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 1.89 2005-04-01 06:39:00 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 uint32_t sessionid
= 0; // session id for radius accounting
72 static int syslog_log
= 0; // are we logging to syslog
73 static FILE *log_stream
= NULL
; // file handle for direct logging (i.e. direct into file, not via syslog).
74 extern int cluster_sockfd
; // Intra-cluster communications socket.
75 uint32_t last_id
= 0; // Last used PPP SID. Can I kill this?? -- mo
77 struct cli_session_actions
*cli_session_actions
= NULL
; // Pending session changes requested by CLI
78 struct cli_tunnel_actions
*cli_tunnel_actions
= NULL
; // Pending tunnel changes required by CLI
80 static void *ip_hash
[256]; // Mapping from IP address to session structures.
83 struct ipv6radix
*branch
;
84 } ipv6_hash
[256]; // Mapping from IPv6 address to session structures.
87 static uint32_t udp_rx
= 0, udp_rx_pkt
= 0, udp_tx
= 0;
88 static uint32_t eth_rx
= 0, eth_rx_pkt
= 0;
91 static uint32_t ip_pool_size
= 1; // Size of the pool of addresses used for dynamic address allocation.
92 time_t time_now
= 0; // Current time in seconds since epoch.
93 static char time_now_string
[64] = {0}; // Current time as a string.
94 static char main_quit
= 0; // True if we're in the process of exiting.
95 linked_list
*loaded_plugins
;
96 linked_list
*plugins
[MAX_PLUGIN_TYPES
];
98 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
99 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
101 config_descriptt config_values
[] = {
102 CONFIG("debug", debug
, INT
),
103 CONFIG("log_file", log_filename
, STRING
),
104 CONFIG("pid_file", pid_file
, STRING
),
105 CONFIG("random_device", random_device
, STRING
),
106 CONFIG("l2tp_secret", l2tpsecret
, STRING
),
107 CONFIG("primary_dns", default_dns1
, IPv4
),
108 CONFIG("secondary_dns", default_dns2
, IPv4
),
109 CONFIG("primary_radius", radiusserver
[0], IPv4
),
110 CONFIG("secondary_radius", radiusserver
[1], IPv4
),
111 CONFIG("primary_radius_port", radiusport
[0], SHORT
),
112 CONFIG("secondary_radius_port", radiusport
[1], SHORT
),
113 CONFIG("radius_accounting", radius_accounting
, BOOL
),
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 s
)
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(s
? session
[s
].far
: 0); // 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
= session
[s
].radius
;
1462 if (!(r
= radiusnew(s
)))
1464 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions for Stop message\n");
1465 STAT(radius_overflow
);
1469 random_data(radius
[r
].auth
, sizeof(radius
[r
].auth
));
1473 if (r
&& radius
[r
].state
!= RADIUSSTOP
)
1474 radiussend(r
, RADIUSSTOP
); // stop, if not already trying
1476 // Save counters to dump to accounting file
1477 if (*config
->accounting_dir
&& shut_acct_n
< sizeof(shut_acct
) / sizeof(*shut_acct
))
1478 memcpy(&shut_acct
[shut_acct_n
++], &session
[s
], sizeof(session
[s
]));
1482 { // IP allocated, clear and unroute
1485 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
1487 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
1488 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
1491 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 0);
1492 session
[s
].route
[r
].ip
= 0;
1495 if (session
[s
].ip_pool_index
== -1) // static ip
1497 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
1503 // unroute IPv6, if setup
1504 if (session
[s
].flags
& SF_IPV6_ROUTED
)
1505 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 0);
1508 if (session
[s
].throttle_in
|| session
[s
].throttle_out
) // Unthrottle if throttled.
1509 throttle_session(s
, 0, 0);
1513 controlt
*c
= controlnew(14); // sending CDN
1517 *(uint16_t *) buf
= htons(result
);
1518 *(uint16_t *) (buf
+2) = htons(error
);
1519 controlb(c
, 1, buf
, 4, 1);
1522 control16(c
, 1, result
, 1);
1524 control16(c
, 14, s
, 1); // assigned session (our end)
1525 controladd(c
, session
[s
].tunnel
, s
); // send the message
1528 if (!session
[s
].die
)
1529 session
[s
].die
= TIME
+ 150; // Clean up in 15 seconds
1531 // update filter refcounts
1532 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
1533 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
1535 cluster_send_session(s
);
1538 void sendipcp(tunnelidt t
, sessionidt s
)
1540 uint8_t buf
[MAXCONTROL
];
1541 uint16_t r
= session
[s
].radius
;
1549 if (radius
[r
].state
!= RADIUSIPCP
)
1551 radius
[r
].state
= RADIUSIPCP
;
1555 radius
[r
].retry
= backoff(radius
[r
].try++);
1556 if (radius
[r
].try > 10)
1558 radiusclear(r
, s
); // Clear radius session.
1559 sessionshutdown(s
, "No reply on IPCP", 3, 0);
1563 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPCP
);
1567 q
[1] = r
<< RADIUS_SHIFT
; // ID, dont care, we only send one type of request
1568 *(uint16_t *) (q
+ 2) = htons(10);
1571 *(in_addr_t
*) (q
+ 6) = config
->peer_address
? config
->peer_address
:
1572 config
->bind_address
? config
->bind_address
:
1573 my_address
; // send my IP
1575 tunnelsend(buf
, 10 + (q
- buf
), t
); // send it
1576 session
[s
].flags
&= ~SF_IPCP_ACKED
; // Clear flag.
1578 // If we have an IPv6 prefix length configured, assume we should
1579 // try to negotiate an IPv6 session as well. Unless we've had a
1580 // (N)ACK for IPV6CP.
1581 if (config
->ipv6_prefix
.s6_addr
[0] > 0 &&
1582 !(session
[s
].flags
& SF_IPV6CP_ACKED
) &&
1583 !(session
[s
].flags
& SF_IPV6_NACKED
))
1585 q
= makeppp(buf
,sizeof(buf
), 0, 0, t
, s
, PPPIPV6CP
);
1589 q
[1] = r
<< RADIUS_SHIFT
; // ID, don't care, we
1590 // only send one type
1592 *(uint16_t *) (q
+ 2) = htons(14);
1595 *(uint32_t *) (q
+ 6) = 0; // We'll be prefix::1
1596 *(uint32_t *) (q
+ 10) = 0;
1599 tunnelsend(buf
, 14 + (q
- buf
), t
); // send it
1603 // kill a session now
1604 void sessionkill(sessionidt s
, char *reason
)
1609 if (!session
[s
].opened
) // not alive
1612 if (session
[s
].next
)
1614 LOG(0, s
, session
[s
].tunnel
, "Tried to kill a session with next pointer set (%d)\n", session
[s
].next
);
1618 session
[s
].die
= TIME
;
1619 sessionshutdown(s
, reason
, 3, 0); // close radius/routes, etc.
1620 if (session
[s
].radius
)
1621 radiusclear(session
[s
].radius
, s
); // cant send clean accounting data, session is killed
1623 LOG(2, s
, session
[s
].tunnel
, "Kill session %d (%s): %s\n", s
, session
[s
].user
, reason
);
1625 memset(&session
[s
], 0, sizeof(session
[s
]));
1626 session
[s
].tunnel
= T_FREE
; // Mark it as free.
1627 session
[s
].next
= sessionfree
;
1629 cli_session_actions
[s
].action
= 0;
1630 cluster_send_session(s
);
1633 static void tunnelclear(tunnelidt t
)
1636 memset(&tunnel
[t
], 0, sizeof(tunnel
[t
]));
1637 tunnel
[t
].state
= TUNNELFREE
;
1640 // kill a tunnel now
1641 static void tunnelkill(tunnelidt t
, char *reason
)
1648 tunnel
[t
].state
= TUNNELDIE
;
1650 // free control messages
1651 while ((c
= tunnel
[t
].controls
))
1653 controlt
* n
= c
->next
;
1654 tunnel
[t
].controls
= n
;
1655 tunnel
[t
].controlc
--;
1656 c
->next
= controlfree
;
1660 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1661 if (session
[s
].tunnel
== t
)
1662 sessionkill(s
, reason
);
1666 LOG(1, 0, t
, "Kill tunnel %d: %s\n", t
, reason
);
1667 cli_tunnel_actions
[t
].action
= 0;
1668 cluster_send_tunnel(t
);
1671 // shut down a tunnel cleanly
1672 static void tunnelshutdown(tunnelidt t
, char *reason
, int result
, int error
, char *msg
)
1676 CSTAT(tunnelshutdown
);
1678 if (!tunnel
[t
].last
|| !tunnel
[t
].far
|| tunnel
[t
].state
== TUNNELFREE
)
1680 // never set up, can immediately kill
1681 tunnelkill(t
, reason
);
1684 LOG(1, 0, t
, "Shutting down tunnel %d (%s)\n", t
, reason
);
1687 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
1688 if (session
[s
].tunnel
== t
)
1689 sessionshutdown(s
, reason
, 3, 0);
1691 tunnel
[t
].state
= TUNNELDIE
;
1692 tunnel
[t
].die
= TIME
+ 700; // Clean up in 70 seconds
1693 cluster_send_tunnel(t
);
1694 // TBA - should we wait for sessions to stop?
1697 controlt
*c
= controlnew(4); // sending StopCCN
1702 *(uint16_t *) buf
= htons(result
);
1703 *(uint16_t *) (buf
+2) = htons(error
);
1706 int m
= strlen(msg
);
1707 if (m
+ 4 > sizeof(buf
))
1708 m
= sizeof(buf
) - 4;
1710 memcpy(buf
+4, msg
, m
);
1714 controlb(c
, 1, buf
, l
, 1);
1717 control16(c
, 1, result
, 1);
1719 control16(c
, 9, t
, 1); // assigned tunnel (our end)
1720 controladd(c
, t
, 0); // send the message
1724 // read and process packet on tunnel (UDP)
1725 void processudp(uint8_t * buf
, int len
, struct sockaddr_in
*addr
)
1727 char *chapresponse
= NULL
;
1728 uint16_t l
= len
, t
= 0, s
= 0, ns
= 0, nr
= 0;
1729 uint8_t *p
= buf
+ 2;
1736 LOG_HEX(5, "UDP Data", buf
, len
);
1737 STAT(tunnel_rx_packets
);
1738 INC_STAT(tunnel_rx_bytes
, len
);
1741 LOG(1, 0, 0, "Short UDP, %d bytes\n", len
);
1742 STAT(tunnel_rx_errors
);
1745 if ((buf
[1] & 0x0F) != 2)
1747 LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf
[1] & 0x0F) != 2);
1748 STAT(tunnel_rx_errors
);
1753 l
= ntohs(*(uint16_t *) p
);
1756 t
= ntohs(*(uint16_t *) p
);
1758 s
= ntohs(*(uint16_t *) p
);
1760 if (s
>= MAXSESSION
)
1762 LOG(1, s
, t
, "Received UDP packet with invalid session ID\n");
1763 STAT(tunnel_rx_errors
);
1768 LOG(1, s
, t
, "Received UDP packet with invalid tunnel ID\n");
1769 STAT(tunnel_rx_errors
);
1774 ns
= ntohs(*(uint16_t *) p
);
1776 nr
= ntohs(*(uint16_t *) p
);
1781 uint16_t o
= ntohs(*(uint16_t *) p
);
1786 LOG(1, s
, t
, "Bad length %d>%d\n", (int) (p
- buf
), l
);
1787 STAT(tunnel_rx_errors
);
1793 uint16_t message
= 0xFFFF; // message type
1795 uint8_t mandatory
= 0;
1796 uint8_t chap
= 0; // if CHAP being used
1797 uint16_t asession
= 0; // assigned session
1798 uint32_t amagic
= 0; // magic number
1799 uint8_t aflags
= 0; // flags from last LCF
1800 uint16_t version
= 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
1801 int requestchap
= 0; // do we request PAP instead of original CHAP request?
1802 char called
[MAXTEL
] = ""; // called number
1803 char calling
[MAXTEL
] = ""; // calling number
1805 if (!config
->cluster_iam_master
)
1807 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
1811 // control messages must have bits 0x80|0x40|0x08
1812 // (type, length and sequence) set, and bits 0x02|0x01
1813 // (offset and priority) clear
1814 if ((*buf
& 0xCB) != 0xC8)
1816 LOG(1, s
, t
, "Bad control header %02X\n", *buf
);
1817 STAT(tunnel_rx_errors
);
1821 // check for duplicate tunnel open message
1827 // Is this a duplicate of the first packet? (SCCRQ)
1829 for (i
= 1; i
<= config
->cluster_highest_tunnelid
; ++i
)
1831 if (tunnel
[i
].state
!= TUNNELOPENING
||
1832 tunnel
[i
].ip
!= ntohl(*(in_addr_t
*) & addr
->sin_addr
) ||
1833 tunnel
[i
].port
!= ntohs(addr
->sin_port
) )
1836 LOG(3, s
, t
, "Duplicate SCCRQ?\n");
1841 LOG(3, s
, t
, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
1842 l
, tunnel
[t
].controlc
, tunnel
[t
].ns
, tunnel
[t
].nr
, ns
, nr
);
1844 // if no tunnel specified, assign one
1847 if (!(t
= new_tunnel()))
1849 LOG(1, 0, 0, "No more tunnels\n");
1850 STAT(tunnel_overflow
);
1854 tunnel
[t
].ip
= ntohl(*(in_addr_t
*) & addr
->sin_addr
);
1855 tunnel
[t
].port
= ntohs(addr
->sin_port
);
1856 tunnel
[t
].window
= 4; // default window
1857 STAT(tunnel_created
);
1858 LOG(1, 0, t
, " New tunnel from %s:%u ID %d\n",
1859 fmtaddr(htonl(tunnel
[t
].ip
), 0), tunnel
[t
].port
, t
);
1862 // If the 'ns' just received is not the 'nr' we're
1863 // expecting, just send an ack and drop it.
1865 // if 'ns' is less, then we got a retransmitted packet.
1866 // if 'ns' is greater than missed a packet. Either way
1867 // we should ignore it.
1868 if (ns
!= tunnel
[t
].nr
)
1870 // is this the sequence we were expecting?
1871 STAT(tunnel_rx_errors
);
1872 LOG(1, 0, t
, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
1873 t
, ns
, tunnel
[t
].nr
);
1875 if (l
) // Is this not a ZLB?
1880 // This is used to time out old tunnels
1881 tunnel
[t
].lastrec
= time_now
;
1883 // check sequence of this message
1885 int skip
= tunnel
[t
].window
; // track how many in-window packets are still in queue
1886 // some to clear maybe?
1887 while (tunnel
[t
].controlc
> 0 && (((tunnel
[t
].ns
- tunnel
[t
].controlc
) - nr
) & 0x8000))
1889 controlt
*c
= tunnel
[t
].controls
;
1890 tunnel
[t
].controls
= c
->next
;
1891 tunnel
[t
].controlc
--;
1892 c
->next
= controlfree
;
1895 tunnel
[t
].try = 0; // we have progress
1898 // receiver advance (do here so quoted correctly in any sends below)
1899 if (l
) tunnel
[t
].nr
= (ns
+ 1);
1900 if (skip
< 0) skip
= 0;
1901 if (skip
< tunnel
[t
].controlc
)
1903 // some control packets can now be sent that were previous stuck out of window
1904 int tosend
= tunnel
[t
].window
- skip
;
1905 controlt
*c
= tunnel
[t
].controls
;
1913 tunnel
[t
].try = 0; // first send
1914 tunnelsend(c
->buf
, c
->length
, t
);
1919 if (!tunnel
[t
].controlc
)
1920 tunnel
[t
].retry
= 0; // caught up
1923 { // if not a null message
1929 while (l
&& !(fatal
& 0x80)) // 0x80 = mandatory AVP
1931 uint16_t n
= (ntohs(*(uint16_t *) p
) & 0x3FF);
1937 LOG(1, s
, t
, "Invalid length in AVP\n");
1938 STAT(tunnel_rx_errors
);
1943 if (flags
& 0x3C) // reserved bits, should be clear
1945 LOG(1, s
, t
, "Unrecognised AVP flags %02X\n", *b
);
1947 result
= 2; // general error
1948 error
= 3; // reserved field non-zero
1953 if (*(uint16_t *) (b
))
1955 LOG(2, s
, t
, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b
)));
1957 result
= 2; // general error
1958 error
= 6; // generic vendor-specific error
1959 msg
= "unsupported vendor-specific";
1963 mtype
= ntohs(*(uint16_t *) (b
));
1971 // handle hidden AVPs
1972 if (!*config
->l2tpsecret
)
1974 LOG(1, s
, t
, "Hidden AVP requested, but no L2TP secret.\n");
1976 result
= 2; // general error
1977 error
= 6; // generic vendor-specific error
1978 msg
= "secret not specified";
1981 if (!session
[s
].random_vector_length
)
1983 LOG(1, s
, t
, "Hidden AVP requested, but no random vector.\n");
1985 result
= 2; // general error
1986 error
= 6; // generic
1987 msg
= "no random vector";
1992 LOG(2, s
, t
, "Short hidden AVP.\n");
1994 result
= 2; // general error
1995 error
= 2; // length is wrong
2000 LOG(4, s
, t
, "Hidden AVP\n");
2003 unhide_value(b
, n
, mtype
, session
[s
].random_vector
, session
[s
].random_vector_length
);
2005 orig_len
= ntohs(*(uint16_t *) b
);
2006 if (orig_len
> n
+ 2)
2008 LOG(1, s
, t
, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2012 result
= 2; // general error
2013 error
= 2; // length is wrong
2022 LOG(4, s
, t
, " AVP %d (%s) len %d\n", mtype
, avp_name(mtype
), n
);
2025 case 0: // message type
2026 message
= ntohs(*(uint16_t *) b
);
2027 mandatory
= flags
& 0x80;
2028 LOG(4, s
, t
, " Message type = %d (%s)\n", *b
, l2tp_message_type(message
));
2030 case 1: // result code
2032 uint16_t rescode
= ntohs(*(uint16_t *) b
);
2033 const char* resdesc
= "(unknown)";
2036 resdesc
= stopccn_result_code(rescode
);
2038 else if (message
== 14)
2040 resdesc
= cdn_result_code(rescode
);
2043 LOG(4, s
, t
, " Result Code %d: %s\n", rescode
, resdesc
);
2046 uint16_t errcode
= ntohs(*(uint16_t *)(b
+ 2));
2047 LOG(4, s
, t
, " Error Code %d: %s\n", errcode
, error_code(errcode
));
2050 LOG(4, s
, t
, " Error String: %.*s\n", n
-4, b
+4);
2055 case 2: // protocol version
2057 version
= ntohs(*(uint16_t *) (b
));
2058 LOG(4, s
, t
, " Protocol version = %d\n", version
);
2059 if (version
&& version
!= 0x0100)
2060 { // allow 0.0 and 1.0
2061 LOG(1, s
, t
, " Bad protocol version %04X\n", version
);
2063 result
= 5; // unspported protocol version
2064 error
= 0x0100; // supported version
2070 case 3: // framing capabilities
2071 // LOG(4, s, t, "Framing capabilities\n");
2073 case 4: // bearer capabilities
2074 // LOG(4, s, t, "Bearer capabilities\n");
2076 case 5: // tie breaker
2077 // We never open tunnels, so we don't care about tie breakers
2078 // LOG(4, s, t, "Tie breaker\n");
2080 case 6: // firmware revision
2081 // LOG(4, s, t, "Firmware revision\n");
2083 case 7: // host name
2084 memset(tunnel
[t
].hostname
, 0, 128);
2085 memcpy(tunnel
[t
].hostname
, b
, (n
>= 127) ? 127 : n
);
2086 LOG(4, s
, t
, " Tunnel hostname = \"%s\"\n", tunnel
[t
].hostname
);
2087 // TBA - to send to RADIUS
2089 case 8: // vendor name
2090 memset(tunnel
[t
].vendor
, 0, sizeof(tunnel
[t
].vendor
));
2091 memcpy(tunnel
[t
].vendor
, b
, (n
>= sizeof(tunnel
[t
].vendor
) - 1) ? sizeof(tunnel
[t
].vendor
) - 1 : n
);
2092 LOG(4, s
, t
, " Vendor name = \"%s\"\n", tunnel
[t
].vendor
);
2094 case 9: // assigned tunnel
2095 tunnel
[t
].far
= ntohs(*(uint16_t *) (b
));
2096 LOG(4, s
, t
, " Remote tunnel id = %d\n", tunnel
[t
].far
);
2098 case 10: // rx window
2099 tunnel
[t
].window
= ntohs(*(uint16_t *) (b
));
2100 if (!tunnel
[t
].window
)
2101 tunnel
[t
].window
= 1; // window of 0 is silly
2102 LOG(4, s
, t
, " rx window = %d\n", tunnel
[t
].window
);
2104 case 11: // Challenge
2106 LOG(4, s
, t
, " LAC requested CHAP authentication for tunnel\n");
2107 build_chap_response(b
, 2, n
, &chapresponse
);
2110 case 13: // Response
2111 // Why did they send a response? We never challenge.
2112 LOG(2, s
, t
, " received unexpected challenge response\n");
2115 case 14: // assigned session
2116 asession
= session
[s
].far
= ntohs(*(uint16_t *) (b
));
2117 LOG(4, s
, t
, " assigned session = %d\n", asession
);
2119 case 15: // call serial number
2120 LOG(4, s
, t
, " call serial number = %d\n", ntohl(*(uint32_t *)b
));
2122 case 18: // bearer type
2123 LOG(4, s
, t
, " bearer type = %d\n", ntohl(*(uint32_t *)b
));
2126 case 19: // framing type
2127 LOG(4, s
, t
, " framing type = %d\n", ntohl(*(uint32_t *)b
));
2130 case 21: // called number
2131 memset(called
, 0, MAXTEL
);
2132 memcpy(called
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
2133 LOG(4, s
, t
, " Called <%s>\n", called
);
2135 case 22: // calling number
2136 memset(calling
, 0, MAXTEL
);
2137 memcpy(calling
, b
, (n
>= MAXTEL
) ? (MAXTEL
-1) : n
);
2138 LOG(4, s
, t
, " Calling <%s>\n", calling
);
2142 case 24: // tx connect speed
2145 session
[s
].tx_connect_speed
= ntohl(*(uint32_t *)b
);
2149 // AS5300s send connect speed as a string
2151 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
2152 session
[s
].tx_connect_speed
= atol(tmp
);
2154 LOG(4, s
, t
, " TX connect speed <%u>\n", session
[s
].tx_connect_speed
);
2156 case 38: // rx connect speed
2159 session
[s
].rx_connect_speed
= ntohl(*(uint32_t *)b
);
2163 // AS5300s send connect speed as a string
2165 memcpy(tmp
, b
, (n
>= 30) ? 30 : n
);
2166 session
[s
].rx_connect_speed
= atol(tmp
);
2168 LOG(4, s
, t
, " RX connect speed <%u>\n", session
[s
].rx_connect_speed
);
2170 case 25: // Physical Channel ID
2172 uint32_t tmp
= ntohl(*(uint32_t *) b
);
2173 LOG(4, s
, t
, " Physical Channel ID <%X>\n", tmp
);
2176 case 29: // Proxy Authentication Type
2178 uint16_t atype
= ntohs(*(uint16_t *)b
);
2179 LOG(4, s
, t
, " Proxy Auth Type %d (%s)\n", atype
, auth_type(atype
));
2180 requestchap
= (atype
== 2);
2183 case 30: // Proxy Authentication Name
2185 char authname
[64] = {0};
2186 memcpy(authname
, b
, (n
> 63) ? 63 : n
);
2187 LOG(4, s
, t
, " Proxy Auth Name (%s)\n",
2191 case 31: // Proxy Authentication Challenge
2193 memcpy(radius
[session
[s
].radius
].auth
, b
, 16);
2194 LOG(4, s
, t
, " Proxy Auth Challenge\n");
2197 case 32: // Proxy Authentication ID
2199 uint16_t authid
= ntohs(*(uint16_t *)(b
));
2200 LOG(4, s
, t
, " Proxy Auth ID (%d)\n", authid
);
2201 if (session
[s
].radius
)
2202 radius
[session
[s
].radius
].id
= authid
;
2205 case 33: // Proxy Authentication Response
2207 char authresp
[64] = {0};
2208 memcpy(authresp
, b
, (n
> 63) ? 63 : n
);
2209 LOG(4, s
, t
, " Proxy Auth Response\n");
2212 case 27: // last send lcp
2213 { // find magic number
2214 uint8_t *p
= b
, *e
= p
+ n
;
2215 while (p
+ 1 < e
&& p
[1] && p
+ p
[1] <= e
)
2217 if (*p
== 5 && p
[1] == 6) // Magic-Number
2218 amagic
= ntohl(*(uint32_t *) (p
+ 2));
2219 else if (*p
== 3 && p
[1] == 5 && *(uint16_t *) (p
+ 2) == htons(PPPCHAP
) && p
[4] == 5) // Authentication-Protocol
2221 else if (*p
== 7) // Protocol-Field-Compression
2222 aflags
|= SESSIONPFC
;
2223 else if (*p
== 8) // Address-and-Control-Field-Compression
2224 aflags
|= SESSIONACFC
;
2229 case 28: // last recv lcp confreq
2231 case 26: // Initial Received LCP CONFREQ
2233 case 39: // seq required - we control it as an LNS anyway...
2235 case 36: // Random Vector
2236 LOG(4, s
, t
, " Random Vector received. Enabled AVP Hiding.\n");
2237 memset(session
[s
].random_vector
, 0, sizeof(session
[s
].random_vector
));
2238 memcpy(session
[s
].random_vector
, b
, n
);
2239 session
[s
].random_vector_length
= n
;
2243 static char e
[] = "unknown AVP 0xXXXX";
2244 LOG(2, s
, t
, " Unknown AVP type %d\n", mtype
);
2246 result
= 2; // general error
2247 error
= 8; // unknown mandatory AVP
2248 sprintf((msg
= e
) + 14, "%04x", mtype
);
2255 tunnelshutdown(t
, "Invalid mandatory AVP", result
, error
, msg
);
2259 case 1: // SCCRQ - Start Control Connection Request
2261 controlt
*c
= controlnew(2); // sending SCCRP
2262 control16(c
, 2, version
, 1); // protocol version
2263 control32(c
, 3, 3, 1); // framing
2264 controls(c
, 7, tunnel
[t
].hostname
, 1); // host name (TBA)
2265 if (chapresponse
) controlb(c
, 13, chapresponse
, 16, 1); // Challenge response
2266 control16(c
, 9, t
, 1); // assigned tunnel
2267 controladd(c
, t
, s
); // send the resply
2269 tunnel
[t
].state
= TUNNELOPENING
;
2272 tunnel
[t
].state
= TUNNELOPEN
;
2275 tunnel
[t
].state
= TUNNELOPEN
;
2276 controlnull(t
); // ack
2279 controlnull(t
); // ack
2280 tunnelshutdown(t
, "Stopped", 0, 0, 0); // Shut down cleanly
2283 controlnull(t
); // simply ACK
2297 STAT(session_overflow
);
2298 LOG(1, 0, t
, "No free sessions");
2307 sessionfree
= session
[s
].next
;
2308 memset(&session
[s
], 0, sizeof(session
[s
]));
2310 if (s
> config
->cluster_highest_sessionid
)
2311 config
->cluster_highest_sessionid
= s
;
2313 // make a RADIUS session
2314 if (!(r
= radiusnew(s
)))
2316 LOG(1, s
, t
, "No free RADIUS sessions for ICRQ\n");
2317 sessionkill(s
, "no free RADIUS sesions");
2321 c
= controlnew(11); // sending ICRP
2322 session
[s
].id
= sessionid
++;
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
, s
); // send the reply
2331 // Generate a random challenge
2332 random_data(radius
[r
].auth
, sizeof(radius
[r
].auth
));
2333 strncpy(radius
[r
].calling
, calling
, sizeof(radius
[r
].calling
) - 1);
2334 strncpy(session
[s
].called
, called
, sizeof(session
[s
].called
) - 1);
2335 strncpy(session
[s
].calling
, calling
, sizeof(session
[s
].calling
) - 1);
2336 STAT(session_created
);
2343 if (amagic
== 0) amagic
= time_now
;
2344 session
[s
].magic
= amagic
; // set magic number
2345 session
[s
].l2tp_flags
= aflags
; // set flags received
2346 LOG(3, s
, t
, "Magic %X Flags %X\n", amagic
, aflags
);
2347 controlnull(t
); // ack
2348 // In CHAP state, request PAP instead
2353 controlnull(t
); // ack
2354 sessionshutdown(s
, "Closed (Received CDN)", 0, 0);
2357 LOG(1, s
, t
, "Missing message type\n");
2360 STAT(tunnel_rx_errors
);
2362 tunnelshutdown(t
, "Unknown message type", 2, 6, "unknown message type");
2364 LOG(1, s
, t
, "Unknown message type %d\n", message
);
2367 if (chapresponse
) free(chapresponse
);
2368 cluster_send_tunnel(t
);
2372 LOG(4, s
, t
, " Got a ZLB ack\n");
2379 LOG_HEX(5, "Receive Tunnel Data", p
, l
);
2380 if (l
> 2 && p
[0] == 0xFF && p
[1] == 0x03)
2381 { // HDLC address header, discard
2387 LOG(1, s
, t
, "Short ppp length %d\n", l
);
2388 STAT(tunnel_rx_errors
);
2398 prot
= ntohs(*(uint16_t *) p
);
2403 if (s
&& !session
[s
].opened
) // Is something wrong??
2405 if (!config
->cluster_iam_master
)
2407 // Pass it off to the master to deal with..
2408 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2413 LOG(1, s
, t
, "UDP packet contains session which is not opened. Dropping packet.\n");
2414 STAT(tunnel_rx_errors
);
2420 session
[s
].last_packet
= time_now
;
2421 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2422 processpap(t
, s
, p
, l
);
2424 else if (prot
== PPPCHAP
)
2426 session
[s
].last_packet
= time_now
;
2427 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2428 processchap(t
, s
, p
, l
);
2430 else if (prot
== PPPLCP
)
2432 session
[s
].last_packet
= time_now
;
2433 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2434 processlcp(t
, s
, p
, l
);
2436 else if (prot
== PPPIPCP
)
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 processipcp(t
, s
, p
, l
);
2442 else if (prot
== PPPIPV6CP
)
2444 if (config
->ipv6_prefix
.s6_addr
[0] > 0)
2446 session
[s
].last_packet
= time_now
;
2447 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2448 processipv6cp(t
, s
, p
, l
);
2452 LOG(1, s
, t
, "IPv6 not configured; ignoring IPv6CP\n");
2455 else if (prot
== PPPCCP
)
2457 session
[s
].last_packet
= time_now
;
2458 if (!config
->cluster_iam_master
) { master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
); return; }
2459 processccp(t
, s
, p
, l
);
2461 else if (prot
== PPPIP
)
2465 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2466 return; // closing session, PPP not processed
2469 session
[s
].last_packet
= time_now
;
2470 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2472 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2476 processipin(t
, s
, p
, l
);
2478 else if (prot
== PPPIPV6
)
2480 if (!config
->ipv6_prefix
.s6_addr
[0] > 0)
2482 LOG(1, s
, t
, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
2487 LOG(4, s
, t
, "Session %d is closing. Don't process PPP packets\n", s
);
2488 return; // closing session, PPP not processed
2491 session
[s
].last_packet
= time_now
;
2492 if (session
[s
].walled_garden
&& !config
->cluster_iam_master
)
2494 master_forward_packet(buf
, len
, addr
->sin_addr
.s_addr
, addr
->sin_port
);
2498 processipv6in(t
, s
, p
, l
);
2502 STAT(tunnel_rx_errors
);
2503 LOG(1, s
, t
, "Unknown PPP protocol %04X\n", prot
);
2508 // read and process packet on tun
2509 static void processtun(uint8_t * buf
, int len
)
2511 LOG_HEX(5, "Receive TUN Data", buf
, len
);
2512 STAT(tun_rx_packets
);
2513 INC_STAT(tun_rx_bytes
, len
);
2521 LOG(1, 0, 0, "Short tun packet %d bytes\n", len
);
2522 STAT(tun_rx_errors
);
2526 if (*(uint16_t *) (buf
+ 2) == htons(PKTIP
)) // IPv4
2527 processipout(buf
, len
);
2528 else if (*(uint16_t *) (buf
+ 2) == htons(PKTIPV6
) // IPV6
2529 && config
->ipv6_prefix
.s6_addr
[0] > 0)
2530 processipv6out(buf
, len
);
2536 // Maximum number of actions to complete.
2537 // This is to avoid sending out too many packets
2539 #define MAX_ACTIONS 500
2541 static int regular_cleanups(void)
2543 static sessionidt s
= 0; // Next session to check for actions on.
2547 static clockt next_acct
= 0;
2548 static clockt next_shut_acct
= 0;
2551 LOG(3, 0, 0, "Begin regular cleanup\n");
2553 for (r
= 1; r
< MAXRADIUS
; r
++)
2555 if (!radius
[r
].state
)
2557 if (radius
[r
].retry
)
2559 if (radius
[r
].retry
<= TIME
)
2562 radius
[r
].retry
= backoff(radius
[r
].try+1); // Is this really needed? --mo
2564 for (t
= 1; t
<= config
->cluster_highest_tunnelid
; t
++)
2566 // check for expired tunnels
2567 if (tunnel
[t
].die
&& tunnel
[t
].die
<= TIME
)
2569 STAT(tunnel_timeout
);
2570 tunnelkill(t
, "Expired");
2573 // check for message resend
2574 if (tunnel
[t
].retry
&& tunnel
[t
].controlc
)
2576 // resend pending messages as timeout on reply
2577 if (tunnel
[t
].retry
<= TIME
)
2579 controlt
*c
= tunnel
[t
].controls
;
2580 uint8_t w
= tunnel
[t
].window
;
2581 tunnel
[t
].try++; // another try
2582 if (tunnel
[t
].try > 5)
2583 tunnelkill(t
, "Timeout on control message"); // game over
2587 tunnelsend(c
->buf
, c
->length
, t
);
2593 if (tunnel
[t
].state
== TUNNELOPEN
&& tunnel
[t
].lastrec
< TIME
+ 600)
2595 controlt
*c
= controlnew(6); // sending HELLO
2596 controladd(c
, t
, 0); // send the message
2597 LOG(3, 0, t
, "Sending HELLO message\n");
2600 // Check for tunnel changes requested from the CLI
2601 if ((a
= cli_tunnel_actions
[t
].action
))
2603 cli_tunnel_actions
[t
].action
= 0;
2604 if (a
& CLI_TUN_KILL
)
2606 LOG(2, 0, t
, "Dropping tunnel by CLI\n");
2607 tunnelshutdown(t
, "Requested by administrator", 1, 0, 0);
2614 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
2617 if (s
> config
->cluster_highest_sessionid
)
2620 if (!session
[s
].opened
) // Session isn't in use
2623 if (!session
[s
].die
&& session
[s
].ip
&& !(session
[s
].flags
& SF_IPCP_ACKED
))
2625 // IPCP has not completed yet. Resend
2626 LOG(3, s
, session
[s
].tunnel
, "No ACK for initial IPCP ConfigReq... resending\n");
2627 sendipcp(session
[s
].tunnel
, s
);
2630 // check for expired sessions
2631 if (session
[s
].die
&& session
[s
].die
<= TIME
)
2633 sessionkill(s
, "Expired");
2634 if (++count
>= MAX_ACTIONS
) break;
2638 // Drop sessions who have not responded within IDLE_TIMEOUT seconds
2639 if (session
[s
].last_packet
&& (time_now
- session
[s
].last_packet
>= IDLE_TIMEOUT
))
2641 sessionshutdown(s
, "No response to LCP ECHO requests", 3, 0);
2642 STAT(session_timeout
);
2643 if (++count
>= MAX_ACTIONS
) break;
2647 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
2648 if (session
[s
].user
[0] && (time_now
- session
[s
].last_packet
>= ECHO_TIMEOUT
))
2650 uint8_t b
[MAXCONTROL
] = {0};
2652 uint8_t *q
= makeppp(b
, sizeof(b
), 0, 0, session
[s
].tunnel
, s
, PPPLCP
);
2656 *(uint8_t *)(q
+ 1) = (time_now
% 255); // ID
2657 *(uint16_t *)(q
+ 2) = htons(8); // Length
2658 *(uint32_t *)(q
+ 4) = 0; // Magic Number (not supported)
2660 LOG(4, s
, session
[s
].tunnel
, "No data in %d seconds, sending LCP ECHO\n",
2661 (int)(time_now
- session
[s
].last_packet
));
2662 tunnelsend(b
, 24, session
[s
].tunnel
); // send it
2663 if (++count
>= MAX_ACTIONS
) break;
2666 // Check for actions requested from the CLI
2667 if ((a
= cli_session_actions
[s
].action
))
2671 cli_session_actions
[s
].action
= 0;
2672 if (a
& CLI_SESS_KILL
)
2674 LOG(2, s
, session
[s
].tunnel
, "Dropping session by CLI\n");
2675 sessionshutdown(s
, "Requested by administrator", 3, 0);
2676 a
= 0; // dead, no need to check for other actions
2679 if (a
& CLI_SESS_NOSNOOP
)
2681 LOG(2, s
, session
[s
].tunnel
, "Unsnooping session by CLI\n");
2682 session
[s
].snoop_ip
= 0;
2683 session
[s
].snoop_port
= 0;
2686 else if (a
& CLI_SESS_SNOOP
)
2688 LOG(2, s
, session
[s
].tunnel
, "Snooping session by CLI (to %s:%d)\n",
2689 fmtaddr(cli_session_actions
[s
].snoop_ip
, 0),
2690 cli_session_actions
[s
].snoop_port
);
2692 session
[s
].snoop_ip
= cli_session_actions
[s
].snoop_ip
;
2693 session
[s
].snoop_port
= cli_session_actions
[s
].snoop_port
;
2697 if (a
& CLI_SESS_NOTHROTTLE
)
2699 LOG(2, s
, session
[s
].tunnel
, "Un-throttling session by CLI\n");
2700 throttle_session(s
, 0, 0);
2703 else if (a
& CLI_SESS_THROTTLE
)
2705 LOG(2, s
, session
[s
].tunnel
, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
2706 cli_session_actions
[s
].throttle_in
,
2707 cli_session_actions
[s
].throttle_out
);
2709 throttle_session(s
, cli_session_actions
[s
].throttle_in
, cli_session_actions
[s
].throttle_out
);
2713 if (a
& CLI_SESS_NOFILTER
)
2715 LOG(2, s
, session
[s
].tunnel
, "Un-filtering session by CLI\n");
2716 filter_session(s
, 0, 0);
2719 else if (a
& CLI_SESS_FILTER
)
2721 LOG(2, s
, session
[s
].tunnel
, "Filtering session by CLI (in=%d, out=%d)\n",
2722 cli_session_actions
[s
].filter_in
,
2723 cli_session_actions
[s
].filter_out
);
2725 filter_session(s
, cli_session_actions
[s
].filter_in
, cli_session_actions
[s
].filter_out
);
2730 cluster_send_session(s
);
2732 if (++count
>= MAX_ACTIONS
) break;
2736 if (*config
->accounting_dir
)
2738 if (next_acct
<= TIME
)
2740 // Dump accounting data
2741 next_acct
= TIME
+ ACCT_TIME
;
2742 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2745 else if (next_shut_acct
<= TIME
)
2747 // Dump accounting data for shutdown sessions
2748 next_shut_acct
= TIME
+ ACCT_SHUT_TIME
;
2754 if (count
>= MAX_ACTIONS
)
2755 return 1; // Didn't finish!
2757 LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count
, config
->cleanup_interval
);
2763 // Are we in the middle of a tunnel update, or radius
2766 static int still_busy(void)
2769 static clockt last_talked
= 0;
2770 static clockt start_busy_wait
= 0;
2771 if (start_busy_wait
== 0)
2772 start_busy_wait
= TIME
;
2774 for (i
= config
->cluster_highest_tunnelid
; i
> 0 ; --i
)
2776 if (!tunnel
[i
].controlc
)
2779 if (last_talked
!= TIME
)
2781 LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i
);
2787 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
2788 if (abs(TIME
- start_busy_wait
) > BUSY_WAIT_TIME
)
2790 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
2794 for (i
= 1; i
< MAXRADIUS
; i
++)
2796 if (radius
[i
].state
== RADIUSNULL
)
2798 if (radius
[i
].state
== RADIUSWAIT
)
2801 if (last_talked
!= TIME
)
2803 LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i
, radius
[i
].session
);
2812 static fd_set readset
;
2813 static int readset_n
= 0;
2815 // main loop - gets packets on tun or udp and processes them
2816 static void mainloop(void)
2821 clockt next_cluster_ping
= 0; // send initial ping immediately
2822 time_t next_clean
= time_now
+ config
->cleanup_interval
;
2824 LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
2825 udpfd
, tunfd
, cluster_sockfd
, controlfd
);
2828 FD_SET(udpfd
, &readset
);
2829 FD_SET(tunfd
, &readset
);
2830 FD_SET(controlfd
, &readset
);
2831 FD_SET(clifd
, &readset
);
2832 if (cluster_sockfd
) FD_SET(cluster_sockfd
, &readset
);
2834 if (tunfd
> readset_n
) readset_n
= tunfd
;
2835 if (controlfd
> readset_n
) readset_n
= controlfd
;
2836 if (clifd
> readset_n
) readset_n
= clifd
;
2837 if (cluster_sockfd
> readset_n
) readset_n
= cluster_sockfd
;
2839 while (!main_quit
|| still_busy())
2845 int bgp_set
[BGP_NUM_PEERS
];
2848 if (config
->reload_config
)
2850 // Update the config state based on config settings
2854 memcpy(&r
, &readset
, sizeof(fd_set
));
2856 to
.tv_usec
= 100000; // 1/10th of a second.
2860 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2862 bgp_set
[i
] = bgp_select_state(&bgp_peers
[i
]);
2865 FD_SET(bgp_peers
[i
].sock
, &r
);
2866 if (bgp_peers
[i
].sock
> n
)
2867 n
= bgp_peers
[i
].sock
;
2872 FD_SET(bgp_peers
[i
].sock
, &w
);
2873 if (bgp_peers
[i
].sock
> n
)
2874 n
= bgp_peers
[i
].sock
;
2878 n
= select(n
+ 1, &r
, &w
, 0, &to
);
2880 n
= select(n
+ 1, &r
, 0, 0, &to
);
2883 STAT(select_called
);
2888 if (errno
== EINTR
||
2889 errno
== ECHILD
) // EINTR was clobbered by sigchild_handler()
2892 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno
));
2898 struct sockaddr_in addr
;
2902 int cluster_pkts
= 0;
2905 if (FD_ISSET(controlfd
, &r
))
2907 alen
= sizeof(addr
);
2908 processcontrol(buf
, recvfrom(controlfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
), &addr
, alen
);
2913 if (config
->cluster_iam_master
)
2915 for (i
= 0; i
< config
->num_radfds
; i
++)
2917 if (FD_ISSET(radfds
[i
], &r
))
2919 processrad(buf
, recv(radfds
[i
], buf
, sizeof(buf
), 0), i
);
2926 if (FD_ISSET(clifd
, &r
))
2930 alen
= sizeof(addr
);
2931 if ((cli
= accept(clifd
, (struct sockaddr
*)&addr
, &alen
)) >= 0)
2937 LOG(0, 0, 0, "accept error: %s\n", strerror(errno
));
2943 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
2945 int isr
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &r
) : 0;
2946 int isw
= bgp_set
[i
] ? FD_ISSET(bgp_peers
[i
].sock
, &w
) : 0;
2947 bgp_process(&bgp_peers
[i
], isr
, isw
);
2953 for (c
= 0; n
&& c
< config
->multi_read_count
; c
++)
2956 if (FD_ISSET(udpfd
, &r
))
2958 alen
= sizeof(addr
);
2959 if ((s
= recvfrom(udpfd
, buf
, sizeof(buf
), 0, (void *) &addr
, &alen
)) > 0)
2961 processudp(buf
, s
, &addr
);
2972 if (FD_ISSET(tunfd
, &r
))
2974 if ((s
= read(tunfd
, buf
, sizeof(buf
))) > 0)
2987 if (FD_ISSET(cluster_sockfd
, &r
))
2989 alen
= sizeof(addr
);
2990 if ((s
= recvfrom(cluster_sockfd
, buf
, sizeof(buf
), MSG_WAITALL
, (void *) &addr
, &alen
)) > 0)
2992 processcluster(buf
, s
, addr
.sin_addr
.s_addr
);
2997 FD_CLR(cluster_sockfd
, &r
);
3003 if (udp_pkts
> 1 || tun_pkts
> 1 || cluster_pkts
> 1)
3004 STAT(multi_read_used
);
3006 if (c
>= config
->multi_read_count
)
3008 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
3009 config
->multi_read_count
, udp_pkts
, tun_pkts
, cluster_pkts
);
3011 STAT(multi_read_exceeded
);
3015 // Runs on every machine (master and slaves).
3016 if (cluster_sockfd
&& next_cluster_ping
<= TIME
)
3018 // Check to see which of the cluster is still alive..
3020 cluster_send_ping(basetime
); // Only does anything if we're a slave
3021 cluster_check_master(); // ditto.
3023 cluster_heartbeat(); // Only does anything if we're a master.
3024 cluster_check_slaves(); // ditto.
3026 master_update_counts(); // If we're a slave, send our byte counters to our master.
3028 if (config
->cluster_iam_master
&& !config
->cluster_iam_uptodate
)
3029 next_cluster_ping
= TIME
+ 1; // out-of-date slaves, do fast updates
3031 next_cluster_ping
= TIME
+ config
->cluster_hb_interval
;
3034 // Run token bucket filtering queue..
3035 // Only run it every 1/10th of a second.
3036 // Runs on all machines both master and slave.
3038 static clockt last_run
= 0;
3039 if (last_run
!= TIME
)
3046 /* Handle timeouts. Make sure that this gets run anyway, even if there was
3047 * something to read, else under load this will never actually run....
3050 if (config
->cluster_iam_master
&& next_clean
<= time_now
)
3052 if (regular_cleanups())
3055 next_clean
= time_now
+ 1 ; // Didn't finish. Check quickly.
3059 next_clean
= time_now
+ config
->cleanup_interval
; // Did. Move to next interval.
3064 // Are we the master and shutting down??
3065 if (config
->cluster_iam_master
)
3066 cluster_heartbeat(); // Flush any queued changes..
3068 // Ok. Notify everyone we're shutting down. If we're
3069 // the master, this will force an election.
3070 cluster_send_ping(0);
3073 // Important!!! We MUST not process any packets past this point!
3076 static void stripdomain(char *host
)
3080 if ((p
= strchr(host
, '.')))
3086 FILE *resolv
= fopen("/etc/resolv.conf", "r");
3092 while (fgets(buf
, sizeof(buf
), resolv
))
3094 if (strncmp(buf
, "domain", 6) && strncmp(buf
, "search", 6))
3097 if (!isspace(buf
[6]))
3101 while (isspace(*b
)) b
++;
3106 while (*b
&& !isspace(*b
)) b
++;
3108 if (buf
[0] == 'd') // domain is canonical
3114 // first search line
3117 // hold, may be subsequent domain line
3118 strncpy(_domain
, d
, sizeof(_domain
))[sizeof(_domain
)-1] = 0;
3129 int hl
= strlen(host
);
3130 int dl
= strlen(domain
);
3131 if (dl
< hl
&& host
[hl
- dl
- 1] == '.' && !strcmp(host
+ hl
- dl
, domain
))
3132 host
[hl
-dl
- 1] = 0;
3136 *p
= 0; // everything after first dot
3141 // Init data structures
3142 static void initdata(int optdebug
, char *optconfig
)
3146 if (!(_statistics
= shared_malloc(sizeof(struct Tstats
))))
3148 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno
));
3151 if (!(config
= shared_malloc(sizeof(configt
))))
3153 LOG(0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno
));
3156 memset(config
, 0, sizeof(configt
));
3157 time(&config
->start_time
);
3158 strncpy(config
->config_file
, optconfig
, strlen(optconfig
));
3159 config
->debug
= optdebug
;
3160 config
->num_tbfs
= MAXTBFS
;
3161 config
->rl_rate
= 28; // 28kbps
3162 strcpy(config
->random_device
, RANDOMDEVICE
);
3164 if (!(tunnel
= shared_malloc(sizeof(tunnelt
) * MAXTUNNEL
)))
3166 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno
));
3169 if (!(session
= shared_malloc(sizeof(sessiont
) * MAXSESSION
)))
3171 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno
));
3175 if (!(sess_local
= shared_malloc(sizeof(sessionlocalt
) * MAXSESSION
)))
3177 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno
));
3181 if (!(radius
= shared_malloc(sizeof(radiust
) * MAXRADIUS
)))
3183 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno
));
3187 if (!(ip_address_pool
= shared_malloc(sizeof(ippoolt
) * MAXIPPOOL
)))
3189 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno
));
3193 if (!(ip_filters
= shared_malloc(sizeof(ip_filtert
) * MAXFILTER
)))
3195 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno
));
3198 memset(ip_filters
, 0, sizeof(ip_filtert
) * MAXFILTER
);
3201 if (!(ringbuffer
= shared_malloc(sizeof(struct Tringbuffer
))))
3203 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno
));
3206 memset(ringbuffer
, 0, sizeof(struct Tringbuffer
));
3209 if (!(cli_session_actions
= shared_malloc(sizeof(struct cli_session_actions
) * MAXSESSION
)))
3211 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno
));
3214 memset(cli_session_actions
, 0, sizeof(struct cli_session_actions
) * MAXSESSION
);
3216 if (!(cli_tunnel_actions
= shared_malloc(sizeof(struct cli_tunnel_actions
) * MAXSESSION
)))
3218 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno
));
3221 memset(cli_tunnel_actions
, 0, sizeof(struct cli_tunnel_actions
) * MAXSESSION
);
3223 memset(tunnel
, 0, sizeof(tunnelt
) * MAXTUNNEL
);
3224 memset(session
, 0, sizeof(sessiont
) * MAXSESSION
);
3225 memset(radius
, 0, sizeof(radiust
) * MAXRADIUS
);
3226 memset(ip_address_pool
, 0, sizeof(ippoolt
) * MAXIPPOOL
);
3228 // Put all the sessions on the free list marked as undefined.
3229 for (i
= 1; i
< MAXSESSION
; i
++)
3231 session
[i
].next
= i
+ 1;
3232 session
[i
].tunnel
= T_UNDEF
; // mark it as not filled in.
3234 session
[MAXSESSION
- 1].next
= 0;
3237 // Mark all the tunnels as undefined (waiting to be filled in by a download).
3238 for (i
= 1; i
< MAXTUNNEL
; i
++)
3239 tunnel
[i
].state
= TUNNELUNDEF
; // mark it as not filled in.
3243 // Grab my hostname unless it's been specified
3244 gethostname(hostname
, sizeof(hostname
));
3245 stripdomain(hostname
);
3248 _statistics
->start_time
= _statistics
->last_reset
= time(NULL
);
3251 if (!(bgp_peers
= shared_malloc(sizeof(struct bgp_peer
) * BGP_NUM_PEERS
)))
3253 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno
));
3259 static int assign_ip_address(sessionidt s
)
3263 time_t best_time
= time_now
;
3264 char *u
= session
[s
].user
;
3268 CSTAT(assign_ip_address
);
3270 for (i
= 1; i
< ip_pool_size
; i
++)
3272 if (!ip_address_pool
[i
].address
|| ip_address_pool
[i
].assigned
)
3275 if (!session
[s
].walled_garden
&& ip_address_pool
[i
].user
[0] && !strcmp(u
, ip_address_pool
[i
].user
))
3282 if (ip_address_pool
[i
].last
< best_time
)
3285 if (!(best_time
= ip_address_pool
[i
].last
))
3286 break; // never used, grab this one
3292 LOG(0, s
, session
[s
].tunnel
, "assign_ip_address(): out of addresses\n");
3296 session
[s
].ip
= ip_address_pool
[best
].address
;
3297 session
[s
].ip_pool_index
= best
;
3298 ip_address_pool
[best
].assigned
= 1;
3299 ip_address_pool
[best
].last
= time_now
;
3300 ip_address_pool
[best
].session
= s
;
3301 if (session
[s
].walled_garden
)
3302 /* Don't track addresses of users in walled garden (note: this
3303 means that their address isn't "sticky" even if they get
3305 ip_address_pool
[best
].user
[0] = 0;
3307 strncpy(ip_address_pool
[best
].user
, u
, sizeof(ip_address_pool
[best
].user
) - 1);
3310 LOG(4, s
, session
[s
].tunnel
, "assign_ip_address(): %s ip address %d from pool\n",
3311 reuse
? "Reusing" : "Allocating", best
);
3316 static void free_ip_address(sessionidt s
)
3318 int i
= session
[s
].ip_pool_index
;
3321 CSTAT(free_ip_address
);
3324 return; // what the?
3326 if (i
< 0) // Is this actually part of the ip pool?
3330 cache_ipmap(session
[s
].ip
, -i
); // Change the mapping to point back to the ip pool index.
3332 ip_address_pool
[i
].assigned
= 0;
3333 ip_address_pool
[i
].session
= 0;
3334 ip_address_pool
[i
].last
= time_now
;
3338 // Fsck the address pool against the session table.
3339 // Normally only called when we become a master.
3341 // This isn't perfect: We aren't keep tracking of which
3342 // users used to have an IP address.
3344 void rebuild_address_pool(void)
3349 // Zero the IP pool allocation, and build
3350 // a map from IP address to pool index.
3351 for (i
= 1; i
< MAXIPPOOL
; ++i
)
3353 ip_address_pool
[i
].assigned
= 0;
3354 ip_address_pool
[i
].session
= 0;
3355 if (!ip_address_pool
[i
].address
)
3358 cache_ipmap(ip_address_pool
[i
].address
, -i
); // Map pool IP to pool index.
3361 for (i
= 0; i
< MAXSESSION
; ++i
)
3364 if (!(session
[i
].opened
&& session
[i
].ip
))
3367 ipid
= - lookup_ipmap(htonl(session
[i
].ip
));
3369 if (session
[i
].ip_pool_index
< 0)
3371 // Not allocated out of the pool.
3372 if (ipid
< 1) // Not found in the pool either? good.
3375 LOG(0, i
, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
3376 i
, fmtaddr(session
[i
].ip
, 0), ipid
);
3378 // Fall through and process it as part of the pool.
3382 if (ipid
> MAXIPPOOL
|| ipid
< 0)
3384 LOG(0, i
, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i
, ipid
);
3386 session
[i
].ip_pool_index
= ipid
;
3390 ip_address_pool
[ipid
].assigned
= 1;
3391 ip_address_pool
[ipid
].session
= i
;
3392 ip_address_pool
[ipid
].last
= time_now
;
3393 strncpy(ip_address_pool
[ipid
].user
, session
[i
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3394 session
[i
].ip_pool_index
= ipid
;
3395 cache_ipmap(session
[i
].ip
, i
); // Fix the ip map.
3400 // Fix the address pool to match a changed session.
3401 // (usually when the master sends us an update).
3402 static void fix_address_pool(int sid
)
3406 ipid
= session
[sid
].ip_pool_index
;
3408 if (ipid
> ip_pool_size
)
3409 return; // Ignore it. rebuild_address_pool will fix it up.
3411 if (ip_address_pool
[ipid
].address
!= session
[sid
].ip
)
3412 return; // Just ignore it. rebuild_address_pool will take care of it.
3414 ip_address_pool
[ipid
].assigned
= 1;
3415 ip_address_pool
[ipid
].session
= sid
;
3416 ip_address_pool
[ipid
].last
= time_now
;
3417 strncpy(ip_address_pool
[ipid
].user
, session
[sid
].user
, sizeof(ip_address_pool
[ipid
].user
) - 1);
3421 // Add a block of addresses to the IP pool to hand out.
3423 static void add_to_ip_pool(in_addr_t addr
, in_addr_t mask
)
3427 mask
= 0xffffffff; // Host route only.
3431 if (ip_pool_size
>= MAXIPPOOL
) // Pool is full!
3434 for (i
= addr
;(i
& mask
) == addr
; ++i
)
3436 if ((i
& 0xff) == 0 || (i
&0xff) == 255)
3437 continue; // Skip 0 and broadcast addresses.
3439 ip_address_pool
[ip_pool_size
].address
= i
;
3440 ip_address_pool
[ip_pool_size
].assigned
= 0;
3442 if (ip_pool_size
>= MAXIPPOOL
)
3444 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr
), 0));
3450 // Initialize the IP address pool
3451 static void initippool()
3456 memset(ip_address_pool
, 0, sizeof(ip_address_pool
));
3458 if (!(f
= fopen(IPPOOLFILE
, "r")))
3460 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE
": %s\n", strerror(errno
));
3464 while (ip_pool_size
< MAXIPPOOL
&& fgets(buf
, 4096, f
))
3467 buf
[4095] = 0; // Force it to be zero terminated/
3469 if (*buf
== '#' || *buf
== '\n')
3470 continue; // Skip comments / blank lines
3471 if ((p
= (char *)strrchr(buf
, '\n'))) *p
= 0;
3472 if ((p
= (char *)strchr(buf
, ':')))
3476 src
= inet_addr(buf
);
3477 if (src
== INADDR_NONE
)
3479 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf
);
3482 // This entry is for a specific IP only
3483 if (src
!= config
->bind_address
)
3488 if ((p
= (char *)strchr(pool
, '/')))
3492 in_addr_t start
= 0, mask
= 0;
3494 LOG(2, 0, 0, "Adding IP address range %s\n", buf
);
3496 if (!*p
|| !(numbits
= atoi(p
)))
3498 LOG(0, 0, 0, "Invalid pool range %s\n", buf
);
3501 start
= ntohl(inet_addr(pool
));
3502 mask
= (in_addr_t
) (pow(2, numbits
) - 1) << (32 - numbits
);
3504 // Add a static route for this pool
3505 LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
3506 fmtaddr(htonl(start
), 0), 32 + mask
);
3508 routeset(0, start
, mask
, 0, 1);
3510 add_to_ip_pool(start
, mask
);
3514 // It's a single ip address
3515 add_to_ip_pool(inet_addr(pool
), 0);
3519 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size
- 1);
3522 void snoop_send_packet(char *packet
, uint16_t size
, in_addr_t destination
, uint16_t port
)
3524 struct sockaddr_in snoop_addr
= {0};
3525 if (!destination
|| !port
|| snoopfd
<= 0 || size
<= 0 || !packet
)
3528 snoop_addr
.sin_family
= AF_INET
;
3529 snoop_addr
.sin_addr
.s_addr
= destination
;
3530 snoop_addr
.sin_port
= ntohs(port
);
3532 LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size
,
3533 fmtaddr(snoop_addr
.sin_addr
.s_addr
, 0),
3534 htons(snoop_addr
.sin_port
));
3536 if (sendto(snoopfd
, packet
, size
, MSG_DONTWAIT
| MSG_NOSIGNAL
, (void *) &snoop_addr
, sizeof(snoop_addr
)) < 0)
3537 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno
));
3539 STAT(packets_snooped
);
3542 static int dump_session(FILE **f
, sessiont
*s
)
3544 if (!s
->opened
|| !s
->ip
|| !(s
->cin
|| s
->cout
) || !*s
->user
|| s
->walled_garden
)
3549 char filename
[1024];
3551 time_t now
= time(NULL
);
3553 strftime(timestr
, sizeof(timestr
), "%Y%m%d%H%M%S", localtime(&now
));
3554 snprintf(filename
, sizeof(filename
), "%s/%s", config
->accounting_dir
, timestr
);
3556 if (!(*f
= fopen(filename
, "w")))
3558 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename
, strerror(errno
));
3562 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename
);
3563 fprintf(*f
, "# dslwatch.pl dump file V1.01\n"
3567 "# format: username ip qos uptxoctets downrxoctets\n",
3573 LOG(4, 0, 0, "Dumping accounting information for %s\n", s
->user
);
3574 fprintf(*f
, "%s %s %d %u %u\n",
3575 s
->user
, // username
3576 fmtaddr(htonl(s
->ip
), 0), // ip
3577 (s
->throttle_in
|| s
->throttle_out
) ? 2 : 1, // qos
3578 (uint32_t) s
->cin
, // uptxoctets
3579 (uint32_t) s
->cout
); // downrxoctets
3581 s
->pin
= s
->cin
= 0;
3582 s
->pout
= s
->cout
= 0;
3587 static void dump_acct_info(int all
)
3593 CSTAT(dump_acct_info
);
3597 for (i
= 0; i
< shut_acct_n
; i
++)
3598 dump_session(&f
, &shut_acct
[i
]);
3604 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
3605 dump_session(&f
, &session
[i
]);
3612 int main(int argc
, char *argv
[])
3616 char *optconfig
= CONFIGFILE
;
3618 time(&basetime
); // start clock
3621 while ((i
= getopt(argc
, argv
, "dvc:h:")) >= 0)
3626 if (fork()) exit(0);
3628 freopen("/dev/null", "r", stdin
);
3629 freopen("/dev/null", "w", stdout
);
3630 freopen("/dev/null", "w", stderr
);
3639 snprintf(hostname
, sizeof(hostname
), "%s", optarg
);
3642 printf("Args are:\n"
3643 "\t-d\t\tDetach from terminal\n"
3644 "\t-c <file>\tConfig file\n"
3645 "\t-h <hostname>\tForce hostname\n"
3653 // Start the timer routine off
3655 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3656 signal(SIGALRM
, sigalrm_handler
);
3657 siginterrupt(SIGALRM
, 0);
3660 initdata(optdebug
, optconfig
);
3664 init_tbf(config
->num_tbfs
);
3666 LOG(0, 0, 0, "L2TPNS version " VERSION
"\n");
3667 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
3668 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
3671 rlim
.rlim_cur
= RLIM_INFINITY
;
3672 rlim
.rlim_max
= RLIM_INFINITY
;
3673 // Remove the maximum core size
3674 if (setrlimit(RLIMIT_CORE
, &rlim
) < 0)
3675 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno
));
3677 // Make core dumps go to /tmp
3681 if (config
->scheduler_fifo
)
3684 struct sched_param params
= {0};
3685 params
.sched_priority
= 1;
3687 if (get_nprocs() < 2)
3689 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
3690 config
->scheduler_fifo
= 0;
3694 if ((ret
= sched_setscheduler(0, SCHED_FIFO
, ¶ms
)) == 0)
3696 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
3700 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno
));
3701 config
->scheduler_fifo
= 0;
3706 /* Set up the cluster communications port. */
3707 if (cluster_init() < 0)
3711 signal(SIGPIPE
, SIG_IGN
);
3712 bgp_setup(config
->as_number
);
3713 bgp_add_route(config
->bind_address
, 0xffffffff);
3714 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3716 if (config
->neighbour
[i
].name
[0])
3717 bgp_start(&bgp_peers
[i
], config
->neighbour
[i
].name
,
3718 config
->neighbour
[i
].as
, config
->neighbour
[i
].keepalive
,
3719 config
->neighbour
[i
].hold
, 0); /* 0 = routing disabled */
3724 LOG(1, 0, 0, "Set up on interface %s\n", config
->tundevice
);
3730 signal(SIGHUP
, sighup_handler
);
3731 signal(SIGTERM
, sigterm_handler
);
3732 signal(SIGINT
, sigterm_handler
);
3733 signal(SIGQUIT
, sigquit_handler
);
3734 signal(SIGCHLD
, sigchild_handler
);
3736 // Prevent us from getting paged out
3737 if (config
->lock_pages
)
3739 if (!mlockall(MCL_CURRENT
))
3740 LOG(1, 0, 0, "Locking pages into memory\n");
3742 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno
));
3747 // Drop privileges here
3748 if (config
->target_uid
> 0 && geteuid() == 0)
3749 setuid(config
->target_uid
);
3754 /* try to shut BGP down cleanly; with luck the sockets will be
3755 writable since we're out of the select */
3756 for (i
= 0; i
< BGP_NUM_PEERS
; i
++)
3757 if (bgp_peers
[i
].state
== Established
)
3758 bgp_stop(&bgp_peers
[i
]);
3761 /* remove plugins (so cleanup code gets run) */
3764 // Remove the PID file if we wrote it
3765 if (config
->wrote_pid
&& *config
->pid_file
== '/')
3766 unlink(config
->pid_file
);
3768 /* kill CLI children */
3769 signal(SIGTERM
, SIG_IGN
);
3774 static void sighup_handler(int sig
)
3776 if (log_stream
&& log_stream
!= stderr
)
3785 static void sigalrm_handler(int sig
)
3787 // Log current traffic stats
3789 snprintf(config
->bandwidth
, sizeof(config
->bandwidth
),
3790 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
3791 (udp_rx
/ 1024.0 / 1024.0 * 8),
3792 (eth_tx
/ 1024.0 / 1024.0 * 8),
3793 (eth_rx
/ 1024.0 / 1024.0 * 8),
3794 (udp_tx
/ 1024.0 / 1024.0 * 8),
3795 ((udp_tx
+ udp_rx
+ eth_tx
+ eth_rx
) / 1024.0 / 1024.0 * 8),
3796 udp_rx_pkt
, eth_rx_pkt
);
3798 udp_tx
= udp_rx
= 0;
3799 udp_rx_pkt
= eth_rx_pkt
= 0;
3800 eth_tx
= eth_rx
= 0;
3802 if (config
->dump_speed
)
3803 printf("%s\n", config
->bandwidth
);
3805 // Update the internal time counter
3807 strftime(time_now_string
, sizeof(time_now_string
), "%Y-%m-%d %H:%M:%S", localtime(&time_now
));
3812 struct param_timer p
= { time_now
};
3813 run_plugins(PLUGIN_TIMER
, &p
);
3818 static void sigterm_handler(int sig
)
3820 LOG(1, 0, 0, "Shutting down cleanly\n");
3824 static void sigquit_handler(int sig
)
3828 LOG(1, 0, 0, "Shutting down without saving sessions\n");
3830 if (config
->cluster_iam_master
)
3832 for (i
= 1; i
< MAXSESSION
; i
++)
3834 if (session
[i
].opened
)
3835 sessionkill(i
, "L2TPNS Closing");
3837 for (i
= 1; i
< MAXTUNNEL
; i
++)
3839 if (tunnel
[i
].ip
|| tunnel
[i
].state
)
3840 tunnelshutdown(i
, "L2TPNS Closing", 6, 0, 0);
3847 static void sigchild_handler(int sig
)
3849 while (waitpid(-1, NULL
, WNOHANG
) > 0)
3853 static void build_chap_response(char *challenge
, uint8_t id
, uint16_t challenge_length
, char **challenge_response
)
3856 *challenge_response
= NULL
;
3858 if (!*config
->l2tpsecret
)
3860 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
3864 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
3866 *challenge_response
= (char *)calloc(17, 1);
3869 MD5Update(&ctx
, &id
, 1);
3870 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
3871 MD5Update(&ctx
, challenge
, challenge_length
);
3872 MD5Final(*challenge_response
, &ctx
);
3877 static int facility_value(char *name
)
3880 for (i
= 0; facilitynames
[i
].c_name
; i
++)
3882 if (strcmp(facilitynames
[i
].c_name
, name
) == 0)
3883 return facilitynames
[i
].c_val
;
3888 static void update_config()
3892 static int timeout
= 0;
3893 static int interval
= 0;
3904 if (*config
->log_filename
)
3906 if (strstr(config
->log_filename
, "syslog:") == config
->log_filename
)
3908 char *p
= config
->log_filename
+ 7;
3911 openlog("l2tpns", LOG_PID
, facility_value(p
));
3915 else if (strchr(config
->log_filename
, '/') == config
->log_filename
)
3917 if ((log_stream
= fopen((char *)(config
->log_filename
), "a")))
3919 fseek(log_stream
, 0, SEEK_END
);
3920 setbuf(log_stream
, NULL
);
3924 log_stream
= stderr
;
3925 setbuf(log_stream
, NULL
);
3931 log_stream
= stderr
;
3932 setbuf(log_stream
, NULL
);
3936 config
->numradiusservers
= 0;
3937 for (i
= 0; i
< MAXRADSERVER
; i
++)
3938 if (config
->radiusserver
[i
])
3940 config
->numradiusservers
++;
3941 // Set radius port: if not set, take the port from the
3942 // first radius server. For the first radius server,
3943 // take the #defined default value from l2tpns.h
3945 // test twice, In case someone works with
3946 // a secondary radius server without defining
3947 // a primary one, this will work even then.
3948 if (i
>0 && !config
->radiusport
[i
])
3949 config
->radiusport
[i
] = config
->radiusport
[i
-1];
3950 if (!config
->radiusport
[i
])
3951 config
->radiusport
[i
] = RADPORT
;
3954 if (!config
->numradiusservers
)
3955 LOG(0, 0, 0, "No RADIUS servers defined!\n");
3957 config
->num_radfds
= 2 << RADIUS_SHIFT
;
3959 // parse radius_authtypes_s
3960 config
->radius_authtypes
= config
->radius_authprefer
= 0;
3961 p
= config
->radius_authtypes_s
;
3964 char *s
= strpbrk(p
, " \t,");
3970 while (*s
== ' ' || *s
== '\t')
3977 if (!strncasecmp("chap", p
, strlen(p
)))
3979 else if (!strncasecmp("pap", p
, strlen(p
)))
3982 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"", p
);
3984 config
->radius_authtypes
|= type
;
3985 if (!config
->radius_authprefer
)
3986 config
->radius_authprefer
= type
;
3989 if (!config
->radius_authtypes
)
3991 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
3992 config
->radius_authtypes
= config
->radius_authprefer
= AUTHPAP
;
3995 // normalise radius_authtypes_s
3996 if (config
->radius_authprefer
== AUTHPAP
)
3998 strcpy(config
->radius_authtypes_s
, "pap");
3999 if (config
->radius_authtypes
& AUTHCHAP
)
4000 strcat(config
->radius_authtypes_s
, ", chap");
4004 strcpy(config
->radius_authtypes_s
, "chap");
4005 if (config
->radius_authtypes
& AUTHPAP
)
4006 strcat(config
->radius_authtypes_s
, ", pap");
4009 // re-initialise the random number source
4010 initrandom(config
->random_device
);
4013 for (i
= 0; i
< MAXPLUGINS
; i
++)
4015 if (strcmp(config
->plugins
[i
], config
->old_plugins
[i
]) == 0)
4018 if (*config
->plugins
[i
])
4021 add_plugin(config
->plugins
[i
]);
4023 else if (*config
->old_plugins
[i
])
4026 remove_plugin(config
->old_plugins
[i
]);
4030 memcpy(config
->old_plugins
, config
->plugins
, sizeof(config
->plugins
));
4031 if (!config
->cleanup_interval
) config
->cleanup_interval
= 10;
4032 if (!config
->multi_read_count
) config
->multi_read_count
= 10;
4033 if (!config
->cluster_address
) config
->cluster_address
= inet_addr(DEFAULT_MCAST_ADDR
);
4034 if (!*config
->cluster_interface
)
4035 strncpy(config
->cluster_interface
, DEFAULT_MCAST_INTERFACE
, sizeof(config
->cluster_interface
) - 1);
4037 if (!config
->cluster_hb_interval
)
4038 config
->cluster_hb_interval
= PING_INTERVAL
; // Heartbeat every 0.5 seconds.
4040 if (!config
->cluster_hb_timeout
)
4041 config
->cluster_hb_timeout
= HB_TIMEOUT
; // 10 missed heartbeat triggers an election.
4043 if (interval
!= config
->cluster_hb_interval
|| timeout
!= config
->cluster_hb_timeout
)
4045 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
4046 // late, ensure we're sufficiently larger than that
4047 int t
= 4 * config
->cluster_hb_interval
+ 11;
4049 if (config
->cluster_hb_timeout
< t
)
4051 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config
->cluster_hb_timeout
, t
);
4052 config
->cluster_hb_timeout
= t
;
4055 // Push timing changes to the slaves immediately if we're the master
4056 if (config
->cluster_iam_master
)
4057 cluster_heartbeat();
4059 interval
= config
->cluster_hb_interval
;
4060 timeout
= config
->cluster_hb_timeout
;
4064 if (*config
->pid_file
== '/' && !config
->wrote_pid
)
4067 if ((f
= fopen(config
->pid_file
, "w")))
4069 fprintf(f
, "%d\n", getpid());
4071 config
->wrote_pid
= 1;
4075 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config
->pid_file
, strerror(errno
));
4079 config
->reload_config
= 0;
4082 static void read_config_file()
4086 if (!config
->config_file
) return;
4087 if (!(f
= fopen(config
->config_file
, "r")))
4089 fprintf(stderr
, "Can't open config file %s: %s\n", config
->config_file
, strerror(errno
));
4093 LOG(3, 0, 0, "Reading config file %s\n", config
->config_file
);
4095 LOG(3, 0, 0, "Done reading config file\n");
4100 int sessionsetup(tunnelidt t
, sessionidt s
)
4102 // A session now exists, set it up
4108 CSTAT(sessionsetup
);
4110 LOG(3, s
, t
, "Doing session setup for session\n");
4114 assign_ip_address(s
);
4117 LOG(0, s
, t
, " No IP allocated. The IP address pool is FULL!\n");
4118 sessionshutdown(s
, "No IP addresses available", 2, 7);
4121 LOG(3, s
, t
, " No IP allocated. Assigned %s from pool\n",
4122 fmtaddr(htonl(session
[s
].ip
), 0));
4126 // Make sure this is right
4127 session
[s
].tunnel
= t
;
4129 // zap old sessions with same IP and/or username
4130 // Don't kill gardened sessions - doing so leads to a DoS
4131 // from someone who doesn't need to know the password
4134 user
= session
[s
].user
;
4135 for (i
= 1; i
<= config
->cluster_highest_sessionid
; i
++)
4137 if (i
== s
) continue;
4138 if (ip
== session
[i
].ip
) sessionkill(i
, "Duplicate IP address");
4139 if (!session
[s
].walled_garden
&& !session
[i
].walled_garden
&& strcasecmp(user
, session
[i
].user
) == 0)
4140 sessionkill(i
, "Duplicate session for users");
4147 // Add the route for this session.
4148 for (r
= 0; r
< MAXROUTE
&& session
[s
].route
[r
].ip
; r
++)
4150 if ((session
[s
].ip
& session
[s
].route
[r
].mask
) ==
4151 (session
[s
].route
[r
].ip
& session
[s
].route
[r
].mask
))
4154 routeset(s
, session
[s
].route
[r
].ip
, session
[s
].route
[r
].mask
, 0, 1);
4157 // Static IPs need to be routed if not already
4158 // convered by a Framed-Route. Anything else is part
4159 // of the IP address pool and is already routed, it
4160 // just needs to be added to the IP cache.
4161 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
4162 if (session
[s
].ip_pool_index
== -1) // static ip
4164 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 1);
4167 cache_ipmap(session
[s
].ip
, s
);
4170 if (!session
[s
].unique_id
)
4172 // did this session just finish radius?
4173 LOG(3, s
, t
, "Sending initial IPCP to client\n");
4175 session
[s
].unique_id
= ++last_id
;
4178 // Run the plugin's against this new session.
4180 struct param_new_session data
= { &tunnel
[t
], &session
[s
] };
4181 run_plugins(PLUGIN_NEW_SESSION
, &data
);
4184 // Allocate TBFs if throttled
4185 if (session
[s
].throttle_in
|| session
[s
].throttle_out
)
4186 throttle_session(s
, session
[s
].throttle_in
, session
[s
].throttle_out
);
4188 session
[s
].last_packet
= time_now
;
4190 LOG(2, s
, t
, "Login by %s at %s from %s (%s)\n", session
[s
].user
,
4191 fmtaddr(htonl(session
[s
].ip
), 0),
4192 fmtaddr(htonl(tunnel
[t
].ip
), 1), tunnel
[t
].hostname
);
4194 cluster_send_session(s
); // Mark it as dirty, and needing to the flooded to the cluster.
4196 return 1; // RADIUS OK and IP allocated, done...
4200 // This session just got dropped on us by the master or something.
4201 // Make sure our tables up up to date...
4203 int load_session(sessionidt s
, sessiont
*new)
4209 if (new->ip_pool_index
>= MAXIPPOOL
||
4210 new->tunnel
>= MAXTUNNEL
)
4212 LOG(0, s
, 0, "Strange session update received!\n");
4213 // FIXME! What to do here?
4218 // Ok. All sanity checks passed. Now we're committed to
4219 // loading the new session.
4222 session
[s
].tunnel
= new->tunnel
; // For logging in cache_ipmap
4224 // See if routes/ip cache need updating
4225 if (new->ip
!= session
[s
].ip
)
4228 for (i
= 0; !newip
&& i
< MAXROUTE
&& (session
[s
].route
[i
].ip
|| new->route
[i
].ip
); i
++)
4229 if (new->route
[i
].ip
!= session
[s
].route
[i
].ip
||
4230 new->route
[i
].mask
!= session
[s
].route
[i
].mask
)
4238 // remove old routes...
4239 for (i
= 0; i
< MAXROUTE
&& session
[s
].route
[i
].ip
; i
++)
4241 if ((session
[s
].ip
& session
[s
].route
[i
].mask
) ==
4242 (session
[s
].route
[i
].ip
& session
[s
].route
[i
].mask
))
4245 routeset(s
, session
[s
].route
[i
].ip
, session
[s
].route
[i
].mask
, 0, 0);
4251 if (session
[s
].ip_pool_index
== -1) // static IP
4253 if (!routed
) routeset(s
, session
[s
].ip
, 0, 0, 0);
4255 else // It's part of the IP pool, remove it manually.
4256 uncache_ipmap(session
[s
].ip
);
4261 // add new routes...
4262 for (i
= 0; i
< MAXROUTE
&& new->route
[i
].ip
; i
++)
4264 if ((new->ip
& new->route
[i
].mask
) ==
4265 (new->route
[i
].ip
& new->route
[i
].mask
))
4268 routeset(s
, new->route
[i
].ip
, new->route
[i
].mask
, 0, 1);
4274 // If there's a new one, add it.
4275 if (new->ip_pool_index
== -1)
4277 if (!routed
) routeset(s
, new->ip
, 0, 0, 1);
4280 cache_ipmap(new->ip
, s
);
4285 if (new->flags
& SF_IPV6_ROUTED
&& !(session
[s
].flags
& SF_IPV6_ROUTED
))
4286 route6set(s
, new->ipv6route
, new->ipv6prefixlen
, 1);
4289 if (new->filter_in
&& (new->filter_in
> MAXFILTER
|| !ip_filters
[new->filter_in
- 1].name
[0]))
4291 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid input filter %d\n", (int) new->filter_in
);
4295 if (new->filter_out
&& (new->filter_out
> MAXFILTER
|| !ip_filters
[new->filter_out
- 1].name
[0]))
4297 LOG(2, s
, session
[s
].tunnel
, "Dropping invalid output filter %d\n", (int) new->filter_out
);
4298 new->filter_out
= 0;
4301 if (new->filter_in
!= session
[s
].filter_in
)
4303 if (session
[s
].filter_in
) ip_filters
[session
[s
].filter_in
- 1].used
--;
4304 if (new->filter_in
) ip_filters
[new->filter_in
- 1].used
++;
4307 if (new->filter_out
!= session
[s
].filter_out
)
4309 if (session
[s
].filter_out
) ip_filters
[session
[s
].filter_out
- 1].used
--;
4310 if (new->filter_out
) ip_filters
[new->filter_out
- 1].used
++;
4313 if (new->tunnel
&& s
> config
->cluster_highest_sessionid
) // Maintain this in the slave. It's used
4314 // for walking the sessions to forward byte counts to the master.
4315 config
->cluster_highest_sessionid
= s
;
4317 // TEMP: old session struct used a uint32_t to define the throttle
4318 // speed for both up/down, new uses a uint16_t for each. Deal with
4319 // sessions from an old master for migration.
4320 if (new->throttle_out
== 0 && new->tbf_out
)
4321 new->throttle_out
= new->throttle_in
;
4323 memcpy(&session
[s
], new, sizeof(session
[s
])); // Copy over..
4325 // Do fixups into address pool.
4326 if (new->ip_pool_index
!= -1)
4327 fix_address_pool(s
);
4332 static void initplugins()
4336 loaded_plugins
= ll_init();
4337 // Initialize the plugins to nothing
4338 for (i
= 0; i
< MAX_PLUGIN_TYPES
; i
++)
4339 plugins
[i
] = ll_init();
4342 static void *open_plugin(char *plugin_name
, int load
)
4344 char path
[256] = "";
4346 snprintf(path
, 256, PLUGINDIR
"/%s.so", plugin_name
);
4347 LOG(2, 0, 0, "%soading plugin from %s\n", load
? "L" : "Un-l", path
);
4348 return dlopen(path
, RTLD_NOW
);
4351 // plugin callback to get a config value
4352 static void *getconfig(char *key
, enum config_typet type
)
4356 for (i
= 0; config_values
[i
].key
; i
++)
4358 if (!strcmp(config_values
[i
].key
, key
))
4360 if (config_values
[i
].type
== type
)
4361 return ((void *) config
) + config_values
[i
].offset
;
4363 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
4364 key
, type
, config_values
[i
].type
);
4370 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key
);
4374 static int add_plugin(char *plugin_name
)
4376 static struct pluginfuncs funcs
= {
4381 sessiontbysessionidt
,
4382 sessionidtbysessiont
,
4388 cluster_send_session
,
4391 void *p
= open_plugin(plugin_name
, 1);
4392 int (*initfunc
)(struct pluginfuncs
*);
4397 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
4401 if (ll_contains(loaded_plugins
, p
))
4404 return 0; // already loaded
4408 int *v
= dlsym(p
, "plugin_api_version");
4409 if (!v
|| *v
!= PLUGIN_API_VERSION
)
4411 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
4417 if ((initfunc
= dlsym(p
, "plugin_init")))
4419 if (!initfunc(&funcs
))
4421 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
4427 ll_push(loaded_plugins
, p
);
4429 for (i
= 0; i
< max_plugin_functions
; i
++)
4432 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4434 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions
[i
]);
4435 ll_push(plugins
[i
], x
);
4439 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name
);
4443 static void run_plugin_done(void *plugin
)
4445 int (*donefunc
)(void) = dlsym(plugin
, "plugin_done");
4451 static int remove_plugin(char *plugin_name
)
4453 void *p
= open_plugin(plugin_name
, 0);
4459 if (ll_contains(loaded_plugins
, p
))
4462 for (i
= 0; i
< max_plugin_functions
; i
++)
4465 if (plugin_functions
[i
] && (x
= dlsym(p
, plugin_functions
[i
])))
4466 ll_delete(plugins
[i
], x
);
4469 ll_delete(loaded_plugins
, p
);
4475 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name
);
4479 int run_plugins(int plugin_type
, void *data
)
4481 int (*func
)(void *data
);
4483 if (!plugins
[plugin_type
] || plugin_type
> max_plugin_functions
)
4484 return PLUGIN_RET_ERROR
;
4486 ll_reset(plugins
[plugin_type
]);
4487 while ((func
= ll_next(plugins
[plugin_type
])))
4491 if (r
!= PLUGIN_RET_OK
)
4492 return r
; // stop here
4495 return PLUGIN_RET_OK
;
4498 static void plugins_done()
4502 ll_reset(loaded_plugins
);
4503 while ((p
= ll_next(loaded_plugins
)))
4507 static void processcontrol(uint8_t * buf
, int len
, struct sockaddr_in
*addr
, int alen
)
4509 struct nsctl request
;
4510 struct nsctl response
;
4511 int type
= unpack_control(&request
, buf
, len
);
4515 if (log_stream
&& config
->debug
>= 4)
4519 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
4520 fmtaddr(addr
->sin_addr
.s_addr
, 0), type
);
4524 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4525 dump_control(&request
, log_stream
);
4531 case NSCTL_REQ_LOAD
:
4532 if (request
.argc
!= 1)
4534 response
.type
= NSCTL_RES_ERR
;
4536 response
.argv
[0] = "name of plugin required";
4538 else if ((r
= add_plugin(request
.argv
[0])) < 1)
4540 response
.type
= NSCTL_RES_ERR
;
4542 response
.argv
[0] = !r
4543 ? "plugin already loaded"
4544 : "error loading plugin";
4548 response
.type
= NSCTL_RES_OK
;
4554 case NSCTL_REQ_UNLOAD
:
4555 if (request
.argc
!= 1)
4557 response
.type
= NSCTL_RES_ERR
;
4559 response
.argv
[0] = "name of plugin required";
4561 else if ((r
= remove_plugin(request
.argv
[0])) < 1)
4563 response
.type
= NSCTL_RES_ERR
;
4565 response
.argv
[0] = !r
4566 ? "plugin not loaded"
4567 : "plugin not found";
4571 response
.type
= NSCTL_RES_OK
;
4577 case NSCTL_REQ_HELP
:
4578 response
.type
= NSCTL_RES_OK
;
4581 ll_reset(loaded_plugins
);
4582 while ((p
= ll_next(loaded_plugins
)))
4584 char **help
= dlsym(p
, "plugin_control_help");
4585 while (response
.argc
< 0xff && help
&& *help
)
4586 response
.argv
[response
.argc
++] = *help
++;
4591 case NSCTL_REQ_CONTROL
:
4593 struct param_control param
= {
4594 config
->cluster_iam_master
,
4601 int r
= run_plugins(PLUGIN_CONTROL
, ¶m
);
4603 if (r
== PLUGIN_RET_ERROR
)
4605 response
.type
= NSCTL_RES_ERR
;
4607 response
.argv
[0] = param
.additional
4609 : "error returned by plugin";
4611 else if (r
== PLUGIN_RET_NOTMASTER
)
4613 static char msg
[] = "must be run on master: 000.000.000.000";
4615 response
.type
= NSCTL_RES_ERR
;
4617 if (config
->cluster_master_address
)
4619 strcpy(msg
+ 23, fmtaddr(config
->cluster_master_address
, 0));
4620 response
.argv
[0] = msg
;
4624 response
.argv
[0] = "must be run on master: none elected";
4627 else if (!(param
.response
& NSCTL_RESPONSE
))
4629 response
.type
= NSCTL_RES_ERR
;
4631 response
.argv
[0] = param
.response
4632 ? "unrecognised response value from plugin"
4633 : "unhandled action";
4637 response
.type
= param
.response
;
4639 if (param
.additional
)
4642 response
.argv
[0] = param
.additional
;
4650 response
.type
= NSCTL_RES_ERR
;
4652 response
.argv
[0] = "error unpacking control packet";
4655 buf
= calloc(NSCTL_MAX_PKT_SZ
, 1);
4658 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
4662 r
= pack_control(buf
, NSCTL_MAX_PKT_SZ
, response
.type
, response
.argc
, response
.argv
);
4665 sendto(controlfd
, buf
, r
, 0, (const struct sockaddr
*) addr
, alen
);
4666 if (log_stream
&& config
->debug
>= 4)
4668 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr
->sin_addr
.s_addr
, 0));
4669 dump_control(&response
, log_stream
);
4673 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
4674 fmtaddr(addr
->sin_addr
.s_addr
, 0), r
);
4679 static tunnelidt
new_tunnel()
4682 for (i
= 1; i
< MAXTUNNEL
; i
++)
4684 if (tunnel
[i
].state
== TUNNELFREE
)
4686 LOG(4, 0, i
, "Assigning tunnel ID %d\n", i
);
4687 if (i
> config
->cluster_highest_tunnelid
)
4688 config
->cluster_highest_tunnelid
= i
;
4692 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
4697 // We're becoming the master. Do any required setup..
4699 // This is principally telling all the plugins that we're
4700 // now a master, and telling them about all the sessions
4701 // that are active too..
4703 void become_master(void)
4706 run_plugins(PLUGIN_BECOME_MASTER
, NULL
);
4708 // running a bunch of iptables commands is slow and can cause
4709 // the master to drop tunnels on takeover--kludge around the
4710 // problem by forking for the moment (note: race)
4711 if (!fork_and_close())
4713 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4715 if (!session
[s
].opened
) // Not an in-use session.
4718 run_plugins(PLUGIN_NEW_SESSION_MASTER
, &session
[s
]);
4724 for (i
= 0; i
< config
->num_radfds
; i
++)
4726 FD_SET(radfds
[i
], &readset
);
4727 if (radfds
[i
] > readset_n
)
4728 readset_n
= radfds
[i
];
4732 int cmd_show_hist_idle(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4738 if (CLI_HELP_REQUESTED
)
4739 return CLI_HELP_NO_ARGS
;
4742 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4744 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4747 if (!session
[s
].opened
)
4750 idle
= time_now
- session
[s
].last_packet
;
4751 idle
/= 5 ; // In multiples of 5 seconds.
4761 for (i
= 0; i
< 63; ++i
)
4763 cli_print(cli
, "%3d seconds : %7.2f%% (%6d)", i
* 5, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4765 cli_print(cli
, "lots of secs : %7.2f%% (%6d)", (double) buckets
[63] * 100.0 / count
, buckets
[i
]);
4766 cli_print(cli
, "%d total sessions open.", count
);
4770 int cmd_show_hist_open(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
4776 if (CLI_HELP_REQUESTED
)
4777 return CLI_HELP_NO_ARGS
;
4780 for (i
= 0; i
< 64;++i
) buckets
[i
] = 0;
4782 for (s
= 1; s
<= config
->cluster_highest_sessionid
; ++s
)
4785 if (!session
[s
].opened
)
4788 d
= time_now
- session
[s
].opened
;
4791 while (d
> 1 && open
< 32)
4801 for (i
= 0; i
< 30; ++i
)
4803 cli_print(cli
, " < %8d seconds : %7.2f%% (%6d)", s
, (double) buckets
[i
] * 100.0 / count
, buckets
[i
]);
4806 cli_print(cli
, "%d total sessions open.", count
);
4812 * This unencodes the AVP using the L2TP secret and the previously
4813 * stored random vector. It overwrites the hidden data with the
4814 * unhidden AVP subformat.
4816 static void unhide_value(uint8_t *value
, size_t len
, uint16_t type
, uint8_t *vector
, size_t vec_len
)
4823 // Compute initial pad
4825 MD5Update(&ctx
, (uint8_t) (type
>> 8) & 0xff, 1);
4826 MD5Update(&ctx
, (uint8_t) type
& 0xff, 1);
4827 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4828 MD5Update(&ctx
, vector
, vec_len
);
4829 MD5Final(digest
, &ctx
);
4831 // pointer to last decoded 16 octets
4836 // calculate a new pad based on the last decoded block
4837 if (d
>= sizeof(digest
))
4840 MD5Update(&ctx
, config
->l2tpsecret
, strlen(config
->l2tpsecret
));
4841 MD5Update(&ctx
, last
, sizeof(digest
));
4842 MD5Final(digest
, &ctx
);
4848 *value
++ ^= digest
[d
++];
4853 static int ip_filter_port(ip_filter_portt
*p
, uint16_t port
)
4857 case FILTER_PORT_OP_EQ
: return port
== p
->port
;
4858 case FILTER_PORT_OP_NEQ
: return port
!= p
->port
;
4859 case FILTER_PORT_OP_GT
: return port
> p
->port
;
4860 case FILTER_PORT_OP_LT
: return port
< p
->port
;
4861 case FILTER_PORT_OP_RANGE
: return port
>= p
->port
&& port
<= p
->port2
;
4867 static int ip_filter_flag(uint8_t op
, uint8_t sflags
, uint8_t cflags
, uint8_t flags
)
4871 case FILTER_FLAG_OP_ANY
:
4872 return (flags
& sflags
) || (~flags
& cflags
);
4874 case FILTER_FLAG_OP_ALL
:
4875 return (flags
& sflags
) == sflags
&& (~flags
& cflags
) == cflags
;
4877 case FILTER_FLAG_OP_EST
:
4878 return (flags
& (TCP_FLAG_ACK
|TCP_FLAG_RST
)) && (~flags
& TCP_FLAG_SYN
);
4884 int ip_filter(uint8_t *buf
, int len
, uint8_t filter
)
4886 uint16_t frag_offset
;
4890 uint16_t src_port
= 0;
4891 uint16_t dst_port
= 0;
4893 ip_filter_rulet
*rule
;
4895 if (len
< 20) // up to end of destination address
4898 if ((*buf
>> 4) != 4) // IPv4
4901 frag_offset
= ntohs(*(uint16_t *) (buf
+ 6)) & 0x1fff;
4903 src_ip
= *(in_addr_t
*) (buf
+ 12);
4904 dst_ip
= *(in_addr_t
*) (buf
+ 16);
4906 if (frag_offset
== 0 && (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
))
4908 int l
= (buf
[0] & 0xf) * 4; // length of IP header
4909 if (len
< l
+ 4) // ports
4912 src_port
= ntohs(*(uint16_t *) (buf
+ l
));
4913 dst_port
= ntohs(*(uint16_t *) (buf
+ l
+ 2));
4914 if (proto
== IPPROTO_TCP
)
4916 if (len
< l
+ 14) // flags
4919 flags
= buf
[l
+ 13] & 0x3f;
4923 for (rule
= ip_filters
[filter
].rules
; rule
->action
; rule
++)
4925 if (rule
->proto
!= IPPROTO_IP
&& proto
!= rule
->proto
)
4928 if (rule
->src_wild
!= INADDR_BROADCAST
&&
4929 (src_ip
& ~rule
->src_wild
) != (rule
->src_ip
& ~rule
->src_wild
))
4932 if (rule
->dst_wild
!= INADDR_BROADCAST
&&
4933 (dst_ip
& ~rule
->dst_wild
) != (rule
->dst_ip
& ~rule
->dst_wild
))
4938 if (!rule
->frag
|| rule
->action
== FILTER_ACTION_DENY
)
4946 if (proto
== IPPROTO_TCP
|| proto
== IPPROTO_UDP
)
4948 if (rule
->src_ports
.op
&& !ip_filter_port(&rule
->src_ports
, src_port
))
4951 if (rule
->dst_ports
.op
&& !ip_filter_port(&rule
->dst_ports
, dst_port
))
4954 if (proto
== IPPROTO_TCP
&& rule
->tcp_flag_op
&&
4955 !ip_filter_flag(rule
->tcp_flag_op
, rule
->tcp_sflags
, rule
->tcp_cflags
, flags
))
4962 return rule
->action
== FILTER_ACTION_PERMIT
;