X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/0c678c5a03bcdc601ea50bb7d8e273101cc5e557..97119ee512f1cfa772abbd76fa83271ea26bdb4b:/l2tpns.h?ds=inline diff --git a/l2tpns.h b/l2tpns.h index 71f8ddc..c68d9c3 100644 --- a/l2tpns.h +++ b/l2tpns.h @@ -1,11 +1,10 @@ // L2TPNS Global Stuff -// $Id: l2tpns.h,v 1.90 2005-09-15 09:34:49 bodea Exp $ +// $Id: l2tpns.h,v 1.121 2009-12-08 14:49:28 bodea Exp $ #ifndef __L2TPNS_H__ #define __L2TPNS_H__ #include -#include #include #include #include @@ -15,37 +14,51 @@ #include #include -#define VERSION "2.1.7" +#define VERSION "2.2.0" // Limits #define MAXTUNNEL 500 // could be up to 65535 +#define MAXBUNDLE 300 // could be up to 65535 +#define MAXBUNDLESES 12 // Maximum number of member links in bundle +#define MAXADDRESS 20 // Maximum length for the Endpoint Discrminiator address #define MAXSESSION 60000 // could be up to 65535 #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 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 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 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 ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation +#define IDLE_TIMEOUT 240 // Time between last packet seen and session shutdown #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 + +#define MP_BEGIN 0x80 // This value is used when (b)egin bit is set in MP header +#define MP_END 0x40 // This value is used when (e)nd bit is set in MP header +#define MP_BOTH_BITS 0xC0 // This value is used when both bits (begin and end) are set in MP header + +#define MINFRAGLEN 64 // Minumum fragment length +#define MAXFRAGLEN 750 // Maximum length for Multilink fragment (MTU / 2 sessions) +#define MAXFRAGNUM 128 // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X) + // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES +#define MAXFRAGNUM_MASK 127 // Must be equal to MAXFRAGNUM-1 // Constants #ifndef ETCDIR @@ -75,18 +88,18 @@ #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 L2TPPORT 1701 // L2TP port +#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 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 @@ -147,7 +160,23 @@ 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 + +// no more attempts +#define zero_restart_count(_s, _fsm) ({ \ + sess_local[_s]._fsm.conf_sent = \ + config->ppp_max_configure; \ + sess_local[_s]._fsm.restart = \ + time_now + config->ppp_restart_time; \ +}) + +// 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) ({ \ @@ -170,6 +199,7 @@ enum { // Types typedef uint16_t sessionidt; +typedef uint16_t bundleidt; typedef uint16_t tunnelidt; typedef uint32_t clockt; typedef uint8_t hasht[16]; @@ -215,25 +245,38 @@ typedef struct controls // control message } controlt; +typedef struct { + uint8_t length; // Endpoint Discriminator length + uint8_t addr_class; // Endpoint Discriminator class + uint8_t address[MAXADDRESS]; // Endpoint Discriminator address +} epdist; + +typedef struct { + sessionidt sid; // Fragment originating session + uint8_t flags; // MP frame flags + uint32_t seq; // fragment seq num + uint16_t length; // Fragment length + uint8_t data[MAXFRAGLEN]; // Fragment data +} fragmentt; + 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 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 pin, pout; // packet counts uint32_t cin, cout; // byte counts @@ -246,7 +289,10 @@ typedef struct uint16_t mru; // maximum receive unit clockt opened; // when started clockt die; // being closed, when to finally free + uint32_t session_timeout; // Maximum session time in seconds + uint32_t idle_timeout; // Maximum idle time in seconds time_t last_packet; // Last packet from the user (used for idle timeouts) + time_t last_data; // Last data packet to/from the user (used for idle timeouts) in_addr_t dns1, dns2; // DNS servers routet route[MAXROUTE]; // static routes uint16_t tbf_in; // filter bucket for throttling in from the user. @@ -258,15 +304,50 @@ typedef struct char calling[MAXTEL]; // calling number uint32_t tx_connect_speed; uint32_t rx_connect_speed; + clockt timeout; // Session timeout + uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit + uint8_t mssf; // Multilink Short Sequence Number Header Format + epdist epdis; // Multilink Endpoint Discriminator + bundleidt bundle; // Multilink Bundle Identifier in_addr_t snoop_ip; // Interception destination IP uint16_t snoop_port; // Interception destination port 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; +typedef struct +{ + int state; // current state (bundlestate enum) + uint32_t seq_num_t; // Sequence Number (transmission) + uint32_t timeout; // Session-Timeout for bundle + uint32_t max_seq; // Max value of sequence number field + uint8_t num_of_links; // Number of links joint to this bundle + uint32_t online_time; // The time this bundle is online + clockt last_check; // Last time the timeout is checked + uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit + uint8_t mssf; // Multilink Short Sequence Number Header Format + epdist epdis; // Multilink Endpoint Discriminator + char user[MAXUSER]; // Needed for matching member links + sessionidt current_ses; // Current session to use for sending (used in RR load-balancing) + sessionidt members[MAXBUNDLESES]; // Array for member links sessions +} +bundlet; + +typedef struct +{ + fragmentt fragment[MAXFRAGNUM]; + uint8_t reassembled_frame[MAXETHER]; // The reassembled frame + uint16_t re_frame_len; // The reassembled frame length + uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively + uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively + uint32_t M; // Minumum frame sequence number received over all bundle members + uint32_t start_seq; // Last received frame sequence number (bearing B bit) +} +fragmentationt; + #define AUTHPAP 1 // allow PAP #define AUTHCHAP 2 // allow CHAP @@ -293,6 +374,18 @@ typedef struct // authentication to use int lcp_authtype; + // our MRU + uint16_t ppp_mru; + + // our MRRU + uint16_t mp_mrru; + + // our mssf + uint16_t mp_mssf; + + // our Endpoint Discriminator + in_addr_t mp_epdis; + // DoS prevention clockt last_packet_out; uint32_t packets_out; @@ -303,10 +396,18 @@ typedef struct // interim RADIUS time_t last_interim; + + // last LCP Echo + time_t last_echo; + + // Last Multilink frame sequence number received + uint32_t last_seq; } 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 +420,7 @@ 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 @@ -331,7 +432,7 @@ typedef struct } tunnelt; -// 160 bytes per radius session +// 164 bytes per radius session typedef struct // outstanding RADIUS requests { sessionidt session; // which session this applies to @@ -342,6 +443,8 @@ typedef struct // outstanding RADIUS requests uint8_t try; // which try we are on uint8_t state; // state of radius requests uint8_t chap; // set if CHAP used (is CHAP identifier) + uint8_t term_cause; // Stop record: Acct-Terminate-Cause + char const *term_msg; // terminate reason } radiust; @@ -382,6 +485,23 @@ enum TUNNELUNDEF, // Undefined }; +enum +{ + BUNDLEFREE, // Not in use + BUNDLEOPEN, // Active bundle + BUNDLEUNDEF, // Undefined +}; + +enum +{ + NULLCLASS = 0, //End Point Discriminator classes + LOCALADDR, + IPADDR, + IEEEMACADDR, + PPPMAGIC, + PSNDN, +}; + enum { RADIUSNULL, // Not in use @@ -391,6 +511,7 @@ enum RADIUSSTOP, // sending stop accounting to RADIUS server RADIUSINTERIM, // sending interim accounting to RADIUS server RADIUSWAIT, // waiting timeout before available, in case delayed replies + RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning }; struct Tstats @@ -512,14 +633,15 @@ 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; @@ -528,13 +650,16 @@ typedef struct uint16_t radiusport[MAXRADSERVER]; // radius base ports uint8_t numradiusservers; // radius server count - uint16_t radius_dae_port; // local port for radius dae + uint16_t radius_dae_port; // port for radius DAE + uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets + uint16_t radius_bind_max; 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 + int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0" in_addr_t default_dns1, default_dns2; @@ -546,7 +671,6 @@ typedef struct in_addr_t 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]; @@ -557,6 +681,7 @@ typedef struct 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 + char epdis_addr[20]; // MP Endpoint Discriminator address in_addr_t cluster_address; // Multicast address of cluster. // Send to this address to have everyone hear. @@ -568,8 +693,10 @@ typedef struct 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_bundles; // How many bundles 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_bundleid; 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 @@ -585,6 +712,8 @@ typedef struct int cluster_master_min_adv; // Master advertises routes while the number of up to date // slaves is less than this value. + // Guest change + char guest_user[MAXUSER]; // Guest account username #ifdef BGP #define BGP_NUM_PEERS 2 @@ -598,7 +727,7 @@ typedef struct #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; @@ -659,6 +788,36 @@ typedef struct int used; // session ref count } ip_filtert; +// CDN result/error codes +#define CDN_NONE 0, 0 +#define CDN_TRY_ANOTHER 2, 7 +#define CDN_ADMIN_DISC 3, 0 +#define CDN_UNAVAILABLE 4, 0 + +// RADIUS Acct-Terminate-Cause values +#define TERM_USER_REQUEST 1 +#define TERM_LOST_CARRIER 2 +#define TERM_LOST_SERVICE 3 +#define TERM_IDLE_TIMEOUT 4 +#define TERM_SESSION_TIMEOUT 5 +#define TERM_ADMIN_RESET 6 +#define TERM_ADMIN_REBOOT 7 +#define TERM_PORT_ERROR 8 +#define TERM_NAS_ERROR 9 +#define TERM_NAS_REQUEST 10 +#define TERM_NAS_REBOOT 11 +#define TERM_PORT_UNNEEDED 12 +#define TERM_PORT_PREEMPTED 13 +#define TERM_PORT_SUSPENDED 14 +#define TERM_SERVICE_UNAVAILABLE 15 +#define TERM_CALLBACK 16 +#define TERM_USER_ERROR 17 +#define TERM_HOST_REQUEST 18 +#define TERM_SUPPLICANT_RESTART 19 +#define TERM_REAUTHENTICATION_FAILURE 20 +#define TERM_PORT_REINIT 21 +#define TERM_PORT_DISABLED 22 + // arp.c void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip); @@ -671,13 +830,17 @@ 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 processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l); +void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra); 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); +uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits); 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); +int join_bundle(sessionidt s); // radius.c @@ -687,7 +850,7 @@ void processrad(uint8_t *buf, int len, char socket_index); 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); +void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local); // l2tpns.c @@ -700,10 +863,12 @@ 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 sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause); 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); @@ -722,6 +887,7 @@ 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); + int sessionsetup(sessionidt s, tunnelidt t); int run_plugins(int plugin_type, void *data); void rebuild_address_pool(void); @@ -742,26 +908,12 @@ void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint extern tunnelt *tunnel; +extern bundlet *bundle; extern sessiont *session; extern sessionlocalt *sess_local; 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. @@ -770,7 +922,6 @@ 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 +941,9 @@ 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)