LXR linux/net/llc/llc_s

   1/*
   2 * llc_s_ev.c - Defines SAP component events
   3 *
   4 * The followed event functions are SAP component events which are described
   5 * in 802.2 LLC protocol standard document.
   6 *
   7 * Copyright (c) 1997 by Procom Technology, Inc.
   8 *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   9 *
  10 * This program can be redistributed or modified under the terms of the
  11 * GNU General Public License as published by the Free Software Foundation.
  12 * This program is distributed without any warranty or implied warranty
  13 * of merchantability or fitness for a particular purpose.
  14 *
  15 * See the GNU General Public License for more details.
  16 */
  17#include <linux/socket.h>
  18#include <net/sock.h>
  19#include <net/llc_if.h>
  20#include <net/llc_s_ev.h>
  21#include <net/llc_pdu.h>
  22
  23int llc_sap_ev_activation_req(struct llc_sap *sap, struct sk_buff *skb)
  24{
  25        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  26
  27        return ev->type == LLC_SAP_EV_TYPE_SIMPLE &&
  28               ev->prim_type == LLC_SAP_EV_ACTIVATION_REQ ? 0 : 1;
  29}
  30
  31int llc_sap_ev_rx_ui(struct llc_sap *sap, struct sk_buff *skb)
  32{
  33        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  34        struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  35
  36        return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
  37               LLC_PDU_TYPE_IS_U(pdu) &&
  38               LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_UI ? 0 : 1;
  39}
  40
  41int llc_sap_ev_unitdata_req(struct llc_sap *sap, struct sk_buff *skb)
  42{
  43        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  44
  45        return ev->type == LLC_SAP_EV_TYPE_PRIM &&
  46               ev->prim == LLC_DATAUNIT_PRIM &&
  47               ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
  48
  49}
  50
  51int llc_sap_ev_xid_req(struct llc_sap *sap, struct sk_buff *skb)
  52{
  53        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  54
  55        return ev->type == LLC_SAP_EV_TYPE_PRIM &&
  56               ev->prim == LLC_XID_PRIM &&
  57               ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
  58}
  59
  60int llc_sap_ev_rx_xid_c(struct llc_sap *sap, struct sk_buff *skb)
  61{
  62        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  63        struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  64
  65        return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
  66               LLC_PDU_TYPE_IS_U(pdu) &&
  67               LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID ? 0 : 1;
  68}
  69
  70int llc_sap_ev_rx_xid_r(struct llc_sap *sap, struct sk_buff *skb)
  71{
  72        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  73        struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  74
  75        return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_RSP(pdu) &&
  76               LLC_PDU_TYPE_IS_U(pdu) &&
  77               LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID ? 0 : 1;
  78}
  79
  80int llc_sap_ev_test_req(struct llc_sap *sap, struct sk_buff *skb)
  81{
  82        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  83
  84        return ev->type == LLC_SAP_EV_TYPE_PRIM &&
  85               ev->prim == LLC_TEST_PRIM &&
  86               ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
  87}
  88
  89int llc_sap_ev_rx_test_c(struct llc_sap *sap, struct sk_buff *skb)
  90{
  91        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  92        struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  93
  94        return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
  95               LLC_PDU_TYPE_IS_U(pdu) &&
  96               LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
  97}
  98
  99int llc_sap_ev_rx_test_r(struct llc_sap *sap, struct sk_buff *skb)
 100{
 101        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
 102        struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 103
 104        return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_RSP(pdu) &&
 105               LLC_PDU_TYPE_IS_U(pdu) &&
 106               LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
 107}
 108
 109int llc_sap_ev_deactivation_req(struct llc_sap *sap, struct sk_buff *skb)
 110{
 111        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
 112
 113        return ev->type == LLC_SAP_EV_TYPE_SIMPLE &&
 114               ev->prim_type == LLC_SAP_EV_DEACTIVATION_REQ ? 0 : 1;
 115}
 116