[PATCH net-next 05/16] mptcp: send out checksum for DSS
From: Mat Martineau <hidden>
Date: 2021-06-17 23:46:39
Also in:
mptcp
Subsystem:
networking [general], networking [mptcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Matthieu Baerts, Mat Martineau, Linus Torvalds
From: Geliang Tang <redacted> In mptcp_write_options, if the checksum is enabled, adjust the option length and send out the data checksum with DSS suboption. Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Geliang Tang <redacted> Signed-off-by: Mat Martineau <redacted> --- net/mptcp/options.c | 28 +++++++++++++++++++++------- 1 file changed, 21 insertions(+), 7 deletions(-)
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index b4da08db1221..1468774f1f87 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c@@ -478,6 +478,9 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb, if (data_len > 0) { len = TCPOLEN_MPTCP_MPC_ACK_DATA; if (opts->csum_reqd) { + /* we need to propagate more info to csum the pseudo hdr */ + opts->ext_copy.data_seq = mpext->data_seq; + opts->ext_copy.subflow_seq = mpext->subflow_seq; opts->ext_copy.csum = mpext->csum; len += TCPOLEN_MPTCP_DSS_CHECKSUM; }
@@ -545,18 +548,21 @@ 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) { - unsigned int map_size; + unsigned int map_size = TCPOLEN_MPTCP_DSS_BASE + TCPOLEN_MPTCP_DSS_MAP64; - map_size = TCPOLEN_MPTCP_DSS_BASE + TCPOLEN_MPTCP_DSS_MAP64; + if (mpext) { + if (opts->csum_reqd) + map_size += TCPOLEN_MPTCP_DSS_CHECKSUM; - remaining -= map_size; - dss_size = map_size; - if (mpext) opts->ext_copy = *mpext; + } + remaining -= map_size; + dss_size = map_size; if (skb && snd_data_fin_enable) mptcp_write_data_fin(subflow, skb, &opts->ext_copy); ret = true;
@@ -1346,6 +1352,9 @@ 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);
@@ -1365,8 +1374,13 @@ 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 | + mptcp_make_csum(mpext), ptr); + } else { + put_unaligned_be32(mpext->data_len << 16 | + TCPOPT_NOP << 8 | TCPOPT_NOP, ptr); + } } }
--
2.32.0