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;
129 ev->ind_prim = LLC_DISC_PRIM;
134 int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
136 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
138 ev->reason = ev->status;
139 ev->cfm_prim = LLC_DISC_PRIM;
143 int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
147 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
148 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
149 struct llc_sock *llc = llc_sk(sk);
152 case LLC_CONN_EV_TYPE_PDU:
153 if (LLC_PDU_IS_RSP(pdu) &&
154 LLC_PDU_TYPE_IS_U(pdu) &&
155 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) {
156 reason = LLC_RESET_REASON_LOCAL;
158 } else if (LLC_PDU_IS_CMD(pdu) &&
159 LLC_PDU_TYPE_IS_U(pdu) &&
160 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
161 reason = LLC_RESET_REASON_REMOTE;
168 case LLC_CONN_EV_TYPE_ACK_TMR:
169 case LLC_CONN_EV_TYPE_P_TMR:
170 case LLC_CONN_EV_TYPE_REJ_TMR:
171 case LLC_CONN_EV_TYPE_BUSY_TMR:
172 if (llc->retry_count > llc->n2) {
173 reason = LLC_RESET_REASON_LOCAL;
181 ev->ind_prim = LLC_RESET_PRIM;
186 int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
188 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
191 ev->cfm_prim = LLC_RESET_PRIM;
195 int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk,
198 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
200 if (LLC_PDU_IS_RSP(pdu) &&
201 LLC_PDU_TYPE_IS_I(pdu) &&
202 LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf)
203 llc_conn_ac_clear_remote_busy(sk, skb);
207 int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
210 struct llc_sock *llc = llc_sk(sk);
212 if (llc->data_flag == 2)
213 del_timer(&llc->rej_sent_timer.timer);
217 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
220 struct sk_buff *nskb = llc_alloc_frame();
223 struct llc_sock *llc = llc_sk(sk);
224 struct llc_sap *sap = llc->sap;
226 nskb->dev = llc->dev;
227 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
228 llc->daddr.lsap, LLC_PDU_CMD);
229 llc_pdu_init_as_disc_cmd(nskb, 1);
230 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
233 llc_conn_send_pdu(sk, nskb);
234 llc_conn_ac_set_p_flag_1(sk, skb);
243 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
246 struct sk_buff *nskb = llc_alloc_frame();
249 struct llc_sock *llc = llc_sk(sk);
250 struct llc_sap *sap = llc->sap;
253 nskb->dev = llc->dev;
254 llc_pdu_decode_pf_bit(skb, &f_bit);
255 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
256 llc->daddr.lsap, LLC_PDU_RSP);
257 llc_pdu_init_as_dm_rsp(nskb, f_bit);
258 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
261 llc_conn_send_pdu(sk, nskb);
270 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
273 struct sk_buff *nskb = llc_alloc_frame();
276 struct llc_sock *llc = llc_sk(sk);
277 struct llc_sap *sap = llc->sap;
280 nskb->dev = llc->dev;
281 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
282 llc->daddr.lsap, LLC_PDU_RSP);
283 llc_pdu_init_as_dm_rsp(nskb, f_bit);
284 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
287 llc_conn_send_pdu(sk, nskb);
296 int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
300 struct sk_buff *nskb;
301 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
302 struct llc_sock *llc = llc_sk(sk);
304 llc->rx_pdu_hdr = *((u32 *)pdu);
305 if (LLC_PDU_IS_CMD(pdu))
306 llc_pdu_decode_pf_bit(skb, &f_bit);
309 nskb = llc_alloc_frame();
311 struct llc_sap *sap = llc->sap;
313 nskb->dev = llc->dev;
314 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
315 llc->daddr.lsap, LLC_PDU_RSP);
316 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
318 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
321 llc_conn_send_pdu(sk, nskb);
330 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
333 struct sk_buff *nskb = llc_alloc_frame();
337 struct llc_sock *llc = llc_sk(sk);
338 struct llc_sap *sap = llc->sap;
339 struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
341 nskb->dev = llc->dev;
342 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
343 llc->daddr.lsap, LLC_PDU_RSP);
344 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
346 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
349 llc_conn_send_pdu(sk, nskb);
358 int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
362 struct sk_buff *nskb;
364 llc_pdu_decode_pf_bit(skb, &f_bit);
365 nskb = llc_alloc_frame();
367 struct llc_sock *llc = llc_sk(sk);
368 struct llc_sap *sap = llc->sap;
369 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
371 nskb->dev = llc->dev;
372 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
373 llc->daddr.lsap, LLC_PDU_RSP);
374 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
376 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
379 llc_conn_send_pdu(sk, nskb);
388 int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
391 struct llc_sock *llc = llc_sk(sk);
392 struct llc_sap *sap = llc->sap;
394 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
395 llc->daddr.lsap, LLC_PDU_CMD);
396 llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
397 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
399 llc_conn_send_pdu(sk, skb);
400 llc_conn_ac_inc_vs_by_1(sk, skb);
405 static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
408 struct llc_sock *llc = llc_sk(sk);
409 struct llc_sap *sap = llc->sap;
411 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
412 llc->daddr.lsap, LLC_PDU_CMD);
413 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
414 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
416 llc_conn_send_pdu(sk, skb);
417 llc_conn_ac_inc_vs_by_1(sk, skb);
422 int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
425 struct llc_sock *llc = llc_sk(sk);
426 struct llc_sap *sap = llc->sap;
428 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
429 llc->daddr.lsap, LLC_PDU_CMD);
430 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
431 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
433 llc_conn_send_pdu(sk, skb);
434 llc_conn_ac_inc_vs_by_1(sk, skb);
439 int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
441 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
442 u8 nr = LLC_I_GET_NR(pdu);
444 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
448 int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
452 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
454 struct sk_buff *nskb = llc_alloc_frame();
457 struct llc_sock *llc = llc_sk(sk);
458 struct llc_sap *sap = llc->sap;
460 nskb->dev = llc->dev;
461 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
462 llc->daddr.lsap, LLC_PDU_RSP);
463 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
464 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
466 llc_conn_send_pdu(sk, nskb);
471 nr = LLC_I_GET_NR(pdu);
473 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
478 int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
480 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
481 u8 nr = LLC_I_GET_NR(pdu);
483 llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
487 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
490 struct sk_buff *nskb = llc_alloc_frame();
493 struct llc_sock *llc = llc_sk(sk);
494 struct llc_sap *sap = llc->sap;
496 nskb->dev = llc->dev;
497 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
498 llc->daddr.lsap, LLC_PDU_CMD);
499 llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
500 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
503 llc_conn_send_pdu(sk, nskb);
512 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
515 struct sk_buff *nskb = llc_alloc_frame();
519 struct llc_sock *llc = llc_sk(sk);
520 struct llc_sap *sap = llc->sap;
522 nskb->dev = llc->dev;
523 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
524 llc->daddr.lsap, LLC_PDU_RSP);
525 llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
526 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
529 llc_conn_send_pdu(sk, nskb);
538 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
541 struct sk_buff *nskb = llc_alloc_frame();
544 struct llc_sock *llc = llc_sk(sk);
545 struct llc_sap *sap = llc->sap;
548 nskb->dev = llc->dev;
549 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
550 llc->daddr.lsap, LLC_PDU_RSP);
551 llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
552 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
555 llc_conn_send_pdu(sk, nskb);
564 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
567 struct sk_buff *nskb = llc_alloc_frame();
570 struct llc_sock *llc = llc_sk(sk);
571 struct llc_sap *sap = llc->sap;
573 nskb->dev = llc->dev;
574 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
575 llc->daddr.lsap, LLC_PDU_CMD);
576 llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
577 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
580 llc_conn_send_pdu(sk, nskb);
589 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
592 struct sk_buff *nskb = llc_alloc_frame();
595 struct llc_sock *llc = llc_sk(sk);
596 struct llc_sap *sap = llc->sap;
599 nskb->dev = llc->dev;
600 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
601 llc->daddr.lsap, LLC_PDU_RSP);
602 llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
603 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
606 llc_conn_send_pdu(sk, nskb);
615 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
618 struct sk_buff *nskb = llc_alloc_frame();
622 struct llc_sock *llc = llc_sk(sk);
623 struct llc_sap *sap = llc->sap;
625 nskb->dev = llc->dev;
626 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
627 llc->daddr.lsap, LLC_PDU_RSP);
628 llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
629 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
632 llc_conn_send_pdu(sk, nskb);
641 int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
643 struct llc_sock *llc = llc_sk(sk);
645 if (!llc->remote_busy_flag) {
646 llc->remote_busy_flag = 1;
647 mod_timer(&llc->busy_state_timer.timer,
648 jiffies + llc->busy_state_timer.expire * HZ);
653 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
656 struct sk_buff *nskb = llc_alloc_frame();
659 struct llc_sock *llc = llc_sk(sk);
660 struct llc_sap *sap = llc->sap;
662 nskb->dev = llc->dev;
663 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
664 llc->daddr.lsap, LLC_PDU_RSP);
665 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
666 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
669 llc_conn_send_pdu(sk, nskb);
678 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
681 struct sk_buff *nskb = llc_alloc_frame();
684 struct llc_sock *llc = llc_sk(sk);
685 struct llc_sap *sap = llc->sap;
687 nskb->dev = llc->dev;
688 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
689 llc->daddr.lsap, LLC_PDU_CMD);
690 llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
691 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
694 llc_conn_send_pdu(sk, nskb);
703 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
706 struct sk_buff *nskb = llc_alloc_frame();
709 struct llc_sock *llc = llc_sk(sk);
710 struct llc_sap *sap = llc->sap;
713 nskb->dev = llc->dev;
714 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
715 llc->daddr.lsap, LLC_PDU_RSP);
716 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
717 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
720 llc_conn_send_pdu(sk, nskb);
729 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
732 struct sk_buff *nskb = llc_alloc_frame();
735 struct llc_sock *llc = llc_sk(sk);
736 struct llc_sap *sap = llc->sap;
739 nskb->dev = llc->dev;
740 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
741 llc->daddr.lsap, LLC_PDU_RSP);
742 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
743 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
746 llc_conn_send_pdu(sk, nskb);
755 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
758 struct sk_buff *nskb = llc_alloc_frame();
761 struct llc_sock *llc = llc_sk(sk);
762 struct llc_sap *sap = llc->sap;
764 nskb->dev = llc->dev;
765 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
766 llc->daddr.lsap, LLC_PDU_RSP);
767 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
768 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
771 llc_conn_send_pdu(sk, nskb);
780 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
783 struct sk_buff *nskb = llc_alloc_frame();
786 struct llc_sock *llc = llc_sk(sk);
787 struct llc_sap *sap = llc->sap;
789 nskb->dev = llc->dev;
790 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
791 llc->daddr.lsap, LLC_PDU_RSP);
792 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
793 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
796 llc_conn_send_pdu(sk, nskb);
805 void llc_conn_set_p_flag(struct sock *sk, u8 value)
807 int state_changed = llc_sk(sk)->p_flag && !value;
809 llc_sk(sk)->p_flag = value;
812 sk->sk_state_change(sk);
815 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
818 struct sk_buff *nskb = llc_alloc_frame();
819 struct llc_sock *llc = llc_sk(sk);
822 struct llc_sap *sap = llc->sap;
823 u8 *dmac = llc->daddr.mac;
825 if (llc->dev->flags & IFF_LOOPBACK)
826 dmac = llc->dev->dev_addr;
827 nskb->dev = llc->dev;
828 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
829 llc->daddr.lsap, LLC_PDU_CMD);
830 llc_pdu_init_as_sabme_cmd(nskb, 1);
831 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
834 llc_conn_send_pdu(sk, nskb);
835 llc_conn_set_p_flag(sk, 1);
844 int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
848 struct sk_buff *nskb = llc_alloc_frame();
850 llc_pdu_decode_pf_bit(skb, &f_bit);
852 struct llc_sock *llc = llc_sk(sk);
853 struct llc_sap *sap = llc->sap;
855 nskb->dev = llc->dev;
856 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
857 llc->daddr.lsap, LLC_PDU_RSP);
858 llc_pdu_init_as_ua_rsp(nskb, f_bit);
859 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
862 llc_conn_send_pdu(sk, nskb);
871 int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
873 llc_sk(sk)->s_flag = 0;
877 int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
879 llc_sk(sk)->s_flag = 1;
883 int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
885 struct llc_sock *llc = llc_sk(sk);
887 llc_conn_set_p_flag(sk, 1);
888 mod_timer(&llc->pf_cycle_timer.timer,
889 jiffies + llc->pf_cycle_timer.expire * HZ);
894 * llc_conn_ac_send_ack_if_needed - check if ack is needed
895 * @sk: current connection structure
896 * @skb: current event
898 * Checks number of received PDUs which have not been acknowledged, yet,
899 * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
900 * sends an RR response as acknowledgement for them. Returns 0 for
901 * success, 1 otherwise.
903 int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
906 struct llc_sock *llc = llc_sk(sk);
908 llc_pdu_decode_pf_bit(skb, &pf_bit);
909 llc->ack_pf |= pf_bit & 1;
910 if (!llc->ack_must_be_send) {
911 llc->first_pdu_Ns = llc->vR;
912 llc->ack_must_be_send = 1;
913 llc->ack_pf = pf_bit & 1;
915 if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) {
916 llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
917 llc->ack_must_be_send = 0;
919 llc_conn_ac_inc_npta_value(sk, skb);
925 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
926 * @sk: current connection structure
927 * @skb: current event
929 * This action resets ack_must_be_send flag of given connection, this flag
930 * indicates if there is any PDU which has not been acknowledged yet.
931 * Returns 0 for success, 1 otherwise.
933 int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
935 llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
940 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
941 * @sk: current connection structure
942 * @skb: current event
944 * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
945 * all received PDUs which have not been acknowledged, yet. ack_pf flag is
946 * set to one if one PDU with p-bit set to one is received. Returns 0 for
947 * success, 1 otherwise.
949 static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
953 struct llc_sock *llc = llc_sk(sk);
954 struct llc_sap *sap = llc->sap;
956 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
957 llc->daddr.lsap, LLC_PDU_RSP);
958 llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
959 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
961 llc_conn_send_pdu(sk, skb);
962 llc_conn_ac_inc_vs_by_1(sk, skb);
968 * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
969 * @sk: current connection structure.
970 * @skb: current event.
972 * This action sends an I-format PDU as acknowledge to received PDUs which
973 * have not been acknowledged, yet, if there is any. By using of this
974 * action number of acknowledgements decreases, this technic is called
975 * piggy backing. Returns 0 for success, 1 otherwise.
977 int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
979 struct llc_sock *llc = llc_sk(sk);
981 if (llc->ack_must_be_send) {
982 llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
983 llc->ack_must_be_send = 0 ;
986 llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
991 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
992 * @sk: current connection structure.
993 * @skb: current event.
995 * This action sends an RR response with f-bit set to ack_pf flag as
996 * acknowledge to all received PDUs which have not been acknowledged, yet,
997 * if there is any. ack_pf flag indicates if a PDU has been received with
998 * p-bit set to one. Returns 0 for success, 1 otherwise.
1000 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
1001 struct sk_buff *skb)
1004 struct sk_buff *nskb = llc_alloc_frame();
1007 struct llc_sock *llc = llc_sk(sk);
1008 struct llc_sap *sap = llc->sap;
1010 nskb->dev = llc->dev;
1011 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
1012 llc->daddr.lsap, LLC_PDU_RSP);
1013 llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
1014 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
1017 llc_conn_send_pdu(sk, nskb);
1027 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
1028 * @sk: current connection structure.
1029 * @skb: current event.
1031 * After "inc_cntr" times calling of this action, "npta" increase by one.
1032 * this action tries to make vale of "npta" greater as possible; number of
1033 * acknowledgements decreases by increasing of "npta". Returns 0 for
1034 * success, 1 otherwise.
1036 static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
1038 struct llc_sock *llc = llc_sk(sk);
1040 if (!llc->inc_cntr) {
1042 llc->dec_cntr = llc->inc_cntr = 2;
1044 if (llc->npta > 127)
1052 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1053 * @sk: current connection structure.
1054 * @skb: current event.
1056 * After receiving "dec_cntr" times RR command, this action decreases
1057 * "npta" by one. Returns 0 for success, 1 otherwise.
1059 int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
1061 struct llc_sock *llc = llc_sk(sk);
1063 if (!llc->connect_step && !llc->remote_busy_flag) {
1064 if (!llc->dec_step) {
1065 if (!llc->dec_cntr) {
1066 llc->inc_cntr = llc->dec_cntr = 2;
1068 llc->npta = llc->npta - 1;
1073 llc->connect_step = 0 ;
1078 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1079 * @sk: current connection structure.
1080 * @skb: current event.
1082 * After receiving "dec_cntr" times RNR command, this action decreases
1083 * "npta" by one. Returns 0 for success, 1 otherwise.
1085 int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
1087 struct llc_sock *llc = llc_sk(sk);
1089 if (llc->remote_busy_flag)
1090 if (!llc->dec_step) {
1091 if (!llc->dec_cntr) {
1092 llc->inc_cntr = llc->dec_cntr = 2;
1102 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1103 * @sk: current connection structure.
1104 * @skb: current event.
1106 * After receiving of a REJ command or response, transmit window size is
1107 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1108 * success, 1 otherwise.
1110 int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
1112 struct llc_sock *llc = llc_sk(sk);
1113 u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
1115 llc->k -= unacked_pdu;
1122 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1123 * @sk: current connection structure.
1124 * @skb: current event.
1126 * After receiving an RR response with f-bit set to one, transmit window
1127 * size is increased by one. Returns 0 for success, 1 otherwise.
1129 int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
1131 struct llc_sock *llc = llc_sk(sk);
1139 int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
1141 struct llc_sock *llc = llc_sk(sk);
1143 del_timer(&llc->pf_cycle_timer.timer);
1144 del_timer(&llc->ack_timer.timer);
1145 del_timer(&llc->rej_sent_timer.timer);
1146 del_timer(&llc->busy_state_timer.timer);
1147 llc->ack_must_be_send = 0;
1152 int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
1154 struct llc_sock *llc = llc_sk(sk);
1156 del_timer(&llc->rej_sent_timer.timer);
1157 del_timer(&llc->pf_cycle_timer.timer);
1158 del_timer(&llc->busy_state_timer.timer);
1159 llc->ack_must_be_send = 0;
1164 int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
1166 struct llc_sock *llc = llc_sk(sk);
1168 mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ);
1172 int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
1174 struct llc_sock *llc = llc_sk(sk);
1176 mod_timer(&llc->rej_sent_timer.timer,
1177 jiffies + llc->rej_sent_timer.expire * HZ);
1181 int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
1182 struct sk_buff *skb)
1184 struct llc_sock *llc = llc_sk(sk);
1186 if (!timer_pending(&llc->ack_timer.timer))
1187 mod_timer(&llc->ack_timer.timer,
1188 jiffies + llc->ack_timer.expire * HZ);
1192 int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
1194 del_timer(&llc_sk(sk)->ack_timer.timer);
1198 int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
1200 struct llc_sock *llc = llc_sk(sk);
1202 del_timer(&llc->pf_cycle_timer.timer);
1203 llc_conn_set_p_flag(sk, 0);
1207 int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
1209 del_timer(&llc_sk(sk)->rej_sent_timer.timer);
1213 int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
1217 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1218 struct llc_sock *llc = llc_sk(sk);
1220 llc->last_nr = PDU_SUPV_GET_Nr(pdu);
1221 acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
1222 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1223 if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
1224 llc->retry_count = 0;
1225 del_timer(&llc->ack_timer.timer);
1226 if (llc->failed_data_req) {
1227 /* already, we did not accept data from upper layer
1228 * (tx_window full or unacceptable state). Now, we
1229 * can send data and must inform to upper layer.
1231 llc->failed_data_req = 0;
1232 llc_conn_ac_data_confirm(sk, skb);
1235 mod_timer(&llc->ack_timer.timer,
1236 jiffies + llc->ack_timer.expire * HZ);
1237 } else if (llc->failed_data_req) {
1240 llc_pdu_decode_pf_bit(skb, &f_bit);
1242 llc->failed_data_req = 0;
1243 llc_conn_ac_data_confirm(sk, skb);
1249 int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
1251 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1253 if (LLC_PDU_IS_RSP(pdu)) {
1256 llc_pdu_decode_pf_bit(skb, &f_bit);
1258 llc_conn_set_p_flag(sk, 0);
1259 llc_conn_ac_stop_p_timer(sk, skb);
1265 int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
1267 llc_sk(sk)->data_flag = 2;
1271 int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
1273 llc_sk(sk)->data_flag = 0;
1277 int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
1279 llc_sk(sk)->data_flag = 1;
1283 int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
1284 struct sk_buff *skb)
1286 if (!llc_sk(sk)->data_flag)
1287 llc_sk(sk)->data_flag = 1;
1291 int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
1293 llc_conn_set_p_flag(sk, 0);
1297 static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
1299 llc_conn_set_p_flag(sk, 1);
1303 int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
1305 llc_sk(sk)->remote_busy_flag = 0;
1309 int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
1311 llc_sk(sk)->cause_flag = 0;
1315 int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
1317 llc_sk(sk)->cause_flag = 1;
1321 int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
1323 llc_sk(sk)->retry_count = 0;
1327 int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
1329 llc_sk(sk)->retry_count++;
1333 int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
1339 int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
1341 llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
1345 int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
1351 int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
1353 llc_sk(sk)->vS = llc_sk(sk)->last_nr;
1357 int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
1359 llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128;
1363 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
1365 struct sock *sk = (struct sock *)timeout_data;
1366 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1370 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1373 ev->type = LLC_CONN_EV_TYPE_P_TMR;
1374 llc_process_tmr_ev(sk, skb);
1379 void llc_conn_busy_tmr_cb(unsigned long timeout_data)
1381 struct sock *sk = (struct sock *)timeout_data;
1382 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1386 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1389 ev->type = LLC_CONN_EV_TYPE_BUSY_TMR;
1390 llc_process_tmr_ev(sk, skb);
1395 void llc_conn_ack_tmr_cb(unsigned long timeout_data)
1397 struct sock* sk = (struct sock *)timeout_data;
1398 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1402 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1405 ev->type = LLC_CONN_EV_TYPE_ACK_TMR;
1406 llc_process_tmr_ev(sk, skb);
1411 void llc_conn_rej_tmr_cb(unsigned long timeout_data)
1413 struct sock *sk = (struct sock *)timeout_data;
1414 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1418 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1421 ev->type = LLC_CONN_EV_TYPE_REJ_TMR;
1422 llc_process_tmr_ev(sk, skb);
1427 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
1429 llc_sk(sk)->X = llc_sk(sk)->vS;
1430 llc_conn_ac_set_vs_nr(sk, skb);
1434 int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
1436 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1437 u8 nr = PDU_SUPV_GET_Nr(pdu);
1439 if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
1440 llc_conn_ac_set_vs_nr(sk, skb);
1445 * Non-standard actions; these not contained in IEEE specification; for
1449 * llc_conn_disc - removes connection from SAP list and frees it
1450 * @sk: closed connection
1451 * @skb: occurred event
1453 int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
1455 /* FIXME: this thing seems to want to die */
1460 * llc_conn_reset - resets connection
1461 * @sk : reseting connection.
1462 * @skb: occurred event.
1464 * Stop all timers, empty all queues and reset all flags.
1466 int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
1473 * llc_circular_between - designates that b is between a and c or not
1475 * @b: element to see if is between a and b
1478 * This function designates that b is between a and c or not (for example,
1479 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1482 u8 llc_circular_between(u8 a, u8 b, u8 c)
1490 * llc_process_tmr_ev - timer backend
1491 * @sk: active connection
1492 * @skb: occurred event
1494 * This function is called from timer callback functions. When connection
1495 * is busy (during sending a data frame) timer expiration event must be
1496 * queued. Otherwise this event can be sent to connection state machine.
1497 * Queued events will process by llc_backlog_rcv function after sending
1500 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
1502 if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
1503 printk(KERN_WARNING "%s: timer called on closed connection\n",
1507 if (!sock_owned_by_user(sk))
1508 llc_conn_state_process(sk, skb);
1510 llc_set_backlog_type(skb, LLC_EVENT);
1511 sk_add_backlog(sk, skb);