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mptcp: send out checksum for DSS 

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 <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2021-06-17 16:46:11 -07:00 committed by David S. Miller
parent c94b1f96dc
commit c5b39e26d0
1 changed files with 21 additions and 7 deletions
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28
net/mptcp/options.c
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@ -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;
opts->ext_copy = *mpext;
}
remaining -= map_size;
dss_size = map_size;
if (mpext)
opts->ext_copy = *mpext;
if (skb && snd_data_fin_enable)
mptcp_write_data_fin(subflow, skb, &opts->ext_copy);
ret = true;
@ -1346,6 +1352,9 @@ mp_capable_done:
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 @@ mp_capable_done:
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);
}
}
}