| 1 | /* |
| 2 | * llc_c_ac.c - actions performed during connection state transition. |
| 3 | * |
| 4 | * Description: |
| 5 | * Functions in this module are implementation of connection component actions |
| 6 | * Details of actions can be found in IEEE-802.2 standard document. |
| 7 | * All functions have one connection and one event as input argument. All of |
| 8 | * them return 0 On success and 1 otherwise. |
| 9 | * |
| 10 | * Copyright (c) 1997 by Procom Technology, Inc. |
| 11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 12 | * |
| 13 | * This program can be redistributed or modified under the terms of the |
| 14 | * GNU General Public License as published by the Free Software Foundation. |
| 15 | * This program is distributed without any warranty or implied warranty |
| 16 | * of merchantability or fitness for a particular purpose. |
| 17 | * |
| 18 | * See the GNU General Public License for more details. |
| 19 | */ |
| 20 | #include <linux/netdevice.h> |
| 21 | #include <net/llc_conn.h> |
| 22 | #include <net/llc_sap.h> |
| 23 | #include <net/sock.h> |
| 24 | #include <net/llc_c_ev.h> |
| 25 | #include <net/llc_c_ac.h> |
| 26 | #include <net/llc_c_st.h> |
| 27 | #include <net/llc_pdu.h> |
| 28 | #include <net/llc.h> |
| 29 | |
| 30 | |
| 31 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); |
| 32 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); |
| 33 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); |
| 34 | |
| 35 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); |
| 36 | |
| 37 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, |
| 38 | struct sk_buff *skb); |
| 39 | |
| 40 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); |
| 41 | |
| 42 | #define INCORRECT 0 |
| 43 | |
| 44 | int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) |
| 45 | { |
| 46 | struct llc_sock *llc = llc_sk(sk); |
| 47 | |
| 48 | if (llc->remote_busy_flag) { |
| 49 | u8 nr; |
| 50 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 51 | |
| 52 | llc->remote_busy_flag = 0; |
| 53 | del_timer(&llc->busy_state_timer.timer); |
| 54 | nr = LLC_I_GET_NR(pdu); |
| 55 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
| 56 | } |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) |
| 61 | { |
| 62 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 63 | |
| 64 | ev->ind_prim = LLC_CONN_PRIM; |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) |
| 69 | { |
| 70 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 71 | |
| 72 | ev->cfm_prim = LLC_CONN_PRIM; |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) |
| 77 | { |
| 78 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 79 | |
| 80 | ev->cfm_prim = LLC_DATA_PRIM; |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) |
| 85 | { |
| 86 | llc_conn_rtn_pdu(sk, skb); |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) |
| 91 | { |
| 92 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 93 | u8 reason = 0; |
| 94 | int rc = 0; |
| 95 | |
| 96 | if (ev->type == LLC_CONN_EV_TYPE_PDU) { |
| 97 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 98 | |
| 99 | if (LLC_PDU_IS_RSP(pdu) && |
| 100 | LLC_PDU_TYPE_IS_U(pdu) && |
| 101 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) |
| 102 | reason = LLC_DISC_REASON_RX_DM_RSP_PDU; |
| 103 | else if (LLC_PDU_IS_CMD(pdu) && |
| 104 | LLC_PDU_TYPE_IS_U(pdu) && |
| 105 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) |
| 106 | reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; |
| 107 | } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) |
| 108 | reason = LLC_DISC_REASON_ACK_TMR_EXP; |
| 109 | else |
| 110 | rc = -EINVAL; |
| 111 | if (!rc) { |
| 112 | ev->reason = reason; |
| 113 | ev->ind_prim = LLC_DISC_PRIM; |
| 114 | } |
| 115 | return rc; |
| 116 | } |
| 117 | |
| 118 | int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) |
| 119 | { |
| 120 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 121 | |
| 122 | ev->reason = ev->status; |
| 123 | ev->cfm_prim = LLC_DISC_PRIM; |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) |
| 128 | { |
| 129 | u8 reason = 0; |
| 130 | int rc = 1; |
| 131 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 132 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
| 133 | struct llc_sock *llc = llc_sk(sk); |
| 134 | |
| 135 | switch (ev->type) { |
| 136 | case LLC_CONN_EV_TYPE_PDU: |
| 137 | if (LLC_PDU_IS_RSP(pdu) && |
| 138 | LLC_PDU_TYPE_IS_U(pdu) && |
| 139 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { |
| 140 | reason = LLC_RESET_REASON_LOCAL; |
| 141 | rc = 0; |
| 142 | } else if (LLC_PDU_IS_CMD(pdu) && |
| 143 | LLC_PDU_TYPE_IS_U(pdu) && |
| 144 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { |
| 145 | reason = LLC_RESET_REASON_REMOTE; |
| 146 | rc = 0; |
| 147 | } |
| 148 | break; |
| 149 | case LLC_CONN_EV_TYPE_ACK_TMR: |
| 150 | case LLC_CONN_EV_TYPE_P_TMR: |
| 151 | case LLC_CONN_EV_TYPE_REJ_TMR: |
| 152 | case LLC_CONN_EV_TYPE_BUSY_TMR: |
| 153 | if (llc->retry_count > llc->n2) { |
| 154 | reason = LLC_RESET_REASON_LOCAL; |
| 155 | rc = 0; |
| 156 | } |
| 157 | break; |
| 158 | } |
| 159 | if (!rc) { |
| 160 | ev->reason = reason; |
| 161 | ev->ind_prim = LLC_RESET_PRIM; |
| 162 | } |
| 163 | return rc; |
| 164 | } |
| 165 | |
| 166 | int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) |
| 167 | { |
| 168 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 169 | |
| 170 | ev->reason = 0; |
| 171 | ev->cfm_prim = LLC_RESET_PRIM; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, |
| 176 | struct sk_buff *skb) |
| 177 | { |
| 178 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 179 | |
| 180 | if (LLC_PDU_IS_RSP(pdu) && |
| 181 | LLC_PDU_TYPE_IS_I(pdu) && |
| 182 | LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf) |
| 183 | llc_conn_ac_clear_remote_busy(sk, skb); |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, |
| 188 | struct sk_buff *skb) |
| 189 | { |
| 190 | struct llc_sock *llc = llc_sk(sk); |
| 191 | |
| 192 | if (llc->data_flag == 2) |
| 193 | del_timer(&llc->rej_sent_timer.timer); |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) |
| 198 | { |
| 199 | int rc = -ENOBUFS; |
| 200 | struct llc_sock *llc = llc_sk(sk); |
| 201 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 202 | |
| 203 | if (nskb) { |
| 204 | struct llc_sap *sap = llc->sap; |
| 205 | |
| 206 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 207 | llc->daddr.lsap, LLC_PDU_CMD); |
| 208 | llc_pdu_init_as_disc_cmd(nskb, 1); |
| 209 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 210 | if (unlikely(rc)) |
| 211 | goto free; |
| 212 | llc_conn_send_pdu(sk, nskb); |
| 213 | llc_conn_ac_set_p_flag_1(sk, skb); |
| 214 | } |
| 215 | out: |
| 216 | return rc; |
| 217 | free: |
| 218 | kfree_skb(nskb); |
| 219 | goto out; |
| 220 | } |
| 221 | |
| 222 | int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) |
| 223 | { |
| 224 | int rc = -ENOBUFS; |
| 225 | struct llc_sock *llc = llc_sk(sk); |
| 226 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 227 | |
| 228 | if (nskb) { |
| 229 | struct llc_sap *sap = llc->sap; |
| 230 | u8 f_bit; |
| 231 | |
| 232 | llc_pdu_decode_pf_bit(skb, &f_bit); |
| 233 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 234 | llc->daddr.lsap, LLC_PDU_RSP); |
| 235 | llc_pdu_init_as_dm_rsp(nskb, f_bit); |
| 236 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 237 | if (unlikely(rc)) |
| 238 | goto free; |
| 239 | llc_conn_send_pdu(sk, nskb); |
| 240 | } |
| 241 | out: |
| 242 | return rc; |
| 243 | free: |
| 244 | kfree_skb(nskb); |
| 245 | goto out; |
| 246 | } |
| 247 | |
| 248 | int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
| 249 | { |
| 250 | int rc = -ENOBUFS; |
| 251 | struct llc_sock *llc = llc_sk(sk); |
| 252 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 253 | |
| 254 | if (nskb) { |
| 255 | struct llc_sap *sap = llc->sap; |
| 256 | |
| 257 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 258 | llc->daddr.lsap, LLC_PDU_RSP); |
| 259 | llc_pdu_init_as_dm_rsp(nskb, 1); |
| 260 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 261 | if (unlikely(rc)) |
| 262 | goto free; |
| 263 | llc_conn_send_pdu(sk, nskb); |
| 264 | } |
| 265 | out: |
| 266 | return rc; |
| 267 | free: |
| 268 | kfree_skb(nskb); |
| 269 | goto out; |
| 270 | } |
| 271 | |
| 272 | int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) |
| 273 | { |
| 274 | u8 f_bit; |
| 275 | int rc = -ENOBUFS; |
| 276 | struct sk_buff *nskb; |
| 277 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 278 | struct llc_sock *llc = llc_sk(sk); |
| 279 | |
| 280 | llc->rx_pdu_hdr = *((u32 *)pdu); |
| 281 | if (LLC_PDU_IS_CMD(pdu)) |
| 282 | llc_pdu_decode_pf_bit(skb, &f_bit); |
| 283 | else |
| 284 | f_bit = 0; |
| 285 | nskb = llc_alloc_frame(sk, llc->dev); |
| 286 | if (nskb) { |
| 287 | struct llc_sap *sap = llc->sap; |
| 288 | |
| 289 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 290 | llc->daddr.lsap, LLC_PDU_RSP); |
| 291 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, |
| 292 | llc->vR, INCORRECT); |
| 293 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 294 | if (unlikely(rc)) |
| 295 | goto free; |
| 296 | llc_conn_send_pdu(sk, nskb); |
| 297 | } |
| 298 | out: |
| 299 | return rc; |
| 300 | free: |
| 301 | kfree_skb(nskb); |
| 302 | goto out; |
| 303 | } |
| 304 | |
| 305 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) |
| 306 | { |
| 307 | int rc = -ENOBUFS; |
| 308 | struct llc_sock *llc = llc_sk(sk); |
| 309 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 310 | |
| 311 | if (nskb) { |
| 312 | struct llc_sap *sap = llc->sap; |
| 313 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; |
| 314 | |
| 315 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 316 | llc->daddr.lsap, LLC_PDU_RSP); |
| 317 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
| 318 | llc->vR, INCORRECT); |
| 319 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 320 | if (unlikely(rc)) |
| 321 | goto free; |
| 322 | llc_conn_send_pdu(sk, nskb); |
| 323 | } |
| 324 | out: |
| 325 | return rc; |
| 326 | free: |
| 327 | kfree_skb(nskb); |
| 328 | goto out; |
| 329 | } |
| 330 | |
| 331 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) |
| 332 | { |
| 333 | u8 f_bit; |
| 334 | int rc = -ENOBUFS; |
| 335 | struct sk_buff *nskb; |
| 336 | struct llc_sock *llc = llc_sk(sk); |
| 337 | |
| 338 | llc_pdu_decode_pf_bit(skb, &f_bit); |
| 339 | nskb = llc_alloc_frame(sk, llc->dev); |
| 340 | if (nskb) { |
| 341 | struct llc_sap *sap = llc->sap; |
| 342 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 343 | |
| 344 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 345 | llc->daddr.lsap, LLC_PDU_RSP); |
| 346 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, |
| 347 | llc->vR, INCORRECT); |
| 348 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 349 | if (unlikely(rc)) |
| 350 | goto free; |
| 351 | llc_conn_send_pdu(sk, nskb); |
| 352 | } |
| 353 | out: |
| 354 | return rc; |
| 355 | free: |
| 356 | kfree_skb(nskb); |
| 357 | goto out; |
| 358 | } |
| 359 | |
| 360 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
| 361 | { |
| 362 | int rc; |
| 363 | struct llc_sock *llc = llc_sk(sk); |
| 364 | struct llc_sap *sap = llc->sap; |
| 365 | |
| 366 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
| 367 | llc->daddr.lsap, LLC_PDU_CMD); |
| 368 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); |
| 369 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
| 370 | if (likely(!rc)) { |
| 371 | llc_conn_send_pdu(sk, skb); |
| 372 | llc_conn_ac_inc_vs_by_1(sk, skb); |
| 373 | } |
| 374 | return rc; |
| 375 | } |
| 376 | |
| 377 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) |
| 378 | { |
| 379 | int rc; |
| 380 | struct llc_sock *llc = llc_sk(sk); |
| 381 | struct llc_sap *sap = llc->sap; |
| 382 | |
| 383 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
| 384 | llc->daddr.lsap, LLC_PDU_CMD); |
| 385 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); |
| 386 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
| 387 | if (likely(!rc)) { |
| 388 | llc_conn_send_pdu(sk, skb); |
| 389 | llc_conn_ac_inc_vs_by_1(sk, skb); |
| 390 | } |
| 391 | return rc; |
| 392 | } |
| 393 | |
| 394 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 395 | { |
| 396 | int rc; |
| 397 | struct llc_sock *llc = llc_sk(sk); |
| 398 | struct llc_sap *sap = llc->sap; |
| 399 | |
| 400 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
| 401 | llc->daddr.lsap, LLC_PDU_CMD); |
| 402 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); |
| 403 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
| 404 | if (likely(!rc)) { |
| 405 | llc_conn_send_pdu(sk, skb); |
| 406 | llc_conn_ac_inc_vs_by_1(sk, skb); |
| 407 | } |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 412 | { |
| 413 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 414 | u8 nr = LLC_I_GET_NR(pdu); |
| 415 | |
| 416 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, |
| 421 | struct sk_buff *skb) |
| 422 | { |
| 423 | u8 nr; |
| 424 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 425 | int rc = -ENOBUFS; |
| 426 | struct llc_sock *llc = llc_sk(sk); |
| 427 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 428 | |
| 429 | if (nskb) { |
| 430 | struct llc_sap *sap = llc->sap; |
| 431 | |
| 432 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 433 | llc->daddr.lsap, LLC_PDU_RSP); |
| 434 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); |
| 435 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 436 | if (likely(!rc)) |
| 437 | llc_conn_send_pdu(sk, nskb); |
| 438 | else |
| 439 | kfree_skb(skb); |
| 440 | } |
| 441 | if (rc) { |
| 442 | nr = LLC_I_GET_NR(pdu); |
| 443 | rc = 0; |
| 444 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
| 445 | } |
| 446 | return rc; |
| 447 | } |
| 448 | |
| 449 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
| 450 | { |
| 451 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 452 | u8 nr = LLC_I_GET_NR(pdu); |
| 453 | |
| 454 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
| 459 | { |
| 460 | int rc = -ENOBUFS; |
| 461 | struct llc_sock *llc = llc_sk(sk); |
| 462 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 463 | |
| 464 | if (nskb) { |
| 465 | struct llc_sap *sap = llc->sap; |
| 466 | |
| 467 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 468 | llc->daddr.lsap, LLC_PDU_CMD); |
| 469 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); |
| 470 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 471 | if (unlikely(rc)) |
| 472 | goto free; |
| 473 | llc_conn_send_pdu(sk, nskb); |
| 474 | } |
| 475 | out: |
| 476 | return rc; |
| 477 | free: |
| 478 | kfree_skb(nskb); |
| 479 | goto out; |
| 480 | } |
| 481 | |
| 482 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
| 483 | { |
| 484 | int rc = -ENOBUFS; |
| 485 | struct llc_sock *llc = llc_sk(sk); |
| 486 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 487 | |
| 488 | if (nskb) { |
| 489 | struct llc_sap *sap = llc->sap; |
| 490 | |
| 491 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 492 | llc->daddr.lsap, LLC_PDU_RSP); |
| 493 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
| 494 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 495 | if (unlikely(rc)) |
| 496 | goto free; |
| 497 | llc_conn_send_pdu(sk, nskb); |
| 498 | } |
| 499 | out: |
| 500 | return rc; |
| 501 | free: |
| 502 | kfree_skb(nskb); |
| 503 | goto out; |
| 504 | } |
| 505 | |
| 506 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 507 | { |
| 508 | int rc = -ENOBUFS; |
| 509 | struct llc_sock *llc = llc_sk(sk); |
| 510 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 511 | |
| 512 | if (nskb) { |
| 513 | struct llc_sap *sap = llc->sap; |
| 514 | |
| 515 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 516 | llc->daddr.lsap, LLC_PDU_RSP); |
| 517 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
| 518 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 519 | if (unlikely(rc)) |
| 520 | goto free; |
| 521 | llc_conn_send_pdu(sk, nskb); |
| 522 | } |
| 523 | out: |
| 524 | return rc; |
| 525 | free: |
| 526 | kfree_skb(nskb); |
| 527 | goto out; |
| 528 | } |
| 529 | |
| 530 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
| 531 | { |
| 532 | int rc = -ENOBUFS; |
| 533 | struct llc_sock *llc = llc_sk(sk); |
| 534 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 535 | |
| 536 | if (nskb) { |
| 537 | struct llc_sap *sap = llc->sap; |
| 538 | |
| 539 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 540 | llc->daddr.lsap, LLC_PDU_CMD); |
| 541 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); |
| 542 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 543 | if (unlikely(rc)) |
| 544 | goto free; |
| 545 | llc_conn_send_pdu(sk, nskb); |
| 546 | } |
| 547 | out: |
| 548 | return rc; |
| 549 | free: |
| 550 | kfree_skb(nskb); |
| 551 | goto out; |
| 552 | } |
| 553 | |
| 554 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
| 555 | { |
| 556 | int rc = -ENOBUFS; |
| 557 | struct llc_sock *llc = llc_sk(sk); |
| 558 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 559 | |
| 560 | if (nskb) { |
| 561 | struct llc_sap *sap = llc->sap; |
| 562 | |
| 563 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 564 | llc->daddr.lsap, LLC_PDU_RSP); |
| 565 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
| 566 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 567 | if (unlikely(rc)) |
| 568 | goto free; |
| 569 | llc_conn_send_pdu(sk, nskb); |
| 570 | } |
| 571 | out: |
| 572 | return rc; |
| 573 | free: |
| 574 | kfree_skb(nskb); |
| 575 | goto out; |
| 576 | } |
| 577 | |
| 578 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 579 | { |
| 580 | int rc = -ENOBUFS; |
| 581 | struct llc_sock *llc = llc_sk(sk); |
| 582 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 583 | |
| 584 | if (nskb) { |
| 585 | struct llc_sap *sap = llc->sap; |
| 586 | |
| 587 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 588 | llc->daddr.lsap, LLC_PDU_RSP); |
| 589 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
| 590 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 591 | if (unlikely(rc)) |
| 592 | goto free; |
| 593 | llc_conn_send_pdu(sk, nskb); |
| 594 | } |
| 595 | out: |
| 596 | return rc; |
| 597 | free: |
| 598 | kfree_skb(nskb); |
| 599 | goto out; |
| 600 | } |
| 601 | |
| 602 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) |
| 603 | { |
| 604 | struct llc_sock *llc = llc_sk(sk); |
| 605 | |
| 606 | if (!llc->remote_busy_flag) { |
| 607 | llc->remote_busy_flag = 1; |
| 608 | mod_timer(&llc->busy_state_timer.timer, |
| 609 | jiffies + llc->busy_state_timer.expire); |
| 610 | } |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 615 | { |
| 616 | int rc = -ENOBUFS; |
| 617 | struct llc_sock *llc = llc_sk(sk); |
| 618 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 619 | |
| 620 | if (nskb) { |
| 621 | struct llc_sap *sap = llc->sap; |
| 622 | |
| 623 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 624 | llc->daddr.lsap, LLC_PDU_RSP); |
| 625 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
| 626 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 627 | if (unlikely(rc)) |
| 628 | goto free; |
| 629 | llc_conn_send_pdu(sk, nskb); |
| 630 | } |
| 631 | out: |
| 632 | return rc; |
| 633 | free: |
| 634 | kfree_skb(nskb); |
| 635 | goto out; |
| 636 | } |
| 637 | |
| 638 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
| 639 | { |
| 640 | int rc = -ENOBUFS; |
| 641 | struct llc_sock *llc = llc_sk(sk); |
| 642 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 643 | |
| 644 | if (nskb) { |
| 645 | struct llc_sap *sap = llc->sap; |
| 646 | |
| 647 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 648 | llc->daddr.lsap, LLC_PDU_CMD); |
| 649 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); |
| 650 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 651 | if (unlikely(rc)) |
| 652 | goto free; |
| 653 | llc_conn_send_pdu(sk, nskb); |
| 654 | } |
| 655 | out: |
| 656 | return rc; |
| 657 | free: |
| 658 | kfree_skb(nskb); |
| 659 | goto out; |
| 660 | } |
| 661 | |
| 662 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
| 663 | { |
| 664 | int rc = -ENOBUFS; |
| 665 | struct llc_sock *llc = llc_sk(sk); |
| 666 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 667 | |
| 668 | if (nskb) { |
| 669 | struct llc_sap *sap = llc->sap; |
| 670 | u8 f_bit = 1; |
| 671 | |
| 672 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 673 | llc->daddr.lsap, LLC_PDU_RSP); |
| 674 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); |
| 675 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 676 | if (unlikely(rc)) |
| 677 | goto free; |
| 678 | llc_conn_send_pdu(sk, nskb); |
| 679 | } |
| 680 | out: |
| 681 | return rc; |
| 682 | free: |
| 683 | kfree_skb(nskb); |
| 684 | goto out; |
| 685 | } |
| 686 | |
| 687 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
| 688 | { |
| 689 | int rc = -ENOBUFS; |
| 690 | struct llc_sock *llc = llc_sk(sk); |
| 691 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 692 | |
| 693 | if (nskb) { |
| 694 | struct llc_sap *sap = llc->sap; |
| 695 | |
| 696 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 697 | llc->daddr.lsap, LLC_PDU_RSP); |
| 698 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
| 699 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 700 | if (unlikely(rc)) |
| 701 | goto free; |
| 702 | llc_conn_send_pdu(sk, nskb); |
| 703 | } |
| 704 | out: |
| 705 | return rc; |
| 706 | free: |
| 707 | kfree_skb(nskb); |
| 708 | goto out; |
| 709 | } |
| 710 | |
| 711 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 712 | { |
| 713 | int rc = -ENOBUFS; |
| 714 | struct llc_sock *llc = llc_sk(sk); |
| 715 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 716 | |
| 717 | if (nskb) { |
| 718 | struct llc_sap *sap = llc->sap; |
| 719 | |
| 720 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 721 | llc->daddr.lsap, LLC_PDU_RSP); |
| 722 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); |
| 723 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 724 | if (unlikely(rc)) |
| 725 | goto free; |
| 726 | llc_conn_send_pdu(sk, nskb); |
| 727 | } |
| 728 | out: |
| 729 | return rc; |
| 730 | free: |
| 731 | kfree_skb(nskb); |
| 732 | goto out; |
| 733 | } |
| 734 | |
| 735 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
| 736 | { |
| 737 | int rc = -ENOBUFS; |
| 738 | struct llc_sock *llc = llc_sk(sk); |
| 739 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 740 | |
| 741 | if (nskb) { |
| 742 | struct llc_sap *sap = llc->sap; |
| 743 | |
| 744 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 745 | llc->daddr.lsap, LLC_PDU_RSP); |
| 746 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); |
| 747 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 748 | if (unlikely(rc)) |
| 749 | goto free; |
| 750 | llc_conn_send_pdu(sk, nskb); |
| 751 | } |
| 752 | out: |
| 753 | return rc; |
| 754 | free: |
| 755 | kfree_skb(nskb); |
| 756 | goto out; |
| 757 | } |
| 758 | |
| 759 | void llc_conn_set_p_flag(struct sock *sk, u8 value) |
| 760 | { |
| 761 | int state_changed = llc_sk(sk)->p_flag && !value; |
| 762 | |
| 763 | llc_sk(sk)->p_flag = value; |
| 764 | |
| 765 | if (state_changed) |
| 766 | sk->sk_state_change(sk); |
| 767 | } |
| 768 | |
| 769 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) |
| 770 | { |
| 771 | int rc = -ENOBUFS; |
| 772 | struct llc_sock *llc = llc_sk(sk); |
| 773 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 774 | |
| 775 | if (nskb) { |
| 776 | struct llc_sap *sap = llc->sap; |
| 777 | u8 *dmac = llc->daddr.mac; |
| 778 | |
| 779 | if (llc->dev->flags & IFF_LOOPBACK) |
| 780 | dmac = llc->dev->dev_addr; |
| 781 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 782 | llc->daddr.lsap, LLC_PDU_CMD); |
| 783 | llc_pdu_init_as_sabme_cmd(nskb, 1); |
| 784 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); |
| 785 | if (unlikely(rc)) |
| 786 | goto free; |
| 787 | llc_conn_send_pdu(sk, nskb); |
| 788 | llc_conn_set_p_flag(sk, 1); |
| 789 | } |
| 790 | out: |
| 791 | return rc; |
| 792 | free: |
| 793 | kfree_skb(nskb); |
| 794 | goto out; |
| 795 | } |
| 796 | |
| 797 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) |
| 798 | { |
| 799 | u8 f_bit; |
| 800 | int rc = -ENOBUFS; |
| 801 | struct llc_sock *llc = llc_sk(sk); |
| 802 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 803 | |
| 804 | llc_pdu_decode_pf_bit(skb, &f_bit); |
| 805 | if (nskb) { |
| 806 | struct llc_sap *sap = llc->sap; |
| 807 | |
| 808 | nskb->dev = llc->dev; |
| 809 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
| 810 | llc->daddr.lsap, LLC_PDU_RSP); |
| 811 | llc_pdu_init_as_ua_rsp(nskb, f_bit); |
| 812 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 813 | if (unlikely(rc)) |
| 814 | goto free; |
| 815 | llc_conn_send_pdu(sk, nskb); |
| 816 | } |
| 817 | out: |
| 818 | return rc; |
| 819 | free: |
| 820 | kfree_skb(nskb); |
| 821 | goto out; |
| 822 | } |
| 823 | |
| 824 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) |
| 825 | { |
| 826 | llc_sk(sk)->s_flag = 0; |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) |
| 831 | { |
| 832 | llc_sk(sk)->s_flag = 1; |
| 833 | return 0; |
| 834 | } |
| 835 | |
| 836 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) |
| 837 | { |
| 838 | struct llc_sock *llc = llc_sk(sk); |
| 839 | |
| 840 | llc_conn_set_p_flag(sk, 1); |
| 841 | mod_timer(&llc->pf_cycle_timer.timer, |
| 842 | jiffies + llc->pf_cycle_timer.expire); |
| 843 | return 0; |
| 844 | } |
| 845 | |
| 846 | /** |
| 847 | * llc_conn_ac_send_ack_if_needed - check if ack is needed |
| 848 | * @sk: current connection structure |
| 849 | * @skb: current event |
| 850 | * |
| 851 | * Checks number of received PDUs which have not been acknowledged, yet, |
| 852 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then |
| 853 | * sends an RR response as acknowledgement for them. Returns 0 for |
| 854 | * success, 1 otherwise. |
| 855 | */ |
| 856 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) |
| 857 | { |
| 858 | u8 pf_bit; |
| 859 | struct llc_sock *llc = llc_sk(sk); |
| 860 | |
| 861 | llc_pdu_decode_pf_bit(skb, &pf_bit); |
| 862 | llc->ack_pf |= pf_bit & 1; |
| 863 | if (!llc->ack_must_be_send) { |
| 864 | llc->first_pdu_Ns = llc->vR; |
| 865 | llc->ack_must_be_send = 1; |
| 866 | llc->ack_pf = pf_bit & 1; |
| 867 | } |
| 868 | if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO) |
| 869 | % LLC_2_SEQ_NBR_MODULO) >= llc->npta) { |
| 870 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); |
| 871 | llc->ack_must_be_send = 0; |
| 872 | llc->ack_pf = 0; |
| 873 | llc_conn_ac_inc_npta_value(sk, skb); |
| 874 | } |
| 875 | return 0; |
| 876 | } |
| 877 | |
| 878 | /** |
| 879 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag |
| 880 | * @sk: current connection structure |
| 881 | * @skb: current event |
| 882 | * |
| 883 | * This action resets ack_must_be_send flag of given connection, this flag |
| 884 | * indicates if there is any PDU which has not been acknowledged yet. |
| 885 | * Returns 0 for success, 1 otherwise. |
| 886 | */ |
| 887 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) |
| 888 | { |
| 889 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; |
| 890 | return 0; |
| 891 | } |
| 892 | |
| 893 | /** |
| 894 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs |
| 895 | * @sk: current connection structure |
| 896 | * @skb: current event |
| 897 | * |
| 898 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to |
| 899 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is |
| 900 | * set to one if one PDU with p-bit set to one is received. Returns 0 for |
| 901 | * success, 1 otherwise. |
| 902 | */ |
| 903 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, |
| 904 | struct sk_buff *skb) |
| 905 | { |
| 906 | int rc; |
| 907 | struct llc_sock *llc = llc_sk(sk); |
| 908 | struct llc_sap *sap = llc->sap; |
| 909 | |
| 910 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
| 911 | llc->daddr.lsap, LLC_PDU_RSP); |
| 912 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); |
| 913 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
| 914 | if (likely(!rc)) { |
| 915 | llc_conn_send_pdu(sk, skb); |
| 916 | llc_conn_ac_inc_vs_by_1(sk, skb); |
| 917 | } |
| 918 | return rc; |
| 919 | } |
| 920 | |
| 921 | /** |
| 922 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs |
| 923 | * @sk: current connection structure. |
| 924 | * @skb: current event. |
| 925 | * |
| 926 | * This action sends an I-format PDU as acknowledge to received PDUs which |
| 927 | * have not been acknowledged, yet, if there is any. By using of this |
| 928 | * action number of acknowledgements decreases, this technic is called |
| 929 | * piggy backing. Returns 0 for success, 1 otherwise. |
| 930 | */ |
| 931 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) |
| 932 | { |
| 933 | struct llc_sock *llc = llc_sk(sk); |
| 934 | |
| 935 | if (llc->ack_must_be_send) { |
| 936 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); |
| 937 | llc->ack_must_be_send = 0 ; |
| 938 | llc->ack_pf = 0; |
| 939 | } else |
| 940 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); |
| 941 | return 0; |
| 942 | } |
| 943 | |
| 944 | /** |
| 945 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked |
| 946 | * @sk: current connection structure. |
| 947 | * @skb: current event. |
| 948 | * |
| 949 | * This action sends an RR response with f-bit set to ack_pf flag as |
| 950 | * acknowledge to all received PDUs which have not been acknowledged, yet, |
| 951 | * if there is any. ack_pf flag indicates if a PDU has been received with |
| 952 | * p-bit set to one. Returns 0 for success, 1 otherwise. |
| 953 | */ |
| 954 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, |
| 955 | struct sk_buff *skb) |
| 956 | { |
| 957 | int rc = -ENOBUFS; |
| 958 | struct llc_sock *llc = llc_sk(sk); |
| 959 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
| 960 | |
| 961 | if (nskb) { |
| 962 | struct llc_sap *sap = llc->sap; |
| 963 | |
| 964 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
| 965 | llc->daddr.lsap, LLC_PDU_RSP); |
| 966 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); |
| 967 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
| 968 | if (unlikely(rc)) |
| 969 | goto free; |
| 970 | llc_conn_send_pdu(sk, nskb); |
| 971 | } |
| 972 | out: |
| 973 | return rc; |
| 974 | free: |
| 975 | kfree_skb(nskb); |
| 976 | goto out; |
| 977 | } |
| 978 | |
| 979 | /** |
| 980 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater |
| 981 | * @sk: current connection structure. |
| 982 | * @skb: current event. |
| 983 | * |
| 984 | * After "inc_cntr" times calling of this action, "npta" increase by one. |
| 985 | * this action tries to make vale of "npta" greater as possible; number of |
| 986 | * acknowledgements decreases by increasing of "npta". Returns 0 for |
| 987 | * success, 1 otherwise. |
| 988 | */ |
| 989 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) |
| 990 | { |
| 991 | struct llc_sock *llc = llc_sk(sk); |
| 992 | |
| 993 | if (!llc->inc_cntr) { |
| 994 | llc->dec_step = 0; |
| 995 | llc->dec_cntr = llc->inc_cntr = 2; |
| 996 | ++llc->npta; |
| 997 | if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO) |
| 998 | llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; |
| 999 | } else |
| 1000 | --llc->inc_cntr; |
| 1001 | return 0; |
| 1002 | } |
| 1003 | |
| 1004 | /** |
| 1005 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one |
| 1006 | * @sk: current connection structure. |
| 1007 | * @skb: current event. |
| 1008 | * |
| 1009 | * After receiving "dec_cntr" times RR command, this action decreases |
| 1010 | * "npta" by one. Returns 0 for success, 1 otherwise. |
| 1011 | */ |
| 1012 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) |
| 1013 | { |
| 1014 | struct llc_sock *llc = llc_sk(sk); |
| 1015 | |
| 1016 | if (!llc->connect_step && !llc->remote_busy_flag) { |
| 1017 | if (!llc->dec_step) { |
| 1018 | if (!llc->dec_cntr) { |
| 1019 | llc->inc_cntr = llc->dec_cntr = 2; |
| 1020 | if (llc->npta > 0) |
| 1021 | llc->npta = llc->npta - 1; |
| 1022 | } else |
| 1023 | llc->dec_cntr -=1; |
| 1024 | } |
| 1025 | } else |
| 1026 | llc->connect_step = 0 ; |
| 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | /** |
| 1031 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one |
| 1032 | * @sk: current connection structure. |
| 1033 | * @skb: current event. |
| 1034 | * |
| 1035 | * After receiving "dec_cntr" times RNR command, this action decreases |
| 1036 | * "npta" by one. Returns 0 for success, 1 otherwise. |
| 1037 | */ |
| 1038 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) |
| 1039 | { |
| 1040 | struct llc_sock *llc = llc_sk(sk); |
| 1041 | |
| 1042 | if (llc->remote_busy_flag) |
| 1043 | if (!llc->dec_step) { |
| 1044 | if (!llc->dec_cntr) { |
| 1045 | llc->inc_cntr = llc->dec_cntr = 2; |
| 1046 | if (llc->npta > 0) |
| 1047 | --llc->npta; |
| 1048 | } else |
| 1049 | --llc->dec_cntr; |
| 1050 | } |
| 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | /** |
| 1055 | * llc_conn_ac_dec_tx_win_size - decreases tx window size |
| 1056 | * @sk: current connection structure. |
| 1057 | * @skb: current event. |
| 1058 | * |
| 1059 | * After receiving of a REJ command or response, transmit window size is |
| 1060 | * decreased by number of PDUs which are outstanding yet. Returns 0 for |
| 1061 | * success, 1 otherwise. |
| 1062 | */ |
| 1063 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) |
| 1064 | { |
| 1065 | struct llc_sock *llc = llc_sk(sk); |
| 1066 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); |
| 1067 | |
| 1068 | if (llc->k - unacked_pdu < 1) |
| 1069 | llc->k = 1; |
| 1070 | else |
| 1071 | llc->k -= unacked_pdu; |
| 1072 | return 0; |
| 1073 | } |
| 1074 | |
| 1075 | /** |
| 1076 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 |
| 1077 | * @sk: current connection structure. |
| 1078 | * @skb: current event. |
| 1079 | * |
| 1080 | * After receiving an RR response with f-bit set to one, transmit window |
| 1081 | * size is increased by one. Returns 0 for success, 1 otherwise. |
| 1082 | */ |
| 1083 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) |
| 1084 | { |
| 1085 | struct llc_sock *llc = llc_sk(sk); |
| 1086 | |
| 1087 | llc->k += 1; |
| 1088 | if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO) |
| 1089 | llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
| 1093 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) |
| 1094 | { |
| 1095 | struct llc_sock *llc = llc_sk(sk); |
| 1096 | |
| 1097 | del_timer(&llc->pf_cycle_timer.timer); |
| 1098 | del_timer(&llc->ack_timer.timer); |
| 1099 | del_timer(&llc->rej_sent_timer.timer); |
| 1100 | del_timer(&llc->busy_state_timer.timer); |
| 1101 | llc->ack_must_be_send = 0; |
| 1102 | llc->ack_pf = 0; |
| 1103 | return 0; |
| 1104 | } |
| 1105 | |
| 1106 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) |
| 1107 | { |
| 1108 | struct llc_sock *llc = llc_sk(sk); |
| 1109 | |
| 1110 | del_timer(&llc->rej_sent_timer.timer); |
| 1111 | del_timer(&llc->pf_cycle_timer.timer); |
| 1112 | del_timer(&llc->busy_state_timer.timer); |
| 1113 | llc->ack_must_be_send = 0; |
| 1114 | llc->ack_pf = 0; |
| 1115 | return 0; |
| 1116 | } |
| 1117 | |
| 1118 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) |
| 1119 | { |
| 1120 | struct llc_sock *llc = llc_sk(sk); |
| 1121 | |
| 1122 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); |
| 1123 | return 0; |
| 1124 | } |
| 1125 | |
| 1126 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) |
| 1127 | { |
| 1128 | struct llc_sock *llc = llc_sk(sk); |
| 1129 | |
| 1130 | mod_timer(&llc->rej_sent_timer.timer, |
| 1131 | jiffies + llc->rej_sent_timer.expire); |
| 1132 | return 0; |
| 1133 | } |
| 1134 | |
| 1135 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, |
| 1136 | struct sk_buff *skb) |
| 1137 | { |
| 1138 | struct llc_sock *llc = llc_sk(sk); |
| 1139 | |
| 1140 | if (!timer_pending(&llc->ack_timer.timer)) |
| 1141 | mod_timer(&llc->ack_timer.timer, |
| 1142 | jiffies + llc->ack_timer.expire); |
| 1143 | return 0; |
| 1144 | } |
| 1145 | |
| 1146 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) |
| 1147 | { |
| 1148 | del_timer(&llc_sk(sk)->ack_timer.timer); |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
| 1152 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) |
| 1153 | { |
| 1154 | struct llc_sock *llc = llc_sk(sk); |
| 1155 | |
| 1156 | del_timer(&llc->pf_cycle_timer.timer); |
| 1157 | llc_conn_set_p_flag(sk, 0); |
| 1158 | return 0; |
| 1159 | } |
| 1160 | |
| 1161 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) |
| 1162 | { |
| 1163 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) |
| 1168 | { |
| 1169 | int acked; |
| 1170 | u16 unacked = 0; |
| 1171 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 1172 | struct llc_sock *llc = llc_sk(sk); |
| 1173 | |
| 1174 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); |
| 1175 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); |
| 1176 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ |
| 1177 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { |
| 1178 | llc->retry_count = 0; |
| 1179 | del_timer(&llc->ack_timer.timer); |
| 1180 | if (llc->failed_data_req) { |
| 1181 | /* already, we did not accept data from upper layer |
| 1182 | * (tx_window full or unacceptable state). Now, we |
| 1183 | * can send data and must inform to upper layer. |
| 1184 | */ |
| 1185 | llc->failed_data_req = 0; |
| 1186 | llc_conn_ac_data_confirm(sk, skb); |
| 1187 | } |
| 1188 | if (unacked) |
| 1189 | mod_timer(&llc->ack_timer.timer, |
| 1190 | jiffies + llc->ack_timer.expire); |
| 1191 | } else if (llc->failed_data_req) { |
| 1192 | u8 f_bit; |
| 1193 | |
| 1194 | llc_pdu_decode_pf_bit(skb, &f_bit); |
| 1195 | if (f_bit == 1) { |
| 1196 | llc->failed_data_req = 0; |
| 1197 | llc_conn_ac_data_confirm(sk, skb); |
| 1198 | } |
| 1199 | } |
| 1200 | return 0; |
| 1201 | } |
| 1202 | |
| 1203 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) |
| 1204 | { |
| 1205 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 1206 | |
| 1207 | if (LLC_PDU_IS_RSP(pdu)) { |
| 1208 | u8 f_bit; |
| 1209 | |
| 1210 | llc_pdu_decode_pf_bit(skb, &f_bit); |
| 1211 | if (f_bit) { |
| 1212 | llc_conn_set_p_flag(sk, 0); |
| 1213 | llc_conn_ac_stop_p_timer(sk, skb); |
| 1214 | } |
| 1215 | } |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
| 1219 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) |
| 1220 | { |
| 1221 | llc_sk(sk)->data_flag = 2; |
| 1222 | return 0; |
| 1223 | } |
| 1224 | |
| 1225 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) |
| 1226 | { |
| 1227 | llc_sk(sk)->data_flag = 0; |
| 1228 | return 0; |
| 1229 | } |
| 1230 | |
| 1231 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) |
| 1232 | { |
| 1233 | llc_sk(sk)->data_flag = 1; |
| 1234 | return 0; |
| 1235 | } |
| 1236 | |
| 1237 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, |
| 1238 | struct sk_buff *skb) |
| 1239 | { |
| 1240 | if (!llc_sk(sk)->data_flag) |
| 1241 | llc_sk(sk)->data_flag = 1; |
| 1242 | return 0; |
| 1243 | } |
| 1244 | |
| 1245 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) |
| 1246 | { |
| 1247 | llc_conn_set_p_flag(sk, 0); |
| 1248 | return 0; |
| 1249 | } |
| 1250 | |
| 1251 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) |
| 1252 | { |
| 1253 | llc_conn_set_p_flag(sk, 1); |
| 1254 | return 0; |
| 1255 | } |
| 1256 | |
| 1257 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) |
| 1258 | { |
| 1259 | llc_sk(sk)->remote_busy_flag = 0; |
| 1260 | return 0; |
| 1261 | } |
| 1262 | |
| 1263 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) |
| 1264 | { |
| 1265 | llc_sk(sk)->cause_flag = 0; |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) |
| 1270 | { |
| 1271 | llc_sk(sk)->cause_flag = 1; |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) |
| 1276 | { |
| 1277 | llc_sk(sk)->retry_count = 0; |
| 1278 | return 0; |
| 1279 | } |
| 1280 | |
| 1281 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) |
| 1282 | { |
| 1283 | llc_sk(sk)->retry_count++; |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
| 1287 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) |
| 1288 | { |
| 1289 | llc_sk(sk)->vR = 0; |
| 1290 | return 0; |
| 1291 | } |
| 1292 | |
| 1293 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) |
| 1294 | { |
| 1295 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); |
| 1296 | return 0; |
| 1297 | } |
| 1298 | |
| 1299 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) |
| 1300 | { |
| 1301 | llc_sk(sk)->vS = 0; |
| 1302 | return 0; |
| 1303 | } |
| 1304 | |
| 1305 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) |
| 1306 | { |
| 1307 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; |
| 1308 | return 0; |
| 1309 | } |
| 1310 | |
| 1311 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
| 1312 | { |
| 1313 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO; |
| 1314 | return 0; |
| 1315 | } |
| 1316 | |
| 1317 | static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) |
| 1318 | { |
| 1319 | struct sock *sk = (struct sock *)timeout_data; |
| 1320 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); |
| 1321 | |
| 1322 | bh_lock_sock(sk); |
| 1323 | if (skb) { |
| 1324 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
| 1325 | |
| 1326 | skb_set_owner_r(skb, sk); |
| 1327 | ev->type = type; |
| 1328 | llc_process_tmr_ev(sk, skb); |
| 1329 | } |
| 1330 | bh_unlock_sock(sk); |
| 1331 | } |
| 1332 | |
| 1333 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) |
| 1334 | { |
| 1335 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); |
| 1336 | } |
| 1337 | |
| 1338 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) |
| 1339 | { |
| 1340 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); |
| 1341 | } |
| 1342 | |
| 1343 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) |
| 1344 | { |
| 1345 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); |
| 1346 | } |
| 1347 | |
| 1348 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) |
| 1349 | { |
| 1350 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); |
| 1351 | } |
| 1352 | |
| 1353 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) |
| 1354 | { |
| 1355 | llc_sk(sk)->X = llc_sk(sk)->vS; |
| 1356 | llc_conn_ac_set_vs_nr(sk, skb); |
| 1357 | return 0; |
| 1358 | } |
| 1359 | |
| 1360 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) |
| 1361 | { |
| 1362 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
| 1363 | u8 nr = PDU_SUPV_GET_Nr(pdu); |
| 1364 | |
| 1365 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) |
| 1366 | llc_conn_ac_set_vs_nr(sk, skb); |
| 1367 | return 0; |
| 1368 | } |
| 1369 | |
| 1370 | /* |
| 1371 | * Non-standard actions; these not contained in IEEE specification; for |
| 1372 | * our own usage |
| 1373 | */ |
| 1374 | /** |
| 1375 | * llc_conn_disc - removes connection from SAP list and frees it |
| 1376 | * @sk: closed connection |
| 1377 | * @skb: occurred event |
| 1378 | */ |
| 1379 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) |
| 1380 | { |
| 1381 | /* FIXME: this thing seems to want to die */ |
| 1382 | return 0; |
| 1383 | } |
| 1384 | |
| 1385 | /** |
| 1386 | * llc_conn_reset - resets connection |
| 1387 | * @sk : reseting connection. |
| 1388 | * @skb: occurred event. |
| 1389 | * |
| 1390 | * Stop all timers, empty all queues and reset all flags. |
| 1391 | */ |
| 1392 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) |
| 1393 | { |
| 1394 | llc_sk_reset(sk); |
| 1395 | return 0; |
| 1396 | } |
| 1397 | |
| 1398 | /** |
| 1399 | * llc_circular_between - designates that b is between a and c or not |
| 1400 | * @a: lower bound |
| 1401 | * @b: element to see if is between a and b |
| 1402 | * @c: upper bound |
| 1403 | * |
| 1404 | * This function designates that b is between a and c or not (for example, |
| 1405 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 |
| 1406 | * otherwise. |
| 1407 | */ |
| 1408 | u8 llc_circular_between(u8 a, u8 b, u8 c) |
| 1409 | { |
| 1410 | b = b - a; |
| 1411 | c = c - a; |
| 1412 | return b <= c; |
| 1413 | } |
| 1414 | |
| 1415 | /** |
| 1416 | * llc_process_tmr_ev - timer backend |
| 1417 | * @sk: active connection |
| 1418 | * @skb: occurred event |
| 1419 | * |
| 1420 | * This function is called from timer callback functions. When connection |
| 1421 | * is busy (during sending a data frame) timer expiration event must be |
| 1422 | * queued. Otherwise this event can be sent to connection state machine. |
| 1423 | * Queued events will process by llc_backlog_rcv function after sending |
| 1424 | * data frame. |
| 1425 | */ |
| 1426 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) |
| 1427 | { |
| 1428 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { |
| 1429 | printk(KERN_WARNING "%s: timer called on closed connection\n", |
| 1430 | __func__); |
| 1431 | kfree_skb(skb); |
| 1432 | } else { |
| 1433 | if (!sock_owned_by_user(sk)) |
| 1434 | llc_conn_state_process(sk, skb); |
| 1435 | else { |
| 1436 | llc_set_backlog_type(skb, LLC_EVENT); |
| 1437 | sk_add_backlog(sk, skb); |
| 1438 | } |
| 1439 | } |
| 1440 | } |