root/net/llc/llc_s_st.c

   1 /*
   2  * llc_s_st.c - Defines SAP component state machine transitions.
   3  *
   4  * The followed transitions are SAP component state machine transitions
   5  * which are described in 802.2 LLC protocol standard document.
   6  *
   7  * Copyright (c) 1997 by Procom Technology, Inc.
   8  *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   9  *
  10  * This program can be redistributed or modified under the terms of the
  11  * GNU General Public License as published by the Free Software Foundation.
  12  * This program is distributed without any warranty or implied warranty
  13  * of merchantability or fitness for a particular purpose.
  14  *
  15  * See the GNU General Public License for more details.
  16  */
  17 #include <linux/types.h>
  18 #include <net/llc_if.h>
  19 #include <net/llc_s_ev.h>
  20 #include <net/llc_s_ac.h>
  21 #include <net/llc_s_st.h>
  22 
  23 /* dummy last-transition indicator; common to all state transition groups
  24  * last entry for this state
  25  * all members are zeros, .bss zeroes it
  26  */
  27 static struct llc_sap_state_trans llc_sap_state_trans_end;
  28 
  29 /* state LLC_SAP_STATE_INACTIVE transition for
  30  * LLC_SAP_EV_ACTIVATION_REQ event
  31  */
  32 static const llc_sap_action_t llc_sap_inactive_state_actions_1[] = {
  33         [0] = llc_sap_action_report_status,
  34         [1] = NULL,
  35 };
  36 
  37 static struct llc_sap_state_trans llc_sap_inactive_state_trans_1 = {
  38         .ev =           llc_sap_ev_activation_req,
  39         .next_state =   LLC_SAP_STATE_ACTIVE,
  40         .ev_actions =   llc_sap_inactive_state_actions_1,
  41 };
  42 
  43 /* array of pointers; one to each transition */
  44 static struct llc_sap_state_trans *llc_sap_inactive_state_transitions[] = {
  45         [0] = &llc_sap_inactive_state_trans_1,
  46         [1] = &llc_sap_state_trans_end,
  47 };
  48 
  49 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_UI event */
  50 static const llc_sap_action_t llc_sap_active_state_actions_1[] = {
  51         [0] = llc_sap_action_unitdata_ind,
  52         [1] = NULL,
  53 };
  54 
  55 static struct llc_sap_state_trans llc_sap_active_state_trans_1 = {
  56         .ev =           llc_sap_ev_rx_ui,
  57         .next_state =   LLC_SAP_STATE_ACTIVE,
  58         .ev_actions =   llc_sap_active_state_actions_1,
  59 };
  60 
  61 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_UNITDATA_REQ event */
  62 static const llc_sap_action_t llc_sap_active_state_actions_2[] = {
  63         [0] = llc_sap_action_send_ui,
  64         [1] = NULL,
  65 };
  66 
  67 static struct llc_sap_state_trans llc_sap_active_state_trans_2 = {
  68         .ev =           llc_sap_ev_unitdata_req,
  69         .next_state =   LLC_SAP_STATE_ACTIVE,
  70         .ev_actions =   llc_sap_active_state_actions_2,
  71 };
  72 
  73 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_XID_REQ event */
  74 static const llc_sap_action_t llc_sap_active_state_actions_3[] = {
  75         [0] = llc_sap_action_send_xid_c,
  76         [1] = NULL,
  77 };
  78 
  79 static struct llc_sap_state_trans llc_sap_active_state_trans_3 = {
  80         .ev =           llc_sap_ev_xid_req,
  81         .next_state =   LLC_SAP_STATE_ACTIVE,
  82         .ev_actions =   llc_sap_active_state_actions_3,
  83 };
  84 
  85 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_XID_C event */
  86 static const llc_sap_action_t llc_sap_active_state_actions_4[] = {
  87         [0] = llc_sap_action_send_xid_r,
  88         [1] = NULL,
  89 };
  90 
  91 static struct llc_sap_state_trans llc_sap_active_state_trans_4 = {
  92         .ev =           llc_sap_ev_rx_xid_c,
  93         .next_state =   LLC_SAP_STATE_ACTIVE,
  94         .ev_actions =   llc_sap_active_state_actions_4,
  95 };
  96 
  97 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_XID_R event */
  98 static const llc_sap_action_t llc_sap_active_state_actions_5[] = {
  99         [0] = llc_sap_action_xid_ind,
 100         [1] = NULL,
 101 };
 102 
 103 static struct llc_sap_state_trans llc_sap_active_state_trans_5 = {
 104         .ev =           llc_sap_ev_rx_xid_r,
 105         .next_state =   LLC_SAP_STATE_ACTIVE,
 106         .ev_actions =   llc_sap_active_state_actions_5,
 107 };
 108 
 109 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_TEST_REQ event */
 110 static const llc_sap_action_t llc_sap_active_state_actions_6[] = {
 111         [0] = llc_sap_action_send_test_c,
 112         [1] = NULL,
 113 };
 114 
 115 static struct llc_sap_state_trans llc_sap_active_state_trans_6 = {
 116         .ev =           llc_sap_ev_test_req,
 117         .next_state =   LLC_SAP_STATE_ACTIVE,
 118         .ev_actions =   llc_sap_active_state_actions_6,
 119 };
 120 
 121 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_TEST_C event */
 122 static const llc_sap_action_t llc_sap_active_state_actions_7[] = {
 123         [0] = llc_sap_action_send_test_r,
 124         [1] = NULL,
 125 };
 126 
 127 static struct llc_sap_state_trans llc_sap_active_state_trans_7 = {
 128         .ev =           llc_sap_ev_rx_test_c,
 129         .next_state =   LLC_SAP_STATE_ACTIVE,
 130         .ev_actions =   llc_sap_active_state_actions_7
 131 };
 132 
 133 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_TEST_R event */
 134 static const llc_sap_action_t llc_sap_active_state_actions_8[] = {
 135         [0] = llc_sap_action_test_ind,
 136         [1] = NULL,
 137 };
 138 
 139 static struct llc_sap_state_trans llc_sap_active_state_trans_8 = {
 140         .ev =           llc_sap_ev_rx_test_r,
 141         .next_state =   LLC_SAP_STATE_ACTIVE,
 142         .ev_actions =   llc_sap_active_state_actions_8,
 143 };
 144 
 145 /* state LLC_SAP_STATE_ACTIVE transition for
 146  * LLC_SAP_EV_DEACTIVATION_REQ event
 147  */
 148 static const llc_sap_action_t llc_sap_active_state_actions_9[] = {
 149         [0] = llc_sap_action_report_status,
 150         [1] = NULL,
 151 };
 152 
 153 static struct llc_sap_state_trans llc_sap_active_state_trans_9 = {
 154         .ev =           llc_sap_ev_deactivation_req,
 155         .next_state =   LLC_SAP_STATE_INACTIVE,
 156         .ev_actions =   llc_sap_active_state_actions_9
 157 };
 158 
 159 /* array of pointers; one to each transition */
 160 static struct llc_sap_state_trans *llc_sap_active_state_transitions[] = {
 161         [0] = &llc_sap_active_state_trans_2,
 162         [1] = &llc_sap_active_state_trans_1,
 163         [2] = &llc_sap_active_state_trans_3,
 164         [3] = &llc_sap_active_state_trans_4,
 165         [4] = &llc_sap_active_state_trans_5,
 166         [5] = &llc_sap_active_state_trans_6,
 167         [6] = &llc_sap_active_state_trans_7,
 168         [7] = &llc_sap_active_state_trans_8,
 169         [8] = &llc_sap_active_state_trans_9,
 170         [9] = &llc_sap_state_trans_end,
 171 };
 172 
 173 /* SAP state transition table */
 174 struct llc_sap_state llc_sap_state_table[LLC_NR_SAP_STATES] = {
 175         [LLC_SAP_STATE_INACTIVE - 1] = {
 176                 .curr_state     = LLC_SAP_STATE_INACTIVE,
 177                 .transitions    = llc_sap_inactive_state_transitions,
 178         },
 179         [LLC_SAP_STATE_ACTIVE - 1] = {
 180                 .curr_state     = LLC_SAP_STATE_ACTIVE,
 181                 .transitions    = llc_sap_active_state_transitions,
 182         },
 183 };