// SPDX-License-Identifier: GPL-2.0 /* Copyright (C) B.A.T.M.A.N. contributors: * * Antonio Quartulli */ #include "bat_v_ogm.h" #include "main.h" #include <linux/atomic.h> #include <linux/byteorder/generic.h> #include <linux/container_of.h> #include <linux/errno.h> #include <linux/etherdevice.h> #include <linux/gfp.h> #include <linux/if_ether.h> #include <linux/jiffies.h> #include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/minmax.h> #include <linux/mutex.h> #include <linux/netdevice.h> #include <linux/random.h> #include <linux/rculist.h> #include <linux/rcupdate.h> #include <linux/skbuff.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/stddef.h> #include <linux/string.h> #include <linux/types.h> #include <linux/workqueue.h> #include <uapi/linux/batadv_packet.h> #include "bat_algo.h" #include "hard-interface.h" #include "hash.h" #include "log.h" #include "originator.h" #include "routing.h" #include "send.h" #include "translation-table.h" #include "tvlv.h" /** * 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 an * object does not exist, it is allocated here. In case of allocation failure * returns NULL. */ struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) { … } /** * batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer * @hard_iface: the interface to use to send the OGM */ static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_start_timer() - restart the OGM sending timer * @bat_priv: the bat priv with all the soft interface information */ static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) { … } /** * batadv_v_ogm_send_to_if() - send a batman ogm using a given interface * @skb: the OGM to send * @hard_iface: the interface to use to send the OGM */ static void batadv_v_ogm_send_to_if(struct sk_buff *skb, struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_len() - OGMv2 packet length * @skb: the OGM to check * * Return: Length of the given OGMv2 packet, including tvlv length, excluding * ethernet header length. */ static unsigned int batadv_v_ogm_len(struct sk_buff *skb) { … } /** * batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue * @skb: the OGM to check * @hard_iface: the interface to use to send the OGM * * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. * * Return: True, if the given OGMv2 packet still fits, false otherwise. */ static bool batadv_v_ogm_queue_left(struct sk_buff *skb, struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue * @hard_iface: the interface holding the aggregation queue * * Empties the OGMv2 aggregation queue and frees all the skbs it contains. * * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. */ static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_aggr_send() - flush & send aggregation queue * @hard_iface: the interface with the aggregation queue to flush * * Aggregates all OGMv2 packets currently in the aggregation queue into a * single OGMv2 packet and transmits this aggregate. * * The aggregation queue is empty after this call. * * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. */ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface * @skb: the OGM to queue * @hard_iface: the interface to queue the OGM on */ static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_send_softif() - periodic worker broadcasting the own OGM * @bat_priv: the bat priv with all the soft interface information */ static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) { … } /** * batadv_v_ogm_send() - periodic worker broadcasting the own OGM * @work: work queue item */ static void batadv_v_ogm_send(struct work_struct *work) { … } /** * batadv_v_ogm_aggr_work() - OGM queue periodic task per interface * @work: work queue item * * Emits aggregated OGM messages in regular intervals. */ void batadv_v_ogm_aggr_work(struct work_struct *work) { … } /** * batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V * @hard_iface: the interface to prepare * * Takes care of scheduling its own OGM sending routine for this interface. * * Return: 0 on success or a negative error code otherwise */ int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_iface_disable() - release OGM interface private resources * @hard_iface: interface for which the resources have to be released */ void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) { … } /** * batadv_v_ogm_primary_iface_set() - set a new primary interface * @primary_iface: the new primary interface */ void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) { … } /** * batadv_v_forward_penalty() - apply a penalty to the throughput metric * forwarded with B.A.T.M.A.N. V OGMs * @bat_priv: the bat priv with all the soft interface information * @if_incoming: the interface where the OGM has been received * @if_outgoing: the interface where the OGM has to be forwarded to * @throughput: the current throughput * * Apply a penalty on the current throughput metric value based on the * characteristic of the interface where the OGM has been received. * * Initially the per hardif hop penalty is applied to the throughput. After * that the return value is then computed as follows: * - throughput * 50% if the incoming and outgoing interface are the * same WiFi interface and the throughput is above * 1MBit/s * - throughput if the outgoing interface is the default * interface (i.e. this OGM is processed for the * internal table and not forwarded) * - throughput * node hop penalty otherwise * * Return: the penalised throughput metric. */ static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, struct batadv_hard_iface *if_incoming, struct batadv_hard_iface *if_outgoing, u32 throughput) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … }
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