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.
33 #include <linux/audit.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/xfrm.h>
36 #include "xlat/netlink_ack_flags.h"
37 #include "xlat/netlink_flags.h"
38 #include "xlat/netlink_get_flags.h"
39 #include "xlat/netlink_new_flags.h"
40 #include "xlat/netlink_protocols.h"
41 #include "xlat/netlink_types.h"
42 #include "xlat/nl_audit_types.h"
43 #include "xlat/nl_crypto_types.h"
44 #include "xlat/nl_netfilter_msg_types.h"
45 #include "xlat/nl_netfilter_subsys_ids.h"
46 #include "xlat/nl_selinux_types.h"
47 #include "xlat/nl_sock_diag_types.h"
48 #include "xlat/nl_xfrm_types.h"
49 #include "xlat/nlmsgerr_attrs.h"
52 * Fetch a struct nlmsghdr from the given address.
55 fetch_nlmsghdr(struct tcb *const tcp, struct nlmsghdr *const nlmsghdr,
56 const kernel_ulong_t addr, const kernel_ulong_t len)
58 if (len < sizeof(struct nlmsghdr)) {
59 printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
63 if (umove_or_printaddr(tcp, addr, nlmsghdr))
70 get_fd_nl_family(struct tcb *const tcp, const int fd)
72 const unsigned long inode = getfdinode(tcp, fd);
76 const char *const details = get_sockaddr_by_inode(tcp, fd, inode);
80 const char *const nl_details = STR_STRIP_PREFIX(details, "NETLINK:[");
81 if (nl_details == details)
84 const struct xlat *xlats = netlink_protocols;
85 for (; xlats->str; ++xlats) {
86 const char *name = STR_STRIP_PREFIX(xlats->str, "NETLINK_");
87 if (!strncmp(nl_details, name, strlen(name)))
91 if (*nl_details >= '0' && *nl_details <= '9')
92 return atoi(nl_details);
98 decode_nlmsg_type_default(const struct xlat *const xlat,
100 const char *const dflt)
102 printxval(xlat, type, dflt);
106 decode_nlmsg_type_generic(const struct xlat *const xlat,
108 const char *const dflt)
110 printxval(genl_families_xlat(), type, dflt);
114 decode_nlmsg_type_netfilter(const struct xlat *const xlat,
116 const char *const dflt)
118 /* Reserved control nfnetlink messages first. */
119 const char *const text = xlookup(nl_netfilter_msg_types, type);
126 * Other netfilter message types are split
127 * in two pieces: 8 bits subsystem and 8 bits type.
129 const uint8_t subsys_id = (uint8_t) (type >> 8);
130 const uint8_t msg_type = (uint8_t) type;
132 printxval(xlat, subsys_id, dflt);
135 * The type is subsystem specific,
136 * print it in numeric format for now.
138 tprintf("<<8|%#x", msg_type);
141 typedef void (*nlmsg_types_decoder_t)(const struct xlat *,
145 static const struct {
146 const nlmsg_types_decoder_t decoder;
147 const struct xlat *const xlat;
148 const char *const dflt;
150 [NETLINK_AUDIT] = { NULL, nl_audit_types, "AUDIT_???" },
151 [NETLINK_CRYPTO] = { NULL, nl_crypto_types, "CRYPTO_MSG_???" },
152 [NETLINK_GENERIC] = {
153 decode_nlmsg_type_generic,
157 [NETLINK_NETFILTER] = {
158 decode_nlmsg_type_netfilter,
159 nl_netfilter_subsys_ids,
162 [NETLINK_ROUTE] = { NULL, nl_route_types, "RTM_???" },
163 [NETLINK_SELINUX] = { NULL, nl_selinux_types, "SELNL_MSG_???" },
164 [NETLINK_SOCK_DIAG] = { NULL, nl_sock_diag_types, "SOCK_DIAG_???" },
165 [NETLINK_XFRM] = { NULL, nl_xfrm_types, "XFRM_MSG_???" }
169 * As all valid netlink families are positive integers, use unsigned int
170 * for family here to filter out -1.
173 decode_nlmsg_type(const uint16_t type, const unsigned int family)
175 nlmsg_types_decoder_t decoder = decode_nlmsg_type_default;
176 const struct xlat *xlat = netlink_types;
177 const char *dflt = "NLMSG_???";
180 * type < NLMSG_MIN_TYPE are reserved control messages
181 * that need no family-specific decoding.
183 if (type >= NLMSG_MIN_TYPE && family < ARRAY_SIZE(nlmsg_types)) {
184 if (nlmsg_types[family].decoder)
185 decoder = nlmsg_types[family].decoder;
186 if (nlmsg_types[family].xlat)
187 xlat = nlmsg_types[family].xlat;
188 if (nlmsg_types[family].dflt)
189 dflt = nlmsg_types[family].dflt;
192 decoder(xlat, type, dflt);
196 decode_nlmsg_flags(const uint16_t flags, const uint16_t type, const int family)
198 const struct xlat *table = NULL;
200 if (type < NLMSG_MIN_TYPE) {
201 if (type == NLMSG_ERROR)
202 table = netlink_ack_flags;
209 case CRYPTO_MSG_NEWALG:
210 table = netlink_new_flags;
212 case CRYPTO_MSG_GETALG:
213 table = netlink_get_flags;
217 case NETLINK_SOCK_DIAG:
218 table = netlink_get_flags;
221 if (type == RTM_DELACTION) {
222 table = netlink_get_flags;
227 table = netlink_new_flags;
230 table = netlink_get_flags;
237 case XFRM_MSG_NEWPOLICY:
239 case XFRM_MSG_NEWSADINFO:
240 case XFRM_MSG_NEWSPDINFO:
241 table = netlink_new_flags;
245 case XFRM_MSG_GETPOLICY:
247 case XFRM_MSG_GETSADINFO:
248 case XFRM_MSG_GETSPDINFO:
249 table = netlink_get_flags;
256 printflags_ex(flags, "NLM_F_???", netlink_flags, table, NULL);
260 print_nlmsghdr(struct tcb *tcp,
263 const struct nlmsghdr *const nlmsghdr)
265 /* print the whole structure regardless of its nlmsg_len */
267 tprintf("{len=%u, type=", nlmsghdr->nlmsg_len);
269 decode_nlmsg_type(nlmsghdr->nlmsg_type, family);
272 decode_nlmsg_flags(nlmsghdr->nlmsg_flags,
273 nlmsghdr->nlmsg_type, family);
275 tprintf(", seq=%u, pid=%u}", nlmsghdr->nlmsg_seq,
276 nlmsghdr->nlmsg_pid);
280 print_cookie(struct tcb *const tcp, void *const elem_buf,
281 const size_t elem_size, void *const opaque_data)
283 tprintf("%" PRIu8, *(uint8_t *) elem_buf);
289 decode_nlmsgerr_attr_cookie(struct tcb *const tcp,
290 const kernel_ulong_t addr,
291 const unsigned int len,
292 const void *const opaque_data)
295 const size_t nmemb = len / sizeof(cookie);
297 print_array(tcp, addr, nmemb, &cookie, sizeof(cookie),
298 umoven_or_printaddr, print_cookie, 0);
303 static const nla_decoder_t nlmsgerr_nla_decoders[] = {
304 [NLMSGERR_ATTR_MSG] = decode_nla_str,
305 [NLMSGERR_ATTR_OFFS] = decode_nla_u32,
306 [NLMSGERR_ATTR_COOKIE] = decode_nlmsgerr_attr_cookie
310 decode_nlmsghdr_with_payload(struct tcb *const tcp,
313 const struct nlmsghdr *const nlmsghdr,
314 const kernel_ulong_t addr,
315 const kernel_ulong_t len);
318 decode_nlmsgerr(struct tcb *const tcp,
327 if (len < sizeof(err.error)) {
328 printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
332 if (umove_or_printaddr(tcp, addr, &err.error))
336 if (err.error < 0 && (unsigned) -err.error < nerrnos) {
337 tprintf("-%s", errnoent[-err.error]);
339 tprintf("%d", err.error);
342 addr += offsetof(struct nlmsgerr, msg);
343 len -= offsetof(struct nlmsgerr, msg);
347 if (fetch_nlmsghdr(tcp, &err.msg, addr, len)) {
348 unsigned int payload =
349 capped ? sizeof(err.msg) : err.msg.nlmsg_len;
353 decode_nlmsghdr_with_payload(tcp, fd, family,
354 &err.msg, addr, payload);
357 decode_nlattr(tcp, addr + payload,
358 len - payload, nlmsgerr_attrs,
360 nlmsgerr_nla_decoders,
361 ARRAY_SIZE(nlmsgerr_nla_decoders),
370 static const netlink_decoder_t netlink_decoders[] = {
371 #ifdef HAVE_LINUX_CRYPTOUSER_H
372 [NETLINK_CRYPTO] = decode_netlink_crypto,
374 [NETLINK_ROUTE] = decode_netlink_route,
375 [NETLINK_SELINUX] = decode_netlink_selinux,
376 [NETLINK_SOCK_DIAG] = decode_netlink_sock_diag
380 decode_payload(struct tcb *const tcp,
383 const struct nlmsghdr *const nlmsghdr,
384 const kernel_ulong_t addr,
385 const unsigned int len)
387 if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
388 decode_nlmsgerr(tcp, fd, family, addr, len,
389 nlmsghdr->nlmsg_flags & NLM_F_CAPPED);
394 * While most of NLMSG_DONE messages indeed have payloads
395 * containing just a single integer, there are few exceptions,
396 * so pass payloads of NLMSG_DONE messages to family-specific
397 * netlink payload decoders.
399 * Other types of reserved control messages need no family-specific
400 * netlink payload decoding.
402 if ((nlmsghdr->nlmsg_type >= NLMSG_MIN_TYPE
403 || nlmsghdr->nlmsg_type == NLMSG_DONE)
404 && (unsigned int) family < ARRAY_SIZE(netlink_decoders)
405 && netlink_decoders[family]
406 && netlink_decoders[family](tcp, nlmsghdr, addr, len)) {
410 if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
413 if (!umove_or_printaddr(tcp, addr, &num))
418 printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
422 decode_nlmsghdr_with_payload(struct tcb *const tcp,
425 const struct nlmsghdr *const nlmsghdr,
426 const kernel_ulong_t addr,
427 const kernel_ulong_t len)
429 const unsigned int nlmsg_len =
430 nlmsghdr->nlmsg_len > len ? len : nlmsghdr->nlmsg_len;
432 if (nlmsg_len > NLMSG_HDRLEN)
435 print_nlmsghdr(tcp, fd, family, nlmsghdr);
437 if (nlmsg_len > NLMSG_HDRLEN) {
439 decode_payload(tcp, fd, family, nlmsghdr, addr + NLMSG_HDRLEN,
440 nlmsg_len - NLMSG_HDRLEN);
446 decode_netlink(struct tcb *const tcp,
451 const int family = get_fd_nl_family(tcp, fd);
453 if (family == NETLINK_KOBJECT_UEVENT) {
454 printstrn(tcp, addr, len);
458 struct nlmsghdr nlmsghdr;
459 bool print_array = false;
462 for (elt = 0; fetch_nlmsghdr(tcp, &nlmsghdr, addr, len); elt++) {
463 if (abbrev(tcp) && elt == max_strlen) {
468 unsigned int nlmsg_len = NLMSG_ALIGN(nlmsghdr.nlmsg_len);
469 kernel_ulong_t next_addr = 0;
470 kernel_ulong_t next_len = 0;
472 if (nlmsghdr.nlmsg_len >= NLMSG_HDRLEN) {
473 next_len = (len >= nlmsg_len) ? len - nlmsg_len : 0;
475 if (next_len && addr + nlmsg_len > addr)
476 next_addr = addr + nlmsg_len;
479 if (!print_array && next_addr) {
484 decode_nlmsghdr_with_payload(tcp, fd, family,
485 &nlmsghdr, addr, len);