3 // Copyright (c) 2003, 2004, 2005 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
7 char const *cvs_id_l2tpns
= "$Id: l2tpns.c,v 1.106 2005/06/02 04:04:07 bodea Exp $";
13 #include <linux/if_tun.h>
18 #include <net/route.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
32 #include <sys/resource.h>
40 #include <sys/sysinfo.h>
48 #include "constants.h"
58 configt
*config
= NULL
; // all configuration
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 snoopfd
= -1; // UDP file handle for sending out intercept data
64 int *radfds
= NULL
; // RADIUS requests file handles
65 int ifrfd
= -1; // File descriptor for routing, etc
66 int ifr6fd
= -1; // File descriptor for IPv6 routing, etc
67 static int rand_fd
= -1; // Random data source
68 time_t basetime
= 0; // base clock
69 char hostname
[1000] = ""; // us.
70 static int tunidx
; // ifr_ifindex of tun device
71 static int syslog_log
= 0; // are we logging to syslog
72 static FILE *log_stream
= 0; // file handle for direct logging (i.e. direct into file, not via syslog).
73 extern int cluster_sockfd
; // Intra-cluster communications socket.
74 uint32_t last_id
= 0; // Unique ID for radius accounting
76 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
77 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
79 static void *ip_hash
[256]; // Mapping from IP address to session structures.
82 struct ipv6radix
*branch
;
83 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
86 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
87 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
90 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
91 time_t time_now
= 0; // Current time in seconds since epoch.
92 static char time_now_string
[64] = {0}; // Current time as a string.
93 static char main_quit
= 0; // True if we're in the process of exiting.
94 linked_list
*loaded_plugins
;
95 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
97 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
98 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
100 config_descriptt config_values
[] = {
101 CONFIG("debug", debug
, INT
),
102 CONFIG("log_file", log_filename
, STRING
),
103 CONFIG("pid_file", pid_file
, STRING
),
104 CONFIG("random_device", random_device
, STRING
),
105 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
106 CONFIG("primary_dns", default_dns1
, IPv4
),
107 CONFIG("secondary_dns", default_dns2
, IPv4
),
108 CONFIG("primary_radius", radiusserver
[0], IPv4
),
109 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
110 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
111 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
112 CONFIG("radius_accounting", radius_accounting
, BOOL
),
113 CONFIG("radius_interim", radius_interim
, INT
),
114 CONFIG("radius_secret", radiussecret
, STRING
),
115 CONFIG("radius_authtypes", radius_authtypes_s
, STRING
),
116 CONFIG("allow_duplicate_users", allow_duplicate_users
, BOOL
),
117 CONFIG("bind_address", bind_address
, IPv4
),
118 CONFIG("peer_address", peer_address
, IPv4
),
119 CONFIG("send_garp", send_garp
, BOOL
),
120 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
121 CONFIG("throttle_buckets", num_tbfs
, INT
),
122 CONFIG("accounting_dir", accounting_dir
, STRING
),
123 CONFIG("setuid", target_uid
, INT
),
124 CONFIG("dump_speed", dump_speed
, BOOL
),
125 CONFIG("cleanup_interval", cleanup_interval
, INT
),
126 CONFIG("multi_read_count", multi_read_count
, INT
),
127 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
128 CONFIG("lock_pages", lock_pages
, BOOL
),
129 CONFIG("icmp_rate", icmp_rate
, INT
),
130 CONFIG("packet_limit", max_packets
, INT
),
131 CONFIG("cluster_address", cluster_address
, IPv4
),
132 CONFIG("cluster_interface", cluster_interface
, STRING
),
133 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
134 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
135 CONFIG("cluster_master_min_adv", cluster_master_min_adv
, INT
),
136 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
140 static char *plugin_functions
[] = {
147 "plugin_new_session",
148 "plugin_kill_session",
150 "plugin_radius_response",
151 "plugin_become_master",
152 "plugin_new_session_master",
155 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
157 // Counters for shutdown sessions
158 static sessiont shut_acct
[8192];
159 static sessionidt shut_acct_n
= 0;
161 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
162 sessiont
*session
= NULL
; // Array of session structures.
163 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
164 radiust
*radius
= NULL
; // Array of radius structures.
165 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
166 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
167 static controlt
*controlfree
= 0;
168 struct Tstats
*_statistics
= NULL
;
170 struct Tringbuffer
*ringbuffer
= NULL
;
173 static void cache_ipmap(in_addr_t ip
, int s
);
174 static void uncache_ipmap(in_addr_t ip
);
175 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
176 static void free_ip_address(sessionidt s
);
177 static void dump_acct_info(int all
);
178 static void sighup_handler(int sig
);
179 static void sigalrm_handler(int sig
);
180 static void sigterm_handler(int sig
);
181 static void sigquit_handler(int sig
);
182 static void sigchild_handler(int sig
);
183 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
);
184 static void update_config(void);
185 static void read_config_file(void);
186 static void initplugins(void);
187 static int add_plugin(char *plugin_name
);
188 static int remove_plugin(char *plugin_name
);
189 static void plugins_done(void);
190 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
191 static tunnelidt
new_tunnel(void);
192 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
194 // return internal time (10ths since process startup)
195 static clockt
now(void)
199 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
202 // work out a retry time based on try number
203 // This is a straight bounded exponential backoff.
204 // Maximum re-try time is 32 seconds. (2^5).
205 clockt
backoff(uint8_t try)
207 if (try > 5) try = 5; // max backoff
208 return now() + 10 * (1 << try);
213 // Log a debug message. Typically called via the LOG macro
215 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
217 static char message
[65536] = {0};
223 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
224 ringbuffer
->tail
= 0;
225 if (ringbuffer
->tail
== ringbuffer
->head
)
226 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
227 ringbuffer
->head
= 0;
229 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
230 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
231 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
232 va_start(ap
, format
);
233 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
238 if (config
->debug
< level
) return;
240 va_start(ap
, format
);
241 vsnprintf(message
, sizeof(message
), format
, ap
);
244 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
246 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
251 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
254 const uint8_t *d
= (const uint8_t *) data
;
256 if (config
->debug
< level
) return;
258 // No support for _log_hex to syslog
261 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
262 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
264 for (i
= 0; i
< maxsize
; )
266 fprintf(log_stream
, "%4X: ", i
);
267 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
269 fprintf(log_stream
, "%02X ", d
[j
]);
271 fputs(": ", log_stream
);
274 for (; j
< i
+ 16; j
++)
276 fputs(" ", log_stream
);
278 fputs(": ", log_stream
);
281 fputs(" ", log_stream
);
282 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
284 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
285 fputc(d
[j
], log_stream
);
287 fputc('.', log_stream
);
290 fputs(" ", log_stream
);
294 fputs("\n", log_stream
);
298 setbuf(log_stream
, NULL
);
302 // initialise the random generator
303 static void initrandom(char *source
)
305 static char path
[sizeof(config
->random_device
)] = "*undefined*";
307 // reinitialise only if we are forced to do so or if the config has changed
308 if (source
&& !strncmp(path
, source
, sizeof(path
)))
311 // close previous source, if any
312 if (rand_fd
>= 0) close(rand_fd
);
319 snprintf(path
, sizeof(path
), "%s", source
);
323 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
325 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
326 path
, strerror(errno
));
330 // no source: seed prng
332 unsigned seed
= time_now
^ getpid();
333 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
338 // fill buffer with random data
339 void random_data(uint8_t *buf
, int len
)
346 n
= read(rand_fd
, buf
, len
);
347 if (n
>= len
) return;
352 LOG(0, 0, 0, "Error reading from random source: %s\n",
355 // fall back to rand()
363 // append missing data
365 // not using the low order bits from the prng stream
366 buf
[n
++] = (rand() >> 4) & 0xff;
371 // This adds it to the routing table, advertises it
372 // via BGP if enabled, and stuffs it into the
373 // 'sessionbyip' cache.
375 // 'ip' and 'mask' must be in _host_ order.
377 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
382 if (!mask
) mask
= 0xffffffff;
384 ip
&= mask
; // Force the ip to be the first one in the route.
386 memset(&r
, 0, sizeof(r
));
387 r
.rt_dev
= config
->tundevice
;
388 r
.rt_dst
.sa_family
= AF_INET
;
389 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
390 r
.rt_gateway
.sa_family
= AF_INET
;
391 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
392 r
.rt_genmask
.sa_family
= AF_INET
;
393 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
394 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
396 r
.rt_flags
|= RTF_GATEWAY
;
397 else if (mask
== 0xffffffff)
398 r
.rt_flags
|= RTF_HOST
;
400 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
401 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
402 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
404 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
405 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
409 bgp_add_route(htonl(ip
), htonl(mask
));
411 bgp_del_route(htonl(ip
), htonl(mask
));
414 // Add/Remove the IPs to the 'sessionbyip' cache.
415 // Note that we add the zero address in the case of
416 // a network route. Roll on CIDR.
418 // Note that 's == 0' implies this is the address pool.
419 // We still cache it here, because it will pre-fill
420 // the malloc'ed tree.
424 if (!add
) // Are we deleting a route?
425 s
= 0; // Caching the session as '0' is the same as uncaching.
427 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
432 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
435 char ipv6addr
[INET6_ADDRSTRLEN
];
439 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
443 memset(&rt
, 0, sizeof(rt
));
445 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
446 rt
.rtmsg_dst_len
= prefixlen
;
448 rt
.rtmsg_flags
= RTF_UP
;
449 rt
.rtmsg_ifindex
= tunidx
;
451 LOG(1, 0, 0, "Route %s %s/%d\n",
453 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
456 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
457 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
460 // FIXME: need to add BGP routing (RFC2858)
464 if (!add
) // Are we deleting a route?
465 s
= 0; // Caching the session as '0' is the same as uncaching.
467 cache_ipv6map(ip
, prefixlen
, s
);
473 // defined in linux/ipv6.h, but tricky to include from user-space
474 // TODO: move routing to use netlink rather than ioctl
476 struct in6_addr ifr6_addr
;
477 __u32 ifr6_prefixlen
;
478 unsigned int ifr6_ifindex
;
482 // Set up TUN interface
483 static void inittun(void)
486 struct in6_ifreq ifr6
;
487 struct sockaddr_in sin
= {0};
488 memset(&ifr
, 0, sizeof(ifr
));
489 ifr
.ifr_flags
= IFF_TUN
;
491 tunfd
= open(TUNDEVICE
, O_RDWR
);
494 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
498 int flags
= fcntl(tunfd
, F_GETFL
, 0);
499 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
501 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
503 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
506 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
507 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
508 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
510 sin
.sin_family
= AF_INET
;
511 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
512 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
514 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
516 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
519 /* Bump up the qlen to deal with bursts from the network */
521 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
523 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
526 ifr
.ifr_flags
= IFF_UP
;
527 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
529 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
532 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
534 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
537 tunidx
= ifr
.ifr_ifindex
;
539 // Only setup IPv6 on the tun device if we have a configured prefix
540 if (config
->ipv6_prefix
.s6_addr
[0] > 0) {
541 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
543 // Link local address is FE80::1
544 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
545 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
546 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
547 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
548 ifr6
.ifr6_prefixlen
= 64;
549 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
550 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
552 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
553 " %s\n", strerror(errno
));
556 // Global address is prefix::1
557 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
558 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
559 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
560 ifr6
.ifr6_prefixlen
= 64;
561 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
562 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
564 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
571 static void initudp(void)
574 struct sockaddr_in addr
;
577 memset(&addr
, 0, sizeof(addr
));
578 addr
.sin_family
= AF_INET
;
579 addr
.sin_port
= htons(L2TPPORT
);
580 addr
.sin_addr
.s_addr
= config
->bind_address
;
581 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
582 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
584 int flags
= fcntl(udpfd
, F_GETFL
, 0);
585 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
587 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
589 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
592 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
595 memset(&addr
, 0, sizeof(addr
));
596 addr
.sin_family
= AF_INET
;
597 addr
.sin_port
= htons(NSCTL_PORT
);
598 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
599 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
600 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
602 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
608 // Find session by IP, < 1 for not found
610 // Confusingly enough, this 'ip' must be
611 // in _network_ order. This being the common
612 // case when looking it up from IP packet headers.
614 // We actually use this cache for two things.
615 // #1. For used IP addresses, this maps to the
616 // session ID that it's used by.
617 // #2. For un-used IP addresses, this maps to the
618 // index into the pool table that contains that
622 static int lookup_ipmap(in_addr_t ip
)
624 uint8_t *a
= (uint8_t *) &ip
;
625 uint8_t **d
= (uint8_t **) ip_hash
;
627 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
628 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
629 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
631 return (int) (intptr_t) d
[(size_t) *a
];
634 static int lookup_ipv6map(struct in6_addr ip
)
636 struct ipv6radix
*curnode
;
639 char ipv6addr
[INET6_ADDRSTRLEN
];
641 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
645 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
647 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
652 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
653 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
660 sessionidt
sessionbyip(in_addr_t ip
)
662 int s
= lookup_ipmap(ip
);
665 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
666 return (sessionidt
) s
;
671 sessionidt
sessionbyipv6(struct in6_addr ip
)
674 CSTAT(sessionbyipv6
);
676 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
677 (ip
.s6_addr
[0] == 0xFE && ip
.s6_addr
[1] == 0x80 &&
678 (ip
.s6_addr16
[1] == ip
.s6_addr16
[2] == ip
.s6_addr16
[3] == 0))) {
679 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
681 s
= lookup_ipv6map(ip
);
684 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
691 // Take an IP address in HOST byte order and
692 // add it to the sessionid by IP cache.
694 // (It's actually cached in network order)
696 static void cache_ipmap(in_addr_t ip
, int s
)
698 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
699 uint8_t *a
= (uint8_t *) &nip
;
700 uint8_t **d
= (uint8_t **) ip_hash
;
703 for (i
= 0; i
< 3; i
++)
705 if (!d
[(size_t) a
[i
]])
707 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
711 d
= (uint8_t **) d
[(size_t) a
[i
]];
714 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
717 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
720 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
721 // else a map to an ip pool index.
724 static void uncache_ipmap(in_addr_t ip
)
726 cache_ipmap(ip
, 0); // Assign it to the NULL session.
729 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
733 struct ipv6radix
*curnode
;
734 char ipv6addr
[INET6_ADDRSTRLEN
];
736 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
738 bytes
= prefixlen
>> 3;
741 if (curnode
->branch
== NULL
)
743 if (!(curnode
->branch
= calloc(256,
744 sizeof (struct ipv6radix
))))
747 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
754 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
755 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
759 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
760 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
766 // CLI list to dump current ipcache.
768 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
770 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
774 if (CLI_HELP_REQUESTED
)
775 return CLI_HELP_NO_ARGS
;
777 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
779 for (i
= 0; i
< 256; ++i
)
784 for (j
= 0; j
< 256; ++j
)
789 for (k
= 0; k
< 256; ++k
)
794 for (l
= 0; l
< 256; ++l
)
798 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
804 cli_print(cli
, "%d entries in cache", count
);
809 // Find session by username, 0 for not found
810 // walled garden users aren't authenticated, so the username is
811 // reasonably useless. Ignore them to avoid incorrect actions
813 // This is VERY inefficent. Don't call it often. :)
815 sessionidt
sessionbyuser(char *username
)
818 CSTAT(sessionbyuser
);
820 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
822 if (!session
[s
].opened
)
825 if (session
[s
].walled_garden
)
826 continue; // Skip walled garden users.
828 if (!strncmp(session
[s
].user
, username
, 128))
832 return 0; // Not found.
835 void send_garp(in_addr_t ip
)
841 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
844 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
847 memset(&ifr
, 0, sizeof(ifr
));
848 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
849 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
851 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
855 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
856 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
858 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
863 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
866 static sessiont
*sessiontbysessionidt(sessionidt s
)
868 if (!s
|| s
>= MAXSESSION
) return NULL
;
872 static sessionidt
sessionidtbysessiont(sessiont
*s
)
874 sessionidt val
= s
-session
;
875 if (s
< session
|| val
>= MAXSESSION
) return 0;
879 // actually send a control message for a specific tunnel
880 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
882 struct sockaddr_in addr
;
888 static int backtrace_count
= 0;
889 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
890 STAT(tunnel_tx_errors
);
891 log_backtrace(backtrace_count
, 5)
897 static int backtrace_count
= 0;
898 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
899 log_backtrace(backtrace_count
, 5)
900 STAT(tunnel_tx_errors
);
904 memset(&addr
, 0, sizeof(addr
));
905 addr
.sin_family
= AF_INET
;
906 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
907 addr
.sin_port
= htons(tunnel
[t
].port
);
909 // sequence expected, if sequence in message
910 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
912 // If this is a control message, deal with retries
915 tunnel
[t
].last
= time_now
; // control message sent
916 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
917 if (tunnel
[t
].try > 1)
919 STAT(tunnel_retries
);
920 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
924 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
926 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
927 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
928 STAT(tunnel_tx_errors
);
932 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
933 STAT(tunnel_tx_packets
);
934 INC_STAT(tunnel_tx_bytes
, l
);
938 // Tiny helper function to write data to
941 int tun_write(uint8_t * data
, int size
)
943 return write(tunfd
, data
, size
);
946 // process outgoing (to tunnel) IP
948 static void processipout(uint8_t * buf
, int len
)
955 char *data
= buf
; // Keep a copy of the originals.
958 uint8_t b
[MAXETHER
+ 20];
962 if (len
< MIN_IP_SIZE
)
964 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
970 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
975 // Skip the tun header
979 // Got an IP header now
980 if (*(uint8_t *)(buf
) >> 4 != 4)
982 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
986 ip
= *(uint32_t *)(buf
+ 16);
987 if (!(s
= sessionbyip(ip
)))
989 // Is this a packet for a session that doesn't exist?
990 static int rate
= 0; // Number of ICMP packets we've sent this second.
991 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
993 if (last
!= time_now
)
999 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1001 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1002 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4), ip
, buf
, (len
< 64) ? 64 : len
);
1006 t
= session
[s
].tunnel
;
1009 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1010 if (config
->max_packets
> 0)
1012 if (sess_local
[s
].last_packet_out
== TIME
)
1014 int max
= config
->max_packets
;
1016 // All packets for throttled sessions are handled by the
1017 // master, so further limit by using the throttle rate.
1018 // A bit of a kludge, since throttle rate is in kbps,
1019 // but should still be generous given our average DSL
1020 // packet size is 200 bytes: a limit of 28kbps equates
1021 // to around 180 packets per second.
1022 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1023 max
= sp
->throttle_out
;
1025 if (++sess_local
[s
].packets_out
> max
)
1027 sess_local
[s
].packets_dropped
++;
1033 if (sess_local
[s
].packets_dropped
)
1035 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1036 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1037 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1038 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1042 sess_local
[s
].last_packet_out
= TIME
;
1043 sess_local
[s
].packets_out
= 1;
1044 sess_local
[s
].packets_dropped
= 0;
1048 // run access-list if any
1049 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1054 // Are we throttling this session?
1055 if (config
->cluster_iam_master
)
1056 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1058 master_throttle_packet(sp
->tbf_out
, data
, size
);
1061 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1063 // We are walled-gardening this
1064 master_garden_packet(s
, data
, size
);
1068 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1070 // Add on L2TP header
1072 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1074 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1077 // Snooping this session, send it to intercept box
1078 if (sp
->snoop_ip
&& sp
->snoop_port
)
1079 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1081 sp
->cout
+= len
; // byte count
1082 sp
->total_cout
+= len
; // byte count
1085 sess_local
[s
].cout
+= len
; // To send to master..
1088 // process outgoing (to tunnel) IPv6
1090 static void processipv6out(uint8_t * buf
, int len
)
1096 struct in6_addr ip6
;
1098 char *data
= buf
; // Keep a copy of the originals.
1101 uint8_t b
[MAXETHER
+ 20];
1103 CSTAT(processipv6out
);
1105 if (len
< MIN_IP_SIZE
)
1107 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1108 STAT(tunnel_tx_errors
);
1111 if (len
>= MAXETHER
)
1113 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1114 STAT(tunnel_tx_errors
);
1118 // Skip the tun header
1122 // Got an IP header now
1123 if (*(uint8_t *)(buf
) >> 4 != 6)
1125 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1129 ip6
= *(struct in6_addr
*)(buf
+24);
1130 s
= sessionbyipv6(ip6
);
1134 ip
= *(uint32_t *)(buf
+ 32);
1135 s
= sessionbyip(ip
);
1140 // Is this a packet for a session that doesn't exist?
1141 static int rate
= 0; // Number of ICMP packets we've sent this second.
1142 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1144 if (last
!= time_now
)
1150 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1152 // FIXME: Should send icmp6 host unreachable
1156 t
= session
[s
].tunnel
;
1159 // FIXME: add DoS prevention/filters?
1163 // Are we throttling this session?
1164 if (config
->cluster_iam_master
)
1165 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1167 master_throttle_packet(sp
->tbf_out
, data
, size
);
1170 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1172 // We are walled-gardening this
1173 master_garden_packet(s
, data
, size
);
1177 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1179 // Add on L2TP header
1181 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIPV6
);
1183 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1186 // Snooping this session, send it to intercept box
1187 if (sp
->snoop_ip
&& sp
->snoop_port
)
1188 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1190 sp
->cout
+= len
; // byte count
1191 sp
->total_cout
+= len
; // byte count
1194 sess_local
[s
].cout
+= len
; // To send to master..
1198 // Helper routine for the TBF filters.
1199 // Used to send queued data in to the user!
1201 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1207 uint8_t b
[MAXETHER
+ 20];
1209 if (len
< 0 || len
> MAXETHER
)
1211 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1215 // Skip the tun header
1219 ip
= *(in_addr_t
*)(buf
+ 16);
1224 t
= session
[s
].tunnel
;
1227 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1229 // Add on L2TP header
1231 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1233 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1236 // Snooping this session.
1237 if (sp
->snoop_ip
&& sp
->snoop_port
)
1238 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1240 sp
->cout
+= len
; // byte count
1241 sp
->total_cout
+= len
; // byte count
1244 sess_local
[s
].cout
+= len
; // To send to master..
1247 // add an AVP (16 bit)
1248 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1250 uint16_t l
= (m
? 0x8008 : 0x0008);
1251 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1252 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1253 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1254 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1258 // add an AVP (32 bit)
1259 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1261 uint16_t l
= (m
? 0x800A : 0x000A);
1262 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1263 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1264 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1265 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1269 // add an AVP (string)
1270 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1272 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1273 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1274 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1275 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1276 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1277 c
->length
+= 6 + strlen(val
);
1281 static void controlb(controlt
* c
, uint16_t avp
, char *val
, unsigned int len
, uint8_t m
)
1283 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1284 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1285 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1286 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1287 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1288 c
->length
+= 6 + len
;
1291 // new control connection
1292 static controlt
*controlnew(uint16_t mtype
)
1296 c
= malloc(sizeof(controlt
));
1300 controlfree
= c
->next
;
1304 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1306 control16(c
, 0, mtype
, 1);
1310 // send zero block if nothing is waiting
1312 static void controlnull(tunnelidt t
)
1315 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1318 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1319 *(uint16_t *) (buf
+ 2) = htons(12); // length
1320 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1321 *(uint16_t *) (buf
+ 6) = htons(0); // session
1322 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1323 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1324 tunnelsend(buf
, 12, t
);
1327 // add a control message to a tunnel, and send if within window
1328 static void controladd(controlt
* c
, tunnelidt t
, sessionidt far
)
1330 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1331 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1332 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1333 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1334 tunnel
[t
].ns
++; // advance sequence
1335 // link in message in to queue
1336 if (tunnel
[t
].controlc
)
1337 tunnel
[t
].controle
->next
= c
;
1339 tunnel
[t
].controls
= c
;
1341 tunnel
[t
].controle
= c
;
1342 tunnel
[t
].controlc
++;
1344 // send now if space in window
1345 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1347 tunnel
[t
].try = 0; // first send
1348 tunnelsend(c
->buf
, c
->length
, t
);
1353 // Throttle or Unthrottle a session
1355 // Throttle the data from/to through a session to no more than
1356 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1359 // If either value is -1, the current value is retained for that
1362 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1364 if (!session
[s
].opened
)
1365 return; // No-one home.
1367 if (!*session
[s
].user
)
1368 return; // User not logged in
1372 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1373 if (session
[s
].tbf_in
)
1374 free_tbf(session
[s
].tbf_in
);
1377 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1379 session
[s
].tbf_in
= 0;
1381 session
[s
].throttle_in
= rate_in
;
1386 int bytes
= rate_out
* 1024 / 8;
1387 if (session
[s
].tbf_out
)
1388 free_tbf(session
[s
].tbf_out
);
1391 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1393 session
[s
].tbf_out
= 0;
1395 session
[s
].throttle_out
= rate_out
;
1399 // add/remove filters from session (-1 = no change)
1400 static void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1402 if (!session
[s
].opened
)
1403 return; // No-one home.
1405 if (!*session
[s
].user
)
1406 return; // User not logged in
1409 if (filter_in
> MAXFILTER
) filter_in
= -1;
1410 if (filter_out
> MAXFILTER
) filter_out
= -1;
1411 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1412 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1416 if (session
[s
].filter_in
)
1417 ip_filters
[session
[s
].filter_in
- 1].used
--;
1420 ip_filters
[filter_in
- 1].used
++;
1422 session
[s
].filter_in
= filter_in
;
1425 if (filter_out
>= 0)
1427 if (session
[s
].filter_out
)
1428 ip_filters
[session
[s
].filter_out
- 1].used
--;
1431 ip_filters
[filter_out
- 1].used
++;
1433 session
[s
].filter_out
= filter_out
;
1437 // start tidy shutdown of session
1438 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1440 int walled_garden
= session
[s
].walled_garden
;
1443 CSTAT(sessionshutdown
);
1445 if (!session
[s
].opened
)
1447 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1448 return; // not a live session
1451 if (!session
[s
].die
)
1453 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1454 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1455 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1458 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1460 // RADIUS Stop message
1461 uint16_t r
= sess_local
[s
].radius
;
1467 // stop, if not already trying
1468 if (radius
[r
].state
!= RADIUSSTOP
)
1469 radiussend(r
, RADIUSSTOP
);
1472 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1474 // Save counters to dump to accounting file
1475 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1476 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1480 { // IP allocated, clear and unroute
1483 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1485 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1486 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1489 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1490 session
[s
].route
[r
].ip
= 0;
1493 if (session
[s
].ip_pool_index
== -1) // static ip
1495 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1501 // unroute IPv6, if setup
1502 if (session
[s
].flags
& SF_IPV6_ROUTED
)
1503 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1506 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1507 throttle_session(s
, 0, 0);
1511 controlt
*c
= controlnew(14); // sending CDN
1515 *(uint16_t *) buf
= htons(result
);
1516 *(uint16_t *) (buf
+2) = htons(error
);
1517 controlb(c
, 1, buf
, 4, 1);
1520 control16(c
, 1, result
, 1);
1522 control16(c
, 14, s
, 1); // assigned session (our end)
1523 controladd(c
, session
[s
].tunnel
, session
[s
].far
); // send the message
1526 if (!session
[s
].die
)
1527 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1529 // update filter refcounts
1530 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1531 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1533 cluster_send_session(s
);
1536 void sendipcp(tunnelidt t
, sessionidt s
)
1538 uint8_t buf
[MAXCONTROL
];
1539 uint16_t r
= sess_local
[s
].radius
;
1549 sessionshutdown(s
, "No free RADIUS sessions for IPCP", 3, 0);
1553 if (radius
[r
].state
!= RADIUSIPCP
)
1555 radius
[r
].state
= RADIUSIPCP
;
1559 radius
[r
].retry
= backoff(radius
[r
].try++);
1560 if (radius
[r
].try > 10)
1562 radiusclear(r
, s
); // Clear radius session.
1563 sessionshutdown(s
, "No reply to IPCP.", 3, 0);
1567 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1571 q
[1] = r
>> RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1572 *(uint16_t *) (q
+ 2) = htons(10);
1575 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1576 config
->bind_address
? config
->bind_address
:
1577 my_address
; // send my IP
1579 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1580 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1582 // If we have an IPv6 prefix length configured, assume we should
1583 // try to negotiate an IPv6 session as well. Unless we've had a
1584 // (N)ACK for IPV6CP.
1585 if (config
->ipv6_prefix
.s6_addr
[0] > 0 &&
1586 !(session
[s
].flags
& SF_IPV6CP_ACKED
) &&
1587 !(session
[s
].flags
& SF_IPV6_NACKED
))
1589 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1593 q
[1] = r
>> RADIUS_SHIFT
; // ID, don't care, we
1594 // only send one type
1596 *(uint16_t *) (q
+ 2) = htons(14);
1599 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1600 *(uint32_t *) (q
+ 10) = 0;
1603 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1607 static void sessionclear(sessionidt s
)
1609 memset(&session
[s
], 0, sizeof(session
[s
]));
1610 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1611 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1613 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1614 session
[s
].next
= sessionfree
;
1618 // kill a session now
1619 void sessionkill(sessionidt s
, char *reason
)
1624 if (!session
[s
].opened
) // not alive
1627 if (session
[s
].next
)
1629 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1633 session
[s
].die
= TIME
;
1634 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1635 if (sess_local
[s
].radius
)
1636 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1638 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1640 cluster_send_session(s
);
1643 static void tunnelclear(tunnelidt t
)
1646 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1647 tunnel
[t
].state
= TUNNELFREE
;
1650 // kill a tunnel now
1651 static void tunnelkill(tunnelidt t
, char *reason
)
1658 tunnel
[t
].state
= TUNNELDIE
;
1660 // free control messages
1661 while ((c
= tunnel
[t
].controls
))
1663 controlt
* n
= c
->next
;
1664 tunnel
[t
].controls
= n
;
1665 tunnel
[t
].controlc
--;
1666 c
->next
= controlfree
;
1670 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1671 if (session
[s
].tunnel
== t
)
1672 sessionkill(s
, reason
);
1676 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1677 cli_tunnel_actions
[t
].action
= 0;
1678 cluster_send_tunnel(t
);
1681 // shut down a tunnel cleanly
1682 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1686 CSTAT(tunnelshutdown
);
1688 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1690 // never set up, can immediately kill
1691 tunnelkill(t
, reason
);
1694 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1697 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1698 if (session
[s
].tunnel
== t
)
1699 sessionshutdown(s
, reason
, 3, 0);
1701 tunnel
[t
].state
= TUNNELDIE
;
1702 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1703 cluster_send_tunnel(t
);
1704 // TBA - should we wait for sessions to stop?
1707 controlt
*c
= controlnew(4); // sending StopCCN
1712 *(uint16_t *) buf
= htons(result
);
1713 *(uint16_t *) (buf
+2) = htons(error
);
1716 int m
= strlen(msg
);
1717 if (m
+ 4 > sizeof(buf
))
1718 m
= sizeof(buf
) - 4;
1720 memcpy(buf
+4, msg
, m
);
1724 controlb(c
, 1, buf
, l
, 1);
1727 control16(c
, 1, result
, 1);
1729 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1730 controladd(c
, t
, 0); // send the message
1734 // read and process packet on tunnel (UDP)
1735 void processudp(uint8_t * buf
, int len
, struct sockaddr_in
*addr
)
1737 char *chapresponse
= NULL
;
1738 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1739 uint8_t *p
= buf
+ 2;
1746 LOG_HEX(5, "UDP Data", buf
, len
);
1747 STAT(tunnel_rx_packets
);
1748 INC_STAT(tunnel_rx_bytes
, len
);
1751 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1752 STAT(tunnel_rx_errors
);
1755 if ((buf
[1] & 0x0F) != 2)
1757 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1758 STAT(tunnel_rx_errors
);
1763 l
= ntohs(*(uint16_t *) p
);
1766 t
= ntohs(*(uint16_t *) p
);
1768 s
= ntohs(*(uint16_t *) p
);
1770 if (s
>= MAXSESSION
)
1772 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1773 STAT(tunnel_rx_errors
);
1778 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1779 STAT(tunnel_rx_errors
);
1784 ns
= ntohs(*(uint16_t *) p
);
1786 nr
= ntohs(*(uint16_t *) p
);
1791 uint16_t o
= ntohs(*(uint16_t *) p
);
1796 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1797 STAT(tunnel_rx_errors
);
1803 uint16_t message
= 0xFFFF; // message type
1805 uint8_t mandatory
= 0;
1806 uint8_t authtype
= 0; // proxy auth type
1807 uint16_t asession
= 0; // assigned session
1808 uint32_t amagic
= 0; // magic number
1809 uint8_t aflags
= 0; // flags from last LCF
1810 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1811 char called
[MAXTEL
] = ""; // called number
1812 char calling
[MAXTEL
] = ""; // calling number
1814 if (!config
->cluster_iam_master
)
1816 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1820 // control messages must have bits 0x80|0x40|0x08
1821 // (type, length and sequence) set, and bits 0x02|0x01
1822 // (offset and priority) clear
1823 if ((*buf
& 0xCB) != 0xC8)
1825 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1826 STAT(tunnel_rx_errors
);
1830 // check for duplicate tunnel open message
1836 // Is this a duplicate of the first packet? (SCCRQ)
1838 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1840 if (tunnel
[i
].state
!= TUNNELOPENING
||
1841 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1842 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1845 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1850 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1851 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1853 // if no tunnel specified, assign one
1856 if (!(t
= new_tunnel()))
1858 LOG(1, 0, 0, "No more tunnels\n");
1859 STAT(tunnel_overflow
);
1863 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1864 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1865 tunnel
[t
].window
= 4; // default window
1866 STAT(tunnel_created
);
1867 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1868 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1871 // If the 'ns' just received is not the 'nr' we're
1872 // expecting, just send an ack and drop it.
1874 // if 'ns' is less, then we got a retransmitted packet.
1875 // if 'ns' is greater than missed a packet. Either way
1876 // we should ignore it.
1877 if (ns
!= tunnel
[t
].nr
)
1879 // is this the sequence we were expecting?
1880 STAT(tunnel_rx_errors
);
1881 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1882 t
, ns
, tunnel
[t
].nr
);
1884 if (l
) // Is this not a ZLB?
1889 // This is used to time out old tunnels
1890 tunnel
[t
].lastrec
= time_now
;
1892 // check sequence of this message
1894 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1895 // some to clear maybe?
1896 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1898 controlt
*c
= tunnel
[t
].controls
;
1899 tunnel
[t
].controls
= c
->next
;
1900 tunnel
[t
].controlc
--;
1901 c
->next
= controlfree
;
1904 tunnel
[t
].try = 0; // we have progress
1907 // receiver advance (do here so quoted correctly in any sends below)
1908 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1909 if (skip
< 0) skip
= 0;
1910 if (skip
< tunnel
[t
].controlc
)
1912 // some control packets can now be sent that were previous stuck out of window
1913 int tosend
= tunnel
[t
].window
- skip
;
1914 controlt
*c
= tunnel
[t
].controls
;
1922 tunnel
[t
].try = 0; // first send
1923 tunnelsend(c
->buf
, c
->length
, t
);
1928 if (!tunnel
[t
].controlc
)
1929 tunnel
[t
].retry
= 0; // caught up
1932 { // if not a null message
1938 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1940 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1946 LOG(1, s
, t
, "Invalid length in AVP\n");
1947 STAT(tunnel_rx_errors
);
1952 if (flags
& 0x3C) // reserved bits, should be clear
1954 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1956 result
= 2; // general error
1957 error
= 3; // reserved field non-zero
1962 if (*(uint16_t *) (b
))
1964 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1966 result
= 2; // general error
1967 error
= 6; // generic vendor-specific error
1968 msg
= "unsupported vendor-specific";
1972 mtype
= ntohs(*(uint16_t *) (b
));
1980 // handle hidden AVPs
1981 if (!*config
->l2tpsecret
)
1983 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1985 result
= 2; // general error
1986 error
= 6; // generic vendor-specific error
1987 msg
= "secret not specified";
1990 if (!session
[s
].random_vector_length
)
1992 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
1994 result
= 2; // general error
1995 error
= 6; // generic
1996 msg
= "no random vector";
2001 LOG(2, s
, t
, "Short hidden AVP.\n");
2003 result
= 2; // general error
2004 error
= 2; // length is wrong
2009 LOG(4, s
, t
, "Hidden AVP\n");
2012 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2014 orig_len
= ntohs(*(uint16_t *) b
);
2015 if (orig_len
> n
+ 2)
2017 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2021 result
= 2; // general error
2022 error
= 2; // length is wrong
2031 LOG(4, s
, t
, " AVP %d (%s) len %d\n", mtype
, avp_name(mtype
), n
);
2034 case 0: // message type
2035 message
= ntohs(*(uint16_t *) b
);
2036 mandatory
= flags
& 0x80;
2037 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_message_type(message
));
2039 case 1: // result code
2041 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2042 const char* resdesc
= "(unknown)";
2045 resdesc
= stopccn_result_code(rescode
);
2047 else if (message
== 14)
2049 resdesc
= cdn_result_code(rescode
);
2052 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2055 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2056 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, error_code(errcode
));
2059 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2064 case 2: // protocol version
2066 version
= ntohs(*(uint16_t *) (b
));
2067 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2068 if (version
&& version
!= 0x0100)
2069 { // allow 0.0 and 1.0
2070 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2072 result
= 5; // unspported protocol version
2073 error
= 0x0100; // supported version
2079 case 3: // framing capabilities
2080 // LOG(4, s, t, "Framing capabilities\n");
2082 case 4: // bearer capabilities
2083 // LOG(4, s, t, "Bearer capabilities\n");
2085 case 5: // tie breaker
2086 // We never open tunnels, so we don't care about tie breakers
2087 // LOG(4, s, t, "Tie breaker\n");
2089 case 6: // firmware revision
2090 // LOG(4, s, t, "Firmware revision\n");
2092 case 7: // host name
2093 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2094 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2095 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2096 // TBA - to send to RADIUS
2098 case 8: // vendor name
2099 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2100 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2101 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2103 case 9: // assigned tunnel
2104 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2105 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2107 case 10: // rx window
2108 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2109 if (!tunnel
[t
].window
)
2110 tunnel
[t
].window
= 1; // window of 0 is silly
2111 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2113 case 11: // Challenge
2115 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2116 build_chap_response(b
, 2, n
, &chapresponse
);
2119 case 13: // Response
2120 // Why did they send a response? We never challenge.
2121 LOG(2, s
, t
, " received unexpected challenge response\n");
2124 case 14: // assigned session
2125 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2126 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2128 case 15: // call serial number
2129 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2131 case 18: // bearer type
2132 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2135 case 19: // framing type
2136 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2139 case 21: // called number
2140 memset(called
, 0, sizeof(called
));
2141 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2142 LOG(4, s
, t
, " Called <%s>\n", called
);
2144 case 22: // calling number
2145 memset(calling
, 0, sizeof(calling
));
2146 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2147 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2151 case 24: // tx connect speed
2154 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2158 // AS5300s send connect speed as a string
2160 memset(tmp
, 0, sizeof(tmp
));
2161 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2162 session
[s
].tx_connect_speed
= atol(tmp
);
2164 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2166 case 38: // rx connect speed
2169 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2173 // AS5300s send connect speed as a string
2175 memset(tmp
, 0, sizeof(tmp
));
2176 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2177 session
[s
].rx_connect_speed
= atol(tmp
);
2179 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2181 case 25: // Physical Channel ID
2183 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2184 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2187 case 29: // Proxy Authentication Type
2189 uint16_t atype
= ntohs(*(uint16_t *)b
);
2190 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, auth_type(atype
));
2192 authtype
= AUTHCHAP
;
2193 else if (atype
== 3)
2198 case 30: // Proxy Authentication Name
2201 memset(authname
, 0, sizeof(authname
));
2202 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2203 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2207 case 31: // Proxy Authentication Challenge
2209 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2210 if (sess_local
[s
].radius
)
2211 memcpy(radius
[sess_local
[s
].radius
].auth
, b
, 16);
2214 case 32: // Proxy Authentication ID
2216 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2217 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2218 if (sess_local
[s
].radius
)
2219 radius
[sess_local
[s
].radius
].id
= authid
;
2222 case 33: // Proxy Authentication Response
2223 LOG(4, s
, t
, " Proxy Auth Response\n");
2225 case 27: // last sent lcp
2226 { // find magic number
2227 uint8_t *p
= b
, *e
= p
+ n
;
2228 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2230 if (*p
== 5 && p
[1] == 6) // Magic-Number
2231 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2232 else if (*p
== 3 && p
[1] == 4 && *(uint16_t *) (p
+ 2) == htons(PPPPAP
)) // Authentication-Protocol (PAP)
2234 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol (CHAP)
2235 authtype
= AUTHCHAP
;
2236 else if (*p
== 7) // Protocol-Field-Compression
2237 aflags
|= SESSIONPFC
;
2238 else if (*p
== 8) // Address-and-Control-Field-Compression
2239 aflags
|= SESSIONACFC
;
2244 case 28: // last recv lcp confreq
2246 case 26: // Initial Received LCP CONFREQ
2248 case 39: // seq required - we control it as an LNS anyway...
2250 case 36: // Random Vector
2251 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2252 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2253 memcpy(session
[s
].random_vector
, b
, n
);
2254 session
[s
].random_vector_length
= n
;
2258 static char e
[] = "unknown AVP 0xXXXX";
2259 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2261 result
= 2; // general error
2262 error
= 8; // unknown mandatory AVP
2263 sprintf((msg
= e
) + 14, "%04x", mtype
);
2270 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2274 case 1: // SCCRQ - Start Control Connection Request
2276 controlt
*c
= controlnew(2); // sending SCCRP
2277 control16(c
, 2, version
, 1); // protocol version
2278 control32(c
, 3, 3, 1); // framing
2279 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2280 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2281 control16(c
, 9, t
, 1); // assigned tunnel
2282 controladd(c
, t
, 0); // send the resply
2284 tunnel
[t
].state
= TUNNELOPENING
;
2287 tunnel
[t
].state
= TUNNELOPEN
;
2290 tunnel
[t
].state
= TUNNELOPEN
;
2291 controlnull(t
); // ack
2294 controlnull(t
); // ack
2295 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2298 controlnull(t
); // simply ACK
2315 sessionfree
= session
[s
].next
;
2316 memset(&session
[s
], 0, sizeof(session
[s
]));
2318 if (s
> config
->cluster_highest_sessionid
)
2319 config
->cluster_highest_sessionid
= s
;
2321 // make a RADIUS session
2322 if ((r
= radiusnew(s
)))
2324 controlt
*c
= controlnew(11); // sending ICRP
2325 session
[s
].opened
= time_now
;
2326 session
[s
].tunnel
= t
;
2327 session
[s
].far
= asession
;
2328 session
[s
].last_packet
= time_now
;
2329 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2330 control16(c
, 14, s
, 1); // assigned session
2331 controladd(c
, t
, asession
); // send the reply
2333 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
2334 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2335 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2336 STAT(session_created
);
2341 LOG(1, s
, t
, "No free RADIUS sessions for ICRQ\n");
2346 STAT(session_overflow
);
2347 LOG(1, 0, t
, "No free sessions\n");
2351 controlt
*c
= controlnew(14); // CDN
2352 control16(c
, 1, 4, 1); // temporary lack of resources
2353 controladd(c
, session
[s
].tunnel
, asession
); // send the message
2360 if (amagic
== 0) amagic
= time_now
;
2361 session
[s
].magic
= amagic
; // set magic number
2362 session
[s
].l2tp_flags
= aflags
; // set flags received
2363 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2364 controlnull(t
); // ack
2365 // proxy authentication type is not supported
2366 if (!(config
->radius_authtypes
& authtype
))
2367 authtype
= config
->radius_authprefer
;
2370 sendlcp(t
, s
, authtype
);
2373 controlnull(t
); // ack
2374 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2377 LOG(1, s
, t
, "Missing message type\n");
2380 STAT(tunnel_rx_errors
);
2382 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2384 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2387 if (chapresponse
) free(chapresponse
);
2388 cluster_send_tunnel(t
);
2392 LOG(4, s
, t
, " Got a ZLB ack\n");
2399 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2400 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2401 { // HDLC address header, discard
2407 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2408 STAT(tunnel_rx_errors
);
2418 prot
= ntohs(*(uint16_t *) p
);
2423 if (s
&& !session
[s
].opened
) // Is something wrong??
2425 if (!config
->cluster_iam_master
)
2427 // Pass it off to the master to deal with..
2428 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2433 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2434 STAT(tunnel_rx_errors
);
2440 session
[s
].last_packet
= time_now
;
2441 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2442 processpap(t
, s
, p
, l
);
2444 else if (prot
== PPPCHAP
)
2446 session
[s
].last_packet
= time_now
;
2447 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2448 processchap(t
, s
, p
, l
);
2450 else if (prot
== PPPLCP
)
2452 session
[s
].last_packet
= time_now
;
2453 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2454 processlcp(t
, s
, p
, l
);
2456 else if (prot
== PPPIPCP
)
2458 session
[s
].last_packet
= time_now
;
2459 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2460 processipcp(t
, s
, p
, l
);
2462 else if (prot
== PPPIPV6CP
)
2464 if (config
->ipv6_prefix
.s6_addr
[0] > 0)
2466 session
[s
].last_packet
= time_now
;
2467 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2468 processipv6cp(t
, s
, p
, l
);
2472 LOG(1, s
, t
, "IPv6 not configured; ignoring IPv6CP\n");
2475 else if (prot
== PPPCCP
)
2477 session
[s
].last_packet
= time_now
;
2478 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2479 processccp(t
, s
, p
, l
);
2481 else if (prot
== PPPIP
)
2485 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2486 return; // closing session, PPP not processed
2489 session
[s
].last_packet
= time_now
;
2490 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2492 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2496 processipin(t
, s
, p
, l
);
2498 else if (prot
== PPPIPV6
)
2500 if (!config
->ipv6_prefix
.s6_addr
[0] > 0)
2502 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2507 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2508 return; // closing session, PPP not processed
2511 session
[s
].last_packet
= time_now
;
2512 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2514 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2518 processipv6in(t
, s
, p
, l
);
2522 STAT(tunnel_rx_errors
);
2523 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2528 // read and process packet on tun
2529 static void processtun(uint8_t * buf
, int len
)
2531 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2532 STAT(tun_rx_packets
);
2533 INC_STAT(tun_rx_bytes
, len
);
2541 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2542 STAT(tun_rx_errors
);
2546 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2547 processipout(buf
, len
);
2548 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2549 && config
->ipv6_prefix
.s6_addr
[0] > 0)
2550 processipv6out(buf
, len
);
2556 // Maximum number of actions to complete.
2557 // This is to avoid sending out too many packets
2559 #define MAX_ACTIONS 500
2561 static int regular_cleanups(void)
2563 static sessionidt s
= 0; // Next session to check for actions on.
2567 static clockt next_acct
= 0;
2568 static clockt next_shut_acct
= 0;
2571 LOG(3, 0, 0, "Begin regular cleanup\n");
2573 for (r
= 1; r
< MAXRADIUS
; r
++)
2575 if (!radius
[r
].state
)
2577 if (radius
[r
].retry
)
2579 if (radius
[r
].retry
<= TIME
)
2582 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
2584 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
2586 // check for expired tunnels
2587 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2589 STAT(tunnel_timeout
);
2590 tunnelkill(t
, "Expired");
2593 // check for message resend
2594 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2596 // resend pending messages as timeout on reply
2597 if (tunnel
[t
].retry
<= TIME
)
2599 controlt
*c
= tunnel
[t
].controls
;
2600 uint8_t w
= tunnel
[t
].window
;
2601 tunnel
[t
].try++; // another try
2602 if (tunnel
[t
].try > 5)
2603 tunnelkill(t
, "Timeout on control message"); // game over
2607 tunnelsend(c
->buf
, c
->length
, t
);
2613 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2615 controlt
*c
= controlnew(6); // sending HELLO
2616 controladd(c
, t
, 0); // send the message
2617 LOG(3, 0, t
, "Sending HELLO message\n");
2620 // Check for tunnel changes requested from the CLI
2621 if ((a
= cli_tunnel_actions
[t
].action
))
2623 cli_tunnel_actions
[t
].action
= 0;
2624 if (a
& CLI_TUN_KILL
)
2626 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2627 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2634 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2637 if (s
> config
->cluster_highest_sessionid
)
2640 if (!session
[s
].opened
) // Session isn't in use
2643 // check for expired sessions
2646 if (session
[s
].die
<= TIME
)
2648 sessionkill(s
, "Expired");
2649 if (++count
>= MAX_ACTIONS
) break;
2654 if (session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2656 // IPCP has not completed yet. Resend
2657 LOG(3, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2658 sendipcp(session
[s
].tunnel
, s
);
2661 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2662 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2664 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2665 STAT(session_timeout
);
2666 if (++count
>= MAX_ACTIONS
) break;
2670 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2671 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2673 uint8_t b
[MAXCONTROL
] = {0};
2675 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2679 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2680 *(uint16_t *)(q
+ 2) = htons(8); // Length
2681 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2683 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2684 (int)(time_now
- session
[s
].last_packet
));
2685 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2686 if (++count
>= MAX_ACTIONS
) break;
2689 // Check for actions requested from the CLI
2690 if ((a
= cli_session_actions
[s
].action
))
2694 cli_session_actions
[s
].action
= 0;
2695 if (a
& CLI_SESS_KILL
)
2697 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2698 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2699 a
= 0; // dead, no need to check for other actions
2702 if (a
& CLI_SESS_NOSNOOP
)
2704 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2705 session
[s
].snoop_ip
= 0;
2706 session
[s
].snoop_port
= 0;
2709 else if (a
& CLI_SESS_SNOOP
)
2711 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2712 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2713 cli_session_actions
[s
].snoop_port
);
2715 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2716 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2720 if (a
& CLI_SESS_NOTHROTTLE
)
2722 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2723 throttle_session(s
, 0, 0);
2726 else if (a
& CLI_SESS_THROTTLE
)
2728 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2729 cli_session_actions
[s
].throttle_in
,
2730 cli_session_actions
[s
].throttle_out
);
2732 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2736 if (a
& CLI_SESS_NOFILTER
)
2738 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2739 filter_session(s
, 0, 0);
2742 else if (a
& CLI_SESS_FILTER
)
2744 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2745 cli_session_actions
[s
].filter_in
,
2746 cli_session_actions
[s
].filter_out
);
2748 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2753 cluster_send_session(s
);
2755 if (++count
>= MAX_ACTIONS
) break;
2758 // RADIUS interim accounting
2759 if (config
->radius_accounting
&& config
->radius_interim
> 0
2760 && session
[s
].ip
&& !session
[s
].walled_garden
2761 && !sess_local
[s
].radius
// RADIUS already in progress
2762 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2764 if (!(r
= radiusnew(s
)))
2766 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2767 STAT(radius_overflow
);
2771 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2772 session
[s
].user
, session
[s
].unique_id
);
2774 radiussend(r
, RADIUSINTERIM
);
2775 sess_local
[s
].last_interim
= time_now
;
2777 if (++count
>= MAX_ACTIONS
)
2782 if (*config
->accounting_dir
)
2784 if (next_acct
<= TIME
)
2786 // Dump accounting data
2787 next_acct
= TIME
+ ACCT_TIME
;
2788 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2791 else if (next_shut_acct
<= TIME
)
2793 // Dump accounting data for shutdown sessions
2794 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2800 if (count
>= MAX_ACTIONS
)
2801 return 1; // Didn't finish!
2803 LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2809 // Are we in the middle of a tunnel update, or radius
2812 static int still_busy(void)
2815 static clockt last_talked
= 0;
2816 static clockt start_busy_wait
= 0;
2817 if (start_busy_wait
== 0)
2818 start_busy_wait
= TIME
;
2820 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2822 if (!tunnel
[i
].controlc
)
2825 if (last_talked
!= TIME
)
2827 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
2833 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2834 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2836 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2840 for (i
= 1; i
< MAXRADIUS
; i
++)
2842 if (radius
[i
].state
== RADIUSNULL
)
2844 if (radius
[i
].state
== RADIUSWAIT
)
2847 if (last_talked
!= TIME
)
2849 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2858 static fd_set readset
;
2859 static int readset_n
= 0;
2861 // main loop - gets packets on tun or udp and processes them
2862 static void mainloop(void)
2867 clockt next_cluster_ping
= 0; // send initial ping immediately
2868 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2870 LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2871 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2874 FD_SET(udpfd
, &readset
);
2875 FD_SET(tunfd
, &readset
);
2876 FD_SET(controlfd
, &readset
);
2877 FD_SET(clifd
, &readset
);
2878 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2880 if (tunfd
> readset_n
) readset_n
= tunfd
;
2881 if (controlfd
> readset_n
) readset_n
= controlfd
;
2882 if (clifd
> readset_n
) readset_n
= clifd
;
2883 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2885 while (!main_quit
|| still_busy())
2891 int bgp_set
[BGP_NUM_PEERS
];
2894 if (config
->reload_config
)
2896 // Update the config state based on config settings
2900 memcpy(&r
, &readset
, sizeof(fd_set
));
2902 to
.tv_usec
= 100000; // 1/10th of a second.
2906 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2908 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2911 FD_SET(bgp_peers
[i
].sock
, &r
);
2912 if (bgp_peers
[i
].sock
> n
)
2913 n
= bgp_peers
[i
].sock
;
2918 FD_SET(bgp_peers
[i
].sock
, &w
);
2919 if (bgp_peers
[i
].sock
> n
)
2920 n
= bgp_peers
[i
].sock
;
2924 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2926 n
= select(n
+ 1, &r
, 0, 0, &to
);
2929 STAT(select_called
);
2934 if (errno
== EINTR
||
2935 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2938 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2944 struct sockaddr_in addr
;
2948 int cluster_pkts
= 0;
2951 if (FD_ISSET(controlfd
, &r
))
2953 alen
= sizeof(addr
);
2954 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
2959 if (config
->cluster_iam_master
)
2961 for (i
= 0; i
< config
->num_radfds
; i
++)
2963 if (FD_ISSET(radfds
[i
], &r
))
2965 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2972 if (FD_ISSET(clifd
, &r
))
2976 alen
= sizeof(addr
);
2977 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
2983 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
2989 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2991 int isr
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0;
2992 int isw
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0;
2993 bgp_process(&bgp_peers
[i
], isr
, isw
);
2999 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3002 if (FD_ISSET(udpfd
, &r
))
3004 alen
= sizeof(addr
);
3005 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3007 processudp(buf
, s
, &addr
);
3018 if (FD_ISSET(tunfd
, &r
))
3020 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3033 if (FD_ISSET(cluster_sockfd
, &r
))
3035 alen
= sizeof(addr
);
3036 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3038 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3043 FD_CLR(cluster_sockfd
, &r
);
3049 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3050 STAT(multi_read_used
);
3052 if (c
>= config
->multi_read_count
)
3054 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3055 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3057 STAT(multi_read_exceeded
);
3061 // Runs on every machine (master and slaves).
3062 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
3064 // Check to see which of the cluster is still alive..
3066 cluster_send_ping(basetime
); // Only does anything if we're a slave
3067 cluster_check_master(); // ditto.
3069 cluster_heartbeat(); // Only does anything if we're a master.
3070 cluster_check_slaves(); // ditto.
3072 master_update_counts(); // If we're a slave, send our byte counters to our master.
3074 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3075 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3077 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3080 // Run token bucket filtering queue..
3081 // Only run it every 1/10th of a second.
3082 // Runs on all machines both master and slave.
3084 static clockt last_run
= 0;
3085 if (last_run
!= TIME
)
3092 /* Handle timeouts. Make sure that this gets run anyway, even if there was
3093 * something to read, else under load this will never actually run....
3096 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
3098 if (regular_cleanups())
3101 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
3105 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
3110 // Are we the master and shutting down??
3111 if (config
->cluster_iam_master
)
3112 cluster_heartbeat(); // Flush any queued changes..
3114 // Ok. Notify everyone we're shutting down. If we're
3115 // the master, this will force an election.
3116 cluster_send_ping(0);
3119 // Important!!! We MUST not process any packets past this point!
3122 static void stripdomain(char *host
)
3126 if ((p
= strchr(host
, '.')))
3132 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3138 while (fgets(buf
, sizeof(buf
), resolv
))
3140 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3143 if (!isspace(buf
[6]))
3147 while (isspace(*b
)) b
++;
3152 while (*b
&& !isspace(*b
)) b
++;
3154 if (buf
[0] == 'd') // domain is canonical
3160 // first search line
3163 // hold, may be subsequent domain line
3164 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3175 int hl
= strlen(host
);
3176 int dl
= strlen(domain
);
3177 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3178 host
[hl
-dl
- 1] = 0;
3182 *p
= 0; // everything after first dot
3187 // Init data structures
3188 static void initdata(int optdebug
, char *optconfig
)
3192 if (!(config
= shared_malloc(sizeof(configt
))))
3194 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3198 memset(config
, 0, sizeof(configt
));
3199 time(&config
->start_time
);
3200 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3201 config
->debug
= optdebug
;
3202 config
->num_tbfs
= MAXTBFS
;
3203 config
->rl_rate
= 28; // 28kbps
3204 config
->cluster_master_min_adv
= 1;
3205 strcpy(config
->random_device
, RANDOMDEVICE
);
3207 log_stream
= stderr
;
3210 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3212 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3215 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3218 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3220 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3223 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3225 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3228 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3230 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3234 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3236 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3240 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3242 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3246 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3248 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3252 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3254 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3257 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3259 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3261 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3264 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3266 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3268 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3271 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3273 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3274 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3275 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3276 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3278 // Put all the sessions on the free list marked as undefined.
3279 for (i
= 1; i
< MAXSESSION
; i
++)
3281 session
[i
].next
= i
+ 1;
3282 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3284 session
[MAXSESSION
- 1].next
= 0;
3287 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3288 for (i
= 1; i
< MAXTUNNEL
; i
++)
3289 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3293 // Grab my hostname unless it's been specified
3294 gethostname(hostname
, sizeof(hostname
));
3295 stripdomain(hostname
);
3298 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3301 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3303 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3309 static int assign_ip_address(sessionidt s
)
3313 time_t best_time
= time_now
;
3314 char *u
= session
[s
].user
;
3318 CSTAT(assign_ip_address
);
3320 for (i
= 1; i
< ip_pool_size
; i
++)
3322 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3325 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3332 if (ip_address_pool
[i
].last
< best_time
)
3335 if (!(best_time
= ip_address_pool
[i
].last
))
3336 break; // never used, grab this one
3342 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3346 session
[s
].ip
= ip_address_pool
[best
].address
;
3347 session
[s
].ip_pool_index
= best
;
3348 ip_address_pool
[best
].assigned
= 1;
3349 ip_address_pool
[best
].last
= time_now
;
3350 ip_address_pool
[best
].session
= s
;
3351 if (session
[s
].walled_garden
)
3352 /* Don't track addresses of users in walled garden (note: this
3353 means that their address isn't "sticky" even if they get
3355 ip_address_pool
[best
].user
[0] = 0;
3357 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3360 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3361 reuse
? "Reusing" : "Allocating", best
);
3366 static void free_ip_address(sessionidt s
)
3368 int i
= session
[s
].ip_pool_index
;
3371 CSTAT(free_ip_address
);
3374 return; // what the?
3376 if (i
< 0) // Is this actually part of the ip pool?
3380 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3382 ip_address_pool
[i
].assigned
= 0;
3383 ip_address_pool
[i
].session
= 0;
3384 ip_address_pool
[i
].last
= time_now
;
3388 // Fsck the address pool against the session table.
3389 // Normally only called when we become a master.
3391 // This isn't perfect: We aren't keep tracking of which
3392 // users used to have an IP address.
3394 void rebuild_address_pool(void)
3399 // Zero the IP pool allocation, and build
3400 // a map from IP address to pool index.
3401 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3403 ip_address_pool
[i
].assigned
= 0;
3404 ip_address_pool
[i
].session
= 0;
3405 if (!ip_address_pool
[i
].address
)
3408 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3411 for (i
= 0; i
< MAXSESSION
; ++i
)
3414 if (!(session
[i
].opened
&& session
[i
].ip
))
3417 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3419 if (session
[i
].ip_pool_index
< 0)
3421 // Not allocated out of the pool.
3422 if (ipid
< 1) // Not found in the pool either? good.
3425 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3426 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3428 // Fall through and process it as part of the pool.
3432 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3434 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3436 session
[i
].ip_pool_index
= ipid
;
3440 ip_address_pool
[ipid
].assigned
= 1;
3441 ip_address_pool
[ipid
].session
= i
;
3442 ip_address_pool
[ipid
].last
= time_now
;
3443 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3444 session
[i
].ip_pool_index
= ipid
;
3445 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3450 // Fix the address pool to match a changed session.
3451 // (usually when the master sends us an update).
3452 static void fix_address_pool(int sid
)
3456 ipid
= session
[sid
].ip_pool_index
;
3458 if (ipid
> ip_pool_size
)
3459 return; // Ignore it. rebuild_address_pool will fix it up.
3461 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3462 return; // Just ignore it. rebuild_address_pool will take care of it.
3464 ip_address_pool
[ipid
].assigned
= 1;
3465 ip_address_pool
[ipid
].session
= sid
;
3466 ip_address_pool
[ipid
].last
= time_now
;
3467 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3471 // Add a block of addresses to the IP pool to hand out.
3473 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3477 mask
= 0xffffffff; // Host route only.
3481 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3484 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3486 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3487 continue; // Skip 0 and broadcast addresses.
3489 ip_address_pool
[ip_pool_size
].address
= i
;
3490 ip_address_pool
[ip_pool_size
].assigned
= 0;
3492 if (ip_pool_size
>= MAXIPPOOL
)
3494 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3500 // Initialize the IP address pool
3501 static void initippool()
3506 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3508 if (!(f
= fopen(IPPOOLFILE
, "r")))
3510 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3514 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3517 buf
[4095] = 0; // Force it to be zero terminated/
3519 if (*buf
== '#' || *buf
== '\n')
3520 continue; // Skip comments / blank lines
3521 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3522 if ((p
= (char *)strchr(buf
, ':')))
3526 src
= inet_addr(buf
);
3527 if (src
== INADDR_NONE
)
3529 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3532 // This entry is for a specific IP only
3533 if (src
!= config
->bind_address
)
3538 if ((p
= (char *)strchr(pool
, '/')))
3542 in_addr_t start
= 0, mask
= 0;
3544 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3546 if (!*p
|| !(numbits
= atoi(p
)))
3548 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3551 start
= ntohl(inet_addr(pool
));
3552 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3554 // Add a static route for this pool
3555 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3556 fmtaddr(htonl(start
), 0), 32 + mask
);
3558 routeset(0, start
, mask
, 0, 1);
3560 add_to_ip_pool(start
, mask
);
3564 // It's a single ip address
3565 add_to_ip_pool(inet_addr(pool
), 0);
3569 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3572 void snoop_send_packet(char *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3574 struct sockaddr_in snoop_addr
= {0};
3575 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3578 snoop_addr
.sin_family
= AF_INET
;
3579 snoop_addr
.sin_addr
.s_addr
= destination
;
3580 snoop_addr
.sin_port
= ntohs(port
);
3582 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3583 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3584 htons(snoop_addr
.sin_port
));
3586 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3587 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3589 STAT(packets_snooped
);
3592 static int dump_session(FILE **f
, sessiont
*s
)
3594 if (!s
->opened
|| !s
->ip
|| !(s
->cin
|| s
->cout
) || !*s
->user
|| s
->walled_garden
)
3599 char filename
[1024];
3601 time_t now
= time(NULL
);
3603 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3604 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3606 if (!(*f
= fopen(filename
, "w")))
3608 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3612 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3613 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3617 "# format: username ip qos uptxoctets downrxoctets\n",
3623 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3624 fprintf(*f
, "%s %s %d %u %u\n",
3625 s
->user
, // username
3626 fmtaddr(htonl(s
->ip
), 0), // ip
3627 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3628 (uint32_t) s
->cin
, // uptxoctets
3629 (uint32_t) s
->cout
); // downrxoctets
3631 s
->pin
= s
->cin
= 0;
3632 s
->pout
= s
->cout
= 0;
3637 static void dump_acct_info(int all
)
3643 CSTAT(dump_acct_info
);
3647 for (i
= 0; i
< shut_acct_n
; i
++)
3648 dump_session(&f
, &shut_acct
[i
]);
3654 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3655 dump_session(&f
, &session
[i
]);
3662 int main(int argc
, char *argv
[])
3666 char *optconfig
= CONFIGFILE
;
3668 time(&basetime
); // start clock
3671 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3676 if (fork()) exit(0);
3678 freopen("/dev/null", "r", stdin
);
3679 freopen("/dev/null", "w", stdout
);
3680 freopen("/dev/null", "w", stderr
);
3689 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3692 printf("Args are:\n"
3693 "\t-d\t\tDetach from terminal\n"
3694 "\t-c <file>\tConfig file\n"
3695 "\t-h <hostname>\tForce hostname\n"
3703 // Start the timer routine off
3705 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3706 signal(SIGALRM
, sigalrm_handler
);
3707 siginterrupt(SIGALRM
, 0);
3710 initdata(optdebug
, optconfig
);
3714 init_tbf(config
->num_tbfs
);
3716 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3717 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3718 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3721 rlim
.rlim_cur
= RLIM_INFINITY
;
3722 rlim
.rlim_max
= RLIM_INFINITY
;
3723 // Remove the maximum core size
3724 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3725 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3727 // Make core dumps go to /tmp
3731 if (config
->scheduler_fifo
)
3734 struct sched_param params
= {0};
3735 params
.sched_priority
= 1;
3737 if (get_nprocs() < 2)
3739 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3740 config
->scheduler_fifo
= 0;
3744 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3746 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3750 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3751 config
->scheduler_fifo
= 0;
3756 /* Set up the cluster communications port. */
3757 if (cluster_init() < 0)
3761 signal(SIGPIPE
, SIG_IGN
);
3762 bgp_setup(config
->as_number
);
3763 bgp_add_route(config
->bind_address
, 0xffffffff);
3764 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3766 if (config
->neighbour
[i
].name
[0])
3767 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3768 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3769 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3774 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3780 signal(SIGHUP
, sighup_handler
);
3781 signal(SIGTERM
, sigterm_handler
);
3782 signal(SIGINT
, sigterm_handler
);
3783 signal(SIGQUIT
, sigquit_handler
);
3784 signal(SIGCHLD
, sigchild_handler
);
3786 // Prevent us from getting paged out
3787 if (config
->lock_pages
)
3789 if (!mlockall(MCL_CURRENT
))
3790 LOG(1, 0, 0, "Locking pages into memory\n");
3792 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3797 // Drop privileges here
3798 if (config
->target_uid
> 0 && geteuid() == 0)
3799 setuid(config
->target_uid
);
3804 /* try to shut BGP down cleanly; with luck the sockets will be
3805 writable since we're out of the select */
3806 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3807 if (bgp_peers
[i
].state
== Established
)
3808 bgp_stop(&bgp_peers
[i
]);
3811 /* remove plugins (so cleanup code gets run) */
3814 // Remove the PID file if we wrote it
3815 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3816 unlink(config
->pid_file
);
3818 /* kill CLI children */
3819 signal(SIGTERM
, SIG_IGN
);
3824 static void sighup_handler(int sig
)
3828 if (log_stream
!= stderr
)
3837 static void sigalrm_handler(int sig
)
3839 // Log current traffic stats
3841 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3842 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3843 (udp_rx
/ 1024.0 / 1024.0 * 8),
3844 (eth_tx
/ 1024.0 / 1024.0 * 8),
3845 (eth_rx
/ 1024.0 / 1024.0 * 8),
3846 (udp_tx
/ 1024.0 / 1024.0 * 8),
3847 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3848 udp_rx_pkt
, eth_rx_pkt
);
3850 udp_tx
= udp_rx
= 0;
3851 udp_rx_pkt
= eth_rx_pkt
= 0;
3852 eth_tx
= eth_rx
= 0;
3854 if (config
->dump_speed
)
3855 printf("%s\n", config
->bandwidth
);
3857 // Update the internal time counter
3859 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3864 struct param_timer p
= { time_now
};
3865 run_plugins(PLUGIN_TIMER
, &p
);
3870 static void sigterm_handler(int sig
)
3872 LOG(1, 0, 0, "Shutting down cleanly\n");
3876 static void sigquit_handler(int sig
)
3880 LOG(1, 0, 0, "Shutting down without saving sessions\n");
3882 if (config
->cluster_iam_master
)
3884 for (i
= 1; i
< MAXSESSION
; i
++)
3886 if (session
[i
].opened
)
3887 sessionkill(i
, "L2TPNS Closing");
3889 for (i
= 1; i
< MAXTUNNEL
; i
++)
3891 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3892 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3899 static void sigchild_handler(int sig
)
3901 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3905 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
)
3908 *challenge_response
= NULL
;
3910 if (!*config
->l2tpsecret
)
3912 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3916 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
3918 *challenge_response
= (char *)calloc(17, 1);
3921 MD5Update(&ctx
, &id
, 1);
3922 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3923 MD5Update(&ctx
, challenge
, challenge_length
);
3924 MD5Final(*challenge_response
, &ctx
);
3929 static int facility_value(char *name
)
3932 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3934 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3935 return facilitynames
[i
].c_val
;
3940 static void update_config()
3944 static int timeout
= 0;
3945 static int interval
= 0;
3952 if (log_stream
!= stderr
)
3958 if (*config
->log_filename
)
3960 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3962 char *p
= config
->log_filename
+ 7;
3965 openlog("l2tpns", LOG_PID
, facility_value(p
));
3969 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
3971 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
3973 fseek(log_stream
, 0, SEEK_END
);
3974 setbuf(log_stream
, NULL
);
3978 log_stream
= stderr
;
3979 setbuf(log_stream
, NULL
);
3985 log_stream
= stderr
;
3986 setbuf(log_stream
, NULL
);
3990 config
->numradiusservers
= 0;
3991 for (i
= 0; i
< MAXRADSERVER
; i
++)
3992 if (config
->radiusserver
[i
])
3994 config
->numradiusservers
++;
3995 // Set radius port: if not set, take the port from the
3996 // first radius server. For the first radius server,
3997 // take the #defined default value from l2tpns.h
3999 // test twice, In case someone works with
4000 // a secondary radius server without defining
4001 // a primary one, this will work even then.
4002 if (i
> 0 && !config
->radiusport
[i
])
4003 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4004 if (!config
->radiusport
[i
])
4005 config
->radiusport
[i
] = RADPORT
;
4008 if (!config
->numradiusservers
)
4009 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4011 config
->num_radfds
= 1 << RADIUS_SHIFT
;
4013 // parse radius_authtypes_s
4014 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4015 p
= config
->radius_authtypes_s
;
4018 char *s
= strpbrk(p
, " \t,");
4024 while (*s
== ' ' || *s
== '\t')
4031 if (!strncasecmp("chap", p
, strlen(p
)))
4033 else if (!strncasecmp("pap", p
, strlen(p
)))
4036 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4038 config
->radius_authtypes
|= type
;
4039 if (!config
->radius_authprefer
)
4040 config
->radius_authprefer
= type
;
4045 if (!config
->radius_authtypes
)
4047 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4048 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4051 // normalise radius_authtypes_s
4052 if (config
->radius_authprefer
== AUTHPAP
)
4054 strcpy(config
->radius_authtypes_s
, "pap");
4055 if (config
->radius_authtypes
& AUTHCHAP
)
4056 strcat(config
->radius_authtypes_s
, ", chap");
4060 strcpy(config
->radius_authtypes_s
, "chap");
4061 if (config
->radius_authtypes
& AUTHPAP
)
4062 strcat(config
->radius_authtypes_s
, ", pap");
4065 // re-initialise the random number source
4066 initrandom(config
->random_device
);
4069 for (i
= 0; i
< MAXPLUGINS
; i
++)
4071 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4074 if (*config
->plugins
[i
])
4077 add_plugin(config
->plugins
[i
]);
4079 else if (*config
->old_plugins
[i
])
4082 remove_plugin(config
->old_plugins
[i
]);
4086 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4087 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
4088 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4089 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4090 if (!*config
->cluster_interface
)
4091 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4093 if (!config
->cluster_hb_interval
)
4094 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4096 if (!config
->cluster_hb_timeout
)
4097 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4099 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4101 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4102 // late, ensure we're sufficiently larger than that
4103 int t
= 4 * config
->cluster_hb_interval
+ 11;
4105 if (config
->cluster_hb_timeout
< t
)
4107 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4108 config
->cluster_hb_timeout
= t
;
4111 // Push timing changes to the slaves immediately if we're the master
4112 if (config
->cluster_iam_master
)
4113 cluster_heartbeat();
4115 interval
= config
->cluster_hb_interval
;
4116 timeout
= config
->cluster_hb_timeout
;
4120 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4123 if ((f
= fopen(config
->pid_file
, "w")))
4125 fprintf(f
, "%d\n", getpid());
4127 config
->wrote_pid
= 1;
4131 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4135 config
->reload_config
= 0;
4138 static void read_config_file()
4142 if (!config
->config_file
) return;
4143 if (!(f
= fopen(config
->config_file
, "r")))
4145 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4149 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4151 LOG(3, 0, 0, "Done reading config file\n");
4156 int sessionsetup(tunnelidt t
, sessionidt s
)
4158 // A session now exists, set it up
4164 CSTAT(sessionsetup
);
4166 LOG(3, s
, t
, "Doing session setup for session\n");
4170 assign_ip_address(s
);
4173 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4174 sessionshutdown(s
, "No IP addresses available.", 2, 7);
4177 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4178 fmtaddr(htonl(session
[s
].ip
), 0));
4182 // Make sure this is right
4183 session
[s
].tunnel
= t
;
4185 // zap old sessions with same IP and/or username
4186 // Don't kill gardened sessions - doing so leads to a DoS
4187 // from someone who doesn't need to know the password
4190 user
= session
[s
].user
;
4191 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4193 if (i
== s
) continue;
4194 if (!session
[s
].opened
) continue;
4195 if (ip
== session
[i
].ip
)
4197 sessionkill(i
, "Duplicate IP address");
4201 if (config
->allow_duplicate_users
) continue;
4202 if (session
[s
].walled_garden
|| session
[i
].walled_garden
) continue;
4203 if (!strcasecmp(user
, session
[i
].user
))
4204 sessionkill(i
, "Duplicate session for users");
4211 // Add the route for this session.
4212 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4214 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4215 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4218 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4221 // Static IPs need to be routed if not already
4222 // convered by a Framed-Route. Anything else is part
4223 // of the IP address pool and is already routed, it
4224 // just needs to be added to the IP cache.
4225 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4226 if (session
[s
].ip_pool_index
== -1) // static ip
4228 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4231 cache_ipmap(session
[s
].ip
, s
);
4234 if (!session
[s
].unique_id
)
4236 // did this session just finish radius?
4237 LOG(3, s
, t
, "Sending initial IPCP to client\n");
4239 session
[s
].unique_id
= ++last_id
;
4242 // Run the plugin's against this new session.
4244 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4245 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4248 // Allocate TBFs if throttled
4249 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4250 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4252 session
[s
].last_packet
= time_now
;
4254 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4255 fmtaddr(htonl(session
[s
].ip
), 0),
4256 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4258 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4260 return 1; // RADIUS OK and IP allocated, done...
4264 // This session just got dropped on us by the master or something.
4265 // Make sure our tables up up to date...
4267 int load_session(sessionidt s
, sessiont
*new)
4273 if (new->ip_pool_index
>= MAXIPPOOL
||
4274 new->tunnel
>= MAXTUNNEL
)
4276 LOG(0, s
, 0, "Strange session update received!\n");
4277 // FIXME! What to do here?
4282 // Ok. All sanity checks passed. Now we're committed to
4283 // loading the new session.
4286 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4288 // See if routes/ip cache need updating
4289 if (new->ip
!= session
[s
].ip
)
4292 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4293 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4294 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4302 // remove old routes...
4303 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4305 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4306 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4309 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4315 if (session
[s
].ip_pool_index
== -1) // static IP
4317 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4319 else // It's part of the IP pool, remove it manually.
4320 uncache_ipmap(session
[s
].ip
);
4325 // add new routes...
4326 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4328 if ((new->ip
& new->route
[i
].mask
) ==
4329 (new->route
[i
].ip
& new->route
[i
].mask
))
4332 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4338 // If there's a new one, add it.
4339 if (new->ip_pool_index
== -1)
4341 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4344 cache_ipmap(new->ip
, s
);
4349 if (new->flags
& SF_IPV6_ROUTED
&& !(session
[s
].flags
& SF_IPV6_ROUTED
))
4350 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4353 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4355 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4359 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4361 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4362 new->filter_out
= 0;
4365 if (new->filter_in
!= session
[s
].filter_in
)
4367 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4368 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4371 if (new->filter_out
!= session
[s
].filter_out
)
4373 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4374 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4377 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4378 // for walking the sessions to forward byte counts to the master.
4379 config
->cluster_highest_sessionid
= s
;
4381 // TEMP: old session struct used a uint32_t to define the throttle
4382 // speed for both up/down, new uses a uint16_t for each. Deal with
4383 // sessions from an old master for migration.
4384 if (new->throttle_out
== 0 && new->tbf_out
)
4385 new->throttle_out
= new->throttle_in
;
4387 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4389 // Do fixups into address pool.
4390 if (new->ip_pool_index
!= -1)
4391 fix_address_pool(s
);
4396 static void initplugins()
4400 loaded_plugins
= ll_init();
4401 // Initialize the plugins to nothing
4402 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4403 plugins
[i
] = ll_init();
4406 static void *open_plugin(char *plugin_name
, int load
)
4408 char path
[256] = "";
4410 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4411 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4412 return dlopen(path
, RTLD_NOW
);
4415 // plugin callback to get a config value
4416 static void *getconfig(char *key
, enum config_typet type
)
4420 for (i
= 0; config_values
[i
].key
; i
++)
4422 if (!strcmp(config_values
[i
].key
, key
))
4424 if (config_values
[i
].type
== type
)
4425 return ((void *) config
) + config_values
[i
].offset
;
4427 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4428 key
, type
, config_values
[i
].type
);
4434 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4438 static int add_plugin(char *plugin_name
)
4440 static struct pluginfuncs funcs
= {
4445 sessiontbysessionidt
,
4446 sessionidtbysessiont
,
4453 cluster_send_session
,
4456 void *p
= open_plugin(plugin_name
, 1);
4457 int (*initfunc
)(struct pluginfuncs
*);
4462 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4466 if (ll_contains(loaded_plugins
, p
))
4469 return 0; // already loaded
4473 int *v
= dlsym(p
, "plugin_api_version");
4474 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4476 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4482 if ((initfunc
= dlsym(p
, "plugin_init")))
4484 if (!initfunc(&funcs
))
4486 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4492 ll_push(loaded_plugins
, p
);
4494 for (i
= 0; i
< max_plugin_functions
; i
++)
4497 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4499 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4500 ll_push(plugins
[i
], x
);
4504 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4508 static void run_plugin_done(void *plugin
)
4510 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4516 static int remove_plugin(char *plugin_name
)
4518 void *p
= open_plugin(plugin_name
, 0);
4524 if (ll_contains(loaded_plugins
, p
))
4527 for (i
= 0; i
< max_plugin_functions
; i
++)
4530 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4531 ll_delete(plugins
[i
], x
);
4534 ll_delete(loaded_plugins
, p
);
4540 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4544 int run_plugins(int plugin_type
, void *data
)
4546 int (*func
)(void *data
);
4548 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4549 return PLUGIN_RET_ERROR
;
4551 ll_reset(plugins
[plugin_type
]);
4552 while ((func
= ll_next(plugins
[plugin_type
])))
4556 if (r
!= PLUGIN_RET_OK
)
4557 return r
; // stop here
4560 return PLUGIN_RET_OK
;
4563 static void plugins_done()
4567 ll_reset(loaded_plugins
);
4568 while ((p
= ll_next(loaded_plugins
)))
4572 static void processcontrol(uint8_t * buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4574 struct nsctl request
;
4575 struct nsctl response
;
4576 int type
= unpack_control(&request
, buf
, len
);
4580 if (log_stream
&& config
->debug
>= 4)
4584 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4585 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4589 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4590 dump_control(&request
, log_stream
);
4596 case NSCTL_REQ_LOAD
:
4597 if (request
.argc
!= 1)
4599 response
.type
= NSCTL_RES_ERR
;
4601 response
.argv
[0] = "name of plugin required";
4603 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4605 response
.type
= NSCTL_RES_ERR
;
4607 response
.argv
[0] = !r
4608 ? "plugin already loaded"
4609 : "error loading plugin";
4613 response
.type
= NSCTL_RES_OK
;
4619 case NSCTL_REQ_UNLOAD
:
4620 if (request
.argc
!= 1)
4622 response
.type
= NSCTL_RES_ERR
;
4624 response
.argv
[0] = "name of plugin required";
4626 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4628 response
.type
= NSCTL_RES_ERR
;
4630 response
.argv
[0] = !r
4631 ? "plugin not loaded"
4632 : "plugin not found";
4636 response
.type
= NSCTL_RES_OK
;
4642 case NSCTL_REQ_HELP
:
4643 response
.type
= NSCTL_RES_OK
;
4646 ll_reset(loaded_plugins
);
4647 while ((p
= ll_next(loaded_plugins
)))
4649 char **help
= dlsym(p
, "plugin_control_help");
4650 while (response
.argc
< 0xff && help
&& *help
)
4651 response
.argv
[response
.argc
++] = *help
++;
4656 case NSCTL_REQ_CONTROL
:
4658 struct param_control param
= {
4659 config
->cluster_iam_master
,
4666 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4668 if (r
== PLUGIN_RET_ERROR
)
4670 response
.type
= NSCTL_RES_ERR
;
4672 response
.argv
[0] = param
.additional
4674 : "error returned by plugin";
4676 else if (r
== PLUGIN_RET_NOTMASTER
)
4678 static char msg
[] = "must be run on master: 000.000.000.000";
4680 response
.type
= NSCTL_RES_ERR
;
4682 if (config
->cluster_master_address
)
4684 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4685 response
.argv
[0] = msg
;
4689 response
.argv
[0] = "must be run on master: none elected";
4692 else if (!(param
.response
& NSCTL_RESPONSE
))
4694 response
.type
= NSCTL_RES_ERR
;
4696 response
.argv
[0] = param
.response
4697 ? "unrecognised response value from plugin"
4698 : "unhandled action";
4702 response
.type
= param
.response
;
4704 if (param
.additional
)
4707 response
.argv
[0] = param
.additional
;
4715 response
.type
= NSCTL_RES_ERR
;
4717 response
.argv
[0] = "error unpacking control packet";
4720 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4723 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4727 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4730 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4731 if (log_stream
&& config
->debug
>= 4)
4733 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4734 dump_control(&response
, log_stream
);
4738 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4739 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4744 static tunnelidt
new_tunnel()
4747 for (i
= 1; i
< MAXTUNNEL
; i
++)
4749 if (tunnel
[i
].state
== TUNNELFREE
)
4751 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4752 if (i
> config
->cluster_highest_tunnelid
)
4753 config
->cluster_highest_tunnelid
= i
;
4757 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4762 // We're becoming the master. Do any required setup..
4764 // This is principally telling all the plugins that we're
4765 // now a master, and telling them about all the sessions
4766 // that are active too..
4768 void become_master(void)
4771 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4773 // running a bunch of iptables commands is slow and can cause
4774 // the master to drop tunnels on takeover--kludge around the
4775 // problem by forking for the moment (note: race)
4776 if (!fork_and_close())
4778 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4780 if (!session
[s
].opened
) // Not an in-use session.
4783 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4789 for (i
= 0; i
< config
->num_radfds
; i
++)
4791 FD_SET(radfds
[i
], &readset
);
4792 if (radfds
[i
] > readset_n
)
4793 readset_n
= radfds
[i
];
4797 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4803 if (CLI_HELP_REQUESTED
)
4804 return CLI_HELP_NO_ARGS
;
4807 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4809 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4812 if (!session
[s
].opened
)
4815 idle
= time_now
- session
[s
].last_packet
;
4816 idle
/= 5 ; // In multiples of 5 seconds.
4826 for (i
= 0; i
< 63; ++i
)
4828 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4830 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4831 cli_print(cli
, "%d total sessions open.", count
);
4835 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4841 if (CLI_HELP_REQUESTED
)
4842 return CLI_HELP_NO_ARGS
;
4845 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4847 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4850 if (!session
[s
].opened
)
4853 d
= time_now
- session
[s
].opened
;
4856 while (d
> 1 && open
< 32)
4866 for (i
= 0; i
< 30; ++i
)
4868 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4871 cli_print(cli
, "%d total sessions open.", count
);
4877 * This unencodes the AVP using the L2TP secret and the previously
4878 * stored random vector. It overwrites the hidden data with the
4879 * unhidden AVP subformat.
4881 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
4888 // Compute initial pad
4890 MD5Update(&ctx
, (uint8_t) (type
>> 8) & 0xff, 1);
4891 MD5Update(&ctx
, (uint8_t) type
& 0xff, 1);
4892 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4893 MD5Update(&ctx
, vector
, vec_len
);
4894 MD5Final(digest
, &ctx
);
4896 // pointer to last decoded 16 octets
4901 // calculate a new pad based on the last decoded block
4902 if (d
>= sizeof(digest
))
4905 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4906 MD5Update(&ctx
, last
, sizeof(digest
));
4907 MD5Final(digest
, &ctx
);
4913 *value
++ ^= digest
[d
++];
4918 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
4922 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
4923 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
4924 case FILTER_PORT_OP_GT
: return port
> p
->port
;
4925 case FILTER_PORT_OP_LT
: return port
< p
->port
;
4926 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
4932 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
4936 case FILTER_FLAG_OP_ANY
:
4937 return (flags
& sflags
) || (~flags
& cflags
);
4939 case FILTER_FLAG_OP_ALL
:
4940 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
4942 case FILTER_FLAG_OP_EST
:
4943 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
4949 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
4951 uint16_t frag_offset
;
4955 uint16_t src_port
= 0;
4956 uint16_t dst_port
= 0;
4958 ip_filter_rulet
*rule
;
4960 if (len
< 20) // up to end of destination address
4963 if ((*buf
>> 4) != 4) // IPv4
4966 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
4968 src_ip
= *(in_addr_t
*) (buf
+ 12);
4969 dst_ip
= *(in_addr_t
*) (buf
+ 16);
4971 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
4973 int l
= (buf
[0] & 0xf) * 4; // length of IP header
4974 if (len
< l
+ 4) // ports
4977 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
4978 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
4979 if (proto
== IPPROTO_TCP
)
4981 if (len
< l
+ 14) // flags
4984 flags
= buf
[l
+ 13] & 0x3f;
4988 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
4990 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
4993 if (rule
->src_wild
!= INADDR_BROADCAST
&&
4994 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
4997 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
4998 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
5003 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5011 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5013 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5016 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5019 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5020 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5027 return rule
->action
== FILTER_ACTION_PERMIT
;