Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef LLC_PDU_H |
| 2 | #define LLC_PDU_H |
| 3 | /* |
| 4 | * Copyright (c) 1997 by Procom Technology,Inc. |
| 5 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 6 | * |
| 7 | * This program can be redistributed or modified under the terms of the |
| 8 | * GNU General Public License as published by the Free Software Foundation. |
| 9 | * This program is distributed without any warranty or implied warranty |
| 10 | * of merchantability or fitness for a particular purpose. |
| 11 | * |
| 12 | * See the GNU General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | /* Lengths of frame formats */ |
| 18 | #define LLC_PDU_LEN_I 4 /* header and 2 control bytes */ |
| 19 | #define LLC_PDU_LEN_S 4 |
| 20 | #define LLC_PDU_LEN_U 3 /* header and 1 control byte */ |
| 21 | /* Known SAP addresses */ |
| 22 | #define LLC_GLOBAL_SAP 0xFF |
| 23 | #define LLC_NULL_SAP 0x00 /* not network-layer visible */ |
| 24 | #define LLC_MGMT_INDIV 0x02 /* station LLC mgmt indiv addr */ |
| 25 | #define LLC_MGMT_GRP 0x03 /* station LLC mgmt group addr */ |
| 26 | #define LLC_RDE_SAP 0xA6 /* route ... */ |
| 27 | |
| 28 | /* SAP field bit masks */ |
| 29 | #define LLC_ISO_RESERVED_SAP 0x02 |
| 30 | #define LLC_SAP_GROUP_DSAP 0x01 |
| 31 | #define LLC_SAP_RESP_SSAP 0x01 |
| 32 | |
| 33 | /* Group/individual DSAP indicator is DSAP field */ |
| 34 | #define LLC_PDU_GROUP_DSAP_MASK 0x01 |
| 35 | #define LLC_PDU_IS_GROUP_DSAP(pdu) \ |
| 36 | ((pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1) |
| 37 | #define LLC_PDU_IS_INDIV_DSAP(pdu) \ |
| 38 | (!(pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1) |
| 39 | |
| 40 | /* Command/response PDU indicator in SSAP field */ |
| 41 | #define LLC_PDU_CMD_RSP_MASK 0x01 |
| 42 | #define LLC_PDU_CMD 0 |
| 43 | #define LLC_PDU_RSP 1 |
| 44 | #define LLC_PDU_IS_CMD(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 0 : 1) |
| 45 | #define LLC_PDU_IS_RSP(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 1 : 0) |
| 46 | |
| 47 | /* Get PDU type from 2 lowest-order bits of control field first byte */ |
| 48 | #define LLC_PDU_TYPE_I_MASK 0x01 /* 16-bit control field */ |
| 49 | #define LLC_PDU_TYPE_S_MASK 0x03 |
| 50 | #define LLC_PDU_TYPE_U_MASK 0x03 /* 8-bit control field */ |
| 51 | #define LLC_PDU_TYPE_MASK 0x03 |
| 52 | |
| 53 | #define LLC_PDU_TYPE_I 0 /* first bit */ |
| 54 | #define LLC_PDU_TYPE_S 1 /* first two bits */ |
| 55 | #define LLC_PDU_TYPE_U 3 /* first two bits */ |
| 56 | |
| 57 | #define LLC_PDU_TYPE_IS_I(pdu) \ |
| 58 | ((!(pdu->ctrl_1 & LLC_PDU_TYPE_I_MASK)) ? 1 : 0) |
| 59 | |
| 60 | #define LLC_PDU_TYPE_IS_U(pdu) \ |
| 61 | (((pdu->ctrl_1 & LLC_PDU_TYPE_U_MASK) == LLC_PDU_TYPE_U) ? 1 : 0) |
| 62 | |
| 63 | #define LLC_PDU_TYPE_IS_S(pdu) \ |
| 64 | (((pdu->ctrl_1 & LLC_PDU_TYPE_S_MASK) == LLC_PDU_TYPE_S) ? 1 : 0) |
| 65 | |
| 66 | /* U-format PDU control field masks */ |
| 67 | #define LLC_U_PF_BIT_MASK 0x10 /* P/F bit mask */ |
| 68 | #define LLC_U_PF_IS_1(pdu) ((pdu->ctrl_1 & LLC_U_PF_BIT_MASK) ? 1 : 0) |
| 69 | #define LLC_U_PF_IS_0(pdu) ((!(pdu->ctrl_1 & LLC_U_PF_BIT_MASK)) ? 1 : 0) |
| 70 | |
| 71 | #define LLC_U_PDU_CMD_MASK 0xEC /* cmd/rsp mask */ |
| 72 | #define LLC_U_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK) |
| 73 | #define LLC_U_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK) |
| 74 | |
| 75 | #define LLC_1_PDU_CMD_UI 0x00 /* Type 1 cmds/rsps */ |
| 76 | #define LLC_1_PDU_CMD_XID 0xAC |
| 77 | #define LLC_1_PDU_CMD_TEST 0xE0 |
| 78 | |
| 79 | #define LLC_2_PDU_CMD_SABME 0x6C /* Type 2 cmds/rsps */ |
| 80 | #define LLC_2_PDU_CMD_DISC 0x40 |
| 81 | #define LLC_2_PDU_RSP_UA 0x60 |
| 82 | #define LLC_2_PDU_RSP_DM 0x0C |
| 83 | #define LLC_2_PDU_RSP_FRMR 0x84 |
| 84 | |
| 85 | /* Type 1 operations */ |
| 86 | |
| 87 | /* XID information field bit masks */ |
| 88 | |
| 89 | /* LLC format identifier (byte 1) */ |
| 90 | #define LLC_XID_FMT_ID 0x81 /* first byte must be this */ |
| 91 | |
| 92 | /* LLC types/classes identifier (byte 2) */ |
| 93 | #define LLC_XID_CLASS_ZEROS_MASK 0xE0 /* these must be zeros */ |
| 94 | #define LLC_XID_CLASS_MASK 0x1F /* AND with byte to get below */ |
| 95 | |
| 96 | #define LLC_XID_NULL_CLASS_1 0x01 /* if NULL LSAP...use these */ |
| 97 | #define LLC_XID_NULL_CLASS_2 0x03 |
| 98 | #define LLC_XID_NULL_CLASS_3 0x05 |
| 99 | #define LLC_XID_NULL_CLASS_4 0x07 |
| 100 | |
| 101 | #define LLC_XID_NNULL_TYPE_1 0x01 /* if non-NULL LSAP...use these */ |
| 102 | #define LLC_XID_NNULL_TYPE_2 0x02 |
| 103 | #define LLC_XID_NNULL_TYPE_3 0x04 |
| 104 | #define LLC_XID_NNULL_TYPE_1_2 0x03 |
| 105 | #define LLC_XID_NNULL_TYPE_1_3 0x05 |
| 106 | #define LLC_XID_NNULL_TYPE_2_3 0x06 |
| 107 | #define LLC_XID_NNULL_ALL 0x07 |
| 108 | |
| 109 | /* Sender Receive Window (byte 3) */ |
| 110 | #define LLC_XID_RW_MASK 0xFE /* AND with value to get below */ |
| 111 | |
| 112 | #define LLC_XID_MIN_RW 0x02 /* lowest-order bit always zero */ |
| 113 | |
| 114 | /* Type 2 operations */ |
| 115 | |
| 116 | #define LLC_2_SEQ_NBR_MODULO ((u8) 128) |
| 117 | |
| 118 | /* I-PDU masks ('ctrl' is I-PDU control word) */ |
| 119 | #define LLC_I_GET_NS(pdu) (u8)((pdu->ctrl_1 & 0xFE) >> 1) |
| 120 | #define LLC_I_GET_NR(pdu) (u8)((pdu->ctrl_2 & 0xFE) >> 1) |
| 121 | |
| 122 | #define LLC_I_PF_BIT_MASK 0x01 |
| 123 | |
| 124 | #define LLC_I_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_I_PF_BIT_MASK)) ? 1 : 0) |
| 125 | #define LLC_I_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_I_PF_BIT_MASK) ? 1 : 0) |
| 126 | |
| 127 | /* S-PDU supervisory commands and responses */ |
| 128 | |
| 129 | #define LLC_S_PDU_CMD_MASK 0x0C |
| 130 | #define LLC_S_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK) |
| 131 | #define LLC_S_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK) |
| 132 | |
| 133 | #define LLC_2_PDU_CMD_RR 0x00 /* rx ready cmd */ |
| 134 | #define LLC_2_PDU_RSP_RR 0x00 /* rx ready rsp */ |
| 135 | #define LLC_2_PDU_CMD_REJ 0x08 /* reject PDU cmd */ |
| 136 | #define LLC_2_PDU_RSP_REJ 0x08 /* reject PDU rsp */ |
| 137 | #define LLC_2_PDU_CMD_RNR 0x04 /* rx not ready cmd */ |
| 138 | #define LLC_2_PDU_RSP_RNR 0x04 /* rx not ready rsp */ |
| 139 | |
| 140 | #define LLC_S_PF_BIT_MASK 0x01 |
| 141 | #define LLC_S_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_S_PF_BIT_MASK)) ? 1 : 0) |
| 142 | #define LLC_S_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_S_PF_BIT_MASK) ? 1 : 0) |
| 143 | |
| 144 | #define PDU_SUPV_GET_Nr(pdu) ((pdu->ctrl_2 & 0xFE) >> 1) |
| 145 | #define PDU_GET_NEXT_Vr(sn) (++sn & ~LLC_2_SEQ_NBR_MODULO) |
| 146 | |
| 147 | /* FRMR information field macros */ |
| 148 | |
| 149 | #define FRMR_INFO_LENGTH 5 /* 5 bytes of information */ |
| 150 | |
| 151 | /* |
| 152 | * info is pointer to FRMR info field structure; 'rej_ctrl' is byte pointer |
| 153 | * (if U-PDU) or word pointer to rejected PDU control field |
| 154 | */ |
| 155 | #define FRMR_INFO_SET_REJ_CNTRL(info,rej_ctrl) \ |
| 156 | info->rej_pdu_ctrl = ((*((u8 *) rej_ctrl) & \ |
| 157 | LLC_PDU_TYPE_U) != LLC_PDU_TYPE_U ? \ |
| 158 | (u16)*((u16 *) rej_ctrl) : \ |
| 159 | (((u16) *((u8 *) rej_ctrl)) & 0x00FF)) |
| 160 | |
| 161 | /* |
| 162 | * Info is pointer to FRMR info field structure; 'vs' is a byte containing |
| 163 | * send state variable value in low-order 7 bits (insure the lowest-order |
| 164 | * bit remains zero (0)) |
| 165 | */ |
| 166 | #define FRMR_INFO_SET_Vs(info,vs) (info->curr_ssv = (((u8) vs) << 1)) |
| 167 | #define FRMR_INFO_SET_Vr(info,vr) (info->curr_rsv = (((u8) vr) << 1)) |
| 168 | |
| 169 | /* |
| 170 | * Info is pointer to FRMR info field structure; 'cr' is a byte containing |
| 171 | * the C/R bit value in the low-order bit |
| 172 | */ |
| 173 | #define FRMR_INFO_SET_C_R_BIT(info, cr) (info->curr_rsv |= (((u8) cr) & 0x01)) |
| 174 | |
| 175 | /* |
| 176 | * In the remaining five macros, 'info' is pointer to FRMR info field |
| 177 | * structure; 'ind' is a byte containing the bit value to set in the |
| 178 | * lowest-order bit) |
| 179 | */ |
| 180 | #define FRMR_INFO_SET_INVALID_PDU_CTRL_IND(info, ind) \ |
| 181 | (info->ind_bits = ((info->ind_bits & 0xFE) | (((u8) ind) & 0x01))) |
| 182 | |
| 183 | #define FRMR_INFO_SET_INVALID_PDU_INFO_IND(info, ind) \ |
| 184 | (info->ind_bits = ( (info->ind_bits & 0xFD) | (((u8) ind) & 0x02))) |
| 185 | |
| 186 | #define FRMR_INFO_SET_PDU_INFO_2LONG_IND(info, ind) \ |
| 187 | (info->ind_bits = ( (info->ind_bits & 0xFB) | (((u8) ind) & 0x04))) |
| 188 | |
| 189 | #define FRMR_INFO_SET_PDU_INVALID_Nr_IND(info, ind) \ |
| 190 | (info->ind_bits = ( (info->ind_bits & 0xF7) | (((u8) ind) & 0x08))) |
| 191 | |
| 192 | #define FRMR_INFO_SET_PDU_INVALID_Ns_IND(info, ind) \ |
| 193 | (info->ind_bits = ( (info->ind_bits & 0xEF) | (((u8) ind) & 0x10))) |
| 194 | |
| 195 | /* Sequence-numbered PDU format (4 bytes in length) */ |
| 196 | struct llc_pdu_sn { |
| 197 | u8 dsap; |
| 198 | u8 ssap; |
| 199 | u8 ctrl_1; |
| 200 | u8 ctrl_2; |
Vitalii Demianets | a10e146 | 2011-05-12 23:04:29 +0000 | [diff] [blame] | 201 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | static inline struct llc_pdu_sn *llc_pdu_sn_hdr(struct sk_buff *skb) |
| 204 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 205 | return (struct llc_pdu_sn *)skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | /* Un-numbered PDU format (3 bytes in length) */ |
| 209 | struct llc_pdu_un { |
| 210 | u8 dsap; |
| 211 | u8 ssap; |
| 212 | u8 ctrl_1; |
Vitalii Demianets | a10e146 | 2011-05-12 23:04:29 +0000 | [diff] [blame] | 213 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | static inline struct llc_pdu_un *llc_pdu_un_hdr(struct sk_buff *skb) |
| 216 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 217 | return (struct llc_pdu_un *)skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | /** |
| 221 | * llc_pdu_header_init - initializes pdu header |
| 222 | * @skb: input skb that header must be set into it. |
| 223 | * @type: type of PDU (U, I or S). |
| 224 | * @ssap: source sap. |
| 225 | * @dsap: destination sap. |
| 226 | * @cr: command/response bit (0 or 1). |
| 227 | * |
| 228 | * This function sets DSAP, SSAP and command/Response bit in LLC header. |
| 229 | */ |
| 230 | static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type, |
| 231 | u8 ssap, u8 dsap, u8 cr) |
| 232 | { |
| 233 | const int hlen = type == LLC_PDU_TYPE_U ? 3 : 4; |
Arnaldo Carvalho de Melo | 37e6636 | 2007-03-10 15:34:36 -0300 | [diff] [blame] | 234 | struct llc_pdu_un *pdu; |
| 235 | |
| 236 | skb_push(skb, hlen); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 237 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 37e6636 | 2007-03-10 15:34:36 -0300 | [diff] [blame] | 238 | pdu = llc_pdu_un_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | pdu->dsap = dsap; |
| 240 | pdu->ssap = ssap; |
| 241 | pdu->ssap |= cr; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * llc_pdu_decode_sa - extracs source address (MAC) of input frame |
| 246 | * @skb: input skb that source address must be extracted from it. |
| 247 | * @sa: pointer to source address (6 byte array). |
| 248 | * |
| 249 | * This function extracts source address(MAC) of input frame. |
| 250 | */ |
| 251 | static inline void llc_pdu_decode_sa(struct sk_buff *skb, u8 *sa) |
| 252 | { |
Al Viro | 3fbd418 | 2006-11-08 00:26:05 -0800 | [diff] [blame] | 253 | if (skb->protocol == htons(ETH_P_802_2)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | memcpy(sa, eth_hdr(skb)->h_source, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | |
| 257 | /** |
| 258 | * llc_pdu_decode_da - extracts dest address of input frame |
| 259 | * @skb: input skb that destination address must be extracted from it |
| 260 | * @sa: pointer to destination address (6 byte array). |
| 261 | * |
| 262 | * This function extracts destination address(MAC) of input frame. |
| 263 | */ |
| 264 | static inline void llc_pdu_decode_da(struct sk_buff *skb, u8 *da) |
| 265 | { |
Al Viro | 3fbd418 | 2006-11-08 00:26:05 -0800 | [diff] [blame] | 266 | if (skb->protocol == htons(ETH_P_802_2)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | memcpy(da, eth_hdr(skb)->h_dest, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | /** |
| 271 | * llc_pdu_decode_ssap - extracts source SAP of input frame |
| 272 | * @skb: input skb that source SAP must be extracted from it. |
| 273 | * @ssap: source SAP (output argument). |
| 274 | * |
| 275 | * This function extracts source SAP of input frame. Right bit of SSAP is |
| 276 | * command/response bit. |
| 277 | */ |
| 278 | static inline void llc_pdu_decode_ssap(struct sk_buff *skb, u8 *ssap) |
| 279 | { |
| 280 | *ssap = llc_pdu_un_hdr(skb)->ssap & 0xFE; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * llc_pdu_decode_dsap - extracts dest SAP of input frame |
| 285 | * @skb: input skb that destination SAP must be extracted from it. |
| 286 | * @dsap: destination SAP (output argument). |
| 287 | * |
| 288 | * This function extracts destination SAP of input frame. right bit of |
| 289 | * DSAP designates individual/group SAP. |
| 290 | */ |
| 291 | static inline void llc_pdu_decode_dsap(struct sk_buff *skb, u8 *dsap) |
| 292 | { |
| 293 | *dsap = llc_pdu_un_hdr(skb)->dsap & 0xFE; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * llc_pdu_init_as_ui_cmd - sets LLC header as UI PDU |
| 298 | * @skb: input skb that header must be set into it. |
| 299 | * |
| 300 | * This function sets third byte of LLC header as a UI PDU. |
| 301 | */ |
| 302 | static inline void llc_pdu_init_as_ui_cmd(struct sk_buff *skb) |
| 303 | { |
| 304 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 305 | |
| 306 | pdu->ctrl_1 = LLC_PDU_TYPE_U; |
| 307 | pdu->ctrl_1 |= LLC_1_PDU_CMD_UI; |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * llc_pdu_init_as_test_cmd - sets PDU as TEST |
| 312 | * @skb - Address of the skb to build |
| 313 | * |
| 314 | * Sets a PDU as TEST |
| 315 | */ |
| 316 | static inline void llc_pdu_init_as_test_cmd(struct sk_buff *skb) |
| 317 | { |
| 318 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 319 | |
| 320 | pdu->ctrl_1 = LLC_PDU_TYPE_U; |
| 321 | pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST; |
| 322 | pdu->ctrl_1 |= LLC_U_PF_BIT_MASK; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * llc_pdu_init_as_test_rsp - build TEST response PDU |
| 327 | * @skb: Address of the skb to build |
| 328 | * @ev_skb: The received TEST command PDU frame |
| 329 | * |
| 330 | * Builds a pdu frame as a TEST response. |
| 331 | */ |
| 332 | static inline void llc_pdu_init_as_test_rsp(struct sk_buff *skb, |
| 333 | struct sk_buff *ev_skb) |
| 334 | { |
| 335 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 336 | |
| 337 | pdu->ctrl_1 = LLC_PDU_TYPE_U; |
| 338 | pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST; |
| 339 | pdu->ctrl_1 |= LLC_U_PF_BIT_MASK; |
Al Viro | 3fbd418 | 2006-11-08 00:26:05 -0800 | [diff] [blame] | 340 | if (ev_skb->protocol == htons(ETH_P_802_2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | struct llc_pdu_un *ev_pdu = llc_pdu_un_hdr(ev_skb); |
| 342 | int dsize; |
| 343 | |
| 344 | dsize = ntohs(eth_hdr(ev_skb)->h_proto) - 3; |
| 345 | memcpy(((u8 *)pdu) + 3, ((u8 *)ev_pdu) + 3, dsize); |
| 346 | skb_put(skb, dsize); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | /* LLC Type 1 XID command/response information fields format */ |
| 351 | struct llc_xid_info { |
Jochen Friedrich | cf22535 | 2005-11-14 21:58:18 -0800 | [diff] [blame] | 352 | u8 fmt_id; /* always 0x81 for LLC */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | u8 type; /* different if NULL/non-NULL LSAP */ |
| 354 | u8 rw; /* sender receive window */ |
Vitalii Demianets | a10e146 | 2011-05-12 23:04:29 +0000 | [diff] [blame] | 355 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | /** |
| 358 | * llc_pdu_init_as_xid_cmd - sets bytes 3, 4 & 5 of LLC header as XID |
| 359 | * @skb: input skb that header must be set into it. |
| 360 | * |
| 361 | * This function sets third,fourth,fifth and sixth bytes of LLC header as |
| 362 | * a XID PDU. |
| 363 | */ |
| 364 | static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb, |
| 365 | u8 svcs_supported, u8 rx_window) |
| 366 | { |
| 367 | struct llc_xid_info *xid_info; |
| 368 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 369 | |
| 370 | pdu->ctrl_1 = LLC_PDU_TYPE_U; |
| 371 | pdu->ctrl_1 |= LLC_1_PDU_CMD_XID; |
| 372 | pdu->ctrl_1 |= LLC_U_PF_BIT_MASK; |
| 373 | xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1); |
| 374 | xid_info->fmt_id = LLC_XID_FMT_ID; /* 0x81 */ |
| 375 | xid_info->type = svcs_supported; |
| 376 | xid_info->rw = rx_window << 1; /* size of receive window */ |
Joonwoo Park | f83f176 | 2008-03-31 21:02:47 -0700 | [diff] [blame] | 377 | skb_put(skb, sizeof(struct llc_xid_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | /** |
| 381 | * llc_pdu_init_as_xid_rsp - builds XID response PDU |
| 382 | * @skb: Address of the skb to build |
| 383 | * @svcs_supported: The class of the LLC (I or II) |
| 384 | * @rx_window: The size of the receive window of the LLC |
| 385 | * |
| 386 | * Builds a pdu frame as an XID response. |
| 387 | */ |
| 388 | static inline void llc_pdu_init_as_xid_rsp(struct sk_buff *skb, |
| 389 | u8 svcs_supported, u8 rx_window) |
| 390 | { |
| 391 | struct llc_xid_info *xid_info; |
| 392 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 393 | |
| 394 | pdu->ctrl_1 = LLC_PDU_TYPE_U; |
| 395 | pdu->ctrl_1 |= LLC_1_PDU_CMD_XID; |
| 396 | pdu->ctrl_1 |= LLC_U_PF_BIT_MASK; |
| 397 | |
| 398 | xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1); |
| 399 | xid_info->fmt_id = LLC_XID_FMT_ID; |
| 400 | xid_info->type = svcs_supported; |
| 401 | xid_info->rw = rx_window << 1; |
Joonwoo Park | f83f176 | 2008-03-31 21:02:47 -0700 | [diff] [blame] | 402 | skb_put(skb, sizeof(struct llc_xid_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | /* LLC Type 2 FRMR response information field format */ |
| 406 | struct llc_frmr_info { |
| 407 | u16 rej_pdu_ctrl; /* bits 1-8 if U-PDU */ |
| 408 | u8 curr_ssv; /* current send state variable val */ |
| 409 | u8 curr_rsv; /* current receive state variable */ |
| 410 | u8 ind_bits; /* indicator bits set with macro */ |
Vitalii Demianets | a10e146 | 2011-05-12 23:04:29 +0000 | [diff] [blame] | 411 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Joe Perches | bf3c710 | 2013-09-21 10:22:45 -0700 | [diff] [blame] | 413 | void llc_pdu_set_cmd_rsp(struct sk_buff *skb, u8 type); |
| 414 | void llc_pdu_set_pf_bit(struct sk_buff *skb, u8 bit_value); |
| 415 | void llc_pdu_decode_pf_bit(struct sk_buff *skb, u8 *pf_bit); |
| 416 | void llc_pdu_init_as_disc_cmd(struct sk_buff *skb, u8 p_bit); |
| 417 | void llc_pdu_init_as_i_cmd(struct sk_buff *skb, u8 p_bit, u8 ns, u8 nr); |
| 418 | void llc_pdu_init_as_rej_cmd(struct sk_buff *skb, u8 p_bit, u8 nr); |
| 419 | void llc_pdu_init_as_rnr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr); |
| 420 | void llc_pdu_init_as_rr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr); |
| 421 | void llc_pdu_init_as_sabme_cmd(struct sk_buff *skb, u8 p_bit); |
| 422 | void llc_pdu_init_as_dm_rsp(struct sk_buff *skb, u8 f_bit); |
| 423 | void llc_pdu_init_as_frmr_rsp(struct sk_buff *skb, struct llc_pdu_sn *prev_pdu, |
| 424 | u8 f_bit, u8 vs, u8 vr, u8 vzyxw); |
| 425 | void llc_pdu_init_as_rr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr); |
| 426 | void llc_pdu_init_as_rej_rsp(struct sk_buff *skb, u8 f_bit, u8 nr); |
| 427 | void llc_pdu_init_as_rnr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr); |
| 428 | void llc_pdu_init_as_ua_rsp(struct sk_buff *skb, u8 f_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | #endif /* LLC_PDU_H */ |