Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
734 lines
16 KiB
C
734 lines
16 KiB
C
/*
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* NFS support driver - based on etherboot and barebox's tftp.c
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*
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* Masami Komiya <mkomiya@sonare.it> 2004
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*
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*/
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/* NOTE: the NFS code is heavily inspired by the NetBSD netboot code (read:
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* large portions are copied verbatim) as distributed in OSKit 0.97. A few
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* changes were necessary to adapt the code to Etherboot and to fix several
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* inconsistencies. Also the RPC message preparation is done "by hand" to
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* avoid adding netsprintf() which I find hard to understand and use. */
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/* NOTE 2: Etherboot does not care about things beyond the kernel image, so
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* it loads the kernel image off the boot server (ARP_SERVER) and does not
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* access the client root disk (root-path in dhcpd.conf), which would use
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* ARP_ROOTSERVER. The root disk is something the operating system we are
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* about to load needs to use. This is different from the OSKit 0.97 logic. */
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/* NOTE 3: Symlink handling introduced by Anselm M Hoffmeister, 2003-July-14
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* If a symlink is encountered, it is followed as far as possible (recursion
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* possible, maximum 16 steps). There is no clearing of ".."'s inside the
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* path, so please DON'T DO THAT. thx. */
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#include <common.h>
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#include <command.h>
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#include <clock.h>
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#include <net.h>
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#include <malloc.h>
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#include <libgen.h>
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#include <fs.h>
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#include <libgen.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <progress.h>
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#include <linux/err.h>
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#define SUNRPC_PORT 111
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#define PROG_PORTMAP 100000
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#define PROG_NFS 100003
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#define PROG_MOUNT 100005
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#define MSG_CALL 0
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#define MSG_REPLY 1
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#define PORTMAP_GETPORT 3
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#define MOUNT_ADDENTRY 1
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#define MOUNT_UMOUNTALL 4
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#define NFS_LOOKUP 4
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#define NFS_READLINK 5
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#define NFS_READ 6
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#define NFS_FHSIZE 32
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enum nfs_stat {
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NFS_OK = 0,
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NFSERR_PERM = 1,
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NFSERR_NOENT = 2,
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NFSERR_IO = 5,
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NFSERR_NXIO = 6,
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NFSERR_ACCES = 13,
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NFSERR_EXIST = 17,
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NFSERR_NODEV = 19,
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NFSERR_NOTDIR = 20,
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NFSERR_ISDIR = 21,
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NFSERR_FBIG = 27,
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NFSERR_NOSPC = 28,
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NFSERR_ROFS = 30,
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NFSERR_NAMETOOLONG=63,
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NFSERR_NOTEMPTY = 66,
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NFSERR_DQUOT = 69,
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NFSERR_STALE = 70,
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NFSERR_WFLUSH = 99,
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};
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/* Block size used for NFS read accesses. A RPC reply packet (including all
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* headers) must fit within a single Ethernet frame to avoid fragmentation.
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* Chosen to be a power of two, as most NFS servers are optimized for this. */
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#define NFS_READ_SIZE 1024
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struct rpc_call {
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uint32_t id;
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uint32_t type;
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uint32_t rpcvers;
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uint32_t prog;
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uint32_t vers;
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uint32_t proc;
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uint32_t data[0];
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};
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struct rpc_reply {
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uint32_t id;
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uint32_t type;
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uint32_t rstatus;
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uint32_t verifier;
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uint32_t v2;
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uint32_t astatus;
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uint32_t data[0];
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};
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struct rpc_t {
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union {
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struct {
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uint32_t id;
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uint32_t type;
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uint32_t rpcvers;
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uint32_t prog;
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uint32_t vers;
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uint32_t proc;
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uint32_t data[1];
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} call;
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struct {
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uint32_t id;
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uint32_t type;
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uint32_t rstatus;
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uint32_t verifier;
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uint32_t v2;
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uint32_t astatus;
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uint32_t data[19];
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} reply;
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} u;
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};
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#define NFS_TIMEOUT 15
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static unsigned long rpc_id = 0;
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static int nfs_offset = -1;
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static uint64_t nfs_timer_start;
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static int nfs_err;
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static char dirfh[NFS_FHSIZE]; /* file handle of directory */
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static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
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static int nfs_server_mount_port;
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static int nfs_server_nfs_port;
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static int nfs_state;
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#define STATE_PRCLOOKUP_PROG_MOUNT_REQ 1
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#define STATE_PRCLOOKUP_PROG_NFS_REQ 2
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#define STATE_MOUNT_REQ 3
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#define STATE_UMOUNT_REQ 4
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#define STATE_LOOKUP_REQ 5
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#define STATE_READ_REQ 6
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#define STATE_READLINK_REQ 7
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#define STATE_DONE 8
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static char *nfs_filename;
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static char *nfs_path;
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static char nfs_path_buff[2048];
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static int net_store_fd;
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static struct net_connection *nfs_con;
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/**************************************************************************
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RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
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**************************************************************************/
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static uint32_t *rpc_add_credentials(uint32_t *p)
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{
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int hl;
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int hostnamelen = 0;
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/* Here's the executive summary on authentication requirements of the
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* various NFS server implementations: Linux accepts both AUTH_NONE
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* and AUTH_UNIX authentication (also accepts an empty hostname field
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* in the AUTH_UNIX scheme). *BSD refuses AUTH_NONE, but accepts
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* AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
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* scheme). To be safe, use AUTH_UNIX and pass the hostname if we have
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* it (if the BOOTP/DHCP reply didn't give one, just use an empty
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* hostname). */
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hl = (hostnamelen + 3) & ~3;
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/* Provide an AUTH_UNIX credential. */
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*p++ = htonl(1); /* AUTH_UNIX */
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*p++ = htonl(hl+20); /* auth length */
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*p++ = htonl(0); /* stamp */
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*p++ = htonl(hostnamelen); /* hostname string */
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if (hostnamelen & 3)
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*(p + hostnamelen / 4) = 0; /* add zero padding */
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/* memcpy(p, hostname, hostnamelen); */ /* empty hostname */
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p += hl / 4;
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*p++ = 0; /* uid */
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*p++ = 0; /* gid */
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*p++ = 0; /* auxiliary gid list */
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/* Provide an AUTH_NONE verifier. */
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*p++ = 0; /* AUTH_NONE */
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*p++ = 0; /* auth length */
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return p;
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}
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/**************************************************************************
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RPC_LOOKUP - Lookup RPC Port numbers
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**************************************************************************/
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static int rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
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{
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struct rpc_call pkt;
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unsigned long id;
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int sport;
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int ret;
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unsigned char *payload = net_udp_get_payload(nfs_con);
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id = ++rpc_id;
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pkt.id = htonl(id);
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pkt.type = htonl(MSG_CALL);
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pkt.rpcvers = htonl(2); /* use RPC version 2 */
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pkt.prog = htonl(rpc_prog);
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pkt.vers = htonl(2); /* portmapper is version 2 */
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pkt.proc = htonl(rpc_proc);
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memcpy(payload, &pkt, sizeof(pkt));
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memcpy(payload + sizeof(pkt), data, datalen * sizeof(uint32_t));
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if (rpc_prog == PROG_PORTMAP)
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sport = SUNRPC_PORT;
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else if (rpc_prog == PROG_MOUNT)
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sport = nfs_server_mount_port;
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else
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sport = nfs_server_nfs_port;
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nfs_con->udp->uh_dport = htons(sport);
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ret = net_udp_send(nfs_con, sizeof(pkt) + datalen * sizeof(uint32_t));
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return ret;
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}
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/**************************************************************************
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RPC_LOOKUP - Lookup RPC Port numbers
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**************************************************************************/
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static void rpc_lookup_req(int prog, int ver)
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{
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uint32_t data[16];
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data[0] = 0; data[1] = 0; /* auth credential */
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data[2] = 0; data[3] = 0; /* auth verifier */
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data[4] = htonl(prog);
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data[5] = htonl(ver);
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data[6] = htonl(17); /* IP_UDP */
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data[7] = 0;
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rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
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}
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/**************************************************************************
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NFS_MOUNT - Mount an NFS Filesystem
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**************************************************************************/
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static void nfs_mount_req(char *path)
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{
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uint32_t data[1024];
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uint32_t *p;
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int len;
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int pathlen;
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pathlen = strlen (path);
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p = &(data[0]);
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p = rpc_add_credentials(p);
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*p++ = htonl(pathlen);
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if (pathlen & 3)
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*(p + pathlen / 4) = 0;
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memcpy (p, path, pathlen);
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p += (pathlen + 3) / 4;
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len = p - &(data[0]);
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rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
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}
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/**************************************************************************
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NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
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**************************************************************************/
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static void nfs_umountall_req(void)
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{
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uint32_t data[1024];
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uint32_t *p;
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int len;
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if (nfs_server_mount_port < 0)
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/* Nothing mounted, nothing to umount */
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return;
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p = &(data[0]);
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p = rpc_add_credentials(p);
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len = p - &(data[0]);
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rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
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}
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/***************************************************************************
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* NFS_READLINK (AH 2003-07-14)
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* This procedure is called when read of the first block fails -
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* this probably happens when it's a directory or a symlink
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* In case of successful readlink(), the dirname is manipulated,
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* so that inside the nfs() function a recursion can be done.
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**************************************************************************/
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static void nfs_readlink_req(void)
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{
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uint32_t data[1024];
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uint32_t *p;
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int len;
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p = &(data[0]);
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p = rpc_add_credentials(p);
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memcpy (p, filefh, NFS_FHSIZE);
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p += (NFS_FHSIZE / 4);
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len = p - &(data[0]);
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rpc_req(PROG_NFS, NFS_READLINK, data, len);
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}
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/**************************************************************************
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NFS_LOOKUP - Lookup Pathname
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**************************************************************************/
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static void nfs_lookup_req(char *fname)
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{
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uint32_t data[1024];
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uint32_t *p;
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int len;
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int fnamelen;
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fnamelen = strlen (fname);
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p = &(data[0]);
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p = rpc_add_credentials(p);
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memcpy (p, dirfh, NFS_FHSIZE);
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p += (NFS_FHSIZE / 4);
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*p++ = htonl(fnamelen);
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if (fnamelen & 3)
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*(p + fnamelen / 4) = 0;
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memcpy (p, fname, fnamelen);
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p += (fnamelen + 3) / 4;
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len = p - &(data[0]);
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rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
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}
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/**************************************************************************
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NFS_READ - Read File on NFS Server
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**************************************************************************/
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static void nfs_read_req(int offset, int readlen)
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{
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uint32_t data[1024];
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uint32_t *p;
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int len;
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p = &(data[0]);
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p = rpc_add_credentials(p);
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memcpy (p, filefh, NFS_FHSIZE);
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p += (NFS_FHSIZE / 4);
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*p++ = htonl(offset);
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*p++ = htonl(readlen);
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*p++ = 0;
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len = p - &(data[0]);
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rpc_req(PROG_NFS, NFS_READ, data, len);
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}
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/**************************************************************************
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RPC request dispatcher
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**************************************************************************/
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static void nfs_send(void)
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{
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debug("%s\n", __func__);
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switch (nfs_state) {
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case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
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rpc_lookup_req(PROG_MOUNT, 1);
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break;
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case STATE_PRCLOOKUP_PROG_NFS_REQ:
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rpc_lookup_req(PROG_NFS, 2);
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break;
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case STATE_MOUNT_REQ:
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nfs_mount_req(nfs_path);
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break;
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case STATE_UMOUNT_REQ:
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nfs_umountall_req();
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break;
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case STATE_LOOKUP_REQ:
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nfs_lookup_req(nfs_filename);
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break;
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case STATE_READ_REQ:
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nfs_read_req(nfs_offset, NFS_READ_SIZE);
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break;
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case STATE_READLINK_REQ:
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nfs_readlink_req();
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break;
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}
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nfs_timer_start = get_time_ns();
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}
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static int rpc_check_reply(unsigned char *pkt, int isnfs)
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{
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uint32_t *data;
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int nfserr;
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struct rpc_reply rpc;
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memcpy(&rpc, pkt, sizeof(rpc));
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if (ntohl(rpc.id) != rpc_id)
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return -EINVAL;
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if (rpc.rstatus ||
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rpc.verifier ||
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rpc.astatus ) {
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return -EINVAL;
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}
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if (!isnfs)
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return 0;
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data = (uint32_t *)(pkt + sizeof(struct rpc_reply));
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nfserr = ntohl(net_read_uint32(data));
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debug("%s: state: %d, err %d\n", __func__, nfs_state, -nfserr);
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if (nfserr <= 30)
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/* These nfs codes correspond with those in errno.h */
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return -nfserr;
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if (nfserr == NFSERR_STALE)
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return -ESTALE;
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return -EINVAL;
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}
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static int rpc_lookup_reply(int prog, unsigned char *pkt, unsigned len)
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{
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uint32_t port;
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int ret;
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ret = rpc_check_reply(pkt, 0);
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if (ret)
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return ret;
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port = net_read_uint32((uint32_t *)(pkt + sizeof(struct rpc_reply)));
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switch (prog) {
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case PROG_MOUNT:
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nfs_server_mount_port = ntohl(port);
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break;
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case PROG_NFS:
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nfs_server_nfs_port = ntohl(port);
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break;
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}
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return 0;
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}
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static int nfs_mount_reply(unsigned char *pkt, unsigned len)
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{
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int ret;
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ret = rpc_check_reply(pkt, 1);
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if (ret)
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return ret;
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memcpy(dirfh, pkt + sizeof(struct rpc_reply) + 4, NFS_FHSIZE);
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return 0;
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}
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static int nfs_umountall_reply(unsigned char *pkt, unsigned len)
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{
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int ret;
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ret = rpc_check_reply(pkt, 0);
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if (ret)
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return ret;
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memset(dirfh, 0, sizeof(dirfh));
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return 0;
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}
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static int nfs_lookup_reply(unsigned char *pkt, unsigned len)
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{
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int ret;
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ret = rpc_check_reply(pkt, 1);
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if (ret)
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return ret;
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memcpy(filefh, pkt + sizeof(struct rpc_reply) + 4, NFS_FHSIZE);
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return 0;
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}
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static int nfs_readlink_reply(unsigned char *pkt, unsigned len)
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{
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uint32_t *data;
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char *path;
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int rlen;
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int ret;
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ret = rpc_check_reply(pkt, 1);
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if (ret)
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return ret;
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data = (uint32_t *)(pkt + sizeof(struct rpc_reply));
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data++;
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rlen = ntohl(net_read_uint32(data)); /* new path length */
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data++;
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path = (char *)data;
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if (*path != '/') {
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strcat(nfs_path, "/");
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strncat(nfs_path, path, rlen);
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} else {
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memcpy(nfs_path, path, rlen);
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nfs_path[rlen] = 0;
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}
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return 0;
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}
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static int nfs_read_reply(unsigned char *pkt, unsigned len)
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{
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int rlen;
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uint32_t *data;
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int ret;
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debug("%s\n", __func__);
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ret = rpc_check_reply(pkt, 1);
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if (ret)
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return ret;
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data = (uint32_t *)(pkt + sizeof(struct rpc_reply));
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if (!nfs_offset) {
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uint32_t filesize = ntohl(net_read_uint32(data + 6));
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|
init_progression_bar(filesize);
|
|
}
|
|
|
|
rlen = ntohl(net_read_uint32(data + 18));
|
|
|
|
ret = write(net_store_fd, (char *)(data + 19), rlen);
|
|
if (ret < 0) {
|
|
perror("write");
|
|
return ret;
|
|
}
|
|
|
|
return rlen;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Interfaces of barebox
|
|
**************************************************************************/
|
|
|
|
static void nfs_handler(void *ctx, char *packet, unsigned len)
|
|
{
|
|
char *pkt = net_eth_to_udp_payload(packet);
|
|
int ret;
|
|
|
|
debug("%s\n", __func__);
|
|
|
|
switch (nfs_state) {
|
|
case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
|
|
ret = rpc_lookup_reply(PROG_MOUNT, pkt, len);
|
|
if (ret)
|
|
goto err_out;
|
|
nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
|
|
break;
|
|
|
|
case STATE_PRCLOOKUP_PROG_NFS_REQ:
|
|
ret = rpc_lookup_reply(PROG_NFS, pkt, len);
|
|
if (ret)
|
|
goto err_out;
|
|
nfs_state = STATE_MOUNT_REQ;
|
|
break;
|
|
|
|
case STATE_MOUNT_REQ:
|
|
ret = nfs_mount_reply(pkt, len);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
nfs_state = STATE_LOOKUP_REQ;
|
|
break;
|
|
|
|
case STATE_UMOUNT_REQ:
|
|
ret = nfs_umountall_reply(pkt, len);
|
|
if (ret)
|
|
nfs_err = ret;
|
|
nfs_state = STATE_DONE;
|
|
return;
|
|
|
|
case STATE_LOOKUP_REQ:
|
|
ret = nfs_lookup_reply(pkt, len);
|
|
if (ret)
|
|
goto err_umount;
|
|
|
|
nfs_state = STATE_READ_REQ;
|
|
nfs_offset = 0;
|
|
break;
|
|
|
|
case STATE_READLINK_REQ:
|
|
ret = nfs_readlink_reply(pkt, len);
|
|
if (ret)
|
|
goto err_umount;
|
|
|
|
debug("Symlink --> %s\n", nfs_path);
|
|
|
|
nfs_filename = basename(nfs_path);
|
|
nfs_path = dirname(nfs_path);
|
|
|
|
nfs_state = STATE_MOUNT_REQ;
|
|
break;
|
|
|
|
case STATE_READ_REQ:
|
|
ret = nfs_read_reply(pkt, len);
|
|
nfs_timer_start = get_time_ns();
|
|
if (ret > 0)
|
|
nfs_offset += ret;
|
|
else if (ret == -EISDIR || ret == -EINVAL)
|
|
/* symbolic link */
|
|
nfs_state = STATE_READLINK_REQ;
|
|
else
|
|
goto err_umount;
|
|
show_progress(nfs_offset);
|
|
break;
|
|
}
|
|
|
|
nfs_send();
|
|
|
|
return;
|
|
|
|
err_umount:
|
|
nfs_state = STATE_UMOUNT_REQ;
|
|
nfs_err = ret;
|
|
nfs_send();
|
|
return;
|
|
|
|
err_out:
|
|
nfs_state = STATE_DONE;
|
|
nfs_err = ret;
|
|
}
|
|
|
|
static void nfs_start(char *p)
|
|
{
|
|
debug("%s\n", __func__);
|
|
|
|
nfs_path = (char *)nfs_path_buff;
|
|
|
|
strcpy(nfs_path, p);
|
|
|
|
nfs_filename = basename (nfs_path);
|
|
nfs_path = dirname (nfs_path);
|
|
|
|
printf("\nFilename '%s/%s'.\n", nfs_path, nfs_filename);
|
|
|
|
nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
|
|
|
|
nfs_send();
|
|
}
|
|
|
|
static int do_nfs(int argc, char *argv[])
|
|
{
|
|
char *localfile;
|
|
char *remotefile;
|
|
|
|
if (argc < 2)
|
|
return COMMAND_ERROR_USAGE;
|
|
|
|
remotefile = argv[1];
|
|
|
|
if (argc == 2)
|
|
localfile = basename(remotefile);
|
|
else
|
|
localfile = argv[2];
|
|
|
|
net_store_fd = open(localfile, O_WRONLY | O_CREAT);
|
|
if (net_store_fd < 0) {
|
|
perror("open");
|
|
return 1;
|
|
}
|
|
|
|
nfs_con = net_udp_new(net_get_serverip(), 0, nfs_handler, NULL);
|
|
if (IS_ERR(nfs_con)) {
|
|
nfs_err = PTR_ERR(nfs_con);
|
|
goto err_udp;
|
|
}
|
|
net_udp_bind(nfs_con, 1000);
|
|
|
|
nfs_err = 0;
|
|
|
|
nfs_start(remotefile);
|
|
|
|
while (nfs_state != STATE_DONE) {
|
|
if (ctrlc()) {
|
|
nfs_err = -EINTR;
|
|
break;
|
|
}
|
|
net_poll();
|
|
if (is_timeout(nfs_timer_start, NFS_TIMEOUT * SECOND)) {
|
|
show_progress(-1);
|
|
nfs_send();
|
|
}
|
|
}
|
|
|
|
net_unregister(nfs_con);
|
|
err_udp:
|
|
close(net_store_fd);
|
|
if (nfs_err) {
|
|
printf("NFS failed: %s\n", strerror(-nfs_err));
|
|
unlink(localfile);
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
return nfs_err == 0 ? 0 : 1;
|
|
}
|
|
|
|
BAREBOX_CMD_START(nfs)
|
|
.cmd = do_nfs,
|
|
BAREBOX_CMD_DESC("boot image over NFS")
|
|
BAREBOX_CMD_OPTS("FILE [LOCALFILE]")
|
|
BAREBOX_CMD_GROUP(CMD_GRP_NET)
|
|
BAREBOX_CMD_END
|