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 "xlat/netlink_flags.h"
36 #include "xlat/netlink_protocols.h"
37 #include "xlat/netlink_types.h"
38 #include "xlat/nl_audit_types.h"
39 #include "xlat/nl_route_types.h"
40 #include "xlat/nl_sock_diag_types.h"
43 #define NLMSG_HDRLEN NLMSG_ALIGN(sizeof(struct nlmsghdr))
46 * Fetch a struct nlmsghdr from the given address.
49 fetch_nlmsghdr(struct tcb *const tcp, struct nlmsghdr *const nlmsghdr,
50 const kernel_ulong_t addr, const kernel_ulong_t len)
52 if (len < sizeof(struct nlmsghdr)) {
53 printstrn(tcp, addr, len);
57 if (umove_or_printaddr(tcp, addr, nlmsghdr))
65 NL_FAMILY_DEFAULT = -2
69 get_fd_nl_family(struct tcb *const tcp, const int fd)
71 const unsigned long inode = getfdinode(tcp, fd);
73 return NL_FAMILY_ERROR;
75 const char *const details = get_sockaddr_by_inode(tcp, fd, inode);
77 return NL_FAMILY_ERROR;
79 const char *const nl_details = STR_STRIP_PREFIX(details, "NETLINK:[");
80 if (nl_details == details)
81 return NL_FAMILY_ERROR;
83 const struct xlat *xlats = netlink_protocols;
84 for (; xlats->str; ++xlats) {
85 const char *name = STR_STRIP_PREFIX(xlats->str, "NETLINK_");
86 if (!strncmp(nl_details, name, strlen(name)))
90 if (*nl_details >= '0' && *nl_details <= '9')
91 return atoi(nl_details);
93 return NL_FAMILY_ERROR;
97 const struct xlat *const xlat;
98 const char *const dflt;
100 [NETLINK_AUDIT] = { nl_audit_types, "AUDIT_???" },
101 [NETLINK_ROUTE] = { nl_route_types, "RTM_???" },
102 [NETLINK_SOCK_DIAG] = { nl_sock_diag_types, "SOCK_DIAG_???" }
106 * As all valid netlink families are positive integers, use unsigned int
107 * for family here to filter out NL_FAMILY_ERROR and NL_FAMILY_DEFAULT.
110 decode_nlmsg_type(const uint16_t type, const unsigned int family)
112 if (family < ARRAY_SIZE(nlmsg_types)
113 && nlmsg_types[family].xlat) {
114 printxval(nlmsg_types[family].xlat, type, nlmsg_types[family].dflt);
116 printxval(netlink_types, type, "NLMSG_???");
121 print_nlmsghdr(struct tcb *tcp,
124 const struct nlmsghdr *const nlmsghdr)
126 /* print the whole structure regardless of its nlmsg_len */
128 tprintf("{len=%u, type=", nlmsghdr->nlmsg_len);
130 const int hdr_family = (nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE)
132 : (family != NL_FAMILY_DEFAULT
133 ? family : get_fd_nl_family(tcp, fd));
135 decode_nlmsg_type(nlmsghdr->nlmsg_type, hdr_family);
138 printflags(netlink_flags, nlmsghdr->nlmsg_flags, "NLM_F_???");
140 tprintf(", seq=%u, pid=%u}", nlmsghdr->nlmsg_seq,
141 nlmsghdr->nlmsg_pid);
143 return family != NL_FAMILY_DEFAULT ? family : hdr_family;
147 decode_nlmsghdr_with_payload(struct tcb *const tcp,
150 const struct nlmsghdr *const nlmsghdr,
151 const kernel_ulong_t addr,
152 const kernel_ulong_t len);
155 decode_nlmsgerr(struct tcb *const tcp,
163 if (len < sizeof(err.error)) {
164 printstrn(tcp, addr, len);
168 if (umove_or_printaddr(tcp, addr, &err.error))
172 if (err.error < 0 && (unsigned) -err.error < nerrnos) {
173 tprintf("-%s", errnoent[-err.error]);
175 tprintf("%d", err.error);
178 addr += offsetof(struct nlmsgerr, msg);
179 len -= offsetof(struct nlmsgerr, msg);
183 if (fetch_nlmsghdr(tcp, &err.msg, addr, len)) {
184 decode_nlmsghdr_with_payload(tcp, fd, family,
185 &err.msg, addr, len);
193 decode_payload(struct tcb *const tcp,
196 const struct nlmsghdr *const nlmsghdr,
197 const kernel_ulong_t addr,
198 const kernel_ulong_t len)
200 if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
201 decode_nlmsgerr(tcp, fd, family, addr, len);
203 } else if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
206 if (!umove_or_printaddr(tcp, addr, &num))
211 printstrn(tcp, addr, len);
215 decode_nlmsghdr_with_payload(struct tcb *const tcp,
218 const struct nlmsghdr *const nlmsghdr,
219 const kernel_ulong_t addr,
220 const kernel_ulong_t len)
224 family = print_nlmsghdr(tcp, fd, family, nlmsghdr);
226 unsigned int nlmsg_len =
227 nlmsghdr->nlmsg_len > len ? len : nlmsghdr->nlmsg_len;
228 if (nlmsg_len > NLMSG_HDRLEN) {
230 decode_payload(tcp, fd, family, nlmsghdr, addr + NLMSG_HDRLEN,
231 nlmsg_len - NLMSG_HDRLEN);
238 decode_netlink(struct tcb *const tcp,
243 struct nlmsghdr nlmsghdr;
244 bool print_array = false;
247 for (elt = 0; fetch_nlmsghdr(tcp, &nlmsghdr, addr, len); elt++) {
248 if (abbrev(tcp) && elt == max_strlen) {
253 unsigned int nlmsg_len = NLMSG_ALIGN(nlmsghdr.nlmsg_len);
254 kernel_ulong_t next_addr = 0;
255 kernel_ulong_t next_len = 0;
257 if (nlmsghdr.nlmsg_len >= NLMSG_HDRLEN) {
258 next_len = (len >= nlmsg_len) ? len - nlmsg_len : 0;
260 if (next_len && addr + nlmsg_len > addr)
261 next_addr = addr + nlmsg_len;
264 if (!print_array && next_addr) {
269 decode_nlmsghdr_with_payload(tcp, fd, NL_FAMILY_DEFAULT,
270 &nlmsghdr, addr, len);