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 } 80