1 /*
2 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
3 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
4 * Copyright (c) 2017-2018 The strace developers.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "defs.h"
31 #include "netlink.h"
32 #include "netlink_sock_diag.h"
33
34 #define XLAT_MACROS_ONLY
35 #include "xlat/addrfams.h"
36 #undef XLAT_MACROS_ONLY
37
38 static void
decode_family(struct tcb * const tcp,const uint8_t family,const kernel_ulong_t addr,const unsigned int len)39 decode_family(struct tcb *const tcp, const uint8_t family,
40 const kernel_ulong_t addr, const unsigned int len)
41 {
42 tprints("{family=");
43 printxval(addrfams, family, "AF_???");
44 if (len > sizeof(family)) {
45 tprints(", ");
46 printstr_ex(tcp, addr + sizeof(family),
47 len - sizeof(family), QUOTE_FORCE_HEX);
48 }
49 tprints("}");
50 }
51
52 typedef DECL_NETLINK_DIAG_DECODER((*netlink_diag_decoder_t));
53
54 static const struct {
55 const netlink_diag_decoder_t request, response;
56 } diag_decoders[] = {
57 [AF_UNIX] = { decode_unix_diag_req, decode_unix_diag_msg },
58 [AF_INET] = { decode_inet_diag_req, decode_inet_diag_msg },
59 [AF_INET6] = { decode_inet_diag_req, decode_inet_diag_msg },
60 [AF_NETLINK] = { decode_netlink_diag_req, decode_netlink_diag_msg },
61 [AF_PACKET] = { decode_packet_diag_req, decode_packet_diag_msg },
62 [AF_SMC] = { decode_smc_diag_req, decode_smc_diag_msg },
63 };
64
65 bool
decode_netlink_sock_diag(struct tcb * const tcp,const struct nlmsghdr * const nlmsghdr,const kernel_ulong_t addr,const unsigned int len)66 decode_netlink_sock_diag(struct tcb *const tcp,
67 const struct nlmsghdr *const nlmsghdr,
68 const kernel_ulong_t addr,
69 const unsigned int len)
70 {
71 uint8_t family;
72
73 if (nlmsghdr->nlmsg_type == NLMSG_DONE)
74 return false;
75
76 if (!umove_or_printaddr(tcp, addr, &family)) {
77 if (family < ARRAY_SIZE(diag_decoders)
78 && len > sizeof(family)) {
79 const netlink_diag_decoder_t decoder =
80 (nlmsghdr->nlmsg_flags & NLM_F_REQUEST)
81 ? diag_decoders[family].request
82 : diag_decoders[family].response;
83
84 if (decoder) {
85 decoder(tcp, nlmsghdr, family, addr, len);
86 return true;
87 }
88 }
89
90 decode_family(tcp, family, addr, len);
91 }
92
93 return true;
94 }
95