1*4882a593Smuzhiyun // SPDX-License-Identifier: BSD-3-Clause
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/net/sunrpc/auth_gss/auth_gss_internal.h
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Internal definitions for RPCSEC_GSS client authentication
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (c) 2000 The Regents of the University of Michigan.
8*4882a593Smuzhiyun * All rights reserved.
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #include <linux/err.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun #include <linux/sunrpc/xdr.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun static inline const void *
simple_get_bytes(const void * p,const void * end,void * res,size_t len)16*4882a593Smuzhiyun simple_get_bytes(const void *p, const void *end, void *res, size_t len)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun const void *q = (const void *)((const char *)p + len);
19*4882a593Smuzhiyun if (unlikely(q > end || q < p))
20*4882a593Smuzhiyun return ERR_PTR(-EFAULT);
21*4882a593Smuzhiyun memcpy(res, p, len);
22*4882a593Smuzhiyun return q;
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun static inline const void *
simple_get_netobj(const void * p,const void * end,struct xdr_netobj * dest)26*4882a593Smuzhiyun simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun const void *q;
29*4882a593Smuzhiyun unsigned int len;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun p = simple_get_bytes(p, end, &len, sizeof(len));
32*4882a593Smuzhiyun if (IS_ERR(p))
33*4882a593Smuzhiyun return p;
34*4882a593Smuzhiyun q = (const void *)((const char *)p + len);
35*4882a593Smuzhiyun if (unlikely(q > end || q < p))
36*4882a593Smuzhiyun return ERR_PTR(-EFAULT);
37*4882a593Smuzhiyun if (len) {
38*4882a593Smuzhiyun dest->data = kmemdup(p, len, GFP_NOFS);
39*4882a593Smuzhiyun if (unlikely(dest->data == NULL))
40*4882a593Smuzhiyun return ERR_PTR(-ENOMEM);
41*4882a593Smuzhiyun } else
42*4882a593Smuzhiyun dest->data = NULL;
43*4882a593Smuzhiyun dest->len = len;
44*4882a593Smuzhiyun return q;
45*4882a593Smuzhiyun }
46