Root/fs/nfsd/nfs3acl.c

1/*
2 * Process version 3 NFSACL requests.
3 *
4 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
5 */
6
7#include "nfsd.h"
8/* FIXME: nfsacl.h is a broken header */
9#include <linux/nfsacl.h>
10#include <linux/gfp.h>
11#include "cache.h"
12#include "xdr3.h"
13#include "vfs.h"
14
15#define RETURN_STATUS(st) { resp->status = (st); return (st); }
16
17/*
18 * NULL call.
19 */
20static __be32
21nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
22{
23    return nfs_ok;
24}
25
26/*
27 * Get the Access and/or Default ACL of a file.
28 */
29static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
30        struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
31{
32    svc_fh *fh;
33    struct posix_acl *acl;
34    __be32 nfserr = 0;
35
36    fh = fh_copy(&resp->fh, &argp->fh);
37    nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
38    if (nfserr)
39        RETURN_STATUS(nfserr);
40
41    if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
42        RETURN_STATUS(nfserr_inval);
43    resp->mask = argp->mask;
44
45    if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
46        acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
47        if (IS_ERR(acl)) {
48            int err = PTR_ERR(acl);
49
50            if (err == -ENODATA || err == -EOPNOTSUPP)
51                acl = NULL;
52            else {
53                nfserr = nfserrno(err);
54                goto fail;
55            }
56        }
57        if (acl == NULL) {
58            /* Solaris returns the inode's minimum ACL. */
59
60            struct inode *inode = fh->fh_dentry->d_inode;
61            acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
62        }
63        resp->acl_access = acl;
64    }
65    if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
66        /* Check how Solaris handles requests for the Default ACL
67           of a non-directory! */
68
69        acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
70        if (IS_ERR(acl)) {
71            int err = PTR_ERR(acl);
72
73            if (err == -ENODATA || err == -EOPNOTSUPP)
74                acl = NULL;
75            else {
76                nfserr = nfserrno(err);
77                goto fail;
78            }
79        }
80        resp->acl_default = acl;
81    }
82
83    /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
84    RETURN_STATUS(0);
85
86fail:
87    posix_acl_release(resp->acl_access);
88    posix_acl_release(resp->acl_default);
89    RETURN_STATUS(nfserr);
90}
91
92/*
93 * Set the Access and/or Default ACL of a file.
94 */
95static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
96        struct nfsd3_setaclargs *argp,
97        struct nfsd3_attrstat *resp)
98{
99    svc_fh *fh;
100    __be32 nfserr = 0;
101
102    fh = fh_copy(&resp->fh, &argp->fh);
103    nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
104
105    if (!nfserr) {
106        nfserr = nfserrno( nfsd_set_posix_acl(
107            fh, ACL_TYPE_ACCESS, argp->acl_access) );
108    }
109    if (!nfserr) {
110        nfserr = nfserrno( nfsd_set_posix_acl(
111            fh, ACL_TYPE_DEFAULT, argp->acl_default) );
112    }
113
114    /* argp->acl_{access,default} may have been allocated in
115       nfs3svc_decode_setaclargs. */
116    posix_acl_release(argp->acl_access);
117    posix_acl_release(argp->acl_default);
118    RETURN_STATUS(nfserr);
119}
120
121/*
122 * XDR decode functions
123 */
124static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
125        struct nfsd3_getaclargs *args)
126{
127    if (!(p = nfs3svc_decode_fh(p, &args->fh)))
128        return 0;
129    args->mask = ntohl(*p); p++;
130
131    return xdr_argsize_check(rqstp, p);
132}
133
134
135static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
136        struct nfsd3_setaclargs *args)
137{
138    struct kvec *head = rqstp->rq_arg.head;
139    unsigned int base;
140    int n;
141
142    if (!(p = nfs3svc_decode_fh(p, &args->fh)))
143        return 0;
144    args->mask = ntohl(*p++);
145    if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
146        !xdr_argsize_check(rqstp, p))
147        return 0;
148
149    base = (char *)p - (char *)head->iov_base;
150    n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
151              (args->mask & NFS_ACL) ?
152              &args->acl_access : NULL);
153    if (n > 0)
154        n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
155                  (args->mask & NFS_DFACL) ?
156                  &args->acl_default : NULL);
157    return (n > 0);
158}
159
160/*
161 * XDR encode functions
162 */
163
164/* GETACL */
165static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
166        struct nfsd3_getaclres *resp)
167{
168    struct dentry *dentry = resp->fh.fh_dentry;
169
170    p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
171    if (resp->status == 0 && dentry && dentry->d_inode) {
172        struct inode *inode = dentry->d_inode;
173        struct kvec *head = rqstp->rq_res.head;
174        unsigned int base;
175        int n;
176        int w;
177
178        *p++ = htonl(resp->mask);
179        if (!xdr_ressize_check(rqstp, p))
180            return 0;
181        base = (char *)p - (char *)head->iov_base;
182
183        rqstp->rq_res.page_len = w = nfsacl_size(
184            (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
185            (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
186        while (w > 0) {
187            if (!rqstp->rq_respages[rqstp->rq_resused++])
188                return 0;
189            w -= PAGE_SIZE;
190        }
191
192        n = nfsacl_encode(&rqstp->rq_res, base, inode,
193                  resp->acl_access,
194                  resp->mask & NFS_ACL, 0);
195        if (n > 0)
196            n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
197                      resp->acl_default,
198                      resp->mask & NFS_DFACL,
199                      NFS_ACL_DEFAULT);
200        if (n <= 0)
201            return 0;
202    } else
203        if (!xdr_ressize_check(rqstp, p))
204            return 0;
205
206    return 1;
207}
208
209/* SETACL */
210static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
211        struct nfsd3_attrstat *resp)
212{
213    p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
214
215    return xdr_ressize_check(rqstp, p);
216}
217
218/*
219 * XDR release functions
220 */
221static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
222        struct nfsd3_getaclres *resp)
223{
224    fh_put(&resp->fh);
225    posix_acl_release(resp->acl_access);
226    posix_acl_release(resp->acl_default);
227    return 1;
228}
229
230#define nfs3svc_decode_voidargs NULL
231#define nfs3svc_release_void NULL
232#define nfsd3_setaclres nfsd3_attrstat
233#define nfsd3_voidres nfsd3_voidargs
234struct nfsd3_voidargs { int dummy; };
235
236#define PROC(name, argt, rest, relt, cache, respsize) \
237 { (svc_procfunc) nfsd3_proc_##name, \
238   (kxdrproc_t) nfs3svc_decode_##argt##args, \
239   (kxdrproc_t) nfs3svc_encode_##rest##res, \
240   (kxdrproc_t) nfs3svc_release_##relt, \
241   sizeof(struct nfsd3_##argt##args), \
242   sizeof(struct nfsd3_##rest##res), \
243   0, \
244   cache, \
245   respsize, \
246 }
247
248#define ST 1 /* status*/
249#define AT 21 /* attributes */
250#define pAT (1+AT) /* post attributes - conditional */
251#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
252
253static struct svc_procedure nfsd_acl_procedures3[] = {
254  PROC(null, void, void, void, RC_NOCACHE, ST),
255  PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
256  PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
257};
258
259struct svc_version nfsd_acl_version3 = {
260        .vs_vers = 3,
261        .vs_nproc = 3,
262        .vs_proc = nfsd_acl_procedures3,
263        .vs_dispatch = nfsd_dispatch,
264        .vs_xdrsize = NFS3_SVC_XDRSIZE,
265        .vs_hidden = 0,
266};
267
268

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