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/*
* Pass-through mux-demux for connections
*
* Copyright 2017 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/config.h>
#include <proto/connection.h>
#include <proto/stream.h>
/* Initialize the mux once it's attached. It is expected that conn->mux_ctx
* points to the existing conn_stream (for outgoing connections) or NULL (for
* incoming ones, in which case one will be allocated and a new stream will be
* instanciated). Returns < 0 on error.
*/
static int mux_pt_init(struct connection *conn)
{
struct conn_stream *cs = conn->mux_ctx;
if (!cs) {
cs = cs_new(conn);
if (!cs)
goto fail;
if (stream_create_from_cs(cs) < 0)
goto fail_free;
conn->mux_ctx = cs;
}
return 0;
fail_free:
cs_free(cs);
fail:
return -1;
}
/* callback to be used by default for the pass-through mux. It calls the data
* layer wake() callback if it is set otherwise returns 0.
*/
static int mux_pt_wake(struct connection *conn)
{
struct conn_stream *cs = conn->mux_ctx;
int ret;
ret = cs->data_cb->wake ? cs->data_cb->wake(cs) : 0;
/* If we had early data, and we're done with the handshake
* then whe know the data are safe, and we can remove the flag.
*/
if ((conn->flags & (CO_FL_EARLY_DATA | CO_FL_EARLY_SSL_HS | CO_FL_HANDSHAKE)) ==
CO_FL_EARLY_DATA)
conn->flags &= ~CO_FL_EARLY_DATA;
if (ret >= 0)
cs_update_mux_polling(cs);
return ret;
}
/* callback used to update the mux's polling flags after changing a cs' status.
* The caller (cs_mux_update_poll) will take care of propagating any changes to
* the transport layer.
*/
static void mux_pt_update_poll(struct conn_stream *cs)
{
struct connection *conn = cs->conn;
int flags = 0;
conn_refresh_polling_flags(conn);
if (cs->flags & CS_FL_DATA_RD_ENA)
flags |= CO_FL_XPRT_RD_ENA;
if (cs->flags & CS_FL_DATA_WR_ENA)
flags |= CO_FL_XPRT_WR_ENA;
conn->flags = (conn->flags & ~(CO_FL_XPRT_RD_ENA | CO_FL_XPRT_WR_ENA)) | flags;
conn_cond_update_xprt_polling(conn);
}
/* callback to be used by default for the pass-through mux. It simply calls the
* data layer recv() callback much must be set.
*/
static void mux_pt_recv(struct connection *conn)
{
struct conn_stream *cs = conn->mux_ctx;
if (conn->flags & CO_FL_ERROR)
cs->flags |= CS_FL_ERROR;
if (conn_xprt_read0_pending(conn))
cs->flags |= CS_FL_EOS;
cs->data_cb->recv(cs);
cs_update_mux_polling(cs);
}
/* callback to be used by default for the pass-through mux. It simply calls the
* data layer send() callback which must be set.
*/
static void mux_pt_send(struct connection *conn)
{
struct conn_stream *cs = conn->mux_ctx;
if (conn->flags & CO_FL_ERROR)
cs->flags |= CS_FL_ERROR;
cs->data_cb->send(cs);
cs_update_mux_polling(cs);
}
/*
* Attach a new stream to a connection
* (Used for outgoing connections)
*/
static struct conn_stream *mux_pt_attach(struct connection *conn)
{
return NULL;
}
/*
* Detach the stream from the connection and possibly release the connection.
*/
static void mux_pt_detach(struct conn_stream *cs)
{
struct connection *conn = cs->conn;
LIST_DEL(&conn->list);
conn_stop_tracking(conn);
conn_full_close(conn);
if (conn->destroy_cb)
conn->destroy_cb(conn);
conn_free(conn);
}
static void mux_pt_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
{
if (cs->flags & CS_FL_SHR)
return;
if (conn_xprt_ready(cs->conn) && cs->conn->xprt->shutr)
cs->conn->xprt->shutr(cs->conn, (mode == CS_SHR_DRAIN));
if (cs->flags & CS_FL_SHW)
conn_full_close(cs->conn);
}
static void mux_pt_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
{
if (cs->flags & CS_FL_SHW)
return;
if (conn_xprt_ready(cs->conn) && cs->conn->xprt->shutw)
cs->conn->xprt->shutw(cs->conn, (mode == CS_SHW_NORMAL));
if (!(cs->flags & CS_FL_SHR))
conn_sock_shutw(cs->conn);
else
conn_full_close(cs->conn);
}
/*
* Called from the upper layer, to get more data
*/
static int mux_pt_rcv_buf(struct conn_stream *cs, struct buffer *buf, int count)
{
int ret;
ret = cs->conn->xprt->rcv_buf(cs->conn, buf, count);
if (conn_xprt_read0_pending(cs->conn))
cs->flags |= CS_FL_EOS;
if (cs->conn->flags & CO_FL_ERROR)
cs->flags |= CS_FL_ERROR;
return (ret);
}
/* Called from the upper layer, to send data */
static int mux_pt_snd_buf(struct conn_stream *cs, struct buffer *buf, int flags)
{
return (cs->conn->xprt->snd_buf(cs->conn, buf, flags));
}
#if defined(CONFIG_HAP_LINUX_SPLICE)
/* Send and get, using splicing */
static int mux_pt_rcv_pipe(struct conn_stream *cs, struct pipe *pipe, unsigned int count)
{
int ret;
ret = cs->conn->xprt->rcv_pipe(cs->conn, pipe, count);
if (conn_xprt_read0_pending(cs->conn))
cs->flags |= CS_FL_EOS;
if (cs->conn->flags & CO_FL_ERROR)
cs->flags |= CS_FL_ERROR;
return (ret);
}
static int mux_pt_snd_pipe(struct conn_stream *cs, struct pipe *pipe)
{
return (cs->conn->xprt->snd_pipe(cs->conn, pipe));
}
#endif
/* The mux operations */
const struct mux_ops mux_pt_ops = {
.init = mux_pt_init,
.recv = mux_pt_recv,
.send = mux_pt_send,
.wake = mux_pt_wake,
.update_poll = mux_pt_update_poll,
.rcv_buf = mux_pt_rcv_buf,
.snd_buf = mux_pt_snd_buf,
#if defined(CONFIG_HAP_LINUX_SPLICE)
.rcv_pipe = mux_pt_rcv_pipe,
.snd_pipe = mux_pt_snd_pipe,
#endif
.attach = mux_pt_attach,
.detach = mux_pt_detach,
.shutr = mux_pt_shutr,
.shutw = mux_pt_shutw,
.flags = MX_FL_NONE,
.name = "PASS",
};
/* ALPN selection : default mux has empty name */
static struct alpn_mux_list alpn_mux_pt =
{ .token = IST(""), .mode = ALPN_MODE_ANY, .mux = &mux_pt_ops };
__attribute__((constructor))
static void __mux_pt_init(void)
{
alpn_register_mux(&alpn_mux_pt);
}