// L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.10 2004/07/07 09:09:53 bodea Exp $
+// $Id: l2tpns.h,v 1.45 2004/12/03 06:40:02 bodea Exp $
#ifndef __L2TPNS_H__
#define __L2TPNS_H__
#include <sys/types.h>
#include <libcli.h>
-#define VERSION "2.0.0"
+#define VERSION "2.0.13"
// Limits
#define MAXTUNNEL 500 // could be up to 65535
#define RADIUS_SHIFT 5
#define RADIUS_MASK ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
-#define MAXRADIUS ((2 << (RADIUS_SHIFT - 1)) * 255)
+#define MAXRADIUS ((unsigned long)(1L << RADIUS_SHIFT) * 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 tap
+#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 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
+#define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
// Constants
-#include "config.h"
-#ifndef PLUGINDIR
-#define PLUGINDIR LIBDIR // Plugins
+#ifndef ETCDIR
+#define ETCDIR "/etc/l2tpns"
#endif
-#ifndef PLUGINCONF
-#define PLUGINCONF ETCDIR // Plugin config dir
+#ifndef LIBDIR
+#define LIBDIR "/usr/lib/l2tpns"
#endif
-#ifndef DATADIR
-#define DATADIR "/tmp"
+#ifndef STATEDIR
+#define STATEDIR "/var/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 TAPDEVICE "/dev/net/tun"
+#ifndef DATADIR
+#define DATADIR STATEDIR
+#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 ACCT_TIME 3000 // 5 minute accounting interval
#define L2TPPORT 1701 // L2TP port
#define RADPORT 1645 // old radius port...
-#define RADAPORT 1646 // old radius accounting port
#define PKTARP 0x0806 // ARP packet type
#define PKTIP 0x0800 // IP packet type
#define PSEUDOMAC 0x0200 // pseudo MAC prefix (local significant MAC)
ProtocolRej,
EchoReq,
EchoReply,
- DiscardRequest
+ DiscardRequest,
+ IdentRequest
};
// Types
typedef unsigned short u16;
typedef unsigned int u32;
+typedef unsigned long long u64;
typedef unsigned char u8;
typedef u32 ipt;
typedef u16 portt;
typedef u32 clockt;
typedef u8 hasht[16];
+// CLI actions
+struct cli_session_actions {
+ char action;
+ ipt snoop_ip;
+ u16 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
+
// dump header: update number if internal format changes
#define DUMP_MAGIC "L2TPNS#" VERSION "#"
// structures
-typedef struct routes // route
+typedef struct // route
{
ipt ip;
ipt mask;
}
controlt;
-typedef struct sessions
+typedef struct
{
sessionidt next; // next session in linked list
sessionidt far; // far end session ID
- tunnelidt tunnel; // tunnel ID
+ tunnelidt tunnel; // near end 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
+ unsigned long unique_id; // unique session id
u16 nr; // next receive
u16 ns; // next send
u32 magic; // ppp magic number
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.
+ u16 throttle_in; // upstream throttle rate (kbps)
+ u16 throttle_out; // downstream throttle rate
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)
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 reserved_old_snoop; // No longer used - remove at some time
u8 walled_garden; // is this session gardened?
u8 flags1; // additional flags (currently unused);
char random_vector[MAXTEL];
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
+ u16 sid; // near end session id.
+ u8 filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
+ u8 filter_out; // output filter index
+ char reserved[18]; // Space to expand structure without changing HB_VERSION
}
sessiont;
-#define SF_IPCP_ACKED (1<<0) // Has this session seen an IPCP Ack?
+#define SF_IPCP_ACKED 1 // Has this session seen an IPCP Ack?
+#define SF_LCP_ACKED 2 // LCP negotiated
+#define SF_CCP_ACKED 4 // CCP negotiated
-typedef struct {
+typedef struct
+{
u32 cin;
u32 cout;
} sessioncountt;
-#define SESSIONPFC 1 // PFC negotiated flags
-#define SESSIONACFC 2 // ACFC negotiated flags
+#define SESSIONPFC 1 // PFC negotiated flags
+#define SESSIONACFC 2 // ACFC negotiated flags
// 168 bytes per tunnel
-typedef struct tunnels
+typedef struct
{
tunnelidt far; // far end tunnel ID
ipt ip; // Ip for far end
tunnelt;
// 180 bytes per radius session
-typedef struct radiuss // outstanding RADIUS requests
+typedef struct // outstanding RADIUS requests
{
sessionidt session; // which session this applies to
hasht auth; // request authenticator
char level;
sessionidt session;
tunnelidt tunnel;
- ipt address;
char message[MAX_LOG_LENGTH];
} buffer[RINGBUFFER_SIZE];
int head;
time_t start_time;
time_t last_reset;
- unsigned long tap_rx_packets;
- unsigned long tap_tx_packets;
- unsigned long tap_rx_bytes;
- unsigned long tap_tx_bytes;
- unsigned long tap_rx_errors;
- unsigned long tap_tx_errors;
+ 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_retries;
unsigned long radius_retries;
- unsigned long arp_errors;
- unsigned long arp_replies;
- unsigned long arp_discarded;
unsigned long arp_sent;
- unsigned long arp_recv;
unsigned long packets_snooped;
unsigned long c_forwarded;
unsigned long recv_forward;
#ifdef STATISTICS
- unsigned long call_processtap;
- unsigned long call_processarp;
+ unsigned long call_processtun;
unsigned long call_processipout;
unsigned long call_processudp;
unsigned long call_sessionbyip;
#define SET_STAT(x, y)
#endif
-struct configt
+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!
int cleanup_interval; // interval between regular cleanups (in seconds)
int multi_read_count; // amount of packets to read per fd in processing loop
- char tapdevice[10]; // tap device name
+ 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;
+ unsigned long rl_rate; // default throttle rate
+ int num_tbfs; // number of throttle buckets
+
int save_state;
char accounting_dir[128];
ipt bind_address;
+ ipt peer_address;
int send_garp; // Set to true to garp for vip address on startup
int target_uid;
char old_plugins[64][MAXPLUGINS];
int next_tbf; // Next HTB id available to use
- int scheduler_fifo; // If 1, will force scheduler to use SCHED_FIFO.
- // Don't use this unless you have a dual processor machine!
- int icmp_rate; // Max number of ICMP unreachable per second to send
+ 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.
int cluster_hb_interval; // How often to send a heartbeat.
int cluster_hb_timeout; // How many missed heartbeats trigger an election.
+ u64 cluster_table_version; // # state changes processed by cluster
#ifdef BGP
+#define BGP_NUM_PEERS 2
u16 as_number;
- char bgp_peer[2][64];
- u16 bgp_peer_as[2];
+ struct {
+ char name[64];
+ u16 as;
+ int keepalive;
+ int hold;
+ } neighbour[BGP_NUM_PEERS];
#endif
-};
+} configt;
-struct config_descriptt
+enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC };
+typedef struct
{
char *key;
int offset;
int size;
- enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP } type;
-};
+ enum config_typet type;
+} config_descriptt;
+
+typedef struct
+{
+ u8 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
+ portt port; // port (host byte order)
+ portt port2; // range
+} ip_filter_portt;
+
+typedef struct
+{
+ int action; // permit/deny
+#define FILTER_ACTION_DENY 1
+#define FILTER_ACTION_PERMIT 2
+ u8 proto; // protocol: IPPROTO_* (netinet/in.h)
+ ipt src_ip; // source ip (network byte order)
+ ipt src_wild;
+ ip_filter_portt src_ports;
+ ipt dst_ip; // dest ip
+ ipt dst_wild;
+ ip_filter_portt dst_ports;
+ u8 frag; // apply to non-initial fragments
+ u8 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
+ u8 tcp_sflags; // flags set
+ u8 tcp_cflags; // flags clear
+ u32 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;
// arp.c
void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
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);
+void send_ipin(sessionidt s, u8 * buf, int len);
// radius.c
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 inittap(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 processtap(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 ip_filter(u8 *buf, int len, u8 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);
-#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);
+#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 char *data, int maxsize);
+
int sessionsetup(tunnelidt t, sessionidt s);
-int cluster_send_session(int s);
-int cluster_send_tunnel(int t);
-int cluster_send_goodbye();
+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(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);
+
+
+// icmp.c
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;
void *array[20]; \
char **strings; \
int size, i; \
- log(0, 0, 0, t, "Backtrace follows"); \
+ LOG(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]); \
+ LOG(0, 0, t, "%s\n", strings[i]); \
} \
free(strings); \
}
-extern struct configt *config;
+extern configt *config;
extern time_t basetime; // Time when this process started.
extern time_t time_now; // Seconds since EPOCH.
-extern u32 last_sid;
+extern u32 last_id;
extern struct Tstats *_statistics;
extern ipt my_address;
extern int tun_write(u8 *data, int size);
+extern int clifd;
#define TIME (config->current_time)
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