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mptcp: Track received DATA_FIN sequence number and add related helpers

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Incoming DATA_FIN headers need to propagate the presence of the DATA_FIN
bit and the associated sequence number to the MPTCP layer, even when
arriving on a bare ACK that does not get added to the receive queue. Add
structure members to store the DATA_FIN information and helpers to set
and check those values.

Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mat Martineau
2020-07-28 15:12:03 -07:00
committed by David S. Miller
parent 7279da6145
commit 3721b9b646
3 changed files with 115 additions and 10 deletions
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16
net/mptcp/options.c
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@@ -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)
{