// L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.64 2005/04/18 05:32:16 bodea Exp $
+// $Id: l2tpns.h,v 1.107 2005/12/14 02:19:15 bodea Exp $
#ifndef __L2TPNS_H__
#define __L2TPNS_H__
#include <netinet/in.h>
-#include <execinfo.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>
#include <libcli.h>
-#define VERSION "2.1.0"
+#define VERSION "2.1.15"
// Limits
#define MAXTUNNEL 500 // could be up to 65535
#define MAXSESSION 60000 // could be up to 65535
#define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
-#define RADIUS_SHIFT 5
-#define RADIUS_MASK ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
-#define MAXRADIUS ((unsigned long)(1L << RADIUS_SHIFT) * 255)
+#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 MAXETHER (1500+18) // max packet we try sending to tun
-#define MAXTEL 96 // telephone number
+#define MAXCONTROL 1000 // max length control message we ever send...
+#define MINMTU 576 // minimum recommended MTU (rfc1063)
+#define PPPMTU 1500 // default PPP MTU
+#define MAXMTU 2600 // arbitrary maximum MTU
+#define MAXETHER (MAXMTU+18) // max packet we try sending to tun
+#define MAXTEL 96 // telephone number
#define MAXUSER 128 // username
#define MAXPASS 128 // password
#define MAXPLUGINS 20 // maximum number of plugins to load
#define MAXRADSERVER 10 // max radius servers
-#define MAXROUTE 10 // max static routes per session
+#define 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 CONFIGFILE FLASHDIR "/startup-config" // Configuration file
#define CLIUSERS FLASHDIR "/users" // CLI Users file
#define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
-#define ACCT_TIME 3000 // 5 minute accounting interval
-#define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
-#define L2TPPORT 1701 // L2TP port
-#define RADPORT 1645 // old radius port...
-#define PKTARP 0x0806 // ARP packet type
-#define PKTIP 0x0800 // 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 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
AccessReject,
AccountingRequest,
AccountingResponse,
- AccessChallenge = 11
+ 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
+
+// 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 uint16_t sessionidt;
typedef uint16_t tunnelidt;
sessionidt next; // next session in linked list
sessionidt far; // far end session ID
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
uint32_t unique_id; // unique session id
- uint16_t nr; // next receive
- uint16_t ns; // next send
+ char reserved_2[4]; // unused: was ns/nr
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 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
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.
- uint32_t flags; // Various session flags.
- uint8_t walled_garden; // is this session gardened?
- char random_vector[MAXTEL];
int random_vector_length;
+ 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
uint32_t rx_connect_speed;
in_addr_t snoop_ip; // Interception destination IP
uint16_t snoop_port; // Interception destination port
- uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
- uint8_t filter_out; // output filter index
- struct in6_addr ipv6route; // Static IPv6 route
+ uint8_t walled_garden; // is this session gardened?
uint8_t ipv6prefixlen; // IPv6 route prefix length
- char reserved[1]; // Space to expand structure without changing HB_VERSION
+ struct in6_addr ipv6route; // Static IPv6 route
+ char reserved_3[11]; // Space to expand structure without changing HB_VERSION
}
sessiont;
-#define SF_IPCP_ACKED 1 // Has this session seen an IPCP Ack?
-#define SF_LCP_ACKED 2 // LCP negotiated
-#define SF_CCP_ACKED 4 // CCP negotiated
-#define SF_IPV6CP_ACKED 8 // IPv6 negotiated
-#define SF_IPV6_NACKED 16 // IPv6 rejected
-#define SF_IPV6_ROUTED 32 // advertised v6 route
-
#define AUTHPAP 1 // allow PAP
#define AUTHCHAP 2 // allow CHAP
typedef struct
{
+ // 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;
+
// 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;
} sessionlocalt;
-#define SESSIONPFC 1 // PFC negotiated flags
-#define SESSIONACFC 2 // ACFC negotiated flags
+// 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
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
}
tunnelt;
-// 180 bytes per radius session
+// 160 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
uint8_t id; // ID for PPP response
uint8_t try; // which try we are on
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
+ RADIUSINTERIM, // sending interim accounting to RADIUS server
RADIUSWAIT, // waiting timeout before available, in case delayed replies
- RADIUSDEAD, // errored while talking to radius server.
};
struct Tstats
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;
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 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;
+ int radius_interim;
in_addr_t radiusserver[MAXRADSERVER]; // radius servers
uint16_t radiusport[MAXRADSERVER]; // radius base ports
uint8_t numradiusservers; // radius server count
- short num_radfds; // Number of radius filehandles allocated
+
+ uint16_t radius_dae_port; // local port for radius dae
char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
int radius_authtypes;
int radius_authprefer;
+ int allow_duplicate_users; // allow multiple logins with the same username
+
in_addr_t default_dns1, default_dns2;
unsigned long rl_rate; // default throttle rate
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 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
int cluster_highest_sessionid;
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.
+
#ifdef BGP
#define BGP_NUM_PEERS 2
uint16_t as_number;
#endif
} configt;
-enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
+enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
typedef struct
{
char *key;
// ppp.c
-void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
-void sendchap(tunnelidt t, sessionidt s);
-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 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 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);
+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);
// radius.c
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);
// l2tpns.c
clockt backoff(uint8_t try);
-void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
+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 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 sessionshutdown(sessionidt s, char *reason, int result, int error);
+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);
-void sendipcp(tunnelidt t, sessionidt s);
+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(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
+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);
#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);
+void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
+
-int sessionsetup(tunnelidt t, sessionidt s);
+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);
// icmp.c
-void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
+void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
extern tunnelt *tunnel;
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 char main_quit;
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;
-
+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,
+ } 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)
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