#ifndef LLC_PDU_H #define LLC_PDU_H /* * Copyright (c) 1997 by Procom Technology,Inc. * 2001-2003 by Arnaldo Carvalho de Melo <[email protected]> * * This program can be redistributed or modified under the terms of the * GNU General Public License as published by the Free Software Foundation. * This program is distributed without any warranty or implied warranty * of merchantability or fitness for a particular purpose. * * See the GNU General Public License for more details. */ #include <linux/if_ether.h> /* Lengths of frame formats */ #define LLC_PDU_LEN_I … #define LLC_PDU_LEN_S … #define LLC_PDU_LEN_U … /* header and 1 control byte and XID info */ #define LLC_PDU_LEN_U_XID … /* Known SAP addresses */ #define LLC_GLOBAL_SAP … #define LLC_NULL_SAP … #define LLC_MGMT_INDIV … #define LLC_MGMT_GRP … #define LLC_RDE_SAP … /* SAP field bit masks */ #define LLC_ISO_RESERVED_SAP … #define LLC_SAP_GROUP_DSAP … #define LLC_SAP_RESP_SSAP … /* Group/individual DSAP indicator is DSAP field */ #define LLC_PDU_GROUP_DSAP_MASK … #define LLC_PDU_IS_GROUP_DSAP(pdu) … #define LLC_PDU_IS_INDIV_DSAP(pdu) … /* Command/response PDU indicator in SSAP field */ #define LLC_PDU_CMD_RSP_MASK … #define LLC_PDU_CMD … #define LLC_PDU_RSP … #define LLC_PDU_IS_CMD(pdu) … #define LLC_PDU_IS_RSP(pdu) … /* Get PDU type from 2 lowest-order bits of control field first byte */ #define LLC_PDU_TYPE_I_MASK … #define LLC_PDU_TYPE_S_MASK … #define LLC_PDU_TYPE_U_MASK … #define LLC_PDU_TYPE_MASK … #define LLC_PDU_TYPE_I … #define LLC_PDU_TYPE_S … #define LLC_PDU_TYPE_U … #define LLC_PDU_TYPE_U_XID … #define LLC_PDU_TYPE_IS_I(pdu) … #define LLC_PDU_TYPE_IS_U(pdu) … #define LLC_PDU_TYPE_IS_S(pdu) … /* U-format PDU control field masks */ #define LLC_U_PF_BIT_MASK … #define LLC_U_PF_IS_1(pdu) … #define LLC_U_PF_IS_0(pdu) … #define LLC_U_PDU_CMD_MASK … #define LLC_U_PDU_CMD(pdu) … #define LLC_U_PDU_RSP(pdu) … #define LLC_1_PDU_CMD_UI … #define LLC_1_PDU_CMD_XID … #define LLC_1_PDU_CMD_TEST … #define LLC_2_PDU_CMD_SABME … #define LLC_2_PDU_CMD_DISC … #define LLC_2_PDU_RSP_UA … #define LLC_2_PDU_RSP_DM … #define LLC_2_PDU_RSP_FRMR … /* Type 1 operations */ /* XID information field bit masks */ /* LLC format identifier (byte 1) */ #define LLC_XID_FMT_ID … /* LLC types/classes identifier (byte 2) */ #define LLC_XID_CLASS_ZEROS_MASK … #define LLC_XID_CLASS_MASK … #define LLC_XID_NULL_CLASS_1 … #define LLC_XID_NULL_CLASS_2 … #define LLC_XID_NULL_CLASS_3 … #define LLC_XID_NULL_CLASS_4 … #define LLC_XID_NNULL_TYPE_1 … #define LLC_XID_NNULL_TYPE_2 … #define LLC_XID_NNULL_TYPE_3 … #define LLC_XID_NNULL_TYPE_1_2 … #define LLC_XID_NNULL_TYPE_1_3 … #define LLC_XID_NNULL_TYPE_2_3 … #define LLC_XID_NNULL_ALL … /* Sender Receive Window (byte 3) */ #define LLC_XID_RW_MASK … #define LLC_XID_MIN_RW … /* Type 2 operations */ #define LLC_2_SEQ_NBR_MODULO … /* I-PDU masks ('ctrl' is I-PDU control word) */ #define LLC_I_GET_NS(pdu) … #define LLC_I_GET_NR(pdu) … #define LLC_I_PF_BIT_MASK … #define LLC_I_PF_IS_0(pdu) … #define LLC_I_PF_IS_1(pdu) … /* S-PDU supervisory commands and responses */ #define LLC_S_PDU_CMD_MASK … #define LLC_S_PDU_CMD(pdu) … #define LLC_S_PDU_RSP(pdu) … #define LLC_2_PDU_CMD_RR … #define LLC_2_PDU_RSP_RR … #define LLC_2_PDU_CMD_REJ … #define LLC_2_PDU_RSP_REJ … #define LLC_2_PDU_CMD_RNR … #define LLC_2_PDU_RSP_RNR … #define LLC_S_PF_BIT_MASK … #define LLC_S_PF_IS_0(pdu) … #define LLC_S_PF_IS_1(pdu) … #define PDU_SUPV_GET_Nr(pdu) … #define PDU_GET_NEXT_Vr(sn) … /* FRMR information field macros */ #define FRMR_INFO_LENGTH … /* * info is pointer to FRMR info field structure; 'rej_ctrl' is byte pointer * (if U-PDU) or word pointer to rejected PDU control field */ #define FRMR_INFO_SET_REJ_CNTRL(info,rej_ctrl) … /* * Info is pointer to FRMR info field structure; 'vs' is a byte containing * send state variable value in low-order 7 bits (insure the lowest-order * bit remains zero (0)) */ #define FRMR_INFO_SET_Vs(info,vs) … #define FRMR_INFO_SET_Vr(info,vr) … /* * Info is pointer to FRMR info field structure; 'cr' is a byte containing * the C/R bit value in the low-order bit */ #define FRMR_INFO_SET_C_R_BIT(info, cr) … /* * In the remaining five macros, 'info' is pointer to FRMR info field * structure; 'ind' is a byte containing the bit value to set in the * lowest-order bit) */ #define FRMR_INFO_SET_INVALID_PDU_CTRL_IND(info, ind) … #define FRMR_INFO_SET_INVALID_PDU_INFO_IND(info, ind) … #define FRMR_INFO_SET_PDU_INFO_2LONG_IND(info, ind) … #define FRMR_INFO_SET_PDU_INVALID_Nr_IND(info, ind) … #define FRMR_INFO_SET_PDU_INVALID_Ns_IND(info, ind) … /* Sequence-numbered PDU format (4 bytes in length) */ struct llc_pdu_sn { … } __packed; static inline struct llc_pdu_sn *llc_pdu_sn_hdr(struct sk_buff *skb) { … } /* Un-numbered PDU format (3 bytes in length) */ struct llc_pdu_un { … } __packed; static inline struct llc_pdu_un *llc_pdu_un_hdr(struct sk_buff *skb) { … } /** * llc_pdu_header_init - initializes pdu header * @skb: input skb that header must be set into it. * @type: type of PDU (U, I or S). * @ssap: source sap. * @dsap: destination sap. * @cr: command/response bit (0 or 1). * * This function sets DSAP, SSAP and command/Response bit in LLC header. */ static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type, u8 ssap, u8 dsap, u8 cr) { … } /** * llc_pdu_decode_sa - extracs source address (MAC) of input frame * @skb: input skb that source address must be extracted from it. * @sa: pointer to source address (6 byte array). * * This function extracts source address(MAC) of input frame. */ static inline void llc_pdu_decode_sa(struct sk_buff *skb, u8 *sa) { … } /** * llc_pdu_decode_da - extracts dest address of input frame * @skb: input skb that destination address must be extracted from it * @da: pointer to destination address (6 byte array). * * This function extracts destination address(MAC) of input frame. */ static inline void llc_pdu_decode_da(struct sk_buff *skb, u8 *da) { … } /** * llc_pdu_decode_ssap - extracts source SAP of input frame * @skb: input skb that source SAP must be extracted from it. * @ssap: source SAP (output argument). * * This function extracts source SAP of input frame. Right bit of SSAP is * command/response bit. */ static inline void llc_pdu_decode_ssap(struct sk_buff *skb, u8 *ssap) { … } /** * llc_pdu_decode_dsap - extracts dest SAP of input frame * @skb: input skb that destination SAP must be extracted from it. * @dsap: destination SAP (output argument). * * This function extracts destination SAP of input frame. right bit of * DSAP designates individual/group SAP. */ static inline void llc_pdu_decode_dsap(struct sk_buff *skb, u8 *dsap) { … } /** * llc_pdu_init_as_ui_cmd - sets LLC header as UI PDU * @skb: input skb that header must be set into it. * * This function sets third byte of LLC header as a UI PDU. */ static inline void llc_pdu_init_as_ui_cmd(struct sk_buff *skb) { … } /** * llc_pdu_init_as_test_cmd - sets PDU as TEST * @skb: Address of the skb to build * * Sets a PDU as TEST */ static inline void llc_pdu_init_as_test_cmd(struct sk_buff *skb) { … } /** * llc_pdu_init_as_test_rsp - build TEST response PDU * @skb: Address of the skb to build * @ev_skb: The received TEST command PDU frame * * Builds a pdu frame as a TEST response. */ static inline void llc_pdu_init_as_test_rsp(struct sk_buff *skb, struct sk_buff *ev_skb) { … } /* LLC Type 1 XID command/response information fields format */ struct llc_xid_info { … } __packed; /** * llc_pdu_init_as_xid_cmd - sets bytes 3, 4 & 5 of LLC header as XID * @skb: input skb that header must be set into it. * @svcs_supported: The class of the LLC (I or II) * @rx_window: The size of the receive window of the LLC * * This function sets third,fourth,fifth and sixth bytes of LLC header as * a XID PDU. */ static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb, u8 svcs_supported, u8 rx_window) { … } /** * llc_pdu_init_as_xid_rsp - builds XID response PDU * @skb: Address of the skb to build * @svcs_supported: The class of the LLC (I or II) * @rx_window: The size of the receive window of the LLC * * Builds a pdu frame as an XID response. */ static inline void llc_pdu_init_as_xid_rsp(struct sk_buff *skb, u8 svcs_supported, u8 rx_window) { … } /* LLC Type 2 FRMR response information field format */ struct llc_frmr_info { … } __packed; void llc_pdu_set_cmd_rsp(struct sk_buff *skb, u8 type); void llc_pdu_set_pf_bit(struct sk_buff *skb, u8 bit_value); void llc_pdu_decode_pf_bit(struct sk_buff *skb, u8 *pf_bit); void llc_pdu_init_as_disc_cmd(struct sk_buff *skb, u8 p_bit); void llc_pdu_init_as_i_cmd(struct sk_buff *skb, u8 p_bit, u8 ns, u8 nr); void llc_pdu_init_as_rej_cmd(struct sk_buff *skb, u8 p_bit, u8 nr); void llc_pdu_init_as_rnr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr); void llc_pdu_init_as_rr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr); void llc_pdu_init_as_sabme_cmd(struct sk_buff *skb, u8 p_bit); void llc_pdu_init_as_dm_rsp(struct sk_buff *skb, u8 f_bit); void llc_pdu_init_as_frmr_rsp(struct sk_buff *skb, struct llc_pdu_sn *prev_pdu, u8 f_bit, u8 vs, u8 vr, u8 vzyxw); void llc_pdu_init_as_rr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr); void llc_pdu_init_as_rej_rsp(struct sk_buff *skb, u8 f_bit, u8 nr); void llc_pdu_init_as_rnr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr); void llc_pdu_init_as_ua_rsp(struct sk_buff *skb, u8 f_bit); #endif /* LLC_PDU_H */
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