1 files changed, 651 insertions, 0 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
new file mode 100644
index 000000000000..4f95777ce080
--- /dev/null
+++ b/net/batman-adv/hard-interface.c
@@ -0,0 +1,651 @@
+/*
+ * Copyright (C) 2007-2010 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 "main.h"
+#include "hard-interface.h"
+#include "soft-interface.h"
+#include "send.h"
+#include "translation-table.h"
+#include "routing.h"
+#include "bat_sysfs.h"
+#include "originator.h"
+#include "hash.h"
+
+#include <linux/if_arp.h>
+
+/* protect update critical side of if_list - but not the content */
+static DEFINE_SPINLOCK(if_list_lock);
+
+static void hardif_free_rcu(struct rcu_head *rcu)
+{
+        struct batman_if *batman_if;
+
+        batman_if = container_of(rcu, struct batman_if, rcu);
+        dev_put(batman_if->net_dev);
+        kref_put(&batman_if->refcount, hardif_free_ref);
+}
+
+struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
+{
+        struct batman_if *batman_if;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(batman_if, &if_list, list) {
+                if (batman_if->net_dev == net_dev)
+                        goto out;
+        }
+
+        batman_if = NULL;
+
+out:
+        if (batman_if)
+                kref_get(&batman_if->refcount);
+
+        rcu_read_unlock();
+        return batman_if;
+}
+
+static int is_valid_iface(struct net_device *net_dev)
+{
+        if (net_dev->flags & IFF_LOOPBACK)
+                return 0;
+
+        if (net_dev->type != ARPHRD_ETHER)
+                return 0;
+
+        if (net_dev->addr_len != ETH_ALEN)
+                return 0;
+
+        /* no batman over batman */
+#ifdef HAVE_NET_DEVICE_OPS
+        if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
+                return 0;
+#else
+        if (net_dev->hard_start_xmit == interface_tx)
+                return 0;
+#endif
+
+        /* Device is being bridged */
+        /* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
+                return 0; */
+
+        return 1;
+}
+
+static struct batman_if *get_active_batman_if(struct net_device *soft_iface)
+{
+        struct batman_if *batman_if;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(batman_if, &if_list, list) {
+                if (batman_if->soft_iface != soft_iface)
+                        continue;
+
+                if (batman_if->if_status == IF_ACTIVE)
+                        goto out;
+        }
+
+        batman_if = NULL;
+
+out:
+        if (batman_if)
+                kref_get(&batman_if->refcount);
+
+        rcu_read_unlock();
+        return batman_if;
+}
+
+static void update_primary_addr(struct bat_priv *bat_priv)
+{
+        struct vis_packet *vis_packet;
+
+        vis_packet = (struct vis_packet *)
+                                bat_priv->my_vis_info->skb_packet->data;
+        memcpy(vis_packet->vis_orig,
+               bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+        memcpy(vis_packet->sender_orig,
+               bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+}
+
+static void set_primary_if(struct bat_priv *bat_priv,
+                           struct batman_if *batman_if)
+{
+        struct batman_packet *batman_packet;
+        struct batman_if *old_if;
+
+        if (batman_if)
+                kref_get(&batman_if->refcount);
+
+        old_if = bat_priv->primary_if;
+        bat_priv->primary_if = batman_if;
+
+        if (old_if)
+                kref_put(&old_if->refcount, hardif_free_ref);
+
+        if (!bat_priv->primary_if)
+                return;
+
+        batman_packet = (struct batman_packet *)(batman_if->packet_buff);
+        batman_packet->flags = PRIMARIES_FIRST_HOP;
+        batman_packet->ttl = TTL;
+
+        update_primary_addr(bat_priv);
+
+        /***
+         * hacky trick to make sure that we send the HNA information via
+         * our new primary interface
+         */
+        atomic_set(&bat_priv->hna_local_changed, 1);
+}
+
+static bool hardif_is_iface_up(struct batman_if *batman_if)
+{
+        if (batman_if->net_dev->flags & IFF_UP)
+                return true;
+
+        return false;
+}
+
+static void update_mac_addresses(struct batman_if *batman_if)
+{
+        memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
+               batman_if->net_dev->dev_addr, ETH_ALEN);
+        memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
+               batman_if->net_dev->dev_addr, ETH_ALEN);
+}
+
+static void check_known_mac_addr(struct net_device *net_dev)
+{
+        struct batman_if *batman_if;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(batman_if, &if_list, list) {
+                if ((batman_if->if_status != IF_ACTIVE) &&
+                    (batman_if->if_status != IF_TO_BE_ACTIVATED))
+                        continue;
+
+                if (batman_if->net_dev == net_dev)
+                        continue;
+
+                if (!compare_orig(batman_if->net_dev->dev_addr,
+                                  net_dev->dev_addr))
+                        continue;
+
+                pr_warning("The newly added mac address (%pM) already exists "
+                           "on: %s\n", net_dev->dev_addr,
+                           batman_if->net_dev->name);
+                pr_warning("It is strongly recommended to keep mac addresses "
+                           "unique to avoid problems!\n");
+        }
+        rcu_read_unlock();
+}
+
+int hardif_min_mtu(struct net_device *soft_iface)
+{
+        struct bat_priv *bat_priv = netdev_priv(soft_iface);
+        struct batman_if *batman_if;
+        /* allow big frames if all devices are capable to do so
+         * (have MTU > 1500 + BAT_HEADER_LEN) */
+        int min_mtu = ETH_DATA_LEN;
+
+        if (atomic_read(&bat_priv->fragmentation))
+                goto out;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(batman_if, &if_list, list) {
+                if ((batman_if->if_status != IF_ACTIVE) &&
+                    (batman_if->if_status != IF_TO_BE_ACTIVATED))
+                        continue;
+
+                if (batman_if->soft_iface != soft_iface)
+                        continue;
+
+                min_mtu = min_t(int, batman_if->net_dev->mtu - BAT_HEADER_LEN,
+                                min_mtu);
+        }
+        rcu_read_unlock();
+out:
+        return min_mtu;
+}
+
+/* adjusts the MTU if a new interface with a smaller MTU appeared. */
+void update_min_mtu(struct net_device *soft_iface)
+{
+        int min_mtu;
+
+        min_mtu = hardif_min_mtu(soft_iface);
+        if (soft_iface->mtu != min_mtu)
+                soft_iface->mtu = min_mtu;
+}
+
+static void hardif_activate_interface(struct batman_if *batman_if)
+{
+        struct bat_priv *bat_priv;
+
+        if (batman_if->if_status != IF_INACTIVE)
+                return;
+
+        bat_priv = netdev_priv(batman_if->soft_iface);
+
+        update_mac_addresses(batman_if);
+        batman_if->if_status = IF_TO_BE_ACTIVATED;
+
+        /**
+         * the first active interface becomes our primary interface or
+         * the next active interface after the old primay interface was removed
+         */
+        if (!bat_priv->primary_if)
+                set_primary_if(bat_priv, batman_if);
+
+        bat_info(batman_if->soft_iface, "Interface activated: %s\n",
+                 batman_if->net_dev->name);
+
+        update_min_mtu(batman_if->soft_iface);
+        return;
+}
+
+static void hardif_deactivate_interface(struct batman_if *batman_if)
+{
+        if ((batman_if->if_status != IF_ACTIVE) &&
+           (batman_if->if_status != IF_TO_BE_ACTIVATED))
+                return;
+
+        batman_if->if_status = IF_INACTIVE;
+
+        bat_info(batman_if->soft_iface, "Interface deactivated: %s\n",
+                 batman_if->net_dev->name);
+
+        update_min_mtu(batman_if->soft_iface);
+}
+
+int hardif_enable_interface(struct batman_if *batman_if, char *iface_name)
+{
+        struct bat_priv *bat_priv;
+        struct batman_packet *batman_packet;
+
+        if (batman_if->if_status != IF_NOT_IN_USE)
+                goto out;
+
+        batman_if->soft_iface = dev_get_by_name(&init_net, iface_name);
+
+        if (!batman_if->soft_iface) {
+                batman_if->soft_iface = softif_create(iface_name);
+
+                if (!batman_if->soft_iface)
+                        goto err;
+
+                /* dev_get_by_name() increases the reference counter for us */
+                dev_hold(batman_if->soft_iface);
+        }
+
+        bat_priv = netdev_priv(batman_if->soft_iface);
+        batman_if->packet_len = BAT_PACKET_LEN;
+        batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
+
+        if (!batman_if->packet_buff) {
+                bat_err(batman_if->soft_iface, "Can't add interface packet "
+                        "(%s): out of memory\n", batman_if->net_dev->name);
+                goto err;
+        }
+
+        batman_packet = (struct batman_packet *)(batman_if->packet_buff);
+        batman_packet->packet_type = BAT_PACKET;
+        batman_packet->version = COMPAT_VERSION;
+        batman_packet->flags = 0;
+        batman_packet->ttl = 2;
+        batman_packet->tq = TQ_MAX_VALUE;
+        batman_packet->num_hna = 0;
+
+        batman_if->if_num = bat_priv->num_ifaces;
+        bat_priv->num_ifaces++;
+        batman_if->if_status = IF_INACTIVE;
+        orig_hash_add_if(batman_if, bat_priv->num_ifaces);
+
+        batman_if->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
+        batman_if->batman_adv_ptype.func = batman_skb_recv;
+        batman_if->batman_adv_ptype.dev = batman_if->net_dev;
+        kref_get(&batman_if->refcount);
+        dev_add_pack(&batman_if->batman_adv_ptype);
+
+        atomic_set(&batman_if->seqno, 1);
+        atomic_set(&batman_if->frag_seqno, 1);
+        bat_info(batman_if->soft_iface, "Adding interface: %s\n",
+                 batman_if->net_dev->name);
+
+        if (atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu <
+                ETH_DATA_LEN + BAT_HEADER_LEN)
+                bat_info(batman_if->soft_iface,
+                        "The MTU of interface %s is too small (%i) to handle "
+                        "the transport of batman-adv packets. Packets going "
+                        "over this interface will be fragmented on layer2 "
+                        "which could impact the performance. Setting the MTU "
+                        "to %zi would solve the problem.\n",
+                        batman_if->net_dev->name, batman_if->net_dev->mtu,
+                        ETH_DATA_LEN + BAT_HEADER_LEN);
+
+        if (!atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu <
+                ETH_DATA_LEN + BAT_HEADER_LEN)
+                bat_info(batman_if->soft_iface,
+                        "The MTU of interface %s is too small (%i) to handle "
+                        "the transport of batman-adv packets. If you experience"
+                        " problems getting traffic through try increasing the "
+                        "MTU to %zi.\n",
+                        batman_if->net_dev->name, batman_if->net_dev->mtu,
+                        ETH_DATA_LEN + BAT_HEADER_LEN);
+
+        if (hardif_is_iface_up(batman_if))
+                hardif_activate_interface(batman_if);
+        else
+                bat_err(batman_if->soft_iface, "Not using interface %s "
+                        "(retrying later): interface not active\n",
+                        batman_if->net_dev->name);
+
+        /* begin scheduling originator messages on that interface */
+        schedule_own_packet(batman_if);
+
+out:
+        return 0;
+
+err:
+        return -ENOMEM;
+}
+
+void hardif_disable_interface(struct batman_if *batman_if)
+{
+        struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+
+        if (batman_if->if_status == IF_ACTIVE)
+                hardif_deactivate_interface(batman_if);
+
+        if (batman_if->if_status != IF_INACTIVE)
+                return;
+
+        bat_info(batman_if->soft_iface, "Removing interface: %s\n",
+                 batman_if->net_dev->name);
+        dev_remove_pack(&batman_if->batman_adv_ptype);
+        kref_put(&batman_if->refcount, hardif_free_ref);
+
+        bat_priv->num_ifaces--;
+        orig_hash_del_if(batman_if, bat_priv->num_ifaces);
+
+        if (batman_if == bat_priv->primary_if) {
+                struct batman_if *new_if;
+
+                new_if = get_active_batman_if(batman_if->soft_iface);
+                set_primary_if(bat_priv, new_if);
+
+                if (new_if)
+                        kref_put(&new_if->refcount, hardif_free_ref);
+        }
+
+        kfree(batman_if->packet_buff);
+        batman_if->packet_buff = NULL;
+        batman_if->if_status = IF_NOT_IN_USE;
+
+        /* delete all references to this batman_if */
+        purge_orig_ref(bat_priv);
+        purge_outstanding_packets(bat_priv, batman_if);
+        dev_put(batman_if->soft_iface);
+
+        /* nobody uses this interface anymore */
+        if (!bat_priv->num_ifaces)
+                softif_destroy(batman_if->soft_iface);
+
+        batman_if->soft_iface = NULL;
+}
+
+static struct batman_if *hardif_add_interface(struct net_device *net_dev)
+{
+        struct batman_if *batman_if;
+        int ret;
+
+        ret = is_valid_iface(net_dev);
+        if (ret != 1)
+                goto out;
+
+        dev_hold(net_dev);
+
+        batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
+        if (!batman_if) {
+                pr_err("Can't add interface (%s): out of memory\n",
+                       net_dev->name);
+                goto release_dev;
+        }
+
+        ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
+        if (ret)
+                goto free_if;
+
+        batman_if->if_num = -1;
+        batman_if->net_dev = net_dev;
+        batman_if->soft_iface = NULL;
+        batman_if->if_status = IF_NOT_IN_USE;
+        INIT_LIST_HEAD(&batman_if->list);
+        kref_init(&batman_if->refcount);
+
+        check_known_mac_addr(batman_if->net_dev);
+
+        spin_lock(&if_list_lock);
+        list_add_tail_rcu(&batman_if->list, &if_list);
+        spin_unlock(&if_list_lock);
+
+        /* extra reference for return */
+        kref_get(&batman_if->refcount);
+        return batman_if;
+
+free_if:
+        kfree(batman_if);
+release_dev:
+        dev_put(net_dev);
+out:
+        return NULL;
+}
+
+static void hardif_remove_interface(struct batman_if *batman_if)
+{
+        /* first deactivate interface */
+        if (batman_if->if_status != IF_NOT_IN_USE)
+                hardif_disable_interface(batman_if);
+
+        if (batman_if->if_status != IF_NOT_IN_USE)
+                return;
+
+        batman_if->if_status = IF_TO_BE_REMOVED;
+        sysfs_del_hardif(&batman_if->hardif_obj);
+        call_rcu(&batman_if->rcu, hardif_free_rcu);
+}
+
+void hardif_remove_interfaces(void)
+{
+        struct batman_if *batman_if, *batman_if_tmp;
+        struct list_head if_queue;
+
+        INIT_LIST_HEAD(&if_queue);
+
+        spin_lock(&if_list_lock);
+        list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list) {
+                list_del_rcu(&batman_if->list);
+                list_add_tail(&batman_if->list, &if_queue);
+        }
+        spin_unlock(&if_list_lock);
+
+        rtnl_lock();
+        list_for_each_entry_safe(batman_if, batman_if_tmp, &if_queue, list) {
+                hardif_remove_interface(batman_if);
+        }
+        rtnl_unlock();
+}
+
+static int hard_if_event(struct notifier_block *this,
+                         unsigned long event, void *ptr)
+{
+        struct net_device *net_dev = (struct net_device *)ptr;
+        struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+        struct bat_priv *bat_priv;
+
+        if (!batman_if && event == NETDEV_REGISTER)
+                batman_if = hardif_add_interface(net_dev);
+
+        if (!batman_if)
+                goto out;
+
+        switch (event) {
+        case NETDEV_UP:
+                hardif_activate_interface(batman_if);
+                break;
+        case NETDEV_GOING_DOWN:
+        case NETDEV_DOWN:
+                hardif_deactivate_interface(batman_if);
+                break;
+        case NETDEV_UNREGISTER:
+                spin_lock(&if_list_lock);
+                list_del_rcu(&batman_if->list);
+                spin_unlock(&if_list_lock);
+
+                hardif_remove_interface(batman_if);
+                break;
+        case NETDEV_CHANGEMTU:
+                if (batman_if->soft_iface)
+                        update_min_mtu(batman_if->soft_iface);
+                break;
+        case NETDEV_CHANGEADDR:
+                if (batman_if->if_status == IF_NOT_IN_USE)
+                        goto hardif_put;
+
+                check_known_mac_addr(batman_if->net_dev);
+                update_mac_addresses(batman_if);
+
+                bat_priv = netdev_priv(batman_if->soft_iface);
+                if (batman_if == bat_priv->primary_if)
+                        update_primary_addr(bat_priv);
+                break;
+        default:
+                break;
+        };
+
+hardif_put:
+        kref_put(&batman_if->refcount, hardif_free_ref);
+out:
+        return NOTIFY_DONE;
+}
+
+/* receive a packet with the batman ethertype coming on a hard
+ * interface */
+int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
+        struct packet_type *ptype, struct net_device *orig_dev)
+{
+        struct bat_priv *bat_priv;
+        struct batman_packet *batman_packet;
+        struct batman_if *batman_if;
+        int ret;
+
+        batman_if = container_of(ptype, struct batman_if, 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 != sizeof(struct ethhdr)
+                                || !skb_mac_header(skb)))
+                goto err_free;
+
+        if (!batman_if->soft_iface)
+                goto err_free;
+
+        bat_priv = netdev_priv(batman_if->soft_iface);
+
+        if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+                goto err_free;
+
+        /* discard frames on not active interfaces */
+        if (batman_if->if_status != IF_ACTIVE)
+                goto err_free;
+
+        batman_packet = (struct batman_packet *)skb->data;
+
+        if (batman_packet->version != COMPAT_VERSION) {
+                bat_dbg(DBG_BATMAN, bat_priv,
+                        "Drop packet: incompatible batman version (%i)\n",
+                        batman_packet->version);
+                goto err_free;
+        }
+
+        /* all receive handlers return whether they received or reused
+         * the supplied skb. if not, we have to free the skb. */
+
+        switch (batman_packet->packet_type) {
+                /* batman originator packet */
+        case BAT_PACKET:
+                ret = recv_bat_packet(skb, batman_if);
+                break;
+
+                /* batman icmp packet */
+        case BAT_ICMP:
+                ret = recv_icmp_packet(skb, batman_if);
+                break;
+
+                /* unicast packet */
+        case BAT_UNICAST:
+                ret = recv_unicast_packet(skb, batman_if);
+                break;
+
+                /* fragmented unicast packet */
+        case BAT_UNICAST_FRAG:
+                ret = recv_ucast_frag_packet(skb, batman_if);
+                break;
+
+                /* broadcast packet */
+        case BAT_BCAST:
+                ret = recv_bcast_packet(skb, batman_if);
+                break;
+
+                /* vis packet */
+        case BAT_VIS:
+                ret = recv_vis_packet(skb, batman_if);
+                break;
+        default:
+                ret = NET_RX_DROP;
+        }
+
+        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;
+}
+
+struct notifier_block hard_if_notifier = {
+        .notifier_call = hard_if_event,
+};