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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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3
net/mptcp/protocol.h
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@@ -193,12 +193,14 @@ struct mptcp_sock {
u64 remote_key;
u64 write_seq;
u64 ack_seq;
u64 rcv_data_fin_seq;
atomic64_t snd_una;
unsigned long timer_ival;
u32 token;
unsigned long flags;
bool can_ack;
bool fully_established;
bool rcv_data_fin;
bool snd_data_fin_enable;
spinlock_t join_list_lock;
struct work_struct work;
@@ -385,6 +387,7 @@ void mptcp_data_ready(struct sock *sk, struct sock *ssk);
bool mptcp_finish_join(struct sock *sk);
void mptcp_data_acked(struct sock *sk);
void mptcp_subflow_eof(struct sock *sk);
bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq);
void __init mptcp_token_init(void);
static inline void mptcp_token_init_request(struct request_sock *req)