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1da177e4 LT |
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> | |
f4ad2b16 | 27 | |
1da177e4 LT |
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 | */ | |
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, 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); | |
929d6a32 EB |
61 | if (likely(!rc)) { |
62 | skb_get(skb); | |
1da177e4 | 63 | rc = dev_queue_xmit(skb); |
929d6a32 | 64 | } |
1da177e4 LT |
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, ev->saddr.lsap, | |
83 | ev->daddr.lsap, LLC_PDU_CMD); | |
84 | llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 0); | |
85 | rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac); | |
929d6a32 EB |
86 | if (likely(!rc)) { |
87 | skb_get(skb); | |
1da177e4 | 88 | rc = dev_queue_xmit(skb); |
929d6a32 | 89 | } |
1da177e4 LT |
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, mac_da); | |
108 | llc_pdu_decode_da(skb, mac_sa); | |
109 | llc_pdu_decode_ssap(skb, &dsap); | |
f83f1768 JP |
110 | nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, |
111 | sizeof(struct llc_xid_info)); | |
1da177e4 LT |
112 | if (!nskb) |
113 | goto out; | |
1da177e4 LT |
114 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap, |
115 | LLC_PDU_RSP); | |
116 | llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0); | |
117 | rc = llc_mac_hdr_init(nskb, mac_sa, mac_da); | |
249ff1c6 | 118 | if (likely(!rc)) |
1da177e4 LT |
119 | rc = dev_queue_xmit(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, ev->saddr.lsap, | |
139 | ev->daddr.lsap, LLC_PDU_CMD); | |
140 | llc_pdu_init_as_test_cmd(skb); | |
141 | rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac); | |
929d6a32 EB |
142 | if (likely(!rc)) { |
143 | skb_get(skb); | |
1da177e4 | 144 | rc = dev_queue_xmit(skb); |
929d6a32 | 145 | } |
1da177e4 LT |
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; | |
f83f1768 | 154 | u32 data_size; |
1da177e4 LT |
155 | |
156 | llc_pdu_decode_sa(skb, mac_da); | |
157 | llc_pdu_decode_da(skb, mac_sa); | |
158 | llc_pdu_decode_ssap(skb, &dsap); | |
f83f1768 JP |
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, skb->dev, LLC_PDU_TYPE_U, data_size); | |
1da177e4 LT |
163 | if (!nskb) |
164 | goto out; | |
1da177e4 LT |
165 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap, |
166 | LLC_PDU_RSP); | |
167 | llc_pdu_init_as_test_rsp(nskb, skb); | |
168 | rc = llc_mac_hdr_init(nskb, mac_sa, mac_da); | |
249ff1c6 | 169 | if (likely(!rc)) |
1da177e4 LT |
170 | rc = dev_queue_xmit(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 | } |