batadv_check_unicast_packet() is changed to return a value based on the reason to drop the packet, which will be useful information for future users of batadv_check_unicast_packet(). Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Acked-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
1285 lines
35 KiB
C
1285 lines
35 KiB
C
/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
|
|
*
|
|
* Marek Lindner, Simon Wunderlich
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA
|
|
*/
|
|
|
|
#include "main.h"
|
|
#include "routing.h"
|
|
#include "send.h"
|
|
#include "soft-interface.h"
|
|
#include "hard-interface.h"
|
|
#include "icmp_socket.h"
|
|
#include "translation-table.h"
|
|
#include "originator.h"
|
|
#include "vis.h"
|
|
#include "unicast.h"
|
|
#include "bridge_loop_avoidance.h"
|
|
#include "distributed-arp-table.h"
|
|
|
|
static int batadv_route_unicast_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if);
|
|
|
|
void batadv_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct hlist_head *head;
|
|
struct batadv_orig_node *orig_node;
|
|
unsigned long *word;
|
|
uint32_t i;
|
|
size_t word_index;
|
|
uint8_t *w;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
|
spin_lock_bh(&orig_node->ogm_cnt_lock);
|
|
word_index = hard_iface->if_num * BATADV_NUM_WORDS;
|
|
word = &(orig_node->bcast_own[word_index]);
|
|
|
|
batadv_bit_get_packet(bat_priv, word, 1, 0);
|
|
w = &orig_node->bcast_own_sum[hard_iface->if_num];
|
|
*w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
|
|
spin_unlock_bh(&orig_node->ogm_cnt_lock);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static void _batadv_update_route(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_neigh_node *neigh_node)
|
|
{
|
|
struct batadv_neigh_node *curr_router;
|
|
|
|
curr_router = batadv_orig_node_get_router(orig_node);
|
|
|
|
/* 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,
|
|
"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);
|
|
}
|
|
|
|
if (curr_router)
|
|
batadv_neigh_node_free_ref(curr_router);
|
|
|
|
/* increase refcount of new best neighbor */
|
|
if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
|
|
neigh_node = NULL;
|
|
|
|
spin_lock_bh(&orig_node->neigh_list_lock);
|
|
rcu_assign_pointer(orig_node->router, neigh_node);
|
|
spin_unlock_bh(&orig_node->neigh_list_lock);
|
|
|
|
/* decrease refcount of previous best neighbor */
|
|
if (curr_router)
|
|
batadv_neigh_node_free_ref(curr_router);
|
|
}
|
|
|
|
void batadv_update_route(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_neigh_node *neigh_node)
|
|
{
|
|
struct batadv_neigh_node *router = NULL;
|
|
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
|
|
if (router != neigh_node)
|
|
_batadv_update_route(bat_priv, orig_node, neigh_node);
|
|
|
|
out:
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
}
|
|
|
|
/* caller must hold the neigh_list_lock */
|
|
void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node,
|
|
struct batadv_neigh_node *neigh_node)
|
|
{
|
|
/* this neighbor is not part of our candidate list */
|
|
if (list_empty(&neigh_node->bonding_list))
|
|
goto out;
|
|
|
|
list_del_rcu(&neigh_node->bonding_list);
|
|
INIT_LIST_HEAD(&neigh_node->bonding_list);
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
atomic_dec(&orig_node->bond_candidates);
|
|
|
|
out:
|
|
return;
|
|
}
|
|
|
|
void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node,
|
|
struct batadv_neigh_node *neigh_node)
|
|
{
|
|
struct batadv_neigh_node *tmp_neigh_node, *router = NULL;
|
|
uint8_t interference_candidate = 0;
|
|
|
|
spin_lock_bh(&orig_node->neigh_list_lock);
|
|
|
|
/* only consider if it has the same primary address ... */
|
|
if (!batadv_compare_eth(orig_node->orig,
|
|
neigh_node->orig_node->primary_addr))
|
|
goto candidate_del;
|
|
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (!router)
|
|
goto candidate_del;
|
|
|
|
/* ... and is good enough to be considered */
|
|
if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD)
|
|
goto candidate_del;
|
|
|
|
/* check if we have another candidate with the same mac address or
|
|
* interface. If we do, we won't select this candidate because of
|
|
* possible interference.
|
|
*/
|
|
hlist_for_each_entry_rcu(tmp_neigh_node,
|
|
&orig_node->neigh_list, list) {
|
|
if (tmp_neigh_node == neigh_node)
|
|
continue;
|
|
|
|
/* we only care if the other candidate is even
|
|
* considered as candidate.
|
|
*/
|
|
if (list_empty(&tmp_neigh_node->bonding_list))
|
|
continue;
|
|
|
|
if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
|
|
(batadv_compare_eth(neigh_node->addr,
|
|
tmp_neigh_node->addr))) {
|
|
interference_candidate = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* don't care further if it is an interference candidate */
|
|
if (interference_candidate)
|
|
goto candidate_del;
|
|
|
|
/* this neighbor already is part of our candidate list */
|
|
if (!list_empty(&neigh_node->bonding_list))
|
|
goto out;
|
|
|
|
if (!atomic_inc_not_zero(&neigh_node->refcount))
|
|
goto out;
|
|
|
|
list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
|
|
atomic_inc(&orig_node->bond_candidates);
|
|
goto out;
|
|
|
|
candidate_del:
|
|
batadv_bonding_candidate_del(orig_node, neigh_node);
|
|
|
|
out:
|
|
spin_unlock_bh(&orig_node->neigh_list_lock);
|
|
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
}
|
|
|
|
/* copy primary address for bonding */
|
|
void
|
|
batadv_bonding_save_primary(const struct batadv_orig_node *orig_node,
|
|
struct batadv_orig_node *orig_neigh_node,
|
|
const struct batadv_ogm_packet *batman_ogm_packet)
|
|
{
|
|
if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
|
|
return;
|
|
|
|
memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
|
|
}
|
|
|
|
/* checks whether the host restarted and is in the protection time.
|
|
* returns:
|
|
* 0 if the packet is to be accepted
|
|
* 1 if the packet is to be ignored.
|
|
*/
|
|
int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff,
|
|
unsigned long *last_reset)
|
|
{
|
|
if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
|
|
seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
|
|
if (!batadv_has_timed_out(*last_reset,
|
|
BATADV_RESET_PROTECTION_MS))
|
|
return 1;
|
|
|
|
*last_reset = jiffies;
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"old packet received, start protection\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
/* packet with broadcast indication but unicast recipient */
|
|
if (!is_broadcast_ether_addr(ethhdr->h_dest))
|
|
return false;
|
|
|
|
/* packet with broadcast sender address */
|
|
if (is_broadcast_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;
|
|
}
|
|
|
|
static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb, size_t icmp_len)
|
|
{
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_icmp_packet_rr *icmp_packet;
|
|
int ret = NET_RX_DROP;
|
|
|
|
icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
|
|
|
|
/* add data to device queue */
|
|
if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
|
|
batadv_socket_receive_packet(icmp_packet, icmp_len);
|
|
goto out;
|
|
}
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
/* answer echo request (ping) */
|
|
/* 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_rr *)skb->data;
|
|
|
|
memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
|
|
memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
icmp_packet->msg_type = BATADV_ECHO_REPLY;
|
|
icmp_packet->header.ttl = BATADV_TTL;
|
|
|
|
if (batadv_send_skb_to_orig(skb, orig_node, NULL))
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
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 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;
|
|
|
|
memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
|
|
memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
|
|
icmp_packet->header.ttl = BATADV_TTL;
|
|
|
|
if (batadv_send_skb_to_orig(skb, orig_node, NULL))
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return ret;
|
|
}
|
|
|
|
|
|
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_packet_rr *icmp_packet;
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
int hdr_size = sizeof(struct batadv_icmp_packet);
|
|
int ret = NET_RX_DROP;
|
|
|
|
/* we truncate all incoming icmp packets if they don't match our size */
|
|
if (skb->len >= sizeof(struct batadv_icmp_packet_rr))
|
|
hdr_size = sizeof(struct batadv_icmp_packet_rr);
|
|
|
|
/* drop packet if it has not necessary minimum size */
|
|
if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
|
goto out;
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
/* packet with unicast indication but broadcast recipient */
|
|
if (is_broadcast_ether_addr(ethhdr->h_dest))
|
|
goto out;
|
|
|
|
/* packet with broadcast sender address */
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
|
goto out;
|
|
|
|
/* not for me */
|
|
if (!batadv_is_my_mac(ethhdr->h_dest))
|
|
goto out;
|
|
|
|
icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
|
|
|
|
/* add record route information if not full */
|
|
if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
|
|
(icmp_packet->rr_cur < BATADV_RR_LEN)) {
|
|
memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
|
|
ethhdr->h_dest, ETH_ALEN);
|
|
icmp_packet->rr_cur++;
|
|
}
|
|
|
|
/* packet for me */
|
|
if (batadv_is_my_mac(icmp_packet->dst))
|
|
return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size);
|
|
|
|
/* TTL exceeded */
|
|
if (icmp_packet->header.ttl < 2)
|
|
return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
|
|
|
|
/* get routing information */
|
|
orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
|
|
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_rr *)skb->data;
|
|
|
|
/* decrement ttl */
|
|
icmp_packet->header.ttl--;
|
|
|
|
/* route it */
|
|
if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return ret;
|
|
}
|
|
|
|
/* In the bonding case, send the packets in a round
|
|
* robin fashion over the remaining interfaces.
|
|
*
|
|
* This method rotates the bonding list and increases the
|
|
* returned router's refcount.
|
|
*/
|
|
static struct batadv_neigh_node *
|
|
batadv_find_bond_router(struct batadv_orig_node *primary_orig,
|
|
const struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_neigh_node *tmp_neigh_node;
|
|
struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
|
|
bonding_list) {
|
|
if (!first_candidate)
|
|
first_candidate = tmp_neigh_node;
|
|
|
|
/* recv_if == NULL on the first node. */
|
|
if (tmp_neigh_node->if_incoming == recv_if)
|
|
continue;
|
|
|
|
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
|
|
continue;
|
|
|
|
router = tmp_neigh_node;
|
|
break;
|
|
}
|
|
|
|
/* use the first candidate if nothing was found. */
|
|
if (!router && first_candidate &&
|
|
atomic_inc_not_zero(&first_candidate->refcount))
|
|
router = first_candidate;
|
|
|
|
if (!router)
|
|
goto out;
|
|
|
|
/* selected should point to the next element
|
|
* after the current router
|
|
*/
|
|
spin_lock_bh(&primary_orig->neigh_list_lock);
|
|
/* this is a list_move(), which unfortunately
|
|
* does not exist as rcu version
|
|
*/
|
|
list_del_rcu(&primary_orig->bond_list);
|
|
list_add_rcu(&primary_orig->bond_list,
|
|
&router->bonding_list);
|
|
spin_unlock_bh(&primary_orig->neigh_list_lock);
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return router;
|
|
}
|
|
|
|
/* Interface Alternating: Use the best of the
|
|
* remaining candidates which are not using
|
|
* this interface.
|
|
*
|
|
* Increases the returned router's refcount
|
|
*/
|
|
static struct batadv_neigh_node *
|
|
batadv_find_ifalter_router(struct batadv_orig_node *primary_orig,
|
|
const struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_neigh_node *tmp_neigh_node;
|
|
struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
|
|
bonding_list) {
|
|
if (!first_candidate)
|
|
first_candidate = tmp_neigh_node;
|
|
|
|
/* recv_if == NULL on the first node. */
|
|
if (tmp_neigh_node->if_incoming == recv_if)
|
|
continue;
|
|
|
|
if (router && tmp_neigh_node->tq_avg <= router->tq_avg)
|
|
continue;
|
|
|
|
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
|
|
continue;
|
|
|
|
/* decrement refcount of previously selected router */
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
|
|
/* we found a better router (or at least one valid router) */
|
|
router = tmp_neigh_node;
|
|
}
|
|
|
|
/* use the first candidate if nothing was found. */
|
|
if (!router && first_candidate &&
|
|
atomic_inc_not_zero(&first_candidate->refcount))
|
|
router = first_candidate;
|
|
|
|
rcu_read_unlock();
|
|
return router;
|
|
}
|
|
|
|
/**
|
|
* batadv_check_unicast_packet - Check for malformed unicast packets
|
|
* @skb: packet to check
|
|
* @hdr_size: size of header to pull
|
|
*
|
|
* Check for short header and bad addresses in given packet. Returns negative
|
|
* value when check fails and 0 otherwise. The negative value depends on the
|
|
* reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
|
|
* and -EREMOTE for non-local (other host) destination.
|
|
*/
|
|
static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
|
|
/* drop packet if it has not necessary minimum size */
|
|
if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
|
return -ENODATA;
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
/* packet with unicast indication but broadcast recipient */
|
|
if (is_broadcast_ether_addr(ethhdr->h_dest))
|
|
return -EBADR;
|
|
|
|
/* packet with broadcast sender address */
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
|
return -EBADR;
|
|
|
|
/* not for me */
|
|
if (!batadv_is_my_mac(ethhdr->h_dest))
|
|
return -EREMOTE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_tt_query_packet *tt_query;
|
|
uint16_t tt_size;
|
|
int hdr_size = sizeof(*tt_query);
|
|
char tt_flag;
|
|
size_t packet_size;
|
|
|
|
if (batadv_check_unicast_packet(skb, hdr_size) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
/* I could need to modify it */
|
|
if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0)
|
|
goto out;
|
|
|
|
tt_query = (struct batadv_tt_query_packet *)skb->data;
|
|
|
|
switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) {
|
|
case BATADV_TT_REQUEST:
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
|
|
|
|
/* If we cannot provide an answer the tt_request is
|
|
* forwarded
|
|
*/
|
|
if (!batadv_send_tt_response(bat_priv, tt_query)) {
|
|
if (tt_query->flags & BATADV_TT_FULL_TABLE)
|
|
tt_flag = 'F';
|
|
else
|
|
tt_flag = '.';
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Routing TT_REQUEST to %pM [%c]\n",
|
|
tt_query->dst,
|
|
tt_flag);
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
}
|
|
break;
|
|
case BATADV_TT_RESPONSE:
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
|
|
|
|
if (batadv_is_my_mac(tt_query->dst)) {
|
|
/* packet needs to be linearized to access the TT
|
|
* changes
|
|
*/
|
|
if (skb_linearize(skb) < 0)
|
|
goto out;
|
|
/* skb_linearize() possibly changed skb->data */
|
|
tt_query = (struct batadv_tt_query_packet *)skb->data;
|
|
|
|
tt_size = batadv_tt_len(ntohs(tt_query->tt_data));
|
|
|
|
/* Ensure we have all the claimed data */
|
|
packet_size = sizeof(struct batadv_tt_query_packet);
|
|
packet_size += tt_size;
|
|
if (unlikely(skb_headlen(skb) < packet_size))
|
|
goto out;
|
|
|
|
batadv_handle_tt_response(bat_priv, tt_query);
|
|
} else {
|
|
if (tt_query->flags & BATADV_TT_FULL_TABLE)
|
|
tt_flag = 'F';
|
|
else
|
|
tt_flag = '.';
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Routing TT_RESPONSE to %pM [%c]\n",
|
|
tt_query->dst,
|
|
tt_flag);
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
}
|
|
break;
|
|
}
|
|
|
|
out:
|
|
/* returning NET_RX_DROP will make the caller function kfree the skb */
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
struct batadv_roam_adv_packet *roam_adv_packet;
|
|
struct batadv_orig_node *orig_node;
|
|
|
|
if (batadv_check_unicast_packet(skb, sizeof(*roam_adv_packet)) < 0)
|
|
goto out;
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
|
|
|
|
roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data;
|
|
|
|
if (!batadv_is_my_mac(roam_adv_packet->dst))
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
|
|
/* check if it is a backbone gateway. we don't accept
|
|
* roaming advertisement from it, as it has the same
|
|
* entries as we have.
|
|
*/
|
|
if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src))
|
|
goto out;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Received ROAMING_ADV from %pM (client %pM)\n",
|
|
roam_adv_packet->src, roam_adv_packet->client);
|
|
|
|
batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
|
|
BATADV_TT_CLIENT_ROAM,
|
|
atomic_read(&orig_node->last_ttvn) + 1);
|
|
|
|
batadv_orig_node_free_ref(orig_node);
|
|
out:
|
|
/* returning NET_RX_DROP will make the caller function kfree the skb */
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/* find a suitable router for this originator, and use
|
|
* bonding if possible. increases the found neighbors
|
|
* refcount.
|
|
*/
|
|
struct batadv_neigh_node *
|
|
batadv_find_router(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_orig_node *primary_orig_node;
|
|
struct batadv_orig_node *router_orig;
|
|
struct batadv_neigh_node *router;
|
|
static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
|
|
int bonding_enabled;
|
|
uint8_t *primary_addr;
|
|
|
|
if (!orig_node)
|
|
return NULL;
|
|
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (!router)
|
|
goto err;
|
|
|
|
/* without bonding, the first node should
|
|
* always choose the default router.
|
|
*/
|
|
bonding_enabled = atomic_read(&bat_priv->bonding);
|
|
|
|
rcu_read_lock();
|
|
/* select default router to output */
|
|
router_orig = router->orig_node;
|
|
if (!router_orig)
|
|
goto err_unlock;
|
|
|
|
if ((!recv_if) && (!bonding_enabled))
|
|
goto return_router;
|
|
|
|
primary_addr = router_orig->primary_addr;
|
|
|
|
/* if we have something in the primary_addr, we can search
|
|
* for a potential bonding candidate.
|
|
*/
|
|
if (batadv_compare_eth(primary_addr, zero_mac))
|
|
goto return_router;
|
|
|
|
/* find the orig_node which has the primary interface. might
|
|
* even be the same as our router_orig in many cases
|
|
*/
|
|
if (batadv_compare_eth(primary_addr, router_orig->orig)) {
|
|
primary_orig_node = router_orig;
|
|
} else {
|
|
primary_orig_node = batadv_orig_hash_find(bat_priv,
|
|
primary_addr);
|
|
if (!primary_orig_node)
|
|
goto return_router;
|
|
|
|
batadv_orig_node_free_ref(primary_orig_node);
|
|
}
|
|
|
|
/* with less than 2 candidates, we can't do any
|
|
* bonding and prefer the original router.
|
|
*/
|
|
if (atomic_read(&primary_orig_node->bond_candidates) < 2)
|
|
goto return_router;
|
|
|
|
/* all nodes between should choose a candidate which
|
|
* is is not on the interface where the packet came
|
|
* in.
|
|
*/
|
|
batadv_neigh_node_free_ref(router);
|
|
|
|
if (bonding_enabled)
|
|
router = batadv_find_bond_router(primary_orig_node, recv_if);
|
|
else
|
|
router = batadv_find_ifalter_router(primary_orig_node, recv_if);
|
|
|
|
return_router:
|
|
if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE)
|
|
goto err_unlock;
|
|
|
|
rcu_read_unlock();
|
|
return router;
|
|
err_unlock:
|
|
rcu_read_unlock();
|
|
err:
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
return NULL;
|
|
}
|
|
|
|
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_neigh_node *neigh_node = NULL;
|
|
struct batadv_unicast_packet *unicast_packet;
|
|
struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
int ret = NET_RX_DROP;
|
|
struct sk_buff *new_skb;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
|
|
/* TTL exceeded */
|
|
if (unicast_packet->header.ttl < 2) {
|
|
pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
|
|
ethhdr->h_source, unicast_packet->dest);
|
|
goto out;
|
|
}
|
|
|
|
/* get routing information */
|
|
orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
|
|
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
/* find_router() increases neigh_nodes refcount if found. */
|
|
neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
|
|
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
/* create a copy of the skb, if needed, to modify it. */
|
|
if (skb_cow(skb, ETH_HLEN) < 0)
|
|
goto out;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
|
|
if (unicast_packet->header.packet_type == BATADV_UNICAST &&
|
|
atomic_read(&bat_priv->fragmentation) &&
|
|
skb->len > neigh_node->if_incoming->net_dev->mtu) {
|
|
ret = batadv_frag_send_skb(skb, bat_priv,
|
|
neigh_node->if_incoming,
|
|
neigh_node->addr);
|
|
goto out;
|
|
}
|
|
|
|
if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG &&
|
|
batadv_frag_can_reassemble(skb,
|
|
neigh_node->if_incoming->net_dev->mtu)) {
|
|
ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
|
|
|
|
if (ret == NET_RX_DROP)
|
|
goto out;
|
|
|
|
/* packet was buffered for late merge */
|
|
if (!new_skb) {
|
|
ret = NET_RX_SUCCESS;
|
|
goto out;
|
|
}
|
|
|
|
skb = new_skb;
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
}
|
|
|
|
/* decrement ttl */
|
|
unicast_packet->header.ttl--;
|
|
|
|
/* Update stats counter */
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
|
|
skb->len + ETH_HLEN);
|
|
|
|
/* route it */
|
|
if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
out:
|
|
if (neigh_node)
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_reroute_unicast_packet - update the unicast header for re-routing
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @unicast_packet: the unicast header to be updated
|
|
* @dst_addr: the payload destination
|
|
*
|
|
* 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)
|
|
*
|
|
* Returns true if the packet header has been updated, false otherwise
|
|
*/
|
|
static bool
|
|
batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
|
|
struct batadv_unicast_packet *unicast_packet,
|
|
uint8_t *dst_addr)
|
|
{
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
bool ret = false;
|
|
uint8_t *orig_addr, orig_ttvn;
|
|
|
|
if (batadv_is_my_client(bat_priv, dst_addr)) {
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
orig_addr = primary_if->net_dev->dev_addr;
|
|
orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
|
|
} else {
|
|
orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
|
|
goto out;
|
|
|
|
orig_addr = orig_node->orig;
|
|
orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
|
|
}
|
|
|
|
/* update the packet header */
|
|
memcpy(unicast_packet->dest, orig_addr, ETH_ALEN);
|
|
unicast_packet->ttvn = orig_ttvn;
|
|
|
|
ret = true;
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb) {
|
|
uint8_t curr_ttvn, old_ttvn;
|
|
struct batadv_orig_node *orig_node;
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct batadv_unicast_packet *unicast_packet;
|
|
int is_old_ttvn;
|
|
|
|
/* check if there is enough data before accessing it */
|
|
if (pskb_may_pull(skb, sizeof(*unicast_packet) + ETH_HLEN) < 0)
|
|
return 0;
|
|
|
|
/* create a copy of the skb (in case of for re-routing) to modify it. */
|
|
if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
|
|
return 0;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
ethhdr = (struct ethhdr *)(skb->data + sizeof(*unicast_packet));
|
|
|
|
/* 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)) {
|
|
if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
|
|
ethhdr->h_dest))
|
|
net_ratelimited_function(batadv_dbg, 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 1;
|
|
}
|
|
|
|
/* 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 = (uint8_t)atomic_read(&bat_priv->tt.vn);
|
|
if (!batadv_is_my_mac(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 0;
|
|
|
|
curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
|
|
batadv_orig_node_free_ref(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 1;
|
|
|
|
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, unicast_packet,
|
|
ethhdr->h_dest)) {
|
|
net_ratelimited_function(batadv_dbg, 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 1;
|
|
}
|
|
|
|
/* 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))
|
|
return 0;
|
|
|
|
/* 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 0;
|
|
|
|
memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
|
|
batadv_hardif_free_ref(primary_if);
|
|
|
|
unicast_packet->ttvn = curr_ttvn;
|
|
|
|
return 1;
|
|
}
|
|
|
|
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;
|
|
uint8_t *orig_addr;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
int hdr_size = sizeof(*unicast_packet);
|
|
bool is4addr;
|
|
|
|
unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
|
|
|
|
is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR;
|
|
/* the caller function should have already pulled 2 bytes */
|
|
if (is4addr)
|
|
hdr_size = sizeof(*unicast_4addr_packet);
|
|
|
|
if (batadv_check_unicast_packet(skb, hdr_size) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
if (!batadv_check_unicast_ttvn(bat_priv, skb))
|
|
return NET_RX_DROP;
|
|
|
|
/* packet for me */
|
|
if (batadv_is_my_mac(unicast_packet->dest)) {
|
|
if (is4addr) {
|
|
batadv_dat_inc_counter(bat_priv,
|
|
unicast_4addr_packet->subtype);
|
|
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_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
|
|
orig_node);
|
|
|
|
rx_success:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
}
|
|
|
|
int batadv_recv_ucast_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_unicast_frag_packet *unicast_packet;
|
|
int hdr_size = sizeof(*unicast_packet);
|
|
struct sk_buff *new_skb = NULL;
|
|
int ret;
|
|
|
|
if (batadv_check_unicast_packet(skb, hdr_size) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
if (!batadv_check_unicast_ttvn(bat_priv, skb))
|
|
return NET_RX_DROP;
|
|
|
|
unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
|
|
|
|
/* packet for me */
|
|
if (batadv_is_my_mac(unicast_packet->dest)) {
|
|
ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
|
|
|
|
if (ret == NET_RX_DROP)
|
|
return NET_RX_DROP;
|
|
|
|
/* packet was buffered for late merge */
|
|
if (!new_skb)
|
|
return NET_RX_SUCCESS;
|
|
|
|
if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb,
|
|
hdr_size))
|
|
goto rx_success;
|
|
if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb,
|
|
hdr_size))
|
|
goto rx_success;
|
|
|
|
batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if,
|
|
sizeof(struct batadv_unicast_packet), NULL);
|
|
|
|
rx_success:
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
return batadv_route_unicast_packet(skb, recv_if);
|
|
}
|
|
|
|
|
|
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;
|
|
int32_t seq_diff;
|
|
|
|
/* drop packet if it has not necessary minimum size */
|
|
if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
|
goto out;
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
/* packet with broadcast indication but unicast recipient */
|
|
if (!is_broadcast_ether_addr(ethhdr->h_dest))
|
|
goto out;
|
|
|
|
/* packet with broadcast sender address */
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
|
goto out;
|
|
|
|
/* ignore broadcasts sent by myself */
|
|
if (batadv_is_my_mac(ethhdr->h_source))
|
|
goto out;
|
|
|
|
bcast_packet = (struct batadv_bcast_packet *)skb->data;
|
|
|
|
/* ignore broadcasts originated by myself */
|
|
if (batadv_is_my_mac(bcast_packet->orig))
|
|
goto out;
|
|
|
|
if (bcast_packet->header.ttl < 2)
|
|
goto out;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
|
|
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
spin_lock_bh(&orig_node->bcast_seqno_lock);
|
|
|
|
/* check whether the packet is a duplicate */
|
|
if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
|
|
ntohl(bcast_packet->seqno)))
|
|
goto spin_unlock;
|
|
|
|
seq_diff = ntohl(bcast_packet->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,
|
|
&orig_node->bcast_seqno_reset))
|
|
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 = ntohl(bcast_packet->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 out;
|
|
|
|
/* rebroadcast packet */
|
|
batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
|
|
|
|
/* 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 out;
|
|
|
|
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;
|
|
|
|
/* broadcast for me */
|
|
batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
|
|
orig_node);
|
|
|
|
rx_success:
|
|
ret = NET_RX_SUCCESS;
|
|
goto out;
|
|
|
|
spin_unlock:
|
|
spin_unlock_bh(&orig_node->bcast_seqno_lock);
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return ret;
|
|
}
|
|
|
|
int batadv_recv_vis_packet(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if)
|
|
{
|
|
struct batadv_vis_packet *vis_packet;
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
|
|
int hdr_size = sizeof(*vis_packet);
|
|
|
|
/* keep skb linear */
|
|
if (skb_linearize(skb) < 0)
|
|
return NET_RX_DROP;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, hdr_size)))
|
|
return NET_RX_DROP;
|
|
|
|
vis_packet = (struct batadv_vis_packet *)skb->data;
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
/* not for me */
|
|
if (!batadv_is_my_mac(ethhdr->h_dest))
|
|
return NET_RX_DROP;
|
|
|
|
/* ignore own packets */
|
|
if (batadv_is_my_mac(vis_packet->vis_orig))
|
|
return NET_RX_DROP;
|
|
|
|
if (batadv_is_my_mac(vis_packet->sender_orig))
|
|
return NET_RX_DROP;
|
|
|
|
switch (vis_packet->vis_type) {
|
|
case BATADV_VIS_TYPE_SERVER_SYNC:
|
|
batadv_receive_server_sync_packet(bat_priv, vis_packet,
|
|
skb_headlen(skb));
|
|
break;
|
|
|
|
case BATADV_VIS_TYPE_CLIENT_UPDATE:
|
|
batadv_receive_client_update_packet(bat_priv, vis_packet,
|
|
skb_headlen(skb));
|
|
break;
|
|
|
|
default: /* ignore unknown packet */
|
|
break;
|
|
}
|
|
|
|
/* We take a copy of the data in the packet, so we should
|
|
* always free the skbuf.
|
|
*/
|
|
return NET_RX_DROP;
|
|
}
|