tests: check decoding of netlink inet_diag_msg attributes

* tests/nlattr_inet_diag_msg.c: New file.
* tests/gen_tests.in (nlattr_inet_diag_msg): New entry.
* tests/pure_executables.list: Add nlattr_inet_diag_msg.
* tests/.gitignore: Likewise.

1 files changed, 602 insertions, 0 deletions

diff --git a/tests/nlattr_inet_diag_msg.c b/tests/nlattr_inet_diag_msg.c
new file mode 100644
index 000000000..dd0c46cc1
--- /dev/null
+++ b/tests/nlattr_inet_diag_msg.c
@@ -0,0 +1,602 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
+ * Copyright (c) 2017 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 "netlink.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <linux/inet_diag.h>
+#include <linux/rtnetlink.h>
+#include <linux/sock_diag.h>
+
+static void
+init_inet_diag_msg(struct nlmsghdr *nlh, unsigned int msg_len,
+		   const char *address)
+{
+	struct inet_diag_msg *msg;
+
+	SET_STRUCT(struct nlmsghdr, nlh,
+		.nlmsg_len = msg_len,
+		.nlmsg_type = SOCK_DIAG_BY_FAMILY,
+		.nlmsg_flags = NLM_F_DUMP
+	);
+
+	msg = NLMSG_DATA(nlh);
+	SET_STRUCT(struct inet_diag_msg, msg,
+		.idiag_family = AF_INET,
+		.idiag_state = TCP_LISTEN
+	);
+
+	if (!inet_pton(AF_INET, address, msg->id.idiag_src) ||
+	    !inet_pton(AF_INET, address, msg->id.idiag_dst))
+		perror_msg_and_skip("inet_pton");
+}
+
+static void
+test_inet_diag_meminfo(const int fd)
+{
+	const int hdrlen = sizeof(struct inet_diag_msg);
+	const char address[] = "87.65.43.21";
+	struct nlmsghdr *nlh;
+	struct nlattr *nla;
+	unsigned int nla_len;
+	unsigned int msg_len;
+	void *const nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+	long rc;
+
+	/* len < sizeof(struct inet_diag_meminfo) */
+	nla_len = NLA_HDRLEN + 2;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_MEMINFO
+	);
+	memcpy(RTA_DATA(nla), "12", 2);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_MEMINFO}"
+	       ", \"12\"}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       msg_len, sprintrc(rc));
+
+	/* short read of inet_diag_meminfo */
+	nla_len = NLA_HDRLEN + sizeof(struct inet_diag_meminfo);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - (nla_len - 1);
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_MEMINFO
+	);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_MEMINFO}"
+	       ", %p}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       RTA_DATA(nla), msg_len, sprintrc(rc));
+
+	/* inet_diag_meminfo */
+	nla_len = NLA_HDRLEN + sizeof(struct inet_diag_meminfo);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_MEMINFO
+	);
+	static const struct inet_diag_meminfo minfo = {
+		.idiag_rmem = 0xfadcacdb,
+		.idiag_wmem = 0xbdabcada,
+		.idiag_fmem = 0xbadbfafb,
+		.idiag_tmem = 0xfdacdadf
+	};
+	memcpy(RTA_DATA(nla), &minfo, sizeof(minfo));
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_MEMINFO}"
+	       ", {idiag_rmem=%u, idiag_wmem=%u, idiag_fmem=%u, idiag_tmem=%u}}}"
+	       ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       minfo.idiag_rmem, minfo.idiag_wmem,
+	       minfo.idiag_fmem, minfo.idiag_tmem,
+	       msg_len, sprintrc(rc));
+}
+
+static void
+test_inet_diag_vegasinfo(const int fd)
+{
+	const int hdrlen = sizeof(struct inet_diag_msg);
+	const char address[] = "87.65.43.21";
+	struct nlmsghdr *nlh;
+	struct nlattr *nla;
+	unsigned int nla_len;
+	unsigned int msg_len;
+	void *const nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+	long rc;
+
+	/* len < sizeof(struct tcpvegas_info) */
+	nla_len = NLA_HDRLEN + 2;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_VEGASINFO
+	);
+	memcpy(RTA_DATA(nla), "12", 2);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_VEGASINFO}"
+	       ", \"12\"}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       msg_len, sprintrc(rc));
+
+	/* short read of tcpvegas_info */
+	nla_len = NLA_HDRLEN + sizeof(struct tcpvegas_info);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - (nla_len - 1);
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_VEGASINFO
+	);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_VEGASINFO}"
+	       ", %p}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       RTA_DATA(nla), msg_len, sprintrc(rc));
+
+	/* tcpvegas_info */
+	nla_len = NLA_HDRLEN + sizeof(struct tcpvegas_info);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_VEGASINFO
+	);
+	static const struct tcpvegas_info vegas = {
+		.tcpv_enabled = 0xfadcacdb,
+		.tcpv_rttcnt = 0xbdabcada,
+		.tcpv_rtt = 0xbadbfafb,
+		.tcpv_minrtt = 0xfdacdadf
+	};
+	memcpy(RTA_DATA(nla), &vegas, sizeof(vegas));
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_VEGASINFO}"
+	       ", {tcpv_enabled=%u, tcpv_rttcnt=%u, tcpv_rtt=%u"
+	       ", tcpv_minrtt=%u}}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       vegas.tcpv_enabled, vegas.tcpv_rttcnt,
+	       vegas.tcpv_rtt, vegas.tcpv_minrtt,
+	       msg_len, sprintrc(rc));
+}
+
+static void
+test_inet_diag_skmeminfo(const int fd)
+{
+	const int hdrlen = sizeof(struct inet_diag_msg);
+	const char address[] = "87.65.43.21";
+	struct nlmsghdr *nlh;
+	struct nlattr *nla;
+	unsigned int nla_len;
+	unsigned int msg_len;
+	void *const nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+	long rc;
+
+	/* len < sizeof(uint32_t) */
+	nla_len = NLA_HDRLEN + 2;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_SKMEMINFO
+	);
+	memcpy(RTA_DATA(nla), "12", 2);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u"
+	       ", nla_type=INET_DIAG_SKMEMINFO}, \"12\"}}"
+	       ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       msg_len, sprintrc(rc));
+
+	/* len = sizeof(uint32_t) * 2 - 1 */
+	nla_len = NLA_HDRLEN + sizeof(uint32_t) * 2 - 1;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_SKMEMINFO
+	);
+	static const uint32_t mem[] = { 0xaffacbad, 0xffadbcab };
+	memcpy(RTA_DATA(nla), mem, sizeof(mem[0]));
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_SKMEMINFO}"
+	       ", [%u]}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       mem[0], msg_len, sprintrc(rc));
+
+	/* len = sizeof(uint32_t) * 2 */
+	nla_len = NLA_HDRLEN + sizeof(uint32_t) * 2;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_SKMEMINFO
+	);
+	memcpy(RTA_DATA(nla), mem, sizeof(mem));
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_SKMEMINFO}"
+	       ", [%u, %u]}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       mem[0], mem[1], msg_len, sprintrc(rc));
+}
+
+static void
+test_inet_diag_dctcpinfo(const int fd)
+{
+	const int hdrlen = sizeof(struct inet_diag_msg);
+	const char address[] = "87.65.43.21";
+	struct nlmsghdr *nlh;
+	struct nlattr *nla;
+	unsigned int nla_len;
+	unsigned int msg_len;
+	void *const nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+	long rc;
+
+	/* len < sizeof(struct tcp_dctcp_info) */
+	nla_len = NLA_HDRLEN + 2;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_DCTCPINFO
+	);
+	memcpy(RTA_DATA(nla), "12", 2);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_DCTCPINFO}"
+	       ", \"12\"}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       msg_len, sprintrc(rc));
+
+	/* short read of tcp_dctcp_info */
+	nla_len = NLA_HDRLEN + sizeof(struct tcp_dctcp_info);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - (nla_len - 1);
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_DCTCPINFO
+	);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_DCTCPINFO}"
+	       ", %p}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       RTA_DATA(nla), msg_len, sprintrc(rc));
+
+	/* tcp_dctcp_info */
+	nla_len = NLA_HDRLEN + sizeof(struct tcp_dctcp_info);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_DCTCPINFO
+	);
+	static const struct tcp_dctcp_info dctcp = {
+		.dctcp_enabled = 0xfdac,
+		.dctcp_ce_state = 0xfadc,
+		.dctcp_alpha = 0xbdabcada,
+		.dctcp_ab_ecn = 0xbadbfafb,
+		.dctcp_ab_tot = 0xfdacdadf
+	};
+	memcpy(RTA_DATA(nla), &dctcp, sizeof(dctcp));
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_DCTCPINFO}"
+	       ", {dctcp_enabled=%u, dctcp_ce_state=%u"
+	       ", dctcp_alpha=%u, dctcp_ab_ecn=%u, dctcp_ab_tot=%u}}}"
+	       ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       dctcp.dctcp_enabled, dctcp.dctcp_ce_state,
+	       dctcp.dctcp_alpha, dctcp.dctcp_ab_ecn,
+	       dctcp.dctcp_ab_tot, msg_len, sprintrc(rc));
+}
+
+static void
+test_inet_diag_bbrinfo(const int fd)
+{
+	const int hdrlen = sizeof(struct inet_diag_msg);
+	const char address[] = "12.34.56.78";
+	struct nlmsghdr *nlh;
+	struct nlattr *nla;
+	unsigned int nla_len;
+	unsigned int msg_len;
+	void *const nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+	long rc;
+
+	/* len < sizeof(struct tcp_bbr_info) */
+	nla_len = NLA_HDRLEN + 2;
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_BBRINFO
+	);
+	memcpy(RTA_DATA(nla), "12", 2);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_BBRINFO}"
+	       ", \"12\"}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       msg_len, sprintrc(rc));
+
+	/* short read of tcp_bbr_info */
+	nla_len = NLA_HDRLEN + sizeof(struct tcp_bbr_info);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - (nla_len - 1);
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_BBRINFO
+	);
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_BBRINFO}"
+	       ", %p}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       RTA_DATA(nla), msg_len, sprintrc(rc));
+
+	/* tcp_bbr_info */
+	nla_len = NLA_HDRLEN + sizeof(struct tcp_bbr_info);
+	msg_len = NLMSG_SPACE(hdrlen) + nla_len;
+	nlh = nlh0 - nla_len;
+	init_inet_diag_msg(nlh, msg_len, address);
+
+	nla = NLMSG_ATTR(nlh, hdrlen);
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = nla_len,
+		.nla_type = INET_DIAG_BBRINFO
+	);
+	static const struct tcp_bbr_info bbr = {
+		.bbr_bw_lo = 0xfdacdadf,
+		.bbr_bw_hi = 0xfadcacdb,
+		.bbr_min_rtt = 0xbdabcada,
+		.bbr_pacing_gain = 0xbadbfafb,
+		.bbr_cwnd_gain = 0xfdacdadf
+	};
+	memcpy(RTA_DATA(nla), &bbr, sizeof(bbr));
+
+	rc = sendto(fd, nlh, msg_len, MSG_DONTWAIT, NULL, 0);
+
+	printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
+	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {idiag_family=AF_INET"
+	       ", idiag_state=TCP_LISTEN, idiag_timer=0, idiag_retrans=0"
+	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_src)"
+	       ", inet_pton(AF_INET, \"%s\", &idiag_dst)"
+	       ", idiag_if=0, idiag_cookie=[0, 0]}, idiag_expires=0"
+	       ", idiag_rqueue=0, idiag_wqueue=0, idiag_uid=0"
+	       ", idiag_inode=0}, {{nla_len=%u, nla_type=INET_DIAG_BBRINFO}"
+	       ", {bbr_bw_lo=%#x, bbr_bw_hi=%#x, bbr_min_rtt=%u"
+	       ", bbr_pacing_gain=%u, bbr_cwnd_gain=%u}}}"
+	       ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, msg_len, address, address, nla_len,
+	       bbr.bbr_bw_lo, bbr.bbr_bw_hi, bbr.bbr_min_rtt,
+	       bbr.bbr_pacing_gain, bbr.bbr_cwnd_gain,
+	       msg_len, sprintrc(rc));
+}
+
+int main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	int fd = create_nl_socket(NETLINK_SOCK_DIAG);
+
+	test_inet_diag_meminfo(fd);
+	test_inet_diag_vegasinfo(fd);
+	test_inet_diag_skmeminfo(fd);
+	test_inet_diag_dctcpinfo(fd);
+	test_inet_diag_bbrinfo(fd);
+
+	printf("+++ exited with 0 +++\n");
+
+	return 0;
+}