diff options
Diffstat (limited to 'net/mptcp/options.c')
| -rw-r--r-- | net/mptcp/options.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c index f157cb7e14c09..38583d1b9b5ff 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -782,6 +782,22 @@ static void update_una(struct mptcp_sock *msk, } } +bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq) +{ + /* Skip if DATA_FIN was already received. + * If updating simultaneously with the recvmsg loop, values + * should match. If they mismatch, the peer is misbehaving and + * we will prefer the most recent information. + */ + if (READ_ONCE(msk->rcv_data_fin) || !READ_ONCE(msk->first)) + return false; + + WRITE_ONCE(msk->rcv_data_fin_seq, data_fin_seq); + WRITE_ONCE(msk->rcv_data_fin, 1); + + return true; +} + static bool add_addr_hmac_valid(struct mptcp_sock *msk, struct mptcp_options_received *mp_opt) { |