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 1.103 2005-05-13 01:29:40 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("bind_address", bind_address
, IPv4
),
117 CONFIG("peer_address", peer_address
, IPv4
),
118 CONFIG("send_garp", send_garp
, BOOL
),
119 CONFIG("throttle_speed", rl_rate
, UNSIGNED_LONG
),
120 CONFIG("throttle_buckets", num_tbfs
, INT
),
121 CONFIG("accounting_dir", accounting_dir
, STRING
),
122 CONFIG("setuid", target_uid
, INT
),
123 CONFIG("dump_speed", dump_speed
, BOOL
),
124 CONFIG("cleanup_interval", cleanup_interval
, INT
),
125 CONFIG("multi_read_count", multi_read_count
, INT
),
126 CONFIG("scheduler_fifo", scheduler_fifo
, BOOL
),
127 CONFIG("lock_pages", lock_pages
, BOOL
),
128 CONFIG("icmp_rate", icmp_rate
, INT
),
129 CONFIG("packet_limit", max_packets
, INT
),
130 CONFIG("cluster_address", cluster_address
, IPv4
),
131 CONFIG("cluster_interface", cluster_interface
, STRING
),
132 CONFIG("cluster_hb_interval", cluster_hb_interval
, INT
),
133 CONFIG("cluster_hb_timeout", cluster_hb_timeout
, INT
),
134 CONFIG("ipv6_prefix", ipv6_prefix
, IPv6
),
138 static char *plugin_functions
[] = {
145 "plugin_new_session",
146 "plugin_kill_session",
148 "plugin_radius_response",
149 "plugin_become_master",
150 "plugin_new_session_master",
153 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
155 // Counters for shutdown sessions
156 static sessiont shut_acct
[8192];
157 static sessionidt shut_acct_n
= 0;
159 tunnelt
*tunnel
= NULL
; // Array of tunnel structures.
160 sessiont
*session
= NULL
; // Array of session structures.
161 sessionlocalt
*sess_local
= NULL
; // Array of local per-session counters.
162 radiust
*radius
= NULL
; // Array of radius structures.
163 ippoolt
*ip_address_pool
= NULL
; // Array of dynamic IP addresses.
164 ip_filtert
*ip_filters
= NULL
; // Array of named filters.
165 static controlt
*controlfree
= 0;
166 struct Tstats
*_statistics
= NULL
;
168 struct Tringbuffer
*ringbuffer
= NULL
;
171 static void cache_ipmap(in_addr_t ip
, int s
);
172 static void uncache_ipmap(in_addr_t ip
);
173 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
);
174 static void free_ip_address(sessionidt s
);
175 static void dump_acct_info(int all
);
176 static void sighup_handler(int sig
);
177 static void sigalrm_handler(int sig
);
178 static void sigterm_handler(int sig
);
179 static void sigquit_handler(int sig
);
180 static void sigchild_handler(int sig
);
181 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
);
182 static void update_config(void);
183 static void read_config_file(void);
184 static void initplugins(void);
185 static int add_plugin(char *plugin_name
);
186 static int remove_plugin(char *plugin_name
);
187 static void plugins_done(void);
188 static void processcontrol(uint8_t *buf
, int len
, struct sockaddr_in
*addr
, int alen
);
189 static tunnelidt
new_tunnel(void);
190 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
);
192 // return internal time (10ths since process startup)
193 static clockt
now(void)
197 return (t
.tv_sec
- basetime
) * 10 + t
.tv_usec
/ 100000 + 1;
200 // work out a retry time based on try number
201 // This is a straight bounded exponential backoff.
202 // Maximum re-try time is 32 seconds. (2^5).
203 clockt
backoff(uint8_t try)
205 if (try > 5) try = 5; // max backoff
206 return now() + 10 * (1 << try);
211 // Log a debug message. Typically called via the LOG macro
213 void _log(int level
, sessionidt s
, tunnelidt t
, const char *format
, ...)
215 static char message
[65536] = {0};
221 if (++ringbuffer
->tail
>= RINGBUFFER_SIZE
)
222 ringbuffer
->tail
= 0;
223 if (ringbuffer
->tail
== ringbuffer
->head
)
224 if (++ringbuffer
->head
>= RINGBUFFER_SIZE
)
225 ringbuffer
->head
= 0;
227 ringbuffer
->buffer
[ringbuffer
->tail
].level
= level
;
228 ringbuffer
->buffer
[ringbuffer
->tail
].session
= s
;
229 ringbuffer
->buffer
[ringbuffer
->tail
].tunnel
= t
;
230 va_start(ap
, format
);
231 vsnprintf(ringbuffer
->buffer
[ringbuffer
->tail
].message
, 4095, format
, ap
);
236 if (config
->debug
< level
) return;
238 va_start(ap
, format
);
239 vsnprintf(message
, sizeof(message
), format
, ap
);
242 fprintf(log_stream
, "%s %02d/%02d %s", time_now_string
, t
, s
, message
);
244 syslog(level
+ 2, "%02d/%02d %s", t
, s
, message
); // We don't need LOG_EMERG or LOG_ALERT
249 void _log_hex(int level
, const char *title
, const char *data
, int maxsize
)
252 const uint8_t *d
= (const uint8_t *) data
;
254 if (config
->debug
< level
) return;
256 // No support for _log_hex to syslog
259 _log(level
, 0, 0, "%s (%d bytes):\n", title
, maxsize
);
260 setvbuf(log_stream
, NULL
, _IOFBF
, 16384);
262 for (i
= 0; i
< maxsize
; )
264 fprintf(log_stream
, "%4X: ", i
);
265 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
267 fprintf(log_stream
, "%02X ", d
[j
]);
269 fputs(": ", log_stream
);
272 for (; j
< i
+ 16; j
++)
274 fputs(" ", log_stream
);
276 fputs(": ", log_stream
);
279 fputs(" ", log_stream
);
280 for (j
= i
; j
< maxsize
&& j
< (i
+ 16); j
++)
282 if (d
[j
] >= 0x20 && d
[j
] < 0x7f && d
[j
] != 0x20)
283 fputc(d
[j
], log_stream
);
285 fputc('.', log_stream
);
288 fputs(" ", log_stream
);
292 fputs("\n", log_stream
);
296 setbuf(log_stream
, NULL
);
300 // initialise the random generator
301 static void initrandom(char *source
)
303 static char path
[sizeof(config
->random_device
)] = "*undefined*";
305 // reinitialise only if we are forced to do so or if the config has changed
306 if (source
&& !strncmp(path
, source
, sizeof(path
)))
309 // close previous source, if any
310 if (rand_fd
>= 0) close(rand_fd
);
317 snprintf(path
, sizeof(path
), "%s", source
);
321 rand_fd
= open(path
, O_RDONLY
|O_NONBLOCK
);
323 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
324 path
, strerror(errno
));
328 // no source: seed prng
330 unsigned seed
= time_now
^ getpid();
331 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed
);
336 // fill buffer with random data
337 void random_data(uint8_t *buf
, int len
)
344 n
= read(rand_fd
, buf
, len
);
345 if (n
>= len
) return;
350 LOG(0, 0, 0, "Error reading from random source: %s\n",
353 // fall back to rand()
361 // append missing data
363 // not using the low order bits from the prng stream
364 buf
[n
++] = (rand() >> 4) & 0xff;
369 // This adds it to the routing table, advertises it
370 // via BGP if enabled, and stuffs it into the
371 // 'sessionbyip' cache.
373 // 'ip' and 'mask' must be in _host_ order.
375 static void routeset(sessionidt s
, in_addr_t ip
, in_addr_t mask
, in_addr_t gw
, int add
)
380 if (!mask
) mask
= 0xffffffff;
382 ip
&= mask
; // Force the ip to be the first one in the route.
384 memset(&r
, 0, sizeof(r
));
385 r
.rt_dev
= config
->tundevice
;
386 r
.rt_dst
.sa_family
= AF_INET
;
387 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_dst
)->sin_addr
.s_addr
) = htonl(ip
);
388 r
.rt_gateway
.sa_family
= AF_INET
;
389 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_gateway
)->sin_addr
.s_addr
) = htonl(gw
);
390 r
.rt_genmask
.sa_family
= AF_INET
;
391 *(uint32_t *) & (((struct sockaddr_in
*) &r
.rt_genmask
)->sin_addr
.s_addr
) = htonl(mask
);
392 r
.rt_flags
= (RTF_UP
| RTF_STATIC
);
394 r
.rt_flags
|= RTF_GATEWAY
;
395 else if (mask
== 0xffffffff)
396 r
.rt_flags
|= RTF_HOST
;
398 LOG(1, s
, 0, "Route %s %s/%s%s%s\n", add
? "add" : "del",
399 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1),
400 gw
? " via" : "", gw
? fmtaddr(htonl(gw
), 2) : "");
402 if (ioctl(ifrfd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &r
) < 0)
403 LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno
));
407 bgp_add_route(htonl(ip
), htonl(mask
));
409 bgp_del_route(htonl(ip
), htonl(mask
));
412 // Add/Remove the IPs to the 'sessionbyip' cache.
413 // Note that we add the zero address in the case of
414 // a network route. Roll on CIDR.
416 // Note that 's == 0' implies this is the address pool.
417 // We still cache it here, because it will pre-fill
418 // the malloc'ed tree.
422 if (!add
) // Are we deleting a route?
423 s
= 0; // Caching the session as '0' is the same as uncaching.
425 for (i
= ip
; (i
&mask
) == (ip
&mask
) ; ++i
)
430 void route6set(sessionidt s
, struct in6_addr ip
, int prefixlen
, int add
)
433 char ipv6addr
[INET6_ADDRSTRLEN
];
437 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
441 memset(&rt
, 0, sizeof(rt
));
443 memcpy(&rt
.rtmsg_dst
, &ip
, sizeof(struct in6_addr
));
444 rt
.rtmsg_dst_len
= prefixlen
;
446 rt
.rtmsg_flags
= RTF_UP
;
447 rt
.rtmsg_ifindex
= tunidx
;
449 LOG(1, 0, 0, "Route %s %s/%d\n",
451 inet_ntop(AF_INET6
, &ip
, ipv6addr
, INET6_ADDRSTRLEN
),
454 if (ioctl(ifr6fd
, add
? SIOCADDRT
: SIOCDELRT
, (void *) &rt
) < 0)
455 LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
458 // FIXME: need to add BGP routing (RFC2858)
462 if (!add
) // Are we deleting a route?
463 s
= 0; // Caching the session as '0' is the same as uncaching.
465 cache_ipv6map(ip
, prefixlen
, s
);
471 // defined in linux/ipv6.h, but tricky to include from user-space
472 // TODO: move routing to use netlink rather than ioctl
474 struct in6_addr ifr6_addr
;
475 __u32 ifr6_prefixlen
;
476 unsigned int ifr6_ifindex
;
480 // Set up TUN interface
481 static void inittun(void)
484 struct in6_ifreq ifr6
;
485 struct sockaddr_in sin
= {0};
486 memset(&ifr
, 0, sizeof(ifr
));
487 ifr
.ifr_flags
= IFF_TUN
;
489 tunfd
= open(TUNDEVICE
, O_RDWR
);
492 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE
, strerror(errno
));
496 int flags
= fcntl(tunfd
, F_GETFL
, 0);
497 fcntl(tunfd
, F_SETFL
, flags
| O_NONBLOCK
);
499 if (ioctl(tunfd
, TUNSETIFF
, (void *) &ifr
) < 0)
501 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno
));
504 assert(strlen(ifr
.ifr_name
) < sizeof(config
->tundevice
));
505 strncpy(config
->tundevice
, ifr
.ifr_name
, sizeof(config
->tundevice
) - 1);
506 ifrfd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
508 sin
.sin_family
= AF_INET
;
509 sin
.sin_addr
.s_addr
= config
->bind_address
? config
->bind_address
: 0x01010101; // 1.1.1.1
510 memcpy(&ifr
.ifr_addr
, &sin
, sizeof(struct sockaddr
));
512 if (ioctl(ifrfd
, SIOCSIFADDR
, (void *) &ifr
) < 0)
514 LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno
));
517 /* Bump up the qlen to deal with bursts from the network */
519 if (ioctl(ifrfd
, SIOCSIFTXQLEN
, (void *) &ifr
) < 0)
521 LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno
));
524 ifr
.ifr_flags
= IFF_UP
;
525 if (ioctl(ifrfd
, SIOCSIFFLAGS
, (void *) &ifr
) < 0)
527 LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno
));
530 if (ioctl(ifrfd
, SIOCGIFINDEX
, (void *) &ifr
) < 0)
532 LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno
));
535 tunidx
= ifr
.ifr_ifindex
;
537 // Only setup IPv6 on the tun device if we have a configured prefix
538 if (config
->ipv6_prefix
.s6_addr
[0] > 0) {
539 ifr6fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
541 // Link local address is FE80::1
542 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
543 ifr6
.ifr6_addr
.s6_addr
[0] = 0xFE;
544 ifr6
.ifr6_addr
.s6_addr
[1] = 0x80;
545 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
546 ifr6
.ifr6_prefixlen
= 64;
547 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
548 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
550 LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
551 " %s\n", strerror(errno
));
554 // Global address is prefix::1
555 memset(&ifr6
.ifr6_addr
, 0, sizeof(ifr6
.ifr6_addr
));
556 ifr6
.ifr6_addr
= config
->ipv6_prefix
;
557 ifr6
.ifr6_addr
.s6_addr
[15] = 1;
558 ifr6
.ifr6_prefixlen
= 64;
559 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
560 if (ioctl(ifr6fd
, SIOCSIFADDR
, (void *) &ifr6
) < 0)
562 LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
569 static void initudp(void)
572 struct sockaddr_in addr
;
575 memset(&addr
, 0, sizeof(addr
));
576 addr
.sin_family
= AF_INET
;
577 addr
.sin_port
= htons(L2TPPORT
);
578 addr
.sin_addr
.s_addr
= config
->bind_address
;
579 udpfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
580 setsockopt(udpfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
582 int flags
= fcntl(udpfd
, F_GETFL
, 0);
583 fcntl(udpfd
, F_SETFL
, flags
| O_NONBLOCK
);
585 if (bind(udpfd
, (void *) &addr
, sizeof(addr
)) < 0)
587 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno
));
590 snoopfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
593 memset(&addr
, 0, sizeof(addr
));
594 addr
.sin_family
= AF_INET
;
595 addr
.sin_port
= htons(NSCTL_PORT
);
596 controlfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
597 setsockopt(controlfd
, SOL_SOCKET
, SO_REUSEADDR
, &on
, sizeof(on
));
598 if (bind(controlfd
, (void *) &addr
, sizeof(addr
)) < 0)
600 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno
));
606 // Find session by IP, < 1 for not found
608 // Confusingly enough, this 'ip' must be
609 // in _network_ order. This being the common
610 // case when looking it up from IP packet headers.
612 // We actually use this cache for two things.
613 // #1. For used IP addresses, this maps to the
614 // session ID that it's used by.
615 // #2. For un-used IP addresses, this maps to the
616 // index into the pool table that contains that
620 static int lookup_ipmap(in_addr_t ip
)
622 uint8_t *a
= (uint8_t *) &ip
;
623 uint8_t **d
= (uint8_t **) ip_hash
;
625 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
626 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
627 if (!(d
= (uint8_t **) d
[(size_t) *a
++])) return 0;
629 return (int) (intptr_t) d
[(size_t) *a
];
632 static int lookup_ipv6map(struct in6_addr ip
)
634 struct ipv6radix
*curnode
;
637 char ipv6addr
[INET6_ADDRSTRLEN
];
639 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
643 while (s
== 0 && i
< 15 && curnode
->branch
!= NULL
)
645 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
650 LOG(4, s
, session
[s
].tunnel
, "Looking up address %s and got %d\n",
651 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
658 sessionidt
sessionbyip(in_addr_t ip
)
660 int s
= lookup_ipmap(ip
);
663 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
664 return (sessionidt
) s
;
669 sessionidt
sessionbyipv6(struct in6_addr ip
)
672 CSTAT(sessionbyipv6
);
674 if (!memcmp(&config
->ipv6_prefix
, &ip
, 8) ||
675 (ip
.s6_addr
[0] == 0xFE && ip
.s6_addr
[1] == 0x80 &&
676 (ip
.s6_addr16
[1] == ip
.s6_addr16
[2] == ip
.s6_addr16
[3] == 0))) {
677 s
= lookup_ipmap(*(in_addr_t
*) &ip
.s6_addr
[8]);
679 s
= lookup_ipv6map(ip
);
682 if (s
> 0 && s
< MAXSESSION
&& session
[s
].opened
)
689 // Take an IP address in HOST byte order and
690 // add it to the sessionid by IP cache.
692 // (It's actually cached in network order)
694 static void cache_ipmap(in_addr_t ip
, int s
)
696 in_addr_t nip
= htonl(ip
); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
697 uint8_t *a
= (uint8_t *) &nip
;
698 uint8_t **d
= (uint8_t **) ip_hash
;
701 for (i
= 0; i
< 3; i
++)
703 if (!d
[(size_t) a
[i
]])
705 if (!(d
[(size_t) a
[i
]] = calloc(256, sizeof(void *))))
709 d
= (uint8_t **) d
[(size_t) a
[i
]];
712 d
[(size_t) a
[3]] = (uint8_t *) (intptr_t) s
;
715 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s\n", fmtaddr(nip
, 0));
718 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip
, 0));
719 // else a map to an ip pool index.
722 static void uncache_ipmap(in_addr_t ip
)
724 cache_ipmap(ip
, 0); // Assign it to the NULL session.
727 static void cache_ipv6map(struct in6_addr ip
, int prefixlen
, int s
)
731 struct ipv6radix
*curnode
;
732 char ipv6addr
[INET6_ADDRSTRLEN
];
734 curnode
= &ipv6_hash
[ip
.s6_addr
[0]];
736 bytes
= prefixlen
>> 3;
739 if (curnode
->branch
== NULL
)
741 if (!(curnode
->branch
= calloc(256,
742 sizeof (struct ipv6radix
))))
745 curnode
= &curnode
->branch
[ip
.s6_addr
[i
]];
752 LOG(4, s
, session
[s
].tunnel
, "Caching ip address %s/%d\n",
753 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
757 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
758 inet_ntop(AF_INET6
, &ip
, ipv6addr
,
764 // CLI list to dump current ipcache.
766 int cmd_show_ipcache(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
768 char **d
= (char **) ip_hash
, **e
, **f
, **g
;
772 if (CLI_HELP_REQUESTED
)
773 return CLI_HELP_NO_ARGS
;
775 cli_print(cli
, "%7s %s", "Sess#", "IP Address");
777 for (i
= 0; i
< 256; ++i
)
782 for (j
= 0; j
< 256; ++j
)
787 for (k
= 0; k
< 256; ++k
)
792 for (l
= 0; l
< 256; ++l
)
796 cli_print(cli
, "%7d %d.%d.%d.%d", (int) (intptr_t) g
[l
], i
, j
, k
, l
);
802 cli_print(cli
, "%d entries in cache", count
);
807 // Find session by username, 0 for not found
808 // walled garden users aren't authenticated, so the username is
809 // reasonably useless. Ignore them to avoid incorrect actions
811 // This is VERY inefficent. Don't call it often. :)
813 sessionidt
sessionbyuser(char *username
)
816 CSTAT(sessionbyuser
);
818 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
820 if (!session
[s
].opened
)
823 if (session
[s
].walled_garden
)
824 continue; // Skip walled garden users.
826 if (!strncmp(session
[s
].user
, username
, 128))
830 return 0; // Not found.
833 void send_garp(in_addr_t ip
)
839 s
= socket(PF_INET
, SOCK_DGRAM
, 0);
842 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno
));
845 memset(&ifr
, 0, sizeof(ifr
));
846 strncpy(ifr
.ifr_name
, "eth0", sizeof(ifr
.ifr_name
) - 1);
847 if (ioctl(s
, SIOCGIFHWADDR
, &ifr
) < 0)
849 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno
));
853 memcpy(mac
, &ifr
.ifr_hwaddr
.sa_data
, 6*sizeof(char));
854 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0)
856 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno
));
861 sendarp(ifr
.ifr_ifindex
, mac
, ip
);
864 static sessiont
*sessiontbysessionidt(sessionidt s
)
866 if (!s
|| s
>= MAXSESSION
) return NULL
;
870 static sessionidt
sessionidtbysessiont(sessiont
*s
)
872 sessionidt val
= s
-session
;
873 if (s
< session
|| val
>= MAXSESSION
) return 0;
877 // actually send a control message for a specific tunnel
878 void tunnelsend(uint8_t * buf
, uint16_t l
, tunnelidt t
)
880 struct sockaddr_in addr
;
886 static int backtrace_count
= 0;
887 LOG(0, 0, t
, "tunnelsend called with 0 as tunnel id\n");
888 STAT(tunnel_tx_errors
);
889 log_backtrace(backtrace_count
, 5)
895 static int backtrace_count
= 0;
896 LOG(1, 0, t
, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
897 log_backtrace(backtrace_count
, 5)
898 STAT(tunnel_tx_errors
);
902 memset(&addr
, 0, sizeof(addr
));
903 addr
.sin_family
= AF_INET
;
904 *(uint32_t *) & addr
.sin_addr
= htonl(tunnel
[t
].ip
);
905 addr
.sin_port
= htons(tunnel
[t
].port
);
907 // sequence expected, if sequence in message
908 if (*buf
& 0x08) *(uint16_t *) (buf
+ ((*buf
& 0x40) ? 10 : 8)) = htons(tunnel
[t
].nr
);
910 // If this is a control message, deal with retries
913 tunnel
[t
].last
= time_now
; // control message sent
914 tunnel
[t
].retry
= backoff(tunnel
[t
].try); // when to resend
915 if (tunnel
[t
].try > 1)
917 STAT(tunnel_retries
);
918 LOG(3, 0, t
, "Control message resend try %d\n", tunnel
[t
].try);
922 if (sendto(udpfd
, buf
, l
, 0, (void *) &addr
, sizeof(addr
)) < 0)
924 LOG(0, ntohs((*(uint16_t *) (buf
+ 6))), t
, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
925 strerror(errno
), udpfd
, buf
, l
, inet_ntoa(addr
.sin_addr
));
926 STAT(tunnel_tx_errors
);
930 LOG_HEX(5, "Send Tunnel Data", buf
, l
);
931 STAT(tunnel_tx_packets
);
932 INC_STAT(tunnel_tx_bytes
, l
);
936 // Tiny helper function to write data to
939 int tun_write(uint8_t * data
, int size
)
941 return write(tunfd
, data
, size
);
944 // process outgoing (to tunnel) IP
946 static void processipout(uint8_t * buf
, int len
)
953 char *data
= buf
; // Keep a copy of the originals.
956 uint8_t b
[MAXETHER
+ 20];
960 if (len
< MIN_IP_SIZE
)
962 LOG(1, 0, 0, "Short IP, %d bytes\n", len
);
968 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len
);
973 // Skip the tun header
977 // Got an IP header now
978 if (*(uint8_t *)(buf
) >> 4 != 4)
980 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
984 ip
= *(uint32_t *)(buf
+ 16);
985 if (!(s
= sessionbyip(ip
)))
987 // Is this a packet for a session that doesn't exist?
988 static int rate
= 0; // Number of ICMP packets we've sent this second.
989 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
991 if (last
!= time_now
)
997 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
999 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t
*)(buf
+ 12), 0));
1000 host_unreachable(*(in_addr_t
*)(buf
+ 12), *(uint16_t *)(buf
+ 4), ip
, buf
, (len
< 64) ? 64 : len
);
1004 t
= session
[s
].tunnel
;
1007 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1008 if (config
->max_packets
> 0)
1010 if (sess_local
[s
].last_packet_out
== TIME
)
1012 int max
= config
->max_packets
;
1014 // All packets for throttled sessions are handled by the
1015 // master, so further limit by using the throttle rate.
1016 // A bit of a kludge, since throttle rate is in kbps,
1017 // but should still be generous given our average DSL
1018 // packet size is 200 bytes: a limit of 28kbps equates
1019 // to around 180 packets per second.
1020 if (!config
->cluster_iam_master
&& sp
->throttle_out
&& sp
->throttle_out
< max
)
1021 max
= sp
->throttle_out
;
1023 if (++sess_local
[s
].packets_out
> max
)
1025 sess_local
[s
].packets_dropped
++;
1031 if (sess_local
[s
].packets_dropped
)
1033 INC_STAT(tun_rx_dropped
, sess_local
[s
].packets_dropped
);
1034 LOG(3, s
, t
, "Dropped %u/%u packets to %s for %suser %s\n",
1035 sess_local
[s
].packets_dropped
, sess_local
[s
].packets_out
,
1036 fmtaddr(ip
, 0), sp
->throttle_out
? "throttled " : "",
1040 sess_local
[s
].last_packet_out
= TIME
;
1041 sess_local
[s
].packets_out
= 1;
1042 sess_local
[s
].packets_dropped
= 0;
1046 // run access-list if any
1047 if (session
[s
].filter_out
&& !ip_filter(buf
, len
, session
[s
].filter_out
- 1))
1052 // Are we throttling this session?
1053 if (config
->cluster_iam_master
)
1054 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1056 master_throttle_packet(sp
->tbf_out
, data
, size
);
1059 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1061 // We are walled-gardening this
1062 master_garden_packet(s
, data
, size
);
1066 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1068 // Add on L2TP header
1070 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1072 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1075 // Snooping this session, send it to intercept box
1076 if (sp
->snoop_ip
&& sp
->snoop_port
)
1077 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1079 sp
->cout
+= len
; // byte count
1080 sp
->total_cout
+= len
; // byte count
1083 sess_local
[s
].cout
+= len
; // To send to master..
1086 // process outgoing (to tunnel) IPv6
1088 static void processipv6out(uint8_t * buf
, int len
)
1094 struct in6_addr ip6
;
1096 char *data
= buf
; // Keep a copy of the originals.
1099 uint8_t b
[MAXETHER
+ 20];
1101 CSTAT(processipv6out
);
1103 if (len
< MIN_IP_SIZE
)
1105 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len
);
1106 STAT(tunnel_tx_errors
);
1109 if (len
>= MAXETHER
)
1111 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len
);
1112 STAT(tunnel_tx_errors
);
1116 // Skip the tun header
1120 // Got an IP header now
1121 if (*(uint8_t *)(buf
) >> 4 != 6)
1123 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1127 ip6
= *(struct in6_addr
*)(buf
+24);
1128 s
= sessionbyipv6(ip6
);
1132 ip
= *(uint32_t *)(buf
+ 32);
1133 s
= sessionbyip(ip
);
1138 // Is this a packet for a session that doesn't exist?
1139 static int rate
= 0; // Number of ICMP packets we've sent this second.
1140 static int last
= 0; // Last time we reset the ICMP packet counter 'rate'.
1142 if (last
!= time_now
)
1148 if (rate
++ < config
->icmp_rate
) // Only send a max of icmp_rate per second.
1150 // FIXME: Should send icmp6 host unreachable
1154 t
= session
[s
].tunnel
;
1157 // FIXME: add DoS prevention/filters?
1161 // Are we throttling this session?
1162 if (config
->cluster_iam_master
)
1163 tbf_queue_packet(sp
->tbf_out
, data
, size
);
1165 master_throttle_packet(sp
->tbf_out
, data
, size
);
1168 else if (sp
->walled_garden
&& !config
->cluster_iam_master
)
1170 // We are walled-gardening this
1171 master_garden_packet(s
, data
, size
);
1175 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1177 // Add on L2TP header
1179 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIPV6
);
1181 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1184 // Snooping this session, send it to intercept box
1185 if (sp
->snoop_ip
&& sp
->snoop_port
)
1186 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1188 sp
->cout
+= len
; // byte count
1189 sp
->total_cout
+= len
; // byte count
1192 sess_local
[s
].cout
+= len
; // To send to master..
1196 // Helper routine for the TBF filters.
1197 // Used to send queued data in to the user!
1199 static void send_ipout(sessionidt s
, uint8_t *buf
, int len
)
1205 uint8_t b
[MAXETHER
+ 20];
1207 if (len
< 0 || len
> MAXETHER
)
1209 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len
);
1213 // Skip the tun header
1217 ip
= *(in_addr_t
*)(buf
+ 16);
1222 t
= session
[s
].tunnel
;
1225 LOG(5, s
, t
, "Ethernet -> Tunnel (%d bytes)\n", len
);
1227 // Add on L2TP header
1229 uint8_t *p
= makeppp(b
, sizeof(b
), buf
, len
, t
, s
, PPPIP
);
1231 tunnelsend(b
, len
+ (p
-b
), t
); // send it...
1234 // Snooping this session.
1235 if (sp
->snoop_ip
&& sp
->snoop_port
)
1236 snoop_send_packet(buf
, len
, sp
->snoop_ip
, sp
->snoop_port
);
1238 sp
->cout
+= len
; // byte count
1239 sp
->total_cout
+= len
; // byte count
1242 sess_local
[s
].cout
+= len
; // To send to master..
1245 // add an AVP (16 bit)
1246 static void control16(controlt
* c
, uint16_t avp
, uint16_t val
, uint8_t m
)
1248 uint16_t l
= (m
? 0x8008 : 0x0008);
1249 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1250 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1251 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1252 *(uint16_t *) (c
->buf
+ c
->length
+ 6) = htons(val
);
1256 // add an AVP (32 bit)
1257 static void control32(controlt
* c
, uint16_t avp
, uint32_t val
, uint8_t m
)
1259 uint16_t l
= (m
? 0x800A : 0x000A);
1260 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1261 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1262 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1263 *(uint32_t *) (c
->buf
+ c
->length
+ 6) = htonl(val
);
1267 // add an AVP (string)
1268 static void controls(controlt
* c
, uint16_t avp
, char *val
, uint8_t m
)
1270 uint16_t l
= ((m
? 0x8000 : 0) + strlen(val
) + 6);
1271 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1272 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1273 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1274 memcpy(c
->buf
+ c
->length
+ 6, val
, strlen(val
));
1275 c
->length
+= 6 + strlen(val
);
1279 static void controlb(controlt
* c
, uint16_t avp
, char *val
, unsigned int len
, uint8_t m
)
1281 uint16_t l
= ((m
? 0x8000 : 0) + len
+ 6);
1282 *(uint16_t *) (c
->buf
+ c
->length
+ 0) = htons(l
);
1283 *(uint16_t *) (c
->buf
+ c
->length
+ 2) = htons(0);
1284 *(uint16_t *) (c
->buf
+ c
->length
+ 4) = htons(avp
);
1285 memcpy(c
->buf
+ c
->length
+ 6, val
, len
);
1286 c
->length
+= 6 + len
;
1289 // new control connection
1290 static controlt
*controlnew(uint16_t mtype
)
1294 c
= malloc(sizeof(controlt
));
1298 controlfree
= c
->next
;
1302 *(uint16_t *) (c
->buf
+ 0) = htons(0xC802); // flags/ver
1304 control16(c
, 0, mtype
, 1);
1308 // send zero block if nothing is waiting
1310 static void controlnull(tunnelidt t
)
1313 if (tunnel
[t
].controlc
) // Messages queued; They will carry the ack.
1316 *(uint16_t *) (buf
+ 0) = htons(0xC802); // flags/ver
1317 *(uint16_t *) (buf
+ 2) = htons(12); // length
1318 *(uint16_t *) (buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1319 *(uint16_t *) (buf
+ 6) = htons(0); // session
1320 *(uint16_t *) (buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1321 *(uint16_t *) (buf
+ 10) = htons(tunnel
[t
].nr
); // sequence
1322 tunnelsend(buf
, 12, t
);
1325 // add a control message to a tunnel, and send if within window
1326 static void controladd(controlt
* c
, tunnelidt t
, sessionidt far
)
1328 *(uint16_t *) (c
->buf
+ 2) = htons(c
->length
); // length
1329 *(uint16_t *) (c
->buf
+ 4) = htons(tunnel
[t
].far
); // tunnel
1330 *(uint16_t *) (c
->buf
+ 6) = htons(far
); // session
1331 *(uint16_t *) (c
->buf
+ 8) = htons(tunnel
[t
].ns
); // sequence
1332 tunnel
[t
].ns
++; // advance sequence
1333 // link in message in to queue
1334 if (tunnel
[t
].controlc
)
1335 tunnel
[t
].controle
->next
= c
;
1337 tunnel
[t
].controls
= c
;
1339 tunnel
[t
].controle
= c
;
1340 tunnel
[t
].controlc
++;
1342 // send now if space in window
1343 if (tunnel
[t
].controlc
<= tunnel
[t
].window
)
1345 tunnel
[t
].try = 0; // first send
1346 tunnelsend(c
->buf
, c
->length
, t
);
1351 // Throttle or Unthrottle a session
1353 // Throttle the data from/to through a session to no more than
1354 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1357 // If either value is -1, the current value is retained for that
1360 void throttle_session(sessionidt s
, int rate_in
, int rate_out
)
1362 if (!session
[s
].opened
)
1363 return; // No-one home.
1365 if (!*session
[s
].user
)
1366 return; // User not logged in
1370 int bytes
= rate_in
* 1024 / 8; // kbits to bytes
1371 if (session
[s
].tbf_in
)
1372 free_tbf(session
[s
].tbf_in
);
1375 session
[s
].tbf_in
= new_tbf(s
, bytes
* 2, bytes
, send_ipin
);
1377 session
[s
].tbf_in
= 0;
1379 session
[s
].throttle_in
= rate_in
;
1384 int bytes
= rate_out
* 1024 / 8;
1385 if (session
[s
].tbf_out
)
1386 free_tbf(session
[s
].tbf_out
);
1389 session
[s
].tbf_out
= new_tbf(s
, bytes
* 2, bytes
, send_ipout
);
1391 session
[s
].tbf_out
= 0;
1393 session
[s
].throttle_out
= rate_out
;
1397 // add/remove filters from session (-1 = no change)
1398 static void filter_session(sessionidt s
, int filter_in
, int filter_out
)
1400 if (!session
[s
].opened
)
1401 return; // No-one home.
1403 if (!*session
[s
].user
)
1404 return; // User not logged in
1407 if (filter_in
> MAXFILTER
) filter_in
= -1;
1408 if (filter_out
> MAXFILTER
) filter_out
= -1;
1409 if (session
[s
].filter_in
> MAXFILTER
) session
[s
].filter_in
= 0;
1410 if (session
[s
].filter_out
> MAXFILTER
) session
[s
].filter_out
= 0;
1414 if (session
[s
].filter_in
)
1415 ip_filters
[session
[s
].filter_in
- 1].used
--;
1418 ip_filters
[filter_in
- 1].used
++;
1420 session
[s
].filter_in
= filter_in
;
1423 if (filter_out
>= 0)
1425 if (session
[s
].filter_out
)
1426 ip_filters
[session
[s
].filter_out
- 1].used
--;
1429 ip_filters
[filter_out
- 1].used
++;
1431 session
[s
].filter_out
= filter_out
;
1435 // start tidy shutdown of session
1436 void sessionshutdown(sessionidt s
, char *reason
, int result
, int error
)
1438 int walled_garden
= session
[s
].walled_garden
;
1441 CSTAT(sessionshutdown
);
1443 if (!session
[s
].opened
)
1445 LOG(3, s
, session
[s
].tunnel
, "Called sessionshutdown on an unopened session.\n");
1446 return; // not a live session
1449 if (!session
[s
].die
)
1451 struct param_kill_session data
= { &tunnel
[session
[s
].tunnel
], &session
[s
] };
1452 LOG(2, s
, session
[s
].tunnel
, "Shutting down session %d: %s\n", s
, reason
);
1453 run_plugins(PLUGIN_KILL_SESSION
, &data
);
1456 if (session
[s
].ip
&& !walled_garden
&& !session
[s
].die
)
1458 // RADIUS Stop message
1459 uint16_t r
= sess_local
[s
].radius
;
1465 // stop, if not already trying
1466 if (radius
[r
].state
!= RADIUSSTOP
)
1467 radiussend(r
, RADIUSSTOP
);
1470 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1472 // Save counters to dump to accounting file
1473 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1474 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1478 { // IP allocated, clear and unroute
1481 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1483 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1484 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1487 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1488 session
[s
].route
[r
].ip
= 0;
1491 if (session
[s
].ip_pool_index
== -1) // static ip
1493 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1499 // unroute IPv6, if setup
1500 if (session
[s
].flags
& SF_IPV6_ROUTED
)
1501 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1504 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1505 throttle_session(s
, 0, 0);
1509 controlt
*c
= controlnew(14); // sending CDN
1513 *(uint16_t *) buf
= htons(result
);
1514 *(uint16_t *) (buf
+2) = htons(error
);
1515 controlb(c
, 1, buf
, 4, 1);
1518 control16(c
, 1, result
, 1);
1520 control16(c
, 14, s
, 1); // assigned session (our end)
1521 controladd(c
, session
[s
].tunnel
, session
[s
].far
); // send the message
1524 if (!session
[s
].die
)
1525 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1527 // update filter refcounts
1528 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1529 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1531 cluster_send_session(s
);
1534 void sendipcp(tunnelidt t
, sessionidt s
)
1536 uint8_t buf
[MAXCONTROL
];
1537 uint16_t r
= sess_local
[s
].radius
;
1547 sessionshutdown(s
, "No free RADIUS sessions for IPCP", 3, 0);
1551 if (radius
[r
].state
!= RADIUSIPCP
)
1553 radius
[r
].state
= RADIUSIPCP
;
1557 radius
[r
].retry
= backoff(radius
[r
].try++);
1558 if (radius
[r
].try > 10)
1560 radiusclear(r
, s
); // Clear radius session.
1561 sessionshutdown(s
, "No reply to IPCP.", 3, 0);
1565 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1569 q
[1] = r
<< RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1570 *(uint16_t *) (q
+ 2) = htons(10);
1573 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1574 config
->bind_address
? config
->bind_address
:
1575 my_address
; // send my IP
1577 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1578 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1580 // If we have an IPv6 prefix length configured, assume we should
1581 // try to negotiate an IPv6 session as well. Unless we've had a
1582 // (N)ACK for IPV6CP.
1583 if (config
->ipv6_prefix
.s6_addr
[0] > 0 &&
1584 !(session
[s
].flags
& SF_IPV6CP_ACKED
) &&
1585 !(session
[s
].flags
& SF_IPV6_NACKED
))
1587 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1591 q
[1] = r
<< RADIUS_SHIFT
; // ID, don't care, we
1592 // only send one type
1594 *(uint16_t *) (q
+ 2) = htons(14);
1597 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1598 *(uint32_t *) (q
+ 10) = 0;
1601 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1605 static void sessionclear(sessionidt s
)
1607 memset(&session
[s
], 0, sizeof(session
[s
]));
1608 memset(&sess_local
[s
], 0, sizeof(sess_local
[s
]));
1609 memset(&cli_session_actions
[s
], 0, sizeof(cli_session_actions
[s
]));
1611 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1612 session
[s
].next
= sessionfree
;
1616 // kill a session now
1617 void sessionkill(sessionidt s
, char *reason
)
1622 if (!session
[s
].opened
) // not alive
1625 if (session
[s
].next
)
1627 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1631 session
[s
].die
= TIME
;
1632 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1633 if (sess_local
[s
].radius
)
1634 radiusclear(sess_local
[s
].radius
, s
); // cant send clean accounting data, session is killed
1636 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1638 cluster_send_session(s
);
1641 static void tunnelclear(tunnelidt t
)
1644 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1645 tunnel
[t
].state
= TUNNELFREE
;
1648 // kill a tunnel now
1649 static void tunnelkill(tunnelidt t
, char *reason
)
1656 tunnel
[t
].state
= TUNNELDIE
;
1658 // free control messages
1659 while ((c
= tunnel
[t
].controls
))
1661 controlt
* n
= c
->next
;
1662 tunnel
[t
].controls
= n
;
1663 tunnel
[t
].controlc
--;
1664 c
->next
= controlfree
;
1668 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1669 if (session
[s
].tunnel
== t
)
1670 sessionkill(s
, reason
);
1674 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1675 cli_tunnel_actions
[t
].action
= 0;
1676 cluster_send_tunnel(t
);
1679 // shut down a tunnel cleanly
1680 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1684 CSTAT(tunnelshutdown
);
1686 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1688 // never set up, can immediately kill
1689 tunnelkill(t
, reason
);
1692 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1695 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1696 if (session
[s
].tunnel
== t
)
1697 sessionshutdown(s
, reason
, 3, 0);
1699 tunnel
[t
].state
= TUNNELDIE
;
1700 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1701 cluster_send_tunnel(t
);
1702 // TBA - should we wait for sessions to stop?
1705 controlt
*c
= controlnew(4); // sending StopCCN
1710 *(uint16_t *) buf
= htons(result
);
1711 *(uint16_t *) (buf
+2) = htons(error
);
1714 int m
= strlen(msg
);
1715 if (m
+ 4 > sizeof(buf
))
1716 m
= sizeof(buf
) - 4;
1718 memcpy(buf
+4, msg
, m
);
1722 controlb(c
, 1, buf
, l
, 1);
1725 control16(c
, 1, result
, 1);
1727 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1728 controladd(c
, t
, 0); // send the message
1732 // read and process packet on tunnel (UDP)
1733 void processudp(uint8_t * buf
, int len
, struct sockaddr_in
*addr
)
1735 char *chapresponse
= NULL
;
1736 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1737 uint8_t *p
= buf
+ 2;
1744 LOG_HEX(5, "UDP Data", buf
, len
);
1745 STAT(tunnel_rx_packets
);
1746 INC_STAT(tunnel_rx_bytes
, len
);
1749 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1750 STAT(tunnel_rx_errors
);
1753 if ((buf
[1] & 0x0F) != 2)
1755 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1756 STAT(tunnel_rx_errors
);
1761 l
= ntohs(*(uint16_t *) p
);
1764 t
= ntohs(*(uint16_t *) p
);
1766 s
= ntohs(*(uint16_t *) p
);
1768 if (s
>= MAXSESSION
)
1770 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1771 STAT(tunnel_rx_errors
);
1776 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1777 STAT(tunnel_rx_errors
);
1782 ns
= ntohs(*(uint16_t *) p
);
1784 nr
= ntohs(*(uint16_t *) p
);
1789 uint16_t o
= ntohs(*(uint16_t *) p
);
1794 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1795 STAT(tunnel_rx_errors
);
1801 uint16_t message
= 0xFFFF; // message type
1803 uint8_t mandatory
= 0;
1804 uint8_t authtype
= 0; // proxy auth type
1805 uint16_t asession
= 0; // assigned session
1806 uint32_t amagic
= 0; // magic number
1807 uint8_t aflags
= 0; // flags from last LCF
1808 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1809 char called
[MAXTEL
] = ""; // called number
1810 char calling
[MAXTEL
] = ""; // calling number
1812 if (!config
->cluster_iam_master
)
1814 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1818 // control messages must have bits 0x80|0x40|0x08
1819 // (type, length and sequence) set, and bits 0x02|0x01
1820 // (offset and priority) clear
1821 if ((*buf
& 0xCB) != 0xC8)
1823 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1824 STAT(tunnel_rx_errors
);
1828 // check for duplicate tunnel open message
1834 // Is this a duplicate of the first packet? (SCCRQ)
1836 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1838 if (tunnel
[i
].state
!= TUNNELOPENING
||
1839 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1840 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1843 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1848 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1849 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1851 // if no tunnel specified, assign one
1854 if (!(t
= new_tunnel()))
1856 LOG(1, 0, 0, "No more tunnels\n");
1857 STAT(tunnel_overflow
);
1861 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1862 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1863 tunnel
[t
].window
= 4; // default window
1864 STAT(tunnel_created
);
1865 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1866 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1869 // If the 'ns' just received is not the 'nr' we're
1870 // expecting, just send an ack and drop it.
1872 // if 'ns' is less, then we got a retransmitted packet.
1873 // if 'ns' is greater than missed a packet. Either way
1874 // we should ignore it.
1875 if (ns
!= tunnel
[t
].nr
)
1877 // is this the sequence we were expecting?
1878 STAT(tunnel_rx_errors
);
1879 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1880 t
, ns
, tunnel
[t
].nr
);
1882 if (l
) // Is this not a ZLB?
1887 // This is used to time out old tunnels
1888 tunnel
[t
].lastrec
= time_now
;
1890 // check sequence of this message
1892 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1893 // some to clear maybe?
1894 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1896 controlt
*c
= tunnel
[t
].controls
;
1897 tunnel
[t
].controls
= c
->next
;
1898 tunnel
[t
].controlc
--;
1899 c
->next
= controlfree
;
1902 tunnel
[t
].try = 0; // we have progress
1905 // receiver advance (do here so quoted correctly in any sends below)
1906 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1907 if (skip
< 0) skip
= 0;
1908 if (skip
< tunnel
[t
].controlc
)
1910 // some control packets can now be sent that were previous stuck out of window
1911 int tosend
= tunnel
[t
].window
- skip
;
1912 controlt
*c
= tunnel
[t
].controls
;
1920 tunnel
[t
].try = 0; // first send
1921 tunnelsend(c
->buf
, c
->length
, t
);
1926 if (!tunnel
[t
].controlc
)
1927 tunnel
[t
].retry
= 0; // caught up
1930 { // if not a null message
1936 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1938 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1944 LOG(1, s
, t
, "Invalid length in AVP\n");
1945 STAT(tunnel_rx_errors
);
1950 if (flags
& 0x3C) // reserved bits, should be clear
1952 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1954 result
= 2; // general error
1955 error
= 3; // reserved field non-zero
1960 if (*(uint16_t *) (b
))
1962 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1964 result
= 2; // general error
1965 error
= 6; // generic vendor-specific error
1966 msg
= "unsupported vendor-specific";
1970 mtype
= ntohs(*(uint16_t *) (b
));
1978 // handle hidden AVPs
1979 if (!*config
->l2tpsecret
)
1981 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1983 result
= 2; // general error
1984 error
= 6; // generic vendor-specific error
1985 msg
= "secret not specified";
1988 if (!session
[s
].random_vector_length
)
1990 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
1992 result
= 2; // general error
1993 error
= 6; // generic
1994 msg
= "no random vector";
1999 LOG(2, s
, t
, "Short hidden AVP.\n");
2001 result
= 2; // general error
2002 error
= 2; // length is wrong
2007 LOG(4, s
, t
, "Hidden AVP\n");
2010 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2012 orig_len
= ntohs(*(uint16_t *) b
);
2013 if (orig_len
> n
+ 2)
2015 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2019 result
= 2; // general error
2020 error
= 2; // length is wrong
2029 LOG(4, s
, t
, " AVP %d (%s) len %d\n", mtype
, avp_name(mtype
), n
);
2032 case 0: // message type
2033 message
= ntohs(*(uint16_t *) b
);
2034 mandatory
= flags
& 0x80;
2035 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_message_type(message
));
2037 case 1: // result code
2039 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2040 const char* resdesc
= "(unknown)";
2043 resdesc
= stopccn_result_code(rescode
);
2045 else if (message
== 14)
2047 resdesc
= cdn_result_code(rescode
);
2050 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2053 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2054 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, error_code(errcode
));
2057 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2062 case 2: // protocol version
2064 version
= ntohs(*(uint16_t *) (b
));
2065 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2066 if (version
&& version
!= 0x0100)
2067 { // allow 0.0 and 1.0
2068 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2070 result
= 5; // unspported protocol version
2071 error
= 0x0100; // supported version
2077 case 3: // framing capabilities
2078 // LOG(4, s, t, "Framing capabilities\n");
2080 case 4: // bearer capabilities
2081 // LOG(4, s, t, "Bearer capabilities\n");
2083 case 5: // tie breaker
2084 // We never open tunnels, so we don't care about tie breakers
2085 // LOG(4, s, t, "Tie breaker\n");
2087 case 6: // firmware revision
2088 // LOG(4, s, t, "Firmware revision\n");
2090 case 7: // host name
2091 memset(tunnel
[t
].hostname
, 0, sizeof(tunnel
[t
].hostname
));
2092 memcpy(tunnel
[t
].hostname
, b
, (n
< sizeof(tunnel
[t
].hostname
)) ? n
: sizeof(tunnel
[t
].hostname
) - 1);
2093 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2094 // TBA - to send to RADIUS
2096 case 8: // vendor name
2097 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2098 memcpy(tunnel
[t
].vendor
, b
, (n
< sizeof(tunnel
[t
].vendor
)) ? n
: sizeof(tunnel
[t
].vendor
) - 1);
2099 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2101 case 9: // assigned tunnel
2102 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2103 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2105 case 10: // rx window
2106 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2107 if (!tunnel
[t
].window
)
2108 tunnel
[t
].window
= 1; // window of 0 is silly
2109 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2111 case 11: // Challenge
2113 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2114 build_chap_response(b
, 2, n
, &chapresponse
);
2117 case 13: // Response
2118 // Why did they send a response? We never challenge.
2119 LOG(2, s
, t
, " received unexpected challenge response\n");
2122 case 14: // assigned session
2123 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2124 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2126 case 15: // call serial number
2127 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2129 case 18: // bearer type
2130 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2133 case 19: // framing type
2134 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2137 case 21: // called number
2138 memset(called
, 0, sizeof(called
));
2139 memcpy(called
, b
, (n
< sizeof(called
)) ? n
: sizeof(called
) - 1);
2140 LOG(4, s
, t
, " Called <%s>\n", called
);
2142 case 22: // calling number
2143 memset(calling
, 0, sizeof(calling
));
2144 memcpy(calling
, b
, (n
< sizeof(calling
)) ? n
: sizeof(calling
) - 1);
2145 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2149 case 24: // tx connect speed
2152 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2156 // AS5300s send connect speed as a string
2158 memset(tmp
, 0, sizeof(tmp
));
2159 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2160 session
[s
].tx_connect_speed
= atol(tmp
);
2162 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2164 case 38: // rx connect speed
2167 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2171 // AS5300s send connect speed as a string
2173 memset(tmp
, 0, sizeof(tmp
));
2174 memcpy(tmp
, b
, (n
< sizeof(tmp
)) ? n
: sizeof(tmp
) - 1);
2175 session
[s
].rx_connect_speed
= atol(tmp
);
2177 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2179 case 25: // Physical Channel ID
2181 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2182 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2185 case 29: // Proxy Authentication Type
2187 uint16_t atype
= ntohs(*(uint16_t *)b
);
2188 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, auth_type(atype
));
2190 authtype
= AUTHCHAP
;
2191 else if (atype
== 3)
2196 case 30: // Proxy Authentication Name
2199 memset(authname
, 0, sizeof(authname
));
2200 memcpy(authname
, b
, (n
< sizeof(authname
)) ? n
: sizeof(authname
) - 1);
2201 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2205 case 31: // Proxy Authentication Challenge
2207 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2208 if (sess_local
[s
].radius
)
2209 memcpy(radius
[sess_local
[s
].radius
].auth
, b
, 16);
2212 case 32: // Proxy Authentication ID
2214 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2215 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2216 if (sess_local
[s
].radius
)
2217 radius
[sess_local
[s
].radius
].id
= authid
;
2220 case 33: // Proxy Authentication Response
2221 LOG(4, s
, t
, " Proxy Auth Response\n");
2223 case 27: // last sent lcp
2224 { // find magic number
2225 uint8_t *p
= b
, *e
= p
+ n
;
2226 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2228 if (*p
== 5 && p
[1] == 6) // Magic-Number
2229 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2230 else if (*p
== 3 && p
[1] == 4 && *(uint16_t *) (p
+ 2) == htons(PPPPAP
)) // Authentication-Protocol (PAP)
2232 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol (CHAP)
2233 authtype
= AUTHCHAP
;
2234 else if (*p
== 7) // Protocol-Field-Compression
2235 aflags
|= SESSIONPFC
;
2236 else if (*p
== 8) // Address-and-Control-Field-Compression
2237 aflags
|= SESSIONACFC
;
2242 case 28: // last recv lcp confreq
2244 case 26: // Initial Received LCP CONFREQ
2246 case 39: // seq required - we control it as an LNS anyway...
2248 case 36: // Random Vector
2249 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2250 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2251 memcpy(session
[s
].random_vector
, b
, n
);
2252 session
[s
].random_vector_length
= n
;
2256 static char e
[] = "unknown AVP 0xXXXX";
2257 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2259 result
= 2; // general error
2260 error
= 8; // unknown mandatory AVP
2261 sprintf((msg
= e
) + 14, "%04x", mtype
);
2268 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2272 case 1: // SCCRQ - Start Control Connection Request
2274 controlt
*c
= controlnew(2); // sending SCCRP
2275 control16(c
, 2, version
, 1); // protocol version
2276 control32(c
, 3, 3, 1); // framing
2277 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2278 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2279 control16(c
, 9, t
, 1); // assigned tunnel
2280 controladd(c
, t
, 0); // send the resply
2282 tunnel
[t
].state
= TUNNELOPENING
;
2285 tunnel
[t
].state
= TUNNELOPEN
;
2288 tunnel
[t
].state
= TUNNELOPEN
;
2289 controlnull(t
); // ack
2292 controlnull(t
); // ack
2293 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2296 controlnull(t
); // simply ACK
2313 sessionfree
= session
[s
].next
;
2314 memset(&session
[s
], 0, sizeof(session
[s
]));
2316 if (s
> config
->cluster_highest_sessionid
)
2317 config
->cluster_highest_sessionid
= s
;
2319 // make a RADIUS session
2320 if ((r
= radiusnew(s
)))
2322 controlt
*c
= controlnew(11); // sending ICRP
2323 session
[s
].opened
= time_now
;
2324 session
[s
].tunnel
= t
;
2325 session
[s
].far
= asession
;
2326 session
[s
].last_packet
= time_now
;
2327 LOG(3, s
, t
, "New session (%d/%d)\n", tunnel
[t
].far
, session
[s
].far
);
2328 control16(c
, 14, s
, 1); // assigned session
2329 controladd(c
, t
, asession
); // send the reply
2331 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
2332 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2333 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2334 STAT(session_created
);
2339 LOG(1, s
, t
, "No free RADIUS sessions for ICRQ\n");
2344 STAT(session_overflow
);
2345 LOG(1, 0, t
, "No free sessions\n");
2349 controlt
*c
= controlnew(14); // CDN
2350 control16(c
, 1, 4, 1); // temporary lack of resources
2351 controladd(c
, session
[s
].tunnel
, asession
); // send the message
2358 if (amagic
== 0) amagic
= time_now
;
2359 session
[s
].magic
= amagic
; // set magic number
2360 session
[s
].l2tp_flags
= aflags
; // set flags received
2361 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2362 controlnull(t
); // ack
2363 // proxy authentication type is not supported
2364 if (!(config
->radius_authtypes
& authtype
))
2365 authtype
= config
->radius_authprefer
;
2368 sendlcp(t
, s
, authtype
);
2371 controlnull(t
); // ack
2372 sessionshutdown(s
, "Closed (Received CDN).", 0, 0);
2375 LOG(1, s
, t
, "Missing message type\n");
2378 STAT(tunnel_rx_errors
);
2380 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2382 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2385 if (chapresponse
) free(chapresponse
);
2386 cluster_send_tunnel(t
);
2390 LOG(4, s
, t
, " Got a ZLB ack\n");
2397 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2398 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2399 { // HDLC address header, discard
2405 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2406 STAT(tunnel_rx_errors
);
2416 prot
= ntohs(*(uint16_t *) p
);
2421 if (s
&& !session
[s
].opened
) // Is something wrong??
2423 if (!config
->cluster_iam_master
)
2425 // Pass it off to the master to deal with..
2426 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2431 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2432 STAT(tunnel_rx_errors
);
2438 session
[s
].last_packet
= time_now
;
2439 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2440 processpap(t
, s
, p
, l
);
2442 else if (prot
== PPPCHAP
)
2444 session
[s
].last_packet
= time_now
;
2445 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2446 processchap(t
, s
, p
, l
);
2448 else if (prot
== PPPLCP
)
2450 session
[s
].last_packet
= time_now
;
2451 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2452 processlcp(t
, s
, p
, l
);
2454 else if (prot
== PPPIPCP
)
2456 session
[s
].last_packet
= time_now
;
2457 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2458 processipcp(t
, s
, p
, l
);
2460 else if (prot
== PPPIPV6CP
)
2462 if (config
->ipv6_prefix
.s6_addr
[0] > 0)
2464 session
[s
].last_packet
= time_now
;
2465 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2466 processipv6cp(t
, s
, p
, l
);
2470 LOG(1, s
, t
, "IPv6 not configured; ignoring IPv6CP\n");
2473 else if (prot
== PPPCCP
)
2475 session
[s
].last_packet
= time_now
;
2476 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2477 processccp(t
, s
, p
, l
);
2479 else if (prot
== PPPIP
)
2483 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2484 return; // closing session, PPP not processed
2487 session
[s
].last_packet
= time_now
;
2488 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2490 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2494 processipin(t
, s
, p
, l
);
2496 else if (prot
== PPPIPV6
)
2498 if (!config
->ipv6_prefix
.s6_addr
[0] > 0)
2500 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2505 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2506 return; // closing session, PPP not processed
2509 session
[s
].last_packet
= time_now
;
2510 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2512 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2516 processipv6in(t
, s
, p
, l
);
2520 STAT(tunnel_rx_errors
);
2521 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2526 // read and process packet on tun
2527 static void processtun(uint8_t * buf
, int len
)
2529 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2530 STAT(tun_rx_packets
);
2531 INC_STAT(tun_rx_bytes
, len
);
2539 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2540 STAT(tun_rx_errors
);
2544 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2545 processipout(buf
, len
);
2546 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2547 && config
->ipv6_prefix
.s6_addr
[0] > 0)
2548 processipv6out(buf
, len
);
2554 // Maximum number of actions to complete.
2555 // This is to avoid sending out too many packets
2557 #define MAX_ACTIONS 500
2559 static int regular_cleanups(void)
2561 static sessionidt s
= 0; // Next session to check for actions on.
2565 static clockt next_acct
= 0;
2566 static clockt next_shut_acct
= 0;
2569 LOG(3, 0, 0, "Begin regular cleanup\n");
2571 for (r
= 1; r
< MAXRADIUS
; r
++)
2573 if (!radius
[r
].state
)
2575 if (radius
[r
].retry
)
2577 if (radius
[r
].retry
<= TIME
)
2580 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
2582 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
2584 // check for expired tunnels
2585 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2587 STAT(tunnel_timeout
);
2588 tunnelkill(t
, "Expired");
2591 // check for message resend
2592 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2594 // resend pending messages as timeout on reply
2595 if (tunnel
[t
].retry
<= TIME
)
2597 controlt
*c
= tunnel
[t
].controls
;
2598 uint8_t w
= tunnel
[t
].window
;
2599 tunnel
[t
].try++; // another try
2600 if (tunnel
[t
].try > 5)
2601 tunnelkill(t
, "Timeout on control message"); // game over
2605 tunnelsend(c
->buf
, c
->length
, t
);
2611 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2613 controlt
*c
= controlnew(6); // sending HELLO
2614 controladd(c
, t
, 0); // send the message
2615 LOG(3, 0, t
, "Sending HELLO message\n");
2618 // Check for tunnel changes requested from the CLI
2619 if ((a
= cli_tunnel_actions
[t
].action
))
2621 cli_tunnel_actions
[t
].action
= 0;
2622 if (a
& CLI_TUN_KILL
)
2624 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2625 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2632 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2635 if (s
> config
->cluster_highest_sessionid
)
2638 if (!session
[s
].opened
) // Session isn't in use
2641 // check for expired sessions
2644 if (session
[s
].die
<= TIME
)
2646 sessionkill(s
, "Expired");
2647 if (++count
>= MAX_ACTIONS
) break;
2652 if (session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2654 // IPCP has not completed yet. Resend
2655 LOG(3, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2656 sendipcp(session
[s
].tunnel
, s
);
2659 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2660 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2662 sessionshutdown(s
, "No response to LCP ECHO requests.", 3, 0);
2663 STAT(session_timeout
);
2664 if (++count
>= MAX_ACTIONS
) break;
2668 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2669 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2671 uint8_t b
[MAXCONTROL
] = {0};
2673 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2677 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2678 *(uint16_t *)(q
+ 2) = htons(8); // Length
2679 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2681 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2682 (int)(time_now
- session
[s
].last_packet
));
2683 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2684 if (++count
>= MAX_ACTIONS
) break;
2687 // Check for actions requested from the CLI
2688 if ((a
= cli_session_actions
[s
].action
))
2692 cli_session_actions
[s
].action
= 0;
2693 if (a
& CLI_SESS_KILL
)
2695 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2696 sessionshutdown(s
, "Requested by administrator.", 3, 0);
2697 a
= 0; // dead, no need to check for other actions
2700 if (a
& CLI_SESS_NOSNOOP
)
2702 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2703 session
[s
].snoop_ip
= 0;
2704 session
[s
].snoop_port
= 0;
2707 else if (a
& CLI_SESS_SNOOP
)
2709 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2710 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2711 cli_session_actions
[s
].snoop_port
);
2713 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2714 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2718 if (a
& CLI_SESS_NOTHROTTLE
)
2720 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2721 throttle_session(s
, 0, 0);
2724 else if (a
& CLI_SESS_THROTTLE
)
2726 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2727 cli_session_actions
[s
].throttle_in
,
2728 cli_session_actions
[s
].throttle_out
);
2730 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2734 if (a
& CLI_SESS_NOFILTER
)
2736 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2737 filter_session(s
, 0, 0);
2740 else if (a
& CLI_SESS_FILTER
)
2742 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2743 cli_session_actions
[s
].filter_in
,
2744 cli_session_actions
[s
].filter_out
);
2746 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2751 cluster_send_session(s
);
2753 if (++count
>= MAX_ACTIONS
) break;
2756 // RADIUS interim accounting
2757 if (config
->radius_accounting
&& config
->radius_interim
> 0
2758 && session
[s
].ip
&& !session
[s
].walled_garden
2759 && !sess_local
[s
].radius
// RADIUS already in progress
2760 && time_now
- sess_local
[s
].last_interim
>= config
->radius_interim
)
2762 if (!(r
= radiusnew(s
)))
2764 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Interim message\n");
2765 STAT(radius_overflow
);
2769 LOG(3, s
, session
[s
].tunnel
, "Sending RADIUS Interim for %s (%u)\n",
2770 session
[s
].user
, session
[s
].unique_id
);
2772 radiussend(r
, RADIUSINTERIM
);
2773 sess_local
[s
].last_interim
= time_now
;
2775 if (++count
>= MAX_ACTIONS
)
2780 if (*config
->accounting_dir
)
2782 if (next_acct
<= TIME
)
2784 // Dump accounting data
2785 next_acct
= TIME
+ ACCT_TIME
;
2786 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2789 else if (next_shut_acct
<= TIME
)
2791 // Dump accounting data for shutdown sessions
2792 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2798 if (count
>= MAX_ACTIONS
)
2799 return 1; // Didn't finish!
2801 LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2807 // Are we in the middle of a tunnel update, or radius
2810 static int still_busy(void)
2813 static clockt last_talked
= 0;
2814 static clockt start_busy_wait
= 0;
2815 if (start_busy_wait
== 0)
2816 start_busy_wait
= TIME
;
2818 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2820 if (!tunnel
[i
].controlc
)
2823 if (last_talked
!= TIME
)
2825 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
2831 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2832 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2834 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2838 for (i
= 1; i
< MAXRADIUS
; i
++)
2840 if (radius
[i
].state
== RADIUSNULL
)
2842 if (radius
[i
].state
== RADIUSWAIT
)
2845 if (last_talked
!= TIME
)
2847 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2856 static fd_set readset
;
2857 static int readset_n
= 0;
2859 // main loop - gets packets on tun or udp and processes them
2860 static void mainloop(void)
2865 clockt next_cluster_ping
= 0; // send initial ping immediately
2866 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2868 LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2869 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2872 FD_SET(udpfd
, &readset
);
2873 FD_SET(tunfd
, &readset
);
2874 FD_SET(controlfd
, &readset
);
2875 FD_SET(clifd
, &readset
);
2876 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2878 if (tunfd
> readset_n
) readset_n
= tunfd
;
2879 if (controlfd
> readset_n
) readset_n
= controlfd
;
2880 if (clifd
> readset_n
) readset_n
= clifd
;
2881 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2883 while (!main_quit
|| still_busy())
2889 int bgp_set
[BGP_NUM_PEERS
];
2892 if (config
->reload_config
)
2894 // Update the config state based on config settings
2898 memcpy(&r
, &readset
, sizeof(fd_set
));
2900 to
.tv_usec
= 100000; // 1/10th of a second.
2904 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2906 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2909 FD_SET(bgp_peers
[i
].sock
, &r
);
2910 if (bgp_peers
[i
].sock
> n
)
2911 n
= bgp_peers
[i
].sock
;
2916 FD_SET(bgp_peers
[i
].sock
, &w
);
2917 if (bgp_peers
[i
].sock
> n
)
2918 n
= bgp_peers
[i
].sock
;
2922 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2924 n
= select(n
+ 1, &r
, 0, 0, &to
);
2927 STAT(select_called
);
2932 if (errno
== EINTR
||
2933 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2936 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2942 struct sockaddr_in addr
;
2946 int cluster_pkts
= 0;
2949 if (FD_ISSET(controlfd
, &r
))
2951 alen
= sizeof(addr
);
2952 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
2957 if (config
->cluster_iam_master
)
2959 for (i
= 0; i
< config
->num_radfds
; i
++)
2961 if (FD_ISSET(radfds
[i
], &r
))
2963 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2970 if (FD_ISSET(clifd
, &r
))
2974 alen
= sizeof(addr
);
2975 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
2981 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
2987 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2989 int isr
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0;
2990 int isw
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0;
2991 bgp_process(&bgp_peers
[i
], isr
, isw
);
2997 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
3000 if (FD_ISSET(udpfd
, &r
))
3002 alen
= sizeof(addr
);
3003 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
3005 processudp(buf
, s
, &addr
);
3016 if (FD_ISSET(tunfd
, &r
))
3018 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
3031 if (FD_ISSET(cluster_sockfd
, &r
))
3033 alen
= sizeof(addr
);
3034 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
3036 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
3041 FD_CLR(cluster_sockfd
, &r
);
3047 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3048 STAT(multi_read_used
);
3050 if (c
>= config
->multi_read_count
)
3052 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3053 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3055 STAT(multi_read_exceeded
);
3059 // Runs on every machine (master and slaves).
3060 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
3062 // Check to see which of the cluster is still alive..
3064 cluster_send_ping(basetime
); // Only does anything if we're a slave
3065 cluster_check_master(); // ditto.
3067 cluster_heartbeat(); // Only does anything if we're a master.
3068 cluster_check_slaves(); // ditto.
3070 master_update_counts(); // If we're a slave, send our byte counters to our master.
3072 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3073 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3075 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3078 // Run token bucket filtering queue..
3079 // Only run it every 1/10th of a second.
3080 // Runs on all machines both master and slave.
3082 static clockt last_run
= 0;
3083 if (last_run
!= TIME
)
3090 /* Handle timeouts. Make sure that this gets run anyway, even if there was
3091 * something to read, else under load this will never actually run....
3094 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
3096 if (regular_cleanups())
3099 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
3103 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
3108 // Are we the master and shutting down??
3109 if (config
->cluster_iam_master
)
3110 cluster_heartbeat(); // Flush any queued changes..
3112 // Ok. Notify everyone we're shutting down. If we're
3113 // the master, this will force an election.
3114 cluster_send_ping(0);
3117 // Important!!! We MUST not process any packets past this point!
3120 static void stripdomain(char *host
)
3124 if ((p
= strchr(host
, '.')))
3130 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3136 while (fgets(buf
, sizeof(buf
), resolv
))
3138 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3141 if (!isspace(buf
[6]))
3145 while (isspace(*b
)) b
++;
3150 while (*b
&& !isspace(*b
)) b
++;
3152 if (buf
[0] == 'd') // domain is canonical
3158 // first search line
3161 // hold, may be subsequent domain line
3162 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3173 int hl
= strlen(host
);
3174 int dl
= strlen(domain
);
3175 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3176 host
[hl
-dl
- 1] = 0;
3180 *p
= 0; // everything after first dot
3185 // Init data structures
3186 static void initdata(int optdebug
, char *optconfig
)
3190 if (!(config
= shared_malloc(sizeof(configt
))))
3192 fprintf(stderr
, "Error doing malloc for configuration: %s\n", strerror(errno
));
3196 memset(config
, 0, sizeof(configt
));
3197 time(&config
->start_time
);
3198 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3199 config
->debug
= optdebug
;
3200 config
->num_tbfs
= MAXTBFS
;
3201 config
->rl_rate
= 28; // 28kbps
3202 strcpy(config
->random_device
, RANDOMDEVICE
);
3204 log_stream
= stderr
;
3207 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3209 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3212 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3215 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3217 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3220 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3222 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3225 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3227 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3231 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3233 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3237 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3239 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3243 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3245 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3249 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3251 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3254 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3256 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3258 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3261 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3263 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3265 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3268 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3270 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3271 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3272 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3273 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3275 // Put all the sessions on the free list marked as undefined.
3276 for (i
= 1; i
< MAXSESSION
; i
++)
3278 session
[i
].next
= i
+ 1;
3279 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3281 session
[MAXSESSION
- 1].next
= 0;
3284 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3285 for (i
= 1; i
< MAXTUNNEL
; i
++)
3286 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3290 // Grab my hostname unless it's been specified
3291 gethostname(hostname
, sizeof(hostname
));
3292 stripdomain(hostname
);
3295 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3298 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3300 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3306 static int assign_ip_address(sessionidt s
)
3310 time_t best_time
= time_now
;
3311 char *u
= session
[s
].user
;
3315 CSTAT(assign_ip_address
);
3317 for (i
= 1; i
< ip_pool_size
; i
++)
3319 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3322 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3329 if (ip_address_pool
[i
].last
< best_time
)
3332 if (!(best_time
= ip_address_pool
[i
].last
))
3333 break; // never used, grab this one
3339 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3343 session
[s
].ip
= ip_address_pool
[best
].address
;
3344 session
[s
].ip_pool_index
= best
;
3345 ip_address_pool
[best
].assigned
= 1;
3346 ip_address_pool
[best
].last
= time_now
;
3347 ip_address_pool
[best
].session
= s
;
3348 if (session
[s
].walled_garden
)
3349 /* Don't track addresses of users in walled garden (note: this
3350 means that their address isn't "sticky" even if they get
3352 ip_address_pool
[best
].user
[0] = 0;
3354 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3357 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3358 reuse
? "Reusing" : "Allocating", best
);
3363 static void free_ip_address(sessionidt s
)
3365 int i
= session
[s
].ip_pool_index
;
3368 CSTAT(free_ip_address
);
3371 return; // what the?
3373 if (i
< 0) // Is this actually part of the ip pool?
3377 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3379 ip_address_pool
[i
].assigned
= 0;
3380 ip_address_pool
[i
].session
= 0;
3381 ip_address_pool
[i
].last
= time_now
;
3385 // Fsck the address pool against the session table.
3386 // Normally only called when we become a master.
3388 // This isn't perfect: We aren't keep tracking of which
3389 // users used to have an IP address.
3391 void rebuild_address_pool(void)
3396 // Zero the IP pool allocation, and build
3397 // a map from IP address to pool index.
3398 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3400 ip_address_pool
[i
].assigned
= 0;
3401 ip_address_pool
[i
].session
= 0;
3402 if (!ip_address_pool
[i
].address
)
3405 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3408 for (i
= 0; i
< MAXSESSION
; ++i
)
3411 if (!(session
[i
].opened
&& session
[i
].ip
))
3414 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3416 if (session
[i
].ip_pool_index
< 0)
3418 // Not allocated out of the pool.
3419 if (ipid
< 1) // Not found in the pool either? good.
3422 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3423 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3425 // Fall through and process it as part of the pool.
3429 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3431 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3433 session
[i
].ip_pool_index
= ipid
;
3437 ip_address_pool
[ipid
].assigned
= 1;
3438 ip_address_pool
[ipid
].session
= i
;
3439 ip_address_pool
[ipid
].last
= time_now
;
3440 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3441 session
[i
].ip_pool_index
= ipid
;
3442 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3447 // Fix the address pool to match a changed session.
3448 // (usually when the master sends us an update).
3449 static void fix_address_pool(int sid
)
3453 ipid
= session
[sid
].ip_pool_index
;
3455 if (ipid
> ip_pool_size
)
3456 return; // Ignore it. rebuild_address_pool will fix it up.
3458 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3459 return; // Just ignore it. rebuild_address_pool will take care of it.
3461 ip_address_pool
[ipid
].assigned
= 1;
3462 ip_address_pool
[ipid
].session
= sid
;
3463 ip_address_pool
[ipid
].last
= time_now
;
3464 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3468 // Add a block of addresses to the IP pool to hand out.
3470 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3474 mask
= 0xffffffff; // Host route only.
3478 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3481 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3483 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3484 continue; // Skip 0 and broadcast addresses.
3486 ip_address_pool
[ip_pool_size
].address
= i
;
3487 ip_address_pool
[ip_pool_size
].assigned
= 0;
3489 if (ip_pool_size
>= MAXIPPOOL
)
3491 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3497 // Initialize the IP address pool
3498 static void initippool()
3503 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3505 if (!(f
= fopen(IPPOOLFILE
, "r")))
3507 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3511 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3514 buf
[4095] = 0; // Force it to be zero terminated/
3516 if (*buf
== '#' || *buf
== '\n')
3517 continue; // Skip comments / blank lines
3518 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3519 if ((p
= (char *)strchr(buf
, ':')))
3523 src
= inet_addr(buf
);
3524 if (src
== INADDR_NONE
)
3526 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3529 // This entry is for a specific IP only
3530 if (src
!= config
->bind_address
)
3535 if ((p
= (char *)strchr(pool
, '/')))
3539 in_addr_t start
= 0, mask
= 0;
3541 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3543 if (!*p
|| !(numbits
= atoi(p
)))
3545 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3548 start
= ntohl(inet_addr(pool
));
3549 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3551 // Add a static route for this pool
3552 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3553 fmtaddr(htonl(start
), 0), 32 + mask
);
3555 routeset(0, start
, mask
, 0, 1);
3557 add_to_ip_pool(start
, mask
);
3561 // It's a single ip address
3562 add_to_ip_pool(inet_addr(pool
), 0);
3566 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3569 void snoop_send_packet(char *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3571 struct sockaddr_in snoop_addr
= {0};
3572 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3575 snoop_addr
.sin_family
= AF_INET
;
3576 snoop_addr
.sin_addr
.s_addr
= destination
;
3577 snoop_addr
.sin_port
= ntohs(port
);
3579 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3580 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3581 htons(snoop_addr
.sin_port
));
3583 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3584 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3586 STAT(packets_snooped
);
3589 static int dump_session(FILE **f
, sessiont
*s
)
3591 if (!s
->opened
|| !s
->ip
|| !(s
->cin
|| s
->cout
) || !*s
->user
|| s
->walled_garden
)
3596 char filename
[1024];
3598 time_t now
= time(NULL
);
3600 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3601 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3603 if (!(*f
= fopen(filename
, "w")))
3605 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3609 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3610 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3614 "# format: username ip qos uptxoctets downrxoctets\n",
3620 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3621 fprintf(*f
, "%s %s %d %u %u\n",
3622 s
->user
, // username
3623 fmtaddr(htonl(s
->ip
), 0), // ip
3624 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3625 (uint32_t) s
->cin
, // uptxoctets
3626 (uint32_t) s
->cout
); // downrxoctets
3628 s
->pin
= s
->cin
= 0;
3629 s
->pout
= s
->cout
= 0;
3634 static void dump_acct_info(int all
)
3640 CSTAT(dump_acct_info
);
3644 for (i
= 0; i
< shut_acct_n
; i
++)
3645 dump_session(&f
, &shut_acct
[i
]);
3651 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3652 dump_session(&f
, &session
[i
]);
3659 int main(int argc
, char *argv
[])
3663 char *optconfig
= CONFIGFILE
;
3665 time(&basetime
); // start clock
3668 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3673 if (fork()) exit(0);
3675 freopen("/dev/null", "r", stdin
);
3676 freopen("/dev/null", "w", stdout
);
3677 freopen("/dev/null", "w", stderr
);
3686 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3689 printf("Args are:\n"
3690 "\t-d\t\tDetach from terminal\n"
3691 "\t-c <file>\tConfig file\n"
3692 "\t-h <hostname>\tForce hostname\n"
3700 // Start the timer routine off
3702 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3703 signal(SIGALRM
, sigalrm_handler
);
3704 siginterrupt(SIGALRM
, 0);
3707 initdata(optdebug
, optconfig
);
3711 init_tbf(config
->num_tbfs
);
3713 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3714 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3715 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3718 rlim
.rlim_cur
= RLIM_INFINITY
;
3719 rlim
.rlim_max
= RLIM_INFINITY
;
3720 // Remove the maximum core size
3721 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3722 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3724 // Make core dumps go to /tmp
3728 if (config
->scheduler_fifo
)
3731 struct sched_param params
= {0};
3732 params
.sched_priority
= 1;
3734 if (get_nprocs() < 2)
3736 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3737 config
->scheduler_fifo
= 0;
3741 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3743 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3747 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3748 config
->scheduler_fifo
= 0;
3753 /* Set up the cluster communications port. */
3754 if (cluster_init() < 0)
3758 signal(SIGPIPE
, SIG_IGN
);
3759 bgp_setup(config
->as_number
);
3760 bgp_add_route(config
->bind_address
, 0xffffffff);
3761 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3763 if (config
->neighbour
[i
].name
[0])
3764 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3765 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3766 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3771 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3777 signal(SIGHUP
, sighup_handler
);
3778 signal(SIGTERM
, sigterm_handler
);
3779 signal(SIGINT
, sigterm_handler
);
3780 signal(SIGQUIT
, sigquit_handler
);
3781 signal(SIGCHLD
, sigchild_handler
);
3783 // Prevent us from getting paged out
3784 if (config
->lock_pages
)
3786 if (!mlockall(MCL_CURRENT
))
3787 LOG(1, 0, 0, "Locking pages into memory\n");
3789 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3794 // Drop privileges here
3795 if (config
->target_uid
> 0 && geteuid() == 0)
3796 setuid(config
->target_uid
);
3801 /* try to shut BGP down cleanly; with luck the sockets will be
3802 writable since we're out of the select */
3803 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3804 if (bgp_peers
[i
].state
== Established
)
3805 bgp_stop(&bgp_peers
[i
]);
3808 /* remove plugins (so cleanup code gets run) */
3811 // Remove the PID file if we wrote it
3812 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3813 unlink(config
->pid_file
);
3815 /* kill CLI children */
3816 signal(SIGTERM
, SIG_IGN
);
3821 static void sighup_handler(int sig
)
3825 if (log_stream
!= stderr
)
3834 static void sigalrm_handler(int sig
)
3836 // Log current traffic stats
3838 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3839 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3840 (udp_rx
/ 1024.0 / 1024.0 * 8),
3841 (eth_tx
/ 1024.0 / 1024.0 * 8),
3842 (eth_rx
/ 1024.0 / 1024.0 * 8),
3843 (udp_tx
/ 1024.0 / 1024.0 * 8),
3844 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3845 udp_rx_pkt
, eth_rx_pkt
);
3847 udp_tx
= udp_rx
= 0;
3848 udp_rx_pkt
= eth_rx_pkt
= 0;
3849 eth_tx
= eth_rx
= 0;
3851 if (config
->dump_speed
)
3852 printf("%s\n", config
->bandwidth
);
3854 // Update the internal time counter
3856 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3861 struct param_timer p
= { time_now
};
3862 run_plugins(PLUGIN_TIMER
, &p
);
3867 static void sigterm_handler(int sig
)
3869 LOG(1, 0, 0, "Shutting down cleanly\n");
3873 static void sigquit_handler(int sig
)
3877 LOG(1, 0, 0, "Shutting down without saving sessions\n");
3879 if (config
->cluster_iam_master
)
3881 for (i
= 1; i
< MAXSESSION
; i
++)
3883 if (session
[i
].opened
)
3884 sessionkill(i
, "L2TPNS Closing");
3886 for (i
= 1; i
< MAXTUNNEL
; i
++)
3888 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3889 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3896 static void sigchild_handler(int sig
)
3898 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3902 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
)
3905 *challenge_response
= NULL
;
3907 if (!*config
->l2tpsecret
)
3909 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3913 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
3915 *challenge_response
= (char *)calloc(17, 1);
3918 MD5Update(&ctx
, &id
, 1);
3919 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3920 MD5Update(&ctx
, challenge
, challenge_length
);
3921 MD5Final(*challenge_response
, &ctx
);
3926 static int facility_value(char *name
)
3929 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3931 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3932 return facilitynames
[i
].c_val
;
3937 static void update_config()
3941 static int timeout
= 0;
3942 static int interval
= 0;
3949 if (log_stream
!= stderr
)
3955 if (*config
->log_filename
)
3957 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3959 char *p
= config
->log_filename
+ 7;
3962 openlog("l2tpns", LOG_PID
, facility_value(p
));
3966 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
3968 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
3970 fseek(log_stream
, 0, SEEK_END
);
3971 setbuf(log_stream
, NULL
);
3975 log_stream
= stderr
;
3976 setbuf(log_stream
, NULL
);
3982 log_stream
= stderr
;
3983 setbuf(log_stream
, NULL
);
3987 config
->numradiusservers
= 0;
3988 for (i
= 0; i
< MAXRADSERVER
; i
++)
3989 if (config
->radiusserver
[i
])
3991 config
->numradiusservers
++;
3992 // Set radius port: if not set, take the port from the
3993 // first radius server. For the first radius server,
3994 // take the #defined default value from l2tpns.h
3996 // test twice, In case someone works with
3997 // a secondary radius server without defining
3998 // a primary one, this will work even then.
3999 if (i
> 0 && !config
->radiusport
[i
])
4000 config
->radiusport
[i
] = config
->radiusport
[i
-1];
4001 if (!config
->radiusport
[i
])
4002 config
->radiusport
[i
] = RADPORT
;
4005 if (!config
->numradiusservers
)
4006 LOG(0, 0, 0, "No RADIUS servers defined!\n");
4008 config
->num_radfds
= 2 << RADIUS_SHIFT
;
4010 // parse radius_authtypes_s
4011 config
->radius_authtypes
= config
->radius_authprefer
= 0;
4012 p
= config
->radius_authtypes_s
;
4015 char *s
= strpbrk(p
, " \t,");
4021 while (*s
== ' ' || *s
== '\t')
4028 if (!strncasecmp("chap", p
, strlen(p
)))
4030 else if (!strncasecmp("pap", p
, strlen(p
)))
4033 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p
);
4035 config
->radius_authtypes
|= type
;
4036 if (!config
->radius_authprefer
)
4037 config
->radius_authprefer
= type
;
4042 if (!config
->radius_authtypes
)
4044 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
4045 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
4048 // normalise radius_authtypes_s
4049 if (config
->radius_authprefer
== AUTHPAP
)
4051 strcpy(config
->radius_authtypes_s
, "pap");
4052 if (config
->radius_authtypes
& AUTHCHAP
)
4053 strcat(config
->radius_authtypes_s
, ", chap");
4057 strcpy(config
->radius_authtypes_s
, "chap");
4058 if (config
->radius_authtypes
& AUTHPAP
)
4059 strcat(config
->radius_authtypes_s
, ", pap");
4062 // re-initialise the random number source
4063 initrandom(config
->random_device
);
4066 for (i
= 0; i
< MAXPLUGINS
; i
++)
4068 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4071 if (*config
->plugins
[i
])
4074 add_plugin(config
->plugins
[i
]);
4076 else if (*config
->old_plugins
[i
])
4079 remove_plugin(config
->old_plugins
[i
]);
4083 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4084 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
4085 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4086 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4087 if (!*config
->cluster_interface
)
4088 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4090 if (!config
->cluster_hb_interval
)
4091 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4093 if (!config
->cluster_hb_timeout
)
4094 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4096 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4098 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4099 // late, ensure we're sufficiently larger than that
4100 int t
= 4 * config
->cluster_hb_interval
+ 11;
4102 if (config
->cluster_hb_timeout
< t
)
4104 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4105 config
->cluster_hb_timeout
= t
;
4108 // Push timing changes to the slaves immediately if we're the master
4109 if (config
->cluster_iam_master
)
4110 cluster_heartbeat();
4112 interval
= config
->cluster_hb_interval
;
4113 timeout
= config
->cluster_hb_timeout
;
4117 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4120 if ((f
= fopen(config
->pid_file
, "w")))
4122 fprintf(f
, "%d\n", getpid());
4124 config
->wrote_pid
= 1;
4128 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4132 config
->reload_config
= 0;
4135 static void read_config_file()
4139 if (!config
->config_file
) return;
4140 if (!(f
= fopen(config
->config_file
, "r")))
4142 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4146 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4148 LOG(3, 0, 0, "Done reading config file\n");
4153 int sessionsetup(tunnelidt t
, sessionidt s
)
4155 // A session now exists, set it up
4161 CSTAT(sessionsetup
);
4163 LOG(3, s
, t
, "Doing session setup for session\n");
4167 assign_ip_address(s
);
4170 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4171 sessionshutdown(s
, "No IP addresses available.", 2, 7);
4174 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4175 fmtaddr(htonl(session
[s
].ip
), 0));
4179 // Make sure this is right
4180 session
[s
].tunnel
= t
;
4182 // zap old sessions with same IP and/or username
4183 // Don't kill gardened sessions - doing so leads to a DoS
4184 // from someone who doesn't need to know the password
4187 user
= session
[s
].user
;
4188 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4190 if (i
== s
) continue;
4191 if (ip
== session
[i
].ip
) sessionkill(i
, "Duplicate IP address");
4192 if (!session
[s
].walled_garden
&& !session
[i
].walled_garden
&& strcasecmp(user
, session
[i
].user
) == 0)
4193 sessionkill(i
, "Duplicate session for users");
4200 // Add the route for this session.
4201 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4203 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4204 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4207 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4210 // Static IPs need to be routed if not already
4211 // convered by a Framed-Route. Anything else is part
4212 // of the IP address pool and is already routed, it
4213 // just needs to be added to the IP cache.
4214 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4215 if (session
[s
].ip_pool_index
== -1) // static ip
4217 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4220 cache_ipmap(session
[s
].ip
, s
);
4223 if (!session
[s
].unique_id
)
4225 // did this session just finish radius?
4226 LOG(3, s
, t
, "Sending initial IPCP to client\n");
4228 session
[s
].unique_id
= ++last_id
;
4231 // Run the plugin's against this new session.
4233 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4234 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4237 // Allocate TBFs if throttled
4238 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4239 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4241 session
[s
].last_packet
= time_now
;
4243 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4244 fmtaddr(htonl(session
[s
].ip
), 0),
4245 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4247 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4249 return 1; // RADIUS OK and IP allocated, done...
4253 // This session just got dropped on us by the master or something.
4254 // Make sure our tables up up to date...
4256 int load_session(sessionidt s
, sessiont
*new)
4262 if (new->ip_pool_index
>= MAXIPPOOL
||
4263 new->tunnel
>= MAXTUNNEL
)
4265 LOG(0, s
, 0, "Strange session update received!\n");
4266 // FIXME! What to do here?
4271 // Ok. All sanity checks passed. Now we're committed to
4272 // loading the new session.
4275 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4277 // See if routes/ip cache need updating
4278 if (new->ip
!= session
[s
].ip
)
4281 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4282 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4283 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4291 // remove old routes...
4292 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4294 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4295 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4298 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4304 if (session
[s
].ip_pool_index
== -1) // static IP
4306 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4308 else // It's part of the IP pool, remove it manually.
4309 uncache_ipmap(session
[s
].ip
);
4314 // add new routes...
4315 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4317 if ((new->ip
& new->route
[i
].mask
) ==
4318 (new->route
[i
].ip
& new->route
[i
].mask
))
4321 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4327 // If there's a new one, add it.
4328 if (new->ip_pool_index
== -1)
4330 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4333 cache_ipmap(new->ip
, s
);
4338 if (new->flags
& SF_IPV6_ROUTED
&& !(session
[s
].flags
& SF_IPV6_ROUTED
))
4339 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4342 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4344 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4348 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4350 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4351 new->filter_out
= 0;
4354 if (new->filter_in
!= session
[s
].filter_in
)
4356 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4357 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4360 if (new->filter_out
!= session
[s
].filter_out
)
4362 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4363 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4366 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4367 // for walking the sessions to forward byte counts to the master.
4368 config
->cluster_highest_sessionid
= s
;
4370 // TEMP: old session struct used a uint32_t to define the throttle
4371 // speed for both up/down, new uses a uint16_t for each. Deal with
4372 // sessions from an old master for migration.
4373 if (new->throttle_out
== 0 && new->tbf_out
)
4374 new->throttle_out
= new->throttle_in
;
4376 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4378 // Do fixups into address pool.
4379 if (new->ip_pool_index
!= -1)
4380 fix_address_pool(s
);
4385 static void initplugins()
4389 loaded_plugins
= ll_init();
4390 // Initialize the plugins to nothing
4391 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4392 plugins
[i
] = ll_init();
4395 static void *open_plugin(char *plugin_name
, int load
)
4397 char path
[256] = "";
4399 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4400 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4401 return dlopen(path
, RTLD_NOW
);
4404 // plugin callback to get a config value
4405 static void *getconfig(char *key
, enum config_typet type
)
4409 for (i
= 0; config_values
[i
].key
; i
++)
4411 if (!strcmp(config_values
[i
].key
, key
))
4413 if (config_values
[i
].type
== type
)
4414 return ((void *) config
) + config_values
[i
].offset
;
4416 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4417 key
, type
, config_values
[i
].type
);
4423 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4427 static int add_plugin(char *plugin_name
)
4429 static struct pluginfuncs funcs
= {
4434 sessiontbysessionidt
,
4435 sessionidtbysessiont
,
4442 cluster_send_session
,
4445 void *p
= open_plugin(plugin_name
, 1);
4446 int (*initfunc
)(struct pluginfuncs
*);
4451 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4455 if (ll_contains(loaded_plugins
, p
))
4458 return 0; // already loaded
4462 int *v
= dlsym(p
, "plugin_api_version");
4463 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4465 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4471 if ((initfunc
= dlsym(p
, "plugin_init")))
4473 if (!initfunc(&funcs
))
4475 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4481 ll_push(loaded_plugins
, p
);
4483 for (i
= 0; i
< max_plugin_functions
; i
++)
4486 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4488 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4489 ll_push(plugins
[i
], x
);
4493 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4497 static void run_plugin_done(void *plugin
)
4499 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4505 static int remove_plugin(char *plugin_name
)
4507 void *p
= open_plugin(plugin_name
, 0);
4513 if (ll_contains(loaded_plugins
, p
))
4516 for (i
= 0; i
< max_plugin_functions
; i
++)
4519 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4520 ll_delete(plugins
[i
], x
);
4523 ll_delete(loaded_plugins
, p
);
4529 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4533 int run_plugins(int plugin_type
, void *data
)
4535 int (*func
)(void *data
);
4537 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4538 return PLUGIN_RET_ERROR
;
4540 ll_reset(plugins
[plugin_type
]);
4541 while ((func
= ll_next(plugins
[plugin_type
])))
4545 if (r
!= PLUGIN_RET_OK
)
4546 return r
; // stop here
4549 return PLUGIN_RET_OK
;
4552 static void plugins_done()
4556 ll_reset(loaded_plugins
);
4557 while ((p
= ll_next(loaded_plugins
)))
4561 static void processcontrol(uint8_t * buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4563 struct nsctl request
;
4564 struct nsctl response
;
4565 int type
= unpack_control(&request
, buf
, len
);
4569 if (log_stream
&& config
->debug
>= 4)
4573 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4574 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4578 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4579 dump_control(&request
, log_stream
);
4585 case NSCTL_REQ_LOAD
:
4586 if (request
.argc
!= 1)
4588 response
.type
= NSCTL_RES_ERR
;
4590 response
.argv
[0] = "name of plugin required";
4592 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4594 response
.type
= NSCTL_RES_ERR
;
4596 response
.argv
[0] = !r
4597 ? "plugin already loaded"
4598 : "error loading plugin";
4602 response
.type
= NSCTL_RES_OK
;
4608 case NSCTL_REQ_UNLOAD
:
4609 if (request
.argc
!= 1)
4611 response
.type
= NSCTL_RES_ERR
;
4613 response
.argv
[0] = "name of plugin required";
4615 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4617 response
.type
= NSCTL_RES_ERR
;
4619 response
.argv
[0] = !r
4620 ? "plugin not loaded"
4621 : "plugin not found";
4625 response
.type
= NSCTL_RES_OK
;
4631 case NSCTL_REQ_HELP
:
4632 response
.type
= NSCTL_RES_OK
;
4635 ll_reset(loaded_plugins
);
4636 while ((p
= ll_next(loaded_plugins
)))
4638 char **help
= dlsym(p
, "plugin_control_help");
4639 while (response
.argc
< 0xff && help
&& *help
)
4640 response
.argv
[response
.argc
++] = *help
++;
4645 case NSCTL_REQ_CONTROL
:
4647 struct param_control param
= {
4648 config
->cluster_iam_master
,
4655 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4657 if (r
== PLUGIN_RET_ERROR
)
4659 response
.type
= NSCTL_RES_ERR
;
4661 response
.argv
[0] = param
.additional
4663 : "error returned by plugin";
4665 else if (r
== PLUGIN_RET_NOTMASTER
)
4667 static char msg
[] = "must be run on master: 000.000.000.000";
4669 response
.type
= NSCTL_RES_ERR
;
4671 if (config
->cluster_master_address
)
4673 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4674 response
.argv
[0] = msg
;
4678 response
.argv
[0] = "must be run on master: none elected";
4681 else if (!(param
.response
& NSCTL_RESPONSE
))
4683 response
.type
= NSCTL_RES_ERR
;
4685 response
.argv
[0] = param
.response
4686 ? "unrecognised response value from plugin"
4687 : "unhandled action";
4691 response
.type
= param
.response
;
4693 if (param
.additional
)
4696 response
.argv
[0] = param
.additional
;
4704 response
.type
= NSCTL_RES_ERR
;
4706 response
.argv
[0] = "error unpacking control packet";
4709 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4712 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4716 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4719 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4720 if (log_stream
&& config
->debug
>= 4)
4722 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4723 dump_control(&response
, log_stream
);
4727 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4728 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4733 static tunnelidt
new_tunnel()
4736 for (i
= 1; i
< MAXTUNNEL
; i
++)
4738 if (tunnel
[i
].state
== TUNNELFREE
)
4740 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4741 if (i
> config
->cluster_highest_tunnelid
)
4742 config
->cluster_highest_tunnelid
= i
;
4746 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4751 // We're becoming the master. Do any required setup..
4753 // This is principally telling all the plugins that we're
4754 // now a master, and telling them about all the sessions
4755 // that are active too..
4757 void become_master(void)
4760 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4762 // running a bunch of iptables commands is slow and can cause
4763 // the master to drop tunnels on takeover--kludge around the
4764 // problem by forking for the moment (note: race)
4765 if (!fork_and_close())
4767 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4769 if (!session
[s
].opened
) // Not an in-use session.
4772 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4778 for (i
= 0; i
< config
->num_radfds
; i
++)
4780 FD_SET(radfds
[i
], &readset
);
4781 if (radfds
[i
] > readset_n
)
4782 readset_n
= radfds
[i
];
4786 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4792 if (CLI_HELP_REQUESTED
)
4793 return CLI_HELP_NO_ARGS
;
4796 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4798 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4801 if (!session
[s
].opened
)
4804 idle
= time_now
- session
[s
].last_packet
;
4805 idle
/= 5 ; // In multiples of 5 seconds.
4815 for (i
= 0; i
< 63; ++i
)
4817 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4819 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4820 cli_print(cli
, "%d total sessions open.", count
);
4824 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4830 if (CLI_HELP_REQUESTED
)
4831 return CLI_HELP_NO_ARGS
;
4834 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4836 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4839 if (!session
[s
].opened
)
4842 d
= time_now
- session
[s
].opened
;
4845 while (d
> 1 && open
< 32)
4855 for (i
= 0; i
< 30; ++i
)
4857 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4860 cli_print(cli
, "%d total sessions open.", count
);
4866 * This unencodes the AVP using the L2TP secret and the previously
4867 * stored random vector. It overwrites the hidden data with the
4868 * unhidden AVP subformat.
4870 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
4877 // Compute initial pad
4879 MD5Update(&ctx
, (uint8_t) (type
>> 8) & 0xff, 1);
4880 MD5Update(&ctx
, (uint8_t) type
& 0xff, 1);
4881 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4882 MD5Update(&ctx
, vector
, vec_len
);
4883 MD5Final(digest
, &ctx
);
4885 // pointer to last decoded 16 octets
4890 // calculate a new pad based on the last decoded block
4891 if (d
>= sizeof(digest
))
4894 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4895 MD5Update(&ctx
, last
, sizeof(digest
));
4896 MD5Final(digest
, &ctx
);
4902 *value
++ ^= digest
[d
++];
4907 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
4911 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
4912 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
4913 case FILTER_PORT_OP_GT
: return port
> p
->port
;
4914 case FILTER_PORT_OP_LT
: return port
< p
->port
;
4915 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
4921 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
4925 case FILTER_FLAG_OP_ANY
:
4926 return (flags
& sflags
) || (~flags
& cflags
);
4928 case FILTER_FLAG_OP_ALL
:
4929 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
4931 case FILTER_FLAG_OP_EST
:
4932 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
4938 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
4940 uint16_t frag_offset
;
4944 uint16_t src_port
= 0;
4945 uint16_t dst_port
= 0;
4947 ip_filter_rulet
*rule
;
4949 if (len
< 20) // up to end of destination address
4952 if ((*buf
>> 4) != 4) // IPv4
4955 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
4957 src_ip
= *(in_addr_t
*) (buf
+ 12);
4958 dst_ip
= *(in_addr_t
*) (buf
+ 16);
4960 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
4962 int l
= (buf
[0] & 0xf) * 4; // length of IP header
4963 if (len
< l
+ 4) // ports
4966 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
4967 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
4968 if (proto
== IPPROTO_TCP
)
4970 if (len
< l
+ 14) // flags
4973 flags
= buf
[l
+ 13] & 0x3f;
4977 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
4979 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
4982 if (rule
->src_wild
!= INADDR_BROADCAST
&&
4983 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
4986 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
4987 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
4992 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
5000 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
5002 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
5005 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
5008 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
5009 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
5016 return rule
->action
== FILTER_ACTION_PERMIT
;