From: Geliang Tang <tanggeliang@kylinos.cn>

Add '-m' option to support TCP_MD5SIG tests. Accepts MD5 keys in
'md5,key=<value>' or 'md5ext,prefixlen,ifindex,key' format.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../testing/selftests/net/mptcp/mptcp_sockopt.c  | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c
index 286164f7246e..fcf1d7a195d1 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c
@@ -27,6 +27,10 @@
 #include <linux/tcp.h>
 
 static int pf = AF_INET;
+static bool md5;
+static char key[TCP_MD5SIG_MAXKEYLEN];
+static int prefixlen;
+static int ifindex;
 
 #ifndef IPPROTO_MPTCP
 #define IPPROTO_MPTCP 262
@@ -135,7 +139,7 @@ static void die_perror(const char *msg)
 
 static void die_usage(int r)
 {
-	fprintf(stderr, "Usage: mptcp_sockopt [-6]\n");
+	fprintf(stderr, "Usage: mptcp_sockopt [-6] [-m md5,key|md5ext,prefixlen,ifindex,key]\n");
 	exit(r);
 }
 
@@ -263,7 +267,7 @@ static void parse_opts(int argc, char **argv)
 {
 	int c;
 
-	while ((c = getopt(argc, argv, "h6")) != -1) {
+	while ((c = getopt(argc, argv, "h6m:")) != -1) {
 		switch (c) {
 		case 'h':
 			die_usage(0);
@@ -271,6 +275,14 @@ static void parse_opts(int argc, char **argv)
 		case '6':
 			pf = AF_INET6;
 			break;
+		case 'm':
+			md5 = true;
+			if (!strncmp(optarg, "md5,", 4))
+				sscanf(optarg, "md5,key=%s", key);
+			else if (!strncmp(optarg, "md5ext,", 6))
+				sscanf(optarg, "md5ext,prefixlen=%u,ifindex=%u,key=%s",
+				       &prefixlen, &ifindex, key);
+			break;
 		default:
 			die_usage(1);
 			break;
-- 
2.43.0