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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_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 (likely(!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 (likely(!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(NULL, skb->dev, LLC_PDU_TYPE_U,
107 sizeof(struct llc_xid_info));
108 if (!nskb)
109 goto out;
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 (likely(!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 (likely(!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 u32 data_size;
149
150 llc_pdu_decode_sa(skb, mac_da);
151 llc_pdu_decode_da(skb, mac_sa);
152 llc_pdu_decode_ssap(skb, &dsap);
153
154 /* The test request command is type U (llc_len = 3) */
155 data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
156 nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
157 if (!nskb)
158 goto out;
159 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
160 LLC_PDU_RSP);
161 llc_pdu_init_as_test_rsp(nskb, skb);
162 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
163 if (likely(!rc))
164 rc = dev_queue_xmit(nskb);
165out:
166 return rc;
167}
168
169/**
170 * llc_sap_action_report_status - report data link status to layer mgmt
171 * @sap: SAP
172 * @skb: the event to send
173 *
174 * Report data link status to layer management. Verify our event is the
175 * kind we expect.
176 */
177int llc_sap_action_report_status(struct llc_sap *sap, struct sk_buff *skb)
178{
179 return 0;
180}
181
182/**
183 * llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND
184 * @sap: SAP
185 * @skb: the event to send
186 *
187 * Send a XID response PDU to the network layer via a XID INDICATION
188 * primitive.
189 */
190int llc_sap_action_xid_ind(struct llc_sap *sap, struct sk_buff *skb)
191{
192 llc_sap_rtn_pdu(sap, skb);
193 return 0;
194}
195
196/**
197 * llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND
198 * @sap: SAP
199 * @skb: the event to send
200 *
201 * Send a TEST response PDU to the network layer via a TEST INDICATION
202 * primitive. Verify our event is a PDU type event.
203 */
204int llc_sap_action_test_ind(struct llc_sap *sap, struct sk_buff *skb)
205{
206 llc_sap_rtn_pdu(sap, skb);
207 return 0;
208}
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#include <net/sock.h>
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 */
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
43static int llc_prepare_and_xmit(struct sk_buff *skb)
44{
45 struct llc_sap_state_ev *ev = llc_sap_ev(skb);
46 struct sk_buff *nskb;
47 int rc;
48
49 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
50 if (rc)
51 return rc;
52
53 nskb = skb_clone(skb, GFP_ATOMIC);
54 if (!nskb)
55 return -ENOMEM;
56
57 if (skb->sk)
58 skb_set_owner_w(nskb, skb->sk);
59
60 return dev_queue_xmit(nskb);
61}
62
63/**
64 * llc_sap_action_send_ui - sends UI PDU resp to UNITDATA REQ to MAC layer
65 * @sap: SAP
66 * @skb: the event to send
67 *
68 * Sends a UI PDU to the MAC layer in response to a UNITDATA REQUEST
69 * primitive from the network layer. Verifies event is a primitive type of
70 * event. Verify the primitive is a UNITDATA REQUEST.
71 */
72int llc_sap_action_send_ui(struct llc_sap *sap, struct sk_buff *skb)
73{
74 struct llc_sap_state_ev *ev = llc_sap_ev(skb);
75
76 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap,
77 ev->daddr.lsap, LLC_PDU_CMD);
78 llc_pdu_init_as_ui_cmd(skb);
79
80 return llc_prepare_and_xmit(skb);
81}
82
83/**
84 * llc_sap_action_send_xid_c - send XID PDU as response to XID REQ
85 * @sap: SAP
86 * @skb: the event to send
87 *
88 * Send a XID command PDU to MAC layer in response to a XID REQUEST
89 * primitive from the network layer. Verify event is a primitive type
90 * event. Verify the primitive is a XID REQUEST.
91 */
92int llc_sap_action_send_xid_c(struct llc_sap *sap, struct sk_buff *skb)
93{
94 struct llc_sap_state_ev *ev = llc_sap_ev(skb);
95
96 llc_pdu_header_init(skb, LLC_PDU_TYPE_U_XID, ev->saddr.lsap,
97 ev->daddr.lsap, LLC_PDU_CMD);
98 llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 0);
99
100 return llc_prepare_and_xmit(skb);
101}
102
103/**
104 * llc_sap_action_send_xid_r - send XID PDU resp to MAC for received XID
105 * @sap: SAP
106 * @skb: the event to send
107 *
108 * Send XID response PDU to MAC in response to an earlier received XID
109 * command PDU. Verify event is a PDU type event
110 */
111int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb)
112{
113 u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
114 int rc = 1;
115 struct sk_buff *nskb;
116
117 llc_pdu_decode_sa(skb, mac_da);
118 llc_pdu_decode_da(skb, mac_sa);
119 llc_pdu_decode_ssap(skb, &dsap);
120 nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
121 sizeof(struct llc_xid_info));
122 if (!nskb)
123 goto out;
124 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
125 LLC_PDU_RSP);
126 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0);
127 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
128 if (likely(!rc))
129 rc = dev_queue_xmit(nskb);
130out:
131 return rc;
132}
133
134/**
135 * llc_sap_action_send_test_c - send TEST PDU to MAC in resp to TEST REQ
136 * @sap: SAP
137 * @skb: the event to send
138 *
139 * Send a TEST command PDU to the MAC layer in response to a TEST REQUEST
140 * primitive from the network layer. Verify event is a primitive type
141 * event; verify the primitive is a TEST REQUEST.
142 */
143int llc_sap_action_send_test_c(struct llc_sap *sap, struct sk_buff *skb)
144{
145 struct llc_sap_state_ev *ev = llc_sap_ev(skb);
146
147 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap,
148 ev->daddr.lsap, LLC_PDU_CMD);
149 llc_pdu_init_as_test_cmd(skb);
150
151 return llc_prepare_and_xmit(skb);
152}
153
154int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb)
155{
156 u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
157 struct sk_buff *nskb;
158 int rc = 1;
159 u32 data_size;
160
161 if (skb->mac_len < ETH_HLEN)
162 return 1;
163
164 llc_pdu_decode_sa(skb, mac_da);
165 llc_pdu_decode_da(skb, mac_sa);
166 llc_pdu_decode_ssap(skb, &dsap);
167
168 /* The test request command is type U (llc_len = 3) */
169 data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
170 nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
171 if (!nskb)
172 goto out;
173 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
174 LLC_PDU_RSP);
175 llc_pdu_init_as_test_rsp(nskb, skb);
176 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
177 if (likely(!rc))
178 rc = dev_queue_xmit(nskb);
179out:
180 return rc;
181}
182
183/**
184 * llc_sap_action_report_status - report data link status to layer mgmt
185 * @sap: SAP
186 * @skb: the event to send
187 *
188 * Report data link status to layer management. Verify our event is the
189 * kind we expect.
190 */
191int llc_sap_action_report_status(struct llc_sap *sap, struct sk_buff *skb)
192{
193 return 0;
194}
195
196/**
197 * llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND
198 * @sap: SAP
199 * @skb: the event to send
200 *
201 * Send a XID response PDU to the network layer via a XID INDICATION
202 * primitive.
203 */
204int llc_sap_action_xid_ind(struct llc_sap *sap, struct sk_buff *skb)
205{
206 llc_sap_rtn_pdu(sap, skb);
207 return 0;
208}
209
210/**
211 * llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND
212 * @sap: SAP
213 * @skb: the event to send
214 *
215 * Send a TEST response PDU to the network layer via a TEST INDICATION
216 * primitive. Verify our event is a PDU type event.
217 */
218int llc_sap_action_test_ind(struct llc_sap *sap, struct sk_buff *skb)
219{
220 llc_sap_rtn_pdu(sap, skb);
221 return 0;
222}