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mptcp: refine opt_mp_capable determination

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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@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Fixes: 74c7dfbee3 ("mptcp: consolidate in_opt sub-options fields in a bitmask")
Link: https://lore.kernel.org/r/20240111194917.4044654-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-01-11 19:49:17 +00:00 committed by Jakub Kicinski
parent 66ff70df1a
commit 724b00c129
1 changed files with 4 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
net/mptcp/subflow.c
View file

@ -157,7 +157,7 @@ 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);
@ -254,7 +254,7 @@ 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;
@ -486,7 +486,7 @@ 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);
@ -783,7 +783,7 @@ 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) {