![Julia Lawall](/assets/img/avatar_default.png)
Once clp is assigned, it never becomes NULL, so we can make a label for it in the error handling code. Because the call to path_lookup follows the call to auth_domain_find, its error handling code should jump to this new label. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r@ expression x,E; statement S; position p1,p2,p3; @@ ( if ((x = auth_domain_find@p1(...)) == NULL || ...) S | x = auth_domain_find@p1(...) ... when != x if (x == NULL || ...) S ) <... if@p3 (...) { ... when != auth_domain_put(x) when != if (x) { ... auth_domain_put(x); ...} return@p2 ...; } ...> ( return x; | return 0; | x = E | E = x | auth_domain_put(x) ) @exists@ position r.p1,r.p2,r.p3; expression x; int ret != 0; statement S; @@ * x = auth_domain_find@p1(...) <... * if@p3 (...) S ...> * return@p2 \(NULL\|ret\); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
1681 lines
39 KiB
C
1681 lines
39 KiB
C
#define MSNFS /* HACK HACK */
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/*
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* linux/fs/nfsd/export.c
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*
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* NFS exporting and validation.
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*
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* We maintain a list of clients, each of which has a list of
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* exports. To export an fs to a given client, you first have
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* to create the client entry with NFSCTL_ADDCLIENT, which
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* creates a client control block and adds it to the hash
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* table. Then, you call NFSCTL_EXPORT for each fs.
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*
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*
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* Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
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*/
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/in.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/rwsem.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/hash.h>
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#include <linux/module.h>
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#include <linux/exportfs.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfsd/nfsfh.h>
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#include <linux/nfsd/syscall.h>
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#include <linux/lockd/bind.h>
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/sunrpc/gss_api.h>
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#include <net/ipv6.h>
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#define NFSDDBG_FACILITY NFSDDBG_EXPORT
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typedef struct auth_domain svc_client;
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typedef struct svc_export svc_export;
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static void exp_do_unexport(svc_export *unexp);
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static int exp_verify_string(char *cp, int max);
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/*
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* We have two caches.
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* One maps client+vfsmnt+dentry to export options - the export map
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* The other maps client+filehandle-fragment to export options. - the expkey map
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*
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* 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.
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*/
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#define EXPKEY_HASHBITS 8
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#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
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#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
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static struct cache_head *expkey_table[EXPKEY_HASHMAX];
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static void expkey_put(struct kref *ref)
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{
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struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
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if (test_bit(CACHE_VALID, &key->h.flags) &&
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!test_bit(CACHE_NEGATIVE, &key->h.flags))
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path_put(&key->ek_path);
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auth_domain_put(key->ek_client);
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kfree(key);
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}
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static void expkey_request(struct cache_detail *cd,
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struct cache_head *h,
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char **bpp, int *blen)
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{
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/* client fsidtype \xfsid */
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struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
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char type[5];
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qword_add(bpp, blen, ek->ek_client->name);
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snprintf(type, 5, "%d", ek->ek_fsidtype);
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qword_add(bpp, blen, type);
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qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
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(*bpp)[-1] = '\n';
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}
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static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
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static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
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static struct cache_detail svc_expkey_cache;
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static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
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{
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/* client fsidtype fsid [path] */
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char *buf;
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int len;
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struct auth_domain *dom = NULL;
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int err;
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int fsidtype;
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char *ep;
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struct svc_expkey key;
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struct svc_expkey *ek;
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if (mesg[mlen-1] != '\n')
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return -EINVAL;
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mesg[mlen-1] = 0;
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buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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err = -ENOMEM;
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if (!buf) goto out;
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err = -EINVAL;
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if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
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goto out;
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err = -ENOENT;
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dom = auth_domain_find(buf);
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if (!dom)
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goto out;
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dprintk("found domain %s\n", buf);
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err = -EINVAL;
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if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
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goto out;
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fsidtype = simple_strtoul(buf, &ep, 10);
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if (*ep)
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goto out;
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dprintk("found fsidtype %d\n", fsidtype);
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if (key_len(fsidtype)==0) /* invalid type */
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goto out;
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if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
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goto out;
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dprintk("found fsid length %d\n", len);
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if (len != key_len(fsidtype))
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goto out;
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/* OK, we seem to have a valid key */
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key.h.flags = 0;
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key.h.expiry_time = get_expiry(&mesg);
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if (key.h.expiry_time == 0)
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goto out;
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key.ek_client = dom;
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key.ek_fsidtype = fsidtype;
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memcpy(key.ek_fsid, buf, len);
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ek = svc_expkey_lookup(&key);
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err = -ENOMEM;
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if (!ek)
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goto out;
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/* now we want a pathname, or empty meaning NEGATIVE */
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err = -EINVAL;
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if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
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goto out;
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dprintk("Path seems to be <%s>\n", buf);
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err = 0;
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if (len == 0) {
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set_bit(CACHE_NEGATIVE, &key.h.flags);
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ek = svc_expkey_update(&key, ek);
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if (ek)
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cache_put(&ek->h, &svc_expkey_cache);
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else err = -ENOMEM;
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} else {
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struct nameidata nd;
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err = path_lookup(buf, 0, &nd);
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if (err)
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goto out;
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dprintk("Found the path %s\n", buf);
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key.ek_path = nd.path;
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ek = svc_expkey_update(&key, ek);
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if (ek)
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cache_put(&ek->h, &svc_expkey_cache);
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else
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err = -ENOMEM;
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path_put(&nd.path);
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}
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cache_flush();
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out:
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if (dom)
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auth_domain_put(dom);
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kfree(buf);
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return err;
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}
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static int expkey_show(struct seq_file *m,
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struct cache_detail *cd,
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struct cache_head *h)
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{
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struct svc_expkey *ek ;
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int i;
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if (h ==NULL) {
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seq_puts(m, "#domain fsidtype fsid [path]\n");
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return 0;
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}
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ek = container_of(h, struct svc_expkey, h);
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seq_printf(m, "%s %d 0x", ek->ek_client->name,
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ek->ek_fsidtype);
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for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
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seq_printf(m, "%08x", ek->ek_fsid[i]);
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if (test_bit(CACHE_VALID, &h->flags) &&
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!test_bit(CACHE_NEGATIVE, &h->flags)) {
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seq_printf(m, " ");
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seq_path(m, &ek->ek_path, "\\ \t\n");
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}
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seq_printf(m, "\n");
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return 0;
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}
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static inline int expkey_match (struct cache_head *a, struct cache_head *b)
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{
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struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
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struct svc_expkey *new = container_of(b, struct svc_expkey, h);
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if (orig->ek_fsidtype != new->ek_fsidtype ||
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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;
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return 1;
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}
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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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{
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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);
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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;
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memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
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}
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static inline void expkey_update(struct cache_head *cnew,
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struct cache_head *citem)
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{
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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);
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new->ek_path = item->ek_path;
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path_get(&item->ek_path);
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}
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static struct cache_head *expkey_alloc(void)
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{
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struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
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if (i)
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return &i->h;
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else
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return NULL;
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}
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static struct cache_detail svc_expkey_cache = {
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.owner = THIS_MODULE,
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.hash_size = EXPKEY_HASHMAX,
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.hash_table = expkey_table,
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.name = "nfsd.fh",
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.cache_put = expkey_put,
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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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};
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static struct svc_expkey *
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svc_expkey_lookup(struct svc_expkey *item)
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{
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struct cache_head *ch;
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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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ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
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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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static struct svc_expkey *
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svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
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{
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struct cache_head *ch;
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int hash = new->ek_fsidtype;
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char * cp = (char*)new->ek_fsid;
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int len = key_len(new->ek_fsidtype);
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hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
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hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
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hash &= EXPKEY_HASHMASK;
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ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
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&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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#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
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static struct cache_head *export_table[EXPORT_HASHMAX];
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static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
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{
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int i;
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for (i = 0; i < fsloc->locations_count; i++) {
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kfree(fsloc->locations[i].path);
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kfree(fsloc->locations[i].hosts);
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}
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kfree(fsloc->locations);
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}
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static void svc_export_put(struct kref *ref)
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{
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struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
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path_put(&exp->ex_path);
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auth_domain_put(exp->ex_client);
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kfree(exp->ex_pathname);
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nfsd4_fslocs_free(&exp->ex_fslocs);
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kfree(exp);
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}
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static void svc_export_request(struct cache_detail *cd,
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struct cache_head *h,
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char **bpp, int *blen)
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{
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/* client path */
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struct svc_export *exp = container_of(h, struct svc_export, h);
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char *pth;
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qword_add(bpp, blen, exp->ex_client->name);
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pth = d_path(&exp->ex_path, *bpp, *blen);
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if (IS_ERR(pth)) {
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/* is this correct? */
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(*bpp)[0] = '\n';
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return;
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}
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qword_add(bpp, blen, pth);
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(*bpp)[-1] = '\n';
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}
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static struct svc_export *svc_export_update(struct svc_export *new,
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struct svc_export *old);
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static struct svc_export *svc_export_lookup(struct svc_export *);
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|
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static int check_export(struct inode *inode, int flags, unsigned char *uuid)
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{
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/* We currently export only dirs and regular files.
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* This is what umountd does.
|
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*/
|
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if (!S_ISDIR(inode->i_mode) &&
|
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!S_ISREG(inode->i_mode))
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return -ENOTDIR;
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|
|
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/* There are two requirements on a filesystem to be exportable.
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* 1: We must be able to identify the filesystem from a number.
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* either a device number (so FS_REQUIRES_DEV needed)
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* or an FSID number (so NFSEXP_FSID or ->uuid is needed).
|
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* 2: We must be able to find an inode from a filehandle.
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* This means that s_export_op must be set.
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*/
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if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
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!(flags & NFSEXP_FSID) &&
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uuid == NULL) {
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dprintk("exp_export: export of non-dev fs without fsid\n");
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return -EINVAL;
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}
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|
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if (!inode->i_sb->s_export_op ||
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!inode->i_sb->s_export_op->fh_to_dentry) {
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dprintk("exp_export: export of invalid fs type.\n");
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return -EINVAL;
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}
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return 0;
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|
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}
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|
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#ifdef CONFIG_NFSD_V4
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static int
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fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
|
|
{
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int len;
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int migrated, i, err;
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|
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/* listsize */
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|
err = get_int(mesg, &fsloc->locations_count);
|
|
if (err)
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return err;
|
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if (fsloc->locations_count > MAX_FS_LOCATIONS)
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return -EINVAL;
|
|
if (fsloc->locations_count == 0)
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return 0;
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|
|
fsloc->locations = kzalloc(fsloc->locations_count
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* sizeof(struct nfsd4_fs_location), GFP_KERNEL);
|
|
if (!fsloc->locations)
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return -ENOMEM;
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|
for (i=0; i < fsloc->locations_count; i++) {
|
|
/* colon separated host list */
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|
err = -EINVAL;
|
|
len = qword_get(mesg, buf, PAGE_SIZE);
|
|
if (len <= 0)
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|
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)
|
|
{
|
|
int listsize, err;
|
|
struct exp_flavor_info *f;
|
|
|
|
err = get_int(mesg, &listsize);
|
|
if (err)
|
|
return err;
|
|
if (listsize < 0 || listsize > MAX_SECINFO_LIST)
|
|
return -EINVAL;
|
|
|
|
for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
|
|
err = get_int(mesg, &f->pseudoflavor);
|
|
if (err)
|
|
return err;
|
|
/*
|
|
* Just a quick sanity check; we could also try to check
|
|
* whether this pseudoflavor is supported, but at worst
|
|
* an unsupported pseudoflavor on the export would just
|
|
* be a pseudoflavor that won't match the flavor of any
|
|
* authenticated request. The administrator will
|
|
* probably discover the problem when someone fails to
|
|
* authenticate.
|
|
*/
|
|
if (f->pseudoflavor < 0)
|
|
return -EINVAL;
|
|
err = get_int(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 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 nameidata nd;
|
|
struct svc_export exp, *expp;
|
|
int an_int;
|
|
|
|
nd.path.dentry = NULL;
|
|
exp.ex_pathname = NULL;
|
|
|
|
/* fs locations */
|
|
exp.ex_fslocs.locations = NULL;
|
|
exp.ex_fslocs.locations_count = 0;
|
|
exp.ex_fslocs.migrated = 0;
|
|
|
|
exp.ex_uuid = NULL;
|
|
|
|
/* secinfo */
|
|
exp.ex_nflavors = 0;
|
|
|
|
if (mesg[mlen-1] != '\n')
|
|
return -EINVAL;
|
|
mesg[mlen-1] = 0;
|
|
|
|
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!buf) goto out;
|
|
|
|
/* client */
|
|
len = qword_get(&mesg, buf, PAGE_SIZE);
|
|
err = -EINVAL;
|
|
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 out;
|
|
err = path_lookup(buf, 0, &nd);
|
|
if (err) goto out_no_path;
|
|
|
|
exp.h.flags = 0;
|
|
exp.ex_client = dom;
|
|
exp.ex_path.mnt = nd.path.mnt;
|
|
exp.ex_path.dentry = nd.path.dentry;
|
|
exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!exp.ex_pathname)
|
|
goto out;
|
|
|
|
/* expiry */
|
|
err = -EINVAL;
|
|
exp.h.expiry_time = get_expiry(&mesg);
|
|
if (exp.h.expiry_time == 0)
|
|
goto out;
|
|
|
|
/* 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 out;
|
|
exp.ex_flags= an_int;
|
|
|
|
/* anon uid */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err) goto out;
|
|
exp.ex_anon_uid= an_int;
|
|
|
|
/* anon gid */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err) goto out;
|
|
exp.ex_anon_gid= an_int;
|
|
|
|
/* fsid */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err) goto out;
|
|
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) {
|
|
/* expect a 16 byte uuid encoded as \xXXXX... */
|
|
len = qword_get(&mesg, buf, PAGE_SIZE);
|
|
if (len != 16)
|
|
err = -EINVAL;
|
|
else {
|
|
exp.ex_uuid =
|
|
kmemdup(buf, 16, GFP_KERNEL);
|
|
if (exp.ex_uuid == NULL)
|
|
err = -ENOMEM;
|
|
}
|
|
} 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 out;
|
|
}
|
|
|
|
err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
|
|
exp.ex_uuid);
|
|
if (err) goto out;
|
|
}
|
|
|
|
expp = svc_export_lookup(&exp);
|
|
if (expp)
|
|
expp = svc_export_update(&exp, expp);
|
|
else
|
|
err = -ENOMEM;
|
|
cache_flush();
|
|
if (expp == NULL)
|
|
err = -ENOMEM;
|
|
else
|
|
exp_put(expp);
|
|
out:
|
|
nfsd4_fslocs_free(&exp.ex_fslocs);
|
|
kfree(exp.ex_uuid);
|
|
kfree(exp.ex_pathname);
|
|
if (nd.path.dentry)
|
|
path_put(&nd.path);
|
|
out_no_path:
|
|
if (dom)
|
|
auth_domain_put(dom);
|
|
kfree(buf);
|
|
return err;
|
|
}
|
|
|
|
static void exp_flags(struct seq_file *m, int flag, int fsid,
|
|
uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
|
|
static void show_secinfo(struct seq_file *m, struct svc_export *exp);
|
|
|
|
static int svc_export_show(struct seq_file *m,
|
|
struct cache_detail *cd,
|
|
struct cache_head *h)
|
|
{
|
|
struct svc_export *exp ;
|
|
|
|
if (h ==NULL) {
|
|
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\\");
|
|
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<16; 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 &&
|
|
orig->ex_path.dentry == new->ex_path.dentry &&
|
|
orig->ex_path.mnt == new->ex_path.mnt;
|
|
}
|
|
|
|
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.dentry = dget(item->ex_path.dentry);
|
|
new->ex_path.mnt = mntget(item->ex_path.mnt);
|
|
new->ex_pathname = NULL;
|
|
new->ex_fslocs.locations = NULL;
|
|
new->ex_fslocs.locations_count = 0;
|
|
new->ex_fslocs.migrated = 0;
|
|
}
|
|
|
|
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_uuid = item->ex_uuid;
|
|
item->ex_uuid = NULL;
|
|
new->ex_pathname = item->ex_pathname;
|
|
item->ex_pathname = 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_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 &i->h;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
struct cache_detail svc_export_cache = {
|
|
.owner = THIS_MODULE,
|
|
.hash_size = EXPORT_HASHMAX,
|
|
.hash_table = export_table,
|
|
.name = "nfsd.export",
|
|
.cache_put = svc_export_put,
|
|
.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 struct svc_export *
|
|
svc_export_lookup(struct svc_export *exp)
|
|
{
|
|
struct cache_head *ch;
|
|
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);
|
|
|
|
ch = sunrpc_cache_lookup(&svc_export_cache, &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;
|
|
hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
|
|
hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
|
|
hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
|
|
|
|
ch = sunrpc_cache_update(&svc_export_cache, &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(svc_client *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(&key);
|
|
if (ek == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
err = cache_check(&svc_expkey_cache, &ek->h, reqp);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return ek;
|
|
}
|
|
|
|
static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
|
|
struct svc_export *exp)
|
|
{
|
|
struct svc_expkey key, *ek;
|
|
|
|
key.ek_client = clp;
|
|
key.ek_fsidtype = fsid_type;
|
|
memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
|
|
key.ek_path = exp->ex_path;
|
|
key.h.expiry_time = NEVER;
|
|
key.h.flags = 0;
|
|
|
|
ek = svc_expkey_lookup(&key);
|
|
if (ek)
|
|
ek = svc_expkey_update(&key,ek);
|
|
if (ek) {
|
|
cache_put(&ek->h, &svc_expkey_cache);
|
|
return 0;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Find the client's export entry matching xdev/xino.
|
|
*/
|
|
static inline struct svc_expkey *
|
|
exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
|
|
{
|
|
u32 fsidv[3];
|
|
|
|
if (old_valid_dev(dev)) {
|
|
mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
|
|
return exp_find_key(clp, FSID_DEV, fsidv, NULL);
|
|
}
|
|
mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
|
|
return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
|
|
}
|
|
|
|
/*
|
|
* Find the client's export entry matching fsid
|
|
*/
|
|
static inline struct svc_expkey *
|
|
exp_get_fsid_key(svc_client *clp, int fsid)
|
|
{
|
|
u32 fsidv[2];
|
|
|
|
mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
|
|
|
|
return exp_find_key(clp, FSID_NUM, fsidv, NULL);
|
|
}
|
|
|
|
static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
|
|
struct dentry *dentry,
|
|
struct cache_req *reqp)
|
|
{
|
|
struct svc_export *exp, key;
|
|
int err;
|
|
|
|
if (!clp)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
key.ex_client = clp;
|
|
key.ex_path.mnt = mnt;
|
|
key.ex_path.dentry = dentry;
|
|
|
|
exp = svc_export_lookup(&key);
|
|
if (exp == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
err = cache_check(&svc_export_cache, &exp->h, reqp);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return exp;
|
|
}
|
|
|
|
/*
|
|
* Find the export entry for a given dentry.
|
|
*/
|
|
static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
|
|
struct dentry *dentry,
|
|
struct cache_req *reqp)
|
|
{
|
|
svc_export *exp;
|
|
|
|
dget(dentry);
|
|
exp = exp_get_by_name(clp, mnt, dentry, reqp);
|
|
|
|
while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
|
|
struct dentry *parent;
|
|
|
|
parent = dget_parent(dentry);
|
|
dput(dentry);
|
|
dentry = parent;
|
|
exp = exp_get_by_name(clp, mnt, dentry, reqp);
|
|
}
|
|
dput(dentry);
|
|
return exp;
|
|
}
|
|
|
|
/*
|
|
* Hashtable locking. Write locks are placed only by user processes
|
|
* wanting to modify export information.
|
|
* Write locking only done in this file. Read locking
|
|
* needed externally.
|
|
*/
|
|
|
|
static DECLARE_RWSEM(hash_sem);
|
|
|
|
void
|
|
exp_readlock(void)
|
|
{
|
|
down_read(&hash_sem);
|
|
}
|
|
|
|
static inline void
|
|
exp_writelock(void)
|
|
{
|
|
down_write(&hash_sem);
|
|
}
|
|
|
|
void
|
|
exp_readunlock(void)
|
|
{
|
|
up_read(&hash_sem);
|
|
}
|
|
|
|
static inline void
|
|
exp_writeunlock(void)
|
|
{
|
|
up_write(&hash_sem);
|
|
}
|
|
|
|
static void exp_fsid_unhash(struct svc_export *exp)
|
|
{
|
|
struct svc_expkey *ek;
|
|
|
|
if ((exp->ex_flags & NFSEXP_FSID) == 0)
|
|
return;
|
|
|
|
ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
|
|
if (!IS_ERR(ek)) {
|
|
ek->h.expiry_time = get_seconds()-1;
|
|
cache_put(&ek->h, &svc_expkey_cache);
|
|
}
|
|
svc_expkey_cache.nextcheck = get_seconds();
|
|
}
|
|
|
|
static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
|
|
{
|
|
u32 fsid[2];
|
|
|
|
if ((exp->ex_flags & NFSEXP_FSID) == 0)
|
|
return 0;
|
|
|
|
mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
|
|
return exp_set_key(clp, FSID_NUM, fsid, exp);
|
|
}
|
|
|
|
static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
|
|
{
|
|
u32 fsid[2];
|
|
struct inode *inode = exp->ex_path.dentry->d_inode;
|
|
dev_t dev = inode->i_sb->s_dev;
|
|
|
|
if (old_valid_dev(dev)) {
|
|
mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
|
|
return exp_set_key(clp, FSID_DEV, fsid, exp);
|
|
}
|
|
mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
|
|
return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
|
|
}
|
|
|
|
static void exp_unhash(struct svc_export *exp)
|
|
{
|
|
struct svc_expkey *ek;
|
|
struct inode *inode = exp->ex_path.dentry->d_inode;
|
|
|
|
ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
|
|
if (!IS_ERR(ek)) {
|
|
ek->h.expiry_time = get_seconds()-1;
|
|
cache_put(&ek->h, &svc_expkey_cache);
|
|
}
|
|
svc_expkey_cache.nextcheck = get_seconds();
|
|
}
|
|
|
|
/*
|
|
* Export a file system.
|
|
*/
|
|
int
|
|
exp_export(struct nfsctl_export *nxp)
|
|
{
|
|
svc_client *clp;
|
|
struct svc_export *exp = NULL;
|
|
struct svc_export new;
|
|
struct svc_expkey *fsid_key = NULL;
|
|
struct nameidata nd;
|
|
int err;
|
|
|
|
/* Consistency check */
|
|
err = -EINVAL;
|
|
if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
|
|
!exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
|
|
goto out;
|
|
|
|
dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
|
|
nxp->ex_client, nxp->ex_path,
|
|
(unsigned)nxp->ex_dev, (long)nxp->ex_ino,
|
|
nxp->ex_flags);
|
|
|
|
/* Try to lock the export table for update */
|
|
exp_writelock();
|
|
|
|
/* Look up client info */
|
|
if (!(clp = auth_domain_find(nxp->ex_client)))
|
|
goto out_unlock;
|
|
|
|
|
|
/* Look up the dentry */
|
|
err = path_lookup(nxp->ex_path, 0, &nd);
|
|
if (err)
|
|
goto out_put_clp;
|
|
err = -EINVAL;
|
|
|
|
exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
|
|
|
|
memset(&new, 0, sizeof(new));
|
|
|
|
/* must make sure there won't be an ex_fsid clash */
|
|
if ((nxp->ex_flags & NFSEXP_FSID) &&
|
|
(!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
|
|
fsid_key->ek_path.mnt &&
|
|
(fsid_key->ek_path.mnt != nd.path.mnt ||
|
|
fsid_key->ek_path.dentry != nd.path.dentry))
|
|
goto finish;
|
|
|
|
if (!IS_ERR(exp)) {
|
|
/* just a flags/id/fsid update */
|
|
|
|
exp_fsid_unhash(exp);
|
|
exp->ex_flags = nxp->ex_flags;
|
|
exp->ex_anon_uid = nxp->ex_anon_uid;
|
|
exp->ex_anon_gid = nxp->ex_anon_gid;
|
|
exp->ex_fsid = nxp->ex_dev;
|
|
|
|
err = exp_fsid_hash(clp, exp);
|
|
goto finish;
|
|
}
|
|
|
|
err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
|
|
if (err) goto finish;
|
|
|
|
err = -ENOMEM;
|
|
|
|
dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
|
|
|
|
new.h.expiry_time = NEVER;
|
|
new.h.flags = 0;
|
|
new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
|
|
if (!new.ex_pathname)
|
|
goto finish;
|
|
new.ex_client = clp;
|
|
new.ex_path = nd.path;
|
|
new.ex_flags = nxp->ex_flags;
|
|
new.ex_anon_uid = nxp->ex_anon_uid;
|
|
new.ex_anon_gid = nxp->ex_anon_gid;
|
|
new.ex_fsid = nxp->ex_dev;
|
|
|
|
exp = svc_export_lookup(&new);
|
|
if (exp)
|
|
exp = svc_export_update(&new, exp);
|
|
|
|
if (!exp)
|
|
goto finish;
|
|
|
|
if (exp_hash(clp, exp) ||
|
|
exp_fsid_hash(clp, exp)) {
|
|
/* failed to create at least one index */
|
|
exp_do_unexport(exp);
|
|
cache_flush();
|
|
} else
|
|
err = 0;
|
|
finish:
|
|
kfree(new.ex_pathname);
|
|
if (exp)
|
|
exp_put(exp);
|
|
if (fsid_key && !IS_ERR(fsid_key))
|
|
cache_put(&fsid_key->h, &svc_expkey_cache);
|
|
path_put(&nd.path);
|
|
out_put_clp:
|
|
auth_domain_put(clp);
|
|
out_unlock:
|
|
exp_writeunlock();
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Unexport a file system. The export entry has already
|
|
* been removed from the client's list of exported fs's.
|
|
*/
|
|
static void
|
|
exp_do_unexport(svc_export *unexp)
|
|
{
|
|
unexp->h.expiry_time = get_seconds()-1;
|
|
svc_export_cache.nextcheck = get_seconds();
|
|
exp_unhash(unexp);
|
|
exp_fsid_unhash(unexp);
|
|
}
|
|
|
|
|
|
/*
|
|
* unexport syscall.
|
|
*/
|
|
int
|
|
exp_unexport(struct nfsctl_export *nxp)
|
|
{
|
|
struct auth_domain *dom;
|
|
svc_export *exp;
|
|
struct nameidata nd;
|
|
int err;
|
|
|
|
/* Consistency check */
|
|
if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
|
|
!exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
|
|
return -EINVAL;
|
|
|
|
exp_writelock();
|
|
|
|
err = -EINVAL;
|
|
dom = auth_domain_find(nxp->ex_client);
|
|
if (!dom) {
|
|
dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
|
|
goto out_unlock;
|
|
}
|
|
|
|
err = path_lookup(nxp->ex_path, 0, &nd);
|
|
if (err)
|
|
goto out_domain;
|
|
|
|
err = -EINVAL;
|
|
exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
|
|
path_put(&nd.path);
|
|
if (IS_ERR(exp))
|
|
goto out_domain;
|
|
|
|
exp_do_unexport(exp);
|
|
exp_put(exp);
|
|
err = 0;
|
|
|
|
out_domain:
|
|
auth_domain_put(dom);
|
|
cache_flush();
|
|
out_unlock:
|
|
exp_writeunlock();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 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(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
|
|
{
|
|
struct svc_export *exp;
|
|
struct nameidata nd;
|
|
struct inode *inode;
|
|
struct svc_fh fh;
|
|
int err;
|
|
|
|
err = -EPERM;
|
|
/* NB: we probably ought to check that it's NUL-terminated */
|
|
if (path_lookup(path, 0, &nd)) {
|
|
printk("nfsd: exp_rootfh path not found %s", path);
|
|
return err;
|
|
}
|
|
inode = nd.path.dentry->d_inode;
|
|
|
|
dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
|
|
path, nd.path.dentry, clp->name,
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
|
|
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, nd.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(&nd.path);
|
|
return err;
|
|
}
|
|
|
|
static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
|
|
u32 *fsidv, struct cache_req *reqp)
|
|
{
|
|
struct svc_export *exp;
|
|
struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
|
|
if (IS_ERR(ek))
|
|
return ERR_CAST(ek);
|
|
|
|
exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
|
|
cache_put(&ek->h, &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_flavor)
|
|
return 0;
|
|
}
|
|
/* defaults in absence of sec= options: */
|
|
if (exp->ex_nflavors == 0) {
|
|
if (rqstp->rq_flavor == RPC_AUTH_NULL ||
|
|
rqstp->rq_flavor == RPC_AUTH_UNIX)
|
|
return 0;
|
|
}
|
|
return 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 vfsmount *mnt,
|
|
struct dentry *dentry)
|
|
{
|
|
struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
|
|
|
|
if (rqstp->rq_client == NULL)
|
|
goto gss;
|
|
|
|
/* First try the auth_unix client: */
|
|
exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
|
|
&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(rqstp->rq_gssclient, mnt, dentry,
|
|
&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);
|
|
|
|
if (rqstp->rq_client == NULL)
|
|
goto gss;
|
|
|
|
/* First try the auth_unix client: */
|
|
exp = exp_find(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(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 vfsmount *mnt,
|
|
struct dentry *dentry)
|
|
{
|
|
struct svc_export *exp;
|
|
|
|
dget(dentry);
|
|
exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
|
|
|
|
while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
|
|
struct dentry *parent;
|
|
|
|
parent = dget_parent(dentry);
|
|
dput(dentry);
|
|
dentry = parent;
|
|
exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
|
|
}
|
|
dput(dentry);
|
|
return exp;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
u32 fsidv[2];
|
|
|
|
mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
|
|
|
|
exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
|
|
if (IS_ERR(exp))
|
|
return nfserrno(PTR_ERR(exp));
|
|
rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
|
|
if (rv)
|
|
goto out;
|
|
rv = check_nfsd_access(exp, rqstp);
|
|
out:
|
|
exp_put(exp);
|
|
return rv;
|
|
}
|
|
|
|
/* Iterator */
|
|
|
|
static void *e_start(struct seq_file *m, loff_t *pos)
|
|
__acquires(svc_export_cache.hash_lock)
|
|
{
|
|
loff_t n = *pos;
|
|
unsigned hash, export;
|
|
struct cache_head *ch;
|
|
|
|
exp_readlock();
|
|
read_lock(&svc_export_cache.hash_lock);
|
|
if (!n--)
|
|
return SEQ_START_TOKEN;
|
|
hash = n >> 32;
|
|
export = n & ((1LL<<32) - 1);
|
|
|
|
|
|
for (ch=export_table[hash]; ch; ch=ch->next)
|
|
if (!export--)
|
|
return ch;
|
|
n &= ~((1LL<<32) - 1);
|
|
do {
|
|
hash++;
|
|
n += 1LL<<32;
|
|
} while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
|
|
if (hash >= EXPORT_HASHMAX)
|
|
return NULL;
|
|
*pos = n+1;
|
|
return export_table[hash];
|
|
}
|
|
|
|
static void *e_next(struct seq_file *m, void *p, loff_t *pos)
|
|
{
|
|
struct cache_head *ch = p;
|
|
int hash = (*pos >> 32);
|
|
|
|
if (p == SEQ_START_TOKEN)
|
|
hash = 0;
|
|
else if (ch->next == NULL) {
|
|
hash++;
|
|
*pos += 1LL<<32;
|
|
} else {
|
|
++*pos;
|
|
return ch->next;
|
|
}
|
|
*pos &= ~((1LL<<32) - 1);
|
|
while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
|
|
hash++;
|
|
*pos += 1LL<<32;
|
|
}
|
|
if (hash >= EXPORT_HASHMAX)
|
|
return NULL;
|
|
++*pos;
|
|
return export_table[hash];
|
|
}
|
|
|
|
static void e_stop(struct seq_file *m, void *p)
|
|
__releases(svc_export_cache.hash_lock)
|
|
{
|
|
read_unlock(&svc_export_cache.hash_lock);
|
|
exp_readunlock();
|
|
}
|
|
|
|
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_NOHIDE, {"nohide", ""}},
|
|
{ NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
|
|
{ NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
|
|
{ NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
|
|
#ifdef MSNFS
|
|
{ NFSEXP_MSNFS, {"msnfs", ""}},
|
|
#endif
|
|
{ 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 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 lastflags = 0, first = 0;
|
|
|
|
if (exp->ex_nflavors == 0)
|
|
return;
|
|
for (f = exp->ex_flavors; f < end; f++) {
|
|
if (first || f->flags != lastflags) {
|
|
if (!first)
|
|
show_secinfo_flags(m, lastflags);
|
|
seq_printf(m, ",sec=%d", f->pseudoflavor);
|
|
lastflags = f->flags;
|
|
} else {
|
|
seq_printf(m, ":%d", f->pseudoflavor);
|
|
}
|
|
}
|
|
show_secinfo_flags(m, lastflags);
|
|
}
|
|
|
|
static void exp_flags(struct seq_file *m, int flag, int fsid,
|
|
uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
|
|
{
|
|
show_expflags(m, flag, NFSEXP_ALLFLAGS);
|
|
if (flag & NFSEXP_FSID)
|
|
seq_printf(m, ",fsid=%d", fsid);
|
|
if (anonu != (uid_t)-2 && anonu != (0x10000-2))
|
|
seq_printf(m, ",anonuid=%u", anonu);
|
|
if (anong != (gid_t)-2 && anong != (0x10000-2))
|
|
seq_printf(m, ",anongid=%u", 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);
|
|
|
|
if (p == SEQ_START_TOKEN) {
|
|
seq_puts(m, "# Version 1.1\n");
|
|
seq_puts(m, "# Path Client(Flags) # IPs\n");
|
|
return 0;
|
|
}
|
|
|
|
cache_get(&exp->h);
|
|
if (cache_check(&svc_export_cache, &exp->h, NULL))
|
|
return 0;
|
|
cache_put(&exp->h, &svc_export_cache);
|
|
return svc_export_show(m, &svc_export_cache, cp);
|
|
}
|
|
|
|
struct seq_operations nfs_exports_op = {
|
|
.start = e_start,
|
|
.next = e_next,
|
|
.stop = e_stop,
|
|
.show = e_show,
|
|
};
|
|
|
|
/*
|
|
* Add or modify a client.
|
|
* Change requests may involve the list of host addresses. The list of
|
|
* exports and possibly existing uid maps are left untouched.
|
|
*/
|
|
int
|
|
exp_addclient(struct nfsctl_client *ncp)
|
|
{
|
|
struct auth_domain *dom;
|
|
int i, err;
|
|
struct in6_addr addr6;
|
|
|
|
/* First, consistency check. */
|
|
err = -EINVAL;
|
|
if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
|
|
goto out;
|
|
if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
|
|
goto out;
|
|
|
|
/* Lock the hashtable */
|
|
exp_writelock();
|
|
|
|
dom = unix_domain_find(ncp->cl_ident);
|
|
|
|
err = -ENOMEM;
|
|
if (!dom)
|
|
goto out_unlock;
|
|
|
|
/* Insert client into hashtable. */
|
|
for (i = 0; i < ncp->cl_naddr; i++) {
|
|
ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
|
|
auth_unix_add_addr(&addr6, dom);
|
|
}
|
|
auth_unix_forget_old(dom);
|
|
auth_domain_put(dom);
|
|
|
|
err = 0;
|
|
|
|
out_unlock:
|
|
exp_writeunlock();
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Delete a client given an identifier.
|
|
*/
|
|
int
|
|
exp_delclient(struct nfsctl_client *ncp)
|
|
{
|
|
int err;
|
|
struct auth_domain *dom;
|
|
|
|
err = -EINVAL;
|
|
if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
|
|
goto out;
|
|
|
|
/* Lock the hashtable */
|
|
exp_writelock();
|
|
|
|
dom = auth_domain_find(ncp->cl_ident);
|
|
/* just make sure that no addresses work
|
|
* and that it will expire soon
|
|
*/
|
|
if (dom) {
|
|
err = auth_unix_forget_old(dom);
|
|
auth_domain_put(dom);
|
|
}
|
|
|
|
exp_writeunlock();
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Verify that string is non-empty and does not exceed max length.
|
|
*/
|
|
static int
|
|
exp_verify_string(char *cp, int max)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < max; i++)
|
|
if (!cp[i])
|
|
return i;
|
|
cp[i] = 0;
|
|
printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialize the exports module.
|
|
*/
|
|
int
|
|
nfsd_export_init(void)
|
|
{
|
|
int rv;
|
|
dprintk("nfsd: initializing export module.\n");
|
|
|
|
rv = cache_register(&svc_export_cache);
|
|
if (rv)
|
|
return rv;
|
|
rv = cache_register(&svc_expkey_cache);
|
|
if (rv)
|
|
cache_unregister(&svc_export_cache);
|
|
return rv;
|
|
|
|
}
|
|
|
|
/*
|
|
* Flush exports table - called when last nfsd thread is killed
|
|
*/
|
|
void
|
|
nfsd_export_flush(void)
|
|
{
|
|
exp_writelock();
|
|
cache_purge(&svc_expkey_cache);
|
|
cache_purge(&svc_export_cache);
|
|
exp_writeunlock();
|
|
}
|
|
|
|
/*
|
|
* Shutdown the exports module.
|
|
*/
|
|
void
|
|
nfsd_export_shutdown(void)
|
|
{
|
|
|
|
dprintk("nfsd: shutting down export module.\n");
|
|
|
|
exp_writelock();
|
|
|
|
cache_unregister(&svc_expkey_cache);
|
|
cache_unregister(&svc_export_cache);
|
|
svcauth_unix_purge();
|
|
|
|
exp_writeunlock();
|
|
dprintk("nfsd: export shutdown complete.\n");
|
|
}
|