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mptcp: Use per-subflow storage for DATA_FIN sequence number

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Instead of reading the MPTCP-level sequence number when sending DATA_FIN,
store the data in the subflow so it can be safely accessed when the
subflow TCP headers are written to the packet without the MPTCP-level
lock held. This also allows the MPTCP-level socket to close individual
subflows without closing the MPTCP connection.

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 2020-02-28 15:47:40 -08:00 committed by David S. Miller
parent 1954b86016
commit 76c42a29c0
3 changed files with 21 additions and 6 deletions
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5
net/mptcp/options.c
View File

@ -312,7 +312,7 @@ static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,
*/
ext->use_map = 1;
ext->dsn64 = 1;
ext->data_seq = mptcp_sk(subflow->conn)->write_seq;
ext->data_seq = subflow->data_fin_tx_seq;
ext->subflow_seq = 0;
ext->data_len = 1;
} else {
@ -354,8 +354,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
if (mpext)
opts->ext_copy = *mpext;
if (skb && tcp_fin &&
subflow->conn->sk_state != TCP_ESTABLISHED)
if (skb && tcp_fin && subflow->data_fin_tx_enable)
mptcp_write_data_fin(subflow, &opts->ext_copy);
ret = true;
}

20
net/mptcp/protocol.c
View File

@ -720,7 +720,8 @@ static void mptcp_cancel_work(struct sock *sk)
sock_put(sk);
}
static void mptcp_subflow_shutdown(struct sock *ssk, int how)
static void mptcp_subflow_shutdown(struct sock *ssk, int how,
bool data_fin_tx_enable, u64 data_fin_tx_seq)
{
lock_sock(ssk);
@ -733,6 +734,14 @@ static void mptcp_subflow_shutdown(struct sock *ssk, int how)
tcp_disconnect(ssk, O_NONBLOCK);
break;
default:
if (data_fin_tx_enable) {
struct mptcp_subflow_context *subflow;
subflow = mptcp_subflow_ctx(ssk);
subflow->data_fin_tx_seq = data_fin_tx_seq;
subflow->data_fin_tx_enable = 1;
}
ssk->sk_shutdown |= how;
tcp_shutdown(ssk, how);
break;
@ -749,6 +758,7 @@ static void mptcp_close(struct sock *sk, long timeout)
struct mptcp_subflow_context *subflow, *tmp;
struct mptcp_sock *msk = mptcp_sk(sk);
LIST_HEAD(conn_list);
u64 data_fin_tx_seq;
lock_sock(sk);
@ -757,11 +767,15 @@ static void mptcp_close(struct sock *sk, long timeout)
list_splice_init(&msk->conn_list, &conn_list);
data_fin_tx_seq = msk->write_seq;
release_sock(sk);
list_for_each_entry_safe(subflow, tmp, &conn_list, node) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
subflow->data_fin_tx_seq = data_fin_tx_seq;
subflow->data_fin_tx_enable = 1;
__mptcp_close_ssk(sk, ssk, subflow, timeout);
}
@ -854,7 +868,7 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
*err = -ENOBUFS;
local_bh_enable();
release_sock(sk);
mptcp_subflow_shutdown(newsk, SHUT_RDWR + 1);
mptcp_subflow_shutdown(newsk, SHUT_RDWR + 1, 0, 0);
tcp_close(newsk, 0);
return NULL;
}
@ -1309,7 +1323,7 @@ static int mptcp_shutdown(struct socket *sock, int how)
mptcp_for_each_subflow(msk, subflow) {
struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow);
mptcp_subflow_shutdown(tcp_sk, how);
mptcp_subflow_shutdown(tcp_sk, how, 1, msk->write_seq);
}
out_unlock:

2
net/mptcp/protocol.h
View File

@ -125,7 +125,9 @@ struct mptcp_subflow_context {
mpc_map : 1,
data_avail : 1,
rx_eof : 1,
data_fin_tx_enable : 1,
can_ack : 1; /* only after processing the remote a key */
u64 data_fin_tx_seq;
struct sock *tcp_sock; /* tcp sk backpointer */
struct sock *conn; /* parent mptcp_sock */