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1393 lines
35 KiB
1393 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* NFS exporting and validation. |
|
* |
|
* We maintain a list of clients, each of which has a list of |
|
* exports. To export an fs to a given client, you first have |
|
* to create the client entry with NFSCTL_ADDCLIENT, which |
|
* creates a client control block and adds it to the hash |
|
* table. Then, you call NFSCTL_EXPORT for each fs. |
|
* |
|
* |
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* Copyright (C) 1995, 1996 Olaf Kirch, <[email protected]> |
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*/ |
|
|
|
#include <linux/slab.h> |
|
#include <linux/namei.h> |
|
#include <linux/module.h> |
|
#include <linux/exportfs.h> |
|
#include <linux/sunrpc/svc_xprt.h> |
|
|
|
#include "nfsd.h" |
|
#include "nfsfh.h" |
|
#include "netns.h" |
|
#include "pnfs.h" |
|
#include "filecache.h" |
|
#include "trace.h" |
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_EXPORT |
|
|
|
/* |
|
* We have two caches. |
|
* One maps client+vfsmnt+dentry to export options - the export map |
|
* The other maps client+filehandle-fragment to export options. - the expkey map |
|
* |
|
* The export options are actually stored in the first map, and the |
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* second map contains a reference to the entry in the first map. |
|
*/ |
|
|
|
#define EXPKEY_HASHBITS 8 |
|
#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) |
|
#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) |
|
|
|
static void expkey_put(struct kref *ref) |
|
{ |
|
struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
|
|
|
if (test_bit(CACHE_VALID, &key->h.flags) && |
|
!test_bit(CACHE_NEGATIVE, &key->h.flags)) |
|
path_put(&key->ek_path); |
|
auth_domain_put(key->ek_client); |
|
kfree_rcu(key, ek_rcu); |
|
} |
|
|
|
static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
|
{ |
|
return sunrpc_cache_pipe_upcall(cd, h); |
|
} |
|
|
|
static void expkey_request(struct cache_detail *cd, |
|
struct cache_head *h, |
|
char **bpp, int *blen) |
|
{ |
|
/* client fsidtype \xfsid */ |
|
struct svc_expkey *ek = container_of(h, struct svc_expkey, h); |
|
char type[5]; |
|
|
|
qword_add(bpp, blen, ek->ek_client->name); |
|
snprintf(type, 5, "%d", ek->ek_fsidtype); |
|
qword_add(bpp, blen, type); |
|
qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); |
|
(*bpp)[-1] = '\n'; |
|
} |
|
|
|
static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
|
struct svc_expkey *old); |
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static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); |
|
|
|
static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
|
{ |
|
/* client fsidtype fsid expiry [path] */ |
|
char *buf; |
|
int len; |
|
struct auth_domain *dom = NULL; |
|
int err; |
|
int fsidtype; |
|
char *ep; |
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struct svc_expkey key; |
|
struct svc_expkey *ek = NULL; |
|
|
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if (mesg[mlen - 1] != '\n') |
|
return -EINVAL; |
|
mesg[mlen-1] = 0; |
|
|
|
buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
|
err = -ENOMEM; |
|
if (!buf) |
|
goto out; |
|
|
|
err = -EINVAL; |
|
if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
|
goto out; |
|
|
|
err = -ENOENT; |
|
dom = auth_domain_find(buf); |
|
if (!dom) |
|
goto out; |
|
dprintk("found domain %s\n", buf); |
|
|
|
err = -EINVAL; |
|
if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
|
goto out; |
|
fsidtype = simple_strtoul(buf, &ep, 10); |
|
if (*ep) |
|
goto out; |
|
dprintk("found fsidtype %d\n", fsidtype); |
|
if (key_len(fsidtype)==0) /* invalid type */ |
|
goto out; |
|
if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
|
goto out; |
|
dprintk("found fsid length %d\n", len); |
|
if (len != key_len(fsidtype)) |
|
goto out; |
|
|
|
/* OK, we seem to have a valid key */ |
|
key.h.flags = 0; |
|
key.h.expiry_time = get_expiry(&mesg); |
|
if (key.h.expiry_time == 0) |
|
goto out; |
|
|
|
key.ek_client = dom; |
|
key.ek_fsidtype = fsidtype; |
|
memcpy(key.ek_fsid, buf, len); |
|
|
|
ek = svc_expkey_lookup(cd, &key); |
|
err = -ENOMEM; |
|
if (!ek) |
|
goto out; |
|
|
|
/* now we want a pathname, or empty meaning NEGATIVE */ |
|
err = -EINVAL; |
|
len = qword_get(&mesg, buf, PAGE_SIZE); |
|
if (len < 0) |
|
goto out; |
|
dprintk("Path seems to be <%s>\n", buf); |
|
err = 0; |
|
if (len == 0) { |
|
set_bit(CACHE_NEGATIVE, &key.h.flags); |
|
ek = svc_expkey_update(cd, &key, ek); |
|
if (ek) |
|
trace_nfsd_expkey_update(ek, NULL); |
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else |
|
err = -ENOMEM; |
|
} else { |
|
err = kern_path(buf, 0, &key.ek_path); |
|
if (err) |
|
goto out; |
|
|
|
dprintk("Found the path %s\n", buf); |
|
|
|
ek = svc_expkey_update(cd, &key, ek); |
|
if (ek) |
|
trace_nfsd_expkey_update(ek, buf); |
|
else |
|
err = -ENOMEM; |
|
path_put(&key.ek_path); |
|
} |
|
cache_flush(); |
|
out: |
|
if (ek) |
|
cache_put(&ek->h, cd); |
|
if (dom) |
|
auth_domain_put(dom); |
|
kfree(buf); |
|
return err; |
|
} |
|
|
|
static int expkey_show(struct seq_file *m, |
|
struct cache_detail *cd, |
|
struct cache_head *h) |
|
{ |
|
struct svc_expkey *ek ; |
|
int i; |
|
|
|
if (h ==NULL) { |
|
seq_puts(m, "#domain fsidtype fsid [path]\n"); |
|
return 0; |
|
} |
|
ek = container_of(h, struct svc_expkey, h); |
|
seq_printf(m, "%s %d 0x", ek->ek_client->name, |
|
ek->ek_fsidtype); |
|
for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) |
|
seq_printf(m, "%08x", ek->ek_fsid[i]); |
|
if (test_bit(CACHE_VALID, &h->flags) && |
|
!test_bit(CACHE_NEGATIVE, &h->flags)) { |
|
seq_printf(m, " "); |
|
seq_path(m, &ek->ek_path, "\\ \t\n"); |
|
} |
|
seq_printf(m, "\n"); |
|
return 0; |
|
} |
|
|
|
static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
|
{ |
|
struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
|
struct svc_expkey *new = container_of(b, struct svc_expkey, h); |
|
|
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if (orig->ek_fsidtype != new->ek_fsidtype || |
|
orig->ek_client != new->ek_client || |
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memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) |
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return 0; |
|
return 1; |
|
} |
|
|
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static inline void expkey_init(struct cache_head *cnew, |
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struct cache_head *citem) |
|
{ |
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struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
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struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
|
|
|
kref_get(&item->ek_client->ref); |
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new->ek_client = item->ek_client; |
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new->ek_fsidtype = item->ek_fsidtype; |
|
|
|
memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); |
|
} |
|
|
|
static inline void expkey_update(struct cache_head *cnew, |
|
struct cache_head *citem) |
|
{ |
|
struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
|
struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
|
|
|
new->ek_path = item->ek_path; |
|
path_get(&item->ek_path); |
|
} |
|
|
|
static struct cache_head *expkey_alloc(void) |
|
{ |
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struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); |
|
if (i) |
|
return &i->h; |
|
else |
|
return NULL; |
|
} |
|
|
|
static void expkey_flush(void) |
|
{ |
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/* |
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* Take the nfsd_mutex here to ensure that the file cache is not |
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* destroyed while we're in the middle of flushing. |
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*/ |
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mutex_lock(&nfsd_mutex); |
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nfsd_file_cache_purge(current->nsproxy->net_ns); |
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mutex_unlock(&nfsd_mutex); |
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} |
|
|
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static const struct cache_detail svc_expkey_cache_template = { |
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.owner = THIS_MODULE, |
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.hash_size = EXPKEY_HASHMAX, |
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.name = "nfsd.fh", |
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.cache_put = expkey_put, |
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.cache_upcall = expkey_upcall, |
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.cache_request = expkey_request, |
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.cache_parse = expkey_parse, |
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.cache_show = expkey_show, |
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.match = expkey_match, |
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.init = expkey_init, |
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.update = expkey_update, |
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.alloc = expkey_alloc, |
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.flush = expkey_flush, |
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}; |
|
|
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static int |
|
svc_expkey_hash(struct svc_expkey *item) |
|
{ |
|
int hash = item->ek_fsidtype; |
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char * cp = (char*)item->ek_fsid; |
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int len = key_len(item->ek_fsidtype); |
|
|
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hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); |
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hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); |
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hash &= EXPKEY_HASHMASK; |
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return hash; |
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} |
|
|
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static struct svc_expkey * |
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svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
|
{ |
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struct cache_head *ch; |
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int hash = svc_expkey_hash(item); |
|
|
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ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); |
|
if (ch) |
|
return container_of(ch, struct svc_expkey, h); |
|
else |
|
return NULL; |
|
} |
|
|
|
static struct svc_expkey * |
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svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
|
struct svc_expkey *old) |
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{ |
|
struct cache_head *ch; |
|
int hash = svc_expkey_hash(new); |
|
|
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ch = sunrpc_cache_update(cd, &new->h, &old->h, hash); |
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if (ch) |
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return container_of(ch, struct svc_expkey, h); |
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else |
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return NULL; |
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} |
|
|
|
|
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#define EXPORT_HASHBITS 8 |
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#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) |
|
|
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static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
|
{ |
|
struct nfsd4_fs_location *locations = fsloc->locations; |
|
int i; |
|
|
|
if (!locations) |
|
return; |
|
|
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for (i = 0; i < fsloc->locations_count; i++) { |
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kfree(locations[i].path); |
|
kfree(locations[i].hosts); |
|
} |
|
|
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kfree(locations); |
|
fsloc->locations = NULL; |
|
} |
|
|
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static int export_stats_init(struct export_stats *stats) |
|
{ |
|
stats->start_time = ktime_get_seconds(); |
|
return nfsd_percpu_counters_init(stats->counter, EXP_STATS_COUNTERS_NUM); |
|
} |
|
|
|
static void export_stats_reset(struct export_stats *stats) |
|
{ |
|
nfsd_percpu_counters_reset(stats->counter, EXP_STATS_COUNTERS_NUM); |
|
} |
|
|
|
static void export_stats_destroy(struct export_stats *stats) |
|
{ |
|
nfsd_percpu_counters_destroy(stats->counter, EXP_STATS_COUNTERS_NUM); |
|
} |
|
|
|
static void svc_export_put(struct kref *ref) |
|
{ |
|
struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
|
path_put(&exp->ex_path); |
|
auth_domain_put(exp->ex_client); |
|
nfsd4_fslocs_free(&exp->ex_fslocs); |
|
export_stats_destroy(&exp->ex_stats); |
|
kfree(exp->ex_uuid); |
|
kfree_rcu(exp, ex_rcu); |
|
} |
|
|
|
static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
|
{ |
|
return sunrpc_cache_pipe_upcall(cd, h); |
|
} |
|
|
|
static void svc_export_request(struct cache_detail *cd, |
|
struct cache_head *h, |
|
char **bpp, int *blen) |
|
{ |
|
/* client path */ |
|
struct svc_export *exp = container_of(h, struct svc_export, h); |
|
char *pth; |
|
|
|
qword_add(bpp, blen, exp->ex_client->name); |
|
pth = d_path(&exp->ex_path, *bpp, *blen); |
|
if (IS_ERR(pth)) { |
|
/* is this correct? */ |
|
(*bpp)[0] = '\n'; |
|
return; |
|
} |
|
qword_add(bpp, blen, pth); |
|
(*bpp)[-1] = '\n'; |
|
} |
|
|
|
static struct svc_export *svc_export_update(struct svc_export *new, |
|
struct svc_export *old); |
|
static struct svc_export *svc_export_lookup(struct svc_export *); |
|
|
|
static int check_export(struct path *path, int *flags, unsigned char *uuid) |
|
{ |
|
struct inode *inode = d_inode(path->dentry); |
|
|
|
/* |
|
* We currently export only dirs, regular files, and (for v4 |
|
* pseudoroot) symlinks. |
|
*/ |
|
if (!S_ISDIR(inode->i_mode) && |
|
!S_ISLNK(inode->i_mode) && |
|
!S_ISREG(inode->i_mode)) |
|
return -ENOTDIR; |
|
|
|
/* |
|
* Mountd should never pass down a writeable V4ROOT export, but, |
|
* just to make sure: |
|
*/ |
|
if (*flags & NFSEXP_V4ROOT) |
|
*flags |= NFSEXP_READONLY; |
|
|
|
/* There are two requirements on a filesystem to be exportable. |
|
* 1: We must be able to identify the filesystem from a number. |
|
* either a device number (so FS_REQUIRES_DEV needed) |
|
* or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
|
* 2: We must be able to find an inode from a filehandle. |
|
* This means that s_export_op must be set. |
|
* 3: We must not currently be on an idmapped mount. |
|
*/ |
|
if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && |
|
!(*flags & NFSEXP_FSID) && |
|
uuid == NULL) { |
|
dprintk("exp_export: export of non-dev fs without fsid\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (!inode->i_sb->s_export_op || |
|
!inode->i_sb->s_export_op->fh_to_dentry) { |
|
dprintk("exp_export: export of invalid fs type.\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (is_idmapped_mnt(path->mnt)) { |
|
dprintk("exp_export: export of idmapped mounts not yet supported.\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK && |
|
!(*flags & NFSEXP_NOSUBTREECHECK)) { |
|
dprintk("%s: %s does not support subtree checking!\n", |
|
__func__, inode->i_sb->s_type->name); |
|
return -EINVAL; |
|
} |
|
return 0; |
|
|
|
} |
|
|
|
#ifdef CONFIG_NFSD_V4 |
|
|
|
static int |
|
fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) |
|
{ |
|
int len; |
|
int migrated, i, err; |
|
|
|
/* more than one fsloc */ |
|
if (fsloc->locations) |
|
return -EINVAL; |
|
|
|
/* listsize */ |
|
err = get_uint(mesg, &fsloc->locations_count); |
|
if (err) |
|
return err; |
|
if (fsloc->locations_count > MAX_FS_LOCATIONS) |
|
return -EINVAL; |
|
if (fsloc->locations_count == 0) |
|
return 0; |
|
|
|
fsloc->locations = kcalloc(fsloc->locations_count, |
|
sizeof(struct nfsd4_fs_location), |
|
GFP_KERNEL); |
|
if (!fsloc->locations) |
|
return -ENOMEM; |
|
for (i=0; i < fsloc->locations_count; i++) { |
|
/* colon separated host list */ |
|
err = -EINVAL; |
|
len = qword_get(mesg, buf, PAGE_SIZE); |
|
if (len <= 0) |
|
goto out_free_all; |
|
err = -ENOMEM; |
|
fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); |
|
if (!fsloc->locations[i].hosts) |
|
goto out_free_all; |
|
err = -EINVAL; |
|
/* slash separated path component list */ |
|
len = qword_get(mesg, buf, PAGE_SIZE); |
|
if (len <= 0) |
|
goto out_free_all; |
|
err = -ENOMEM; |
|
fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); |
|
if (!fsloc->locations[i].path) |
|
goto out_free_all; |
|
} |
|
/* migrated */ |
|
err = get_int(mesg, &migrated); |
|
if (err) |
|
goto out_free_all; |
|
err = -EINVAL; |
|
if (migrated < 0 || migrated > 1) |
|
goto out_free_all; |
|
fsloc->migrated = migrated; |
|
return 0; |
|
out_free_all: |
|
nfsd4_fslocs_free(fsloc); |
|
return err; |
|
} |
|
|
|
static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
|
{ |
|
struct exp_flavor_info *f; |
|
u32 listsize; |
|
int err; |
|
|
|
/* more than one secinfo */ |
|
if (exp->ex_nflavors) |
|
return -EINVAL; |
|
|
|
err = get_uint(mesg, &listsize); |
|
if (err) |
|
return err; |
|
if (listsize > MAX_SECINFO_LIST) |
|
return -EINVAL; |
|
|
|
for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { |
|
err = get_uint(mesg, &f->pseudoflavor); |
|
if (err) |
|
return err; |
|
/* |
|
* XXX: It would be nice to also check whether this |
|
* pseudoflavor is supported, so we can discover the |
|
* problem at export time instead of when a client fails |
|
* to authenticate. |
|
*/ |
|
err = get_uint(mesg, &f->flags); |
|
if (err) |
|
return err; |
|
/* Only some flags are allowed to differ between flavors: */ |
|
if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) |
|
return -EINVAL; |
|
} |
|
exp->ex_nflavors = listsize; |
|
return 0; |
|
} |
|
|
|
#else /* CONFIG_NFSD_V4 */ |
|
static inline int |
|
fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} |
|
static inline int |
|
secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } |
|
#endif |
|
|
|
static inline int |
|
nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid) |
|
{ |
|
int len; |
|
|
|
/* more than one uuid */ |
|
if (*puuid) |
|
return -EINVAL; |
|
|
|
/* expect a 16 byte uuid encoded as \xXXXX... */ |
|
len = qword_get(mesg, buf, PAGE_SIZE); |
|
if (len != EX_UUID_LEN) |
|
return -EINVAL; |
|
|
|
*puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL); |
|
if (*puuid == NULL) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
|
{ |
|
/* client path expiry [flags anonuid anongid fsid] */ |
|
char *buf; |
|
int len; |
|
int err; |
|
struct auth_domain *dom = NULL; |
|
struct svc_export exp = {}, *expp; |
|
int an_int; |
|
|
|
if (mesg[mlen-1] != '\n') |
|
return -EINVAL; |
|
mesg[mlen-1] = 0; |
|
|
|
buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
|
if (!buf) |
|
return -ENOMEM; |
|
|
|
/* client */ |
|
err = -EINVAL; |
|
len = qword_get(&mesg, buf, PAGE_SIZE); |
|
if (len <= 0) |
|
goto out; |
|
|
|
err = -ENOENT; |
|
dom = auth_domain_find(buf); |
|
if (!dom) |
|
goto out; |
|
|
|
/* path */ |
|
err = -EINVAL; |
|
if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
|
goto out1; |
|
|
|
err = kern_path(buf, 0, &exp.ex_path); |
|
if (err) |
|
goto out1; |
|
|
|
exp.ex_client = dom; |
|
exp.cd = cd; |
|
exp.ex_devid_map = NULL; |
|
|
|
/* expiry */ |
|
err = -EINVAL; |
|
exp.h.expiry_time = get_expiry(&mesg); |
|
if (exp.h.expiry_time == 0) |
|
goto out3; |
|
|
|
/* flags */ |
|
err = get_int(&mesg, &an_int); |
|
if (err == -ENOENT) { |
|
err = 0; |
|
set_bit(CACHE_NEGATIVE, &exp.h.flags); |
|
} else { |
|
if (err || an_int < 0) |
|
goto out3; |
|
exp.ex_flags= an_int; |
|
|
|
/* anon uid */ |
|
err = get_int(&mesg, &an_int); |
|
if (err) |
|
goto out3; |
|
exp.ex_anon_uid= make_kuid(current_user_ns(), an_int); |
|
|
|
/* anon gid */ |
|
err = get_int(&mesg, &an_int); |
|
if (err) |
|
goto out3; |
|
exp.ex_anon_gid= make_kgid(current_user_ns(), an_int); |
|
|
|
/* fsid */ |
|
err = get_int(&mesg, &an_int); |
|
if (err) |
|
goto out3; |
|
exp.ex_fsid = an_int; |
|
|
|
while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
|
if (strcmp(buf, "fsloc") == 0) |
|
err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); |
|
else if (strcmp(buf, "uuid") == 0) |
|
err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid); |
|
else if (strcmp(buf, "secinfo") == 0) |
|
err = secinfo_parse(&mesg, buf, &exp); |
|
else |
|
/* quietly ignore unknown words and anything |
|
* following. Newer user-space can try to set |
|
* new values, then see what the result was. |
|
*/ |
|
break; |
|
if (err) |
|
goto out4; |
|
} |
|
|
|
err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid); |
|
if (err) |
|
goto out4; |
|
/* |
|
* No point caching this if it would immediately expire. |
|
* Also, this protects exportfs's dummy export from the |
|
* anon_uid/anon_gid checks: |
|
*/ |
|
if (exp.h.expiry_time < seconds_since_boot()) |
|
goto out4; |
|
/* |
|
* For some reason exportfs has been passing down an |
|
* invalid (-1) uid & gid on the "dummy" export which it |
|
* uses to test export support. To make sure exportfs |
|
* sees errors from check_export we therefore need to |
|
* delay these checks till after check_export: |
|
*/ |
|
err = -EINVAL; |
|
if (!uid_valid(exp.ex_anon_uid)) |
|
goto out4; |
|
if (!gid_valid(exp.ex_anon_gid)) |
|
goto out4; |
|
err = 0; |
|
|
|
nfsd4_setup_layout_type(&exp); |
|
} |
|
|
|
expp = svc_export_lookup(&exp); |
|
if (!expp) { |
|
err = -ENOMEM; |
|
goto out4; |
|
} |
|
expp = svc_export_update(&exp, expp); |
|
if (expp) { |
|
trace_nfsd_export_update(expp); |
|
cache_flush(); |
|
exp_put(expp); |
|
} else |
|
err = -ENOMEM; |
|
out4: |
|
nfsd4_fslocs_free(&exp.ex_fslocs); |
|
kfree(exp.ex_uuid); |
|
out3: |
|
path_put(&exp.ex_path); |
|
out1: |
|
auth_domain_put(dom); |
|
out: |
|
kfree(buf); |
|
return err; |
|
} |
|
|
|
static void exp_flags(struct seq_file *m, int flag, int fsid, |
|
kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs); |
|
static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
|
|
|
static int is_export_stats_file(struct seq_file *m) |
|
{ |
|
/* |
|
* The export_stats file uses the same ops as the exports file. |
|
* We use the file's name to determine the reported info per export. |
|
* There is no rename in nsfdfs, so d_name.name is stable. |
|
*/ |
|
return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats"); |
|
} |
|
|
|
static int svc_export_show(struct seq_file *m, |
|
struct cache_detail *cd, |
|
struct cache_head *h) |
|
{ |
|
struct svc_export *exp; |
|
bool export_stats = is_export_stats_file(m); |
|
|
|
if (h == NULL) { |
|
if (export_stats) |
|
seq_puts(m, "#path domain start-time\n#\tstats\n"); |
|
else |
|
seq_puts(m, "#path domain(flags)\n"); |
|
return 0; |
|
} |
|
exp = container_of(h, struct svc_export, h); |
|
seq_path(m, &exp->ex_path, " \t\n\\"); |
|
seq_putc(m, '\t'); |
|
seq_escape(m, exp->ex_client->name, " \t\n\\"); |
|
if (export_stats) { |
|
seq_printf(m, "\t%lld\n", exp->ex_stats.start_time); |
|
seq_printf(m, "\tfh_stale: %lld\n", |
|
percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_FH_STALE])); |
|
seq_printf(m, "\tio_read: %lld\n", |
|
percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_IO_READ])); |
|
seq_printf(m, "\tio_write: %lld\n", |
|
percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_IO_WRITE])); |
|
seq_putc(m, '\n'); |
|
return 0; |
|
} |
|
seq_putc(m, '('); |
|
if (test_bit(CACHE_VALID, &h->flags) && |
|
!test_bit(CACHE_NEGATIVE, &h->flags)) { |
|
exp_flags(m, exp->ex_flags, exp->ex_fsid, |
|
exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); |
|
if (exp->ex_uuid) { |
|
int i; |
|
seq_puts(m, ",uuid="); |
|
for (i = 0; i < EX_UUID_LEN; i++) { |
|
if ((i&3) == 0 && i) |
|
seq_putc(m, ':'); |
|
seq_printf(m, "%02x", exp->ex_uuid[i]); |
|
} |
|
} |
|
show_secinfo(m, exp); |
|
} |
|
seq_puts(m, ")\n"); |
|
return 0; |
|
} |
|
static int svc_export_match(struct cache_head *a, struct cache_head *b) |
|
{ |
|
struct svc_export *orig = container_of(a, struct svc_export, h); |
|
struct svc_export *new = container_of(b, struct svc_export, h); |
|
return orig->ex_client == new->ex_client && |
|
path_equal(&orig->ex_path, &new->ex_path); |
|
} |
|
|
|
static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) |
|
{ |
|
struct svc_export *new = container_of(cnew, struct svc_export, h); |
|
struct svc_export *item = container_of(citem, struct svc_export, h); |
|
|
|
kref_get(&item->ex_client->ref); |
|
new->ex_client = item->ex_client; |
|
new->ex_path = item->ex_path; |
|
path_get(&item->ex_path); |
|
new->ex_fslocs.locations = NULL; |
|
new->ex_fslocs.locations_count = 0; |
|
new->ex_fslocs.migrated = 0; |
|
new->ex_layout_types = 0; |
|
new->ex_uuid = NULL; |
|
new->cd = item->cd; |
|
export_stats_reset(&new->ex_stats); |
|
} |
|
|
|
static void export_update(struct cache_head *cnew, struct cache_head *citem) |
|
{ |
|
struct svc_export *new = container_of(cnew, struct svc_export, h); |
|
struct svc_export *item = container_of(citem, struct svc_export, h); |
|
int i; |
|
|
|
new->ex_flags = item->ex_flags; |
|
new->ex_anon_uid = item->ex_anon_uid; |
|
new->ex_anon_gid = item->ex_anon_gid; |
|
new->ex_fsid = item->ex_fsid; |
|
new->ex_devid_map = item->ex_devid_map; |
|
item->ex_devid_map = NULL; |
|
new->ex_uuid = item->ex_uuid; |
|
item->ex_uuid = NULL; |
|
new->ex_fslocs.locations = item->ex_fslocs.locations; |
|
item->ex_fslocs.locations = NULL; |
|
new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; |
|
item->ex_fslocs.locations_count = 0; |
|
new->ex_fslocs.migrated = item->ex_fslocs.migrated; |
|
item->ex_fslocs.migrated = 0; |
|
new->ex_layout_types = item->ex_layout_types; |
|
new->ex_nflavors = item->ex_nflavors; |
|
for (i = 0; i < MAX_SECINFO_LIST; i++) { |
|
new->ex_flavors[i] = item->ex_flavors[i]; |
|
} |
|
} |
|
|
|
static struct cache_head *svc_export_alloc(void) |
|
{ |
|
struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); |
|
if (!i) |
|
return NULL; |
|
|
|
if (export_stats_init(&i->ex_stats)) { |
|
kfree(i); |
|
return NULL; |
|
} |
|
|
|
return &i->h; |
|
} |
|
|
|
static const struct cache_detail svc_export_cache_template = { |
|
.owner = THIS_MODULE, |
|
.hash_size = EXPORT_HASHMAX, |
|
.name = "nfsd.export", |
|
.cache_put = svc_export_put, |
|
.cache_upcall = svc_export_upcall, |
|
.cache_request = svc_export_request, |
|
.cache_parse = svc_export_parse, |
|
.cache_show = svc_export_show, |
|
.match = svc_export_match, |
|
.init = svc_export_init, |
|
.update = export_update, |
|
.alloc = svc_export_alloc, |
|
}; |
|
|
|
static int |
|
svc_export_hash(struct svc_export *exp) |
|
{ |
|
int hash; |
|
|
|
hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
|
hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
|
hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); |
|
return hash; |
|
} |
|
|
|
static struct svc_export * |
|
svc_export_lookup(struct svc_export *exp) |
|
{ |
|
struct cache_head *ch; |
|
int hash = svc_export_hash(exp); |
|
|
|
ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash); |
|
if (ch) |
|
return container_of(ch, struct svc_export, h); |
|
else |
|
return NULL; |
|
} |
|
|
|
static struct svc_export * |
|
svc_export_update(struct svc_export *new, struct svc_export *old) |
|
{ |
|
struct cache_head *ch; |
|
int hash = svc_export_hash(old); |
|
|
|
ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash); |
|
if (ch) |
|
return container_of(ch, struct svc_export, h); |
|
else |
|
return NULL; |
|
} |
|
|
|
|
|
static struct svc_expkey * |
|
exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type, |
|
u32 *fsidv, struct cache_req *reqp) |
|
{ |
|
struct svc_expkey key, *ek; |
|
int err; |
|
|
|
if (!clp) |
|
return ERR_PTR(-ENOENT); |
|
|
|
key.ek_client = clp; |
|
key.ek_fsidtype = fsid_type; |
|
memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
|
|
|
ek = svc_expkey_lookup(cd, &key); |
|
if (ek == NULL) |
|
return ERR_PTR(-ENOMEM); |
|
err = cache_check(cd, &ek->h, reqp); |
|
if (err) { |
|
trace_nfsd_exp_find_key(&key, err); |
|
return ERR_PTR(err); |
|
} |
|
return ek; |
|
} |
|
|
|
static struct svc_export * |
|
exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp, |
|
const struct path *path, struct cache_req *reqp) |
|
{ |
|
struct svc_export *exp, key; |
|
int err; |
|
|
|
if (!clp) |
|
return ERR_PTR(-ENOENT); |
|
|
|
key.ex_client = clp; |
|
key.ex_path = *path; |
|
key.cd = cd; |
|
|
|
exp = svc_export_lookup(&key); |
|
if (exp == NULL) |
|
return ERR_PTR(-ENOMEM); |
|
err = cache_check(cd, &exp->h, reqp); |
|
if (err) { |
|
trace_nfsd_exp_get_by_name(&key, err); |
|
return ERR_PTR(err); |
|
} |
|
return exp; |
|
} |
|
|
|
/* |
|
* Find the export entry for a given dentry. |
|
*/ |
|
static struct svc_export * |
|
exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path) |
|
{ |
|
struct dentry *saved = dget(path->dentry); |
|
struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
|
|
|
while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
|
struct dentry *parent = dget_parent(path->dentry); |
|
dput(path->dentry); |
|
path->dentry = parent; |
|
exp = exp_get_by_name(cd, clp, path, NULL); |
|
} |
|
dput(path->dentry); |
|
path->dentry = saved; |
|
return exp; |
|
} |
|
|
|
|
|
|
|
/* |
|
* Obtain the root fh on behalf of a client. |
|
* This could be done in user space, but I feel that it adds some safety |
|
* since its harder to fool a kernel module than a user space program. |
|
*/ |
|
int |
|
exp_rootfh(struct net *net, struct auth_domain *clp, char *name, |
|
struct knfsd_fh *f, int maxsize) |
|
{ |
|
struct svc_export *exp; |
|
struct path path; |
|
struct inode *inode; |
|
struct svc_fh fh; |
|
int err; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
struct cache_detail *cd = nn->svc_export_cache; |
|
|
|
err = -EPERM; |
|
/* NB: we probably ought to check that it's NUL-terminated */ |
|
if (kern_path(name, 0, &path)) { |
|
printk("nfsd: exp_rootfh path not found %s", name); |
|
return err; |
|
} |
|
inode = d_inode(path.dentry); |
|
|
|
dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", |
|
name, path.dentry, clp->name, |
|
inode->i_sb->s_id, inode->i_ino); |
|
exp = exp_parent(cd, clp, &path); |
|
if (IS_ERR(exp)) { |
|
err = PTR_ERR(exp); |
|
goto out; |
|
} |
|
|
|
/* |
|
* fh must be initialized before calling fh_compose |
|
*/ |
|
fh_init(&fh, maxsize); |
|
if (fh_compose(&fh, exp, path.dentry, NULL)) |
|
err = -EINVAL; |
|
else |
|
err = 0; |
|
memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); |
|
fh_put(&fh); |
|
exp_put(exp); |
|
out: |
|
path_put(&path); |
|
return err; |
|
} |
|
|
|
static struct svc_export *exp_find(struct cache_detail *cd, |
|
struct auth_domain *clp, int fsid_type, |
|
u32 *fsidv, struct cache_req *reqp) |
|
{ |
|
struct svc_export *exp; |
|
struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id); |
|
struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); |
|
if (IS_ERR(ek)) |
|
return ERR_CAST(ek); |
|
|
|
exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp); |
|
cache_put(&ek->h, nn->svc_expkey_cache); |
|
|
|
if (IS_ERR(exp)) |
|
return ERR_CAST(exp); |
|
return exp; |
|
} |
|
|
|
__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
|
{ |
|
struct exp_flavor_info *f; |
|
struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; |
|
|
|
/* legacy gss-only clients are always OK: */ |
|
if (exp->ex_client == rqstp->rq_gssclient) |
|
return 0; |
|
/* ip-address based client; check sec= export option: */ |
|
for (f = exp->ex_flavors; f < end; f++) { |
|
if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
|
return 0; |
|
} |
|
/* defaults in absence of sec= options: */ |
|
if (exp->ex_nflavors == 0) { |
|
if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
|
rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) |
|
return 0; |
|
} |
|
|
|
/* If the compound op contains a spo_must_allowed op, |
|
* it will be sent with integrity/protection which |
|
* will have to be expressly allowed on mounts that |
|
* don't support it |
|
*/ |
|
|
|
if (nfsd4_spo_must_allow(rqstp)) |
|
return 0; |
|
|
|
return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec; |
|
} |
|
|
|
/* |
|
* Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
|
* auth_unix client) if it's available and has secinfo information; |
|
* otherwise, will try to use rq_gssclient. |
|
* |
|
* Called from functions that handle requests; functions that do work on |
|
* behalf of mountd are passed a single client name to use, and should |
|
* use exp_get_by_name() or exp_find(). |
|
*/ |
|
struct svc_export * |
|
rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
|
{ |
|
struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
|
struct cache_detail *cd = nn->svc_export_cache; |
|
|
|
if (rqstp->rq_client == NULL) |
|
goto gss; |
|
|
|
/* First try the auth_unix client: */ |
|
exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle); |
|
if (PTR_ERR(exp) == -ENOENT) |
|
goto gss; |
|
if (IS_ERR(exp)) |
|
return exp; |
|
/* If it has secinfo, assume there are no gss/... clients */ |
|
if (exp->ex_nflavors > 0) |
|
return exp; |
|
gss: |
|
/* Otherwise, try falling back on gss client */ |
|
if (rqstp->rq_gssclient == NULL) |
|
return exp; |
|
gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
|
if (PTR_ERR(gssexp) == -ENOENT) |
|
return exp; |
|
if (!IS_ERR(exp)) |
|
exp_put(exp); |
|
return gssexp; |
|
} |
|
|
|
struct svc_export * |
|
rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) |
|
{ |
|
struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
|
struct cache_detail *cd = nn->svc_export_cache; |
|
|
|
if (rqstp->rq_client == NULL) |
|
goto gss; |
|
|
|
/* First try the auth_unix client: */ |
|
exp = exp_find(cd, rqstp->rq_client, fsid_type, |
|
fsidv, &rqstp->rq_chandle); |
|
if (PTR_ERR(exp) == -ENOENT) |
|
goto gss; |
|
if (IS_ERR(exp)) |
|
return exp; |
|
/* If it has secinfo, assume there are no gss/... clients */ |
|
if (exp->ex_nflavors > 0) |
|
return exp; |
|
gss: |
|
/* Otherwise, try falling back on gss client */ |
|
if (rqstp->rq_gssclient == NULL) |
|
return exp; |
|
gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv, |
|
&rqstp->rq_chandle); |
|
if (PTR_ERR(gssexp) == -ENOENT) |
|
return exp; |
|
if (!IS_ERR(exp)) |
|
exp_put(exp); |
|
return gssexp; |
|
} |
|
|
|
struct svc_export * |
|
rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
|
{ |
|
struct dentry *saved = dget(path->dentry); |
|
struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); |
|
|
|
while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
|
struct dentry *parent = dget_parent(path->dentry); |
|
dput(path->dentry); |
|
path->dentry = parent; |
|
exp = rqst_exp_get_by_name(rqstp, path); |
|
} |
|
dput(path->dentry); |
|
path->dentry = saved; |
|
return exp; |
|
} |
|
|
|
struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
|
{ |
|
u32 fsidv[2]; |
|
|
|
mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); |
|
|
|
return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
|
} |
|
|
|
/* |
|
* Called when we need the filehandle for the root of the pseudofs, |
|
* for a given NFSv4 client. The root is defined to be the |
|
* export point with fsid==0 |
|
*/ |
|
__be32 |
|
exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
|
{ |
|
struct svc_export *exp; |
|
__be32 rv; |
|
|
|
exp = rqst_find_fsidzero_export(rqstp); |
|
if (IS_ERR(exp)) |
|
return nfserrno(PTR_ERR(exp)); |
|
rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
|
exp_put(exp); |
|
return rv; |
|
} |
|
|
|
static struct flags { |
|
int flag; |
|
char *name[2]; |
|
} expflags[] = { |
|
{ NFSEXP_READONLY, {"ro", "rw"}}, |
|
{ NFSEXP_INSECURE_PORT, {"insecure", ""}}, |
|
{ NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, |
|
{ NFSEXP_ALLSQUASH, {"all_squash", ""}}, |
|
{ NFSEXP_ASYNC, {"async", "sync"}}, |
|
{ NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, |
|
{ NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}}, |
|
{ NFSEXP_NOHIDE, {"nohide", ""}}, |
|
{ NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, |
|
{ NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, |
|
{ NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, |
|
{ NFSEXP_V4ROOT, {"v4root", ""}}, |
|
{ NFSEXP_PNFS, {"pnfs", ""}}, |
|
{ NFSEXP_SECURITY_LABEL, {"security_label", ""}}, |
|
{ 0, {"", ""}} |
|
}; |
|
|
|
static void show_expflags(struct seq_file *m, int flags, int mask) |
|
{ |
|
struct flags *flg; |
|
int state, first = 0; |
|
|
|
for (flg = expflags; flg->flag; flg++) { |
|
if (flg->flag & ~mask) |
|
continue; |
|
state = (flg->flag & flags) ? 0 : 1; |
|
if (*flg->name[state]) |
|
seq_printf(m, "%s%s", first++?",":"", flg->name[state]); |
|
} |
|
} |
|
|
|
static void show_secinfo_flags(struct seq_file *m, int flags) |
|
{ |
|
seq_printf(m, ","); |
|
show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); |
|
} |
|
|
|
static bool secinfo_flags_equal(int f, int g) |
|
{ |
|
f &= NFSEXP_SECINFO_FLAGS; |
|
g &= NFSEXP_SECINFO_FLAGS; |
|
return f == g; |
|
} |
|
|
|
static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) |
|
{ |
|
int flags; |
|
|
|
flags = (*fp)->flags; |
|
seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); |
|
(*fp)++; |
|
while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { |
|
seq_printf(m, ":%d", (*fp)->pseudoflavor); |
|
(*fp)++; |
|
} |
|
return flags; |
|
} |
|
|
|
static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
|
{ |
|
struct exp_flavor_info *f; |
|
struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; |
|
int flags; |
|
|
|
if (exp->ex_nflavors == 0) |
|
return; |
|
f = exp->ex_flavors; |
|
flags = show_secinfo_run(m, &f, end); |
|
if (!secinfo_flags_equal(flags, exp->ex_flags)) |
|
show_secinfo_flags(m, flags); |
|
while (f != end) { |
|
flags = show_secinfo_run(m, &f, end); |
|
show_secinfo_flags(m, flags); |
|
} |
|
} |
|
|
|
static void exp_flags(struct seq_file *m, int flag, int fsid, |
|
kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc) |
|
{ |
|
struct user_namespace *userns = m->file->f_cred->user_ns; |
|
|
|
show_expflags(m, flag, NFSEXP_ALLFLAGS); |
|
if (flag & NFSEXP_FSID) |
|
seq_printf(m, ",fsid=%d", fsid); |
|
if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) && |
|
!uid_eq(anonu, make_kuid(userns, 0x10000-2))) |
|
seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu)); |
|
if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) && |
|
!gid_eq(anong, make_kgid(userns, 0x10000-2))) |
|
seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong)); |
|
if (fsloc && fsloc->locations_count > 0) { |
|
char *loctype = (fsloc->migrated) ? "refer" : "replicas"; |
|
int i; |
|
|
|
seq_printf(m, ",%s=", loctype); |
|
seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
|
seq_putc(m, '@'); |
|
seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); |
|
for (i = 1; i < fsloc->locations_count; i++) { |
|
seq_putc(m, ';'); |
|
seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); |
|
seq_putc(m, '@'); |
|
seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); |
|
} |
|
} |
|
} |
|
|
|
static int e_show(struct seq_file *m, void *p) |
|
{ |
|
struct cache_head *cp = p; |
|
struct svc_export *exp = container_of(cp, struct svc_export, h); |
|
struct cache_detail *cd = m->private; |
|
bool export_stats = is_export_stats_file(m); |
|
|
|
if (p == SEQ_START_TOKEN) { |
|
seq_puts(m, "# Version 1.1\n"); |
|
if (export_stats) |
|
seq_puts(m, "# Path Client Start-time\n#\tStats\n"); |
|
else |
|
seq_puts(m, "# Path Client(Flags) # IPs\n"); |
|
return 0; |
|
} |
|
|
|
exp_get(exp); |
|
if (cache_check(cd, &exp->h, NULL)) |
|
return 0; |
|
exp_put(exp); |
|
return svc_export_show(m, cd, cp); |
|
} |
|
|
|
const struct seq_operations nfs_exports_op = { |
|
.start = cache_seq_start_rcu, |
|
.next = cache_seq_next_rcu, |
|
.stop = cache_seq_stop_rcu, |
|
.show = e_show, |
|
}; |
|
|
|
/* |
|
* Initialize the exports module. |
|
*/ |
|
int |
|
nfsd_export_init(struct net *net) |
|
{ |
|
int rv; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum); |
|
|
|
nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net); |
|
if (IS_ERR(nn->svc_export_cache)) |
|
return PTR_ERR(nn->svc_export_cache); |
|
rv = cache_register_net(nn->svc_export_cache, net); |
|
if (rv) |
|
goto destroy_export_cache; |
|
|
|
nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net); |
|
if (IS_ERR(nn->svc_expkey_cache)) { |
|
rv = PTR_ERR(nn->svc_expkey_cache); |
|
goto unregister_export_cache; |
|
} |
|
rv = cache_register_net(nn->svc_expkey_cache, net); |
|
if (rv) |
|
goto destroy_expkey_cache; |
|
return 0; |
|
|
|
destroy_expkey_cache: |
|
cache_destroy_net(nn->svc_expkey_cache, net); |
|
unregister_export_cache: |
|
cache_unregister_net(nn->svc_export_cache, net); |
|
destroy_export_cache: |
|
cache_destroy_net(nn->svc_export_cache, net); |
|
return rv; |
|
} |
|
|
|
/* |
|
* Flush exports table - called when last nfsd thread is killed |
|
*/ |
|
void |
|
nfsd_export_flush(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
cache_purge(nn->svc_expkey_cache); |
|
cache_purge(nn->svc_export_cache); |
|
} |
|
|
|
/* |
|
* Shutdown the exports module. |
|
*/ |
|
void |
|
nfsd_export_shutdown(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum); |
|
|
|
cache_unregister_net(nn->svc_expkey_cache, net); |
|
cache_unregister_net(nn->svc_export_cache, net); |
|
cache_destroy_net(nn->svc_expkey_cache, net); |
|
cache_destroy_net(nn->svc_export_cache, net); |
|
svcauth_unix_purge(net); |
|
|
|
dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum); |
|
}
|
|
|