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.
32 #include <linux/audit.h>
33 #include <linux/rtnetlink.h>
34 #include <linux/xfrm.h>
35 #include "xlat/netlink_flags.h"
36 #include "xlat/netlink_get_flags.h"
37 #include "xlat/netlink_new_flags.h"
38 #include "xlat/netlink_protocols.h"
39 #include "xlat/netlink_types.h"
40 #include "xlat/nl_audit_types.h"
41 #include "xlat/nl_netfilter_msg_types.h"
42 #include "xlat/nl_netfilter_subsys_ids.h"
43 #include "xlat/nl_route_types.h"
44 #include "xlat/nl_selinux_types.h"
45 #include "xlat/nl_sock_diag_types.h"
46 #include "xlat/nl_xfrm_types.h"
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 decode_nlmsg_type_default(const struct xlat *const xlat,
102 const char *const dflt)
104 printxval(xlat, type, dflt);
108 decode_nlmsg_type_generic(const struct xlat *const xlat,
110 const char *const dflt)
112 printxval(genl_families_xlat(), type, dflt);
116 decode_nlmsg_type_netfilter(const struct xlat *const xlat,
118 const char *const dflt)
120 /* Reserved control nfnetlink messages first. */
121 const char *const text = xlookup(nl_netfilter_msg_types, type);
128 * Other netfilter message types are split
129 * in two pieces: 8 bits subsystem and 8 bits type.
131 const uint8_t subsys_id = (uint8_t) (type >> 8);
132 const uint8_t msg_type = (uint8_t) type;
134 printxval(xlat, subsys_id, dflt);
137 * The type is subsystem specific,
138 * print it in numeric format for now.
140 tprintf("<<8|%#x", msg_type);
143 typedef void (*nlmsg_types_decoder_t)(const struct xlat *,
147 static const struct {
148 const nlmsg_types_decoder_t decoder;
149 const struct xlat *const xlat;
150 const char *const dflt;
152 [NETLINK_AUDIT] = { NULL, nl_audit_types, "AUDIT_???" },
153 [NETLINK_GENERIC] = {
154 decode_nlmsg_type_generic,
158 [NETLINK_NETFILTER] = {
159 decode_nlmsg_type_netfilter,
160 nl_netfilter_subsys_ids,
163 [NETLINK_ROUTE] = { NULL, nl_route_types, "RTM_???" },
164 [NETLINK_SELINUX] = { NULL, nl_selinux_types, "SELNL_MSG_???" },
165 [NETLINK_SOCK_DIAG] = { NULL, nl_sock_diag_types, "SOCK_DIAG_???" },
166 [NETLINK_XFRM] = { NULL, nl_xfrm_types, "XFRM_MSG_???" }
170 * As all valid netlink families are positive integers, use unsigned int
171 * for family here to filter out NL_FAMILY_ERROR and NL_FAMILY_DEFAULT.
174 decode_nlmsg_type(const uint16_t type, const unsigned int family)
176 nlmsg_types_decoder_t decoder = decode_nlmsg_type_default;
177 const struct xlat *xlat = netlink_types;
178 const char *dflt = "NLMSG_???";
180 if (type != NLMSG_DONE && family < ARRAY_SIZE(nlmsg_types)) {
181 if (nlmsg_types[family].decoder)
182 decoder = nlmsg_types[family].decoder;
183 if (nlmsg_types[family].xlat)
184 xlat = nlmsg_types[family].xlat;
185 if (nlmsg_types[family].dflt)
186 dflt = nlmsg_types[family].dflt;
189 decoder(xlat, type, dflt);
193 decode_nlmsg_flags(const uint16_t flags, const uint16_t type, const int family)
195 const struct xlat *table = NULL;
197 if (type == NLMSG_DONE)
201 case NETLINK_SOCK_DIAG:
202 table = netlink_get_flags;
205 if (type == RTM_DELACTION) {
206 table = netlink_get_flags;
211 table = netlink_new_flags;
214 table = netlink_get_flags;
221 case XFRM_MSG_NEWPOLICY:
223 case XFRM_MSG_NEWSADINFO:
224 case XFRM_MSG_NEWSPDINFO:
225 table = netlink_new_flags;
229 case XFRM_MSG_GETPOLICY:
231 case XFRM_MSG_GETSADINFO:
232 case XFRM_MSG_GETSPDINFO:
233 table = netlink_get_flags;
240 printflags_ex(flags, "NLM_F_???", netlink_flags, table, NULL);
244 print_nlmsghdr(struct tcb *tcp,
247 const struct nlmsghdr *const nlmsghdr)
249 /* print the whole structure regardless of its nlmsg_len */
251 tprintf("{len=%u, type=", nlmsghdr->nlmsg_len);
253 const int hdr_family = (nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE
254 && nlmsghdr->nlmsg_type != NLMSG_DONE)
256 : (family != NL_FAMILY_DEFAULT
257 ? family : get_fd_nl_family(tcp, fd));
259 decode_nlmsg_type(nlmsghdr->nlmsg_type, hdr_family);
262 decode_nlmsg_flags(nlmsghdr->nlmsg_flags,
263 nlmsghdr->nlmsg_type, hdr_family);
265 tprintf(", seq=%u, pid=%u}", nlmsghdr->nlmsg_seq,
266 nlmsghdr->nlmsg_pid);
268 return family != NL_FAMILY_DEFAULT ? family : hdr_family;
272 decode_nlmsghdr_with_payload(struct tcb *const tcp,
275 const struct nlmsghdr *const nlmsghdr,
276 const kernel_ulong_t addr,
277 const kernel_ulong_t len);
280 decode_nlmsgerr(struct tcb *const tcp,
288 if (len < sizeof(err.error)) {
289 printstrn(tcp, addr, len);
293 if (umove_or_printaddr(tcp, addr, &err.error))
297 if (err.error < 0 && (unsigned) -err.error < nerrnos) {
298 tprintf("-%s", errnoent[-err.error]);
300 tprintf("%d", err.error);
303 addr += offsetof(struct nlmsgerr, msg);
304 len -= offsetof(struct nlmsgerr, msg);
308 if (fetch_nlmsghdr(tcp, &err.msg, addr, len)) {
309 decode_nlmsghdr_with_payload(tcp, fd, family,
310 &err.msg, addr, len);
317 static const netlink_decoder_t netlink_decoders[] = {
318 [NETLINK_SOCK_DIAG] = decode_netlink_sock_diag
322 decode_payload(struct tcb *const tcp,
325 const struct nlmsghdr *const nlmsghdr,
326 const kernel_ulong_t addr,
327 const kernel_ulong_t len)
329 if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
330 decode_nlmsgerr(tcp, fd, family, addr, len);
334 if ((unsigned int) family < ARRAY_SIZE(netlink_decoders)
335 && netlink_decoders[family]
336 && netlink_decoders[family](tcp, nlmsghdr, addr, len)) {
340 if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
343 if (!umove_or_printaddr(tcp, addr, &num))
348 printstrn(tcp, addr, len);
352 decode_nlmsghdr_with_payload(struct tcb *const tcp,
355 const struct nlmsghdr *const nlmsghdr,
356 const kernel_ulong_t addr,
357 const kernel_ulong_t len)
359 const unsigned int nlmsg_len =
360 nlmsghdr->nlmsg_len > len ? len : nlmsghdr->nlmsg_len;
362 if (nlmsg_len > NLMSG_HDRLEN)
365 family = print_nlmsghdr(tcp, fd, family, nlmsghdr);
367 if (nlmsg_len > NLMSG_HDRLEN) {
369 decode_payload(tcp, fd, family, nlmsghdr, addr + NLMSG_HDRLEN,
370 nlmsg_len - NLMSG_HDRLEN);
376 decode_netlink(struct tcb *const tcp,
381 struct nlmsghdr nlmsghdr;
382 bool print_array = false;
385 for (elt = 0; fetch_nlmsghdr(tcp, &nlmsghdr, addr, len); elt++) {
386 if (abbrev(tcp) && elt == max_strlen) {
391 unsigned int nlmsg_len = NLMSG_ALIGN(nlmsghdr.nlmsg_len);
392 kernel_ulong_t next_addr = 0;
393 kernel_ulong_t next_len = 0;
395 if (nlmsghdr.nlmsg_len >= NLMSG_HDRLEN) {
396 next_len = (len >= nlmsg_len) ? len - nlmsg_len : 0;
398 if (next_len && addr + nlmsg_len > addr)
399 next_addr = addr + nlmsg_len;
402 if (!print_array && next_addr) {
407 decode_nlmsghdr_with_payload(tcp, fd, NL_FAMILY_DEFAULT,
408 &nlmsghdr, addr, len);