net/mptcp/mib.c

   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  */
  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
  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 }