diff mbox series

[v2,mptcp-next,05/16] mptcp: send out checksum for DSS

Message ID 08ab4ce9f13e954b45d24c9e7842f7a6a9798d54.1617014019.git.geliangtang@gmail.com
State Superseded, archived
Delegated to: Mat Martineau
Headers show
Series data checksum support | expand

Commit Message

Geliang Tang March 29, 2021, 10:54 a.m. UTC 
In mptcp_write_options, If the checksum is enabled, adjust the option
length and send out the data checksum with DSS suboption.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
---
 net/mptcp/options.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 1ea41f9f05f3..0f9abe8ea7cd 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -547,6 +547,7 @@  static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
 	bool ret = false;
 	u64 ack_seq;
 
+	opts->csum_reqd = READ_ONCE(msk->csum_enabled);
 	mpext = skb ? mptcp_get_ext(skb) : NULL;
 
 	if (!skb || (mpext && mpext->use_map) || snd_data_fin_enable) {
@@ -1325,6 +1326,9 @@  void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 			flags |= MPTCP_DSS_HAS_MAP | MPTCP_DSS_DSN64;
 			if (mpext->data_fin)
 				flags |= MPTCP_DSS_DATA_FIN;
+
+			if (opts->csum_reqd)
+				len += TCPOLEN_MPTCP_DSS_CHECKSUM;
 		}
 
 		*ptr++ = mptcp_option(MPTCPOPT_DSS, len, 0, flags);
@@ -1344,8 +1348,13 @@  void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 			ptr += 2;
 			put_unaligned_be32(mpext->subflow_seq, ptr);
 			ptr += 1;
-			put_unaligned_be32(mpext->data_len << 16 |
-					   TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
+			if (opts->csum_reqd) {
+				put_unaligned_be32(mpext->data_len << 16 |
+						   (__force u16)mpext->csum, ptr);
+			} else {
+				put_unaligned_be32(mpext->data_len << 16 |
+						   TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
+			}
 		}
 	}