X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/e98737a1683046b634692bd9e5406e53b89a65c9..28a49c442bdb926f79de1bd39821b77dda7d862d:/l2tpns.h diff --git a/l2tpns.h b/l2tpns.h index f007154..99c685d 100644 --- a/l2tpns.h +++ b/l2tpns.h @@ -1,22 +1,36 @@ // L2TPNS Global Stuff -// $Id: l2tpns.h,v 1.6 2004-05-24 04:33:35 fred_nerk Exp $ +// $Id: l2tpns.h,v 1.43 2004-12-01 02:52:46 bodea Exp $ + +#ifndef __L2TPNS_H__ +#define __L2TPNS_H__ #include -#include #include -#include "config.h" +#include +#include +#include +#include +#include +#include +#include +#include -#define VERSION "1.2.0" +#define VERSION "2.0.11" // Limits #define MAXTUNNEL 500 // could be up to 65535 #define MAXSESSION 50000 // could be up to 65535 +#define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session. + #define RADIUS_SHIFT 5 #define RADIUS_MASK ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT))) -#define MAXRADIUS ((2 << (RADIUS_SHIFT - 1)) * 255) +#define 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 @@ -26,26 +40,45 @@ #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 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 + +#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 STATEFILE DATADIR "/state.dump" // State dump file +#define CONFIGFILE FLASHDIR "/startup-config" // Configuration file +#define CLIUSERS FLASHDIR "/users" // CLI Users file +#define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration #define ACCT_TIME 3000 // 5 minute accounting interval #define L2TPPORT 1701 // L2TP port #define RADPORT 1645 // old radius port... -#define 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) @@ -56,7 +89,7 @@ #define PPPCCP 0x80FD #define PPPIP 0x0021 #define PPPMP 0x003D -#define MIN_IP_SIZE 0x20 +#define MIN_IP_SIZE 0x19 enum { ConfigReq = 1, @@ -69,7 +102,8 @@ enum ProtocolRej, EchoReq, EchoReply, - DiscardRequest + DiscardRequest, + IdentRequest }; // Types @@ -83,11 +117,36 @@ typedef u16 tunnelidt; typedef u32 clockt; typedef u8 hasht[16]; +// CLI actions +struct cli_session_actions { + char action; + ipt snoop_ip; + u16 snoop_port; + int throttle_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; @@ -102,22 +161,14 @@ typedef struct controls // control message } controlt; -typedef struct stbft -{ - char handle[10]; - char in_use; -} 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 + tunnelidt tunnel; // near end tunnel ID + ipt ip; // IP of session set by RADIUS response (host byte order). int ip_pool_index; // index to IP pool - unsigned long sid; // session id for hsddb + unsigned long unique_id; // unique session id u16 nr; // next receive u16 ns; // next send u32 magic; // ppp magic number @@ -126,33 +177,53 @@ typedef struct sessions 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 clockt opened; // when started clockt die; // being closed, when to finally free time_t last_packet; // Last packet from the user (used for idle timeouts) ipt dns1, dns2; // DNS servers routet route[MAXROUTE]; // static routes u16 radius; // which radius session is being used (0 for not waiting on authentication) - 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 + u16 tbf_in; // filter bucket for throttling in from the user. + u16 tbf_out; // filter bucket for throttling out to the user. + u8 l2tp_flags; // various bit flags from the ICCN on the l2tp tunnel. + u8 reserved_old_snoop; // No longer used - remove at some time + u8 walled_garden; // is this session gardened? + u8 flags1; // additional flags (currently unused); char random_vector[MAXTEL]; int random_vector_length; - char user[129]; // user (needed in seesion for radius stop messages) + 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 - unsigned long tx_connect_speed; - unsigned long rx_connect_speed; + 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 } 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 + +typedef struct +{ + u32 cin; + u32 cout; +} sessioncountt; + +#define SESSIONPFC 1 // PFC negotiated flags +#define SESSIONACFC 2 // ACFC negotiated flags // 168 bytes per tunnel -typedef struct tunnels +typedef struct { tunnelidt far; // far end tunnel ID ipt ip; // Ip for far end @@ -175,7 +246,7 @@ typedef struct tunnels tunnelt; // 180 bytes per radius session -typedef struct radiuss // outstanding RADIUS requests +typedef struct // outstanding RADIUS requests { sessionidt session; // which session this applies to hasht auth; // request authenticator @@ -191,7 +262,7 @@ radiust; typedef struct { - ipt address; + ipt address; // Host byte order.. char assigned; // 1 if assigned, 0 if free sessionidt session; clockt last; // last used @@ -206,7 +277,6 @@ struct Tringbuffer char level; sessionidt session; tunnelidt tunnel; - ipt address; char message[MAX_LOG_LENGTH]; } buffer[RINGBUFFER_SIZE]; int head; @@ -223,7 +293,8 @@ enum TUNNELFREE, // Not in use TUNNELOPEN, // Active tunnel TUNNELDIE, // Currently closing - TUNNELOPENING // Busy opening + TUNNELOPENING, // Busy opening + TUNNELUNDEF, // Undefined }; enum @@ -234,7 +305,8 @@ enum 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 + RADIUSWAIT, // waiting timeout before available, in case delayed replies + RADIUSDEAD, // errored while talking to radius server. }; struct Tstats @@ -242,12 +314,12 @@ 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 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; @@ -259,11 +331,7 @@ struct Tstats 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; @@ -278,9 +346,11 @@ struct Tstats unsigned long ip_allocated; unsigned long ip_freed; -#ifdef STAT_CALLS - unsigned long call_processtap; - unsigned long call_processarp; + + unsigned long c_forwarded; + unsigned long recv_forward; +#ifdef STATISTICS + unsigned long call_processtun; unsigned long call_processipout; unsigned long call_processudp; unsigned long call_sessionbyip; @@ -310,64 +380,164 @@ struct Tstats }; #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(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 +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[10]; // tun device name char log_filename[128]; char l2tpsecret[64]; char radiussecret[64]; int radius_accounting; ipt radiusserver[MAXRADSERVER]; // radius servers + u16 radiusport[MAXRADSERVER]; // radius base ports u8 numradiusservers; // radius server count short num_radfds; // Number of radius filehandles allocated ipt default_dns1, default_dns2; - ipt snoop_destination_host; - u16 snoop_destination_port; + 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; + ipt 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> + + u32 cluster_address; // Multicast address of cluster. + // Send to this address to have everyone hear. + char cluster_interface[64]; // Which interface to listen for multicast on. + int cluster_iam_master; // Are we the cluster master??? + int cluster_iam_uptodate; // Set if we've got a full set of state from the master. + u32 cluster_master_address; // The network address of the cluster master. + // Zero if i am the cluster master. + int cluster_seq_number; // Sequence number of the next heartbeat we'll send out + // (or the seq number we're next expecting if we're a slave). + int cluster_undefined_sessions; // How many sessions we're yet to receive from the master. + int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master. + int cluster_highest_sessionid; + int cluster_highest_tunnelid; + clockt cluster_last_hb; // Last time we saw a heartbeat from the master. + int cluster_num_changes; // Number of changes queued. + + int cluster_hb_interval; // How often to send a heartbeat. + int cluster_hb_timeout; // How many missed heartbeats trigger an election. + +#ifdef BGP +#define BGP_NUM_PEERS 2 + u16 as_number; + struct { + char name[64]; + u16 as; + int keepalive; + int hold; + } neighbour[BGP_NUM_PEERS]; +#endif +} configt; -struct config_descriptt +enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC }; +typedef struct { char *key; int offset; int size; - enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP } type; -}; + enum config_typet type; +} config_descriptt; + +typedef struct +{ + u8 op; // operation +#define FILTER_PORT_OP_NONE 0 // all ports match +#define FILTER_PORT_OP_EQ 1 +#define FILTER_PORT_OP_NEQ 2 +#define FILTER_PORT_OP_GT 3 +#define FILTER_PORT_OP_LT 4 +#define FILTER_PORT_OP_RANGE 5 + portt port; // port (host byte order) + portt port2; // range +} ip_filter_portt; + +typedef struct +{ + int action; // permit/deny +#define FILTER_ACTION_DENY 1 +#define FILTER_ACTION_PERMIT 2 + u8 proto; // protocol: IPPROTO_* (netinet/in.h) + ipt src_ip; // source ip (network byte order) + ipt src_wild; + ip_filter_portt src_ports; + ipt dst_ip; // dest ip + ipt dst_wild; + ip_filter_portt dst_ports; + u8 frag; // apply to non-initial fragments + u8 tcp_flag_op; // match type: any, all, established +#define FILTER_FLAG_OP_ANY 1 +#define FILTER_FLAG_OP_ALL 2 +#define FILTER_FLAG_OP_EST 3 + u8 tcp_sflags; // flags set + u8 tcp_cflags; // flags clear + u32 counter; // match count +} ip_filter_rulet; + +#define TCP_FLAG_FIN 0x01 +#define TCP_FLAG_SYN 0x02 +#define TCP_FLAG_RST 0x04 +#define TCP_FLAG_PSH 0x08 +#define TCP_FLAG_ACK 0x10 +#define TCP_FLAG_URG 0x20 + +#define MAXFILTER 32 +#define MAXFILTER_RULES 32 +typedef struct +{ + char name[32]; // ACL name + int extended; // type: 0 = standard, 1 = extended + ip_filter_rulet rules[MAXFILTER_RULES]; + int used; // session ref count +} ip_filtert; // arp.c void sendarp(int ifr_idx, const unsigned char* mac, ipt ip); @@ -381,10 +551,9 @@ 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); +u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype); void initlcp(tunnelidt t, sessionidt s); -void dumplcp(char *p, int l); +void send_ipin(sessionidt s, u8 * buf, int len); // radius.c @@ -395,79 +564,53 @@ void radiusretry(u16 r); u16 radiusnew(sessionidt s); void radiusclear(u16 r, sessionidt s); -// throttle.c -int throttle_session(sessionidt s, int throttle); - - -// rl.c -void init_rl(); -u16 rl_create_tbf(); -u16 rl_get_tbf(); -void rl_done_tbf(u16 t); -void rl_destroy_tbf(u16 t); - // l2tpns.c -clockt now(void); clockt backoff(u8 try); -void routeset(ipt ip, ipt mask, ipt gw, u8 add); -void inittap(void); -void initudp(void); -void initdata(void); -void initippool(); sessionidt sessionbyip(ipt ip); sessionidt sessionbyuser(char *username); void sessionshutdown(sessionidt s, char *reason); -void sessionsendarp(sessionidt s); void send_garp(ipt ip); -void sessionkill(sessionidt s, char *reason); -void control16(controlt * c, u16 avp, u16 val, u8 m); -void control32(controlt * c, u16 avp, u32 val, u8 m); -void controls(controlt * c, u16 avp, char *val, u8 m); -void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m); -controlt *controlnew(u16 mtype); -void controlnull(tunnelidt t); -void controladd(controlt * c, tunnelidt t, sessionidt s); void tunnelsend(u8 * buf, u16 l, tunnelidt t); -void tunnelkill(tunnelidt t, char *reason); -void tunnelshutdown(tunnelidt t, char *reason); void sendipcp(tunnelidt t, sessionidt s); -void processipout(u8 * buf, int len); -void processarp(u8 * buf, int len); void processudp(u8 * buf, int len, struct sockaddr_in *addr); -void processtap(u8 * buf, int len); -void processcontrol(u8 * buf, int len, struct sockaddr_in *addr); -int assign_ip_address(sessionidt s); -void free_ip_address(sessionidt s); -void snoop_send_packet(char *packet, u16 size); -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 init_cli(); +void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port); +int ip_filter(u8 *buf, int len, u8 filter); +int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc); +int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc); +int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc); + +#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 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); -#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); +int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...); + + +// icmp.c void host_unreachable(ipt destination, u16 id, ipt 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) \ @@ -475,13 +618,46 @@ if (count++ < max) { \ void *array[20]; \ char **strings; \ int size, i; \ - log(0, 0, 0, t, "Backtrace follows"); \ + LOG(0, 0, t, "Backtrace follows"); \ size = backtrace(array, 10); \ strings = backtrace_symbols(array, size); \ if (strings) for (i = 0; i < size; i++) \ { \ - log(0, 0, 0, t, "%s\n", strings[i]); \ + LOG(0, 0, t, "%s\n", strings[i]); \ } \ free(strings); \ } + +extern configt *config; +extern time_t basetime; // Time when this process started. +extern time_t time_now; // Seconds since EPOCH. +extern u32 last_id; +extern struct Tstats *_statistics; +extern ipt my_address; +extern int tun_write(u8 *data, int size); +extern int clifd; + + +#define TIME (config->current_time) + +// 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__ */