1 files changed, 520 insertions, 0 deletions
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
new file mode 100644
index 00000000..f1cb1f56
--- /dev/null
+++ b/net/batman-adv/main.c
@@ -0,0 +1,520 @@
+/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License 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 Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/crc32c.h>
+#include <linux/highmem.h>
+#include "main.h"
+#include "sysfs.h"
+#include "debugfs.h"
+#include "routing.h"
+#include "send.h"
+#include "originator.h"
+#include "soft-interface.h"
+#include "icmp_socket.h"
+#include "translation-table.h"
+#include "hard-interface.h"
+#include "gateway_client.h"
+#include "bridge_loop_avoidance.h"
+#include "distributed-arp-table.h"
+#include "vis.h"
+#include "hash.h"
+#include "bat_algo.h"
+#include "network-coding.h"
+
+
+/* List manipulations on hardif_list have to be rtnl_lock()'ed,
+ * list traversals just rcu-locked
+ */
+struct list_head batadv_hardif_list;
+static int (*batadv_rx_handler[256])(struct sk_buff *,
+				     struct batadv_hard_iface *);
+char batadv_routing_algo[20] = "BATMAN_IV";
+static struct hlist_head batadv_algo_list;
+
+unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+
+struct workqueue_struct *batadv_event_workqueue;
+
+static void batadv_recv_handler_init(void);
+
+static int __init batadv_init(void)
+{
+	INIT_LIST_HEAD(&batadv_hardif_list);
+	INIT_HLIST_HEAD(&batadv_algo_list);
+
+	batadv_recv_handler_init();
+
+	batadv_iv_init();
+	batadv_nc_init();
+
+	batadv_event_workqueue = create_singlethread_workqueue("bat_events");
+
+	if (!batadv_event_workqueue)
+		return -ENOMEM;
+
+	batadv_socket_init();
+	batadv_debugfs_init();
+
+	register_netdevice_notifier(&batadv_hard_if_notifier);
+	rtnl_link_register(&batadv_link_ops);
+
+	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
+		BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
+
+	return 0;
+}
+
+static void __exit batadv_exit(void)
+{
+	batadv_debugfs_destroy();
+	rtnl_link_unregister(&batadv_link_ops);
+	unregister_netdevice_notifier(&batadv_hard_if_notifier);
+	batadv_hardif_remove_interfaces();
+
+	flush_workqueue(batadv_event_workqueue);
+	destroy_workqueue(batadv_event_workqueue);
+	batadv_event_workqueue = NULL;
+
+	rcu_barrier();
+}
+
+int batadv_mesh_init(struct net_device *soft_iface)
+{
+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+	int ret;
+
+	spin_lock_init(&bat_priv->forw_bat_list_lock);
+	spin_lock_init(&bat_priv->forw_bcast_list_lock);
+	spin_lock_init(&bat_priv->tt.changes_list_lock);
+	spin_lock_init(&bat_priv->tt.req_list_lock);
+	spin_lock_init(&bat_priv->tt.roam_list_lock);
+	spin_lock_init(&bat_priv->tt.last_changeset_lock);
+	spin_lock_init(&bat_priv->gw.list_lock);
+	spin_lock_init(&bat_priv->vis.hash_lock);
+	spin_lock_init(&bat_priv->vis.list_lock);
+
+	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
+	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
+	INIT_HLIST_HEAD(&bat_priv->gw.list);
+	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
+	INIT_LIST_HEAD(&bat_priv->tt.req_list);
+	INIT_LIST_HEAD(&bat_priv->tt.roam_list);
+
+	ret = batadv_originator_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
+	ret = batadv_tt_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
+	batadv_tt_local_add(soft_iface, soft_iface->dev_addr,
+			    BATADV_NULL_IFINDEX);
+
+	ret = batadv_vis_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
+	ret = batadv_bla_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
+	ret = batadv_dat_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
+	ret = batadv_nc_mesh_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
+	atomic_set(&bat_priv->gw.reselect, 0);
+	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
+
+	return 0;
+
+err:
+	batadv_mesh_free(soft_iface);
+	return ret;
+}
+
+void batadv_mesh_free(struct net_device *soft_iface)
+{
+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+
+	atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
+
+	batadv_purge_outstanding_packets(bat_priv, NULL);
+
+	batadv_vis_quit(bat_priv);
+
+	batadv_gw_node_purge(bat_priv);
+	batadv_nc_mesh_free(bat_priv);
+	batadv_dat_free(bat_priv);
+	batadv_bla_free(bat_priv);
+
+	/* Free the TT and the originator tables only after having terminated
+	 * all the other depending components which may use these structures for
+	 * their purposes.
+	 */
+	batadv_tt_free(bat_priv);
+
+	/* Since the originator table clean up routine is accessing the TT
+	 * tables as well, it has to be invoked after the TT tables have been
+	 * freed and marked as empty. This ensures that no cleanup RCU callbacks
+	 * accessing the TT data are scheduled for later execution.
+	 */
+	batadv_originator_free(bat_priv);
+
+	free_percpu(bat_priv->bat_counters);
+	bat_priv->bat_counters = NULL;
+
+	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
+}
+
+/**
+ * batadv_is_my_mac - check if the given mac address belongs to any of the real
+ * interfaces in the current mesh
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the address to check
+ */
+int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr)
+{
+	const struct batadv_hard_iface *hard_iface;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if (hard_iface->if_status != BATADV_IF_ACTIVE)
+			continue;
+
+		if (hard_iface->soft_iface != bat_priv->soft_iface)
+			continue;
+
+		if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
+			rcu_read_unlock();
+			return 1;
+		}
+	}
+	rcu_read_unlock();
+	return 0;
+}
+
+/**
+ * batadv_seq_print_text_primary_if_get - called from debugfs table printing
+ *  function that requires the primary interface
+ * @seq: debugfs table seq_file struct
+ *
+ * Returns primary interface if found or NULL otherwise.
+ */
+struct batadv_hard_iface *
+batadv_seq_print_text_primary_if_get(struct seq_file *seq)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct batadv_priv *bat_priv = netdev_priv(net_dev);
+	struct batadv_hard_iface *primary_if;
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+
+	if (!primary_if) {
+		seq_printf(seq,
+			   "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
+			   net_dev->name);
+		goto out;
+	}
+
+	if (primary_if->if_status == BATADV_IF_ACTIVE)
+		goto out;
+
+	seq_printf(seq,
+		   "BATMAN mesh %s disabled - primary interface not active\n",
+		   net_dev->name);
+	batadv_hardif_free_ref(primary_if);
+	primary_if = NULL;
+
+out:
+	return primary_if;
+}
+
+static int batadv_recv_unhandled_packet(struct sk_buff *skb,
+					struct batadv_hard_iface *recv_if)
+{
+	return NET_RX_DROP;
+}
+
+/* incoming packets with the batman ethertype received on any active hard
+ * interface
+ */
+int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
+			   struct packet_type *ptype,
+			   struct net_device *orig_dev)
+{
+	struct batadv_priv *bat_priv;
+	struct batadv_ogm_packet *batadv_ogm_packet;
+	struct batadv_hard_iface *hard_iface;
+	uint8_t idx;
+	int ret;
+
+	hard_iface = container_of(ptype, struct batadv_hard_iface,
+				  batman_adv_ptype);
+	skb = skb_share_check(skb, GFP_ATOMIC);
+
+	/* skb was released by skb_share_check() */
+	if (!skb)
+		goto err_out;
+
+	/* packet should hold at least type and version */
+	if (unlikely(!pskb_may_pull(skb, 2)))
+		goto err_free;
+
+	/* expect a valid ethernet header here. */
+	if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
+		goto err_free;
+
+	if (!hard_iface->soft_iface)
+		goto err_free;
+
+	bat_priv = netdev_priv(hard_iface->soft_iface);
+
+	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+		goto err_free;
+
+	/* discard frames on not active interfaces */
+	if (hard_iface->if_status != BATADV_IF_ACTIVE)
+		goto err_free;
+
+	batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
+
+	if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
+		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
+			   "Drop packet: incompatible batman version (%i)\n",
+			   batadv_ogm_packet->header.version);
+		goto err_free;
+	}
+
+	/* all receive handlers return whether they received or reused
+	 * the supplied skb. if not, we have to free the skb.
+	 */
+	idx = batadv_ogm_packet->header.packet_type;
+	ret = (*batadv_rx_handler[idx])(skb, hard_iface);
+
+	if (ret == NET_RX_DROP)
+		kfree_skb(skb);
+
+	/* return NET_RX_SUCCESS in any case as we
+	 * most probably dropped the packet for
+	 * routing-logical reasons.
+	 */
+	return NET_RX_SUCCESS;
+
+err_free:
+	kfree_skb(skb);
+err_out:
+	return NET_RX_DROP;
+}
+
+static void batadv_recv_handler_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
+		batadv_rx_handler[i] = batadv_recv_unhandled_packet;
+
+	/* batman icmp packet */
+	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
+	/* unicast with 4 addresses packet */
+	batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
+	/* unicast packet */
+	batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
+	/* fragmented unicast packet */
+	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
+	/* broadcast packet */
+	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
+	/* vis packet */
+	batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
+	/* Translation table query (request or response) */
+	batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
+	/* Roaming advertisement */
+	batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
+}
+
+int
+batadv_recv_handler_register(uint8_t packet_type,
+			     int (*recv_handler)(struct sk_buff *,
+						 struct batadv_hard_iface *))
+{
+	if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
+		return -EBUSY;
+
+	batadv_rx_handler[packet_type] = recv_handler;
+	return 0;
+}
+
+void batadv_recv_handler_unregister(uint8_t packet_type)
+{
+	batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
+}
+
+static struct batadv_algo_ops *batadv_algo_get(char *name)
+{
+	struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
+
+	hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
+		if (strcmp(bat_algo_ops_tmp->name, name) != 0)
+			continue;
+
+		bat_algo_ops = bat_algo_ops_tmp;
+		break;
+	}
+
+	return bat_algo_ops;
+}
+
+int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
+{
+	struct batadv_algo_ops *bat_algo_ops_tmp;
+	int ret;
+
+	bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
+	if (bat_algo_ops_tmp) {
+		pr_info("Trying to register already registered routing algorithm: %s\n",
+			bat_algo_ops->name);
+		ret = -EEXIST;
+		goto out;
+	}
+
+	/* all algorithms must implement all ops (for now) */
+	if (!bat_algo_ops->bat_iface_enable ||
+	    !bat_algo_ops->bat_iface_disable ||
+	    !bat_algo_ops->bat_iface_update_mac ||
+	    !bat_algo_ops->bat_primary_iface_set ||
+	    !bat_algo_ops->bat_ogm_schedule ||
+	    !bat_algo_ops->bat_ogm_emit) {
+		pr_info("Routing algo '%s' does not implement required ops\n",
+			bat_algo_ops->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	INIT_HLIST_NODE(&bat_algo_ops->list);
+	hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
+	ret = 0;
+
+out:
+	return ret;
+}
+
+int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
+{
+	struct batadv_algo_ops *bat_algo_ops;
+	int ret = -EINVAL;
+
+	bat_algo_ops = batadv_algo_get(name);
+	if (!bat_algo_ops)
+		goto out;
+
+	bat_priv->bat_algo_ops = bat_algo_ops;
+	ret = 0;
+
+out:
+	return ret;
+}
+
+int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct batadv_algo_ops *bat_algo_ops;
+
+	seq_puts(seq, "Available routing algorithms:\n");
+
+	hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
+		seq_printf(seq, "%s\n", bat_algo_ops->name);
+	}
+
+	return 0;
+}
+
+/**
+ * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
+ *  the header
+ * @skb: skb pointing to fragmented socket buffers
+ * @payload_ptr: Pointer to position inside the head buffer of the skb
+ *  marking the start of the data to be CRC'ed
+ *
+ * payload_ptr must always point to an address in the skb head buffer and not to
+ * a fragment.
+ */
+__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
+{
+	u32 crc = 0;
+	unsigned int from;
+	unsigned int to = skb->len;
+	struct skb_seq_state st;
+	const u8 *data;
+	unsigned int len;
+	unsigned int consumed = 0;
+
+	from = (unsigned int)(payload_ptr - skb->data);
+
+	skb_prepare_seq_read(skb, from, to, &st);
+	while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
+		crc = crc32c(crc, data, len);
+		consumed += len;
+	}
+	skb_abort_seq_read(&st);
+
+	return htonl(crc);
+}
+
+static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
+{
+	struct batadv_algo_ops *bat_algo_ops;
+	char *algo_name = (char *)val;
+	size_t name_len = strlen(algo_name);
+
+	if (name_len > 0 && algo_name[name_len - 1] == '\n')
+		algo_name[name_len - 1] = '\0';
+
+	bat_algo_ops = batadv_algo_get(algo_name);
+	if (!bat_algo_ops) {
+		pr_err("Routing algorithm '%s' is not supported\n", algo_name);
+		return -EINVAL;
+	}
+
+	return param_set_copystring(algo_name, kp);
+}
+
+static const struct kernel_param_ops batadv_param_ops_ra = {
+	.set = batadv_param_set_ra,
+	.get = param_get_string,
+};
+
+static struct kparam_string batadv_param_string_ra = {
+	.maxlen = sizeof(batadv_routing_algo),
+	.string = batadv_routing_algo,
+};
+
+module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
+		0644);
+module_init(batadv_init);
+module_exit(batadv_exit);
+
+MODULE_LICENSE("GPL");
+
+MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
+MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
+MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
+MODULE_VERSION(BATADV_SOURCE_VERSION);