2 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
3 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
4 * Copyright (c) 2016-2017 The strace developers.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
31 #include <sys/socket.h>
32 #include <linux/audit.h>
33 #include <linux/netlink.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/xfrm.h>
36 #include "xlat/netlink_flags.h"
37 #include "xlat/netlink_protocols.h"
38 #include "xlat/netlink_types.h"
39 #include "xlat/nl_audit_types.h"
40 #include "xlat/nl_route_types.h"
41 #include "xlat/nl_selinux_types.h"
42 #include "xlat/nl_sock_diag_types.h"
43 #include "xlat/nl_xfrm_types.h"
46 #define NLMSG_HDRLEN NLMSG_ALIGN(sizeof(struct nlmsghdr))
49 * Fetch a struct nlmsghdr from the given address.
52 fetch_nlmsghdr(struct tcb *const tcp, struct nlmsghdr *const nlmsghdr,
53 const kernel_ulong_t addr, const kernel_ulong_t len)
55 if (len < sizeof(struct nlmsghdr)) {
56 printstrn(tcp, addr, len);
60 if (umove_or_printaddr(tcp, addr, nlmsghdr))
68 NL_FAMILY_DEFAULT = -2
72 get_fd_nl_family(struct tcb *const tcp, const int fd)
74 const unsigned long inode = getfdinode(tcp, fd);
76 return NL_FAMILY_ERROR;
78 const char *const details = get_sockaddr_by_inode(tcp, fd, inode);
80 return NL_FAMILY_ERROR;
82 const char *const nl_details = STR_STRIP_PREFIX(details, "NETLINK:[");
83 if (nl_details == details)
84 return NL_FAMILY_ERROR;
86 const struct xlat *xlats = netlink_protocols;
87 for (; xlats->str; ++xlats) {
88 const char *name = STR_STRIP_PREFIX(xlats->str, "NETLINK_");
89 if (!strncmp(nl_details, name, strlen(name)))
93 if (*nl_details >= '0' && *nl_details <= '9')
94 return atoi(nl_details);
96 return NL_FAMILY_ERROR;
100 const struct xlat *const xlat;
101 const char *const dflt;
103 [NETLINK_AUDIT] = { nl_audit_types, "AUDIT_???" },
104 [NETLINK_ROUTE] = { nl_route_types, "RTM_???" },
105 [NETLINK_SELINUX] = { nl_selinux_types, "SELNL_MSG_???" },
106 [NETLINK_SOCK_DIAG] = { nl_sock_diag_types, "SOCK_DIAG_???" },
107 [NETLINK_XFRM] = { nl_xfrm_types, "XFRM_MSG_???" }
111 * As all valid netlink families are positive integers, use unsigned int
112 * for family here to filter out NL_FAMILY_ERROR and NL_FAMILY_DEFAULT.
115 decode_nlmsg_type(const uint16_t type, const unsigned int family)
117 if (family < ARRAY_SIZE(nlmsg_types)
118 && nlmsg_types[family].xlat) {
119 printxval(nlmsg_types[family].xlat, type, nlmsg_types[family].dflt);
121 printxval(netlink_types, type, "NLMSG_???");
126 print_nlmsghdr(struct tcb *tcp,
129 const struct nlmsghdr *const nlmsghdr)
131 /* print the whole structure regardless of its nlmsg_len */
133 tprintf("{len=%u, type=", nlmsghdr->nlmsg_len);
135 const int hdr_family = (nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE)
137 : (family != NL_FAMILY_DEFAULT
138 ? family : get_fd_nl_family(tcp, fd));
140 decode_nlmsg_type(nlmsghdr->nlmsg_type, hdr_family);
143 printflags(netlink_flags, nlmsghdr->nlmsg_flags, "NLM_F_???");
145 tprintf(", seq=%u, pid=%u}", nlmsghdr->nlmsg_seq,
146 nlmsghdr->nlmsg_pid);
148 return family != NL_FAMILY_DEFAULT ? family : hdr_family;
152 decode_nlmsghdr_with_payload(struct tcb *const tcp,
155 const struct nlmsghdr *const nlmsghdr,
156 const kernel_ulong_t addr,
157 const kernel_ulong_t len);
160 decode_nlmsgerr(struct tcb *const tcp,
168 if (len < sizeof(err.error)) {
169 printstrn(tcp, addr, len);
173 if (umove_or_printaddr(tcp, addr, &err.error))
177 if (err.error < 0 && (unsigned) -err.error < nerrnos) {
178 tprintf("-%s", errnoent[-err.error]);
180 tprintf("%d", err.error);
183 addr += offsetof(struct nlmsgerr, msg);
184 len -= offsetof(struct nlmsgerr, msg);
188 if (fetch_nlmsghdr(tcp, &err.msg, addr, len)) {
189 decode_nlmsghdr_with_payload(tcp, fd, family,
190 &err.msg, addr, len);
198 decode_payload(struct tcb *const tcp,
201 const struct nlmsghdr *const nlmsghdr,
202 const kernel_ulong_t addr,
203 const kernel_ulong_t len)
205 if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
206 decode_nlmsgerr(tcp, fd, family, addr, len);
208 } else if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
211 if (!umove_or_printaddr(tcp, addr, &num))
216 printstrn(tcp, addr, len);
220 decode_nlmsghdr_with_payload(struct tcb *const tcp,
223 const struct nlmsghdr *const nlmsghdr,
224 const kernel_ulong_t addr,
225 const kernel_ulong_t len)
229 family = print_nlmsghdr(tcp, fd, family, nlmsghdr);
231 unsigned int nlmsg_len =
232 nlmsghdr->nlmsg_len > len ? len : nlmsghdr->nlmsg_len;
233 if (nlmsg_len > NLMSG_HDRLEN) {
235 decode_payload(tcp, fd, family, nlmsghdr, addr + NLMSG_HDRLEN,
236 nlmsg_len - NLMSG_HDRLEN);
243 decode_netlink(struct tcb *const tcp,
248 struct nlmsghdr nlmsghdr;
249 bool print_array = false;
252 for (elt = 0; fetch_nlmsghdr(tcp, &nlmsghdr, addr, len); elt++) {
253 if (abbrev(tcp) && elt == max_strlen) {
258 unsigned int nlmsg_len = NLMSG_ALIGN(nlmsghdr.nlmsg_len);
259 kernel_ulong_t next_addr = 0;
260 kernel_ulong_t next_len = 0;
262 if (nlmsghdr.nlmsg_len >= NLMSG_HDRLEN) {
263 next_len = (len >= nlmsg_len) ? len - nlmsg_len : 0;
265 if (next_len && addr + nlmsg_len > addr)
266 next_addr = addr + nlmsg_len;
269 if (!print_array && next_addr) {
274 decode_nlmsghdr_with_payload(tcp, fd, NL_FAMILY_DEFAULT,
275 &nlmsghdr, addr, len);