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;
83 int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
85 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
87 ev->cfm_prim = LLC_CONN_PRIM;
91 static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb)
93 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
95 ev->cfm_prim = LLC_DATA_PRIM;
99 int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb)
101 llc_conn_rtn_pdu(sk, skb);
105 int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
107 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
111 if (ev->type == LLC_CONN_EV_TYPE_PDU) {
112 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
114 if (LLC_PDU_IS_RSP(pdu) &&
115 LLC_PDU_TYPE_IS_U(pdu) &&
116 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM)
117 reason = LLC_DISC_REASON_RX_DM_RSP_PDU;
118 else if (LLC_PDU_IS_CMD(pdu) &&
119 LLC_PDU_TYPE_IS_U(pdu) &&
120 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC)
121 reason = LLC_DISC_REASON_RX_DISC_CMD_PDU;
122 } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR)
123 reason = LLC_DISC_REASON_ACK_TMR_EXP;
128 ev->ind_prim = LLC_DISC_PRIM;
133 int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
135 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
137 ev->reason = ev->status;
138 ev->cfm_prim = LLC_DISC_PRIM;
142 int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
146 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
147 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
148 struct llc_sock *llc = llc_sk(sk);
151 case LLC_CONN_EV_TYPE_PDU:
152 if (LLC_PDU_IS_RSP(pdu) &&
153 LLC_PDU_TYPE_IS_U(pdu) &&
154 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) {
155 reason = LLC_RESET_REASON_LOCAL;
157 } else if (LLC_PDU_IS_CMD(pdu) &&
158 LLC_PDU_TYPE_IS_U(pdu) &&
159 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
160 reason = LLC_RESET_REASON_REMOTE;
164 case LLC_CONN_EV_TYPE_ACK_TMR:
165 case LLC_CONN_EV_TYPE_P_TMR:
166 case LLC_CONN_EV_TYPE_REJ_TMR:
167 case LLC_CONN_EV_TYPE_BUSY_TMR:
168 if (llc->retry_count > llc->n2) {
169 reason = LLC_RESET_REASON_LOCAL;
176 ev->ind_prim = LLC_RESET_PRIM;
181 int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
183 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
186 ev->cfm_prim = LLC_RESET_PRIM;
190 int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk,
193 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
195 if (LLC_PDU_IS_RSP(pdu) &&
196 LLC_PDU_TYPE_IS_I(pdu) &&
197 LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf)
198 llc_conn_ac_clear_remote_busy(sk, skb);
202 int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
205 struct llc_sock *llc = llc_sk(sk);
207 if (llc->data_flag == 2)
208 del_timer(&llc->rej_sent_timer.timer);
212 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
215 struct llc_sock *llc = llc_sk(sk);
216 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
219 struct llc_sap *sap = llc->sap;
221 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
222 llc->daddr.lsap, LLC_PDU_CMD);
223 llc_pdu_init_as_disc_cmd(nskb, 1);
224 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
227 llc_conn_send_pdu(sk, nskb);
228 llc_conn_ac_set_p_flag_1(sk, skb);
237 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
240 struct llc_sock *llc = llc_sk(sk);
241 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
244 struct llc_sap *sap = llc->sap;
247 llc_pdu_decode_pf_bit(skb, &f_bit);
248 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
249 llc->daddr.lsap, LLC_PDU_RSP);
250 llc_pdu_init_as_dm_rsp(nskb, f_bit);
251 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
254 llc_conn_send_pdu(sk, nskb);
263 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
266 struct llc_sock *llc = llc_sk(sk);
267 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
270 struct llc_sap *sap = llc->sap;
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, 1);
275 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
278 llc_conn_send_pdu(sk, nskb);
287 int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
291 struct sk_buff *nskb;
292 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
293 struct llc_sock *llc = llc_sk(sk);
295 llc->rx_pdu_hdr = *((u32 *)pdu);
296 if (LLC_PDU_IS_CMD(pdu))
297 llc_pdu_decode_pf_bit(skb, &f_bit);
300 nskb = llc_alloc_frame(llc->dev);
302 struct llc_sap *sap = llc->sap;
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,
308 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
311 llc_conn_send_pdu(sk, nskb);
320 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
323 struct llc_sock *llc = llc_sk(sk);
324 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
327 struct llc_sap *sap = llc->sap;
328 struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
330 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
331 llc->daddr.lsap, LLC_PDU_RSP);
332 llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS,
334 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
337 llc_conn_send_pdu(sk, nskb);
346 int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
350 struct sk_buff *nskb;
351 struct llc_sock *llc = llc_sk(sk);
353 llc_pdu_decode_pf_bit(skb, &f_bit);
354 nskb = llc_alloc_frame(llc->dev);
356 struct llc_sap *sap = llc->sap;
357 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
359 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
360 llc->daddr.lsap, LLC_PDU_RSP);
361 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
363 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
366 llc_conn_send_pdu(sk, nskb);
375 int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
378 struct llc_sock *llc = llc_sk(sk);
379 struct llc_sap *sap = llc->sap;
381 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
382 llc->daddr.lsap, LLC_PDU_CMD);
383 llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
384 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
386 llc_conn_send_pdu(sk, skb);
387 llc_conn_ac_inc_vs_by_1(sk, skb);
392 static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
395 struct llc_sock *llc = llc_sk(sk);
396 struct llc_sap *sap = llc->sap;
398 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
399 llc->daddr.lsap, LLC_PDU_CMD);
400 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
401 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
403 llc_conn_send_pdu(sk, skb);
404 llc_conn_ac_inc_vs_by_1(sk, skb);
409 int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
412 struct llc_sock *llc = llc_sk(sk);
413 struct llc_sap *sap = llc->sap;
415 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
416 llc->daddr.lsap, LLC_PDU_CMD);
417 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
418 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
420 llc_conn_send_pdu(sk, skb);
421 llc_conn_ac_inc_vs_by_1(sk, skb);
426 int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
428 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
429 u8 nr = LLC_I_GET_NR(pdu);
431 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
435 int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
439 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
441 struct llc_sock *llc = llc_sk(sk);
442 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
445 struct llc_sap *sap = llc->sap;
447 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
448 llc->daddr.lsap, LLC_PDU_RSP);
449 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
450 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
452 llc_conn_send_pdu(sk, nskb);
457 nr = LLC_I_GET_NR(pdu);
459 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
464 int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
466 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
467 u8 nr = LLC_I_GET_NR(pdu);
469 llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
473 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
476 struct llc_sock *llc = llc_sk(sk);
477 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
480 struct llc_sap *sap = llc->sap;
482 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
483 llc->daddr.lsap, LLC_PDU_CMD);
484 llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
485 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
488 llc_conn_send_pdu(sk, nskb);
497 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
500 struct llc_sock *llc = llc_sk(sk);
501 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
504 struct llc_sap *sap = llc->sap;
506 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
507 llc->daddr.lsap, LLC_PDU_RSP);
508 llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR);
509 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
512 llc_conn_send_pdu(sk, nskb);
521 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
524 struct llc_sock *llc = llc_sk(sk);
525 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
528 struct llc_sap *sap = llc->sap;
530 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
531 llc->daddr.lsap, LLC_PDU_RSP);
532 llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR);
533 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
536 llc_conn_send_pdu(sk, nskb);
545 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
548 struct llc_sock *llc = llc_sk(sk);
549 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
552 struct llc_sap *sap = llc->sap;
554 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
555 llc->daddr.lsap, LLC_PDU_CMD);
556 llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
557 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
560 llc_conn_send_pdu(sk, nskb);
569 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
572 struct llc_sock *llc = llc_sk(sk);
573 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
576 struct llc_sap *sap = llc->sap;
578 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
579 llc->daddr.lsap, LLC_PDU_RSP);
580 llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR);
581 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
584 llc_conn_send_pdu(sk, nskb);
593 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
596 struct llc_sock *llc = llc_sk(sk);
597 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
600 struct llc_sap *sap = llc->sap;
602 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
603 llc->daddr.lsap, LLC_PDU_RSP);
604 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
605 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
608 llc_conn_send_pdu(sk, nskb);
617 int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
619 struct llc_sock *llc = llc_sk(sk);
621 if (!llc->remote_busy_flag) {
622 llc->remote_busy_flag = 1;
623 mod_timer(&llc->busy_state_timer.timer,
624 jiffies + llc->busy_state_timer.expire);
629 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
632 struct llc_sock *llc = llc_sk(sk);
633 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
636 struct llc_sap *sap = llc->sap;
638 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
639 llc->daddr.lsap, LLC_PDU_RSP);
640 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
641 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
644 llc_conn_send_pdu(sk, nskb);
653 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
656 struct llc_sock *llc = llc_sk(sk);
657 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
660 struct llc_sap *sap = llc->sap;
662 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
663 llc->daddr.lsap, LLC_PDU_CMD);
664 llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
665 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
668 llc_conn_send_pdu(sk, nskb);
677 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
680 struct llc_sock *llc = llc_sk(sk);
681 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
684 struct llc_sap *sap = llc->sap;
687 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
688 llc->daddr.lsap, LLC_PDU_RSP);
689 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
690 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
693 llc_conn_send_pdu(sk, nskb);
702 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
705 struct llc_sock *llc = llc_sk(sk);
706 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
709 struct llc_sap *sap = llc->sap;
711 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
712 llc->daddr.lsap, LLC_PDU_RSP);
713 llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR);
714 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
717 llc_conn_send_pdu(sk, nskb);
726 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
729 struct llc_sock *llc = llc_sk(sk);
730 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
733 struct llc_sap *sap = llc->sap;
735 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
736 llc->daddr.lsap, LLC_PDU_RSP);
737 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
738 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
741 llc_conn_send_pdu(sk, nskb);
750 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
753 struct llc_sock *llc = llc_sk(sk);
754 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
757 struct llc_sap *sap = llc->sap;
759 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
760 llc->daddr.lsap, LLC_PDU_RSP);
761 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
762 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
765 llc_conn_send_pdu(sk, nskb);
774 void llc_conn_set_p_flag(struct sock *sk, u8 value)
776 int state_changed = llc_sk(sk)->p_flag && !value;
778 llc_sk(sk)->p_flag = value;
781 sk->sk_state_change(sk);
784 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
787 struct llc_sock *llc = llc_sk(sk);
788 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
791 struct llc_sap *sap = llc->sap;
792 u8 *dmac = llc->daddr.mac;
794 if (llc->dev->flags & IFF_LOOPBACK)
795 dmac = llc->dev->dev_addr;
796 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
797 llc->daddr.lsap, LLC_PDU_CMD);
798 llc_pdu_init_as_sabme_cmd(nskb, 1);
799 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
802 llc_conn_send_pdu(sk, nskb);
803 llc_conn_set_p_flag(sk, 1);
812 int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
816 struct llc_sock *llc = llc_sk(sk);
817 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
819 llc_pdu_decode_pf_bit(skb, &f_bit);
821 struct llc_sap *sap = llc->sap;
823 nskb->dev = llc->dev;
824 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
825 llc->daddr.lsap, LLC_PDU_RSP);
826 llc_pdu_init_as_ua_rsp(nskb, f_bit);
827 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
830 llc_conn_send_pdu(sk, nskb);
839 int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
841 llc_sk(sk)->s_flag = 0;
845 int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
847 llc_sk(sk)->s_flag = 1;
851 int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
853 struct llc_sock *llc = llc_sk(sk);
855 llc_conn_set_p_flag(sk, 1);
856 mod_timer(&llc->pf_cycle_timer.timer,
857 jiffies + llc->pf_cycle_timer.expire);
862 * llc_conn_ac_send_ack_if_needed - check if ack is needed
863 * @sk: current connection structure
864 * @skb: current event
866 * Checks number of received PDUs which have not been acknowledged, yet,
867 * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
868 * sends an RR response as acknowledgement for them. Returns 0 for
869 * success, 1 otherwise.
871 int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
874 struct llc_sock *llc = llc_sk(sk);
876 llc_pdu_decode_pf_bit(skb, &pf_bit);
877 llc->ack_pf |= pf_bit & 1;
878 if (!llc->ack_must_be_send) {
879 llc->first_pdu_Ns = llc->vR;
880 llc->ack_must_be_send = 1;
881 llc->ack_pf = pf_bit & 1;
883 if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) {
884 llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
885 llc->ack_must_be_send = 0;
887 llc_conn_ac_inc_npta_value(sk, skb);
893 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
894 * @sk: current connection structure
895 * @skb: current event
897 * This action resets ack_must_be_send flag of given connection, this flag
898 * indicates if there is any PDU which has not been acknowledged yet.
899 * Returns 0 for success, 1 otherwise.
901 int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
903 llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
908 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
909 * @sk: current connection structure
910 * @skb: current event
912 * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
913 * all received PDUs which have not been acknowledged, yet. ack_pf flag is
914 * set to one if one PDU with p-bit set to one is received. Returns 0 for
915 * success, 1 otherwise.
917 static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
921 struct llc_sock *llc = llc_sk(sk);
922 struct llc_sap *sap = llc->sap;
924 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
925 llc->daddr.lsap, LLC_PDU_RSP);
926 llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
927 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
929 llc_conn_send_pdu(sk, skb);
930 llc_conn_ac_inc_vs_by_1(sk, skb);
936 * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
937 * @sk: current connection structure.
938 * @skb: current event.
940 * This action sends an I-format PDU as acknowledge to received PDUs which
941 * have not been acknowledged, yet, if there is any. By using of this
942 * action number of acknowledgements decreases, this technic is called
943 * piggy backing. Returns 0 for success, 1 otherwise.
945 int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
947 struct llc_sock *llc = llc_sk(sk);
949 if (llc->ack_must_be_send) {
950 llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
951 llc->ack_must_be_send = 0 ;
954 llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
959 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
960 * @sk: current connection structure.
961 * @skb: current event.
963 * This action sends an RR response with f-bit set to ack_pf flag as
964 * acknowledge to all received PDUs which have not been acknowledged, yet,
965 * if there is any. ack_pf flag indicates if a PDU has been received with
966 * p-bit set to one. Returns 0 for success, 1 otherwise.
968 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
972 struct llc_sock *llc = llc_sk(sk);
973 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
976 struct llc_sap *sap = llc->sap;
978 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
979 llc->daddr.lsap, LLC_PDU_RSP);
980 llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
981 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
984 llc_conn_send_pdu(sk, nskb);
994 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
995 * @sk: current connection structure.
996 * @skb: current event.
998 * After "inc_cntr" times calling of this action, "npta" increase by one.
999 * this action tries to make vale of "npta" greater as possible; number of
1000 * acknowledgements decreases by increasing of "npta". Returns 0 for
1001 * success, 1 otherwise.
1003 static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
1005 struct llc_sock *llc = llc_sk(sk);
1007 if (!llc->inc_cntr) {
1009 llc->dec_cntr = llc->inc_cntr = 2;
1011 if (llc->npta > 127)
1019 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1020 * @sk: current connection structure.
1021 * @skb: current event.
1023 * After receiving "dec_cntr" times RR command, this action decreases
1024 * "npta" by one. Returns 0 for success, 1 otherwise.
1026 int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
1028 struct llc_sock *llc = llc_sk(sk);
1030 if (!llc->connect_step && !llc->remote_busy_flag) {
1031 if (!llc->dec_step) {
1032 if (!llc->dec_cntr) {
1033 llc->inc_cntr = llc->dec_cntr = 2;
1035 llc->npta = llc->npta - 1;
1040 llc->connect_step = 0 ;
1045 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1046 * @sk: current connection structure.
1047 * @skb: current event.
1049 * After receiving "dec_cntr" times RNR command, this action decreases
1050 * "npta" by one. Returns 0 for success, 1 otherwise.
1052 int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
1054 struct llc_sock *llc = llc_sk(sk);
1056 if (llc->remote_busy_flag)
1057 if (!llc->dec_step) {
1058 if (!llc->dec_cntr) {
1059 llc->inc_cntr = llc->dec_cntr = 2;
1069 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1070 * @sk: current connection structure.
1071 * @skb: current event.
1073 * After receiving of a REJ command or response, transmit window size is
1074 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1075 * success, 1 otherwise.
1077 int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
1079 struct llc_sock *llc = llc_sk(sk);
1080 u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
1082 llc->k -= unacked_pdu;
1089 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1090 * @sk: current connection structure.
1091 * @skb: current event.
1093 * After receiving an RR response with f-bit set to one, transmit window
1094 * size is increased by one. Returns 0 for success, 1 otherwise.
1096 int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
1098 struct llc_sock *llc = llc_sk(sk);
1106 int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
1108 struct llc_sock *llc = llc_sk(sk);
1110 del_timer(&llc->pf_cycle_timer.timer);
1111 del_timer(&llc->ack_timer.timer);
1112 del_timer(&llc->rej_sent_timer.timer);
1113 del_timer(&llc->busy_state_timer.timer);
1114 llc->ack_must_be_send = 0;
1119 int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
1121 struct llc_sock *llc = llc_sk(sk);
1123 del_timer(&llc->rej_sent_timer.timer);
1124 del_timer(&llc->pf_cycle_timer.timer);
1125 del_timer(&llc->busy_state_timer.timer);
1126 llc->ack_must_be_send = 0;
1131 int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
1133 struct llc_sock *llc = llc_sk(sk);
1135 mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire);
1139 int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
1141 struct llc_sock *llc = llc_sk(sk);
1143 mod_timer(&llc->rej_sent_timer.timer,
1144 jiffies + llc->rej_sent_timer.expire);
1148 int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
1149 struct sk_buff *skb)
1151 struct llc_sock *llc = llc_sk(sk);
1153 if (!timer_pending(&llc->ack_timer.timer))
1154 mod_timer(&llc->ack_timer.timer,
1155 jiffies + llc->ack_timer.expire);
1159 int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
1161 del_timer(&llc_sk(sk)->ack_timer.timer);
1165 int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
1167 struct llc_sock *llc = llc_sk(sk);
1169 del_timer(&llc->pf_cycle_timer.timer);
1170 llc_conn_set_p_flag(sk, 0);
1174 int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
1176 del_timer(&llc_sk(sk)->rej_sent_timer.timer);
1180 int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
1184 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1185 struct llc_sock *llc = llc_sk(sk);
1187 llc->last_nr = PDU_SUPV_GET_Nr(pdu);
1188 acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
1189 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1190 if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
1191 llc->retry_count = 0;
1192 del_timer(&llc->ack_timer.timer);
1193 if (llc->failed_data_req) {
1194 /* already, we did not accept data from upper layer
1195 * (tx_window full or unacceptable state). Now, we
1196 * can send data and must inform to upper layer.
1198 llc->failed_data_req = 0;
1199 llc_conn_ac_data_confirm(sk, skb);
1202 mod_timer(&llc->ack_timer.timer,
1203 jiffies + llc->ack_timer.expire);
1204 } else if (llc->failed_data_req) {
1207 llc_pdu_decode_pf_bit(skb, &f_bit);
1209 llc->failed_data_req = 0;
1210 llc_conn_ac_data_confirm(sk, skb);
1216 int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
1218 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1220 if (LLC_PDU_IS_RSP(pdu)) {
1223 llc_pdu_decode_pf_bit(skb, &f_bit);
1225 llc_conn_set_p_flag(sk, 0);
1226 llc_conn_ac_stop_p_timer(sk, skb);
1232 int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
1234 llc_sk(sk)->data_flag = 2;
1238 int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
1240 llc_sk(sk)->data_flag = 0;
1244 int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
1246 llc_sk(sk)->data_flag = 1;
1250 int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
1251 struct sk_buff *skb)
1253 if (!llc_sk(sk)->data_flag)
1254 llc_sk(sk)->data_flag = 1;
1258 int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
1260 llc_conn_set_p_flag(sk, 0);
1264 static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
1266 llc_conn_set_p_flag(sk, 1);
1270 int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
1272 llc_sk(sk)->remote_busy_flag = 0;
1276 int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
1278 llc_sk(sk)->cause_flag = 0;
1282 int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
1284 llc_sk(sk)->cause_flag = 1;
1288 int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
1290 llc_sk(sk)->retry_count = 0;
1294 int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
1296 llc_sk(sk)->retry_count++;
1300 int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
1306 int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
1308 llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
1312 int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
1318 int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
1320 llc_sk(sk)->vS = llc_sk(sk)->last_nr;
1324 int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
1326 llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128;
1330 static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
1332 struct sock *sk = (struct sock *)timeout_data;
1333 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1337 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1339 skb_set_owner_r(skb, sk);
1341 llc_process_tmr_ev(sk, skb);
1346 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
1348 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR);
1351 void llc_conn_busy_tmr_cb(unsigned long timeout_data)
1353 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR);
1356 void llc_conn_ack_tmr_cb(unsigned long timeout_data)
1358 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR);
1361 void llc_conn_rej_tmr_cb(unsigned long timeout_data)
1363 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR);
1366 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
1368 llc_sk(sk)->X = llc_sk(sk)->vS;
1369 llc_conn_ac_set_vs_nr(sk, skb);
1373 int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
1375 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1376 u8 nr = PDU_SUPV_GET_Nr(pdu);
1378 if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
1379 llc_conn_ac_set_vs_nr(sk, skb);
1384 * Non-standard actions; these not contained in IEEE specification; for
1388 * llc_conn_disc - removes connection from SAP list and frees it
1389 * @sk: closed connection
1390 * @skb: occurred event
1392 int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
1394 /* FIXME: this thing seems to want to die */
1399 * llc_conn_reset - resets connection
1400 * @sk : reseting connection.
1401 * @skb: occurred event.
1403 * Stop all timers, empty all queues and reset all flags.
1405 int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
1412 * llc_circular_between - designates that b is between a and c or not
1414 * @b: element to see if is between a and b
1417 * This function designates that b is between a and c or not (for example,
1418 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1421 u8 llc_circular_between(u8 a, u8 b, u8 c)
1429 * llc_process_tmr_ev - timer backend
1430 * @sk: active connection
1431 * @skb: occurred event
1433 * This function is called from timer callback functions. When connection
1434 * is busy (during sending a data frame) timer expiration event must be
1435 * queued. Otherwise this event can be sent to connection state machine.
1436 * Queued events will process by llc_backlog_rcv function after sending
1439 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
1441 if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
1442 printk(KERN_WARNING "%s: timer called on closed connection\n",
1446 if (!sock_owned_by_user(sk))
1447 llc_conn_state_process(sk, skb);
1449 llc_set_backlog_type(skb, LLC_EVENT);
1450 sk_add_backlog(sk, skb);