Gecko [ www.corporacionhdm.com.pe ]

Name	Size	Permission	Date
acache.h	13.9 KB	-rw-r--r--	2025-02-20 09:05
acl.h	7.07 KB	-rw-r--r--	2025-02-20 09:05
adb.h	22.07 KB	-rw-r--r--	2025-02-20 09:05
badcache.h	3.29 KB	-rw-r--r--	2025-02-20 09:05
bit.h	807 B	-rw-r--r--	2025-02-20 09:05
byaddr.h	3.91 KB	-rw-r--r--	2025-02-20 09:05
cache.h	8.44 KB	-rw-r--r--	2025-02-20 09:05
callbacks.h	2.22 KB	-rw-r--r--	2025-02-20 09:05
catz.h	11.56 KB	-rw-r--r--	2025-02-20 09:05
cert.h	1.43 KB	-rw-r--r--	2025-02-20 09:05
client.h	21.53 KB	-rw-r--r--	2025-02-20 09:05
clientinfo.h	1.96 KB	-rw-r--r--	2025-02-20 09:05
compress.h	6.49 KB	-rw-r--r--	2025-02-20 09:05
db.h	45.48 KB	-rw-r--r--	2025-02-20 09:05
dbiterator.h	7.25 KB	-rw-r--r--	2025-02-20 09:05
dbtable.h	3.09 KB	-rw-r--r--	2025-02-20 09:05
diff.h	6.82 KB	-rw-r--r--	2025-02-20 09:05
dispatch.h	16.04 KB	-rw-r--r--	2025-02-20 09:05
dlz.h	10.37 KB	-rw-r--r--	2025-02-20 09:05
dlz_dlopen.h	4.57 KB	-rw-r--r--	2025-02-20 09:05
dns64.h	5.5 KB	-rw-r--r--	2025-02-20 09:05
dnssec.h	11.83 KB	-rw-r--r--	2025-02-20 09:05
dnstap.h	9.14 KB	-rw-r--r--	2025-02-20 09:05
ds.h	1.2 KB	-rw-r--r--	2025-02-20 09:05
dsdigest.h	1.68 KB	-rw-r--r--	2025-02-20 09:05
dyndb.h	4.72 KB	-rw-r--r--	2025-02-20 09:05
ecdb.h	809 B	-rw-r--r--	2025-02-20 09:05
edns.h	722 B	-rw-r--r--	2025-02-20 09:05
enumclass.h	1.19 KB	-rw-r--r--	2025-02-20 09:05
enumtype.h	8.11 KB	-rw-r--r--	2025-02-20 09:05
events.h	3.96 KB	-rw-r--r--	2025-02-20 09:05
fixedname.h	1.62 KB	-rw-r--r--	2025-02-20 09:05
forward.h	3.37 KB	-rw-r--r--	2025-02-20 09:05
geoip.h	2.73 KB	-rw-r--r--	2025-02-20 09:05
ipkeylist.h	2.13 KB	-rw-r--r--	2025-02-20 09:05
iptable.h	1.58 KB	-rw-r--r--	2025-02-20 09:05
journal.h	8.03 KB	-rw-r--r--	2025-02-20 09:05
keydata.h	1.03 KB	-rw-r--r--	2025-02-20 09:05
keyflags.h	1.25 KB	-rw-r--r--	2025-02-20 09:05
keytable.h	9.24 KB	-rw-r--r--	2025-02-20 09:05
keyvalues.h	4.06 KB	-rw-r--r--	2025-02-20 09:05
lib.h	1.16 KB	-rw-r--r--	2025-02-20 09:05
log.h	3.87 KB	-rw-r--r--	2025-02-20 09:05
lookup.h	2.86 KB	-rw-r--r--	2025-02-20 09:05
master.h	11.02 KB	-rw-r--r--	2025-02-20 09:05
masterdump.h	12.35 KB	-rw-r--r--	2025-02-20 09:05
message.h	37.92 KB	-rw-r--r--	2025-02-20 09:05
name.h	36.25 KB	-rw-r--r--	2025-02-20 09:05
ncache.h	4.81 KB	-rw-r--r--	2025-02-20 09:05
nsec.h	2.86 KB	-rw-r--r--	2025-02-20 09:05
nsec3.h	7.84 KB	-rw-r--r--	2025-02-20 09:05
nta.h	4.44 KB	-rw-r--r--	2025-02-20 09:05
opcode.h	1007 B	-rw-r--r--	2025-02-20 09:05
order.h	1.95 KB	-rw-r--r--	2025-02-20 09:05
peer.h	5.83 KB	-rw-r--r--	2025-02-20 09:05
portlist.h	2.05 KB	-rw-r--r--	2025-02-20 09:05
private.h	1.89 KB	-rw-r--r--	2025-02-20 09:05
rbt.h	39.67 KB	-rw-r--r--	2025-02-20 09:05
rcode.h	2.42 KB	-rw-r--r--	2025-02-20 09:05
rdata.h	21.11 KB	-rw-r--r--	2025-02-20 09:05
rdataclass.h	2.2 KB	-rw-r--r--	2025-02-20 09:05
rdatalist.h	2.51 KB	-rw-r--r--	2025-02-20 09:05
rdataset.h	21.03 KB	-rw-r--r--	2025-02-20 09:05
rdatasetiter.h	3.83 KB	-rw-r--r--	2025-02-20 09:05
rdataslab.h	4.28 KB	-rw-r--r--	2025-02-20 09:05
rdatastruct.h	60.14 KB	-rw-r--r--	2025-02-20 09:05
rdatatype.h	2.24 KB	-rw-r--r--	2025-02-20 09:05
request.h	10.89 KB	-rw-r--r--	2025-02-20 09:05
resolver.h	19.75 KB	-rw-r--r--	2025-02-20 09:05
result.h	9.07 KB	-rw-r--r--	2025-02-20 09:05
rootns.h	892 B	-rw-r--r--	2025-02-20 09:05
rpz.h	10.09 KB	-rw-r--r--	2025-02-20 09:05
rriterator.h	4.13 KB	-rw-r--r--	2025-02-20 09:05
rrl.h	6.48 KB	-rw-r--r--	2025-02-20 09:05
sdb.h	7.05 KB	-rw-r--r--	2025-02-20 09:05
sdlz.h	13.88 KB	-rw-r--r--	2025-02-20 09:05
secalg.h	1.67 KB	-rw-r--r--	2025-02-20 09:05
secproto.h	1.52 KB	-rw-r--r--	2025-02-20 09:05
soa.h	2.13 KB	-rw-r--r--	2025-02-20 09:05
ssu.h	8.11 KB	-rw-r--r--	2025-02-20 09:05
stats.h	13.14 KB	-rw-r--r--	2025-02-20 09:05
tcpmsg.h	3.07 KB	-rw-r--r--	2025-02-20 09:05
time.h	1.66 KB	-rw-r--r--	2025-02-20 09:05
timer.h	1.03 KB	-rw-r--r--	2025-02-20 09:05
tkey.h	7.45 KB	-rw-r--r--	2025-02-20 09:05
tsec.h	2.88 KB	-rw-r--r--	2025-02-20 09:05
tsig.h	8.19 KB	-rw-r--r--	2025-02-20 09:05
ttl.h	1.9 KB	-rw-r--r--	2025-02-20 09:05
types.h	13.83 KB	-rw-r--r--	2025-02-20 09:05
update.h	1.61 KB	-rw-r--r--	2025-02-20 09:05
validator.h	6.99 KB	-rw-r--r--	2025-02-20 09:05
version.h	868 B	-rw-r--r--	2025-02-20 09:05
view.h	34.45 KB	-rw-r--r--	2025-02-20 09:05
xfrin.h	2.86 KB	-rw-r--r--	2025-02-20 09:05
zone.h	59.44 KB	-rw-r--r--	2025-02-20 09:05
zonekey.h	777 B	-rw-r--r--	2025-02-20 09:05
zt.h	5.43 KB	-rw-r--r--	2025-02-20 09:05

Rename

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef DNS_RRL_H
#define DNS_RRL_H 1

/*
 * Rate limit DNS responses.
 */

#include <inttypes.h>
#include <stdbool.h>

#include <isc/lang.h>

#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/types.h>

ISC_LANG_BEGINDECLS

/*
 * Memory allocation or other failures.
 */
#define DNS_RRL_LOG_FAIL	ISC_LOG_WARNING
/*
 * dropped or slipped responses.
 */
#define DNS_RRL_LOG_DROP	ISC_LOG_INFO
/*
 * Major events in dropping or slipping.
 */
#define DNS_RRL_LOG_DEBUG1	ISC_LOG_DEBUG(3)
/*
 * Limit computations.
 */
#define DNS_RRL_LOG_DEBUG2	ISC_LOG_DEBUG(4)
/*
 * Even less interesting.
 */
#define DNS_RRL_LOG_DEBUG3	ISC_LOG_DEBUG(9)

#define DNS_RRL_LOG_ERR_LEN	64
#define DNS_RRL_LOG_BUF_LEN	(sizeof("would continue limiting") +	\
				 DNS_RRL_LOG_ERR_LEN +			\
				 sizeof(" responses to ") +		\
				 ISC_NETADDR_FORMATSIZE +		\
				 sizeof("/128 for IN ") +		\
				 DNS_RDATATYPE_FORMATSIZE +		\
				 DNS_NAME_FORMATSIZE)

typedef struct dns_rrl_hash dns_rrl_hash_t;

/*
 * Response types.
 */
typedef enum {
	DNS_RRL_RTYPE_FREE = 0,
	DNS_RRL_RTYPE_QUERY,
	DNS_RRL_RTYPE_REFERRAL,
	DNS_RRL_RTYPE_NODATA,
	DNS_RRL_RTYPE_NXDOMAIN,
	DNS_RRL_RTYPE_ERROR,
	DNS_RRL_RTYPE_ALL,
	DNS_RRL_RTYPE_TCP,
} dns_rrl_rtype_t;

/*
 * A rate limit bucket key.
 * This should be small to limit the total size of the database.
 * The hash of the qname should be wide enough to make the probability
 * of collisions among requests from a single IP address block less than 50%.
 * We need a 32-bit hash value for 10000 qps (e.g. random qnames forged
 * by attacker) to collide with legitimate qnames from the target with
 * probability at most 1%.
 */
#define DNS_RRL_MAX_PREFIX  64
typedef union dns_rrl_key dns_rrl_key_t;
struct dns__rrl_key {
	uint32_t	    ip[DNS_RRL_MAX_PREFIX/32];
	uint32_t	    qname_hash;
	dns_rdatatype_t	    qtype;
	uint8_t         qclass;
	unsigned int	    rtype   :4; /* dns_rrl_rtype_t */
	unsigned int	    ipv6    :1;
};
union dns_rrl_key {
	struct dns__rrl_key s;
	uint16_t	w[sizeof(struct dns__rrl_key)/sizeof(uint16_t)];
};

/*
 * A rate-limit entry.
 * This should be small to limit the total size of the table of entries.
 */
typedef struct dns_rrl_entry dns_rrl_entry_t;
typedef ISC_LIST(dns_rrl_entry_t) dns_rrl_bin_t;
struct dns_rrl_entry {
	ISC_LINK(dns_rrl_entry_t) lru;
	ISC_LINK(dns_rrl_entry_t) hlink;
	dns_rrl_key_t	key;
# define DNS_RRL_RESPONSE_BITS	24
	signed int	responses   :DNS_RRL_RESPONSE_BITS;
# define DNS_RRL_QNAMES_BITS	8
	unsigned int	log_qname   :DNS_RRL_QNAMES_BITS;

# define DNS_RRL_TS_GEN_BITS	2
	unsigned int	ts_gen	    :DNS_RRL_TS_GEN_BITS;
	unsigned int	ts_valid    :1;
# define DNS_RRL_HASH_GEN_BITS	1
	unsigned int	hash_gen    :DNS_RRL_HASH_GEN_BITS;
	unsigned int	logged	    :1;
# define DNS_RRL_LOG_BITS	11
	unsigned int	log_secs    :DNS_RRL_LOG_BITS;

# define DNS_RRL_TS_BITS	12
	unsigned int	ts	    :DNS_RRL_TS_BITS;

# define DNS_RRL_MAX_SLIP	10
	unsigned int	slip_cnt    :4;
};

#define DNS_RRL_MAX_TIME_TRAVEL	5
#define DNS_RRL_FOREVER		(1<<DNS_RRL_TS_BITS)
#define DNS_RRL_MAX_TS		(DNS_RRL_FOREVER - 1)

#define DNS_RRL_MAX_RESPONSES	((1<<(DNS_RRL_RESPONSE_BITS-1))-1)
#define DNS_RRL_MAX_WINDOW	3600
#if DNS_RRL_MAX_WINDOW >= DNS_RRL_MAX_TS
#error "DNS_RRL_MAX_WINDOW is too large"
#endif
#define DNS_RRL_MAX_RATE	1000
#if DNS_RRL_MAX_RATE >= (DNS_RRL_MAX_RESPONSES / DNS_RRL_MAX_WINDOW)
#error "DNS_RRL_MAX_rate is too large"
#endif

#if (1<<DNS_RRL_LOG_BITS) >= DNS_RRL_FOREVER
#error DNS_RRL_LOG_BITS is too big
#endif
#define DNS_RRL_MAX_LOG_SECS	1800
#if DNS_RRL_MAX_LOG_SECS >= (1<<DNS_RRL_LOG_BITS)
#error "DNS_RRL_MAX_LOG_SECS is too large"
#endif
#define DNS_RRL_STOP_LOG_SECS	60
#if DNS_RRL_STOP_LOG_SECS >= (1<<DNS_RRL_LOG_BITS)
#error "DNS_RRL_STOP_LOG_SECS is too large"
#endif

/*
 * A hash table of rate-limit entries.
 */
struct dns_rrl_hash {
	isc_stdtime_t	check_time;
	unsigned int	gen	    :DNS_RRL_HASH_GEN_BITS;
	int		length;
	dns_rrl_bin_t	bins[1];
};

/*
 * A block of rate-limit entries.
 */
typedef struct dns_rrl_block dns_rrl_block_t;
struct dns_rrl_block {
	ISC_LINK(dns_rrl_block_t) link;
	int		size;
	dns_rrl_entry_t	entries[1];
};

/*
 * A rate limited qname buffer.
 */
typedef struct dns_rrl_qname_buf dns_rrl_qname_buf_t;
struct dns_rrl_qname_buf {
	ISC_LINK(dns_rrl_qname_buf_t) link;
	const dns_rrl_entry_t *e;
	unsigned int	    index;
	dns_fixedname_t	    qname;
};

typedef struct dns_rrl_rate dns_rrl_rate_t;
struct dns_rrl_rate {
	int	    r;
	int	    scaled;
	const char  *str;
};

/*
 * Per-view query rate limit parameters and a pointer to database.
 */
typedef struct dns_rrl dns_rrl_t;
struct dns_rrl {
	isc_mutex_t	lock;
	isc_mem_t	*mctx;

bool	log_only;
	dns_rrl_rate_t	responses_per_second;
	dns_rrl_rate_t	referrals_per_second;
	dns_rrl_rate_t	nodata_per_second;
	dns_rrl_rate_t	nxdomains_per_second;
	dns_rrl_rate_t	errors_per_second;
	dns_rrl_rate_t	all_per_second;
	dns_rrl_rate_t	slip;
	int		window;
	double		qps_scale;
	int		max_entries;

dns_acl_t	*exempt;

int		num_entries;

int		qps_responses;
	isc_stdtime_t	qps_time;
	double		qps;

unsigned int	probes;
	unsigned int	searches;

ISC_LIST(dns_rrl_block_t) blocks;
	ISC_LIST(dns_rrl_entry_t) lru;

dns_rrl_hash_t	*hash;
	dns_rrl_hash_t	*old_hash;
	unsigned int	hash_gen;

unsigned int	ts_gen;
# define DNS_RRL_TS_BASES   (1<<DNS_RRL_TS_GEN_BITS)
	isc_stdtime_t	ts_bases[DNS_RRL_TS_BASES];

int		ipv4_prefixlen;
	uint32_t	ipv4_mask;
	int		ipv6_prefixlen;
	uint32_t	ipv6_mask[4];

isc_stdtime_t	log_stops_time;
	dns_rrl_entry_t	*last_logged;
	int		num_logged;
	int		num_qnames;
	ISC_LIST(dns_rrl_qname_buf_t) qname_free;
# define DNS_RRL_QNAMES	    (1<<DNS_RRL_QNAMES_BITS)
	dns_rrl_qname_buf_t *qnames[DNS_RRL_QNAMES];
};

typedef enum {
	DNS_RRL_RESULT_OK,
	DNS_RRL_RESULT_DROP,
	DNS_RRL_RESULT_SLIP,
} dns_rrl_result_t;

dns_rrl_result_t
dns_rrl(dns_view_t *view,
	const isc_sockaddr_t *client_addr, bool is_tcp,
	dns_rdataclass_t rdclass, dns_rdatatype_t qtype,
	dns_name_t *qname, isc_result_t resp_result, isc_stdtime_t now,
	bool wouldlog, char *log_buf, unsigned int log_buf_len);

void
dns_rrl_view_destroy(dns_view_t *view);

isc_result_t
dns_rrl_init(dns_rrl_t **rrlp, dns_view_t *view, int min_entries);

ISC_LANG_ENDDECLS

#endif /* DNS_RRL_H */