include/net/snmp.h

   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  */
  34 struct 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
  56 struct 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
  64 struct icmp_mib {
  65         unsigned long   mibs[ICMP_MIB_MAX];
  66 };
  67
  68 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
  69 struct 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 */
  76 struct icmpv6_mib {
  77         unsigned long   mibs[ICMP6_MIB_MAX];
  78 };
  79 /* per device counters, (shared on all cpus) */
  80 struct 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 */
  86 struct icmpv6msg_mib {
  87         atomic_long_t   mibs[ICMP6MSG_MIB_MAX];
  88 };
  89 /* per device counters, (shared on all cpus) */
  90 struct icmpv6msg_mib_device {
  91         atomic_long_t   mibs[ICMP6MSG_MIB_MAX];
  92 };
  93
  94
  95 /* TCP */
  96 #define TCP_MIB_MAX     __TCP_MIB_MAX
  97 struct tcp_mib {
  98         unsigned long   mibs[TCP_MIB_MAX];
  99 };
 100
 101 /* UDP */
 102 #define UDP_MIB_MAX     __UDP_MIB_MAX
 103 struct udp_mib {
 104         unsigned long   mibs[UDP_MIB_MAX];
 105 };
 106
 107 /* Linux */
 108 #define LINUX_MIB_MAX   __LINUX_MIB_MAX
 109 struct linux_mib {
 110         unsigned long   mibs[LINUX_MIB_MAX];
 111 };
 112
 113 /* Linux Xfrm */
 114 #define LINUX_MIB_XFRMMAX       __LINUX_MIB_XFRMMAX
 115 struct linux_xfrm_mib {
 116         unsigned long   mibs[LINUX_MIB_XFRMMAX];
 117 };
 118
 119 #define DEFINE_SNMP_STAT(type, name)    \
 120         __typeof__(type) __percpu *name
 121 #define DEFINE_SNMP_STAT_ATOMIC(type, name)     \
 122         __typeof__(type) *name
 123 #define DECLARE_SNMP_STAT(type, name)   \
 124         extern __typeof__(type) __percpu *name
 125
 126 #define __SNMP_INC_STATS(mib, field)    \
 127                         __this_cpu_inc(mib->mibs[field])
 128
 129 #define SNMP_INC_STATS_ATOMIC_LONG(mib, field)  \
 130                         atomic_long_inc(&mib->mibs[field])
 131
 132 #define SNMP_INC_STATS(mib, field)      \
 133                         this_cpu_inc(mib->mibs[field])
 134
 135 #define SNMP_DEC_STATS(mib, field)      \
 136                         this_cpu_dec(mib->mibs[field])
 137
 138 #define __SNMP_ADD_STATS(mib, field, addend)    \
 139                         __this_cpu_add(mib->mibs[field], addend)
 140
 141 #define SNMP_ADD_STATS(mib, field, addend)      \
 142                         this_cpu_add(mib->mibs[field], addend)
 143 #define SNMP_UPD_PO_STATS(mib, basefield, addend)       \
 144         do { \
 145                 __typeof__((mib->mibs) + 0) ptr = mib->mibs;    \
 146                 this_cpu_inc(ptr[basefield##PKTS]);             \
 147                 this_cpu_add(ptr[basefield##OCTETS], addend);   \
 148         } while (0)
 149 #define __SNMP_UPD_PO_STATS(mib, basefield, addend)     \
 150         do { \
 151                 __typeof__((mib->mibs) + 0) ptr = mib->mibs;    \
 152                 __this_cpu_inc(ptr[basefield##PKTS]);           \
 153                 __this_cpu_add(ptr[basefield##OCTETS], addend); \
 154         } while (0)
 155
 156
 157 #if BITS_PER_LONG==32
 158
 159 #define __SNMP_ADD_STATS64(mib, field, addend)                          \
 160         do {                                                            \
 161                 __typeof__(*mib) *ptr = raw_cpu_ptr(mib);               \
 162                 u64_stats_update_begin(&ptr->syncp);                    \
 163                 ptr->mibs[field] += addend;                             \
 164                 u64_stats_update_end(&ptr->syncp);                      \
 165         } while (0)
 166
 167 #define SNMP_ADD_STATS64(mib, field, addend)                            \
 168         do {                                                            \
 169                 local_bh_disable();                                     \
 170                 __SNMP_ADD_STATS64(mib, field, addend);                 \
 171                 local_bh_enable();                              \
 172         } while (0)
 173
 174 #define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
 175 #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
 176 #define __SNMP_UPD_PO_STATS64(mib, basefield, addend)                   \
 177         do {                                                            \
 178                 __typeof__(*mib) *ptr;                          \
 179                 ptr = raw_cpu_ptr((mib));                               \
 180                 u64_stats_update_begin(&ptr->syncp);                    \
 181                 ptr->mibs[basefield##PKTS]++;                           \
 182                 ptr->mibs[basefield##OCTETS] += addend;                 \
 183                 u64_stats_update_end(&ptr->syncp);                      \
 184         } while (0)
 185 #define SNMP_UPD_PO_STATS64(mib, basefield, addend)                     \
 186         do {                                                            \
 187                 local_bh_disable();                                     \
 188                 __SNMP_UPD_PO_STATS64(mib, basefield, addend);          \
 189                 local_bh_enable();                              \
 190         } while (0)
 191 #else
 192 #define __SNMP_INC_STATS64(mib, field)          __SNMP_INC_STATS(mib, field)
 193 #define SNMP_INC_STATS64(mib, field)            SNMP_INC_STATS(mib, field)
 194 #define SNMP_DEC_STATS64(mib, field)            SNMP_DEC_STATS(mib, field)
 195 #define __SNMP_ADD_STATS64(mib, field, addend)  __SNMP_ADD_STATS(mib, field, addend)
 196 #define SNMP_ADD_STATS64(mib, field, addend)    SNMP_ADD_STATS(mib, field, addend)
 197 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
 198 #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend)
 199 #endif
 200
 201 #endif