Merged rt35711c (DHCPv4-over-DHCPv6 support) (new files)

1 files changed, 116 insertions, 0 deletions

diff --git a/common/dhcp4o6.c b/common/dhcp4o6.c
new file mode 100644
index 00000000..4bd074c6
--- /dev/null
+++ b/common/dhcp4o6.c
@@ -0,0 +1,116 @@
+/* dhcp4o6.c
+
+   DHCPv4 over DHCPv6 shared code... */
+
+/*
+ * Copyright (c) 2016 by Internet Systems Consortium, Inc. ("ISC")
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ *   Internet Systems Consortium, Inc.
+ *   950 Charter Street
+ *   Redwood City, CA 94063
+ *   <info@isc.org>
+ *   https://www.isc.org/
+ *
+ */
+
+#include "dhcpd.h"
+
+#ifdef DHCP4o6
+
+int dhcp4o6_fd = -1;
+omapi_object_t *dhcp4o6_object = NULL;
+omapi_object_type_t *dhcp4o6_type = NULL;
+
+static int dhcp4o6_readsocket(omapi_object_t *);
+
+/*
+ * DHCPv4 over DHCPv6 Inter Process Communication setup
+ *
+ * A UDP socket is created between ::1 port and ::1 port + 1
+ * (port is given in network order, the DHCPv6 side is bound to port,
+ *  the DHCPv4 side to port + 1. The socket descriptor is stored into
+ *  dhcp4o6_fd and an OMAPI handler is registered. Any failure is fatal.)
+ */
+void dhcp4o6_setup(u_int16_t port) {
+	struct sockaddr_in6 local6, remote6;
+	int flag;
+	isc_result_t status;
+
+	/* Register DHCPv4 over DHCPv6 forwarding. */
+	memset(&local6, 0, sizeof(local6));
+	local6.sin6_family = AF_INET6;
+	if (local_family == AF_INET6)
+		local6.sin6_port = port;
+	else
+		local6.sin6_port = htons(ntohs(port) + 1);
+	local6.sin6_addr.s6_addr[15] = 1;
+#ifdef HAVE_SA_LEN
+	local6.sin6_len = sizeof(local6);
+#endif
+	memset(&remote6, 0, sizeof(remote6));
+	remote6.sin6_family = AF_INET6;
+	if (local_family == AF_INET6)
+		remote6.sin6_port = htons(ntohs(port) + 1);
+	else
+		remote6.sin6_port = port;
+	remote6.sin6_addr.s6_addr[15] = 1;
+#ifdef HAVE_SA_LEN
+	remote6.sin6_len = sizeof(remote6);
+#endif
+
+	dhcp4o6_fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
+	if (dhcp4o6_fd < 0)
+		log_fatal("Can't create dhcp4o6 socket: %m");
+	flag = 1;
+	if (setsockopt(dhcp4o6_fd, SOL_SOCKET, SO_REUSEADDR,
+		       (char *)&flag, sizeof(flag)) < 0)
+		log_fatal("Can't set SO_REUSEADDR option "
+			  "on dhcp4o6 socket: %m");
+	if (bind(dhcp4o6_fd,
+		 (struct sockaddr *)&local6,
+		 sizeof(local6)) < 0)
+		log_fatal("Can't bind dhcp4o6 socket: %m");
+	if (connect(dhcp4o6_fd,
+		    (struct sockaddr *)&remote6,
+		    sizeof(remote6)) < 0)
+		log_fatal("Can't connect dhcp4o6 socket: %m");
+
+	/* Omapi stuff. */
+	/* TODO: add tracing support. */
+	status = omapi_object_type_register(&dhcp4o6_type,
+					    "dhcp4o6",
+					    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+					    sizeof(*dhcp4o6_object),
+					    0, RC_MISC);
+	if (status != ISC_R_SUCCESS)
+		log_fatal("Can't register dhcp4o6 type: %s",
+			  isc_result_totext(status));
+	status = omapi_object_allocate(&dhcp4o6_object, dhcp4o6_type, 0, MDL);
+	if (status != ISC_R_SUCCESS)
+		log_fatal("Can't allocate dhcp4o6 object: %s",
+			  isc_result_totext(status));
+	status = omapi_register_io_object(dhcp4o6_object,
+					  dhcp4o6_readsocket, 0,
+					  dhcpv4o6_handler, 0, 0);
+	if (status != ISC_R_SUCCESS)
+		log_fatal("Can't register dhcp4o6 handle: %s",
+			  isc_result_totext(status));
+}
+
+static int dhcp4o6_readsocket(omapi_object_t *h) {
+	IGNORE_UNUSED(h);
+	return dhcp4o6_fd;
+}
+#endif /* DHCP4o6 */