1 /*
2 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
3 * Copyright (c) 2017-2018 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef STRACE_NETLINK_H
30 #define STRACE_NETLINK_H
31
32 #include <stdbool.h>
33 #include <sys/socket.h>
34 #include <linux/netlink.h>
35
36 #ifndef NETLINK_SOCK_DIAG
37 # define NETLINK_SOCK_DIAG 4
38 #endif
39
40 #ifndef NLM_F_NONREC
41 # define NLM_F_NONREC 0x100
42 #endif
43 #ifndef NLM_F_CAPPED
44 # define NLM_F_CAPPED 0x100
45 #endif
46
47 #undef NLMSG_HDRLEN
48 #define NLMSG_HDRLEN ((unsigned int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
49
50 #ifndef NLMSG_MIN_TYPE
51 # define NLMSG_MIN_TYPE 0x10
52 #endif
53
54 #ifndef NLA_ALIGN
55 # define NLA_ALIGN(len) (((len) + 3) & ~3)
56 #endif
57
58 #undef NLA_HDRLEN
59 #define NLA_HDRLEN ((unsigned int) NLA_ALIGN(sizeof(struct nlattr)))
60
61 #ifndef NLA_TYPE_MASK
62 # define NLA_F_NESTED (1 << 15)
63 # define NLA_F_NET_BYTEORDER (1 << 14)
64 # define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
65 #endif
66
67 static inline bool
is_nlmsg_ok(const struct nlmsghdr * const nlh,const ssize_t len)68 is_nlmsg_ok(const struct nlmsghdr *const nlh, const ssize_t len)
69 {
70 return len >= (ssize_t) sizeof(*nlh)
71 && nlh->nlmsg_len >= sizeof(*nlh)
72 && (size_t) len >= nlh->nlmsg_len;
73 }
74
75 #endif /* !STRACE_NETLINK_H */
76