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l2tpns/l2tpns.h

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// L2TPNS Global Stuff
// $Id: l2tpns.h,v 1.13 2004/07/26 00:20:41 fred_nerk Exp $
#ifndef __L2TPNS_H__
#define __L2TPNS_H__
#include <netinet/in.h>
#include <execinfo.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 "2.0.1"
// Limits
#define MAXTUNNEL 500 // could be up to 65535
#define MAXSESSION 50000 // could be up to 65535
#define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
#define RADIUS_SHIFT 5
#define RADIUS_MASK ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
#define MAXRADIUS ((2 << (RADIUS_SHIFT - 1)) * 255)
#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 MAXETHER (1500+18) // max packet we try sending to tun
#define MAXTEL 96 // telephone number
#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 60 // Time between last packet sent and LCP ECHO generation
#define IDLE_TIMEOUT 240 // Time between last packet sent and LCP ECHO generation
// Constants
#include "config.h"
#ifndef PLUGINDIR
#define PLUGINDIR LIBDIR // Plugins
#endif
#ifndef PLUGINCONF
#define PLUGINCONF ETCDIR // Plugin config dir
#endif
#ifndef DATADIR
#define DATADIR "/tmp"
#endif
#ifndef FLASHDIR
#define FLASHDIR ETCDIR
#endif
#define TUNDEVICE "/dev/net/tun"
#define STATEFILE DATADIR "/state.dump" // State dump file
#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 L2TPPORT 1701 // L2TP port
#define RADPORT 1645 // old radius port...
#define PKTARP 0x0806 // ARP packet type
#define PKTIP 0x0800 // IP packet type
#define PSEUDOMAC 0x0200 // pseudo MAC prefix (local significant MAC)
#define PPPPAP 0xC023
#define PPPCHAP 0xC223
#define PPPLCP 0xC021
#define PPPIPCP 0x8021
#define PPPCCP 0x80FD
#define PPPIP 0x0021
#define PPPMP 0x003D
#define MIN_IP_SIZE 0x19
enum
{
ConfigReq = 1,
ConfigAck,
ConfigNak,
ConfigRej,
TerminateReq,
TerminateAck,
CodeRej,
ProtocolRej,
EchoReq,
EchoReply,
DiscardRequest
};
// Types
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned char u8;
typedef u32 ipt;
typedef u16 portt;
typedef u16 sessionidt;
typedef u16 tunnelidt;
typedef u32 clockt;
typedef u8 hasht[16];
// CLI actions
struct cli_session_actions {
char action;
ipt snoop_ip;
u16 snoop_port;
int throttle;
};
#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
struct cli_tunnel_actions {
char action;
};
#define CLI_TUN_KILL 0x01
// dump header: update number if internal format changes
#define DUMP_MAGIC "L2TPNS#" VERSION "#"
// structures
typedef struct routes // route
{
ipt ip;
ipt mask;
}
routet;
typedef struct controls // control message
{
struct controls *next; // next in queue
u16 length; // length
u8 buf[MAXCONTROL];
}
controlt;
typedef struct sessions
{
sessionidt next; // next session in linked list
sessionidt far; // far end session ID
tunnelidt tunnel; // tunnel ID
ipt ip; // IP of session set by RADIUS response (host byte order).
int ip_pool_index; // index to IP pool
unsigned long sid; // session id for hsddb
u16 nr; // next receive
u16 ns; // next send
u32 magic; // ppp magic number
u32 cin, cout; // byte counts
u32 pin, pout; // packet counts
u32 total_cin; // This counter is never reset while a session is open
u32 total_cout; // This counter is never reset while a session is open
u32 id; // session id
u32 throttle; // non-zero if this session is throttled.
clockt opened; // when started
clockt die; // being closed, when to finally free
time_t last_packet; // Last packet from the user (used for idle timeouts)
ipt dns1, dns2; // DNS servers
routet route[MAXROUTE]; // static routes
u16 radius; // which radius session is being used (0 for not waiting on authentication)
u16 mru; // maximum receive unit
u16 tbf_in; // filter bucket for throttling in from the user.
u16 tbf_out; // filter bucket for throttling out to the user.
u8 l2tp_flags; // various bit flags from the ICCN on the l2tp tunnel.
u8 walled_garden; // is this session gardened?
u8 flags1; // additional flags (currently unused);
char random_vector[MAXTEL];
int random_vector_length;
char user[129]; // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
char called[MAXTEL]; // called number
char calling[MAXTEL]; // calling number
u32 tx_connect_speed;
u32 rx_connect_speed;
u32 flags; // Various session flags.
ipt snoop_ip; // Interception destination IP
u16 snoop_port; // Interception destination port
char reserved[28]; // Space to expand structure without changing HB_VERSION
}
sessiont;
#define SF_IPCP_ACKED (1<<0) // Has this session seen an IPCP Ack?
typedef struct {
u32 cin;
u32 cout;
} sessioncountt;
#define SESSIONPFC 1 // PFC negotiated flags
#define SESSIONACFC 2 // ACFC negotiated flags
// 168 bytes per tunnel
typedef struct tunnels
{
tunnelidt far; // far end tunnel ID
ipt ip; // Ip for far end
portt port; // port for far end
u16 window; // Rx window
u16 nr; // next receive
u16 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 resenting 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
u8 try; // number of retrys on a control message
u16 controlc; // outstaind messages in queue
controlt *controls; // oldest message
controlt *controle; // newest message
}
tunnelt;
// 180 bytes per radius session
typedef struct radiuss // outstanding RADIUS requests
{
sessionidt session; // which session this applies to
hasht auth; // request authenticator
clockt retry; // when to try next
char calling[MAXTEL]; // calling number
char pass[129]; // password
u8 id; // ID for PPP response
u8 try; // which try we are on
u8 state; // state of radius requests
u8 chap; // set if CHAP used (is CHAP identifier)
}
radiust;
typedef struct
{
ipt 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;
ipt address;
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
{
RADIUSNULL, // Not in use
RADIUSCHAP, // sending CHAP down PPP
RADIUSAUTH, // sending auth to RADIUS server
RADIUSIPCP, // sending IPCP to end user
RADIUSSTART, // sending start accounting to RADIUS server
RADIUSSTOP, // sending stop accounting to RADIUS server
RADIUSWAIT, // waiting timeout before available, in case delayed replies
RADIUSDEAD, // errored while talking to radius server.
};
struct Tstats
{
time_t start_time;
time_t last_reset;
unsigned long tun_rx_packets;
unsigned long tun_tx_packets;
unsigned long tun_rx_bytes;
unsigned long tun_tx_bytes;
unsigned long tun_rx_errors;
unsigned long tun_tx_errors;
unsigned long tunnel_rx_packets;
unsigned long tunnel_tx_packets;
unsigned long tunnel_rx_bytes;
unsigned long tunnel_tx_bytes;
unsigned long tunnel_rx_errors;
unsigned long tunnel_tx_errors;
unsigned long tunnel_retries;
unsigned long radius_retries;
unsigned long arp_sent;
unsigned long packets_snooped;
unsigned long tunnel_created;
unsigned long session_created;
unsigned long tunnel_timeout;
unsigned long session_timeout;
unsigned long radius_timeout;
unsigned long radius_overflow;
unsigned long tunnel_overflow;
unsigned long session_overflow;
unsigned long ip_allocated;
unsigned long ip_freed;
unsigned long c_forwarded;
unsigned long recv_forward;
#ifdef STATISTICS
unsigned long call_processtun;
unsigned long call_processipout;
unsigned long call_processudp;
unsigned long call_sessionbyip;
unsigned long call_sessionbyuser;
unsigned long call_sendarp;
unsigned long call_sendipcp;
unsigned long call_tunnelsend;
unsigned long call_sessionkill;
unsigned long call_sessionshutdown;
unsigned long call_tunnelkill;
unsigned long call_tunnelshutdown;
unsigned long call_assign_ip_address;
unsigned long call_free_ip_address;
unsigned long call_dump_acct_info;
unsigned long call_sessionsetup;
unsigned long call_processpap;
unsigned long call_processchap;
unsigned long call_processlcp;
unsigned long call_processipcp;
unsigned long call_processipin;
unsigned long call_processccp;
unsigned long call_sendchap;
unsigned long call_processrad;
unsigned long call_radiussend;
unsigned long call_radiusretry;
#endif
};
#ifdef STATISTICS
#ifdef STAT_CALLS
#define CSTAT(x) STAT(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
struct configt
{
int debug; // debugging level
time_t start_time; // time when l2tpns was started
char bandwidth[256]; // current bandwidth
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 cleanup_interval; // interval between regular cleanups (in seconds)
int multi_read_count; // amount of packets to read per fd in processing loop
char tundevice[10]; // tun device name
char log_filename[128];
char l2tpsecret[64];
char radiussecret[64];
int radius_accounting;
ipt radiusserver[MAXRADSERVER]; // radius servers
u16 radiusport[MAXRADSERVER]; // radius base ports
u8 numradiusservers; // radius server count
short num_radfds; // Number of radius filehandles allocated
ipt default_dns1, default_dns2;
unsigned long rl_rate;
int save_state;
char accounting_dir[128];
ipt bind_address;
int send_garp; // Set to true to garp for vip address on startup
int target_uid;
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>
u32 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.
u32 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_tunnels; // How many tunnels we're yet to receive from the master.
int cluster_highest_sessionid;
int cluster_highest_tunnelid;
clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
int cluster_num_changes; // Number of changes queued.
int cluster_hb_interval; // How often to send a heartbeat.
int cluster_hb_timeout; // How many missed heartbeats trigger an election.
#ifdef BGP
u16 as_number;
char bgp_peer[2][64];
u16 bgp_peer_as[2];
#endif
};
struct config_descriptt
{
char *key;
int offset;
int size;
enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP } type;
};
// arp.c
void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
// ppp.c
void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l);
void processchap(tunnelidt t, sessionidt s, u8 * p, u16 l);
void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l);
void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l);
void sendchap(tunnelidt t, sessionidt s);
u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);
u8 *findppp(u8 * b, u8 mtype);
void initlcp(tunnelidt t, sessionidt s);
void dumplcp(u8 *p, int l);
// radius.c
void initrad(void);
void radiussend(u16 r, u8 state);
void processrad(u8 *buf, int len, char socket_index);
void radiusretry(u16 r);
u16 radiusnew(sessionidt s);
void radiusclear(u16 r, sessionidt s);
// throttle.c
int throttle_session(sessionidt s, int throttle);
// rl.c
void init_rl();
u16 rl_create_tbf();
u16 rl_get_tbf();
void rl_done_tbf(u16 t);
void rl_destroy_tbf(u16 t);
// l2tpns.c
clockt now(void);
clockt backoff(u8 try);
void routeset(sessionidt, ipt ip, ipt mask, ipt gw, u8 add);
void inittun(void);
void initudp(void);
void initdata(void);
void initippool();
sessionidt sessionbyip(ipt ip);
sessionidt sessionbyuser(char *username);
void sessionshutdown(sessionidt s, char *reason);
void sessionsendarp(sessionidt s);
void send_garp(ipt ip);
void sessionkill(sessionidt s, char *reason);
void control16(controlt * c, u16 avp, u16 val, u8 m);
void control32(controlt * c, u16 avp, u32 val, u8 m);
void controls(controlt * c, u16 avp, char *val, u8 m);
void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m);
controlt *controlnew(u16 mtype);
void controlnull(tunnelidt t);
void controladd(controlt * c, tunnelidt t, sessionidt s);
void tunnelsend(u8 * buf, u16 l, tunnelidt t);
void tunnelkill(tunnelidt t, char *reason);
void tunnelshutdown(tunnelidt t, char *reason);
void sendipcp(tunnelidt t, sessionidt s);
void processipout(u8 * buf, int len);
void processarp(u8 * buf, int len);
void processudp(u8 * buf, int len, struct sockaddr_in *addr);
void processtun(u8 * buf, int len);
void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
int assign_ip_address(sessionidt s);
void free_ip_address(sessionidt s);
void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port);
void dump_acct_info();
void mainloop(void);
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);
#define log _log
#ifndef log_hex
#define log_hex(a,b,c,d) do{if (a <= config->debug) _log_hex(a,0,0,0,b,c,d);}while (0)
#endif
void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 5, 6)));
void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize);
void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
int sessionsetup(tunnelidt t, sessionidt s);
int cluster_send_session(int s);
int cluster_send_tunnel(int t);
int cluster_send_goodbye();
void init_cli(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, ...);
#ifdef RINGBUFFER
void ringbuffer_dump(FILE *stream);
#endif
void initplugins(void);
int run_plugins(int plugin_type, void *data);
void add_plugin(char *plugin_name);
void remove_plugin(char *plugin_name);
void plugins_done(void);
void tunnelclear(tunnelidt t);
void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
void fix_address_pool(int sid);
void rebuild_address_pool(void);
void send_ipin(sessionidt s, u8 * buf, int len);
int throttle_session(sessionidt s, int throttle);
int load_session(sessionidt, sessiont *);
void become_master(void); // We're the master; kick off any required master initializations.
extern tunnelt *tunnel;
extern sessiont *session;
extern sessioncountt *sess_count;
extern ippoolt *ip_address_pool;
#define sessionfree (session[0].next)
#define log_backtrace(count, max) \
if (count++ < max) { \
void *array[20]; \
char **strings; \
int size, i; \
log(0, 0, 0, t, "Backtrace follows"); \
size = backtrace(array, 10); \
strings = backtrace_symbols(array, size); \
if (strings) for (i = 0; i < size; i++) \
{ \
log(0, 0, 0, t, "%s\n", strings[i]); \
} \
free(strings); \
}
extern struct configt *config;
extern time_t basetime; // Time when this process started.
extern time_t time_now; // Seconds since EPOCH.
extern u32 last_sid;
extern struct Tstats *_statistics;
extern ipt my_address;
extern int tun_write(u8 *data, int size);
#define TIME (config->current_time)
// 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)
// CVS identifiers (for "show version file")
extern char const *cvs_id_arp;
extern char const *cvs_id_cli;
extern char const *cvs_id_cluster;
extern char const *cvs_id_constants;
extern char const *cvs_id_control;
extern char const *cvs_id_icmp;
extern char const *cvs_id_l2tpns;
extern char const *cvs_id_ll;
extern char const *cvs_id_md5;
extern char const *cvs_id_ppp;
extern char const *cvs_id_radius;
extern char const *cvs_id_tbf;
extern char const *cvs_id_util;
#endif /* __L2TPNS_H__ */
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