llc_c_ev.c | Explore in Territory

/*
 * llc_c_ev.c - Connection component state transition event qualifiers
 *
 * A 'state' consists of a number of possible event matching functions,
 * the actions associated with each being executed when that event is
 * matched; a 'state machine' accepts events in a serial fashion from an
 * event queue. Each event is passed to each successive event matching
 * function until a match is made (the event matching function returns
 * success, or '0') or the list of event matching functions is exhausted.
 * If a match is made, the actions associated with the event are executed
 * and the state is changed to that event's transition state. Before some
 * events are recognized, even after a match has been made, a certain
 * number of 'event qualifier' functions must also be executed. If these
 * all execute successfully, then the event is finally executed.
 *
 * These event functions must return 0 for success, to show a matched
 * event, of 1 if the event does not match. Event qualifier functions
 * must return a 0 for success or a non-zero for failure. Each function
 * is simply responsible for verifying one single thing and returning
 * either a success or failure.
 *
 * All of followed event functions are described in 802.2 LLC Protocol
 * standard document except two functions that we added that will explain
 * in their comments, at below.
 *
 * Copyright (c) 1997 by Procom Technology, Inc.
 * 		 2001-2003 by Arnaldo Carvalho de Melo <[email protected]>
 *
 * This program can be redistributed or modified under the terms of the
 * GNU General Public License as published by the Free Software Foundation.
 * This program is distributed without any warranty or implied warranty
 * of merchantability or fitness for a particular purpose.
 *
 * See the GNU General Public License for more details.
 */
#include <linux/netdevice.h>
#include <net/llc_conn.h>
#include <net/llc_sap.h>
#include <net/sock.h>
#include <net/llc_c_ac.h>
#include <net/llc_c_ev.h>
#include <net/llc_pdu.h>

#if 1
#define dprintk(args...) …
#else
#define dprintk …
#endif

/**
 *	llc_util_ns_inside_rx_window - check if sequence number is in rx window
 *	@ns: sequence number of received pdu.
 *	@vr: sequence number which receiver expects to receive.
 *	@rw: receive window size of receiver.
 *
 *	Checks if sequence number of received PDU is in range of receive
 *	window. Returns 0 for success, 1 otherwise
 */
static u16 llc_util_ns_inside_rx_window(u8 ns, u8 vr, u8 rw)
{ … }

/**
 *	llc_util_nr_inside_tx_window - check if sequence number is in tx window
 *	@sk: current connection.
 *	@nr: N(R) of received PDU.
 *
 *	This routine checks if N(R) of received PDU is in range of transmit
 *	window; on the other hand checks if received PDU acknowledges some
 *	outstanding PDUs that are in transmit window. Returns 0 for success, 1
 *	otherwise.
 */
static u16 llc_util_nr_inside_tx_window(struct sock *sk, u8 nr)
{ … }

int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_bad_pdu(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk,
					      struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk,
					      struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk,
					     struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk,
					      struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk,
					      struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk,
					      struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk,
					     struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk,
					       struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk,
					       struct sk_buff *skb)
{ … }

int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_busy_tmr_exp(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_init_p_f_cycle(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb)
{ … }

/* Event qualifier functions
 *
 * these functions simply verify the value of a state flag associated with
 * the connection and return either a 0 for success or a non-zero value
 * for not-success; verify the event is the type we expect
 */
int llc_conn_ev_qlfy_data_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_data_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_data_flag_eq_2(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_p_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{ … }

/**
 *	llc_conn_ev_qlfy_last_frame_eq_1 - checks if frame is last in tx window
 *	@sk: current connection structure.
 *	@skb: current event.
 *
 *	This function determines when frame which is sent, is last frame of
 *	transmit window, if it is then this function return zero else return
 *	one.  This function is used for sending last frame of transmit window
 *	as I-format command with p-bit set to one. Returns 0 if frame is last
 *	frame, 1 otherwise.
 */
int llc_conn_ev_qlfy_last_frame_eq_1(struct sock *sk, struct sk_buff *skb)
{ … }

/**
 *	llc_conn_ev_qlfy_last_frame_eq_0 - checks if frame isn't last in tx window
 *	@sk: current connection structure.
 *	@skb: current event.
 *
 *	This function determines when frame which is sent, isn't last frame of
 *	transmit window, if it isn't then this function return zero else return
 *	one. Returns 0 if frame isn't last frame, 1 otherwise.
 */
int llc_conn_ev_qlfy_last_frame_eq_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_p_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_p_flag_eq_f(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_remote_busy_eq_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_remote_busy_eq_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_retry_cnt_lt_n2(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_retry_cnt_gte_n2(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_s_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_s_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_cause_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_cause_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_conn(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_disc(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_failed(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_remote_busy(struct sock *sk,
					    struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_refuse(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_conflict(struct sock *sk, struct sk_buff *skb)
{ … }

int llc_conn_ev_qlfy_set_status_rst_done(struct sock *sk, struct sk_buff *skb)
{ … }
linux/net/llc/llc_c_ev.c
