int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1;
}
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_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_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{
const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1;
}
int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
LLC_S_PF_IS_1(pdu) &&
LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
}
int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
return llc_conn_space(sk, skb) &&
LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
LLC_I_PF_IS_1(pdu) &&
LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
}
int llc_sap_ev_rx_test_c(struct llc_sap *sap, struct sk_buff *skb)
{
struct llc_sap_state_ev *ev = llc_sap_ev(skb);
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
LLC_PDU_TYPE_IS_U(pdu) &&
LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
}
static int llc_stat_ev_rx_null_dsap_test_c(struct sk_buff *skb)
{
struct llc_station_state_ev *ev = llc_station_ev(skb);
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
return ev->type == LLC_STATION_EV_TYPE_PDU &&
LLC_PDU_IS_CMD(pdu) && /* command PDU */
LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST &&
!pdu->dsap ? 0 : 1; /* NULL DSAP */
}
int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk,
struct sk_buff *skb)
{
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
u8 vr = llc_sk(sk)->vR;
u8 ns = LLC_I_GET_NS(pdu);
return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
LLC_I_PF_IS_1(pdu) && ns != vr &&
!llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
}
int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk,
struct sk_buff *skb)
{
struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb);
u8 vr = llc_sk(sk)->vR;
u8 ns = LLC_I_GET_NS(pdu);
u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
if (!rc)
dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
__FUNCTION__, llc_sk(sk)->state, ns, vr);
return rc;
}
int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{
u16 rc = 1;
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
if (LLC_PDU_IS_CMD(pdu)) {
if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
if (LLC_I_PF_IS_1(pdu))
rc = 0;
} else if (LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PF_IS_1(pdu))
rc = 0;
}
return rc;
}
int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk,
struct sk_buff *skb)
{
u16 rc = 1;
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
u8 vs = llc_sk(sk)->vS;
u8 nr = LLC_I_GET_NR(pdu);
if (LLC_PDU_IS_CMD(pdu) &&
(LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
__FUNCTION__, llc_sk(sk)->state, vs, nr);
rc = 0;
}
return rc;
}
int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{
u16 rc = 1;
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
if (LLC_PDU_IS_CMD(pdu)) {
if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
rc = 0;
else if (LLC_PDU_TYPE_IS_U(pdu))
switch (LLC_U_PDU_CMD(pdu)) {
case LLC_2_PDU_CMD_SABME:
case LLC_2_PDU_CMD_DISC:
rc = 0;
break;
}
}
return rc;
}
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_opt *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;
} else {
reason = 0;
rc = 1;
}
break;
case LLC_CONN_EV_TYPE_ACK_TMR:
case LLC_CONN_EV_TYPE_P_TMR:
case LLC_CONN_EV_TYPE_REJ_TMR:
case LLC_CONN_EV_TYPE_BUSY_TMR:
if (llc->retry_count > llc->n2) {
reason = LLC_RESET_REASON_LOCAL;
rc = 0;
} else
rc = 1;
break;
}
if (!rc) {
ev->reason = reason;
ev->ind_prim = LLC_RESET_PRIM;
}
return rc;
}