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[master] DDoS mitigation features

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3938.	[func]		Added quotas to be used in recursive resolvers
			that are under high query load for names in zones
			whose authoritative servers are nonresponsive or
			are experiencing a denial of service attack.

			- "fetches-per-server" limits the number of
			  simultaneous queries that can be sent to any
			  single authoritative server.  The configured
			  value is a starting point; it is automatically
			  adjusted downward if the server is partially or
			  completely non-responsive. The algorithm used to
			  adjust the quota can be configured via the
			  "fetch-quota-params" option.
			- "fetches-per-zone" limits the number of
			  simultaneous queries that can be sent for names
			  within a single domain.  (Note: Unlike
			  "fetches-per-server", this value is not
			  self-tuning.)
			- New stats counters have been added to count
			  queries spilled due to these quotas.

			See the ARM for details of these options. [RT #37125]
This commit is contained in:
Evan Hunt
2015-07-08 22:53:39 -07:00
parent e8f98ec8d4
commit 1479200aa0
41 changed files with 1976 additions and 102 deletions
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lib/dns/view.c
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@@ -731,7 +731,8 @@ dns_view_createzonetable(dns_view_t *view) {
isc_result_t
dns_view_createresolver(dns_view_t *view,
isc_taskmgr_t *taskmgr,
unsigned int ntasks, unsigned int ndisp,
unsigned int ntasks,
unsigned int ndisp,
isc_socketmgr_t *socketmgr,
isc_timermgr_t *timermgr,
unsigned int options,