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u-boot/net/nfs.c

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/*
* NFS support driver - based on etherboot and U-BOOT's tftp.c
*
* Masami Komiya <mkomiya@sonare.it> 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. */
#include <common.h>
#include <command.h>
#include <net.h>
#include <malloc.h>
#include <mapmem.h>
#include "nfs.h"
#include "bootp.h"
#define HASHES_PER_LINE 65 /* Number of "loading" hashes per line */
#define NFS_RETRY_COUNT 30
#ifndef CONFIG_NFS_TIMEOUT
# define NFS_TIMEOUT 2000UL
#else
# define NFS_TIMEOUT CONFIG_NFS_TIMEOUT
#endif
#define NFS_RPC_ERR 1
#define NFS_RPC_DROP 124
static int fs_mounted;
static unsigned long rpc_id;
static int nfs_offset = -1;
static int nfs_len;
static ulong nfs_timeout = NFS_TIMEOUT;
static char dirfh[NFS_FHSIZE]; /* file handle of directory */
static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
static enum net_loop_state nfs_download_state;
static struct in_addr nfs_server_ip;
static int nfs_server_mount_port;
static int nfs_server_port;
static int nfs_our_port;
static int nfs_timeout_count;
static int nfs_state;
#define STATE_PRCLOOKUP_PROG_MOUNT_REQ 1
#define STATE_PRCLOOKUP_PROG_NFS_REQ 2
#define STATE_MOUNT_REQ 3
#define STATE_UMOUNT_REQ 4
#define STATE_LOOKUP_REQ 5
#define STATE_READ_REQ 6
#define STATE_READLINK_REQ 7
static char default_filename[64];
static char *nfs_filename;
static char *nfs_path;
static char nfs_path_buff[2048];
static inline int store_block(uchar *src, unsigned offset, unsigned len)
{
ulong newsize = offset + len;
#ifdef CONFIG_SYS_DIRECT_FLASH_NFS
int i, rc = 0;
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
/* start address in flash? */
if (load_addr + offset >= flash_info[i].start[0]) {
rc = 1;
break;
}
}
if (rc) { /* Flash is destination for this packet */
rc = flash_write((uchar *)src, (ulong)(load_addr+offset), len);
if (rc) {
flash_perror(rc);
return -1;
}
} else
#endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
{
void *ptr = map_sysmem(load_addr + offset, len);
memcpy(ptr, src, len);
unmap_sysmem(ptr);
}
if (net_boot_file_size < (offset + len))
net_boot_file_size = newsize;
return 0;
}
static char *basename(char *path)
{
char *fname;
fname = path + strlen(path) - 1;
while (fname >= path) {
if (*fname == '/') {
fname++;
break;
}
fname--;
}
return fname;
}
static char *dirname(char *path)
{
char *fname;
fname = basename(path);
--fname;
*fname = '\0';
return path;
}
/**************************************************************************
RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
**************************************************************************/
static long *rpc_add_credentials(long *p)
{
int hl;
int hostnamelen;
char hostname[256];
strcpy(hostname, "");
hostnamelen = strlen(hostname);
/* Here's the executive summary on authentication requirements of the
* various NFS server implementations: Linux accepts both AUTH_NONE
* and AUTH_UNIX authentication (also accepts an empty hostname field
* in the AUTH_UNIX scheme). *BSD refuses AUTH_NONE, but accepts
* AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
* scheme). To be safe, use AUTH_UNIX and pass the hostname if we have
* it (if the BOOTP/DHCP reply didn't give one, just use an empty
* hostname). */
hl = (hostnamelen + 3) & ~3;
/* Provide an AUTH_UNIX credential. */
*p++ = htonl(1); /* AUTH_UNIX */
*p++ = htonl(hl+20); /* auth length */
*p++ = htonl(0); /* stamp */
*p++ = htonl(hostnamelen); /* hostname string */
if (hostnamelen & 3)
*(p + hostnamelen / 4) = 0; /* add zero padding */
memcpy(p, hostname, hostnamelen);
p += hl / 4;
*p++ = 0; /* uid */
*p++ = 0; /* gid */
*p++ = 0; /* auxiliary gid list */
/* Provide an AUTH_NONE verifier. */
*p++ = 0; /* AUTH_NONE */
*p++ = 0; /* auth length */
return p;
}
/**************************************************************************
RPC_LOOKUP - Lookup RPC Port numbers
**************************************************************************/
static void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
{
struct rpc_t pkt;
unsigned long id;
uint32_t *p;
int pktlen;
int sport;
id = ++rpc_id;
pkt.u.call.id = htonl(id);
pkt.u.call.type = htonl(MSG_CALL);
pkt.u.call.rpcvers = htonl(2); /* use RPC version 2 */
pkt.u.call.prog = htonl(rpc_prog);
pkt.u.call.vers = htonl(2); /* portmapper is version 2 */
pkt.u.call.proc = htonl(rpc_proc);
p = (uint32_t *)&(pkt.u.call.data);
if (datalen)
memcpy((char *)p, (char *)data, datalen*sizeof(uint32_t));
pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
(char *)&pkt, pktlen);
if (rpc_prog == PROG_PORTMAP)
sport = SUNRPC_PORT;
else if (rpc_prog == PROG_MOUNT)
sport = nfs_server_mount_port;
else
sport = nfs_server_port;
net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
nfs_our_port, pktlen);
}
/**************************************************************************
RPC_LOOKUP - Lookup RPC Port numbers
**************************************************************************/
static void rpc_lookup_req(int prog, int ver)
{
uint32_t data[16];
data[0] = 0; data[1] = 0; /* auth credential */
data[2] = 0; data[3] = 0; /* auth verifier */
data[4] = htonl(prog);
data[5] = htonl(ver);
data[6] = htonl(17); /* IP_UDP */
data[7] = 0;
rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
}
/**************************************************************************
NFS_MOUNT - Mount an NFS Filesystem
**************************************************************************/
static void nfs_mount_req(char *path)
{
uint32_t data[1024];
uint32_t *p;
int len;
int pathlen;
pathlen = strlen(path);
p = &(data[0]);
p = (uint32_t *)rpc_add_credentials((long *)p);
*p++ = htonl(pathlen);
if (pathlen & 3)
*(p + pathlen / 4) = 0;
memcpy(p, path, pathlen);
p += (pathlen + 3) / 4;
len = (uint32_t *)p - (uint32_t *)&(data[0]);
rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
}
/**************************************************************************
NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
**************************************************************************/
static void nfs_umountall_req(void)
{
uint32_t data[1024];
uint32_t *p;
int len;
if ((nfs_server_mount_port == -1) || (!fs_mounted))
/* Nothing mounted, nothing to umount */
return;
p = &(data[0]);
p = (uint32_t *)rpc_add_credentials((long *)p);
len = (uint32_t *)p - (uint32_t *)&(data[0]);
rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
}
/***************************************************************************
* NFS_READLINK (AH 2003-07-14)
* This procedure is called when read of the first block fails -
* this probably happens when it's a directory or a symlink
* In case of successful readlink(), the dirname is manipulated,
* so that inside the nfs() function a recursion can be done.
**************************************************************************/
static void nfs_readlink_req(void)
{
uint32_t data[1024];
uint32_t *p;
int len;
p = &(data[0]);
p = (uint32_t *)rpc_add_credentials((long *)p);
memcpy(p, filefh, NFS_FHSIZE);
p += (NFS_FHSIZE / 4);
len = (uint32_t *)p - (uint32_t *)&(data[0]);
rpc_req(PROG_NFS, NFS_READLINK, data, len);
}
/**************************************************************************
NFS_LOOKUP - Lookup Pathname
**************************************************************************/
static void nfs_lookup_req(char *fname)
{
uint32_t data[1024];
uint32_t *p;
int len;
int fnamelen;
fnamelen = strlen(fname);
p = &(data[0]);
p = (uint32_t *)rpc_add_credentials((long *)p);
memcpy(p, dirfh, NFS_FHSIZE);
p += (NFS_FHSIZE / 4);
*p++ = htonl(fnamelen);
if (fnamelen & 3)
*(p + fnamelen / 4) = 0;
memcpy(p, fname, fnamelen);
p += (fnamelen + 3) / 4;
len = (uint32_t *)p - (uint32_t *)&(data[0]);
rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
}
/**************************************************************************
NFS_READ - Read File on NFS Server
**************************************************************************/
static void nfs_read_req(int offset, int readlen)
{
uint32_t data[1024];
uint32_t *p;
int len;
p = &(data[0]);
p = (uint32_t *)rpc_add_credentials((long *)p);
memcpy(p, filefh, NFS_FHSIZE);
p += (NFS_FHSIZE / 4);
*p++ = htonl(offset);
*p++ = htonl(readlen);
*p++ = 0;
len = (uint32_t *)p - (uint32_t *)&(data[0]);
rpc_req(PROG_NFS, NFS_READ, data, len);
}
/**************************************************************************
RPC request dispatcher
**************************************************************************/
static void nfs_send(void)
{
debug("%s\n", __func__);
switch (nfs_state) {
case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
rpc_lookup_req(PROG_MOUNT, 1);
break;
case STATE_PRCLOOKUP_PROG_NFS_REQ:
rpc_lookup_req(PROG_NFS, 2);
break;
case STATE_MOUNT_REQ:
nfs_mount_req(nfs_path);
break;
case STATE_UMOUNT_REQ:
nfs_umountall_req();
break;
case STATE_LOOKUP_REQ:
nfs_lookup_req(nfs_filename);
break;
case STATE_READ_REQ:
nfs_read_req(nfs_offset, nfs_len);
break;
case STATE_READLINK_REQ:
nfs_readlink_req();
break;
}
}
/**************************************************************************
Handlers for the reply from server
**************************************************************************/
static int rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
{
struct rpc_t rpc_pkt;
memcpy((unsigned char *)&rpc_pkt, pkt, len);
debug("%s\n", __func__);
if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
return -NFS_RPC_ERR;
else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
return -NFS_RPC_DROP;
if (rpc_pkt.u.reply.rstatus ||
rpc_pkt.u.reply.verifier ||
rpc_pkt.u.reply.astatus)
return -1;
switch (prog) {
case PROG_MOUNT:
nfs_server_mount_port = ntohl(rpc_pkt.u.reply.data[0]);
break;
case PROG_NFS:
nfs_server_port = ntohl(rpc_pkt.u.reply.data[0]);
break;
}
return 0;
}
static int nfs_mount_reply(uchar *pkt, unsigned len)
{
struct rpc_t rpc_pkt;
debug("%s\n", __func__);
memcpy((unsigned char *)&rpc_pkt, pkt, len);
if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
return -NFS_RPC_ERR;
else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
return -NFS_RPC_DROP;
if (rpc_pkt.u.reply.rstatus ||
rpc_pkt.u.reply.verifier ||
rpc_pkt.u.reply.astatus ||
rpc_pkt.u.reply.data[0])
return -1;
fs_mounted = 1;
memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
return 0;
}
static int nfs_umountall_reply(uchar *pkt, unsigned len)
{
struct rpc_t rpc_pkt;
debug("%s\n", __func__);
memcpy((unsigned char *)&rpc_pkt, pkt, len);
if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
return -NFS_RPC_ERR;
else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
return -NFS_RPC_DROP;
if (rpc_pkt.u.reply.rstatus ||
rpc_pkt.u.reply.verifier ||
rpc_pkt.u.reply.astatus)
return -1;
fs_mounted = 0;
memset(dirfh, 0, sizeof(dirfh));
return 0;
}
static int nfs_lookup_reply(uchar *pkt, unsigned len)
{
struct rpc_t rpc_pkt;
debug("%s\n", __func__);
memcpy((unsigned char *)&rpc_pkt, pkt, len);
if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
return -NFS_RPC_ERR;
else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
return -NFS_RPC_DROP;
if (rpc_pkt.u.reply.rstatus ||
rpc_pkt.u.reply.verifier ||
rpc_pkt.u.reply.astatus ||
rpc_pkt.u.reply.data[0])
return -1;
memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
return 0;
}
static int nfs_readlink_reply(uchar *pkt, unsigned len)
{
struct rpc_t rpc_pkt;
int rlen;
debug("%s\n", __func__);
memcpy((unsigned char *)&rpc_pkt, pkt, len);
if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
return -NFS_RPC_ERR;
else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
return -NFS_RPC_DROP;
if (rpc_pkt.u.reply.rstatus ||
rpc_pkt.u.reply.verifier ||
rpc_pkt.u.reply.astatus ||
rpc_pkt.u.reply.data[0])
return -1;
rlen = ntohl(rpc_pkt.u.reply.data[1]); /* new path length */
if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
int pathlen;
strcat(nfs_path, "/");
pathlen = strlen(nfs_path);
memcpy(nfs_path + pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]),
rlen);
nfs_path[pathlen + rlen] = 0;
} else {
memcpy(nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
nfs_path[rlen] = 0;
}
return 0;
}
static int nfs_read_reply(uchar *pkt, unsigned len)
{
struct rpc_t rpc_pkt;
int rlen;
debug("%s\n", __func__);
memcpy((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
return -NFS_RPC_ERR;
else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
return -NFS_RPC_DROP;
if (rpc_pkt.u.reply.rstatus ||
rpc_pkt.u.reply.verifier ||
rpc_pkt.u.reply.astatus ||
rpc_pkt.u.reply.data[0]) {
if (rpc_pkt.u.reply.rstatus)
return -9999;
if (rpc_pkt.u.reply.astatus)
return -9999;
return -ntohl(rpc_pkt.u.reply.data[0]);
}
if ((nfs_offset != 0) && !((nfs_offset) %
(NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
puts("\n\t ");
if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
putc('#');
rlen = ntohl(rpc_pkt.u.reply.data[18]);
if (store_block((uchar *)pkt + sizeof(rpc_pkt.u.reply),
nfs_offset, rlen))
return -9999;
return rlen;
}
/**************************************************************************
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();
}
}
static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
unsigned src, unsigned len)
{
int rlen;
int reply;
debug("%s\n", __func__);
if (dest != nfs_our_port)
return;
switch (nfs_state) {
case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
break;
nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
nfs_send();
break;
case STATE_PRCLOOKUP_PROG_NFS_REQ:
if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
break;
nfs_state = STATE_MOUNT_REQ;
nfs_send();
break;
case STATE_MOUNT_REQ:
reply = nfs_mount_reply(pkt, len);
if (reply == -NFS_RPC_DROP) {
break;
} else if (reply == -NFS_RPC_ERR) {
puts("*** ERROR: Cannot mount\n");
/* just to be sure... */
nfs_state = STATE_UMOUNT_REQ;
nfs_send();
} else {
nfs_state = STATE_LOOKUP_REQ;
nfs_send();
}
break;
case STATE_UMOUNT_REQ:
reply = nfs_umountall_reply(pkt, len);
if (reply == -NFS_RPC_DROP) {
break;
} else if (reply == -NFS_RPC_ERR) {
puts("*** ERROR: Cannot umount\n");
net_set_state(NETLOOP_FAIL);
} else {
puts("\ndone\n");
net_set_state(nfs_download_state);
}
break;
case STATE_LOOKUP_REQ:
reply = nfs_lookup_reply(pkt, len);
if (reply == -NFS_RPC_DROP) {
break;
} else if (reply == -NFS_RPC_ERR) {
puts("*** ERROR: File lookup fail\n");
nfs_state = STATE_UMOUNT_REQ;
nfs_send();
} else {
nfs_state = STATE_READ_REQ;
nfs_offset = 0;
nfs_len = NFS_READ_SIZE;
nfs_send();
}
break;
case STATE_READLINK_REQ:
reply = nfs_readlink_reply(pkt, len);
if (reply == -NFS_RPC_DROP) {
break;
} else if (reply == -NFS_RPC_ERR) {
puts("*** ERROR: Symlink fail\n");
nfs_state = STATE_UMOUNT_REQ;
nfs_send();
} else {
debug("Symlink --> %s\n", nfs_path);
nfs_filename = basename(nfs_path);
nfs_path = dirname(nfs_path);
nfs_state = STATE_MOUNT_REQ;
nfs_send();
}
break;
case STATE_READ_REQ:
rlen = nfs_read_reply(pkt, len);
net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
if (rlen > 0) {
nfs_offset += rlen;
nfs_send();
} else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
/* symbolic link */
nfs_state = STATE_READLINK_REQ;
nfs_send();
} else {
if (!rlen)
nfs_download_state = NETLOOP_SUCCESS;
nfs_state = STATE_UMOUNT_REQ;
nfs_send();
}
break;
}
}
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);
puts("*** ERROR: Fail allocate memory\n");
return;
}
if (net_boot_file_name[0] == '\0') {
sprintf(default_filename, "/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);
strcpy(nfs_path, default_filename);
printf("*** Warning: no boot file name; using '%s'\n",
nfs_path);
} else {
char *p = net_boot_file_name;
p = strchr(p, ':');
if (p != NULL) {
nfs_server_ip = string_to_ip(net_boot_file_name);
++p;
strcpy(nfs_path, p);
} else {
strcpy(nfs_path, net_boot_file_name);
}
}
nfs_filename = basename(nfs_path);
nfs_path = 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 = net_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\n"
"Loading: *\b", 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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