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_SENTINEL 31 }; 32 33 /* mptcp_mib_alloc - allocate percpu mib counters 34 * 35 * These are allocated when the first mptcp socket is created so 36 * we do not waste percpu memory if mptcp isn't in use. 37 */ 38 bool mptcp_mib_alloc(struct net *net) 39 { 40 struct mptcp_mib __percpu *mib = alloc_percpu(struct mptcp_mib); 41 42 if (!mib) 43 return false; 44 45 if (cmpxchg(&net->mib.mptcp_statistics, NULL, mib)) 46 free_percpu(mib); 47 48 return true; 49 } 50 51 void mptcp_seq_show(struct seq_file *seq) 52 { 53 struct net *net = seq->private; 54 int i; 55 56 seq_puts(seq, "MPTcpExt:"); 57 for (i = 0; mptcp_snmp_list[i].name; i++) 58 seq_printf(seq, " %s", mptcp_snmp_list[i].name); 59 60 seq_puts(seq, "\nMPTcpExt:"); 61 62 if (!net->mib.mptcp_statistics) { 63 for (i = 0; mptcp_snmp_list[i].name; i++) 64 seq_puts(seq, " 0"); 65 66 return; 67 } 68 69 for (i = 0; mptcp_snmp_list[i].name; i++) 70 seq_printf(seq, " %lu", 71 snmp_fold_field(net->mib.mptcp_statistics, 72 mptcp_snmp_list[i].entry)); 73 seq_putc(seq, '\n'); 74 } 75