11da177e4SLinus Torvalds #ifndef LLC_PDU_H
21da177e4SLinus Torvalds #define LLC_PDU_H
31da177e4SLinus Torvalds /*
41da177e4SLinus Torvalds * Copyright (c) 1997 by Procom Technology,Inc.
51da177e4SLinus Torvalds * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * This program can be redistributed or modified under the terms of the
81da177e4SLinus Torvalds * GNU General Public License as published by the Free Software Foundation.
91da177e4SLinus Torvalds * This program is distributed without any warranty or implied warranty
101da177e4SLinus Torvalds * of merchantability or fitness for a particular purpose.
111da177e4SLinus Torvalds *
121da177e4SLinus Torvalds * See the GNU General Public License for more details.
131da177e4SLinus Torvalds */
141da177e4SLinus Torvalds
151da177e4SLinus Torvalds #include <linux/if_ether.h>
161da177e4SLinus Torvalds
171da177e4SLinus Torvalds /* Lengths of frame formats */
181da177e4SLinus Torvalds #define LLC_PDU_LEN_I 4 /* header and 2 control bytes */
191da177e4SLinus Torvalds #define LLC_PDU_LEN_S 4
201da177e4SLinus Torvalds #define LLC_PDU_LEN_U 3 /* header and 1 control byte */
21c7c9d210SPavel Skripkin /* header and 1 control byte and XID info */
22c7c9d210SPavel Skripkin #define LLC_PDU_LEN_U_XID (LLC_PDU_LEN_U + sizeof(struct llc_xid_info))
231da177e4SLinus Torvalds /* Known SAP addresses */
241da177e4SLinus Torvalds #define LLC_GLOBAL_SAP 0xFF
251da177e4SLinus Torvalds #define LLC_NULL_SAP 0x00 /* not network-layer visible */
261da177e4SLinus Torvalds #define LLC_MGMT_INDIV 0x02 /* station LLC mgmt indiv addr */
271da177e4SLinus Torvalds #define LLC_MGMT_GRP 0x03 /* station LLC mgmt group addr */
281da177e4SLinus Torvalds #define LLC_RDE_SAP 0xA6 /* route ... */
291da177e4SLinus Torvalds
301da177e4SLinus Torvalds /* SAP field bit masks */
311da177e4SLinus Torvalds #define LLC_ISO_RESERVED_SAP 0x02
321da177e4SLinus Torvalds #define LLC_SAP_GROUP_DSAP 0x01
331da177e4SLinus Torvalds #define LLC_SAP_RESP_SSAP 0x01
341da177e4SLinus Torvalds
351da177e4SLinus Torvalds /* Group/individual DSAP indicator is DSAP field */
361da177e4SLinus Torvalds #define LLC_PDU_GROUP_DSAP_MASK 0x01
371da177e4SLinus Torvalds #define LLC_PDU_IS_GROUP_DSAP(pdu) \
381da177e4SLinus Torvalds ((pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
391da177e4SLinus Torvalds #define LLC_PDU_IS_INDIV_DSAP(pdu) \
401da177e4SLinus Torvalds (!(pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
411da177e4SLinus Torvalds
421da177e4SLinus Torvalds /* Command/response PDU indicator in SSAP field */
431da177e4SLinus Torvalds #define LLC_PDU_CMD_RSP_MASK 0x01
441da177e4SLinus Torvalds #define LLC_PDU_CMD 0
451da177e4SLinus Torvalds #define LLC_PDU_RSP 1
461da177e4SLinus Torvalds #define LLC_PDU_IS_CMD(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 0 : 1)
471da177e4SLinus Torvalds #define LLC_PDU_IS_RSP(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 1 : 0)
481da177e4SLinus Torvalds
491da177e4SLinus Torvalds /* Get PDU type from 2 lowest-order bits of control field first byte */
501da177e4SLinus Torvalds #define LLC_PDU_TYPE_I_MASK 0x01 /* 16-bit control field */
511da177e4SLinus Torvalds #define LLC_PDU_TYPE_S_MASK 0x03
521da177e4SLinus Torvalds #define LLC_PDU_TYPE_U_MASK 0x03 /* 8-bit control field */
531da177e4SLinus Torvalds #define LLC_PDU_TYPE_MASK 0x03
541da177e4SLinus Torvalds
551da177e4SLinus Torvalds #define LLC_PDU_TYPE_I 0 /* first bit */
561da177e4SLinus Torvalds #define LLC_PDU_TYPE_S 1 /* first two bits */
571da177e4SLinus Torvalds #define LLC_PDU_TYPE_U 3 /* first two bits */
58c7c9d210SPavel Skripkin #define LLC_PDU_TYPE_U_XID 4 /* private type for detecting XID commands */
591da177e4SLinus Torvalds
601da177e4SLinus Torvalds #define LLC_PDU_TYPE_IS_I(pdu) \
611da177e4SLinus Torvalds ((!(pdu->ctrl_1 & LLC_PDU_TYPE_I_MASK)) ? 1 : 0)
621da177e4SLinus Torvalds
631da177e4SLinus Torvalds #define LLC_PDU_TYPE_IS_U(pdu) \
641da177e4SLinus Torvalds (((pdu->ctrl_1 & LLC_PDU_TYPE_U_MASK) == LLC_PDU_TYPE_U) ? 1 : 0)
651da177e4SLinus Torvalds
661da177e4SLinus Torvalds #define LLC_PDU_TYPE_IS_S(pdu) \
671da177e4SLinus Torvalds (((pdu->ctrl_1 & LLC_PDU_TYPE_S_MASK) == LLC_PDU_TYPE_S) ? 1 : 0)
681da177e4SLinus Torvalds
691da177e4SLinus Torvalds /* U-format PDU control field masks */
701da177e4SLinus Torvalds #define LLC_U_PF_BIT_MASK 0x10 /* P/F bit mask */
711da177e4SLinus Torvalds #define LLC_U_PF_IS_1(pdu) ((pdu->ctrl_1 & LLC_U_PF_BIT_MASK) ? 1 : 0)
721da177e4SLinus Torvalds #define LLC_U_PF_IS_0(pdu) ((!(pdu->ctrl_1 & LLC_U_PF_BIT_MASK)) ? 1 : 0)
731da177e4SLinus Torvalds
741da177e4SLinus Torvalds #define LLC_U_PDU_CMD_MASK 0xEC /* cmd/rsp mask */
751da177e4SLinus Torvalds #define LLC_U_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
761da177e4SLinus Torvalds #define LLC_U_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
771da177e4SLinus Torvalds
781da177e4SLinus Torvalds #define LLC_1_PDU_CMD_UI 0x00 /* Type 1 cmds/rsps */
791da177e4SLinus Torvalds #define LLC_1_PDU_CMD_XID 0xAC
801da177e4SLinus Torvalds #define LLC_1_PDU_CMD_TEST 0xE0
811da177e4SLinus Torvalds
821da177e4SLinus Torvalds #define LLC_2_PDU_CMD_SABME 0x6C /* Type 2 cmds/rsps */
831da177e4SLinus Torvalds #define LLC_2_PDU_CMD_DISC 0x40
841da177e4SLinus Torvalds #define LLC_2_PDU_RSP_UA 0x60
851da177e4SLinus Torvalds #define LLC_2_PDU_RSP_DM 0x0C
861da177e4SLinus Torvalds #define LLC_2_PDU_RSP_FRMR 0x84
871da177e4SLinus Torvalds
881da177e4SLinus Torvalds /* Type 1 operations */
891da177e4SLinus Torvalds
901da177e4SLinus Torvalds /* XID information field bit masks */
911da177e4SLinus Torvalds
921da177e4SLinus Torvalds /* LLC format identifier (byte 1) */
931da177e4SLinus Torvalds #define LLC_XID_FMT_ID 0x81 /* first byte must be this */
941da177e4SLinus Torvalds
951da177e4SLinus Torvalds /* LLC types/classes identifier (byte 2) */
961da177e4SLinus Torvalds #define LLC_XID_CLASS_ZEROS_MASK 0xE0 /* these must be zeros */
971da177e4SLinus Torvalds #define LLC_XID_CLASS_MASK 0x1F /* AND with byte to get below */
981da177e4SLinus Torvalds
991da177e4SLinus Torvalds #define LLC_XID_NULL_CLASS_1 0x01 /* if NULL LSAP...use these */
1001da177e4SLinus Torvalds #define LLC_XID_NULL_CLASS_2 0x03
1011da177e4SLinus Torvalds #define LLC_XID_NULL_CLASS_3 0x05
1021da177e4SLinus Torvalds #define LLC_XID_NULL_CLASS_4 0x07
1031da177e4SLinus Torvalds
1041da177e4SLinus Torvalds #define LLC_XID_NNULL_TYPE_1 0x01 /* if non-NULL LSAP...use these */
1051da177e4SLinus Torvalds #define LLC_XID_NNULL_TYPE_2 0x02
1061da177e4SLinus Torvalds #define LLC_XID_NNULL_TYPE_3 0x04
1071da177e4SLinus Torvalds #define LLC_XID_NNULL_TYPE_1_2 0x03
1081da177e4SLinus Torvalds #define LLC_XID_NNULL_TYPE_1_3 0x05
1091da177e4SLinus Torvalds #define LLC_XID_NNULL_TYPE_2_3 0x06
1101da177e4SLinus Torvalds #define LLC_XID_NNULL_ALL 0x07
1111da177e4SLinus Torvalds
1121da177e4SLinus Torvalds /* Sender Receive Window (byte 3) */
1131da177e4SLinus Torvalds #define LLC_XID_RW_MASK 0xFE /* AND with value to get below */
1141da177e4SLinus Torvalds
1151da177e4SLinus Torvalds #define LLC_XID_MIN_RW 0x02 /* lowest-order bit always zero */
1161da177e4SLinus Torvalds
1171da177e4SLinus Torvalds /* Type 2 operations */
1181da177e4SLinus Torvalds
1191da177e4SLinus Torvalds #define LLC_2_SEQ_NBR_MODULO ((u8) 128)
1201da177e4SLinus Torvalds
1211da177e4SLinus Torvalds /* I-PDU masks ('ctrl' is I-PDU control word) */
1221da177e4SLinus Torvalds #define LLC_I_GET_NS(pdu) (u8)((pdu->ctrl_1 & 0xFE) >> 1)
1231da177e4SLinus Torvalds #define LLC_I_GET_NR(pdu) (u8)((pdu->ctrl_2 & 0xFE) >> 1)
1241da177e4SLinus Torvalds
1251da177e4SLinus Torvalds #define LLC_I_PF_BIT_MASK 0x01
1261da177e4SLinus Torvalds
1271da177e4SLinus Torvalds #define LLC_I_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_I_PF_BIT_MASK)) ? 1 : 0)
1281da177e4SLinus Torvalds #define LLC_I_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_I_PF_BIT_MASK) ? 1 : 0)
1291da177e4SLinus Torvalds
1301da177e4SLinus Torvalds /* S-PDU supervisory commands and responses */
1311da177e4SLinus Torvalds
1321da177e4SLinus Torvalds #define LLC_S_PDU_CMD_MASK 0x0C
1331da177e4SLinus Torvalds #define LLC_S_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
1341da177e4SLinus Torvalds #define LLC_S_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
1351da177e4SLinus Torvalds
1361da177e4SLinus Torvalds #define LLC_2_PDU_CMD_RR 0x00 /* rx ready cmd */
1371da177e4SLinus Torvalds #define LLC_2_PDU_RSP_RR 0x00 /* rx ready rsp */
1381da177e4SLinus Torvalds #define LLC_2_PDU_CMD_REJ 0x08 /* reject PDU cmd */
1391da177e4SLinus Torvalds #define LLC_2_PDU_RSP_REJ 0x08 /* reject PDU rsp */
1401da177e4SLinus Torvalds #define LLC_2_PDU_CMD_RNR 0x04 /* rx not ready cmd */
1411da177e4SLinus Torvalds #define LLC_2_PDU_RSP_RNR 0x04 /* rx not ready rsp */
1421da177e4SLinus Torvalds
1431da177e4SLinus Torvalds #define LLC_S_PF_BIT_MASK 0x01
1441da177e4SLinus Torvalds #define LLC_S_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_S_PF_BIT_MASK)) ? 1 : 0)
1451da177e4SLinus Torvalds #define LLC_S_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_S_PF_BIT_MASK) ? 1 : 0)
1461da177e4SLinus Torvalds
1471da177e4SLinus Torvalds #define PDU_SUPV_GET_Nr(pdu) ((pdu->ctrl_2 & 0xFE) >> 1)
1487e030963SDaniel Borkmann #define PDU_GET_NEXT_Vr(sn) (((sn) + 1) & ~LLC_2_SEQ_NBR_MODULO)
1491da177e4SLinus Torvalds
1501da177e4SLinus Torvalds /* FRMR information field macros */
1511da177e4SLinus Torvalds
1521da177e4SLinus Torvalds #define FRMR_INFO_LENGTH 5 /* 5 bytes of information */
1531da177e4SLinus Torvalds
1541da177e4SLinus Torvalds /*
1551da177e4SLinus Torvalds * info is pointer to FRMR info field structure; 'rej_ctrl' is byte pointer
1561da177e4SLinus Torvalds * (if U-PDU) or word pointer to rejected PDU control field
1571da177e4SLinus Torvalds */
1581da177e4SLinus Torvalds #define FRMR_INFO_SET_REJ_CNTRL(info,rej_ctrl) \
1591da177e4SLinus Torvalds info->rej_pdu_ctrl = ((*((u8 *) rej_ctrl) & \
1601da177e4SLinus Torvalds LLC_PDU_TYPE_U) != LLC_PDU_TYPE_U ? \
1611da177e4SLinus Torvalds (u16)*((u16 *) rej_ctrl) : \
1621da177e4SLinus Torvalds (((u16) *((u8 *) rej_ctrl)) & 0x00FF))
1631da177e4SLinus Torvalds
1641da177e4SLinus Torvalds /*
1651da177e4SLinus Torvalds * Info is pointer to FRMR info field structure; 'vs' is a byte containing
1661da177e4SLinus Torvalds * send state variable value in low-order 7 bits (insure the lowest-order
1671da177e4SLinus Torvalds * bit remains zero (0))
1681da177e4SLinus Torvalds */
1691da177e4SLinus Torvalds #define FRMR_INFO_SET_Vs(info,vs) (info->curr_ssv = (((u8) vs) << 1))
1701da177e4SLinus Torvalds #define FRMR_INFO_SET_Vr(info,vr) (info->curr_rsv = (((u8) vr) << 1))
1711da177e4SLinus Torvalds
1721da177e4SLinus Torvalds /*
1731da177e4SLinus Torvalds * Info is pointer to FRMR info field structure; 'cr' is a byte containing
1741da177e4SLinus Torvalds * the C/R bit value in the low-order bit
1751da177e4SLinus Torvalds */
1761da177e4SLinus Torvalds #define FRMR_INFO_SET_C_R_BIT(info, cr) (info->curr_rsv |= (((u8) cr) & 0x01))
1771da177e4SLinus Torvalds
1781da177e4SLinus Torvalds /*
1791da177e4SLinus Torvalds * In the remaining five macros, 'info' is pointer to FRMR info field
1801da177e4SLinus Torvalds * structure; 'ind' is a byte containing the bit value to set in the
1811da177e4SLinus Torvalds * lowest-order bit)
1821da177e4SLinus Torvalds */
1831da177e4SLinus Torvalds #define FRMR_INFO_SET_INVALID_PDU_CTRL_IND(info, ind) \
1841da177e4SLinus Torvalds (info->ind_bits = ((info->ind_bits & 0xFE) | (((u8) ind) & 0x01)))
1851da177e4SLinus Torvalds
1861da177e4SLinus Torvalds #define FRMR_INFO_SET_INVALID_PDU_INFO_IND(info, ind) \
1871da177e4SLinus Torvalds (info->ind_bits = ( (info->ind_bits & 0xFD) | (((u8) ind) & 0x02)))
1881da177e4SLinus Torvalds
1891da177e4SLinus Torvalds #define FRMR_INFO_SET_PDU_INFO_2LONG_IND(info, ind) \
1901da177e4SLinus Torvalds (info->ind_bits = ( (info->ind_bits & 0xFB) | (((u8) ind) & 0x04)))
1911da177e4SLinus Torvalds
1921da177e4SLinus Torvalds #define FRMR_INFO_SET_PDU_INVALID_Nr_IND(info, ind) \
1931da177e4SLinus Torvalds (info->ind_bits = ( (info->ind_bits & 0xF7) | (((u8) ind) & 0x08)))
1941da177e4SLinus Torvalds
1951da177e4SLinus Torvalds #define FRMR_INFO_SET_PDU_INVALID_Ns_IND(info, ind) \
1961da177e4SLinus Torvalds (info->ind_bits = ( (info->ind_bits & 0xEF) | (((u8) ind) & 0x10)))
1971da177e4SLinus Torvalds
1981da177e4SLinus Torvalds /* Sequence-numbered PDU format (4 bytes in length) */
1991da177e4SLinus Torvalds struct llc_pdu_sn {
2001da177e4SLinus Torvalds u8 dsap;
2011da177e4SLinus Torvalds u8 ssap;
2021da177e4SLinus Torvalds u8 ctrl_1;
2031da177e4SLinus Torvalds u8 ctrl_2;
204a10e1466SVitalii Demianets } __packed;
2051da177e4SLinus Torvalds
llc_pdu_sn_hdr(struct sk_buff * skb)2061da177e4SLinus Torvalds static inline struct llc_pdu_sn *llc_pdu_sn_hdr(struct sk_buff *skb)
2071da177e4SLinus Torvalds {
208d56f90a7SArnaldo Carvalho de Melo return (struct llc_pdu_sn *)skb_network_header(skb);
2091da177e4SLinus Torvalds }
2101da177e4SLinus Torvalds
2111da177e4SLinus Torvalds /* Un-numbered PDU format (3 bytes in length) */
2121da177e4SLinus Torvalds struct llc_pdu_un {
2131da177e4SLinus Torvalds u8 dsap;
2141da177e4SLinus Torvalds u8 ssap;
2151da177e4SLinus Torvalds u8 ctrl_1;
216a10e1466SVitalii Demianets } __packed;
2171da177e4SLinus Torvalds
llc_pdu_un_hdr(struct sk_buff * skb)2181da177e4SLinus Torvalds static inline struct llc_pdu_un *llc_pdu_un_hdr(struct sk_buff *skb)
2191da177e4SLinus Torvalds {
220d56f90a7SArnaldo Carvalho de Melo return (struct llc_pdu_un *)skb_network_header(skb);
2211da177e4SLinus Torvalds }
2221da177e4SLinus Torvalds
2231da177e4SLinus Torvalds /**
2241da177e4SLinus Torvalds * llc_pdu_header_init - initializes pdu header
2251da177e4SLinus Torvalds * @skb: input skb that header must be set into it.
2261da177e4SLinus Torvalds * @type: type of PDU (U, I or S).
2271da177e4SLinus Torvalds * @ssap: source sap.
2281da177e4SLinus Torvalds * @dsap: destination sap.
2291da177e4SLinus Torvalds * @cr: command/response bit (0 or 1).
2301da177e4SLinus Torvalds *
2311da177e4SLinus Torvalds * This function sets DSAP, SSAP and command/Response bit in LLC header.
2321da177e4SLinus Torvalds */
llc_pdu_header_init(struct sk_buff * skb,u8 type,u8 ssap,u8 dsap,u8 cr)2331da177e4SLinus Torvalds static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type,
2341da177e4SLinus Torvalds u8 ssap, u8 dsap, u8 cr)
2351da177e4SLinus Torvalds {
236c7c9d210SPavel Skripkin int hlen = 4; /* default value for I and S types */
23737e66366SArnaldo Carvalho de Melo struct llc_pdu_un *pdu;
23837e66366SArnaldo Carvalho de Melo
239c7c9d210SPavel Skripkin switch (type) {
240c7c9d210SPavel Skripkin case LLC_PDU_TYPE_U:
241c7c9d210SPavel Skripkin hlen = 3;
242c7c9d210SPavel Skripkin break;
243c7c9d210SPavel Skripkin case LLC_PDU_TYPE_U_XID:
244c7c9d210SPavel Skripkin hlen = 6;
245c7c9d210SPavel Skripkin break;
246c7c9d210SPavel Skripkin }
247c7c9d210SPavel Skripkin
24837e66366SArnaldo Carvalho de Melo skb_push(skb, hlen);
249c1d2bbe1SArnaldo Carvalho de Melo skb_reset_network_header(skb);
25037e66366SArnaldo Carvalho de Melo pdu = llc_pdu_un_hdr(skb);
2511da177e4SLinus Torvalds pdu->dsap = dsap;
2521da177e4SLinus Torvalds pdu->ssap = ssap;
2531da177e4SLinus Torvalds pdu->ssap |= cr;
2541da177e4SLinus Torvalds }
2551da177e4SLinus Torvalds
2561da177e4SLinus Torvalds /**
2571da177e4SLinus Torvalds * llc_pdu_decode_sa - extracs source address (MAC) of input frame
2581da177e4SLinus Torvalds * @skb: input skb that source address must be extracted from it.
2591da177e4SLinus Torvalds * @sa: pointer to source address (6 byte array).
2601da177e4SLinus Torvalds *
2611da177e4SLinus Torvalds * This function extracts source address(MAC) of input frame.
2621da177e4SLinus Torvalds */
llc_pdu_decode_sa(struct sk_buff * skb,u8 * sa)2631da177e4SLinus Torvalds static inline void llc_pdu_decode_sa(struct sk_buff *skb, u8 *sa)
2641da177e4SLinus Torvalds {
2651da177e4SLinus Torvalds memcpy(sa, eth_hdr(skb)->h_source, ETH_ALEN);
2661da177e4SLinus Torvalds }
2671da177e4SLinus Torvalds
2681da177e4SLinus Torvalds /**
2691da177e4SLinus Torvalds * llc_pdu_decode_da - extracts dest address of input frame
2701da177e4SLinus Torvalds * @skb: input skb that destination address must be extracted from it
271*201a0883SRandy Dunlap * @da: pointer to destination address (6 byte array).
2721da177e4SLinus Torvalds *
2731da177e4SLinus Torvalds * This function extracts destination address(MAC) of input frame.
2741da177e4SLinus Torvalds */
llc_pdu_decode_da(struct sk_buff * skb,u8 * da)2751da177e4SLinus Torvalds static inline void llc_pdu_decode_da(struct sk_buff *skb, u8 *da)
2761da177e4SLinus Torvalds {
2771da177e4SLinus Torvalds memcpy(da, eth_hdr(skb)->h_dest, ETH_ALEN);
2781da177e4SLinus Torvalds }
2791da177e4SLinus Torvalds
2801da177e4SLinus Torvalds /**
2811da177e4SLinus Torvalds * llc_pdu_decode_ssap - extracts source SAP of input frame
2821da177e4SLinus Torvalds * @skb: input skb that source SAP must be extracted from it.
2831da177e4SLinus Torvalds * @ssap: source SAP (output argument).
2841da177e4SLinus Torvalds *
2851da177e4SLinus Torvalds * This function extracts source SAP of input frame. Right bit of SSAP is
2861da177e4SLinus Torvalds * command/response bit.
2871da177e4SLinus Torvalds */
llc_pdu_decode_ssap(struct sk_buff * skb,u8 * ssap)2881da177e4SLinus Torvalds static inline void llc_pdu_decode_ssap(struct sk_buff *skb, u8 *ssap)
2891da177e4SLinus Torvalds {
2901da177e4SLinus Torvalds *ssap = llc_pdu_un_hdr(skb)->ssap & 0xFE;
2911da177e4SLinus Torvalds }
2921da177e4SLinus Torvalds
2931da177e4SLinus Torvalds /**
2941da177e4SLinus Torvalds * llc_pdu_decode_dsap - extracts dest SAP of input frame
2951da177e4SLinus Torvalds * @skb: input skb that destination SAP must be extracted from it.
2961da177e4SLinus Torvalds * @dsap: destination SAP (output argument).
2971da177e4SLinus Torvalds *
2981da177e4SLinus Torvalds * This function extracts destination SAP of input frame. right bit of
2991da177e4SLinus Torvalds * DSAP designates individual/group SAP.
3001da177e4SLinus Torvalds */
llc_pdu_decode_dsap(struct sk_buff * skb,u8 * dsap)3011da177e4SLinus Torvalds static inline void llc_pdu_decode_dsap(struct sk_buff *skb, u8 *dsap)
3021da177e4SLinus Torvalds {
3031da177e4SLinus Torvalds *dsap = llc_pdu_un_hdr(skb)->dsap & 0xFE;
3041da177e4SLinus Torvalds }
3051da177e4SLinus Torvalds
3061da177e4SLinus Torvalds /**
3071da177e4SLinus Torvalds * llc_pdu_init_as_ui_cmd - sets LLC header as UI PDU
3081da177e4SLinus Torvalds * @skb: input skb that header must be set into it.
3091da177e4SLinus Torvalds *
3101da177e4SLinus Torvalds * This function sets third byte of LLC header as a UI PDU.
3111da177e4SLinus Torvalds */
llc_pdu_init_as_ui_cmd(struct sk_buff * skb)3121da177e4SLinus Torvalds static inline void llc_pdu_init_as_ui_cmd(struct sk_buff *skb)
3131da177e4SLinus Torvalds {
3141da177e4SLinus Torvalds struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
3151da177e4SLinus Torvalds
3161da177e4SLinus Torvalds pdu->ctrl_1 = LLC_PDU_TYPE_U;
3171da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_1_PDU_CMD_UI;
3181da177e4SLinus Torvalds }
3191da177e4SLinus Torvalds
3201da177e4SLinus Torvalds /**
3211da177e4SLinus Torvalds * llc_pdu_init_as_test_cmd - sets PDU as TEST
322*201a0883SRandy Dunlap * @skb: Address of the skb to build
3231da177e4SLinus Torvalds *
3241da177e4SLinus Torvalds * Sets a PDU as TEST
3251da177e4SLinus Torvalds */
llc_pdu_init_as_test_cmd(struct sk_buff * skb)3261da177e4SLinus Torvalds static inline void llc_pdu_init_as_test_cmd(struct sk_buff *skb)
3271da177e4SLinus Torvalds {
3281da177e4SLinus Torvalds struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
3291da177e4SLinus Torvalds
3301da177e4SLinus Torvalds pdu->ctrl_1 = LLC_PDU_TYPE_U;
3311da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;
3321da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
3331da177e4SLinus Torvalds }
3341da177e4SLinus Torvalds
3351da177e4SLinus Torvalds /**
3361da177e4SLinus Torvalds * llc_pdu_init_as_test_rsp - build TEST response PDU
3371da177e4SLinus Torvalds * @skb: Address of the skb to build
3381da177e4SLinus Torvalds * @ev_skb: The received TEST command PDU frame
3391da177e4SLinus Torvalds *
3401da177e4SLinus Torvalds * Builds a pdu frame as a TEST response.
3411da177e4SLinus Torvalds */
llc_pdu_init_as_test_rsp(struct sk_buff * skb,struct sk_buff * ev_skb)3421da177e4SLinus Torvalds static inline void llc_pdu_init_as_test_rsp(struct sk_buff *skb,
3431da177e4SLinus Torvalds struct sk_buff *ev_skb)
3441da177e4SLinus Torvalds {
3451da177e4SLinus Torvalds struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
3461da177e4SLinus Torvalds
3471da177e4SLinus Torvalds pdu->ctrl_1 = LLC_PDU_TYPE_U;
3481da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;
3491da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
3503fbd418aSAl Viro if (ev_skb->protocol == htons(ETH_P_802_2)) {
3511da177e4SLinus Torvalds struct llc_pdu_un *ev_pdu = llc_pdu_un_hdr(ev_skb);
3521da177e4SLinus Torvalds int dsize;
3531da177e4SLinus Torvalds
3541da177e4SLinus Torvalds dsize = ntohs(eth_hdr(ev_skb)->h_proto) - 3;
3551da177e4SLinus Torvalds memcpy(((u8 *)pdu) + 3, ((u8 *)ev_pdu) + 3, dsize);
3561da177e4SLinus Torvalds skb_put(skb, dsize);
3571da177e4SLinus Torvalds }
3581da177e4SLinus Torvalds }
3591da177e4SLinus Torvalds
3601da177e4SLinus Torvalds /* LLC Type 1 XID command/response information fields format */
3611da177e4SLinus Torvalds struct llc_xid_info {
362cf225356SJochen Friedrich u8 fmt_id; /* always 0x81 for LLC */
3631da177e4SLinus Torvalds u8 type; /* different if NULL/non-NULL LSAP */
3641da177e4SLinus Torvalds u8 rw; /* sender receive window */
365a10e1466SVitalii Demianets } __packed;
3661da177e4SLinus Torvalds
3671da177e4SLinus Torvalds /**
3681da177e4SLinus Torvalds * llc_pdu_init_as_xid_cmd - sets bytes 3, 4 & 5 of LLC header as XID
3691da177e4SLinus Torvalds * @skb: input skb that header must be set into it.
370*201a0883SRandy Dunlap * @svcs_supported: The class of the LLC (I or II)
371*201a0883SRandy Dunlap * @rx_window: The size of the receive window of the LLC
3721da177e4SLinus Torvalds *
3731da177e4SLinus Torvalds * This function sets third,fourth,fifth and sixth bytes of LLC header as
3741da177e4SLinus Torvalds * a XID PDU.
3751da177e4SLinus Torvalds */
llc_pdu_init_as_xid_cmd(struct sk_buff * skb,u8 svcs_supported,u8 rx_window)3761da177e4SLinus Torvalds static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb,
3771da177e4SLinus Torvalds u8 svcs_supported, u8 rx_window)
3781da177e4SLinus Torvalds {
3791da177e4SLinus Torvalds struct llc_xid_info *xid_info;
3801da177e4SLinus Torvalds struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
3811da177e4SLinus Torvalds
3821da177e4SLinus Torvalds pdu->ctrl_1 = LLC_PDU_TYPE_U;
3831da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_1_PDU_CMD_XID;
3841da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
3851da177e4SLinus Torvalds xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);
3861da177e4SLinus Torvalds xid_info->fmt_id = LLC_XID_FMT_ID; /* 0x81 */
3871da177e4SLinus Torvalds xid_info->type = svcs_supported;
3881da177e4SLinus Torvalds xid_info->rw = rx_window << 1; /* size of receive window */
389c7c9d210SPavel Skripkin
390c7c9d210SPavel Skripkin /* no need to push/put since llc_pdu_header_init() has already
391c7c9d210SPavel Skripkin * pushed 3 + 3 bytes
392c7c9d210SPavel Skripkin */
3931da177e4SLinus Torvalds }
3941da177e4SLinus Torvalds
3951da177e4SLinus Torvalds /**
3961da177e4SLinus Torvalds * llc_pdu_init_as_xid_rsp - builds XID response PDU
3971da177e4SLinus Torvalds * @skb: Address of the skb to build
3981da177e4SLinus Torvalds * @svcs_supported: The class of the LLC (I or II)
3991da177e4SLinus Torvalds * @rx_window: The size of the receive window of the LLC
4001da177e4SLinus Torvalds *
4011da177e4SLinus Torvalds * Builds a pdu frame as an XID response.
4021da177e4SLinus Torvalds */
llc_pdu_init_as_xid_rsp(struct sk_buff * skb,u8 svcs_supported,u8 rx_window)4031da177e4SLinus Torvalds static inline void llc_pdu_init_as_xid_rsp(struct sk_buff *skb,
4041da177e4SLinus Torvalds u8 svcs_supported, u8 rx_window)
4051da177e4SLinus Torvalds {
4061da177e4SLinus Torvalds struct llc_xid_info *xid_info;
4071da177e4SLinus Torvalds struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
4081da177e4SLinus Torvalds
4091da177e4SLinus Torvalds pdu->ctrl_1 = LLC_PDU_TYPE_U;
4101da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_1_PDU_CMD_XID;
4111da177e4SLinus Torvalds pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
4121da177e4SLinus Torvalds
4131da177e4SLinus Torvalds xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);
4141da177e4SLinus Torvalds xid_info->fmt_id = LLC_XID_FMT_ID;
4151da177e4SLinus Torvalds xid_info->type = svcs_supported;
4161da177e4SLinus Torvalds xid_info->rw = rx_window << 1;
417f83f1768SJoonwoo Park skb_put(skb, sizeof(struct llc_xid_info));
4181da177e4SLinus Torvalds }
4191da177e4SLinus Torvalds
4201da177e4SLinus Torvalds /* LLC Type 2 FRMR response information field format */
4211da177e4SLinus Torvalds struct llc_frmr_info {
4221da177e4SLinus Torvalds u16 rej_pdu_ctrl; /* bits 1-8 if U-PDU */
4231da177e4SLinus Torvalds u8 curr_ssv; /* current send state variable val */
4241da177e4SLinus Torvalds u8 curr_rsv; /* current receive state variable */
4251da177e4SLinus Torvalds u8 ind_bits; /* indicator bits set with macro */
426a10e1466SVitalii Demianets } __packed;
4271da177e4SLinus Torvalds
428bf3c710fSJoe Perches void llc_pdu_set_cmd_rsp(struct sk_buff *skb, u8 type);
429bf3c710fSJoe Perches void llc_pdu_set_pf_bit(struct sk_buff *skb, u8 bit_value);
430bf3c710fSJoe Perches void llc_pdu_decode_pf_bit(struct sk_buff *skb, u8 *pf_bit);
431bf3c710fSJoe Perches void llc_pdu_init_as_disc_cmd(struct sk_buff *skb, u8 p_bit);
432bf3c710fSJoe Perches void llc_pdu_init_as_i_cmd(struct sk_buff *skb, u8 p_bit, u8 ns, u8 nr);
433bf3c710fSJoe Perches void llc_pdu_init_as_rej_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
434bf3c710fSJoe Perches void llc_pdu_init_as_rnr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
435bf3c710fSJoe Perches void llc_pdu_init_as_rr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
436bf3c710fSJoe Perches void llc_pdu_init_as_sabme_cmd(struct sk_buff *skb, u8 p_bit);
437bf3c710fSJoe Perches void llc_pdu_init_as_dm_rsp(struct sk_buff *skb, u8 f_bit);
438bf3c710fSJoe Perches void llc_pdu_init_as_frmr_rsp(struct sk_buff *skb, struct llc_pdu_sn *prev_pdu,
4391da177e4SLinus Torvalds u8 f_bit, u8 vs, u8 vr, u8 vzyxw);
440bf3c710fSJoe Perches void llc_pdu_init_as_rr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
441bf3c710fSJoe Perches void llc_pdu_init_as_rej_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
442bf3c710fSJoe Perches void llc_pdu_init_as_rnr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
443bf3c710fSJoe Perches void llc_pdu_init_as_ua_rsp(struct sk_buff *skb, u8 f_bit);
4441da177e4SLinus Torvalds #endif /* LLC_PDU_H */
445