/* * *		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_MAXstruct 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_MAXstruct icmp_mib {	unsigned long	mibs[ICMP_MIB_MAX];}; #define ICMPMSG_MIB_MAX	__ICMPMSG_MIB_MAXstruct 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_MAXstruct tcp_mib {	unsigned long	mibs[TCP_MIB_MAX];}; /* UDP */#define UDP_MIB_MAX	__UDP_MIB_MAXstruct udp_mib {	unsigned long	mibs[UDP_MIB_MAX];}; /* Linux */#define LINUX_MIB_MAX	__LINUX_MIB_MAXstruct linux_mib {	unsigned long	mibs[LINUX_MIB_MAX];}; /* Linux Xfrm */#define LINUX_MIB_XFRMMAX	__LINUX_MIB_XFRMMAXstruct linux_xfrm_mib {	unsigned long	mibs[LINUX_MIB_XFRMMAX];}; #define DEFINE_SNMP_STAT(type, name)	\	__typeof__(type) __percpu *name#define DEFINE_SNMP_STAT_ATOMIC(type, name)	\	__typeof__(type) *name#define DECLARE_SNMP_STAT(type, name)	\	extern __typeof__(type) __percpu *name #define __SNMP_INC_STATS(mib, field)	\			__this_cpu_inc(mib->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->mibs[field]) #define SNMP_DEC_STATS(mib, field)	\			this_cpu_dec(mib->mibs[field]) #define __SNMP_ADD_STATS(mib, field, addend)	\			__this_cpu_add(mib->mibs[field], addend) #define SNMP_ADD_STATS(mib, field, addend)	\			this_cpu_add(mib->mibs[field], addend)#define SNMP_UPD_PO_STATS(mib, basefield, addend)	\	do { \		__typeof__((mib->mibs) + 0) ptr = mib->mibs;	\		this_cpu_inc(ptr[basefield##PKTS]);		\		this_cpu_add(ptr[basefield##OCTETS], addend);	\	} while (0)#define __SNMP_UPD_PO_STATS(mib, basefield, addend)	\	do { \		__typeof__((mib->mibs) + 0) ptr = mib->mibs;	\		__this_cpu_inc(ptr[basefield##PKTS]);		\		__this_cpu_add(ptr[basefield##OCTETS], addend);	\	} while (0)  #if BITS_PER_LONG==32 #define __SNMP_ADD_STATS64(mib, field, addend) 				\	do {								\		__typeof__(*mib) *ptr = raw_cpu_ptr(mib);		\		u64_stats_update_begin(&ptr->syncp);			\		ptr->mibs[field] += addend;				\		u64_stats_update_end(&ptr->syncp);			\	} while (0) #define SNMP_ADD_STATS64(mib, field, addend) 				\	do {								\		local_bh_disable();					\		__SNMP_ADD_STATS64(mib, field, addend);			\		local_bh_enable();				\	} while (0) #define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)#define __SNMP_UPD_PO_STATS64(mib, basefield, addend)			\	do {								\		__typeof__(*mib) *ptr;				\		ptr = raw_cpu_ptr((mib));				\		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(mib, basefield, addend);		\		local_bh_enable();				\	} while (0)#else#define __SNMP_INC_STATS64(mib, field)		__SNMP_INC_STATS(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(mib, field, addend)	__SNMP_ADD_STATS(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(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend)#endif #endif