Commit | Line | Data |
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1da177e4 LT |
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 | #include "llc_output.h" | |
31 | ||
32 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); | |
33 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); | |
34 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); | |
35 | ||
36 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); | |
37 | ||
38 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
39 | struct sk_buff *skb); | |
40 | ||
41 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); | |
42 | ||
43 | #define INCORRECT 0 | |
44 | ||
45 | int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) | |
46 | { | |
47 | struct llc_sock *llc = llc_sk(sk); | |
48 | ||
49 | if (llc->remote_busy_flag) { | |
50 | u8 nr; | |
51 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
52 | ||
53 | llc->remote_busy_flag = 0; | |
54 | del_timer(&llc->busy_state_timer.timer); | |
55 | nr = LLC_I_GET_NR(pdu); | |
56 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
57 | } | |
58 | return 0; | |
59 | } | |
60 | ||
61 | int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) | |
62 | { | |
d389424e ACM |
63 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
64 | ||
65 | ev->ind_prim = LLC_CONN_PRIM; | |
66 | return 0; | |
1da177e4 LT |
67 | } |
68 | ||
69 | int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) | |
70 | { | |
71 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
72 | ||
73 | ev->cfm_prim = LLC_CONN_PRIM; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) | |
78 | { | |
79 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
80 | ||
81 | ev->cfm_prim = LLC_DATA_PRIM; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) | |
86 | { | |
87 | llc_conn_rtn_pdu(sk, skb); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) | |
92 | { | |
93 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
94 | u8 reason = 0; | |
95 | int rc = 0; | |
96 | ||
97 | if (ev->type == LLC_CONN_EV_TYPE_PDU) { | |
98 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
99 | ||
100 | if (LLC_PDU_IS_RSP(pdu) && | |
101 | LLC_PDU_TYPE_IS_U(pdu) && | |
102 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) | |
103 | reason = LLC_DISC_REASON_RX_DM_RSP_PDU; | |
104 | else if (LLC_PDU_IS_CMD(pdu) && | |
105 | LLC_PDU_TYPE_IS_U(pdu) && | |
106 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) | |
107 | reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; | |
108 | } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) | |
109 | reason = LLC_DISC_REASON_ACK_TMR_EXP; | |
bdcc66cc | 110 | else |
1da177e4 | 111 | rc = -EINVAL; |
1da177e4 LT |
112 | if (!rc) { |
113 | ev->reason = reason; | |
114 | ev->ind_prim = LLC_DISC_PRIM; | |
115 | } | |
116 | return rc; | |
117 | } | |
118 | ||
119 | int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) | |
120 | { | |
121 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
122 | ||
123 | ev->reason = ev->status; | |
124 | ev->cfm_prim = LLC_DISC_PRIM; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) | |
129 | { | |
130 | u8 reason = 0; | |
131 | int rc = 1; | |
132 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
133 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
134 | struct llc_sock *llc = llc_sk(sk); | |
135 | ||
136 | switch (ev->type) { | |
137 | case LLC_CONN_EV_TYPE_PDU: | |
138 | if (LLC_PDU_IS_RSP(pdu) && | |
139 | LLC_PDU_TYPE_IS_U(pdu) && | |
140 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { | |
141 | reason = LLC_RESET_REASON_LOCAL; | |
142 | rc = 0; | |
143 | } else if (LLC_PDU_IS_CMD(pdu) && | |
144 | LLC_PDU_TYPE_IS_U(pdu) && | |
145 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { | |
146 | reason = LLC_RESET_REASON_REMOTE; | |
147 | rc = 0; | |
1da177e4 LT |
148 | } |
149 | break; | |
150 | case LLC_CONN_EV_TYPE_ACK_TMR: | |
151 | case LLC_CONN_EV_TYPE_P_TMR: | |
152 | case LLC_CONN_EV_TYPE_REJ_TMR: | |
153 | case LLC_CONN_EV_TYPE_BUSY_TMR: | |
154 | if (llc->retry_count > llc->n2) { | |
155 | reason = LLC_RESET_REASON_LOCAL; | |
156 | rc = 0; | |
bdcc66cc | 157 | } |
1da177e4 LT |
158 | break; |
159 | } | |
160 | if (!rc) { | |
161 | ev->reason = reason; | |
162 | ev->ind_prim = LLC_RESET_PRIM; | |
163 | } | |
164 | return rc; | |
165 | } | |
166 | ||
167 | int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) | |
168 | { | |
169 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
170 | ||
171 | ev->reason = 0; | |
172 | ev->cfm_prim = LLC_RESET_PRIM; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, | |
177 | struct sk_buff *skb) | |
178 | { | |
179 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
180 | ||
181 | if (LLC_PDU_IS_RSP(pdu) && | |
182 | LLC_PDU_TYPE_IS_I(pdu) && | |
183 | LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf) | |
184 | llc_conn_ac_clear_remote_busy(sk, skb); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, | |
189 | struct sk_buff *skb) | |
190 | { | |
191 | struct llc_sock *llc = llc_sk(sk); | |
192 | ||
193 | if (llc->data_flag == 2) | |
194 | del_timer(&llc->rej_sent_timer.timer); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
199 | { | |
200 | int rc = -ENOBUFS; | |
1d67e650 | 201 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 202 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
203 | |
204 | if (nskb) { | |
1da177e4 LT |
205 | struct llc_sap *sap = llc->sap; |
206 | ||
1da177e4 LT |
207 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
208 | llc->daddr.lsap, LLC_PDU_CMD); | |
209 | llc_pdu_init_as_disc_cmd(nskb, 1); | |
210 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 211 | if (unlikely(rc)) |
1da177e4 LT |
212 | goto free; |
213 | llc_conn_send_pdu(sk, nskb); | |
214 | llc_conn_ac_set_p_flag_1(sk, skb); | |
215 | } | |
216 | out: | |
217 | return rc; | |
218 | free: | |
219 | kfree_skb(nskb); | |
220 | goto out; | |
221 | } | |
222 | ||
223 | int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
224 | { | |
225 | int rc = -ENOBUFS; | |
1d67e650 | 226 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 227 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
228 | |
229 | if (nskb) { | |
1da177e4 LT |
230 | struct llc_sap *sap = llc->sap; |
231 | u8 f_bit; | |
232 | ||
1da177e4 LT |
233 | llc_pdu_decode_pf_bit(skb, &f_bit); |
234 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
235 | llc->daddr.lsap, LLC_PDU_RSP); | |
236 | llc_pdu_init_as_dm_rsp(nskb, f_bit); | |
237 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 238 | if (unlikely(rc)) |
1da177e4 LT |
239 | goto free; |
240 | llc_conn_send_pdu(sk, nskb); | |
241 | } | |
242 | out: | |
243 | return rc; | |
244 | free: | |
245 | kfree_skb(nskb); | |
246 | goto out; | |
247 | } | |
248 | ||
249 | int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
250 | { | |
251 | int rc = -ENOBUFS; | |
1d67e650 | 252 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 253 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
254 | |
255 | if (nskb) { | |
1da177e4 | 256 | struct llc_sap *sap = llc->sap; |
1da177e4 | 257 | |
1da177e4 LT |
258 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
259 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 260 | llc_pdu_init_as_dm_rsp(nskb, 1); |
1da177e4 | 261 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 262 | if (unlikely(rc)) |
1da177e4 LT |
263 | goto free; |
264 | llc_conn_send_pdu(sk, nskb); | |
265 | } | |
266 | out: | |
267 | return rc; | |
268 | free: | |
269 | kfree_skb(nskb); | |
270 | goto out; | |
271 | } | |
272 | ||
273 | int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) | |
274 | { | |
275 | u8 f_bit; | |
276 | int rc = -ENOBUFS; | |
277 | struct sk_buff *nskb; | |
278 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
279 | struct llc_sock *llc = llc_sk(sk); | |
280 | ||
281 | llc->rx_pdu_hdr = *((u32 *)pdu); | |
282 | if (LLC_PDU_IS_CMD(pdu)) | |
283 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
284 | else | |
285 | f_bit = 0; | |
d389424e | 286 | nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
287 | if (nskb) { |
288 | struct llc_sap *sap = llc->sap; | |
289 | ||
1da177e4 LT |
290 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
291 | llc->daddr.lsap, LLC_PDU_RSP); | |
292 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
293 | llc->vR, INCORRECT); | |
294 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 295 | if (unlikely(rc)) |
1da177e4 LT |
296 | goto free; |
297 | llc_conn_send_pdu(sk, nskb); | |
298 | } | |
299 | out: | |
300 | return rc; | |
301 | free: | |
302 | kfree_skb(nskb); | |
303 | goto out; | |
304 | } | |
305 | ||
306 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) | |
307 | { | |
308 | int rc = -ENOBUFS; | |
1d67e650 | 309 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 310 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
311 | |
312 | if (nskb) { | |
1da177e4 LT |
313 | struct llc_sap *sap = llc->sap; |
314 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
315 | ||
1da177e4 LT |
316 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
317 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 318 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
1da177e4 LT |
319 | llc->vR, INCORRECT); |
320 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 321 | if (unlikely(rc)) |
1da177e4 LT |
322 | goto free; |
323 | llc_conn_send_pdu(sk, nskb); | |
324 | } | |
325 | out: | |
326 | return rc; | |
327 | free: | |
328 | kfree_skb(nskb); | |
329 | goto out; | |
330 | } | |
331 | ||
332 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
333 | { | |
334 | u8 f_bit; | |
335 | int rc = -ENOBUFS; | |
336 | struct sk_buff *nskb; | |
1d67e650 | 337 | struct llc_sock *llc = llc_sk(sk); |
1da177e4 LT |
338 | |
339 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
d389424e | 340 | nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 | 341 | if (nskb) { |
1da177e4 LT |
342 | struct llc_sap *sap = llc->sap; |
343 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
344 | ||
1da177e4 LT |
345 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
346 | llc->daddr.lsap, LLC_PDU_RSP); | |
347 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
348 | llc->vR, INCORRECT); | |
349 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 350 | if (unlikely(rc)) |
1da177e4 LT |
351 | goto free; |
352 | llc_conn_send_pdu(sk, nskb); | |
353 | } | |
354 | out: | |
355 | return rc; | |
356 | free: | |
357 | kfree_skb(nskb); | |
358 | goto out; | |
359 | } | |
360 | ||
361 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
362 | { | |
363 | int rc; | |
364 | struct llc_sock *llc = llc_sk(sk); | |
365 | struct llc_sap *sap = llc->sap; | |
366 | ||
367 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
368 | llc->daddr.lsap, LLC_PDU_CMD); | |
369 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
370 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 371 | if (likely(!rc)) { |
1da177e4 LT |
372 | llc_conn_send_pdu(sk, skb); |
373 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
374 | } | |
375 | return rc; | |
376 | } | |
377 | ||
378 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
379 | { | |
380 | int rc; | |
381 | struct llc_sock *llc = llc_sk(sk); | |
382 | struct llc_sap *sap = llc->sap; | |
383 | ||
384 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
385 | llc->daddr.lsap, LLC_PDU_CMD); | |
386 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
387 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 388 | if (likely(!rc)) { |
1da177e4 LT |
389 | llc_conn_send_pdu(sk, skb); |
390 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
391 | } | |
392 | return rc; | |
393 | } | |
394 | ||
395 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
396 | { | |
397 | int rc; | |
398 | struct llc_sock *llc = llc_sk(sk); | |
399 | struct llc_sap *sap = llc->sap; | |
400 | ||
401 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
402 | llc->daddr.lsap, LLC_PDU_CMD); | |
403 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
404 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 405 | if (likely(!rc)) { |
1da177e4 LT |
406 | llc_conn_send_pdu(sk, skb); |
407 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
412 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
413 | { | |
414 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
415 | u8 nr = LLC_I_GET_NR(pdu); | |
416 | ||
417 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
418 | return 0; | |
419 | } | |
420 | ||
421 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
422 | struct sk_buff *skb) | |
423 | { | |
424 | u8 nr; | |
425 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
426 | int rc = -ENOBUFS; | |
1d67e650 | 427 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 428 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
429 | |
430 | if (nskb) { | |
1da177e4 LT |
431 | struct llc_sap *sap = llc->sap; |
432 | ||
1da177e4 LT |
433 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
434 | llc->daddr.lsap, LLC_PDU_RSP); | |
435 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
436 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 437 | if (likely(!rc)) |
1da177e4 LT |
438 | llc_conn_send_pdu(sk, nskb); |
439 | else | |
440 | kfree_skb(skb); | |
441 | } | |
442 | if (rc) { | |
443 | nr = LLC_I_GET_NR(pdu); | |
444 | rc = 0; | |
445 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
446 | } | |
447 | return rc; | |
448 | } | |
449 | ||
450 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
451 | { | |
452 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
453 | u8 nr = LLC_I_GET_NR(pdu); | |
454 | ||
455 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
460 | { | |
461 | int rc = -ENOBUFS; | |
1d67e650 | 462 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 463 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
464 | |
465 | if (nskb) { | |
1da177e4 LT |
466 | struct llc_sap *sap = llc->sap; |
467 | ||
1da177e4 LT |
468 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
469 | llc->daddr.lsap, LLC_PDU_CMD); | |
470 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
471 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 472 | if (unlikely(rc)) |
1da177e4 LT |
473 | goto free; |
474 | llc_conn_send_pdu(sk, nskb); | |
475 | } | |
476 | out: | |
477 | return rc; | |
478 | free: | |
479 | kfree_skb(nskb); | |
480 | goto out; | |
481 | } | |
482 | ||
483 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
484 | { | |
485 | int rc = -ENOBUFS; | |
1d67e650 | 486 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 487 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
488 | |
489 | if (nskb) { | |
1da177e4 LT |
490 | struct llc_sap *sap = llc->sap; |
491 | ||
1da177e4 LT |
492 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
493 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 494 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
1da177e4 | 495 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 496 | if (unlikely(rc)) |
1da177e4 LT |
497 | goto free; |
498 | llc_conn_send_pdu(sk, nskb); | |
499 | } | |
500 | out: | |
501 | return rc; | |
502 | free: | |
503 | kfree_skb(nskb); | |
504 | goto out; | |
505 | } | |
506 | ||
507 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
508 | { | |
509 | int rc = -ENOBUFS; | |
1d67e650 | 510 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 511 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
512 | |
513 | if (nskb) { | |
1da177e4 | 514 | struct llc_sap *sap = llc->sap; |
1da177e4 | 515 | |
1da177e4 LT |
516 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
517 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 518 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
1da177e4 | 519 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 520 | if (unlikely(rc)) |
1da177e4 LT |
521 | goto free; |
522 | llc_conn_send_pdu(sk, nskb); | |
523 | } | |
524 | out: | |
525 | return rc; | |
526 | free: | |
527 | kfree_skb(nskb); | |
528 | goto out; | |
529 | } | |
530 | ||
531 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
532 | { | |
533 | int rc = -ENOBUFS; | |
1d67e650 | 534 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 535 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
536 | |
537 | if (nskb) { | |
1da177e4 LT |
538 | struct llc_sap *sap = llc->sap; |
539 | ||
1da177e4 LT |
540 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
541 | llc->daddr.lsap, LLC_PDU_CMD); | |
542 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
543 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 544 | if (unlikely(rc)) |
1da177e4 LT |
545 | goto free; |
546 | llc_conn_send_pdu(sk, nskb); | |
547 | } | |
548 | out: | |
549 | return rc; | |
550 | free: | |
551 | kfree_skb(nskb); | |
552 | goto out; | |
553 | } | |
554 | ||
555 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
556 | { | |
557 | int rc = -ENOBUFS; | |
1d67e650 | 558 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 559 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
560 | |
561 | if (nskb) { | |
1da177e4 | 562 | struct llc_sap *sap = llc->sap; |
1da177e4 | 563 | |
1da177e4 LT |
564 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
565 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 566 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
1da177e4 | 567 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 568 | if (unlikely(rc)) |
1da177e4 LT |
569 | goto free; |
570 | llc_conn_send_pdu(sk, nskb); | |
571 | } | |
572 | out: | |
573 | return rc; | |
574 | free: | |
575 | kfree_skb(nskb); | |
576 | goto out; | |
577 | } | |
578 | ||
579 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
580 | { | |
581 | int rc = -ENOBUFS; | |
1d67e650 | 582 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 583 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
584 | |
585 | if (nskb) { | |
1da177e4 LT |
586 | struct llc_sap *sap = llc->sap; |
587 | ||
1da177e4 LT |
588 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
589 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 590 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
1da177e4 | 591 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 592 | if (unlikely(rc)) |
1da177e4 LT |
593 | goto free; |
594 | llc_conn_send_pdu(sk, nskb); | |
595 | } | |
596 | out: | |
597 | return rc; | |
598 | free: | |
599 | kfree_skb(nskb); | |
600 | goto out; | |
601 | } | |
602 | ||
603 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
604 | { | |
605 | struct llc_sock *llc = llc_sk(sk); | |
606 | ||
607 | if (!llc->remote_busy_flag) { | |
608 | llc->remote_busy_flag = 1; | |
609 | mod_timer(&llc->busy_state_timer.timer, | |
590232a7 | 610 | jiffies + llc->busy_state_timer.expire); |
1da177e4 LT |
611 | } |
612 | return 0; | |
613 | } | |
614 | ||
615 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
616 | { | |
617 | int rc = -ENOBUFS; | |
1d67e650 | 618 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 619 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
620 | |
621 | if (nskb) { | |
1da177e4 LT |
622 | struct llc_sap *sap = llc->sap; |
623 | ||
1da177e4 LT |
624 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
625 | llc->daddr.lsap, LLC_PDU_RSP); | |
626 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
627 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 628 | if (unlikely(rc)) |
1da177e4 LT |
629 | goto free; |
630 | llc_conn_send_pdu(sk, nskb); | |
631 | } | |
632 | out: | |
633 | return rc; | |
634 | free: | |
635 | kfree_skb(nskb); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
640 | { | |
641 | int rc = -ENOBUFS; | |
1d67e650 | 642 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 643 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
644 | |
645 | if (nskb) { | |
1da177e4 LT |
646 | struct llc_sap *sap = llc->sap; |
647 | ||
1da177e4 LT |
648 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
649 | llc->daddr.lsap, LLC_PDU_CMD); | |
650 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
651 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 652 | if (unlikely(rc)) |
1da177e4 LT |
653 | goto free; |
654 | llc_conn_send_pdu(sk, nskb); | |
655 | } | |
656 | out: | |
657 | return rc; | |
658 | free: | |
659 | kfree_skb(nskb); | |
660 | goto out; | |
661 | } | |
662 | ||
663 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
664 | { | |
665 | int rc = -ENOBUFS; | |
1d67e650 | 666 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 667 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
668 | |
669 | if (nskb) { | |
1da177e4 LT |
670 | struct llc_sap *sap = llc->sap; |
671 | u8 f_bit = 1; | |
672 | ||
1da177e4 LT |
673 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
674 | llc->daddr.lsap, LLC_PDU_RSP); | |
675 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
676 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 677 | if (unlikely(rc)) |
1da177e4 LT |
678 | goto free; |
679 | llc_conn_send_pdu(sk, nskb); | |
680 | } | |
681 | out: | |
682 | return rc; | |
683 | free: | |
684 | kfree_skb(nskb); | |
685 | goto out; | |
686 | } | |
687 | ||
688 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
689 | { | |
690 | int rc = -ENOBUFS; | |
1d67e650 | 691 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 692 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
693 | |
694 | if (nskb) { | |
1da177e4 | 695 | struct llc_sap *sap = llc->sap; |
1da177e4 | 696 | |
1da177e4 LT |
697 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
698 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 699 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
1da177e4 | 700 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 701 | if (unlikely(rc)) |
1da177e4 LT |
702 | goto free; |
703 | llc_conn_send_pdu(sk, nskb); | |
704 | } | |
705 | out: | |
706 | return rc; | |
707 | free: | |
708 | kfree_skb(nskb); | |
709 | goto out; | |
710 | } | |
711 | ||
712 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
713 | { | |
714 | int rc = -ENOBUFS; | |
1d67e650 | 715 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 716 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
717 | |
718 | if (nskb) { | |
1da177e4 LT |
719 | struct llc_sap *sap = llc->sap; |
720 | ||
1da177e4 LT |
721 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
722 | llc->daddr.lsap, LLC_PDU_RSP); | |
723 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
724 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 725 | if (unlikely(rc)) |
1da177e4 LT |
726 | goto free; |
727 | llc_conn_send_pdu(sk, nskb); | |
728 | } | |
729 | out: | |
730 | return rc; | |
731 | free: | |
732 | kfree_skb(nskb); | |
733 | goto out; | |
734 | } | |
735 | ||
736 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
737 | { | |
738 | int rc = -ENOBUFS; | |
1d67e650 | 739 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 740 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
741 | |
742 | if (nskb) { | |
1da177e4 LT |
743 | struct llc_sap *sap = llc->sap; |
744 | ||
1da177e4 LT |
745 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
746 | llc->daddr.lsap, LLC_PDU_RSP); | |
747 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
748 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 749 | if (unlikely(rc)) |
1da177e4 LT |
750 | goto free; |
751 | llc_conn_send_pdu(sk, nskb); | |
752 | } | |
753 | out: | |
754 | return rc; | |
755 | free: | |
756 | kfree_skb(nskb); | |
757 | goto out; | |
758 | } | |
759 | ||
760 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
761 | { | |
762 | int state_changed = llc_sk(sk)->p_flag && !value; | |
763 | ||
764 | llc_sk(sk)->p_flag = value; | |
765 | ||
766 | if (state_changed) | |
767 | sk->sk_state_change(sk); | |
768 | } | |
769 | ||
770 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
771 | { | |
772 | int rc = -ENOBUFS; | |
1da177e4 | 773 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 774 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
775 | |
776 | if (nskb) { | |
777 | struct llc_sap *sap = llc->sap; | |
778 | u8 *dmac = llc->daddr.mac; | |
779 | ||
780 | if (llc->dev->flags & IFF_LOOPBACK) | |
781 | dmac = llc->dev->dev_addr; | |
1da177e4 LT |
782 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
783 | llc->daddr.lsap, LLC_PDU_CMD); | |
784 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
785 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
249ff1c6 | 786 | if (unlikely(rc)) |
1da177e4 LT |
787 | goto free; |
788 | llc_conn_send_pdu(sk, nskb); | |
789 | llc_conn_set_p_flag(sk, 1); | |
790 | } | |
791 | out: | |
792 | return rc; | |
793 | free: | |
794 | kfree_skb(nskb); | |
795 | goto out; | |
796 | } | |
797 | ||
798 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
799 | { | |
800 | u8 f_bit; | |
801 | int rc = -ENOBUFS; | |
1d67e650 | 802 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 803 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
804 | |
805 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
806 | if (nskb) { | |
1da177e4 LT |
807 | struct llc_sap *sap = llc->sap; |
808 | ||
809 | nskb->dev = llc->dev; | |
810 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
811 | llc->daddr.lsap, LLC_PDU_RSP); | |
812 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
813 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 814 | if (unlikely(rc)) |
1da177e4 LT |
815 | goto free; |
816 | llc_conn_send_pdu(sk, nskb); | |
817 | } | |
818 | out: | |
819 | return rc; | |
820 | free: | |
821 | kfree_skb(nskb); | |
822 | goto out; | |
823 | } | |
824 | ||
825 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
826 | { | |
827 | llc_sk(sk)->s_flag = 0; | |
828 | return 0; | |
829 | } | |
830 | ||
831 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
832 | { | |
833 | llc_sk(sk)->s_flag = 1; | |
834 | return 0; | |
835 | } | |
836 | ||
837 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
838 | { | |
839 | struct llc_sock *llc = llc_sk(sk); | |
840 | ||
841 | llc_conn_set_p_flag(sk, 1); | |
842 | mod_timer(&llc->pf_cycle_timer.timer, | |
590232a7 | 843 | jiffies + llc->pf_cycle_timer.expire); |
1da177e4 LT |
844 | return 0; |
845 | } | |
846 | ||
847 | /** | |
848 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
849 | * @sk: current connection structure | |
850 | * @skb: current event | |
851 | * | |
852 | * Checks number of received PDUs which have not been acknowledged, yet, | |
853 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
854 | * sends an RR response as acknowledgement for them. Returns 0 for | |
855 | * success, 1 otherwise. | |
856 | */ | |
857 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
858 | { | |
859 | u8 pf_bit; | |
860 | struct llc_sock *llc = llc_sk(sk); | |
861 | ||
862 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
863 | llc->ack_pf |= pf_bit & 1; | |
864 | if (!llc->ack_must_be_send) { | |
865 | llc->first_pdu_Ns = llc->vR; | |
866 | llc->ack_must_be_send = 1; | |
867 | llc->ack_pf = pf_bit & 1; | |
868 | } | |
869 | if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= 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); | |
249ff1c6 | 914 | if (likely(!rc)) { |
1da177e4 LT |
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; | |
1d67e650 | 958 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 959 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
960 | |
961 | if (nskb) { | |
1da177e4 LT |
962 | struct llc_sap *sap = llc->sap; |
963 | ||
1da177e4 LT |
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); | |
249ff1c6 | 968 | if (unlikely(rc)) |
1da177e4 LT |
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 > 127) | |
998 | llc->npta = 127 ; | |
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 | llc->k -= unacked_pdu; | |
1069 | if (llc->k < 2) | |
1070 | llc->k = 2; | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1076 | * @sk: current connection structure. | |
1077 | * @skb: current event. | |
1078 | * | |
1079 | * After receiving an RR response with f-bit set to one, transmit window | |
1080 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1081 | */ | |
1082 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1083 | { | |
1084 | struct llc_sock *llc = llc_sk(sk); | |
1085 | ||
1086 | llc->k += 1; | |
1087 | if (llc->k > 128) | |
1088 | llc->k = 128 ; | |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1093 | { | |
1094 | struct llc_sock *llc = llc_sk(sk); | |
1095 | ||
1096 | del_timer(&llc->pf_cycle_timer.timer); | |
1097 | del_timer(&llc->ack_timer.timer); | |
1098 | del_timer(&llc->rej_sent_timer.timer); | |
1099 | del_timer(&llc->busy_state_timer.timer); | |
1100 | llc->ack_must_be_send = 0; | |
1101 | llc->ack_pf = 0; | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1106 | { | |
1107 | struct llc_sock *llc = llc_sk(sk); | |
1108 | ||
1109 | del_timer(&llc->rej_sent_timer.timer); | |
1110 | del_timer(&llc->pf_cycle_timer.timer); | |
1111 | del_timer(&llc->busy_state_timer.timer); | |
1112 | llc->ack_must_be_send = 0; | |
1113 | llc->ack_pf = 0; | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1118 | { | |
1119 | struct llc_sock *llc = llc_sk(sk); | |
1120 | ||
590232a7 | 1121 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1122 | return 0; |
1123 | } | |
1124 | ||
1125 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1126 | { | |
1127 | struct llc_sock *llc = llc_sk(sk); | |
1128 | ||
1129 | mod_timer(&llc->rej_sent_timer.timer, | |
590232a7 | 1130 | jiffies + llc->rej_sent_timer.expire); |
1da177e4 LT |
1131 | return 0; |
1132 | } | |
1133 | ||
1134 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, | |
1135 | struct sk_buff *skb) | |
1136 | { | |
1137 | struct llc_sock *llc = llc_sk(sk); | |
1138 | ||
1139 | if (!timer_pending(&llc->ack_timer.timer)) | |
1140 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1141 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1142 | return 0; |
1143 | } | |
1144 | ||
1145 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1146 | { | |
1147 | del_timer(&llc_sk(sk)->ack_timer.timer); | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) | |
1152 | { | |
1153 | struct llc_sock *llc = llc_sk(sk); | |
1154 | ||
1155 | del_timer(&llc->pf_cycle_timer.timer); | |
1156 | llc_conn_set_p_flag(sk, 0); | |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1161 | { | |
1162 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) | |
1167 | { | |
1168 | int acked; | |
1169 | u16 unacked = 0; | |
1170 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1171 | struct llc_sock *llc = llc_sk(sk); | |
1172 | ||
1173 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); | |
1174 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); | |
1175 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ | |
1176 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { | |
1177 | llc->retry_count = 0; | |
1178 | del_timer(&llc->ack_timer.timer); | |
1179 | if (llc->failed_data_req) { | |
1180 | /* already, we did not accept data from upper layer | |
1181 | * (tx_window full or unacceptable state). Now, we | |
1182 | * can send data and must inform to upper layer. | |
1183 | */ | |
1184 | llc->failed_data_req = 0; | |
1185 | llc_conn_ac_data_confirm(sk, skb); | |
1186 | } | |
1187 | if (unacked) | |
1188 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1189 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1190 | } else if (llc->failed_data_req) { |
1191 | u8 f_bit; | |
1192 | ||
1193 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1194 | if (f_bit == 1) { | |
1195 | llc->failed_data_req = 0; | |
1196 | llc_conn_ac_data_confirm(sk, skb); | |
1197 | } | |
1198 | } | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) | |
1203 | { | |
1204 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1205 | ||
1206 | if (LLC_PDU_IS_RSP(pdu)) { | |
1207 | u8 f_bit; | |
1208 | ||
1209 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1210 | if (f_bit) { | |
1211 | llc_conn_set_p_flag(sk, 0); | |
1212 | llc_conn_ac_stop_p_timer(sk, skb); | |
1213 | } | |
1214 | } | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) | |
1219 | { | |
1220 | llc_sk(sk)->data_flag = 2; | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) | |
1225 | { | |
1226 | llc_sk(sk)->data_flag = 0; | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) | |
1231 | { | |
1232 | llc_sk(sk)->data_flag = 1; | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, | |
1237 | struct sk_buff *skb) | |
1238 | { | |
1239 | if (!llc_sk(sk)->data_flag) | |
1240 | llc_sk(sk)->data_flag = 1; | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) | |
1245 | { | |
1246 | llc_conn_set_p_flag(sk, 0); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) | |
1251 | { | |
1252 | llc_conn_set_p_flag(sk, 1); | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) | |
1257 | { | |
1258 | llc_sk(sk)->remote_busy_flag = 0; | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) | |
1263 | { | |
1264 | llc_sk(sk)->cause_flag = 0; | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) | |
1269 | { | |
1270 | llc_sk(sk)->cause_flag = 1; | |
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) | |
1275 | { | |
1276 | llc_sk(sk)->retry_count = 0; | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) | |
1281 | { | |
1282 | llc_sk(sk)->retry_count++; | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) | |
1287 | { | |
1288 | llc_sk(sk)->vR = 0; | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) | |
1293 | { | |
1294 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) | |
1299 | { | |
1300 | llc_sk(sk)->vS = 0; | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) | |
1305 | { | |
1306 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; | |
1307 | return 0; | |
1308 | } | |
1309 | ||
2928c19e | 1310 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
1311 | { |
1312 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128; | |
1313 | return 0; | |
1314 | } | |
1315 | ||
e0dd5519 | 1316 | static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) |
1da177e4 LT |
1317 | { |
1318 | struct sock *sk = (struct sock *)timeout_data; | |
1319 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1320 | ||
1321 | bh_lock_sock(sk); | |
1322 | if (skb) { | |
1323 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1324 | ||
04e4223f | 1325 | skb_set_owner_r(skb, sk); |
e0dd5519 | 1326 | ev->type = type; |
1da177e4 LT |
1327 | llc_process_tmr_ev(sk, skb); |
1328 | } | |
1329 | bh_unlock_sock(sk); | |
1330 | } | |
1331 | ||
e0dd5519 | 1332 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) |
1da177e4 | 1333 | { |
e0dd5519 ACM |
1334 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); |
1335 | } | |
1da177e4 | 1336 | |
e0dd5519 ACM |
1337 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) |
1338 | { | |
1339 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); | |
1da177e4 LT |
1340 | } |
1341 | ||
1342 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) | |
1343 | { | |
e0dd5519 | 1344 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) | |
1348 | { | |
e0dd5519 | 1349 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); |
1da177e4 LT |
1350 | } |
1351 | ||
1352 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) | |
1353 | { | |
1354 | llc_sk(sk)->X = llc_sk(sk)->vS; | |
1355 | llc_conn_ac_set_vs_nr(sk, skb); | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) | |
1360 | { | |
1361 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1362 | u8 nr = PDU_SUPV_GET_Nr(pdu); | |
1363 | ||
1364 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) | |
1365 | llc_conn_ac_set_vs_nr(sk, skb); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | /* | |
1370 | * Non-standard actions; these not contained in IEEE specification; for | |
1371 | * our own usage | |
1372 | */ | |
1373 | /** | |
1374 | * llc_conn_disc - removes connection from SAP list and frees it | |
1375 | * @sk: closed connection | |
1376 | * @skb: occurred event | |
1377 | */ | |
1378 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) | |
1379 | { | |
1380 | /* FIXME: this thing seems to want to die */ | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | /** | |
1385 | * llc_conn_reset - resets connection | |
1386 | * @sk : reseting connection. | |
1387 | * @skb: occurred event. | |
1388 | * | |
1389 | * Stop all timers, empty all queues and reset all flags. | |
1390 | */ | |
1391 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) | |
1392 | { | |
1393 | llc_sk_reset(sk); | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | /** | |
1398 | * llc_circular_between - designates that b is between a and c or not | |
1399 | * @a: lower bound | |
1400 | * @b: element to see if is between a and b | |
1401 | * @c: upper bound | |
1402 | * | |
1403 | * This function designates that b is between a and c or not (for example, | |
1404 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 | |
1405 | * otherwise. | |
1406 | */ | |
1407 | u8 llc_circular_between(u8 a, u8 b, u8 c) | |
1408 | { | |
1409 | b = b - a; | |
1410 | c = c - a; | |
1411 | return b <= c; | |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * llc_process_tmr_ev - timer backend | |
1416 | * @sk: active connection | |
1417 | * @skb: occurred event | |
1418 | * | |
1419 | * This function is called from timer callback functions. When connection | |
1420 | * is busy (during sending a data frame) timer expiration event must be | |
1421 | * queued. Otherwise this event can be sent to connection state machine. | |
1422 | * Queued events will process by llc_backlog_rcv function after sending | |
1423 | * data frame. | |
1424 | */ | |
1425 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) | |
1426 | { | |
1427 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { | |
1428 | printk(KERN_WARNING "%s: timer called on closed connection\n", | |
1429 | __FUNCTION__); | |
1430 | kfree_skb(skb); | |
1431 | } else { | |
1432 | if (!sock_owned_by_user(sk)) | |
1433 | llc_conn_state_process(sk, skb); | |
1434 | else { | |
1435 | llc_set_backlog_type(skb, LLC_EVENT); | |
1436 | sk_add_backlog(sk, skb); | |
1437 | } | |
1438 | } | |
1439 | } |