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mptcp: add CurrEstab MIB counter support

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Add a new MIB counter named MPTCP_MIB_CURRESTAB to count current
established MPTCP connections, similar to TCP_MIB_CURRESTAB. This is
useful to quickly list the number of MPTCP connections without having to
iterate over all of them.

This patch adds a new helper function mptcp_set_state(): if the state
switches from or to ESTABLISHED state, this newly added counter is
incremented. This helper is going to be used in the following patch.

Similar to MPTCP_INC_STATS(), a new helper called MPTCP_DEC_STATS() is
also needed to decrement a MIB counter.

Signed-off-by: Geliang Tang <geliang.tang@linux.dev>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2023-12-22 13:47:22 +01:00 committed by David S. Miller
parent 42a7889a19
commit d9cd27b8cd
4 changed files with 28 additions and 0 deletions
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1
net/mptcp/mib.c
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@ -66,6 +66,7 @@ static const struct snmp_mib mptcp_snmp_list[] = {
SNMP_MIB_ITEM("RcvWndShared", MPTCP_MIB_RCVWNDSHARED),
SNMP_MIB_ITEM("RcvWndConflictUpdate", MPTCP_MIB_RCVWNDCONFLICTUPDATE),
SNMP_MIB_ITEM("RcvWndConflict", MPTCP_MIB_RCVWNDCONFLICT),
SNMP_MIB_ITEM("MPCurrEstab", MPTCP_MIB_CURRESTAB),
SNMP_MIB_SENTINEL
};

8
net/mptcp/mib.h
View File

@ -65,6 +65,7 @@ enum linux_mptcp_mib_field {
* conflict with another subflow while updating msk rcv wnd
*/
MPTCP_MIB_RCVWNDCONFLICT, /* Conflict with while updating msk rcv wnd */
MPTCP_MIB_CURRESTAB, /* Current established MPTCP connections */
__MPTCP_MIB_MAX
};
@ -95,4 +96,11 @@ static inline void __MPTCP_INC_STATS(struct net *net,
__SNMP_INC_STATS(net->mib.mptcp_statistics, field);
}
static inline void MPTCP_DEC_STATS(struct net *net,
enum linux_mptcp_mib_field field)
{
if (likely(net->mib.mptcp_statistics))
SNMP_DEC_STATS(net->mib.mptcp_statistics, field);
}
bool mptcp_mib_alloc(struct net *net);

18
net/mptcp/protocol.c
View File

@ -2871,6 +2871,24 @@ void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)
release_sock(ssk);
}
void mptcp_set_state(struct sock *sk, int state)
{
int oldstate = sk->sk_state;
switch (state) {
case TCP_ESTABLISHED:
if (oldstate != TCP_ESTABLISHED)
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
break;
default:
if (oldstate == TCP_ESTABLISHED)
MPTCP_DEC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
}
inet_sk_state_store(sk, state);
}
static const unsigned char new_state[16] = {
/* current state: new state: action: */
[0 /* (Invalid) */] = TCP_CLOSE,

1
net/mptcp/protocol.h
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@ -641,6 +641,7 @@ bool __mptcp_close(struct sock *sk, long timeout);
void mptcp_cancel_work(struct sock *sk);
void __mptcp_unaccepted_force_close(struct sock *sk);
void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk);
void mptcp_set_state(struct sock *sk, int state);
bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
const struct mptcp_addr_info *b, bool use_port);