blob: 1eada2d67044fe474f696f47cf0b0f80e15cee71 [file] [log] [blame]
/*
* Connection management functions
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <common/compat.h>
#include <common/config.h>
#include <types/connection.h>
#include <proto/proto_tcp.h>
#include <proto/stream_interface.h>
/* I/O callback for fd-based connections. It calls the read/write handlers
* provided by the connection's sock_ops, which must be valid. It returns 0.
*/
int conn_fd_handler(int fd)
{
struct connection *conn = fdtab[fd].owner;
if (unlikely(!conn))
goto leave;
process_handshake:
/* The handshake callbacks are called in sequence. If either of them is
* missing something, it must enable the required polling at the socket
* layer of the connection. Polling state is not guaranteed when entering
* these handlers, so any handshake handler which does not complete its
* work must explicitly disable events it's not interested in.
*/
while (unlikely(conn->flags & CO_FL_HANDSHAKE)) {
if (unlikely(conn->flags & CO_FL_ERROR))
goto leave;
if (conn->flags & CO_FL_SI_SEND_PROXY)
if (!conn_si_send_proxy(conn, CO_FL_SI_SEND_PROXY))
goto leave;
}
/* Once we're purely in the data phase, we disable handshake polling */
if (!(conn->flags & CO_FL_POLL_SOCK))
__conn_sock_stop_both(conn);
if (fdtab[fd].ev & (FD_POLL_IN | FD_POLL_HUP | FD_POLL_ERR))
conn->data->read(conn);
if (unlikely(conn->flags & CO_FL_ERROR))
goto leave;
/* It may happen during the data phase that a handshake is
* enabled again (eg: SSL)
*/
if (unlikely(conn->flags & CO_FL_HANDSHAKE))
goto process_handshake;
if (fdtab[fd].ev & (FD_POLL_OUT | FD_POLL_ERR))
conn->data->write(conn);
if (unlikely(conn->flags & CO_FL_ERROR))
goto leave;
/* It may happen during the data phase that a handshake is
* enabled again (eg: SSL)
*/
if (unlikely(conn->flags & CO_FL_HANDSHAKE))
goto process_handshake;
if (unlikely(conn->flags & CO_FL_WAIT_L4_CONN)) {
/* still waiting for a connection to establish and no data to
* send in order to probe it ? Then let's retry the connect().
*/
if (!tcp_connect_probe(conn))
goto leave;
}
leave:
if (conn->flags & CO_FL_NOTIFY_SI)
conn_notify_si(conn);
/* Last check, verify if the connection just established */
if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED))))
conn->flags |= CO_FL_CONNECTED;
/* remove the events before leaving */
fdtab[fd].ev &= ~(FD_POLL_IN | FD_POLL_OUT | FD_POLL_HUP | FD_POLL_ERR);
/* commit polling changes */
conn_cond_update_polling(conn);
return 0;
}
/* set polling depending on the change between the CURR part of the
* flags and the new flags in connection C. The connection flags are
* updated with the new flags at the end of the operation. Only the bits
* relevant to CO_FL_CURR_* from <flags> are considered.
*/
void conn_set_polling(struct connection *c, unsigned int new)
{
unsigned int old = c->flags; /* for CO_FL_CURR_* */
/* update read status if needed */
if ((old & (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL)) != (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL) &&
(new & (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL)) == (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL))
fd_poll_recv(c->t.sock.fd);
else if (!(old & CO_FL_CURR_RD_ENA) && (new & CO_FL_CURR_RD_ENA))
fd_want_recv(c->t.sock.fd);
else if ((old & CO_FL_CURR_RD_ENA) && !(new & CO_FL_CURR_RD_ENA))
fd_stop_recv(c->t.sock.fd);
/* update write status if needed */
if ((old & (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL)) != (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL) &&
(new & (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL)) == (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL))
fd_poll_send(c->t.sock.fd);
else if (!(old & CO_FL_CURR_WR_ENA) && (new & CO_FL_CURR_WR_ENA))
fd_want_send(c->t.sock.fd);
else if ((old & CO_FL_CURR_WR_ENA) && !(new & CO_FL_CURR_WR_ENA))
fd_stop_send(c->t.sock.fd);
c->flags &= ~(CO_FL_CURR_WR_POL|CO_FL_CURR_WR_ENA|CO_FL_CURR_RD_POL|CO_FL_CURR_RD_ENA);
c->flags |= new & (CO_FL_CURR_WR_POL|CO_FL_CURR_WR_ENA|CO_FL_CURR_RD_POL|CO_FL_CURR_RD_ENA);
}