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 } 70