLE
)))
4316 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno
));
4319 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
4321 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
4325 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
4327 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
4331 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
4333 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
4337 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
4339 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
4343 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
4345 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
4348 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
4350 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
4352 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
4355 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
4357 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
4359 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
4362 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
4364 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
4365 memset(bundle
, 0, sizeof(bundlet
) * MAXBUNDLE
);
4366 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
4367 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
4368 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
4370 // Put all the sessions on the free list marked as undefined.
4371 for (i
= 1; i
< MAXSESSION
; i
++)
4373 session
[i
].next
= i
+ 1;
4374 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
4376 session
[MAXSESSION
- 1].next
= 0;
4379 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4380 for (i
= 1; i
< MAXTUNNEL
; i
++)
4381 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
4383 for (i
= 1; i
< MAXBUNDLE
; i
++) {
4384 bundle
[i
].state
= BUNDLEUNDEF
;
4389 // Grab my hostname unless it's been specified
4390 gethostname(hostname
, sizeof(hostname
));
4391 stripdomain(hostname
);
4394 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
4397 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
4399 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
4405 static int assign_ip_address(sessionidt s
)
4409 time_t best_time
= time_now
;
4410 char *u
= session
[s
].user
;
4414 CSTAT(assign_ip_address
);
4416 for (i
= 1; i
< ip_pool_size
; i
++)
4418 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
4421 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
4428 if (ip_address_pool
[i
].last
< best_time
)
4431 if (!(best_time
= ip_address_pool
[i
].last
))
4432 break; // never used, grab this one
4438 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
4442 session
[s
].ip
= ip_address_pool
[best
].address
;
4443 session
[s
].ip_pool_index
= best
;
4444 ip_address_pool
[best
].assigned
= 1;
4445 ip_address_pool
[best
].last
= time_now
;
4446 ip_address_pool
[best
].session
= s
;
4447 if (session
[s
].walled_garden
)
4448 /* Don't track addresses of users in walled garden (note: this
4449 means that their address isn't "sticky" even if they get
4451 ip_address_pool
[best
].user
[0] = 0;
4453 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
4456 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
4457 reuse
? "Reusing" : "Allocating", best
);
4462 static void free_ip_address(sessionidt s
)
4464 int i
= session
[s
].ip_pool_index
;
4467 CSTAT(free_ip_address
);
4470 return; // what the?
4472 if (i
< 0) // Is this actually part of the ip pool?
4476 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
4478 ip_address_pool
[i
].assigned
= 0;
4479 ip_address_pool
[i
].session
= 0;
4480 ip_address_pool
[i
].last
= time_now
;
4484 // Fsck the address pool against the session table.
4485 // Normally only called when we become a master.
4487 // This isn't perfect: We aren't keep tracking of which
4488 // users used to have an IP address.
4490 void rebuild_address_pool(void)
4495 // Zero the IP pool allocation, and build
4496 // a map from IP address to pool index.
4497 for (i
= 1; i
< MAXIPPOOL
; ++i
)
4499 ip_address_pool
[i
].assigned
= 0;
4500 ip_address_pool
[i
].session
= 0;
4501 if (!ip_address_pool
[i
].address
)
4504 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
4507 for (i
= 0; i
< MAXSESSION
; ++i
)
4510 if (!(session
[i
].opened
&& session
[i
].ip
))
4513 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
4515 if (session
[i
].ip_pool_index
< 0)
4517 // Not allocated out of the pool.
4518 if (ipid
< 1) // Not found in the pool either? good.
4521 LOG(0, i
, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4522 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
4524 // Fall through and process it as part of the pool.
4528 if (ipid
> MAXIPPOOL
|| ipid
< 0)
4530 LOG(0, i
, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
4532 session
[i
].ip_pool_index
= ipid
;
4536 ip_address_pool
[ipid
].assigned
= 1;
4537 ip_address_pool
[ipid
].session
= i
;
4538 ip_address_pool
[ipid
].last
= time_now
;
4539 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4540 session
[i
].ip_pool_index
= ipid
;
4541 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
4546 // Fix the address pool to match a changed session.
4547 // (usually when the master sends us an update).
4548 static void fix_address_pool(int sid
)
4552 ipid
= session
[sid
].ip_pool_index
;
4554 if (ipid
> ip_pool_size
)
4555 return; // Ignore it. rebuild_address_pool will fix it up.
4557 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
4558 return; // Just ignore it. rebuild_address_pool will take care of it.
4560 ip_address_pool
[ipid
].assigned
= 1;
4561 ip_address_pool
[ipid
].session
= sid
;
4562 ip_address_pool
[ipid
].last
= time_now
;
4563 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
4567 // Add a block of addresses to the IP pool to hand out.
4569 static void add_to_ip_pool(in_addr_t addr
, int prefixlen
)
4573 prefixlen
= 32; // Host route only.
4575 addr
&= 0xffffffff << (32 - prefixlen
);
4577 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
4580 for (i
= addr
; i
< addr
+(1<<(32-prefixlen
)); ++i
)
4582 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
4583 continue; // Skip 0 and broadcast addresses.
4585 ip_address_pool
[ip_pool_size
].address
= i
;
4586 ip_address_pool
[ip_pool_size
].assigned
= 0;
4588 if (ip_pool_size
>= MAXIPPOOL
)
4590 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
4596 // Initialize the IP address pool
4597 static void initippool()
4602 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
4604 if (!(f
= fopen(IPPOOLFILE
, "r")))
4606 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
4610 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
4613 buf
[4095] = 0; // Force it to be zero terminated/
4615 if (*buf
== '#' || *buf
== '\n')
4616 continue; // Skip comments / blank lines
4617 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
4618 if ((p
= (char *)strchr(buf
, ':')))
4622 src
= inet_addr(buf
);
4623 if (src
== INADDR_NONE
)
4625 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
4628 // This entry is for a specific IP only
4629 if (src
!= config
->bind_address
)
4634 if ((p
= (char *)strchr(pool
, '/')))
4638 in_addr_t start
= 0;
4640 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
4642 if (!*p
|| !(numbits
= atoi(p
)))
4644 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
4647 start
= ntohl(inet_addr(pool
));
4649 // Add a static route for this pool
4650 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4651 fmtaddr(htonl(start
), 0), numbits
);
4653 routeset(0, start
, numbits
, 0, 1);
4655 add_to_ip_pool(start
, numbits
);
4659 // It's a single ip address
4660 add_to_ip_pool(ntohl(inet_addr(pool
)), 0);
4664 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
4667 void snoop_send_packet(uint8_t *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
4669 struct sockaddr_in snoop_addr
= {0};
4670 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
4673 snoop_addr
.sin_family
= AF_INET
;
4674 snoop_addr
.sin_addr
.s_addr
= destination
;
4675 snoop_addr
.sin_port
= ntohs(port
);
4677 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size
,
4678 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
4679 htons(snoop_addr
.sin_port
));
4681 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
4682 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
4684 STAT(packets_snooped
);
4687 static int dump_session(FILE **f
, sessiont
*s
)
4689 if (!s
->opened
|| !s
->ip
|| !(s
->cin_delta
|| s
->cout_delta
) || !*s
->user
|| s
->walled_garden
)
4694 char filename
[1024];
4696 time_t now
= time(NULL
);
4698 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
4699 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
4701 if (!(*f
= fopen(filename
, "w")))
4703 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
4707 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
4708 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
4713 "# format: username ip qos uptxoctets downrxoctets\n",
4715 fmtaddr(config
->bind_address
? config
->bind_address
: my_address
, 0),
4720 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
4721 fprintf(*f
, "%s %s %d %u %u\n",
4722 s
->user
, // username
4723 fmtaddr(htonl(s
->ip
), 0), // ip
4724 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
4725 (uint32_t) s
->cin_delta
, // uptxoctets
4726 (uint32_t) s
->cout_delta
); // downrxoctets
4728 s
->cin_delta
= s
->cout_delta
= 0;
4733 static void dump_acct_info(int all
)
4739 CSTAT(dump_acct_info
);
4743 for (i
= 0; i
< shut_acct_n
; i
++)
4744 dump_session(&f
, &shut_acct
[i
]);
4750 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4751 dump_session(&f
, &session
[i
]);
4758 int main(int argc
, char *argv
[])
4762 char *optconfig
= CONFIGFILE
;
4764 time(&basetime
); // start clock
4767 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
4772 if (fork()) exit(0);
4774 freopen("/dev/null", "r", stdin
);
4775 freopen("/dev/null", "w", stdout
);
4776 freopen("/dev/null", "w", stderr
);
4785 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
4788 printf("Args are:\n"
4789 "\t-d\t\tDetach from terminal\n"
4790 "\t-c <file>\tConfig file\n"
4791 "\t-h <hostname>\tForce hostname\n"
4799 // Start the timer routine off
4801 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
4804 initdata(optdebug
, optconfig
);
4808 /* set hostname /after/ having read the config file */
4809 if (*config
->hostname
)
4810 strcpy(hostname
, config
->hostname
);
4811 cli_init_complete(hostname
);
4813 init_tbf(config
->num_tbfs
);
4815 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
4816 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4817 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4820 rlim
.rlim_cur
= RLIM_INFINITY
;
4821 rlim
.rlim_max
= RLIM_INFINITY
;
4822 // Remove the maximum core size
4823 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
4824 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
4826 // Make core dumps go to /tmp
4830 if (config
->scheduler_fifo
)
4833 struct sched_param params
= {0};
4834 params
.sched_priority
= 1;
4836 if (get_nprocs() < 2)
4838 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
4839 config
->scheduler_fifo
= 0;
4843 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
4845 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
4849 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
4850 config
->scheduler_fifo
= 0;
4857 /* Set up the cluster communications port. */
4858 if (cluster_init() < 0)
4862 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
4870 unsigned seed
= time_now
^ getpid();
4871 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
4875 signal(SIGHUP
, sighup_handler
);
4876 signal(SIGCHLD
, sigchild_handler
);
4877 signal(SIGTERM
, shutdown_handler
);
4878 signal(SIGINT
, shutdown_handler
);
4879 signal(SIGQUIT
, shutdown_handler
);
4881 // Prevent us from getting paged out
4882 if (config
->lock_pages
)
4884 if (!mlockall(MCL_CURRENT
))
4885 LOG(1, 0, 0, "Locking pages into memory\n");
4887 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
4892 /* remove plugins (so cleanup code gets run) */
4895 // Remove the PID file if we wrote it
4896 if (config
->wrote_pid
&& *config
->pid_file
== '/')
4897 unlink(config
->pid_file
);
4899 /* kill CLI children */
4900 signal(SIGTERM
, SIG_IGN
);
4905 static void sighup_handler(int sig
)
4910 static void shutdown_handler(int sig
)
4912 main_quit
= (sig
== SIGQUIT
) ? QUIT_SHUTDOWN
: QUIT_FAILOVER
;
4915 static void sigchild_handler(int sig
)
4917 while (waitpid(-1, NULL
, WNOHANG
) > 0)
4921 static void build_chap_response(uint8_t *challenge
, uint8_t id
, uint16_t challenge_length
, uint8_t **challenge_response
)
4924 *challenge_response
= NULL
;
4926 if (!*config
->l2tp_secret
)
4928 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
4932 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
4934 *challenge_response
= calloc(17, 1);
4937 MD5_Update(&ctx
, &id
, 1);
4938 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
4939 MD5_Update(&ctx
, challenge
, challenge_length
);
4940 MD5_Final(*challenge_response
, &ctx
);
4945 static int facility_value(char *name
)
4948 for (i
= 0; facilitynames
[i
].c_name
; i
++)
4950 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
4951 return facilitynames
[i
].c_val
;
4956 static void update_config()
4960 static int timeout
= 0;
4961 static int interval
= 0;
4968 if (log_stream
!= stderr
)
4974 if (*config
->log_filename
)
4976 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
4978 char *p
= config
->log_filename
+ 7;
4981 openlog("l2tpns", LOG_PID
, facility_value(p
));
4985 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
4987 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
4989 fseek(log_stream
, 0, SEEK_END
);
4990 setbuf(log_stream
, NULL
);
4994 log_stream
= stderr
;
4995 setbuf(log_stream
, NULL
);
5001 log_stream
= stderr
;
5002 setbuf(log_stream
, NULL
);
5005 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5006 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5008 if (config
->l2tp_mtu
<= 0) config
->l2tp_mtu
= 1500; // ethernet default
5009 else if (config
->l2tp_mtu
< MINMTU
) config
->l2tp_mtu
= MINMTU
;
5010 else if (config
->l2tp_mtu
> MAXMTU
) config
->l2tp_mtu
= MAXMTU
;
5012 // reset MRU/MSS globals
5013 MRU
= config
->l2tp_mtu
- L2TP_HDRS
;
5014 if (MRU
> PPPoE_MRU
)
5017 MSS
= MRU
- TCP_HDRS
;
5020 config
->numradiusservers
= 0;
5021 for (i
= 0; i
< MAXRADSERVER
; i
++)
5022 if (config
->radiusserver
[i
])
5024 config
->numradiusservers
++;
5025 // Set radius port: if not set, take the port from the
5026 // first radius server. For the first radius server,
5027 // take the #defined default value from l2tpns.h
5029 // test twice, In case someone works with
5030 // a secondary radius server without defining
5031 // a primary one, this will work even then.
5032 if (i
> 0 && !config
->radiusport
[i
])
5033 config
->radiusport
[i
] = config
->radiusport
[i
-1];
5034 if (!config
->radiusport
[i
])
5035 config
->radiusport
[i
] = RADPORT
;
5038 if (!config
->numradiusservers
)
5039 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5041 // parse radius_authtypes_s
5042 config
->radius_authtypes
= config
->radius_authprefer
= 0;
5043 p
= config
->radius_authtypes_s
;
5046 char *s
= strpbrk(p
, " \t,");
5052 while (*s
== ' ' || *s
== '\t')
5059 if (!strncasecmp("chap", p
, strlen(p
)))
5061 else if (!strncasecmp("pap", p
, strlen(p
)))
5064 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
5066 config
->radius_authtypes
|= type
;
5067 if (!config
->radius_authprefer
)
5068 config
->radius_authprefer
= type
;
5073 if (!config
->radius_authtypes
)
5075 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5076 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
5079 // normalise radius_authtypes_s
5080 if (config
->radius_authprefer
== AUTHPAP
)
5082 strcpy(config
->radius_authtypes_s
, "pap");
5083 if (config
->radius_authtypes
& AUTHCHAP
)
5084 strcat(config
->radius_authtypes_s
, ", chap");
5088 strcpy(config
->radius_authtypes_s
, "chap");
5089 if (config
->radius_authtypes
& AUTHPAP
)
5090 strcat(config
->radius_authtypes_s
, ", pap");
5093 if (!config
->radius_dae_port
)
5094 config
->radius_dae_port
= DAEPORT
;
5096 // re-initialise the random number source
5097 initrandom(config
->random_device
);
5100 for (i
= 0; i
< MAXPLUGINS
; i
++)
5102 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
5105 if (*config
->plugins
[i
])
5108 add_plugin(config
->plugins
[i
]);
5110 else if (*config
->old_plugins
[i
])
5113 remove_plugin(config
->old_plugins
[i
]);
5118 guest_accounts_num
= 0;
5119 char *p2
= config
->guest_user
;
5122 char *s
= strpbrk(p2
, " \t,");
5126 while (*s
== ' ' || *s
== '\t')
5133 strcpy(guest_users
[guest_accounts_num
], p2
);
5134 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num
, guest_users
[guest_accounts_num
]);
5135 guest_accounts_num
++;
5138 // Rebuild the guest_user array
5139 strcpy(config
->guest_user
, "");
5141 for (ui
=0; ui
<guest_accounts_num
; ui
++)
5143 strcat(config
->guest_user
, guest_users
[ui
]);
5144 if (ui
<guest_accounts_num
-1)
5146 strcat(config
->guest_user
, ",");
5151 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
5152 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
5153 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
5154 if (!*config
->cluster_interface
)
5155 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
5157 if (!config
->cluster_hb_interval
)
5158 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
5160 if (!config
->cluster_hb_timeout
)
5161 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
5163 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
5165 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5166 // late, ensure we're sufficiently larger than that
5167 int t
= 4 * config
->cluster_hb_interval
+ 11;
5169 if (config
->cluster_hb_timeout
< t
)
5171 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
5172 config
->cluster_hb_timeout
= t
;
5175 // Push timing changes to the slaves immediately if we're the master
5176 if (config
->cluster_iam_master
)
5177 cluster_heartbeat();
5179 interval
= config
->cluster_hb_interval
;
5180 timeout
= config
->cluster_hb_timeout
;
5184 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
5187 if ((f
= fopen(config
->pid_file
, "w")))
5189 fprintf(f
, "%d\n", getpid());
5191 config
->wrote_pid
= 1;
5195 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
5200 static void read_config_file()
5204 if (!config
->config_file
) return;
5205 if (!(f
= fopen(config
->config_file
, "r")))
5207 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
5211 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
5213 LOG(3, 0, 0, "Done reading config file\n");
5217 int sessionsetup(sessionidt s
, tunnelidt t
)
5219 // A session now exists, set it up
5225 CSTAT(sessionsetup
);
5227 LOG(3, s
, t
, "Doing session setup for session\n");
5229 // Join a bundle if the MRRU option is accepted
5230 if(session
[s
].mrru
> 0 && session
[s
].bundle
== 0)
5232 LOG(3, s
, t
, "This session can be part of multilink bundle\n");
5233 if (join_bundle(s
) > 0)
5234 cluster_send_bundle(session
[s
].bundle
);
5237 LOG(0, s
, t
, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5238 sessionshutdown(s
, "Mismaching mssf option.", CDN_NONE
, TERM_SERVICE_UNAVAILABLE
);
5245 assign_ip_address(s
);
5248 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
5249 sessionshutdown(s
, "No IP addresses available.", CDN_TRY_ANOTHER
, TERM_SERVICE_UNAVAILABLE
);
5252 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
5253 fmtaddr(htonl(session
[s
].ip
), 0));
5256 // Make sure this is right
5257 session
[s
].tunnel
= t
;
5259 // zap old sessions with same IP and/or username
5260 // Don't kill gardened sessions - doing so leads to a DoS
5261 // from someone who doesn't need to know the password
5264 user
= session
[s
].user
;
5265 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
5267 if (i
== s
) continue;
5268 if (!session
[s
].opened
) break;
5269 // Allow duplicate sessions for multilink ones of the same bundle.
5270 if (session
[s
].bundle
&& session
[i
].bundle
&& session
[s
].bundle
== session
[i
].bundle
) continue;
5272 if (ip
== session
[i
].ip
)
5274 sessionkill(i
, "Duplicate IP address");
5275 cluster_listinvert_session(s
, i
);
5279 if (config
->allow_duplicate_users
) continue;
5280 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
5284 for (gu
= 0; gu
< guest_accounts_num
; gu
++)
5286 if (!strcasecmp(user
, guest_users
[gu
]))
5292 if (found
) continue;
5294 // Drop the new session in case of duplicate sessionss, not the old one.
5295 if (!strcasecmp(user
, session
[i
].user
))
5296 sessionkill(i
, "Duplicate session for users");
5300 // no need to set a route for the same IP address of the bundle
5301 if (!session
[s
].bundle
|| (bundle
[session
[s
].bundle
].num_of_links
== 1))
5305 // Add the route for this session.
5306 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
5308 if ((session
[s
].ip
>> (32-session
[s
].route
[r
].prefixlen
)) ==
5309 (session
[s
].route
[r
].ip
>> (32-session
[s
].route
[r
].prefixlen
)))
5312 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].prefixlen
, 0, 1);
5315 // Static IPs need to be routed if not already
5316 // convered by a Framed-Route. Anything else is part
5317 // of the IP address pool and is already routed, it
5318 // just needs to be added to the IP cache.
5319 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5320 if (session
[s
].ip_pool_index
== -1) // static ip
5322 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
5325 cache_ipmap(session
[s
].ip
, s
);
5328 sess_local
[s
].lcp_authtype
= 0; // RADIUS authentication complete
5329 lcp_open(s
, t
); // transition to Network phase and send initial IPCP
5331 // Run the plugin's against this new session.
5333 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
5334 run_plugins(PLUGIN_NEW_SESSION
, &data
);
5337 // Allocate TBFs if throttled
5338 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
5339 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
5341 session
[s
].last_packet
= session
[s
].last_data
= time_now
;
5343 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
5344 fmtaddr(htonl(session
[s
].ip
), 0),
5345 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
5347 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
5349 return 1; // RADIUS OK and IP allocated, done...
5353 // This session just got dropped on us by the master or something.
5354 // Make sure our tables up up to date...
5356 int load_session(sessionidt s
, sessiont
*new)
5362 if (new->ip_pool_index
>= MAXIPPOOL
||
5363 new->tunnel
>= MAXTUNNEL
)
5365 LOG(0, s
, 0, "Strange session update received!\n");
5366 // FIXME! What to do here?
5371 // Ok. All sanity checks passed. Now we're committed to
5372 // loading the new session.
5375 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
5377 // See if routes/ip cache need updating
5378 if (new->ip
!= session
[s
].ip
)
5381 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
5382 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
5383 new->route
[i
].prefixlen
!= session
[s
].route
[i
].prefixlen
)
5391 // remove old routes...
5392 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
5394 if ((session
[s
].ip
>> (32-session
[s
].route
[i
].prefixlen
)) ==
5395 (session
[s
].route
[i
].ip
>> (32-session
[s
].route
[i
].prefixlen
)))
5398 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].prefixlen
, 0, 0);
5404 if (session
[s
].ip_pool_index
== -1) // static IP
5406 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
5408 else // It's part of the IP pool, remove it manually.
5409 uncache_ipmap(session
[s
].ip
);
5414 // add new routes...
5415 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
5417 if ((new->ip
>> (32-new->route
[i
].prefixlen
)) ==
5418 (new->route
[i
].ip
>> (32-new->route
[i
].prefixlen
)))
5421 routeset(s
, new->route
[i
].ip
, new->route
[i
].prefixlen
, 0, 1);
5427 // If there's a new one, add it.
5428 if (new->ip_pool_index
== -1)
5430 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
5433 cache_ipmap(new->ip
, s
);
5438 if (new->ipv6prefixlen
&& new->ppp
.ipv6cp
== Opened
&& session
[s
].ppp
.ipv6cp
!= Opened
)
5439 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
5442 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
5444 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %u\n", (int) new->filter_in
);
5448 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
5450 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %u\n", (int) new->filter_out
);
5451 new->filter_out
= 0;
5454 if (new->filter_in
!= session
[s
].filter_in
)
5456 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
5457 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
5460 if (new->filter_out
!= session
[s
].filter_out
)
5462 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
5463 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
5466 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
5467 // for walking the sessions to forward byte counts to the master.
5468 config
->cluster_highest_sessionid
= s
;
5470 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
5472 // Do fixups into address pool.
5473 if (new->ip_pool_index
!= -1)
5474 fix_address_pool(s
);
5479 static void initplugins()
5483 loaded_plugins
= ll_init();
5484 // Initialize the plugins to nothing
5485 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
5486 plugins
[i
] = ll_init();
5489 static void *open_plugin(char *plugin_name
, int load
)
5491 char path
[256] = "";
5493 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
5494 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
5495 return dlopen(path
, RTLD_NOW
);
5498 // plugin callback to get a config value
5499 static void *getconfig(char *key
, enum config_typet type
)
5503 for (i
= 0; config_values
[i
].key
; i
++)
5505 if (!strcmp(config_values
[i
].key
, key
))
5507 if (config_values
[i
].type
== type
)
5508 return ((void *) config
) + config_values
[i
].offset
;
5510 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5511 key
, type
, config_values
[i
].type
);
5517 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
5521 static int add_plugin(char *plugin_name
)
5523 static struct pluginfuncs funcs
= {
5528 sessiontbysessionidt
,
5529 sessionidtbysessiont
,
5536 cluster_send_session
,
5539 void *p
= open_plugin(plugin_name
, 1);
5540 int (*initfunc
)(struct pluginfuncs
*);
5545 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5549 if (ll_contains(loaded_plugins
, p
))
5552 return 0; // already loaded
5556 int *v
= dlsym(p
, "plugin_api_version");
5557 if (!v
|| *v
!= PLUGIN_API_VERSION
)
5559 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5565 if ((initfunc
= dlsym(p
, "plugin_init")))
5567 if (!initfunc(&funcs
))
5569 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5575 ll_push(loaded_plugins
, p
);
5577 for (i
= 0; i
< max_plugin_functions
; i
++)
5580 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5582 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
5583 ll_push(plugins
[i
], x
);
5587 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
5591 static void run_plugin_done(void *plugin
)
5593 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
5599 static int remove_plugin(char *plugin_name
)
5601 void *p
= open_plugin(plugin_name
, 0);
5607 if (ll_contains(loaded_plugins
, p
))
5610 for (i
= 0; i
< max_plugin_functions
; i
++)
5613 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
5614 ll_delete(plugins
[i
], x
);
5617 ll_delete(loaded_plugins
, p
);
5623 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
5627 int run_plugins(int plugin_type
, void *data
)
5629 int (*func
)(void *data
);
5631 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
5632 return PLUGIN_RET_ERROR
;
5634 ll_reset(plugins
[plugin_type
]);
5635 while ((func
= ll_next(plugins
[plugin_type
])))
5639 if (r
!= PLUGIN_RET_OK
)
5640 return r
; // stop here
5643 return PLUGIN_RET_OK
;
5646 static void plugins_done()
5650 ll_reset(loaded_plugins
);
5651 while ((p
= ll_next(loaded_plugins
)))
5655 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
, struct in_addr
*local
)
5657 struct nsctl request
;
5658 struct nsctl response
;
5659 int type
= unpack_control(&request
, buf
, len
);
5663 if (log_stream
&& config
->debug
>= 4)
5667 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5668 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
5672 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5673 dump_control(&request
, log_stream
);
5679 case NSCTL_REQ_LOAD
:
5680 if (request
.argc
!= 1)
5682 response
.type
= NSCTL_RES_ERR
;
5684 response
.argv
[0] = "name of plugin required";
5686 else if ((r
= add_plugin(request
.argv
[0])) < 1)
5688 response
.type
= NSCTL_RES_ERR
;
5690 response
.argv
[0] = !r
5691 ? "plugin already loaded"
5692 : "error loading plugin";
5696 response
.type
= NSCTL_RES_OK
;
5702 case NSCTL_REQ_UNLOAD
:
5703 if (request
.argc
!= 1)
5705 response
.type
= NSCTL_RES_ERR
;
5707 response
.argv
[0] = "name of plugin required";
5709 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
5711 response
.type
= NSCTL_RES_ERR
;
5713 response
.argv
[0] = !r
5714 ? "plugin not loaded"
5715 : "plugin not found";
5719 response
.type
= NSCTL_RES_OK
;
5725 case NSCTL_REQ_HELP
:
5726 response
.type
= NSCTL_RES_OK
;
5729 ll_reset(loaded_plugins
);
5730 while ((p
= ll_next(loaded_plugins
)))
5732 char **help
= dlsym(p
, "plugin_control_help");
5733 while (response
.argc
< 0xff && help
&& *help
)
5734 response
.argv
[response
.argc
++] = *help
++;
5739 case NSCTL_REQ_CONTROL
:
5741 struct param_control param
= {
5742 config
->cluster_iam_master
,
5749 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
5751 if (r
== PLUGIN_RET_ERROR
)
5753 response
.type
= NSCTL_RES_ERR
;
5755 response
.argv
[0] = param
.additional
5757 : "error returned by plugin";
5759 else if (r
== PLUGIN_RET_NOTMASTER
)
5761 static char msg
[] = "must be run on master: 000.000.000.000";
5763 response
.type
= NSCTL_RES_ERR
;
5765 if (config
->cluster_master_address
)
5767 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
5768 response
.argv
[0] = msg
;
5772 response
.argv
[0] = "must be run on master: none elected";
5775 else if (!(param
.response
& NSCTL_RESPONSE
))
5777 response
.type
= NSCTL_RES_ERR
;
5779 response
.argv
[0] = param
.response
5780 ? "unrecognised response value from plugin"
5781 : "unhandled action";
5785 response
.type
= param
.response
;
5787 if (param
.additional
)
5790 response
.argv
[0] = param
.additional
;
5798 response
.type
= NSCTL_RES_ERR
;
5800 response
.argv
[0] = "error unpacking control packet";
5803 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
5806 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5810 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
5813 sendtofrom(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
, local
);
5814 if (log_stream
&& config
->debug
>= 4)
5816 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
5817 dump_control(&response
, log_stream
);
5821 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
5822 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
5827 static tunnelidt
new_tunnel()
5830 for (i
= 1; i
< MAXTUNNEL
; i
++)
5832 if (tunnel
[i
].state
== TUNNELFREE
)
5834 LOG(4, 0, i
, "Assigning tunnel ID %u\n", i
);
5835 if (i
> config
->cluster_highest_tunnelid
)
5836 config
->cluster_highest_tunnelid
= i
;
5840 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
5845 // We're becoming the master. Do any required setup..
5847 // This is principally telling all the plugins that we're
5848 // now a master, and telling them about all the sessions
5849 // that are active too..
5851 void become_master(void)
5854 static struct event_data d
[RADIUS_FDS
];
5855 struct epoll_event e
;
5857 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
5859 // running a bunch of iptables commands is slow and can cause
5860 // the master to drop tunnels on takeover--kludge around the
5861 // problem by forking for the moment (note: race)
5862 if (!fork_and_close())
5864 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5866 if (!session
[s
].opened
) // Not an in-use session.
5869 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
5876 for (i
= 0; i
< RADIUS_FDS
; i
++)
5878 d
[i
].type
= FD_TYPE_RADIUS
;
5882 epoll_ctl(epollfd
, EPOLL_CTL_ADD
, radfds
[i
], &e
);
5886 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5892 if (CLI_HELP_REQUESTED
)
5893 return CLI_HELP_NO_ARGS
;
5896 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5898 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5901 if (!session
[s
].opened
)
5904 idle
= time_now
- session
[s
].last_data
;
5905 idle
/= 5 ; // In multiples of 5 seconds.
5915 for (i
= 0; i
< 63; ++i
)
5917 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5919 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
5920 cli_print(cli
, "%d total sessions open.", count
);
5924 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
5930 if (CLI_HELP_REQUESTED
)
5931 return CLI_HELP_NO_ARGS
;
5934 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
5936 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
5939 if (!session
[s
].opened
)
5942 d
= time_now
- session
[s
].opened
;
5945 while (d
> 1 && open
< 32)
5955 for (i
= 0; i
< 30; ++i
)
5957 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
5960 cli_print(cli
, "%d total sessions open.", count
);
5966 * This unencodes the AVP using the L2TP secret and the previously
5967 * stored random vector. It overwrites the hidden data with the
5968 * unhidden AVP subformat.
5970 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
5976 uint16_t m
= htons(type
);
5978 // Compute initial pad
5980 MD5_Update(&ctx
, (unsigned char *) &m
, 2);
5981 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5982 MD5_Update(&ctx
, vector
, vec_len
);
5983 MD5_Final(digest
, &ctx
);
5985 // pointer to last decoded 16 octets
5990 // calculate a new pad based on the last decoded block
5991 if (d
>= sizeof(digest
))
5994 MD5_Update(&ctx
, config
->l2tp_secret
, strlen(config
->l2tp_secret
));
5995 MD5_Update(&ctx
, last
, sizeof(digest
));
5996 MD5_Final(digest
, &ctx
);
6002 *value
++ ^= digest
[d
++];
6007 int find_filter(char const *name
, size_t len
)
6012 for (i
= 0; i
< MAXFILTER
; i
++)
6014 if (!*ip_filters
[i
].name
)
6022 if (strlen(ip_filters
[i
].name
) != len
)
6025 if (!strncmp(ip_filters
[i
].name
, name
, len
))
6032 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
6036 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
6037 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
6038 case FILTER_PORT_OP_GT
: return port
> p
->port
;
6039 case FILTER_PORT_OP_LT
: return port
< p
->port
;
6040 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
6046 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
6050 case FILTER_FLAG_OP_ANY
:
6051 return (flags
& sflags
) || (~flags
& cflags
);
6053 case FILTER_FLAG_OP_ALL
:
6054 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
6056 case FILTER_FLAG_OP_EST
:
6057 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
6063 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
6065 uint16_t frag_offset
;
6069 uint16_t src_port
= 0;
6070 uint16_t dst_port
= 0;
6072 ip_filter_rulet
*rule
;
6074 if (len
< 20) // up to end of destination address
6077 if ((*buf
>> 4) != 4) // IPv4
6080 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
6082 src_ip
= *(in_addr_t
*) (buf
+ 12);
6083 dst_ip
= *(in_addr_t
*) (buf
+ 16);
6085 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
6087 int l
= (buf
[0] & 0xf) * 4; // length of IP header
6088 if (len
< l
+ 4) // ports
6091 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
6092 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
6093 if (proto
== IPPROTO_TCP
)
6095 if (len
< l
+ 14) // flags
6098 flags
= buf
[l
+ 13] & 0x3f;
6102 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
6104 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
6107 if (rule
->src_wild
!= INADDR_BROADCAST
&&
6108 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
6111 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
6112 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
6117 // layer 4 deny rules are skipped
6118 if (rule
->action
== FILTER_ACTION_DENY
&&
6119 (rule
->src_ports
.op
|| rule
->dst_ports
.op
|| rule
->tcp_flag_op
))
6127 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
6129 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
6132 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
6135 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
6136 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
6143 return rule
->action
== FILTER_ACTION_PERMIT
;