networkd: dhcp add vendor class indentifier option 60

Vendor Class Identifier be used by DHCP clients to identify
their vendor type and configuration. When using this option,
vendors can define their own specific identifier values, such
as to convey a particular hardware or operating system
configuration or other identifying information.

Vendor-specified DHCP options—features that let administrators assign
separate options to clients with similar configuration requirements.
For example, if DHCP-aware clients for example we want to separate
different gateway and option for different set of people
(dev/test/hr/finance) in a org or devices for example web/database
servers or let's say in a embedded device etc and require a different
default gateway or DNS server than the rest of clients.

7 files changed, 41 insertions, 0 deletions

diff --git a/src/libsystemd-network/dhcp-protocol.h b/src/libsystemd-network/dhcp-protocol.h
index 8cbd98e4ec..7c06b5ab68 100644
--- a/src/libsystemd-network/dhcp-protocol.h
+++ b/src/libsystemd-network/dhcp-protocol.h
@@ -131,6 +131,7 @@ enum {
         DHCP_OPTION_MAXIMUM_MESSAGE_SIZE        = 57,
         DHCP_OPTION_RENEWAL_T1_TIME             = 58,
         DHCP_OPTION_REBINDING_T2_TIME           = 59,
+        DHCP_OPTION_VENDOR_CLASS_IDENTIFIER     = 60,
         DHCP_OPTION_CLIENT_IDENTIFIER           = 61,
         DHCP_OPTION_CLASSLESS_STATIC_ROUTE      = 121,
         DHCP_OPTION_END                         = 255,
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 6b19666c3b..3c389931cd 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -57,6 +57,7 @@ struct sd_dhcp_client {
                 struct ether_addr mac_addr;
         } _packed_ client_id;
         char *hostname;
+        char *vendor_class_identifier;
         uint32_t xid;
         usec_t start_time;
         uint16_t secs;
@@ -200,6 +201,23 @@ int sd_dhcp_client_set_hostname(sd_dhcp_client *client,
         return 0;
 }
 
+int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client,
+                                               const char *vci) {
+        char *new_vci = NULL;
+
+        assert_return(client, -EINVAL);
+
+        new_vci = strdup(vci);
+        if (!new_vci)
+                return -ENOMEM;
+
+        free(client->vendor_class_identifier);
+
+        client->vendor_class_identifier = new_vci;
+
+        return 0;
+}
+
 int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
         assert_return(client, -EINVAL);
         assert_return(ret, -EINVAL);
@@ -419,6 +437,15 @@ static int client_send_discover(sd_dhcp_client *client) {
                         return r;
         }
 
+        if (client->vendor_class_identifier) {
+                r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+                                       DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
+                                       strlen(client->vendor_class_identifier),
+                                       client->vendor_class_identifier);
+                if (r < 0)
+                        return r;
+        }
+
         r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
                                DHCP_OPTION_END, 0, NULL);
         if (r < 0)
@@ -1406,6 +1433,7 @@ sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) {
 
                 free(client->req_opts);
                 free(client->hostname);
+                free(client->vendor_class_identifier);
                 free(client);
         }
 
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 5f6c22a611..9e057ce0ff 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -2023,6 +2023,13 @@ static int link_configure(Link *link) {
                                         return r;
                         }
                 }
+
+                if (link->network->dhcp_vendor_class_identifier) {
+                        r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
+                                                                       link->network->dhcp_vendor_class_identifier);
+                        if (r < 0)
+                                return r;
+                }
         }
 
         if (link->network->dhcp_server) {
diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index 50cb0f8be9..5c1c013373 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -51,6 +51,7 @@ DHCP.UseDomainName,          config_parse_bool,                  0,
 DHCP.UseRoutes,              config_parse_bool,                  0,                             offsetof(Network, dhcp_routes)
 DHCP.SendHostname,           config_parse_bool,                  0,                             offsetof(Network, dhcp_sendhost)
 DHCP.CriticalConnection,     config_parse_bool,                  0,                             offsetof(Network, dhcp_critical)
+DHCP.VendorClassIdentifier,  config_parse_string,                0,                             offsetof(Network, dhcp_vendor_class_identifier)
 /* backwards compatibility: do not add new entries to this section */
 DHCPv4.UseDNS,               config_parse_bool,                  0,                             offsetof(Network, dhcp_dns)
 DHCPv4.UseMTU,               config_parse_bool,                  0,                             offsetof(Network, dhcp_mtu)
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index 9f6de18538..c108ad2358 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -166,6 +166,7 @@ void network_free(Network *network) {
         free(network->match_name);
 
         free(network->description);
+        free(network->dhcp_vendor_class_identifier);
 
         while ((address = network->ntp)) {
                 LIST_REMOVE(addresses, network->ntp, address);
diff --git a/src/network/networkd.h b/src/network/networkd.h
index aca3b8dd24..0f0ecd5c43 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -175,6 +175,8 @@ struct Network {
         char *match_driver;
         char *match_type;
         char *match_name;
+        char *dhcp_vendor_class_identifier;
+
         Condition *match_host;
         Condition *match_virt;
         Condition *match_kernel;
diff --git a/src/systemd/sd-dhcp-client.h b/src/systemd/sd-dhcp-client.h
index c3ea0592f6..9ab6105e5b 100644
--- a/src/systemd/sd-dhcp-client.h
+++ b/src/systemd/sd-dhcp-client.h
@@ -52,6 +52,7 @@ int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index);
 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
                            const struct ether_addr *addr);
 int sd_dhcp_client_set_hostname(sd_dhcp_client *client, const char *hostname);
+int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client, const char *vci);
 int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret);
 
 int sd_dhcp_client_stop(sd_dhcp_client *client);