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[v4,mptcp-next,07/22] mptcp: send out checksum for DSS

Message ID 275afcc53246d0c673e7c6d83f3b974364614799.1619189145.git.pabeni@redhat.com
State Superseded, archived
Delegated to: Mat Martineau
Headers show
Series mptcp: data checksum support | expand

Commit Message

Paolo Abeni April 23, 2021, 2:49 p.m. UTC 
From: Geliang Tang <geliangtang@gmail.com>

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 814fc43ee97b..01caff4cdd25 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -549,6 +549,7 @@  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) {
@@ -1331,6 +1332,9 @@  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);
@@ -1350,8 +1354,13 @@  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);
+			}
 		}
 	}