4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
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10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/llite/remote_perm.c
38 * Lustre Permission Cache for Remote Client
40 * Author: Lai Siyao <lsy@clusterfs.com>
41 * Author: Fan Yong <fanyong@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_LLITE
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/version.h>
49 #include <linux/user_namespace.h>
50 #ifdef HAVE_UIDGID_HEADER
51 # include <linux/uidgid.h>
54 #include <lustre_ha.h>
55 #include <lustre_dlm.h>
56 #include <lprocfs_status.h>
57 #include <lustre_disk.h>
58 #include <lustre_param.h>
59 #include "llite_internal.h"
61 struct kmem_cache *ll_remote_perm_cachep;
62 struct kmem_cache *ll_rmtperm_hash_cachep;
64 static inline struct ll_remote_perm *alloc_ll_remote_perm(void)
66 struct ll_remote_perm *lrp;
68 OBD_SLAB_ALLOC_PTR_GFP(lrp, ll_remote_perm_cachep, GFP_KERNEL);
70 INIT_HLIST_NODE(&lrp->lrp_list);
74 static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
79 if (!hlist_unhashed(&lrp->lrp_list))
80 hlist_del(&lrp->lrp_list);
81 OBD_SLAB_FREE(lrp, ll_remote_perm_cachep, sizeof(*lrp));
84 static struct hlist_head *alloc_rmtperm_hash(void)
86 struct hlist_head *hash;
89 OBD_SLAB_ALLOC_GFP(hash, ll_rmtperm_hash_cachep,
90 REMOTE_PERM_HASHSIZE * sizeof(*hash),
95 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
96 INIT_HLIST_HEAD(hash + i);
101 void free_rmtperm_hash(struct hlist_head *hash)
104 struct ll_remote_perm *lrp;
105 struct hlist_node __maybe_unused *node;
106 struct hlist_node *next;
111 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
112 cfs_hlist_for_each_entry_safe(lrp, node, next, hash + i,
114 free_ll_remote_perm(lrp);
115 OBD_SLAB_FREE(hash, ll_rmtperm_hash_cachep,
116 REMOTE_PERM_HASHSIZE * sizeof(*hash));
119 static inline int remote_perm_hashfunc(uid_t uid)
121 return uid & (REMOTE_PERM_HASHSIZE - 1);
124 /* NB: setxid permission is not checked here, instead it's done on
125 * MDT when client get remote permission. */
126 static int do_check_remote_perm(struct ll_inode_info *lli, int mask)
128 struct hlist_head *head;
129 struct ll_remote_perm *lrp;
130 struct hlist_node __maybe_unused *node;
134 if (!lli->lli_remote_perms)
137 head = lli->lli_remote_perms +
138 remote_perm_hashfunc(from_kuid(&init_user_ns, current_uid()));
140 spin_lock(&lli->lli_lock);
141 cfs_hlist_for_each_entry(lrp, node, head, lrp_list) {
142 if (lrp->lrp_uid != from_kuid(&init_user_ns, current_uid()))
144 if (lrp->lrp_gid != from_kgid(&init_user_ns, current_gid()))
146 if (lrp->lrp_fsuid != from_kuid(&init_user_ns, current_fsuid()))
148 if (lrp->lrp_fsgid != from_kgid(&init_user_ns, current_fsgid()))
155 GOTO(out, rc = -ENOENT);
157 CDEBUG(D_SEC, "found remote perm: %u/%u/%u/%u - %#x\n",
158 lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
159 lrp->lrp_access_perm);
160 rc = ((lrp->lrp_access_perm & mask) == mask) ? 0 : -EACCES;
163 spin_unlock(&lli->lli_lock);
167 int ll_update_remote_perm(struct inode *inode, struct mdt_remote_perm *perm)
169 struct ll_inode_info *lli = ll_i2info(inode);
170 struct ll_remote_perm *lrp = NULL, *tmp = NULL;
171 struct hlist_head *head, *perm_hash = NULL;
172 struct hlist_node __maybe_unused *node;
175 LASSERT(ll_i2sbi(inode)->ll_flags & LL_SBI_RMT_CLIENT);
178 if (perm->rp_uid != current->uid ||
179 perm->rp_gid != current->gid ||
180 perm->rp_fsuid != current->fsuid ||
181 perm->rp_fsgid != current->fsgid) {
182 /* user might setxid in this small period */
184 "remote perm user %u/%u/%u/%u != current %u/%u/%u/%u\n",
185 perm->rp_uid, perm->rp_gid, perm->rp_fsuid,
186 perm->rp_fsgid, current->uid, current->gid,
187 current->fsuid, current->fsgid);
192 if (!lli->lli_remote_perms) {
193 perm_hash = alloc_rmtperm_hash();
194 if (perm_hash == NULL) {
195 CERROR("alloc lli_remote_perms failed!\n");
200 spin_lock(&lli->lli_lock);
202 if (!lli->lli_remote_perms)
203 lli->lli_remote_perms = perm_hash;
205 free_rmtperm_hash(perm_hash);
207 head = lli->lli_remote_perms + remote_perm_hashfunc(perm->rp_uid);
210 cfs_hlist_for_each_entry(tmp, node, head, lrp_list) {
211 if (tmp->lrp_uid != perm->rp_uid)
213 if (tmp->lrp_gid != perm->rp_gid)
215 if (tmp->lrp_fsuid != perm->rp_fsuid)
217 if (tmp->lrp_fsgid != perm->rp_fsgid)
220 free_ll_remote_perm(lrp);
226 spin_unlock(&lli->lli_lock);
227 lrp = alloc_ll_remote_perm();
229 CERROR("alloc memory for ll_remote_perm failed!\n");
232 spin_lock(&lli->lli_lock);
236 lrp->lrp_access_perm = perm->rp_access_perm;
238 lrp->lrp_uid = perm->rp_uid;
239 lrp->lrp_gid = perm->rp_gid;
240 lrp->lrp_fsuid = perm->rp_fsuid;
241 lrp->lrp_fsgid = perm->rp_fsgid;
242 hlist_add_head(&lrp->lrp_list, head);
244 lli->lli_rmtperm_time = cfs_time_current();
245 spin_unlock(&lli->lli_lock);
247 CDEBUG(D_SEC, "new remote perm@%p: %u/%u/%u/%u - %#x\n",
248 lrp, lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
249 lrp->lrp_access_perm);
254 int lustre_check_remote_perm(struct inode *inode, int mask)
256 struct ll_inode_info *lli = ll_i2info(inode);
257 struct ll_sb_info *sbi = ll_i2sbi(inode);
258 struct ptlrpc_request *req = NULL;
259 struct mdt_remote_perm *perm;
265 save = lli->lli_rmtperm_time;
266 rc = do_check_remote_perm(lli, mask);
267 if (!rc || (rc != -ENOENT && i))
272 mutex_lock(&lli->lli_rmtperm_mutex);
274 if (save != lli->lli_rmtperm_time) {
275 rc = do_check_remote_perm(lli, mask);
276 if (!rc || (rc != -ENOENT && i)) {
277 mutex_unlock(&lli->lli_rmtperm_mutex);
283 CERROR("check remote perm falls in dead loop!\n");
287 rc = md_get_remote_perm(sbi->ll_md_exp, ll_inode2fid(inode),
288 ll_i2suppgid(inode), &req);
290 mutex_unlock(&lli->lli_rmtperm_mutex);
294 perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
295 lustre_swab_mdt_remote_perm);
296 if (unlikely(perm == NULL)) {
297 mutex_unlock(&lli->lli_rmtperm_mutex);
302 rc = ll_update_remote_perm(inode, perm);
303 mutex_unlock(&lli->lli_rmtperm_mutex);
307 ptlrpc_req_finished(req);
310 ptlrpc_req_finished(req);