static int
multi_tcp_post(struct multi_context *m, struct multi_instance *mi, const int action)
{
struct context *c = multi_tcp_context(m, mi);
int newaction = TA_UNDEF;
#define MTP_NONE 0
#define MTP_TUN_OUT (1<<0)
#define MTP_LINK_OUT (1<<1)
unsigned int flags = MTP_NONE;
if (TUN_OUT(c))
{
flags |= MTP_TUN_OUT;
}
if (LINK_OUT(c))
{
flags |= MTP_LINK_OUT;
}
switch (flags)
{
case MTP_TUN_OUT|MTP_LINK_OUT:
case MTP_TUN_OUT:
newaction = TA_TUN_WRITE;
break;
case MTP_LINK_OUT:
newaction = TA_SOCKET_WRITE;
break;
case MTP_NONE:
if (mi && socket_read_residual(c->c2.link_socket))
{
newaction = TA_SOCKET_READ_RESIDUAL;
}
else
{
multi_tcp_set_global_rw_flags(m, mi);
}
break;
default:
{
struct gc_arena gc = gc_new();
msg(M_FATAL, "MULTI TCP: multi_tcp_post bad state, mi=%s flags=%d",
multi_instance_string(mi, false, &gc),
flags);
gc_free(&gc);
break;
}
}
dmsg(D_MULTI_DEBUG, "MULTI TCP: multi_tcp_post %s -> %s",
pract(action),
pract(newaction));
return newaction;
}
void
io_wait_dowork (struct context *c, const unsigned int flags)
{
unsigned int socket = 0;
unsigned int tuntap = 0;
struct event_set_return esr[4];
/* These shifts all depend on EVENT_READ and EVENT_WRITE */
static int socket_shift = 0; /* depends on SOCKET_READ and SOCKET_WRITE */
static int tun_shift = 2; /* depends on TUN_READ and TUN_WRITE */
static int err_shift = 4; /* depends on ES_ERROR */
#ifdef ENABLE_MANAGEMENT
static int management_shift = 6; /* depends on MANAGEMENT_READ and MANAGEMENT_WRITE */
#endif
/*
* Decide what kind of events we want to wait for.
*/
event_reset (c->c2.event_set);
/*
* On win32 we use the keyboard or an event object as a source
* of asynchronous signals.
*/
if (flags & IOW_WAIT_SIGNAL)
wait_signal (c->c2.event_set, (void*)&err_shift);
/*
* If outgoing data (for TCP/UDP port) pending, wait for ready-to-send
* status from TCP/UDP port. Otherwise, wait for incoming data on
* TUN/TAP device.
*/
if (flags & IOW_TO_LINK)
{
if (flags & IOW_SHAPER)
{
/*
* If sending this packet would put us over our traffic shaping
* quota, don't send -- instead compute the delay we must wait
* until it will be OK to send the packet.
*/
#ifdef ENABLE_FEATURE_SHAPER
int delay = 0;
/* set traffic shaping delay in microseconds */
if (c->options.shaper)
delay = max_int (delay, shaper_delay (&c->c2.shaper));
if (delay < 1000)
{
socket |= EVENT_WRITE;
}
else
{
shaper_soonest_event (&c->c2.timeval, delay);
}
#else /* ENABLE_FEATURE_SHAPER */
socket |= EVENT_WRITE;
#endif /* ENABLE_FEATURE_SHAPER */
}
else
{
socket |= EVENT_WRITE;
}
}
else if (!((flags & IOW_FRAG) && TO_LINK_FRAG (c)))
{
if (flags & IOW_READ_TUN)
tuntap |= EVENT_READ;
}
/*
* If outgoing data (for TUN/TAP device) pending, wait for ready-to-send status
* from device. Otherwise, wait for incoming data on TCP/UDP port.
*/
if (flags & IOW_TO_TUN)
{
tuntap |= EVENT_WRITE;
}
else
{
if (flags & IOW_READ_LINK)
socket |= EVENT_READ;
}
/*
* outgoing bcast buffer waiting to be sent?
*/
if (flags & IOW_MBUF)
socket |= EVENT_WRITE;
/*
* Force wait on TUN input, even if also waiting on TCP/UDP output
*/
if (flags & IOW_READ_TUN_FORCE)
tuntap |= EVENT_READ;
/*
* Configure event wait based on socket, tuntap flags.
*/
socket_set (c->c2.link_socket, c->c2.event_set, socket, (void*)&socket_shift, NULL);
tun_set (c->c1.tuntap, c->c2.event_set, tuntap, (void*)&tun_shift, NULL);
#ifdef ENABLE_MANAGEMENT
if (management)
management_socket_set (management, c->c2.event_set, (void*)&management_shift, NULL);
#endif
/*
* Possible scenarios:
* (1) tcp/udp port has data available to read
* (2) tcp/udp port is ready to accept more data to write
* (3) tun dev has data available to read
* (4) tun dev is ready to accept more data to write
* (5) we received a signal (handler sets signal_received)
* (6) timeout (tv) expired
*/
c->c2.event_set_status = ES_ERROR;
if (!c->sig->signal_received)
{
if (!(flags & IOW_CHECK_RESIDUAL) || !socket_read_residual (c->c2.link_socket))
{
int status;
#ifdef ENABLE_DEBUG
if (check_debug_level (D_EVENT_WAIT))
show_wait_status (c);
#endif
/*
* Wait for something to happen.
*/
status = event_wait (c->c2.event_set, &c->c2.timeval, esr, SIZE(esr));
check_status (status, "event_wait", NULL, NULL);
if (status > 0)
{
int i;
c->c2.event_set_status = 0;
for (i = 0; i < status; ++i)
{
const struct event_set_return *e = &esr[i];
c->c2.event_set_status |= ((e->rwflags & 3) << *((int*)e->arg));
}
}
else if (status == 0)
{
c->c2.event_set_status = ES_TIMEOUT;
}
}
else
{
c->c2.event_set_status = SOCKET_READ;
}
}
/* 'now' should always be a reasonably up-to-date timestamp */
update_time ();
/* set signal_received if a signal was received */
if (c->c2.event_set_status & ES_ERROR)
get_signal (&c->sig->signal_received);
dmsg (D_EVENT_WAIT, "I/O WAIT status=0x%04x", c->c2.event_set_status);
}
