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Linux/net/llc/llc_s_ac.c

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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  */
 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);
 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  */
 75 int 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  */
 97 int 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);
116 out:
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  */
129 int 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 
143 int 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);
165 out:
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  */
177 int 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  */
190 int 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  */
204 int 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 }
209 

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