diff options
Diffstat (limited to 'net/nfs.c')
| -rw-r--r-- | net/nfs.c | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/net/nfs.c b/net/nfs.c new file mode 100644 index 0000000..6f4a06a --- /dev/null +++ b/net/nfs.c @@ -0,0 +1,772 @@ +/* + * 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 "nfs.h" +#include "bootp.h" + +/*#define NFS_DEBUG*/ + +#if ((CONFIG_COMMANDS & CFG_CMD_NET) && (CONFIG_COMMANDS & CFG_CMD_NFS)) + +#define HASHES_PER_LINE 65 /* Number of "loading" hashes per line */ +#define NFS_TIMEOUT 10 + +static int fs_mounted = 0; +static unsigned long rpc_id; +static int nfs_offset = -1; +static int nfs_len; + +static char dirfh[NFS_FHSIZE]; /* file handle of directory */ +static char filefh[NFS_FHSIZE]; /* file handle of kernel image */ + +static IPaddr_t NfsServerIP; +static int NfsSrvMountPort; +static int NfsSrvNfsPort; +static int NfsOurPort; +static int NfsTimeoutCount; +static int NfsState; +#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__ void +store_block (uchar * src, unsigned offset, unsigned len) +{ +#ifdef CFG_DIRECT_FLASH_NFS + int i, rc = 0; + + for (i=0; i<CFG_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); + NetState = NETLOOP_FAIL; + return; + } + } else +#endif /* CFG_DIRECT_FLASH_NFS */ + + { + (void)memcpy ((void *)(load_addr + offset), src, len); + } +} + +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_INIT - set up the ID counter to something fairly random +**************************************************************************/ +static void +rpc_init (void) +{ + unsigned long t; + t=get_ticks(); + rpc_id = t ^ (t << 8) ^ (t << 16); +} + +/************************************************************************** +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 *)NetTxPacket+ETHER_HDR_SIZE+IP_HDR_SIZE, (char *)&pkt, pktlen); + + if (rpc_prog == PROG_PORTMAP) + sport = SUNRPC_PORT; + else if (rpc_prog == PROG_MOUNT) + sport = NfsSrvMountPort; + else + sport = NfsSrvNfsPort; + + NetSendUDPPacket (NetServerEther, NfsServerIP, sport, NfsOurPort, 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 ((NfsSrvMountPort == -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 +NfsSend (void) +{ +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + switch (NfsState) { + 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); + +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + if (rpc_pkt.u.reply.rstatus || + rpc_pkt.u.reply.verifier || + rpc_pkt.u.reply.astatus || + rpc_pkt.u.reply.astatus) { + } + + switch (prog) { + case PROG_MOUNT: + NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]); + break; + case PROG_NFS: + NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]); + break; + } + + return 0; +} + +static int +nfs_mount_reply (uchar *pkt, unsigned len) +{ + struct rpc_t rpc_pkt; + +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + memcpy ((unsigned char *)&rpc_pkt, pkt, len); + + 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; + +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + memcpy ((unsigned char *)&rpc_pkt, pkt, len); + + 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; + +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + memcpy ((unsigned char *)&rpc_pkt, pkt, len); + + 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; + +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + memcpy ((unsigned char *)&rpc_pkt, pkt, len); + + 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+1] = 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; + +#ifdef NFS_DEBUG_nop + printf ("%s\n", __FUNCTION__); +#endif + + rlen = (uchar *)&(rpc_pkt.u.reply.data[19]) - (uchar *)&(rpc_pkt.u.reply.id); + memcpy ((uchar *)&rpc_pkt, pkt, rlen); + + 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]); + store_block ((uchar *)&(rpc_pkt.u.reply.data[19]), nfs_offset, rlen); + + return rlen; +} + +/************************************************************************** +Interfaces of U-BOOT +**************************************************************************/ + +static void +NfsHandler (uchar *pkt, unsigned dest, unsigned src, unsigned len) +{ + int rlen; + +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + if (dest != NfsOurPort) return; + + switch (NfsState) { + case STATE_PRCLOOKUP_PROG_MOUNT_REQ: + rpc_lookup_reply (PROG_MOUNT, pkt, len); + NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ; + NfsSend (); + break; + + case STATE_PRCLOOKUP_PROG_NFS_REQ: + rpc_lookup_reply (PROG_NFS, pkt, len); + NfsState = STATE_MOUNT_REQ; + NfsSend (); + break; + + case STATE_MOUNT_REQ: + if (nfs_mount_reply(pkt, len)) { + puts ("*** ERROR: Cannot mount\n"); + /* just to be sure... */ + NfsState = STATE_UMOUNT_REQ; + NfsSend (); + } else { + NfsState = STATE_LOOKUP_REQ; + NfsSend (); + } + break; + + case STATE_UMOUNT_REQ: + if (nfs_umountall_reply(pkt, len)) { + puts ("*** ERROR: Cannot umount\n"); + NetState = NETLOOP_FAIL; + } else { + NetState = NETLOOP_SUCCESS; + } + break; + + case STATE_LOOKUP_REQ: + if (nfs_lookup_reply(pkt, len)) { + puts ("*** ERROR: File lookup fail\n"); + NfsState = STATE_UMOUNT_REQ; + NfsSend (); + } else { + NfsState = STATE_READ_REQ; + nfs_offset = 0; + nfs_len = NFS_READ_SIZE; + NfsSend (); + } + break; + + case STATE_READLINK_REQ: + if (nfs_readlink_reply(pkt, len)) { + puts ("*** ERROR: Symlink fail\n"); + NfsState = STATE_UMOUNT_REQ; + NfsSend (); + } else { +#ifdef NFS_DEBUG + printf ("Symlink --> %s\n", nfs_path); +#endif + nfs_filename = basename (nfs_path); + nfs_path = dirname (nfs_path); + + NfsState = STATE_MOUNT_REQ; + NfsSend (); + } + break; + + case STATE_READ_REQ: + rlen = nfs_read_reply (pkt, len); + if (rlen > 0) { + nfs_offset += rlen; + NfsSend (); + } + else if ((rlen == -NFSERR_ISDIR)||(rlen == -NFSERR_INVAL)) { + /* symbolic link */ + NfsState = STATE_READLINK_REQ; + NfsSend (); + } else { + puts ("\ndone\n"); + printf ("Bytes transferred = %d (%x hex)\n", + nfs_offset, nfs_offset); + NfsState = STATE_UMOUNT_REQ; + NfsSend (); + } + break; + } +} + +static void +NfsTimeout (void) +{ + puts ("Timeout\n"); + NetState = NETLOOP_FAIL; + return; +} + +void +NfsStart (void) +{ +#ifdef NFS_DEBUG + printf ("%s\n", __FUNCTION__); +#endif + + NfsServerIP = NetServerIP; + nfs_path = (char *)nfs_path_buff; + + if (nfs_path == NULL) { + NetState = NETLOOP_FAIL; + puts ("*** ERROR: Fail allocate memory\n"); + return; + } + + if (BootFile[0] == '\0') { + IPaddr_t OurIP = ntohl (NetOurIP); + + sprintf (default_filename, "/nfsroot/%02lX%02lX%02lX%02lX.img", + OurIP & 0xFF, + (OurIP >> 8) & 0xFF, + (OurIP >> 16) & 0xFF, + (OurIP >> 24) & 0xFF ); + strcpy (nfs_path, default_filename); + + printf ("*** Warning: no boot file name; using '%s'\n", + nfs_path); + } else { + char *p=BootFile; + + p = strchr (p, ':'); + + if (p != NULL) { + NfsServerIP = string_to_ip (BootFile); + ++p; + strcpy (nfs_path, p); + } else { + strcpy (nfs_path, BootFile); + } + } + + nfs_filename = basename (nfs_path); + nfs_path = dirname (nfs_path); + +#if defined(CONFIG_NET_MULTI) + printf ("Using %s device\n", eth_get_name()); +#endif + + puts ("File transfer via NFS from server "); print_IPaddr (NfsServerIP); + puts ("; our IP address is "); print_IPaddr (NetOurIP); + + /* Check if we need to send across this subnet */ + if (NetOurGatewayIP && NetOurSubnetMask) { + IPaddr_t OurNet = NetOurIP & NetOurSubnetMask; + IPaddr_t ServerNet = NetServerIP & NetOurSubnetMask; + + if (OurNet != ServerNet) { + puts ("; sending through gateway "); + print_IPaddr (NetOurGatewayIP) ; + } + } + putc ('\n'); + + printf ("Filename '%s/%s'.", nfs_path, nfs_filename); + + if (NetBootFileSize) { + printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9); + print_size (NetBootFileSize<<9, ""); + } + putc ('\n'); + + printf ("Load address: 0x%lx\n", load_addr); + + printf ("Loading: *\b"); + + NetSetTimeout (NFS_TIMEOUT * CFG_HZ, NfsTimeout); + NetSetHandler (NfsHandler); + + rpc_init (); + NfsTimeoutCount = 0; + NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ; + + /*NfsOurPort = 4096 + (get_ticks() % 3072);*/ + /*FIX ME !!!*/ + NfsOurPort = 1000; + + /* zero out server ether in case the server ip has changed */ + memset (NetServerEther, 0, 6); + + NfsSend (); +} + +#endif /* CONFIG_COMMANDS & CFG_CMD_NFS */ |