static ssize_t write_getfs(struct file *file, char *buf, size_t size)
{
struct nfsctl_fsparm *data;
struct sockaddr_in *sin;
struct auth_domain *clp;
int err = 0;
struct knfsd_fh *res;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_fsparm*)buf;
err = -EPROTONOSUPPORT;
if (data->gd_addr.sa_family != AF_INET)
goto out;
sin = (struct sockaddr_in *)&data->gd_addr;
if (data->gd_maxlen > NFS3_FHSIZE)
data->gd_maxlen = NFS3_FHSIZE;
res = (struct knfsd_fh*)buf;
exp_readlock();
if (!(clp = auth_unix_lookup(sin->sin_addr)))
err = -EPERM;
else {
err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
auth_domain_put(clp);
}
exp_readunlock();
if (err == 0)
err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
out:
return err;
}
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
/* request is:
* domain path maxsize
* response is
* filehandle
*
* qword quoting is used, so filehandle will be \x....
*/
char *dname, *path;
int maxsize;
char *mesg = buf;
int len;
struct auth_domain *dom;
struct knfsd_fh fh;
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
dname = mesg;
len = qword_get(&mesg, dname, size);
if (len <= 0) return -EINVAL;
path = dname+len+1;
len = qword_get(&mesg, path, size);
if (len <= 0) return -EINVAL;
len = get_int(&mesg, &maxsize);
if (len)
return len;
if (maxsize < NFS_FHSIZE)
return -EINVAL;
if (maxsize > NFS3_FHSIZE)
maxsize = NFS3_FHSIZE;
if (qword_get(&mesg, mesg, size)>0)
return -EINVAL;
/* we have all the words, they are in buf.. */
dom = unix_domain_find(dname);
if (!dom)
return -ENOMEM;
len = exp_rootfh(dom, path, &fh, maxsize);
auth_domain_put(dom);
if (len)
return len;
mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
mesg[-1] = '\n';
return mesg - buf;
}
void expkey_put(struct cache_head *item, struct cache_detail *cd)
{
if (cache_put(item, cd)) {
struct svc_expkey *key = container_of(item, struct svc_expkey, h);
if (test_bit(CACHE_VALID, &item->flags) &&
!test_bit(CACHE_NEGATIVE, &item->flags))
exp_put(key->ek_export);
auth_domain_put(key->ek_client);
kfree(key);
}
}
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
char *dname, *path;
int uninitialized_var(maxsize);
char *mesg = buf;
int len;
struct auth_domain *dom;
struct knfsd_fh fh;
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
dname = mesg;
len = qword_get(&mesg, dname, size);
if (len <= 0)
return -EINVAL;
path = dname+len+1;
len = qword_get(&mesg, path, size);
if (len <= 0)
return -EINVAL;
len = get_int(&mesg, &maxsize);
if (len)
return len;
if (maxsize < NFS_FHSIZE)
return -EINVAL;
if (maxsize > NFS3_FHSIZE)
maxsize = NFS3_FHSIZE;
if (qword_get(&mesg, mesg, size)>0)
return -EINVAL;
dom = unix_domain_find(dname);
if (!dom)
return -ENOMEM;
len = exp_rootfh(dom, path, &fh, maxsize);
auth_domain_put(dom);
if (len)
return len;
mesg = buf;
len = SIMPLE_TRANSACTION_LIMIT;
qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
mesg[-1] = '\n';
return mesg - buf;
}
/**
* write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
*
* Deprecated. /proc/fs/nfsd/filehandle is preferred.
* Function remains to support old versions of nfs-utils.
*
* Input:
* buf: struct nfsctl_fdparm
* gd_addr: socket address of client
* gd_path: '\0'-terminated C string
* containing pathname of
* directory in local file system
* gd_version: fdparm structure version
* size: size in bytes of passed in nfsctl_fdparm
* Output:
* On success: passed-in buffer filled with nfsctl_res
* (a fixed-length raw NFS file handle);
* return code is the size in bytes of the file handle
* On error: return code is negative errno value
*
* Note: Only AF_INET client addresses are passed in, since gd_addr
* is the same size as a struct sockaddr_in.
*/
static ssize_t write_getfd(struct file *file, char *buf, size_t size)
{
struct nfsctl_fdparm *data;
struct sockaddr_in *sin;
struct auth_domain *clp;
int err = 0;
struct knfsd_fh fh;
char *res;
struct in6_addr in6;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_fdparm*)buf;
err = -EPROTONOSUPPORT;
if (data->gd_addr.sa_family != AF_INET)
goto out;
err = -EINVAL;
if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
goto out;
res = buf;
sin = (struct sockaddr_in *)&data->gd_addr;
exp_readlock();
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
clp = auth_unix_lookup(&init_net, &in6);
if (!clp)
err = -EPERM;
else {
err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
auth_domain_put(clp);
}
exp_readunlock();
if (err == 0) {
memset(res,0, NFS_FHSIZE);
memcpy(res, &fh.fh_base, fh.fh_size);
err = NFS_FHSIZE;
}
out:
return err;
}
int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
{
/* client fsidtype fsid [path] */
char *buf;
int len;
struct auth_domain *dom = NULL;
int err;
int fsidtype;
char *ep;
struct svc_expkey key;
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 (fsidtype > 2)
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);
/* now we want a pathname, or empty meaning NEGATIVE */
if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
goto out;
dprintk("Path seems to be <%s>\n", buf);
err = 0;
if (len == 0) {
struct svc_expkey *ek;
set_bit(CACHE_NEGATIVE, &key.h.flags);
ek = svc_expkey_lookup(&key, 1);
if (ek)
expkey_put(&ek->h, &svc_expkey_cache);
} else {
struct nameidata nd;
struct svc_expkey *ek;
struct svc_export *exp;
err = path_lookup(buf, 0, &nd);
if (err)
goto out;
dprintk("Found the path %s\n", buf);
exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
err = -ENOENT;
if (!exp)
goto out_nd;
key.ek_export = exp;
dprintk("And found export\n");
ek = svc_expkey_lookup(&key, 1);
if (ek)
expkey_put(&ek->h, &svc_expkey_cache);
exp_put(exp);
err = 0;
out_nd:
path_release(&nd);
}
cache_flush();
out:
if (dom)
auth_domain_put(dom);
if (buf)
kfree(buf);
return err;
}
