// L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.43 2004/12/01 02:52:46 bodea Exp $
+// $Id: l2tpns.h,v 1.65 2005/05/05 10:02:08 bodea Exp $
#ifndef __L2TPNS_H__
#define __L2TPNS_H__
#include <sys/types.h>
#include <libcli.h>
-#define VERSION "2.0.11"
+#define VERSION "2.1.0"
// Limits
#define MAXTUNNEL 500 // could be up to 65535
-#define MAXSESSION 50000 // could be up to 65535
+#define MAXSESSION 60000 // could be up to 65535
#define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
#define RADIUS_SHIFT 5
#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 MAXUSER 128 // username
+#define MAXPASS 128 // password
#define MAXPLUGINS 20 // maximum number of plugins to load
#define MAXRADSERVER 10 // max radius servers
#define MAXROUTE 10 // max static routes per session
#define LIBDIR "/usr/lib/l2tpns"
#endif
-#ifndef STATEDIR
-#define STATEDIR "/var/lib/l2tpns"
-#endif
-
#ifndef PLUGINDIR
#define PLUGINDIR LIBDIR // Plugins
#endif
#define FLASHDIR ETCDIR
#endif
-#ifndef DATADIR
-#define DATADIR STATEDIR
-#endif
-
#define TUNDEVICE "/dev/net/tun"
-#define STATEFILE DATADIR "/state.dump" // State dump file
+#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 PKTARP 0x0806 // ARP packet type
-#define PKTIP 0x0800 // IP packet type
-#define PSEUDOMAC 0x0200 // pseudo MAC prefix (local significant MAC)
+#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
-{
+
+enum {
ConfigReq = 1,
ConfigAck,
ConfigNak,
IdentRequest
};
+enum {
+ AccessRequest = 1,
+ AccessAccept,
+ AccessReject,
+ AccountingRequest,
+ AccountingResponse,
+ AccessChallenge = 11
+};
+
// 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];
+typedef uint16_t sessionidt;
+typedef uint16_t tunnelidt;
+typedef uint32_t clockt;
+typedef uint8_t hasht[16];
// CLI actions
struct cli_session_actions {
char action;
- ipt snoop_ip;
- u16 snoop_port;
+ in_addr_t snoop_ip;
+ uint16_t snoop_port;
int throttle_in;
int throttle_out;
int filter_in;
#define CLI_TUN_KILL 0x01
-// dump header: update number if internal format changes
-#define DUMP_MAGIC "L2TPNS#" VERSION "#"
-
// structures
typedef struct // route
{
- ipt ip;
- ipt mask;
+ in_addr_t ip;
+ in_addr_t mask;
}
routet;
-typedef struct controls // control message
+typedef struct controls // control message
{
- struct controls *next; // next in queue
- u16 length; // length
- u8 buf[MAXCONTROL];
+ struct controls *next; // next in queue
+ uint16_t length; // length
+ uint8_t buf[MAXCONTROL];
}
controlt;
sessionidt next; // next session in linked list
sessionidt far; // far end session ID
tunnelidt tunnel; // near end tunnel ID
- ipt ip; // IP of session set by RADIUS response (host byte order).
+ in_addr_t ip; // IP of session set by RADIUS response (host byte order).
int ip_pool_index; // index to IP pool
- unsigned long unique_id; // unique session id
- 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
- u16 throttle_in; // upstream throttle rate (kbps)
- u16 throttle_out; // downstream throttle rate
+ uint32_t unique_id; // unique session id
+ uint16_t nr; // next receive
+ uint16_t ns; // next send
+ uint32_t magic; // ppp magic number
+ uint32_t cin, cout; // byte counts
+ uint32_t pin, pout; // packet counts
+ uint32_t total_cin; // This counter is never reset while a session is open
+ uint32_t total_cout; // This counter is never reset while a session is open
+ uint16_t throttle_in; // upstream throttle rate (kbps)
+ uint16_t 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)
- ipt dns1, dns2; // DNS servers
+ in_addr_t 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 reserved_old_snoop; // No longer used - remove at some time
- u8 walled_garden; // is this session gardened?
- u8 flags1; // additional flags (currently unused);
+ uint16_t mru; // maximum receive unit
+ uint16_t tbf_in; // filter bucket for throttling in from the user.
+ uint16_t tbf_out; // filter bucket for throttling out to the user.
+ uint8_t l2tp_flags; // various bit flags from the ICCN on the l2tp tunnel.
+ uint32_t flags; // Various session flags.
+ uint8_t walled_garden; // is this session gardened?
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 user[MAXUSER]; // user (needed in seesion for radius stop messages)
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
- 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
+ uint32_t tx_connect_speed;
+ uint32_t rx_connect_speed;
+ in_addr_t snoop_ip; // Interception destination IP
+ uint16_t snoop_port; // Interception destination port
+ uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
+ uint8_t filter_out; // output filter index
+ struct in6_addr ipv6route; // Static IPv6 route
+ uint8_t ipv6prefixlen; // IPv6 route prefix length
+ char reserved[1]; // Space to expand structure without changing HB_VERSION
}
sessiont;
#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
+#define SF_IPV6CP_ACKED 8 // IPv6 negotiated
+#define SF_IPV6_NACKED 16 // IPv6 rejected
+#define SF_IPV6_ROUTED 32 // advertised v6 route
+
+#define AUTHPAP 1 // allow PAP
+#define AUTHCHAP 2 // allow CHAP
typedef struct
{
- u32 cin;
- u32 cout;
-} sessioncountt;
+ // byte counters
+ uint32_t cin;
+ uint32_t cout;
+
+ // 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;
+} sessionlocalt;
#define SESSIONPFC 1 // PFC negotiated flags
#define SESSIONACFC 2 // ACFC negotiated flags
typedef struct
{
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
+ 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 resenting pending control
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
+ 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
}
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)
+ 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)
}
radiust;
typedef struct
{
- ipt address; // Host byte order..
+ in_addr_t address; // Host byte order..
char assigned; // 1 if assigned, 0 if free
sessionidt session;
clockt last; // last used
RADIUSIPCP, // sending IPCP to end user
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
- 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;
+ 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
- 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;
+ 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_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(x)
+#define CSTAT(x) STAT(call_ ## x)
#else
#define CSTAT(x)
#endif
char log_filename[128];
char l2tpsecret[64];
+ char random_device[256]; // random device path, defaults to RANDOMDEVICE
+
char radiussecret[64];
int radius_accounting;
- ipt radiusserver[MAXRADSERVER]; // radius servers
- u16 radiusport[MAXRADSERVER]; // radius base ports
- u8 numradiusservers; // radius server count
+ int radius_interim;
+ in_addr_t radiusserver[MAXRADSERVER]; // radius servers
+ uint16_t radiusport[MAXRADSERVER]; // radius base ports
+ uint8_t numradiusservers; // radius server count
short num_radfds; // Number of radius filehandles allocated
- ipt default_dns1, default_dns2;
+ char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
+ int radius_authtypes;
+ int radius_authprefer;
+
+ in_addr_t default_dns1, default_dns2;
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;
+ in_addr_t bind_address;
+ in_addr_t peer_address;
int send_garp; // Set to true to garp for vip address on startup
int target_uid;
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 icmp_rate; // Max number of ICMP unreachable per second to send
+ int max_packets; // DoS prevention: per session limit of packets/0.1s
- u32 cluster_address; // Multicast address of cluster.
+ 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.
- u32 cluster_master_address; // The network address of the cluster 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_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.
#ifdef BGP
#define BGP_NUM_PEERS 2
- u16 as_number;
+ uint16_t as_number;
struct {
- char name[64];
- u16 as;
- int keepalive;
- int hold;
- } neighbour[BGP_NUM_PEERS];
+ char name[64];
+ uint16_t as;
+ int keepalive;
+ int hold;
+ } neighbour[BGP_NUM_PEERS];
#endif
} configt;
-enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC };
+enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
typedef struct
{
char *key;
typedef struct
{
- u8 op; // operation
+ 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
- portt port; // port (host byte order)
- portt port2; // range
+ 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
- u8 proto; // protocol: IPPROTO_* (netinet/in.h)
- ipt src_ip; // source ip (network byte order)
- ipt src_wild;
+ 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;
- ipt dst_ip; // dest ip
- ipt dst_wild;
+ in_addr_t dst_ip; // dest ip
+ in_addr_t dst_wild;
ip_filter_portt dst_ports;
- u8 frag; // apply to non-initial fragments
- u8 tcp_flag_op; // match type: any, all, established
+ 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
- u8 tcp_sflags; // flags set
- u8 tcp_cflags; // flags clear
- u32 counter; // match count
+ 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
} ip_filtert;
// arp.c
-void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
+void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t 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 processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
+void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
void sendchap(tunnelidt t, sessionidt s);
-u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
void initlcp(tunnelidt t, sessionidt s);
-void send_ipin(sessionidt s, u8 * buf, int len);
+void send_ipin(sessionidt s, uint8_t *buf, int len);
// 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);
+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);
// l2tpns.c
-clockt backoff(u8 try);
-sessionidt sessionbyip(ipt ip);
+clockt backoff(uint8_t try);
+void send_ipv6_ra(tunnelidt t, sessionidt s, 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 sessionshutdown(sessionidt s, char *reason);
-void send_garp(ipt ip);
-void tunnelsend(u8 * buf, u16 l, tunnelidt t);
+void random_data(uint8_t *buf, int len);
+void sessionkill(sessionidt s, char *reason);
+void sessionshutdown(sessionidt s, char *reason, int result, int error);
+void send_garp(in_addr_t ip);
+void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
void sendipcp(tunnelidt t, sessionidt s);
-void processudp(u8 * buf, int len, struct sockaddr_in *addr);
-void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port);
-int ip_filter(u8 *buf, int len, u8 filter);
+void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
+void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
+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);
// icmp.c
-void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
+void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
extern tunnelt *tunnel;
extern sessiont *session;
-extern sessioncountt *sess_count;
+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 u32 last_id;
+extern uint32_t last_id;
extern struct Tstats *_statistics;
-extern ipt my_address;
-extern int tun_write(u8 *data, int size);
+extern in_addr_t my_address;
+extern int tun_write(uint8_t *data, int size);
extern int clifd;
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