1 /*
2 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
3 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
4 * Copyright (c) 2016-2018 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_route.h"
32 #include "nlattr.h"
33 #include "print_fields.h"
34
35 #include "netlink.h"
36 #include <linux/rtnetlink.h>
37 #ifdef HAVE_LINUX_IF_ADDR_H
38 # include <linux/if_addr.h>
39 #endif
40
41 #include "xlat/ifaddrflags.h"
42 #include "xlat/routing_scopes.h"
43 #include "xlat/rtnl_addr_attrs.h"
44
45 static bool
decode_ifa_address(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,const void * const opaque_data)46 decode_ifa_address(struct tcb *const tcp,
47 const kernel_ulong_t addr,
48 const unsigned int len,
49 const void *const opaque_data)
50 {
51 const struct ifaddrmsg *const ifaddr = opaque_data;
52
53 decode_inet_addr(tcp, addr, len, ifaddr->ifa_family, NULL);
54
55 return true;
56 }
57
58 static bool
decode_ifa_cacheinfo(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,const void * const opaque_data)59 decode_ifa_cacheinfo(struct tcb *const tcp,
60 const kernel_ulong_t addr,
61 const unsigned int len,
62 const void *const opaque_data)
63 {
64 struct ifa_cacheinfo ci;
65
66 if (len < sizeof(ci))
67 return false;
68 else if (!umove_or_printaddr(tcp, addr, &ci)) {
69 PRINT_FIELD_U("{", ci, ifa_prefered);
70 PRINT_FIELD_U(", ", ci, ifa_valid);
71 PRINT_FIELD_U(", ", ci, cstamp);
72 PRINT_FIELD_U(", ", ci, tstamp);
73 tprintf("}");
74 }
75
76 return true;
77 }
78
79 static bool
decode_ifa_flags(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,const void * const opaque_data)80 decode_ifa_flags(struct tcb *const tcp,
81 const kernel_ulong_t addr,
82 const unsigned int len,
83 const void *const opaque_data)
84 {
85 uint32_t ifa_flags;
86
87 if (len < sizeof(ifa_flags))
88 return false;
89 else if (!umove_or_printaddr(tcp, addr, &ifa_flags))
90 printflags(ifaddrflags, ifa_flags, "IFA_F_???");
91
92 return true;
93 }
94
95 static const nla_decoder_t ifaddrmsg_nla_decoders[] = {
96 [IFA_ADDRESS] = decode_ifa_address,
97 [IFA_LOCAL] = decode_ifa_address,
98 [IFA_LABEL] = decode_nla_str,
99 [IFA_BROADCAST] = decode_ifa_address,
100 [IFA_ANYCAST] = decode_ifa_address,
101 [IFA_CACHEINFO] = decode_ifa_cacheinfo,
102 [IFA_MULTICAST] = decode_ifa_address,
103 [IFA_FLAGS] = decode_ifa_flags
104 };
105
DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)106 DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)
107 {
108 struct ifaddrmsg ifaddr = { .ifa_family = family };
109 size_t offset = sizeof(ifaddr.ifa_family);
110 bool decode_nla = false;
111
112 PRINT_FIELD_XVAL("{", ifaddr, ifa_family, addrfams, "AF_???");
113
114 tprints(", ");
115 if (len >= sizeof(ifaddr)) {
116 if (!umoven_or_printaddr(tcp, addr + offset,
117 sizeof(ifaddr) - offset,
118 (char *) &ifaddr + offset)) {
119 PRINT_FIELD_U("", ifaddr, ifa_prefixlen);
120 PRINT_FIELD_FLAGS(", ", ifaddr, ifa_flags,
121 ifaddrflags, "IFA_F_???");
122 PRINT_FIELD_XVAL(", ", ifaddr, ifa_scope,
123 routing_scopes, NULL);
124 PRINT_FIELD_IFINDEX(", ", ifaddr, ifa_index);
125 decode_nla = true;
126 }
127 } else
128 tprints("...");
129 tprints("}");
130
131 offset = NLMSG_ALIGN(sizeof(ifaddr));
132 if (decode_nla && len > offset) {
133 tprints(", ");
134 decode_nlattr(tcp, addr + offset, len - offset,
135 rtnl_addr_attrs, "IFA_???",
136 ifaddrmsg_nla_decoders,
137 ARRAY_SIZE(ifaddrmsg_nla_decoders), &ifaddr);
138 }
139 }
140