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 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 86 fail: 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 */ 95 static __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 */ 124 static 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 } 133 134 135 static 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 */ 165 static 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 */ 210 static 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 */ 221 static 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 234 struct 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 */ 252 253 static 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 }; 258 259 struct 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