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
11 static 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_ITEM("OFOQueueTail", MPTCP_MIB_OFOQUEUETAIL),
26 SNMP_MIB_ITEM("OFOQueue", MPTCP_MIB_OFOQUEUE),
27 SNMP_MIB_ITEM("OFOMerge", MPTCP_MIB_OFOMERGE),
28 SNMP_MIB_ITEM("NoDSSInWindow", MPTCP_MIB_NODSSWINDOW),
29 SNMP_MIB_ITEM("DuplicateData", MPTCP_MIB_DUPDATA),
30 SNMP_MIB_ITEM("AddAddr", MPTCP_MIB_ADDADDR),
31 SNMP_MIB_ITEM("EchoAdd", MPTCP_MIB_ECHOADD),
32 SNMP_MIB_ITEM("RmAddr", MPTCP_MIB_RMADDR),
33 SNMP_MIB_ITEM("RmSubflow", MPTCP_MIB_RMSUBFLOW),
34 SNMP_MIB_SENTINEL
35 };
36
37 /* mptcp_mib_alloc - allocate percpu mib counters
38 *
39 * These are allocated when the first mptcp socket is created so
40 * we do not waste percpu memory if mptcp isn't in use.
41 */
mptcp_mib_alloc(struct net * net)42 bool mptcp_mib_alloc(struct net *net)
43 {
44 struct mptcp_mib __percpu *mib = alloc_percpu(struct mptcp_mib);
45
46 if (!mib)
47 return false;
48
49 if (cmpxchg(&net->mib.mptcp_statistics, NULL, mib))
50 free_percpu(mib);
51
52 return true;
53 }
54
mptcp_seq_show(struct seq_file * seq)55 void mptcp_seq_show(struct seq_file *seq)
56 {
57 struct net *net = seq->private;
58 int i;
59
60 seq_puts(seq, "MPTcpExt:");
61 for (i = 0; mptcp_snmp_list[i].name; i++)
62 seq_printf(seq, " %s", mptcp_snmp_list[i].name);
63
64 seq_puts(seq, "\nMPTcpExt:");
65
66 if (!net->mib.mptcp_statistics) {
67 for (i = 0; mptcp_snmp_list[i].name; i++)
68 seq_puts(seq, " 0");
69
70 seq_putc(seq, '\n');
71 return;
72 }
73
74 for (i = 0; mptcp_snmp_list[i].name; i++)
75 seq_printf(seq, " %lu",
76 snmp_fold_field(net->mib.mptcp_statistics,
77 mptcp_snmp_list[i].entry));
78 seq_putc(seq, '\n');
79 }
80
