diff mbox series

[net-next,8/8] mptcp: drop all sub-options except ADD_ADDR when the echo bit is set

Message ID 20210407001604.85071-9-mathew.j.martineau@linux.intel.com
State New
Headers show
Series mptcp: Cleanup, a new test case, and header trimming | expand

Commit Message

Mat Martineau April 7, 2021, 12:16 a.m. UTC 
From: Davide Caratti <dcaratti@redhat.com>

Current Linux carries echo-ed ADD_ADDR over pure TCP ACKs, so there is no
need to add a DSS element that would fit only ADD_ADDR with IPv4 address.
Drop the DSS from echo-ed ADD_ADDR, regardless of the IP version.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
---
 net/mptcp/options.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index c7eb61d0564c..d51c3ad54d9a 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -624,7 +624,8 @@  static bool mptcp_established_options_add_addr(struct sock *sk, struct sk_buff *
 	int len;
 
 	if ((mptcp_pm_should_add_signal_ipv6(msk) ||
-	     mptcp_pm_should_add_signal_port(msk)) &&
+	     mptcp_pm_should_add_signal_port(msk) ||
+	     mptcp_pm_should_add_signal_echo(msk)) &&
 	    skb && skb_is_tcp_pure_ack(skb)) {
 		pr_debug("drop other suboptions");
 		opts->suboptions = 0;