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Message-Id: <20240819-net-mptcp-pm-reusing-id-v1-11-38035d40de5b@kernel.org>
Date: Mon, 19 Aug 2024 21:45:29 +0200
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
Geliang Tang <geliang@...nel.org>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
"Matthieu Baerts (NGI0)" <matttbe@...nel.org>, stable@...r.kernel.org
Subject: [PATCH net 11/14] mptcp: pm: only in-kernel cannot have entries
with ID 0
The ID 0 is specific per MPTCP connections. The per netns entries cannot
have this special ID 0 then.
But that's different for the userspace PM where the entries are per
connection, they can then use this special ID 0.
Fixes: f40be0db0b76 ("mptcp: unify pm get_flags_and_ifindex_by_id")
Cc: stable@...r.kernel.org
Acked-by: Geliang Tang <geliang@...nel.org>
Reviewed-by: Mat Martineau <martineau@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
net/mptcp/pm.c | 3 ---
net/mptcp/pm_netlink.c | 4 ++++
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index 925123e99889..3e6e0f5510bb 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -434,9 +434,6 @@ int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id
*flags = 0;
*ifindex = 0;
- if (!id)
- return 0;
-
if (mptcp_pm_is_userspace(msk))
return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk, id, flags, ifindex);
return mptcp_pm_nl_get_flags_and_ifindex_by_id(msk, id, flags, ifindex);
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 28a9a3726146..d0a80f537fc3 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1395,6 +1395,10 @@ int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int
struct sock *sk = (struct sock *)msk;
struct net *net = sock_net(sk);
+ /* No entries with ID 0 */
+ if (id == 0)
+ return 0;
+
rcu_read_lock();
entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
if (entry) {
--
2.45.2
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