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 = d_inode(fh->fh_dentry); 43 44 if (argp->mask & ~NFS_ACL_MASK) 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 = d_inode(fh->fh_dentry); 98 99 error = fh_want_write(fh); 100 if (error) 101 goto out_errno; 102 103 fh_lock(fh); 104 105 error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); 106 if (error) 107 goto out_drop_lock; 108 error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); 109 110 out_drop_lock: 111 fh_unlock(fh); 112 fh_drop_write(fh); 113 out_errno: 114 nfserr = nfserrno(error); 115 out: 116 /* argp->acl_{access,default} may have been allocated in 117 nfs3svc_decode_setaclargs. */ 118 posix_acl_release(argp->acl_access); 119 posix_acl_release(argp->acl_default); 120 RETURN_STATUS(nfserr); 121 } 122 123 /* 124 * XDR decode functions 125 */ 126 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p, 127 struct nfsd3_getaclargs *args) 128 { 129 p = nfs3svc_decode_fh(p, &args->fh); 130 if (!p) 131 return 0; 132 args->mask = ntohl(*p); p++; 133 134 return xdr_argsize_check(rqstp, p); 135 } 136 137 138 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p, 139 struct nfsd3_setaclargs *args) 140 { 141 struct kvec *head = rqstp->rq_arg.head; 142 unsigned int base; 143 int n; 144 145 p = nfs3svc_decode_fh(p, &args->fh); 146 if (!p) 147 return 0; 148 args->mask = ntohl(*p++); 149 if (args->mask & ~NFS_ACL_MASK || 150 !xdr_argsize_check(rqstp, p)) 151 return 0; 152 153 base = (char *)p - (char *)head->iov_base; 154 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 155 (args->mask & NFS_ACL) ? 156 &args->acl_access : NULL); 157 if (n > 0) 158 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 159 (args->mask & NFS_DFACL) ? 160 &args->acl_default : NULL); 161 return (n > 0); 162 } 163 164 /* 165 * XDR encode functions 166 */ 167 168 /* GETACL */ 169 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p, 170 struct nfsd3_getaclres *resp) 171 { 172 struct dentry *dentry = resp->fh.fh_dentry; 173 174 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 175 if (resp->status == 0 && dentry && d_really_is_positive(dentry)) { 176 struct inode *inode = d_inode(dentry); 177 struct kvec *head = rqstp->rq_res.head; 178 unsigned int base; 179 int n; 180 int w; 181 182 *p++ = htonl(resp->mask); 183 if (!xdr_ressize_check(rqstp, p)) 184 return 0; 185 base = (char *)p - (char *)head->iov_base; 186 187 rqstp->rq_res.page_len = w = nfsacl_size( 188 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 189 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 190 while (w > 0) { 191 if (!*(rqstp->rq_next_page++)) 192 return 0; 193 w -= PAGE_SIZE; 194 } 195 196 n = nfsacl_encode(&rqstp->rq_res, base, inode, 197 resp->acl_access, 198 resp->mask & NFS_ACL, 0); 199 if (n > 0) 200 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 201 resp->acl_default, 202 resp->mask & NFS_DFACL, 203 NFS_ACL_DEFAULT); 204 if (n <= 0) 205 return 0; 206 } else 207 if (!xdr_ressize_check(rqstp, p)) 208 return 0; 209 210 return 1; 211 } 212 213 /* SETACL */ 214 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p, 215 struct nfsd3_attrstat *resp) 216 { 217 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 218 219 return xdr_ressize_check(rqstp, p); 220 } 221 222 /* 223 * XDR release functions 224 */ 225 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p, 226 struct nfsd3_getaclres *resp) 227 { 228 fh_put(&resp->fh); 229 posix_acl_release(resp->acl_access); 230 posix_acl_release(resp->acl_default); 231 return 1; 232 } 233 234 #define nfs3svc_decode_voidargs NULL 235 #define nfs3svc_release_void NULL 236 #define nfsd3_setaclres nfsd3_attrstat 237 #define nfsd3_voidres nfsd3_voidargs 238 struct nfsd3_voidargs { int dummy; }; 239 240 #define PROC(name, argt, rest, relt, cache, respsize) \ 241 { (svc_procfunc) nfsd3_proc_##name, \ 242 (kxdrproc_t) nfs3svc_decode_##argt##args, \ 243 (kxdrproc_t) nfs3svc_encode_##rest##res, \ 244 (kxdrproc_t) nfs3svc_release_##relt, \ 245 sizeof(struct nfsd3_##argt##args), \ 246 sizeof(struct nfsd3_##rest##res), \ 247 0, \ 248 cache, \ 249 respsize, \ 250 } 251 252 #define ST 1 /* status*/ 253 #define AT 21 /* attributes */ 254 #define pAT (1+AT) /* post attributes - conditional */ 255 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 256 257 static struct svc_procedure nfsd_acl_procedures3[] = { 258 PROC(null, void, void, void, RC_NOCACHE, ST), 259 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), 260 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT), 261 }; 262 263 struct svc_version nfsd_acl_version3 = { 264 .vs_vers = 3, 265 .vs_nproc = 3, 266 .vs_proc = nfsd_acl_procedures3, 267 .vs_dispatch = nfsd_dispatch, 268 .vs_xdrsize = NFS3_SVC_XDRSIZE, 269 }; 270 271