interface.c File Reference

Object interfaces. More...

#include <string.h>
#include <ipxe/interface.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static void	null_intf_close (struct interface *intf __unused, int rc __unused)
	Close null interface. More...
void	intf_plug (struct interface *intf, struct interface *dest)
	Plug an object interface into a new destination object interface. More...
void	intf_plug_plug (struct interface *a, struct interface *b)
	Plug two object interfaces together. More...
void	intf_unplug (struct interface *intf)
	Unplug an object interface. More...
void	intf_nullify (struct interface *intf)
	Ignore all further operations on an object interface. More...
struct interface *	intf_get (struct interface *intf)
	Increment reference count on an object interface. More...
void	intf_put (struct interface *intf)
	Decrement reference count on an object interface. More...
void *	intf_object (struct interface *intf)
	Get pointer to object containing object interface. More...
static struct interface *	intf_get_passthru (struct interface *intf)
	Get pass-through interface. More...
void *	intf_get_dest_op_no_passthru_untyped (struct interface *intf, void *type, struct interface **dest)
	Get object interface destination and operation method (without pass-through) More...
void *	intf_get_dest_op_untyped (struct interface *intf, void *type, struct interface **dest)
	Get object interface destination and operation method. More...
void	intf_close (struct interface *intf, int rc)
	Close an object interface. More...
void	intf_shutdown (struct interface *intf, int rc)
	Shut down an object interface. More...
void	intfs_vshutdown (va_list intfs, int rc)
	Shut down multiple object interfaces. More...
void	intfs_shutdown (int rc,...)
	Shut down multiple object interfaces. More...
void	intf_restart (struct interface *intf, int rc)
	Shut down and restart an object interface. More...
void	intfs_vrestart (va_list intfs, int rc)
	Shut down and restart multiple object interfaces. More...
void	intfs_restart (int rc,...)
	Shut down and restart multiple object interfaces. More...
void	intf_insert (struct interface *intf, struct interface *upper, struct interface *lower)
	Insert a filter interface. More...
void	intf_poke (struct interface *intf, void(type)(struct interface *intf))
	Poke an object interface. More...

Variables
static struct interface_operation	null_intf_op []
	Null interface operations. More...
struct interface_descriptor	null_intf_desc
	Null interface descriptor. More...
struct interface	null_intf = INTF_INIT ( null_intf_desc )
	The null interface. More...

Detailed Description

Object interfaces.

Definition in file interface.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

null_intf_close()

static void null_intf_close ( struct interface *intf  __unused, int rc  __unused  )

static

Close null interface.

Parameters

intf	Null interface
rc	Reason for close

Definition at line 47 of file interface.c.

                                                {

        /* Do nothing.  In particular, do not call intf_restart(),
         * since that would result in an infinite loop.
         */
}

intf_plug()

void intf_plug	(	struct interface *	intf,
		struct interface *	dest
	)

Plug an object interface into a new destination object interface.

Parameters

intf	Object interface
dest	New destination object interface

The reference to the existing destination interface is dropped, a reference to the new destination interface is obtained, and the interface is updated to point to the new destination interface.

Definition at line 83 of file interface.c.

                                                                  {

        if ( intf == &null_intf )
                return;

        DBGC ( INTF_COL ( intf ),
               "INTF " INTF_INTF_FMT " replug to " INTF_FMT "\n",
               INTF_INTF_DBG ( intf, intf->dest ), INTF_DBG ( dest ) );

        intf_get ( dest );
        intf_put ( intf->dest );
        intf->dest = dest;
}

References DBGC, interface::dest, dest, interface::intf, INTF_COL, INTF_DBG, INTF_FMT, intf_get(), INTF_INTF_DBG, INTF_INTF_FMT, intf_put(), and null_intf.

Referenced by intf_plug_plug(), and xfer_vredirect().

intf_plug_plug()

void intf_plug_plug	(	struct interface *	a,
		struct interface *	b
	)

Plug two object interfaces together.

Parameters

a	Object interface A
b	Object interface B

Plugs interface A into interface B, and interface B into interface A. (The basic plug() function is unidirectional; this function is merely a shorthand for two calls to plug(), hence the name.)

Definition at line 107 of file interface.c.

                                                                 {
        intf_plug ( a, b );
        intf_plug ( b, a );
}

References a, b, and intf_plug().

Referenced by aoedev_ata_command(), aoedev_cfg_command(), ata_open(), atadev_command(), create_downloader(), create_pinger(), create_validator(), dns_resolv(), efi_local_open(), fc_els_request(), fc_els_respond(), fc_port_open(), fc_xchg_originate(), fcpdev_scsi_command(), ftp_open(), http_connect(), http_open(), http_transfer_complete(), hw_open(), ib_cmrc_open(), ifpoller_wait(), intf_insert(), ipair_create(), iscsi_scsi_command(), nfs_open(), numeric_resolv(), peerblk_open(), peermux_filter(), ping_open(), resolv(), resolv_setting(), scsi_open(), scsidev_command(), slam_open(), srp_open(), srpdev_scsi_command(), start_dhcp(), start_dhcpv6(), start_ipv6conf(), start_ntp(), start_pxebs(), sync(), tcp_open(), tftp_core_open(), udp_open_common(), usbblk_scsi_command(), and xfer_open_named_socket().

intf_unplug()

void intf_unplug

(

struct interface *

intf

)

Unplug an object interface.

Parameters

intf	Object interface

Definition at line 117 of file interface.c.

                                            {
        DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " unplug\n",
               INTF_INTF_DBG ( intf, intf->dest ) );
        intf_put ( intf->dest );
        intf->dest = &null_intf;
}

References DBGC, interface::dest, interface::intf, INTF_COL, INTF_INTF_DBG, INTF_INTF_FMT, intf_put(), and null_intf.

Referenced by intf_shutdown(), named_resolv_done(), and xfer_vredirect().

intf_nullify()

void intf_nullify

(

struct interface *

intf

)

Ignore all further operations on an object interface.

Parameters

intf	Object interface

Definition at line 129 of file interface.c.

                                             {
        intf->desc = &null_intf_desc;
}

References interface::desc, interface::intf, and null_intf_desc.

Referenced by intf_shutdown(), intfs_vshutdown(), named_resolv_done(), and peermux_close().

intf_get()

struct interface* intf_get

(

struct interface *

intf

)

Increment reference count on an object interface.

Parameters

intf	Object interface

Return values

intf	Object interface

Definition at line 139 of file interface.c.

                                                       {
        ref_get ( intf->refcnt );
        return intf;
}

References interface::intf, ref_get, and interface::refcnt.

Referenced by intf_get_dest_op_no_passthru_untyped(), intf_insert(), and intf_plug().

intf_put()

void intf_put

(

struct interface *

intf

)

Decrement reference count on an object interface.

Parameters

intf	Object interface

Definition at line 149 of file interface.c.

                                         {
        ref_put ( intf->refcnt );
}

References interface::intf, ref_put, and interface::refcnt.

Referenced by acpi_describe(), ata_command(), block_capacity(), block_read(), block_read_capacity(), block_write(), edd_describe(), efi_describe(), identify_device(), intf_close(), intf_get_dest_op_untyped(), intf_insert(), intf_plug(), intf_poke(), intf_unplug(), job_progress(), peerdisc_stat(), resolv_done(), scsi_command(), scsi_response(), xfer_alloc_iob(), xfer_buffer(), xfer_deliver(), xfer_vredirect(), and xfer_window().

intf_object()

void* intf_object

(

struct interface *

intf

)

Get pointer to object containing object interface.

Parameters

intf	Object interface

Return values

object

Containing object

Definition at line 159 of file interface.c.

                                              {
        return ( ( ( void * ) intf ) - intf->desc->offset );
}

References interface::desc, interface::intf, and interface_descriptor::offset.

Referenced by acpi_describe(), ata_command(), block_capacity(), block_read(), block_read_capacity(), block_write(), edd_describe(), efi_describe(), identify_device(), intf_close(), intf_poke(), job_progress(), peerdisc_stat(), resolv_done(), scsi_command(), scsi_response(), xfer_alloc_iob(), xfer_buffer(), xfer_deliver(), xfer_vredirect(), and xfer_window().

intf_get_passthru()

static struct interface* intf_get_passthru ( struct interface *  intf )

static

Get pass-through interface.

Parameters

intf	Object interface

Return values

passthru

Pass-through interface, or NULL

Definition at line 169 of file interface.c.

                                                                       {
        struct interface_descriptor *desc = intf->desc;

        if ( desc->passthru_offset ) {
                return ( ( ( void * ) intf ) + desc->passthru_offset );
        } else {
                return NULL;
        }
}

References desc, interface::desc, and NULL.

Referenced by intf_get_dest_op_untyped().

intf_get_dest_op_no_passthru_untyped()

void* intf_get_dest_op_no_passthru_untyped	(	struct interface *	intf,
		void *	type,
		struct interface **	dest
	)

Get object interface destination and operation method (without pass-through)

Parameters

intf	Object interface
type	Operation type

Return values

dest	Destination interface
func	Implementing method, or NULL

Definition at line 187 of file interface.c.

                                                                        {
        struct interface_descriptor *desc;
        struct interface_operation *op;
        unsigned int i;

        *dest = intf_get ( intf->dest );
        desc = (*dest)->desc;
        for ( i = desc->num_op, op = desc->op ; i ; i--, op++ ) {
                if ( op->type == type )
                        return op->func;
        }

        return NULL;
}

References desc, interface::dest, dest, intf_get(), NULL, op, and type.

Referenced by intf_get_dest_op_untyped().

intf_get_dest_op_untyped()

void* intf_get_dest_op_untyped	(	struct interface *	intf,
		void *	type,
		struct interface **	dest
	)

Get object interface destination and operation method.

Parameters

intf	Object interface
type	Operation type

Return values

dest	Destination interface
func	Implementing method, or NULL

Definition at line 212 of file interface.c.

                                                            {
        void *func;

        while ( 1 ) {

                /* Search for an implementing method provided by the
                 * current destination interface.
                 */
                func = intf_get_dest_op_no_passthru_untyped( intf, type, dest );
                if ( func )
                        return func;

                /* Pass through to the underlying interface, if applicable */
                if ( ! ( intf = intf_get_passthru ( *dest ) ) )
                        return NULL;
                intf_put ( *dest );
        }
}

References dest, interface_operation::func, intf_get_dest_op_no_passthru_untyped(), intf_get_passthru(), intf_put(), NULL, and type.

Referenced by intf_poke().

intf_close()

void intf_close	(	struct interface *	intf,
		int	rc
	)

Close an object interface.

Parameters

intf	Object interface
rc	Reason for close

Note that this function merely informs the destination object that the interface is about to be closed; it doesn't actually disconnect the interface. In most cases, you probably want to use intf_shutdown() or intf_restart() instead.

Definition at line 249 of file interface.c.

                                                   {
        struct interface *dest;
        intf_close_TYPE ( void * ) *op =
                intf_get_dest_op ( intf, intf_close, &dest );
        void *object = intf_object ( dest );

        DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " close (%s)\n",
               INTF_INTF_DBG ( intf, dest ), strerror ( rc ) );

        if ( op ) {
                op ( object, rc );
        } else {
                /* Default is to restart the interface */
                intf_restart ( dest, rc );
        }

        intf_put ( dest );
}

References DBGC, dest, interface::intf, intf_close(), intf_close_TYPE, INTF_COL, intf_get_dest_op, INTF_INTF_DBG, INTF_INTF_FMT, intf_object(), intf_put(), intf_restart(), op, rc, and strerror().

Referenced by ifconf_progress(), iflinkwait_progress(), intf_close(), intf_shutdown(), netdev_close(), sync_progress(), and xfer_vredirect().

intf_shutdown()

void intf_shutdown	(	struct interface *	intf,
		int	rc
	)

Shut down an object interface.

Parameters

intf	Object interface
rc	Reason for close

Blocks further operations from being received via the interface, executes a close operation on the destination interface, and unplugs the interface.

Definition at line 278 of file interface.c.

                                                      {
        struct interface tmp;

        DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " shutting down (%s)\n",
               INTF_DBG ( intf ), strerror ( rc ) );

        /* Block further operations */
        intf_nullify ( intf );

        /* Transfer destination to temporary interface */
        intf_temp_init ( &tmp, intf );
        tmp.dest = intf->dest;
        intf->dest = &null_intf;

        /* Notify destination of close via temporary interface */
        intf_close ( &tmp, rc );

        /* Unplug temporary interface */
        intf_unplug ( &tmp );
}

References DBGC, interface::dest, interface::intf, intf_close(), INTF_COL, INTF_DBG, INTF_FMT, intf_nullify(), intf_temp_init(), intf_unplug(), null_intf, rc, strerror(), and tmp.

Referenced by aoecmd_close(), aoedev_close(), aoedev_config_done(), atacmd_close(), atadev_close(), blktrans_close(), comboot_resolv_close(), dhcp_finished(), dhcpv6_finished(), dns_done(), downloader_finished(), efi_download_close(), efi_local_close(), fc_els_close(), fc_ns_query_close(), fc_peer_close(), fc_port_close(), fc_ulp_close(), fc_xchg_close(), fcoe_close(), fcpcmd_close(), fcpdev_close(), ftp_done(), http_conn_close(), http_transfer_complete(), hw_finished(), ib_cmrc_close(), ib_srp_close(), imux_shutdown(), intf_restart(), intfs_vshutdown(), ipair_close(), ipv6conf_done(), named_close(), nfs_deliver(), nfs_done(), nfs_pm_deliver(), nslookup_close(), ntp_close(), numeric_step(), peerblk_close(), peermux_close(), peermux_info_close(), ping_close(), pinger_close(), posix_file_finished(), pxe_tftp_close(), resmux_close(), slam_finished(), srpcmd_close(), srpdev_close(), tcp_close(), tftp_done(), tls_close(), udp_close(), validator_finished(), and xcm_destroy().

intfs_vshutdown()

void intfs_vshutdown	(	va_list	intfs,
		int	rc
	)

Shut down multiple object interfaces.

Parameters

intfs	Object interfaces
rc	Reason for close

Definition at line 305 of file interface.c.

                                               {
        struct interface *intf;
        va_list tmp;

        /* Nullify all interfaces to avoid potential loops */
        va_copy ( tmp, intfs );
        while ( ( intf = va_arg ( tmp, struct interface * ) ) )
                intf_nullify ( intf );
        va_end ( tmp );

        /* Shut down all interfaces */
        while ( ( intf = va_arg ( intfs, struct interface * ) ) )
                intf_shutdown ( intf, rc );
}

References interface::intf, intf_nullify(), intf_shutdown(), rc, tmp, va_arg, va_copy, and va_end.

Referenced by intfs_shutdown(), and intfs_vrestart().

intfs_shutdown()

void intfs_shutdown	(	int	rc,
			...
	)

Shut down multiple object interfaces.

Parameters

rc	Reason for close
...	Object interfaces

Definition at line 326 of file interface.c.

                                    {
        va_list intfs;

        va_start ( intfs, rc );
        intfs_vshutdown ( intfs, rc );
        va_end ( intfs );
}

References intfs_vshutdown(), rc, va_end, and va_start.

Referenced by http_close(), iscsi_close(), scsicmd_close(), scsidev_close(), and usbblk_remove().

intf_restart()

void intf_restart	(	struct interface *	intf,
		int	rc
	)

Shut down and restart an object interface.

Parameters

intf	Object interface
rc	Reason for close

Shuts down the interface, then unblocks operations that were blocked during shutdown.

Definition at line 343 of file interface.c.

                                                     {

        /* Shut down the interface */
        intf_shutdown ( intf, rc );

        DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " restarting\n",
               INTF_DBG ( intf ) );

        /* Restore the interface descriptor.  Must be done after
         * shutdown (rather than inhibiting intf_shutdown() from
         * nullifying the descriptor) in order to avoid a potential
         * infinite loop as the intf_close() operations on each side
         * of the link call each other recursively.
         */
        intf_reinit ( intf );
}

References DBGC, interface::intf, INTF_COL, INTF_DBG, INTF_FMT, intf_reinit(), intf_shutdown(), and rc.

Referenced by apply_syslog_settings(), apply_syslogs_settings(), efi_pxe_tftp_close(), efi_pxe_udp_close(), fc_peer_plogi(), fc_peer_plogi_done(), fc_port_examine(), fc_port_flogi_done(), fc_port_login(), fc_port_ns_plogi_done(), fc_ulp_examine(), fc_ulp_prli_done(), fcoe_reset(), http_block_read(), http_block_read_capacity(), http_conn_close(), http_conn_xfer_close(), http_reopen(), http_transfer_complete(), imux_close(), imux_start_pair(), intf_close(), iscsi_close_connection(), iscsi_command_close(), iscsi_scsi_done(), monojob_close(), netdev_config_close(), netdev_configure(), peerblk_raw_close(), peerblk_raw_open(), peerblk_raw_rx(), peerblk_reset(), peerblk_retrieval_close(), peerblk_retrieval_open(), peerblk_retrieval_rx(), peerdisc_socket_close(), peerdisc_socket_open(), peermux_block_close(), pxenv_udp_close(), pxenv_udp_open(), resmux_child_close(), sandev_command_close(), sanpath_close(), scsicmd_done(), scsidev_ready(), syslogs_close(), tftp_reopen(), tftp_reopen_mc(), tftp_timer_expired(), tls_validator_done(), usbblk_stop(), validator_start_download(), validator_start_ocsp(), validator_xfer_close(), xcm_close(), xcm_reopen(), and xfer_vreopen().

intfs_vrestart()

void intfs_vrestart	(	va_list	intfs,
		int	rc
	)

Shut down and restart multiple object interfaces.

Parameters

intfs	Object interfaces
rc	Reason for close

Definition at line 366 of file interface.c.

                                              {
        struct interface *intf;
        va_list tmp;

        /* Shut down all interfaces */
        va_copy ( tmp, intfs );
        intfs_vshutdown ( tmp, rc );
        va_end ( tmp );

        /* Reinitialise all interfaces */
        while ( ( intf = va_arg ( intfs, struct interface * ) ) )
                intf_reinit ( intf );
}

References interface::intf, intf_reinit(), intfs_vshutdown(), rc, tmp, va_arg, va_copy, and va_end.

Referenced by intfs_restart().

intfs_restart()

void intfs_restart	(	int	rc,
			...
	)

Shut down and restart multiple object interfaces.

Parameters

rc	Reason for close
...	Object interfaces

Definition at line 386 of file interface.c.

                                   {
        va_list intfs;

        va_start ( intfs, rc );
        intfs_vrestart ( intfs, rc );
        va_end ( intfs );
}

References intfs_vrestart(), rc, va_end, and va_start.

Referenced by http_transfer_complete(), sanpath_close(), and usbblk_scsi_close().

intf_insert()

void intf_insert	(	struct interface *	intf,
		struct interface *	upper,
		struct interface *	lower
	)

Insert a filter interface.

Parameters

intf	Object interface
upper	Upper end of filter
lower	Lower end of filter

Definition at line 401 of file interface.c.

                                             {
        struct interface *dest = intf->dest;

        intf_get ( dest );
        intf_plug_plug ( intf, upper );
        intf_plug_plug ( lower, dest );
        intf_put ( dest );
}

References interface::dest, dest, interface::intf, intf_get(), intf_plug_plug(), and intf_put().

Referenced by add_tls(), and block_translate().

intf_poke()

void intf_poke	(	struct interface *	intf,
		void(type)(struct interface *intf)
	)

Poke an object interface.

Parameters

intf	Object interface
type	Operation type

This is a helper function to implement methods which take no parameters and return nothing.

Definition at line 420 of file interface.c.

                                                            {
        struct interface *dest;
        intf_poke_TYPE ( void * ) *op =
                intf_get_dest_op_untyped ( intf, type, &dest );
        void *object = intf_object ( dest );

        if ( op ) {
                op ( object );
        } else {
                /* Default is to do nothing */
        }

        intf_put ( dest );
}

References dest, interface::intf, intf_get_dest_op_untyped(), intf_object(), intf_poke_TYPE, intf_put(), op, and type.

Referenced by pool_recycle(), pool_reopen(), and xfer_window_changed().

Variable Documentation

null_intf_op

struct interface_operation null_intf_op[]

static

Initial value:

= {
        INTF_OP ( intf_close, struct interface *, null_intf_close ),
}

Null interface operations.

Definition at line 56 of file interface.c.

null_intf_desc

struct interface_descriptor null_intf_desc

Initial value:

=
        INTF_DESC_PURE ( null_intf_op )

Null interface descriptor.

Definition at line 61 of file interface.c.

Referenced by intf_nullify(), and numeric_resolv().

null_intf

struct interface null_intf = INTF_INIT ( null_intf_desc )

The null interface.

Definition at line 65 of file interface.c.

Referenced by intf_init(), intf_plug(), intf_shutdown(), intf_temp_init(), and intf_unplug().