EDNS0 client subnet support for BIND

0001-EDNS0-client-subnet-support.patch

From 83f0062d385fd4f111b31c1f26b571cabd7e0e4c Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent.bernat@dailymotion.com>
Date: Thu, 5 Sep 2013 16:52:45 +0200
Subject: [PATCH] EDNS0 client subnet support.

---
 bin/named/client.c               | 227 +++++++++++++++++++++++++++++++--------
 bin/named/include/named/client.h |   4 +
 bin/named/include/named/server.h |  81 +++++++-------
 bin/named/sortlist.c             |   4 +-
 bin/named/statschannel.c         |   2 +
 lib/dns/acl.c                    |  86 ++++++++++-----
 lib/dns/include/dns/acl.h        |  18 ++++
 7 files changed, 312 insertions(+), 110 deletions(-)

diff --git a/bin/named/client.c b/bin/named/client.c
index 2115ac1..f5db80e 100644
--- a/bin/named/client.c
+++ b/bin/named/client.c
@@ -1188,6 +1188,8 @@ client_addopt(ns_client_t *client) {
 	dns_view_t *view;
 	dns_resolver_t *resolver;
 	isc_uint16_t udpsize;
+	isc_buffer_t *buffer = NULL;
+	char nsid[BUFSIZ], *nsidp = NULL;
 
 	REQUIRE(client->opt == NULL);	/* XXXRTH free old. */
 
@@ -1225,6 +1227,20 @@ client_addopt(ns_client_t *client) {
 	rdatalist->ttl = (client->extflags & DNS_MESSAGEEXTFLAG_REPLYPRESERVE);
 
 	/* Set EDNS options if applicable */
+	rdata->data = NULL;
+	rdata->length = 0;
+	if (client->clientaddrlen) {
+		/* Client subnet */
+		/* What to do when scope is 0? If we keep 0, we will
+		 * provide an answer valid for any IP address. If we
+		 * don't provide a client subnet, all the same. So we
+		 * have to do something sensible. We assume that we
+		 * did use client subnet. TODO: add a flag to check
+		 * that we have a geoenabled view. */
+		if (client->clientscopelen == 0)
+			client->clientscopelen = client->clientaddrlen;
+		rdata->length += 8 + (client->clientaddrlen + 7) / 8;
+	}
 	if (client->attributes & NS_CLIENTATTR_WANTNSID &&
 	    (ns_g_server->server_id != NULL ||
 	     ns_g_server->server_usehostname)) {
@@ -1234,36 +1250,49 @@ client_addopt(ns_client_t *client) {
 		 * + 2 bytes for NSID length
 		 * + NSID itself
 		 */
-		char nsid[BUFSIZ], *nsidp;
-		isc_buffer_t *buffer = NULL;
-
 		if (ns_g_server->server_usehostname) {
 			isc_result_t result;
 			result = ns_os_gethostname(nsid, sizeof(nsid));
-			if (result != ISC_R_SUCCESS) {
-				goto no_nsid;
+			if (result == ISC_R_SUCCESS) {
+				nsidp = nsid;
 			}
-			nsidp = nsid;
 		} else
 			nsidp = ns_g_server->server_id;
 
-		rdata->length = strlen(nsidp) + 4;
-		result = isc_buffer_allocate(client->mctx, &buffer,
-					     rdata->length);
-		if (result != ISC_R_SUCCESS)
-			goto no_nsid;
-
+		if (nsidp)
+			rdata->length += strlen(nsidp) + 4;
+	}
+
+	result = isc_buffer_allocate(client->mctx, &buffer,
+				     rdata->length);
+	if (result != ISC_R_SUCCESS) goto no_opt;
+	if (client->clientaddrlen) {
+		int addrbytes = (client->clientaddrlen + 7) / 8;
+		isc_uint8_t *paddr;
+		int i;
+		isc_buffer_putuint16(buffer, DNS_OPT_CLIENT_SUBNET);
+		isc_buffer_putuint16(buffer, 4 + addrbytes);
+		isc_buffer_putuint16(buffer,
+				     (client->clientaddr.family == AF_INET)?1:2);
+		isc_buffer_putuint8(buffer, client->clientaddrlen);
+		isc_buffer_putuint8(buffer, client->clientscopelen);
+		paddr = (isc_uint8_t*)&client->clientaddr.type;
+		for (i = 0; i < addrbytes; i++) {
+			isc_buffer_putuint8(buffer,
+					    paddr[i] & ((i == addrbytes - 1 &&
+							 (client->clientaddrlen % 8))?
+							(1 << (8 - (client->clientaddrlen % 8))):
+							0xff));
+		}
+	}
+	if (nsidp) {
 		isc_buffer_putuint16(buffer, DNS_OPT_NSID);
 		isc_buffer_putuint16(buffer, strlen(nsidp));
 		isc_buffer_putstr(buffer, nsidp);
-		rdata->data = buffer->base;
-		dns_message_takebuffer(client->message, &buffer);
-	} else {
-no_nsid:
-		rdata->data = NULL;
-		rdata->length = 0;
 	}
-
+	rdata->data = buffer->base;
+	dns_message_takebuffer(client->message, &buffer);
+no_opt:
 	rdata->rdclass = rdatalist->rdclass;
 	rdata->type = rdatalist->type;
 	rdata->flags = 0;
@@ -1279,14 +1308,17 @@ no_nsid:
 }
 
 static inline isc_boolean_t
-allowed(isc_netaddr_t *addr, dns_name_t *signer, dns_acl_t *acl) {
+allowed(isc_netaddr_t *addr, isc_netaddr_t *clientaddr,
+	isc_uint8_t *scope,
+	dns_name_t *signer, dns_acl_t *acl) {
 	int match;
 	isc_result_t result;
 
 	if (acl == NULL)
 		return (ISC_TRUE);
-	result = dns_acl_match(addr, signer, acl, &ns_g_server->aclenv,
-			       &match, NULL);
+	result = dns_acl_match_with_client(addr, clientaddr, scope,
+					   signer, acl, &ns_g_server->aclenv,
+					   &match, NULL);
 	if (result == ISC_R_SUCCESS && match > 0)
 		return (ISC_TRUE);
 	return (ISC_FALSE);
@@ -1349,14 +1381,91 @@ ns_client_isself(dns_view_t *myview, dns_tsigkey_t *mykey,
 			tsig = dns_tsigkey_identity(mykey);
 		}
 
-		if (allowed(&netsrc, tsig, view->matchclients) &&
-		    allowed(&netdst, tsig, view->matchdestinations))
+		if (allowed(&netsrc, NULL, NULL, tsig, view->matchclients) &&
+		    allowed(&netdst, NULL, NULL, tsig, view->matchdestinations))
 			break;
 	}
 	return (ISC_TF(view == myview));
 }
 
 /*
+ * Parse EDNS0 client subnet option. `optlen` is the length of the
+ * option after the code and the length. It will be updated to reflect
+ * with what has been read.
+ */
+static isc_result_t
+client_parse_clientsubnet(ns_client_t *client, isc_buffer_t *rdbuf, isc_uint16_t *optlen) {
+	isc_uint16_t family;
+	isc_uint8_t addrlen;	/* Source netmask */
+	isc_uint8_t addrbytes;
+	isc_uint8_t scopelen;	/* Scope netmask */
+	isc_netaddr_t clientaddr;
+	isc_uint8_t *paddr;
+	int i;
+
+	REQUIRE(NS_CLIENT_VALID(client));
+	REQUIRE(rdbuf != NULL);
+	REQUIRE(optlen != NULL);
+	INSIST(isc_buffer_remaininglength(rdbuf) >= *optlen);
+
+	if (*optlen < 4) {
+		/* 2 octets for family, 1 octet for source netmask and
+		 * 1 octet for scope netmask */
+		ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+			      NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+			      "EDNS0 client subnet option is too short");
+		return DNS_R_FORMERR;
+	}
+
+	family = isc_buffer_getuint16(rdbuf);
+	addrlen = isc_buffer_getuint8(rdbuf);
+	scopelen = isc_buffer_getuint8(rdbuf);
+	*optlen -= 4;
+
+	if (scopelen != 0) {
+		ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+			      NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+			      "EDNS0 client subnet scope is not 0");
+		return DNS_R_FORMERR;
+	}
+
+	memset(&clientaddr, 0, sizeof(clientaddr));
+	switch (family) {
+	case 1:
+		/* IPv4 */
+		if (addrlen > 32) addrlen = 32;
+		clientaddr.family = AF_INET;
+		break;
+	case 2:
+		/* IPv6 */
+		if (addrlen > 128) addrlen = 128;
+		clientaddr.family = AF_INET6;
+		break;
+	default:
+		/* Dunno what to do, let's skip all. */
+		return DNS_R_FORMERR;
+	}
+
+	addrbytes = (addrlen + 7) / 8;
+	if (*optlen < addrbytes) {
+		ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+			      NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+			      "EDNS0 client subnet address is too short");
+		return DNS_R_FORMERR;
+	}
+	paddr = (isc_uint8_t*)&clientaddr.type;
+	for (i = 0; i < addrbytes; i++) {
+		paddr[i] = isc_buffer_getuint8(rdbuf);
+	}
+	*optlen -= i;
+
+	memcpy(&client->clientaddr, &clientaddr, sizeof(clientaddr));
+	client->clientaddrlen = addrlen;
+	client->clientscopelen = 0;
+	return ISC_R_SUCCESS;
+}
+
+/*
  * Handle an incoming request event from the socket (UDP case)
  * or tcpmsg (TCP case).
  */
@@ -1379,6 +1488,7 @@ client_request(isc_task_t *task, isc_event_t *event) {
 	isc_boolean_t notimp;
 	dns_rdata_t rdata;
 	isc_uint16_t optcode;
+	isc_uint16_t optlen;
 
 	REQUIRE(event != NULL);
 	client = event->ev_arg;
@@ -1577,6 +1687,7 @@ client_request(isc_task_t *task, isc_event_t *event) {
 	/*
 	 * Deal with EDNS.
 	 */
+	client->clientaddrlen = client->clientscopelen = 0;
 	opt = dns_message_getopt(client->message);
 	if (opt != NULL) {
 		/*
@@ -1612,20 +1723,43 @@ client_request(isc_task_t *task, isc_event_t *event) {
 			goto cleanup;
 		}
 
-		/* Check for NSID request */
-		result = dns_rdataset_first(opt);
-		if (result == ISC_R_SUCCESS) {
+		/* Check for EDNS0 options */
+		for (result = dns_rdataset_first(opt); result == ISC_R_SUCCESS;
+		     result = dns_rdataset_next(opt)) {
+			isc_buffer_t rdbuf;
 			dns_rdata_init(&rdata);
 			dns_rdataset_current(opt, &rdata);
-			if (rdata.length >= 2) {
-				isc_buffer_t nsidbuf;
-				isc_buffer_init(&nsidbuf,
-						rdata.data, rdata.length);
-				isc_buffer_add(&nsidbuf, rdata.length);
-				optcode = isc_buffer_getuint16(&nsidbuf);
-				if (optcode == DNS_OPT_NSID)
+			isc_buffer_init(&rdbuf,
+					rdata.data, rdata.length);
+			isc_buffer_add(&rdbuf, rdata.length);
+			while (isc_buffer_remaininglength(&rdbuf) >= 4) {
+				optcode = isc_buffer_getuint16(&rdbuf);
+				optlen = isc_buffer_getuint16(&rdbuf);
+				if (isc_buffer_remaininglength(&rdbuf) < optlen) {
+					ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+						      NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+						      "EDNS0 option is shorter than expected");
+					ns_client_error(client, DNS_R_FORMERR);
+					goto cleanup;
+				}
+				switch (optcode) {
+				case DNS_OPT_NSID:
 					client->attributes |=
 						NS_CLIENTATTR_WANTNSID;
+					break;
+				case DNS_OPT_CLIENT_SUBNET:
+					result = client_parse_clientsubnet(client,
+									   &rdbuf,
+									   &optlen);
+					if (result != ISC_R_SUCCESS) {
+						ns_client_error(client, result);
+						goto cleanup;
+					}
+					isc_stats_increment(ns_g_server->nsstats,
+							    dns_nsstatscounter_subnetclientin);
+					break;
+				}
+				isc__buffer_forward(&rdbuf, optlen);
 			}
 		}
 
@@ -1633,13 +1767,9 @@ client_request(isc_task_t *task, isc_event_t *event) {
 				    dns_nsstatscounter_edns0in);
 
 		/*
-		 * Create an OPT for our reply.
+		 * Request an OPT for our reply.
 		 */
-		result = client_addopt(client);
-		if (result != ISC_R_SUCCESS) {
-			ns_client_error(client, result);
-			goto cleanup;
-		}
+		client->attributes |= NS_CLIENTATTR_EDNS0;
 	}
 
 	if (client->message->rdclass == 0) {
@@ -1719,8 +1849,11 @@ client_request(isc_task_t *task, isc_event_t *event) {
 			if (sigresult == ISC_R_SUCCESS)
 				tsig = dns_tsigkey_identity(client->message->tsigkey);
 
-			if (allowed(&netaddr, tsig, view->matchclients) &&
-			    allowed(&client->destaddr, tsig,
+			if (allowed(&netaddr,
+				    client->clientaddrlen?&client->clientaddr:NULL,
+				    client->clientaddrlen?&client->clientscopelen:NULL,
+				    tsig, view->matchclients) &&
+			    allowed(&client->destaddr, NULL, NULL, tsig,
 				    view->matchdestinations) &&
 			    !((client->message->flags & DNS_MESSAGEFLAG_RD)
 			      == 0 && view->matchrecursiveonly))
@@ -1763,6 +1896,14 @@ client_request(isc_task_t *task, isc_event_t *event) {
 		      NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(5),
 		      "using view '%s'", view->name);
 
+	if (client->attributes | NS_CLIENTATTR_EDNS0) {
+		result = client_addopt(client);
+		if (result != ISC_R_SUCCESS) {
+			ns_client_error(client, result);
+			goto cleanup;
+		}
+	}
+
 	/*
 	 * Check for a signature.  We log bad signatures regardless of
 	 * whether they ultimately cause the request to be rejected or
@@ -2109,6 +2250,8 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
 	client->recursionquota = NULL;
 	client->interface = NULL;
 	client->peeraddr_valid = ISC_FALSE;
+	client->clientaddrlen = 0;
+	client->clientscopelen = 0;
 	ISC_EVENT_INIT(&client->ctlevent, sizeof(client->ctlevent), 0, NULL,
 		       NS_EVENT_CLIENTCONTROL, client_start, client, client,
 		       NULL, NULL);
diff --git a/bin/named/include/named/client.h b/bin/named/include/named/client.h
index 33f124d..5eceb2f 100644
--- a/bin/named/include/named/client.h
+++ b/bin/named/include/named/client.h
@@ -139,6 +139,9 @@ struct ns_client {
 	isc_sockaddr_t		peeraddr;
 	isc_boolean_t		peeraddr_valid;
 	isc_netaddr_t		destaddr;
+	isc_netaddr_t		clientaddr;
+	isc_uint8_t		clientaddrlen;
+	isc_uint8_t             clientscopelen;
 	struct in6_pktinfo	pktinfo;
 	isc_event_t		ctlevent;
 	/*%
@@ -172,6 +175,7 @@ struct ns_client {
 #define NS_CLIENTATTR_FILTER_AAAA	0x40 /*%< suppress AAAAs */
 #define NS_CLIENTATTR_FILTER_AAAA_RC	0x80 /*%< recursing for A against AAAA */
 #endif
+#define NS_CLIENTATTR_EDNS0             0x100 /*%< add an EDNS0 option block in response */
 
 extern unsigned int ns_client_requests;
 
diff --git a/bin/named/include/named/server.h b/bin/named/include/named/server.h
index 3c6426e..9491e37 100644
--- a/bin/named/include/named/server.h
+++ b/bin/named/include/named/server.h
@@ -126,46 +126,47 @@ enum {
 	dns_nsstatscounter_requestv4 = 0,
 	dns_nsstatscounter_requestv6 = 1,
 	dns_nsstatscounter_edns0in = 2,
-	dns_nsstatscounter_badednsver = 3,
-	dns_nsstatscounter_tsigin = 4,
-	dns_nsstatscounter_sig0in = 5,
-	dns_nsstatscounter_invalidsig = 6,
-	dns_nsstatscounter_tcp = 7,
-
-	dns_nsstatscounter_authrej = 8,
-	dns_nsstatscounter_recurserej = 9,
-	dns_nsstatscounter_xfrrej = 10,
-	dns_nsstatscounter_updaterej = 11,
-
-	dns_nsstatscounter_response = 12,
-	dns_nsstatscounter_truncatedresp = 13,
-	dns_nsstatscounter_edns0out = 14,
-	dns_nsstatscounter_tsigout = 15,
-	dns_nsstatscounter_sig0out = 16,
-
-	dns_nsstatscounter_success = 17,
-	dns_nsstatscounter_authans = 18,
-	dns_nsstatscounter_nonauthans = 19,
-	dns_nsstatscounter_referral = 20,
-	dns_nsstatscounter_nxrrset = 21,
-	dns_nsstatscounter_servfail = 22,
-	dns_nsstatscounter_formerr = 23,
-	dns_nsstatscounter_nxdomain = 24,
-	dns_nsstatscounter_recursion = 25,
-	dns_nsstatscounter_duplicate = 26,
-	dns_nsstatscounter_dropped = 27,
-	dns_nsstatscounter_failure = 28,
-
-	dns_nsstatscounter_xfrdone = 29,
-
-	dns_nsstatscounter_updatereqfwd = 30,
-	dns_nsstatscounter_updaterespfwd = 31,
-	dns_nsstatscounter_updatefwdfail = 32,
-	dns_nsstatscounter_updatedone = 33,
-	dns_nsstatscounter_updatefail = 34,
-	dns_nsstatscounter_updatebadprereq = 35,
-
-	dns_nsstatscounter_max = 36
+	dns_nsstatscounter_subnetclientin = 3,
+	dns_nsstatscounter_badednsver = 4,
+	dns_nsstatscounter_tsigin = 5,
+	dns_nsstatscounter_sig0in = 6,
+	dns_nsstatscounter_invalidsig = 7,
+	dns_nsstatscounter_tcp = 8,
+
+	dns_nsstatscounter_authrej = 9,
+	dns_nsstatscounter_recurserej = 10,
+	dns_nsstatscounter_xfrrej = 11,
+	dns_nsstatscounter_updaterej = 12,
+
+	dns_nsstatscounter_response = 13,
+	dns_nsstatscounter_truncatedresp = 14,
+	dns_nsstatscounter_edns0out = 15,
+	dns_nsstatscounter_tsigout = 16,
+	dns_nsstatscounter_sig0out = 17,
+
+	dns_nsstatscounter_success = 18,
+	dns_nsstatscounter_authans = 19,
+	dns_nsstatscounter_nonauthans = 20,
+	dns_nsstatscounter_referral = 21,
+	dns_nsstatscounter_nxrrset = 22,
+	dns_nsstatscounter_servfail = 23,
+	dns_nsstatscounter_formerr = 24,
+	dns_nsstatscounter_nxdomain = 25,
+	dns_nsstatscounter_recursion = 26,
+	dns_nsstatscounter_duplicate = 27,
+	dns_nsstatscounter_dropped = 28,
+	dns_nsstatscounter_failure = 29,
+
+	dns_nsstatscounter_xfrdone = 30,
+
+	dns_nsstatscounter_updatereqfwd = 31,
+	dns_nsstatscounter_updaterespfwd = 32,
+	dns_nsstatscounter_updatefwdfail = 33,
+	dns_nsstatscounter_updatedone = 34,
+	dns_nsstatscounter_updatefail = 35,
+	dns_nsstatscounter_updatebadprereq = 36,
+
+	dns_nsstatscounter_max = 37
 };
 
 void
diff --git a/bin/named/sortlist.c b/bin/named/sortlist.c
index 0710fb1..37af55c 100644
--- a/bin/named/sortlist.c
+++ b/bin/named/sortlist.c
@@ -72,7 +72,7 @@ ns_sortlist_setup(dns_acl_t *acl, isc_netaddr_t *clientaddr,
 			try_elt = e;
 		}
 
-		if (dns_aclelement_match(clientaddr, NULL, try_elt,
+		if (dns_aclelement_match(clientaddr, NULL, NULL, NULL, try_elt,
 					 &ns_g_server->aclenv,
 					 &matched_elt)) {
 			if (order_elt != NULL) {
@@ -132,7 +132,7 @@ ns_sortlist_addrorder2(const isc_netaddr_t *addr, const void *arg) {
 int
 ns_sortlist_addrorder1(const isc_netaddr_t *addr, const void *arg) {
 	const dns_aclelement_t *matchelt = (const dns_aclelement_t *) arg;
-	if (dns_aclelement_match(addr, NULL, matchelt,
+	if (dns_aclelement_match(addr, NULL, NULL, NULL, matchelt,
 				 &ns_g_server->aclenv,
 				 NULL)) {
 		return (0);
diff --git a/bin/named/statschannel.c b/bin/named/statschannel.c
index 1f72694..110dff4 100644
--- a/bin/named/statschannel.c
+++ b/bin/named/statschannel.c
@@ -152,6 +152,8 @@ init_desc(void) {
 	SET_NSSTATDESC(requestv4, "IPv4 requests received", "Requestv4");
 	SET_NSSTATDESC(requestv6, "IPv6 requests received", "Requestv6");
 	SET_NSSTATDESC(edns0in, "requests with EDNS(0) received", "ReqEdns0");
+	SET_NSSTATDESC(subnetclientin, "requests with EDNS(0) subnet client received",
+		       "ReqEdns0SubnetClient");
 	SET_NSSTATDESC(badednsver,
 		       "requests with unsupported EDNS version received",
 		       "ReqBadEDNSVer");
diff --git a/lib/dns/acl.c b/lib/dns/acl.c
index 2f272e2..44ac41e 100644
--- a/lib/dns/acl.c
+++ b/lib/dns/acl.c
@@ -249,12 +249,14 @@ dns_acl_isnone(dns_acl_t *acl)
  * element or radix entry, return with a negative value in match.
  */
 isc_result_t
-dns_acl_match(const isc_netaddr_t *reqaddr,
-	      const dns_name_t *reqsigner,
-	      const dns_acl_t *acl,
-	      const dns_aclenv_t *env,
-	      int *match,
-	      const dns_aclelement_t **matchelt)
+dns_acl_match_with_client(const isc_netaddr_t *reqaddr,
+			  const isc_netaddr_t *clientaddr,
+			  isc_uint8_t *scope,
+			  const dns_name_t *reqsigner,
+			  const dns_acl_t *acl,
+			  const dns_aclenv_t *env,
+			  int *match,
+			  const dns_aclelement_t **matchelt)
 {
 	isc_uint16_t bitlen, family;
 	isc_prefix_t pfx;
@@ -307,7 +309,7 @@ dns_acl_match(const isc_netaddr_t *reqaddr,
 			return (ISC_R_SUCCESS);
 		}
 
-		if (dns_aclelement_match(reqaddr, reqsigner,
+		if (dns_aclelement_match(reqaddr, clientaddr, scope, reqsigner,
 					 e, env, matchelt)) {
 			if (match_num == -1 || e->node_num < match_num) {
 				if (e->negative == ISC_TRUE)
@@ -324,6 +326,18 @@ dns_acl_match(const isc_netaddr_t *reqaddr,
 	return (ISC_R_SUCCESS);
 }
 
+isc_result_t
+dns_acl_match(const isc_netaddr_t *reqaddr,
+	      const dns_name_t *reqsigner,
+	      const dns_acl_t *acl,
+	      const dns_aclenv_t *env,
+	      int *match,
+	      const dns_aclelement_t **matchelt)
+{
+	return dns_acl_match_with_client(reqaddr, NULL, NULL, reqsigner, acl,
+					 env, match, matchelt);
+}
+
 /*
  * Merge the contents of one ACL into another.  Call dns_iptable_merge()
  * for the IP tables, then concatenate the element arrays.
@@ -433,6 +447,8 @@ dns_acl_merge(dns_acl_t *dest, dns_acl_t *source, isc_boolean_t pos)
  */
 isc_boolean_t
 dns_aclelement_match(const isc_netaddr_t *reqaddr,
+		     const isc_netaddr_t *clientaddr,
+		     isc_uint8_t *scope,
 		     const dns_name_t *reqsigner,
 		     const dns_aclelement_t *e,
 		     const dns_aclenv_t *env,
@@ -442,6 +458,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 	int indirectmatch;
 	isc_result_t result;
 #ifdef HAVE_GEOIP
+	const isc_netaddr_t *geoaddr = clientaddr?clientaddr:reqaddr;
+	GeoIPLookup gl;
 	uint32_t ipnum = 0;
 #ifdef HAVE_GEOIP_V6
 	const geoipv6_t *ipnum6 = NULL;
@@ -455,18 +473,18 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 #endif
 #endif /* HAVE_GEOIP_V6 */
 
-	switch ( reqaddr->family ) {
+	switch ( geoaddr->family ) {
 	case AF_INET:
-		ipnum = ntohl(reqaddr->type.in.s_addr);
+		ipnum = ntohl(geoaddr->type.in.s_addr);
 #ifdef DEBUG_GEOIP
-		inet_ntop(AF_INET, &reqaddr->type.in, ipstr, INET_ADDRSTRLEN);
+		inet_ntop(AF_INET, &geoaddr->type.in, ipstr, INET_ADDRSTRLEN);
 #endif
 		break;
 #ifdef HAVE_GEOIP_V6
 	case AF_INET6:
-		ipnum6 = &reqaddr->type.in6;
+		ipnum6 = &geoaddr->type.in6;
 #ifdef DEBUG_GEOIP
-		inet_ntop(AF_INET6, &reqaddr->type.in6, ipstr, INET6_ADDRSTRLEN);
+		inet_ntop(AF_INET6, &geoaddr->type.in6, ipstr, INET6_ADDRSTRLEN);
 #endif
 		break;
 #endif
@@ -521,10 +539,10 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		switch ( e->geoip_countryDB.subtype ) {
 		case geoip_countryDB_country_code:
 			if ( ipnum )
-				result = GeoIP_country_code_by_ipnum( ns_g_geoip_countryDB, ipnum );
+				result = GeoIP_country_code_by_ipnum_gl( ns_g_geoip_countryDB, ipnum, &gl );
 #ifdef HAVE_GEOIP_V6
 			else if ( ipnum6 )
-				result = GeoIP_country_code_by_ipnum_v6( ns_g_geoip_countryDB_v6, *ipnum6 );
+				result = GeoIP_country_code_by_ipnum_v6_gl( ns_g_geoip_countryDB_v6, *ipnum6, &gl );
 #endif
 			if ( result )
 				georesult = ( strncasecmp( e->geoip_countryDB.country_code, result, 2 ) == 0 );
@@ -539,10 +557,10 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 			break;
 		case geoip_countryDB_country_code3:
 			if ( ipnum )
-				result = GeoIP_country_code3_by_ipnum( ns_g_geoip_countryDB, ipnum );
+				result = GeoIP_country_code3_by_ipnum_gl( ns_g_geoip_countryDB, ipnum, &gl );
 #ifdef HAVE_GEOIP_V6
 			else if ( ipnum6 )
-				result = GeoIP_country_code3_by_ipnum_v6( ns_g_geoip_countryDB_v6, *ipnum6 );
+				result = GeoIP_country_code3_by_ipnum_v6_gl( ns_g_geoip_countryDB_v6, *ipnum6, &gl );
 #endif
 			if ( result )
 				georesult = ( strncasecmp( e->geoip_countryDB.country_code3, result, 3 ) == 0 );
@@ -557,10 +575,10 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 			break;
 		case geoip_countryDB_country_name:
 			if ( ipnum )
-				result = GeoIP_country_name_by_ipnum( ns_g_geoip_countryDB, ipnum );
+				result = GeoIP_country_name_by_ipnum_gl( ns_g_geoip_countryDB, ipnum, &gl );
 #ifdef HAVE_GEOIP_V6
 			else if ( ipnum6 )
-				result = GeoIP_country_name_by_ipnum_v6( ns_g_geoip_countryDB_v6, *ipnum6 );
+				result = GeoIP_country_name_by_ipnum_v6_gl( ns_g_geoip_countryDB_v6, *ipnum6, &gl );
 #endif
 			if ( result )
 				georesult = ( strcasecmp( e->geoip_countryDB.country_name, result ) == 0 );
@@ -576,6 +594,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		default:
 			break;
 		} /* switch */
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_countryDB */
 
@@ -783,6 +803,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 				"client %s: geoip_cityDB found no record",
 				ipstr);
 #endif
+		if (georesult && record && scope && *scope == 0)
+			*scope = record->netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_cityDB */
 
@@ -793,7 +815,7 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		if ( !ipnum || !ns_g_geoip_regionDB )
 			return(ISC_FALSE);
 
-		if (( record = GeoIP_region_by_ipnum( ns_g_geoip_regionDB, ipnum) )) {
+		if (( record = GeoIP_region_by_ipnum_gl( ns_g_geoip_regionDB, ipnum, &gl ) )) {
 			switch ( e->geoip_regionDB.subtype ) {
 			case geoip_regionDB_country_code:
 				if ( record->country_code )
@@ -830,6 +852,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 				"client %s: geoip_regionDB found no record",
 				ipstr);
 #endif
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_regionDB */
 
@@ -842,7 +866,7 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 
 		switch ( e->geoip_ispDB.subtype ) {
 		case geoip_ispDB_name:
-			if (( result = GeoIP_name_by_ipnum( ns_g_geoip_ispDB, ipnum ) ))
+			if (( result = GeoIP_name_by_ipnum_gl( ns_g_geoip_ispDB, ipnum, &gl ) ))
 				georesult = ( strcasecmp( e->geoip_ispDB.name, result ) == 0 );
 #ifdef DEBUG_GEOIP
 			isc_log_write(dns_lctx, DNS_LOGCATEGORY_NOTIFY,
@@ -856,6 +880,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		default:
 			break;
 		} /* switch */
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_ispDB */
 
@@ -868,7 +894,7 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 
 		switch ( e->geoip_orgDB.subtype ) {
 		case geoip_orgDB_name:
-			if (( result = GeoIP_name_by_ipnum( ns_g_geoip_orgDB, ipnum ) ))
+			if (( result = GeoIP_name_by_ipnum_gl( ns_g_geoip_orgDB, ipnum, &gl ) ))
 				georesult = ( strcasecmp( e->geoip_orgDB.name, result ) == 0 );
 #ifdef DEBUG_GEOIP
 			isc_log_write(dns_lctx, DNS_LOGCATEGORY_NOTIFY,
@@ -882,6 +908,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		default:
 			break;
 		} /* switch */
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_orgDB */
 
@@ -894,7 +922,7 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 
 		switch ( e->geoip_asDB.subtype ) {
 		case geoip_asDB_org:
-			if (( result = GeoIP_org_by_ipnum( ns_g_geoip_asDB, ipnum ) ))
+			if (( result = GeoIP_name_by_ipnum_gl( ns_g_geoip_asDB, ipnum, &gl ) ))
 				georesult = ( strcasecmp( e->geoip_asDB.org, result ) == 0 );
 #ifdef DEBUG_GEOIP
 			isc_log_write(dns_lctx, DNS_LOGCATEGORY_NOTIFY,
@@ -908,6 +936,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		default:
 			break;
 		} /* switch */
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_asDB */
 
@@ -920,7 +950,7 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 
 		switch ( e->geoip_netspeedDB.subtype ) {
 		case geoip_netspeedDB_id:
-			result = GeoIP_id_by_ipnum( ns_g_geoip_netspeedDB, ipnum );
+			result = GeoIP_id_by_ipnum_gl( ns_g_geoip_netspeedDB, ipnum, &gl );
 			georesult = ( e->geoip_netspeedDB.id == result );
 #ifdef DEBUG_GEOIP
 			isc_log_write(dns_lctx, DNS_LOGCATEGORY_NOTIFY,
@@ -934,6 +964,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		default:
 			break;
 		} /* switch */
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_netspeedDB */
 
@@ -946,7 +978,7 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 
 		switch ( e->geoip_domainDB.subtype ) {
 		case geoip_domainDB_name:
-			if (( result = GeoIP_name_by_ipnum( ns_g_geoip_domainDB, ipnum ) ))
+			if (( result = GeoIP_name_by_ipnum_gl( ns_g_geoip_domainDB, ipnum, &gl ) ))
 				georesult = ( strcasecmp( e->geoip_domainDB.name, result ) == 0 );
 #ifdef DEBUG_GEOIP
 			isc_log_write(dns_lctx, DNS_LOGCATEGORY_NOTIFY,
@@ -960,6 +992,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		default:
 			break;
 		} /* switch */
+		if (georesult && scope && *scope == 0)
+			*scope = gl.netmask;
 		return( georesult ? ISC_TRUE : ISC_FALSE );
 	} /* case geoip_domainDB */
 
@@ -982,8 +1016,8 @@ dns_aclelement_match(const isc_netaddr_t *reqaddr,
 		INSIST(0);
 	}
 
-	result = dns_acl_match(reqaddr, reqsigner, inner, env,
-			       &indirectmatch, matchelt);
+	result = dns_acl_match_with_client(reqaddr, clientaddr, scope, reqsigner, inner, env,
+					   &indirectmatch, matchelt);
 	INSIST(result == ISC_R_SUCCESS);
 
 	/*
diff --git a/lib/dns/include/dns/acl.h b/lib/dns/include/dns/acl.h
index 26c6912..0d6423e 100644
--- a/lib/dns/include/dns/acl.h
+++ b/lib/dns/include/dns/acl.h
@@ -359,8 +359,26 @@ dns_acl_match(const isc_netaddr_t *reqaddr,
  *\li	#ISC_R_SUCCESS		Always succeeds.
  */
 
+isc_result_t
+dns_acl_match_with_client(const isc_netaddr_t *reqaddr,
+			  const isc_netaddr_t *clientaddr,
+			  isc_uint8_t *scope,
+			  const dns_name_t *reqsigner,
+			  const dns_acl_t *acl,
+			  const dns_aclenv_t *env,
+			  int *match,
+			  const dns_aclelement_t **matchelt);
+/*%<
+ * Similar to dns_acl_match but should be provided with the IP
+ * address of the client (through EDNS0 client subnet extension) in
+ * addition to the IP address of the requester. This IP address will be
+ * used to match GeoIP.
+ */
+
 isc_boolean_t
 dns_aclelement_match(const isc_netaddr_t *reqaddr,
+		     const isc_netaddr_t *clientaddr,
+		     isc_uint8_t *scope,
 		     const dns_name_t *reqsigner,
 		     const dns_aclelement_t *e,
 		     const dns_aclenv_t *env,
-- 
1.8.4.rc3

Thanks Vincent,

I successfully installed the bind,and tried with the dig but it seems it doesn't provide the expected results.

[root@ns3 bin]# ./dig @dns-02.dailymotion.com www.dailymotion.com +client=170.149.100.0/24
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 170.149.100.0/24/22
;; QUESTION SECTION:

[root@ns3 bin]# ./dig @127.0.0.1 www.dailymotion.com +client=170.149.100.0/24

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.dailymotion.com. IN A

Hi Vincent,

Please help me here as i am struggling with this from long time and didn't find the way to solve it.

Thanks,
Punit