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9ceddd9da1
Convert structs svc_expkey and svc_export to allow RCU protected lookups. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1292 lines
32 KiB
C
1292 lines
32 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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#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 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 ((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(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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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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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 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_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 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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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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kfree(exp->ex_uuid);
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kfree_rcu(exp, ex_rcu);
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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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static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
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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;
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/*
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* Mountd should never pass down a writeable V4ROOT export, but,
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* just to make sure:
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*/
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if (*flags & NFSEXP_V4ROOT)
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*flags |= NFSEXP_READONLY;
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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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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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#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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{
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int len;
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int migrated, i, err;
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/* more than one fsloc */
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if (fsloc->locations)
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return -EINVAL;
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/* listsize */
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err = get_uint(mesg, &fsloc->locations_count);
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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;
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if (fsloc->locations_count == 0)
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return 0;
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fsloc->locations = kcalloc(fsloc->locations_count,
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sizeof(struct nfsd4_fs_location),
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GFP_KERNEL);
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if (!fsloc->locations)
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return -ENOMEM;
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for (i=0; i < fsloc->locations_count; i++) {
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/* colon separated host list */
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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_free_all;
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err = -ENOMEM;
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fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
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if (!fsloc->locations[i].hosts)
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goto out_free_all;
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err = -EINVAL;
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/* slash separated path component list */
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len = qword_get(mesg, buf, PAGE_SIZE);
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if (len <= 0)
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goto out_free_all;
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err = -ENOMEM;
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fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
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if (!fsloc->locations[i].path)
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goto out_free_all;
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}
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/* migrated */
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err = get_int(mesg, &migrated);
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if (err)
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goto out_free_all;
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err = -EINVAL;
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if (migrated < 0 || migrated > 1)
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goto out_free_all;
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fsloc->migrated = migrated;
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return 0;
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out_free_all:
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nfsd4_fslocs_free(fsloc);
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return err;
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}
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static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
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{
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struct exp_flavor_info *f;
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u32 listsize;
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int err;
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/* more than one secinfo */
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if (exp->ex_nflavors)
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return -EINVAL;
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err = get_uint(mesg, &listsize);
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if (err)
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return err;
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if (listsize > MAX_SECINFO_LIST)
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return -EINVAL;
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for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
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err = get_uint(mesg, &f->pseudoflavor);
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if (err)
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return err;
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/*
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* XXX: It would be nice to also check whether this
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* pseudoflavor is supported, so we can discover the
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* problem at export time instead of when a client fails
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* to authenticate.
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*/
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err = get_uint(mesg, &f->flags);
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if (err)
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return err;
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/* Only some flags are allowed to differ between flavors: */
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if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
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return -EINVAL;
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}
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exp->ex_nflavors = listsize;
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return 0;
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}
|
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|
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#else /* CONFIG_NFSD_V4 */
|
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static inline int
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fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
|
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static inline int
|
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secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
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#endif
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|
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static inline int
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nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
|
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{
|
|
int len;
|
|
|
|
/* more than one uuid */
|
|
if (*puuid)
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return -EINVAL;
|
|
|
|
/* expect a 16 byte uuid encoded as \xXXXX... */
|
|
len = qword_get(mesg, buf, PAGE_SIZE);
|
|
if (len != EX_UUID_LEN)
|
|
return -EINVAL;
|
|
|
|
*puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
|
|
if (*puuid == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
|
|
{
|
|
/* client path expiry [flags anonuid anongid fsid] */
|
|
char *buf;
|
|
int len;
|
|
int err;
|
|
struct auth_domain *dom = NULL;
|
|
struct svc_export exp = {}, *expp;
|
|
int an_int;
|
|
|
|
if (mesg[mlen-1] != '\n')
|
|
return -EINVAL;
|
|
mesg[mlen-1] = 0;
|
|
|
|
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
/* client */
|
|
err = -EINVAL;
|
|
len = qword_get(&mesg, buf, PAGE_SIZE);
|
|
if (len <= 0)
|
|
goto out;
|
|
|
|
err = -ENOENT;
|
|
dom = auth_domain_find(buf);
|
|
if (!dom)
|
|
goto out;
|
|
|
|
/* path */
|
|
err = -EINVAL;
|
|
if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
|
|
goto out1;
|
|
|
|
err = kern_path(buf, 0, &exp.ex_path);
|
|
if (err)
|
|
goto out1;
|
|
|
|
exp.ex_client = dom;
|
|
exp.cd = cd;
|
|
exp.ex_devid_map = NULL;
|
|
|
|
/* expiry */
|
|
err = -EINVAL;
|
|
exp.h.expiry_time = get_expiry(&mesg);
|
|
if (exp.h.expiry_time == 0)
|
|
goto out3;
|
|
|
|
/* flags */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err == -ENOENT) {
|
|
err = 0;
|
|
set_bit(CACHE_NEGATIVE, &exp.h.flags);
|
|
} else {
|
|
if (err || an_int < 0)
|
|
goto out3;
|
|
exp.ex_flags= an_int;
|
|
|
|
/* anon uid */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err)
|
|
goto out3;
|
|
exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
|
|
|
|
/* anon gid */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err)
|
|
goto out3;
|
|
exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
|
|
|
|
/* fsid */
|
|
err = get_int(&mesg, &an_int);
|
|
if (err)
|
|
goto out3;
|
|
exp.ex_fsid = an_int;
|
|
|
|
while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
|
|
if (strcmp(buf, "fsloc") == 0)
|
|
err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
|
|
else if (strcmp(buf, "uuid") == 0)
|
|
err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
|
|
else if (strcmp(buf, "secinfo") == 0)
|
|
err = secinfo_parse(&mesg, buf, &exp);
|
|
else
|
|
/* quietly ignore unknown words and anything
|
|
* following. Newer user-space can try to set
|
|
* new values, then see what the result was.
|
|
*/
|
|
break;
|
|
if (err)
|
|
goto out4;
|
|
}
|
|
|
|
err = check_export(d_inode(exp.ex_path.dentry), &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)
|
|
expp = svc_export_update(&exp, expp);
|
|
else
|
|
err = -ENOMEM;
|
|
cache_flush();
|
|
if (expp == NULL)
|
|
err = -ENOMEM;
|
|
else
|
|
exp_put(expp);
|
|
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 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 < 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;
|
|
}
|
|
|
|
static void export_update(struct cache_head *cnew, struct cache_head *citem)
|
|
{
|
|
struct svc_export *new = container_of(cnew, struct svc_export, h);
|
|
struct svc_export *item = container_of(citem, struct svc_export, h);
|
|
int i;
|
|
|
|
new->ex_flags = item->ex_flags;
|
|
new->ex_anon_uid = item->ex_anon_uid;
|
|
new->ex_anon_gid = item->ex_anon_gid;
|
|
new->ex_fsid = item->ex_fsid;
|
|
new->ex_devid_map = item->ex_devid_map;
|
|
item->ex_devid_map = NULL;
|
|
new->ex_uuid = item->ex_uuid;
|
|
item->ex_uuid = NULL;
|
|
new->ex_fslocs.locations = item->ex_fslocs.locations;
|
|
item->ex_fslocs.locations = NULL;
|
|
new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
|
|
item->ex_fslocs.locations_count = 0;
|
|
new->ex_fslocs.migrated = item->ex_fslocs.migrated;
|
|
item->ex_fslocs.migrated = 0;
|
|
new->ex_layout_types = item->ex_layout_types;
|
|
new->ex_nflavors = item->ex_nflavors;
|
|
for (i = 0; i < MAX_SECINFO_LIST; i++) {
|
|
new->ex_flavors[i] = item->ex_flavors[i];
|
|
}
|
|
}
|
|
|
|
static struct cache_head *svc_export_alloc(void)
|
|
{
|
|
struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
|
|
if (i)
|
|
return &i->h;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
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_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)
|
|
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)
|
|
return ERR_PTR(err);
|
|
return exp;
|
|
}
|
|
|
|
/*
|
|
* Find the export entry for a given dentry.
|
|
*/
|
|
static struct svc_export *
|
|
exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
|
|
{
|
|
struct dentry *saved = dget(path->dentry);
|
|
struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
|
|
|
|
while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
|
|
struct dentry *parent = dget_parent(path->dentry);
|
|
dput(path->dentry);
|
|
path->dentry = parent;
|
|
exp = exp_get_by_name(cd, clp, path, NULL);
|
|
}
|
|
dput(path->dentry);
|
|
path->dentry = saved;
|
|
return exp;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Obtain the root fh on behalf of a client.
|
|
* This could be done in user space, but I feel that it adds some safety
|
|
* since its harder to fool a kernel module than a user space program.
|
|
*/
|
|
int
|
|
exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
|
|
struct knfsd_fh *f, int maxsize)
|
|
{
|
|
struct svc_export *exp;
|
|
struct path path;
|
|
struct inode *inode;
|
|
struct svc_fh fh;
|
|
int err;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct cache_detail *cd = nn->svc_export_cache;
|
|
|
|
err = -EPERM;
|
|
/* NB: we probably ought to check that it's NUL-terminated */
|
|
if (kern_path(name, 0, &path)) {
|
|
printk("nfsd: exp_rootfh path not found %s", name);
|
|
return err;
|
|
}
|
|
inode = d_inode(path.dentry);
|
|
|
|
dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
|
|
name, path.dentry, clp->name,
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
exp = exp_parent(cd, clp, &path);
|
|
if (IS_ERR(exp)) {
|
|
err = PTR_ERR(exp);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* fh must be initialized before calling fh_compose
|
|
*/
|
|
fh_init(&fh, maxsize);
|
|
if (fh_compose(&fh, exp, path.dentry, NULL))
|
|
err = -EINVAL;
|
|
else
|
|
err = 0;
|
|
memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
|
|
fh_put(&fh);
|
|
exp_put(exp);
|
|
out:
|
|
path_put(&path);
|
|
return err;
|
|
}
|
|
|
|
static struct svc_export *exp_find(struct cache_detail *cd,
|
|
struct auth_domain *clp, int fsid_type,
|
|
u32 *fsidv, struct cache_req *reqp)
|
|
{
|
|
struct svc_export *exp;
|
|
struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
|
|
struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
|
|
if (IS_ERR(ek))
|
|
return ERR_CAST(ek);
|
|
|
|
exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
|
|
cache_put(&ek->h, nn->svc_expkey_cache);
|
|
|
|
if (IS_ERR(exp))
|
|
return ERR_CAST(exp);
|
|
return exp;
|
|
}
|
|
|
|
__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
|
|
{
|
|
struct exp_flavor_info *f;
|
|
struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
|
|
|
|
/* legacy gss-only clients are always OK: */
|
|
if (exp->ex_client == rqstp->rq_gssclient)
|
|
return 0;
|
|
/* ip-address based client; check sec= export option: */
|
|
for (f = exp->ex_flavors; f < end; f++) {
|
|
if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
|
|
return 0;
|
|
}
|
|
/* defaults in absence of sec= options: */
|
|
if (exp->ex_nflavors == 0) {
|
|
if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
|
|
rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
|
|
return 0;
|
|
}
|
|
|
|
/* If the compound op contains a spo_must_allowed op,
|
|
* it will be sent with integrity/protection which
|
|
* will have to be expressly allowed on mounts that
|
|
* don't support it
|
|
*/
|
|
|
|
if (nfsd4_spo_must_allow(rqstp))
|
|
return 0;
|
|
|
|
return 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)
|
|
{
|
|
show_expflags(m, flag, NFSEXP_ALLFLAGS);
|
|
if (flag & NFSEXP_FSID)
|
|
seq_printf(m, ",fsid=%d", fsid);
|
|
if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
|
|
!uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
|
|
seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
|
|
if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
|
|
!gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
|
|
seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, 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;
|
|
|
|
if (p == SEQ_START_TOKEN) {
|
|
seq_puts(m, "# Version 1.1\n");
|
|
seq_puts(m, "# Path Client(Flags) # IPs\n");
|
|
return 0;
|
|
}
|
|
|
|
exp_get(exp);
|
|
if (cache_check(cd, &exp->h, NULL))
|
|
return 0;
|
|
exp_put(exp);
|
|
return svc_export_show(m, cd, cp);
|
|
}
|
|
|
|
const struct seq_operations nfs_exports_op = {
|
|
.start = cache_seq_start_rcu,
|
|
.next = cache_seq_next_rcu,
|
|
.stop = cache_seq_stop_rcu,
|
|
.show = e_show,
|
|
};
|
|
|
|
/*
|
|
* Initialize the exports module.
|
|
*/
|
|
int
|
|
nfsd_export_init(struct net *net)
|
|
{
|
|
int rv;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
|
|
|
|
nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
|
|
if (IS_ERR(nn->svc_export_cache))
|
|
return PTR_ERR(nn->svc_export_cache);
|
|
rv = cache_register_net(nn->svc_export_cache, net);
|
|
if (rv)
|
|
goto destroy_export_cache;
|
|
|
|
nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
|
|
if (IS_ERR(nn->svc_expkey_cache)) {
|
|
rv = PTR_ERR(nn->svc_expkey_cache);
|
|
goto unregister_export_cache;
|
|
}
|
|
rv = cache_register_net(nn->svc_expkey_cache, net);
|
|
if (rv)
|
|
goto destroy_expkey_cache;
|
|
return 0;
|
|
|
|
destroy_expkey_cache:
|
|
cache_destroy_net(nn->svc_expkey_cache, net);
|
|
unregister_export_cache:
|
|
cache_unregister_net(nn->svc_export_cache, net);
|
|
destroy_export_cache:
|
|
cache_destroy_net(nn->svc_export_cache, net);
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* Flush exports table - called when last nfsd thread is killed
|
|
*/
|
|
void
|
|
nfsd_export_flush(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
cache_purge(nn->svc_expkey_cache);
|
|
cache_purge(nn->svc_export_cache);
|
|
}
|
|
|
|
/*
|
|
* Shutdown the exports module.
|
|
*/
|
|
void
|
|
nfsd_export_shutdown(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
|
|
|
|
cache_unregister_net(nn->svc_expkey_cache, net);
|
|
cache_unregister_net(nn->svc_export_cache, net);
|
|
cache_destroy_net(nn->svc_expkey_cache, net);
|
|
cache_destroy_net(nn->svc_export_cache, net);
|
|
svcauth_unix_purge(net);
|
|
|
|
dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
|
|
}
|