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/netlink.h>
33 #include "xlat/netlink_flags.h"
34 #include "xlat/netlink_protocols.h"
35 #include "xlat/netlink_types.h"
36 #include "xlat/nl_sock_diag_types.h"
39 #define NLMSG_HDRLEN NLMSG_ALIGN(sizeof(struct nlmsghdr))
42 * Fetch a struct nlmsghdr from the given address.
45 fetch_nlmsghdr(struct tcb *const tcp, struct nlmsghdr *const nlmsghdr,
46 const kernel_ulong_t addr, const kernel_ulong_t len)
48 if (len < sizeof(struct nlmsghdr)) {
49 printstrn(tcp, addr, len);
53 if (umove_or_printaddr(tcp, addr, nlmsghdr))
61 NL_FAMILY_DEFAULT = -2
65 get_fd_nl_family(struct tcb *const tcp, const int fd)
67 const unsigned long inode = getfdinode(tcp, fd);
69 return NL_FAMILY_ERROR;
71 const char *const details = get_sockaddr_by_inode(tcp, fd, inode);
73 return NL_FAMILY_ERROR;
75 const char *const nl_details = STR_STRIP_PREFIX(details, "NETLINK:[");
76 if (nl_details == details)
77 return NL_FAMILY_ERROR;
79 const struct xlat *xlats = netlink_protocols;
80 for (; xlats->str; ++xlats) {
81 const char *name = STR_STRIP_PREFIX(xlats->str, "NETLINK_");
82 if (!strncmp(nl_details, name, strlen(name)))
86 if (*nl_details >= '0' && *nl_details <= '9')
87 return atoi(nl_details);
89 return NL_FAMILY_ERROR;
93 const struct xlat *const xlat;
94 const char *const dflt;
96 [NETLINK_SOCK_DIAG] = { nl_sock_diag_types, "SOCK_DIAG_???" }
100 * As all valid netlink families are positive integers, use unsigned int
101 * for family here to filter out NL_FAMILY_ERROR and NL_FAMILY_DEFAULT.
104 decode_nlmsg_type(const uint16_t type, const unsigned int family)
106 if (family < ARRAY_SIZE(nlmsg_types)
107 && nlmsg_types[family].xlat) {
108 printxval(nlmsg_types[family].xlat, type, nlmsg_types[family].dflt);
110 printxval(netlink_types, type, "NLMSG_???");
115 print_nlmsghdr(struct tcb *tcp,
118 const struct nlmsghdr *const nlmsghdr)
120 /* print the whole structure regardless of its nlmsg_len */
122 tprintf("{len=%u, type=", nlmsghdr->nlmsg_len);
124 const int hdr_family = (nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE)
126 : (family != NL_FAMILY_DEFAULT
127 ? family : get_fd_nl_family(tcp, fd));
129 decode_nlmsg_type(nlmsghdr->nlmsg_type, hdr_family);
132 printflags(netlink_flags, nlmsghdr->nlmsg_flags, "NLM_F_???");
134 tprintf(", seq=%u, pid=%u}", nlmsghdr->nlmsg_seq,
135 nlmsghdr->nlmsg_pid);
137 return family != NL_FAMILY_DEFAULT ? family : hdr_family;
141 decode_nlmsghdr_with_payload(struct tcb *const tcp,
144 const struct nlmsghdr *const nlmsghdr,
145 const kernel_ulong_t addr,
146 const kernel_ulong_t len);
149 decode_nlmsgerr(struct tcb *const tcp,
157 if (len < sizeof(err.error)) {
158 printstrn(tcp, addr, len);
162 if (umove_or_printaddr(tcp, addr, &err.error))
166 if (err.error < 0 && (unsigned) -err.error < nerrnos) {
167 tprintf("-%s", errnoent[-err.error]);
169 tprintf("%d", err.error);
172 addr += offsetof(struct nlmsgerr, msg);
173 len -= offsetof(struct nlmsgerr, msg);
177 if (fetch_nlmsghdr(tcp, &err.msg, addr, len)) {
178 decode_nlmsghdr_with_payload(tcp, fd, family,
179 &err.msg, addr, len);
187 decode_payload(struct tcb *const tcp,
190 const struct nlmsghdr *const nlmsghdr,
191 const kernel_ulong_t addr,
192 const kernel_ulong_t len)
194 if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
195 decode_nlmsgerr(tcp, fd, family, addr, len);
197 } else if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
200 if (!umove_or_printaddr(tcp, addr, &num))
205 printstrn(tcp, addr, len);
209 decode_nlmsghdr_with_payload(struct tcb *const tcp,
212 const struct nlmsghdr *const nlmsghdr,
213 const kernel_ulong_t addr,
214 const kernel_ulong_t len)
218 family = print_nlmsghdr(tcp, fd, family, nlmsghdr);
220 unsigned int nlmsg_len =
221 nlmsghdr->nlmsg_len > len ? len : nlmsghdr->nlmsg_len;
222 if (nlmsg_len > NLMSG_HDRLEN) {
224 decode_payload(tcp, fd, family, nlmsghdr, addr + NLMSG_HDRLEN,
225 nlmsg_len - NLMSG_HDRLEN);
232 decode_netlink(struct tcb *const tcp,
237 struct nlmsghdr nlmsghdr;
238 bool print_array = false;
241 for (elt = 0; fetch_nlmsghdr(tcp, &nlmsghdr, addr, len); elt++) {
242 if (abbrev(tcp) && elt == max_strlen) {
247 unsigned int nlmsg_len = NLMSG_ALIGN(nlmsghdr.nlmsg_len);
248 kernel_ulong_t next_addr = 0;
249 kernel_ulong_t next_len = 0;
251 if (nlmsghdr.nlmsg_len >= NLMSG_HDRLEN) {
252 next_len = (len >= nlmsg_len) ? len - nlmsg_len : 0;
254 if (next_len && addr + nlmsg_len > addr)
255 next_addr = addr + nlmsg_len;
258 if (!print_array && next_addr) {
263 decode_nlmsghdr_with_payload(tcp, fd, NL_FAMILY_DEFAULT,
264 &nlmsghdr, addr, len);