* netlink_netfilter.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (decode_netlink_netfilter): New prototype.
* netlink.c (netlink_decoders): Add NETLINK_NETFILTER.
* xlat/netfilter_versions.in: New file.
---
Makefile.am | 1 +
defs.h | 1 +
netlink.c | 3 ++
netlink_netfilter.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++
xlat/netfilter_versions.in | 2 ++
5 files changed, 95 insertions(+)
create mode 100644 netlink_netfilter.c
create mode 100644 xlat/netfilter_versions.in
diff --git a/Makefile.am b/Makefile.am
index 2515876..358afc1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -196,6 +196,7 @@ strace_SOURCES = \
netlink_crypto.c \
netlink_sock_diag.h \
netlink_inet_diag.c \
+ netlink_netfilter.c \
netlink_netlink_diag.c \
netlink_packet_diag.c \
netlink_route.c \
diff --git a/defs.h b/defs.h
index 3e42908..6b51626 100644
--- a/defs.h
+++ b/defs.h
@@ -699,6 +699,7 @@ decode_netlink_ ## name(struct tcb *, const struct nlmsghdr
*, \
/* End of DECL_NETLINK definition. */
DECL_NETLINK(crypto);
+DECL_NETLINK(netfilter);
DECL_NETLINK(route);
DECL_NETLINK(selinux);
DECL_NETLINK(sock_diag);
diff --git a/netlink.c b/netlink.c
index beb6ea4..f5fa1f1 100644
--- a/netlink.c
+++ b/netlink.c
@@ -549,6 +549,9 @@ static const netlink_decoder_t netlink_decoders[] = {
#ifdef HAVE_LINUX_CRYPTOUSER_H
[NETLINK_CRYPTO] = decode_netlink_crypto,
#endif
+#ifdef HAVE_LINUX_NETFILTER_NFNETLINK_H
+ [NETLINK_NETFILTER] = decode_netlink_netfilter,
+#endif
[NETLINK_ROUTE] = decode_netlink_route,
[NETLINK_SELINUX] = decode_netlink_selinux,
[NETLINK_SOCK_DIAG] = decode_netlink_sock_diag
diff --git a/netlink_netfilter.c b/netlink_netfilter.c
new file mode 100644
index 0000000..a5efeb6
--- /dev/null
+++ b/netlink_netfilter.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2018 Chen Jingpiao <chenjingp...@gmail.com>
+ * Copyright (c) 2018 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "defs.h"
+
+#ifdef HAVE_LINUX_NETFILTER_NFNETLINK_H
+
+# include "print_fields.h"
+
+# include <netinet/in.h>
+# include <arpa/inet.h>
+# include "netlink.h"
+# include <linux/netfilter/nfnetlink.h>
+
+# include "xlat/netfilter_versions.h"
+# include "xlat/nl_netfilter_subsys_ids.h"
+
+bool
+decode_netlink_netfilter(struct tcb *const tcp,
+ const struct nlmsghdr *const nlmsghdr,
+ const kernel_ulong_t addr,
+ const unsigned int len)
+{
+ if (nlmsghdr->nlmsg_type == NLMSG_DONE)
+ return false;
+
+ struct nfgenmsg nfmsg;
+
+ if (len < sizeof(nfmsg))
+ printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
+ else if (!umove_or_printaddr(tcp, addr, &nfmsg)) {
+ const uint8_t subsys_id = (uint8_t) (nlmsghdr->nlmsg_type >> 8);
+ uint16_t res_id = ntohs(nfmsg.res_id);
+
+ PRINT_FIELD_XVAL("{", nfmsg, nfgen_family, addrfams, "AF_???");
+ PRINT_FIELD_XVAL(", ", nfmsg, version, netfilter_versions,
+ "NFNETLINK_???");
+ tprints(", res_id=");
+ if (subsys_id == NFNL_SUBSYS_NFTABLES
+ && nfmsg.res_id == NFNL_SUBSYS_NFTABLES)
+ tprints("NFNL_SUBSYS_NFTABLES");
+ else {
+ tprints("htons(");
+ if (subsys_id == NFNL_SUBSYS_NFTABLES
+ && res_id == NFNL_SUBSYS_NFTABLES)
+ tprints("NFNL_SUBSYS_NFTABLES");
+ else
+ tprintf("%d", res_id);
+ tprints(")");
+ }
+
+ const size_t offset = NLMSG_ALIGN(sizeof(nfmsg));
+ if (len > offset) {
+ tprints(", ");
+ printstr_ex(tcp, addr + offset,
+ len - offset, QUOTE_FORCE_HEX);
+ }
+ }
+
+ return true;
+}
+
+#endif /* HAVE_LINUX_NETFILTER_NFNETLINK_H */
diff --git a/xlat/netfilter_versions.in b/xlat/netfilter_versions.in
new file mode 100644
index 0000000..da6cd05
--- /dev/null
+++ b/xlat/netfilter_versions.in
@@ -0,0 +1,2 @@
+NFNETLINK_V0
+NFNETLINK_V1
--
2.7.4
------------------------------------------------------------------------------
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