This is a note to let you know that I've just added the patch titled
mptcp: refine opt_mp_capable determination
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptcp-refine-opt_mp_capable-determination.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 203761d6e84365f5c3579f02217d72ccc0a9329d
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Thu Jan 11 19:49:17 2024 +0000
mptcp: refine opt_mp_capable determination
[ Upstream commit 724b00c12957973656d312dce2a110c75ae2c680 ]
OPTIONS_MPTCP_MPC is a combination of three flags.
It would be better to be strict about testing what
flag is expected, at least for code readability.
mptcp_parse_option() already makes the distinction.
- subflow_check_req() should use OPTION_MPTCP_MPC_SYN.
- mptcp_subflow_init_cookie_req() should use OPTION_MPTCP_MPC_ACK.
- subflow_finish_connect() should use OPTION_MPTCP_MPC_SYNACK
- subflow_syn_recv_sock should use OPTION_MPTCP_MPC_ACK
Suggested-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Acked-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Reviewed-by: Mat Martineau <martineau@xxxxxxxxxx>
Fixes: 74c7dfbee3e1 ("mptcp: consolidate in_opt sub-options fields in a bitmask")
Link: https://lore.kernel.org/r/20240111194917.4044654-6-edumazet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 95cd4f6d83e6..f0ebf39db6cc 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -156,7 +156,7 @@ static int subflow_check_req(struct request_sock *req,
mptcp_get_options(skb, &mp_opt);
- opt_mp_capable = !!(mp_opt.suboptions & OPTIONS_MPTCP_MPC);
+ opt_mp_capable = !!(mp_opt.suboptions & OPTION_MPTCP_MPC_SYN);
opt_mp_join = !!(mp_opt.suboptions & OPTION_MPTCP_MPJ_SYN);
if (opt_mp_capable) {
SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_MPCAPABLEPASSIVE);
@@ -253,7 +253,7 @@ int mptcp_subflow_init_cookie_req(struct request_sock *req,
subflow_init_req(req, sk_listener);
mptcp_get_options(skb, &mp_opt);
- opt_mp_capable = !!(mp_opt.suboptions & OPTIONS_MPTCP_MPC);
+ opt_mp_capable = !!(mp_opt.suboptions & OPTION_MPTCP_MPC_ACK);
opt_mp_join = !!(mp_opt.suboptions & OPTION_MPTCP_MPJ_ACK);
if (opt_mp_capable && opt_mp_join)
return -EINVAL;
@@ -415,7 +415,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
mptcp_get_options(skb, &mp_opt);
if (subflow->request_mptcp) {
- if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPC)) {
+ if (!(mp_opt.suboptions & OPTION_MPTCP_MPC_SYNACK)) {
MPTCP_INC_STATS(sock_net(sk),
MPTCP_MIB_MPCAPABLEACTIVEFALLBACK);
mptcp_do_fallback(sk);
@@ -713,7 +713,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
* options.
*/
mptcp_get_options(skb, &mp_opt);
- if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPC))
+ if (!(mp_opt.suboptions & OPTION_MPTCP_MPC_ACK))
fallback = true;
} else if (subflow_req->mp_join) {
