| /* |
| * 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> |
| #include <linux/netfilter_bridge.h> |
| |
| #define MIN(x, y) ((x) < (y) ? (x) : (y)) |
| |
| 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: |
| 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(void) |
| { |
| struct batman_if *batman_if; |
| |
| /* TODO: should check interfaces belonging to bat_priv */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(batman_if, &if_list, list) { |
| if (batman_if->if_status == IF_ACTIVE) |
| goto out; |
| } |
| |
| batman_if = NULL; |
| |
| out: |
| rcu_read_unlock(); |
| return batman_if; |
| } |
| |
| static void set_primary_if(struct bat_priv *bat_priv, |
| struct batman_if *batman_if) |
| { |
| struct batman_packet *batman_packet; |
| |
| bat_priv->primary_if = batman_if; |
| |
| if (!bat_priv->primary_if) |
| return; |
| |
| set_main_if_addr(batman_if->net_dev->dev_addr); |
| |
| batman_packet = (struct batman_packet *)(batman_if->packet_buff); |
| batman_packet->flags = PRIMARIES_FIRST_HOP; |
| batman_packet->ttl = TTL; |
| |
| /*** |
| * hacky trick to make sure that we send the HNA information via |
| * our new primary interface |
| */ |
| atomic_set(&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) |
| { |
| addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr); |
| |
| 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(uint8_t *addr) |
| { |
| 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 (!compare_orig(batman_if->net_dev->dev_addr, addr)) |
| continue; |
| |
| pr_warning("The newly added mac address (%pM) already exists " |
| "on: %s\n", addr, batman_if->dev); |
| pr_warning("It is strongly recommended to keep mac addresses " |
| "unique to avoid problems!\n"); |
| } |
| rcu_read_unlock(); |
| } |
| |
| int hardif_min_mtu(void) |
| { |
| 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; |
| |
| 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)) |
| min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN, |
| min_mtu); |
| } |
| rcu_read_unlock(); |
| |
| return min_mtu; |
| } |
| |
| /* adjusts the MTU if a new interface with a smaller MTU appeared. */ |
| void update_min_mtu(void) |
| { |
| int min_mtu; |
| |
| min_mtu = hardif_min_mtu(); |
| if (soft_device->mtu != min_mtu) |
| soft_device->mtu = min_mtu; |
| } |
| |
| static void hardif_activate_interface(struct net_device *net_dev, |
| struct bat_priv *bat_priv, |
| struct batman_if *batman_if) |
| { |
| if (batman_if->if_status != IF_INACTIVE) |
| return; |
| |
| dev_hold(batman_if->net_dev); |
| |
| 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(net_dev, "Interface activated: %s\n", batman_if->dev); |
| |
| if (atomic_read(&module_state) == MODULE_INACTIVE) |
| activate_module(); |
| |
| update_min_mtu(); |
| return; |
| } |
| |
| static void hardif_deactivate_interface(struct net_device *net_dev, |
| struct batman_if *batman_if) |
| { |
| if ((batman_if->if_status != IF_ACTIVE) && |
| (batman_if->if_status != IF_TO_BE_ACTIVATED)) |
| return; |
| |
| dev_put(batman_if->net_dev); |
| |
| batman_if->if_status = IF_INACTIVE; |
| |
| bat_info(net_dev, "Interface deactivated: %s\n", batman_if->dev); |
| |
| update_min_mtu(); |
| } |
| |
| int hardif_enable_interface(struct batman_if *batman_if) |
| { |
| /* FIXME: each batman_if will be attached to a softif */ |
| struct bat_priv *bat_priv = netdev_priv(soft_device); |
| struct batman_packet *batman_packet; |
| |
| if (batman_if->if_status != IF_NOT_IN_USE) |
| goto out; |
| |
| 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(soft_device, "Can't add interface packet (%s): " |
| "out of memory\n", batman_if->dev); |
| 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); |
| |
| atomic_set(&batman_if->seqno, 1); |
| bat_info(soft_device, "Adding interface: %s\n", batman_if->dev); |
| |
| if (hardif_is_iface_up(batman_if)) |
| hardif_activate_interface(soft_device, bat_priv, batman_if); |
| else |
| bat_err(soft_device, "Not using interface %s " |
| "(retrying later): interface not active\n", |
| batman_if->dev); |
| |
| /* 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) |
| { |
| /* FIXME: each batman_if will be attached to a softif */ |
| struct bat_priv *bat_priv = netdev_priv(soft_device); |
| |
| if (batman_if->if_status == IF_ACTIVE) |
| hardif_deactivate_interface(soft_device, batman_if); |
| |
| if (batman_if->if_status != IF_INACTIVE) |
| return; |
| |
| bat_info(soft_device, "Removing interface: %s\n", batman_if->dev); |
| bat_priv->num_ifaces--; |
| orig_hash_del_if(batman_if, bat_priv->num_ifaces); |
| |
| if (batman_if == bat_priv->primary_if) |
| set_primary_if(bat_priv, get_active_batman_if()); |
| |
| kfree(batman_if->packet_buff); |
| batman_if->packet_buff = NULL; |
| batman_if->if_status = IF_NOT_IN_USE; |
| |
| if ((atomic_read(&module_state) == MODULE_ACTIVE) && |
| (bat_priv->num_ifaces == 0)) |
| deactivate_module(); |
| } |
| |
| 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; |
| |
| 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 out; |
| } |
| |
| batman_if->dev = kstrdup(net_dev->name, GFP_ATOMIC); |
| if (!batman_if->dev) |
| goto free_if; |
| |
| ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev); |
| if (ret) |
| goto free_dev; |
| |
| batman_if->if_num = -1; |
| batman_if->net_dev = net_dev; |
| batman_if->if_status = IF_NOT_IN_USE; |
| INIT_LIST_HEAD(&batman_if->list); |
| |
| check_known_mac_addr(batman_if->net_dev->dev_addr); |
| list_add_tail_rcu(&batman_if->list, &if_list); |
| return batman_if; |
| |
| free_dev: |
| kfree(batman_if->dev); |
| free_if: |
| kfree(batman_if); |
| out: |
| return NULL; |
| } |
| |
| static void hardif_free_interface(struct rcu_head *rcu) |
| { |
| struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu); |
| |
| /* delete all references to this batman_if */ |
| purge_orig(NULL); |
| purge_outstanding_packets(batman_if); |
| |
| kfree(batman_if->dev); |
| kfree(batman_if); |
| } |
| |
| 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; |
| list_del_rcu(&batman_if->list); |
| sysfs_del_hardif(&batman_if->hardif_obj); |
| call_rcu(&batman_if->rcu, hardif_free_interface); |
| } |
| |
| void hardif_remove_interfaces(void) |
| { |
| struct batman_if *batman_if, *batman_if_tmp; |
| |
| list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list) |
| hardif_remove_interface(batman_if); |
| } |
| |
| 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); |
| /* FIXME: each batman_if will be attached to a softif */ |
| struct bat_priv *bat_priv = netdev_priv(soft_device); |
| |
| if (!batman_if) |
| batman_if = hardif_add_interface(net_dev); |
| |
| if (!batman_if) |
| goto out; |
| |
| switch (event) { |
| case NETDEV_REGISTER: |
| break; |
| case NETDEV_UP: |
| hardif_activate_interface(soft_device, bat_priv, batman_if); |
| break; |
| case NETDEV_GOING_DOWN: |
| case NETDEV_DOWN: |
| hardif_deactivate_interface(soft_device, batman_if); |
| break; |
| case NETDEV_UNREGISTER: |
| hardif_remove_interface(batman_if); |
| break; |
| case NETDEV_CHANGENAME: |
| break; |
| case NETDEV_CHANGEADDR: |
| check_known_mac_addr(batman_if->net_dev->dev_addr); |
| update_mac_addresses(batman_if); |
| if (batman_if == bat_priv->primary_if) |
| set_primary_if(bat_priv, batman_if); |
| break; |
| default: |
| break; |
| }; |
| |
| out: |
| return NOTIFY_DONE; |
| } |
| |
| static int batman_skb_recv_finish(struct sk_buff *skb) |
| { |
| return NF_ACCEPT; |
| } |
| |
| /* 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) |
| { |
| /* FIXME: each orig_node->batman_if will be attached to a softif */ |
| struct bat_priv *bat_priv = netdev_priv(soft_device); |
| struct batman_packet *batman_packet; |
| struct batman_if *batman_if; |
| struct net_device_stats *stats; |
| struct rtnl_link_stats64 temp; |
| int ret; |
| |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| |
| /* skb was released by skb_share_check() */ |
| if (!skb) |
| goto err_out; |
| |
| if (atomic_read(&module_state) != MODULE_ACTIVE) |
| goto err_free; |
| |
| /* if netfilter/ebtables wants to block incoming batman |
| * packets then give them a chance to do so here */ |
| ret = NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, dev, NULL, |
| batman_skb_recv_finish); |
| if (ret != 1) |
| goto err_out; |
| |
| /* packet should hold at least type and version */ |
| if (unlikely(skb_headlen(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; |
| |
| batman_if = get_batman_if_by_netdev(skb->dev); |
| if (!batman_if) |
| goto err_free; |
| |
| /* discard frames on not active interfaces */ |
| if (batman_if->if_status != IF_ACTIVE) |
| goto err_free; |
| |
| stats = (struct net_device_stats *)dev_get_stats(skb->dev, &temp); |
| if (stats) { |
| stats->rx_packets++; |
| stats->rx_bytes += skb->len; |
| } |
| |
| 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); |
| break; |
| |
| /* unicast packet */ |
| case BAT_UNICAST: |
| ret = recv_unicast_packet(skb, batman_if); |
| break; |
| |
| /* broadcast packet */ |
| case BAT_BCAST: |
| ret = recv_bcast_packet(skb); |
| break; |
| |
| /* vis packet */ |
| case BAT_VIS: |
| ret = recv_vis_packet(skb); |
| 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, |
| }; |