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batman-adv: use consume_skb for non-dropped packets 

kfree_skb assumes that an skb is dropped after an failure and notes that.
consume_skb should be used in non-failure situations. Such information is
important for dropmonitor netlink which tells how many packets were dropped
and where this drop happened.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2016-07-17 21:04:00 +02:00 committed by Simon Wunderlich
parent 3111beed0d
commit bd687fe419
6 changed files with 59 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/batman-adv/bat_iv_ogm.c
View File

@ -698,7 +698,7 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
if (!forw_packet_aggr->skb) {
batadv_forw_packet_free(forw_packet_aggr);
batadv_forw_packet_free(forw_packet_aggr, true);
return;
}
@ -1611,7 +1611,7 @@ batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
if (hardif_neigh)
batadv_hardif_neigh_put(hardif_neigh);
kfree_skb(skb_priv);
consume_skb(skb_priv);
}
/**
@ -1783,6 +1783,7 @@ static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
struct delayed_work *delayed_work;
struct batadv_forw_packet *forw_packet;
struct batadv_priv *bat_priv;
bool dropped = false;
delayed_work = to_delayed_work(work);
forw_packet = container_of(delayed_work, struct batadv_forw_packet,
@ -1792,8 +1793,10 @@ static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
hlist_del(&forw_packet->list);
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
dropped = true;
goto out;
}
batadv_iv_ogm_emit(forw_packet);
@ -1810,7 +1813,7 @@ static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
batadv_iv_ogm_schedule(forw_packet->if_incoming);
out:
batadv_forw_packet_free(forw_packet);
batadv_forw_packet_free(forw_packet, dropped);
}
static int batadv_iv_ogm_receive(struct sk_buff *skb,
@ -1851,7 +1854,7 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb,
ogm_packet = (struct batadv_ogm_packet *)packet_pos;
}
kfree_skb(skb);
consume_skb(skb);
return NET_RX_SUCCESS;
}

20
net/batman-adv/fragmentation.c
View File

@ -42,17 +42,23 @@
/**
* batadv_frag_clear_chain - delete entries in the fragment buffer chain
* @head: head of chain with entries.
* @dropped: whether the chain is cleared because all fragments are dropped
*
* Free fragments in the passed hlist. Should be called with appropriate lock.
*/
static void batadv_frag_clear_chain(struct hlist_head *head)
static void batadv_frag_clear_chain(struct hlist_head *head, bool dropped)
{
struct batadv_frag_list_entry *entry;
struct hlist_node *node;
hlist_for_each_entry_safe(entry, node, head, list) {
hlist_del(&entry->list);
kfree_skb(entry->skb);
if (dropped)
kfree_skb(entry->skb);
else
consume_skb(entry->skb);
kfree(entry);
}
}
@ -73,7 +79,7 @@ void batadv_frag_purge_orig(struct batadv_orig_node *orig_node,
spin_lock_bh(&chain->lock);
if (!check_cb || check_cb(chain)) {
batadv_frag_clear_chain(&chain->fragment_list);
batadv_frag_clear_chain(&chain->fragment_list, true);
chain->size = 0;
}
@ -118,7 +124,7 @@ static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain,
return false;
if (!hlist_empty(&chain->fragment_list))
batadv_frag_clear_chain(&chain->fragment_list);
batadv_frag_clear_chain(&chain->fragment_list, true);
chain->size = 0;
chain->seqno = seqno;
@ -220,7 +226,7 @@ static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node,
* exceeds the maximum size of one merged packet. Don't allow
* packets to have different total_size.
*/
batadv_frag_clear_chain(&chain->fragment_list);
batadv_frag_clear_chain(&chain->fragment_list, true);
chain->size = 0;
} else if (ntohs(frag_packet->total_size) == chain->size) {
/* All fragments received. Hand over chain to caller. */
@ -254,6 +260,7 @@ batadv_frag_merge_packets(struct hlist_head *chain)
struct batadv_frag_list_entry *entry;
struct sk_buff *skb_out;
int size, hdr_size = sizeof(struct batadv_frag_packet);
bool dropped = false;
/* Remove first entry, as this is the destination for the rest of the
* fragments.
@ -270,6 +277,7 @@ batadv_frag_merge_packets(struct hlist_head *chain)
if (pskb_expand_head(skb_out, 0, size - skb_out->len, GFP_ATOMIC) < 0) {
kfree_skb(skb_out);
skb_out = NULL;
dropped = true;
goto free;
}
@ -291,7 +299,7 @@ batadv_frag_merge_packets(struct hlist_head *chain)
free:
/* Locking is not needed, because 'chain' is not part of any orig. */
batadv_frag_clear_chain(chain);
batadv_frag_clear_chain(chain, dropped);
return skb_out;
}

24
net/batman-adv/network-coding.c
View File

@ -260,10 +260,16 @@ static void batadv_nc_path_put(struct batadv_nc_path *nc_path)
/**
* batadv_nc_packet_free - frees nc packet
* @nc_packet: the nc packet to free
* @dropped: whether the packet is freed because is is dropped
*/
static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet)
static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet,
bool dropped)
{
kfree_skb(nc_packet->skb);
if (dropped)
kfree_skb(nc_packet->skb);
else
consume_skb(nc_packet->skb);
batadv_nc_path_put(nc_packet->nc_path);
kfree(nc_packet);
}
@ -576,7 +582,7 @@ static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet)
{
batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node);
nc_packet->skb = NULL;
batadv_nc_packet_free(nc_packet);
batadv_nc_packet_free(nc_packet, false);
}
/**
@ -610,7 +616,7 @@ static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv,
/* purge nc packet */
list_del(&nc_packet->list);
batadv_nc_packet_free(nc_packet);
batadv_nc_packet_free(nc_packet, true);
res = true;
@ -1208,11 +1214,11 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv,
}
/* skb_src is now coded into skb_dest, so free it */
kfree_skb(skb_src);
consume_skb(skb_src);
/* avoid duplicate free of skb from nc_packet */
nc_packet->skb = NULL;
batadv_nc_packet_free(nc_packet);
batadv_nc_packet_free(nc_packet, false);
/* Send the coded packet and return true */
batadv_send_unicast_skb(skb_dest, first_dest);
@ -1399,7 +1405,7 @@ static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv,
/* batadv_nc_skb_store_for_decoding() clones the skb, so we must free
* our ref
*/
kfree_skb(skb);
consume_skb(skb);
}
/**
@ -1723,7 +1729,7 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
ether_addr_copy(unicast_packet->dest, orig_dest);
unicast_packet->ttvn = ttvn;
batadv_nc_packet_free(nc_packet);
batadv_nc_packet_free(nc_packet, false);
return unicast_packet;
}
@ -1860,7 +1866,7 @@ static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
return batadv_recv_unicast_packet(skb, recv_if);
free_nc_packet:
batadv_nc_packet_free(nc_packet);
batadv_nc_packet_free(nc_packet, true);
return NET_RX_DROP;
}

27
net/batman-adv/send.c
View File

@ -451,13 +451,19 @@ int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
/**
* batadv_forw_packet_free - free a forwarding packet
* @forw_packet: The packet to free
* @dropped: whether the packet is freed because is is dropped
*
* This frees a forwarding packet and releases any resources it might
* have claimed.
*/
void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet,
bool dropped)
{
kfree_skb(forw_packet->skb);
if (dropped)
kfree_skb(forw_packet->skb);
else
consume_skb(forw_packet->skb);
if (forw_packet->if_incoming)
batadv_hardif_put(forw_packet->if_incoming);
if (forw_packet->if_outgoing)
@ -598,7 +604,7 @@ int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
return NETDEV_TX_OK;
err_packet_free:
batadv_forw_packet_free(forw_packet);
batadv_forw_packet_free(forw_packet, true);
err:
return NETDEV_TX_BUSY;
}
@ -613,6 +619,7 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
struct sk_buff *skb1;
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
bool dropped = false;
u8 *neigh_addr;
u8 *orig_neigh;
int ret = 0;
@ -627,11 +634,15 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
hlist_del(&forw_packet->list);
spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
dropped = true;
goto out;
}
if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) {
dropped = true;
goto out;
}
bcast_packet = (struct batadv_bcast_packet *)forw_packet->skb->data;
@ -709,7 +720,7 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
}
out:
batadv_forw_packet_free(forw_packet);
batadv_forw_packet_free(forw_packet, dropped);
}
void
@ -750,7 +761,7 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
if (pending) {
hlist_del(&forw_packet->list);
batadv_forw_packet_free(forw_packet);
batadv_forw_packet_free(forw_packet, true);
}
}
spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
@ -777,7 +788,7 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
if (pending) {
hlist_del(&forw_packet->list);
batadv_forw_packet_free(forw_packet);
batadv_forw_packet_free(forw_packet, true);
}
}
spin_unlock_bh(&bat_priv->forw_bat_list_lock);

3
net/batman-adv/send.h
View File

@ -27,7 +27,8 @@
struct sk_buff;
void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet);
void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet,
bool dropped);
struct batadv_forw_packet *
batadv_forw_packet_alloc(struct batadv_hard_iface *if_incoming,
struct batadv_hard_iface *if_outgoing,

2
net/batman-adv/soft-interface.c
View File

@ -362,7 +362,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
/* a copy is stored in the bcast list, therefore removing
* the original skb.
*/
kfree_skb(skb);
consume_skb(skb);
/* unicast packet */
} else {