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 };
184