13d88ac54d
-----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCZUpEaAAKCRCRxhvAZXjc ounBAQCAoS66gnOZ+k4kOWwB2zZ1Ueh3dPFC7IcEZ+pwFS8hpAEAxUQxV0TSWf5l W/1oKRtAJyuSYvehHeMUSJmHVBiM8w4= =bNm0 -----END PGP SIGNATURE----- Merge tag 'vfs-6.7.fsid' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs fanotify fsid updates from Christian Brauner: "This work is part of the plan to enable fanotify to serve as a drop-in replacement for inotify. While inotify is availabe on all filesystems, fanotify currently isn't. In order to support fanotify on all filesystems two things are needed: (1) all filesystems need to support AT_HANDLE_FID (2) all filesystems need to report a non-zero f_fsid This contains (1) and allows filesystems to encode non-decodable file handlers for fanotify without implementing any exportfs operations by encoding a file id of type FILEID_INO64_GEN from i_ino and i_generation. Filesystems that want to opt out of encoding non-decodable file ids for fanotify that don't support NFS export can do so by providing an empty export_operations struct. This also partially addresses (2) by generating f_fsid for simple filesystems as well as freevxfs. Remaining filesystems will be dealt with by separate patches. Finally, this contains the patch from the current exportfs maintainers which moves exportfs under vfs with Chuck, Jeff, and Amir as maintainers and vfs.git as tree" * tag 'vfs-6.7.fsid' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: MAINTAINERS: create an entry for exportfs fs: fix build error with CONFIG_EXPORTFS=m or not defined freevxfs: derive f_fsid from bdev->bd_dev fs: report f_fsid from s_dev for "simple" filesystems exportfs: support encoding non-decodeable file handles by default exportfs: define FILEID_INO64_GEN* file handle types exportfs: make ->encode_fh() a mandatory method for NFS export exportfs: add helpers to check if filesystem can encode/decode file handles
1449 lines
36 KiB
C
1449 lines
36 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/slab.h>
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#include <linux/namei.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_xprt.h>
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#include "nfsd.h"
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#include "nfsfh.h"
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#include "netns.h"
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#include "pnfs.h"
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#include "filecache.h"
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#include "trace.h"
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#define NFSDDBG_FACILITY NFSDDBG_EXPORT
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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 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_rcu(key, ek_rcu);
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}
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static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
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{
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return sunrpc_cache_pipe_upcall(cd, h);
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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 cache_detail *cd, struct svc_expkey *new,
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struct svc_expkey *old);
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static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
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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 expiry [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 = NULL;
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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)
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goto out;
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err = -EINVAL;
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if (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 (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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err = get_expiry(&mesg, &key.h.expiry_time);
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if (err)
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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(cd, &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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len = qword_get(&mesg, buf, PAGE_SIZE);
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if (len < 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(cd, &key, ek);
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if (ek)
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trace_nfsd_expkey_update(ek, NULL);
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else
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err = -ENOMEM;
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} else {
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err = kern_path(buf, 0, &key.ek_path);
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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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ek = svc_expkey_update(cd, &key, ek);
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if (ek)
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trace_nfsd_expkey_update(ek, buf);
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else
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err = -ENOMEM;
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path_put(&key.ek_path);
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}
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cache_flush();
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out:
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if (ek)
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cache_put(&ek->h, cd);
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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 void expkey_flush(void)
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{
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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
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svc_expkey_hash(struct svc_expkey *item)
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{
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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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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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{
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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);
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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 cache_detail *cd, struct svc_expkey *new,
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struct svc_expkey *old)
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{
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struct cache_head *ch;
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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)
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{
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struct nfsd4_fs_location *locations = fsloc->locations;
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int i;
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if (!locations)
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return;
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for (i = 0; i < fsloc->locations_count; i++) {
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kfree(locations[i].path);
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kfree(locations[i].hosts);
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}
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kfree(locations);
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fsloc->locations = NULL;
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}
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|
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static int export_stats_init(struct export_stats *stats)
|
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{
|
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stats->start_time = ktime_get_seconds();
|
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return nfsd_percpu_counters_init(stats->counter, EXP_STATS_COUNTERS_NUM);
|
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}
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|
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static void export_stats_reset(struct export_stats *stats)
|
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{
|
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if (stats)
|
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nfsd_percpu_counters_reset(stats->counter,
|
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EXP_STATS_COUNTERS_NUM);
|
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}
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|
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static void export_stats_destroy(struct export_stats *stats)
|
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{
|
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if (stats)
|
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nfsd_percpu_counters_destroy(stats->counter,
|
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EXP_STATS_COUNTERS_NUM);
|
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}
|
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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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nfsd4_fslocs_free(&exp->ex_fslocs);
|
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export_stats_destroy(exp->ex_stats);
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kfree(exp->ex_stats);
|
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kfree(exp->ex_uuid);
|
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kfree_rcu(exp, ex_rcu);
|
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}
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|
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static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
|
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{
|
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return sunrpc_cache_pipe_upcall(cd, h);
|
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}
|
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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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|
|
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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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|
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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 path *path, int *flags, unsigned char *uuid)
|
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{
|
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struct inode *inode = d_inode(path->dentry);
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|
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/*
|
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* We currently export only dirs, regular files, and (for v4
|
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* pseudoroot) symlinks.
|
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*/
|
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if (!S_ISDIR(inode->i_mode) &&
|
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!S_ISLNK(inode->i_mode) &&
|
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!S_ISREG(inode->i_mode))
|
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return -ENOTDIR;
|
|
|
|
/*
|
|
* Mountd should never pass down a writeable V4ROOT export, but,
|
|
* just to make sure:
|
|
*/
|
|
if (*flags & NFSEXP_V4ROOT)
|
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*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.
|
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* 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) &&
|
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!(*flags & NFSEXP_FSID) &&
|
|
uuid == NULL) {
|
|
dprintk("exp_export: export of non-dev fs without fsid\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!exportfs_can_decode_fh(inode->i_sb->s_export_op)) {
|
|
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 int xprtsec_parse(char **mesg, char *buf, struct svc_export *exp)
|
|
{
|
|
unsigned int i, mode, listsize;
|
|
int err;
|
|
|
|
err = get_uint(mesg, &listsize);
|
|
if (err)
|
|
return err;
|
|
if (listsize > NFSEXP_XPRTSEC_NUM)
|
|
return -EINVAL;
|
|
|
|
exp->ex_xprtsec_modes = 0;
|
|
for (i = 0; i < listsize; i++) {
|
|
err = get_uint(mesg, &mode);
|
|
if (err)
|
|
return err;
|
|
if (mode > NFSEXP_XPRTSEC_MTLS)
|
|
return -EINVAL;
|
|
exp->ex_xprtsec_modes |= mode;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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 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;
|
|
if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
|
|
goto out;
|
|
|
|
err = -ENOENT;
|
|
dom = auth_domain_find(buf);
|
|
if (!dom)
|
|
goto out;
|
|
|
|
/* path */
|
|
err = -EINVAL;
|
|
if (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;
|
|
exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL;
|
|
|
|
/* expiry */
|
|
err = get_expiry(&mesg, &exp.h.expiry_time);
|
|
if (err)
|
|
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 (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 if (strcmp(buf, "xprtsec") == 0)
|
|
err = xprtsec_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) {
|
|
struct percpu_counter *counter = exp->ex_stats->counter;
|
|
|
|
seq_printf(m, "\t%lld\n", exp->ex_stats->start_time);
|
|
seq_printf(m, "\tfh_stale: %lld\n",
|
|
percpu_counter_sum_positive(&counter[EXP_STATS_FH_STALE]));
|
|
seq_printf(m, "\tio_read: %lld\n",
|
|
percpu_counter_sum_positive(&counter[EXP_STATS_IO_READ]));
|
|
seq_printf(m, "\tio_write: %lld\n",
|
|
percpu_counter_sum_positive(&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];
|
|
}
|
|
new->ex_xprtsec_modes = item->ex_xprtsec_modes;
|
|
}
|
|
|
|
static struct cache_head *svc_export_alloc(void)
|
|
{
|
|
struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
|
|
if (!i)
|
|
return NULL;
|
|
|
|
i->ex_stats = kmalloc(sizeof(*(i->ex_stats)), GFP_KERNEL);
|
|
if (!i->ex_stats) {
|
|
kfree(i);
|
|
return NULL;
|
|
}
|
|
|
|
if (export_stats_init(i->ex_stats)) {
|
|
kfree(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, *end = exp->ex_flavors + exp->ex_nflavors;
|
|
struct svc_xprt *xprt = rqstp->rq_xprt;
|
|
|
|
if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_NONE) {
|
|
if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags))
|
|
goto ok;
|
|
}
|
|
if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_TLS) {
|
|
if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
|
|
!test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
|
|
goto ok;
|
|
}
|
|
if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_MTLS) {
|
|
if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
|
|
test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
|
|
goto ok;
|
|
}
|
|
goto denied;
|
|
|
|
ok:
|
|
/* 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;
|
|
|
|
denied:
|
|
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
|
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nfsd_export_shutdown(struct net *net)
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{
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
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cache_unregister_net(nn->svc_expkey_cache, net);
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cache_unregister_net(nn->svc_export_cache, net);
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cache_destroy_net(nn->svc_expkey_cache, net);
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cache_destroy_net(nn->svc_export_cache, net);
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svcauth_unix_purge(net);
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dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
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}
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