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_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  */
  33 bool 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
  46 void 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 }