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authorPaolo Abeni <pabeni@redhat.com>2020-10-09 19:00:01 +0200
committerJakub Kicinski <kuba@kernel.org>2020-10-10 11:04:53 -0700
commit0e4f35d7880157ceccf0a58377d778b02762af82 (patch)
tree6160e37cd56d5a28940c4e18f00eade5f9489fc0 /net/mptcp
parentd582484726c4c46c8580923e855665fb91e3463e (diff)
downloadlinux-0e4f35d7880157ceccf0a58377d778b02762af82.tar.bz2
mptcp: subflows garbage collection
The msk can close MP_JOIN subflows if the initial handshake fails. Currently such subflows are kept alive in the conn_list until the msk itself is closed. Beyond the wasted memory, we could end-up sending the DATA_FIN and the DATA_FIN ack on such socket, even after a reset. Fixes: 43b54c6ee382 ("mptcp: Use full MPTCP-level disconnect state machine") Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/protocol.c17
-rw-r--r--net/mptcp/protocol.h1
-rw-r--r--net/mptcp/subflow.c6
3 files changed, 24 insertions, 0 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 5d747c6a610e..b295eb6e9580 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1383,6 +1383,20 @@ static void pm_work(struct mptcp_sock *msk)
spin_unlock_bh(&msk->pm.lock);
}
+static void __mptcp_close_subflow(struct mptcp_sock *msk)
+{
+ struct mptcp_subflow_context *subflow, *tmp;
+
+ list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) {
+ struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+
+ if (inet_sk_state_load(ssk) != TCP_CLOSE)
+ continue;
+
+ __mptcp_close_ssk((struct sock *)msk, ssk, subflow, 0);
+ }
+}
+
static void mptcp_worker(struct work_struct *work)
{
struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work);
@@ -1400,6 +1414,9 @@ static void mptcp_worker(struct work_struct *work)
mptcp_clean_una(sk);
mptcp_check_data_fin_ack(sk);
__mptcp_flush_join_list(msk);
+ if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags))
+ __mptcp_close_subflow(msk);
+
__mptcp_move_skbs(msk);
if (msk->pm.status)
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index a26b33556e9b..972463642690 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -90,6 +90,7 @@
#define MPTCP_WORK_RTX 2
#define MPTCP_WORK_EOF 3
#define MPTCP_FALLBACK_DONE 4
+#define MPTCP_WORK_CLOSE_SUBFLOW 5
struct mptcp_options_received {
u64 sndr_key;
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 298bcfdd05f1..559f5bbd9622 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -272,9 +272,15 @@ static bool subflow_thmac_valid(struct mptcp_subflow_context *subflow)
void mptcp_subflow_reset(struct sock *ssk)
{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+ struct sock *sk = subflow->conn;
+
tcp_set_state(ssk, TCP_CLOSE);
tcp_send_active_reset(ssk, GFP_ATOMIC);
tcp_done(ssk);
+ if (!test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &mptcp_sk(sk)->flags) &&
+ schedule_work(&mptcp_sk(sk)->work))
+ sock_hold(sk);
}
static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)