mirror of
https://github.com/xcat2/xNBA.git
synced 2024-12-14 23:31:39 +00:00
Documented the UDP API calls.
This commit is contained in:
Michael Brown
parent
6bcd74b65c
commit
d8f187dc6a
299
src/interface/pxe/pxe_udp.c
Normal file
299
src/interface/pxe/pxe_udp.c
Normal file
@ -0,0 +1,299 @@
|
||||
/** @file
|
||||
*
|
||||
* PXE UDP API
|
||||
*
|
||||
*/
|
||||
|
||||
#include "pxe.h"
|
||||
|
||||
/*
|
||||
* Copyright (C) 2004 Michael Brown <mbrown@fensystems.co.uk>.
|
||||
*
|
||||
* 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 any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
/**
|
||||
* UDP OPEN (#PXENV_UDP_OPEN)
|
||||
*
|
||||
* @v udp_open Pointer to a struct s_PXENV_UDP_OPEN
|
||||
* @v s_PXENV_UDP_OPEN::src_ip IP address of this station, or 0.0.0.0
|
||||
* @ret PXENV_EXIT_SUCCESS Always
|
||||
* @ret s_PXENV_UDP_OPEN::Status PXE status code
|
||||
* @err PXENV_STATUS_UNDI_INVALID_STATE NIC could not be initialised
|
||||
*
|
||||
* Prepares the PXE stack for communication using pxenv_udp_write()
|
||||
* and pxenv_udp_read(). The IP address supplied in
|
||||
* s_PXENV_UDP_OPEN::src_ip will be recorded and used as the local
|
||||
* station's IP address for all further communication, including
|
||||
* communication by means other than pxenv_udp_write() and
|
||||
* pxenv_udp_read(). (If s_PXENV_UDP_OPEN::src_ip is 0.0.0.0, the
|
||||
* local station's IP address will remain unchanged.)
|
||||
*
|
||||
* You can have multiple UDP connections open simultaneously (and
|
||||
* even open concurrently with TFTP connections), provided that
|
||||
*
|
||||
* - they all have the same local IP address, and
|
||||
*
|
||||
* - you take the multiple connections into account when calling
|
||||
* pxenv_udp_read().
|
||||
*
|
||||
* You can call pxenv_udp_open() in real mode, 16-bit protected mode
|
||||
* with a 16-bit stack segment, 16-bit protected mode with a 32-bit
|
||||
* stack segment, or V86 mode. The pxe::StatusCallout field may be
|
||||
* zero even in protected mode.
|
||||
*
|
||||
*/
|
||||
PXENV_EXIT_t pxenv_udp_open ( struct s_PXENV_UDP_OPEN *udp_open ) {
|
||||
DBG ( "PXENV_UDP_OPEN" );
|
||||
ENSURE_READY ( udp_open );
|
||||
|
||||
if ( udp_open->src_ip &&
|
||||
udp_open->src_ip != arptable[ARP_CLIENT].ipaddr.s_addr ) {
|
||||
/* Overwrite our IP address */
|
||||
DBG ( " with new IP %@", udp_open->src_ip );
|
||||
arptable[ARP_CLIENT].ipaddr.s_addr = udp_open->src_ip;
|
||||
}
|
||||
|
||||
udp_open->Status = PXENV_STATUS_SUCCESS;
|
||||
return PXENV_EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
/**
|
||||
* UDP CLOSE (#PXENV_UDP_CLOSE)
|
||||
*
|
||||
* @v udp_close Pointer to a struct s_PXENV_UDP_CLOSE
|
||||
* @ret PXENV_EXIT_SUCCESS Always
|
||||
* @ret s_PXENV_UDP_CLOSE::Status PXE status code
|
||||
* @err None
|
||||
*
|
||||
* Closes a UDP "connection" opened with pxenv_udp_open(). Since UDP
|
||||
* is a connectionless protocol, this is a no-op.
|
||||
*
|
||||
* You can call pxenv_udp_close() even if there is another active UDP
|
||||
* or TFTP connection, since it has no effect on anything.
|
||||
*
|
||||
* You can call pxenv_udp_close() in real mode, 16-bit protected mode
|
||||
* with a 16-bit stack segment, 16-bit protected mode with a 32-bit
|
||||
* stack segment, or V86 mode. The pxe::StatusCallout field may be
|
||||
* zero even in protected mode.
|
||||
*
|
||||
*/
|
||||
PXENV_EXIT_t pxenv_udp_close ( struct s_PXENV_UDP_CLOSE *udp_close __unused ) {
|
||||
DBG ( "PXENV_UDP_CLOSE" );
|
||||
udp_close->Status = PXENV_STATUS_SUCCESS;
|
||||
return PXENV_EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
/**
|
||||
* UDP WRITE (#PXENV_UDP_WRITE)
|
||||
*
|
||||
* @v udp_write Pointer to a struct s_PXENV_UDP_WRITE
|
||||
* @v s_PXENV_UDP_WRITE::ip Destination IP address
|
||||
* @v s_PXENV_UDP_WRITE::gw Gateway IP address, or 0.0.0.0
|
||||
* @v s_PXENV_UDP_WRITE::src_port Source UDP port, or 0
|
||||
* @v s_PXENV_UDP_WRITE::dst_port Destination UDP port
|
||||
* @v s_PXENV_UDP_WRITE::buffer_size Length of the UDP payload
|
||||
* @v s_PXENV_UDP_WRITE::buffer Address of the UDP payload
|
||||
* @ret PXENV_EXIT_SUCCESS Packet was transmitted successfully
|
||||
* @ret PXENV_EXIT_FAILURE Packet could not be transmitter
|
||||
* @ret s_PXENV_UDP_WRITE::Status PXE status code
|
||||
* @err PXENV_STATUS_UNDI_INVALID_STATE NIC could not be initialised
|
||||
* @err PXENV_STATUS_OUT_OF_RESOURCES Packet was too large to transmit
|
||||
* @err other Any error from pxenv_undi_transmit()
|
||||
*
|
||||
* Transmits a single UDP packet. A valid IP and UDP header will be
|
||||
* prepended to the payload in s_PXENV_UDP_WRITE::buffer; the buffer
|
||||
* should not contain precomputed IP and UDP headers, nor should it
|
||||
* contain space allocated for these headers. The first byte of the
|
||||
* buffer will be transmitted as the first byte following the UDP
|
||||
* header.
|
||||
*
|
||||
* If s_PXENV_UDP_WRITE::gw is 0.0.0.0, normal IP routing will take
|
||||
* place (using, for example, the default gateway IP address returned
|
||||
* by the DHCP server).
|
||||
*
|
||||
* If s_PXENV_UDP_WRITE::src_port is 0, port 2069 will be used.
|
||||
*
|
||||
* It is not necessary to call pxenv_udp_open() before using
|
||||
* pxenv_udp_write(), unless you want to change the local station's IP
|
||||
* address. pxenv_udp_write() can be called even if there is another
|
||||
* active UDP or TFTP connection,.
|
||||
*
|
||||
* You can call pxenv_udp_write() in real mode, 16-bit protected mode
|
||||
* with a 16-bit stack segment, 16-bit protected mode with a 32-bit
|
||||
* stack segment, or V86 mode. The pxe::StatusCallout field may be
|
||||
* zero even in protected mode.
|
||||
*
|
||||
* @bug s_PXENV_UDP_WRITE::gw is ignored; the default routing table is
|
||||
* always used.
|
||||
*
|
||||
*/
|
||||
PXENV_EXIT_t pxenv_udp_write ( struct s_PXENV_UDP_WRITE *udp_write ) {
|
||||
uint16_t src_port;
|
||||
uint16_t dst_port;
|
||||
struct udppacket *packet = (struct udppacket *)nic.packet;
|
||||
int packet_size;
|
||||
|
||||
DBG ( "PXENV_UDP_WRITE" );
|
||||
ENSURE_READY ( udp_write );
|
||||
|
||||
/* PXE spec says source port is 2069 if not specified */
|
||||
src_port = ntohs(udp_write->src_port);
|
||||
if ( src_port == 0 ) src_port = 2069;
|
||||
dst_port = ntohs(udp_write->dst_port);
|
||||
DBG ( " %d->%@:%d (%d)", src_port, udp_write->ip, dst_port,
|
||||
udp_write->buffer_size );
|
||||
|
||||
/* FIXME: we ignore the gateway specified, since we're
|
||||
* confident of being able to do our own routing. We should
|
||||
* probably allow for multiple gateways.
|
||||
*/
|
||||
|
||||
/* Copy payload to packet buffer */
|
||||
packet_size = ( (void*)&packet->payload - (void*)packet )
|
||||
+ udp_write->buffer_size;
|
||||
if ( packet_size > ETH_FRAME_LEN ) {
|
||||
udp_write->Status = PXENV_STATUS_OUT_OF_RESOURCES;
|
||||
return PXENV_EXIT_FAILURE;
|
||||
}
|
||||
memcpy ( &packet->payload, SEGOFF16_TO_PTR(udp_write->buffer),
|
||||
udp_write->buffer_size );
|
||||
|
||||
/* Transmit packet */
|
||||
if ( ! udp_transmit ( udp_write->ip, src_port, dst_port,
|
||||
packet_size, packet ) ) {
|
||||
udp_write->Status = errno;
|
||||
return PXENV_EXIT_FAILURE;
|
||||
}
|
||||
|
||||
udp_write->Status = PXENV_STATUS_SUCCESS;
|
||||
return PXENV_EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
/* Utility function for pxenv_udp_read() */
|
||||
static int await_pxe_udp ( int ival __unused, void *ptr,
|
||||
unsigned short ptype __unused,
|
||||
struct iphdr *ip, struct udphdr *udp,
|
||||
struct tcphdr *tcp __unused ) {
|
||||
t_PXENV_UDP_READ *udp_read = (t_PXENV_UDP_READ*)ptr;
|
||||
uint16_t d_port;
|
||||
size_t size;
|
||||
|
||||
/* Ignore non-UDP packets */
|
||||
if ( !udp ) {
|
||||
DBG ( " non-UDP" );
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Check dest_ip */
|
||||
if ( udp_read->dest_ip && ( udp_read->dest_ip != ip->dest.s_addr ) ) {
|
||||
DBG ( " wrong dest IP (got %@, wanted %@)",
|
||||
ip->dest.s_addr, udp_read->dest_ip );
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Check dest_port */
|
||||
d_port = ntohs ( udp_read->d_port );
|
||||
if ( d_port && ( d_port != ntohs(udp->dest) ) ) {
|
||||
DBG ( " wrong dest port (got %d, wanted %d)",
|
||||
ntohs(udp->dest), d_port );
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Copy packet to buffer and fill in information */
|
||||
udp_read->src_ip = ip->src.s_addr;
|
||||
udp_read->s_port = udp->src; /* Both in network order */
|
||||
size = ntohs(udp->len) - sizeof(*udp);
|
||||
/* Workaround: NTLDR expects us to fill these in, even though
|
||||
* PXESPEC clearly defines them as input parameters.
|
||||
*/
|
||||
udp_read->dest_ip = ip->dest.s_addr;
|
||||
udp_read->d_port = udp->dest;
|
||||
DBG ( " %@:%d->%@:%d (%d)",
|
||||
udp_read->src_ip, ntohs(udp_read->s_port),
|
||||
udp_read->dest_ip, ntohs(udp_read->d_port), size );
|
||||
if ( udp_read->buffer_size < size ) {
|
||||
/* PXESPEC: what error code should we actually return? */
|
||||
DBG ( " buffer too small (%d)", udp_read->buffer_size );
|
||||
udp_read->Status = PXENV_STATUS_OUT_OF_RESOURCES;
|
||||
return 0;
|
||||
}
|
||||
memcpy ( SEGOFF16_TO_PTR ( udp_read->buffer ), &udp->payload, size );
|
||||
udp_read->buffer_size = size;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* UDP READ (#PXENV_UDP_READ)
|
||||
*
|
||||
* @v udp_read Pointer to a struct s_PXENV_UDP_READ
|
||||
* @v s_PXENV_UDP_READ::dest_ip Destination IP address, or 0.0.0.0
|
||||
* @v s_PXENV_UDP_READ::d_port Destination UDP port, or 0
|
||||
* @v s_PXENV_UDP_READ::buffer_size Size of the UDP payload buffer
|
||||
* @v s_PXENV_UDP_READ::buffer Address of the UDP payload buffer
|
||||
* @ret PXENV_EXIT_SUCCESS A packet has been received
|
||||
* @ret PXENV_EXIT_FAILURE No packet has been received
|
||||
* @ret s_PXENV_UDP_READ::Status PXE status code
|
||||
* @ret s_PXENV_UDP_READ::src_ip Source IP address
|
||||
* @ret s_PXEND_UDP_READ::dest_ip Destination IP address
|
||||
* @ret s_PXENV_UDP_READ::s_port Source UDP port
|
||||
* @ret s_PXENV_UDP_READ::d_port Destination UDP port
|
||||
* @ret s_PXENV_UDP_READ::buffer_size Length of UDP payload
|
||||
* @err PXENV_STATUS_UNDI_INVALID_STATE NIC could not be initialised
|
||||
* @err PXENV_STATUS_OUT_OF_RESOURCES Buffer was too small for payload
|
||||
* @err PXENV_STATUS_FAILURE No packet was ready to read
|
||||
*
|
||||
* Receive a single UDP packet. This is a non-blocking call; if no
|
||||
* packet is ready to read, the call will return instantly with
|
||||
* s_PXENV_UDP_READ::Status==PXENV_STATUS_FAILURE.
|
||||
*
|
||||
* If s_PXENV_UDP_READ::dest_ip is 0.0.0.0, UDP packets addressed to
|
||||
* any IP address will be accepted and may be returned.
|
||||
*
|
||||
* If s_PXENV_UDP_READ::d_port is 0, UDP packets addressed to any UDP
|
||||
* port will be accepted and may be returned.
|
||||
*
|
||||
* It is not necessary to call pxenv_udp_open() before using
|
||||
* pxenv_udp_read(). pxenv_udp_read() can be called even if there is
|
||||
* another active UDP or TFTP connection, but be aware that you might
|
||||
* then receive (or cause to be lost) a packet belonging to another
|
||||
* connection.
|
||||
*
|
||||
* You can call pxenv_udp_read() in real mode, 16-bit protected mode
|
||||
* with a 16-bit stack segment, 16-bit protected mode with a 32-bit
|
||||
* stack segment, or V86 mode. The pxe::StatusCallout field may be
|
||||
* zero even in protected mode.
|
||||
*
|
||||
* @note The PXE specification (version 2.1) does not state that we
|
||||
* should fill in s_PXENV_UDP_READ::dest_ip and
|
||||
* s_PXENV_UDP_READ::d_port, but Microsoft Windows' NTLDR program
|
||||
* expects us to do so, and will fail if we don't.
|
||||
*
|
||||
*/
|
||||
PXENV_EXIT_t pxenv_udp_read ( struct s_PXENV_UDP_READ *udp_read ) {
|
||||
DBG ( "PXENV_UDP_READ" );
|
||||
ENSURE_READY ( udp_read );
|
||||
|
||||
/* Use await_reply with a timeout of zero */
|
||||
/* Allow await_reply to change Status if necessary */
|
||||
udp_read->Status = PXENV_STATUS_FAILURE;
|
||||
if ( ! await_reply ( await_pxe_udp, 0, udp_read, 0 ) ) {
|
||||
return PXENV_EXIT_FAILURE;
|
||||
}
|
||||
|
||||
udp_read->Status = PXENV_STATUS_SUCCESS;
|
||||
return PXENV_EXIT_SUCCESS;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user