Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
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 | { | |
d389424e ACM |
62 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
63 | ||
64 | ev->ind_prim = LLC_CONN_PRIM; | |
65 | return 0; | |
1da177e4 LT |
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; | |
bdcc66cc | 109 | else |
1da177e4 | 110 | rc = -EINVAL; |
1da177e4 LT |
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; | |
1da177e4 LT |
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; | |
bdcc66cc | 156 | } |
1da177e4 LT |
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; | |
1d67e650 | 200 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 201 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
202 | |
203 | if (nskb) { | |
1da177e4 LT |
204 | struct llc_sap *sap = llc->sap; |
205 | ||
1da177e4 LT |
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); | |
249ff1c6 | 210 | if (unlikely(rc)) |
1da177e4 LT |
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; | |
1d67e650 | 225 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 226 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
227 | |
228 | if (nskb) { | |
1da177e4 LT |
229 | struct llc_sap *sap = llc->sap; |
230 | u8 f_bit; | |
231 | ||
1da177e4 LT |
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); | |
249ff1c6 | 237 | if (unlikely(rc)) |
1da177e4 LT |
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; | |
1d67e650 | 251 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 252 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
253 | |
254 | if (nskb) { | |
1da177e4 | 255 | struct llc_sap *sap = llc->sap; |
1da177e4 | 256 | |
1da177e4 LT |
257 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
258 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 259 | llc_pdu_init_as_dm_rsp(nskb, 1); |
1da177e4 | 260 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 261 | if (unlikely(rc)) |
1da177e4 LT |
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; | |
f83f1768 JP |
285 | nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
286 | sizeof(struct llc_frmr_info)); | |
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); |
f83f1768 JP |
310 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
311 | sizeof(struct llc_frmr_info)); | |
1da177e4 LT |
312 | |
313 | if (nskb) { | |
1da177e4 LT |
314 | struct llc_sap *sap = llc->sap; |
315 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
316 | ||
1da177e4 LT |
317 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
318 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 319 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
1da177e4 LT |
320 | llc->vR, INCORRECT); |
321 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 322 | if (unlikely(rc)) |
1da177e4 LT |
323 | goto free; |
324 | llc_conn_send_pdu(sk, nskb); | |
325 | } | |
326 | out: | |
327 | return rc; | |
328 | free: | |
329 | kfree_skb(nskb); | |
330 | goto out; | |
331 | } | |
332 | ||
333 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
334 | { | |
335 | u8 f_bit; | |
336 | int rc = -ENOBUFS; | |
337 | struct sk_buff *nskb; | |
1d67e650 | 338 | struct llc_sock *llc = llc_sk(sk); |
1da177e4 LT |
339 | |
340 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
f83f1768 JP |
341 | nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
342 | sizeof(struct llc_frmr_info)); | |
1da177e4 | 343 | if (nskb) { |
1da177e4 LT |
344 | struct llc_sap *sap = llc->sap; |
345 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
346 | ||
1da177e4 LT |
347 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
348 | llc->daddr.lsap, LLC_PDU_RSP); | |
349 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
350 | llc->vR, INCORRECT); | |
351 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 352 | if (unlikely(rc)) |
1da177e4 LT |
353 | goto free; |
354 | llc_conn_send_pdu(sk, nskb); | |
355 | } | |
356 | out: | |
357 | return rc; | |
358 | free: | |
359 | kfree_skb(nskb); | |
360 | goto out; | |
361 | } | |
362 | ||
363 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
364 | { | |
365 | int rc; | |
366 | struct llc_sock *llc = llc_sk(sk); | |
367 | struct llc_sap *sap = llc->sap; | |
368 | ||
369 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
370 | llc->daddr.lsap, LLC_PDU_CMD); | |
371 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
372 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 373 | if (likely(!rc)) { |
1da177e4 LT |
374 | llc_conn_send_pdu(sk, skb); |
375 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
376 | } | |
377 | return rc; | |
378 | } | |
379 | ||
380 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
381 | { | |
382 | int rc; | |
383 | struct llc_sock *llc = llc_sk(sk); | |
384 | struct llc_sap *sap = llc->sap; | |
385 | ||
386 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
387 | llc->daddr.lsap, LLC_PDU_CMD); | |
388 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
389 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 390 | if (likely(!rc)) { |
1da177e4 LT |
391 | llc_conn_send_pdu(sk, skb); |
392 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
393 | } | |
394 | return rc; | |
395 | } | |
396 | ||
397 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
398 | { | |
399 | int rc; | |
400 | struct llc_sock *llc = llc_sk(sk); | |
401 | struct llc_sap *sap = llc->sap; | |
402 | ||
403 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
404 | llc->daddr.lsap, LLC_PDU_CMD); | |
405 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
406 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 407 | if (likely(!rc)) { |
1da177e4 LT |
408 | llc_conn_send_pdu(sk, skb); |
409 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
410 | } | |
411 | return 0; | |
412 | } | |
413 | ||
414 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
415 | { | |
416 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
417 | u8 nr = LLC_I_GET_NR(pdu); | |
418 | ||
419 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
420 | return 0; | |
421 | } | |
422 | ||
423 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
424 | struct sk_buff *skb) | |
425 | { | |
426 | u8 nr; | |
427 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
428 | int rc = -ENOBUFS; | |
1d67e650 | 429 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 430 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
431 | |
432 | if (nskb) { | |
1da177e4 LT |
433 | struct llc_sap *sap = llc->sap; |
434 | ||
1da177e4 LT |
435 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
436 | llc->daddr.lsap, LLC_PDU_RSP); | |
437 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
438 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 439 | if (likely(!rc)) |
1da177e4 LT |
440 | llc_conn_send_pdu(sk, nskb); |
441 | else | |
442 | kfree_skb(skb); | |
443 | } | |
444 | if (rc) { | |
445 | nr = LLC_I_GET_NR(pdu); | |
446 | rc = 0; | |
447 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
448 | } | |
449 | return rc; | |
450 | } | |
451 | ||
452 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
453 | { | |
454 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
455 | u8 nr = LLC_I_GET_NR(pdu); | |
456 | ||
457 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
462 | { | |
463 | int rc = -ENOBUFS; | |
1d67e650 | 464 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 465 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
466 | |
467 | if (nskb) { | |
1da177e4 LT |
468 | struct llc_sap *sap = llc->sap; |
469 | ||
1da177e4 LT |
470 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
471 | llc->daddr.lsap, LLC_PDU_CMD); | |
472 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
473 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 474 | if (unlikely(rc)) |
1da177e4 LT |
475 | goto free; |
476 | llc_conn_send_pdu(sk, nskb); | |
477 | } | |
478 | out: | |
479 | return rc; | |
480 | free: | |
481 | kfree_skb(nskb); | |
482 | goto out; | |
483 | } | |
484 | ||
485 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
486 | { | |
487 | int rc = -ENOBUFS; | |
1d67e650 | 488 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 489 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
490 | |
491 | if (nskb) { | |
1da177e4 LT |
492 | struct llc_sap *sap = llc->sap; |
493 | ||
1da177e4 LT |
494 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
495 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 496 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
1da177e4 | 497 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 498 | if (unlikely(rc)) |
1da177e4 LT |
499 | goto free; |
500 | llc_conn_send_pdu(sk, nskb); | |
501 | } | |
502 | out: | |
503 | return rc; | |
504 | free: | |
505 | kfree_skb(nskb); | |
506 | goto out; | |
507 | } | |
508 | ||
509 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
510 | { | |
511 | int rc = -ENOBUFS; | |
1d67e650 | 512 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 513 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
514 | |
515 | if (nskb) { | |
1da177e4 | 516 | struct llc_sap *sap = llc->sap; |
1da177e4 | 517 | |
1da177e4 LT |
518 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
519 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 520 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
1da177e4 | 521 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 522 | if (unlikely(rc)) |
1da177e4 LT |
523 | goto free; |
524 | llc_conn_send_pdu(sk, nskb); | |
525 | } | |
526 | out: | |
527 | return rc; | |
528 | free: | |
529 | kfree_skb(nskb); | |
530 | goto out; | |
531 | } | |
532 | ||
533 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
534 | { | |
535 | int rc = -ENOBUFS; | |
1d67e650 | 536 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 537 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
538 | |
539 | if (nskb) { | |
1da177e4 LT |
540 | struct llc_sap *sap = llc->sap; |
541 | ||
1da177e4 LT |
542 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
543 | llc->daddr.lsap, LLC_PDU_CMD); | |
544 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
545 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 546 | if (unlikely(rc)) |
1da177e4 LT |
547 | goto free; |
548 | llc_conn_send_pdu(sk, nskb); | |
549 | } | |
550 | out: | |
551 | return rc; | |
552 | free: | |
553 | kfree_skb(nskb); | |
554 | goto out; | |
555 | } | |
556 | ||
557 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
558 | { | |
559 | int rc = -ENOBUFS; | |
1d67e650 | 560 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 561 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
562 | |
563 | if (nskb) { | |
1da177e4 | 564 | struct llc_sap *sap = llc->sap; |
1da177e4 | 565 | |
1da177e4 LT |
566 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
567 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 568 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
1da177e4 | 569 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 570 | if (unlikely(rc)) |
1da177e4 LT |
571 | goto free; |
572 | llc_conn_send_pdu(sk, nskb); | |
573 | } | |
574 | out: | |
575 | return rc; | |
576 | free: | |
577 | kfree_skb(nskb); | |
578 | goto out; | |
579 | } | |
580 | ||
581 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
582 | { | |
583 | int rc = -ENOBUFS; | |
1d67e650 | 584 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 585 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
586 | |
587 | if (nskb) { | |
1da177e4 LT |
588 | struct llc_sap *sap = llc->sap; |
589 | ||
1da177e4 LT |
590 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
591 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 592 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
1da177e4 | 593 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 594 | if (unlikely(rc)) |
1da177e4 LT |
595 | goto free; |
596 | llc_conn_send_pdu(sk, nskb); | |
597 | } | |
598 | out: | |
599 | return rc; | |
600 | free: | |
601 | kfree_skb(nskb); | |
602 | goto out; | |
603 | } | |
604 | ||
605 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
606 | { | |
607 | struct llc_sock *llc = llc_sk(sk); | |
608 | ||
609 | if (!llc->remote_busy_flag) { | |
610 | llc->remote_busy_flag = 1; | |
611 | mod_timer(&llc->busy_state_timer.timer, | |
590232a7 | 612 | jiffies + llc->busy_state_timer.expire); |
1da177e4 LT |
613 | } |
614 | return 0; | |
615 | } | |
616 | ||
617 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
618 | { | |
619 | int rc = -ENOBUFS; | |
1d67e650 | 620 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 621 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
622 | |
623 | if (nskb) { | |
1da177e4 LT |
624 | struct llc_sap *sap = llc->sap; |
625 | ||
1da177e4 LT |
626 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
627 | llc->daddr.lsap, LLC_PDU_RSP); | |
628 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
629 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 630 | if (unlikely(rc)) |
1da177e4 LT |
631 | goto free; |
632 | llc_conn_send_pdu(sk, nskb); | |
633 | } | |
634 | out: | |
635 | return rc; | |
636 | free: | |
637 | kfree_skb(nskb); | |
638 | goto out; | |
639 | } | |
640 | ||
641 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
642 | { | |
643 | int rc = -ENOBUFS; | |
1d67e650 | 644 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 645 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
646 | |
647 | if (nskb) { | |
1da177e4 LT |
648 | struct llc_sap *sap = llc->sap; |
649 | ||
1da177e4 LT |
650 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
651 | llc->daddr.lsap, LLC_PDU_CMD); | |
652 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
653 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 654 | if (unlikely(rc)) |
1da177e4 LT |
655 | goto free; |
656 | llc_conn_send_pdu(sk, nskb); | |
657 | } | |
658 | out: | |
659 | return rc; | |
660 | free: | |
661 | kfree_skb(nskb); | |
662 | goto out; | |
663 | } | |
664 | ||
665 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
666 | { | |
667 | int rc = -ENOBUFS; | |
1d67e650 | 668 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 669 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
670 | |
671 | if (nskb) { | |
1da177e4 LT |
672 | struct llc_sap *sap = llc->sap; |
673 | u8 f_bit = 1; | |
674 | ||
1da177e4 LT |
675 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
676 | llc->daddr.lsap, LLC_PDU_RSP); | |
677 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
678 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 679 | if (unlikely(rc)) |
1da177e4 LT |
680 | goto free; |
681 | llc_conn_send_pdu(sk, nskb); | |
682 | } | |
683 | out: | |
684 | return rc; | |
685 | free: | |
686 | kfree_skb(nskb); | |
687 | goto out; | |
688 | } | |
689 | ||
690 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
691 | { | |
692 | int rc = -ENOBUFS; | |
1d67e650 | 693 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 694 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
695 | |
696 | if (nskb) { | |
1da177e4 | 697 | struct llc_sap *sap = llc->sap; |
1da177e4 | 698 | |
1da177e4 LT |
699 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
700 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 701 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
1da177e4 | 702 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 703 | if (unlikely(rc)) |
1da177e4 LT |
704 | goto free; |
705 | llc_conn_send_pdu(sk, nskb); | |
706 | } | |
707 | out: | |
708 | return rc; | |
709 | free: | |
710 | kfree_skb(nskb); | |
711 | goto out; | |
712 | } | |
713 | ||
714 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
715 | { | |
716 | int rc = -ENOBUFS; | |
1d67e650 | 717 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 718 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
719 | |
720 | if (nskb) { | |
1da177e4 LT |
721 | struct llc_sap *sap = llc->sap; |
722 | ||
1da177e4 LT |
723 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
724 | llc->daddr.lsap, LLC_PDU_RSP); | |
725 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
726 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 727 | if (unlikely(rc)) |
1da177e4 LT |
728 | goto free; |
729 | llc_conn_send_pdu(sk, nskb); | |
730 | } | |
731 | out: | |
732 | return rc; | |
733 | free: | |
734 | kfree_skb(nskb); | |
735 | goto out; | |
736 | } | |
737 | ||
738 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
739 | { | |
740 | int rc = -ENOBUFS; | |
1d67e650 | 741 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 742 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
743 | |
744 | if (nskb) { | |
1da177e4 LT |
745 | struct llc_sap *sap = llc->sap; |
746 | ||
1da177e4 LT |
747 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
748 | llc->daddr.lsap, LLC_PDU_RSP); | |
749 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
750 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 751 | if (unlikely(rc)) |
1da177e4 LT |
752 | goto free; |
753 | llc_conn_send_pdu(sk, nskb); | |
754 | } | |
755 | out: | |
756 | return rc; | |
757 | free: | |
758 | kfree_skb(nskb); | |
759 | goto out; | |
760 | } | |
761 | ||
762 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
763 | { | |
764 | int state_changed = llc_sk(sk)->p_flag && !value; | |
765 | ||
766 | llc_sk(sk)->p_flag = value; | |
767 | ||
768 | if (state_changed) | |
769 | sk->sk_state_change(sk); | |
770 | } | |
771 | ||
772 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
773 | { | |
774 | int rc = -ENOBUFS; | |
1da177e4 | 775 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 776 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
777 | |
778 | if (nskb) { | |
779 | struct llc_sap *sap = llc->sap; | |
780 | u8 *dmac = llc->daddr.mac; | |
781 | ||
782 | if (llc->dev->flags & IFF_LOOPBACK) | |
783 | dmac = llc->dev->dev_addr; | |
1da177e4 LT |
784 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
785 | llc->daddr.lsap, LLC_PDU_CMD); | |
786 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
787 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
249ff1c6 | 788 | if (unlikely(rc)) |
1da177e4 LT |
789 | goto free; |
790 | llc_conn_send_pdu(sk, nskb); | |
791 | llc_conn_set_p_flag(sk, 1); | |
792 | } | |
793 | out: | |
794 | return rc; | |
795 | free: | |
796 | kfree_skb(nskb); | |
797 | goto out; | |
798 | } | |
799 | ||
800 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
801 | { | |
802 | u8 f_bit; | |
803 | int rc = -ENOBUFS; | |
1d67e650 | 804 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 805 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
806 | |
807 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
808 | if (nskb) { | |
1da177e4 LT |
809 | struct llc_sap *sap = llc->sap; |
810 | ||
811 | nskb->dev = llc->dev; | |
812 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
813 | llc->daddr.lsap, LLC_PDU_RSP); | |
814 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
815 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 816 | if (unlikely(rc)) |
1da177e4 LT |
817 | goto free; |
818 | llc_conn_send_pdu(sk, nskb); | |
819 | } | |
820 | out: | |
821 | return rc; | |
822 | free: | |
823 | kfree_skb(nskb); | |
824 | goto out; | |
825 | } | |
826 | ||
827 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
828 | { | |
829 | llc_sk(sk)->s_flag = 0; | |
830 | return 0; | |
831 | } | |
832 | ||
833 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
834 | { | |
835 | llc_sk(sk)->s_flag = 1; | |
836 | return 0; | |
837 | } | |
838 | ||
839 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
840 | { | |
841 | struct llc_sock *llc = llc_sk(sk); | |
842 | ||
843 | llc_conn_set_p_flag(sk, 1); | |
844 | mod_timer(&llc->pf_cycle_timer.timer, | |
590232a7 | 845 | jiffies + llc->pf_cycle_timer.expire); |
1da177e4 LT |
846 | return 0; |
847 | } | |
848 | ||
849 | /** | |
850 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
851 | * @sk: current connection structure | |
852 | * @skb: current event | |
853 | * | |
854 | * Checks number of received PDUs which have not been acknowledged, yet, | |
855 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
856 | * sends an RR response as acknowledgement for them. Returns 0 for | |
857 | * success, 1 otherwise. | |
858 | */ | |
859 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
860 | { | |
861 | u8 pf_bit; | |
862 | struct llc_sock *llc = llc_sk(sk); | |
863 | ||
864 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
865 | llc->ack_pf |= pf_bit & 1; | |
866 | if (!llc->ack_must_be_send) { | |
867 | llc->first_pdu_Ns = llc->vR; | |
868 | llc->ack_must_be_send = 1; | |
869 | llc->ack_pf = pf_bit & 1; | |
870 | } | |
59c6196e JF |
871 | if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO) |
872 | % LLC_2_SEQ_NBR_MODULO) >= llc->npta) { | |
1da177e4 LT |
873 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); |
874 | llc->ack_must_be_send = 0; | |
875 | llc->ack_pf = 0; | |
876 | llc_conn_ac_inc_npta_value(sk, skb); | |
877 | } | |
878 | return 0; | |
879 | } | |
880 | ||
881 | /** | |
882 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag | |
883 | * @sk: current connection structure | |
884 | * @skb: current event | |
885 | * | |
886 | * This action resets ack_must_be_send flag of given connection, this flag | |
887 | * indicates if there is any PDU which has not been acknowledged yet. | |
888 | * Returns 0 for success, 1 otherwise. | |
889 | */ | |
890 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) | |
891 | { | |
892 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; | |
893 | return 0; | |
894 | } | |
895 | ||
896 | /** | |
897 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs | |
898 | * @sk: current connection structure | |
899 | * @skb: current event | |
900 | * | |
901 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to | |
902 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is | |
903 | * set to one if one PDU with p-bit set to one is received. Returns 0 for | |
904 | * success, 1 otherwise. | |
905 | */ | |
906 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, | |
907 | struct sk_buff *skb) | |
908 | { | |
909 | int rc; | |
910 | struct llc_sock *llc = llc_sk(sk); | |
911 | struct llc_sap *sap = llc->sap; | |
912 | ||
913 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
914 | llc->daddr.lsap, LLC_PDU_RSP); | |
915 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); | |
916 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 917 | if (likely(!rc)) { |
1da177e4 LT |
918 | llc_conn_send_pdu(sk, skb); |
919 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
920 | } | |
921 | return rc; | |
922 | } | |
923 | ||
924 | /** | |
925 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs | |
926 | * @sk: current connection structure. | |
927 | * @skb: current event. | |
928 | * | |
929 | * This action sends an I-format PDU as acknowledge to received PDUs which | |
930 | * have not been acknowledged, yet, if there is any. By using of this | |
931 | * action number of acknowledgements decreases, this technic is called | |
932 | * piggy backing. Returns 0 for success, 1 otherwise. | |
933 | */ | |
934 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) | |
935 | { | |
936 | struct llc_sock *llc = llc_sk(sk); | |
937 | ||
938 | if (llc->ack_must_be_send) { | |
939 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); | |
940 | llc->ack_must_be_send = 0 ; | |
941 | llc->ack_pf = 0; | |
942 | } else | |
943 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); | |
944 | return 0; | |
945 | } | |
946 | ||
947 | /** | |
948 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked | |
949 | * @sk: current connection structure. | |
950 | * @skb: current event. | |
951 | * | |
952 | * This action sends an RR response with f-bit set to ack_pf flag as | |
953 | * acknowledge to all received PDUs which have not been acknowledged, yet, | |
954 | * if there is any. ack_pf flag indicates if a PDU has been received with | |
955 | * p-bit set to one. Returns 0 for success, 1 otherwise. | |
956 | */ | |
957 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
958 | struct sk_buff *skb) | |
959 | { | |
960 | int rc = -ENOBUFS; | |
1d67e650 | 961 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 962 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
963 | |
964 | if (nskb) { | |
1da177e4 LT |
965 | struct llc_sap *sap = llc->sap; |
966 | ||
1da177e4 LT |
967 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
968 | llc->daddr.lsap, LLC_PDU_RSP); | |
969 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); | |
970 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 971 | if (unlikely(rc)) |
1da177e4 LT |
972 | goto free; |
973 | llc_conn_send_pdu(sk, nskb); | |
974 | } | |
975 | out: | |
976 | return rc; | |
977 | free: | |
978 | kfree_skb(nskb); | |
979 | goto out; | |
980 | } | |
981 | ||
982 | /** | |
983 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater | |
984 | * @sk: current connection structure. | |
985 | * @skb: current event. | |
986 | * | |
987 | * After "inc_cntr" times calling of this action, "npta" increase by one. | |
988 | * this action tries to make vale of "npta" greater as possible; number of | |
989 | * acknowledgements decreases by increasing of "npta". Returns 0 for | |
990 | * success, 1 otherwise. | |
991 | */ | |
992 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) | |
993 | { | |
994 | struct llc_sock *llc = llc_sk(sk); | |
995 | ||
996 | if (!llc->inc_cntr) { | |
997 | llc->dec_step = 0; | |
998 | llc->dec_cntr = llc->inc_cntr = 2; | |
999 | ++llc->npta; | |
38199824 DM |
1000 | if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1001 | llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; | |
1da177e4 LT |
1002 | } else |
1003 | --llc->inc_cntr; | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one | |
1009 | * @sk: current connection structure. | |
1010 | * @skb: current event. | |
1011 | * | |
1012 | * After receiving "dec_cntr" times RR command, this action decreases | |
1013 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1014 | */ | |
1015 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) | |
1016 | { | |
1017 | struct llc_sock *llc = llc_sk(sk); | |
1018 | ||
1019 | if (!llc->connect_step && !llc->remote_busy_flag) { | |
1020 | if (!llc->dec_step) { | |
1021 | if (!llc->dec_cntr) { | |
1022 | llc->inc_cntr = llc->dec_cntr = 2; | |
1023 | if (llc->npta > 0) | |
1024 | llc->npta = llc->npta - 1; | |
1025 | } else | |
1026 | llc->dec_cntr -=1; | |
1027 | } | |
1028 | } else | |
1029 | llc->connect_step = 0 ; | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | /** | |
1034 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one | |
1035 | * @sk: current connection structure. | |
1036 | * @skb: current event. | |
1037 | * | |
1038 | * After receiving "dec_cntr" times RNR command, this action decreases | |
1039 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1040 | */ | |
1041 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) | |
1042 | { | |
1043 | struct llc_sock *llc = llc_sk(sk); | |
1044 | ||
1045 | if (llc->remote_busy_flag) | |
1046 | if (!llc->dec_step) { | |
1047 | if (!llc->dec_cntr) { | |
1048 | llc->inc_cntr = llc->dec_cntr = 2; | |
1049 | if (llc->npta > 0) | |
1050 | --llc->npta; | |
1051 | } else | |
1052 | --llc->dec_cntr; | |
1053 | } | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * llc_conn_ac_dec_tx_win_size - decreases tx window size | |
1059 | * @sk: current connection structure. | |
1060 | * @skb: current event. | |
1061 | * | |
1062 | * After receiving of a REJ command or response, transmit window size is | |
1063 | * decreased by number of PDUs which are outstanding yet. Returns 0 for | |
1064 | * success, 1 otherwise. | |
1065 | */ | |
1066 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1067 | { | |
1068 | struct llc_sock *llc = llc_sk(sk); | |
1069 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); | |
1070 | ||
59c6196e JF |
1071 | if (llc->k - unacked_pdu < 1) |
1072 | llc->k = 1; | |
1073 | else | |
1074 | llc->k -= unacked_pdu; | |
1da177e4 LT |
1075 | return 0; |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1080 | * @sk: current connection structure. | |
1081 | * @skb: current event. | |
1082 | * | |
1083 | * After receiving an RR response with f-bit set to one, transmit window | |
1084 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1085 | */ | |
1086 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1087 | { | |
1088 | struct llc_sock *llc = llc_sk(sk); | |
1089 | ||
1090 | llc->k += 1; | |
38199824 DM |
1091 | if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1092 | llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; | |
1da177e4 LT |
1093 | return 0; |
1094 | } | |
1095 | ||
1096 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1097 | { | |
1098 | struct llc_sock *llc = llc_sk(sk); | |
1099 | ||
1100 | del_timer(&llc->pf_cycle_timer.timer); | |
1101 | del_timer(&llc->ack_timer.timer); | |
1102 | del_timer(&llc->rej_sent_timer.timer); | |
1103 | del_timer(&llc->busy_state_timer.timer); | |
1104 | llc->ack_must_be_send = 0; | |
1105 | llc->ack_pf = 0; | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1110 | { | |
1111 | struct llc_sock *llc = llc_sk(sk); | |
1112 | ||
1113 | del_timer(&llc->rej_sent_timer.timer); | |
1114 | del_timer(&llc->pf_cycle_timer.timer); | |
1115 | del_timer(&llc->busy_state_timer.timer); | |
1116 | llc->ack_must_be_send = 0; | |
1117 | llc->ack_pf = 0; | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1122 | { | |
1123 | struct llc_sock *llc = llc_sk(sk); | |
1124 | ||
590232a7 | 1125 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1126 | return 0; |
1127 | } | |
1128 | ||
1129 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1130 | { | |
1131 | struct llc_sock *llc = llc_sk(sk); | |
1132 | ||
1133 | mod_timer(&llc->rej_sent_timer.timer, | |
590232a7 | 1134 | jiffies + llc->rej_sent_timer.expire); |
1da177e4 LT |
1135 | return 0; |
1136 | } | |
1137 | ||
1138 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, | |
1139 | struct sk_buff *skb) | |
1140 | { | |
1141 | struct llc_sock *llc = llc_sk(sk); | |
1142 | ||
1143 | if (!timer_pending(&llc->ack_timer.timer)) | |
1144 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1145 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1146 | return 0; |
1147 | } | |
1148 | ||
1149 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1150 | { | |
1151 | del_timer(&llc_sk(sk)->ack_timer.timer); | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) | |
1156 | { | |
1157 | struct llc_sock *llc = llc_sk(sk); | |
1158 | ||
1159 | del_timer(&llc->pf_cycle_timer.timer); | |
1160 | llc_conn_set_p_flag(sk, 0); | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1165 | { | |
1166 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) | |
1171 | { | |
1172 | int acked; | |
1173 | u16 unacked = 0; | |
1174 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1175 | struct llc_sock *llc = llc_sk(sk); | |
1176 | ||
1177 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); | |
1178 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); | |
1179 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ | |
1180 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { | |
1181 | llc->retry_count = 0; | |
1182 | del_timer(&llc->ack_timer.timer); | |
1183 | if (llc->failed_data_req) { | |
1184 | /* already, we did not accept data from upper layer | |
1185 | * (tx_window full or unacceptable state). Now, we | |
1186 | * can send data and must inform to upper layer. | |
1187 | */ | |
1188 | llc->failed_data_req = 0; | |
1189 | llc_conn_ac_data_confirm(sk, skb); | |
1190 | } | |
1191 | if (unacked) | |
1192 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1193 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1194 | } else if (llc->failed_data_req) { |
1195 | u8 f_bit; | |
1196 | ||
1197 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1198 | if (f_bit == 1) { | |
1199 | llc->failed_data_req = 0; | |
1200 | llc_conn_ac_data_confirm(sk, skb); | |
1201 | } | |
1202 | } | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) | |
1207 | { | |
1208 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1209 | ||
1210 | if (LLC_PDU_IS_RSP(pdu)) { | |
1211 | u8 f_bit; | |
1212 | ||
1213 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1214 | if (f_bit) { | |
1215 | llc_conn_set_p_flag(sk, 0); | |
1216 | llc_conn_ac_stop_p_timer(sk, skb); | |
1217 | } | |
1218 | } | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) | |
1223 | { | |
1224 | llc_sk(sk)->data_flag = 2; | |
1225 | return 0; | |
1226 | } | |
1227 | ||
1228 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) | |
1229 | { | |
1230 | llc_sk(sk)->data_flag = 0; | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) | |
1235 | { | |
1236 | llc_sk(sk)->data_flag = 1; | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, | |
1241 | struct sk_buff *skb) | |
1242 | { | |
1243 | if (!llc_sk(sk)->data_flag) | |
1244 | llc_sk(sk)->data_flag = 1; | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) | |
1249 | { | |
1250 | llc_conn_set_p_flag(sk, 0); | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) | |
1255 | { | |
1256 | llc_conn_set_p_flag(sk, 1); | |
1257 | return 0; | |
1258 | } | |
1259 | ||
1260 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) | |
1261 | { | |
1262 | llc_sk(sk)->remote_busy_flag = 0; | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) | |
1267 | { | |
1268 | llc_sk(sk)->cause_flag = 0; | |
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) | |
1273 | { | |
1274 | llc_sk(sk)->cause_flag = 1; | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) | |
1279 | { | |
1280 | llc_sk(sk)->retry_count = 0; | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) | |
1285 | { | |
1286 | llc_sk(sk)->retry_count++; | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) | |
1291 | { | |
1292 | llc_sk(sk)->vR = 0; | |
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) | |
1297 | { | |
1298 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) | |
1303 | { | |
1304 | llc_sk(sk)->vS = 0; | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) | |
1309 | { | |
1310 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; | |
1311 | return 0; | |
1312 | } | |
1313 | ||
2928c19e | 1314 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1315 | { |
59c6196e | 1316 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO; |
1da177e4 LT |
1317 | return 0; |
1318 | } | |
1319 | ||
e0dd5519 | 1320 | static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) |
1da177e4 LT |
1321 | { |
1322 | struct sock *sk = (struct sock *)timeout_data; | |
1323 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1324 | ||
1325 | bh_lock_sock(sk); | |
1326 | if (skb) { | |
1327 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1328 | ||
04e4223f | 1329 | skb_set_owner_r(skb, sk); |
e0dd5519 | 1330 | ev->type = type; |
1da177e4 LT |
1331 | llc_process_tmr_ev(sk, skb); |
1332 | } | |
1333 | bh_unlock_sock(sk); | |
1334 | } | |
1335 | ||
e0dd5519 | 1336 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) |
1da177e4 | 1337 | { |
e0dd5519 ACM |
1338 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); |
1339 | } | |
1da177e4 | 1340 | |
e0dd5519 ACM |
1341 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) |
1342 | { | |
1343 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); | |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) | |
1347 | { | |
e0dd5519 | 1348 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); |
1da177e4 LT |
1349 | } |
1350 | ||
1351 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) | |
1352 | { | |
e0dd5519 | 1353 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); |
1da177e4 LT |
1354 | } |
1355 | ||
1356 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) | |
1357 | { | |
1358 | llc_sk(sk)->X = llc_sk(sk)->vS; | |
1359 | llc_conn_ac_set_vs_nr(sk, skb); | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) | |
1364 | { | |
1365 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1366 | u8 nr = PDU_SUPV_GET_Nr(pdu); | |
1367 | ||
1368 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) | |
1369 | llc_conn_ac_set_vs_nr(sk, skb); | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Non-standard actions; these not contained in IEEE specification; for | |
1375 | * our own usage | |
1376 | */ | |
1377 | /** | |
1378 | * llc_conn_disc - removes connection from SAP list and frees it | |
1379 | * @sk: closed connection | |
1380 | * @skb: occurred event | |
1381 | */ | |
1382 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) | |
1383 | { | |
1384 | /* FIXME: this thing seems to want to die */ | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | /** | |
1389 | * llc_conn_reset - resets connection | |
1390 | * @sk : reseting connection. | |
1391 | * @skb: occurred event. | |
1392 | * | |
1393 | * Stop all timers, empty all queues and reset all flags. | |
1394 | */ | |
1395 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) | |
1396 | { | |
1397 | llc_sk_reset(sk); | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * llc_circular_between - designates that b is between a and c or not | |
1403 | * @a: lower bound | |
1404 | * @b: element to see if is between a and b | |
1405 | * @c: upper bound | |
1406 | * | |
1407 | * This function designates that b is between a and c or not (for example, | |
1408 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 | |
1409 | * otherwise. | |
1410 | */ | |
1411 | u8 llc_circular_between(u8 a, u8 b, u8 c) | |
1412 | { | |
1413 | b = b - a; | |
1414 | c = c - a; | |
1415 | return b <= c; | |
1416 | } | |
1417 | ||
1418 | /** | |
1419 | * llc_process_tmr_ev - timer backend | |
1420 | * @sk: active connection | |
1421 | * @skb: occurred event | |
1422 | * | |
1423 | * This function is called from timer callback functions. When connection | |
1424 | * is busy (during sending a data frame) timer expiration event must be | |
1425 | * queued. Otherwise this event can be sent to connection state machine. | |
1426 | * Queued events will process by llc_backlog_rcv function after sending | |
1427 | * data frame. | |
1428 | */ | |
1429 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) | |
1430 | { | |
1431 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { | |
1432 | printk(KERN_WARNING "%s: timer called on closed connection\n", | |
0dc47877 | 1433 | __func__); |
1da177e4 LT |
1434 | kfree_skb(skb); |
1435 | } else { | |
1436 | if (!sock_owned_by_user(sk)) | |
1437 | llc_conn_state_process(sk, skb); | |
1438 | else { | |
1439 | llc_set_backlog_type(skb, LLC_EVENT); | |
1440 | sk_add_backlog(sk, skb); | |
1441 | } | |
1442 | } | |
1443 | } |