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