xfer.c File Reference

Data transfer interfaces. More...

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ipxe/iobuf.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
int	xfer_vredirect (struct interface *intf, int type, va_list args)
	Send redirection event. More...
size_t	xfer_window (struct interface *intf)
	Check flow control window. More...
void	xfer_window_changed (struct interface *intf)
	Report change of flow control window. More...
struct io_buffer *	xfer_alloc_iob (struct interface *intf, size_t len)
	Allocate I/O buffer. More...
int	xfer_deliver (struct interface *intf, struct io_buffer *iobuf, struct xfer_metadata *meta)
	Deliver datagram. More...
int	xfer_redirect (struct interface *intf, int type,...)
	Send redirection event. More...
int	xfer_deliver_iob (struct interface *intf, struct io_buffer *iobuf)
	Deliver datagram as I/O buffer without metadata. More...
int	xfer_deliver_raw_meta (struct interface *intf, const void *data, size_t len, struct xfer_metadata *meta)
	Deliver datagram as raw data. More...
int	xfer_deliver_raw (struct interface *intf, const void *data, size_t len)
	Deliver datagram as raw data without metadata. More...
int	xfer_vprintf (struct interface *intf, const char *format, va_list args)
	Deliver formatted string. More...
int	xfer_printf (struct interface *intf, const char *format,...)
	Deliver formatted string. More...
int	xfer_seek (struct interface *intf, off_t offset)
	Seek to position. More...
int	xfer_check_order (struct xfer_metadata *meta, size_t *pos, size_t len)
	Check that data is delivered strictly in order. More...

Variables
static struct xfer_metadata	dummy_metadata
	Dummy transfer metadata. More...

Detailed Description

Data transfer interfaces.

Definition in file xfer.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

xfer_vredirect()

int xfer_vredirect	(	struct interface *	intf,
		int	type,
		va_list	args
	)

Send redirection event.

Parameters

intf	Data transfer interface
type	New location type
args	Remaining arguments depend upon location type

Return values

rc	Return status code

Definition at line 62 of file xfer.c.

                                                                      {
        struct interface tmp = INTF_INIT ( null_intf_desc );
        struct interface *dest;
        xfer_vredirect_TYPE ( void * ) *op =
                intf_get_dest_op_no_passthru ( intf, xfer_vredirect, &dest );
        void *object = intf_object ( dest );
        int rc;

        DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " redirect\n",
               INTF_INTF_DBG ( intf, dest ) );

        if ( op ) {
                rc = op ( object, type, args );
        } else {
                /* Default is to reopen the interface as instructed,
                 * then send xfer_window_changed() messages to both
                 * new child and parent interfaces.  Since our
                 * original child interface is likely to be closed and
                 * unplugged as a result of the call to
                 * xfer_vreopen(), we create a temporary interface in
                 * order to be able to send xfer_window_changed() to
                 * the parent.
                 *
                 * If redirection fails, then send intf_close() to the
                 * parent interface.
                 */
                intf_plug ( &tmp, dest );
                rc = xfer_vreopen ( dest, type, args );
                if ( rc == 0 ) {
                        xfer_window_changed ( dest );
                        xfer_window_changed ( &tmp );
                } else {
                        intf_close ( &tmp, rc );
                }
                intf_unplug ( &tmp );
        }

        if ( rc != 0 ) {
                DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " redirect "
                       "failed: %s\n", INTF_INTF_DBG ( intf, dest ),
                       strerror ( rc ) );
        }

        intf_put ( dest );
        return rc;
}

References DBGC, dest, intf_close(), INTF_COL, intf_get_dest_op_no_passthru, INTF_INIT, INTF_INTF_DBG, INTF_INTF_FMT, intf_object(), intf_plug(), intf_put(), intf_unplug(), null_intf_desc, op, rc, strerror(), tmp, type, xfer_vredirect(), xfer_vredirect_TYPE, xfer_vreopen(), and xfer_window_changed().

Referenced by xfer_redirect(), and xfer_vredirect().

xfer_window()

size_t xfer_window

(

struct interface *

intf

)

Check flow control window.

Parameters

intf	Data transfer interface

Return values

len	Length of window

Definition at line 115 of file xfer.c.

                                              {
        struct interface *dest;
        xfer_window_TYPE ( void * ) *op =
                intf_get_dest_op ( intf, xfer_window, &dest );
        void *object = intf_object ( dest );
        size_t len;

        if ( op ) {
                len = op ( object );
        } else {
                /* Default is to provide an unlimited window */
                len = ~( ( size_t ) 0 );
        }

        intf_put ( dest );
        return len;
}

References dest, intf_get_dest_op, intf_object(), intf_put(), len, op, xfer_window(), and xfer_window_TYPE.

Referenced by efi_local_step(), fc_port_window_changed(), fcpcmd_send_wrdata(), http_step(), hw_step(), ipair_window_changed(), iscsi_tx_step(), nfs_mount_step(), nfs_pm_step(), nfs_step(), pinger_window_changed(), pxenv_tftp_open(), sanpath_step(), scsidev_step(), scsidev_window(), syslogs_window_changed(), tcp_xmit_sack(), tftp_send_packet(), tftp_send_rrq(), tls_cipherstream_window(), tls_plainstream_window(), tls_tx_step(), xcm_step(), and xfer_window().

xfer_window_changed()

void xfer_window_changed

(

struct interface *

intf

)

Report change of flow control window.

Parameters

intf	Data transfer interface

Note that this method is used to indicate only unsolicited changes in the flow control window. In particular, this method must not be called as part of the response to xfer_deliver(), since that could easily lead to an infinite loop. Callers of xfer_deliver() should assume that the flow control window will have changed without generating an xfer_window_changed() message.

Definition at line 145 of file xfer.c.

                                                    {

        intf_poke ( intf, xfer_window_changed );
}

References intf_poke(), and xfer_window_changed().

Referenced by aoedev_config_done(), fcoe_expired(), fcoe_reset(), fcpdev_examine(), http_step(), ib_cmrc_changed(), iscsi_rx_login_response(), scsidev_ready(), srp_login_rsp(), tcp_rx(), tls_new_finished(), tls_tx_step(), xfer_vredirect(), and xfer_window_changed().

xfer_alloc_iob()

struct io_buffer* xfer_alloc_iob	(	struct interface *	intf,
		size_t	len
	)

Allocate I/O buffer.

Parameters

intf	Data transfer interface
len	I/O buffer payload length

Return values

iobuf

I/O buffer

Definition at line 157 of file xfer.c.

                                                                         {
        struct interface *dest;
        xfer_alloc_iob_TYPE ( void * ) *op =
                intf_get_dest_op ( intf, xfer_alloc_iob, &dest );
        void *object = intf_object ( dest );
        struct io_buffer *iobuf;

        DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " alloc_iob %zd\n",
               INTF_INTF_DBG ( intf, dest ), len );

        if ( op ) {
                iobuf = op ( object, len );
        } else {
                /* Default is to allocate an I/O buffer with no
                 * reserved space.
                 */
                iobuf = alloc_iob ( len );
        }

        if ( ! iobuf ) {
                DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " alloc_iob "
                       "failed\n", INTF_INTF_DBG ( intf, dest ) );
        }

        intf_put ( dest );
        return iobuf;
}

References alloc_iob(), DBGC, dest, INTF_COL, intf_get_dest_op, INTF_INTF_DBG, INTF_INTF_FMT, intf_object(), intf_put(), len, op, xfer_alloc_iob(), and xfer_alloc_iob_TYPE.

Referenced by dhcp_tx(), dhcpv6_tx(), efi_local_step(), efi_pxe_udp_write(), fc_xchg_alloc_iob(), fcpcmd_send_cmnd(), fcpcmd_send_wrdata(), ipair_tx(), iscsi_tx_data_out(), iscsi_tx_login_request(), pinger_expired(), pxenv_udp_write(), slam_tx_nack(), srp_cmd(), srp_login(), tftp_send_ack(), tftp_send_error(), tftp_send_rrq(), tls_send_plaintext(), xfer_alloc_iob(), xfer_deliver_raw_meta(), and xfer_seek().

xfer_deliver()

int xfer_deliver	(	struct interface *	intf,
		struct io_buffer *	iobuf,
		struct xfer_metadata *	meta
	)

Deliver datagram.

Parameters

intf	Data transfer interface
iobuf	Datagram I/O buffer
meta	Data transfer metadata

Return values

rc	Return status code

Definition at line 193 of file xfer.c.

                                                {
        struct interface *dest;
        xfer_deliver_TYPE ( void * ) *op =
                intf_get_dest_op ( intf, xfer_deliver, &dest );
        void *object = intf_object ( dest );
        int rc;

        DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " deliver %zd\n",
               INTF_INTF_DBG ( intf, dest ), iob_len ( iobuf ) );

        if ( op ) {
                rc = op ( object, iobuf, meta );
        } else {
                /* Default is to discard the I/O buffer */
                free_iob ( iobuf );
                rc = -EPIPE;
        }

        if ( rc != 0 ) {
                DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT
                       " deliver failed: %s\n",
                       INTF_INTF_DBG ( intf, dest ), strerror ( rc ) );
        }

        intf_put ( dest );
        return rc;
}

References DBGC, dest, EPIPE, free_iob(), INTF_COL, intf_get_dest_op, INTF_INTF_DBG, INTF_INTF_FMT, intf_object(), intf_put(), iob_len(), meta(), op, rc, strerror(), xfer_deliver(), and xfer_deliver_TYPE.

Referenced by dhcp_tx(), efi_pxe_udp_write(), fc_xchg_rx(), fcpcmd_send_cmnd(), fcpcmd_send_wrdata(), http_conn_socket_deliver(), http_content_deliver(), peerblk_deliver(), peermux_block_deliver(), ping_rx(), pinger_expired(), pxenv_udp_write(), slam_mc_socket_deliver(), tftp_rx_data(), tftp_send_ack(), tftp_send_error(), udp_rx(), xfer_buffer(), xfer_deliver(), xfer_deliver_iob(), xfer_deliver_raw_meta(), and xfer_seek().

xfer_redirect()

int xfer_redirect	(	struct interface *	intf,
		int	type,
			...
	)

Send redirection event.

Parameters

intf	Data transfer interface
type	New location type
...	Remaining arguments depend upon location type

Return values

rc	Return status code

Definition at line 237 of file xfer.c.

                                                            {
        va_list args;
        int rc;

        va_start ( args, type );
        rc = xfer_vredirect ( intf, type, args );
        va_end ( args );
        return rc;
}

References rc, type, va_end, va_start, and xfer_vredirect().

Referenced by http_redirect(), and named_resolv_done().

xfer_deliver_iob()

int xfer_deliver_iob	(	struct interface *	intf,
		struct io_buffer *	iobuf
	)

Deliver datagram as I/O buffer without metadata.

Parameters

intf	Data transfer interface
iobuf	Datagram I/O buffer

Return values

rc	Return status code

Definition at line 254 of file xfer.c.

                                                                         {
        return xfer_deliver ( intf, iobuf, &dummy_metadata );
}

References dummy_metadata, and xfer_deliver().

Referenced by dhcpv6_tx(), efi_local_step(), fc_xchg_tx(), fcoe_rx(), http_rx_chunk_data(), http_rx_transfer_identity(), http_tx_request(), ib_cmrc_complete_recv(), imux_rx_tcp(), ipair_tx(), iscsi_tx_data_out(), iscsi_tx_login_request(), nfs_deliver(), oncrpc_call(), slam_tx_nack(), srp_cmd(), srp_login(), tcp_rx_data(), tftp_send_rrq(), tls_new_data(), and tls_send_plaintext().

xfer_deliver_raw_meta()

int xfer_deliver_raw_meta	(	struct interface *	intf,
		const void *	data,
		size_t	len,
		struct xfer_metadata *	meta
	)

Deliver datagram as raw data.

Parameters

intf	Data transfer interface
data	Data
len	Length of data
meta	Data transfer metadata

Return values

rc	Return status code

Definition at line 267 of file xfer.c.

                                                                     {
        struct io_buffer *iobuf;

        iobuf = xfer_alloc_iob ( intf, len );
        if ( ! iobuf )
                return -ENOMEM;

        memcpy ( iob_put ( iobuf, len ), data, len );
        return xfer_deliver ( intf, iobuf, meta );
}

References data, ENOMEM, iob_put, len, memcpy(), meta(), xfer_alloc_iob(), and xfer_deliver().

Referenced by dns_send_packet(), fc_els_tx(), fc_ns_query_step(), peerdisc_socket_tx(), and xfer_deliver_raw().

xfer_deliver_raw()

int xfer_deliver_raw	(	struct interface *	intf,
		const void *	data,
		size_t	len
	)

Deliver datagram as raw data without metadata.

Parameters

intf	Data transfer interface
data	Data
len	Length of data

Return values

rc	Return status code

Definition at line 287 of file xfer.c.

                                                                              {
        return xfer_deliver_raw_meta ( intf, data, len, &dummy_metadata );
}

References data, dummy_metadata, len, and xfer_deliver_raw_meta().

Referenced by fcoe_fip_rx_els_response(), hw_step(), ib_cmrc_changed(), iscsi_tx_bhs(), ntp_request(), slam_finished(), xcm_step(), xfer_vprintf(), xsmp_tx_session(), and xsmp_tx_xve().

xfer_vprintf()

int xfer_vprintf	(	struct interface *	intf,
		const char *	format,
		va_list	args
	)

Deliver formatted string.

Parameters

intf	Data transfer interface
format	Format string
args	Arguments corresponding to the format string

Return values

rc	Return status code

Definition at line 299 of file xfer.c.

                                  {
        va_list args_tmp;
        char *buf;
        int len;
        int rc;

        /* Create temporary string */
        va_copy ( args_tmp, args );
        len = vasprintf ( &buf, format, args );
        va_end ( args_tmp );
        if ( len < 0 ) {
                rc = len;
                goto err_asprintf;
        }

        /* Transmit string */
        if ( ( rc = xfer_deliver_raw ( intf, buf, len ) ) != 0 )
                goto err_deliver;

 err_deliver:
        free ( buf );
 err_asprintf:
        return rc;
}

References format, free, len, rc, va_copy, va_end, vasprintf(), and xfer_deliver_raw().

Referenced by xfer_printf().

xfer_printf()

int xfer_printf	(	struct interface *	intf,
		const char *	format,
			...
	)

Deliver formatted string.

Parameters

intf	Data transfer interface
format	Format string
...	Arguments corresponding to the format string

Return values

rc	Return status code

Definition at line 333 of file xfer.c.

                                                                    {
        va_list args;
        int rc;

        va_start ( args, format );
        rc = xfer_vprintf ( intf, format, args );
        va_end ( args );
        return rc;
}

References format, rc, va_end, va_start, and xfer_vprintf().

Referenced by ftp_next_state(), and syslog_send().

xfer_seek()

int xfer_seek	(	struct interface *	intf,
		off_t	offset
	)

Seek to position.

Parameters

intf	Data transfer interface
offset	Offset to new position

Return values

rc	Return status code

Definition at line 350 of file xfer.c.

                                                       {
        struct io_buffer *iobuf;
        struct xfer_metadata meta = {
                .flags = XFER_FL_ABS_OFFSET,
                .offset = offset,
        };

        DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " seek to %ld\n",
               INTF_DBG ( intf ), offset );

        /* Allocate and send a zero-length data buffer */
        iobuf = xfer_alloc_iob ( intf, 0 );
        if ( ! iobuf )
                return -ENOMEM;

        return xfer_deliver ( intf, iobuf, &meta );
}

References DBGC, ENOMEM, INTF_COL, INTF_DBG, INTF_FMT, meta(), offset, xfer_alloc_iob(), xfer_deliver(), and XFER_FL_ABS_OFFSET.

Referenced by efi_local_step(), ftp_reply(), http_rx_chunk_len(), http_rx_headers(), nfs_deliver(), peermux_info_close(), slam_pull_header(), and tftp_presize().

xfer_check_order()

int xfer_check_order	(	struct xfer_metadata *	meta,
		size_t *	pos,
		size_t	len
	)

Check that data is delivered strictly in order.

Parameters

meta	Data transfer metadata
pos	Current position
len	Length of data

Return values

rc	Return status code

Definition at line 376 of file xfer.c.

                                                                             {
        size_t new_pos;

        /* Allow out-of-order zero-length packets (as used by xfer_seek()) */
        if ( len == 0 )
                return 0;

        /* Calculate position of this delivery */
        new_pos = *pos;
        if ( meta->flags & XFER_FL_ABS_OFFSET )
                new_pos = 0;
        new_pos += meta->offset;

        /* Fail if delivery position is not equal to current position */
        if ( new_pos != *pos )
                return -EPROTO;

        /* Update current position */
        *pos += len;

        return 0;
}

References EPROTO, len, meta(), and XFER_FL_ABS_OFFSET.

Referenced by peerblk_raw_rx().

Variable Documentation

dummy_metadata

struct xfer_metadata dummy_metadata

static

Dummy transfer metadata.

This gets passed to xfer_interface::deliver() and equivalents when no metadata is available.

Definition at line 46 of file xfer.c.

Referenced by xfer_deliver_iob(), and xfer_deliver_raw().