2 * llc_c_ac.c - actions performed during connection state transition.
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.
10 * Copyright (c) 1997 by Procom Technology, Inc.
11 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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.
18 * See the GNU General Public License for more details.
20 #include <linux/netdevice.h>
21 #include <net/llc_conn.h>
22 #include <net/llc_sap.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>
30 #include "llc_output.h"
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
);
36 static int llc_conn_ac_inc_npta_value(struct sock
*sk
, struct sk_buff
*skb
);
38 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock
*sk
,
41 static int llc_conn_ac_set_p_flag_1(struct sock
*sk
, struct sk_buff
*skb
);
45 int llc_conn_ac_clear_remote_busy(struct sock
*sk
, struct sk_buff
*skb
)
47 struct llc_sock
*llc
= llc_sk(sk
);
49 if (llc
->remote_busy_flag
) {
51 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
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);
61 int llc_conn_ac_conn_ind(struct sock
*sk
, struct sk_buff
*skb
)
67 llc_pdu_decode_dsap(skb
, &dsap
);
68 sap
= llc_sap_find(dsap
);
70 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
71 struct llc_sock
*llc
= llc_sk(sk
);
73 llc_pdu_decode_sa(skb
, llc
->daddr
.mac
);
74 llc_pdu_decode_da(skb
, llc
->laddr
.mac
);
76 ev
->ind_prim
= LLC_CONN_PRIM
;
82 int llc_conn_ac_conn_confirm(struct sock
*sk
, struct sk_buff
*skb
)
84 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
86 ev
->cfm_prim
= LLC_CONN_PRIM
;
90 static int llc_conn_ac_data_confirm(struct sock
*sk
, struct sk_buff
*skb
)
92 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
94 ev
->cfm_prim
= LLC_DATA_PRIM
;
98 int llc_conn_ac_data_ind(struct sock
*sk
, struct sk_buff
*skb
)
100 llc_conn_rtn_pdu(sk
, skb
);
104 int llc_conn_ac_disc_ind(struct sock
*sk
, struct sk_buff
*skb
)
106 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
110 if (ev
->type
== LLC_CONN_EV_TYPE_PDU
) {
111 struct llc_pdu_un
*pdu
= llc_pdu_un_hdr(skb
);
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
;
127 ev
->ind_prim
= LLC_DISC_PRIM
;
132 int llc_conn_ac_disc_confirm(struct sock
*sk
, struct sk_buff
*skb
)
134 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
136 ev
->reason
= ev
->status
;
137 ev
->cfm_prim
= LLC_DISC_PRIM
;
141 int llc_conn_ac_rst_ind(struct sock
*sk
, struct sk_buff
*skb
)
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
);
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
;
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
;
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
;
175 ev
->ind_prim
= LLC_RESET_PRIM
;
180 int llc_conn_ac_rst_confirm(struct sock
*sk
, struct sk_buff
*skb
)
182 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
185 ev
->cfm_prim
= LLC_RESET_PRIM
;
189 int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock
*sk
,
192 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
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
);
201 int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock
*sk
,
204 struct llc_sock
*llc
= llc_sk(sk
);
206 if (llc
->data_flag
== 2)
207 del_timer(&llc
->rej_sent_timer
.timer
);
211 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock
*sk
, struct sk_buff
*skb
)
214 struct llc_sock
*llc
= llc_sk(sk
);
215 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
218 struct llc_sap
*sap
= llc
->sap
;
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
);
226 llc_conn_send_pdu(sk
, nskb
);
227 llc_conn_ac_set_p_flag_1(sk
, skb
);
236 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock
*sk
, struct sk_buff
*skb
)
239 struct llc_sock
*llc
= llc_sk(sk
);
240 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
243 struct llc_sap
*sap
= llc
->sap
;
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
);
253 llc_conn_send_pdu(sk
, nskb
);
262 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
265 struct llc_sock
*llc
= llc_sk(sk
);
266 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
269 struct llc_sap
*sap
= llc
->sap
;
271 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
272 llc
->daddr
.lsap
, LLC_PDU_RSP
);
273 llc_pdu_init_as_dm_rsp(nskb
, 1);
274 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
277 llc_conn_send_pdu(sk
, nskb
);
286 int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock
*sk
, struct sk_buff
*skb
)
290 struct sk_buff
*nskb
;
291 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
292 struct llc_sock
*llc
= llc_sk(sk
);
294 llc
->rx_pdu_hdr
= *((u32
*)pdu
);
295 if (LLC_PDU_IS_CMD(pdu
))
296 llc_pdu_decode_pf_bit(skb
, &f_bit
);
299 nskb
= llc_alloc_frame(llc
->dev
);
301 struct llc_sap
*sap
= llc
->sap
;
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
,
307 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
310 llc_conn_send_pdu(sk
, nskb
);
319 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock
*sk
, struct sk_buff
*skb
)
322 struct llc_sock
*llc
= llc_sk(sk
);
323 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
326 struct llc_sap
*sap
= llc
->sap
;
327 struct llc_pdu_sn
*pdu
= (struct llc_pdu_sn
*)&llc
->rx_pdu_hdr
;
329 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
330 llc
->daddr
.lsap
, LLC_PDU_RSP
);
331 llc_pdu_init_as_frmr_rsp(nskb
, pdu
, 0, llc
->vS
,
333 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
336 llc_conn_send_pdu(sk
, nskb
);
345 int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock
*sk
, struct sk_buff
*skb
)
349 struct sk_buff
*nskb
;
350 struct llc_sock
*llc
= llc_sk(sk
);
352 llc_pdu_decode_pf_bit(skb
, &f_bit
);
353 nskb
= llc_alloc_frame(llc
->dev
);
355 struct llc_sap
*sap
= llc
->sap
;
356 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
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
,
362 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
365 llc_conn_send_pdu(sk
, nskb
);
374 int llc_conn_ac_send_i_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
377 struct llc_sock
*llc
= llc_sk(sk
);
378 struct llc_sap
*sap
= llc
->sap
;
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
);
385 llc_conn_send_pdu(sk
, skb
);
386 llc_conn_ac_inc_vs_by_1(sk
, skb
);
391 static int llc_conn_ac_send_i_cmd_p_set_0(struct sock
*sk
, struct sk_buff
*skb
)
394 struct llc_sock
*llc
= llc_sk(sk
);
395 struct llc_sap
*sap
= llc
->sap
;
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
);
402 llc_conn_send_pdu(sk
, skb
);
403 llc_conn_ac_inc_vs_by_1(sk
, skb
);
408 int llc_conn_ac_send_i_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
411 struct llc_sock
*llc
= llc_sk(sk
);
412 struct llc_sap
*sap
= llc
->sap
;
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
);
419 llc_conn_send_pdu(sk
, skb
);
420 llc_conn_ac_inc_vs_by_1(sk
, skb
);
425 int llc_conn_ac_resend_i_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
427 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
428 u8 nr
= LLC_I_GET_NR(pdu
);
430 llc_conn_resend_i_pdu_as_cmd(sk
, nr
, 0);
434 int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock
*sk
,
438 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
440 struct llc_sock
*llc
= llc_sk(sk
);
441 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
444 struct llc_sap
*sap
= llc
->sap
;
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
);
451 llc_conn_send_pdu(sk
, nskb
);
456 nr
= LLC_I_GET_NR(pdu
);
458 llc_conn_resend_i_pdu_as_cmd(sk
, nr
, 0);
463 int llc_conn_ac_resend_i_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
465 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
466 u8 nr
= LLC_I_GET_NR(pdu
);
468 llc_conn_resend_i_pdu_as_rsp(sk
, nr
, 1);
472 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
475 struct llc_sock
*llc
= llc_sk(sk
);
476 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
479 struct llc_sap
*sap
= llc
->sap
;
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
);
487 llc_conn_send_pdu(sk
, nskb
);
496 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
499 struct llc_sock
*llc
= llc_sk(sk
);
500 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
503 struct llc_sap
*sap
= llc
->sap
;
505 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
506 llc
->daddr
.lsap
, LLC_PDU_RSP
);
507 llc_pdu_init_as_rej_rsp(nskb
, 1, llc
->vR
);
508 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
511 llc_conn_send_pdu(sk
, nskb
);
520 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
523 struct llc_sock
*llc
= llc_sk(sk
);
524 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
527 struct llc_sap
*sap
= llc
->sap
;
529 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
530 llc
->daddr
.lsap
, LLC_PDU_RSP
);
531 llc_pdu_init_as_rej_rsp(nskb
, 0, llc
->vR
);
532 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
535 llc_conn_send_pdu(sk
, nskb
);
544 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
547 struct llc_sock
*llc
= llc_sk(sk
);
548 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
551 struct llc_sap
*sap
= llc
->sap
;
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
);
559 llc_conn_send_pdu(sk
, nskb
);
568 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
571 struct llc_sock
*llc
= llc_sk(sk
);
572 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
575 struct llc_sap
*sap
= llc
->sap
;
577 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
578 llc
->daddr
.lsap
, LLC_PDU_RSP
);
579 llc_pdu_init_as_rnr_rsp(nskb
, 1, llc
->vR
);
580 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
583 llc_conn_send_pdu(sk
, nskb
);
592 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
595 struct llc_sock
*llc
= llc_sk(sk
);
596 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
599 struct llc_sap
*sap
= llc
->sap
;
601 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
602 llc
->daddr
.lsap
, LLC_PDU_RSP
);
603 llc_pdu_init_as_rnr_rsp(nskb
, 0, llc
->vR
);
604 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
607 llc_conn_send_pdu(sk
, nskb
);
616 int llc_conn_ac_set_remote_busy(struct sock
*sk
, struct sk_buff
*skb
)
618 struct llc_sock
*llc
= llc_sk(sk
);
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
);
628 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
631 struct llc_sock
*llc
= llc_sk(sk
);
632 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
635 struct llc_sap
*sap
= llc
->sap
;
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
);
643 llc_conn_send_pdu(sk
, nskb
);
652 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
655 struct llc_sock
*llc
= llc_sk(sk
);
656 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
659 struct llc_sap
*sap
= llc
->sap
;
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
);
667 llc_conn_send_pdu(sk
, nskb
);
676 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
679 struct llc_sock
*llc
= llc_sk(sk
);
680 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
683 struct llc_sap
*sap
= llc
->sap
;
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
);
692 llc_conn_send_pdu(sk
, nskb
);
701 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
704 struct llc_sock
*llc
= llc_sk(sk
);
705 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
708 struct llc_sap
*sap
= llc
->sap
;
710 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
711 llc
->daddr
.lsap
, LLC_PDU_RSP
);
712 llc_pdu_init_as_rr_rsp(nskb
, 1, llc
->vR
);
713 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
716 llc_conn_send_pdu(sk
, nskb
);
725 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
728 struct llc_sock
*llc
= llc_sk(sk
);
729 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
732 struct llc_sap
*sap
= llc
->sap
;
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
);
740 llc_conn_send_pdu(sk
, nskb
);
749 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
752 struct llc_sock
*llc
= llc_sk(sk
);
753 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
756 struct llc_sap
*sap
= llc
->sap
;
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
);
764 llc_conn_send_pdu(sk
, nskb
);
773 void llc_conn_set_p_flag(struct sock
*sk
, u8 value
)
775 int state_changed
= llc_sk(sk
)->p_flag
&& !value
;
777 llc_sk(sk
)->p_flag
= value
;
780 sk
->sk_state_change(sk
);
783 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock
*sk
, struct sk_buff
*skb
)
786 struct llc_sock
*llc
= llc_sk(sk
);
787 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
790 struct llc_sap
*sap
= llc
->sap
;
791 u8
*dmac
= llc
->daddr
.mac
;
793 if (llc
->dev
->flags
& IFF_LOOPBACK
)
794 dmac
= llc
->dev
->dev_addr
;
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
);
801 llc_conn_send_pdu(sk
, nskb
);
802 llc_conn_set_p_flag(sk
, 1);
811 int llc_conn_ac_send_ua_rsp_f_set_p(struct sock
*sk
, struct sk_buff
*skb
)
815 struct llc_sock
*llc
= llc_sk(sk
);
816 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
818 llc_pdu_decode_pf_bit(skb
, &f_bit
);
820 struct llc_sap
*sap
= llc
->sap
;
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
);
829 llc_conn_send_pdu(sk
, nskb
);
838 int llc_conn_ac_set_s_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
840 llc_sk(sk
)->s_flag
= 0;
844 int llc_conn_ac_set_s_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
846 llc_sk(sk
)->s_flag
= 1;
850 int llc_conn_ac_start_p_timer(struct sock
*sk
, struct sk_buff
*skb
)
852 struct llc_sock
*llc
= llc_sk(sk
);
854 llc_conn_set_p_flag(sk
, 1);
855 mod_timer(&llc
->pf_cycle_timer
.timer
,
856 jiffies
+ llc
->pf_cycle_timer
.expire
);
861 * llc_conn_ac_send_ack_if_needed - check if ack is needed
862 * @sk: current connection structure
863 * @skb: current event
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.
870 int llc_conn_ac_send_ack_if_needed(struct sock
*sk
, struct sk_buff
*skb
)
873 struct llc_sock
*llc
= llc_sk(sk
);
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;
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;
886 llc_conn_ac_inc_npta_value(sk
, skb
);
892 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
893 * @sk: current connection structure
894 * @skb: current event
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.
900 int llc_conn_ac_rst_sendack_flag(struct sock
*sk
, struct sk_buff
*skb
)
902 llc_sk(sk
)->ack_must_be_send
= llc_sk(sk
)->ack_pf
= 0;
907 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
908 * @sk: current connection structure
909 * @skb: current event
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.
916 static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock
*sk
,
920 struct llc_sock
*llc
= llc_sk(sk
);
921 struct llc_sap
*sap
= llc
->sap
;
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
);
928 llc_conn_send_pdu(sk
, skb
);
929 llc_conn_ac_inc_vs_by_1(sk
, skb
);
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.
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.
944 int llc_conn_ac_send_i_as_ack(struct sock
*sk
, struct sk_buff
*skb
)
946 struct llc_sock
*llc
= llc_sk(sk
);
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 ;
953 llc_conn_ac_send_i_cmd_p_set_0(sk
, skb
);
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.
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.
967 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock
*sk
,
971 struct llc_sock
*llc
= llc_sk(sk
);
972 struct sk_buff
*nskb
= llc_alloc_frame(llc
->dev
);
975 struct llc_sap
*sap
= llc
->sap
;
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
);
983 llc_conn_send_pdu(sk
, nskb
);
993 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
994 * @sk: current connection structure.
995 * @skb: current event.
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.
1002 static int llc_conn_ac_inc_npta_value(struct sock
*sk
, struct sk_buff
*skb
)
1004 struct llc_sock
*llc
= llc_sk(sk
);
1006 if (!llc
->inc_cntr
) {
1008 llc
->dec_cntr
= llc
->inc_cntr
= 2;
1010 if (llc
->npta
> 127)
1018 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1019 * @sk: current connection structure.
1020 * @skb: current event.
1022 * After receiving "dec_cntr" times RR command, this action decreases
1023 * "npta" by one. Returns 0 for success, 1 otherwise.
1025 int llc_conn_ac_adjust_npta_by_rr(struct sock
*sk
, struct sk_buff
*skb
)
1027 struct llc_sock
*llc
= llc_sk(sk
);
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;
1034 llc
->npta
= llc
->npta
- 1;
1039 llc
->connect_step
= 0 ;
1044 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1045 * @sk: current connection structure.
1046 * @skb: current event.
1048 * After receiving "dec_cntr" times RNR command, this action decreases
1049 * "npta" by one. Returns 0 for success, 1 otherwise.
1051 int llc_conn_ac_adjust_npta_by_rnr(struct sock
*sk
, struct sk_buff
*skb
)
1053 struct llc_sock
*llc
= llc_sk(sk
);
1055 if (llc
->remote_busy_flag
)
1056 if (!llc
->dec_step
) {
1057 if (!llc
->dec_cntr
) {
1058 llc
->inc_cntr
= llc
->dec_cntr
= 2;
1068 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1069 * @sk: current connection structure.
1070 * @skb: current event.
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.
1076 int llc_conn_ac_dec_tx_win_size(struct sock
*sk
, struct sk_buff
*skb
)
1078 struct llc_sock
*llc
= llc_sk(sk
);
1079 u8 unacked_pdu
= skb_queue_len(&llc
->pdu_unack_q
);
1081 llc
->k
-= unacked_pdu
;
1088 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1089 * @sk: current connection structure.
1090 * @skb: current event.
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.
1095 int llc_conn_ac_inc_tx_win_size(struct sock
*sk
, struct sk_buff
*skb
)
1097 struct llc_sock
*llc
= llc_sk(sk
);
1105 int llc_conn_ac_stop_all_timers(struct sock
*sk
, struct sk_buff
*skb
)
1107 struct llc_sock
*llc
= llc_sk(sk
);
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;
1118 int llc_conn_ac_stop_other_timers(struct sock
*sk
, struct sk_buff
*skb
)
1120 struct llc_sock
*llc
= llc_sk(sk
);
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;
1130 int llc_conn_ac_start_ack_timer(struct sock
*sk
, struct sk_buff
*skb
)
1132 struct llc_sock
*llc
= llc_sk(sk
);
1134 mod_timer(&llc
->ack_timer
.timer
, jiffies
+ llc
->ack_timer
.expire
);
1138 int llc_conn_ac_start_rej_timer(struct sock
*sk
, struct sk_buff
*skb
)
1140 struct llc_sock
*llc
= llc_sk(sk
);
1142 mod_timer(&llc
->rej_sent_timer
.timer
,
1143 jiffies
+ llc
->rej_sent_timer
.expire
);
1147 int llc_conn_ac_start_ack_tmr_if_not_running(struct sock
*sk
,
1148 struct sk_buff
*skb
)
1150 struct llc_sock
*llc
= llc_sk(sk
);
1152 if (!timer_pending(&llc
->ack_timer
.timer
))
1153 mod_timer(&llc
->ack_timer
.timer
,
1154 jiffies
+ llc
->ack_timer
.expire
);
1158 int llc_conn_ac_stop_ack_timer(struct sock
*sk
, struct sk_buff
*skb
)
1160 del_timer(&llc_sk(sk
)->ack_timer
.timer
);
1164 int llc_conn_ac_stop_p_timer(struct sock
*sk
, struct sk_buff
*skb
)
1166 struct llc_sock
*llc
= llc_sk(sk
);
1168 del_timer(&llc
->pf_cycle_timer
.timer
);
1169 llc_conn_set_p_flag(sk
, 0);
1173 int llc_conn_ac_stop_rej_timer(struct sock
*sk
, struct sk_buff
*skb
)
1175 del_timer(&llc_sk(sk
)->rej_sent_timer
.timer
);
1179 int llc_conn_ac_upd_nr_received(struct sock
*sk
, struct sk_buff
*skb
)
1183 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
1184 struct llc_sock
*llc
= llc_sk(sk
);
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.
1197 llc
->failed_data_req
= 0;
1198 llc_conn_ac_data_confirm(sk
, skb
);
1201 mod_timer(&llc
->ack_timer
.timer
,
1202 jiffies
+ llc
->ack_timer
.expire
);
1203 } else if (llc
->failed_data_req
) {
1206 llc_pdu_decode_pf_bit(skb
, &f_bit
);
1208 llc
->failed_data_req
= 0;
1209 llc_conn_ac_data_confirm(sk
, skb
);
1215 int llc_conn_ac_upd_p_flag(struct sock
*sk
, struct sk_buff
*skb
)
1217 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
1219 if (LLC_PDU_IS_RSP(pdu
)) {
1222 llc_pdu_decode_pf_bit(skb
, &f_bit
);
1224 llc_conn_set_p_flag(sk
, 0);
1225 llc_conn_ac_stop_p_timer(sk
, skb
);
1231 int llc_conn_ac_set_data_flag_2(struct sock
*sk
, struct sk_buff
*skb
)
1233 llc_sk(sk
)->data_flag
= 2;
1237 int llc_conn_ac_set_data_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
1239 llc_sk(sk
)->data_flag
= 0;
1243 int llc_conn_ac_set_data_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
1245 llc_sk(sk
)->data_flag
= 1;
1249 int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock
*sk
,
1250 struct sk_buff
*skb
)
1252 if (!llc_sk(sk
)->data_flag
)
1253 llc_sk(sk
)->data_flag
= 1;
1257 int llc_conn_ac_set_p_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
1259 llc_conn_set_p_flag(sk
, 0);
1263 static int llc_conn_ac_set_p_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
1265 llc_conn_set_p_flag(sk
, 1);
1269 int llc_conn_ac_set_remote_busy_0(struct sock
*sk
, struct sk_buff
*skb
)
1271 llc_sk(sk
)->remote_busy_flag
= 0;
1275 int llc_conn_ac_set_cause_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
1277 llc_sk(sk
)->cause_flag
= 0;
1281 int llc_conn_ac_set_cause_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
1283 llc_sk(sk
)->cause_flag
= 1;
1287 int llc_conn_ac_set_retry_cnt_0(struct sock
*sk
, struct sk_buff
*skb
)
1289 llc_sk(sk
)->retry_count
= 0;
1293 int llc_conn_ac_inc_retry_cnt_by_1(struct sock
*sk
, struct sk_buff
*skb
)
1295 llc_sk(sk
)->retry_count
++;
1299 int llc_conn_ac_set_vr_0(struct sock
*sk
, struct sk_buff
*skb
)
1305 int llc_conn_ac_inc_vr_by_1(struct sock
*sk
, struct sk_buff
*skb
)
1307 llc_sk(sk
)->vR
= PDU_GET_NEXT_Vr(llc_sk(sk
)->vR
);
1311 int llc_conn_ac_set_vs_0(struct sock
*sk
, struct sk_buff
*skb
)
1317 int llc_conn_ac_set_vs_nr(struct sock
*sk
, struct sk_buff
*skb
)
1319 llc_sk(sk
)->vS
= llc_sk(sk
)->last_nr
;
1323 int llc_conn_ac_inc_vs_by_1(struct sock
*sk
, struct sk_buff
*skb
)
1325 llc_sk(sk
)->vS
= (llc_sk(sk
)->vS
+ 1) % 128;
1329 static void llc_conn_tmr_common_cb(unsigned long timeout_data
, u8 type
)
1331 struct sock
*sk
= (struct sock
*)timeout_data
;
1332 struct sk_buff
*skb
= alloc_skb(0, GFP_ATOMIC
);
1336 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
1340 llc_process_tmr_ev(sk
, skb
);
1345 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data
)
1347 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_P_TMR
);
1350 void llc_conn_busy_tmr_cb(unsigned long timeout_data
)
1352 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_BUSY_TMR
);
1355 void llc_conn_ack_tmr_cb(unsigned long timeout_data
)
1357 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_ACK_TMR
);
1360 void llc_conn_rej_tmr_cb(unsigned long timeout_data
)
1362 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_REJ_TMR
);
1365 int llc_conn_ac_rst_vs(struct sock
*sk
, struct sk_buff
*skb
)
1367 llc_sk(sk
)->X
= llc_sk(sk
)->vS
;
1368 llc_conn_ac_set_vs_nr(sk
, skb
);
1372 int llc_conn_ac_upd_vs(struct sock
*sk
, struct sk_buff
*skb
)
1374 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
1375 u8 nr
= PDU_SUPV_GET_Nr(pdu
);
1377 if (llc_circular_between(llc_sk(sk
)->vS
, nr
, llc_sk(sk
)->X
))
1378 llc_conn_ac_set_vs_nr(sk
, skb
);
1383 * Non-standard actions; these not contained in IEEE specification; for
1387 * llc_conn_disc - removes connection from SAP list and frees it
1388 * @sk: closed connection
1389 * @skb: occurred event
1391 int llc_conn_disc(struct sock
*sk
, struct sk_buff
*skb
)
1393 /* FIXME: this thing seems to want to die */
1398 * llc_conn_reset - resets connection
1399 * @sk : reseting connection.
1400 * @skb: occurred event.
1402 * Stop all timers, empty all queues and reset all flags.
1404 int llc_conn_reset(struct sock
*sk
, struct sk_buff
*skb
)
1411 * llc_circular_between - designates that b is between a and c or not
1413 * @b: element to see if is between a and b
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
1420 u8
llc_circular_between(u8 a
, u8 b
, u8 c
)
1428 * llc_process_tmr_ev - timer backend
1429 * @sk: active connection
1430 * @skb: occurred event
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
1438 static void llc_process_tmr_ev(struct sock
*sk
, struct sk_buff
*skb
)
1440 if (llc_sk(sk
)->state
== LLC_CONN_OUT_OF_SVC
) {
1441 printk(KERN_WARNING
"%s: timer called on closed connection\n",
1445 if (!sock_owned_by_user(sk
))
1446 llc_conn_state_process(sk
, skb
);
1448 llc_set_backlog_type(skb
, LLC_EVENT
);
1449 sk_add_backlog(sk
, skb
);