| /* |
| * Copyright (C) 2007-2011 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> |
| |
| |
| static int batman_skb_recv(struct sk_buff *skb, |
| struct net_device *dev, |
| struct packet_type *ptype, |
| struct net_device *orig_dev); |
| |
| void hardif_free_rcu(struct rcu_head *rcu) |
| { |
| struct hard_iface *hard_iface; |
| |
| hard_iface = container_of(rcu, struct hard_iface, rcu); |
| dev_put(hard_iface->net_dev); |
| kfree(hard_iface); |
| } |
| |
| struct hard_iface *hardif_get_by_netdev(const struct net_device *net_dev) |
| { |
| struct hard_iface *hard_iface; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
| if (hard_iface->net_dev == net_dev && |
| atomic_inc_not_zero(&hard_iface->refcount)) |
| goto out; |
| } |
| |
| hard_iface = NULL; |
| |
| out: |
| rcu_read_unlock(); |
| return hard_iface; |
| } |
| |
| static int is_valid_iface(const 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 */ |
| if (softif_is_valid(net_dev)) |
| return 0; |
| |
| /* Device is being bridged */ |
| /* if (net_dev->priv_flags & IFF_BRIDGE_PORT) |
| return 0; */ |
| |
| return 1; |
| } |
| |
| static struct hard_iface *hardif_get_active(const struct net_device *soft_iface) |
| { |
| struct hard_iface *hard_iface; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
| if (hard_iface->soft_iface != soft_iface) |
| continue; |
| |
| if (hard_iface->if_status == IF_ACTIVE && |
| atomic_inc_not_zero(&hard_iface->refcount)) |
| goto out; |
| } |
| |
| hard_iface = NULL; |
| |
| out: |
| rcu_read_unlock(); |
| return hard_iface; |
| } |
| |
| static void primary_if_update_addr(struct bat_priv *bat_priv) |
| { |
| struct vis_packet *vis_packet; |
| struct hard_iface *primary_if; |
| |
| primary_if = primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| goto out; |
| |
| vis_packet = (struct vis_packet *) |
| bat_priv->my_vis_info->skb_packet->data; |
| memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
| memcpy(vis_packet->sender_orig, |
| primary_if->net_dev->dev_addr, ETH_ALEN); |
| |
| out: |
| if (primary_if) |
| hardif_free_ref(primary_if); |
| } |
| |
| static void primary_if_select(struct bat_priv *bat_priv, |
| struct hard_iface *new_hard_iface) |
| { |
| struct hard_iface *curr_hard_iface; |
| struct batman_packet *batman_packet; |
| |
| ASSERT_RTNL(); |
| |
| if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
| new_hard_iface = NULL; |
| |
| curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
| rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
| |
| if (curr_hard_iface) |
| hardif_free_ref(curr_hard_iface); |
| |
| if (!new_hard_iface) |
| return; |
| |
| batman_packet = (struct batman_packet *)(new_hard_iface->packet_buff); |
| batman_packet->flags = PRIMARIES_FIRST_HOP; |
| batman_packet->ttl = TTL; |
| |
| primary_if_update_addr(bat_priv); |
| |
| /*** |
| * hacky trick to make sure that we send the TT information via |
| * our new primary interface |
| */ |
| atomic_set(&bat_priv->tt_local_changed, 1); |
| } |
| |
| static bool hardif_is_iface_up(const struct hard_iface *hard_iface) |
| { |
| if (hard_iface->net_dev->flags & IFF_UP) |
| return true; |
| |
| return false; |
| } |
| |
| static void update_mac_addresses(struct hard_iface *hard_iface) |
| { |
| memcpy(((struct batman_packet *)(hard_iface->packet_buff))->orig, |
| hard_iface->net_dev->dev_addr, ETH_ALEN); |
| memcpy(((struct batman_packet *)(hard_iface->packet_buff))->prev_sender, |
| hard_iface->net_dev->dev_addr, ETH_ALEN); |
| } |
| |
| static void check_known_mac_addr(const struct net_device *net_dev) |
| { |
| const struct hard_iface *hard_iface; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
| if ((hard_iface->if_status != IF_ACTIVE) && |
| (hard_iface->if_status != IF_TO_BE_ACTIVATED)) |
| continue; |
| |
| if (hard_iface->net_dev == net_dev) |
| continue; |
| |
| if (!compare_eth(hard_iface->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, |
| hard_iface->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) |
| { |
| const struct bat_priv *bat_priv = netdev_priv(soft_iface); |
| const struct hard_iface *hard_iface; |
| /* 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(hard_iface, &hardif_list, list) { |
| if ((hard_iface->if_status != IF_ACTIVE) && |
| (hard_iface->if_status != IF_TO_BE_ACTIVATED)) |
| continue; |
| |
| if (hard_iface->soft_iface != soft_iface) |
| continue; |
| |
| min_mtu = min_t(int, hard_iface->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 hard_iface *hard_iface) |
| { |
| struct bat_priv *bat_priv; |
| struct hard_iface *primary_if = NULL; |
| |
| if (hard_iface->if_status != IF_INACTIVE) |
| goto out; |
| |
| bat_priv = netdev_priv(hard_iface->soft_iface); |
| |
| update_mac_addresses(hard_iface); |
| hard_iface->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 |
| */ |
| primary_if = primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| primary_if_select(bat_priv, hard_iface); |
| |
| bat_info(hard_iface->soft_iface, "Interface activated: %s\n", |
| hard_iface->net_dev->name); |
| |
| update_min_mtu(hard_iface->soft_iface); |
| |
| out: |
| if (primary_if) |
| hardif_free_ref(primary_if); |
| } |
| |
| static void hardif_deactivate_interface(struct hard_iface *hard_iface) |
| { |
| if ((hard_iface->if_status != IF_ACTIVE) && |
| (hard_iface->if_status != IF_TO_BE_ACTIVATED)) |
| return; |
| |
| hard_iface->if_status = IF_INACTIVE; |
| |
| bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
| hard_iface->net_dev->name); |
| |
| update_min_mtu(hard_iface->soft_iface); |
| } |
| |
| int hardif_enable_interface(struct hard_iface *hard_iface, |
| const char *iface_name) |
| { |
| struct bat_priv *bat_priv; |
| struct batman_packet *batman_packet; |
| struct net_device *soft_iface; |
| int ret; |
| |
| if (hard_iface->if_status != IF_NOT_IN_USE) |
| goto out; |
| |
| if (!atomic_inc_not_zero(&hard_iface->refcount)) |
| goto out; |
| |
| soft_iface = dev_get_by_name(&init_net, iface_name); |
| |
| if (!soft_iface) { |
| soft_iface = softif_create(iface_name); |
| |
| if (!soft_iface) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| /* dev_get_by_name() increases the reference counter for us */ |
| dev_hold(soft_iface); |
| } |
| |
| if (!softif_is_valid(soft_iface)) { |
| pr_err("Can't create batman mesh interface %s: " |
| "already exists as regular interface\n", |
| soft_iface->name); |
| dev_put(soft_iface); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| hard_iface->soft_iface = soft_iface; |
| bat_priv = netdev_priv(hard_iface->soft_iface); |
| hard_iface->packet_len = BAT_PACKET_LEN; |
| hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC); |
| |
| if (!hard_iface->packet_buff) { |
| bat_err(hard_iface->soft_iface, "Can't add interface packet " |
| "(%s): out of memory\n", hard_iface->net_dev->name); |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| batman_packet = (struct batman_packet *)(hard_iface->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_tt = 0; |
| |
| hard_iface->if_num = bat_priv->num_ifaces; |
| bat_priv->num_ifaces++; |
| hard_iface->if_status = IF_INACTIVE; |
| orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
| |
| hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN); |
| hard_iface->batman_adv_ptype.func = batman_skb_recv; |
| hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
| dev_add_pack(&hard_iface->batman_adv_ptype); |
| |
| atomic_set(&hard_iface->seqno, 1); |
| atomic_set(&hard_iface->frag_seqno, 1); |
| bat_info(hard_iface->soft_iface, "Adding interface: %s\n", |
| hard_iface->net_dev->name); |
| |
| if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu < |
| ETH_DATA_LEN + BAT_HEADER_LEN) |
| bat_info(hard_iface->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", |
| hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
| ETH_DATA_LEN + BAT_HEADER_LEN); |
| |
| if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu < |
| ETH_DATA_LEN + BAT_HEADER_LEN) |
| bat_info(hard_iface->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", |
| hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
| ETH_DATA_LEN + BAT_HEADER_LEN); |
| |
| if (hardif_is_iface_up(hard_iface)) |
| hardif_activate_interface(hard_iface); |
| else |
| bat_err(hard_iface->soft_iface, "Not using interface %s " |
| "(retrying later): interface not active\n", |
| hard_iface->net_dev->name); |
| |
| /* begin scheduling originator messages on that interface */ |
| schedule_own_packet(hard_iface); |
| |
| out: |
| return 0; |
| |
| err: |
| hardif_free_ref(hard_iface); |
| return ret; |
| } |
| |
| void hardif_disable_interface(struct hard_iface *hard_iface) |
| { |
| struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| struct hard_iface *primary_if = NULL; |
| |
| if (hard_iface->if_status == IF_ACTIVE) |
| hardif_deactivate_interface(hard_iface); |
| |
| if (hard_iface->if_status != IF_INACTIVE) |
| goto out; |
| |
| bat_info(hard_iface->soft_iface, "Removing interface: %s\n", |
| hard_iface->net_dev->name); |
| dev_remove_pack(&hard_iface->batman_adv_ptype); |
| |
| bat_priv->num_ifaces--; |
| orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
| |
| primary_if = primary_if_get_selected(bat_priv); |
| if (hard_iface == primary_if) { |
| struct hard_iface *new_if; |
| |
| new_if = hardif_get_active(hard_iface->soft_iface); |
| primary_if_select(bat_priv, new_if); |
| |
| if (new_if) |
| hardif_free_ref(new_if); |
| } |
| |
| kfree(hard_iface->packet_buff); |
| hard_iface->packet_buff = NULL; |
| hard_iface->if_status = IF_NOT_IN_USE; |
| |
| /* delete all references to this hard_iface */ |
| purge_orig_ref(bat_priv); |
| purge_outstanding_packets(bat_priv, hard_iface); |
| dev_put(hard_iface->soft_iface); |
| |
| /* nobody uses this interface anymore */ |
| if (!bat_priv->num_ifaces) |
| softif_destroy(hard_iface->soft_iface); |
| |
| hard_iface->soft_iface = NULL; |
| hardif_free_ref(hard_iface); |
| |
| out: |
| if (primary_if) |
| hardif_free_ref(primary_if); |
| } |
| |
| static struct hard_iface *hardif_add_interface(struct net_device *net_dev) |
| { |
| struct hard_iface *hard_iface; |
| int ret; |
| |
| ASSERT_RTNL(); |
| |
| ret = is_valid_iface(net_dev); |
| if (ret != 1) |
| goto out; |
| |
| dev_hold(net_dev); |
| |
| hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); |
| if (!hard_iface) { |
| pr_err("Can't add interface (%s): out of memory\n", |
| net_dev->name); |
| goto release_dev; |
| } |
| |
| ret = sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
| if (ret) |
| goto free_if; |
| |
| hard_iface->if_num = -1; |
| hard_iface->net_dev = net_dev; |
| hard_iface->soft_iface = NULL; |
| hard_iface->if_status = IF_NOT_IN_USE; |
| INIT_LIST_HEAD(&hard_iface->list); |
| /* extra reference for return */ |
| atomic_set(&hard_iface->refcount, 2); |
| |
| check_known_mac_addr(hard_iface->net_dev); |
| list_add_tail_rcu(&hard_iface->list, &hardif_list); |
| |
| return hard_iface; |
| |
| free_if: |
| kfree(hard_iface); |
| release_dev: |
| dev_put(net_dev); |
| out: |
| return NULL; |
| } |
| |
| static void hardif_remove_interface(struct hard_iface *hard_iface) |
| { |
| ASSERT_RTNL(); |
| |
| /* first deactivate interface */ |
| if (hard_iface->if_status != IF_NOT_IN_USE) |
| hardif_disable_interface(hard_iface); |
| |
| if (hard_iface->if_status != IF_NOT_IN_USE) |
| return; |
| |
| hard_iface->if_status = IF_TO_BE_REMOVED; |
| sysfs_del_hardif(&hard_iface->hardif_obj); |
| hardif_free_ref(hard_iface); |
| } |
| |
| void hardif_remove_interfaces(void) |
| { |
| struct hard_iface *hard_iface, *hard_iface_tmp; |
| |
| rtnl_lock(); |
| list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
| &hardif_list, list) { |
| list_del_rcu(&hard_iface->list); |
| hardif_remove_interface(hard_iface); |
| } |
| rtnl_unlock(); |
| } |
| |
| static int hard_if_event(struct notifier_block *this, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *net_dev = ptr; |
| struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev); |
| struct hard_iface *primary_if = NULL; |
| struct bat_priv *bat_priv; |
| |
| if (!hard_iface && event == NETDEV_REGISTER) |
| hard_iface = hardif_add_interface(net_dev); |
| |
| if (!hard_iface) |
| goto out; |
| |
| switch (event) { |
| case NETDEV_UP: |
| hardif_activate_interface(hard_iface); |
| break; |
| case NETDEV_GOING_DOWN: |
| case NETDEV_DOWN: |
| hardif_deactivate_interface(hard_iface); |
| break; |
| case NETDEV_UNREGISTER: |
| list_del_rcu(&hard_iface->list); |
| |
| hardif_remove_interface(hard_iface); |
| break; |
| case NETDEV_CHANGEMTU: |
| if (hard_iface->soft_iface) |
| update_min_mtu(hard_iface->soft_iface); |
| break; |
| case NETDEV_CHANGEADDR: |
| if (hard_iface->if_status == IF_NOT_IN_USE) |
| goto hardif_put; |
| |
| check_known_mac_addr(hard_iface->net_dev); |
| update_mac_addresses(hard_iface); |
| |
| bat_priv = netdev_priv(hard_iface->soft_iface); |
| primary_if = primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| goto hardif_put; |
| |
| if (hard_iface == primary_if) |
| primary_if_update_addr(bat_priv); |
| break; |
| default: |
| break; |
| }; |
| |
| hardif_put: |
| hardif_free_ref(hard_iface); |
| out: |
| if (primary_if) |
| hardif_free_ref(primary_if); |
| return NOTIFY_DONE; |
| } |
| |
| /* receive a packet with the batman ethertype coming on a hard |
| * interface */ |
| static 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 hard_iface *hard_iface; |
| int ret; |
| |
| hard_iface = container_of(ptype, struct 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 != sizeof(struct ethhdr) |
| || !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) != MESH_ACTIVE) |
| goto err_free; |
| |
| /* discard frames on not active interfaces */ |
| if (hard_iface->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, hard_iface); |
| break; |
| |
| /* batman icmp packet */ |
| case BAT_ICMP: |
| ret = recv_icmp_packet(skb, hard_iface); |
| break; |
| |
| /* unicast packet */ |
| case BAT_UNICAST: |
| ret = recv_unicast_packet(skb, hard_iface); |
| break; |
| |
| /* fragmented unicast packet */ |
| case BAT_UNICAST_FRAG: |
| ret = recv_ucast_frag_packet(skb, hard_iface); |
| break; |
| |
| /* broadcast packet */ |
| case BAT_BCAST: |
| ret = recv_bcast_packet(skb, hard_iface); |
| break; |
| |
| /* vis packet */ |
| case BAT_VIS: |
| ret = recv_vis_packet(skb, hard_iface); |
| 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, |
| }; |