linux/include/net/snmp.h
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   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_MAX    __ICMP_MIB_MAX
  64struct icmp_mib {
  65        unsigned long   mibs[ICMP_MIB_MAX];
  66};
  67
  68#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
  69struct icmpmsg_mib {
  70        atomic_long_t   mibs[ICMPMSG_MIB_MAX];
  71};
  72
  73/* ICMP6 (IPv6-ICMP) */
  74#define ICMP6_MIB_MAX   __ICMP6_MIB_MAX
  75/* per network ns counters */
  76struct icmpv6_mib {
  77        unsigned long   mibs[ICMP6_MIB_MAX];
  78};
  79/* per device counters, (shared on all cpus) */
  80struct icmpv6_mib_device {
  81        atomic_long_t   mibs[ICMP6_MIB_MAX];
  82};
  83
  84#define ICMP6MSG_MIB_MAX  __ICMP6MSG_MIB_MAX
  85/* per network ns counters */
  86struct icmpv6msg_mib {
  87        atomic_long_t   mibs[ICMP6MSG_MIB_MAX];
  88};
  89/* per device counters, (shared on all cpus) */
  90struct icmpv6msg_mib_device {
  91        atomic_long_t   mibs[ICMP6MSG_MIB_MAX];
  92};
  93
  94
  95/* TCP */
  96#define TCP_MIB_MAX     __TCP_MIB_MAX
  97struct tcp_mib {
  98        unsigned long   mibs[TCP_MIB_MAX];
  99};
 100
 101/* UDP */
 102#define UDP_MIB_MAX     __UDP_MIB_MAX
 103struct udp_mib {
 104        unsigned long   mibs[UDP_MIB_MAX];
 105};
 106
 107/* Linux */
 108#define LINUX_MIB_MAX   __LINUX_MIB_MAX
 109struct linux_mib {
 110        unsigned long   mibs[LINUX_MIB_MAX];
 111};
 112
 113/* Linux Xfrm */
 114#define LINUX_MIB_XFRMMAX       __LINUX_MIB_XFRMMAX
 115struct linux_xfrm_mib {
 116        unsigned long   mibs[LINUX_MIB_XFRMMAX];
 117};
 118
 119#define SNMP_ARRAY_SZ 1
 120
 121#define DEFINE_SNMP_STAT(type, name)    \
 122        __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
 123#define DEFINE_SNMP_STAT_ATOMIC(type, name)     \
 124        __typeof__(type) *name
 125#define DECLARE_SNMP_STAT(type, name)   \
 126        extern __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
 127
 128#define SNMP_INC_STATS_BH(mib, field)   \
 129                        __this_cpu_inc(mib[0]->mibs[field])
 130
 131#define SNMP_INC_STATS_USER(mib, field) \
 132                        this_cpu_inc(mib[0]->mibs[field])
 133
 134#define SNMP_INC_STATS_ATOMIC_LONG(mib, field)  \
 135                        atomic_long_inc(&mib->mibs[field])
 136
 137#define SNMP_INC_STATS(mib, field)      \
 138                        this_cpu_inc(mib[0]->mibs[field])
 139
 140#define SNMP_DEC_STATS(mib, field)      \
 141                        this_cpu_dec(mib[0]->mibs[field])
 142
 143#define SNMP_ADD_STATS_BH(mib, field, addend)   \
 144                        __this_cpu_add(mib[0]->mibs[field], addend)
 145
 146#define SNMP_ADD_STATS_USER(mib, field, addend) \
 147                        this_cpu_add(mib[0]->mibs[field], addend)
 148
 149#define SNMP_ADD_STATS(mib, field, addend)      \
 150                        this_cpu_add(mib[0]->mibs[field], addend)
 151/*
 152 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
 153 * to make @ptr a non-percpu pointer.
 154 */
 155#define SNMP_UPD_PO_STATS(mib, basefield, addend)       \
 156        do { \
 157                __typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs;  \
 158                this_cpu_inc(ptr[basefield##PKTS]);             \
 159                this_cpu_add(ptr[basefield##OCTETS], addend);   \
 160        } while (0)
 161#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend)    \
 162        do { \
 163                __typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs;  \
 164                __this_cpu_inc(ptr[basefield##PKTS]);           \
 165                __this_cpu_add(ptr[basefield##OCTETS], addend); \
 166        } while (0)
 167
 168
 169#if BITS_PER_LONG==32
 170
 171#define SNMP_ADD_STATS64_BH(mib, field, addend)                         \
 172        do {                                                            \
 173                __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]);    \
 174                u64_stats_update_begin(&ptr->syncp);                    \
 175                ptr->mibs[field] += addend;                             \
 176                u64_stats_update_end(&ptr->syncp);                      \
 177        } while (0)
 178
 179#define SNMP_ADD_STATS64_USER(mib, field, addend)                       \
 180        do {                                                            \
 181                local_bh_disable();                                     \
 182                SNMP_ADD_STATS64_BH(mib, field, addend);                \
 183                local_bh_enable();                                      \
 184        } while (0)
 185
 186#define SNMP_ADD_STATS64(mib, field, addend)                            \
 187                SNMP_ADD_STATS64_USER(mib, field, addend)
 188
 189#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
 190#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
 191#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
 192#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend)                  \
 193        do {                                                            \
 194                __typeof__(*mib[0]) *ptr;                               \
 195                ptr = __this_cpu_ptr((mib)[0]);                         \
 196                u64_stats_update_begin(&ptr->syncp);                    \
 197                ptr->mibs[basefield##PKTS]++;                           \
 198                ptr->mibs[basefield##OCTETS] += addend;                 \
 199                u64_stats_update_end(&ptr->syncp);                      \
 200        } while (0)
 201#define SNMP_UPD_PO_STATS64(mib, basefield, addend)                     \
 202        do {                                                            \
 203                local_bh_disable();                                     \
 204                SNMP_UPD_PO_STATS64_BH(mib, basefield, addend);         \
 205                local_bh_enable();                                      \
 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
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