mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1451 lines
36 KiB
1451 lines
36 KiB
/* |
|
* llc_c_ac.c - actions performed during connection state transition. |
|
* |
|
* Description: |
|
* Functions in this module are implementation of connection component actions |
|
* Details of actions can be found in IEEE-802.2 standard document. |
|
* All functions have one connection and one event as input argument. All of |
|
* them return 0 On success and 1 otherwise. |
|
* |
|
* Copyright (c) 1997 by Procom Technology, Inc. |
|
* 2001-2003 by Arnaldo Carvalho de Melo <[email protected]> |
|
* |
|
* This program can be redistributed or modified under the terms of the |
|
* GNU General Public License as published by the Free Software Foundation. |
|
* This program is distributed without any warranty or implied warranty |
|
* of merchantability or fitness for a particular purpose. |
|
* |
|
* See the GNU General Public License for more details. |
|
*/ |
|
#include <linux/netdevice.h> |
|
#include <linux/slab.h> |
|
#include <net/llc_conn.h> |
|
#include <net/llc_sap.h> |
|
#include <net/sock.h> |
|
#include <net/llc_c_ev.h> |
|
#include <net/llc_c_ac.h> |
|
#include <net/llc_c_st.h> |
|
#include <net/llc_pdu.h> |
|
#include <net/llc.h> |
|
|
|
|
|
static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); |
|
static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); |
|
static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); |
|
|
|
static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); |
|
|
|
static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, |
|
struct sk_buff *skb); |
|
|
|
static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); |
|
|
|
#define INCORRECT 0 |
|
|
|
int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct llc_sock *llc = llc_sk(sk); |
|
|
|
if (llc->remote_busy_flag) { |
|
u8 nr; |
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
|
|
|
llc->remote_busy_flag = 0; |
|
del_timer(&llc->busy_state_timer.timer); |
|
nr = LLC_I_GET_NR(pdu); |
|
llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
|
} |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
|
|
|
ev->ind_prim = LLC_CONN_PRIM; |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
|
|
|
ev->cfm_prim = LLC_CONN_PRIM; |
|
return 0; |
|
} |
|
|
|
static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
|
|
|
ev->cfm_prim = LLC_DATA_PRIM; |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
llc_conn_rtn_pdu(sk, skb); |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
|
u8 reason = 0; |
|
int rc = 0; |
|
|
|
if (ev->type == LLC_CONN_EV_TYPE_PDU) { |
|
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
|
|
|
if (LLC_PDU_IS_RSP(pdu) && |
|
LLC_PDU_TYPE_IS_U(pdu) && |
|
LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) |
|
reason = LLC_DISC_REASON_RX_DM_RSP_PDU; |
|
else if (LLC_PDU_IS_CMD(pdu) && |
|
LLC_PDU_TYPE_IS_U(pdu) && |
|
LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) |
|
reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; |
|
} else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) |
|
reason = LLC_DISC_REASON_ACK_TMR_EXP; |
|
else |
|
rc = -EINVAL; |
|
if (!rc) { |
|
ev->reason = reason; |
|
ev->ind_prim = LLC_DISC_PRIM; |
|
} |
|
return rc; |
|
} |
|
|
|
int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
|
|
|
ev->reason = ev->status; |
|
ev->cfm_prim = LLC_DISC_PRIM; |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
u8 reason = 0; |
|
int rc = 1; |
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
|
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
|
struct llc_sock *llc = llc_sk(sk); |
|
|
|
switch (ev->type) { |
|
case LLC_CONN_EV_TYPE_PDU: |
|
if (LLC_PDU_IS_RSP(pdu) && |
|
LLC_PDU_TYPE_IS_U(pdu) && |
|
LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { |
|
reason = LLC_RESET_REASON_LOCAL; |
|
rc = 0; |
|
} else if (LLC_PDU_IS_CMD(pdu) && |
|
LLC_PDU_TYPE_IS_U(pdu) && |
|
LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { |
|
reason = LLC_RESET_REASON_REMOTE; |
|
rc = 0; |
|
} |
|
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; |
|
} |
|
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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
u8 f_bit; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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, 1); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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(sk, llc->dev, LLC_PDU_TYPE_U, |
|
sizeof(struct llc_frmr_info)); |
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
|
sizeof(struct llc_frmr_info)); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; |
|
|
|
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, 0, llc->vS, |
|
llc->vR, INCORRECT); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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; |
|
struct llc_sock *llc = llc_sk(sk); |
|
|
|
llc_pdu_decode_pf_bit(skb, &f_bit); |
|
nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
|
sizeof(struct llc_frmr_info)); |
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
|
|
|
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 (unlikely(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 (likely(!rc)) { |
|
skb_get(skb); |
|
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 (likely(!rc)) { |
|
skb_get(skb); |
|
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 (likely(!rc)) { |
|
skb_get(skb); |
|
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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (likely(!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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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, 1, llc->vR); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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, 0, llc->vR); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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, 1, llc->vR); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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); |
|
} |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
int rc = -ENOBUFS; |
|
struct llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
u8 f_bit = 1; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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, 1, llc->vR); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
u8 *dmac = llc->daddr.mac; |
|
|
|
if (llc->dev->flags & IFF_LOOPBACK) |
|
dmac = llc->dev->dev_addr; |
|
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 (unlikely(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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
|
|
|
llc_pdu_decode_pf_bit(skb, &f_bit); |
|
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_ua_rsp(nskb, f_bit); |
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
|
if (unlikely(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); |
|
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 + 1 + LLC_2_SEQ_NBR_MODULO) |
|
% LLC_2_SEQ_NBR_MODULO) >= 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 (likely(!rc)) { |
|
skb_get(skb); |
|
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); |
|
int ret; |
|
|
|
if (llc->ack_must_be_send) { |
|
ret = llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); |
|
llc->ack_must_be_send = 0 ; |
|
llc->ack_pf = 0; |
|
} else { |
|
ret = llc_conn_ac_send_i_cmd_p_set_0(sk, skb); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* 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 llc_sock *llc = llc_sk(sk); |
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
|
|
|
if (nskb) { |
|
struct llc_sap *sap = llc->sap; |
|
|
|
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 (unlikely(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 > (u8) ~LLC_2_SEQ_NBR_MODULO) |
|
llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; |
|
} 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); |
|
|
|
if (llc->k - unacked_pdu < 1) |
|
llc->k = 1; |
|
else |
|
llc->k -= unacked_pdu; |
|
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 > (u8) ~LLC_2_SEQ_NBR_MODULO) |
|
llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; |
|
return 0; |
|
} |
|
|
|
int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
llc_sk_stop_all_timers(sk, false); |
|
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); |
|
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); |
|
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); |
|
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); |
|
} 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; |
|
} |
|
|
|
static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO; |
|
return 0; |
|
} |
|
|
|
static void llc_conn_tmr_common_cb(struct sock *sk, u8 type) |
|
{ |
|
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_set_owner_r(skb, sk); |
|
ev->type = type; |
|
llc_process_tmr_ev(sk, skb); |
|
} |
|
bh_unlock_sock(sk); |
|
} |
|
|
|
void llc_conn_pf_cycle_tmr_cb(struct timer_list *t) |
|
{ |
|
struct llc_sock *llc = from_timer(llc, t, pf_cycle_timer.timer); |
|
|
|
llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_P_TMR); |
|
} |
|
|
|
void llc_conn_busy_tmr_cb(struct timer_list *t) |
|
{ |
|
struct llc_sock *llc = from_timer(llc, t, busy_state_timer.timer); |
|
|
|
llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_BUSY_TMR); |
|
} |
|
|
|
void llc_conn_ack_tmr_cb(struct timer_list *t) |
|
{ |
|
struct llc_sock *llc = from_timer(llc, t, ack_timer.timer); |
|
|
|
llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_ACK_TMR); |
|
} |
|
|
|
void llc_conn_rej_tmr_cb(struct timer_list *t) |
|
{ |
|
struct llc_sock *llc = from_timer(llc, t, rej_sent_timer.timer); |
|
|
|
llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_REJ_TMR); |
|
} |
|
|
|
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", |
|
__func__); |
|
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); |
|
} |
|
} |
|
}
|
|
|