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From: Gang Yan <yangang@kylinos.cn>
To: mptcp@lists.linux.dev
Cc: Gang Yan <yangang@kylinos.cn>
Subject: [mptcp-next v2 1/2] selftests: mptcp: Add a tool to get specific
msk_info
Date: Thu, 20 Feb 2025 15:11:24 +0800
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This patch enables the retrieval of the mptcp_info structure corresponding
to a specified MPTCP socket (msk). When multiple MPTCP connections are
present, specific information can be obtained for a given connection
through the 'mptcp_diag_dump_one' by using the 'token' associated with
the msk.
Signed-off-by: Gang Yan <yangang@kylinos.cn>
---
tools/testing/selftests/net/mptcp/Makefile | 2 +-
.../testing/selftests/net/mptcp/mptcp_diag.c | 235 ++++++++++++++++++
2 files changed, 236 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/net/mptcp/mptcp_diag.c
diff --git a/tools/testing/selftests/net/mptcp/Makefile b/tools/testing/sel=
ftests/net/mptcp/Makefile
index c76525fe2b84..340e1a777e16 100644
--- a/tools/testing/selftests/net/mptcp/Makefile
+++ b/tools/testing/selftests/net/mptcp/Makefile
@@ -7,7 +7,7 @@ CFLAGS +=3D -Wall -Wl,--no-as-needed -O2 -g -I$(top_srcdir)=
/usr/include $(KHDR_INC
TEST_PROGS :=3D mptcp_connect.sh pm_netlink.sh mptcp_join.sh diag.sh \
simult_flows.sh mptcp_sockopt.sh userspace_pm.sh
=20
-TEST_GEN_FILES =3D mptcp_connect pm_nl_ctl mptcp_sockopt mptcp_inq
+TEST_GEN_FILES =3D mptcp_connect pm_nl_ctl mptcp_sockopt mptcp_inq mptcp_d=
iag
=20
TEST_FILES :=3D mptcp_lib.sh settings
=20
diff --git a/tools/testing/selftests/net/mptcp/mptcp_diag.c b/tools/testing=
/selftests/net/mptcp/mptcp_diag.c
new file mode 100644
index 000000000000..3e0be9e58912
--- /dev/null
+++ b/tools/testing/selftests/net/mptcp/mptcp_diag.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025, Kylin Software*/
+
+#include <linux/sock_diag.h>
+#include <linux/rtnetlink.h>
+#include <linux/inet_diag.h>
+#include <linux/netlink.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <linux/tcp.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+#ifndef IPPROTO_MPTCP
+#define IPPROTO_MPTCP 262
+#endif
+
+#ifndef MPTCP_INFO
+struct mptcp_info {
+ __u8 mptcpi_subflows;
+ __u8 mptcpi_add_addr_signal;
+ __u8 mptcpi_add_addr_accepted;
+ __u8 mptcpi_subflows_max;
+ __u8 mptcpi_add_addr_signal_max;
+ __u8 mptcpi_add_addr_accepted_max;
+ __u32 mptcpi_flags;
+ __u32 mptcpi_token;
+ __u64 mptcpi_write_seq;
+ __u64 mptcpi_snd_una;
+ __u64 mptcpi_rcv_nxt;
+ __u8 mptcpi_local_addr_used;
+ __u8 mptcpi_local_addr_max;
+ __u8 mptcpi_csum_enabled;
+ __u32 mptcpi_retransmits;
+ __u64 mptcpi_bytes_retrans;
+ __u64 mptcpi_bytes_sent;
+ __u64 mptcpi_bytes_received;
+ __u64 mptcpi_bytes_acked;
+};
+
+#define MPTCP_INFO 1
+#endif
+
+static void die_perror(const char *msg)
+{
+ perror(msg);
+ exit(1);
+}
+
+static void die_usage(int r)
+{
+ fprintf(stderr, "Usage: mptcp_diag -t\n");
+ exit(r);
+}
+
+static void send_query(int fd, __u32 token)
+{
+ struct sockaddr_nl nladdr =3D {
+ .nl_family =3D AF_NETLINK
+ };
+ struct {
+ struct nlmsghdr nlh;
+ struct inet_diag_req_v2 r;
+ } req =3D {
+ .nlh =3D {
+ .nlmsg_len =3D sizeof(req),
+ .nlmsg_type =3D SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags =3D NLM_F_REQUEST
+ },
+ .r =3D {
+ .sdiag_family =3D AF_INET,
+ .sdiag_protocol =3D IPPROTO_MPTCP,
+ .id.idiag_cookie[0] =3D token,
+ }
+ };
+ struct rtattr rta_proto;
+ struct iovec iov[6];
+ int iovlen =3D 1;
+ __u32 proto;
+
+ req.r.idiag_ext |=3D (1 << (INET_DIAG_INFO - 1));
+ proto =3D IPPROTO_MPTCP;
+ rta_proto.rta_type =3D INET_DIAG_REQ_PROTOCOL;
+ rta_proto.rta_len =3D RTA_LENGTH(sizeof(proto));
+
+ iov[0] =3D (struct iovec) {
+ .iov_base =3D &req,
+ .iov_len =3D sizeof(req)
+ };
+ iov[iovlen] =3D (struct iovec){ &rta_proto, sizeof(rta_proto)};
+ iov[iovlen + 1] =3D (struct iovec){ &proto, sizeof(proto)};
+ req.nlh.nlmsg_len +=3D RTA_LENGTH(sizeof(proto));
+ iovlen +=3D 2;
+ struct msghdr msg =3D {
+ .msg_name =3D &nladdr,
+ .msg_namelen =3D sizeof(nladdr),
+ .msg_iov =3D iov,
+ .msg_iovlen =3D iovlen
+ };
+
+ for (;;) {
+ if (sendmsg(fd, &msg, 0) < 0) {
+ if (errno =3D=3D EINTR)
+ continue;
+ die_perror("sendmsg");
+ }
+ break;
+ }
+}
+
+static void parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr=
*rta,
+ int len, unsigned short flags)
+{
+ unsigned short type;
+
+ memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
+ while (RTA_OK(rta, len)) {
+ type =3D rta->rta_type & ~flags;
+ if ((type <=3D max) && (!tb[type]))
+ tb[type] =3D rta;
+ rta =3D RTA_NEXT(rta, len);
+ }
+}
+
+static struct mptcp_info *parse_nlmsg(struct nlmsghdr *nlh)
+{
+ struct inet_diag_msg *r =3D NLMSG_DATA(nlh);
+ struct rtattr *tb[INET_DIAG_MAX+1];
+ struct mptcp_info *info;
+
+ parse_rtattr_flags(tb, INET_DIAG_MAX, (struct rtattr *)(r+1),
+ nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)),
+ NLA_F_NESTED);
+
+ if (tb[INET_DIAG_INFO]) {
+ info =3D RTA_DATA(tb[INET_DIAG_INFO]);
+ return info;
+ }
+
+ die_perror("Has no INET_DIAG_INFO");
+ return info;
+}
+
+static struct mptcp_info *recv_nlmsg(int fd, struct nlmsghdr *nlh)
+{
+ char rcv_buff[8192];
+ struct sockaddr_nl rcv_nladdr =3D {
+ .nl_family =3D AF_NETLINK
+ };
+ struct iovec rcv_iov =3D {
+ .iov_base =3D rcv_buff,
+ .iov_len =3D sizeof(rcv_buff)
+ };
+ struct msghdr rcv_msg =3D {
+ .msg_name =3D &rcv_nladdr,
+ .msg_namelen =3D sizeof(rcv_nladdr),
+ .msg_iov =3D &rcv_iov,
+ .msg_iovlen =3D 1
+ };
+ struct mptcp_info *info =3D NULL;
+ int len;
+
+ len =3D recvmsg(fd, &rcv_msg, 0);
+ nlh =3D (struct nlmsghdr *)rcv_buff;
+
+ while (NLMSG_OK(nlh, len)) {
+ if (nlh->nlmsg_type =3D=3D NLMSG_DONE) {
+ printf("NLMSG_DONE\n");
+ break;
+ } else if (nlh->nlmsg_type =3D=3D NLMSG_ERROR) {
+ struct nlmsgerr *err;
+
+ err =3D (struct nlmsgerr *)NLMSG_DATA(nlh);
+ printf("Error %d:%s\n", -(err->error), strerror(-(err->error)));
+ break;
+ }
+ info =3D parse_nlmsg(nlh);
+ nlh =3D NLMSG_NEXT(nlh, len);
+ }
+ close(fd);
+ return info;
+}
+
+static struct mptcp_info *get_mptcpinfo(__u32 token)
+{
+ struct nlmsghdr *nlh =3D NULL;
+ int fd;
+
+ fd =3D socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
+ if (fd < 0)
+ die_perror("Netlink socket");
+
+ send_query(fd, token);
+ return recv_nlmsg(fd, nlh);
+}
+
+static void parse_opts(int argc, char **argv, __u32 *target_token)
+{
+ int c;
+
+ while ((c =3D getopt(argc, argv, "ht:")) !=3D -1) {
+ switch (c) {
+ case 'h':
+ die_usage(1);
+ break;
+ case 't':
+ sscanf(optarg, "%x", target_token);
+ break;
+ default:
+ die_usage(1);
+ break;
+ }
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ struct mptcp_info *info =3D NULL;
+ __u32 target_token;
+
+ parse_opts(argc, argv, &target_token);
+ info =3D get_mptcpinfo(target_token);
+
+ if (info)
+ printf("token:%x\n", info->mptcpi_token);
+ else
+ perror("No Such msk using this token!\n");
+
+ return 0;
+}
+
--=20
2.43.0
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From: Gang Yan <yangang@kylinos.cn>
To: mptcp@lists.linux.dev
Cc: Gang Yan <yangang@kylinos.cn>
Subject: [mptcp-next v2 2/2] selftests: mptcp: add a test for
mptcp_diag_dump_one
Date: Thu, 20 Feb 2025 15:11:25 +0800
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<bf32d17ddef19059b2806a041a9ea322ecd1977a.1740035000.git.yangang@kylinos.cn>
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This patch introduces a new 'chk_diag' test in diag.sh. It retrieves
the token for a specified MPTCP socket (msk) using the 'ss' command and
then accesses the 'mptcp_diag_dump_one' in kernel via ./mptcp_diag
to verify if the correct token is returned.
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/524
Signed-off-by: Gang Yan <yangang@kylinos.cn>
---
tools/testing/selftests/net/mptcp/diag.sh | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/self=
tests/net/mptcp/diag.sh
index 2bd0c1eb70c5..9a57c27b14b9 100755
--- a/tools/testing/selftests/net/mptcp/diag.sh
+++ b/tools/testing/selftests/net/mptcp/diag.sh
@@ -200,6 +200,28 @@ chk_msk_cestab()
"${expected}" "${msg}" ""
}
=20
+chk_dumpone()
+{
+ local ss_token=3D"$(ss -inmHMN $ns | grep 'token:' |\
+ head -n 1 |\
+ sed 's/.*token:\([0-9a-f]*\).*/\1/')"
+ local token=3D"$(ip netns exec $ns ./mptcp_diag -t $ss_token |\
+ grep 'token:' |\
+ sed 's/.*token:\([0-9a-f]*\).*/\1/')"
+ local msg=3D"...chk dumpone"
+
+ mptcp_lib_print_title "$msg"
+ if [ "$ss_token" !=3D "$token" ]; then
+ mptcp_lib_pr_fail "expected $ss_token found $token"
+ mptcp_lib_result_fail "${msg}"
+ ret=3D${KSFT_FAIL}
+ else
+ mptcp_lib_pr_ok
+ mptcp_lib_result_pass "${msg}"
+ fi
+
+}
+
msk_info_get_value()
{
local port=3D"${1}"
@@ -290,6 +312,7 @@ chk_msk_remote_key_nr 2 "....chk remote_key"
chk_msk_fallback_nr 0 "....chk no fallback"
chk_msk_inuse 2
chk_msk_cestab 2
+chk_dumpone
flush_pids
=20
chk_msk_inuse 0 "2->0"
--=20
2.43.0