1 | /* |
2 | * llc_s_ac.c - actions performed during sap state transition. |
3 | * |
4 | * Description : |
5 | * Functions in this module are implementation of sap component actions. |
6 | * Details of actions can be found in IEEE-802.2 standard document. |
7 | * All functions have one sap and one event as input argument. All of |
8 | * them return 0 On success and 1 otherwise. |
9 | * |
10 | * Copyright (c) 1997 by Procom Technology, Inc. |
11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
12 | * |
13 | * This program can be redistributed or modified under the terms of the |
14 | * GNU General Public License as published by the Free Software Foundation. |
15 | * This program is distributed without any warranty or implied warranty |
16 | * of merchantability or fitness for a particular purpose. |
17 | * |
18 | * See the GNU General Public License for more details. |
19 | */ |
20 | |
21 | #include <linux/netdevice.h> |
22 | #include <net/llc.h> |
23 | #include <net/llc_pdu.h> |
24 | #include <net/llc_s_ac.h> |
25 | #include <net/llc_s_ev.h> |
26 | #include <net/llc_sap.h> |
27 | |
28 | |
29 | /** |
30 | * llc_sap_action_unitdata_ind - forward UI PDU to network layer |
31 | * @sap: SAP |
32 | * @skb: the event to forward |
33 | * |
34 | * Received a UI PDU from MAC layer; forward to network layer as a |
35 | * UNITDATA INDICATION; verify our event is the kind we expect |
36 | */ |
37 | int llc_sap_action_unitdata_ind(struct llc_sap *sap, struct sk_buff *skb) |
38 | { |
39 | llc_sap_rtn_pdu(sap, skb); |
40 | return 0; |
41 | } |
42 | |
43 | /** |
44 | * llc_sap_action_send_ui - sends UI PDU resp to UNITDATA REQ to MAC layer |
45 | * @sap: SAP |
46 | * @skb: the event to send |
47 | * |
48 | * Sends a UI PDU to the MAC layer in response to a UNITDATA REQUEST |
49 | * primitive from the network layer. Verifies event is a primitive type of |
50 | * event. Verify the primitive is a UNITDATA REQUEST. |
51 | */ |
52 | int llc_sap_action_send_ui(struct llc_sap *sap, struct sk_buff *skb) |
53 | { |
54 | struct llc_sap_state_ev *ev = llc_sap_ev(skb); |
55 | int rc; |
56 | |
57 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ssap: ev->saddr.lsap, |
58 | dsap: ev->daddr.lsap, LLC_PDU_CMD); |
59 | llc_pdu_init_as_ui_cmd(skb); |
60 | rc = llc_mac_hdr_init(skb, sa: ev->saddr.mac, da: ev->daddr.mac); |
61 | if (likely(!rc)) { |
62 | skb_get(skb); |
63 | rc = dev_queue_xmit(skb); |
64 | } |
65 | return rc; |
66 | } |
67 | |
68 | /** |
69 | * llc_sap_action_send_xid_c - send XID PDU as response to XID REQ |
70 | * @sap: SAP |
71 | * @skb: the event to send |
72 | * |
73 | * Send a XID command PDU to MAC layer in response to a XID REQUEST |
74 | * primitive from the network layer. Verify event is a primitive type |
75 | * event. Verify the primitive is a XID REQUEST. |
76 | */ |
77 | int llc_sap_action_send_xid_c(struct llc_sap *sap, struct sk_buff *skb) |
78 | { |
79 | struct llc_sap_state_ev *ev = llc_sap_ev(skb); |
80 | int rc; |
81 | |
82 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U_XID, ssap: ev->saddr.lsap, |
83 | dsap: ev->daddr.lsap, LLC_PDU_CMD); |
84 | llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, rx_window: 0); |
85 | rc = llc_mac_hdr_init(skb, sa: ev->saddr.mac, da: ev->daddr.mac); |
86 | if (likely(!rc)) { |
87 | skb_get(skb); |
88 | rc = dev_queue_xmit(skb); |
89 | } |
90 | return rc; |
91 | } |
92 | |
93 | /** |
94 | * llc_sap_action_send_xid_r - send XID PDU resp to MAC for received XID |
95 | * @sap: SAP |
96 | * @skb: the event to send |
97 | * |
98 | * Send XID response PDU to MAC in response to an earlier received XID |
99 | * command PDU. Verify event is a PDU type event |
100 | */ |
101 | int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb) |
102 | { |
103 | u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap; |
104 | int rc = 1; |
105 | struct sk_buff *nskb; |
106 | |
107 | llc_pdu_decode_sa(skb, sa: mac_da); |
108 | llc_pdu_decode_da(skb, da: mac_sa); |
109 | llc_pdu_decode_ssap(skb, ssap: &dsap); |
110 | nskb = llc_alloc_frame(NULL, dev: skb->dev, LLC_PDU_TYPE_U, |
111 | data_size: sizeof(struct llc_xid_info)); |
112 | if (!nskb) |
113 | goto out; |
114 | llc_pdu_header_init(skb: nskb, LLC_PDU_TYPE_U, ssap: sap->laddr.lsap, dsap, |
115 | LLC_PDU_RSP); |
116 | llc_pdu_init_as_xid_rsp(skb: nskb, LLC_XID_NULL_CLASS_2, rx_window: 0); |
117 | rc = llc_mac_hdr_init(skb: nskb, sa: mac_sa, da: mac_da); |
118 | if (likely(!rc)) |
119 | rc = dev_queue_xmit(skb: nskb); |
120 | out: |
121 | return rc; |
122 | } |
123 | |
124 | /** |
125 | * llc_sap_action_send_test_c - send TEST PDU to MAC in resp to TEST REQ |
126 | * @sap: SAP |
127 | * @skb: the event to send |
128 | * |
129 | * Send a TEST command PDU to the MAC layer in response to a TEST REQUEST |
130 | * primitive from the network layer. Verify event is a primitive type |
131 | * event; verify the primitive is a TEST REQUEST. |
132 | */ |
133 | int llc_sap_action_send_test_c(struct llc_sap *sap, struct sk_buff *skb) |
134 | { |
135 | struct llc_sap_state_ev *ev = llc_sap_ev(skb); |
136 | int rc; |
137 | |
138 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ssap: ev->saddr.lsap, |
139 | dsap: ev->daddr.lsap, LLC_PDU_CMD); |
140 | llc_pdu_init_as_test_cmd(skb); |
141 | rc = llc_mac_hdr_init(skb, sa: ev->saddr.mac, da: ev->daddr.mac); |
142 | if (likely(!rc)) { |
143 | skb_get(skb); |
144 | rc = dev_queue_xmit(skb); |
145 | } |
146 | return rc; |
147 | } |
148 | |
149 | int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb) |
150 | { |
151 | u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap; |
152 | struct sk_buff *nskb; |
153 | int rc = 1; |
154 | u32 data_size; |
155 | |
156 | llc_pdu_decode_sa(skb, sa: mac_da); |
157 | llc_pdu_decode_da(skb, da: mac_sa); |
158 | llc_pdu_decode_ssap(skb, ssap: &dsap); |
159 | |
160 | /* The test request command is type U (llc_len = 3) */ |
161 | data_size = ntohs(eth_hdr(skb)->h_proto) - 3; |
162 | nskb = llc_alloc_frame(NULL, dev: skb->dev, LLC_PDU_TYPE_U, data_size); |
163 | if (!nskb) |
164 | goto out; |
165 | llc_pdu_header_init(skb: nskb, LLC_PDU_TYPE_U, ssap: sap->laddr.lsap, dsap, |
166 | LLC_PDU_RSP); |
167 | llc_pdu_init_as_test_rsp(skb: nskb, ev_skb: skb); |
168 | rc = llc_mac_hdr_init(skb: nskb, sa: mac_sa, da: mac_da); |
169 | if (likely(!rc)) |
170 | rc = dev_queue_xmit(skb: nskb); |
171 | out: |
172 | return rc; |
173 | } |
174 | |
175 | /** |
176 | * llc_sap_action_report_status - report data link status to layer mgmt |
177 | * @sap: SAP |
178 | * @skb: the event to send |
179 | * |
180 | * Report data link status to layer management. Verify our event is the |
181 | * kind we expect. |
182 | */ |
183 | int llc_sap_action_report_status(struct llc_sap *sap, struct sk_buff *skb) |
184 | { |
185 | return 0; |
186 | } |
187 | |
188 | /** |
189 | * llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND |
190 | * @sap: SAP |
191 | * @skb: the event to send |
192 | * |
193 | * Send a XID response PDU to the network layer via a XID INDICATION |
194 | * primitive. |
195 | */ |
196 | int llc_sap_action_xid_ind(struct llc_sap *sap, struct sk_buff *skb) |
197 | { |
198 | llc_sap_rtn_pdu(sap, skb); |
199 | return 0; |
200 | } |
201 | |
202 | /** |
203 | * llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND |
204 | * @sap: SAP |
205 | * @skb: the event to send |
206 | * |
207 | * Send a TEST response PDU to the network layer via a TEST INDICATION |
208 | * primitive. Verify our event is a PDU type event. |
209 | */ |
210 | int llc_sap_action_test_ind(struct llc_sap *sap, struct sk_buff *skb) |
211 | { |
212 | llc_sap_rtn_pdu(sap, skb); |
213 | return 0; |
214 | } |
215 | |