ICMP ping protocol. More...

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/refcnt.h>
#include <ipxe/list.h>
#include <ipxe/iobuf.h>
#include <ipxe/tcpip.h>
#include <ipxe/icmp.h>
#include <ipxe/interface.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>
#include <ipxe/netdevice.h>
#include <ipxe/ping.h>

Data Structures
struct	ping_connection
	A ping connection. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)

static	LIST_HEAD (ping_conns)
	List of registered ping connections. More...

static struct ping_connection *	ping_demux (unsigned int port)
	Identify ping connection by local port number. More...

static int	ping_port_available (int port)
	Check if local port number is available. More...

int	ping_rx (struct io_buffer iobuf, struct sockaddr_tcpip st_src)
	Process ICMP ping reply. More...

static struct io_buffer *	ping_alloc_iob (struct ping_connection *ping __unused, size_t len)
	Allocate I/O buffer for ping. More...

static int	ping_deliver (struct ping_connection ping, struct io_buffer iobuf, struct xfer_metadata *meta)
	Deliver datagram as I/O buffer. More...

static void	ping_close (struct ping_connection *ping, int rc)
	Close ping connection. More...

static int	ping_open (struct interface xfer, struct sockaddr peer, struct sockaddr *local)
	Open a ping connection. More...

Variables
static struct interface_operation	ping_xfer_operations []
	Ping data transfer interface operations. More...

static struct interface_descriptor	ping_xfer_desc
	Ping data transfer interface descriptor. More...

struct socket_opener ping_socket_opener	__socket_opener
	Ping socket opener. More...

int	ping_sock_echo = PING_SOCK_ECHO
	Linkage hack. More...

Detailed Description

ICMP ping protocol.

Definition in file ping.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )

◆ LIST_HEAD()

static LIST_HEAD ( ping_conns )

static

List of registered ping connections.

◆ ping_demux()

static struct ping_connection* ping_demux ( unsigned int port )

static

Identify ping connection by local port number.

Parameters

port	Local port number

Return values

ping	Ping connection, or NULL

Definition at line 75 of file ping.c.

                                                                  {
         struct ping_connection *ping;
 
         list_for_each_entry ( ping, &ping_conns, list ) {
                 if ( ping->port == port )
                         return ping;
         }
         return NULL;
 }

References ping_connection::list, list_for_each_entry, NULL, ping(), and port.

Referenced by ping_port_available(), and ping_rx().

◆ ping_port_available()

static int ping_port_available ( int port )

static

Check if local port number is available.

Parameters

port	Local port number

Return values

port	Local port number, or negative error

Definition at line 91 of file ping.c.

                                             {
 
         return ( ping_demux ( port ) ? -EADDRINUSE : port );
 }

References EADDRINUSE, ping_demux(), and port.

Referenced by ping_open().

◆ ping_rx()

int ping_rx	(	struct io_buffer *	iobuf,
		struct sockaddr_tcpip *	st_src
	)

Process ICMP ping reply.

Parameters

iobuf	I/O buffer
st_src	Source address

Return values

rc	Return status code

Definition at line 103 of file ping.c.

                                                                        {
         struct icmp_echo *echo = iobuf->data;
         struct ping_connection *ping;
         struct xfer_metadata meta;
         int rc;
 
         /* Sanity check: should already have been checked by ICMP layer */
         assert ( iob_len ( iobuf ) >= sizeof ( *echo ) );
 
         /* Identify connection */
         ping = ping_demux ( ntohs ( echo->ident ) );
         DBGC ( ping, "PING %p reply id %#04x seq %#04x\n",
                ping, ntohs ( echo->ident ), ntohs ( echo->sequence ) );
         if ( ! ping ) {
                 rc = -ENOTCONN;
                 goto discard;
         }
 
         /* Strip header, construct metadata, and pass data to upper layer */
         iob_pull ( iobuf, sizeof ( *echo ) );
         memset ( &meta, 0, sizeof ( meta ) );
         meta.src = ( ( struct sockaddr * ) st_src );
         meta.flags = XFER_FL_ABS_OFFSET;
         meta.offset = ntohs ( echo->sequence );
         return xfer_deliver ( &ping->xfer, iob_disown ( iobuf ), &meta );
 
  discard:
         free_iob ( iobuf );
         return rc;
 }

References assert(), io_buffer::data, DBGC, echo(), ENOTCONN, free_iob(), iob_disown, iob_len(), iob_pull, memset(), meta(), ntohs, ping(), ping_demux(), rc, xfer_deliver(), and XFER_FL_ABS_OFFSET.

◆ ping_alloc_iob()

static struct io_buffer* ping_alloc_iob	(	struct ping_connection *ping	__unused,
		size_t	len
	)

static

Allocate I/O buffer for ping.

Parameters

ping	Ping connection
len	Payload size

Return values

iobuf I/O buffer, or NULL

Definition at line 142 of file ping.c.

                                                                      {
         size_t header_len;
         struct io_buffer *iobuf;
 
         header_len = ( MAX_LL_NET_HEADER_LEN + sizeof ( struct icmp_echo ) );
         iobuf = alloc_iob ( header_len + len );
         if ( iobuf )
                 iob_reserve ( iobuf, header_len );
         return iobuf;
 }

References alloc_iob(), iob_reserve, len, and MAX_LL_NET_HEADER_LEN.

◆ ping_deliver()

static int ping_deliver	(	struct ping_connection *	ping,
		struct io_buffer *	iobuf,
		struct xfer_metadata *	meta
	)

static

Deliver datagram as I/O buffer.

Parameters

ping	Ping connection
iobuf	I/O buffer
meta	Data transfer metadata

Return values

rc	Return status code

Definition at line 161 of file ping.c.

                                                        {
         struct icmp_echo *echo = iob_push ( iobuf, sizeof ( *echo ) );
         int rc;
 
         /* Construct header */
         memset ( echo, 0, sizeof ( *echo ) );
         echo->ident = htons ( ping->port );
         echo->sequence = htons ( meta->offset );
 
         /* Transmit echo request */
         if ( ( rc = icmp_tx_echo_request ( iob_disown ( iobuf ),
                                            &ping->peer ) ) != 0 ) {
                 DBGC ( ping, "PING %p could not transmit: %s\n",
                        ping, strerror ( rc ) );
                 return rc;
         }
 
         return 0;
 }

References DBGC, echo(), htons, icmp_tx_echo_request(), iob_disown, iob_push, memset(), meta(), ping(), rc, and strerror().

◆ ping_close()

static void ping_close	(	struct ping_connection *	ping,
		int	rc
	)

static

Close ping connection.

Parameters

ping	Ping connection
rc	Reason for close

Definition at line 188 of file ping.c.

                                                                 {
 
         /* Close data transfer interface */
         intf_shutdown ( &ping->xfer, rc );
 
         /* Remove from list of connections and drop list's reference */
         list_del ( &ping->list );
         ref_put ( &ping->refcnt );
 
         DBGC ( ping, "PING %p closed\n", ping );
 }

References DBGC, intf_shutdown(), list_del, ping(), rc, and ref_put.

◆ ping_open()

static int ping_open	(	struct interface *	xfer,
		struct sockaddr *	peer,
		struct sockaddr *	local
	)

static

Open a ping connection.

Parameters

xfer	Data transfer interface
peer	Peer socket address
local	Local socket address, or NULL

Return values

rc	Return status code

Definition at line 219 of file ping.c.

                                                 {
         struct sockaddr_tcpip *st_peer = ( struct sockaddr_tcpip * ) peer;
         struct sockaddr_tcpip *st_local = ( struct sockaddr_tcpip * ) local;
         struct ping_connection *ping;
         int port;
         int rc;
 
         /* Allocate and initialise structure */
         ping = zalloc ( sizeof ( *ping ) );
         if ( ! ping ) {
                 rc = -ENOMEM;
                 goto err_alloc;
         }
         DBGC ( ping, "PING %p allocated\n", ping );
         ref_init ( &ping->refcnt, NULL );
         intf_init ( &ping->xfer, &ping_xfer_desc, &ping->refcnt );
         memcpy ( &ping->peer, st_peer, sizeof ( ping->peer ) );
 
         /* Bind to local port */
         port = tcpip_bind ( st_local, ping_port_available );
         if ( port < 0 ) {
                 rc = port;
                 DBGC ( ping, "PING %p could not bind: %s\n",
                        ping, strerror ( rc ) );
                 goto err_bind;
         }
         ping->port = port;
         DBGC ( ping, "PING %p bound to id %#04x\n", ping, port );
 
         /* Attach parent interface, transfer reference to connection
          * list, and return
          */
         intf_plug_plug ( &ping->xfer, xfer );
         list_add ( &ping->list, &ping_conns );
         return 0;
 
  err_bind:
         ref_put ( &ping->refcnt );
  err_alloc:
         return rc;
 }

References DBGC, ENOMEM, intf_init(), intf_plug_plug(), list_add, memcpy(), NULL, peer, ping(), ping_port_available(), ping_xfer_desc, port, rc, ref_init, ref_put, strerror(), tcpip_bind(), ping_connection::xfer, and zalloc().

Variable Documentation

◆ ping_xfer_operations

struct interface_operation ping_xfer_operations[]

static

Initial value:

= {
        INTF_OP ( xfer_deliver, struct ping_connection *, ping_deliver ),
        INTF_OP ( xfer_alloc_iob, struct ping_connection *, ping_alloc_iob ),
        INTF_OP ( intf_close, struct ping_connection *, ping_close ),
}

Ping data transfer interface operations.

Definition at line 201 of file ping.c.

◆ ping_xfer_desc

struct interface_descriptor ping_xfer_desc

static

Initial value:

=

INTF_DESC ( struct ping_connection, xfer, ping_xfer_operations )

ping_connection

A ping connection.

Definition: ping.c:51

ping_xfer_operations

static struct interface_operation ping_xfer_operations[]

Ping data transfer interface operations.

Definition: ping.c:201

ping_connection::xfer

struct interface xfer

Data transfer interface.

Definition: ping.c:63

INTF_DESC

#define INTF_DESC(object_type, intf, operations)

Define an object interface descriptor.

Definition: interface.h:80

Ping data transfer interface descriptor.

Definition at line 208 of file ping.c.

Referenced by ping_open().

◆ __socket_opener

struct socket_opener ping_socket_opener __socket_opener

Initial value:

= {
        .semantics      = PING_SOCK_ECHO,
        .open           = ping_open,
}

Ping socket opener.

Definition at line 263 of file ping.c.

Data Structures

Functions

Variables

Detailed Description

Function Documentation

◆ FILE_LICENCE()

◆ LIST_HEAD()

◆ ping_demux()

◆ ping_port_available()

◆ ping_rx()

◆ ping_alloc_iob()

◆ ping_deliver()

◆ ping_close()

◆ ping_open()

Variable Documentation

◆ ping_xfer_operations

◆ ping_xfer_desc

◆ __socket_opener