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("MPCapableSYNTX", MPTCP_MIB_MPCAPABLEACTIVE),
 14	SNMP_MIB_ITEM("MPCapableSYNACKRX", MPTCP_MIB_MPCAPABLEACTIVEACK),
 15	SNMP_MIB_ITEM("MPCapableACKRX", MPTCP_MIB_MPCAPABLEPASSIVEACK),
 16	SNMP_MIB_ITEM("MPCapableFallbackACK", MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK),
 17	SNMP_MIB_ITEM("MPCapableFallbackSYNACK", MPTCP_MIB_MPCAPABLEACTIVEFALLBACK),
 18	SNMP_MIB_ITEM("MPFallbackTokenInit", MPTCP_MIB_TOKENFALLBACKINIT),
 19	SNMP_MIB_ITEM("MPTCPRetrans", MPTCP_MIB_RETRANSSEGS),
 20	SNMP_MIB_ITEM("MPJoinNoTokenFound", MPTCP_MIB_JOINNOTOKEN),
 21	SNMP_MIB_ITEM("MPJoinSynRx", MPTCP_MIB_JOINSYNRX),
 22	SNMP_MIB_ITEM("MPJoinSynAckRx", MPTCP_MIB_JOINSYNACKRX),
 23	SNMP_MIB_ITEM("MPJoinSynAckHMacFailure", MPTCP_MIB_JOINSYNACKMAC),
 24	SNMP_MIB_ITEM("MPJoinAckRx", MPTCP_MIB_JOINACKRX),
 25	SNMP_MIB_ITEM("MPJoinAckHMacFailure", MPTCP_MIB_JOINACKMAC),
 26	SNMP_MIB_ITEM("DSSNotMatching", MPTCP_MIB_DSSNOMATCH),
 27	SNMP_MIB_ITEM("InfiniteMapTx", MPTCP_MIB_INFINITEMAPTX),
 28	SNMP_MIB_ITEM("InfiniteMapRx", MPTCP_MIB_INFINITEMAPRX),
 29	SNMP_MIB_ITEM("DSSNoMatchTCP", MPTCP_MIB_DSSTCPMISMATCH),
 30	SNMP_MIB_ITEM("DataCsumErr", MPTCP_MIB_DATACSUMERR),
 31	SNMP_MIB_ITEM("OFOQueueTail", MPTCP_MIB_OFOQUEUETAIL),
 32	SNMP_MIB_ITEM("OFOQueue", MPTCP_MIB_OFOQUEUE),
 33	SNMP_MIB_ITEM("OFOMerge", MPTCP_MIB_OFOMERGE),
 34	SNMP_MIB_ITEM("NoDSSInWindow", MPTCP_MIB_NODSSWINDOW),
 35	SNMP_MIB_ITEM("DuplicateData", MPTCP_MIB_DUPDATA),
 36	SNMP_MIB_ITEM("AddAddr", MPTCP_MIB_ADDADDR),
 37	SNMP_MIB_ITEM("EchoAdd", MPTCP_MIB_ECHOADD),
 38	SNMP_MIB_ITEM("PortAdd", MPTCP_MIB_PORTADD),
 39	SNMP_MIB_ITEM("AddAddrDrop", MPTCP_MIB_ADDADDRDROP),
 40	SNMP_MIB_ITEM("MPJoinPortSynRx", MPTCP_MIB_JOINPORTSYNRX),
 41	SNMP_MIB_ITEM("MPJoinPortSynAckRx", MPTCP_MIB_JOINPORTSYNACKRX),
 42	SNMP_MIB_ITEM("MPJoinPortAckRx", MPTCP_MIB_JOINPORTACKRX),
 43	SNMP_MIB_ITEM("MismatchPortSynRx", MPTCP_MIB_MISMATCHPORTSYNRX),
 44	SNMP_MIB_ITEM("MismatchPortAckRx", MPTCP_MIB_MISMATCHPORTACKRX),
 45	SNMP_MIB_ITEM("RmAddr", MPTCP_MIB_RMADDR),
 46	SNMP_MIB_ITEM("RmAddrDrop", MPTCP_MIB_RMADDRDROP),
 47	SNMP_MIB_ITEM("RmSubflow", MPTCP_MIB_RMSUBFLOW),
 48	SNMP_MIB_ITEM("MPPrioTx", MPTCP_MIB_MPPRIOTX),
 49	SNMP_MIB_ITEM("MPPrioRx", MPTCP_MIB_MPPRIORX),
 50	SNMP_MIB_ITEM("MPFailTx", MPTCP_MIB_MPFAILTX),
 51	SNMP_MIB_ITEM("MPFailRx", MPTCP_MIB_MPFAILRX),
 52	SNMP_MIB_ITEM("MPFastcloseTx", MPTCP_MIB_MPFASTCLOSETX),
 53	SNMP_MIB_ITEM("MPFastcloseRx", MPTCP_MIB_MPFASTCLOSERX),
 54	SNMP_MIB_ITEM("MPRstTx", MPTCP_MIB_MPRSTTX),
 55	SNMP_MIB_ITEM("MPRstRx", MPTCP_MIB_MPRSTRX),
 56	SNMP_MIB_ITEM("RcvPruned", MPTCP_MIB_RCVPRUNED),
 57	SNMP_MIB_ITEM("SubflowStale", MPTCP_MIB_SUBFLOWSTALE),
 58	SNMP_MIB_ITEM("SubflowRecover", MPTCP_MIB_SUBFLOWRECOVER),
 59	SNMP_MIB_ITEM("SndWndShared", MPTCP_MIB_SNDWNDSHARED),
 60	SNMP_MIB_ITEM("RcvWndShared", MPTCP_MIB_RCVWNDSHARED),
 61	SNMP_MIB_ITEM("RcvWndConflictUpdate", MPTCP_MIB_RCVWNDCONFLICTUPDATE),
 62	SNMP_MIB_ITEM("RcvWndConflict", MPTCP_MIB_RCVWNDCONFLICT),
 63	SNMP_MIB_SENTINEL
 64};
 65
 66/* mptcp_mib_alloc - allocate percpu mib counters
 67 *
 68 * These are allocated when the first mptcp socket is created so
 69 * we do not waste percpu memory if mptcp isn't in use.
 70 */
 71bool mptcp_mib_alloc(struct net *net)
 72{
 73	struct mptcp_mib __percpu *mib = alloc_percpu(struct mptcp_mib);
 74
 75	if (!mib)
 76		return false;
 77
 78	if (cmpxchg(&net->mib.mptcp_statistics, NULL, mib))
 79		free_percpu(mib);
 80
 81	return true;
 82}
 83
 84void mptcp_seq_show(struct seq_file *seq)
 85{
 86	unsigned long sum[ARRAY_SIZE(mptcp_snmp_list) - 1];
 87	struct net *net = seq->private;
 88	int i;
 89
 90	seq_puts(seq, "MPTcpExt:");
 91	for (i = 0; mptcp_snmp_list[i].name; i++)
 92		seq_printf(seq, " %s", mptcp_snmp_list[i].name);
 93
 94	seq_puts(seq, "\nMPTcpExt:");
 95
 96	memset(sum, 0, sizeof(sum));
 97	if (net->mib.mptcp_statistics)
 98		snmp_get_cpu_field_batch(sum, mptcp_snmp_list,
 99					 net->mib.mptcp_statistics);
100
101	for (i = 0; mptcp_snmp_list[i].name; i++)
102		seq_printf(seq, " %lu", sum[i]);
103
104	seq_putc(seq, '\n');
105}