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1085 lines
33 KiB
1085 lines
33 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (C) B.A.T.M.A.N. contributors: |
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* |
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* Antonio Quartulli |
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*/ |
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|
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#include "bat_v_ogm.h" |
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#include "main.h" |
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|
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#include <linux/atomic.h> |
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#include <linux/byteorder/generic.h> |
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#include <linux/errno.h> |
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#include <linux/etherdevice.h> |
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#include <linux/gfp.h> |
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#include <linux/if_ether.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/lockdep.h> |
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#include <linux/minmax.h> |
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#include <linux/mutex.h> |
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#include <linux/netdevice.h> |
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#include <linux/prandom.h> |
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#include <linux/random.h> |
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#include <linux/rculist.h> |
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#include <linux/rcupdate.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/stddef.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/workqueue.h> |
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#include <uapi/linux/batadv_packet.h> |
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#include "bat_algo.h" |
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#include "hard-interface.h" |
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#include "hash.h" |
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#include "log.h" |
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#include "originator.h" |
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#include "routing.h" |
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#include "send.h" |
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#include "translation-table.h" |
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#include "tvlv.h" |
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|
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/** |
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* batadv_v_ogm_orig_get() - retrieve and possibly create an originator node |
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* @bat_priv: the bat priv with all the soft interface information |
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* @addr: the address of the originator |
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* |
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* Return: the orig_node corresponding to the specified address. If such an |
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* object does not exist, it is allocated here. In case of allocation failure |
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* returns NULL. |
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*/ |
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struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, |
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const u8 *addr) |
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{ |
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struct batadv_orig_node *orig_node; |
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int hash_added; |
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orig_node = batadv_orig_hash_find(bat_priv, addr); |
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if (orig_node) |
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return orig_node; |
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orig_node = batadv_orig_node_new(bat_priv, addr); |
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if (!orig_node) |
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return NULL; |
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kref_get(&orig_node->refcount); |
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hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
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batadv_choose_orig, orig_node, |
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&orig_node->hash_entry); |
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if (hash_added != 0) { |
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/* remove refcnt for newly created orig_node and hash entry */ |
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batadv_orig_node_put(orig_node); |
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batadv_orig_node_put(orig_node); |
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orig_node = NULL; |
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} |
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return orig_node; |
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} |
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/** |
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* batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer |
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* @hard_iface: the interface to use to send the OGM |
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*/ |
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static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface) |
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{ |
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unsigned int msecs = BATADV_MAX_AGGREGATION_MS * 1000; |
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/* msecs * [0.9, 1.1] */ |
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msecs += prandom_u32_max(msecs / 5) - (msecs / 10); |
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queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.aggr_wq, |
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msecs_to_jiffies(msecs / 1000)); |
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} |
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/** |
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* batadv_v_ogm_start_timer() - restart the OGM sending timer |
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* @bat_priv: the bat priv with all the soft interface information |
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*/ |
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static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) |
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{ |
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unsigned long msecs; |
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/* this function may be invoked in different contexts (ogm rescheduling |
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* or hard_iface activation), but the work timer should not be reset |
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*/ |
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if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) |
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return; |
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msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; |
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msecs += prandom_u32_max(2 * BATADV_JITTER); |
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queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, |
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msecs_to_jiffies(msecs)); |
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} |
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/** |
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* batadv_v_ogm_send_to_if() - send a batman ogm using a given interface |
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* @skb: the OGM to send |
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* @hard_iface: the interface to use to send the OGM |
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*/ |
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static void batadv_v_ogm_send_to_if(struct sk_buff *skb, |
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struct batadv_hard_iface *hard_iface) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
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if (hard_iface->if_status != BATADV_IF_ACTIVE) |
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return; |
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batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
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batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, |
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skb->len + ETH_HLEN); |
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batadv_send_broadcast_skb(skb, hard_iface); |
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} |
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/** |
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* batadv_v_ogm_len() - OGMv2 packet length |
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* @skb: the OGM to check |
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* |
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* Return: Length of the given OGMv2 packet, including tvlv length, excluding |
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* ethernet header length. |
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*/ |
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static unsigned int batadv_v_ogm_len(struct sk_buff *skb) |
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{ |
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struct batadv_ogm2_packet *ogm_packet; |
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ogm_packet = (struct batadv_ogm2_packet *)skb->data; |
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return BATADV_OGM2_HLEN + ntohs(ogm_packet->tvlv_len); |
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} |
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/** |
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* batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue |
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* @skb: the OGM to check |
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* @hard_iface: the interface to use to send the OGM |
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* |
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* Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
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* |
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* Return: True, if the given OGMv2 packet still fits, false otherwise. |
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*/ |
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static bool batadv_v_ogm_queue_left(struct sk_buff *skb, |
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struct batadv_hard_iface *hard_iface) |
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{ |
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unsigned int max = min_t(unsigned int, hard_iface->net_dev->mtu, |
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BATADV_MAX_AGGREGATION_BYTES); |
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unsigned int ogm_len = batadv_v_ogm_len(skb); |
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lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
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return hard_iface->bat_v.aggr_len + ogm_len <= max; |
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} |
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/** |
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* batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue |
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* @hard_iface: the interface holding the aggregation queue |
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* |
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* Empties the OGMv2 aggregation queue and frees all the skbs it contains. |
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* |
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* Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
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*/ |
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static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) |
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{ |
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lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
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__skb_queue_purge(&hard_iface->bat_v.aggr_list); |
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hard_iface->bat_v.aggr_len = 0; |
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} |
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/** |
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* batadv_v_ogm_aggr_send() - flush & send aggregation queue |
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* @hard_iface: the interface with the aggregation queue to flush |
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* |
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* Aggregates all OGMv2 packets currently in the aggregation queue into a |
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* single OGMv2 packet and transmits this aggregate. |
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* |
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* The aggregation queue is empty after this call. |
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* |
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* Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
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*/ |
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static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) |
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{ |
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unsigned int aggr_len = hard_iface->bat_v.aggr_len; |
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struct sk_buff *skb_aggr; |
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unsigned int ogm_len; |
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struct sk_buff *skb; |
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lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
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if (!aggr_len) |
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return; |
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skb_aggr = dev_alloc_skb(aggr_len + ETH_HLEN + NET_IP_ALIGN); |
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if (!skb_aggr) { |
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batadv_v_ogm_aggr_list_free(hard_iface); |
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return; |
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} |
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skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN); |
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skb_reset_network_header(skb_aggr); |
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while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) { |
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hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb); |
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ogm_len = batadv_v_ogm_len(skb); |
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skb_put_data(skb_aggr, skb->data, ogm_len); |
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consume_skb(skb); |
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} |
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batadv_v_ogm_send_to_if(skb_aggr, hard_iface); |
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} |
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/** |
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* batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface |
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* @skb: the OGM to queue |
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* @hard_iface: the interface to queue the OGM on |
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*/ |
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static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, |
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struct batadv_hard_iface *hard_iface) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
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if (!atomic_read(&bat_priv->aggregated_ogms)) { |
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batadv_v_ogm_send_to_if(skb, hard_iface); |
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return; |
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} |
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spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
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if (!batadv_v_ogm_queue_left(skb, hard_iface)) |
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batadv_v_ogm_aggr_send(hard_iface); |
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hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); |
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__skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); |
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spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
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} |
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/** |
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* batadv_v_ogm_send_softif() - periodic worker broadcasting the own OGM |
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* @bat_priv: the bat priv with all the soft interface information |
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*/ |
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static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) |
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{ |
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struct batadv_hard_iface *hard_iface; |
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struct batadv_ogm2_packet *ogm_packet; |
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struct sk_buff *skb, *skb_tmp; |
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unsigned char *ogm_buff; |
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int ogm_buff_len; |
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u16 tvlv_len = 0; |
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int ret; |
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lockdep_assert_held(&bat_priv->bat_v.ogm_buff_mutex); |
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if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
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goto out; |
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ogm_buff = bat_priv->bat_v.ogm_buff; |
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ogm_buff_len = bat_priv->bat_v.ogm_buff_len; |
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/* tt changes have to be committed before the tvlv data is |
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* appended as it may alter the tt tvlv container |
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*/ |
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batadv_tt_local_commit_changes(bat_priv); |
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tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, |
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&ogm_buff_len, |
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BATADV_OGM2_HLEN); |
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bat_priv->bat_v.ogm_buff = ogm_buff; |
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bat_priv->bat_v.ogm_buff_len = ogm_buff_len; |
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skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); |
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if (!skb) |
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goto reschedule; |
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skb_reserve(skb, ETH_HLEN); |
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skb_put_data(skb, ogm_buff, ogm_buff_len); |
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ogm_packet = (struct batadv_ogm2_packet *)skb->data; |
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ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); |
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atomic_inc(&bat_priv->bat_v.ogm_seqno); |
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ogm_packet->tvlv_len = htons(tvlv_len); |
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/* broadcast on every interface */ |
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rcu_read_lock(); |
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
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if (hard_iface->soft_iface != bat_priv->soft_iface) |
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continue; |
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if (!kref_get_unless_zero(&hard_iface->refcount)) |
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continue; |
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ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); |
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if (ret) { |
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char *type; |
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switch (ret) { |
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case BATADV_HARDIF_BCAST_NORECIPIENT: |
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type = "no neighbor"; |
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break; |
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case BATADV_HARDIF_BCAST_DUPFWD: |
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type = "single neighbor is source"; |
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break; |
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case BATADV_HARDIF_BCAST_DUPORIG: |
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type = "single neighbor is originator"; |
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break; |
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default: |
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type = "unknown"; |
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} |
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", |
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hard_iface->net_dev->name, type); |
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batadv_hardif_put(hard_iface); |
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continue; |
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} |
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
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"Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", |
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ogm_packet->orig, ntohl(ogm_packet->seqno), |
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ntohl(ogm_packet->throughput), ogm_packet->ttl, |
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hard_iface->net_dev->name, |
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hard_iface->net_dev->dev_addr); |
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/* this skb gets consumed by batadv_v_ogm_send_to_if() */ |
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skb_tmp = skb_clone(skb, GFP_ATOMIC); |
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if (!skb_tmp) { |
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batadv_hardif_put(hard_iface); |
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break; |
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} |
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batadv_v_ogm_queue_on_if(skb_tmp, hard_iface); |
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batadv_hardif_put(hard_iface); |
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} |
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rcu_read_unlock(); |
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consume_skb(skb); |
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reschedule: |
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batadv_v_ogm_start_timer(bat_priv); |
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out: |
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return; |
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} |
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/** |
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* batadv_v_ogm_send() - periodic worker broadcasting the own OGM |
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* @work: work queue item |
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*/ |
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static void batadv_v_ogm_send(struct work_struct *work) |
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{ |
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struct batadv_priv_bat_v *bat_v; |
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struct batadv_priv *bat_priv; |
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bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); |
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bat_priv = container_of(bat_v, struct batadv_priv, bat_v); |
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mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
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batadv_v_ogm_send_softif(bat_priv); |
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mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); |
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} |
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/** |
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* batadv_v_ogm_aggr_work() - OGM queue periodic task per interface |
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* @work: work queue item |
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* |
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* Emits aggregated OGM messages in regular intervals. |
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*/ |
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void batadv_v_ogm_aggr_work(struct work_struct *work) |
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{ |
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struct batadv_hard_iface_bat_v *batv; |
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struct batadv_hard_iface *hard_iface; |
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|
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batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work); |
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hard_iface = container_of(batv, struct batadv_hard_iface, bat_v); |
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spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
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batadv_v_ogm_aggr_send(hard_iface); |
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spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
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batadv_v_ogm_start_queue_timer(hard_iface); |
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} |
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/** |
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* batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V |
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* @hard_iface: the interface to prepare |
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* |
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* Takes care of scheduling its own OGM sending routine for this interface. |
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* |
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* Return: 0 on success or a negative error code otherwise |
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*/ |
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int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
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batadv_v_ogm_start_queue_timer(hard_iface); |
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batadv_v_ogm_start_timer(bat_priv); |
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|
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return 0; |
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} |
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|
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/** |
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* batadv_v_ogm_iface_disable() - release OGM interface private resources |
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* @hard_iface: interface for which the resources have to be released |
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*/ |
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void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
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{ |
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cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq); |
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|
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spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
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batadv_v_ogm_aggr_list_free(hard_iface); |
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spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
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} |
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|
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/** |
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* batadv_v_ogm_primary_iface_set() - set a new primary interface |
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* @primary_iface: the new primary interface |
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*/ |
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void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); |
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struct batadv_ogm2_packet *ogm_packet; |
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|
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mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
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if (!bat_priv->bat_v.ogm_buff) |
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goto unlock; |
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ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; |
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ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); |
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|
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unlock: |
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mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); |
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} |
|
|
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/** |
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* batadv_v_forward_penalty() - apply a penalty to the throughput metric |
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* forwarded with B.A.T.M.A.N. V OGMs |
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* @bat_priv: the bat priv with all the soft interface information |
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* @if_incoming: the interface where the OGM has been received |
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* @if_outgoing: the interface where the OGM has to be forwarded to |
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* @throughput: the current throughput |
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* |
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* Apply a penalty on the current throughput metric value based on the |
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* characteristic of the interface where the OGM has been received. |
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* |
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* Initially the per hardif hop penalty is applied to the throughput. After |
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* that the return value is then computed as follows: |
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* - throughput * 50% if the incoming and outgoing interface are the |
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* same WiFi interface and the throughput is above |
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* 1MBit/s |
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* - throughput if the outgoing interface is the default |
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* interface (i.e. this OGM is processed for the |
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* internal table and not forwarded) |
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* - throughput * node hop penalty otherwise |
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* |
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* Return: the penalised throughput metric. |
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*/ |
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static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, |
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struct batadv_hard_iface *if_incoming, |
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struct batadv_hard_iface *if_outgoing, |
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u32 throughput) |
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{ |
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int if_hop_penalty = atomic_read(&if_incoming->hop_penalty); |
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int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
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int hop_penalty_max = BATADV_TQ_MAX_VALUE; |
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|
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/* Apply per hardif hop penalty */ |
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throughput = throughput * (hop_penalty_max - if_hop_penalty) / |
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hop_penalty_max; |
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|
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/* Don't apply hop penalty in default originator table. */ |
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if (if_outgoing == BATADV_IF_DEFAULT) |
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return throughput; |
|
|
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/* Forwarding on the same WiFi interface cuts the throughput in half |
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* due to the store & forward characteristics of WIFI. |
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* Very low throughput values are the exception. |
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*/ |
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if (throughput > 10 && |
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if_incoming == if_outgoing && |
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!(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
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return throughput / 2; |
|
|
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/* hop penalty of 255 equals 100% */ |
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return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; |
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} |
|
|
|
/** |
|
* batadv_v_ogm_forward() - check conditions and forward an OGM to the given |
|
* outgoing interface |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @ogm_received: previously received OGM to be forwarded |
|
* @orig_node: the originator which has been updated |
|
* @neigh_node: the neigh_node through with the OGM has been received |
|
* @if_incoming: the interface on which this OGM was received on |
|
* @if_outgoing: the interface to which the OGM has to be forwarded to |
|
* |
|
* Forward an OGM to an interface after having altered the throughput metric and |
|
* the TTL value contained in it. The original OGM isn't modified. |
|
*/ |
|
static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, |
|
const struct batadv_ogm2_packet *ogm_received, |
|
struct batadv_orig_node *orig_node, |
|
struct batadv_neigh_node *neigh_node, |
|
struct batadv_hard_iface *if_incoming, |
|
struct batadv_hard_iface *if_outgoing) |
|
{ |
|
struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
|
struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
|
struct batadv_neigh_node *router = NULL; |
|
struct batadv_ogm2_packet *ogm_forward; |
|
unsigned char *skb_buff; |
|
struct sk_buff *skb; |
|
size_t packet_len; |
|
u16 tvlv_len; |
|
|
|
/* only forward for specific interfaces, not for the default one. */ |
|
if (if_outgoing == BATADV_IF_DEFAULT) |
|
goto out; |
|
|
|
orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
|
if (!orig_ifinfo) |
|
goto out; |
|
|
|
/* acquire possibly updated router */ |
|
router = batadv_orig_router_get(orig_node, if_outgoing); |
|
|
|
/* strict rule: forward packets coming from the best next hop only */ |
|
if (neigh_node != router) |
|
goto out; |
|
|
|
/* don't forward the same seqno twice on one interface */ |
|
if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) |
|
goto out; |
|
|
|
orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); |
|
|
|
if (ogm_received->ttl <= 1) { |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
|
goto out; |
|
} |
|
|
|
neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
|
if (!neigh_ifinfo) |
|
goto out; |
|
|
|
tvlv_len = ntohs(ogm_received->tvlv_len); |
|
|
|
packet_len = BATADV_OGM2_HLEN + tvlv_len; |
|
skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, |
|
ETH_HLEN + packet_len); |
|
if (!skb) |
|
goto out; |
|
|
|
skb_reserve(skb, ETH_HLEN); |
|
skb_buff = skb_put_data(skb, ogm_received, packet_len); |
|
|
|
/* apply forward penalty */ |
|
ogm_forward = (struct batadv_ogm2_packet *)skb_buff; |
|
ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
|
ogm_forward->ttl--; |
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", |
|
if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
|
ogm_forward->ttl, if_incoming->net_dev->name); |
|
|
|
batadv_v_ogm_queue_on_if(skb, if_outgoing); |
|
|
|
out: |
|
batadv_orig_ifinfo_put(orig_ifinfo); |
|
batadv_neigh_node_put(router); |
|
batadv_neigh_ifinfo_put(neigh_ifinfo); |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_metric_update() - update route metric based on OGM |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @ogm2: OGM2 structure |
|
* @orig_node: Originator structure for which the OGM has been received |
|
* @neigh_node: the neigh_node through with the OGM has been received |
|
* @if_incoming: the interface where this packet was received |
|
* @if_outgoing: the interface for which the packet should be considered |
|
* |
|
* Return: |
|
* 1 if the OGM is new, |
|
* 0 if it is not new but valid, |
|
* <0 on error (e.g. old OGM) |
|
*/ |
|
static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, |
|
const struct batadv_ogm2_packet *ogm2, |
|
struct batadv_orig_node *orig_node, |
|
struct batadv_neigh_node *neigh_node, |
|
struct batadv_hard_iface *if_incoming, |
|
struct batadv_hard_iface *if_outgoing) |
|
{ |
|
struct batadv_orig_ifinfo *orig_ifinfo; |
|
struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
|
bool protection_started = false; |
|
int ret = -EINVAL; |
|
u32 path_throughput; |
|
s32 seq_diff; |
|
|
|
orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
|
if (!orig_ifinfo) |
|
goto out; |
|
|
|
seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; |
|
|
|
if (!hlist_empty(&orig_node->neigh_list) && |
|
batadv_window_protected(bat_priv, seq_diff, |
|
BATADV_OGM_MAX_AGE, |
|
&orig_ifinfo->batman_seqno_reset, |
|
&protection_started)) { |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Drop packet: packet within window protection time from %pM\n", |
|
ogm2->orig); |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Last reset: %ld, %ld\n", |
|
orig_ifinfo->batman_seqno_reset, jiffies); |
|
goto out; |
|
} |
|
|
|
/* drop packets with old seqnos, however accept the first packet after |
|
* a host has been rebooted. |
|
*/ |
|
if (seq_diff < 0 && !protection_started) |
|
goto out; |
|
|
|
neigh_node->last_seen = jiffies; |
|
|
|
orig_node->last_seen = jiffies; |
|
|
|
orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); |
|
orig_ifinfo->last_ttl = ogm2->ttl; |
|
|
|
neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
|
if (!neigh_ifinfo) |
|
goto out; |
|
|
|
path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, |
|
if_outgoing, |
|
ntohl(ogm2->throughput)); |
|
neigh_ifinfo->bat_v.throughput = path_throughput; |
|
neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); |
|
neigh_ifinfo->last_ttl = ogm2->ttl; |
|
|
|
if (seq_diff > 0 || protection_started) |
|
ret = 1; |
|
else |
|
ret = 0; |
|
out: |
|
batadv_orig_ifinfo_put(orig_ifinfo); |
|
batadv_neigh_ifinfo_put(neigh_ifinfo); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_route_update() - update routes based on OGM |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @ethhdr: the Ethernet header of the OGM2 |
|
* @ogm2: OGM2 structure |
|
* @orig_node: Originator structure for which the OGM has been received |
|
* @neigh_node: the neigh_node through with the OGM has been received |
|
* @if_incoming: the interface where this packet was received |
|
* @if_outgoing: the interface for which the packet should be considered |
|
* |
|
* Return: true if the packet should be forwarded, false otherwise |
|
*/ |
|
static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
|
const struct ethhdr *ethhdr, |
|
const struct batadv_ogm2_packet *ogm2, |
|
struct batadv_orig_node *orig_node, |
|
struct batadv_neigh_node *neigh_node, |
|
struct batadv_hard_iface *if_incoming, |
|
struct batadv_hard_iface *if_outgoing) |
|
{ |
|
struct batadv_neigh_node *router = NULL; |
|
struct batadv_orig_node *orig_neigh_node; |
|
struct batadv_neigh_node *orig_neigh_router = NULL; |
|
struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
|
u32 router_throughput, neigh_throughput; |
|
u32 router_last_seqno; |
|
u32 neigh_last_seqno; |
|
s32 neigh_seq_diff; |
|
bool forward = false; |
|
|
|
orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); |
|
if (!orig_neigh_node) |
|
goto out; |
|
|
|
orig_neigh_router = batadv_orig_router_get(orig_neigh_node, |
|
if_outgoing); |
|
|
|
/* drop packet if sender is not a direct neighbor and if we |
|
* don't route towards it |
|
*/ |
|
router = batadv_orig_router_get(orig_node, if_outgoing); |
|
if (router && router->orig_node != orig_node && !orig_neigh_router) { |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Drop packet: OGM via unknown neighbor!\n"); |
|
goto out; |
|
} |
|
|
|
/* Mark the OGM to be considered for forwarding, and update routes |
|
* if needed. |
|
*/ |
|
forward = true; |
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Searching and updating originator entry of received packet\n"); |
|
|
|
/* if this neighbor already is our next hop there is nothing |
|
* to change |
|
*/ |
|
if (router == neigh_node) |
|
goto out; |
|
|
|
/* don't consider neighbours with worse throughput. |
|
* also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than |
|
* the last received seqno from our best next hop. |
|
*/ |
|
if (router) { |
|
router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); |
|
neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
|
|
|
/* if these are not allocated, something is wrong. */ |
|
if (!router_ifinfo || !neigh_ifinfo) |
|
goto out; |
|
|
|
neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; |
|
router_last_seqno = router_ifinfo->bat_v.last_seqno; |
|
neigh_seq_diff = neigh_last_seqno - router_last_seqno; |
|
router_throughput = router_ifinfo->bat_v.throughput; |
|
neigh_throughput = neigh_ifinfo->bat_v.throughput; |
|
|
|
if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF && |
|
router_throughput >= neigh_throughput) |
|
goto out; |
|
} |
|
|
|
batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); |
|
out: |
|
batadv_neigh_node_put(router); |
|
batadv_neigh_node_put(orig_neigh_router); |
|
batadv_orig_node_put(orig_neigh_node); |
|
batadv_neigh_ifinfo_put(router_ifinfo); |
|
batadv_neigh_ifinfo_put(neigh_ifinfo); |
|
|
|
return forward; |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @ethhdr: the Ethernet header of the OGM2 |
|
* @ogm2: OGM2 structure |
|
* @orig_node: Originator structure for which the OGM has been received |
|
* @neigh_node: the neigh_node through with the OGM has been received |
|
* @if_incoming: the interface where this packet was received |
|
* @if_outgoing: the interface for which the packet should be considered |
|
*/ |
|
static void |
|
batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, |
|
const struct ethhdr *ethhdr, |
|
const struct batadv_ogm2_packet *ogm2, |
|
struct batadv_orig_node *orig_node, |
|
struct batadv_neigh_node *neigh_node, |
|
struct batadv_hard_iface *if_incoming, |
|
struct batadv_hard_iface *if_outgoing) |
|
{ |
|
int seqno_age; |
|
bool forward; |
|
|
|
/* first, update the metric with according sanity checks */ |
|
seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, |
|
neigh_node, if_incoming, |
|
if_outgoing); |
|
|
|
/* outdated sequence numbers are to be discarded */ |
|
if (seqno_age < 0) |
|
return; |
|
|
|
/* only unknown & newer OGMs contain TVLVs we are interested in */ |
|
if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT) |
|
batadv_tvlv_containers_process(bat_priv, true, orig_node, |
|
NULL, NULL, |
|
(unsigned char *)(ogm2 + 1), |
|
ntohs(ogm2->tvlv_len)); |
|
|
|
/* if the metric update went through, update routes if needed */ |
|
forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
|
neigh_node, if_incoming, |
|
if_outgoing); |
|
|
|
/* if the routes have been processed correctly, check and forward */ |
|
if (forward) |
|
batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, |
|
if_incoming, if_outgoing); |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated |
|
* @buff_pos: current position in the skb |
|
* @packet_len: total length of the skb |
|
* @ogm2_packet: potential OGM2 in buffer |
|
* |
|
* Return: true if there is enough space for another OGM, false otherwise. |
|
*/ |
|
static bool |
|
batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, |
|
const struct batadv_ogm2_packet *ogm2_packet) |
|
{ |
|
int next_buff_pos = 0; |
|
|
|
/* check if there is enough space for the header */ |
|
next_buff_pos += buff_pos + sizeof(*ogm2_packet); |
|
if (next_buff_pos > packet_len) |
|
return false; |
|
|
|
/* check if there is enough space for the optional TVLV */ |
|
next_buff_pos += ntohs(ogm2_packet->tvlv_len); |
|
|
|
return (next_buff_pos <= packet_len) && |
|
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_process() - process an incoming batman v OGM |
|
* @skb: the skb containing the OGM |
|
* @ogm_offset: offset to the OGM which should be processed (for aggregates) |
|
* @if_incoming: the interface where this packet was received |
|
*/ |
|
static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, |
|
struct batadv_hard_iface *if_incoming) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
|
struct ethhdr *ethhdr; |
|
struct batadv_orig_node *orig_node = NULL; |
|
struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
|
struct batadv_neigh_node *neigh_node = NULL; |
|
struct batadv_hard_iface *hard_iface; |
|
struct batadv_ogm2_packet *ogm_packet; |
|
u32 ogm_throughput, link_throughput, path_throughput; |
|
int ret; |
|
|
|
ethhdr = eth_hdr(skb); |
|
ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); |
|
|
|
ogm_throughput = ntohl(ogm_packet->throughput); |
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, throughput %u, TTL %u, V %u, tvlv_len %u)\n", |
|
ethhdr->h_source, if_incoming->net_dev->name, |
|
if_incoming->net_dev->dev_addr, ogm_packet->orig, |
|
ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, |
|
ogm_packet->version, ntohs(ogm_packet->tvlv_len)); |
|
|
|
if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) { |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Drop packet: originator packet from ourself\n"); |
|
return; |
|
} |
|
|
|
/* If the throughput metric is 0, immediately drop the packet. No need |
|
* to create orig_node / neigh_node for an unusable route. |
|
*/ |
|
if (ogm_throughput == 0) { |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Drop packet: originator packet with throughput metric of 0\n"); |
|
return; |
|
} |
|
|
|
/* require ELP packets be to received from this neighbor first */ |
|
hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); |
|
if (!hardif_neigh) { |
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
|
"Drop packet: OGM via unknown neighbor!\n"); |
|
goto out; |
|
} |
|
|
|
orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); |
|
if (!orig_node) |
|
goto out; |
|
|
|
neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
|
ethhdr->h_source); |
|
if (!neigh_node) |
|
goto out; |
|
|
|
/* Update the received throughput metric to match the link |
|
* characteristic: |
|
* - If this OGM traveled one hop so far (emitted by single hop |
|
* neighbor) the path throughput metric equals the link throughput. |
|
* - For OGMs traversing more than hop the path throughput metric is |
|
* the smaller of the path throughput and the link throughput. |
|
*/ |
|
link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); |
|
path_throughput = min_t(u32, link_throughput, ogm_throughput); |
|
ogm_packet->throughput = htonl(path_throughput); |
|
|
|
batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, |
|
neigh_node, if_incoming, |
|
BATADV_IF_DEFAULT); |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
|
if (hard_iface->if_status != BATADV_IF_ACTIVE) |
|
continue; |
|
|
|
if (hard_iface->soft_iface != bat_priv->soft_iface) |
|
continue; |
|
|
|
if (!kref_get_unless_zero(&hard_iface->refcount)) |
|
continue; |
|
|
|
ret = batadv_hardif_no_broadcast(hard_iface, |
|
ogm_packet->orig, |
|
hardif_neigh->orig); |
|
|
|
if (ret) { |
|
char *type; |
|
|
|
switch (ret) { |
|
case BATADV_HARDIF_BCAST_NORECIPIENT: |
|
type = "no neighbor"; |
|
break; |
|
case BATADV_HARDIF_BCAST_DUPFWD: |
|
type = "single neighbor is source"; |
|
break; |
|
case BATADV_HARDIF_BCAST_DUPORIG: |
|
type = "single neighbor is originator"; |
|
break; |
|
default: |
|
type = "unknown"; |
|
} |
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", |
|
ogm_packet->orig, hard_iface->net_dev->name, |
|
type); |
|
|
|
batadv_hardif_put(hard_iface); |
|
continue; |
|
} |
|
|
|
batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
|
orig_node, neigh_node, |
|
if_incoming, hard_iface); |
|
|
|
batadv_hardif_put(hard_iface); |
|
} |
|
rcu_read_unlock(); |
|
out: |
|
batadv_orig_node_put(orig_node); |
|
batadv_neigh_node_put(neigh_node); |
|
batadv_hardif_neigh_put(hardif_neigh); |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_packet_recv() - OGM2 receiving handler |
|
* @skb: the received OGM |
|
* @if_incoming: the interface where this OGM has been received |
|
* |
|
* Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP |
|
* (without freeing the skb) on failure |
|
*/ |
|
int batadv_v_ogm_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_ogm2_packet *ogm_packet; |
|
struct ethhdr *ethhdr = eth_hdr(skb); |
|
int ogm_offset; |
|
u8 *packet_pos; |
|
int ret = NET_RX_DROP; |
|
|
|
/* did we receive a OGM2 packet on an interface that does not have |
|
* B.A.T.M.A.N. V enabled ? |
|
*/ |
|
if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
|
goto free_skb; |
|
|
|
if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) |
|
goto free_skb; |
|
|
|
if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
|
goto free_skb; |
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
|
batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, |
|
skb->len + ETH_HLEN); |
|
|
|
ogm_offset = 0; |
|
ogm_packet = (struct batadv_ogm2_packet *)skb->data; |
|
|
|
while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), |
|
ogm_packet)) { |
|
batadv_v_ogm_process(skb, ogm_offset, if_incoming); |
|
|
|
ogm_offset += BATADV_OGM2_HLEN; |
|
ogm_offset += ntohs(ogm_packet->tvlv_len); |
|
|
|
packet_pos = skb->data + ogm_offset; |
|
ogm_packet = (struct batadv_ogm2_packet *)packet_pos; |
|
} |
|
|
|
ret = NET_RX_SUCCESS; |
|
|
|
free_skb: |
|
if (ret == NET_RX_SUCCESS) |
|
consume_skb(skb); |
|
else |
|
kfree_skb(skb); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_init() - initialise the OGM2 engine |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* |
|
* Return: 0 on success or a negative error code in case of failure |
|
*/ |
|
int batadv_v_ogm_init(struct batadv_priv *bat_priv) |
|
{ |
|
struct batadv_ogm2_packet *ogm_packet; |
|
unsigned char *ogm_buff; |
|
u32 random_seqno; |
|
|
|
bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; |
|
ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); |
|
if (!ogm_buff) |
|
return -ENOMEM; |
|
|
|
bat_priv->bat_v.ogm_buff = ogm_buff; |
|
ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; |
|
ogm_packet->packet_type = BATADV_OGM2; |
|
ogm_packet->version = BATADV_COMPAT_VERSION; |
|
ogm_packet->ttl = BATADV_TTL; |
|
ogm_packet->flags = BATADV_NO_FLAGS; |
|
ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); |
|
|
|
/* randomize initial seqno to avoid collision */ |
|
get_random_bytes(&random_seqno, sizeof(random_seqno)); |
|
atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); |
|
INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); |
|
|
|
mutex_init(&bat_priv->bat_v.ogm_buff_mutex); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* batadv_v_ogm_free() - free OGM private resources |
|
* @bat_priv: the bat priv with all the soft interface information |
|
*/ |
|
void batadv_v_ogm_free(struct batadv_priv *bat_priv) |
|
{ |
|
cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); |
|
|
|
mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
|
|
|
kfree(bat_priv->bat_v.ogm_buff); |
|
bat_priv->bat_v.ogm_buff = NULL; |
|
bat_priv->bat_v.ogm_buff_len = 0; |
|
|
|
mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); |
|
}
|
|
|