diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2024-02-02 12:40:09 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-02-05 11:18:09 +0000 |
| commit | 9426ce476a705d13eb086d4be7c817856417816f (patch) | |
| tree | 6ad72cb5ab106657089d8eb59facbac95850ae7b /net/mptcp/protocol.c | |
| parent | d440a4e27acdede686b974b62a6b2b2bd7914437 (diff) | |
mptcp: annotate lockless access for RX path fields
The following fields:
- ack_seq
- snd_una
- wnd_end
- rmem_fwd_alloc
are protected by the data lock end accessed lockless in a few
spots. Ensure ONCE annotation for write (under such lock) and for
lockless read.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/protocol.c')
| -rw-r--r-- | net/mptcp/protocol.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index b1c24ac3630f..90804e7fb7f6 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -410,6 +410,7 @@ static void mptcp_close_wake_up(struct sock *sk) sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); } +/* called under the msk socket lock */ static bool mptcp_pending_data_fin_ack(struct sock *sk) { struct mptcp_sock *msk = mptcp_sk(sk); @@ -441,16 +442,17 @@ static void mptcp_check_data_fin_ack(struct sock *sk) } } +/* can be called with no lock acquired */ static bool mptcp_pending_data_fin(struct sock *sk, u64 *seq) { struct mptcp_sock *msk = mptcp_sk(sk); if (READ_ONCE(msk->rcv_data_fin) && - ((1 << sk->sk_state) & + ((1 << inet_sk_state_load(sk)) & (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2))) { u64 rcv_data_fin_seq = READ_ONCE(msk->rcv_data_fin_seq); - if (msk->ack_seq == rcv_data_fin_seq) { + if (READ_ONCE(msk->ack_seq) == rcv_data_fin_seq) { if (seq) *seq = rcv_data_fin_seq; @@ -748,7 +750,7 @@ static bool __mptcp_ofo_queue(struct mptcp_sock *msk) __skb_queue_tail(&sk->sk_receive_queue, skb); } msk->bytes_received += end_seq - msk->ack_seq; - msk->ack_seq = end_seq; + WRITE_ONCE(msk->ack_seq, end_seq); moved = true; } return moved; @@ -985,6 +987,7 @@ static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag) put_page(dfrag->page); } +/* called under both the msk socket lock and the data lock */ static void __mptcp_clean_una(struct sock *sk) { struct mptcp_sock *msk = mptcp_sk(sk); @@ -2110,7 +2113,7 @@ static unsigned int mptcp_inq_hint(const struct sock *sk) skb = skb_peek(&msk->receive_queue); if (skb) { - u64 hint_val = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq; + u64 hint_val = READ_ONCE(msk->ack_seq) - MPTCP_SKB_CB(skb)->map_seq; if (hint_val >= INT_MAX) return INT_MAX; @@ -2754,7 +2757,7 @@ static void __mptcp_init_sock(struct sock *sk) __skb_queue_head_init(&msk->receive_queue); msk->out_of_order_queue = RB_ROOT; msk->first_pending = NULL; - msk->rmem_fwd_alloc = 0; + WRITE_ONCE(msk->rmem_fwd_alloc, 0); WRITE_ONCE(msk->rmem_released, 0); msk->timer_ival = TCP_RTO_MIN; msk->scaling_ratio = TCP_DEFAULT_SCALING_RATIO; @@ -2970,7 +2973,7 @@ static void __mptcp_destroy_sock(struct sock *sk) sk->sk_prot->destroy(sk); - WARN_ON_ONCE(msk->rmem_fwd_alloc); + WARN_ON_ONCE(READ_ONCE(msk->rmem_fwd_alloc)); WARN_ON_ONCE(msk->rmem_released); sk_stream_kill_queues(sk); xfrm_sk_free_policy(sk); @@ -3204,8 +3207,8 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk, WRITE_ONCE(msk->write_seq, subflow_req->idsn + 1); WRITE_ONCE(msk->snd_nxt, msk->write_seq); - msk->snd_una = msk->write_seq; - msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd; + WRITE_ONCE(msk->snd_una, msk->write_seq); + WRITE_ONCE(msk->wnd_end, msk->snd_nxt + req->rsk_rcv_wnd); msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq; mptcp_init_sched(msk, mptcp_sk(sk)->sched); |