X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/98efdea254a5bd06214966a4f38b655bedc98870..2c6957f223400fb892349fac5d521b89d12610df:/l2tpns.h diff --git a/l2tpns.h b/l2tpns.h index d306f67..f38e9f3 100644 --- a/l2tpns.h +++ b/l2tpns.h @@ -1,63 +1,112 @@ // L2TPNS Global Stuff -// $Id: l2tpns.h,v 1.5 2004/05/24 04:24:06 fred_nerk Exp $ +// $Id: l2tpns.h,v 1.121 2009/12/08 14:49:28 bodea Exp $ + +#ifndef __L2TPNS_H__ +#define __L2TPNS_H__ #include #include -#include +#include +#include +#include +#include +#include +#include +#include -#define VERSION "1.2.0" +#define VERSION "2.2.0" // Limits #define MAXTUNNEL 500 // could be up to 65535 -#define MAXSESSION 50000 // 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 MAXCONTROL 1000 // max length control message we ever send... -#define MAXETHER (1500+18) // max packet we try sending to tap -#define MAXTEL 96 // telephone number +#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 MAXPLUGINS 20 // maximum number of plugins to load #define MAXRADSERVER 10 // max radius servers -#define MAXROUTE 10 // max static routes per session +#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 +#define ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation +#define IDLE_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 750 // Maximum length for Multilink fragment (MTU / 2 sessions) +#define MAXFRAGNUM 128 // 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 127 // Must be equal to MAXFRAGNUM-1 // Constants -#define STATISTICS -#define STAT_CALLS -#define RINGBUFFER -#define TAPDEVICE "/dev/net/tun" -#define UDP 17 -#define HOMEDIR "/home/l2tpns/" // Base dir for data -#define STATEFILE "/tmp/l2tpns.dump" // State dump file -#define NOSTATEFILE "/tmp/l2tpns.no_state_reload" // If exists, state will not be reloaded -#define CONFIGFILE ETCDIR "/l2tpns.cfg" // Configuration file -#define CLIUSERS ETCDIR "/l2tpns.users" // CLI Users file -#define IPPOOLFILE ETCDIR "/l2tpns.ip_pool" // Address pool configuration +#ifndef ETCDIR +#define ETCDIR "/etc/l2tpns" +#endif + #ifndef LIBDIR #define LIBDIR "/usr/lib/l2tpns" #endif -#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) -#define PPPPAP 0xC023 -#define PPPCHAP 0xC223 -#define PPPLCP 0xC021 -#define PPPIPCP 0x8021 -#define PPPCCP 0x80FD + +#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 0x20 -enum -{ +#define MIN_IP_SIZE 0x19 + +enum { ConfigReq = 1, ConfigAck, ConfigNak, @@ -68,129 +117,344 @@ enum ProtocolRej, EchoReq, EchoReply, - DiscardRequest + 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 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]; - -// dump header: update number if internal format changes -#define DUMP_MAGIC "L2TPNS#" VERSION "#" +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 routes // route +typedef struct // route { - ipt ip; - ipt mask; + in_addr_t ip; + int prefixlen; } 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 + union { + uint8_t buf[MAXCONTROL]; + uint16_t buf16[MAXCONTROL/2]; + } __attribute__ ((__transparent_union__)); } controlt; -typedef struct stbft -{ - char handle[10]; - char in_use; -} tbft; +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 + uint8_t flags; // MP frame flags + uint32_t seq; // fragment seq num + uint16_t length; // Fragment length + uint8_t data[MAXFRAGLEN]; // Fragment data +} fragmentt; -// 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 + 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; + char reserved_1[2]; // unused: padding + in_addr_t 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 + uint32_t unique_id; // unique session id + char reserved_2[4]; // unused: was ns/nr + 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 mru; // maximum receive unit 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) - ipt dns1, dns2; // DNS servers + 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 - u16 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 gardened? - u16 mru; // maximum receive unit - u16 tbf; // filter bucket for throttling - char random_vector[MAXTEL]; + 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; - char user[129]; // user (needed in seesion for radius stop messages) + uint8_t random_vector[MAXTEL]; + char user[MAXUSER]; // 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; + uint32_t tx_connect_speed; + uint32_t rx_connect_speed; + clockt timeout; // Session timeout + uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit + uint8_t mssf; // Multilink Short Sequence Number Header Format + epdist epdis; // Multilink Endpoint Discriminator + bundleidt bundle; // Multilink Bundle Identifier + in_addr_t snoop_ip; // Interception destination IP + uint16_t snoop_port; // Interception destination port + uint8_t walled_garden; // is this session gardened? + uint8_t ipv6prefixlen; // IPv6 route prefix length + struct in6_addr ipv6route; // Static IPv6 route + char reserved_3[11]; // Space to expand structure without changing HB_VERSION } sessiont; -#define SESSIONPFC 1 // PFC negotiated flags -#define SESSIONACFC 2 // ACFC negotiated flags +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; +} 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 tunnels +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 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 - 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 +// 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 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) + uint8_t term_cause; // Stop record: Acct-Terminate-Cause + char const *term_msg; // terminate reason } radiust; typedef struct { - ipt address; + in_addr_t address; // Host byte order.. char assigned; // 1 if assigned, 0 if free sessionidt session; clockt last; // last used @@ -205,7 +469,6 @@ struct Tringbuffer char level; sessionidt session; tunnelidt tunnel; - ipt address; char message[MAX_LOG_LENGTH]; } buffer[RINGBUFFER_SIZE]; int head; @@ -222,7 +485,25 @@ enum TUNNELFREE, // Not in use TUNNELOPEN, // Active tunnel TUNNELDIE, // Currently closing - TUNNELOPENING // Busy opening + 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 @@ -230,257 +511,471 @@ 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 + 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; - - 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_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 -#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 -struct configt +#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 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[IFNAMSIZ]; // tun device name char log_filename[128]; - char l2tpsecret[64]; + + 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; - ipt radiusserver[MAXRADSERVER]; // radius servers - u8 numradiusservers; // radius server count - short num_radfds; // Number of radius filehandles allocated + 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; - ipt default_dns1, default_dns2; + int allow_duplicate_users; // allow multiple logins with the same username + int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0" - ipt snoop_destination_host; - u16 snoop_destination_port; + in_addr_t default_dns1, default_dns2; + + unsigned long rl_rate; // default throttle rate + int num_tbfs; // number of throttle buckets - unsigned long rl_rate; - int save_state; - uint32_t cluster_address; - int ignore_cluster_updates; char accounting_dir[128]; - ipt bind_address; - int target_uid; + 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 +} configt; -struct config_descriptt +enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 }; +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 +{ + 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, 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 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); -void initlcp(tunnelidt t, sessionidt s); -void dumplcp(char *p, int l); +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(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); +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 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); +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 sessionshutdown(sessionidt s, char *reason); -void sessionsendarp(sessionidt s); -void send_garp(ipt ip); +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 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); -void dump_acct_info(); -void mainloop(void); -#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, u8 routes); -int cluster_send_session(int s); -int cluster_send_tunnel(int t); -int cluster_send_goodbye(); +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_hostname(char *hostname); void cli_do_file(FILE *fh); void cli_do(int sockfd); -#ifdef RINGBUFFER -void ringbuffer_dump(FILE *stream); -#endif -void initplugins(); -int run_plugins(int plugin_type, void *data); -void add_plugin(char *plugin_name); -void remove_plugin(char *plugin_name); -void tunnelclear(tunnelidt t); -void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len); +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) -#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 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) + +// 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__ */