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authorMatthieu Baerts <matthieu.baerts@tessares.net>2022-02-03 04:03:38 +0300
committerDavid S. Miller <davem@davemloft.net>2022-02-03 14:44:08 +0300
commit902c8f8648828c9293533cc54393f163fb594d06 (patch)
tree37574f8d10ef3031e667a16cbcc45096fa7a97a5 /net/mptcp
parentd7889cfa0b892dfe2a44f72c866ddf41ca19f048 (diff)
downloadlinux-902c8f8648828c9293533cc54393f163fb594d06.tar.xz
mptcp: reduce branching when writing MP_FAIL option
MP_FAIL should be use in very rare cases, either when the TCP RST flag is set -- with or without an MP_RST -- or with a DSS, see mptcp_established_options(). Here, we do the same in mptcp_write_options(). Co-developed-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/options.c30
1 files changed, 19 insertions, 11 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 5d0b3c3e4655..ab054c389a5f 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1267,17 +1267,6 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
const struct sock *ssk = (const struct sock *)tp;
struct mptcp_subflow_context *subflow;
- if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions)) {
- subflow = mptcp_subflow_ctx(ssk);
- subflow->send_mp_fail = 0;
-
- *ptr++ = mptcp_option(MPTCPOPT_MP_FAIL,
- TCPOLEN_MPTCP_FAIL,
- 0, 0);
- put_unaligned_be64(opts->fail_seq, ptr);
- ptr += 2;
- }
-
/* DSS, MPC, MPJ, ADD_ADDR, FASTCLOSE and RST are mutually exclusive,
* see mptcp_established_options*()
*/
@@ -1336,6 +1325,10 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
}
ptr += 1;
}
+
+ /* We might need to add MP_FAIL options in rare cases */
+ if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions))
+ goto mp_fail;
} else if (OPTIONS_MPTCP_MPC & opts->suboptions) {
u8 len, flag = MPTCP_CAP_HMAC_SHA256;
@@ -1479,6 +1472,21 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
if (OPTION_MPTCP_RST & opts->suboptions)
goto mp_rst;
return;
+ } else if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions)) {
+mp_fail:
+ /* MP_FAIL is mutually exclusive with others except RST */
+ subflow = mptcp_subflow_ctx(ssk);
+ subflow->send_mp_fail = 0;
+
+ *ptr++ = mptcp_option(MPTCPOPT_MP_FAIL,
+ TCPOLEN_MPTCP_FAIL,
+ 0, 0);
+ put_unaligned_be64(opts->fail_seq, 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,