mptcp: consolidate initial ack seq generation
Currently the initial ack sequence is generated on demand whenever
it's requested and the remote key is handy. The relevant code is
scattered in different places and can lead to multiple, unneeded,
crypto operations.
This change consolidates the ack sequence generation code in a single
helper, storing the sequence number at the subflow level.
The above additionally saves a few conditional in fast-path and will
simplify the upcoming fast-open implementation.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index efc84816..66a599d 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3045,7 +3045,6 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC);
struct mptcp_sock *msk;
- u64 ack_seq;
if (!nsk)
return NULL;
@@ -3071,15 +3070,6 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd;
msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq;
- if (mp_opt->suboptions & OPTIONS_MPTCP_MPC) {
- msk->can_ack = true;
- msk->remote_key = mp_opt->sndr_key;
- mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq);
- ack_seq++;
- WRITE_ONCE(msk->ack_seq, ack_seq);
- atomic64_set(&msk->rcv_wnd_sent, ack_seq);
- }
-
sock_reset_flag(nsk, SOCK_RCU_FREE);
/* will be fully established after successful MPC subflow creation */
inet_sk_state_store(nsk, TCP_SYN_RECV);
@@ -3352,7 +3342,6 @@ void mptcp_finish_connect(struct sock *ssk)
struct mptcp_subflow_context *subflow;
struct mptcp_sock *msk;
struct sock *sk;
- u64 ack_seq;
subflow = mptcp_subflow_ctx(ssk);
sk = subflow->conn;
@@ -3360,22 +3349,16 @@ void mptcp_finish_connect(struct sock *ssk)
pr_debug("msk=%p, token=%u", sk, subflow->token);
- mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq);
- ack_seq++;
- subflow->map_seq = ack_seq;
+ subflow->map_seq = subflow->iasn;
subflow->map_subflow_seq = 1;
/* the socket is not connected yet, no msk/subflow ops can access/race
* accessing the field below
*/
- WRITE_ONCE(msk->remote_key, subflow->remote_key);
WRITE_ONCE(msk->local_key, subflow->local_key);
WRITE_ONCE(msk->write_seq, subflow->idsn + 1);
WRITE_ONCE(msk->snd_nxt, msk->write_seq);
- WRITE_ONCE(msk->ack_seq, ack_seq);
- WRITE_ONCE(msk->can_ack, 1);
WRITE_ONCE(msk->snd_una, msk->write_seq);
- atomic64_set(&msk->rcv_wnd_sent, ack_seq);
mptcp_pm_new_connection(msk, ssk, 0);
