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_get_flags.h"
38 #include "xlat/netlink_new_flags.h"
39 #include "xlat/netlink_protocols.h"
40 #include "xlat/netlink_types.h"
41 #include "xlat/nl_audit_types.h"
42 #include "xlat/nl_netfilter_msg_types.h"
43 #include "xlat/nl_netfilter_subsys_ids.h"
44 #include "xlat/nl_route_types.h"
45 #include "xlat/nl_selinux_types.h"
46 #include "xlat/nl_sock_diag_types.h"
47 #include "xlat/nl_xfrm_types.h"
50 #define NLMSG_HDRLEN NLMSG_ALIGN(sizeof(struct nlmsghdr))
53 * Fetch a struct nlmsghdr from the given address.
56 fetch_nlmsghdr(struct tcb *const tcp, struct nlmsghdr *const nlmsghdr,
57 const kernel_ulong_t addr, const kernel_ulong_t len)
59 if (len < sizeof(struct nlmsghdr)) {
60 printstrn(tcp, addr, len);
64 if (umove_or_printaddr(tcp, addr, nlmsghdr))
72 NL_FAMILY_DEFAULT = -2
76 get_fd_nl_family(struct tcb *const tcp, const int fd)
78 const unsigned long inode = getfdinode(tcp, fd);
80 return NL_FAMILY_ERROR;
82 const char *const details = get_sockaddr_by_inode(tcp, fd, inode);
84 return NL_FAMILY_ERROR;
86 const char *const nl_details = STR_STRIP_PREFIX(details, "NETLINK:[");
87 if (nl_details == details)
88 return NL_FAMILY_ERROR;
90 const struct xlat *xlats = netlink_protocols;
91 for (; xlats->str; ++xlats) {
92 const char *name = STR_STRIP_PREFIX(xlats->str, "NETLINK_");
93 if (!strncmp(nl_details, name, strlen(name)))
97 if (*nl_details >= '0' && *nl_details <= '9')
98 return atoi(nl_details);
100 return NL_FAMILY_ERROR;
104 decode_nlmsg_type_default(const struct xlat *const xlat,
106 const char *const dflt)
108 printxval(xlat, type, dflt);
112 decode_nlmsg_type_netfilter(const struct xlat *const xlat,
114 const char *const dflt)
116 /* Reserved control nfnetlink messages first. */
117 const char *const text = xlookup(nl_netfilter_msg_types, type);
124 * Other netfilter message types are split
125 * in two pieces: 8 bits subsystem and 8 bits type.
127 const uint8_t subsys_id = (uint8_t) (type >> 8);
128 const uint8_t msg_type = (uint8_t) type;
130 printxval(xlat, subsys_id, dflt);
133 * The type is subsystem specific,
134 * print it in numeric format for now.
136 tprintf("<<8|%#x", msg_type);
139 typedef void (*nlmsg_types_decoder_t)(const struct xlat *,
143 static const struct {
144 const nlmsg_types_decoder_t decoder;
145 const struct xlat *const xlat;
146 const char *const dflt;
148 [NETLINK_AUDIT] = { NULL, nl_audit_types, "AUDIT_???" },
149 [NETLINK_NETFILTER] = {
150 decode_nlmsg_type_netfilter,
151 nl_netfilter_subsys_ids,
154 [NETLINK_ROUTE] = { NULL, nl_route_types, "RTM_???" },
155 [NETLINK_SELINUX] = { NULL, nl_selinux_types, "SELNL_MSG_???" },
156 [NETLINK_SOCK_DIAG] = { NULL, nl_sock_diag_types, "SOCK_DIAG_???" },
157 [NETLINK_XFRM] = { NULL, nl_xfrm_types, "XFRM_MSG_???" }
161 * As all valid netlink families are positive integers, use unsigned int
162 * for family here to filter out NL_FAMILY_ERROR and NL_FAMILY_DEFAULT.
165 decode_nlmsg_type(const uint16_t type, const unsigned int family)
167 nlmsg_types_decoder_t decoder = decode_nlmsg_type_default;
168 const struct xlat *xlat = netlink_types;
169 const char *dflt = "NLMSG_???";
171 if (family < ARRAY_SIZE(nlmsg_types)) {
172 if (nlmsg_types[family].decoder)
173 decoder = nlmsg_types[family].decoder;
174 if (nlmsg_types[family].xlat)
175 xlat = nlmsg_types[family].xlat;
176 if (nlmsg_types[family].dflt)
177 dflt = nlmsg_types[family].dflt;
180 decoder(xlat, type, dflt);
184 decode_nlmsg_flags(const uint16_t flags, const uint16_t type, const int family)
186 const struct xlat *table = NULL;
189 case NETLINK_SOCK_DIAG:
190 table = netlink_get_flags;
193 if (type == RTM_DELACTION) {
194 table = netlink_get_flags;
199 table = netlink_new_flags;
202 table = netlink_get_flags;
209 case XFRM_MSG_NEWPOLICY:
211 case XFRM_MSG_NEWSADINFO:
212 case XFRM_MSG_NEWSPDINFO:
213 table = netlink_new_flags;
217 case XFRM_MSG_GETPOLICY:
219 case XFRM_MSG_GETSADINFO:
220 case XFRM_MSG_GETSPDINFO:
221 table = netlink_get_flags;
227 printflags_ex(flags, "NLM_F_???", netlink_flags, table, NULL);
231 print_nlmsghdr(struct tcb *tcp,
234 const struct nlmsghdr *const nlmsghdr)
236 /* print the whole structure regardless of its nlmsg_len */
238 tprintf("{len=%u, type=", nlmsghdr->nlmsg_len);
240 const int hdr_family = (nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE)
242 : (family != NL_FAMILY_DEFAULT
243 ? family : get_fd_nl_family(tcp, fd));
245 decode_nlmsg_type(nlmsghdr->nlmsg_type, hdr_family);
248 decode_nlmsg_flags(nlmsghdr->nlmsg_flags,
249 nlmsghdr->nlmsg_type, hdr_family);
251 tprintf(", seq=%u, pid=%u}", nlmsghdr->nlmsg_seq,
252 nlmsghdr->nlmsg_pid);
254 return family != NL_FAMILY_DEFAULT ? family : hdr_family;
258 decode_nlmsghdr_with_payload(struct tcb *const tcp,
261 const struct nlmsghdr *const nlmsghdr,
262 const kernel_ulong_t addr,
263 const kernel_ulong_t len);
266 decode_nlmsgerr(struct tcb *const tcp,
274 if (len < sizeof(err.error)) {
275 printstrn(tcp, addr, len);
279 if (umove_or_printaddr(tcp, addr, &err.error))
283 if (err.error < 0 && (unsigned) -err.error < nerrnos) {
284 tprintf("-%s", errnoent[-err.error]);
286 tprintf("%d", err.error);
289 addr += offsetof(struct nlmsgerr, msg);
290 len -= offsetof(struct nlmsgerr, msg);
294 if (fetch_nlmsghdr(tcp, &err.msg, addr, len)) {
295 decode_nlmsghdr_with_payload(tcp, fd, family,
296 &err.msg, addr, len);
304 decode_payload(struct tcb *const tcp,
307 const struct nlmsghdr *const nlmsghdr,
308 const kernel_ulong_t addr,
309 const kernel_ulong_t len)
311 if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
312 decode_nlmsgerr(tcp, fd, family, addr, len);
314 } else if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
317 if (!umove_or_printaddr(tcp, addr, &num))
322 printstrn(tcp, addr, len);
326 decode_nlmsghdr_with_payload(struct tcb *const tcp,
329 const struct nlmsghdr *const nlmsghdr,
330 const kernel_ulong_t addr,
331 const kernel_ulong_t len)
335 family = print_nlmsghdr(tcp, fd, family, nlmsghdr);
337 unsigned int nlmsg_len =
338 nlmsghdr->nlmsg_len > len ? len : nlmsghdr->nlmsg_len;
339 if (nlmsg_len > NLMSG_HDRLEN) {
341 decode_payload(tcp, fd, family, nlmsghdr, addr + NLMSG_HDRLEN,
342 nlmsg_len - NLMSG_HDRLEN);
349 decode_netlink(struct tcb *const tcp,
354 struct nlmsghdr nlmsghdr;
355 bool print_array = false;
358 for (elt = 0; fetch_nlmsghdr(tcp, &nlmsghdr, addr, len); elt++) {
359 if (abbrev(tcp) && elt == max_strlen) {
364 unsigned int nlmsg_len = NLMSG_ALIGN(nlmsghdr.nlmsg_len);
365 kernel_ulong_t next_addr = 0;
366 kernel_ulong_t next_len = 0;
368 if (nlmsghdr.nlmsg_len >= NLMSG_HDRLEN) {
369 next_len = (len >= nlmsg_len) ? len - nlmsg_len : 0;
371 if (next_len && addr + nlmsg_len > addr)
372 next_addr = addr + nlmsg_len;
375 if (!print_array && next_addr) {
380 decode_nlmsghdr_with_payload(tcp, fd, NL_FAMILY_DEFAULT,
381 &nlmsghdr, addr, len);