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
)
63 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
65 ev
->ind_prim
= LLC_CONN_PRIM
;
69 int llc_conn_ac_conn_confirm(struct sock
*sk
, struct sk_buff
*skb
)
71 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
73 ev
->cfm_prim
= LLC_CONN_PRIM
;
77 static int llc_conn_ac_data_confirm(struct sock
*sk
, struct sk_buff
*skb
)
79 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
81 ev
->cfm_prim
= LLC_DATA_PRIM
;
85 int llc_conn_ac_data_ind(struct sock
*sk
, struct sk_buff
*skb
)
87 llc_conn_rtn_pdu(sk
, skb
);
91 int llc_conn_ac_disc_ind(struct sock
*sk
, struct sk_buff
*skb
)
93 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
97 if (ev
->type
== LLC_CONN_EV_TYPE_PDU
) {
98 struct llc_pdu_un
*pdu
= llc_pdu_un_hdr(skb
);
100 if (LLC_PDU_IS_RSP(pdu
) &&
101 LLC_PDU_TYPE_IS_U(pdu
) &&
102 LLC_U_PDU_RSP(pdu
) == LLC_2_PDU_RSP_DM
)
103 reason
= LLC_DISC_REASON_RX_DM_RSP_PDU
;
104 else if (LLC_PDU_IS_CMD(pdu
) &&
105 LLC_PDU_TYPE_IS_U(pdu
) &&
106 LLC_U_PDU_CMD(pdu
) == LLC_2_PDU_CMD_DISC
)
107 reason
= LLC_DISC_REASON_RX_DISC_CMD_PDU
;
108 } else if (ev
->type
== LLC_CONN_EV_TYPE_ACK_TMR
)
109 reason
= LLC_DISC_REASON_ACK_TMR_EXP
;
114 ev
->ind_prim
= LLC_DISC_PRIM
;
119 int llc_conn_ac_disc_confirm(struct sock
*sk
, struct sk_buff
*skb
)
121 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
123 ev
->reason
= ev
->status
;
124 ev
->cfm_prim
= LLC_DISC_PRIM
;
128 int llc_conn_ac_rst_ind(struct sock
*sk
, struct sk_buff
*skb
)
132 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
133 struct llc_pdu_un
*pdu
= llc_pdu_un_hdr(skb
);
134 struct llc_sock
*llc
= llc_sk(sk
);
137 case LLC_CONN_EV_TYPE_PDU
:
138 if (LLC_PDU_IS_RSP(pdu
) &&
139 LLC_PDU_TYPE_IS_U(pdu
) &&
140 LLC_U_PDU_RSP(pdu
) == LLC_2_PDU_RSP_FRMR
) {
141 reason
= LLC_RESET_REASON_LOCAL
;
143 } else if (LLC_PDU_IS_CMD(pdu
) &&
144 LLC_PDU_TYPE_IS_U(pdu
) &&
145 LLC_U_PDU_CMD(pdu
) == LLC_2_PDU_CMD_SABME
) {
146 reason
= LLC_RESET_REASON_REMOTE
;
150 case LLC_CONN_EV_TYPE_ACK_TMR
:
151 case LLC_CONN_EV_TYPE_P_TMR
:
152 case LLC_CONN_EV_TYPE_REJ_TMR
:
153 case LLC_CONN_EV_TYPE_BUSY_TMR
:
154 if (llc
->retry_count
> llc
->n2
) {
155 reason
= LLC_RESET_REASON_LOCAL
;
162 ev
->ind_prim
= LLC_RESET_PRIM
;
167 int llc_conn_ac_rst_confirm(struct sock
*sk
, struct sk_buff
*skb
)
169 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
172 ev
->cfm_prim
= LLC_RESET_PRIM
;
176 int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock
*sk
,
179 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
181 if (LLC_PDU_IS_RSP(pdu
) &&
182 LLC_PDU_TYPE_IS_I(pdu
) &&
183 LLC_I_PF_IS_1(pdu
) && llc_sk(sk
)->ack_pf
)
184 llc_conn_ac_clear_remote_busy(sk
, skb
);
188 int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock
*sk
,
191 struct llc_sock
*llc
= llc_sk(sk
);
193 if (llc
->data_flag
== 2)
194 del_timer(&llc
->rej_sent_timer
.timer
);
198 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock
*sk
, struct sk_buff
*skb
)
201 struct llc_sock
*llc
= llc_sk(sk
);
202 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
205 struct llc_sap
*sap
= llc
->sap
;
207 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
208 llc
->daddr
.lsap
, LLC_PDU_CMD
);
209 llc_pdu_init_as_disc_cmd(nskb
, 1);
210 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
213 llc_conn_send_pdu(sk
, nskb
);
214 llc_conn_ac_set_p_flag_1(sk
, skb
);
223 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock
*sk
, struct sk_buff
*skb
)
226 struct llc_sock
*llc
= llc_sk(sk
);
227 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
230 struct llc_sap
*sap
= llc
->sap
;
233 llc_pdu_decode_pf_bit(skb
, &f_bit
);
234 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
235 llc
->daddr
.lsap
, LLC_PDU_RSP
);
236 llc_pdu_init_as_dm_rsp(nskb
, f_bit
);
237 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
240 llc_conn_send_pdu(sk
, nskb
);
249 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
252 struct llc_sock
*llc
= llc_sk(sk
);
253 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
256 struct llc_sap
*sap
= llc
->sap
;
258 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
259 llc
->daddr
.lsap
, LLC_PDU_RSP
);
260 llc_pdu_init_as_dm_rsp(nskb
, 1);
261 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
264 llc_conn_send_pdu(sk
, nskb
);
273 int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock
*sk
, struct sk_buff
*skb
)
277 struct sk_buff
*nskb
;
278 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
279 struct llc_sock
*llc
= llc_sk(sk
);
281 llc
->rx_pdu_hdr
= *((u32
*)pdu
);
282 if (LLC_PDU_IS_CMD(pdu
))
283 llc_pdu_decode_pf_bit(skb
, &f_bit
);
286 nskb
= llc_alloc_frame(sk
, llc
->dev
);
288 struct llc_sap
*sap
= llc
->sap
;
290 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
291 llc
->daddr
.lsap
, LLC_PDU_RSP
);
292 llc_pdu_init_as_frmr_rsp(nskb
, pdu
, f_bit
, llc
->vS
,
294 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
297 llc_conn_send_pdu(sk
, nskb
);
306 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock
*sk
, struct sk_buff
*skb
)
309 struct llc_sock
*llc
= llc_sk(sk
);
310 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
313 struct llc_sap
*sap
= llc
->sap
;
314 struct llc_pdu_sn
*pdu
= (struct llc_pdu_sn
*)&llc
->rx_pdu_hdr
;
316 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
317 llc
->daddr
.lsap
, LLC_PDU_RSP
);
318 llc_pdu_init_as_frmr_rsp(nskb
, pdu
, 0, llc
->vS
,
320 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
323 llc_conn_send_pdu(sk
, nskb
);
332 int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock
*sk
, struct sk_buff
*skb
)
336 struct sk_buff
*nskb
;
337 struct llc_sock
*llc
= llc_sk(sk
);
339 llc_pdu_decode_pf_bit(skb
, &f_bit
);
340 nskb
= llc_alloc_frame(sk
, llc
->dev
);
342 struct llc_sap
*sap
= llc
->sap
;
343 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
345 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
346 llc
->daddr
.lsap
, LLC_PDU_RSP
);
347 llc_pdu_init_as_frmr_rsp(nskb
, pdu
, f_bit
, llc
->vS
,
349 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
352 llc_conn_send_pdu(sk
, nskb
);
361 int llc_conn_ac_send_i_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
364 struct llc_sock
*llc
= llc_sk(sk
);
365 struct llc_sap
*sap
= llc
->sap
;
367 llc_pdu_header_init(skb
, LLC_PDU_TYPE_I
, sap
->laddr
.lsap
,
368 llc
->daddr
.lsap
, LLC_PDU_CMD
);
369 llc_pdu_init_as_i_cmd(skb
, 1, llc
->vS
, llc
->vR
);
370 rc
= llc_mac_hdr_init(skb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
372 llc_conn_send_pdu(sk
, skb
);
373 llc_conn_ac_inc_vs_by_1(sk
, skb
);
378 static int llc_conn_ac_send_i_cmd_p_set_0(struct sock
*sk
, struct sk_buff
*skb
)
381 struct llc_sock
*llc
= llc_sk(sk
);
382 struct llc_sap
*sap
= llc
->sap
;
384 llc_pdu_header_init(skb
, LLC_PDU_TYPE_I
, sap
->laddr
.lsap
,
385 llc
->daddr
.lsap
, LLC_PDU_CMD
);
386 llc_pdu_init_as_i_cmd(skb
, 0, llc
->vS
, llc
->vR
);
387 rc
= llc_mac_hdr_init(skb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
389 llc_conn_send_pdu(sk
, skb
);
390 llc_conn_ac_inc_vs_by_1(sk
, skb
);
395 int llc_conn_ac_send_i_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
398 struct llc_sock
*llc
= llc_sk(sk
);
399 struct llc_sap
*sap
= llc
->sap
;
401 llc_pdu_header_init(skb
, LLC_PDU_TYPE_I
, sap
->laddr
.lsap
,
402 llc
->daddr
.lsap
, LLC_PDU_CMD
);
403 llc_pdu_init_as_i_cmd(skb
, 0, llc
->vS
, llc
->vR
);
404 rc
= llc_mac_hdr_init(skb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
406 llc_conn_send_pdu(sk
, skb
);
407 llc_conn_ac_inc_vs_by_1(sk
, skb
);
412 int llc_conn_ac_resend_i_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
414 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
415 u8 nr
= LLC_I_GET_NR(pdu
);
417 llc_conn_resend_i_pdu_as_cmd(sk
, nr
, 0);
421 int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock
*sk
,
425 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
427 struct llc_sock
*llc
= llc_sk(sk
);
428 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
431 struct llc_sap
*sap
= llc
->sap
;
433 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
434 llc
->daddr
.lsap
, LLC_PDU_RSP
);
435 llc_pdu_init_as_rr_rsp(nskb
, 0, llc
->vR
);
436 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
438 llc_conn_send_pdu(sk
, nskb
);
443 nr
= LLC_I_GET_NR(pdu
);
445 llc_conn_resend_i_pdu_as_cmd(sk
, nr
, 0);
450 int llc_conn_ac_resend_i_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
452 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
453 u8 nr
= LLC_I_GET_NR(pdu
);
455 llc_conn_resend_i_pdu_as_rsp(sk
, nr
, 1);
459 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
462 struct llc_sock
*llc
= llc_sk(sk
);
463 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
466 struct llc_sap
*sap
= llc
->sap
;
468 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
469 llc
->daddr
.lsap
, LLC_PDU_CMD
);
470 llc_pdu_init_as_rej_cmd(nskb
, 1, llc
->vR
);
471 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
474 llc_conn_send_pdu(sk
, nskb
);
483 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
486 struct llc_sock
*llc
= llc_sk(sk
);
487 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
490 struct llc_sap
*sap
= llc
->sap
;
492 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
493 llc
->daddr
.lsap
, LLC_PDU_RSP
);
494 llc_pdu_init_as_rej_rsp(nskb
, 1, llc
->vR
);
495 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
498 llc_conn_send_pdu(sk
, nskb
);
507 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
510 struct llc_sock
*llc
= llc_sk(sk
);
511 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
514 struct llc_sap
*sap
= llc
->sap
;
516 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
517 llc
->daddr
.lsap
, LLC_PDU_RSP
);
518 llc_pdu_init_as_rej_rsp(nskb
, 0, llc
->vR
);
519 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
522 llc_conn_send_pdu(sk
, nskb
);
531 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
534 struct llc_sock
*llc
= llc_sk(sk
);
535 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
538 struct llc_sap
*sap
= llc
->sap
;
540 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
541 llc
->daddr
.lsap
, LLC_PDU_CMD
);
542 llc_pdu_init_as_rnr_cmd(nskb
, 1, llc
->vR
);
543 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
546 llc_conn_send_pdu(sk
, nskb
);
555 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
558 struct llc_sock
*llc
= llc_sk(sk
);
559 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
562 struct llc_sap
*sap
= llc
->sap
;
564 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
565 llc
->daddr
.lsap
, LLC_PDU_RSP
);
566 llc_pdu_init_as_rnr_rsp(nskb
, 1, llc
->vR
);
567 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
570 llc_conn_send_pdu(sk
, nskb
);
579 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
582 struct llc_sock
*llc
= llc_sk(sk
);
583 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
586 struct llc_sap
*sap
= llc
->sap
;
588 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
589 llc
->daddr
.lsap
, LLC_PDU_RSP
);
590 llc_pdu_init_as_rnr_rsp(nskb
, 0, llc
->vR
);
591 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
594 llc_conn_send_pdu(sk
, nskb
);
603 int llc_conn_ac_set_remote_busy(struct sock
*sk
, struct sk_buff
*skb
)
605 struct llc_sock
*llc
= llc_sk(sk
);
607 if (!llc
->remote_busy_flag
) {
608 llc
->remote_busy_flag
= 1;
609 mod_timer(&llc
->busy_state_timer
.timer
,
610 jiffies
+ llc
->busy_state_timer
.expire
);
615 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
618 struct llc_sock
*llc
= llc_sk(sk
);
619 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
622 struct llc_sap
*sap
= llc
->sap
;
624 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
625 llc
->daddr
.lsap
, LLC_PDU_RSP
);
626 llc_pdu_init_as_rnr_rsp(nskb
, 0, llc
->vR
);
627 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
630 llc_conn_send_pdu(sk
, nskb
);
639 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock
*sk
, struct sk_buff
*skb
)
642 struct llc_sock
*llc
= llc_sk(sk
);
643 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
646 struct llc_sap
*sap
= llc
->sap
;
648 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
649 llc
->daddr
.lsap
, LLC_PDU_CMD
);
650 llc_pdu_init_as_rr_cmd(nskb
, 1, llc
->vR
);
651 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
654 llc_conn_send_pdu(sk
, nskb
);
663 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
666 struct llc_sock
*llc
= llc_sk(sk
);
667 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
670 struct llc_sap
*sap
= llc
->sap
;
673 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
674 llc
->daddr
.lsap
, LLC_PDU_RSP
);
675 llc_pdu_init_as_rr_rsp(nskb
, f_bit
, llc
->vR
);
676 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
679 llc_conn_send_pdu(sk
, nskb
);
688 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock
*sk
, struct sk_buff
*skb
)
691 struct llc_sock
*llc
= llc_sk(sk
);
692 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
695 struct llc_sap
*sap
= llc
->sap
;
697 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
698 llc
->daddr
.lsap
, LLC_PDU_RSP
);
699 llc_pdu_init_as_rr_rsp(nskb
, 1, llc
->vR
);
700 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
703 llc_conn_send_pdu(sk
, nskb
);
712 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
715 struct llc_sock
*llc
= llc_sk(sk
);
716 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
719 struct llc_sap
*sap
= llc
->sap
;
721 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
722 llc
->daddr
.lsap
, LLC_PDU_RSP
);
723 llc_pdu_init_as_rr_rsp(nskb
, 0, llc
->vR
);
724 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
727 llc_conn_send_pdu(sk
, nskb
);
736 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock
*sk
, struct sk_buff
*skb
)
739 struct llc_sock
*llc
= llc_sk(sk
);
740 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
743 struct llc_sap
*sap
= llc
->sap
;
745 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
746 llc
->daddr
.lsap
, LLC_PDU_RSP
);
747 llc_pdu_init_as_rr_rsp(nskb
, 0, llc
->vR
);
748 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
751 llc_conn_send_pdu(sk
, nskb
);
760 void llc_conn_set_p_flag(struct sock
*sk
, u8 value
)
762 int state_changed
= llc_sk(sk
)->p_flag
&& !value
;
764 llc_sk(sk
)->p_flag
= value
;
767 sk
->sk_state_change(sk
);
770 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock
*sk
, struct sk_buff
*skb
)
773 struct llc_sock
*llc
= llc_sk(sk
);
774 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
777 struct llc_sap
*sap
= llc
->sap
;
778 u8
*dmac
= llc
->daddr
.mac
;
780 if (llc
->dev
->flags
& IFF_LOOPBACK
)
781 dmac
= llc
->dev
->dev_addr
;
782 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
783 llc
->daddr
.lsap
, LLC_PDU_CMD
);
784 llc_pdu_init_as_sabme_cmd(nskb
, 1);
785 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, dmac
);
788 llc_conn_send_pdu(sk
, nskb
);
789 llc_conn_set_p_flag(sk
, 1);
798 int llc_conn_ac_send_ua_rsp_f_set_p(struct sock
*sk
, struct sk_buff
*skb
)
802 struct llc_sock
*llc
= llc_sk(sk
);
803 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
805 llc_pdu_decode_pf_bit(skb
, &f_bit
);
807 struct llc_sap
*sap
= llc
->sap
;
809 nskb
->dev
= llc
->dev
;
810 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
,
811 llc
->daddr
.lsap
, LLC_PDU_RSP
);
812 llc_pdu_init_as_ua_rsp(nskb
, f_bit
);
813 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
816 llc_conn_send_pdu(sk
, nskb
);
825 int llc_conn_ac_set_s_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
827 llc_sk(sk
)->s_flag
= 0;
831 int llc_conn_ac_set_s_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
833 llc_sk(sk
)->s_flag
= 1;
837 int llc_conn_ac_start_p_timer(struct sock
*sk
, struct sk_buff
*skb
)
839 struct llc_sock
*llc
= llc_sk(sk
);
841 llc_conn_set_p_flag(sk
, 1);
842 mod_timer(&llc
->pf_cycle_timer
.timer
,
843 jiffies
+ llc
->pf_cycle_timer
.expire
);
848 * llc_conn_ac_send_ack_if_needed - check if ack is needed
849 * @sk: current connection structure
850 * @skb: current event
852 * Checks number of received PDUs which have not been acknowledged, yet,
853 * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
854 * sends an RR response as acknowledgement for them. Returns 0 for
855 * success, 1 otherwise.
857 int llc_conn_ac_send_ack_if_needed(struct sock
*sk
, struct sk_buff
*skb
)
860 struct llc_sock
*llc
= llc_sk(sk
);
862 llc_pdu_decode_pf_bit(skb
, &pf_bit
);
863 llc
->ack_pf
|= pf_bit
& 1;
864 if (!llc
->ack_must_be_send
) {
865 llc
->first_pdu_Ns
= llc
->vR
;
866 llc
->ack_must_be_send
= 1;
867 llc
->ack_pf
= pf_bit
& 1;
869 if (((llc
->vR
- llc
->first_pdu_Ns
+ 129) % 128) >= llc
->npta
) {
870 llc_conn_ac_send_rr_rsp_f_set_ackpf(sk
, skb
);
871 llc
->ack_must_be_send
= 0;
873 llc_conn_ac_inc_npta_value(sk
, skb
);
879 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
880 * @sk: current connection structure
881 * @skb: current event
883 * This action resets ack_must_be_send flag of given connection, this flag
884 * indicates if there is any PDU which has not been acknowledged yet.
885 * Returns 0 for success, 1 otherwise.
887 int llc_conn_ac_rst_sendack_flag(struct sock
*sk
, struct sk_buff
*skb
)
889 llc_sk(sk
)->ack_must_be_send
= llc_sk(sk
)->ack_pf
= 0;
894 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
895 * @sk: current connection structure
896 * @skb: current event
898 * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
899 * all received PDUs which have not been acknowledged, yet. ack_pf flag is
900 * set to one if one PDU with p-bit set to one is received. Returns 0 for
901 * success, 1 otherwise.
903 static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock
*sk
,
907 struct llc_sock
*llc
= llc_sk(sk
);
908 struct llc_sap
*sap
= llc
->sap
;
910 llc_pdu_header_init(skb
, LLC_PDU_TYPE_I
, sap
->laddr
.lsap
,
911 llc
->daddr
.lsap
, LLC_PDU_RSP
);
912 llc_pdu_init_as_i_cmd(skb
, llc
->ack_pf
, llc
->vS
, llc
->vR
);
913 rc
= llc_mac_hdr_init(skb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
915 llc_conn_send_pdu(sk
, skb
);
916 llc_conn_ac_inc_vs_by_1(sk
, skb
);
922 * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
923 * @sk: current connection structure.
924 * @skb: current event.
926 * This action sends an I-format PDU as acknowledge to received PDUs which
927 * have not been acknowledged, yet, if there is any. By using of this
928 * action number of acknowledgements decreases, this technic is called
929 * piggy backing. Returns 0 for success, 1 otherwise.
931 int llc_conn_ac_send_i_as_ack(struct sock
*sk
, struct sk_buff
*skb
)
933 struct llc_sock
*llc
= llc_sk(sk
);
935 if (llc
->ack_must_be_send
) {
936 llc_conn_ac_send_i_rsp_f_set_ackpf(sk
, skb
);
937 llc
->ack_must_be_send
= 0 ;
940 llc_conn_ac_send_i_cmd_p_set_0(sk
, skb
);
945 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
946 * @sk: current connection structure.
947 * @skb: current event.
949 * This action sends an RR response with f-bit set to ack_pf flag as
950 * acknowledge to all received PDUs which have not been acknowledged, yet,
951 * if there is any. ack_pf flag indicates if a PDU has been received with
952 * p-bit set to one. Returns 0 for success, 1 otherwise.
954 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock
*sk
,
958 struct llc_sock
*llc
= llc_sk(sk
);
959 struct sk_buff
*nskb
= llc_alloc_frame(sk
, llc
->dev
);
962 struct llc_sap
*sap
= llc
->sap
;
964 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_S
, sap
->laddr
.lsap
,
965 llc
->daddr
.lsap
, LLC_PDU_RSP
);
966 llc_pdu_init_as_rr_rsp(nskb
, llc
->ack_pf
, llc
->vR
);
967 rc
= llc_mac_hdr_init(nskb
, llc
->dev
->dev_addr
, llc
->daddr
.mac
);
970 llc_conn_send_pdu(sk
, nskb
);
980 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
981 * @sk: current connection structure.
982 * @skb: current event.
984 * After "inc_cntr" times calling of this action, "npta" increase by one.
985 * this action tries to make vale of "npta" greater as possible; number of
986 * acknowledgements decreases by increasing of "npta". Returns 0 for
987 * success, 1 otherwise.
989 static int llc_conn_ac_inc_npta_value(struct sock
*sk
, struct sk_buff
*skb
)
991 struct llc_sock
*llc
= llc_sk(sk
);
993 if (!llc
->inc_cntr
) {
995 llc
->dec_cntr
= llc
->inc_cntr
= 2;
1005 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1006 * @sk: current connection structure.
1007 * @skb: current event.
1009 * After receiving "dec_cntr" times RR command, this action decreases
1010 * "npta" by one. Returns 0 for success, 1 otherwise.
1012 int llc_conn_ac_adjust_npta_by_rr(struct sock
*sk
, struct sk_buff
*skb
)
1014 struct llc_sock
*llc
= llc_sk(sk
);
1016 if (!llc
->connect_step
&& !llc
->remote_busy_flag
) {
1017 if (!llc
->dec_step
) {
1018 if (!llc
->dec_cntr
) {
1019 llc
->inc_cntr
= llc
->dec_cntr
= 2;
1021 llc
->npta
= llc
->npta
- 1;
1026 llc
->connect_step
= 0 ;
1031 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1032 * @sk: current connection structure.
1033 * @skb: current event.
1035 * After receiving "dec_cntr" times RNR command, this action decreases
1036 * "npta" by one. Returns 0 for success, 1 otherwise.
1038 int llc_conn_ac_adjust_npta_by_rnr(struct sock
*sk
, struct sk_buff
*skb
)
1040 struct llc_sock
*llc
= llc_sk(sk
);
1042 if (llc
->remote_busy_flag
)
1043 if (!llc
->dec_step
) {
1044 if (!llc
->dec_cntr
) {
1045 llc
->inc_cntr
= llc
->dec_cntr
= 2;
1055 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1056 * @sk: current connection structure.
1057 * @skb: current event.
1059 * After receiving of a REJ command or response, transmit window size is
1060 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1061 * success, 1 otherwise.
1063 int llc_conn_ac_dec_tx_win_size(struct sock
*sk
, struct sk_buff
*skb
)
1065 struct llc_sock
*llc
= llc_sk(sk
);
1066 u8 unacked_pdu
= skb_queue_len(&llc
->pdu_unack_q
);
1068 llc
->k
-= unacked_pdu
;
1075 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1076 * @sk: current connection structure.
1077 * @skb: current event.
1079 * After receiving an RR response with f-bit set to one, transmit window
1080 * size is increased by one. Returns 0 for success, 1 otherwise.
1082 int llc_conn_ac_inc_tx_win_size(struct sock
*sk
, struct sk_buff
*skb
)
1084 struct llc_sock
*llc
= llc_sk(sk
);
1092 int llc_conn_ac_stop_all_timers(struct sock
*sk
, struct sk_buff
*skb
)
1094 struct llc_sock
*llc
= llc_sk(sk
);
1096 del_timer(&llc
->pf_cycle_timer
.timer
);
1097 del_timer(&llc
->ack_timer
.timer
);
1098 del_timer(&llc
->rej_sent_timer
.timer
);
1099 del_timer(&llc
->busy_state_timer
.timer
);
1100 llc
->ack_must_be_send
= 0;
1105 int llc_conn_ac_stop_other_timers(struct sock
*sk
, struct sk_buff
*skb
)
1107 struct llc_sock
*llc
= llc_sk(sk
);
1109 del_timer(&llc
->rej_sent_timer
.timer
);
1110 del_timer(&llc
->pf_cycle_timer
.timer
);
1111 del_timer(&llc
->busy_state_timer
.timer
);
1112 llc
->ack_must_be_send
= 0;
1117 int llc_conn_ac_start_ack_timer(struct sock
*sk
, struct sk_buff
*skb
)
1119 struct llc_sock
*llc
= llc_sk(sk
);
1121 mod_timer(&llc
->ack_timer
.timer
, jiffies
+ llc
->ack_timer
.expire
);
1125 int llc_conn_ac_start_rej_timer(struct sock
*sk
, struct sk_buff
*skb
)
1127 struct llc_sock
*llc
= llc_sk(sk
);
1129 mod_timer(&llc
->rej_sent_timer
.timer
,
1130 jiffies
+ llc
->rej_sent_timer
.expire
);
1134 int llc_conn_ac_start_ack_tmr_if_not_running(struct sock
*sk
,
1135 struct sk_buff
*skb
)
1137 struct llc_sock
*llc
= llc_sk(sk
);
1139 if (!timer_pending(&llc
->ack_timer
.timer
))
1140 mod_timer(&llc
->ack_timer
.timer
,
1141 jiffies
+ llc
->ack_timer
.expire
);
1145 int llc_conn_ac_stop_ack_timer(struct sock
*sk
, struct sk_buff
*skb
)
1147 del_timer(&llc_sk(sk
)->ack_timer
.timer
);
1151 int llc_conn_ac_stop_p_timer(struct sock
*sk
, struct sk_buff
*skb
)
1153 struct llc_sock
*llc
= llc_sk(sk
);
1155 del_timer(&llc
->pf_cycle_timer
.timer
);
1156 llc_conn_set_p_flag(sk
, 0);
1160 int llc_conn_ac_stop_rej_timer(struct sock
*sk
, struct sk_buff
*skb
)
1162 del_timer(&llc_sk(sk
)->rej_sent_timer
.timer
);
1166 int llc_conn_ac_upd_nr_received(struct sock
*sk
, struct sk_buff
*skb
)
1170 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
1171 struct llc_sock
*llc
= llc_sk(sk
);
1173 llc
->last_nr
= PDU_SUPV_GET_Nr(pdu
);
1174 acked
= llc_conn_remove_acked_pdus(sk
, llc
->last_nr
, &unacked
);
1175 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1176 if (acked
> 0 || (llc
->dev
->flags
& IFF_LOOPBACK
)) {
1177 llc
->retry_count
= 0;
1178 del_timer(&llc
->ack_timer
.timer
);
1179 if (llc
->failed_data_req
) {
1180 /* already, we did not accept data from upper layer
1181 * (tx_window full or unacceptable state). Now, we
1182 * can send data and must inform to upper layer.
1184 llc
->failed_data_req
= 0;
1185 llc_conn_ac_data_confirm(sk
, skb
);
1188 mod_timer(&llc
->ack_timer
.timer
,
1189 jiffies
+ llc
->ack_timer
.expire
);
1190 } else if (llc
->failed_data_req
) {
1193 llc_pdu_decode_pf_bit(skb
, &f_bit
);
1195 llc
->failed_data_req
= 0;
1196 llc_conn_ac_data_confirm(sk
, skb
);
1202 int llc_conn_ac_upd_p_flag(struct sock
*sk
, struct sk_buff
*skb
)
1204 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
1206 if (LLC_PDU_IS_RSP(pdu
)) {
1209 llc_pdu_decode_pf_bit(skb
, &f_bit
);
1211 llc_conn_set_p_flag(sk
, 0);
1212 llc_conn_ac_stop_p_timer(sk
, skb
);
1218 int llc_conn_ac_set_data_flag_2(struct sock
*sk
, struct sk_buff
*skb
)
1220 llc_sk(sk
)->data_flag
= 2;
1224 int llc_conn_ac_set_data_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
1226 llc_sk(sk
)->data_flag
= 0;
1230 int llc_conn_ac_set_data_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
1232 llc_sk(sk
)->data_flag
= 1;
1236 int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock
*sk
,
1237 struct sk_buff
*skb
)
1239 if (!llc_sk(sk
)->data_flag
)
1240 llc_sk(sk
)->data_flag
= 1;
1244 int llc_conn_ac_set_p_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
1246 llc_conn_set_p_flag(sk
, 0);
1250 static int llc_conn_ac_set_p_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
1252 llc_conn_set_p_flag(sk
, 1);
1256 int llc_conn_ac_set_remote_busy_0(struct sock
*sk
, struct sk_buff
*skb
)
1258 llc_sk(sk
)->remote_busy_flag
= 0;
1262 int llc_conn_ac_set_cause_flag_0(struct sock
*sk
, struct sk_buff
*skb
)
1264 llc_sk(sk
)->cause_flag
= 0;
1268 int llc_conn_ac_set_cause_flag_1(struct sock
*sk
, struct sk_buff
*skb
)
1270 llc_sk(sk
)->cause_flag
= 1;
1274 int llc_conn_ac_set_retry_cnt_0(struct sock
*sk
, struct sk_buff
*skb
)
1276 llc_sk(sk
)->retry_count
= 0;
1280 int llc_conn_ac_inc_retry_cnt_by_1(struct sock
*sk
, struct sk_buff
*skb
)
1282 llc_sk(sk
)->retry_count
++;
1286 int llc_conn_ac_set_vr_0(struct sock
*sk
, struct sk_buff
*skb
)
1292 int llc_conn_ac_inc_vr_by_1(struct sock
*sk
, struct sk_buff
*skb
)
1294 llc_sk(sk
)->vR
= PDU_GET_NEXT_Vr(llc_sk(sk
)->vR
);
1298 int llc_conn_ac_set_vs_0(struct sock
*sk
, struct sk_buff
*skb
)
1304 int llc_conn_ac_set_vs_nr(struct sock
*sk
, struct sk_buff
*skb
)
1306 llc_sk(sk
)->vS
= llc_sk(sk
)->last_nr
;
1310 static int llc_conn_ac_inc_vs_by_1(struct sock
*sk
, struct sk_buff
*skb
)
1312 llc_sk(sk
)->vS
= (llc_sk(sk
)->vS
+ 1) % 128;
1316 static void llc_conn_tmr_common_cb(unsigned long timeout_data
, u8 type
)
1318 struct sock
*sk
= (struct sock
*)timeout_data
;
1319 struct sk_buff
*skb
= alloc_skb(0, GFP_ATOMIC
);
1323 struct llc_conn_state_ev
*ev
= llc_conn_ev(skb
);
1325 skb_set_owner_r(skb
, sk
);
1327 llc_process_tmr_ev(sk
, skb
);
1332 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data
)
1334 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_P_TMR
);
1337 void llc_conn_busy_tmr_cb(unsigned long timeout_data
)
1339 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_BUSY_TMR
);
1342 void llc_conn_ack_tmr_cb(unsigned long timeout_data
)
1344 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_ACK_TMR
);
1347 void llc_conn_rej_tmr_cb(unsigned long timeout_data
)
1349 llc_conn_tmr_common_cb(timeout_data
, LLC_CONN_EV_TYPE_REJ_TMR
);
1352 int llc_conn_ac_rst_vs(struct sock
*sk
, struct sk_buff
*skb
)
1354 llc_sk(sk
)->X
= llc_sk(sk
)->vS
;
1355 llc_conn_ac_set_vs_nr(sk
, skb
);
1359 int llc_conn_ac_upd_vs(struct sock
*sk
, struct sk_buff
*skb
)
1361 struct llc_pdu_sn
*pdu
= llc_pdu_sn_hdr(skb
);
1362 u8 nr
= PDU_SUPV_GET_Nr(pdu
);
1364 if (llc_circular_between(llc_sk(sk
)->vS
, nr
, llc_sk(sk
)->X
))
1365 llc_conn_ac_set_vs_nr(sk
, skb
);
1370 * Non-standard actions; these not contained in IEEE specification; for
1374 * llc_conn_disc - removes connection from SAP list and frees it
1375 * @sk: closed connection
1376 * @skb: occurred event
1378 int llc_conn_disc(struct sock
*sk
, struct sk_buff
*skb
)
1380 /* FIXME: this thing seems to want to die */
1385 * llc_conn_reset - resets connection
1386 * @sk : reseting connection.
1387 * @skb: occurred event.
1389 * Stop all timers, empty all queues and reset all flags.
1391 int llc_conn_reset(struct sock
*sk
, struct sk_buff
*skb
)
1398 * llc_circular_between - designates that b is between a and c or not
1400 * @b: element to see if is between a and b
1403 * This function designates that b is between a and c or not (for example,
1404 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1407 u8
llc_circular_between(u8 a
, u8 b
, u8 c
)
1415 * llc_process_tmr_ev - timer backend
1416 * @sk: active connection
1417 * @skb: occurred event
1419 * This function is called from timer callback functions. When connection
1420 * is busy (during sending a data frame) timer expiration event must be
1421 * queued. Otherwise this event can be sent to connection state machine.
1422 * Queued events will process by llc_backlog_rcv function after sending
1425 static void llc_process_tmr_ev(struct sock
*sk
, struct sk_buff
*skb
)
1427 if (llc_sk(sk
)->state
== LLC_CONN_OUT_OF_SVC
) {
1428 printk(KERN_WARNING
"%s: timer called on closed connection\n",
1432 if (!sock_owned_by_user(sk
))
1433 llc_conn_state_process(sk
, skb
);
1435 llc_set_backlog_type(skb
, LLC_EVENT
);
1436 sk_add_backlog(sk
, skb
);