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4222. [func] Bias IPv6 servers when selecting the next server to

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query. [RT #40836]
This commit is contained in:
Mark Andrews 2015-09-28 18:57:19 +10:00
parent 8d80b4939d
commit 98a7f8c7ae
9 changed files with 86 additions and 25 deletions
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3
CHANGES
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@ -1,3 +1,6 @@
4222. [func] Bias IPv6 servers when selecting the next server to
query. [RT #40836]
4221. [bug] Resource leak on DNS_R_NXDOMAIN in fctx_create.
[RT #40583]

1
bin/named/config.c
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@ -184,6 +184,7 @@ options {\n\
allow-new-zones no;\n\
fetches-per-server 0;\n\
require-server-cookie no;\n\
v6-bias 50;\n\
"
#ifdef HAVE_GEOIP
"\

5
bin/named/server.c
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@ -3542,6 +3542,11 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
INSIST(result == ISC_R_SUCCESS);
view->requireservercookie = cfg_obj_asboolean(obj);
obj = NULL;
result = ns_config_get(maps, "v6-bias", &obj);
INSIST(result == ISC_R_SUCCESS);
view->v6bias = cfg_obj_asuint32(obj) * 1000;
obj = NULL;
result = ns_config_get(maps, "max-clients-per-query", &obj);
INSIST(result == ISC_R_SUCCESS);

12
doc/arm/Bv9ARM-book.xml
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@ -5035,6 +5035,7 @@ badresp:1,adberr:0,findfail:0,valfail:0]
<optional> min-ns-dots <replaceable>number</replaceable> </optional>
<optional> qname-wait-recurse <replaceable>yes_or_no</replaceable> </optional>
; </optional>
<optional>v6-bias <replaceable>number</replaceable> ; </optional>
};
</programlisting>
@ -9590,6 +9591,17 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>v6-bias</command></term>
<listitem>
<para>
When determining the next nameserver to try
preference IPv6 nameservers by this many milliseconds.
The default is <literal>50</literal> milliseconds.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect3>

2
doc/misc/options
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@ -314,6 +314,7 @@ options {
use-queryport-pool <boolean>; // obsolete
use-v4-udp-ports { <portrange>; ... };
use-v6-udp-ports { <portrange>; ... };
v6-bias <integer>;
version ( <quoted_string> | none );
zero-no-soa-ttl <boolean>;
zero-no-soa-ttl-cache <boolean>;
@ -587,6 +588,7 @@ view <string> [ <class> ] {
update-check-ksk <boolean>;
use-alt-transfer-source <boolean>;
use-queryport-pool <boolean>; // obsolete
v6-bias <integer>;
zero-no-soa-ttl <boolean>;
zero-no-soa-ttl-cache <boolean>;
zone <string> [ <class> ] {

1
lib/dns/include/dns/view.h
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@ -216,6 +216,7 @@ struct dns_view {
void (*cfg_destroy)(void **);
unsigned char secret[32]; /* Client secret */
unsigned int v6bias;
};
#define DNS_VIEW_MAGIC ISC_MAGIC('V','i','e','w')

52
lib/dns/resolver.c
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@ -2933,18 +2933,32 @@ add_bad(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo, isc_result_t reason,
* Sort addrinfo list by RTT.
*/
static void
sort_adbfind(dns_adbfind_t *find) {
sort_adbfind(dns_adbfind_t *find, unsigned int bias) {
dns_adbaddrinfo_t *best, *curr;
dns_adbaddrinfolist_t sorted;
int family;
/* Lame N^2 bubble sort. */
ISC_LIST_INIT(sorted);
while (!ISC_LIST_EMPTY(find->list)) {
best = ISC_LIST_HEAD(find->list);
family = isc_sockaddr_pf(&best->sockaddr);
curr = ISC_LIST_NEXT(best, publink);
while (curr != NULL) {
if (curr->srtt < best->srtt)
best = curr;
if (isc_sockaddr_pf(&curr->sockaddr) == family) {
if (curr->srtt < best->srtt)
best = curr;
} else if (family == AF_INET6) {
if (curr->srtt + bias < best->srtt) {
best = curr;
family = AF_INET;
}
} else {
if (curr->srtt < best->srtt + bias) {
best = curr;
family = AF_INET6;
}
}
curr = ISC_LIST_NEXT(curr, publink);
}
ISC_LIST_UNLINK(find->list, best, publink);
@ -2957,16 +2971,17 @@ sort_adbfind(dns_adbfind_t *find) {
* Sort a list of finds by server RTT.
*/
static void
sort_finds(dns_adbfindlist_t *findlist) {
sort_finds(dns_adbfindlist_t *findlist, unsigned int bias) {
dns_adbfind_t *best, *curr;
dns_adbfindlist_t sorted;
dns_adbaddrinfo_t *addrinfo, *bestaddrinfo;
int family;
/* Sort each find's addrinfo list by SRTT. */
for (curr = ISC_LIST_HEAD(*findlist);
curr != NULL;
curr = ISC_LIST_NEXT(curr, publink))
sort_adbfind(curr);
sort_adbfind(curr, bias);
/* Lame N^2 bubble sort. */
ISC_LIST_INIT(sorted);
@ -2974,13 +2989,30 @@ sort_finds(dns_adbfindlist_t *findlist) {
best = ISC_LIST_HEAD(*findlist);
bestaddrinfo = ISC_LIST_HEAD(best->list);
INSIST(bestaddrinfo != NULL);
family = isc_sockaddr_pf(&bestaddrinfo->sockaddr);
curr = ISC_LIST_NEXT(best, publink);
while (curr != NULL) {
addrinfo = ISC_LIST_HEAD(curr->list);
INSIST(addrinfo != NULL);
if (addrinfo->srtt < bestaddrinfo->srtt) {
best = curr;
bestaddrinfo = addrinfo;
if (isc_sockaddr_pf(&addrinfo->sockaddr) == family) {
if (addrinfo->srtt < bestaddrinfo->srtt) {
best = curr;
bestaddrinfo = addrinfo;
}
} else if (family == AF_INET6) {
if (addrinfo->srtt + bias <
bestaddrinfo->srtt) {
best = curr;
bestaddrinfo = addrinfo;
family = AF_INET;
}
} else {
if (addrinfo->srtt <
bestaddrinfo->srtt + bias) {
best = curr;
bestaddrinfo = addrinfo;
family = AF_INET6;
}
}
curr = ISC_LIST_NEXT(curr, publink);
}
@ -3394,8 +3426,8 @@ fctx_getaddresses(fetchctx_t *fctx, isc_boolean_t badcache) {
* We've found some addresses. We might still be looking
* for more addresses.
*/
sort_finds(&fctx->finds);
sort_finds(&fctx->altfinds);
sort_finds(&fctx->finds, res->view->v6bias);
sort_finds(&fctx->altfinds, 0);
result = ISC_R_SUCCESS;
}

1
lib/dns/view.c
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@ -240,6 +240,7 @@ dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
view->cfg_destroy = NULL;
view->fail_ttl = 0;
view->failcache = NULL;
view->v6bias = 0;
dns_badcache_init(view->mctx, DNS_VIEW_FAILCACHESIZE, &view->failcache);
if (isc_bind9) {

34
lib/isccfg/namedconf.c
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@ -1578,6 +1578,18 @@ view_clauses[] = {
{ "fetch-quota-params", &cfg_type_fetchquota, 0 },
{ "fetches-per-server", &cfg_type_fetchesper, 0 },
{ "fetches-per-zone", &cfg_type_fetchesper, 0 },
#ifdef ALLOW_FILTER_AAAA
{ "filter-aaaa", &cfg_type_bracketed_aml, 0 },
{ "filter-aaaa-on-v4", &cfg_type_filter_aaaa, 0 },
{ "filter-aaaa-on-v6", &cfg_type_filter_aaaa, 0 },
#else
{ "filter-aaaa", &cfg_type_bracketed_aml,
CFG_CLAUSEFLAG_NOTCONFIGURED },
{ "filter-aaaa-on-v4", &cfg_type_filter_aaaa,
CFG_CLAUSEFLAG_NOTCONFIGURED },
{ "filter-aaaa-on-v6", &cfg_type_filter_aaaa,
CFG_CLAUSEFLAG_NOTCONFIGURED },
#endif
{ "ixfr-from-differences", &cfg_type_ixfrdifftype, 0 },
{ "lame-ttl", &cfg_type_ttlval, 0 },
{ "nocookie-udp-size", &cfg_type_uint32, 0 },
@ -1608,11 +1620,13 @@ view_clauses[] = {
{ "queryport-pool-ports", &cfg_type_uint32, CFG_CLAUSEFLAG_OBSOLETE },
{ "queryport-pool-updateinterval", &cfg_type_uint32,
CFG_CLAUSEFLAG_OBSOLETE },
{ "rate-limit", &cfg_type_rrl, 0 },
{ "recursion", &cfg_type_boolean, 0 },
{ "request-sit", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
{ "request-nsid", &cfg_type_boolean, 0 },
{ "require-server-cookie", &cfg_type_boolean, 0 },
{ "resolver-query-timeout", &cfg_type_uint32, 0 },
{ "response-policy", &cfg_type_rpz, 0 },
{ "rfc2308-type1", &cfg_type_boolean, CFG_CLAUSEFLAG_NYI },
{ "root-delegation-only", &cfg_type_optional_exclude, 0 },
{ "rrset-order", &cfg_type_rrsetorder, 0 },
@ -1623,21 +1637,8 @@ view_clauses[] = {
{ "topology", &cfg_type_bracketed_aml, CFG_CLAUSEFLAG_NOTIMP },
{ "transfer-format", &cfg_type_transferformat, 0 },
{ "use-queryport-pool", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
{ "v6-bias", &cfg_type_uint32, 0 },
{ "zero-no-soa-ttl-cache", &cfg_type_boolean, 0 },
#ifdef ALLOW_FILTER_AAAA
{ "filter-aaaa", &cfg_type_bracketed_aml, 0 },
{ "filter-aaaa-on-v4", &cfg_type_filter_aaaa, 0 },
{ "filter-aaaa-on-v6", &cfg_type_filter_aaaa, 0 },
#else
{ "filter-aaaa", &cfg_type_bracketed_aml,
CFG_CLAUSEFLAG_NOTCONFIGURED },
{ "filter-aaaa-on-v4", &cfg_type_filter_aaaa,
CFG_CLAUSEFLAG_NOTCONFIGURED },
{ "filter-aaaa-on-v6", &cfg_type_filter_aaaa,
CFG_CLAUSEFLAG_NOTCONFIGURED },
#endif
{ "response-policy", &cfg_type_rpz, 0 },
{ "rate-limit", &cfg_type_rrl, 0 },
{ NULL, NULL, 0 }
};
@ -1815,8 +1816,11 @@ view_clausesets[] = {
zone_clauses,
NULL
};
static cfg_type_t cfg_type_viewopts = {
"view", cfg_parse_map, cfg_print_map, cfg_doc_map, &cfg_rep_map, view_clausesets };
"view", cfg_parse_map, cfg_print_map, cfg_doc_map, &cfg_rep_map,
view_clausesets
};
/*% The "zone" statement syntax. */