welterde/l2tpns
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- Add l2tp_mtu configuration option, used to define MRU, MSS.

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- Adjust TCP MSS options in SYN and SYN,ACK packets to avoid
  fragmentation of tcp packets.
This commit is contained in:
bodea 2005-09-16 05:04:28 +00:00
parent 667a8bc420
commit 42af131396
8 changed files with 132 additions and 55 deletions
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23
l2tpns.h
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@ -1,5 +1,5 @@
// L2TPNS Global Stuff
// $Id: l2tpns.h,v 1.90 2005/09/15 09:34:49 bodea Exp $
// $Id: l2tpns.h,v 1.91 2005/09/16 05:04:29 bodea Exp $
#ifndef __L2TPNS_H__
#define __L2TPNS_H__
@ -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
@ -293,6 +294,9 @@ typedef struct
// authentication to use
int lcp_authtype;
// our MRU
uint16_t ppp_mru;
// DoS prevention
clockt last_packet_out;
uint32_t packets_out;
@ -512,14 +516,15 @@ 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
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
int ppp_mru; // MRU to advertise
char radiussecret[64];
int radius_accounting;
@ -704,6 +709,8 @@ 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);
@ -770,7 +777,6 @@ 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;
@ -790,6 +796,9 @@ 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)