diff options
Diffstat (limited to 'net/batman-adv')
| -rw-r--r-- | net/batman-adv/Kconfig | 14 | ||||
| -rw-r--r-- | net/batman-adv/Makefile | 3 | ||||
| -rw-r--r-- | net/batman-adv/bat_iv_ogm.c | 5 | ||||
| -rw-r--r-- | net/batman-adv/debugfs.c | 18 | ||||
| -rw-r--r-- | net/batman-adv/distributed-arp-table.c | 22 | ||||
| -rw-r--r-- | net/batman-adv/gateway_client.c | 2 | ||||
| -rw-r--r-- | net/batman-adv/hard-interface.c | 66 | ||||
| -rw-r--r-- | net/batman-adv/hard-interface.h | 13 | ||||
| -rw-r--r-- | net/batman-adv/main.c | 10 | ||||
| -rw-r--r-- | net/batman-adv/main.h | 15 | ||||
| -rw-r--r-- | net/batman-adv/network-coding.c | 1821 | ||||
| -rw-r--r-- | net/batman-adv/network-coding.h | 123 | ||||
| -rw-r--r-- | net/batman-adv/originator.c | 10 | ||||
| -rw-r--r-- | net/batman-adv/packet.h | 33 | ||||
| -rw-r--r-- | net/batman-adv/routing.c | 49 | ||||
| -rw-r--r-- | net/batman-adv/send.c | 5 | ||||
| -rw-r--r-- | net/batman-adv/soft-interface.c | 281 | ||||
| -rw-r--r-- | net/batman-adv/soft-interface.h | 3 | ||||
| -rw-r--r-- | net/batman-adv/sysfs.c | 22 | ||||
| -rw-r--r-- | net/batman-adv/translation-table.c | 29 | ||||
| -rw-r--r-- | net/batman-adv/types.h | 136 | ||||
| -rw-r--r-- | net/batman-adv/unicast.c | 6 | ||||
| -rw-r--r-- | net/batman-adv/vis.c | 4 |
23 files changed, 2512 insertions, 178 deletions
diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig index 8d8afb134b3a..fa780b76630e 100644 --- a/net/batman-adv/Kconfig +++ b/net/batman-adv/Kconfig @@ -36,6 +36,20 @@ config BATMAN_ADV_DAT mesh networks. If you think that your network does not need this option you can safely remove it and save some space. +config BATMAN_ADV_NC + bool "Network Coding" + depends on BATMAN_ADV + default n + help + This option enables network coding, a mechanism that aims to + increase the overall network throughput by fusing multiple + packets in one transmission. + Note that interfaces controlled by batman-adv must be manually + configured to have promiscuous mode enabled in order to make + network coding work. + If you think that your network does not need this feature you + can safely disable it and save some space. + config BATMAN_ADV_DEBUG bool "B.A.T.M.A.N. debugging" depends on BATMAN_ADV diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile index e45e3b4e32e3..acbac2a9c62f 100644 --- a/net/batman-adv/Makefile +++ b/net/batman-adv/Makefile @@ -1,5 +1,5 @@ # -# Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: +# Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: # # Marek Lindner, Simon Wunderlich # @@ -30,6 +30,7 @@ batman-adv-y += hard-interface.o batman-adv-y += hash.o batman-adv-y += icmp_socket.o batman-adv-y += main.o +batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o batman-adv-y += originator.o batman-adv-y += ring_buffer.o batman-adv-y += routing.o diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index a5bb0a769eb9..071f288b77a8 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -27,6 +27,7 @@ #include "hard-interface.h" #include "send.h" #include "bat_algo.h" +#include "network-coding.h" static struct batadv_neigh_node * batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, @@ -1185,6 +1186,10 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, if (!orig_neigh_node) goto out; + /* Update nc_nodes of the originator */ + batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, + batadv_ogm_packet, is_single_hop_neigh); + orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); /* drop packet if sender is not a direct neighbor and if we diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c index 6ae86516db4d..f186a55b23c3 100644 --- a/net/batman-adv/debugfs.c +++ b/net/batman-adv/debugfs.c @@ -32,6 +32,7 @@ #include "icmp_socket.h" #include "bridge_loop_avoidance.h" #include "distributed-arp-table.h" +#include "network-coding.h" static struct dentry *batadv_debugfs; @@ -310,6 +311,14 @@ struct batadv_debuginfo { const struct file_operations fops; }; +#ifdef CONFIG_BATMAN_ADV_NC +static int batadv_nc_nodes_open(struct inode *inode, struct file *file) +{ + struct net_device *net_dev = (struct net_device *)inode->i_private; + return single_open(file, batadv_nc_nodes_seq_print_text, net_dev); +} +#endif + #define BATADV_DEBUGINFO(_name, _mode, _open) \ struct batadv_debuginfo batadv_debuginfo_##_name = { \ .attr = { .name = __stringify(_name), \ @@ -348,6 +357,9 @@ static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open); static BATADV_DEBUGINFO(transtable_local, S_IRUGO, batadv_transtable_local_open); static BATADV_DEBUGINFO(vis_data, S_IRUGO, batadv_vis_data_open); +#ifdef CONFIG_BATMAN_ADV_NC +static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open); +#endif static struct batadv_debuginfo *batadv_mesh_debuginfos[] = { &batadv_debuginfo_originators, @@ -362,6 +374,9 @@ static struct batadv_debuginfo *batadv_mesh_debuginfos[] = { #endif &batadv_debuginfo_transtable_local, &batadv_debuginfo_vis_data, +#ifdef CONFIG_BATMAN_ADV_NC + &batadv_debuginfo_nc_nodes, +#endif NULL, }; @@ -431,6 +446,9 @@ int batadv_debugfs_add_meshif(struct net_device *dev) } } + if (batadv_nc_init_debugfs(bat_priv) < 0) + goto rem_attr; + return 0; rem_attr: debugfs_remove_recursive(bat_priv->debug_dir); diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index d54188a112ea..8e15d966d9b0 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -816,7 +816,6 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, bool ret = false; struct batadv_dat_entry *dat_entry = NULL; struct sk_buff *skb_new; - struct batadv_hard_iface *primary_if = NULL; if (!atomic_read(&bat_priv->distributed_arp_table)) goto out; @@ -838,22 +837,18 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst); if (dat_entry) { - primary_if = batadv_primary_if_get_selected(bat_priv); - if (!primary_if) - goto out; - skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src, - primary_if->soft_iface, ip_dst, hw_src, + bat_priv->soft_iface, ip_dst, hw_src, dat_entry->mac_addr, hw_src); if (!skb_new) goto out; skb_reset_mac_header(skb_new); skb_new->protocol = eth_type_trans(skb_new, - primary_if->soft_iface); + bat_priv->soft_iface); bat_priv->stats.rx_packets++; bat_priv->stats.rx_bytes += skb->len + ETH_HLEN; - primary_if->soft_iface->last_rx = jiffies; + bat_priv->soft_iface->last_rx = jiffies; netif_rx(skb_new); batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n"); @@ -866,8 +861,6 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, out: if (dat_entry) batadv_dat_entry_free_ref(dat_entry); - if (primary_if) - batadv_hardif_free_ref(primary_if); return ret; } @@ -887,7 +880,6 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, __be32 ip_src, ip_dst; uint8_t *hw_src; struct sk_buff *skb_new; - struct batadv_hard_iface *primary_if = NULL; struct batadv_dat_entry *dat_entry = NULL; bool ret = false; int err; @@ -912,12 +904,8 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, if (!dat_entry) goto out; - primary_if = batadv_primary_if_get_selected(bat_priv); - if (!primary_if) - goto out; - skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src, - primary_if->soft_iface, ip_dst, hw_src, + bat_priv->soft_iface, ip_dst, hw_src, dat_entry->mac_addr, hw_src); if (!skb_new) @@ -941,8 +929,6 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, out: if (dat_entry) batadv_dat_entry_free_ref(dat_entry); - if (primary_if) - batadv_hardif_free_ref(primary_if); if (ret) kfree_skb(skb); return ret; diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c index 34f99a46ec1d..f105219f4a4b 100644 --- a/net/batman-adv/gateway_client.c +++ b/net/batman-adv/gateway_client.c @@ -500,7 +500,7 @@ int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) rcu_read_unlock(); if (gw_count == 0) - seq_printf(seq, "No gateways in range ...\n"); + seq_puts(seq, "No gateways in range ...\n"); out: if (primary_if) diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 368219e026a9..522243aff2f3 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -307,11 +307,35 @@ batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) batadv_update_min_mtu(hard_iface->soft_iface); } +/** + * batadv_master_del_slave - remove hard_iface from the current master interface + * @slave: the interface enslaved in another master + * @master: the master from which slave has to be removed + * + * Invoke ndo_del_slave on master passing slave as argument. In this way slave + * is free'd and master can correctly change its internal state. + * Return 0 on success, a negative value representing the error otherwise + */ +static int batadv_master_del_slave(struct batadv_hard_iface *slave, + struct net_device *master) +{ + int ret; + + if (!master) + return 0; + + ret = -EBUSY; + if (master->netdev_ops->ndo_del_slave) + ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); + + return ret; +} + int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, const char *iface_name) { struct batadv_priv *bat_priv; - struct net_device *soft_iface; + struct net_device *soft_iface, *master; __be16 ethertype = __constant_htons(ETH_P_BATMAN); int ret; @@ -321,11 +345,6 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, if (!atomic_inc_not_zero(&hard_iface->refcount)) goto out; - /* hard-interface is part of a bridge */ - if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT) - pr_err("You are about to enable batman-adv on '%s' which already is part of a bridge. Unless you know exactly what you are doing this is probably wrong and won't work the way you think it would.\n", - hard_iface->net_dev->name); - soft_iface = dev_get_by_name(&init_net, iface_name); if (!soft_iface) { @@ -347,12 +366,24 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, goto err_dev; } + /* check if the interface is enslaved in another virtual one and + * in that case unlink it first + */ + master = netdev_master_upper_dev_get(hard_iface->net_dev); + ret = batadv_master_del_slave(hard_iface, master); + if (ret) + goto err_dev; + hard_iface->soft_iface = soft_iface; bat_priv = netdev_priv(hard_iface->soft_iface); + ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); + if (ret) + goto err_dev; + ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); if (ret < 0) - goto err_dev; + goto err_upper; hard_iface->if_num = bat_priv->num_ifaces; bat_priv->num_ifaces++; @@ -362,7 +393,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); bat_priv->num_ifaces--; hard_iface->if_status = BATADV_IF_NOT_IN_USE; - goto err_dev; + goto err_upper; } hard_iface->batman_adv_ptype.type = ethertype; @@ -401,14 +432,18 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, out: return 0; +err_upper: + netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); err_dev: + hard_iface->soft_iface = NULL; dev_put(soft_iface); err: batadv_hardif_free_ref(hard_iface); return ret; } -void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface) +void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, + enum batadv_hard_if_cleanup autodel) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_hard_iface *primary_if = NULL; @@ -446,9 +481,10 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface) dev_put(hard_iface->soft_iface); /* nobody uses this interface anymore */ - if (!bat_priv->num_ifaces) - batadv_softif_destroy(hard_iface->soft_iface); + if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO) + batadv_softif_destroy_sysfs(hard_iface->soft_iface); + netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); hard_iface->soft_iface = NULL; batadv_hardif_free_ref(hard_iface); @@ -533,7 +569,8 @@ static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) /* first deactivate interface */ if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) - batadv_hardif_disable_interface(hard_iface); + batadv_hardif_disable_interface(hard_iface, + BATADV_IF_CLEANUP_AUTO); if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) return; @@ -563,6 +600,11 @@ static int batadv_hard_if_event(struct notifier_block *this, struct batadv_hard_iface *primary_if = NULL; struct batadv_priv *bat_priv; + if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { + batadv_sysfs_add_meshif(net_dev); + return NOTIFY_DONE; + } + hard_iface = batadv_hardif_get_by_netdev(net_dev); if (!hard_iface && event == NETDEV_REGISTER) hard_iface = batadv_hardif_add_interface(net_dev); diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h index 308437d52e22..49892881a7c5 100644 --- a/net/batman-adv/hard-interface.h +++ b/net/batman-adv/hard-interface.h @@ -29,13 +29,24 @@ enum batadv_hard_if_state { BATADV_IF_I_WANT_YOU, }; +/** + * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal + * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface + * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed + */ +enum batadv_hard_if_cleanup { + BATADV_IF_CLEANUP_KEEP, + BATADV_IF_CLEANUP_AUTO, +}; + extern struct notifier_block batadv_hard_if_notifier; struct batadv_hard_iface* batadv_hardif_get_by_netdev(const struct net_device *net_dev); int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, const char *iface_name); -void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface); +void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, + enum batadv_hard_if_cleanup autodel); void batadv_hardif_remove_interfaces(void); int batadv_hardif_min_mtu(struct net_device *soft_iface); void batadv_update_min_mtu(struct net_device *soft_iface); diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 0488d70c8c35..6277735cd89e 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -35,6 +35,7 @@ #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, @@ -70,6 +71,7 @@ static int __init batadv_init(void) 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); @@ -80,6 +82,7 @@ static int __init batadv_init(void) 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(); @@ -135,6 +138,10 @@ int batadv_mesh_init(struct net_device *soft_iface) if (ret < 0) goto err; + ret = batadv_nc_init(bat_priv); + if (ret < 0) + goto err; + atomic_set(&bat_priv->gw.reselect, 0); atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); @@ -157,6 +164,7 @@ void batadv_mesh_free(struct net_device *soft_iface) batadv_gw_node_purge(bat_priv); batadv_originator_free(bat_priv); + batadv_nc_free(bat_priv); batadv_tt_free(bat_priv); @@ -411,7 +419,7 @@ int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) { struct batadv_algo_ops *bat_algo_ops; - seq_printf(seq, "Available routing algorithms:\n"); + 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); diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h index ced08b936a96..f90f5bc8e426 100644 --- a/net/batman-adv/main.h +++ b/net/batman-adv/main.h @@ -26,7 +26,7 @@ #define BATADV_DRIVER_DEVICE "batman-adv" #ifndef BATADV_SOURCE_VERSION -#define BATADV_SOURCE_VERSION "2013.1.0" +#define BATADV_SOURCE_VERSION "2013.2.0" #endif /* B.A.T.M.A.N. parameters */ @@ -105,6 +105,8 @@ #define BATADV_RESET_PROTECTION_MS 30000 #define BATADV_EXPECTED_SEQNO_RANGE 65536 +#define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */ + enum batadv_mesh_state { BATADV_MESH_INACTIVE, BATADV_MESH_ACTIVE, @@ -150,6 +152,7 @@ enum batadv_uev_type { #include <linux/percpu.h> #include <linux/slab.h> #include <net/sock.h> /* struct sock */ +#include <net/rtnetlink.h> #include <linux/jiffies.h> #include <linux/seq_file.h> #include "types.h" @@ -185,6 +188,7 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr); * @BATADV_DBG_TT: translation table messages * @BATADV_DBG_BLA: bridge loop avoidance messages * @BATADV_DBG_DAT: ARP snooping and DAT related messages + * @BATADV_DBG_NC: network coding related messages * @BATADV_DBG_ALL: the union of all the above log levels */ enum batadv_dbg_level { @@ -193,7 +197,8 @@ enum batadv_dbg_level { BATADV_DBG_TT = BIT(2), BATADV_DBG_BLA = BIT(3), BATADV_DBG_DAT = BIT(4), - BATADV_DBG_ALL = 31, + BATADV_DBG_NC = BIT(5), + BATADV_DBG_ALL = 63, }; #ifdef CONFIG_BATMAN_ADV_DEBUG @@ -298,4 +303,10 @@ static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv, return sum; } +/* Define a macro to reach the control buffer of the skb. The members of the + * control buffer are defined in struct batadv_skb_cb in types.h. + * The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h. + */ +#define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0])) + #endif /* _NET_BATMAN_ADV_MAIN_H_ */ diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c new file mode 100644 index 000000000000..6b9a54485314 --- /dev/null +++ b/net/batman-adv/network-coding.c @@ -0,0 +1,1821 @@ +/* Copyright (C) 2012-2013 B.A.T.M.A.N. contributors: + * + * Martin Hundebøll, Jeppe Ledet-Pedersen + * + * 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/debugfs.h> + +#include "main.h" +#include "hash.h" +#include "network-coding.h" +#include "send.h" +#include "originator.h" +#include "hard-interface.h" +#include "routing.h" + +static struct lock_class_key batadv_nc_coding_hash_lock_class_key; +static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; + +static void batadv_nc_worker(struct work_struct *work); +static int batadv_nc_recv_coded_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + +/** + * batadv_nc_start_timer - initialise the nc periodic worker + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_nc_start_timer(struct batadv_priv *bat_priv) +{ + queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work, + msecs_to_jiffies(10)); +} + +/** + * batadv_nc_init - initialise coding hash table and start house keeping + * @bat_priv: the bat priv with all the soft interface information + */ +int batadv_nc_init(struct batadv_priv *bat_priv) +{ + bat_priv->nc.timestamp_fwd_flush = jiffies; + bat_priv->nc.timestamp_sniffed_purge = jiffies; + + if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) + return 0; + + bat_priv->nc.coding_hash = batadv_hash_new(128); + if (!bat_priv->nc.coding_hash) + goto err; + + batadv_hash_set_lock_class(bat_priv->nc.coding_hash, + &batadv_nc_coding_hash_lock_class_key); + + bat_priv->nc.decoding_hash = batadv_hash_new(128); + if (!bat_priv->nc.decoding_hash) + goto err; + + batadv_hash_set_lock_class(bat_priv->nc.coding_hash, + &batadv_nc_decoding_hash_lock_class_key); + + /* Register our packet type */ + if (batadv_recv_handler_register(BATADV_CODED, + batadv_nc_recv_coded_packet) < 0) + goto err; + + INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); + batadv_nc_start_timer(bat_priv); + + return 0; + +err: + return -ENOMEM; +} + +/** + * batadv_nc_init_bat_priv - initialise the nc specific bat_priv variables + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) +{ + atomic_set(&bat_priv->network_coding, 1); + bat_priv->nc.min_tq = 200; + bat_priv->nc.max_fwd_delay = 10; + bat_priv->nc.max_buffer_time = 200; +} + +/** + * batadv_nc_init_orig - initialise the nc fields of an orig_node + * @orig_node: the orig_node which is going to be initialised + */ +void batadv_nc_init_orig(struct batadv_orig_node *orig_node) +{ + INIT_LIST_HEAD(&orig_node->in_coding_list); + INIT_LIST_HEAD(&orig_node->out_coding_list); + spin_lock_init(&orig_node->in_coding_list_lock); + spin_lock_init(&orig_node->out_coding_list_lock); +} + +/** + * batadv_nc_node_free_rcu - rcu callback to free an nc node and remove + * its refcount on the orig_node + * @rcu: rcu pointer of the nc node + */ +static void batadv_nc_node_free_rcu(struct rcu_head *rcu) +{ + struct batadv_nc_node *nc_node; + + nc_node = container_of(rcu, struct batadv_nc_node, rcu); + batadv_orig_node_free_ref(nc_node->orig_node); + kfree(nc_node); +} + +/** + * batadv_nc_node_free_ref - decrements the nc node refcounter and possibly + * frees it + * @nc_node: the nc node to free + */ +static void batadv_nc_node_free_ref(struct batadv_nc_node *nc_node) +{ + if (atomic_dec_and_test(&nc_node->refcount)) + call_rcu(&nc_node->rcu, batadv_nc_node_free_rcu); +} + +/** + * batadv_nc_path_free_ref - decrements the nc path refcounter and possibly + * frees it + * @nc_path: the nc node to free + */ +static void batadv_nc_path_free_ref(struct batadv_nc_path *nc_path) +{ + if (atomic_dec_and_test(&nc_path->refcount)) + kfree_rcu(nc_path, rcu); +} + +/** + * batadv_nc_packet_free - frees nc packet + * @nc_packet: the nc packet to free + */ +static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet) +{ + if (nc_packet->skb) + kfree_skb(nc_packet->skb); + + batadv_nc_path_free_ref(nc_packet->nc_path); + kfree(nc_packet); +} + +/** + * batadv_nc_to_purge_nc_node - checks whether an nc node has to be purged + * @bat_priv: the bat priv with all the soft interface information + * @nc_node: the nc node to check + * + * Returns true if the entry has to be purged now, false otherwise + */ +static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, + struct batadv_nc_node *nc_node) +{ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return true; + + return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT); +} + +/** + * batadv_nc_to_purge_nc_path_coding - checks whether an nc path has timed out + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path to check + * + * Returns true if the entry has to be purged now, false otherwise + */ +static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path) +{ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return true; + + /* purge the path when no packets has been added for 10 times the + * max_fwd_delay time + */ + return batadv_has_timed_out(nc_path->last_valid, + bat_priv->nc.max_fwd_delay * 10); +} + +/** + * batadv_nc_to_purge_nc_path_decoding - checks whether an nc path has timed out + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path to check + * + * Returns true if the entry has to be purged now, false otherwise + */ +static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path) +{ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return true; + + /* purge the path when no packets has been added for 10 times the + * max_buffer time + */ + return batadv_has_timed_out(nc_path->last_valid, + bat_priv->nc.max_buffer_time*10); +} + +/** + * batadv_nc_purge_orig_nc_nodes - go through list of nc nodes and purge stale + * entries + * @bat_priv: the bat priv with all the soft interface information + * @list: list of nc nodes + * @lock: nc node list lock + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true if the entry has to be deleted, false + * otherwise + */ +static void +batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, + struct list_head *list, + spinlock_t *lock, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)) +{ + struct batadv_nc_node *nc_node, *nc_node_tmp; + + /* For each nc_node in list */ + spin_lock_bh(lock); + list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) { + /* if an helper function has been passed as parameter, + * ask it if the entry has to be purged or not + */ + if (to_purge && !to_purge(bat_priv, nc_node)) + continue; + + batadv_dbg(BATADV_DBG_NC, bat_priv, + "Removing nc_node %pM -> %pM\n", + nc_node->addr, nc_node->orig_node->orig); + list_del_rcu(&nc_node->list); + batadv_nc_node_free_ref(nc_node); + } + spin_unlock_bh(lock); +} + +/** + * batadv_nc_purge_orig - purges all nc node data attached of the given + * originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig_node with the nc node entries to be purged + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true is the entry has to be deleted, false + * otherwise + */ +void batadv_nc_purge_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)) +{ + /* Check ingoing nc_node's of this orig_node */ + batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list, + &orig_node->in_coding_list_lock, + to_purge); + + /* Check outgoing nc_node's of this orig_node */ + batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list, + &orig_node->out_coding_list_lock, + to_purge); +} + +/** + * batadv_nc_purge_orig_hash - traverse entire originator hash to check if they + * have timed out nc nodes + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + struct batadv_orig_node *orig_node; + uint32_t i; + + if (!hash) + return; + + /* For each orig_node */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) + batadv_nc_purge_orig(bat_priv, orig_node, + batadv_nc_to_purge_nc_node); + rcu_read_unlock(); + } +} + +/** + * batadv_nc_purge_paths - traverse all nc paths part of the hash and remove + * unused ones + * @bat_priv: the bat priv with all the soft interface information + * @hash: hash table containing the nc paths to check + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true is the entry has to be deleted, false + * otherwise + */ +static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_path *)) +{ + struct hlist_head *head; + struct hlist_node *node_tmp; + struct batadv_nc_path *nc_path; + spinlock_t *lock; /* Protects lists in hash */ + uint32_t i; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + lock = &hash->list_locks[i]; + + /* For each nc_path in this bin */ + spin_lock_bh(lock); + hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) { + /* if an helper function has been passed as parameter, + * ask it if the entry has to be purged or not + */ + if (to_purge && !to_purge(bat_priv, nc_path)) + continue; + + /* purging an non-empty nc_path should never happen, but + * is observed under high CPU load. Delay the purging + * until next iteration to allow the packet_list to be + * emptied first. + */ + if (!unlikely(list_empty(&nc_path->packet_list))) { + net_ratelimited_function(printk, + KERN_WARNING + "Skipping free of non-empty nc_path (%pM -> %pM)!\n", + nc_path->prev_hop, + nc_path->next_hop); + continue; + } + + /* nc_path is unused, so remove it */ + batadv_dbg(BATADV_DBG_NC, bat_priv, + "Remove nc_path %pM -> %pM\n", + nc_path->prev_hop, nc_path->next_hop); + hlist_del_rcu(&nc_path->hash_entry); + batadv_nc_path_free_ref(nc_path); + } + spin_unlock_bh(lock); + } +} + +/** + * batadv_nc_hash_key_gen - computes the nc_path hash key + * @key: buffer to hold the final hash key + * @src: source ethernet mac address going into the hash key + * @dst: destination ethernet mac address going into the hash key + */ +static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, + const char *dst) +{ + memcpy(key->prev_hop, src, sizeof(key->prev_hop)); + memcpy(key->next_hop, dst, sizeof(key->next_hop)); +} + +/** + * batadv_nc_hash_choose - compute the hash value for an nc path + * @data: data to hash + * @size: size of the hash table + * + * Returns the selected index in the hash table for the given data. + */ +static uint32_t batadv_nc_hash_choose(const void *data, uint32_t size) +{ + const struct batadv_nc_path *nc_path = data; + uint32_t hash = 0; + + hash = batadv_hash_bytes(hash, &nc_path->prev_hop, + sizeof(nc_path->prev_hop)); + hash = batadv_hash_bytes(hash, &nc_path->next_hop, + sizeof(nc_path->next_hop)); + + hash += (hash << 3); + hash ^= (hash >> 11); + hash += (hash << 15); + + return hash % size; +} + +/** + * batadv_nc_hash_compare - comparing function used in the network coding hash + * tables + * @node: node in the local table + * @data2: second object to compare the node to + * + * Returns 1 if the two entry are the same, 0 otherwise + */ +static int batadv_nc_hash_compare(const struct hlist_node *node, + const void *data2) +{ + const struct batadv_nc_path *nc_path1, *nc_path2; + + nc_path1 = container_of(node, struct batadv_nc_path, hash_entry); + nc_path2 = data2; + + /* Return 1 if the two keys are identical */ + if (memcmp(nc_path1->prev_hop, nc_path2->prev_hop, + sizeof(nc_path1->prev_hop)) != 0) + return 0; + + if (memcmp(nc_path1->next_hop, nc_path2->next_hop, + sizeof(nc_path1->next_hop)) != 0) + return 0; + + return 1; +} + +/** + * batadv_nc_hash_find - search for an existing nc path and return it + * @hash: hash table containing the nc path + * @data: search key + * + * Returns the nc_path if found, NULL otherwise. + */ +static struct batadv_nc_path * +batadv_nc_hash_find(struct batadv_hashtable *hash, + void *data) +{ + struct hlist_head *head; + struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; + int index; + + if (!hash) + return NULL; + + index = batadv_nc_hash_choose(data, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, head, hash_entry) { + if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) + continue; + + if (!atomic_inc_not_zero(&nc_path->refcount)) + continue; + + nc_path_tmp = nc_path; + break; + } + rcu_read_unlock(); + + return nc_path_tmp; +} + +/** + * batadv_nc_send_packet - send non-coded packet and free nc_packet struct + * @nc_packet: the nc packet to send + */ +static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) +{ + batadv_send_skb_packet(nc_packet->skb, + nc_packet->neigh_node->if_incoming, + nc_packet->nc_path->next_hop); + nc_packet->skb = NULL; + batadv_nc_packet_free(nc_packet); +} + +/** + * batadv_nc_sniffed_purge - Checks timestamp of given sniffed nc_packet. + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path the packet belongs to + * @nc_packet: the nc packet to be checked + * + * Checks whether the given sniffed (overheard) nc_packet has hit its buffering + * timeout. If so, the packet is no longer kept and the entry deleted from the + * queue. Has to be called with the appropriate locks. + * + * Returns false as soon as the entry in the fifo queue has not been timed out + * yet and true otherwise. + */ +static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path, + struct batadv_nc_packet *nc_packet) +{ + unsigned long timeout = bat_priv->nc.max_buffer_time; + bool res = false; + + /* Packets are added to tail, so the remaining packets did not time + * out and we can stop processing the current queue + */ + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && + !batadv_has_timed_out(nc_packet->timestamp, timeout)) + goto out; + + /* purge nc packet */ + list_del(&nc_packet->list); + batadv_nc_packet_free(nc_packet); + + res = true; + +out: + return res; +} + +/** + * batadv_nc_fwd_flush - Checks the timestamp of the given nc packet. + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path the packet belongs to + * @nc_packet: the nc packet to be checked + * + * Checks whether the given nc packet has hit its forward timeout. If so, the + * packet is no longer delayed, immediately sent and the entry deleted from the + * queue. Has to be called with the appropriate locks. + * + * Returns false as soon as the entry in the fifo queue has not been timed out + * yet and true otherwise. + */ +static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path, + struct batadv_nc_packet *nc_packet) +{ + unsigned long timeout = bat_priv->nc.max_fwd_delay; + + /* Packets are added to tail, so the remaining packets did not time + * out and we can stop processing the current queue + */ + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && + !batadv_has_timed_out(nc_packet->timestamp, timeout)) + return false; + + /* Send packet */ + batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); + batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, + nc_packet->skb->len + ETH_HLEN); + list_del(&nc_packet->list); + batadv_nc_send_packet(nc_packet); + + return true; +} + +/** + * batadv_nc_process_nc_paths - traverse given nc packet pool and free timed out + * nc packets + * @bat_priv: the bat priv with all the soft interface information + * @hash: to be processed hash table + * @process_fn: Function called to process given nc packet. Should return true + * to encourage this function to proceed with the next packet. + * Otherwise the rest of the current queue is skipped. + */ +static void +batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + bool (*process_fn)(struct batadv_priv *, + struct batadv_nc_path *, + struct batadv_nc_packet *)) +{ + struct hlist_head *head; + struct batadv_nc_packet *nc_packet, *nc_packet_tmp; + struct batadv_nc_path *nc_path; + bool ret; + int i; + + if (!hash) + return; + + /* Loop hash table bins */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + /* Loop coding paths */ + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, head, hash_entry) { + /* Loop packets */ + spin_lock_bh(&nc_path->packet_list_lock); + list_for_each_entry_safe(nc_packet, nc_packet_tmp, + &nc_path->packet_list, list) { + ret = process_fn(bat_priv, nc_path, nc_packet); + if (!ret) + break; + } + spin_unlock_bh(&nc_path->packet_list_lock); + } + rcu_read_unlock(); + } +} + +/** + * batadv_nc_worker - periodic task for house keeping related to network coding + * @work: kernel work struct + */ +static void batadv_nc_worker(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv_nc *priv_nc; + struct batadv_priv *bat_priv; + unsigned long timeout; + + delayed_work = container_of(work, struct delayed_work, work); + priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); + bat_priv = container_of(priv_nc, struct batadv_priv, nc); + + batadv_nc_purge_orig_hash(bat_priv); + batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, + batadv_nc_to_purge_nc_path_coding); + batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, + batadv_nc_to_purge_nc_path_decoding); + + timeout = bat_priv->nc.max_fwd_delay; + + if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { + batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, + batadv_nc_fwd_flush); + bat_priv->nc.timestamp_fwd_flush = jiffies; + } + + if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, + bat_priv->nc.max_buffer_time)) { + batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, + batadv_nc_sniffed_purge); + bat_priv->nc.timestamp_sniffed_purge = jiffies; + } + + /* Schedule a new check */ + batadv_nc_start_timer(bat_priv); +} + +/** + * batadv_can_nc_with_orig - checks whether the given orig node is suitable for + * coding or not + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: neighboring orig node which may be used as nc candidate + * @ogm_packet: incoming ogm packet also used for the checks + * + * Returns true if: + * 1) The OGM must have the most recent sequence number. + * 2) The TTL must be decremented by one and only one. + * 3) The OGM must be received from the first hop from orig_node. + * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. + */ +static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_ogm_packet *ogm_packet) +{ + if (orig_node->last_real_seqno != ntohl(ogm_packet->seqno)) + return false; + if (orig_node->last_ttl != ogm_packet->header.ttl + 1) + return false; + if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) + return false; + if (ogm_packet->tq < bat_priv->nc.min_tq) + return false; + + return true; +} + +/** + * batadv_nc_find_nc_node - search for an existing nc node and return it + * @orig_node: orig node originating the ogm packet + * @orig_neigh_node: neighboring orig node from which we received the ogm packet + * (can be equal to orig_node) + * @in_coding: traverse incoming or outgoing network coding list + * + * Returns the nc_node if found, NULL otherwise. + */ +static struct batadv_nc_node +*batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + bool in_coding) +{ + struct batadv_nc_node *nc_node, *nc_node_out = NULL; + struct list_head *list; + + if (in_coding) + list = &orig_neigh_node->in_coding_list; + else + list = &orig_neigh_node->out_coding_list; + + /* Traverse list of nc_nodes to orig_node */ + rcu_read_lock(); + list_for_each_entry_rcu(nc_node, list, list) { + if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) + continue; + + if (!atomic_inc_not_zero(&nc_node->refcount)) + continue; + + /* Found a match */ + nc_node_out = nc_node; + break; + } + rcu_read_unlock(); + + return nc_node_out; +} + +/** + * batadv_nc_get_nc_node - retrieves an nc node or creates the entry if it was + * not found + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node originating the ogm packet + * @orig_neigh_node: neighboring orig node from which we received the ogm packet + * (can be equal to orig_node) + * @in_coding: traverse incoming or outgoing network coding list + * + * Returns the nc_node if found or created, NULL in case of an error. + */ +static struct batadv_nc_node +*batadv_nc_get_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + bool in_coding) +{ + struct batadv_nc_node *nc_node; + spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ + struct list_head *list; + + /* Check if nc_node is already added */ + nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); + + /* Node found */ + if (nc_node) + return nc_node; + + nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); + if (!nc_node) + return NULL; + + if (!atomic_inc_not_zero(&orig_neigh_node->refcount)) + goto free; + + /* Initialize nc_node */ + INIT_LIST_HEAD(&nc_node->list); + memcpy(nc_node->addr, orig_node->orig, ETH_ALEN); + nc_node->orig_node = orig_neigh_node; + atomic_set(&nc_node->refcount, 2); + + /* Select ingoing or outgoing coding node */ + if (in_coding) { + lock = &orig_neigh_node->in_coding_list_lock; + list = &orig_neigh_node->in_coding_list; + } else { + lock = &orig_neigh_node->out_coding_list_lock; + list = &orig_neigh_node->out_coding_list; + } + + batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", + nc_node->addr, nc_node->orig_node->orig); + + /* Add nc_node to orig_node */ + spin_lock_bh(lock); + list_add_tail_rcu(&nc_node->list, list); + spin_unlock_bh(lock); + + return nc_node; + +free: + kfree(nc_node); + return NULL; +} + +/** + * batadv_nc_update_nc_node - updates stored incoming and outgoing nc node structs + * (best called on incoming OGMs) + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node originating the ogm packet + * @orig_neigh_node: neighboring orig node from which we received the ogm packet + * (can be equal to orig_node) + * @ogm_packet: incoming ogm packet + * @is_single_hop_neigh: orig_node is a single hop neighbor + */ +void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *ogm_packet, + int is_single_hop_neigh) +{ + struct batadv_nc_node *in_nc_node = NULL, *out_nc_node = NULL; + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto out; + + /* accept ogms from 'good' neighbors and single hop neighbors */ + if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && + !is_single_hop_neigh) + goto out; + + /* Add orig_node as in_nc_node on hop */ + in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, + orig_neigh_node, true); + if (!in_nc_node) + goto out; + + in_nc_node->last_seen = jiffies; + + /* Add hop as out_nc_node on orig_node */ + out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, + orig_node, false); + if (!out_nc_node) + goto out; + + out_nc_node->last_seen = jiffies; + +out: + if (in_nc_node) + batadv_nc_node_free_ref(in_nc_node); + if (out_nc_node) + batadv_nc_node_free_ref(out_nc_node); +} + +/** + * batadv_nc_get_path - get existing nc_path or allocate a new one + * @bat_priv: the bat priv with all the soft interface information + * @hash: hash table containing the nc path + * @src: ethernet source address - first half of the nc path search key + * @dst: ethernet destination address - second half of the nc path search key + * + * Returns pointer to nc_path if the path was found or created, returns NULL + * on error. + */ +static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + uint8_t *src, + uint8_t *dst) +{ + int hash_added; + struct batadv_nc_path *nc_path, nc_path_key; + + batadv_nc_hash_key_gen(&nc_path_key, src, dst); + + /* Search for existing nc_path */ + nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); + + if (nc_path) { + /* Set timestamp to delay removal of nc_path */ + nc_path->last_valid = jiffies; + return nc_path; + } + + /* No existing nc_path was found; create a new */ + nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); + + if (!nc_path) + return NULL; + + /* Initialize nc_path */ + INIT_LIST_HEAD(&nc_path->packet_list); + spin_lock_init(&nc_path->packet_list_lock); + atomic_set(&nc_path->refcount, 2); + nc_path->last_valid = jiffies; + memcpy(nc_path->next_hop, dst, ETH_ALEN); + memcpy(nc_path->prev_hop, src, ETH_ALEN); + + batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", + nc_path->prev_hop, + nc_path->next_hop); + + /* Add nc_path to hash table */ + hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, + batadv_nc_hash_choose, &nc_path_key, + &nc_path->hash_entry); + + if (hash_added < 0) { + kfree(nc_path); + return NULL; + } + + return nc_path; +} + +/** + * batadv_nc_random_weight_tq - scale the receivers TQ-value to avoid unfair + * selection of a receiver with slightly lower TQ than the other + * @tq: to be weighted tq value + */ +static uint8_t batadv_nc_random_weight_tq(uint8_t tq) +{ + uint8_t rand_val, rand_tq; + + get_random_bytes(&rand_val, sizeof(rand_val)); + + /* randomize the estimated packet loss (max TQ - estimated TQ) */ + rand_tq = rand_val * (BATADV_TQ_MAX_VALUE - tq); + + /* normalize the randomized packet loss */ + rand_tq /= BATADV_TQ_MAX_VALUE; + + /* convert to (randomized) estimated tq again */ + return BATADV_TQ_MAX_VALUE - rand_tq; +} + +/** + * batadv_nc_memxor - XOR destination with source + * @dst: byte array to XOR into + * @src: byte array to XOR from + * @len: length of destination array + */ +static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) +{ + unsigned int i; + + for (i = 0; i < len; ++i) + dst[i] ^= src[i]; +} + +/** + * batadv_nc_code_packets - code a received unicast_packet with an nc packet + * into a coded_packet and send it + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to forward + * @ethhdr: pointer to the ethernet header inside the skb + * @nc_packet: structure containing the packet to the skb can be coded with + * @neigh_node: next hop to forward packet to + * + * Returns true if both packets are consumed, false otherwise. + */ +static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, + struct sk_buff *skb, + struct ethhdr *ethhdr, + struct batadv_nc_packet *nc_packet, + struct batadv_neigh_node *neigh_node) +{ + uint8_t tq_weighted_neigh, tq_weighted_coding; + struct sk_buff *skb_dest, *skb_src; + struct batadv_unicast_packet *packet1; + struct batadv_unicast_packet *packet2; + struct batadv_coded_packet *coded_packet; + struct batadv_neigh_node *neigh_tmp, *router_neigh; + struct batadv_neigh_node *router_coding = NULL; + uint8_t *first_source, *first_dest, *second_source, *second_dest; + __be32 packet_id1, packet_id2; + size_t count; + bool res = false; + int coding_len; + int unicast_size = sizeof(*packet1); + int coded_size = sizeof(*coded_packet); + int header_add = coded_size - unicast_size; + + router_neigh = batadv_orig_node_get_router(neigh_node->orig_node); + if (!router_neigh) + goto out; + + neigh_tmp = nc_packet->neigh_node; + router_coding = batadv_orig_node_get_router(neigh_tmp->orig_node); + if (!router_coding) + goto out; + + tq_weighted_neigh = batadv_nc_random_weight_tq(router_neigh->tq_avg); + tq_weighted_coding = batadv_nc_random_weight_tq(router_coding->tq_avg); + + /* Select one destination for the MAC-header dst-field based on + * weighted TQ-values. + */ + if (tq_weighted_neigh >= tq_weighted_coding) { + /* Destination from nc_packet is selected for MAC-header */ + first_dest = nc_packet->nc_path->next_hop; + first_source = nc_packet->nc_path->prev_hop; + second_dest = neigh_node->addr; + second_source = ethhdr->h_source; + packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; + packet2 = (struct batadv_unicast_packet *)skb->data; + packet_id1 = nc_packet->packet_id; + packet_id2 = batadv_skb_crc32(skb, + skb->data + sizeof(*packet2)); + } else { + /* Destination for skb is selected for MAC-header */ + first_dest = neigh_node->addr; + first_source = ethhdr->h_source; + second_dest = nc_packet->nc_path->next_hop; + second_source = nc_packet->nc_path->prev_hop; + packet1 = (struct batadv_unicast_packet *)skb->data; + packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; + packet_id1 = batadv_skb_crc32(skb, + skb->data + sizeof(*packet1)); + packet_id2 = nc_packet->packet_id; + } + + /* Instead of zero padding the smallest data buffer, we + * code into the largest. + */ + if (skb->len <= nc_packet->skb->len) { + skb_dest = nc_packet->skb; + skb_src = skb; + } else { + skb_dest = skb; + skb_src = nc_packet->skb; + } + + /* coding_len is used when decoding the packet shorter packet */ + coding_len = skb_src->len - unicast_size; + + if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) + goto out; + + skb_push(skb_dest, header_add); + + coded_packet = (struct batadv_coded_packet *)skb_dest->data; + skb_reset_mac_header(skb_dest); + + coded_packet->header.packet_type = BATADV_CODED; + coded_packet->header.version = BATADV_COMPAT_VERSION; + coded_packet->header.ttl = packet1->header.ttl; + + /* Info about first unicast packet */ + memcpy(coded_packet->first_source, first_source, ETH_ALEN); + memcpy(coded_packet->first_orig_dest, packet1->dest, ETH_ALEN); + coded_packet->first_crc = packet_id1; + coded_packet->first_ttvn = packet1->ttvn; + + /* Info about second unicast packet */ + memcpy(coded_packet->second_dest, second_dest, ETH_ALEN); + memcpy(coded_packet->second_source, second_source, ETH_ALEN); + memcpy(coded_packet->second_orig_dest, packet2->dest, ETH_ALEN); + coded_packet->second_crc = packet_id2; + coded_packet->second_ttl = packet2->header.ttl; + coded_packet->second_ttvn = packet2->ttvn; + coded_packet->coded_len = htons(coding_len); + + /* This is where the magic happens: Code skb_src into skb_dest */ + batadv_nc_memxor(skb_dest->data + coded_size, + skb_src->data + unicast_size, coding_len); + + /* Update counters accordingly */ + if (BATADV_SKB_CB(skb_src)->decoded && + BATADV_SKB_CB(skb_dest)->decoded) { + /* Both packets are recoded */ + count = skb_src->len + ETH_HLEN; + count += skb_dest->len + ETH_HLEN; + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); + } else if (!BATADV_SKB_CB(skb_src)->decoded && + !BATADV_SKB_CB(skb_dest)->decoded) { + /* Both packets are newly coded */ + count = skb_src->len + ETH_HLEN; + count += skb_dest->len + ETH_HLEN; + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); + } else if (BATADV_SKB_CB(skb_src)->decoded && + !BATADV_SKB_CB(skb_dest)->decoded) { + /* skb_src recoded and skb_dest is newly coded */ + batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, + skb_src->len + ETH_HLEN); + batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, + skb_dest->len + ETH_HLEN); + } else if (!BATADV_SKB_CB(skb_src)->decoded && + BATADV_SKB_CB(skb_dest)->decoded) { + /* skb_src is newly coded and skb_dest is recoded */ + batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, + skb_src->len + ETH_HLEN); + batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, + skb_dest->len + ETH_HLEN); + } + + /* skb_src is now coded into skb_dest, so free it */ + kfree_skb(skb_src); + + /* avoid duplicate free of skb from nc_packet */ + nc_packet->skb = NULL; + batadv_nc_packet_free(nc_packet); + + /* Send the coded packet and return true */ + batadv_send_skb_packet(skb_dest, neigh_node->if_incoming, first_dest); + res = true; +out: + if (router_neigh) + batadv_neigh_node_free_ref(router_neigh); + if (router_coding) + batadv_neigh_node_free_ref(router_coding); + return res; +} + +/** + * batadv_nc_skb_coding_possible - true if a decoded skb is available at dst. + * @skb: data skb to forward + * @dst: destination mac address of the other skb to code with + * @src: source mac address of skb + * + * Whenever we network code a packet we have to check whether we received it in + * a network coded form. If so, we may not be able to use it for coding because + * some neighbors may also have received (overheard) the packet in the network + * coded form without being able to decode it. It is hard to know which of the + * neighboring nodes was able to decode the packet, therefore we can only + * re-code the packet if the source of the previous encoded packet is involved. + * Since the source encoded the packet we can be certain it has all necessary + * decode information. + * + * Returns true if coding of a decoded packet is allowed. + */ +static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, + uint8_t *dst, uint8_t *src) +{ + if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) + return false; + else + return true; +} + +/** + * batadv_nc_path_search - Find the coding path matching in_nc_node and + * out_nc_node to retrieve a buffered packet that can be used for coding. + * @bat_priv: the bat priv with all the soft interface information + * @in_nc_node: pointer to skb next hop's neighbor nc node + * @out_nc_node: pointer to skb source's neighbor nc node + * @skb: data skb to forward + * @eth_dst: next hop mac address of skb + * + * Returns true if coding of a decoded skb is allowed. + */ +static struct batadv_nc_packet * +batadv_nc_path_search(struct batadv_priv *bat_priv, + struct batadv_nc_node *in_nc_node, + struct batadv_nc_node *out_nc_node, + struct sk_buff *skb, + uint8_t *eth_dst) +{ + struct batadv_nc_path *nc_path, nc_path_key; + struct batadv_nc_packet *nc_packet_out = NULL; + struct batadv_nc_packet *nc_packet, *nc_packet_tmp; + struct batadv_hashtable *hash = bat_priv->nc.coding_hash; + int idx; + + if (!hash) + return NULL; + + /* Create almost path key */ + batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, + out_nc_node->addr); + idx = batadv_nc_hash_choose(&nc_path_key, hash->size); + + /* Check for coding opportunities in this nc_path */ + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { + if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) + continue; + + if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) + continue; + + spin_lock_bh(&nc_path->packet_list_lock); + if (list_empty(&nc_path->packet_list)) { + spin_unlock_bh(&nc_path->packet_list_lock); + continue; + } + + list_for_each_entry_safe(nc_packet, nc_packet_tmp, + &nc_path->packet_list, list) { + if (!batadv_nc_skb_coding_possible(nc_packet->skb, + eth_dst, + in_nc_node->addr)) + continue; + + /* Coding opportunity is found! */ + list_del(&nc_packet->list); + nc_packet_out = nc_packet; + break; + } + + spin_unlock_bh(&nc_path->packet_list_lock); + break; + } + rcu_read_unlock(); + + return nc_packet_out; +} + +/** + * batadv_nc_skb_src_search - Loops through the list of neighoring nodes of the + * skb's sender (may be equal to the originator). + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to forward + * @eth_dst: next hop mac address of skb + * @eth_src: source mac address of skb + * @in_nc_node: pointer to skb next hop's neighbor nc node + * + * Returns an nc packet if a suitable coding packet was found, NULL otherwise. + */ +static struct batadv_nc_packet * +batadv_nc_skb_src_search(struct batadv_priv *bat_priv, + struct sk_buff *skb, + uint8_t *eth_dst, + uint8_t *eth_src, + struct batadv_nc_node *in_nc_node) +{ + struct batadv_orig_node *orig_node; + struct batadv_nc_node *out_nc_node; + struct batadv_nc_packet *nc_packet = NULL; + + orig_node = batadv_orig_hash_find(bat_priv, eth_src); + if (!orig_node) + return NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(out_nc_node, + &orig_node->out_coding_list, list) { + /* Check if the skb is decoded and if recoding is possible */ + if (!batadv_nc_skb_coding_possible(skb, + out_nc_node->addr, eth_src)) + continue; + + /* Search for an opportunity in this nc_path */ + nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, + out_nc_node, skb, eth_dst); + if (nc_packet) + break; + } + rcu_read_unlock(); + + batadv_orig_node_free_ref(orig_node); + return nc_packet; +} + +/** + * batadv_nc_skb_store_before_coding - set the ethernet src and dst of the + * unicast skb before it is stored for use in later decoding + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to store + * @eth_dst_new: new destination mac address of skb + */ +static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, + struct sk_buff *skb, + uint8_t *eth_dst_new) +{ + struct ethhdr *ethhdr; + + /* Copy skb header to change the mac header */ + skb = pskb_copy(skb, GFP_ATOMIC); + if (!skb) + return; + + /* Set the mac header as if we actually sent the packet uncoded */ + ethhdr = (struct ethhdr *)skb_mac_header(skb); + memcpy(ethhdr->h_source, ethhdr->h_dest, ETH_ALEN); + memcpy(ethhdr->h_dest, eth_dst_new, ETH_ALEN); + + /* Set data pointer to MAC header to mimic packets from our tx path */ + skb_push(skb, ETH_HLEN); + + /* Add the packet to the decoding packet pool */ + batadv_nc_skb_store_for_decoding(bat_priv, skb); + + /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free + * our ref + */ + kfree_skb(skb); +} + +/** + * batadv_nc_skb_dst_search - Loops through list of neighboring nodes to dst. + * @skb: data skb to forward + * @neigh_node: next hop to forward packet to + * @ethhdr: pointer to the ethernet header inside the skb + * + * Loops through list of neighboring nodes the next hop has a good connection to + * (receives OGMs with a sufficient quality). We need to find a neighbor of our + * next hop that potentially sent a packet which our next hop also received + * (overheard) and has stored for later decoding. + * + * Returns true if the skb was consumed (encoded packet sent) or false otherwise + */ +static bool batadv_nc_skb_dst_search(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node, + struct ethhdr *ethhdr) +{ + struct net_device *netdev = neigh_node->if_incoming->soft_iface; + struct batadv_priv *bat_priv = netdev_priv(netdev); + struct batadv_orig_node *orig_node = neigh_node->orig_node; + struct batadv_nc_node *nc_node; + struct batadv_nc_packet *nc_packet = NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { + /* Search for coding opportunity with this in_nc_node */ + nc_packet = batadv_nc_skb_src_search(bat_priv, skb, + neigh_node->addr, + ethhdr->h_source, nc_node); + + /* Opportunity was found, so stop searching */ + if (nc_packet) + break; + } + rcu_read_unlock(); + + if (!nc_packet) + return false; + + /* Save packets for later decoding */ + batadv_nc_skb_store_before_coding(bat_priv, skb, + neigh_node->addr); + batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, + nc_packet->neigh_node->addr); + + /* Code and send packets */ + if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, + neigh_node)) + return true; + + /* out of mem ? Coding failed - we have to free the buffered packet + * to avoid memleaks. The skb passed as argument will be dealt with + * by the calling function. + */ + batadv_nc_send_packet(nc_packet); + return false; +} + +/** + * batadv_nc_skb_add_to_path - buffer skb for later encoding / decoding + * @skb: skb to add to path + * @nc_path: path to add skb to + * @neigh_node: next hop to forward packet to + * @packet_id: checksum to identify packet + * + * Returns true if the packet was buffered or false in case of an error. + */ +static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, + struct batadv_nc_path *nc_path, + struct batadv_neigh_node *neigh_node, + __be32 packet_id) +{ + struct batadv_nc_packet *nc_packet; + + nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); + if (!nc_packet) + return false; + + /* Initialize nc_packet */ + nc_packet->timestamp = jiffies; + nc_packet->packet_id = packet_id; + nc_packet->skb = skb; + nc_packet->neigh_node = neigh_node; + nc_packet->nc_path = nc_path; + + /* Add coding packet to list */ + spin_lock_bh(&nc_path->packet_list_lock); + list_add_tail(&nc_packet->list, &nc_path->packet_list); + spin_unlock_bh(&nc_path->packet_list_lock); + + return true; +} + +/** + * batadv_nc_skb_forward - try to code a packet or add it to the coding packet + * buffer + * @skb: data skb to forward + * @neigh_node: next hop to forward packet to + * @ethhdr: pointer to the ethernet header inside the skb + * + * Returns true if the skb was consumed (encoded packet sent) or false otherwise + */ +bool batadv_nc_skb_forward(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node, + struct ethhdr *ethhdr) +{ + const struct net_device *netdev = neigh_node->if_incoming->soft_iface; + struct batadv_priv *bat_priv = netdev_priv(netdev); + struct batadv_unicast_packet *packet; + struct batadv_nc_path *nc_path; + __be32 packet_id; + u8 *payload; + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto out; + + /* We only handle unicast packets */ + payload = skb_network_header(skb); + packet = (struct batadv_unicast_packet *)payload; + if (packet->header.packet_type != BATADV_UNICAST) + goto out; + + /* Try to find a coding opportunity and send the skb if one is found */ + if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) + return true; + + /* Find or create a nc_path for this src-dst pair */ + nc_path = batadv_nc_get_path(bat_priv, + bat_priv->nc.coding_hash, + ethhdr->h_source, + neigh_node->addr); + + if (!nc_path) + goto out; + + /* Add skb to nc_path */ + packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); + if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) + goto free_nc_path; + + /* Packet is consumed */ + return true; + +free_nc_path: + batadv_nc_path_free_ref(nc_path); +out: + /* Packet is not consumed */ + return false; +} + +/** + * batadv_nc_skb_store_for_decoding - save a clone of the skb which can be used + * when decoding coded packets + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to store + */ +void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_unicast_packet *packet; + struct batadv_nc_path *nc_path; + struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); + __be32 packet_id; + u8 *payload; + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto out; + + /* Check for supported packet type */ + payload = skb_network_header(skb); + packet = (struct batadv_unicast_packet *)payload; + if (packet->header.packet_type != BATADV_UNICAST) + goto out; + + /* Find existing nc_path or create a new */ + nc_path = batadv_nc_get_path(bat_priv, + bat_priv->nc.decoding_hash, + ethhdr->h_source, + ethhdr->h_dest); + + if (!nc_path) + goto out; + + /* Clone skb and adjust skb->data to point at batman header */ + skb = skb_clone(skb, GFP_ATOMIC); + if (unlikely(!skb)) + goto free_nc_path; + + if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) + goto free_skb; + + if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) + goto free_skb; + + /* Add skb to nc_path */ + packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); + if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) + goto free_skb; + + batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); + return; + +free_skb: + kfree_skb(skb); +free_nc_path: + batadv_nc_path_free_ref(nc_path); +out: + return; +} + +/** + * batadv_nc_skb_store_sniffed_unicast - check if a received unicast packet + * should be saved in the decoding buffer and, if so, store it there + * @bat_priv: the bat priv with all the soft interface information + * @skb: unicast skb to store + */ +void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); + + if (batadv_is_my_mac(ethhdr->h_dest)) + return; + + /* Set data pointer to MAC header to mimic packets from our tx path */ + skb_push(skb, ETH_HLEN); + + batadv_nc_skb_store_for_decoding(bat_priv, skb); +} + +/** + * batadv_nc_skb_decode_packet - decode given skb using the decode data stored + * in nc_packet + * @skb: unicast skb to decode + * @nc_packet: decode data needed to decode the skb + * + * Returns pointer to decoded unicast packet if the packet was decoded or NULL + * in case of an error. + */ +static struct batadv_unicast_packet * +batadv_nc_skb_decode_packet(struct sk_buff *skb, + struct batadv_nc_packet *nc_packet) +{ + const int h_size = sizeof(struct batadv_unicast_packet); + const int h_diff = sizeof(struct batadv_coded_packet) - h_size; + struct batadv_unicast_packet *unicast_packet; + struct batadv_coded_packet coded_packet_tmp; + struct ethhdr *ethhdr, ethhdr_tmp; + uint8_t *orig_dest, ttl, ttvn; + unsigned int coding_len; + + /* Save headers temporarily */ + memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp)); + memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp)); + + if (skb_cow(skb, 0) < 0) + return NULL; + + if (unlikely(!skb_pull_rcsum(skb, h_diff))) + return NULL; + + /* Data points to batman header, so set mac header 14 bytes before + * and network to data + */ + skb_set_mac_header(skb, -ETH_HLEN); + skb_reset_network_header(skb); + + /* Reconstruct original mac header */ + ethhdr = (struct ethhdr *)skb_mac_header(skb); + memcpy(ethhdr, ðhdr_tmp, sizeof(*ethhdr)); + + /* Select the correct unicast header information based on the location + * of our mac address in the coded_packet header + */ + if (batadv_is_my_mac(coded_packet_tmp.second_dest)) { + /* If we are the second destination the packet was overheard, + * so the Ethernet address must be copied to h_dest and + * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST + */ + memcpy(ethhdr->h_dest, coded_packet_tmp.second_dest, ETH_ALEN); + skb->pkt_type = PACKET_HOST; + + orig_dest = coded_packet_tmp.second_orig_dest; + ttl = coded_packet_tmp.second_ttl; + ttvn = coded_packet_tmp.second_ttvn; + } else { + orig_dest = coded_packet_tmp.first_orig_dest; + ttl = coded_packet_tmp.header.ttl; + ttvn = coded_packet_tmp.first_ttvn; + } + + coding_len = ntohs(coded_packet_tmp.coded_len); + + if (coding_len > skb->len) + return NULL; + + /* Here the magic is reversed: + * extract the missing packet from the received coded packet + */ + batadv_nc_memxor(skb->data + h_size, + nc_packet->skb->data + h_size, + coding_len); + + /* Resize decoded skb if decoded with larger packet */ + if (nc_packet->skb->len > coding_len + h_size) + pskb_trim_rcsum(skb, coding_len + h_size); + + /* Create decoded unicast packet */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_packet->header.packet_type = BATADV_UNICAST; + unicast_packet->header.version = BATADV_COMPAT_VERSION; + unicast_packet->header.ttl = ttl; + memcpy(unicast_packet->dest, orig_dest, ETH_ALEN); + unicast_packet->ttvn = ttvn; + + batadv_nc_packet_free(nc_packet); + return unicast_packet; +} + +/** + * batadv_nc_find_decoding_packet - search through buffered decoding data to + * find the data needed to decode the coded packet + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: pointer to the ethernet header inside the coded packet + * @coded: coded packet we try to find decode data for + * + * Returns pointer to nc packet if the needed data was found or NULL otherwise. + */ +static struct batadv_nc_packet * +batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, + struct ethhdr *ethhdr, + struct batadv_coded_packet *coded) +{ + struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; + struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; + struct batadv_nc_path *nc_path, nc_path_key; + uint8_t *dest, *source; + __be32 packet_id; + int index; + + if (!hash) + return NULL; + + /* Select the correct packet id based on the location of our mac-addr */ + dest = ethhdr->h_source; + if (!batadv_is_my_mac(coded->second_dest)) { + source = coded->second_source; + packet_id = coded->second_crc; + } else { + source = coded->first_source; + packet_id = coded->first_crc; + } + + batadv_nc_hash_key_gen(&nc_path_key, source, dest); + index = batadv_nc_hash_choose(&nc_path_key, hash->size); + + /* Search for matching coding path */ + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { + /* Find matching nc_packet */ + spin_lock_bh(&nc_path->packet_list_lock); + list_for_each_entry(tmp_nc_packet, + &nc_path->packet_list, list) { + if (packet_id == tmp_nc_packet->packet_id) { + list_del(&tmp_nc_packet->list); + + nc_packet = tmp_nc_packet; + break; + } + } + spin_unlock_bh(&nc_path->packet_list_lock); + + if (nc_packet) + break; + } + rcu_read_unlock(); + + if (!nc_packet) + batadv_dbg(BATADV_DBG_NC, bat_priv, + "No decoding packet found for %u\n", packet_id); + + return nc_packet; +} + +/** + * batadv_nc_recv_coded_packet - try to decode coded packet and enqueue the + * resulting unicast packet + * @skb: incoming coded packet + * @recv_if: pointer to interface this packet was received on + */ +static int batadv_nc_recv_coded_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_packet *unicast_packet; + struct batadv_coded_packet *coded_packet; + struct batadv_nc_packet *nc_packet; + struct ethhdr *ethhdr; + int hdr_size = sizeof(*coded_packet); + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + return NET_RX_DROP; + + /* Make sure we can access (and remove) header */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return NET_RX_DROP; + + coded_packet = (struct batadv_coded_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* Verify frame is destined for us */ + if (!batadv_is_my_mac(ethhdr->h_dest) && + !batadv_is_my_mac(coded_packet->second_dest)) + return NET_RX_DROP; + + /* Update stat counter */ + if (batadv_is_my_mac(coded_packet->second_dest)) + batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED); + + nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr, + coded_packet); + if (!nc_packet) { + batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); + return NET_RX_DROP; + } + + /* Make skb's linear, because decoding accesses the entire buffer */ + if (skb_linearize(skb) < 0) + goto free_nc_packet; + + if (skb_linearize(nc_packet->skb) < 0) + goto free_nc_packet; + + /* Decode the packet */ + unicast_packet = batadv_nc_skb_decode_packet(skb, nc_packet); + if (!unicast_packet) { + batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); + goto free_nc_packet; + } + + /* Mark packet as decoded to do correct recoding when forwarding */ + BATADV_SKB_CB(skb)->decoded = true; + batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES, + skb->len + ETH_HLEN); + return batadv_recv_unicast_packet(skb, recv_if); + +free_nc_packet: + batadv_nc_packet_free(nc_packet); + return NET_RX_DROP; +} + +/** + * batadv_nc_free - clean up network coding memory + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_nc_free(struct batadv_priv *bat_priv) +{ + batadv_recv_handler_unregister(BATADV_CODED); + cancel_delayed_work_sync(&bat_priv->nc.work); + + batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); + batadv_hash_destroy(bat_priv->nc.coding_hash); + batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); + batadv_hash_destroy(bat_priv->nc.decoding_hash); +} + +/** + * batadv_nc_nodes_seq_print_text - print the nc node information + * @seq: seq file to print on + * @offset: not used + */ +int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct batadv_priv *bat_priv = netdev_priv(net_dev); + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hard_iface *primary_if; + struct hlist_head *head; + struct batadv_orig_node *orig_node; + struct batadv_nc_node *nc_node; + int i; + + primary_if = batadv_seq_print_text_primary_if_get(seq); + if (!primary_if) + goto out; + + /* Traverse list of originators */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + /* For each orig_node in this bin */ + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + seq_printf(seq, "Node: %pM\n", orig_node->orig); + + seq_puts(seq, " Ingoing: "); + /* For each in_nc_node to this orig_node */ + list_for_each_entry_rcu(nc_node, + &orig_node->in_coding_list, + list) + seq_printf(seq, "%pM ", + nc_node->addr); + seq_puts(seq, "\n"); + + seq_puts(seq, " Outgoing: "); + /* For out_nc_node to this orig_node */ + list_for_each_entry_rcu(nc_node, + &orig_node->out_coding_list, + list) + seq_printf(seq, "%pM ", + nc_node->addr); + seq_puts(seq, "\n\n"); + } + rcu_read_unlock(); + } + +out: + if (primary_if) + batadv_hardif_free_ref(primary_if); + return 0; +} + +/** + * batadv_nc_init_debugfs - create nc folder and related files in debugfs + * @bat_priv: the bat priv with all the soft interface information + */ +int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) +{ + struct dentry *nc_dir, *file; + + nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir); + if (!nc_dir) + goto out; + + file = debugfs_create_u8("min_tq", S_IRUGO | S_IWUSR, nc_dir, + &bat_priv->nc.min_tq); + if (!file) + goto out; + + file = debugfs_create_u32("max_fwd_delay", S_IRUGO | S_IWUSR, nc_dir, + &bat_priv->nc.max_fwd_delay); + if (!file) + goto out; + + file = debugfs_create_u32("max_buffer_time", S_IRUGO | S_IWUSR, nc_dir, + &bat_priv->nc.max_buffer_time); + if (!file) + goto out; + + return 0; + +out: + return -ENOMEM; +} diff --git a/net/batman-adv/network-coding.h b/net/batman-adv/network-coding.h new file mode 100644 index 000000000000..4fa6d0caddbd --- /dev/null +++ b/net/batman-adv/network-coding.h @@ -0,0 +1,123 @@ +/* Copyright (C) 2012-2013 B.A.T.M.A.N. contributors: + * + * Martin Hundebøll, Jeppe Ledet-Pedersen + * + * 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 + */ + +#ifndef _NET_BATMAN_ADV_NETWORK_CODING_H_ +#define _NET_BATMAN_ADV_NETWORK_CODING_H_ + +#ifdef CONFIG_BATMAN_ADV_NC + +int batadv_nc_init(struct batadv_priv *bat_priv); +void batadv_nc_free(struct batadv_priv *bat_priv); +void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *ogm_packet, + int is_single_hop_neigh); +void batadv_nc_purge_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)); +void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv); +void batadv_nc_init_orig(struct batadv_orig_node *orig_node); +bool batadv_nc_skb_forward(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node, + struct ethhdr *ethhdr); +void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, + struct sk_buff *skb); +void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb); +int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset); +int batadv_nc_init_debugfs(struct batadv_priv *bat_priv); + +#else /* ifdef CONFIG_BATMAN_ADV_NC */ + +static inline int batadv_nc_init(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline void batadv_nc_free(struct batadv_priv *bat_priv) +{ + return; +} + +static inline void +batadv_nc_update_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *ogm_packet, + int is_single_hop_neigh) +{ + return; +} + +static inline void +batadv_nc_purge_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)) +{ + return; +} + +static inline void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) +{ + return; +} + +static inline void batadv_nc_init_orig(struct batadv_orig_node *orig_node) +{ + return; +} + +static inline bool batadv_nc_skb_forward(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node, + struct ethhdr *ethhdr) +{ + return false; +} + +static inline void +batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return; +} + +static inline void +batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return; +} + +static inline int batadv_nc_nodes_seq_print_text(struct seq_file *seq, + void *offset) +{ + return 0; +} + +static inline int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) +{ + return 0; +} + +#endif /* ifdef CONFIG_BATMAN_ADV_NC */ + +#endif /* _NET_BATMAN_ADV_NETWORK_CODING_H_ */ diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index 96fb80b724dc..2f3452546636 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -28,6 +28,7 @@ #include "unicast.h" #include "soft-interface.h" #include "bridge_loop_avoidance.h" +#include "network-coding.h" /* hash class keys */ static struct lock_class_key batadv_orig_hash_lock_class_key; @@ -142,6 +143,9 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu) spin_unlock_bh(&orig_node->neigh_list_lock); + /* Free nc_nodes */ + batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL); + batadv_frag_list_free(&orig_node->frag_list); batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, "originator timed out"); @@ -219,6 +223,8 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, spin_lock_init(&orig_node->neigh_list_lock); spin_lock_init(&orig_node->tt_buff_lock); + batadv_nc_init_orig(orig_node); + /* extra reference for return */ atomic_set(&orig_node->refcount, 2); @@ -459,7 +465,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) neigh_node_tmp->tq_avg); } - seq_printf(seq, "\n"); + seq_puts(seq, "\n"); batman_count++; next: @@ -469,7 +475,7 @@ next: } if (batman_count == 0) - seq_printf(seq, "No batman nodes in range ...\n"); + seq_puts(seq, "No batman nodes in range ...\n"); out: if (primary_if) diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h index ed0aa89bbf8b..a51ccfc39da4 100644 --- a/net/batman-adv/packet.h +++ b/net/batman-adv/packet.h @@ -30,6 +30,7 @@ enum batadv_packettype { BATADV_TT_QUERY = 0x07, BATADV_ROAM_ADV = 0x08, BATADV_UNICAST_4ADDR = 0x09, + BATADV_CODED = 0x0a, }; /** @@ -278,4 +279,36 @@ struct batadv_tt_change { uint8_t addr[ETH_ALEN]; } __packed; +/** + * struct batadv_coded_packet - network coded packet + * @header: common batman packet header and ttl of first included packet + * @reserved: Align following fields to 2-byte boundaries + * @first_source: original source of first included packet + * @first_orig_dest: original destinal of first included packet + * @first_crc: checksum of first included packet + * @first_ttvn: tt-version number of first included packet + * @second_ttl: ttl of second packet + * @second_dest: second receiver of this coded packet + * @second_source: original source of second included packet + * @second_orig_dest: original destination of second included packet + * @second_crc: checksum of second included packet + * @second_ttvn: tt version number of second included packet + * @coded_len: length of network coded part of the payload + */ +struct batadv_coded_packet { + struct batadv_header header; + uint8_t first_ttvn; + /* uint8_t first_dest[ETH_ALEN]; - saved in mac header destination */ + uint8_t first_source[ETH_ALEN]; + uint8_t first_orig_dest[ETH_ALEN]; + __be32 first_crc; + uint8_t second_ttl; + uint8_t second_ttvn; + uint8_t second_dest[ETH_ALEN]; + uint8_t second_source[ETH_ALEN]; + uint8_t second_orig_dest[ETH_ALEN]; + __be32 second_crc; + __be16 coded_len; +}; + #endif /* _NET_BATMAN_ADV_PACKET_H_ */ diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 5ee21cebbbb0..8f88967ff14b 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -29,6 +29,7 @@ #include "unicast.h" #include "bridge_loop_avoidance.h" #include "distributed-arp-table.h" +#include "network-coding.h" static int batadv_route_unicast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if); @@ -548,27 +549,37 @@ batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, return router; } +/** + * batadv_check_unicast_packet - Check for malformed unicast packets + * @skb: packet to check + * @hdr_size: size of header to pull + * + * Check for short header and bad addresses in given packet. Returns negative + * value when check fails and 0 otherwise. The negative value depends on the + * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, + * and -EREMOTE for non-local (other host) destination. + */ static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size) { struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) - return -1; + return -ENODATA; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) - return -1; + return -EBADR; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) - return -1; + return -EBADR; /* not for me */ if (!batadv_is_my_mac(ethhdr->h_dest)) - return -1; + return -EREMOTE; return 0; } @@ -850,15 +861,18 @@ static int batadv_route_unicast_packet(struct sk_buff *skb, /* decrement ttl */ unicast_packet->header.ttl--; - /* Update stats counter */ - batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); - batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, - skb->len + ETH_HLEN); - - /* route it */ - if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) + /* network code packet if possible */ + if (batadv_nc_skb_forward(skb, neigh_node, ethhdr)) { + ret = NET_RX_SUCCESS; + } else if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) { ret = NET_RX_SUCCESS; + /* Update stats counter */ + batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); + batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, + skb->len + ETH_HLEN); + } + out: if (neigh_node) batadv_neigh_node_free_ref(neigh_node); @@ -1033,7 +1047,7 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, struct batadv_unicast_4addr_packet *unicast_4addr_packet; uint8_t *orig_addr; struct batadv_orig_node *orig_node = NULL; - int hdr_size = sizeof(*unicast_packet); + int check, hdr_size = sizeof(*unicast_packet); bool is4addr; unicast_packet = (struct batadv_unicast_packet *)skb->data; @@ -1044,7 +1058,16 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, if (is4addr) hdr_size = sizeof(*unicast_4addr_packet); - if (batadv_check_unicast_packet(skb, hdr_size) < 0) + /* function returns -EREMOTE for promiscuous packets */ + check = batadv_check_unicast_packet(skb, hdr_size); + + /* Even though the packet is not for us, we might save it to use for + * decoding a later received coded packet + */ + if (check == -EREMOTE) + batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); + + if (check < 0) return NET_RX_DROP; if (!batadv_check_unicast_ttvn(bat_priv, skb)) diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index a67cffde37ae..263cfd1ccee7 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -27,6 +27,7 @@ #include "vis.h" #include "gateway_common.h" #include "originator.h" +#include "network-coding.h" #include <linux/if_ether.h> @@ -39,6 +40,7 @@ int batadv_send_skb_packet(struct sk_buff *skb, struct batadv_hard_iface *hard_iface, const uint8_t *dst_addr) { + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct ethhdr *ethhdr; if (hard_iface->if_status != BATADV_IF_ACTIVE) @@ -70,6 +72,9 @@ int batadv_send_skb_packet(struct sk_buff *skb, skb->dev = hard_iface->net_dev; + /* Save a clone of the skb to use when decoding coded packets */ + batadv_nc_skb_store_for_decoding(bat_priv, skb); + /* dev_queue_xmit() returns a negative result on error. However on * congestion and traffic shaping, it drops and returns NET_XMIT_DROP * (which is > 0). This will not be treated as an error. diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 2711e870f557..403b8c46085e 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -37,6 +37,7 @@ #include <linux/if_ether.h> #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); @@ -401,55 +402,6 @@ static void batadv_set_lockdep_class(struct net_device *dev) } /** - * batadv_softif_init - Late stage initialization of soft interface - * @dev: registered network device to modify - * - * Returns error code on failures - */ -static int batadv_softif_init(struct net_device *dev) -{ - batadv_set_lockdep_class(dev); - - return 0; -} - -static const struct net_device_ops batadv_netdev_ops = { - .ndo_init = batadv_softif_init, - .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 -}; - -static void batadv_interface_setup(struct net_device *dev) -{ - struct batadv_priv *priv = netdev_priv(dev); - - ether_setup(dev); - - dev->netdev_ops = &batadv_netdev_ops; - dev->destructor = free_netdev; - 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)); -} - -/** * batadv_softif_destroy_finish - cleans up the remains of a softif * @work: work queue item * @@ -465,7 +417,6 @@ static void batadv_softif_destroy_finish(struct work_struct *work) cleanup_work); soft_iface = bat_priv->soft_iface; - batadv_debugfs_del_meshif(soft_iface); batadv_sysfs_del_meshif(soft_iface); rtnl_lock(); @@ -473,21 +424,22 @@ static void batadv_softif_destroy_finish(struct work_struct *work) rtnl_unlock(); } -struct net_device *batadv_softif_create(const char *name) +/** + * 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 net_device *soft_iface; struct batadv_priv *bat_priv; int ret; size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM; - soft_iface = alloc_netdev(sizeof(*bat_priv), name, - batadv_interface_setup); - - if (!soft_iface) - goto out; + batadv_set_lockdep_class(dev); - bat_priv = netdev_priv(soft_iface); - bat_priv->soft_iface = soft_iface; + 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 @@ -495,14 +447,7 @@ struct net_device *batadv_softif_create(const char *name) */ bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t)); if (!bat_priv->bat_counters) - goto free_soft_iface; - - ret = register_netdevice(soft_iface); - if (ret < 0) { - pr_err("Unable to register the batman interface '%s': %i\n", - name, ret); - goto free_bat_counters; - } + return -ENOMEM; atomic_set(&bat_priv->aggregated_ogms, 1); atomic_set(&bat_priv->bonding, 0); @@ -540,49 +485,189 @@ struct net_device *batadv_softif_create(const char *name) bat_priv->primary_if = NULL; bat_priv->num_ifaces = 0; - ret = batadv_algo_select(bat_priv, batadv_routing_algo); - if (ret < 0) - goto unreg_soft_iface; + batadv_nc_init_bat_priv(bat_priv); - ret = batadv_sysfs_add_meshif(soft_iface); + ret = batadv_algo_select(bat_priv, batadv_routing_algo); if (ret < 0) - goto unreg_soft_iface; + goto free_bat_counters; - ret = batadv_debugfs_add_meshif(soft_iface); + ret = batadv_debugfs_add_meshif(dev); if (ret < 0) - goto unreg_sysfs; + goto free_bat_counters; - ret = batadv_mesh_init(soft_iface); + ret = batadv_mesh_init(dev); if (ret < 0) goto unreg_debugfs; - return soft_iface; + return 0; unreg_debugfs: - batadv_debugfs_del_meshif(soft_iface); -unreg_sysfs: - batadv_sysfs_del_meshif(soft_iface); -unreg_soft_iface: - free_percpu(bat_priv->bat_counters); - unregister_netdevice(soft_iface); - return NULL; - + batadv_debugfs_del_meshif(dev); free_bat_counters: free_percpu(bat_priv->bat_counters); -free_soft_iface: - free_netdev(soft_iface); + + return ret; +} + +/** + * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface + * @dev: batadv_soft_interface used as master interface + * @slave_dev: net_device which should become the slave interface + * + * Return 0 if successful or error otherwise. + */ +static int batadv_softif_slave_add(struct net_device *dev, + struct net_device *slave_dev) +{ + struct batadv_hard_iface *hard_iface; + int ret = -EINVAL; + + hard_iface = batadv_hardif_get_by_netdev(slave_dev); + if (!hard_iface || hard_iface->soft_iface != NULL) + goto out; + + ret = batadv_hardif_enable_interface(hard_iface, dev->name); + out: - return NULL; + if (hard_iface) + batadv_hardif_free_ref(hard_iface); + return ret; } -void batadv_softif_destroy(struct net_device *soft_iface) +/** + * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface + * @dev: batadv_soft_interface used as master interface + * @slave_dev: net_device which should be removed from the master interface + * + * Return 0 if successful or error otherwise. + */ +static int batadv_softif_slave_del(struct net_device *dev, + struct net_device *slave_dev) +{ + struct batadv_hard_iface *hard_iface; + int ret = -EINVAL; + + hard_iface = batadv_hardif_get_by_netdev(slave_dev); + + if (!hard_iface || hard_iface->soft_iface != dev) + goto out; + + batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); + ret = 0; + +out: + if (hard_iface) + batadv_hardif_free_ref(hard_iface); + 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, + .ndo_add_slave = batadv_softif_slave_add, + .ndo_del_slave = batadv_softif_slave_del, +}; + +/** + * 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; + + soft_iface->rtnl_link_ops = &batadv_link_ops; + + 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); - batadv_mesh_free(soft_iface); queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); } +/** + * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink + * @soft_iface: the to-be-removed batman-adv interface + * @head: list pointer + */ +static void batadv_softif_destroy_netlink(struct net_device *soft_iface, + struct list_head *head) +{ + struct batadv_hard_iface *hard_iface; + + list_for_each_entry(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface == soft_iface) + batadv_hardif_disable_interface(hard_iface, + BATADV_IF_CLEANUP_KEEP); + } + + batadv_sysfs_del_meshif(soft_iface); + unregister_netdevice_queue(soft_iface, head); +} + int batadv_softif_is_valid(const struct net_device *net_dev) { if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) @@ -591,6 +676,13 @@ int batadv_softif_is_valid(const struct net_device *net_dev) return 0; } +struct rtnl_link_ops batadv_link_ops __read_mostly = { + .kind = "batadv", + .priv_size = sizeof(struct batadv_priv), + .setup = batadv_softif_init_early, + .dellink = batadv_softif_destroy_netlink, +}; + /* ethtool */ static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { @@ -662,6 +754,17 @@ static const struct { { "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, diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h index 43182e5e603a..2f2472c2ea0d 100644 --- a/net/batman-adv/soft-interface.h +++ b/net/batman-adv/soft-interface.h @@ -25,7 +25,8 @@ 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 net_device *batadv_softif_create(const char *name); -void batadv_softif_destroy(struct net_device *soft_iface); +void batadv_softif_destroy_sysfs(struct net_device *soft_iface); int batadv_softif_is_valid(const struct net_device *net_dev); +extern struct rtnl_link_ops batadv_link_ops; #endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */ diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index afbba319d73a..15a22efa9a67 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -442,6 +442,9 @@ static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth, #ifdef CONFIG_BATMAN_ADV_DEBUG BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL); #endif +#ifdef CONFIG_BATMAN_ADV_NC +BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR, NULL); +#endif static struct batadv_attribute *batadv_mesh_attrs[] = { &batadv_attr_aggregated_ogms, @@ -464,6 +467,9 @@ static struct batadv_attribute *batadv_mesh_attrs[] = { #ifdef CONFIG_BATMAN_ADV_DEBUG &batadv_attr_log_level, #endif +#ifdef CONFIG_BATMAN_ADV_NC + &batadv_attr_network_coding, +#endif NULL, }; @@ -582,13 +588,15 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj, } if (status_tmp == BATADV_IF_NOT_IN_USE) { - batadv_hardif_disable_interface(hard_iface); + batadv_hardif_disable_interface(hard_iface, + BATADV_IF_CLEANUP_AUTO); goto unlock; } /* if the interface already is in use */ if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) - batadv_hardif_disable_interface(hard_iface); + batadv_hardif_disable_interface(hard_iface, + BATADV_IF_CLEANUP_AUTO); ret = batadv_hardif_enable_interface(hard_iface, buff); @@ -688,15 +696,10 @@ int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, enum batadv_uev_action action, const char *data) { int ret = -ENOMEM; - struct batadv_hard_iface *primary_if; struct kobject *bat_kobj; char *uevent_env[4] = { NULL, NULL, NULL, NULL }; - primary_if = batadv_primary_if_get_selected(bat_priv); - if (!primary_if) - goto out; - - bat_kobj = &primary_if->soft_iface->dev.kobj; + bat_kobj = &bat_priv->soft_iface->dev.kobj; uevent_env[0] = kmalloc(strlen(BATADV_UEV_TYPE_VAR) + strlen(batadv_uev_type_str[type]) + 1, @@ -732,9 +735,6 @@ out: kfree(uevent_env[1]); kfree(uevent_env[2]); - if (primary_if) - batadv_hardif_free_ref(primary_if); - if (ret) batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 98a66a021a60..932232087449 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -385,25 +385,19 @@ static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, int *packet_buff_len, int min_packet_len) { - struct batadv_hard_iface *primary_if; int req_len; - primary_if = batadv_primary_if_get_selected(bat_priv); - req_len = min_packet_len; req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); /* if we have too many changes for one packet don't send any * and wait for the tt table request which will be fragmented */ - if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) + if (req_len > bat_priv->soft_iface->mtu) req_len = min_packet_len; batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, min_packet_len, req_len); - - if (primary_if) - batadv_hardif_free_ref(primary_if); } static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, @@ -908,7 +902,7 @@ out_remove: /* remove address from local hash if present */ local_flags = batadv_tt_local_remove(bat_priv, tt_addr, "global tt received", - !!(flags & BATADV_TT_CLIENT_ROAM)); + flags & BATADV_TT_CLIENT_ROAM); tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; if (!(flags & BATADV_TT_CLIENT_ROAM)) @@ -1580,7 +1574,7 @@ static int batadv_tt_global_valid(const void *entry_ptr, static struct sk_buff * batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, struct batadv_hashtable *hash, - struct batadv_hard_iface *primary_if, + struct batadv_priv *bat_priv, int (*valid_cb)(const void *, const void *), void *cb_data) { @@ -1594,8 +1588,8 @@ batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, uint32_t i; size_t len; - if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { - tt_len = primary_if->soft_iface->mtu - tt_query_size; + if (tt_query_size + tt_len > bat_priv->soft_iface->mtu) { + tt_len = bat_priv->soft_iface->mtu - tt_query_size; tt_len -= tt_len % sizeof(struct batadv_tt_change); } tt_tot = tt_len / sizeof(struct batadv_tt_change); @@ -1715,7 +1709,6 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv, { struct batadv_orig_node *req_dst_orig_node; struct batadv_orig_node *res_dst_orig_node = NULL; - struct batadv_hard_iface *primary_if = NULL; uint8_t orig_ttvn, req_ttvn, ttvn; int ret = false; unsigned char *tt_buff; @@ -1740,10 +1733,6 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv, if (!res_dst_orig_node) goto out; - primary_if = batadv_primary_if_get_selected(bat_priv); - if (!primary_if) - goto out; - orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); req_ttvn = tt_request->ttvn; @@ -1791,7 +1780,7 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv, skb = batadv_tt_response_fill_table(tt_len, ttvn, bat_priv->tt.global_hash, - primary_if, + bat_priv, batadv_tt_global_valid, req_dst_orig_node); if (!skb) @@ -1828,8 +1817,6 @@ out: batadv_orig_node_free_ref(res_dst_orig_node); if (req_dst_orig_node) batadv_orig_node_free_ref(req_dst_orig_node); - if (primary_if) - batadv_hardif_free_ref(primary_if); if (!ret) kfree_skb(skb); return ret; @@ -1907,7 +1894,7 @@ batadv_send_my_tt_response(struct batadv_priv *bat_priv, skb = batadv_tt_response_fill_table(tt_len, ttvn, bat_priv->tt.local_hash, - primary_if, + bat_priv, batadv_tt_local_valid_entry, NULL); if (!skb) @@ -2528,7 +2515,7 @@ bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, if (!tt_global_entry) goto out; - ret = !!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM); + ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; batadv_tt_global_entry_free_ref(tt_global_entry); out: return ret; diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 4cd87a0b5b80..aba8364c3689 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -128,6 +128,10 @@ struct batadv_hard_iface { * @bond_list: list of bonding candidates * @refcount: number of contexts the object is used * @rcu: struct used for freeing in an RCU-safe manner + * @in_coding_list: list of nodes this orig can hear + * @out_coding_list: list of nodes that can hear this orig + * @in_coding_list_lock: protects in_coding_list + * @out_coding_list_lock: protects out_coding_list */ struct batadv_orig_node { uint8_t orig[ETH_ALEN]; @@ -171,6 +175,12 @@ struct batadv_orig_node { struct list_head bond_list; atomic_t refcount; struct rcu_head rcu; +#ifdef CONFIG_BATMAN_ADV_NC + struct list_head in_coding_list; + struct list_head out_coding_list; + spinlock_t in_coding_list_lock; /* Protects in_coding_list */ + spinlock_t out_coding_list_lock; /* Protects out_coding_list */ +#endif }; /** @@ -265,6 +275,17 @@ struct batadv_bcast_duplist_entry { * @BATADV_CNT_DAT_PUT_RX: received dht PUT traffic packet counter * @BATADV_CNT_DAT_CACHED_REPLY_TX: transmitted dat cache reply traffic packet * counter + * @BATADV_CNT_NC_CODE: transmitted nc-combined traffic packet counter + * @BATADV_CNT_NC_CODE_BYTES: transmitted nc-combined traffic bytes counter + * @BATADV_CNT_NC_RECODE: transmitted nc-recombined traffic packet counter + * @BATADV_CNT_NC_RECODE_BYTES: transmitted nc-recombined traffic bytes counter + * @BATADV_CNT_NC_BUFFER: counter for packets buffered for later nc decoding + * @BATADV_CNT_NC_DECODE: received and nc-decoded traffic packet counter + * @BATADV_CNT_NC_DECODE_BYTES: received and nc-decoded traffic bytes counter + * @BATADV_CNT_NC_DECODE_FAILED: received and decode-failed traffic packet + * counter + * @BATADV_CNT_NC_SNIFFED: counter for nc-decoded packets received in promisc + * mode. * @BATADV_CNT_NUM: number of traffic counters */ enum batadv_counters { @@ -292,6 +313,17 @@ enum batadv_counters { BATADV_CNT_DAT_PUT_RX, BATADV_CNT_DAT_CACHED_REPLY_TX, #endif +#ifdef CONFIG_BATMAN_ADV_NC + BATADV_CNT_NC_CODE, + BATADV_CNT_NC_CODE_BYTES, + BATADV_CNT_NC_RECODE, + BATADV_CNT_NC_RECODE_BYTES, + BATADV_CNT_NC_BUFFER, + BATADV_CNT_NC_DECODE, + BATADV_CNT_NC_DECODE_BYTES, + BATADV_CNT_NC_DECODE_FAILED, + BATADV_CNT_NC_SNIFFED, +#endif BATADV_CNT_NUM, }; @@ -428,6 +460,35 @@ struct batadv_priv_dat { #endif /** + * struct batadv_priv_nc - per mesh interface network coding private data + * @work: work queue callback item for cleanup + * @debug_dir: dentry for nc subdir in batman-adv directory in debugfs + * @min_tq: only consider neighbors for encoding if neigh_tq > min_tq + * @max_fwd_delay: maximum packet forward delay to allow coding of packets + * @max_buffer_time: buffer time for sniffed packets used to decoding + * @timestamp_fwd_flush: timestamp of last forward packet queue flush + * @timestamp_sniffed_purge: timestamp of last sniffed packet queue purge + * @coding_hash: Hash table used to buffer skbs while waiting for another + * incoming skb to code it with. Skbs are added to the buffer just before being + * forwarded in routing.c + * @decoding_hash: Hash table used to buffer skbs that might be needed to decode + * a received coded skb. The buffer is used for 1) skbs arriving on the + * soft-interface; 2) skbs overheard on the hard-interface; and 3) skbs + * forwarded by batman-adv. + */ +struct batadv_priv_nc { + struct delayed_work work; + struct dentry *debug_dir; + u8 min_tq; + u32 max_fwd_delay; + u32 max_buffer_time; + unsigned long timestamp_fwd_flush; + unsigned long timestamp_sniffed_purge; + struct batadv_hashtable *coding_hash; + struct batadv_hashtable *decoding_hash; +}; + +/** * struct batadv_priv - per mesh interface data * @mesh_state: current status of the mesh (inactive/active/deactivating) * @soft_iface: net device which holds this struct as private data @@ -470,6 +531,8 @@ struct batadv_priv_dat { * @tt: translation table data * @vis: vis data * @dat: distributed arp table data + * @network_coding: bool indicating whether network coding is enabled + * @batadv_priv_nc: network coding data */ struct batadv_priv { atomic_t mesh_state; @@ -522,6 +585,10 @@ struct batadv_priv { #ifdef CONFIG_BATMAN_ADV_DAT struct batadv_priv_dat dat; #endif +#ifdef CONFIG_BATMAN_ADV_NC + atomic_t network_coding; + struct batadv_priv_nc nc; +#endif /* CONFIG_BATMAN_ADV_NC */ }; /** @@ -702,6 +769,75 @@ struct batadv_tt_roam_node { }; /** + * struct batadv_nc_node - network coding node + * @list: next and prev pointer for the list handling + * @addr: the node's mac address + * @refcount: number of contexts the object is used by + * @rcu: struct used for freeing in an RCU-safe manner + * @orig_node: pointer to corresponding orig node struct + * @last_seen: timestamp of last ogm received from this node + */ +struct batadv_nc_node { + struct list_head list; + uint8_t addr[ETH_ALEN]; + atomic_t refcount; + struct rcu_head rcu; + struct batadv_orig_node *orig_node; + unsigned long last_seen; +}; + +/** + * struct batadv_nc_path - network coding path + * @hash_entry: next and prev pointer for the list handling + * @rcu: struct used for freeing in an RCU-safe manner + * @refcount: number of contexts the object is used by + * @packet_list: list of buffered packets for this path + * @packet_list_lock: access lock for packet list + * @next_hop: next hop (destination) of path + * @prev_hop: previous hop (source) of path + * @last_valid: timestamp for last validation of path + */ +struct batadv_nc_path { + struct hlist_node hash_entry; + struct rcu_head rcu; + atomic_t refcount; + struct list_head packet_list; + spinlock_t packet_list_lock; /* Protects packet_list */ + uint8_t next_hop[ETH_ALEN]; + uint8_t prev_hop[ETH_ALEN]; + unsigned long last_valid; +}; + +/** + * struct batadv_nc_packet - network coding packet used when coding and + * decoding packets + * @list: next and prev pointer for the list handling + * @packet_id: crc32 checksum of skb data + * @timestamp: field containing the info when the packet was added to path + * @neigh_node: pointer to original next hop neighbor of skb + * @skb: skb which can be encoded or used for decoding + * @nc_path: pointer to path this nc packet is attached to + */ +struct batadv_nc_packet { + struct list_head list; + __be32 packet_id; + unsigned long timestamp; + struct batadv_neigh_node *neigh_node; + struct sk_buff *skb; + struct batadv_nc_path *nc_path; +}; + +/** + * batadv_skb_cb - control buffer structure used to store private data relevant + * to batman-adv in the skb->cb buffer in skbs. + * @decoded: Marks a skb as decoded, which is checked when searching for coding + * opportunities in network-coding.c + */ +struct batadv_skb_cb { + bool decoded; +}; + +/** * struct batadv_forw_packet - structure for bcast packets to be sent/forwarded * @list: list node for batadv_socket_client::queue_list * @send_time: execution time for delayed_work (packet sending) diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c index 50e079f00be6..0bb3b5982f94 100644 --- a/net/batman-adv/unicast.c +++ b/net/batman-adv/unicast.c @@ -122,7 +122,7 @@ batadv_frag_search_packet(struct list_head *head, { struct batadv_frag_packet_list_entry *tfp; struct batadv_unicast_frag_packet *tmp_up = NULL; - int is_head_tmp, is_head; + bool is_head_tmp, is_head; uint16_t search_seqno; if (up->flags & BATADV_UNI_FRAG_HEAD) @@ -130,7 +130,7 @@ batadv_frag_search_packet(struct list_head *head, else search_seqno = ntohs(up->seqno)-1; - is_head = !!(up->flags & BATADV_UNI_FRAG_HEAD); + is_head = up->flags & BATADV_UNI_FRAG_HEAD; list_for_each_entry(tfp, head, list) { if (!tfp->skb) @@ -142,7 +142,7 @@ batadv_frag_search_packet(struct list_head *head, tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data; if (tfp->seqno == search_seqno) { - is_head_tmp = !!(tmp_up->flags & BATADV_UNI_FRAG_HEAD); + is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD; if (is_head_tmp != is_head) return tfp; else diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c index c053244b97bd..962ccf3b8382 100644 --- a/net/batman-adv/vis.c +++ b/net/batman-adv/vis.c @@ -149,7 +149,7 @@ static void batadv_vis_data_read_prim_sec(struct seq_file *seq, hlist_for_each_entry(entry, if_list, list) { if (entry->primary) - seq_printf(seq, "PRIMARY, "); + seq_puts(seq, "PRIMARY, "); else seq_printf(seq, "SEC %pM, ", entry->addr); } @@ -207,7 +207,7 @@ static void batadv_vis_data_read_entries(struct seq_file *seq, if (batadv_compare_eth(entry->addr, packet->vis_orig)) batadv_vis_data_read_prim_sec(seq, list); - seq_printf(seq, "\n"); + seq_puts(seq, "\n"); } } |