tests: check decoding of IFLA_AF_SPEC netlink attribute

* configure.ac (AC_CHECK_TYPES): Check for struct ifla_cacheinfo in
<linux/rtnetlink.h>
(AC_CHECK_DECLS): Check for IFLA_AF_SPEC in <linux/rtnetlink.h>.
* tests/nlattr_ifla_af_spec.c: New file.
* tests/pure_executables.list: Add nlattr_ifla_af_spec.
* tests/.gitignore: Likewise.
* tests/gen_tests.in (nlattr_ifla_af_spec): New test.

5 files changed, 325 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index dc887abed..ed22a720e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -507,6 +507,7 @@ AC_CHECK_TYPES(m4_normalize([
 
 AC_CHECK_TYPES(m4_normalize([
 	struct ifla_bridge_id,
+	struct ifla_cacheinfo,
 	struct ifla_port_vsi,
 	struct rtnl_link_stats64
 ]),,, [#include <sys/socket.h>
@@ -519,6 +520,7 @@ AC_CHECK_MEMBERS(m4_normalize([
 AC_CHECK_DECLS(m4_normalize([
 	IFLA_PORT_SELF,
 	IFLA_PROTINFO,
+	IFLA_AF_SPEC,
 	IFLA_XDP
 ]),,, [#include <sys/socket.h>
 #include <linux/rtnetlink.h>])
diff --git a/tests/.gitignore b/tests/.gitignore
index a754f7886..4c5fd7fab 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -287,6 +287,7 @@ nlattr_fib_rule_hdr
 nlattr_ifaddrlblmsg
 nlattr_ifaddrmsg
 nlattr_ifinfomsg
+nlattr_ifla_af_spec
 nlattr_ifla_brport
 nlattr_ifla_port
 nlattr_ifla_xdp
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index f3518d198..9d6c00bea 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -262,6 +262,7 @@ nlattr_fib_rule_hdr		+netlink_sock_diag.test
 nlattr_ifaddrlblmsg		+netlink_sock_diag.test
 nlattr_ifaddrmsg		+netlink_sock_diag.test
 nlattr_ifinfomsg		+netlink_sock_diag.test
+nlattr_ifla_af_spec		+netlink_sock_diag.test
 nlattr_ifla_brport		+netlink_sock_diag.test
 nlattr_ifla_port		+netlink_sock_diag.test
 nlattr_ifla_xdp			+netlink_sock_diag.test
diff --git a/tests/nlattr_ifla_af_spec.c b/tests/nlattr_ifla_af_spec.c
new file mode 100644
index 000000000..287e0817f
--- /dev/null
+++ b/tests/nlattr_ifla_af_spec.c
@@ -0,0 +1,320 @@
+/*
+ * IFLA_AF_SPEC netlink attribute decoding check.
+ *
+ * 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 "tests.h"
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stddef.h>
+#include "test_nlattr.h"
+
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#ifdef HAVE_LINUX_IF_LINK_H
+# include <linux/if_link.h>
+#endif
+#include <linux/rtnetlink.h>
+
+#if !HAVE_DECL_IFLA_AF_SPEC
+enum { IFLA_AF_SPEC = 26 };
+#endif
+
+#define XLAT_MACROS_ONLY
+# include "xlat/rtnl_ifla_af_spec_inet_attrs.h"
+# include "xlat/rtnl_ifla_af_spec_inet6_attrs.h"
+#undef XLAT_MACROS_ONLY
+
+#ifndef HAVE_STRUCT_IFLA_CACHEINFO
+struct ifla_cacheinfo {
+	uint32_t max_reasm_len;
+	uint32_t tstamp;
+	uint32_t reachable_time;
+	uint32_t retrans_time;
+};
+#endif
+
+#define IFLA_ATTR IFLA_AF_SPEC
+#include "nlattr_ifla.h"
+
+#define AF_SPEC_FUNCS(family_)						\
+	static void							\
+	init_##family_##_msg(struct nlmsghdr *const nlh,		\
+			     const unsigned int msg_len)		\
+	{								\
+		init_ifinfomsg(nlh, msg_len);				\
+									\
+		struct nlattr *nla = NLMSG_ATTR(nlh, hdrlen);		\
+		nla += 1;						\
+		SET_STRUCT(struct nlattr, nla,				\
+			.nla_len = msg_len - NLMSG_SPACE(hdrlen)	\
+				  - NLA_HDRLEN,				\
+			.nla_type = family_,				\
+		);							\
+	}								\
+									\
+	static void							\
+	print_##family_##_msg(const unsigned int msg_len)		\
+	{								\
+		print_ifinfomsg(msg_len);				\
+		printf(", {{nla_len=%u, nla_type=" #family_ "}",	\
+		       msg_len - NLMSG_SPACE(hdrlen) - NLA_HDRLEN);	\
+	}								\
+	/* end of AF_SPEC_FUNCS definition */
+
+AF_SPEC_FUNCS(AF_INET)
+AF_SPEC_FUNCS(AF_INET6)
+
+static void
+print_arr_val(uint32_t *val, size_t idx, const char *idx_str)
+{
+	if (idx_str)
+		printf("[%s] = ", idx_str);
+	else
+		printf("[%zu] = ", idx);
+
+	printf("%d", *val);
+}
+
+static void
+print_arr_uval(uint64_t *val, size_t idx, const char *idx_str)
+{
+	if (idx_str)
+		printf("[%s] = ", idx_str);
+	else
+		printf("[%zu] = ", idx);
+
+	printf("%" PRIu64, *val);
+}
+
+static void
+print_inet_conf_val(uint32_t *val, size_t idx)
+{
+	static const char * const strs[] = {
+		"IPV4_DEVCONF_FORWARDING-1",
+		"IPV4_DEVCONF_MC_FORWARDING-1",
+	};
+
+	print_arr_val(val, idx, idx < ARRAY_SIZE(strs) ? strs[idx] : NULL);
+}
+
+
+static void
+print_inet6_conf_val(uint32_t *val, size_t idx)
+{
+	static const char * const strs[] = {
+		"DEVCONF_FORWARDING",
+		"DEVCONF_HOPLIMIT",
+	};
+
+	print_arr_val(val, idx, idx < ARRAY_SIZE(strs) ? strs[idx] : NULL);
+}
+
+static void
+print_inet6_stats_val(uint64_t *val, size_t idx)
+{
+	static const char * const strs[] = {
+		"IPSTATS_MIB_NUM",
+		"IPSTATS_MIB_INPKTS",
+	};
+
+	print_arr_uval(val, idx, idx < ARRAY_SIZE(strs) ? strs[idx] : NULL);
+}
+
+static void
+print_icmp6_stats_val(uint64_t *val, size_t idx)
+{
+	static const char * const strs[] = {
+		"ICMP6_MIB_NUM",
+		"ICMP6_MIB_INMSGS",
+		"ICMP6_MIB_INERRORS",
+		"ICMP6_MIB_OUTMSGS",
+		"ICMP6_MIB_OUTERRORS",
+		"ICMP6_MIB_CSUMERRORS",
+		"6 /* ICMP6_MIB_??? */",
+	};
+
+	print_arr_uval(val, idx, idx < ARRAY_SIZE(strs) ? strs[idx] : NULL);
+}
+
+int
+main(void)
+{
+	static const uint8_t unknown_msg[] = { 0xab, 0xac, 0xdb, 0xcd };
+
+	skip_if_unavailable("/proc/self/fd/");
+
+	const int fd = create_nl_socket(NETLINK_ROUTE);
+
+	const unsigned int hdrlen = sizeof(struct ifinfomsg);
+	void *nlh0 = midtail_alloc(NLMSG_SPACE(hdrlen), 3 * NLA_HDRLEN + 256);
+
+	static char pattern[4096];
+	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
+
+
+	/* unknown AF_* */
+	TEST_NESTED_NLATTR_OBJECT(fd, nlh0, hdrlen,
+				  init_ifinfomsg, print_ifinfomsg,
+				  AF_UNIX, pattern, unknown_msg,
+				  printf("\"\\xab\\xac\\xdb\\xcd\""));
+
+	/* AF_INET */
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET_msg, print_AF_INET_msg,
+				      0, "IFLA_INET_UNSPEC", pattern,
+				      unknown_msg, 2,
+				      printf("\"\\xab\\xac\\xdb\\xcd\""));
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET_msg, print_AF_INET_msg,
+				      2, "0x2 /* IFLA_INET_??? */", pattern,
+				      unknown_msg, 2,
+				      printf("\"\\xab\\xac\\xdb\\xcd\""));
+
+	/* AF_INET: IFLA_INET_CONF */
+	uint32_t inet_conf_vals[] = { 0xdeadc0de, 0xda7aface };
+	TEST_NESTED_NLATTR_ARRAY_EX(fd, nlh0, hdrlen,
+				    init_AF_INET_msg, print_AF_INET_msg,
+				    IFLA_INET_CONF, pattern,
+				    inet_conf_vals, 2, print_inet_conf_val);
+
+	/* AF_INET6 */
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET6_msg, print_AF_INET6_msg,
+				      0, "IFLA_INET6_UNSPEC", pattern,
+				      unknown_msg, 2,
+				      printf("\"\\xab\\xac\\xdb\\xcd\""));
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET6_msg, print_AF_INET6_msg,
+				      9, "0x9 /* IFLA_INET6_??? */", pattern,
+				      unknown_msg, 2,
+				      printf("\"\\xab\\xac\\xdb\\xcd\""));
+
+	/* AF_INET6: IFLA_INET6_FLAGS */
+	static const struct {
+		uint32_t flags;
+		const char *str;
+	} inet6_flags[] = {
+		{ 0xf, "0xf /* IF_??? */" },
+		{ 0x10, "IF_RS_SENT" },
+		{ 0xc0, "IF_RA_MANAGED|IF_RA_OTHERCONF" },
+		{ 0xdeadc0de, "IF_RS_SENT|IF_RA_MANAGED|IF_RA_OTHERCONF"
+			      "|IF_READY|0x5eadc00e" },
+	};
+
+	for (size_t i = 0; i < ARRAY_SIZE(inet6_flags); i++) {
+		TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+					      init_AF_INET6_msg,
+					      print_AF_INET6_msg,
+					      1, "IFLA_INET6_FLAGS", pattern,
+					      inet6_flags[i].flags, 2,
+					      printf("%s", inet6_flags[i].str));
+	}
+
+	/* AF_INET6: IFLA_INET6_CONF */
+	uint32_t inet6_conf_vals[] = { 0xdeadc0de, 0xda7aface };
+	TEST_NESTED_NLATTR_ARRAY_EX(fd, nlh0, hdrlen,
+				    init_AF_INET6_msg, print_AF_INET6_msg,
+				    IFLA_INET6_CONF, pattern,
+				    inet6_conf_vals, 2, print_inet6_conf_val);
+
+	/* AF_INET6: IFLA_INET6_STATS */
+	uint64_t inet6_stats_vals[] = { 0xdeadc0deda7aface, 0xdec0deedbadc0ded };
+	TEST_NESTED_NLATTR_ARRAY_EX(fd, nlh0, hdrlen,
+				    init_AF_INET6_msg, print_AF_INET6_msg,
+				    IFLA_INET6_STATS, pattern,
+				    inet6_stats_vals, 2, print_inet6_stats_val);
+
+	/* AF_INET6: IFLA_INET6_MCAST */
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET6_msg, print_AF_INET6_msg,
+				      4, "IFLA_INET6_MCAST", pattern,
+				      unknown_msg, 2,
+				      printf("\"\\xab\\xac\\xdb\\xcd\""));
+
+	/* AF_INET6: IFLA_INET6_CACHEINFO */
+	static const struct ifla_cacheinfo ci = {
+		0xbadc0ded, 0xfacebeef, 0xdecafeed, 0xdeadfeed,
+	};
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET6_msg, print_AF_INET6_msg,
+				      5, "IFLA_INET6_CACHEINFO", pattern,
+				      ci, 2,
+				      PRINT_FIELD_U("{", ci, max_reasm_len);
+				      PRINT_FIELD_U(", ", ci, tstamp);
+				      PRINT_FIELD_U(", ", ci, reachable_time);
+				      PRINT_FIELD_U(", ", ci, retrans_time);
+				      printf("}"));
+
+	/* AF_INET6: IFLA_INET6_ICMP6STATS */
+	uint64_t icmp6_stats_vals[] = {
+		0xdeadc0deda7aface, 0xdec0deedbadc0ded, 0xfacebeefdeadfeed,
+		0xdeadc0deda7afacd, 0xdec0deedbadc0dee, 0xfacebeefdeadfeef,
+		0xdeadc0deda7afacc
+	};
+	TEST_NESTED_NLATTR_ARRAY_EX(fd, nlh0, hdrlen,
+				    init_AF_INET6_msg, print_AF_INET6_msg,
+				    IFLA_INET6_ICMP6STATS, pattern,
+				    icmp6_stats_vals, 2, print_icmp6_stats_val);
+
+	/* AF_INET6: IFLA_INET6_TOKEN */
+	uint8_t inet6_addr[16] = {
+		0xba, 0xdc, 0x0d, 0xed, 0xfa, 0xce, 0xbe, 0xef,
+		0xde, 0xca, 0xfe, 0xed, 0xde, 0xad, 0xfe, 0xed,
+	};
+	TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+				      init_AF_INET6_msg, print_AF_INET6_msg,
+				      7, "IFLA_INET6_TOKEN", pattern,
+				      inet6_addr, 2,
+				      printf("badc:ded:face:beef:deca:feed"
+					     ":dead:feed"));
+
+	/* AF_INET6: IFLA_INET6_ */
+	static const struct {
+		uint8_t flags;
+		const char *str;
+	} agms[] = {
+		{ 0x0, "IN6_ADDR_GEN_MODE_EUI64" },
+		{ 0x3, "IN6_ADDR_GEN_MODE_RANDOM" },
+		{ 0x4, "0x4 /* IN6_ADDR_GEN_MODE_??? */" },
+		{ 0xff, "0xff /* IN6_ADDR_GEN_MODE_??? */" },
+	};
+
+	for (size_t i = 0; i < ARRAY_SIZE(agms); i++) {
+		TEST_NESTED_NLATTR_OBJECT_EX_(fd, nlh0, hdrlen,
+					      init_AF_INET6_msg,
+					      print_AF_INET6_msg,
+					      8, "IFLA_INET6_ADDR_GEN_MODE",
+					      pattern, agms[i].flags, 2,
+					      printf("%s", agms[i].str));
+	}
+
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index df84fe669..dea26745f 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -238,6 +238,7 @@ nlattr_fib_rule_hdr
 nlattr_ifaddrlblmsg
 nlattr_ifaddrmsg
 nlattr_ifinfomsg
+nlattr_ifla_af_spec
 nlattr_ifla_brport
 nlattr_ifla_port
 nlattr_ifla_xdp