/* 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 "main.h" #include "soft-interface.h" #include "hard-interface.h" #include "distributed-arp-table.h" #include "routing.h" #include "send.h" #include "debugfs.h" #include "translation-table.h" #include "hash.h" #include "gateway_common.h" #include "gateway_client.h" #include "sysfs.h" #include "originator.h" #include #include #include #include #include #include "unicast.h" #include "bridge_loop_avoidance.h" #include "network-coding.h" static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); static void batadv_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info); static u32 batadv_get_msglevel(struct net_device *dev); static void batadv_set_msglevel(struct net_device *dev, u32 value); static u32 batadv_get_link(struct net_device *dev); static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); static void batadv_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *stats, u64 *data); static int batadv_get_sset_count(struct net_device *dev, int stringset); static const struct ethtool_ops batadv_ethtool_ops = { .get_settings = batadv_get_settings, .get_drvinfo = batadv_get_drvinfo, .get_msglevel = batadv_get_msglevel, .set_msglevel = batadv_set_msglevel, .get_link = batadv_get_link, .get_strings = batadv_get_strings, .get_ethtool_stats = batadv_get_ethtool_stats, .get_sset_count = batadv_get_sset_count, }; int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) { int result; /* TODO: We must check if we can release all references to non-payload * data using skb_header_release in our skbs to allow skb_cow_header to * work optimally. This means that those skbs are not allowed to read * or write any data which is before the current position of skb->data * after that call and thus allow other skbs with the same data buffer * to write freely in that area. */ result = skb_cow_head(skb, len); if (result < 0) return result; skb_push(skb, len); return 0; } static int batadv_interface_open(struct net_device *dev) { netif_start_queue(dev); return 0; } static int batadv_interface_release(struct net_device *dev) { netif_stop_queue(dev); return 0; } static struct net_device_stats *batadv_interface_stats(struct net_device *dev) { struct batadv_priv *bat_priv = netdev_priv(dev); struct net_device_stats *stats = &bat_priv->stats; stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); return stats; } static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) { struct batadv_priv *bat_priv = netdev_priv(dev); struct sockaddr *addr = p; uint8_t old_addr[ETH_ALEN]; if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; memcpy(old_addr, dev->dev_addr, ETH_ALEN); memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); /* only modify transtable if it has been initialized before */ if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) { batadv_tt_local_remove(bat_priv, old_addr, "mac address changed", false); batadv_tt_local_add(dev, addr->sa_data, BATADV_NULL_IFINDEX); } return 0; } static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) { /* check ranges */ if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) return -EINVAL; dev->mtu = new_mtu; return 0; } static int batadv_interface_tx(struct sk_buff *skb, struct net_device *soft_iface) { struct ethhdr *ethhdr = (struct ethhdr *)skb->data; struct batadv_priv *bat_priv = netdev_priv(soft_iface); struct batadv_hard_iface *primary_if = NULL; struct batadv_bcast_packet *bcast_packet; struct vlan_ethhdr *vhdr; __be16 ethertype = __constant_htons(ETH_P_BATMAN); static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00, 0x00}; static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 0x00, 0x00}; unsigned int header_len = 0; int data_len = skb->len, ret; short vid __maybe_unused = -1; bool do_bcast = false; uint32_t seqno; unsigned long brd_delay = 1; if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) goto dropped; soft_iface->trans_start = jiffies; switch (ntohs(ethhdr->h_proto)) { case ETH_P_8021Q: vhdr = (struct vlan_ethhdr *)skb->data; vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; if (vhdr->h_vlan_encapsulated_proto != ethertype) break; /* fall through */ case ETH_P_BATMAN: goto dropped; } if (batadv_bla_tx(bat_priv, skb, vid)) goto dropped; /* Register the client MAC in the transtable */ if (!is_multicast_ether_addr(ethhdr->h_source)) batadv_tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif); /* don't accept stp packets. STP does not help in meshes. * better use the bridge loop avoidance ... * * The same goes for ECTP sent at least by some Cisco Switches, * it might confuse the mesh when used with bridge loop avoidance. */ if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) goto dropped; if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) goto dropped; if (is_multicast_ether_addr(ethhdr->h_dest)) { do_bcast = true; switch (atomic_read(&bat_priv->gw_mode)) { case BATADV_GW_MODE_SERVER: /* gateway servers should not send dhcp * requests into the mesh */ ret = batadv_gw_is_dhcp_target(skb, &header_len); if (ret) goto dropped; break; case BATADV_GW_MODE_CLIENT: /* gateway clients should send dhcp requests * via unicast to their gateway */ ret = batadv_gw_is_dhcp_target(skb, &header_len); if (ret) do_bcast = false; break; case BATADV_GW_MODE_OFF: default: break; } } /* ethernet packet should be broadcasted */ if (do_bcast) { primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto dropped; /* in case of ARP request, we do not immediately broadcasti the * packet, instead we first wait for DAT to try to retrieve the * correct ARP entry */ if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) goto dropped; bcast_packet = (struct batadv_bcast_packet *)skb->data; bcast_packet->header.version = BATADV_COMPAT_VERSION; bcast_packet->header.ttl = BATADV_TTL; /* batman packet type: broadcast */ bcast_packet->header.packet_type = BATADV_BCAST; bcast_packet->reserved = 0; /* hw address of first interface is the orig mac because only * this mac is known throughout the mesh */ memcpy(bcast_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); /* set broadcast sequence number */ seqno = atomic_inc_return(&bat_priv->bcast_seqno); bcast_packet->seqno = htonl(seqno); batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); /* a copy is stored in the bcast list, therefore removing * the original skb. */ kfree_skb(skb); /* unicast packet */ } else { if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) { ret = batadv_gw_out_of_range(bat_priv, skb, ethhdr); if (ret) goto dropped; } if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) goto dropped; batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); ret = batadv_unicast_send_skb(bat_priv, skb); if (ret != 0) goto dropped_freed; } batadv_inc_counter(bat_priv, BATADV_CNT_TX); batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); goto end; dropped: kfree_skb(skb); dropped_freed: batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); end: if (primary_if) batadv_hardif_free_ref(primary_if); return NETDEV_TX_OK; } void batadv_interface_rx(struct net_device *soft_iface, struct sk_buff *skb, struct batadv_hard_iface *recv_if, int hdr_size, struct batadv_orig_node *orig_node) { struct batadv_priv *bat_priv = netdev_priv(soft_iface); struct ethhdr *ethhdr; struct vlan_ethhdr *vhdr; struct batadv_header *batadv_header = (struct batadv_header *)skb->data; short vid __maybe_unused = -1; __be16 ethertype = __constant_htons(ETH_P_BATMAN); bool is_bcast; is_bcast = (batadv_header->packet_type == BATADV_BCAST); /* check if enough space is available for pulling, and pull */ if (!pskb_may_pull(skb, hdr_size)) goto dropped; skb_pull_rcsum(skb, hdr_size); skb_reset_mac_header(skb); ethhdr = (struct ethhdr *)skb_mac_header(skb); switch (ntohs(ethhdr->h_proto)) { case ETH_P_8021Q: vhdr = (struct vlan_ethhdr *)skb->data; vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; if (vhdr->h_vlan_encapsulated_proto != ethertype) break; /* fall through */ case ETH_P_BATMAN: goto dropped; } /* skb->dev & skb->pkt_type are set here */ if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) goto dropped; skb->protocol = eth_type_trans(skb, soft_iface); /* should not be necessary anymore as we use skb_pull_rcsum() * TODO: please verify this and remove this TODO * -- Dec 21st 2009, Simon Wunderlich */ /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ batadv_inc_counter(bat_priv, BATADV_CNT_RX); batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, skb->len + ETH_HLEN); soft_iface->last_rx = jiffies; /* Let the bridge loop avoidance check the packet. If will * not handle it, we can safely push it up. */ if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) goto out; if (orig_node) batadv_tt_add_temporary_global_entry(bat_priv, orig_node, ethhdr->h_source); if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest)) goto dropped; netif_rx(skb); goto out; dropped: kfree_skb(skb); out: return; } /* batman-adv network devices have devices nesting below it and are a special * "super class" of normal network devices; split their locks off into a * separate class since they always nest. */ static struct lock_class_key batadv_netdev_xmit_lock_key; static struct lock_class_key batadv_netdev_addr_lock_key; /** * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue * @dev: device which owns the tx queue * @txq: tx queue to modify * @_unused: always NULL */ static void batadv_set_lockdep_class_one(struct net_device *dev, struct netdev_queue *txq, void *_unused) { lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); } /** * batadv_set_lockdep_class - Set txq and addr_list lockdep class * @dev: network device to modify */ static void batadv_set_lockdep_class(struct net_device *dev) { lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); } /** * batadv_softif_destroy_finish - cleans up the remains of a softif * @work: work queue item * * Free the parts of the soft interface which can not be removed under * rtnl lock (to prevent deadlock situations). */ static void batadv_softif_destroy_finish(struct work_struct *work) { struct batadv_priv *bat_priv; struct net_device *soft_iface; bat_priv = container_of(work, struct batadv_priv, cleanup_work); soft_iface = bat_priv->soft_iface; batadv_sysfs_del_meshif(soft_iface); rtnl_lock(); unregister_netdevice(soft_iface); rtnl_unlock(); } /** * batadv_softif_init_late - late stage initialization of soft interface * @dev: registered network device to modify * * Returns error code on failures */ static int batadv_softif_init_late(struct net_device *dev) { struct batadv_priv *bat_priv; int ret; size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM; batadv_set_lockdep_class(dev); bat_priv = netdev_priv(dev); bat_priv->soft_iface = dev; INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); /* batadv_interface_stats() needs to be available as soon as * register_netdevice() has been called */ bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t)); if (!bat_priv->bat_counters) return -ENOMEM; atomic_set(&bat_priv->aggregated_ogms, 1); atomic_set(&bat_priv->bonding, 0); #ifdef CONFIG_BATMAN_ADV_BLA atomic_set(&bat_priv->bridge_loop_avoidance, 0); #endif #ifdef CONFIG_BATMAN_ADV_DAT atomic_set(&bat_priv->distributed_arp_table, 1); #endif atomic_set(&bat_priv->ap_isolation, 0); atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE); atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF); atomic_set(&bat_priv->gw_sel_class, 20); atomic_set(&bat_priv->gw_bandwidth, 41); atomic_set(&bat_priv->orig_interval, 1000); atomic_set(&bat_priv->hop_penalty, 30); #ifdef CONFIG_BATMAN_ADV_DEBUG atomic_set(&bat_priv->log_level, 0); #endif atomic_set(&bat_priv->fragmentation, 1); atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); atomic_set(&bat_priv->bcast_seqno, 1); atomic_set(&bat_priv->tt.vn, 0); atomic_set(&bat_priv->tt.local_changes, 0); atomic_set(&bat_priv->tt.ogm_append_cnt, 0); #ifdef CONFIG_BATMAN_ADV_BLA atomic_set(&bat_priv->bla.num_requests, 0); #endif bat_priv->tt.last_changeset = NULL; bat_priv->tt.last_changeset_len = 0; bat_priv->primary_if = NULL; bat_priv->num_ifaces = 0; batadv_nc_init_bat_priv(bat_priv); ret = batadv_algo_select(bat_priv, batadv_routing_algo); if (ret < 0) goto free_bat_counters; ret = batadv_debugfs_add_meshif(dev); if (ret < 0) goto free_bat_counters; ret = batadv_mesh_init(dev); if (ret < 0) goto unreg_debugfs; return 0; unreg_debugfs: batadv_debugfs_del_meshif(dev); free_bat_counters: free_percpu(bat_priv->bat_counters); return ret; } static const struct net_device_ops batadv_netdev_ops = { .ndo_init = batadv_softif_init_late, .ndo_open = batadv_interface_open, .ndo_stop = batadv_interface_release, .ndo_get_stats = batadv_interface_stats, .ndo_set_mac_address = batadv_interface_set_mac_addr, .ndo_change_mtu = batadv_interface_change_mtu, .ndo_start_xmit = batadv_interface_tx, .ndo_validate_addr = eth_validate_addr }; /** * batadv_softif_free - Deconstructor of batadv_soft_interface * @dev: Device to cleanup and remove */ static void batadv_softif_free(struct net_device *dev) { batadv_debugfs_del_meshif(dev); batadv_mesh_free(dev); free_netdev(dev); } /** * batadv_softif_init_early - early stage initialization of soft interface * @dev: registered network device to modify */ static void batadv_softif_init_early(struct net_device *dev) { struct batadv_priv *priv = netdev_priv(dev); ether_setup(dev); dev->netdev_ops = &batadv_netdev_ops; dev->destructor = batadv_softif_free; dev->tx_queue_len = 0; /* can't call min_mtu, because the needed variables * have not been initialized yet */ dev->mtu = ETH_DATA_LEN; /* reserve more space in the skbuff for our header */ dev->hard_header_len = BATADV_HEADER_LEN; /* generate random address */ eth_hw_addr_random(dev); SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops); memset(priv, 0, sizeof(*priv)); } struct net_device *batadv_softif_create(const char *name) { struct net_device *soft_iface; int ret; soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, batadv_softif_init_early); if (!soft_iface) return NULL; ret = register_netdevice(soft_iface); if (ret < 0) { pr_err("Unable to register the batman interface '%s': %i\n", name, ret); free_netdev(soft_iface); return NULL; } return soft_iface; } /** * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs * @soft_iface: the to-be-removed batman-adv interface */ void batadv_softif_destroy_sysfs(struct net_device *soft_iface) { struct batadv_priv *bat_priv = netdev_priv(soft_iface); queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); } int batadv_softif_is_valid(const struct net_device *net_dev) { if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) return 1; return 0; } /* ethtool */ static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { cmd->supported = 0; cmd->advertising = 0; ethtool_cmd_speed_set(cmd, SPEED_10); cmd->duplex = DUPLEX_FULL; cmd->port = PORT_TP; cmd->phy_address = 0; cmd->transceiver = XCVR_INTERNAL; cmd->autoneg = AUTONEG_DISABLE; cmd->maxtxpkt = 0; cmd->maxrxpkt = 0; return 0; } static void batadv_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) { strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); } static u32 batadv_get_msglevel(struct net_device *dev) { return -EOPNOTSUPP; } static void batadv_set_msglevel(struct net_device *dev, u32 value) { } static u32 batadv_get_link(struct net_device *dev) { return 1; } /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 * Declare each description string in struct.name[] to get fixed sized buffer * and compile time checking for strings longer than ETH_GSTRING_LEN. */ static const struct { const char name[ETH_GSTRING_LEN]; } batadv_counters_strings[] = { { "tx" }, { "tx_bytes" }, { "tx_dropped" }, { "rx" }, { "rx_bytes" }, { "forward" }, { "forward_bytes" }, { "mgmt_tx" }, { "mgmt_tx_bytes" }, { "mgmt_rx" }, { "mgmt_rx_bytes" }, { "tt_request_tx" }, { "tt_request_rx" }, { "tt_response_tx" }, { "tt_response_rx" }, { "tt_roam_adv_tx" }, { "tt_roam_adv_rx" }, #ifdef CONFIG_BATMAN_ADV_DAT { "dat_get_tx" }, { "dat_get_rx" }, { "dat_put_tx" }, { "dat_put_rx" }, { "dat_cached_reply_tx" }, #endif #ifdef CONFIG_BATMAN_ADV_NC { "nc_code" }, { "nc_code_bytes" }, { "nc_recode" }, { "nc_recode_bytes" }, { "nc_buffer" }, { "nc_decode" }, { "nc_decode_bytes" }, { "nc_decode_failed" }, { "nc_sniffed" }, #endif }; static void batadv_get_strings(struct net_device *dev, uint32_t stringset, uint8_t *data) { if (stringset == ETH_SS_STATS) memcpy(data, batadv_counters_strings, sizeof(batadv_counters_strings)); } static void batadv_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *stats, uint64_t *data) { struct batadv_priv *bat_priv = netdev_priv(dev); int i; for (i = 0; i < BATADV_CNT_NUM; i++) data[i] = batadv_sum_counter(bat_priv, i); } static int batadv_get_sset_count(struct net_device *dev, int stringset) { if (stringset == ETH_SS_STATS) return BATADV_CNT_NUM; return -EOPNOTSUPP; }