#include <config.h>
#include <string.h>
#include <isc/atomic.h>
#include <isc/buffer.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/platform.h>
#include <isc/print.h>
#include <isc/rwlock.h>
#include <isc/util.h>
#include <dns/opcode.h>
#include <dns/rdatatype.h>
#include <dns/stats.h>
#define DNS_STATS_MAGIC ISC_MAGIC('D', 's', 't', 't')
#define DNS_STATS_VALID(x) ISC_MAGIC_VALID(x, DNS_STATS_MAGIC)
typedef enum {
dns_statstype_general = 0,
dns_statstype_rdtype = 1,
dns_statstype_rdataset = 2,
dns_statstype_opcode = 3
} dns_statstype_t;
enum {
rdtypecounter_dlv = 256,
rdtypecounter_others = 257,
rdtypecounter_max = 258,
rdtypenxcounter_max = rdtypecounter_max * 2,
rdtypecounter_nxdomain = rdtypenxcounter_max,
rdatasettypecounter_max = rdtypecounter_nxdomain + 1
};
#ifndef DNS_STATS_USEMULTIFIELDS
#if defined(ISC_RWLOCK_USEATOMIC) && defined(ISC_PLATFORM_HAVEXADD) && !defined(ISC_PLATFORM_HAVEXADDQ)
#define DNS_STATS_USEMULTIFIELDS 1
#else
#define DNS_STATS_USEMULTIFIELDS 0
#endif
#endif
#if DNS_STATS_USEMULTIFIELDS
typedef struct {
isc_uint32_t hi;
isc_uint32_t lo;
} dns_stat_t;
#else
typedef isc_uint64_t dns_stat_t;
#endif
struct dns_stats {
unsigned int magic;
dns_statstype_t type;
isc_mem_t *mctx;
int ncounters;
isc_mutex_t lock;
unsigned int references;
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_t counterlock;
#endif
dns_stat_t *counters;
isc_uint64_t *copiedcounters;
};
static isc_result_t
create_stats(isc_mem_t *mctx, dns_statstype_t type, int ncounters,
dns_stats_t **statsp)
{
dns_stats_t *stats;
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(statsp != NULL && *statsp == NULL);
stats = isc_mem_get(mctx, sizeof(*stats));
if (stats == NULL)
return (ISC_R_NOMEMORY);
result = isc_mutex_init(&stats->lock);
if (result != ISC_R_SUCCESS)
goto clean_stats;
stats->counters = isc_mem_get(mctx, sizeof(dns_stat_t) * ncounters);
if (stats->counters == NULL) {
result = ISC_R_NOMEMORY;
goto clean_mutex;
}
stats->copiedcounters = isc_mem_get(mctx,
sizeof(isc_uint64_t) * ncounters);
if (stats->copiedcounters == NULL) {
result = ISC_R_NOMEMORY;
goto clean_counters;
}
#ifdef ISC_RWLOCK_USEATOMIC
result = isc_rwlock_init(&stats->counterlock, 0, 0);
if (result != ISC_R_SUCCESS)
goto clean_copiedcounters;
#endif
stats->type = type;
stats->references = 1;
memset(stats->counters, 0, sizeof(dns_stat_t) * ncounters);
stats->mctx = NULL;
isc_mem_attach(mctx, &stats->mctx);
stats->ncounters = ncounters;
stats->magic = DNS_STATS_MAGIC;
*statsp = stats;
return (result);
clean_counters:
isc_mem_put(mctx, stats->counters, sizeof(dns_stat_t) * ncounters);
#ifdef ISC_RWLOCK_USEATOMIC
clean_copiedcounters:
isc_mem_put(mctx, stats->copiedcounters,
sizeof(dns_stat_t) * ncounters);
#endif
clean_mutex:
DESTROYLOCK(&stats->lock);
clean_stats:
isc_mem_put(mctx, stats, sizeof(*stats));
return (result);
}
void
dns_stats_attach(dns_stats_t *stats, dns_stats_t **statsp) {
REQUIRE(DNS_STATS_VALID(stats));
REQUIRE(statsp != NULL && *statsp == NULL);
LOCK(&stats->lock);
stats->references++;
UNLOCK(&stats->lock);
*statsp = stats;
}
void
dns_stats_detach(dns_stats_t **statsp) {
dns_stats_t *stats;
REQUIRE(statsp != NULL && DNS_STATS_VALID(*statsp));
stats = *statsp;
*statsp = NULL;
LOCK(&stats->lock);
stats->references--;
UNLOCK(&stats->lock);
if (stats->references == 0) {
isc_mem_put(stats->mctx, stats->copiedcounters,
sizeof(dns_stat_t) * stats->ncounters);
isc_mem_put(stats->mctx, stats->counters,
sizeof(dns_stat_t) * stats->ncounters);
DESTROYLOCK(&stats->lock);
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_destroy(&stats->counterlock);
#endif
isc_mem_putanddetach(&stats->mctx, stats, sizeof(*stats));
}
}
static inline void
incrementcounter(dns_stats_t *stats, int counter) {
isc_int32_t prev;
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_lock(&stats->counterlock, isc_rwlocktype_read);
#endif
#if DNS_STATS_USEMULTIFIELDS
prev = isc_atomic_xadd((isc_int32_t *)&stats->counters[counter].lo, 1);
if (prev == (isc_int32_t)0xffffffff)
isc_atomic_xadd((isc_int32_t *)&stats->counters[counter].hi, 1);
#elif defined(ISC_PLATFORM_HAVEXADDQ)
UNUSED(prev);
isc_atomic_xaddq((isc_int64_t *)&stats->counters[counter], 1);
#else
UNUSED(prev);
stats->counters[counter]++;
#endif
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_unlock(&stats->counterlock, isc_rwlocktype_read);
#endif
}
static inline void
decrementcounter(dns_stats_t *stats, int counter) {
isc_int32_t prev;
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_lock(&stats->counterlock, isc_rwlocktype_read);
#endif
#if DNS_STATS_USEMULTIFIELDS
prev = isc_atomic_xadd((isc_int32_t *)&stats->counters[counter].lo, -1);
if (prev == 0)
isc_atomic_xadd((isc_int32_t *)&stats->counters[counter].hi,
-1);
#elif defined(ISC_PLATFORM_HAVEXADDQ)
UNUSED(prev);
isc_atomic_xaddq((isc_int64_t *)&stats->counters[counter], -1);
#else
UNUSED(prev);
stats->counters[counter]--;
#endif
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_unlock(&stats->counterlock, isc_rwlocktype_read);
#endif
}
static void
copy_counters(dns_stats_t *stats) {
int i;
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_lock(&stats->counterlock, isc_rwlocktype_write);
#endif
#if DNS_STATS_USEMULTIFIELDS
for (i = 0; i < stats->ncounters; i++) {
stats->copiedcounters[i] =
(isc_uint64_t)(stats->counters[i].hi) << 32 |
stats->counters[i].lo;
}
#else
UNUSED(i);
memcpy(stats->copiedcounters, stats->counters,
stats->ncounters * sizeof(dns_stat_t));
#endif
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_unlock(&stats->counterlock, isc_rwlocktype_write);
#endif
}
isc_result_t
dns_generalstats_create(isc_mem_t *mctx, dns_stats_t **statsp, int ncounters) {
REQUIRE(statsp != NULL && *statsp == NULL);
return (create_stats(mctx, dns_statstype_general, ncounters, statsp));
}
isc_result_t
dns_rdatatypestats_create(isc_mem_t *mctx, dns_stats_t **statsp) {
REQUIRE(statsp != NULL && *statsp == NULL);
return (create_stats(mctx, dns_statstype_rdtype, rdtypecounter_max,
statsp));
}
isc_result_t
dns_rdatasetstats_create(isc_mem_t *mctx, dns_stats_t **statsp) {
REQUIRE(statsp != NULL && *statsp == NULL);
return (create_stats(mctx, dns_statstype_rdataset,
(rdtypecounter_max * 2) + 1, statsp));
}
isc_result_t
dns_opcodestats_create(isc_mem_t *mctx, dns_stats_t **statsp) {
REQUIRE(statsp != NULL && *statsp == NULL);
return (create_stats(mctx, dns_statstype_opcode, 16, statsp));
}
void
dns_generalstats_increment(dns_stats_t *stats, dns_statscounter_t counter) {
REQUIRE(DNS_STATS_VALID(stats) && stats->type == dns_statstype_general);
REQUIRE(counter < stats->ncounters);
incrementcounter(stats, (int)counter);
}
void
dns_rdatatypestats_increment(dns_stats_t *stats, dns_rdatatype_t type) {
int counter;
REQUIRE(DNS_STATS_VALID(stats) && stats->type == dns_statstype_rdtype);
if (type == dns_rdatatype_dlv)
counter = rdtypecounter_dlv;
else if (type > dns_rdatatype_any)
counter = rdtypecounter_others;
else
counter = (int)type;
incrementcounter(stats, counter);
}
static inline void
update_rdatasetstats(dns_stats_t *stats, dns_rdatastatstype_t rrsettype,
isc_boolean_t increment)
{
int counter;
dns_rdatatype_t rdtype;
if ((DNS_RDATASTATSTYPE_ATTR(rrsettype) &
DNS_RDATASTATSTYPE_ATTR_NXDOMAIN) != 0) {
counter = rdtypecounter_nxdomain;
} else {
rdtype = DNS_RDATASTATSTYPE_BASE(rrsettype);
if (rdtype == dns_rdatatype_dlv)
counter = (int)rdtypecounter_dlv;
else if (rdtype > dns_rdatatype_any)
counter = (int)rdtypecounter_others;
else
counter = (int)rdtype;
if ((DNS_RDATASTATSTYPE_ATTR(rrsettype) &
DNS_RDATASTATSTYPE_ATTR_NXRRSET) != 0)
counter += rdtypecounter_max;
}
if (increment)
incrementcounter(stats, counter);
else
decrementcounter(stats, counter);
}
void
dns_rdatasetstats_increment(dns_stats_t *stats, dns_rdatastatstype_t rrsettype)
{
REQUIRE(DNS_STATS_VALID(stats) &&
stats->type == dns_statstype_rdataset);
update_rdatasetstats(stats, rrsettype, ISC_TRUE);
}
void
dns_rdatasetstats_decrement(dns_stats_t *stats, dns_rdatastatstype_t rrsettype)
{
REQUIRE(DNS_STATS_VALID(stats) &&
stats->type == dns_statstype_rdataset);
update_rdatasetstats(stats, rrsettype, ISC_FALSE);
}
void
dns_opcodestats_increment(dns_stats_t *stats, dns_opcode_t code) {
REQUIRE(DNS_STATS_VALID(stats) && stats->type == dns_statstype_opcode);
incrementcounter(stats, (int)code);
}
void
dns_generalstats_dump(dns_stats_t *stats, dns_generalstats_dumper_t dump_fn,
void *arg, unsigned int options)
{
int i;
REQUIRE(DNS_STATS_VALID(stats) && stats->type == dns_statstype_general);
copy_counters(stats);
for (i = 0; i < stats->ncounters; i++) {
if ((options & DNS_STATSDUMP_VERBOSE) == 0 &&
stats->copiedcounters[i] == 0)
continue;
dump_fn(i, stats->copiedcounters[i], arg);
}
}
static void
dump_rdentry(dns_stats_t *stats, int counter, int rdcounter,
dns_rdatastatstype_t attributes,
dns_rdatatypestats_dumper_t dump_fn, void * arg,
unsigned int options)
{
dns_rdatatype_t rdtype = dns_rdatatype_none;
dns_rdatastatstype_t type;
if ((options & DNS_STATSDUMP_VERBOSE) == 0 &&
stats->copiedcounters[counter] == 0)
return;
if (rdcounter == rdtypecounter_others)
attributes |= DNS_RDATASTATSTYPE_ATTR_OTHERTYPE;
else {
if (rdcounter == rdtypecounter_dlv)
rdtype = dns_rdatatype_dlv;
else
rdtype = (dns_rdatatype_t)rdcounter;
}
type = DNS_RDATASTATSTYPE_VALUE((dns_rdatastatstype_t)rdtype,
attributes);
dump_fn(type, stats->copiedcounters[counter], arg);
}
void
dns_rdatatypestats_dump(dns_stats_t *stats, dns_rdatatypestats_dumper_t dump_fn,
void *arg, unsigned int options)
{
int i;
REQUIRE(DNS_STATS_VALID(stats) && stats->type == dns_statstype_rdtype);
copy_counters(stats);
for (i = 0; i < stats->ncounters; i++)
dump_rdentry(stats, i, i, 0, dump_fn, arg, options);
}
void
dns_rdatasetstats_dump(dns_stats_t *stats, dns_rdatatypestats_dumper_t dump_fn,
void *arg, unsigned int options)
{
int i;
REQUIRE(DNS_STATS_VALID(stats) &&
stats->type == dns_statstype_rdataset);
copy_counters(stats);
for (i = 0; i < rdtypecounter_max; i++)
dump_rdentry(stats, i, i, 0, dump_fn, arg, options);
for (i = rdtypecounter_max; i < rdtypenxcounter_max; i++) {
dump_rdentry(stats, i, i - rdtypecounter_max,
DNS_RDATASTATSTYPE_ATTR_NXRRSET,
dump_fn, arg, options);
}
dump_rdentry(stats, rdtypecounter_nxdomain, 0,
DNS_RDATASTATSTYPE_ATTR_NXDOMAIN, dump_fn, arg, options);
INSIST(i < stats->ncounters);
}
void
dns_opcodestats_dump(dns_stats_t *stats, dns_opcodestats_dumper_t dump_fn,
void *arg, unsigned int options)
{
int i;
REQUIRE(DNS_STATS_VALID(stats) && stats->type == dns_statstype_opcode);
copy_counters(stats);
for (i = 0; i < stats->ncounters; i++) {
if ((options & DNS_STATSDUMP_VERBOSE) == 0 &&
stats->copiedcounters[i] == 0)
continue;
dump_fn((dns_opcode_t)i, stats->copiedcounters[i], arg);
}
}
LIBDNS_EXTERNAL_DATA const char *dns_statscounter_names[DNS_STATS_NCOUNTERS] =
{
"success",
"referral",
"nxrrset",
"nxdomain",
"recursion",
"failure",
"duplicate",
"dropped"
};
isc_result_t
dns_stats_alloccounters(isc_mem_t *mctx, isc_uint64_t **ctrp) {
int i;
isc_uint64_t *p =
isc_mem_get(mctx, DNS_STATS_NCOUNTERS * sizeof(isc_uint64_t));
if (p == NULL)
return (ISC_R_NOMEMORY);
for (i = 0; i < DNS_STATS_NCOUNTERS; i++)
p[i] = 0;
*ctrp = p;
return (ISC_R_SUCCESS);
}
void
dns_stats_freecounters(isc_mem_t *mctx, isc_uint64_t **ctrp) {
isc_mem_put(mctx, *ctrp, DNS_STATS_NCOUNTERS * sizeof(isc_uint64_t));
*ctrp = NULL;
}