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authorMat Martineau <mathew.j.martineau@linux.intel.com>2022-07-05 14:32:12 -0700
committerDavid S. Miller <davem@davemloft.net>2022-07-06 12:50:26 +0100
commitc21b50d5912b68c4414c60ef5b30416c103f9fd8 (patch)
treed2fce0d2ddd4ba453076c27f9cd9dfc398d15576 /net/mptcp
parent5ccecaec5c1e85cabfda848c6f146da0d8d55bd6 (diff)
mptcp: Avoid acquiring PM lock for subflow priority changes
The in-kernel path manager code for changing subflow flags acquired both the msk socket lock and the PM lock when possibly changing the "backup" and "fullmesh" flags. mptcp_pm_nl_mp_prio_send_ack() does not access anything protected by the PM lock, and it must release and reacquire the PM lock. By pushing the PM lock to where it is needed in mptcp_pm_nl_fullmesh(), the lock is only acquired when the fullmesh flag is changed and the backup flag code no longer has to release and reacquire the PM lock. The change in locking context requires the MIB update to be modified - move that to a better location instead. This change also makes it possible to call mptcp_pm_nl_mp_prio_send_ack() for the userspace PM commands without manipulating the in-kernel PM lock. Fixes: 0f9f696a502e ("mptcp: add set_flags command in PM netlink") Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/options.c3
-rw-r--r--net/mptcp/pm_netlink.c8
2 files changed, 5 insertions, 6 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index aead331866a0..bd8f0f425be4 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1584,6 +1584,9 @@ mp_rst:
*ptr++ = mptcp_option(MPTCPOPT_MP_PRIO,
TCPOLEN_MPTCP_PRIO,
opts->backup, TCPOPT_NOP);
+
+ MPTCP_INC_STATS(sock_net((const struct sock *)tp),
+ MPTCP_MIB_MPPRIOTX);
}
mp_capable_done:
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index e099f2a12504..5ff93b73f33d 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -727,7 +727,6 @@ static int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
- struct sock *sk = (struct sock *)msk;
struct mptcp_addr_info local;
local_address((struct sock_common *)ssk, &local);
@@ -739,12 +738,9 @@ static int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
subflow->backup = bkup;
subflow->send_mp_prio = 1;
subflow->request_bkup = bkup;
- __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX);
- spin_unlock_bh(&msk->pm.lock);
pr_debug("send ack for mp_prio");
mptcp_subflow_send_ack(ssk);
- spin_lock_bh(&msk->pm.lock);
return 0;
}
@@ -1816,8 +1812,10 @@ static void mptcp_pm_nl_fullmesh(struct mptcp_sock *msk,
list.ids[list.nr++] = addr->id;
+ spin_lock_bh(&msk->pm.lock);
mptcp_pm_nl_rm_subflow_received(msk, &list);
mptcp_pm_create_subflow_or_signal_addr(msk);
+ spin_unlock_bh(&msk->pm.lock);
}
static int mptcp_nl_set_flags(struct net *net,
@@ -1835,12 +1833,10 @@ static int mptcp_nl_set_flags(struct net *net,
goto next;
lock_sock(sk);
- spin_lock_bh(&msk->pm.lock);
if (changed & MPTCP_PM_ADDR_FLAG_BACKUP)
ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup);
if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH)
mptcp_pm_nl_fullmesh(msk, addr);
- spin_unlock_bh(&msk->pm.lock);
release_sock(sk);
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