1 /*
2 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
3 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
4 * Copyright (c) 2017 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 static void
decode_family(struct tcb * const tcp,const uint8_t family,const kernel_ulong_t addr,const unsigned int len)35 decode_family(struct tcb *const tcp, const uint8_t family,
36 const kernel_ulong_t addr, const unsigned int len)
37 {
38 tprints("{family=");
39 printxval(addrfams, family, "AF_???");
40 if (len > sizeof(family)) {
41 tprints(", ");
42 printstr_ex(tcp, addr + sizeof(family),
43 len - sizeof(family), QUOTE_FORCE_HEX);
44 }
45 tprints("}");
46 }
47
48 typedef DECL_NETLINK_DIAG_DECODER((*netlink_diag_decoder_t));
49
50 static const struct {
51 const netlink_diag_decoder_t request, response;
52 } diag_decoders[] = {
53 [AF_INET] = { decode_inet_diag_req, decode_inet_diag_msg },
54 [AF_INET6] = { decode_inet_diag_req, decode_inet_diag_msg },
55 [AF_NETLINK] = { decode_netlink_diag_req, decode_netlink_diag_msg },
56 [AF_PACKET] = { decode_packet_diag_req, decode_packet_diag_msg },
57 #ifdef AF_SMC
58 [AF_SMC] = { decode_smc_diag_req, decode_smc_diag_msg },
59 #endif
60 [AF_UNIX] = { decode_unix_diag_req, decode_unix_diag_msg }
61 };
62
63 bool
decode_netlink_sock_diag(struct tcb * const tcp,const struct nlmsghdr * const nlmsghdr,const kernel_ulong_t addr,const unsigned int len)64 decode_netlink_sock_diag(struct tcb *const tcp,
65 const struct nlmsghdr *const nlmsghdr,
66 const kernel_ulong_t addr,
67 const unsigned int len)
68 {
69 uint8_t family;
70
71 if (nlmsghdr->nlmsg_type == NLMSG_DONE)
72 return false;
73
74 if (!umove_or_printaddr(tcp, addr, &family)) {
75 if (family < ARRAY_SIZE(diag_decoders)
76 && len > sizeof(family)) {
77 const netlink_diag_decoder_t decoder =
78 (nlmsghdr->nlmsg_flags & NLM_F_REQUEST)
79 ? diag_decoders[family].request
80 : diag_decoders[family].response;
81
82 if (decoder) {
83 decoder(tcp, nlmsghdr, family, addr, len);
84 return true;
85 }
86 }
87
88 decode_family(tcp, family, addr, len);
89 }
90
91 return true;
92 }
93