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VFS LwIP: state tracking fixes

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Better track the state of TCP connections and PCB pointers. Allow
received data that has queued to be read under any conditions.

Ref #2335
This commit is contained in:
Emery Hemingway 2018-08-13 11:04:05 +02:00 committed by Christian Helmuth
parent 67d88526b9
commit ffd688642a
1 changed files with 56 additions and 29 deletions
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85
repos/libports/src/lib/vfs/lwip/vfs.cc
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@ -1050,7 +1050,8 @@ class Lwip::Tcp_socket_dir final :
destroy(alloc, p);
}
if (state != CLOSED && _pcb != NULL) {
if (_pcb != NULL) {
tcp_arg(_pcb, NULL);
tcp_close(_pcb);
}
@ -1095,8 +1096,13 @@ class Lwip::Tcp_socket_dir final :
void error()
{
state = CLOSED;
/* the PCB is expired now */
_pcb = NULL;
if (_pcb) {
tcp_arg(_pcb, NULL);
tcp_close(_pcb);
_pcb = NULL;
}
/* churn the application */
handle_io(~0U);
@ -1113,11 +1119,12 @@ class Lwip::Tcp_socket_dir final :
if (_recv_pbuf)
return;
tcp_close(_pcb);
tcp_arg(_pcb, NULL);
state = CLOSED;
/* lwIP may reuse the PCB memory for the next connection */
_pcb = NULL;
if (_pcb) {
tcp_arg(_pcb, NULL);
tcp_close(_pcb);
state = CLOSED;
_pcb = NULL;
}
}
/**************************
@ -1174,15 +1181,19 @@ class Lwip::Tcp_socket_dir final :
char *dst, file_size count,
file_size &out_count) override
{
if (_pcb == NULL)
return Read_result::READ_OK;
switch(handle.kind) {
case Lwip_file_handle::DATA:
if (state == READY || state == CLOSING) {
{
if (_recv_pbuf == nullptr) {
return Read_result::READ_QUEUED;
/*
* queue the read if the PCB is active and
* there is nothing to read, otherwise return
* zero to indicate the connection is closed
*/
return (state == READY)
? Read_result::READ_QUEUED
: Read_result::READ_OK;
}
u16_t const ucount = count;
@ -1205,15 +1216,14 @@ class Lwip::Tcp_socket_dir final :
}
/* ACK the remote */
tcp_recved(_pcb, n);
if (_pcb)
tcp_recved(_pcb, n);
if (state == CLOSING)
shutdown();
out_count = n;
return Read_result::READ_OK;
} else if (state == CLOSED) {
return Read_result::READ_OK;
}
break;
@ -1443,12 +1453,15 @@ namespace Lwip {
extern "C" {
static
void udp_recv_callback(void *arg, struct udp_pcb*, struct pbuf *p, const ip_addr_t *addr, u16_t port)
void udp_recv_callback(void *arg, struct udp_pcb*, struct pbuf *buf, const ip_addr_t *addr, u16_t port)
{
if (!arg) return;
Lwip::Udp_socket_dir *socket_dir = static_cast<Lwip::Udp_socket_dir *>(arg);
socket_dir->queue(addr, port, p);
if (arg) {
Lwip::Udp_socket_dir *socket_dir =
static_cast<Lwip::Udp_socket_dir *>(arg);
socket_dir->queue(addr, port, buf);
} else {
pbuf_free(buf);
}
}
@ -1456,8 +1469,8 @@ static
err_t tcp_connect_callback(void *arg, struct tcp_pcb *pcb, err_t)
{
if (!arg) {
tcp_close(pcb);
return ERR_ARG;
tcp_abort(pcb);
return ERR_ABRT;
}
Lwip::Tcp_socket_dir *socket_dir = static_cast<Lwip::Tcp_socket_dir *>(arg);
@ -1474,8 +1487,8 @@ static
err_t tcp_accept_callback(void *arg, struct tcp_pcb *newpcb, err_t err)
{
if (!arg) {
tcp_close(newpcb);
return ERR_OK;
tcp_abort(newpcb);
return ERR_ABRT;
}
Lwip::Tcp_socket_dir *socket_dir = static_cast<Lwip::Tcp_socket_dir *>(arg);
@ -1485,9 +1498,12 @@ err_t tcp_accept_callback(void *arg, struct tcp_pcb *newpcb, err_t err)
static
err_t tcp_recv_callback(void *arg, struct tcp_pcb*, struct pbuf *p, err_t)
err_t tcp_recv_callback(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t)
{
if (!arg) return ERR_ARG;
if (!arg) {
tcp_abort(pcb);
return ERR_ABRT;
}
Lwip::Tcp_socket_dir *socket_dir = static_cast<Lwip::Tcp_socket_dir *>(arg);
if (p == NULL) {
@ -1501,8 +1517,13 @@ err_t tcp_recv_callback(void *arg, struct tcp_pcb*, struct pbuf *p, err_t)
static
err_t tcp_delayed_recv_callback(void *arg, struct tcp_pcb*, struct pbuf *buf, err_t)
err_t tcp_delayed_recv_callback(void *arg, struct tcp_pcb *pcb, struct pbuf *buf, err_t)
{
if (!arg) {
tcp_abort(pcb);
return ERR_ABRT;
}
Lwip::Tcp_socket_dir::Pcb_pending *pending =
static_cast<Lwip::Tcp_socket_dir::Pcb_pending *>(arg);
@ -1516,11 +1537,17 @@ err_t tcp_delayed_recv_callback(void *arg, struct tcp_pcb*, struct pbuf *buf, er
};
/*
/**
* This would be the ACK callback, we could defer sync completion
* until then, but performance is expected to be unacceptable.
*
static
err_t tcp_sent_callback(void *arg, struct tcp_pcb*, u16_t len)
{
if (!arg) return ERR_ARG;
if (!arg) {
tcp_abort(pcb);
return ERR_ABRT;
}
Lwip::Tcp_socket_dir *socket_dir = static_cast<Lwip::Tcp_socket_dir *>(arg);
socket_dir->pending_ack -= len;