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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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#include "llc_output.h"
28
29/**
30 * llc_sap_action_unit_data_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 */
37int 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 */
52int 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, ev->saddr.lsap,
58 ev->daddr.lsap, LLC_PDU_CMD);
59 llc_pdu_init_as_ui_cmd(skb);
60 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
61 if (!rc)
62 rc = dev_queue_xmit(skb);
63 return rc;
64}
65
66/**
67 * llc_sap_action_send_xid_c - send XID PDU as response to XID REQ
68 * @sap: SAP
69 * @skb: the event to send
70 *
71 * Send a XID command PDU to MAC layer in response to a XID REQUEST
72 * primitive from the network layer. Verify event is a primitive type
73 * event. Verify the primitive is a XID REQUEST.
74 */
75int llc_sap_action_send_xid_c(struct llc_sap *sap, struct sk_buff *skb)
76{
77 struct llc_sap_state_ev *ev = llc_sap_ev(skb);
78 int rc;
79
80 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap,
81 ev->daddr.lsap, LLC_PDU_CMD);
82 llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 0);
83 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
84 if (!rc)
85 rc = dev_queue_xmit(skb);
86 return rc;
87}
88
89/**
90 * llc_sap_action_send_xid_r - send XID PDU resp to MAC for received XID
91 * @sap: SAP
92 * @skb: the event to send
93 *
94 * Send XID response PDU to MAC in response to an earlier received XID
95 * command PDU. Verify event is a PDU type event
96 */
97int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb)
98{
99 u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
100 int rc = 1;
101 struct sk_buff *nskb;
102
103 llc_pdu_decode_sa(skb, mac_da);
104 llc_pdu_decode_da(skb, mac_sa);
105 llc_pdu_decode_ssap(skb, &dsap);
106 nskb = llc_alloc_frame();
107 if (!nskb)
108 goto out;
109 nskb->dev = skb->dev;
110 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
111 LLC_PDU_RSP);
112 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0);
113 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
114 if (!rc)
115 rc = dev_queue_xmit(nskb);
116out:
117 return rc;
118}
119
120/**
121 * llc_sap_action_send_test_c - send TEST PDU to MAC in resp to TEST REQ
122 * @sap: SAP
123 * @skb: the event to send
124 *
125 * Send a TEST command PDU to the MAC layer in response to a TEST REQUEST
126 * primitive from the network layer. Verify event is a primitive type
127 * event; verify the primitive is a TEST REQUEST.
128 */
129int llc_sap_action_send_test_c(struct llc_sap *sap, struct sk_buff *skb)
130{
131 struct llc_sap_state_ev *ev = llc_sap_ev(skb);
132 int rc;
133
134 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap,
135 ev->daddr.lsap, LLC_PDU_CMD);
136 llc_pdu_init_as_test_cmd(skb);
137 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
138 if (!rc)
139 rc = dev_queue_xmit(skb);
140 return rc;
141}
142
143int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb)
144{
145 u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
146 struct sk_buff *nskb;
147 int rc = 1;
148
149 llc_pdu_decode_sa(skb, mac_da);
150 llc_pdu_decode_da(skb, mac_sa);
151 llc_pdu_decode_ssap(skb, &dsap);
152 nskb = llc_alloc_frame();
153 if (!nskb)
154 goto out;
155 nskb->dev = skb->dev;
156 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
157 LLC_PDU_RSP);
158 llc_pdu_init_as_test_rsp(nskb, skb);
159 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
160 if (!rc)
161 rc = dev_queue_xmit(nskb);
162out:
163 return rc;
164}
165
166/**
167 * llc_sap_action_report_status - report data link status to layer mgmt
168 * @sap: SAP
169 * @skb: the event to send
170 *
171 * Report data link status to layer management. Verify our event is the
172 * kind we expect.
173 */
174int llc_sap_action_report_status(struct llc_sap *sap, struct sk_buff *skb)
175{
176 return 0;
177}
178
179/**
180 * llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND
181 * @sap: SAP
182 * @skb: the event to send
183 *
184 * Send a XID response PDU to the network layer via a XID INDICATION
185 * primitive.
186 */
187int llc_sap_action_xid_ind(struct llc_sap *sap, struct sk_buff *skb)
188{
189 llc_sap_rtn_pdu(sap, skb);
190 return 0;
191}
192
193/**
194 * llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND
195 * @sap: SAP
196 * @skb: the event to send
197 *
198 * Send a TEST response PDU to the network layer via a TEST INDICATION
199 * primitive. Verify our event is a PDU type event.
200 */
201int llc_sap_action_test_ind(struct llc_sap *sap, struct sk_buff *skb)
202{
203 llc_sap_rtn_pdu(sap, skb);
204 return 0;
205}