[ovs-dev,v2] Add support for DHCP option 15 - domain name

diff --git a/ovn/lib/ovn-l7.h b/ovn/lib/ovn-l7.h
index c24201ef0..362f537da 100644
--- a/ovn/lib/ovn-l7.h
+++ b/ovn/lib/ovn-l7.h
@@ -40,6 +40,7 @@  struct gen_opts_map {
 #define DHCP_OPT_DNS_SERVER  DHCP_OPTION("dns_server", 6, "ipv4")
 #define DHCP_OPT_LOG_SERVER  DHCP_OPTION("log_server", 7, "ipv4")
 #define DHCP_OPT_LPR_SERVER  DHCP_OPTION("lpr_server", 9, "ipv4")
+#define DHCP_OPT_DOMAIN_NAME DHCP_OPTION("domain_name", 15, "str")
 #define DHCP_OPT_SWAP_SERVER DHCP_OPTION("swap_server", 16, "ipv4")
 
 #define DHCP_OPT_POLICY_FILTER \
diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c
index de0c06d4b..0b0a96a3a 100644
--- a/ovn/northd/ovn-northd.c
+++ b/ovn/northd/ovn-northd.c
@@ -8226,6 +8226,7 @@  static struct gen_opts_map supported_dhcp_opts[] = {
     DHCP_OPT_BOOTFILE,
     DHCP_OPT_PATH_PREFIX,
     DHCP_OPT_TFTP_SERVER_ADDRESS,
+    DHCP_OPT_DOMAIN_NAME,
 };
 
 static struct gen_opts_map supported_dhcpv6_opts[] = {
diff --git a/ovn/ovn-nb.xml b/ovn/ovn-nb.xml
index cbaa9495f..318379c1f 100644
--- a/ovn/ovn-nb.xml
+++ b/ovn/ovn-nb.xml
@@ -2355,6 +2355,14 @@ 
             that matches with this requirement is option 66 (tftp_server).
           </p>
         </column>
+
+        <column name="options" key="domain_name">
+          <p>
+            The DHCPv4 option code for this option is 15. This option
+            specifies the domain name that client should use when
+            resolving hostnames via the Domain Name System.
+          </p>
+        </column>
       </group>
     </group>
 
diff --git a/tests/oss-fuzz/expr_parse_target.c b/tests/oss-fuzz/expr_parse_target.c
index 7416421b8..170186d9d 100644
--- a/tests/oss-fuzz/expr_parse_target.c
+++ b/tests/oss-fuzz/expr_parse_target.c
@@ -122,7 +122,7 @@  create_gen_opts(struct hmap *dhcp_opts, struct hmap *dhcpv6_opts,
     dhcp_opt_add(dhcp_opts, "dns_server", 6, "ipv4");
     dhcp_opt_add(dhcp_opts, "log_server", 7, "ipv4");
     dhcp_opt_add(dhcp_opts, "lpr_server",  9, "ipv4");
-    dhcp_opt_add(dhcp_opts, "domain", 15, "str");
+    dhcp_opt_add(dhcp_opts, "domain_name", 15, "str");
     dhcp_opt_add(dhcp_opts, "swap_server", 16, "ipv4");
     dhcp_opt_add(dhcp_opts, "policy_filter", 21, "ipv4");
     dhcp_opt_add(dhcp_opts, "router_solicitation",  32, "ipv4");
diff --git a/tests/ovn.at b/tests/ovn.at
index 1231f4106..daf85a55d 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -1104,8 +1104,8 @@  put_arp(inport, arp.spa, arp.sha);
 # put_dhcp_opts
 reg1[0] = put_dhcp_opts(offerip = 1.2.3.4, router = 10.0.0.1);
     encodes as controller(userdata=00.00.00.02.00.00.00.00.00.01.de.10.00.00.00.40.01.02.03.04.03.04.0a.00.00.01,pause)
-reg2[5] = put_dhcp_opts(offerip=10.0.0.4,router=10.0.0.1,netmask=255.255.254.0,mtu=1400,domain="ovn.org",wpad="https://example.org",bootfile_name="https://127.0.0.1/boot.ipxe",path_prefix="/tftpboot");
-    formats as reg2[5] = put_dhcp_opts(offerip = 10.0.0.4, router = 10.0.0.1, netmask = 255.255.254.0, mtu = 1400, domain = "ovn.org", wpad = "https://example.org", bootfile_name = "https://127.0.0.1/boot.ipxe", path_prefix = "/tftpboot");
+reg2[5] = put_dhcp_opts(offerip=10.0.0.4,router=10.0.0.1,netmask=255.255.254.0,mtu=1400,domain_name="ovn.org",wpad="https://example.org",bootfile_name="https://127.0.0.1/boot.ipxe",path_prefix="/tftpboot");
+    formats as reg2[5] = put_dhcp_opts(offerip = 10.0.0.4, router = 10.0.0.1, netmask = 255.255.254.0, mtu = 1400, domain_name = "ovn.org", wpad = "https://example.org", bootfile_name = "https://127.0.0.1/boot.ipxe", path_prefix = "/tftpboot");
     encodes as controller(userdata=00.00.00.02.00.00.00.00.00.01.de.10.00.00.00.25.0a.00.00.04.03.04.0a.00.00.01.01.04.ff.ff.fe.00.1a.02.05.78.0f.07.6f.76.6e.2e.6f.72.67.fc.13.68.74.74.70.73.3a.2f.2f.65.78.61.6d.70.6c.65.2e.6f.72.67.43.1b.68.74.74.70.73.3a.2f.2f.31.32.37.2e.30.2e.30.2e.31.2f.62.6f.6f.74.2e.69.70.78.65.d2.09.2f.74.66.74.70.62.6f.6f.74,pause)
 reg0[15] = put_dhcp_opts(offerip=10.0.0.4,router=10.0.0.1,netmask=255.255.255.0,mtu=1400,ip_forward_enable=1,default_ttl=121,dns_server={8.8.8.8,7.7.7.7},classless_static_route={30.0.0.0/24,10.0.0.4,40.0.0.0/16,10.0.0.6,0.0.0.0/0,10.0.0.1},ethernet_encap=1,router_discovery=0,tftp_server_address={10.0.0.4,10.0.0.5});
     formats as reg0[15] = put_dhcp_opts(offerip = 10.0.0.4, router = 10.0.0.1, netmask = 255.255.255.0, mtu = 1400, ip_forward_enable = 1, default_ttl = 121, dns_server = {8.8.8.8, 7.7.7.7}, classless_static_route = {30.0.0.0/24, 10.0.0.4, 40.0.0.0/16, 10.0.0.6, 0.0.0.0/0, 10.0.0.1}, ethernet_encap = 1, router_discovery = 0, tftp_server_address = {10.0.0.4, 10.0.0.5});
@@ -1125,8 +1125,8 @@  reg1[0] = put_dhcp_opts(offerip=1.2.3.4, xyzzy);
     Syntax error at `xyzzy' expecting DHCPv4 option name.
 reg1[0] = put_dhcp_opts(offerip="xyzzy");
     DHCPv4 option offerip requires numeric value.
-reg1[0] = put_dhcp_opts(offerip=1.2.3.4, domain=1.2.3.4);
-    DHCPv4 option domain requires string value.
+reg1[0] = put_dhcp_opts(offerip=1.2.3.4, domain_name=1.2.3.4);
+    DHCPv4 option domain_name requires string value.
 
 # nd_ns
 nd_ns { nd.target = xxreg0; output; };
diff --git a/tests/test-ovn.c b/tests/test-ovn.c
index 450cb9db5..27e65266d 100644
--- a/tests/test-ovn.c
+++ b/tests/test-ovn.c
@@ -166,7 +166,7 @@  create_gen_opts(struct hmap *dhcp_opts, struct hmap *dhcpv6_opts,
     dhcp_opt_add(dhcp_opts, "dns_server", 6, "ipv4");
     dhcp_opt_add(dhcp_opts, "log_server", 7, "ipv4");
     dhcp_opt_add(dhcp_opts, "lpr_server",  9, "ipv4");
-    dhcp_opt_add(dhcp_opts, "domain", 15, "str");
+    dhcp_opt_add(dhcp_opts, "domain_name", 15, "str");
     dhcp_opt_add(dhcp_opts, "swap_server", 16, "ipv4");
     dhcp_opt_add(dhcp_opts, "policy_filter", 21, "ipv4");
     dhcp_opt_add(dhcp_opts, "router_solicitation",  32, "ipv4");