int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_CLEARED ? 0 : 1;
}
/**
* llc_send_disc - Called by upper layer to close a connection
* @sk: connection to be closed
*
* Upper layer calls this when it wants to close an established LLC
* connection with a remote machine. This function packages a proper event
* and sends it to connection component state machine. Returns 0 for
* success, 1 otherwise.
*/
int llc_send_disc(struct sock *sk)
{
u16 rc = 1;
struct llc_conn_state_ev *ev;
struct sk_buff *skb;
sock_hold(sk);
if (sk->sk_type != SOCK_STREAM || sk->sk_state != TCP_ESTABLISHED ||
llc_sk(sk)->state == LLC_CONN_STATE_ADM ||
llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC)
goto out;
/*
* Postpone unassigning the connection from its SAP and returning the
* connection until all ACTIONs have been completely executed
*/
skb = alloc_skb(0, GFP_ATOMIC);
if (!skb)
goto out;
skb_set_owner_w(skb, sk);
sk->sk_state = TCP_CLOSING;
ev = llc_conn_ev(skb);
ev->type = LLC_CONN_EV_TYPE_PRIM;
ev->prim = LLC_DISC_PRIM;
ev->prim_type = LLC_PRIM_TYPE_REQ;
rc = llc_conn_state_process(sk, skb);
out:
sock_put(sk);
return rc;
}
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_ev_qlfy_set_status_received(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_RECEIVED;
return 0;
}
int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb)
{
const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_DETECTED ? 0 : 1;
}
int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb)
{
const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->prim == LLC_DATA_PRIM &&
ev->prim_type == LLC_PRIM_TYPE_REQ ? 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;
}
/**
* llc_build_and_send_pkt - Connection data sending for upper layers.
* @sk: connection
* @skb: packet to send
*
* This function is called when upper layer wants to send data using
* connection oriented communication mode. During sending data, connection
* will be locked and received frames and expired timers will be queued.
* Returns 0 for success, -ECONNABORTED when the connection already
* closed and -EBUSY when sending data is not permitted in this state or
* LLC has send an I pdu with p bit set to 1 and is waiting for it's
* response.
*/
int llc_build_and_send_pkt(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev;
int rc = -ECONNABORTED;
struct llc_opt *llc = llc_sk(sk);
if (llc->state == LLC_CONN_STATE_ADM)
goto out;
rc = -EBUSY;
if (llc_data_accept_state(llc->state)) { /* data_conn_refuse */
llc->failed_data_req = 1;
goto out;
}
if (llc->p_flag) {
llc->failed_data_req = 1;
goto out;
}
ev = llc_conn_ev(skb);
ev->type = LLC_CONN_EV_TYPE_PRIM;
ev->prim = LLC_DATA_PRIM;
ev->prim_type = LLC_PRIM_TYPE_REQ;
skb->dev = llc->dev;
rc = llc_conn_state_process(sk, skb);
out:
return rc;
}
int llc_conn_ev_qlfy_set_status_impossible(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_IMPOSSIBLE;
return 0;
}
int llc_conn_ev_qlfy_set_status_failed(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_FAILED;
return 0;
}
int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
ev->prim_type == LLC_CONN_EV_TX_BUFF_FULL ? 0 : 1;
}
int llc_conn_ev_qlfy_set_status_disc(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_DISC;
return 0;
}
/**
* llc_establish_connection - Called by upper layer to establish a conn
* @sk: connection
* @lmac: local mac address
* @dmac: destination mac address
* @dsap: destination sap
*
* Upper layer calls this to establish an LLC connection with a remote
* machine. This function packages a proper event and sends it connection
* component state machine. Success or failure of connection
* establishment will inform to upper layer via calling it's confirm
* function and passing proper information.
*/
int llc_establish_connection(struct sock *sk, u8 *lmac, u8 *dmac, u8 dsap)
{
int rc = -EISCONN;
struct llc_addr laddr, daddr;
struct sk_buff *skb;
struct llc_opt *llc = llc_sk(sk);
struct sock *existing;
laddr.lsap = llc->sap->laddr.lsap;
daddr.lsap = dsap;
memcpy(daddr.mac, dmac, sizeof(daddr.mac));
memcpy(laddr.mac, lmac, sizeof(laddr.mac));
existing = llc_lookup_established(llc->sap, &daddr, &laddr);
if (existing) {
if (existing->sk_state == TCP_ESTABLISHED) {
sk = existing;
goto out_put;
} else
sock_put(existing);
}
sock_hold(sk);
rc = -ENOMEM;
skb = alloc_skb(0, GFP_ATOMIC);
if (skb) {
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->type = LLC_CONN_EV_TYPE_PRIM;
ev->prim = LLC_CONN_PRIM;
ev->prim_type = LLC_PRIM_TYPE_REQ;
rc = llc_conn_state_process(sk, skb);
}
out_put:
sock_put(sk);
return rc;
}
int llc_conn_ev_qlfy_set_status_conflict(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_CONFLICT;
return 0;
}
int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->prim == LLC_CONN_PRIM &&
ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
}
int llc_conn_ev_rst_resp(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->prim == LLC_RESET_PRIM &&
ev->prim_type == LLC_PRIM_TYPE_RESP ? 0 : 1;
}
int llc_conn_ev_qlfy_set_status_refuse(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_REFUSE;
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_ev_qlfy_set_status_rst_done(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_RESET_DONE;
return 0;
}
/**
* llc_conn_rcv - sends received pdus to the connection state machine
* @sk: current connection structure.
* @skb: received frame.
*
* Sends received pdus to the connection state machine.
*/
static int llc_conn_rcv(struct sock* sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->type = LLC_CONN_EV_TYPE_PDU;
ev->reason = 0;
return llc_conn_state_process(sk, skb);
}
int llc_conn_ev_qlfy_set_status_remote_busy(struct sock *sk,
struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
ev->status = LLC_STATUS_REMOTE_BUSY;
return 0;
}
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_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_ev_any_tmr_exp(struct sock *sk, struct sk_buff *skb)
{
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
return ev->type == LLC_CONN_EV_TYPE_P_TMR ||
ev->type == LLC_CONN_EV_TYPE_ACK_TMR ||
ev->type == LLC_CONN_EV_TYPE_REJ_TMR ||
ev->type == LLC_CONN_EV_TYPE_BUSY_TMR ? 0 : 1;
}
static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
{
struct sock *sk = (struct sock *)timeout_data;
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
bh_lock_sock(sk);
if (skb) {
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
skb_set_owner_r(skb, sk);
ev->type = type;
llc_process_tmr_ev(sk, skb);
}
bh_unlock_sock(sk);
}
void llc_conn_rej_tmr_cb(unsigned long timeout_data)
{
struct sock *sk = (struct sock *)timeout_data;
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
bh_lock_sock(sk);
if (skb) {
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
skb->sk = sk;
ev->type = LLC_CONN_EV_TYPE_REJ_TMR;
llc_process_tmr_ev(sk, skb);
}
bh_unlock_sock(sk);
}
int llc_conn_ac_rst_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;
}
int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOTCONN;
u8 dsap;
struct llc_sap *sap;
llc_pdu_decode_dsap(skb, &dsap);
sap = llc_sap_find(dsap);
if (sap) {
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
struct llc_opt *llc = llc_sk(sk);
llc_pdu_decode_sa(skb, llc->daddr.mac);
llc_pdu_decode_da(skb, llc->laddr.mac);
llc->dev = skb->dev;
ev->ind_prim = LLC_CONN_PRIM;
rc = 0;
}
return rc;
}
/**
* llc_qualify_conn_ev - finds transition for event
* @sk: connection
* @skb: happened event
*
* This function finds transition that matches with happened event.
* Returns pointer to found transition on success, %NULL otherwise.
*/
static struct llc_conn_state_trans *llc_qualify_conn_ev(struct sock *sk,
struct sk_buff *skb)
{
struct llc_conn_state_trans **next_trans;
llc_conn_ev_qfyr_t *next_qualifier;
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
struct llc_sock *llc = llc_sk(sk);
struct llc_conn_state *curr_state =
&llc_conn_state_table[llc->state - 1];
/* search thru events for this state until
* list exhausted or until no more
*/
for (next_trans = curr_state->transitions +
llc_find_offset(llc->state - 1, ev->type);
(*next_trans)->ev; next_trans++) {
if (!((*next_trans)->ev)(sk, skb)) {
/* got POSSIBLE event match; the event may require
* qualification based on the values of a number of
* state flags; if all qualifications are met (i.e.,
* if all qualifying functions return success, or 0,
* then this is THE event we're looking for
*/
for (next_qualifier = (*next_trans)->ev_qualifiers;
next_qualifier && *next_qualifier &&
!(*next_qualifier)(sk, skb); next_qualifier++)
/* nothing */;
if (!next_qualifier || !*next_qualifier)
/* all qualifiers executed successfully; this is
* our transition; return it so we can perform
* the associated actions & change the state
*/
return *next_trans;
}
}
return NULL;
}
static struct llc_conn_state_trans *llc_qualify_conn_ev(struct sock *sk,
struct sk_buff *skb)
{
struct llc_conn_state_trans **next_trans;
llc_conn_ev_qfyr_t *next_qualifier;
struct llc_conn_state_ev *ev = llc_conn_ev(skb);
struct llc_sock *llc = llc_sk(sk);
struct llc_conn_state *curr_state =
&llc_conn_state_table[llc->state - 1];
for (next_trans = curr_state->transitions +
llc_find_offset(llc->state - 1, ev->type);
(*next_trans)->ev; next_trans++) {
if (!((*next_trans)->ev)(sk, skb)) {
for (next_qualifier = (*next_trans)->ev_qualifiers;
next_qualifier && *next_qualifier &&
!(*next_qualifier)(sk, skb); next_qualifier++)
;
if (!next_qualifier || !*next_qualifier)
return *next_trans;
}
}
return NULL;
}
