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fixed bug #33871: rejecting TCP_EVENT_RECV() for the last packet including FIN can lose data

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This commit is contained in:
Simon Goldschmidt 2011-09-23 19:14:17 +02:00
parent e145c1d31c
commit 918470affc
4 changed files with 61 additions and 12 deletions
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4
CHANGELOG
View File

@ -65,6 +65,10 @@ HISTORY
++ Bugfixes:
2011-09-23: Simon Goldschmidt
* pbuf.h, tcp.c, tcp_in.c: fixed bug #33871: rejecting TCP_EVENT_RECV() for
the last packet including FIN can lose data
2011-09-22: Simon Goldschmidt
* tcp_impl.h: fixed bug #34355: nagle does not take snd_buf/snd_queuelen into
account

23
src/core/tcp.c
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@ -1054,13 +1054,32 @@ tcp_fasttmr(void)
if (pcb->refused_data != NULL) {
/* Notify again application with data previously received. */
err_t err;
u8_t refused_flags = pcb->refused_data->flags;
/* set pcb->refused_data to NULL in case the callback frees it and then
closes the pcb */
struct pbuf *refused_data = pcb->refused_data;
pcb->refused_data = NULL;
LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
TCP_EVENT_RECV(pcb, refused_data, ERR_OK, err);
if (err == ERR_OK) {
pcb->refused_data = NULL;
/* did refused_data include a FIN? If so, handle it now. */
if (refused_flags & PBUF_FLAG_TCP_FIN) {
/* correct rcv_wnd as the application won't call tcp_recved()
for the FIN's seqno */
if (pcb->rcv_wnd != TCP_WND) {
pcb->rcv_wnd++;
}
TCP_EVENT_CLOSED(pcb, err);
if (err == ERR_ABRT) {
pcb = NULL;
}
}
} else if (err == ERR_ABRT) {
/* if err == ERR_ABRT, 'pcb' is already deallocated */
pcb = NULL;
} else {
/* data is still refused */
pcb->refused_data = refused_data;
}
}

44
src/core/tcp_in.c
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@ -306,17 +306,36 @@ tcp_input(struct pbuf *p, struct netif *inp)
/* If there is data which was previously "refused" by upper layer */
if (pcb->refused_data != NULL) {
u8_t refused_flags = pcb->refused_data->flags;
/* set pcb->refused_data to NULL in case the callback frees it and then
closes the pcb */
struct pbuf *refused_data = pcb->refused_data;
pcb->refused_data = NULL;
/* Notify again application with data previously received. */
LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: notify kept packet\n"));
TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
TCP_EVENT_RECV(pcb, refused_data, ERR_OK, err);
if (err == ERR_OK) {
pcb->refused_data = NULL;
/* did refused_data include a FIN? */
if (refused_flags & PBUF_FLAG_TCP_FIN) {
/* correct rcv_wnd as the application won't call tcp_recved()
for the FIN's seqno */
if (pcb->rcv_wnd != TCP_WND) {
pcb->rcv_wnd++;
}
TCP_EVENT_CLOSED(pcb, err);
if (err == ERR_ABRT) {
goto dropped;
}
}
} else if ((err == ERR_ABRT) || (tcplen > 0)) {
/* if err == ERR_ABRT, 'pcb' is already deallocated */
/* Drop incoming packets because pcb is "full" (only if the incoming
segment contains data). */
LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: drop incoming packets, because pcb is \"full\"\n"));
goto dropped;
} else {
/* data is still refused, pbuf is still valid (go on for ACK-only packets) */
pcb->refused_data = refused_data;
}
}
tcp_input_pcb = pcb;
@ -375,14 +394,19 @@ tcp_input(struct pbuf *p, struct netif *inp)
/* If a FIN segment was received, we call the callback
function with a NULL buffer to indicate EOF. */
if (recv_flags & TF_GOT_FIN) {
/* correct rcv_wnd as the application won't call tcp_recved()
for the FIN's seqno */
if (pcb->rcv_wnd != TCP_WND) {
pcb->rcv_wnd++;
}
TCP_EVENT_CLOSED(pcb, err);
if (err == ERR_ABRT) {
goto aborted;
if (pcb->refused_data != NULL) {
/* Delay this if we have refused data. */
pcb->refused_data->flags |= PBUF_FLAG_TCP_FIN;
} else {
/* correct rcv_wnd as the application won't call tcp_recved()
for the FIN's seqno */
if (pcb->rcv_wnd != TCP_WND) {
pcb->rcv_wnd++;
}
TCP_EVENT_CLOSED(pcb, err);
if (err == ERR_ABRT) {
goto aborted;
}
}
}

2
src/include/lwip/pbuf.h
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@ -80,6 +80,8 @@ typedef enum {
#define PBUF_FLAG_LLBCAST 0x08U
/** indicates this pbuf was received as link-level multicast */
#define PBUF_FLAG_LLMCAST 0x10U
/** indicates this pbuf includes a TCP FIN flag */
#define PBUF_FLAG_TCP_FIN 0x20U
struct pbuf {
/** next pbuf in singly linked pbuf chain */