438 lines
14 KiB
C
438 lines
14 KiB
C
#ifndef LLC_PDU_H
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#define LLC_PDU_H
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/*
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* Copyright (c) 1997 by Procom Technology,Inc.
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* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program can be redistributed or modified under the terms of the
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* GNU General Public License as published by the Free Software Foundation.
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* This program is distributed without any warranty or implied warranty
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* of merchantability or fitness for a particular purpose.
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*
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* See the GNU General Public License for more details.
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*/
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#include <linux/if_ether.h>
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#include <linux/if_tr.h>
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/* Lengths of frame formats */
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#define LLC_PDU_LEN_I 4 /* header and 2 control bytes */
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#define LLC_PDU_LEN_S 4
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#define LLC_PDU_LEN_U 3 /* header and 1 control byte */
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/* Known SAP addresses */
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#define LLC_GLOBAL_SAP 0xFF
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#define LLC_NULL_SAP 0x00 /* not network-layer visible */
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#define LLC_MGMT_INDIV 0x02 /* station LLC mgmt indiv addr */
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#define LLC_MGMT_GRP 0x03 /* station LLC mgmt group addr */
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#define LLC_RDE_SAP 0xA6 /* route ... */
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/* SAP field bit masks */
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#define LLC_ISO_RESERVED_SAP 0x02
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#define LLC_SAP_GROUP_DSAP 0x01
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#define LLC_SAP_RESP_SSAP 0x01
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/* Group/individual DSAP indicator is DSAP field */
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#define LLC_PDU_GROUP_DSAP_MASK 0x01
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#define LLC_PDU_IS_GROUP_DSAP(pdu) \
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((pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
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#define LLC_PDU_IS_INDIV_DSAP(pdu) \
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(!(pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
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/* Command/response PDU indicator in SSAP field */
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#define LLC_PDU_CMD_RSP_MASK 0x01
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#define LLC_PDU_CMD 0
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#define LLC_PDU_RSP 1
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#define LLC_PDU_IS_CMD(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 0 : 1)
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#define LLC_PDU_IS_RSP(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 1 : 0)
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/* Get PDU type from 2 lowest-order bits of control field first byte */
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#define LLC_PDU_TYPE_I_MASK 0x01 /* 16-bit control field */
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#define LLC_PDU_TYPE_S_MASK 0x03
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#define LLC_PDU_TYPE_U_MASK 0x03 /* 8-bit control field */
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#define LLC_PDU_TYPE_MASK 0x03
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#define LLC_PDU_TYPE_I 0 /* first bit */
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#define LLC_PDU_TYPE_S 1 /* first two bits */
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#define LLC_PDU_TYPE_U 3 /* first two bits */
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#define LLC_PDU_TYPE_IS_I(pdu) \
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((!(pdu->ctrl_1 & LLC_PDU_TYPE_I_MASK)) ? 1 : 0)
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#define LLC_PDU_TYPE_IS_U(pdu) \
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(((pdu->ctrl_1 & LLC_PDU_TYPE_U_MASK) == LLC_PDU_TYPE_U) ? 1 : 0)
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#define LLC_PDU_TYPE_IS_S(pdu) \
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(((pdu->ctrl_1 & LLC_PDU_TYPE_S_MASK) == LLC_PDU_TYPE_S) ? 1 : 0)
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/* U-format PDU control field masks */
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#define LLC_U_PF_BIT_MASK 0x10 /* P/F bit mask */
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#define LLC_U_PF_IS_1(pdu) ((pdu->ctrl_1 & LLC_U_PF_BIT_MASK) ? 1 : 0)
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#define LLC_U_PF_IS_0(pdu) ((!(pdu->ctrl_1 & LLC_U_PF_BIT_MASK)) ? 1 : 0)
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#define LLC_U_PDU_CMD_MASK 0xEC /* cmd/rsp mask */
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#define LLC_U_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
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#define LLC_U_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
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#define LLC_1_PDU_CMD_UI 0x00 /* Type 1 cmds/rsps */
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#define LLC_1_PDU_CMD_XID 0xAC
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#define LLC_1_PDU_CMD_TEST 0xE0
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#define LLC_2_PDU_CMD_SABME 0x6C /* Type 2 cmds/rsps */
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#define LLC_2_PDU_CMD_DISC 0x40
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#define LLC_2_PDU_RSP_UA 0x60
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#define LLC_2_PDU_RSP_DM 0x0C
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#define LLC_2_PDU_RSP_FRMR 0x84
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/* Type 1 operations */
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/* XID information field bit masks */
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/* LLC format identifier (byte 1) */
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#define LLC_XID_FMT_ID 0x81 /* first byte must be this */
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/* LLC types/classes identifier (byte 2) */
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#define LLC_XID_CLASS_ZEROS_MASK 0xE0 /* these must be zeros */
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#define LLC_XID_CLASS_MASK 0x1F /* AND with byte to get below */
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#define LLC_XID_NULL_CLASS_1 0x01 /* if NULL LSAP...use these */
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#define LLC_XID_NULL_CLASS_2 0x03
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#define LLC_XID_NULL_CLASS_3 0x05
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#define LLC_XID_NULL_CLASS_4 0x07
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#define LLC_XID_NNULL_TYPE_1 0x01 /* if non-NULL LSAP...use these */
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#define LLC_XID_NNULL_TYPE_2 0x02
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#define LLC_XID_NNULL_TYPE_3 0x04
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#define LLC_XID_NNULL_TYPE_1_2 0x03
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#define LLC_XID_NNULL_TYPE_1_3 0x05
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#define LLC_XID_NNULL_TYPE_2_3 0x06
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#define LLC_XID_NNULL_ALL 0x07
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/* Sender Receive Window (byte 3) */
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#define LLC_XID_RW_MASK 0xFE /* AND with value to get below */
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#define LLC_XID_MIN_RW 0x02 /* lowest-order bit always zero */
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/* Type 2 operations */
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#define LLC_2_SEQ_NBR_MODULO ((u8) 128)
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/* I-PDU masks ('ctrl' is I-PDU control word) */
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#define LLC_I_GET_NS(pdu) (u8)((pdu->ctrl_1 & 0xFE) >> 1)
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#define LLC_I_GET_NR(pdu) (u8)((pdu->ctrl_2 & 0xFE) >> 1)
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#define LLC_I_PF_BIT_MASK 0x01
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#define LLC_I_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_I_PF_BIT_MASK)) ? 1 : 0)
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#define LLC_I_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_I_PF_BIT_MASK) ? 1 : 0)
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/* S-PDU supervisory commands and responses */
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#define LLC_S_PDU_CMD_MASK 0x0C
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#define LLC_S_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
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#define LLC_S_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
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#define LLC_2_PDU_CMD_RR 0x00 /* rx ready cmd */
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#define LLC_2_PDU_RSP_RR 0x00 /* rx ready rsp */
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#define LLC_2_PDU_CMD_REJ 0x08 /* reject PDU cmd */
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#define LLC_2_PDU_RSP_REJ 0x08 /* reject PDU rsp */
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#define LLC_2_PDU_CMD_RNR 0x04 /* rx not ready cmd */
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#define LLC_2_PDU_RSP_RNR 0x04 /* rx not ready rsp */
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#define LLC_S_PF_BIT_MASK 0x01
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#define LLC_S_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_S_PF_BIT_MASK)) ? 1 : 0)
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#define LLC_S_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_S_PF_BIT_MASK) ? 1 : 0)
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#define PDU_SUPV_GET_Nr(pdu) ((pdu->ctrl_2 & 0xFE) >> 1)
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#define PDU_GET_NEXT_Vr(sn) (++sn & ~LLC_2_SEQ_NBR_MODULO)
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/* FRMR information field macros */
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#define FRMR_INFO_LENGTH 5 /* 5 bytes of information */
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/*
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* info is pointer to FRMR info field structure; 'rej_ctrl' is byte pointer
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* (if U-PDU) or word pointer to rejected PDU control field
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*/
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#define FRMR_INFO_SET_REJ_CNTRL(info,rej_ctrl) \
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info->rej_pdu_ctrl = ((*((u8 *) rej_ctrl) & \
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LLC_PDU_TYPE_U) != LLC_PDU_TYPE_U ? \
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(u16)*((u16 *) rej_ctrl) : \
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(((u16) *((u8 *) rej_ctrl)) & 0x00FF))
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/*
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* Info is pointer to FRMR info field structure; 'vs' is a byte containing
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* send state variable value in low-order 7 bits (insure the lowest-order
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* bit remains zero (0))
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*/
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#define FRMR_INFO_SET_Vs(info,vs) (info->curr_ssv = (((u8) vs) << 1))
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#define FRMR_INFO_SET_Vr(info,vr) (info->curr_rsv = (((u8) vr) << 1))
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/*
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* Info is pointer to FRMR info field structure; 'cr' is a byte containing
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* the C/R bit value in the low-order bit
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*/
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#define FRMR_INFO_SET_C_R_BIT(info, cr) (info->curr_rsv |= (((u8) cr) & 0x01))
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/*
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* In the remaining five macros, 'info' is pointer to FRMR info field
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* structure; 'ind' is a byte containing the bit value to set in the
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* lowest-order bit)
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*/
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#define FRMR_INFO_SET_INVALID_PDU_CTRL_IND(info, ind) \
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(info->ind_bits = ((info->ind_bits & 0xFE) | (((u8) ind) & 0x01)))
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#define FRMR_INFO_SET_INVALID_PDU_INFO_IND(info, ind) \
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(info->ind_bits = ( (info->ind_bits & 0xFD) | (((u8) ind) & 0x02)))
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#define FRMR_INFO_SET_PDU_INFO_2LONG_IND(info, ind) \
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(info->ind_bits = ( (info->ind_bits & 0xFB) | (((u8) ind) & 0x04)))
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#define FRMR_INFO_SET_PDU_INVALID_Nr_IND(info, ind) \
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(info->ind_bits = ( (info->ind_bits & 0xF7) | (((u8) ind) & 0x08)))
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#define FRMR_INFO_SET_PDU_INVALID_Ns_IND(info, ind) \
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(info->ind_bits = ( (info->ind_bits & 0xEF) | (((u8) ind) & 0x10)))
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/* Sequence-numbered PDU format (4 bytes in length) */
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struct llc_pdu_sn {
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u8 dsap;
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u8 ssap;
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u8 ctrl_1;
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u8 ctrl_2;
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};
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static inline struct llc_pdu_sn *llc_pdu_sn_hdr(struct sk_buff *skb)
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{
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return (struct llc_pdu_sn *)skb_network_header(skb);
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}
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/* Un-numbered PDU format (3 bytes in length) */
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struct llc_pdu_un {
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u8 dsap;
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u8 ssap;
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u8 ctrl_1;
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};
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static inline struct llc_pdu_un *llc_pdu_un_hdr(struct sk_buff *skb)
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{
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return (struct llc_pdu_un *)skb_network_header(skb);
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}
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/**
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* llc_pdu_header_init - initializes pdu header
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* @skb: input skb that header must be set into it.
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* @type: type of PDU (U, I or S).
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* @ssap: source sap.
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* @dsap: destination sap.
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* @cr: command/response bit (0 or 1).
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*
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* This function sets DSAP, SSAP and command/Response bit in LLC header.
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*/
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static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type,
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u8 ssap, u8 dsap, u8 cr)
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{
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const int hlen = type == LLC_PDU_TYPE_U ? 3 : 4;
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struct llc_pdu_un *pdu;
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skb_push(skb, hlen);
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skb_reset_network_header(skb);
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pdu = llc_pdu_un_hdr(skb);
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pdu->dsap = dsap;
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pdu->ssap = ssap;
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pdu->ssap |= cr;
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}
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/**
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* llc_pdu_decode_sa - extracs source address (MAC) of input frame
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* @skb: input skb that source address must be extracted from it.
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* @sa: pointer to source address (6 byte array).
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*
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* This function extracts source address(MAC) of input frame.
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*/
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static inline void llc_pdu_decode_sa(struct sk_buff *skb, u8 *sa)
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{
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if (skb->protocol == htons(ETH_P_802_2))
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memcpy(sa, eth_hdr(skb)->h_source, ETH_ALEN);
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else if (skb->protocol == htons(ETH_P_TR_802_2)) {
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memcpy(sa, tr_hdr(skb)->saddr, ETH_ALEN);
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*sa &= 0x7F;
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}
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}
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/**
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* llc_pdu_decode_da - extracts dest address of input frame
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* @skb: input skb that destination address must be extracted from it
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* @sa: pointer to destination address (6 byte array).
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*
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* This function extracts destination address(MAC) of input frame.
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*/
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static inline void llc_pdu_decode_da(struct sk_buff *skb, u8 *da)
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{
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if (skb->protocol == htons(ETH_P_802_2))
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memcpy(da, eth_hdr(skb)->h_dest, ETH_ALEN);
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else if (skb->protocol == htons(ETH_P_TR_802_2))
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memcpy(da, tr_hdr(skb)->daddr, ETH_ALEN);
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}
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/**
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* llc_pdu_decode_ssap - extracts source SAP of input frame
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* @skb: input skb that source SAP must be extracted from it.
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* @ssap: source SAP (output argument).
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*
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* This function extracts source SAP of input frame. Right bit of SSAP is
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* command/response bit.
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*/
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static inline void llc_pdu_decode_ssap(struct sk_buff *skb, u8 *ssap)
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{
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*ssap = llc_pdu_un_hdr(skb)->ssap & 0xFE;
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}
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/**
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* llc_pdu_decode_dsap - extracts dest SAP of input frame
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* @skb: input skb that destination SAP must be extracted from it.
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* @dsap: destination SAP (output argument).
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*
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* This function extracts destination SAP of input frame. right bit of
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* DSAP designates individual/group SAP.
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*/
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static inline void llc_pdu_decode_dsap(struct sk_buff *skb, u8 *dsap)
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{
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*dsap = llc_pdu_un_hdr(skb)->dsap & 0xFE;
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}
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/**
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* llc_pdu_init_as_ui_cmd - sets LLC header as UI PDU
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* @skb: input skb that header must be set into it.
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*
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* This function sets third byte of LLC header as a UI PDU.
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*/
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static inline void llc_pdu_init_as_ui_cmd(struct sk_buff *skb)
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{
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
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pdu->ctrl_1 = LLC_PDU_TYPE_U;
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pdu->ctrl_1 |= LLC_1_PDU_CMD_UI;
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}
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/**
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* llc_pdu_init_as_test_cmd - sets PDU as TEST
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* @skb - Address of the skb to build
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*
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* Sets a PDU as TEST
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*/
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static inline void llc_pdu_init_as_test_cmd(struct sk_buff *skb)
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{
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
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pdu->ctrl_1 = LLC_PDU_TYPE_U;
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pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;
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pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
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}
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/**
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* llc_pdu_init_as_test_rsp - build TEST response PDU
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* @skb: Address of the skb to build
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* @ev_skb: The received TEST command PDU frame
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*
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* Builds a pdu frame as a TEST response.
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*/
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static inline void llc_pdu_init_as_test_rsp(struct sk_buff *skb,
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struct sk_buff *ev_skb)
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{
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
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pdu->ctrl_1 = LLC_PDU_TYPE_U;
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pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;
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pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
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if (ev_skb->protocol == htons(ETH_P_802_2)) {
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struct llc_pdu_un *ev_pdu = llc_pdu_un_hdr(ev_skb);
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int dsize;
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dsize = ntohs(eth_hdr(ev_skb)->h_proto) - 3;
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memcpy(((u8 *)pdu) + 3, ((u8 *)ev_pdu) + 3, dsize);
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skb_put(skb, dsize);
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}
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}
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/* LLC Type 1 XID command/response information fields format */
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struct llc_xid_info {
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u8 fmt_id; /* always 0x81 for LLC */
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u8 type; /* different if NULL/non-NULL LSAP */
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u8 rw; /* sender receive window */
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};
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/**
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* llc_pdu_init_as_xid_cmd - sets bytes 3, 4 & 5 of LLC header as XID
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* @skb: input skb that header must be set into it.
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*
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* This function sets third,fourth,fifth and sixth bytes of LLC header as
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* a XID PDU.
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*/
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static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb,
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u8 svcs_supported, u8 rx_window)
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{
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struct llc_xid_info *xid_info;
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
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pdu->ctrl_1 = LLC_PDU_TYPE_U;
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pdu->ctrl_1 |= LLC_1_PDU_CMD_XID;
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pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
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xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);
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xid_info->fmt_id = LLC_XID_FMT_ID; /* 0x81 */
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xid_info->type = svcs_supported;
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xid_info->rw = rx_window << 1; /* size of receive window */
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skb_put(skb, 3);
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}
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/**
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* llc_pdu_init_as_xid_rsp - builds XID response PDU
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* @skb: Address of the skb to build
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* @svcs_supported: The class of the LLC (I or II)
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* @rx_window: The size of the receive window of the LLC
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*
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* Builds a pdu frame as an XID response.
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*/
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static inline void llc_pdu_init_as_xid_rsp(struct sk_buff *skb,
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u8 svcs_supported, u8 rx_window)
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{
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struct llc_xid_info *xid_info;
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
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pdu->ctrl_1 = LLC_PDU_TYPE_U;
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pdu->ctrl_1 |= LLC_1_PDU_CMD_XID;
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pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
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xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);
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xid_info->fmt_id = LLC_XID_FMT_ID;
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xid_info->type = svcs_supported;
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xid_info->rw = rx_window << 1;
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skb_put(skb, 3);
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}
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/* LLC Type 2 FRMR response information field format */
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struct llc_frmr_info {
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u16 rej_pdu_ctrl; /* bits 1-8 if U-PDU */
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u8 curr_ssv; /* current send state variable val */
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u8 curr_rsv; /* current receive state variable */
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u8 ind_bits; /* indicator bits set with macro */
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};
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extern void llc_pdu_set_cmd_rsp(struct sk_buff *skb, u8 type);
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extern void llc_pdu_set_pf_bit(struct sk_buff *skb, u8 bit_value);
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extern void llc_pdu_decode_pf_bit(struct sk_buff *skb, u8 *pf_bit);
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extern void llc_pdu_init_as_disc_cmd(struct sk_buff *skb, u8 p_bit);
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extern void llc_pdu_init_as_i_cmd(struct sk_buff *skb, u8 p_bit, u8 ns, u8 nr);
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extern void llc_pdu_init_as_rej_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
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extern void llc_pdu_init_as_rnr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
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extern void llc_pdu_init_as_rr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
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extern void llc_pdu_init_as_sabme_cmd(struct sk_buff *skb, u8 p_bit);
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extern void llc_pdu_init_as_dm_rsp(struct sk_buff *skb, u8 f_bit);
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extern void llc_pdu_init_as_frmr_rsp(struct sk_buff *skb,
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struct llc_pdu_sn *prev_pdu,
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u8 f_bit, u8 vs, u8 vr, u8 vzyxw);
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extern void llc_pdu_init_as_rr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
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extern void llc_pdu_init_as_rej_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
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extern void llc_pdu_init_as_rnr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
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extern void llc_pdu_init_as_ua_rsp(struct sk_buff *skb, u8 f_bit);
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#endif /* LLC_PDU_H */
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