[PATCH net 0/4] mptcp: close subflow when receiving TCP+FIN and misc.

[PATCH net 0/4] mptcp: close subflow when receiving TCP+FIN and misc.

[Matthieu Baerts (NGI0)]

Here are different fixes:

Patch 1 closes the subflow after having received a FIN, instead of
leaving it half-closed until the end of the MPTCP connection. A fix for
v5.12.

Patch 2 validates the previous patch.

Patch 3 is a fix for a recent fix to check both directions for the
backup flag. It can follow the 'Fixes' commit and be backported up to
v5.7.

Patch 4 adds a missing \n at the end of pr_debug(), causing debug
messages to be displayed with a delay, which confuses the debugger. A
fix for v5.6.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
Note: Peter's email address has been removed from the Cc list, because
it is bouncing.

---
Matthieu Baerts (NGI0) (4):
      mptcp: close subflow when receiving TCP+FIN
      selftests: mptcp: join: cannot rm sf if closed
      mptcp: sched: check both backup in retrans
      mptcp: pr_debug: add missing \n at the end

 net/mptcp/fastopen.c                            |  4 +-
 net/mptcp/options.c                             | 50 ++++++++++-----------
 net/mptcp/pm.c                                  | 28 ++++++------
 net/mptcp/pm_netlink.c                          | 20 ++++-----
 net/mptcp/protocol.c                            | 59 +++++++++++++------------
 net/mptcp/protocol.h                            |  4 +-
 net/mptcp/sched.c                               |  4 +-
 net/mptcp/sockopt.c                             |  4 +-
 net/mptcp/subflow.c                             | 56 ++++++++++++-----------
 tools/testing/selftests/net/mptcp/mptcp_join.sh | 11 ++---
 10 files changed, 122 insertions(+), 118 deletions(-)
---
base-commit: 31a972959ae57691a1e4f539399b2674ae576086
change-id: 20240826-net-mptcp-close-extra-sf-fin-19d4e5aa4c9c

Best regards,
-- 
Matthieu Baerts (NGI0) <matttbe@kernel.org>

[PATCH net 1/4] mptcp: close subflow when receiving TCP+FIN

[Matthieu Baerts (NGI0)]

When a peer decides to close one subflow in the middle of a connection
having multiple subflows, the receiver of the first FIN should accept
that, and close the subflow on its side as well. If not, the subflow
will stay half closed, and would even continue to be used until the end
of the MPTCP connection or a reset from the network.

The issue has not been seen before, probably because the in-kernel
path-manager always sends a RM_ADDR before closing the subflow. Upon the
reception of this RM_ADDR, the other peer will initiate the closure on
its side as well. On the other hand, if the RM_ADDR is lost, or if the
path-manager of the other peer only closes the subflow without sending a
RM_ADDR, the subflow would switch to TCP_CLOSE_WAIT, but that's it,
leaving the subflow half-closed.

So now, when the subflow switches to the TCP_CLOSE_WAIT state, and if
the MPTCP connection has not been closed before with a DATA_FIN, the
kernel owning the subflow schedules its worker to initiate the closure
on its side as well.

This issue can be easily reproduced with packetdrill, as visible in [1],
by creating an additional subflow, injecting a FIN+ACK before sending
the DATA_FIN, and expecting a FIN+ACK in return.

Fixes: 40947e13997a ("mptcp: schedule worker when subflow is closed")
Cc: stable@vger.kernel.org
Link: https://github.com/multipath-tcp/packetdrill/pull/154 [1]
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/protocol.c | 5 ++++-
 net/mptcp/subflow.c  | 8 ++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 0d536b183a6c..151e82e2ff2e 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2533,8 +2533,11 @@ static void __mptcp_close_subflow(struct sock *sk)
 
 	mptcp_for_each_subflow_safe(msk, subflow, tmp) {
 		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+		int ssk_state = inet_sk_state_load(ssk);
 
-		if (inet_sk_state_load(ssk) != TCP_CLOSE)
+		if (ssk_state != TCP_CLOSE &&
+		    (ssk_state != TCP_CLOSE_WAIT ||
+		     inet_sk_state_load(sk) != TCP_ESTABLISHED))
 			continue;
 
 		/* 'subflow_data_ready' will re-sched once rx queue is empty */
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index a21c712350c3..4834e7fc2fb6 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1255,12 +1255,16 @@ static void mptcp_subflow_discard_data(struct sock *ssk, struct sk_buff *skb,
 /* sched mptcp worker to remove the subflow if no more data is pending */
 static void subflow_sched_work_if_closed(struct mptcp_sock *msk, struct sock *ssk)
 {
-	if (likely(ssk->sk_state != TCP_CLOSE))
+	struct sock *sk = (struct sock *)msk;
+
+	if (likely(ssk->sk_state != TCP_CLOSE &&
+		   (ssk->sk_state != TCP_CLOSE_WAIT ||
+		    inet_sk_state_load(sk) != TCP_ESTABLISHED)))
 		return;
 
 	if (skb_queue_empty(&ssk->sk_receive_queue) &&
 	    !test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags))
-		mptcp_schedule_work((struct sock *)msk);
+		mptcp_schedule_work(sk);
 }
 
 static bool subflow_can_fallback(struct mptcp_subflow_context *subflow)

-- 
2.45.2

[PATCH net 2/4] selftests: mptcp: join: cannot rm sf if closed

[Matthieu Baerts (NGI0)]

Thanks to the previous commit, the MPTCP subflows are now closed on both
directions even when only the MPTCP path-manager of one peer asks for
their closure.

In the two tests modified here -- "userspace pm add & remove address"
and "userspace pm create destroy subflow" -- one peer is controlled by
the userspace PM, and the other one by the in-kernel PM. When the
userspace PM sends a RM_ADDR notification, the in-kernel PM will
automatically react by closing all subflows using this address. Now,
thanks to the previous commit, the subflows are properly closed on both
directions, the userspace PM can then no longer closes the same
subflows if they are already closed. Before, it was OK to do that,
because the subflows were still half-opened, still OK to send a RM_ADDR.

In other words, thanks to the previous commit closing the subflows, an
error will be returned to the userspace if it tries to close a subflow
that has already been closed. So no need to run this command, which mean
that the linked counters will then not be incremented.

These tests are then no longer sending both a RM_ADDR, then closing the
linked subflow just after. The test with the userspace PM on the server
side is now removing one subflow linked to one address, then sending
a RM_ADDR for another address. The test with the userspace PM on the
client side is now only removing the subflow that was previously
created.

Fixes: 4369c198e599 ("selftests: mptcp: test userspace pm out of transfer")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 89e553e0e0c2..264040a760c6 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -3429,14 +3429,12 @@ userspace_tests()
 			"signal"
 		userspace_pm_chk_get_addr "${ns1}" "10" "id 10 flags signal 10.0.2.1"
 		userspace_pm_chk_get_addr "${ns1}" "20" "id 20 flags signal 10.0.3.1"
-		userspace_pm_rm_addr $ns1 10
 		userspace_pm_rm_sf $ns1 "::ffff:10.0.2.1" $MPTCP_LIB_EVENT_SUB_ESTABLISHED
 		userspace_pm_chk_dump_addr "${ns1}" \
-			"id 20 flags signal 10.0.3.1" "after rm_addr 10"
+			"id 20 flags signal 10.0.3.1" "after rm_sf 10"
 		userspace_pm_rm_addr $ns1 20
-		userspace_pm_rm_sf $ns1 10.0.3.1 $MPTCP_LIB_EVENT_SUB_ESTABLISHED
 		userspace_pm_chk_dump_addr "${ns1}" "" "after rm_addr 20"
-		chk_rm_nr 2 2 invert
+		chk_rm_nr 1 1 invert
 		chk_mptcp_info subflows 0 subflows 0
 		chk_subflows_total 1 1
 		kill_events_pids
@@ -3460,12 +3458,11 @@ userspace_tests()
 			"id 20 flags subflow 10.0.3.2" \
 			"subflow"
 		userspace_pm_chk_get_addr "${ns2}" "20" "id 20 flags subflow 10.0.3.2"
-		userspace_pm_rm_addr $ns2 20
 		userspace_pm_rm_sf $ns2 10.0.3.2 $MPTCP_LIB_EVENT_SUB_ESTABLISHED
 		userspace_pm_chk_dump_addr "${ns2}" \
 			"" \
-			"after rm_addr 20"
-		chk_rm_nr 1 1
+			"after rm_sf 20"
+		chk_rm_nr 0 1
 		chk_mptcp_info subflows 0 subflows 0
 		chk_subflows_total 1 1
 		kill_events_pids

-- 
2.45.2

[PATCH net 3/4] mptcp: sched: check both backup in retrans

[Matthieu Baerts (NGI0)]

The 'mptcp_subflow_context' structure has two items related to the
backup flags:

 - 'backup': the subflow has been marked as backup by the other peer

 - 'request_bkup': the backup flag has been set by the host

Looking only at the 'backup' flag can make sense in some cases, but it
is not the behaviour of the default packet scheduler when selecting
paths.

As explained in the commit b6a66e521a20 ("mptcp: sched: check both
directions for backup"), the packet scheduler should look at both flags,
because that was the behaviour from the beginning: the 'backup' flag was
set by accident instead of the 'request_bkup' one. Now that the latter
has been fixed, get_retrans() needs to be adapted as well.

Fixes: b6a66e521a20 ("mptcp: sched: check both directions for backup")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/protocol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 151e82e2ff2e..34fec753b9c1 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2326,7 +2326,7 @@ struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk)
 			continue;
 		}
 
-		if (subflow->backup) {
+		if (subflow->backup || subflow->request_bkup) {
 			if (!backup)
 				backup = ssk;
 			continue;

-- 
2.45.2

[PATCH net 4/4] mptcp: pr_debug: add missing \n at the end

[Matthieu Baerts (NGI0)]

pr_debug() have been added in various places in MPTCP code to help
developers to debug some situations. With the dynamic debug feature, it
is easy to enable all or some of them, and asks users to reproduce
issues with extra debug.

Many of these pr_debug() don't end with a new line, while no 'pr_cont()'
are used in MPTCP code. So the goal was not to display multiple debug
messages on one line: they were then not missing the '\n' on purpose.
Not having the new line at the end causes these messages to be printed
with a delay, when something else needs to be printed. This issue is not
visible when many messages need to be printed, but it is annoying and
confusing when only specific messages are expected, e.g.

  # echo "func mptcp_pm_add_addr_echoed +fmp" \
        > /sys/kernel/debug/dynamic_debug/control
  # ./mptcp_join.sh "signal address"; \
        echo "$(awk '{print $1}' /proc/uptime) - end"; \
        sleep 5s; \
        echo "$(awk '{print $1}' /proc/uptime) - restart"; \
        ./mptcp_join.sh "signal address"
  013 signal address
      (...)
  10.75 - end
  15.76 - restart
  013 signal address
  [  10.367935] mptcp:mptcp_pm_add_addr_echoed: MPTCP: msk=(...)
      (...)

  => a delay of 5 seconds: printed with a 10.36 ts, but after 'restart'
     which was printed at the 15.76 ts.

The 'Fixes' tag here below points to the first pr_debug() used without
'\n' in net/mptcp. This patch could be split in many small ones, with
different Fixes tag, but it doesn't seem worth it, because it is easy to
re-generate this patch with this simple 'sed' command:

  git grep -l pr_debug -- net/mptcp |
    xargs sed -i "s/\(pr_debug(\".*[^n]\)\(\"[,)]\)/\1\\\n\2/g"

So in case of conflicts, simply drop the modifications, and launch this
command.

Fixes: f870fa0b5768 ("mptcp: Add MPTCP socket stubs")
Cc: stable@vger.kernel.org
Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/fastopen.c   |  4 ++--
 net/mptcp/options.c    | 50 ++++++++++++++++++++++++------------------------
 net/mptcp/pm.c         | 28 +++++++++++++--------------
 net/mptcp/pm_netlink.c | 20 +++++++++----------
 net/mptcp/protocol.c   | 52 +++++++++++++++++++++++++-------------------------
 net/mptcp/protocol.h   |  4 ++--
 net/mptcp/sched.c      |  4 ++--
 net/mptcp/sockopt.c    |  4 ++--
 net/mptcp/subflow.c    | 48 +++++++++++++++++++++++-----------------------
 9 files changed, 107 insertions(+), 107 deletions(-)

diff --git a/net/mptcp/fastopen.c b/net/mptcp/fastopen.c
index ad28da655f8b..a29ff901df75 100644
--- a/net/mptcp/fastopen.c
+++ b/net/mptcp/fastopen.c
@@ -68,12 +68,12 @@ void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflo
 	skb = skb_peek_tail(&sk->sk_receive_queue);
 	if (skb) {
 		WARN_ON_ONCE(MPTCP_SKB_CB(skb)->end_seq);
-		pr_debug("msk %p moving seq %llx -> %llx end_seq %llx -> %llx", sk,
+		pr_debug("msk %p moving seq %llx -> %llx end_seq %llx -> %llx\n", sk,
 			 MPTCP_SKB_CB(skb)->map_seq, MPTCP_SKB_CB(skb)->map_seq + msk->ack_seq,
 			 MPTCP_SKB_CB(skb)->end_seq, MPTCP_SKB_CB(skb)->end_seq + msk->ack_seq);
 		MPTCP_SKB_CB(skb)->map_seq += msk->ack_seq;
 		MPTCP_SKB_CB(skb)->end_seq += msk->ack_seq;
 	}
 
-	pr_debug("msk=%p ack_seq=%llx", msk, msk->ack_seq);
+	pr_debug("msk=%p ack_seq=%llx\n", msk, msk->ack_seq);
 }
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index ac2f1a54cc43..370c3836b771 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -117,7 +117,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 			mp_opt->suboptions |= OPTION_MPTCP_CSUMREQD;
 			ptr += 2;
 		}
-		pr_debug("MP_CAPABLE version=%x, flags=%x, optlen=%d sndr=%llu, rcvr=%llu len=%d csum=%u",
+		pr_debug("MP_CAPABLE version=%x, flags=%x, optlen=%d sndr=%llu, rcvr=%llu len=%d csum=%u\n",
 			 version, flags, opsize, mp_opt->sndr_key,
 			 mp_opt->rcvr_key, mp_opt->data_len, mp_opt->csum);
 		break;
@@ -131,7 +131,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 			ptr += 4;
 			mp_opt->nonce = get_unaligned_be32(ptr);
 			ptr += 4;
-			pr_debug("MP_JOIN bkup=%u, id=%u, token=%u, nonce=%u",
+			pr_debug("MP_JOIN bkup=%u, id=%u, token=%u, nonce=%u\n",
 				 mp_opt->backup, mp_opt->join_id,
 				 mp_opt->token, mp_opt->nonce);
 		} else if (opsize == TCPOLEN_MPTCP_MPJ_SYNACK) {
@@ -142,19 +142,19 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 			ptr += 8;
 			mp_opt->nonce = get_unaligned_be32(ptr);
 			ptr += 4;
-			pr_debug("MP_JOIN bkup=%u, id=%u, thmac=%llu, nonce=%u",
+			pr_debug("MP_JOIN bkup=%u, id=%u, thmac=%llu, nonce=%u\n",
 				 mp_opt->backup, mp_opt->join_id,
 				 mp_opt->thmac, mp_opt->nonce);
 		} else if (opsize == TCPOLEN_MPTCP_MPJ_ACK) {
 			mp_opt->suboptions |= OPTION_MPTCP_MPJ_ACK;
 			ptr += 2;
 			memcpy(mp_opt->hmac, ptr, MPTCPOPT_HMAC_LEN);
-			pr_debug("MP_JOIN hmac");
+			pr_debug("MP_JOIN hmac\n");
 		}
 		break;
 
 	case MPTCPOPT_DSS:
-		pr_debug("DSS");
+		pr_debug("DSS\n");
 		ptr++;
 
 		/* we must clear 'mpc_map' be able to detect MP_CAPABLE
@@ -169,7 +169,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 		mp_opt->ack64 = (flags & MPTCP_DSS_ACK64) != 0;
 		mp_opt->use_ack = (flags & MPTCP_DSS_HAS_ACK);
 
-		pr_debug("data_fin=%d dsn64=%d use_map=%d ack64=%d use_ack=%d",
+		pr_debug("data_fin=%d dsn64=%d use_map=%d ack64=%d use_ack=%d\n",
 			 mp_opt->data_fin, mp_opt->dsn64,
 			 mp_opt->use_map, mp_opt->ack64,
 			 mp_opt->use_ack);
@@ -207,7 +207,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 				ptr += 4;
 			}
 
-			pr_debug("data_ack=%llu", mp_opt->data_ack);
+			pr_debug("data_ack=%llu\n", mp_opt->data_ack);
 		}
 
 		if (mp_opt->use_map) {
@@ -231,7 +231,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 				ptr += 2;
 			}
 
-			pr_debug("data_seq=%llu subflow_seq=%u data_len=%u csum=%d:%u",
+			pr_debug("data_seq=%llu subflow_seq=%u data_len=%u csum=%d:%u\n",
 				 mp_opt->data_seq, mp_opt->subflow_seq,
 				 mp_opt->data_len, !!(mp_opt->suboptions & OPTION_MPTCP_CSUMREQD),
 				 mp_opt->csum);
@@ -293,7 +293,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 			mp_opt->ahmac = get_unaligned_be64(ptr);
 			ptr += 8;
 		}
-		pr_debug("ADD_ADDR%s: id=%d, ahmac=%llu, echo=%d, port=%d",
+		pr_debug("ADD_ADDR%s: id=%d, ahmac=%llu, echo=%d, port=%d\n",
 			 (mp_opt->addr.family == AF_INET6) ? "6" : "",
 			 mp_opt->addr.id, mp_opt->ahmac, mp_opt->echo, ntohs(mp_opt->addr.port));
 		break;
@@ -309,7 +309,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 		mp_opt->rm_list.nr = opsize - TCPOLEN_MPTCP_RM_ADDR_BASE;
 		for (i = 0; i < mp_opt->rm_list.nr; i++)
 			mp_opt->rm_list.ids[i] = *ptr++;
-		pr_debug("RM_ADDR: rm_list_nr=%d", mp_opt->rm_list.nr);
+		pr_debug("RM_ADDR: rm_list_nr=%d\n", mp_opt->rm_list.nr);
 		break;
 
 	case MPTCPOPT_MP_PRIO:
@@ -318,7 +318,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 
 		mp_opt->suboptions |= OPTION_MPTCP_PRIO;
 		mp_opt->backup = *ptr++ & MPTCP_PRIO_BKUP;
-		pr_debug("MP_PRIO: prio=%d", mp_opt->backup);
+		pr_debug("MP_PRIO: prio=%d\n", mp_opt->backup);
 		break;
 
 	case MPTCPOPT_MP_FASTCLOSE:
@@ -329,7 +329,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 		mp_opt->rcvr_key = get_unaligned_be64(ptr);
 		ptr += 8;
 		mp_opt->suboptions |= OPTION_MPTCP_FASTCLOSE;
-		pr_debug("MP_FASTCLOSE: recv_key=%llu", mp_opt->rcvr_key);
+		pr_debug("MP_FASTCLOSE: recv_key=%llu\n", mp_opt->rcvr_key);
 		break;
 
 	case MPTCPOPT_RST:
@@ -343,7 +343,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 		flags = *ptr++;
 		mp_opt->reset_transient = flags & MPTCP_RST_TRANSIENT;
 		mp_opt->reset_reason = *ptr;
-		pr_debug("MP_RST: transient=%u reason=%u",
+		pr_debug("MP_RST: transient=%u reason=%u\n",
 			 mp_opt->reset_transient, mp_opt->reset_reason);
 		break;
 
@@ -354,7 +354,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 		ptr += 2;
 		mp_opt->suboptions |= OPTION_MPTCP_FAIL;
 		mp_opt->fail_seq = get_unaligned_be64(ptr);
-		pr_debug("MP_FAIL: data_seq=%llu", mp_opt->fail_seq);
+		pr_debug("MP_FAIL: data_seq=%llu\n", mp_opt->fail_seq);
 		break;
 
 	default:
@@ -417,7 +417,7 @@ bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
 		*size = TCPOLEN_MPTCP_MPC_SYN;
 		return true;
 	} else if (subflow->request_join) {
-		pr_debug("remote_token=%u, nonce=%u", subflow->remote_token,
+		pr_debug("remote_token=%u, nonce=%u\n", subflow->remote_token,
 			 subflow->local_nonce);
 		opts->suboptions = OPTION_MPTCP_MPJ_SYN;
 		opts->join_id = subflow->local_id;
@@ -500,7 +500,7 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
 			*size = TCPOLEN_MPTCP_MPC_ACK;
 		}
 
-		pr_debug("subflow=%p, local_key=%llu, remote_key=%llu map_len=%d",
+		pr_debug("subflow=%p, local_key=%llu, remote_key=%llu map_len=%d\n",
 			 subflow, subflow->local_key, subflow->remote_key,
 			 data_len);
 
@@ -509,7 +509,7 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
 		opts->suboptions = OPTION_MPTCP_MPJ_ACK;
 		memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);
 		*size = TCPOLEN_MPTCP_MPJ_ACK;
-		pr_debug("subflow=%p", subflow);
+		pr_debug("subflow=%p\n", subflow);
 
 		/* we can use the full delegate action helper only from BH context
 		 * If we are in process context - sk is flushing the backlog at
@@ -675,7 +675,7 @@ static bool mptcp_established_options_add_addr(struct sock *sk, struct sk_buff *
 
 	*size = len;
 	if (drop_other_suboptions) {
-		pr_debug("drop other suboptions");
+		pr_debug("drop other suboptions\n");
 		opts->suboptions = 0;
 
 		/* note that e.g. DSS could have written into the memory
@@ -695,7 +695,7 @@ static bool mptcp_established_options_add_addr(struct sock *sk, struct sk_buff *
 	} else {
 		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADDTX);
 	}
-	pr_debug("addr_id=%d, ahmac=%llu, echo=%d, port=%d",
+	pr_debug("addr_id=%d, ahmac=%llu, echo=%d, port=%d\n",
 		 opts->addr.id, opts->ahmac, echo, ntohs(opts->addr.port));
 
 	return true;
@@ -726,7 +726,7 @@ static bool mptcp_established_options_rm_addr(struct sock *sk,
 	opts->rm_list = rm_list;
 
 	for (i = 0; i < opts->rm_list.nr; i++)
-		pr_debug("rm_list_ids[%d]=%d", i, opts->rm_list.ids[i]);
+		pr_debug("rm_list_ids[%d]=%d\n", i, opts->rm_list.ids[i]);
 	MPTCP_ADD_STATS(sock_net(sk), MPTCP_MIB_RMADDRTX, opts->rm_list.nr);
 	return true;
 }
@@ -752,7 +752,7 @@ static bool mptcp_established_options_mp_prio(struct sock *sk,
 	opts->suboptions |= OPTION_MPTCP_PRIO;
 	opts->backup = subflow->request_bkup;
 
-	pr_debug("prio=%d", opts->backup);
+	pr_debug("prio=%d\n", opts->backup);
 
 	return true;
 }
@@ -794,7 +794,7 @@ static bool mptcp_established_options_fastclose(struct sock *sk,
 	opts->suboptions |= OPTION_MPTCP_FASTCLOSE;
 	opts->rcvr_key = READ_ONCE(msk->remote_key);
 
-	pr_debug("FASTCLOSE key=%llu", opts->rcvr_key);
+	pr_debug("FASTCLOSE key=%llu\n", opts->rcvr_key);
 	MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFASTCLOSETX);
 	return true;
 }
@@ -816,7 +816,7 @@ static bool mptcp_established_options_mp_fail(struct sock *sk,
 	opts->suboptions |= OPTION_MPTCP_FAIL;
 	opts->fail_seq = subflow->map_seq;
 
-	pr_debug("MP_FAIL fail_seq=%llu", opts->fail_seq);
+	pr_debug("MP_FAIL fail_seq=%llu\n", opts->fail_seq);
 	MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFAILTX);
 
 	return true;
@@ -904,7 +904,7 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
 		opts->csum_reqd = subflow_req->csum_reqd;
 		opts->allow_join_id0 = subflow_req->allow_join_id0;
 		*size = TCPOLEN_MPTCP_MPC_SYNACK;
-		pr_debug("subflow_req=%p, local_key=%llu",
+		pr_debug("subflow_req=%p, local_key=%llu\n",
 			 subflow_req, subflow_req->local_key);
 		return true;
 	} else if (subflow_req->mp_join) {
@@ -913,7 +913,7 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
 		opts->join_id = subflow_req->local_id;
 		opts->thmac = subflow_req->thmac;
 		opts->nonce = subflow_req->local_nonce;
-		pr_debug("req=%p, bkup=%u, id=%u, thmac=%llu, nonce=%u",
+		pr_debug("req=%p, bkup=%u, id=%u, thmac=%llu, nonce=%u\n",
 			 subflow_req, opts->backup, opts->join_id,
 			 opts->thmac, opts->nonce);
 		*size = TCPOLEN_MPTCP_MPJ_SYNACK;
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index 3e6e0f5510bb..3f8dbde243f1 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -19,7 +19,7 @@ int mptcp_pm_announce_addr(struct mptcp_sock *msk,
 {
 	u8 add_addr = READ_ONCE(msk->pm.addr_signal);
 
-	pr_debug("msk=%p, local_id=%d, echo=%d", msk, addr->id, echo);
+	pr_debug("msk=%p, local_id=%d, echo=%d\n", msk, addr->id, echo);
 
 	lockdep_assert_held(&msk->pm.lock);
 
@@ -45,7 +45,7 @@ int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_
 {
 	u8 rm_addr = READ_ONCE(msk->pm.addr_signal);
 
-	pr_debug("msk=%p, rm_list_nr=%d", msk, rm_list->nr);
+	pr_debug("msk=%p, rm_list_nr=%d\n", msk, rm_list->nr);
 
 	if (rm_addr) {
 		MPTCP_ADD_STATS(sock_net((struct sock *)msk),
@@ -66,7 +66,7 @@ void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int
 {
 	struct mptcp_pm_data *pm = &msk->pm;
 
-	pr_debug("msk=%p, token=%u side=%d", msk, READ_ONCE(msk->token), server_side);
+	pr_debug("msk=%p, token=%u side=%d\n", msk, READ_ONCE(msk->token), server_side);
 
 	WRITE_ONCE(pm->server_side, server_side);
 	mptcp_event(MPTCP_EVENT_CREATED, msk, ssk, GFP_ATOMIC);
@@ -90,7 +90,7 @@ bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk)
 
 	subflows_max = mptcp_pm_get_subflows_max(msk);
 
-	pr_debug("msk=%p subflows=%d max=%d allow=%d", msk, pm->subflows,
+	pr_debug("msk=%p subflows=%d max=%d allow=%d\n", msk, pm->subflows,
 		 subflows_max, READ_ONCE(pm->accept_subflow));
 
 	/* try to avoid acquiring the lock below */
@@ -114,7 +114,7 @@ bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk)
 static bool mptcp_pm_schedule_work(struct mptcp_sock *msk,
 				   enum mptcp_pm_status new_status)
 {
-	pr_debug("msk=%p status=%x new=%lx", msk, msk->pm.status,
+	pr_debug("msk=%p status=%x new=%lx\n", msk, msk->pm.status,
 		 BIT(new_status));
 	if (msk->pm.status & BIT(new_status))
 		return false;
@@ -129,7 +129,7 @@ void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk)
 	struct mptcp_pm_data *pm = &msk->pm;
 	bool announce = false;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	spin_lock_bh(&pm->lock);
 
@@ -153,14 +153,14 @@ void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk)
 
 void mptcp_pm_connection_closed(struct mptcp_sock *msk)
 {
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 }
 
 void mptcp_pm_subflow_established(struct mptcp_sock *msk)
 {
 	struct mptcp_pm_data *pm = &msk->pm;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	if (!READ_ONCE(pm->work_pending))
 		return;
@@ -212,7 +212,7 @@ void mptcp_pm_add_addr_received(const struct sock *ssk,
 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
 	struct mptcp_pm_data *pm = &msk->pm;
 
-	pr_debug("msk=%p remote_id=%d accept=%d", msk, addr->id,
+	pr_debug("msk=%p remote_id=%d accept=%d\n", msk, addr->id,
 		 READ_ONCE(pm->accept_addr));
 
 	mptcp_event_addr_announced(ssk, addr);
@@ -243,7 +243,7 @@ void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
 {
 	struct mptcp_pm_data *pm = &msk->pm;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	spin_lock_bh(&pm->lock);
 
@@ -267,7 +267,7 @@ void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
 	struct mptcp_pm_data *pm = &msk->pm;
 	u8 i;
 
-	pr_debug("msk=%p remote_ids_nr=%d", msk, rm_list->nr);
+	pr_debug("msk=%p remote_ids_nr=%d\n", msk, rm_list->nr);
 
 	for (i = 0; i < rm_list->nr; i++)
 		mptcp_event_addr_removed(msk, rm_list->ids[i]);
@@ -299,19 +299,19 @@ void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq)
 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
 
-	pr_debug("fail_seq=%llu", fail_seq);
+	pr_debug("fail_seq=%llu\n", fail_seq);
 
 	if (!READ_ONCE(msk->allow_infinite_fallback))
 		return;
 
 	if (!subflow->fail_tout) {
-		pr_debug("send MP_FAIL response and infinite map");
+		pr_debug("send MP_FAIL response and infinite map\n");
 
 		subflow->send_mp_fail = 1;
 		subflow->send_infinite_map = 1;
 		tcp_send_ack(sk);
 	} else {
-		pr_debug("MP_FAIL response received");
+		pr_debug("MP_FAIL response received\n");
 		WRITE_ONCE(subflow->fail_tout, 0);
 	}
 }
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 3e4ad801786f..8d2f97854c64 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -287,7 +287,7 @@ static void mptcp_pm_add_timer(struct timer_list *timer)
 	struct mptcp_sock *msk = entry->sock;
 	struct sock *sk = (struct sock *)msk;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	if (!msk)
 		return;
@@ -306,7 +306,7 @@ static void mptcp_pm_add_timer(struct timer_list *timer)
 	spin_lock_bh(&msk->pm.lock);
 
 	if (!mptcp_pm_should_add_signal_addr(msk)) {
-		pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id);
+		pr_debug("retransmit ADD_ADDR id=%d\n", entry->addr.id);
 		mptcp_pm_announce_addr(msk, &entry->addr, false);
 		mptcp_pm_add_addr_send_ack(msk);
 		entry->retrans_times++;
@@ -387,7 +387,7 @@ void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
 	struct sock *sk = (struct sock *)msk;
 	LIST_HEAD(free_list);
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	spin_lock_bh(&msk->pm.lock);
 	list_splice_init(&msk->pm.anno_list, &free_list);
@@ -473,7 +473,7 @@ static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_con
 	struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
 	bool slow;
 
-	pr_debug("send ack for %s",
+	pr_debug("send ack for %s\n",
 		 prio ? "mp_prio" : (mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr"));
 
 	slow = lock_sock_fast(ssk);
@@ -708,7 +708,7 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
 	add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk);
 	subflows_max = mptcp_pm_get_subflows_max(msk);
 
-	pr_debug("accepted %d:%d remote family %d",
+	pr_debug("accepted %d:%d remote family %d\n",
 		 msk->pm.add_addr_accepted, add_addr_accept_max,
 		 msk->pm.remote.family);
 
@@ -767,7 +767,7 @@ int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
 {
 	struct mptcp_subflow_context *subflow;
 
-	pr_debug("bkup=%d", bkup);
+	pr_debug("bkup=%d\n", bkup);
 
 	mptcp_for_each_subflow(msk, subflow) {
 		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
@@ -803,7 +803,7 @@ static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
 	struct sock *sk = (struct sock *)msk;
 	u8 i;
 
-	pr_debug("%s rm_list_nr %d",
+	pr_debug("%s rm_list_nr %d\n",
 		 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr);
 
 	msk_owned_by_me(msk);
@@ -832,7 +832,7 @@ static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
 			if (rm_type == MPTCP_MIB_RMSUBFLOW && !mptcp_local_id_match(msk, id, rm_id))
 				continue;
 
-			pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u mpc_id=%u",
+			pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u mpc_id=%u\n",
 				 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow",
 				 i, rm_id, id, remote_id, msk->mpc_endpoint_id);
 			spin_unlock_bh(&msk->pm.lock);
@@ -889,7 +889,7 @@ void mptcp_pm_nl_work(struct mptcp_sock *msk)
 
 	spin_lock_bh(&msk->pm.lock);
 
-	pr_debug("msk=%p status=%x", msk, pm->status);
+	pr_debug("msk=%p status=%x\n", msk, pm->status);
 	if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) {
 		pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED);
 		mptcp_pm_nl_add_addr_received(msk);
@@ -1476,7 +1476,7 @@ static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net,
 	long s_slot = 0, s_num = 0;
 	struct mptcp_sock *msk;
 
-	pr_debug("remove_id=%d", addr->id);
+	pr_debug("remove_id=%d\n", addr->id);
 
 	list.ids[list.nr++] = addr->id;
 
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 34fec753b9c1..b571fba88a2f 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -139,7 +139,7 @@ static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to,
 	    !skb_try_coalesce(to, from, &fragstolen, &delta))
 		return false;
 
-	pr_debug("colesced seq %llx into %llx new len %d new end seq %llx",
+	pr_debug("colesced seq %llx into %llx new len %d new end seq %llx\n",
 		 MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq,
 		 to->len, MPTCP_SKB_CB(from)->end_seq);
 	MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq;
@@ -217,7 +217,7 @@ static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb)
 	end_seq = MPTCP_SKB_CB(skb)->end_seq;
 	max_seq = atomic64_read(&msk->rcv_wnd_sent);
 
-	pr_debug("msk=%p seq=%llx limit=%llx empty=%d", msk, seq, max_seq,
+	pr_debug("msk=%p seq=%llx limit=%llx empty=%d\n", msk, seq, max_seq,
 		 RB_EMPTY_ROOT(&msk->out_of_order_queue));
 	if (after64(end_seq, max_seq)) {
 		/* out of window */
@@ -643,7 +643,7 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
 		}
 	}
 
-	pr_debug("msk=%p ssk=%p", msk, ssk);
+	pr_debug("msk=%p ssk=%p\n", msk, ssk);
 	tp = tcp_sk(ssk);
 	do {
 		u32 map_remaining, offset;
@@ -724,7 +724,7 @@ static bool __mptcp_ofo_queue(struct mptcp_sock *msk)
 	u64 end_seq;
 
 	p = rb_first(&msk->out_of_order_queue);
-	pr_debug("msk=%p empty=%d", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue));
+	pr_debug("msk=%p empty=%d\n", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue));
 	while (p) {
 		skb = rb_to_skb(p);
 		if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq))
@@ -746,7 +746,7 @@ static bool __mptcp_ofo_queue(struct mptcp_sock *msk)
 			int delta = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq;
 
 			/* skip overlapping data, if any */
-			pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d",
+			pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d\n",
 				 MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq,
 				 delta);
 			MPTCP_SKB_CB(skb)->offset += delta;
@@ -1240,7 +1240,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 	size_t copy;
 	int i;
 
-	pr_debug("msk=%p ssk=%p sending dfrag at seq=%llu len=%u already sent=%u",
+	pr_debug("msk=%p ssk=%p sending dfrag at seq=%llu len=%u already sent=%u\n",
 		 msk, ssk, dfrag->data_seq, dfrag->data_len, info->sent);
 
 	if (WARN_ON_ONCE(info->sent > info->limit ||
@@ -1341,7 +1341,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 	mpext->use_map = 1;
 	mpext->dsn64 = 1;
 
-	pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d",
+	pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d\n",
 		 mpext->data_seq, mpext->subflow_seq, mpext->data_len,
 		 mpext->dsn64);
 
@@ -1892,7 +1892,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 			if (!msk->first_pending)
 				WRITE_ONCE(msk->first_pending, dfrag);
 		}
-		pr_debug("msk=%p dfrag at seq=%llu len=%u sent=%u new=%d", msk,
+		pr_debug("msk=%p dfrag at seq=%llu len=%u sent=%u new=%d\n", msk,
 			 dfrag->data_seq, dfrag->data_len, dfrag->already_sent,
 			 !dfrag_collapsed);
 
@@ -2248,7 +2248,7 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 			}
 		}
 
-		pr_debug("block timeout %ld", timeo);
+		pr_debug("block timeout %ld\n", timeo);
 		sk_wait_data(sk, &timeo, NULL);
 	}
 
@@ -2264,7 +2264,7 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 		}
 	}
 
-	pr_debug("msk=%p rx queue empty=%d:%d copied=%d",
+	pr_debug("msk=%p rx queue empty=%d:%d copied=%d\n",
 		 msk, skb_queue_empty_lockless(&sk->sk_receive_queue),
 		 skb_queue_empty(&msk->receive_queue), copied);
 	if (!(flags & MSG_PEEK))
@@ -2717,7 +2717,7 @@ static void mptcp_mp_fail_no_response(struct mptcp_sock *msk)
 	if (!ssk)
 		return;
 
-	pr_debug("MP_FAIL doesn't respond, reset the subflow");
+	pr_debug("MP_FAIL doesn't respond, reset the subflow\n");
 
 	slow = lock_sock_fast(ssk);
 	mptcp_subflow_reset(ssk);
@@ -2891,7 +2891,7 @@ void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)
 		break;
 	default:
 		if (__mptcp_check_fallback(mptcp_sk(sk))) {
-			pr_debug("Fallback");
+			pr_debug("Fallback\n");
 			ssk->sk_shutdown |= how;
 			tcp_shutdown(ssk, how);
 
@@ -2901,7 +2901,7 @@ void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)
 			WRITE_ONCE(mptcp_sk(sk)->snd_una, mptcp_sk(sk)->snd_nxt);
 			mptcp_schedule_work(sk);
 		} else {
-			pr_debug("Sending DATA_FIN on subflow %p", ssk);
+			pr_debug("Sending DATA_FIN on subflow %p\n", ssk);
 			tcp_send_ack(ssk);
 			if (!mptcp_rtx_timer_pending(sk))
 				mptcp_reset_rtx_timer(sk);
@@ -2967,7 +2967,7 @@ static void mptcp_check_send_data_fin(struct sock *sk)
 	struct mptcp_subflow_context *subflow;
 	struct mptcp_sock *msk = mptcp_sk(sk);
 
-	pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu",
+	pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu\n",
 		 msk, msk->snd_data_fin_enable, !!mptcp_send_head(sk),
 		 msk->snd_nxt, msk->write_seq);
 
@@ -2991,7 +2991,7 @@ static void __mptcp_wr_shutdown(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 
-	pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d",
+	pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d\n",
 		 msk, msk->snd_data_fin_enable, sk->sk_shutdown, sk->sk_state,
 		 !!mptcp_send_head(sk));
 
@@ -3006,7 +3006,7 @@ static void __mptcp_destroy_sock(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	might_sleep();
 
@@ -3114,7 +3114,7 @@ bool __mptcp_close(struct sock *sk, long timeout)
 		mptcp_set_state(sk, TCP_CLOSE);
 
 	sock_hold(sk);
-	pr_debug("msk=%p state=%d", sk, sk->sk_state);
+	pr_debug("msk=%p state=%d\n", sk, sk->sk_state);
 	if (msk->token)
 		mptcp_event(MPTCP_EVENT_CLOSED, msk, NULL, GFP_KERNEL);
 
@@ -3546,7 +3546,7 @@ static int mptcp_get_port(struct sock *sk, unsigned short snum)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 
-	pr_debug("msk=%p, ssk=%p", msk, msk->first);
+	pr_debug("msk=%p, ssk=%p\n", msk, msk->first);
 	if (WARN_ON_ONCE(!msk->first))
 		return -EINVAL;
 
@@ -3563,7 +3563,7 @@ void mptcp_finish_connect(struct sock *ssk)
 	sk = subflow->conn;
 	msk = mptcp_sk(sk);
 
-	pr_debug("msk=%p, token=%u", sk, subflow->token);
+	pr_debug("msk=%p, token=%u\n", sk, subflow->token);
 
 	subflow->map_seq = subflow->iasn;
 	subflow->map_subflow_seq = 1;
@@ -3592,7 +3592,7 @@ bool mptcp_finish_join(struct sock *ssk)
 	struct sock *parent = (void *)msk;
 	bool ret = true;
 
-	pr_debug("msk=%p, subflow=%p", msk, subflow);
+	pr_debug("msk=%p, subflow=%p\n", msk, subflow);
 
 	/* mptcp socket already closing? */
 	if (!mptcp_is_fully_established(parent)) {
@@ -3638,7 +3638,7 @@ bool mptcp_finish_join(struct sock *ssk)
 
 static void mptcp_shutdown(struct sock *sk, int how)
 {
-	pr_debug("sk=%p, how=%d", sk, how);
+	pr_debug("sk=%p, how=%d\n", sk, how);
 
 	if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk))
 		__mptcp_wr_shutdown(sk);
@@ -3859,7 +3859,7 @@ static int mptcp_listen(struct socket *sock, int backlog)
 	struct sock *ssk;
 	int err;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	lock_sock(sk);
 
@@ -3898,7 +3898,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
 	struct mptcp_sock *msk = mptcp_sk(sock->sk);
 	struct sock *ssk, *newsk;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	/* Buggy applications can call accept on socket states other then LISTEN
 	 * but no need to allocate the first subflow just to error out.
@@ -3907,12 +3907,12 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
 	if (!ssk)
 		return -EINVAL;
 
-	pr_debug("ssk=%p, listener=%p", ssk, mptcp_subflow_ctx(ssk));
+	pr_debug("ssk=%p, listener=%p\n", ssk, mptcp_subflow_ctx(ssk));
 	newsk = inet_csk_accept(ssk, arg);
 	if (!newsk)
 		return arg->err;
 
-	pr_debug("newsk=%p, subflow is mptcp=%d", newsk, sk_is_mptcp(newsk));
+	pr_debug("newsk=%p, subflow is mptcp=%d\n", newsk, sk_is_mptcp(newsk));
 	if (sk_is_mptcp(newsk)) {
 		struct mptcp_subflow_context *subflow;
 		struct sock *new_mptcp_sock;
@@ -4005,7 +4005,7 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
 	sock_poll_wait(file, sock, wait);
 
 	state = inet_sk_state_load(sk);
-	pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags);
+	pr_debug("msk=%p state=%d flags=%lx\n", msk, state, msk->flags);
 	if (state == TCP_LISTEN) {
 		struct sock *ssk = READ_ONCE(msk->first);
 
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index a1c1b0ff1ce1..240d7c2ea551 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -1177,7 +1177,7 @@ static inline bool mptcp_check_fallback(const struct sock *sk)
 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
 {
 	if (__mptcp_check_fallback(msk)) {
-		pr_debug("TCP fallback already done (msk=%p)", msk);
+		pr_debug("TCP fallback already done (msk=%p)\n", msk);
 		return;
 	}
 	set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
@@ -1213,7 +1213,7 @@ static inline void mptcp_do_fallback(struct sock *ssk)
 	}
 }
 
-#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
+#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)\n", __func__, a)
 
 static inline bool mptcp_check_infinite_map(struct sk_buff *skb)
 {
diff --git a/net/mptcp/sched.c b/net/mptcp/sched.c
index 4a7fd0508ad2..78ed508ebc1b 100644
--- a/net/mptcp/sched.c
+++ b/net/mptcp/sched.c
@@ -86,7 +86,7 @@ int mptcp_register_scheduler(struct mptcp_sched_ops *sched)
 	list_add_tail_rcu(&sched->list, &mptcp_sched_list);
 	spin_unlock(&mptcp_sched_list_lock);
 
-	pr_debug("%s registered", sched->name);
+	pr_debug("%s registered\n", sched->name);
 	return 0;
 }
 
@@ -118,7 +118,7 @@ int mptcp_init_sched(struct mptcp_sock *msk,
 	if (msk->sched->init)
 		msk->sched->init(msk);
 
-	pr_debug("sched=%s", msk->sched->name);
+	pr_debug("sched=%s\n", msk->sched->name);
 
 	return 0;
 }
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 2026a9a36f80..505445a9598f 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -873,7 +873,7 @@ int mptcp_setsockopt(struct sock *sk, int level, int optname,
 	struct mptcp_sock *msk = mptcp_sk(sk);
 	struct sock *ssk;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	if (level == SOL_SOCKET)
 		return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen);
@@ -1453,7 +1453,7 @@ int mptcp_getsockopt(struct sock *sk, int level, int optname,
 	struct mptcp_sock *msk = mptcp_sk(sk);
 	struct sock *ssk;
 
-	pr_debug("msk=%p", msk);
+	pr_debug("msk=%p\n", msk);
 
 	/* @@ the meaning of setsockopt() when the socket is connected and
 	 * there are multiple subflows is not yet defined. It is up to the
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 4834e7fc2fb6..064ab3235893 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -39,7 +39,7 @@ static void subflow_req_destructor(struct request_sock *req)
 {
 	struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
 
-	pr_debug("subflow_req=%p", subflow_req);
+	pr_debug("subflow_req=%p\n", subflow_req);
 
 	if (subflow_req->msk)
 		sock_put((struct sock *)subflow_req->msk);
@@ -146,7 +146,7 @@ static int subflow_check_req(struct request_sock *req,
 	struct mptcp_options_received mp_opt;
 	bool opt_mp_capable, opt_mp_join;
 
-	pr_debug("subflow_req=%p, listener=%p", subflow_req, listener);
+	pr_debug("subflow_req=%p, listener=%p\n", subflow_req, listener);
 
 #ifdef CONFIG_TCP_MD5SIG
 	/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
@@ -221,7 +221,7 @@ static int subflow_check_req(struct request_sock *req,
 		}
 
 		if (subflow_use_different_sport(subflow_req->msk, sk_listener)) {
-			pr_debug("syn inet_sport=%d %d",
+			pr_debug("syn inet_sport=%d %d\n",
 				 ntohs(inet_sk(sk_listener)->inet_sport),
 				 ntohs(inet_sk((struct sock *)subflow_req->msk)->inet_sport));
 			if (!mptcp_pm_sport_in_anno_list(subflow_req->msk, sk_listener)) {
@@ -243,7 +243,7 @@ static int subflow_check_req(struct request_sock *req,
 			subflow_init_req_cookie_join_save(subflow_req, skb);
 		}
 
-		pr_debug("token=%u, remote_nonce=%u msk=%p", subflow_req->token,
+		pr_debug("token=%u, remote_nonce=%u msk=%p\n", subflow_req->token,
 			 subflow_req->remote_nonce, subflow_req->msk);
 	}
 
@@ -527,7 +527,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 	subflow->rel_write_seq = 1;
 	subflow->conn_finished = 1;
 	subflow->ssn_offset = TCP_SKB_CB(skb)->seq;
-	pr_debug("subflow=%p synack seq=%x", subflow, subflow->ssn_offset);
+	pr_debug("subflow=%p synack seq=%x\n", subflow, subflow->ssn_offset);
 
 	mptcp_get_options(skb, &mp_opt);
 	if (subflow->request_mptcp) {
@@ -559,7 +559,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 		subflow->thmac = mp_opt.thmac;
 		subflow->remote_nonce = mp_opt.nonce;
 		WRITE_ONCE(subflow->remote_id, mp_opt.join_id);
-		pr_debug("subflow=%p, thmac=%llu, remote_nonce=%u backup=%d",
+		pr_debug("subflow=%p, thmac=%llu, remote_nonce=%u backup=%d\n",
 			 subflow, subflow->thmac, subflow->remote_nonce,
 			 subflow->backup);
 
@@ -585,7 +585,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_JOINSYNACKBACKUPRX);
 
 		if (subflow_use_different_dport(msk, sk)) {
-			pr_debug("synack inet_dport=%d %d",
+			pr_debug("synack inet_dport=%d %d\n",
 				 ntohs(inet_sk(sk)->inet_dport),
 				 ntohs(inet_sk(parent)->inet_dport));
 			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_JOINPORTSYNACKRX);
@@ -655,7 +655,7 @@ static int subflow_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
 
-	pr_debug("subflow=%p", subflow);
+	pr_debug("subflow=%p\n", subflow);
 
 	/* Never answer to SYNs sent to broadcast or multicast */
 	if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
@@ -686,7 +686,7 @@ static int subflow_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
 
-	pr_debug("subflow=%p", subflow);
+	pr_debug("subflow=%p\n", subflow);
 
 	if (skb->protocol == htons(ETH_P_IP))
 		return subflow_v4_conn_request(sk, skb);
@@ -807,7 +807,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
 	struct mptcp_sock *owner;
 	struct sock *child;
 
-	pr_debug("listener=%p, req=%p, conn=%p", listener, req, listener->conn);
+	pr_debug("listener=%p, req=%p, conn=%p\n", listener, req, listener->conn);
 
 	/* After child creation we must look for MPC even when options
 	 * are not parsed
@@ -898,7 +898,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
 			ctx->conn = (struct sock *)owner;
 
 			if (subflow_use_different_sport(owner, sk)) {
-				pr_debug("ack inet_sport=%d %d",
+				pr_debug("ack inet_sport=%d %d\n",
 					 ntohs(inet_sk(sk)->inet_sport),
 					 ntohs(inet_sk((struct sock *)owner)->inet_sport));
 				if (!mptcp_pm_sport_in_anno_list(owner, sk)) {
@@ -961,7 +961,7 @@ enum mapping_status {
 
 static void dbg_bad_map(struct mptcp_subflow_context *subflow, u32 ssn)
 {
-	pr_debug("Bad mapping: ssn=%d map_seq=%d map_data_len=%d",
+	pr_debug("Bad mapping: ssn=%d map_seq=%d map_data_len=%d\n",
 		 ssn, subflow->map_subflow_seq, subflow->map_data_len);
 }
 
@@ -1121,7 +1121,7 @@ static enum mapping_status get_mapping_status(struct sock *ssk,
 
 	data_len = mpext->data_len;
 	if (data_len == 0) {
-		pr_debug("infinite mapping received");
+		pr_debug("infinite mapping received\n");
 		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_INFINITEMAPRX);
 		subflow->map_data_len = 0;
 		return MAPPING_INVALID;
@@ -1133,7 +1133,7 @@ static enum mapping_status get_mapping_status(struct sock *ssk,
 		if (data_len == 1) {
 			bool updated = mptcp_update_rcv_data_fin(msk, mpext->data_seq,
 								 mpext->dsn64);
-			pr_debug("DATA_FIN with no payload seq=%llu", mpext->data_seq);
+			pr_debug("DATA_FIN with no payload seq=%llu\n", mpext->data_seq);
 			if (subflow->map_valid) {
 				/* A DATA_FIN might arrive in a DSS
 				 * option before the previous mapping
@@ -1159,7 +1159,7 @@ static enum mapping_status get_mapping_status(struct sock *ssk,
 			data_fin_seq &= GENMASK_ULL(31, 0);
 
 		mptcp_update_rcv_data_fin(msk, data_fin_seq, mpext->dsn64);
-		pr_debug("DATA_FIN with mapping seq=%llu dsn64=%d",
+		pr_debug("DATA_FIN with mapping seq=%llu dsn64=%d\n",
 			 data_fin_seq, mpext->dsn64);
 
 		/* Adjust for DATA_FIN using 1 byte of sequence space */
@@ -1205,7 +1205,7 @@ static enum mapping_status get_mapping_status(struct sock *ssk,
 	if (unlikely(subflow->map_csum_reqd != csum_reqd))
 		return MAPPING_INVALID;
 
-	pr_debug("new map seq=%llu subflow_seq=%u data_len=%u csum=%d:%u",
+	pr_debug("new map seq=%llu subflow_seq=%u data_len=%u csum=%d:%u\n",
 		 subflow->map_seq, subflow->map_subflow_seq,
 		 subflow->map_data_len, subflow->map_csum_reqd,
 		 subflow->map_data_csum);
@@ -1240,7 +1240,7 @@ static void mptcp_subflow_discard_data(struct sock *ssk, struct sk_buff *skb,
 	avail_len = skb->len - offset;
 	incr = limit >= avail_len ? avail_len + fin : limit;
 
-	pr_debug("discarding=%d len=%d offset=%d seq=%d", incr, skb->len,
+	pr_debug("discarding=%d len=%d offset=%d seq=%d\n", incr, skb->len,
 		 offset, subflow->map_subflow_seq);
 	MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DUPDATA);
 	tcp_sk(ssk)->copied_seq += incr;
@@ -1341,7 +1341,7 @@ static bool subflow_check_data_avail(struct sock *ssk)
 
 		old_ack = READ_ONCE(msk->ack_seq);
 		ack_seq = mptcp_subflow_get_mapped_dsn(subflow);
-		pr_debug("msk ack_seq=%llx subflow ack_seq=%llx", old_ack,
+		pr_debug("msk ack_seq=%llx subflow ack_seq=%llx\n", old_ack,
 			 ack_seq);
 		if (unlikely(before64(ack_seq, old_ack))) {
 			mptcp_subflow_discard_data(ssk, skb, old_ack - ack_seq);
@@ -1413,7 +1413,7 @@ bool mptcp_subflow_data_available(struct sock *sk)
 		subflow->map_valid = 0;
 		WRITE_ONCE(subflow->data_avail, false);
 
-		pr_debug("Done with mapping: seq=%u data_len=%u",
+		pr_debug("Done with mapping: seq=%u data_len=%u\n",
 			 subflow->map_subflow_seq,
 			 subflow->map_data_len);
 	}
@@ -1523,7 +1523,7 @@ void mptcpv6_handle_mapped(struct sock *sk, bool mapped)
 
 	target = mapped ? &subflow_v6m_specific : subflow_default_af_ops(sk);
 
-	pr_debug("subflow=%p family=%d ops=%p target=%p mapped=%d",
+	pr_debug("subflow=%p family=%d ops=%p target=%p mapped=%d\n",
 		 subflow, sk->sk_family, icsk->icsk_af_ops, target, mapped);
 
 	if (likely(icsk->icsk_af_ops == target))
@@ -1616,7 +1616,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
 		goto failed;
 
 	mptcp_crypto_key_sha(subflow->remote_key, &remote_token, NULL);
-	pr_debug("msk=%p remote_token=%u local_id=%d remote_id=%d", msk,
+	pr_debug("msk=%p remote_token=%u local_id=%d remote_id=%d\n", msk,
 		 remote_token, local_id, remote_id);
 	subflow->remote_token = remote_token;
 	WRITE_ONCE(subflow->remote_id, remote_id);
@@ -1751,7 +1751,7 @@ int mptcp_subflow_create_socket(struct sock *sk, unsigned short family,
 	SOCK_INODE(sf)->i_gid = SOCK_INODE(sk->sk_socket)->i_gid;
 
 	subflow = mptcp_subflow_ctx(sf->sk);
-	pr_debug("subflow=%p", subflow);
+	pr_debug("subflow=%p\n", subflow);
 
 	*new_sock = sf;
 	sock_hold(sk);
@@ -1780,7 +1780,7 @@ static struct mptcp_subflow_context *subflow_create_ctx(struct sock *sk,
 	INIT_LIST_HEAD(&ctx->node);
 	INIT_LIST_HEAD(&ctx->delegated_node);
 
-	pr_debug("subflow=%p", ctx);
+	pr_debug("subflow=%p\n", ctx);
 
 	ctx->tcp_sock = sk;
 	WRITE_ONCE(ctx->local_id, -1);
@@ -1931,7 +1931,7 @@ static int subflow_ulp_init(struct sock *sk)
 		goto out;
 	}
 
-	pr_debug("subflow=%p, family=%d", ctx, sk->sk_family);
+	pr_debug("subflow=%p, family=%d\n", ctx, sk->sk_family);
 
 	tp->is_mptcp = 1;
 	ctx->icsk_af_ops = icsk->icsk_af_ops;

-- 
2.45.2

Re: [PATCH net 0/4] mptcp: close subflow when receiving TCP+FIN and misc.

[Jakub Kicinski]

On Mon, 26 Aug 2024 19:11:17 +0200 Matthieu Baerts (NGI0) wrote:
> Matthieu Baerts (NGI0) (4):
>       mptcp: close subflow when receiving TCP+FIN
>       selftests: mptcp: join: cannot rm sf if closed
>       mptcp: sched: check both backup in retrans
>       mptcp: pr_debug: add missing \n at the end

Why are you submitting two series to the same tree at once?
The limit of 15 patches applies, no matter how you post.

Re: [PATCH net 0/4] mptcp: close subflow when receiving TCP+FIN and misc.

[Matthieu Baerts]

On 27/08/2024 05:33, Jakub Kicinski wrote:
> On Mon, 26 Aug 2024 19:11:17 +0200 Matthieu Baerts (NGI0) wrote:
>> Matthieu Baerts (NGI0) (4):
>>       mptcp: close subflow when receiving TCP+FIN
>>       selftests: mptcp: join: cannot rm sf if closed
>>       mptcp: sched: check both backup in retrans
>>       mptcp: pr_debug: add missing \n at the end
> 
> Why are you submitting two series to the same tree at once?
> The limit of 15 patches applies, no matter how you post.

Oh sorry, I didn't know about that.

Recently, we queued a large amount of patches targetting the -net tree,
blocking other patches queued for net-next for a few weeks now. Because
the two series I sent yesterday were not related to each others, I
thought it was OK to send them in parallel. But I understand the rate
limit. I will wait to send the next patches.

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.

Re: [PATCH net 0/4] mptcp: close subflow when receiving TCP+FIN and misc.

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 26 Aug 2024 19:11:17 +0200 you wrote:
> Here are different fixes:
> 
> Patch 1 closes the subflow after having received a FIN, instead of
> leaving it half-closed until the end of the MPTCP connection. A fix for
> v5.12.
> 
> Patch 2 validates the previous patch.
> 
> [...]

Here is the summary with links:
  - [net,1/4] mptcp: close subflow when receiving TCP+FIN
    https://git.kernel.org/netdev/net/c/f09b0ad55a11
  - [net,2/4] selftests: mptcp: join: cannot rm sf if closed
    https://git.kernel.org/netdev/net/c/e93681afcb96
  - [net,3/4] mptcp: sched: check both backup in retrans
    https://git.kernel.org/netdev/net/c/2a1f596ebb23
  - [net,4/4] mptcp: pr_debug: add missing \n at the end
    https://git.kernel.org/netdev/net/c/cb41b195e634

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html