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-rw-r--r--src/ipv6pd.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/src/ipv6pd.c b/src/ipv6pd.c
new file mode 100644
index 0000000..5ecda38
--- /dev/null
+++ b/src/ipv6pd.c
@@ -0,0 +1,383 @@
+/*
+ *
+ * Connection Manager
+ *
+ * Copyright (C) 2013 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "connman.h"
+
+#include <gdhcp/gdhcp.h>
+
+#define DEFAULT_ROUTER_LIFETIME 180 /* secs */
+#define DEFAULT_RA_INTERVAL 120 /* secs */
+
+static int bridge_index = -1;
+static guint timer_uplink;
+static guint timer_ra;
+static char *default_interface;
+static GSList *prefixes;
+static GHashTable *timer_hash;
+static void *rs_context;
+
+static int setup_prefix_delegation(struct connman_service *service);
+static void dhcpv6_callback(struct connman_network *network,
+ enum __connman_dhcpv6_status status, gpointer data);
+
+static int enable_ipv6_forward(bool enable)
+{
+ FILE *f;
+
+ f = fopen("/proc/sys/net/ipv6/ip_forward", "r+");
+ if (!f)
+ return -errno;
+
+ if (enable)
+ fprintf(f, "1");
+ else
+ fprintf(f, "0");
+
+ fclose(f);
+
+ return 0;
+}
+
+static gboolean send_ra(gpointer data)
+{
+ __connman_inet_ipv6_send_ra(bridge_index, NULL, prefixes,
+ DEFAULT_ROUTER_LIFETIME);
+
+ return TRUE;
+}
+
+static void start_ra(int ifindex, GSList *prefix)
+{
+ if (prefixes)
+ g_slist_free_full(prefixes, g_free);
+
+ prefixes = g_dhcpv6_copy_prefixes(prefix);
+
+ enable_ipv6_forward(true);
+
+ if (timer_ra > 0)
+ g_source_remove(timer_ra);
+
+ send_ra(NULL);
+
+ timer_ra = g_timeout_add_seconds(DEFAULT_RA_INTERVAL, send_ra, NULL);
+}
+
+static void stop_ra(int ifindex)
+{
+ __connman_inet_ipv6_send_ra(ifindex, NULL, prefixes, 0);
+
+ if (timer_ra > 0) {
+ g_source_remove(timer_ra);
+ timer_ra = 0;
+ }
+
+ enable_ipv6_forward(false);
+
+ if (prefixes) {
+ g_slist_free_full(prefixes, g_free);
+ prefixes = NULL;
+ }
+}
+
+static void rs_received(struct nd_router_solicit *reply,
+ unsigned int length, void *user_data)
+{
+ GDHCPIAPrefix *prefix;
+ GSList *list;
+
+ if (!prefixes)
+ return;
+
+ DBG("");
+
+ for (list = prefixes; list; list = list->next) {
+ prefix = list->data;
+
+ prefix->valid -= time(NULL) - prefix->expire;
+ prefix->preferred -= time(NULL) - prefix->expire;
+ }
+
+ __connman_inet_ipv6_send_ra(bridge_index, NULL, prefixes,
+ DEFAULT_ROUTER_LIFETIME);
+}
+
+static gboolean do_setup(gpointer data)
+{
+ int ret;
+
+ timer_uplink = 0;
+
+ if (!default_interface)
+ DBG("No uplink connection, retrying prefix delegation");
+
+ ret = setup_prefix_delegation(__connman_service_get_default());
+ if (ret < 0 && ret != -EINPROGRESS)
+ return TRUE; /* delegation error, try again */
+
+ return FALSE;
+}
+
+static void dhcpv6_renew_callback(struct connman_network *network,
+ enum __connman_dhcpv6_status status,
+ gpointer data)
+{
+ DBG("network %p status %d data %p", network, status, data);
+
+ if (status == CONNMAN_DHCPV6_STATUS_SUCCEED)
+ dhcpv6_callback(network, status, data);
+ else
+ setup_prefix_delegation(__connman_service_get_default());
+}
+
+static void cleanup(void)
+{
+ if (timer_uplink != 0) {
+ g_source_remove(timer_uplink);
+ timer_uplink = 0;
+ }
+
+ g_hash_table_destroy(timer_hash);
+ timer_hash = NULL;
+
+ if (prefixes) {
+ g_slist_free_full(prefixes, g_free);
+ prefixes = NULL;
+ }
+}
+
+static void dhcpv6_callback(struct connman_network *network,
+ enum __connman_dhcpv6_status status, gpointer data)
+{
+ GSList *prefix_list = data;
+
+ DBG("network %p status %d data %p", network, status, data);
+
+ if (status == CONNMAN_DHCPV6_STATUS_FAIL) {
+ DBG("Prefix delegation request failed");
+ cleanup();
+ return;
+ }
+
+ if (!prefix_list) {
+ DBG("No prefixes, retrying");
+ if (timer_uplink == 0)
+ timer_uplink = g_timeout_add_seconds(10, do_setup,
+ NULL);
+ return;
+ }
+
+ /*
+ * After we have got a list of prefixes, we can start to send router
+ * advertisements (RA) to tethering interface.
+ */
+ start_ra(bridge_index, prefix_list);
+
+ if (__connman_dhcpv6_start_pd_renew(network,
+ dhcpv6_renew_callback) == -ETIMEDOUT)
+ dhcpv6_renew_callback(network, CONNMAN_DHCPV6_STATUS_FAIL,
+ NULL);
+}
+
+static int setup_prefix_delegation(struct connman_service *service)
+{
+ struct connman_ipconfig *ipconfig;
+ char *interface;
+ int err = 0, ifindex;
+
+ if (!service) {
+ /*
+ * We do not have uplink connection. We just wait until
+ * default interface is updated.
+ */
+ return -EINPROGRESS;
+ }
+
+ interface = connman_service_get_interface(service);
+
+ DBG("interface %s bridge_index %d", interface, bridge_index);
+
+ if (default_interface) {
+ stop_ra(bridge_index);
+
+ ifindex = connman_inet_ifindex(default_interface);
+ __connman_dhcpv6_stop_pd(ifindex);
+ }
+
+ g_free(default_interface);
+
+ ipconfig = __connman_service_get_ip6config(service);
+ if (!__connman_ipconfig_ipv6_is_enabled(ipconfig)) {
+ g_free(interface);
+ default_interface = NULL;
+ return -EPFNOSUPPORT;
+ }
+
+ default_interface = interface;
+
+ if (default_interface) {
+ ifindex = connman_inet_ifindex(default_interface);
+
+ /*
+ * Try to get a IPv6 prefix so we can start to advertise it.
+ */
+ err = __connman_dhcpv6_start_pd(ifindex, prefixes,
+ dhcpv6_callback);
+ if (err < 0)
+ DBG("prefix delegation %d/%s", err, strerror(-err));
+ }
+
+ return err;
+}
+
+static void cleanup_timer(gpointer user_data)
+{
+ guint timer = GPOINTER_TO_UINT(user_data);
+
+ g_source_remove(timer);
+}
+
+static void update_default_interface(struct connman_service *service)
+{
+ setup_prefix_delegation(service);
+}
+
+static void update_ipconfig(struct connman_service *service,
+ struct connman_ipconfig *ipconfig)
+{
+ if (!service || service != __connman_service_get_default())
+ return;
+
+ if (ipconfig != __connman_service_get_ip6config(service))
+ return;
+
+ if (!__connman_ipconfig_ipv6_is_enabled(ipconfig)) {
+ if (default_interface) {
+ int ifindex;
+
+ ifindex = connman_inet_ifindex(default_interface);
+ __connman_dhcpv6_stop_pd(ifindex);
+
+ g_free(default_interface);
+ default_interface = NULL;
+ }
+
+ DBG("No IPv6 support for interface index %d",
+ __connman_ipconfig_get_index(ipconfig));
+ return;
+ }
+
+ /*
+ * Did we had PD activated already? If not, then start it.
+ */
+ if (!default_interface) {
+ DBG("IPv6 ipconfig %p changed for interface index %d", ipconfig,
+ __connman_ipconfig_get_index(ipconfig));
+
+ setup_prefix_delegation(service);
+ }
+}
+
+static struct connman_notifier pd_notifier = {
+ .name = "IPv6 prefix delegation",
+ .default_changed = update_default_interface,
+ .ipconfig_changed = update_ipconfig,
+};
+
+int __connman_ipv6pd_setup(const char *bridge)
+{
+ struct connman_service *service;
+ int err;
+
+ if (!connman_inet_is_ipv6_supported())
+ return -EPFNOSUPPORT;
+
+ if (bridge_index >= 0) {
+ DBG("Prefix delegation already running");
+ return -EALREADY;
+ }
+
+ err = connman_notifier_register(&pd_notifier);
+ if (err < 0)
+ return err;
+
+ bridge_index = connman_inet_ifindex(bridge);
+
+ timer_hash = g_hash_table_new_full(g_direct_hash, g_direct_equal,
+ NULL, cleanup_timer);
+
+ err = __connman_inet_ipv6_start_recv_rs(bridge_index, rs_received,
+ NULL, &rs_context);
+ if (err < 0)
+ DBG("Cannot receive router solicitation %d/%s",
+ err, strerror(-err));
+
+ service = __connman_service_get_default();
+ if (service) {
+ /*
+ * We have an uplink connection already, try to use it.
+ */
+ return setup_prefix_delegation(service);
+ }
+
+ /*
+ * The prefix delegation is started after have got the uplink
+ * connection up i.e., when the default service is setup in which
+ * case the update_default_interface() will be called.
+ */
+ return -EINPROGRESS;
+}
+
+void __connman_ipv6pd_cleanup(void)
+{
+ int ifindex;
+
+ if (!connman_inet_is_ipv6_supported())
+ return;
+
+ connman_notifier_unregister(&pd_notifier);
+
+ __connman_inet_ipv6_stop_recv_rs(rs_context);
+ rs_context = NULL;
+
+ cleanup();
+
+ stop_ra(bridge_index);
+
+ if (default_interface) {
+ ifindex = connman_inet_ifindex(default_interface);
+ __connman_dhcpv6_stop_pd(ifindex);
+ g_free(default_interface);
+ default_interface = NULL;
+ }
+
+ bridge_index = -1;
+}