1 files changed, 78 insertions, 0 deletions
diff --git a/src/libsystemd-network/dhcp6-network.c b/src/libsystemd-network/dhcp6-network.c
new file mode 100644
index 0000000..a3e4e19
--- /dev/null
+++ b/src/libsystemd-network/dhcp6-network.c
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+  Copyright © 2014 Intel Corporation. All rights reserved.
+***/
+
+#include <errno.h>
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <linux/if_packet.h>
+
+#include "dhcp6-internal.h"
+#include "dhcp6-protocol.h"
+#include "fd-util.h"
+#include "socket-util.h"
+
+int dhcp6_network_bind_udp_socket(int ifindex, struct in6_addr *local_address) {
+        union sockaddr_union src = {
+                .in6.sin6_family = AF_INET6,
+                .in6.sin6_port = htobe16(DHCP6_PORT_CLIENT),
+                .in6.sin6_scope_id = ifindex,
+        };
+        _cleanup_close_ int s = -EBADF;
+        int r;
+
+        assert(ifindex > 0);
+        assert(local_address);
+
+        src.in6.sin6_addr = *local_address;
+
+        s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_UDP);
+        if (s < 0)
+                return -errno;
+
+        r = setsockopt_int(s, IPPROTO_IPV6, IPV6_V6ONLY, true);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, false);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, SOL_SOCKET, SO_REUSEADDR, true);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, SOL_SOCKET, SO_TIMESTAMP, true);
+        if (r < 0)
+                return r;
+
+        r = bind(s, &src.sa, sizeof(src.in6));
+        if (r < 0)
+                return -errno;
+
+        return TAKE_FD(s);
+}
+
+int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address,
+                                  const void *packet, size_t len) {
+        union sockaddr_union dest = {
+                .in6.sin6_family = AF_INET6,
+                .in6.sin6_port = htobe16(DHCP6_PORT_SERVER),
+        };
+        int r;
+
+        assert(server_address);
+
+        memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr));
+
+        r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6));
+        if (r < 0)
+                return -errno;
+
+        return 0;
+}