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mptcp: add subflow unique id

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The user-space need to properly account the data received/sent by
individual subflows. When additional subflows are created and/or
closed during the MPTCP socket lifetime, the information currently
exposed via MPTCP_TCPINFO are not enough: subflows are identified only
by the sequential position inside the info dumps, and that will change
with the above mentioned events.

To solve the above problem, this patch introduces a new subflow
identifier that is unique inside the given MPTCP socket scope.

The initial subflow get the id 1 and the other subflows get incremental
values at join time.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/388
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni
2023-06-20 18:30:17 +02:00
committed by Jakub Kicinski
parent 5dcff89e14
commit 6f06b4d4d1
3 changed files with 12 additions and 1 deletions
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5
net/mptcp/protocol.h
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@@ -323,7 +323,8 @@ struct mptcp_sock {
u64 rtt_us; /* last maximum rtt of subflows */
} rcvq_space;
u32 setsockopt_seq;
u32 subflow_id;
u32 setsockopt_seq;
char ca_name[TCP_CA_NAME_MAX];
struct mptcp_sock *dl_next;
};
@@ -504,6 +505,8 @@ struct mptcp_subflow_context {
u8 reset_reason:4;
u8 stale_count;
u32 subflow_id;
long delegated_status;
unsigned long fail_tout;