2  * llc_pdu.c - access to PDU internals
5  *		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
23 	llc_pdu_un_hdr(skb)->ssap |= pdu_type;  in llc_pdu_set_cmd_rsp()
27  *	llc_pdu_set_pf_bit - sets poll/final bit in LLC header
28  *	@skb: Frame to set bit in
46 		pdu->ctrl_2 = (pdu->ctrl_2 & 0xFE) | bit_value;  in llc_pdu_set_pf_bit()
49 		pdu->ctrl_1 |= (pdu->ctrl_1 & 0xEF) | (bit_value << 4);  in llc_pdu_set_pf_bit()
55  *	llc_pdu_decode_pf_bit - extracs poll/final bit from LLC header
74 		*pf_bit = pdu->ctrl_2 & LLC_S_PF_BIT_MASK;  in llc_pdu_decode_pf_bit()
77 		*pf_bit = (pdu->ctrl_1 & LLC_U_PF_BIT_MASK) >> 4;  in llc_pdu_decode_pf_bit()
83  *	llc_pdu_init_as_disc_cmd - Builds DISC PDU
87  *	Builds a pdu frame as a DISC command.
93 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_disc_cmd()
94 	pdu->ctrl_1 |= LLC_2_PDU_CMD_DISC;  in llc_pdu_init_as_disc_cmd()
95 	pdu->ctrl_1 |= ((p_bit & 1) << 4) & LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_disc_cmd()
99  *	llc_pdu_init_as_i_cmd - builds I pdu
102  *	@ns: The sequence number of the data PDU
103  *	@nr: The seq. number of the expected I PDU from the remote
105  *	Builds a pdu frame as an I command.
111 	pdu->ctrl_1  = LLC_PDU_TYPE_I;  in llc_pdu_init_as_i_cmd()
112 	pdu->ctrl_2  = 0;  in llc_pdu_init_as_i_cmd()
113 	pdu->ctrl_2 |= (p_bit & LLC_I_PF_BIT_MASK); /* p/f bit */  in llc_pdu_init_as_i_cmd()
114 	pdu->ctrl_1 |= (ns << 1) & 0xFE;   /* set N(S) in bits 2..8 */  in llc_pdu_init_as_i_cmd()
115 	pdu->ctrl_2 |= (nr << 1) & 0xFE;   /* set N(R) in bits 10..16 */  in llc_pdu_init_as_i_cmd()
119  *	llc_pdu_init_as_rej_cmd - builds REJ PDU
122  *	@nr: The seq. number of the expected I PDU from the remote
124  *	Builds a pdu frame as a REJ command.
130 	pdu->ctrl_1  = LLC_PDU_TYPE_S;  in llc_pdu_init_as_rej_cmd()
131 	pdu->ctrl_1 |= LLC_2_PDU_CMD_REJ;  in llc_pdu_init_as_rej_cmd()
132 	pdu->ctrl_2  = 0;  in llc_pdu_init_as_rej_cmd()
133 	pdu->ctrl_2 |= p_bit & LLC_S_PF_BIT_MASK;  in llc_pdu_init_as_rej_cmd()
134 	pdu->ctrl_1 &= 0x0F;    /* setting bits 5..8 to zero(reserved) */  in llc_pdu_init_as_rej_cmd()
135 	pdu->ctrl_2 |= (nr << 1) & 0xFE; /* set N(R) in bits 10..16 */  in llc_pdu_init_as_rej_cmd()
139  *	llc_pdu_init_as_rnr_cmd - builds RNR pdu
142  *	@nr: The seq. number of the expected I PDU from the remote
144  *	Builds a pdu frame as an RNR command.
150 	pdu->ctrl_1  = LLC_PDU_TYPE_S;  in llc_pdu_init_as_rnr_cmd()
151 	pdu->ctrl_1 |= LLC_2_PDU_CMD_RNR;  in llc_pdu_init_as_rnr_cmd()
152 	pdu->ctrl_2  = 0;  in llc_pdu_init_as_rnr_cmd()
153 	pdu->ctrl_2 |= p_bit & LLC_S_PF_BIT_MASK;  in llc_pdu_init_as_rnr_cmd()
154 	pdu->ctrl_1 &= 0x0F;    /* setting bits 5..8 to zero(reserved) */  in llc_pdu_init_as_rnr_cmd()
155 	pdu->ctrl_2 |= (nr << 1) & 0xFE; /* set N(R) in bits 10..16 */  in llc_pdu_init_as_rnr_cmd()
159  *	llc_pdu_init_as_rr_cmd - Builds RR pdu
162  *	@nr: The seq. number of the expected I PDU from the remote
164  *	Builds a pdu frame as an RR command.
170 	pdu->ctrl_1  = LLC_PDU_TYPE_S;  in llc_pdu_init_as_rr_cmd()
171 	pdu->ctrl_1 |= LLC_2_PDU_CMD_RR;  in llc_pdu_init_as_rr_cmd()
172 	pdu->ctrl_2  = p_bit & LLC_S_PF_BIT_MASK;  in llc_pdu_init_as_rr_cmd()
173 	pdu->ctrl_1 &= 0x0F;    /* setting bits 5..8 to zero(reserved) */  in llc_pdu_init_as_rr_cmd()
174 	pdu->ctrl_2 |= (nr << 1) & 0xFE; /* set N(R) in bits 10..16 */  in llc_pdu_init_as_rr_cmd()
178  *	llc_pdu_init_as_sabme_cmd - builds SABME pdu
182  *	Builds a pdu frame as an SABME command.
188 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_sabme_cmd()
189 	pdu->ctrl_1 |= LLC_2_PDU_CMD_SABME;  in llc_pdu_init_as_sabme_cmd()
190 	pdu->ctrl_1 |= ((p_bit & 1) << 4) & LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_sabme_cmd()
194  *	llc_pdu_init_as_dm_rsp - builds DM response pdu
198  *	Builds a pdu frame as a DM response.
204 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_dm_rsp()
205 	pdu->ctrl_1 |= LLC_2_PDU_RSP_DM;  in llc_pdu_init_as_dm_rsp()
206 	pdu->ctrl_1 |= ((f_bit & 1) << 4) & LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_dm_rsp()
210  *	llc_pdu_init_as_frmr_rsp - builds FRMR response PDU
211  *	@skb: Address of the frame to build
212  *	@prev_pdu: The rejected PDU frame
218  *	Builds a pdu frame as a FRMR response.
228 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_frmr_rsp()
229 	pdu->ctrl_1 |= LLC_2_PDU_RSP_FRMR;  in llc_pdu_init_as_frmr_rsp()
230 	pdu->ctrl_1 |= ((f_bit & 1) << 4) & LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_frmr_rsp()
232 	frmr_info = (struct llc_frmr_info *)&pdu->ctrl_2;  in llc_pdu_init_as_frmr_rsp()
233 	ctrl = (u8 *)&prev_pdu->ctrl_1;  in llc_pdu_init_as_frmr_rsp()
248  *	llc_pdu_init_as_rr_rsp - builds RR response pdu
251  *	@nr: The seq. number of the expected data PDU from the remote
253  *	Builds a pdu frame as an RR response.
259 	pdu->ctrl_1  = LLC_PDU_TYPE_S;  in llc_pdu_init_as_rr_rsp()
260 	pdu->ctrl_1 |= LLC_2_PDU_RSP_RR;  in llc_pdu_init_as_rr_rsp()
261 	pdu->ctrl_2  = 0;  in llc_pdu_init_as_rr_rsp()
262 	pdu->ctrl_2 |= f_bit & LLC_S_PF_BIT_MASK;  in llc_pdu_init_as_rr_rsp()
263 	pdu->ctrl_1 &= 0x0F;    /* setting bits 5..8 to zero(reserved) */  in llc_pdu_init_as_rr_rsp()
264 	pdu->ctrl_2 |= (nr << 1) & 0xFE;  /* set N(R) in bits 10..16 */  in llc_pdu_init_as_rr_rsp()
268  *	llc_pdu_init_as_rej_rsp - builds REJ response pdu
271  *	@nr: The seq. number of the expected data PDU from the remote
273  *	Builds a pdu frame as a REJ response.
279 	pdu->ctrl_1  = LLC_PDU_TYPE_S;  in llc_pdu_init_as_rej_rsp()
280 	pdu->ctrl_1 |= LLC_2_PDU_RSP_REJ;  in llc_pdu_init_as_rej_rsp()
281 	pdu->ctrl_2  = 0;  in llc_pdu_init_as_rej_rsp()
282 	pdu->ctrl_2 |= f_bit & LLC_S_PF_BIT_MASK;  in llc_pdu_init_as_rej_rsp()
283 	pdu->ctrl_1 &= 0x0F;    /* setting bits 5..8 to zero(reserved) */  in llc_pdu_init_as_rej_rsp()
284 	pdu->ctrl_2 |= (nr << 1) & 0xFE;  /* set N(R) in bits 10..16 */  in llc_pdu_init_as_rej_rsp()
288  *	llc_pdu_init_as_rnr_rsp - builds RNR response pdu
289  *	@skb: Address of the frame to build
291  *	@nr: The seq. number of the expected data PDU from the remote
293  *	Builds a pdu frame as an RNR response.
299 	pdu->ctrl_1  = LLC_PDU_TYPE_S;  in llc_pdu_init_as_rnr_rsp()
300 	pdu->ctrl_1 |= LLC_2_PDU_RSP_RNR;  in llc_pdu_init_as_rnr_rsp()
301 	pdu->ctrl_2  = 0;  in llc_pdu_init_as_rnr_rsp()
302 	pdu->ctrl_2 |= f_bit & LLC_S_PF_BIT_MASK;  in llc_pdu_init_as_rnr_rsp()
303 	pdu->ctrl_1 &= 0x0F;    /* setting bits 5..8 to zero(reserved) */  in llc_pdu_init_as_rnr_rsp()
304 	pdu->ctrl_2 |= (nr << 1) & 0xFE;  /* set N(R) in bits 10..16 */  in llc_pdu_init_as_rnr_rsp()
308  *	llc_pdu_init_as_ua_rsp - builds UA response pdu
309  *	@skb: Address of the frame to build
312  *	Builds a pdu frame as a UA response.
318 	pdu->ctrl_1  = LLC_PDU_TYPE_U;  in llc_pdu_init_as_ua_rsp()
319 	pdu->ctrl_1 |= LLC_2_PDU_RSP_UA;  in llc_pdu_init_as_ua_rsp()
320 	pdu->ctrl_1 |= ((f_bit & 1) << 4) & LLC_U_PF_BIT_MASK;  in llc_pdu_init_as_ua_rsp()
324  *	llc_pdu_decode_pdu_type - designates PDU type
334 	if (pdu->ctrl_1 & 1) {  in llc_pdu_decode_pdu_type()
335 		if ((pdu->ctrl_1 & LLC_PDU_TYPE_U) == LLC_PDU_TYPE_U)  in llc_pdu_decode_pdu_type()
344  *	llc_pdu_get_pf_bit - extracts p/f bit of input PDU
355 	if (pdu->ctrl_1 & 1) {  in llc_pdu_get_pf_bit()
356 		if ((pdu->ctrl_1 & LLC_PDU_TYPE_U) == LLC_PDU_TYPE_U)  in llc_pdu_get_pf_bit()
365 		pf_bit = pdu->ctrl_2 & LLC_S_PF_BIT_MASK;  in llc_pdu_get_pf_bit()
368 		pf_bit = (pdu->ctrl_1 & LLC_U_PF_BIT_MASK) >> 4;  in llc_pdu_get_pf_bit()