Release 4.10 fs/nfsd/export.c

/*
 * NFS exporting and validation.
 *
 * We maintain a list of clients, each of which has a list of
 * exports. To export an fs to a given client, you first have
 * to create the client entry with NFSCTL_ADDCLIENT, which
 * creates a client control block and adds it to the hash
 * table. Then, you call NFSCTL_EXPORT for each fs.
 *
 *
 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
 */

#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/module.h>
#include <linux/exportfs.h>
#include <linux/sunrpc/svc_xprt.h>

#include "nfsd.h"
#include "nfsfh.h"
#include "netns.h"
#include "pnfs.h"


#define NFSDDBG_FACILITY	NFSDDBG_EXPORT

/*
 * We have two caches.
 * One maps client+vfsmnt+dentry to export options - the export map
 * The other maps client+filehandle-fragment to export options. - the expkey map
 *
 * The export options are actually stored in the first map, and the
 * second map contains a reference to the entry in the first map.
 */


#define	EXPKEY_HASHBITS		8

#define	EXPKEY_HASHMAX		(1 << EXPKEY_HASHBITS)

#define	EXPKEY_HASHMASK		(EXPKEY_HASHMAX -1)



static void expkey_put(struct kref *ref)
{
	struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);

	if (test_bit(CACHE_VALID, &key->h.flags) &&
	    !test_bit(CACHE_NEGATIVE, &key->h.flags))
		path_put(&key->ek_path);
	auth_domain_put(key->ek_client);
	kfree(key);
}

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static void expkey_request(struct cache_detail *cd,
			   struct cache_head *h,
			   char **bpp, int *blen)
{
	/* client fsidtype \xfsid */
	struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
	char type[5];

	qword_add(bpp, blen, ek->ek_client->name);
	snprintf(type, 5, "%d", ek->ek_fsidtype);
	qword_add(bpp, blen, type);
	qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
	(*bpp)[-1] = '\n';
}

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static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
					    struct svc_expkey *old);
static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);



static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
{
	/* client fsidtype fsid expiry [path] */
	char *buf;
	int len;
	struct auth_domain *dom = NULL;
	int err;
	int fsidtype;
	char *ep;
	struct svc_expkey key;
	struct svc_expkey *ek = NULL;

	if (mesg[mlen - 1] != '\n')
		return -EINVAL;
	mesg[mlen-1] = 0;

	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	err = -ENOMEM;
	if (!buf)
		goto out;

	err = -EINVAL;
	if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
		goto out;

	err = -ENOENT;
	dom = auth_domain_find(buf);
	if (!dom)
		goto out;
	dprintk("found domain %s\n", buf);

	err = -EINVAL;
	if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
		goto out;
	fsidtype = simple_strtoul(buf, &ep, 10);
	if (*ep)
		goto out;
	dprintk("found fsidtype %d\n", fsidtype);
	if (key_len(fsidtype)==0) /* invalid type */
		goto out;
	if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
		goto out;
	dprintk("found fsid length %d\n", len);
	if (len != key_len(fsidtype))
		goto out;

	/* OK, we seem to have a valid key */
	key.h.flags = 0;
	key.h.expiry_time = get_expiry(&mesg);
	if (key.h.expiry_time == 0)
		goto out;

	key.ek_client = dom;	
	key.ek_fsidtype = fsidtype;
	memcpy(key.ek_fsid, buf, len);

	ek = svc_expkey_lookup(cd, &key);
	err = -ENOMEM;
	if (!ek)
		goto out;

	/* now we want a pathname, or empty meaning NEGATIVE  */
	err = -EINVAL;
	len = qword_get(&mesg, buf, PAGE_SIZE);
	if (len < 0)
		goto out;
	dprintk("Path seems to be <%s>\n", buf);
	err = 0;
	if (len == 0) {
		set_bit(CACHE_NEGATIVE, &key.h.flags);
		ek = svc_expkey_update(cd, &key, ek);
		if (!ek)
			err = -ENOMEM;
	} else {
		err = kern_path(buf, 0, &key.ek_path);
		if (err)
			goto out;

		dprintk("Found the path %s\n", buf);

		ek = svc_expkey_update(cd, &key, ek);
		if (!ek)
			err = -ENOMEM;
		path_put(&key.ek_path);
	}
	cache_flush();
 out:
	if (ek)
		cache_put(&ek->h, cd);
	if (dom)
		auth_domain_put(dom);
	kfree(buf);
	return err;
}

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static int expkey_show(struct seq_file *m,
		       struct cache_detail *cd,
		       struct cache_head *h)
{
	struct svc_expkey *ek ;
	int i;

	if (h ==NULL) {
		seq_puts(m, "#domain fsidtype fsid [path]\n");
		return 0;
	}
	ek = container_of(h, struct svc_expkey, h);
	seq_printf(m, "%s %d 0x", ek->ek_client->name,
		   ek->ek_fsidtype);
	for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
		seq_printf(m, "%08x", ek->ek_fsid[i]);
	if (test_bit(CACHE_VALID, &h->flags) && 
	    !test_bit(CACHE_NEGATIVE, &h->flags)) {
		seq_printf(m, " ");
		seq_path(m, &ek->ek_path, "\\ \t\n");
	}
	seq_printf(m, "\n");
	return 0;
}

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static inline int expkey_match (struct cache_head *a, struct cache_head *b)
{
	struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
	struct svc_expkey *new = container_of(b, struct svc_expkey, h);

	if (orig->ek_fsidtype != new->ek_fsidtype ||
	    orig->ek_client != new->ek_client ||
	    memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
		return 0;
	return 1;
}

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static inline void expkey_init(struct cache_head *cnew,
				   struct cache_head *citem)
{
	struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
	struct svc_expkey *item = container_of(citem, struct svc_expkey, h);

	kref_get(&item->ek_client->ref);
	new->ek_client = item->ek_client;
	new->ek_fsidtype = item->ek_fsidtype;

	memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
}

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static inline void expkey_update(struct cache_head *cnew,
				   struct cache_head *citem)
{
	struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
	struct svc_expkey *item = container_of(citem, struct svc_expkey, h);

	new->ek_path = item->ek_path;
	path_get(&item->ek_path);
}

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static struct cache_head *expkey_alloc(void)
{
	struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
	if (i)
		return &i->h;
	else
		return NULL;
}

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static struct cache_detail svc_expkey_cache_template = {
	.owner		= THIS_MODULE,
	.hash_size	= EXPKEY_HASHMAX,
	.name		= "nfsd.fh",
	.cache_put	= expkey_put,
	.cache_request	= expkey_request,
	.cache_parse	= expkey_parse,
	.cache_show	= expkey_show,
	.match		= expkey_match,
	.init		= expkey_init,
	.update       	= expkey_update,
	.alloc		= expkey_alloc,
};


static int

svc_expkey_hash(struct svc_expkey *item)
{
	int hash = item->ek_fsidtype;
	char * cp = (char*)item->ek_fsid;
	int len = key_len(item->ek_fsidtype);

	hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
	hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
	hash &= EXPKEY_HASHMASK;
	return hash;
}

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static struct svc_expkey *

svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
{
	struct cache_head *ch;
	int hash = svc_expkey_hash(item);

	ch = sunrpc_cache_lookup(cd, &item->h, hash);
	if (ch)
		return container_of(ch, struct svc_expkey, h);
	else
		return NULL;
}

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static struct svc_expkey *

svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
		  struct svc_expkey *old)
{
	struct cache_head *ch;
	int hash = svc_expkey_hash(new);

	ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
	if (ch)
		return container_of(ch, struct svc_expkey, h);
	else
		return NULL;
}


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#define	EXPORT_HASHBITS		8

#define	EXPORT_HASHMAX		(1<< EXPORT_HASHBITS)



static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
{
	struct nfsd4_fs_location *locations = fsloc->locations;
	int i;

	if (!locations)
		return;

	for (i = 0; i < fsloc->locations_count; i++) {
		kfree(locations[i].path);
		kfree(locations[i].hosts);
	}

	kfree(locations);
	fsloc->locations = NULL;
}

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static void svc_export_put(struct kref *ref)
{
	struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
	path_put(&exp->ex_path);
	auth_domain_put(exp->ex_client);
	nfsd4_fslocs_free(&exp->ex_fslocs);
	kfree(exp->ex_uuid);
	kfree(exp);
}

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static void svc_export_request(struct cache_detail *cd,
			       struct cache_head *h,
			       char **bpp, int *blen)
{
	/*  client path */
	struct svc_export *exp = container_of(h, struct svc_export, h);
	char *pth;

	qword_add(bpp, blen, exp->ex_client->name);
	pth = d_path(&exp->ex_path, *bpp, *blen);
	if (IS_ERR(pth)) {
		/* is this correct? */
		(*bpp)[0] = '\n';
		return;
	}
	qword_add(bpp, blen, pth);
	(*bpp)[-1] = '\n';
}

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static struct svc_export *svc_export_update(struct svc_export *new,
					    struct svc_export *old);
static struct svc_export *svc_export_lookup(struct svc_export *);



static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
{

	/*
         * We currently export only dirs, regular files, and (for v4
         * pseudoroot) symlinks.
         */
	if (!S_ISDIR(inode->i_mode) &&
	    !S_ISLNK(inode->i_mode) &&
	    !S_ISREG(inode->i_mode))
		return -ENOTDIR;

	/*
         * Mountd should never pass down a writeable V4ROOT export, but,
         * just to make sure:
         */
	if (*flags & NFSEXP_V4ROOT)
		*flags |= NFSEXP_READONLY;

	/* There are two requirements on a filesystem to be exportable.
         * 1:  We must be able to identify the filesystem from a number.
         *       either a device number (so FS_REQUIRES_DEV needed)
         *       or an FSID number (so NFSEXP_FSID or ->uuid is needed).
         * 2:  We must be able to find an inode from a filehandle.
         *       This means that s_export_op must be set.
         */
	if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
	    !(*flags & NFSEXP_FSID) &&
	    uuid == NULL) {
		dprintk("exp_export: export of non-dev fs without fsid\n");
		return -EINVAL;
	}

	if (!inode->i_sb->s_export_op ||
	    !inode->i_sb->s_export_op->fh_to_dentry) {
		dprintk("exp_export: export of invalid fs type.\n");
		return -EINVAL;
	}

	return 0;

}

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#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 = kzalloc(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;
}

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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;
}

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#else /* CONFIG_NFSD_V4 */

static inline int

fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
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static inline int

secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
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#endif


static inline int

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;
}

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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