additional length checks in processlcp

[l2tpns.git] / l2tpns.h

diff --git a/l2tpns.h b/l2tpns.h
index cd6e005..0bc90ab 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,11 +1,10 @@
 // L2TPNS Global Stuff
 // L2TPNS Global Stuff

-// $Id: l2tpns.h,v 1.86 2005-08-31 12:38:38 bodea Exp $
+// $Id: l2tpns.h,v 1.109 2005-12-20 04:57:16 bodea Exp $

 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__
 
 #include <netinet/in.h>
 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__
 
 #include <netinet/in.h>

-#include <execinfo.h>

 #include <stdio.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <signal.h>
 #include <stdlib.h>


@@ -15,7 +14,7 @@
 #include <sys/types.h>
 #include <libcli.h>
 
 #include <sys/types.h>
 #include <libcli.h>
 

-#define VERSION        "2.1.5"
+#define VERSION        "2.1.16"

 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535
 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535


@@ -23,28 +22,30 @@
 #define MAXTBFS                6000            // Maximum token bucket filters. Might need up to 2 * session.
 
 #define RADIUS_SHIFT   6
 #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_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 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 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 MAXUSER                128             // username
 #define MAXPASS                128             // password
 #define MAXPLUGINS     20              // maximum number of plugins to load
 #define MAXRADSERVER   10              // max radius servers
 #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 BUSY_WAIT_TIME 3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
 #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 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
 
 // Constants
 #ifndef ETCDIR


@@ -74,18 +75,18 @@
 #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 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 L2TPPORT       1701                            // L2TP port

 #define RADPORT                1645                            // old radius port...
 #define DAEPORT                3799                            // DAE 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 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 PPPIP          0x0021
 #define PPPIPV6                0x0057
 #define PPPMP          0x003D


@@ -146,7 +147,14 @@ enum {
 
 // reset state machine counters
 #define initialise_restart_count(_s, _fsm)                     \
 
 // 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) ({                                \
 
 // stop timer on change to state where timer does not run
 #define change_state(_s, _fsm, _new) ({                                \


@@ -219,20 +227,19 @@ typedef struct
        sessionidt next;                // next session in linked list
        sessionidt far;                 // far end session ID
        tunnelidt tunnel;               // near end tunnel ID
        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
        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;
        } 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
        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 pin, pout;             // packet counts
        uint32_t cin, cout;             // byte counts
        uint32_t magic;                 // ppp magic number
        uint32_t pin, pout;             // packet counts
        uint32_t cin, cout;             // byte counts


@@ -262,7 +269,7 @@ typedef struct
        uint8_t walled_garden;          // is this session gardened?
        uint8_t ipv6prefixlen;          // IPv6 route prefix length
        struct in6_addr ipv6route;      // Static IPv6 route
        uint8_t walled_garden;          // is this session gardened?
        uint8_t ipv6prefixlen;          // IPv6 route prefix length
        struct in6_addr ipv6route;      // Static IPv6 route

-       char reserved[11];              // Space to expand structure without changing HB_VERSION
+       char reserved_3[11];            // Space to expand structure without changing HB_VERSION

 }
 sessiont;
 
 }
 sessiont;
 


@@ -286,9 +293,15 @@ typedef struct
                int nak_sent;
        } lcp, ipcp, ipv6cp, ccp;
 
                int nak_sent;
        } lcp, ipcp, ipv6cp, ccp;
 

+       // identifier for Protocol-Reject, Code-Reject
+       uint8_t lcp_ident;
+

        // authentication to use
        int lcp_authtype;
 
        // authentication to use
        int lcp_authtype;
 

+       // our MRU
+       uint16_t ppp_mru;
+

        // DoS prevention
        clockt last_packet_out;
        uint32_t packets_out;
        // DoS prevention
        clockt last_packet_out;
        uint32_t packets_out;


@@ -299,10 +312,15 @@ typedef struct
 
        // interim RADIUS
        time_t last_interim;
 
        // interim RADIUS
        time_t last_interim;

+
+       // last LCP Echo
+       time_t last_echo;

 } sessionlocalt;
 
 } 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
 
 // 168 bytes per tunnel
 typedef struct


@@ -315,7 +333,7 @@ typedef struct
        uint16_t ns;            // next send
        int state;              // current state (tunnelstate enum)
        clockt last;            // when last control message sent (used for resend timeout)
        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
        clockt die;             // being closed, when to finally free
        clockt lastrec;         // when the last control message was received
        char hostname[128];     // tunnel hostname


@@ -508,7 +526,9 @@ typedef struct
 
        char            tundevice[10];                  // tun device name
        char            log_filename[128];
 
        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
 
 
        char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 


@@ -570,6 +590,7 @@ typedef struct
        int             cluster_last_hb_ver;            // Heartbeat version last seen from master
        int             cluster_num_changes;            // Number of changes queued.
 
        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
        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


@@ -592,7 +613,7 @@ typedef struct
 #endif
 } configt;
 
 #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;
 typedef struct
 {
        char *key;


@@ -672,6 +693,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
 void sendlcp(sessionidt s, tunnelidt t);
 void send_ipin(sessionidt s, uint8_t *buf, int len);
 void sendccp(sessionidt s, tunnelidt t);
 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
 
 
 // radius.c


@@ -698,6 +720,8 @@ 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);
 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 sendipcp(sessionidt s, tunnelidt t);
 void sendipv6cp(sessionidt s, tunnelidt t);
 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);


@@ -716,6 +740,7 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
 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);
 
 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);
 int sessionsetup(sessionidt s, tunnelidt t);
 int run_plugins(int plugin_type, void *data);
 void rebuild_address_pool(void);


@@ -741,21 +766,6 @@ extern sessionlocalt *sess_local;
 extern ippoolt *ip_address_pool;
 #define sessionfree (session[0].next)
 
 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:\n"); \
-       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 configt *config;
 extern time_t basetime;                // Time when this process started.


@@ -764,7 +774,6 @@ extern char main_quit;
 extern uint32_t last_id;
 extern struct Tstats *_statistics;
 extern in_addr_t my_address;
 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;
 
 extern int clifd;
 extern int epollfd;
 


@@ -784,6 +793,9 @@ struct event_data {
 
 #define TIME (config->current_time)
 
 
 #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)
 // 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)