static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
struct idmap_msg *upcall,
struct key *key, struct key *authkey)
{
char id_str[NFS_UINT_MAXLEN];
size_t len;
int ret = -ENOKEY;
/* ret = -ENOKEY */
if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
goto out;
switch (im->im_conv) {
case IDMAP_CONV_NAMETOID:
if (strcmp(upcall->im_name, im->im_name) != 0)
break;
/* Note: here we store the NUL terminator too */
len = 1 + nfs_map_numeric_to_string(im->im_id, id_str,
sizeof(id_str));
ret = nfs_idmap_instantiate(key, authkey, id_str, len);
break;
case IDMAP_CONV_IDTONAME:
if (upcall->im_id != im->im_id)
break;
len = strlen(im->im_name);
ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
break;
default:
ret = -EINVAL;
}
out:
return ret;
}
int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
{
int ret = -EINVAL;
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(gid, "group", buf, buflen);
if (ret < 0)
ret = nfs_map_numeric_to_string(gid, buf, buflen);
return ret;
}
/* ID -> Name */
static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
size_t buflen, struct idmap *idmap)
{
char id_str[NFS_UINT_MAXLEN];
int id_len;
ssize_t ret;
id_len = nfs_map_numeric_to_string(id, id_str, sizeof(id_str));
ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
if (ret < 0)
return -EINVAL;
return ret;
}
int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
{
struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL;
__u32 id;
id = from_kgid(&init_user_ns, gid);
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
if (ret < 0)
ret = nfs_map_numeric_to_string(id, buf, buflen);
trace_nfs4_map_gid_to_group(buf, ret, id, ret);
return ret;
}
