netlink_route: implement RTM_NEWCACHEREPORT message decoding

* bundled/linux/include/uapi/linux/mroute.h: New file, copied from
headers_install'ed Linux kernel v5.15.
* bundled/linux/include/uapi/linux/mroute6.h: Likewise.
* bundled/Makefile.am (EXTRA_DIST): Add them.
* src/xlat/rtnl_family.in: New file.
* src/xlat/rtnl_ip6mra_creport_attr.in: Likewise.
* src/xlat/rtnl_ip6mra_msg_types.in: Likewise.
* src/xlat/rtnl_ipmra_creport_attr.in: Likewise.
* src/xlat/rtnl_ipmra_msg_types.in: Likewise.
* src/rtnl_cachereport.c: Likewise.
* src/Makefile.am (strace_SOURCES): Add it.
* src/netlink_route.c (route_decoders) <[RTM_NEWCACHEREPORT - RTM_BASE]>:
New decoder, call decode_cachereport.
* src/netlink_route.h (decode_cachereport): New declaration.
* tests/.gitignore: Add nlattr_cachereport, nlattr_cachereport-Xabbrev,
nlattr_cachereport-Xraw, and nlattr_cachereport-Xverbose.
* tests/pure_executables.list: Likewise.
* tests/netlink_route.c (test_rtnl_rtgen) <types>: Add
RTM_NEWCACHEREPORT.
(test_rtnl_rtgen): Move RTM_NEWCACHEREPORT-related unknown message
checks from...
(main): ...here.  Remove the unsupported message check
for RTM_NEWCACHEREPORT.
* tests/nlattr_cachereport.c: New file.
* tests/nlattr_cachereport-Xabbrev.c: Likewise.
* tests/nlattr_cachereport-Xraw.c: Likewise.
* tests/nlattr_cachereport-Xverbose.c: Likewise.
* tests/gen_tests.in (nlattr_cachereport, nlattr_cachereport-Xabbrev,
nlattr_cachereport-Xraw, nlattr_cachereport-Xverbose): New tests.
* NEWS: Mention it.

1 files changed, 100 insertions, 0 deletions

diff --git a/src/rtnl_cachereport.c b/src/rtnl_cachereport.c
new file mode 100644
index 000000000..ad0c224ce
--- /dev/null
+++ b/src/rtnl_cachereport.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2018-2021 Eugene Syromyatnikov <evgsyr@gmail.com>
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include "defs.h"
+#include "netlink_route.h"
+#include "nlattr.h"
+#include "print_fields.h"
+
+#include "netlink.h"
+#include <linux/mroute.h>
+#include <linux/mroute6.h>
+#include <linux/rtnetlink.h>
+
+#include "xlat/rtnl_ip6mra_creport_attr.h"
+#include "xlat/rtnl_ip6mra_msg_types.h"
+#include "xlat/rtnl_ipmra_creport_attr.h"
+#include "xlat/rtnl_ipmra_msg_types.h"
+#include "xlat/rtnl_family.h"
+
+static bool
+decode_nla_ipmra_msg_type(struct tcb *const tcp,
+			  const kernel_ulong_t addr,
+			  const unsigned int len,
+			  const void *const opaque_data)
+{
+	const struct decode_nla_xlat_opts opts = {
+		.xlat = rtnl_ipmra_msg_types,
+		.dflt = "IGMPMSG_???",
+		.size = 1,
+	};
+
+	return decode_nla_xval(tcp, addr, len, &opts);
+}
+
+static const nla_decoder_t rtnl_creport_ipmra_decoders[] = {
+	[IPMRA_CREPORT_UNSPEC]		= NULL,
+	[IPMRA_CREPORT_MSGTYPE]		= decode_nla_ipmra_msg_type,
+	[IPMRA_CREPORT_VIF_ID]		= decode_nla_u32,
+	[IPMRA_CREPORT_SRC_ADDR]	= decode_nla_in_addr,
+	[IPMRA_CREPORT_DST_ADDR]	= decode_nla_in_addr,
+	[IPMRA_CREPORT_PKT]		= NULL, /* raw packet data */
+	[IPMRA_CREPORT_TABLE]		= decode_nla_u32,
+};
+
+static bool
+decode_nla_ip6mra_msg_type(struct tcb *const tcp,
+			   const kernel_ulong_t addr,
+			   const unsigned int len,
+			   const void *const opaque_data)
+{
+	const struct decode_nla_xlat_opts opts = {
+		.xlat = rtnl_ip6mra_msg_types,
+		.dflt = "MRT6MSG_???",
+		.size = 1,
+	};
+
+	return decode_nla_xval(tcp, addr, len, &opts);
+}
+
+static const nla_decoder_t rtnl_creport_ip6mra_decoders[] = {
+	[IP6MRA_CREPORT_UNSPEC]		= NULL,
+	[IP6MRA_CREPORT_MSGTYPE]	= decode_nla_ip6mra_msg_type,
+	[IP6MRA_CREPORT_MIF_ID]		= decode_nla_u32,
+	[IP6MRA_CREPORT_SRC_ADDR]	= decode_nla_in6_addr,
+	[IP6MRA_CREPORT_DST_ADDR]	= decode_nla_in6_addr,
+	[IP6MRA_CREPORT_PKT]		= NULL, /* raw packet data */
+};
+
+DECL_NETLINK_ROUTE_DECODER(decode_cachereport)
+{
+	static const struct af_spec_decoder_desc cachereport_descs[] = {
+		{ RTNL_FAMILY_IPMR,
+		  rtnl_ipmra_creport_attr, "IPMRA_CREPORT_???",
+		  ARRSZ_PAIR(rtnl_creport_ipmra_decoders) },
+		{ RTNL_FAMILY_IP6MR,
+		  rtnl_ip6mra_creport_attr, "IP6MRA_CREPORT_???",
+		  ARRSZ_PAIR(rtnl_creport_ip6mra_decoders) },
+	};
+
+	struct rtgenmsg rtgenmsg = { .rtgen_family = family };
+
+	tprint_struct_begin();
+	tprints_field_name("rtgen_family");
+	printxvals_ex(rtgenmsg.rtgen_family, "RTNL_FAMILY_???",
+		      XLAT_STYLE_DEFAULT, rtnl_family, addrfams, NULL);
+	tprint_struct_end();
+
+	const size_t offset = NLMSG_ALIGN(sizeof(rtgenmsg));
+
+	if (len > offset) {
+		tprint_array_next();
+		decode_nla_af_spec(tcp, addr + offset, len - offset,
+				   rtgenmsg.rtgen_family,
+				   ARRSZ_PAIR(cachereport_descs));
+	}
+}