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Date: Tue, 3 Sep 2013 10:42:32 +0300
From: Menny Hamburger <Menny_Hamburger@...l.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] Per IP network statistics: SNMP MIB subsets
diff -r -U 4 a/include/linux/snmp.h b/include/linux/snmp.h
--- a/include/linux/snmp.h 2013-09-01 09:03:35.355639246 +0300
+++ b/include/linux/snmp.h 2013-09-01 09:03:35.410960814 +0300
@@ -261,5 +261,18 @@
LINUX_MIB_XFRMOUTPOLERROR, /* XfrmOutPolError */
__LINUX_MIB_XFRMMAX
};
+enum {
+ SNMP_IPSTATS_MIB = 0,
+ SNMP_ICMP_MIB,
+ SNMP_ICMPMSG_MIB,
+ SNMP_ICMP6_MIB,
+ SNMP_ICMP6MSG_MIB,
+ SNMP_TCP_MIB,
+ SNMP_UDP_MIB,
+ SNMP_LINUX_MIB,
+ SNMP_LINUX_XFRM_MIB,
+ __SNMP_MIB_MAX,
+};
+
#endif /* _LINUX_SNMP_H */
diff -r -U 4 a/include/linux/sysctl.h b/include/linux/sysctl.h
--- a/include/linux/sysctl.h 2013-09-01 09:03:35.361639131 +0300
+++ b/include/linux/sysctl.h 2013-09-01 09:03:35.428631683 +0300
@@ -433,8 +433,11 @@
NET_TCP_AVAIL_CONG_CONTROL=122,
NET_TCP_ALLOWED_CONG_CONTROL=123,
NET_TCP_MAX_SSTHRESH=124,
NET_TCP_FRTO_RESPONSE=125,
+#ifdef CONFIG_NET_IPV4_SNMP_MAPPING
+ NET_IPV4_SNMP_MAP_LEVEL=126,
+#endif
};
enum {
NET_IPV4_ROUTE_FLUSH=1,
diff -r -U 4 a/include/net/snmp_map.h b/include/net/snmp_map.h
--- a/include/net/snmp_map.h 2013-09-01 09:03:35.367639297 +0300
+++ b/include/net/snmp_map.h 2013-09-01 09:03:35.442635908 +0300
@@ -0,0 +1,374 @@
+/*
+ *
+ * SNMP MIB mapping for maintaining a subset of the statistical counters.
+ *
+ * Menny Hamburger<menny_hamburger@...l.com>
+ *
+ * The purpose of SNMP MIB mapping is to reduce the memory overhead of maintaining the full set
+ * of counters, which is essential if we need to allocate counters dynamically.
+ * A Mapping includes a u8 array that includes indecies into the per CPU counter array.
+ *
+ */
+
+
+#ifndef _SNMP_MAP_H
+#define _SNMP_MAP_H
+
+#ifdef CONFIG_NET_IPV4_SNMP_MAPPING
+
+#include <net/snmp.h>
+
+/*
+ * By keeping several levels of mappings, we define what counters will be maintained in each level.
+ * This helps reduce the CPU overhead of usage and memory allocation to a minimum in the default level.
+ */
+enum {
+ SNMP_MAP_LEVEL_DEFAULT,
+ SNMP_MAP_LEVEL_DIAG,
+ SNMP_MAP_LEVEL_MAX,
+};
+
+struct snmp_mib_mapped_data {
+ unsigned long mibs[0];
+};
+
+struct snmp_mib_mapped_data_aligned {
+ unsigned long mibs[0];
+} __SNMP_MIB_ALIGN__;
+
+#ifndef SNMP_ARRAY_SZ
+#define SNMP_ARRAY_SZ 2
+#elif (SNMP_ARRAY_SZ == 1)
+#error "counters without Top/Bottom half separations are not yet supported"
+#endif
+
+#define DEFINE_SNMP_STAT_MAPPED(type, name) \
+ __typeof__(type) *name[SNMP_ARRAY_SZ]
+#define DECLARE_SNMP_STAT_MAPPED(type, name) \
+ extern __typeof__(type) *name[SNMP_ARRAY_SZ]
+
+#define DEFINE_SNMP_STAT_MAPPING(type, name) \
+ u8 maplvl; \
+ u8 mibid; \
+ __typeof__(type) name
+
+struct ipstats_mib_mapping {
+ u8 mapping[__IPSTATS_MIB_MAX];
+};
+
+struct ipstats_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct ipstats_mib_mapping, map);
+};
+
+
+
+struct icmp_mib_mapping {
+ u8 mapping[__ICMP_MIB_MAX];
+};
+
+struct icmp_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct icmp_mib_mapping, map);
+};
+
+
+
+struct icmpmsg_mib_mapping {
+ u8 mapping[__ICMPMSG_MIB_MAX];
+};
+
+struct icmpmsg_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct icmpmsg_mib_mapping, map);
+};
+
+
+struct icmpv6_mib_mapping {
+ u8 mapping[__ICMP6_MIB_MAX];
+};
+
+struct icmpv6_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct icmpv6_mib_mapping, map);
+};
+
+
+struct icmpv6msg_mib_mapping {
+ u8 mapping[__ICMP6MSG_MIB_MAX];
+};
+
+struct icmpv6msg_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct icmpv6msg_mib_mapping, map);
+};
+
+
+struct tcp_mib_mapping {
+ u8 mapping[__TCP_MIB_MAX];
+};
+
+struct tcp_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct tcp_mib_mapping, map);
+};
+
+
+struct udp_mib_mapping {
+ u8 mapping[__UDP_MIB_MAX];
+};
+
+struct udp_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct udp_mib_mapping, map);
+};
+
+
+struct linux_mib_mapping {
+ u8 mapping[__LINUX_MIB_MAX];
+};
+
+struct linux_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct linux_mib_mapping, map);
+};
+
+
+struct linux_xfrm_mib_mapping {
+ u8 mapping[__LINUX_MIB_XFRMMAX];
+};
+
+struct linux_xfrm_mib_map {
+ DEFINE_SNMP_STAT_MAPPED(struct snmp_mib_mapped_data_aligned, stats);
+ DEFINE_SNMP_STAT_MAPPING(struct linux_xfrm_mib_mapping, map);
+};
+
+
+#define DEFINE_SNMP_MIB_MAP(type, name) \
+ __typeof__(type) name;
+
+
+union mib_mapping {
+ u8 mapping[0];
+ u8 ipstats_mapping[__IPSTATS_MIB_MAX];
+ u8 icmp_mapping[__ICMP_MIB_MAX];
+ u8 icmpmsg_mapping[__ICMPMSG_MIB_MAX];
+ u8 icmp6_mapping[__ICMP6_MIB_MAX];
+ u8 icmp6msg_mapping[__ICMP6MSG_MIB_MAX];
+ u8 tcp_mapping[__TCP_MIB_MAX];
+ u8 udp_mapping[__UDP_MIB_MAX];
+ u8 linux_mapping[__LINUX_MIB_MAX];
+ u8 linux_xfrm_mapping[__LINUX_MIB_XFRMMAX];
+};
+
+struct mib_mapped {
+ struct snmp_mib_mapped_data *stats[SNMP_ARRAY_SZ];
+};
+
+struct snmp_mib_map {
+ struct mib_mapped stats;
+ u8 maplvl;
+ u8 mibid;
+ union mib_mapping map;
+};
+
+/* Counter bitmap used to apply behavior on specific counters within an SNMP MIB */
+struct snmp_mib_map_bitmap_container {
+ unsigned long bitmap[0];
+};
+
+#define DEFINE_SNMP_MAP_BITMAP_CONTAINER(type) \
+ type##_map_bitmap_container { \
+ DECLARE_BITMAP(bitmap, sizeof(type##_mapping)); \
+ }
+
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct ipstats_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct icmp_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct icmpmsg_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct icmpv6_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct icmpv6msg_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct tcp_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct udp_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct linux_mib);
+DEFINE_SNMP_MAP_BITMAP_CONTAINER(struct linux_xfrm_mib);
+
+union snmp_mib_map_bitmaps {
+ struct snmp_mib_map_bitmap_container bmap;
+ struct ipstats_mib_map_bitmap_container ipstats_bmap;
+ struct icmp_mib_map_bitmap_container icmp_bmap;
+ struct icmpmsg_mib_map_bitmap_container icmpmsg_bmap;
+ struct icmpv6_mib_map_bitmap_container icmpv6_bmap;
+ struct icmpv6msg_mib_map_bitmap_container icmpv6msg_bmap;
+ struct tcp_mib_map_bitmap_container tcp_bmap;
+ struct udp_mib_map_bitmap_container udp_bmap;
+ struct linux_mib_map_bitmap_container linux_bmap;
+ struct linux_xfrm_mib_map_bitmap_container linux_xfrm_bmap;
+};
+
+
+
+
+/* Basic counter update macros just the original counters */
+#define SNMP_INC_STATS_MAP_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
+#define SNMP_INC_STATS_MAP_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
+#define SNMP_INC_STATS_MAP(mib, field) SNMP_INC_STATS(mib, field)
+#define SNMP_DEC_STATS_MAP(mib, field) SNMP_DEC_STATS(mib, field)
+#define SNMP_ADD_STATS_MAP(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
+#define SNMP_ADD_STATS_MAP_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
+#define SNMP_ADD_STATS_MAP_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
+
+#define SNMP_MAP_UNMAPPED 255
+
+static inline u8
+snmp_map_get_mapping(struct snmp_mib_map *m, u8 field)
+{
+ if (m != NULL) {
+ u8 mappedto = m->map.mapping[field];
+ if (mappedto != SNMP_MAP_UNMAPPED)
+ return mappedto;
+ }
+
+ return SNMP_MAP_UNMAPPED;
+}
+
+/* Macros that look up field in mapping and accesses it's location in the counter array */
+#define SNMP_INC_STATS_MAPPING_BH(m, field) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_INC_STATS_MAP_BH((m)->stats.stats, mappedto); \
+ } while (0)
+#define SNMP_INC_STATS_MAPPING_USER(m, field) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_INC_STATS_MAP_USER((m)->stats.stats, mappedto); \
+ } while (0)
+#define SNMP_INC_STATS_MAPPING(m, field) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_INC_STATS_MAP((m)->stats.stats, mappedto); \
+ } while (0)
+#define SNMP_DEC_STATS_MAPPING(m, field) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_DEC_STATS_MAP((m)->stats.stats, mappedto); \
+ } while (0)
+#define SNMP_ADD_STATS_MAPPING(m, field, addend) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_ADD_STATS_MAP((m)->stats.stats, mappedto, addend); \
+ } while (0)
+#define SNMP_ADD_STATS_MAPPING_BH(m, field, addend) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_ADD_STATS_MAP_BH((m)->stats.stats, mappedto, addend); \
+ } while (0)
+#define SNMP_ADD_STATS_MAPPING_USER(m, field, addend) \
+ do { \
+ u8 mappedto = snmp_map_get_mapping((struct snmp_mib_map *) (m), field); \
+ if (mappedto != SNMP_MAP_UNMAPPED) \
+ SNMP_ADD_STATS_MAP_USER((m)->stats.stats, mappedto, addend); \
+ } while (0)
+
+
+/* Register the labels used for displaying the counters */
+extern int snmp_map_register_labels(u8 mibid, const struct snmp_mib *labels, int n);
+
+/*
+ * Define a global mapping for counters specified in 'mapping' per SNMP MIB and map level
+ * When mapping is NULL, the function maps all the counters not added in previous map levels, unless
+ * they are excluded via exmapping.
+ */
+extern int snmp_map_add_mapping(u8 maplvl, u8 mibid, u8 *mapping, int count, u8 *exmapping, int excount);
+/*
+ * Add an empty mapping - all counters are left SNMP_MAP_UNMAPPED.
+ * This is used so upper layers can test that mapping is initialized even if it has no mappings.
+ */
+extern int snmp_map_add_empty_mapping(u8 maplvl, u8 mibid);
+/* Undefine a mapping for a specified SNMP MIB and map level */
+extern int snmp_map_del_mapping(u8 maplvl, u8 mibid);
+
+/*
+ * Get the number of counters currently registered for the specific SNMP MIB and map level.
+ * We use this when dumping the counters so we don't display any output if no counters were registered.
+ */
+extern int snmp_map_count(struct snmp_mib_map *m);
+
+/*
+ * Initialize a mapping - no allocation yet.
+ * This must be called before allocating the counters to set the map level and SNMP MIB ID in a newly
+ * allocated mapping.
+ */
+int snmp_map_init_map(u8 maplvl, u8 mibid, struct snmp_mib_map *m);
+
+/* Allocate per CPU counters */
+int snmp_map_mib_init(struct snmp_mib_map *m);
+
+/*
+ * In cases where a counter is both incremented and decremented, a specific counter may overflow when decremening zero.
+ * This can happen in two situation:
+ * 1) Missed increment
+ * 2) Counters are artificially decremented to zero.
+ * Since a counter value can be higher the LONG_MAX, we can't destinguish between an overflow and a real value in the
+ * range of LONG_MAX - ULONG_MAX. If we know that a specific counter is both incremented and decremented,
+ * it is logical to assume that we will never reach LONG_MAX, so in this case we can test the value of the counter and zero
+ * it if it is negative.
+ *
+ * This function Displays the counters countained in a mapping.
+ * bitmap argument specifies which counters to test for negative and zero.
+ */
+extern int snmp_map_print_stats(struct seq_file *seq, struct snmp_mib_map *m, union snmp_mib_map_bitmaps *bitmap);
+/* Zero a negative counter */
+extern void snmp_map_zero_negative(struct snmp_mib_map *m, u8 field);
+
+/* Zero per CPU counters */
+void snmp_map_mib_zero(struct snmp_mib_map *m);
+/* Free per CPU memory allocated for counters */
+void snmp_map_mib_free(struct snmp_mib_map *m);
+
+/* Global map level used for determining the set of counters to be allocated and updated */
+extern int snmp_map_level;
+extern int snmp_map_level_handler(ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos);
+
+/*
+ * Maintain a global array that maps a field in specific MIB to a map level.
+ * The array is used to determine whether a specific counter needs to be updated in the current map level (snmp_map_level).
+ */
+struct snmp_map_mapper {
+ u32 len;
+ union mib_mapping map_map;
+};
+
+extern struct snmp_map_mapper *map_mappings[__SNMP_MIB_MAX];
+
+static inline struct snmp_map_mapper *
+snmp_map_get_mapper(u8 mibid)
+{
+ return ((mibid >= __SNMP_MIB_MAX) ? NULL : map_mappings[mibid]);
+}
+
+static inline u8
+snmp_map_get_map_level(u8 mibid, u8 field)
+{
+ struct snmp_map_mapper *mapper = snmp_map_get_mapper(mibid);
+
+ return ((mapper != NULL) ? mapper->map_map.mapping[field] : SNMP_MAP_UNMAPPED);
+}
+
+/* Upper layers should test this before calling the actual macro that updates the counter. */
+static inline bool
+snmp_map_allow_update(u8 mibid, u8 field)
+{
+ u8 maplvl = snmp_map_get_map_level(mibid, field);
+
+ return ((maplvl == SNMP_MAP_UNMAPPED) ? false : maplvl <= snmp_map_level);
+}
+
+#endif
+
+#endif
diff -r -U 4 a/net/ipv4/Kconfig b/net/ipv4/Kconfig
--- a/net/ipv4/Kconfig 2013-09-01 09:03:35.373637542 +0300
+++ b/net/ipv4/Kconfig 2013-09-01 09:03:35.461631233 +0300
@@ -640,4 +640,14 @@
on the Internet.
If unsure, say N.
+config NET_IPV4_SNMP_MAPPING
+ boolean "Allow defining a subset of counters in a stat mib to reduce size"
+ depends on INET
+ default n
+ ---help---
+ The statistics footprint in memory can be quite large due to the fact that
+ the counters are allocated per CPU and each counter is 8 bytes.
+ This feature enables allocation of only a subset of counters from within a stat mib
+ by defining a mapping between the whole range of counters to a smaller set.
+
diff -r -U 4 a/net/ipv4/Makefile b/net/ipv4/Makefile
--- a/net/ipv4/Makefile 2013-09-01 09:03:35.379639110 +0300
+++ b/net/ipv4/Makefile 2013-09-01 09:03:35.479601685 +0300
@@ -51,4 +51,6 @@
obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
xfrm4_output.o
+obj-$(CONFIG_NET_IPV4_SNMP_MAPPING) += snmp_map.o
+
diff -r -U 4 a/net/ipv4/snmp_map.c b/net/ipv4/snmp_map.c
--- a/net/ipv4/snmp_map.c 2013-09-01 09:03:35.385639309 +0300
+++ b/net/ipv4/snmp_map.c 2013-09-01 09:03:35.494590279 +0300
@@ -0,0 +1,690 @@
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sort.h>
+
+#include <net/ip.h>
+#include <net/snmp_map.h>
+
+/* Structures for maintaining mapping information on every (SNMP MIB, map level) */
+struct snmp_mib_map_info {
+ spinlock_t lock;
+ atomic_t initialized;
+ u32 len;
+ atomic_t count;
+ u8 mibid;
+ union mib_mapping map;
+};
+
+#define DEFINE_SNMP_MAP_INFO(type) \
+ type##_map_info { \
+ spinlock_t lock; \
+ atomic_t initialized; \
+ u32 len; \
+ atomic_t count; \
+ u8 mibid; \
+ type##_mapping map; \
+ }
+
+DEFINE_SNMP_MAP_INFO(struct ipstats_mib);
+DEFINE_SNMP_MAP_INFO(struct icmp_mib);
+DEFINE_SNMP_MAP_INFO(struct icmpmsg_mib);
+DEFINE_SNMP_MAP_INFO(struct icmpv6_mib);
+DEFINE_SNMP_MAP_INFO(struct icmpv6msg_mib);
+DEFINE_SNMP_MAP_INFO(struct tcp_mib);
+DEFINE_SNMP_MAP_INFO(struct udp_mib);
+DEFINE_SNMP_MAP_INFO(struct linux_mib);
+DEFINE_SNMP_MAP_INFO(struct linux_xfrm_mib);
+
+#define DECLARE_SNMP_MAP_INFO(type, mtype, name) \
+ __typeof__(type##_map_info) name = { \
+ .lock = SPIN_LOCK_UNLOCKED, \
+ .initialized = ATOMIC_INIT(0), \
+ .len = sizeof(type##_mapping), \
+ .count = ATOMIC_INIT(0), \
+ .mibid = (mtype), \
+ }
+
+static DECLARE_SNMP_MAP_INFO(struct ipstats_mib, SNMP_IPSTATS_MIB, ipstats_map_info);
+static DECLARE_SNMP_MAP_INFO(struct icmp_mib, SNMP_ICMP_MIB, icmp_map_info);
+static DECLARE_SNMP_MAP_INFO(struct icmpmsg_mib, SNMP_ICMPMSG_MIB, icmpmsg_map_info);
+static DECLARE_SNMP_MAP_INFO(struct icmpv6_mib, SNMP_ICMP6_MIB, icmpv6_map_info);
+static DECLARE_SNMP_MAP_INFO(struct icmpv6msg_mib, SNMP_ICMP6MSG_MIB, icmpv6msg_map_info);
+static DECLARE_SNMP_MAP_INFO(struct tcp_mib, SNMP_TCP_MIB, tcp_map_info);
+static DECLARE_SNMP_MAP_INFO(struct udp_mib, SNMP_UDP_MIB, udp_map_info);
+static DECLARE_SNMP_MAP_INFO(struct linux_mib, SNMP_LINUX_MIB, linux_map_info);
+static DECLARE_SNMP_MAP_INFO(struct linux_xfrm_mib, SNMP_LINUX_XFRM_MIB, linux_xfrm_map_info);
+
+static struct snmp_mib_map_info *map_info_default[__SNMP_MIB_MAX] = {
+ (struct snmp_mib_map_info *) &ipstats_map_info,
+ (struct snmp_mib_map_info *) &icmp_map_info,
+ (struct snmp_mib_map_info *) &icmpmsg_map_info,
+ (struct snmp_mib_map_info *) &icmpv6_map_info,
+ (struct snmp_mib_map_info *) &icmpv6msg_map_info,
+ (struct snmp_mib_map_info *) &tcp_map_info,
+ (struct snmp_mib_map_info *) &udp_map_info,
+ (struct snmp_mib_map_info *) &linux_map_info,
+ (struct snmp_mib_map_info *) &linux_xfrm_map_info,
+};
+
+static DECLARE_SNMP_MAP_INFO(struct ipstats_mib, SNMP_IPSTATS_MIB, ipstats_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct icmp_mib, SNMP_ICMP_MIB, icmp_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct icmpmsg_mib, SNMP_ICMPMSG_MIB, icmpmsg_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct icmpv6_mib, SNMP_ICMP6_MIB, icmpv6_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct icmpv6msg_mib, SNMP_ICMP6MSG_MIB, icmpv6msg_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct tcp_mib, SNMP_TCP_MIB, tcp_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct udp_mib, SNMP_UDP_MIB, udp_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct linux_mib, SNMP_LINUX_MIB, linux_map_info_diag);
+static DECLARE_SNMP_MAP_INFO(struct linux_xfrm_mib, SNMP_LINUX_XFRM_MIB, linux_xfrm_map_info_diag);
+
+static struct snmp_mib_map_info *map_info_diag[__SNMP_MIB_MAX] = {
+ (struct snmp_mib_map_info *) &ipstats_map_info_diag,
+ (struct snmp_mib_map_info *) &icmp_map_info_diag,
+ (struct snmp_mib_map_info *) &icmpmsg_map_info_diag,
+ (struct snmp_mib_map_info *) &icmpv6_map_info_diag,
+ (struct snmp_mib_map_info *) &icmpv6msg_map_info_diag,
+ (struct snmp_mib_map_info *) &tcp_map_info_diag,
+ (struct snmp_mib_map_info *) &udp_map_info_diag,
+ (struct snmp_mib_map_info *) &linux_map_info_diag,
+ (struct snmp_mib_map_info *) &linux_xfrm_map_info_diag,
+};
+
+static struct snmp_mib_map_info **map_info[] = {
+ map_info_default,
+ map_info_diag,
+};
+
+
+
+/* Structures for maintaining labels of each counter in every SNMP MIB */
+struct snmp_mib_map_labels {
+ u32 len;
+ u32 registered;
+ char *names[0];
+};
+
+#define DEFINE_SNMP_MAP_LABELS(type) \
+ type##_labels { \
+ u32 len; \
+ u32 registered; \
+ char *names[sizeof(type##_mapping)]; \
+ }
+
+DEFINE_SNMP_MAP_LABELS(struct ipstats_mib);
+DEFINE_SNMP_MAP_LABELS(struct icmp_mib);
+DEFINE_SNMP_MAP_LABELS(struct icmpmsg_mib);
+DEFINE_SNMP_MAP_LABELS(struct icmpv6_mib);
+DEFINE_SNMP_MAP_LABELS(struct icmpv6msg_mib);
+DEFINE_SNMP_MAP_LABELS(struct tcp_mib);
+DEFINE_SNMP_MAP_LABELS(struct udp_mib);
+DEFINE_SNMP_MAP_LABELS(struct linux_mib);
+DEFINE_SNMP_MAP_LABELS(struct linux_xfrm_mib);
+
+#define DECLARE_SNMP_MAP_LABELS(type, name) \
+ __typeof__(type##_labels) name= { \
+ .len = sizeof(type##_mapping), \
+ .registered = 0, \
+ }
+
+static DECLARE_SNMP_MAP_LABELS(struct ipstats_mib, ipstats_labels);
+static DECLARE_SNMP_MAP_LABELS(struct icmp_mib, icmp_labels);
+static DECLARE_SNMP_MAP_LABELS(struct icmpmsg_mib, icmpmsg_labels);
+static DECLARE_SNMP_MAP_LABELS(struct icmpv6_mib, icmpv6_labels);
+static DECLARE_SNMP_MAP_LABELS(struct icmpv6msg_mib, icmpv6msg_labels);
+static DECLARE_SNMP_MAP_LABELS(struct tcp_mib, tcp_labels);
+static DECLARE_SNMP_MAP_LABELS(struct udp_mib, udp_labels);
+static DECLARE_SNMP_MAP_LABELS(struct linux_mib, linux_labels);
+static DECLARE_SNMP_MAP_LABELS(struct linux_xfrm_mib, linux_xfrm_labels);
+
+static DEFINE_SPINLOCK(snmp_map_label_lock);
+static struct snmp_mib_map_labels *map_labels[__SNMP_MIB_MAX] = {
+ (struct snmp_mib_map_labels *) &ipstats_labels,
+ (struct snmp_mib_map_labels *) &icmp_labels,
+ (struct snmp_mib_map_labels *) &icmpmsg_labels,
+ (struct snmp_mib_map_labels *) &icmpv6_labels,
+ (struct snmp_mib_map_labels *) &icmpv6msg_labels,
+ (struct snmp_mib_map_labels *) &tcp_labels,
+ (struct snmp_mib_map_labels *) &udp_labels,
+ (struct snmp_mib_map_labels *) &linux_labels,
+ (struct snmp_mib_map_labels *) &linux_xfrm_labels,
+};
+
+
+/* Structures for maitainig a mapping from each counter in an SNMP MIB to the assigned map level*/
+#define DEFINE_MAP_MAPPING(type) \
+ type##_map_mapping_info { \
+ u32 len; \
+ type##_mapping map_map; \
+ }
+
+DEFINE_MAP_MAPPING(struct ipstats_mib);
+DEFINE_MAP_MAPPING(struct icmp_mib);
+DEFINE_MAP_MAPPING(struct icmpmsg_mib);
+DEFINE_MAP_MAPPING(struct icmpv6_mib);
+DEFINE_MAP_MAPPING(struct icmpv6msg_mib);
+DEFINE_MAP_MAPPING(struct tcp_mib);
+DEFINE_MAP_MAPPING(struct udp_mib);
+DEFINE_MAP_MAPPING(struct linux_mib);
+DEFINE_MAP_MAPPING(struct linux_xfrm_mib);
+
+#define DECLARE_MAP_MAPPING(type, name) \
+ __typeof__(type##_map_mapping_info) name = { \
+ .len = sizeof(type##_mapping), \
+ }
+
+static DECLARE_MAP_MAPPING(struct ipstats_mib, ipstats_map_mapping);
+static DECLARE_MAP_MAPPING(struct icmp_mib, icmp_map_mapping);
+static DECLARE_MAP_MAPPING(struct icmpmsg_mib, icmpmsg_map_mapping);
+static DECLARE_MAP_MAPPING(struct icmpv6_mib, icmpv6_map_mapping);
+static DECLARE_MAP_MAPPING(struct icmpv6msg_mib, icmpv6msg_map_mapping);
+static DECLARE_MAP_MAPPING(struct tcp_mib, tcp_map_mapping);
+static DECLARE_MAP_MAPPING(struct udp_mib, udp_map_mapping);
+static DECLARE_MAP_MAPPING(struct linux_mib, lnx_map_mapping);
+static DECLARE_MAP_MAPPING(struct linux_xfrm_mib, lnx_xfrm_map_mapping);
+
+struct snmp_map_mapper *map_mappings[__SNMP_MIB_MAX] = {
+ (struct snmp_map_mapper *) &ipstats_map_mapping,
+ (struct snmp_map_mapper *) &icmp_map_mapping,
+ (struct snmp_map_mapper *) &icmpmsg_map_mapping,
+ (struct snmp_map_mapper *) &icmpv6_map_mapping,
+ (struct snmp_map_mapper *) &icmpv6msg_map_mapping,
+ (struct snmp_map_mapper *) &tcp_map_mapping,
+ (struct snmp_map_mapper *) &udp_map_mapping,
+ (struct snmp_map_mapper *) &lnx_map_mapping,
+ (struct snmp_map_mapper *) &lnx_xfrm_map_mapping,
+};
+EXPORT_SYMBOL(map_mappings);
+
+int snmp_map_level = SNMP_MAP_LEVEL_DEFAULT;
+EXPORT_SYMBOL(snmp_map_level);
+
+#define SNMP_MAP_PREFIX "snmp_map: "
+
+#ifdef SNMP_MAP_DEBUG
+#define snmp_map_dprintk(level, format...) \
+ printk(KERN_DEBUG SNMP_MAP_PREFIX format)
+#else
+#define snmp_map_dprintk(level, format...)
+#endif
+
+static inline struct snmp_mib_map_info *
+snmp_map_get_info(u8 maplvl, u8 mibid)
+{
+ struct snmp_mib_map_info *info = NULL;
+
+ if (maplvl >= SNMP_MAP_LEVEL_MAX) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "invalid map level %d\n", maplvl);
+ return NULL;
+ }
+
+ if (mibid >= __SNMP_MIB_MAX) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "invalid SNMP MIB ID %d\n", mibid);
+ return NULL;
+ }
+
+ info = map_info[maplvl][mibid];
+
+ return info;
+}
+
+static inline struct snmp_mib_map_info *
+snmp_map_get_initialized_info(u8 maplvl, u8 mibid)
+{
+ struct snmp_mib_map_info *info = snmp_map_get_info(maplvl, mibid);
+
+ return (((info != NULL) && (atomic_read(&info->initialized) == 1)) ? info : NULL);
+}
+
+static inline bool
+snmp_map_initialized(struct snmp_mib_map_info *info)
+{
+ return (atomic_read(&info->initialized) == 1);
+}
+
+int
+snmp_map_count(struct snmp_mib_map *m)
+{
+ struct snmp_mib_map_info *info = snmp_map_get_initialized_info(m->maplvl, m->mibid);
+
+ return ((info != NULL) ? atomic_read(&info->count): 0);
+}
+EXPORT_SYMBOL(snmp_map_count);
+
+static int
+snmp_map_get_count(u8 maplvl, u8 mibid)
+{
+ struct snmp_mib_map_info *info = NULL;
+
+ if ((info = snmp_map_get_info(maplvl, mibid)) == NULL)
+ return -EINVAL;
+
+ return (atomic_read(&info->count));
+}
+
+static int
+snmp_map_size(u8 maplvl, u8 mibid)
+{
+ return (snmp_map_get_count(maplvl, mibid) * sizeof(unsigned long));
+}
+
+static inline void
+snmp_map_zero_mapping(u8 *mapping, int len)
+{
+ memset(mapping, SNMP_MAP_UNMAPPED, len);
+}
+
+static inline void
+snmp_map_copy_mapping(u8 *mapping, struct snmp_mib_map_info *info)
+{
+ memcpy(mapping, info->map.mapping, info->len * sizeof(info->map.mapping[0]));
+}
+
+int
+snmp_map_register_labels(u8 mibid, const struct snmp_mib *l, int len)
+{
+ int err = 0, i;
+ static struct snmp_mib_map_labels *labels;
+
+ if (mibid >= __SNMP_MIB_MAX) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "invalid SNMP MIB ID %d\n", mibid);
+ return -ENOENT;
+ }
+
+ labels = map_labels[mibid];
+ spin_lock(&snmp_map_label_lock);
+
+ if (labels->registered == 0)
+ memset(labels->names, 0, labels->len * sizeof(labels->names[0]));
+
+ for (i = 0; i < len; i++) {
+ if (l[i].name == NULL)
+ break;
+
+ if (l[i].entry < 1 || l[i].entry >= labels->len) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "label counter %d not in range (%d-%d) for SNMP MIB %d\n",
+ l[i].entry, 1, labels->len - 1, mibid);
+ continue;
+ }
+
+ if (labels->names[l[i].entry] != NULL) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "overwritting counter label %s for SNMP MIB %d\n", l[i].name, mibid);
+ kfree(labels->names[l[i].entry]);
+ }
+
+ labels->names[l[i].entry] = kstrdup(l[i].name, GFP_KERNEL);
+ if (labels->names[l[i].entry] == NULL) {
+ err = -ENOMEM;
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "OOM while trying to allocate labels for SNMP MIB %d\n", mibid);
+ break;
+ }
+
+ labels->registered++;
+ }
+ spin_unlock(&snmp_map_label_lock);
+
+ printk(KERN_INFO SNMP_MAP_PREFIX "registered %d labels for SNMP MIB %d\n", labels->registered, mibid);
+
+ return err;
+}
+
+static int cmp_mappings(const void *va, const void *vb)
+{
+ const u8 *a = (const u8 *) va, *b = (const u8 *) vb;
+
+ return (*a == *b)? 0 : (*a > *b)? 1 : -1;
+}
+
+static void
+snmp_map_print_mapping(u8 maplvl, u8 mibid, u8 *m, int count, int len)
+{
+#ifdef SNMP_MAP_DEBUG
+ int i;
+ struct snmp_map_mapper *mapper;
+#endif
+
+ printk(KERN_INFO SNMP_MAP_PREFIX "registered map level %d, SNMP MIB %d with %d mappings\n", maplvl, mibid, count);
+
+#ifdef SNMP_MAP_DEBUG
+ printk(KERN_INFO SNMP_MAP_PREFIX "current mappings for SNMP MIB %d:\n", mibid);
+ for (i = 1; i < len; i++) {
+ if (map_labels[mibid]->names[i] != NULL)
+ printk("%s: %d, ", map_labels[mibid]->names[i], m[i]);
+ else
+ printk("%d: %d, ", i, m[i]);
+ }
+ printk("\n\n");
+
+ printk(KERN_INFO SNMP_MAP_PREFIX "current map level registration for SNMP MIB %d:\n", mibid);
+ mapper = snmp_map_get_mapper(mibid);
+ if (mapper) {
+ for (i = 1; i < len; i++) {
+ if (map_labels[mibid]->names[i] != NULL)
+ printk("%s: %d, ", map_labels[mibid]->names[i], mapper->map_map.mapping[i]);
+ else
+ printk("%d: %d, ", i, mapper->map_map.mapping[i]);
+ }
+ printk("\n\n");
+ }
+#endif
+}
+
+int
+snmp_map_add_empty_mapping(u8 maplvl, u8 mibid)
+{
+ struct snmp_mib_map_info *info;
+
+ info = snmp_map_get_info(maplvl, mibid);
+ if (info == NULL)
+ return -EINVAL;
+
+ if (snmp_map_initialized(info)) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "map level %d, SNMP MIB %d is already initialized\n", maplvl, mibid);
+ return -EINVAL;
+ }
+
+ spin_lock(&info->lock);
+
+ snmp_map_zero_mapping(info->map.mapping, info->len * sizeof(info->map.mapping[0]));
+
+ atomic_set(&info->initialized, 1);
+
+ spin_unlock(&info->lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(snmp_map_add_empty_mapping);
+
+int
+snmp_map_add_mapping(u8 maplvl, u8 mibid, u8 *m, int c, u8 *me, int ce)
+{
+ int i, j, field, fields = c, count = c, mappedto = 0;
+ bool exclude = false;
+ struct snmp_mib_map_info *info;
+ struct snmp_map_mapper *mapper;
+
+ info = snmp_map_get_info(maplvl, mibid);
+ if (info == NULL)
+ return -EINVAL;
+
+ if (snmp_map_initialized(info)) {
+ printk(KERN_NOTICE "snmp_map: map level %d, SNMP MIB %d is already initialized\n", maplvl, mibid);
+ return -EINVAL;
+ }
+
+ mapper = snmp_map_get_mapper(mibid);
+ if (unlikely(mapper == NULL))
+ return -EFAULT;
+
+ spin_lock(&info->lock);
+
+ snmp_map_zero_mapping(info->map.mapping, info->len * sizeof(info->map.mapping[0]));
+
+ if (m != NULL)
+ sort(m, count, sizeof(m[0]), cmp_mappings, NULL);
+ else
+ count = fields = info->len;
+
+ if (me != NULL)
+ sort(me, ce, sizeof(me[0]), cmp_mappings, NULL);
+
+ for (i = ((m != NULL) ? 0 : 1); i < count; i++) {
+ exclude = false;
+ field = ((m != NULL) ? m[i] : i);
+ if (field <= 0 || field >= info->len) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "counter %d not in range (%d-%d) for SNMP MIB %d\n",
+ field, 1, info->len - 1, mibid);
+ fields -= 1;
+ continue;
+ }
+
+ if (me != NULL) {
+ for (j = 0; j < ce; j++) {
+ if (me[j] == field) {
+ exclude = true;
+ break;
+ }
+ }
+ if (exclude) {
+ fields -= 1;
+ continue;
+ }
+ }
+
+ /* A mapping can exist on only one level so we can have a one to one mapping from a field to a level */
+ if (mapper->map_map.mapping[field] == SNMP_MAP_UNMAPPED) {
+ info->map.mapping[field] = mappedto++;
+ mapper->map_map.mapping[field] = maplvl;
+ } else {
+ fields -= 1;
+ if (m != NULL)
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "counter %d already mapped for SNMP MIB %d\n", field, mibid);
+ }
+ }
+
+ if (fields > 0) {
+ atomic_set(&info->count, fields);
+ atomic_set(&info->initialized, 1);
+ }
+
+ spin_unlock(&info->lock);
+
+ if (fields > 0) {
+ snmp_map_print_mapping(maplvl, mibid, info->map.mapping, fields, info->len);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(snmp_map_add_mapping);
+
+int
+snmp_map_del_mapping(u8 maplvl, u8 mibid)
+{
+ struct snmp_mib_map_info *info;
+ int i;
+ struct snmp_map_mapper *mapper;
+
+ info = snmp_map_get_info(maplvl, mibid);
+ if (info == NULL)
+ return -EINVAL;
+
+ mapper = snmp_map_get_mapper(mibid);
+ if (unlikely(mapper == NULL))
+ return -EFAULT;
+
+ if (!snmp_map_initialized(info)) {
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "map level %d, SNMP MIB %d is not initialized - nothing to delete\n", maplvl, mibid);
+ return 0;
+ }
+
+ spin_lock(&info->lock);
+ atomic_set(&info->initialized, 0);
+ atomic_set(&info->count, 0);
+ for (i = 0; i < info->len; i++) {
+ if (mapper->map_map.mapping[i] == maplvl) {
+ mapper->map_map.mapping[i] = SNMP_MAP_UNMAPPED;
+ }
+ }
+ snmp_map_zero_mapping(info->map.mapping, info->len * sizeof(info->map.mapping[0]));
+ spin_unlock(&info->lock);
+
+ printk(KERN_INFO SNMP_MAP_PREFIX "cleared map level %d, SNMP MIB %d mappings\n", maplvl, mibid);
+
+ return 0;
+}
+EXPORT_SYMBOL(snmp_map_del_mapping);
+
+int
+snmp_map_init_map(u8 maplvl, u8 mibid, struct snmp_mib_map *m)
+{
+ struct snmp_mib_map_info *info;
+
+ info = snmp_map_get_info(maplvl, mibid);
+ if (info == NULL)
+ return -EINVAL;
+
+ m->maplvl = maplvl;
+ m->mibid = mibid;
+ snmp_map_copy_mapping(m->map.mapping, info);
+ m->stats.stats[0] = NULL;
+ m->stats.stats[1] = NULL;
+
+ return 0;
+}
+
+int
+snmp_map_mib_init(struct snmp_mib_map *m)
+{
+ int err = -EINVAL, sz = snmp_map_size(m->maplvl, m->mibid);
+
+ if (sz == 0)
+ return 0;
+
+ if ((m->stats.stats[0] == NULL) && (m->stats.stats[1] == NULL))
+ err = snmp_mib_init((void **) &m->stats, sz);
+
+ return err;
+}
+
+void
+snmp_map_mib_free(struct snmp_mib_map *m)
+{
+ int sz = snmp_map_size(m->maplvl, m->mibid);
+
+ if (sz == 0)
+ return;
+
+ if ((m->stats.stats[0] != NULL) && (m->stats.stats[1] != NULL))
+ snmp_mib_free((void **) &m->stats);
+}
+
+void
+snmp_map_mib_zero(struct snmp_mib_map *m)
+{
+ struct snmp_mib_map_info *info = NULL;
+ int sz;
+
+ if ((info = snmp_map_get_info(m->maplvl, m->mibid)) == NULL)
+ return;
+
+ if (!snmp_map_initialized(info))
+ return;
+
+ sz = atomic_read(&info->count) * sizeof(unsigned long);
+ if (sz > 0 && (m->stats.stats[0] != NULL ) && (m->stats.stats[1] != NULL)) {
+ unsigned long *p0, *p1;
+ int i;
+
+ for_each_possible_cpu(i) {
+ p0 = (unsigned long *) per_cpu_ptr(m->stats.stats[0], i);
+ p1 = (unsigned long *) per_cpu_ptr(m->stats.stats[1], i);
+ memset(p0, 0, sz);
+ memset(p1, 0, sz);
+ smp_mb();
+ }
+ }
+}
+
+static unsigned long
+snmp_map_fold_field(struct snmp_mib_map *m, int mappedto, bool test_negative)
+{
+ unsigned long ures = 0;
+
+ if (m != NULL && snmp_map_count(m) != 0) {
+ ures = snmp_fold_field((void **) &m->stats, mappedto);
+ if (test_negative) {
+ long res = (long) ures;
+ if (res < 0) {
+ unsigned long *p = (unsigned long *) per_cpu_ptr(m->stats.stats[!in_softirq()], get_cpu());
+ p[mappedto] += (-res);
+ put_cpu();
+ ures = 0;
+ }
+ }
+ }
+
+ return ures;
+}
+
+void
+snmp_map_zero_negative(struct snmp_mib_map *m, u8 field)
+{
+ long res;
+ int mappedto = m->map.mapping[field];
+
+ res = (long) snmp_fold_field((void **) &m->stats, mappedto);
+ if (res < 0) {
+ unsigned long *p = (unsigned long *) per_cpu_ptr(m->stats.stats[!in_softirq()], get_cpu());
+ p[mappedto] += (-res);
+ put_cpu();
+ }
+}
+
+
+int
+snmp_map_print_stats(struct seq_file *seq, struct snmp_mib_map *m, union snmp_mib_map_bitmaps *b)
+{
+ int i;
+ struct snmp_mib_map_info *info;
+ unsigned long counter;
+ bool first = true;
+
+ info = snmp_map_get_info(m->maplvl, m->mibid);
+ if (info == NULL)
+ return -EINVAL;
+
+ if (snmp_map_initialized(info) && atomic_read(&info->count) > 0) {
+ for (i = 1; i < info->len; i++) {
+ int mappedto;
+ bool test_negative = ((b != NULL) && test_bit(i, b->bmap.bitmap));
+
+ mappedto = m->map.mapping[i];
+ if (mappedto != SNMP_MAP_UNMAPPED) {
+ counter = snmp_map_fold_field(m, mappedto, test_negative);
+ if (map_labels[m->mibid]->names[i] != NULL)
+ seq_printf(seq, "%s%s: %lu", (first) ? "" : ", ", map_labels[m->mibid]->names[i], counter);
+ else
+ seq_printf(seq, "%s%d: %lu", (first) ? "" : ", ", i, counter);
+ first = false;
+ }
+ }
+
+ seq_putc(seq, '\n');
+ }
+
+ return 0;
+}
+
+int
+snmp_map_level_handler(ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos)
+{
+ int oldval = snmp_map_level, err = 0;
+
+ proc_dointvec_minmax(table, write, buffer, length, ppos);
+ if (write) {
+ if (snmp_map_level < 0 || snmp_map_level >= SNMP_MAP_LEVEL_MAX) {
+ snmp_map_level = oldval;
+ printk(KERN_NOTICE SNMP_MAP_PREFIX "invalid map level (valid argument: %d - %d)\n", 0, SNMP_MAP_LEVEL_MAX - 1);
+ err = -EINVAL;
+ }
+ smp_mb();
+ }
+
+ return err;
+}
+
+static __init int
+snmp_map_init(void)
+{
+ int i;
+ struct snmp_map_mapper *mapper;
+
+ for (i = 0; i < __SNMP_MIB_MAX; i++) {
+ mapper = map_mappings[i];
+ snmp_map_zero_mapping(mapper->map_map.mapping, mapper->len * sizeof(mapper->map_map.mapping[0]));
+ }
+
+ return 0;
+}
+
+__initcall(snmp_map_init);
+
diff -r -U 4 a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
--- a/net/ipv4/sysctl_net_ipv4.c 2013-09-01 09:03:35.391639189 +0300
+++ b/net/ipv4/sysctl_net_ipv4.c 2013-09-01 09:03:35.511694388 +0300
@@ -814,8 +814,19 @@
.proc_handler = proc_dointvec_minmax,
.strategy = sysctl_intvec,
.extra1 = &zero
},
+#ifdef CONFIG_NET_IPV4_SNMP_MAPPING
+ {
+ .ctl_name = NET_IPV4_SNMP_MAP_LEVEL,
+ .procname = "perip_stats_diagnose",
+ .data = &snmp_map_level,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = snmp_map_level_handler,
+ .strategy = &sysctl_intvec,
+ },
+#endif
{ .ctl_name = 0 }
};
static struct ctl_table ipv4_net_table[] = {
--
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