indicate spare (struct padding) bytes

[l2tpns.git] / l2tpns.h

diff --git a/l2tpns.h b/l2tpns.h
index 2f63803..d7c29e0 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,5 +1,5 @@
 // L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.89 2005/09/13 14:23:07 bodea Exp $
+// $Id: l2tpns.h,v 1.101 2005/12/05 13:56:12 bodea Exp $
 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__
@@ -15,7 +15,7 @@
 #include <sys/types.h>
 #include <libcli.h>
 
-#define VERSION        "2.1.6"
+#define VERSION        "2.1.13"
 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535
@@ -31,8 +31,10 @@
 #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 MAXMRU         1500            // max MRU as defined by RFC1661
-#define        MAXETHER        (MAXMRU+18)     // max packet we try sending to tun
+#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
@@ -45,7 +47,6 @@
 #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
-#define DEFAULT_MRU    1452            // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
 
 // Constants
 #ifndef ETCDIR
@@ -147,7 +148,14 @@ enum {
 
 // reset state machine counters
 #define initialise_restart_count(_s, _fsm)                     \
-       sess_local[_s]._fsm.conf_sent = sess_local[_s]._fsm.nak_sent
+       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) ({                                \
@@ -220,15 +228,15 @@ typedef struct
        sessionidt next;                // next session in linked list
        sessionidt far;                 // far end session ID
        tunnelidt tunnel;               // near end tunnel ID
-       uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
+       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
-               uint8_t pad;            // unused
        } ppp;
+       char pad[2];                    // unused
        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
@@ -293,6 +301,9 @@ typedef struct
        // authentication to use
        int lcp_authtype;
 
+       // our MRU
+       uint16_t ppp_mru;
+
        // DoS prevention
        clockt last_packet_out;
        uint32_t packets_out;
@@ -303,10 +314,15 @@ typedef struct
 
        // 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
@@ -319,7 +335,7 @@ 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
@@ -512,7 +528,9 @@ typedef struct
 
        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
 
@@ -703,6 +721,8 @@ 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);
+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);
@@ -769,7 +789,6 @@ 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;
 
@@ -789,6 +808,9 @@ struct event_data {
 
 #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)