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> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
22 | #include <net/llc_conn.h> |
23 | #include <net/llc_sap.h> | |
24 | #include <net/sock.h> | |
25 | #include <net/llc_c_ev.h> | |
26 | #include <net/llc_c_ac.h> | |
27 | #include <net/llc_c_st.h> | |
28 | #include <net/llc_pdu.h> | |
29 | #include <net/llc.h> | |
30 | ||
1da177e4 LT |
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); |
f83f1768 | 202 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
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); |
f83f1768 | 227 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
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); |
f83f1768 | 253 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
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; | |
f83f1768 JP |
286 | nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
287 | sizeof(struct llc_frmr_info)); | |
1da177e4 LT |
288 | if (nskb) { |
289 | struct llc_sap *sap = llc->sap; | |
290 | ||
1da177e4 LT |
291 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
292 | llc->daddr.lsap, LLC_PDU_RSP); | |
293 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
294 | llc->vR, INCORRECT); | |
295 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 296 | if (unlikely(rc)) |
1da177e4 LT |
297 | goto free; |
298 | llc_conn_send_pdu(sk, nskb); | |
299 | } | |
300 | out: | |
301 | return rc; | |
302 | free: | |
303 | kfree_skb(nskb); | |
304 | goto out; | |
305 | } | |
306 | ||
307 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) | |
308 | { | |
309 | int rc = -ENOBUFS; | |
1d67e650 | 310 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 JP |
311 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
312 | sizeof(struct llc_frmr_info)); | |
1da177e4 LT |
313 | |
314 | if (nskb) { | |
1da177e4 LT |
315 | struct llc_sap *sap = llc->sap; |
316 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
317 | ||
1da177e4 LT |
318 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
319 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 320 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
1da177e4 LT |
321 | llc->vR, INCORRECT); |
322 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 323 | if (unlikely(rc)) |
1da177e4 LT |
324 | goto free; |
325 | llc_conn_send_pdu(sk, nskb); | |
326 | } | |
327 | out: | |
328 | return rc; | |
329 | free: | |
330 | kfree_skb(nskb); | |
331 | goto out; | |
332 | } | |
333 | ||
334 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
335 | { | |
336 | u8 f_bit; | |
337 | int rc = -ENOBUFS; | |
338 | struct sk_buff *nskb; | |
1d67e650 | 339 | struct llc_sock *llc = llc_sk(sk); |
1da177e4 LT |
340 | |
341 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
f83f1768 JP |
342 | nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
343 | sizeof(struct llc_frmr_info)); | |
1da177e4 | 344 | if (nskb) { |
1da177e4 LT |
345 | struct llc_sap *sap = llc->sap; |
346 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
347 | ||
1da177e4 LT |
348 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
349 | llc->daddr.lsap, LLC_PDU_RSP); | |
350 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
351 | llc->vR, INCORRECT); | |
352 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 353 | if (unlikely(rc)) |
1da177e4 LT |
354 | goto free; |
355 | llc_conn_send_pdu(sk, nskb); | |
356 | } | |
357 | out: | |
358 | return rc; | |
359 | free: | |
360 | kfree_skb(nskb); | |
361 | goto out; | |
362 | } | |
363 | ||
364 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
365 | { | |
366 | int rc; | |
367 | struct llc_sock *llc = llc_sk(sk); | |
368 | struct llc_sap *sap = llc->sap; | |
369 | ||
370 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
371 | llc->daddr.lsap, LLC_PDU_CMD); | |
372 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
373 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 374 | if (likely(!rc)) { |
1da177e4 LT |
375 | llc_conn_send_pdu(sk, skb); |
376 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
377 | } | |
378 | return rc; | |
379 | } | |
380 | ||
381 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
382 | { | |
383 | int rc; | |
384 | struct llc_sock *llc = llc_sk(sk); | |
385 | struct llc_sap *sap = llc->sap; | |
386 | ||
387 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
388 | llc->daddr.lsap, LLC_PDU_CMD); | |
389 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
390 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 391 | if (likely(!rc)) { |
5b5f4fd9 | 392 | rc = llc_conn_send_pdu(sk, skb); |
1da177e4 LT |
393 | llc_conn_ac_inc_vs_by_1(sk, skb); |
394 | } | |
395 | return rc; | |
396 | } | |
397 | ||
398 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
399 | { | |
400 | int rc; | |
401 | struct llc_sock *llc = llc_sk(sk); | |
402 | struct llc_sap *sap = llc->sap; | |
403 | ||
404 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
405 | llc->daddr.lsap, LLC_PDU_CMD); | |
406 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
407 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 408 | if (likely(!rc)) { |
1da177e4 LT |
409 | llc_conn_send_pdu(sk, skb); |
410 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
411 | } | |
412 | return 0; | |
413 | } | |
414 | ||
415 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
416 | { | |
417 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
418 | u8 nr = LLC_I_GET_NR(pdu); | |
419 | ||
420 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
425 | struct sk_buff *skb) | |
426 | { | |
427 | u8 nr; | |
428 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
429 | int rc = -ENOBUFS; | |
1d67e650 | 430 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 431 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
432 | |
433 | if (nskb) { | |
1da177e4 LT |
434 | struct llc_sap *sap = llc->sap; |
435 | ||
1da177e4 LT |
436 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
437 | llc->daddr.lsap, LLC_PDU_RSP); | |
438 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
439 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 440 | if (likely(!rc)) |
1da177e4 LT |
441 | llc_conn_send_pdu(sk, nskb); |
442 | else | |
443 | kfree_skb(skb); | |
444 | } | |
445 | if (rc) { | |
446 | nr = LLC_I_GET_NR(pdu); | |
447 | rc = 0; | |
448 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
449 | } | |
450 | return rc; | |
451 | } | |
452 | ||
453 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
454 | { | |
455 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
456 | u8 nr = LLC_I_GET_NR(pdu); | |
457 | ||
458 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
463 | { | |
464 | int rc = -ENOBUFS; | |
1d67e650 | 465 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 466 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
467 | |
468 | if (nskb) { | |
1da177e4 LT |
469 | struct llc_sap *sap = llc->sap; |
470 | ||
1da177e4 LT |
471 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
472 | llc->daddr.lsap, LLC_PDU_CMD); | |
473 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
474 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 475 | if (unlikely(rc)) |
1da177e4 LT |
476 | goto free; |
477 | llc_conn_send_pdu(sk, nskb); | |
478 | } | |
479 | out: | |
480 | return rc; | |
481 | free: | |
482 | kfree_skb(nskb); | |
483 | goto out; | |
484 | } | |
485 | ||
486 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
487 | { | |
488 | int rc = -ENOBUFS; | |
1d67e650 | 489 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 490 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
491 | |
492 | if (nskb) { | |
1da177e4 LT |
493 | struct llc_sap *sap = llc->sap; |
494 | ||
1da177e4 LT |
495 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
496 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 497 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
1da177e4 | 498 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 499 | if (unlikely(rc)) |
1da177e4 LT |
500 | goto free; |
501 | llc_conn_send_pdu(sk, nskb); | |
502 | } | |
503 | out: | |
504 | return rc; | |
505 | free: | |
506 | kfree_skb(nskb); | |
507 | goto out; | |
508 | } | |
509 | ||
510 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
511 | { | |
512 | int rc = -ENOBUFS; | |
1d67e650 | 513 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 514 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
515 | |
516 | if (nskb) { | |
1da177e4 | 517 | struct llc_sap *sap = llc->sap; |
1da177e4 | 518 | |
1da177e4 LT |
519 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
520 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 521 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
1da177e4 | 522 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 523 | if (unlikely(rc)) |
1da177e4 LT |
524 | goto free; |
525 | llc_conn_send_pdu(sk, nskb); | |
526 | } | |
527 | out: | |
528 | return rc; | |
529 | free: | |
530 | kfree_skb(nskb); | |
531 | goto out; | |
532 | } | |
533 | ||
534 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
535 | { | |
536 | int rc = -ENOBUFS; | |
1d67e650 | 537 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 538 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
539 | |
540 | if (nskb) { | |
1da177e4 LT |
541 | struct llc_sap *sap = llc->sap; |
542 | ||
1da177e4 LT |
543 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
544 | llc->daddr.lsap, LLC_PDU_CMD); | |
545 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
546 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 547 | if (unlikely(rc)) |
1da177e4 LT |
548 | goto free; |
549 | llc_conn_send_pdu(sk, nskb); | |
550 | } | |
551 | out: | |
552 | return rc; | |
553 | free: | |
554 | kfree_skb(nskb); | |
555 | goto out; | |
556 | } | |
557 | ||
558 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
559 | { | |
560 | int rc = -ENOBUFS; | |
1d67e650 | 561 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 562 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
563 | |
564 | if (nskb) { | |
1da177e4 | 565 | struct llc_sap *sap = llc->sap; |
1da177e4 | 566 | |
1da177e4 LT |
567 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
568 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 569 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
1da177e4 | 570 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 571 | if (unlikely(rc)) |
1da177e4 LT |
572 | goto free; |
573 | llc_conn_send_pdu(sk, nskb); | |
574 | } | |
575 | out: | |
576 | return rc; | |
577 | free: | |
578 | kfree_skb(nskb); | |
579 | goto out; | |
580 | } | |
581 | ||
582 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
583 | { | |
584 | int rc = -ENOBUFS; | |
1d67e650 | 585 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 586 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
587 | |
588 | if (nskb) { | |
1da177e4 LT |
589 | struct llc_sap *sap = llc->sap; |
590 | ||
1da177e4 LT |
591 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
592 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 593 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
1da177e4 | 594 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 595 | if (unlikely(rc)) |
1da177e4 LT |
596 | goto free; |
597 | llc_conn_send_pdu(sk, nskb); | |
598 | } | |
599 | out: | |
600 | return rc; | |
601 | free: | |
602 | kfree_skb(nskb); | |
603 | goto out; | |
604 | } | |
605 | ||
606 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
607 | { | |
608 | struct llc_sock *llc = llc_sk(sk); | |
609 | ||
610 | if (!llc->remote_busy_flag) { | |
611 | llc->remote_busy_flag = 1; | |
612 | mod_timer(&llc->busy_state_timer.timer, | |
590232a7 | 613 | jiffies + llc->busy_state_timer.expire); |
1da177e4 LT |
614 | } |
615 | return 0; | |
616 | } | |
617 | ||
618 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
619 | { | |
620 | int rc = -ENOBUFS; | |
1d67e650 | 621 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 622 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
623 | |
624 | if (nskb) { | |
1da177e4 LT |
625 | struct llc_sap *sap = llc->sap; |
626 | ||
1da177e4 LT |
627 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
628 | llc->daddr.lsap, LLC_PDU_RSP); | |
629 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
630 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 631 | if (unlikely(rc)) |
1da177e4 LT |
632 | goto free; |
633 | llc_conn_send_pdu(sk, nskb); | |
634 | } | |
635 | out: | |
636 | return rc; | |
637 | free: | |
638 | kfree_skb(nskb); | |
639 | goto out; | |
640 | } | |
641 | ||
642 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
643 | { | |
644 | int rc = -ENOBUFS; | |
1d67e650 | 645 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 646 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
647 | |
648 | if (nskb) { | |
1da177e4 LT |
649 | struct llc_sap *sap = llc->sap; |
650 | ||
1da177e4 LT |
651 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
652 | llc->daddr.lsap, LLC_PDU_CMD); | |
653 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
654 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 655 | if (unlikely(rc)) |
1da177e4 LT |
656 | goto free; |
657 | llc_conn_send_pdu(sk, nskb); | |
658 | } | |
659 | out: | |
660 | return rc; | |
661 | free: | |
662 | kfree_skb(nskb); | |
663 | goto out; | |
664 | } | |
665 | ||
666 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
667 | { | |
668 | int rc = -ENOBUFS; | |
1d67e650 | 669 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 670 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
671 | |
672 | if (nskb) { | |
1da177e4 LT |
673 | struct llc_sap *sap = llc->sap; |
674 | u8 f_bit = 1; | |
675 | ||
1da177e4 LT |
676 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
677 | llc->daddr.lsap, LLC_PDU_RSP); | |
678 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
679 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 680 | if (unlikely(rc)) |
1da177e4 LT |
681 | goto free; |
682 | llc_conn_send_pdu(sk, nskb); | |
683 | } | |
684 | out: | |
685 | return rc; | |
686 | free: | |
687 | kfree_skb(nskb); | |
688 | goto out; | |
689 | } | |
690 | ||
691 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
692 | { | |
693 | int rc = -ENOBUFS; | |
1d67e650 | 694 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 695 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
696 | |
697 | if (nskb) { | |
1da177e4 | 698 | struct llc_sap *sap = llc->sap; |
1da177e4 | 699 | |
1da177e4 LT |
700 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
701 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 702 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
1da177e4 | 703 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 704 | if (unlikely(rc)) |
1da177e4 LT |
705 | goto free; |
706 | llc_conn_send_pdu(sk, nskb); | |
707 | } | |
708 | out: | |
709 | return rc; | |
710 | free: | |
711 | kfree_skb(nskb); | |
712 | goto out; | |
713 | } | |
714 | ||
715 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
716 | { | |
717 | int rc = -ENOBUFS; | |
1d67e650 | 718 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 719 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
720 | |
721 | if (nskb) { | |
1da177e4 LT |
722 | struct llc_sap *sap = llc->sap; |
723 | ||
1da177e4 LT |
724 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
725 | llc->daddr.lsap, LLC_PDU_RSP); | |
726 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
727 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 728 | if (unlikely(rc)) |
1da177e4 LT |
729 | goto free; |
730 | llc_conn_send_pdu(sk, nskb); | |
731 | } | |
732 | out: | |
733 | return rc; | |
734 | free: | |
735 | kfree_skb(nskb); | |
736 | goto out; | |
737 | } | |
738 | ||
739 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
740 | { | |
741 | int rc = -ENOBUFS; | |
1d67e650 | 742 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 743 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
744 | |
745 | if (nskb) { | |
1da177e4 LT |
746 | struct llc_sap *sap = llc->sap; |
747 | ||
1da177e4 LT |
748 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
749 | llc->daddr.lsap, LLC_PDU_RSP); | |
750 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
751 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 752 | if (unlikely(rc)) |
1da177e4 LT |
753 | goto free; |
754 | llc_conn_send_pdu(sk, nskb); | |
755 | } | |
756 | out: | |
757 | return rc; | |
758 | free: | |
759 | kfree_skb(nskb); | |
760 | goto out; | |
761 | } | |
762 | ||
763 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
764 | { | |
765 | int state_changed = llc_sk(sk)->p_flag && !value; | |
766 | ||
767 | llc_sk(sk)->p_flag = value; | |
768 | ||
769 | if (state_changed) | |
770 | sk->sk_state_change(sk); | |
771 | } | |
772 | ||
773 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
774 | { | |
775 | int rc = -ENOBUFS; | |
1da177e4 | 776 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 777 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
778 | |
779 | if (nskb) { | |
780 | struct llc_sap *sap = llc->sap; | |
781 | u8 *dmac = llc->daddr.mac; | |
782 | ||
783 | if (llc->dev->flags & IFF_LOOPBACK) | |
784 | dmac = llc->dev->dev_addr; | |
1da177e4 LT |
785 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
786 | llc->daddr.lsap, LLC_PDU_CMD); | |
787 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
788 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
249ff1c6 | 789 | if (unlikely(rc)) |
1da177e4 LT |
790 | goto free; |
791 | llc_conn_send_pdu(sk, nskb); | |
792 | llc_conn_set_p_flag(sk, 1); | |
793 | } | |
794 | out: | |
795 | return rc; | |
796 | free: | |
797 | kfree_skb(nskb); | |
798 | goto out; | |
799 | } | |
800 | ||
801 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
802 | { | |
803 | u8 f_bit; | |
804 | int rc = -ENOBUFS; | |
1d67e650 | 805 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 806 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
1da177e4 LT |
807 | |
808 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
809 | if (nskb) { | |
1da177e4 LT |
810 | struct llc_sap *sap = llc->sap; |
811 | ||
812 | nskb->dev = llc->dev; | |
813 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
814 | llc->daddr.lsap, LLC_PDU_RSP); | |
815 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
816 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 817 | if (unlikely(rc)) |
1da177e4 LT |
818 | goto free; |
819 | llc_conn_send_pdu(sk, nskb); | |
820 | } | |
821 | out: | |
822 | return rc; | |
823 | free: | |
824 | kfree_skb(nskb); | |
825 | goto out; | |
826 | } | |
827 | ||
828 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
829 | { | |
830 | llc_sk(sk)->s_flag = 0; | |
831 | return 0; | |
832 | } | |
833 | ||
834 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
835 | { | |
836 | llc_sk(sk)->s_flag = 1; | |
837 | return 0; | |
838 | } | |
839 | ||
840 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
841 | { | |
842 | struct llc_sock *llc = llc_sk(sk); | |
843 | ||
844 | llc_conn_set_p_flag(sk, 1); | |
845 | mod_timer(&llc->pf_cycle_timer.timer, | |
590232a7 | 846 | jiffies + llc->pf_cycle_timer.expire); |
1da177e4 LT |
847 | return 0; |
848 | } | |
849 | ||
850 | /** | |
851 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
852 | * @sk: current connection structure | |
853 | * @skb: current event | |
854 | * | |
855 | * Checks number of received PDUs which have not been acknowledged, yet, | |
856 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
857 | * sends an RR response as acknowledgement for them. Returns 0 for | |
858 | * success, 1 otherwise. | |
859 | */ | |
860 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
861 | { | |
862 | u8 pf_bit; | |
863 | struct llc_sock *llc = llc_sk(sk); | |
864 | ||
865 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
866 | llc->ack_pf |= pf_bit & 1; | |
867 | if (!llc->ack_must_be_send) { | |
868 | llc->first_pdu_Ns = llc->vR; | |
869 | llc->ack_must_be_send = 1; | |
870 | llc->ack_pf = pf_bit & 1; | |
871 | } | |
59c6196e JF |
872 | if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO) |
873 | % LLC_2_SEQ_NBR_MODULO) >= llc->npta) { | |
1da177e4 LT |
874 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); |
875 | llc->ack_must_be_send = 0; | |
876 | llc->ack_pf = 0; | |
877 | llc_conn_ac_inc_npta_value(sk, skb); | |
878 | } | |
879 | return 0; | |
880 | } | |
881 | ||
882 | /** | |
883 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag | |
884 | * @sk: current connection structure | |
885 | * @skb: current event | |
886 | * | |
887 | * This action resets ack_must_be_send flag of given connection, this flag | |
888 | * indicates if there is any PDU which has not been acknowledged yet. | |
889 | * Returns 0 for success, 1 otherwise. | |
890 | */ | |
891 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) | |
892 | { | |
893 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; | |
894 | return 0; | |
895 | } | |
896 | ||
897 | /** | |
898 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs | |
899 | * @sk: current connection structure | |
900 | * @skb: current event | |
901 | * | |
902 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to | |
903 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is | |
904 | * set to one if one PDU with p-bit set to one is received. Returns 0 for | |
905 | * success, 1 otherwise. | |
906 | */ | |
907 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, | |
908 | struct sk_buff *skb) | |
909 | { | |
910 | int rc; | |
911 | struct llc_sock *llc = llc_sk(sk); | |
912 | struct llc_sap *sap = llc->sap; | |
913 | ||
914 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
915 | llc->daddr.lsap, LLC_PDU_RSP); | |
916 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); | |
917 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 918 | if (likely(!rc)) { |
5b5f4fd9 | 919 | rc = llc_conn_send_pdu(sk, skb); |
1da177e4 LT |
920 | llc_conn_ac_inc_vs_by_1(sk, skb); |
921 | } | |
922 | return rc; | |
923 | } | |
924 | ||
925 | /** | |
926 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs | |
927 | * @sk: current connection structure. | |
928 | * @skb: current event. | |
929 | * | |
930 | * This action sends an I-format PDU as acknowledge to received PDUs which | |
931 | * have not been acknowledged, yet, if there is any. By using of this | |
932 | * action number of acknowledgements decreases, this technic is called | |
933 | * piggy backing. Returns 0 for success, 1 otherwise. | |
934 | */ | |
935 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) | |
936 | { | |
937 | struct llc_sock *llc = llc_sk(sk); | |
5b5f4fd9 | 938 | int ret; |
1da177e4 LT |
939 | |
940 | if (llc->ack_must_be_send) { | |
5b5f4fd9 | 941 | ret = llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); |
1da177e4 LT |
942 | llc->ack_must_be_send = 0 ; |
943 | llc->ack_pf = 0; | |
5b5f4fd9 CW |
944 | } else { |
945 | ret = llc_conn_ac_send_i_cmd_p_set_0(sk, skb); | |
946 | } | |
947 | ||
948 | return ret; | |
1da177e4 LT |
949 | } |
950 | ||
951 | /** | |
952 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked | |
953 | * @sk: current connection structure. | |
954 | * @skb: current event. | |
955 | * | |
956 | * This action sends an RR response with f-bit set to ack_pf flag as | |
957 | * acknowledge to all received PDUs which have not been acknowledged, yet, | |
958 | * if there is any. ack_pf flag indicates if a PDU has been received with | |
959 | * p-bit set to one. Returns 0 for success, 1 otherwise. | |
960 | */ | |
961 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
962 | struct sk_buff *skb) | |
963 | { | |
964 | int rc = -ENOBUFS; | |
1d67e650 | 965 | struct llc_sock *llc = llc_sk(sk); |
f83f1768 | 966 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
1da177e4 LT |
967 | |
968 | if (nskb) { | |
1da177e4 LT |
969 | struct llc_sap *sap = llc->sap; |
970 | ||
1da177e4 LT |
971 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
972 | llc->daddr.lsap, LLC_PDU_RSP); | |
973 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); | |
974 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 975 | if (unlikely(rc)) |
1da177e4 LT |
976 | goto free; |
977 | llc_conn_send_pdu(sk, nskb); | |
978 | } | |
979 | out: | |
980 | return rc; | |
981 | free: | |
982 | kfree_skb(nskb); | |
983 | goto out; | |
984 | } | |
985 | ||
986 | /** | |
987 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater | |
988 | * @sk: current connection structure. | |
989 | * @skb: current event. | |
990 | * | |
991 | * After "inc_cntr" times calling of this action, "npta" increase by one. | |
992 | * this action tries to make vale of "npta" greater as possible; number of | |
993 | * acknowledgements decreases by increasing of "npta". Returns 0 for | |
994 | * success, 1 otherwise. | |
995 | */ | |
996 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) | |
997 | { | |
998 | struct llc_sock *llc = llc_sk(sk); | |
999 | ||
1000 | if (!llc->inc_cntr) { | |
1001 | llc->dec_step = 0; | |
1002 | llc->dec_cntr = llc->inc_cntr = 2; | |
1003 | ++llc->npta; | |
38199824 DM |
1004 | if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1005 | llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; | |
1da177e4 LT |
1006 | } else |
1007 | --llc->inc_cntr; | |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one | |
1013 | * @sk: current connection structure. | |
1014 | * @skb: current event. | |
1015 | * | |
1016 | * After receiving "dec_cntr" times RR command, this action decreases | |
1017 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1018 | */ | |
1019 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) | |
1020 | { | |
1021 | struct llc_sock *llc = llc_sk(sk); | |
1022 | ||
1023 | if (!llc->connect_step && !llc->remote_busy_flag) { | |
1024 | if (!llc->dec_step) { | |
1025 | if (!llc->dec_cntr) { | |
1026 | llc->inc_cntr = llc->dec_cntr = 2; | |
1027 | if (llc->npta > 0) | |
1028 | llc->npta = llc->npta - 1; | |
1029 | } else | |
1030 | llc->dec_cntr -=1; | |
1031 | } | |
1032 | } else | |
1033 | llc->connect_step = 0 ; | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | /** | |
1038 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one | |
1039 | * @sk: current connection structure. | |
1040 | * @skb: current event. | |
1041 | * | |
1042 | * After receiving "dec_cntr" times RNR command, this action decreases | |
1043 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1044 | */ | |
1045 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) | |
1046 | { | |
1047 | struct llc_sock *llc = llc_sk(sk); | |
1048 | ||
1049 | if (llc->remote_busy_flag) | |
1050 | if (!llc->dec_step) { | |
1051 | if (!llc->dec_cntr) { | |
1052 | llc->inc_cntr = llc->dec_cntr = 2; | |
1053 | if (llc->npta > 0) | |
1054 | --llc->npta; | |
1055 | } else | |
1056 | --llc->dec_cntr; | |
1057 | } | |
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * llc_conn_ac_dec_tx_win_size - decreases tx window size | |
1063 | * @sk: current connection structure. | |
1064 | * @skb: current event. | |
1065 | * | |
1066 | * After receiving of a REJ command or response, transmit window size is | |
1067 | * decreased by number of PDUs which are outstanding yet. Returns 0 for | |
1068 | * success, 1 otherwise. | |
1069 | */ | |
1070 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1071 | { | |
1072 | struct llc_sock *llc = llc_sk(sk); | |
1073 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); | |
1074 | ||
59c6196e JF |
1075 | if (llc->k - unacked_pdu < 1) |
1076 | llc->k = 1; | |
1077 | else | |
1078 | llc->k -= unacked_pdu; | |
1da177e4 LT |
1079 | return 0; |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1084 | * @sk: current connection structure. | |
1085 | * @skb: current event. | |
1086 | * | |
1087 | * After receiving an RR response with f-bit set to one, transmit window | |
1088 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1089 | */ | |
1090 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1091 | { | |
1092 | struct llc_sock *llc = llc_sk(sk); | |
1093 | ||
1094 | llc->k += 1; | |
38199824 DM |
1095 | if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1096 | llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; | |
1da177e4 LT |
1097 | return 0; |
1098 | } | |
1099 | ||
1100 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1101 | { | |
cb225e80 | 1102 | llc_sk_stop_all_timers(sk, false); |
1da177e4 LT |
1103 | return 0; |
1104 | } | |
1105 | ||
1106 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1107 | { | |
1108 | struct llc_sock *llc = llc_sk(sk); | |
1109 | ||
1110 | del_timer(&llc->rej_sent_timer.timer); | |
1111 | del_timer(&llc->pf_cycle_timer.timer); | |
1112 | del_timer(&llc->busy_state_timer.timer); | |
1113 | llc->ack_must_be_send = 0; | |
1114 | llc->ack_pf = 0; | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1119 | { | |
1120 | struct llc_sock *llc = llc_sk(sk); | |
1121 | ||
590232a7 | 1122 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1123 | return 0; |
1124 | } | |
1125 | ||
1126 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1127 | { | |
1128 | struct llc_sock *llc = llc_sk(sk); | |
1129 | ||
1130 | mod_timer(&llc->rej_sent_timer.timer, | |
590232a7 | 1131 | jiffies + llc->rej_sent_timer.expire); |
1da177e4 LT |
1132 | return 0; |
1133 | } | |
1134 | ||
1135 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, | |
1136 | struct sk_buff *skb) | |
1137 | { | |
1138 | struct llc_sock *llc = llc_sk(sk); | |
1139 | ||
1140 | if (!timer_pending(&llc->ack_timer.timer)) | |
1141 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1142 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1143 | return 0; |
1144 | } | |
1145 | ||
1146 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1147 | { | |
1148 | del_timer(&llc_sk(sk)->ack_timer.timer); | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) | |
1153 | { | |
1154 | struct llc_sock *llc = llc_sk(sk); | |
1155 | ||
1156 | del_timer(&llc->pf_cycle_timer.timer); | |
1157 | llc_conn_set_p_flag(sk, 0); | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1162 | { | |
1163 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) | |
1168 | { | |
1169 | int acked; | |
1170 | u16 unacked = 0; | |
1171 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1172 | struct llc_sock *llc = llc_sk(sk); | |
1173 | ||
1174 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); | |
1175 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); | |
1176 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ | |
1177 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { | |
1178 | llc->retry_count = 0; | |
1179 | del_timer(&llc->ack_timer.timer); | |
1180 | if (llc->failed_data_req) { | |
1181 | /* already, we did not accept data from upper layer | |
1182 | * (tx_window full or unacceptable state). Now, we | |
1183 | * can send data and must inform to upper layer. | |
1184 | */ | |
1185 | llc->failed_data_req = 0; | |
1186 | llc_conn_ac_data_confirm(sk, skb); | |
1187 | } | |
1188 | if (unacked) | |
1189 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1190 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1191 | } else if (llc->failed_data_req) { |
1192 | u8 f_bit; | |
1193 | ||
1194 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1195 | if (f_bit == 1) { | |
1196 | llc->failed_data_req = 0; | |
1197 | llc_conn_ac_data_confirm(sk, skb); | |
1198 | } | |
1199 | } | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) | |
1204 | { | |
1205 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1206 | ||
1207 | if (LLC_PDU_IS_RSP(pdu)) { | |
1208 | u8 f_bit; | |
1209 | ||
1210 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1211 | if (f_bit) { | |
1212 | llc_conn_set_p_flag(sk, 0); | |
1213 | llc_conn_ac_stop_p_timer(sk, skb); | |
1214 | } | |
1215 | } | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) | |
1220 | { | |
1221 | llc_sk(sk)->data_flag = 2; | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) | |
1226 | { | |
1227 | llc_sk(sk)->data_flag = 0; | |
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) | |
1232 | { | |
1233 | llc_sk(sk)->data_flag = 1; | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, | |
1238 | struct sk_buff *skb) | |
1239 | { | |
1240 | if (!llc_sk(sk)->data_flag) | |
1241 | llc_sk(sk)->data_flag = 1; | |
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) | |
1246 | { | |
1247 | llc_conn_set_p_flag(sk, 0); | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) | |
1252 | { | |
1253 | llc_conn_set_p_flag(sk, 1); | |
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) | |
1258 | { | |
1259 | llc_sk(sk)->remote_busy_flag = 0; | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) | |
1264 | { | |
1265 | llc_sk(sk)->cause_flag = 0; | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) | |
1270 | { | |
1271 | llc_sk(sk)->cause_flag = 1; | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) | |
1276 | { | |
1277 | llc_sk(sk)->retry_count = 0; | |
1278 | return 0; | |
1279 | } | |
1280 | ||
1281 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) | |
1282 | { | |
1283 | llc_sk(sk)->retry_count++; | |
1284 | return 0; | |
1285 | } | |
1286 | ||
1287 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) | |
1288 | { | |
1289 | llc_sk(sk)->vR = 0; | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) | |
1294 | { | |
1295 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) | |
1300 | { | |
1301 | llc_sk(sk)->vS = 0; | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) | |
1306 | { | |
1307 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; | |
1308 | return 0; | |
1309 | } | |
1310 | ||
2928c19e | 1311 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1312 | { |
59c6196e | 1313 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO; |
1da177e4 LT |
1314 | return 0; |
1315 | } | |
1316 | ||
e0dd5519 | 1317 | static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) |
1da177e4 LT |
1318 | { |
1319 | struct sock *sk = (struct sock *)timeout_data; | |
1320 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1321 | ||
1322 | bh_lock_sock(sk); | |
1323 | if (skb) { | |
1324 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1325 | ||
04e4223f | 1326 | skb_set_owner_r(skb, sk); |
e0dd5519 | 1327 | ev->type = type; |
1da177e4 LT |
1328 | llc_process_tmr_ev(sk, skb); |
1329 | } | |
1330 | bh_unlock_sock(sk); | |
1331 | } | |
1332 | ||
e0dd5519 | 1333 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) |
1da177e4 | 1334 | { |
e0dd5519 ACM |
1335 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); |
1336 | } | |
1da177e4 | 1337 | |
e0dd5519 ACM |
1338 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) |
1339 | { | |
1340 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); | |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) | |
1344 | { | |
e0dd5519 | 1345 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); |
1da177e4 LT |
1346 | } |
1347 | ||
1348 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) | |
1349 | { | |
e0dd5519 | 1350 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); |
1da177e4 LT |
1351 | } |
1352 | ||
1353 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) | |
1354 | { | |
1355 | llc_sk(sk)->X = llc_sk(sk)->vS; | |
1356 | llc_conn_ac_set_vs_nr(sk, skb); | |
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) | |
1361 | { | |
1362 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1363 | u8 nr = PDU_SUPV_GET_Nr(pdu); | |
1364 | ||
1365 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) | |
1366 | llc_conn_ac_set_vs_nr(sk, skb); | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Non-standard actions; these not contained in IEEE specification; for | |
1372 | * our own usage | |
1373 | */ | |
1374 | /** | |
1375 | * llc_conn_disc - removes connection from SAP list and frees it | |
1376 | * @sk: closed connection | |
1377 | * @skb: occurred event | |
1378 | */ | |
1379 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) | |
1380 | { | |
1381 | /* FIXME: this thing seems to want to die */ | |
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | /** | |
1386 | * llc_conn_reset - resets connection | |
1387 | * @sk : reseting connection. | |
1388 | * @skb: occurred event. | |
1389 | * | |
1390 | * Stop all timers, empty all queues and reset all flags. | |
1391 | */ | |
1392 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) | |
1393 | { | |
1394 | llc_sk_reset(sk); | |
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * llc_circular_between - designates that b is between a and c or not | |
1400 | * @a: lower bound | |
1401 | * @b: element to see if is between a and b | |
1402 | * @c: upper bound | |
1403 | * | |
1404 | * This function designates that b is between a and c or not (for example, | |
1405 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 | |
1406 | * otherwise. | |
1407 | */ | |
1408 | u8 llc_circular_between(u8 a, u8 b, u8 c) | |
1409 | { | |
1410 | b = b - a; | |
1411 | c = c - a; | |
1412 | return b <= c; | |
1413 | } | |
1414 | ||
1415 | /** | |
1416 | * llc_process_tmr_ev - timer backend | |
1417 | * @sk: active connection | |
1418 | * @skb: occurred event | |
1419 | * | |
1420 | * This function is called from timer callback functions. When connection | |
1421 | * is busy (during sending a data frame) timer expiration event must be | |
1422 | * queued. Otherwise this event can be sent to connection state machine. | |
1423 | * Queued events will process by llc_backlog_rcv function after sending | |
1424 | * data frame. | |
1425 | */ | |
1426 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) | |
1427 | { | |
1428 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { | |
1429 | printk(KERN_WARNING "%s: timer called on closed connection\n", | |
0dc47877 | 1430 | __func__); |
1da177e4 LT |
1431 | kfree_skb(skb); |
1432 | } else { | |
1433 | if (!sock_owned_by_user(sk)) | |
1434 | llc_conn_state_process(sk, skb); | |
1435 | else { | |
1436 | llc_set_backlog_type(skb, LLC_EVENT); | |
a3a858ff | 1437 | __sk_add_backlog(sk, skb); |
1da177e4 LT |
1438 | } |
1439 | } | |
1440 | } |