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// SPDX-License-Identifier: GPL-2.0+
/*
* NFS support driver - based on etherboot and U-BOOT's tftp.c
*
* Masami Komiya <[email protected]> 2004
*
*/
/* NOTE: the NFS code is heavily inspired by the NetBSD netboot code (read:
* large portions are copied verbatim) as distributed in OSKit 0.97. A few
* changes were necessary to adapt the code to Etherboot and to fix several
* inconsistencies. Also the RPC message preparation is done "by hand" to
* avoid adding netsprintf() which I find hard to understand and use. */
/* NOTE 2: Etherboot does not care about things beyond the kernel image, so
* it loads the kernel image off the boot server (ARP_SERVER) and does not
* access the client root disk (root-path in dhcpd.conf), which would use
* ARP_ROOTSERVER. The root disk is something the operating system we are
* about to load needs to use. This is different from the OSKit 0.97 logic. */
/* NOTE 3: Symlink handling introduced by Anselm M Hoffmeister, 2003-July-14
* If a symlink is encountered, it is followed as far as possible (recursion
* possible, maximum 16 steps). There is no clearing of ".."'s inside the
* path, so please DON'T DO THAT. thx. */
/* NOTE 4: NFSv3 support added by Guillaume GARDET, 2016-June-20.
* NFSv2 is still used by default. But if server does not support NFSv2, then
* NFSv3 is used, if available on NFS server. */
/* NOTE 5: NFSv1 support added by Christian Gmeiner, Thomas Rienoessl,
* September 27, 2018. As of now, NFSv3 is the default choice. If the server
* does not support NFSv3, we fall back to versions 2 or 1. */
#include <display_options.h>
#include <image.h>
#include <log.h>
#include <net.h>
#include <malloc.h>
#include "nfs.h"
#include "nfs-common.h"
#include <time.h>
/**************************************************************************
RPC_LOOKUP - Lookup RPC Port numbers
**************************************************************************/
void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
{
int pktlen;
int sport;
rpc_req_common(rpc_prog, rpc_proc, data, datalen,
(char *)net_tx_packet + net_eth_hdr_size()
+ IP_UDP_HDR_SIZE, &pktlen, &sport);
net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
nfs_our_port, pktlen);
}
/**************************************************************************
Interfaces of U-BOOT
**************************************************************************/
static void nfs_timeout_handler(void)
{
if (++nfs_timeout_count > NFS_RETRY_COUNT) {
puts("\nRetry count exceeded; starting again\n");
net_start_again();
} else {
puts("T ");
net_set_timeout_handler(nfs_timeout +
nfs_timeout * nfs_timeout_count,
nfs_timeout_handler);
nfs_send();
}
}
void nfs_refresh_timeout(void)
{
net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
}
static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
unsigned src, unsigned len)
{
debug("%s\n", __func__);
if (len > sizeof(struct rpc_t))
return;
if (dest != nfs_our_port)
return;
nfs_pkt_recv(pkt, len);
}
void nfs_start(void)
{
debug("%s\n", __func__);
nfs_download_state = NETLOOP_FAIL;
nfs_server_ip = net_server_ip;
nfs_path = (char *)nfs_path_buff;
if (nfs_path == NULL) {
net_set_state(NETLOOP_FAIL);
printf("*** ERROR: Fail allocate memory\n");
return;
}
if (!net_parse_bootfile(&nfs_server_ip, nfs_path,
sizeof(nfs_path_buff))) {
sprintf(nfs_path, "/nfsroot/%02X%02X%02X%02X.img",
net_ip.s_addr & 0xFF,
(net_ip.s_addr >> 8) & 0xFF,
(net_ip.s_addr >> 16) & 0xFF,
(net_ip.s_addr >> 24) & 0xFF);
printf("*** Warning: no boot file name; using '%s'\n",
nfs_path);
}
nfs_filename = nfs_basename(nfs_path);
nfs_path = nfs_dirname(nfs_path);
printf("Using %s device\n", eth_get_name());
printf("File transfer via NFS from server %pI4; our IP address is %pI4",
&nfs_server_ip, &net_ip);
/* Check if we need to send across this subnet */
if (net_gateway.s_addr && net_netmask.s_addr) {
struct in_addr our_net;
struct in_addr server_net;
our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
server_net.s_addr = nfs_server_ip.s_addr & net_netmask.s_addr;
if (our_net.s_addr != server_net.s_addr)
printf("; sending through gateway %pI4",
&net_gateway);
}
printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
if (net_boot_file_expected_size_in_blocks) {
printf(" Size is 0x%x Bytes = ",
net_boot_file_expected_size_in_blocks << 9);
print_size(net_boot_file_expected_size_in_blocks << 9, "");
}
printf("\nLoad address: 0x%lx\nLoading: *\b", image_load_addr);
net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
net_set_udp_handler(nfs_handler);
nfs_timeout_count = 0;
nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
/*nfs_our_port = 4096 + (get_ticks() % 3072);*/
/*FIX ME !!!*/
nfs_our_port = 1000;
/* zero out server ether in case the server ip has changed */
memset(net_server_ethaddr, 0, 6);
nfs_send();
}
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