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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * llc_c_ac.c - actions performed during connection state transition. | |
3 | * | |
4 | * Description: | |
5 | * Functions in this module are implementation of connection component actions | |
6 | * Details of actions can be found in IEEE-802.2 standard document. | |
7 | * All functions have one connection and one event as input argument. All of | |
8 | * them return 0 On success and 1 otherwise. | |
9 | * | |
10 | * Copyright (c) 1997 by Procom Technology, Inc. | |
11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
12 | * | |
13 | * This program can be redistributed or modified under the terms of the | |
14 | * GNU General Public License as published by the Free Software Foundation. | |
15 | * This program is distributed without any warranty or implied warranty | |
16 | * of merchantability or fitness for a particular purpose. | |
17 | * | |
18 | * See the GNU General Public License for more details. | |
19 | */ | |
20 | #include <linux/netdevice.h> | |
21 | #include <net/llc_conn.h> | |
22 | #include <net/llc_sap.h> | |
23 | #include <net/sock.h> | |
24 | #include <net/llc_c_ev.h> | |
25 | #include <net/llc_c_ac.h> | |
26 | #include <net/llc_c_st.h> | |
27 | #include <net/llc_pdu.h> | |
28 | #include <net/llc.h> | |
29 | ||
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 LT |
269 | struct llc_sap *sap = llc->sap; |
270 | u8 f_bit = 1; | |
271 | ||
1da177e4 LT |
272 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
273 | llc->daddr.lsap, LLC_PDU_RSP); | |
274 | llc_pdu_init_as_dm_rsp(nskb, f_bit); | |
275 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
276 | if (rc) | |
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); | |
309 | if (rc) | |
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) { | |
327 | u8 f_bit = 0; | |
1da177e4 LT |
328 | struct llc_sap *sap = llc->sap; |
329 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
330 | ||
1da177e4 LT |
331 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
332 | llc->daddr.lsap, LLC_PDU_RSP); | |
333 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
334 | llc->vR, INCORRECT); | |
335 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
336 | if (rc) | |
337 | goto free; | |
338 | llc_conn_send_pdu(sk, nskb); | |
339 | } | |
340 | out: | |
341 | return rc; | |
342 | free: | |
343 | kfree_skb(nskb); | |
344 | goto out; | |
345 | } | |
346 | ||
347 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
348 | { | |
349 | u8 f_bit; | |
350 | int rc = -ENOBUFS; | |
351 | struct sk_buff *nskb; | |
1d67e650 | 352 | struct llc_sock *llc = llc_sk(sk); |
1da177e4 LT |
353 | |
354 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1d67e650 | 355 | nskb = llc_alloc_frame(llc->dev); |
1da177e4 | 356 | if (nskb) { |
1da177e4 LT |
357 | struct llc_sap *sap = llc->sap; |
358 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
359 | ||
1da177e4 LT |
360 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
361 | llc->daddr.lsap, LLC_PDU_RSP); | |
362 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
363 | llc->vR, INCORRECT); | |
364 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
365 | if (rc) | |
366 | goto free; | |
367 | llc_conn_send_pdu(sk, nskb); | |
368 | } | |
369 | out: | |
370 | return rc; | |
371 | free: | |
372 | kfree_skb(nskb); | |
373 | goto out; | |
374 | } | |
375 | ||
376 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
377 | { | |
378 | int rc; | |
379 | struct llc_sock *llc = llc_sk(sk); | |
380 | struct llc_sap *sap = llc->sap; | |
381 | ||
382 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
383 | llc->daddr.lsap, LLC_PDU_CMD); | |
384 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
385 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
386 | if (!rc) { | |
387 | llc_conn_send_pdu(sk, skb); | |
388 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
389 | } | |
390 | return rc; | |
391 | } | |
392 | ||
393 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
394 | { | |
395 | int rc; | |
396 | struct llc_sock *llc = llc_sk(sk); | |
397 | struct llc_sap *sap = llc->sap; | |
398 | ||
399 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
400 | llc->daddr.lsap, LLC_PDU_CMD); | |
401 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
402 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
403 | if (!rc) { | |
404 | llc_conn_send_pdu(sk, skb); | |
405 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
406 | } | |
407 | return rc; | |
408 | } | |
409 | ||
410 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
411 | { | |
412 | int rc; | |
413 | struct llc_sock *llc = llc_sk(sk); | |
414 | struct llc_sap *sap = llc->sap; | |
415 | ||
416 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
417 | llc->daddr.lsap, LLC_PDU_CMD); | |
418 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
419 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
420 | if (!rc) { | |
421 | llc_conn_send_pdu(sk, skb); | |
422 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
423 | } | |
424 | return 0; | |
425 | } | |
426 | ||
427 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
428 | { | |
429 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
430 | u8 nr = LLC_I_GET_NR(pdu); | |
431 | ||
432 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
437 | struct sk_buff *skb) | |
438 | { | |
439 | u8 nr; | |
440 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
441 | int rc = -ENOBUFS; | |
1d67e650 ACM |
442 | struct llc_sock *llc = llc_sk(sk); |
443 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
444 | |
445 | if (nskb) { | |
1da177e4 LT |
446 | struct llc_sap *sap = llc->sap; |
447 | ||
1da177e4 LT |
448 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
449 | llc->daddr.lsap, LLC_PDU_RSP); | |
450 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
451 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
452 | if (!rc) | |
453 | llc_conn_send_pdu(sk, nskb); | |
454 | else | |
455 | kfree_skb(skb); | |
456 | } | |
457 | if (rc) { | |
458 | nr = LLC_I_GET_NR(pdu); | |
459 | rc = 0; | |
460 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
461 | } | |
462 | return rc; | |
463 | } | |
464 | ||
465 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
466 | { | |
467 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
468 | u8 nr = LLC_I_GET_NR(pdu); | |
469 | ||
470 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
475 | { | |
476 | int rc = -ENOBUFS; | |
1d67e650 ACM |
477 | struct llc_sock *llc = llc_sk(sk); |
478 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
479 | |
480 | if (nskb) { | |
1da177e4 LT |
481 | struct llc_sap *sap = llc->sap; |
482 | ||
1da177e4 LT |
483 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
484 | llc->daddr.lsap, LLC_PDU_CMD); | |
485 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
486 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
487 | if (rc) | |
488 | goto free; | |
489 | llc_conn_send_pdu(sk, nskb); | |
490 | } | |
491 | out: | |
492 | return rc; | |
493 | free: | |
494 | kfree_skb(nskb); | |
495 | goto out; | |
496 | } | |
497 | ||
498 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
499 | { | |
500 | int rc = -ENOBUFS; | |
1d67e650 ACM |
501 | struct llc_sock *llc = llc_sk(sk); |
502 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
503 | |
504 | if (nskb) { | |
505 | u8 f_bit = 1; | |
1da177e4 LT |
506 | struct llc_sap *sap = llc->sap; |
507 | ||
1da177e4 LT |
508 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
509 | llc->daddr.lsap, LLC_PDU_RSP); | |
510 | llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR); | |
511 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
512 | if (rc) | |
513 | goto free; | |
514 | llc_conn_send_pdu(sk, nskb); | |
515 | } | |
516 | out: | |
517 | return rc; | |
518 | free: | |
519 | kfree_skb(nskb); | |
520 | goto out; | |
521 | } | |
522 | ||
523 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
524 | { | |
525 | int rc = -ENOBUFS; | |
1d67e650 ACM |
526 | struct llc_sock *llc = llc_sk(sk); |
527 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
528 | |
529 | if (nskb) { | |
1da177e4 LT |
530 | struct llc_sap *sap = llc->sap; |
531 | u8 f_bit = 0; | |
532 | ||
1da177e4 LT |
533 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
534 | llc->daddr.lsap, LLC_PDU_RSP); | |
535 | llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR); | |
536 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
537 | if (rc) | |
538 | goto free; | |
539 | llc_conn_send_pdu(sk, nskb); | |
540 | } | |
541 | out: | |
542 | return rc; | |
543 | free: | |
544 | kfree_skb(nskb); | |
545 | goto out; | |
546 | } | |
547 | ||
548 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
549 | { | |
550 | int rc = -ENOBUFS; | |
1d67e650 ACM |
551 | struct llc_sock *llc = llc_sk(sk); |
552 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
553 | |
554 | if (nskb) { | |
1da177e4 LT |
555 | struct llc_sap *sap = llc->sap; |
556 | ||
1da177e4 LT |
557 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
558 | llc->daddr.lsap, LLC_PDU_CMD); | |
559 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
560 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
561 | if (rc) | |
562 | goto free; | |
563 | llc_conn_send_pdu(sk, nskb); | |
564 | } | |
565 | out: | |
566 | return rc; | |
567 | free: | |
568 | kfree_skb(nskb); | |
569 | goto out; | |
570 | } | |
571 | ||
572 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
573 | { | |
574 | int rc = -ENOBUFS; | |
1d67e650 ACM |
575 | struct llc_sock *llc = llc_sk(sk); |
576 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
577 | |
578 | if (nskb) { | |
1da177e4 LT |
579 | struct llc_sap *sap = llc->sap; |
580 | u8 f_bit = 1; | |
581 | ||
1da177e4 LT |
582 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
583 | llc->daddr.lsap, LLC_PDU_RSP); | |
584 | llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR); | |
585 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
586 | if (rc) | |
587 | goto free; | |
588 | llc_conn_send_pdu(sk, nskb); | |
589 | } | |
590 | out: | |
591 | return rc; | |
592 | free: | |
593 | kfree_skb(nskb); | |
594 | goto out; | |
595 | } | |
596 | ||
597 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
598 | { | |
599 | int rc = -ENOBUFS; | |
1d67e650 ACM |
600 | struct llc_sock *llc = llc_sk(sk); |
601 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
602 | |
603 | if (nskb) { | |
604 | u8 f_bit = 0; | |
1da177e4 LT |
605 | struct llc_sap *sap = llc->sap; |
606 | ||
1da177e4 LT |
607 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
608 | llc->daddr.lsap, LLC_PDU_RSP); | |
609 | llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR); | |
610 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
611 | if (rc) | |
612 | goto free; | |
613 | llc_conn_send_pdu(sk, nskb); | |
614 | } | |
615 | out: | |
616 | return rc; | |
617 | free: | |
618 | kfree_skb(nskb); | |
619 | goto out; | |
620 | } | |
621 | ||
622 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
623 | { | |
624 | struct llc_sock *llc = llc_sk(sk); | |
625 | ||
626 | if (!llc->remote_busy_flag) { | |
627 | llc->remote_busy_flag = 1; | |
628 | mod_timer(&llc->busy_state_timer.timer, | |
629 | jiffies + llc->busy_state_timer.expire * HZ); | |
630 | } | |
631 | return 0; | |
632 | } | |
633 | ||
634 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
635 | { | |
636 | int rc = -ENOBUFS; | |
1d67e650 ACM |
637 | struct llc_sock *llc = llc_sk(sk); |
638 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
639 | |
640 | if (nskb) { | |
1da177e4 LT |
641 | struct llc_sap *sap = llc->sap; |
642 | ||
1da177e4 LT |
643 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
644 | llc->daddr.lsap, LLC_PDU_RSP); | |
645 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
646 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
647 | if (rc) | |
648 | goto free; | |
649 | llc_conn_send_pdu(sk, nskb); | |
650 | } | |
651 | out: | |
652 | return rc; | |
653 | free: | |
654 | kfree_skb(nskb); | |
655 | goto out; | |
656 | } | |
657 | ||
658 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
659 | { | |
660 | int rc = -ENOBUFS; | |
1d67e650 ACM |
661 | struct llc_sock *llc = llc_sk(sk); |
662 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
663 | |
664 | if (nskb) { | |
1da177e4 LT |
665 | struct llc_sap *sap = llc->sap; |
666 | ||
1da177e4 LT |
667 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
668 | llc->daddr.lsap, LLC_PDU_CMD); | |
669 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
670 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
671 | if (rc) | |
672 | goto free; | |
673 | llc_conn_send_pdu(sk, nskb); | |
674 | } | |
675 | out: | |
676 | return rc; | |
677 | free: | |
678 | kfree_skb(nskb); | |
679 | goto out; | |
680 | } | |
681 | ||
682 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
683 | { | |
684 | int rc = -ENOBUFS; | |
1d67e650 ACM |
685 | struct llc_sock *llc = llc_sk(sk); |
686 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
687 | |
688 | if (nskb) { | |
1da177e4 LT |
689 | struct llc_sap *sap = llc->sap; |
690 | u8 f_bit = 1; | |
691 | ||
1da177e4 LT |
692 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
693 | llc->daddr.lsap, LLC_PDU_RSP); | |
694 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
695 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
696 | if (rc) | |
697 | goto free; | |
698 | llc_conn_send_pdu(sk, nskb); | |
699 | } | |
700 | out: | |
701 | return rc; | |
702 | free: | |
703 | kfree_skb(nskb); | |
704 | goto out; | |
705 | } | |
706 | ||
707 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
708 | { | |
709 | int rc = -ENOBUFS; | |
1d67e650 ACM |
710 | struct llc_sock *llc = llc_sk(sk); |
711 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
712 | |
713 | if (nskb) { | |
1da177e4 LT |
714 | struct llc_sap *sap = llc->sap; |
715 | u8 f_bit = 1; | |
716 | ||
1da177e4 LT |
717 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
718 | llc->daddr.lsap, LLC_PDU_RSP); | |
719 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
720 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
721 | if (rc) | |
722 | goto free; | |
723 | llc_conn_send_pdu(sk, nskb); | |
724 | } | |
725 | out: | |
726 | return rc; | |
727 | free: | |
728 | kfree_skb(nskb); | |
729 | goto out; | |
730 | } | |
731 | ||
732 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
733 | { | |
734 | int rc = -ENOBUFS; | |
1d67e650 ACM |
735 | struct llc_sock *llc = llc_sk(sk); |
736 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
737 | |
738 | if (nskb) { | |
1da177e4 LT |
739 | struct llc_sap *sap = llc->sap; |
740 | ||
1da177e4 LT |
741 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
742 | llc->daddr.lsap, LLC_PDU_RSP); | |
743 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
744 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
745 | if (rc) | |
746 | goto free; | |
747 | llc_conn_send_pdu(sk, nskb); | |
748 | } | |
749 | out: | |
750 | return rc; | |
751 | free: | |
752 | kfree_skb(nskb); | |
753 | goto out; | |
754 | } | |
755 | ||
756 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
757 | { | |
758 | int rc = -ENOBUFS; | |
1d67e650 ACM |
759 | struct llc_sock *llc = llc_sk(sk); |
760 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
761 | |
762 | if (nskb) { | |
1da177e4 LT |
763 | struct llc_sap *sap = llc->sap; |
764 | ||
1da177e4 LT |
765 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
766 | llc->daddr.lsap, LLC_PDU_RSP); | |
767 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
768 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
769 | if (rc) | |
770 | goto free; | |
771 | llc_conn_send_pdu(sk, nskb); | |
772 | } | |
773 | out: | |
774 | return rc; | |
775 | free: | |
776 | kfree_skb(nskb); | |
777 | goto out; | |
778 | } | |
779 | ||
780 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
781 | { | |
782 | int state_changed = llc_sk(sk)->p_flag && !value; | |
783 | ||
784 | llc_sk(sk)->p_flag = value; | |
785 | ||
786 | if (state_changed) | |
787 | sk->sk_state_change(sk); | |
788 | } | |
789 | ||
790 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
791 | { | |
792 | int rc = -ENOBUFS; | |
1da177e4 | 793 | struct llc_sock *llc = llc_sk(sk); |
1d67e650 | 794 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); |
1da177e4 LT |
795 | |
796 | if (nskb) { | |
797 | struct llc_sap *sap = llc->sap; | |
798 | u8 *dmac = llc->daddr.mac; | |
799 | ||
800 | if (llc->dev->flags & IFF_LOOPBACK) | |
801 | dmac = llc->dev->dev_addr; | |
1da177e4 LT |
802 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
803 | llc->daddr.lsap, LLC_PDU_CMD); | |
804 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
805 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
806 | if (rc) | |
807 | goto free; | |
808 | llc_conn_send_pdu(sk, nskb); | |
809 | llc_conn_set_p_flag(sk, 1); | |
810 | } | |
811 | out: | |
812 | return rc; | |
813 | free: | |
814 | kfree_skb(nskb); | |
815 | goto out; | |
816 | } | |
817 | ||
818 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
819 | { | |
820 | u8 f_bit; | |
821 | int rc = -ENOBUFS; | |
1d67e650 ACM |
822 | struct llc_sock *llc = llc_sk(sk); |
823 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
824 | |
825 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
826 | if (nskb) { | |
1da177e4 LT |
827 | struct llc_sap *sap = llc->sap; |
828 | ||
829 | nskb->dev = llc->dev; | |
830 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
831 | llc->daddr.lsap, LLC_PDU_RSP); | |
832 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
833 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
834 | if (rc) | |
835 | goto free; | |
836 | llc_conn_send_pdu(sk, nskb); | |
837 | } | |
838 | out: | |
839 | return rc; | |
840 | free: | |
841 | kfree_skb(nskb); | |
842 | goto out; | |
843 | } | |
844 | ||
845 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
846 | { | |
847 | llc_sk(sk)->s_flag = 0; | |
848 | return 0; | |
849 | } | |
850 | ||
851 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
852 | { | |
853 | llc_sk(sk)->s_flag = 1; | |
854 | return 0; | |
855 | } | |
856 | ||
857 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
858 | { | |
859 | struct llc_sock *llc = llc_sk(sk); | |
860 | ||
861 | llc_conn_set_p_flag(sk, 1); | |
862 | mod_timer(&llc->pf_cycle_timer.timer, | |
863 | jiffies + llc->pf_cycle_timer.expire * HZ); | |
864 | return 0; | |
865 | } | |
866 | ||
867 | /** | |
868 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
869 | * @sk: current connection structure | |
870 | * @skb: current event | |
871 | * | |
872 | * Checks number of received PDUs which have not been acknowledged, yet, | |
873 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
874 | * sends an RR response as acknowledgement for them. Returns 0 for | |
875 | * success, 1 otherwise. | |
876 | */ | |
877 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
878 | { | |
879 | u8 pf_bit; | |
880 | struct llc_sock *llc = llc_sk(sk); | |
881 | ||
882 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
883 | llc->ack_pf |= pf_bit & 1; | |
884 | if (!llc->ack_must_be_send) { | |
885 | llc->first_pdu_Ns = llc->vR; | |
886 | llc->ack_must_be_send = 1; | |
887 | llc->ack_pf = pf_bit & 1; | |
888 | } | |
889 | if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) { | |
890 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); | |
891 | llc->ack_must_be_send = 0; | |
892 | llc->ack_pf = 0; | |
893 | llc_conn_ac_inc_npta_value(sk, skb); | |
894 | } | |
895 | return 0; | |
896 | } | |
897 | ||
898 | /** | |
899 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag | |
900 | * @sk: current connection structure | |
901 | * @skb: current event | |
902 | * | |
903 | * This action resets ack_must_be_send flag of given connection, this flag | |
904 | * indicates if there is any PDU which has not been acknowledged yet. | |
905 | * Returns 0 for success, 1 otherwise. | |
906 | */ | |
907 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) | |
908 | { | |
909 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; | |
910 | return 0; | |
911 | } | |
912 | ||
913 | /** | |
914 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs | |
915 | * @sk: current connection structure | |
916 | * @skb: current event | |
917 | * | |
918 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to | |
919 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is | |
920 | * set to one if one PDU with p-bit set to one is received. Returns 0 for | |
921 | * success, 1 otherwise. | |
922 | */ | |
923 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, | |
924 | struct sk_buff *skb) | |
925 | { | |
926 | int rc; | |
927 | struct llc_sock *llc = llc_sk(sk); | |
928 | struct llc_sap *sap = llc->sap; | |
929 | ||
930 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
931 | llc->daddr.lsap, LLC_PDU_RSP); | |
932 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); | |
933 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
934 | if (!rc) { | |
935 | llc_conn_send_pdu(sk, skb); | |
936 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
937 | } | |
938 | return rc; | |
939 | } | |
940 | ||
941 | /** | |
942 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs | |
943 | * @sk: current connection structure. | |
944 | * @skb: current event. | |
945 | * | |
946 | * This action sends an I-format PDU as acknowledge to received PDUs which | |
947 | * have not been acknowledged, yet, if there is any. By using of this | |
948 | * action number of acknowledgements decreases, this technic is called | |
949 | * piggy backing. Returns 0 for success, 1 otherwise. | |
950 | */ | |
951 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) | |
952 | { | |
953 | struct llc_sock *llc = llc_sk(sk); | |
954 | ||
955 | if (llc->ack_must_be_send) { | |
956 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); | |
957 | llc->ack_must_be_send = 0 ; | |
958 | llc->ack_pf = 0; | |
959 | } else | |
960 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | /** | |
965 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked | |
966 | * @sk: current connection structure. | |
967 | * @skb: current event. | |
968 | * | |
969 | * This action sends an RR response with f-bit set to ack_pf flag as | |
970 | * acknowledge to all received PDUs which have not been acknowledged, yet, | |
971 | * if there is any. ack_pf flag indicates if a PDU has been received with | |
972 | * p-bit set to one. Returns 0 for success, 1 otherwise. | |
973 | */ | |
974 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
975 | struct sk_buff *skb) | |
976 | { | |
977 | int rc = -ENOBUFS; | |
1d67e650 ACM |
978 | struct llc_sock *llc = llc_sk(sk); |
979 | struct sk_buff *nskb = llc_alloc_frame(llc->dev); | |
1da177e4 LT |
980 | |
981 | if (nskb) { | |
1da177e4 LT |
982 | struct llc_sap *sap = llc->sap; |
983 | ||
1da177e4 LT |
984 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
985 | llc->daddr.lsap, LLC_PDU_RSP); | |
986 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); | |
987 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
988 | if (rc) | |
989 | goto free; | |
990 | llc_conn_send_pdu(sk, nskb); | |
991 | } | |
992 | out: | |
993 | return rc; | |
994 | free: | |
995 | kfree_skb(nskb); | |
996 | goto out; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater | |
1001 | * @sk: current connection structure. | |
1002 | * @skb: current event. | |
1003 | * | |
1004 | * After "inc_cntr" times calling of this action, "npta" increase by one. | |
1005 | * this action tries to make vale of "npta" greater as possible; number of | |
1006 | * acknowledgements decreases by increasing of "npta". Returns 0 for | |
1007 | * success, 1 otherwise. | |
1008 | */ | |
1009 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) | |
1010 | { | |
1011 | struct llc_sock *llc = llc_sk(sk); | |
1012 | ||
1013 | if (!llc->inc_cntr) { | |
1014 | llc->dec_step = 0; | |
1015 | llc->dec_cntr = llc->inc_cntr = 2; | |
1016 | ++llc->npta; | |
1017 | if (llc->npta > 127) | |
1018 | llc->npta = 127 ; | |
1019 | } else | |
1020 | --llc->inc_cntr; | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one | |
1026 | * @sk: current connection structure. | |
1027 | * @skb: current event. | |
1028 | * | |
1029 | * After receiving "dec_cntr" times RR command, this action decreases | |
1030 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1031 | */ | |
1032 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) | |
1033 | { | |
1034 | struct llc_sock *llc = llc_sk(sk); | |
1035 | ||
1036 | if (!llc->connect_step && !llc->remote_busy_flag) { | |
1037 | if (!llc->dec_step) { | |
1038 | if (!llc->dec_cntr) { | |
1039 | llc->inc_cntr = llc->dec_cntr = 2; | |
1040 | if (llc->npta > 0) | |
1041 | llc->npta = llc->npta - 1; | |
1042 | } else | |
1043 | llc->dec_cntr -=1; | |
1044 | } | |
1045 | } else | |
1046 | llc->connect_step = 0 ; | |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one | |
1052 | * @sk: current connection structure. | |
1053 | * @skb: current event. | |
1054 | * | |
1055 | * After receiving "dec_cntr" times RNR command, this action decreases | |
1056 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1057 | */ | |
1058 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) | |
1059 | { | |
1060 | struct llc_sock *llc = llc_sk(sk); | |
1061 | ||
1062 | if (llc->remote_busy_flag) | |
1063 | if (!llc->dec_step) { | |
1064 | if (!llc->dec_cntr) { | |
1065 | llc->inc_cntr = llc->dec_cntr = 2; | |
1066 | if (llc->npta > 0) | |
1067 | --llc->npta; | |
1068 | } else | |
1069 | --llc->dec_cntr; | |
1070 | } | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * llc_conn_ac_dec_tx_win_size - decreases tx window size | |
1076 | * @sk: current connection structure. | |
1077 | * @skb: current event. | |
1078 | * | |
1079 | * After receiving of a REJ command or response, transmit window size is | |
1080 | * decreased by number of PDUs which are outstanding yet. Returns 0 for | |
1081 | * success, 1 otherwise. | |
1082 | */ | |
1083 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1084 | { | |
1085 | struct llc_sock *llc = llc_sk(sk); | |
1086 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); | |
1087 | ||
1088 | llc->k -= unacked_pdu; | |
1089 | if (llc->k < 2) | |
1090 | llc->k = 2; | |
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1096 | * @sk: current connection structure. | |
1097 | * @skb: current event. | |
1098 | * | |
1099 | * After receiving an RR response with f-bit set to one, transmit window | |
1100 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1101 | */ | |
1102 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1103 | { | |
1104 | struct llc_sock *llc = llc_sk(sk); | |
1105 | ||
1106 | llc->k += 1; | |
1107 | if (llc->k > 128) | |
1108 | llc->k = 128 ; | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1113 | { | |
1114 | struct llc_sock *llc = llc_sk(sk); | |
1115 | ||
1116 | del_timer(&llc->pf_cycle_timer.timer); | |
1117 | del_timer(&llc->ack_timer.timer); | |
1118 | del_timer(&llc->rej_sent_timer.timer); | |
1119 | del_timer(&llc->busy_state_timer.timer); | |
1120 | llc->ack_must_be_send = 0; | |
1121 | llc->ack_pf = 0; | |
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1126 | { | |
1127 | struct llc_sock *llc = llc_sk(sk); | |
1128 | ||
1129 | del_timer(&llc->rej_sent_timer.timer); | |
1130 | del_timer(&llc->pf_cycle_timer.timer); | |
1131 | del_timer(&llc->busy_state_timer.timer); | |
1132 | llc->ack_must_be_send = 0; | |
1133 | llc->ack_pf = 0; | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1138 | { | |
1139 | struct llc_sock *llc = llc_sk(sk); | |
1140 | ||
1141 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ); | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1146 | { | |
1147 | struct llc_sock *llc = llc_sk(sk); | |
1148 | ||
1149 | mod_timer(&llc->rej_sent_timer.timer, | |
1150 | jiffies + llc->rej_sent_timer.expire * HZ); | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, | |
1155 | struct sk_buff *skb) | |
1156 | { | |
1157 | struct llc_sock *llc = llc_sk(sk); | |
1158 | ||
1159 | if (!timer_pending(&llc->ack_timer.timer)) | |
1160 | mod_timer(&llc->ack_timer.timer, | |
1161 | jiffies + llc->ack_timer.expire * HZ); | |
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1166 | { | |
1167 | del_timer(&llc_sk(sk)->ack_timer.timer); | |
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) | |
1172 | { | |
1173 | struct llc_sock *llc = llc_sk(sk); | |
1174 | ||
1175 | del_timer(&llc->pf_cycle_timer.timer); | |
1176 | llc_conn_set_p_flag(sk, 0); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1181 | { | |
1182 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) | |
1187 | { | |
1188 | int acked; | |
1189 | u16 unacked = 0; | |
1190 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1191 | struct llc_sock *llc = llc_sk(sk); | |
1192 | ||
1193 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); | |
1194 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); | |
1195 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ | |
1196 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { | |
1197 | llc->retry_count = 0; | |
1198 | del_timer(&llc->ack_timer.timer); | |
1199 | if (llc->failed_data_req) { | |
1200 | /* already, we did not accept data from upper layer | |
1201 | * (tx_window full or unacceptable state). Now, we | |
1202 | * can send data and must inform to upper layer. | |
1203 | */ | |
1204 | llc->failed_data_req = 0; | |
1205 | llc_conn_ac_data_confirm(sk, skb); | |
1206 | } | |
1207 | if (unacked) | |
1208 | mod_timer(&llc->ack_timer.timer, | |
1209 | jiffies + llc->ack_timer.expire * HZ); | |
1210 | } else if (llc->failed_data_req) { | |
1211 | u8 f_bit; | |
1212 | ||
1213 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1214 | if (f_bit == 1) { | |
1215 | llc->failed_data_req = 0; | |
1216 | llc_conn_ac_data_confirm(sk, skb); | |
1217 | } | |
1218 | } | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) | |
1223 | { | |
1224 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1225 | ||
1226 | if (LLC_PDU_IS_RSP(pdu)) { | |
1227 | u8 f_bit; | |
1228 | ||
1229 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1230 | if (f_bit) { | |
1231 | llc_conn_set_p_flag(sk, 0); | |
1232 | llc_conn_ac_stop_p_timer(sk, skb); | |
1233 | } | |
1234 | } | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) | |
1239 | { | |
1240 | llc_sk(sk)->data_flag = 2; | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) | |
1245 | { | |
1246 | llc_sk(sk)->data_flag = 0; | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) | |
1251 | { | |
1252 | llc_sk(sk)->data_flag = 1; | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, | |
1257 | struct sk_buff *skb) | |
1258 | { | |
1259 | if (!llc_sk(sk)->data_flag) | |
1260 | llc_sk(sk)->data_flag = 1; | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) | |
1265 | { | |
1266 | llc_conn_set_p_flag(sk, 0); | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) | |
1271 | { | |
1272 | llc_conn_set_p_flag(sk, 1); | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) | |
1277 | { | |
1278 | llc_sk(sk)->remote_busy_flag = 0; | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) | |
1283 | { | |
1284 | llc_sk(sk)->cause_flag = 0; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) | |
1289 | { | |
1290 | llc_sk(sk)->cause_flag = 1; | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) | |
1295 | { | |
1296 | llc_sk(sk)->retry_count = 0; | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) | |
1301 | { | |
1302 | llc_sk(sk)->retry_count++; | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) | |
1307 | { | |
1308 | llc_sk(sk)->vR = 0; | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) | |
1313 | { | |
1314 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) | |
1319 | { | |
1320 | llc_sk(sk)->vS = 0; | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) | |
1325 | { | |
1326 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; | |
1327 | return 0; | |
1328 | } | |
1329 | ||
1330 | int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) | |
1331 | { | |
1332 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128; | |
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) | |
1337 | { | |
1338 | struct sock *sk = (struct sock *)timeout_data; | |
1339 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1340 | ||
1341 | bh_lock_sock(sk); | |
1342 | if (skb) { | |
1343 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1344 | ||
1345 | skb->sk = sk; | |
1346 | ev->type = LLC_CONN_EV_TYPE_P_TMR; | |
1347 | llc_process_tmr_ev(sk, skb); | |
1348 | } | |
1349 | bh_unlock_sock(sk); | |
1350 | } | |
1351 | ||
1352 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) | |
1353 | { | |
1354 | struct sock *sk = (struct sock *)timeout_data; | |
1355 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1356 | ||
1357 | bh_lock_sock(sk); | |
1358 | if (skb) { | |
1359 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1360 | ||
1361 | skb->sk = sk; | |
1362 | ev->type = LLC_CONN_EV_TYPE_BUSY_TMR; | |
1363 | llc_process_tmr_ev(sk, skb); | |
1364 | } | |
1365 | bh_unlock_sock(sk); | |
1366 | } | |
1367 | ||
1368 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) | |
1369 | { | |
1370 | struct sock* sk = (struct sock *)timeout_data; | |
1371 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1372 | ||
1373 | bh_lock_sock(sk); | |
1374 | if (skb) { | |
1375 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1376 | ||
1377 | skb->sk = sk; | |
1378 | ev->type = LLC_CONN_EV_TYPE_ACK_TMR; | |
1379 | llc_process_tmr_ev(sk, skb); | |
1380 | } | |
1381 | bh_unlock_sock(sk); | |
1382 | } | |
1383 | ||
1384 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) | |
1385 | { | |
1386 | struct sock *sk = (struct sock *)timeout_data; | |
1387 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1388 | ||
1389 | bh_lock_sock(sk); | |
1390 | if (skb) { | |
1391 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1392 | ||
1393 | skb->sk = sk; | |
1394 | ev->type = LLC_CONN_EV_TYPE_REJ_TMR; | |
1395 | llc_process_tmr_ev(sk, skb); | |
1396 | } | |
1397 | bh_unlock_sock(sk); | |
1398 | } | |
1399 | ||
1400 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) | |
1401 | { | |
1402 | llc_sk(sk)->X = llc_sk(sk)->vS; | |
1403 | llc_conn_ac_set_vs_nr(sk, skb); | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) | |
1408 | { | |
1409 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1410 | u8 nr = PDU_SUPV_GET_Nr(pdu); | |
1411 | ||
1412 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) | |
1413 | llc_conn_ac_set_vs_nr(sk, skb); | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * Non-standard actions; these not contained in IEEE specification; for | |
1419 | * our own usage | |
1420 | */ | |
1421 | /** | |
1422 | * llc_conn_disc - removes connection from SAP list and frees it | |
1423 | * @sk: closed connection | |
1424 | * @skb: occurred event | |
1425 | */ | |
1426 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) | |
1427 | { | |
1428 | /* FIXME: this thing seems to want to die */ | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | /** | |
1433 | * llc_conn_reset - resets connection | |
1434 | * @sk : reseting connection. | |
1435 | * @skb: occurred event. | |
1436 | * | |
1437 | * Stop all timers, empty all queues and reset all flags. | |
1438 | */ | |
1439 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) | |
1440 | { | |
1441 | llc_sk_reset(sk); | |
1442 | return 0; | |
1443 | } | |
1444 | ||
1445 | /** | |
1446 | * llc_circular_between - designates that b is between a and c or not | |
1447 | * @a: lower bound | |
1448 | * @b: element to see if is between a and b | |
1449 | * @c: upper bound | |
1450 | * | |
1451 | * This function designates that b is between a and c or not (for example, | |
1452 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 | |
1453 | * otherwise. | |
1454 | */ | |
1455 | u8 llc_circular_between(u8 a, u8 b, u8 c) | |
1456 | { | |
1457 | b = b - a; | |
1458 | c = c - a; | |
1459 | return b <= c; | |
1460 | } | |
1461 | ||
1462 | /** | |
1463 | * llc_process_tmr_ev - timer backend | |
1464 | * @sk: active connection | |
1465 | * @skb: occurred event | |
1466 | * | |
1467 | * This function is called from timer callback functions. When connection | |
1468 | * is busy (during sending a data frame) timer expiration event must be | |
1469 | * queued. Otherwise this event can be sent to connection state machine. | |
1470 | * Queued events will process by llc_backlog_rcv function after sending | |
1471 | * data frame. | |
1472 | */ | |
1473 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) | |
1474 | { | |
1475 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { | |
1476 | printk(KERN_WARNING "%s: timer called on closed connection\n", | |
1477 | __FUNCTION__); | |
1478 | kfree_skb(skb); | |
1479 | } else { | |
1480 | if (!sock_owned_by_user(sk)) | |
1481 | llc_conn_state_process(sk, skb); | |
1482 | else { | |
1483 | llc_set_backlog_type(skb, LLC_EVENT); | |
1484 | sk_add_backlog(sk, skb); | |
1485 | } | |
1486 | } | |
1487 | } |