netdev - [PATCH iproute2-next v3 1/3] mptcp: add fullmesh check for adding address

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Date:   Wed, 23 Feb 2022 14:50:37 +0800
From:   Geliang Tang <geliang.tang@...e.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        David Ahern <dsahern@...nel.org>
CC:     Geliang Tang <geliang.tang@...e.com>, netdev@...r.kernel.org,
        mptcp@...ts.linux.dev,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH iproute2-next v3 1/3] mptcp: add fullmesh check for adding address

The fullmesh flag mustn't be used with the signal flag when adding an
address. Commands like this should be treated as invalid commands:

 ip mptcp endpoint add 10.0.2.1 signal fullmesh

This patch added the necessary flags check for this case.

Acked-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Signed-off-by: Geliang Tang <geliang.tang@...e.com>
---
 ip/ipmptcp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ip/ipmptcp.c b/ip/ipmptcp.c
index eef7c6f4..5682c7df 100644
--- a/ip/ipmptcp.c
+++ b/ip/ipmptcp.c
@@ -116,6 +116,11 @@ static int mptcp_parse_opt(int argc, char **argv, struct nlmsghdr *n, int cmd)
 	ll_init_map(&rth);
 	while (argc > 0) {
 		if (get_flags(*argv, &flags) == 0) {
+			if (adding &&
+			    (flags & MPTCP_PM_ADDR_FLAG_SIGNAL) &&
+			    (flags & MPTCP_PM_ADDR_FLAG_FULLMESH))
+				invarg("flags mustn't have both signal and fullmesh", *argv);
+
 			/* allow changing the 'backup' flag only */
 			if (cmd == MPTCP_PM_CMD_SET_FLAGS &&
 			    (flags & ~MPTCP_PM_ADDR_FLAG_BACKUP))
-- 
2.34.1