X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/c5e4c2cfc092317c1e3ceb0f654f880f6a8573f4..0a443cca73698f943ac84a300079f47478ea862e:/l2tpns.h?ds=sidebyside diff --git a/l2tpns.h b/l2tpns.h index afbfe3f..f27f02e 100644 --- a/l2tpns.h +++ b/l2tpns.h @@ -1,20 +1,38 @@ // L2TPNS Global Stuff -// $Id: l2tpns.h,v 1.1 2003-12-16 07:07:39 fred_nerk Exp $ +// $Id: l2tpns.h,v 1.52 2005-01-10 07:17:37 bodea Exp $ + +#ifndef __L2TPNS_H__ +#define __L2TPNS_H__ #include +#include #include +#include +#include +#include +#include +#include +#include +#include -#include "config.h" - -#define VERSION "1.0" +#define VERSION "2.1.0" // Limits #define MAXTUNNEL 500 // could be up to 65535 #define MAXSESSION 50000 // could be up to 65535 -#define MAXRADIUS 255 +#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 ((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 MAXROUTE 10 // max static routes per session #define MAXIPPOOL 131072 // max number of ip addresses in pool @@ -22,168 +40,252 @@ #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 -#define STATISTICS -#define STAT_CALLS -#define RINGBUFFER -#define UDP 17 -#define TAPDEVICE "/dev/net/tun" -#define CLIUSERS ETCDIR "l2tpns.users" // CLI Users file -#define CONFIGFILE ETCDIR "l2tpns.cfg" // Configuration file -#define IPPOOLFILE ETCDIR "l2tpns.ip_pool" // Address pool configuration -#define STATEFILE "/tmp/l2tpns.dump" // State dump file +#ifndef ETCDIR +#define ETCDIR "/etc/l2tpns" +#endif #ifndef LIBDIR #define LIBDIR "/usr/lib/l2tpns" #endif +#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 + +#ifndef DATADIR +#define DATADIR STATEDIR +#endif + +#define TUNDEVICE "/dev/net/tun" +#define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking +#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 ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions #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) +#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 ConfigReq 1 -#define ConfigAck 2 -#define ConfigNak 3 -#define ConfigRej 4 -#define TerminateReq 5 -#define TerminateAck 6 -#define CodeRej 7 -#define ProtocolRej 8 -#define EchoReq 9 -#define EchoReply 10 -#define DiscardRequest 11 - -#undef TC_TBF -#define TC_HTB +#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 +}; // 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; + 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 + +// 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; + 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; -typedef struct stbft -{ - struct stbft *next; - char handle[10]; - char in_use; - int mark; -} tbft; - - -// 336 bytes per session -typedef struct sessions +typedef struct { - 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 - 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 id; // session id - 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 - u8 radius; // which radius session is being used (0 for not waiting on authentication) - u8 flags; // various bit flags - u8 snoop; // are we snooping this session? - u8 throttle; // is this session throttled? - u8 walled_garden; // is this session stuck in the walled garden? - u16 mru; // maximum receive unit - u16 tbf; // filter bucket for throttling + sessionidt next; // next session in linked list + sessionidt far; // far end session ID + tunnelidt tunnel; // near end tunnel ID + 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 + 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 + uint32_t id; // session id + 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) + in_addr_t dns1, dns2; // DNS servers + routet route[MAXROUTE]; // static routes + uint16_t radius; // which radius session is being used (0 for not waiting on authentication) + 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. + uint8_t reserved_old_snoop; // No longer used - remove at some time + uint8_t walled_garden; // is this session gardened? + uint8_t flags1; // additional flags (currently unused); char random_vector[MAXTEL]; int random_vector_length; - char user[129]; // user (needed in seesion for radius stop messages) - char called[MAXTEL]; // called number - char calling[MAXTEL]; // calling number - unsigned long tx_connect_speed; - unsigned long rx_connect_speed; + 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 + uint32_t tx_connect_speed; + uint32_t rx_connect_speed; + uint32_t flags; // Various session flags. + in_addr_t snoop_ip; // Interception destination IP + uint16_t snoop_port; // Interception destination port + uint16_t sid; // near end session id. + uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none) + uint8_t filter_out; // output filter index + char reserved[18]; // Space to expand structure without changing HB_VERSION } sessiont; -#define SESSIONPFC 1 // PFC negotiated flags -#define SESSIONACFC 2 // ACFC negotiated flags +#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 AUTHPAP 1 // allow PAP +#define AUTHCHAP 2 // allow CHAP + +typedef struct +{ + // byte counters + uint32_t cin; + uint32_t cout; + + // DoS prevention + clockt last_packet_out; + uint32_t packets_out; + uint32_t packets_dropped; +} sessioncountt; + +#define SESSIONPFC 1 // PFC negotiated flags +#define SESSIONACFC 2 // ACFC negotiated flags // 168 bytes per tunnel -typedef struct tunnels +typedef struct { - tunnelidt next; // next tunnel in linked list 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 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 + 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; // 180 bytes per radius session -typedef struct radiuss // outstanding RADIUS requests +typedef struct // outstanding RADIUS requests { - u8 next; // next in free list - sessionidt session; // which session this applies to - hasht auth; // request authenticator - clockt retry; // ehwne 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) + 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 + 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; - char assigned; // 1 if assigned, 0 if free + 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; @@ -194,7 +296,6 @@ struct Tringbuffer char level; sessionidt session; tunnelidt tunnel; - ipt address; char message[MAX_LOG_LENGTH]; } buffer[RINGBUFFER_SIZE]; int head; @@ -202,192 +303,396 @@ struct Tringbuffer }; #endif +/* + * Possible tunnel states + * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE + */ 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 + 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 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 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_errors; - unsigned long arp_replies; - unsigned long arp_discarded; - unsigned long arp_sent; - unsigned long arp_recv; - - 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; -#ifdef STAT_CALLS - unsigned long call_processtap; - unsigned long call_processarp; - 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; + 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_processudp; + uint32_t call_sessionbyip; + uint32_t call_sessionbyuser; + uint32_t call_sendarp; + uint32_t call_sendipcp; + 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_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 -#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 + +#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 +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 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 random_device[256]; // random device path, defaults to RANDOMDEVICE + + char radiussecret[64]; + int radius_accounting; + 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 + + 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]; + 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 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 + + 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_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. + uint64_t cluster_table_version; // # state changes processed by cluster + +#ifdef BGP +#define BGP_NUM_PEERS 2 + uint16_t as_number; + struct { + 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, IPv4, IPv6, MAC }; +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; + // 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 processipin(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, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype); -u8 *findppp(u8 * b, u8 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 dumplcp(char *p, int l); +void send_ipin(sessionidt s, uint8_t *buf, int len); // radius.c void initrad(void); -void radiussend(u8 r, u8 state); -void processrad(u8 *buf, int len); -void radiusretry(u8 r); -u8 radiusnew(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); +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 now(void); -clockt backoff(u8 try); -void routeset(ipt ip, ipt mask, ipt gw, u8 add); -void inittap(void); -void initudp(void); -void initdata(void); -void initippool(); -sessionidt sessionbyip(ipt ip); -/* NB - sessionbyuser ignores walled garden'd sessions */ +clockt backoff(uint8_t try); +sessionidt sessionbyip(in_addr_t ip); sessionidt sessionbyuser(char *username); +void random_data(uint8_t *buf, int len); 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 send_garp(in_addr_t ip); +void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t); 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); -ipt assign_ip_address(); -void free_ip_address(ipt address); -void snoop_send_packet(char *packet, u16 size); -void dump_acct_info(); -void mainloop(void); -#define log _log -#ifndef log_hex -#define log_hex(a,b,c,d) do{if (a <= 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, ...); -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, u8 routes); -int cluster_send_session(int s); -int cluster_send_tunnel(int t); -#ifdef HAVE_LIBCLI -void init_cli(); -void cli_do(int sockfd); -#endif -#ifdef RINGBUFFER -void ringbuffer_dump(FILE *stream); -#endif -void initplugins(); +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); + +#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 run_plugins(int plugin_type, void *data); -void add_plugin(char *plugin_name); -void remove_plugin(char *plugin_name); +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, ...); + + +// icmp.c +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 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, t, "Backtrace follows"); \ + size = backtrace(array, 10); \ + strings = backtrace_symbols(array, size); \ + if (strings) for (i = 0; i < size; i++) \ + { \ + LOG(0, 0, t, "%s\n", strings[i]); \ + } \ + free(strings); \ +} + + +extern configt *config; +extern time_t basetime; // Time when this process started. +extern time_t time_now; // Seconds since EPOCH. +extern uint32_t last_id; +extern struct Tstats *_statistics; +extern in_addr_t my_address; +extern int tun_write(uint8_t *data, int size); +extern int clifd; + + +#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__ */