1// SPDX-License-Identifier: GPL-2.0-or-later
 2
 3#include <linux/seq_file.h>
 4#include <net/ip.h>
 5#include <net/mptcp.h>
 6#include <net/snmp.h>
 7#include <net/net_namespace.h>
 8
 9#include "mib.h"
10
11static const struct snmp_mib mptcp_snmp_list[] = {
12	SNMP_MIB_ITEM("MPCapableSYNRX", MPTCP_MIB_MPCAPABLEPASSIVE),
13	SNMP_MIB_ITEM("MPCapableACKRX", MPTCP_MIB_MPCAPABLEPASSIVEACK),
14	SNMP_MIB_ITEM("MPCapableFallbackACK", MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK),
15	SNMP_MIB_ITEM("MPCapableFallbackSYNACK", MPTCP_MIB_MPCAPABLEACTIVEFALLBACK),
16	SNMP_MIB_ITEM("MPTCPRetrans", MPTCP_MIB_RETRANSSEGS),
17	SNMP_MIB_ITEM("MPJoinNoTokenFound", MPTCP_MIB_JOINNOTOKEN),
18	SNMP_MIB_ITEM("MPJoinSynRx", MPTCP_MIB_JOINSYNRX),
19	SNMP_MIB_ITEM("MPJoinSynAckRx", MPTCP_MIB_JOINSYNACKRX),
20	SNMP_MIB_ITEM("MPJoinSynAckHMacFailure", MPTCP_MIB_JOINSYNACKMAC),
21	SNMP_MIB_ITEM("MPJoinAckRx", MPTCP_MIB_JOINACKRX),
22	SNMP_MIB_ITEM("MPJoinAckHMacFailure", MPTCP_MIB_JOINACKMAC),
23	SNMP_MIB_ITEM("DSSNotMatching", MPTCP_MIB_DSSNOMATCH),
24	SNMP_MIB_ITEM("InfiniteMapRx", MPTCP_MIB_INFINITEMAPRX),
25	SNMP_MIB_SENTINEL
26};
27
28/* mptcp_mib_alloc - allocate percpu mib counters
29 *
30 * These are allocated when the first mptcp socket is created so
31 * we do not waste percpu memory if mptcp isn't in use.
32 */
33bool mptcp_mib_alloc(struct net *net)
34{
35	struct mptcp_mib __percpu *mib = alloc_percpu(struct mptcp_mib);
36
37	if (!mib)
38		return false;
39
40	if (cmpxchg(&net->mib.mptcp_statistics, NULL, mib))
41		free_percpu(mib);
42
43	return true;
44}
45
46void mptcp_seq_show(struct seq_file *seq)
47{
48	struct net *net = seq->private;
49	int i;
50
51	seq_puts(seq, "MPTcpExt:");
52	for (i = 0; mptcp_snmp_list[i].name; i++)
53		seq_printf(seq, " %s", mptcp_snmp_list[i].name);
54
55	seq_puts(seq, "\nMPTcpExt:");
56
57	if (!net->mib.mptcp_statistics) {
58		for (i = 0; mptcp_snmp_list[i].name; i++)
59			seq_puts(seq, " 0");
60
61		return;
62	}
63
64	for (i = 0; mptcp_snmp_list[i].name; i++)
65		seq_printf(seq, " %lu",
66			   snmp_fold_field(net->mib.mptcp_statistics,
67					   mptcp_snmp_list[i].entry));
68	seq_putc(seq, '\n');
69}