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 #define SNMP_MIB_SENTINEL { \ 40 .name = NULL, \ 41 .entry = 0, \ 42 } 43 44 /* 45 * We use unsigned longs for most mibs but u64 for ipstats. 46 */ 47 #include <linux/u64_stats_sync.h> 48 49 /* IPstats */ 50 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX 51 struct ipstats_mib { 52 /* mibs[] must be first field of struct ipstats_mib */ 53 u64 mibs[IPSTATS_MIB_MAX]; 54 struct u64_stats_sync syncp; 55 }; 56 57 /* ICMP */ 58 #define ICMP_MIB_MAX __ICMP_MIB_MAX 59 struct icmp_mib { 60 unsigned long mibs[ICMP_MIB_MAX]; 61 }; 62 63 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 64 struct icmpmsg_mib { 65 atomic_long_t mibs[ICMPMSG_MIB_MAX]; 66 }; 67 68 /* ICMP6 (IPv6-ICMP) */ 69 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX 70 /* per network ns counters */ 71 struct icmpv6_mib { 72 unsigned long mibs[ICMP6_MIB_MAX]; 73 }; 74 /* per device counters, (shared on all cpus) */ 75 struct icmpv6_mib_device { 76 atomic_long_t mibs[ICMP6_MIB_MAX]; 77 }; 78 79 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 80 /* per network ns counters */ 81 struct icmpv6msg_mib { 82 atomic_long_t mibs[ICMP6MSG_MIB_MAX]; 83 }; 84 /* per device counters, (shared on all cpus) */ 85 struct icmpv6msg_mib_device { 86 atomic_long_t mibs[ICMP6MSG_MIB_MAX]; 87 }; 88 89 90 /* TCP */ 91 #define TCP_MIB_MAX __TCP_MIB_MAX 92 struct tcp_mib { 93 unsigned long mibs[TCP_MIB_MAX]; 94 }; 95 96 /* UDP */ 97 #define UDP_MIB_MAX __UDP_MIB_MAX 98 struct udp_mib { 99 unsigned long mibs[UDP_MIB_MAX]; 100 }; 101 102 /* Linux */ 103 #define LINUX_MIB_MAX __LINUX_MIB_MAX 104 struct linux_mib { 105 unsigned long mibs[LINUX_MIB_MAX]; 106 }; 107 108 /* Linux Xfrm */ 109 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX 110 struct linux_xfrm_mib { 111 unsigned long mibs[LINUX_MIB_XFRMMAX]; 112 }; 113 114 #define DEFINE_SNMP_STAT(type, name) \ 115 __typeof__(type) __percpu *name 116 #define DEFINE_SNMP_STAT_ATOMIC(type, name) \ 117 __typeof__(type) *name 118 #define DECLARE_SNMP_STAT(type, name) \ 119 extern __typeof__(type) __percpu *name 120 121 #define __SNMP_INC_STATS(mib, field) \ 122 __this_cpu_inc(mib->mibs[field]) 123 124 #define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \ 125 atomic_long_inc(&mib->mibs[field]) 126 127 #define SNMP_INC_STATS(mib, field) \ 128 this_cpu_inc(mib->mibs[field]) 129 130 #define SNMP_DEC_STATS(mib, field) \ 131 this_cpu_dec(mib->mibs[field]) 132 133 #define __SNMP_ADD_STATS(mib, field, addend) \ 134 __this_cpu_add(mib->mibs[field], addend) 135 136 #define SNMP_ADD_STATS(mib, field, addend) \ 137 this_cpu_add(mib->mibs[field], addend) 138 #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ 139 do { \ 140 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ 141 this_cpu_inc(ptr[basefield##PKTS]); \ 142 this_cpu_add(ptr[basefield##OCTETS], addend); \ 143 } while (0) 144 #define __SNMP_UPD_PO_STATS(mib, basefield, addend) \ 145 do { \ 146 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ 147 __this_cpu_inc(ptr[basefield##PKTS]); \ 148 __this_cpu_add(ptr[basefield##OCTETS], addend); \ 149 } while (0) 150 151 152 #if BITS_PER_LONG==32 153 154 #define __SNMP_ADD_STATS64(mib, field, addend) \ 155 do { \ 156 __typeof__(*mib) *ptr = raw_cpu_ptr(mib); \ 157 u64_stats_update_begin(&ptr->syncp); \ 158 ptr->mibs[field] += addend; \ 159 u64_stats_update_end(&ptr->syncp); \ 160 } while (0) 161 162 #define SNMP_ADD_STATS64(mib, field, addend) \ 163 do { \ 164 local_bh_disable(); \ 165 __SNMP_ADD_STATS64(mib, field, addend); \ 166 local_bh_enable(); \ 167 } while (0) 168 169 #define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) 170 #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) 171 #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) \ 172 do { \ 173 __typeof__(*mib) *ptr; \ 174 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