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From: Mat Martineau <mathew.j.martineau@linux.intel.com>
To: netdev@vger.kernel.org
Cc: Mat Martineau <mathew.j.martineau@linux.intel.com>,
	davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com,
	matthieu.baerts@tessares.net, mptcp@lists.linux.dev
Subject: [PATCH net-next 4/6] mptcp: Make kernel path manager check for userspace-managed sockets
Date: Wed, 27 Apr 2022 15:50:00 -0700	[thread overview]
Message-ID: <20220427225002.231996-5-mathew.j.martineau@linux.intel.com> (raw)
In-Reply-To: <20220427225002.231996-1-mathew.j.martineau@linux.intel.com>

Userspace-managed sockets should not have their subflows or
advertisements changed by the kernel path manager.

v3: Use helper function for PM mode (Paolo Abeni)

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
---
 net/mptcp/pm_netlink.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index bbbbfb421eec..473e5aa7baf4 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1220,7 +1220,8 @@ static int mptcp_nl_add_subflow_or_signal_addr(struct net *net)
 	while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
 		struct sock *sk = (struct sock *)msk;
 
-		if (!READ_ONCE(msk->fully_established))
+		if (!READ_ONCE(msk->fully_established) ||
+		    mptcp_pm_is_userspace(msk))
 			goto next;
 
 		lock_sock(sk);
@@ -1363,6 +1364,9 @@ static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net,
 		struct sock *sk = (struct sock *)msk;
 		bool remove_subflow;
 
+		if (mptcp_pm_is_userspace(msk))
+			goto next;
+
 		if (list_empty(&msk->conn_list)) {
 			mptcp_pm_remove_anno_addr(msk, addr, false);
 			goto next;
@@ -1397,7 +1401,7 @@ static int mptcp_nl_remove_id_zero_address(struct net *net,
 		struct sock *sk = (struct sock *)msk;
 		struct mptcp_addr_info msk_local;
 
-		if (list_empty(&msk->conn_list))
+		if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
 			goto next;
 
 		local_address((struct sock_common *)msk, &msk_local);
@@ -1504,9 +1508,11 @@ static void mptcp_nl_remove_addrs_list(struct net *net,
 	while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
 		struct sock *sk = (struct sock *)msk;
 
-		lock_sock(sk);
-		mptcp_pm_remove_addrs_and_subflows(msk, rm_list);
-		release_sock(sk);
+		if (!mptcp_pm_is_userspace(msk)) {
+			lock_sock(sk);
+			mptcp_pm_remove_addrs_and_subflows(msk, rm_list);
+			release_sock(sk);
+		}
 
 		sock_put(sk);
 		cond_resched();
@@ -1779,7 +1785,7 @@ static int mptcp_nl_set_flags(struct net *net,
 	while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
 		struct sock *sk = (struct sock *)msk;
 
-		if (list_empty(&msk->conn_list))
+		if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
 			goto next;
 
 		lock_sock(sk);
-- 
2.36.0


  parent reply	other threads:[~2022-04-27 22:50 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-27 22:49 [PATCH net-next 0/6] mptcp: Path manager mode selection Mat Martineau
2022-04-27 22:49 ` [PATCH net-next 1/6] mptcp: Remove redundant assignments in path manager init Mat Martineau
2022-04-27 22:49 ` [PATCH net-next 2/6] mptcp: Add a member to mptcp_pm_data to track kernel vs userspace mode Mat Martineau
2022-04-27 22:49 ` [PATCH net-next 3/6] mptcp: Bypass kernel PM when userspace PM is enabled Mat Martineau
2022-04-27 22:50 ` Mat Martineau [this message]
2022-04-27 22:50 ` [PATCH net-next 5/6] mptcp: Add a per-namespace sysctl to set the default path manager type Mat Martineau
2022-04-27 22:50 ` [PATCH net-next 6/6] selftests: mptcp: Add tests for userspace PM type Mat Martineau
2022-04-29  1:57 ` [PATCH net-next 0/6] mptcp: Path manager mode selection Jakub Kicinski
2022-04-29  3:39   ` Mat Martineau
2022-04-30  0:51     ` Jakub Kicinski
2022-04-30  1:00 ` patchwork-bot+netdevbpf

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