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 */ 20 static __be32 21 nfsd3_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 */ 29 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp, 30 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp) 31 { 32 struct posix_acl *acl; 33 struct inode *inode; 34 svc_fh *fh; 35 __be32 nfserr = 0; 36 37 fh = fh_copy(&resp->fh, &argp->fh); 38 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 39 if (nfserr) 40 RETURN_STATUS(nfserr); 41 42 inode = fh->fh_dentry->d_inode; 43 44 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) 45 RETURN_STATUS(nfserr_inval); 46 resp->mask = argp->mask; 47 48 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { 49 acl = get_acl(inode, ACL_TYPE_ACCESS); 50 if (acl == NULL) { 51 /* Solaris returns the inode's minimum ACL. */ 52 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 53 } 54 if (IS_ERR(acl)) { 55 nfserr = nfserrno(PTR_ERR(acl)); 56 goto fail; 57 } 58 resp->acl_access = acl; 59 } 60 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { 61 /* Check how Solaris handles requests for the Default ACL 62 of a non-directory! */ 63 acl = get_acl(inode, ACL_TYPE_DEFAULT); 64 if (IS_ERR(acl)) { 65 nfserr = nfserrno(PTR_ERR(acl)); 66 goto fail; 67 } 68 resp->acl_default = acl; 69 } 70 71 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */ 72 RETURN_STATUS(0); 73 74 fail: 75 posix_acl_release(resp->acl_access); 76 posix_acl_release(resp->acl_default); 77 RETURN_STATUS(nfserr); 78 } 79 80 /* 81 * Set the Access and/or Default ACL of a file. 82 */ 83 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp, 84 struct nfsd3_setaclargs *argp, 85 struct nfsd3_attrstat *resp) 86 { 87 struct inode *inode; 88 svc_fh *fh; 89 __be32 nfserr = 0; 90 int error; 91 92 fh = fh_copy(&resp->fh, &argp->fh); 93 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 94 if (nfserr) 95 goto out; 96 97 inode = fh->fh_dentry->d_inode; 98 if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) { 99 error = -EOPNOTSUPP; 100 goto out_errno; 101 } 102 103 error = fh_want_write(fh); 104 if (error) 105 goto out_errno; 106 107 error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS); 108 if (error) 109 goto out_drop_write; 110 error = inode->i_op->set_acl(inode, argp->acl_default, 111 ACL_TYPE_DEFAULT); 112 113 out_drop_write: 114 fh_drop_write(fh); 115 out_errno: 116 nfserr = nfserrno(error); 117 out: 118 /* argp->acl_{access,default} may have been allocated in 119 nfs3svc_decode_setaclargs. */ 120 posix_acl_release(argp->acl_access); 121 posix_acl_release(argp->acl_default); 122 RETURN_STATUS(nfserr); 123 } 124 125 /* 126 * XDR decode functions 127 */ 128 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p, 129 struct nfsd3_getaclargs *args) 130 { 131 p = nfs3svc_decode_fh(p, &args->fh); 132 if (!p) 133 return 0; 134 args->mask = ntohl(*p); p++; 135 136 return xdr_argsize_check(rqstp, p); 137 } 138 139 140 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p, 141 struct nfsd3_setaclargs *args) 142 { 143 struct kvec *head = rqstp->rq_arg.head; 144 unsigned int base; 145 int n; 146 147 p = nfs3svc_decode_fh(p, &args->fh); 148 if (!p) 149 return 0; 150 args->mask = ntohl(*p++); 151 if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) || 152 !xdr_argsize_check(rqstp, p)) 153 return 0; 154 155 base = (char *)p - (char *)head->iov_base; 156 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 157 (args->mask & NFS_ACL) ? 158 &args->acl_access : NULL); 159 if (n > 0) 160 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 161 (args->mask & NFS_DFACL) ? 162 &args->acl_default : NULL); 163 return (n > 0); 164 } 165 166 /* 167 * XDR encode functions 168 */ 169 170 /* GETACL */ 171 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p, 172 struct nfsd3_getaclres *resp) 173 { 174 struct dentry *dentry = resp->fh.fh_dentry; 175 176 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 177 if (resp->status == 0 && dentry && dentry->d_inode) { 178 struct inode *inode = dentry->d_inode; 179 struct kvec *head = rqstp->rq_res.head; 180 unsigned int base; 181 int n; 182 int w; 183 184 *p++ = htonl(resp->mask); 185 if (!xdr_ressize_check(rqstp, p)) 186 return 0; 187 base = (char *)p - (char *)head->iov_base; 188 189 rqstp->rq_res.page_len = w = nfsacl_size( 190 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 191 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 192 while (w > 0) { 193 if (!*(rqstp->rq_next_page++)) 194 return 0; 195 w -= PAGE_SIZE; 196 } 197 198 n = nfsacl_encode(&rqstp->rq_res, base, inode, 199 resp->acl_access, 200 resp->mask & NFS_ACL, 0); 201 if (n > 0) 202 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 203 resp->acl_default, 204 resp->mask & NFS_DFACL, 205 NFS_ACL_DEFAULT); 206 if (n <= 0) 207 return 0; 208 } else 209 if (!xdr_ressize_check(rqstp, p)) 210 return 0; 211 212 return 1; 213 } 214 215 /* SETACL */ 216 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p, 217 struct nfsd3_attrstat *resp) 218 { 219 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 220 221 return xdr_ressize_check(rqstp, p); 222 } 223 224 /* 225 * XDR release functions 226 */ 227 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p, 228 struct nfsd3_getaclres *resp) 229 { 230 fh_put(&resp->fh); 231 posix_acl_release(resp->acl_access); 232 posix_acl_release(resp->acl_default); 233 return 1; 234 } 235 236 #define nfs3svc_decode_voidargs NULL 237 #define nfs3svc_release_void NULL 238 #define nfsd3_setaclres nfsd3_attrstat 239 #define nfsd3_voidres nfsd3_voidargs 240 struct nfsd3_voidargs { int dummy; }; 241 242 #define PROC(name, argt, rest, relt, cache, respsize) \ 243 { (svc_procfunc) nfsd3_proc_##name, \ 244 (kxdrproc_t) nfs3svc_decode_##argt##args, \ 245 (kxdrproc_t) nfs3svc_encode_##rest##res, \ 246 (kxdrproc_t) nfs3svc_release_##relt, \ 247 sizeof(struct nfsd3_##argt##args), \ 248 sizeof(struct nfsd3_##rest##res), \ 249 0, \ 250 cache, \ 251 respsize, \ 252 } 253 254 #define ST 1 /* status*/ 255 #define AT 21 /* attributes */ 256 #define pAT (1+AT) /* post attributes - conditional */ 257 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 258 259 static struct svc_procedure nfsd_acl_procedures3[] = { 260 PROC(null, void, void, void, RC_NOCACHE, ST), 261 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), 262 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT), 263 }; 264 265 struct svc_version nfsd_acl_version3 = { 266 .vs_vers = 3, 267 .vs_nproc = 3, 268 .vs_proc = nfsd_acl_procedures3, 269 .vs_dispatch = nfsd_dispatch, 270 .vs_xdrsize = NFS3_SVC_XDRSIZE, 271 .vs_hidden = 0, 272 }; 273 274