| 1 |
62 |
marcus.erl |
/*
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| 2 |
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* llc_c_ac.c - actions performed during connection state transition.
|
| 3 |
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*
|
| 4 |
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* Description:
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| 5 |
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* Functions in this module are implementation of connection component actions
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| 6 |
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* Details of actions can be found in IEEE-802.2 standard document.
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| 7 |
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* All functions have one connection and one event as input argument. All of
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| 8 |
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* them return 0 On success and 1 otherwise.
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| 9 |
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*
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| 10 |
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* Copyright (c) 1997 by Procom Technology, Inc.
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| 11 |
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* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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| 12 |
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*
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| 13 |
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* This program can be redistributed or modified under the terms of the
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| 14 |
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* GNU General Public License as published by the Free Software Foundation.
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| 15 |
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* This program is distributed without any warranty or implied warranty
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| 16 |
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* of merchantability or fitness for a particular purpose.
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| 17 |
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*
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| 18 |
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* See the GNU General Public License for more details.
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| 19 |
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*/
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| 20 |
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#include <linux/netdevice.h>
|
| 21 |
|
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#include <net/llc_conn.h>
|
| 22 |
|
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#include <net/llc_sap.h>
|
| 23 |
|
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#include <net/sock.h>
|
| 24 |
|
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#include <net/llc_c_ev.h>
|
| 25 |
|
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#include <net/llc_c_ac.h>
|
| 26 |
|
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#include <net/llc_c_st.h>
|
| 27 |
|
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#include <net/llc_pdu.h>
|
| 28 |
|
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#include <net/llc.h>
|
| 29 |
|
|
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| 30 |
|
|
|
| 31 |
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static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb);
|
| 32 |
|
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static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb);
|
| 33 |
|
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static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev);
|
| 34 |
|
|
|
| 35 |
|
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static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb);
|
| 36 |
|
|
|
| 37 |
|
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static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
|
| 38 |
|
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struct sk_buff *skb);
|
| 39 |
|
|
|
| 40 |
|
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static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb);
|
| 41 |
|
|
|
| 42 |
|
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#define INCORRECT 0
|
| 43 |
|
|
|
| 44 |
|
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int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb)
|
| 45 |
|
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{
|
| 46 |
|
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struct llc_sock *llc = llc_sk(sk);
|
| 47 |
|
|
|
| 48 |
|
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if (llc->remote_busy_flag) {
|
| 49 |
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u8 nr;
|
| 50 |
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|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 51 |
|
|
|
| 52 |
|
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llc->remote_busy_flag = 0;
|
| 53 |
|
|
del_timer(&llc->busy_state_timer.timer);
|
| 54 |
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nr = LLC_I_GET_NR(pdu);
|
| 55 |
|
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llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
|
| 56 |
|
|
}
|
| 57 |
|
|
return 0;
|
| 58 |
|
|
}
|
| 59 |
|
|
|
| 60 |
|
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int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb)
|
| 61 |
|
|
{
|
| 62 |
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 63 |
|
|
|
| 64 |
|
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ev->ind_prim = LLC_CONN_PRIM;
|
| 65 |
|
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return 0;
|
| 66 |
|
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}
|
| 67 |
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|
|
| 68 |
|
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int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
|
| 69 |
|
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{
|
| 70 |
|
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 71 |
|
|
|
| 72 |
|
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ev->cfm_prim = LLC_CONN_PRIM;
|
| 73 |
|
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return 0;
|
| 74 |
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}
|
| 75 |
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|
|
| 76 |
|
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static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb)
|
| 77 |
|
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{
|
| 78 |
|
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 79 |
|
|
|
| 80 |
|
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ev->cfm_prim = LLC_DATA_PRIM;
|
| 81 |
|
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return 0;
|
| 82 |
|
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}
|
| 83 |
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|
| 84 |
|
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int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb)
|
| 85 |
|
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{
|
| 86 |
|
|
llc_conn_rtn_pdu(sk, skb);
|
| 87 |
|
|
return 0;
|
| 88 |
|
|
}
|
| 89 |
|
|
|
| 90 |
|
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int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
|
| 91 |
|
|
{
|
| 92 |
|
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struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 93 |
|
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u8 reason = 0;
|
| 94 |
|
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int rc = 0;
|
| 95 |
|
|
|
| 96 |
|
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if (ev->type == LLC_CONN_EV_TYPE_PDU) {
|
| 97 |
|
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struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
|
| 98 |
|
|
|
| 99 |
|
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if (LLC_PDU_IS_RSP(pdu) &&
|
| 100 |
|
|
LLC_PDU_TYPE_IS_U(pdu) &&
|
| 101 |
|
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LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM)
|
| 102 |
|
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reason = LLC_DISC_REASON_RX_DM_RSP_PDU;
|
| 103 |
|
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else if (LLC_PDU_IS_CMD(pdu) &&
|
| 104 |
|
|
LLC_PDU_TYPE_IS_U(pdu) &&
|
| 105 |
|
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LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC)
|
| 106 |
|
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reason = LLC_DISC_REASON_RX_DISC_CMD_PDU;
|
| 107 |
|
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} else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR)
|
| 108 |
|
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reason = LLC_DISC_REASON_ACK_TMR_EXP;
|
| 109 |
|
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else
|
| 110 |
|
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rc = -EINVAL;
|
| 111 |
|
|
if (!rc) {
|
| 112 |
|
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ev->reason = reason;
|
| 113 |
|
|
ev->ind_prim = LLC_DISC_PRIM;
|
| 114 |
|
|
}
|
| 115 |
|
|
return rc;
|
| 116 |
|
|
}
|
| 117 |
|
|
|
| 118 |
|
|
int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
|
| 119 |
|
|
{
|
| 120 |
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 121 |
|
|
|
| 122 |
|
|
ev->reason = ev->status;
|
| 123 |
|
|
ev->cfm_prim = LLC_DISC_PRIM;
|
| 124 |
|
|
return 0;
|
| 125 |
|
|
}
|
| 126 |
|
|
|
| 127 |
|
|
int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
|
| 128 |
|
|
{
|
| 129 |
|
|
u8 reason = 0;
|
| 130 |
|
|
int rc = 1;
|
| 131 |
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 132 |
|
|
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
|
| 133 |
|
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struct llc_sock *llc = llc_sk(sk);
|
| 134 |
|
|
|
| 135 |
|
|
switch (ev->type) {
|
| 136 |
|
|
case LLC_CONN_EV_TYPE_PDU:
|
| 137 |
|
|
if (LLC_PDU_IS_RSP(pdu) &&
|
| 138 |
|
|
LLC_PDU_TYPE_IS_U(pdu) &&
|
| 139 |
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LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) {
|
| 140 |
|
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reason = LLC_RESET_REASON_LOCAL;
|
| 141 |
|
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rc = 0;
|
| 142 |
|
|
} else if (LLC_PDU_IS_CMD(pdu) &&
|
| 143 |
|
|
LLC_PDU_TYPE_IS_U(pdu) &&
|
| 144 |
|
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LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
|
| 145 |
|
|
reason = LLC_RESET_REASON_REMOTE;
|
| 146 |
|
|
rc = 0;
|
| 147 |
|
|
}
|
| 148 |
|
|
break;
|
| 149 |
|
|
case LLC_CONN_EV_TYPE_ACK_TMR:
|
| 150 |
|
|
case LLC_CONN_EV_TYPE_P_TMR:
|
| 151 |
|
|
case LLC_CONN_EV_TYPE_REJ_TMR:
|
| 152 |
|
|
case LLC_CONN_EV_TYPE_BUSY_TMR:
|
| 153 |
|
|
if (llc->retry_count > llc->n2) {
|
| 154 |
|
|
reason = LLC_RESET_REASON_LOCAL;
|
| 155 |
|
|
rc = 0;
|
| 156 |
|
|
}
|
| 157 |
|
|
break;
|
| 158 |
|
|
}
|
| 159 |
|
|
if (!rc) {
|
| 160 |
|
|
ev->reason = reason;
|
| 161 |
|
|
ev->ind_prim = LLC_RESET_PRIM;
|
| 162 |
|
|
}
|
| 163 |
|
|
return rc;
|
| 164 |
|
|
}
|
| 165 |
|
|
|
| 166 |
|
|
int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
|
| 167 |
|
|
{
|
| 168 |
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 169 |
|
|
|
| 170 |
|
|
ev->reason = 0;
|
| 171 |
|
|
ev->cfm_prim = LLC_RESET_PRIM;
|
| 172 |
|
|
return 0;
|
| 173 |
|
|
}
|
| 174 |
|
|
|
| 175 |
|
|
int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk,
|
| 176 |
|
|
struct sk_buff *skb)
|
| 177 |
|
|
{
|
| 178 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 179 |
|
|
|
| 180 |
|
|
if (LLC_PDU_IS_RSP(pdu) &&
|
| 181 |
|
|
LLC_PDU_TYPE_IS_I(pdu) &&
|
| 182 |
|
|
LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf)
|
| 183 |
|
|
llc_conn_ac_clear_remote_busy(sk, skb);
|
| 184 |
|
|
return 0;
|
| 185 |
|
|
}
|
| 186 |
|
|
|
| 187 |
|
|
int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
|
| 188 |
|
|
struct sk_buff *skb)
|
| 189 |
|
|
{
|
| 190 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 191 |
|
|
|
| 192 |
|
|
if (llc->data_flag == 2)
|
| 193 |
|
|
del_timer(&llc->rej_sent_timer.timer);
|
| 194 |
|
|
return 0;
|
| 195 |
|
|
}
|
| 196 |
|
|
|
| 197 |
|
|
int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
|
| 198 |
|
|
{
|
| 199 |
|
|
int rc = -ENOBUFS;
|
| 200 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 201 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 202 |
|
|
|
| 203 |
|
|
if (nskb) {
|
| 204 |
|
|
struct llc_sap *sap = llc->sap;
|
| 205 |
|
|
|
| 206 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 207 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 208 |
|
|
llc_pdu_init_as_disc_cmd(nskb, 1);
|
| 209 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 210 |
|
|
if (unlikely(rc))
|
| 211 |
|
|
goto free;
|
| 212 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 213 |
|
|
llc_conn_ac_set_p_flag_1(sk, skb);
|
| 214 |
|
|
}
|
| 215 |
|
|
out:
|
| 216 |
|
|
return rc;
|
| 217 |
|
|
free:
|
| 218 |
|
|
kfree_skb(nskb);
|
| 219 |
|
|
goto out;
|
| 220 |
|
|
}
|
| 221 |
|
|
|
| 222 |
|
|
int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
|
| 223 |
|
|
{
|
| 224 |
|
|
int rc = -ENOBUFS;
|
| 225 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 226 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 227 |
|
|
|
| 228 |
|
|
if (nskb) {
|
| 229 |
|
|
struct llc_sap *sap = llc->sap;
|
| 230 |
|
|
u8 f_bit;
|
| 231 |
|
|
|
| 232 |
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
| 233 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 234 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 235 |
|
|
llc_pdu_init_as_dm_rsp(nskb, f_bit);
|
| 236 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 237 |
|
|
if (unlikely(rc))
|
| 238 |
|
|
goto free;
|
| 239 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 240 |
|
|
}
|
| 241 |
|
|
out:
|
| 242 |
|
|
return rc;
|
| 243 |
|
|
free:
|
| 244 |
|
|
kfree_skb(nskb);
|
| 245 |
|
|
goto out;
|
| 246 |
|
|
}
|
| 247 |
|
|
|
| 248 |
|
|
int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
| 249 |
|
|
{
|
| 250 |
|
|
int rc = -ENOBUFS;
|
| 251 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 252 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 253 |
|
|
|
| 254 |
|
|
if (nskb) {
|
| 255 |
|
|
struct llc_sap *sap = llc->sap;
|
| 256 |
|
|
|
| 257 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 258 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 259 |
|
|
llc_pdu_init_as_dm_rsp(nskb, 1);
|
| 260 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 261 |
|
|
if (unlikely(rc))
|
| 262 |
|
|
goto free;
|
| 263 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 264 |
|
|
}
|
| 265 |
|
|
out:
|
| 266 |
|
|
return rc;
|
| 267 |
|
|
free:
|
| 268 |
|
|
kfree_skb(nskb);
|
| 269 |
|
|
goto out;
|
| 270 |
|
|
}
|
| 271 |
|
|
|
| 272 |
|
|
int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
|
| 273 |
|
|
{
|
| 274 |
|
|
u8 f_bit;
|
| 275 |
|
|
int rc = -ENOBUFS;
|
| 276 |
|
|
struct sk_buff *nskb;
|
| 277 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 278 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 279 |
|
|
|
| 280 |
|
|
llc->rx_pdu_hdr = *((u32 *)pdu);
|
| 281 |
|
|
if (LLC_PDU_IS_CMD(pdu))
|
| 282 |
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
| 283 |
|
|
else
|
| 284 |
|
|
f_bit = 0;
|
| 285 |
|
|
nskb = llc_alloc_frame(sk, llc->dev);
|
| 286 |
|
|
if (nskb) {
|
| 287 |
|
|
struct llc_sap *sap = llc->sap;
|
| 288 |
|
|
|
| 289 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 290 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 291 |
|
|
llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
|
| 292 |
|
|
llc->vR, INCORRECT);
|
| 293 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 294 |
|
|
if (unlikely(rc))
|
| 295 |
|
|
goto free;
|
| 296 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 297 |
|
|
}
|
| 298 |
|
|
out:
|
| 299 |
|
|
return rc;
|
| 300 |
|
|
free:
|
| 301 |
|
|
kfree_skb(nskb);
|
| 302 |
|
|
goto out;
|
| 303 |
|
|
}
|
| 304 |
|
|
|
| 305 |
|
|
int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
|
| 306 |
|
|
{
|
| 307 |
|
|
int rc = -ENOBUFS;
|
| 308 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 309 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 310 |
|
|
|
| 311 |
|
|
if (nskb) {
|
| 312 |
|
|
struct llc_sap *sap = llc->sap;
|
| 313 |
|
|
struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
|
| 314 |
|
|
|
| 315 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 316 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 317 |
|
|
llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS,
|
| 318 |
|
|
llc->vR, INCORRECT);
|
| 319 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 320 |
|
|
if (unlikely(rc))
|
| 321 |
|
|
goto free;
|
| 322 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 323 |
|
|
}
|
| 324 |
|
|
out:
|
| 325 |
|
|
return rc;
|
| 326 |
|
|
free:
|
| 327 |
|
|
kfree_skb(nskb);
|
| 328 |
|
|
goto out;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
|
| 332 |
|
|
{
|
| 333 |
|
|
u8 f_bit;
|
| 334 |
|
|
int rc = -ENOBUFS;
|
| 335 |
|
|
struct sk_buff *nskb;
|
| 336 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 337 |
|
|
|
| 338 |
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
| 339 |
|
|
nskb = llc_alloc_frame(sk, llc->dev);
|
| 340 |
|
|
if (nskb) {
|
| 341 |
|
|
struct llc_sap *sap = llc->sap;
|
| 342 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 343 |
|
|
|
| 344 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 345 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 346 |
|
|
llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
|
| 347 |
|
|
llc->vR, INCORRECT);
|
| 348 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 349 |
|
|
if (unlikely(rc))
|
| 350 |
|
|
goto free;
|
| 351 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 352 |
|
|
}
|
| 353 |
|
|
out:
|
| 354 |
|
|
return rc;
|
| 355 |
|
|
free:
|
| 356 |
|
|
kfree_skb(nskb);
|
| 357 |
|
|
goto out;
|
| 358 |
|
|
}
|
| 359 |
|
|
|
| 360 |
|
|
int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
| 361 |
|
|
{
|
| 362 |
|
|
int rc;
|
| 363 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 364 |
|
|
struct llc_sap *sap = llc->sap;
|
| 365 |
|
|
|
| 366 |
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
| 367 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 368 |
|
|
llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
|
| 369 |
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
| 370 |
|
|
if (likely(!rc)) {
|
| 371 |
|
|
llc_conn_send_pdu(sk, skb);
|
| 372 |
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
| 373 |
|
|
}
|
| 374 |
|
|
return rc;
|
| 375 |
|
|
}
|
| 376 |
|
|
|
| 377 |
|
|
static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
|
| 378 |
|
|
{
|
| 379 |
|
|
int rc;
|
| 380 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 381 |
|
|
struct llc_sap *sap = llc->sap;
|
| 382 |
|
|
|
| 383 |
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
| 384 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 385 |
|
|
llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
|
| 386 |
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
| 387 |
|
|
if (likely(!rc)) {
|
| 388 |
|
|
llc_conn_send_pdu(sk, skb);
|
| 389 |
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
| 390 |
|
|
}
|
| 391 |
|
|
return rc;
|
| 392 |
|
|
}
|
| 393 |
|
|
|
| 394 |
|
|
int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 395 |
|
|
{
|
| 396 |
|
|
int rc;
|
| 397 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 398 |
|
|
struct llc_sap *sap = llc->sap;
|
| 399 |
|
|
|
| 400 |
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
| 401 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 402 |
|
|
llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
|
| 403 |
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
| 404 |
|
|
if (likely(!rc)) {
|
| 405 |
|
|
llc_conn_send_pdu(sk, skb);
|
| 406 |
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
| 407 |
|
|
}
|
| 408 |
|
|
return 0;
|
| 409 |
|
|
}
|
| 410 |
|
|
|
| 411 |
|
|
int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 412 |
|
|
{
|
| 413 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 414 |
|
|
u8 nr = LLC_I_GET_NR(pdu);
|
| 415 |
|
|
|
| 416 |
|
|
llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
|
| 417 |
|
|
return 0;
|
| 418 |
|
|
}
|
| 419 |
|
|
|
| 420 |
|
|
int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
|
| 421 |
|
|
struct sk_buff *skb)
|
| 422 |
|
|
{
|
| 423 |
|
|
u8 nr;
|
| 424 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 425 |
|
|
int rc = -ENOBUFS;
|
| 426 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 427 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 428 |
|
|
|
| 429 |
|
|
if (nskb) {
|
| 430 |
|
|
struct llc_sap *sap = llc->sap;
|
| 431 |
|
|
|
| 432 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 433 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 434 |
|
|
llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
|
| 435 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 436 |
|
|
if (likely(!rc))
|
| 437 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 438 |
|
|
else
|
| 439 |
|
|
kfree_skb(skb);
|
| 440 |
|
|
}
|
| 441 |
|
|
if (rc) {
|
| 442 |
|
|
nr = LLC_I_GET_NR(pdu);
|
| 443 |
|
|
rc = 0;
|
| 444 |
|
|
llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
|
| 445 |
|
|
}
|
| 446 |
|
|
return rc;
|
| 447 |
|
|
}
|
| 448 |
|
|
|
| 449 |
|
|
int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
| 450 |
|
|
{
|
| 451 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 452 |
|
|
u8 nr = LLC_I_GET_NR(pdu);
|
| 453 |
|
|
|
| 454 |
|
|
llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
|
| 455 |
|
|
return 0;
|
| 456 |
|
|
}
|
| 457 |
|
|
|
| 458 |
|
|
int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
| 459 |
|
|
{
|
| 460 |
|
|
int rc = -ENOBUFS;
|
| 461 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 462 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 463 |
|
|
|
| 464 |
|
|
if (nskb) {
|
| 465 |
|
|
struct llc_sap *sap = llc->sap;
|
| 466 |
|
|
|
| 467 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 468 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 469 |
|
|
llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
|
| 470 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 471 |
|
|
if (unlikely(rc))
|
| 472 |
|
|
goto free;
|
| 473 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 474 |
|
|
}
|
| 475 |
|
|
out:
|
| 476 |
|
|
return rc;
|
| 477 |
|
|
free:
|
| 478 |
|
|
kfree_skb(nskb);
|
| 479 |
|
|
goto out;
|
| 480 |
|
|
}
|
| 481 |
|
|
|
| 482 |
|
|
int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
| 483 |
|
|
{
|
| 484 |
|
|
int rc = -ENOBUFS;
|
| 485 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 486 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 487 |
|
|
|
| 488 |
|
|
if (nskb) {
|
| 489 |
|
|
struct llc_sap *sap = llc->sap;
|
| 490 |
|
|
|
| 491 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 492 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 493 |
|
|
llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR);
|
| 494 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 495 |
|
|
if (unlikely(rc))
|
| 496 |
|
|
goto free;
|
| 497 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 498 |
|
|
}
|
| 499 |
|
|
out:
|
| 500 |
|
|
return rc;
|
| 501 |
|
|
free:
|
| 502 |
|
|
kfree_skb(nskb);
|
| 503 |
|
|
goto out;
|
| 504 |
|
|
}
|
| 505 |
|
|
|
| 506 |
|
|
int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 507 |
|
|
{
|
| 508 |
|
|
int rc = -ENOBUFS;
|
| 509 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 510 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 511 |
|
|
|
| 512 |
|
|
if (nskb) {
|
| 513 |
|
|
struct llc_sap *sap = llc->sap;
|
| 514 |
|
|
|
| 515 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 516 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 517 |
|
|
llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR);
|
| 518 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 519 |
|
|
if (unlikely(rc))
|
| 520 |
|
|
goto free;
|
| 521 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 522 |
|
|
}
|
| 523 |
|
|
out:
|
| 524 |
|
|
return rc;
|
| 525 |
|
|
free:
|
| 526 |
|
|
kfree_skb(nskb);
|
| 527 |
|
|
goto out;
|
| 528 |
|
|
}
|
| 529 |
|
|
|
| 530 |
|
|
int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
| 531 |
|
|
{
|
| 532 |
|
|
int rc = -ENOBUFS;
|
| 533 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 534 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 535 |
|
|
|
| 536 |
|
|
if (nskb) {
|
| 537 |
|
|
struct llc_sap *sap = llc->sap;
|
| 538 |
|
|
|
| 539 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 540 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 541 |
|
|
llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
|
| 542 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 543 |
|
|
if (unlikely(rc))
|
| 544 |
|
|
goto free;
|
| 545 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 546 |
|
|
}
|
| 547 |
|
|
out:
|
| 548 |
|
|
return rc;
|
| 549 |
|
|
free:
|
| 550 |
|
|
kfree_skb(nskb);
|
| 551 |
|
|
goto out;
|
| 552 |
|
|
}
|
| 553 |
|
|
|
| 554 |
|
|
int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
| 555 |
|
|
{
|
| 556 |
|
|
int rc = -ENOBUFS;
|
| 557 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 558 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 559 |
|
|
|
| 560 |
|
|
if (nskb) {
|
| 561 |
|
|
struct llc_sap *sap = llc->sap;
|
| 562 |
|
|
|
| 563 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 564 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 565 |
|
|
llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR);
|
| 566 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 567 |
|
|
if (unlikely(rc))
|
| 568 |
|
|
goto free;
|
| 569 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 570 |
|
|
}
|
| 571 |
|
|
out:
|
| 572 |
|
|
return rc;
|
| 573 |
|
|
free:
|
| 574 |
|
|
kfree_skb(nskb);
|
| 575 |
|
|
goto out;
|
| 576 |
|
|
}
|
| 577 |
|
|
|
| 578 |
|
|
int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 579 |
|
|
{
|
| 580 |
|
|
int rc = -ENOBUFS;
|
| 581 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 582 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 583 |
|
|
|
| 584 |
|
|
if (nskb) {
|
| 585 |
|
|
struct llc_sap *sap = llc->sap;
|
| 586 |
|
|
|
| 587 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 588 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 589 |
|
|
llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
|
| 590 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 591 |
|
|
if (unlikely(rc))
|
| 592 |
|
|
goto free;
|
| 593 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 594 |
|
|
}
|
| 595 |
|
|
out:
|
| 596 |
|
|
return rc;
|
| 597 |
|
|
free:
|
| 598 |
|
|
kfree_skb(nskb);
|
| 599 |
|
|
goto out;
|
| 600 |
|
|
}
|
| 601 |
|
|
|
| 602 |
|
|
int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
|
| 603 |
|
|
{
|
| 604 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 605 |
|
|
|
| 606 |
|
|
if (!llc->remote_busy_flag) {
|
| 607 |
|
|
llc->remote_busy_flag = 1;
|
| 608 |
|
|
mod_timer(&llc->busy_state_timer.timer,
|
| 609 |
|
|
jiffies + llc->busy_state_timer.expire);
|
| 610 |
|
|
}
|
| 611 |
|
|
return 0;
|
| 612 |
|
|
}
|
| 613 |
|
|
|
| 614 |
|
|
int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 615 |
|
|
{
|
| 616 |
|
|
int rc = -ENOBUFS;
|
| 617 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 618 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 619 |
|
|
|
| 620 |
|
|
if (nskb) {
|
| 621 |
|
|
struct llc_sap *sap = llc->sap;
|
| 622 |
|
|
|
| 623 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 624 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 625 |
|
|
llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
|
| 626 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 627 |
|
|
if (unlikely(rc))
|
| 628 |
|
|
goto free;
|
| 629 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 630 |
|
|
}
|
| 631 |
|
|
out:
|
| 632 |
|
|
return rc;
|
| 633 |
|
|
free:
|
| 634 |
|
|
kfree_skb(nskb);
|
| 635 |
|
|
goto out;
|
| 636 |
|
|
}
|
| 637 |
|
|
|
| 638 |
|
|
int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
|
| 639 |
|
|
{
|
| 640 |
|
|
int rc = -ENOBUFS;
|
| 641 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 642 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 643 |
|
|
|
| 644 |
|
|
if (nskb) {
|
| 645 |
|
|
struct llc_sap *sap = llc->sap;
|
| 646 |
|
|
|
| 647 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 648 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 649 |
|
|
llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
|
| 650 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 651 |
|
|
if (unlikely(rc))
|
| 652 |
|
|
goto free;
|
| 653 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 654 |
|
|
}
|
| 655 |
|
|
out:
|
| 656 |
|
|
return rc;
|
| 657 |
|
|
free:
|
| 658 |
|
|
kfree_skb(nskb);
|
| 659 |
|
|
goto out;
|
| 660 |
|
|
}
|
| 661 |
|
|
|
| 662 |
|
|
int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
| 663 |
|
|
{
|
| 664 |
|
|
int rc = -ENOBUFS;
|
| 665 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 666 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 667 |
|
|
|
| 668 |
|
|
if (nskb) {
|
| 669 |
|
|
struct llc_sap *sap = llc->sap;
|
| 670 |
|
|
u8 f_bit = 1;
|
| 671 |
|
|
|
| 672 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 673 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 674 |
|
|
llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
|
| 675 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 676 |
|
|
if (unlikely(rc))
|
| 677 |
|
|
goto free;
|
| 678 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 679 |
|
|
}
|
| 680 |
|
|
out:
|
| 681 |
|
|
return rc;
|
| 682 |
|
|
free:
|
| 683 |
|
|
kfree_skb(nskb);
|
| 684 |
|
|
goto out;
|
| 685 |
|
|
}
|
| 686 |
|
|
|
| 687 |
|
|
int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
|
| 688 |
|
|
{
|
| 689 |
|
|
int rc = -ENOBUFS;
|
| 690 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 691 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 692 |
|
|
|
| 693 |
|
|
if (nskb) {
|
| 694 |
|
|
struct llc_sap *sap = llc->sap;
|
| 695 |
|
|
|
| 696 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 697 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 698 |
|
|
llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR);
|
| 699 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 700 |
|
|
if (unlikely(rc))
|
| 701 |
|
|
goto free;
|
| 702 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 703 |
|
|
}
|
| 704 |
|
|
out:
|
| 705 |
|
|
return rc;
|
| 706 |
|
|
free:
|
| 707 |
|
|
kfree_skb(nskb);
|
| 708 |
|
|
goto out;
|
| 709 |
|
|
}
|
| 710 |
|
|
|
| 711 |
|
|
int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 712 |
|
|
{
|
| 713 |
|
|
int rc = -ENOBUFS;
|
| 714 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 715 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 716 |
|
|
|
| 717 |
|
|
if (nskb) {
|
| 718 |
|
|
struct llc_sap *sap = llc->sap;
|
| 719 |
|
|
|
| 720 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 721 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 722 |
|
|
llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
|
| 723 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 724 |
|
|
if (unlikely(rc))
|
| 725 |
|
|
goto free;
|
| 726 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 727 |
|
|
}
|
| 728 |
|
|
out:
|
| 729 |
|
|
return rc;
|
| 730 |
|
|
free:
|
| 731 |
|
|
kfree_skb(nskb);
|
| 732 |
|
|
goto out;
|
| 733 |
|
|
}
|
| 734 |
|
|
|
| 735 |
|
|
int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
|
| 736 |
|
|
{
|
| 737 |
|
|
int rc = -ENOBUFS;
|
| 738 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 739 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 740 |
|
|
|
| 741 |
|
|
if (nskb) {
|
| 742 |
|
|
struct llc_sap *sap = llc->sap;
|
| 743 |
|
|
|
| 744 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 745 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 746 |
|
|
llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
|
| 747 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 748 |
|
|
if (unlikely(rc))
|
| 749 |
|
|
goto free;
|
| 750 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 751 |
|
|
}
|
| 752 |
|
|
out:
|
| 753 |
|
|
return rc;
|
| 754 |
|
|
free:
|
| 755 |
|
|
kfree_skb(nskb);
|
| 756 |
|
|
goto out;
|
| 757 |
|
|
}
|
| 758 |
|
|
|
| 759 |
|
|
void llc_conn_set_p_flag(struct sock *sk, u8 value)
|
| 760 |
|
|
{
|
| 761 |
|
|
int state_changed = llc_sk(sk)->p_flag && !value;
|
| 762 |
|
|
|
| 763 |
|
|
llc_sk(sk)->p_flag = value;
|
| 764 |
|
|
|
| 765 |
|
|
if (state_changed)
|
| 766 |
|
|
sk->sk_state_change(sk);
|
| 767 |
|
|
}
|
| 768 |
|
|
|
| 769 |
|
|
int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
|
| 770 |
|
|
{
|
| 771 |
|
|
int rc = -ENOBUFS;
|
| 772 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 773 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 774 |
|
|
|
| 775 |
|
|
if (nskb) {
|
| 776 |
|
|
struct llc_sap *sap = llc->sap;
|
| 777 |
|
|
u8 *dmac = llc->daddr.mac;
|
| 778 |
|
|
|
| 779 |
|
|
if (llc->dev->flags & IFF_LOOPBACK)
|
| 780 |
|
|
dmac = llc->dev->dev_addr;
|
| 781 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 782 |
|
|
llc->daddr.lsap, LLC_PDU_CMD);
|
| 783 |
|
|
llc_pdu_init_as_sabme_cmd(nskb, 1);
|
| 784 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
|
| 785 |
|
|
if (unlikely(rc))
|
| 786 |
|
|
goto free;
|
| 787 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 788 |
|
|
llc_conn_set_p_flag(sk, 1);
|
| 789 |
|
|
}
|
| 790 |
|
|
out:
|
| 791 |
|
|
return rc;
|
| 792 |
|
|
free:
|
| 793 |
|
|
kfree_skb(nskb);
|
| 794 |
|
|
goto out;
|
| 795 |
|
|
}
|
| 796 |
|
|
|
| 797 |
|
|
int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
|
| 798 |
|
|
{
|
| 799 |
|
|
u8 f_bit;
|
| 800 |
|
|
int rc = -ENOBUFS;
|
| 801 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 802 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 803 |
|
|
|
| 804 |
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
| 805 |
|
|
if (nskb) {
|
| 806 |
|
|
struct llc_sap *sap = llc->sap;
|
| 807 |
|
|
|
| 808 |
|
|
nskb->dev = llc->dev;
|
| 809 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
|
| 810 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 811 |
|
|
llc_pdu_init_as_ua_rsp(nskb, f_bit);
|
| 812 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 813 |
|
|
if (unlikely(rc))
|
| 814 |
|
|
goto free;
|
| 815 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 816 |
|
|
}
|
| 817 |
|
|
out:
|
| 818 |
|
|
return rc;
|
| 819 |
|
|
free:
|
| 820 |
|
|
kfree_skb(nskb);
|
| 821 |
|
|
goto out;
|
| 822 |
|
|
}
|
| 823 |
|
|
|
| 824 |
|
|
int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
|
| 825 |
|
|
{
|
| 826 |
|
|
llc_sk(sk)->s_flag = 0;
|
| 827 |
|
|
return 0;
|
| 828 |
|
|
}
|
| 829 |
|
|
|
| 830 |
|
|
int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
|
| 831 |
|
|
{
|
| 832 |
|
|
llc_sk(sk)->s_flag = 1;
|
| 833 |
|
|
return 0;
|
| 834 |
|
|
}
|
| 835 |
|
|
|
| 836 |
|
|
int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
|
| 837 |
|
|
{
|
| 838 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 839 |
|
|
|
| 840 |
|
|
llc_conn_set_p_flag(sk, 1);
|
| 841 |
|
|
mod_timer(&llc->pf_cycle_timer.timer,
|
| 842 |
|
|
jiffies + llc->pf_cycle_timer.expire);
|
| 843 |
|
|
return 0;
|
| 844 |
|
|
}
|
| 845 |
|
|
|
| 846 |
|
|
/**
|
| 847 |
|
|
* llc_conn_ac_send_ack_if_needed - check if ack is needed
|
| 848 |
|
|
* @sk: current connection structure
|
| 849 |
|
|
* @skb: current event
|
| 850 |
|
|
*
|
| 851 |
|
|
* Checks number of received PDUs which have not been acknowledged, yet,
|
| 852 |
|
|
* If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
|
| 853 |
|
|
* sends an RR response as acknowledgement for them. Returns 0 for
|
| 854 |
|
|
* success, 1 otherwise.
|
| 855 |
|
|
*/
|
| 856 |
|
|
int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
|
| 857 |
|
|
{
|
| 858 |
|
|
u8 pf_bit;
|
| 859 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 860 |
|
|
|
| 861 |
|
|
llc_pdu_decode_pf_bit(skb, &pf_bit);
|
| 862 |
|
|
llc->ack_pf |= pf_bit & 1;
|
| 863 |
|
|
if (!llc->ack_must_be_send) {
|
| 864 |
|
|
llc->first_pdu_Ns = llc->vR;
|
| 865 |
|
|
llc->ack_must_be_send = 1;
|
| 866 |
|
|
llc->ack_pf = pf_bit & 1;
|
| 867 |
|
|
}
|
| 868 |
|
|
if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO)
|
| 869 |
|
|
% LLC_2_SEQ_NBR_MODULO) >= llc->npta) {
|
| 870 |
|
|
llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
|
| 871 |
|
|
llc->ack_must_be_send = 0;
|
| 872 |
|
|
llc->ack_pf = 0;
|
| 873 |
|
|
llc_conn_ac_inc_npta_value(sk, skb);
|
| 874 |
|
|
}
|
| 875 |
|
|
return 0;
|
| 876 |
|
|
}
|
| 877 |
|
|
|
| 878 |
|
|
/**
|
| 879 |
|
|
* llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
|
| 880 |
|
|
* @sk: current connection structure
|
| 881 |
|
|
* @skb: current event
|
| 882 |
|
|
*
|
| 883 |
|
|
* This action resets ack_must_be_send flag of given connection, this flag
|
| 884 |
|
|
* indicates if there is any PDU which has not been acknowledged yet.
|
| 885 |
|
|
* Returns 0 for success, 1 otherwise.
|
| 886 |
|
|
*/
|
| 887 |
|
|
int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
|
| 888 |
|
|
{
|
| 889 |
|
|
llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
|
| 890 |
|
|
return 0;
|
| 891 |
|
|
}
|
| 892 |
|
|
|
| 893 |
|
|
/**
|
| 894 |
|
|
* llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
|
| 895 |
|
|
* @sk: current connection structure
|
| 896 |
|
|
* @skb: current event
|
| 897 |
|
|
*
|
| 898 |
|
|
* Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
|
| 899 |
|
|
* all received PDUs which have not been acknowledged, yet. ack_pf flag is
|
| 900 |
|
|
* set to one if one PDU with p-bit set to one is received. Returns 0 for
|
| 901 |
|
|
* success, 1 otherwise.
|
| 902 |
|
|
*/
|
| 903 |
|
|
static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
|
| 904 |
|
|
struct sk_buff *skb)
|
| 905 |
|
|
{
|
| 906 |
|
|
int rc;
|
| 907 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 908 |
|
|
struct llc_sap *sap = llc->sap;
|
| 909 |
|
|
|
| 910 |
|
|
llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
|
| 911 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 912 |
|
|
llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
|
| 913 |
|
|
rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
|
| 914 |
|
|
if (likely(!rc)) {
|
| 915 |
|
|
llc_conn_send_pdu(sk, skb);
|
| 916 |
|
|
llc_conn_ac_inc_vs_by_1(sk, skb);
|
| 917 |
|
|
}
|
| 918 |
|
|
return rc;
|
| 919 |
|
|
}
|
| 920 |
|
|
|
| 921 |
|
|
/**
|
| 922 |
|
|
* llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
|
| 923 |
|
|
* @sk: current connection structure.
|
| 924 |
|
|
* @skb: current event.
|
| 925 |
|
|
*
|
| 926 |
|
|
* This action sends an I-format PDU as acknowledge to received PDUs which
|
| 927 |
|
|
* have not been acknowledged, yet, if there is any. By using of this
|
| 928 |
|
|
* action number of acknowledgements decreases, this technic is called
|
| 929 |
|
|
* piggy backing. Returns 0 for success, 1 otherwise.
|
| 930 |
|
|
*/
|
| 931 |
|
|
int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
|
| 932 |
|
|
{
|
| 933 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 934 |
|
|
|
| 935 |
|
|
if (llc->ack_must_be_send) {
|
| 936 |
|
|
llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
|
| 937 |
|
|
llc->ack_must_be_send = 0 ;
|
| 938 |
|
|
llc->ack_pf = 0;
|
| 939 |
|
|
} else
|
| 940 |
|
|
llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
|
| 941 |
|
|
return 0;
|
| 942 |
|
|
}
|
| 943 |
|
|
|
| 944 |
|
|
/**
|
| 945 |
|
|
* llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
|
| 946 |
|
|
* @sk: current connection structure.
|
| 947 |
|
|
* @skb: current event.
|
| 948 |
|
|
*
|
| 949 |
|
|
* This action sends an RR response with f-bit set to ack_pf flag as
|
| 950 |
|
|
* acknowledge to all received PDUs which have not been acknowledged, yet,
|
| 951 |
|
|
* if there is any. ack_pf flag indicates if a PDU has been received with
|
| 952 |
|
|
* p-bit set to one. Returns 0 for success, 1 otherwise.
|
| 953 |
|
|
*/
|
| 954 |
|
|
static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
|
| 955 |
|
|
struct sk_buff *skb)
|
| 956 |
|
|
{
|
| 957 |
|
|
int rc = -ENOBUFS;
|
| 958 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 959 |
|
|
struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
|
| 960 |
|
|
|
| 961 |
|
|
if (nskb) {
|
| 962 |
|
|
struct llc_sap *sap = llc->sap;
|
| 963 |
|
|
|
| 964 |
|
|
llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
|
| 965 |
|
|
llc->daddr.lsap, LLC_PDU_RSP);
|
| 966 |
|
|
llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
|
| 967 |
|
|
rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
|
| 968 |
|
|
if (unlikely(rc))
|
| 969 |
|
|
goto free;
|
| 970 |
|
|
llc_conn_send_pdu(sk, nskb);
|
| 971 |
|
|
}
|
| 972 |
|
|
out:
|
| 973 |
|
|
return rc;
|
| 974 |
|
|
free:
|
| 975 |
|
|
kfree_skb(nskb);
|
| 976 |
|
|
goto out;
|
| 977 |
|
|
}
|
| 978 |
|
|
|
| 979 |
|
|
/**
|
| 980 |
|
|
* llc_conn_ac_inc_npta_value - tries to make value of npta greater
|
| 981 |
|
|
* @sk: current connection structure.
|
| 982 |
|
|
* @skb: current event.
|
| 983 |
|
|
*
|
| 984 |
|
|
* After "inc_cntr" times calling of this action, "npta" increase by one.
|
| 985 |
|
|
* this action tries to make vale of "npta" greater as possible; number of
|
| 986 |
|
|
* acknowledgements decreases by increasing of "npta". Returns 0 for
|
| 987 |
|
|
* success, 1 otherwise.
|
| 988 |
|
|
*/
|
| 989 |
|
|
static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
|
| 990 |
|
|
{
|
| 991 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 992 |
|
|
|
| 993 |
|
|
if (!llc->inc_cntr) {
|
| 994 |
|
|
llc->dec_step = 0;
|
| 995 |
|
|
llc->dec_cntr = llc->inc_cntr = 2;
|
| 996 |
|
|
++llc->npta;
|
| 997 |
|
|
if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO)
|
| 998 |
|
|
llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO;
|
| 999 |
|
|
} else
|
| 1000 |
|
|
--llc->inc_cntr;
|
| 1001 |
|
|
return 0;
|
| 1002 |
|
|
}
|
| 1003 |
|
|
|
| 1004 |
|
|
/**
|
| 1005 |
|
|
* llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
|
| 1006 |
|
|
* @sk: current connection structure.
|
| 1007 |
|
|
* @skb: current event.
|
| 1008 |
|
|
*
|
| 1009 |
|
|
* After receiving "dec_cntr" times RR command, this action decreases
|
| 1010 |
|
|
* "npta" by one. Returns 0 for success, 1 otherwise.
|
| 1011 |
|
|
*/
|
| 1012 |
|
|
int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
|
| 1013 |
|
|
{
|
| 1014 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1015 |
|
|
|
| 1016 |
|
|
if (!llc->connect_step && !llc->remote_busy_flag) {
|
| 1017 |
|
|
if (!llc->dec_step) {
|
| 1018 |
|
|
if (!llc->dec_cntr) {
|
| 1019 |
|
|
llc->inc_cntr = llc->dec_cntr = 2;
|
| 1020 |
|
|
if (llc->npta > 0)
|
| 1021 |
|
|
llc->npta = llc->npta - 1;
|
| 1022 |
|
|
} else
|
| 1023 |
|
|
llc->dec_cntr -=1;
|
| 1024 |
|
|
}
|
| 1025 |
|
|
} else
|
| 1026 |
|
|
llc->connect_step = 0 ;
|
| 1027 |
|
|
return 0;
|
| 1028 |
|
|
}
|
| 1029 |
|
|
|
| 1030 |
|
|
/**
|
| 1031 |
|
|
* llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
|
| 1032 |
|
|
* @sk: current connection structure.
|
| 1033 |
|
|
* @skb: current event.
|
| 1034 |
|
|
*
|
| 1035 |
|
|
* After receiving "dec_cntr" times RNR command, this action decreases
|
| 1036 |
|
|
* "npta" by one. Returns 0 for success, 1 otherwise.
|
| 1037 |
|
|
*/
|
| 1038 |
|
|
int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
|
| 1039 |
|
|
{
|
| 1040 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1041 |
|
|
|
| 1042 |
|
|
if (llc->remote_busy_flag)
|
| 1043 |
|
|
if (!llc->dec_step) {
|
| 1044 |
|
|
if (!llc->dec_cntr) {
|
| 1045 |
|
|
llc->inc_cntr = llc->dec_cntr = 2;
|
| 1046 |
|
|
if (llc->npta > 0)
|
| 1047 |
|
|
--llc->npta;
|
| 1048 |
|
|
} else
|
| 1049 |
|
|
--llc->dec_cntr;
|
| 1050 |
|
|
}
|
| 1051 |
|
|
return 0;
|
| 1052 |
|
|
}
|
| 1053 |
|
|
|
| 1054 |
|
|
/**
|
| 1055 |
|
|
* llc_conn_ac_dec_tx_win_size - decreases tx window size
|
| 1056 |
|
|
* @sk: current connection structure.
|
| 1057 |
|
|
* @skb: current event.
|
| 1058 |
|
|
*
|
| 1059 |
|
|
* After receiving of a REJ command or response, transmit window size is
|
| 1060 |
|
|
* decreased by number of PDUs which are outstanding yet. Returns 0 for
|
| 1061 |
|
|
* success, 1 otherwise.
|
| 1062 |
|
|
*/
|
| 1063 |
|
|
int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
|
| 1064 |
|
|
{
|
| 1065 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1066 |
|
|
u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
|
| 1067 |
|
|
|
| 1068 |
|
|
if (llc->k - unacked_pdu < 1)
|
| 1069 |
|
|
llc->k = 1;
|
| 1070 |
|
|
else
|
| 1071 |
|
|
llc->k -= unacked_pdu;
|
| 1072 |
|
|
return 0;
|
| 1073 |
|
|
}
|
| 1074 |
|
|
|
| 1075 |
|
|
/**
|
| 1076 |
|
|
* llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
|
| 1077 |
|
|
* @sk: current connection structure.
|
| 1078 |
|
|
* @skb: current event.
|
| 1079 |
|
|
*
|
| 1080 |
|
|
* After receiving an RR response with f-bit set to one, transmit window
|
| 1081 |
|
|
* size is increased by one. Returns 0 for success, 1 otherwise.
|
| 1082 |
|
|
*/
|
| 1083 |
|
|
int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
|
| 1084 |
|
|
{
|
| 1085 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1086 |
|
|
|
| 1087 |
|
|
llc->k += 1;
|
| 1088 |
|
|
if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO)
|
| 1089 |
|
|
llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO;
|
| 1090 |
|
|
return 0;
|
| 1091 |
|
|
}
|
| 1092 |
|
|
|
| 1093 |
|
|
int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
|
| 1094 |
|
|
{
|
| 1095 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1096 |
|
|
|
| 1097 |
|
|
del_timer(&llc->pf_cycle_timer.timer);
|
| 1098 |
|
|
del_timer(&llc->ack_timer.timer);
|
| 1099 |
|
|
del_timer(&llc->rej_sent_timer.timer);
|
| 1100 |
|
|
del_timer(&llc->busy_state_timer.timer);
|
| 1101 |
|
|
llc->ack_must_be_send = 0;
|
| 1102 |
|
|
llc->ack_pf = 0;
|
| 1103 |
|
|
return 0;
|
| 1104 |
|
|
}
|
| 1105 |
|
|
|
| 1106 |
|
|
int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
|
| 1107 |
|
|
{
|
| 1108 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1109 |
|
|
|
| 1110 |
|
|
del_timer(&llc->rej_sent_timer.timer);
|
| 1111 |
|
|
del_timer(&llc->pf_cycle_timer.timer);
|
| 1112 |
|
|
del_timer(&llc->busy_state_timer.timer);
|
| 1113 |
|
|
llc->ack_must_be_send = 0;
|
| 1114 |
|
|
llc->ack_pf = 0;
|
| 1115 |
|
|
return 0;
|
| 1116 |
|
|
}
|
| 1117 |
|
|
|
| 1118 |
|
|
int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
|
| 1119 |
|
|
{
|
| 1120 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1121 |
|
|
|
| 1122 |
|
|
mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire);
|
| 1123 |
|
|
return 0;
|
| 1124 |
|
|
}
|
| 1125 |
|
|
|
| 1126 |
|
|
int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
|
| 1127 |
|
|
{
|
| 1128 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1129 |
|
|
|
| 1130 |
|
|
mod_timer(&llc->rej_sent_timer.timer,
|
| 1131 |
|
|
jiffies + llc->rej_sent_timer.expire);
|
| 1132 |
|
|
return 0;
|
| 1133 |
|
|
}
|
| 1134 |
|
|
|
| 1135 |
|
|
int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
|
| 1136 |
|
|
struct sk_buff *skb)
|
| 1137 |
|
|
{
|
| 1138 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1139 |
|
|
|
| 1140 |
|
|
if (!timer_pending(&llc->ack_timer.timer))
|
| 1141 |
|
|
mod_timer(&llc->ack_timer.timer,
|
| 1142 |
|
|
jiffies + llc->ack_timer.expire);
|
| 1143 |
|
|
return 0;
|
| 1144 |
|
|
}
|
| 1145 |
|
|
|
| 1146 |
|
|
int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
|
| 1147 |
|
|
{
|
| 1148 |
|
|
del_timer(&llc_sk(sk)->ack_timer.timer);
|
| 1149 |
|
|
return 0;
|
| 1150 |
|
|
}
|
| 1151 |
|
|
|
| 1152 |
|
|
int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
|
| 1153 |
|
|
{
|
| 1154 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1155 |
|
|
|
| 1156 |
|
|
del_timer(&llc->pf_cycle_timer.timer);
|
| 1157 |
|
|
llc_conn_set_p_flag(sk, 0);
|
| 1158 |
|
|
return 0;
|
| 1159 |
|
|
}
|
| 1160 |
|
|
|
| 1161 |
|
|
int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
|
| 1162 |
|
|
{
|
| 1163 |
|
|
del_timer(&llc_sk(sk)->rej_sent_timer.timer);
|
| 1164 |
|
|
return 0;
|
| 1165 |
|
|
}
|
| 1166 |
|
|
|
| 1167 |
|
|
int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
|
| 1168 |
|
|
{
|
| 1169 |
|
|
int acked;
|
| 1170 |
|
|
u16 unacked = 0;
|
| 1171 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 1172 |
|
|
struct llc_sock *llc = llc_sk(sk);
|
| 1173 |
|
|
|
| 1174 |
|
|
llc->last_nr = PDU_SUPV_GET_Nr(pdu);
|
| 1175 |
|
|
acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
|
| 1176 |
|
|
/* On loopback we don't queue I frames in unack_pdu_q queue. */
|
| 1177 |
|
|
if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
|
| 1178 |
|
|
llc->retry_count = 0;
|
| 1179 |
|
|
del_timer(&llc->ack_timer.timer);
|
| 1180 |
|
|
if (llc->failed_data_req) {
|
| 1181 |
|
|
/* already, we did not accept data from upper layer
|
| 1182 |
|
|
* (tx_window full or unacceptable state). Now, we
|
| 1183 |
|
|
* can send data and must inform to upper layer.
|
| 1184 |
|
|
*/
|
| 1185 |
|
|
llc->failed_data_req = 0;
|
| 1186 |
|
|
llc_conn_ac_data_confirm(sk, skb);
|
| 1187 |
|
|
}
|
| 1188 |
|
|
if (unacked)
|
| 1189 |
|
|
mod_timer(&llc->ack_timer.timer,
|
| 1190 |
|
|
jiffies + llc->ack_timer.expire);
|
| 1191 |
|
|
} else if (llc->failed_data_req) {
|
| 1192 |
|
|
u8 f_bit;
|
| 1193 |
|
|
|
| 1194 |
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
| 1195 |
|
|
if (f_bit == 1) {
|
| 1196 |
|
|
llc->failed_data_req = 0;
|
| 1197 |
|
|
llc_conn_ac_data_confirm(sk, skb);
|
| 1198 |
|
|
}
|
| 1199 |
|
|
}
|
| 1200 |
|
|
return 0;
|
| 1201 |
|
|
}
|
| 1202 |
|
|
|
| 1203 |
|
|
int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
|
| 1204 |
|
|
{
|
| 1205 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 1206 |
|
|
|
| 1207 |
|
|
if (LLC_PDU_IS_RSP(pdu)) {
|
| 1208 |
|
|
u8 f_bit;
|
| 1209 |
|
|
|
| 1210 |
|
|
llc_pdu_decode_pf_bit(skb, &f_bit);
|
| 1211 |
|
|
if (f_bit) {
|
| 1212 |
|
|
llc_conn_set_p_flag(sk, 0);
|
| 1213 |
|
|
llc_conn_ac_stop_p_timer(sk, skb);
|
| 1214 |
|
|
}
|
| 1215 |
|
|
}
|
| 1216 |
|
|
return 0;
|
| 1217 |
|
|
}
|
| 1218 |
|
|
|
| 1219 |
|
|
int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
|
| 1220 |
|
|
{
|
| 1221 |
|
|
llc_sk(sk)->data_flag = 2;
|
| 1222 |
|
|
return 0;
|
| 1223 |
|
|
}
|
| 1224 |
|
|
|
| 1225 |
|
|
int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
|
| 1226 |
|
|
{
|
| 1227 |
|
|
llc_sk(sk)->data_flag = 0;
|
| 1228 |
|
|
return 0;
|
| 1229 |
|
|
}
|
| 1230 |
|
|
|
| 1231 |
|
|
int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
|
| 1232 |
|
|
{
|
| 1233 |
|
|
llc_sk(sk)->data_flag = 1;
|
| 1234 |
|
|
return 0;
|
| 1235 |
|
|
}
|
| 1236 |
|
|
|
| 1237 |
|
|
int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
|
| 1238 |
|
|
struct sk_buff *skb)
|
| 1239 |
|
|
{
|
| 1240 |
|
|
if (!llc_sk(sk)->data_flag)
|
| 1241 |
|
|
llc_sk(sk)->data_flag = 1;
|
| 1242 |
|
|
return 0;
|
| 1243 |
|
|
}
|
| 1244 |
|
|
|
| 1245 |
|
|
int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
|
| 1246 |
|
|
{
|
| 1247 |
|
|
llc_conn_set_p_flag(sk, 0);
|
| 1248 |
|
|
return 0;
|
| 1249 |
|
|
}
|
| 1250 |
|
|
|
| 1251 |
|
|
static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
|
| 1252 |
|
|
{
|
| 1253 |
|
|
llc_conn_set_p_flag(sk, 1);
|
| 1254 |
|
|
return 0;
|
| 1255 |
|
|
}
|
| 1256 |
|
|
|
| 1257 |
|
|
int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
|
| 1258 |
|
|
{
|
| 1259 |
|
|
llc_sk(sk)->remote_busy_flag = 0;
|
| 1260 |
|
|
return 0;
|
| 1261 |
|
|
}
|
| 1262 |
|
|
|
| 1263 |
|
|
int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
|
| 1264 |
|
|
{
|
| 1265 |
|
|
llc_sk(sk)->cause_flag = 0;
|
| 1266 |
|
|
return 0;
|
| 1267 |
|
|
}
|
| 1268 |
|
|
|
| 1269 |
|
|
int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
|
| 1270 |
|
|
{
|
| 1271 |
|
|
llc_sk(sk)->cause_flag = 1;
|
| 1272 |
|
|
return 0;
|
| 1273 |
|
|
}
|
| 1274 |
|
|
|
| 1275 |
|
|
int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
|
| 1276 |
|
|
{
|
| 1277 |
|
|
llc_sk(sk)->retry_count = 0;
|
| 1278 |
|
|
return 0;
|
| 1279 |
|
|
}
|
| 1280 |
|
|
|
| 1281 |
|
|
int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
|
| 1282 |
|
|
{
|
| 1283 |
|
|
llc_sk(sk)->retry_count++;
|
| 1284 |
|
|
return 0;
|
| 1285 |
|
|
}
|
| 1286 |
|
|
|
| 1287 |
|
|
int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
|
| 1288 |
|
|
{
|
| 1289 |
|
|
llc_sk(sk)->vR = 0;
|
| 1290 |
|
|
return 0;
|
| 1291 |
|
|
}
|
| 1292 |
|
|
|
| 1293 |
|
|
int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
|
| 1294 |
|
|
{
|
| 1295 |
|
|
llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
|
| 1296 |
|
|
return 0;
|
| 1297 |
|
|
}
|
| 1298 |
|
|
|
| 1299 |
|
|
int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
|
| 1300 |
|
|
{
|
| 1301 |
|
|
llc_sk(sk)->vS = 0;
|
| 1302 |
|
|
return 0;
|
| 1303 |
|
|
}
|
| 1304 |
|
|
|
| 1305 |
|
|
int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
|
| 1306 |
|
|
{
|
| 1307 |
|
|
llc_sk(sk)->vS = llc_sk(sk)->last_nr;
|
| 1308 |
|
|
return 0;
|
| 1309 |
|
|
}
|
| 1310 |
|
|
|
| 1311 |
|
|
static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
|
| 1312 |
|
|
{
|
| 1313 |
|
|
llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO;
|
| 1314 |
|
|
return 0;
|
| 1315 |
|
|
}
|
| 1316 |
|
|
|
| 1317 |
|
|
static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
|
| 1318 |
|
|
{
|
| 1319 |
|
|
struct sock *sk = (struct sock *)timeout_data;
|
| 1320 |
|
|
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
|
| 1321 |
|
|
|
| 1322 |
|
|
bh_lock_sock(sk);
|
| 1323 |
|
|
if (skb) {
|
| 1324 |
|
|
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
|
| 1325 |
|
|
|
| 1326 |
|
|
skb_set_owner_r(skb, sk);
|
| 1327 |
|
|
ev->type = type;
|
| 1328 |
|
|
llc_process_tmr_ev(sk, skb);
|
| 1329 |
|
|
}
|
| 1330 |
|
|
bh_unlock_sock(sk);
|
| 1331 |
|
|
}
|
| 1332 |
|
|
|
| 1333 |
|
|
void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
|
| 1334 |
|
|
{
|
| 1335 |
|
|
llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR);
|
| 1336 |
|
|
}
|
| 1337 |
|
|
|
| 1338 |
|
|
void llc_conn_busy_tmr_cb(unsigned long timeout_data)
|
| 1339 |
|
|
{
|
| 1340 |
|
|
llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR);
|
| 1341 |
|
|
}
|
| 1342 |
|
|
|
| 1343 |
|
|
void llc_conn_ack_tmr_cb(unsigned long timeout_data)
|
| 1344 |
|
|
{
|
| 1345 |
|
|
llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR);
|
| 1346 |
|
|
}
|
| 1347 |
|
|
|
| 1348 |
|
|
void llc_conn_rej_tmr_cb(unsigned long timeout_data)
|
| 1349 |
|
|
{
|
| 1350 |
|
|
llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR);
|
| 1351 |
|
|
}
|
| 1352 |
|
|
|
| 1353 |
|
|
int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
|
| 1354 |
|
|
{
|
| 1355 |
|
|
llc_sk(sk)->X = llc_sk(sk)->vS;
|
| 1356 |
|
|
llc_conn_ac_set_vs_nr(sk, skb);
|
| 1357 |
|
|
return 0;
|
| 1358 |
|
|
}
|
| 1359 |
|
|
|
| 1360 |
|
|
int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
|
| 1361 |
|
|
{
|
| 1362 |
|
|
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
|
| 1363 |
|
|
u8 nr = PDU_SUPV_GET_Nr(pdu);
|
| 1364 |
|
|
|
| 1365 |
|
|
if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
|
| 1366 |
|
|
llc_conn_ac_set_vs_nr(sk, skb);
|
| 1367 |
|
|
return 0;
|
| 1368 |
|
|
}
|
| 1369 |
|
|
|
| 1370 |
|
|
/*
|
| 1371 |
|
|
* Non-standard actions; these not contained in IEEE specification; for
|
| 1372 |
|
|
* our own usage
|
| 1373 |
|
|
*/
|
| 1374 |
|
|
/**
|
| 1375 |
|
|
* llc_conn_disc - removes connection from SAP list and frees it
|
| 1376 |
|
|
* @sk: closed connection
|
| 1377 |
|
|
* @skb: occurred event
|
| 1378 |
|
|
*/
|
| 1379 |
|
|
int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
|
| 1380 |
|
|
{
|
| 1381 |
|
|
/* FIXME: this thing seems to want to die */
|
| 1382 |
|
|
return 0;
|
| 1383 |
|
|
}
|
| 1384 |
|
|
|
| 1385 |
|
|
/**
|
| 1386 |
|
|
* llc_conn_reset - resets connection
|
| 1387 |
|
|
* @sk : reseting connection.
|
| 1388 |
|
|
* @skb: occurred event.
|
| 1389 |
|
|
*
|
| 1390 |
|
|
* Stop all timers, empty all queues and reset all flags.
|
| 1391 |
|
|
*/
|
| 1392 |
|
|
int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
|
| 1393 |
|
|
{
|
| 1394 |
|
|
llc_sk_reset(sk);
|
| 1395 |
|
|
return 0;
|
| 1396 |
|
|
}
|
| 1397 |
|
|
|
| 1398 |
|
|
/**
|
| 1399 |
|
|
* llc_circular_between - designates that b is between a and c or not
|
| 1400 |
|
|
* @a: lower bound
|
| 1401 |
|
|
* @b: element to see if is between a and b
|
| 1402 |
|
|
* @c: upper bound
|
| 1403 |
|
|
*
|
| 1404 |
|
|
* This function designates that b is between a and c or not (for example,
|
| 1405 |
|
|
* 0 is between 127 and 1). Returns 1 if b is between a and c, 0
|
| 1406 |
|
|
* otherwise.
|
| 1407 |
|
|
*/
|
| 1408 |
|
|
u8 llc_circular_between(u8 a, u8 b, u8 c)
|
| 1409 |
|
|
{
|
| 1410 |
|
|
b = b - a;
|
| 1411 |
|
|
c = c - a;
|
| 1412 |
|
|
return b <= c;
|
| 1413 |
|
|
}
|
| 1414 |
|
|
|
| 1415 |
|
|
/**
|
| 1416 |
|
|
* llc_process_tmr_ev - timer backend
|
| 1417 |
|
|
* @sk: active connection
|
| 1418 |
|
|
* @skb: occurred event
|
| 1419 |
|
|
*
|
| 1420 |
|
|
* This function is called from timer callback functions. When connection
|
| 1421 |
|
|
* is busy (during sending a data frame) timer expiration event must be
|
| 1422 |
|
|
* queued. Otherwise this event can be sent to connection state machine.
|
| 1423 |
|
|
* Queued events will process by llc_backlog_rcv function after sending
|
| 1424 |
|
|
* data frame.
|
| 1425 |
|
|
*/
|
| 1426 |
|
|
static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
|
| 1427 |
|
|
{
|
| 1428 |
|
|
if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
|
| 1429 |
|
|
printk(KERN_WARNING "%s: timer called on closed connection\n",
|
| 1430 |
|
|
__FUNCTION__);
|
| 1431 |
|
|
kfree_skb(skb);
|
| 1432 |
|
|
} else {
|
| 1433 |
|
|
if (!sock_owned_by_user(sk))
|
| 1434 |
|
|
llc_conn_state_process(sk, skb);
|
| 1435 |
|
|
else {
|
| 1436 |
|
|
llc_set_backlog_type(skb, LLC_EVENT);
|
| 1437 |
|
|
sk_add_backlog(sk, skb);
|
| 1438 |
|
|
}
|
| 1439 |
|
|
}
|
| 1440 |
|
|
}
|
