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gnrc_tcp: rewrite recv buffer allocation/returning

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This commit is contained in:
Simon Brummer 2020-06-15 15:53:42 +02:00
parent 1ad2d07181
commit 9fe91f5c44
1 changed files with 11 additions and 20 deletions
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31
sys/net/gnrc/transport_layer/tcp/gnrc_tcp_fsm.c
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@ -114,6 +114,8 @@ static int _restart_timewait_timer(gnrc_tcp_tcb_t *tcb)
* @param[in] state State to transition in.
*
* @return Zero on success.
* @return -EADDRINUSE, if @p state == FSM_STATE_SYN_SENT and tcb->local_port
* is already in use.
*/
static int _transition_to(gnrc_tcp_tcb_t *tcb, fsm_state_t state)
{
@ -148,11 +150,6 @@ static int _transition_to(gnrc_tcp_tcb_t *tcb, fsm_state_t state)
#endif
tcb->peer_port = PORT_UNSPEC;
/* Allocate receive buffer */
if (_rcvbuf_get_buffer(tcb) == -ENOMEM) {
return -ENOMEM;
}
/* Add connection to active connections (if not already active) */
mutex_lock(&_list_tcb_lock);
LL_SEARCH(_list_tcb_head, iter, tcb, TCB_EQUAL);
@ -163,11 +160,6 @@ static int _transition_to(gnrc_tcp_tcb_t *tcb, fsm_state_t state)
break;
case FSM_STATE_SYN_SENT:
/* Allocate rceveive buffer */
if (_rcvbuf_get_buffer(tcb) == -ENOMEM) {
return -ENOMEM;
}
/* Add connection to active connections (if not already active) */
mutex_lock(&_list_tcb_lock);
LL_SEARCH(_list_tcb_head, iter, tcb, TCB_EQUAL);
@ -175,10 +167,9 @@ static int _transition_to(gnrc_tcp_tcb_t *tcb, fsm_state_t state)
if (iter == NULL) {
/* Check if port number was specified */
if (tcb->local_port != PORT_UNSPEC) {
/* Check if given port number is use: return error and release buffer */
/* Check if given port number is in use: return error */
if (_is_local_port_in_use(tcb->local_port)) {
mutex_unlock(&_list_tcb_lock);
_rcvbuf_release_buffer(tcb);
return -EADDRINUSE;
}
}
@ -222,14 +213,17 @@ static int _fsm_call_open(gnrc_tcp_tcb_t *tcb)
int ret = 0;
DEBUG("gnrc_tcp_fsm.c : _fsm_call_open()\n");
/* Allocate receive buffer */
if (_rcvbuf_get_buffer(tcb) == -ENOMEM) {
return -ENOMEM;
}
tcb->rcv_wnd = CONFIG_GNRC_TCP_DEFAULT_WINDOW;
if (tcb->status & STATUS_PASSIVE) {
/* Passive open, T: CLOSED -> LISTEN */
if (_transition_to(tcb, FSM_STATE_LISTEN) == -ENOMEM) {
_transition_to(tcb, FSM_STATE_CLOSED);
return -ENOMEM;
}
_transition_to(tcb, FSM_STATE_LISTEN);
}
else {
/* Active Open, set TCB values, send SYN, T: CLOSED -> SYN_SENT */
@ -591,10 +585,7 @@ static int _fsm_rcvd_pkt(gnrc_tcp_tcb_t *tcb, gnrc_pktsnip_t *in_pkt)
if (ctl & MSK_RST) {
/* .. and state is SYN_RCVD and the connection is passive: SYN_RCVD -> LISTEN */
if (tcb->state == FSM_STATE_SYN_RCVD && (tcb->status & STATUS_PASSIVE)) {
if (_transition_to(tcb, FSM_STATE_LISTEN) == -ENOMEM) {
_transition_to(tcb, FSM_STATE_CLOSED);
return -ENOMEM;
}
_transition_to(tcb, FSM_STATE_LISTEN);
}
else {
_transition_to(tcb, FSM_STATE_CLOSED);