1 /*
2 * Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "defs.h"
29
30 #include DEF_MPERS_TYPE(struct_sock_fprog)
31
32 #include <linux/filter.h>
33 typedef struct sock_fprog struct_sock_fprog;
34
35 #include MPERS_DEFS
36 #include "bpf_fprog.h"
37
MPERS_PRINTER_DECL(unsigned int,get_sock_fprog_size,void)38 MPERS_PRINTER_DECL(unsigned int, get_sock_fprog_size, void)
39 {
40 return sizeof(struct_sock_fprog);
41 }
42
MPERS_PRINTER_DECL(bool,fetch_bpf_fprog,struct tcb * const tcp,const kernel_ulong_t addr,void * const p)43 MPERS_PRINTER_DECL(bool, fetch_bpf_fprog, struct tcb *const tcp,
44 const kernel_ulong_t addr, void *const p)
45 {
46 struct bpf_fprog *pfp = p;
47 struct_sock_fprog mfp;
48
49 if ((sizeof(*pfp) == sizeof(mfp))
50 && (offsetof(struct bpf_fprog, filter) ==
51 offsetof(struct_sock_fprog, filter)))
52 return !umove_or_printaddr(tcp, addr, pfp);
53
54 if (umove_or_printaddr(tcp, addr, &mfp))
55 return false;
56
57 pfp->len = mfp.len;
58 pfp->filter =
59 #ifndef IN_MPERS
60 (uintptr_t)
61 #endif
62 mfp.filter;
63 return true;
64 }
65