Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * llc_c_ac.c - actions performed during connection state transition. | |
3 | * | |
4 | * Description: | |
5 | * Functions in this module are implementation of connection component actions | |
6 | * Details of actions can be found in IEEE-802.2 standard document. | |
7 | * All functions have one connection and one event as input argument. All of | |
8 | * them return 0 On success and 1 otherwise. | |
9 | * | |
10 | * Copyright (c) 1997 by Procom Technology, Inc. | |
11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
12 | * | |
13 | * This program can be redistributed or modified under the terms of the | |
14 | * GNU General Public License as published by the Free Software Foundation. | |
15 | * This program is distributed without any warranty or implied warranty | |
16 | * of merchantability or fitness for a particular purpose. | |
17 | * | |
18 | * See the GNU General Public License for more details. | |
19 | */ | |
20 | #include <linux/netdevice.h> | |
21 | #include <net/llc_conn.h> | |
22 | #include <net/llc_sap.h> | |
23 | #include <net/sock.h> | |
24 | #include <net/llc_c_ev.h> | |
25 | #include <net/llc_c_ac.h> | |
26 | #include <net/llc_c_st.h> | |
27 | #include <net/llc_pdu.h> | |
28 | #include <net/llc.h> | |
29 | ||
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); |
d389424e | 201 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
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); |
d389424e | 226 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
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); |
d389424e | 252 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
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; | |
d389424e | 285 | nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
286 | if (nskb) { |
287 | struct llc_sap *sap = llc->sap; | |
288 | ||
1da177e4 LT |
289 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
290 | llc->daddr.lsap, LLC_PDU_RSP); | |
291 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
292 | llc->vR, INCORRECT); | |
293 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 294 | if (unlikely(rc)) |
1da177e4 LT |
295 | goto free; |
296 | llc_conn_send_pdu(sk, nskb); | |
297 | } | |
298 | out: | |
299 | return rc; | |
300 | free: | |
301 | kfree_skb(nskb); | |
302 | goto out; | |
303 | } | |
304 | ||
305 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) | |
306 | { | |
307 | int rc = -ENOBUFS; | |
1d67e650 | 308 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 309 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
310 | |
311 | if (nskb) { | |
1da177e4 LT |
312 | struct llc_sap *sap = llc->sap; |
313 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
314 | ||
1da177e4 LT |
315 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
316 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 317 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
1da177e4 LT |
318 | llc->vR, INCORRECT); |
319 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 320 | if (unlikely(rc)) |
1da177e4 LT |
321 | goto free; |
322 | llc_conn_send_pdu(sk, nskb); | |
323 | } | |
324 | out: | |
325 | return rc; | |
326 | free: | |
327 | kfree_skb(nskb); | |
328 | goto out; | |
329 | } | |
330 | ||
331 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
332 | { | |
333 | u8 f_bit; | |
334 | int rc = -ENOBUFS; | |
335 | struct sk_buff *nskb; | |
1d67e650 | 336 | struct llc_sock *llc = llc_sk(sk); |
1da177e4 LT |
337 | |
338 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
d389424e | 339 | nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 | 340 | if (nskb) { |
1da177e4 LT |
341 | struct llc_sap *sap = llc->sap; |
342 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
343 | ||
1da177e4 LT |
344 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
345 | llc->daddr.lsap, LLC_PDU_RSP); | |
346 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
347 | llc->vR, INCORRECT); | |
348 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 349 | if (unlikely(rc)) |
1da177e4 LT |
350 | goto free; |
351 | llc_conn_send_pdu(sk, nskb); | |
352 | } | |
353 | out: | |
354 | return rc; | |
355 | free: | |
356 | kfree_skb(nskb); | |
357 | goto out; | |
358 | } | |
359 | ||
360 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
361 | { | |
362 | int rc; | |
363 | struct llc_sock *llc = llc_sk(sk); | |
364 | struct llc_sap *sap = llc->sap; | |
365 | ||
366 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
367 | llc->daddr.lsap, LLC_PDU_CMD); | |
368 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
369 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 370 | if (likely(!rc)) { |
1da177e4 LT |
371 | llc_conn_send_pdu(sk, skb); |
372 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
373 | } | |
374 | return rc; | |
375 | } | |
376 | ||
377 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
378 | { | |
379 | int rc; | |
380 | struct llc_sock *llc = llc_sk(sk); | |
381 | struct llc_sap *sap = llc->sap; | |
382 | ||
383 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
384 | llc->daddr.lsap, LLC_PDU_CMD); | |
385 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
386 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 387 | if (likely(!rc)) { |
1da177e4 LT |
388 | llc_conn_send_pdu(sk, skb); |
389 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
390 | } | |
391 | return rc; | |
392 | } | |
393 | ||
394 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
395 | { | |
396 | int rc; | |
397 | struct llc_sock *llc = llc_sk(sk); | |
398 | struct llc_sap *sap = llc->sap; | |
399 | ||
400 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
401 | llc->daddr.lsap, LLC_PDU_CMD); | |
402 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
403 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 404 | if (likely(!rc)) { |
1da177e4 LT |
405 | llc_conn_send_pdu(sk, skb); |
406 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
407 | } | |
408 | return 0; | |
409 | } | |
410 | ||
411 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
412 | { | |
413 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
414 | u8 nr = LLC_I_GET_NR(pdu); | |
415 | ||
416 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
421 | struct sk_buff *skb) | |
422 | { | |
423 | u8 nr; | |
424 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
425 | int rc = -ENOBUFS; | |
1d67e650 | 426 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 427 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
428 | |
429 | if (nskb) { | |
1da177e4 LT |
430 | struct llc_sap *sap = llc->sap; |
431 | ||
1da177e4 LT |
432 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
433 | llc->daddr.lsap, LLC_PDU_RSP); | |
434 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
435 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 436 | if (likely(!rc)) |
1da177e4 LT |
437 | llc_conn_send_pdu(sk, nskb); |
438 | else | |
439 | kfree_skb(skb); | |
440 | } | |
441 | if (rc) { | |
442 | nr = LLC_I_GET_NR(pdu); | |
443 | rc = 0; | |
444 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
445 | } | |
446 | return rc; | |
447 | } | |
448 | ||
449 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
450 | { | |
451 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
452 | u8 nr = LLC_I_GET_NR(pdu); | |
453 | ||
454 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
455 | return 0; | |
456 | } | |
457 | ||
458 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
459 | { | |
460 | int rc = -ENOBUFS; | |
1d67e650 | 461 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 462 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
463 | |
464 | if (nskb) { | |
1da177e4 LT |
465 | struct llc_sap *sap = llc->sap; |
466 | ||
1da177e4 LT |
467 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
468 | llc->daddr.lsap, LLC_PDU_CMD); | |
469 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
470 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 471 | if (unlikely(rc)) |
1da177e4 LT |
472 | goto free; |
473 | llc_conn_send_pdu(sk, nskb); | |
474 | } | |
475 | out: | |
476 | return rc; | |
477 | free: | |
478 | kfree_skb(nskb); | |
479 | goto out; | |
480 | } | |
481 | ||
482 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
483 | { | |
484 | int rc = -ENOBUFS; | |
1d67e650 | 485 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 486 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
487 | |
488 | if (nskb) { | |
1da177e4 LT |
489 | struct llc_sap *sap = llc->sap; |
490 | ||
1da177e4 LT |
491 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
492 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 493 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
1da177e4 | 494 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 495 | if (unlikely(rc)) |
1da177e4 LT |
496 | goto free; |
497 | llc_conn_send_pdu(sk, nskb); | |
498 | } | |
499 | out: | |
500 | return rc; | |
501 | free: | |
502 | kfree_skb(nskb); | |
503 | goto out; | |
504 | } | |
505 | ||
506 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
507 | { | |
508 | int rc = -ENOBUFS; | |
1d67e650 | 509 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 510 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
511 | |
512 | if (nskb) { | |
1da177e4 | 513 | struct llc_sap *sap = llc->sap; |
1da177e4 | 514 | |
1da177e4 LT |
515 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
516 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 517 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
1da177e4 | 518 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 519 | if (unlikely(rc)) |
1da177e4 LT |
520 | goto free; |
521 | llc_conn_send_pdu(sk, nskb); | |
522 | } | |
523 | out: | |
524 | return rc; | |
525 | free: | |
526 | kfree_skb(nskb); | |
527 | goto out; | |
528 | } | |
529 | ||
530 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
531 | { | |
532 | int rc = -ENOBUFS; | |
1d67e650 | 533 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 534 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
535 | |
536 | if (nskb) { | |
1da177e4 LT |
537 | struct llc_sap *sap = llc->sap; |
538 | ||
1da177e4 LT |
539 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
540 | llc->daddr.lsap, LLC_PDU_CMD); | |
541 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
542 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 543 | if (unlikely(rc)) |
1da177e4 LT |
544 | goto free; |
545 | llc_conn_send_pdu(sk, nskb); | |
546 | } | |
547 | out: | |
548 | return rc; | |
549 | free: | |
550 | kfree_skb(nskb); | |
551 | goto out; | |
552 | } | |
553 | ||
554 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
555 | { | |
556 | int rc = -ENOBUFS; | |
1d67e650 | 557 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 558 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
559 | |
560 | if (nskb) { | |
1da177e4 | 561 | struct llc_sap *sap = llc->sap; |
1da177e4 | 562 | |
1da177e4 LT |
563 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
564 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 565 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
1da177e4 | 566 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 567 | if (unlikely(rc)) |
1da177e4 LT |
568 | goto free; |
569 | llc_conn_send_pdu(sk, nskb); | |
570 | } | |
571 | out: | |
572 | return rc; | |
573 | free: | |
574 | kfree_skb(nskb); | |
575 | goto out; | |
576 | } | |
577 | ||
578 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
579 | { | |
580 | int rc = -ENOBUFS; | |
1d67e650 | 581 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 582 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
583 | |
584 | if (nskb) { | |
1da177e4 LT |
585 | struct llc_sap *sap = llc->sap; |
586 | ||
1da177e4 LT |
587 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
588 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 589 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
1da177e4 | 590 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 591 | if (unlikely(rc)) |
1da177e4 LT |
592 | goto free; |
593 | llc_conn_send_pdu(sk, nskb); | |
594 | } | |
595 | out: | |
596 | return rc; | |
597 | free: | |
598 | kfree_skb(nskb); | |
599 | goto out; | |
600 | } | |
601 | ||
602 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
603 | { | |
604 | struct llc_sock *llc = llc_sk(sk); | |
605 | ||
606 | if (!llc->remote_busy_flag) { | |
607 | llc->remote_busy_flag = 1; | |
608 | mod_timer(&llc->busy_state_timer.timer, | |
590232a7 | 609 | jiffies + llc->busy_state_timer.expire); |
1da177e4 LT |
610 | } |
611 | return 0; | |
612 | } | |
613 | ||
614 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
615 | { | |
616 | int rc = -ENOBUFS; | |
1d67e650 | 617 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 618 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
619 | |
620 | if (nskb) { | |
1da177e4 LT |
621 | struct llc_sap *sap = llc->sap; |
622 | ||
1da177e4 LT |
623 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
624 | llc->daddr.lsap, LLC_PDU_RSP); | |
625 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
626 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 627 | if (unlikely(rc)) |
1da177e4 LT |
628 | goto free; |
629 | llc_conn_send_pdu(sk, nskb); | |
630 | } | |
631 | out: | |
632 | return rc; | |
633 | free: | |
634 | kfree_skb(nskb); | |
635 | goto out; | |
636 | } | |
637 | ||
638 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
639 | { | |
640 | int rc = -ENOBUFS; | |
1d67e650 | 641 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 642 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
643 | |
644 | if (nskb) { | |
1da177e4 LT |
645 | struct llc_sap *sap = llc->sap; |
646 | ||
1da177e4 LT |
647 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
648 | llc->daddr.lsap, LLC_PDU_CMD); | |
649 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
650 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 651 | if (unlikely(rc)) |
1da177e4 LT |
652 | goto free; |
653 | llc_conn_send_pdu(sk, nskb); | |
654 | } | |
655 | out: | |
656 | return rc; | |
657 | free: | |
658 | kfree_skb(nskb); | |
659 | goto out; | |
660 | } | |
661 | ||
662 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
663 | { | |
664 | int rc = -ENOBUFS; | |
1d67e650 | 665 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 666 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
667 | |
668 | if (nskb) { | |
1da177e4 LT |
669 | struct llc_sap *sap = llc->sap; |
670 | u8 f_bit = 1; | |
671 | ||
1da177e4 LT |
672 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
673 | llc->daddr.lsap, LLC_PDU_RSP); | |
674 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
675 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 676 | if (unlikely(rc)) |
1da177e4 LT |
677 | goto free; |
678 | llc_conn_send_pdu(sk, nskb); | |
679 | } | |
680 | out: | |
681 | return rc; | |
682 | free: | |
683 | kfree_skb(nskb); | |
684 | goto out; | |
685 | } | |
686 | ||
687 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
688 | { | |
689 | int rc = -ENOBUFS; | |
1d67e650 | 690 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 691 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
692 | |
693 | if (nskb) { | |
1da177e4 | 694 | struct llc_sap *sap = llc->sap; |
1da177e4 | 695 | |
1da177e4 LT |
696 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
697 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 698 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
1da177e4 | 699 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 700 | if (unlikely(rc)) |
1da177e4 LT |
701 | goto free; |
702 | llc_conn_send_pdu(sk, nskb); | |
703 | } | |
704 | out: | |
705 | return rc; | |
706 | free: | |
707 | kfree_skb(nskb); | |
708 | goto out; | |
709 | } | |
710 | ||
711 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
712 | { | |
713 | int rc = -ENOBUFS; | |
1d67e650 | 714 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 715 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
716 | |
717 | if (nskb) { | |
1da177e4 LT |
718 | struct llc_sap *sap = llc->sap; |
719 | ||
1da177e4 LT |
720 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
721 | llc->daddr.lsap, LLC_PDU_RSP); | |
722 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
723 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 724 | if (unlikely(rc)) |
1da177e4 LT |
725 | goto free; |
726 | llc_conn_send_pdu(sk, nskb); | |
727 | } | |
728 | out: | |
729 | return rc; | |
730 | free: | |
731 | kfree_skb(nskb); | |
732 | goto out; | |
733 | } | |
734 | ||
735 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
736 | { | |
737 | int rc = -ENOBUFS; | |
1d67e650 | 738 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 739 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
740 | |
741 | if (nskb) { | |
1da177e4 LT |
742 | struct llc_sap *sap = llc->sap; |
743 | ||
1da177e4 LT |
744 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
745 | llc->daddr.lsap, LLC_PDU_RSP); | |
746 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
747 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 748 | if (unlikely(rc)) |
1da177e4 LT |
749 | goto free; |
750 | llc_conn_send_pdu(sk, nskb); | |
751 | } | |
752 | out: | |
753 | return rc; | |
754 | free: | |
755 | kfree_skb(nskb); | |
756 | goto out; | |
757 | } | |
758 | ||
759 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
760 | { | |
761 | int state_changed = llc_sk(sk)->p_flag && !value; | |
762 | ||
763 | llc_sk(sk)->p_flag = value; | |
764 | ||
765 | if (state_changed) | |
766 | sk->sk_state_change(sk); | |
767 | } | |
768 | ||
769 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
770 | { | |
771 | int rc = -ENOBUFS; | |
1da177e4 | 772 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 773 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
774 | |
775 | if (nskb) { | |
776 | struct llc_sap *sap = llc->sap; | |
777 | u8 *dmac = llc->daddr.mac; | |
778 | ||
779 | if (llc->dev->flags & IFF_LOOPBACK) | |
780 | dmac = llc->dev->dev_addr; | |
1da177e4 LT |
781 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
782 | llc->daddr.lsap, LLC_PDU_CMD); | |
783 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
784 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
249ff1c6 | 785 | if (unlikely(rc)) |
1da177e4 LT |
786 | goto free; |
787 | llc_conn_send_pdu(sk, nskb); | |
788 | llc_conn_set_p_flag(sk, 1); | |
789 | } | |
790 | out: | |
791 | return rc; | |
792 | free: | |
793 | kfree_skb(nskb); | |
794 | goto out; | |
795 | } | |
796 | ||
797 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
798 | { | |
799 | u8 f_bit; | |
800 | int rc = -ENOBUFS; | |
1d67e650 | 801 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 802 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
803 | |
804 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
805 | if (nskb) { | |
1da177e4 LT |
806 | struct llc_sap *sap = llc->sap; |
807 | ||
808 | nskb->dev = llc->dev; | |
809 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
810 | llc->daddr.lsap, LLC_PDU_RSP); | |
811 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
812 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 813 | if (unlikely(rc)) |
1da177e4 LT |
814 | goto free; |
815 | llc_conn_send_pdu(sk, nskb); | |
816 | } | |
817 | out: | |
818 | return rc; | |
819 | free: | |
820 | kfree_skb(nskb); | |
821 | goto out; | |
822 | } | |
823 | ||
824 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
825 | { | |
826 | llc_sk(sk)->s_flag = 0; | |
827 | return 0; | |
828 | } | |
829 | ||
830 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
831 | { | |
832 | llc_sk(sk)->s_flag = 1; | |
833 | return 0; | |
834 | } | |
835 | ||
836 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
837 | { | |
838 | struct llc_sock *llc = llc_sk(sk); | |
839 | ||
840 | llc_conn_set_p_flag(sk, 1); | |
841 | mod_timer(&llc->pf_cycle_timer.timer, | |
590232a7 | 842 | jiffies + llc->pf_cycle_timer.expire); |
1da177e4 LT |
843 | return 0; |
844 | } | |
845 | ||
846 | /** | |
847 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
848 | * @sk: current connection structure | |
849 | * @skb: current event | |
850 | * | |
851 | * Checks number of received PDUs which have not been acknowledged, yet, | |
852 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
853 | * sends an RR response as acknowledgement for them. Returns 0 for | |
854 | * success, 1 otherwise. | |
855 | */ | |
856 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
857 | { | |
858 | u8 pf_bit; | |
859 | struct llc_sock *llc = llc_sk(sk); | |
860 | ||
861 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
862 | llc->ack_pf |= pf_bit & 1; | |
863 | if (!llc->ack_must_be_send) { | |
864 | llc->first_pdu_Ns = llc->vR; | |
865 | llc->ack_must_be_send = 1; | |
866 | llc->ack_pf = pf_bit & 1; | |
867 | } | |
59c6196e JF |
868 | if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO) |
869 | % LLC_2_SEQ_NBR_MODULO) >= llc->npta) { | |
1da177e4 LT |
870 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); |
871 | llc->ack_must_be_send = 0; | |
872 | llc->ack_pf = 0; | |
873 | llc_conn_ac_inc_npta_value(sk, skb); | |
874 | } | |
875 | return 0; | |
876 | } | |
877 | ||
878 | /** | |
879 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag | |
880 | * @sk: current connection structure | |
881 | * @skb: current event | |
882 | * | |
883 | * This action resets ack_must_be_send flag of given connection, this flag | |
884 | * indicates if there is any PDU which has not been acknowledged yet. | |
885 | * Returns 0 for success, 1 otherwise. | |
886 | */ | |
887 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) | |
888 | { | |
889 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; | |
890 | return 0; | |
891 | } | |
892 | ||
893 | /** | |
894 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs | |
895 | * @sk: current connection structure | |
896 | * @skb: current event | |
897 | * | |
898 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to | |
899 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is | |
900 | * set to one if one PDU with p-bit set to one is received. Returns 0 for | |
901 | * success, 1 otherwise. | |
902 | */ | |
903 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, | |
904 | struct sk_buff *skb) | |
905 | { | |
906 | int rc; | |
907 | struct llc_sock *llc = llc_sk(sk); | |
908 | struct llc_sap *sap = llc->sap; | |
909 | ||
910 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
911 | llc->daddr.lsap, LLC_PDU_RSP); | |
912 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); | |
913 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 914 | if (likely(!rc)) { |
1da177e4 LT |
915 | llc_conn_send_pdu(sk, skb); |
916 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
917 | } | |
918 | return rc; | |
919 | } | |
920 | ||
921 | /** | |
922 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs | |
923 | * @sk: current connection structure. | |
924 | * @skb: current event. | |
925 | * | |
926 | * This action sends an I-format PDU as acknowledge to received PDUs which | |
927 | * have not been acknowledged, yet, if there is any. By using of this | |
928 | * action number of acknowledgements decreases, this technic is called | |
929 | * piggy backing. Returns 0 for success, 1 otherwise. | |
930 | */ | |
931 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) | |
932 | { | |
933 | struct llc_sock *llc = llc_sk(sk); | |
934 | ||
935 | if (llc->ack_must_be_send) { | |
936 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); | |
937 | llc->ack_must_be_send = 0 ; | |
938 | llc->ack_pf = 0; | |
939 | } else | |
940 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /** | |
945 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked | |
946 | * @sk: current connection structure. | |
947 | * @skb: current event. | |
948 | * | |
949 | * This action sends an RR response with f-bit set to ack_pf flag as | |
950 | * acknowledge to all received PDUs which have not been acknowledged, yet, | |
951 | * if there is any. ack_pf flag indicates if a PDU has been received with | |
952 | * p-bit set to one. Returns 0 for success, 1 otherwise. | |
953 | */ | |
954 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
955 | struct sk_buff *skb) | |
956 | { | |
957 | int rc = -ENOBUFS; | |
1d67e650 | 958 | struct llc_sock *llc = llc_sk(sk); |
d389424e | 959 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev); |
1da177e4 LT |
960 | |
961 | if (nskb) { | |
1da177e4 LT |
962 | struct llc_sap *sap = llc->sap; |
963 | ||
1da177e4 LT |
964 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
965 | llc->daddr.lsap, LLC_PDU_RSP); | |
966 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); | |
967 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 968 | if (unlikely(rc)) |
1da177e4 LT |
969 | goto free; |
970 | llc_conn_send_pdu(sk, nskb); | |
971 | } | |
972 | out: | |
973 | return rc; | |
974 | free: | |
975 | kfree_skb(nskb); | |
976 | goto out; | |
977 | } | |
978 | ||
979 | /** | |
980 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater | |
981 | * @sk: current connection structure. | |
982 | * @skb: current event. | |
983 | * | |
984 | * After "inc_cntr" times calling of this action, "npta" increase by one. | |
985 | * this action tries to make vale of "npta" greater as possible; number of | |
986 | * acknowledgements decreases by increasing of "npta". Returns 0 for | |
987 | * success, 1 otherwise. | |
988 | */ | |
989 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) | |
990 | { | |
991 | struct llc_sock *llc = llc_sk(sk); | |
992 | ||
993 | if (!llc->inc_cntr) { | |
994 | llc->dec_step = 0; | |
995 | llc->dec_cntr = llc->inc_cntr = 2; | |
996 | ++llc->npta; | |
38199824 DM |
997 | if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO) |
998 | llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; | |
1da177e4 LT |
999 | } else |
1000 | --llc->inc_cntr; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one | |
1006 | * @sk: current connection structure. | |
1007 | * @skb: current event. | |
1008 | * | |
1009 | * After receiving "dec_cntr" times RR command, this action decreases | |
1010 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1011 | */ | |
1012 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) | |
1013 | { | |
1014 | struct llc_sock *llc = llc_sk(sk); | |
1015 | ||
1016 | if (!llc->connect_step && !llc->remote_busy_flag) { | |
1017 | if (!llc->dec_step) { | |
1018 | if (!llc->dec_cntr) { | |
1019 | llc->inc_cntr = llc->dec_cntr = 2; | |
1020 | if (llc->npta > 0) | |
1021 | llc->npta = llc->npta - 1; | |
1022 | } else | |
1023 | llc->dec_cntr -=1; | |
1024 | } | |
1025 | } else | |
1026 | llc->connect_step = 0 ; | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one | |
1032 | * @sk: current connection structure. | |
1033 | * @skb: current event. | |
1034 | * | |
1035 | * After receiving "dec_cntr" times RNR command, this action decreases | |
1036 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1037 | */ | |
1038 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) | |
1039 | { | |
1040 | struct llc_sock *llc = llc_sk(sk); | |
1041 | ||
1042 | if (llc->remote_busy_flag) | |
1043 | if (!llc->dec_step) { | |
1044 | if (!llc->dec_cntr) { | |
1045 | llc->inc_cntr = llc->dec_cntr = 2; | |
1046 | if (llc->npta > 0) | |
1047 | --llc->npta; | |
1048 | } else | |
1049 | --llc->dec_cntr; | |
1050 | } | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * llc_conn_ac_dec_tx_win_size - decreases tx window size | |
1056 | * @sk: current connection structure. | |
1057 | * @skb: current event. | |
1058 | * | |
1059 | * After receiving of a REJ command or response, transmit window size is | |
1060 | * decreased by number of PDUs which are outstanding yet. Returns 0 for | |
1061 | * success, 1 otherwise. | |
1062 | */ | |
1063 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1064 | { | |
1065 | struct llc_sock *llc = llc_sk(sk); | |
1066 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); | |
1067 | ||
59c6196e JF |
1068 | if (llc->k - unacked_pdu < 1) |
1069 | llc->k = 1; | |
1070 | else | |
1071 | llc->k -= unacked_pdu; | |
1da177e4 LT |
1072 | return 0; |
1073 | } | |
1074 | ||
1075 | /** | |
1076 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1077 | * @sk: current connection structure. | |
1078 | * @skb: current event. | |
1079 | * | |
1080 | * After receiving an RR response with f-bit set to one, transmit window | |
1081 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1082 | */ | |
1083 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1084 | { | |
1085 | struct llc_sock *llc = llc_sk(sk); | |
1086 | ||
1087 | llc->k += 1; | |
38199824 DM |
1088 | if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1089 | llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; | |
1da177e4 LT |
1090 | return 0; |
1091 | } | |
1092 | ||
1093 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1094 | { | |
1095 | struct llc_sock *llc = llc_sk(sk); | |
1096 | ||
1097 | del_timer(&llc->pf_cycle_timer.timer); | |
1098 | del_timer(&llc->ack_timer.timer); | |
1099 | del_timer(&llc->rej_sent_timer.timer); | |
1100 | del_timer(&llc->busy_state_timer.timer); | |
1101 | llc->ack_must_be_send = 0; | |
1102 | llc->ack_pf = 0; | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1107 | { | |
1108 | struct llc_sock *llc = llc_sk(sk); | |
1109 | ||
1110 | del_timer(&llc->rej_sent_timer.timer); | |
1111 | del_timer(&llc->pf_cycle_timer.timer); | |
1112 | del_timer(&llc->busy_state_timer.timer); | |
1113 | llc->ack_must_be_send = 0; | |
1114 | llc->ack_pf = 0; | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1119 | { | |
1120 | struct llc_sock *llc = llc_sk(sk); | |
1121 | ||
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", | |
1430 | __FUNCTION__); | |
1431 | kfree_skb(skb); | |
1432 | } else { | |
1433 | if (!sock_owned_by_user(sk)) | |
1434 | llc_conn_state_process(sk, skb); | |
1435 | else { | |
1436 | llc_set_backlog_type(skb, LLC_EVENT); | |
1437 | sk_add_backlog(sk, skb); | |
1438 | } | |
1439 | } | |
1440 | } |