1/* 2 * 3 * SNMP MIB entries for the IP subsystem. 4 * 5 * Alan Cox <gw4pts@gw4pts.ampr.org> 6 * 7 * We don't chose to implement SNMP in the kernel (this would 8 * be silly as SNMP is a pain in the backside in places). We do 9 * however need to collect the MIB statistics and export them 10 * out of /proc (eventually) 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 */ 18 19#ifndef _SNMP_H 20#define _SNMP_H 21 22#include <linux/cache.h> 23#include <linux/snmp.h> 24#include <linux/smp.h> 25 26/* 27 * Mibs are stored in array of unsigned long. 28 */ 29/* 30 * struct snmp_mib{} 31 * - list of entries for particular API (such as /proc/net/snmp) 32 * - name of entries. 33 */ 34struct snmp_mib { 35 const char *name; 36 int entry; 37}; 38 39#define SNMP_MIB_ITEM(_name,_entry) { \ 40 .name = _name, \ 41 .entry = _entry, \ 42} 43 44#define SNMP_MIB_SENTINEL { \ 45 .name = NULL, \ 46 .entry = 0, \ 47} 48 49/* 50 * We use unsigned longs for most mibs but u64 for ipstats. 51 */ 52#include <linux/u64_stats_sync.h> 53 54/* IPstats */ 55#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX 56struct ipstats_mib { 57 /* mibs[] must be first field of struct ipstats_mib */ 58 u64 mibs[IPSTATS_MIB_MAX]; 59 struct u64_stats_sync syncp; 60}; 61 62/* ICMP */ 63#define ICMP_MIB_DUMMY __ICMP_MIB_MAX 64#define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1) 65 66struct icmp_mib { 67 unsigned long mibs[ICMP_MIB_MAX]; 68}; 69 70#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 71struct icmpmsg_mib { 72 unsigned long mibs[ICMPMSG_MIB_MAX]; 73}; 74 75/* ICMP6 (IPv6-ICMP) */ 76#define ICMP6_MIB_MAX __ICMP6_MIB_MAX 77struct icmpv6_mib { 78 unsigned long mibs[ICMP6_MIB_MAX]; 79}; 80 81#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 82struct icmpv6msg_mib { 83 unsigned long mibs[ICMP6MSG_MIB_MAX]; 84}; 85 86 87/* TCP */ 88#define TCP_MIB_MAX __TCP_MIB_MAX 89struct tcp_mib { 90 unsigned long mibs[TCP_MIB_MAX]; 91}; 92 93/* UDP */ 94#define UDP_MIB_MAX __UDP_MIB_MAX 95struct udp_mib { 96 unsigned long mibs[UDP_MIB_MAX]; 97}; 98 99/* Linux */ 100#define LINUX_MIB_MAX __LINUX_MIB_MAX 101struct linux_mib { 102 unsigned long mibs[LINUX_MIB_MAX]; 103}; 104 105/* Linux Xfrm */ 106#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX 107struct linux_xfrm_mib { 108 unsigned long mibs[LINUX_MIB_XFRMMAX]; 109}; 110 111#define DEFINE_SNMP_STAT(type, name) \ 112 __typeof__(type) __percpu *name[2] 113#define DECLARE_SNMP_STAT(type, name) \ 114 extern __typeof__(type) __percpu *name[2] 115 116#define SNMP_STAT_BHPTR(name) (name[0]) 117#define SNMP_STAT_USRPTR(name) (name[1]) 118 119#define SNMP_INC_STATS_BH(mib, field) \ 120 __this_cpu_inc(mib[0]->mibs[field]) 121#define SNMP_INC_STATS_USER(mib, field) \ 122 this_cpu_inc(mib[1]->mibs[field]) 123#define SNMP_INC_STATS(mib, field) \ 124 this_cpu_inc(mib[!in_softirq()]->mibs[field]) 125#define SNMP_DEC_STATS(mib, field) \ 126 this_cpu_dec(mib[!in_softirq()]->mibs[field]) 127#define SNMP_ADD_STATS_BH(mib, field, addend) \ 128 __this_cpu_add(mib[0]->mibs[field], addend) 129#define SNMP_ADD_STATS_USER(mib, field, addend) \ 130 this_cpu_add(mib[1]->mibs[field], addend) 131#define SNMP_ADD_STATS(mib, field, addend) \ 132 this_cpu_add(mib[!in_softirq()]->mibs[field], addend) 133/* 134 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr" 135 * to make @ptr a non-percpu pointer. 136 */ 137#define SNMP_UPD_PO_STATS(mib, basefield, addend) \ 138 do { \ 139 __typeof__(*mib[0]) *ptr; \ 140 preempt_disable(); \ 141 ptr = this_cpu_ptr((mib)[!in_softirq()]); \ 142 ptr->mibs[basefield##PKTS]++; \ 143 ptr->mibs[basefield##OCTETS] += addend;\ 144 preempt_enable(); \ 145 } while (0) 146#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \ 147 do { \ 148 __typeof__(*mib[0]) *ptr = \ 149 __this_cpu_ptr((mib)[!in_softirq()]); \ 150 ptr->mibs[basefield##PKTS]++; \ 151 ptr->mibs[basefield##OCTETS] += addend;\ 152 } while (0) 153 154 155#if BITS_PER_LONG==32 156 157#define SNMP_ADD_STATS64_BH(mib, field, addend) \ 158 do { \ 159 __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \ 160 u64_stats_update_begin(&ptr->syncp); \ 161 ptr->mibs[field] += addend; \ 162 u64_stats_update_end(&ptr->syncp); \ 163 } while (0) 164#define SNMP_ADD_STATS64_USER(mib, field, addend) \ 165 do { \ 166 __typeof__(*mib[0]) *ptr; \ 167 preempt_disable(); \ 168 ptr = __this_cpu_ptr((mib)[1]); \ 169 u64_stats_update_begin(&ptr->syncp); \ 170 ptr->mibs[field] += addend; \ 171 u64_stats_update_end(&ptr->syncp); \ 172 preempt_enable(); \ 173 } while (0) 174#define SNMP_ADD_STATS64(mib, field, addend) \ 175 do { \ 176 __typeof__(*mib[0]) *ptr; \ 177 preempt_disable(); \ 178 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ 179 u64_stats_update_begin(&ptr->syncp); \ 180 ptr->mibs[field] += addend; \ 181 u64_stats_update_end(&ptr->syncp); \ 182 preempt_enable(); \ 183 } while (0) 184#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1) 185#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1) 186#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) 187#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \ 188 do { \ 189 __typeof__(*mib[0]) *ptr; \ 190 preempt_disable(); \ 191 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ 192 u64_stats_update_begin(&ptr->syncp); \ 193 ptr->mibs[basefield##PKTS]++; \ 194 ptr->mibs[basefield##OCTETS] += addend; \ 195 u64_stats_update_end(&ptr->syncp); \ 196 preempt_enable(); \ 197 } while (0) 198#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \ 199 do { \ 200 __typeof__(*mib[0]) *ptr; \ 201 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ 202 u64_stats_update_begin(&ptr->syncp); \ 203 ptr->mibs[basefield##PKTS]++; \ 204 ptr->mibs[basefield##OCTETS] += addend; \ 205 u64_stats_update_end(&ptr->syncp); \ 206 } while (0) 207#else 208#define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field) 209#define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field) 210#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field) 211#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field) 212#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend) 213#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend) 214#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend) 215#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend) 216#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend) 217#endif 218 219#endif 220