mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b7e2445737
Fix a sign issue in xdr_decode_fhstatus3() Fix incorrect comparison in nfs_validate_mount_data() Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
203 lines
4.4 KiB
C
203 lines
4.4 KiB
C
/*
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* In-kernel MOUNT protocol client
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*
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* Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/uio.h>
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#include <linux/net.h>
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#include <linux/in.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/nfs_fs.h>
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#ifdef RPC_DEBUG
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# define NFSDBG_FACILITY NFSDBG_MOUNT
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#endif
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static struct rpc_program mnt_program;
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struct mnt_fhstatus {
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u32 status;
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struct nfs_fh *fh;
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};
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/**
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* nfs_mount - Obtain an NFS file handle for the given host and path
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* @addr: pointer to server's address
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* @len: size of server's address
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* @hostname: name of server host, or NULL
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* @path: pointer to string containing export path to mount
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* @version: mount version to use for this request
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* @protocol: transport protocol to use for thie request
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* @fh: pointer to location to place returned file handle
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*
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* Uses default timeout parameters specified by underlying transport.
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*/
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int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path,
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int version, int protocol, struct nfs_fh *fh)
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{
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struct mnt_fhstatus result = {
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.fh = fh
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};
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struct rpc_message msg = {
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.rpc_argp = path,
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.rpc_resp = &result,
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};
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struct rpc_create_args args = {
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.protocol = protocol,
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.address = addr,
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.addrsize = len,
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.servername = hostname,
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.program = &mnt_program,
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.version = version,
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.authflavor = RPC_AUTH_UNIX,
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.flags = 0,
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};
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struct rpc_clnt *mnt_clnt;
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int status;
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dprintk("NFS: sending MNT request for %s:%s\n",
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(hostname ? hostname : "server"), path);
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mnt_clnt = rpc_create(&args);
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if (IS_ERR(mnt_clnt))
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goto out_clnt_err;
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if (version == NFS_MNT3_VERSION)
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msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
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else
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msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT];
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status = rpc_call_sync(mnt_clnt, &msg, 0);
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rpc_shutdown_client(mnt_clnt);
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if (status < 0)
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goto out_call_err;
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if (result.status != 0)
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goto out_mnt_err;
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dprintk("NFS: MNT request succeeded\n");
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status = 0;
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out:
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return status;
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out_clnt_err:
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status = PTR_ERR(mnt_clnt);
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dprintk("NFS: failed to create RPC client, status=%d\n", status);
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goto out;
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out_call_err:
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dprintk("NFS: failed to start MNT request, status=%d\n", status);
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goto out;
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out_mnt_err:
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dprintk("NFS: MNT server returned result %d\n", result.status);
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status = -EACCES;
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goto out;
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}
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/*
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* XDR encode/decode functions for MOUNT
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*/
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static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p,
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const char *path)
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{
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p = xdr_encode_string(p, path);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,
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struct mnt_fhstatus *res)
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{
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struct nfs_fh *fh = res->fh;
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if ((res->status = ntohl(*p++)) == 0) {
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fh->size = NFS2_FHSIZE;
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memcpy(fh->data, p, NFS2_FHSIZE);
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}
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return 0;
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}
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static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
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struct mnt_fhstatus *res)
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{
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struct nfs_fh *fh = res->fh;
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unsigned size;
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if ((res->status = ntohl(*p++)) == 0) {
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size = ntohl(*p++);
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if (size <= NFS3_FHSIZE && size != 0) {
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fh->size = size;
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memcpy(fh->data, p, size);
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} else
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res->status = -EBADHANDLE;
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}
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return 0;
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}
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#define MNT_dirpath_sz (1 + 256)
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#define MNT_fhstatus_sz (1 + 8)
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#define MNT_fhstatus3_sz (1 + 16)
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static struct rpc_procinfo mnt_procedures[] = {
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[MNTPROC_MNT] = {
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.p_proc = MNTPROC_MNT,
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.p_encode = (kxdrproc_t) xdr_encode_dirpath,
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.p_decode = (kxdrproc_t) xdr_decode_fhstatus,
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.p_arglen = MNT_dirpath_sz,
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.p_replen = MNT_fhstatus_sz,
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.p_statidx = MNTPROC_MNT,
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.p_name = "MOUNT",
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},
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};
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static struct rpc_procinfo mnt3_procedures[] = {
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[MOUNTPROC3_MNT] = {
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.p_proc = MOUNTPROC3_MNT,
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.p_encode = (kxdrproc_t) xdr_encode_dirpath,
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.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
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.p_arglen = MNT_dirpath_sz,
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.p_replen = MNT_fhstatus3_sz,
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.p_statidx = MOUNTPROC3_MNT,
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.p_name = "MOUNT",
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},
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};
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static struct rpc_version mnt_version1 = {
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.number = 1,
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.nrprocs = 2,
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.procs = mnt_procedures,
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};
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static struct rpc_version mnt_version3 = {
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.number = 3,
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.nrprocs = 2,
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.procs = mnt3_procedures,
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};
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static struct rpc_version *mnt_version[] = {
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NULL,
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&mnt_version1,
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NULL,
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&mnt_version3,
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};
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static struct rpc_stat mnt_stats;
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static struct rpc_program mnt_program = {
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.name = "mount",
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.number = NFS_MNT_PROGRAM,
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.nrvers = ARRAY_SIZE(mnt_version),
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.version = mnt_version,
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.stats = &mnt_stats,
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};
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