/*
*
* SNMP MIB entries for the IP subsystem.
*
* Alan Cox <gw4pts@gw4pts.ampr.org>
*
* We don't chose to implement SNMP in the kernel (this would
* be silly as SNMP is a pain in the backside in places). We do
* however need to collect the MIB statistics and export them
* out of /proc (eventually)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#ifndef _SNMP_H
#define _SNMP_H
#include <linux/cache.h>
#include <linux/snmp.h>
#include <linux/smp.h>
/*
* Mibs are stored in array of unsigned long.
*/
/*
* struct snmp_mib{}
* - list of entries for particular API (such as /proc/net/snmp)
* - name of entries.
*/
struct snmp_mib {
const char *name;
int entry;
};
#define SNMP_MIB_ITEM(_name,_entry) { \
.name = _name, \
.entry = _entry, \
}
#define SNMP_MIB_SENTINEL { \
.name = NULL, \
.entry = 0, \
}
/*
* We use unsigned longs for most mibs but u64 for ipstats.
*/
#include <linux/u64_stats_sync.h>
/* IPstats */
#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
struct ipstats_mib {
/* mibs[] must be first field of struct ipstats_mib */
u64 mibs[IPSTATS_MIB_MAX];
struct u64_stats_sync syncp;
};
/* ICMP */
#define ICMP_MIB_MAX __ICMP_MIB_MAX
struct icmp_mib {
unsigned long mibs[ICMP_MIB_MAX];
};
#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
struct icmpmsg_mib {
atomic_long_t mibs[ICMPMSG_MIB_MAX];
};
/* ICMP6 (IPv6-ICMP) */
#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
/* per network ns counters */
struct icmpv6_mib {
unsigned long mibs[ICMP6_MIB_MAX];
};
/* per device counters, (shared on all cpus) */
struct icmpv6_mib_device {
atomic_long_t mibs[ICMP6_MIB_MAX];
};
#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
/* per network ns counters */
struct icmpv6msg_mib {
atomic_long_t mibs[ICMP6MSG_MIB_MAX];
};
/* per device counters, (shared on all cpus) */
struct icmpv6msg_mib_device {
atomic_long_t mibs[ICMP6MSG_MIB_MAX];
};
/* TCP */
#define TCP_MIB_MAX __TCP_MIB_MAX
struct tcp_mib {
unsigned long mibs[TCP_MIB_MAX];
};
/* UDP */
#define UDP_MIB_MAX __UDP_MIB_MAX
struct udp_mib {
unsigned long mibs[UDP_MIB_MAX];
};
/* Linux */
#define LINUX_MIB_MAX __LINUX_MIB_MAX
struct linux_mib {
unsigned long mibs[LINUX_MIB_MAX];
};
/* Linux Xfrm */
#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
struct linux_xfrm_mib {
unsigned long mibs[LINUX_MIB_XFRMMAX];
};
#define SNMP_ARRAY_SZ 1
#define DEFINE_SNMP_STAT(type, name) \
__typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
#define DEFINE_SNMP_STAT_ATOMIC(type, name) \
__typeof__(type) *name
#define DECLARE_SNMP_STAT(type, name) \
extern __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
#define SNMP_INC_STATS_BH(mib, field) \
__this_cpu_inc(mib[0]->mibs[field])
#define SNMP_INC_STATS_USER(mib, field) \
this_cpu_inc(mib[0]->mibs[field])
#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
atomic_long_inc(&mib->mibs[field])
#define SNMP_INC_STATS(mib, field) \
this_cpu_inc(mib[0]->mibs[field])
#define SNMP_DEC_STATS(mib, field) \
this_cpu_dec(mib[0]->mibs[field])
#define SNMP_ADD_STATS_BH(mib, field, addend) \
__this_cpu_add(mib[0]->mibs[field], addend)
#define SNMP_ADD_STATS_USER(mib, field, addend) \
this_cpu_add(mib[0]->mibs[field], addend)
#define SNMP_ADD_STATS(mib, field, addend) \
this_cpu_add(mib[0]->mibs[field], addend)
/*
* Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
* to make @ptr a non-percpu pointer.
*/
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
do { \
this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \
this_cpu_add(mib[0]->mibs[basefield##OCTETS], addend); \
} while (0)
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
do { \
__this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \
__this_cpu_add(mib[0]->mibs[basefield##OCTETS], addend); \
} while (0)
#if BITS_PER_LONG==32
#define SNMP_ADD_STATS64_BH(mib, field, addend) \
do { \
__typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \
u64_stats_update_begin(&ptr->syncp); \
ptr->mibs[field] += addend; \
u64_stats_update_end(&ptr->syncp); \
} while (0)
#define SNMP_ADD_STATS64_USER(mib, field, addend) \
do { \
local_bh_disable(); \
SNMP_ADD_STATS64_BH(mib, field, addend); \
local_bh_enable(); \
} while (0)
#define SNMP_ADD_STATS64(mib, field, addend) \
SNMP_ADD_STATS64_USER(mib, field, addend)
#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
do { \
__typeof__(*mib[0]) *ptr; \
ptr = __this_cpu_ptr((mib)[0]); \
u64_stats_update_begin(&ptr->syncp); \
ptr->mibs[basefield##PKTS]++; \
ptr->mibs[basefield##OCTETS] += addend; \
u64_stats_update_end(&ptr->syncp); \
} while (0)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
do { \
local_bh_disable(); \
SNMP_UPD_PO_STATS64_BH(mib, basefield, addend); \
local_bh_enable(); \
} while (0)
#else
#define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
#define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)
#endif
#endif
