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l2tpns/l2tpns.h
Fernando Alves 76ae461853 Add a echo_timeout configuration option. 
Add a idle_echo_timeout configuration option.
2012-02-20 20:50:57 +01:00

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// L2TPNS Global Stuff
// $Id: l2tpns.h,v 1.121 2009-12-08 14:49:28 bodea Exp $
#ifndef __L2TPNS_H__
#define __L2TPNS_H__
#include <netinet/in.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <libcli.h>
#define VERSION "2.2.1"
// Limits
#define MAXTUNNEL 500 // could be up to 65535
#define MAXBUNDLE 300 // could be up to 65535
#define MAXBUNDLESES 12 // Maximum number of member links in bundle
#define MAXADDRESS 20 // Maximum length for the Endpoint Discrminiator address
#define MAXSESSION 60000 // could be up to 65535
#define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
#define RADIUS_SHIFT 6
#define RADIUS_FDS (1 << RADIUS_SHIFT)
#define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
#define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
#define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
#define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
#define MAXCONTROL 1000 // max length control message we ever send...
#define MINMTU 576 // minimum recommended MTU (rfc1063)
#define MAXMTU 2600 // arbitrary maximum MTU
#define PPPoE_MRU 1492 // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
#define MAXETHER (MAXMTU+18) // max packet we try sending to tun
#define MAXTEL 96 // telephone number
#define MAXHOSTNAME 256 // hostname
#define MAXUSER 128 // username
#define MAXPASS 128 // password
#define MAXCLASS 128 // radius class attribute size
#define MAXPLUGINS 20 // maximum number of plugins to load
#define MAXRADSERVER 10 // max radius servers
#define MAXROUTE 10 // max static routes per session
#define MAXIPPOOL 131072 // max number of ip addresses in pool
#define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
#define MAX_LOG_LENGTH 512 // Maximum size of log message
#define ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation
#define IDLE_ECHO_TIMEOUT 240 // Time between last packet seen and session shutdown
#define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
#define MP_BEGIN 0x80 // This value is used when (b)egin bit is set in MP header
#define MP_END 0x40 // This value is used when (e)nd bit is set in MP header
#define MP_BOTH_BITS 0xC0 // This value is used when both bits (begin and end) are set in MP header
#define MINFRAGLEN 64 // Minumum fragment length
#define MAXFRAGLEN 1496 // Maximum length for Multilink fragment (The multilink may contain only one link)
#define MAXFRAGNUM 512 // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
// it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
#define MAXFRAGNUM_MASK 511 // Must be equal to MAXFRAGNUM-1
// Constants
#ifndef ETCDIR
#define ETCDIR "/etc/l2tpns"
#endif
#ifndef LIBDIR
#define LIBDIR "/usr/lib/l2tpns"
#endif
#ifndef PLUGINDIR
#define PLUGINDIR LIBDIR // Plugins
#endif
#ifndef PLUGINCONF
#define PLUGINCONF ETCDIR // Plugin config dir
#endif
#ifndef FLASHDIR
#define FLASHDIR ETCDIR
#endif
#define TUNDEVICE "/dev/net/tun"
#define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
#define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
#define CLIUSERS FLASHDIR "/users" // CLI Users file
#define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
#define ACCT_TIME 3000 // 5 minute accounting interval
#define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
#define L2TPPORT 1701 // L2TP port
#define RADPORT 1645 // old radius port...
#define DAEPORT 3799 // DAE port
#define PKTARP 0x0806 // ARP packet type
#define PKTIP 0x0800 // IPv4 packet type
#define PKTIPV6 0x86DD // IPv6 packet type
#define PPPPAP 0xC023
#define PPPCHAP 0xC223
#define PPPLCP 0xC021
#define PPPIPCP 0x8021
#define PPPIPV6CP 0x8057
#define PPPCCP 0x80FD
#define PPPIP 0x0021
#define PPPIPV6 0x0057
#define PPPMP 0x003D
#define MIN_IP_SIZE 0x19
enum {
ConfigReq = 1,
ConfigAck,
ConfigNak,
ConfigRej,
TerminateReq,
TerminateAck,
CodeRej,
ProtocolRej,
EchoReq,
EchoReply,
DiscardRequest,
IdentRequest
};
enum {
AccessRequest = 1,
AccessAccept,
AccessReject,
AccountingRequest,
AccountingResponse,
AccessChallenge = 11,
DisconnectRequest = 40,
DisconnectACK,
DisconnectNAK,
CoARequest,
CoAACK,
CoANAK
};
// PPP phases
enum {
Dead,
Establish,
Authenticate,
Network,
Terminate
};
// PPP states
enum {
Initial,
Starting,
Closed,
Stopped,
Closing,
Stopping,
RequestSent,
AckReceived,
AckSent,
Opened
};
// reset state machine counters
#define initialise_restart_count(_s, _fsm) \
sess_local[_s]._fsm.conf_sent = \
sess_local[_s]._fsm.nak_sent = 0
// no more attempts
#define zero_restart_count(_s, _fsm) ({ \
sess_local[_s]._fsm.conf_sent = \
config->ppp_max_configure; \
sess_local[_s]._fsm.restart = \
time_now + config->ppp_restart_time; \
})
// increment ConfReq counter and reset timer
#define restart_timer(_s, _fsm) ({ \
sess_local[_s]._fsm.conf_sent++; \
sess_local[_s]._fsm.restart = \
time_now + config->ppp_restart_time; \
})
// stop timer on change to state where timer does not run
#define change_state(_s, _fsm, _new) ({ \
if (_new != session[_s].ppp._fsm) \
{ \
switch (_new) \
{ \
case Initial: \
case Starting: \
case Closed: \
case Stopped: \
case Opened: \
sess_local[_s]._fsm.restart = 0; \
initialise_restart_count(_s, _fsm); \
} \
session[_s].ppp._fsm = _new; \
cluster_send_session(_s); \
} \
})
// Types
typedef uint16_t sessionidt;
typedef uint16_t bundleidt;
typedef uint16_t tunnelidt;
typedef uint32_t clockt;
typedef uint8_t hasht[16];
// CLI actions
struct cli_session_actions {
char action;
in_addr_t snoop_ip;
uint16_t snoop_port;
int throttle_in;
int throttle_out;
int filter_in;
int filter_out;
};
#define CLI_SESS_KILL 0x01
#define CLI_SESS_SNOOP 0x02
#define CLI_SESS_NOSNOOP 0x04
#define CLI_SESS_THROTTLE 0x08
#define CLI_SESS_NOTHROTTLE 0x10
#define CLI_SESS_FILTER 0x20
#define CLI_SESS_NOFILTER 0x40
struct cli_tunnel_actions {
char action;
};
#define CLI_TUN_KILL 0x01
// structures
typedef struct // route
{
in_addr_t ip;
int prefixlen;
}
routet;
typedef struct controls // control message
{
struct controls *next; // next in queue
uint16_t length; // length
union {
uint8_t buf[MAXCONTROL];
uint16_t buf16[MAXCONTROL/2];
} __attribute__ ((__transparent_union__));
}
controlt;
typedef struct {
uint8_t length; // Endpoint Discriminator length
uint8_t addr_class; // Endpoint Discriminator class
uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
} epdist;
typedef struct {
sessionidt sid; // Fragment originating session
tunnelidt tid; // Fragment originating tunnel
uint8_t flags; // MP frame flags
uint32_t seq; // fragment seq num
uint32_t jitteravg;
uint16_t length; // Fragment length
uint8_t data[MAXFRAGLEN]; // Fragment data
} fragmentt;
typedef struct
{
sessionidt next; // next session in linked list
sessionidt far; // far end session ID
tunnelidt tunnel; // near end tunnel ID
uint8_t flags; // session flags: see SESSION_*
struct {
uint8_t phase; // PPP phase
uint8_t lcp:4; // LCP state
uint8_t ipcp:4; // IPCP state
uint8_t ipv6cp:4; // IPV6CP state
uint8_t ccp:4; // CCP state
} ppp;
uint16_t mru; // maximum receive unit
in_addr_t ip; // IP of session set by RADIUS response (host byte order).
int ip_pool_index; // index to IP pool
uint32_t unique_id; // unique session id
uint32_t magic; // ppp magic number
uint32_t pin, pout; // packet counts
uint32_t cin, cout; // byte counts
uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
uint16_t throttle_in; // upstream throttle rate (kbps)
uint16_t throttle_out; // downstream throttle rate
uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
uint8_t filter_out; // output filter index
uint16_t snoop_port; // Interception destination port
in_addr_t snoop_ip; // Interception destination IP
clockt opened; // when started
clockt die; // being closed, when to finally free
uint32_t session_timeout; // Maximum session time in seconds
uint32_t idle_timeout; // Maximum idle time in seconds
time_t last_packet; // Last packet from the user (used for idle timeouts)
time_t last_data; // Last data packet to/from the user (used for idle timeouts)
in_addr_t dns1, dns2; // DNS servers
routet route[MAXROUTE]; // static routes
uint16_t tbf_in; // filter bucket for throttling in from the user.
uint16_t tbf_out; // filter bucket for throttling out to the user.
int random_vector_length;
uint8_t random_vector[MAXTEL];
char user[MAXUSER]; // user (needed in session for radius stop messages)
char called[MAXTEL]; // called number
char calling[MAXTEL]; // calling number
uint32_t tx_connect_speed;
uint32_t rx_connect_speed;
clockt timeout; // Session timeout
uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
epdist epdis; // Multilink Endpoint Discriminator
bundleidt bundle; // Multilink Bundle Identifier
uint8_t mssf; // Multilink Short Sequence Number Header Format
uint8_t walled_garden; // is this session gardened?
uint8_t classlen; // class (needed for radius accounting messages)
char class[MAXCLASS];
uint8_t ipv6prefixlen; // IPv6 route prefix length
struct in6_addr ipv6route; // Static IPv6 route
char reserved[12]; // Space to expand structure without changing HB_VERSION
}
sessiont;
typedef struct
{
int state; // current state (bundlestate enum)
uint32_t seq_num_t; // Sequence Number (transmission)
uint32_t timeout; // Session-Timeout for bundle
uint32_t max_seq; // Max value of sequence number field
uint8_t num_of_links; // Number of links joint to this bundle
uint32_t online_time; // The time this bundle is online
clockt last_check; // Last time the timeout is checked
uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
uint8_t mssf; // Multilink Short Sequence Number Header Format
epdist epdis; // Multilink Endpoint Discriminator
char user[MAXUSER]; // Needed for matching member links
sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
sessionidt members[MAXBUNDLESES]; // Array for member links sessions
}
bundlet;
typedef struct
{
fragmentt fragment[MAXFRAGNUM];
uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
uint16_t re_frame_len; // The reassembled frame length
uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively
uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively
uint32_t M; // Minumum frame sequence number received over all bundle members
uint32_t start_seq; // Last received frame sequence number (bearing B bit)
}
fragmentationt;
#define AUTHPAP 1 // allow PAP
#define AUTHCHAP 2 // allow CHAP
typedef struct
{
// packet counters
uint32_t pin;
uint32_t pout;
// byte counters
uint32_t cin;
uint32_t cout;
// PPP restart timer/counters
struct {
time_t restart;
int conf_sent;
int nak_sent;
} lcp, ipcp, ipv6cp, ccp;
// identifier for Protocol-Reject, Code-Reject
uint8_t lcp_ident;
// authentication to use
int lcp_authtype;
// our MRU
uint16_t ppp_mru;
// our MRRU
uint16_t mp_mrru;
// our mssf
uint16_t mp_mssf;
// our Endpoint Discriminator
in_addr_t mp_epdis;
// DoS prevention
clockt last_packet_out;
uint32_t packets_out;
uint32_t packets_dropped;
// RADIUS session in use
uint16_t radius;
// interim RADIUS
time_t last_interim;
// last LCP Echo
time_t last_echo;
// Last Multilink frame sequence number received
uint32_t last_seq;
// jitter average of the session
uint32_t jitteravg;
// time in milliseconds of the last fragment.
uint64_t prev_time;
} sessionlocalt;
// session flags
#define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
#define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
#define SESSION_STARTED (1 << 2) // RADIUS Start record sent
// 168 bytes per tunnel
typedef struct
{
tunnelidt far; // far end tunnel ID
in_addr_t ip; // Ip for far end
uint16_t port; // port for far end
uint16_t window; // Rx window
uint16_t nr; // next receive
uint16_t ns; // next send
int state; // current state (tunnelstate enum)
clockt last; // when last control message sent (used for resend timeout)
clockt retry; // when to try resending pending control
clockt die; // being closed, when to finally free
clockt lastrec; // when the last control message was received
char hostname[128]; // tunnel hostname
char vendor[128]; // LAC vendor
uint8_t try; // number of retrys on a control message
uint16_t controlc; // outstaind messages in queue
controlt *controls; // oldest message
controlt *controle; // newest message
}
tunnelt;
// 164 bytes per radius session
typedef struct // outstanding RADIUS requests
{
sessionidt session; // which session this applies to
hasht auth; // request authenticator
clockt retry; // when to try next
char pass[129]; // password
uint8_t id; // ID for PPP response
uint8_t try; // which try we are on
uint8_t state; // state of radius requests
uint8_t chap; // set if CHAP used (is CHAP identifier)
uint8_t term_cause; // Stop record: Acct-Terminate-Cause
char const *term_msg; // terminate reason
}
radiust;
typedef struct
{
in_addr_t address; // Host byte order..
char assigned; // 1 if assigned, 0 if free
sessionidt session;
clockt last; // last used
char user[129]; // user (try to have ip addresses persistent)
}
ippoolt;
#ifdef RINGBUFFER
struct Tringbuffer
{
struct {
char level;
sessionidt session;
tunnelidt tunnel;
char message[MAX_LOG_LENGTH];
} buffer[RINGBUFFER_SIZE];
int head;
int tail;
};
#endif
/*
* Possible tunnel states
* TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
*/
enum
{
TUNNELFREE, // Not in use
TUNNELOPEN, // Active tunnel
TUNNELDIE, // Currently closing
TUNNELOPENING, // Busy opening
TUNNELUNDEF, // Undefined
};
enum
{
BUNDLEFREE, // Not in use
BUNDLEOPEN, // Active bundle
BUNDLEUNDEF, // Undefined
};
enum
{
NULLCLASS = 0, //End Point Discriminator classes
LOCALADDR,
IPADDR,
IEEEMACADDR,
PPPMAGIC,
PSNDN,
};
enum
{
RADIUSNULL, // Not in use
RADIUSCHAP, // sending CHAP down PPP
RADIUSAUTH, // sending auth to RADIUS server
RADIUSSTART, // sending start accounting to RADIUS server
RADIUSSTOP, // sending stop accounting to RADIUS server
RADIUSINTERIM, // sending interim accounting to RADIUS server
RADIUSWAIT, // waiting timeout before available, in case delayed replies
RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning
};
struct Tstats
{
time_t start_time;
time_t last_reset;
uint32_t tun_rx_packets;
uint32_t tun_tx_packets;
uint32_t tun_rx_bytes;
uint32_t tun_tx_bytes;
uint32_t tun_rx_errors;
uint32_t tun_tx_errors;
uint32_t tun_rx_dropped;
uint32_t tunnel_rx_packets;
uint32_t tunnel_tx_packets;
uint32_t tunnel_rx_bytes;
uint32_t tunnel_tx_bytes;
uint32_t tunnel_rx_errors;
uint32_t tunnel_tx_errors;
uint32_t tunnel_retries;
uint32_t radius_retries;
uint32_t arp_sent;
uint32_t packets_snooped;
uint32_t tunnel_created;
uint32_t session_created;
uint32_t tunnel_timeout;
uint32_t session_timeout;
uint32_t radius_timeout;
uint32_t radius_overflow;
uint32_t tunnel_overflow;
uint32_t session_overflow;
uint32_t ip_allocated;
uint32_t ip_freed;
uint32_t c_forwarded;
uint32_t recv_forward;
uint32_t select_called;
uint32_t multi_read_used;
uint32_t multi_read_exceeded;
#ifdef STATISTICS
uint32_t call_processtun;
uint32_t call_processipout;
uint32_t call_processipv6out;
uint32_t call_processudp;
uint32_t call_sessionbyip;
uint32_t call_sessionbyipv6;
uint32_t call_sessionbyuser;
uint32_t call_sendarp;
uint32_t call_sendipcp;
uint32_t call_sendipv6cp;
uint32_t call_processipv6cp;
uint32_t call_tunnelsend;
uint32_t call_sessionkill;
uint32_t call_sessionshutdown;
uint32_t call_tunnelkill;
uint32_t call_tunnelshutdown;
uint32_t call_assign_ip_address;
uint32_t call_free_ip_address;
uint32_t call_dump_acct_info;
uint32_t call_sessionsetup;
uint32_t call_processpap;
uint32_t call_processchap;
uint32_t call_processlcp;
uint32_t call_processipcp;
uint32_t call_processipin;
uint32_t call_processipv6in;
uint32_t call_processccp;
uint32_t call_sendchap;
uint32_t call_processrad;
uint32_t call_radiussend;
uint32_t call_radiusretry;
uint32_t call_random_data;
#endif
};
#ifdef STATISTICS
#ifdef STAT_CALLS
#define CSTAT(x) STAT(call_ ## x)
#else
#define CSTAT(x)
#endif
#define STAT(x) (_statistics->x++)
#define INC_STAT(x,y) (_statistics->x += (y))
#define GET_STAT(x) (_statistics->x)
#define SET_STAT(x, y) (_statistics->x = (y))
#else
#define CSTAT(x)
#define STAT(x)
#define INC_STAT(x,y)
#define GET_STAT(x) 0
#define SET_STAT(x, y)
#endif
#ifndef IFNAMSIZ
# define IFNAMSIZ 16
#endif
typedef struct
{
int debug; // debugging level
time_t start_time; // time when l2tpns was started
char bandwidth[256]; // current bandwidth
char pid_file[256]; // file to write PID to on startup
int wrote_pid;
clockt current_time; // 1/10ths of a second since the process started.
// means that we can only run a given process
// for 13 years without re-starting!
char config_file[128];
int reload_config; // flag to re-read config (set by cli)
int multi_read_count; // amount of packets to read per fd in processing loop
char tundevice[IFNAMSIZ]; // tun device name
char log_filename[128];
char l2tp_secret[64]; // L2TP shared secret
int l2tp_mtu; // MTU of interface used for L2TP
char random_device[256]; // random device path, defaults to RANDOMDEVICE
int ppp_restart_time; // timeout for PPP restart
int ppp_max_configure; // max lcp configure requests to send
int ppp_max_failure; // max lcp configure naks to send
char radiussecret[64];
int radius_accounting;
int radius_interim;
in_addr_t radiusserver[MAXRADSERVER]; // radius servers
uint16_t radiusport[MAXRADSERVER]; // radius base ports
uint8_t numradiusservers; // radius server count
uint16_t radius_dae_port; // port for radius DAE
uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets
uint16_t radius_bind_max;
char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
int radius_authtypes;
int radius_authprefer;
int allow_duplicate_users; // allow multiple logins with the same username
int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0"
in_addr_t default_dns1, default_dns2;
unsigned long rl_rate; // default throttle rate
int num_tbfs; // number of throttle buckets
char accounting_dir[128];
in_addr_t bind_address;
in_addr_t peer_address;
int send_garp; // Set to true to garp for vip address on startup
int dump_speed;
char plugins[64][MAXPLUGINS];
char old_plugins[64][MAXPLUGINS];
int next_tbf; // Next HTB id available to use
int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
// policy for this process.
int lock_pages; // Lock pages into memory.
int icmp_rate; // Max number of ICMP unreachable per second to send
int max_packets; // DoS prevention: per session limit of packets/0.1s
char epdis_addr[20]; // MP Endpoint Discriminator address
in_addr_t cluster_address; // Multicast address of cluster.
// Send to this address to have everyone hear.
char cluster_interface[64]; // Which interface to listen for multicast on.
int cluster_iam_master; // Are we the cluster master???
int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
in_addr_t cluster_master_address; // The network address of the cluster master.
// Zero if i am the cluster master.
int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
// (or the seq number we're next expecting if we're a slave).
int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
int cluster_highest_sessionid;
int cluster_highest_bundleid;
int cluster_highest_tunnelid;
clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
int cluster_last_hb_ver; // Heartbeat version last seen from master
int cluster_num_changes; // Number of changes queued.
int cluster_mcast_ttl; // TTL for multicast packets
int cluster_hb_interval; // How often to send a heartbeat.
int cluster_hb_timeout; // How many missed heartbeats trigger an election.
uint64_t cluster_table_version; // # state changes processed by cluster
struct in6_addr ipv6_prefix; // Our IPv6 network pool.
int cluster_master_min_adv; // Master advertises routes while the number of up to date
// slaves is less than this value.
in_addr_t cli_bind_address; // bind address for CLI
char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
// Guest change
char guest_user[MAXUSER]; // Guest account username
#ifdef BGP
#define BGP_NUM_PEERS 2
uint16_t as_number;
struct {
char name[64];
uint16_t as;
int keepalive;
int hold;
struct in_addr update_source;
} neighbour[BGP_NUM_PEERS];
in_addr_t nexthop_address;
struct in6_addr nexthop6_address;
#endif
int echo_timeout; // Time between last packet sent and LCP ECHO generation
int idle_echo_timeout; // Time between last packet seen and
// Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
} configt;
enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
typedef struct
{
char *key;
int offset;
int size;
enum config_typet type;
} config_descriptt;
typedef struct
{
uint8_t op; // operation
#define FILTER_PORT_OP_NONE 0 // all ports match
#define FILTER_PORT_OP_EQ 1
#define FILTER_PORT_OP_NEQ 2
#define FILTER_PORT_OP_GT 3
#define FILTER_PORT_OP_LT 4
#define FILTER_PORT_OP_RANGE 5
uint16_t port; // port (host byte order)
uint16_t port2; // range
} ip_filter_portt;
typedef struct
{
int action; // permit/deny
#define FILTER_ACTION_DENY 1
#define FILTER_ACTION_PERMIT 2
uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
in_addr_t src_ip; // source ip (network byte order)
in_addr_t src_wild;
ip_filter_portt src_ports;
in_addr_t dst_ip; // dest ip
in_addr_t dst_wild;
ip_filter_portt dst_ports;
uint8_t frag; // apply to non-initial fragments
uint8_t tcp_flag_op; // match type: any, all, established
#define FILTER_FLAG_OP_ANY 1
#define FILTER_FLAG_OP_ALL 2
#define FILTER_FLAG_OP_EST 3
uint8_t tcp_sflags; // flags set
uint8_t tcp_cflags; // flags clear
uint32_t counter; // match count
} ip_filter_rulet;
#define TCP_FLAG_FIN 0x01
#define TCP_FLAG_SYN 0x02
#define TCP_FLAG_RST 0x04
#define TCP_FLAG_PSH 0x08
#define TCP_FLAG_ACK 0x10
#define TCP_FLAG_URG 0x20
#define MAXFILTER 32
#define MAXFILTER_RULES 32
typedef struct
{
char name[32]; // ACL name
int extended; // type: 0 = standard, 1 = extended
ip_filter_rulet rules[MAXFILTER_RULES];
int used; // session ref count
} ip_filtert;
// CDN result/error codes
#define CDN_NONE 0, 0
#define CDN_TRY_ANOTHER 2, 7
#define CDN_ADMIN_DISC 3, 0
#define CDN_UNAVAILABLE 4, 0
// RADIUS Acct-Terminate-Cause values
#define TERM_USER_REQUEST 1
#define TERM_LOST_CARRIER 2
#define TERM_LOST_SERVICE 3
#define TERM_IDLE_TIMEOUT 4
#define TERM_SESSION_TIMEOUT 5
#define TERM_ADMIN_RESET 6
#define TERM_ADMIN_REBOOT 7
#define TERM_PORT_ERROR 8
#define TERM_NAS_ERROR 9
#define TERM_NAS_REQUEST 10
#define TERM_NAS_REBOOT 11
#define TERM_PORT_UNNEEDED 12
#define TERM_PORT_PREEMPTED 13
#define TERM_PORT_SUSPENDED 14
#define TERM_SERVICE_UNAVAILABLE 15
#define TERM_CALLBACK 16
#define TERM_USER_ERROR 17
#define TERM_HOST_REQUEST 18
#define TERM_SUPPLICANT_RESTART 19
#define TERM_REAUTHENTICATION_FAILURE 20
#define TERM_PORT_REINIT 21
#define TERM_PORT_DISABLED 22
// arp.c
void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
// ppp.c
void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void lcp_open(sessionidt s, tunnelidt t);
void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
void sendchap(sessionidt s, tunnelidt t);
uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits);
void sendlcp(sessionidt s, tunnelidt t);
void send_ipin(sessionidt s, uint8_t *buf, int len);
void sendccp(sessionidt s, tunnelidt t);
void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
int join_bundle(sessionidt s);
// radius.c
void initrad(void);
void radiussend(uint16_t r, uint8_t state);
void processrad(uint8_t *buf, int len, char socket_index);
void radiusretry(uint16_t r);
uint16_t radiusnew(sessionidt s);
void radiusclear(uint16_t r, sessionidt s);
void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
// l2tpns.c
clockt backoff(uint8_t try);
void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
sessionidt sessionbyip(in_addr_t ip);
sessionidt sessionbyipv6(struct in6_addr ip);
sessionidt sessionbyuser(char *username);
void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
void random_data(uint8_t *buf, int len);
void sessionkill(sessionidt s, char *reason);
void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
void filter_session(sessionidt s, int filter_in, int filter_out);
void send_garp(in_addr_t ip);
void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
int tun_write(uint8_t *data, int size);
void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
void sendipcp(sessionidt s, tunnelidt t);
void sendipv6cp(sessionidt s, tunnelidt t);
void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
int find_filter(char const *name, size_t len);
int ip_filter(uint8_t *buf, int len, uint8_t filter);
int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
#undef LOG
#undef LOG_HEX
#define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
#define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
int sessionsetup(sessionidt s, tunnelidt t);
int run_plugins(int plugin_type, void *data);
void rebuild_address_pool(void);
void throttle_session(sessionidt s, int rate_in, int rate_out);
int load_session(sessionidt, sessiont *);
void become_master(void); // We're the master; kick off any required master initializations.
// cli.c
void init_cli();
void cli_init_complete(char *hostname);
void cli_do_file(FILE *fh);
void cli_do(int sockfd);
int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
// icmp.c
void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
extern tunnelt *tunnel;
extern bundlet *bundle;
extern sessiont *session;
extern sessionlocalt *sess_local;
extern ippoolt *ip_address_pool;
#define sessionfree (session[0].next)
extern configt *config;
extern time_t basetime; // Time when this process started.
extern time_t time_now; // Seconds since EPOCH.
extern char main_quit;
extern uint32_t last_id;
extern struct Tstats *_statistics;
extern in_addr_t my_address;
extern int clifd;
extern int epollfd;
struct event_data {
enum {
FD_TYPE_CLI,
FD_TYPE_CLUSTER,
FD_TYPE_TUN,
FD_TYPE_UDP,
FD_TYPE_CONTROL,
FD_TYPE_DAE,
FD_TYPE_RADIUS,
FD_TYPE_BGP,
FD_TYPE_NETLINK,
} type;
int index; // for RADIUS, BGP
};
#define TIME (config->current_time)
extern uint16_t MRU;
extern uint16_t MSS;
// macros for handling help in cli commands
#define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
#define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
#endif /* __L2TPNS_H__ */
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