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batman-adv: Adjust name for batadv_dat_send_data

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The send functions in batman-adv are expected to consume the skb when
either the data is queued up for the underlying driver or when some
precondition failed. batadv_dat_send_data didn't do this and instead
created a copy of the skb, modified it and queued the copy up for
transmission. The caller has to take care that the skb is handled correctly
(for example free'd) when batadv_dat_send_data returns.

This unclear behavior already lead to memory leaks in the recent past.
Renaming the function to batadv_dat_forward_data should make it easier to
identify that the data is forwarded but the skb is not actually
send+consumed.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2019-03-17 10:50:50 +01:00 committed by Simon Wunderlich
parent cedb0dbbb2
commit c2d8b9a6c1
1 changed files with 14 additions and 10 deletions
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24
net/batman-adv/distributed-arp-table.c
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@ -655,7 +655,7 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst,
}
/**
* batadv_dat_send_data() - send a payload to the selected candidates
* batadv_dat_forward_data() - copy and send payload to the selected candidates
* @bat_priv: the bat priv with all the soft interface information
* @skb: payload to send
* @ip: the DHT key
@ -668,9 +668,9 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst,
* Return: true if the packet is sent to at least one candidate, false
* otherwise.
*/
static bool batadv_dat_send_data(struct batadv_priv *bat_priv,
struct sk_buff *skb, __be32 ip,
unsigned short vid, int packet_subtype)
static bool batadv_dat_forward_data(struct batadv_priv *bat_priv,
struct sk_buff *skb, __be32 ip,
unsigned short vid, int packet_subtype)
{
int i;
bool ret = false;
@ -1265,8 +1265,8 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
ret = true;
} else {
/* Send the request to the DHT */
ret = batadv_dat_send_data(bat_priv, skb, ip_dst, vid,
BATADV_P_DAT_DHT_GET);
ret = batadv_dat_forward_data(bat_priv, skb, ip_dst, vid,
BATADV_P_DAT_DHT_GET);
}
out:
if (dat_entry)
@ -1380,8 +1380,10 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
/* Send the ARP reply to the candidates for both the IP addresses that
* the node obtained from the ARP reply
*/
batadv_dat_send_data(bat_priv, skb, ip_src, vid, BATADV_P_DAT_DHT_PUT);
batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_PUT);
batadv_dat_forward_data(bat_priv, skb, ip_src, vid,
BATADV_P_DAT_DHT_PUT);
batadv_dat_forward_data(bat_priv, skb, ip_dst, vid,
BATADV_P_DAT_DHT_PUT);
}
/**
@ -1696,8 +1698,10 @@ static void batadv_dat_put_dhcp(struct batadv_priv *bat_priv, u8 *chaddr,
batadv_dat_entry_add(bat_priv, yiaddr, chaddr, vid);
batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid);
batadv_dat_send_data(bat_priv, skb, yiaddr, vid, BATADV_P_DAT_DHT_PUT);
batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_PUT);
batadv_dat_forward_data(bat_priv, skb, yiaddr, vid,
BATADV_P_DAT_DHT_PUT);
batadv_dat_forward_data(bat_priv, skb, ip_dst, vid,
BATADV_P_DAT_DHT_PUT);
consume_skb(skb);