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 */
  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}
 209
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