1 /*
2 * linux/fs/nfs/mount_clnt.c
3 *
4 * MOUNT client to support NFSroot.
5 *
6 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
7 */
8
9 #include <linux/types.h>
10 #include <linux/socket.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/uio.h>
14 #include <linux/net.h>
15 #include <linux/in.h>
16 #include <linux/sunrpc/clnt.h>
17 #include <linux/sunrpc/xprt.h>
18 #include <linux/sunrpc/sched.h>
19 #include <linux/nfs_fs.h>
20
21 #ifdef RPC_DEBUG
22 # define NFSDBG_FACILITY NFSDBG_ROOT
23 #endif
24
25 /*
26 #define MOUNT_PROGRAM 100005
27 #define MOUNT_VERSION 1
28 #define MOUNT_MNT 1
29 #define MOUNT_UMNT 3
30 */
31
32 static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *,
33 int, int);
34 struct rpc_program mnt_program;
35
36 struct mnt_fhstatus {
37 unsigned int status;
38 struct nfs_fh * fh;
39 };
40
41 /*
42 * Obtain an NFS file handle for the given host and path
43 */
44 int
nfsroot_mount(struct sockaddr_in * addr,char * path,struct nfs_fh * fh,int version,int protocol)45 nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
46 int version, int protocol)
47 {
48 struct rpc_clnt *mnt_clnt;
49 struct mnt_fhstatus result = { 0, fh };
50 char hostname[32];
51 int status;
52 int call;
53
54 dprintk("NFS: nfs_mount(%08x:%s)\n",
55 (unsigned)ntohl(addr->sin_addr.s_addr), path);
56
57 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
58 if (!(mnt_clnt = mnt_create(hostname, addr, version, protocol)))
59 return -EACCES;
60
61 call = (version == NFS_MNT3_VERSION)? MOUNTPROC3_MNT : MNTPROC_MNT;
62 status = rpc_call(mnt_clnt, call, path, &result, 0);
63 return status < 0? status : (result.status? -EACCES : 0);
64 }
65
66 static struct rpc_clnt *
mnt_create(char * hostname,struct sockaddr_in * srvaddr,int version,int protocol)67 mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version,
68 int protocol)
69 {
70 struct rpc_xprt *xprt;
71 struct rpc_clnt *clnt;
72
73 if (!(xprt = xprt_create_proto(protocol, srvaddr, NULL)))
74 return NULL;
75
76 clnt = rpc_create_client(xprt, hostname,
77 &mnt_program, version,
78 RPC_AUTH_NULL);
79 if (!clnt) {
80 xprt_destroy(xprt);
81 } else {
82 clnt->cl_softrtry = 1;
83 clnt->cl_chatty = 1;
84 clnt->cl_oneshot = 1;
85 clnt->cl_intr = 1;
86 }
87 return clnt;
88 }
89
90 /*
91 * XDR encode/decode functions for MOUNT
92 */
93 static int
xdr_error(struct rpc_rqst * req,u32 * p,void * dummy)94 xdr_error(struct rpc_rqst *req, u32 *p, void *dummy)
95 {
96 return -EIO;
97 }
98
99 static int
xdr_encode_dirpath(struct rpc_rqst * req,u32 * p,const char * path)100 xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path)
101 {
102 p = xdr_encode_string(p, path);
103
104 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
105 return 0;
106 }
107
108 static int
xdr_decode_fhstatus(struct rpc_rqst * req,u32 * p,struct mnt_fhstatus * res)109 xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
110 {
111 struct nfs_fh *fh = res->fh;
112
113 memset((void *)fh, 0, sizeof(*fh));
114 if ((res->status = ntohl(*p++)) == 0) {
115 fh->size = NFS2_FHSIZE;
116 memcpy(fh->data, p, NFS2_FHSIZE);
117 }
118 return 0;
119 }
120
121 static int
xdr_decode_fhstatus3(struct rpc_rqst * req,u32 * p,struct mnt_fhstatus * res)122 xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
123 {
124 struct nfs_fh *fh = res->fh;
125
126 memset((void *)fh, 0, sizeof(*fh));
127 if ((res->status = ntohl(*p++)) == 0) {
128 int size = ntohl(*p++);
129 if (size <= NFS3_FHSIZE) {
130 fh->size = size;
131 memcpy(fh->data, p, size);
132 } else
133 res->status = -EBADHANDLE;
134 }
135 return 0;
136 }
137
138 #define MNT_dirpath_sz (1 + 256)
139 #define MNT_fhstatus_sz (1 + 8)
140
141 static struct rpc_procinfo mnt_procedures[2] = {
142 { "mnt_null",
143 (kxdrproc_t) xdr_error,
144 (kxdrproc_t) xdr_error, 0, 0 },
145 { "mnt_mount",
146 (kxdrproc_t) xdr_encode_dirpath,
147 (kxdrproc_t) xdr_decode_fhstatus,
148 MNT_dirpath_sz << 2, 0 },
149 };
150
151 static struct rpc_procinfo mnt3_procedures[2] = {
152 { "mnt3_null",
153 (kxdrproc_t) xdr_error,
154 (kxdrproc_t) xdr_error, 0, 0 },
155 { "mnt3_mount",
156 (kxdrproc_t) xdr_encode_dirpath,
157 (kxdrproc_t) xdr_decode_fhstatus3,
158 MNT_dirpath_sz << 2, 0 },
159 };
160
161
162 static struct rpc_version mnt_version1 = {
163 1, 2, mnt_procedures
164 };
165
166 static struct rpc_version mnt_version3 = {
167 3, 2, mnt3_procedures
168 };
169
170 static struct rpc_version * mnt_version[] = {
171 NULL,
172 &mnt_version1,
173 NULL,
174 &mnt_version3,
175 };
176
177 static struct rpc_stat mnt_stats;
178
179 struct rpc_program mnt_program = {
180 "mount",
181 NFS_MNT_PROGRAM,
182 sizeof(mnt_version)/sizeof(mnt_version[0]),
183 mnt_version,
184 &mnt_stats,
185 };
186