Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * llc_c_ac.c - actions performed during connection state transition. | |
3 | * | |
4 | * Description: | |
5 | * Functions in this module are implementation of connection component actions | |
6 | * Details of actions can be found in IEEE-802.2 standard document. | |
7 | * All functions have one connection and one event as input argument. All of | |
8 | * them return 0 On success and 1 otherwise. | |
9 | * | |
10 | * Copyright (c) 1997 by Procom Technology, Inc. | |
11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
12 | * | |
13 | * This program can be redistributed or modified under the terms of the | |
14 | * GNU General Public License as published by the Free Software Foundation. | |
15 | * This program is distributed without any warranty or implied warranty | |
16 | * of merchantability or fitness for a particular purpose. | |
17 | * | |
18 | * See the GNU General Public License for more details. | |
19 | */ | |
20 | #include <linux/netdevice.h> | |
21 | #include <net/llc_conn.h> | |
22 | #include <net/llc_sap.h> | |
23 | #include <net/sock.h> | |
24 | #include <net/llc_c_ev.h> | |
25 | #include <net/llc_c_ac.h> | |
26 | #include <net/llc_c_st.h> | |
27 | #include <net/llc_pdu.h> | |
28 | #include <net/llc.h> | |
29 | ||
30 | #include "llc_output.h" | |
31 | ||
32 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); | |
33 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); | |
34 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); | |
35 | ||
36 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); | |
37 | ||
38 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
39 | struct sk_buff *skb); | |
40 | ||
41 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); | |
42 | ||
43 | #define INCORRECT 0 | |
44 | ||
45 | int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) | |
46 | { | |
47 | struct llc_sock *llc = llc_sk(sk); | |
48 | ||
49 | if (llc->remote_busy_flag) { | |
50 | u8 nr; | |
51 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
52 | ||
53 | llc->remote_busy_flag = 0; | |
54 | del_timer(&llc->busy_state_timer.timer); | |
55 | nr = LLC_I_GET_NR(pdu); | |
56 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
57 | } | |
58 | return 0; | |
59 | } | |
60 | ||
61 | int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) | |
62 | { | |
63 | int rc = -ENOTCONN; | |
64 | u8 dsap; | |
65 | struct llc_sap *sap; | |
66 | ||
67 | llc_pdu_decode_dsap(skb, &dsap); | |
68 | sap = llc_sap_find(dsap); | |
69 | if (sap) { | |
70 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
71 | struct llc_sock *llc = llc_sk(sk); | |
72 | ||
73 | llc_pdu_decode_sa(skb, llc->daddr.mac); | |
74 | llc_pdu_decode_da(skb, llc->laddr.mac); | |
75 | llc->dev = skb->dev; | |
76 | ev->ind_prim = LLC_CONN_PRIM; | |
77 | rc = 0; | |
6e2144b7 | 78 | llc_sap_put(sap); |
1da177e4 LT |
79 | } |
80 | return rc; | |
81 | } | |
82 | ||
83 | int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) | |
84 | { | |
85 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
86 | ||
87 | ev->cfm_prim = LLC_CONN_PRIM; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) | |
92 | { | |
93 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
94 | ||
95 | ev->cfm_prim = LLC_DATA_PRIM; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) | |
100 | { | |
101 | llc_conn_rtn_pdu(sk, skb); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) | |
106 | { | |
107 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
108 | u8 reason = 0; | |
109 | int rc = 0; | |
110 | ||
111 | if (ev->type == LLC_CONN_EV_TYPE_PDU) { | |
112 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
113 | ||
114 | if (LLC_PDU_IS_RSP(pdu) && | |
115 | LLC_PDU_TYPE_IS_U(pdu) && | |
116 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) | |
117 | reason = LLC_DISC_REASON_RX_DM_RSP_PDU; | |
118 | else if (LLC_PDU_IS_CMD(pdu) && | |
119 | LLC_PDU_TYPE_IS_U(pdu) && | |
120 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) | |
121 | reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; | |
122 | } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) | |
123 | reason = LLC_DISC_REASON_ACK_TMR_EXP; | |
bdcc66cc | 124 | else |
1da177e4 | 125 | rc = -EINVAL; |
1da177e4 LT |
126 | if (!rc) { |
127 | ev->reason = reason; | |
128 | ev->ind_prim = LLC_DISC_PRIM; | |
129 | } | |
130 | return rc; | |
131 | } | |
132 | ||
133 | int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) | |
134 | { | |
135 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
136 | ||
137 | ev->reason = ev->status; | |
138 | ev->cfm_prim = LLC_DISC_PRIM; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) | |
143 | { | |
144 | u8 reason = 0; | |
145 | int rc = 1; | |
146 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
147 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
148 | struct llc_sock *llc = llc_sk(sk); | |
149 | ||
150 | switch (ev->type) { | |
151 | case LLC_CONN_EV_TYPE_PDU: | |
152 | if (LLC_PDU_IS_RSP(pdu) && | |
153 | LLC_PDU_TYPE_IS_U(pdu) && | |
154 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { | |
155 | reason = LLC_RESET_REASON_LOCAL; | |
156 | rc = 0; | |
157 | } else if (LLC_PDU_IS_CMD(pdu) && | |
158 | LLC_PDU_TYPE_IS_U(pdu) && | |
159 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { | |
160 | reason = LLC_RESET_REASON_REMOTE; | |
161 | rc = 0; | |
1da177e4 LT |
162 | } |
163 | break; | |
164 | case LLC_CONN_EV_TYPE_ACK_TMR: | |
165 | case LLC_CONN_EV_TYPE_P_TMR: | |
166 | case LLC_CONN_EV_TYPE_REJ_TMR: | |
167 | case LLC_CONN_EV_TYPE_BUSY_TMR: | |
168 | if (llc->retry_count > llc->n2) { | |
169 | reason = LLC_RESET_REASON_LOCAL; | |
170 | rc = 0; | |
bdcc66cc | 171 | } |
1da177e4 LT |
172 | break; |
173 | } | |
174 | if (!rc) { | |
175 | ev->reason = reason; | |
176 | ev->ind_prim = LLC_RESET_PRIM; | |
177 | } | |
178 | return rc; | |
179 | } | |
180 | ||
181 | int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) | |
182 | { | |
183 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
184 | ||
185 | ev->reason = 0; | |
186 | ev->cfm_prim = LLC_RESET_PRIM; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, | |
191 | struct sk_buff *skb) | |
192 | { | |
193 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
194 | ||
195 | if (LLC_PDU_IS_RSP(pdu) && | |
196 | LLC_PDU_TYPE_IS_I(pdu) && | |
197 | LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf) | |
198 | llc_conn_ac_clear_remote_busy(sk, skb); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, | |
203 | struct sk_buff *skb) | |
204 | { | |
205 | struct llc_sock *llc = llc_sk(sk); | |
206 | ||
207 | if (llc->data_flag == 2) | |
208 | del_timer(&llc->rej_sent_timer.timer); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
213 | { | |
214 | int rc = -ENOBUFS; | |
1d67e650 ACM |
215 | struct llc_sock *llc = llc_sk(sk); |
216 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
217 | |
218 | if (nskb) { | |
1da177e4 LT |
219 | struct llc_sap *sap = llc->sap; |
220 | ||
1da177e4 LT |
221 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
222 | llc->daddr.lsap, LLC_PDU_CMD); | |
223 | llc_pdu_init_as_disc_cmd(nskb, 1); | |
224 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 225 | if (unlikely(rc)) |
1da177e4 LT |
226 | goto free; |
227 | llc_conn_send_pdu(sk, nskb); | |
228 | llc_conn_ac_set_p_flag_1(sk, skb); | |
229 | } | |
230 | out: | |
231 | return rc; | |
232 | free: | |
233 | kfree_skb(nskb); | |
234 | goto out; | |
235 | } | |
236 | ||
237 | int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
238 | { | |
239 | int rc = -ENOBUFS; | |
1d67e650 ACM |
240 | struct llc_sock *llc = llc_sk(sk); |
241 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
242 | |
243 | if (nskb) { | |
1da177e4 LT |
244 | struct llc_sap *sap = llc->sap; |
245 | u8 f_bit; | |
246 | ||
1da177e4 LT |
247 | llc_pdu_decode_pf_bit(skb, &f_bit); |
248 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
249 | llc->daddr.lsap, LLC_PDU_RSP); | |
250 | llc_pdu_init_as_dm_rsp(nskb, f_bit); | |
251 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 252 | if (unlikely(rc)) |
1da177e4 LT |
253 | goto free; |
254 | llc_conn_send_pdu(sk, nskb); | |
255 | } | |
256 | out: | |
257 | return rc; | |
258 | free: | |
259 | kfree_skb(nskb); | |
260 | goto out; | |
261 | } | |
262 | ||
263 | int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
264 | { | |
265 | int rc = -ENOBUFS; | |
1d67e650 ACM |
266 | struct llc_sock *llc = llc_sk(sk); |
267 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
268 | |
269 | if (nskb) { | |
1da177e4 | 270 | struct llc_sap *sap = llc->sap; |
1da177e4 | 271 | |
1da177e4 LT |
272 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
273 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 274 | llc_pdu_init_as_dm_rsp(nskb, 1); |
1da177e4 | 275 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 276 | if (unlikely(rc)) |
1da177e4 LT |
277 | goto free; |
278 | llc_conn_send_pdu(sk, nskb); | |
279 | } | |
280 | out: | |
281 | return rc; | |
282 | free: | |
283 | kfree_skb(nskb); | |
284 | goto out; | |
285 | } | |
286 | ||
287 | int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) | |
288 | { | |
289 | u8 f_bit; | |
290 | int rc = -ENOBUFS; | |
291 | struct sk_buff *nskb; | |
292 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
293 | struct llc_sock *llc = llc_sk(sk); | |
294 | ||
295 | llc->rx_pdu_hdr = *((u32 *)pdu); | |
296 | if (LLC_PDU_IS_CMD(pdu)) | |
297 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
298 | else | |
299 | f_bit = 0; | |
1d67e650 | 300 | nskb = llc_alloc_frame(llc->dev); |
1da177e4 LT |
301 | if (nskb) { |
302 | struct llc_sap *sap = llc->sap; | |
303 | ||
1da177e4 LT |
304 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
305 | llc->daddr.lsap, LLC_PDU_RSP); | |
306 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
307 | llc->vR, INCORRECT); | |
308 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 309 | if (unlikely(rc)) |
1da177e4 LT |
310 | goto free; |
311 | llc_conn_send_pdu(sk, nskb); | |
312 | } | |
313 | out: | |
314 | return rc; | |
315 | free: | |
316 | kfree_skb(nskb); | |
317 | goto out; | |
318 | } | |
319 | ||
320 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) | |
321 | { | |
322 | int rc = -ENOBUFS; | |
1d67e650 ACM |
323 | struct llc_sock *llc = llc_sk(sk); |
324 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
325 | |
326 | if (nskb) { | |
1da177e4 LT |
327 | struct llc_sap *sap = llc->sap; |
328 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
329 | ||
1da177e4 LT |
330 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
331 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 332 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
1da177e4 LT |
333 | llc->vR, INCORRECT); |
334 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 335 | if (unlikely(rc)) |
1da177e4 LT |
336 | goto free; |
337 | llc_conn_send_pdu(sk, nskb); | |
338 | } | |
339 | out: | |
340 | return rc; | |
341 | free: | |
342 | kfree_skb(nskb); | |
343 | goto out; | |
344 | } | |
345 | ||
346 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
347 | { | |
348 | u8 f_bit; | |
349 | int rc = -ENOBUFS; | |
350 | struct sk_buff *nskb; | |
1d67e650 | 351 | struct llc_sock *llc = llc_sk(sk); |
1da177e4 LT |
352 | |
353 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1d67e650 | 354 | nskb = llc_alloc_frame(llc->dev); |
1da177e4 | 355 | if (nskb) { |
1da177e4 LT |
356 | struct llc_sap *sap = llc->sap; |
357 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
358 | ||
1da177e4 LT |
359 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
360 | llc->daddr.lsap, LLC_PDU_RSP); | |
361 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
362 | llc->vR, INCORRECT); | |
363 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 364 | if (unlikely(rc)) |
1da177e4 LT |
365 | goto free; |
366 | llc_conn_send_pdu(sk, nskb); | |
367 | } | |
368 | out: | |
369 | return rc; | |
370 | free: | |
371 | kfree_skb(nskb); | |
372 | goto out; | |
373 | } | |
374 | ||
375 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
376 | { | |
377 | int rc; | |
378 | struct llc_sock *llc = llc_sk(sk); | |
379 | struct llc_sap *sap = llc->sap; | |
380 | ||
381 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
382 | llc->daddr.lsap, LLC_PDU_CMD); | |
383 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
384 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 385 | if (likely(!rc)) { |
1da177e4 LT |
386 | llc_conn_send_pdu(sk, skb); |
387 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
388 | } | |
389 | return rc; | |
390 | } | |
391 | ||
392 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
393 | { | |
394 | int rc; | |
395 | struct llc_sock *llc = llc_sk(sk); | |
396 | struct llc_sap *sap = llc->sap; | |
397 | ||
398 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
399 | llc->daddr.lsap, LLC_PDU_CMD); | |
400 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
401 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 402 | if (likely(!rc)) { |
1da177e4 LT |
403 | llc_conn_send_pdu(sk, skb); |
404 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
405 | } | |
406 | return rc; | |
407 | } | |
408 | ||
409 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
410 | { | |
411 | int rc; | |
412 | struct llc_sock *llc = llc_sk(sk); | |
413 | struct llc_sap *sap = llc->sap; | |
414 | ||
415 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
416 | llc->daddr.lsap, LLC_PDU_CMD); | |
417 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
418 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 419 | if (likely(!rc)) { |
1da177e4 LT |
420 | llc_conn_send_pdu(sk, skb); |
421 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
427 | { | |
428 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
429 | u8 nr = LLC_I_GET_NR(pdu); | |
430 | ||
431 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
436 | struct sk_buff *skb) | |
437 | { | |
438 | u8 nr; | |
439 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
440 | int rc = -ENOBUFS; | |
1d67e650 ACM |
441 | struct llc_sock *llc = llc_sk(sk); |
442 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
443 | |
444 | if (nskb) { | |
1da177e4 LT |
445 | struct llc_sap *sap = llc->sap; |
446 | ||
1da177e4 LT |
447 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
448 | llc->daddr.lsap, LLC_PDU_RSP); | |
449 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
450 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 451 | if (likely(!rc)) |
1da177e4 LT |
452 | llc_conn_send_pdu(sk, nskb); |
453 | else | |
454 | kfree_skb(skb); | |
455 | } | |
456 | if (rc) { | |
457 | nr = LLC_I_GET_NR(pdu); | |
458 | rc = 0; | |
459 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
460 | } | |
461 | return rc; | |
462 | } | |
463 | ||
464 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
465 | { | |
466 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
467 | u8 nr = LLC_I_GET_NR(pdu); | |
468 | ||
469 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
474 | { | |
475 | int rc = -ENOBUFS; | |
1d67e650 ACM |
476 | struct llc_sock *llc = llc_sk(sk); |
477 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
478 | |
479 | if (nskb) { | |
1da177e4 LT |
480 | struct llc_sap *sap = llc->sap; |
481 | ||
1da177e4 LT |
482 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
483 | llc->daddr.lsap, LLC_PDU_CMD); | |
484 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
485 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 486 | if (unlikely(rc)) |
1da177e4 LT |
487 | goto free; |
488 | llc_conn_send_pdu(sk, nskb); | |
489 | } | |
490 | out: | |
491 | return rc; | |
492 | free: | |
493 | kfree_skb(nskb); | |
494 | goto out; | |
495 | } | |
496 | ||
497 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
498 | { | |
499 | int rc = -ENOBUFS; | |
1d67e650 ACM |
500 | struct llc_sock *llc = llc_sk(sk); |
501 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
502 | |
503 | if (nskb) { | |
1da177e4 LT |
504 | struct llc_sap *sap = llc->sap; |
505 | ||
1da177e4 LT |
506 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
507 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 508 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
1da177e4 | 509 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 510 | if (unlikely(rc)) |
1da177e4 LT |
511 | goto free; |
512 | llc_conn_send_pdu(sk, nskb); | |
513 | } | |
514 | out: | |
515 | return rc; | |
516 | free: | |
517 | kfree_skb(nskb); | |
518 | goto out; | |
519 | } | |
520 | ||
521 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
522 | { | |
523 | int rc = -ENOBUFS; | |
1d67e650 ACM |
524 | struct llc_sock *llc = llc_sk(sk); |
525 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
526 | |
527 | if (nskb) { | |
1da177e4 | 528 | struct llc_sap *sap = llc->sap; |
1da177e4 | 529 | |
1da177e4 LT |
530 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
531 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 532 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
1da177e4 | 533 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 534 | if (unlikely(rc)) |
1da177e4 LT |
535 | goto free; |
536 | llc_conn_send_pdu(sk, nskb); | |
537 | } | |
538 | out: | |
539 | return rc; | |
540 | free: | |
541 | kfree_skb(nskb); | |
542 | goto out; | |
543 | } | |
544 | ||
545 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
546 | { | |
547 | int rc = -ENOBUFS; | |
1d67e650 ACM |
548 | struct llc_sock *llc = llc_sk(sk); |
549 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
550 | |
551 | if (nskb) { | |
1da177e4 LT |
552 | struct llc_sap *sap = llc->sap; |
553 | ||
1da177e4 LT |
554 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
555 | llc->daddr.lsap, LLC_PDU_CMD); | |
556 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
557 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 558 | if (unlikely(rc)) |
1da177e4 LT |
559 | goto free; |
560 | llc_conn_send_pdu(sk, nskb); | |
561 | } | |
562 | out: | |
563 | return rc; | |
564 | free: | |
565 | kfree_skb(nskb); | |
566 | goto out; | |
567 | } | |
568 | ||
569 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
570 | { | |
571 | int rc = -ENOBUFS; | |
1d67e650 ACM |
572 | struct llc_sock *llc = llc_sk(sk); |
573 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
574 | |
575 | if (nskb) { | |
1da177e4 | 576 | struct llc_sap *sap = llc->sap; |
1da177e4 | 577 | |
1da177e4 LT |
578 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
579 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 580 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
1da177e4 | 581 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 582 | if (unlikely(rc)) |
1da177e4 LT |
583 | goto free; |
584 | llc_conn_send_pdu(sk, nskb); | |
585 | } | |
586 | out: | |
587 | return rc; | |
588 | free: | |
589 | kfree_skb(nskb); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
594 | { | |
595 | int rc = -ENOBUFS; | |
1d67e650 ACM |
596 | struct llc_sock *llc = llc_sk(sk); |
597 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
598 | |
599 | if (nskb) { | |
1da177e4 LT |
600 | struct llc_sap *sap = llc->sap; |
601 | ||
1da177e4 LT |
602 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
603 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 604 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
1da177e4 | 605 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 606 | if (unlikely(rc)) |
1da177e4 LT |
607 | goto free; |
608 | llc_conn_send_pdu(sk, nskb); | |
609 | } | |
610 | out: | |
611 | return rc; | |
612 | free: | |
613 | kfree_skb(nskb); | |
614 | goto out; | |
615 | } | |
616 | ||
617 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
618 | { | |
619 | struct llc_sock *llc = llc_sk(sk); | |
620 | ||
621 | if (!llc->remote_busy_flag) { | |
622 | llc->remote_busy_flag = 1; | |
623 | mod_timer(&llc->busy_state_timer.timer, | |
590232a7 | 624 | jiffies + llc->busy_state_timer.expire); |
1da177e4 LT |
625 | } |
626 | return 0; | |
627 | } | |
628 | ||
629 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
630 | { | |
631 | int rc = -ENOBUFS; | |
1d67e650 ACM |
632 | struct llc_sock *llc = llc_sk(sk); |
633 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
634 | |
635 | if (nskb) { | |
1da177e4 LT |
636 | struct llc_sap *sap = llc->sap; |
637 | ||
1da177e4 LT |
638 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
639 | llc->daddr.lsap, LLC_PDU_RSP); | |
640 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
641 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 642 | if (unlikely(rc)) |
1da177e4 LT |
643 | goto free; |
644 | llc_conn_send_pdu(sk, nskb); | |
645 | } | |
646 | out: | |
647 | return rc; | |
648 | free: | |
649 | kfree_skb(nskb); | |
650 | goto out; | |
651 | } | |
652 | ||
653 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
654 | { | |
655 | int rc = -ENOBUFS; | |
1d67e650 ACM |
656 | struct llc_sock *llc = llc_sk(sk); |
657 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
658 | |
659 | if (nskb) { | |
1da177e4 LT |
660 | struct llc_sap *sap = llc->sap; |
661 | ||
1da177e4 LT |
662 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
663 | llc->daddr.lsap, LLC_PDU_CMD); | |
664 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
665 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 666 | if (unlikely(rc)) |
1da177e4 LT |
667 | goto free; |
668 | llc_conn_send_pdu(sk, nskb); | |
669 | } | |
670 | out: | |
671 | return rc; | |
672 | free: | |
673 | kfree_skb(nskb); | |
674 | goto out; | |
675 | } | |
676 | ||
677 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
678 | { | |
679 | int rc = -ENOBUFS; | |
1d67e650 ACM |
680 | struct llc_sock *llc = llc_sk(sk); |
681 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
682 | |
683 | if (nskb) { | |
1da177e4 LT |
684 | struct llc_sap *sap = llc->sap; |
685 | u8 f_bit = 1; | |
686 | ||
1da177e4 LT |
687 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
688 | llc->daddr.lsap, LLC_PDU_RSP); | |
689 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
690 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 691 | if (unlikely(rc)) |
1da177e4 LT |
692 | goto free; |
693 | llc_conn_send_pdu(sk, nskb); | |
694 | } | |
695 | out: | |
696 | return rc; | |
697 | free: | |
698 | kfree_skb(nskb); | |
699 | goto out; | |
700 | } | |
701 | ||
702 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
703 | { | |
704 | int rc = -ENOBUFS; | |
1d67e650 ACM |
705 | struct llc_sock *llc = llc_sk(sk); |
706 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
707 | |
708 | if (nskb) { | |
1da177e4 | 709 | struct llc_sap *sap = llc->sap; |
1da177e4 | 710 | |
1da177e4 LT |
711 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
712 | llc->daddr.lsap, LLC_PDU_RSP); | |
838a75da | 713 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
1da177e4 | 714 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
249ff1c6 | 715 | if (unlikely(rc)) |
1da177e4 LT |
716 | goto free; |
717 | llc_conn_send_pdu(sk, nskb); | |
718 | } | |
719 | out: | |
720 | return rc; | |
721 | free: | |
722 | kfree_skb(nskb); | |
723 | goto out; | |
724 | } | |
725 | ||
726 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
727 | { | |
728 | int rc = -ENOBUFS; | |
1d67e650 ACM |
729 | struct llc_sock *llc = llc_sk(sk); |
730 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
731 | |
732 | if (nskb) { | |
1da177e4 LT |
733 | struct llc_sap *sap = llc->sap; |
734 | ||
1da177e4 LT |
735 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
736 | llc->daddr.lsap, LLC_PDU_RSP); | |
737 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
738 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 739 | if (unlikely(rc)) |
1da177e4 LT |
740 | goto free; |
741 | llc_conn_send_pdu(sk, nskb); | |
742 | } | |
743 | out: | |
744 | return rc; | |
745 | free: | |
746 | kfree_skb(nskb); | |
747 | goto out; | |
748 | } | |
749 | ||
750 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
751 | { | |
752 | int rc = -ENOBUFS; | |
1d67e650 ACM |
753 | struct llc_sock *llc = llc_sk(sk); |
754 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
755 | |
756 | if (nskb) { | |
1da177e4 LT |
757 | struct llc_sap *sap = llc->sap; |
758 | ||
1da177e4 LT |
759 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
760 | llc->daddr.lsap, LLC_PDU_RSP); | |
761 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
762 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 763 | if (unlikely(rc)) |
1da177e4 LT |
764 | goto free; |
765 | llc_conn_send_pdu(sk, nskb); | |
766 | } | |
767 | out: | |
768 | return rc; | |
769 | free: | |
770 | kfree_skb(nskb); | |
771 | goto out; | |
772 | } | |
773 | ||
774 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
775 | { | |
776 | int state_changed = llc_sk(sk)->p_flag && !value; | |
777 | ||
778 | llc_sk(sk)->p_flag = value; | |
779 | ||
780 | if (state_changed) | |
781 | sk->sk_state_change(sk); | |
782 | } | |
783 | ||
784 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
785 | { | |
786 | int rc = -ENOBUFS; | |
1da177e4 | 787 | struct llc_sock *llc = llc_sk(sk); |
1d67e650 | 788 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); |
1da177e4 LT |
789 | |
790 | if (nskb) { | |
791 | struct llc_sap *sap = llc->sap; | |
792 | u8 *dmac = llc->daddr.mac; | |
793 | ||
794 | if (llc->dev->flags & IFF_LOOPBACK) | |
795 | dmac = llc->dev->dev_addr; | |
1da177e4 LT |
796 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
797 | llc->daddr.lsap, LLC_PDU_CMD); | |
798 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
799 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
249ff1c6 | 800 | if (unlikely(rc)) |
1da177e4 LT |
801 | goto free; |
802 | llc_conn_send_pdu(sk, nskb); | |
803 | llc_conn_set_p_flag(sk, 1); | |
804 | } | |
805 | out: | |
806 | return rc; | |
807 | free: | |
808 | kfree_skb(nskb); | |
809 | goto out; | |
810 | } | |
811 | ||
812 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
813 | { | |
814 | u8 f_bit; | |
815 | int rc = -ENOBUFS; | |
1d67e650 ACM |
816 | struct llc_sock *llc = llc_sk(sk); |
817 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
818 | |
819 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
820 | if (nskb) { | |
1da177e4 LT |
821 | struct llc_sap *sap = llc->sap; |
822 | ||
823 | nskb->dev = llc->dev; | |
824 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
825 | llc->daddr.lsap, LLC_PDU_RSP); | |
826 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
827 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 828 | if (unlikely(rc)) |
1da177e4 LT |
829 | goto free; |
830 | llc_conn_send_pdu(sk, nskb); | |
831 | } | |
832 | out: | |
833 | return rc; | |
834 | free: | |
835 | kfree_skb(nskb); | |
836 | goto out; | |
837 | } | |
838 | ||
839 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
840 | { | |
841 | llc_sk(sk)->s_flag = 0; | |
842 | return 0; | |
843 | } | |
844 | ||
845 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
846 | { | |
847 | llc_sk(sk)->s_flag = 1; | |
848 | return 0; | |
849 | } | |
850 | ||
851 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
852 | { | |
853 | struct llc_sock *llc = llc_sk(sk); | |
854 | ||
855 | llc_conn_set_p_flag(sk, 1); | |
856 | mod_timer(&llc->pf_cycle_timer.timer, | |
590232a7 | 857 | jiffies + llc->pf_cycle_timer.expire); |
1da177e4 LT |
858 | return 0; |
859 | } | |
860 | ||
861 | /** | |
862 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
863 | * @sk: current connection structure | |
864 | * @skb: current event | |
865 | * | |
866 | * Checks number of received PDUs which have not been acknowledged, yet, | |
867 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
868 | * sends an RR response as acknowledgement for them. Returns 0 for | |
869 | * success, 1 otherwise. | |
870 | */ | |
871 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
872 | { | |
873 | u8 pf_bit; | |
874 | struct llc_sock *llc = llc_sk(sk); | |
875 | ||
876 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
877 | llc->ack_pf |= pf_bit & 1; | |
878 | if (!llc->ack_must_be_send) { | |
879 | llc->first_pdu_Ns = llc->vR; | |
880 | llc->ack_must_be_send = 1; | |
881 | llc->ack_pf = pf_bit & 1; | |
882 | } | |
883 | if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) { | |
884 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); | |
885 | llc->ack_must_be_send = 0; | |
886 | llc->ack_pf = 0; | |
887 | llc_conn_ac_inc_npta_value(sk, skb); | |
888 | } | |
889 | return 0; | |
890 | } | |
891 | ||
892 | /** | |
893 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag | |
894 | * @sk: current connection structure | |
895 | * @skb: current event | |
896 | * | |
897 | * This action resets ack_must_be_send flag of given connection, this flag | |
898 | * indicates if there is any PDU which has not been acknowledged yet. | |
899 | * Returns 0 for success, 1 otherwise. | |
900 | */ | |
901 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) | |
902 | { | |
903 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; | |
904 | return 0; | |
905 | } | |
906 | ||
907 | /** | |
908 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs | |
909 | * @sk: current connection structure | |
910 | * @skb: current event | |
911 | * | |
912 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to | |
913 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is | |
914 | * set to one if one PDU with p-bit set to one is received. Returns 0 for | |
915 | * success, 1 otherwise. | |
916 | */ | |
917 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, | |
918 | struct sk_buff *skb) | |
919 | { | |
920 | int rc; | |
921 | struct llc_sock *llc = llc_sk(sk); | |
922 | struct llc_sap *sap = llc->sap; | |
923 | ||
924 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
925 | llc->daddr.lsap, LLC_PDU_RSP); | |
926 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); | |
927 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 928 | if (likely(!rc)) { |
1da177e4 LT |
929 | llc_conn_send_pdu(sk, skb); |
930 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
931 | } | |
932 | return rc; | |
933 | } | |
934 | ||
935 | /** | |
936 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs | |
937 | * @sk: current connection structure. | |
938 | * @skb: current event. | |
939 | * | |
940 | * This action sends an I-format PDU as acknowledge to received PDUs which | |
941 | * have not been acknowledged, yet, if there is any. By using of this | |
942 | * action number of acknowledgements decreases, this technic is called | |
943 | * piggy backing. Returns 0 for success, 1 otherwise. | |
944 | */ | |
945 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) | |
946 | { | |
947 | struct llc_sock *llc = llc_sk(sk); | |
948 | ||
949 | if (llc->ack_must_be_send) { | |
950 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); | |
951 | llc->ack_must_be_send = 0 ; | |
952 | llc->ack_pf = 0; | |
953 | } else | |
954 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); | |
955 | return 0; | |
956 | } | |
957 | ||
958 | /** | |
959 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked | |
960 | * @sk: current connection structure. | |
961 | * @skb: current event. | |
962 | * | |
963 | * This action sends an RR response with f-bit set to ack_pf flag as | |
964 | * acknowledge to all received PDUs which have not been acknowledged, yet, | |
965 | * if there is any. ack_pf flag indicates if a PDU has been received with | |
966 | * p-bit set to one. Returns 0 for success, 1 otherwise. | |
967 | */ | |
968 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
969 | struct sk_buff *skb) | |
970 | { | |
971 | int rc = -ENOBUFS; | |
1d67e650 ACM |
972 | struct llc_sock *llc = llc_sk(sk); |
973 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
974 | |
975 | if (nskb) { | |
1da177e4 LT |
976 | struct llc_sap *sap = llc->sap; |
977 | ||
1da177e4 LT |
978 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
979 | llc->daddr.lsap, LLC_PDU_RSP); | |
980 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); | |
981 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
249ff1c6 | 982 | if (unlikely(rc)) |
1da177e4 LT |
983 | goto free; |
984 | llc_conn_send_pdu(sk, nskb); | |
985 | } | |
986 | out: | |
987 | return rc; | |
988 | free: | |
989 | kfree_skb(nskb); | |
990 | goto out; | |
991 | } | |
992 | ||
993 | /** | |
994 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater | |
995 | * @sk: current connection structure. | |
996 | * @skb: current event. | |
997 | * | |
998 | * After "inc_cntr" times calling of this action, "npta" increase by one. | |
999 | * this action tries to make vale of "npta" greater as possible; number of | |
1000 | * acknowledgements decreases by increasing of "npta". Returns 0 for | |
1001 | * success, 1 otherwise. | |
1002 | */ | |
1003 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) | |
1004 | { | |
1005 | struct llc_sock *llc = llc_sk(sk); | |
1006 | ||
1007 | if (!llc->inc_cntr) { | |
1008 | llc->dec_step = 0; | |
1009 | llc->dec_cntr = llc->inc_cntr = 2; | |
1010 | ++llc->npta; | |
1011 | if (llc->npta > 127) | |
1012 | llc->npta = 127 ; | |
1013 | } else | |
1014 | --llc->inc_cntr; | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one | |
1020 | * @sk: current connection structure. | |
1021 | * @skb: current event. | |
1022 | * | |
1023 | * After receiving "dec_cntr" times RR command, this action decreases | |
1024 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1025 | */ | |
1026 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) | |
1027 | { | |
1028 | struct llc_sock *llc = llc_sk(sk); | |
1029 | ||
1030 | if (!llc->connect_step && !llc->remote_busy_flag) { | |
1031 | if (!llc->dec_step) { | |
1032 | if (!llc->dec_cntr) { | |
1033 | llc->inc_cntr = llc->dec_cntr = 2; | |
1034 | if (llc->npta > 0) | |
1035 | llc->npta = llc->npta - 1; | |
1036 | } else | |
1037 | llc->dec_cntr -=1; | |
1038 | } | |
1039 | } else | |
1040 | llc->connect_step = 0 ; | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one | |
1046 | * @sk: current connection structure. | |
1047 | * @skb: current event. | |
1048 | * | |
1049 | * After receiving "dec_cntr" times RNR command, this action decreases | |
1050 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1051 | */ | |
1052 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) | |
1053 | { | |
1054 | struct llc_sock *llc = llc_sk(sk); | |
1055 | ||
1056 | if (llc->remote_busy_flag) | |
1057 | if (!llc->dec_step) { | |
1058 | if (!llc->dec_cntr) { | |
1059 | llc->inc_cntr = llc->dec_cntr = 2; | |
1060 | if (llc->npta > 0) | |
1061 | --llc->npta; | |
1062 | } else | |
1063 | --llc->dec_cntr; | |
1064 | } | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * llc_conn_ac_dec_tx_win_size - decreases tx window size | |
1070 | * @sk: current connection structure. | |
1071 | * @skb: current event. | |
1072 | * | |
1073 | * After receiving of a REJ command or response, transmit window size is | |
1074 | * decreased by number of PDUs which are outstanding yet. Returns 0 for | |
1075 | * success, 1 otherwise. | |
1076 | */ | |
1077 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1078 | { | |
1079 | struct llc_sock *llc = llc_sk(sk); | |
1080 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); | |
1081 | ||
1082 | llc->k -= unacked_pdu; | |
1083 | if (llc->k < 2) | |
1084 | llc->k = 2; | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1090 | * @sk: current connection structure. | |
1091 | * @skb: current event. | |
1092 | * | |
1093 | * After receiving an RR response with f-bit set to one, transmit window | |
1094 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1095 | */ | |
1096 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1097 | { | |
1098 | struct llc_sock *llc = llc_sk(sk); | |
1099 | ||
1100 | llc->k += 1; | |
1101 | if (llc->k > 128) | |
1102 | llc->k = 128 ; | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1107 | { | |
1108 | struct llc_sock *llc = llc_sk(sk); | |
1109 | ||
1110 | del_timer(&llc->pf_cycle_timer.timer); | |
1111 | del_timer(&llc->ack_timer.timer); | |
1112 | del_timer(&llc->rej_sent_timer.timer); | |
1113 | del_timer(&llc->busy_state_timer.timer); | |
1114 | llc->ack_must_be_send = 0; | |
1115 | llc->ack_pf = 0; | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1120 | { | |
1121 | struct llc_sock *llc = llc_sk(sk); | |
1122 | ||
1123 | del_timer(&llc->rej_sent_timer.timer); | |
1124 | del_timer(&llc->pf_cycle_timer.timer); | |
1125 | del_timer(&llc->busy_state_timer.timer); | |
1126 | llc->ack_must_be_send = 0; | |
1127 | llc->ack_pf = 0; | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1132 | { | |
1133 | struct llc_sock *llc = llc_sk(sk); | |
1134 | ||
590232a7 | 1135 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1136 | return 0; |
1137 | } | |
1138 | ||
1139 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1140 | { | |
1141 | struct llc_sock *llc = llc_sk(sk); | |
1142 | ||
1143 | mod_timer(&llc->rej_sent_timer.timer, | |
590232a7 | 1144 | jiffies + llc->rej_sent_timer.expire); |
1da177e4 LT |
1145 | return 0; |
1146 | } | |
1147 | ||
1148 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, | |
1149 | struct sk_buff *skb) | |
1150 | { | |
1151 | struct llc_sock *llc = llc_sk(sk); | |
1152 | ||
1153 | if (!timer_pending(&llc->ack_timer.timer)) | |
1154 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1155 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1156 | return 0; |
1157 | } | |
1158 | ||
1159 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1160 | { | |
1161 | del_timer(&llc_sk(sk)->ack_timer.timer); | |
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) | |
1166 | { | |
1167 | struct llc_sock *llc = llc_sk(sk); | |
1168 | ||
1169 | del_timer(&llc->pf_cycle_timer.timer); | |
1170 | llc_conn_set_p_flag(sk, 0); | |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1175 | { | |
1176 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) | |
1181 | { | |
1182 | int acked; | |
1183 | u16 unacked = 0; | |
1184 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1185 | struct llc_sock *llc = llc_sk(sk); | |
1186 | ||
1187 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); | |
1188 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); | |
1189 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ | |
1190 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { | |
1191 | llc->retry_count = 0; | |
1192 | del_timer(&llc->ack_timer.timer); | |
1193 | if (llc->failed_data_req) { | |
1194 | /* already, we did not accept data from upper layer | |
1195 | * (tx_window full or unacceptable state). Now, we | |
1196 | * can send data and must inform to upper layer. | |
1197 | */ | |
1198 | llc->failed_data_req = 0; | |
1199 | llc_conn_ac_data_confirm(sk, skb); | |
1200 | } | |
1201 | if (unacked) | |
1202 | mod_timer(&llc->ack_timer.timer, | |
590232a7 | 1203 | jiffies + llc->ack_timer.expire); |
1da177e4 LT |
1204 | } else if (llc->failed_data_req) { |
1205 | u8 f_bit; | |
1206 | ||
1207 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1208 | if (f_bit == 1) { | |
1209 | llc->failed_data_req = 0; | |
1210 | llc_conn_ac_data_confirm(sk, skb); | |
1211 | } | |
1212 | } | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) | |
1217 | { | |
1218 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1219 | ||
1220 | if (LLC_PDU_IS_RSP(pdu)) { | |
1221 | u8 f_bit; | |
1222 | ||
1223 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1224 | if (f_bit) { | |
1225 | llc_conn_set_p_flag(sk, 0); | |
1226 | llc_conn_ac_stop_p_timer(sk, skb); | |
1227 | } | |
1228 | } | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) | |
1233 | { | |
1234 | llc_sk(sk)->data_flag = 2; | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) | |
1239 | { | |
1240 | llc_sk(sk)->data_flag = 0; | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) | |
1245 | { | |
1246 | llc_sk(sk)->data_flag = 1; | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, | |
1251 | struct sk_buff *skb) | |
1252 | { | |
1253 | if (!llc_sk(sk)->data_flag) | |
1254 | llc_sk(sk)->data_flag = 1; | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) | |
1259 | { | |
1260 | llc_conn_set_p_flag(sk, 0); | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) | |
1265 | { | |
1266 | llc_conn_set_p_flag(sk, 1); | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) | |
1271 | { | |
1272 | llc_sk(sk)->remote_busy_flag = 0; | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) | |
1277 | { | |
1278 | llc_sk(sk)->cause_flag = 0; | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) | |
1283 | { | |
1284 | llc_sk(sk)->cause_flag = 1; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) | |
1289 | { | |
1290 | llc_sk(sk)->retry_count = 0; | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) | |
1295 | { | |
1296 | llc_sk(sk)->retry_count++; | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) | |
1301 | { | |
1302 | llc_sk(sk)->vR = 0; | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) | |
1307 | { | |
1308 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) | |
1313 | { | |
1314 | llc_sk(sk)->vS = 0; | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) | |
1319 | { | |
1320 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; | |
1321 | return 0; | |
1322 | } | |
1323 | ||
2928c19e | 1324 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
1325 | { |
1326 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128; | |
1327 | return 0; | |
1328 | } | |
1329 | ||
e0dd5519 | 1330 | static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) |
1da177e4 LT |
1331 | { |
1332 | struct sock *sk = (struct sock *)timeout_data; | |
1333 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1334 | ||
1335 | bh_lock_sock(sk); | |
1336 | if (skb) { | |
1337 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1338 | ||
04e4223f | 1339 | skb_set_owner_r(skb, sk); |
e0dd5519 | 1340 | ev->type = type; |
1da177e4 LT |
1341 | llc_process_tmr_ev(sk, skb); |
1342 | } | |
1343 | bh_unlock_sock(sk); | |
1344 | } | |
1345 | ||
e0dd5519 | 1346 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) |
1da177e4 | 1347 | { |
e0dd5519 ACM |
1348 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); |
1349 | } | |
1da177e4 | 1350 | |
e0dd5519 ACM |
1351 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) |
1352 | { | |
1353 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); | |
1da177e4 LT |
1354 | } |
1355 | ||
1356 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) | |
1357 | { | |
e0dd5519 | 1358 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); |
1da177e4 LT |
1359 | } |
1360 | ||
1361 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) | |
1362 | { | |
e0dd5519 | 1363 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); |
1da177e4 LT |
1364 | } |
1365 | ||
1366 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) | |
1367 | { | |
1368 | llc_sk(sk)->X = llc_sk(sk)->vS; | |
1369 | llc_conn_ac_set_vs_nr(sk, skb); | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) | |
1374 | { | |
1375 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1376 | u8 nr = PDU_SUPV_GET_Nr(pdu); | |
1377 | ||
1378 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) | |
1379 | llc_conn_ac_set_vs_nr(sk, skb); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * Non-standard actions; these not contained in IEEE specification; for | |
1385 | * our own usage | |
1386 | */ | |
1387 | /** | |
1388 | * llc_conn_disc - removes connection from SAP list and frees it | |
1389 | * @sk: closed connection | |
1390 | * @skb: occurred event | |
1391 | */ | |
1392 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) | |
1393 | { | |
1394 | /* FIXME: this thing seems to want to die */ | |
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * llc_conn_reset - resets connection | |
1400 | * @sk : reseting connection. | |
1401 | * @skb: occurred event. | |
1402 | * | |
1403 | * Stop all timers, empty all queues and reset all flags. | |
1404 | */ | |
1405 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) | |
1406 | { | |
1407 | llc_sk_reset(sk); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | /** | |
1412 | * llc_circular_between - designates that b is between a and c or not | |
1413 | * @a: lower bound | |
1414 | * @b: element to see if is between a and b | |
1415 | * @c: upper bound | |
1416 | * | |
1417 | * This function designates that b is between a and c or not (for example, | |
1418 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 | |
1419 | * otherwise. | |
1420 | */ | |
1421 | u8 llc_circular_between(u8 a, u8 b, u8 c) | |
1422 | { | |
1423 | b = b - a; | |
1424 | c = c - a; | |
1425 | return b <= c; | |
1426 | } | |
1427 | ||
1428 | /** | |
1429 | * llc_process_tmr_ev - timer backend | |
1430 | * @sk: active connection | |
1431 | * @skb: occurred event | |
1432 | * | |
1433 | * This function is called from timer callback functions. When connection | |
1434 | * is busy (during sending a data frame) timer expiration event must be | |
1435 | * queued. Otherwise this event can be sent to connection state machine. | |
1436 | * Queued events will process by llc_backlog_rcv function after sending | |
1437 | * data frame. | |
1438 | */ | |
1439 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) | |
1440 | { | |
1441 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { | |
1442 | printk(KERN_WARNING "%s: timer called on closed connection\n", | |
1443 | __FUNCTION__); | |
1444 | kfree_skb(skb); | |
1445 | } else { | |
1446 | if (!sock_owned_by_user(sk)) | |
1447 | llc_conn_state_process(sk, skb); | |
1448 | else { | |
1449 | llc_set_backlog_type(skb, LLC_EVENT); | |
1450 | sk_add_backlog(sk, skb); | |
1451 | } | |
1452 | } | |
1453 | } |