From 7c3de8f8cff2220dca2a27a8e85e40641a6ae9c4 Mon Sep 17 00:00:00 2001
From: Patrik Flykt <patrik.flykt@linux.intel.com>
Date: Thu, 4 Jan 2018 15:11:50 +0200
Subject: [PATCH] dhcp6: Add functionality to request DHCPv6 IA PD

Add a function to request IA Prefix Delegation when the DHCPv6
client is started and PD options to DHCPv6 messages.
---
 src/libsystemd-network/sd-dhcp6-client.c | 36 ++++++++++++++++++++++++
 src/systemd/sd-dhcp6-client.h            |  3 ++
 2 files changed, 39 insertions(+)

diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c
index 9586da65034..2c2d062ede5 100644
--- a/src/libsystemd-network/sd-dhcp6-client.c
+++ b/src/libsystemd-network/sd-dhcp6-client.c
@@ -55,6 +55,7 @@ struct sd_dhcp6_client {
         uint16_t arp_type;
         DHCP6IA ia_na;
         DHCP6IA ia_pd;
+        bool prefix_delegation;
         be32_t transaction_id;
         usec_t transaction_start;
         struct sd_dhcp6_lease *lease;
@@ -300,6 +301,14 @@ int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option)
         return 0;
 }
 
+int sd_dhcp6_client_set_prefix_delegation(sd_dhcp6_client *client, bool delegation) {
+        assert_return(client, -EINVAL);
+
+        client->prefix_delegation = delegation;
+
+        return 0;
+}
+
 int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) {
         assert_return(client, -EINVAL);
 
@@ -413,6 +422,15 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
                                 return r;
                 }
 
+                if (client->prefix_delegation) {
+                        r = dhcp6_option_append_pd(opt, optlen, &client->ia_pd);
+                        if (r < 0)
+                                return r;
+
+                        opt += r;
+                        optlen -= r;
+                }
+
                 break;
 
         case DHCP6_STATE_REQUEST:
@@ -439,6 +457,15 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
                                 return r;
                 }
 
+                if (client->prefix_delegation) {
+                        r = dhcp6_option_append_pd(opt, optlen, &client->lease->pd);
+                        if (r < 0)
+                                return r;
+
+                        opt += r;
+                        optlen -= r;
+                }
+
                 break;
 
         case DHCP6_STATE_REBIND:
@@ -454,6 +481,15 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
                                 return r;
                 }
 
+                if (client->prefix_delegation) {
+                        r = dhcp6_option_append_pd(opt, optlen, &client->lease->pd);
+                        if (r < 0)
+                                return r;
+
+                        opt += r;
+                        optlen -= r;
+                }
+
                 break;
 
         case DHCP6_STATE_STOPPED:
diff --git a/src/systemd/sd-dhcp6-client.h b/src/systemd/sd-dhcp6-client.h
index 2741b54eb08..cadb32a0513 100644
--- a/src/systemd/sd-dhcp6-client.h
+++ b/src/systemd/sd-dhcp6-client.h
@@ -23,6 +23,7 @@
 
 #include <inttypes.h>
 #include <net/ethernet.h>
+#include <stdbool.h>
 #include <sys/types.h>
 
 #include "sd-dhcp6-lease.h"
@@ -118,6 +119,8 @@ int sd_dhcp6_client_get_information_request(
 int sd_dhcp6_client_set_request_option(
                 sd_dhcp6_client *client,
                 uint16_t option);
+int sd_dhcp6_client_set_prefix_delegation(sd_dhcp6_client *client,
+                                          bool delegation);
 
 int sd_dhcp6_client_get_lease(
                 sd_dhcp6_client *client,