5  * 		 2001-2003 by Arnaldo Carvalho de Melo <[email protected]>
20 #define LLC_PDU_LEN_U		3       /* header and 1 control byte */
21 /* header and 1 control byte and XID info */
25 #define LLC_NULL_SAP	0x00	/* not network-layer visible */
38 	((pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
40 	(!(pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
46 #define LLC_PDU_IS_CMD(pdu)    ((pdu->ssap & LLC_PDU_RSP) ? 0 : 1)
47 #define LLC_PDU_IS_RSP(pdu)    ((pdu->ssap & LLC_PDU_RSP) ? 1 : 0)
49 /* Get PDU type from 2 lowest-order bits of control field first byte */
50 #define LLC_PDU_TYPE_I_MASK    0x01	/* 16-bit control field */
52 #define LLC_PDU_TYPE_U_MASK    0x03	/* 8-bit control field */
61 	((!(pdu->ctrl_1 & LLC_PDU_TYPE_I_MASK)) ? 1 : 0)
64 	(((pdu->ctrl_1 & LLC_PDU_TYPE_U_MASK) == LLC_PDU_TYPE_U) ? 1 : 0)
67 	(((pdu->ctrl_1 & LLC_PDU_TYPE_S_MASK) == LLC_PDU_TYPE_S) ? 1 : 0)
69 /* U-format PDU control field masks */
71 #define LLC_U_PF_IS_1(pdu)     ((pdu->ctrl_1 & LLC_U_PF_BIT_MASK) ? 1 : 0)
72 #define LLC_U_PF_IS_0(pdu)     ((!(pdu->ctrl_1 & LLC_U_PF_BIT_MASK)) ? 1 : 0)
75 #define LLC_U_PDU_CMD(pdu)     (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
76 #define LLC_U_PDU_RSP(pdu)     (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
92 /* LLC format identifier (byte 1) */
93 #define LLC_XID_FMT_ID		0x81	/* first byte must be this */
95 /* LLC types/classes identifier (byte 2) */
97 #define LLC_XID_CLASS_MASK		0x1F	/* AND with byte to get below */
104 #define LLC_XID_NNULL_TYPE_1	0x01	/* if non-NULL LSAP...use these */
112 /* Sender Receive Window (byte 3) */
115 #define LLC_XID_MIN_RW	0x02	/* lowest-order bit always zero */
121 /* I-PDU masks ('ctrl' is I-PDU control word) */
122 #define LLC_I_GET_NS(pdu)     (u8)((pdu->ctrl_1 & 0xFE) >> 1)
123 #define LLC_I_GET_NR(pdu)     (u8)((pdu->ctrl_2 & 0xFE) >> 1)
127 #define LLC_I_PF_IS_0(pdu)     ((!(pdu->ctrl_2 & LLC_I_PF_BIT_MASK)) ? 1 : 0)
128 #define LLC_I_PF_IS_1(pdu)     ((pdu->ctrl_2 & LLC_I_PF_BIT_MASK) ? 1 : 0)
130 /* S-PDU supervisory commands and responses */
133 #define LLC_S_PDU_CMD(pdu)     (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
134 #define LLC_S_PDU_RSP(pdu)     (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
144 #define LLC_S_PF_IS_0(pdu)     ((!(pdu->ctrl_2 & LLC_S_PF_BIT_MASK)) ? 1 : 0)
145 #define LLC_S_PF_IS_1(pdu)     ((pdu->ctrl_2 & LLC_S_PF_BIT_MASK) ? 1 : 0)
147 #define PDU_SUPV_GET_Nr(pdu)   ((pdu->ctrl_2 & 0xFE) >> 1)
155  * info is pointer to FRMR info field structure; 'rej_ctrl' is byte pointer
156  * (if U-PDU) or word pointer to rejected PDU control field
159 	info->rej_pdu_ctrl = ((*((u8 *) rej_ctrl) & \
165  * Info is pointer to FRMR info field structure; 'vs' is a byte containing
166  * send state variable value in low-order 7 bits (insure the lowest-order
169 #define FRMR_INFO_SET_Vs(info,vs) (info->curr_ssv = (((u8) vs) << 1))
170 #define FRMR_INFO_SET_Vr(info,vr) (info->curr_rsv = (((u8) vr) << 1))
173  * Info is pointer to FRMR info field structure; 'cr' is a byte containing
174  * the C/R bit value in the low-order bit
176 #define FRMR_INFO_SET_C_R_BIT(info, cr)  (info->curr_rsv |= (((u8) cr) & 0x01))
180  * structure; 'ind' is a byte containing the bit value to set in the
181  * lowest-order bit)
184        (info->ind_bits = ((info->ind_bits & 0xFE) | (((u8) ind) & 0x01)))
187        (info->ind_bits = ( (info->ind_bits & 0xFD) | (((u8) ind) & 0x02)))
190        (info->ind_bits = ( (info->ind_bits & 0xFB) | (((u8) ind) & 0x04)))
193        (info->ind_bits = ( (info->ind_bits & 0xF7) | (((u8) ind) & 0x08)))
196        (info->ind_bits = ( (info->ind_bits & 0xEF) | (((u8) ind) & 0x10)))
198 /* Sequence-numbered PDU format (4 bytes in length) */
211 /* Un-numbered PDU format (3 bytes in length) */
224  *	llc_pdu_header_init - initializes pdu header
251 	pdu->dsap = dsap;  in llc_pdu_header_init()
252 	pdu->ssap = ssap;  in llc_pdu_header_init()
253 	pdu->ssap |= cr;  in llc_pdu_header_init()
257  *	llc_pdu_decode_sa - extracts, source address (MAC) of input frame
259  *	@sa: pointer to source address (6 byte array).
265 	memcpy(sa, eth_hdr(skb)->h_source, ETH_ALEN);  in llc_pdu_decode_sa()
269  *	llc_pdu_decode_da - extracts dest address of input frame
271  *	@da: pointer to destination address (6 byte array).
277 	memcpy(da, eth_hdr(skb)->h_dest, ETH_ALEN);  in llc_pdu_decode_da()
281  *	llc_pdu_decode_ssap - extracts source SAP of input frame
290 	*ssap = llc_pdu_un_hdr(skb)->ssap & 0xFE;  in llc_pdu_decode_ssap()
294  *	llc_pdu_decode_dsap - extracts dest SAP of input frame
303 	*dsap = llc_pdu_un_hdr(skb)->dsap & 0xFE;  in llc_pdu_decode_dsap()
307  *	llc_pdu_init_as_ui_cmd - sets LLC header as UI PDU
310  *	This function sets third byte of LLC header as a UI PDU.
316 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_ui_cmd()
317 	pdu->ctrl_1 |= LLC_1_PDU_CMD_UI;  in llc_pdu_init_as_ui_cmd()
321  *	llc_pdu_init_as_test_cmd - sets PDU as TEST
330 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_test_cmd()
331 	pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;  in llc_pdu_init_as_test_cmd()
332 	pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_test_cmd()
336  *	llc_pdu_init_as_test_rsp - build TEST response PDU
347 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_test_rsp()
348 	pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;  in llc_pdu_init_as_test_rsp()
349 	pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_test_rsp()
350 	if (ev_skb->protocol == htons(ETH_P_802_2)) {  in llc_pdu_init_as_test_rsp()
354 		dsize = ntohs(eth_hdr(ev_skb)->h_proto) - 3;  in llc_pdu_init_as_test_rsp()
363 	u8 type;	/* different if NULL/non-NULL LSAP */
368  *	llc_pdu_init_as_xid_cmd - sets bytes 3, 4 & 5 of LLC header as XID
382 	pdu->ctrl_1	 = LLC_PDU_TYPE_U;  in llc_pdu_init_as_xid_cmd()
383 	pdu->ctrl_1	|= LLC_1_PDU_CMD_XID;  in llc_pdu_init_as_xid_cmd()
384 	pdu->ctrl_1	|= LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_xid_cmd()
385 	xid_info	 = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);  in llc_pdu_init_as_xid_cmd()
386 	xid_info->fmt_id = LLC_XID_FMT_ID;	/* 0x81 */  in llc_pdu_init_as_xid_cmd()
387 	xid_info->type	 = svcs_supported;  in llc_pdu_init_as_xid_cmd()
388 	xid_info->rw	 = rx_window << 1;	/* size of receive window */  in llc_pdu_init_as_xid_cmd()
396  *	llc_pdu_init_as_xid_rsp - builds XID response PDU
409 	pdu->ctrl_1	 = LLC_PDU_TYPE_U;  in llc_pdu_init_as_xid_rsp()
410 	pdu->ctrl_1	|= LLC_1_PDU_CMD_XID;  in llc_pdu_init_as_xid_rsp()
411 	pdu->ctrl_1	|= LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_xid_rsp()
413 	xid_info	 = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);  in llc_pdu_init_as_xid_rsp()
414 	xid_info->fmt_id = LLC_XID_FMT_ID;  in llc_pdu_init_as_xid_rsp()
415 	xid_info->type	 = svcs_supported;  in llc_pdu_init_as_xid_rsp()
416 	xid_info->rw	 = rx_window << 1;  in llc_pdu_init_as_xid_rsp()
422 	u16 rej_pdu_ctrl;	/* bits 1-8 if U-PDU */