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6982826fe5
Some middleboxes might be nasty with MPTCP, and decide to drop packets with MPTCP options, instead of just dropping the MPTCP options (or letting them pass...). In this case, it sounds better to fallback to "plain" TCP after 2 retransmissions, and try again. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/477 Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20240909-net-next-mptcp-fallback-x-mpc-v1-2-da7ebb4cd2a3@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
120 lines
4.8 KiB
C
120 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/seq_file.h>
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#include <net/ip.h>
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#include <net/mptcp.h>
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#include <net/snmp.h>
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#include <net/net_namespace.h>
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#include "mib.h"
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static const struct snmp_mib mptcp_snmp_list[] = {
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SNMP_MIB_ITEM("MPCapableSYNRX", MPTCP_MIB_MPCAPABLEPASSIVE),
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SNMP_MIB_ITEM("MPCapableSYNTX", MPTCP_MIB_MPCAPABLEACTIVE),
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SNMP_MIB_ITEM("MPCapableSYNACKRX", MPTCP_MIB_MPCAPABLEACTIVEACK),
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SNMP_MIB_ITEM("MPCapableACKRX", MPTCP_MIB_MPCAPABLEPASSIVEACK),
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SNMP_MIB_ITEM("MPCapableFallbackACK", MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK),
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SNMP_MIB_ITEM("MPCapableFallbackSYNACK", MPTCP_MIB_MPCAPABLEACTIVEFALLBACK),
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SNMP_MIB_ITEM("MPCapableSYNTXDrop", MPTCP_MIB_MPCAPABLEACTIVEDROP),
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SNMP_MIB_ITEM("MPFallbackTokenInit", MPTCP_MIB_TOKENFALLBACKINIT),
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SNMP_MIB_ITEM("MPTCPRetrans", MPTCP_MIB_RETRANSSEGS),
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SNMP_MIB_ITEM("MPJoinNoTokenFound", MPTCP_MIB_JOINNOTOKEN),
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SNMP_MIB_ITEM("MPJoinSynRx", MPTCP_MIB_JOINSYNRX),
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SNMP_MIB_ITEM("MPJoinSynBackupRx", MPTCP_MIB_JOINSYNBACKUPRX),
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SNMP_MIB_ITEM("MPJoinSynAckRx", MPTCP_MIB_JOINSYNACKRX),
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SNMP_MIB_ITEM("MPJoinSynAckBackupRx", MPTCP_MIB_JOINSYNACKBACKUPRX),
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SNMP_MIB_ITEM("MPJoinSynAckHMacFailure", MPTCP_MIB_JOINSYNACKMAC),
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SNMP_MIB_ITEM("MPJoinAckRx", MPTCP_MIB_JOINACKRX),
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SNMP_MIB_ITEM("MPJoinAckHMacFailure", MPTCP_MIB_JOINACKMAC),
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SNMP_MIB_ITEM("MPJoinSynTx", MPTCP_MIB_JOINSYNTX),
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SNMP_MIB_ITEM("MPJoinSynTxCreatSkErr", MPTCP_MIB_JOINSYNTXCREATSKERR),
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SNMP_MIB_ITEM("MPJoinSynTxBindErr", MPTCP_MIB_JOINSYNTXBINDERR),
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SNMP_MIB_ITEM("MPJoinSynTxConnectErr", MPTCP_MIB_JOINSYNTXCONNECTERR),
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SNMP_MIB_ITEM("DSSNotMatching", MPTCP_MIB_DSSNOMATCH),
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SNMP_MIB_ITEM("InfiniteMapTx", MPTCP_MIB_INFINITEMAPTX),
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SNMP_MIB_ITEM("InfiniteMapRx", MPTCP_MIB_INFINITEMAPRX),
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SNMP_MIB_ITEM("DSSNoMatchTCP", MPTCP_MIB_DSSTCPMISMATCH),
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SNMP_MIB_ITEM("DataCsumErr", MPTCP_MIB_DATACSUMERR),
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SNMP_MIB_ITEM("OFOQueueTail", MPTCP_MIB_OFOQUEUETAIL),
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SNMP_MIB_ITEM("OFOQueue", MPTCP_MIB_OFOQUEUE),
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SNMP_MIB_ITEM("OFOMerge", MPTCP_MIB_OFOMERGE),
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SNMP_MIB_ITEM("NoDSSInWindow", MPTCP_MIB_NODSSWINDOW),
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SNMP_MIB_ITEM("DuplicateData", MPTCP_MIB_DUPDATA),
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SNMP_MIB_ITEM("AddAddr", MPTCP_MIB_ADDADDR),
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SNMP_MIB_ITEM("AddAddrTx", MPTCP_MIB_ADDADDRTX),
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SNMP_MIB_ITEM("AddAddrTxDrop", MPTCP_MIB_ADDADDRTXDROP),
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SNMP_MIB_ITEM("EchoAdd", MPTCP_MIB_ECHOADD),
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SNMP_MIB_ITEM("EchoAddTx", MPTCP_MIB_ECHOADDTX),
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SNMP_MIB_ITEM("EchoAddTxDrop", MPTCP_MIB_ECHOADDTXDROP),
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SNMP_MIB_ITEM("PortAdd", MPTCP_MIB_PORTADD),
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SNMP_MIB_ITEM("AddAddrDrop", MPTCP_MIB_ADDADDRDROP),
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SNMP_MIB_ITEM("MPJoinPortSynRx", MPTCP_MIB_JOINPORTSYNRX),
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SNMP_MIB_ITEM("MPJoinPortSynAckRx", MPTCP_MIB_JOINPORTSYNACKRX),
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SNMP_MIB_ITEM("MPJoinPortAckRx", MPTCP_MIB_JOINPORTACKRX),
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SNMP_MIB_ITEM("MismatchPortSynRx", MPTCP_MIB_MISMATCHPORTSYNRX),
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SNMP_MIB_ITEM("MismatchPortAckRx", MPTCP_MIB_MISMATCHPORTACKRX),
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SNMP_MIB_ITEM("RmAddr", MPTCP_MIB_RMADDR),
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SNMP_MIB_ITEM("RmAddrDrop", MPTCP_MIB_RMADDRDROP),
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SNMP_MIB_ITEM("RmAddrTx", MPTCP_MIB_RMADDRTX),
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SNMP_MIB_ITEM("RmAddrTxDrop", MPTCP_MIB_RMADDRTXDROP),
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SNMP_MIB_ITEM("RmSubflow", MPTCP_MIB_RMSUBFLOW),
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SNMP_MIB_ITEM("MPPrioTx", MPTCP_MIB_MPPRIOTX),
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SNMP_MIB_ITEM("MPPrioRx", MPTCP_MIB_MPPRIORX),
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SNMP_MIB_ITEM("MPFailTx", MPTCP_MIB_MPFAILTX),
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SNMP_MIB_ITEM("MPFailRx", MPTCP_MIB_MPFAILRX),
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SNMP_MIB_ITEM("MPFastcloseTx", MPTCP_MIB_MPFASTCLOSETX),
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SNMP_MIB_ITEM("MPFastcloseRx", MPTCP_MIB_MPFASTCLOSERX),
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SNMP_MIB_ITEM("MPRstTx", MPTCP_MIB_MPRSTTX),
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SNMP_MIB_ITEM("MPRstRx", MPTCP_MIB_MPRSTRX),
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SNMP_MIB_ITEM("RcvPruned", MPTCP_MIB_RCVPRUNED),
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SNMP_MIB_ITEM("SubflowStale", MPTCP_MIB_SUBFLOWSTALE),
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SNMP_MIB_ITEM("SubflowRecover", MPTCP_MIB_SUBFLOWRECOVER),
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SNMP_MIB_ITEM("SndWndShared", MPTCP_MIB_SNDWNDSHARED),
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SNMP_MIB_ITEM("RcvWndShared", MPTCP_MIB_RCVWNDSHARED),
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SNMP_MIB_ITEM("RcvWndConflictUpdate", MPTCP_MIB_RCVWNDCONFLICTUPDATE),
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SNMP_MIB_ITEM("RcvWndConflict", MPTCP_MIB_RCVWNDCONFLICT),
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SNMP_MIB_ITEM("MPCurrEstab", MPTCP_MIB_CURRESTAB),
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SNMP_MIB_SENTINEL
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};
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/* mptcp_mib_alloc - allocate percpu mib counters
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*
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* These are allocated when the first mptcp socket is created so
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* we do not waste percpu memory if mptcp isn't in use.
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*/
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bool mptcp_mib_alloc(struct net *net)
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{
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struct mptcp_mib __percpu *mib = alloc_percpu(struct mptcp_mib);
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if (!mib)
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return false;
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if (cmpxchg(&net->mib.mptcp_statistics, NULL, mib))
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free_percpu(mib);
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return true;
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}
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void mptcp_seq_show(struct seq_file *seq)
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{
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unsigned long sum[ARRAY_SIZE(mptcp_snmp_list) - 1];
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struct net *net = seq->private;
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int i;
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seq_puts(seq, "MPTcpExt:");
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for (i = 0; mptcp_snmp_list[i].name; i++)
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seq_printf(seq, " %s", mptcp_snmp_list[i].name);
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seq_puts(seq, "\nMPTcpExt:");
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memset(sum, 0, sizeof(sum));
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if (net->mib.mptcp_statistics)
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snmp_get_cpu_field_batch(sum, mptcp_snmp_list,
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net->mib.mptcp_statistics);
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for (i = 0; mptcp_snmp_list[i].name; i++)
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seq_printf(seq, " %lu", sum[i]);
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seq_putc(seq, '\n');
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}
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