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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 #include "nlattr.h"
34 #include "print_fields.h"
35 
36 #include <linux/sock_diag.h>
37 #include <linux/unix_diag.h>
38 
39 #include "xlat/unix_diag_attrs.h"
40 #include "xlat/unix_diag_show.h"
41 
DECL_NETLINK_DIAG_DECODER(decode_unix_diag_req)42 DECL_NETLINK_DIAG_DECODER(decode_unix_diag_req)
43 {
44 	struct unix_diag_req req = { .sdiag_family = family };
45 	const size_t offset = sizeof(req.sdiag_family);
46 
47 	PRINT_FIELD_XVAL("{", req, sdiag_family, addrfams, "AF_???");
48 	tprints(", ");
49 	if (len >= sizeof(req)) {
50 		if (!umoven_or_printaddr(tcp, addr + offset,
51 					 sizeof(req) - offset,
52 					 (char *) &req + offset)) {
53 			PRINT_FIELD_U("", req, sdiag_protocol);
54 			PRINT_FIELD_FLAGS(", ", req, udiag_states,
55 					  tcp_state_flags, "1<<TCP_???");
56 			PRINT_FIELD_U(", ", req, udiag_ino);
57 			PRINT_FIELD_FLAGS(", ", req, udiag_show,
58 					  unix_diag_show, "UDIAG_SHOW_???");
59 			PRINT_FIELD_COOKIE(", ", req, udiag_cookie);
60 		}
61 	} else
62 		tprints("...");
63 	tprints("}");
64 }
65 
66 static bool
decode_unix_diag_vfs(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,const void * const opaque_data)67 decode_unix_diag_vfs(struct tcb *const tcp,
68 		     const kernel_ulong_t addr,
69 		     const unsigned int len,
70 		     const void *const opaque_data)
71 {
72 	struct unix_diag_vfs uv;
73 
74 	if (len < sizeof(uv))
75 		return false;
76 	if (umove_or_printaddr(tcp, addr, &uv))
77 		return true;
78 
79 	PRINT_FIELD_DEV("{", uv, udiag_vfs_dev);
80 	PRINT_FIELD_U(", ", uv, udiag_vfs_ino);
81 	tprints("}");
82 
83 	return true;
84 }
85 
86 static bool
print_inode(struct tcb * const tcp,void * const elem_buf,const size_t elem_size,void * const opaque_data)87 print_inode(struct tcb *const tcp,
88 	    void *const elem_buf,
89 	    const size_t elem_size,
90 	    void *const opaque_data)
91 {
92 	tprintf("%" PRIu32, *(uint32_t *) elem_buf);
93 
94 	return true;
95 }
96 
97 static bool
decode_unix_diag_inode(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,const void * const opaque_data)98 decode_unix_diag_inode(struct tcb *const tcp,
99 		       const kernel_ulong_t addr,
100 		       const unsigned int len,
101 		       const void *const opaque_data)
102 {
103 	uint32_t inode;
104 	const size_t nmemb = len / sizeof(inode);
105 
106 	if (!nmemb)
107 		return false;
108 
109 	print_array(tcp, addr, nmemb, &inode, sizeof(inode),
110 		    tfetch_mem, print_inode, 0);
111 
112 	return true;
113 }
114 
115 static bool
decode_unix_diag_rqlen(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,const void * const opaque_data)116 decode_unix_diag_rqlen(struct tcb *const tcp,
117 		       const kernel_ulong_t addr,
118 		       const unsigned int len,
119 		       const void *const opaque_data)
120 {
121 	struct unix_diag_rqlen rql;
122 
123 	if (len < sizeof(rql))
124 		return false;
125 	if (umove_or_printaddr(tcp, addr, &rql))
126 		return true;
127 
128 	PRINT_FIELD_U("{", rql, udiag_rqueue);
129 	PRINT_FIELD_U(", ", rql, udiag_wqueue);
130 	tprints("}");
131 
132 	return true;
133 }
134 
135 static const nla_decoder_t unix_diag_msg_nla_decoders[] = {
136 	[UNIX_DIAG_NAME]	= decode_nla_str,
137 	[UNIX_DIAG_VFS]		= decode_unix_diag_vfs,
138 	[UNIX_DIAG_PEER]	= decode_nla_u32,
139 	[UNIX_DIAG_ICONS]	= decode_unix_diag_inode,
140 	[UNIX_DIAG_RQLEN]	= decode_unix_diag_rqlen,
141 	[UNIX_DIAG_MEMINFO]	= decode_nla_meminfo,
142 	[UNIX_DIAG_SHUTDOWN]	= decode_nla_u8
143 };
144 
DECL_NETLINK_DIAG_DECODER(decode_unix_diag_msg)145 DECL_NETLINK_DIAG_DECODER(decode_unix_diag_msg)
146 {
147 	struct unix_diag_msg msg = { .udiag_family = family };
148 	size_t offset = sizeof(msg.udiag_family);
149 	bool decode_nla = false;
150 
151 	PRINT_FIELD_XVAL("{", msg, udiag_family, addrfams, "AF_???");
152 	tprints(", ");
153 	if (len >= sizeof(msg)) {
154 		if (!umoven_or_printaddr(tcp, addr + offset,
155 					 sizeof(msg) - offset,
156 					 (char *) &msg + offset)) {
157 			PRINT_FIELD_XVAL("", msg, udiag_type,
158 					 socktypes, "SOCK_???");
159 			PRINT_FIELD_XVAL(", ", msg, udiag_state,
160 					 tcp_states, "TCP_???");
161 			PRINT_FIELD_U(", ", msg, udiag_ino);
162 			PRINT_FIELD_COOKIE(", ", msg, udiag_cookie);
163 			decode_nla = true;
164 		}
165 	} else
166 		tprints("...");
167 	tprints("}");
168 
169 	offset = NLMSG_ALIGN(sizeof(msg));
170 	if (decode_nla && len > offset) {
171 		tprints(", ");
172 		decode_nlattr(tcp, addr + offset, len - offset,
173 			      unix_diag_attrs, "UNIX_DIAG_???",
174 			      unix_diag_msg_nla_decoders,
175 			      ARRAY_SIZE(unix_diag_msg_nla_decoders), NULL);
176 	}
177 }
178