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Message-Id: <20210924000413.89902-3-mathew.j.martineau@linux.intel.com>
Date: Thu, 23 Sep 2021 17:04:12 -0700
From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
To: netdev@...r.kernel.org
Cc: Davide Caratti <dcaratti@...hat.com>, davem@...emloft.net,
kuba@...nel.org, matthieu.baerts@...sares.net,
mptcp@...ts.linux.dev, fw@...len.de, pabeni@...hat.com,
geliangtang@...il.com,
Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net 2/2] mptcp: allow changing the 'backup' bit when no sockets are open
From: Davide Caratti <dcaratti@...hat.com>
current Linux refuses to change the 'backup' bit of MPTCP endpoints, i.e.
using MPTCP_PM_CMD_SET_FLAGS, unless it finds (at least) one subflow that
matches the endpoint address. There is no reason for that, so we can just
ignore the return value of mptcp_nl_addr_backup(). In this way, endpoints
can reconfigure their 'backup' flag even if no MPTCP sockets are open (or
more generally, in case the MP_PRIO message is not sent out).
Fixes: 0f9f696a502e ("mptcp: add set_flags command in PM netlink")
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
net/mptcp/pm_netlink.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index c4f9a5ce3815..050eea231528 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1718,9 +1718,7 @@ static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
list_for_each_entry(entry, &pernet->local_addr_list, list) {
if (addresses_equal(&entry->addr, &addr.addr, true)) {
- ret = mptcp_nl_addr_backup(net, &entry->addr, bkup);
- if (ret)
- return ret;
+ mptcp_nl_addr_backup(net, &entry->addr, bkup);
if (bkup)
entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP;
--
2.33.0
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