The following commit has been merged in the merge/master branch: commit 2c2fe0ba9ea57500a7088e8b087fc1bf2f5cbeb1 Author: Linus Luessing linus.luessing@web.de Date: Sat Jan 16 16:40:10 2016 +0800

batman-adv: ELP - creating neighbor structures

Initially developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG.

Signed-off-by: Linus Luessing linus.luessing@web.de Signed-off-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Antonio Quartulli antonio@open-mesh.com Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

diff --git a/compat-include/linux/average.h b/compat-include/linux/average.h new file mode 100644 index 0000000..e5a2bf5 --- /dev/null +++ b/compat-include/linux/average.h @@ -0,0 +1,74 @@ +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see http://www.gnu.org/licenses/. + * + * This file contains macros for maintaining compatibility with older versions + * of the Linux kernel. + */ + +#ifndef _NET_BATMAN_ADV_COMPAT_LINUX_AVERAGE_H +#define _NET_BATMAN_ADV_COMPAT_LINUX_AVERAGE_H + +#include <linux/version.h> +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38) +#include_next <linux/average.h> +#endif + +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) + +/* Exponentially weighted moving average (EWMA) */ + +#define DECLARE_EWMA(name, _factor, _weight) \ + struct ewma_##name { \ + unsigned long internal; \ + }; \ + static inline void ewma_##name##_init(struct ewma_##name *e) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_factor)); \ + BUILD_BUG_ON(!__builtin_constant_p(_weight)); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \ + e->internal = 0; \ + } \ + static inline unsigned long \ + ewma_##name##_read(struct ewma_##name *e) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_factor)); \ + BUILD_BUG_ON(!__builtin_constant_p(_weight)); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \ + return e->internal >> ilog2(_factor); \ + } \ + static inline void ewma_##name##_add(struct ewma_##name *e, \ + unsigned long val) \ + { \ + unsigned long internal = ACCESS_ONCE(e->internal); \ + unsigned long weight = ilog2(_weight); \ + unsigned long factor = ilog2(_factor); \ + \ + BUILD_BUG_ON(!__builtin_constant_p(_factor)); \ + BUILD_BUG_ON(!__builtin_constant_p(_weight)); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \ + \ + ACCESS_ONCE(e->internal) = internal ? \ + (((internal << weight) - internal) + \ + (val << factor)) >> weight : \ + (val << factor); \ + } + +#endif /* < KERNEL_VERSION(4, 3, 0) */ + +#endif /* _NET_BATMAN_ADV_COMPAT_LINUX_AVERAGE_H */ diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index 01327f6..0fea8948 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -22,6 +22,7 @@ #include <linux/init.h>

#include "bat_v_elp.h" +#include "packet.h"

static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface) { @@ -42,6 +43,12 @@ static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface) batadv_v_elp_primary_iface_set(hard_iface); }

+static void +batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh) +{ + ewma_throughput_init(&hardif_neigh->bat_v.throughput); +} + static void batadv_v_ogm_schedule(struct batadv_hard_iface *hard_iface) { } @@ -56,6 +63,7 @@ static struct batadv_algo_ops batadv_batman_v __read_mostly = { .bat_iface_disable = batadv_v_iface_disable, .bat_iface_update_mac = batadv_v_iface_update_mac, .bat_primary_iface_set = batadv_v_primary_iface_set, + .bat_hardif_neigh_init = batadv_v_hardif_neigh_init, .bat_ogm_emit = batadv_v_ogm_emit, .bat_ogm_schedule = batadv_v_ogm_schedule, }; @@ -70,5 +78,18 @@ static struct batadv_algo_ops batadv_batman_v __read_mostly = { */ int __init batadv_v_init(void) { - return batadv_algo_register(&batadv_batman_v); + int ret; + + /* B.A.T.M.A.N. V echo location protocol packet */ + ret = batadv_recv_handler_register(BATADV_ELP, + batadv_v_elp_packet_recv); + if (ret < 0) + return ret; + + ret = batadv_algo_register(&batadv_batman_v); + + if (ret < 0) + batadv_recv_handler_unregister(BATADV_ELP); + + return ret; } diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c index bc6e046..dac88fa 100644 --- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -38,7 +38,10 @@

#include "bat_algo.h" #include "hard-interface.h" +#include "hash.h" +#include "originator.h" #include "packet.h" +#include "routing.h" #include "send.h"

/** @@ -191,3 +194,152 @@ void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface) } rcu_read_unlock(); } + +/** + * batadv_v_ogm_orig_get - retrieve and possibly create an originator node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the address of the originator + * + * Return: the orig_node corresponding to the specified address. If such object + * does not exist it is allocated here. In case of allocation failure returns + * NULL. + */ +static struct batadv_orig_node * +batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, + const u8 *addr) +{ + struct batadv_orig_node *orig_node; + int hash_added; + + orig_node = batadv_orig_hash_find(bat_priv, addr); + if (orig_node) + return orig_node; + + orig_node = batadv_orig_node_new(bat_priv, addr); + if (!orig_node) + return NULL; + + hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, + batadv_choose_orig, orig_node, + &orig_node->hash_entry); + if (hash_added != 0) { + /* orig_node->refcounter is initialised to 2 by + * batadv_orig_node_new() + */ + batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); + orig_node = NULL; + } + + return orig_node; +} + +/** + * batadv_v_elp_neigh_update - update an ELP neighbour node + * @bat_priv: the bat priv with all the soft interface information + * @neigh_addr: the neighbour interface address + * @if_incoming: the interface the packet was received through + * @elp_packet: the received ELP packet + * + * Updates the ELP neighbour node state with the data received within the new + * ELP packet. + */ +static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv, + u8 *neigh_addr, + struct batadv_hard_iface *if_incoming, + struct batadv_elp_packet *elp_packet) + +{ + struct batadv_neigh_node *neigh; + struct batadv_orig_node *orig_neigh; + struct batadv_hardif_neigh_node *hardif_neigh; + s32 seqno_diff; + s32 elp_latest_seqno; + + orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig); + if (!orig_neigh) + return; + + neigh = batadv_neigh_node_new(orig_neigh, if_incoming, neigh_addr); + if (!neigh) + goto orig_free; + + hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr); + if (!hardif_neigh) + goto neigh_free; + + elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno; + seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno; + + /* known or older sequence numbers are ignored. However always adopt + * if the router seems to have been restarted. + */ + if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE) + goto hardif_free; + + neigh->last_seen = jiffies; + hardif_neigh->last_seen = jiffies; + hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno); + hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval); + +hardif_free: + if (hardif_neigh) + batadv_hardif_neigh_put(hardif_neigh); +neigh_free: + if (neigh) + batadv_neigh_node_put(neigh); +orig_free: + if (orig_neigh) + batadv_orig_node_put(orig_neigh); +} + +/** + * batadv_v_elp_packet_recv - main ELP packet handler + * @skb: the received packet + * @if_incoming: the interface this packet was received through + * + * Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly + * processed or NET_RX_DROP in case of failure. + */ +int batadv_v_elp_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_elp_packet *elp_packet; + struct batadv_hard_iface *primary_if; + struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); + bool ret; + + ret = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN); + if (!ret) + return NET_RX_DROP; + + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) + return NET_RX_DROP; + + /* did we receive a B.A.T.M.A.N. V ELP packet on an interface + * that does not have B.A.T.M.A.N. V ELP enabled ? + */ + if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0) + return NET_RX_DROP; + + elp_packet = (struct batadv_elp_packet *)skb->data; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Received ELP packet from %pM seqno %u ORIG: %pM\n", + ethhdr->h_source, ntohl(elp_packet->seqno), + elp_packet->orig); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming, + elp_packet); + +out: + if (primary_if) + batadv_hardif_put(primary_if); + consume_skb(skb); + return NET_RX_SUCCESS; +} diff --git a/net/batman-adv/bat_v_elp.h b/net/batman-adv/bat_v_elp.h index 7a584d1..5a7bc39 100644 --- a/net/batman-adv/bat_v_elp.h +++ b/net/batman-adv/bat_v_elp.h @@ -20,8 +20,12 @@ #ifndef _NET_BATMAN_ADV_BAT_V_ELP_H_ #define _NET_BATMAN_ADV_BAT_V_ELP_H_

+struct sk_buff; + int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface); void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface); void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface); +int batadv_v_elp_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming);

#endif /* _NET_BATMAN_ADV_BAT_V_ELP_H_ */ diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h index 8c01f54..d91bae2 100644 --- a/net/batman-adv/main.h +++ b/net/batman-adv/main.h @@ -60,6 +60,9 @@ #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1 #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1

+/* B.A.T.M.A.N. V */ +#define BATADV_ELP_MAX_AGE 64 + /* number of OGMs sent with the last tt diff */ #define BATADV_TT_OGM_APPEND_MAX 3

diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 992d5fd..7fc82a5 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -22,6 +22,7 @@ #error only "main.h" can be included directly #endif

+#include <linux/average.h> #include <linux/bitops.h> #include <linux/compiler.h> #include <linux/if_ether.h> @@ -364,12 +365,28 @@ struct batadv_gw_node { struct rcu_head rcu; };

+DECLARE_EWMA(throughput, 1024, 8) + +/** + * struct batadv_hardif_neigh_node_bat_v - B.A.T.M.A.N. V private neighbor + * information + * @throughput: ewma link throughput towards this neighbor + * @elp_interval: time interval between two ELP transmissions + * @elp_latest_seqno: latest and best known ELP sequence number + */ +struct batadv_hardif_neigh_node_bat_v { + struct ewma_throughput throughput; + u32 elp_interval; + u32 elp_latest_seqno; +}; + /** * struct batadv_hardif_neigh_node - unique neighbor per hard-interface * @list: list node for batadv_hard_iface::neigh_list * @addr: the MAC address of the neighboring interface * @if_incoming: pointer to incoming hard-interface * @last_seen: when last packet via this neighbor was received + * @bat_v: B.A.T.M.A.N. V private data * @refcount: number of contexts the object is used * @rcu: struct used for freeing in a RCU-safe manner */ @@ -378,6 +395,9 @@ struct batadv_hardif_neigh_node { u8 addr[ETH_ALEN]; struct batadv_hard_iface *if_incoming; unsigned long last_seen; +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_hardif_neigh_node_bat_v bat_v; +#endif struct kref refcount; struct rcu_head rcu; }; @@ -425,10 +445,20 @@ struct batadv_neigh_ifinfo_bat_iv { };

/** + * struct batadv_neigh_ifinfo_bat_v - neighbor information per outgoing + * interface for B.A.T.M.A.N. V + * @throughput: last throughput metric received from originator via this neigh + */ +struct batadv_neigh_ifinfo_bat_v { + u32 throughput; +}; + +/** * struct batadv_neigh_ifinfo - neighbor information per outgoing interface * @list: list node for batadv_neigh_node::ifinfo_list * @if_outgoing: pointer to outgoing hard-interface * @bat_iv: B.A.T.M.A.N. IV private structure + * @bat_v: B.A.T.M.A.N. V private data * @last_ttl: last received ttl from this neigh node * @refcount: number of contexts the object is used * @rcu: struct used for freeing in a RCU-safe manner @@ -437,6 +467,9 @@ struct batadv_neigh_ifinfo { struct hlist_node list; struct batadv_hard_iface *if_outgoing; struct batadv_neigh_ifinfo_bat_iv bat_iv; +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_neigh_ifinfo_bat_v bat_v; +#endif u8 last_ttl; struct kref refcount; struct rcu_head rcu;