1 /* 2 * In-kernel MOUNT protocol client 3 * 4 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> 5 */ 6 7 #include <linux/types.h> 8 #include <linux/socket.h> 9 #include <linux/kernel.h> 10 #include <linux/errno.h> 11 #include <linux/uio.h> 12 #include <linux/net.h> 13 #include <linux/in.h> 14 #include <linux/sunrpc/clnt.h> 15 #include <linux/sunrpc/sched.h> 16 #include <linux/nfs_fs.h> 17 18 #ifdef RPC_DEBUG 19 # define NFSDBG_FACILITY NFSDBG_MOUNT 20 #endif 21 22 static struct rpc_program mnt_program; 23 24 struct mnt_fhstatus { 25 u32 status; 26 struct nfs_fh *fh; 27 }; 28 29 /** 30 * nfs_mount - Obtain an NFS file handle for the given host and path 31 * @addr: pointer to server's address 32 * @len: size of server's address 33 * @hostname: name of server host, or NULL 34 * @path: pointer to string containing export path to mount 35 * @version: mount version to use for this request 36 * @protocol: transport protocol to use for thie request 37 * @fh: pointer to location to place returned file handle 38 * 39 * Uses default timeout parameters specified by underlying transport. 40 */ 41 int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path, 42 int version, int protocol, struct nfs_fh *fh) 43 { 44 struct mnt_fhstatus result = { 45 .fh = fh 46 }; 47 struct rpc_message msg = { 48 .rpc_argp = path, 49 .rpc_resp = &result, 50 }; 51 struct rpc_create_args args = { 52 .protocol = protocol, 53 .address = addr, 54 .addrsize = len, 55 .servername = hostname, 56 .program = &mnt_program, 57 .version = version, 58 .authflavor = RPC_AUTH_UNIX, 59 .flags = 0, 60 }; 61 struct rpc_clnt *mnt_clnt; 62 int status; 63 64 dprintk("NFS: sending MNT request for %s:%s\n", 65 (hostname ? hostname : "server"), path); 66 67 mnt_clnt = rpc_create(&args); 68 if (IS_ERR(mnt_clnt)) 69 goto out_clnt_err; 70 71 if (version == NFS_MNT3_VERSION) 72 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; 73 else 74 msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT]; 75 76 status = rpc_call_sync(mnt_clnt, &msg, 0); 77 rpc_shutdown_client(mnt_clnt); 78 79 if (status < 0) 80 goto out_call_err; 81 if (result.status != 0) 82 goto out_mnt_err; 83 84 dprintk("NFS: MNT request succeeded\n"); 85 status = 0; 86 87 out: 88 return status; 89 90 out_clnt_err: 91 status = PTR_ERR(mnt_clnt); 92 dprintk("NFS: failed to create RPC client, status=%d\n", status); 93 goto out; 94 95 out_call_err: 96 dprintk("NFS: failed to start MNT request, status=%d\n", status); 97 goto out; 98 99 out_mnt_err: 100 dprintk("NFS: MNT server returned result %d\n", result.status); 101 status = -EACCES; 102 goto out; 103 } 104 105 /* 106 * XDR encode/decode functions for MOUNT 107 */ 108 static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p, 109 const char *path) 110 { 111 p = xdr_encode_string(p, path); 112 113 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 114 return 0; 115 } 116 117 static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p, 118 struct mnt_fhstatus *res) 119 { 120 struct nfs_fh *fh = res->fh; 121 122 if ((res->status = ntohl(*p++)) == 0) { 123 fh->size = NFS2_FHSIZE; 124 memcpy(fh->data, p, NFS2_FHSIZE); 125 } 126 return 0; 127 } 128 129 static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, 130 struct mnt_fhstatus *res) 131 { 132 struct nfs_fh *fh = res->fh; 133 unsigned size; 134 135 if ((res->status = ntohl(*p++)) == 0) { 136 size = ntohl(*p++); 137 if (size <= NFS3_FHSIZE && size != 0) { 138 fh->size = size; 139 memcpy(fh->data, p, size); 140 } else 141 res->status = -EBADHANDLE; 142 } 143 return 0; 144 } 145 146 #define MNT_dirpath_sz (1 + 256) 147 #define MNT_fhstatus_sz (1 + 8) 148 #define MNT_fhstatus3_sz (1 + 16) 149 150 static struct rpc_procinfo mnt_procedures[] = { 151 [MNTPROC_MNT] = { 152 .p_proc = MNTPROC_MNT, 153 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 154 .p_decode = (kxdrproc_t) xdr_decode_fhstatus, 155 .p_arglen = MNT_dirpath_sz, 156 .p_replen = MNT_fhstatus_sz, 157 .p_statidx = MNTPROC_MNT, 158 .p_name = "MOUNT", 159 }, 160 }; 161 162 static struct rpc_procinfo mnt3_procedures[] = { 163 [MOUNTPROC3_MNT] = { 164 .p_proc = MOUNTPROC3_MNT, 165 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 166 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, 167 .p_arglen = MNT_dirpath_sz, 168 .p_replen = MNT_fhstatus3_sz, 169 .p_statidx = MOUNTPROC3_MNT, 170 .p_name = "MOUNT", 171 }, 172 }; 173 174 175 static struct rpc_version mnt_version1 = { 176 .number = 1, 177 .nrprocs = 2, 178 .procs = mnt_procedures, 179 }; 180 181 static struct rpc_version mnt_version3 = { 182 .number = 3, 183 .nrprocs = 2, 184 .procs = mnt3_procedures, 185 }; 186 187 static struct rpc_version *mnt_version[] = { 188 NULL, 189 &mnt_version1, 190 NULL, 191 &mnt_version3, 192 }; 193 194 static struct rpc_stat mnt_stats; 195 196 static struct rpc_program mnt_program = { 197 .name = "mount", 198 .number = NFS_MNT_PROGRAM, 199 .nrvers = ARRAY_SIZE(mnt_version), 200 .version = mnt_version, 201 .stats = &mnt_stats, 202 }; 203