blob: 07225e9d3be85dc8ad4d027e50aa04f8814b3060 [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 <proto/connection.h>
#include <proto/fd.h>
#include <proto/proto_tcp.h>
#include <proto/session.h>
#include <proto/stream_interface.h>
#ifdef USE_OPENSSL
#include <proto/ssl_sock.h>
#endif
/* 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))
return 0;
/* before engaging there, we clear the new WAIT_* flags so that we can
* more easily detect an EAGAIN condition from anywhere.
*/
conn->flags &= ~(CO_FL_WAIT_DATA|CO_FL_WAIT_ROOM|CO_FL_WAIT_RD|CO_FL_WAIT_WR);
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|CO_FL_WAIT_RD|CO_FL_WAIT_WR)))
goto leave;
if (conn->flags & CO_FL_ACCEPT_PROXY)
if (!conn_recv_proxy(conn, CO_FL_ACCEPT_PROXY))
goto leave;
if (conn->flags & CO_FL_SI_SEND_PROXY)
if (!conn_si_send_proxy(conn, CO_FL_SI_SEND_PROXY))
goto leave;
#ifdef USE_OPENSSL
if (conn->flags & CO_FL_SSL_WAIT_HS)
if (!ssl_sock_handshake(conn, CO_FL_SSL_WAIT_HS))
goto leave;
#endif
}
/* Once we're purely in the data phase, we disable handshake polling */
if (!(conn->flags & CO_FL_POLL_SOCK))
__conn_sock_stop_both(conn);
/* Maybe we need to finish initializing an incoming session. The
* function may fail and cause the connection to be destroyed, thus
* we must not use it anymore and should immediately leave instead.
*/
if ((conn->flags & CO_FL_INIT_SESS) &&
conn_session_complete(conn, CO_FL_INIT_SESS) < 0)
return 0;
/* The data transfer starts here and stops on error and handshakes */
if ((fdtab[fd].ev & (FD_POLL_IN | FD_POLL_HUP | FD_POLL_ERR)) &&
!(conn->flags & (CO_FL_WAIT_RD|CO_FL_WAIT_ROOM|CO_FL_ERROR|CO_FL_HANDSHAKE)))
conn->data->recv(conn);
if ((fdtab[fd].ev & (FD_POLL_OUT | FD_POLL_ERR)) &&
!(conn->flags & (CO_FL_WAIT_WR|CO_FL_WAIT_DATA|CO_FL_ERROR|CO_FL_HANDSHAKE)))
conn->data->send(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) && !(conn->flags & CO_FL_WAIT_WR)) {
/* still waiting for a connection to establish and nothing was
* attempted yet to probe the connection. Then let's retry the
* connect().
*/
if (!tcp_connect_probe(conn))
goto leave;
}
leave:
/* we may need to release the connection which is an embryonic session */
if ((conn->flags & (CO_FL_ERROR|CO_FL_INIT_SESS)) == (CO_FL_ERROR|CO_FL_INIT_SESS)) {
conn->flags |= CO_FL_ERROR;
conn_session_complete(conn, CO_FL_INIT_SESS);
return 0;
}
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;
}
/* Update polling on connection <c>'s file descriptor depending on its current
* state as reported in the connection's CO_FL_CURR_* flags, reports of EAGAIN
* in CO_FL_WAIT_*, and the data layer expectations indicated by CO_FL_DATA_*.
* The connection flags are updated with the new flags at the end of the
* operation.
*/
void conn_update_data_polling(struct connection *c)
{
unsigned int f = c->flags;
/* update read status if needed */
if (unlikely((f & (CO_FL_CURR_RD_ENA|CO_FL_DATA_RD_ENA)) == CO_FL_CURR_RD_ENA)) {
f &= ~(CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL);
fd_stop_recv(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL)) != (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL) &&
(f & (CO_FL_DATA_RD_ENA|CO_FL_WAIT_RD)) == (CO_FL_DATA_RD_ENA|CO_FL_WAIT_RD))) {
f |= (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL);
fd_poll_recv(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_RD_ENA|CO_FL_DATA_RD_ENA)) == CO_FL_DATA_RD_ENA)) {
f |= CO_FL_CURR_RD_ENA;
fd_want_recv(c->t.sock.fd);
}
/* update write status if needed */
if (unlikely((f & (CO_FL_CURR_WR_ENA|CO_FL_DATA_WR_ENA)) == CO_FL_CURR_WR_ENA)) {
f &= ~(CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL);
fd_stop_send(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL)) != (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL) &&
(f & (CO_FL_DATA_WR_ENA|CO_FL_WAIT_WR)) == (CO_FL_DATA_WR_ENA|CO_FL_WAIT_WR))) {
f |= (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL);
fd_poll_send(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_WR_ENA|CO_FL_DATA_WR_ENA)) == CO_FL_DATA_WR_ENA)) {
f |= CO_FL_CURR_WR_ENA;
fd_want_send(c->t.sock.fd);
}
c->flags = f;
}
/* Update polling on connection <c>'s file descriptor depending on its current
* state as reported in the connection's CO_FL_CURR_* flags, reports of EAGAIN
* in CO_FL_WAIT_*, and the sock layer expectations indicated by CO_FL_SOCK_*.
* The connection flags are updated with the new flags at the end of the
* operation.
*/
void conn_update_sock_polling(struct connection *c)
{
unsigned int f = c->flags;
/* update read status if needed */
if (unlikely((f & (CO_FL_CURR_RD_ENA|CO_FL_SOCK_RD_ENA)) == CO_FL_CURR_RD_ENA)) {
f &= ~(CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL);
fd_stop_recv(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL)) != (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL) &&
(f & (CO_FL_SOCK_RD_ENA|CO_FL_WAIT_RD)) == (CO_FL_SOCK_RD_ENA|CO_FL_WAIT_RD))) {
f |= (CO_FL_CURR_RD_ENA|CO_FL_CURR_RD_POL);
fd_poll_recv(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_RD_ENA|CO_FL_SOCK_RD_ENA)) == CO_FL_SOCK_RD_ENA)) {
f |= CO_FL_CURR_RD_ENA;
fd_want_recv(c->t.sock.fd);
}
/* update write status if needed */
if (unlikely((f & (CO_FL_CURR_WR_ENA|CO_FL_SOCK_WR_ENA)) == CO_FL_CURR_WR_ENA)) {
f &= ~(CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL);
fd_stop_send(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL)) != (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL) &&
(f & (CO_FL_SOCK_WR_ENA|CO_FL_WAIT_WR)) == (CO_FL_SOCK_WR_ENA|CO_FL_WAIT_WR))) {
f |= (CO_FL_CURR_WR_ENA|CO_FL_CURR_WR_POL);
fd_poll_send(c->t.sock.fd);
}
else if (unlikely((f & (CO_FL_CURR_WR_ENA|CO_FL_SOCK_WR_ENA)) == CO_FL_SOCK_WR_ENA)) {
f |= CO_FL_CURR_WR_ENA;
fd_want_send(c->t.sock.fd);
}
c->flags = f;
}