1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * 4 * SNMP MIB entries for the IP subsystem. 5 * 6 * Alan Cox <gw4pts@gw4pts.ampr.org> 7 * 8 * We don't chose to implement SNMP in the kernel (this would 9 * be silly as SNMP is a pain in the backside in places). We do 10 * however need to collect the MIB statistics and export them 11 * out of /proc (eventually) 12 */ 13 14 #ifndef _SNMP_H 15 #define _SNMP_H 16 17 #include <linux/cache.h> 18 #include <linux/snmp.h> 19 #include <linux/smp.h> 20 21 /* 22 * Mibs are stored in array of unsigned long. 23 */ 24 /* 25 * struct snmp_mib{} 26 * - list of entries for particular API (such as /proc/net/snmp) 27 * - name of entries. 28 */ 29 struct snmp_mib { 30 const char *name; 31 int entry; 32 }; 33 34 #define SNMP_MIB_ITEM(_name,_entry) { \ 35 .name = _name, \ 36 .entry = _entry, \ 37 } 38 39 /* 40 * We use unsigned longs for most mibs but u64 for ipstats. 41 */ 42 #include <linux/u64_stats_sync.h> 43 44 /* IPstats */ 45 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX 46 struct ipstats_mib { 47 /* mibs[] must be first field of struct ipstats_mib */ 48 u64 mibs[IPSTATS_MIB_MAX]; 49 struct u64_stats_sync syncp; 50 }; 51 52 /* ICMP */ 53 #define ICMP_MIB_MAX __ICMP_MIB_MAX 54 struct icmp_mib { 55 unsigned long mibs[ICMP_MIB_MAX]; 56 }; 57 58 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 59 struct icmpmsg_mib { 60 atomic_long_t mibs[ICMPMSG_MIB_MAX]; 61 }; 62 63 /* ICMP6 (IPv6-ICMP) */ 64 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX 65 /* per network ns counters */ 66 struct icmpv6_mib { 67 unsigned long mibs[ICMP6_MIB_MAX]; 68 }; 69 /* per device counters, (shared on all cpus) */ 70 struct icmpv6_mib_device { 71 atomic_long_t mibs[ICMP6_MIB_MAX]; 72 }; 73 74 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 75 /* per network ns counters */ 76 struct icmpv6msg_mib { 77 atomic_long_t mibs[ICMP6MSG_MIB_MAX]; 78 }; 79 /* per device counters, (shared on all cpus) */ 80 struct icmpv6msg_mib_device { 81 atomic_long_t mibs[ICMP6MSG_MIB_MAX]; 82 }; 83 84 85 /* TCP */ 86 #define TCP_MIB_MAX __TCP_MIB_MAX 87 struct tcp_mib { 88 unsigned long mibs[TCP_MIB_MAX]; 89 }; 90 91 /* UDP */ 92 #define UDP_MIB_MAX __UDP_MIB_MAX 93 struct udp_mib { 94 unsigned long mibs[UDP_MIB_MAX]; 95 }; 96 97 /* Linux */ 98 #define LINUX_MIB_MAX __LINUX_MIB_MAX 99 struct linux_mib { 100 unsigned long mibs[LINUX_MIB_MAX]; 101 }; 102 103 /* Linux Xfrm */ 104 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX 105 struct linux_xfrm_mib { 106 unsigned long mibs[LINUX_MIB_XFRMMAX]; 107 }; 108 109 /* Linux TLS */ 110 #define LINUX_MIB_TLSMAX __LINUX_MIB_TLSMAX 111 struct linux_tls_mib { 112 unsigned long mibs[LINUX_MIB_TLSMAX]; 113 }; 114 115 #define DEFINE_SNMP_STAT(type, name) \ 116 __typeof__(type) __percpu *name 117 #define DEFINE_SNMP_STAT_ATOMIC(type, name) \ 118 __typeof__(type) *name 119 #define DECLARE_SNMP_STAT(type, name) \ 120 extern __typeof__(type) __percpu *name 121 122 #define __SNMP_INC_STATS(mib, field) \ 123 __this_cpu_inc(mib->mibs[field]) 124 125 #define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \ 126 atomic_long_inc(&mib->mibs[field]) 127 128 #define SNMP_INC_STATS(mib, field) \ 129 this_cpu_inc(mib->mibs[field]) 130 131 #define SNMP_DEC_STATS(mib, field) \ 132 this_cpu_dec(mib->mibs[field]) 133 134 #define __SNMP_ADD_STATS(mib, field, addend) \ 135 __this_cpu_add(mib->mibs[field], addend) 136 137 #define SNMP_ADD_STATS(mib, field, addend) \ 138 this_cpu_add(mib->mibs[field], addend) 139 #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ 140 do { \ 141 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ 142 this_cpu_inc(ptr[basefield##PKTS]); \ 143 this_cpu_add(ptr[basefield##OCTETS], addend); \ 144 } while (0) 145 #define __SNMP_UPD_PO_STATS(mib, basefield, addend) \ 146 do { \ 147 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ 148 __this_cpu_inc(ptr[basefield##PKTS]); \ 149 __this_cpu_add(ptr[basefield##OCTETS], addend); \ 150 } while (0) 151 152 153 #if BITS_PER_LONG==32 154 155 #define __SNMP_ADD_STATS64(mib, field, addend) \ 156 do { \ 157 TYPEOF_UNQUAL(*mib) *ptr = raw_cpu_ptr(mib); \ 158 u64_stats_update_begin(&ptr->syncp); \ 159 ptr->mibs[field] += addend; \ 160 u64_stats_update_end(&ptr->syncp); \ 161 } while (0) 162 163 #define SNMP_ADD_STATS64(mib, field, addend) \ 164 do { \ 165 local_bh_disable(); \ 166 __SNMP_ADD_STATS64(mib, field, addend); \ 167 local_bh_enable(); \ 168 } while (0) 169 170 #define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) 171 #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) 172 #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) \ 173 do { \ 174 TYPEOF_UNQUAL(*mib) *ptr = raw_cpu_ptr(mib); \ 175 u64_stats_update_begin(&ptr->syncp); \ 176 ptr->mibs[basefield##PKTS]++; \ 177 ptr->mibs[basefield##OCTETS] += addend; \ 178 u64_stats_update_end(&ptr->syncp); \ 179 } while (0) 180 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) \ 181 do { \ 182 local_bh_disable(); \ 183 __SNMP_UPD_PO_STATS64(mib, basefield, addend); \ 184 local_bh_enable(); \ 185 } while (0) 186 #else 187 #define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field) 188 #define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field) 189 #define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field) 190 #define __SNMP_ADD_STATS64(mib, field, addend) __SNMP_ADD_STATS(mib, field, addend) 191 #define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend) 192 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend) 193 #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend) 194 #endif 195 196 #endif 197