/* * llc_c_ac.c - actions performed during connection state transition. * * Description: * Functions in this module are implementation of connection component actions * Details of actions can be found in IEEE-802.2 standard document. * All functions have one connection and one event as input argument. All of * them return 0 On success and 1 otherwise. * * 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 <linux/slab.h> #include <net/llc_conn.h> #include <net/llc_sap.h> #include <net/sock.h> #include <net/llc_c_ev.h> #include <net/llc_c_ac.h> #include <net/llc_c_st.h> #include <net/llc_pdu.h> #include <net/llc.h> static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, struct sk_buff *skb); static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); #define INCORRECT … int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) { … } static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { … } static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { … } void llc_conn_set_p_flag(struct sock *sk, u8 value) { … } int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_send_ack_if_needed - check if ack is needed * @sk: current connection structure * @skb: current event * * Checks number of received PDUs which have not been acknowledged, yet, * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then * sends an RR response as acknowledgement for them. Returns 0 for * success, 1 otherwise. */ int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag * @sk: current connection structure * @skb: current event * * This action resets ack_must_be_send flag of given connection, this flag * indicates if there is any PDU which has not been acknowledged yet. * Returns 0 for success, 1 otherwise. */ int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs * @sk: current connection structure * @skb: current event * * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to * all received PDUs which have not been acknowledged, yet. ack_pf flag is * set to one if one PDU with p-bit set to one is received. Returns 0 for * success, 1 otherwise. */ static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs * @sk: current connection structure. * @skb: current event. * * This action sends an I-format PDU as acknowledge to received PDUs which * have not been acknowledged, yet, if there is any. By using of this * action number of acknowledgements decreases, this technic is called * piggy backing. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked * @sk: current connection structure. * @skb: current event. * * This action sends an RR response with f-bit set to ack_pf flag as * acknowledge to all received PDUs which have not been acknowledged, yet, * if there is any. ack_pf flag indicates if a PDU has been received with * p-bit set to one. Returns 0 for success, 1 otherwise. */ static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_inc_npta_value - tries to make value of npta greater * @sk: current connection structure. * @skb: current event. * * After "inc_cntr" times calling of this action, "npta" increase by one. * this action tries to make vale of "npta" greater as possible; number of * acknowledgements decreases by increasing of "npta". Returns 0 for * success, 1 otherwise. */ static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one * @sk: current connection structure. * @skb: current event. * * After receiving "dec_cntr" times RR command, this action decreases * "npta" by one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one * @sk: current connection structure. * @skb: current event. * * After receiving "dec_cntr" times RNR command, this action decreases * "npta" by one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_dec_tx_win_size - decreases tx window size * @sk: current connection structure. * @skb: current event. * * After receiving of a REJ command or response, transmit window size is * decreased by number of PDUs which are outstanding yet. Returns 0 for * success, 1 otherwise. */ int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 * @sk: current connection structure. * @skb: current event. * * After receiving an RR response with f-bit set to one, transmit window * size is increased by one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) { … } static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) { … } static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) { … } static void llc_conn_tmr_common_cb(struct sock *sk, u8 type) { … } void llc_conn_pf_cycle_tmr_cb(struct timer_list *t) { … } void llc_conn_busy_tmr_cb(struct timer_list *t) { … } void llc_conn_ack_tmr_cb(struct timer_list *t) { … } void llc_conn_rej_tmr_cb(struct timer_list *t) { … } int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) { … } int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) { … } /* * Non-standard actions; these not contained in IEEE specification; for * our own usage */ /** * llc_conn_disc - removes connection from SAP list and frees it * @sk: closed connection * @skb: occurred event */ int llc_conn_disc(struct sock *sk, struct sk_buff *skb) { … } /** * llc_conn_reset - resets connection * @sk : reseting connection. * @skb: occurred event. * * Stop all timers, empty all queues and reset all flags. */ int llc_conn_reset(struct sock *sk, struct sk_buff *skb) { … } /** * llc_circular_between - designates that b is between a and c or not * @a: lower bound * @b: element to see if is between a and b * @c: upper bound * * This function designates that b is between a and c or not (for example, * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 * otherwise. */ u8 llc_circular_between(u8 a, u8 b, u8 c) { … } /** * llc_process_tmr_ev - timer backend * @sk: active connection * @skb: occurred event * * This function is called from timer callback functions. When connection * is busy (during sending a data frame) timer expiration event must be * queued. Otherwise this event can be sent to connection state machine. * Queued events will process by llc_backlog_rcv function after sending * data frame. */ static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) { … }
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