Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*/
#include "routing.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/byteorder/generic.h>
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/jiffies.h>
#include <linux/kref.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <uapi/linux/batadv_packet.h>
#include "bitarray.h"
#include "bridge_loop_avoidance.h"
#include "distributed-arp-table.h"
#include "fragmentation.h"
#include "hard-interface.h"
#include "icmp_socket.h"
#include "log.h"
#include "network-coding.h"
#include "originator.h"
#include "send.h"
#include "soft-interface.h"
#include "tp_meter.h"
#include "translation-table.h"
#include "tvlv.h"
static int batadv_route_unicast_packet(struct sk_buff *skb,
<------><------><------><------> struct batadv_hard_iface *recv_if);
/**
* _batadv_update_route() - set the router for this originator
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node which is to be configured
* @recv_if: the receive interface for which this route is set
* @neigh_node: neighbor which should be the next router
*
* This function does not perform any error checks
*/
static void _batadv_update_route(struct batadv_priv *bat_priv,
<------><------><------><------> struct batadv_orig_node *orig_node,
<------><------><------><------> struct batadv_hard_iface *recv_if,
<------><------><------><------> struct batadv_neigh_node *neigh_node)
{
<------>struct batadv_orig_ifinfo *orig_ifinfo;
<------>struct batadv_neigh_node *curr_router;
<------>orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if);
<------>if (!orig_ifinfo)
<------><------>return;
<------>spin_lock_bh(&orig_node->neigh_list_lock);
<------>/* curr_router used earlier may not be the current orig_ifinfo->router
<------> * anymore because it was dereferenced outside of the neigh_list_lock
<------> * protected region. After the new best neighbor has replace the current
<------> * best neighbor the reference counter needs to decrease. Consequently,
<------> * the code needs to ensure the curr_router variable contains a pointer
<------> * to the replaced best neighbor.
<------> */
<------>/* increase refcount of new best neighbor */
<------>if (neigh_node)
<------><------>kref_get(&neigh_node->refcount);
<------>curr_router = rcu_replace_pointer(orig_ifinfo->router, neigh_node,
<------><------><------><------><------> true);
<------>spin_unlock_bh(&orig_node->neigh_list_lock);
<------>batadv_orig_ifinfo_put(orig_ifinfo);
<------>/* route deleted */
<------>if (curr_router && !neigh_node) {
<------><------>batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
<------><------><------> "Deleting route towards: %pM\n", orig_node->orig);
<------><------>batadv_tt_global_del_orig(bat_priv, orig_node, -1,
<------><------><------><------><------> "Deleted route towards originator");
<------>/* route added */
<------>} else if (!curr_router && neigh_node) {
<------><------>batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
<------><------><------> "Adding route towards: %pM (via %pM)\n",
<------><------><------> orig_node->orig, neigh_node->addr);
<------>/* route changed */
<------>} else if (neigh_node && curr_router) {
<------><------>batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
<------><------><------> "Changing route towards: %pM (now via %pM - was via %pM)\n",
<------><------><------> orig_node->orig, neigh_node->addr,
<------><------><------> curr_router->addr);
<------>}
<------>/* decrease refcount of previous best neighbor */
<------>if (curr_router)
<------><------>batadv_neigh_node_put(curr_router);
}
/**
* batadv_update_route() - set the router for this originator
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node which is to be configured
* @recv_if: the receive interface for which this route is set
* @neigh_node: neighbor which should be the next router
*/
void batadv_update_route(struct batadv_priv *bat_priv,
<------><------><------> struct batadv_orig_node *orig_node,
<------><------><------> struct batadv_hard_iface *recv_if,
<------><------><------> struct batadv_neigh_node *neigh_node)
{
<------>struct batadv_neigh_node *router = NULL;
<------>if (!orig_node)
<------><------>goto out;
<------>router = batadv_orig_router_get(orig_node, recv_if);
<------>if (router != neigh_node)
<------><------>_batadv_update_route(bat_priv, orig_node, recv_if, neigh_node);
out:
<------>if (router)
<------><------>batadv_neigh_node_put(router);
}
/**
* batadv_window_protected() - checks whether the host restarted and is in the
* protection time.
* @bat_priv: the bat priv with all the soft interface information
* @seq_num_diff: difference between the current/received sequence number and
* the last sequence number
* @seq_old_max_diff: maximum age of sequence number not considered as restart
* @last_reset: jiffies timestamp of the last reset, will be updated when reset
* is detected
* @protection_started: is set to true if the protection window was started,
* doesn't change otherwise.
*
* Return:
* false if the packet is to be accepted.
* true if the packet is to be ignored.
*/
bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
<------><------><------> s32 seq_old_max_diff, unsigned long *last_reset,
<------><------><------> bool *protection_started)
{
<------>if (seq_num_diff <= -seq_old_max_diff ||
<------> seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
<------><------>if (!batadv_has_timed_out(*last_reset,
<------><------><------><------><------> BATADV_RESET_PROTECTION_MS))
<------><------><------>return true;
<------><------>*last_reset = jiffies;
<------><------>if (protection_started)
<------><------><------>*protection_started = true;
<------><------>batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
<------><------><------> "old packet received, start protection\n");
<------>}
<------>return false;
}
/**
* batadv_check_management_packet() - Check preconditions for management packets
* @skb: incoming packet buffer
* @hard_iface: incoming hard interface
* @header_len: minimal header length of packet type
*
* Return: true when management preconditions are met, false otherwise
*/
bool batadv_check_management_packet(struct sk_buff *skb,
<------><------><------><------> struct batadv_hard_iface *hard_iface,
<------><------><------><------> int header_len)
{
<------>struct ethhdr *ethhdr;
<------>/* drop packet if it has not necessary minimum size */
<------>if (unlikely(!pskb_may_pull(skb, header_len)))
<------><------>return false;
<------>ethhdr = eth_hdr(skb);
<------>/* packet with broadcast indication but unicast recipient */
<------>if (!is_broadcast_ether_addr(ethhdr->h_dest))
<------><------>return false;
<------>/* packet with invalid sender address */
<------>if (!is_valid_ether_addr(ethhdr->h_source))
<------><------>return false;
<------>/* create a copy of the skb, if needed, to modify it. */
<------>if (skb_cow(skb, 0) < 0)
<------><------>return false;
<------>/* keep skb linear */
<------>if (skb_linearize(skb) < 0)
<------><------>return false;
<------>return true;
}
/**
* batadv_recv_my_icmp_packet() - receive an icmp packet locally
* @bat_priv: the bat priv with all the soft interface information
* @skb: icmp packet to process
*
* Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
* otherwise.
*/
static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
<------><------><------><------> struct sk_buff *skb)
{
<------>struct batadv_hard_iface *primary_if = NULL;
<------>struct batadv_orig_node *orig_node = NULL;
<------>struct batadv_icmp_header *icmph;
<------>int res, ret = NET_RX_DROP;
<------>icmph = (struct batadv_icmp_header *)skb->data;
<------>switch (icmph->msg_type) {
<------>case BATADV_ECHO_REPLY:
<------>case BATADV_DESTINATION_UNREACHABLE:
<------>case BATADV_TTL_EXCEEDED:
<------><------>/* receive the packet */
<------><------>if (skb_linearize(skb) < 0)
<------><------><------>break;
<------><------>batadv_socket_receive_packet(icmph, skb->len);
<------><------>break;
<------>case BATADV_ECHO_REQUEST:
<------><------>/* answer echo request (ping) */
<------><------>primary_if = batadv_primary_if_get_selected(bat_priv);
<------><------>if (!primary_if)
<------><------><------>goto out;
<------><------>/* get routing information */
<------><------>orig_node = batadv_orig_hash_find(bat_priv, icmph->orig);
<------><------>if (!orig_node)
<------><------><------>goto out;
<------><------>/* create a copy of the skb, if needed, to modify it. */
<------><------>if (skb_cow(skb, ETH_HLEN) < 0)
<------><------><------>goto out;
<------><------>icmph = (struct batadv_icmp_header *)skb->data;
<------><------>ether_addr_copy(icmph->dst, icmph->orig);
<------><------>ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr);
<------><------>icmph->msg_type = BATADV_ECHO_REPLY;
<------><------>icmph->ttl = BATADV_TTL;
<------><------>res = batadv_send_skb_to_orig(skb, orig_node, NULL);
<------><------>if (res == NET_XMIT_SUCCESS)
<------><------><------>ret = NET_RX_SUCCESS;
<------><------>/* skb was consumed */
<------><------>skb = NULL;
<------><------>break;
<------>case BATADV_TP:
<------><------>if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet)))
<------><------><------>goto out;
<------><------>batadv_tp_meter_recv(bat_priv, skb);
<------><------>ret = NET_RX_SUCCESS;
<------><------>/* skb was consumed */
<------><------>skb = NULL;
<------><------>goto out;
<------>default:
<------><------>/* drop unknown type */
<------><------>goto out;
<------>}
out:
<------>if (primary_if)
<------><------>batadv_hardif_put(primary_if);
<------>if (orig_node)
<------><------>batadv_orig_node_put(orig_node);
<------>kfree_skb(skb);
<------>return ret;
}
static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
<------><------><------><------><------> struct sk_buff *skb)
{
<------>struct batadv_hard_iface *primary_if = NULL;
<------>struct batadv_orig_node *orig_node = NULL;
<------>struct batadv_icmp_packet *icmp_packet;
<------>int res, ret = NET_RX_DROP;
<------>icmp_packet = (struct batadv_icmp_packet *)skb->data;
<------>/* send TTL exceeded if packet is an echo request (traceroute) */
<------>if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
<------><------>pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
<------><------><------> icmp_packet->orig, icmp_packet->dst);
<------><------>goto out;
<------>}
<------>primary_if = batadv_primary_if_get_selected(bat_priv);
<------>if (!primary_if)
<------><------>goto out;
<------>/* get routing information */
<------>orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
<------>if (!orig_node)
<------><------>goto out;
<------>/* create a copy of the skb, if needed, to modify it. */
<------>if (skb_cow(skb, ETH_HLEN) < 0)
<------><------>goto out;
<------>icmp_packet = (struct batadv_icmp_packet *)skb->data;
<------>ether_addr_copy(icmp_packet->dst, icmp_packet->orig);
<------>ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr);
<------>icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
<------>icmp_packet->ttl = BATADV_TTL;
<------>res = batadv_send_skb_to_orig(skb, orig_node, NULL);
<------>if (res == NET_RX_SUCCESS)
<------><------>ret = NET_XMIT_SUCCESS;
<------>/* skb was consumed */
<------>skb = NULL;
out:
<------>if (primary_if)
<------><------>batadv_hardif_put(primary_if);
<------>if (orig_node)
<------><------>batadv_orig_node_put(orig_node);
<------>kfree_skb(skb);
<------>return ret;
}
/**
* batadv_recv_icmp_packet() - Process incoming icmp packet
* @skb: incoming packet buffer
* @recv_if: incoming hard interface
*
* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
*/
int batadv_recv_icmp_packet(struct sk_buff *skb,
<------><------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
<------>struct batadv_icmp_header *icmph;
<------>struct batadv_icmp_packet_rr *icmp_packet_rr;
<------>struct ethhdr *ethhdr;
<------>struct batadv_orig_node *orig_node = NULL;
<------>int hdr_size = sizeof(struct batadv_icmp_header);
<------>int res, ret = NET_RX_DROP;
<------>/* drop packet if it has not necessary minimum size */
<------>if (unlikely(!pskb_may_pull(skb, hdr_size)))
<------><------>goto free_skb;
<------>ethhdr = eth_hdr(skb);
<------>/* packet with unicast indication but non-unicast recipient */
<------>if (!is_valid_ether_addr(ethhdr->h_dest))
<------><------>goto free_skb;
<------>/* packet with broadcast/multicast sender address */
<------>if (is_multicast_ether_addr(ethhdr->h_source))
<------><------>goto free_skb;
<------>/* not for me */
<------>if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
<------><------>goto free_skb;
<------>icmph = (struct batadv_icmp_header *)skb->data;
<------>/* add record route information if not full */
<------>if ((icmph->msg_type == BATADV_ECHO_REPLY ||
<------> icmph->msg_type == BATADV_ECHO_REQUEST) &&
<------> skb->len >= sizeof(struct batadv_icmp_packet_rr)) {
<------><------>if (skb_linearize(skb) < 0)
<------><------><------>goto free_skb;
<------><------>/* create a copy of the skb, if needed, to modify it. */
<------><------>if (skb_cow(skb, ETH_HLEN) < 0)
<------><------><------>goto free_skb;
<------><------>ethhdr = eth_hdr(skb);
<------><------>icmph = (struct batadv_icmp_header *)skb->data;
<------><------>icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
<------><------>if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
<------><------><------>goto free_skb;
<------><------>ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur],
<------><------><------><------>ethhdr->h_dest);
<------><------>icmp_packet_rr->rr_cur++;
<------>}
<------>/* packet for me */
<------>if (batadv_is_my_mac(bat_priv, icmph->dst))
<------><------>return batadv_recv_my_icmp_packet(bat_priv, skb);
<------>/* TTL exceeded */
<------>if (icmph->ttl < 2)
<------><------>return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
<------>/* get routing information */
<------>orig_node = batadv_orig_hash_find(bat_priv, icmph->dst);
<------>if (!orig_node)
<------><------>goto free_skb;
<------>/* create a copy of the skb, if needed, to modify it. */
<------>if (skb_cow(skb, ETH_HLEN) < 0)
<------><------>goto put_orig_node;
<------>icmph = (struct batadv_icmp_header *)skb->data;
<------>/* decrement ttl */
<------>icmph->ttl--;
<------>/* route it */
<------>res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
<------>if (res == NET_XMIT_SUCCESS)
<------><------>ret = NET_RX_SUCCESS;
<------>/* skb was consumed */
<------>skb = NULL;
put_orig_node:
<------>if (orig_node)
<------><------>batadv_orig_node_put(orig_node);
free_skb:
<------>kfree_skb(skb);
<------>return ret;
}
/**
* batadv_check_unicast_packet() - Check for malformed unicast packets
* @bat_priv: the bat priv with all the soft interface information
* @skb: packet to check
* @hdr_size: size of header to pull
*
* Checks for short header and bad addresses in the given packet.
*
* Return: 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 batadv_priv *bat_priv,
<------><------><------><------> 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 -ENODATA;
<------>ethhdr = eth_hdr(skb);
<------>/* packet with unicast indication but non-unicast recipient */
<------>if (!is_valid_ether_addr(ethhdr->h_dest))
<------><------>return -EBADR;
<------>/* packet with broadcast/multicast sender address */
<------>if (is_multicast_ether_addr(ethhdr->h_source))
<------><------>return -EBADR;
<------>/* not for me */
<------>if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
<------><------>return -EREMOTE;
<------>return 0;
}
/**
* batadv_last_bonding_get() - Get last_bonding_candidate of orig_node
* @orig_node: originator node whose last bonding candidate should be retrieved
*
* Return: last bonding candidate of router or NULL if not found
*
* The object is returned with refcounter increased by 1.
*/
static struct batadv_orig_ifinfo *
batadv_last_bonding_get(struct batadv_orig_node *orig_node)
{
<------>struct batadv_orig_ifinfo *last_bonding_candidate;
<------>spin_lock_bh(&orig_node->neigh_list_lock);
<------>last_bonding_candidate = orig_node->last_bonding_candidate;
<------>if (last_bonding_candidate)
<------><------>kref_get(&last_bonding_candidate->refcount);
<------>spin_unlock_bh(&orig_node->neigh_list_lock);
<------>return last_bonding_candidate;
}
/**
* batadv_last_bonding_replace() - Replace last_bonding_candidate of orig_node
* @orig_node: originator node whose bonding candidates should be replaced
* @new_candidate: new bonding candidate or NULL
*/
static void
batadv_last_bonding_replace(struct batadv_orig_node *orig_node,
<------><------><------> struct batadv_orig_ifinfo *new_candidate)
{
<------>struct batadv_orig_ifinfo *old_candidate;
<------>spin_lock_bh(&orig_node->neigh_list_lock);
<------>old_candidate = orig_node->last_bonding_candidate;
<------>if (new_candidate)
<------><------>kref_get(&new_candidate->refcount);
<------>orig_node->last_bonding_candidate = new_candidate;
<------>spin_unlock_bh(&orig_node->neigh_list_lock);
<------>if (old_candidate)
<------><------>batadv_orig_ifinfo_put(old_candidate);
}
/**
* batadv_find_router() - find a suitable router for this originator
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: the destination node
* @recv_if: pointer to interface this packet was received on
*
* Return: the router which should be used for this orig_node on
* this interface, or NULL if not available.
*/
struct batadv_neigh_node *
batadv_find_router(struct batadv_priv *bat_priv,
<------><------> struct batadv_orig_node *orig_node,
<------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_algo_ops *bao = bat_priv->algo_ops;
<------>struct batadv_neigh_node *first_candidate_router = NULL;
<------>struct batadv_neigh_node *next_candidate_router = NULL;
<------>struct batadv_neigh_node *router, *cand_router = NULL;
<------>struct batadv_neigh_node *last_cand_router = NULL;
<------>struct batadv_orig_ifinfo *cand, *first_candidate = NULL;
<------>struct batadv_orig_ifinfo *next_candidate = NULL;
<------>struct batadv_orig_ifinfo *last_candidate;
<------>bool last_candidate_found = false;
<------>if (!orig_node)
<------><------>return NULL;
<------>router = batadv_orig_router_get(orig_node, recv_if);
<------>if (!router)
<------><------>return router;
<------>/* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
<------> * and if activated.
<------> */
<------>if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding)))
<------><------>return router;
<------>/* bonding: loop through the list of possible routers found
<------> * for the various outgoing interfaces and find a candidate after
<------> * the last chosen bonding candidate (next_candidate). If no such
<------> * router is found, use the first candidate found (the previously
<------> * chosen bonding candidate might have been the last one in the list).
<------> * If this can't be found either, return the previously chosen
<------> * router - obviously there are no other candidates.
<------> */
<------>rcu_read_lock();
<------>last_candidate = batadv_last_bonding_get(orig_node);
<------>if (last_candidate)
<------><------>last_cand_router = rcu_dereference(last_candidate->router);
<------>hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
<------><------>/* acquire some structures and references ... */
<------><------>if (!kref_get_unless_zero(&cand->refcount))
<------><------><------>continue;
<------><------>cand_router = rcu_dereference(cand->router);
<------><------>if (!cand_router)
<------><------><------>goto next;
<------><------>if (!kref_get_unless_zero(&cand_router->refcount)) {
<------><------><------>cand_router = NULL;
<------><------><------>goto next;
<------><------>}
<------><------>/* alternative candidate should be good enough to be
<------><------> * considered
<------><------> */
<------><------>if (!bao->neigh.is_similar_or_better(cand_router,
<------><------><------><------><------><------> cand->if_outgoing, router,
<------><------><------><------><------><------> recv_if))
<------><------><------>goto next;
<------><------>/* don't use the same router twice */
<------><------>if (last_cand_router == cand_router)
<------><------><------>goto next;
<------><------>/* mark the first possible candidate */
<------><------>if (!first_candidate) {
<------><------><------>kref_get(&cand_router->refcount);
<------><------><------>kref_get(&cand->refcount);
<------><------><------>first_candidate = cand;
<------><------><------>first_candidate_router = cand_router;
<------><------>}
<------><------>/* check if the loop has already passed the previously selected
<------><------> * candidate ... this function should select the next candidate
<------><------> * AFTER the previously used bonding candidate.
<------><------> */
<------><------>if (!last_candidate || last_candidate_found) {
<------><------><------>next_candidate = cand;
<------><------><------>next_candidate_router = cand_router;
<------><------><------>break;
<------><------>}
<------><------>if (last_candidate == cand)
<------><------><------>last_candidate_found = true;
next:
<------><------>/* free references */
<------><------>if (cand_router) {
<------><------><------>batadv_neigh_node_put(cand_router);
<------><------><------>cand_router = NULL;
<------><------>}
<------><------>batadv_orig_ifinfo_put(cand);
<------>}
<------>rcu_read_unlock();
<------>/* After finding candidates, handle the three cases:
<------> * 1) there is a next candidate, use that
<------> * 2) there is no next candidate, use the first of the list
<------> * 3) there is no candidate at all, return the default router
<------> */
<------>if (next_candidate) {
<------><------>batadv_neigh_node_put(router);
<------><------>kref_get(&next_candidate_router->refcount);
<------><------>router = next_candidate_router;
<------><------>batadv_last_bonding_replace(orig_node, next_candidate);
<------>} else if (first_candidate) {
<------><------>batadv_neigh_node_put(router);
<------><------>kref_get(&first_candidate_router->refcount);
<------><------>router = first_candidate_router;
<------><------>batadv_last_bonding_replace(orig_node, first_candidate);
<------>} else {
<------><------>batadv_last_bonding_replace(orig_node, NULL);
<------>}
<------>/* cleanup of candidates */
<------>if (first_candidate) {
<------><------>batadv_neigh_node_put(first_candidate_router);
<------><------>batadv_orig_ifinfo_put(first_candidate);
<------>}
<------>if (next_candidate) {
<------><------>batadv_neigh_node_put(next_candidate_router);
<------><------>batadv_orig_ifinfo_put(next_candidate);
<------>}
<------>if (last_candidate)
<------><------>batadv_orig_ifinfo_put(last_candidate);
<------>return router;
}
static int batadv_route_unicast_packet(struct sk_buff *skb,
<------><------><------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
<------>struct batadv_orig_node *orig_node = NULL;
<------>struct batadv_unicast_packet *unicast_packet;
<------>struct ethhdr *ethhdr = eth_hdr(skb);
<------>int res, hdr_len, ret = NET_RX_DROP;
<------>unsigned int len;
<------>unicast_packet = (struct batadv_unicast_packet *)skb->data;
<------>/* TTL exceeded */
<------>if (unicast_packet->ttl < 2) {
<------><------>pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
<------><------><------> ethhdr->h_source, unicast_packet->dest);
<------><------>goto free_skb;
<------>}
<------>/* get routing information */
<------>orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
<------>if (!orig_node)
<------><------>goto free_skb;
<------>/* create a copy of the skb, if needed, to modify it. */
<------>if (skb_cow(skb, ETH_HLEN) < 0)
<------><------>goto put_orig_node;
<------>/* decrement ttl */
<------>unicast_packet = (struct batadv_unicast_packet *)skb->data;
<------>unicast_packet->ttl--;
<------>switch (unicast_packet->packet_type) {
<------>case BATADV_UNICAST_4ADDR:
<------><------>hdr_len = sizeof(struct batadv_unicast_4addr_packet);
<------><------>break;
<------>case BATADV_UNICAST:
<------><------>hdr_len = sizeof(struct batadv_unicast_packet);
<------><------>break;
<------>default:
<------><------>/* other packet types not supported - yet */
<------><------>hdr_len = -1;
<------><------>break;
<------>}
<------>if (hdr_len > 0)
<------><------>batadv_skb_set_priority(skb, hdr_len);
<------>len = skb->len;
<------>res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
<------>/* translate transmit result into receive result */
<------>if (res == NET_XMIT_SUCCESS) {
<------><------>ret = NET_RX_SUCCESS;
<------><------>/* skb was transmitted and consumed */
<------><------>batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
<------><------>batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
<------><------><------><------> len + ETH_HLEN);
<------>}
<------>/* skb was consumed */
<------>skb = NULL;
put_orig_node:
<------>batadv_orig_node_put(orig_node);
free_skb:
<------>kfree_skb(skb);
<------>return ret;
}
/**
* batadv_reroute_unicast_packet() - update the unicast header for re-routing
* @bat_priv: the bat priv with all the soft interface information
* @skb: unicast packet to process
* @unicast_packet: the unicast header to be updated
* @dst_addr: the payload destination
* @vid: VLAN identifier
*
* Search the translation table for dst_addr and update the unicast header with
* the new corresponding information (originator address where the destination
* client currently is and its known TTVN)
*
* Return: true if the packet header has been updated, false otherwise
*/
static bool
batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
<------><------><------> struct batadv_unicast_packet *unicast_packet,
<------><------><------> u8 *dst_addr, unsigned short vid)
{
<------>struct batadv_orig_node *orig_node = NULL;
<------>struct batadv_hard_iface *primary_if = NULL;
<------>bool ret = false;
<------>u8 *orig_addr, orig_ttvn;
<------>if (batadv_is_my_client(bat_priv, dst_addr, vid)) {
<------><------>primary_if = batadv_primary_if_get_selected(bat_priv);
<------><------>if (!primary_if)
<------><------><------>goto out;
<------><------>orig_addr = primary_if->net_dev->dev_addr;
<------><------>orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
<------>} else {
<------><------>orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr,
<------><------><------><------><------><------> vid);
<------><------>if (!orig_node)
<------><------><------>goto out;
<------><------>if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
<------><------><------>goto out;
<------><------>orig_addr = orig_node->orig;
<------><------>orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
<------>}
<------>/* update the packet header */
<------>skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet));
<------>ether_addr_copy(unicast_packet->dest, orig_addr);
<------>unicast_packet->ttvn = orig_ttvn;
<------>skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet));
<------>ret = true;
out:
<------>if (primary_if)
<------><------>batadv_hardif_put(primary_if);
<------>if (orig_node)
<------><------>batadv_orig_node_put(orig_node);
<------>return ret;
}
static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
<------><------><------><------> struct sk_buff *skb, int hdr_len)
{
<------>struct batadv_unicast_packet *unicast_packet;
<------>struct batadv_hard_iface *primary_if;
<------>struct batadv_orig_node *orig_node;
<------>u8 curr_ttvn, old_ttvn;
<------>struct ethhdr *ethhdr;
<------>unsigned short vid;
<------>int is_old_ttvn;
<------>/* check if there is enough data before accessing it */
<------>if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
<------><------>return false;
<------>/* create a copy of the skb (in case of for re-routing) to modify it. */
<------>if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
<------><------>return false;
<------>unicast_packet = (struct batadv_unicast_packet *)skb->data;
<------>vid = batadv_get_vid(skb, hdr_len);
<------>ethhdr = (struct ethhdr *)(skb->data + hdr_len);
<------>/* do not reroute multicast frames in a unicast header */
<------>if (is_multicast_ether_addr(ethhdr->h_dest))
<------><------>return true;
<------>/* check if the destination client was served by this node and it is now
<------> * roaming. In this case, it means that the node has got a ROAM_ADV
<------> * message and that it knows the new destination in the mesh to re-route
<------> * the packet to
<------> */
<------>if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) {
<------><------>if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet,
<------><------><------><------><------><------> ethhdr->h_dest, vid))
<------><------><------>batadv_dbg_ratelimited(BATADV_DBG_TT,
<------><------><------><------><------> bat_priv,
<------><------><------><------><------> "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
<------><------><------><------><------> unicast_packet->dest,
<------><------><------><------><------> ethhdr->h_dest);
<------><------>/* at this point the mesh destination should have been
<------><------> * substituted with the originator address found in the global
<------><------> * table. If not, let the packet go untouched anyway because
<------><------> * there is nothing the node can do
<------><------> */
<------><------>return true;
<------>}
<------>/* retrieve the TTVN known by this node for the packet destination. This
<------> * value is used later to check if the node which sent (or re-routed
<------> * last time) the packet had an updated information or not
<------> */
<------>curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
<------>if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
<------><------>orig_node = batadv_orig_hash_find(bat_priv,
<------><------><------><------><------><------> unicast_packet->dest);
<------><------>/* if it is not possible to find the orig_node representing the
<------><------> * destination, the packet can immediately be dropped as it will
<------><------> * not be possible to deliver it
<------><------> */
<------><------>if (!orig_node)
<------><------><------>return false;
<------><------>curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
<------><------>batadv_orig_node_put(orig_node);
<------>}
<------>/* check if the TTVN contained in the packet is fresher than what the
<------> * node knows
<------> */
<------>is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
<------>if (!is_old_ttvn)
<------><------>return true;
<------>old_ttvn = unicast_packet->ttvn;
<------>/* the packet was forged based on outdated network information. Its
<------> * destination can possibly be updated and forwarded towards the new
<------> * target host
<------> */
<------>if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet,
<------><------><------><------><------> ethhdr->h_dest, vid)) {
<------><------>batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv,
<------><------><------><------> "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
<------><------><------><------> unicast_packet->dest, ethhdr->h_dest,
<------><------><------><------> old_ttvn, curr_ttvn);
<------><------>return true;
<------>}
<------>/* the packet has not been re-routed: either the destination is
<------> * currently served by this node or there is no destination at all and
<------> * it is possible to drop the packet
<------> */
<------>if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
<------><------>return false;
<------>/* update the header in order to let the packet be delivered to this
<------> * node's soft interface
<------> */
<------>primary_if = batadv_primary_if_get_selected(bat_priv);
<------>if (!primary_if)
<------><------>return false;
<------>/* update the packet header */
<------>skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet));
<------>ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
<------>unicast_packet->ttvn = curr_ttvn;
<------>skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet));
<------>batadv_hardif_put(primary_if);
<------>return true;
}
/**
* batadv_recv_unhandled_unicast_packet() - receive and process packets which
* are in the unicast number space but not yet known to the implementation
* @skb: unicast tvlv packet to process
* @recv_if: pointer to interface this packet was received on
*
* Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
* otherwise.
*/
int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
<------><------><------><------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_unicast_packet *unicast_packet;
<------>struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
<------>int check, hdr_size = sizeof(*unicast_packet);
<------>check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
<------>if (check < 0)
<------><------>goto free_skb;
<------>/* we don't know about this type, drop it. */
<------>unicast_packet = (struct batadv_unicast_packet *)skb->data;
<------>if (batadv_is_my_mac(bat_priv, unicast_packet->dest))
<------><------>goto free_skb;
<------>return batadv_route_unicast_packet(skb, recv_if);
free_skb:
<------>kfree_skb(skb);
<------>return NET_RX_DROP;
}
/**
* batadv_recv_unicast_packet() - Process incoming unicast packet
* @skb: incoming packet buffer
* @recv_if: incoming hard interface
*
* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
*/
int batadv_recv_unicast_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_unicast_4addr_packet *unicast_4addr_packet;
<------>u8 *orig_addr, *orig_addr_gw;
<------>struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL;
<------>int check, hdr_size = sizeof(*unicast_packet);
<------>enum batadv_subtype subtype;
<------>int ret = NET_RX_DROP;
<------>bool is4addr, is_gw;
<------>unicast_packet = (struct batadv_unicast_packet *)skb->data;
<------>is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
<------>/* the caller function should have already pulled 2 bytes */
<------>if (is4addr)
<------><------>hdr_size = sizeof(*unicast_4addr_packet);
<------>/* function returns -EREMOTE for promiscuous packets */
<------>check = batadv_check_unicast_packet(bat_priv, 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)
<------><------>goto free_skb;
<------>if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
<------><------>goto free_skb;
<------>unicast_packet = (struct batadv_unicast_packet *)skb->data;
<------>/* packet for me */
<------>if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
<------><------>/* If this is a unicast packet from another backgone gw,
<------><------> * drop it.
<------><------> */
<------><------>orig_addr_gw = eth_hdr(skb)->h_source;
<------><------>orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw);
<------><------>if (orig_node_gw) {
<------><------><------>is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw,
<------><------><------><------><------><------><------> hdr_size);
<------><------><------>batadv_orig_node_put(orig_node_gw);
<------><------><------>if (is_gw) {
<------><------><------><------>batadv_dbg(BATADV_DBG_BLA, bat_priv,
<------><------><------><------><------> "%s(): Dropped unicast pkt received from another backbone gw %pM.\n",
<------><------><------><------><------> __func__, orig_addr_gw);
<------><------><------><------>goto free_skb;
<------><------><------>}
<------><------>}
<------><------>if (is4addr) {
<------><------><------>unicast_4addr_packet =
<------><------><------><------>(struct batadv_unicast_4addr_packet *)skb->data;
<------><------><------>subtype = unicast_4addr_packet->subtype;
<------><------><------>batadv_dat_inc_counter(bat_priv, subtype);
<------><------><------>/* Only payload data should be considered for speedy
<------><------><------> * join. For example, DAT also uses unicast 4addr
<------><------><------> * types, but those packets should not be considered
<------><------><------> * for speedy join, since the clients do not actually
<------><------><------> * reside at the sending originator.
<------><------><------> */
<------><------><------>if (subtype == BATADV_P_DATA) {
<------><------><------><------>orig_addr = unicast_4addr_packet->src;
<------><------><------><------>orig_node = batadv_orig_hash_find(bat_priv,
<------><------><------><------><------><------><------><------> orig_addr);
<------><------><------>}
<------><------>}
<------><------>if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
<------><------><------><------><------><------><------> hdr_size))
<------><------><------>goto rx_success;
<------><------>if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
<------><------><------><------><------><------><------>hdr_size))
<------><------><------>goto rx_success;
<------><------>batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size);
<------><------>batadv_interface_rx(recv_if->soft_iface, skb, hdr_size,
<------><------><------><------> orig_node);
rx_success:
<------><------>if (orig_node)
<------><------><------>batadv_orig_node_put(orig_node);
<------><------>return NET_RX_SUCCESS;
<------>}
<------>ret = batadv_route_unicast_packet(skb, recv_if);
<------>/* skb was consumed */
<------>skb = NULL;
free_skb:
<------>kfree_skb(skb);
<------>return ret;
}
/**
* batadv_recv_unicast_tvlv() - receive and process unicast tvlv packets
* @skb: unicast tvlv packet to process
* @recv_if: pointer to interface this packet was received on
*
* Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
* otherwise.
*/
int batadv_recv_unicast_tvlv(struct sk_buff *skb,
<------><------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
<------>struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
<------>unsigned char *tvlv_buff;
<------>u16 tvlv_buff_len;
<------>int hdr_size = sizeof(*unicast_tvlv_packet);
<------>int ret = NET_RX_DROP;
<------>if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
<------><------>goto free_skb;
<------>/* the header is likely to be modified while forwarding */
<------>if (skb_cow(skb, hdr_size) < 0)
<------><------>goto free_skb;
<------>/* packet needs to be linearized to access the tvlv content */
<------>if (skb_linearize(skb) < 0)
<------><------>goto free_skb;
<------>unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data;
<------>tvlv_buff = (unsigned char *)(skb->data + hdr_size);
<------>tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len);
<------>if (tvlv_buff_len > skb->len - hdr_size)
<------><------>goto free_skb;
<------>ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
<------><------><------><------><------> unicast_tvlv_packet->src,
<------><------><------><------><------> unicast_tvlv_packet->dst,
<------><------><------><------><------> tvlv_buff, tvlv_buff_len);
<------>if (ret != NET_RX_SUCCESS) {
<------><------>ret = batadv_route_unicast_packet(skb, recv_if);
<------><------>/* skb was consumed */
<------><------>skb = NULL;
<------>}
free_skb:
<------>kfree_skb(skb);
<------>return ret;
}
/**
* batadv_recv_frag_packet() - process received fragment
* @skb: the received fragment
* @recv_if: interface that the skb is received on
*
* This function does one of the three following things: 1) Forward fragment, if
* the assembled packet will exceed our MTU; 2) Buffer fragment, if we still
* lack further fragments; 3) Merge fragments, if we have all needed parts.
*
* Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
*/
int batadv_recv_frag_packet(struct sk_buff *skb,
<------><------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
<------>struct batadv_orig_node *orig_node_src = NULL;
<------>struct batadv_frag_packet *frag_packet;
<------>int ret = NET_RX_DROP;
<------>if (batadv_check_unicast_packet(bat_priv, skb,
<------><------><------><------><------>sizeof(*frag_packet)) < 0)
<------><------>goto free_skb;
<------>frag_packet = (struct batadv_frag_packet *)skb->data;
<------>orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
<------>if (!orig_node_src)
<------><------>goto free_skb;
<------>skb->priority = frag_packet->priority + 256;
<------>/* Route the fragment if it is not for us and too big to be merged. */
<------>if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
<------> batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
<------><------>/* skb was consumed */
<------><------>skb = NULL;
<------><------>ret = NET_RX_SUCCESS;
<------><------>goto put_orig_node;
<------>}
<------>batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
<------>batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
<------>/* Add fragment to buffer and merge if possible. */
<------>if (!batadv_frag_skb_buffer(&skb, orig_node_src))
<------><------>goto put_orig_node;
<------>/* Deliver merged packet to the appropriate handler, if it was
<------> * merged
<------> */
<------>if (skb) {
<------><------>batadv_batman_skb_recv(skb, recv_if->net_dev,
<------><------><------><------> &recv_if->batman_adv_ptype, NULL);
<------><------>/* skb was consumed */
<------><------>skb = NULL;
<------>}
<------>ret = NET_RX_SUCCESS;
put_orig_node:
<------>batadv_orig_node_put(orig_node_src);
free_skb:
<------>kfree_skb(skb);
<------>return ret;
}
/**
* batadv_recv_bcast_packet() - Process incoming broadcast packet
* @skb: incoming packet buffer
* @recv_if: incoming hard interface
*
* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
*/
int batadv_recv_bcast_packet(struct sk_buff *skb,
<------><------><------> struct batadv_hard_iface *recv_if)
{
<------>struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
<------>struct batadv_orig_node *orig_node = NULL;
<------>struct batadv_bcast_packet *bcast_packet;
<------>struct ethhdr *ethhdr;
<------>int hdr_size = sizeof(*bcast_packet);
<------>int ret = NET_RX_DROP;
<------>s32 seq_diff;
<------>u32 seqno;
<------>/* drop packet if it has not necessary minimum size */
<------>if (unlikely(!pskb_may_pull(skb, hdr_size)))
<------><------>goto free_skb;
<------>ethhdr = eth_hdr(skb);
<------>/* packet with broadcast indication but unicast recipient */
<------>if (!is_broadcast_ether_addr(ethhdr->h_dest))
<------><------>goto free_skb;
<------>/* packet with broadcast/multicast sender address */
<------>if (is_multicast_ether_addr(ethhdr->h_source))
<------><------>goto free_skb;
<------>/* ignore broadcasts sent by myself */
<------>if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
<------><------>goto free_skb;
<------>bcast_packet = (struct batadv_bcast_packet *)skb->data;
<------>/* ignore broadcasts originated by myself */
<------>if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
<------><------>goto free_skb;
<------>if (bcast_packet->ttl < 2)
<------><------>goto free_skb;
<------>orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
<------>if (!orig_node)
<------><------>goto free_skb;
<------>spin_lock_bh(&orig_node->bcast_seqno_lock);
<------>seqno = ntohl(bcast_packet->seqno);
<------>/* check whether the packet is a duplicate */
<------>if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
<------><------><------> seqno))
<------><------>goto spin_unlock;
<------>seq_diff = seqno - orig_node->last_bcast_seqno;
<------>/* check whether the packet is old and the host just restarted. */
<------>if (batadv_window_protected(bat_priv, seq_diff,
<------><------><------><------> BATADV_BCAST_MAX_AGE,
<------><------><------><------> &orig_node->bcast_seqno_reset, NULL))
<------><------>goto spin_unlock;
<------>/* mark broadcast in flood history, update window position
<------> * if required.
<------> */
<------>if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
<------><------>orig_node->last_bcast_seqno = seqno;
<------>spin_unlock_bh(&orig_node->bcast_seqno_lock);
<------>/* check whether this has been sent by another originator before */
<------>if (batadv_bla_check_bcast_duplist(bat_priv, skb))
<------><------>goto free_skb;
<------>batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
<------>/* rebroadcast packet */
<------>batadv_add_bcast_packet_to_list(bat_priv, skb, 1, false);
<------>/* don't hand the broadcast up if it is from an originator
<------> * from the same backbone.
<------> */
<------>if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
<------><------>goto free_skb;
<------>if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size))
<------><------>goto rx_success;
<------>if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
<------><------>goto rx_success;
<------>batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size);
<------>/* broadcast for me */
<------>batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node);
rx_success:
<------>ret = NET_RX_SUCCESS;
<------>goto out;
spin_unlock:
<------>spin_unlock_bh(&orig_node->bcast_seqno_lock);
free_skb:
<------>kfree_skb(skb);
out:
<------>if (orig_node)
<------><------>batadv_orig_node_put(orig_node);
<------>return ret;
}