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task #14600: tcp_alloc(): kill TF_CLOSEPEND connections before other ESTABLISHED

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goldsimon 2017-11-21 12:53:33 +01:00
parent 5dc3072af8
commit 444dfeada8
1 changed files with 25 additions and 0 deletions
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25
src/core/tcp.c
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@ -1719,6 +1719,28 @@ tcp_kill_timewait(void)
} }
} }
/* Called when allocating a pcb fails.
* In this case, we want to handle all pcbs that want to close first: if we can
* now send the FIN (which failed before), the pcb might be in a state that is
* OK for us to now free it.
*/
static void
tcp_handle_closepend(void)
{
struct tcp_pcb *pcb = tcp_active_pcbs;
while (pcb != NULL) {
struct tcp_pcb *next = pcb->next;
/* send pending FIN */
if (pcb->flags & TF_CLOSEPEND) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: pending FIN\n"));
tcp_clear_flags(pcb, TF_CLOSEPEND);
tcp_close_shutdown_fin(pcb);
}
pcb = next;
}
}
/** /**
* Allocate a new tcp_pcb structure. * Allocate a new tcp_pcb structure.
* *
@ -1732,6 +1754,9 @@ tcp_alloc(u8_t prio)
pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB); pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
if (pcb == NULL) { if (pcb == NULL) {
/* Try to send FIN for all pcbs stuck in TF_CLOSEPEND first */
tcp_handle_closepend();
/* Try killing oldest connection in TIME-WAIT. */ /* Try killing oldest connection in TIME-WAIT. */
LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n")); LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
tcp_kill_timewait(); tcp_kill_timewait();