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mptcp: implement fastclose xmit path 

Allow the MPTCP xmit path to add MP_FASTCLOSE suboption
on RST egress packets.

Additionally reorder related options writing to reduce
the number of conditionals required in the fast path.

Co-developed-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.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:
Paolo Abeni 2022-01-06 16:20:15 -08:00 committed by David S. Miller
parent 58cd405b83
commit f284c0c773
2 changed files with 46 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
net/mptcp/options.c
View File

@ -768,6 +768,28 @@ static noinline bool mptcp_established_options_rst(struct sock *sk, struct sk_bu
return true;
}
static bool mptcp_established_options_fastclose(struct sock *sk,
unsigned int *size,
unsigned int remaining,
struct mptcp_out_options *opts)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct mptcp_sock *msk = mptcp_sk(subflow->conn);
if (likely(!subflow->send_fastclose))
return false;
if (remaining < TCPOLEN_MPTCP_FASTCLOSE)
return false;
*size = TCPOLEN_MPTCP_FASTCLOSE;
opts->suboptions |= OPTION_MPTCP_FASTCLOSE;
opts->rcvr_key = msk->remote_key;
pr_debug("FASTCLOSE key=%llu", opts->rcvr_key);
return true;
}
static bool mptcp_established_options_mp_fail(struct sock *sk,
unsigned int *size,
unsigned int remaining,
@ -806,10 +828,12 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
return false;
if (unlikely(skb && TCP_SKB_CB(skb)->tcp_flags & TCPHDR_RST)) {
if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
if (mptcp_established_options_fastclose(sk, &opt_size, remaining, opts) ||
mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
*size += opt_size;
remaining -= opt_size;
}
/* MP_RST can be used with MP_FASTCLOSE and MP_FAIL if there is room */
if (mptcp_established_options_rst(sk, skb, &opt_size, remaining, opts)) {
*size += opt_size;
remaining -= opt_size;
@ -1251,17 +1275,8 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
ptr += 2;
}
/* RST is mutually exclusive with everything else */
if (unlikely(OPTION_MPTCP_RST & opts->suboptions)) {
*ptr++ = mptcp_option(MPTCPOPT_RST,
TCPOLEN_MPTCP_RST,
opts->reset_transient,
opts->reset_reason);
return;
}
/* DSS, MPC, MPJ and ADD_ADDR are mutually exclusive, see
* mptcp_established_options*()
/* DSS, MPC, MPJ, ADD_ADDR, FASTCLOSE and RST are mutually exclusive,
* see mptcp_established_options*()
*/
if (likely(OPTION_MPTCP_DSS & opts->suboptions)) {
struct mptcp_ext *mpext = &opts->ext_copy;
@ -1447,6 +1462,24 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
ptr += 1;
}
}
} else if (unlikely(OPTION_MPTCP_FASTCLOSE & opts->suboptions)) {
/* FASTCLOSE is mutually exclusive with others except RST */
*ptr++ = mptcp_option(MPTCPOPT_MP_FASTCLOSE,
TCPOLEN_MPTCP_FASTCLOSE,
0, 0);
put_unaligned_be64(opts->rcvr_key, ptr);
ptr += 2;
if (OPTION_MPTCP_RST & opts->suboptions)
goto mp_rst;
return;
} else if (unlikely(OPTION_MPTCP_RST & opts->suboptions)) {
mp_rst:
*ptr++ = mptcp_option(MPTCPOPT_RST,
TCPOLEN_MPTCP_RST,
opts->reset_transient,
opts->reset_reason);
return;
}
if (OPTION_MPTCP_PRIO & opts->suboptions) {

1
net/mptcp/protocol.h
View File

@ -423,6 +423,7 @@ struct mptcp_subflow_context {
backup : 1,
send_mp_prio : 1,
send_mp_fail : 1,
send_fastclose : 1,
rx_eof : 1,
can_ack : 1, /* only after processing the remote a key */
disposable : 1, /* ctx can be free at ulp release time */