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1515 lines
36 KiB
1515 lines
36 KiB
20 years ago
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/*
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* llc_c_ac.c - actions performed during connection state transition.
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*
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* Description:
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* Functions in this module are implementation of connection component actions
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* Details of actions can be found in IEEE-802.2 standard document.
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* All functions have one connection and one event as input argument. All of
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* them return 0 On success and 1 otherwise.
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*
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* Copyright (c) 1997 by Procom Technology, Inc.
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* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program can be redistributed or modified under the terms of the
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* GNU General Public License as published by the Free Software Foundation.
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* This program is distributed without any warranty or implied warranty
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* of merchantability or fitness for a particular purpose.
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*
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* See the GNU General Public License for more details.
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*/
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#include <linux/netdevice.h>
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#include <net/llc_conn.h>
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#include <net/llc_sap.h>
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#include <net/sock.h>
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#include <net/llc_c_ev.h>
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#include <net/llc_c_ac.h>
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#include <net/llc_c_st.h>
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#include <net/llc_pdu.h>
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#include <net/llc.h>
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#include "llc_output.h"
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static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb);
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static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb);
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static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev);
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static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb);
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static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
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struct sk_buff *skb);
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static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb);
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#define INCORRECT 0
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int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb)
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{
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struct llc_sock *llc = llc_sk(sk);
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if (llc->remote_busy_flag) {
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u8 nr;
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struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
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llc->remote_busy_flag = 0;
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del_timer(&llc->busy_state_timer.timer);
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nr = LLC_I_GET_NR(pdu);
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llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
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}
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return 0;
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}
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int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb)
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|
{
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int rc = -ENOTCONN;
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u8 dsap;
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||
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struct llc_sap *sap;
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llc_pdu_decode_dsap(skb, &dsap);
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sap = llc_sap_find(dsap);
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if (sap) {
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
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||
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struct llc_sock *llc = llc_sk(sk);
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llc_pdu_decode_sa(skb, llc->daddr.mac);
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llc_pdu_decode_da(skb, llc->laddr.mac);
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llc->dev = skb->dev;
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ev->ind_prim = LLC_CONN_PRIM;
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rc = 0;
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}
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return rc;
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}
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|
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int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
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{
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
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|
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ev->cfm_prim = LLC_CONN_PRIM;
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return 0;
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}
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static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb)
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{
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
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|
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ev->cfm_prim = LLC_DATA_PRIM;
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return 0;
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||
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}
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|
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int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb)
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{
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llc_conn_rtn_pdu(sk, skb);
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return 0;
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}
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|
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int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
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{
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
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u8 reason = 0;
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int rc = 0;
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if (ev->type == LLC_CONN_EV_TYPE_PDU) {
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
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if (LLC_PDU_IS_RSP(pdu) &&
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LLC_PDU_TYPE_IS_U(pdu) &&
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LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM)
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reason = LLC_DISC_REASON_RX_DM_RSP_PDU;
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else if (LLC_PDU_IS_CMD(pdu) &&
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LLC_PDU_TYPE_IS_U(pdu) &&
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LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC)
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reason = LLC_DISC_REASON_RX_DISC_CMD_PDU;
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} else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR)
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reason = LLC_DISC_REASON_ACK_TMR_EXP;
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else {
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||
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reason = 0;
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rc = -EINVAL;
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||
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|
}
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||
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|
if (!rc) {
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ev->reason = reason;
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ev->ind_prim = LLC_DISC_PRIM;
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}
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return rc;
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}
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||
|
|
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int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
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||
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{
|
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
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||
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|
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||
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ev->reason = ev->status;
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||
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ev->cfm_prim = LLC_DISC_PRIM;
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||
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|
return 0;
|
||
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|
}
|
||
|
|
|
||
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int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
|
||
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|
{
|
||
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|
u8 reason = 0;
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||
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|
int rc = 1;
|
||
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
||
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|
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
|
||
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struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
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switch (ev->type) {
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||
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case LLC_CONN_EV_TYPE_PDU:
|
||
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if (LLC_PDU_IS_RSP(pdu) &&
|
||
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LLC_PDU_TYPE_IS_U(pdu) &&
|
||
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LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) {
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||
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reason = LLC_RESET_REASON_LOCAL;
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||
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rc = 0;
|
||
|
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} else if (LLC_PDU_IS_CMD(pdu) &&
|
||
|
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LLC_PDU_TYPE_IS_U(pdu) &&
|
||
|
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LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
|
||
|
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reason = LLC_RESET_REASON_REMOTE;
|
||
|
|
rc = 0;
|
||
|
|
} else {
|
||
|
|
reason = 0;
|
||
|
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rc = 1;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case LLC_CONN_EV_TYPE_ACK_TMR:
|
||
|
|
case LLC_CONN_EV_TYPE_P_TMR:
|
||
|
|
case LLC_CONN_EV_TYPE_REJ_TMR:
|
||
|
|
case LLC_CONN_EV_TYPE_BUSY_TMR:
|
||
|
|
if (llc->retry_count > llc->n2) {
|
||
|
|
reason = LLC_RESET_REASON_LOCAL;
|
||
|
|
rc = 0;
|
||
|
|
} else
|
||
|
|
rc = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (!rc) {
|
||
|
|
ev->reason = reason;
|
||
|
|
ev->ind_prim = LLC_RESET_PRIM;
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
||
|
|
|
||
|
|
ev->reason = 0;
|
||
|
|
ev->cfm_prim = LLC_RESET_PRIM;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
|
||
|
|
if (LLC_PDU_IS_RSP(pdu) &&
|
||
|
|
LLC_PDU_TYPE_IS_I(pdu) &&
|
||
|
|
LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf)
|
||
|
|
llc_conn_ac_clear_remote_busy(sk, skb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (llc->data_flag == 2)
|
||
|
|
del_timer(&llc->rej_sent_timer.timer);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_disc_cmd(nskb, 1);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
llc_conn_ac_set_p_flag_1(sk, skb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 f_bit;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_dm_rsp(nskb, f_bit);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 f_bit = 1;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_dm_rsp(nskb, f_bit);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
u8 f_bit;
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb;
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
llc->rx_pdu_hdr = *((u32 *)pdu);
|
||
|
|
if (LLC_PDU_IS_CMD(pdu))
|
||
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
||
|
|
else
|
||
|
|
f_bit = 0;
|
||
|
|
nskb = llc_alloc_frame();
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
|
||
|
|
llc->vR, INCORRECT);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
u8 f_bit = 0;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
|
||
|
|
llc->vR, INCORRECT);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
u8 f_bit;
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb;
|
||
|
|
|
||
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
||
|
|
nskb = llc_alloc_frame();
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
|
||
|
|
llc->vR, INCORRECT);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (!rc) {
|
||
|
|
llc_conn_send_pdu(sk, skb);
|
||
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (!rc) {
|
||
|
|
llc_conn_send_pdu(sk, skb);
|
||
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (!rc) {
|
||
|
|
llc_conn_send_pdu(sk, skb);
|
||
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
u8 nr = LLC_I_GET_NR(pdu);
|
||
|
|
|
||
|
|
llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
u8 nr;
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (!rc)
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
else
|
||
|
|
kfree_skb(skb);
|
||
|
|
}
|
||
|
|
if (rc) {
|
||
|
|
nr = LLC_I_GET_NR(pdu);
|
||
|
|
rc = 0;
|
||
|
|
llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
u8 nr = LLC_I_GET_NR(pdu);
|
||
|
|
|
||
|
|
llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
u8 f_bit = 1;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 f_bit = 0;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 f_bit = 1;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
u8 f_bit = 0;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (!llc->remote_busy_flag) {
|
||
|
|
llc->remote_busy_flag = 1;
|
||
|
|
mod_timer(&llc->busy_state_timer.timer,
|
||
|
|
jiffies + llc->busy_state_timer.expire * HZ);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 f_bit = 1;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 f_bit = 1;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
void llc_conn_set_p_flag(struct sock *sk, u8 value)
|
||
|
|
{
|
||
|
|
int state_changed = llc_sk(sk)->p_flag && !value;
|
||
|
|
|
||
|
|
llc_sk(sk)->p_flag = value;
|
||
|
|
|
||
|
|
if (state_changed)
|
||
|
|
sk->sk_state_change(sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
u8 *dmac = llc->daddr.mac;
|
||
|
|
|
||
|
|
if (llc->dev->flags & IFF_LOOPBACK)
|
||
|
|
dmac = llc->dev->dev_addr;
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
||
|
|
llc_pdu_init_as_sabme_cmd(nskb, 1);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
llc_conn_set_p_flag(sk, 1);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
u8 f_bit;
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_ua_rsp(nskb, f_bit);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->s_flag = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->s_flag = 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
llc_conn_set_p_flag(sk, 1);
|
||
|
|
mod_timer(&llc->pf_cycle_timer.timer,
|
||
|
|
jiffies + llc->pf_cycle_timer.expire * HZ);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_send_ack_if_needed - check if ack is needed
|
||
|
|
* @sk: current connection structure
|
||
|
|
* @skb: current event
|
||
|
|
*
|
||
|
|
* Checks number of received PDUs which have not been acknowledged, yet,
|
||
|
|
* If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
|
||
|
|
* sends an RR response as acknowledgement for them. Returns 0 for
|
||
|
|
* success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
u8 pf_bit;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
llc_pdu_decode_pf_bit(skb, &pf_bit);
|
||
|
|
llc->ack_pf |= pf_bit & 1;
|
||
|
|
if (!llc->ack_must_be_send) {
|
||
|
|
llc->first_pdu_Ns = llc->vR;
|
||
|
|
llc->ack_must_be_send = 1;
|
||
|
|
llc->ack_pf = pf_bit & 1;
|
||
|
|
}
|
||
|
|
if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) {
|
||
|
|
llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
|
||
|
|
llc->ack_must_be_send = 0;
|
||
|
|
llc->ack_pf = 0;
|
||
|
|
llc_conn_ac_inc_npta_value(sk, skb);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
|
||
|
|
* @sk: current connection structure
|
||
|
|
* @skb: current event
|
||
|
|
*
|
||
|
|
* This action resets ack_must_be_send flag of given connection, this flag
|
||
|
|
* indicates if there is any PDU which has not been acknowledged yet.
|
||
|
|
* Returns 0 for success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
|
||
|
|
* @sk: current connection structure
|
||
|
|
* @skb: current event
|
||
|
|
*
|
||
|
|
* Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
|
||
|
|
* all received PDUs which have not been acknowledged, yet. ack_pf flag is
|
||
|
|
* set to one if one PDU with p-bit set to one is received. Returns 0 for
|
||
|
|
* success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (!rc) {
|
||
|
|
llc_conn_send_pdu(sk, skb);
|
||
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* This action sends an I-format PDU as acknowledge to received PDUs which
|
||
|
|
* have not been acknowledged, yet, if there is any. By using of this
|
||
|
|
* action number of acknowledgements decreases, this technic is called
|
||
|
|
* piggy backing. Returns 0 for success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (llc->ack_must_be_send) {
|
||
|
|
llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
|
||
|
|
llc->ack_must_be_send = 0 ;
|
||
|
|
llc->ack_pf = 0;
|
||
|
|
} else
|
||
|
|
llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* This action sends an RR response with f-bit set to ack_pf flag as
|
||
|
|
* acknowledge to all received PDUs which have not been acknowledged, yet,
|
||
|
|
* if there is any. ack_pf flag indicates if a PDU has been received with
|
||
|
|
* p-bit set to one. Returns 0 for success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int rc = -ENOBUFS;
|
||
|
|
struct sk_buff *nskb = llc_alloc_frame();
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct llc_sap *sap = llc->sap;
|
||
|
|
|
||
|
|
nskb->dev = llc->dev;
|
||
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
||
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
||
|
|
llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
|
||
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
||
|
|
if (rc)
|
||
|
|
goto free;
|
||
|
|
llc_conn_send_pdu(sk, nskb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
free:
|
||
|
|
kfree_skb(nskb);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_inc_npta_value - tries to make value of npta greater
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* After "inc_cntr" times calling of this action, "npta" increase by one.
|
||
|
|
* this action tries to make vale of "npta" greater as possible; number of
|
||
|
|
* acknowledgements decreases by increasing of "npta". Returns 0 for
|
||
|
|
* success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (!llc->inc_cntr) {
|
||
|
|
llc->dec_step = 0;
|
||
|
|
llc->dec_cntr = llc->inc_cntr = 2;
|
||
|
|
++llc->npta;
|
||
|
|
if (llc->npta > 127)
|
||
|
|
llc->npta = 127 ;
|
||
|
|
} else
|
||
|
|
--llc->inc_cntr;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* After receiving "dec_cntr" times RR command, this action decreases
|
||
|
|
* "npta" by one. Returns 0 for success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (!llc->connect_step && !llc->remote_busy_flag) {
|
||
|
|
if (!llc->dec_step) {
|
||
|
|
if (!llc->dec_cntr) {
|
||
|
|
llc->inc_cntr = llc->dec_cntr = 2;
|
||
|
|
if (llc->npta > 0)
|
||
|
|
llc->npta = llc->npta - 1;
|
||
|
|
} else
|
||
|
|
llc->dec_cntr -=1;
|
||
|
|
}
|
||
|
|
} else
|
||
|
|
llc->connect_step = 0 ;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* After receiving "dec_cntr" times RNR command, this action decreases
|
||
|
|
* "npta" by one. Returns 0 for success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (llc->remote_busy_flag)
|
||
|
|
if (!llc->dec_step) {
|
||
|
|
if (!llc->dec_cntr) {
|
||
|
|
llc->inc_cntr = llc->dec_cntr = 2;
|
||
|
|
if (llc->npta > 0)
|
||
|
|
--llc->npta;
|
||
|
|
} else
|
||
|
|
--llc->dec_cntr;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_dec_tx_win_size - decreases tx window size
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* After receiving of a REJ command or response, transmit window size is
|
||
|
|
* decreased by number of PDUs which are outstanding yet. Returns 0 for
|
||
|
|
* success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
|
||
|
|
|
||
|
|
llc->k -= unacked_pdu;
|
||
|
|
if (llc->k < 2)
|
||
|
|
llc->k = 2;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
|
||
|
|
* @sk: current connection structure.
|
||
|
|
* @skb: current event.
|
||
|
|
*
|
||
|
|
* After receiving an RR response with f-bit set to one, transmit window
|
||
|
|
* size is increased by one. Returns 0 for success, 1 otherwise.
|
||
|
|
*/
|
||
|
|
int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
llc->k += 1;
|
||
|
|
if (llc->k > 128)
|
||
|
|
llc->k = 128 ;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
del_timer(&llc->pf_cycle_timer.timer);
|
||
|
|
del_timer(&llc->ack_timer.timer);
|
||
|
|
del_timer(&llc->rej_sent_timer.timer);
|
||
|
|
del_timer(&llc->busy_state_timer.timer);
|
||
|
|
llc->ack_must_be_send = 0;
|
||
|
|
llc->ack_pf = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
del_timer(&llc->rej_sent_timer.timer);
|
||
|
|
del_timer(&llc->pf_cycle_timer.timer);
|
||
|
|
del_timer(&llc->busy_state_timer.timer);
|
||
|
|
llc->ack_must_be_send = 0;
|
||
|
|
llc->ack_pf = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
mod_timer(&llc->rej_sent_timer.timer,
|
||
|
|
jiffies + llc->rej_sent_timer.expire * HZ);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
if (!timer_pending(&llc->ack_timer.timer))
|
||
|
|
mod_timer(&llc->ack_timer.timer,
|
||
|
|
jiffies + llc->ack_timer.expire * HZ);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
del_timer(&llc_sk(sk)->ack_timer.timer);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
del_timer(&llc->pf_cycle_timer.timer);
|
||
|
|
llc_conn_set_p_flag(sk, 0);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
del_timer(&llc_sk(sk)->rej_sent_timer.timer);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int acked;
|
||
|
|
u16 unacked = 0;
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
|
||
|
|
llc->last_nr = PDU_SUPV_GET_Nr(pdu);
|
||
|
|
acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
|
||
|
|
/* On loopback we don't queue I frames in unack_pdu_q queue. */
|
||
|
|
if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
|
||
|
|
llc->retry_count = 0;
|
||
|
|
del_timer(&llc->ack_timer.timer);
|
||
|
|
if (llc->failed_data_req) {
|
||
|
|
/* already, we did not accept data from upper layer
|
||
|
|
* (tx_window full or unacceptable state). Now, we
|
||
|
|
* can send data and must inform to upper layer.
|
||
|
|
*/
|
||
|
|
llc->failed_data_req = 0;
|
||
|
|
llc_conn_ac_data_confirm(sk, skb);
|
||
|
|
}
|
||
|
|
if (unacked)
|
||
|
|
mod_timer(&llc->ack_timer.timer,
|
||
|
|
jiffies + llc->ack_timer.expire * HZ);
|
||
|
|
} else if (llc->failed_data_req) {
|
||
|
|
u8 f_bit;
|
||
|
|
|
||
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
||
|
|
if (f_bit == 1) {
|
||
|
|
llc->failed_data_req = 0;
|
||
|
|
llc_conn_ac_data_confirm(sk, skb);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
|
||
|
|
if (LLC_PDU_IS_RSP(pdu)) {
|
||
|
|
u8 f_bit;
|
||
|
|
|
||
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
||
|
|
if (f_bit) {
|
||
|
|
llc_conn_set_p_flag(sk, 0);
|
||
|
|
llc_conn_ac_stop_p_timer(sk, skb);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->data_flag = 2;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->data_flag = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->data_flag = 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
|
||
|
|
struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
if (!llc_sk(sk)->data_flag)
|
||
|
|
llc_sk(sk)->data_flag = 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_conn_set_p_flag(sk, 0);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_conn_set_p_flag(sk, 1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->remote_busy_flag = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->cause_flag = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->cause_flag = 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->retry_count = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->retry_count++;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->vR = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->vS = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->vS = llc_sk(sk)->last_nr;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
|
||
|
|
{
|
||
|
|
struct sock *sk = (struct sock *)timeout_data;
|
||
|
|
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
|
||
|
|
|
||
|
|
bh_lock_sock(sk);
|
||
|
|
if (skb) {
|
||
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
||
|
|
|
||
|
|
skb->sk = sk;
|
||
|
|
ev->type = LLC_CONN_EV_TYPE_P_TMR;
|
||
|
|
llc_process_tmr_ev(sk, skb);
|
||
|
|
}
|
||
|
|
bh_unlock_sock(sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
void llc_conn_busy_tmr_cb(unsigned long timeout_data)
|
||
|
|
{
|
||
|
|
struct sock *sk = (struct sock *)timeout_data;
|
||
|
|
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
|
||
|
|
|
||
|
|
bh_lock_sock(sk);
|
||
|
|
if (skb) {
|
||
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
||
|
|
|
||
|
|
skb->sk = sk;
|
||
|
|
ev->type = LLC_CONN_EV_TYPE_BUSY_TMR;
|
||
|
|
llc_process_tmr_ev(sk, skb);
|
||
|
|
}
|
||
|
|
bh_unlock_sock(sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
void llc_conn_ack_tmr_cb(unsigned long timeout_data)
|
||
|
|
{
|
||
|
|
struct sock* sk = (struct sock *)timeout_data;
|
||
|
|
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
|
||
|
|
|
||
|
|
bh_lock_sock(sk);
|
||
|
|
if (skb) {
|
||
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
||
|
|
|
||
|
|
skb->sk = sk;
|
||
|
|
ev->type = LLC_CONN_EV_TYPE_ACK_TMR;
|
||
|
|
llc_process_tmr_ev(sk, skb);
|
||
|
|
}
|
||
|
|
bh_unlock_sock(sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
void llc_conn_rej_tmr_cb(unsigned long timeout_data)
|
||
|
|
{
|
||
|
|
struct sock *sk = (struct sock *)timeout_data;
|
||
|
|
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
|
||
|
|
|
||
|
|
bh_lock_sock(sk);
|
||
|
|
if (skb) {
|
||
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
||
|
|
|
||
|
|
skb->sk = sk;
|
||
|
|
ev->type = LLC_CONN_EV_TYPE_REJ_TMR;
|
||
|
|
llc_process_tmr_ev(sk, skb);
|
||
|
|
}
|
||
|
|
bh_unlock_sock(sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk(sk)->X = llc_sk(sk)->vS;
|
||
|
|
llc_conn_ac_set_vs_nr(sk, skb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
||
|
|
u8 nr = PDU_SUPV_GET_Nr(pdu);
|
||
|
|
|
||
|
|
if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
|
||
|
|
llc_conn_ac_set_vs_nr(sk, skb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Non-standard actions; these not contained in IEEE specification; for
|
||
|
|
* our own usage
|
||
|
|
*/
|
||
|
|
/**
|
||
|
|
* llc_conn_disc - removes connection from SAP list and frees it
|
||
|
|
* @sk: closed connection
|
||
|
|
* @skb: occurred event
|
||
|
|
*/
|
||
|
|
int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
/* FIXME: this thing seems to want to die */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_conn_reset - resets connection
|
||
|
|
* @sk : reseting connection.
|
||
|
|
* @skb: occurred event.
|
||
|
|
*
|
||
|
|
* Stop all timers, empty all queues and reset all flags.
|
||
|
|
*/
|
||
|
|
int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
llc_sk_reset(sk);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_circular_between - designates that b is between a and c or not
|
||
|
|
* @a: lower bound
|
||
|
|
* @b: element to see if is between a and b
|
||
|
|
* @c: upper bound
|
||
|
|
*
|
||
|
|
* This function designates that b is between a and c or not (for example,
|
||
|
|
* 0 is between 127 and 1). Returns 1 if b is between a and c, 0
|
||
|
|
* otherwise.
|
||
|
|
*/
|
||
|
|
u8 llc_circular_between(u8 a, u8 b, u8 c)
|
||
|
|
{
|
||
|
|
b = b - a;
|
||
|
|
c = c - a;
|
||
|
|
return b <= c;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* llc_process_tmr_ev - timer backend
|
||
|
|
* @sk: active connection
|
||
|
|
* @skb: occurred event
|
||
|
|
*
|
||
|
|
* This function is called from timer callback functions. When connection
|
||
|
|
* is busy (during sending a data frame) timer expiration event must be
|
||
|
|
* queued. Otherwise this event can be sent to connection state machine.
|
||
|
|
* Queued events will process by llc_backlog_rcv function after sending
|
||
|
|
* data frame.
|
||
|
|
*/
|
||
|
|
static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
|
||
|
|
printk(KERN_WARNING "%s: timer called on closed connection\n",
|
||
|
|
__FUNCTION__);
|
||
|
|
kfree_skb(skb);
|
||
|
|
} else {
|
||
|
|
if (!sock_owned_by_user(sk))
|
||
|
|
llc_conn_state_process(sk, skb);
|
||
|
|
else {
|
||
|
|
llc_set_backlog_type(skb, LLC_EVENT);
|
||
|
|
sk_add_backlog(sk, skb);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|